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[IPVS]: remove dead code
[deliverable/linux.git] / net / bluetooth / l2cap.c
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1da177e4
LT		 1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth L2CAP core and sockets. */
26
27#include <linux/config.h>
28#include <linux/module.h>
29
30#include <linux/types.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
1da177e4
LT		 33#include <linux/sched.h>
34#include <linux/slab.h>
35#include <linux/poll.h>
36#include <linux/fcntl.h>
37#include <linux/init.h>
38#include <linux/interrupt.h>
39#include <linux/socket.h>
40#include <linux/skbuff.h>
1da177e4 41#include <linux/list.h>
be9d1227 42#include <linux/device.h>
1da177e4
LT		 43#include <net/sock.h>
44
45#include <asm/system.h>
46#include <asm/uaccess.h>
47#include <asm/unaligned.h>
48
49#include <net/bluetooth/bluetooth.h>
50#include <net/bluetooth/hci_core.h>
51#include <net/bluetooth/l2cap.h>
52
53#ifndef CONFIG_BT_L2CAP_DEBUG
54#undef BT_DBG
55#define BT_DBG(D...)
56#endif
57
be9d1227 58#define VERSION "2.8"
1da177e4
LT		 59
60static struct proto_ops l2cap_sock_ops;
61
62static struct bt_sock_list l2cap_sk_list = {
63 .lock = RW_LOCK_UNLOCKED
64};
65
66static int l2cap_conn_del(struct hci_conn *conn, int err);
67
68static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent);
69static void l2cap_chan_del(struct sock *sk, int err);
70
71static void __l2cap_sock_close(struct sock *sk, int reason);
72static void l2cap_sock_close(struct sock *sk);
73static void l2cap_sock_kill(struct sock *sk);
74
75static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
76 u8 code, u8 ident, u16 dlen, void *data);
77
78/* ---- L2CAP timers ---- */
79static void l2cap_sock_timeout(unsigned long arg)
80{
81 struct sock *sk = (struct sock *) arg;
82
83 BT_DBG("sock %p state %d", sk, sk->sk_state);
84
85 bh_lock_sock(sk);
86 __l2cap_sock_close(sk, ETIMEDOUT);
87 bh_unlock_sock(sk);
88
89 l2cap_sock_kill(sk);
90 sock_put(sk);
91}
92
93static void l2cap_sock_set_timer(struct sock *sk, long timeout)
94{
95 BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
96 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
97}
98
99static void l2cap_sock_clear_timer(struct sock *sk)
100{
101 BT_DBG("sock %p state %d", sk, sk->sk_state);
102 sk_stop_timer(sk, &sk->sk_timer);
103}
104
105static void l2cap_sock_init_timer(struct sock *sk)
106{
107 init_timer(&sk->sk_timer);
108 sk->sk_timer.function = l2cap_sock_timeout;
109 sk->sk_timer.data = (unsigned long)sk;
110}
111
112/* ---- L2CAP connections ---- */
113static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
114{
115 struct l2cap_conn *conn;
116
117 if ((conn = hcon->l2cap_data))
118 return conn;
119
120 if (status)
121 return conn;
122
123 if (!(conn = kmalloc(sizeof(struct l2cap_conn), GFP_ATOMIC)))
124 return NULL;
125 memset(conn, 0, sizeof(struct l2cap_conn));
126
127 hcon->l2cap_data = conn;
128 conn->hcon = hcon;
129
130 conn->mtu = hcon->hdev->acl_mtu;
131 conn->src = &hcon->hdev->bdaddr;
132 conn->dst = &hcon->dst;
133
134 spin_lock_init(&conn->lock);
135 rwlock_init(&conn->chan_list.lock);
136
137 BT_DBG("hcon %p conn %p", hcon, conn);
138 return conn;
139}
140
141static int l2cap_conn_del(struct hci_conn *hcon, int err)
142{
143 struct l2cap_conn *conn;
144 struct sock *sk;
145
146 if (!(conn = hcon->l2cap_data))
147 return 0;
148
149 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
150
151 if (conn->rx_skb)
152 kfree_skb(conn->rx_skb);
153
154 /* Kill channels */
155 while ((sk = conn->chan_list.head)) {
156 bh_lock_sock(sk);
157 l2cap_chan_del(sk, err);
158 bh_unlock_sock(sk);
159 l2cap_sock_kill(sk);
160 }
161
162 hcon->l2cap_data = NULL;
163 kfree(conn);
164 return 0;
165}
166
167static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
168{
169 struct l2cap_chan_list *l = &conn->chan_list;
170 write_lock(&l->lock);
171 __l2cap_chan_add(conn, sk, parent);
172 write_unlock(&l->lock);
173}
174
175static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
176{
177 u8 id;
178
179 /* Get next available identificator.
180 * 1 - 128 are used by kernel.
181 * 129 - 199 are reserved.
182 * 200 - 254 are used by utilities like l2ping, etc.
183 */
184
185 spin_lock(&conn->lock);
186
187 if (++conn->tx_ident > 128)
188 conn->tx_ident = 1;
189
190 id = conn->tx_ident;
191
192 spin_unlock(&conn->lock);
193
194 return id;
195}
196
197static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
198{
199 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
200
201 BT_DBG("code 0x%2.2x", code);
202
203 if (!skb)
204 return -ENOMEM;
205
206 return hci_send_acl(conn->hcon, skb, 0);
207}
208
209/* ---- Socket interface ---- */
210static struct sock *__l2cap_get_sock_by_addr(u16 psm, bdaddr_t *src)
211{
212 struct sock *sk;
213 struct hlist_node *node;
214 sk_for_each(sk, node, &l2cap_sk_list.head)
215 if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
216 goto found;
217 sk = NULL;
218found:
219 return sk;
220}
221
222/* Find socket with psm and source bdaddr.
223 * Returns closest match.
224 */
225static struct sock *__l2cap_get_sock_by_psm(int state, u16 psm, bdaddr_t *src)
226{
227 struct sock *sk = NULL, *sk1 = NULL;
228 struct hlist_node *node;
229
230 sk_for_each(sk, node, &l2cap_sk_list.head) {
231 if (state && sk->sk_state != state)
232 continue;
233
234 if (l2cap_pi(sk)->psm == psm) {
235 /* Exact match. */
236 if (!bacmp(&bt_sk(sk)->src, src))
237 break;
238
239 /* Closest match */
240 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
241 sk1 = sk;
242 }
243 }
244 return node ? sk : sk1;
245}
246
247/* Find socket with given address (psm, src).
248 * Returns locked socket */
249static inline struct sock *l2cap_get_sock_by_psm(int state, u16 psm, bdaddr_t *src)
250{
251 struct sock *s;
252 read_lock(&l2cap_sk_list.lock);
253 s = __l2cap_get_sock_by_psm(state, psm, src);
254 if (s) bh_lock_sock(s);
255 read_unlock(&l2cap_sk_list.lock);
256 return s;
257}
258
259static void l2cap_sock_destruct(struct sock *sk)
260{
261 BT_DBG("sk %p", sk);
262
263 skb_queue_purge(&sk->sk_receive_queue);
264 skb_queue_purge(&sk->sk_write_queue);
265}
266
267static void l2cap_sock_cleanup_listen(struct sock *parent)
268{
269 struct sock *sk;
270
271 BT_DBG("parent %p", parent);
272
273 /* Close not yet accepted channels */
274 while ((sk = bt_accept_dequeue(parent, NULL)))
275 l2cap_sock_close(sk);
276
277 parent->sk_state = BT_CLOSED;
278 sock_set_flag(parent, SOCK_ZAPPED);
279}
280
281/* Kill socket (only if zapped and orphan)
282 * Must be called on unlocked socket.
