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Bluetooth: Fixed checkpatch warnings
[deliverable/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 <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
422e925b 7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
1da177e4
LT		 8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
8e87d142
YH		 24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 26 SOFTWARE IS DISCLAIMED.
27*/
28
bb58f747 29/* Bluetooth L2CAP core. */
1da177e4 30
1da177e4
LT		 31#include <linux/module.h>
32
33#include <linux/types.h>
4fc268d2 34#include <linux/capability.h>
1da177e4
LT		 35#include <linux/errno.h>
36#include <linux/kernel.h>
1da177e4
LT		 37#include <linux/sched.h>
38#include <linux/slab.h>
39#include <linux/poll.h>
40#include <linux/fcntl.h>
41#include <linux/init.h>
42#include <linux/interrupt.h>
43#include <linux/socket.h>
44#include <linux/skbuff.h>
1da177e4 45#include <linux/list.h>
be9d1227 46#include <linux/device.h>
aef7d97c
MH		 47#include <linux/debugfs.h>
48#include <linux/seq_file.h>
af05b30b 49#include <linux/uaccess.h>
fcc203c3 50#include <linux/crc16.h>
1da177e4
LT		 51#include <net/sock.h>
52
1da177e4
LT		 53#include <asm/unaligned.h>
54
55#include <net/bluetooth/bluetooth.h>
56#include <net/bluetooth/hci_core.h>
57#include <net/bluetooth/l2cap.h>
b501d6a1 58#include <net/bluetooth/smp.h>
1da177e4 59
eb939922 60bool disable_ertm;
f0709e03 61
47ec1dcd 62static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
50a147cd 63static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
1da177e4 64
b5ad8b7f
JB		 65static LIST_HEAD(chan_list);
66static DEFINE_RWLOCK(chan_list_lock);
1da177e4 67
1da177e4
LT		 68static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
69 u8 code, u8 ident, u16 dlen, void *data);
4519de9a
GP		 70static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
71 void *data);
710f9b0a 72static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
4519de9a
GP		 73static void l2cap_send_disconn_req(struct l2cap_conn *conn,
74 struct l2cap_chan *chan, int err);
1da177e4 75
0139418c 76/* ---- L2CAP channels ---- */
71ba0e56 77
baa7e1fa 78static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
0139418c 79{
3df91ea2 80 struct l2cap_chan *c;
3d57dc68 81
3df91ea2
AE		 82 list_for_each_entry(c, &conn->chan_l, list) {
83 if (c->dcid == cid)
84 return c;
0139418c 85 }
3df91ea2 86 return NULL;
0139418c
MH		 87}
88
baa7e1fa 89static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 90{
3df91ea2 91 struct l2cap_chan *c;
3d57dc68 92
3df91ea2
AE		 93 list_for_each_entry(c, &conn->chan_l, list) {
94 if (c->scid == cid)
95 return c;
0139418c 96 }
3df91ea2 97 return NULL;
0139418c
MH		 98}
99
100/* Find channel with given SCID.
101 * Returns locked socket */
baa7e1fa 102static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 103{
48454079 104 struct l2cap_chan *c;
baa7e1fa 105
3df91ea2 106 mutex_lock(&conn->chan_lock);
baa7e1fa 107 c = __l2cap_get_chan_by_scid(conn, cid);
3df91ea2
AE		 108 mutex_unlock(&conn->chan_lock);
109
48454079 110 return c;
0139418c
MH		 111}
112
baa7e1fa 113static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 114{
3df91ea2 115 struct l2cap_chan *c;
3d57dc68 116
3df91ea2
AE		 117 list_for_each_entry(c, &conn->chan_l, list) {
118 if (c->ident == ident)
119 return c;
0139418c 120 }
3df91ea2 121 return NULL;
0139418c
MH		 122}
123
23691d75 124static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 125{
23691d75 126 struct l2cap_chan *c;
9e4425ff 127
23691d75
GP		 128 list_for_each_entry(c, &chan_list, global_l) {
129 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
250938cb 130 return c;
9e4425ff 131 }
250938cb 132 return NULL;
9e4425ff
GP		 133}
134
135int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
136{
73b2ec18
GP		 137 int err;
138
333055f2 139 write_lock(&chan_list_lock);
9e4425ff 140
23691d75 141 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 142 err = -EADDRINUSE;
143 goto done;
9e4425ff
GP		 144 }
145
73b2ec18
GP		 146 if (psm) {
147 chan->psm = psm;
148 chan->sport = psm;
149 err = 0;
150 } else {
151 u16 p;
152
153 err = -EINVAL;
154 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 155 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 156 chan->psm = cpu_to_le16(p);
157 chan->sport = cpu_to_le16(p);
158 err = 0;
159 break;
160 }
161 }
9e4425ff 162
73b2ec18 163done:
333055f2 164 write_unlock(&chan_list_lock);
73b2ec18 165 return err;
9e4425ff
GP		 166}
167
168int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
169{
333055f2 170 write_lock(&chan_list_lock);
9e4425ff
GP		 171
172 chan->scid = scid;
173
333055f2 174 write_unlock(&chan_list_lock);
9e4425ff
GP		 175
176 return 0;
177}
178
baa7e1fa 179static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 180{
8db4dc46 181 u16 cid = L2CAP_CID_DYN_START;
0139418c 182
8db4dc46 183 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 184 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 185 return cid;
186 }
187
188 return 0;
189}
190
0e587be7 191static void __l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 192{
42d2d87c 193 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
badaaa00
GP		 194 state_to_string(state));
195
89bc500e
GP		 196 chan->state = state;
197 chan->ops->state_change(chan->data, state);
198}
199
0e587be7
AE		 200static void l2cap_state_change(struct l2cap_chan *chan, int state)
201{
202 struct sock *sk = chan->sk;
203
204 lock_sock(sk);
205 __l2cap_state_change(chan, state);
206 release_sock(sk);
207}
208
2e0052e4
AE		 209static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err)
210{
211 struct sock *sk = chan->sk;
212
213 sk->sk_err = err;
214}
215
216static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
217{
218 struct sock *sk = chan->sk;
219
220 lock_sock(sk);
221 __l2cap_chan_set_err(chan, err);
222 release_sock(sk);
223}
224
3c588192
MM		 225/* ---- L2CAP sequence number lists ---- */
226
227/* For ERTM, ordered lists of sequence numbers must be tracked for
228 * SREJ requests that are received and for frames that are to be
229 * retransmitted. These seq_list functions implement a singly-linked
230 * list in an array, where membership in the list can also be checked
231 * in constant time. Items can also be added to the tail of the list
232 * and removed from the head in constant time, without further memory
233 * allocs or frees.
234 */
235
236static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
237{
238 size_t alloc_size, i;
239
240 /* Allocated size is a power of 2 to map sequence numbers
241 * (which may be up to 14 bits) in to a smaller array that is
242 * sized for the negotiated ERTM transmit windows.
243 */
244 alloc_size = roundup_pow_of_two(size);
245
246 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
247 if (!seq_list->list)
248 return -ENOMEM;
249
250 seq_list->mask = alloc_size - 1;
251 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
252 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
253 for (i = 0; i < alloc_size; i++)
254 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
255
256 return 0;
257}
258
259static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
260{
261 kfree(seq_list->list);
262}
263
264static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
265 u16 seq)
266{
267 /* Constant-time check for list membership */
268 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
269}
270
271static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
272{
273 u16 mask = seq_list->mask;
274
275 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
276 /* In case someone tries to pop the head of an empty list */
277 return L2CAP_SEQ_LIST_CLEAR;
278 } else if (seq_list->head == seq) {
279 /* Head can be removed in constant time */
280 seq_list->head = seq_list->list[seq & mask];
281 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
282
283 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
284 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
285 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
286 }
287 } else {
288 /* Walk the list to find the sequence number */
289 u16 prev = seq_list->head;
290 while (seq_list->list[prev & mask] != seq) {
291 prev = seq_list->list[prev & mask];
292 if (prev == L2CAP_SEQ_LIST_TAIL)
293 return L2CAP_SEQ_LIST_CLEAR;
294 }
295
296 /* Unlink the number from the list and clear it */
297 seq_list->list[prev & mask] = seq_list->list[seq & mask];
298 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
299 if (seq_list->tail == seq)
300 seq_list->tail = prev;
301 }
302 return seq;
303}
304
305static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
306{
307 /* Remove the head in constant time */
308 return l2cap_seq_list_remove(seq_list, seq_list->head);
309}
310
311static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
312{
313 if (seq_list->head != L2CAP_SEQ_LIST_CLEAR) {
314 u16 i;
315 for (i = 0; i <= seq_list->mask; i++)
316 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
317
318 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
319 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
320 }
321}
322
323static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
324{
325 u16 mask = seq_list->mask;
326
327 /* All appends happen in constant time */
328
329 if (seq_list->list[seq & mask] == L2CAP_SEQ_LIST_CLEAR) {
330 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
331 seq_list->head = seq;
332 else
333 seq_list->list[seq_list->tail & mask] = seq;
334
335 seq_list->tail = seq;
336 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
337 }
338}
339
721c4181 340static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 341{
721c4181
GP		 342 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
343 chan_timer.work);
3df91ea2 344 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 345 int reason;
346
e05dcc32 347 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 348
3df91ea2 349 mutex_lock(&conn->chan_lock);
6be36555 350 l2cap_chan_lock(chan);
ab07801d 351
89bc500e 352 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 353 reason = ECONNREFUSED;
89bc500e 354 else if (chan->state == BT_CONNECT &&
ab07801d
GP		 355 chan->sec_level != BT_SECURITY_SDP)
356 reason = ECONNREFUSED;
357 else
358 reason = ETIMEDOUT;
359
0f852724 360 l2cap_chan_close(chan, reason);
ab07801d 361
6be36555 362 l2cap_chan_unlock(chan);
ab07801d 363
ba3bd0ee 364 chan->ops->close(chan->data);
3df91ea2
AE		 365 mutex_unlock(&conn->chan_lock);
366
371fd835 367 l2cap_chan_put(chan);
ab07801d
GP		 368}
369
eef1d9b6 370struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 371{
372 struct l2cap_chan *chan;
373
374 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
375 if (!chan)
376 return NULL;
377
c03b355e
AE		 378 mutex_init(&chan->lock);
379
333055f2 380 write_lock(&chan_list_lock);
23691d75 381 list_add(&chan->global_l, &chan_list);
333055f2 382 write_unlock(&chan_list_lock);
23691d75 383
721c4181 384 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 385
89bc500e
GP		 386 chan->state = BT_OPEN;
387
71ba0e56
GP		 388 atomic_set(&chan->refcnt, 1);
389
eef1d9b6 390 BT_DBG("chan %p", chan);
abc545b8 391
48454079
GP		 392 return chan;
393}
394
23691d75 395void l2cap_chan_destroy(struct l2cap_chan *chan)
6ff5abbf 396{
333055f2 397 write_lock(&chan_list_lock);
23691d75 398 list_del(&chan->global_l);
333055f2 399 write_unlock(&chan_list_lock);
23691d75 400
371fd835 401 l2cap_chan_put(chan);
6ff5abbf
GP		 402}
403
bd4b1653
AE		 404void l2cap_chan_set_defaults(struct l2cap_chan *chan)
405{
406 chan->fcs = L2CAP_FCS_CRC16;
407 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
408 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
409 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
410 chan->sec_level = BT_SECURITY_LOW;
411
412 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
413}
414
14a28491 415static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 416{
af05b30b 417 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 418 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 419
9f5a0d7b 420 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 421
8c1d787b 422 chan->conn = conn;
0139418c 423
5491120e
AE		 424 switch (chan->chan_type) {
425 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b
VT		 426 if (conn->hcon->type == LE_LINK) {
427 /* LE connection */
0c1bc5c6 428 chan->omtu = L2CAP_LE_DEFAULT_MTU;
fe4128e0
GP		 429 chan->scid = L2CAP_CID_LE_DATA;
430 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 431 } else {
432 /* Alloc CID for connection-oriented socket */
fe4128e0 433 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 434 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 435 }
5491120e
AE		 436 break;
437
438 case L2CAP_CHAN_CONN_LESS:
0139418c 439 /* Connectionless socket */
fe4128e0
GP		 440 chan->scid = L2CAP_CID_CONN_LESS;
441 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 442 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 443 break;
444
445 default:
0139418c 446 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 447 chan->scid = L2CAP_CID_SIGNALING;
448 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 449 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 450 }
451
8f7975b1
AE		 452 chan->local_id = L2CAP_BESTEFFORT_ID;
453 chan->local_stype = L2CAP_SERV_BESTEFFORT;
454 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
455 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
456 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
457 chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO;
458
371fd835 459 l2cap_chan_hold(chan);
baa7e1fa 460
3df91ea2 461 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 462}
463
14a28491 464static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 465{
466 mutex_lock(&conn->chan_lock);
467 __l2cap_chan_add(conn, chan);
3df91ea2 468 mutex_unlock(&conn->chan_lock);
0139418c
MH		 469}
470
4519de9a 471static void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 472{
48454079 473 struct sock *sk = chan->sk;
8c1d787b 474 struct l2cap_conn *conn = chan->conn;
0139418c
MH		 475 struct sock *parent = bt_sk(sk)->parent;
476
c9b66675 477 __clear_chan_timer(chan);
0139418c 478
49208c9c 479 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 480
8e87d142 481 if (conn) {
baa7e1fa 482 /* Delete from channel list */
3df91ea2 483 list_del(&chan->list);
3d57dc68 484
371fd835 485 l2cap_chan_put(chan);
baa7e1fa 486
8c1d787b 487 chan->conn = NULL;
0139418c
MH		 488 hci_conn_put(conn->hcon);
489 }
490
6be36555
AE		 491 lock_sock(sk);
492
0e587be7 493 __l2cap_state_change(chan, BT_CLOSED);
0139418c
MH		 494 sock_set_flag(sk, SOCK_ZAPPED);
495
496 if (err)
2e0052e4 497 __l2cap_chan_set_err(chan, err);
0139418c
MH		 498
499 if (parent) {
500 bt_accept_unlink(sk);
501 parent->sk_data_ready(parent, 0);
502 } else
503 sk->sk_state_change(sk);
c13ffa62 504
6be36555
AE		 505 release_sock(sk);
506
c1360a1c
GP		 507 if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) &&
508 test_bit(CONF_INPUT_DONE, &chan->conf_state)))
6ff5abbf 509 return;
2ead70b8 510
58d35f87 511 skb_queue_purge(&chan->tx_q);
c13ffa62 512
0c1bc5c6 513 if (chan->mode == L2CAP_MODE_ERTM) {
c13ffa62
GP		 514 struct srej_list *l, *tmp;
515
1a09bcb9
GP		 516 __clear_retrans_timer(chan);
517 __clear_monitor_timer(chan);
518 __clear_ack_timer(chan);
c13ffa62 519
f1c6775b 520 skb_queue_purge(&chan->srej_q);
c13ffa62 521
3c588192
MM		 522 l2cap_seq_list_free(&chan->srej_list);
523 l2cap_seq_list_free(&chan->retrans_list);
39d5a3ee 524 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
c13ffa62
GP		 525 list_del(&l->list);
526 kfree(l);
527 }
528 }
0139418c
MH		 529}
530
4519de9a
GP		 531static void l2cap_chan_cleanup_listen(struct sock *parent)
532{
533 struct sock *sk;
534
535 BT_DBG("parent %p", parent);
536
537 /* Close not yet accepted channels */
0f852724 538 while ((sk = bt_accept_dequeue(parent, NULL))) {
ba3bd0ee 539 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
3df91ea2 540
6be36555 541 l2cap_chan_lock(chan);
c9b66675 542 __clear_chan_timer(chan);
ba3bd0ee 543 l2cap_chan_close(chan, ECONNRESET);
6be36555 544 l2cap_chan_unlock(chan);
3df91ea2 545
ba3bd0ee 546 chan->ops->close(chan->data);
0f852724 547 }
4519de9a
GP		 548}
549
0f852724 550void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 551{
552 struct l2cap_conn *conn = chan->conn;
553 struct sock *sk = chan->sk;
554
e05dcc32
AE		 555 BT_DBG("chan %p state %s sk %p", chan,
556 state_to_string(chan->state), sk);
4519de9a 557
89bc500e 558 switch (chan->state) {
4519de9a 559 case BT_LISTEN:
6be36555 560 lock_sock(sk);
4519de9a 561 l2cap_chan_cleanup_listen(sk);
89bc500e 562
0e587be7 563 __l2cap_state_change(chan, BT_CLOSED);
89bc500e 564 sock_set_flag(sk, SOCK_ZAPPED);
6be36555 565 release_sock(sk);
4519de9a
GP		 566 break;
567
568 case BT_CONNECTED:
569 case BT_CONFIG:
715ec005 570 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a 571 conn->hcon->type == ACL_LINK) {
c9b66675 572 __set_chan_timer(chan, sk->sk_sndtimeo);
4519de9a
GP		 573 l2cap_send_disconn_req(conn, chan, reason);
574 } else
575 l2cap_chan_del(chan, reason);
576 break;
577
578 case BT_CONNECT2:
715ec005 579 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a
GP		 580 conn->hcon->type == ACL_LINK) {
581 struct l2cap_conn_rsp rsp;
582 __u16 result;
583
584 if (bt_sk(sk)->defer_setup)
585 result = L2CAP_CR_SEC_BLOCK;
586 else
587 result = L2CAP_CR_BAD_PSM;
89bc500e 588 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 589
590 rsp.scid = cpu_to_le16(chan->dcid);
591 rsp.dcid = cpu_to_le16(chan->scid);
592 rsp.result = cpu_to_le16(result);
593 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
594 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
595 sizeof(rsp), &rsp);
596 }
597
598 l2cap_chan_del(chan, reason);
599 break;
600
601 case BT_CONNECT:
602 case BT_DISCONN:
603 l2cap_chan_del(chan, reason);
604 break;
605
606 default:
6be36555 607 lock_sock(sk);
4519de9a 608 sock_set_flag(sk, SOCK_ZAPPED);
6be36555 609 release_sock(sk);
4519de9a
GP		 610 break;
611 }
612}
613
4343478f 614static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 615{
715ec005 616 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 617 switch (chan->sec_level) {
8556edd3
JH		 618 case BT_SECURITY_HIGH:
619 return HCI_AT_DEDICATED_BONDING_MITM;
620 case BT_SECURITY_MEDIUM:
621 return HCI_AT_DEDICATED_BONDING;
622 default:
623 return HCI_AT_NO_BONDING;
624 }
fe4128e0 625 } else if (chan->psm == cpu_to_le16(0x0001)) {
4343478f
GP		 626 if (chan->sec_level == BT_SECURITY_LOW)
627 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 628
4343478f 629 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 630 return HCI_AT_NO_BONDING_MITM;
00ae4af9 631 else
8556edd3 632 return HCI_AT_NO_BONDING;
00ae4af9 633 } else {
4343478f 634 switch (chan->sec_level) {
00ae4af9 635 case BT_SECURITY_HIGH:
8556edd3 636 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 637 case BT_SECURITY_MEDIUM:
8556edd3 638 return HCI_AT_GENERAL_BONDING;
00ae4af9 639 default:
8556edd3 640 return HCI_AT_NO_BONDING;
00ae4af9 641 }
0684e5f9 642 }
8556edd3
JH		 643}
644
645/* Service level security */
d45fc423 646int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 647{
8c1d787b 648 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 649 __u8 auth_type;
650
4343478f 651 auth_type = l2cap_get_auth_type(chan);
79d554a6 652
4343478f 653 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 654}
655
b5ad8b7f 656static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 657{
658 u8 id;
659
660 /* Get next available identificator.
661 * 1 - 128 are used by kernel.
662 * 129 - 199 are reserved.
663 * 200 - 254 are used by utilities like l2ping, etc.
