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Bluetooth: fix missing parameter for HCI_OP_DISCONNECT
[linux.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <[email protected]>
5d8868ff 5 Copyright (C) 2010 Google Inc.
1da177e4
LT		 6
7 Written 2000,2001 by Maxim Krasnyansky <[email protected]>
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
8e87d142
YH		 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
1da177e4
LT		 20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21
8e87d142
YH		 22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 24 SOFTWARE IS DISCLAIMED.
25*/
26
bb58f747 27/* Bluetooth L2CAP core. */
1da177e4 28
1da177e4
LT		 29#include <linux/module.h>
30
31#include <linux/types.h>
4fc268d2 32#include <linux/capability.h>
1da177e4
LT		 33#include <linux/errno.h>
34#include <linux/kernel.h>
1da177e4
LT		 35#include <linux/sched.h>
36#include <linux/slab.h>
37#include <linux/poll.h>
38#include <linux/fcntl.h>
39#include <linux/init.h>
40#include <linux/interrupt.h>
41#include <linux/socket.h>
42#include <linux/skbuff.h>
1da177e4 43#include <linux/list.h>
be9d1227 44#include <linux/device.h>
aef7d97c
MH		 45#include <linux/debugfs.h>
46#include <linux/seq_file.h>
af05b30b 47#include <linux/uaccess.h>
fcc203c3 48#include <linux/crc16.h>
1da177e4
LT		 49#include <net/sock.h>
50
51#include <asm/system.h>
1da177e4
LT		 52#include <asm/unaligned.h>
53
54#include <net/bluetooth/bluetooth.h>
55#include <net/bluetooth/hci_core.h>
56#include <net/bluetooth/l2cap.h>
b501d6a1 57#include <net/bluetooth/smp.h>
1da177e4 58
bb58f747 59int disable_ertm;
f0709e03 60
47ec1dcd 61static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
e1027a7c 62static u8 l2cap_fixed_chan[8] = { 0x02, };
1da177e4 63
1890d36b
GP		 64static struct workqueue_struct *_busy_wq;
65
b5ad8b7f
JB		 66static LIST_HEAD(chan_list);
67static DEFINE_RWLOCK(chan_list_lock);
1da177e4 68
1890d36b
GP		 69static void l2cap_busy_work(struct work_struct *work);
70
1da177e4
LT		 71static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
72 u8 code, u8 ident, u16 dlen, void *data);
4519de9a
GP		 73static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
74 void *data);
710f9b0a 75static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
4519de9a
GP		 76static void l2cap_send_disconn_req(struct l2cap_conn *conn,
77 struct l2cap_chan *chan, int err);
1da177e4 78
218bb9df
GP		 79static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
80
0139418c 81/* ---- L2CAP channels ---- */
71ba0e56
GP		 82
83static inline void chan_hold(struct l2cap_chan *c)
84{
85 atomic_inc(&c->refcnt);
86}
87
88static inline void chan_put(struct l2cap_chan *c)
89{
90 if (atomic_dec_and_test(&c->refcnt))
91 kfree(c);
92}
93
baa7e1fa 94static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
0139418c 95{
48454079 96 struct l2cap_chan *c;
baa7e1fa
GP		 97
98 list_for_each_entry(c, &conn->chan_l, list) {
fe4128e0 99 if (c->dcid == cid)
baa7e1fa 100 return c;
0139418c 101 }
baa7e1fa
GP		 102 return NULL;
103
0139418c
MH		 104}
105
baa7e1fa 106static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 107{
48454079 108 struct l2cap_chan *c;
baa7e1fa
GP		 109
110 list_for_each_entry(c, &conn->chan_l, list) {
fe4128e0 111 if (c->scid == cid)
baa7e1fa 112 return c;
0139418c 113 }
baa7e1fa 114 return NULL;
0139418c
MH		 115}
116
117/* Find channel with given SCID.
118 * Returns locked socket */
baa7e1fa 119static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 120{
48454079 121 struct l2cap_chan *c;
baa7e1fa
GP		 122
123 read_lock(&conn->chan_lock);
124 c = __l2cap_get_chan_by_scid(conn, cid);
48454079
GP		 125 if (c)
126 bh_lock_sock(c->sk);
baa7e1fa 127 read_unlock(&conn->chan_lock);
48454079 128 return c;
0139418c
MH		 129}
130
baa7e1fa 131static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 132{
48454079 133 struct l2cap_chan *c;
baa7e1fa
GP		 134
135 list_for_each_entry(c, &conn->chan_l, list) {
fc7f8a7e 136 if (c->ident == ident)
baa7e1fa 137 return c;
0139418c 138 }
baa7e1fa 139 return NULL;
0139418c
MH		 140}
141
baa7e1fa 142static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 143{
48454079 144 struct l2cap_chan *c;
baa7e1fa
GP		 145
146 read_lock(&conn->chan_lock);
147 c = __l2cap_get_chan_by_ident(conn, ident);
48454079
GP		 148 if (c)
149 bh_lock_sock(c->sk);
baa7e1fa 150 read_unlock(&conn->chan_lock);
48454079 151 return c;
0139418c
MH		 152}
153
23691d75 154static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 155{
23691d75 156 struct l2cap_chan *c;
9e4425ff 157
23691d75
GP		 158 list_for_each_entry(c, &chan_list, global_l) {
159 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
9e4425ff
GP		 160 goto found;
161 }
162
23691d75 163 c = NULL;
9e4425ff 164found:
23691d75 165 return c;
9e4425ff
GP		 166}
167
168int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
169{
73b2ec18
GP		 170 int err;
171
23691d75 172 write_lock_bh(&chan_list_lock);
9e4425ff 173
23691d75 174 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 175 err = -EADDRINUSE;
176 goto done;
9e4425ff
GP		 177 }
178
73b2ec18
GP		 179 if (psm) {
180 chan->psm = psm;
181 chan->sport = psm;
182 err = 0;
183 } else {
184 u16 p;
185
186 err = -EINVAL;
187 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 188 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 189 chan->psm = cpu_to_le16(p);
190 chan->sport = cpu_to_le16(p);
191 err = 0;
192 break;
193 }
194 }
9e4425ff 195
73b2ec18 196done:
23691d75 197 write_unlock_bh(&chan_list_lock);
73b2ec18 198 return err;
9e4425ff
GP		 199}
200
201int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
202{
23691d75 203 write_lock_bh(&chan_list_lock);
9e4425ff
GP		 204
205 chan->scid = scid;
206
23691d75 207 write_unlock_bh(&chan_list_lock);
9e4425ff
GP		 208
209 return 0;
210}
211
baa7e1fa 212static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 213{
8db4dc46 214 u16 cid = L2CAP_CID_DYN_START;
0139418c 215
8db4dc46 216 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 217 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 218 return cid;
219 }
220
221 return 0;
222}
223
c9b66675 224static void l2cap_set_timer(struct l2cap_chan *chan, struct timer_list *timer, long timeout)
ab07801d 225{
89bc500e
GP		 226 BT_DBG("chan %p state %d timeout %ld", chan->sk, chan->state, timeout);
227
c9b66675 228 if (!mod_timer(timer, jiffies + timeout))
71ba0e56 229 chan_hold(chan);
ab07801d
GP		 230}
231
c9b66675 232static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer)
ab07801d 233{
89bc500e 234 BT_DBG("chan %p state %d", chan, chan->state);
ab07801d 235
c9b66675 236 if (timer_pending(timer) && del_timer(timer))
71ba0e56 237 chan_put(chan);
ab07801d
GP		 238}
239
89bc500e
GP		 240static void l2cap_state_change(struct l2cap_chan *chan, int state)
241{
242 chan->state = state;
243 chan->ops->state_change(chan->data, state);
244}
245
ab07801d
GP		 246static void l2cap_chan_timeout(unsigned long arg)
247{
248 struct l2cap_chan *chan = (struct l2cap_chan *) arg;
249 struct sock *sk = chan->sk;
250 int reason;
251
89bc500e 252 BT_DBG("chan %p state %d", chan, chan->state);
ab07801d
GP		 253
254 bh_lock_sock(sk);
255
256 if (sock_owned_by_user(sk)) {
257 /* sk is owned by user. Try again later */
c9b66675 258 __set_chan_timer(chan, HZ / 5);
ab07801d 259 bh_unlock_sock(sk);
71ba0e56 260 chan_put(chan);
ab07801d
GP		 261 return;
262 }
263
89bc500e 264 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 265 reason = ECONNREFUSED;
89bc500e 266 else if (chan->state == BT_CONNECT &&
ab07801d
GP		 267 chan->sec_level != BT_SECURITY_SDP)
268 reason = ECONNREFUSED;
269 else
270 reason = ETIMEDOUT;
271
0f852724 272 l2cap_chan_close(chan, reason);
ab07801d
GP		 273
274 bh_unlock_sock(sk);
275
ba3bd0ee 276 chan->ops->close(chan->data);
71ba0e56 277 chan_put(chan);
ab07801d
GP		 278}
279
23691d75 280struct l2cap_chan *l2cap_chan_create(struct sock *sk)
48454079
GP		 281{
282 struct l2cap_chan *chan;
283
284 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
285 if (!chan)
286 return NULL;
287
288 chan->sk = sk;
289
23691d75
GP		 290 write_lock_bh(&chan_list_lock);
291 list_add(&chan->global_l, &chan_list);
292 write_unlock_bh(&chan_list_lock);
293
ab07801d
GP		 294 setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan);
295
89bc500e
GP		 296 chan->state = BT_OPEN;
297
71ba0e56
GP		 298 atomic_set(&chan->refcnt, 1);
299
48454079
GP		 300 return chan;
301}
302
23691d75 303void l2cap_chan_destroy(struct l2cap_chan *chan)
6ff5abbf 304{
23691d75
GP		 305 write_lock_bh(&chan_list_lock);
306 list_del(&chan->global_l);
307 write_unlock_bh(&chan_list_lock);
308
71ba0e56 309 chan_put(chan);
6ff5abbf
GP		 310}
311
48454079 312static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 313{
af05b30b 314 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
fe4128e0 315 chan->psm, chan->dcid);
0139418c 316
2950f21a
MH		 317 conn->disc_reason = 0x13;
318
8c1d787b 319 chan->conn = conn;
0139418c 320
715ec005 321 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
b62f328b
VT		 322 if (conn->hcon->type == LE_LINK) {
323 /* LE connection */
0c1bc5c6 324 chan->omtu = L2CAP_LE_DEFAULT_MTU;
fe4128e0
GP		 325 chan->scid = L2CAP_CID_LE_DATA;
326 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 327 } else {
328 /* Alloc CID for connection-oriented socket */
fe4128e0 329 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 330 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 331 }
715ec005 332 } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
0139418c 333 /* Connectionless socket */
fe4128e0
GP		 334 chan->scid = L2CAP_CID_CONN_LESS;
335 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 336 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 337 } else {
338 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 339 chan->scid = L2CAP_CID_SIGNALING;
340 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 341 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 342 }
343
71ba0e56 344 chan_hold(chan);
baa7e1fa
GP		 345
346 list_add(&chan->list, &conn->chan_l);
0139418c
MH		 347}
348
8e87d142 349/* Delete channel.
0139418c 350 * Must be called on the locked socket. */
4519de9a 351static void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 352{
48454079 353 struct sock *sk = chan->sk;
8c1d787b 354 struct l2cap_conn *conn = chan->conn;
0139418c
MH		 355 struct sock *parent = bt_sk(sk)->parent;
356
c9b66675 357 __clear_chan_timer(chan);
0139418c 358
49208c9c 359 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 360
8e87d142 361 if (conn) {
baa7e1fa
GP		 362 /* Delete from channel list */
363 write_lock_bh(&conn->chan_lock);
364 list_del(&chan->list);
365 write_unlock_bh(&conn->chan_lock);
71ba0e56 366 chan_put(chan);
baa7e1fa 367
8c1d787b 368 chan->conn = NULL;
0139418c
MH		 369 hci_conn_put(conn->hcon);
370 }
371
89bc500e 372 l2cap_state_change(chan, BT_CLOSED);
0139418c
MH		 373 sock_set_flag(sk, SOCK_ZAPPED);
374
375 if (err)
376 sk->sk_err = err;
377
378 if (parent) {
379 bt_accept_unlink(sk);
380 parent->sk_data_ready(parent, 0);
381 } else
382 sk->sk_state_change(sk);
c13ffa62 383
b4450035
GP		 384 if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE &&
385 chan->conf_state & L2CAP_CONF_INPUT_DONE))
6ff5abbf 386 return;
2ead70b8 387
58d35f87 388 skb_queue_purge(&chan->tx_q);
c13ffa62 389
0c1bc5c6 390 if (chan->mode == L2CAP_MODE_ERTM) {
c13ffa62
GP		 391 struct srej_list *l, *tmp;
392
1a09bcb9
GP		 393 __clear_retrans_timer(chan);
394 __clear_monitor_timer(chan);
395 __clear_ack_timer(chan);
c13ffa62 396
f1c6775b
GP		 397 skb_queue_purge(&chan->srej_q);
398 skb_queue_purge(&chan->busy_q);
c13ffa62 399
39d5a3ee 400 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
c13ffa62
GP		 401 list_del(&l->list);
402 kfree(l);
403 }
404 }
0139418c
MH		 405}
406
4519de9a
GP		 407static void l2cap_chan_cleanup_listen(struct sock *parent)
408{
409 struct sock *sk;
410
411 BT_DBG("parent %p", parent);
412
413 /* Close not yet accepted channels */
0f852724 414 while ((sk = bt_accept_dequeue(parent, NULL))) {
ba3bd0ee 415 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
c9b66675 416 __clear_chan_timer(chan);
0f852724 417 lock_sock(sk);
ba3bd0ee 418 l2cap_chan_close(chan, ECONNRESET);
0f852724 419 release_sock(sk);
ba3bd0ee 420 chan->ops->close(chan->data);
0f852724 421 }
4519de9a
GP		 422}
423
0f852724 424void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 425{
426 struct l2cap_conn *conn = chan->conn;
427 struct sock *sk = chan->sk;
428
89bc500e 429 BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket);
4519de9a 430
89bc500e 431 switch (chan->state) {
4519de9a
GP		 432 case BT_LISTEN:
433 l2cap_chan_cleanup_listen(sk);
89bc500e
GP		 434
435 l2cap_state_change(chan, BT_CLOSED);
436 sock_set_flag(sk, SOCK_ZAPPED);
4519de9a
GP		 437 break;
438
439 case BT_CONNECTED:
440 case BT_CONFIG:
715ec005 441 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a 442 conn->hcon->type == ACL_LINK) {
c9b66675
GP		 443 __clear_chan_timer(chan);
444 __set_chan_timer(chan, sk->sk_sndtimeo);
4519de9a
GP		 445 l2cap_send_disconn_req(conn, chan, reason);
446 } else
447 l2cap_chan_del(chan, reason);
448 break;
449
450 case BT_CONNECT2:
715ec005 451 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a
GP		 452 conn->hcon->type == ACL_LINK) {
453 struct l2cap_conn_rsp rsp;
454 __u16 result;
455
456 if (bt_sk(sk)->defer_setup)
457 result = L2CAP_CR_SEC_BLOCK;
458 else
459 result = L2CAP_CR_BAD_PSM;
89bc500e 460 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 461
462 rsp.scid = cpu_to_le16(chan->dcid);
463 rsp.dcid = cpu_to_le16(chan->scid);
464 rsp.result = cpu_to_le16(result);
465 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
466 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
467 sizeof(rsp), &rsp);
468 }
469
470 l2cap_chan_del(chan, reason);
471 break;
472
473 case BT_CONNECT:
474 case BT_DISCONN:
475 l2cap_chan_del(chan, reason);
476 break;
477
478 default:
479 sock_set_flag(sk, SOCK_ZAPPED);
480 break;
481 }
482}
483
4343478f 484static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 485{
715ec005 486 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 487 switch (chan->sec_level) {
8556edd3
JH		 488 case BT_SECURITY_HIGH:
489 return HCI_AT_DEDICATED_BONDING_MITM;
490 case BT_SECURITY_MEDIUM:
491 return HCI_AT_DEDICATED_BONDING;
492 default:
493 return HCI_AT_NO_BONDING;
494 }
fe4128e0 495 } else if (chan->psm == cpu_to_le16(0x0001)) {
4343478f
GP		 496 if (chan->sec_level == BT_SECURITY_LOW)
497 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 498
4343478f 499 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 500 return HCI_AT_NO_BONDING_MITM;
00ae4af9 501 else
8556edd3 502 return HCI_AT_NO_BONDING;
00ae4af9 503 } else {
4343478f 504 switch (chan->sec_level) {
00ae4af9 505 case BT_SECURITY_HIGH:
8556edd3 506 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 507 case BT_SECURITY_MEDIUM:
8556edd3 508 return HCI_AT_GENERAL_BONDING;
00ae4af9 509 default:
8556edd3 510 return HCI_AT_NO_BONDING;
00ae4af9 511 }
0684e5f9 512 }
8556edd3
JH		 513}
514
515/* Service level security */
4343478f 516static inline int l2cap_check_security(struct l2cap_chan *chan)
8556edd3 517{
8c1d787b 518 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 519 __u8 auth_type;
520
4343478f 521 auth_type = l2cap_get_auth_type(chan);
79d554a6 522
4343478f 523 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 524}
525
b5ad8b7f 526static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 527{
528 u8 id;
529
530 /* Get next available identificator.
531 * 1 - 128 are used by kernel.
532 * 129 - 199 are reserved.
533 * 200 - 254 are used by utilities like l2ping, etc.