283 */
284static void l2cap_sock_kill(struct sock *sk)
285{
286 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
287 return;
288
289 BT_DBG("sk %p state %d", sk, sk->sk_state);
290
291 /* Kill poor orphan */
292 bt_sock_unlink(&l2cap_sk_list, sk);
293 sock_set_flag(sk, SOCK_DEAD);
294 sock_put(sk);
295}
296
297static void __l2cap_sock_close(struct sock *sk, int reason)
298{
299 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
300
301 switch (sk->sk_state) {
302 case BT_LISTEN:
303 l2cap_sock_cleanup_listen(sk);
304 break;
305
306 case BT_CONNECTED:
307 case BT_CONFIG:
308 case BT_CONNECT2:
309 if (sk->sk_type == SOCK_SEQPACKET) {
310 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
311 struct l2cap_disconn_req req;
312
313 sk->sk_state = BT_DISCONN;
314 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
315
316 req.dcid = __cpu_to_le16(l2cap_pi(sk)->dcid);
317 req.scid = __cpu_to_le16(l2cap_pi(sk)->scid);
318 l2cap_send_cmd(conn, l2cap_get_ident(conn),
319 L2CAP_DISCONN_REQ, sizeof(req), &req);
320 } else {
321 l2cap_chan_del(sk, reason);
322 }
323 break;
324
325 case BT_CONNECT:
326 case BT_DISCONN:
327 l2cap_chan_del(sk, reason);
328 break;
329
330 default:
331 sock_set_flag(sk, SOCK_ZAPPED);
332 break;
333 }
334}
335
336/* Must be called on unlocked socket. */
337static void l2cap_sock_close(struct sock *sk)
338{
339 l2cap_sock_clear_timer(sk);
340 lock_sock(sk);
341 __l2cap_sock_close(sk, ECONNRESET);
342 release_sock(sk);
343 l2cap_sock_kill(sk);
344}
345
346static void l2cap_sock_init(struct sock *sk, struct sock *parent)
347{
348 struct l2cap_pinfo *pi = l2cap_pi(sk);
349
350 BT_DBG("sk %p", sk);
351
352 if (parent) {
353 sk->sk_type = parent->sk_type;
354 pi->imtu = l2cap_pi(parent)->imtu;
355 pi->omtu = l2cap_pi(parent)->omtu;
356 pi->link_mode = l2cap_pi(parent)->link_mode;
357 } else {
358 pi->imtu = L2CAP_DEFAULT_MTU;
359 pi->omtu = 0;
360 pi->link_mode = 0;
361 }
362
363 /* Default config options */
364 pi->conf_mtu = L2CAP_DEFAULT_MTU;
365 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
366}
367
368static struct proto l2cap_proto = {
369 .name = "L2CAP",
370 .owner = THIS_MODULE,
371 .obj_size = sizeof(struct l2cap_pinfo)
372};
373
dd0fc66f 374static struct sock *l2cap_sock_alloc(struct socket *sock, int proto, gfp_t prio)
1da177e4
LT		 375{
376 struct sock *sk;
377
378 sk = sk_alloc(PF_BLUETOOTH, prio, &l2cap_proto, 1);
379 if (!sk)
380 return NULL;
381
382 sock_init_data(sock, sk);
383 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
384
385 sk->sk_destruct = l2cap_sock_destruct;
386 sk->sk_sndtimeo = L2CAP_CONN_TIMEOUT;
387
388 sock_reset_flag(sk, SOCK_ZAPPED);
389
390 sk->sk_protocol = proto;
391 sk->sk_state = BT_OPEN;
392
393 l2cap_sock_init_timer(sk);
394
395 bt_sock_link(&l2cap_sk_list, sk);
396 return sk;
397}
398
399static int l2cap_sock_create(struct socket *sock, int protocol)
400{
401 struct sock *sk;
402
403 BT_DBG("sock %p", sock);
404
405 sock->state = SS_UNCONNECTED;
406
407 if (sock->type != SOCK_SEQPACKET &&
408 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
409 return -ESOCKTNOSUPPORT;
410
411 if (sock->type == SOCK_RAW && !capable(CAP_NET_RAW))
412 return -EPERM;
413
414 sock->ops = &l2cap_sock_ops;
415
416 sk = l2cap_sock_alloc(sock, protocol, GFP_KERNEL);
417 if (!sk)
418 return -ENOMEM;
419
420 l2cap_sock_init(sk, NULL);
421 return 0;
422}
423
424static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
425{
426 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
427 struct sock *sk = sock->sk;
428 int err = 0;
429
430 BT_DBG("sk %p, %s %d", sk, batostr(&la->l2_bdaddr), la->l2_psm);
431
432 if (!addr || addr->sa_family != AF_BLUETOOTH)
433 return -EINVAL;
434
435 lock_sock(sk);
436
437 if (sk->sk_state != BT_OPEN) {
438 err = -EBADFD;
439 goto done;
440 }
441
442 write_lock_bh(&l2cap_sk_list.lock);
443
444 if (la->l2_psm && __l2cap_get_sock_by_addr(la->l2_psm, &la->l2_bdaddr)) {
445 err = -EADDRINUSE;
446 } else {
447 /* Save source address */
448 bacpy(&bt_sk(sk)->src, &la->l2_bdaddr);
449 l2cap_pi(sk)->psm = la->l2_psm;
450 l2cap_pi(sk)->sport = la->l2_psm;
451 sk->sk_state = BT_BOUND;
452 }
453
454 write_unlock_bh(&l2cap_sk_list.lock);
455
456done:
457 release_sock(sk);
458 return err;
459}
460
461static int l2cap_do_connect(struct sock *sk)
462{
463 bdaddr_t *src = &bt_sk(sk)->src;
464 bdaddr_t *dst = &bt_sk(sk)->dst;
465 struct l2cap_conn *conn;
466 struct hci_conn *hcon;
467 struct hci_dev *hdev;
468 int err = 0;
469
470 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), l2cap_pi(sk)->psm);
471
472 if (!(hdev = hci_get_route(dst, src)))
473 return -EHOSTUNREACH;
474
475 hci_dev_lock_bh(hdev);
476
477 err = -ENOMEM;
478
479 hcon = hci_connect(hdev, ACL_LINK, dst);
480 if (!hcon)
481 goto done;
482
483 conn = l2cap_conn_add(hcon, 0);
484 if (!conn) {
485 hci_conn_put(hcon);
486 goto done;
487 }
488
489 err = 0;
490
491 /* Update source addr of the socket */
492 bacpy(src, conn->src);
493
494 l2cap_chan_add(conn, sk, NULL);
495
496 sk->sk_state = BT_CONNECT;
497 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
498
499 if (hcon->state == BT_CONNECTED) {
500 if (sk->sk_type == SOCK_SEQPACKET) {
501 struct l2cap_conn_req req;
502 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
503 req.scid = __cpu_to_le16(l2cap_pi(sk)->scid);
504 req.psm = l2cap_pi(sk)->psm;
505 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
506 L2CAP_CONN_REQ, sizeof(req), &req);
507 } else {
508 l2cap_sock_clear_timer(sk);
509 sk->sk_state = BT_CONNECTED;
510 }
511 }
512
513done:
514 hci_dev_unlock_bh(hdev);
515 hci_dev_put(hdev);
516 return err;
517}
518
519static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
520{
521 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
522 struct sock *sk = sock->sk;
523 int err = 0;
524
525 lock_sock(sk);
526
527 BT_DBG("sk %p", sk);
528
529 if (addr->sa_family != AF_BLUETOOTH || alen < sizeof(struct sockaddr_l2)) {
530 err = -EINVAL;
531 goto done;
532 }
533
534 if (sk->sk_type == SOCK_SEQPACKET && !la->l2_psm) {
535 err = -EINVAL;
536 goto done;
537 }
538
539 switch(sk->sk_state) {
540 case BT_CONNECT:
541 case BT_CONNECT2:
542 case BT_CONFIG:
543 /* Already connecting */
544 goto wait;
545
546 case BT_CONNECTED:
547 /* Already connected */
548 goto done;
549
550 case BT_OPEN:
551 case BT_BOUND:
552 /* Can connect */
553 break;
554
555 default:
556 err = -EBADFD;
557 goto done;
558 }
559
560 /* Set destination address and psm */
561 bacpy(&bt_sk(sk)->dst, &la->l2_bdaddr);
562 l2cap_pi(sk)->psm = la->l2_psm;
563
564 if ((err = l2cap_do_connect(sk)))
565 goto done;
566
567wait:
568 err = bt_sock_wait_state(sk, BT_CONNECTED,
569 sock_sndtimeo(sk, flags & O_NONBLOCK));
570done:
571 release_sock(sk);
572 return err;
573}
574
575static int l2cap_sock_listen(struct socket *sock, int backlog)
576{
577 struct sock *sk = sock->sk;
578 int err = 0;
579
580 BT_DBG("sk %p backlog %d", sk, backlog);
581
582 lock_sock(sk);
583
584 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
585 err = -EBADFD;
586 goto done;
587 }
588
589 if (!l2cap_pi(sk)->psm) {
590 bdaddr_t *src = &bt_sk(sk)->src;
591 u16 psm;
592
593 err = -EINVAL;
594
595 write_lock_bh(&l2cap_sk_list.lock);
596
597 for (psm = 0x1001; psm < 0x1100; psm += 2)
598 if (!__l2cap_get_sock_by_addr(psm, src)) {
599 l2cap_pi(sk)->psm = htobs(psm);
600 l2cap_pi(sk)->sport = htobs(psm);
601 err = 0;
602 break;
603 }
604
