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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#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 (copy_from_sockptr(&opt, optval, sizeof(u32))) {
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 size_t len;
668 u32 opt;
669
670 BT_DBG("sk %p", sk);
671
672 if (level == SOL_RFCOMM)
673 return rfcomm_sock_setsockopt_old(sock, optname, optval, optlen);
674
675 if (level != SOL_BLUETOOTH)
676 return -ENOPROTOOPT;
677
678 lock_sock(sk);
679
680 switch (optname) {
681 case BT_SECURITY:
682 if (sk->sk_type != SOCK_STREAM) {
683 err = -EINVAL;
684 break;
685 }
686
687 sec.level = BT_SECURITY_LOW;
688
689 len = min_t(unsigned int, sizeof(sec), optlen);
690 if (copy_from_sockptr(&sec, optval, len)) {
691 err = -EFAULT;
692 break;
693 }
694
695 if (sec.level > BT_SECURITY_HIGH) {
696 err = -EINVAL;
697 break;
698 }
699
700 rfcomm_pi(sk)->sec_level = sec.level;
701 break;
702
703 case BT_DEFER_SETUP:
704 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
705 err = -EINVAL;
706 break;
707 }
708
709 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
710 err = -EFAULT;
711 break;
712 }
713
714 if (opt)
715 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
716 else
717 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
718
719 break;
720
721 default:
722 err = -ENOPROTOOPT;
723 break;
724 }
725
726 release_sock(sk);
727 return err;
728}
729
730static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
731{
732 struct sock *sk = sock->sk;
733 struct sock *l2cap_sk;
734 struct l2cap_conn *conn;
735 struct rfcomm_conninfo cinfo;
736 int len, err = 0;
737 u32 opt;
738
739 BT_DBG("sk %p", sk);
740
741 if (get_user(len, optlen))
742 return -EFAULT;
743
744 lock_sock(sk);
745
746 switch (optname) {
747 case RFCOMM_LM:
748 switch (rfcomm_pi(sk)->sec_level) {
749 case BT_SECURITY_LOW:
750 opt = RFCOMM_LM_AUTH;
751 break;
752 case BT_SECURITY_MEDIUM:
753 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT;
754 break;
755 case BT_SECURITY_HIGH:
756 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
757 RFCOMM_LM_SECURE;
758 break;
759 case BT_SECURITY_FIPS:
760 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
761 RFCOMM_LM_SECURE | RFCOMM_LM_FIPS;
762 break;
763 default:
764 opt = 0;
765 break;
766 }
767
768 if (rfcomm_pi(sk)->role_switch)
769 opt |= RFCOMM_LM_MASTER;
770
771 if (put_user(opt, (u32 __user *) optval))
772 err = -EFAULT;
773
774 break;
775
776 case RFCOMM_CONNINFO:
777 if (sk->sk_state != BT_CONNECTED &&
778 !rfcomm_pi(sk)->dlc->defer_setup) {
779 err = -ENOTCONN;
780 break;
781 }
782
783 l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
784 conn = l2cap_pi(l2cap_sk)->chan->conn;
785
786 memset(&cinfo, 0, sizeof(cinfo));
787 cinfo.hci_handle = conn->hcon->handle;
788 memcpy(cinfo.dev_class, conn->hcon->dev_class, 3);
789
790 len = min_t(unsigned int, len, sizeof(cinfo));
791 if (copy_to_user(optval, (char *) &cinfo, len))
792 err = -EFAULT;
793
794 break;
795
796 default:
797 err = -ENOPROTOOPT;
798 break;
799 }
800
801 release_sock(sk);
802 return err;
803}
804
805static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
806{
807 struct sock *sk = sock->sk;
808 struct bt_security sec;
809 int len, err = 0;
810
811 BT_DBG("sk %p", sk);
812
813 if (level == SOL_RFCOMM)
814 return rfcomm_sock_getsockopt_old(sock, optname, optval, optlen);
815
816 if (level != SOL_BLUETOOTH)
