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Bluetooth: Simplify the ERTM ack timeout
[GitHub/mt8127/android_kernel_alcatel_ttab.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
b191e031 60bool disable_ertm = 1;
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 73static void l2cap_send_disconn_req(struct l2cap_conn *conn,
c5daa683 74 struct l2cap_chan *chan, int err);
1da177e4 75
608bcc6d
MM		 76static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
77 struct sk_buff_head *skbs, u8 event);
78
0139418c 79/* ---- L2CAP channels ---- */
71ba0e56 80
baa7e1fa 81static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
0139418c 82{
3df91ea2 83 struct l2cap_chan *c;
3d57dc68 84
3df91ea2
AE		 85 list_for_each_entry(c, &conn->chan_l, list) {
86 if (c->dcid == cid)
87 return c;
0139418c 88 }
3df91ea2 89 return NULL;
0139418c
MH		 90}
91
baa7e1fa 92static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 93{
3df91ea2 94 struct l2cap_chan *c;
3d57dc68 95
3df91ea2
AE		 96 list_for_each_entry(c, &conn->chan_l, list) {
97 if (c->scid == cid)
98 return c;
0139418c 99 }
3df91ea2 100 return NULL;
0139418c
MH		 101}
102
103/* Find channel with given SCID.
ef191ade 104 * Returns locked channel. */
baa7e1fa 105static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 106{
48454079 107 struct l2cap_chan *c;
baa7e1fa 108
3df91ea2 109 mutex_lock(&conn->chan_lock);
baa7e1fa 110 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 111 if (c)
112 l2cap_chan_lock(c);
3df91ea2
AE		 113 mutex_unlock(&conn->chan_lock);
114
48454079 115 return c;
0139418c
MH		 116}
117
baa7e1fa 118static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 119{
3df91ea2 120 struct l2cap_chan *c;
3d57dc68 121
3df91ea2
AE		 122 list_for_each_entry(c, &conn->chan_l, list) {
123 if (c->ident == ident)
124 return c;
0139418c 125 }
3df91ea2 126 return NULL;
0139418c
MH		 127}
128
23691d75 129static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 130{
23691d75 131 struct l2cap_chan *c;
9e4425ff 132
23691d75
GP		 133 list_for_each_entry(c, &chan_list, global_l) {
134 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
250938cb 135 return c;
9e4425ff 136 }
250938cb 137 return NULL;
9e4425ff
GP		 138}
139
140int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
141{
73b2ec18
GP		 142 int err;
143
333055f2 144 write_lock(&chan_list_lock);
9e4425ff 145
23691d75 146 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 147 err = -EADDRINUSE;
148 goto done;
9e4425ff
GP		 149 }
150
73b2ec18
GP		 151 if (psm) {
152 chan->psm = psm;
153 chan->sport = psm;
154 err = 0;
155 } else {
156 u16 p;
157
158 err = -EINVAL;
159 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 160 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 161 chan->psm = cpu_to_le16(p);
162 chan->sport = cpu_to_le16(p);
163 err = 0;
164 break;
165 }
166 }
9e4425ff 167
73b2ec18 168done:
333055f2 169 write_unlock(&chan_list_lock);
73b2ec18 170 return err;
9e4425ff
GP		 171}
172
173int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
174{
333055f2 175 write_lock(&chan_list_lock);
9e4425ff
GP		 176
177 chan->scid = scid;
178
333055f2 179 write_unlock(&chan_list_lock);
9e4425ff
GP		 180
181 return 0;
182}
183
baa7e1fa 184static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 185{
8db4dc46 186 u16 cid = L2CAP_CID_DYN_START;
0139418c 187
8db4dc46 188 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 189 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 190 return cid;
191 }
192
193 return 0;
194}
195
0e587be7 196static void __l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 197{
42d2d87c 198 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
badaaa00
GP		 199 state_to_string(state));
200
89bc500e
GP		 201 chan->state = state;
202 chan->ops->state_change(chan->data, state);
203}
204
0e587be7
AE		 205static void l2cap_state_change(struct l2cap_chan *chan, int state)
206{
207 struct sock *sk = chan->sk;
208
209 lock_sock(sk);
210 __l2cap_state_change(chan, state);
211 release_sock(sk);
212}
213
2e0052e4
AE		 214static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err)
215{
216 struct sock *sk = chan->sk;
217
218 sk->sk_err = err;
219}
220
221static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
222{
223 struct sock *sk = chan->sk;
224
225 lock_sock(sk);
226 __l2cap_chan_set_err(chan, err);
227 release_sock(sk);
228}
229
4239d16f
MM		 230static void __set_retrans_timer(struct l2cap_chan *chan)
231{
232 if (!delayed_work_pending(&chan->monitor_timer) &&
233 chan->retrans_timeout) {
234 l2cap_set_timer(chan, &chan->retrans_timer,
235 msecs_to_jiffies(chan->retrans_timeout));
236 }
237}
238
239static void __set_monitor_timer(struct l2cap_chan *chan)
240{
241 __clear_retrans_timer(chan);
242 if (chan->monitor_timeout) {
243 l2cap_set_timer(chan, &chan->monitor_timer,
244 msecs_to_jiffies(chan->monitor_timeout));
245 }
246}
247
608bcc6d
MM		 248static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
249 u16 seq)
250{
251 struct sk_buff *skb;
252
253 skb_queue_walk(head, skb) {
254 if (bt_cb(skb)->control.txseq == seq)
255 return skb;
256 }
257
258 return NULL;
259}
260
3c588192
MM		 261/* ---- L2CAP sequence number lists ---- */
262
263/* For ERTM, ordered lists of sequence numbers must be tracked for
264 * SREJ requests that are received and for frames that are to be
265 * retransmitted. These seq_list functions implement a singly-linked
266 * list in an array, where membership in the list can also be checked
267 * in constant time. Items can also be added to the tail of the list
268 * and removed from the head in constant time, without further memory
269 * allocs or frees.
270 */
271
272static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
273{
274 size_t alloc_size, i;
275
276 /* Allocated size is a power of 2 to map sequence numbers
277 * (which may be up to 14 bits) in to a smaller array that is
278 * sized for the negotiated ERTM transmit windows.
279 */
280 alloc_size = roundup_pow_of_two(size);
281
282 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
283 if (!seq_list->list)
284 return -ENOMEM;
285
286 seq_list->mask = alloc_size - 1;
287 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
288 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
289 for (i = 0; i < alloc_size; i++)
290 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
291
292 return 0;
293}
294
295static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
296{
297 kfree(seq_list->list);
298}
299
300static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
301 u16 seq)
302{
303 /* Constant-time check for list membership */
304 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
305}
306
307static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
308{
309 u16 mask = seq_list->mask;
310
311 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
312 /* In case someone tries to pop the head of an empty list */
313 return L2CAP_SEQ_LIST_CLEAR;
314 } else if (seq_list->head == seq) {
315 /* Head can be removed in constant time */
316 seq_list->head = seq_list->list[seq & mask];
317 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
318
319 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
320 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
321 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
322 }
323 } else {
324 /* Walk the list to find the sequence number */
325 u16 prev = seq_list->head;
326 while (seq_list->list[prev & mask] != seq) {
327 prev = seq_list->list[prev & mask];
328 if (prev == L2CAP_SEQ_LIST_TAIL)
329 return L2CAP_SEQ_LIST_CLEAR;
330 }
331
332 /* Unlink the number from the list and clear it */
333 seq_list->list[prev & mask] = seq_list->list[seq & mask];
334 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
335 if (seq_list->tail == seq)
336 seq_list->tail = prev;
337 }
338 return seq;
339}
340
341static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
342{
343 /* Remove the head in constant time */
344 return l2cap_seq_list_remove(seq_list, seq_list->head);
345}
346
347static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
348{
f522ae36 349 u16 i;
3c588192 350
f522ae36
GP		 351 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
352 return;
353
354 for (i = 0; i <= seq_list->mask; i++)
355 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
356
357 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
358 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 359}
360
361static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
362{
363 u16 mask = seq_list->mask;
364
365 /* All appends happen in constant time */
366
f522ae36
GP		 367 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
368 return;
3c588192 369
f522ae36
GP		 370 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
371 seq_list->head = seq;
372 else
373 seq_list->list[seq_list->tail & mask] = seq;
374
375 seq_list->tail = seq;
376 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 377}
378
721c4181 379static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 380{
721c4181
GP		 381 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
382 chan_timer.work);
3df91ea2 383 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 384 int reason;
385
e05dcc32 386 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 387
3df91ea2 388 mutex_lock(&conn->chan_lock);
6be36555 389 l2cap_chan_lock(chan);
ab07801d 390
89bc500e 391 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 392 reason = ECONNREFUSED;
89bc500e 393 else if (chan->state == BT_CONNECT &&
ab07801d
GP		 394 chan->sec_level != BT_SECURITY_SDP)
395 reason = ECONNREFUSED;
396 else
397 reason = ETIMEDOUT;
398
0f852724 399 l2cap_chan_close(chan, reason);
ab07801d 400
6be36555 401 l2cap_chan_unlock(chan);
ab07801d 402
ba3bd0ee 403 chan->ops->close(chan->data);
3df91ea2
AE		 404 mutex_unlock(&conn->chan_lock);
405
371fd835 406 l2cap_chan_put(chan);
ab07801d
GP		 407}
408
eef1d9b6 409struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 410{
411 struct l2cap_chan *chan;
412
413 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
414 if (!chan)
415 return NULL;
416
c03b355e
AE		 417 mutex_init(&chan->lock);
418
333055f2 419 write_lock(&chan_list_lock);
23691d75 420 list_add(&chan->global_l, &chan_list);
333055f2 421 write_unlock(&chan_list_lock);
23691d75 422
721c4181 423 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 424
89bc500e
GP		 425 chan->state = BT_OPEN;
426
71ba0e56
GP		 427 atomic_set(&chan->refcnt, 1);
428
2827011f
MM		 429 /* This flag is cleared in l2cap_chan_ready() */
430 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
431
eef1d9b6 432 BT_DBG("chan %p", chan);
abc545b8 433
48454079
GP		 434 return chan;
435}
436
23691d75 437void l2cap_chan_destroy(struct l2cap_chan *chan)
6ff5abbf 438{
333055f2 439 write_lock(&chan_list_lock);
23691d75 440 list_del(&chan->global_l);
333055f2 441 write_unlock(&chan_list_lock);
23691d75 442
371fd835 443 l2cap_chan_put(chan);
6ff5abbf
GP		 444}
445
bd4b1653
AE		 446void l2cap_chan_set_defaults(struct l2cap_chan *chan)
447{
448 chan->fcs = L2CAP_FCS_CRC16;
449 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
450 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
451 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
452 chan->sec_level = BT_SECURITY_LOW;
453
454 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
455}
456
14a28491 457static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 458{
af05b30b 459 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 460 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 461
9f5a0d7b 462 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 463
8c1d787b 464 chan->conn = conn;
0139418c 465
5491120e
AE		 466 switch (chan->chan_type) {
467 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b
VT		 468 if (conn->hcon->type == LE_LINK) {
469 /* LE connection */
0c1bc5c6 470 chan->omtu = L2CAP_LE_DEFAULT_MTU;
fe4128e0
GP		 471 chan->scid = L2CAP_CID_LE_DATA;
472 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 473 } else {
474 /* Alloc CID for connection-oriented socket */
fe4128e0 475 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 476 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 477 }
5491120e
AE		 478 break;
479
480 case L2CAP_CHAN_CONN_LESS:
0139418c 481 /* Connectionless socket */
fe4128e0
GP		 482 chan->scid = L2CAP_CID_CONN_LESS;
483 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 484 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 485 break;
486
487 default:
0139418c 488 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 489 chan->scid = L2CAP_CID_SIGNALING;
490 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 491 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 492 }
493
8f7975b1
AE		 494 chan->local_id = L2CAP_BESTEFFORT_ID;
495 chan->local_stype = L2CAP_SERV_BESTEFFORT;
496 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
497 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
498 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
499 chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO;
500
371fd835 501 l2cap_chan_hold(chan);
baa7e1fa 502
3df91ea2 503 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 504}
505
14a28491 506static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 507{
508 mutex_lock(&conn->chan_lock);
509 __l2cap_chan_add(conn, chan);
3df91ea2 510 mutex_unlock(&conn->chan_lock);
0139418c
MH		 511}
512
4519de9a 513static void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 514{
48454079 515 struct sock *sk = chan->sk;
8c1d787b 516 struct l2cap_conn *conn = chan->conn;
0139418c
MH		 517 struct sock *parent = bt_sk(sk)->parent;
518
c9b66675 519 __clear_chan_timer(chan);
0139418c 520
49208c9c 521 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 522
8e87d142 523 if (conn) {
baa7e1fa 524 /* Delete from channel list */
3df91ea2 525 list_del(&chan->list);
3d57dc68 526
371fd835 527 l2cap_chan_put(chan);
baa7e1fa 528
8c1d787b 529 chan->conn = NULL;
0139418c
MH		 530 hci_conn_put(conn->hcon);
531 }
532
6be36555
AE		 533 lock_sock(sk);
534
0e587be7 535 __l2cap_state_change(chan, BT_CLOSED);
0139418c
MH		 536 sock_set_flag(sk, SOCK_ZAPPED);
537
538 if (err)
2e0052e4 539 __l2cap_chan_set_err(chan, err);
0139418c
MH		 540
541 if (parent) {
542 bt_accept_unlink(sk);
543 parent->sk_data_ready(parent, 0);
544 } else
545 sk->sk_state_change(sk);
c13ffa62 546
6be36555
AE		 547 release_sock(sk);
548
2827011f 549 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 550 return;
2ead70b8 551
58d35f87 552 skb_queue_purge(&chan->tx_q);
c13ffa62 553
0c1bc5c6 554 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 555 __clear_retrans_timer(chan);
556 __clear_monitor_timer(chan);
557 __clear_ack_timer(chan);
c13ffa62 558
f1c6775b 559 skb_queue_purge(&chan->srej_q);
c13ffa62 560
3c588192
MM		 561 l2cap_seq_list_free(&chan->srej_list);
562 l2cap_seq_list_free(&chan->retrans_list);
c13ffa62 563 }
0139418c
MH		 564}
565
4519de9a
GP		 566static void l2cap_chan_cleanup_listen(struct sock *parent)
567{
568 struct sock *sk;
569
570 BT_DBG("parent %p", parent);
571
572 /* Close not yet accepted channels */
0f852724 573 while ((sk = bt_accept_dequeue(parent, NULL))) {
ba3bd0ee 574 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
3df91ea2 575
6be36555 576 l2cap_chan_lock(chan);
c9b66675 577 __clear_chan_timer(chan);
ba3bd0ee 578 l2cap_chan_close(chan, ECONNRESET);
6be36555 579 l2cap_chan_unlock(chan);
3df91ea2 580
ba3bd0ee 581 chan->ops->close(chan->data);
0f852724 582 }
4519de9a
GP		 583}
584
0f852724 585void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 586{
587 struct l2cap_conn *conn = chan->conn;
588 struct sock *sk = chan->sk;
589
e05dcc32
AE		 590 BT_DBG("chan %p state %s sk %p", chan,
591 state_to_string(chan->state), sk);
4519de9a 592
89bc500e 593 switch (chan->state) {
4519de9a 594 case BT_LISTEN:
6be36555 595 lock_sock(sk);
4519de9a 596 l2cap_chan_cleanup_listen(sk);
89bc500e 597
0e587be7 598 __l2cap_state_change(chan, BT_CLOSED);
89bc500e 599 sock_set_flag(sk, SOCK_ZAPPED);
6be36555 600 release_sock(sk);
4519de9a
GP		 601 break;
602
603 case BT_CONNECTED:
604 case BT_CONFIG:
715ec005 605 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a 606 conn->hcon->type == ACL_LINK) {
c9b66675 607 __set_chan_timer(chan, sk->sk_sndtimeo);
4519de9a
GP		 608 l2cap_send_disconn_req(conn, chan, reason);
609 } else
610 l2cap_chan_del(chan, reason);
611 break;
612
613 case BT_CONNECT2:
715ec005 614 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a
GP		 615 conn->hcon->type == ACL_LINK) {
616 struct l2cap_conn_rsp rsp;
617 __u16 result;
618
c5daa683 619 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
4519de9a
GP		 620 result = L2CAP_CR_SEC_BLOCK;
621 else
622 result = L2CAP_CR_BAD_PSM;
89bc500e 623 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 624
625 rsp.scid = cpu_to_le16(chan->dcid);
626 rsp.dcid = cpu_to_le16(chan->scid);
627 rsp.result = cpu_to_le16(result);
628 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
629 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
630 sizeof(rsp), &rsp);
631 }
632
633 l2cap_chan_del(chan, reason);
634 break;
635
636 case BT_CONNECT:
637 case BT_DISCONN:
638 l2cap_chan_del(chan, reason);
639 break;
640
641 default:
6be36555 642 lock_sock(sk);
4519de9a 643 sock_set_flag(sk, SOCK_ZAPPED);
6be36555 644 release_sock(sk);
4519de9a
GP		 645 break;
646 }
647}
648
4343478f 649static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 650{
715ec005 651 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 652 switch (chan->sec_level) {
8556edd3
JH		 653 case BT_SECURITY_HIGH:
654 return HCI_AT_DEDICATED_BONDING_MITM;
655 case BT_SECURITY_MEDIUM:
656 return HCI_AT_DEDICATED_BONDING;
657 default:
658 return HCI_AT_NO_BONDING;
659 }
fe4128e0 660 } else if (chan->psm == cpu_to_le16(0x0001)) {
4343478f
GP		 661 if (chan->sec_level == BT_SECURITY_LOW)
662 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 663
4343478f 664 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 665 return HCI_AT_NO_BONDING_MITM;
00ae4af9 666 else
8556edd3 667 return HCI_AT_NO_BONDING;
00ae4af9 668 } else {
4343478f 669 switch (chan->sec_level) {
00ae4af9 670 case BT_SECURITY_HIGH:
8556edd3 671 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 672 case BT_SECURITY_MEDIUM:
8556edd3 673 return HCI_AT_GENERAL_BONDING;
00ae4af9 674 default:
8556edd3 675 return HCI_AT_NO_BONDING;
00ae4af9 676 }
0684e5f9 677 }
8556edd3
JH		 678}
679
680/* Service level security */
d45fc423 681int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 682{
8c1d787b 683 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 684 __u8 auth_type;
685
4343478f 686 auth_type = l2cap_get_auth_type(chan);
79d554a6 687
4343478f 688 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 689}
690
b5ad8b7f 691static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 692{
693 u8 id;
694
695 /* Get next available identificator.