605 write_unlock_bh(&l2cap_sk_list.lock);
606
607 if (err < 0)
608 goto done;
609 }
610
611 sk->sk_max_ack_backlog = backlog;
612 sk->sk_ack_backlog = 0;
613 sk->sk_state = BT_LISTEN;
614
615done:
616 release_sock(sk);
617 return err;
618}
619
620static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
621{
622 DECLARE_WAITQUEUE(wait, current);
623 struct sock *sk = sock->sk, *nsk;
624 long timeo;
625 int err = 0;
626
627 lock_sock(sk);
628
629 if (sk->sk_state != BT_LISTEN) {
630 err = -EBADFD;
631 goto done;
632 }
633
634 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
635
636 BT_DBG("sk %p timeo %ld", sk, timeo);
637
638 /* Wait for an incoming connection. (wake-one). */
639 add_wait_queue_exclusive(sk->sk_sleep, &wait);
640 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
641 set_current_state(TASK_INTERRUPTIBLE);
642 if (!timeo) {
643 err = -EAGAIN;
644 break;
645 }
646
647 release_sock(sk);
648 timeo = schedule_timeout(timeo);
649 lock_sock(sk);
650
651 if (sk->sk_state != BT_LISTEN) {
652 err = -EBADFD;
653 break;
654 }
655
656 if (signal_pending(current)) {
657 err = sock_intr_errno(timeo);
658 break;
659 }
660 }
661 set_current_state(TASK_RUNNING);
662 remove_wait_queue(sk->sk_sleep, &wait);
663
664 if (err)
665 goto done;
666
667 newsock->state = SS_CONNECTED;
668
669 BT_DBG("new socket %p", nsk);
670
671done:
672 release_sock(sk);
673 return err;
674}
675
676static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
677{
678 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
679 struct sock *sk = sock->sk;
680
681 BT_DBG("sock %p, sk %p", sock, sk);
682
683 addr->sa_family = AF_BLUETOOTH;
684 *len = sizeof(struct sockaddr_l2);
685
686 if (peer)
687 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
688 else
689 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
690
691 la->l2_psm = l2cap_pi(sk)->psm;
692 return 0;
693}
694
695static inline int l2cap_do_send(struct sock *sk, struct msghdr *msg, int len)
696{
697 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
698 struct sk_buff *skb, **frag;
699 int err, hlen, count, sent=0;
700 struct l2cap_hdr *lh;
701
702 BT_DBG("sk %p len %d", sk, len);
703
704 /* First fragment (with L2CAP header) */
705 if (sk->sk_type == SOCK_DGRAM)
706 hlen = L2CAP_HDR_SIZE + 2;
707 else
708 hlen = L2CAP_HDR_SIZE;
709
710 count = min_t(unsigned int, (conn->mtu - hlen), len);
711
712 skb = bt_skb_send_alloc(sk, hlen + count,
713 msg->msg_flags & MSG_DONTWAIT, &err);
714 if (!skb)
715 return err;
716
717 /* Create L2CAP header */
718 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
719 lh->cid = __cpu_to_le16(l2cap_pi(sk)->dcid);
720 lh->len = __cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
721
722 if (sk->sk_type == SOCK_DGRAM)
723 put_unaligned(l2cap_pi(sk)->psm, (u16 *) skb_put(skb, 2));
724
725 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
726 err = -EFAULT;
727 goto fail;
728 }
729
730 sent += count;
731 len -= count;
732
733 /* Continuation fragments (no L2CAP header) */
734 frag = &skb_shinfo(skb)->frag_list;
735 while (len) {
736 count = min_t(unsigned int, conn->mtu, len);
737
738 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
739 if (!*frag)
740 goto fail;
741
742 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) {
743 err = -EFAULT;
744 goto fail;
745 }
746
747 sent += count;
748 len -= count;
749
750 frag = &(*frag)->next;
751 }
752
753 if ((err = hci_send_acl(conn->hcon, skb, 0)) < 0)
754 goto fail;
755
756 return sent;
757
758fail:
759 kfree_skb(skb);
760 return err;
761}
762
763static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
764{
765 struct sock *sk = sock->sk;
766 int err = 0;
767
768 BT_DBG("sock %p, sk %p", sock, sk);
769
770 if (sk->sk_err)
771 return sock_error(sk);
772
773 if (msg->msg_flags & MSG_OOB)
774 return -EOPNOTSUPP;
775
776 /* Check outgoing MTU */
777 if (sk->sk_type != SOCK_RAW && len > l2cap_pi(sk)->omtu)
778 return -EINVAL;
779
780 lock_sock(sk);
781
782 if (sk->sk_state == BT_CONNECTED)
783 err = l2cap_do_send(sk, msg, len);
784 else
785 err = -ENOTCONN;
786
787 release_sock(sk);
788 return err;
789}
790
791static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, int optlen)
792{
793 struct sock *sk = sock->sk;
794 struct l2cap_options opts;
795 int err = 0, len;
796 u32 opt;
797
798 BT_DBG("sk %p", sk);
799
800 lock_sock(sk);
801
802 switch (optname) {
803 case L2CAP_OPTIONS:
804 len = min_t(unsigned int, sizeof(opts), optlen);
805 if (copy_from_user((char *) &opts, optval, len)) {
806 err = -EFAULT;
807 break;
808 }
809 l2cap_pi(sk)->imtu = opts.imtu;
810 l2cap_pi(sk)->omtu = opts.omtu;
811 break;
812
813 case L2CAP_LM:
814 if (get_user(opt, (u32 __user *) optval)) {
815 err = -EFAULT;
816 break;
817 }
818
819 l2cap_pi(sk)->link_mode = opt;
820 break;
821
822 default:
823 err = -ENOPROTOOPT;
824 break;
825 }
826
827 release_sock(sk);
828 return err;
829}
830
831static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
832{
833 struct sock *sk = sock->sk;
834 struct l2cap_options opts;
835 struct l2cap_conninfo cinfo;
836 int len, err = 0;
837
838 BT_DBG("sk %p", sk);
839
840 if (get_user(len, optlen))
841 return -EFAULT;
842
843 lock_sock(sk);
844
845 switch (optname) {
846 case L2CAP_OPTIONS:
847 opts.imtu = l2cap_pi(sk)->imtu;
848 opts.omtu = l2cap_pi(sk)->omtu;
849 opts.flush_to = l2cap_pi(sk)->flush_to;
850 opts.mode = 0x00;
851
852 len = min_t(unsigned int, len, sizeof(opts));
853 if (copy_to_user(optval, (char *) &opts, len))
854 err = -EFAULT;
855
856 break;
857
858 case L2CAP_LM:
859 if (put_user(l2cap_pi(sk)->link_mode, (u32 __user *) optval))
860 err = -EFAULT;
861 break;
862
863 case L2CAP_CONNINFO:
864 if (sk->sk_state != BT_CONNECTED) {
865 err = -ENOTCONN;
866 break;
867 }
868
869 cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
870 memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
871
872 len = min_t(unsigned int, len, sizeof(cinfo));
873 if (copy_to_user(optval, (char *) &cinfo, len))
874 err = -EFAULT;
875
876 break;
877
878 default:
879 err = -ENOPROTOOPT;
880 break;
881 }
882
883 release_sock(sk);
884 return err;
885}
886
887static int l2cap_sock_shutdown(struct socket *sock, int how)
888{
889 struct sock *sk = sock->sk;
890 int err = 0;
891
892 BT_DBG("sock %p, sk %p", sock, sk);
893
894 if (!sk)
895 return 0;
896
897 lock_sock(sk);
898 if (!sk->sk_shutdown) {
899 sk->sk_shutdown = SHUTDOWN_MASK;
900 l2cap_sock_clear_timer(sk);
901 __l2cap_sock_close(sk, 0);
902
903 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
904 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
905 }
906 release_sock(sk);
907 return err;
908}
909
910static int l2cap_sock_release(struct socket *sock)
911{
912 struct sock *sk = sock->sk;
913 int err;
914
915 BT_DBG("sock %p, sk %p", sock, sk);
916
917 if (!sk)
918 return 0;
919
920 err = l2cap_sock_shutdown(sock, 2);
921
922 sock_orphan(sk);
923 l2cap_sock_kill(sk);
924 return err;
925}
926
927/* ---- L2CAP channels ---- */
928static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
929{
930 struct sock *s;
931 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
932 if (l2cap_pi(s)->dcid == cid)
933 break;
934 }
935 return s;
936}
937
938static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
939{
940 struct sock *s;
941 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
942 if (l2cap_pi(s)->scid == cid)
943 break;
944 }
945 return s;
946}
947
948/* Find channel with given SCID.
