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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
28#include <linux/export.h>
29#include <linux/debugfs.h>
30
31#include <net/bluetooth/bluetooth.h>
32#include <net/bluetooth/hci_core.h>
33#include <net/bluetooth/l2cap.h>
34#include <net/bluetooth/rfcomm.h>
35
36static const struct proto_ops rfcomm_sock_ops;
37
38static struct bt_sock_list rfcomm_sk_list = {
39 .lock = __RW_LOCK_UNLOCKED(rfcomm_sk_list.lock)
40};
41
42static void rfcomm_sock_close(struct sock *sk);
43static void rfcomm_sock_kill(struct sock *sk);
44
45/* ---- DLC callbacks ----
46 *
47 * called under rfcomm_dlc_lock()
48 */
49static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb)
50{
51 struct sock *sk = d->owner;
52 if (!sk)
53 return;
54
55 atomic_add(skb->len, &sk->sk_rmem_alloc);
56 skb_queue_tail(&sk->sk_receive_queue, skb);
57 sk->sk_data_ready(sk);
58
59 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
60 rfcomm_dlc_throttle(d);
61}
62
63static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
64{
65 struct sock *sk = d->owner, *parent;
66 unsigned long flags;
67
68 if (!sk)
69 return;
70
71 BT_DBG("dlc %p state %ld err %d", d, d->state, err);
72
73 local_irq_save(flags);
74 bh_lock_sock(sk);
75
76 if (err)
77 sk->sk_err = err;
78
79 sk->sk_state = d->state;
80
81 parent = bt_sk(sk)->parent;
82 if (parent) {
83 if (d->state == BT_CLOSED) {
84 sock_set_flag(sk, SOCK_ZAPPED);
85 bt_accept_unlink(sk);
86 }
87 parent->sk_data_ready(parent);
88 } else {
89 if (d->state == BT_CONNECTED)
90 rfcomm_session_getaddr(d->session,
91 &rfcomm_pi(sk)->src, NULL);
92 sk->sk_state_change(sk);
93 }
94
95 bh_unlock_sock(sk);
96 local_irq_restore(flags);
97
98 if (parent && sock_flag(sk, SOCK_ZAPPED)) {
99 /* We have to drop DLC lock here, otherwise
100 * rfcomm_sock_destruct() will dead lock. */
101 rfcomm_dlc_unlock(d);
102 rfcomm_sock_kill(sk);
103 rfcomm_dlc_lock(d);
104 }
105}
106
107/* ---- Socket functions ---- */
108static struct sock *__rfcomm_get_listen_sock_by_addr(u8 channel, bdaddr_t *src)
109{
110 struct sock *sk = NULL;
111
112 sk_for_each(sk, &rfcomm_sk_list.head) {
113 if (rfcomm_pi(sk)->channel != channel)
114 continue;
115
116 if (bacmp(&rfcomm_pi(sk)->src, src))
117 continue;
118
119 if (sk->sk_state == BT_BOUND || sk->sk_state == BT_LISTEN)
120 break;
121 }
122
123 return sk ? sk : NULL;
124}
125
126/* Find socket with channel and source bdaddr.
127 * Returns closest match.
128 */
129static struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
130{
131 struct sock *sk = NULL, *sk1 = NULL;
132
133 read_lock(&rfcomm_sk_list.lock);
134
135 sk_for_each(sk, &rfcomm_sk_list.head) {
136 if (state && sk->sk_state != state)
137 continue;
138
139 if (rfcomm_pi(sk)->channel == channel) {
140 /* Exact match. */
141 if (!bacmp(&rfcomm_pi(sk)->src, src))
142 break;
143
144 /* Closest match */
145 if (!bacmp(&rfcomm_pi(sk)->src, BDADDR_ANY))
146 sk1 = sk;
147 }
148 }
149
150 read_unlock(&rfcomm_sk_list.lock);
151
152 return sk ? sk : sk1;
153}
154
155static void rfcomm_sock_destruct(struct sock *sk)
156{
157 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
158
159 BT_DBG("sk %p dlc %p", sk, d);
160
161 skb_queue_purge(&sk->sk_receive_queue);
162 skb_queue_purge(&sk->sk_write_queue);
163
164 rfcomm_dlc_lock(d);
165 rfcomm_pi(sk)->dlc = NULL;
166
167 /* Detach DLC if it's owned by this socket */
168 if (d->owner == sk)
169 d->owner = NULL;
170 rfcomm_dlc_unlock(d);
171
172 rfcomm_dlc_put(d);
173}
174
175static void rfcomm_sock_cleanup_listen(struct sock *parent)
176{
177 struct sock *sk;
178
179 BT_DBG("parent %p", parent);
180
181 /* Close not yet accepted dlcs */
182 while ((sk = bt_accept_dequeue(parent, NULL))) {
183 rfcomm_sock_close(sk);
184 rfcomm_sock_kill(sk);
185 }
186
187 parent->sk_state = BT_CLOSED;
188 sock_set_flag(parent, SOCK_ZAPPED);
189}
190
191/* Kill socket (only if zapped and orphan)
192 * Must be called on unlocked socket.
193 */
194static void rfcomm_sock_kill(struct sock *sk)
195{
196 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
197 return;
198
199 BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
200
201 /* Kill poor orphan */
202 bt_sock_unlink(&rfcomm_sk_list, sk);
203 sock_set_flag(sk, SOCK_DEAD);
204 sock_put(sk);
205}
206
207static void __rfcomm_sock_close(struct sock *sk)
208{
209 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
210
211 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
212
213 switch (sk->sk_state) {
214 case BT_LISTEN:
215 rfcomm_sock_cleanup_listen(sk);
216 break;
217
218 case BT_CONNECT:
219 case BT_CONNECT2:
220 case BT_CONFIG:
221 case BT_CONNECTED:
222 rfcomm_dlc_close(d, 0);
223
224 default:
225 sock_set_flag(sk, SOCK_ZAPPED);
226 break;
227 }
228}
229
230/* Close socket.
231 * Must be called on unlocked socket.
