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. | |
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) { | |
8e87d142 | 133 | if (rfcomm_pi(sk)->channel == channel && |
1da177e4 LT |
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 | ||
1b8d7ae4 | 285 | static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) |
1da177e4 LT |
286 | { |
287 | struct rfcomm_dlc *d; | |
288 | struct sock *sk; | |
289 | ||
1b8d7ae4 | 290 | sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto, 1); |
1da177e4 LT |
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 | ||
1b8d7ae4 | 326 | static int rfcomm_sock_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
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 | ||
1b8d7ae4 | 339 | sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC); |
74da626a | 340 | if (!sk) |
1da177e4 LT |
341 | return -ENOMEM; |
342 | ||
343 | rfcomm_sock_init(sk, NULL); | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len) | |
348 | { | |
349 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
350 | struct sock *sk = sock->sk; | |
351 | int err = 0; | |
352 | ||
353 | BT_DBG("sk %p %s", sk, batostr(&sa->rc_bdaddr)); | |
354 | ||
355 | if (!addr || addr->sa_family != AF_BLUETOOTH) | |
356 | return -EINVAL; | |
357 | ||
358 | lock_sock(sk); | |
359 | ||
360 | if (sk->sk_state != BT_OPEN) { | |
361 | err = -EBADFD; | |
362 | goto done; | |
363 | } | |
364 | ||
354d28d5 MH |
365 | if (sk->sk_type != SOCK_STREAM) { |
366 | err = -EINVAL; | |
367 | goto done; | |
368 | } | |
369 | ||
1da177e4 LT |
370 | write_lock_bh(&rfcomm_sk_list.lock); |
371 | ||
372 | if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) { | |
373 | err = -EADDRINUSE; | |
374 | } else { | |
375 | /* Save source address */ | |
376 | bacpy(&bt_sk(sk)->src, &sa->rc_bdaddr); | |
377 | rfcomm_pi(sk)->channel = sa->rc_channel; | |
378 | sk->sk_state = BT_BOUND; | |
379 | } | |
380 | ||
381 | write_unlock_bh(&rfcomm_sk_list.lock); | |
382 | ||
383 | done: | |
384 | release_sock(sk); | |
385 | return err; | |
386 | } | |
387 | ||
388 | static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) | |
389 | { | |
390 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
391 | struct sock *sk = sock->sk; | |
392 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
393 | int err = 0; | |
394 | ||
395 | BT_DBG("sk %p", sk); | |
396 | ||
397 | if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_rc)) | |
398 | return -EINVAL; | |
399 | ||
354d28d5 | 400 | lock_sock(sk); |
1da177e4 | 401 | |
354d28d5 MH |
402 | if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) { |
403 | err = -EBADFD; | |
404 | goto done; | |
405 | } | |
1da177e4 | 406 | |
354d28d5 MH |
407 | if (sk->sk_type != SOCK_STREAM) { |
408 | err = -EINVAL; | |
409 | goto done; | |
410 | } | |
1da177e4 LT |
411 | |
412 | sk->sk_state = BT_CONNECT; | |
413 | bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr); | |
414 | rfcomm_pi(sk)->channel = sa->rc_channel; | |
415 | ||
416 | err = rfcomm_dlc_open(d, &bt_sk(sk)->src, &sa->rc_bdaddr, sa->rc_channel); | |
417 | if (!err) | |
418 | err = bt_sock_wait_state(sk, BT_CONNECTED, | |
419 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
420 | ||
354d28d5 | 421 | done: |
1da177e4 LT |
422 | release_sock(sk); |
423 | return err; | |
424 | } | |
425 | ||
426 | static int rfcomm_sock_listen(struct socket *sock, int backlog) | |
427 | { | |
428 | struct sock *sk = sock->sk; | |
429 | int err = 0; | |
430 | ||
431 | BT_DBG("sk %p backlog %d", sk, backlog); | |
432 | ||
433 | lock_sock(sk); | |
434 | ||
435 | if (sk->sk_state != BT_BOUND) { | |
436 | err = -EBADFD; | |
437 | goto done; | |
438 | } | |
439 | ||
354d28d5 MH |
440 | if (sk->sk_type != SOCK_STREAM) { |
441 | err = -EINVAL; | |
