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TOMOYO Linux Cross Reference
Linux/net/bluetooth/l2cap_sock.c

Version: ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ 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    Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
  5    Copyright (C) 2010 Google Inc.
  6    Copyright (C) 2011 ProFUSION Embedded Systems
  7 
  8    Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
  9 
 10    This program is free software; you can redistribute it and/or modify
 11    it under the terms of the GNU General Public License version 2 as
 12    published by the Free Software Foundation;
 13 
 14    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 15    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
 17    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
 18    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
 19    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 20    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 21    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 22 
 23    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
 24    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
 25    SOFTWARE IS DISCLAIMED.
 26 */
 27 
 28 /* Bluetooth L2CAP sockets. */
 29 
 30 #include <linux/module.h>
 31 #include <linux/export.h>
 32 
 33 #include <net/bluetooth/bluetooth.h>
 34 #include <net/bluetooth/hci_core.h>
 35 #include <net/bluetooth/l2cap.h>
 36 
 37 #include "smp.h"
 38 
 39 static struct bt_sock_list l2cap_sk_list = {
 40         .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
 41 };
 42 
 43 static const struct proto_ops l2cap_sock_ops;
 44 static void l2cap_sock_init(struct sock *sk, struct sock *parent);
 45 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
 46                                      int proto, gfp_t prio, int kern);
 47 
 48 bool l2cap_is_socket(struct socket *sock)
 49 {
 50         return sock && sock->ops == &l2cap_sock_ops;
 51 }
 52 EXPORT_SYMBOL(l2cap_is_socket);
 53 
 54 static int l2cap_validate_bredr_psm(u16 psm)
 55 {
 56         /* PSM must be odd and lsb of upper byte must be 0 */
 57         if ((psm & 0x0101) != 0x0001)
 58                 return -EINVAL;
 59 
 60         /* Restrict usage of well-known PSMs */
 61         if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE))
 62                 return -EACCES;
 63 
 64         return 0;
 65 }
 66 
 67 static int l2cap_validate_le_psm(u16 psm)
 68 {
 69         /* Valid LE_PSM ranges are defined only until 0x00ff */
 70         if (psm > L2CAP_PSM_LE_DYN_END)
 71                 return -EINVAL;
 72 
 73         /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */
 74         if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE))
 75                 return -EACCES;
 76 
 77         return 0;
 78 }
 79 
 80 static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 81 {
 82         struct sock *sk = sock->sk;
 83         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
 84         struct sockaddr_l2 la;
 85         int len, err = 0;
 86 
 87         BT_DBG("sk %p", sk);
 88 
 89         if (!addr || addr->sa_family != AF_BLUETOOTH)
 90                 return -EINVAL;
 91 
 92         memset(&la, 0, sizeof(la));
 93         len = min_t(unsigned int, sizeof(la), alen);
 94         memcpy(&la, addr, len);
 95 
 96         if (la.l2_cid && la.l2_psm)
 97                 return -EINVAL;
 98 
 99         if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
100                 return -EINVAL;
101 
102         if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
103                 /* We only allow ATT user space socket */
104                 if (la.l2_cid &&
105                     la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
106                         return -EINVAL;
107         }
108 
109         lock_sock(sk);
110 
111         if (sk->sk_state != BT_OPEN) {
112                 err = -EBADFD;
113                 goto done;
114         }
115 
116         if (la.l2_psm) {
117                 __u16 psm = __le16_to_cpu(la.l2_psm);
118 
119                 if (la.l2_bdaddr_type == BDADDR_BREDR)
120                         err = l2cap_validate_bredr_psm(psm);
121                 else
122                         err = l2cap_validate_le_psm(psm);
123 
124                 if (err)
125                         goto done;
126         }
127 
128         bacpy(&chan->src, &la.l2_bdaddr);
129         chan->src_type = la.l2_bdaddr_type;
130 
131         if (la.l2_cid)
132                 err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
133         else
134                 err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
135 
136         if (err < 0)
137                 goto done;
138 
139         switch (chan->chan_type) {
140         case L2CAP_CHAN_CONN_LESS:
141                 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP)
142                         chan->sec_level = BT_SECURITY_SDP;
143                 break;
144         case L2CAP_CHAN_CONN_ORIENTED:
145                 if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP ||
146                     __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM)
147                         chan->sec_level = BT_SECURITY_SDP;
148                 break;
149         case L2CAP_CHAN_RAW:
150                 chan->sec_level = BT_SECURITY_SDP;
151                 break;
152         case L2CAP_CHAN_FIXED:
153                 /* Fixed channels default to the L2CAP core not holding a
154                  * hci_conn reference for them. For fixed channels mapping to
155                  * L2CAP sockets we do want to hold a reference so set the
156                  * appropriate flag to request it.
157                  */
158                 set_bit(FLAG_HOLD_HCI_CONN, &chan->flags);
159                 break;
160         }
161 
162         if (chan->psm && bdaddr_type_is_le(chan->src_type))
163                 chan->mode = L2CAP_MODE_LE_FLOWCTL;
164 
165         chan->state = BT_BOUND;
166         sk->sk_state = BT_BOUND;
167 
168 done:
169         release_sock(sk);
170         return err;
171 }
172 
173 static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr,
174                               int alen, int flags)
175 {
176         struct sock *sk = sock->sk;
177         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
178         struct sockaddr_l2 la;
179         int len, err = 0;
180 
181         BT_DBG("sk %p", sk);
182 
183         if (!addr || alen < sizeof(addr->sa_family) ||
184             addr->sa_family != AF_BLUETOOTH)
185                 return -EINVAL;
186 
187         memset(&la, 0, sizeof(la));
188         len = min_t(unsigned int, sizeof(la), alen);
189         memcpy(&la, addr, len);
190 
191         if (la.l2_cid && la.l2_psm)
192                 return -EINVAL;
193 
194         if (!bdaddr_type_is_valid(la.l2_bdaddr_type))
195                 return -EINVAL;
196 
197         /* Check that the socket wasn't bound to something that
198          * conflicts with the address given to connect(). If chan->src
199          * is BDADDR_ANY it means bind() was never used, in which case
200          * chan->src_type and la.l2_bdaddr_type do not need to match.
201          */
202         if (chan->src_type == BDADDR_BREDR && bacmp(&chan->src, BDADDR_ANY) &&
203             bdaddr_type_is_le(la.l2_bdaddr_type)) {
204                 /* Old user space versions will try to incorrectly bind
205                  * the ATT socket using BDADDR_BREDR. We need to accept
206                  * this and fix up the source address type only when
207                  * both the source CID and destination CID indicate
208                  * ATT. Anything else is an invalid combination.