232 */
233static void rfcomm_sock_close(struct sock *sk)
234{
235 lock_sock(sk);
236 __rfcomm_sock_close(sk);
237 release_sock(sk);
238}
239
240static void rfcomm_sock_init(struct sock *sk, struct sock *parent)
241{
242 struct rfcomm_pinfo *pi = rfcomm_pi(sk);
243
244 BT_DBG("sk %p", sk);
245
246 if (parent) {
247 sk->sk_type = parent->sk_type;
248 pi->dlc->defer_setup = test_bit(BT_SK_DEFER_SETUP,
249 &bt_sk(parent)->flags);
250
251 pi->sec_level = rfcomm_pi(parent)->sec_level;
252 pi->role_switch = rfcomm_pi(parent)->role_switch;
253
254 security_sk_clone(parent, sk);
255 } else {
256 pi->dlc->defer_setup = 0;
257
258 pi->sec_level = BT_SECURITY_LOW;
259 pi->role_switch = 0;
260 }
261
262 pi->dlc->sec_level = pi->sec_level;
263 pi->dlc->role_switch = pi->role_switch;
264}
265
266static struct proto rfcomm_proto = {
267 .name = "RFCOMM",
268 .owner = THIS_MODULE,
269 .obj_size = sizeof(struct rfcomm_pinfo)
270};
271
272static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio, int kern)
273{
274 struct rfcomm_dlc *d;
275 struct sock *sk;
276
277 sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto, kern);
278 if (!sk)
279 return NULL;
280
281 sock_init_data(sock, sk);
282 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
283
284 d = rfcomm_dlc_alloc(prio);
285 if (!d) {
286 sk_free(sk);
287 return NULL;
288 }
289
290 d->data_ready = rfcomm_sk_data_ready;
291 d->state_change = rfcomm_sk_state_change;
292
293 rfcomm_pi(sk)->dlc = d;
294 d->owner = sk;
295
296 sk->sk_destruct = rfcomm_sock_destruct;
297 sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT;
298
299 sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
300 sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
301
302 sock_reset_flag(sk, SOCK_ZAPPED);
303
304 sk->sk_protocol = proto;
305 sk->sk_state = BT_OPEN;
306
307 bt_sock_link(&rfcomm_sk_list, sk);
308
309 BT_DBG("sk %p", sk);
310 return sk;
311}
312
313static int rfcomm_sock_create(struct net *net, struct socket *sock,
314 int protocol, int kern)
315{
316 struct sock *sk;
317
318 BT_DBG("sock %p", sock);
319
320 sock->state = SS_UNCONNECTED;
321
322 if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW)
323 return -ESOCKTNOSUPPORT;
324
325 sock->ops = &rfcomm_sock_ops;
326
327 sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
328 if (!sk)
329 return -ENOMEM;
330
331 rfcomm_sock_init(sk, NULL);
332 return 0;
333}
334
335static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
336{
337 struct sockaddr_rc sa;
338 struct sock *sk = sock->sk;
339 int len, err = 0;
340
341 if (!addr || addr->sa_family != AF_BLUETOOTH)
342 return -EINVAL;
343
344 memset(&sa, 0, sizeof(sa));
345 len = min_t(unsigned int, sizeof(sa), addr_len);
346 memcpy(&sa, addr, len);
347
348 BT_DBG("sk %p %pMR", sk, &sa.rc_bdaddr);
349
350 lock_sock(sk);
351
352 if (sk->sk_state != BT_OPEN) {
353 err = -EBADFD;
354 goto done;
355 }
356
357 if (sk->sk_type != SOCK_STREAM) {
358 err = -EINVAL;
359 goto done;
360 }
361
362 write_lock(&rfcomm_sk_list.lock);
363
364 if (sa.rc_channel &&
365 __rfcomm_get_listen_sock_by_addr(sa.rc_channel, &sa.rc_bdaddr)) {
366 err = -EADDRINUSE;
367 } else {
368 /* Save source address */
369 bacpy(&rfcomm_pi(sk)->src, &sa.rc_bdaddr);
370 rfcomm_pi(sk)->channel = sa.rc_channel;
371 sk->sk_state = BT_BOUND;
372 }
373
374 write_unlock(&rfcomm_sk_list.lock);
375
376done:
377 release_sock(sk);
378 return err;
379}
380
381static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
382{
383 struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
384 struct sock *sk = sock->sk;
385 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
386 int err = 0;
387
388 BT_DBG("sk %p", sk);
389
390 if (alen < sizeof(struct sockaddr_rc) ||
391 addr->sa_family != AF_BLUETOOTH)
392 return -EINVAL;
393
394 lock_sock(sk);
395
396 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
397 err = -EBADFD;
398 goto done;
399 }
400
401 if (sk->sk_type != SOCK_STREAM) {
402 err = -EINVAL;
403 goto done;
404 }
405
406 sk->sk_state = BT_CONNECT;
407 bacpy(&rfcomm_pi(sk)->dst, &sa->rc_bdaddr);
408 rfcomm_pi(sk)->channel = sa->rc_channel;
409
410 d->sec_level = rfcomm_pi(sk)->sec_level;
411 d->role_switch = rfcomm_pi(sk)->role_switch;
412
413 err = rfcomm_dlc_open(d, &rfcomm_pi(sk)->src, &sa->rc_bdaddr,
414 sa->rc_channel);
415 if (!err)
416 err = bt_sock_wait_state(sk, BT_CONNECTED,
417 sock_sndtimeo(sk, flags & O_NONBLOCK));
418
419done:
420 release_sock(sk);
421 return err;
422}
423
424static int rfcomm_sock_listen(struct socket *sock, int backlog)
425{
426 struct sock *sk = sock->sk;
427 int err = 0;
428
429 BT_DBG("sk %p backlog %d", sk, backlog);
430
431 lock_sock(sk);
432
433 if (sk->sk_state != BT_BOUND) {
434 err = -EBADFD;
435 goto done;
436 }
437
438 if (sk->sk_type != SOCK_STREAM) {
439 err = -EINVAL;
440 goto done;
441 }
442
443 if (!rfcomm_pi(sk)->channel) {
444 bdaddr_t *src = &rfcomm_pi(sk)->src;
445 u8 channel;
446
447 err = -EINVAL;
448
449 write_lock(&rfcomm_sk_list.lock);
450
451 for (channel = 1; channel < 31; channel++)
452 if (!__rfcomm_get_listen_sock_by_addr(channel, src)) {
453 rfcomm_pi(sk)->channel = channel;
454 err = 0;
455 break;
456 }
457
458 write_unlock(&rfcomm_sk_list.lock);
459
460 if (err < 0)
461 goto done;
462 }
463
464 sk->sk_max_ack_backlog = backlog;
465 sk->sk_ack_backlog = 0;
466 sk->sk_state = BT_LISTEN;
467
468done:
469 release_sock(sk);
470 return err;
471}
472
473static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags)
474{
475 DEFINE_WAIT_FUNC(wait, woken_wake_function);
476 struct sock *sk = sock->sk, *nsk;
477 long timeo;
478 int err = 0;
479
480 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
481
482 if (sk->sk_type != SOCK_STREAM) {
483 err = -EINVAL;
484 goto done;
485 }
486
487 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
488
489 BT_DBG("sk %p timeo %ld", sk, timeo);
490
491 /* Wait for an incoming connection. (wake-one). */
492 add_wait_queue_exclusive(sk_sleep(sk), &wait);
493 while (1) {
494 if (sk->sk_state != BT_LISTEN) {
495 err = -EBADFD;
496 break;
497 }
498
499 nsk = bt_accept_dequeue(sk, newsock);
500 if (nsk)
501 break;
502
503 if (!timeo) {
504 err = -EAGAIN;
505 break;
506 }
507
508 if (signal_pending(current)) {