664 */
665
333055f2 666 spin_lock(&conn->lock);
4e8402a3
MH		 667
668 if (++conn->tx_ident > 128)
669 conn->tx_ident = 1;
670
671 id = conn->tx_ident;
672
333055f2 673 spin_unlock(&conn->lock);
4e8402a3
MH		 674
675 return id;
676}
677
4519de9a 678static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 679{
680 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 681 u8 flags;
4e8402a3
MH		 682
683 BT_DBG("code 0x%2.2x", code);
684
685 if (!skb)
9a9c6a34 686 return;
4e8402a3 687
e702112f
AE		 688 if (lmp_no_flush_capable(conn->hcon->hdev))
689 flags = ACL_START_NO_FLUSH;
690 else
691 flags = ACL_START;
692
14b12d0b 693 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 694 skb->priority = HCI_PRIO_MAX;
14b12d0b 695
73d80deb
LAD		 696 hci_send_acl(conn->hchan, skb, flags);
697}
698
699static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
700{
701 struct hci_conn *hcon = chan->conn->hcon;
702 u16 flags;
703
704 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
705 skb->priority);
706
707 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
708 lmp_no_flush_capable(hcon->hdev))
709 flags = ACL_START_NO_FLUSH;
710 else
711 flags = ACL_START;
14b12d0b 712
73d80deb
LAD		 713 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
714 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 715}
716
b76bbd66
MM		 717static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
718{
719 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
720 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
721
722 if (enh & L2CAP_CTRL_FRAME_TYPE) {
723 /* S-Frame */
724 control->sframe = 1;
725 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
726 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
727
728 control->sar = 0;
729 control->txseq = 0;
730 } else {
731 /* I-Frame */
732 control->sframe = 0;
733 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
734 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
735
736 control->poll = 0;
737 control->super = 0;
738 }
739}
740
b76bbd66
MM		 741static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
742{
743 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
744 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
745
746 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
747 /* S-Frame */
748 control->sframe = 1;
749 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
750 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
751
752 control->sar = 0;
753 control->txseq = 0;
754 } else {
755 /* I-Frame */
756 control->sframe = 0;
757 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
758 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
759
760 control->poll = 0;
761 control->super = 0;
762 }
763}
764
765static inline void __unpack_control(struct l2cap_chan *chan,
766 struct sk_buff *skb)
767{
768 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
769 __unpack_extended_control(get_unaligned_le32(skb->data),
770 &bt_cb(skb)->control);
771 } else {
772 __unpack_enhanced_control(get_unaligned_le16(skb->data),
773 &bt_cb(skb)->control);
774 }
775}
776
b5c6aaed
MM		 777static u32 __pack_extended_control(struct l2cap_ctrl *control)
778{
779 u32 packed;
780
781 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
782 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
783
784 if (control->sframe) {
785 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
786 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
787 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
788 } else {
789 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
790 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
791 }
792
793 return packed;
794}
795
796static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
797{
798 u16 packed;
799
800 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
801 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
802
803 if (control->sframe) {
804 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
805 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
806 packed |= L2CAP_CTRL_FRAME_TYPE;
807 } else {
808 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
809 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
810 }
811
812 return packed;
813}
814
b76bbd66
MM		 815static inline void __pack_control(struct l2cap_chan *chan,
816 struct l2cap_ctrl *control,
817 struct sk_buff *skb)
818{
819 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
820 put_unaligned_le32(__pack_extended_control(control),
821 skb->data + L2CAP_HDR_SIZE);
822 } else {
823 put_unaligned_le16(__pack_enhanced_control(control),
824 skb->data + L2CAP_HDR_SIZE);
825 }
826}
827
b5c6aaed
MM		 828static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control)
829{
830 struct sk_buff *skb;
831 struct l2cap_hdr *lh;
832 struct l2cap_conn *conn = chan->conn;
833 int count, hlen;
834
835 if (chan->state != BT_CONNECTED)
836 return;
837
838 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
839 hlen = L2CAP_EXT_HDR_SIZE;
840 else
841 hlen = L2CAP_ENH_HDR_SIZE;
842
843 if (chan->fcs == L2CAP_FCS_CRC16)
844 hlen += L2CAP_FCS_SIZE;
845
846 BT_DBG("chan %p, control 0x%8.8x", chan, control);
847
848 count = min_t(unsigned int, conn->mtu, hlen);
849
850 control |= __set_sframe(chan);
851
852 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
853 control |= __set_ctrl_final(chan);
854
855 if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state))
856 control |= __set_ctrl_poll(chan);
857
858 skb = bt_skb_alloc(count, GFP_ATOMIC);
859 if (!skb)
860 return;
861
862 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
863 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
864 lh->cid = cpu_to_le16(chan->dcid);
865
866 __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
867
868 if (chan->fcs == L2CAP_FCS_CRC16) {
869 u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE);
870 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
871 }
872
873 skb->priority = HCI_PRIO_MAX;
874 l2cap_do_send(chan, skb);
875}
876
877static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control)
878{
879 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
880 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
881 set_bit(CONN_RNR_SENT, &chan->conn_state);
882 } else
883 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
884
885 control |= __set_reqseq(chan, chan->buffer_seq);
886
887 l2cap_send_sframe(chan, control);
888}
889
b4450035 890static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 891{
c1360a1c 892 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 893}
894
9b27f350
AE		 895static void l2cap_send_conn_req(struct l2cap_chan *chan)
896{
897 struct l2cap_conn *conn = chan->conn;
898 struct l2cap_conn_req req;
899
900 req.scid = cpu_to_le16(chan->scid);
901 req.psm = chan->psm;
902
903 chan->ident = l2cap_get_ident(conn);
904
905 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
906
907 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
908}
909
9f0caeb1
VCG		 910static void l2cap_chan_ready(struct l2cap_chan *chan)
911{
912 struct sock *sk = chan->sk;
913 struct sock *parent;
914
915 lock_sock(sk);
916
917 parent = bt_sk(sk)->parent;
918
919 BT_DBG("sk %p, parent %p", sk, parent);
920
921 chan->conf_state = 0;
922 __clear_chan_timer(chan);
923
924 __l2cap_state_change(chan, BT_CONNECTED);
925 sk->sk_state_change(sk);
926
927 if (parent)
928 parent->sk_data_ready(parent, 0);
929
930 release_sock(sk);
931}
932
fc7f8a7e 933static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 934{
8c1d787b 935 struct l2cap_conn *conn = chan->conn;
79d554a6 936
9f0caeb1
VCG		 937 if (conn->hcon->type == LE_LINK) {
938 l2cap_chan_ready(chan);
939 return;
940 }
941
79d554a6 942 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 943 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
944 return;
945
d45fc423 946 if (l2cap_chan_check_security(chan) &&
9b27f350
AE		 947 __l2cap_no_conn_pending(chan))
948 l2cap_send_conn_req(chan);
79d554a6
MH		 949 } else {
950 struct l2cap_info_req req;
951 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
952
953 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
954 conn->info_ident = l2cap_get_ident(conn);
955
ba13ccd9 956 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6
MH		 957
958 l2cap_send_cmd(conn, conn->info_ident,
959 L2CAP_INFO_REQ, sizeof(req), &req);
960 }
961}
962
cf6c2c0b
GP		 963static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
964{
965 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 966 if (!disable_ertm)
cf6c2c0b
GP		 967 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
968
969 switch (mode) {
970 case L2CAP_MODE_ERTM:
971 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
972 case L2CAP_MODE_STREAMING:
973 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
974 default:
975 return 0x00;
976 }
977}
978
4519de9a 979static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
22121fc9 980{
6be36555 981 struct sock *sk = chan->sk;
22121fc9
GP		 982 struct l2cap_disconn_req req;
983
c13ffa62
GP		 984 if (!conn)
985 return;
986
0c1bc5c6 987 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 988 __clear_retrans_timer(chan);
989 __clear_monitor_timer(chan);
990 __clear_ack_timer(chan);
c13ffa62
GP		 991 }
992
fe4128e0
GP		 993 req.dcid = cpu_to_le16(chan->dcid);
994 req.scid = cpu_to_le16(chan->scid);
22121fc9
GP		 995 l2cap_send_cmd(conn, l2cap_get_ident(conn),
996 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62 997
6be36555 998 lock_sock(sk);
0e587be7 999 __l2cap_state_change(chan, BT_DISCONN);
2e0052e4 1000 __l2cap_chan_set_err(chan, err);
6be36555 1001 release_sock(sk);
22121fc9
GP		 1002}
1003
1da177e4 1004/* ---- L2CAP connections ---- */
4e8402a3
MH		 1005static void l2cap_conn_start(struct l2cap_conn *conn)
1006{
3df91ea2 1007 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1008
1009 BT_DBG("conn %p", conn);
1010
3df91ea2 1011 mutex_lock(&conn->chan_lock);
4e8402a3 1012
3df91ea2 1013 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 1014 struct sock *sk = chan->sk;
baa7e1fa 1015
6be36555 1016 l2cap_chan_lock(chan);
4e8402a3 1017
715ec005 1018 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1019 l2cap_chan_unlock(chan);
79d554a6
MH		 1020 continue;
1021 }
1022
89bc500e 1023 if (chan->state == BT_CONNECT) {
d45fc423 1024 if (!l2cap_chan_check_security(chan) ||
b4450035 1025 !__l2cap_no_conn_pending(chan)) {
6be36555 1026 l2cap_chan_unlock(chan);
47731de7
GP		 1027 continue;
1028 }
79d554a6 1029
c1360a1c
GP		 1030 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1031 && test_bit(CONF_STATE2_DEVICE,
1032 &chan->conf_state)) {
89bc500e 1033 l2cap_chan_close(chan, ECONNRESET);
6be36555 1034 l2cap_chan_unlock(chan);
47731de7 1035 continue;
b1235d79 1036 }
47731de7 1037
9b27f350 1038 l2cap_send_conn_req(chan);
47731de7 1039
89bc500e 1040 } else if (chan->state == BT_CONNECT2) {
79d554a6 1041 struct l2cap_conn_rsp rsp;
e9aeb2dd 1042 char buf[128];
fe4128e0
GP		 1043 rsp.scid = cpu_to_le16(chan->dcid);
1044 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1045
d45fc423 1046 if (l2cap_chan_check_security(chan)) {
6be36555 1047 lock_sock(sk);
f66dc81f
MH		 1048 if (bt_sk(sk)->defer_setup) {
1049 struct sock *parent = bt_sk(sk)->parent;
1050 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1051 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
05e9a2f6
IK		 1052 if (parent)
1053 parent->sk_data_ready(parent, 0);
f66dc81f
MH		 1054
1055 } else {
0e587be7 1056 __l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 1057 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1058 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1059 }
6be36555 1060 release_sock(sk);
79d554a6
MH		 1061 } else {
1062 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1063 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
1064 }
1065
fc7f8a7e
GP		 1066 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1067 sizeof(rsp), &rsp);
e9aeb2dd 1068
c1360a1c 1069 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
e9aeb2dd 1070 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1071 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1072 continue;
1073 }
1074
c1360a1c 1075 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1076 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 1077 l2cap_build_conf_req(chan, buf), buf);
1078 chan->num_conf_req++;
4e8402a3
MH		 1079 }
1080
6be36555 1081 l2cap_chan_unlock(chan);
4e8402a3
MH		 1082 }
1083
3df91ea2 1084 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1085}
1086
c2287681 1087/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1088 * Returns closest match, locked.
1089 */
d9b88702 1090static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1091 bdaddr_t *src,
1092 bdaddr_t *dst)
b62f328b 1093{
23691d75 1094 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1095
23691d75 1096 read_lock(&chan_list_lock);
b62f328b 1097
23691d75
GP		 1098 list_for_each_entry(c, &chan_list, global_l) {
1099 struct sock *sk = c->sk;
fe4128e0 1100
89bc500e 1101 if (state && c->state != state)
b62f328b
VT		 1102 continue;
1103
23691d75 1104 if (c->scid == cid) {
c2287681
IY		 1105 int src_match, dst_match;
1106 int src_any, dst_any;
1107
b62f328b 1108 /* Exact match. */
c2287681
IY		 1109 src_match = !bacmp(&bt_sk(sk)->src, src);
1110 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1111 if (src_match && dst_match) {
23691d75
GP		 1112 read_unlock(&chan_list_lock);
1113 return c;
1114 }
b62f328b
VT		 1115
1116 /* Closest match */
c2287681
IY		 1117 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1118 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1119 if ((src_match && dst_any) || (src_any && dst_match) ||
1120 (src_any && dst_any))
23691d75 1121 c1 = c;
b62f328b
VT		 1122 }
1123 }
280f294f 1124
23691d75 1125 read_unlock(&chan_list_lock);
b62f328b 1126
23691d75 1127 return c1;
b62f328b
VT		 1128}
1129
1130static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1131{
c916fbe4 1132 struct sock *parent, *sk;
23691d75 1133 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 1134
1135 BT_DBG("");
1136
1137 /* Check if we have socket listening on cid */
23691d75 1138 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
c2287681 1139 conn->src, conn->dst);
23691d75 1140 if (!pchan)
b62f328b
VT		 1141 return;
1142
23691d75
GP		 1143 parent = pchan->sk;
1144
aa2ac881 1145 lock_sock(parent);
62f3a2cf 1146
b62f328b
VT		 1147 /* Check for backlog size */
1148 if (sk_acceptq_is_full(parent)) {
1149 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1150 goto clean;
1151 }
1152
80808e43
GP		 1153 chan = pchan->ops->new_connection(pchan->data);
1154 if (!chan)
b62f328b
VT		 1155 goto clean;
1156
80808e43 1157 sk = chan->sk;
5d41ce1d 1158
b62f328b
VT		 1159 hci_conn_hold(conn->hcon);
1160
b62f328b
VT		 1161 bacpy(&bt_sk(sk)->src, conn->src);
1162 bacpy(&bt_sk(sk)->dst, conn->dst);
1163
d1010240
GP		 1164 bt_accept_enqueue(parent, sk);
1165
3d57dc68 1166 l2cap_chan_add(conn, chan);
48454079 1167
c9b66675 1168 __set_chan_timer(chan, sk->sk_sndtimeo);
b62f328b 1169
0e587be7 1170 __l2cap_state_change(chan, BT_CONNECTED);
b62f328b
VT		 1171 parent->sk_data_ready(parent, 0);
1172
b62f328b 1173clean:
aa2ac881 1174 release_sock(parent);
b62f328b
VT		 1175}
1176
4e8402a3
MH		 1177static void l2cap_conn_ready(struct l2cap_conn *conn)
1178{
48454079 1179 struct l2cap_chan *chan;
4e8402a3 1180
79d554a6 1181 BT_DBG("conn %p", conn);
4e8402a3 1182
b62f328b
VT		 1183 if (!conn->hcon->out && conn->hcon->type == LE_LINK)
1184 l2cap_le_conn_ready(conn);
1185
160dc6ac
VCG		 1186 if (conn->hcon->out && conn->hcon->type == LE_LINK)
1187 smp_conn_security(conn, conn->hcon->pending_sec_level);
1188
3df91ea2 1189 mutex_lock(&conn->chan_lock);
4e8402a3 1190
3df91ea2 1191 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1192
6be36555 1193 l2cap_chan_lock(chan);
4e8402a3 1194
63128451 1195 if (conn->hcon->type == LE_LINK) {
b501d6a1 1196 if (smp_conn_security(conn, chan->sec_level))
cf4cd009 1197 l2cap_chan_ready(chan);
acd7d370 1198
63128451 1199 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1200 struct sock *sk = chan->sk;
c9b66675 1201 __clear_chan_timer(chan);
6be36555 1202 lock_sock(sk);
0e587be7 1203 __l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1204 sk->sk_state_change(sk);
6be36555 1205 release_sock(sk);
b501d6a1 1206
89bc500e 1207 } else if (chan->state == BT_CONNECT)
fc7f8a7e 1208 l2cap_do_start(chan);
4e8402a3 1209
6be36555 1210 l2cap_chan_unlock(chan);
4e8402a3 1211 }
79d554a6 1212
3df91ea2 1213 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1214}
1215
1216/* Notify sockets that we cannot guaranty reliability anymore */
1217static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1218{
48454079 1219 struct l2cap_chan *chan;
4e8402a3
MH		 1220
1221 BT_DBG("conn %p", conn);
1222
3df91ea2 1223 mutex_lock(&conn->chan_lock);
4e8402a3 1224
3df91ea2 1225 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1226 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
2e0052e4 1227 __l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1228 }
1229
3df91ea2 1230 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1231}
1232
f878fcad 1233static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1234{
f878fcad 1235 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
030013d8 1236 info_timer.work);
4e8402a3 1237
984947dc 1238 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1239 conn->info_ident = 0;
984947dc 1240
4e8402a3
MH		 1241 l2cap_conn_start(conn);
1242}
1243
5d3de7df
VCG		 1244static void l2cap_conn_del(struct hci_conn *hcon, int err)
1245{
1246 struct l2cap_conn *conn = hcon->l2cap_data;
1247 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1248
1249 if (!conn)
1250 return;
1251
1252 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1253
1254 kfree_skb(conn->rx_skb);
1255
3df91ea2
AE		 1256 mutex_lock(&conn->chan_lock);
1257
5d3de7df
VCG		 1258 /* Kill channels */
1259 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1260 l2cap_chan_hold(chan);
6be36555
AE		 1261 l2cap_chan_lock(chan);
1262
5d3de7df 1263 l2cap_chan_del(chan, err);
6be36555
AE		 1264
1265 l2cap_chan_unlock(chan);
1266
5d3de7df 1267 chan->ops->close(chan->data);
61d6ef3e 1268 l2cap_chan_put(chan);
5d3de7df
VCG		 1269 }
1270
3df91ea2
AE		 1271 mutex_unlock(&conn->chan_lock);
1272
73d80deb
LAD		 1273 hci_chan_del(conn->hchan);
1274
5d3de7df 1275 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1276 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1277
51a8efd7 1278 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1279 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1280 smp_chan_destroy(conn);
d26a2345 1281 }
5d3de7df
VCG		 1282
1283 hcon->l2cap_data = NULL;
1284 kfree(conn);
1285}
1286
6c9d42a1 1287static void security_timeout(struct work_struct *work)
5d3de7df 1288{
6c9d42a1
GP		 1289 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1290 security_timer.work);
5d3de7df
VCG		 1291
1292 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1293}
1294
1da177e4
LT		 1295static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1296{
0139418c 1297 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1298 struct hci_chan *hchan;
1da177e4 1299
0139418c 1300 if (conn || status)
1da177e4
LT		 1301 return conn;
1302
73d80deb
LAD		 1303 hchan = hci_chan_create(hcon);
1304 if (!hchan)
1305 return NULL;
1306
0139418c 1307 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
73d80deb
LAD		 1308 if (!conn) {
1309 hci_chan_del(hchan);
1da177e4 1310 return NULL;
73d80deb 1311 }
1da177e4
LT		 1312
1313 hcon->l2cap_data = conn;
1314 conn->hcon = hcon;
73d80deb 1315 conn->hchan = hchan;
1da177e4 1316
73d80deb 1317 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1318
acd7d370
VT		 1319 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
1320 conn->mtu = hcon->hdev->le_mtu;
1321 else
1322 conn->mtu = hcon->hdev->acl_mtu;
1323
1da177e4
LT		 1324 conn->src = &hcon->hdev->bdaddr;
1325 conn->dst = &hcon->dst;
1326
4e8402a3
MH		 1327 conn->feat_mask = 0;
1328
1da177e4 1329 spin_lock_init(&conn->lock);
3df91ea2 1330 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1331
1332 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1333
5d3de7df 1334 if (hcon->type == LE_LINK)
6c9d42a1 1335 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1336 else
030013d8 1337 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1338
9f5a0d7b 1339 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1340
1da177e4
LT		 1341 return conn;
1342}
1343
1da177e4 1344/* ---- Socket interface ---- */
1da177e4 1345
c2287681 1346/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1347 * Returns closest match.