442 | goto done; | |
443 | } | |
444 | ||
1da177e4 LT |
445 | if (!rfcomm_pi(sk)->channel) { |
446 | bdaddr_t *src = &bt_sk(sk)->src; | |
447 | u8 channel; | |
448 | ||
449 | err = -EINVAL; | |
450 | ||
451 | write_lock_bh(&rfcomm_sk_list.lock); | |
452 | ||
453 | for (channel = 1; channel < 31; channel++) | |
454 | if (!__rfcomm_get_sock_by_addr(channel, src)) { | |
455 | rfcomm_pi(sk)->channel = channel; | |
456 | err = 0; | |
457 | break; | |
458 | } | |
459 | ||
460 | write_unlock_bh(&rfcomm_sk_list.lock); | |
461 | ||
462 | if (err < 0) | |
463 | goto done; | |
464 | } | |
465 | ||
466 | sk->sk_max_ack_backlog = backlog; | |
467 | sk->sk_ack_backlog = 0; | |
468 | sk->sk_state = BT_LISTEN; | |
469 | ||
470 | done: | |
471 | release_sock(sk); | |
472 | return err; | |
473 | } | |
474 | ||
475 | static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags) | |
476 | { | |
477 | DECLARE_WAITQUEUE(wait, current); | |
478 | struct sock *sk = sock->sk, *nsk; | |
479 | long timeo; | |
480 | int err = 0; | |
481 | ||
482 | lock_sock(sk); | |
483 | ||
484 | if (sk->sk_state != BT_LISTEN) { | |
485 | err = -EBADFD; | |
486 | goto done; | |
487 | } | |
488 | ||
354d28d5 MH |
489 | if (sk->sk_type != SOCK_STREAM) { |
490 | err = -EINVAL; | |
491 | goto done; | |
492 | } | |
493 | ||
1da177e4 LT |
494 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
495 | ||
496 | BT_DBG("sk %p timeo %ld", sk, timeo); | |
497 | ||
498 | /* Wait for an incoming connection. (wake-one). */ | |
499 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
500 | while (!(nsk = bt_accept_dequeue(sk, newsock))) { | |
501 | set_current_state(TASK_INTERRUPTIBLE); | |
502 | if (!timeo) { | |
503 | err = -EAGAIN; | |
504 | break; | |
505 | } | |
506 | ||
507 | release_sock(sk); | |
508 | timeo = schedule_timeout(timeo); | |
509 | lock_sock(sk); | |
510 | ||
511 | if (sk->sk_state != BT_LISTEN) { | |
512 | err = -EBADFD; | |
513 | break; | |
514 | } | |
515 | ||
516 | if (signal_pending(current)) { | |
517 | err = sock_intr_errno(timeo); | |
518 | break; | |
519 | } | |
520 | } | |
521 | set_current_state(TASK_RUNNING); | |
522 | remove_wait_queue(sk->sk_sleep, &wait); | |
523 | ||
524 | if (err) | |
525 | goto done; | |
526 | ||
527 | newsock->state = SS_CONNECTED; | |
528 | ||
529 | BT_DBG("new socket %p", nsk); | |
530 | ||
531 | done: | |
532 | release_sock(sk); | |
533 | return err; | |
534 | } | |
535 | ||
536 | static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) | |
537 | { | |
538 | struct sockaddr_rc *sa = (struct sockaddr_rc *) addr; | |
539 | struct sock *sk = sock->sk; | |
540 | ||
541 | BT_DBG("sock %p, sk %p", sock, sk); | |
542 | ||
543 | sa->rc_family = AF_BLUETOOTH; | |
544 | sa->rc_channel = rfcomm_pi(sk)->channel; | |
545 | if (peer) | |
546 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->dst); | |
547 | else | |
548 | bacpy(&sa->rc_bdaddr, &bt_sk(sk)->src); | |
549 | ||
550 | *len = sizeof(struct sockaddr_rc); | |
551 | return 0; | |
552 | } | |
553 | ||
554 | static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock, | |
555 | struct msghdr *msg, size_t len) | |
556 | { | |
557 | struct sock *sk = sock->sk; | |
558 | struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc; | |
559 | struct sk_buff *skb; | |
1da177e4 LT |
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); | |
4d6a2188 | 574 | int err; |
8e87d142 | 575 | |
1da177e4 LT |
576 | skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE, |
577 | msg->msg_flags & MSG_DONTWAIT, &err); | |
578 | if (!skb) | |
579 | break; | |
580 | skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE); | |
581 | ||
582 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); | |
583 | if (err) { | |
584 | kfree_skb(skb); | |