949 * Returns locked socket */
950static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
951{
952 struct sock *s;
953 read_lock(&l->lock);
954 s = __l2cap_get_chan_by_scid(l, cid);
955 if (s) bh_lock_sock(s);
956 read_unlock(&l->lock);
957 return s;
958}
959
960static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
961{
962 struct sock *s;
963 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
964 if (l2cap_pi(s)->ident == ident)
965 break;
966 }
967 return s;
968}
969
970static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
971{
972 struct sock *s;
973 read_lock(&l->lock);
974 s = __l2cap_get_chan_by_ident(l, ident);
975 if (s) bh_lock_sock(s);
976 read_unlock(&l->lock);
977 return s;
978}
979
980static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
981{
982 u16 cid = 0x0040;
983
984 for (; cid < 0xffff; cid++) {
985 if(!__l2cap_get_chan_by_scid(l, cid))
986 return cid;
987 }
988
989 return 0;
990}
991
992static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
993{
994 sock_hold(sk);
995
996 if (l->head)
997 l2cap_pi(l->head)->prev_c = sk;
998
999 l2cap_pi(sk)->next_c = l->head;
1000 l2cap_pi(sk)->prev_c = NULL;
1001 l->head = sk;
1002}
1003
1004static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
1005{
1006 struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
1007
1008 write_lock(&l->lock);
1009 if (sk == l->head)
1010 l->head = next;
1011
1012 if (next)
1013 l2cap_pi(next)->prev_c = prev;
1014 if (prev)
1015 l2cap_pi(prev)->next_c = next;
1016 write_unlock(&l->lock);
1017
1018 __sock_put(sk);
1019}
1020
1021static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
1022{
1023 struct l2cap_chan_list *l = &conn->chan_list;
1024
1025 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
1026
1027 l2cap_pi(sk)->conn = conn;
1028
1029 if (sk->sk_type == SOCK_SEQPACKET) {
1030 /* Alloc CID for connection-oriented socket */
1031 l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
1032 } else if (sk->sk_type == SOCK_DGRAM) {
1033 /* Connectionless socket */
1034 l2cap_pi(sk)->scid = 0x0002;
1035 l2cap_pi(sk)->dcid = 0x0002;
1036 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
1037 } else {
1038 /* Raw socket can send/recv signalling messages only */
1039 l2cap_pi(sk)->scid = 0x0001;
1040 l2cap_pi(sk)->dcid = 0x0001;
1041 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
1042 }
1043
1044 __l2cap_chan_link(l, sk);
1045
1046 if (parent)
1047 bt_accept_enqueue(parent, sk);
1048}
1049
1050/* Delete channel.
1051 * Must be called on the locked socket. */
1052static void l2cap_chan_del(struct sock *sk, int err)
1053{
1054 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1055 struct sock *parent = bt_sk(sk)->parent;
1056
1057 l2cap_sock_clear_timer(sk);
1058
1059 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
1060
1061 if (conn) {
1062 /* Unlink from channel list */
1063 l2cap_chan_unlink(&conn->chan_list, sk);
1064 l2cap_pi(sk)->conn = NULL;
1065 hci_conn_put(conn->hcon);
1066 }
1067
1068 sk->sk_state = BT_CLOSED;
1069 sock_set_flag(sk, SOCK_ZAPPED);
1070
1071 if (err)
1072 sk->sk_err = err;
1073
1074 if (parent) {
1075 bt_accept_unlink(sk);
1076 parent->sk_data_ready(parent, 0);
1077 } else
1078 sk->sk_state_change(sk);
1079}
1080
1081static void l2cap_conn_ready(struct l2cap_conn *conn)
1082{
1083 struct l2cap_chan_list *l = &conn->chan_list;
1084 struct sock *sk;
1085
1086 BT_DBG("conn %p", conn);
1087
1088 read_lock(&l->lock);
1089
1090 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
1091 bh_lock_sock(sk);
1092
1093 if (sk->sk_type != SOCK_SEQPACKET) {
1094 l2cap_sock_clear_timer(sk);
1095 sk->sk_state = BT_CONNECTED;
1096 sk->sk_state_change(sk);
1097 } else if (sk->sk_state == BT_CONNECT) {
1098 struct l2cap_conn_req req;
1099 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
1100 req.scid = __cpu_to_le16(l2cap_pi(sk)->scid);
1101 req.psm = l2cap_pi(sk)->psm;
1102 l2cap_send_cmd(conn, l2cap_pi(sk)->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1103 }
1104
1105 bh_unlock_sock(sk);
1106 }
1107
1108 read_unlock(&l->lock);
1109}
1110
1111/* Notify sockets that we cannot guaranty reliability anymore */
1112static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1113{
1114 struct l2cap_chan_list *l = &conn->chan_list;
1115 struct sock *sk;
1116
1117 BT_DBG("conn %p", conn);
1118
1119 read_lock(&l->lock);
1120 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
1121 if (l2cap_pi(sk)->link_mode & L2CAP_LM_RELIABLE)
1122 sk->sk_err = err;
1123 }
1124 read_unlock(&l->lock);
1125}
1126
1127static void l2cap_chan_ready(struct sock *sk)
1128{
1129 struct sock *parent = bt_sk(sk)->parent;
1130
1131 BT_DBG("sk %p, parent %p", sk, parent);
1132
1133 l2cap_pi(sk)->conf_state = 0;
1134 l2cap_sock_clear_timer(sk);
1135
1136 if (!parent) {
1137 /* Outgoing channel.
1138 * Wake up socket sleeping on connect.
1139 */
1140 sk->sk_state = BT_CONNECTED;
1141 sk->sk_state_change(sk);
1142 } else {
1143 /* Incoming channel.
1144 * Wake up socket sleeping on accept.
