[NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS.
[linux-3.10.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 net *net, struct socket *sock, int proto, gfp_t prio)
286 {
287         struct rfcomm_dlc *d;
288         struct sock *sk;
289
290         sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto);
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 net *net, 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(net, 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 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                 int err;
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                         if (sent == 0)
586                                 sent = err;
587                         break;
588                 }
589
590                 err = rfcomm_dlc_send(d, skb);
591                 if (err < 0) {
592                         kfree_skb(skb);
593                         if (sent == 0)
594                                 sent = err;
595                         break;
596                 }
597
598                 sent += size;
599                 len  -= size;
600         }
601
602         release_sock(sk);
603
604         return sent;
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
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)
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
846 /* ---- RFCOMM core layer callbacks ----
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)) {
867                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
868                 goto done;
869         }
870
871         sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC);
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
892 static ssize_t rfcomm_sock_sysfs_show(struct class *dev, char *buf)
893 {
894         struct sock *sk;
895         struct hlist_node *node;
896         char *str = buf;
897
898         read_lock_bh(&rfcomm_sk_list.lock);
899
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         }
905
906         read_unlock_bh(&rfcomm_sk_list.lock);
907
908         return (str - buf);
909 }
910
911 static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL);
912
913 static const struct proto_ops rfcomm_sock_ops = {
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
939 int __init rfcomm_init_sockets(void)
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
951         if (class_create_file(bt_class, &class_attr_rfcomm) < 0)
952                 BT_ERR("Failed to create RFCOMM info file");
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 {
966         class_remove_file(bt_class, &class_attr_rfcomm);
967
968         if (bt_sock_unregister(BTPROTO_RFCOMM) < 0)
969                 BT_ERR("RFCOMM socket layer unregistration failed");
970
971         proto_unregister(&rfcomm_proto);
972 }