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TOMOYO Linux Cross Reference
Linux/net/bluetooth/sco.c

Version: ~ [ linux-5.12 ] ~ [ linux-5.11.16 ] ~ [ linux-5.10.32 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.114 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.188 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.231 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.267 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.267 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2    BlueZ - Bluetooth protocol stack for Linux
  3    Copyright (C) 2000-2001 Qualcomm Incorporated
  4 
  5    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
  6 
  7    This program is free software; you can redistribute it and/or modify
  8    it under the terms of the GNU General Public License version 2 as
  9    published by the Free Software Foundation;
 10 
 11    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 12    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 13    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
 14    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
 15    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
 16    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 17    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 18    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 19 
 20    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
 21    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
 22    SOFTWARE IS DISCLAIMED.
 23 */
 24 
 25 /* Bluetooth SCO sockets. */
 26 
 27 #include <linux/module.h>
 28 #include <linux/debugfs.h>
 29 #include <linux/seq_file.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/sco.h>
 35 
 36 static bool disable_esco;
 37 
 38 static const struct proto_ops sco_sock_ops;
 39 
 40 static struct bt_sock_list sco_sk_list = {
 41         .lock = __RW_LOCK_UNLOCKED(sco_sk_list.lock)
 42 };
 43 
 44 /* ---- SCO connections ---- */
 45 struct sco_conn {
 46         struct hci_conn *hcon;
 47 
 48         spinlock_t      lock;
 49         struct sock     *sk;
 50 
 51         unsigned int    mtu;
 52 };
 53 
 54 #define sco_conn_lock(c)        spin_lock(&c->lock);
 55 #define sco_conn_unlock(c)      spin_unlock(&c->lock);
 56 
 57 static void sco_sock_close(struct sock *sk);
 58 static void sco_sock_kill(struct sock *sk);
 59 
 60 /* ----- SCO socket info ----- */
 61 #define sco_pi(sk) ((struct sco_pinfo *) sk)
 62 
 63 struct sco_pinfo {
 64         struct bt_sock  bt;
 65         bdaddr_t        src;
 66         bdaddr_t        dst;
 67         __u32           flags;
 68         __u16           setting;
 69         struct sco_conn *conn;
 70 };
 71 
 72 /* ---- SCO timers ---- */
 73 #define SCO_CONN_TIMEOUT        (HZ * 40)
 74 #define SCO_DISCONN_TIMEOUT     (HZ * 2)
 75 
 76 static void sco_sock_timeout(struct timer_list *t)
 77 {
 78         struct sock *sk = from_timer(sk, t, sk_timer);
 79 
 80         BT_DBG("sock %p state %d", sk, sk->sk_state);
 81 
 82         bh_lock_sock(sk);
 83         sk->sk_err = ETIMEDOUT;
 84         sk->sk_state_change(sk);
 85         bh_unlock_sock(sk);
 86 
 87         sco_sock_kill(sk);
 88         sock_put(sk);
 89 }
 90 
 91 static void sco_sock_set_timer(struct sock *sk, long timeout)
 92 {
 93         BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
 94         sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
 95 }
 96 
 97 static void sco_sock_clear_timer(struct sock *sk)
 98 {
 99         BT_DBG("sock %p state %d", sk, sk->sk_state);
100         sk_stop_timer(sk, &sk->sk_timer);
101 }
102 
103 /* ---- SCO connections ---- */
104 static struct sco_conn *sco_conn_add(struct hci_conn *hcon)
105 {
106         struct hci_dev *hdev = hcon->hdev;
107         struct sco_conn *conn = hcon->sco_data;
108 
109         if (conn)
110                 return conn;
111 
112         conn = kzalloc(sizeof(struct sco_conn), GFP_KERNEL);
113         if (!conn)
114                 return NULL;
115 
116         spin_lock_init(&conn->lock);
117 
118         hcon->sco_data = conn;
119         conn->hcon = hcon;
120 
121         if (hdev->sco_mtu > 0)
122                 conn->mtu = hdev->sco_mtu;
123         else
124                 conn->mtu = 60;
125 
126         BT_DBG("hcon %p conn %p", hcon, conn);
127 
128         return conn;
129 }
130 
131 /* Delete channel.