209                  */
210                 if (chan->scid != L2CAP_CID_ATT ||
211                     la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
212                         return -EINVAL;
213 
214                 /* We don't have the hdev available here to make a
215                  * better decision on random vs public, but since all
216                  * user space versions that exhibit this issue anyway do
217                  * not support random local addresses assuming public
218                  * here is good enough.
219                  */
220                 chan->src_type = BDADDR_LE_PUBLIC;
221         }
222 
223         if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR)
224                 return -EINVAL;
225 
226         if (bdaddr_type_is_le(la.l2_bdaddr_type)) {
227                 /* We only allow ATT user space socket */
228                 if (la.l2_cid &&
229                     la.l2_cid != cpu_to_le16(L2CAP_CID_ATT))
230                         return -EINVAL;
231         }
232 
233         if (chan->psm && bdaddr_type_is_le(chan->src_type))
234                 chan->mode = L2CAP_MODE_LE_FLOWCTL;
235 
236         err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
237                                  &la.l2_bdaddr, la.l2_bdaddr_type);
238         if (err)
239                 return err;
240 
241         lock_sock(sk);
242 
243         err = bt_sock_wait_state(sk, BT_CONNECTED,
244                                  sock_sndtimeo(sk, flags & O_NONBLOCK));
245 
246         release_sock(sk);
247 
248         return err;
249 }
250 
251 static int l2cap_sock_listen(struct socket *sock, int backlog)
252 {
253         struct sock *sk = sock->sk;
254         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
255         int err = 0;
256 
257         BT_DBG("sk %p backlog %d", sk, backlog);
258 
259         lock_sock(sk);
260 
261         if (sk->sk_state != BT_BOUND) {
262                 err = -EBADFD;
263                 goto done;
264         }
265 
266         if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) {
267                 err = -EINVAL;
268                 goto done;
269         }
270 
271         switch (chan->mode) {
272         case L2CAP_MODE_BASIC:
273         case L2CAP_MODE_LE_FLOWCTL:
274                 break;
275         case L2CAP_MODE_ERTM:
276         case L2CAP_MODE_STREAMING:
277                 if (!disable_ertm)
278                         break;
279                 /* fall through */
280         default:
281                 err = -EOPNOTSUPP;
282                 goto done;
283         }
284 
285         sk->sk_max_ack_backlog = backlog;
286         sk->sk_ack_backlog = 0;
287 
288         /* Listening channels need to use nested locking in order not to
289          * cause lockdep warnings when the created child channels end up
290          * being locked in the same thread as the parent channel.
291          */
292         atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
293 
294         chan->state = BT_LISTEN;
295         sk->sk_state = BT_LISTEN;
296 
297 done:
298         release_sock(sk);
299         return err;
300 }
301 
302 static int l2cap_sock_accept(struct socket *sock, struct socket *newsock,
303                              int flags)
304 {
305         DEFINE_WAIT_FUNC(wait, woken_wake_function);
306         struct sock *sk = sock->sk, *nsk;
307         long timeo;
308         int err = 0;
309 
310         lock_sock_nested(sk, L2CAP_NESTING_PARENT);
311 
312         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
313 
314         BT_DBG("sk %p timeo %ld", sk, timeo);
315 
316         /* Wait for an incoming connection. (wake-one). */
317         add_wait_queue_exclusive(sk_sleep(sk), &wait);
318         while (1) {
319                 if (sk->sk_state != BT_LISTEN) {
320                         err = -EBADFD;
321                         break;
322                 }
323 
324                 nsk = bt_accept_dequeue(sk, newsock);
325                 if (nsk)
326                         break;
327 
328                 if (!timeo) {
329                         err = -EAGAIN;
330                         break;
331                 }
332 
333                 if (signal_pending(current)) {
334                         err = sock_intr_errno(timeo);
335                         break;
336                 }
337 
338                 release_sock(sk);
339 
340                 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
341 
342                 lock_sock_nested(sk, L2CAP_NESTING_PARENT);
343         }
344         remove_wait_queue(sk_sleep(sk), &wait);
345 
346         if (err)
347                 goto done;
348 
349         newsock->state = SS_CONNECTED;
350 
351         BT_DBG("new socket %p", nsk);
352 
353 done:
354         release_sock(sk);
355         return err;
356 }
357 
358 static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
359                               int *len, int peer)
360 {
361         struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
362         struct sock *sk = sock->sk;
363         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
364 
365         BT_DBG("sock %p, sk %p", sock, sk);
366 
367         if (peer && sk->sk_state != BT_CONNECTED &&
368             sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 &&
369             sk->sk_state != BT_CONFIG)
370                 return -ENOTCONN;
371 
372         memset(la, 0, sizeof(struct sockaddr_l2));
373         addr->sa_family = AF_BLUETOOTH;
374         *len = sizeof(struct sockaddr_l2);
375 
376         la->l2_psm = chan->psm;
377 
378         if (peer) {
379                 bacpy(&la->l2_bdaddr, &chan->dst);
380                 la->l2_cid = cpu_to_le16(chan->dcid);
381                 la->l2_bdaddr_type = chan->dst_type;
382         } else {
383                 bacpy(&la->l2_bdaddr, &chan->src);
384                 la->l2_cid = cpu_to_le16(chan->scid);
385                 la->l2_bdaddr_type = chan->src_type;
386         }
387 
388         return 0;
389 }
390 
391 static int l2cap_sock_getsockopt_old(struct socket *sock, int optname,
392                                      char __user *optval, int __user *optlen)
393 {
394         struct sock *sk = sock->sk;
395         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
396         struct l2cap_options opts;
397         struct l2cap_conninfo cinfo;
398         int len, err = 0;
399         u32 opt;
400 
401         BT_DBG("sk %p", sk);
402 
403         if (get_user(len, optlen))
404                 return -EFAULT;
405 
406         lock_sock(sk);
407 
408         switch (optname) {
409         case L2CAP_OPTIONS:
410                 /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since
411                  * legacy ATT code depends on getsockopt for
412                  * L2CAP_OPTIONS we need to let this pass.