696 * 1 - 128 are used by kernel.
697 * 129 - 199 are reserved.
698 * 200 - 254 are used by utilities like l2ping, etc.
699 */
700
333055f2 701 spin_lock(&conn->lock);
4e8402a3
MH		 702
703 if (++conn->tx_ident > 128)
704 conn->tx_ident = 1;
705
706 id = conn->tx_ident;
707
333055f2 708 spin_unlock(&conn->lock);
4e8402a3
MH		 709
710 return id;
711}
712
4519de9a 713static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 714{
715 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 716 u8 flags;
4e8402a3
MH		 717
718 BT_DBG("code 0x%2.2x", code);
719
720 if (!skb)
9a9c6a34 721 return;
4e8402a3 722
e702112f
AE		 723 if (lmp_no_flush_capable(conn->hcon->hdev))
724 flags = ACL_START_NO_FLUSH;
725 else
726 flags = ACL_START;
727
14b12d0b 728 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 729 skb->priority = HCI_PRIO_MAX;
14b12d0b 730
73d80deb
LAD		 731 hci_send_acl(conn->hchan, skb, flags);
732}
733
734static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
735{
736 struct hci_conn *hcon = chan->conn->hcon;
737 u16 flags;
738
739 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
740 skb->priority);
741
742 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
743 lmp_no_flush_capable(hcon->hdev))
744 flags = ACL_START_NO_FLUSH;
745 else
746 flags = ACL_START;
14b12d0b 747
73d80deb
LAD		 748 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
749 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 750}
751
b76bbd66
MM		 752static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
753{
754 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
755 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
756
757 if (enh & L2CAP_CTRL_FRAME_TYPE) {
758 /* S-Frame */
759 control->sframe = 1;
760 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
761 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
762
763 control->sar = 0;
764 control->txseq = 0;
765 } else {
766 /* I-Frame */
767 control->sframe = 0;
768 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
769 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
770
771 control->poll = 0;
772 control->super = 0;
773 }
774}
775
b76bbd66
MM		 776static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
777{
778 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
779 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
780
781 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
782 /* S-Frame */
783 control->sframe = 1;
784 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
785 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
786
787 control->sar = 0;
788 control->txseq = 0;
789 } else {
790 /* I-Frame */
791 control->sframe = 0;
792 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
793 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
794
795 control->poll = 0;
796 control->super = 0;
797 }
798}
799
800static inline void __unpack_control(struct l2cap_chan *chan,
801 struct sk_buff *skb)
802{
803 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
804 __unpack_extended_control(get_unaligned_le32(skb->data),
805 &bt_cb(skb)->control);
cec8ab6e 806 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 807 } else {
808 __unpack_enhanced_control(get_unaligned_le16(skb->data),
809 &bt_cb(skb)->control);
cec8ab6e 810 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 811 }
812}
813
b5c6aaed
MM		 814static u32 __pack_extended_control(struct l2cap_ctrl *control)
815{
816 u32 packed;
817
818 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
819 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
820
821 if (control->sframe) {
822 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
823 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
824 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
825 } else {
826 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
827 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
828 }
829
830 return packed;
831}
832
833static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
834{
835 u16 packed;
836
837 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
838 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
839
840 if (control->sframe) {
841 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
842 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
843 packed |= L2CAP_CTRL_FRAME_TYPE;
844 } else {
845 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
846 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
847 }
848
849 return packed;
850}
851
b76bbd66
MM		 852static inline void __pack_control(struct l2cap_chan *chan,
853 struct l2cap_ctrl *control,
854 struct sk_buff *skb)
855{
856 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
857 put_unaligned_le32(__pack_extended_control(control),
858 skb->data + L2CAP_HDR_SIZE);
859 } else {
860 put_unaligned_le16(__pack_enhanced_control(control),
861 skb->data + L2CAP_HDR_SIZE);
862 }
863}
864
a67d7f6f
MM		 865static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
866 u32 control)
b5c6aaed
MM		 867{
868 struct sk_buff *skb;
869 struct l2cap_hdr *lh;
a67d7f6f 870 int hlen;
b5c6aaed
MM		 871
872 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
873 hlen = L2CAP_EXT_HDR_SIZE;
874 else
875 hlen = L2CAP_ENH_HDR_SIZE;
876
877 if (chan->fcs == L2CAP_FCS_CRC16)
878 hlen += L2CAP_FCS_SIZE;
879
a67d7f6f 880 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 881
b5c6aaed 882 if (!skb)
a67d7f6f 883 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 884
885 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
886 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
887 lh->cid = cpu_to_le16(chan->dcid);
888
a67d7f6f
MM		 889 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
890 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
891 else
892 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 893
894 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 895 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 896 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
897 }
898
899 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 900 return skb;
901}
902
903static void l2cap_send_sframe(struct l2cap_chan *chan,
904 struct l2cap_ctrl *control)
905{
906 struct sk_buff *skb;
907 u32 control_field;
908
909 BT_DBG("chan %p, control %p", chan, control);
910
911 if (!control->sframe)
912 return;
913
914 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
915 !control->poll)
916 control->final = 1;
917
918 if (control->super == L2CAP_SUPER_RR)
919 clear_bit(CONN_RNR_SENT, &chan->conn_state);
920 else if (control->super == L2CAP_SUPER_RNR)
921 set_bit(CONN_RNR_SENT, &chan->conn_state);
922
923 if (control->super != L2CAP_SUPER_SREJ) {
924 chan->last_acked_seq = control->reqseq;
925 __clear_ack_timer(chan);
926 }
927
928 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
929 control->final, control->poll, control->super);
930
931 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
932 control_field = __pack_extended_control(control);
933 else
934 control_field = __pack_enhanced_control(control);
935
936 skb = l2cap_create_sframe_pdu(chan, control_field);
937 if (!IS_ERR(skb))
938 l2cap_do_send(chan, skb);
b5c6aaed
MM		 939}
940
c9e3d5e0 941static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 942{
c9e3d5e0
MM		 943 struct l2cap_ctrl control;
944
945 BT_DBG("chan %p, poll %d", chan, poll);
946
947 memset(&control, 0, sizeof(control));
948 control.sframe = 1;
949 control.poll = poll;
950
951 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
952 control.super = L2CAP_SUPER_RNR;
953 else
954 control.super = L2CAP_SUPER_RR;
b5c6aaed 955
c9e3d5e0
MM		 956 control.reqseq = chan->buffer_seq;
957 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 958}
959
b4450035 960static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 961{
c1360a1c 962 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 963}
964
9b27f350
AE		 965static void l2cap_send_conn_req(struct l2cap_chan *chan)
966{
967 struct l2cap_conn *conn = chan->conn;
968 struct l2cap_conn_req req;
969
970 req.scid = cpu_to_le16(chan->scid);
971 req.psm = chan->psm;
972
973 chan->ident = l2cap_get_ident(conn);
974
975 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
976
977 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
978}
979
9f0caeb1
VCG		 980static void l2cap_chan_ready(struct l2cap_chan *chan)
981{
982 struct sock *sk = chan->sk;
983 struct sock *parent;
984
985 lock_sock(sk);
986
987 parent = bt_sk(sk)->parent;
988
989 BT_DBG("sk %p, parent %p", sk, parent);
990
2827011f 991 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 992 chan->conf_state = 0;
993 __clear_chan_timer(chan);
994
995 __l2cap_state_change(chan, BT_CONNECTED);
996 sk->sk_state_change(sk);
997
998 if (parent)
999 parent->sk_data_ready(parent, 0);
1000
1001 release_sock(sk);
1002}
1003
fc7f8a7e 1004static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1005{
8c1d787b 1006 struct l2cap_conn *conn = chan->conn;
79d554a6 1007
9f0caeb1
VCG		 1008 if (conn->hcon->type == LE_LINK) {
1009 l2cap_chan_ready(chan);
1010 return;
1011 }
1012
79d554a6 1013 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1014 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1015 return;
1016
d45fc423 1017 if (l2cap_chan_check_security(chan) &&
9b27f350
AE		 1018 __l2cap_no_conn_pending(chan))
1019 l2cap_send_conn_req(chan);
79d554a6
MH		 1020 } else {
1021 struct l2cap_info_req req;
1022 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1023
1024 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1025 conn->info_ident = l2cap_get_ident(conn);
1026
ba13ccd9 1027 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6
MH		 1028
1029 l2cap_send_cmd(conn, conn->info_ident,
1030 L2CAP_INFO_REQ, sizeof(req), &req);
1031 }
1032}
1033
cf6c2c0b
GP		 1034static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1035{
1036 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1037 if (!disable_ertm)
cf6c2c0b
GP		 1038 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1039
1040 switch (mode) {
1041 case L2CAP_MODE_ERTM:
1042 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1043 case L2CAP_MODE_STREAMING:
1044 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1045 default:
1046 return 0x00;
1047 }
1048}
1049
4519de9a 1050static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
22121fc9 1051{
6be36555 1052 struct sock *sk = chan->sk;
22121fc9
GP		 1053 struct l2cap_disconn_req req;
1054
c13ffa62
GP		 1055 if (!conn)
1056 return;
1057
0c1bc5c6 1058 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 1059 __clear_retrans_timer(chan);
1060 __clear_monitor_timer(chan);
1061 __clear_ack_timer(chan);
c13ffa62
GP		 1062 }
1063
fe4128e0
GP		 1064 req.dcid = cpu_to_le16(chan->dcid);
1065 req.scid = cpu_to_le16(chan->scid);
22121fc9
GP		 1066 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1067 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62 1068
6be36555 1069 lock_sock(sk);
0e587be7 1070 __l2cap_state_change(chan, BT_DISCONN);
2e0052e4 1071 __l2cap_chan_set_err(chan, err);
6be36555 1072 release_sock(sk);
22121fc9
GP		 1073}
1074
1da177e4 1075/* ---- L2CAP connections ---- */
4e8402a3
MH		 1076static void l2cap_conn_start(struct l2cap_conn *conn)
1077{
3df91ea2 1078 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1079
1080 BT_DBG("conn %p", conn);
1081
3df91ea2 1082 mutex_lock(&conn->chan_lock);
4e8402a3 1083
3df91ea2 1084 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 1085 struct sock *sk = chan->sk;
baa7e1fa 1086
6be36555 1087 l2cap_chan_lock(chan);
4e8402a3 1088
715ec005 1089 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1090 l2cap_chan_unlock(chan);
79d554a6
MH		 1091 continue;
1092 }
1093
89bc500e 1094 if (chan->state == BT_CONNECT) {
d45fc423 1095 if (!l2cap_chan_check_security(chan) ||
b4450035 1096 !__l2cap_no_conn_pending(chan)) {
6be36555 1097 l2cap_chan_unlock(chan);
47731de7
GP		 1098 continue;
1099 }
79d554a6 1100
c1360a1c
GP		 1101 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1102 && test_bit(CONF_STATE2_DEVICE,
1103 &chan->conf_state)) {
89bc500e 1104 l2cap_chan_close(chan, ECONNRESET);
6be36555 1105 l2cap_chan_unlock(chan);
47731de7 1106 continue;
b1235d79 1107 }
47731de7 1108
9b27f350 1109 l2cap_send_conn_req(chan);
47731de7 1110
89bc500e 1111 } else if (chan->state == BT_CONNECT2) {
79d554a6 1112 struct l2cap_conn_rsp rsp;
e9aeb2dd 1113 char buf[128];
fe4128e0
GP		 1114 rsp.scid = cpu_to_le16(chan->dcid);
1115 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1116
d45fc423 1117 if (l2cap_chan_check_security(chan)) {
6be36555 1118 lock_sock(sk);
c5daa683
GP		 1119 if (test_bit(BT_SK_DEFER_SETUP,
1120 &bt_sk(sk)->flags)) {
f66dc81f
MH		 1121 struct sock *parent = bt_sk(sk)->parent;
1122 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1123 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
05e9a2f6
IK		 1124 if (parent)
1125 parent->sk_data_ready(parent, 0);
f66dc81f
MH		 1126
1127 } else {
0e587be7 1128 __l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 1129 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1130 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1131 }
6be36555 1132 release_sock(sk);
79d554a6
MH		 1133 } else {
1134 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1135 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
1136 }
1137
fc7f8a7e
GP		 1138 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1139 sizeof(rsp), &rsp);
e9aeb2dd 1140
c1360a1c 1141 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
e9aeb2dd 1142 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1143 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1144 continue;
1145 }
1146
c1360a1c 1147 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1148 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 1149 l2cap_build_conf_req(chan, buf), buf);
1150 chan->num_conf_req++;
4e8402a3
MH		 1151 }
1152
6be36555 1153 l2cap_chan_unlock(chan);
4e8402a3
MH		 1154 }
1155
3df91ea2 1156 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1157}
1158
c2287681 1159/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1160 * Returns closest match, locked.
1161 */
d9b88702 1162static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1163 bdaddr_t *src,
1164 bdaddr_t *dst)
b62f328b 1165{
23691d75 1166 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1167
23691d75 1168 read_lock(&chan_list_lock);
b62f328b 1169
23691d75
GP		 1170 list_for_each_entry(c, &chan_list, global_l) {
1171 struct sock *sk = c->sk;
fe4128e0 1172
89bc500e 1173 if (state && c->state != state)
b62f328b
VT		 1174 continue;
1175
23691d75 1176 if (c->scid == cid) {
c2287681
IY		 1177 int src_match, dst_match;
1178 int src_any, dst_any;
1179
b62f328b 1180 /* Exact match. */
c2287681
IY		 1181 src_match = !bacmp(&bt_sk(sk)->src, src);
1182 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1183 if (src_match && dst_match) {
23691d75
GP		 1184 read_unlock(&chan_list_lock);
1185 return c;
1186 }
b62f328b
VT		 1187
1188 /* Closest match */
c2287681
IY		 1189 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1190 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1191 if ((src_match && dst_any) || (src_any && dst_match) ||
1192 (src_any && dst_any))
23691d75 1193 c1 = c;
b62f328b
VT		 1194 }
1195 }
280f294f 1196
23691d75 1197 read_unlock(&chan_list_lock);
b62f328b 1198
23691d75 1199 return c1;
b62f328b
VT		 1200}
1201
1202static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1203{
c916fbe4 1204 struct sock *parent, *sk;
23691d75 1205 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 1206
1207 BT_DBG("");
1208
1209 /* Check if we have socket listening on cid */
23691d75 1210 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
c2287681 1211 conn->src, conn->dst);
23691d75 1212 if (!pchan)
b62f328b
VT		 1213 return;
1214
23691d75
GP		 1215 parent = pchan->sk;
1216
aa2ac881 1217 lock_sock(parent);
62f3a2cf 1218
b62f328b
VT		 1219 /* Check for backlog size */
1220 if (sk_acceptq_is_full(parent)) {
1221 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1222 goto clean;
1223 }
1224
80808e43
GP		 1225 chan = pchan->ops->new_connection(pchan->data);
1226 if (!chan)
b62f328b
VT		 1227 goto clean;
1228
80808e43 1229 sk = chan->sk;
5d41ce1d 1230
b62f328b
VT		 1231 hci_conn_hold(conn->hcon);
1232
b62f328b
VT		 1233 bacpy(&bt_sk(sk)->src, conn->src);
1234 bacpy(&bt_sk(sk)->dst, conn->dst);
1235
d1010240
GP		 1236 bt_accept_enqueue(parent, sk);
1237
3d57dc68 1238 l2cap_chan_add(conn, chan);
48454079 1239
c9b66675 1240 __set_chan_timer(chan, sk->sk_sndtimeo);
b62f328b 1241
0e587be7 1242 __l2cap_state_change(chan, BT_CONNECTED);
b62f328b
VT		 1243 parent->sk_data_ready(parent, 0);
1244
b62f328b 1245clean:
aa2ac881 1246 release_sock(parent);
b62f328b
VT		 1247}
1248
4e8402a3
MH		 1249static void l2cap_conn_ready(struct l2cap_conn *conn)
1250{
48454079 1251 struct l2cap_chan *chan;
4e8402a3 1252
79d554a6 1253 BT_DBG("conn %p", conn);
4e8402a3 1254
b62f328b
VT		 1255 if (!conn->hcon->out && conn->hcon->type == LE_LINK)
1256 l2cap_le_conn_ready(conn);
1257
160dc6ac
VCG		 1258 if (conn->hcon->out && conn->hcon->type == LE_LINK)
1259 smp_conn_security(conn, conn->hcon->pending_sec_level);
1260
3df91ea2 1261 mutex_lock(&conn->chan_lock);
4e8402a3 1262
3df91ea2 1263 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1264
6be36555 1265 l2cap_chan_lock(chan);
4e8402a3 1266
63128451 1267 if (conn->hcon->type == LE_LINK) {
b501d6a1 1268 if (smp_conn_security(conn, chan->sec_level))
cf4cd009 1269 l2cap_chan_ready(chan);
acd7d370 1270
63128451 1271 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1272 struct sock *sk = chan->sk;
c9b66675 1273 __clear_chan_timer(chan);
6be36555 1274 lock_sock(sk);
0e587be7 1275 __l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1276 sk->sk_state_change(sk);
6be36555 1277 release_sock(sk);
b501d6a1 1278
89bc500e 1279 } else if (chan->state == BT_CONNECT)
fc7f8a7e 1280 l2cap_do_start(chan);
4e8402a3 1281
6be36555 1282 l2cap_chan_unlock(chan);
4e8402a3 1283 }
79d554a6 1284
3df91ea2 1285 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1286}
1287
1288/* Notify sockets that we cannot guaranty reliability anymore */
1289static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1290{
48454079 1291 struct l2cap_chan *chan;
4e8402a3
MH		 1292
1293 BT_DBG("conn %p", conn);
1294
3df91ea2 1295 mutex_lock(&conn->chan_lock);
4e8402a3 1296
3df91ea2 1297 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1298 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
2e0052e4 1299 __l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1300 }
1301
3df91ea2 1302 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1303}
1304
f878fcad 1305static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1306{
f878fcad 1307 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
030013d8 1308 info_timer.work);
4e8402a3 1309
984947dc 1310 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1311 conn->info_ident = 0;
984947dc 1312
4e8402a3
MH		 1313 l2cap_conn_start(conn);
1314}
1315
5d3de7df
VCG		 1316static void l2cap_conn_del(struct hci_conn *hcon, int err)
1317{
1318 struct l2cap_conn *conn = hcon->l2cap_data;
1319 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1320
1321 if (!conn)
1322 return;
1323
1324 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1325
1326 kfree_skb(conn->rx_skb);
1327
3df91ea2
AE		 1328 mutex_lock(&conn->chan_lock);
1329
5d3de7df
VCG		 1330 /* Kill channels */
1331 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1332 l2cap_chan_hold(chan);
6be36555
AE		 1333 l2cap_chan_lock(chan);
1334
5d3de7df 1335 l2cap_chan_del(chan, err);
6be36555
AE		 1336
1337 l2cap_chan_unlock(chan);
1338
5d3de7df 1339 chan->ops->close(chan->data);
61d6ef3e 1340 l2cap_chan_put(chan);
5d3de7df
VCG		 1341 }
1342
3df91ea2
AE		 1343 mutex_unlock(&conn->chan_lock);
1344
73d80deb
LAD		 1345 hci_chan_del(conn->hchan);
1346
5d3de7df 1347 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1348 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1349
51a8efd7 1350 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1351 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1352 smp_chan_destroy(conn);
d26a2345 1353 }
5d3de7df
VCG		 1354
1355 hcon->l2cap_data = NULL;
1356 kfree(conn);
1357}
1358
6c9d42a1 1359static void security_timeout(struct work_struct *work)
5d3de7df 1360{
6c9d42a1
GP		 1361 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1362 security_timer.work);
5d3de7df
VCG		 1363
1364 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1365}
1366
1da177e4
LT		 1367static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1368{
0139418c 1369 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1370 struct hci_chan *hchan;
1da177e4 1371
0139418c 1372 if (conn || status)
1da177e4
LT		 1373 return conn;
1374
73d80deb
LAD		 1375 hchan = hci_chan_create(hcon);
1376 if (!hchan)
1377 return NULL;
1378
0139418c 1379 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
73d80deb
LAD		 1380 if (!conn) {
1381 hci_chan_del(hchan);
1da177e4 1382 return NULL;
73d80deb 1383 }
1da177e4
LT		 1384
1385 hcon->l2cap_data = conn;
1386 conn->hcon = hcon;
73d80deb 1387 conn->hchan = hchan;
1da177e4 1388
73d80deb 1389 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1390
acd7d370
VT		 1391 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
1392 conn->mtu = hcon->hdev->le_mtu;
1393 else
1394 conn->mtu = hcon->hdev->acl_mtu;
1395
1da177e4
LT		 1396 conn->src = &hcon->hdev->bdaddr;
1397 conn->dst = &hcon->dst;
1398
4e8402a3
MH		 1399 conn->feat_mask = 0;
1400
1da177e4 1401 spin_lock_init(&conn->lock);
3df91ea2 1402 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1403
1404 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1405
5d3de7df 1406 if (hcon->type == LE_LINK)
6c9d42a1 1407 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1408 else
030013d8 1409 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1410
9f5a0d7b 1411 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1412
1da177e4
LT		 1413 return conn;
1414}
1415
1da177e4 1416/* ---- Socket interface ---- */
1da177e4 1417
c2287681 1418/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1419 * Returns closest match.