509 err = sock_intr_errno(timeo);
510 break;
511 }
512
513 release_sock(sk);
514
515 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
516
517 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
518 }
519 remove_wait_queue(sk_sleep(sk), &wait);
520
521 if (err)
522 goto done;
523
524 newsock->state = SS_CONNECTED;
525
526 BT_DBG("new socket %p", nsk);
527
528done:
529 release_sock(sk);
530 return err;
531}
532
533static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
534{
535 struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
536 struct sock *sk = sock->sk;
537
538 BT_DBG("sock %p, sk %p", sock, sk);
539
540 if (peer && sk->sk_state != BT_CONNECTED &&
541 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2)
542 return -ENOTCONN;
543
544 memset(sa, 0, sizeof(*sa));
545 sa->rc_family = AF_BLUETOOTH;
546 sa->rc_channel = rfcomm_pi(sk)->channel;
547 if (peer)
548 bacpy(&sa->rc_bdaddr, &rfcomm_pi(sk)->dst);
549 else
550 bacpy(&sa->rc_bdaddr, &rfcomm_pi(sk)->src);
551
552 *len = sizeof(struct sockaddr_rc);
553 return 0;
554}
555
556static int rfcomm_sock_sendmsg(struct socket *sock, struct msghdr *msg,
557 size_t len)
558{
559 struct sock *sk = sock->sk;
560 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
561 struct sk_buff *skb;
562 int sent;
563
564 if (test_bit(RFCOMM_DEFER_SETUP, &d->flags))
565 return -ENOTCONN;
566
567 if (msg->msg_flags & MSG_OOB)
568 return -EOPNOTSUPP;
569
570 if (sk->sk_shutdown & SEND_SHUTDOWN)
571 return -EPIPE;
572
573 BT_DBG("sock %p, sk %p", sock, sk);
574
575 lock_sock(sk);
576
577 sent = bt_sock_wait_ready(sk, msg->msg_flags);
578 if (sent)
579 goto done;
580
581 while (len) {
582 size_t size = min_t(size_t, len, d->mtu);
583 int err;
584
585 skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE,
586 msg->msg_flags & MSG_DONTWAIT, &err);
587 if (!skb) {
588 if (sent == 0)
589 sent = err;
590 break;
591 }
592 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
593
594 err = memcpy_from_msg(skb_put(skb, size), msg, size);
595 if (err) {
596 kfree_skb(skb);
597 if (sent == 0)
598 sent = err;
599 break;
600 }
601
602 skb->priority = sk->sk_priority;
603
604 err = rfcomm_dlc_send(d, skb);
605 if (err < 0) {
606 kfree_skb(skb);
607 if (sent == 0)
608 sent = err;
609 break;
610 }
611
612 sent += size;
613 len -= size;
614 }
615
616done:
617 release_sock(sk);
618
619 return sent;
620}
621
622static int rfcomm_sock_recvmsg(struct socket *sock, struct msghdr *msg,
623 size_t size, int flags)
624{
625 struct sock *sk = sock->sk;
626 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
627 int len;
628
629 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
630 rfcomm_dlc_accept(d);
631 return 0;
632 }
633
634 len = bt_sock_stream_recvmsg(sock, msg, size, flags);
635
636 lock_sock(sk);
637 if (!(flags & MSG_PEEK) && len > 0)
638 atomic_sub(len, &sk->sk_rmem_alloc);
639
640 if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2))
641 rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc);
642 release_sock(sk);
643
644 return len;
645}
646
647static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
648{
649 struct sock *sk = sock->sk;
650 int err = 0;
651 u32 opt;
652
653 BT_DBG("sk %p", sk);
654
655 lock_sock(sk);
656
657 switch (optname) {
658 case RFCOMM_LM:
659 if (get_user(opt, (u32 __user *) optval)) {
660 err = -EFAULT;
661 break;
662 }
663
664 if (opt & RFCOMM_LM_FIPS) {
665 err = -EINVAL;
666 break;
667 }
668
669 if (opt & RFCOMM_LM_AUTH)
670 rfcomm_pi(sk)->sec_level = BT_SECURITY_LOW;
671 if (opt & RFCOMM_LM_ENCRYPT)
672 rfcomm_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
673 if (opt & RFCOMM_LM_SECURE)
674 rfcomm_pi(sk)->sec_level = BT_SECURITY_HIGH;
675
676 rfcomm_pi(sk)->role_switch = (opt & RFCOMM_LM_MASTER);
677 break;
678
679 default:
680 err = -ENOPROTOOPT;
681 break;
682 }
683
684 release_sock(sk);
685 return err;
686}
687
688static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
689{
690 struct sock *sk = sock->sk;
691 struct bt_security sec;
692 int err = 0;
693 size_t len;
694 u32 opt;
695
696 BT_DBG("sk %p", sk);
697
698 if (level == SOL_RFCOMM)
699 return rfcomm_sock_setsockopt_old(sock, optname, optval, optlen);
700
701 if (level != SOL_BLUETOOTH)
702 return -ENOPROTOOPT;
703
704 lock_sock(sk);
705
706 switch (optname) {
707 case BT_SECURITY:
708 if (sk->sk_type != SOCK_STREAM) {
709 err = -EINVAL;
710 break;
711 }
712
713 sec.level = BT_SECURITY_LOW;
714
715 len = min_t(unsigned int, sizeof(sec), optlen);
716 if (copy_from_user((char *) &sec, optval, len)) {
717 err = -EFAULT;
718 break;
719 }
720
721 if (sec.level > BT_SECURITY_HIGH) {
722 err = -EINVAL;
723 break;
724 }
725
726 rfcomm_pi(sk)->sec_level = sec.level;
727 break;
728
729 case BT_DEFER_SETUP:
730 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
731 err = -EINVAL;
732 break;
733 }
734
735 if (get_user(opt, (u32 __user *) optval)) {
736 err = -EFAULT;
737 break;
738 }
739
740 if (opt)
741 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
742 else
743 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
744
745 break;
746
747 default:
748 err = -ENOPROTOOPT;
749 break;
750 }
751
752 release_sock(sk);
753 return err;
754}
755
756static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
757{
758 struct sock *sk = sock->sk;
759 struct sock *l2cap_sk;
760 struct l2cap_conn *conn;
761 struct rfcomm_conninfo cinfo;
762 int len, err = 0;
763 u32 opt;
764
765 BT_DBG("sk %p", sk);
766
767 if (get_user(len, optlen))
768 return -EFAULT;
769
770 lock_sock(sk);
771
772 switch (optname) {
773 case RFCOMM_LM:
774 switch (rfcomm_pi(sk)->sec_level) {
775 case BT_SECURITY_LOW:
776 opt = RFCOMM_LM_AUTH;
777 break;
778 case BT_SECURITY_MEDIUM:
779 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT;
780 break;
781 case BT_SECURITY_HIGH:
782 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
783 RFCOMM_LM_SECURE;
784 break;
785 case BT_SECURITY_FIPS:
786 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
787 RFCOMM_LM_SECURE | RFCOMM_LM_FIPS;
788 break;
789 default:
790 opt = 0;
791 break;
792 }
793
794 if (rfcomm_pi(sk)->role_switch)
795 opt |= RFCOMM_LM_MASTER;
796
797 if (put_user(opt, (u32 __user *) optval))