132  * Must be called on the locked socket. */
133 static void sco_chan_del(struct sock *sk, int err)
134 {
135         struct sco_conn *conn;
136 
137         conn = sco_pi(sk)->conn;
138 
139         BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
140 
141         if (conn) {
142                 sco_conn_lock(conn);
143                 conn->sk = NULL;
144                 sco_pi(sk)->conn = NULL;
145                 sco_conn_unlock(conn);
146 
147                 if (conn->hcon)
148                         hci_conn_drop(conn->hcon);
149         }
150 
151         sk->sk_state = BT_CLOSED;
152         sk->sk_err   = err;
153         sk->sk_state_change(sk);
154 
155         sock_set_flag(sk, SOCK_ZAPPED);
156 }
157 
158 static void sco_conn_del(struct hci_conn *hcon, int err)
159 {
160         struct sco_conn *conn = hcon->sco_data;
161         struct sock *sk;
162 
163         if (!conn)
164                 return;
165 
166         BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
167 
168         /* Kill socket */
169         sco_conn_lock(conn);
170         sk = conn->sk;
171         sco_conn_unlock(conn);
172 
173         if (sk) {
174                 sock_hold(sk);
175                 bh_lock_sock(sk);
176                 sco_sock_clear_timer(sk);
177                 sco_chan_del(sk, err);
178                 bh_unlock_sock(sk);
179                 sco_sock_kill(sk);
180                 sock_put(sk);
181         }
182 
183         hcon->sco_data = NULL;
184         kfree(conn);
185 }
186 
187 static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
188                            struct sock *parent)
189 {
190         BT_DBG("conn %p", conn);
191 
192         sco_pi(sk)->conn = conn;
193         conn->sk = sk;
194 
195         if (parent)
196                 bt_accept_enqueue(parent, sk);
197 }
198 
199 static int sco_chan_add(struct sco_conn *conn, struct sock *sk,
200                         struct sock *parent)
201 {
202         int err = 0;
203 
204         sco_conn_lock(conn);
205         if (conn->sk)
206                 err = -EBUSY;
207         else
208                 __sco_chan_add(conn, sk, parent);
209 
210         sco_conn_unlock(conn);
211         return err;
212 }
213 
214 static int sco_connect(struct sock *sk)
215 {
216         struct sco_conn *conn;
217         struct hci_conn *hcon;
218         struct hci_dev  *hdev;
219         int err, type;
220 
221         BT_DBG("%pMR -> %pMR", &sco_pi(sk)->src, &sco_pi(sk)->dst);
222 
223         hdev = hci_get_route(&sco_pi(sk)->dst, &sco_pi(sk)->src, BDADDR_BREDR);
224         if (!hdev)
225                 return -EHOSTUNREACH;
226 
227         hci_dev_lock(hdev);
228 
229         if (lmp_esco_capable(hdev) && !disable_esco)
230                 type = ESCO_LINK;
231         else
232                 type = SCO_LINK;
233 
234         if (sco_pi(sk)->setting == BT_VOICE_TRANSPARENT &&
235             (!lmp_transp_capable(hdev) || !lmp_esco_capable(hdev))) {
236                 err = -EOPNOTSUPP;
237                 goto done;
238         }
239 
240         hcon = hci_connect_sco(hdev, type, &sco_pi(sk)->dst,
241                                sco_pi(sk)->setting);
242         if (IS_ERR(hcon)) {
243                 err = PTR_ERR(hcon);
244                 goto done;
245         }
246 
247         conn = sco_conn_add(hcon);
248         if (!conn) {
249                 hci_conn_drop(hcon);
250                 err = -ENOMEM;
251                 goto done;
252         }
253 
254         /* Update source addr of the socket */
255         bacpy(&sco_pi(sk)->src, &hcon->src);
256 
257         err = sco_chan_add(conn, sk, NULL);
258         if (err)
259                 goto done;
260 
261         if (hcon->state == BT_CONNECTED) {
262                 sco_sock_clear_timer(sk);
263                 sk->sk_state = BT_CONNECTED;
264         } else {
265                 sk->sk_state = BT_CONNECT;
266                 sco_sock_set_timer(sk, sk->sk_sndtimeo);
267         }
268 
269 done:
270         hci_dev_unlock(hdev);
271         hci_dev_put(hdev);
272         return err;
273 }
274 
275 static int sco_send_frame(struct sock *sk, struct msghdr *msg, int len)
276 {
277         struct sco_conn *conn = sco_pi(sk)->conn;
278         struct sk_buff *skb;
279         int err;
280 
281         /* Check outgoing MTU */
282         if (len > conn->mtu)
283                 return -EINVAL;
284 
285         BT_DBG("sk %p len %d", sk, len);
286 
287         skb = bt_skb_send_alloc(sk, len, msg->msg_flags & MSG_DONTWAIT, &err);
288         if (!skb)
289                 return err;
290 
291         if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
292                 kfree_skb(skb);
293                 return -EFAULT;
294         }
295 
296         hci_send_sco(conn->hcon, skb);
297 
298         return len;
299 }
300 
301 static void sco_recv_frame(struct sco_conn *conn, struct sk_buff *skb)
302 {
303         struct sock *sk;
304 
305         sco_conn_lock(conn);
306         sk = conn->sk;
307         sco_conn_unlock(conn);
308 
309         if (!sk)
310                 goto drop;
311 
312         BT_DBG("sk %p len %d", sk, skb->len);
313 
314         if (sk->sk_state != BT_CONNECTED)
315                 goto drop;
316 
317         if (!sock_queue_rcv_skb(sk, skb))
318                 return;
319 
320 drop:
321         kfree_skb(skb);
322 }
323 
324 /* -------- Socket interface ---------- */
325 static struct sock *__sco_get_sock_listen_by_addr(bdaddr_t *ba)
326 {
327         struct sock *sk;
328 
329         sk_for_each(sk, &sco_sk_list.head) {
330                 if (sk->sk_state != BT_LISTEN)
331                         continue;
332 
333                 if (!bacmp(&sco_pi(sk)->src, ba))
334                         return sk;
335         }
336 
337         return NULL;
338 }
339 
340 /* Find socket listening on source bdaddr.