1145 */
1146 parent->sk_data_ready(parent, 0);
1147 }
1148}
1149
1150/* Copy frame to all raw sockets on that connection */
1151static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
1152{
1153 struct l2cap_chan_list *l = &conn->chan_list;
1154 struct sk_buff *nskb;
1155 struct sock * sk;
1156
1157 BT_DBG("conn %p", conn);
1158
1159 read_lock(&l->lock);
1160 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
1161 if (sk->sk_type != SOCK_RAW)
1162 continue;
1163
1164 /* Don't send frame to the socket it came from */
1165 if (skb->sk == sk)
1166 continue;
1167
1168 if (!(nskb = skb_clone(skb, GFP_ATOMIC)))
1169 continue;
1170
1171 if (sock_queue_rcv_skb(sk, nskb))
1172 kfree_skb(nskb);
1173 }
1174 read_unlock(&l->lock);
1175}
1176
1177/* ---- L2CAP signalling commands ---- */
1178static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
1179 u8 code, u8 ident, u16 dlen, void *data)
1180{
1181 struct sk_buff *skb, **frag;
1182 struct l2cap_cmd_hdr *cmd;
1183 struct l2cap_hdr *lh;
1184 int len, count;
1185
1186 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", conn, code, ident, dlen);
1187
1188 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
1189 count = min_t(unsigned int, conn->mtu, len);
1190
1191 skb = bt_skb_alloc(count, GFP_ATOMIC);
1192 if (!skb)
1193 return NULL;
1194
1195 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1196 lh->len = __cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
1197 lh->cid = __cpu_to_le16(0x0001);
1198
1199 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
1200 cmd->code = code;
1201 cmd->ident = ident;
1202 cmd->len = __cpu_to_le16(dlen);
1203
1204 if (dlen) {
1205 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
1206 memcpy(skb_put(skb, count), data, count);
1207 data += count;
1208 }
1209
1210 len -= skb->len;
1211
1212 /* Continuation fragments (no L2CAP header) */
1213 frag = &skb_shinfo(skb)->frag_list;
1214 while (len) {
1215 count = min_t(unsigned int, conn->mtu, len);
1216
1217 *frag = bt_skb_alloc(count, GFP_ATOMIC);
1218 if (!*frag)
1219 goto fail;
1220
1221 memcpy(skb_put(*frag, count), data, count);
1222
1223 len -= count;
1224 data += count;
1225
1226 frag = &(*frag)->next;
1227 }
1228
1229 return skb;
1230
1231fail:
1232 kfree_skb(skb);
1233 return NULL;
1234}
1235
1236static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
1237{
1238 struct l2cap_conf_opt *opt = *ptr;
1239 int len;
1240
1241 len = L2CAP_CONF_OPT_SIZE + opt->len;
1242 *ptr += len;
1243
1244 *type = opt->type;
1245 *olen = opt->len;
1246
1247 switch (opt->len) {
1248 case 1:
1249 *val = *((u8 *) opt->val);
1250 break;
1251
1252 case 2:
1253 *val = __le16_to_cpu(*((u16 *)opt->val));
1254 break;
1255
1256 case 4:
1257 *val = __le32_to_cpu(*((u32 *)opt->val));
1258 break;
1259
1260 default:
1261 *val = (unsigned long) opt->val;
1262 break;
1263 }
1264
1265 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
1266 return len;
1267}
1268
1269static inline void l2cap_parse_conf_req(struct sock *sk, void *data, int len)
1270{
1271 int type, hint, olen;
1272 unsigned long val;
1273 void *ptr = data;
1274
1275 BT_DBG("sk %p len %d", sk, len);
1276
1277 while (len >= L2CAP_CONF_OPT_SIZE) {
1278 len -= l2cap_get_conf_opt(&ptr, &type, &olen, &val);
1279
1280 hint = type & 0x80;
1281 type &= 0x7f;
1282
1283 switch (type) {
1284 case L2CAP_CONF_MTU:
1285 l2cap_pi(sk)->conf_mtu = val;
1286 break;
1287
1288 case L2CAP_CONF_FLUSH_TO:
1289 l2cap_pi(sk)->flush_to = val;
1290 break;
1291
1292 case L2CAP_CONF_QOS:
1293 break;
1294
1295 default:
1296 if (hint)
1297 break;
1298
1299 /* FIXME: Reject unknown option */
1300 break;
1301 }
1302 }
1303}
1304
1305static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
1306{
1307 struct l2cap_conf_opt *opt = *ptr;
1308
1309 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
1310
1311 opt->type = type;
1312 opt->len = len;
1313
1314 switch (len) {
1315 case 1:
1316 *((u8 *) opt->val) = val;
1317 break;
1318
1319 case 2:
1320 *((u16 *) opt->val) = __cpu_to_le16(val);
1321 break;
1322
1323 case 4:
1324 *((u32 *) opt->val) = __cpu_to_le32(val);
1325 break;
1326
1327 default:
1328 memcpy(opt->val, (void *) val, len);
1329 break;
1330 }
1331
1332 *ptr += L2CAP_CONF_OPT_SIZE + len;
1333}
1334
1335static int l2cap_build_conf_req(struct sock *sk, void *data)
1336{
1337 struct l2cap_pinfo *pi = l2cap_pi(sk);
1338 struct l2cap_conf_req *req = data;
1339 void *ptr = req->data;
1340
1341 BT_DBG("sk %p", sk);
1342
1343 if (pi->imtu != L2CAP_DEFAULT_MTU)
1344 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
1345
1346 /* FIXME: Need actual value of the flush timeout */
1347 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
1348 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
1349
1350 req->dcid = __cpu_to_le16(pi->dcid);
1351 req->flags = __cpu_to_le16(0);
1352
1353 return ptr - data;
1354}
1355
1356static inline int l2cap_conf_output(struct sock *sk, void **ptr)
1357{
1358 struct l2cap_pinfo *pi = l2cap_pi(sk);
1359 int result = 0;
1360
1361 /* Configure output options and let the other side know
1362 * which ones we don't like. */
1363 if (pi->conf_mtu < pi->omtu) {
1364 l2cap_add_conf_opt(ptr, L2CAP_CONF_MTU, 2, pi->omtu);
1365 result = L2CAP_CONF_UNACCEPT;
1366 } else {
1367 pi->omtu = pi->conf_mtu;
1368 }
1369
1370 BT_DBG("sk %p result %d", sk, result);
1371 return result;
1372}
1373
1374static int l2cap_build_conf_rsp(struct sock *sk, void *data, int *result)
1375{
1376 struct l2cap_conf_rsp *rsp = data;
1377 void *ptr = rsp->data;
1378 u16 flags = 0;
1379
1380 BT_DBG("sk %p complete %d", sk, result ? 1 : 0);
1381
1382 if (result)
1383 *result = l2cap_conf_output(sk, &ptr);
1384 else
1385 flags = 0x0001;
1386
1387 rsp->scid = __cpu_to_le16(l2cap_pi(sk)->dcid);
1388 rsp->result = __cpu_to_le16(result ? *result : 0);
1389 rsp->flags = __cpu_to_le16(flags);
1390
1391 return ptr - data;
1392}
1393
1394static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1395{
1396 struct l2cap_chan_list *list = &conn->chan_list;
1397 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
1398 struct l2cap_conn_rsp rsp;
1399 struct sock *sk, *parent;
1400 int result = 0, status = 0;
1401
1402 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
1403 u16 psm = req->psm;
1404
1405 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
1406
1407 /* Check if we have socket listening on psm */
1408 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
1409 if (!parent) {
1410 result = L2CAP_CR_BAD_PSM;
1411 goto sendresp;
1412 }
1413
1414 result = L2CAP_CR_NO_MEM;
1415
1416 /* Check for backlog size */
1417 if (sk_acceptq_is_full(parent)) {
1418 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1419 goto response;
1420 }
1421
1422 sk = l2cap_sock_alloc(NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1423 if (!sk)
1424 goto response;
1425
1426 write_lock(&list->lock);
1427
1428 /* Check if we already have channel with that dcid */
1429 if (__l2cap_get_chan_by_dcid(list, scid)) {
1430 write_unlock(&list->lock);
1431 sock_set_flag(sk, SOCK_ZAPPED);
1432 l2cap_sock_kill(sk);
1433 goto response;
1434 }
1435
1436 hci_conn_hold(conn->hcon);
1437
1438 l2cap_sock_init(sk, parent);
1439 bacpy(&bt_sk(sk)->src, conn->src);
1440 bacpy(&bt_sk(sk)->dst, conn->dst);
1441 l2cap_pi(sk)->psm = psm;
1442 l2cap_pi(sk)->dcid = scid;
1443
1444 __l2cap_chan_add(conn, sk, parent);
1445 dcid = l2cap_pi(sk)->scid;
1446
1447 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
1448
1449 /* Service level security */
1450 result = L2CAP_CR_PEND;
1451 status = L2CAP_CS_AUTHEN_PEND;
1452 sk->sk_state = BT_CONNECT2;
1453 l2cap_pi(sk)->ident = cmd->ident;
1454
1455 if ((l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) ||
1456 (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)) {
1457 if (!hci_conn_encrypt(conn->hcon))
1458 goto done;
1459 } else if (l2cap_pi(sk)->link_mode & L2CAP_LM_AUTH) {
1460 if (!hci_conn_auth(conn->hcon))
1461 goto done;
1462 }
1463
1464 sk->sk_state = BT_CONFIG;
1465 result = status = 0;
1466
1467done:
1468 write_unlock(&list->lock);
1469
1470response:
1471 bh_unlock_sock(parent);
1472
1473sendresp:
1474 rsp.scid = __cpu_to_le16(scid);
1475 rsp.dcid = __cpu_to_le16(dcid);
1476 rsp.result = __cpu_to_le16(result);
1477 rsp.status = __cpu_to_le16(status);
1478 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1479 return 0;
1480}
1481
1482static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1483{
1484 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
1485 u16 scid, dcid, result, status;
1486 struct sock *sk;
1487 u8 req[128];
1488
1489 scid = __le16_to_cpu(rsp->scid);
1490 dcid = __le16_to_cpu(rsp->dcid);