534 */
535
536 spin_lock_bh(&conn->lock);
537
538 if (++conn->tx_ident > 128)
539 conn->tx_ident = 1;
540
541 id = conn->tx_ident;
542
543 spin_unlock_bh(&conn->lock);
544
545 return id;
546}
547
4519de9a 548static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 549{
550 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 551 u8 flags;
4e8402a3
MH		 552
553 BT_DBG("code 0x%2.2x", code);
554
555 if (!skb)
9a9c6a34 556 return;
4e8402a3 557
e702112f
AE		 558 if (lmp_no_flush_capable(conn->hcon->hdev))
559 flags = ACL_START_NO_FLUSH;
560 else
561 flags = ACL_START;
562
14b12d0b
JG		 563 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
564
e702112f 565 hci_send_acl(conn->hcon, skb, flags);
4e8402a3
MH		 566}
567
525cd185 568static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control)
1c2acffb
GP		 569{
570 struct sk_buff *skb;
571 struct l2cap_hdr *lh;
8c1d787b 572 struct l2cap_conn *conn = chan->conn;
fcc203c3 573 int count, hlen = L2CAP_HDR_SIZE + 2;
e702112f 574 u8 flags;
fcc203c3 575
89bc500e 576 if (chan->state != BT_CONNECTED)
c13ffa62
GP		 577 return;
578
47d1ec61 579 if (chan->fcs == L2CAP_FCS_CRC16)
fcc203c3 580 hlen += 2;
1c2acffb 581
49208c9c 582 BT_DBG("chan %p, control 0x%2.2x", chan, control);
1c2acffb 583
fcc203c3 584 count = min_t(unsigned int, conn->mtu, hlen);
1c2acffb
GP		 585 control |= L2CAP_CTRL_FRAME_TYPE;
586
525cd185 587 if (chan->conn_state & L2CAP_CONN_SEND_FBIT) {
9e917af1 588 control |= L2CAP_CTRL_FINAL;
525cd185 589 chan->conn_state &= ~L2CAP_CONN_SEND_FBIT;
9e917af1
GP		 590 }
591
525cd185 592 if (chan->conn_state & L2CAP_CONN_SEND_PBIT) {
f0946ccf 593 control |= L2CAP_CTRL_POLL;
525cd185 594 chan->conn_state &= ~L2CAP_CONN_SEND_PBIT;
f0946ccf
GP		 595 }
596
1c2acffb
GP		 597 skb = bt_skb_alloc(count, GFP_ATOMIC);
598 if (!skb)
9a9c6a34 599 return;
1c2acffb
GP		 600
601 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fcc203c3 602 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
fe4128e0 603 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb
GP		 604 put_unaligned_le16(control, skb_put(skb, 2));
605
47d1ec61 606 if (chan->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 607 u16 fcs = crc16(0, (u8 *)lh, count - 2);
608 put_unaligned_le16(fcs, skb_put(skb, 2));
609 }
610
e702112f
AE		 611 if (lmp_no_flush_capable(conn->hcon->hdev))
612 flags = ACL_START_NO_FLUSH;
613 else
614 flags = ACL_START;
615
14b12d0b
JG		 616 bt_cb(skb)->force_active = chan->force_active;
617
8c1d787b 618 hci_send_acl(chan->conn->hcon, skb, flags);
1c2acffb
GP		 619}
620
525cd185 621static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control)
7e743090 622{
525cd185 623 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
7e743090 624 control |= L2CAP_SUPER_RCV_NOT_READY;
525cd185 625 chan->conn_state |= L2CAP_CONN_RNR_SENT;
1890d36b 626 } else
7e743090
GP		 627 control |= L2CAP_SUPER_RCV_READY;
628
42e5c802 629 control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
2ab25cdd 630
525cd185 631 l2cap_send_sframe(chan, control);
7e743090
GP		 632}
633
b4450035 634static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 635{
b4450035 636 return !(chan->conf_state & L2CAP_CONF_CONNECT_PEND);
e501d055
AE		 637}
638
fc7f8a7e 639static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 640{
8c1d787b 641 struct l2cap_conn *conn = chan->conn;
79d554a6
MH		 642
643 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 644 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
645 return;
646
4343478f
GP		 647 if (l2cap_check_security(chan) &&
648 __l2cap_no_conn_pending(chan)) {
b1235d79 649 struct l2cap_conn_req req;
fe4128e0
GP		 650 req.scid = cpu_to_le16(chan->scid);
651 req.psm = chan->psm;
79d554a6 652
fc7f8a7e 653 chan->ident = l2cap_get_ident(conn);
b4450035 654 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
79d554a6 655
fc7f8a7e
GP		 656 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
657 sizeof(req), &req);
b1235d79 658 }
79d554a6
MH		 659 } else {
660 struct l2cap_info_req req;
661 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
662
663 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
664 conn->info_ident = l2cap_get_ident(conn);
665
666 mod_timer(&conn->info_timer, jiffies +
667 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
668
669 l2cap_send_cmd(conn, conn->info_ident,
670 L2CAP_INFO_REQ, sizeof(req), &req);
671 }
672}
673
cf6c2c0b
GP		 674static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
675{
676 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 677 if (!disable_ertm)
cf6c2c0b
GP		 678 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
679
680 switch (mode) {
681 case L2CAP_MODE_ERTM:
682 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
683 case L2CAP_MODE_STREAMING:
684 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
685 default:
686 return 0x00;
687 }
688}
689
4519de9a 690static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
22121fc9 691{
e92c8e70 692 struct sock *sk;
22121fc9
GP		 693 struct l2cap_disconn_req req;
694
c13ffa62
GP		 695 if (!conn)
696 return;
697
e92c8e70
GP		 698 sk = chan->sk;
699
0c1bc5c6 700 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 701 __clear_retrans_timer(chan);
702 __clear_monitor_timer(chan);
703 __clear_ack_timer(chan);
c13ffa62
GP		 704 }
705
fe4128e0
GP		 706 req.dcid = cpu_to_le16(chan->dcid);
707 req.scid = cpu_to_le16(chan->scid);
22121fc9
GP		 708 l2cap_send_cmd(conn, l2cap_get_ident(conn),
709 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62 710
89bc500e 711 l2cap_state_change(chan, BT_DISCONN);
9b108fc0 712 sk->sk_err = err;
22121fc9
GP		 713}
714
1da177e4 715/* ---- L2CAP connections ---- */
4e8402a3
MH		 716static void l2cap_conn_start(struct l2cap_conn *conn)
717{
820ffdb3 718 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 719
720 BT_DBG("conn %p", conn);
721
baa7e1fa 722 read_lock(&conn->chan_lock);
4e8402a3 723
820ffdb3 724 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 725 struct sock *sk = chan->sk;
baa7e1fa 726
4e8402a3
MH		 727 bh_lock_sock(sk);
728
715ec005 729 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
79d554a6
MH		 730 bh_unlock_sock(sk);
731 continue;
732 }
733
89bc500e 734 if (chan->state == BT_CONNECT) {
47731de7 735 struct l2cap_conn_req req;
79d554a6 736
4343478f 737 if (!l2cap_check_security(chan) ||
b4450035 738 !__l2cap_no_conn_pending(chan)) {
47731de7
GP		 739 bh_unlock_sock(sk);
740 continue;
741 }
79d554a6 742
0c1bc5c6 743 if (!l2cap_mode_supported(chan->mode,
47731de7 744 conn->feat_mask)
b4450035 745 && chan->conf_state &
47731de7 746 L2CAP_CONF_STATE2_DEVICE) {
0f852724 747 /* l2cap_chan_close() calls list_del(chan)
820ffdb3
GP		 748 * so release the lock */
749 read_unlock_bh(&conn->chan_lock);
89bc500e 750 l2cap_chan_close(chan, ECONNRESET);
820ffdb3 751 read_lock_bh(&conn->chan_lock);
47731de7
GP		 752 bh_unlock_sock(sk);
753 continue;
b1235d79 754 }
47731de7 755
fe4128e0
GP		 756 req.scid = cpu_to_le16(chan->scid);
757 req.psm = chan->psm;
47731de7 758
fc7f8a7e 759 chan->ident = l2cap_get_ident(conn);
b4450035 760 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
47731de7 761
fc7f8a7e
GP		 762 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
763 sizeof(req), &req);
47731de7 764
89bc500e 765 } else if (chan->state == BT_CONNECT2) {
79d554a6 766 struct l2cap_conn_rsp rsp;
e9aeb2dd 767 char buf[128];
fe4128e0
GP		 768 rsp.scid = cpu_to_le16(chan->dcid);
769 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 770
4343478f 771 if (l2cap_check_security(chan)) {
f66dc81f
MH		 772 if (bt_sk(sk)->defer_setup) {
773 struct sock *parent = bt_sk(sk)->parent;
774 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
775 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
776 parent->sk_data_ready(parent, 0);
777
778 } else {
89bc500e 779 l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 780 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
781 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
782 }
79d554a6
MH		 783 } else {
784 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
785 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
786 }
787
fc7f8a7e
GP		 788 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
789 sizeof(rsp), &rsp);
e9aeb2dd 790
b4450035 791 if (chan->conf_state & L2CAP_CONF_REQ_SENT ||
e9aeb2dd
GP		 792 rsp.result != L2CAP_CR_SUCCESS) {
793 bh_unlock_sock(sk);
794 continue;
795 }
796
b4450035 797 chan->conf_state |= L2CAP_CONF_REQ_SENT;
e9aeb2dd 798 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 799 l2cap_build_conf_req(chan, buf), buf);
800 chan->num_conf_req++;
4e8402a3
MH		 801 }
802
803 bh_unlock_sock(sk);
804 }
805
baa7e1fa 806 read_unlock(&conn->chan_lock);
4e8402a3
MH		 807}
808
b62f328b
VT		 809/* Find socket with cid and source bdaddr.
810 * Returns closest match, locked.
811 */
23691d75 812static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src)
b62f328b 813{
23691d75 814 struct l2cap_chan *c, *c1 = NULL;
b62f328b 815
23691d75 816 read_lock(&chan_list_lock);
b62f328b 817
23691d75
GP		 818 list_for_each_entry(c, &chan_list, global_l) {
819 struct sock *sk = c->sk;
fe4128e0 820
89bc500e 821 if (state && c->state != state)
b62f328b
VT		 822 continue;
823
23691d75 824 if (c->scid == cid) {
b62f328b 825 /* Exact match. */
23691d75
GP		 826 if (!bacmp(&bt_sk(sk)->src, src)) {
827 read_unlock(&chan_list_lock);
828 return c;
829 }
b62f328b
VT		 830
831 /* Closest match */
832 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
23691d75 833 c1 = c;
b62f328b
VT		 834 }
835 }
280f294f 836
23691d75 837 read_unlock(&chan_list_lock);
b62f328b 838
23691d75 839 return c1;
b62f328b
VT		 840}
841
842static void l2cap_le_conn_ready(struct l2cap_conn *conn)
843{
c916fbe4 844 struct sock *parent, *sk;
23691d75 845 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 846
847 BT_DBG("");
848
849 /* Check if we have socket listening on cid */
23691d75 850 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
b62f328b 851 conn->src);
23691d75 852 if (!pchan)
b62f328b
VT		 853 return;
854
23691d75
GP		 855 parent = pchan->sk;
856
62f3a2cf
GP		 857 bh_lock_sock(parent);
858
b62f328b
VT		 859 /* Check for backlog size */
860 if (sk_acceptq_is_full(parent)) {
861 BT_DBG("backlog full %d", parent->sk_ack_backlog);
862 goto clean;
863 }
864
80808e43
GP		 865 chan = pchan->ops->new_connection(pchan->data);
866 if (!chan)
b62f328b
VT		 867 goto clean;
868
80808e43 869 sk = chan->sk;
5d41ce1d 870
baa7e1fa 871 write_lock_bh(&conn->chan_lock);
b62f328b
VT		 872
873 hci_conn_hold(conn->hcon);
874
b62f328b
VT		 875 bacpy(&bt_sk(sk)->src, conn->src);
876 bacpy(&bt_sk(sk)->dst, conn->dst);
877
d1010240
GP		 878 bt_accept_enqueue(parent, sk);
879
48454079
GP		 880 __l2cap_chan_add(conn, chan);
881
c9b66675 882 __set_chan_timer(chan, sk->sk_sndtimeo);
b62f328b 883
89bc500e 884 l2cap_state_change(chan, BT_CONNECTED);
b62f328b
VT		 885 parent->sk_data_ready(parent, 0);
886
baa7e1fa 887 write_unlock_bh(&conn->chan_lock);
b62f328b
VT		 888
889clean:
890 bh_unlock_sock(parent);
891}
892
f1cb9af5
VCG		 893static void l2cap_chan_ready(struct sock *sk)
894{
895 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
896 struct sock *parent = bt_sk(sk)->parent;
897
898 BT_DBG("sk %p, parent %p", sk, parent);
899
900 chan->conf_state = 0;
901 __clear_chan_timer(chan);
902
903 sk->sk_state = BT_CONNECTED;
904 sk->sk_state_change(sk);
905
906 if (parent)
907 parent->sk_data_ready(parent, 0);
908}
909
4e8402a3
MH		 910static void l2cap_conn_ready(struct l2cap_conn *conn)
911{
48454079 912 struct l2cap_chan *chan;
4e8402a3 913
79d554a6 914 BT_DBG("conn %p", conn);
4e8402a3 915
b62f328b
VT		 916 if (!conn->hcon->out && conn->hcon->type == LE_LINK)
917 l2cap_le_conn_ready(conn);
918
baa7e1fa 919 read_lock(&conn->chan_lock);
4e8402a3 920
baa7e1fa 921 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 922 struct sock *sk = chan->sk;
baa7e1fa 923
79d554a6 924 bh_lock_sock(sk);
4e8402a3 925
f1cb9af5 926 if (conn->hcon->type == LE_LINK)
b501d6a1 927 if (smp_conn_security(conn, chan->sec_level))
f1cb9af5 928 l2cap_chan_ready(sk);
acd7d370 929
715ec005 930 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 931 __clear_chan_timer(chan);
89bc500e 932 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 933 sk->sk_state_change(sk);
b501d6a1 934
89bc500e 935 } else if (chan->state == BT_CONNECT)
fc7f8a7e 936 l2cap_do_start(chan);
4e8402a3 937
79d554a6 938 bh_unlock_sock(sk);
4e8402a3 939 }
79d554a6 940
baa7e1fa 941 read_unlock(&conn->chan_lock);
4e8402a3
MH		 942}
943
944/* Notify sockets that we cannot guaranty reliability anymore */
945static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
946{
48454079 947 struct l2cap_chan *chan;
4e8402a3
MH		 948
949 BT_DBG("conn %p", conn);
950
baa7e1fa 951 read_lock(&conn->chan_lock);
4e8402a3 952
baa7e1fa 953 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 954 struct sock *sk = chan->sk;
baa7e1fa 955
4343478f 956 if (chan->force_reliable)
4e8402a3
MH		 957 sk->sk_err = err;
958 }
959
baa7e1fa 960 read_unlock(&conn->chan_lock);
4e8402a3
MH		 961}
962
963static void l2cap_info_timeout(unsigned long arg)
964{
965 struct l2cap_conn *conn = (void *) arg;
966
984947dc 967 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 968 conn->info_ident = 0;
984947dc 969
4e8402a3
MH		 970 l2cap_conn_start(conn);
971}
972
1da177e4
LT		 973static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
974{
0139418c 975 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 976
0139418c 977 if (conn || status)
1da177e4
LT		 978 return conn;
979
0139418c
MH		 980 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
981 if (!conn)
1da177e4 982 return NULL;
1da177e4
LT		 983
984 hcon->l2cap_data = conn;
985 conn->hcon = hcon;
986
0139418c
MH		 987 BT_DBG("hcon %p conn %p", hcon, conn);
988
acd7d370
VT		 989 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
990 conn->mtu = hcon->hdev->le_mtu;
991 else
992 conn->mtu = hcon->hdev->acl_mtu;
993
1da177e4
LT		 994 conn->src = &hcon->hdev->bdaddr;
995 conn->dst = &hcon->dst;
996
4e8402a3
MH		 997 conn->feat_mask = 0;
998
1da177e4 999 spin_lock_init(&conn->lock);
baa7e1fa
GP		 1000 rwlock_init(&conn->chan_lock);
1001
1002 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1003
b62f328b
VT		 1004 if (hcon->type != LE_LINK)
1005 setup_timer(&conn->info_timer, l2cap_info_timeout,
45054dc1
DY		 1006 (unsigned long) conn);
1007
2950f21a
MH		 1008 conn->disc_reason = 0x13;
1009
1da177e4
LT		 1010 return conn;
1011}
1012
0139418c 1013static void l2cap_conn_del(struct hci_conn *hcon, int err)
1da177e4 1014{
0139418c 1015 struct l2cap_conn *conn = hcon->l2cap_data;
baa7e1fa 1016 struct l2cap_chan *chan, *l;
1da177e4
LT		 1017 struct sock *sk;
1018
0139418c
MH		 1019 if (!conn)
1020 return;
1da177e4
LT		 1021
1022 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1023
7585b97a 1024 kfree_skb(conn->rx_skb);
1da177e4
LT		 1025
1026 /* Kill channels */
baa7e1fa 1027 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
48454079 1028 sk = chan->sk;
1da177e4 1029 bh_lock_sock(sk);
48454079 1030 l2cap_chan_del(chan, err);
1da177e4 1031 bh_unlock_sock(sk);
ba3bd0ee 1032 chan->ops->close(chan->data);
1da177e4
LT		 1033 }
1034
8e8440f5
DY		 1035 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1036 del_timer_sync(&conn->info_timer);
3ab22731 1037
1da177e4
LT		 1038 hcon->l2cap_data = NULL;
1039 kfree(conn);
1da177e4
LT		 1040}
1041
48454079 1042static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
1da177e4 1043{
baa7e1fa 1044 write_lock_bh(&conn->chan_lock);
48454079 1045 __l2cap_chan_add(conn, chan);
baa7e1fa 1046 write_unlock_bh(&conn->chan_lock);
1da177e4
LT		 1047}
1048
1da177e4 1049/* ---- Socket interface ---- */
1da177e4
LT		 1050
1051/* Find socket with psm and source bdaddr.
1052 * Returns closest match.