341  * Returns closest match.
342  */
343 static struct sock *sco_get_sock_listen(bdaddr_t *src)
344 {
345         struct sock *sk = NULL, *sk1 = NULL;
346 
347         read_lock(&sco_sk_list.lock);
348 
349         sk_for_each(sk, &sco_sk_list.head) {
350                 if (sk->sk_state != BT_LISTEN)
351                         continue;
352 
353                 /* Exact match. */
354                 if (!bacmp(&sco_pi(sk)->src, src))
355                         break;
356 
357                 /* Closest match */
358                 if (!bacmp(&sco_pi(sk)->src, BDADDR_ANY))
359                         sk1 = sk;
360         }
361 
362         read_unlock(&sco_sk_list.lock);
363 
364         return sk ? sk : sk1;
365 }
366 
367 static void sco_sock_destruct(struct sock *sk)
368 {
369         BT_DBG("sk %p", sk);
370 
371         skb_queue_purge(&sk->sk_receive_queue);
372         skb_queue_purge(&sk->sk_write_queue);
373 }
374 
375 static void sco_sock_cleanup_listen(struct sock *parent)
376 {
377         struct sock *sk;
378 
379         BT_DBG("parent %p", parent);
380 
381         /* Close not yet accepted channels */
382         while ((sk = bt_accept_dequeue(parent, NULL))) {
383                 sco_sock_close(sk);
384                 sco_sock_kill(sk);
385         }
386 
387         parent->sk_state  = BT_CLOSED;
388         sock_set_flag(parent, SOCK_ZAPPED);
389 }
390 
391 /* Kill socket (only if zapped and orphan)
392  * Must be called on unlocked socket.
393  */
394 static void sco_sock_kill(struct sock *sk)
395 {
396         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
397                 return;
398 
399         BT_DBG("sk %p state %d", sk, sk->sk_state);
400 
401         /* Kill poor orphan */
402         bt_sock_unlink(&sco_sk_list, sk);
403         sock_set_flag(sk, SOCK_DEAD);
404         sock_put(sk);
405 }
406 
407 static void __sco_sock_close(struct sock *sk)
408 {
409         BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
410 
411         switch (sk->sk_state) {
412         case BT_LISTEN:
413                 sco_sock_cleanup_listen(sk);
414                 break;
415 
416         case BT_CONNECTED:
417         case BT_CONFIG:
418                 if (sco_pi(sk)->conn->hcon) {
419                         sk->sk_state = BT_DISCONN;
420                         sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
421                         sco_conn_lock(sco_pi(sk)->conn);
422                         hci_conn_drop(sco_pi(sk)->conn->hcon);
423                         sco_pi(sk)->conn->hcon = NULL;
424                         sco_conn_unlock(sco_pi(sk)->conn);
425                 } else
426                         sco_chan_del(sk, ECONNRESET);
427                 break;
428 
429         case BT_CONNECT2:
430         case BT_CONNECT:
431         case BT_DISCONN:
432                 sco_chan_del(sk, ECONNRESET);
433                 break;
434 
435         default:
436                 sock_set_flag(sk, SOCK_ZAPPED);
437                 break;
438         }
439 }
440 
441 /* Must be called on unlocked socket. */
442 static void sco_sock_close(struct sock *sk)
443 {
444         sco_sock_clear_timer(sk);
445         lock_sock(sk);
446         __sco_sock_close(sk);
447         release_sock(sk);
448         sco_sock_kill(sk);
449 }
450 
451 static void sco_sock_init(struct sock *sk, struct sock *parent)
452 {
453         BT_DBG("sk %p", sk);
454 
455         if (parent) {
456                 sk->sk_type = parent->sk_type;
457                 bt_sk(sk)->flags = bt_sk(parent)->flags;
458                 security_sk_clone(parent, sk);
459         }
460 }
461 
462 static struct proto sco_proto = {
463         .name           = "SCO",
464         .owner          = THIS_MODULE,
465         .obj_size       = sizeof(struct sco_pinfo)
466 };
467 
468 static struct sock *sco_sock_alloc(struct net *net, struct socket *sock,
469                                    int proto, gfp_t prio, int kern)
470 {
471         struct sock *sk;
472 
473         sk = sk_alloc(net, PF_BLUETOOTH, prio, &sco_proto, kern);
474         if (!sk)
475                 return NULL;
476 
477         sock_init_data(sock, sk);
478         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
479 
480         sk->sk_destruct = sco_sock_destruct;
481         sk->sk_sndtimeo = SCO_CONN_TIMEOUT;
482 
483         sock_reset_flag(sk, SOCK_ZAPPED);
484 
485         sk->sk_protocol = proto;
486         sk->sk_state    = BT_OPEN;
487 
488         sco_pi(sk)->setting = BT_VOICE_CVSD_16BIT;
489 
490         timer_setup(&sk->sk_timer, sco_sock_timeout, 0);
491 
492         bt_sock_link(&sco_sk_list, sk);
493         return sk;
494 }
495 
496 static int sco_sock_create(struct net *net, struct socket *sock, int protocol,
497                            int kern)
498 {
499         struct sock *sk;
