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 | #include <linux/filter.h> |
33 | #include <linux/sched/signal.h> |
34 | |
35 | #include <net/bluetooth/bluetooth.h> |
36 | #include <net/bluetooth/hci_core.h> |
37 | #include <net/bluetooth/l2cap.h> |
38 | |
39 | #include "smp.h" |
40 | |
41 | static struct bt_sock_list l2cap_sk_list = { |
42 | .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) |
43 | }; |
44 | |
45 | static const struct proto_ops l2cap_sock_ops; |
46 | static void l2cap_sock_init(struct sock *sk, struct sock *parent); |
47 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, |
48 | int proto, gfp_t prio, int kern); |
49 | static void l2cap_sock_cleanup_listen(struct sock *parent); |
50 | |
51 | bool l2cap_is_socket(struct socket *sock) |
52 | { |
53 | return sock && sock->ops == &l2cap_sock_ops; |
54 | } |
55 | EXPORT_SYMBOL(l2cap_is_socket); |
56 | |
57 | static int l2cap_validate_bredr_psm(u16 psm) |
58 | { |
59 | /* PSM must be odd and lsb of upper byte must be 0 */ |
60 | if ((psm & 0x0101) != 0x0001) |
61 | return -EINVAL; |
62 | |
63 | /* Restrict usage of well-known PSMs */ |
64 | if (psm < L2CAP_PSM_DYN_START && !capable(CAP_NET_BIND_SERVICE)) |
65 | return -EACCES; |
66 | |
67 | return 0; |
68 | } |
69 | |
70 | static int l2cap_validate_le_psm(u16 psm) |
71 | { |
72 | /* Valid LE_PSM ranges are defined only until 0x00ff */ |
73 | if (psm > L2CAP_PSM_LE_DYN_END) |
74 | return -EINVAL; |
75 | |
76 | /* Restrict fixed, SIG assigned PSM values to CAP_NET_BIND_SERVICE */ |
77 | if (psm < L2CAP_PSM_LE_DYN_START && !capable(CAP_NET_BIND_SERVICE)) |
78 | return -EACCES; |
79 | |
80 | return 0; |
81 | } |
82 | |
83 | static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) |
84 | { |
85 | struct sock *sk = sock->sk; |
86 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
87 | struct sockaddr_l2 la; |
88 | int len, err = 0; |
89 | |
90 | BT_DBG("sk %p" , sk); |
91 | |
92 | if (!addr || alen < offsetofend(struct sockaddr, sa_family) || |
93 | addr->sa_family != AF_BLUETOOTH) |
94 | return -EINVAL; |
95 | |
96 | memset(&la, 0, sizeof(la)); |
97 | len = min_t(unsigned int, sizeof(la), alen); |
98 | memcpy(&la, addr, len); |
99 | |
100 | if (la.l2_cid && la.l2_psm) |
101 | return -EINVAL; |
102 | |
103 | if (!bdaddr_type_is_valid(type: la.l2_bdaddr_type)) |
104 | return -EINVAL; |
105 | |
106 | if (bdaddr_type_is_le(type: la.l2_bdaddr_type)) { |
107 | /* We only allow ATT user space socket */ |
108 | if (la.l2_cid && |
109 | la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) |
110 | return -EINVAL; |
111 | } |
112 | |
113 | lock_sock(sk); |
114 | |
115 | if (sk->sk_state != BT_OPEN) { |
116 | err = -EBADFD; |
117 | goto done; |
118 | } |
119 | |
120 | if (la.l2_psm) { |
121 | __u16 psm = __le16_to_cpu(la.l2_psm); |
122 | |
123 | if (la.l2_bdaddr_type == BDADDR_BREDR) |
124 | err = l2cap_validate_bredr_psm(psm); |
125 | else |
126 | err = l2cap_validate_le_psm(psm); |
127 | |
128 | if (err) |
129 | goto done; |
130 | } |
131 | |
132 | bacpy(dst: &chan->src, src: &la.l2_bdaddr); |
133 | chan->src_type = la.l2_bdaddr_type; |
134 | |
135 | if (la.l2_cid) |
136 | err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid)); |
137 | else |
138 | err = l2cap_add_psm(chan, src: &la.l2_bdaddr, psm: la.l2_psm); |
139 | |
140 | if (err < 0) |
141 | goto done; |
142 | |
143 | switch (chan->chan_type) { |
144 | case L2CAP_CHAN_CONN_LESS: |
145 | if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_3DSP) |
146 | chan->sec_level = BT_SECURITY_SDP; |
147 | break; |
148 | case L2CAP_CHAN_CONN_ORIENTED: |
149 | if (__le16_to_cpu(la.l2_psm) == L2CAP_PSM_SDP || |
150 | __le16_to_cpu(la.l2_psm) == L2CAP_PSM_RFCOMM) |
151 | chan->sec_level = BT_SECURITY_SDP; |
152 | break; |
153 | case L2CAP_CHAN_RAW: |
154 | chan->sec_level = BT_SECURITY_SDP; |
155 | break; |
156 | case L2CAP_CHAN_FIXED: |
157 | /* Fixed channels default to the L2CAP core not holding a |
158 | * hci_conn reference for them. For fixed channels mapping to |
159 | * L2CAP sockets we do want to hold a reference so set the |
160 | * appropriate flag to request it. |
161 | */ |
162 | set_bit(nr: FLAG_HOLD_HCI_CONN, addr: &chan->flags); |
163 | break; |
164 | } |
165 | |
166 | /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and |
167 | * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set. |
168 | */ |
169 | if (chan->psm && bdaddr_type_is_le(type: chan->src_type) && |
170 | chan->mode != L2CAP_MODE_EXT_FLOWCTL) |
171 | chan->mode = L2CAP_MODE_LE_FLOWCTL; |
172 | |
173 | chan->state = BT_BOUND; |
174 | sk->sk_state = BT_BOUND; |
175 | |
176 | done: |
177 | release_sock(sk); |
178 | return err; |
179 | } |
180 | |
181 | static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, |
182 | int alen, int flags) |
183 | { |
184 | struct sock *sk = sock->sk; |
185 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
186 | struct sockaddr_l2 la; |
187 | int len, err = 0; |
188 | bool zapped; |
189 | |
190 | BT_DBG("sk %p" , sk); |
191 | |
192 | lock_sock(sk); |
193 | zapped = sock_flag(sk, flag: SOCK_ZAPPED); |
194 | release_sock(sk); |
195 | |
196 | if (zapped) |
197 | return -EINVAL; |
198 | |
199 | if (!addr || alen < offsetofend(struct sockaddr, sa_family) || |
200 | addr->sa_family != AF_BLUETOOTH) |
201 | return -EINVAL; |
202 | |
203 | memset(&la, 0, sizeof(la)); |
204 | len = min_t(unsigned int, sizeof(la), alen); |
205 | memcpy(&la, addr, len); |
206 | |
207 | if (la.l2_cid && la.l2_psm) |
208 | return -EINVAL; |
209 | |
210 | if (!bdaddr_type_is_valid(type: la.l2_bdaddr_type)) |
211 | return -EINVAL; |
212 | |
213 | /* Check that the socket wasn't bound to something that |
214 | * conflicts with the address given to connect(). If chan->src |
215 | * is BDADDR_ANY it means bind() was never used, in which case |
216 | * chan->src_type and la.l2_bdaddr_type do not need to match. |
217 | */ |
218 | if (chan->src_type == BDADDR_BREDR && bacmp(ba1: &chan->src, BDADDR_ANY) && |
219 | bdaddr_type_is_le(type: la.l2_bdaddr_type)) { |
220 | /* Old user space versions will try to incorrectly bind |
221 | * the ATT socket using BDADDR_BREDR. We need to accept |
222 | * this and fix up the source address type only when |
223 | * both the source CID and destination CID indicate |
224 | * ATT. Anything else is an invalid combination. |
225 | */ |
226 | if (chan->scid != L2CAP_CID_ATT || |
227 | la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) |
228 | return -EINVAL; |
229 | |
230 | /* We don't have the hdev available here to make a |
231 | * better decision on random vs public, but since all |
232 | * user space versions that exhibit this issue anyway do |
233 | * not support random local addresses assuming public |
234 | * here is good enough. |
235 | */ |
236 | chan->src_type = BDADDR_LE_PUBLIC; |
237 | } |
238 | |
239 | if (chan->src_type != BDADDR_BREDR && la.l2_bdaddr_type == BDADDR_BREDR) |
240 | return -EINVAL; |
241 | |