1491 result = __le16_to_cpu(rsp->result);
1492 status = __le16_to_cpu(rsp->status);
1493
1494 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
1495
1496 if (scid) {
1497 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1498 return 0;
1499 } else {
1500 if (!(sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident)))
1501 return 0;
1502 }
1503
1504 switch (result) {
1505 case L2CAP_CR_SUCCESS:
1506 sk->sk_state = BT_CONFIG;
1507 l2cap_pi(sk)->ident = 0;
1508 l2cap_pi(sk)->dcid = dcid;
1509 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
1510
1511 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1512 l2cap_build_conf_req(sk, req), req);
1513 break;
1514
1515 case L2CAP_CR_PEND:
1516 break;
1517
1518 default:
1519 l2cap_chan_del(sk, ECONNREFUSED);
1520 break;
1521 }
1522
1523 bh_unlock_sock(sk);
1524 return 0;
1525}
1526
1527static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1528{
1529 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
1530 u16 dcid, flags;
1531 u8 rsp[64];
1532 struct sock *sk;
1533 int result;
1534
1535 dcid = __le16_to_cpu(req->dcid);
1536 flags = __le16_to_cpu(req->flags);
1537
1538 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
1539
1540 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid)))
1541 return -ENOENT;
1542
1543 l2cap_parse_conf_req(sk, req->data, cmd->len - sizeof(*req));
1544
1545 if (flags & 0x0001) {
1546 /* Incomplete config. Send empty response. */
1547 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
1548 l2cap_build_conf_rsp(sk, rsp, NULL), rsp);
1549 goto unlock;
1550 }
1551
1552 /* Complete config. */
1553 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
1554 l2cap_build_conf_rsp(sk, rsp, &result), rsp);
1555
1556 if (result)
1557 goto unlock;
1558
1559 /* Output config done */
1560 l2cap_pi(sk)->conf_state |= L2CAP_CONF_OUTPUT_DONE;
1561
1562 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
1563 sk->sk_state = BT_CONNECTED;
1564 l2cap_chan_ready(sk);
1565 } else if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
1566 u8 req[64];
1567 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1568 l2cap_build_conf_req(sk, req), req);
1569 }
1570
1571unlock:
1572 bh_unlock_sock(sk);
1573 return 0;
1574}
1575
1576static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1577{
1578 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
1579 u16 scid, flags, result;
1580 struct sock *sk;
1581
1582 scid = __le16_to_cpu(rsp->scid);
1583 flags = __le16_to_cpu(rsp->flags);
1584 result = __le16_to_cpu(rsp->result);
1585
1586 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", scid, flags, result);
1587
1588 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1589 return 0;
1590
1591 switch (result) {
1592 case L2CAP_CONF_SUCCESS:
1593 break;
1594
1595 case L2CAP_CONF_UNACCEPT:
1596 if (++l2cap_pi(sk)->conf_retry < L2CAP_CONF_MAX_RETRIES) {
1597 char req[128];
1598 /* It does not make sense to adjust L2CAP parameters
1599 * that are currently defined in the spec. We simply
1600 * resend config request that we sent earlier. It is
1601 * stupid, but it helps qualification testing which
1602 * expects at least some response from us. */
1603 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1604 l2cap_build_conf_req(sk, req), req);
1605 goto done;
1606 }
1607
1608 default:
1609 sk->sk_state = BT_DISCONN;
1610 sk->sk_err = ECONNRESET;
1611 l2cap_sock_set_timer(sk, HZ * 5);
1612 {
1613 struct l2cap_disconn_req req;
1614 req.dcid = __cpu_to_le16(l2cap_pi(sk)->dcid);
1615 req.scid = __cpu_to_le16(l2cap_pi(sk)->scid);
1616 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1617 L2CAP_DISCONN_REQ, sizeof(req), &req);
1618 }
1619 goto done;
1620 }
1621
1622 if (flags & 0x01)
1623 goto done;
1624
1625 /* Input config done */
1626 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
1627
1628 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
1629 sk->sk_state = BT_CONNECTED;
1630 l2cap_chan_ready(sk);
1631 }
1632
1633done:
1634 bh_unlock_sock(sk);
1635 return 0;
1636}
1637
1638static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1639{
1640 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
1641 struct l2cap_disconn_rsp rsp;
1642 u16 dcid, scid;
1643 struct sock *sk;
1644
1645 scid = __le16_to_cpu(req->scid);
1646 dcid = __le16_to_cpu(req->dcid);
1647
1648 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
1649
1650 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid)))
1651 return 0;
1652
1653 rsp.dcid = __cpu_to_le16(l2cap_pi(sk)->scid);
1654 rsp.scid = __cpu_to_le16(l2cap_pi(sk)->dcid);
1655 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
1656
1657 sk->sk_shutdown = SHUTDOWN_MASK;
1658
1659 l2cap_chan_del(sk, ECONNRESET);
1660 bh_unlock_sock(sk);
1661
1662 l2cap_sock_kill(sk);
1663 return 0;
1664}
1665
1666static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1667{
1668 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
1669 u16 dcid, scid;
1670 struct sock *sk;
1671
1672 scid = __le16_to_cpu(rsp->scid);
1673 dcid = __le16_to_cpu(rsp->dcid);
1674
1675 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
1676
1677 if (!(sk = l2cap_get_chan_by_scid(&conn->chan_list, scid)))
1678 return 0;
1679
1680 l2cap_chan_del(sk, 0);
1681 bh_unlock_sock(sk);
1682
1683 l2cap_sock_kill(sk);
1684 return 0;
1685}
1686
1687static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1688{
1689 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1690 struct l2cap_info_rsp rsp;
1691 u16 type;
1692
1693 type = __le16_to_cpu(req->type);
1694
1695 BT_DBG("type 0x%4.4x", type);
1696
1697 rsp.type = __cpu_to_le16(type);
1698 rsp.result = __cpu_to_le16(L2CAP_IR_NOTSUPP);
1699 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp), &rsp);
1700
1701 return 0;
1702}
1703
1704static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
1705{
1706 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
1707 u16 type, result;
1708
1709 type = __le16_to_cpu(rsp->type);
1710 result = __le16_to_cpu(rsp->result);
1711
1712 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
1713
1714 return 0;
1715}
1716
1717static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
1718{
1719 u8 *data = skb->data;
1720 int len = skb->len;
1721 struct l2cap_cmd_hdr cmd;
1722 int err = 0;
1723
1724 l2cap_raw_recv(conn, skb);
1725
1726 while (len >= L2CAP_CMD_HDR_SIZE) {
1727 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
1728 data += L2CAP_CMD_HDR_SIZE;
1729 len -= L2CAP_CMD_HDR_SIZE;
1730
1731 cmd.len = __le16_to_cpu(cmd.len);
1732
1733 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd.len, cmd.ident);
1734
1735 if (cmd.len > len || !cmd.ident) {
1736 BT_DBG("corrupted command");
1737 break;
1738 }
1739
1740 switch (cmd.code) {
1741 case L2CAP_COMMAND_REJ:
1742 /* FIXME: We should process this */
1743 break;
1744
1745 case L2CAP_CONN_REQ:
1746 err = l2cap_connect_req(conn, &cmd, data);
1747 break;
1748
1749 case L2CAP_CONN_RSP:
1750 err = l2cap_connect_rsp(conn, &cmd, data);
1751 break;
1752
1753 case L2CAP_CONF_REQ:
1754 err = l2cap_config_req(conn, &cmd, data);
1755 break;
1756
1757 case L2CAP_CONF_RSP:
1758 err = l2cap_config_rsp(conn, &cmd, data);
1759 break;
1760
1761 case L2CAP_DISCONN_REQ:
1762 err = l2cap_disconnect_req(conn, &cmd, data);
1763 break;
1764
1765 case L2CAP_DISCONN_RSP:
1766 err = l2cap_disconnect_rsp(conn, &cmd, data);
1767 break;
1768
1769 case L2CAP_ECHO_REQ:
1770 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd.len, data);
1771 break;
1772
1773 case L2CAP_ECHO_RSP:
1774 break;
1775
1776 case L2CAP_INFO_REQ:
1777 err = l2cap_information_req(conn, &cmd, data);
1778 break;
1779
1780 case L2CAP_INFO_RSP:
1781 err = l2cap_information_rsp(conn, &cmd, data);
1782 break;
1783
1784 default:
1785 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
1786 err = -EINVAL;
1787 break;
1788 }
1789
1790 if (err) {
1791 struct l2cap_cmd_rej rej;
1792 BT_DBG("error %d", err);
1793
1794 /* FIXME: Map err to a valid reason */
1795 rej.reason = __cpu_to_le16(0);
1796 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
1797 }
1798
1799 data += cmd.len;
1800 len -= cmd.len;
1801 }
1802
1803 kfree_skb(skb);
1804}
1805
1806static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
1807{
1808 struct sock *sk;
1809
1810 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
1811 if (!sk) {
1812 BT_DBG("unknown cid 0x%4.4x", cid);
1813 goto drop;
1814 }
1815
1816 BT_DBG("sk %p, len %d", sk, skb->len);
1817
1818 if (sk->sk_state != BT_CONNECTED)
1819 goto drop;
1820
1821 if (l2cap_pi(sk)->imtu < skb->len)
1822 goto drop;
1823
1824 /* If socket recv buffers overflows we drop data here
1825 * which is *bad* because L2CAP has to be reliable.
