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Bluetooth: move l2cap_sock_setsockopt() to l2cap_sock.c
[deliverable/linux.git] / net / bluetooth / l2cap_sock.c
CommitLineData
bb58f747
GP		 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
7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License version 2 as
11 published by the Free Software Foundation;
12
13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
16 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
17 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
18 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21
22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
24 SOFTWARE IS DISCLAIMED.
25*/
26
27/* Bluetooth L2CAP sockets. */
28
29#include <net/bluetooth/bluetooth.h>
33575df7 30#include <net/bluetooth/hci_core.h>
bb58f747
GP		 31#include <net/bluetooth/l2cap.h>
32
33static void l2cap_sock_timeout(unsigned long arg)
34{
35 struct sock *sk = (struct sock *) arg;
36 int reason;
37
38 BT_DBG("sock %p state %d", sk, sk->sk_state);
39
40 bh_lock_sock(sk);
41
42 if (sock_owned_by_user(sk)) {
43 /* sk is owned by user. Try again later */
44 l2cap_sock_set_timer(sk, HZ / 5);
45 bh_unlock_sock(sk);
46 sock_put(sk);
47 return;
48 }
49
50 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
51 reason = ECONNREFUSED;
52 else if (sk->sk_state == BT_CONNECT &&
53 l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
54 reason = ECONNREFUSED;
55 else
56 reason = ETIMEDOUT;
57
58 __l2cap_sock_close(sk, reason);
59
60 bh_unlock_sock(sk);
61
62 l2cap_sock_kill(sk);
63 sock_put(sk);
64}
65
af6bcd82
GP		 66static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
67{
68 struct sock *sk;
69 struct hlist_node *node;
70 sk_for_each(sk, node, &l2cap_sk_list.head)
71 if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
72 goto found;
73 sk = NULL;
74found:
75 return sk;
76}
77
78static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
79{
80 struct sock *sk = sock->sk;
81 struct sockaddr_l2 la;
82 int len, err = 0;
83
84 BT_DBG("sk %p", sk);
85
86 if (!addr || addr->sa_family != AF_BLUETOOTH)
87 return -EINVAL;
88
89 memset(&la, 0, sizeof(la));
90 len = min_t(unsigned int, sizeof(la), alen);
91 memcpy(&la, addr, len);
92
93 if (la.l2_cid)
94 return -EINVAL;
95
96 lock_sock(sk);
97
98 if (sk->sk_state != BT_OPEN) {
99 err = -EBADFD;
100 goto done;
101 }
102
103 if (la.l2_psm) {
104 __u16 psm = __le16_to_cpu(la.l2_psm);
105
106 /* PSM must be odd and lsb of upper byte must be 0 */
107 if ((psm & 0x0101) != 0x0001) {
108 err = -EINVAL;
109 goto done;
110 }
111
112 /* Restrict usage of well-known PSMs */
113 if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
114 err = -EACCES;
115 goto done;
116 }
117 }
118
119 write_lock_bh(&l2cap_sk_list.lock);
120
121 if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
122 err = -EADDRINUSE;
123 } else {
124 /* Save source address */
125 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
126 l2cap_pi(sk)->psm = la.l2_psm;
127 l2cap_pi(sk)->sport = la.l2_psm;
128 sk->sk_state = BT_BOUND;
129
130 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
131 __le16_to_cpu(la.l2_psm) == 0x0003)
132 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
133 }
134
135 write_unlock_bh(&l2cap_sk_list.lock);
136
137done:
138 release_sock(sk);
139 return err;
140}
141
142static int l2cap_sock_listen(struct socket *sock, int backlog)
143{
144 struct sock *sk = sock->sk;
145 int err = 0;
146
147 BT_DBG("sk %p backlog %d", sk, backlog);
148
149 lock_sock(sk);
150
151 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
152 || sk->sk_state != BT_BOUND) {
153 err = -EBADFD;
154 goto done;
155 }
156
157 switch (l2cap_pi(sk)->mode) {
158 case L2CAP_MODE_BASIC:
159 break;
160 case L2CAP_MODE_ERTM:
161 case L2CAP_MODE_STREAMING:
162 if (!disable_ertm)