500 
501         BT_DBG("sock %p", sock);
502 
503         sock->state = SS_UNCONNECTED;
504 
505         if (sock->type != SOCK_SEQPACKET)
506                 return -ESOCKTNOSUPPORT;
507 
508         sock->ops = &sco_sock_ops;
509 
510         sk = sco_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
511         if (!sk)
512                 return -ENOMEM;
513 
514         sco_sock_init(sk, NULL);
515         return 0;
516 }
517 
518 static int sco_sock_bind(struct socket *sock, struct sockaddr *addr,
519                          int addr_len)
520 {
521         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
522         struct sock *sk = sock->sk;
523         int err = 0;
524 
525         BT_DBG("sk %p %pMR", sk, &sa->sco_bdaddr);
526 
527         if (!addr || addr_len < sizeof(struct sockaddr_sco) ||
528             addr->sa_family != AF_BLUETOOTH)
529                 return -EINVAL;
530 
531         lock_sock(sk);
532 
533         if (sk->sk_state != BT_OPEN) {
534                 err = -EBADFD;
535                 goto done;
536         }
537 
538         if (sk->sk_type != SOCK_SEQPACKET) {
539                 err = -EINVAL;
540                 goto done;
541         }
542 
543         bacpy(&sco_pi(sk)->src, &sa->sco_bdaddr);
544 
545         sk->sk_state = BT_BOUND;
546 
547 done:
548         release_sock(sk);
549         return err;
550 }
551 
552 static int sco_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
553 {
554         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
555         struct sock *sk = sock->sk;
556         int err;
557 
558         BT_DBG("sk %p", sk);
559 
560         if (alen < sizeof(struct sockaddr_sco) ||
561             addr->sa_family != AF_BLUETOOTH)
562                 return -EINVAL;
563 
564         if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
565                 return -EBADFD;
566 
567         if (sk->sk_type != SOCK_SEQPACKET)
568                 return -EINVAL;
569 
570         lock_sock(sk);
571 
572         /* Set destination address and psm */
573         bacpy(&sco_pi(sk)->dst, &sa->sco_bdaddr);
574 
575         err = sco_connect(sk);
576         if (err)
577                 goto done;
578 
579         err = bt_sock_wait_state(sk, BT_CONNECTED,
580                                  sock_sndtimeo(sk, flags & O_NONBLOCK));
581 
582 done:
583         release_sock(sk);
584         return err;
585 }
586 
587 static int sco_sock_listen(struct socket *sock, int backlog)
588 {
589         struct sock *sk = sock->sk;
590         bdaddr_t *src = &sco_pi(sk)->src;
591         int err = 0;
592 
593         BT_DBG("sk %p backlog %d", sk, backlog);
594 
595         lock_sock(sk);
596 
597         if (sk->sk_state != BT_BOUND) {
598                 err = -EBADFD;
599                 goto done;
600         }
601 
602         if (sk->sk_type != SOCK_SEQPACKET) {
603                 err = -EINVAL;
604                 goto done;
605         }
606 
607         write_lock(&sco_sk_list.lock);
608 
609         if (__sco_get_sock_listen_by_addr(src)) {
610                 err = -EADDRINUSE;
611                 goto unlock;
612         }
613 
614         sk->sk_max_ack_backlog = backlog;
615         sk->sk_ack_backlog = 0;
616 
617         sk->sk_state = BT_LISTEN;
618 
619 unlock:
620         write_unlock(&sco_sk_list.lock);
621 
622 done:
623         release_sock(sk);
624         return err;
625 }
626 
627 static int sco_sock_accept(struct socket *sock, struct socket *newsock,
628                            int flags, bool kern)
629 {
630         DEFINE_WAIT_FUNC(wait, woken_wake_function);
631         struct sock *sk = sock->sk, *ch;
632         long timeo;
633         int err = 0;
634 
635         lock_sock(sk);
636 
637         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
638 
639         BT_DBG("sk %p timeo %ld", sk, timeo);
640 
641         /* Wait for an incoming connection. (wake-one). */
642         add_wait_queue_exclusive(sk_sleep(sk), &wait);
643         while (1) {
644                 if (sk->sk_state != BT_LISTEN) {
645                         err = -EBADFD;
646                         break;
647                 }
648 
649                 ch = bt_accept_dequeue(sk, newsock);
650                 if (ch)
651                         break;
652 
653                 if (!timeo) {
654                         err = -EAGAIN;
655                         break;
656                 }
657 
658                 if (signal_pending(current)) {
659                         err = sock_intr_errno(timeo);
660                         break;
661                 }
662 
663                 release_sock(sk);
664 
665                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
666                 lock_sock(sk);
667         }
668         remove_wait_queue(sk_sleep(sk), &wait);
669 