1420 */
c2287681
IY		 1421static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1422 bdaddr_t *src,
1423 bdaddr_t *dst)
1da177e4 1424{
23691d75 1425 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1426
23691d75 1427 read_lock(&chan_list_lock);
e0f0cb56 1428
23691d75
GP		 1429 list_for_each_entry(c, &chan_list, global_l) {
1430 struct sock *sk = c->sk;
fe4128e0 1431
89bc500e 1432 if (state && c->state != state)
1da177e4
LT		 1433 continue;
1434
23691d75 1435 if (c->psm == psm) {
c2287681
IY		 1436 int src_match, dst_match;
1437 int src_any, dst_any;
1438
1da177e4 1439 /* Exact match. */
c2287681
IY		 1440 src_match = !bacmp(&bt_sk(sk)->src, src);
1441 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1442 if (src_match && dst_match) {
a7567b20 1443 read_unlock(&chan_list_lock);
23691d75
GP		 1444 return c;
1445 }
1da177e4
LT		 1446
1447 /* Closest match */
c2287681
IY		 1448 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1449 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1450 if ((src_match && dst_any) || (src_any && dst_match) ||
1451 (src_any && dst_any))
23691d75 1452 c1 = c;
1da177e4
LT		 1453 }
1454 }
1da177e4 1455
23691d75 1456 read_unlock(&chan_list_lock);
e0f0cb56 1457
23691d75 1458 return c1;
1da177e4
LT		 1459}
1460
8e9f9892
AG		 1461int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1462 bdaddr_t *dst, u8 dst_type)
1da177e4 1463{
5d41ce1d 1464 struct sock *sk = chan->sk;
1da177e4 1465 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1466 struct l2cap_conn *conn;
1467 struct hci_conn *hcon;
1468 struct hci_dev *hdev;
09ab6f4c 1469 __u8 auth_type;
44d0e48e 1470 int err;
1da177e4 1471
8e9f9892
AG		 1472 BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst),
1473 dst_type, __le16_to_cpu(chan->psm));
1da177e4 1474
af05b30b
GP		 1475 hdev = hci_get_route(dst, src);
1476 if (!hdev)
1da177e4
LT		 1477 return -EHOSTUNREACH;
1478
09fd0de5 1479 hci_dev_lock(hdev);
1da177e4 1480
6be36555 1481 l2cap_chan_lock(chan);
03a00194
GP		 1482
1483 /* PSM must be odd and lsb of upper byte must be 0 */
1484 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1485 chan->chan_type != L2CAP_CHAN_RAW) {
1486 err = -EINVAL;
1487 goto done;
1488 }
1489
1490 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1491 err = -EINVAL;
1492 goto done;
1493 }
1494
1495 switch (chan->mode) {
1496 case L2CAP_MODE_BASIC:
1497 break;
1498 case L2CAP_MODE_ERTM:
1499 case L2CAP_MODE_STREAMING:
1500 if (!disable_ertm)
1501 break;
1502 /* fall through */
1503 default:
1504 err = -ENOTSUPP;
1505 goto done;
1506 }
1507
6be36555
AE		 1508 lock_sock(sk);
1509
03a00194
GP		 1510 switch (sk->sk_state) {
1511 case BT_CONNECT:
1512 case BT_CONNECT2:
1513 case BT_CONFIG:
1514 /* Already connecting */
1515 err = 0;
6be36555 1516 release_sock(sk);
03a00194
GP		 1517 goto done;
1518
1519 case BT_CONNECTED:
1520 /* Already connected */
1521 err = -EISCONN;
6be36555 1522 release_sock(sk);
03a00194
GP		 1523 goto done;
1524
1525 case BT_OPEN:
1526 case BT_BOUND:
1527 /* Can connect */
1528 break;
1529
1530 default:
1531 err = -EBADFD;
6be36555 1532 release_sock(sk);
03a00194
GP		 1533 goto done;
1534 }
1535
1536 /* Set destination address and psm */
9219b2a0 1537 bacpy(&bt_sk(sk)->dst, dst);
6be36555
AE		 1538
1539 release_sock(sk);
1540
03a00194
GP		 1541 chan->psm = psm;
1542 chan->dcid = cid;
1da177e4 1543
4343478f 1544 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1545
fe4128e0 1546 if (chan->dcid == L2CAP_CID_LE_DATA)
8e9f9892 1547 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1548 chan->sec_level, auth_type);
acd7d370 1549 else
8e9f9892 1550 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1551 chan->sec_level, auth_type);
acd7d370 1552
30e76272
VT		 1553 if (IS_ERR(hcon)) {
1554 err = PTR_ERR(hcon);
1da177e4 1555 goto done;
30e76272 1556 }
1da177e4
LT		 1557
1558 conn = l2cap_conn_add(hcon, 0);
1559 if (!conn) {
1560 hci_conn_put(hcon);
30e76272 1561 err = -ENOMEM;
1da177e4
LT		 1562 goto done;
1563 }
1564
9f0caeb1
VCG		 1565 if (hcon->type == LE_LINK) {
1566 err = 0;
1567
1568 if (!list_empty(&conn->chan_l)) {
1569 err = -EBUSY;
1570 hci_conn_put(hcon);
1571 }
1572
1573 if (err)
1574 goto done;
1575 }
1576
1da177e4
LT		 1577 /* Update source addr of the socket */
1578 bacpy(src, conn->src);
1579
6be36555 1580 l2cap_chan_unlock(chan);
48454079 1581 l2cap_chan_add(conn, chan);
6be36555 1582 l2cap_chan_lock(chan);
48454079 1583
6be36555 1584 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1585 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1586
1587 if (hcon->state == BT_CONNECTED) {
715ec005 1588 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1589 __clear_chan_timer(chan);
d45fc423 1590 if (l2cap_chan_check_security(chan))
6be36555 1591 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1592 } else
fc7f8a7e 1593 l2cap_do_start(chan);
1da177e4
LT		 1594 }
1595
30e76272
VT		 1596 err = 0;
1597
1da177e4 1598done:
6be36555 1599 l2cap_chan_unlock(chan);
09fd0de5 1600 hci_dev_unlock(hdev);
1da177e4
LT		 1601 hci_dev_put(hdev);
1602 return err;
1603}
1604
dcba0dba 1605int __l2cap_wait_ack(struct sock *sk)
6161c038 1606{
8c1d787b 1607 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1608 DECLARE_WAITQUEUE(wait, current);
1609 int err = 0;
1610 int timeo = HZ/5;
1611
2b0b05dd 1612 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1613 set_current_state(TASK_INTERRUPTIBLE);
1614 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1615 if (!timeo)
1616 timeo = HZ/5;
1617
1618 if (signal_pending(current)) {
1619 err = sock_intr_errno(timeo);
1620 break;
1621 }
1622
1623 release_sock(sk);
1624 timeo = schedule_timeout(timeo);
1625 lock_sock(sk);
a71a0cf4 1626 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1627
1628 err = sock_error(sk);
1629 if (err)
1630 break;
1631 }
1632 set_current_state(TASK_RUNNING);
2b0b05dd 1633 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1634 return err;
1635}
1636
721c4181 1637static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1638{
721c4181 1639 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1640 monitor_timer.work);
e90bac06 1641
525cd185 1642 BT_DBG("chan %p", chan);
0e98958d 1643
6be36555
AE		 1644 l2cap_chan_lock(chan);
1645
80909e04 1646 if (!chan->conn) {
6be36555 1647 l2cap_chan_unlock(chan);
8d7e1c7f 1648 l2cap_chan_put(chan);
e90bac06
GP		 1649 return;
1650 }
1651
80909e04 1652 l2cap_tx(chan, 0, 0, L2CAP_EV_MONITOR_TO);
e90bac06 1653
6be36555 1654 l2cap_chan_unlock(chan);
8d7e1c7f 1655 l2cap_chan_put(chan);
e90bac06
GP		 1656}
1657
721c4181 1658static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1659{
721c4181 1660 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1661 retrans_timer.work);
e90bac06 1662
49208c9c 1663 BT_DBG("chan %p", chan);
0e98958d 1664
6be36555
AE		 1665 l2cap_chan_lock(chan);
1666
80909e04
MM		 1667 if (!chan->conn) {
1668 l2cap_chan_unlock(chan);
1669 l2cap_chan_put(chan);
1670 return;
1671 }
6be36555 1672
80909e04 1673 l2cap_tx(chan, 0, 0, L2CAP_EV_RETRANS_TO);
6be36555 1674 l2cap_chan_unlock(chan);
8d7e1c7f 1675 l2cap_chan_put(chan);
e90bac06
GP		 1676}
1677
3733937d
MM		 1678static int l2cap_streaming_send(struct l2cap_chan *chan,
1679 struct sk_buff_head *skbs)
6840ed07 1680{
ccbb84af 1681 struct sk_buff *skb;
3733937d 1682 struct l2cap_ctrl *control;
6840ed07 1683
3733937d
MM		 1684 BT_DBG("chan %p, skbs %p", chan, skbs);
1685
1686 if (chan->state != BT_CONNECTED)
1687 return -ENOTCONN;
1688
1689 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1690
1691 while (!skb_queue_empty(&chan->tx_q)) {
1692
1693 skb = skb_dequeue(&chan->tx_q);
1694
1695 bt_cb(skb)->control.retries = 1;
1696 control = &bt_cb(skb)->control;
1697
1698 control->reqseq = 0;
1699 control->txseq = chan->next_tx_seq;
1700
1701 __pack_control(chan, control, skb);
6840ed07 1702
47d1ec61 1703 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1704 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1705 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1706 }
1707
4343478f 1708 l2cap_do_send(chan, skb);
6840ed07 1709
3733937d
MM		 1710 BT_DBG("Sent txseq %d", (int)control->txseq);
1711
836be934 1712 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1713 chan->frames_sent++;
6840ed07 1714 }
3733937d
MM		 1715
1716 return 0;
6840ed07
GP		 1717}
1718
67c9e840 1719static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1720{
1721 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1722 struct l2cap_ctrl *control;
1723 int sent = 0;
1724
1725 BT_DBG("chan %p", chan);
1c2acffb 1726
89bc500e 1727 if (chan->state != BT_CONNECTED)
c13ffa62 1728 return -ENOTCONN;
e90bac06 1729
94122bbe
MM		 1730 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1731 return 0;
1732
18a48e76
MM		 1733 while (chan->tx_send_head &&
1734 chan->unacked_frames < chan->remote_tx_win &&
1735 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1736
18a48e76 1737 skb = chan->tx_send_head;
e90bac06 1738
18a48e76
MM		 1739 bt_cb(skb)->control.retries = 1;
1740 control = &bt_cb(skb)->control;
95ffa978 1741
e2ab4353 1742 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1743 control->final = 1;
e2ab4353 1744
18a48e76
MM		 1745 control->reqseq = chan->buffer_seq;
1746 chan->last_acked_seq = chan->buffer_seq;
1747 control->txseq = chan->next_tx_seq;
1c2acffb 1748
18a48e76 1749 __pack_control(chan, control, skb);
e90bac06 1750
47d1ec61 1751 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1752 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1753 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1754 }
1755
18a48e76
MM		 1756 /* Clone after data has been modified. Data is assumed to be
1757 read-only (for locking purposes) on cloned sk_buffs.
1758 */
1759 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1760
18a48e76
MM		 1761 if (!tx_skb)
1762 break;
1c2acffb 1763
18a48e76 1764 __set_retrans_timer(chan);
836be934
AE		 1765
1766 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1767 chan->unacked_frames++;
6a026610 1768 chan->frames_sent++;
18a48e76 1769 sent++;
1c2acffb 1770
58d35f87
GP		 1771 if (skb_queue_is_last(&chan->tx_q, skb))
1772 chan->tx_send_head = NULL;
1c2acffb 1773 else
58d35f87 1774 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1775
1776 l2cap_do_send(chan, tx_skb);
1777 BT_DBG("Sent txseq %d", (int)control->txseq);
1c2acffb
GP		 1778 }
1779
18a48e76
MM		 1780 BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent,
1781 (int) chan->unacked_frames, skb_queue_len(&chan->tx_q));
1782
1783 return sent;
9e917af1
GP		 1784}
1785
e1fbd4c1
MM		 1786static void l2cap_ertm_resend(struct l2cap_chan *chan)
1787{
1788 struct l2cap_ctrl control;
1789 struct sk_buff *skb;
1790 struct sk_buff *tx_skb;
1791 u16 seq;
1792
1793 BT_DBG("chan %p", chan);
1794
1795 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1796 return;
1797
1798 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1799 seq = l2cap_seq_list_pop(&chan->retrans_list);
1800
1801 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1802 if (!skb) {
1803 BT_DBG("Error: Can't retransmit seq %d, frame missing",
1804 seq);
1805 continue;
1806 }
1807
1808 bt_cb(skb)->control.retries++;
1809 control = bt_cb(skb)->control;
1810
1811 if (chan->max_tx != 0 &&
1812 bt_cb(skb)->control.retries > chan->max_tx) {
1813 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
1814 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
1815 l2cap_seq_list_clear(&chan->retrans_list);
1816 break;
1817 }
1818
1819 control.reqseq = chan->buffer_seq;
1820 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1821 control.final = 1;
1822 else
1823 control.final = 0;
1824
1825 if (skb_cloned(skb)) {
1826 /* Cloned sk_buffs are read-only, so we need a
1827 * writeable copy
1828 */
1829 tx_skb = skb_copy(skb, GFP_ATOMIC);
1830 } else {
1831 tx_skb = skb_clone(skb, GFP_ATOMIC);
1832 }
1833
1834 if (!tx_skb) {
1835 l2cap_seq_list_clear(&chan->retrans_list);
1836 break;
1837 }
1838
1839 /* Update skb contents */
1840 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1841 put_unaligned_le32(__pack_extended_control(&control),
1842 tx_skb->data + L2CAP_HDR_SIZE);
1843 } else {
1844 put_unaligned_le16(__pack_enhanced_control(&control),
1845 tx_skb->data + L2CAP_HDR_SIZE);
1846 }
1847
1848 if (chan->fcs == L2CAP_FCS_CRC16) {
1849 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
1850 put_unaligned_le16(fcs, skb_put(tx_skb,
1851 L2CAP_FCS_SIZE));
1852 }
1853
1854 l2cap_do_send(chan, tx_skb);
1855
1856 BT_DBG("Resent txseq %d", control.txseq);
1857
1858 chan->last_acked_seq = chan->buffer_seq;
1859 }
1860}
1861
f80842a8
MM		 1862static void l2cap_retransmit(struct l2cap_chan *chan,
1863 struct l2cap_ctrl *control)
1864{
1865 BT_DBG("chan %p, control %p", chan, control);
1866
1867 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
1868 l2cap_ertm_resend(chan);
1869}
1870
d2a7ac5d
MM		 1871static void l2cap_retransmit_all(struct l2cap_chan *chan,
1872 struct l2cap_ctrl *control)
1873{
e1fbd4c1
MM		 1874 struct sk_buff *skb;
1875
1876 BT_DBG("chan %p, control %p", chan, control);
1877
1878 if (control->poll)
1879 set_bit(CONN_SEND_FBIT, &chan->conn_state);
1880
1881 l2cap_seq_list_clear(&chan->retrans_list);
1882
1883 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1884 return;
1885
1886 if (chan->unacked_frames) {
1887 skb_queue_walk(&chan->tx_q, skb) {
1888 if (bt_cb(skb)->control.txseq == control->reqseq ||
1889 skb == chan->tx_send_head)
1890 break;
1891 }
1892
1893 skb_queue_walk_from(&chan->tx_q, skb) {
1894 if (skb == chan->tx_send_head)
1895 break;
1896
1897 l2cap_seq_list_append(&chan->retrans_list,
1898 bt_cb(skb)->control.txseq);
1899 }
1900
1901 l2cap_ertm_resend(chan);
1902 }
d2a7ac5d
MM		 1903}
1904
0a0aba42 1905static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 1906{
0a0aba42
MM		 1907 struct l2cap_ctrl control;
1908 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
1909 chan->last_acked_seq);
1910 int threshold;
9e917af1 1911
0a0aba42
MM		 1912 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
1913 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 1914
0a0aba42
MM		 1915 memset(&control, 0, sizeof(control));
1916 control.sframe = 1;
dfc909be 1917
0a0aba42
MM		 1918 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
1919 chan->rx_state == L2CAP_RX_STATE_RECV) {
1920 __clear_ack_timer(chan);
1921 control.super = L2CAP_SUPER_RNR;
1922 control.reqseq = chan->buffer_seq;
1923 l2cap_send_sframe(chan, &control);
1924 } else {
1925 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
1926 l2cap_ertm_send(chan);
1927 /* If any i-frames were sent, they included an ack */
1928 if (chan->buffer_seq == chan->last_acked_seq)
1929 frames_to_ack = 0;
1930 }
dfc909be 1931
0a0aba42
MM		 1932 /* Ack now if the tx window is 3/4ths full.