1348 */
c2287681
IY		 1349static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1350 bdaddr_t *src,
1351 bdaddr_t *dst)
1da177e4 1352{
23691d75 1353 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1354
23691d75 1355 read_lock(&chan_list_lock);
e0f0cb56 1356
23691d75
GP		 1357 list_for_each_entry(c, &chan_list, global_l) {
1358 struct sock *sk = c->sk;
fe4128e0 1359
89bc500e 1360 if (state && c->state != state)
1da177e4
LT		 1361 continue;
1362
23691d75 1363 if (c->psm == psm) {
c2287681
IY		 1364 int src_match, dst_match;
1365 int src_any, dst_any;
1366
1da177e4 1367 /* Exact match. */
c2287681
IY		 1368 src_match = !bacmp(&bt_sk(sk)->src, src);
1369 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1370 if (src_match && dst_match) {
a7567b20 1371 read_unlock(&chan_list_lock);
23691d75
GP		 1372 return c;
1373 }
1da177e4
LT		 1374
1375 /* Closest match */
c2287681
IY		 1376 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1377 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1378 if ((src_match && dst_any) || (src_any && dst_match) ||
1379 (src_any && dst_any))
23691d75 1380 c1 = c;
1da177e4
LT		 1381 }
1382 }
1da177e4 1383
23691d75 1384 read_unlock(&chan_list_lock);
e0f0cb56 1385
23691d75 1386 return c1;
1da177e4
LT		 1387}
1388
8e9f9892
AG		 1389int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1390 bdaddr_t *dst, u8 dst_type)
1da177e4 1391{
5d41ce1d 1392 struct sock *sk = chan->sk;
1da177e4 1393 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1394 struct l2cap_conn *conn;
1395 struct hci_conn *hcon;
1396 struct hci_dev *hdev;
09ab6f4c 1397 __u8 auth_type;
44d0e48e 1398 int err;
1da177e4 1399
8e9f9892
AG		 1400 BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst),
1401 dst_type, __le16_to_cpu(chan->psm));
1da177e4 1402
af05b30b
GP		 1403 hdev = hci_get_route(dst, src);
1404 if (!hdev)
1da177e4
LT		 1405 return -EHOSTUNREACH;
1406
09fd0de5 1407 hci_dev_lock(hdev);
1da177e4 1408
6be36555 1409 l2cap_chan_lock(chan);
03a00194
GP		 1410
1411 /* PSM must be odd and lsb of upper byte must be 0 */
1412 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1413 chan->chan_type != L2CAP_CHAN_RAW) {
1414 err = -EINVAL;
1415 goto done;
1416 }
1417
1418 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1419 err = -EINVAL;
1420 goto done;
1421 }
1422
1423 switch (chan->mode) {
1424 case L2CAP_MODE_BASIC:
1425 break;
1426 case L2CAP_MODE_ERTM:
1427 case L2CAP_MODE_STREAMING:
1428 if (!disable_ertm)
1429 break;
1430 /* fall through */
1431 default:
1432 err = -ENOTSUPP;
1433 goto done;
1434 }
1435
6be36555
AE		 1436 lock_sock(sk);
1437
03a00194
GP		 1438 switch (sk->sk_state) {
1439 case BT_CONNECT:
1440 case BT_CONNECT2:
1441 case BT_CONFIG:
1442 /* Already connecting */
1443 err = 0;
6be36555 1444 release_sock(sk);
03a00194
GP		 1445 goto done;
1446
1447 case BT_CONNECTED:
1448 /* Already connected */
1449 err = -EISCONN;
6be36555 1450 release_sock(sk);
03a00194
GP		 1451 goto done;
1452
1453 case BT_OPEN:
1454 case BT_BOUND:
1455 /* Can connect */
1456 break;
1457
1458 default:
1459 err = -EBADFD;
6be36555 1460 release_sock(sk);
03a00194
GP		 1461 goto done;
1462 }
1463
1464 /* Set destination address and psm */
9219b2a0 1465 bacpy(&bt_sk(sk)->dst, dst);
6be36555
AE		 1466
1467 release_sock(sk);
1468
03a00194
GP		 1469 chan->psm = psm;
1470 chan->dcid = cid;
1da177e4 1471
4343478f 1472 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1473
fe4128e0 1474 if (chan->dcid == L2CAP_CID_LE_DATA)
8e9f9892 1475 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1476 chan->sec_level, auth_type);
acd7d370 1477 else
8e9f9892 1478 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1479 chan->sec_level, auth_type);
acd7d370 1480
30e76272
VT		 1481 if (IS_ERR(hcon)) {
1482 err = PTR_ERR(hcon);
1da177e4 1483 goto done;
30e76272 1484 }
1da177e4
LT		 1485
1486 conn = l2cap_conn_add(hcon, 0);
1487 if (!conn) {
1488 hci_conn_put(hcon);
30e76272 1489 err = -ENOMEM;
1da177e4
LT		 1490 goto done;
1491 }
1492
9f0caeb1
VCG		 1493 if (hcon->type == LE_LINK) {
1494 err = 0;
1495
1496 if (!list_empty(&conn->chan_l)) {
1497 err = -EBUSY;
1498 hci_conn_put(hcon);
1499 }
1500
1501 if (err)
1502 goto done;
1503 }
1504
1da177e4
LT		 1505 /* Update source addr of the socket */
1506 bacpy(src, conn->src);
1507
6be36555 1508 l2cap_chan_unlock(chan);
48454079 1509 l2cap_chan_add(conn, chan);
6be36555 1510 l2cap_chan_lock(chan);
48454079 1511
6be36555 1512 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1513 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1514
1515 if (hcon->state == BT_CONNECTED) {
715ec005 1516 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1517 __clear_chan_timer(chan);
d45fc423 1518 if (l2cap_chan_check_security(chan))
6be36555 1519 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1520 } else
fc7f8a7e 1521 l2cap_do_start(chan);
1da177e4
LT		 1522 }
1523
30e76272
VT		 1524 err = 0;
1525
1da177e4 1526done:
6be36555 1527 l2cap_chan_unlock(chan);
09fd0de5 1528 hci_dev_unlock(hdev);
1da177e4
LT		 1529 hci_dev_put(hdev);
1530 return err;
1531}
1532
dcba0dba 1533int __l2cap_wait_ack(struct sock *sk)
6161c038 1534{
8c1d787b 1535 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1536 DECLARE_WAITQUEUE(wait, current);
1537 int err = 0;
1538 int timeo = HZ/5;
1539
2b0b05dd 1540 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1541 set_current_state(TASK_INTERRUPTIBLE);
1542 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1543 if (!timeo)
1544 timeo = HZ/5;
1545
1546 if (signal_pending(current)) {
1547 err = sock_intr_errno(timeo);
1548 break;
1549 }
1550
1551 release_sock(sk);
1552 timeo = schedule_timeout(timeo);
1553 lock_sock(sk);
a71a0cf4 1554 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1555
1556 err = sock_error(sk);
1557 if (err)
1558 break;
1559 }
1560 set_current_state(TASK_RUNNING);
2b0b05dd 1561 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1562 return err;
1563}
1564
721c4181 1565static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1566{
721c4181
GP		 1567 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1568 monitor_timer.work);
e90bac06 1569
525cd185 1570 BT_DBG("chan %p", chan);
0e98958d 1571
6be36555
AE		 1572 l2cap_chan_lock(chan);
1573
2c03a7a4 1574 if (chan->retry_count >= chan->remote_max_tx) {
8c1d787b 1575 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
6be36555 1576 l2cap_chan_unlock(chan);
8d7e1c7f 1577 l2cap_chan_put(chan);
e90bac06
GP		 1578 return;
1579 }
1580
6a026610 1581 chan->retry_count++;
1a09bcb9 1582 __set_monitor_timer(chan);
e90bac06 1583
525cd185 1584 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
6be36555 1585 l2cap_chan_unlock(chan);
8d7e1c7f 1586 l2cap_chan_put(chan);
e90bac06
GP		 1587}
1588
721c4181 1589static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1590{
721c4181
GP		 1591 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1592 retrans_timer.work);
e90bac06 1593
49208c9c 1594 BT_DBG("chan %p", chan);
0e98958d 1595
6be36555
AE		 1596 l2cap_chan_lock(chan);
1597
6a026610 1598 chan->retry_count = 1;
1a09bcb9 1599 __set_monitor_timer(chan);
e90bac06 1600
e2ab4353 1601 set_bit(CONN_WAIT_F, &chan->conn_state);
e90bac06 1602
525cd185 1603 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
6be36555
AE		 1604
1605 l2cap_chan_unlock(chan);
8d7e1c7f 1606 l2cap_chan_put(chan);
e90bac06
GP		 1607}
1608
42e5c802 1609static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
1da177e4 1610{
1c2acffb 1611 struct sk_buff *skb;
1da177e4 1612
58d35f87 1613 while ((skb = skb_peek(&chan->tx_q)) &&
6a026610 1614 chan->unacked_frames) {
3ce3514f 1615 if (bt_cb(skb)->control.txseq == chan->expected_ack_seq)
1c2acffb 1616 break;
1da177e4 1617
58d35f87 1618 skb = skb_dequeue(&chan->tx_q);
1c2acffb 1619 kfree_skb(skb);
1da177e4 1620
6a026610 1621 chan->unacked_frames--;
1c2acffb 1622 }
1da177e4 1623
6a026610 1624 if (!chan->unacked_frames)
1a09bcb9 1625 __clear_retrans_timer(chan);
1c2acffb 1626}
1da177e4 1627
67c9e840 1628static void l2cap_streaming_send(struct l2cap_chan *chan)
6840ed07 1629{
ccbb84af 1630 struct sk_buff *skb;
88843ab0
AE		 1631 u32 control;
1632 u16 fcs;
6840ed07 1633
58d35f87 1634 while ((skb = skb_dequeue(&chan->tx_q))) {
88843ab0 1635 control = __get_control(chan, skb->data + L2CAP_HDR_SIZE);
fb45de7d 1636 control |= __set_txseq(chan, chan->next_tx_seq);
94122bbe 1637 control |= __set_ctrl_sar(chan, bt_cb(skb)->control.sar);
88843ab0 1638 __put_control(chan, control, skb->data + L2CAP_HDR_SIZE);
6840ed07 1639
47d1ec61 1640 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1641 fcs = crc16(0, (u8 *)skb->data,
1642 skb->len - L2CAP_FCS_SIZE);
1643 put_unaligned_le16(fcs,
1644 skb->data + skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 1645 }
1646
4343478f 1647 l2cap_do_send(chan, skb);
6840ed07 1648
836be934 1649 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
6840ed07 1650 }
6840ed07
GP		 1651}
1652
fb45de7d 1653static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 1654{
8f17154f 1655 struct sk_buff *skb, *tx_skb;
88843ab0
AE		 1656 u16 fcs;
1657 u32 control;
8f17154f 1658
58d35f87 1659 skb = skb_peek(&chan->tx_q);
f11d676d
GP		 1660 if (!skb)
1661 return;
8f17154f 1662
3ce3514f 1663 while (bt_cb(skb)->control.txseq != tx_seq) {
58d35f87 1664 if (skb_queue_is_last(&chan->tx_q, skb))
f11d676d 1665 return;
8f17154f 1666
d1726b6d
SJ		 1667 skb = skb_queue_next(&chan->tx_q, skb);
1668 }
8f17154f 1669
3ce3514f
MM		 1670 if (bt_cb(skb)->control.retries == chan->remote_max_tx &&
1671 chan->remote_max_tx) {
8c1d787b 1672 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
f11d676d
GP		 1673 return;
1674 }
1675
1676 tx_skb = skb_clone(skb, GFP_ATOMIC);
3ce3514f 1677 bt_cb(skb)->control.retries++;
88843ab0
AE		 1678
1679 control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
7e0ef6ee 1680 control &= __get_sar_mask(chan);
3cb123d1 1681
e2ab4353 1682 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
03f6715d 1683 control |= __set_ctrl_final(chan);
95ffa978 1684
0b209fae 1685 control |= __set_reqseq(chan, chan->buffer_seq);
fb45de7d 1686 control |= __set_txseq(chan, tx_seq);
3cb123d1 1687
88843ab0 1688 __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
f11d676d 1689
47d1ec61 1690 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1691 fcs = crc16(0, (u8 *)tx_skb->data,
1692 tx_skb->len - L2CAP_FCS_SIZE);
1693 put_unaligned_le16(fcs,
1694 tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE);
f11d676d
GP		 1695 }
1696
4343478f 1697 l2cap_do_send(chan, tx_skb);
8f17154f
GP		 1698}
1699
67c9e840 1700static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1701{
1702 struct sk_buff *skb, *tx_skb;
88843ab0
AE		 1703 u16 fcs;
1704 u32 control;
9a9c6a34 1705 int nsent = 0;
1c2acffb 1706
89bc500e 1707 if (chan->state != BT_CONNECTED)
c13ffa62 1708 return -ENOTCONN;
e90bac06 1709
94122bbe
MM		 1710 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1711 return 0;
1712
58d35f87 1713 while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
1c2acffb 1714
3ce3514f
MM		 1715 if (bt_cb(skb)->control.retries == chan->remote_max_tx &&
1716 chan->remote_max_tx) {
8c1d787b 1717 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
e90bac06
GP		 1718 break;
1719 }
1720
e420aba3
AE		 1721 tx_skb = skb_clone(skb, GFP_ATOMIC);
1722
3ce3514f 1723 bt_cb(skb)->control.retries++;
e90bac06 1724
88843ab0 1725 control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
7e0ef6ee 1726 control &= __get_sar_mask(chan);
95ffa978 1727
e2ab4353 1728 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
03f6715d 1729 control |= __set_ctrl_final(chan);
e2ab4353 1730
0b209fae 1731 control |= __set_reqseq(chan, chan->buffer_seq);
fb45de7d 1732 control |= __set_txseq(chan, chan->next_tx_seq);
94122bbe 1733 control |= __set_ctrl_sar(chan, bt_cb(skb)->control.sar);
1c2acffb 1734
88843ab0 1735 __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
e90bac06 1736
47d1ec61 1737 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1738 fcs = crc16(0, (u8 *)skb->data,
1739 tx_skb->len - L2CAP_FCS_SIZE);
1740 put_unaligned_le16(fcs, skb->data +
1741 tx_skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 1742 }
1743
4343478f 1744 l2cap_do_send(chan, tx_skb);
9a9c6a34 1745
1a09bcb9 1746 __set_retrans_timer(chan);
1c2acffb 1747
3ce3514f 1748 bt_cb(skb)->control.txseq = chan->next_tx_seq;
836be934
AE		 1749
1750 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1c2acffb 1751
3ce3514f 1752 if (bt_cb(skb)->control.retries == 1) {
6a026610 1753 chan->unacked_frames++;
930fa4ae
SJ		 1754
1755 if (!nsent++)
1756 __clear_ack_timer(chan);
8ed7a0ae 1757 }
23e9fde2 1758
6a026610 1759 chan->frames_sent++;
1c2acffb 1760
58d35f87
GP		 1761 if (skb_queue_is_last(&chan->tx_q, skb))
1762 chan->tx_send_head = NULL;
1c2acffb 1763 else
58d35f87 1764 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
1c2acffb
GP		 1765 }
1766
9e917af1
GP		 1767 return nsent;
1768}
1769
525cd185 1770static int l2cap_retransmit_frames(struct l2cap_chan *chan)
dfc909be 1771{
dfc909be
GP		 1772 int ret;
1773
58d35f87
GP		 1774 if (!skb_queue_empty(&chan->tx_q))
1775 chan->tx_send_head = chan->tx_q.next;
dfc909be 1776
42e5c802 1777 chan->next_tx_seq = chan->expected_ack_seq;
525cd185 1778 ret = l2cap_ertm_send(chan);
dfc909be
GP		 1779 return ret;
1780}
1781
b17e73bb 1782static void __l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 1783{
88843ab0 1784 u32 control = 0;
9e917af1 1785
0b209fae 1786 control |= __set_reqseq(chan, chan->buffer_seq);
9e917af1 1787
e2ab4353 1788 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 1789 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
e2ab4353 1790 set_bit(CONN_RNR_SENT, &chan->conn_state);
525cd185 1791 l2cap_send_sframe(chan, control);
9a9c6a34 1792 return;
9e917af1 1793 }
dfc909be 1794
525cd185 1795 if (l2cap_ertm_send(chan) > 0)
dfc909be
GP		 1796 return;
1797
ab784b73 1798 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 1799 l2cap_send_sframe(chan, control);
1c2acffb
GP		 1800}
1801
b17e73bb
SJ		 1802static void l2cap_send_ack(struct l2cap_chan *chan)
1803{
1804 __clear_ack_timer(chan);
1805 __l2cap_send_ack(chan);
1806}
1807
525cd185 1808static void l2cap_send_srejtail(struct l2cap_chan *chan)
99b0d4b7
GP		 1809{
1810 struct srej_list *tail;
88843ab0 1811 u32 control;
99b0d4b7 1812
ab784b73 1813 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
03f6715d 1814 control |= __set_ctrl_final(chan);
99b0d4b7 1815
39d5a3ee 1816 tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
0b209fae 1817 control |= __set_reqseq(chan, tail->tx_seq);
99b0d4b7 1818
525cd185 1819 l2cap_send_sframe(chan, control);
99b0d4b7
GP		 1820}
1821
04124681
GP		 1822static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
1823 struct msghdr *msg, int len,
1824 int count, struct sk_buff *skb)
1c2acffb 1825{
0952a57a 1826 struct l2cap_conn *conn = chan->conn;
1c2acffb 1827 struct sk_buff **frag;
90338947 1828 int sent = 0;
1da177e4 1829
59203a21 1830 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1831 return -EFAULT;
1da177e4
LT		 1832
1833 sent += count;
1834 len -= count;
1835
1836 /* Continuation fragments (no L2CAP header) */
1837 frag = &skb_shinfo(skb)->frag_list;
1838 while (len) {
1839 count = min_t(unsigned int, conn->mtu, len);
1840
2f7719ce 1841 *frag = chan->ops->alloc_skb(chan, count,
90338947 1842 msg->msg_flags & MSG_DONTWAIT);
2f7719ce 1843
90338947
GP		 1844 if (IS_ERR(*frag))
1845 return PTR_ERR(*frag);
1c2acffb
GP		 1846 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1847 return -EFAULT;
1da177e4 1848
5e59b791
LAD		 1849 (*frag)->priority = skb->priority;
1850
1da177e4
LT		 1851 sent += count;
1852 len -= count;
1853
1854 frag = &(*frag)->next;
1855 }
1da177e4
LT		 1856
1857 return sent;
1c2acffb 1858}
1da177e4 1859
5e59b791
LAD		 1860static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
1861 struct msghdr *msg, size_t len,
1862 u32 priority)
1c2acffb 1863{
8c1d787b 1864 struct l2cap_conn *conn = chan->conn;
1c2acffb 1865 struct sk_buff *skb;
03a51213 1866 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 1867 struct l2cap_hdr *lh;
1868
6d5922b0 1869 BT_DBG("chan %p len %d priority %u", chan, (int)len, priority);
1c2acffb
GP		 1870
1871 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 1872
1873 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 1874 msg->msg_flags & MSG_DONTWAIT);
1875 if (IS_ERR(skb))
1876 return skb;
1c2acffb 1877
5e59b791
LAD		 1878 skb->priority = priority;
1879
1c2acffb
GP		 1880 /* Create L2CAP header */
1881 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1882 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c
AE		 1883 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
1884 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 1885
0952a57a 1886 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 1887 if (unlikely(err < 0)) {
1888 kfree_skb(skb);
1889 return ERR_PTR(err);
1890 }
1891 return skb;
1892}
1893
5e59b791
LAD		 1894static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
1895 struct msghdr *msg, size_t len,
1896 u32 priority)
1c2acffb 1897{
8c1d787b 1898 struct l2cap_conn *conn = chan->conn;
1c2acffb 1899 struct sk_buff *skb;
f2ba7fae 1900 int err, count;
1c2acffb
GP		 1901 struct l2cap_hdr *lh;
1902
6d5922b0 1903 BT_DBG("chan %p len %d", chan, (int)len);
1c2acffb 1904
f2ba7fae 1905 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 1906
f2ba7fae 1907 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 1908 msg->msg_flags & MSG_DONTWAIT);
1909 if (IS_ERR(skb))
1910 return skb;
1c2acffb 1911
5e59b791
LAD		 1912 skb->priority = priority;
1913
1c2acffb
GP		 1914 /* Create L2CAP header */
1915 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1916 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 1917 lh->len = cpu_to_le16(len);
1c2acffb 1918
0952a57a 1919 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 1920 if (unlikely(err < 0)) {
1921 kfree_skb(skb);
1922 return ERR_PTR(err);
1923 }
1924 return skb;
1925}
1926
ab0ff76d
LAD		 1927static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
1928 struct msghdr *msg, size_t len,
94122bbe 1929 u16 sdulen)
1c2acffb 1930{
8c1d787b 1931 struct l2cap_conn *conn = chan->conn;
1c2acffb 1932 struct sk_buff *skb;
e4ca6d98 1933 int err, count, hlen;
1c2acffb
GP		 1934 struct l2cap_hdr *lh;
1935
6d5922b0 1936 BT_DBG("chan %p len %d", chan, (int)len);
1c2acffb 1937
0ee0d208
GP		 1938 if (!conn)
1939 return ERR_PTR(-ENOTCONN);
1940
e4ca6d98
AE		 1941 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1942 hlen = L2CAP_EXT_HDR_SIZE;
1943 else
1944 hlen = L2CAP_ENH_HDR_SIZE;
1945
c74e560c 1946 if (sdulen)
03a51213 1947 hlen += L2CAP_SDULEN_SIZE;
c74e560c 1948
47d1ec61 1949 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 1950 hlen += L2CAP_FCS_SIZE;
fcc203c3 1951
1c2acffb 1952 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 1953
1954 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 1955 msg->msg_flags & MSG_DONTWAIT);
1956 if (IS_ERR(skb))
1957 return skb;
1c2acffb
GP		 1958
1959 /* Create L2CAP header */
1960 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1961 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 1962 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 1963
94122bbe 1964 __put_control(chan, 0, skb_put(skb, __ctrl_size(chan)));
88843ab0 1965
c74e560c 1966 if (sdulen)
03a51213 1967 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 1968
0952a57a 1969 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 1970 if (unlikely(err < 0)) {
1971 kfree_skb(skb);
1972 return ERR_PTR(err);
1973 }
e90bac06 1974
47d1ec61 1975 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 1976 put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3 1977
3ce3514f 1978 bt_cb(skb)->control.retries = 0;
1c2acffb 1979 return skb;
1da177e4
LT		 1980}
1981
94122bbe
MM		 1982static int l2cap_segment_sdu(struct l2cap_chan *chan,
1983 struct sk_buff_head *seg_queue,
1984 struct msghdr *msg, size_t len)
c74e560c 1985{
c74e560c 1986 struct sk_buff *skb;
94122bbe
MM		 1987 u16 sdu_len;
1988 size_t pdu_len;
1989 int err = 0;
1990 u8 sar;
c74e560c 1991
94122bbe 1992 BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len);
c74e560c 1993
94122bbe
MM		 1994 /* It is critical that ERTM PDUs fit in a single HCI fragment,
1995 * so fragmented skbs are not used. The HCI layer's handling
1996 * of fragmented skbs is not compatible with ERTM's queueing.