242 | if (bdaddr_type_is_le(type: la.l2_bdaddr_type)) { |
243 | /* We only allow ATT user space socket */ |
244 | if (la.l2_cid && |
245 | la.l2_cid != cpu_to_le16(L2CAP_CID_ATT)) |
246 | return -EINVAL; |
247 | } |
248 | |
249 | /* Use L2CAP_MODE_LE_FLOWCTL (CoC) in case of LE address and |
250 | * L2CAP_MODE_EXT_FLOWCTL (ECRED) has not been set. |
251 | */ |
252 | if (chan->psm && bdaddr_type_is_le(type: chan->src_type) && |
253 | chan->mode != L2CAP_MODE_EXT_FLOWCTL) |
254 | chan->mode = L2CAP_MODE_LE_FLOWCTL; |
255 | |
256 | err = l2cap_chan_connect(chan, psm: la.l2_psm, __le16_to_cpu(la.l2_cid), |
257 | dst: &la.l2_bdaddr, dst_type: la.l2_bdaddr_type); |
258 | if (err) |
259 | return err; |
260 | |
261 | lock_sock(sk); |
262 | |
263 | err = bt_sock_wait_state(sk, state: BT_CONNECTED, |
264 | timeo: sock_sndtimeo(sk, noblock: flags & O_NONBLOCK)); |
265 | |
266 | release_sock(sk); |
267 | |
268 | return err; |
269 | } |
270 | |
271 | static int l2cap_sock_listen(struct socket *sock, int backlog) |
272 | { |
273 | struct sock *sk = sock->sk; |
274 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
275 | int err = 0; |
276 | |
277 | BT_DBG("sk %p backlog %d" , sk, backlog); |
278 | |
279 | lock_sock(sk); |
280 | |
281 | if (sk->sk_state != BT_BOUND) { |
282 | err = -EBADFD; |
283 | goto done; |
284 | } |
285 | |
286 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) { |
287 | err = -EINVAL; |
288 | goto done; |
289 | } |
290 | |
291 | switch (chan->mode) { |
292 | case L2CAP_MODE_BASIC: |
293 | case L2CAP_MODE_LE_FLOWCTL: |
294 | break; |
295 | case L2CAP_MODE_EXT_FLOWCTL: |
296 | if (!enable_ecred) { |
297 | err = -EOPNOTSUPP; |
298 | goto done; |
299 | } |
300 | break; |
301 | case L2CAP_MODE_ERTM: |
302 | case L2CAP_MODE_STREAMING: |
303 | if (!disable_ertm) |
304 | break; |
305 | fallthrough; |
306 | default: |
307 | err = -EOPNOTSUPP; |
308 | goto done; |
309 | } |
310 | |
311 | sk->sk_max_ack_backlog = backlog; |
312 | sk->sk_ack_backlog = 0; |
313 | |
314 | /* Listening channels need to use nested locking in order not to |
315 | * cause lockdep warnings when the created child channels end up |
316 | * being locked in the same thread as the parent channel. |
317 | */ |
318 | atomic_set(v: &chan->nesting, i: L2CAP_NESTING_PARENT); |
319 | |
320 | chan->state = BT_LISTEN; |
321 | sk->sk_state = BT_LISTEN; |
322 | |
323 | done: |
324 | release_sock(sk); |
325 | return err; |
326 | } |
327 | |
328 | static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, |
329 | int flags, bool kern) |
330 | { |
331 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
332 | struct sock *sk = sock->sk, *nsk; |
333 | long timeo; |
334 | int err = 0; |
335 | |
336 | lock_sock_nested(sk, subclass: L2CAP_NESTING_PARENT); |
337 | |
338 | timeo = sock_rcvtimeo(sk, noblock: flags & O_NONBLOCK); |
339 | |
340 | BT_DBG("sk %p timeo %ld" , sk, timeo); |
341 | |
342 | /* Wait for an incoming connection. (wake-one). */ |
343 | add_wait_queue_exclusive(wq_head: sk_sleep(sk), wq_entry: &wait); |
344 | while (1) { |
345 | if (sk->sk_state != BT_LISTEN) { |
346 | err = -EBADFD; |
347 | break; |
348 | } |
349 | |
350 | nsk = bt_accept_dequeue(parent: sk, newsock); |
351 | if (nsk) |
352 | break; |
353 | |
354 | if (!timeo) { |
355 | err = -EAGAIN; |
356 | break; |
357 | } |
358 | |
359 | if (signal_pending(current)) { |
360 | err = sock_intr_errno(timeo); |
361 | break; |
362 | } |
363 | |
364 | release_sock(sk); |
365 | |
366 | timeo = wait_woken(wq_entry: &wait, TASK_INTERRUPTIBLE, timeout: timeo); |
367 | |
368 | lock_sock_nested(sk, subclass: L2CAP_NESTING_PARENT); |
369 | } |
370 | remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
371 | |
372 | if (err) |
373 | goto done; |
374 | |
375 | newsock->state = SS_CONNECTED; |
376 | |
377 | BT_DBG("new socket %p" , nsk); |
378 | |
379 | done: |
380 | release_sock(sk); |
381 | return err; |
382 | } |
383 | |
384 | static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, |
385 | int peer) |
386 | { |
387 | struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; |
388 | struct sock *sk = sock->sk; |
389 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
390 | |
391 | BT_DBG("sock %p, sk %p" , sock, sk); |
392 | |
393 | if (peer && sk->sk_state != BT_CONNECTED && |
394 | sk->sk_state != BT_CONNECT && sk->sk_state != BT_CONNECT2 && |
395 | sk->sk_state != BT_CONFIG) |
396 | return -ENOTCONN; |
397 | |
398 | memset(la, 0, sizeof(struct sockaddr_l2)); |
399 | addr->sa_family = AF_BLUETOOTH; |
400 | |
401 | la->l2_psm = chan->psm; |
402 | |
403 | if (peer) { |
404 | bacpy(dst: &la->l2_bdaddr, src: &chan->dst); |
405 | la->l2_cid = cpu_to_le16(chan->dcid); |
406 | la->l2_bdaddr_type = chan->dst_type; |
407 | } else { |
408 | bacpy(dst: &la->l2_bdaddr, src: &chan->src); |
409 | la->l2_cid = cpu_to_le16(chan->scid); |
410 | la->l2_bdaddr_type = chan->src_type; |
411 | } |
412 | |
413 | return sizeof(struct sockaddr_l2); |
414 | } |
415 | |
416 | static int l2cap_get_mode(struct l2cap_chan *chan) |
417 | { |
418 | switch (chan->mode) { |
419 | case L2CAP_MODE_BASIC: |
420 | return BT_MODE_BASIC; |
421 | case L2CAP_MODE_ERTM: |
422 | return BT_MODE_ERTM; |
423 | case L2CAP_MODE_STREAMING: |
424 | return BT_MODE_STREAMING; |
425 | case L2CAP_MODE_LE_FLOWCTL: |
426 | return BT_MODE_LE_FLOWCTL; |
427 | case L2CAP_MODE_EXT_FLOWCTL: |
428 | return BT_MODE_EXT_FLOWCTL; |
429 | } |
430 | |
431 | return -EINVAL; |
432 | } |
433 | |
434 | static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, |
435 | char __user *optval, int __user *optlen) |
436 | { |
437 | struct sock *sk = sock->sk; |
438 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
439 | struct l2cap_options opts; |
440 | struct l2cap_conninfo cinfo; |
441 | int len, err = 0; |
442 | u32 opt; |
443 | |
444 | BT_DBG("sk %p" , sk); |
445 | |
446 | if (get_user(len, optlen)) |
447 | return -EFAULT; |
448 | |
449 | lock_sock(sk); |
450 | |
451 | switch (optname) { |
452 | case L2CAP_OPTIONS: |
453 | /* LE sockets should use BT_SNDMTU/BT_RCVMTU, but since |
454 | * legacy ATT code depends on getsockopt for |
455 | * L2CAP_OPTIONS we need to let this pass. |
456 | */ |
457 | if (bdaddr_type_is_le(type: chan->src_type) && |
458 | chan->scid != L2CAP_CID_ATT) { |
459 | err = -EINVAL; |
460 | break; |
461 | } |
462 | |
463 | /* Only BR/EDR modes are supported here */ |
464 | switch (chan->mode) { |
465 | case L2CAP_MODE_BASIC: |
466 | case L2CAP_MODE_ERTM: |
467 | case L2CAP_MODE_STREAMING: |
468 | break; |
469 | default: |
470 | err = -EINVAL; |
471 | break; |
472 | } |
473 | |
474 | if (err < 0) |
475 | break; |
476 | |
477 | memset(&opts, 0, sizeof(opts)); |
478 | opts.imtu = chan->imtu; |
479 | opts.omtu = chan->omtu; |
480 | opts.flush_to = chan->flush_to; |
481 | opts.mode = chan->mode; |
482 | opts.fcs = chan->fcs; |
483 | opts.max_tx = chan->max_tx; |
484 | opts.txwin_size = chan->tx_win; |
485 | |
486 | BT_DBG("mode 0x%2.2x" , chan->mode); |