413                  */
414                 if (bdaddr_type_is_le(chan->src_type) &&
415                     chan->scid != L2CAP_CID_ATT) {
416                         err = -EINVAL;
417                         break;
418                 }
419 
420                 memset(&opts, 0, sizeof(opts));
421                 opts.imtu     = chan->imtu;
422                 opts.omtu     = chan->omtu;
423                 opts.flush_to = chan->flush_to;
424                 opts.mode     = chan->mode;
425                 opts.fcs      = chan->fcs;
426                 opts.max_tx   = chan->max_tx;
427                 opts.txwin_size = chan->tx_win;
428 
429                 len = min_t(unsigned int, len, sizeof(opts));
430                 if (copy_to_user(optval, (char *) &opts, len))
431                         err = -EFAULT;
432 
433                 break;
434 
435         case L2CAP_LM:
436                 switch (chan->sec_level) {
437                 case BT_SECURITY_LOW:
438                         opt = L2CAP_LM_AUTH;
439                         break;
440                 case BT_SECURITY_MEDIUM:
441                         opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
442                         break;
443                 case BT_SECURITY_HIGH:
444                         opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
445                               L2CAP_LM_SECURE;
446                         break;
447                 case BT_SECURITY_FIPS:
448                         opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
449                               L2CAP_LM_SECURE | L2CAP_LM_FIPS;
450                         break;
451                 default:
452                         opt = 0;
453                         break;
454                 }
455 
456                 if (test_bit(FLAG_ROLE_SWITCH, &chan->flags))
457                         opt |= L2CAP_LM_MASTER;
458 
459                 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
460                         opt |= L2CAP_LM_RELIABLE;
461 
462                 if (put_user(opt, (u32 __user *) optval))
463                         err = -EFAULT;
464 
465                 break;
466 
467         case L2CAP_CONNINFO:
468                 if (sk->sk_state != BT_CONNECTED &&
469                     !(sk->sk_state == BT_CONNECT2 &&
470                       test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
471                         err = -ENOTCONN;
472                         break;
473                 }
474 
475                 memset(&cinfo, 0, sizeof(cinfo));
476                 cinfo.hci_handle = chan->conn->hcon->handle;
477                 memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3);
478 
479                 len = min_t(unsigned int, len, sizeof(cinfo));
480                 if (copy_to_user(optval, (char *) &cinfo, len))
481                         err = -EFAULT;
482 
483                 break;
484 
485         default:
486                 err = -ENOPROTOOPT;
487                 break;
488         }
489 
490         release_sock(sk);
491         return err;
492 }
493 
494 static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname,
495                                  char __user *optval, int __user *optlen)
496 {
497         struct sock *sk = sock->sk;
498         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
499         struct bt_security sec;
500         struct bt_power pwr;
501         int len, err = 0;
502 
503         BT_DBG("sk %p", sk);
504 
505         if (level == SOL_L2CAP)
506                 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
507 
508         if (level != SOL_BLUETOOTH)
509                 return -ENOPROTOOPT;
510 
511         if (get_user(len, optlen))
512                 return -EFAULT;
513 
514         lock_sock(sk);
515 
516         switch (optname) {
517         case BT_SECURITY:
518                 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
519                     chan->chan_type != L2CAP_CHAN_FIXED &&
520                     chan->chan_type != L2CAP_CHAN_RAW) {
521                         err = -EINVAL;
522                         break;
523                 }
524 
525                 memset(&sec, 0, sizeof(sec));
526                 if (chan->conn) {
527                         sec.level = chan->conn->hcon->sec_level;
528 
529                         if (sk->sk_state == BT_CONNECTED)
530                                 sec.key_size = chan->conn->hcon->enc_key_size;
531                 } else {
532                         sec.level = chan->sec_level;
533                 }
534 
535                 len = min_t(unsigned int, len, sizeof(sec));
536                 if (copy_to_user(optval, (char *) &sec, len))
537                         err = -EFAULT;
538 
539                 break;
540 
541         case BT_DEFER_SETUP:
542                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
543                         err = -EINVAL;
544                         break;
545                 }
546 
547                 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
548                              (u32 __user *) optval))
549                         err = -EFAULT;
550 
551                 break;
552 
553         case BT_FLUSHABLE:
554                 if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags),
555                              (u32 __user *) optval))
556                         err = -EFAULT;
557 
558                 break;
559 
560         case BT_POWER:
561                 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
562                     && sk->sk_type != SOCK_RAW) {
563                         err = -EINVAL;
564                         break;
565                 }
566 
567                 pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
568 
569                 len = min_t(unsigned int, len, sizeof(pwr));
570                 if (copy_to_user(optval, (char *) &pwr, len))
571                         err = -EFAULT;
572 
573                 break;
574 
575         case BT_CHANNEL_POLICY:
576                 if (put_user(chan->chan_policy, (u32 __user *) optval))
577                         err = -EFAULT;
578                 break;
579 
580         case BT_SNDMTU:
581                 if (!bdaddr_type_is_le(chan->src_type)) {
582                         err = -EINVAL;
583                         break;
584                 }
585 
586                 if (sk->sk_state != BT_CONNECTED) {
587                         err = -ENOTCONN;
588                         break;
589                 }
590 
591                 if (put_user(chan->omtu, (u16 __user *) optval))
592                         err = -EFAULT;
593                 break;
594 
595         case BT_RCVMTU:
596                 if (!bdaddr_type_is_le(chan->src_type)) {
597                         err = -EINVAL;
598                         break;
599                 }
600 
601                 if (put_user(chan->imtu, (u16 __user *) optval))
602                         err = -EFAULT;
603                 break;
604 
605         default:
606                 err = -ENOPROTOOPT;
607                 break;
608         }
609 
610         release_sock(sk);
611         return err;
612 }
613 
614 static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu)
615 {
616         switch (chan->scid) {
617         case L2CAP_CID_ATT:
618                 if (mtu < L2CAP_LE_MIN_MTU)
619                         return false;
620                 break;
621 
622         default:
623                 if (mtu < L2CAP_DEFAULT_MIN_MTU)
624                         return false;
625         }
626 
627         return true;
628 }
629 
630 static int l2cap_sock_setsockopt_old(struct socket *sock, int optname,
631                                      char __user *optval, unsigned int optlen)
632 {
633         struct sock *sk = sock->sk;
634         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
635         struct l2cap_options opts;
636         int len, err = 0;
637         u32 opt;
638 
639         BT_DBG("sk %p", sk);
640 
641         lock_sock(sk);
642 
643         switch (optname) {
644         case L2CAP_OPTIONS:
645                 if (bdaddr_type_is_le(chan->src_type)) {
646                         err = -EINVAL;
647                         break;
648                 }
649 
650                 if (sk->sk_state == BT_CONNECTED) {
651                         err = -EINVAL;
652                         break;
653                 }
654 
655                 opts.imtu     = chan->imtu;
656                 opts.omtu     = chan->omtu;
657                 opts.flush_to = chan->flush_to;
658                 opts.mode     = chan->mode;
659                 opts.fcs      = chan->fcs;
660                 opts.max_tx   = chan->max_tx;
661                 opts.txwin_size = chan->tx_win;
662 
663                 len = min_t(unsigned int, sizeof(opts), optlen);
664                 if (copy_from_user((char *) &opts, optval, len)) {
665                         err = -EFAULT;
666                         break;
667                 }
668 
669                 if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) {
670                         err = -EINVAL;