817 return -ENOPROTOOPT;
818
819 if (get_user(len, optlen))
820 return -EFAULT;
821
822 lock_sock(sk);
823
824 switch (optname) {
825 case BT_SECURITY:
826 if (sk->sk_type != SOCK_STREAM) {
827 err = -EINVAL;
828 break;
829 }
830
831 sec.level = rfcomm_pi(sk)->sec_level;
832 sec.key_size = 0;
833
834 len = min_t(unsigned int, len, sizeof(sec));
835 if (copy_to_user(optval, (char *) &sec, len))
836 err = -EFAULT;
837
838 break;
839
840 case BT_DEFER_SETUP:
841 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
842 err = -EINVAL;
843 break;
844 }
845
846 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
847 (u32 __user *) optval))
848 err = -EFAULT;
849
850 break;
851
852 default:
853 err = -ENOPROTOOPT;
854 break;
855 }
856
857 release_sock(sk);
858 return err;
859}
860
861static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
862{
863 struct sock *sk __maybe_unused = sock->sk;
864 int err;
865
866 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
867
868 err = bt_sock_ioctl(sock, cmd, arg);
869
870 if (err == -ENOIOCTLCMD) {
871#ifdef CONFIG_BT_RFCOMM_TTY
872 lock_sock(sk);
873 err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg);
874 release_sock(sk);
875#else
876 err = -EOPNOTSUPP;
877#endif
878 }
879
880 return err;
881}
882
883#ifdef CONFIG_COMPAT
884static int rfcomm_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
885{
886 return rfcomm_sock_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
887}
888#endif
889
890static int rfcomm_sock_shutdown(struct socket *sock, int how)
891{
892 struct sock *sk = sock->sk;
893 int err = 0;
894
895 BT_DBG("sock %p, sk %p", sock, sk);
896
897 if (!sk)
898 return 0;
899
900 lock_sock(sk);
901 if (!sk->sk_shutdown) {
902 sk->sk_shutdown = SHUTDOWN_MASK;
903
904 release_sock(sk);
905 __rfcomm_sock_close(sk);
906 lock_sock(sk);
907
908 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
909 !(current->flags & PF_EXITING))
910 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
911 }
912 release_sock(sk);
913 return err;
914}
915
916static int rfcomm_sock_release(struct socket *sock)
917{
918 struct sock *sk = sock->sk;
919 int err;
920
921 BT_DBG("sock %p, sk %p", sock, sk);
922
923 if (!sk)
924 return 0;
925
926 err = rfcomm_sock_shutdown(sock, 2);
927
928 sock_orphan(sk);
929 rfcomm_sock_kill(sk);
930 return err;
931}
932
933/* ---- RFCOMM core layer callbacks ----
934 *
935 * called under rfcomm_lock()
936 */
937int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
938{
939 struct sock *sk, *parent;
940 bdaddr_t src, dst;
941 int result = 0;
942
943 BT_DBG("session %p channel %d", s, channel);
944
945 rfcomm_session_getaddr(s, &src, &dst);
946
947 /* Check if we have socket listening on channel */
948 parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
949 if (!parent)
950 return 0;
951
952 lock_sock(parent);
953
954 /* Check for backlog size */
955 if (sk_acceptq_is_full(parent)) {
956 BT_DBG("backlog full %d", parent->sk_ack_backlog);
957 goto done;
958 }
959
960 sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC, 0);
961 if (!sk)
962 goto done;
963
964 bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM);
965
966 rfcomm_sock_init(sk, parent);
967 bacpy(&rfcomm_pi(sk)->src, &src);
968 bacpy(&rfcomm_pi(sk)->dst, &dst);
969 rfcomm_pi(sk)->channel = channel;
970
971 sk->sk_state = BT_CONFIG;
972 bt_accept_enqueue(parent, sk, true);
973