1053 */
23691d75 1054static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4 1055{
23691d75 1056 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1057
23691d75 1058 read_lock(&chan_list_lock);
e0f0cb56 1059
23691d75
GP		 1060 list_for_each_entry(c, &chan_list, global_l) {
1061 struct sock *sk = c->sk;
fe4128e0 1062
89bc500e 1063 if (state && c->state != state)
1da177e4
LT		 1064 continue;
1065
23691d75 1066 if (c->psm == psm) {
1da177e4 1067 /* Exact match. */
23691d75 1068 if (!bacmp(&bt_sk(sk)->src, src)) {
a7567b20 1069 read_unlock(&chan_list_lock);
23691d75
GP		 1070 return c;
1071 }
1da177e4
LT		 1072
1073 /* Closest match */
1074 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
23691d75 1075 c1 = c;
1da177e4
LT		 1076 }
1077 }
1da177e4 1078
23691d75 1079 read_unlock(&chan_list_lock);
e0f0cb56 1080
23691d75 1081 return c1;
1da177e4
LT		 1082}
1083
77a74c7e 1084int l2cap_chan_connect(struct l2cap_chan *chan)
1da177e4 1085{
5d41ce1d 1086 struct sock *sk = chan->sk;
1da177e4
LT		 1087 bdaddr_t *src = &bt_sk(sk)->src;
1088 bdaddr_t *dst = &bt_sk(sk)->dst;
1089 struct l2cap_conn *conn;
1090 struct hci_conn *hcon;
1091 struct hci_dev *hdev;
09ab6f4c 1092 __u8 auth_type;
44d0e48e 1093 int err;
1da177e4 1094
f29972de 1095 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
fe4128e0 1096 chan->psm);
1da177e4 1097
af05b30b
GP		 1098 hdev = hci_get_route(dst, src);
1099 if (!hdev)
1da177e4
LT		 1100 return -EHOSTUNREACH;
1101
1102 hci_dev_lock_bh(hdev);
1103
4343478f 1104 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1105
fe4128e0 1106 if (chan->dcid == L2CAP_CID_LE_DATA)
acd7d370 1107 hcon = hci_connect(hdev, LE_LINK, dst,
4343478f 1108 chan->sec_level, auth_type);
acd7d370
VT		 1109 else
1110 hcon = hci_connect(hdev, ACL_LINK, dst,
4343478f 1111 chan->sec_level, auth_type);
acd7d370 1112
30e76272
VT		 1113 if (IS_ERR(hcon)) {
1114 err = PTR_ERR(hcon);
1da177e4 1115 goto done;
30e76272 1116 }
1da177e4
LT		 1117
1118 conn = l2cap_conn_add(hcon, 0);
1119 if (!conn) {
1120 hci_conn_put(hcon);
30e76272 1121 err = -ENOMEM;
1da177e4
LT		 1122 goto done;
1123 }
1124
1da177e4
LT		 1125 /* Update source addr of the socket */
1126 bacpy(src, conn->src);
1127
48454079
GP		 1128 l2cap_chan_add(conn, chan);
1129
89bc500e 1130 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1131 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1132
1133 if (hcon->state == BT_CONNECTED) {
715ec005 1134 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1135 __clear_chan_timer(chan);
4343478f 1136 if (l2cap_check_security(chan))
89bc500e 1137 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1138 } else
fc7f8a7e 1139 l2cap_do_start(chan);
1da177e4
LT		 1140 }
1141
30e76272
VT		 1142 err = 0;
1143
1da177e4
LT		 1144done:
1145 hci_dev_unlock_bh(hdev);
1146 hci_dev_put(hdev);
1147 return err;
1148}
1149
dcba0dba 1150int __l2cap_wait_ack(struct sock *sk)
6161c038 1151{
8c1d787b 1152 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1153 DECLARE_WAITQUEUE(wait, current);
1154 int err = 0;
1155 int timeo = HZ/5;
1156
2b0b05dd 1157 add_wait_queue(sk_sleep(sk), &wait);
8c1d787b 1158 while ((chan->unacked_frames > 0 && chan->conn)) {
6161c038
GP		 1159 set_current_state(TASK_INTERRUPTIBLE);
1160
1161 if (!timeo)
1162 timeo = HZ/5;
1163
1164 if (signal_pending(current)) {
1165 err = sock_intr_errno(timeo);
1166 break;
1167 }
1168
1169 release_sock(sk);
1170 timeo = schedule_timeout(timeo);
1171 lock_sock(sk);
1172
1173 err = sock_error(sk);
1174 if (err)
1175 break;
1176 }
1177 set_current_state(TASK_RUNNING);
2b0b05dd 1178 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1179 return err;
1180}
1181
e90bac06
GP		 1182static void l2cap_monitor_timeout(unsigned long arg)
1183{
525cd185
GP		 1184 struct l2cap_chan *chan = (void *) arg;
1185 struct sock *sk = chan->sk;
e90bac06 1186
525cd185 1187 BT_DBG("chan %p", chan);
0e98958d 1188
e686219a 1189 bh_lock_sock(sk);
2c03a7a4 1190 if (chan->retry_count >= chan->remote_max_tx) {
8c1d787b 1191 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
b13f5860 1192 bh_unlock_sock(sk);
e90bac06
GP		 1193 return;
1194 }
1195
6a026610 1196 chan->retry_count++;
1a09bcb9 1197 __set_monitor_timer(chan);
e90bac06 1198
525cd185 1199 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
e686219a 1200 bh_unlock_sock(sk);
e90bac06
GP		 1201}
1202
1203static void l2cap_retrans_timeout(unsigned long arg)
1204{
525cd185
GP		 1205 struct l2cap_chan *chan = (void *) arg;
1206 struct sock *sk = chan->sk;
e90bac06 1207
49208c9c 1208 BT_DBG("chan %p", chan);
0e98958d 1209
e686219a 1210 bh_lock_sock(sk);
6a026610 1211 chan->retry_count = 1;
1a09bcb9 1212 __set_monitor_timer(chan);
e90bac06 1213
525cd185 1214 chan->conn_state |= L2CAP_CONN_WAIT_F;
e90bac06 1215
525cd185 1216 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
e686219a 1217 bh_unlock_sock(sk);
e90bac06
GP		 1218}
1219
42e5c802 1220static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
1da177e4 1221{
1c2acffb 1222 struct sk_buff *skb;
1da177e4 1223
58d35f87 1224 while ((skb = skb_peek(&chan->tx_q)) &&
6a026610 1225 chan->unacked_frames) {
42e5c802 1226 if (bt_cb(skb)->tx_seq == chan->expected_ack_seq)
1c2acffb 1227 break;
1da177e4 1228
58d35f87 1229 skb = skb_dequeue(&chan->tx_q);
1c2acffb 1230 kfree_skb(skb);
1da177e4 1231
6a026610 1232 chan->unacked_frames--;
1c2acffb 1233 }
1da177e4 1234
6a026610 1235 if (!chan->unacked_frames)
1a09bcb9 1236 __clear_retrans_timer(chan);
1c2acffb 1237}
1da177e4 1238
4343478f 1239void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
1c2acffb 1240{
8c1d787b 1241 struct hci_conn *hcon = chan->conn->hcon;
e702112f 1242 u16 flags;
1c2acffb 1243
4343478f 1244 BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len);
1da177e4 1245
4343478f 1246 if (!chan->flushable && lmp_no_flush_capable(hcon->hdev))
e702112f
AE		 1247 flags = ACL_START_NO_FLUSH;
1248 else
1249 flags = ACL_START;
1250
14b12d0b 1251 bt_cb(skb)->force_active = chan->force_active;
e702112f 1252 hci_send_acl(hcon, skb, flags);
1c2acffb
GP		 1253}
1254
42e5c802 1255void l2cap_streaming_send(struct l2cap_chan *chan)
6840ed07 1256{
ccbb84af 1257 struct sk_buff *skb;
fcc203c3 1258 u16 control, fcs;
6840ed07 1259
58d35f87 1260 while ((skb = skb_dequeue(&chan->tx_q))) {
ccbb84af 1261 control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
42e5c802 1262 control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
ccbb84af 1263 put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
6840ed07 1264
47d1ec61 1265 if (chan->fcs == L2CAP_FCS_CRC16) {
ccbb84af
GP		 1266 fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
1267 put_unaligned_le16(fcs, skb->data + skb->len - 2);
fcc203c3
GP		 1268 }
1269
4343478f 1270 l2cap_do_send(chan, skb);
6840ed07 1271
42e5c802 1272 chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
6840ed07 1273 }
6840ed07
GP		 1274}
1275
525cd185 1276static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq)
8f17154f 1277{
8f17154f
GP		 1278 struct sk_buff *skb, *tx_skb;
1279 u16 control, fcs;
8f17154f 1280
58d35f87 1281 skb = skb_peek(&chan->tx_q);
f11d676d
GP		 1282 if (!skb)
1283 return;
8f17154f 1284
f11d676d
GP		 1285 do {
1286 if (bt_cb(skb)->tx_seq == tx_seq)
8f17154f 1287 break;
8f17154f 1288
58d35f87 1289 if (skb_queue_is_last(&chan->tx_q, skb))
f11d676d 1290 return;
8f17154f 1291
58d35f87 1292 } while ((skb = skb_queue_next(&chan->tx_q, skb)));
8f17154f 1293
2c03a7a4
GP		 1294 if (chan->remote_max_tx &&
1295 bt_cb(skb)->retries == chan->remote_max_tx) {
8c1d787b 1296 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
f11d676d
GP		 1297 return;
1298 }
1299
1300 tx_skb = skb_clone(skb, GFP_ATOMIC);
1301 bt_cb(skb)->retries++;
1302 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
a429b519 1303 control &= L2CAP_CTRL_SAR;
3cb123d1 1304
525cd185 1305 if (chan->conn_state & L2CAP_CONN_SEND_FBIT) {
3cb123d1 1306 control |= L2CAP_CTRL_FINAL;
525cd185 1307 chan->conn_state &= ~L2CAP_CONN_SEND_FBIT;
3cb123d1 1308 }
95ffa978 1309
42e5c802 1310 control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
f11d676d 1311 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
3cb123d1 1312
f11d676d
GP		 1313 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1314
47d1ec61 1315 if (chan->fcs == L2CAP_FCS_CRC16) {
f11d676d
GP		 1316 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1317 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1318 }
1319
4343478f 1320 l2cap_do_send(chan, tx_skb);
8f17154f
GP		 1321}
1322
525cd185 1323int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1324{
1325 struct sk_buff *skb, *tx_skb;
fcc203c3 1326 u16 control, fcs;
9a9c6a34 1327 int nsent = 0;
1c2acffb 1328
89bc500e 1329 if (chan->state != BT_CONNECTED)
c13ffa62 1330 return -ENOTCONN;
e90bac06 1331
58d35f87 1332 while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
1c2acffb 1333
2c03a7a4
GP		 1334 if (chan->remote_max_tx &&
1335 bt_cb(skb)->retries == chan->remote_max_tx) {
8c1d787b 1336 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
e90bac06
GP		 1337 break;
1338 }
1339
e420aba3
AE		 1340 tx_skb = skb_clone(skb, GFP_ATOMIC);
1341
e90bac06
GP		 1342 bt_cb(skb)->retries++;
1343
1c2acffb 1344 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
95ffa978
GP		 1345 control &= L2CAP_CTRL_SAR;
1346
525cd185 1347 if (chan->conn_state & L2CAP_CONN_SEND_FBIT) {
d5392c8f 1348 control |= L2CAP_CTRL_FINAL;
525cd185 1349 chan->conn_state &= ~L2CAP_CONN_SEND_FBIT;
d5392c8f 1350 }
42e5c802
GP		 1351 control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1352 | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1c2acffb
GP		 1353 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1354
e90bac06 1355
47d1ec61 1356 if (chan->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1357 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1358 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1359 }
1360
4343478f 1361 l2cap_do_send(chan, tx_skb);
9a9c6a34 1362
1a09bcb9 1363 __set_retrans_timer(chan);
1c2acffb 1364
42e5c802
GP		 1365 bt_cb(skb)->tx_seq = chan->next_tx_seq;
1366 chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
1c2acffb 1367
23e9fde2 1368 if (bt_cb(skb)->retries == 1)
6a026610 1369 chan->unacked_frames++;
23e9fde2 1370
6a026610 1371 chan->frames_sent++;
1c2acffb 1372
58d35f87
GP		 1373 if (skb_queue_is_last(&chan->tx_q, skb))
1374 chan->tx_send_head = NULL;
1c2acffb 1375 else
58d35f87 1376 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
9e917af1
GP		 1377
1378 nsent++;
1c2acffb
GP		 1379 }
1380
9e917af1
GP		 1381 return nsent;
1382}
1383
525cd185 1384static int l2cap_retransmit_frames(struct l2cap_chan *chan)
dfc909be 1385{
dfc909be
GP		 1386 int ret;
1387
58d35f87
GP		 1388 if (!skb_queue_empty(&chan->tx_q))
1389 chan->tx_send_head = chan->tx_q.next;
dfc909be 1390
42e5c802 1391 chan->next_tx_seq = chan->expected_ack_seq;
525cd185 1392 ret = l2cap_ertm_send(chan);
dfc909be
GP		 1393 return ret;
1394}
1395
525cd185 1396static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 1397{
9e917af1
GP		 1398 u16 control = 0;
1399
42e5c802 1400 control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
9e917af1 1401
525cd185 1402 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
9e917af1 1403 control |= L2CAP_SUPER_RCV_NOT_READY;
525cd185
GP		 1404 chan->conn_state |= L2CAP_CONN_RNR_SENT;
1405 l2cap_send_sframe(chan, control);
9a9c6a34 1406 return;
9e917af1 1407 }
dfc909be 1408
525cd185 1409 if (l2cap_ertm_send(chan) > 0)
dfc909be
GP		 1410 return;
1411
1412 control |= L2CAP_SUPER_RCV_READY;
525cd185 1413 l2cap_send_sframe(chan, control);
1c2acffb
GP		 1414}
1415
525cd185 1416static void l2cap_send_srejtail(struct l2cap_chan *chan)
99b0d4b7
GP		 1417{
1418 struct srej_list *tail;
1419 u16 control;
1420
1421 control = L2CAP_SUPER_SELECT_REJECT;
1422 control |= L2CAP_CTRL_FINAL;
1423
39d5a3ee 1424 tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
99b0d4b7
GP		 1425 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1426
525cd185 1427 l2cap_send_sframe(chan, control);
99b0d4b7
GP		 1428}
1429
1c2acffb
GP		 1430static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1431{
8c1d787b 1432 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
1c2acffb
GP		 1433 struct sk_buff **frag;
1434 int err, sent = 0;
1da177e4 1435
59203a21 1436 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1437 return -EFAULT;
1da177e4
LT		 1438
1439 sent += count;
1440 len -= count;
1441
1442 /* Continuation fragments (no L2CAP header) */
1443 frag = &skb_shinfo(skb)->frag_list;
1444 while (len) {
1445 count = min_t(unsigned int, conn->mtu, len);
1446
1447 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1448 if (!*frag)
0175d629 1449 return err;
1c2acffb
GP		 1450 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1451 return -EFAULT;
1da177e4
LT		 1452
1453 sent += count;
1454 len -= count;
1455
1456 frag = &(*frag)->next;
1457 }
1da177e4
LT		 1458
1459 return sent;
1c2acffb 1460}
1da177e4 1461
fe4128e0 1462struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1c2acffb 1463{
fe4128e0 1464 struct sock *sk = chan->sk;
8c1d787b 1465 struct l2cap_conn *conn = chan->conn;
1c2acffb
GP		 1466 struct sk_buff *skb;
1467 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1468 struct l2cap_hdr *lh;
1469
1470 BT_DBG("sk %p len %d", sk, (int)len);
1471
1472 count = min_t(unsigned int, (conn->mtu - hlen), len);
1473 skb = bt_skb_send_alloc(sk, count + hlen,
1474 msg->msg_flags & MSG_DONTWAIT, &err);
1475 if (!skb)
0175d629 1476 return ERR_PTR(err);
1c2acffb
GP		 1477
1478 /* Create L2CAP header */
1479 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1480 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 1481 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
fe4128e0 1482 put_unaligned_le16(chan->psm, skb_put(skb, 2));
1c2acffb
GP		 1483
1484 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1485 if (unlikely(err < 0)) {
1486 kfree_skb(skb);
1487 return ERR_PTR(err);
1488 }
1489 return skb;
1490}
1491
fe4128e0 1492struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1c2acffb 1493{
fe4128e0 1494 struct sock *sk = chan->sk;
8c1d787b 1495 struct l2cap_conn *conn = chan->conn;
1c2acffb
GP		 1496 struct sk_buff *skb;
1497 int err, count, hlen = L2CAP_HDR_SIZE;
1498 struct l2cap_hdr *lh;
1499
1500 BT_DBG("sk %p len %d", sk, (int)len);
1501
1502 count = min_t(unsigned int, (conn->mtu - hlen), len);
1503 skb = bt_skb_send_alloc(sk, count + hlen,
1504 msg->msg_flags & MSG_DONTWAIT, &err);
1505 if (!skb)
0175d629 1506 return ERR_PTR(err);
1c2acffb
GP		 1507
1508 /* Create L2CAP header */
1509 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1510 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb
GP		 1511 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1512
1513 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1514 if (unlikely(err < 0)) {
1515 kfree_skb(skb);
1516 return ERR_PTR(err);
1517 }
1518 return skb;
1519}
1520
47d1ec61 1521struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1c2acffb 1522{
47d1ec61 1523 struct sock *sk = chan->sk;
8c1d787b 1524 struct l2cap_conn *conn = chan->conn;
1c2acffb
GP		 1525 struct sk_buff *skb;
1526 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1527 struct l2cap_hdr *lh;
1528
1529 BT_DBG("sk %p len %d", sk, (int)len);
1530
0ee0d208
GP		 1531 if (!conn)
1532 return ERR_PTR(-ENOTCONN);
1533
c74e560c
GP		 1534 if (sdulen)
1535 hlen += 2;
1536
47d1ec61 1537 if (chan->fcs == L2CAP_FCS_CRC16)
fcc203c3
GP		 1538 hlen += 2;
1539
1c2acffb
GP		 1540 count = min_t(unsigned int, (conn->mtu - hlen), len);
1541 skb = bt_skb_send_alloc(sk, count + hlen,
1542 msg->msg_flags & MSG_DONTWAIT, &err);
1543 if (!skb)
0175d629 1544 return ERR_PTR(err);
1c2acffb
GP		 1545
1546 /* Create L2CAP header */
1547 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1548 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb
GP		 1549 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1550 put_unaligned_le16(control, skb_put(skb, 2));
c74e560c
GP		 1551 if (sdulen)
1552 put_unaligned_le16(sdulen, skb_put(skb, 2));
1c2acffb
GP		 1553
1554 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1555 if (unlikely(err < 0)) {
1556 kfree_skb(skb);
1557 return ERR_PTR(err);
1558 }
e90bac06 1559
47d1ec61 1560 if (chan->fcs == L2CAP_FCS_CRC16)
fcc203c3
GP		 1561 put_unaligned_le16(0, skb_put(skb, 2));
1562
e90bac06 1563 bt_cb(skb)->retries = 0;
1c2acffb 1564 return skb;
1da177e4
LT		 1565}
1566
2c03a7a4 1567int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
c74e560c 1568{
c74e560c
GP		 1569 struct sk_buff *skb;
1570 struct sk_buff_head sar_queue;
1571 u16 control;
1572 size_t size = 0;
1573
ff12fd64 1574 skb_queue_head_init(&sar_queue);
c74e560c 1575 control = L2CAP_SDU_START;
47d1ec61 1576 skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len);
c74e560c
GP		 1577 if (IS_ERR(skb))
1578 return PTR_ERR(skb);
1579
1580 __skb_queue_tail(&sar_queue, skb);
2c03a7a4
GP		 1581 len -= chan->remote_mps;
1582 size += chan->remote_mps;
c74e560c
GP		 1583
1584 while (len > 0) {
1585 size_t buflen;
1586
2c03a7a4 1587 if (len > chan->remote_mps) {
44651b85 1588 control = L2CAP_SDU_CONTINUE;
2c03a7a4 1589 buflen = chan->remote_mps;
c74e560c 1590 } else {
44651b85 1591 control = L2CAP_SDU_END;
c74e560c
GP		 1592 buflen = len;
1593 }
1594
47d1ec61 1595 skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0);
c74e560c
GP		 1596 if (IS_ERR(skb)) {
1597 skb_queue_purge(&sar_queue);
1598 return PTR_ERR(skb);
1599 }
1600
1601 __skb_queue_tail(&sar_queue, skb);
1602 len -= buflen;
1603 size += buflen;
c74e560c 1604 }
58d35f87
GP		 1605 skb_queue_splice_tail(&sar_queue, &chan->tx_q);
1606 if (chan->tx_send_head == NULL)
1607 chan->tx_send_head = sar_queue.next;
c74e560c
GP		 1608
1609 return size;
1610}
1611
9a91a04a