670         if (err)
671                 goto done;
672 
673         newsock->state = SS_CONNECTED;
674 
675         BT_DBG("new socket %p", ch);
676 
677 done:
678         release_sock(sk);
679         return err;
680 }
681 
682 static int sco_sock_getname(struct socket *sock, struct sockaddr *addr,
683                             int *len, int peer)
684 {
685         struct sockaddr_sco *sa = (struct sockaddr_sco *) addr;
686         struct sock *sk = sock->sk;
687 
688         BT_DBG("sock %p, sk %p", sock, sk);
689 
690         addr->sa_family = AF_BLUETOOTH;
691         *len = sizeof(struct sockaddr_sco);
692 
693         if (peer)
694                 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->dst);
695         else
696                 bacpy(&sa->sco_bdaddr, &sco_pi(sk)->src);
697 
698         return 0;
699 }
700 
701 static int sco_sock_sendmsg(struct socket *sock, struct msghdr *msg,
702                             size_t len)
703 {
704         struct sock *sk = sock->sk;
705         int err;
706 
707         BT_DBG("sock %p, sk %p", sock, sk);
708 
709         err = sock_error(sk);
710         if (err)
711                 return err;
712 
713         if (msg->msg_flags & MSG_OOB)
714                 return -EOPNOTSUPP;
715 
716         lock_sock(sk);
717 
718         if (sk->sk_state == BT_CONNECTED)
719                 err = sco_send_frame(sk, msg, len);
720         else
721                 err = -ENOTCONN;
722 
723         release_sock(sk);
724         return err;
725 }
726 
727 static void sco_conn_defer_accept(struct hci_conn *conn, u16 setting)
728 {
729         struct hci_dev *hdev = conn->hdev;
730 
731         BT_DBG("conn %p", conn);
732 
733         conn->state = BT_CONFIG;
734 
735         if (!lmp_esco_capable(hdev)) {
736                 struct hci_cp_accept_conn_req cp;
737 
738                 bacpy(&cp.bdaddr, &conn->dst);
739                 cp.role = 0x00; /* Ignored */
740 
741                 hci_send_cmd(hdev, HCI_OP_ACCEPT_CONN_REQ, sizeof(cp), &cp);
742         } else {
743                 struct hci_cp_accept_sync_conn_req cp;
744 
745                 bacpy(&cp.bdaddr, &conn->dst);
746                 cp.pkt_type = cpu_to_le16(conn->pkt_type);
747 
748                 cp.tx_bandwidth   = cpu_to_le32(0x00001f40);
749                 cp.rx_bandwidth   = cpu_to_le32(0x00001f40);
750                 cp.content_format = cpu_to_le16(setting);
751 
752                 switch (setting & SCO_AIRMODE_MASK) {
753                 case SCO_AIRMODE_TRANSP:
754                         if (conn->pkt_type & ESCO_2EV3)
755                                 cp.max_latency = cpu_to_le16(0x0008);
756                         else
757                                 cp.max_latency = cpu_to_le16(0x000D);
758                         cp.retrans_effort = 0x02;
759                         break;
760                 case SCO_AIRMODE_CVSD:
761                         cp.max_latency = cpu_to_le16(0xffff);
762                         cp.retrans_effort = 0xff;
763                         break;
764                 }
765 
766                 hci_send_cmd(hdev, HCI_OP_ACCEPT_SYNC_CONN_REQ,
767                              sizeof(cp), &cp);
768         }
769 }
770 
771 static int sco_sock_recvmsg(struct socket *sock, struct msghdr *msg,
772                             size_t len, int flags)
773 {
774         struct sock *sk = sock->sk;
775         struct sco_pinfo *pi = sco_pi(sk);
776 
777         lock_sock(sk);
778 
779         if (sk->sk_state == BT_CONNECT2 &&
780             test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
781                 sco_conn_defer_accept(pi->conn->hcon, pi->setting);
782                 sk->sk_state = BT_CONFIG;
783 
784                 release_sock(sk);
785                 return 0;
786         }
787 
788         release_sock(sk);
789 
790         return bt_sock_recvmsg(sock, msg, len, flags);
791 }
792 
793 static int sco_sock_setsockopt(struct socket *sock, int level, int optname,
794                                char __user *optval, unsigned int optlen)
795 {
796         struct sock *sk = sock->sk;
797         int len, err = 0;
798         struct bt_voice voice;
799         u32 opt;
800 
801         BT_DBG("sk %p", sk);
802 
803         lock_sock(sk);
804 
805         switch (optname) {
806 
807         case BT_DEFER_SETUP:
808                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
809                         err = -EINVAL;
810                         break;
811                 }
812 
813                 if (get_user(opt, (u32 __user *) optval)) {
814                         err = -EFAULT;
815                         break;
816                 }
817 
818                 if (opt)
819                         set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
820                 else