974 /* Accept connection and return socket DLC */
975 *d = rfcomm_pi(sk)->dlc;
976 result = 1;
977
978done:
979 release_sock(parent);
980
981 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
982 parent->sk_state_change(parent);
983
984 return result;
985}
986
987static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p)
988{
989 struct sock *sk;
990
991 read_lock(&rfcomm_sk_list.lock);
992
993 sk_for_each(sk, &rfcomm_sk_list.head) {
994 seq_printf(f, "%pMR %pMR %d %d\n",
995 &rfcomm_pi(sk)->src, &rfcomm_pi(sk)->dst,
996 sk->sk_state, rfcomm_pi(sk)->channel);
997 }
998
999 read_unlock(&rfcomm_sk_list.lock);
1000
1001 return 0;
1002}
1003
1004DEFINE_SHOW_ATTRIBUTE(rfcomm_sock_debugfs);
1005
1006static struct dentry *rfcomm_sock_debugfs;
1007
1008static const struct proto_ops rfcomm_sock_ops = {
1009 .family = PF_BLUETOOTH,
1010 .owner = THIS_MODULE,
1011 .release = rfcomm_sock_release,
1012 .bind = rfcomm_sock_bind,
1013 .connect = rfcomm_sock_connect,
1014 .listen = rfcomm_sock_listen,
1015 .accept = rfcomm_sock_accept,
1016 .getname = rfcomm_sock_getname,
1017 .sendmsg = rfcomm_sock_sendmsg,
1018 .recvmsg = rfcomm_sock_recvmsg,
1019 .shutdown = rfcomm_sock_shutdown,
1020 .setsockopt = rfcomm_sock_setsockopt,
1021 .getsockopt = rfcomm_sock_getsockopt,
1022 .ioctl = rfcomm_sock_ioctl,
1023 .gettstamp = sock_gettstamp,
1024 .poll = bt_sock_poll,
1025 .socketpair = sock_no_socketpair,
1026 .mmap = sock_no_mmap,
1027#ifdef CONFIG_COMPAT
1028 .compat_ioctl = rfcomm_sock_compat_ioctl,
1029#endif
1030};
1031
1032static const struct net_proto_family rfcomm_sock_family_ops = {
1033 .family = PF_BLUETOOTH,
1034 .owner = THIS_MODULE,
1035 .create = rfcomm_sock_create
1036};
1037
1038int __init rfcomm_init_sockets(void)
1039{
1040 int err;
1041
1042 BUILD_BUG_ON(sizeof(struct sockaddr_rc) > sizeof(struct sockaddr));
1043
1044 err = proto_register(&rfcomm_proto, 0);
1045 if (err < 0)
1046 return err;
1047
1048 err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
1049 if (err < 0) {
1050 BT_ERR("RFCOMM socket layer registration failed");
1051 goto error;
1052 }
1053
1054 err = bt_procfs_init(&init_net, "rfcomm", &rfcomm_sk_list, NULL);
1055 if (err < 0) {
1056 BT_ERR("Failed to create RFCOMM proc file");
1057 bt_sock_unregister(BTPROTO_RFCOMM);
1058 goto error;
1059 }
1060
1061 BT_INFO("RFCOMM socket layer initialized");
1062
1063 if (IS_ERR_OR_NULL(bt_debugfs))
1064 return 0;
1065
1066 rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444,
1067 bt_debugfs, NULL,
1068 &rfcomm_sock_debugfs_fops);
1069
1070 return 0;
1071
1072error:
1073 proto_unregister(&rfcomm_proto);
1074 return err;
1075}
1076
1077void __exit rfcomm_cleanup_sockets(void)
1078{
1079 bt_procfs_cleanup(&init_net, "rfcomm");
1080
1081 debugfs_remove(rfcomm_sock_debugfs);
1082
1083 bt_sock_unregister(BTPROTO_RFCOMM);
1084
1085 proto_unregister(&rfcomm_proto);
1086}
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 spin_lock_bh(&sk->sk_lock.slock);
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 spin_unlock_bh(&sk->sk_lock.slock);
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, int proto, gfp_t prio, int kern)
272{
273 struct rfcomm_dlc *d;
274 struct sock *sk;
275
276 sk = sk_alloc(net, PF_BLUETOOTH, prio, &rfcomm_proto, kern);
277 if (!sk)
278 return NULL;
279
280 sock_init_data(sock, sk);
281 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
282
283 d = rfcomm_dlc_alloc(prio);
