544d65b7baa7de67fe796ec2e4cf68a0c6051e1f
[pandora-kernel.git] / net / bluetooth / rfcomm / sock.c
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
30 #include <linux/module.h>
31
32 #include <linux/types.h>
33 #include <linux/errno.h>
34 #include <linux/kernel.h>
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>
44 #include <linux/device.h>
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
60 static const struct proto_ops rfcomm_sock_ops;
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
285 static struct sock *rfcomm_sock_alloc(struct socket *sock, int proto, gfp_t prio)
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         sk = rfcomm_sock_alloc(sock, protocol, GFP_ATOMIC);
340         if (!sk)
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
365         if (sk->sk_type != SOCK_STREAM) {
366                 err = -EINVAL;
367                 goto done;
368         }
369
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
400         lock_sock(sk);
401
402         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
403                 err = -EBADFD;
404                 goto done;
405         }
406
407         if (sk->sk_type != SOCK_STREAM) {
408                 err = -EINVAL;
409                 goto done;
410         }
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
421 done:
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
440         if (sk->sk_type != SOCK_STREAM) {
441                 err = -EINVAL;
442                 goto done;
443         }
444
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
489         if (sk->sk_type != SOCK_STREAM) {
490                 err = -EINVAL;
491                 goto done;
492         }
493
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;
560         int err;
561         int sent = 0;
562
563         if (msg->msg_flags & MSG_OOB)
564                 return -EOPNOTSUPP;
565
566         if (sk->sk_shutdown & SEND_SHUTDOWN)
567                 return -EPIPE;
568
569         BT_DBG("sock %p, sk %p", sock, sk);
570
571         lock_sock(sk);
572
573         while (len) {
574                 size_t size = min_t(size_t, len, d->mtu);
575                 
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);
585                         sent = err;
586                         break;
587                 }
588
589                 err = rfcomm_dlc_send(d, skb);
590                 if (err < 0) {
591                         kfree_skb(skb);
592                         break;
593                 }
594
595                 sent += size;
596                 len  -= size;
597         }
598
599         release_sock(sk);
600
601         return sent ? sent : err;
602 }
603
604 static long rfcomm_sock_data_wait(struct sock *sk, long timeo)
605 {
606         DECLARE_WAITQUEUE(wait, current);
607
608         add_wait_queue(sk->sk_sleep, &wait);
609         for (;;) {
610                 set_current_state(TASK_INTERRUPTIBLE);
611
612                 if (!skb_queue_empty(&sk->sk_receive_queue) ||
613                     sk->sk_err ||
614                     (sk->sk_shutdown & RCV_SHUTDOWN) ||
615                     signal_pending(current) ||
616                     !timeo)
617                         break;
618
619                 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
620                 release_sock(sk);
621                 timeo = schedule_timeout(timeo);
622                 lock_sock(sk);
623                 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
624         }
625
626         __set_current_state(TASK_RUNNING);
627         remove_wait_queue(sk->sk_sleep, &wait);
628         return timeo;
629 }
630
631 static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
632                                struct msghdr *msg, size_t size, int flags)
633 {
634         struct sock *sk = sock->sk;
635         int err = 0;
636         size_t target, copied = 0;
637         long timeo;
638
639         if (flags & MSG_OOB)
640                 return -EOPNOTSUPP;
641
642         msg->msg_namelen = 0;
643
644         BT_DBG("sk %p size %d", sk, size);
645
646         lock_sock(sk);
647
648         target = sock_rcvlowat(sk, flags & MSG_WAITALL, size);
649         timeo  = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
650
651         do {
652                 struct sk_buff *skb;
653                 int chunk;
654
655                 skb = skb_dequeue(&sk->sk_receive_queue);
656                 if (!skb) {
657                         if (copied >= target)
658                                 break;
659
660                         if ((err = sock_error(sk)) != 0)
661                                 break;
662                         if (sk->sk_shutdown & RCV_SHUTDOWN)