821                         clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
822                 break;
823 
824         case BT_VOICE:
825                 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
826                     sk->sk_state != BT_CONNECT2) {
827                         err = -EINVAL;
828                         break;
829                 }
830 
831                 voice.setting = sco_pi(sk)->setting;
832 
833                 len = min_t(unsigned int, sizeof(voice), optlen);
834                 if (copy_from_user((char *)&voice, optval, len)) {
835                         err = -EFAULT;
836                         break;
837                 }
838 
839                 /* Explicitly check for these values */
840                 if (voice.setting != BT_VOICE_TRANSPARENT &&
841                     voice.setting != BT_VOICE_CVSD_16BIT) {
842                         err = -EINVAL;
843                         break;
844                 }
845 
846                 sco_pi(sk)->setting = voice.setting;
847                 break;
848 
849         default:
850                 err = -ENOPROTOOPT;
851                 break;
852         }
853 
854         release_sock(sk);
855         return err;
856 }
857 
858 static int sco_sock_getsockopt_old(struct socket *sock, int optname,
859                                    char __user *optval, int __user *optlen)
860 {
861         struct sock *sk = sock->sk;
862         struct sco_options opts;
863         struct sco_conninfo cinfo;
864         int len, err = 0;
865 
866         BT_DBG("sk %p", sk);
867 
868         if (get_user(len, optlen))
869                 return -EFAULT;
870 
871         lock_sock(sk);
872 
873         switch (optname) {
874         case SCO_OPTIONS:
875                 if (sk->sk_state != BT_CONNECTED &&
876                     !(sk->sk_state == BT_CONNECT2 &&
877                       test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
878                         err = -ENOTCONN;
879                         break;
880                 }
881 
882                 opts.mtu = sco_pi(sk)->conn->mtu;
883 
884                 BT_DBG("mtu %d", opts.mtu);
885 
886                 len = min_t(unsigned int, len, sizeof(opts));
887                 if (copy_to_user(optval, (char *)&opts, len))
888                         err = -EFAULT;
889 
890                 break;
891 
892         case SCO_CONNINFO:
893                 if (sk->sk_state != BT_CONNECTED &&
894                     !(sk->sk_state == BT_CONNECT2 &&
895                       test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
896                         err = -ENOTCONN;
897                         break;
898                 }
899 
900                 memset(&cinfo, 0, sizeof(cinfo));
901                 cinfo.hci_handle = sco_pi(sk)->conn->hcon->handle;
902                 memcpy(cinfo.dev_class, sco_pi(sk)->conn->hcon->dev_class, 3);
903 
904                 len = min_t(unsigned int, len, sizeof(cinfo));
905                 if (copy_to_user(optval, (char *)&cinfo, len))
906                         err = -EFAULT;
907 
908                 break;
909 
910         default:
911                 err = -ENOPROTOOPT;
912                 break;
913         }
914 
915         release_sock(sk);
916         return err;
917 }
918 
919 static int sco_sock_getsockopt(struct socket *sock, int level, int optname,
920                                char __user *optval, int __user *optlen)
921 {
922         struct sock *sk = sock->sk;
923         int len, err = 0;
924         struct bt_voice voice;
925 
926         BT_DBG("sk %p", sk);
927 
928         if (level == SOL_SCO)
929                 return sco_sock_getsockopt_old(sock, optname, optval, optlen);
930 
931         if (get_user(len, optlen))
932                 return -EFAULT;
933 
934         lock_sock(sk);
935 
936         switch (optname) {
937 
938         case BT_DEFER_SETUP:
939                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
940                         err = -EINVAL;
941                         break;
942                 }
943 
944                 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
945                              (u32 __user *)optval))
946                         err = -EFAULT;
947 
948                 break;
949 
950         case BT_VOICE:
951                 voice.setting = sco_pi(sk)->setting;
952 
953                 len = min_t(unsigned int, len, sizeof(voice));
954                 if (copy_to_user(optval, (char *)&voice, len))
955                         err = -EFAULT;
956 
957                 break;
958 
959         default:
960                 err = -ENOPROTOOPT;
961                 break;
962         }
963 
964         release_sock(sk);
965         return err;
966 }
967 
968 static int sco_sock_shutdown(struct socket *sock, int how)