GP		 1612int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1613{
9a91a04a
GP		 1614 struct sk_buff *skb;
1615 u16 control;
1616 int err;
1617
1618 /* Connectionless channel */
715ec005 1619 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
9a91a04a
GP		 1620 skb = l2cap_create_connless_pdu(chan, msg, len);
1621 if (IS_ERR(skb))
1622 return PTR_ERR(skb);
1623
1624 l2cap_do_send(chan, skb);
1625 return len;
1626 }
1627
1628 switch (chan->mode) {
1629 case L2CAP_MODE_BASIC:
1630 /* Check outgoing MTU */
1631 if (len > chan->omtu)
1632 return -EMSGSIZE;
1633
1634 /* Create a basic PDU */
1635 skb = l2cap_create_basic_pdu(chan, msg, len);
1636 if (IS_ERR(skb))
1637 return PTR_ERR(skb);
1638
1639 l2cap_do_send(chan, skb);
1640 err = len;
1641 break;
1642
1643 case L2CAP_MODE_ERTM:
1644 case L2CAP_MODE_STREAMING:
1645 /* Entire SDU fits into one PDU */
1646 if (len <= chan->remote_mps) {
1647 control = L2CAP_SDU_UNSEGMENTED;
1648 skb = l2cap_create_iframe_pdu(chan, msg, len, control,
1649 0);
1650 if (IS_ERR(skb))
1651 return PTR_ERR(skb);
1652
1653 __skb_queue_tail(&chan->tx_q, skb);
1654
1655 if (chan->tx_send_head == NULL)
1656 chan->tx_send_head = skb;
1657
1658 } else {
1659 /* Segment SDU into multiples PDUs */
1660 err = l2cap_sar_segment_sdu(chan, msg, len);
1661 if (err < 0)
1662 return err;
1663 }
1664
1665 if (chan->mode == L2CAP_MODE_STREAMING) {
1666 l2cap_streaming_send(chan);
1667 err = len;
1668 break;
1669 }
1670
1671 if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
1672 (chan->conn_state & L2CAP_CONN_WAIT_F)) {
1673 err = len;
1674 break;
1675 }
1676
1677 err = l2cap_ertm_send(chan);
1678 if (err >= 0)
1679 err = len;
1680
1681 break;
1682
1683 default:
1684 BT_DBG("bad state %1.1x", chan->mode);
1685 err = -EBADFD;
1686 }
1687
1688 return err;
1689}
1690
1da177e4
LT		 1691/* Copy frame to all raw sockets on that connection */
1692static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
1693{
1da177e4 1694 struct sk_buff *nskb;
48454079 1695 struct l2cap_chan *chan;
1da177e4
LT		 1696
1697 BT_DBG("conn %p", conn);
1698
baa7e1fa
GP		 1699 read_lock(&conn->chan_lock);
1700 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 1701 struct sock *sk = chan->sk;
715ec005 1702 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 1703 continue;
1704
1705 /* Don't send frame to the socket it came from */
1706 if (skb->sk == sk)
1707 continue;
af05b30b
GP		 1708 nskb = skb_clone(skb, GFP_ATOMIC);
1709 if (!nskb)
1da177e4
LT		 1710 continue;
1711
23070494 1712 if (chan->ops->recv(chan->data, nskb))
1da177e4
LT		 1713 kfree_skb(nskb);
1714 }
baa7e1fa 1715 read_unlock(&conn->chan_lock);
1da177e4
LT		 1716}
1717
1718/* ---- L2CAP signalling commands ---- */
1719static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
1720 u8 code, u8 ident, u16 dlen, void *data)
1721{
1722 struct sk_buff *skb, **frag;
1723 struct l2cap_cmd_hdr *cmd;
1724 struct l2cap_hdr *lh;
1725 int len, count;
1726
af05b30b
GP		 1727 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
1728 conn, code, ident, dlen);
1da177e4
LT		 1729
1730 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
1731 count = min_t(unsigned int, conn->mtu, len);
1732
1733 skb = bt_skb_alloc(count, GFP_ATOMIC);
1734 if (!skb)
1735 return NULL;
1736
1737 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 1738 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 1739
1740 if (conn->hcon->type == LE_LINK)
1741 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
1742 else
1743 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 1744
1745 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
1746 cmd->code = code;
1747 cmd->ident = ident;
aca3192c 1748 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 1749
1750 if (dlen) {
1751 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
1752 memcpy(skb_put(skb, count), data, count);
1753 data += count;
1754 }
1755
1756 len -= skb->len;
1757
1758 /* Continuation fragments (no L2CAP header) */
1759 frag = &skb_shinfo(skb)->frag_list;
1760 while (len) {
1761 count = min_t(unsigned int, conn->mtu, len);
1762
1763 *frag = bt_skb_alloc(count, GFP_ATOMIC);
1764 if (!*frag)
1765 goto fail;
1766
1767 memcpy(skb_put(*frag, count), data, count);
1768
1769 len -= count;
1770 data += count;
1771
1772 frag = &(*frag)->next;
1773 }
1774
1775 return skb;
1776
1777fail:
1778 kfree_skb(skb);
1779 return NULL;
1780}
1781
1782static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
1783{
1784 struct l2cap_conf_opt *opt = *ptr;
1785 int len;
1786
1787 len = L2CAP_CONF_OPT_SIZE + opt->len;
1788 *ptr += len;
1789
1790 *type = opt->type;
1791 *olen = opt->len;
1792
1793 switch (opt->len) {
1794 case 1:
1795 *val = *((u8 *) opt->val);
1796 break;
1797
1798 case 2:
bfaaeb3e 1799 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 1800 break;
1801
1802 case 4:
bfaaeb3e 1803 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 1804 break;
1805
1806 default:
1807 *val = (unsigned long) opt->val;
1808 break;
1809 }
1810
1811 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
1812 return len;
1813}
1814
1da177e4
LT		 1815static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
1816{
1817 struct l2cap_conf_opt *opt = *ptr;
1818
1819 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
1820
1821 opt->type = type;
1822 opt->len = len;
1823
1824 switch (len) {
1825 case 1:
1826 *((u8 *) opt->val) = val;
1827 break;
1828
1829 case 2:
4f8b691c 1830 put_unaligned_le16(val, opt->val);
1da177e4
LT		 1831 break;
1832
1833 case 4:
4f8b691c 1834 put_unaligned_le32(val, opt->val);
1da177e4
LT		 1835 break;
1836
1837 default:
1838 memcpy(opt->val, (void *) val, len);
1839 break;
1840 }
1841
1842 *ptr += L2CAP_CONF_OPT_SIZE + len;
1843}
1844
c1b4f43b
GP		 1845static void l2cap_ack_timeout(unsigned long arg)
1846{
525cd185 1847 struct l2cap_chan *chan = (void *) arg;
c1b4f43b 1848
525cd185
GP		 1849 bh_lock_sock(chan->sk);
1850 l2cap_send_ack(chan);
1851 bh_unlock_sock(chan->sk);
c1b4f43b
GP		 1852}
1853
525cd185 1854static inline void l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 1855{
525cd185
GP		 1856 struct sock *sk = chan->sk;
1857
42e5c802 1858 chan->expected_ack_seq = 0;
6a026610 1859 chan->unacked_frames = 0;
42e5c802 1860 chan->buffer_seq = 0;
6a026610
GP		 1861 chan->num_acked = 0;
1862 chan->frames_sent = 0;
0565c1c2 1863
e92c8e70
GP		 1864 setup_timer(&chan->retrans_timer, l2cap_retrans_timeout,
1865 (unsigned long) chan);
1866 setup_timer(&chan->monitor_timer, l2cap_monitor_timeout,
1867 (unsigned long) chan);
1868 setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan);
0565c1c2 1869
f1c6775b
GP		 1870 skb_queue_head_init(&chan->srej_q);
1871 skb_queue_head_init(&chan->busy_q);
1890d36b 1872
39d5a3ee
GP		 1873 INIT_LIST_HEAD(&chan->srej_l);
1874
311bb895 1875 INIT_WORK(&chan->busy_work, l2cap_busy_work);
218bb9df
GP		 1876
1877 sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
0565c1c2
GP		 1878}
1879
f2fcfcd6
GP		 1880static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
1881{
1882 switch (mode) {
1883 case L2CAP_MODE_STREAMING:
1884 case L2CAP_MODE_ERTM:
1885 if (l2cap_mode_supported(mode, remote_feat_mask))
1886 return mode;
1887 /* fall through */
1888 default:
1889 return L2CAP_MODE_BASIC;
1890 }
1891}
1892
710f9b0a 1893static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 1894{
1da177e4 1895 struct l2cap_conf_req *req = data;
0c1bc5c6 1896 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4
LT		 1897 void *ptr = req->data;
1898
49208c9c 1899 BT_DBG("chan %p", chan);
1da177e4 1900
73ffa904 1901 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 1902 goto done;
1903
0c1bc5c6 1904 switch (chan->mode) {
f2fcfcd6
GP		 1905 case L2CAP_MODE_STREAMING:
1906 case L2CAP_MODE_ERTM:
b4450035 1907 if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE)
85eb53c6 1908 break;
85eb53c6 1909
2ba13ed6 1910 /* fall through */
f2fcfcd6 1911 default:
8c1d787b 1912 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 1913 break;
1914 }
1915
1916done:
0c1bc5c6
GP		 1917 if (chan->imtu != L2CAP_DEFAULT_MTU)
1918 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 1919
0c1bc5c6 1920 switch (chan->mode) {
65c7c491 1921 case L2CAP_MODE_BASIC:
8c1d787b
GP		 1922 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
1923 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 1924 break;
1925
62547752
GP		 1926 rfc.mode = L2CAP_MODE_BASIC;
1927 rfc.txwin_size = 0;
1928 rfc.max_transmit = 0;
1929 rfc.retrans_timeout = 0;
1930 rfc.monitor_timeout = 0;
1931 rfc.max_pdu_size = 0;
1932
63406504
GP		 1933 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1934 (unsigned long) &rfc);
65c7c491
MH		 1935 break;
1936
1937 case L2CAP_MODE_ERTM:
1938 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61
GP		 1939 rfc.txwin_size = chan->tx_win;
1940 rfc.max_transmit = chan->max_tx;
f2fcfcd6
GP		 1941 rfc.retrans_timeout = 0;
1942 rfc.monitor_timeout = 0;
c74e560c 1943 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
8c1d787b
GP		 1944 if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
1945 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
f2fcfcd6 1946
63406504
GP		 1947 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1948 (unsigned long) &rfc);
1949
8c1d787b 1950 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 1951 break;
1952
47d1ec61 1953 if (chan->fcs == L2CAP_FCS_NONE ||
b4450035 1954 chan->conf_state & L2CAP_CONF_NO_FCS_RECV) {
47d1ec61
GP		 1955 chan->fcs = L2CAP_FCS_NONE;
1956 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 1957 }
f2fcfcd6
GP		 1958 break;
1959
1960 case L2CAP_MODE_STREAMING:
1961 rfc.mode = L2CAP_MODE_STREAMING;
1962 rfc.txwin_size = 0;
1963 rfc.max_transmit = 0;
1964 rfc.retrans_timeout = 0;
1965 rfc.monitor_timeout = 0;
c74e560c 1966 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
8c1d787b
GP		 1967 if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
1968 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
65c7c491 1969
63406504
GP		 1970 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1971 (unsigned long) &rfc);
1972
8c1d787b 1973 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 1974 break;
1975
47d1ec61 1976 if (chan->fcs == L2CAP_FCS_NONE ||
b4450035 1977 chan->conf_state & L2CAP_CONF_NO_FCS_RECV) {
47d1ec61
GP		 1978 chan->fcs = L2CAP_FCS_NONE;
1979 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 1980 }
65c7c491
MH		 1981 break;
1982 }
1da177e4 1983
fe4128e0 1984 req->dcid = cpu_to_le16(chan->dcid);
aca3192c 1985 req->flags = cpu_to_le16(0);
1da177e4
LT		 1986
1987 return ptr - data;
1988}
1989
73ffa904 1990static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 1991{
5dee9e7c
MH		 1992 struct l2cap_conf_rsp *rsp = data;
1993 void *ptr = rsp->data;
73ffa904
GP		 1994 void *req = chan->conf_req;
1995 int len = chan->conf_len;
5dee9e7c
MH		 1996 int type, hint, olen;
1997 unsigned long val;
6464f35f 1998 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 1999 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2000 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2001
73ffa904 2002 BT_DBG("chan %p", chan);
820ae1b8 2003
5dee9e7c
MH		 2004 while (len >= L2CAP_CONF_OPT_SIZE) {
2005 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2006
589d2746 2007 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2008 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2009
2010 switch (type) {
2011 case L2CAP_CONF_MTU:
861d6882 2012 mtu = val;
5dee9e7c
MH		 2013 break;
2014
2015 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2016 chan->flush_to = val;
5dee9e7c
MH		 2017 break;
2018
2019 case L2CAP_CONF_QOS:
2020 break;
2021
6464f35f
MH		 2022 case L2CAP_CONF_RFC:
2023 if (olen == sizeof(rfc))
2024 memcpy(&rfc, (void *) val, olen);
2025 break;
2026
fcc203c3
GP		 2027 case L2CAP_CONF_FCS:
2028 if (val == L2CAP_FCS_NONE)
b4450035 2029 chan->conf_state |= L2CAP_CONF_NO_FCS_RECV;
fcc203c3
GP		 2030
2031 break;
2032
5dee9e7c
MH		 2033 default:
2034 if (hint)
2035 break;
2036
2037 result = L2CAP_CONF_UNKNOWN;
2038 *((u8 *) ptr++) = type;
2039 break;
2040 }
2041 }
2042
73ffa904 2043 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 2044 goto done;
2045
0c1bc5c6 2046 switch (chan->mode) {
f2fcfcd6
GP		 2047 case L2CAP_MODE_STREAMING:
2048 case L2CAP_MODE_ERTM:
b4450035 2049 if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
0c1bc5c6 2050 chan->mode = l2cap_select_mode(rfc.mode,
8c1d787b 2051 chan->conn->feat_mask);
85eb53c6
GP		 2052 break;
2053 }
2054
0c1bc5c6 2055 if (chan->mode != rfc.mode)
f2fcfcd6 2056 return -ECONNREFUSED;
742e519b 2057
f2fcfcd6 2058 break;
f2fcfcd6
GP		 2059 }
2060
2061done:
0c1bc5c6 2062 if (chan->mode != rfc.mode) {
f2fcfcd6 2063 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2064 rfc.mode = chan->mode;
f2fcfcd6 2065
73ffa904 2066 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 2067 return -ECONNREFUSED;
2068
2069 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2070 sizeof(rfc), (unsigned long) &rfc);
2071 }
2072
2073
5dee9e7c
MH		 2074 if (result == L2CAP_CONF_SUCCESS) {
2075 /* Configure output options and let the other side know
2076 * which ones we don't like. */
2077
f2fcfcd6
GP		 2078 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2079 result = L2CAP_CONF_UNACCEPT;
2080 else {
0c1bc5c6 2081 chan->omtu = mtu;
b4450035 2082 chan->conf_state |= L2CAP_CONF_MTU_DONE;
f2fcfcd6 2083 }
0c1bc5c6 2084 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 2085
f2fcfcd6
GP		 2086 switch (rfc.mode) {
2087 case L2CAP_MODE_BASIC:
47d1ec61 2088 chan->fcs = L2CAP_FCS_NONE;
b4450035 2089 chan->conf_state |= L2CAP_CONF_MODE_DONE;
f2fcfcd6
GP		 2090 break;
2091
2092 case L2CAP_MODE_ERTM:
2c03a7a4
GP		 2093 chan->remote_tx_win = rfc.txwin_size;
2094 chan->remote_max_tx = rfc.max_transmit;
86b1b263 2095
8c1d787b
GP		 2096 if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
2097 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1c762159 2098
2c03a7a4 2099 chan->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6 2100
10467e9e
GP		 2101 rfc.retrans_timeout =
2102 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2103 rfc.monitor_timeout =
2104 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6 2105
b4450035 2106 chan->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2107
2108 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2109 sizeof(rfc), (unsigned long) &rfc);
2110
f2fcfcd6
GP		 2111 break;
2112
2113 case L2CAP_MODE_STREAMING:
8c1d787b
GP		 2114 if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
2115 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1c762159 2116
2c03a7a4 2117 chan->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6 2118
b4450035 2119 chan->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2120
2121 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2122 sizeof(rfc), (unsigned long) &rfc);
2123
f2fcfcd6
GP		 2124 break;
2125
2126 default:
5dee9e7c 2127 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2128
6464f35f 2129 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 2130 rfc.mode = chan->mode;
f2fcfcd6 2131 }
6464f35f 2132
f2fcfcd6 2133 if (result == L2CAP_CONF_SUCCESS)
b4450035 2134 chan->conf_state |= L2CAP_CONF_OUTPUT_DONE;
f2fcfcd6 2135 }
fe4128e0 2136 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c
MH		 2137 rsp->result = cpu_to_le16(result);
2138 rsp->flags = cpu_to_le16(0x0000);
2139
2140 return ptr - data;
1da177e4
LT		 2141}
2142
b4450035 2143static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
f2fcfcd6 2144{
f2fcfcd6
GP		 2145 struct l2cap_conf_req *req = data;
2146 void *ptr = req->data;
2147 int type, olen;
2148 unsigned long val;
2149 struct l2cap_conf_rfc rfc;
2150
fe4128e0 2151 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 2152
2153 while (len >= L2CAP_CONF_OPT_SIZE) {
2154 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2155
2156 switch (type) {
2157 case L2CAP_CONF_MTU:
2158 if (val < L2CAP_DEFAULT_MIN_MTU) {
2159 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2160 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 2161 } else
0c1bc5c6
GP		 2162 chan->imtu = val;
2163 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 2164 break;
2165
2166 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2167 chan->flush_to = val;
f2fcfcd6 2168 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
0c1bc5c6 2169 2, chan->flush_to);
f2fcfcd6
GP		 2170 break;
2171
2172 case L2CAP_CONF_RFC:
2173 if (olen == sizeof(rfc))
2174 memcpy(&rfc, (void *)val, olen);
2175
b4450035 2176 if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
0c1bc5c6 2177 rfc.mode != chan->mode)
f2fcfcd6
GP		 2178 return -ECONNREFUSED;
2179
47d1ec61 2180 chan->fcs = 0;
f2fcfcd6
GP		 2181
2182 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2183 sizeof(rfc), (unsigned long) &rfc);
2184 break;
2185 }
2186 }
2187
0c1bc5c6 2188 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 2189 return -ECONNREFUSED;
2190
0c1bc5c6 2191 chan->mode = rfc.mode;
6c2ea7a8 2192
f2fcfcd6
GP		 2193 if (*result == L2CAP_CONF_SUCCESS) {
2194 switch (rfc.mode) {
2195 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2196 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2197 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2198 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2199 break;
2200 case L2CAP_MODE_STREAMING:
47d1ec61 2201 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2202 }
2203 }
2204
fe4128e0 2205 req->dcid = cpu_to_le16(chan->dcid);
f2fcfcd6
GP		 2206 req->flags = cpu_to_le16(0x0000);
2207
2208 return ptr - data;
2209}
2210
fe4128e0 2211static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1da177e4
LT		 2212{
2213 struct l2cap_conf_rsp *rsp = data;
2214 void *ptr = rsp->data;
1da177e4 2215
fe4128e0 2216 BT_DBG("chan %p", chan);
1da177e4 2217