1997 */
c74e560c 1998
94122bbe
MM		 1999 /* PDU size is derived from the HCI MTU */
2000 pdu_len = chan->conn->mtu;
c74e560c 2001
94122bbe
MM		 2002 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2003
2004 /* Adjust for largest possible L2CAP overhead. */
2005 pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE;
2006
2007 /* Remote device may have requested smaller PDUs */
2008 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2009
2010 if (len <= pdu_len) {
2011 sar = L2CAP_SAR_UNSEGMENTED;
2012 sdu_len = 0;
2013 pdu_len = len;
2014 } else {
2015 sar = L2CAP_SAR_START;
2016 sdu_len = len;
2017 pdu_len -= L2CAP_SDULEN_SIZE;
2018 }
2019
2020 while (len > 0) {
2021 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2022
c74e560c 2023 if (IS_ERR(skb)) {
94122bbe 2024 __skb_queue_purge(seg_queue);
c74e560c
GP		 2025 return PTR_ERR(skb);
2026 }
2027
94122bbe
MM		 2028 bt_cb(skb)->control.sar = sar;
2029 __skb_queue_tail(seg_queue, skb);
2030
2031 len -= pdu_len;
2032 if (sdu_len) {
2033 sdu_len = 0;
2034 pdu_len += L2CAP_SDULEN_SIZE;
2035 }
2036
2037 if (len <= pdu_len) {
2038 sar = L2CAP_SAR_END;
2039 pdu_len = len;
2040 } else {
2041 sar = L2CAP_SAR_CONTINUE;
2042 }
c74e560c 2043 }
c74e560c 2044
94122bbe 2045 return err;
c74e560c
GP		 2046}
2047
5e59b791
LAD		 2048int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2049 u32 priority)
9a91a04a 2050{
9a91a04a 2051 struct sk_buff *skb;
9a91a04a 2052 int err;
94122bbe 2053 struct sk_buff_head seg_queue;
9a91a04a
GP		 2054
2055 /* Connectionless channel */
715ec005 2056 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2057 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2058 if (IS_ERR(skb))
2059 return PTR_ERR(skb);
2060
2061 l2cap_do_send(chan, skb);
2062 return len;
2063 }
2064
2065 switch (chan->mode) {
2066 case L2CAP_MODE_BASIC:
2067 /* Check outgoing MTU */
2068 if (len > chan->omtu)
2069 return -EMSGSIZE;
2070
2071 /* Create a basic PDU */
5e59b791 2072 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2073 if (IS_ERR(skb))
2074 return PTR_ERR(skb);
2075
2076 l2cap_do_send(chan, skb);
2077 err = len;
2078 break;
2079
2080 case L2CAP_MODE_ERTM:
2081 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2082 /* Check outgoing MTU */
2083 if (len > chan->omtu) {
2084 err = -EMSGSIZE;
2085 break;
2086 }
9a91a04a 2087
94122bbe 2088 __skb_queue_head_init(&seg_queue);
9a91a04a 2089
94122bbe
MM		 2090 /* Do segmentation before calling in to the state machine,
2091 * since it's possible to block while waiting for memory
2092 * allocation.
2093 */
2094 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2095
94122bbe
MM		 2096 /* The channel could have been closed while segmenting,
2097 * check that it is still connected.
2098 */
2099 if (chan->state != BT_CONNECTED) {
2100 __skb_queue_purge(&seg_queue);
2101 err = -ENOTCONN;
9a91a04a
GP		 2102 }
2103
94122bbe 2104 if (err)
9a91a04a 2105 break;
9a91a04a 2106
94122bbe
MM		 2107 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2108 if (chan->mode == L2CAP_MODE_ERTM)
2109 err = l2cap_ertm_send(chan);
2110 else
2111 l2cap_streaming_send(chan);
9a91a04a 2112
9a91a04a
GP		 2113 if (err >= 0)
2114 err = len;
2115
94122bbe
MM		 2116 /* If the skbs were not queued for sending, they'll still be in
2117 * seg_queue and need to be purged.
2118 */
2119 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2120 break;
2121
2122 default:
2123 BT_DBG("bad state %1.1x", chan->mode);
2124 err = -EBADFD;
2125 }
2126
2127 return err;
2128}
2129
1da177e4
LT		 2130/* Copy frame to all raw sockets on that connection */
2131static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2132{
1da177e4 2133 struct sk_buff *nskb;
48454079 2134 struct l2cap_chan *chan;
1da177e4
LT		 2135
2136 BT_DBG("conn %p", conn);
2137
3df91ea2 2138 mutex_lock(&conn->chan_lock);
3d57dc68 2139
3df91ea2 2140 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2141 struct sock *sk = chan->sk;
715ec005 2142 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2143 continue;
2144
2145 /* Don't send frame to the socket it came from */
2146 if (skb->sk == sk)
2147 continue;
af05b30b
GP		 2148 nskb = skb_clone(skb, GFP_ATOMIC);
2149 if (!nskb)
1da177e4
LT		 2150 continue;
2151
23070494 2152 if (chan->ops->recv(chan->data, nskb))
1da177e4
LT		 2153 kfree_skb(nskb);
2154 }
3d57dc68 2155
3df91ea2 2156 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2157}
2158
2159/* ---- L2CAP signalling commands ---- */
2160static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2161 u8 code, u8 ident, u16 dlen, void *data)
2162{
2163 struct sk_buff *skb, **frag;
2164 struct l2cap_cmd_hdr *cmd;
2165 struct l2cap_hdr *lh;
2166 int len, count;
2167
af05b30b
GP		 2168 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2169 conn, code, ident, dlen);
1da177e4
LT		 2170
2171 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2172 count = min_t(unsigned int, conn->mtu, len);
2173
2174 skb = bt_skb_alloc(count, GFP_ATOMIC);
2175 if (!skb)
2176 return NULL;
2177
2178 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2179 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2180
2181 if (conn->hcon->type == LE_LINK)
2182 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
2183 else
2184 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2185
2186 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2187 cmd->code = code;
2188 cmd->ident = ident;
aca3192c 2189 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2190
2191 if (dlen) {
2192 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2193 memcpy(skb_put(skb, count), data, count);
2194 data += count;
2195 }
2196
2197 len -= skb->len;
2198
2199 /* Continuation fragments (no L2CAP header) */
2200 frag = &skb_shinfo(skb)->frag_list;
2201 while (len) {
2202 count = min_t(unsigned int, conn->mtu, len);
2203
2204 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2205 if (!*frag)
2206 goto fail;
2207
2208 memcpy(skb_put(*frag, count), data, count);
2209
2210 len -= count;
2211 data += count;
2212
2213 frag = &(*frag)->next;
2214 }
2215
2216 return skb;
2217
2218fail:
2219 kfree_skb(skb);
2220 return NULL;
2221}
2222
2223static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2224{
2225 struct l2cap_conf_opt *opt = *ptr;
2226 int len;
2227
2228 len = L2CAP_CONF_OPT_SIZE + opt->len;
2229 *ptr += len;
2230
2231 *type = opt->type;
2232 *olen = opt->len;
2233
2234 switch (opt->len) {
2235 case 1:
2236 *val = *((u8 *) opt->val);
2237 break;
2238
2239 case 2:
bfaaeb3e 2240 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2241 break;
2242
2243 case 4:
bfaaeb3e 2244 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2245 break;
2246
2247 default:
2248 *val = (unsigned long) opt->val;
2249 break;
2250 }
2251
2252 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2253 return len;
2254}
2255
1da177e4
LT		 2256static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2257{
2258 struct l2cap_conf_opt *opt = *ptr;
2259
2260 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2261
2262 opt->type = type;
2263 opt->len = len;
2264
2265 switch (len) {
2266 case 1:
2267 *((u8 *) opt->val) = val;
2268 break;
2269
2270 case 2:
4f8b691c 2271 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2272 break;
2273
2274 case 4:
4f8b691c 2275 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2276 break;
2277
2278 default:
2279 memcpy(opt->val, (void *) val, len);
2280 break;
2281 }
2282
2283 *ptr += L2CAP_CONF_OPT_SIZE + len;
2284}
2285
f89cef09
AE		 2286static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2287{
2288 struct l2cap_conf_efs efs;
2289
1ec918ce 2290 switch (chan->mode) {
f89cef09
AE		 2291 case L2CAP_MODE_ERTM:
2292 efs.id = chan->local_id;
2293 efs.stype = chan->local_stype;
2294 efs.msdu = cpu_to_le16(chan->local_msdu);
2295 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2296 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2297 efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO);
2298 break;
2299
2300 case L2CAP_MODE_STREAMING:
2301 efs.id = 1;
2302 efs.stype = L2CAP_SERV_BESTEFFORT;
2303 efs.msdu = cpu_to_le16(chan->local_msdu);
2304 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2305 efs.acc_lat = 0;
2306 efs.flush_to = 0;
2307 break;
2308
2309 default:
2310 return;
2311 }
2312
2313 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
2314 (unsigned long) &efs);
2315}
2316
721c4181 2317static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 2318{
721c4181
GP		 2319 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2320 ack_timer.work);
c1b4f43b 2321
2fb9b3d4
GP		 2322 BT_DBG("chan %p", chan);
2323
6be36555
AE		 2324 l2cap_chan_lock(chan);
2325
b17e73bb 2326 __l2cap_send_ack(chan);
6be36555
AE		 2327
2328 l2cap_chan_unlock(chan);
09bfb2ee
SJ		 2329
2330 l2cap_chan_put(chan);
c1b4f43b
GP		 2331}
2332
3c588192 2333static inline int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 2334{
3c588192
MM		 2335 int err;
2336
105bdf9e
MM		 2337 chan->next_tx_seq = 0;
2338 chan->expected_tx_seq = 0;
42e5c802 2339 chan->expected_ack_seq = 0;
6a026610 2340 chan->unacked_frames = 0;
42e5c802 2341 chan->buffer_seq = 0;
6a026610
GP		 2342 chan->num_acked = 0;
2343 chan->frames_sent = 0;
105bdf9e
MM		 2344 chan->last_acked_seq = 0;
2345 chan->sdu = NULL;
2346 chan->sdu_last_frag = NULL;
2347 chan->sdu_len = 0;
2348
2349 if (chan->mode != L2CAP_MODE_ERTM)
2350 return 0;
2351
2352 chan->rx_state = L2CAP_RX_STATE_RECV;
2353 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 2354
721c4181
GP		 2355 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2356 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2357 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 2358
f1c6775b 2359 skb_queue_head_init(&chan->srej_q);
105bdf9e 2360 skb_queue_head_init(&chan->tx_q);
1890d36b 2361
39d5a3ee 2362 INIT_LIST_HEAD(&chan->srej_l);
3c588192
MM		 2363 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
2364 if (err < 0)
2365 return err;
2366
2367 return l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
0565c1c2
GP		 2368}
2369
f2fcfcd6
GP		 2370static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2371{
2372 switch (mode) {
2373 case L2CAP_MODE_STREAMING:
2374 case L2CAP_MODE_ERTM:
2375 if (l2cap_mode_supported(mode, remote_feat_mask))
2376 return mode;
2377 /* fall through */
2378 default:
2379 return L2CAP_MODE_BASIC;
2380 }
2381}
2382
6327eb98
AE		 2383static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2384{
2385 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2386}
2387
f89cef09
AE		 2388static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2389{
2390 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2391}
2392
6327eb98
AE		 2393static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
2394{
2395 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
836be934 2396 __l2cap_ews_supported(chan)) {
6327eb98
AE		 2397 /* use extended control field */
2398 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 2399 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
2400 } else {
6327eb98
AE		 2401 chan->tx_win = min_t(u16, chan->tx_win,
2402 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 2403 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
2404 }
6327eb98
AE		 2405}
2406
710f9b0a 2407static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2408{
1da177e4 2409 struct l2cap_conf_req *req = data;
0c1bc5c6 2410 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 2411 void *ptr = req->data;
c8f79162 2412 u16 size;
1da177e4 2413
49208c9c 2414 BT_DBG("chan %p", chan);
1da177e4 2415
73ffa904 2416 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 2417 goto done;
2418
0c1bc5c6 2419 switch (chan->mode) {
f2fcfcd6
GP		 2420 case L2CAP_MODE_STREAMING:
2421 case L2CAP_MODE_ERTM:
c1360a1c 2422 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 2423 break;
85eb53c6 2424
f89cef09
AE		 2425 if (__l2cap_efs_supported(chan))
2426 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2427
2ba13ed6 2428 /* fall through */
f2fcfcd6 2429 default:
8c1d787b 2430 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 2431 break;
2432 }
2433
2434done:
0c1bc5c6
GP		 2435 if (chan->imtu != L2CAP_DEFAULT_MTU)
2436 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 2437
0c1bc5c6 2438 switch (chan->mode) {
65c7c491 2439 case L2CAP_MODE_BASIC:
8c1d787b
GP		 2440 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2441 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 2442 break;
2443
62547752
GP		 2444 rfc.mode = L2CAP_MODE_BASIC;
2445 rfc.txwin_size = 0;
2446 rfc.max_transmit = 0;
2447 rfc.retrans_timeout = 0;
2448 rfc.monitor_timeout = 0;
2449 rfc.max_pdu_size = 0;
2450
63406504
GP		 2451 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2452 (unsigned long) &rfc);
65c7c491
MH		 2453 break;
2454
2455 case L2CAP_MODE_ERTM:
2456 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 2457 rfc.max_transmit = chan->max_tx;
f2fcfcd6
GP		 2458 rfc.retrans_timeout = 0;
2459 rfc.monitor_timeout = 0;
c8f79162
AE		 2460
2461 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2462 L2CAP_EXT_HDR_SIZE -
2463 L2CAP_SDULEN_SIZE -
2464 L2CAP_FCS_SIZE);
2465 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 2466
6327eb98
AE		 2467 l2cap_txwin_setup(chan);
2468
2469 rfc.txwin_size = min_t(u16, chan->tx_win,
2470 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 2471
63406504
GP		 2472 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2473 (unsigned long) &rfc);
2474
f89cef09
AE		 2475 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2476 l2cap_add_opt_efs(&ptr, chan);
2477
8c1d787b 2478 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2479 break;
2480
47d1ec61 2481 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2482 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2483 chan->fcs = L2CAP_FCS_NONE;
2484 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2485 }
6327eb98
AE		 2486
2487 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2488 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2489 chan->tx_win);
f2fcfcd6
GP		 2490 break;
2491
2492 case L2CAP_MODE_STREAMING:
2493 rfc.mode = L2CAP_MODE_STREAMING;
2494 rfc.txwin_size = 0;
2495 rfc.max_transmit = 0;
2496 rfc.retrans_timeout = 0;
2497 rfc.monitor_timeout = 0;
c8f79162
AE		 2498
2499 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2500 L2CAP_EXT_HDR_SIZE -
2501 L2CAP_SDULEN_SIZE -
2502 L2CAP_FCS_SIZE);
2503 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 2504
63406504
GP		 2505 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2506 (unsigned long) &rfc);
2507
f89cef09
AE		 2508 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2509 l2cap_add_opt_efs(&ptr, chan);
2510
8c1d787b 2511 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2512 break;
2513
47d1ec61 2514 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2515 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2516 chan->fcs = L2CAP_FCS_NONE;
2517 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2518 }
65c7c491
MH		 2519 break;
2520 }
1da177e4 2521
fe4128e0 2522 req->dcid = cpu_to_le16(chan->dcid);
aca3192c 2523 req->flags = cpu_to_le16(0);
1da177e4
LT		 2524
2525 return ptr - data;
2526}
2527
73ffa904 2528static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2529{
5dee9e7c
MH		 2530 struct l2cap_conf_rsp *rsp = data;
2531 void *ptr = rsp->data;
73ffa904
GP		 2532 void *req = chan->conf_req;
2533 int len = chan->conf_len;
5dee9e7c
MH		 2534 int type, hint, olen;
2535 unsigned long val;
6464f35f 2536 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 2537 struct l2cap_conf_efs efs;
2538 u8 remote_efs = 0;
861d6882 2539 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2540 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 2541 u16 size;
1da177e4 2542
73ffa904 2543 BT_DBG("chan %p", chan);
820ae1b8 2544
5dee9e7c
MH		 2545 while (len >= L2CAP_CONF_OPT_SIZE) {
2546 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2547
589d2746 2548 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2549 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2550
2551 switch (type) {
2552 case L2CAP_CONF_MTU:
861d6882 2553 mtu = val;
5dee9e7c
MH		 2554 break;
2555
2556 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2557 chan->flush_to = val;
5dee9e7c
MH		 2558 break;
2559
2560 case L2CAP_CONF_QOS:
2561 break;
2562
6464f35f
MH		 2563 case L2CAP_CONF_RFC:
2564 if (olen == sizeof(rfc))
2565 memcpy(&rfc, (void *) val, olen);
2566 break;
2567
fcc203c3
GP		 2568 case L2CAP_CONF_FCS:
2569 if (val == L2CAP_FCS_NONE)
c1360a1c 2570 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 2571 break;
fcc203c3 2572
42dceae2
AE		 2573 case L2CAP_CONF_EFS:
2574 remote_efs = 1;
2575 if (olen == sizeof(efs))
2576 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 2577 break;
2578
6327eb98
AE		 2579 case L2CAP_CONF_EWS:
2580 if (!enable_hs)
2581 return -ECONNREFUSED;
fcc203c3 2582
6327eb98
AE		 2583 set_bit(FLAG_EXT_CTRL, &chan->flags);
2584 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 2585 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 2586 chan->remote_tx_win = val;
fcc203c3
GP		 2587 break;
2588
5dee9e7c
MH		 2589 default:
2590 if (hint)
2591 break;
2592
2593 result = L2CAP_CONF_UNKNOWN;
2594 *((u8 *) ptr++) = type;
2595 break;
2596 }
2597 }
2598
73ffa904 2599 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 2600 goto done;
2601
0c1bc5c6 2602 switch (chan->mode) {
f2fcfcd6
GP		 2603 case L2CAP_MODE_STREAMING:
2604 case L2CAP_MODE_ERTM:
c1360a1c 2605 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 2606 chan->mode = l2cap_select_mode(rfc.mode,
8c1d787b 2607 chan->conn->feat_mask);
85eb53c6
GP		 2608 break;
2609 }
2610
42dceae2
AE		 2611 if (remote_efs) {
2612 if (__l2cap_efs_supported(chan))
2613 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2614 else
2615 return -ECONNREFUSED;
2616 }
2617
0c1bc5c6 2618 if (chan->mode != rfc.mode)
f2fcfcd6 2619 return -ECONNREFUSED;
742e519b 2620
f2fcfcd6 2621 break;
f2fcfcd6
GP		 2622 }
2623
2624done:
0c1bc5c6 2625 if (chan->mode != rfc.mode) {
f2fcfcd6 2626 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2627 rfc.mode = chan->mode;
f2fcfcd6 2628
73ffa904 2629 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 2630 return -ECONNREFUSED;
2631
2632 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2633 sizeof(rfc), (unsigned long) &rfc);
2634 }
2635
5dee9e7c
MH		 2636 if (result == L2CAP_CONF_SUCCESS) {
2637 /* Configure output options and let the other side know
2638 * which ones we don't like. */
2639
f2fcfcd6
GP		 2640 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2641 result = L2CAP_CONF_UNACCEPT;
2642 else {
0c1bc5c6 2643 chan->omtu = mtu;
c1360a1c 2644 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 2645 }
0c1bc5c6 2646 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 2647
42dceae2
AE		 2648 if (remote_efs) {
2649 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2650 efs.stype != L2CAP_SERV_NOTRAFIC &&
2651 efs.stype != chan->local_stype) {
2652
2653 result = L2CAP_CONF_UNACCEPT;
2654
2655 if (chan->num_conf_req >= 1)
2656 return -ECONNREFUSED;
2657
2658 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3e6b3b95 2659 sizeof(efs),
42dceae2 2660 (unsigned long) &efs);
0e8b207e 2661 } else {
3e6b3b95 2662 /* Send PENDING Conf Rsp */
0e8b207e
AE		 2663 result = L2CAP_CONF_PENDING;
2664 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 2665 }
2666 }
2667
f2fcfcd6
GP		 2668 switch (rfc.mode) {
2669 case L2CAP_MODE_BASIC:
47d1ec61 2670 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 2671 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 2672 break;
2673
2674 case L2CAP_MODE_ERTM:
6327eb98
AE		 2675 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
2676 chan->remote_tx_win = rfc.txwin_size;
2677 else
2678 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 2679
2c03a7a4 2680 chan->remote_max_tx = rfc.max_transmit;
1c762159 2681
c8f79162
AE		 2682 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2683 chan->conn->mtu -
2684 L2CAP_EXT_HDR_SIZE -
2685 L2CAP_SDULEN_SIZE -
2686 L2CAP_FCS_SIZE);
2687 rfc.max_pdu_size = cpu_to_le16(size);
2688 chan->remote_mps = size;
f2fcfcd6 2689
10467e9e 2690 rfc.retrans_timeout =
4fd21a88 2691 __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
10467e9e 2692 rfc.monitor_timeout =
4fd21a88 2693 __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6 2694
c1360a1c 2695 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 2696
2697 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2698 sizeof(rfc), (unsigned long) &rfc);
2699
42dceae2
AE		 2700 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2701 chan->remote_id = efs.id;
2702 chan->remote_stype = efs.stype;
2703 chan->remote_msdu = le16_to_cpu(efs.msdu);
2704 chan->remote_flush_to =
2705 le32_to_cpu(efs.flush_to);
2706 chan->remote_acc_lat =
2707 le32_to_cpu(efs.acc_lat);
2708 chan->remote_sdu_itime =
2709 le32_to_cpu(efs.sdu_itime);
2710 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2711 sizeof(efs), (unsigned long) &efs);
2712 }
f2fcfcd6
GP		 2713 break;
2714
2715 case L2CAP_MODE_STREAMING:
c8f79162
AE		 2716 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2717 chan->conn->mtu -
2718 L2CAP_EXT_HDR_SIZE -
2719 L2CAP_SDULEN_SIZE -
2720 L2CAP_FCS_SIZE);
2721 rfc.max_pdu_size = cpu_to_le16(size);
2722 chan->remote_mps = size;
f2fcfcd6 2723
c1360a1c 2724 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 2725
2726 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2727 sizeof(rfc), (unsigned long) &rfc);
2728
f2fcfcd6
GP		 2729 break;
2730
2731 default:
5dee9e7c 2732 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2733
6464f35f 2734 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 2735 rfc.mode = chan->mode;
f2fcfcd6 2736 }
6464f35f 2737
f2fcfcd6 2738 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 2739 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 2740 }
fe4128e0 2741 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c
MH		 2742 rsp->result = cpu_to_le16(result);
2743 rsp->flags = cpu_to_le16(0x0000);
2744
2745 return ptr - data;
1da177e4
LT		 2746}
2747
b4450035 2748static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
f2fcfcd6 2749{
f2fcfcd6
GP		 2750 struct l2cap_conf_req *req = data;
2751 void *ptr = req->data;
2752 int type, olen;
2753 unsigned long val;
36e999a8 2754 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 2755 struct l2cap_conf_efs efs;
f2fcfcd6 2756
fe4128e0 2757 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 2758
2759 while (len >= L2CAP_CONF_OPT_SIZE) {
2760 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2761
2762 switch (type) {
2763 case L2CAP_CONF_MTU:
2764 if (val < L2CAP_DEFAULT_MIN_MTU) {
2765 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2766 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 2767 } else
0c1bc5c6
GP		 2768 chan->imtu = val;
2769 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 2770 break;
2771
2772 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2773 chan->flush_to = val;
f2fcfcd6 2774 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
0c1bc5c6 2775 2, chan->flush_to);
f2fcfcd6
GP		 2776 break;
2777
2778 case L2CAP_CONF_RFC:
2779 if (olen == sizeof(rfc))
2780 memcpy(&rfc, (void *)val, olen);
2781
c1360a1c 2782 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
0c1bc5c6 2783 rfc.mode != chan->mode)
f2fcfcd6
GP		 2784 return -ECONNREFUSED;
2785
47d1ec61 2786 chan->fcs = 0;
f2fcfcd6
GP		 2787
2788 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2789 sizeof(rfc), (unsigned long) &rfc);
2790 break;
6327eb98
AE		 2791
2792 case L2CAP_CONF_EWS:
2793 chan->tx_win = min_t(u16, val,
2794 L2CAP_DEFAULT_EXT_WINDOW);
3e6b3b95
GP		 2795 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2796 chan->tx_win);
6327eb98 2797 break;
66af7aaf
AE		 2798
2799 case L2CAP_CONF_EFS:
2800 if (olen == sizeof(efs))
2801 memcpy(&efs, (void *)val, olen);
2802
2803 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2804 efs.stype != L2CAP_SERV_NOTRAFIC &&
2805 efs.stype != chan->local_stype)
2806 return -ECONNREFUSED;
2807
2808 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2809 sizeof(efs), (unsigned long) &efs);
2810 break;
f2fcfcd6
GP		 2811 }
2812 }
2813
0c1bc5c6 2814 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 2815 return -ECONNREFUSED;
2816
0c1bc5c6 2817 chan->mode = rfc.mode;
6c2ea7a8 2818
0e8b207e 2819 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 2820 switch (rfc.mode) {
2821 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2822 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2823 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2824 chan->mps = le16_to_cpu(rfc.max_pdu_size);
66af7aaf
AE		 2825
2826 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2827 chan->local_msdu = le16_to_cpu(efs.msdu);
2828 chan->local_sdu_itime =
2829 le32_to_cpu(efs.sdu_itime);
2830 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
2831 chan->local_flush_to =
2832 le32_to_cpu(efs.flush_to);
2833 }
f2fcfcd6 2834 break;
66af7aaf 2835
f2fcfcd6 2836 case L2CAP_MODE_STREAMING:
47d1ec61 2837 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2838 }
2839 }
2840
fe4128e0 2841 req->dcid = cpu_to_le16(chan->dcid);
f2fcfcd6
GP		 2842 req->flags = cpu_to_le16(0x0000);
2843
2844 return ptr - data;
2845}
2846
fe4128e0 2847static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1da177e4
LT		 2848{
2849 struct l2cap_conf_rsp *rsp = data;
2850 void *ptr = rsp->data;
1da177e4 2851
fe4128e0 2852 BT_DBG("chan %p", chan);
1da177e4 2853
fe4128e0 2854 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 2855 rsp->result = cpu_to_le16(result);
aca3192c 2856 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2857
2858 return ptr - data;
2859}
2860
8c1d787b 2861void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 2862{
2863 struct l2cap_conn_rsp rsp;
8c1d787b 2864 struct l2cap_conn *conn = chan->conn;
710f9b0a
GP		 2865 u8 buf[128];
2866
fe4128e0
GP		 2867 rsp.scid = cpu_to_le16(chan->dcid);
2868 rsp.dcid = cpu_to_le16(chan->scid);
710f9b0a
GP		 2869 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
2870 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
2871 l2cap_send_cmd(conn, chan->ident,
2872 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2873
c1360a1c 2874 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 2875 return;
2876
710f9b0a
GP		 2877 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2878 l2cap_build_conf_req(chan, buf), buf);
2879 chan->num_conf_req++;
2880}
2881
47d1ec61 2882static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 2883{
7b1c0049
GP		 2884 int type, olen;
2885 unsigned long val;
2886 struct l2cap_conf_rfc rfc;
2887
47d1ec61 2888 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 2889
0c1bc5c6 2890 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 2891 return;
2892
2893 while (len >= L2CAP_CONF_OPT_SIZE) {
2894 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2895
2896 switch (type) {
2897 case L2CAP_CONF_RFC:
2898 if (olen == sizeof(rfc))
2899 memcpy(&rfc, (void *)val, olen);
2900 goto done;
2901 }
2902 }
2903
36e999a8
MM		 2904 /* Use sane default values in case a misbehaving remote device
2905 * did not send an RFC option.
2906 */
2907 rfc.mode = chan->mode;
2908 rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
2909 rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
2910 rfc.max_pdu_size = cpu_to_le16(chan->imtu);
2911
2912 BT_ERR("Expected RFC option was not found, using defaults");
2913
7b1c0049
GP		 2914done:
2915 switch (rfc.mode) {
2916 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2917 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2918 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2919 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2920 break;
2921 case L2CAP_MODE_STREAMING:
47d1ec61 2922 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2923 }
2924}
2925
4e8402a3
MH		 2926static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2927{
e2fd318e 2928 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 2929
e2fd318e 2930 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 2931 return 0;
2932
2933 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2934 cmd->ident == conn->info_ident) {
17cd3f37 2935 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 2936
2937 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2938 conn->info_ident = 0;
984947dc 2939
4e8402a3
MH		 2940 l2cap_conn_start(conn);
2941 }
2942
2943 return 0;
2944}
2945
1da177e4
LT		 2946static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2947{
1da177e4
LT		 2948 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2949 struct l2cap_conn_rsp rsp;
23691d75 2950 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 2951 struct sock *parent, *sk = NULL;
e7c29cb1 2952 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2953
2954 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2955 __le16 psm = req->psm;
1da177e4 2956
097db76c 2957 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 2958
2959 /* Check if we have socket listening on psm */
c2287681 2960 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 2961 if (!pchan) {
1da177e4
LT		 2962 result = L2CAP_CR_BAD_PSM;
2963 goto sendresp;
2964 }
2965
23691d75
GP		 2966 parent = pchan->sk;
2967
3df91ea2 2968 mutex_lock(&conn->chan_lock);
aa2ac881 2969 lock_sock(parent);
e0f0cb56 2970
e7c29cb1
MH		 2971 /* Check if the ACL is secure enough (if not SDP) */
2972 if (psm != cpu_to_le16(0x0001) &&
2973 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 2974 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 2975 result = L2CAP_CR_SEC_BLOCK;
2976 goto response;
2977 }
2978
1da177e4
LT		 2979 result = L2CAP_CR_NO_MEM;
2980
2981 /* Check for backlog size */
2982 if (sk_acceptq_is_full(parent)) {
8e87d142 2983 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2984 goto response;
2985 }
2986
80808e43
GP		 2987 chan = pchan->ops->new_connection(pchan->data);
2988 if (!chan)
1da177e4
LT		 2989 goto response;
2990
80808e43
GP		 2991 sk = chan->sk;
2992
1da177e4 2993 /* Check if we already have channel with that dcid */
baa7e1fa 2994 if (__l2cap_get_chan_by_dcid(conn, scid)) {
1da177e4 2995 sock_set_flag(sk, SOCK_ZAPPED);
ba3bd0ee 2996 chan->ops->close(chan->data);
1da177e4
LT		 2997 goto response;
2998 }
2999
3000 hci_conn_hold(conn->hcon);
3001
1da177e4
LT		 3002 bacpy(&bt_sk(sk)->src, conn->src);
3003 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3004 chan->psm = psm;
3005 chan->dcid = scid;
1da177e4 3006
d1010240
GP		 3007 bt_accept_enqueue(parent, sk);
3008
6be36555 3009 __l2cap_chan_add(conn, chan);
48454079 3010
fe4128e0 3011 dcid = chan->scid;
1da177e4 3012
c9b66675 3013 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3014
fc7f8a7e 3015 chan->ident = cmd->ident;
1da177e4 3016
984947dc 3017 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3018 if (l2cap_chan_check_security(chan)) {
f66dc81f 3019 if (bt_sk(sk)->defer_setup) {
0e587be7 3020 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3021 result = L2CAP_CR_PEND;
3022 status = L2CAP_CS_AUTHOR_PEND;
3023 parent->sk_data_ready(parent, 0);
3024 } else {
0e587be7 3025 __l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 3026 result = L2CAP_CR_SUCCESS;
3027 status = L2CAP_CS_NO_INFO;
3028 }
79d554a6 3029 } else {
0e587be7 3030 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3031 result = L2CAP_CR_PEND;
3032 status = L2CAP_CS_AUTHEN_PEND;
3033 }
3034 } else {
0e587be7 3035 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3036 result = L2CAP_CR_PEND;
3037 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3038 }
3039
1da177e4 3040response:
aa2ac881 3041 release_sock(parent);
3df91ea2 3042 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3043
3044sendresp:
aca3192c
YH		 3045 rsp.scid = cpu_to_le16(scid);
3046 rsp.dcid = cpu_to_le16(dcid);
3047 rsp.result = cpu_to_le16(result);
3048 rsp.status = cpu_to_le16(status);
1da177e4 3049 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 3050
3051 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3052 struct l2cap_info_req info;
3053 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3054
3055 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3056 conn->info_ident = l2cap_get_ident(conn);
3057
ba13ccd9 3058 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6
MH		 3059
3060 l2cap_send_cmd(conn, conn->info_ident,
3061 L2CAP_INFO_REQ, sizeof(info), &info);
3062 }
3063
c1360a1c 3064 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
e9aeb2dd
GP		 3065 result == L2CAP_CR_SUCCESS) {
3066 u8 buf[128];
c1360a1c 3067 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3068 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3069 l2cap_build_conf_req(chan, buf), buf);
3070 chan->num_conf_req++;
e9aeb2dd
GP		 3071 }
3072
1da177e4
LT		 3073 return 0;
3074}
3075
3076static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3077{
3078 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3079 u16 scid, dcid, result, status;
48454079 3080 struct l2cap_chan *chan;
1da177e4 3081 u8 req[128];
3df91ea2 3082 int err;
1da177e4
LT		 3083
3084 scid = __le16_to_cpu(rsp->scid);
3085 dcid = __le16_to_cpu(rsp->dcid);
3086 result = __le16_to_cpu(rsp->result);
3087 status = __le16_to_cpu(rsp->status);
3088
1b009c98
AE		 3089 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3090 dcid, scid, result, status);
1da177e4 3091
3df91ea2
AE		 3092 mutex_lock(&conn->chan_lock);
3093
1da177e4 3094 if (scid) {
3df91ea2
AE		 3095 chan = __l2cap_get_chan_by_scid(conn, scid);
3096 if (!chan) {
3097 err = -EFAULT;
3098 goto unlock;
3099 }
1da177e4 3100 } else {
3df91ea2
AE		 3101 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3102 if (!chan) {
3103 err = -EFAULT;
3104 goto unlock;
3105 }
1da177e4
LT		 3106 }
3107
3df91ea2
AE		 3108 err = 0;
3109
6be36555 3110 l2cap_chan_lock(chan);
48454079 3111
1da177e4
LT		 3112 switch (result) {
3113 case L2CAP_CR_SUCCESS:
89bc500e 3114 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3115 chan->ident = 0;
fe4128e0 3116 chan->dcid = dcid;
c1360a1c 3117 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3118
c1360a1c 3119 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3120 break;
3121
1da177e4 3122 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3123 l2cap_build_conf_req(chan, req), req);
3124 chan->num_conf_req++;
1da177e4
LT		 3125 break;
3126
3127 case L2CAP_CR_PEND:
c1360a1c 3128 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3129 break;
3130
3131 default:
48454079 3132 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3133 break;
3134 }
3135
6be36555 3136 l2cap_chan_unlock(chan);
3df91ea2
AE		 3137
3138unlock:
3139 mutex_unlock(&conn->chan_lock);
3140
3141 return err;
1da177e4
LT		 3142}
3143
47d1ec61 3144static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3145{
3146 /* FCS is enabled only in ERTM or streaming mode, if one or both
3147 * sides request it.