1826 * But we don't have any other choice. L2CAP doesn't
1827 * provide flow control mechanism. */
1828
1829 if (!sock_queue_rcv_skb(sk, skb))
1830 goto done;
1831
1832drop:
1833 kfree_skb(skb);
1834
1835done:
1836 if (sk) bh_unlock_sock(sk);
1837 return 0;
1838}
1839
1840static inline int l2cap_conless_channel(struct l2cap_conn *conn, u16 psm, struct sk_buff *skb)
1841{
1842 struct sock *sk;
1843
1844 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
1845 if (!sk)
1846 goto drop;
1847
1848 BT_DBG("sk %p, len %d", sk, skb->len);
1849
1850 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
1851 goto drop;
1852
1853 if (l2cap_pi(sk)->imtu < skb->len)
1854 goto drop;
1855
1856 if (!sock_queue_rcv_skb(sk, skb))
1857 goto done;
1858
1859drop:
1860 kfree_skb(skb);
1861
1862done:
1863 if (sk) bh_unlock_sock(sk);
1864 return 0;
1865}
1866
1867static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
1868{
1869 struct l2cap_hdr *lh = (void *) skb->data;
1870 u16 cid, psm, len;
1871
1872 skb_pull(skb, L2CAP_HDR_SIZE);
1873 cid = __le16_to_cpu(lh->cid);
1874 len = __le16_to_cpu(lh->len);
1875
1876 BT_DBG("len %d, cid 0x%4.4x", len, cid);
1877
1878 switch (cid) {
1879 case 0x0001:
1880 l2cap_sig_channel(conn, skb);
1881 break;
1882
1883 case 0x0002:
1884 psm = get_unaligned((u16 *) skb->data);
1885 skb_pull(skb, 2);
1886 l2cap_conless_channel(conn, psm, skb);
1887 break;
1888
1889 default:
1890 l2cap_data_channel(conn, cid, skb);
1891 break;
1892 }
1893}
1894
1895/* ---- L2CAP interface with lower layer (HCI) ---- */
1896
1897static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
1898{
1899 int exact = 0, lm1 = 0, lm2 = 0;
1900 register struct sock *sk;
1901 struct hlist_node *node;
1902
1903 if (type != ACL_LINK)
1904 return 0;
1905
1906 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
1907
1908 /* Find listening sockets and check their link_mode */
1909 read_lock(&l2cap_sk_list.lock);
1910 sk_for_each(sk, node, &l2cap_sk_list.head) {
1911 if (sk->sk_state != BT_LISTEN)
1912 continue;
1913
1914 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
1915 lm1 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode);
1916 exact++;
1917 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
1918 lm2 |= (HCI_LM_ACCEPT | l2cap_pi(sk)->link_mode);
1919 }
1920 read_unlock(&l2cap_sk_list.lock);
1921
1922 return exact ? lm1 : lm2;
1923}
1924
1925static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1926{
1927 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
1928
1929 if (hcon->type != ACL_LINK)
1930 return 0;
1931
1932 if (!status) {
1933 struct l2cap_conn *conn;
1934
1935 conn = l2cap_conn_add(hcon, status);
1936 if (conn)
1937 l2cap_conn_ready(conn);
1938 } else
1939 l2cap_conn_del(hcon, bt_err(status));
1940
1941 return 0;
1942}
1943
1944static int l2cap_disconn_ind(struct hci_conn *hcon, u8 reason)
1945{
1946 BT_DBG("hcon %p reason %d", hcon, reason);
1947
1948 if (hcon->type != ACL_LINK)
1949 return 0;
1950
1951 l2cap_conn_del(hcon, bt_err(reason));
1952 return 0;
1953}
1954
1955static int l2cap_auth_cfm(struct hci_conn *hcon, u8 status)
1956{
1957 struct l2cap_chan_list *l;
1958 struct l2cap_conn *conn;
1959 struct l2cap_conn_rsp rsp;
1960 struct sock *sk;
1961 int result;
1962
1963 if (!(conn = hcon->l2cap_data))
1964 return 0;
1965 l = &conn->chan_list;
1966
1967 BT_DBG("conn %p", conn);
1968
1969 read_lock(&l->lock);
1970
1971 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
1972 bh_lock_sock(sk);
1973
1974 if (sk->sk_state != BT_CONNECT2 ||
1975 (l2cap_pi(sk)->link_mode & L2CAP_LM_ENCRYPT) ||
1976 (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)) {
1977 bh_unlock_sock(sk);
1978 continue;
1979 }
1980
1981 if (!status) {
1982 sk->sk_state = BT_CONFIG;
1983 result = 0;
1984 } else {
1985 sk->sk_state = BT_DISCONN;
1986 l2cap_sock_set_timer(sk, HZ/10);
1987 result = L2CAP_CR_SEC_BLOCK;
1988 }
1989
1990 rsp.scid = __cpu_to_le16(l2cap_pi(sk)->dcid);
1991 rsp.dcid = __cpu_to_le16(l2cap_pi(sk)->scid);
1992 rsp.result = __cpu_to_le16(result);
1993 rsp.status = __cpu_to_le16(0);
1994 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
1995 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1996
1997 bh_unlock_sock(sk);
1998 }
1999
2000 read_unlock(&l->lock);
2001 return 0;
2002}
2003
2004static int l2cap_encrypt_cfm(struct hci_conn *hcon, u8 status)
2005{
2006 struct l2cap_chan_list *l;
2007 struct l2cap_conn *conn;
2008 struct l2cap_conn_rsp rsp;
2009 struct sock *sk;
2010 int result;
2011
2012 if (!(conn = hcon->l2cap_data))
2013 return 0;
2014 l = &conn->chan_list;
2015
2016 BT_DBG("conn %p", conn);
2017
2018 read_lock(&l->lock);
2019
2020 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2021 bh_lock_sock(sk);
2022
2023 if (sk->sk_state != BT_CONNECT2) {
2024 bh_unlock_sock(sk);
2025 continue;
2026 }
2027
2028 if (!status) {
2029 sk->sk_state = BT_CONFIG;
2030 result = 0;
2031 } else {
2032 sk->sk_state = BT_DISCONN;
2033 l2cap_sock_set_timer(sk, HZ/10);
2034 result = L2CAP_CR_SEC_BLOCK;
2035 }
2036
2037 rsp.scid = __cpu_to_le16(l2cap_pi(sk)->dcid);
2038 rsp.dcid = __cpu_to_le16(l2cap_pi(sk)->scid);
2039 rsp.result = __cpu_to_le16(result);
2040 rsp.status = __cpu_to_le16(0);
2041 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
2042 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2043
2044 if (l2cap_pi(sk)->link_mode & L2CAP_LM_SECURE)
2045 hci_conn_change_link_key(hcon);
2046
2047 bh_unlock_sock(sk);
2048 }
2049
2050 read_unlock(&l->lock);
2051 return 0;
2052}
2053
2054static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
2055{
2056 struct l2cap_conn *conn = hcon->l2cap_data;
2057
2058 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
2059 goto drop;
2060
2061 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
2062
2063 if (flags & ACL_START) {