fe4128e0 2218 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 2219 rsp->result = cpu_to_le16(result);
aca3192c 2220 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2221
2222 return ptr - data;
2223}
2224
8c1d787b 2225void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 2226{
2227 struct l2cap_conn_rsp rsp;
8c1d787b 2228 struct l2cap_conn *conn = chan->conn;
710f9b0a
GP		 2229 u8 buf[128];
2230
fe4128e0
GP		 2231 rsp.scid = cpu_to_le16(chan->dcid);
2232 rsp.dcid = cpu_to_le16(chan->scid);
710f9b0a
GP		 2233 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
2234 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
2235 l2cap_send_cmd(conn, chan->ident,
2236 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2237
b4450035 2238 if (chan->conf_state & L2CAP_CONF_REQ_SENT)
710f9b0a
GP		 2239 return;
2240
b4450035 2241 chan->conf_state |= L2CAP_CONF_REQ_SENT;
710f9b0a
GP		 2242 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2243 l2cap_build_conf_req(chan, buf), buf);
2244 chan->num_conf_req++;
2245}
2246
47d1ec61 2247static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 2248{
7b1c0049
GP		 2249 int type, olen;
2250 unsigned long val;
2251 struct l2cap_conf_rfc rfc;
2252
47d1ec61 2253 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 2254
0c1bc5c6 2255 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 2256 return;
2257
2258 while (len >= L2CAP_CONF_OPT_SIZE) {
2259 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2260
2261 switch (type) {
2262 case L2CAP_CONF_RFC:
2263 if (olen == sizeof(rfc))
2264 memcpy(&rfc, (void *)val, olen);
2265 goto done;
2266 }
2267 }
2268
2269done:
2270 switch (rfc.mode) {
2271 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2272 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2273 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2274 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2275 break;
2276 case L2CAP_MODE_STREAMING:
47d1ec61 2277 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2278 }
2279}
2280
4e8402a3
MH		 2281static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2282{
2283 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2284
2285 if (rej->reason != 0x0000)
2286 return 0;
2287
2288 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2289 cmd->ident == conn->info_ident) {
4e8402a3 2290 del_timer(&conn->info_timer);
984947dc
MH		 2291
2292 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2293 conn->info_ident = 0;
984947dc 2294
4e8402a3
MH		 2295 l2cap_conn_start(conn);
2296 }
2297
2298 return 0;
2299}
2300
1da177e4
LT		 2301static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2302{
1da177e4
LT		 2303 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2304 struct l2cap_conn_rsp rsp;
23691d75 2305 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 2306 struct sock *parent, *sk = NULL;
e7c29cb1 2307 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2308
2309 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2310 __le16 psm = req->psm;
1da177e4
LT		 2311
2312 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2313
2314 /* Check if we have socket listening on psm */
23691d75
GP		 2315 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src);
2316 if (!pchan) {
1da177e4
LT		 2317 result = L2CAP_CR_BAD_PSM;
2318 goto sendresp;
2319 }
2320
23691d75
GP		 2321 parent = pchan->sk;
2322
e0f0cb56
GP		 2323 bh_lock_sock(parent);
2324
e7c29cb1
MH		 2325 /* Check if the ACL is secure enough (if not SDP) */
2326 if (psm != cpu_to_le16(0x0001) &&
2327 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2328 conn->disc_reason = 0x05;
e7c29cb1
MH		 2329 result = L2CAP_CR_SEC_BLOCK;
2330 goto response;
2331 }
2332
1da177e4
LT		 2333 result = L2CAP_CR_NO_MEM;
2334
2335 /* Check for backlog size */
2336 if (sk_acceptq_is_full(parent)) {
8e87d142 2337 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2338 goto response;
2339 }
2340
80808e43
GP		 2341 chan = pchan->ops->new_connection(pchan->data);
2342 if (!chan)
1da177e4
LT		 2343 goto response;
2344
80808e43
GP		 2345 sk = chan->sk;
2346
baa7e1fa 2347 write_lock_bh(&conn->chan_lock);
1da177e4
LT		 2348
2349 /* Check if we already have channel with that dcid */
baa7e1fa
GP		 2350 if (__l2cap_get_chan_by_dcid(conn, scid)) {
2351 write_unlock_bh(&conn->chan_lock);
1da177e4 2352 sock_set_flag(sk, SOCK_ZAPPED);
ba3bd0ee 2353 chan->ops->close(chan->data);
1da177e4
LT		 2354 goto response;
2355 }
2356
2357 hci_conn_hold(conn->hcon);
2358
1da177e4
LT		 2359 bacpy(&bt_sk(sk)->src, conn->src);
2360 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 2361 chan->psm = psm;
2362 chan->dcid = scid;
1da177e4 2363
d1010240
GP		 2364 bt_accept_enqueue(parent, sk);
2365
48454079
GP		 2366 __l2cap_chan_add(conn, chan);
2367
fe4128e0 2368 dcid = chan->scid;
1da177e4 2369
c9b66675 2370 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 2371
fc7f8a7e 2372 chan->ident = cmd->ident;
1da177e4 2373
984947dc 2374 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
4343478f 2375 if (l2cap_check_security(chan)) {
f66dc81f 2376 if (bt_sk(sk)->defer_setup) {
89bc500e 2377 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 2378 result = L2CAP_CR_PEND;
2379 status = L2CAP_CS_AUTHOR_PEND;
2380 parent->sk_data_ready(parent, 0);
2381 } else {
89bc500e 2382 l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 2383 result = L2CAP_CR_SUCCESS;
2384 status = L2CAP_CS_NO_INFO;
2385 }
79d554a6 2386 } else {
89bc500e 2387 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 2388 result = L2CAP_CR_PEND;
2389 status = L2CAP_CS_AUTHEN_PEND;
2390 }
2391 } else {
89bc500e 2392 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 2393 result = L2CAP_CR_PEND;
2394 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2395 }
2396
baa7e1fa 2397 write_unlock_bh(&conn->chan_lock);
1da177e4
LT		 2398
2399response:
2400 bh_unlock_sock(parent);
2401
2402sendresp:
aca3192c
YH		 2403 rsp.scid = cpu_to_le16(scid);
2404 rsp.dcid = cpu_to_le16(dcid);
2405 rsp.result = cpu_to_le16(result);
2406 rsp.status = cpu_to_le16(status);
1da177e4 2407 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2408
2409 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2410 struct l2cap_info_req info;
2411 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2412
2413 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2414 conn->info_ident = l2cap_get_ident(conn);
2415
2416 mod_timer(&conn->info_timer, jiffies +
2417 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2418
2419 l2cap_send_cmd(conn, conn->info_ident,
2420 L2CAP_INFO_REQ, sizeof(info), &info);
2421 }
2422
b4450035 2423 if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) &&
e9aeb2dd
GP		 2424 result == L2CAP_CR_SUCCESS) {
2425 u8 buf[128];
b4450035 2426 chan->conf_state |= L2CAP_CONF_REQ_SENT;
e9aeb2dd 2427 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2428 l2cap_build_conf_req(chan, buf), buf);
2429 chan->num_conf_req++;
e9aeb2dd
GP		 2430 }
2431
1da177e4
LT		 2432 return 0;
2433}
2434
2435static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2436{
2437 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2438 u16 scid, dcid, result, status;
48454079 2439 struct l2cap_chan *chan;
1da177e4
LT		 2440 struct sock *sk;
2441 u8 req[128];
2442
2443 scid = __le16_to_cpu(rsp->scid);
2444 dcid = __le16_to_cpu(rsp->dcid);
2445 result = __le16_to_cpu(rsp->result);
2446 status = __le16_to_cpu(rsp->status);
2447
2448 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2449
2450 if (scid) {
baa7e1fa 2451 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2452 if (!chan)
57d3b22b 2453 return -EFAULT;
1da177e4 2454 } else {
baa7e1fa 2455 chan = l2cap_get_chan_by_ident(conn, cmd->ident);
48454079 2456 if (!chan)
57d3b22b 2457 return -EFAULT;
1da177e4
LT		 2458 }
2459
48454079
GP		 2460 sk = chan->sk;
2461
1da177e4
LT		 2462 switch (result) {
2463 case L2CAP_CR_SUCCESS:
89bc500e 2464 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 2465 chan->ident = 0;
fe4128e0 2466 chan->dcid = dcid;
b4450035 2467 chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
6a8d3010 2468
b4450035 2469 if (chan->conf_state & L2CAP_CONF_REQ_SENT)
e9aeb2dd
GP		 2470 break;
2471
b4450035 2472 chan->conf_state |= L2CAP_CONF_REQ_SENT;
e9aeb2dd 2473
1da177e4 2474 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2475 l2cap_build_conf_req(chan, req), req);
2476 chan->num_conf_req++;
1da177e4
LT		 2477 break;
2478
2479 case L2CAP_CR_PEND:
b4450035 2480 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 2481 break;
2482
2483 default:
a49184c2
AE		 2484 /* don't delete l2cap channel if sk is owned by user */
2485 if (sock_owned_by_user(sk)) {
89bc500e 2486 l2cap_state_change(chan, BT_DISCONN);
c9b66675
GP		 2487 __clear_chan_timer(chan);
2488 __set_chan_timer(chan, HZ / 5);
a49184c2
AE		 2489 break;
2490 }
2491
48454079 2492 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 2493 break;
2494 }
2495
2496 bh_unlock_sock(sk);
2497 return 0;
2498}
2499
47d1ec61 2500static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60 2501{
47d1ec61
GP		 2502 struct l2cap_pinfo *pi = l2cap_pi(chan->sk);
2503
8c462b60
MM		 2504 /* FCS is enabled only in ERTM or streaming mode, if one or both
2505 * sides request it.
2506 */
0c1bc5c6 2507 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 2508 chan->fcs = L2CAP_FCS_NONE;
b4450035 2509 else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV))
47d1ec61 2510 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 2511}
2512
88219a0f 2513static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 2514{
2515 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2516 u16 dcid, flags;
2517 u8 rsp[64];
48454079 2518 struct l2cap_chan *chan;
1da177e4 2519 struct sock *sk;
5dee9e7c 2520 int len;
1da177e4
LT		 2521
2522 dcid = __le16_to_cpu(req->dcid);
2523 flags = __le16_to_cpu(req->flags);
2524
2525 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2526
baa7e1fa 2527 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 2528 if (!chan)
1da177e4
LT		 2529 return -ENOENT;
2530
48454079
GP		 2531 sk = chan->sk;
2532
89bc500e 2533 if (chan->state != BT_CONFIG) {
df6bd743
GP		 2534 struct l2cap_cmd_rej rej;
2535
2536 rej.reason = cpu_to_le16(0x0002);
2537 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2538 sizeof(rej), &rej);
354f60a9 2539 goto unlock;
df6bd743 2540 }
354f60a9 2541
5dee9e7c 2542 /* Reject if config buffer is too small. */
88219a0f 2543 len = cmd_len - sizeof(*req);
73ffa904 2544 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 2545 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 2546 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c
MH		 2547 L2CAP_CONF_REJECT, flags), rsp);
2548 goto unlock;
2549 }
2550
2551 /* Store config. */
73ffa904
GP		 2552 memcpy(chan->conf_req + chan->conf_len, req->data, len);
2553 chan->conf_len += len;
1da177e4
LT		 2554
2555 if (flags & 0x0001) {
2556 /* Incomplete config. Send empty response. */
2557 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 2558 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c 2559 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 2560 goto unlock;
2561 }
2562
2563 /* Complete config. */
73ffa904 2564 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 2565 if (len < 0) {
e92c8e70 2566 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 2567 goto unlock;
f2fcfcd6 2568 }
1da177e4 2569
5dee9e7c 2570 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 2571 chan->num_conf_rsp++;
5dee9e7c 2572
5dee9e7c 2573 /* Reset config buffer. */
73ffa904 2574 chan->conf_len = 0;
5dee9e7c 2575
b4450035 2576 if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE))
876d9484
MH		 2577 goto unlock;
2578
b4450035 2579 if (chan->conf_state & L2CAP_CONF_INPUT_DONE) {
47d1ec61 2580 set_default_fcs(chan);
fcc203c3 2581
89bc500e 2582 l2cap_state_change(chan, BT_CONNECTED);
e90bac06 2583
42e5c802
GP		 2584 chan->next_tx_seq = 0;
2585 chan->expected_tx_seq = 0;
58d35f87 2586 skb_queue_head_init(&chan->tx_q);
0c1bc5c6 2587 if (chan->mode == L2CAP_MODE_ERTM)
525cd185 2588 l2cap_ertm_init(chan);
0565c1c2 2589
1da177e4 2590 l2cap_chan_ready(sk);
876d9484
MH		 2591 goto unlock;
2592 }
2593
b4450035 2594 if (!(chan->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 2595 u8 buf[64];
b4450035 2596 chan->conf_state |= L2CAP_CONF_REQ_SENT;
1da177e4 2597 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2598 l2cap_build_conf_req(chan, buf), buf);
2599 chan->num_conf_req++;
1da177e4
LT		 2600 }
2601
2602unlock:
2603 bh_unlock_sock(sk);
2604 return 0;
2605}
2606
2607static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2608{
2609 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2610 u16 scid, flags, result;
48454079 2611 struct l2cap_chan *chan;
1da177e4 2612 struct sock *sk;
7b1c0049 2613 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 2614
2615 scid = __le16_to_cpu(rsp->scid);
2616 flags = __le16_to_cpu(rsp->flags);
2617 result = __le16_to_cpu(rsp->result);
2618
af05b30b
GP		 2619 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2620 scid, flags, result);
1da177e4 2621
baa7e1fa 2622 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2623 if (!chan)
1da177e4
LT		 2624 return 0;
2625
48454079
GP		 2626 sk = chan->sk;
2627
1da177e4
LT		 2628 switch (result) {
2629 case L2CAP_CONF_SUCCESS:
47d1ec61 2630 l2cap_conf_rfc_get(chan, rsp->data, len);
1da177e4
LT		 2631 break;
2632
2633 case L2CAP_CONF_UNACCEPT:
73ffa904 2634 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 2635 char req[64];
2636
c2c77ec8 2637 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 2638 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 2639 goto done;
2640 }
2641
f2fcfcd6
GP		 2642 /* throw out any old stored conf requests */
2643 result = L2CAP_CONF_SUCCESS;
b4450035
GP		 2644 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2645 req, &result);
f2fcfcd6 2646 if (len < 0) {
e92c8e70 2647 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 2648 goto done;
2649 }
2650
2651 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2652 L2CAP_CONF_REQ, len, req);
73ffa904 2653 chan->num_conf_req++;
f2fcfcd6
GP		 2654 if (result != L2CAP_CONF_SUCCESS)
2655 goto done;
2656 break;
1da177e4
LT		 2657 }
2658
8e87d142 2659 default:
b1235d79 2660 sk->sk_err = ECONNRESET;
c9b66675 2661 __set_chan_timer(chan, HZ * 5);
e92c8e70 2662 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 2663 goto done;
2664 }
2665
2666 if (flags & 0x01)
2667 goto done;
2668
b4450035 2669 chan->conf_state |= L2CAP_CONF_INPUT_DONE;
1da177e4 2670
b4450035 2671 if (chan->conf_state & L2CAP_CONF_OUTPUT_DONE) {
47d1ec61 2672 set_default_fcs(chan);
fcc203c3 2673
89bc500e 2674 l2cap_state_change(chan, BT_CONNECTED);
42e5c802
GP		 2675 chan->next_tx_seq = 0;
2676 chan->expected_tx_seq = 0;
58d35f87 2677 skb_queue_head_init(&chan->tx_q);
0c1bc5c6 2678 if (chan->mode == L2CAP_MODE_ERTM)
525cd185 2679 l2cap_ertm_init(chan);
0565c1c2 2680
1da177e4
LT		 2681 l2cap_chan_ready(sk);
2682 }
2683
2684done:
2685 bh_unlock_sock(sk);
2686 return 0;
2687}
2688
2689static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2690{
2691 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
2692 struct l2cap_disconn_rsp rsp;
2693 u16 dcid, scid;
48454079 2694 struct l2cap_chan *chan;
1da177e4
LT		 2695 struct sock *sk;
2696
2697 scid = __le16_to_cpu(req->scid);
2698 dcid = __le16_to_cpu(req->dcid);
2699
2700 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
2701
baa7e1fa 2702 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 2703 if (!chan)
1da177e4
LT		 2704 return 0;
2705
48454079
GP		 2706 sk = chan->sk;
2707
fe4128e0
GP		 2708 rsp.dcid = cpu_to_le16(chan->scid);
2709 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 2710 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
2711
2712 sk->sk_shutdown = SHUTDOWN_MASK;
2713
a49184c2
AE		 2714 /* don't delete l2cap channel if sk is owned by user */
2715 if (sock_owned_by_user(sk)) {
89bc500e 2716 l2cap_state_change(chan, BT_DISCONN);
c9b66675
GP		 2717 __clear_chan_timer(chan);
2718 __set_chan_timer(chan, HZ / 5);
a49184c2
AE		 2719 bh_unlock_sock(sk);
2720 return 0;
2721 }
2722
48454079 2723 l2cap_chan_del(chan, ECONNRESET);
1da177e4
LT		 2724 bh_unlock_sock(sk);
2725
ba3bd0ee 2726 chan->ops->close(chan->data);
1da177e4
LT		 2727 return 0;
2728}
2729
2730static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2731{
2732 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
2733 u16 dcid, scid;
48454079 2734 struct l2cap_chan *chan;
1da177e4
LT		 2735 struct sock *sk;
2736
2737 scid = __le16_to_cpu(rsp->scid);
2738 dcid = __le16_to_cpu(rsp->dcid);
2739
2740 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
2741
baa7e1fa 2742 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2743 if (!chan)
1da177e4
LT		 2744 return 0;
2745
48454079
GP		 2746 sk = chan->sk;
2747
a49184c2
AE		 2748 /* don't delete l2cap channel if sk is owned by user */
2749 if (sock_owned_by_user(sk)) {
89bc500e 2750 l2cap_state_change(chan,BT_DISCONN);
c9b66675
GP		 2751 __clear_chan_timer(chan);
2752 __set_chan_timer(chan, HZ / 5);
a49184c2
AE		 2753 bh_unlock_sock(sk);
2754 return 0;
2755 }
2756
48454079 2757 l2cap_chan_del(chan, 0);
1da177e4
LT		 2758 bh_unlock_sock(sk);
2759
ba3bd0ee 2760 chan->ops->close(chan->data);
1da177e4
LT		 2761 return 0;
2762}
2763
2764static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2765{
2766 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 2767 u16 type;
2768
2769 type = __le16_to_cpu(req->type);
2770
2771 BT_DBG("type 0x%4.4x", type);
2772
f0709e03
MH		 2773 if (type == L2CAP_IT_FEAT_MASK) {
2774 u8 buf[8];
44dd46de 2775 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 2776 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
2777 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2778 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 2779 if (!disable_ertm)