284 if (!d) {
285 sk_free(sk);
286 return NULL;
287 }
288
289 d->data_ready = rfcomm_sk_data_ready;
290 d->state_change = rfcomm_sk_state_change;
291
292 rfcomm_pi(sk)->dlc = d;
293 d->owner = sk;
294
295 sk->sk_destruct = rfcomm_sock_destruct;
296 sk->sk_sndtimeo = RFCOMM_CONN_TIMEOUT;
297
298 sk->sk_sndbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
299 sk->sk_rcvbuf = RFCOMM_MAX_CREDITS * RFCOMM_DEFAULT_MTU * 10;
300
301 sock_reset_flag(sk, SOCK_ZAPPED);
302
303 sk->sk_protocol = proto;
304 sk->sk_state = BT_OPEN;
305
306 bt_sock_link(&rfcomm_sk_list, sk);
307
308 BT_DBG("sk %p", sk);
309 return sk;
310}
311
312static int rfcomm_sock_create(struct net *net, struct socket *sock,
313 int protocol, int kern)
314{
315 struct sock *sk;
316
317 BT_DBG("sock %p", sock);
318
319 sock->state = SS_UNCONNECTED;
320
321 if (sock->type != SOCK_STREAM && sock->type != SOCK_RAW)
322 return -ESOCKTNOSUPPORT;
323
324 sock->ops = &rfcomm_sock_ops;
325
326 sk = rfcomm_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
327 if (!sk)
328 return -ENOMEM;
329
330 rfcomm_sock_init(sk, NULL);
331 return 0;
332}
333
334static int rfcomm_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
335{
336 struct sockaddr_rc sa;
337 struct sock *sk = sock->sk;
338 int len, err = 0;
339
340 if (!addr || addr_len < offsetofend(struct sockaddr, sa_family) ||
341 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 bool kern)
475{
476 DEFINE_WAIT_FUNC(wait, woken_wake_function);
477 struct sock *sk = sock->sk, *nsk;
478 long timeo;
479 int err = 0;
480
481 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
482
483 if (sk->sk_type != SOCK_STREAM) {
484 err = -EINVAL;
485 goto done;
486 }
487
488 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
489
490 BT_DBG("sk %p timeo %ld", sk, timeo);
491
492 /* Wait for an incoming connection. (wake-one). */
493 add_wait_queue_exclusive(sk_sleep(sk), &wait);
494 while (1) {
495 if (sk->sk_state != BT_LISTEN) {
496 err = -EBADFD;
497 break;
498 }
499
500 nsk = bt_accept_dequeue(sk, newsock);
501 if (nsk)
502 break;
503
504 if (!timeo) {
505 err = -EAGAIN;
506 break;
507 }
508
509 if (signal_pending(current)) {
510 err = sock_intr_errno(timeo);
511 break;
512 }
513
514 release_sock(sk);
515
516 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
517
518 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
519 }
520 remove_wait_queue(sk_sleep(sk), &wait);
521
522 if (err)
523 goto done;
524
525 newsock->state = SS_CONNECTED;
526
527 BT_DBG("new socket %p", nsk);
528
529done:
530 release_sock(sk);
531 return err;
532}
533
534static int rfcomm_sock_getname(struct socket *sock, struct sockaddr *addr, int peer)
535{
536 struct sockaddr_rc *sa = (struct sockaddr_rc *) addr;
537 struct sock *sk = sock->sk;
538
539 BT_DBG("sock %p, sk %p", sock, sk);
540
541 if (peer && sk->sk_state != BT_CONNECTED &&
542 sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2)
543 return -ENOTCONN;
544
545 memset(sa, 0, sizeof(*sa));
546 sa->rc_family = AF_BLUETOOTH;
547 sa->rc_channel = rfcomm_pi(sk)->channel;
548 if (peer)
549 bacpy(&sa->rc_bdaddr, &rfcomm_pi(sk)->dst);
550 else
551 bacpy(&sa->rc_bdaddr, &rfcomm_pi(sk)->src);
552
553 return sizeof(struct sockaddr_rc);
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,
648 sockptr_t 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 (copy_from_sockptr(&opt, optval, sizeof(u32))) {