969 {
970         struct sock *sk = sock->sk;
971         int err = 0;
972 
973         BT_DBG("sock %p, sk %p", sock, sk);
974 
975         if (!sk)
976                 return 0;
977 
978         sock_hold(sk);
979         lock_sock(sk);
980 
981         if (!sk->sk_shutdown) {
982                 sk->sk_shutdown = SHUTDOWN_MASK;
983                 sco_sock_clear_timer(sk);
984                 __sco_sock_close(sk);
985 
986                 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
987                     !(current->flags & PF_EXITING))
988                         err = bt_sock_wait_state(sk, BT_CLOSED,
989                                                  sk->sk_lingertime);
990         }
991 
992         release_sock(sk);
993         sock_put(sk);
994 
995         return err;
996 }
997 
998 static int sco_sock_release(struct socket *sock)
999 {
1000         struct sock *sk = sock->sk;
1001         int err = 0;
1002 
1003         BT_DBG("sock %p, sk %p", sock, sk);
1004 
1005         if (!sk)
1006                 return 0;
1007 
1008         sco_sock_close(sk);
1009 
1010         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1011             !(current->flags & PF_EXITING)) {
1012                 lock_sock(sk);
1013                 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1014                 release_sock(sk);
1015         }
1016 
1017         sock_orphan(sk);
1018         sco_sock_kill(sk);
1019         return err;
1020 }
1021 
1022 static void sco_conn_ready(struct sco_conn *conn)
1023 {
1024         struct sock *parent;
1025         struct sock *sk = conn->sk;
1026 
1027         BT_DBG("conn %p", conn);
1028 
1029         if (sk) {
1030                 sco_sock_clear_timer(sk);
1031                 bh_lock_sock(sk);
1032                 sk->sk_state = BT_CONNECTED;
1033                 sk->sk_state_change(sk);
1034                 bh_unlock_sock(sk);
1035         } else {
1036                 sco_conn_lock(conn);
1037 
1038                 if (!conn->hcon) {
1039                         sco_conn_unlock(conn);
1040                         return;
1041                 }
1042 
1043                 parent = sco_get_sock_listen(&conn->hcon->src);
1044                 if (!parent) {
1045                         sco_conn_unlock(conn);
1046                         return;
1047                 }
1048 
1049                 bh_lock_sock(parent);
1050 
1051                 sk = sco_sock_alloc(sock_net(parent), NULL,
1052                                     BTPROTO_SCO, GFP_ATOMIC, 0);
1053                 if (!sk) {
1054                         bh_unlock_sock(parent);
1055                         sco_conn_unlock(conn);
1056                         return;
1057                 }
1058 
1059                 sco_sock_init(sk, parent);
1060 
1061                 bacpy(&sco_pi(sk)->src, &conn->hcon->src);
1062                 bacpy(&sco_pi(sk)->dst, &conn->hcon->dst);
1063 
1064                 hci_conn_hold(conn->hcon);
1065                 __sco_chan_add(conn, sk, parent);
1066 
1067                 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1068                         sk->sk_state = BT_CONNECT2;
1069                 else
1070                         sk->sk_state = BT_CONNECTED;
1071 
1072                 /* Wake up parent */
1073                 parent->sk_data_ready(parent);
1074 
1075                 bh_unlock_sock(parent);
1076 
1077                 sco_conn_unlock(conn);
1078         }
1079 }
1080 
1081 /* ----- SCO interface with lower layer (HCI) ----- */
1082 int sco_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1083 {
1084         struct sock *sk;
1085         int lm = 0;
1086 
1087         BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1088 
1089         /* Find listening sockets */
1090         read_lock(&sco_sk_list.lock);
1091         sk_for_each(sk, &sco_sk_list.head) {
1092                 if (sk->sk_state != BT_LISTEN)
1093                         continue;
1094 
1095                 if (!bacmp(&sco_pi(sk)->src, &hdev->bdaddr) ||
1096                     !bacmp(&sco_pi(sk)->src, BDADDR_ANY)) {
1097                         lm |= HCI_LM_ACCEPT;
1098 
1099                         if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1100                                 *flags |= HCI_PROTO_DEFER;
1101                         break;
1102                 }
1103         }
1104         read_unlock(&sco_sk_list.lock);
1105 
1106         return lm;
1107 }
1108 
1109 static void sco_connect_cfm(struct hci_conn *hcon, __u8 status)
1110 {
1111         if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1112                 return;
1113 
1114         BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1115 
1116         if (!status) {
1117                 struct sco_conn *conn;
1118 