fcc203c3
GP		 2780 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2781 | L2CAP_FEAT_FCS;
1b7bf4ed 2782 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 2783 l2cap_send_cmd(conn, cmd->ident,
2784 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 2785 } else if (type == L2CAP_IT_FIXED_CHAN) {
2786 u8 buf[12];
2787 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
2788 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
2789 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
2790 memcpy(buf + 4, l2cap_fixed_chan, 8);
2791 l2cap_send_cmd(conn, cmd->ident,
2792 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 2793 } else {
2794 struct l2cap_info_rsp rsp;
2795 rsp.type = cpu_to_le16(type);
2796 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2797 l2cap_send_cmd(conn, cmd->ident,
2798 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
2799 }
1da177e4
LT		 2800
2801 return 0;
2802}
2803
2804static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2805{
2806 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
2807 u16 type, result;
2808
2809 type = __le16_to_cpu(rsp->type);
2810 result = __le16_to_cpu(rsp->result);
2811
2812 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
2813
e90165be
AE		 2814 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
2815 if (cmd->ident != conn->info_ident ||
2816 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
2817 return 0;
2818
4e8402a3
MH		 2819 del_timer(&conn->info_timer);
2820
adb08ede
VT		 2821 if (result != L2CAP_IR_SUCCESS) {
2822 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2823 conn->info_ident = 0;
2824
2825 l2cap_conn_start(conn);
2826
2827 return 0;
2828 }
2829
984947dc 2830 if (type == L2CAP_IT_FEAT_MASK) {
83985319 2831 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 2832
47ec1dcd 2833 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 2834 struct l2cap_info_req req;
2835 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
2836
2837 conn->info_ident = l2cap_get_ident(conn);
2838
2839 l2cap_send_cmd(conn, conn->info_ident,
2840 L2CAP_INFO_REQ, sizeof(req), &req);
2841 } else {
2842 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2843 conn->info_ident = 0;
2844
2845 l2cap_conn_start(conn);
2846 }
2847 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 2848 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2849 conn->info_ident = 0;
984947dc
MH		 2850
2851 l2cap_conn_start(conn);
2852 }
4e8402a3 2853
1da177e4
LT		 2854 return 0;
2855}
2856
e2174ca4 2857static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
de73115a
CT		 2858 u16 to_multiplier)
2859{
2860 u16 max_latency;
2861
2862 if (min > max || min < 6 || max > 3200)
2863 return -EINVAL;
2864
2865 if (to_multiplier < 10 || to_multiplier > 3200)
2866 return -EINVAL;
2867
2868 if (max >= to_multiplier * 8)
2869 return -EINVAL;
2870
2871 max_latency = (to_multiplier * 8 / max) - 1;
2872 if (latency > 499 || latency > max_latency)
2873 return -EINVAL;
2874
2875 return 0;
2876}
2877
2878static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2879 struct l2cap_cmd_hdr *cmd, u8 *data)
2880{
2881 struct hci_conn *hcon = conn->hcon;
2882 struct l2cap_conn_param_update_req *req;
2883 struct l2cap_conn_param_update_rsp rsp;
2884 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 2885 int err;
de73115a
CT		 2886
2887 if (!(hcon->link_mode & HCI_LM_MASTER))
2888 return -EINVAL;
2889
2890 cmd_len = __le16_to_cpu(cmd->len);
2891 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
2892 return -EPROTO;
2893
2894 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 2895 min = __le16_to_cpu(req->min);
2896 max = __le16_to_cpu(req->max);
de73115a
CT		 2897 latency = __le16_to_cpu(req->latency);
2898 to_multiplier = __le16_to_cpu(req->to_multiplier);
2899
2900 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2901 min, max, latency, to_multiplier);
2902
2903 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 2904
2905 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
2906 if (err)
de73115a
CT		 2907 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
2908 else
2909 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
2910
2911 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2912 sizeof(rsp), &rsp);
2913
2ce603eb
CT		 2914 if (!err)
2915 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
2916
de73115a
CT		 2917 return 0;
2918}
2919
3300d9a9
CT		 2920static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2921 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
2922{
2923 int err = 0;
2924
2925 switch (cmd->code) {
2926 case L2CAP_COMMAND_REJ:
2927 l2cap_command_rej(conn, cmd, data);
2928 break;
2929
2930 case L2CAP_CONN_REQ:
2931 err = l2cap_connect_req(conn, cmd, data);
2932 break;
2933
2934 case L2CAP_CONN_RSP:
2935 err = l2cap_connect_rsp(conn, cmd, data);
2936 break;
2937
2938 case L2CAP_CONF_REQ:
2939 err = l2cap_config_req(conn, cmd, cmd_len, data);
2940 break;
2941
2942 case L2CAP_CONF_RSP:
2943 err = l2cap_config_rsp(conn, cmd, data);
2944 break;
2945
2946 case L2CAP_DISCONN_REQ:
2947 err = l2cap_disconnect_req(conn, cmd, data);
2948 break;
2949
2950 case L2CAP_DISCONN_RSP:
2951 err = l2cap_disconnect_rsp(conn, cmd, data);
2952 break;
2953
2954 case L2CAP_ECHO_REQ:
2955 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
2956 break;
2957
2958 case L2CAP_ECHO_RSP:
2959 break;
2960
2961 case L2CAP_INFO_REQ:
2962 err = l2cap_information_req(conn, cmd, data);
2963 break;
2964
2965 case L2CAP_INFO_RSP:
2966 err = l2cap_information_rsp(conn, cmd, data);
2967 break;
2968
2969 default:
2970 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
2971 err = -EINVAL;
2972 break;
2973 }
2974
2975 return err;
2976}
2977
2978static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2979 struct l2cap_cmd_hdr *cmd, u8 *data)
2980{
2981 switch (cmd->code) {
2982 case L2CAP_COMMAND_REJ:
2983 return 0;
2984
2985 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 2986 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 2987
2988 case L2CAP_CONN_PARAM_UPDATE_RSP:
2989 return 0;
2990
2991 default:
2992 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
2993 return -EINVAL;
2994 }
2995}
2996
2997static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2998 struct sk_buff *skb)
1da177e4
LT		 2999{
3000 u8 *data = skb->data;
3001 int len = skb->len;
3002 struct l2cap_cmd_hdr cmd;
3300d9a9 3003 int err;
1da177e4
LT		 3004
3005 l2cap_raw_recv(conn, skb);
3006
3007 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3008 u16 cmd_len;
1da177e4
LT		 3009 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3010 data += L2CAP_CMD_HDR_SIZE;
3011 len -= L2CAP_CMD_HDR_SIZE;
3012
88219a0f 3013 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3014
88219a0f 3015 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3016
88219a0f 3017 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3018 BT_DBG("corrupted command");
3019 break;
3020 }
3021
3300d9a9
CT		 3022 if (conn->hcon->type == LE_LINK)
3023 err = l2cap_le_sig_cmd(conn, &cmd, data);
3024 else
3025 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 3026
3027 if (err) {
3028 struct l2cap_cmd_rej rej;
2c6d1a2e
GP		 3029
3030 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 3031
3032 /* FIXME: Map err to a valid reason */
aca3192c 3033 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3034 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3035 }
3036
88219a0f
AV		 3037 data += cmd_len;
3038 len -= cmd_len;
1da177e4
LT		 3039 }
3040
3041 kfree_skb(skb);
3042}
3043
47d1ec61 3044static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 3045{
3046 u16 our_fcs, rcv_fcs;
3047 int hdr_size = L2CAP_HDR_SIZE + 2;
3048
47d1ec61 3049 if (chan->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 3050 skb_trim(skb, skb->len - 2);
3051 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3052 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3053
3054 if (our_fcs != rcv_fcs)
7a560e5c 3055 return -EBADMSG;
fcc203c3
GP		 3056 }
3057 return 0;
3058}
3059
525cd185 3060static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 3061{
d5392c8f
GP		 3062 u16 control = 0;
3063
6a026610 3064 chan->frames_sent = 0;
d5392c8f 3065
42e5c802 3066 control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
d5392c8f 3067
525cd185 3068 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
64988868 3069 control |= L2CAP_SUPER_RCV_NOT_READY;
525cd185
GP		 3070 l2cap_send_sframe(chan, control);
3071 chan->conn_state |= L2CAP_CONN_RNR_SENT;
d5392c8f
GP		 3072 }
3073
525cd185
GP		 3074 if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY)
3075 l2cap_retransmit_frames(chan);
d5392c8f 3076
525cd185 3077 l2cap_ertm_send(chan);
d5392c8f 3078
525cd185 3079 if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
6a026610 3080 chan->frames_sent == 0) {
d5392c8f 3081 control |= L2CAP_SUPER_RCV_READY;
525cd185 3082 l2cap_send_sframe(chan, control);
d5392c8f
GP		 3083 }
3084}
3085
42e5c802 3086static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar)
8f17154f
GP		 3087{
3088 struct sk_buff *next_skb;
bfbacc11 3089 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3090
3091 bt_cb(skb)->tx_seq = tx_seq;
3092 bt_cb(skb)->sar = sar;
3093
f1c6775b 3094 next_skb = skb_peek(&chan->srej_q);
8f17154f 3095 if (!next_skb) {
f1c6775b 3096 __skb_queue_tail(&chan->srej_q, skb);
9b53350d 3097 return 0;
8f17154f
GP		 3098 }
3099
42e5c802 3100 tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
bfbacc11
JPRV		 3101 if (tx_seq_offset < 0)
3102 tx_seq_offset += 64;
3103
8f17154f 3104 do {
9b53350d
JPRV		 3105 if (bt_cb(next_skb)->tx_seq == tx_seq)
3106 return -EINVAL;
3107
bfbacc11 3108 next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
42e5c802 3109 chan->buffer_seq) % 64;
bfbacc11
JPRV		 3110 if (next_tx_seq_offset < 0)
3111 next_tx_seq_offset += 64;
3112
3113 if (next_tx_seq_offset > tx_seq_offset) {
f1c6775b 3114 __skb_queue_before(&chan->srej_q, next_skb, skb);
9b53350d 3115 return 0;
8f17154f
GP		 3116 }
3117
f1c6775b 3118 if (skb_queue_is_last(&chan->srej_q, next_skb))
8f17154f
GP		 3119 break;
3120
f1c6775b 3121 } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb)));
8f17154f 3122
f1c6775b 3123 __skb_queue_tail(&chan->srej_q, skb);
9b53350d
JPRV		 3124
3125 return 0;
8f17154f
GP		 3126}
3127
525cd185 3128static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control)
18778a63 3129{
18778a63 3130 struct sk_buff *_skb;
1890d36b 3131 int err;
18778a63
GP		 3132
3133 switch (control & L2CAP_CTRL_SAR) {
3134 case L2CAP_SDU_UNSEGMENTED:
525cd185 3135 if (chan->conn_state & L2CAP_CONN_SAR_SDU)
18778a63
GP		 3136 goto drop;
3137
23070494 3138 return chan->ops->recv(chan->data, skb);
18778a63
GP		 3139
3140 case L2CAP_SDU_START:
525cd185 3141 if (chan->conn_state & L2CAP_CONN_SAR_SDU)
18778a63
GP		 3142 goto drop;
3143
6f61fd47 3144 chan->sdu_len = get_unaligned_le16(skb->data);
18778a63 3145
0c1bc5c6 3146 if (chan->sdu_len > chan->imtu)
18778a63
GP		 3147 goto disconnect;
3148
6f61fd47
GP		 3149 chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC);
3150 if (!chan->sdu)
1890d36b
GP		 3151 return -ENOMEM;
3152
3153 /* pull sdu_len bytes only after alloc, because of Local Busy
3154 * condition we have to be sure that this will be executed
3155 * only once, i.e., when alloc does not fail */
3156 skb_pull(skb, 2);
18778a63 3157
6f61fd47 3158 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
18778a63 3159
525cd185 3160 chan->conn_state |= L2CAP_CONN_SAR_SDU;
6f61fd47 3161 chan->partial_sdu_len = skb->len;
18778a63
GP		 3162 break;
3163
3164 case L2CAP_SDU_CONTINUE:
525cd185 3165 if (!(chan->conn_state & L2CAP_CONN_SAR_SDU))
18778a63
GP		 3166 goto disconnect;
3167
6f61fd47 3168 if (!chan->sdu)
18778a63
GP		 3169 goto disconnect;
3170
6f61fd47
GP		 3171 chan->partial_sdu_len += skb->len;
3172 if (chan->partial_sdu_len > chan->sdu_len)
18778a63
GP		 3173 goto drop;
3174
6f61fd47 3175 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
4178ba46 3176
18778a63
GP		 3177 break;
3178
3179 case L2CAP_SDU_END:
525cd185 3180 if (!(chan->conn_state & L2CAP_CONN_SAR_SDU))
18778a63
GP		 3181 goto disconnect;
3182
6f61fd47 3183 if (!chan->sdu)
18778a63
GP		 3184 goto disconnect;
3185
525cd185 3186 if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) {
6f61fd47 3187 chan->partial_sdu_len += skb->len;
18778a63 3188
0c1bc5c6 3189 if (chan->partial_sdu_len > chan->imtu)
1890d36b 3190 goto drop;
18778a63 3191
6f61fd47 3192 if (chan->partial_sdu_len != chan->sdu_len)
1890d36b 3193 goto drop;
4178ba46 3194
6f61fd47 3195 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
1890d36b 3196 }
18778a63 3197
6f61fd47 3198 _skb = skb_clone(chan->sdu, GFP_ATOMIC);
1890d36b 3199 if (!_skb) {
525cd185 3200 chan->conn_state |= L2CAP_CONN_SAR_RETRY;
1890d36b
GP		 3201 return -ENOMEM;
3202 }
3203
23070494 3204 err = chan->ops->recv(chan->data, _skb);
1890d36b 3205 if (err < 0) {
18778a63 3206 kfree_skb(_skb);
525cd185 3207 chan->conn_state |= L2CAP_CONN_SAR_RETRY;
1890d36b
GP		 3208 return err;
3209 }
3210
525cd185
GP		 3211 chan->conn_state &= ~L2CAP_CONN_SAR_RETRY;
3212 chan->conn_state &= ~L2CAP_CONN_SAR_SDU;
18778a63 3213
6f61fd47 3214 kfree_skb(chan->sdu);
18778a63
GP		 3215 break;
3216 }
3217
3218 kfree_skb(skb);
1890d36b 3219 return 0;
18778a63
GP		 3220
3221drop:
6f61fd47
GP		 3222 kfree_skb(chan->sdu);
3223 chan->sdu = NULL;
18778a63
GP		 3224
3225disconnect:
8c1d787b 3226 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
18778a63
GP		 3227 kfree_skb(skb);
3228 return 0;
3229}
3230
525cd185 3231static int l2cap_try_push_rx_skb(struct l2cap_chan *chan)
712132eb 3232{
712132eb
GP		 3233 struct sk_buff *skb;
3234 u16 control;
3235 int err;
3236
f1c6775b 3237 while ((skb = skb_dequeue(&chan->busy_q))) {
712132eb 3238 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
525cd185 3239 err = l2cap_ertm_reassembly_sdu(chan, skb, control);
712132eb 3240 if (err < 0) {
f1c6775b 3241 skb_queue_head(&chan->busy_q, skb);
712132eb
GP		 3242 return -EBUSY;
3243 }
3244
42e5c802 3245 chan->buffer_seq = (chan->buffer_seq + 1) % 64;
712132eb
GP		 3246 }
3247
525cd185 3248 if (!(chan->conn_state & L2CAP_CONN_RNR_SENT))
712132eb
GP		 3249 goto done;
3250
42e5c802 3251 control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
712132eb 3252 control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
525cd185 3253 l2cap_send_sframe(chan, control);
6a026610 3254 chan->retry_count = 1;
712132eb 3255
1a09bcb9
GP		 3256 __clear_retrans_timer(chan);
3257 __set_monitor_timer(chan);
712132eb 3258
525cd185 3259 chan->conn_state |= L2CAP_CONN_WAIT_F;
712132eb
GP		 3260
3261done:
525cd185
GP		 3262 chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
3263 chan->conn_state &= ~L2CAP_CONN_RNR_SENT;
712132eb 3264
49208c9c 3265 BT_DBG("chan %p, Exit local busy", chan);
712132eb
GP		 3266
3267 return 0;
3268}
3269
1890d36b
GP		 3270static void l2cap_busy_work(struct work_struct *work)
3271{
3272 DECLARE_WAITQUEUE(wait, current);
311bb895
GP		 3273 struct l2cap_chan *chan =
3274 container_of(work, struct l2cap_chan, busy_work);
3275 struct sock *sk = chan->sk;
1890d36b
GP		 3276 int n_tries = 0, timeo = HZ/5, err;
3277 struct sk_buff *skb;
1890d36b
GP		 3278
3279 lock_sock(sk);
3280
2b0b05dd 3281 add_wait_queue(sk_sleep(sk), &wait);
311bb895 3282 while ((skb = skb_peek(&chan->busy_q))) {
1890d36b
GP		 3283 set_current_state(TASK_INTERRUPTIBLE);
3284
3285 if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
3286 err = -EBUSY;
8c1d787b 3287 l2cap_send_disconn_req(chan->conn, chan, EBUSY);
712132eb 3288 break;
1890d36b
GP		 3289 }
3290
3291 if (!timeo)
3292 timeo = HZ/5;
3293
3294 if (signal_pending(current)) {
3295 err = sock_intr_errno(timeo);
712132eb 3296 break;
1890d36b
GP		 3297 }
3298
3299 release_sock(sk);
3300 timeo = schedule_timeout(timeo);
3301 lock_sock(sk);
3302
3303 err = sock_error(sk);
3304 if (err)
712132eb 3305 break;
1890d36b 3306
311bb895 3307 if (l2cap_try_push_rx_skb(chan) == 0)
1890d36b
GP		 3308 break;
3309 }
3310
1890d36b 3311 set_current_state(TASK_RUNNING);
2b0b05dd 3312 remove_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3313
3314 release_sock(sk);
3315}
3316
525cd185 3317static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control)
1890d36b 3318{
1890d36b
GP		 3319 int sctrl, err;
3320
525cd185 3321 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1890d36b 3322 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
f1c6775b 3323 __skb_queue_tail(&chan->busy_q, skb);
525cd185 3324 return l2cap_try_push_rx_skb(chan);
712132eb
GP		 3325
3326
1890d36b
GP		 3327 }
3328
525cd185 3329 err = l2cap_ertm_reassembly_sdu(chan, skb, control);
1890d36b 3330 if (err >= 0) {
42e5c802 3331 chan->buffer_seq = (chan->buffer_seq + 1) % 64;
1890d36b
GP		 3332 return err;
3333 }
3334
3335 /* Busy Condition */
311bb895 3336 BT_DBG("chan %p, Enter local busy", chan);
0e98958d 3337
525cd185 3338 chan->conn_state |= L2CAP_CONN_LOCAL_BUSY;
1890d36b 3339 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
f1c6775b 3340 __skb_queue_tail(&chan->busy_q, skb);
1890d36b 3341
42e5c802 3342 sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1890d36b 3343 sctrl |= L2CAP_SUPER_RCV_NOT_READY;
525cd185 3344 l2cap_send_sframe(chan, sctrl);
1890d36b 3345
525cd185 3346 chan->conn_state |= L2CAP_CONN_RNR_SENT;
1890d36b 3347
1a09bcb9 3348 __clear_ack_timer(chan);
7fe9b298 3349
311bb895 3350 queue_work(_busy_wq, &chan->busy_work);
1890d36b
GP		 3351
3352 return err;
3353}
3354
525cd185 3355static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control)
c74e560c 3356{
c74e560c
GP		 3357 struct sk_buff *_skb;
3358 int err = -EINVAL;
3359
18778a63
GP		 3360 /*
3361 * TODO: We have to notify the userland if some data is lost with the
3362 * Streaming Mode.