1933 * Calculate without mul or div
1934 */
1935 threshold = chan->tx_win;
1936 threshold += threshold << 1;
1937 threshold >>= 2;
1938
1939 BT_DBG("frames_to_ack %d, threshold %d", (int)frames_to_ack,
1940 threshold);
1941
1942 if (frames_to_ack >= threshold) {
1943 __clear_ack_timer(chan);
1944 control.super = L2CAP_SUPER_RR;
1945 control.reqseq = chan->buffer_seq;
1946 l2cap_send_sframe(chan, &control);
1947 frames_to_ack = 0;
1948 }
1c2acffb 1949
0a0aba42
MM		 1950 if (frames_to_ack)
1951 __set_ack_timer(chan);
1952 }
b17e73bb
SJ		 1953}
1954
04124681
GP		 1955static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
1956 struct msghdr *msg, int len,
1957 int count, struct sk_buff *skb)
1c2acffb 1958{
0952a57a 1959 struct l2cap_conn *conn = chan->conn;
1c2acffb 1960 struct sk_buff **frag;
90338947 1961 int sent = 0;
1da177e4 1962
59203a21 1963 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1964 return -EFAULT;
1da177e4
LT		 1965
1966 sent += count;
1967 len -= count;
1968
1969 /* Continuation fragments (no L2CAP header) */
1970 frag = &skb_shinfo(skb)->frag_list;
1971 while (len) {
fbe00700
GP		 1972 struct sk_buff *tmp;
1973
1da177e4
LT		 1974 count = min_t(unsigned int, conn->mtu, len);
1975
fbe00700
GP		 1976 tmp = chan->ops->alloc_skb(chan, count,
1977 msg->msg_flags & MSG_DONTWAIT);
1978 if (IS_ERR(tmp))
1979 return PTR_ERR(tmp);
1980
1981 *frag = tmp;
2f7719ce 1982
1c2acffb
GP		 1983 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1984 return -EFAULT;
1da177e4 1985
5e59b791
LAD		 1986 (*frag)->priority = skb->priority;
1987
1da177e4
LT		 1988 sent += count;
1989 len -= count;
1990
2d0ed3d5
GP		 1991 skb->len += (*frag)->len;
1992 skb->data_len += (*frag)->len;
1993
1da177e4
LT		 1994 frag = &(*frag)->next;
1995 }
1da177e4
LT		 1996
1997 return sent;
1c2acffb 1998}
1da177e4 1999
5e59b791
LAD		 2000static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
2001 struct msghdr *msg, size_t len,
2002 u32 priority)
1c2acffb 2003{
8c1d787b 2004 struct l2cap_conn *conn = chan->conn;
1c2acffb 2005 struct sk_buff *skb;
03a51213 2006 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2007 struct l2cap_hdr *lh;
2008
6d5922b0 2009 BT_DBG("chan %p len %d priority %u", chan, (int)len, priority);
1c2acffb
GP		 2010
2011 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2012
2013 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2014 msg->msg_flags & MSG_DONTWAIT);
2015 if (IS_ERR(skb))
2016 return skb;
1c2acffb 2017
5e59b791
LAD		 2018 skb->priority = priority;
2019
1c2acffb
GP		 2020 /* Create L2CAP header */
2021 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2022 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c
AE		 2023 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2024 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2025
0952a57a 2026 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2027 if (unlikely(err < 0)) {
2028 kfree_skb(skb);
2029 return ERR_PTR(err);
2030 }
2031 return skb;
2032}
2033
5e59b791
LAD		 2034static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
2035 struct msghdr *msg, size_t len,
2036 u32 priority)
1c2acffb 2037{
8c1d787b 2038 struct l2cap_conn *conn = chan->conn;
1c2acffb 2039 struct sk_buff *skb;
f2ba7fae 2040 int err, count;
1c2acffb
GP		 2041 struct l2cap_hdr *lh;
2042
6d5922b0 2043 BT_DBG("chan %p len %d", chan, (int)len);
1c2acffb 2044
f2ba7fae 2045 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2046
f2ba7fae 2047 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2048 msg->msg_flags & MSG_DONTWAIT);
2049 if (IS_ERR(skb))
2050 return skb;
1c2acffb 2051
5e59b791
LAD		 2052 skb->priority = priority;
2053
1c2acffb
GP		 2054 /* Create L2CAP header */
2055 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2056 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2057 lh->len = cpu_to_le16(len);
1c2acffb 2058
0952a57a 2059 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2060 if (unlikely(err < 0)) {
2061 kfree_skb(skb);
2062 return ERR_PTR(err);
2063 }
2064 return skb;
2065}
2066
ab0ff76d
LAD		 2067static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
2068 struct msghdr *msg, size_t len,
94122bbe 2069 u16 sdulen)
1c2acffb 2070{
8c1d787b 2071 struct l2cap_conn *conn = chan->conn;
1c2acffb 2072 struct sk_buff *skb;
e4ca6d98 2073 int err, count, hlen;
1c2acffb
GP		 2074 struct l2cap_hdr *lh;
2075
6d5922b0 2076 BT_DBG("chan %p len %d", chan, (int)len);
1c2acffb 2077
0ee0d208
GP		 2078 if (!conn)
2079 return ERR_PTR(-ENOTCONN);
2080
e4ca6d98
AE		 2081 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2082 hlen = L2CAP_EXT_HDR_SIZE;
2083 else
2084 hlen = L2CAP_ENH_HDR_SIZE;
2085
c74e560c 2086 if (sdulen)
03a51213 2087 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2088
47d1ec61 2089 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2090 hlen += L2CAP_FCS_SIZE;
fcc203c3 2091
1c2acffb 2092 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2093
2094 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2095 msg->msg_flags & MSG_DONTWAIT);
2096 if (IS_ERR(skb))
2097 return skb;
1c2acffb
GP		 2098
2099 /* Create L2CAP header */
2100 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2101 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2102 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2103
18a48e76
MM		 2104 /* Control header is populated later */
2105 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2106 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2107 else
2108 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2109
c74e560c 2110 if (sdulen)
03a51213 2111 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2112
0952a57a 2113 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2114 if (unlikely(err < 0)) {
2115 kfree_skb(skb);
2116 return ERR_PTR(err);
2117 }
e90bac06 2118
18a48e76 2119 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2120 bt_cb(skb)->control.retries = 0;
1c2acffb 2121 return skb;
1da177e4
LT		 2122}
2123
94122bbe
MM		 2124static int l2cap_segment_sdu(struct l2cap_chan *chan,
2125 struct sk_buff_head *seg_queue,
2126 struct msghdr *msg, size_t len)
c74e560c 2127{
c74e560c 2128 struct sk_buff *skb;
94122bbe
MM		 2129 u16 sdu_len;
2130 size_t pdu_len;
2131 int err = 0;
2132 u8 sar;
c74e560c 2133
94122bbe 2134 BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len);
c74e560c 2135
94122bbe
MM		 2136 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2137 * so fragmented skbs are not used. The HCI layer's handling
2138 * of fragmented skbs is not compatible with ERTM's queueing.
2139 */
c74e560c 2140
94122bbe
MM		 2141 /* PDU size is derived from the HCI MTU */
2142 pdu_len = chan->conn->mtu;
c74e560c 2143
94122bbe
MM		 2144 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2145
2146 /* Adjust for largest possible L2CAP overhead. */
2147 pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE;
2148
2149 /* Remote device may have requested smaller PDUs */
2150 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2151
2152 if (len <= pdu_len) {
2153 sar = L2CAP_SAR_UNSEGMENTED;
2154 sdu_len = 0;
2155 pdu_len = len;
2156 } else {
2157 sar = L2CAP_SAR_START;
2158 sdu_len = len;
2159 pdu_len -= L2CAP_SDULEN_SIZE;
2160 }
2161
2162 while (len > 0) {
2163 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2164
c74e560c 2165 if (IS_ERR(skb)) {
94122bbe 2166 __skb_queue_purge(seg_queue);
c74e560c
GP		 2167 return PTR_ERR(skb);
2168 }
2169
94122bbe
MM		 2170 bt_cb(skb)->control.sar = sar;
2171 __skb_queue_tail(seg_queue, skb);
2172
2173 len -= pdu_len;
2174 if (sdu_len) {
2175 sdu_len = 0;
2176 pdu_len += L2CAP_SDULEN_SIZE;
2177 }
2178
2179 if (len <= pdu_len) {
2180 sar = L2CAP_SAR_END;
2181 pdu_len = len;
2182 } else {
2183 sar = L2CAP_SAR_CONTINUE;
2184 }
c74e560c 2185 }
c74e560c 2186
94122bbe 2187 return err;
c74e560c
GP		 2188}
2189
5e59b791
LAD		 2190int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2191 u32 priority)
9a91a04a 2192{
9a91a04a 2193 struct sk_buff *skb;
9a91a04a 2194 int err;
94122bbe 2195 struct sk_buff_head seg_queue;
9a91a04a
GP		 2196
2197 /* Connectionless channel */
715ec005 2198 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2199 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2200 if (IS_ERR(skb))
2201 return PTR_ERR(skb);
2202
2203 l2cap_do_send(chan, skb);
2204 return len;
2205 }
2206
2207 switch (chan->mode) {
2208 case L2CAP_MODE_BASIC:
2209 /* Check outgoing MTU */
2210 if (len > chan->omtu)
2211 return -EMSGSIZE;
2212
2213 /* Create a basic PDU */
5e59b791 2214 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2215 if (IS_ERR(skb))
2216 return PTR_ERR(skb);
2217
2218 l2cap_do_send(chan, skb);
2219 err = len;
2220 break;
2221
2222 case L2CAP_MODE_ERTM:
2223 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2224 /* Check outgoing MTU */
2225 if (len > chan->omtu) {
2226 err = -EMSGSIZE;
2227 break;
2228 }
9a91a04a 2229
94122bbe 2230 __skb_queue_head_init(&seg_queue);
9a91a04a 2231
94122bbe
MM		 2232 /* Do segmentation before calling in to the state machine,
2233 * since it's possible to block while waiting for memory
2234 * allocation.
2235 */
2236 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2237
94122bbe
MM		 2238 /* The channel could have been closed while segmenting,
2239 * check that it is still connected.
2240 */
2241 if (chan->state != BT_CONNECTED) {
2242 __skb_queue_purge(&seg_queue);
2243 err = -ENOTCONN;
9a91a04a
GP		 2244 }
2245
94122bbe 2246 if (err)
9a91a04a 2247 break;
9a91a04a 2248
3733937d 2249 if (chan->mode == L2CAP_MODE_ERTM)
608bcc6d
MM		 2250 err = l2cap_tx(chan, 0, &seg_queue,
2251 L2CAP_EV_DATA_REQUEST);
3733937d
MM		 2252 else
2253 err = l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2254
608bcc6d 2255 if (!err)
9a91a04a
GP		 2256 err = len;
2257
94122bbe
MM		 2258 /* If the skbs were not queued for sending, they'll still be in
2259 * seg_queue and need to be purged.
2260 */
2261 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2262 break;
2263
2264 default:
2265 BT_DBG("bad state %1.1x", chan->mode);
2266 err = -EBADFD;
2267 }
2268
2269 return err;
2270}
2271
d2a7ac5d
MM		 2272static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2273{
bed68bde
MM		 2274 struct l2cap_ctrl control;
2275 u16 seq;
2276
2277 BT_DBG("chan %p, txseq %d", chan, txseq);
2278
2279 memset(&control, 0, sizeof(control));
2280 control.sframe = 1;
2281 control.super = L2CAP_SUPER_SREJ;
2282
2283 for (seq = chan->expected_tx_seq; seq != txseq;
2284 seq = __next_seq(chan, seq)) {
2285 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2286 control.reqseq = seq;
2287 l2cap_send_sframe(chan, &control);
2288 l2cap_seq_list_append(&chan->srej_list, seq);
2289 }
2290 }
2291
2292 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2293}
2294
2295static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2296{
bed68bde
MM		 2297 struct l2cap_ctrl control;
2298
2299 BT_DBG("chan %p", chan);
2300
2301 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2302 return;
2303
2304 memset(&control, 0, sizeof(control));
2305 control.sframe = 1;
2306 control.super = L2CAP_SUPER_SREJ;
2307 control.reqseq = chan->srej_list.tail;
2308 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2309}
2310
2311static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2312{
bed68bde
MM		 2313 struct l2cap_ctrl control;
2314 u16 initial_head;
2315 u16 seq;
2316
2317 BT_DBG("chan %p, txseq %d", chan, txseq);
2318
2319 memset(&control, 0, sizeof(control));
2320 control.sframe = 1;
2321 control.super = L2CAP_SUPER_SREJ;
2322
2323 /* Capture initial list head to allow only one pass through the list. */
2324 initial_head = chan->srej_list.head;
2325
2326 do {
2327 seq = l2cap_seq_list_pop(&chan->srej_list);
2328 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2329 break;
2330
2331 control.reqseq = seq;
2332 l2cap_send_sframe(chan, &control);
2333 l2cap_seq_list_append(&chan->srej_list, seq);
2334 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2335}
2336
608bcc6d
MM		 2337static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2338{
2339 struct sk_buff *acked_skb;
2340 u16 ackseq;
2341
2342 BT_DBG("chan %p, reqseq %d", chan, reqseq);
2343
2344 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2345 return;
2346
2347 BT_DBG("expected_ack_seq %d, unacked_frames %d",
2348 chan->expected_ack_seq, chan->unacked_frames);
2349
2350 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2351 ackseq = __next_seq(chan, ackseq)) {
2352
2353 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2354 if (acked_skb) {
2355 skb_unlink(acked_skb, &chan->tx_q);
2356 kfree_skb(acked_skb);
2357 chan->unacked_frames--;
2358 }
2359 }
2360
2361 chan->expected_ack_seq = reqseq;
2362
2363 if (chan->unacked_frames == 0)
2364 __clear_retrans_timer(chan);
2365
2366 BT_DBG("unacked_frames %d", (int) chan->unacked_frames);
2367}
2368
2369static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2370{
2371 BT_DBG("chan %p", chan);
2372
2373 chan->expected_tx_seq = chan->buffer_seq;
2374 l2cap_seq_list_clear(&chan->srej_list);
2375 skb_queue_purge(&chan->srej_q);
2376 chan->rx_state = L2CAP_RX_STATE_RECV;
2377}
2378
2379static int l2cap_tx_state_xmit(struct l2cap_chan *chan,
2380 struct l2cap_ctrl *control,
2381 struct sk_buff_head *skbs, u8 event)
2382{
2383 int err = 0;
2384
2385 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2386 event);
2387
2388 switch (event) {
2389 case L2CAP_EV_DATA_REQUEST:
2390 if (chan->tx_send_head == NULL)
2391 chan->tx_send_head = skb_peek(skbs);
2392
2393 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2394 l2cap_ertm_send(chan);
2395 break;
2396 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2397 BT_DBG("Enter LOCAL_BUSY");
2398 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2399
2400 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2401 /* The SREJ_SENT state must be aborted if we are to
2402 * enter the LOCAL_BUSY state.