663                                 break;
664
665                         err = -EAGAIN;
666                         if (!timeo)
667                                 break;
668
669                         timeo = rfcomm_sock_data_wait(sk, timeo);
670
671                         if (signal_pending(current)) {
672                                 err = sock_intr_errno(timeo);
673                                 goto out;
674                         }
675                         continue;
676                 }
677
678                 chunk = min_t(unsigned int, skb->len, size);
679                 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
680                         skb_queue_head(&sk->sk_receive_queue, skb);
681                         if (!copied)
682                                 copied = -EFAULT;
683                         break;
684                 }
685                 copied += chunk;
686                 size   -= chunk;
687
688                 if (!(flags & MSG_PEEK)) {
689                         atomic_sub(chunk, &sk->sk_rmem_alloc);
690
691                         skb_pull(skb, chunk);
692                         if (skb->len) {
693                                 skb_queue_head(&sk->sk_receive_queue, skb);
694                                 break;
695                         }
696                         kfree_skb(skb);
697
698                 } else {
699                         /* put message back and return */
700                         skb_queue_head(&sk->sk_receive_queue, skb);
701                         break;
702                 }
703         } while (size);
704
705 out:
706         if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2))
707                 rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc);
708
709         release_sock(sk);
710         return copied ? : err;
711 }
712
713 static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
714 {
715         struct sock *sk = sock->sk;
716         int err = 0;
717         u32 opt;
718
719         BT_DBG("sk %p", sk);
720
721         lock_sock(sk);
722
723         switch (optname) {
724         case RFCOMM_LM:
725                 if (get_user(opt, (u32 __user *) optval)) {
726                         err = -EFAULT;
727                         break;
728                 }
729
730                 rfcomm_pi(sk)->link_mode = opt;
731                 break;
732
733         default:
734                 err = -ENOPROTOOPT;
735                 break;
736         }
737
738         release_sock(sk);
739         return err;
740 }
741
742 static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
743 {
744         struct sock *sk = sock->sk;
745         struct sock *l2cap_sk;
746         struct rfcomm_conninfo cinfo;
747         int len, err = 0;
748
749         BT_DBG("sk %p", sk);
750
751         if (get_user(len, optlen))
752                 return -EFAULT;
753
754         lock_sock(sk);
755
756         switch (optname) {
757         case RFCOMM_LM:
758                 if (put_user(rfcomm_pi(sk)->link_mode, (u32 __user *) optval))
759                         err = -EFAULT;
760                 break;
761
762         case RFCOMM_CONNINFO:
763                 if (sk->sk_state != BT_CONNECTED) {
764                         err = -ENOTCONN;
765                         break;
766                 }
767
768                 l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
769
770                 cinfo.hci_handle = l2cap_pi(l2cap_sk)->conn->hcon->handle;
771                 memcpy(cinfo.dev_class, l2cap_pi(l2cap_sk)->conn->hcon->dev_class, 3);
772
773                 len = min_t(unsigned int, len, sizeof(cinfo));
774                 if (copy_to_user(optval, (char *) &cinfo, len))
775                         err = -EFAULT;
776
777                 break;
778
779         default:
780                 err = -ENOPROTOOPT;
781                 break;
782         }
783
784         release_sock(sk);
785         return err;
786 }
787
788 static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
789 {
790         struct sock *sk = sock->sk;
791         int err;
792
793         lock_sock(sk);
794
795 #ifdef CONFIG_BT_RFCOMM_TTY
796         err = rfcomm_dev_ioctl(sk, cmd, (void __user *)arg);
797 #else
798         err = -EOPNOTSUPP;
799 #endif
800
801         release_sock(sk);
802         return err;
803 }
804
805 static int rfcomm_sock_shutdown(struct socket *sock, int how)
806 {
807         struct sock *sk = sock->sk;
808         int err = 0;
809
810         BT_DBG("sock %p, sk %p", sock, sk);
811
812         if (!sk) return 0;
813
814         lock_sock(sk);
815         if (!sk->sk_shutdown) {
816                 sk->sk_shutdown = SHUTDOWN_MASK;
817                 __rfcomm_sock_close(sk);
818