3363 */
3364
c74e560c
GP		 3365 switch (control & L2CAP_CTRL_SAR) {
3366 case L2CAP_SDU_UNSEGMENTED:
525cd185 3367 if (chan->conn_state & L2CAP_CONN_SAR_SDU) {
6f61fd47 3368 kfree_skb(chan->sdu);
c74e560c
GP		 3369 break;
3370 }
3371
23070494 3372 err = chan->ops->recv(chan->data, skb);
c74e560c
GP		 3373 if (!err)
3374 return 0;
3375
3376 break;
3377
3378 case L2CAP_SDU_START:
525cd185 3379 if (chan->conn_state & L2CAP_CONN_SAR_SDU) {
6f61fd47 3380 kfree_skb(chan->sdu);
c74e560c
GP		 3381 break;
3382 }
3383
6f61fd47 3384 chan->sdu_len = get_unaligned_le16(skb->data);
c74e560c
GP		 3385 skb_pull(skb, 2);
3386
0c1bc5c6 3387 if (chan->sdu_len > chan->imtu) {
052897ca
GP		 3388 err = -EMSGSIZE;
3389 break;
3390 }
3391
6f61fd47
GP		 3392 chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC);
3393 if (!chan->sdu) {
c74e560c
GP		 3394 err = -ENOMEM;
3395 break;
3396 }
3397
6f61fd47 3398 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
c74e560c 3399
525cd185 3400 chan->conn_state |= L2CAP_CONN_SAR_SDU;
6f61fd47 3401 chan->partial_sdu_len = skb->len;
c74e560c
GP		 3402 err = 0;
3403 break;
3404
3405 case L2CAP_SDU_CONTINUE:
525cd185 3406 if (!(chan->conn_state & L2CAP_CONN_SAR_SDU))
c74e560c
GP		 3407 break;
3408
6f61fd47 3409 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
c74e560c 3410
6f61fd47
GP		 3411 chan->partial_sdu_len += skb->len;
3412 if (chan->partial_sdu_len > chan->sdu_len)
3413 kfree_skb(chan->sdu);
c74e560c
GP		 3414 else
3415 err = 0;
3416
3417 break;
3418
3419 case L2CAP_SDU_END:
525cd185 3420 if (!(chan->conn_state & L2CAP_CONN_SAR_SDU))
c74e560c
GP		 3421 break;
3422
6f61fd47 3423 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
c74e560c 3424
525cd185 3425 chan->conn_state &= ~L2CAP_CONN_SAR_SDU;
6f61fd47 3426 chan->partial_sdu_len += skb->len;
c74e560c 3427
0c1bc5c6 3428 if (chan->partial_sdu_len > chan->imtu)
36f2fd58
GP		 3429 goto drop;
3430
6f61fd47
GP		 3431 if (chan->partial_sdu_len == chan->sdu_len) {
3432 _skb = skb_clone(chan->sdu, GFP_ATOMIC);
23070494 3433 err = chan->ops->recv(chan->data, _skb);
c74e560c
GP		 3434 if (err < 0)
3435 kfree_skb(_skb);
3436 }
c74e560c
GP		 3437 err = 0;
3438
36f2fd58 3439drop:
6f61fd47 3440 kfree_skb(chan->sdu);
c74e560c
GP		 3441 break;
3442 }
3443
3444 kfree_skb(skb);
3445 return err;
3446}
3447
525cd185 3448static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq)
8f17154f
GP		 3449{
3450 struct sk_buff *skb;
afefdbc4 3451 u16 control;
8f17154f 3452
f1c6775b 3453 while ((skb = skb_peek(&chan->srej_q))) {
8f17154f
GP		 3454 if (bt_cb(skb)->tx_seq != tx_seq)
3455 break;
3456
f1c6775b 3457 skb = skb_dequeue(&chan->srej_q);
afefdbc4 3458 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
525cd185 3459 l2cap_ertm_reassembly_sdu(chan, skb, control);
42e5c802
GP		 3460 chan->buffer_seq_srej =
3461 (chan->buffer_seq_srej + 1) % 64;
8ff50ec0 3462 tx_seq = (tx_seq + 1) % 64;
8f17154f
GP		 3463 }
3464}
3465
525cd185 3466static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq)
8f17154f 3467{
8f17154f
GP		 3468 struct srej_list *l, *tmp;
3469 u16 control;
3470
39d5a3ee 3471 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
8f17154f
GP		 3472 if (l->tx_seq == tx_seq) {
3473 list_del(&l->list);
3474 kfree(l);
3475 return;
3476 }
3477 control = L2CAP_SUPER_SELECT_REJECT;
3478 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
525cd185 3479 l2cap_send_sframe(chan, control);
8f17154f 3480 list_del(&l->list);
39d5a3ee 3481 list_add_tail(&l->list, &chan->srej_l);
8f17154f
GP		 3482 }
3483}
3484
525cd185 3485static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq)
8f17154f 3486{
8f17154f
GP		 3487 struct srej_list *new;
3488 u16 control;
3489
42e5c802 3490 while (tx_seq != chan->expected_tx_seq) {
8f17154f 3491 control = L2CAP_SUPER_SELECT_REJECT;
42e5c802 3492 control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
525cd185 3493 l2cap_send_sframe(chan, control);
8f17154f
GP		 3494
3495 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
42e5c802
GP		 3496 new->tx_seq = chan->expected_tx_seq;
3497 chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
39d5a3ee 3498 list_add_tail(&new->list, &chan->srej_l);
8f17154f 3499 }
42e5c802 3500 chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
8f17154f
GP		 3501}
3502
525cd185 3503static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb)
1c2acffb 3504{
1c2acffb 3505 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3506 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3507 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
f6337c77 3508 int tx_seq_offset, expected_tx_seq_offset;
47d1ec61 3509 int num_to_ack = (chan->tx_win/6) + 1;
1c2acffb
GP		 3510 int err = 0;
3511
525cd185
GP		 3512 BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len,
3513 tx_seq, rx_control);
1c2acffb 3514
9b16dc65 3515 if (L2CAP_CTRL_FINAL & rx_control &&
525cd185 3516 chan->conn_state & L2CAP_CONN_WAIT_F) {
1a09bcb9 3517 __clear_monitor_timer(chan);
6a026610 3518 if (chan->unacked_frames > 0)
1a09bcb9 3519 __set_retrans_timer(chan);
525cd185 3520 chan->conn_state &= ~L2CAP_CONN_WAIT_F;
1d8f5d16
GP		 3521 }
3522
42e5c802
GP		 3523 chan->expected_ack_seq = req_seq;
3524 l2cap_drop_acked_frames(chan);
9f121a5a 3525
42e5c802 3526 if (tx_seq == chan->expected_tx_seq)
8f17154f 3527 goto expected;
1c2acffb 3528
42e5c802 3529 tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
9b53350d
JPRV		 3530 if (tx_seq_offset < 0)
3531 tx_seq_offset += 64;
3532
3533 /* invalid tx_seq */
47d1ec61 3534 if (tx_seq_offset >= chan->tx_win) {
8c1d787b 3535 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
9b53350d
JPRV		 3536 goto drop;
3537 }
3538
e6949280 3539 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY)
1890d36b
GP		 3540 goto drop;
3541
525cd185 3542 if (chan->conn_state & L2CAP_CONN_SREJ_SENT) {
8f17154f 3543 struct srej_list *first;
30afb5b2 3544
39d5a3ee 3545 first = list_first_entry(&chan->srej_l,
8f17154f
GP		 3546 struct srej_list, list);
3547 if (tx_seq == first->tx_seq) {
42e5c802 3548 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
525cd185 3549 l2cap_check_srej_gap(chan, tx_seq);
8f17154f
GP		 3550
3551 list_del(&first->list);
3552 kfree(first);
3553
39d5a3ee 3554 if (list_empty(&chan->srej_l)) {
42e5c802 3555 chan->buffer_seq = chan->buffer_seq_srej;
525cd185
GP		 3556 chan->conn_state &= ~L2CAP_CONN_SREJ_SENT;
3557 l2cap_send_ack(chan);
49208c9c 3558 BT_DBG("chan %p, Exit SREJ_SENT", chan);
8f17154f
GP		 3559 }
3560 } else {
3561 struct srej_list *l;
9b53350d
JPRV		 3562
3563 /* duplicated tx_seq */
42e5c802 3564 if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
9b53350d 3565 goto drop;
8f17154f 3566
39d5a3ee 3567 list_for_each_entry(l, &chan->srej_l, list) {
8f17154f 3568 if (l->tx_seq == tx_seq) {
525cd185 3569 l2cap_resend_srejframe(chan, tx_seq);
8f17154f
GP		 3570 return 0;
3571 }
3572 }
525cd185 3573 l2cap_send_srejframe(chan, tx_seq);
30afb5b2
GP		 3574 }
3575 } else {
9b53350d 3576 expected_tx_seq_offset =
42e5c802 3577 (chan->expected_tx_seq - chan->buffer_seq) % 64;
9b53350d
JPRV		 3578 if (expected_tx_seq_offset < 0)
3579 expected_tx_seq_offset += 64;
3580
3581 /* duplicated tx_seq */
3582 if (tx_seq_offset < expected_tx_seq_offset)
3583 goto drop;
3584
525cd185 3585 chan->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 3586
49208c9c 3587 BT_DBG("chan %p, Enter SREJ", chan);
0e98958d 3588
39d5a3ee 3589 INIT_LIST_HEAD(&chan->srej_l);
42e5c802 3590 chan->buffer_seq_srej = chan->buffer_seq;
8f17154f 3591
f1c6775b
GP		 3592 __skb_queue_head_init(&chan->srej_q);
3593 __skb_queue_head_init(&chan->busy_q);
42e5c802 3594 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
8f17154f 3595
525cd185 3596 chan->conn_state |= L2CAP_CONN_SEND_PBIT;
ef54fd93 3597
525cd185 3598 l2cap_send_srejframe(chan, tx_seq);
7fe9b298 3599
1a09bcb9 3600 __clear_ack_timer(chan);
1c2acffb 3601 }
30afb5b2
GP		 3602 return 0;
3603
8f17154f 3604expected:
42e5c802 3605 chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
8f17154f 3606
525cd185 3607 if (chan->conn_state & L2CAP_CONN_SREJ_SENT) {
3b1a9f3f
GP		 3608 bt_cb(skb)->tx_seq = tx_seq;
3609 bt_cb(skb)->sar = sar;
f1c6775b 3610 __skb_queue_tail(&chan->srej_q, skb);
8f17154f
GP		 3611 return 0;
3612 }
3613
525cd185 3614 err = l2cap_push_rx_skb(chan, skb, rx_control);
2ece3684
GP		 3615 if (err < 0)
3616 return 0;
3617
4ec10d97 3618 if (rx_control & L2CAP_CTRL_FINAL) {
525cd185
GP		 3619 if (chan->conn_state & L2CAP_CONN_REJ_ACT)
3620 chan->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be 3621 else
525cd185 3622 l2cap_retransmit_frames(chan);
4ec10d97
GP		 3623 }
3624
1a09bcb9 3625 __set_ack_timer(chan);
c1b4f43b 3626
6a026610
GP		 3627 chan->num_acked = (chan->num_acked + 1) % num_to_ack;
3628 if (chan->num_acked == num_to_ack - 1)
525cd185 3629 l2cap_send_ack(chan);
9e917af1 3630
8f17154f 3631 return 0;
9b53350d
JPRV		 3632
3633drop:
3634 kfree_skb(skb);
3635 return 0;
1c2acffb
GP		 3636}
3637
525cd185 3638static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control)
1c2acffb 3639{
49208c9c 3640 BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control),
0e98958d
GP		 3641 rx_control);
3642
42e5c802
GP		 3643 chan->expected_ack_seq = __get_reqseq(rx_control);
3644 l2cap_drop_acked_frames(chan);
1c2acffb 3645
e072745f 3646 if (rx_control & L2CAP_CTRL_POLL) {
525cd185
GP		 3647 chan->conn_state |= L2CAP_CONN_SEND_FBIT;
3648 if (chan->conn_state & L2CAP_CONN_SREJ_SENT) {
3649 if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
6a026610 3650 (chan->unacked_frames > 0))
1a09bcb9 3651 __set_retrans_timer(chan);
05fbd89d 3652
525cd185
GP		 3653 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3654 l2cap_send_srejtail(chan);
05fbd89d 3655 } else {
525cd185 3656 l2cap_send_i_or_rr_or_rnr(chan);
05fbd89d 3657 }
1d8f5d16 3658
e072745f 3659 } else if (rx_control & L2CAP_CTRL_FINAL) {
525cd185 3660 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 3661
525cd185
GP		 3662 if (chan->conn_state & L2CAP_CONN_REJ_ACT)
3663 chan->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be 3664 else
525cd185 3665 l2cap_retransmit_frames(chan);
2246b2f1 3666
e072745f 3667 } else {
525cd185 3668 if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
6a026610 3669 (chan->unacked_frames > 0))
1a09bcb9 3670 __set_retrans_timer(chan);
1c2acffb 3671
525cd185
GP		 3672 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3673 if (chan->conn_state & L2CAP_CONN_SREJ_SENT)
3674 l2cap_send_ack(chan);
894718a6 3675 else
525cd185 3676 l2cap_ertm_send(chan);
e072745f
GP		 3677 }
3678}
2246b2f1 3679
525cd185 3680static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control)
e072745f 3681{
e072745f 3682 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 3683
525cd185 3684 BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
0e98958d 3685
525cd185 3686 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
e072745f 3687
42e5c802
GP		 3688 chan->expected_ack_seq = tx_seq;
3689 l2cap_drop_acked_frames(chan);
e072745f
GP		 3690
3691 if (rx_control & L2CAP_CTRL_FINAL) {
525cd185
GP		 3692 if (chan->conn_state & L2CAP_CONN_REJ_ACT)
3693 chan->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be 3694 else
525cd185 3695 l2cap_retransmit_frames(chan);
e072745f 3696 } else {
525cd185 3697 l2cap_retransmit_frames(chan);
30afb5b2 3698
525cd185
GP		 3699 if (chan->conn_state & L2CAP_CONN_WAIT_F)
3700 chan->conn_state |= L2CAP_CONN_REJ_ACT;
e072745f
GP		 3701 }
3702}
525cd185 3703static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control)
e072745f 3704{
e072745f 3705 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 3706
525cd185 3707 BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
0e98958d 3708
525cd185 3709 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 3710
e072745f 3711 if (rx_control & L2CAP_CTRL_POLL) {
42e5c802
GP		 3712 chan->expected_ack_seq = tx_seq;
3713 l2cap_drop_acked_frames(chan);
3cb123d1 3714
525cd185
GP		 3715 chan->conn_state |= L2CAP_CONN_SEND_FBIT;
3716 l2cap_retransmit_one_frame(chan, tx_seq);
dfc909be 3717
525cd185 3718 l2cap_ertm_send(chan);
dfc909be 3719
525cd185 3720 if (chan->conn_state & L2CAP_CONN_WAIT_F) {
6a026610 3721 chan->srej_save_reqseq = tx_seq;
525cd185 3722 chan->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 3723 }
e072745f 3724 } else if (rx_control & L2CAP_CTRL_FINAL) {
525cd185 3725 if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) &&
6a026610 3726 chan->srej_save_reqseq == tx_seq)
525cd185 3727 chan->conn_state &= ~L2CAP_CONN_SREJ_ACT;
e072745f 3728 else
525cd185 3729 l2cap_retransmit_one_frame(chan, tx_seq);
e072745f 3730 } else {
525cd185
GP		 3731 l2cap_retransmit_one_frame(chan, tx_seq);
3732 if (chan->conn_state & L2CAP_CONN_WAIT_F) {
6a026610 3733 chan->srej_save_reqseq = tx_seq;
525cd185 3734 chan->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 3735 }
e072745f
GP		 3736 }
3737}
3738
525cd185 3739static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control)
e072745f 3740{
e072745f
GP		 3741 u8 tx_seq = __get_reqseq(rx_control);
3742
525cd185 3743 BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
0e98958d 3744
525cd185 3745 chan->conn_state |= L2CAP_CONN_REMOTE_BUSY;
42e5c802
GP		 3746 chan->expected_ack_seq = tx_seq;
3747 l2cap_drop_acked_frames(chan);
e072745f 3748
3cb123d1 3749 if (rx_control & L2CAP_CTRL_POLL)
525cd185 3750 chan->conn_state |= L2CAP_CONN_SEND_FBIT;
3cb123d1 3751
525cd185 3752 if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) {
1a09bcb9 3753 __clear_retrans_timer(chan);
a2e12a2a 3754 if (rx_control & L2CAP_CTRL_POLL)
525cd185 3755 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
99b0d4b7 3756 return;
e072745f 3757 }
99b0d4b7
GP		 3758
3759 if (rx_control & L2CAP_CTRL_POLL)
525cd185 3760 l2cap_send_srejtail(chan);
99b0d4b7 3761 else
525cd185 3762 l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY);
e072745f
GP		 3763}
3764
525cd185 3765static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb)
e072745f 3766{
525cd185 3767 BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len);
e072745f 3768
9b16dc65 3769 if (L2CAP_CTRL_FINAL & rx_control &&
525cd185 3770 chan->conn_state & L2CAP_CONN_WAIT_F) {
1a09bcb9 3771 __clear_monitor_timer(chan);
6a026610 3772 if (chan->unacked_frames > 0)
1a09bcb9 3773 __set_retrans_timer(chan);
525cd185 3774 chan->conn_state &= ~L2CAP_CONN_WAIT_F;
e072745f
GP		 3775 }
3776
3777 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
3778 case L2CAP_SUPER_RCV_READY:
525cd185 3779 l2cap_data_channel_rrframe(chan, rx_control);
8f17154f
GP		 3780 break;
3781
e072745f 3782 case L2CAP_SUPER_REJECT:
525cd185 3783 l2cap_data_channel_rejframe(chan, rx_control);
e072745f 3784 break;
2246b2f1 3785
e072745f 3786 case L2CAP_SUPER_SELECT_REJECT:
525cd185 3787 l2cap_data_channel_srejframe(chan, rx_control);
e072745f
GP		 3788 break;
3789
3790 case L2CAP_SUPER_RCV_NOT_READY:
525cd185 3791 l2cap_data_channel_rnrframe(chan, rx_control);
1c2acffb
GP		 3792 break;
3793 }
3794
faaebd19 3795 kfree_skb(skb);
1c2acffb
GP		 3796 return 0;
3797}
3798
218bb9df
GP		 3799static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
3800{
525cd185 3801 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
218bb9df
GP		 3802 u16 control;
3803 u8 req_seq;
3804 int len, next_tx_seq_offset, req_seq_offset;
3805
3806 control = get_unaligned_le16(skb->data);
3807 skb_pull(skb, 2);
3808 len = skb->len;
3809
3810 /*
3811 * We can just drop the corrupted I-frame here.
3812 * Receiver will miss it and start proper recovery
3813 * procedures and ask retransmission.
3814 */
47d1ec61 3815 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 3816 goto drop;
3817
3818 if (__is_sar_start(control) && __is_iframe(control))
3819 len -= 2;
3820
47d1ec61 3821 if (chan->fcs == L2CAP_FCS_CRC16)
218bb9df
GP		 3822 len -= 2;
3823
47d1ec61 3824 if (len > chan->mps) {
8c1d787b 3825 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 3826 goto drop;
3827 }
3828
3829 req_seq = __get_reqseq(control);
42e5c802 3830 req_seq_offset = (req_seq - chan->expected_ack_seq) % 64;
218bb9df
GP		 3831 if (req_seq_offset < 0)
3832 req_seq_offset += 64;
3833
3834 next_tx_seq_offset =
42e5c802 3835 (chan->next_tx_seq - chan->expected_ack_seq) % 64;
218bb9df
GP		 3836 if (next_tx_seq_offset < 0)
3837 next_tx_seq_offset += 64;
3838
3839 /* check for invalid req-seq */
3840 if (req_seq_offset > next_tx_seq_offset) {
8c1d787b 3841 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 3842 goto drop;
3843 }
3844
3845 if (__is_iframe(control)) {
3846 if (len < 0) {
8c1d787b 3847 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 3848 goto drop;
3849 }
3850
525cd185 3851 l2cap_data_channel_iframe(chan, control, skb);
218bb9df
GP		 3852 } else {
3853 if (len != 0) {
3854 BT_ERR("%d", len);
8c1d787b 3855 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 3856 goto drop;
3857 }
3858
525cd185 3859 l2cap_data_channel_sframe(chan, control, skb);
218bb9df
GP		 3860 }
3861
3862 return 0;
3863
3864drop:
3865 kfree_skb(skb);
3866 return 0;
3867}
3868
1da177e4
LT		 3869static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
3870{
48454079 3871 struct l2cap_chan *chan;
bf734843 3872 struct sock *sk = NULL;
51893f88 3873 u16 control;
218bb9df
GP		 3874 u8 tx_seq;
3875 int len;
1da177e4 3876
baa7e1fa 3877 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 3878 if (!chan) {
1da177e4
LT		 3879 BT_DBG("unknown cid 0x%4.4x", cid);
3880 goto drop;
3881 }
3882
48454079 3883 sk = chan->sk;
6840ed07 3884
49208c9c 3885 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 3886
89bc500e 3887 if (chan->state != BT_CONNECTED)
1da177e4
LT		 3888 goto drop;
3889
0c1bc5c6 3890 switch (chan->mode) {
1c2acffb
GP		 3891 case L2CAP_MODE_BASIC:
3892 /* If socket recv buffers overflows we drop data here
3893 * which is *bad* because L2CAP has to be reliable.