798 err = -EFAULT;
799
800 break;
801
802 case RFCOMM_CONNINFO:
803 if (sk->sk_state != BT_CONNECTED &&
804 !rfcomm_pi(sk)->dlc->defer_setup) {
805 err = -ENOTCONN;
806 break;
807 }
808
809 l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
810 conn = l2cap_pi(l2cap_sk)->chan->conn;
811
812 memset(&cinfo, 0, sizeof(cinfo));
813 cinfo.hci_handle = conn->hcon->handle;
814 memcpy(cinfo.dev_class, conn->hcon->dev_class, 3);
815
816 len = min_t(unsigned int, len, sizeof(cinfo));
817 if (copy_to_user(optval, (char *) &cinfo, len))
818 err = -EFAULT;
819
820 break;
821
822 default:
823 err = -ENOPROTOOPT;
824 break;
825 }
826
827 release_sock(sk);
828 return err;
829}
830
831static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
832{
833 struct sock *sk = sock->sk;
834 struct bt_security sec;
835 int len, err = 0;
836
837 BT_DBG("sk %p", sk);
838
839 if (level == SOL_RFCOMM)
840 return rfcomm_sock_getsockopt_old(sock, optname, optval, optlen);
841
842 if (level != SOL_BLUETOOTH)
843 return -ENOPROTOOPT;
844
845 if (get_user(len, optlen))
846 return -EFAULT;
847
848 lock_sock(sk);
849
850 switch (optname) {
851 case BT_SECURITY:
852 if (sk->sk_type != SOCK_STREAM) {
853 err = -EINVAL;
854 break;
855 }
856
857 sec.level = rfcomm_pi(sk)->sec_level;
858 sec.key_size = 0;
859
860 len = min_t(unsigned int, len, sizeof(sec));
861 if (copy_to_user(optval, (char *) &sec, len))
862 err = -EFAULT;
863
864 break;
865
866 case BT_DEFER_SETUP:
867 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
868 err = -EINVAL;
869 break;
870 }
871
872 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
873 (u32 __user *) optval))
874 err = -EFAULT;
875
876 break;
877
878 default:
879 err = -ENOPROTOOPT;
880 break;
881 }
882
883 release_sock(sk);
884 return err;
885}
886
887static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
888{
889 struct sock *sk __maybe_unused = sock->sk;
890 int err;
891
892 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
893
894 err = bt_sock_ioctl(sock, cmd, arg);
895
896 if (err == -ENOIOCTLCMD) {
897#ifdef CONFIG_BT_RFCOMM_TTY
898 lock_sock(sk);
899 err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg);
900 release_sock(sk);
901#else
902 err = -EOPNOTSUPP;
903#endif
904 }
905
906 return err;
907}
908
909static int rfcomm_sock_shutdown(struct socket *sock, int how)
910{
911 struct sock *sk = sock->sk;
912 int err = 0;
913
914 BT_DBG("sock %p, sk %p", sock, sk);
915
916 if (!sk)
917 return 0;
918
919 lock_sock(sk);
920 if (!sk->sk_shutdown) {
921 sk->sk_shutdown = SHUTDOWN_MASK;
922 __rfcomm_sock_close(sk);
923
924 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
925 !(current->flags & PF_EXITING))
926 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
927 }
928 release_sock(sk);
929 return err;
930}
931
932static int rfcomm_sock_release(struct socket *sock)
933{
934 struct sock *sk = sock->sk;
935 int err;
936
937 BT_DBG("sock %p, sk %p", sock, sk);
938
939 if (!sk)
940 return 0;
941
942 err = rfcomm_sock_shutdown(sock, 2);
943
944 sock_orphan(sk);
945 rfcomm_sock_kill(sk);
946 return err;
947}
948
949/* ---- RFCOMM core layer callbacks ----
950 *
951 * called under rfcomm_lock()
952 */
953int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
954{
955 struct sock *sk, *parent;
956 bdaddr_t src, dst;
957 int result = 0;
958
959 BT_DBG("session %p channel %d", s, channel);
960
961 rfcomm_session_getaddr(s, &src, &dst);
962
963 /* Check if we have socket listening on channel */
964 parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
965 if (!parent)
966 return 0;
967
968 bh_lock_sock(parent);
969
970 /* Check for backlog size */
971 if (sk_acceptq_is_full(parent)) {
972 BT_DBG("backlog full %d", parent->sk_ack_backlog);
973 goto done;
974 }
975
976 sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC, 0);
977 if (!sk)
978 goto done;
979
980 bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM);
981
982 rfcomm_sock_init(sk, parent);
983 bacpy(&rfcomm_pi(sk)->src, &src);
984 bacpy(&rfcomm_pi(sk)->dst, &dst);
985 rfcomm_pi(sk)->channel = channel;
986
987 sk->sk_state = BT_CONFIG;
988 bt_accept_enqueue(parent, sk);
989
990 /* Accept connection and return socket DLC */
991 *d = rfcomm_pi(sk)->dlc;
992 result = 1;
993
994done:
995 bh_unlock_sock(parent);
996
997 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
998 parent->sk_state_change(parent);
999
1000 return result;
1001}
1002
1003static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p)
1004{
1005 struct sock *sk;
1006
1007 read_lock(&rfcomm_sk_list.lock);
1008
1009 sk_for_each(sk, &rfcomm_sk_list.head) {
1010 seq_printf(f, "%pMR %pMR %d %d\n",
1011 &rfcomm_pi(sk)->src, &rfcomm_pi(sk)->dst,
1012 sk->sk_state, rfcomm_pi(sk)->channel);
1013 }
1014
1015 read_unlock(&rfcomm_sk_list.lock);
1016
1017 return 0;
1018}
1019
1020static int rfcomm_sock_debugfs_open(struct inode *inode, struct file *file)
1021{
1022 return single_open(file, rfcomm_sock_debugfs_show, inode->i_private);
1023}
1024
1025static const struct file_operations rfcomm_sock_debugfs_fops = {
1026 .open = rfcomm_sock_debugfs_open,
1027 .read = seq_read,
1028 .llseek = seq_lseek,
1029 .release = single_release,
1030};
1031
1032static struct dentry *rfcomm_sock_debugfs;
1033
1034static const struct proto_ops rfcomm_sock_ops = {
1035 .family = PF_BLUETOOTH,
1036 .owner = THIS_MODULE,
1037 .release = rfcomm_sock_release,
1038 .bind = rfcomm_sock_bind,
1039 .connect = rfcomm_sock_connect,
1040 .listen = rfcomm_sock_listen,
1041 .accept = rfcomm_sock_accept,
1042 .getname = rfcomm_sock_getname,
1043 .sendmsg = rfcomm_sock_sendmsg,
1044 .recvmsg = rfcomm_sock_recvmsg,
1045 .shutdown = rfcomm_sock_shutdown,
1046 .setsockopt = rfcomm_sock_setsockopt,
1047 .getsockopt = rfcomm_sock_getsockopt,
1048 .ioctl = rfcomm_sock_ioctl,
1049 .poll = bt_sock_poll,
1050 .socketpair = sock_no_socketpair,
1051 .mmap = sock_no_mmap
1052};
1053
1054static const struct net_proto_family rfcomm_sock_family_ops = {
1055 .family = PF_BLUETOOTH,
1056 .owner = THIS_MODULE,
1057 .create = rfcomm_sock_create
1058};
1059
1060int __init rfcomm_init_sockets(void)
1061{
1062 int err;
1063
1064 BUILD_BUG_ON(sizeof(struct sockaddr_rc) > sizeof(struct sockaddr));
1065