3148 */
0c1bc5c6 3149 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3150 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3151 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 3152 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3153}
3154
88219a0f 3155static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3156{
3157 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3158 u16 dcid, flags;
3159 u8 rsp[64];
48454079 3160 struct l2cap_chan *chan;
3c588192 3161 int len, err = 0;
1da177e4
LT		 3162
3163 dcid = __le16_to_cpu(req->dcid);
3164 flags = __le16_to_cpu(req->flags);
3165
3166 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3167
baa7e1fa 3168 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3169 if (!chan)
1da177e4
LT		 3170 return -ENOENT;
3171
6be36555 3172 l2cap_chan_lock(chan);
48454079 3173
033b1142 3174 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3175 struct l2cap_cmd_rej_cid rej;
3176
3177 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
3178 rej.scid = cpu_to_le16(chan->scid);
3179 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3180
df6bd743
GP		 3181 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
3182 sizeof(rej), &rej);
354f60a9 3183 goto unlock;
df6bd743 3184 }
354f60a9 3185
5dee9e7c 3186 /* Reject if config buffer is too small. */
88219a0f 3187 len = cmd_len - sizeof(*req);
7ac28817 3188 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3189 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 3190 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c
MH		 3191 L2CAP_CONF_REJECT, flags), rsp);
3192 goto unlock;
3193 }
3194
3195 /* Store config. */
73ffa904
GP		 3196 memcpy(chan->conf_req + chan->conf_len, req->data, len);
3197 chan->conf_len += len;
1da177e4
LT		 3198
3199 if (flags & 0x0001) {
3200 /* Incomplete config. Send empty response. */
3201 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 3202 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c 3203 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 3204 goto unlock;
3205 }
3206
3207 /* Complete config. */
73ffa904 3208 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 3209 if (len < 0) {
e92c8e70 3210 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 3211 goto unlock;
f2fcfcd6 3212 }
1da177e4 3213
5dee9e7c 3214 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 3215 chan->num_conf_rsp++;
5dee9e7c 3216
5dee9e7c 3217 /* Reset config buffer. */
73ffa904 3218 chan->conf_len = 0;
5dee9e7c 3219
c1360a1c 3220 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 3221 goto unlock;
3222
c1360a1c 3223 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 3224 set_default_fcs(chan);
fcc203c3 3225
89bc500e 3226 l2cap_state_change(chan, BT_CONNECTED);
e90bac06 3227
105bdf9e
MM		 3228 if (chan->mode == L2CAP_MODE_ERTM ||
3229 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 3230 err = l2cap_ertm_init(chan);
3231
3232 if (err < 0)
3233 l2cap_send_disconn_req(chan->conn, chan, -err);
3234 else
3235 l2cap_chan_ready(chan);
0565c1c2 3236
876d9484
MH		 3237 goto unlock;
3238 }
3239
c1360a1c 3240 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 3241 u8 buf[64];
1da177e4 3242 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3243 l2cap_build_conf_req(chan, buf), buf);
3244 chan->num_conf_req++;
1da177e4
LT		 3245 }
3246
0e8b207e
AE		 3247 /* Got Conf Rsp PENDING from remote side and asume we sent
3248 Conf Rsp PENDING in the code above */
3249 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
3250 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3251
3252 /* check compatibility */
3253
3254 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3255 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3256
3257 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 3258 l2cap_build_conf_rsp(chan, rsp,
0e8b207e
AE		 3259 L2CAP_CONF_SUCCESS, 0x0000), rsp);
3260 }
3261
1da177e4 3262unlock:
6be36555 3263 l2cap_chan_unlock(chan);
3c588192 3264 return err;
1da177e4
LT		 3265}
3266
3267static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3268{
3269 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3270 u16 scid, flags, result;
48454079 3271 struct l2cap_chan *chan;
61386cba 3272 int len = le16_to_cpu(cmd->len) - sizeof(*rsp);
3c588192 3273 int err = 0;
1da177e4
LT		 3274
3275 scid = __le16_to_cpu(rsp->scid);
3276 flags = __le16_to_cpu(rsp->flags);
3277 result = __le16_to_cpu(rsp->result);
3278
61386cba
AE		 3279 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
3280 result, len);
1da177e4 3281
baa7e1fa 3282 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3283 if (!chan)
1da177e4
LT		 3284 return 0;
3285
6be36555 3286 l2cap_chan_lock(chan);
48454079 3287
1da177e4
LT		 3288 switch (result) {
3289 case L2CAP_CONF_SUCCESS:
47d1ec61 3290 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 3291 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 3292 break;
3293
0e8b207e
AE		 3294 case L2CAP_CONF_PENDING:
3295 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
3296
3297 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3298 char buf[64];
3299
3300 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
3301 buf, &result);
3302 if (len < 0) {
3303 l2cap_send_disconn_req(conn, chan, ECONNRESET);
3304 goto done;
3305 }
3306
3307 /* check compatibility */
3308
3309 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3310 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3311
3312 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 3313 l2cap_build_conf_rsp(chan, buf,
0e8b207e
AE		 3314 L2CAP_CONF_SUCCESS, 0x0000), buf);
3315 }
3316 goto done;
3317
1da177e4 3318 case L2CAP_CONF_UNACCEPT:
73ffa904 3319 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3320 char req[64];
3321
c2c77ec8 3322 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 3323 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 3324 goto done;
3325 }
3326
f2fcfcd6
GP		 3327 /* throw out any old stored conf requests */
3328 result = L2CAP_CONF_SUCCESS;
b4450035
GP		 3329 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
3330 req, &result);
f2fcfcd6 3331 if (len < 0) {
e92c8e70 3332 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 3333 goto done;
3334 }
3335
3336 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3337 L2CAP_CONF_REQ, len, req);
73ffa904 3338 chan->num_conf_req++;
f2fcfcd6
GP		 3339 if (result != L2CAP_CONF_SUCCESS)
3340 goto done;
3341 break;
1da177e4
LT		 3342 }
3343
8e87d142 3344 default:
6be36555 3345 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 3346
ba13ccd9 3347 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
e92c8e70 3348 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 3349 goto done;
3350 }
3351
3352 if (flags & 0x01)
3353 goto done;
3354
c1360a1c 3355 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 3356
c1360a1c 3357 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 3358 set_default_fcs(chan);
fcc203c3 3359
89bc500e 3360 l2cap_state_change(chan, BT_CONNECTED);
105bdf9e
MM		 3361 if (chan->mode == L2CAP_MODE_ERTM ||
3362 chan->mode == L2CAP_MODE_STREAMING)
3c588192 3363 err = l2cap_ertm_init(chan);
0565c1c2 3364
3c588192
MM		 3365 if (err < 0)
3366 l2cap_send_disconn_req(chan->conn, chan, -err);
3367 else
3368 l2cap_chan_ready(chan);
1da177e4
LT		 3369 }
3370
3371done:
6be36555 3372 l2cap_chan_unlock(chan);
3c588192 3373 return err;
1da177e4
LT		 3374}
3375
3376static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3377{
3378 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3379 struct l2cap_disconn_rsp rsp;
3380 u16 dcid, scid;
48454079 3381 struct l2cap_chan *chan;
1da177e4
LT		 3382 struct sock *sk;
3383
3384 scid = __le16_to_cpu(req->scid);
3385 dcid = __le16_to_cpu(req->dcid);
3386
3387 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3388
3df91ea2
AE		 3389 mutex_lock(&conn->chan_lock);
3390
3391 chan = __l2cap_get_chan_by_scid(conn, dcid);
3392 if (!chan) {
3393 mutex_unlock(&conn->chan_lock);
1da177e4 3394 return 0;
3df91ea2 3395 }
1da177e4 3396
6be36555
AE		 3397 l2cap_chan_lock(chan);
3398
48454079
GP		 3399 sk = chan->sk;
3400
fe4128e0
GP		 3401 rsp.dcid = cpu_to_le16(chan->scid);
3402 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 3403 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3404
6be36555 3405 lock_sock(sk);
1da177e4 3406 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 3407 release_sock(sk);
1da177e4 3408
61d6ef3e 3409 l2cap_chan_hold(chan);
48454079 3410 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 3411
3412 l2cap_chan_unlock(chan);
1da177e4 3413
ba3bd0ee 3414 chan->ops->close(chan->data);
61d6ef3e 3415 l2cap_chan_put(chan);
3df91ea2
AE		 3416
3417 mutex_unlock(&conn->chan_lock);
3418
1da177e4
LT		 3419 return 0;
3420}
3421
3422static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3423{
3424 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3425 u16 dcid, scid;
48454079 3426 struct l2cap_chan *chan;
1da177e4
LT		 3427
3428 scid = __le16_to_cpu(rsp->scid);
3429 dcid = __le16_to_cpu(rsp->dcid);
3430
3431 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3432
3df91ea2
AE		 3433 mutex_lock(&conn->chan_lock);
3434
3435 chan = __l2cap_get_chan_by_scid(conn, scid);
3436 if (!chan) {
3437 mutex_unlock(&conn->chan_lock);
1da177e4 3438 return 0;
3df91ea2 3439 }
1da177e4 3440
6be36555 3441 l2cap_chan_lock(chan);
48454079 3442
61d6ef3e 3443 l2cap_chan_hold(chan);
48454079 3444 l2cap_chan_del(chan, 0);
6be36555
AE		 3445
3446 l2cap_chan_unlock(chan);
1da177e4 3447
ba3bd0ee 3448 chan->ops->close(chan->data);
61d6ef3e 3449 l2cap_chan_put(chan);
3df91ea2
AE		 3450
3451 mutex_unlock(&conn->chan_lock);
3452
1da177e4
LT		 3453 return 0;
3454}
3455
3456static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3457{
3458 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3459 u16 type;
3460
3461 type = __le16_to_cpu(req->type);
3462
3463 BT_DBG("type 0x%4.4x", type);
3464
f0709e03
MH		 3465 if (type == L2CAP_IT_FEAT_MASK) {
3466 u8 buf[8];
44dd46de 3467 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3468 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3469 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3470 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3471 if (!disable_ertm)
fcc203c3
GP		 3472 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3473 | L2CAP_FEAT_FCS;
a5fd6f30 3474 if (enable_hs)
6327eb98
AE		 3475 feat_mask |= L2CAP_FEAT_EXT_FLOW
3476 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 3477
1b7bf4ed 3478 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3479 l2cap_send_cmd(conn, cmd->ident,
3480 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3481 } else if (type == L2CAP_IT_FIXED_CHAN) {
3482 u8 buf[12];
3483 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 3484
3485 if (enable_hs)
3486 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
3487 else
3488 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
3489
e1027a7c
MH		 3490 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3491 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 3492 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
e1027a7c
MH		 3493 l2cap_send_cmd(conn, cmd->ident,
3494 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3495 } else {
3496 struct l2cap_info_rsp rsp;
3497 rsp.type = cpu_to_le16(type);
3498 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3499 l2cap_send_cmd(conn, cmd->ident,
3500 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3501 }
1da177e4
LT		 3502
3503 return 0;
3504}
3505
3506static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3507{
3508 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3509 u16 type, result;
3510
3511 type = __le16_to_cpu(rsp->type);
3512 result = __le16_to_cpu(rsp->result);
3513
3514 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3515
e90165be
AE		 3516 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
3517 if (cmd->ident != conn->info_ident ||
3518 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
3519 return 0;
3520
17cd3f37 3521 cancel_delayed_work(&conn->info_timer);
4e8402a3 3522
adb08ede
VT		 3523 if (result != L2CAP_IR_SUCCESS) {
3524 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3525 conn->info_ident = 0;
3526
3527 l2cap_conn_start(conn);
3528
3529 return 0;
3530 }
3531
978c93b9
AE		 3532 switch (type) {
3533 case L2CAP_IT_FEAT_MASK:
83985319 3534 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3535
47ec1dcd 3536 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3537 struct l2cap_info_req req;
3538 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3539
3540 conn->info_ident = l2cap_get_ident(conn);
3541
3542 l2cap_send_cmd(conn, conn->info_ident,
3543 L2CAP_INFO_REQ, sizeof(req), &req);
3544 } else {
3545 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3546 conn->info_ident = 0;
3547
3548 l2cap_conn_start(conn);
3549 }
978c93b9
AE		 3550 break;
3551
3552 case L2CAP_IT_FIXED_CHAN:
3553 conn->fixed_chan_mask = rsp->data[0];
984947dc 3554 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3555 conn->info_ident = 0;
984947dc
MH		 3556
3557 l2cap_conn_start(conn);
978c93b9 3558 break;
984947dc 3559 }
4e8402a3 3560
1da177e4
LT		 3561 return 0;
3562}
3563
f94ff6ff
MM		 3564static inline int l2cap_create_channel_req(struct l2cap_conn *conn,
3565 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3566 void *data)
3567{
3568 struct l2cap_create_chan_req *req = data;
3569 struct l2cap_create_chan_rsp rsp;
3570 u16 psm, scid;
3571
3572 if (cmd_len != sizeof(*req))
3573 return -EPROTO;
3574
3575 if (!enable_hs)
3576 return -EINVAL;
3577
3578 psm = le16_to_cpu(req->psm);
3579 scid = le16_to_cpu(req->scid);
3580
3581 BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id);
3582
3583 /* Placeholder: Always reject */
3584 rsp.dcid = 0;
3585 rsp.scid = cpu_to_le16(scid);
8ce0c498
AE		 3586 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
3587 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f94ff6ff
MM		 3588
3589 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
3590 sizeof(rsp), &rsp);
3591
3592 return 0;
3593}
3594
3595static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn,
3596 struct l2cap_cmd_hdr *cmd, void *data)
3597{
3598 BT_DBG("conn %p", conn);
3599
3600 return l2cap_connect_rsp(conn, cmd, data);
3601}
3602
8d5a04a1
MM		 3603static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
3604 u16 icid, u16 result)
3605{
3606 struct l2cap_move_chan_rsp rsp;
3607
3608 BT_DBG("icid %d, result %d", icid, result);
3609
3610 rsp.icid = cpu_to_le16(icid);
3611 rsp.result = cpu_to_le16(result);
3612
3613 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
3614}
3615
3616static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn,
3617 struct l2cap_chan *chan, u16 icid, u16 result)
3618{
3619 struct l2cap_move_chan_cfm cfm;
3620 u8 ident;
3621
3622 BT_DBG("icid %d, result %d", icid, result);
3623
3624 ident = l2cap_get_ident(conn);
3625 if (chan)
3626 chan->ident = ident;
3627
3628 cfm.icid = cpu_to_le16(icid);
3629 cfm.result = cpu_to_le16(result);
3630
3631 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm);
3632}
3633
3634static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
3635 u16 icid)
3636{
3637 struct l2cap_move_chan_cfm_rsp rsp;
3638
3639 BT_DBG("icid %d", icid);
3640
3641 rsp.icid = cpu_to_le16(icid);
3642 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
3643}
3644
3645static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
3646 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3647{
3648 struct l2cap_move_chan_req *req = data;
3649 u16 icid = 0;
3650 u16 result = L2CAP_MR_NOT_ALLOWED;
3651
3652 if (cmd_len != sizeof(*req))
3653 return -EPROTO;
3654
3655 icid = le16_to_cpu(req->icid);
3656
3657 BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id);
3658
3659 if (!enable_hs)
3660 return -EINVAL;
3661
3662 /* Placeholder: Always refuse */
3663 l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
3664
3665 return 0;
3666}
3667
3668static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
3669 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3670{
3671 struct l2cap_move_chan_rsp *rsp = data;
3672 u16 icid, result;
3673
3674 if (cmd_len != sizeof(*rsp))
3675 return -EPROTO;
3676
3677 icid = le16_to_cpu(rsp->icid);
3678 result = le16_to_cpu(rsp->result);
3679
3680 BT_DBG("icid %d, result %d", icid, result);
3681
3682 /* Placeholder: Always unconfirmed */
3683 l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED);
3684
3685 return 0;
3686}
3687
3688static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
3689 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3690{
3691 struct l2cap_move_chan_cfm *cfm = data;
3692 u16 icid, result;
3693
3694 if (cmd_len != sizeof(*cfm))
3695 return -EPROTO;
3696
3697 icid = le16_to_cpu(cfm->icid);
3698 result = le16_to_cpu(cfm->result);
3699
3700 BT_DBG("icid %d, result %d", icid, result);
3701
3702 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
3703
3704 return 0;
3705}
3706
3707static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
3708 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3709{
3710 struct l2cap_move_chan_cfm_rsp *rsp = data;
3711 u16 icid;
3712
3713 if (cmd_len != sizeof(*rsp))
3714 return -EPROTO;
3715
3716 icid = le16_to_cpu(rsp->icid);
3717
3718 BT_DBG("icid %d", icid);
3719
3720 return 0;
3721}
3722
e2174ca4 3723static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
de73115a
CT		 3724 u16 to_multiplier)
3725{
3726 u16 max_latency;
3727
3728 if (min > max || min < 6 || max > 3200)
3729 return -EINVAL;
3730
3731 if (to_multiplier < 10 || to_multiplier > 3200)
3732 return -EINVAL;
3733
3734 if (max >= to_multiplier * 8)
3735 return -EINVAL;
3736
3737 max_latency = (to_multiplier * 8 / max) - 1;
3738 if (latency > 499 || latency > max_latency)
3739 return -EINVAL;
3740
3741 return 0;
3742}
3743
3744static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
3745 struct l2cap_cmd_hdr *cmd, u8 *data)
3746{
3747 struct hci_conn *hcon = conn->hcon;
3748 struct l2cap_conn_param_update_req *req;
3749 struct l2cap_conn_param_update_rsp rsp;
3750 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 3751 int err;
de73115a
CT		 3752
3753 if (!(hcon->link_mode & HCI_LM_MASTER))
3754 return -EINVAL;
3755
3756 cmd_len = __le16_to_cpu(cmd->len);
3757 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
3758 return -EPROTO;
3759
3760 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 3761 min = __le16_to_cpu(req->min);
3762 max = __le16_to_cpu(req->max);
de73115a
CT		 3763 latency = __le16_to_cpu(req->latency);
3764 to_multiplier = __le16_to_cpu(req->to_multiplier);
3765
3766 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
3767 min, max, latency, to_multiplier);
3768
3769 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 3770
3771 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
3772 if (err)
de73115a
CT		 3773 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
3774 else
3775 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
3776
3777 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
3778 sizeof(rsp), &rsp);
3779
2ce603eb
CT		 3780 if (!err)
3781 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
3782
de73115a
CT		 3783 return 0;
3784}
3785
3300d9a9
CT		 3786static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
3787 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3788{
3789 int err = 0;
3790
3791 switch (cmd->code) {
3792 case L2CAP_COMMAND_REJ:
3793 l2cap_command_rej(conn, cmd, data);
3794 break;
3795
3796 case L2CAP_CONN_REQ:
3797 err = l2cap_connect_req(conn, cmd, data);
3798 break;
3799
3800 case L2CAP_CONN_RSP:
3801 err = l2cap_connect_rsp(conn, cmd, data);
3802 break;
3803
3804 case L2CAP_CONF_REQ:
3805 err = l2cap_config_req(conn, cmd, cmd_len, data);
3806 break;
3807
3808 case L2CAP_CONF_RSP:
3809 err = l2cap_config_rsp(conn, cmd, data);
3810 break;
3811
3812 case L2CAP_DISCONN_REQ:
3813 err = l2cap_disconnect_req(conn, cmd, data);
3814 break;
3815
3816 case L2CAP_DISCONN_RSP:
3817 err = l2cap_disconnect_rsp(conn, cmd, data);
3818 break;
3819
3820 case L2CAP_ECHO_REQ:
3821 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
3822 break;
3823
3824 case L2CAP_ECHO_RSP:
3825 break;
3826
3827 case L2CAP_INFO_REQ:
3828 err = l2cap_information_req(conn, cmd, data);
3829 break;
3830
3831 case L2CAP_INFO_RSP:
3832 err = l2cap_information_rsp(conn, cmd, data);
3833 break;
3834
f94ff6ff
MM		 3835 case L2CAP_CREATE_CHAN_REQ:
3836 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
3837 break;
3838
3839 case L2CAP_CREATE_CHAN_RSP:
3840 err = l2cap_create_channel_rsp(conn, cmd, data);
3841 break;
3842
8d5a04a1
MM		 3843 case L2CAP_MOVE_CHAN_REQ:
3844 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
3845 break;
3846
3847 case L2CAP_MOVE_CHAN_RSP:
3848 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
3849 break;
3850
3851 case L2CAP_MOVE_CHAN_CFM:
3852 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
3853 break;
3854
3855 case L2CAP_MOVE_CHAN_CFM_RSP:
3856 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
3857 break;
3858
3300d9a9
CT		 3859 default:
3860 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
3861 err = -EINVAL;
3862 break;
3863 }
3864
3865 return err;
3866}
3867
3868static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
3869 struct l2cap_cmd_hdr *cmd, u8 *data)
3870{
3871 switch (cmd->code) {
3872 case L2CAP_COMMAND_REJ:
3873 return 0;
3874
3875 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 3876 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 3877
3878 case L2CAP_CONN_PARAM_UPDATE_RSP:
3879 return 0;
3880
3881 default:
3882 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
3883 return -EINVAL;
3884 }
3885}
3886
3887static inline void l2cap_sig_channel(struct l2cap_conn *conn,
3888 struct sk_buff *skb)
1da177e4
LT		 3889{
3890 u8 *data = skb->data;
3891 int len = skb->len;
3892 struct l2cap_cmd_hdr cmd;
3300d9a9 3893 int err;
1da177e4
LT		 3894
3895 l2cap_raw_recv(conn, skb);
3896
3897 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3898 u16 cmd_len;