487 | |
488 | len = min_t(unsigned int, len, sizeof(opts)); |
489 | if (copy_to_user(to: optval, from: (char *) &opts, n: len)) |
490 | err = -EFAULT; |
491 | |
492 | break; |
493 | |
494 | case L2CAP_LM: |
495 | switch (chan->sec_level) { |
496 | case BT_SECURITY_LOW: |
497 | opt = L2CAP_LM_AUTH; |
498 | break; |
499 | case BT_SECURITY_MEDIUM: |
500 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; |
501 | break; |
502 | case BT_SECURITY_HIGH: |
503 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | |
504 | L2CAP_LM_SECURE; |
505 | break; |
506 | case BT_SECURITY_FIPS: |
507 | opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | |
508 | L2CAP_LM_SECURE | L2CAP_LM_FIPS; |
509 | break; |
510 | default: |
511 | opt = 0; |
512 | break; |
513 | } |
514 | |
515 | if (test_bit(FLAG_ROLE_SWITCH, &chan->flags)) |
516 | opt |= L2CAP_LM_MASTER; |
517 | |
518 | if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags)) |
519 | opt |= L2CAP_LM_RELIABLE; |
520 | |
521 | if (put_user(opt, (u32 __user *) optval)) |
522 | err = -EFAULT; |
523 | |
524 | break; |
525 | |
526 | case L2CAP_CONNINFO: |
527 | if (sk->sk_state != BT_CONNECTED && |
528 | !(sk->sk_state == BT_CONNECT2 && |
529 | test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) { |
530 | err = -ENOTCONN; |
531 | break; |
532 | } |
533 | |
534 | memset(&cinfo, 0, sizeof(cinfo)); |
535 | cinfo.hci_handle = chan->conn->hcon->handle; |
536 | memcpy(cinfo.dev_class, chan->conn->hcon->dev_class, 3); |
537 | |
538 | len = min_t(unsigned int, len, sizeof(cinfo)); |
539 | if (copy_to_user(to: optval, from: (char *) &cinfo, n: len)) |
540 | err = -EFAULT; |
541 | |
542 | break; |
543 | |
544 | default: |
545 | err = -ENOPROTOOPT; |
546 | break; |
547 | } |
548 | |
549 | release_sock(sk); |
550 | return err; |
551 | } |
552 | |
553 | static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, |
554 | char __user *optval, int __user *optlen) |
555 | { |
556 | struct sock *sk = sock->sk; |
557 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
558 | struct bt_security sec; |
559 | struct bt_power pwr; |
560 | u32 phys; |
561 | int len, mode, err = 0; |
562 | |
563 | BT_DBG("sk %p" , sk); |
564 | |
565 | if (level == SOL_L2CAP) |
566 | return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); |
567 | |
568 | if (level != SOL_BLUETOOTH) |
569 | return -ENOPROTOOPT; |
570 | |
571 | if (get_user(len, optlen)) |
572 | return -EFAULT; |
573 | |
574 | lock_sock(sk); |
575 | |
576 | switch (optname) { |
577 | case BT_SECURITY: |
578 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && |
579 | chan->chan_type != L2CAP_CHAN_FIXED && |
580 | chan->chan_type != L2CAP_CHAN_RAW) { |
581 | err = -EINVAL; |
582 | break; |
583 | } |
584 | |
585 | memset(&sec, 0, sizeof(sec)); |
586 | if (chan->conn) { |
587 | sec.level = chan->conn->hcon->sec_level; |
588 | |
589 | if (sk->sk_state == BT_CONNECTED) |
590 | sec.key_size = chan->conn->hcon->enc_key_size; |
591 | } else { |
592 | sec.level = chan->sec_level; |
593 | } |
594 | |
595 | len = min_t(unsigned int, len, sizeof(sec)); |
596 | if (copy_to_user(to: optval, from: (char *) &sec, n: len)) |
597 | err = -EFAULT; |
598 | |
599 | break; |
600 | |
601 | case BT_DEFER_SETUP: |
602 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { |
603 | err = -EINVAL; |
604 | break; |
605 | } |
606 | |
607 | if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags), |
608 | (u32 __user *) optval)) |
609 | err = -EFAULT; |
610 | |
611 | break; |
612 | |
613 | case BT_FLUSHABLE: |
614 | if (put_user(test_bit(FLAG_FLUSHABLE, &chan->flags), |
615 | (u32 __user *) optval)) |
616 | err = -EFAULT; |
617 | |
618 | break; |
619 | |
620 | case BT_POWER: |
621 | if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM |
622 | && sk->sk_type != SOCK_RAW) { |
623 | err = -EINVAL; |
624 | break; |
625 | } |
626 | |
627 | pwr.force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags); |
628 | |
629 | len = min_t(unsigned int, len, sizeof(pwr)); |
630 | if (copy_to_user(to: optval, from: (char *) &pwr, n: len)) |
631 | err = -EFAULT; |
632 | |
633 | break; |
634 | |
635 | case BT_CHANNEL_POLICY: |
636 | if (put_user(chan->chan_policy, (u32 __user *) optval)) |
637 | err = -EFAULT; |
638 | break; |
639 | |
640 | case BT_SNDMTU: |
641 | if (!bdaddr_type_is_le(type: chan->src_type)) { |
642 | err = -EINVAL; |
643 | break; |
644 | } |
645 | |
646 | if (sk->sk_state != BT_CONNECTED) { |
647 | err = -ENOTCONN; |
648 | break; |
649 | } |
650 | |
651 | if (put_user(chan->omtu, (u16 __user *) optval)) |
652 | err = -EFAULT; |
653 | break; |
654 | |
655 | case BT_RCVMTU: |
656 | if (!bdaddr_type_is_le(type: chan->src_type)) { |
657 | err = -EINVAL; |
658 | break; |
659 | } |
660 | |
661 | if (put_user(chan->imtu, (u16 __user *) optval)) |
662 | err = -EFAULT; |
663 | break; |
664 | |
665 | case BT_PHY: |
666 | if (sk->sk_state != BT_CONNECTED) { |
667 | err = -ENOTCONN; |
668 | break; |
669 | } |
670 | |
671 | phys = hci_conn_get_phy(conn: chan->conn->hcon); |
672 | |
673 | if (put_user(phys, (u32 __user *) optval)) |
674 | err = -EFAULT; |
675 | break; |
676 | |
677 | case BT_MODE: |
678 | if (!enable_ecred) { |
679 | err = -ENOPROTOOPT; |
680 | break; |
681 | } |
682 | |
683 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
684 | err = -EINVAL; |
685 | break; |
686 | } |
687 | |
688 | mode = l2cap_get_mode(chan); |
689 | if (mode < 0) { |
690 | err = mode; |
691 | break; |
692 | } |
693 | |
694 | if (put_user(mode, (u8 __user *) optval)) |
695 | err = -EFAULT; |
696 | break; |
697 | |
698 | default: |
699 | err = -ENOPROTOOPT; |
700 | break; |
701 | } |
702 | |
703 | release_sock(sk); |
704 | return err; |
705 | } |
706 | |
707 | static bool l2cap_valid_mtu(struct l2cap_chan *chan, u16 mtu) |
708 | { |
709 | switch (chan->scid) { |
710 | case L2CAP_CID_ATT: |
711 | if (mtu < L2CAP_LE_MIN_MTU) |
712 | return false; |
713 | break; |
714 | |
715 | default: |
716 | if (mtu < L2CAP_DEFAULT_MIN_MTU) |
717 | return false; |
718 | } |
719 | |
720 | return true; |
721 | } |
722 | |
723 | static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, |
724 | sockptr_t optval, unsigned int optlen) |
725 | { |
726 | struct sock *sk = sock->sk; |
727 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
728 | struct l2cap_options opts; |
729 | int len, err = 0; |
730 | u32 opt; |
731 | |
732 | BT_DBG("sk %p" , sk); |
733 | |
734 | lock_sock(sk); |
735 | |
736 | switch (optname) { |
737 | case L2CAP_OPTIONS: |
738 | if (bdaddr_type_is_le(type: chan->src_type)) { |
739 | err = -EINVAL; |
740 | break; |
741 | } |
742 | |
743 | if (sk->sk_state == BT_CONNECTED) { |
744 | err = -EINVAL; |
745 | break; |
746 | } |
747 | |
748 | opts.imtu = chan->imtu; |
749 | opts.omtu = chan->omtu; |
750 | opts.flush_to = chan->flush_to; |
751 | opts.mode = chan->mode; |
752 | opts.fcs = chan->fcs; |
753 | opts.max_tx = chan->max_tx; |
754 | opts.txwin_size = chan->tx_win; |
755 | |