2064 struct l2cap_hdr *hdr;
2065 int len;
2066
2067 if (conn->rx_len) {
2068 BT_ERR("Unexpected start frame (len %d)", skb->len);
2069 kfree_skb(conn->rx_skb);
2070 conn->rx_skb = NULL;
2071 conn->rx_len = 0;
2072 l2cap_conn_unreliable(conn, ECOMM);
2073 }
2074
2075 if (skb->len < 2) {
2076 BT_ERR("Frame is too short (len %d)", skb->len);
2077 l2cap_conn_unreliable(conn, ECOMM);
2078 goto drop;
2079 }
2080
2081 hdr = (struct l2cap_hdr *) skb->data;
2082 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
2083
2084 if (len == skb->len) {
2085 /* Complete frame received */
2086 l2cap_recv_frame(conn, skb);
2087 return 0;
2088 }
2089
2090 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
2091
2092 if (skb->len > len) {
2093 BT_ERR("Frame is too long (len %d, expected len %d)",
2094 skb->len, len);
2095 l2cap_conn_unreliable(conn, ECOMM);
2096 goto drop;
2097 }
2098
2099 /* Allocate skb for the complete frame (with header) */
2100 if (!(conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC)))
2101 goto drop;
2102
2103 memcpy(skb_put(conn->rx_skb, skb->len), skb->data, skb->len);
2104 conn->rx_len = len - skb->len;
2105 } else {
2106 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
2107
2108 if (!conn->rx_len) {
2109 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
2110 l2cap_conn_unreliable(conn, ECOMM);
2111 goto drop;
2112 }
2113
2114 if (skb->len > conn->rx_len) {
2115 BT_ERR("Fragment is too long (len %d, expected %d)",
2116 skb->len, conn->rx_len);
2117 kfree_skb(conn->rx_skb);
2118 conn->rx_skb = NULL;
2119 conn->rx_len = 0;
2120 l2cap_conn_unreliable(conn, ECOMM);
2121 goto drop;
2122 }
2123
2124 memcpy(skb_put(conn->rx_skb, skb->len), skb->data, skb->len);
2125 conn->rx_len -= skb->len;
2126
2127 if (!conn->rx_len) {
2128 /* Complete frame received */
2129 l2cap_recv_frame(conn, conn->rx_skb);
2130 conn->rx_skb = NULL;
2131 }
2132 }
2133
2134drop:
2135 kfree_skb(skb);
2136 return 0;
2137}
2138
be9d1227 2139static ssize_t l2cap_sysfs_show(struct class *dev, char *buf)
1da177e4
LT		 2140{
2141 struct sock *sk;
2142 struct hlist_node *node;
be9d1227 2143 char *str = buf;
1da177e4
LT		 2144
2145 read_lock_bh(&l2cap_sk_list.lock);
2146
be9d1227
MH		 2147 sk_for_each(sk, node, &l2cap_sk_list.head) {
2148 struct l2cap_pinfo *pi = l2cap_pi(sk);
1da177e4 2149
be9d1227
MH		 2150 str += sprintf(str, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d 0x%x\n",
2151 batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
2152 sk->sk_state, pi->psm, pi->scid, pi->dcid, pi->imtu,
2153 pi->omtu, pi->link_mode);
2154 }
1da177e4 2155
1da177e4 2156 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 2157
be9d1227 2158 return (str - buf);
1da177e4
LT		 2159}
2160
be9d1227 2161static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL);
1da177e4
LT		 2162
2163static struct proto_ops l2cap_sock_ops = {
2164 .family = PF_BLUETOOTH,
2165 .owner = THIS_MODULE,
2166 .release = l2cap_sock_release,
2167 .bind = l2cap_sock_bind,
2168 .connect = l2cap_sock_connect,
2169 .listen = l2cap_sock_listen,
2170 .accept = l2cap_sock_accept,
2171 .getname = l2cap_sock_getname,
2172 .sendmsg = l2cap_sock_sendmsg,
2173 .recvmsg = bt_sock_recvmsg,
2174 .poll = bt_sock_poll,
2175 .mmap = sock_no_mmap,
2176 .socketpair = sock_no_socketpair,
2177 .ioctl = sock_no_ioctl,
2178 .shutdown = l2cap_sock_shutdown,
2179 .setsockopt = l2cap_sock_setsockopt,
2180 .getsockopt = l2cap_sock_getsockopt
2181};
2182
2183static struct net_proto_family l2cap_sock_family_ops = {
2184 .family = PF_BLUETOOTH,
2185 .owner = THIS_MODULE,
2186 .create = l2cap_sock_create,
2187};
2188
2189static struct hci_proto l2cap_hci_proto = {
2190 .name = "L2CAP",
2191 .id = HCI_PROTO_L2CAP,
2192 .connect_ind = l2cap_connect_ind,
2193 .connect_cfm = l2cap_connect_cfm,
2194 .disconn_ind = l2cap_disconn_ind,
2195 .auth_cfm = l2cap_auth_cfm,
2196 .encrypt_cfm = l2cap_encrypt_cfm,
2197 .recv_acldata = l2cap_recv_acldata
2198};
2199
2200static int __init l2cap_init(void)
2201{
2202 int err;
be9d1227 2203
1da177e4
LT		 2204 err = proto_register(&l2cap_proto, 0);
2205 if (err < 0)
2206 return err;
2207
2208 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
2209 if (err < 0) {
2210 BT_ERR("L2CAP socket registration failed");
2211 goto error;
2212 }
2213
2214 err = hci_register_proto(&l2cap_hci_proto);
2215 if (err < 0) {
2216 BT_ERR("L2CAP protocol registration failed");
2217 bt_sock_unregister(BTPROTO_L2CAP);
2218 goto error;
2219 }
2220
be9d1227 2221 class_create_file(&bt_class, &class_attr_l2cap);
1da177e4
LT		 2222
2223 BT_INFO("L2CAP ver %s", VERSION);
2224 BT_INFO("L2CAP socket layer initialized");
2225
2226 return 0;
2227
2228error:
2229 proto_unregister(&l2cap_proto);
2230 return err;
2231}
2232
2233static void __exit l2cap_exit(void)
2234{
be9d1227 2235 class_remove_file(&bt_class, &class_attr_l2cap);
1da177e4
LT		 2236
2237 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
2238 BT_ERR("L2CAP socket unregistration failed");
2239
2240 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
2241 BT_ERR("L2CAP protocol unregistration failed");
2242
2243 proto_unregister(&l2cap_proto);
2244}
2245
2246void l2cap_load(void)
2247{
2248 /* Dummy function to trigger automatic L2CAP module loading by
2249 * other modules that use L2CAP sockets but don't use any other
2250 * symbols from it. */
2251 return;
2252}
2253EXPORT_SYMBOL(l2cap_load);
2254
2255module_init(l2cap_init);
2256module_exit(l2cap_exit);
2257
2258MODULE_AUTHOR("Maxim Krasnyansky <maxk@qualcomm.com>, Marcel Holtmann <marcel@holtmann.org>");
2259MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
2260MODULE_VERSION(VERSION);
2261MODULE_LICENSE("GPL");
2262MODULE_ALIAS("bt-proto-0");
Linux kernel - Deliverables
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