1da177e4
LT		 3899 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3900 data += L2CAP_CMD_HDR_SIZE;
3901 len -= L2CAP_CMD_HDR_SIZE;
3902
88219a0f 3903 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3904
88219a0f 3905 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3906
88219a0f 3907 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3908 BT_DBG("corrupted command");
3909 break;
3910 }
3911
3300d9a9
CT		 3912 if (conn->hcon->type == LE_LINK)
3913 err = l2cap_le_sig_cmd(conn, &cmd, data);
3914 else
3915 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 3916
3917 if (err) {
e2fd318e 3918 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 3919
3920 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 3921
3922 /* FIXME: Map err to a valid reason */
e2fd318e 3923 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
1da177e4
LT		 3924 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3925 }
3926
88219a0f
AV		 3927 data += cmd_len;
3928 len -= cmd_len;
1da177e4
LT		 3929 }
3930
3931 kfree_skb(skb);
3932}
3933
47d1ec61 3934static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 3935{
3936 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 3937 int hdr_size;
3938
3939 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3940 hdr_size = L2CAP_EXT_HDR_SIZE;
3941 else
3942 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 3943
47d1ec61 3944 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 3945 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 3946 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3947 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3948
3949 if (our_fcs != rcv_fcs)
7a560e5c 3950 return -EBADMSG;
fcc203c3
GP		 3951 }
3952 return 0;
3953}
3954
525cd185 3955static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 3956{
88843ab0 3957 u32 control = 0;
d5392c8f 3958
6a026610 3959 chan->frames_sent = 0;
d5392c8f 3960
0b209fae 3961 control |= __set_reqseq(chan, chan->buffer_seq);
d5392c8f 3962
e2ab4353 3963 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 3964 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
525cd185 3965 l2cap_send_sframe(chan, control);
e2ab4353 3966 set_bit(CONN_RNR_SENT, &chan->conn_state);
d5392c8f
GP		 3967 }
3968
e2ab4353 3969 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
525cd185 3970 l2cap_retransmit_frames(chan);
d5392c8f 3971
525cd185 3972 l2cap_ertm_send(chan);
d5392c8f 3973
e2ab4353 3974 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
6a026610 3975 chan->frames_sent == 0) {
ab784b73 3976 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 3977 l2cap_send_sframe(chan, control);
d5392c8f
GP		 3978 }
3979}
3980
fb45de7d 3981static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar)
8f17154f
GP		 3982{
3983 struct sk_buff *next_skb;
bfbacc11 3984 int tx_seq_offset, next_tx_seq_offset;
8f17154f 3985
3ce3514f
MM		 3986 bt_cb(skb)->control.txseq = tx_seq;
3987 bt_cb(skb)->control.sar = sar;
8f17154f 3988
f1c6775b 3989 next_skb = skb_peek(&chan->srej_q);
8f17154f 3990
836be934 3991 tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
bfbacc11 3992
039d9572 3993 while (next_skb) {
3ce3514f 3994 if (bt_cb(next_skb)->control.txseq == tx_seq)
9b53350d
JPRV		 3995 return -EINVAL;
3996
836be934 3997 next_tx_seq_offset = __seq_offset(chan,
3ce3514f 3998 bt_cb(next_skb)->control.txseq, chan->buffer_seq);
bfbacc11
JPRV		 3999
4000 if (next_tx_seq_offset > tx_seq_offset) {
f1c6775b 4001 __skb_queue_before(&chan->srej_q, next_skb, skb);
9b53350d 4002 return 0;
8f17154f
GP		 4003 }
4004
f1c6775b 4005 if (skb_queue_is_last(&chan->srej_q, next_skb))
039d9572
SJ		 4006 next_skb = NULL;
4007 else
4008 next_skb = skb_queue_next(&chan->srej_q, next_skb);
4009 }
8f17154f 4010
f1c6775b 4011 __skb_queue_tail(&chan->srej_q, skb);
9b53350d
JPRV		 4012
4013 return 0;
8f17154f
GP		 4014}
4015
84084a31
MM		 4016static void append_skb_frag(struct sk_buff *skb,
4017 struct sk_buff *new_frag, struct sk_buff **last_frag)
18778a63 4018{
84084a31
MM		 4019 /* skb->len reflects data in skb as well as all fragments
4020 * skb->data_len reflects only data in fragments
4021 */
4022 if (!skb_has_frag_list(skb))
4023 skb_shinfo(skb)->frag_list = new_frag;
4024
4025 new_frag->next = NULL;
4026
4027 (*last_frag)->next = new_frag;
4028 *last_frag = new_frag;
4029
4030 skb->len += new_frag->len;
4031 skb->data_len += new_frag->len;
4032 skb->truesize += new_frag->truesize;
4033}
4034
88843ab0 4035static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control)
84084a31
MM		 4036{
4037 int err = -EINVAL;
18778a63 4038
7e0ef6ee
AE		 4039 switch (__get_ctrl_sar(chan, control)) {
4040 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 4041 if (chan->sdu)
4042 break;
18778a63 4043
84084a31
MM		 4044 err = chan->ops->recv(chan->data, skb);
4045 break;
18778a63 4046
7e0ef6ee 4047 case L2CAP_SAR_START:
84084a31
MM		 4048 if (chan->sdu)
4049 break;
18778a63 4050
6f61fd47 4051 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 4052 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 4053
84084a31
MM		 4054 if (chan->sdu_len > chan->imtu) {
4055 err = -EMSGSIZE;
4056 break;
4057 }
1890d36b 4058
84084a31
MM		 4059 if (skb->len >= chan->sdu_len)
4060 break;
18778a63 4061
84084a31
MM		 4062 chan->sdu = skb;
4063 chan->sdu_last_frag = skb;
18778a63 4064
84084a31
MM		 4065 skb = NULL;
4066 err = 0;
18778a63
GP		 4067 break;
4068
7e0ef6ee 4069 case L2CAP_SAR_CONTINUE:
6f61fd47 4070 if (!chan->sdu)
84084a31 4071 break;
18778a63 4072
84084a31
MM		 4073 append_skb_frag(chan->sdu, skb,
4074 &chan->sdu_last_frag);
4075 skb = NULL;
18778a63 4076
84084a31
MM		 4077 if (chan->sdu->len >= chan->sdu_len)
4078 break;
4178ba46 4079
84084a31 4080 err = 0;
18778a63
GP		 4081 break;
4082
7e0ef6ee 4083 case L2CAP_SAR_END:
6f61fd47 4084 if (!chan->sdu)
84084a31 4085 break;
18778a63 4086
84084a31
MM		 4087 append_skb_frag(chan->sdu, skb,
4088 &chan->sdu_last_frag);
4089 skb = NULL;
4178ba46 4090
84084a31
MM		 4091 if (chan->sdu->len != chan->sdu_len)
4092 break;
18778a63 4093
84084a31 4094 err = chan->ops->recv(chan->data, chan->sdu);
1890d36b 4095
84084a31
MM		 4096 if (!err) {
4097 /* Reassembly complete */
4098 chan->sdu = NULL;
4099 chan->sdu_last_frag = NULL;
4100 chan->sdu_len = 0;
1890d36b 4101 }
18778a63
GP		 4102 break;
4103 }
4104
84084a31
MM		 4105 if (err) {
4106 kfree_skb(skb);
4107 kfree_skb(chan->sdu);
4108 chan->sdu = NULL;
4109 chan->sdu_last_frag = NULL;
4110 chan->sdu_len = 0;
4111 }
18778a63 4112
84084a31 4113 return err;
18778a63
GP		 4114}
4115
26f880d2 4116static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan)
712132eb 4117{
26f880d2 4118 BT_DBG("chan %p, Enter local busy", chan);
712132eb 4119
26f880d2 4120 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3c588192 4121 l2cap_seq_list_clear(&chan->srej_list);
26f880d2 4122
77f918bc 4123 __set_ack_timer(chan);
26f880d2
MM		 4124}
4125
4126static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan)
4127{
88843ab0 4128 u32 control;
712132eb 4129
e2ab4353 4130 if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
712132eb
GP		 4131 goto done;
4132
0b209fae 4133 control = __set_reqseq(chan, chan->buffer_seq);
e3781735 4134 control |= __set_ctrl_poll(chan);
ab784b73 4135 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 4136 l2cap_send_sframe(chan, control);
6a026610 4137 chan->retry_count = 1;
712132eb 4138
1a09bcb9
GP		 4139 __clear_retrans_timer(chan);
4140 __set_monitor_timer(chan);
712132eb 4141
e2ab4353 4142 set_bit(CONN_WAIT_F, &chan->conn_state);
712132eb
GP		 4143
4144done:
e2ab4353
GP		 4145 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
4146 clear_bit(CONN_RNR_SENT, &chan->conn_state);
712132eb 4147
49208c9c 4148 BT_DBG("chan %p, Exit local busy", chan);
712132eb
GP		 4149}
4150
e328140f 4151void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
1890d36b 4152{
e328140f
MM		 4153 if (chan->mode == L2CAP_MODE_ERTM) {
4154 if (busy)
4155 l2cap_ertm_enter_local_busy(chan);
4156 else
4157 l2cap_ertm_exit_local_busy(chan);
1890d36b 4158 }
1890d36b
GP		 4159}
4160
fb45de7d 4161static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq)
8f17154f
GP		 4162{
4163 struct sk_buff *skb;
88843ab0 4164 u32 control;
8f17154f 4165
e328140f
MM		 4166 while ((skb = skb_peek(&chan->srej_q)) &&
4167 !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4168 int err;
4169
3ce3514f 4170 if (bt_cb(skb)->control.txseq != tx_seq)
8f17154f
GP		 4171 break;
4172
f1c6775b 4173 skb = skb_dequeue(&chan->srej_q);
3ce3514f 4174 control = __set_ctrl_sar(chan, bt_cb(skb)->control.sar);
84084a31 4175 err = l2cap_reassemble_sdu(chan, skb, control);
e328140f
MM		 4176
4177 if (err < 0) {
4178 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4179 break;
4180 }
4181
836be934
AE		 4182 chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej);
4183 tx_seq = __next_seq(chan, tx_seq);
8f17154f
GP		 4184 }
4185}
4186
fb45de7d 4187static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 4188{
8f17154f 4189 struct srej_list *l, *tmp;
88843ab0 4190 u32 control;
8f17154f 4191
39d5a3ee 4192 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
8f17154f
GP		 4193 if (l->tx_seq == tx_seq) {
4194 list_del(&l->list);
4195 kfree(l);
4196 return;
4197 }
ab784b73 4198 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
0b209fae 4199 control |= __set_reqseq(chan, l->tx_seq);
525cd185 4200 l2cap_send_sframe(chan, control);
8f17154f 4201 list_del(&l->list);
39d5a3ee 4202 list_add_tail(&l->list, &chan->srej_l);
8f17154f
GP		 4203 }
4204}
4205
aef89f21 4206static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 4207{
8f17154f 4208 struct srej_list *new;
88843ab0 4209 u32 control;
8f17154f 4210
42e5c802 4211 while (tx_seq != chan->expected_tx_seq) {
ab784b73 4212 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
0b209fae 4213 control |= __set_reqseq(chan, chan->expected_tx_seq);
3c588192 4214 l2cap_seq_list_append(&chan->srej_list, chan->expected_tx_seq);
525cd185 4215 l2cap_send_sframe(chan, control);
8f17154f
GP		 4216
4217 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
aef89f21
SJ		 4218 if (!new)
4219 return -ENOMEM;
4220
42e5c802 4221 new->tx_seq = chan->expected_tx_seq;
836be934
AE		 4222
4223 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
4224
39d5a3ee 4225 list_add_tail(&new->list, &chan->srej_l);
8f17154f 4226 }
836be934
AE		 4227
4228 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
aef89f21
SJ		 4229
4230 return 0;
8f17154f
GP		 4231}
4232
88843ab0 4233static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
1c2acffb 4234{
fb45de7d 4235 u16 tx_seq = __get_txseq(chan, rx_control);
0b209fae 4236 u16 req_seq = __get_reqseq(chan, rx_control);
7e0ef6ee 4237 u8 sar = __get_ctrl_sar(chan, rx_control);
f6337c77 4238 int tx_seq_offset, expected_tx_seq_offset;
47d1ec61 4239 int num_to_ack = (chan->tx_win/6) + 1;
1c2acffb
GP		 4240 int err = 0;
4241
88843ab0 4242 BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len,
525cd185 4243 tx_seq, rx_control);
1c2acffb 4244
03f6715d 4245 if (__is_ctrl_final(chan, rx_control) &&
e2ab4353 4246 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1a09bcb9 4247 __clear_monitor_timer(chan);
6a026610 4248 if (chan->unacked_frames > 0)
1a09bcb9 4249 __set_retrans_timer(chan);
e2ab4353 4250 clear_bit(CONN_WAIT_F, &chan->conn_state);
1d8f5d16
GP		 4251 }
4252
42e5c802
GP		 4253 chan->expected_ack_seq = req_seq;
4254 l2cap_drop_acked_frames(chan);
9f121a5a 4255
836be934 4256 tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
9b53350d
JPRV		 4257
4258 /* invalid tx_seq */
47d1ec61 4259 if (tx_seq_offset >= chan->tx_win) {
8c1d787b 4260 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
9b53350d
JPRV		 4261 goto drop;
4262 }
4263
77f918bc
SJ		 4264 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4265 if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
4266 l2cap_send_ack(chan);
1890d36b 4267 goto drop;
77f918bc 4268 }
1890d36b 4269
02f1b641
MM		 4270 if (tx_seq == chan->expected_tx_seq)
4271 goto expected;
4272
e2ab4353 4273 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
8f17154f 4274 struct srej_list *first;
30afb5b2 4275
39d5a3ee 4276 first = list_first_entry(&chan->srej_l,
8f17154f
GP		 4277 struct srej_list, list);
4278 if (tx_seq == first->tx_seq) {
42e5c802 4279 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
525cd185 4280 l2cap_check_srej_gap(chan, tx_seq);
8f17154f
GP		 4281
4282 list_del(&first->list);
4283 kfree(first);
4284
39d5a3ee 4285 if (list_empty(&chan->srej_l)) {
42e5c802 4286 chan->buffer_seq = chan->buffer_seq_srej;
e2ab4353 4287 clear_bit(CONN_SREJ_SENT, &chan->conn_state);
525cd185 4288 l2cap_send_ack(chan);
49208c9c 4289 BT_DBG("chan %p, Exit SREJ_SENT", chan);
8f17154f
GP		 4290 }
4291 } else {
4292 struct srej_list *l;
9b53350d
JPRV		 4293
4294 /* duplicated tx_seq */
42e5c802 4295 if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
9b53350d 4296 goto drop;
8f17154f 4297
39d5a3ee 4298 list_for_each_entry(l, &chan->srej_l, list) {
8f17154f 4299 if (l->tx_seq == tx_seq) {
525cd185 4300 l2cap_resend_srejframe(chan, tx_seq);
8f17154f
GP		 4301 return 0;
4302 }
4303 }
aef89f21
SJ		 4304
4305 err = l2cap_send_srejframe(chan, tx_seq);
4306 if (err < 0) {
4307 l2cap_send_disconn_req(chan->conn, chan, -err);
4308 return err;
4309 }
30afb5b2
GP		 4310 }
4311 } else {
836be934
AE		 4312 expected_tx_seq_offset = __seq_offset(chan,
4313 chan->expected_tx_seq, chan->buffer_seq);
9b53350d
JPRV		 4314
4315 /* duplicated tx_seq */
4316 if (tx_seq_offset < expected_tx_seq_offset)
4317 goto drop;
4318
e2ab4353 4319 set_bit(CONN_SREJ_SENT, &chan->conn_state);
1c2acffb 4320
49208c9c 4321 BT_DBG("chan %p, Enter SREJ", chan);
0e98958d 4322
39d5a3ee 4323 INIT_LIST_HEAD(&chan->srej_l);
42e5c802 4324 chan->buffer_seq_srej = chan->buffer_seq;
8f17154f 4325
f1c6775b 4326 __skb_queue_head_init(&chan->srej_q);
42e5c802 4327 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
8f17154f 4328
0ef3ef0f
SJ		 4329 /* Set P-bit only if there are some I-frames to ack. */
4330 if (__clear_ack_timer(chan))
4331 set_bit(CONN_SEND_PBIT, &chan->conn_state);
ef54fd93 4332
aef89f21
SJ		 4333 err = l2cap_send_srejframe(chan, tx_seq);
4334 if (err < 0) {
4335 l2cap_send_disconn_req(chan->conn, chan, -err);
4336 return err;
4337 }
1c2acffb 4338 }
30afb5b2
GP		 4339 return 0;
4340
8f17154f 4341expected:
836be934 4342 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
8f17154f 4343
e2ab4353 4344 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3ce3514f
MM		 4345 bt_cb(skb)->control.txseq = tx_seq;
4346 bt_cb(skb)->control.sar = sar;
f1c6775b 4347 __skb_queue_tail(&chan->srej_q, skb);
8f17154f
GP		 4348 return 0;
4349 }
4350
84084a31 4351 err = l2cap_reassemble_sdu(chan, skb, rx_control);
836be934
AE		 4352 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
4353
e328140f
MM		 4354 if (err < 0) {
4355 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4356 return err;
4357 }
2ece3684 4358
03f6715d 4359 if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4360 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 4361 l2cap_retransmit_frames(chan);
4ec10d97
GP		 4362 }
4363
c1b4f43b 4364
6a026610
GP		 4365 chan->num_acked = (chan->num_acked + 1) % num_to_ack;
4366 if (chan->num_acked == num_to_ack - 1)
525cd185 4367 l2cap_send_ack(chan);
4d611e4d
GP		 4368 else
4369 __set_ack_timer(chan);
9e917af1 4370
8f17154f 4371 return 0;
9b53350d
JPRV		 4372
4373drop:
4374 kfree_skb(skb);
4375 return 0;
1c2acffb
GP		 4376}
4377
88843ab0 4378static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control)
1c2acffb 4379{
88843ab0 4380 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan,
0b209fae 4381 __get_reqseq(chan, rx_control), rx_control);
0e98958d 4382
0b209fae 4383 chan->expected_ack_seq = __get_reqseq(chan, rx_control);
42e5c802 4384 l2cap_drop_acked_frames(chan);
1c2acffb 4385
e3781735 4386 if (__is_ctrl_poll(chan, rx_control)) {
e2ab4353
GP		 4387 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4388 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
4389 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
6a026610 4390 (chan->unacked_frames > 0))
1a09bcb9 4391 __set_retrans_timer(chan);
05fbd89d 4392
e2ab4353 4393 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
525cd185 4394 l2cap_send_srejtail(chan);
05fbd89d 4395 } else {
525cd185 4396 l2cap_send_i_or_rr_or_rnr(chan);
05fbd89d 4397 }
1d8f5d16 4398
03f6715d 4399 } else if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4400 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4ec10d97 4401
e2ab4353 4402 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 4403 l2cap_retransmit_frames(chan);
2246b2f1 4404
e072745f 4405 } else {
e2ab4353 4406 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
6a026610 4407 (chan->unacked_frames > 0))
1a09bcb9 4408 __set_retrans_timer(chan);
1c2acffb 4409
e2ab4353
GP		 4410 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4411 if (test_bit(CONN_SREJ_SENT, &chan->conn_state))
525cd185 4412 l2cap_send_ack(chan);
894718a6 4413 else
525cd185 4414 l2cap_ertm_send(chan);
e072745f
GP		 4415 }
4416}
2246b2f1 4417
88843ab0 4418static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4419{
0b209fae 4420 u16 tx_seq = __get_reqseq(chan, rx_control);
30afb5b2 4421
88843ab0 4422 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4423
e2ab4353 4424 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
e072745f 4425
42e5c802
GP		 4426 chan->expected_ack_seq = tx_seq;
4427 l2cap_drop_acked_frames(chan);
e072745f 4428
03f6715d 4429 if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4430 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 4431 l2cap_retransmit_frames(chan);
e072745f 4432 } else {
525cd185 4433 l2cap_retransmit_frames(chan);
30afb5b2 4434
e2ab4353
GP		 4435 if (test_bit(CONN_WAIT_F, &chan->conn_state))
4436 set_bit(CONN_REJ_ACT, &chan->conn_state);
e072745f
GP		 4437 }
4438}
88843ab0 4439static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4440{
0b209fae 4441 u16 tx_seq = __get_reqseq(chan, rx_control);
30afb5b2 4442
88843ab0 4443 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4444
e2ab4353 4445 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
2246b2f1 4446
e3781735 4447 if (__is_ctrl_poll(chan, rx_control)) {
42e5c802
GP		 4448 chan->expected_ack_seq = tx_seq;
4449 l2cap_drop_acked_frames(chan);
3cb123d1 4450
e2ab4353 4451 set_bit(CONN_SEND_FBIT, &chan->conn_state);
525cd185 4452 l2cap_retransmit_one_frame(chan, tx_seq);
dfc909be 4453
525cd185 4454 l2cap_ertm_send(chan);
dfc909be 4455
e2ab4353 4456 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
6a026610 4457 chan->srej_save_reqseq = tx_seq;
e2ab4353 4458 set_bit(CONN_SREJ_ACT, &chan->conn_state);
ef54fd93 4459 }
03f6715d 4460 } else if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4461 if (test_bit(CONN_SREJ_ACT, &chan->conn_state) &&
6a026610 4462 chan->srej_save_reqseq == tx_seq)
e2ab4353 4463 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
e072745f 4464 else
525cd185 4465 l2cap_retransmit_one_frame(chan, tx_seq);
e072745f 4466 } else {
525cd185 4467 l2cap_retransmit_one_frame(chan, tx_seq);
e2ab4353 4468 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
6a026610 4469 chan->srej_save_reqseq = tx_seq;
e2ab4353 4470 set_bit(CONN_SREJ_ACT, &chan->conn_state);
ef54fd93 4471 }
e072745f
GP		 4472 }
4473}
4474
88843ab0 4475static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4476{
0b209fae 4477 u16 tx_seq = __get_reqseq(chan, rx_control);
e072745f 4478
88843ab0 4479 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4480
e2ab4353 4481 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
42e5c802
GP		 4482 chan->expected_ack_seq = tx_seq;
4483 l2cap_drop_acked_frames(chan);
e072745f 4484
e3781735 4485 if (__is_ctrl_poll(chan, rx_control))
e2ab4353 4486 set_bit(CONN_SEND_FBIT, &chan->conn_state);
3cb123d1 4487
e2ab4353 4488 if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
1a09bcb9 4489 __clear_retrans_timer(chan);
e3781735 4490 if (__is_ctrl_poll(chan, rx_control))
525cd185 4491 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
99b0d4b7 4492 return;
e072745f 4493 }
99b0d4b7 4494
e3781735 4495 if (__is_ctrl_poll(chan, rx_control)) {
525cd185 4496 l2cap_send_srejtail(chan);
ab784b73
AE		 4497 } else {
4498 rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR);
4499 l2cap_send_sframe(chan, rx_control);
4500 }
e072745f
GP		 4501}
4502
88843ab0 4503static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
e072745f 4504{
88843ab0 4505 BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len);
e072745f 4506
03f6715d 4507 if (__is_ctrl_final(chan, rx_control) &&
e2ab4353 4508 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1a09bcb9 4509 __clear_monitor_timer(chan);
6a026610 4510 if (chan->unacked_frames > 0)
1a09bcb9 4511 __set_retrans_timer(chan);
e2ab4353 4512 clear_bit(CONN_WAIT_F, &chan->conn_state);
e072745f
GP		 4513 }
4514
ab784b73
AE		 4515 switch (__get_ctrl_super(chan, rx_control)) {
4516 case L2CAP_SUPER_RR:
525cd185 4517 l2cap_data_channel_rrframe(chan, rx_control);
8f17154f
GP		 4518 break;
4519
ab784b73 4520 case L2CAP_SUPER_REJ:
525cd185 4521 l2cap_data_channel_rejframe(chan, rx_control);
e072745f 4522 break;
2246b2f1 4523
ab784b73 4524 case L2CAP_SUPER_SREJ:
525cd185 4525 l2cap_data_channel_srejframe(chan, rx_control);
e072745f
GP		 4526 break;
4527
ab784b73 4528 case L2CAP_SUPER_RNR:
525cd185 4529 l2cap_data_channel_rnrframe(chan, rx_control);
1c2acffb
GP		 4530 break;
4531 }
4532
faaebd19 4533 kfree_skb(skb);
1c2acffb
GP		 4534 return 0;
4535}
4536
cad8f1d0 4537static int l2cap_ertm_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
218bb9df 4538{
88843ab0 4539 u32 control;
0b209fae 4540 u16 req_seq;
218bb9df
GP		 4541 int len, next_tx_seq_offset, req_seq_offset;
4542
b76bbd66
MM		 4543 __unpack_control(chan, skb);
4544
88843ab0
AE		 4545 control = __get_control(chan, skb->data);
4546 skb_pull(skb, __ctrl_size(chan));
218bb9df
GP		 4547 len = skb->len;
4548
4549 /*
4550 * We can just drop the corrupted I-frame here.