1066 err = proto_register(&rfcomm_proto, 0);
1067 if (err < 0)
1068 return err;
1069
1070 err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
1071 if (err < 0) {
1072 BT_ERR("RFCOMM socket layer registration failed");
1073 goto error;
1074 }
1075
1076 err = bt_procfs_init(&init_net, "rfcomm", &rfcomm_sk_list, NULL);
1077 if (err < 0) {
1078 BT_ERR("Failed to create RFCOMM proc file");
1079 bt_sock_unregister(BTPROTO_RFCOMM);
1080 goto error;
1081 }
1082
1083 BT_INFO("RFCOMM socket layer initialized");
1084
1085 if (IS_ERR_OR_NULL(bt_debugfs))
1086 return 0;
1087
1088 rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444,
1089 bt_debugfs, NULL,
1090 &rfcomm_sock_debugfs_fops);
1091
1092 return 0;
1093
1094error:
1095 proto_unregister(&rfcomm_proto);
1096 return err;
1097}
1098
1099void __exit rfcomm_cleanup_sockets(void)
1100{
1101 bt_procfs_cleanup(&init_net, "rfcomm");
1102
1103 debugfs_remove(rfcomm_sock_debugfs);
1104
1105 bt_sock_unregister(BTPROTO_RFCOMM);
1106
1107 proto_unregister(&rfcomm_proto);
1108}
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
28#include <linux/module.h>
29
30#include <linux/types.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
33#include <linux/sched.h>
34#include <linux/slab.h>
35#include <linux/poll.h>
36#include <linux/fcntl.h>
37#include <linux/init.h>
38#include <linux/interrupt.h>
39#include <linux/socket.h>
40#include <linux/skbuff.h>
41#include <linux/list.h>
42#include <linux/device.h>
43#include <linux/debugfs.h>
44#include <linux/seq_file.h>
45#include <linux/security.h>
46#include <net/sock.h>
47
48#include <linux/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
55static const struct proto_ops rfcomm_sock_ops;
56
57static struct bt_sock_list rfcomm_sk_list = {
58 .lock = __RW_LOCK_UNLOCKED(rfcomm_sk_list.lock)
59};
60
61static void rfcomm_sock_close(struct sock *sk);
62static void rfcomm_sock_kill(struct sock *sk);
63
64/* ---- DLC callbacks ----
65 *
66 * called under rfcomm_dlc_lock()
67 */
68static void rfcomm_sk_data_ready(struct rfcomm_dlc *d, struct sk_buff *skb)
69{
70 struct sock *sk = d->owner;
71 if (!sk)
72 return;
73
74 atomic_add(skb->len, &sk->sk_rmem_alloc);
75 skb_queue_tail(&sk->sk_receive_queue, skb);
76 sk->sk_data_ready(sk, skb->len);
77
78 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
79 rfcomm_dlc_throttle(d);
80}
81
82static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
83{
84 struct sock *sk = d->owner, *parent;
85 unsigned long flags;
86
87 if (!sk)
88 return;
89
90 BT_DBG("dlc %p state %ld err %d", d, d->state, err);
91
92 local_irq_save(flags);
93 bh_lock_sock(sk);
94
95 if (err)
96 sk->sk_err = err;
97
98 sk->sk_state = d->state;
99
100 parent = bt_sk(sk)->parent;
101 if (parent) {
102 if (d->state == BT_CLOSED) {
103 sock_set_flag(sk, SOCK_ZAPPED);
104 bt_accept_unlink(sk);
105 }
106 parent->sk_data_ready(parent, 0);
107 } else {
108 if (d->state == BT_CONNECTED)
109 rfcomm_session_getaddr(d->session, &bt_sk(sk)->src, NULL);
110 sk->sk_state_change(sk);
111 }
112
113 bh_unlock_sock(sk);
114 local_irq_restore(flags);
115
116 if (parent && sock_flag(sk, SOCK_ZAPPED)) {
117 /* We have to drop DLC lock here, otherwise
118 * rfcomm_sock_destruct() will dead lock. */
119 rfcomm_dlc_unlock(d);
120 rfcomm_sock_kill(sk);
121 rfcomm_dlc_lock(d);
122 }
123}
124
125/* ---- Socket functions ---- */
126static struct sock *__rfcomm_get_sock_by_addr(u8 channel, bdaddr_t *src)
127{
128 struct sock *sk = NULL;
129 struct hlist_node *node;
130
131 sk_for_each(sk, node, &rfcomm_sk_list.head) {
132 if (rfcomm_pi(sk)->channel == channel &&
133 !bacmp(&bt_sk(sk)->src, src))
134 break;
135 }
136
137 return node ? sk : NULL;
138}
139
140/* Find socket with channel and source bdaddr.
141 * Returns closest match.
142 */
143static struct sock *rfcomm_get_sock_by_channel(int state, u8 channel, bdaddr_t *src)
144{
145 struct sock *sk = NULL, *sk1 = NULL;
146 struct hlist_node *node;
147
148 read_lock(&rfcomm_sk_list.lock);
149
150 sk_for_each(sk, node, &rfcomm_sk_list.head) {
151 if (state && sk->sk_state != state)
152 continue;
153
154 if (rfcomm_pi(sk)->channel == channel) {
155 /* Exact match. */
156 if (!bacmp(&bt_sk(sk)->src, src))
157 break;
158
159 /* Closest match */
160 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
161 sk1 = sk;
162 }
163 }
164
165 read_unlock(&rfcomm_sk_list.lock);
166
167 return node ? sk : sk1;
168}
169
170static void rfcomm_sock_destruct(struct sock *sk)
171{
172 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
173
174 BT_DBG("sk %p dlc %p", sk, d);
175
176 skb_queue_purge(&sk->sk_receive_queue);
177 skb_queue_purge(&sk->sk_write_queue);
178
179 rfcomm_dlc_lock(d);
180 rfcomm_pi(sk)->dlc = NULL;
181
182 /* Detach DLC if it's owned by this socket */
183 if (d->owner == sk)
184 d->owner = NULL;
185 rfcomm_dlc_unlock(d);
186
187 rfcomm_dlc_put(d);
188}
189
190static void rfcomm_sock_cleanup_listen(struct sock *parent)
191{
192 struct sock *sk;
193
194 BT_DBG("parent %p", parent);
195
196 /* Close not yet accepted dlcs */
197 while ((sk = bt_accept_dequeue(parent, NULL))) {
198 rfcomm_sock_close(sk);
199 rfcomm_sock_kill(sk);
200 }
201
202 parent->sk_state = BT_CLOSED;
203 sock_set_flag(parent, SOCK_ZAPPED);
204}
205
206/* Kill socket (only if zapped and orphan)
207 * Must be called on unlocked socket.
208 */
209static void rfcomm_sock_kill(struct sock *sk)
210{
211 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
212 return;
213
214 BT_DBG("sk %p state %d refcnt %d", sk, sk->sk_state, atomic_read(&sk->sk_refcnt));
215
216 /* Kill poor orphan */
217 bt_sock_unlink(&rfcomm_sk_list, sk);
218 sock_set_flag(sk, SOCK_DEAD);
219 sock_put(sk);
220}
221
222static void __rfcomm_sock_close(struct sock *sk)
223{
224 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
225
226 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
227
228 switch (sk->sk_state) {
229 case BT_LISTEN:
230 rfcomm_sock_cleanup_listen(sk);
231 break;
232
233 case BT_CONNECT:
234 case BT_CONNECT2:
235 case BT_CONFIG:
236 case BT_CONNECTED:
237 rfcomm_dlc_close(d, 0);
238
239 default:
240 sock_set_flag(sk, SOCK_ZAPPED);
241 break;
242 }
243}
244
245/* Close socket.
246 * Must be called on unlocked socket.