3894 * But we don't have any other choice. L2CAP doesn't
3895 * provide flow control mechanism. */
1da177e4 3896
0c1bc5c6 3897 if (chan->imtu < skb->len)
1c2acffb 3898 goto drop;
1da177e4 3899
23070494 3900 if (!chan->ops->recv(chan->data, skb))
1c2acffb
GP		 3901 goto done;
3902 break;
3903
3904 case L2CAP_MODE_ERTM:
218bb9df
GP		 3905 if (!sock_owned_by_user(sk)) {
3906 l2cap_ertm_data_rcv(sk, skb);
277ffbe3 3907 } else {
218bb9df 3908 if (sk_add_backlog(sk, skb))
277ffbe3 3909 goto drop;
277ffbe3 3910 }
1c2acffb 3911
fcafde2e 3912 goto done;
1c2acffb 3913
6840ed07
GP		 3914 case L2CAP_MODE_STREAMING:
3915 control = get_unaligned_le16(skb->data);
3916 skb_pull(skb, 2);
3917 len = skb->len;
3918
47d1ec61 3919 if (l2cap_check_fcs(chan, skb))
26000089
GP		 3920 goto drop;
3921
6840ed07
GP		 3922 if (__is_sar_start(control))
3923 len -= 2;
3924
47d1ec61 3925 if (chan->fcs == L2CAP_FCS_CRC16)
fcc203c3
GP		 3926 len -= 2;
3927
47d1ec61 3928 if (len > chan->mps || len < 0 || __is_sframe(control))
6840ed07
GP		 3929 goto drop;
3930
3931 tx_seq = __get_txseq(control);
3932
42e5c802
GP		 3933 if (chan->expected_tx_seq == tx_seq)
3934 chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
6840ed07 3935 else
42e5c802 3936 chan->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 3937
525cd185 3938 l2cap_streaming_reassembly_sdu(chan, skb, control);
6840ed07
GP		 3939
3940 goto done;
3941
1c2acffb 3942 default:
0c1bc5c6 3943 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 3944 break;
3945 }
1da177e4
LT		 3946
3947drop:
3948 kfree_skb(skb);
3949
3950done:
0139418c
MH		 3951 if (sk)
3952 bh_unlock_sock(sk);
3953
1da177e4
LT		 3954 return 0;
3955}
3956
8e036fc3 3957static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4 3958{
6dcae1ea 3959 struct sock *sk = NULL;
23691d75 3960 struct l2cap_chan *chan;
1da177e4 3961
23691d75
GP		 3962 chan = l2cap_global_chan_by_psm(0, psm, conn->src);
3963 if (!chan)
1da177e4
LT		 3964 goto drop;
3965
23691d75
GP		 3966 sk = chan->sk;
3967
e0f0cb56
GP		 3968 bh_lock_sock(sk);
3969
1da177e4
LT		 3970 BT_DBG("sk %p, len %d", sk, skb->len);
3971
89bc500e 3972 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 3973 goto drop;
3974
0c1bc5c6 3975 if (l2cap_pi(sk)->chan->imtu < skb->len)
1da177e4
LT		 3976 goto drop;
3977
23070494 3978 if (!chan->ops->recv(chan->data, skb))
1da177e4
LT		 3979 goto done;
3980
3981drop:
3982 kfree_skb(skb);
3983
3984done:
af05b30b
GP		 3985 if (sk)
3986 bh_unlock_sock(sk);
1da177e4
LT		 3987 return 0;
3988}
3989
9f69bda6
GP		 3990static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb)
3991{
6dcae1ea 3992 struct sock *sk = NULL;
23691d75 3993 struct l2cap_chan *chan;
9f69bda6 3994
23691d75
GP		 3995 chan = l2cap_global_chan_by_scid(0, cid, conn->src);
3996 if (!chan)
9f69bda6
GP		 3997 goto drop;
3998
23691d75
GP		 3999 sk = chan->sk;
4000
9f69bda6
GP		 4001 bh_lock_sock(sk);
4002
4003 BT_DBG("sk %p, len %d", sk, skb->len);
4004
89bc500e 4005 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 4006 goto drop;
4007
0c1bc5c6 4008 if (l2cap_pi(sk)->chan->imtu < skb->len)
9f69bda6
GP		 4009 goto drop;
4010
23070494 4011 if (!chan->ops->recv(chan->data, skb))
9f69bda6
GP		 4012 goto done;
4013
4014drop:
4015 kfree_skb(skb);
4016
4017done:
4018 if (sk)
4019 bh_unlock_sock(sk);
4020 return 0;
4021}
4022
1da177e4
LT		 4023static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4024{
4025 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4026 u16 cid, len;
4027 __le16 psm;
1da177e4
LT		 4028
4029 skb_pull(skb, L2CAP_HDR_SIZE);
4030 cid = __le16_to_cpu(lh->cid);
4031 len = __le16_to_cpu(lh->len);
4032
1c2acffb
GP		 4033 if (len != skb->len) {
4034 kfree_skb(skb);
4035 return;
4036 }
4037
1da177e4
LT		 4038 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4039
4040 switch (cid) {
3300d9a9 4041 case L2CAP_CID_LE_SIGNALING:
8db4dc46 4042 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4043 l2cap_sig_channel(conn, skb);
4044 break;
4045
8db4dc46 4046 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4047 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4048 skb_pull(skb, 2);
4049 l2cap_conless_channel(conn, psm, skb);
4050 break;
4051
9f69bda6
GP		 4052 case L2CAP_CID_LE_DATA:
4053 l2cap_att_channel(conn, cid, skb);
4054 break;
4055
b501d6a1
AB		 4056 case L2CAP_CID_SMP:
4057 if (smp_sig_channel(conn, skb))
4058 l2cap_conn_del(conn->hcon, EACCES);
4059 break;
4060
1da177e4
LT		 4061 default:
4062 l2cap_data_channel(conn, cid, skb);
4063 break;
4064 }
4065}
4066
4067/* ---- L2CAP interface with lower layer (HCI) ---- */
4068
4069static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
4070{
4071 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 4072 struct l2cap_chan *c;
1da177e4
LT		 4073
4074 if (type != ACL_LINK)
963cf687 4075 return -EINVAL;
1da177e4
LT		 4076
4077 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4078
4079 /* Find listening sockets and check their link_mode */
23691d75
GP		 4080 read_lock(&chan_list_lock);
4081 list_for_each_entry(c, &chan_list, global_l) {
4082 struct sock *sk = c->sk;
4343478f 4083
89bc500e 4084 if (c->state != BT_LISTEN)
1da177e4
LT		 4085 continue;
4086
4087 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 4088 lm1 |= HCI_LM_ACCEPT;
23691d75 4089 if (c->role_switch)
2af6b9d5 4090 lm1 |= HCI_LM_MASTER;
1da177e4 4091 exact++;
2af6b9d5
MH		 4092 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4093 lm2 |= HCI_LM_ACCEPT;
23691d75 4094 if (c->role_switch)
2af6b9d5
MH		 4095 lm2 |= HCI_LM_MASTER;
4096 }
1da177e4 4097 }
23691d75 4098 read_unlock(&chan_list_lock);
1da177e4
LT		 4099
4100 return exact ? lm1 : lm2;
4101}
4102
4103static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
4104{
0139418c
MH		 4105 struct l2cap_conn *conn;
4106
1da177e4
LT		 4107 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4108
acd7d370 4109 if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK))
963cf687 4110 return -EINVAL;
1da177e4
LT		 4111
4112 if (!status) {
1da177e4
LT		 4113 conn = l2cap_conn_add(hcon, status);
4114 if (conn)
4115 l2cap_conn_ready(conn);
0139418c 4116 } else
1da177e4
LT		 4117 l2cap_conn_del(hcon, bt_err(status));
4118
4119 return 0;
4120}
4121
2950f21a
MH		 4122static int l2cap_disconn_ind(struct hci_conn *hcon)
4123{
4124 struct l2cap_conn *conn = hcon->l2cap_data;
4125
4126 BT_DBG("hcon %p", hcon);
4127
b5694506 4128 if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn)
2950f21a
MH		 4129 return 0x13;
4130
4131 return conn->disc_reason;
4132}
4133
4134static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4135{
4136 BT_DBG("hcon %p reason %d", hcon, reason);
4137
acd7d370 4138 if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK))
963cf687 4139 return -EINVAL;
1da177e4
LT		 4140
4141 l2cap_conn_del(hcon, bt_err(reason));
0139418c 4142
1da177e4
LT		 4143 return 0;
4144}
4145
4343478f 4146static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 4147{
715ec005 4148 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 4149 return;
4150
f62e4323 4151 if (encrypt == 0x00) {
4343478f 4152 if (chan->sec_level == BT_SECURITY_MEDIUM) {
c9b66675
GP		 4153 __clear_chan_timer(chan);
4154 __set_chan_timer(chan, HZ * 5);
4343478f 4155 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 4156 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 4157 } else {
4343478f 4158 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 4159 __clear_chan_timer(chan);
f62e4323
MH		 4160 }
4161}
4162
8c1b2355 4163static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 4164{
0139418c 4165 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 4166 struct l2cap_chan *chan;
1da177e4 4167
0139418c 4168 if (!conn)
1da177e4 4169 return 0;
0139418c 4170
1da177e4
LT		 4171 BT_DBG("conn %p", conn);
4172
baa7e1fa 4173 read_lock(&conn->chan_lock);
1da177e4 4174
baa7e1fa 4175 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 4176 struct sock *sk = chan->sk;
baa7e1fa 4177
1da177e4
LT		 4178 bh_lock_sock(sk);
4179
f1cb9af5
VCG		 4180 BT_DBG("chan->scid %d", chan->scid);
4181
4182 if (chan->scid == L2CAP_CID_LE_DATA) {
4183 if (!status && encrypt) {
4184 chan->sec_level = hcon->sec_level;
4185 l2cap_chan_ready(sk);
4186 }
4187
4188 bh_unlock_sock(sk);
4189 continue;
4190 }
4191
b4450035 4192 if (chan->conf_state & L2CAP_CONF_CONNECT_PEND) {
6a8d3010
MH		 4193 bh_unlock_sock(sk);
4194 continue;
4195 }
4196
89bc500e
GP		 4197 if (!status && (chan->state == BT_CONNECTED ||
4198 chan->state == BT_CONFIG)) {
4343478f 4199 l2cap_check_encryption(chan, encrypt);
9719f8af
MH		 4200 bh_unlock_sock(sk);
4201 continue;
4202 }
4203
89bc500e 4204 if (chan->state == BT_CONNECT) {
b1235d79
MH		 4205 if (!status) {
4206 struct l2cap_conn_req req;
fe4128e0
GP		 4207 req.scid = cpu_to_le16(chan->scid);
4208 req.psm = chan->psm;
1da177e4 4209
fc7f8a7e 4210 chan->ident = l2cap_get_ident(conn);
b4450035 4211 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4 4212
fc7f8a7e 4213 l2cap_send_cmd(conn, chan->ident,
b1235d79
MH		 4214 L2CAP_CONN_REQ, sizeof(req), &req);
4215 } else {
c9b66675
GP		 4216 __clear_chan_timer(chan);
4217 __set_chan_timer(chan, HZ / 10);
b1235d79 4218 }
89bc500e 4219 } else if (chan->state == BT_CONNECT2) {
b1235d79
MH		 4220 struct l2cap_conn_rsp rsp;
4221 __u16 result;
1da177e4 4222
b1235d79 4223 if (!status) {
89bc500e 4224 l2cap_state_change(chan, BT_CONFIG);
b1235d79
MH		 4225 result = L2CAP_CR_SUCCESS;
4226 } else {
89bc500e 4227 l2cap_state_change(chan, BT_DISCONN);
c9b66675 4228 __set_chan_timer(chan, HZ / 10);
b1235d79
MH		 4229 result = L2CAP_CR_SEC_BLOCK;
4230 }
4231
fe4128e0
GP		 4232 rsp.scid = cpu_to_le16(chan->dcid);
4233 rsp.dcid = cpu_to_le16(chan->scid);
b1235d79 4234 rsp.result = cpu_to_le16(result);
e7c29cb1 4235 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
fc7f8a7e
GP		 4236 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
4237 sizeof(rsp), &rsp);
b1235d79 4238 }
1da177e4
LT		 4239
4240 bh_unlock_sock(sk);
4241 }
4242
baa7e1fa 4243 read_unlock(&conn->chan_lock);
b1235d79 4244
1da177e4
LT		 4245 return 0;
4246}
4247
4248static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4249{
4250 struct l2cap_conn *conn = hcon->l2cap_data;
4251
5a08ecce
AE		 4252 if (!conn)
4253 conn = l2cap_conn_add(hcon, 0);
4254
4255 if (!conn)
1da177e4
LT		 4256 goto drop;
4257
4258 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4259
e702112f 4260 if (!(flags & ACL_CONT)) {
1da177e4 4261 struct l2cap_hdr *hdr;
48454079 4262 struct l2cap_chan *chan;
89794813 4263 u16 cid;
1da177e4
LT		 4264 int len;
4265
4266 if (conn->rx_len) {
4267 BT_ERR("Unexpected start frame (len %d)", skb->len);
4268 kfree_skb(conn->rx_skb);
4269 conn->rx_skb = NULL;
4270 conn->rx_len = 0;
4271 l2cap_conn_unreliable(conn, ECOMM);
4272 }
4273
aae7fe22
AE		 4274 /* Start fragment always begin with Basic L2CAP header */
4275 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 4276 BT_ERR("Frame is too short (len %d)", skb->len);
4277 l2cap_conn_unreliable(conn, ECOMM);
4278 goto drop;
4279 }
4280
4281 hdr = (struct l2cap_hdr *) skb->data;
4282 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
89794813 4283 cid = __le16_to_cpu(hdr->cid);
1da177e4
LT		 4284
4285 if (len == skb->len) {
4286 /* Complete frame received */
4287 l2cap_recv_frame(conn, skb);
4288 return 0;
4289 }
4290
4291 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4292
4293 if (skb->len > len) {
4294 BT_ERR("Frame is too long (len %d, expected len %d)",
4295 skb->len, len);
4296 l2cap_conn_unreliable(conn, ECOMM);
4297 goto drop;
4298 }
4299
baa7e1fa 4300 chan = l2cap_get_chan_by_scid(conn, cid);
89794813 4301
48454079
GP		 4302 if (chan && chan->sk) {
4303 struct sock *sk = chan->sk;
89794813 4304
0c1bc5c6 4305 if (chan->imtu < len - L2CAP_HDR_SIZE) {
48454079
GP		 4306 BT_ERR("Frame exceeding recv MTU (len %d, "
4307 "MTU %d)", len,
0c1bc5c6 4308 chan->imtu);
48454079
GP		 4309 bh_unlock_sock(sk);
4310 l2cap_conn_unreliable(conn, ECOMM);
4311 goto drop;
4312 }
89794813 4313 bh_unlock_sock(sk);
48454079 4314 }
89794813 4315
1da177e4 4316 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4317 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4318 if (!conn->rx_skb)
1da177e4
LT		 4319 goto drop;
4320
d626f62b 4321 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4322 skb->len);
1da177e4
LT		 4323 conn->rx_len = len - skb->len;
4324 } else {
4325 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4326
4327 if (!conn->rx_len) {
4328 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4329 l2cap_conn_unreliable(conn, ECOMM);
4330 goto drop;
4331 }
4332
4333 if (skb->len > conn->rx_len) {
4334 BT_ERR("Fragment is too long (len %d, expected %d)",
4335 skb->len, conn->rx_len);
4336 kfree_skb(conn->rx_skb);
4337 conn->rx_skb = NULL;
4338 conn->rx_len = 0;
4339 l2cap_conn_unreliable(conn, ECOMM);
4340 goto drop;
4341 }
4342
d626f62b 4343 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4344 skb->len);
1da177e4
LT		 4345 conn->rx_len -= skb->len;
4346
4347 if (!conn->rx_len) {
4348 /* Complete frame received */
4349 l2cap_recv_frame(conn, conn->rx_skb);
4350 conn->rx_skb = NULL;
4351 }
4352 }
4353
4354drop:
4355 kfree_skb(skb);
4356 return 0;
4357}
4358
aef7d97c 4359static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 4360{
23691d75 4361 struct l2cap_chan *c;
1da177e4 4362
23691d75 4363 read_lock_bh(&chan_list_lock);
1da177e4 4364
23691d75
GP		 4365 list_for_each_entry(c, &chan_list, global_l) {
4366 struct sock *sk = c->sk;
101545f6 4367
903d343e 4368 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
aef7d97c
MH		 4369 batostr(&bt_sk(sk)->src),
4370 batostr(&bt_sk(sk)->dst),
89bc500e 4371 c->state, __le16_to_cpu(c->psm),
23691d75
GP		 4372 c->scid, c->dcid, c->imtu, c->omtu,
4373 c->sec_level, c->mode);
be9d1227 4374 }
1da177e4 4375
23691d75 4376 read_unlock_bh(&chan_list_lock);
1da177e4 4377
aef7d97c 4378 return 0;
1da177e4
LT		 4379}
4380
aef7d97c
MH		 4381static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4382{
4383 return single_open(file, l2cap_debugfs_show, inode->i_private);
4384}
4385
4386static const struct file_operations l2cap_debugfs_fops = {
4387 .open = l2cap_debugfs_open,
4388 .read = seq_read,
4389 .llseek = seq_lseek,
4390 .release = single_release,
4391};
4392
4393static struct dentry *l2cap_debugfs;
1da177e4 4394
1da177e4
LT		 4395static struct hci_proto l2cap_hci_proto = {
4396 .name = "L2CAP",
4397 .id = HCI_PROTO_L2CAP,
4398 .connect_ind = l2cap_connect_ind,
4399 .connect_cfm = l2cap_connect_cfm,
4400 .disconn_ind = l2cap_disconn_ind,
2950f21a 4401 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4402 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4403 .recv_acldata = l2cap_recv_acldata
4404};
4405
64274518 4406int __init l2cap_init(void)
1da177e4
LT		 4407{
4408 int err;
be9d1227 4409
bb58f747 4410 err = l2cap_init_sockets();
1da177e4
LT		 4411 if (err < 0)
4412 return err;
4413
1890d36b 4414 _busy_wq = create_singlethread_workqueue("l2cap");
b78d7b4f 4415 if (!_busy_wq) {
bb58f747 4416 err = -ENOMEM;
1da177e4
LT		 4417 goto error;
4418 }
4419
4420 err = hci_register_proto(&l2cap_hci_proto);
4421 if (err < 0) {
4422 BT_ERR("L2CAP protocol registration failed");
4423 bt_sock_unregister(BTPROTO_L2CAP);
4424 goto error;
4425 }
4426
aef7d97c
MH		 4427 if (bt_debugfs) {
4428 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4429 bt_debugfs, NULL, &l2cap_debugfs_fops);
4430 if (!l2cap_debugfs)
4431 BT_ERR("Failed to create L2CAP debug file");
4432 }
1da177e4 4433
1da177e4
LT		 4434 return 0;
4435
4436error:
b78d7b4f 4437 destroy_workqueue(_busy_wq);
bb58f747 4438 l2cap_cleanup_sockets();
1da177e4
LT		 4439 return err;
4440}
4441
64274518 4442void l2cap_exit(void)
1da177e4 4443{
aef7d97c 4444 debugfs_remove(l2cap_debugfs);
1da177e4 4445
1890d36b
GP		 4446 flush_workqueue(_busy_wq);
4447 destroy_workqueue(_busy_wq);
4448
1da177e4
LT		 4449 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4450 BT_ERR("L2CAP protocol unregistration failed");
4451
bb58f747 4452 l2cap_cleanup_sockets();
1da177e4
LT		 4453}
4454
d1c4a17d
GP		 4455module_param(disable_ertm, bool, 0644);
4456MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Empty description
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