671                         break;
672                 }
673 
674                 if (!l2cap_valid_mtu(chan, opts.imtu)) {
675                         err = -EINVAL;
676                         break;
677                 }
678 
679                 chan->mode = opts.mode;
680                 switch (chan->mode) {
681                 case L2CAP_MODE_LE_FLOWCTL:
682                         break;
683                 case L2CAP_MODE_BASIC:
684                         clear_bit(CONF_STATE2_DEVICE, &chan->conf_state);
685                         break;
686                 case L2CAP_MODE_ERTM:
687                 case L2CAP_MODE_STREAMING:
688                         if (!disable_ertm)
689                                 break;
690                         /* fall through */
691                 default:
692                         err = -EINVAL;
693                         break;
694                 }
695 
696                 chan->imtu = opts.imtu;
697                 chan->omtu = opts.omtu;
698                 chan->fcs  = opts.fcs;
699                 chan->max_tx = opts.max_tx;
700                 chan->tx_win = opts.txwin_size;
701                 chan->flush_to = opts.flush_to;
702                 break;
703 
704         case L2CAP_LM:
705                 if (get_user(opt, (u32 __user *) optval)) {
706                         err = -EFAULT;
707                         break;
708                 }
709 
710                 if (opt & L2CAP_LM_FIPS) {
711                         err = -EINVAL;
712                         break;
713                 }
714 
715                 if (opt & L2CAP_LM_AUTH)
716                         chan->sec_level = BT_SECURITY_LOW;
717                 if (opt & L2CAP_LM_ENCRYPT)
718                         chan->sec_level = BT_SECURITY_MEDIUM;
719                 if (opt & L2CAP_LM_SECURE)
720                         chan->sec_level = BT_SECURITY_HIGH;
721 
722                 if (opt & L2CAP_LM_MASTER)
723                         set_bit(FLAG_ROLE_SWITCH, &chan->flags);
724                 else
725                         clear_bit(FLAG_ROLE_SWITCH, &chan->flags);
726 
727                 if (opt & L2CAP_LM_RELIABLE)
728                         set_bit(FLAG_FORCE_RELIABLE, &chan->flags);
729                 else
730                         clear_bit(FLAG_FORCE_RELIABLE, &chan->flags);
731                 break;
732 
733         default:
734                 err = -ENOPROTOOPT;
735                 break;
736         }
737 
738         release_sock(sk);
739         return err;
740 }
741 
742 static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname,
743                                  char __user *optval, unsigned int optlen)
744 {
745         struct sock *sk = sock->sk;
746         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
747         struct bt_security sec;
748         struct bt_power pwr;
749         struct l2cap_conn *conn;
750         int len, err = 0;
751         u32 opt;
752 
753         BT_DBG("sk %p", sk);
754 
755         if (level == SOL_L2CAP)
756                 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
757 
758         if (level != SOL_BLUETOOTH)
759                 return -ENOPROTOOPT;
760 
761         lock_sock(sk);
762 
763         switch (optname) {
764         case BT_SECURITY:
765                 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
766                     chan->chan_type != L2CAP_CHAN_FIXED &&
767                     chan->chan_type != L2CAP_CHAN_RAW) {
768                         err = -EINVAL;
769                         break;
770                 }
771 
772                 sec.level = BT_SECURITY_LOW;
773 
774                 len = min_t(unsigned int, sizeof(sec), optlen);
775                 if (copy_from_user((char *) &sec, optval, len)) {
776                         err = -EFAULT;
777                         break;
778                 }
779 
780                 if (sec.level < BT_SECURITY_LOW ||
781                     sec.level > BT_SECURITY_HIGH) {
782                         err = -EINVAL;
783                         break;
784                 }
785 
786                 chan->sec_level = sec.level;
787 
788                 if (!chan->conn)
789                         break;
790 
791                 conn = chan->conn;
792 
793                 /*change security for LE channels */
794                 if (chan->scid == L2CAP_CID_ATT) {
795                         if (smp_conn_security(conn->hcon, sec.level))
796                                 break;
797                         set_bit(FLAG_PENDING_SECURITY, &chan->flags);
798                         sk->sk_state = BT_CONFIG;
799                         chan->state = BT_CONFIG;
800 
801                 /* or for ACL link */
802                 } else if ((sk->sk_state == BT_CONNECT2 &&
803                             test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) ||
804                            sk->sk_state == BT_CONNECTED) {
805                         if (!l2cap_chan_check_security(chan, true))
806                                 set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
807                         else
808                                 sk->sk_state_change(sk);
809                 } else {
810                         err = -EINVAL;
811                 }
812                 break;
813 
814         case BT_DEFER_SETUP:
815                 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
816                         err = -EINVAL;
817                         break;
818                 }
819 
820                 if (get_user(opt, (u32 __user *) optval)) {
821                         err = -EFAULT;
822                         break;
823                 }
824 
825                 if (opt) {
826                         set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
827                         set_bit(FLAG_DEFER_SETUP, &chan->flags);
828                 } else {
829                         clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
830                         clear_bit(FLAG_DEFER_SETUP, &chan->flags);
831                 }
832                 break;
833 
834         case BT_FLUSHABLE:
835                 if (get_user(opt, (u32 __user *) optval)) {
836                         err = -EFAULT;
837                         break;
838                 }
839 
840                 if (opt > BT_FLUSHABLE_ON) {
841                         err = -EINVAL;
842                         break;
843                 }
844 
845                 if (opt == BT_FLUSHABLE_OFF) {
846                         conn = chan->conn;
847                         /* proceed further only when we have l2cap_conn and
848                            No Flush support in the LM */
849                         if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
850                                 err = -EINVAL;
851                                 break;
852                         }
853                 }
854 
855                 if (opt)
856                         set_bit(FLAG_FLUSHABLE, &chan->flags);
857                 else
858                         clear_bit(FLAG_FLUSHABLE, &chan->flags);
859                 break;
860 
861         case BT_POWER:
862                 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED &&
863                     chan->chan_type != L2CAP_CHAN_RAW) {
864                         err = -EINVAL;
865                         break;
866                 }
867 
868                 pwr.force_active = BT_POWER_FORCE_ACTIVE_ON;
869 
870                 len = min_t(unsigned int, sizeof(pwr), optlen);
871                 if (copy_from_user((char *) &pwr, optval, len)) {
872                         err = -EFAULT;
873                         break;
874                 }
875 
876                 if (pwr.force_active)
877                         set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
878                 else
879                         clear_bit(FLAG_FORCE_ACTIVE, &chan->flags);
880                 break;
881 
882         case BT_CHANNEL_POLICY:
883                 if (get_user(opt, (u32 __user *) optval)) {
884                         err = -EFAULT;
885                         break;
886                 }
887 
888                 if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) {
889                         err = -EINVAL;
890                         break;
891                 }
892 
893                 if (chan->mode != L2CAP_MODE_ERTM &&
894                     chan->mode != L2CAP_MODE_STREAMING) {
895                         err = -EOPNOTSUPP;
896                         break;
897                 }
898 
899                 chan->chan_policy = (u8) opt;
900 
901                 if (sk->sk_state == BT_CONNECTED &&
902                     chan->move_role == L2CAP_MOVE_ROLE_NONE)
903                         l2cap_move_start(chan);
904 
905                 break;
906 
907         case BT_SNDMTU:
908                 if (!bdaddr_type_is_le(chan->src_type)) {
909                         err = -EINVAL;
910                         break;
911                 }
912 
913                 /* Setting is not supported as it's the remote side that
914                  * decides this.