661 err = -EFAULT;
662 break;
663 }
664
665 if (opt & RFCOMM_LM_FIPS) {
666 err = -EINVAL;
667 break;
668 }
669
670 if (opt & RFCOMM_LM_AUTH)
671 rfcomm_pi(sk)->sec_level = BT_SECURITY_LOW;
672 if (opt & RFCOMM_LM_ENCRYPT)
673 rfcomm_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
674 if (opt & RFCOMM_LM_SECURE)
675 rfcomm_pi(sk)->sec_level = BT_SECURITY_HIGH;
676
677 rfcomm_pi(sk)->role_switch = (opt & RFCOMM_LM_MASTER);
678 break;
679
680 default:
681 err = -ENOPROTOOPT;
682 break;
683 }
684
685 release_sock(sk);
686 return err;
687}
688
689static int rfcomm_sock_setsockopt(struct socket *sock, int level, int optname,
690 sockptr_t optval, unsigned int optlen)
691{
692 struct sock *sk = sock->sk;
693 struct bt_security sec;
694 int err = 0;
695 size_t len;
696 u32 opt;
697
698 BT_DBG("sk %p", sk);
699
700 if (level == SOL_RFCOMM)
701 return rfcomm_sock_setsockopt_old(sock, optname, optval, optlen);
702
703 if (level != SOL_BLUETOOTH)
704 return -ENOPROTOOPT;
705
706 lock_sock(sk);
707
708 switch (optname) {
709 case BT_SECURITY:
710 if (sk->sk_type != SOCK_STREAM) {
711 err = -EINVAL;
712 break;
713 }
714
715 sec.level = BT_SECURITY_LOW;
716
717 len = min_t(unsigned int, sizeof(sec), optlen);
718 if (copy_from_sockptr(&sec, optval, len)) {
719 err = -EFAULT;
720 break;
721 }
722
723 if (sec.level > BT_SECURITY_HIGH) {
724 err = -EINVAL;
725 break;
726 }
727
728 rfcomm_pi(sk)->sec_level = sec.level;
729 break;
730
731 case BT_DEFER_SETUP:
732 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
733 err = -EINVAL;
734 break;
735 }
736
737 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
738 err = -EFAULT;
739 break;
740 }
741
742 if (opt)
743 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
744 else
745 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
746
747 break;
748
749 default:
750 err = -ENOPROTOOPT;
751 break;
752 }
753
754 release_sock(sk);
755 return err;
756}
757
758static int rfcomm_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
759{
760 struct sock *sk = sock->sk;
761 struct sock *l2cap_sk;
762 struct l2cap_conn *conn;
763 struct rfcomm_conninfo cinfo;
764 int len, err = 0;
765 u32 opt;
766
767 BT_DBG("sk %p", sk);
768
769 if (get_user(len, optlen))
770 return -EFAULT;
771
772 lock_sock(sk);
773
774 switch (optname) {
775 case RFCOMM_LM:
776 switch (rfcomm_pi(sk)->sec_level) {
777 case BT_SECURITY_LOW:
778 opt = RFCOMM_LM_AUTH;
779 break;
780 case BT_SECURITY_MEDIUM:
781 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT;
782 break;
783 case BT_SECURITY_HIGH:
784 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
785 RFCOMM_LM_SECURE;
786 break;
787 case BT_SECURITY_FIPS:
788 opt = RFCOMM_LM_AUTH | RFCOMM_LM_ENCRYPT |
789 RFCOMM_LM_SECURE | RFCOMM_LM_FIPS;
790 break;
791 default:
792 opt = 0;
793 break;
794 }
795
796 if (rfcomm_pi(sk)->role_switch)
797 opt |= RFCOMM_LM_MASTER;
798
799 if (put_user(opt, (u32 __user *) optval))
800 err = -EFAULT;
801
802 break;
803
804 case RFCOMM_CONNINFO:
805 if (sk->sk_state != BT_CONNECTED &&
806 !rfcomm_pi(sk)->dlc->defer_setup) {
807 err = -ENOTCONN;
808 break;
809 }
810
811 l2cap_sk = rfcomm_pi(sk)->dlc->session->sock->sk;
812 conn = l2cap_pi(l2cap_sk)->chan->conn;
813
814 memset(&cinfo, 0, sizeof(cinfo));
815 cinfo.hci_handle = conn->hcon->handle;
816 memcpy(cinfo.dev_class, conn->hcon->dev_class, 3);
817
818 len = min_t(unsigned int, len, sizeof(cinfo));