247 */
248static void rfcomm_sock_close(struct sock *sk)
249{
250 lock_sock(sk);
251 __rfcomm_sock_close(sk);
252 release_sock(sk);
253}
254
255static void rfcomm_sock_init(struct sock *sk, struct sock *parent)
256{
257 struct rfcomm_pinfo *pi = rfcomm_pi(sk);
258
259 BT_DBG("sk %p", sk);
260
261 if (parent) {
262 sk->sk_type = parent->sk_type;
263 pi->dlc->defer_setup = test_bit(BT_SK_DEFER_SETUP,
264 &bt_sk(parent)->flags);
265
266 pi->sec_level = rfcomm_pi(parent)->sec_level;
267 pi->role_switch = rfcomm_pi(parent)->role_switch;
268
269 security_sk_clone(parent, sk);
270 } else {
271 pi->dlc->defer_setup = 0;
272
273 pi->sec_level = BT_SECURITY_LOW;
274 pi->role_switch = 0;
275 }
276
277 pi->dlc->sec_level = pi->sec_level;
278 pi->dlc->role_switch = pi->role_switch;
279}
280
281static struct proto rfcomm_proto = {
282 .name = "RFCOMM",
283 .owner = THIS_MODULE,
284 .obj_size = sizeof(struct rfcomm_pinfo)
285};
286
287static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
288{
289 struct rfcomm_dlc *d;
290 struct sock *sk;
291
292 sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto);
293 if (!sk)
294 return NULL;
295
296 sock_init_data(sock, sk);
297 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
298
299 d = rfcomm_dlc_alloc(prio);
300 if (!d) {
301 sk_free(sk);
302 return NULL;
303 }
304
305 d->data_ready = rfcomm_sk_data_ready;
306 d->state_change = rfcomm_sk_state_change;
307
308 rfcomm_pi(sk)->dlc = d;
309 d->owner = sk;
310
311 sk->sk_destruct = rfcomm_sock_destruct;
312 sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT;
313
314 sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
315 sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
316
317 sock_reset_flag(sk, SOCK_ZAPPED);
318
319 sk->sk_protocol = proto;
320 sk->sk_state = BT_OPEN;
321
322 bt_sock_link(&rfcomm_sk_list, sk);
323
324 BT_DBG("sk %p", sk);
325 return sk;
326}
327
328static int rfcomm_sock_create(struct net *net, struct socket *sock,
329 int protocol, int kern)
330{
331 struct sock *sk;
332
333 BT_DBG("sock %p", sock);
334
335 sock->state = SS_UNCONNECTED;
336
337 if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW)
338 return -ESOCKTNOSUPPORT;
339
340 sock->ops = &rfcomm_sock_ops;
341
342 sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC);
343 if (!sk)
344 return -ENOMEM;
345
346 rfcomm_sock_init(sk, NULL);
347 return 0;
348}
349
350static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
351{
352 struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
353 struct sock *sk = sock->sk;
354 int err = 0;
355
356 BT_DBG("sk %p %s", sk, batostr(&sa->rc_bdaddr));
357
358 if (!addr || addr->sa_family != AF_BLUETOOTH)
359 return -EINVAL;
360
361 lock_sock(sk);
362
363 if (sk->sk_state != BT_OPEN) {
364 err = -EBADFD;
365 goto done;
366 }
367
368 if (sk->sk_type != SOCK_STREAM) {
369 err = -EINVAL;
370 goto done;
371 }
372
373 write_lock(&rfcomm_sk_list.lock);
374
375 if (sa->rc_channel && __rfcomm_get_sock_by_addr(sa->rc_channel, &sa->rc_bdaddr)) {
376 err = -EADDRINUSE;
377 } else {
378 /* Save source address */
379 bacpy(&bt_sk(sk)->src, &sa->rc_bdaddr);
380 rfcomm_pi(sk)->channel = sa->rc_channel;
381 sk->sk_state = BT_BOUND;
382 }
383
384 write_unlock(&rfcomm_sk_list.lock);
385
386done:
387 release_sock(sk);
388 return err;
389}
390
391static int rfcomm_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
392{
393 struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
394 struct sock *sk = sock->sk;
395 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
396 int err = 0;
397
398 BT_DBG("sk %p", sk);
399
400 if (alen < sizeof(struct sockaddr_rc) ||
401 addr->sa_family != AF_BLUETOOTH)
402 return -EINVAL;
403
404 lock_sock(sk);
405
406 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND) {
407 err = -EBADFD;
408 goto done;
409 }
410
411 if (sk->sk_type != SOCK_STREAM) {
412 err = -EINVAL;
413 goto done;
414 }
415
416 sk->sk_state = BT_CONNECT;
417 bacpy(&bt_sk(sk)->dst, &sa->rc_bdaddr);
418 rfcomm_pi(sk)->channel = sa->rc_channel;
419
420 d->sec_level = rfcomm_pi(sk)->sec_level;
421 d->role_switch = rfcomm_pi(sk)->role_switch;
422
423 err = rfcomm_dlc_open(d, &bt_sk(sk)->src, &sa->rc_bdaddr, sa->rc_channel);
424 if (!err)
425 err = bt_sock_wait_state(sk, BT_CONNECTED,
426 sock_sndtimeo(sk, flags & O_NONBLOCK));
427
428done:
429 release_sock(sk);
430 return err;
431}
432
433static int rfcomm_sock_listen(struct socket *sock, int backlog)
434{
435 struct sock *sk = sock->sk;
436 int err = 0;
437
438 BT_DBG("sk %p backlog %d", sk, backlog);
439
440 lock_sock(sk);
441
442 if (sk->sk_state != BT_BOUND) {
443 err = -EBADFD;
444 goto done;
445 }
446
447 if (sk->sk_type != SOCK_STREAM) {
448 err = -EINVAL;
449 goto done;
450 }
451
452 if (!rfcomm_pi(sk)->channel) {
453 bdaddr_t *src = &bt_sk(sk)->src;
454 u8 channel;
455
456 err = -EINVAL;
457
458 write_lock(&rfcomm_sk_list.lock);
459
460 for (channel = 1; channel < 31; channel++)
461 if (!__rfcomm_get_sock_by_addr(channel, src)) {
462 rfcomm_pi(sk)->channel = channel;
463 err = 0;
464 break;
465 }
466
467 write_unlock(&rfcomm_sk_list.lock);
468
469 if (err < 0)
470 goto done;
471 }
472
473 sk->sk_max_ack_backlog = backlog;
474 sk->sk_ack_backlog = 0;
475 sk->sk_state = BT_LISTEN;
476
477done:
478 release_sock(sk);
479 return err;
480}
481
482static int rfcomm_sock_accept(struct socket *sock, struct socket *newsock, int flags)
483{
484 DECLARE_WAITQUEUE(wait, current);
485 struct sock *sk = sock->sk, *nsk;
486 long timeo;
487 int err = 0;
488
489 lock_sock(sk);
490
491 if (sk->sk_type != SOCK_STREAM) {
492 err = -EINVAL;
493 goto done;
494 }
495
496 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
497
498 BT_DBG("sk %p timeo %ld", sk, timeo);
499
500 /* Wait for an incoming connection. (wake-one). */
501 add_wait_queue_exclusive(sk_sleep(sk), &wait);
502 while (1) {
503 set_current_state(TASK_INTERRUPTIBLE);
504
505 if (sk->sk_state != BT_LISTEN) {
506 err = -EBADFD;
507 break;
508 }
509
510 nsk = bt_accept_dequeue(sk, newsock);
511 if (nsk)
512 break;
513
514 if (!timeo) {
515 err = -EAGAIN;
516 break;
517 }
518
519 if (signal_pending(current)) {
520 err = sock_intr_errno(timeo);
521 break;
522 }
523
524 release_sock(sk);
525 timeo = schedule_timeout(timeo);
526 lock_sock(sk);