915                  */
916                 err = -EPERM;
917                 break;
918 
919         case BT_RCVMTU:
920                 if (!bdaddr_type_is_le(chan->src_type)) {
921                         err = -EINVAL;
922                         break;
923                 }
924 
925                 if (sk->sk_state == BT_CONNECTED) {
926                         err = -EISCONN;
927                         break;
928                 }
929 
930                 if (get_user(opt, (u32 __user *) optval)) {
931                         err = -EFAULT;
932                         break;
933                 }
934 
935                 chan->imtu = opt;
936                 break;
937 
938         default:
939                 err = -ENOPROTOOPT;
940                 break;
941         }
942 
943         release_sock(sk);
944         return err;
945 }
946 
947 static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg,
948                               size_t len)
949 {
950         struct sock *sk = sock->sk;
951         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
952         int err;
953 
954         BT_DBG("sock %p, sk %p", sock, sk);
955 
956         err = sock_error(sk);
957         if (err)
958                 return err;
959 
960         if (msg->msg_flags & MSG_OOB)
961                 return -EOPNOTSUPP;
962 
963         if (sk->sk_state != BT_CONNECTED)
964                 return -ENOTCONN;
965 
966         lock_sock(sk);
967         err = bt_sock_wait_ready(sk, msg->msg_flags);
968         release_sock(sk);
969         if (err)
970                 return err;
971 
972         l2cap_chan_lock(chan);
973         err = l2cap_chan_send(chan, msg, len);
974         l2cap_chan_unlock(chan);
975 
976         return err;
977 }
978 
979 static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg,
980                               size_t len, int flags)
981 {
982         struct sock *sk = sock->sk;
983         struct l2cap_pinfo *pi = l2cap_pi(sk);
984         int err;
985 
986         lock_sock(sk);
987 
988         if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP,
989                                                     &bt_sk(sk)->flags)) {
990                 if (bdaddr_type_is_le(pi->chan->src_type)) {
991                         sk->sk_state = BT_CONNECTED;
992                         pi->chan->state = BT_CONNECTED;
993                         __l2cap_le_connect_rsp_defer(pi->chan);
994                 } else {
995                         sk->sk_state = BT_CONFIG;
996                         pi->chan->state = BT_CONFIG;
997                         __l2cap_connect_rsp_defer(pi->chan);
998                 }
999 
1000                 err = 0;
1001                 goto done;
1002         }
1003 
1004         release_sock(sk);
1005 
1006         if (sock->type == SOCK_STREAM)
1007                 err = bt_sock_stream_recvmsg(sock, msg, len, flags);
1008         else
1009                 err = bt_sock_recvmsg(sock, msg, len, flags);
1010 
1011         if (pi->chan->mode != L2CAP_MODE_ERTM)
1012                 return err;
1013 
1014         /* Attempt to put pending rx data in the socket buffer */
1015 
1016         lock_sock(sk);
1017 
1018         if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state))
1019                 goto done;
1020 
1021         if (pi->rx_busy_skb) {
1022                 if (!sock_queue_rcv_skb(sk, pi->rx_busy_skb))
1023                         pi->rx_busy_skb = NULL;
1024                 else
1025                         goto done;
1026         }
1027 
1028         /* Restore data flow when half of the receive buffer is
1029          * available.  This avoids resending large numbers of
1030          * frames.
1031          */
1032         if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1)
1033                 l2cap_chan_busy(pi->chan, 0);
1034 
1035 done:
1036         release_sock(sk);
1037         return err;
1038 }
1039 
1040 /* Kill socket (only if zapped and orphan)
1041  * Must be called on unlocked socket.
1042  */
1043 static void l2cap_sock_kill(struct sock *sk)
1044 {
1045         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
1046                 return;
1047 
1048         BT_DBG("sk %p state %s", sk, state_to_string(sk->sk_state));
1049 
1050         /* Kill poor orphan */
1051 
1052         l2cap_chan_put(l2cap_pi(sk)->chan);
1053         sock_set_flag(sk, SOCK_DEAD);
1054         sock_put(sk);
1055 }
1056 
1057 static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan)
1058 {
1059         DECLARE_WAITQUEUE(wait, current);
1060         int err = 0;
1061         int timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1062         /* Timeout to prevent infinite loop */
1063         unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT;
1064 
1065         add_wait_queue(sk_sleep(sk), &wait);
1066         set_current_state(TASK_INTERRUPTIBLE);
1067         do {
1068                 BT_DBG("Waiting for %d ACKs, timeout %04d ms",
1069                        chan->unacked_frames, time_after(jiffies, timeout) ? 0 :
1070                        jiffies_to_msecs(timeout - jiffies));
1071 
1072                 if (!timeo)
1073                         timeo = L2CAP_WAIT_ACK_POLL_PERIOD;
1074 
1075                 if (signal_pending(current)) {
1076                         err = sock_intr_errno(timeo);
1077                         break;
1078                 }
1079 
1080                 release_sock(sk);
1081                 timeo = schedule_timeout(timeo);
1082                 lock_sock(sk);
1083                 set_current_state(TASK_INTERRUPTIBLE);
1084 
1085                 err = sock_error(sk);
1086                 if (err)
1087                         break;
1088 
1089                 if (time_after(jiffies, timeout)) {
1090                         err = -ENOLINK;
1091                         break;
1092                 }
1093 
1094         } while (chan->unacked_frames > 0 &&
1095                  chan->state == BT_CONNECTED);
1096 
1097         set_current_state(TASK_RUNNING);
1098         remove_wait_queue(sk_sleep(sk), &wait);
1099         return err;
1100 }
1101 
1102 static int l2cap_sock_shutdown(struct socket *sock, int how)
1103 {
1104         struct sock *sk = sock->sk;
1105         struct l2cap_chan *chan;
1106         struct l2cap_conn *conn;
1107         int err = 0;
1108 
1109         BT_DBG("sock %p, sk %p", sock, sk);
1110 
1111         if (!sk)
1112                 return 0;
1113 
1114         lock_sock(sk);
1115 
1116         if (sk->sk_shutdown)
1117                 goto shutdown_already;
1118 
1119         BT_DBG("Handling sock shutdown");
1120 
1121         /* prevent sk structure from being freed whilst unlocked */
1122         sock_hold(sk);
1123 
1124         chan = l2cap_pi(sk)->chan;
1125         /* prevent chan structure from being freed whilst unlocked */
1126         l2cap_chan_hold(chan);
1127 
1128         BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1129 
1130         if (chan->mode == L2CAP_MODE_ERTM &&
1131             chan->unacked_frames > 0 &&
1132             chan->state == BT_CONNECTED) {
1133                 err = __l2cap_wait_ack(sk, chan);
1134 
1135                 /* After waiting for ACKs, check whether shutdown
1136                  * has already been actioned to close the L2CAP
1137                  * link such as by l2cap_disconnection_req().
