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