527 }
528 __set_current_state(TASK_RUNNING);
529 remove_wait_queue(sk_sleep(sk), &wait);
530
531 if (err)
532 goto done;
533
534 newsock->state = SS_CONNECTED;
535
536 BT_DBG("new socket %p", nsk);
537
538done:
539 release_sock(sk);
540 return err;
541}
542
543static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
544{
545 struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
546 struct sock *sk = sock->sk;
547
548 BT_DBG("sock %p, sk %p", sock, sk);
549
550 memset(sa, 0, sizeof(*sa));
551 sa->rc_family = AF_BLUETOOTH;
552 sa->rc_channel = rfcomm_pi(sk)->channel;
553 if (peer)
554 bacpy(&sa->rc_bdaddr, &bt_sk(sk)->dst);
555 else
556 bacpy(&sa->rc_bdaddr, &bt_sk(sk)->src);
557
558 *len = sizeof(struct sockaddr_rc);
559 return 0;
560}
561
562static int rfcomm_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
563 struct msghdr *msg, size_t len)
564{
565 struct sock *sk = sock->sk;
566 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
567 struct sk_buff *skb;
568 int sent = 0;
569
570 if (test_bit(RFCOMM_DEFER_SETUP, &d->flags))
571 return -ENOTCONN;
572
573 if (msg->msg_flags & MSG_OOB)
574 return -EOPNOTSUPP;
575
576 if (sk->sk_shutdown & SEND_SHUTDOWN)
577 return -EPIPE;
578
579 BT_DBG("sock %p, sk %p", sock, sk);
580
581 lock_sock(sk);
582
583 while (len) {
584 size_t size = min_t(size_t, len, d->mtu);
585 int err;
586
587 skb = sock_alloc_send_skb(sk, size + RFCOMM_SKB_RESERVE,
588 msg->msg_flags & MSG_DONTWAIT, &err);
589 if (!skb) {
590 if (sent == 0)
591 sent = err;
592 break;
593 }
594 skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
595
596 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
597 if (err) {
598 kfree_skb(skb);
599 if (sent == 0)
600 sent = err;
601 break;
602 }
603
604 skb->priority = sk->sk_priority;
605
606 err = rfcomm_dlc_send(d, skb);
607 if (err < 0) {
608 kfree_skb(skb);
609 if (sent == 0)
610 sent = err;
611 break;
612 }
613
614 sent += size;
615 len -= size;
616 }
617
618 release_sock(sk);
619
620 return sent;
621}
622
623static int rfcomm_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
624 struct msghdr *msg, size_t size, int flags)
625{
626 struct sock *sk = sock->sk;
627 struct rfcomm_dlc *d = rfcomm_pi(sk)->dlc;
628 int len;
629
630 if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) {
631 rfcomm_dlc_accept(d);
632 return 0;
633 }
634
635 len = bt_sock_stream_recvmsg(iocb, sock, msg, size, flags);
636
637 lock_sock(sk);
638 if (!(flags & MSG_PEEK) && len > 0)
639 atomic_sub(len, &sk->sk_rmem_alloc);
640
641 if (atomic_read(&sk->sk_rmem_alloc) <= (sk->sk_rcvbuf >> 2))
642 rfcomm_dlc_unthrottle(rfcomm_pi(sk)->dlc);
643 release_sock(sk);
644
645 return len;
646}
647
648static int rfcomm_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
649{
650 struct sock *sk = sock->sk;
651 int err = 0;
652 u32 opt;
653
654 BT_DBG("sk %p", sk);
655
656 lock_sock(sk);
657
658 switch (optname) {
659 case RFCOMM_LM:
660 if (get_user(opt, (u32 __user *) optval)) {
661 err = -EFAULT;
662 break;
663 }
664
665 if (opt & RFCOMM_LM_AUTH)
666 rfcomm_pi(sk)->sec_level = BT_SECURITY_LOW;
667 if (opt & RFCOMM_LM_ENCRYPT)
668 rfcomm_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
669 if (opt & RFCOMM_LM_SECURE)
670 rfcomm_pi(sk)->sec_level = BT_SECURITY_HIGH;
671
672 rfcomm_pi(sk)->role_switch = (opt & RFCOMM_LM_MASTER);
673 break;
674
675 default:
676 err = -ENOPROTOOPT;
677 break;
678 }
679
680 release_sock(sk);
681 return err;
682}
683
684static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
685{
686 struct sock *sk = sock->sk;
687 struct bt_security sec;
688 int err = 0;
689 size_t len;
690 u32 opt;
691
692 BT_DBG("sk %p", sk);
693
694 if (level == SOL_RFCOMM)
695 return rfcomm_sock_setsockopt_old(sock, optname, optval, optlen);
696
697 if (level != SOL_BLUETOOTH)
698 return -ENOPROTOOPT;
699
700 lock_sock(sk);
701
702 switch (optname) {
703 case BT_SECURITY:
704 if (sk->sk_type != SOCK_STREAM) {
705 err = -EINVAL;
706 break;
707 }
708
709 sec.level = BT_SECURITY_LOW;
710
711 len = min_t(unsigned int, sizeof(sec), optlen);
712 if (copy_from_user((char *) &sec, optval, len)) {
713 err = -EFAULT;
714 break;
715 }
716
717 if (sec.level > BT_SECURITY_HIGH) {
718 err = -EINVAL;
719 break;
720 }
721
722 rfcomm_pi(sk)->sec_level = sec.level;
723 break;
724
725 case BT_DEFER_SETUP:
726 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
727 err = -EINVAL;
728 break;
729 }
730
731 if (get_user(opt, (u32 __user *) optval)) {
732 err = -EFAULT;
733 break;
734 }
735
736 if (opt)
737 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
738 else
739 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
740
741 break;
742
743 default:
744 err = -ENOPROTOOPT;
745 break;
746 }
747
748 release_sock(sk);
749 return err;
750}
751
752static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
753{
754 struct sock *sk = sock->sk;
755 struct rfcomm_conninfo cinfo;
756 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
757 int len, err = 0;
758 u32 opt;
759
760 BT_DBG("sk %p", sk);
761
762 if (get_user(len, optlen))
763 return -EFAULT;
764
765 lock_sock(sk);
766
767 switch (optname) {
768 case RFCOMM_LM:
769 switch (rfcomm_pi(sk)->sec_level) {
770 case BT_SECURITY_LOW:
771 opt = RFCOMM_LM_AUTH;
772 break;
773 case BT_SECURITY_MEDIUM:
774 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT;
775 break;
776 case BT_SECURITY_HIGH:
777 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
778 RFCOMM_LM_SECURE;
779 break;
780 default:
781 opt = 0;
782 break;
783 }
784
785 if (rfcomm_pi(sk)->role_switch)
786 opt |= RFCOMM_LM_MASTER;
787
788 if (put_user(opt, (u32 __user *) optval))
789 err = -EFAULT;
790 break;
791
792 case RFCOMM_CONNINFO:
793 if (sk->sk_state != BT_CONNECTED &&
794 !rfcomm_pi(sk)->dlc->defer_setup) {
795 err = -ENOTCONN;
796 break;
797 }
798
799 memset(&cinfo, 0, sizeof(cinfo));
800 cinfo.hci_handle = conn->hcon->handle;
801 memcpy(cinfo.dev_class, conn->hcon->dev_class, 3);
802
803 len = min_t(unsigned int, len, sizeof(cinfo));
804 if (copy_to_user(optval, (char *) &cinfo, len))
805 err = -EFAULT;
806
807 break;
808
809 default:
810 err = -ENOPROTOOPT;
811 break;
812 }
813
814 release_sock(sk);
815 return err;
816}
817
818static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