4551 * Receiver will miss it and start proper recovery
4552 * procedures and ask retransmission.
4553 */
47d1ec61 4554 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 4555 goto drop;
4556
793c2f1c 4557 if (__is_sar_start(chan, control) && !__is_sframe(chan, control))
03a51213 4558 len -= L2CAP_SDULEN_SIZE;
218bb9df 4559
47d1ec61 4560 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 4561 len -= L2CAP_FCS_SIZE;
218bb9df 4562
47d1ec61 4563 if (len > chan->mps) {
8c1d787b 4564 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4565 goto drop;
4566 }
4567
0b209fae 4568 req_seq = __get_reqseq(chan, control);
218bb9df 4569
836be934
AE		 4570 req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq);
4571
4572 next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq,
4573 chan->expected_ack_seq);
218bb9df
GP		 4574
4575 /* check for invalid req-seq */
4576 if (req_seq_offset > next_tx_seq_offset) {
8c1d787b 4577 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4578 goto drop;
4579 }
4580
793c2f1c 4581 if (!__is_sframe(chan, control)) {
218bb9df 4582 if (len < 0) {
8c1d787b 4583 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4584 goto drop;
4585 }
4586
525cd185 4587 l2cap_data_channel_iframe(chan, control, skb);
218bb9df
GP		 4588 } else {
4589 if (len != 0) {
4590 BT_ERR("%d", len);
8c1d787b 4591 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4592 goto drop;
4593 }
4594
525cd185 4595 l2cap_data_channel_sframe(chan, control, skb);
218bb9df
GP		 4596 }
4597
4598 return 0;
4599
4600drop:
4601 kfree_skb(skb);
4602 return 0;
4603}
4604
1da177e4
LT		 4605static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4606{
48454079 4607 struct l2cap_chan *chan;
88843ab0 4608 u32 control;
fb45de7d 4609 u16 tx_seq;
218bb9df 4610 int len;
1da177e4 4611
baa7e1fa 4612 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 4613 if (!chan) {
1da177e4 4614 BT_DBG("unknown cid 0x%4.4x", cid);
6be36555 4615 /* Drop packet and return */
3379013b 4616 kfree_skb(skb);
6be36555 4617 return 0;
1da177e4
LT		 4618 }
4619
6be36555 4620 l2cap_chan_lock(chan);
6840ed07 4621
49208c9c 4622 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 4623
89bc500e 4624 if (chan->state != BT_CONNECTED)
1da177e4
LT		 4625 goto drop;
4626
0c1bc5c6 4627 switch (chan->mode) {
1c2acffb
GP		 4628 case L2CAP_MODE_BASIC:
4629 /* If socket recv buffers overflows we drop data here
4630 * which is *bad* because L2CAP has to be reliable.
4631 * But we don't have any other choice. L2CAP doesn't
4632 * provide flow control mechanism. */
1da177e4 4633
0c1bc5c6 4634 if (chan->imtu < skb->len)
1c2acffb 4635 goto drop;
1da177e4 4636
23070494 4637 if (!chan->ops->recv(chan->data, skb))
1c2acffb
GP		 4638 goto done;
4639 break;
4640
4641 case L2CAP_MODE_ERTM:
5ef8cb9e 4642 l2cap_ertm_data_rcv(chan, skb);
1c2acffb 4643
fcafde2e 4644 goto done;
1c2acffb 4645
6840ed07 4646 case L2CAP_MODE_STREAMING:
88843ab0
AE		 4647 control = __get_control(chan, skb->data);
4648 skb_pull(skb, __ctrl_size(chan));
6840ed07
GP		 4649 len = skb->len;
4650
47d1ec61 4651 if (l2cap_check_fcs(chan, skb))
26000089
GP		 4652 goto drop;
4653
7e0ef6ee 4654 if (__is_sar_start(chan, control))
03a51213 4655 len -= L2CAP_SDULEN_SIZE;
6840ed07 4656
47d1ec61 4657 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 4658 len -= L2CAP_FCS_SIZE;
fcc203c3 4659
793c2f1c 4660 if (len > chan->mps || len < 0 || __is_sframe(chan, control))
6840ed07
GP		 4661 goto drop;
4662
fb45de7d 4663 tx_seq = __get_txseq(chan, control);
6840ed07 4664
84084a31
MM		 4665 if (chan->expected_tx_seq != tx_seq) {
4666 /* Frame(s) missing - must discard partial SDU */
4667 kfree_skb(chan->sdu);
4668 chan->sdu = NULL;
4669 chan->sdu_last_frag = NULL;
4670 chan->sdu_len = 0;
6840ed07 4671
84084a31
MM		 4672 /* TODO: Notify userland of missing data */
4673 }
4674
836be934 4675 chan->expected_tx_seq = __next_seq(chan, tx_seq);
84084a31
MM		 4676
4677 if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE)
4678 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
6840ed07
GP		 4679
4680 goto done;
4681
1c2acffb 4682 default:
0c1bc5c6 4683 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 4684 break;
4685 }
1da177e4
LT		 4686
4687drop:
4688 kfree_skb(skb);
4689
4690done:
6be36555 4691 l2cap_chan_unlock(chan);
0139418c 4692
1da177e4
LT		 4693 return 0;
4694}
4695
8e036fc3 4696static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4 4697{
23691d75 4698 struct l2cap_chan *chan;
1da177e4 4699
c2287681 4700 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 4701 if (!chan)
1da177e4
LT		 4702 goto drop;
4703
5b4cedaa 4704 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 4705
89bc500e 4706 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 4707 goto drop;
4708
e13e21dc 4709 if (chan->imtu < skb->len)
1da177e4
LT		 4710 goto drop;
4711
23070494 4712 if (!chan->ops->recv(chan->data, skb))
5b4cedaa 4713 return 0;
1da177e4
LT		 4714
4715drop:
4716 kfree_skb(skb);
4717
1da177e4
LT		 4718 return 0;
4719}
4720
d9b88702
AE		 4721static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid,
4722 struct sk_buff *skb)
9f69bda6 4723{
23691d75 4724 struct l2cap_chan *chan;
9f69bda6 4725
c2287681 4726 chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst);
23691d75 4727 if (!chan)
9f69bda6
GP		 4728 goto drop;
4729
5b4cedaa 4730 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 4731
89bc500e 4732 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 4733 goto drop;
4734
e13e21dc 4735 if (chan->imtu < skb->len)
9f69bda6
GP		 4736 goto drop;
4737
23070494 4738 if (!chan->ops->recv(chan->data, skb))
5b4cedaa 4739 return 0;
9f69bda6
GP		 4740
4741drop:
4742 kfree_skb(skb);
4743
9f69bda6
GP		 4744 return 0;
4745}
4746
1da177e4
LT		 4747static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4748{
4749 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4750 u16 cid, len;
4751 __le16 psm;
1da177e4
LT		 4752
4753 skb_pull(skb, L2CAP_HDR_SIZE);
4754 cid = __le16_to_cpu(lh->cid);
4755 len = __le16_to_cpu(lh->len);
4756
1c2acffb
GP		 4757 if (len != skb->len) {
4758 kfree_skb(skb);
4759 return;
4760 }
4761
1da177e4
LT		 4762 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4763
4764 switch (cid) {
3300d9a9 4765 case L2CAP_CID_LE_SIGNALING:
8db4dc46 4766 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4767 l2cap_sig_channel(conn, skb);
4768 break;
4769
8db4dc46 4770 case L2CAP_CID_CONN_LESS:
097db76c 4771 psm = get_unaligned((__le16 *) skb->data);
1da177e4
LT		 4772 skb_pull(skb, 2);
4773 l2cap_conless_channel(conn, psm, skb);
4774 break;
4775
9f69bda6
GP		 4776 case L2CAP_CID_LE_DATA:
4777 l2cap_att_channel(conn, cid, skb);
4778 break;
4779
b501d6a1
AB		 4780 case L2CAP_CID_SMP:
4781 if (smp_sig_channel(conn, skb))
4782 l2cap_conn_del(conn->hcon, EACCES);
4783 break;
4784
1da177e4
LT		 4785 default:
4786 l2cap_data_channel(conn, cid, skb);
4787 break;
4788 }
4789}
4790
4791/* ---- L2CAP interface with lower layer (HCI) ---- */
4792
686ebf28 4793int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 4794{
4795 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 4796 struct l2cap_chan *c;
1da177e4 4797
1da177e4
LT		 4798 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4799
4800 /* Find listening sockets and check their link_mode */
23691d75
GP		 4801 read_lock(&chan_list_lock);
4802 list_for_each_entry(c, &chan_list, global_l) {
4803 struct sock *sk = c->sk;
4343478f 4804
89bc500e 4805 if (c->state != BT_LISTEN)
1da177e4
LT		 4806 continue;
4807
4808 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 4809 lm1 |= HCI_LM_ACCEPT;
43bd0f32 4810 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 4811 lm1 |= HCI_LM_MASTER;
1da177e4 4812 exact++;
2af6b9d5
MH		 4813 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4814 lm2 |= HCI_LM_ACCEPT;
43bd0f32 4815 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 4816 lm2 |= HCI_LM_MASTER;
4817 }
1da177e4 4818 }
23691d75 4819 read_unlock(&chan_list_lock);
1da177e4
LT		 4820
4821 return exact ? lm1 : lm2;
4822}
4823
686ebf28 4824int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 4825{
0139418c
MH		 4826 struct l2cap_conn *conn;
4827
1da177e4
LT		 4828 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4829
1da177e4 4830 if (!status) {
1da177e4
LT		 4831 conn = l2cap_conn_add(hcon, status);
4832 if (conn)
4833 l2cap_conn_ready(conn);
0139418c 4834 } else
e175072f 4835 l2cap_conn_del(hcon, bt_to_errno(status));
1da177e4
LT		 4836
4837 return 0;
4838}
4839
686ebf28 4840int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 4841{
4842 struct l2cap_conn *conn = hcon->l2cap_data;
4843
4844 BT_DBG("hcon %p", hcon);
4845
686ebf28 4846 if (!conn)
9f5a0d7b 4847 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 4848 return conn->disc_reason;
4849}
4850
686ebf28 4851int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4852{
4853 BT_DBG("hcon %p reason %d", hcon, reason);
4854
e175072f 4855 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 4856 return 0;
4857}
4858
4343478f 4859static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 4860{
715ec005 4861 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 4862 return;
4863
f62e4323 4864 if (encrypt == 0x00) {
4343478f 4865 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 4866 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 4867 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 4868 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 4869 } else {
4343478f 4870 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 4871 __clear_chan_timer(chan);
f62e4323
MH		 4872 }
4873}
4874
686ebf28 4875int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 4876{
0139418c 4877 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 4878 struct l2cap_chan *chan;
1da177e4 4879
0139418c 4880 if (!conn)
1da177e4 4881 return 0;
0139418c 4882
1da177e4
LT		 4883 BT_DBG("conn %p", conn);
4884
160dc6ac 4885 if (hcon->type == LE_LINK) {
35d4adcc
HG		 4886 if (!status && encrypt)
4887 smp_distribute_keys(conn, 0);
17cd3f37 4888 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 4889 }
4890
3df91ea2 4891 mutex_lock(&conn->chan_lock);
1da177e4 4892
3df91ea2 4893 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 4894 l2cap_chan_lock(chan);
1da177e4 4895
f1cb9af5
VCG		 4896 BT_DBG("chan->scid %d", chan->scid);
4897
4898 if (chan->scid == L2CAP_CID_LE_DATA) {
4899 if (!status && encrypt) {
4900 chan->sec_level = hcon->sec_level;
cf4cd009 4901 l2cap_chan_ready(chan);
f1cb9af5
VCG		 4902 }
4903
6be36555 4904 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 4905 continue;
4906 }
4907
c1360a1c 4908 if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
6be36555 4909 l2cap_chan_unlock(chan);
6a8d3010
MH		 4910 continue;
4911 }
4912
89bc500e
GP		 4913 if (!status && (chan->state == BT_CONNECTED ||
4914 chan->state == BT_CONFIG)) {
4343478f 4915 l2cap_check_encryption(chan, encrypt);
6be36555 4916 l2cap_chan_unlock(chan);
9719f8af
MH		 4917 continue;
4918 }
4919
89bc500e 4920 if (chan->state == BT_CONNECT) {
b1235d79 4921 if (!status) {
9b27f350 4922 l2cap_send_conn_req(chan);
b1235d79 4923 } else {
ba13ccd9 4924 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 4925 }
89bc500e 4926 } else if (chan->state == BT_CONNECT2) {
6be36555 4927 struct sock *sk = chan->sk;
b1235d79 4928 struct l2cap_conn_rsp rsp;
df3c3931 4929 __u16 res, stat;
1da177e4 4930
6be36555
AE		 4931 lock_sock(sk);
4932
b1235d79 4933 if (!status) {
df3c3931
JH		 4934 if (bt_sk(sk)->defer_setup) {
4935 struct sock *parent = bt_sk(sk)->parent;
4936 res = L2CAP_CR_PEND;
4937 stat = L2CAP_CS_AUTHOR_PEND;
05e9a2f6
IK		 4938 if (parent)
4939 parent->sk_data_ready(parent, 0);
df3c3931 4940 } else {
0e587be7 4941 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 4942 res = L2CAP_CR_SUCCESS;
4943 stat = L2CAP_CS_NO_INFO;
4944 }
b1235d79 4945 } else {
0e587be7 4946 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 4947 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 4948 res = L2CAP_CR_SEC_BLOCK;
4949 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 4950 }
4951
6be36555
AE		 4952 release_sock(sk);
4953
fe4128e0
GP		 4954 rsp.scid = cpu_to_le16(chan->dcid);
4955 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 4956 rsp.result = cpu_to_le16(res);
4957 rsp.status = cpu_to_le16(stat);
fc7f8a7e
GP		 4958 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
4959 sizeof(rsp), &rsp);
b1235d79 4960 }
1da177e4 4961
6be36555 4962 l2cap_chan_unlock(chan);
1da177e4
LT		 4963 }
4964
3df91ea2 4965 mutex_unlock(&conn->chan_lock);
b1235d79 4966
1da177e4
LT		 4967 return 0;
4968}
4969
686ebf28 4970int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 4971{
4972 struct l2cap_conn *conn = hcon->l2cap_data;
4973
5a08ecce
AE		 4974 if (!conn)
4975 conn = l2cap_conn_add(hcon, 0);
4976
4977 if (!conn)
1da177e4
LT		 4978 goto drop;
4979
4980 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4981
e702112f 4982 if (!(flags & ACL_CONT)) {
1da177e4 4983 struct l2cap_hdr *hdr;
48454079 4984 struct l2cap_chan *chan;
89794813 4985 u16 cid;
1da177e4
LT		 4986 int len;
4987
4988 if (conn->rx_len) {
4989 BT_ERR("Unexpected start frame (len %d)", skb->len);
4990 kfree_skb(conn->rx_skb);
4991 conn->rx_skb = NULL;
4992 conn->rx_len = 0;
4993 l2cap_conn_unreliable(conn, ECOMM);
4994 }
4995
aae7fe22
AE		 4996 /* Start fragment always begin with Basic L2CAP header */
4997 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 4998 BT_ERR("Frame is too short (len %d)", skb->len);
4999 l2cap_conn_unreliable(conn, ECOMM);
5000 goto drop;
5001 }
5002
5003 hdr = (struct l2cap_hdr *) skb->data;
5004 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
89794813 5005 cid = __le16_to_cpu(hdr->cid);
1da177e4
LT		 5006
5007 if (len == skb->len) {
5008 /* Complete frame received */
5009 l2cap_recv_frame(conn, skb);
5010 return 0;
5011 }
5012
5013 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
5014
5015 if (skb->len > len) {
5016 BT_ERR("Frame is too long (len %d, expected len %d)",
5017 skb->len, len);
5018 l2cap_conn_unreliable(conn, ECOMM);
5019 goto drop;
5020 }
5021
baa7e1fa 5022 chan = l2cap_get_chan_by_scid(conn, cid);
89794813 5023
48454079
GP		 5024 if (chan && chan->sk) {
5025 struct sock *sk = chan->sk;
3df91ea2 5026 lock_sock(sk);
89794813 5027
0c1bc5c6 5028 if (chan->imtu < len - L2CAP_HDR_SIZE) {
48454079
GP		 5029 BT_ERR("Frame exceeding recv MTU (len %d, "
5030 "MTU %d)", len,
0c1bc5c6 5031 chan->imtu);
aa2ac881 5032 release_sock(sk);
48454079
GP		 5033 l2cap_conn_unreliable(conn, ECOMM);
5034 goto drop;
5035 }
aa2ac881 5036 release_sock(sk);
48454079 5037 }
89794813 5038
1da177e4 5039 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 5040 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
5041 if (!conn->rx_skb)
1da177e4
LT		 5042 goto drop;
5043
d626f62b 5044 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 5045 skb->len);
1da177e4
LT		 5046 conn->rx_len = len - skb->len;
5047 } else {
5048 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
5049
5050 if (!conn->rx_len) {
5051 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
5052 l2cap_conn_unreliable(conn, ECOMM);
5053 goto drop;
5054 }
5055
5056 if (skb->len > conn->rx_len) {
5057 BT_ERR("Fragment is too long (len %d, expected %d)",
5058 skb->len, conn->rx_len);
5059 kfree_skb(conn->rx_skb);
5060 conn->rx_skb = NULL;
5061 conn->rx_len = 0;
5062 l2cap_conn_unreliable(conn, ECOMM);
5063 goto drop;
5064 }
5065
d626f62b 5066 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 5067 skb->len);
1da177e4
LT		 5068 conn->rx_len -= skb->len;
5069
5070 if (!conn->rx_len) {
5071 /* Complete frame received */
5072 l2cap_recv_frame(conn, conn->rx_skb);
5073 conn->rx_skb = NULL;
5074 }
5075 }
5076
5077drop:
5078 kfree_skb(skb);
5079 return 0;
5080}
5081
aef7d97c 5082static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 5083{
23691d75 5084 struct l2cap_chan *c;
1da177e4 5085
333055f2 5086 read_lock(&chan_list_lock);
1da177e4 5087
23691d75
GP		 5088 list_for_each_entry(c, &chan_list, global_l) {
5089 struct sock *sk = c->sk;
101545f6 5090
903d343e 5091 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
aef7d97c
MH		 5092 batostr(&bt_sk(sk)->src),
5093 batostr(&bt_sk(sk)->dst),
89bc500e 5094 c->state, __le16_to_cpu(c->psm),
23691d75
GP		 5095 c->scid, c->dcid, c->imtu, c->omtu,
5096 c->sec_level, c->mode);
61e1b4b7 5097 }
1da177e4 5098
333055f2 5099 read_unlock(&chan_list_lock);
1da177e4 5100
aef7d97c 5101 return 0;
1da177e4
LT		 5102}
5103
aef7d97c
MH		 5104static int l2cap_debugfs_open(struct inode *inode, struct file *file)
5105{
5106 return single_open(file, l2cap_debugfs_show, inode->i_private);
5107}
5108
5109static const struct file_operations l2cap_debugfs_fops = {
5110 .open = l2cap_debugfs_open,
5111 .read = seq_read,
5112 .llseek = seq_lseek,
5113 .release = single_release,
5114};
5115
5116static struct dentry *l2cap_debugfs;
1da177e4 5117
64274518 5118int __init l2cap_init(void)
1da177e4
LT		 5119{
5120 int err;
be9d1227 5121
bb58f747 5122 err = l2cap_init_sockets();
1da177e4
LT		 5123 if (err < 0)
5124 return err;
5125
aef7d97c
MH		 5126 if (bt_debugfs) {
5127 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
5128 bt_debugfs, NULL, &l2cap_debugfs_fops);
5129 if (!l2cap_debugfs)
5130 BT_ERR("Failed to create L2CAP debug file");
5131 }
1da177e4 5132
1da177e4 5133 return 0;
1da177e4
LT		 5134}
5135
64274518 5136void l2cap_exit(void)
1da177e4 5137{
aef7d97c 5138 debugfs_remove(l2cap_debugfs);
bb58f747 5139 l2cap_cleanup_sockets();
1da177e4
LT		 5140}
5141
d1c4a17d
GP		 5142module_param(disable_ertm, bool, 0644);
5143MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
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