4d6a2188 MH |
585 | if (sent == 0) |
586 | sent = err; | |
1da177e4 LT |
587 | break; |
588 | } | |
589 | ||
590 | err = rfcomm_dlc_send(d, skb); | |
591 | if (err < 0) { | |
592 | kfree_skb(skb); | |
4d6a2188 MH |
593 | if (sent == 0) |
594 | sent = err; | |
1da177e4 LT |
595 | break; |
596 | } | |
597 | ||
598 | sent += size; | |
599 | len -= size; | |
600 | } | |
601 | ||
602 | release_sock(sk); | |
603 | ||
4d6a2188 | 604 | return sent; |
1da177e4 LT |
605 | } |
606 | ||
607 | static long rfcomm_sock_data_wait(struct sock *sk, long timeo) | |
608 | { | |
609 | DECLARE_WAITQUEUE(wait, current); | |
610 | ||
611 | add_wait_queue(sk->sk_sleep, &wait); | |
612 | for (;;) { | |
613 | set_current_state(TASK_INTERRUPTIBLE); | |
614 | ||
b03efcfb DM |
615 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
616 | sk->sk_err || | |
617 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
618 | signal_pending(current) || | |
619 | !timeo) | |
1da177e4 LT |
620 | break; |
621 | ||
622 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
623 | release_sock(sk); | |
624 | timeo = schedule_timeout(timeo); | |
625 | lock_sock(sk); | |
626 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
627 | } | |
628 | ||
629 | __set_current_state(TASK_RUNNING); | |
630 | remove_wait_queue(sk->sk_sleep, &wait); | |
631 | return timeo; | |
632 | } | |
633 | ||
634 | static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock, | |
635 | struct msghdr *msg, size_t size, int flags) | |
636 | { | |
637 | struct sock *sk = sock->sk; | |
638 | int err = 0; | |
639 | size_t target, copied = 0; | |
640 | long timeo; | |
641 | ||
642 | if (flags & MSG_OOB) | |
643 | return -EOPNOTSUPP; | |
644 | ||
645 | msg->msg_namelen = 0; | |
646 | ||
647 | BT_DBG("sk %p size %d", sk, size); | |
648 | ||
649 | lock_sock(sk); | |
650 | ||
651 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, size); | |
652 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
653 | ||
654 | do { | |
655 | struct sk_buff *skb; | |
656 | int chunk; | |
657 | ||
658 | skb = skb_dequeue(&sk->sk_receive_queue); | |
659 | if (!skb) { | |
660 | if (copied >= target) | |
661 | break; | |
662 | ||
663 | if ((err = sock_error(sk)) != 0) | |
664 | break; | |
665 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
666 | break; | |
667 | ||
668 | err = -EAGAIN; | |
669 | if (!timeo) | |
670 | break; | |
671 | ||
672 | timeo = rfcomm_sock_data_wait(sk, timeo); | |
673 | ||
674 | if (signal_pending(current)) { | |
675 | err = sock_intr_errno(timeo); | |
676 | goto out; | |
677 | } | |
678 | continue; | |
679 | } | |
680 | ||
681 | chunk = min_t(unsigned int, skb->len, size); | |
682 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
683 | skb_queue_head(&sk->sk_receive_queue, skb); | |
684 | if (!copied) | |
685 | copied = -EFAULT; | |
686 | break; | |
687 | } | |
688 | copied += chunk; | |
689 | size -= chunk; | |
690 | ||
691 | if (!(flags & MSG_PEEK)) { | |
692 | atomic_sub(chunk, &sk->sk_rmem_alloc); | |
693 | ||
694 | skb_pull(skb, chunk); | |
695 | if (skb->len) { | |
696 | skb_queue_head(&sk->sk_receive_queue, skb); | |
697 | break; | |
698 | } | |
699 | kfree_skb(skb); | |
700 | ||
701 | } else { | |
702 | /* put message back and return */ | |
703 | skb_queue_head(&sk->sk_receive_queue, skb); | |
704 | break; | |
705 | } | |
706 | } while (size); | |
707 | ||
708 | out: | |
709 | if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2)) | |
710 | rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc); | |
711 | ||
712 | release_sock(sk); | |
713 | return copied ? : err; | |
714 | } | |
715 | ||
716 | static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen) | |
717 | { | |
718 | struct sock *sk = sock->sk; | |
719 | int err = 0; | |