756 | len = min_t(unsigned int, sizeof(opts), optlen); |
757 | if (copy_from_sockptr(dst: &opts, src: optval, size: len)) { |
758 | err = -EFAULT; |
759 | break; |
760 | } |
761 | |
762 | if (opts.txwin_size > L2CAP_DEFAULT_EXT_WINDOW) { |
763 | err = -EINVAL; |
764 | break; |
765 | } |
766 | |
767 | if (!l2cap_valid_mtu(chan, mtu: opts.imtu)) { |
768 | err = -EINVAL; |
769 | break; |
770 | } |
771 | |
772 | /* Only BR/EDR modes are supported here */ |
773 | switch (opts.mode) { |
774 | case L2CAP_MODE_BASIC: |
775 | clear_bit(nr: CONF_STATE2_DEVICE, addr: &chan->conf_state); |
776 | break; |
777 | case L2CAP_MODE_ERTM: |
778 | case L2CAP_MODE_STREAMING: |
779 | if (!disable_ertm) |
780 | break; |
781 | fallthrough; |
782 | default: |
783 | err = -EINVAL; |
784 | break; |
785 | } |
786 | |
787 | if (err < 0) |
788 | break; |
789 | |
790 | chan->mode = opts.mode; |
791 | |
792 | BT_DBG("mode 0x%2.2x" , chan->mode); |
793 | |
794 | chan->imtu = opts.imtu; |
795 | chan->omtu = opts.omtu; |
796 | chan->fcs = opts.fcs; |
797 | chan->max_tx = opts.max_tx; |
798 | chan->tx_win = opts.txwin_size; |
799 | chan->flush_to = opts.flush_to; |
800 | break; |
801 | |
802 | case L2CAP_LM: |
803 | if (copy_from_sockptr(dst: &opt, src: optval, size: sizeof(u32))) { |
804 | err = -EFAULT; |
805 | break; |
806 | } |
807 | |
808 | if (opt & L2CAP_LM_FIPS) { |
809 | err = -EINVAL; |
810 | break; |
811 | } |
812 | |
813 | if (opt & L2CAP_LM_AUTH) |
814 | chan->sec_level = BT_SECURITY_LOW; |
815 | if (opt & L2CAP_LM_ENCRYPT) |
816 | chan->sec_level = BT_SECURITY_MEDIUM; |
817 | if (opt & L2CAP_LM_SECURE) |
818 | chan->sec_level = BT_SECURITY_HIGH; |
819 | |
820 | if (opt & L2CAP_LM_MASTER) |
821 | set_bit(nr: FLAG_ROLE_SWITCH, addr: &chan->flags); |
822 | else |
823 | clear_bit(nr: FLAG_ROLE_SWITCH, addr: &chan->flags); |
824 | |
825 | if (opt & L2CAP_LM_RELIABLE) |
826 | set_bit(nr: FLAG_FORCE_RELIABLE, addr: &chan->flags); |
827 | else |
828 | clear_bit(nr: FLAG_FORCE_RELIABLE, addr: &chan->flags); |
829 | break; |
830 | |
831 | default: |
832 | err = -ENOPROTOOPT; |
833 | break; |
834 | } |
835 | |
836 | release_sock(sk); |
837 | return err; |
838 | } |
839 | |
840 | static int l2cap_set_mode(struct l2cap_chan *chan, u8 mode) |
841 | { |
842 | switch (mode) { |
843 | case BT_MODE_BASIC: |
844 | if (bdaddr_type_is_le(type: chan->src_type)) |
845 | return -EINVAL; |
846 | mode = L2CAP_MODE_BASIC; |
847 | clear_bit(nr: CONF_STATE2_DEVICE, addr: &chan->conf_state); |
848 | break; |
849 | case BT_MODE_ERTM: |
850 | if (!disable_ertm || bdaddr_type_is_le(type: chan->src_type)) |
851 | return -EINVAL; |
852 | mode = L2CAP_MODE_ERTM; |
853 | break; |
854 | case BT_MODE_STREAMING: |
855 | if (!disable_ertm || bdaddr_type_is_le(type: chan->src_type)) |
856 | return -EINVAL; |
857 | mode = L2CAP_MODE_STREAMING; |
858 | break; |
859 | case BT_MODE_LE_FLOWCTL: |
860 | if (!bdaddr_type_is_le(type: chan->src_type)) |
861 | return -EINVAL; |
862 | mode = L2CAP_MODE_LE_FLOWCTL; |
863 | break; |
864 | case BT_MODE_EXT_FLOWCTL: |
865 | /* TODO: Add support for ECRED PDUs to BR/EDR */ |
866 | if (!bdaddr_type_is_le(type: chan->src_type)) |
867 | return -EINVAL; |
868 | mode = L2CAP_MODE_EXT_FLOWCTL; |
869 | break; |
870 | default: |
871 | return -EINVAL; |
872 | } |
873 | |
874 | chan->mode = mode; |
875 | |
876 | return 0; |
877 | } |
878 | |
879 | static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, |
880 | sockptr_t optval, unsigned int optlen) |
881 | { |
882 | struct sock *sk = sock->sk; |
883 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
884 | struct bt_security sec; |
885 | struct bt_power pwr; |
886 | struct l2cap_conn *conn; |
887 | int len, err = 0; |
888 | u32 opt; |
889 | u16 mtu; |
890 | u8 mode; |
891 | |
892 | BT_DBG("sk %p" , sk); |
893 | |
894 | if (level == SOL_L2CAP) |
895 | return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); |
896 | |
897 | if (level != SOL_BLUETOOTH) |
898 | return -ENOPROTOOPT; |
899 | |
900 | lock_sock(sk); |
901 | |
902 | switch (optname) { |
903 | case BT_SECURITY: |
904 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && |
905 | chan->chan_type != L2CAP_CHAN_FIXED && |
906 | chan->chan_type != L2CAP_CHAN_RAW) { |
907 | err = -EINVAL; |
908 | break; |
909 | } |
910 | |
911 | sec.level = BT_SECURITY_LOW; |
912 | |
913 | len = min_t(unsigned int, sizeof(sec), optlen); |
914 | if (copy_from_sockptr(dst: &sec, src: optval, size: len)) { |
915 | err = -EFAULT; |
916 | break; |
917 | } |
918 | |
919 | if (sec.level < BT_SECURITY_LOW || |
920 | sec.level > BT_SECURITY_FIPS) { |
921 | err = -EINVAL; |
922 | break; |
923 | } |
924 | |
925 | chan->sec_level = sec.level; |
926 | |
927 | if (!chan->conn) |
928 | break; |
929 | |
930 | conn = chan->conn; |
931 | |
932 | /* change security for LE channels */ |
933 | if (chan->scid == L2CAP_CID_ATT) { |
934 | if (smp_conn_security(hcon: conn->hcon, sec_level: sec.level)) { |
935 | err = -EINVAL; |
936 | break; |
937 | } |
938 | |
939 | set_bit(nr: FLAG_PENDING_SECURITY, addr: &chan->flags); |
940 | sk->sk_state = BT_CONFIG; |
941 | chan->state = BT_CONFIG; |
942 | |
943 | /* or for ACL link */ |
944 | } else if ((sk->sk_state == BT_CONNECT2 && |
945 | test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) || |
946 | sk->sk_state == BT_CONNECTED) { |
947 | if (!l2cap_chan_check_security(chan, initiator: true)) |
948 | set_bit(nr: BT_SK_SUSPEND, addr: &bt_sk(sk)->flags); |
949 | else |
950 | sk->sk_state_change(sk); |
951 | } else { |
952 | err = -EINVAL; |
953 | } |
954 | break; |
955 | |
956 | case BT_DEFER_SETUP: |
957 | if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { |
958 | err = -EINVAL; |
959 | break; |
960 | } |
961 | |
962 | if (copy_from_sockptr(dst: &opt, src: optval, size: sizeof(u32))) { |
963 | err = -EFAULT; |
964 | break; |
965 | } |
966 | |
967 | if (opt) { |
968 | set_bit(nr: BT_SK_DEFER_SETUP, addr: &bt_sk(sk)->flags); |
969 | set_bit(nr: FLAG_DEFER_SETUP, addr: &chan->flags); |
970 | } else { |
971 | clear_bit(nr: BT_SK_DEFER_SETUP, addr: &bt_sk(sk)->flags); |
972 | clear_bit(nr: FLAG_DEFER_SETUP, addr: &chan->flags); |
973 | } |
974 | break; |
975 | |
976 | case BT_FLUSHABLE: |
977 | if (copy_from_sockptr(dst: &opt, src: optval, size: sizeof(u32))) { |
978 | err = -EFAULT; |
979 | break; |
980 | } |
981 | |
982 | if (opt > BT_FLUSHABLE_ON) { |
983 | err = -EINVAL; |
984 | break; |
985 | } |
986 | |
987 | if (opt == BT_FLUSHABLE_OFF) { |
988 | conn = chan->conn; |
989 | /* proceed further only when we have l2cap_conn and |
990 | No Flush support in the LM */ |
991 | if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) { |
992 | err = -EINVAL; |
993 | break; |
994 | } |
995 | } |
996 | |
997 | if (opt) |
998 | set_bit(nr: FLAG_FLUSHABLE, addr: &chan->flags); |
999 | else |
1000 | clear_bit(nr: FLAG_FLUSHABLE, addr: &chan->flags); |
1001 | break; |
1002 | |
1003 | case BT_POWER: |
1004 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED && |
1005 | chan->chan_type != L2CAP_CHAN_RAW) { |
1006 | err = -EINVAL; |
1007 | break; |
1008 | } |
1009 | |
1010 | pwr.force_active = BT_POWER_FORCE_ACTIVE_ON; |
1011 | |
1012 | len = min_t(unsigned int, sizeof(pwr), optlen); |
1013 | if (copy_from_sockptr(dst: &pwr, src: optval, size: len)) { |
1014 | err = -EFAULT; |
1015 | break; |
1016 | } |
1017 | |
1018 | if (pwr.force_active) |
1019 | set_bit(nr: FLAG_FORCE_ACTIVE, addr: &chan->flags); |
1020 | else |
1021 | clear_bit(nr: FLAG_FORCE_ACTIVE, addr: &chan->flags); |
1022 | break; |
1023 | |
1024 | case BT_CHANNEL_POLICY: |
1025 | if (copy_from_sockptr(dst: &opt, src: optval, size: sizeof(u32))) { |
1026 | err = -EFAULT; |
1027 | break; |
1028 | } |
1029 | |
1030 | if (opt > BT_CHANNEL_POLICY_AMP_PREFERRED) { |
1031 | err = -EINVAL; |
1032 | break; |
1033 | } |
1034 | |
1035 | if (chan->mode != L2CAP_MODE_ERTM && |
1036 | chan->mode != L2CAP_MODE_STREAMING) { |
1037 | err = -EOPNOTSUPP; |
1038 | break; |
1039 | } |
1040 | |
1041 | chan->chan_policy = (u8) opt; |
1042 | |
1043 | if (sk->sk_state == BT_CONNECTED && |
1044 | chan->move_role == L2CAP_MOVE_ROLE_NONE) |
1045 | l2cap_move_start(chan); |
1046 | |
1047 | break; |
1048 | |
1049 | case BT_SNDMTU: |
1050 | if (!bdaddr_type_is_le(type: chan->src_type)) { |
1051 | err = -EINVAL; |
1052 | break; |
1053 | } |
1054 | |
1055 | /* Setting is not supported as it's the remote side that |
1056 | * decides this. |
1057 | */ |
1058 | err = -EPERM; |
1059 | break; |
1060 | |
1061 | case BT_RCVMTU: |
1062 | if (!bdaddr_type_is_le(type: chan->src_type)) { |
1063 | err = -EINVAL; |
1064 | break; |
1065 | } |
1066 | |
1067 | if (chan->mode == L2CAP_MODE_LE_FLOWCTL && |
1068 | sk->sk_state == BT_CONNECTED) { |
1069 | err = -EISCONN; |
1070 | break; |
1071 | } |
1072 | |
1073 | if (copy_from_sockptr(dst: &mtu, src: optval, size: sizeof(u16))) { |
1074 | err = -EFAULT; |
1075 | break; |
1076 | } |
1077 | |
1078 | if (chan->mode == L2CAP_MODE_EXT_FLOWCTL && |
1079 | sk->sk_state == BT_CONNECTED) |
1080 | err = l2cap_chan_reconfigure(chan, mtu); |
1081 | else |
1082 | chan->imtu = mtu; |
1083 | |
1084 | break; |
1085 | |
1086 | case BT_MODE: |
1087 | if (!enable_ecred) { |
1088 | err = -ENOPROTOOPT; |
1089 | break; |
1090 | } |
1091 | |
1092 | BT_DBG("sk->sk_state %u" , sk->sk_state); |
1093 | |
1094 | if (sk->sk_state != BT_BOUND) { |
1095 | err = -EINVAL; |
1096 | break; |
1097 | } |
1098 | |
1099 | if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) { |
1100 | err = -EINVAL; |
1101 | break; |
1102 | } |
1103 | |
1104 | if (copy_from_sockptr(dst: &mode, src: optval, size: sizeof(u8))) { |
1105 | err = -EFAULT; |
1106 | break; |
1107 | } |
1108 | |
1109 | BT_DBG("mode %u" , mode); |
1110 | |
1111 | err = l2cap_set_mode(chan, mode); |
1112 | if (err) |
1113 | break; |
1114 | |
1115 | BT_DBG("mode 0x%2.2x" , chan->mode); |
1116 | |
1117 | break; |
1118 | |
1119 | default: |
1120 | err = -ENOPROTOOPT; |
1121 | break; |
1122 | } |
1123 | |
1124 | release_sock(sk); |
1125 | return err; |
1126 | } |
1127 | |
1128 | static int l2cap_sock_sendmsg(struct socket *sock, struct msghdr *msg, |
1129 | size_t len) |
1130 | { |
1131 | struct sock *sk = sock->sk; |
1132 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
1133 | int err; |
1134 | |
1135 | BT_DBG("sock %p, sk %p" , sock, sk); |
1136 | |
1137 | err = sock_error(sk); |
1138 | if (err) |
1139 | return err; |
1140 | |
1141 | if (msg->msg_flags & MSG_OOB) |
1142 | return -EOPNOTSUPP; |
1143 | |
1144 | if (sk->sk_state != BT_CONNECTED) |
1145 | return -ENOTCONN; |
1146 | |
1147 | lock_sock(sk); |
1148 | err = bt_sock_wait_ready(sk, msg_flags: msg->msg_flags); |
1149 | release_sock(sk); |
1150 | if (err) |
1151 | return err; |
1152 | |
1153 | l2cap_chan_lock(chan); |
1154 | err = l2cap_chan_send(chan, msg, len); |
1155 | l2cap_chan_unlock(chan); |
1156 | |
1157 | return err; |
1158 | } |
1159 | |
1160 | static int l2cap_sock_recvmsg(struct socket *sock, struct msghdr *msg, |
1161 | size_t len, int flags) |
1162 | { |
1163 | struct sock *sk = sock->sk; |
1164 | struct l2cap_pinfo *pi = l2cap_pi(sk); |
1165 | int err; |
1166 | |
1167 | lock_sock(sk); |
1168 | |
1169 | if (sk->sk_state == BT_CONNECT2 && test_bit(BT_SK_DEFER_SETUP, |
1170 | &bt_sk(sk)->flags)) { |
1171 | if (pi->chan->mode == L2CAP_MODE_EXT_FLOWCTL) { |
1172 | sk->sk_state = BT_CONNECTED; |
1173 | pi->chan->state = BT_CONNECTED; |
1174 | __l2cap_ecred_conn_rsp_defer(chan: pi->chan); |
1175 | } else if (bdaddr_type_is_le(type: pi->chan->src_type)) { |
1176 | sk->sk_state = BT_CONNECTED; |
1177 | pi->chan->state = BT_CONNECTED; |
1178 | __l2cap_le_connect_rsp_defer(chan: pi->chan); |
1179 | } else { |
1180 | sk->sk_state = BT_CONFIG; |
1181 | pi->chan->state = BT_CONFIG; |
1182 | __l2cap_connect_rsp_defer(chan: pi->chan); |
1183 | } |
1184 | |
1185 | err = 0; |
1186 | goto done; |
1187 | } |
1188 | |
1189 | release_sock(sk); |
1190 | |
1191 | if (sock->type == SOCK_STREAM) |
1192 | err = bt_sock_stream_recvmsg(sock, msg, len, flags); |
1193 | else |
1194 | err = bt_sock_recvmsg(sock, msg, len, flags); |
1195 | |
1196 | if (pi->chan->mode != L2CAP_MODE_ERTM) |
1197 | return err; |
1198 | |
1199 | /* Attempt to put pending rx data in the socket buffer */ |
1200 | |
1201 | lock_sock(sk); |
1202 | |
1203 | if (!test_bit(CONN_LOCAL_BUSY, &pi->chan->conn_state)) |
1204 | goto done; |
1205 | |
1206 | if (pi->rx_busy_skb) { |
1207 | if (!__sock_queue_rcv_skb(sk, skb: pi->rx_busy_skb)) |
1208 | pi->rx_busy_skb = NULL; |
1209 | else |
1210 | goto done; |
1211 | } |
1212 | |
1213 | /* Restore data flow when half of the receive buffer is |
1214 | * available. This avoids resending large numbers of |
1215 | * frames. |
1216 | */ |
1217 | if (atomic_read(v: &sk->sk_rmem_alloc) <= sk->sk_rcvbuf >> 1) |
1218 | l2cap_chan_busy(chan: pi->chan, busy: 0); |
1219 | |
1220 | done: |
1221 | release_sock(sk); |
1222 | return err; |
1223 | } |
1224 | |
1225 | /* Kill socket (only if zapped and orphan) |
1226 | * Must be called on unlocked socket, with l2cap channel lock. |
1227 | */ |
1228 | static void l2cap_sock_kill(struct sock *sk) |
1229 | { |
1230 | if (!sock_flag(sk, flag: SOCK_ZAPPED) || sk->sk_socket) |
1231 | return; |
1232 | |
1233 | BT_DBG("sk %p state %s" , sk, state_to_string(sk->sk_state)); |
1234 | |
1235 | /* Kill poor orphan */ |
1236 | |
1237 | l2cap_chan_put(l2cap_pi(sk)->chan); |
1238 | sock_set_flag(sk, flag: SOCK_DEAD); |
1239 | sock_put(sk); |
1240 | } |
1241 | |
1242 | static int __l2cap_wait_ack(struct sock *sk, struct l2cap_chan *chan) |
1243 | { |
1244 | DECLARE_WAITQUEUE(wait, current); |
1245 | int err = 0; |
1246 | int timeo = L2CAP_WAIT_ACK_POLL_PERIOD; |
1247 | /* Timeout to prevent infinite loop */ |
1248 | unsigned long timeout = jiffies + L2CAP_WAIT_ACK_TIMEOUT; |
1249 | |
1250 | add_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
1251 | set_current_state(TASK_INTERRUPTIBLE); |
1252 | do { |