819{
820 struct sock *sk = sock->sk;
821 struct bt_security sec;
822 int len, err = 0;
823
824 BT_DBG("sk %p", sk);
825
826 if (level == SOL_RFCOMM)
827 return rfcomm_sock_getsockopt_old(sock, optname, optval, optlen);
828
829 if (level != SOL_BLUETOOTH)
830 return -ENOPROTOOPT;
831
832 if (get_user(len, optlen))
833 return -EFAULT;
834
835 lock_sock(sk);
836
837 switch (optname) {
838 case BT_SECURITY:
839 if (sk->sk_type != SOCK_STREAM) {
840 err = -EINVAL;
841 break;
842 }
843
844 sec.level = rfcomm_pi(sk)->sec_level;
845 sec.key_size = 0;
846
847 len = min_t(unsigned int, len, sizeof(sec));
848 if (copy_to_user(optval, (char *) &sec, len))
849 err = -EFAULT;
850
851 break;
852
853 case BT_DEFER_SETUP:
854 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
855 err = -EINVAL;
856 break;
857 }
858
859 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
860 (u32 __user *) optval))
861 err = -EFAULT;
862
863 break;
864
865 default:
866 err = -ENOPROTOOPT;
867 break;
868 }
869
870 release_sock(sk);
871 return err;
872}
873
874static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
875{
876 struct sock *sk __maybe_unused = sock->sk;
877 int err;
878
879 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
880
881 err = bt_sock_ioctl(sock, cmd, arg);
882
883 if (err == -ENOIOCTLCMD) {
884#ifdef CONFIG_BT_RFCOMM_TTY
885 lock_sock(sk);
886 err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg);
887 release_sock(sk);
888#else
889 err = -EOPNOTSUPP;
890#endif
891 }
892
893 return err;
894}
895
896static int rfcomm_sock_shutdown(struct socket *sock, int how)
897{
898 struct sock *sk = sock->sk;
899 int err = 0;
900
901 BT_DBG("sock %p, sk %p", sock, sk);
902
903 if (!sk)
904 return 0;
905
906 lock_sock(sk);
907 if (!sk->sk_shutdown) {
908 sk->sk_shutdown = SHUTDOWN_MASK;
909 __rfcomm_sock_close(sk);
910
911 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
912 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
913 }
914 release_sock(sk);
915 return err;
916}
917
918static int rfcomm_sock_release(struct socket *sock)
919{
920 struct sock *sk = sock->sk;
921 int err;
922
923 BT_DBG("sock %p, sk %p", sock, sk);
924
925 if (!sk)
926 return 0;
927
928 err = rfcomm_sock_shutdown(sock, 2);
929
930 sock_orphan(sk);
931 rfcomm_sock_kill(sk);
932 return err;
933}
934
935/* ---- RFCOMM core layer callbacks ----
936 *
937 * called under rfcomm_lock()
938 */
939int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
940{
941 struct sock *sk, *parent;
942 bdaddr_t src, dst;
943 int result = 0;
944
945 BT_DBG("session %p channel %d", s, channel);
946
947 rfcomm_session_getaddr(s, &src, &dst);
948
949 /* Check if we have socket listening on channel */
950 parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
951 if (!parent)
952 return 0;
953
954 bh_lock_sock(parent);
955
956 /* Check for backlog size */
957 if (sk_acceptq_is_full(parent)) {
958 BT_DBG("backlog full %d", parent->sk_ack_backlog);
959 goto done;
960 }
961
962 sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC);
963 if (!sk)
964 goto done;
965
966 bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM);
967
968 rfcomm_sock_init(sk, parent);
969 bacpy(&bt_sk(sk)->src, &src);
970 bacpy(&bt_sk(sk)->dst, &dst);
971 rfcomm_pi(sk)->channel = channel;
972
973 sk->sk_state = BT_CONFIG;
974 bt_accept_enqueue(parent, sk);
975
976 /* Accept connection and return socket DLC */
977 *d = rfcomm_pi(sk)->dlc;
978 result = 1;
979
980done:
981 bh_unlock_sock(parent);
982
983 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
984 parent->sk_state_change(parent);
985
986 return result;
987}
988
989static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p)
990{
991 struct sock *sk;
992 struct hlist_node *node;
993
994 read_lock(&rfcomm_sk_list.lock);
995
996 sk_for_each(sk, node, &rfcomm_sk_list.head) {
997 seq_printf(f, "%s %s %d %d\n",
998 batostr(&bt_sk(sk)->src),
999 batostr(&bt_sk(sk)->dst),
1000 sk->sk_state, rfcomm_pi(sk)->channel);
1001 }
1002
1003 read_unlock(&rfcomm_sk_list.lock);
1004
1005 return 0;
1006}
1007
1008static int rfcomm_sock_debugfs_open(struct inode *inode, struct file *file)
1009{
1010 return single_open(file, rfcomm_sock_debugfs_show, inode->i_private);
1011}
1012
1013static const struct file_operations rfcomm_sock_debugfs_fops = {
1014 .open = rfcomm_sock_debugfs_open,
1015 .read = seq_read,
1016 .llseek = seq_lseek,
1017 .release = single_release,
1018};
1019
1020static struct dentry *rfcomm_sock_debugfs;
1021
1022static const struct proto_ops rfcomm_sock_ops = {
1023 .family = PF_BLUETOOTH,
1024 .owner = THIS_MODULE,
1025 .release = rfcomm_sock_release,
1026 .bind = rfcomm_sock_bind,
1027 .connect = rfcomm_sock_connect,
1028 .listen = rfcomm_sock_listen,
1029 .accept = rfcomm_sock_accept,
1030 .getname = rfcomm_sock_getname,
1031 .sendmsg = rfcomm_sock_sendmsg,
1032 .recvmsg = rfcomm_sock_recvmsg,
1033 .shutdown = rfcomm_sock_shutdown,
1034 .setsockopt = rfcomm_sock_setsockopt,
1035 .getsockopt = rfcomm_sock_getsockopt,
1036 .ioctl = rfcomm_sock_ioctl,
1037 .poll = bt_sock_poll,
1038 .socketpair = sock_no_socketpair,
1039 .mmap = sock_no_mmap
1040};
1041
1042static const struct net_proto_family rfcomm_sock_family_ops = {
1043 .family = PF_BLUETOOTH,
1044 .owner = THIS_MODULE,
1045 .create = rfcomm_sock_create
1046};
1047
1048int __init rfcomm_init_sockets(void)
1049{
1050 int err;
1051
1052 err = proto_register(&rfcomm_proto, 0);
1053 if (err < 0)
1054 return err;
1055
1056 err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
1057 if (err < 0)
1058 goto error;
1059
1060 if (bt_debugfs) {
1061 rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444,
1062 bt_debugfs, NULL, &rfcomm_sock_debugfs_fops);
1063 if (!rfcomm_sock_debugfs)
1064 BT_ERR("Failed to create RFCOMM debug file");
1065 }
1066
1067 BT_INFO("RFCOMM socket layer initialized");
1068
1069 return 0;
1070
1071error:
1072 BT_ERR("RFCOMM socket layer registration failed");
1073 proto_unregister(&rfcomm_proto);
1074 return err;
1075}
1076
1077void __exit rfcomm_cleanup_sockets(void)
1078{
1079 debugfs_remove(rfcomm_sock_debugfs);
1080
1081 if (bt_sock_unregister(BTPROTO_RFCOMM) < 0)
1082 BT_ERR("RFCOMM socket layer unregistration failed");
1083
1084 proto_unregister(&rfcomm_proto);
1085}