720 | u32 opt; | |
721 | ||
722 | BT_DBG("sk %p", sk); | |
723 | ||
724 | lock_sock(sk); | |
725 | ||
726 | switch (optname) { | |
727 | case RFCOMM_LM: | |
728 | if (get_user(opt, (u32 __user *) optval)) { | |
729 | err = -EFAULT; | |
730 | break; | |
731 | } | |
732 | ||
733 | rfcomm_pi(sk)->link_mode = opt; | |
734 | break; | |
735 | ||
736 | default: | |
737 | err = -ENOPROTOOPT; | |
738 | break; | |
739 | } | |
740 | ||
741 | release_sock(sk); | |
742 | return err; | |
743 | } | |
744 | ||
745 | static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) | |
746 | { | |
747 | struct sock *sk = sock->sk; | |
748 | struct sock *l2cap_sk; | |
749 | struct rfcomm_conninfo cinfo; | |
750 | int len, err = 0; | |
751 | ||
752 | BT_DBG("sk %p", sk); | |
753 | ||
754 | if (get_user(len, optlen)) | |
755 | return -EFAULT; | |
756 | ||
757 | lock_sock(sk); | |
758 | ||
759 | switch (optname) { | |
760 | case RFCOMM_LM: | |
761 | if (put_user(rfcomm_pi(sk)->link_mode, (u32 __user *) optval)) | |
762 | err = -EFAULT; | |
763 | break; | |
764 | ||
765 | case RFCOMM_CONNINFO: | |
766 | if (sk->sk_state != BT_CONNECTED) { | |
767 | err = -ENOTCONN; | |
768 | break; | |
769 | } | |
770 | ||
771 | l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk; | |
772 | ||
773 | cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle; | |
774 | memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3); | |
775 | ||
776 | len = min_t(unsigned int, len, sizeof(cinfo)); | |
777 | if (copy_to_user(optval, (char *) &cinfo, len)) | |
778 | err = -EFAULT; | |
779 | ||
780 | break; | |
781 | ||
782 | default: | |
783 | err = -ENOPROTOOPT; | |
784 | break; | |
785 | } | |
786 | ||
787 | release_sock(sk); | |
788 | return err; | |
789 | } | |
790 | ||
791 | static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
792 | { | |
793 | struct sock *sk = sock->sk; | |
794 | int err; | |
795 | ||
796 | lock_sock(sk); | |
797 | ||
798 | #ifdef CONFIG_BT_RFCOMM_TTY | |
799 | err = rfcomm_dev_ioctl(sk, cmd, (void __user *)arg); | |
800 | #else | |
801 | err = -EOPNOTSUPP; | |
802 | #endif | |
803 | ||
804 | release_sock(sk); | |
805 | return err; | |
806 | } | |
807 | ||
808 | static int rfcomm_sock_shutdown(struct socket *sock, int how) | |
809 | { | |
810 | struct sock *sk = sock->sk; | |
811 | int err = 0; | |
812 | ||
813 | BT_DBG("sock %p, sk %p", sock, sk); | |
814 | ||
815 | if (!sk) return 0; | |
816 | ||
817 | lock_sock(sk); | |
818 | if (!sk->sk_shutdown) { | |
819 | sk->sk_shutdown = SHUTDOWN_MASK; | |
820 | __rfcomm_sock_close(sk); | |
821 | ||
822 | if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) | |
823 | err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime); | |
824 | } | |
825 | release_sock(sk); | |
826 | return err; | |
827 | } | |
828 | ||
829 | static int rfcomm_sock_release(struct socket *sock) | |
830 | { | |
831 | struct sock *sk = sock->sk; | |
832 | int err; | |
833 | ||
834 | BT_DBG("sock %p, sk %p", sock, sk); | |
835 | ||
836 | if (!sk) | |
837 | return 0; | |
838 | ||
839 | err = rfcomm_sock_shutdown(sock, 2); | |
840 | ||
841 | sock_orphan(sk); | |
842 | rfcomm_sock_kill(sk); | |
843 | return err; | |
844 | } | |
845 | ||
8e87d142 | 846 | /* ---- RFCOMM core layer callbacks ---- |
1da177e4 LT |
847 | * |
848 | * called under rfcomm_lock() | |
849 | */ | |
850 | int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d) | |
851 | { | |
852 | struct sock *sk, *parent; | |
853 | bdaddr_t src, dst; | |
854 | int result = 0; | |
855 | ||
856 | BT_DBG("session %p channel %d", s, channel); | |
857 | ||
858 | rfcomm_session_getaddr(s, &src, &dst); | |
859 | ||
860 | /* Check if we have socket listening on channel */ | |
861 | parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src); | |