163 break;
164 /* fall through */
165 default:
166 err = -ENOTSUPP;
167 goto done;
168 }
169
170 if (!l2cap_pi(sk)->psm) {
171 bdaddr_t *src = &bt_sk(sk)->src;
172 u16 psm;
173
174 err = -EINVAL;
175
176 write_lock_bh(&l2cap_sk_list.lock);
177
178 for (psm = 0x1001; psm < 0x1100; psm += 2)
179 if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
180 l2cap_pi(sk)->psm = cpu_to_le16(psm);
181 l2cap_pi(sk)->sport = cpu_to_le16(psm);
182 err = 0;
183 break;
184 }
185
186 write_unlock_bh(&l2cap_sk_list.lock);
187
188 if (err < 0)
189 goto done;
190 }
191
192 sk->sk_max_ack_backlog = backlog;
193 sk->sk_ack_backlog = 0;
194 sk->sk_state = BT_LISTEN;
195
196done:
197 release_sock(sk);
198 return err;
199}
200
c47b7c72
GP		 201static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
202{
203 DECLARE_WAITQUEUE(wait, current);
204 struct sock *sk = sock->sk, *nsk;
205 long timeo;
206 int err = 0;
207
208 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
209
210 if (sk->sk_state != BT_LISTEN) {
211 err = -EBADFD;
212 goto done;
213 }
214
215 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
216
217 BT_DBG("sk %p timeo %ld", sk, timeo);
218
219 /* Wait for an incoming connection. (wake-one). */
220 add_wait_queue_exclusive(sk_sleep(sk), &wait);
221 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
222 set_current_state(TASK_INTERRUPTIBLE);
223 if (!timeo) {
224 err = -EAGAIN;
225 break;
226 }
227
228 release_sock(sk);
229 timeo = schedule_timeout(timeo);
230 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
231
232 if (sk->sk_state != BT_LISTEN) {
233 err = -EBADFD;
234 break;
235 }
236
237 if (signal_pending(current)) {
238 err = sock_intr_errno(timeo);
239 break;
240 }
241 }
242 set_current_state(TASK_RUNNING);
243 remove_wait_queue(sk_sleep(sk), &wait);
244
245 if (err)
246 goto done;
247
248 newsock->state = SS_CONNECTED;
249
250 BT_DBG("new socket %p", nsk);
251
252done:
253 release_sock(sk);
254 return err;
255}
256
d7175d55
GP		 257static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
258{
259 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
260 struct sock *sk = sock->sk;
261
262 BT_DBG("sock %p, sk %p", sock, sk);
263
264 addr->sa_family = AF_BLUETOOTH;
265 *len = sizeof(struct sockaddr_l2);
266
267 if (peer) {
268 la->l2_psm = l2cap_pi(sk)->psm;
269 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
270 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
271 } else {
272 la->l2_psm = l2cap_pi(sk)->sport;
273 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
274 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
275 }
276
277 return 0;
278}
279
33575df7
GP		 280static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
281{
282 struct sock *sk = sock->sk;
283 struct l2cap_options opts;
284 int len, err = 0;
285 u32 opt;
286
287 BT_DBG("sk %p", sk);
288
289 lock_sock(sk);
290
291 switch (optname) {
292 case L2CAP_OPTIONS:
293 if (sk->sk_state == BT_CONNECTED) {
294 err = -EINVAL;
295 break;
296 }
297
298 opts.imtu = l2cap_pi(sk)->imtu;
299 opts.omtu = l2cap_pi(sk)->omtu;
300 opts.flush_to = l2cap_pi(sk)->flush_to;
301 opts.mode = l2cap_pi(sk)->mode;
302 opts.fcs = l2cap_pi(sk)->fcs;
303 opts.max_tx = l2cap_pi(sk)->max_tx;
304 opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
305
306 len = min_t(unsigned int, sizeof(opts), optlen);
307 if (copy_from_user((char *) &opts, optval, len)) {
308 err = -EFAULT;
309 break;
310 }
311
312 if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
313 err = -EINVAL;
314 break;
315 }
316
317 l2cap_pi(sk)->mode = opts.mode;
318 switch (l2cap_pi(sk)->mode) {
319 case L2CAP_MODE_BASIC:
320 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE;
321 break;
322 case L2CAP_MODE_ERTM:
323 case L2CAP_MODE_STREAMING:
324 if (!disable_ertm)
325 break;