2403 */
2404 l2cap_abort_rx_srej_sent(chan);
2405 }
2406
2407 l2cap_send_ack(chan);
2408
2409 break;
2410 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2411 BT_DBG("Exit LOCAL_BUSY");
2412 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2413
2414 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2415 struct l2cap_ctrl local_control;
2416
2417 memset(&local_control, 0, sizeof(local_control));
2418 local_control.sframe = 1;
2419 local_control.super = L2CAP_SUPER_RR;
2420 local_control.poll = 1;
2421 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2422 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2423
2424 chan->retry_count = 1;
2425 __set_monitor_timer(chan);
2426 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2427 }
2428 break;
2429 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2430 l2cap_process_reqseq(chan, control->reqseq);
2431 break;
2432 case L2CAP_EV_EXPLICIT_POLL:
2433 l2cap_send_rr_or_rnr(chan, 1);
2434 chan->retry_count = 1;
2435 __set_monitor_timer(chan);
2436 __clear_ack_timer(chan);
2437 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2438 break;
2439 case L2CAP_EV_RETRANS_TO:
2440 l2cap_send_rr_or_rnr(chan, 1);
2441 chan->retry_count = 1;
2442 __set_monitor_timer(chan);
2443 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2444 break;
2445 case L2CAP_EV_RECV_FBIT:
2446 /* Nothing to process */
2447 break;
2448 default:
2449 break;
2450 }
2451
2452 return err;
2453}
2454
2455static int l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2456 struct l2cap_ctrl *control,
2457 struct sk_buff_head *skbs, u8 event)
2458{
2459 int err = 0;
2460
2461 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2462 event);
2463
2464 switch (event) {
2465 case L2CAP_EV_DATA_REQUEST:
2466 if (chan->tx_send_head == NULL)
2467 chan->tx_send_head = skb_peek(skbs);
2468 /* Queue data, but don't send. */
2469 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2470 break;
2471 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2472 BT_DBG("Enter LOCAL_BUSY");
2473 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2474
2475 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2476 /* The SREJ_SENT state must be aborted if we are to
2477 * enter the LOCAL_BUSY state.
2478 */
2479 l2cap_abort_rx_srej_sent(chan);
2480 }
2481
2482 l2cap_send_ack(chan);
2483
2484 break;
2485 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2486 BT_DBG("Exit LOCAL_BUSY");
2487 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2488
2489 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2490 struct l2cap_ctrl local_control;
2491 memset(&local_control, 0, sizeof(local_control));
2492 local_control.sframe = 1;
2493 local_control.super = L2CAP_SUPER_RR;
2494 local_control.poll = 1;
2495 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2496 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2497
2498 chan->retry_count = 1;
2499 __set_monitor_timer(chan);
2500 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2501 }
2502 break;
2503 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2504 l2cap_process_reqseq(chan, control->reqseq);
2505
2506 /* Fall through */
2507
2508 case L2CAP_EV_RECV_FBIT:
2509 if (control && control->final) {
2510 __clear_monitor_timer(chan);
2511 if (chan->unacked_frames > 0)
2512 __set_retrans_timer(chan);
2513 chan->retry_count = 0;
2514 chan->tx_state = L2CAP_TX_STATE_XMIT;
2515 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2516 }
2517 break;
2518 case L2CAP_EV_EXPLICIT_POLL:
2519 /* Ignore */
2520 break;
2521 case L2CAP_EV_MONITOR_TO:
2522 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2523 l2cap_send_rr_or_rnr(chan, 1);
2524 __set_monitor_timer(chan);
2525 chan->retry_count++;
2526 } else {
2527 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
2528 }
2529 break;
2530 default:
2531 break;
2532 }
2533
2534 return err;
2535}
2536
2537static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2538 struct sk_buff_head *skbs, u8 event)
2539{
2540 int err = 0;
2541
2542 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2543 chan, control, skbs, event, chan->tx_state);
2544
2545 switch (chan->tx_state) {
2546 case L2CAP_TX_STATE_XMIT:
2547 err = l2cap_tx_state_xmit(chan, control, skbs, event);
2548 break;
2549 case L2CAP_TX_STATE_WAIT_F:
2550 err = l2cap_tx_state_wait_f(chan, control, skbs, event);
2551 break;
2552 default:
2553 /* Ignore event */
2554 break;
2555 }
2556
2557 return err;
2558}
2559
4b51dae9
MM		 2560static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2561 struct l2cap_ctrl *control)
2562{
2563 BT_DBG("chan %p, control %p", chan, control);
2564 l2cap_tx(chan, control, 0, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
2565}
2566
f80842a8
MM		 2567static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2568 struct l2cap_ctrl *control)
2569{
2570 BT_DBG("chan %p, control %p", chan, control);
2571 l2cap_tx(chan, control, 0, L2CAP_EV_RECV_FBIT);
2572}
2573
1da177e4
LT		 2574/* Copy frame to all raw sockets on that connection */
2575static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2576{
1da177e4 2577 struct sk_buff *nskb;
48454079 2578 struct l2cap_chan *chan;
1da177e4
LT		 2579
2580 BT_DBG("conn %p", conn);
2581
3df91ea2 2582 mutex_lock(&conn->chan_lock);
3d57dc68 2583
3df91ea2 2584 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2585 struct sock *sk = chan->sk;
715ec005 2586 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2587 continue;
2588
2589 /* Don't send frame to the socket it came from */
2590 if (skb->sk == sk)
2591 continue;
af05b30b
GP		 2592 nskb = skb_clone(skb, GFP_ATOMIC);
2593 if (!nskb)
1da177e4
LT		 2594 continue;
2595
23070494 2596 if (chan->ops->recv(chan->data, nskb))
1da177e4
LT		 2597 kfree_skb(nskb);
2598 }
3d57dc68 2599
3df91ea2 2600 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2601}
2602
2603/* ---- L2CAP signalling commands ---- */
2604static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2605 u8 code, u8 ident, u16 dlen, void *data)
2606{
2607 struct sk_buff *skb, **frag;
2608 struct l2cap_cmd_hdr *cmd;
2609 struct l2cap_hdr *lh;
2610 int len, count;
2611
af05b30b
GP		 2612 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2613 conn, code, ident, dlen);
1da177e4
LT		 2614
2615 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2616 count = min_t(unsigned int, conn->mtu, len);
2617
2618 skb = bt_skb_alloc(count, GFP_ATOMIC);
2619 if (!skb)
2620 return NULL;
2621
2622 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2623 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2624
2625 if (conn->hcon->type == LE_LINK)
2626 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
2627 else
2628 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2629
2630 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2631 cmd->code = code;
2632 cmd->ident = ident;
aca3192c 2633 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2634
2635 if (dlen) {
2636 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2637 memcpy(skb_put(skb, count), data, count);
2638 data += count;
2639 }
2640
2641 len -= skb->len;
2642
2643 /* Continuation fragments (no L2CAP header) */
2644 frag = &skb_shinfo(skb)->frag_list;
2645 while (len) {
2646 count = min_t(unsigned int, conn->mtu, len);
2647
2648 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2649 if (!*frag)
2650 goto fail;
2651
2652 memcpy(skb_put(*frag, count), data, count);
2653
2654 len -= count;
2655 data += count;
2656
2657 frag = &(*frag)->next;
2658 }
2659
2660 return skb;
2661
2662fail:
2663 kfree_skb(skb);
2664 return NULL;
2665}
2666
2667static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2668{
2669 struct l2cap_conf_opt *opt = *ptr;
2670 int len;
2671
2672 len = L2CAP_CONF_OPT_SIZE + opt->len;
2673 *ptr += len;
2674
2675 *type = opt->type;
2676 *olen = opt->len;
2677
2678 switch (opt->len) {
2679 case 1:
2680 *val = *((u8 *) opt->val);
2681 break;
2682
2683 case 2:
bfaaeb3e 2684 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2685 break;
2686
2687 case 4:
bfaaeb3e 2688 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2689 break;
2690
2691 default:
2692 *val = (unsigned long) opt->val;
2693 break;
2694 }
2695
2696 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2697 return len;
2698}
2699
1da177e4
LT		 2700static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2701{
2702 struct l2cap_conf_opt *opt = *ptr;
2703
2704 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2705
2706 opt->type = type;
2707 opt->len = len;
2708
2709 switch (len) {
2710 case 1:
2711 *((u8 *) opt->val) = val;
2712 break;
2713
2714 case 2:
4f8b691c 2715 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2716 break;
2717
2718 case 4:
4f8b691c 2719 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2720 break;
2721
2722 default:
2723 memcpy(opt->val, (void *) val, len);
2724 break;
2725 }
2726
2727 *ptr += L2CAP_CONF_OPT_SIZE + len;
2728}
2729
f89cef09
AE		 2730static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2731{
2732 struct l2cap_conf_efs efs;
2733
1ec918ce 2734 switch (chan->mode) {
f89cef09
AE		 2735 case L2CAP_MODE_ERTM:
2736 efs.id = chan->local_id;
2737 efs.stype = chan->local_stype;
2738 efs.msdu = cpu_to_le16(chan->local_msdu);
2739 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2740 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2741 efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO);
2742 break;
2743
2744 case L2CAP_MODE_STREAMING:
2745 efs.id = 1;
2746 efs.stype = L2CAP_SERV_BESTEFFORT;
2747 efs.msdu = cpu_to_le16(chan->local_msdu);
2748 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2749 efs.acc_lat = 0;
2750 efs.flush_to = 0;
2751 break;
2752
2753 default:
2754 return;
2755 }
2756
2757 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
2758 (unsigned long) &efs);
2759}
2760
721c4181 2761static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 2762{
721c4181 2763 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 2764 ack_timer.work);
2765 u16 frames_to_ack;
c1b4f43b 2766
2fb9b3d4
GP		 2767 BT_DBG("chan %p", chan);
2768
6be36555
AE		 2769 l2cap_chan_lock(chan);
2770
0362520b
MM		 2771 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2772 chan->last_acked_seq);
6be36555 2773
0362520b
MM		 2774 if (frames_to_ack)
2775 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 2776
0362520b 2777 l2cap_chan_unlock(chan);
09bfb2ee 2778 l2cap_chan_put(chan);
c1b4f43b
GP		 2779}
2780
3c588192 2781static inline int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 2782{
3c588192
MM		 2783 int err;
2784
105bdf9e
MM		 2785 chan->next_tx_seq = 0;
2786 chan->expected_tx_seq = 0;
42e5c802 2787 chan->expected_ack_seq = 0;
6a026610 2788 chan->unacked_frames = 0;
42e5c802 2789 chan->buffer_seq = 0;
6a026610 2790 chan->frames_sent = 0;
105bdf9e
MM		 2791 chan->last_acked_seq = 0;
2792 chan->sdu = NULL;
2793 chan->sdu_last_frag = NULL;
2794 chan->sdu_len = 0;
2795
d34c34fb
MM		 2796 skb_queue_head_init(&chan->tx_q);
2797
105bdf9e
MM		 2798 if (chan->mode != L2CAP_MODE_ERTM)
2799 return 0;
2800
2801 chan->rx_state = L2CAP_RX_STATE_RECV;
2802 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 2803
721c4181
GP		 2804 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2805 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2806 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 2807
f1c6775b 2808 skb_queue_head_init(&chan->srej_q);
1890d36b 2809
3c588192
MM		 2810 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
2811 if (err < 0)
2812 return err;
2813
9dc9affc
MM		 2814 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
2815 if (err < 0)
2816 l2cap_seq_list_free(&chan->srej_list);
2817
2818 return err;
0565c1c2
GP		 2819}
2820
f2fcfcd6
GP		 2821static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2822{
2823 switch (mode) {
2824 case L2CAP_MODE_STREAMING:
2825 case L2CAP_MODE_ERTM:
2826 if (l2cap_mode_supported(mode, remote_feat_mask))
2827 return mode;
2828 /* fall through */
2829 default:
2830 return L2CAP_MODE_BASIC;
2831 }
2832}
2833
6327eb98
AE		 2834static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2835{
2836 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2837}
2838
f89cef09
AE		 2839static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2840{
2841 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2842}
2843
6327eb98
AE		 2844static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
2845{
2846 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
836be934 2847 __l2cap_ews_supported(chan)) {
6327eb98
AE		 2848 /* use extended control field */
2849 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 2850 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
2851 } else {
6327eb98
AE		 2852 chan->tx_win = min_t(u16, chan->tx_win,
2853 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 2854 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
2855 }
6327eb98
AE		 2856}
2857
710f9b0a 2858static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2859{
1da177e4 2860 struct l2cap_conf_req *req = data;
0c1bc5c6 2861 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 2862 void *ptr = req->data;
c8f79162 2863 u16 size;
1da177e4 2864
49208c9c 2865 BT_DBG("chan %p", chan);
1da177e4 2866
73ffa904 2867 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 2868 goto done;
2869
0c1bc5c6 2870 switch (chan->mode) {
f2fcfcd6
GP		 2871 case L2CAP_MODE_STREAMING:
2872 case L2CAP_MODE_ERTM:
c1360a1c 2873 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 2874 break;
85eb53c6 2875
f89cef09
AE		 2876 if (__l2cap_efs_supported(chan))
2877 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2878
2ba13ed6 2879 /* fall through */
f2fcfcd6 2880 default:
8c1d787b 2881 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 2882 break;
2883 }
2884
2885done:
0c1bc5c6
GP		 2886 if (chan->imtu != L2CAP_DEFAULT_MTU)
2887 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 2888
0c1bc5c6 2889 switch (chan->mode) {
65c7c491 2890 case L2CAP_MODE_BASIC:
8c1d787b
GP		 2891 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2892 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 2893 break;
2894
62547752
GP		 2895 rfc.mode = L2CAP_MODE_BASIC;
2896 rfc.txwin_size = 0;
2897 rfc.max_transmit = 0;
2898 rfc.retrans_timeout = 0;
2899 rfc.monitor_timeout = 0;
2900 rfc.max_pdu_size = 0;
2901
63406504
GP		 2902 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2903 (unsigned long) &rfc);
65c7c491
MH		 2904 break;
2905
2906 case L2CAP_MODE_ERTM:
2907 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 2908 rfc.max_transmit = chan->max_tx;
f2fcfcd6
GP		 2909 rfc.retrans_timeout = 0;
2910 rfc.monitor_timeout = 0;
c8f79162
AE		 2911
2912 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2913 L2CAP_EXT_HDR_SIZE -
2914 L2CAP_SDULEN_SIZE -
2915 L2CAP_FCS_SIZE);
2916 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 2917
6327eb98
AE		 2918 l2cap_txwin_setup(chan);
2919
2920 rfc.txwin_size = min_t(u16, chan->tx_win,
2921 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 2922
63406504
GP		 2923 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2924 (unsigned long) &rfc);
2925
f89cef09
AE		 2926 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2927 l2cap_add_opt_efs(&ptr, chan);
2928
8c1d787b 2929 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2930 break;
2931
47d1ec61 2932 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2933 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2934 chan->fcs = L2CAP_FCS_NONE;
2935 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2936 }
6327eb98
AE		 2937
2938 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2939 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2940 chan->tx_win);
f2fcfcd6
GP		 2941 break;
2942
2943 case L2CAP_MODE_STREAMING:
2944 rfc.mode = L2CAP_MODE_STREAMING;
2945 rfc.txwin_size = 0;
2946 rfc.max_transmit = 0;
2947 rfc.retrans_timeout = 0;
2948 rfc.monitor_timeout = 0;
c8f79162
AE		 2949
2950 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2951 L2CAP_EXT_HDR_SIZE -
2952 L2CAP_SDULEN_SIZE -
2953 L2CAP_FCS_SIZE);
2954 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 2955
63406504
GP		 2956 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2957 (unsigned long) &rfc);
2958
f89cef09
AE		 2959 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2960 l2cap_add_opt_efs(&ptr, chan);
2961
8c1d787b 2962 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2963 break;
2964
47d1ec61 2965 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2966 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2967 chan->fcs = L2CAP_FCS_NONE;
2968 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2969 }
65c7c491
MH		 2970 break;
2971 }
1da177e4 2972
fe4128e0 2973 req->dcid = cpu_to_le16(chan->dcid);
aca3192c 2974 req->flags = cpu_to_le16(0);
1da177e4
LT		 2975
2976 return ptr - data;
2977}
2978
73ffa904 2979static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2980{
5dee9e7c
MH		 2981 struct l2cap_conf_rsp *rsp = data;
2982 void *ptr = rsp->data;
73ffa904
GP		 2983 void *req = chan->conf_req;
2984 int len = chan->conf_len;
5dee9e7c
MH		 2985 int type, hint, olen;
2986 unsigned long val;
6464f35f 2987 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 2988 struct l2cap_conf_efs efs;
2989 u8 remote_efs = 0;
861d6882 2990 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2991 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 2992 u16 size;
1da177e4 2993
73ffa904 2994 BT_DBG("chan %p", chan);
820ae1b8 2995
5dee9e7c
MH		 2996 while (len >= L2CAP_CONF_OPT_SIZE) {
2997 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2998
589d2746 2999 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3000 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3001
3002 switch (type) {
3003 case L2CAP_CONF_MTU:
861d6882 3004 mtu = val;
5dee9e7c
MH		 3005 break;
3006
3007 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3008 chan->flush_to = val;
5dee9e7c
MH		 3009 break;
3010
3011 case L2CAP_CONF_QOS:
3012 break;
3013
6464f35f
MH		 3014 case L2CAP_CONF_RFC:
3015 if (olen == sizeof(rfc))
3016 memcpy(&rfc, (void *) val, olen);
3017 break;
3018
fcc203c3
GP		 3019 case L2CAP_CONF_FCS:
3020 if (val == L2CAP_FCS_NONE)
c1360a1c 3021 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 3022 break;
fcc203c3 3023
42dceae2
AE		 3024 case L2CAP_CONF_EFS:
3025 remote_efs = 1;
3026 if (olen == sizeof(efs))
3027 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3028 break;
3029
6327eb98
AE		 3030 case L2CAP_CONF_EWS:
3031 if (!enable_hs)
3032 return -ECONNREFUSED;
fcc203c3 3033
6327eb98
AE		 3034 set_bit(FLAG_EXT_CTRL, &chan->flags);
3035 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3036 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3037 chan->remote_tx_win = val;
fcc203c3
GP		 3038 break;
3039
5dee9e7c
MH		 3040 default:
3041 if (hint)
3042 break;
3043
3044 result = L2CAP_CONF_UNKNOWN;
3045 *((u8 *) ptr++) = type;
3046 break;
3047 }
3048 }
3049
73ffa904 3050 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3051 goto done;
3052
0c1bc5c6 3053 switch (chan->mode) {
f2fcfcd6
GP		 3054 case L2CAP_MODE_STREAMING:
3055 case L2CAP_MODE_ERTM:
c1360a1c 3056 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3057 chan->mode = l2cap_select_mode(rfc.mode,
8c1d787b 3058 chan->conn->feat_mask);
85eb53c6
GP		 3059 break;
3060 }
3061
42dceae2
AE		 3062 if (remote_efs) {
3063 if (__l2cap_efs_supported(chan))
3064 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3065 else
3066 return -ECONNREFUSED;
3067 }
3068
0c1bc5c6 3069 if (chan->mode != rfc.mode)
f2fcfcd6 3070 return -ECONNREFUSED;
742e519b 3071
f2fcfcd6 3072 break;
f2fcfcd6
GP		 3073 }
3074
3075done:
0c1bc5c6 3076 if (chan->mode != rfc.mode) {
f2fcfcd6 3077 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3078 rfc.mode = chan->mode;
f2fcfcd6 3079
73ffa904 3080 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3081 return -ECONNREFUSED;
3082
3083 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3084 sizeof(rfc), (unsigned long) &rfc);
3085 }
3086
5dee9e7c
MH		 3087 if (result == L2CAP_CONF_SUCCESS) {
3088 /* Configure output options and let the other side know
3089 * which ones we don't like. */
3090
f2fcfcd6
GP		 3091 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3092 result = L2CAP_CONF_UNACCEPT;
3093 else {
0c1bc5c6 3094 chan->omtu = mtu;
c1360a1c 3095 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3096 }
0c1bc5c6 3097 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3098
42dceae2
AE		 3099 if (remote_efs) {
3100 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3101 efs.stype != L2CAP_SERV_NOTRAFIC &&
3102 efs.stype != chan->local_stype) {
3103
3104 result = L2CAP_CONF_UNACCEPT;
3105
3106 if (chan->num_conf_req >= 1)
3107 return -ECONNREFUSED;
3108
3109 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3e6b3b95 3110 sizeof(efs),
42dceae2 3111 (unsigned long) &efs);
0e8b207e 3112 } else {
3e6b3b95 3113 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3114 result = L2CAP_CONF_PENDING;
3115 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3116 }
3117 }
3118
f2fcfcd6
GP		 3119 switch (rfc.mode) {
3120 case L2CAP_MODE_BASIC:
47d1ec61 3121 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3122 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3123 break;
3124
3125 case L2CAP_MODE_ERTM:
6327eb98
AE		 3126 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3127 chan->remote_tx_win = rfc.txwin_size;
3128 else
3129 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3130
2c03a7a4 3131 chan->remote_max_tx = rfc.max_transmit;
1c762159 3132
c8f79162
AE		 3133 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3134 chan->conn->mtu -
3135 L2CAP_EXT_HDR_SIZE -
3136 L2CAP_SDULEN_SIZE -
3137 L2CAP_FCS_SIZE);
3138 rfc.max_pdu_size = cpu_to_le16(size);
3139 chan->remote_mps = size;
f2fcfcd6 3140
10467e9e 3141 rfc.retrans_timeout =
4fd21a88 3142 __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
10467e9e 3143 rfc.monitor_timeout =
4fd21a88 3144 __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6 3145
c1360a1c 3146 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3147
3148 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3149 sizeof(rfc), (unsigned long) &rfc);
3150
42dceae2
AE		 3151 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3152 chan->remote_id = efs.id;
3153 chan->remote_stype = efs.stype;
3154 chan->remote_msdu = le16_to_cpu(efs.msdu);
3155 chan->remote_flush_to =
3156 le32_to_cpu(efs.flush_to);
3157 chan->remote_acc_lat =
3158 le32_to_cpu(efs.acc_lat);
3159 chan->remote_sdu_itime =
3160 le32_to_cpu(efs.sdu_itime);
3161 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3162 sizeof(efs), (unsigned long) &efs);
3163 }
f2fcfcd6
GP		 3164 break;
3165
3166 case L2CAP_MODE_STREAMING:
c8f79162
AE		 3167 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3168 chan->conn->mtu -
3169 L2CAP_EXT_HDR_SIZE -
3170 L2CAP_SDULEN_SIZE -
3171 L2CAP_FCS_SIZE);
3172 rfc.max_pdu_size = cpu_to_le16(size);
3173 chan->remote_mps = size;
f2fcfcd6 3174
c1360a1c 3175 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3176
3177 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3178 sizeof(rfc), (unsigned long) &rfc);
3179
f2fcfcd6
GP		 3180 break;
3181
3182 default:
5dee9e7c 3183 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3184
6464f35f 3185 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3186 rfc.mode = chan->mode;
f2fcfcd6 3187 }
6464f35f 3188
f2fcfcd6 3189 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3190 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3191 }
fe4128e0 3192 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c
MH		 3193 rsp->result = cpu_to_le16(result);
3194 rsp->flags = cpu_to_le16(0x0000);
3195
3196 return ptr - data;
1da177e4
LT		 3197}
3198
b4450035 3199static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
f2fcfcd6 3200{
f2fcfcd6
GP		 3201 struct l2cap_conf_req *req = data;
3202 void *ptr = req->data;
3203 int type, olen;
3204 unsigned long val;
36e999a8 3205 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3206 struct l2cap_conf_efs efs;
f2fcfcd6 3207
fe4128e0 3208 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3209
3210 while (len >= L2CAP_CONF_OPT_SIZE) {
3211 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3212
3213 switch (type) {
3214 case L2CAP_CONF_MTU:
3215 if (val < L2CAP_DEFAULT_MIN_MTU) {
3216 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3217 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3218 } else
0c1bc5c6
GP		 3219 chan->imtu = val;
3220 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3221 break;
3222
3223 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3224 chan->flush_to = val;
f2fcfcd6 3225 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
0c1bc5c6 3226 2, chan->flush_to);
f2fcfcd6
GP		 3227 break;
3228
3229 case L2CAP_CONF_RFC:
3230 if (olen == sizeof(rfc))
3231 memcpy(&rfc, (void *)val, olen);
3232
c1360a1c 3233 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
0c1bc5c6 3234 rfc.mode != chan->mode)
f2fcfcd6
GP		 3235 return -ECONNREFUSED;
3236
47d1ec61 3237 chan->fcs = 0;
f2fcfcd6
GP		 3238
3239 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3240 sizeof(rfc), (unsigned long) &rfc);
3241 break;
6327eb98
AE		 3242
3243 case L2CAP_CONF_EWS:
3244 chan->tx_win = min_t(u16, val,
3245 L2CAP_DEFAULT_EXT_WINDOW);
3e6b3b95
GP		 3246 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3247 chan->tx_win);
6327eb98 3248 break;
66af7aaf
AE		 3249
3250 case L2CAP_CONF_EFS:
3251 if (olen == sizeof(efs))
3252 memcpy(&efs, (void *)val, olen);
3253
3254 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3255 efs.stype != L2CAP_SERV_NOTRAFIC &&
3256 efs.stype != chan->local_stype)
3257 return -ECONNREFUSED;
3258
3259 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3260 sizeof(efs), (unsigned long) &efs);
3261 break;
f2fcfcd6
GP		 3262 }
3263 }
3264
0c1bc5c6 3265 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3266 return -ECONNREFUSED;
3267
0c1bc5c6 3268 chan->mode = rfc.mode;
6c2ea7a8 3269
0e8b207e 3270 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3271 switch (rfc.mode) {
3272 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3273 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3274 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3275 chan->mps = le16_to_cpu(rfc.max_pdu_size);
66af7aaf
AE		 3276
3277 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3278 chan->local_msdu = le16_to_cpu(efs.msdu);
3279 chan->local_sdu_itime =
3280 le32_to_cpu(efs.sdu_itime);
3281 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3282 chan->local_flush_to =
3283 le32_to_cpu(efs.flush_to);
3284 }
f2fcfcd6 3285 break;
66af7aaf 3286
f2fcfcd6 3287 case L2CAP_MODE_STREAMING:
47d1ec61 3288 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3289 }
3290 }
3291
fe4128e0 3292 req->dcid = cpu_to_le16(chan->dcid);
f2fcfcd6
GP		 3293 req->flags = cpu_to_le16(0x0000);
3294
3295 return ptr - data;
3296}
3297
fe4128e0 3298static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1da177e4
LT		 3299{
3300 struct l2cap_conf_rsp *rsp = data;
3301 void *ptr = rsp->data;
1da177e4 3302
fe4128e0 3303 BT_DBG("chan %p", chan);
1da177e4 3304
fe4128e0 3305 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3306 rsp->result = cpu_to_le16(result);
aca3192c 3307 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3308
3309 return ptr - data;
3310}
3311
8c1d787b 3312void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3313{
3314 struct l2cap_conn_rsp rsp;
8c1d787b 3315 struct l2cap_conn *conn = chan->conn;
710f9b0a
GP		 3316 u8 buf[128];
3317
fe4128e0
GP		 3318 rsp.scid = cpu_to_le16(chan->dcid);
3319 rsp.dcid = cpu_to_le16(chan->scid);
710f9b0a
GP		 3320 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3321 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
3322 l2cap_send_cmd(conn, chan->ident,
3323 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
3324
c1360a1c 3325 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3326 return;
3327
710f9b0a
GP		 3328 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3329 l2cap_build_conf_req(chan, buf), buf);
3330 chan->num_conf_req++;
3331}
3332
47d1ec61 3333static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3334{
7b1c0049
GP		 3335 int type, olen;
3336 unsigned long val;
3337 struct l2cap_conf_rfc rfc;
3338
47d1ec61 3339 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3340
0c1bc5c6 3341 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3342 return;
3343
3344 while (len >= L2CAP_CONF_OPT_SIZE) {
3345 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3346
3347 switch (type) {
3348 case L2CAP_CONF_RFC:
3349 if (olen == sizeof(rfc))
3350 memcpy(&rfc, (void *)val, olen);
3351 goto done;
3352 }
3353 }
3354
36e999a8
MM		 3355 /* Use sane default values in case a misbehaving remote device
3356 * did not send an RFC option.
3357 */
3358 rfc.mode = chan->mode;
3359 rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3360 rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3361 rfc.max_pdu_size = cpu_to_le16(chan->imtu);
3362
3363 BT_ERR("Expected RFC option was not found, using defaults");
3364
7b1c0049
GP		 3365done:
3366 switch (rfc.mode) {
3367 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3368 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3369 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3370 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3371 break;
3372 case L2CAP_MODE_STREAMING:
47d1ec61 3373 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3374 }
3375}
3376
4e8402a3
MH		 3377static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3378{
e2fd318e 3379 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3380
e2fd318e 3381 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3382 return 0;
3383
3384 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
3385 cmd->ident == conn->info_ident) {
17cd3f37 3386 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3387
3388 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3389 conn->info_ident = 0;
984947dc 3390
4e8402a3
MH		 3391 l2cap_conn_start(conn);
3392 }
3393
3394 return 0;
3395}
3396
1da177e4
LT		 3397static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3398{
1da177e4
LT		 3399 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3400 struct l2cap_conn_rsp rsp;
23691d75 3401 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3402 struct sock *parent, *sk = NULL;
e7c29cb1 3403 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3404
3405 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3406 __le16 psm = req->psm;
1da177e4 3407
097db76c 3408 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3409
3410 /* Check if we have socket listening on psm */
c2287681 3411 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 3412 if (!pchan) {
1da177e4
LT		 3413 result = L2CAP_CR_BAD_PSM;
3414 goto sendresp;
3415 }
3416
23691d75
GP		 3417 parent = pchan->sk;
3418
3df91ea2 3419 mutex_lock(&conn->chan_lock);
aa2ac881 3420 lock_sock(parent);
e0f0cb56 3421
e7c29cb1
MH		 3422 /* Check if the ACL is secure enough (if not SDP) */
3423 if (psm != cpu_to_le16(0x0001) &&
3424 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3425 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3426 result = L2CAP_CR_SEC_BLOCK;
3427 goto response;
3428 }
3429
1da177e4
LT		 3430 result = L2CAP_CR_NO_MEM;
3431
3432 /* Check for backlog size */
3433 if (sk_acceptq_is_full(parent)) {
8e87d142 3434 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 3435 goto response;
3436 }
3437
80808e43
GP		 3438 chan = pchan->ops->new_connection(pchan->data);
3439 if (!chan)
1da177e4
LT		 3440 goto response;
3441
80808e43
GP		 3442 sk = chan->sk;
3443
1da177e4 3444 /* Check if we already have channel with that dcid */
baa7e1fa 3445 if (__l2cap_get_chan_by_dcid(conn, scid)) {
1da177e4 3446 sock_set_flag(sk, SOCK_ZAPPED);
ba3bd0ee 3447 chan->ops->close(chan->data);
1da177e4
LT		 3448 goto response;
3449 }
3450
3451 hci_conn_hold(conn->hcon);
3452
1da177e4
LT		 3453 bacpy(&bt_sk(sk)->src, conn->src);
3454 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3455 chan->psm = psm;
3456 chan->dcid = scid;
1da177e4 3457
d1010240
GP		 3458 bt_accept_enqueue(parent, sk);
3459
6be36555 3460 __l2cap_chan_add(conn, chan);
48454079 3461
fe4128e0 3462 dcid = chan->scid;
1da177e4 3463
c9b66675 3464 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3465
fc7f8a7e 3466 chan->ident = cmd->ident;
1da177e4 3467
984947dc 3468 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3469 if (l2cap_chan_check_security(chan)) {
c5daa683 3470 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
0e587be7 3471 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3472 result = L2CAP_CR_PEND;
3473 status = L2CAP_CS_AUTHOR_PEND;
3474 parent->sk_data_ready(parent, 0);
3475 } else {
0e587be7 3476 __l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 3477 result = L2CAP_CR_SUCCESS;
3478 status = L2CAP_CS_NO_INFO;
3479 }
79d554a6 3480 } else {
0e587be7 3481 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3482 result = L2CAP_CR_PEND;
3483 status = L2CAP_CS_AUTHEN_PEND;
3484 }
3485 } else {
0e587be7 3486 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3487 result = L2CAP_CR_PEND;
3488 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3489 }
3490
1da177e4 3491response:
aa2ac881 3492 release_sock(parent);
3df91ea2 3493 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3494
3495sendresp:
aca3192c
YH		 3496 rsp.scid = cpu_to_le16(scid);
3497 rsp.dcid = cpu_to_le16(dcid);
3498 rsp.result = cpu_to_le16(result);
3499 rsp.status = cpu_to_le16(status);
1da177e4 3500 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 3501
3502 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3503 struct l2cap_info_req info;
3504 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3505
3506 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3507 conn->info_ident = l2cap_get_ident(conn);
3508
ba13ccd9 3509 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6
MH		 3510
3511 l2cap_send_cmd(conn, conn->info_ident,
3512 L2CAP_INFO_REQ, sizeof(info), &info);
3513 }
3514
c1360a1c 3515 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
e9aeb2dd
GP		 3516 result == L2CAP_CR_SUCCESS) {
3517 u8 buf[128];
c1360a1c 3518 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3519 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3520 l2cap_build_conf_req(chan, buf), buf);
3521 chan->num_conf_req++;
e9aeb2dd
GP		 3522 }
3523
1da177e4
LT		 3524 return 0;
3525}
3526
3527static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3528{
3529 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3530 u16 scid, dcid, result, status;
48454079 3531 struct l2cap_chan *chan;
1da177e4 3532 u8 req[128];
3df91ea2 3533 int err;
1da177e4
LT		 3534
3535 scid = __le16_to_cpu(rsp->scid);
3536 dcid = __le16_to_cpu(rsp->dcid);
3537 result = __le16_to_cpu(rsp->result);
3538 status = __le16_to_cpu(rsp->status);
3539
1b009c98
AE		 3540 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3541 dcid, scid, result, status);
1da177e4 3542
3df91ea2
AE		 3543 mutex_lock(&conn->chan_lock);
3544
1da177e4 3545 if (scid) {
3df91ea2
AE		 3546 chan = __l2cap_get_chan_by_scid(conn, scid);
3547 if (!chan) {
3548 err = -EFAULT;
3549 goto unlock;
3550 }
1da177e4 3551 } else {
3df91ea2
AE		 3552 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3553 if (!chan) {
3554 err = -EFAULT;
3555 goto unlock;
3556 }
1da177e4
LT		 3557 }
3558
3df91ea2
AE		 3559 err = 0;
3560
6be36555 3561 l2cap_chan_lock(chan);
48454079 3562
1da177e4
LT		 3563 switch (result) {
3564 case L2CAP_CR_SUCCESS:
89bc500e 3565 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3566 chan->ident = 0;
fe4128e0 3567 chan->dcid = dcid;
c1360a1c 3568 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3569
c1360a1c 3570 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3571 break;
3572
1da177e4 3573 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3574 l2cap_build_conf_req(chan, req), req);
3575 chan->num_conf_req++;
1da177e4
LT		 3576 break;
3577
3578 case L2CAP_CR_PEND:
c1360a1c 3579 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3580 break;
3581
3582 default:
48454079 3583 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3584 break;
3585 }
3586
6be36555 3587 l2cap_chan_unlock(chan);
3df91ea2
AE		 3588
3589unlock:
3590 mutex_unlock(&conn->chan_lock);
3591
3592 return err;
1da177e4
LT		 3593}
3594
47d1ec61 3595static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3596{
3597 /* FCS is enabled only in ERTM or streaming mode, if one or both
3598 * sides request it.