1253 | BT_DBG("Waiting for %d ACKs, timeout %04d ms" , |
1254 | chan->unacked_frames, time_after(jiffies, timeout) ? 0 : |
1255 | jiffies_to_msecs(timeout - jiffies)); |
1256 | |
1257 | if (!timeo) |
1258 | timeo = L2CAP_WAIT_ACK_POLL_PERIOD; |
1259 | |
1260 | if (signal_pending(current)) { |
1261 | err = sock_intr_errno(timeo); |
1262 | break; |
1263 | } |
1264 | |
1265 | release_sock(sk); |
1266 | timeo = schedule_timeout(timeout: timeo); |
1267 | lock_sock(sk); |
1268 | set_current_state(TASK_INTERRUPTIBLE); |
1269 | |
1270 | err = sock_error(sk); |
1271 | if (err) |
1272 | break; |
1273 | |
1274 | if (time_after(jiffies, timeout)) { |
1275 | err = -ENOLINK; |
1276 | break; |
1277 | } |
1278 | |
1279 | } while (chan->unacked_frames > 0 && |
1280 | chan->state == BT_CONNECTED); |
1281 | |
1282 | set_current_state(TASK_RUNNING); |
1283 | remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
1284 | return err; |
1285 | } |
1286 | |
1287 | static int l2cap_sock_shutdown(struct socket *sock, int how) |
1288 | { |
1289 | struct sock *sk = sock->sk; |
1290 | struct l2cap_chan *chan; |
1291 | struct l2cap_conn *conn; |
1292 | int err = 0; |
1293 | |
1294 | BT_DBG("sock %p, sk %p, how %d" , sock, sk, how); |
1295 | |
1296 | /* 'how' parameter is mapped to sk_shutdown as follows: |
1297 | * SHUT_RD (0) --> RCV_SHUTDOWN (1) |
1298 | * SHUT_WR (1) --> SEND_SHUTDOWN (2) |
1299 | * SHUT_RDWR (2) --> SHUTDOWN_MASK (3) |
1300 | */ |
1301 | how++; |
1302 | |
1303 | if (!sk) |
1304 | return 0; |
1305 | |
1306 | lock_sock(sk); |
1307 | |
1308 | if ((sk->sk_shutdown & how) == how) |
1309 | goto shutdown_already; |
1310 | |
1311 | BT_DBG("Handling sock shutdown" ); |
1312 | |
1313 | /* prevent sk structure from being freed whilst unlocked */ |
1314 | sock_hold(sk); |
1315 | |
1316 | chan = l2cap_pi(sk)->chan; |
1317 | /* prevent chan structure from being freed whilst unlocked */ |
1318 | l2cap_chan_hold(c: chan); |
1319 | |
1320 | BT_DBG("chan %p state %s" , chan, state_to_string(chan->state)); |
1321 | |
1322 | if (chan->mode == L2CAP_MODE_ERTM && |
1323 | chan->unacked_frames > 0 && |
1324 | chan->state == BT_CONNECTED) { |
1325 | err = __l2cap_wait_ack(sk, chan); |
1326 | |
1327 | /* After waiting for ACKs, check whether shutdown |
1328 | * has already been actioned to close the L2CAP |
1329 | * link such as by l2cap_disconnection_req(). |
1330 | */ |
1331 | if ((sk->sk_shutdown & how) == how) |
1332 | goto shutdown_matched; |
1333 | } |
1334 | |
1335 | /* Try setting the RCV_SHUTDOWN bit, return early if SEND_SHUTDOWN |
1336 | * is already set |
1337 | */ |
1338 | if ((how & RCV_SHUTDOWN) && !(sk->sk_shutdown & RCV_SHUTDOWN)) { |
1339 | sk->sk_shutdown |= RCV_SHUTDOWN; |
1340 | if ((sk->sk_shutdown & how) == how) |
1341 | goto shutdown_matched; |
1342 | } |
1343 | |
1344 | sk->sk_shutdown |= SEND_SHUTDOWN; |
1345 | release_sock(sk); |
1346 | |
1347 | l2cap_chan_lock(chan); |
1348 | conn = chan->conn; |
1349 | if (conn) |
1350 | /* prevent conn structure from being freed */ |
1351 | l2cap_conn_get(conn); |
1352 | l2cap_chan_unlock(chan); |
1353 | |
1354 | if (conn) |
1355 | /* mutex lock must be taken before l2cap_chan_lock() */ |
1356 | mutex_lock(&conn->chan_lock); |
1357 | |
1358 | l2cap_chan_lock(chan); |
1359 | l2cap_chan_close(chan, reason: 0); |
1360 | l2cap_chan_unlock(chan); |
1361 | |
1362 | if (conn) { |
1363 | mutex_unlock(lock: &conn->chan_lock); |
1364 | l2cap_conn_put(conn); |
1365 | } |
1366 | |
1367 | lock_sock(sk); |
1368 | |
1369 | if (sock_flag(sk, flag: SOCK_LINGER) && sk->sk_lingertime && |
1370 | !(current->flags & PF_EXITING)) |
1371 | err = bt_sock_wait_state(sk, state: BT_CLOSED, |
1372 | timeo: sk->sk_lingertime); |
1373 | |
1374 | shutdown_matched: |
1375 | l2cap_chan_put(c: chan); |
1376 | sock_put(sk); |
1377 | |
1378 | shutdown_already: |
1379 | if (!err && sk->sk_err) |
1380 | err = -sk->sk_err; |
1381 | |
1382 | release_sock(sk); |
1383 | |
1384 | BT_DBG("Sock shutdown complete err: %d" , err); |
1385 | |
1386 | return err; |
1387 | } |
1388 | |
1389 | static int l2cap_sock_release(struct socket *sock) |
1390 | { |
1391 | struct sock *sk = sock->sk; |
1392 | int err; |
1393 | struct l2cap_chan *chan; |
1394 | |
1395 | BT_DBG("sock %p, sk %p" , sock, sk); |
1396 | |
1397 | if (!sk) |
1398 | return 0; |
1399 | |
1400 | l2cap_sock_cleanup_listen(parent: sk); |
1401 | bt_sock_unlink(l: &l2cap_sk_list, s: sk); |
1402 | |
1403 | err = l2cap_sock_shutdown(sock, how: SHUT_RDWR); |
1404 | chan = l2cap_pi(sk)->chan; |
1405 | |
1406 | l2cap_chan_hold(c: chan); |
1407 | l2cap_chan_lock(chan); |
1408 | |
1409 | sock_orphan(sk); |
1410 | l2cap_sock_kill(sk); |
1411 | |
1412 | l2cap_chan_unlock(chan); |
1413 | l2cap_chan_put(c: chan); |
1414 | |
1415 | return err; |
1416 | } |
1417 | |
1418 | static void l2cap_sock_cleanup_listen(struct sock *parent) |
1419 | { |
1420 | struct sock *sk; |
1421 | |
1422 | BT_DBG("parent %p state %s" , parent, |
1423 | state_to_string(parent->sk_state)); |
1424 | |
1425 | /* Close not yet accepted channels */ |
1426 | while ((sk = bt_accept_dequeue(parent, NULL))) { |
1427 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
1428 | |
1429 | BT_DBG("child chan %p state %s" , chan, |
1430 | state_to_string(chan->state)); |
1431 | |
1432 | l2cap_chan_hold(c: chan); |
1433 | l2cap_chan_lock(chan); |
1434 | |
1435 | __clear_chan_timer(chan); |
1436 | l2cap_chan_close(chan, ECONNRESET); |
1437 | l2cap_sock_kill(sk); |
1438 | |
1439 | l2cap_chan_unlock(chan); |
1440 | l2cap_chan_put(c: chan); |
1441 | } |
1442 | } |
1443 | |
1444 | static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan) |
1445 | { |
1446 | struct sock *sk, *parent = chan->data; |
1447 | |
1448 | lock_sock(sk: parent); |
1449 | |
1450 | /* Check for backlog size */ |
1451 | if (sk_acceptq_is_full(sk: parent)) { |
1452 | BT_DBG("backlog full %d" , parent->sk_ack_backlog); |
1453 | release_sock(sk: parent); |
1454 | return NULL; |
1455 | } |
1456 | |
1457 | sk = l2cap_sock_alloc(net: sock_net(sk: parent), NULL, BTPROTO_L2CAP, |
1458 | GFP_ATOMIC, kern: 0); |
1459 | if (!sk) { |
1460 | release_sock(sk: parent); |
1461 | return NULL; |
1462 | } |
1463 | |
1464 | bt_sock_reclassify_lock(sk, BTPROTO_L2CAP); |
1465 | |
1466 | l2cap_sock_init(sk, parent); |
1467 | |
1468 | bt_accept_enqueue(parent, sk, bh: false); |
1469 | |
1470 | release_sock(sk: parent); |
1471 | |
1472 | return l2cap_pi(sk)->chan; |
1473 | } |
1474 | |
1475 | static int l2cap_sock_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb) |
1476 | { |
1477 | struct sock *sk = chan->data; |
1478 | int err; |
1479 | |
1480 | lock_sock(sk); |
1481 | |
1482 | if (l2cap_pi(sk)->rx_busy_skb) { |
1483 | err = -ENOMEM; |
1484 | goto done; |
1485 | } |
1486 | |
1487 | if (chan->mode != L2CAP_MODE_ERTM && |
1488 | chan->mode != L2CAP_MODE_STREAMING) { |
1489 | /* Even if no filter is attached, we could potentially |
1490 | * get errors from security modules, etc. |
1491 | */ |