819                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
820                         err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
821         }
822         release_sock(sk);
823         return err;
824 }
825
826 static int rfcomm_sock_release(struct socket *sock)
827 {
828         struct sock *sk = sock->sk;
829         int err;
830
831         BT_DBG("sock %p, sk %p", sock, sk);
832
833         if (!sk)
834                 return 0;
835
836         err = rfcomm_sock_shutdown(sock, 2);
837
838         sock_orphan(sk);
839         rfcomm_sock_kill(sk);
840         return err;
841 }
842
843 /* ---- RFCOMM core layer callbacks ---- 
844  *
845  * called under rfcomm_lock()
846  */
847 int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
848 {
849         struct sock *sk, *parent;
850         bdaddr_t src, dst;
851         int result = 0;
852
853         BT_DBG("session %p channel %d", s, channel);
854
855         rfcomm_session_getaddr(s, &src, &dst);
856
857         /* Check if we have socket listening on channel */
858         parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
859         if (!parent)
860                 return 0;
861
862         /* Check for backlog size */
863         if (sk_acceptq_is_full(parent)) {
864                 BT_DBG("backlog full %d", parent->sk_ack_backlog); 
865                 goto done;
866         }
867
868         sk = rfcomm_sock_alloc(NULL, BTPROTO_RFCOMM, GFP_ATOMIC);
869         if (!sk)
870                 goto done;
871
872         rfcomm_sock_init(sk, parent);
873         bacpy(&bt_sk(sk)->src, &src);
874         bacpy(&bt_sk(sk)->dst, &dst);
875         rfcomm_pi(sk)->channel = channel;
876
877         sk->sk_state = BT_CONFIG;
878         bt_accept_enqueue(parent, sk);
879
880         /* Accept connection and return socket DLC */
881         *d = rfcomm_pi(sk)->dlc;
882         result = 1;
883
884 done:
885         bh_unlock_sock(parent);
886         return result;
887 }
888
889 static ssize_t rfcomm_sock_sysfs_show(struct class *dev, char *buf)
890 {
891         struct sock *sk;
892         struct hlist_node *node;
893         char *str = buf;
894
895         read_lock_bh(&rfcomm_sk_list.lock);
896
897         sk_for_each(sk, node, &rfcomm_sk_list.head) {
898                 str += sprintf(str, "%s %s %d %d\n",
899                                 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
900                                 sk->sk_state, rfcomm_pi(sk)->channel);
901         }
902
903         read_unlock_bh(&rfcomm_sk_list.lock);
904
905         return (str - buf);
906 }
907
908 static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL);
909
910 static const struct proto_ops rfcomm_sock_ops = {
911         .family         = PF_BLUETOOTH,
912         .owner          = THIS_MODULE,
913         .release        = rfcomm_sock_release,
914         .bind           = rfcomm_sock_bind,
915         .connect        = rfcomm_sock_connect,
916         .listen         = rfcomm_sock_listen,
917         .accept         = rfcomm_sock_accept,
918         .getname        = rfcomm_sock_getname,
919         .sendmsg        = rfcomm_sock_sendmsg,
920         .recvmsg        = rfcomm_sock_recvmsg,
921         .shutdown       = rfcomm_sock_shutdown,
922         .setsockopt     = rfcomm_sock_setsockopt,
923         .getsockopt     = rfcomm_sock_getsockopt,
924         .ioctl          = rfcomm_sock_ioctl,
925         .poll           = bt_sock_poll,
926         .socketpair     = sock_no_socketpair,
927         .mmap           = sock_no_mmap
928 };
929
930 static struct net_proto_family rfcomm_sock_family_ops = {
931         .family         = PF_BLUETOOTH,
932         .owner          = THIS_MODULE,
933         .create         = rfcomm_sock_create
934 };
935
936 int __init rfcomm_init_sockets(void)
937 {
938         int err;
939
940         err = proto_register(&rfcomm_proto, 0);
941         if (err < 0)
942                 return err;
943
944         err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
945         if (err < 0)
946                 goto error;
947
948         if (class_create_file(bt_class, &class_attr_rfcomm) < 0)
949                 BT_ERR("Failed to create RFCOMM info file");
950
951         BT_INFO("RFCOMM socket layer initialized");
952
953         return 0;
954
955 error:
956         BT_ERR("RFCOMM socket layer registration failed");
957         proto_unregister(&rfcomm_proto);
958         return err;
959 }
960
961 void __exit rfcomm_cleanup_sockets(void)
962 {
963         class_remove_file(bt_class, &class_attr_rfcomm);
964
965         if (bt_sock_unregister(BTPROTO_RFCOMM) < 0)
966                 BT_ERR("RFCOMM socket layer unregistration failed");
967
968         proto_unregister(&rfcomm_proto);
969 }