1138                  */
1139                 if (sk->sk_shutdown)
1140                         goto has_shutdown;
1141         }
1142 
1143         sk->sk_shutdown = SHUTDOWN_MASK;
1144         release_sock(sk);
1145 
1146         l2cap_chan_lock(chan);
1147         conn = chan->conn;
1148         if (conn)
1149                 /* prevent conn structure from being freed */
1150                 l2cap_conn_get(conn);
1151         l2cap_chan_unlock(chan);
1152 
1153         if (conn)
1154                 /* mutex lock must be taken before l2cap_chan_lock() */
1155                 mutex_lock(&conn->chan_lock);
1156 
1157         l2cap_chan_lock(chan);
1158         l2cap_chan_close(chan, 0);
1159         l2cap_chan_unlock(chan);
1160 
1161         if (conn) {
1162                 mutex_unlock(&conn->chan_lock);
1163                 l2cap_conn_put(conn);
1164         }
1165 
1166         lock_sock(sk);
1167 
1168         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1169             !(current->flags & PF_EXITING))
1170                 err = bt_sock_wait_state(sk, BT_CLOSED,
1171                                          sk->sk_lingertime);
1172 
1173 has_shutdown:
1174         l2cap_chan_put(chan);
1175         sock_put(sk);
1176 
1177 shutdown_already:
1178         if (!err && sk->sk_err)
1179                 err = -sk->sk_err;
1180 
1181         release_sock(sk);
1182 
1183         BT_DBG("Sock shutdown complete err: %d", err);
1184 
1185         return err;
1186 }
1187 
1188 static int l2cap_sock_release(struct socket *sock)
1189 {
1190         struct sock *sk = sock->sk;
1191         int err;
1192 
1193         BT_DBG("sock %p, sk %p", sock, sk);
1194 
1195         if (!sk)
1196                 return 0;
1197 
1198         bt_sock_unlink(&l2cap_sk_list, sk);
1199 
1200         err = l2cap_sock_shutdown(sock, 2);
1201 
1202         sock_orphan(sk);
1203         l2cap_sock_kill(sk);
1204         return err;
1205 }
1206 
1207 static void l2cap_sock_cleanup_listen(struct sock *parent)
1208 {
1209         struct sock *sk;
1210 
1211         BT_DBG("parent %p state %s", parent,
1212                state_to_string(parent->sk_state));
1213 
1214         /* Close not yet accepted channels */
1215         while ((sk = bt_accept_dequeue(parent, NULL))) {
1216                 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1217 
1218                 BT_DBG("child chan %p state %s", chan,
1219                        state_to_string(chan->state));
1220 
1221                 l2cap_chan_lock(chan);
1222                 __clear_chan_timer(chan);
1223                 l2cap_chan_close(chan, ECONNRESET);
1224                 l2cap_chan_unlock(chan);
1225 
1226                 l2cap_sock_kill(sk);
1227         }
1228 }
1229 
1230 static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
1231 {
1232         struct sock *sk, *parent = chan->data;
1233 
1234         lock_sock(parent);
1235 
1236         /* Check for backlog size */
1237         if (sk_acceptq_is_full(parent)) {
1238                 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1239                 release_sock(parent);
1240                 return NULL;
1241         }
1242 
1243         sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP,
1244                               GFP_ATOMIC, 0);
1245         if (!sk) {
1246                 release_sock(parent);
1247                 return NULL;
1248         }
1249 
1250         bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
1251 
1252         l2cap_sock_init(sk, parent);
1253 
1254         bt_accept_enqueue(parent, sk);
1255 
1256         release_sock(parent);
1257 
1258         return l2cap_pi(sk)->chan;
1259 }
1260 
1261 static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
1262 {
1263         struct sock *sk = chan->data;
1264         int err;
1265 
1266         lock_sock(sk);
1267 
1268         if (l2cap_pi(sk)->rx_busy_skb) {
1269                 err = -ENOMEM;
1270                 goto done;
1271         }
1272 
1273         err = sock_queue_rcv_skb(sk, skb);
1274 
1275         /* For ERTM, handle one skb that doesn't fit into the recv
1276          * buffer.  This is important to do because the data frames
1277          * have already been acked, so the skb cannot be discarded.
1278          *
1279          * Notify the l2cap core that the buffer is full, so the
1280          * LOCAL_BUSY state is entered and no more frames are
1281          * acked and reassembled until there is buffer space
1282          * available.
1283          */
1284         if (err < 0 && chan->mode == L2CAP_MODE_ERTM) {
1285                 l2cap_pi(sk)->rx_busy_skb = skb;
1286                 l2cap_chan_busy(chan, 1);
1287                 err = 0;
1288         }
1289 
1290 done:
1291         release_sock(sk);
1292 
1293         return err;
1294 }
1295 
1296 static void l2cap_sock_close_cb(struct l2cap_chan *chan)
1297 {
1298         struct sock *sk = chan->data;
1299 
1300         l2cap_sock_kill(sk);
1301 }
1302 
1303 static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err)
1304 {
1305         struct sock *sk = chan->data;
1306         struct sock *parent;
1307 
1308         BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
1309 
1310         /* This callback can be called both for server (BT_LISTEN)
1311          * sockets as well as "normal" ones. To avoid lockdep warnings
1312          * with child socket locking (through l2cap_sock_cleanup_listen)
1313          * we need separation into separate nesting levels. The simplest
1314          * way to accomplish this is to inherit the nesting level used
1315          * for the channel.