3599 */
0c1bc5c6 3600 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3601 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3602 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 3603 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3604}
3605
88219a0f 3606static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3607{
3608 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3609 u16 dcid, flags;
3610 u8 rsp[64];
48454079 3611 struct l2cap_chan *chan;
3c588192 3612 int len, err = 0;
1da177e4
LT		 3613
3614 dcid = __le16_to_cpu(req->dcid);
3615 flags = __le16_to_cpu(req->flags);
3616
3617 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3618
baa7e1fa 3619 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3620 if (!chan)
1da177e4
LT		 3621 return -ENOENT;
3622
033b1142 3623 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3624 struct l2cap_cmd_rej_cid rej;
3625
3626 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
3627 rej.scid = cpu_to_le16(chan->scid);
3628 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3629
df6bd743
GP		 3630 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
3631 sizeof(rej), &rej);
354f60a9 3632 goto unlock;
df6bd743 3633 }
354f60a9 3634
5dee9e7c 3635 /* Reject if config buffer is too small. */
88219a0f 3636 len = cmd_len - sizeof(*req);
7ac28817 3637 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3638 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 3639 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c
MH		 3640 L2CAP_CONF_REJECT, flags), rsp);
3641 goto unlock;
3642 }
3643
3644 /* Store config. */
73ffa904
GP		 3645 memcpy(chan->conf_req + chan->conf_len, req->data, len);
3646 chan->conf_len += len;
1da177e4
LT		 3647
3648 if (flags & 0x0001) {
3649 /* Incomplete config. Send empty response. */
3650 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 3651 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c 3652 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 3653 goto unlock;
3654 }
3655
3656 /* Complete config. */
73ffa904 3657 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 3658 if (len < 0) {
e92c8e70 3659 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 3660 goto unlock;
f2fcfcd6 3661 }
1da177e4 3662
5dee9e7c 3663 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 3664 chan->num_conf_rsp++;
5dee9e7c 3665
5dee9e7c 3666 /* Reset config buffer. */
73ffa904 3667 chan->conf_len = 0;
5dee9e7c 3668
c1360a1c 3669 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 3670 goto unlock;
3671
c1360a1c 3672 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 3673 set_default_fcs(chan);
fcc203c3 3674
89bc500e 3675 l2cap_state_change(chan, BT_CONNECTED);
e90bac06 3676
105bdf9e
MM		 3677 if (chan->mode == L2CAP_MODE_ERTM ||
3678 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 3679 err = l2cap_ertm_init(chan);
3680
3681 if (err < 0)
3682 l2cap_send_disconn_req(chan->conn, chan, -err);
3683 else
3684 l2cap_chan_ready(chan);
0565c1c2 3685
876d9484
MH		 3686 goto unlock;
3687 }
3688
c1360a1c 3689 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 3690 u8 buf[64];
1da177e4 3691 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3692 l2cap_build_conf_req(chan, buf), buf);
3693 chan->num_conf_req++;
1da177e4
LT		 3694 }
3695
0e8b207e
AE		 3696 /* Got Conf Rsp PENDING from remote side and asume we sent
3697 Conf Rsp PENDING in the code above */
3698 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
3699 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3700
3701 /* check compatibility */
3702
3703 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3704 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3705
3706 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 3707 l2cap_build_conf_rsp(chan, rsp,
0e8b207e
AE		 3708 L2CAP_CONF_SUCCESS, 0x0000), rsp);
3709 }
3710
1da177e4 3711unlock:
6be36555 3712 l2cap_chan_unlock(chan);
3c588192 3713 return err;
1da177e4
LT		 3714}
3715
3716static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3717{
3718 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3719 u16 scid, flags, result;
48454079 3720 struct l2cap_chan *chan;
61386cba 3721 int len = le16_to_cpu(cmd->len) - sizeof(*rsp);
3c588192 3722 int err = 0;
1da177e4
LT		 3723
3724 scid = __le16_to_cpu(rsp->scid);
3725 flags = __le16_to_cpu(rsp->flags);
3726 result = __le16_to_cpu(rsp->result);
3727
61386cba
AE		 3728 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
3729 result, len);
1da177e4 3730
baa7e1fa 3731 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3732 if (!chan)
1da177e4
LT		 3733 return 0;
3734
3735 switch (result) {
3736 case L2CAP_CONF_SUCCESS:
47d1ec61 3737 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 3738 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 3739 break;
3740
0e8b207e
AE		 3741 case L2CAP_CONF_PENDING:
3742 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
3743
3744 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3745 char buf[64];
3746
3747 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
3748 buf, &result);
3749 if (len < 0) {
3750 l2cap_send_disconn_req(conn, chan, ECONNRESET);
3751 goto done;
3752 }
3753
3754 /* check compatibility */
3755
3756 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3757 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3758
3759 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 3760 l2cap_build_conf_rsp(chan, buf,
0e8b207e
AE		 3761 L2CAP_CONF_SUCCESS, 0x0000), buf);
3762 }
3763 goto done;
3764
1da177e4 3765 case L2CAP_CONF_UNACCEPT:
73ffa904 3766 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3767 char req[64];
3768
c2c77ec8 3769 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 3770 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 3771 goto done;
3772 }
3773
f2fcfcd6
GP		 3774 /* throw out any old stored conf requests */
3775 result = L2CAP_CONF_SUCCESS;
b4450035
GP		 3776 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
3777 req, &result);
f2fcfcd6 3778 if (len < 0) {
e92c8e70 3779 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 3780 goto done;
3781 }
3782
3783 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3784 L2CAP_CONF_REQ, len, req);
73ffa904 3785 chan->num_conf_req++;
f2fcfcd6
GP		 3786 if (result != L2CAP_CONF_SUCCESS)
3787 goto done;
3788 break;
1da177e4
LT		 3789 }
3790
8e87d142 3791 default:
6be36555 3792 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 3793
ba13ccd9 3794 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
e92c8e70 3795 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 3796 goto done;
3797 }
3798
3799 if (flags & 0x01)
3800 goto done;
3801
c1360a1c 3802 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 3803
c1360a1c 3804 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 3805 set_default_fcs(chan);
fcc203c3 3806
89bc500e 3807 l2cap_state_change(chan, BT_CONNECTED);
105bdf9e
MM		 3808 if (chan->mode == L2CAP_MODE_ERTM ||
3809 chan->mode == L2CAP_MODE_STREAMING)
3c588192 3810 err = l2cap_ertm_init(chan);
0565c1c2 3811
3c588192
MM		 3812 if (err < 0)
3813 l2cap_send_disconn_req(chan->conn, chan, -err);
3814 else
3815 l2cap_chan_ready(chan);
1da177e4
LT		 3816 }
3817
3818done:
6be36555 3819 l2cap_chan_unlock(chan);
3c588192 3820 return err;
1da177e4
LT		 3821}
3822
3823static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3824{
3825 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3826 struct l2cap_disconn_rsp rsp;
3827 u16 dcid, scid;
48454079 3828 struct l2cap_chan *chan;
1da177e4
LT		 3829 struct sock *sk;
3830
3831 scid = __le16_to_cpu(req->scid);
3832 dcid = __le16_to_cpu(req->dcid);
3833
3834 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3835
3df91ea2
AE		 3836 mutex_lock(&conn->chan_lock);
3837
3838 chan = __l2cap_get_chan_by_scid(conn, dcid);
3839 if (!chan) {
3840 mutex_unlock(&conn->chan_lock);
1da177e4 3841 return 0;
3df91ea2 3842 }
1da177e4 3843
6be36555
AE		 3844 l2cap_chan_lock(chan);
3845
48454079
GP		 3846 sk = chan->sk;
3847
fe4128e0
GP		 3848 rsp.dcid = cpu_to_le16(chan->scid);
3849 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 3850 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3851
6be36555 3852 lock_sock(sk);
1da177e4 3853 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 3854 release_sock(sk);
1da177e4 3855
61d6ef3e 3856 l2cap_chan_hold(chan);
48454079 3857 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 3858
3859 l2cap_chan_unlock(chan);
1da177e4 3860
ba3bd0ee 3861 chan->ops->close(chan->data);
61d6ef3e 3862 l2cap_chan_put(chan);
3df91ea2
AE		 3863
3864 mutex_unlock(&conn->chan_lock);
3865
1da177e4
LT		 3866 return 0;
3867}
3868
3869static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3870{
3871 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3872 u16 dcid, scid;
48454079 3873 struct l2cap_chan *chan;
1da177e4
LT		 3874
3875 scid = __le16_to_cpu(rsp->scid);
3876 dcid = __le16_to_cpu(rsp->dcid);
3877
3878 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3879
3df91ea2
AE		 3880 mutex_lock(&conn->chan_lock);
3881
3882 chan = __l2cap_get_chan_by_scid(conn, scid);
3883 if (!chan) {
3884 mutex_unlock(&conn->chan_lock);
1da177e4 3885 return 0;
3df91ea2 3886 }
1da177e4 3887
6be36555 3888 l2cap_chan_lock(chan);
48454079 3889
61d6ef3e 3890 l2cap_chan_hold(chan);
48454079 3891 l2cap_chan_del(chan, 0);
6be36555
AE		 3892
3893 l2cap_chan_unlock(chan);
1da177e4 3894
ba3bd0ee 3895 chan->ops->close(chan->data);
61d6ef3e 3896 l2cap_chan_put(chan);
3df91ea2
AE		 3897
3898 mutex_unlock(&conn->chan_lock);
3899
1da177e4
LT		 3900 return 0;
3901}
3902
3903static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3904{
3905 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3906 u16 type;
3907
3908 type = __le16_to_cpu(req->type);
3909
3910 BT_DBG("type 0x%4.4x", type);
3911
f0709e03
MH		 3912 if (type == L2CAP_IT_FEAT_MASK) {
3913 u8 buf[8];
44dd46de 3914 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3915 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3916 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3917 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3918 if (!disable_ertm)
fcc203c3
GP		 3919 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3920 | L2CAP_FEAT_FCS;
a5fd6f30 3921 if (enable_hs)
6327eb98
AE		 3922 feat_mask |= L2CAP_FEAT_EXT_FLOW
3923 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 3924
1b7bf4ed 3925 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3926 l2cap_send_cmd(conn, cmd->ident,
3927 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3928 } else if (type == L2CAP_IT_FIXED_CHAN) {
3929 u8 buf[12];
3930 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 3931
3932 if (enable_hs)
3933 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
3934 else
3935 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
3936
e1027a7c
MH		 3937 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3938 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 3939 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
e1027a7c
MH		 3940 l2cap_send_cmd(conn, cmd->ident,
3941 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3942 } else {
3943 struct l2cap_info_rsp rsp;
3944 rsp.type = cpu_to_le16(type);
3945 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3946 l2cap_send_cmd(conn, cmd->ident,
3947 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3948 }
1da177e4
LT		 3949
3950 return 0;
3951}
3952
3953static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3954{
3955 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3956 u16 type, result;
3957
3958 type = __le16_to_cpu(rsp->type);
3959 result = __le16_to_cpu(rsp->result);
3960
3961 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3962
e90165be
AE		 3963 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
3964 if (cmd->ident != conn->info_ident ||
3965 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
3966 return 0;
3967
17cd3f37 3968 cancel_delayed_work(&conn->info_timer);
4e8402a3 3969
adb08ede
VT		 3970 if (result != L2CAP_IR_SUCCESS) {
3971 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3972 conn->info_ident = 0;
3973
3974 l2cap_conn_start(conn);
3975
3976 return 0;
3977 }
3978
978c93b9
AE		 3979 switch (type) {
3980 case L2CAP_IT_FEAT_MASK:
83985319 3981 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3982
47ec1dcd 3983 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3984 struct l2cap_info_req req;
3985 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3986
3987 conn->info_ident = l2cap_get_ident(conn);
3988
3989 l2cap_send_cmd(conn, conn->info_ident,
3990 L2CAP_INFO_REQ, sizeof(req), &req);
3991 } else {
3992 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3993 conn->info_ident = 0;
3994
3995 l2cap_conn_start(conn);
3996 }
978c93b9
AE		 3997 break;
3998
3999 case L2CAP_IT_FIXED_CHAN:
4000 conn->fixed_chan_mask = rsp->data[0];
984947dc 4001 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4002 conn->info_ident = 0;
984947dc
MH		 4003
4004 l2cap_conn_start(conn);
978c93b9 4005 break;
984947dc 4006 }
4e8402a3 4007
1da177e4
LT		 4008 return 0;
4009}
4010
f94ff6ff
MM		 4011static inline int l2cap_create_channel_req(struct l2cap_conn *conn,
4012 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4013 void *data)
4014{
4015 struct l2cap_create_chan_req *req = data;
4016 struct l2cap_create_chan_rsp rsp;
4017 u16 psm, scid;
4018
4019 if (cmd_len != sizeof(*req))
4020 return -EPROTO;
4021
4022 if (!enable_hs)
4023 return -EINVAL;
4024
4025 psm = le16_to_cpu(req->psm);
4026 scid = le16_to_cpu(req->scid);
4027
4028 BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id);
4029
4030 /* Placeholder: Always reject */
4031 rsp.dcid = 0;
4032 rsp.scid = cpu_to_le16(scid);
8ce0c498
AE		 4033 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4034 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f94ff6ff
MM		 4035
4036 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4037 sizeof(rsp), &rsp);
4038
4039 return 0;
4040}
4041
4042static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn,
4043 struct l2cap_cmd_hdr *cmd, void *data)
4044{
4045 BT_DBG("conn %p", conn);
4046
4047 return l2cap_connect_rsp(conn, cmd, data);
4048}
4049
8d5a04a1
MM		 4050static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
4051 u16 icid, u16 result)
4052{
4053 struct l2cap_move_chan_rsp rsp;
4054
4055 BT_DBG("icid %d, result %d", icid, result);
4056
4057 rsp.icid = cpu_to_le16(icid);
4058 rsp.result = cpu_to_le16(result);
4059
4060 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
4061}
4062
4063static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn,
4064 struct l2cap_chan *chan, u16 icid, u16 result)
4065{
4066 struct l2cap_move_chan_cfm cfm;
4067 u8 ident;
4068
4069 BT_DBG("icid %d, result %d", icid, result);
4070
4071 ident = l2cap_get_ident(conn);
4072 if (chan)
4073 chan->ident = ident;
4074
4075 cfm.icid = cpu_to_le16(icid);
4076 cfm.result = cpu_to_le16(result);
4077
4078 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm);
4079}
4080
4081static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
4082 u16 icid)
4083{
4084 struct l2cap_move_chan_cfm_rsp rsp;
4085
4086 BT_DBG("icid %d", icid);
4087
4088 rsp.icid = cpu_to_le16(icid);
4089 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4090}
4091
4092static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
4093 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
4094{
4095 struct l2cap_move_chan_req *req = data;
4096 u16 icid = 0;
4097 u16 result = L2CAP_MR_NOT_ALLOWED;
4098
4099 if (cmd_len != sizeof(*req))
4100 return -EPROTO;
4101
4102 icid = le16_to_cpu(req->icid);
4103
4104 BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id);
4105
4106 if (!enable_hs)
4107 return -EINVAL;
4108
4109 /* Placeholder: Always refuse */
4110 l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
4111
4112 return 0;
4113}
4114
4115static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
4116 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
4117{
4118 struct l2cap_move_chan_rsp *rsp = data;
4119 u16 icid, result;
4120
4121 if (cmd_len != sizeof(*rsp))
4122 return -EPROTO;
4123
4124 icid = le16_to_cpu(rsp->icid);
4125 result = le16_to_cpu(rsp->result);
4126
4127 BT_DBG("icid %d, result %d", icid, result);
4128
4129 /* Placeholder: Always unconfirmed */
4130 l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED);
4131
4132 return 0;
4133}
4134
4135static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
4136 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
4137{
4138 struct l2cap_move_chan_cfm *cfm = data;
4139 u16 icid, result;
4140
4141 if (cmd_len != sizeof(*cfm))
4142 return -EPROTO;
4143
4144 icid = le16_to_cpu(cfm->icid);
4145 result = le16_to_cpu(cfm->result);
4146
4147 BT_DBG("icid %d, result %d", icid, result);
4148
4149 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4150
4151 return 0;
4152}
4153
4154static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
4155 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
4156{
4157 struct l2cap_move_chan_cfm_rsp *rsp = data;
4158 u16 icid;
4159
4160 if (cmd_len != sizeof(*rsp))
4161 return -EPROTO;
4162
4163 icid = le16_to_cpu(rsp->icid);
4164
4165 BT_DBG("icid %d", icid);
4166
4167 return 0;
4168}
4169
e2174ca4 4170static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
de73115a
CT		 4171 u16 to_multiplier)
4172{
4173 u16 max_latency;
4174
4175 if (min > max || min < 6 || max > 3200)
4176 return -EINVAL;
4177
4178 if (to_multiplier < 10 || to_multiplier > 3200)
4179 return -EINVAL;
4180
4181 if (max >= to_multiplier * 8)
4182 return -EINVAL;
4183
4184 max_latency = (to_multiplier * 8 / max) - 1;
4185 if (latency > 499 || latency > max_latency)
4186 return -EINVAL;
4187
4188 return 0;
4189}
4190
4191static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
4192 struct l2cap_cmd_hdr *cmd, u8 *data)
4193{
4194 struct hci_conn *hcon = conn->hcon;
4195 struct l2cap_conn_param_update_req *req;
4196 struct l2cap_conn_param_update_rsp rsp;
4197 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 4198 int err;
de73115a
CT		 4199
4200 if (!(hcon->link_mode & HCI_LM_MASTER))
4201 return -EINVAL;
4202
4203 cmd_len = __le16_to_cpu(cmd->len);
4204 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
4205 return -EPROTO;
4206
4207 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 4208 min = __le16_to_cpu(req->min);
4209 max = __le16_to_cpu(req->max);
de73115a
CT		 4210 latency = __le16_to_cpu(req->latency);
4211 to_multiplier = __le16_to_cpu(req->to_multiplier);
4212
4213 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
4214 min, max, latency, to_multiplier);
4215
4216 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 4217
4218 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
4219 if (err)
de73115a
CT		 4220 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
4221 else
4222 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
4223
4224 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
4225 sizeof(rsp), &rsp);
4226
2ce603eb
CT		 4227 if (!err)
4228 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
4229
de73115a
CT		 4230 return 0;
4231}
4232
3300d9a9
CT		 4233static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
4234 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4235{
4236 int err = 0;
4237
4238 switch (cmd->code) {
4239 case L2CAP_COMMAND_REJ:
4240 l2cap_command_rej(conn, cmd, data);
4241 break;
4242
4243 case L2CAP_CONN_REQ:
4244 err = l2cap_connect_req(conn, cmd, data);
4245 break;
4246
4247 case L2CAP_CONN_RSP:
4248 err = l2cap_connect_rsp(conn, cmd, data);
4249 break;
4250
4251 case L2CAP_CONF_REQ:
4252 err = l2cap_config_req(conn, cmd, cmd_len, data);
4253 break;
4254
4255 case L2CAP_CONF_RSP:
4256 err = l2cap_config_rsp(conn, cmd, data);
4257 break;
4258
4259 case L2CAP_DISCONN_REQ:
4260 err = l2cap_disconnect_req(conn, cmd, data);
4261 break;
4262
4263 case L2CAP_DISCONN_RSP:
4264 err = l2cap_disconnect_rsp(conn, cmd, data);
4265 break;
4266
4267 case L2CAP_ECHO_REQ:
4268 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
4269 break;
4270
4271 case L2CAP_ECHO_RSP:
4272 break;
4273
4274 case L2CAP_INFO_REQ:
4275 err = l2cap_information_req(conn, cmd, data);
4276 break;
4277
4278 case L2CAP_INFO_RSP:
4279 err = l2cap_information_rsp(conn, cmd, data);
4280 break;
4281
f94ff6ff
MM		 4282 case L2CAP_CREATE_CHAN_REQ:
4283 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
4284 break;
4285
4286 case L2CAP_CREATE_CHAN_RSP:
4287 err = l2cap_create_channel_rsp(conn, cmd, data);
4288 break;
4289
8d5a04a1
MM		 4290 case L2CAP_MOVE_CHAN_REQ:
4291 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
4292 break;
4293
4294 case L2CAP_MOVE_CHAN_RSP:
4295 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
4296 break;
4297
4298 case L2CAP_MOVE_CHAN_CFM:
4299 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
4300 break;
4301
4302 case L2CAP_MOVE_CHAN_CFM_RSP:
4303 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
4304 break;
4305
3300d9a9
CT		 4306 default:
4307 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
4308 err = -EINVAL;
4309 break;
4310 }
4311
4312 return err;
4313}
4314
4315static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
4316 struct l2cap_cmd_hdr *cmd, u8 *data)
4317{
4318 switch (cmd->code) {
4319 case L2CAP_COMMAND_REJ:
4320 return 0;
4321
4322 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 4323 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 4324
4325 case L2CAP_CONN_PARAM_UPDATE_RSP:
4326 return 0;
4327
4328 default:
4329 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
4330 return -EINVAL;
4331 }
4332}
4333
4334static inline void l2cap_sig_channel(struct l2cap_conn *conn,
4335 struct sk_buff *skb)
1da177e4
LT		 4336{
4337 u8 *data = skb->data;
4338 int len = skb->len;
4339 struct l2cap_cmd_hdr cmd;
3300d9a9 4340 int err;
1da177e4
LT		 4341
4342 l2cap_raw_recv(conn, skb);
4343
4344 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 4345 u16 cmd_len;
1da177e4
LT		 4346 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
4347 data += L2CAP_CMD_HDR_SIZE;
4348 len -= L2CAP_CMD_HDR_SIZE;
4349
88219a0f 4350 cmd_len = le16_to_cpu(cmd.len);
1da177e4 4351
88219a0f 4352 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 4353
88219a0f 4354 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 4355 BT_DBG("corrupted command");
4356 break;
4357 }
4358
3300d9a9
CT		 4359 if (conn->hcon->type == LE_LINK)
4360 err = l2cap_le_sig_cmd(conn, &cmd, data);
4361 else
4362 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 4363
4364 if (err) {
e2fd318e 4365 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 4366
4367 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 4368
4369 /* FIXME: Map err to a valid reason */
e2fd318e 4370 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
1da177e4
LT		 4371 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4372 }
4373
88219a0f
AV		 4374 data += cmd_len;
4375 len -= cmd_len;
1da177e4
LT		 4376 }
4377
4378 kfree_skb(skb);
4379}
4380
47d1ec61 4381static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 4382{
4383 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 4384 int hdr_size;
4385
4386 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
4387 hdr_size = L2CAP_EXT_HDR_SIZE;
4388 else
4389 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 4390
47d1ec61 4391 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 4392 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 4393 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
4394 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
4395
4396 if (our_fcs != rcv_fcs)
7a560e5c 4397 return -EBADMSG;
fcc203c3
GP		 4398 }
4399 return 0;
4400}
4401
525cd185 4402static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 4403{
e31f7633 4404 struct l2cap_ctrl control;
d5392c8f 4405
e31f7633 4406 BT_DBG("chan %p", chan);
d5392c8f 4407
e31f7633
MM		 4408 memset(&control, 0, sizeof(control));
4409 control.sframe = 1;
4410 control.final = 1;
4411 control.reqseq = chan->buffer_seq;
4412 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 4413
e2ab4353 4414 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 4415 control.super = L2CAP_SUPER_RNR;
4416 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 4417 }
4418
e31f7633
MM		 4419 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
4420 chan->unacked_frames > 0)
4421 __set_retrans_timer(chan);
d5392c8f 4422
e31f7633 4423 /* Send pending iframes */
525cd185 4424 l2cap_ertm_send(chan);
d5392c8f 4425
e2ab4353 4426 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 4427 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
4428 /* F-bit wasn't sent in an s-frame or i-frame yet, so
4429 * send it now.