1119                 conn = sco_conn_add(hcon);
1120                 if (conn)
1121                         sco_conn_ready(conn);
1122         } else
1123                 sco_conn_del(hcon, bt_to_errno(status));
1124 }
1125 
1126 static void sco_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1127 {
1128         if (hcon->type != SCO_LINK && hcon->type != ESCO_LINK)
1129                 return;
1130 
1131         BT_DBG("hcon %p reason %d", hcon, reason);
1132 
1133         sco_conn_del(hcon, bt_to_errno(reason));
1134 }
1135 
1136 void sco_recv_scodata(struct hci_conn *hcon, struct sk_buff *skb)
1137 {
1138         struct sco_conn *conn = hcon->sco_data;
1139 
1140         if (!conn)
1141                 goto drop;
1142 
1143         BT_DBG("conn %p len %d", conn, skb->len);
1144 
1145         if (skb->len) {
1146                 sco_recv_frame(conn, skb);
1147                 return;
1148         }
1149 
1150 drop:
1151         kfree_skb(skb);
1152 }
1153 
1154 static struct hci_cb sco_cb = {
1155         .name           = "SCO",
1156         .connect_cfm    = sco_connect_cfm,
1157         .disconn_cfm    = sco_disconn_cfm,
1158 };
1159 
1160 static int sco_debugfs_show(struct seq_file *f, void *p)
1161 {
1162         struct sock *sk;
1163 
1164         read_lock(&sco_sk_list.lock);
1165 
1166         sk_for_each(sk, &sco_sk_list.head) {
1167                 seq_printf(f, "%pMR %pMR %d\n", &sco_pi(sk)->src,
1168                            &sco_pi(sk)->dst, sk->sk_state);
1169         }
1170 
1171         read_unlock(&sco_sk_list.lock);
1172 
1173         return 0;
1174 }
1175 
1176 static int sco_debugfs_open(struct inode *inode, struct file *file)
1177 {
1178         return single_open(file, sco_debugfs_show, inode->i_private);
1179 }
1180 
1181 static const struct file_operations sco_debugfs_fops = {
1182         .open           = sco_debugfs_open,
1183         .read           = seq_read,
1184         .llseek         = seq_lseek,
1185         .release        = single_release,
1186 };
1187 
1188 static struct dentry *sco_debugfs;
1189 
1190 static const struct proto_ops sco_sock_ops = {
1191         .family         = PF_BLUETOOTH,
1192         .owner          = THIS_MODULE,
1193         .release        = sco_sock_release,
1194         .bind           = sco_sock_bind,
1195         .connect        = sco_sock_connect,
1196         .listen         = sco_sock_listen,
1197         .accept         = sco_sock_accept,
1198         .getname        = sco_sock_getname,
1199         .sendmsg        = sco_sock_sendmsg,
1200         .recvmsg        = sco_sock_recvmsg,
1201         .poll           = bt_sock_poll,
1202         .ioctl          = bt_sock_ioctl,
1203         .mmap           = sock_no_mmap,
1204         .socketpair     = sock_no_socketpair,
1205         .shutdown       = sco_sock_shutdown,
1206         .setsockopt     = sco_sock_setsockopt,
1207         .getsockopt     = sco_sock_getsockopt
1208 };
1209 
1210 static const struct net_proto_family sco_sock_family_ops = {
1211         .family = PF_BLUETOOTH,
1212         .owner  = THIS_MODULE,
1213         .create = sco_sock_create,
1214 };
1215 
1216 int __init sco_init(void)
1217 {
1218         int err;
1219 
1220         BUILD_BUG_ON(sizeof(struct sockaddr_sco) > sizeof(struct sockaddr));
1221 
1222         err = proto_register(&sco_proto, 0);
1223         if (err < 0)
1224                 return err;
1225 
1226         err = bt_sock_register(BTPROTO_SCO, &sco_sock_family_ops);
1227         if (err < 0) {
1228                 BT_ERR("SCO socket registration failed");
1229                 goto error;
1230         }
1231 
1232         err = bt_procfs_init(&init_net, "sco", &sco_sk_list, NULL);
1233         if (err < 0) {
1234                 BT_ERR("Failed to create SCO proc file");
1235                 bt_sock_unregister(BTPROTO_SCO);
1236                 goto error;
1237         }
1238 
1239         BT_INFO("SCO socket layer initialized");
1240 
1241         hci_register_cb(&sco_cb);
1242 
1243         if (IS_ERR_OR_NULL(bt_debugfs))
1244                 return 0;
1245 
1246         sco_debugfs = debugfs_create_file("sco", 0444, bt_debugfs,
1247                                           NULL, &sco_debugfs_fops);
1248 
1249         return 0;
1250 
1251 error:
1252         proto_unregister(&sco_proto);
1253         return err;
1254 }
1255 
1256 void sco_exit(void)
1257 {
1258         bt_procfs_cleanup(&init_net, "sco");
1259 
1260         debugfs_remove(sco_debugfs);
1261 
1262         hci_unregister_cb(&sco_cb);
1263 
1264         bt_sock_unregister(BTPROTO_SCO);
1265 
1266         proto_unregister(&sco_proto);
1267 }
1268 
1269 module_param(disable_esco, bool, 0644);
1270 MODULE_PARM_DESC(disable_esco, "Disable eSCO connection creation");
1271 

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