1316          */
1317         lock_sock_nested(sk, atomic_read(&chan->nesting));
1318 
1319         parent = bt_sk(sk)->parent;
1320 
1321         sock_set_flag(sk, SOCK_ZAPPED);
1322 
1323         switch (chan->state) {
1324         case BT_OPEN:
1325         case BT_BOUND:
1326         case BT_CLOSED:
1327                 break;
1328         case BT_LISTEN:
1329                 l2cap_sock_cleanup_listen(sk);
1330                 sk->sk_state = BT_CLOSED;
1331                 chan->state = BT_CLOSED;
1332 
1333                 break;
1334         default:
1335                 sk->sk_state = BT_CLOSED;
1336                 chan->state = BT_CLOSED;
1337 
1338                 sk->sk_err = err;
1339 
1340                 if (parent) {
1341                         bt_accept_unlink(sk);
1342                         parent->sk_data_ready(parent);
1343                 } else {
1344                         sk->sk_state_change(sk);
1345                 }
1346 
1347                 break;
1348         }
1349 
1350         release_sock(sk);
1351 }
1352 
1353 static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state,
1354                                        int err)
1355 {
1356         struct sock *sk = chan->data;
1357 
1358         sk->sk_state = state;
1359 
1360         if (err)
1361                 sk->sk_err = err;
1362 }
1363 
1364 static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan,
1365                                                unsigned long hdr_len,
1366                                                unsigned long len, int nb)
1367 {
1368         struct sock *sk = chan->data;
1369         struct sk_buff *skb;
1370         int err;
1371 
1372         l2cap_chan_unlock(chan);
1373         skb = bt_skb_send_alloc(sk, hdr_len + len, nb, &err);
1374         l2cap_chan_lock(chan);
1375 
1376         if (!skb)
1377                 return ERR_PTR(err);
1378 
1379         skb->priority = sk->sk_priority;
1380 
1381         bt_cb(skb)->l2cap.chan = chan;
1382 
1383         return skb;
1384 }
1385 
1386 static void l2cap_sock_ready_cb(struct l2cap_chan *chan)
1387 {
1388         struct sock *sk = chan->data;
1389         struct sock *parent;
1390 
1391         lock_sock(sk);
1392 
1393         parent = bt_sk(sk)->parent;
1394 
1395         BT_DBG("sk %p, parent %p", sk, parent);
1396 
1397         sk->sk_state = BT_CONNECTED;
1398         sk->sk_state_change(sk);
1399 
1400         if (parent)
1401                 parent->sk_data_ready(parent);
1402 
1403         release_sock(sk);
1404 }
1405 
1406 static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
1407 {
1408         struct sock *parent, *sk = chan->data;
1409 
1410         lock_sock(sk);
1411 
1412         parent = bt_sk(sk)->parent;
1413         if (parent)
1414                 parent->sk_data_ready(parent);
1415 
1416         release_sock(sk);
1417 }
1418 
1419 static void l2cap_sock_resume_cb(struct l2cap_chan *chan)
1420 {
1421         struct sock *sk = chan->data;
1422 
1423         if (test_and_clear_bit(FLAG_PENDING_SECURITY, &chan->flags)) {
1424                 sk->sk_state = BT_CONNECTED;
1425                 chan->state = BT_CONNECTED;
1426         }
1427 
1428         clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1429         sk->sk_state_change(sk);
1430 }
1431 
1432 static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan)
1433 {
1434         struct sock *sk = chan->data;
1435 
1436         lock_sock(sk);
1437         sk->sk_shutdown = SHUTDOWN_MASK;
1438         release_sock(sk);
1439 }
1440 
1441 static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan)
1442 {
1443         struct sock *sk = chan->data;
1444 
1445         return sk->sk_sndtimeo;
1446 }
1447 
1448 static void l2cap_sock_suspend_cb(struct l2cap_chan *chan)
1449 {
1450         struct sock *sk = chan->data;
1451 
1452         set_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
1453         sk->sk_state_change(sk);
1454 }
1455 
1456 static const struct l2cap_ops l2cap_chan_ops = {
1457         .name                   = "L2CAP Socket Interface",
1458         .new_connection         = l2cap_sock_new_connection_cb,
1459         .recv                   = l2cap_sock_recv_cb,
1460         .close                  = l2cap_sock_close_cb,
1461         .teardown               = l2cap_sock_teardown_cb,
1462         .state_change           = l2cap_sock_state_change_cb,
1463         .ready                  = l2cap_sock_ready_cb,
1464         .defer                  = l2cap_sock_defer_cb,
1465         .resume                 = l2cap_sock_resume_cb,
1466         .suspend                = l2cap_sock_suspend_cb,
1467         .set_shutdown           = l2cap_sock_set_shutdown_cb,
1468         .get_sndtimeo           = l2cap_sock_get_sndtimeo_cb,
1469         .alloc_skb              = l2cap_sock_alloc_skb_cb,
1470 };
1471 
1472 static void l2cap_sock_destruct(struct sock *sk)
1473 {
1474         BT_DBG("sk %p", sk);
1475 
1476         if (l2cap_pi(sk)->chan)
1477                 l2cap_chan_put(l2cap_pi(sk)->chan);
1478 
1479         if (l2cap_pi(sk)->rx_busy_skb) {
1480                 kfree_skb(l2cap_pi(sk)->rx_busy_skb);
1481                 l2cap_pi(sk)->rx_busy_skb = NULL;
1482         }
1483 
1484         skb_queue_purge(&sk->sk_receive_queue);
1485         skb_queue_purge(&sk->sk_write_queue);
1486 }
1487 
1488 static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name,
1489                                int *msg_namelen)
1490 {
1491         DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name);
1492 
1493         memset(la, 0, sizeof(struct sockaddr_l2));
1494         la->l2_family = AF_BLUETOOTH;
1495         la->l2_psm = bt_cb(skb)->l2cap.psm;
1496         bacpy(&la->l2_bdaddr, &bt_cb(skb)->l2cap.bdaddr);
1497 
1498         *msg_namelen = sizeof(struct sockaddr_l2);
1499 }
1500 
1501 static void l2cap_sock_init(struct sock *sk, struct sock *parent)
1502 {
1503         struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1504 
1505         BT_DBG("sk %p", sk);
1506 
1507         if (parent) {
1508                 struct l2cap_chan *pchan = l2cap_pi(parent)->chan;
1509 
1510                 sk->sk_type = parent->sk_type;
1511                 bt_sk(sk)->flags = bt_sk(parent)->flags;
1512 
1513                 chan->chan_type = pchan->chan_type;
1514                 chan->imtu = pchan->imtu;
1515                 chan->omtu = pchan->omtu;
1516                 chan->conf_state = pchan->conf_state;