326 /* fall through */
327 default:
328 err = -EINVAL;
329 break;
330 }
331
332 l2cap_pi(sk)->imtu = opts.imtu;
333 l2cap_pi(sk)->omtu = opts.omtu;
334 l2cap_pi(sk)->fcs = opts.fcs;
335 l2cap_pi(sk)->max_tx = opts.max_tx;
336 l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size;
337 break;
338
339 case L2CAP_LM:
340 if (get_user(opt, (u32 __user *) optval)) {
341 err = -EFAULT;
342 break;
343 }
344
345 if (opt & L2CAP_LM_AUTH)
346 l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
347 if (opt & L2CAP_LM_ENCRYPT)
348 l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
349 if (opt & L2CAP_LM_SECURE)
350 l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
351
352 l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
353 l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
354 break;
355
356 default:
357 err = -ENOPROTOOPT;
358 break;
359 }
360
361 release_sock(sk);
362 return err;
363}
364
365static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
366{
367 struct sock *sk = sock->sk;
368 struct bt_security sec;
369 int len, err = 0;
370 u32 opt;
371
372 BT_DBG("sk %p", sk);
373
374 if (level == SOL_L2CAP)
375 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
376
377 if (level != SOL_BLUETOOTH)
378 return -ENOPROTOOPT;
379
380 lock_sock(sk);
381
382 switch (optname) {
383 case BT_SECURITY:
384 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
385 && sk->sk_type != SOCK_RAW) {
386 err = -EINVAL;
387 break;
388 }
389
390 sec.level = BT_SECURITY_LOW;
391
392 len = min_t(unsigned int, sizeof(sec), optlen);
393 if (copy_from_user((char *) &sec, optval, len)) {
394 err = -EFAULT;
395 break;
396 }
397
398 if (sec.level < BT_SECURITY_LOW ||
399 sec.level > BT_SECURITY_HIGH) {
400 err = -EINVAL;
401 break;
402 }
403
404 l2cap_pi(sk)->sec_level = sec.level;
405 break;
406
407 case BT_DEFER_SETUP:
408 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
409 err = -EINVAL;
410 break;
411 }
412
413 if (get_user(opt, (u32 __user *) optval)) {
414 err = -EFAULT;
415 break;
416 }
417
418 bt_sk(sk)->defer_setup = opt;
419 break;
420
421 case BT_FLUSHABLE:
422 if (get_user(opt, (u32 __user *) optval)) {
423 err = -EFAULT;
424 break;
425 }
426
427 if (opt > BT_FLUSHABLE_ON) {
428 err = -EINVAL;
429 break;
430 }
431
432 if (opt == BT_FLUSHABLE_OFF) {
433 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
434 /* proceed futher only when we have l2cap_conn and
435 No Flush support in the LM */
436 if (!conn || !lmp_no_flush_capable(conn->hcon->hdev)) {
437 err = -EINVAL;
438 break;
439 }
440 }
441
442 l2cap_pi(sk)->flushable = opt;
443 break;
444
445 default:
446 err = -ENOPROTOOPT;
447 break;
448 }
449
450 release_sock(sk);
451 return err;
452}
453
554f05bb
GP		 454static int l2cap_sock_release(struct socket *sock)
455{
456 struct sock *sk = sock->sk;
457 int err;
458
459 BT_DBG("sock %p, sk %p", sock, sk);
460
461 if (!sk)
462 return 0;
463
464 err = l2cap_sock_shutdown(sock, 2);
465
466 sock_orphan(sk);
467 l2cap_sock_kill(sk);
468 return err;
469}
470
bb58f747
GP		 471static void l2cap_sock_destruct(struct sock *sk)
472{
473 BT_DBG("sk %p", sk);
474
475 skb_queue_purge(&sk->sk_receive_queue);
476 skb_queue_purge(&sk->sk_write_queue);
477}
478
479void l2cap_sock_init(struct sock *sk, struct sock *parent)
480{
481 struct l2cap_pinfo *pi = l2cap_pi(sk);
482
483 BT_DBG("sk %p", sk);
484
485 if (parent) {
486 sk->sk_type = parent->sk_type;
487 bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
488
489 pi->imtu = l2cap_pi(parent)->imtu;
490 pi->omtu = l2cap_pi(parent)->omtu;
491 pi->conf_state = l2cap_pi(parent)->conf_state;
492 pi->mode = l2cap_pi(parent)->mode;
493 pi->fcs = l2cap_pi(parent)->fcs;
494 pi->max_tx = l2cap_pi(parent)->max_tx;
495 pi->tx_win = l2cap_pi(parent)->tx_win;
496 pi->sec_level = l2cap_pi(parent)->sec_level;