819 if (copy_to_user(optval, (char *) &cinfo, len))
820 err = -EFAULT;
821
822 break;
823
824 default:
825 err = -ENOPROTOOPT;
826 break;
827 }
828
829 release_sock(sk);
830 return err;
831}
832
833static int rfcomm_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
834{
835 struct sock *sk = sock->sk;
836 struct bt_security sec;
837 int len, err = 0;
838
839 BT_DBG("sk %p", sk);
840
841 if (level == SOL_RFCOMM)
842 return rfcomm_sock_getsockopt_old(sock, optname, optval, optlen);
843
844 if (level != SOL_BLUETOOTH)
845 return -ENOPROTOOPT;
846
847 if (get_user(len, optlen))
848 return -EFAULT;
849
850 lock_sock(sk);
851
852 switch (optname) {
853 case BT_SECURITY:
854 if (sk->sk_type != SOCK_STREAM) {
855 err = -EINVAL;
856 break;
857 }
858
859 sec.level = rfcomm_pi(sk)->sec_level;
860 sec.key_size = 0;
861
862 len = min_t(unsigned int, len, sizeof(sec));
863 if (copy_to_user(optval, (char *) &sec, len))
864 err = -EFAULT;
865
866 break;
867
868 case BT_DEFER_SETUP:
869 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
870 err = -EINVAL;
871 break;
872 }
873
874 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
875 (u32 __user *) optval))
876 err = -EFAULT;
877
878 break;
879
880 default:
881 err = -ENOPROTOOPT;
882 break;
883 }
884
885 release_sock(sk);
886 return err;
887}
888
889static int rfcomm_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
890{
891 struct sock *sk __maybe_unused = sock->sk;
892 int err;
893
894 BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
895
896 err = bt_sock_ioctl(sock, cmd, arg);
897
898 if (err == -ENOIOCTLCMD) {
899#ifdef CONFIG_BT_RFCOMM_TTY
900 lock_sock(sk);
901 err = rfcomm_dev_ioctl(sk, cmd, (void __user *) arg);
902 release_sock(sk);
903#else
904 err = -EOPNOTSUPP;
905#endif
906 }
907
908 return err;
909}
910
911#ifdef CONFIG_COMPAT
912static int rfcomm_sock_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
913{
914 return rfcomm_sock_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
915}
916#endif
917
918static int rfcomm_sock_shutdown(struct socket *sock, int how)
919{
920 struct sock *sk = sock->sk;
921 int err = 0;
922
923 BT_DBG("sock %p, sk %p", sock, sk);
924
925 if (!sk)
926 return 0;
927
928 lock_sock(sk);
929 if (!sk->sk_shutdown) {
930 sk->sk_shutdown = SHUTDOWN_MASK;
931 __rfcomm_sock_close(sk);
932
933 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
934 !(current->flags & PF_EXITING))
935 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
936 }
937 release_sock(sk);
938 return err;
939}
940
941static int rfcomm_sock_release(struct socket *sock)
942{
943 struct sock *sk = sock->sk;
944 int err;
945
946 BT_DBG("sock %p, sk %p", sock, sk);
947
948 if (!sk)
949 return 0;
950
951 err = rfcomm_sock_shutdown(sock, 2);
952
953 sock_orphan(sk);
954 rfcomm_sock_kill(sk);
955 return err;
956}
957
958/* ---- RFCOMM core layer callbacks ----
959 *
960 * called under rfcomm_lock()
961 */
962int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc **d)
963{
964 struct sock *sk, *parent;
965 bdaddr_t src, dst;
966 int result = 0;
967
968 BT_DBG("session %p channel %d", s, channel);
969
970 rfcomm_session_getaddr(s, &src, &dst);
971
972 /* Check if we have socket listening on channel */
973 parent = rfcomm_get_sock_by_channel(BT_LISTEN, channel, &src);
974 if (!parent)
975 return 0;
976
977 bh_lock_sock(parent);
978
979 /* Check for backlog size */
980 if (sk_acceptq_is_full(parent)) {