1492 | err = sk_filter(sk, skb); |
1493 | if (err) |
1494 | goto done; |
1495 | } |
1496 | |
1497 | err = __sock_queue_rcv_skb(sk, skb); |
1498 | |
1499 | /* For ERTM, handle one skb that doesn't fit into the recv |
1500 | * buffer. This is important to do because the data frames |
1501 | * have already been acked, so the skb cannot be discarded. |
1502 | * |
1503 | * Notify the l2cap core that the buffer is full, so the |
1504 | * LOCAL_BUSY state is entered and no more frames are |
1505 | * acked and reassembled until there is buffer space |
1506 | * available. |
1507 | */ |
1508 | if (err < 0 && chan->mode == L2CAP_MODE_ERTM) { |
1509 | l2cap_pi(sk)->rx_busy_skb = skb; |
1510 | l2cap_chan_busy(chan, busy: 1); |
1511 | err = 0; |
1512 | } |
1513 | |
1514 | done: |
1515 | release_sock(sk); |
1516 | |
1517 | return err; |
1518 | } |
1519 | |
1520 | static void l2cap_sock_close_cb(struct l2cap_chan *chan) |
1521 | { |
1522 | struct sock *sk = chan->data; |
1523 | |
1524 | if (!sk) |
1525 | return; |
1526 | |
1527 | l2cap_sock_kill(sk); |
1528 | } |
1529 | |
1530 | static void l2cap_sock_teardown_cb(struct l2cap_chan *chan, int err) |
1531 | { |
1532 | struct sock *sk = chan->data; |
1533 | struct sock *parent; |
1534 | |
1535 | if (!sk) |
1536 | return; |
1537 | |
1538 | BT_DBG("chan %p state %s" , chan, state_to_string(chan->state)); |
1539 | |
1540 | /* This callback can be called both for server (BT_LISTEN) |
1541 | * sockets as well as "normal" ones. To avoid lockdep warnings |
1542 | * with child socket locking (through l2cap_sock_cleanup_listen) |
1543 | * we need separation into separate nesting levels. The simplest |
1544 | * way to accomplish this is to inherit the nesting level used |
1545 | * for the channel. |
1546 | */ |
1547 | lock_sock_nested(sk, subclass: atomic_read(v: &chan->nesting)); |
1548 | |
1549 | parent = bt_sk(sk)->parent; |
1550 | |
1551 | switch (chan->state) { |
1552 | case BT_OPEN: |
1553 | case BT_BOUND: |
1554 | case BT_CLOSED: |
1555 | break; |
1556 | case BT_LISTEN: |
1557 | l2cap_sock_cleanup_listen(parent: sk); |
1558 | sk->sk_state = BT_CLOSED; |
1559 | chan->state = BT_CLOSED; |
1560 | |
1561 | break; |
1562 | default: |
1563 | sk->sk_state = BT_CLOSED; |
1564 | chan->state = BT_CLOSED; |
1565 | |
1566 | sk->sk_err = err; |
1567 | |
1568 | if (parent) { |
1569 | bt_accept_unlink(sk); |
1570 | parent->sk_data_ready(parent); |
1571 | } else { |
1572 | sk->sk_state_change(sk); |
1573 | } |
1574 | |
1575 | break; |
1576 | } |
1577 | release_sock(sk); |
1578 | |
1579 | /* Only zap after cleanup to avoid use after free race */ |
1580 | sock_set_flag(sk, flag: SOCK_ZAPPED); |
1581 | |
1582 | } |
1583 | |
1584 | static void l2cap_sock_state_change_cb(struct l2cap_chan *chan, int state, |
1585 | int err) |
1586 | { |
1587 | struct sock *sk = chan->data; |
1588 | |
1589 | sk->sk_state = state; |
1590 | |
1591 | if (err) |
1592 | sk->sk_err = err; |
1593 | } |
1594 | |
1595 | static struct sk_buff *l2cap_sock_alloc_skb_cb(struct l2cap_chan *chan, |
1596 | unsigned long hdr_len, |
1597 | unsigned long len, int nb) |
1598 | { |
1599 | struct sock *sk = chan->data; |
1600 | struct sk_buff *skb; |
1601 | int err; |
1602 | |
1603 | l2cap_chan_unlock(chan); |
1604 | skb = bt_skb_send_alloc(sk, len: hdr_len + len, nb, err: &err); |
1605 | l2cap_chan_lock(chan); |
1606 | |
1607 | if (!skb) |
1608 | return ERR_PTR(error: err); |
1609 | |
1610 | /* Channel lock is released before requesting new skb and then |
1611 | * reacquired thus we need to recheck channel state. |
1612 | */ |
1613 | if (chan->state != BT_CONNECTED) { |
1614 | kfree_skb(skb); |
1615 | return ERR_PTR(error: -ENOTCONN); |
1616 | } |
1617 | |
1618 | skb->priority = READ_ONCE(sk->sk_priority); |
1619 | |
1620 | bt_cb(skb)->l2cap.chan = chan; |
1621 | |
1622 | return skb; |
1623 | } |
1624 | |
1625 | static void l2cap_sock_ready_cb(struct l2cap_chan *chan) |
1626 | { |
1627 | struct sock *sk = chan->data; |
1628 | struct sock *parent; |
1629 | |
1630 | lock_sock(sk); |
1631 | |
1632 | parent = bt_sk(sk)->parent; |
1633 | |
1634 | BT_DBG("sk %p, parent %p" , sk, parent); |
1635 | |
1636 | sk->sk_state = BT_CONNECTED; |
1637 | sk->sk_state_change(sk); |
1638 | |
1639 | if (parent) |
1640 | parent->sk_data_ready(parent); |
1641 | |
1642 | release_sock(sk); |
1643 | } |
1644 | |
1645 | static void l2cap_sock_defer_cb(struct l2cap_chan *chan) |
1646 | { |
1647 | struct sock *parent, *sk = chan->data; |
1648 | |
1649 | lock_sock(sk); |
1650 | |
1651 | parent = bt_sk(sk)->parent; |
1652 | if (parent) |
1653 | parent->sk_data_ready(parent); |
1654 | |
1655 | release_sock(sk); |
1656 | } |
1657 | |
1658 | static void l2cap_sock_resume_cb(struct l2cap_chan *chan) |
1659 | { |
1660 | struct sock *sk = chan->data; |
1661 | |
1662 | if (test_and_clear_bit(nr: FLAG_PENDING_SECURITY, addr: &chan->flags)) { |
1663 | sk->sk_state = BT_CONNECTED; |
1664 | chan->state = BT_CONNECTED; |
1665 | } |
1666 | |
1667 | clear_bit(nr: BT_SK_SUSPEND, addr: &bt_sk(sk)->flags); |
1668 | sk->sk_state_change(sk); |
1669 | } |
1670 | |
1671 | static void l2cap_sock_set_shutdown_cb(struct l2cap_chan *chan) |
1672 | { |
1673 | struct sock *sk = chan->data; |
1674 | |
1675 | lock_sock(sk); |
1676 | sk->sk_shutdown = SHUTDOWN_MASK; |
1677 | release_sock(sk); |
1678 | } |
1679 | |
1680 | static long l2cap_sock_get_sndtimeo_cb(struct l2cap_chan *chan) |
1681 | { |
1682 | struct sock *sk = chan->data; |
1683 | |
1684 | return sk->sk_sndtimeo; |
1685 | } |
1686 | |
1687 | static struct pid *l2cap_sock_get_peer_pid_cb(struct l2cap_chan *chan) |
1688 | { |
1689 | struct sock *sk = chan->data; |
1690 | |
1691 | return sk->sk_peer_pid; |
1692 | } |
1693 | |
1694 | static void l2cap_sock_suspend_cb(struct l2cap_chan *chan) |
1695 | { |
1696 | struct sock *sk = chan->data; |
1697 | |
1698 | set_bit(nr: BT_SK_SUSPEND, addr: &bt_sk(sk)->flags); |
1699 | sk->sk_state_change(sk); |
1700 | } |
1701 | |
1702 | static int l2cap_sock_filter(struct l2cap_chan *chan, struct sk_buff *skb) |
1703 | { |
1704 | struct sock *sk = chan->data; |
1705 | |
1706 | switch (chan->mode) { |
1707 | case L2CAP_MODE_ERTM: |
1708 | case L2CAP_MODE_STREAMING: |
1709 | return sk_filter(sk, skb); |
1710 | } |
1711 | |
1712 | return 0; |
1713 | } |
1714 | |
1715 | static const struct l2cap_ops l2cap_chan_ops = { |
1716 | .name = "L2CAP Socket Interface" , |
1717 | .new_connection = l2cap_sock_new_connection_cb, |
1718 | .recv = l2cap_sock_recv_cb, |
1719 | .close = l2cap_sock_close_cb, |
1720 | .teardown = l2cap_sock_teardown_cb, |
1721 | .state_change = l2cap_sock_state_change_cb, |
1722 | .ready = l2cap_sock_ready_cb, |
1723 | .defer = l2cap_sock_defer_cb, |
1724 | .resume = l2cap_sock_resume_cb, |
1725 | .suspend = l2cap_sock_suspend_cb, |
1726 | .set_shutdown = l2cap_sock_set_shutdown_cb, |
1727 | .get_sndtimeo = l2cap_sock_get_sndtimeo_cb, |
1728 | .get_peer_pid = l2cap_sock_get_peer_pid_cb, |
1729 | .alloc_skb = l2cap_sock_alloc_skb_cb, |