497 pi->role_switch = l2cap_pi(parent)->role_switch;
498 pi->force_reliable = l2cap_pi(parent)->force_reliable;
499 pi->flushable = l2cap_pi(parent)->flushable;
500 } else {
501 pi->imtu = L2CAP_DEFAULT_MTU;
502 pi->omtu = 0;
503 if (!disable_ertm && sk->sk_type == SOCK_STREAM) {
504 pi->mode = L2CAP_MODE_ERTM;
505 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
506 } else {
507 pi->mode = L2CAP_MODE_BASIC;
508 }
509 pi->max_tx = L2CAP_DEFAULT_MAX_TX;
510 pi->fcs = L2CAP_FCS_CRC16;
511 pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
512 pi->sec_level = BT_SECURITY_LOW;
513 pi->role_switch = 0;
514 pi->force_reliable = 0;
515 pi->flushable = BT_FLUSHABLE_OFF;
516 }
517
518 /* Default config options */
519 pi->conf_len = 0;
520 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
521 skb_queue_head_init(TX_QUEUE(sk));
522 skb_queue_head_init(SREJ_QUEUE(sk));
523 skb_queue_head_init(BUSY_QUEUE(sk));
524 INIT_LIST_HEAD(SREJ_LIST(sk));
525}
526
527static struct proto l2cap_proto = {
528 .name = "L2CAP",
529 .owner = THIS_MODULE,
530 .obj_size = sizeof(struct l2cap_pinfo)
531};
532
533struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
534{
535 struct sock *sk;
536
537 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
538 if (!sk)
539 return NULL;
540
541 sock_init_data(sock, sk);
542 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
543
544 sk->sk_destruct = l2cap_sock_destruct;
545 sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
546
547 sock_reset_flag(sk, SOCK_ZAPPED);
548
549 sk->sk_protocol = proto;
550 sk->sk_state = BT_OPEN;
551
552 setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
553
554 bt_sock_link(&l2cap_sk_list, sk);
555 return sk;
556}
557
558static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
559 int kern)
560{
561 struct sock *sk;
562
563 BT_DBG("sock %p", sock);
564
565 sock->state = SS_UNCONNECTED;
566
567 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
568 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
569 return -ESOCKTNOSUPPORT;
570
571 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
572 return -EPERM;
573
574 sock->ops = &l2cap_sock_ops;
575
576 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
577 if (!sk)
578 return -ENOMEM;
579
580 l2cap_sock_init(sk, NULL);
581 return 0;
582}
583
65390587
GP		 584const struct proto_ops l2cap_sock_ops = {
585 .family = PF_BLUETOOTH,
586 .owner = THIS_MODULE,
587 .release = l2cap_sock_release,
588 .bind = l2cap_sock_bind,
589 .connect = l2cap_sock_connect,
590 .listen = l2cap_sock_listen,
591 .accept = l2cap_sock_accept,
592 .getname = l2cap_sock_getname,
593 .sendmsg = l2cap_sock_sendmsg,
594 .recvmsg = l2cap_sock_recvmsg,
595 .poll = bt_sock_poll,
596 .ioctl = bt_sock_ioctl,
597 .mmap = sock_no_mmap,
598 .socketpair = sock_no_socketpair,
599 .shutdown = l2cap_sock_shutdown,
600 .setsockopt = l2cap_sock_setsockopt,
601 .getsockopt = l2cap_sock_getsockopt
602};
603
bb58f747
GP		 604static const struct net_proto_family l2cap_sock_family_ops = {
605 .family = PF_BLUETOOTH,
606 .owner = THIS_MODULE,
607 .create = l2cap_sock_create,
608};
609
610int __init l2cap_init_sockets(void)
611{
612 int err;
613
614 err = proto_register(&l2cap_proto, 0);
615 if (err < 0)
616 return err;
617
618 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
619 if (err < 0)
620 goto error;
621
622 BT_INFO("L2CAP socket layer initialized");
623
624 return 0;
625
626error:
627 BT_ERR("L2CAP socket registration failed");
628 proto_unregister(&l2cap_proto);
629 return err;
630}
631
632void l2cap_cleanup_sockets(void)
633{
634 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
635 BT_ERR("L2CAP socket unregistration failed");
636
637 proto_unregister(&l2cap_proto);
638}
Linux kernel - Deliverables
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