981 BT_DBG("backlog full %d", parent->sk_ack_backlog);
982 goto done;
983 }
984
985 sk = rfcomm_sock_alloc(sock_net(parent), NULL, BTPROTO_RFCOMM, GFP_ATOMIC, 0);
986 if (!sk)
987 goto done;
988
989 bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM);
990
991 rfcomm_sock_init(sk, parent);
992 bacpy(&rfcomm_pi(sk)->src, &src);
993 bacpy(&rfcomm_pi(sk)->dst, &dst);
994 rfcomm_pi(sk)->channel = channel;
995
996 sk->sk_state = BT_CONFIG;
997 bt_accept_enqueue(parent, sk, true);
998
999 /* Accept connection and return socket DLC */
1000 *d = rfcomm_pi(sk)->dlc;
1001 result = 1;
1002
1003done:
1004 bh_unlock_sock(parent);
1005
1006 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1007 parent->sk_state_change(parent);
1008
1009 return result;
1010}
1011
1012static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p)
1013{
1014 struct sock *sk;
1015
1016 read_lock(&rfcomm_sk_list.lock);
1017
1018 sk_for_each(sk, &rfcomm_sk_list.head) {
1019 seq_printf(f, "%pMR %pMR %d %d\n",
1020 &rfcomm_pi(sk)->src, &rfcomm_pi(sk)->dst,
1021 sk->sk_state, rfcomm_pi(sk)->channel);
1022 }
1023
1024 read_unlock(&rfcomm_sk_list.lock);
1025
1026 return 0;
1027}
1028
1029DEFINE_SHOW_ATTRIBUTE(rfcomm_sock_debugfs);
1030
1031static struct dentry *rfcomm_sock_debugfs;
1032
1033static const struct proto_ops rfcomm_sock_ops = {
1034 .family = PF_BLUETOOTH,
1035 .owner = THIS_MODULE,
1036 .release = rfcomm_sock_release,
1037 .bind = rfcomm_sock_bind,
1038 .connect = rfcomm_sock_connect,
1039 .listen = rfcomm_sock_listen,
1040 .accept = rfcomm_sock_accept,
1041 .getname = rfcomm_sock_getname,
1042 .sendmsg = rfcomm_sock_sendmsg,
1043 .recvmsg = rfcomm_sock_recvmsg,
1044 .shutdown = rfcomm_sock_shutdown,
1045 .setsockopt = rfcomm_sock_setsockopt,
1046 .getsockopt = rfcomm_sock_getsockopt,
1047 .ioctl = rfcomm_sock_ioctl,
1048 .gettstamp = sock_gettstamp,
1049 .poll = bt_sock_poll,
1050 .socketpair = sock_no_socketpair,
1051 .mmap = sock_no_mmap,
1052#ifdef CONFIG_COMPAT
1053 .compat_ioctl = rfcomm_sock_compat_ioctl,
1054#endif
1055};
1056
1057static const struct net_proto_family rfcomm_sock_family_ops = {
1058 .family = PF_BLUETOOTH,
1059 .owner = THIS_MODULE,
1060 .create = rfcomm_sock_create
1061};
1062
1063int __init rfcomm_init_sockets(void)
1064{
1065 int err;
1066
1067 BUILD_BUG_ON(sizeof(struct sockaddr_rc) > sizeof(struct sockaddr));
1068
1069 err = proto_register(&rfcomm_proto, 0);
1070 if (err < 0)
1071 return err;
1072
1073 err = bt_sock_register(BTPROTO_RFCOMM, &rfcomm_sock_family_ops);
1074 if (err < 0) {
1075 BT_ERR("RFCOMM socket layer registration failed");
1076 goto error;
1077 }
1078
1079 err = bt_procfs_init(&init_net, "rfcomm", &rfcomm_sk_list, NULL);
1080 if (err < 0) {
1081 BT_ERR("Failed to create RFCOMM proc file");
1082 bt_sock_unregister(BTPROTO_RFCOMM);
1083 goto error;
1084 }
1085
1086 BT_INFO("RFCOMM socket layer initialized");
1087
1088 if (IS_ERR_OR_NULL(bt_debugfs))
1089 return 0;
1090
1091 rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444,
1092 bt_debugfs, NULL,
1093 &rfcomm_sock_debugfs_fops);
1094
1095 return 0;
1096
1097error:
1098 proto_unregister(&rfcomm_proto);
1099 return err;
1100}
1101
1102void __exit rfcomm_cleanup_sockets(void)
1103{
1104 bt_procfs_cleanup(&init_net, "rfcomm");
1105
1106 debugfs_remove(rfcomm_sock_debugfs);
1107
1108 bt_sock_unregister(BTPROTO_RFCOMM);
1109
1110 proto_unregister(&rfcomm_proto);
1111}