1730 | .filter = l2cap_sock_filter, |
1731 | }; |
1732 | |
1733 | static void l2cap_sock_destruct(struct sock *sk) |
1734 | { |
1735 | BT_DBG("sk %p" , sk); |
1736 | |
1737 | if (l2cap_pi(sk)->chan) { |
1738 | l2cap_pi(sk)->chan->data = NULL; |
1739 | l2cap_chan_put(l2cap_pi(sk)->chan); |
1740 | } |
1741 | |
1742 | if (l2cap_pi(sk)->rx_busy_skb) { |
1743 | kfree_skb(l2cap_pi(sk)->rx_busy_skb); |
1744 | l2cap_pi(sk)->rx_busy_skb = NULL; |
1745 | } |
1746 | |
1747 | skb_queue_purge(list: &sk->sk_receive_queue); |
1748 | skb_queue_purge(list: &sk->sk_write_queue); |
1749 | } |
1750 | |
1751 | static void l2cap_skb_msg_name(struct sk_buff *skb, void *msg_name, |
1752 | int *msg_namelen) |
1753 | { |
1754 | DECLARE_SOCKADDR(struct sockaddr_l2 *, la, msg_name); |
1755 | |
1756 | memset(la, 0, sizeof(struct sockaddr_l2)); |
1757 | la->l2_family = AF_BLUETOOTH; |
1758 | la->l2_psm = bt_cb(skb)->l2cap.psm; |
1759 | bacpy(dst: &la->l2_bdaddr, src: &bt_cb(skb)->l2cap.bdaddr); |
1760 | |
1761 | *msg_namelen = sizeof(struct sockaddr_l2); |
1762 | } |
1763 | |
1764 | static void l2cap_sock_init(struct sock *sk, struct sock *parent) |
1765 | { |
1766 | struct l2cap_chan *chan = l2cap_pi(sk)->chan; |
1767 | |
1768 | BT_DBG("sk %p" , sk); |
1769 | |
1770 | if (parent) { |
1771 | struct l2cap_chan *pchan = l2cap_pi(parent)->chan; |
1772 | |
1773 | sk->sk_type = parent->sk_type; |
1774 | bt_sk(sk)->flags = bt_sk(parent)->flags; |
1775 | |
1776 | chan->chan_type = pchan->chan_type; |
1777 | chan->imtu = pchan->imtu; |
1778 | chan->omtu = pchan->omtu; |
1779 | chan->conf_state = pchan->conf_state; |
1780 | chan->mode = pchan->mode; |
1781 | chan->fcs = pchan->fcs; |
1782 | chan->max_tx = pchan->max_tx; |
1783 | chan->tx_win = pchan->tx_win; |
1784 | chan->tx_win_max = pchan->tx_win_max; |
1785 | chan->sec_level = pchan->sec_level; |
1786 | chan->flags = pchan->flags; |
1787 | chan->tx_credits = pchan->tx_credits; |
1788 | chan->rx_credits = pchan->rx_credits; |
1789 | |
1790 | if (chan->chan_type == L2CAP_CHAN_FIXED) { |
1791 | chan->scid = pchan->scid; |
1792 | chan->dcid = pchan->scid; |
1793 | } |
1794 | |
1795 | security_sk_clone(sk: parent, newsk: sk); |
1796 | } else { |
1797 | switch (sk->sk_type) { |
1798 | case SOCK_RAW: |
1799 | chan->chan_type = L2CAP_CHAN_RAW; |
1800 | break; |
1801 | case SOCK_DGRAM: |
1802 | chan->chan_type = L2CAP_CHAN_CONN_LESS; |
1803 | bt_sk(sk)->skb_msg_name = l2cap_skb_msg_name; |
1804 | break; |
1805 | case SOCK_SEQPACKET: |
1806 | case SOCK_STREAM: |
1807 | chan->chan_type = L2CAP_CHAN_CONN_ORIENTED; |
1808 | break; |
1809 | } |
1810 | |
1811 | chan->imtu = L2CAP_DEFAULT_MTU; |
1812 | chan->omtu = 0; |
1813 | if (!disable_ertm && sk->sk_type == SOCK_STREAM) { |
1814 | chan->mode = L2CAP_MODE_ERTM; |
1815 | set_bit(nr: CONF_STATE2_DEVICE, addr: &chan->conf_state); |
1816 | } else { |
1817 | chan->mode = L2CAP_MODE_BASIC; |
1818 | } |
1819 | |
1820 | l2cap_chan_set_defaults(chan); |
1821 | } |
1822 | |
1823 | /* Default config options */ |
1824 | chan->flush_to = L2CAP_DEFAULT_FLUSH_TO; |
1825 | |
1826 | chan->data = sk; |
1827 | chan->ops = &l2cap_chan_ops; |
1828 | } |
1829 | |
1830 | static struct proto l2cap_proto = { |
1831 | .name = "L2CAP" , |
1832 | .owner = THIS_MODULE, |
1833 | .obj_size = sizeof(struct l2cap_pinfo) |
1834 | }; |
1835 | |
1836 | static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, |
1837 | int proto, gfp_t prio, int kern) |
1838 | { |
1839 | struct sock *sk; |
1840 | struct l2cap_chan *chan; |
1841 | |
1842 | sk = bt_sock_alloc(net, sock, prot: &l2cap_proto, proto, prio, kern); |
1843 | if (!sk) |
1844 | return NULL; |
1845 | |
1846 | sk->sk_destruct = l2cap_sock_destruct; |
1847 | sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT; |
1848 | |
1849 | chan = l2cap_chan_create(); |
1850 | if (!chan) { |
1851 | sk_free(sk); |
1852 | return NULL; |
1853 | } |
1854 | |
1855 | l2cap_chan_hold(c: chan); |
1856 | |
1857 | l2cap_pi(sk)->chan = chan; |
1858 | |
1859 | return sk; |
1860 | } |
1861 | |
1862 | static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, |
1863 | int kern) |
1864 | { |
1865 | struct sock *sk; |
1866 | |
1867 | BT_DBG("sock %p" , sock); |
1868 | |
1869 | sock->state = SS_UNCONNECTED; |
1870 | |
1871 | if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && |
1872 | sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) |
1873 | return -ESOCKTNOSUPPORT; |
1874 | |
1875 | if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
1876 | return -EPERM; |
1877 | |
1878 | sock->ops = &l2cap_sock_ops; |
1879 | |
1880 | sk = l2cap_sock_alloc(net, sock, proto: protocol, GFP_ATOMIC, kern); |
1881 | if (!sk) |
1882 | return -ENOMEM; |
1883 | |
1884 | l2cap_sock_init(sk, NULL); |
1885 | bt_sock_link(l: &l2cap_sk_list, s: sk); |
1886 | return 0; |
1887 | } |
1888 | |
1889 | static const struct proto_ops l2cap_sock_ops = { |
1890 | .family = PF_BLUETOOTH, |
1891 | .owner = THIS_MODULE, |
1892 | .release = l2cap_sock_release, |
1893 | .bind = l2cap_sock_bind, |
1894 | .connect = l2cap_sock_connect, |
1895 | .listen = l2cap_sock_listen, |
1896 | .accept = l2cap_sock_accept, |
1897 | .getname = l2cap_sock_getname, |
1898 | .sendmsg = l2cap_sock_sendmsg, |
1899 | .recvmsg = l2cap_sock_recvmsg, |
1900 | .poll = bt_sock_poll, |
1901 | .ioctl = bt_sock_ioctl, |
1902 | .gettstamp = sock_gettstamp, |
1903 | .mmap = sock_no_mmap, |
1904 | .socketpair = sock_no_socketpair, |
1905 | .shutdown = l2cap_sock_shutdown, |
1906 | .setsockopt = l2cap_sock_setsockopt, |
1907 | .getsockopt = l2cap_sock_getsockopt |
1908 | }; |
1909 | |
1910 | static const struct net_proto_family l2cap_sock_family_ops = { |
1911 | .family = PF_BLUETOOTH, |
1912 | .owner = THIS_MODULE, |
1913 | .create = l2cap_sock_create, |
1914 | }; |
1915 | |
1916 | int __init l2cap_init_sockets(void) |
1917 | { |
1918 | int err; |
1919 | |
1920 | BUILD_BUG_ON(sizeof(struct sockaddr_l2) > sizeof(struct sockaddr)); |
1921 | |
1922 | err = proto_register(prot: &l2cap_proto, alloc_slab: 0); |
1923 | if (err < 0) |
1924 | return err; |
1925 | |
1926 | err = bt_sock_register(BTPROTO_L2CAP, ops: &l2cap_sock_family_ops); |
1927 | if (err < 0) { |
1928 | BT_ERR("L2CAP socket registration failed" ); |
1929 | goto error; |
1930 | } |
1931 | |
1932 | err = bt_procfs_init(net: &init_net, name: "l2cap" , sk_list: &l2cap_sk_list, |
1933 | NULL); |
1934 | if (err < 0) { |
1935 | BT_ERR("Failed to create L2CAP proc file" ); |
1936 | bt_sock_unregister(BTPROTO_L2CAP); |
1937 | goto error; |
1938 | } |
1939 | |
1940 | BT_INFO("L2CAP socket layer initialized" ); |
1941 | |
1942 | return 0; |
1943 | |
1944 | error: |
1945 | proto_unregister(prot: &l2cap_proto); |
1946 | return err; |
1947 | } |
1948 | |
1949 | void l2cap_cleanup_sockets(void) |
1950 | { |
1951 | bt_procfs_cleanup(net: &init_net, name: "l2cap" ); |
1952 | bt_sock_unregister(BTPROTO_L2CAP); |
1953 | proto_unregister(prot: &l2cap_proto); |
1954 | } |
1955 | |