1517                 chan->mode = pchan->mode;
1518                 chan->fcs  = pchan->fcs;
1519                 chan->max_tx = pchan->max_tx;
1520                 chan->tx_win = pchan->tx_win;
1521                 chan->tx_win_max = pchan->tx_win_max;
1522                 chan->sec_level = pchan->sec_level;
1523                 chan->flags = pchan->flags;
1524                 chan->tx_credits = pchan->tx_credits;
1525                 chan->rx_credits = pchan->rx_credits;
1526 
1527                 if (chan->chan_type == L2CAP_CHAN_FIXED) {
1528                         chan->scid = pchan->scid;
1529                         chan->dcid = pchan->scid;
1530                 }
1531 
1532                 security_sk_clone(parent, sk);
1533         } else {
1534                 switch (sk->sk_type) {
1535                 case SOCK_RAW:
1536                         chan->chan_type = L2CAP_CHAN_RAW;
1537                         break;
1538                 case SOCK_DGRAM:
1539                         chan->chan_type = L2CAP_CHAN_CONN_LESS;
1540                         bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name;
1541                         break;
1542                 case SOCK_SEQPACKET:
1543                 case SOCK_STREAM:
1544                         chan->chan_type = L2CAP_CHAN_CONN_ORIENTED;
1545                         break;
1546                 }
1547 
1548                 chan->imtu = L2CAP_DEFAULT_MTU;
1549                 chan->omtu = 0;
1550                 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
1551                         chan->mode = L2CAP_MODE_ERTM;
1552                         set_bit(CONF_STATE2_DEVICE, &chan->conf_state);
1553                 } else {
1554                         chan->mode = L2CAP_MODE_BASIC;
1555                 }
1556 
1557                 l2cap_chan_set_defaults(chan);
1558         }
1559 
1560         /* Default config options */
1561         chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
1562 
1563         chan->data = sk;
1564         chan->ops = &l2cap_chan_ops;
1565 }
1566 
1567 static struct proto l2cap_proto = {
1568         .name           = "L2CAP",
1569         .owner          = THIS_MODULE,
1570         .obj_size       = sizeof(struct l2cap_pinfo)
1571 };
1572 
1573 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock,
1574                                      int proto, gfp_t prio, int kern)
1575 {
1576         struct sock *sk;
1577         struct l2cap_chan *chan;
1578 
1579         sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto, kern);
1580         if (!sk)
1581                 return NULL;
1582 
1583         sock_init_data(sock, sk);
1584         INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
1585 
1586         sk->sk_destruct = l2cap_sock_destruct;
1587         sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
1588 
1589         sock_reset_flag(sk, SOCK_ZAPPED);
1590 
1591         sk->sk_protocol = proto;
1592         sk->sk_state = BT_OPEN;
1593 
1594         chan = l2cap_chan_create();
1595         if (!chan) {
1596                 sk_free(sk);
1597                 return NULL;
1598         }
1599 
1600         l2cap_chan_hold(chan);
1601 
1602         l2cap_pi(sk)->chan = chan;
1603 
1604         return sk;
1605 }
1606 
1607 static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
1608                              int kern)
1609 {
1610         struct sock *sk;
1611 
1612         BT_DBG("sock %p", sock);
1613 
1614         sock->state = SS_UNCONNECTED;
1615 
1616         if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1617             sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1618                 return -ESOCKTNOSUPPORT;
1619 
1620         if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1621                 return -EPERM;
1622 
1623         sock->ops = &l2cap_sock_ops;
1624 
1625         sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
1626         if (!sk)
1627                 return -ENOMEM;
1628 
1629         l2cap_sock_init(sk, NULL);
1630         bt_sock_link(&l2cap_sk_list, sk);
1631         return 0;
1632 }
1633 
1634 static const struct proto_ops l2cap_sock_ops = {
1635         .family         = PF_BLUETOOTH,
1636         .owner          = THIS_MODULE,
1637         .release        = l2cap_sock_release,
1638         .bind           = l2cap_sock_bind,
1639         .connect        = l2cap_sock_connect,
1640         .listen         = l2cap_sock_listen,
1641         .accept         = l2cap_sock_accept,
1642         .getname        = l2cap_sock_getname,
1643         .sendmsg        = l2cap_sock_sendmsg,
1644         .recvmsg        = l2cap_sock_recvmsg,
1645         .poll           = bt_sock_poll,
1646         .ioctl          = bt_sock_ioctl,
1647         .mmap           = sock_no_mmap,
1648         .socketpair     = sock_no_socketpair,
1649         .shutdown       = l2cap_sock_shutdown,
1650         .setsockopt     = l2cap_sock_setsockopt,
1651         .getsockopt     = l2cap_sock_getsockopt
1652 };
1653 
1654 static const struct net_proto_family l2cap_sock_family_ops = {
1655         .family = PF_BLUETOOTH,
1656         .owner  = THIS_MODULE,
1657         .create = l2cap_sock_create,
1658 };
1659 
1660 int __init l2cap_init_sockets(void)
1661 {
1662         int err;
1663 
1664         BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr));
1665 
1666         err = proto_register(&l2cap_proto, 0);
1667         if (err < 0)
1668                 return err;
1669 
1670         err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
1671         if (err < 0) {
1672                 BT_ERR("L2CAP socket registration failed");
1673                 goto error;
1674         }
1675 
1676         err = bt_procfs_init(&init_net, "l2cap", &l2cap_sk_list,
1677                              NULL);
1678         if (err < 0) {
1679                 BT_ERR("Failed to create L2CAP proc file");
1680                 bt_sock_unregister(BTPROTO_L2CAP);
1681                 goto error;
1682         }
1683 
1684         BT_INFO("L2CAP socket layer initialized");
1685 
1686         return 0;
1687 
1688 error:
1689         proto_unregister(&l2cap_proto);
1690         return err;
1691 }
1692 
1693 void l2cap_cleanup_sockets(void)
1694 {
1695         bt_procfs_cleanup(&init_net, "l2cap");
1696         bt_sock_unregister(BTPROTO_L2CAP);
1697         proto_unregister(&l2cap_proto);
1698 }
1699 

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