862 | if (!parent) | |
863 | return 0; | |
864 | ||
865 | /* Check for backlog size */ | |
866 | if (sk_acceptq_is_full(parent)) { | |
8e87d142 | 867 | BT_DBG("backlog full %d", parent->sk_ack_backlog); |
1da177e4 LT |
868 | goto done; |
869 | } | |
870 | ||
1b8d7ae4 | 871 | sk = rfcomm_sock_alloc(parent->sk_net, NULL, BTPROTO_RFCOMM, GFP_ATOMIC); |
1da177e4 LT |
872 | if (!sk) |
873 | goto done; | |
874 | ||
875 | rfcomm_sock_init(sk, parent); | |
876 | bacpy(&bt_sk(sk)->src, &src); | |
877 | bacpy(&bt_sk(sk)->dst, &dst); | |
878 | rfcomm_pi(sk)->channel = channel; | |
879 | ||
880 | sk->sk_state = BT_CONFIG; | |
881 | bt_accept_enqueue(parent, sk); | |
882 | ||
883 | /* Accept connection and return socket DLC */ | |
884 | *d = rfcomm_pi(sk)->dlc; | |
885 | result = 1; | |
886 | ||
887 | done: | |
888 | bh_unlock_sock(parent); | |
889 | return result; | |
890 | } | |
891 | ||
be9d1227 | 892 | static ssize_t rfcomm_sock_sysfs_show(struct class *dev, char *buf) |
1da177e4 LT |
893 | { |
894 | struct sock *sk; | |
895 | struct hlist_node *node; | |
be9d1227 | 896 | char *str = buf; |
1da177e4 LT |
897 | |
898 | read_lock_bh(&rfcomm_sk_list.lock); | |
899 | ||
be9d1227 MH |
900 | sk_for_each(sk, node, &rfcomm_sk_list.head) { |
901 | str += sprintf(str, "%s %s %d %d\n", | |
902 | batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst), | |
903 | sk->sk_state, rfcomm_pi(sk)->channel); | |
904 | } | |
1da177e4 | 905 | |
1da177e4 | 906 | read_unlock_bh(&rfcomm_sk_list.lock); |
1da177e4 | 907 | |
be9d1227 | 908 | return (str - buf); |
1da177e4 LT |
909 | } |
910 | ||
be9d1227 | 911 | static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL); |
1da177e4 | 912 | |
90ddc4f0 | 913 | static const struct proto_ops rfcomm_sock_ops = { |
1da177e4 LT |
914 | .family = PF_BLUETOOTH, |
915 | .owner = THIS_MODULE, | |
916 | .release = rfcomm_sock_release, | |
917 | .bind = rfcomm_sock_bind, | |
918 | .connect = rfcomm_sock_connect, | |
919 | .listen = rfcomm_sock_listen, | |
920 | .accept = rfcomm_sock_accept, | |
921 | .getname = rfcomm_sock_getname, | |
922 | .sendmsg = rfcomm_sock_sendmsg, | |
923 | .recvmsg = rfcomm_sock_recvmsg, | |
924 | .shutdown = rfcomm_sock_shutdown, | |
925 | .setsockopt = rfcomm_sock_setsockopt, | |
926 | .getsockopt = rfcomm_sock_getsockopt, | |
927 | .ioctl = rfcomm_sock_ioctl, | |
928 | .poll = bt_sock_poll, | |
929 | .socketpair = sock_no_socketpair, | |
930 | .mmap = sock_no_mmap | |
931 | }; | |
932 | ||
933 | static struct net_proto_family rfcomm_sock_family_ops = { | |
934 | .family = PF_BLUETOOTH, | |
935 | .owner = THIS_MODULE, | |
936 | .create = rfcomm_sock_create | |
937 | }; | |
938 | ||
be9d1227 | 939 | int __init rfcomm_init_sockets(void) |
1da177e4 LT |
940 | { |
941 | int err; | |
942 | ||
943 | err = proto_register(&rfcomm_proto, 0); | |
944 | if (err < 0) | |
945 | return err; | |
946 | ||
947 | err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops); | |
948 | if (err < 0) | |
949 | goto error; | |
950 | ||
df5c37ea MH |
951 | if (class_create_file(bt_class, &class_attr_rfcomm) < 0) |
952 | BT_ERR("Failed to create RFCOMM info file"); | |
1da177e4 LT |
953 | |
954 | BT_INFO("RFCOMM socket layer initialized"); | |
955 | ||
956 | return 0; | |
957 | ||
958 | error: | |
959 | BT_ERR("RFCOMM socket layer registration failed"); | |
960 | proto_unregister(&rfcomm_proto); | |
961 | return err; | |
962 | } | |
963 | ||
964 | void __exit rfcomm_cleanup_sockets(void) | |
965 | { | |
a91f2e39 | 966 | class_remove_file(bt_class, &class_attr_rfcomm); |
1da177e4 LT |
967 | |
968 | if (bt_sock_unregister(BTPROTO_RFCOMM) < 0) | |
969 | BT_ERR("RFCOMM socket layer unregistration failed"); | |
970 | ||
971 | proto_unregister(&rfcomm_proto); | |
972 | } |