4430 */
4431 control.super = L2CAP_SUPER_RR;
4432 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 4433 }
4434}
4435
84084a31
MM		 4436static void append_skb_frag(struct sk_buff *skb,
4437 struct sk_buff *new_frag, struct sk_buff **last_frag)
18778a63 4438{
84084a31
MM		 4439 /* skb->len reflects data in skb as well as all fragments
4440 * skb->data_len reflects only data in fragments
4441 */
4442 if (!skb_has_frag_list(skb))
4443 skb_shinfo(skb)->frag_list = new_frag;
4444
4445 new_frag->next = NULL;
4446
4447 (*last_frag)->next = new_frag;
4448 *last_frag = new_frag;
4449
4450 skb->len += new_frag->len;
4451 skb->data_len += new_frag->len;
4452 skb->truesize += new_frag->truesize;
4453}
4454
4b51dae9
MM		 4455static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
4456 struct l2cap_ctrl *control)
84084a31
MM		 4457{
4458 int err = -EINVAL;
18778a63 4459
4b51dae9 4460 switch (control->sar) {
7e0ef6ee 4461 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 4462 if (chan->sdu)
4463 break;
18778a63 4464
84084a31
MM		 4465 err = chan->ops->recv(chan->data, skb);
4466 break;
18778a63 4467
7e0ef6ee 4468 case L2CAP_SAR_START:
84084a31
MM		 4469 if (chan->sdu)
4470 break;
18778a63 4471
6f61fd47 4472 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 4473 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 4474
84084a31
MM		 4475 if (chan->sdu_len > chan->imtu) {
4476 err = -EMSGSIZE;
4477 break;
4478 }
1890d36b 4479
84084a31
MM		 4480 if (skb->len >= chan->sdu_len)
4481 break;
18778a63 4482
84084a31
MM		 4483 chan->sdu = skb;
4484 chan->sdu_last_frag = skb;
18778a63 4485
84084a31
MM		 4486 skb = NULL;
4487 err = 0;
18778a63
GP		 4488 break;
4489
7e0ef6ee 4490 case L2CAP_SAR_CONTINUE:
6f61fd47 4491 if (!chan->sdu)
84084a31 4492 break;
18778a63 4493
84084a31
MM		 4494 append_skb_frag(chan->sdu, skb,
4495 &chan->sdu_last_frag);
4496 skb = NULL;
18778a63 4497
84084a31
MM		 4498 if (chan->sdu->len >= chan->sdu_len)
4499 break;
4178ba46 4500
84084a31 4501 err = 0;
18778a63
GP		 4502 break;
4503
7e0ef6ee 4504 case L2CAP_SAR_END:
6f61fd47 4505 if (!chan->sdu)
84084a31 4506 break;
18778a63 4507
84084a31
MM		 4508 append_skb_frag(chan->sdu, skb,
4509 &chan->sdu_last_frag);
4510 skb = NULL;
4178ba46 4511
84084a31
MM		 4512 if (chan->sdu->len != chan->sdu_len)
4513 break;
18778a63 4514
84084a31 4515 err = chan->ops->recv(chan->data, chan->sdu);
1890d36b 4516
84084a31
MM		 4517 if (!err) {
4518 /* Reassembly complete */
4519 chan->sdu = NULL;
4520 chan->sdu_last_frag = NULL;
4521 chan->sdu_len = 0;
1890d36b 4522 }
18778a63
GP		 4523 break;
4524 }
4525
84084a31
MM		 4526 if (err) {
4527 kfree_skb(skb);
4528 kfree_skb(chan->sdu);
4529 chan->sdu = NULL;
4530 chan->sdu_last_frag = NULL;
4531 chan->sdu_len = 0;
4532 }
18778a63 4533
84084a31 4534 return err;
18778a63
GP		 4535}
4536
61aa4f5b 4537void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 4538{
61aa4f5b 4539 u8 event;
712132eb 4540
61aa4f5b
MM		 4541 if (chan->mode != L2CAP_MODE_ERTM)
4542 return;
712132eb 4543
61aa4f5b
MM		 4544 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
4545 l2cap_tx(chan, 0, 0, event);
1890d36b
GP		 4546}
4547
d2a7ac5d
MM		 4548static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
4549{
63838725
MM		 4550 int err = 0;
4551 /* Pass sequential frames to l2cap_reassemble_sdu()
4552 * until a gap is encountered.
4553 */
4554
4555 BT_DBG("chan %p", chan);
4556
4557 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4558 struct sk_buff *skb;
4559 BT_DBG("Searching for skb with txseq %d (queue len %d)",
4560 chan->buffer_seq, skb_queue_len(&chan->srej_q));
4561
4562 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
4563
4564 if (!skb)
4565 break;
4566
4567 skb_unlink(skb, &chan->srej_q);
4568 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
4569 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
4570 if (err)
4571 break;
4572 }
4573
4574 if (skb_queue_empty(&chan->srej_q)) {
4575 chan->rx_state = L2CAP_RX_STATE_RECV;
4576 l2cap_send_ack(chan);
4577 }
4578
4579 return err;
d2a7ac5d
MM		 4580}
4581
4582static void l2cap_handle_srej(struct l2cap_chan *chan,
4583 struct l2cap_ctrl *control)
4584{
f80842a8
MM		 4585 struct sk_buff *skb;
4586
4587 BT_DBG("chan %p, control %p", chan, control);
4588
4589 if (control->reqseq == chan->next_tx_seq) {
4590 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
4591 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4592 return;
4593 }
4594
4595 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
4596
4597 if (skb == NULL) {
4598 BT_DBG("Seq %d not available for retransmission",
4599 control->reqseq);
4600 return;
4601 }
4602
4603 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
4604 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
4605 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4606 return;
4607 }
4608
4609 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4610
4611 if (control->poll) {
4612 l2cap_pass_to_tx(chan, control);
4613
4614 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4615 l2cap_retransmit(chan, control);
4616 l2cap_ertm_send(chan);
4617
4618 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
4619 set_bit(CONN_SREJ_ACT, &chan->conn_state);
4620 chan->srej_save_reqseq = control->reqseq;
4621 }
4622 } else {
4623 l2cap_pass_to_tx_fbit(chan, control);
4624
4625 if (control->final) {
4626 if (chan->srej_save_reqseq != control->reqseq ||
4627 !test_and_clear_bit(CONN_SREJ_ACT,
4628 &chan->conn_state))
4629 l2cap_retransmit(chan, control);
4630 } else {
4631 l2cap_retransmit(chan, control);
4632 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
4633 set_bit(CONN_SREJ_ACT, &chan->conn_state);
4634 chan->srej_save_reqseq = control->reqseq;
4635 }
4636 }
4637 }
d2a7ac5d
MM		 4638}
4639
4640static void l2cap_handle_rej(struct l2cap_chan *chan,
4641 struct l2cap_ctrl *control)
4642{
fcd289df
MM		 4643 struct sk_buff *skb;
4644
4645 BT_DBG("chan %p, control %p", chan, control);
4646
4647 if (control->reqseq == chan->next_tx_seq) {
4648 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
4649 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4650 return;
4651 }
4652
4653 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
4654
4655 if (chan->max_tx && skb &&
4656 bt_cb(skb)->control.retries >= chan->max_tx) {
4657 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
4658 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4659 return;
4660 }
4661
4662 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4663
4664 l2cap_pass_to_tx(chan, control);
4665
4666 if (control->final) {
4667 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
4668 l2cap_retransmit_all(chan, control);
4669 } else {
4670 l2cap_retransmit_all(chan, control);
4671 l2cap_ertm_send(chan);
4672 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
4673 set_bit(CONN_REJ_ACT, &chan->conn_state);
4674 }
d2a7ac5d
MM		 4675}
4676
4b51dae9
MM		 4677static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
4678{
4679 BT_DBG("chan %p, txseq %d", chan, txseq);
4680
4681 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
4682 chan->expected_tx_seq);
4683
4684 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
4685 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
4686 chan->tx_win) {
4687 /* See notes below regarding "double poll" and
4688 * invalid packets.
4689 */
4690 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
4691 BT_DBG("Invalid/Ignore - after SREJ");
4692 return L2CAP_TXSEQ_INVALID_IGNORE;
4693 } else {
4694 BT_DBG("Invalid - in window after SREJ sent");
4695 return L2CAP_TXSEQ_INVALID;
4696 }
4697 }
4698
4699 if (chan->srej_list.head == txseq) {
4700 BT_DBG("Expected SREJ");
4701 return L2CAP_TXSEQ_EXPECTED_SREJ;
4702 }
4703
4704 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
4705 BT_DBG("Duplicate SREJ - txseq already stored");
4706 return L2CAP_TXSEQ_DUPLICATE_SREJ;
4707 }
4708
4709 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
4710 BT_DBG("Unexpected SREJ - not requested");
4711 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
4712 }
4713 }
4714
4715 if (chan->expected_tx_seq == txseq) {
4716 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
4717 chan->tx_win) {
4718 BT_DBG("Invalid - txseq outside tx window");
4719 return L2CAP_TXSEQ_INVALID;
4720 } else {
4721 BT_DBG("Expected");
4722 return L2CAP_TXSEQ_EXPECTED;
4723 }
4724 }
4725
4726 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
4727 __seq_offset(chan, chan->expected_tx_seq,
4728 chan->last_acked_seq)){
4729 BT_DBG("Duplicate - expected_tx_seq later than txseq");
4730 return L2CAP_TXSEQ_DUPLICATE;
4731 }
4732
4733 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
4734 /* A source of invalid packets is a "double poll" condition,
4735 * where delays cause us to send multiple poll packets. If
4736 * the remote stack receives and processes both polls,
4737 * sequence numbers can wrap around in such a way that a
4738 * resent frame has a sequence number that looks like new data
4739 * with a sequence gap. This would trigger an erroneous SREJ
4740 * request.
4741 *
4742 * Fortunately, this is impossible with a tx window that's
4743 * less than half of the maximum sequence number, which allows
4744 * invalid frames to be safely ignored.
4745 *
4746 * With tx window sizes greater than half of the tx window
4747 * maximum, the frame is invalid and cannot be ignored. This
4748 * causes a disconnect.
4749 */
4750
4751 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
4752 BT_DBG("Invalid/Ignore - txseq outside tx window");
4753 return L2CAP_TXSEQ_INVALID_IGNORE;
4754 } else {
4755 BT_DBG("Invalid - txseq outside tx window");
4756 return L2CAP_TXSEQ_INVALID;
4757 }
4758 } else {
4759 BT_DBG("Unexpected - txseq indicates missing frames");
4760 return L2CAP_TXSEQ_UNEXPECTED;
4761 }
4762}
4763
d2a7ac5d
MM		 4764static int l2cap_rx_state_recv(struct l2cap_chan *chan,
4765 struct l2cap_ctrl *control,
4766 struct sk_buff *skb, u8 event)
4767{
4768 int err = 0;
4769 bool skb_in_use = 0;
4770
4771 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
4772 event);
4773
4774 switch (event) {
4775 case L2CAP_EV_RECV_IFRAME:
4776 switch (l2cap_classify_txseq(chan, control->txseq)) {
4777 case L2CAP_TXSEQ_EXPECTED:
4778 l2cap_pass_to_tx(chan, control);
4779
4780 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4781 BT_DBG("Busy, discarding expected seq %d",
4782 control->txseq);
4783 break;
4784 }
4785
4786 chan->expected_tx_seq = __next_seq(chan,
4787 control->txseq);
4788
4789 chan->buffer_seq = chan->expected_tx_seq;
4790 skb_in_use = 1;
4791
4792 err = l2cap_reassemble_sdu(chan, skb, control);
4793 if (err)
4794 break;
4795
4796 if (control->final) {
4797 if (!test_and_clear_bit(CONN_REJ_ACT,
4798 &chan->conn_state)) {
4799 control->final = 0;
4800 l2cap_retransmit_all(chan, control);
4801 l2cap_ertm_send(chan);
4802 }
4803 }
4804
4805 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
4806 l2cap_send_ack(chan);
4807 break;
4808 case L2CAP_TXSEQ_UNEXPECTED:
4809 l2cap_pass_to_tx(chan, control);
4810
4811 /* Can't issue SREJ frames in the local busy state.
4812 * Drop this frame, it will be seen as missing
4813 * when local busy is exited.
4814 */
4815 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4816 BT_DBG("Busy, discarding unexpected seq %d",
4817 control->txseq);
4818 break;
4819 }
4820
4821 /* There was a gap in the sequence, so an SREJ
4822 * must be sent for each missing frame. The
4823 * current frame is stored for later use.
4824 */
4825 skb_queue_tail(&chan->srej_q, skb);
4826 skb_in_use = 1;
4827 BT_DBG("Queued %p (queue len %d)", skb,
4828 skb_queue_len(&chan->srej_q));
4829
4830 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
4831 l2cap_seq_list_clear(&chan->srej_list);
4832 l2cap_send_srej(chan, control->txseq);
4833
4834 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
4835 break;
4836 case L2CAP_TXSEQ_DUPLICATE:
4837 l2cap_pass_to_tx(chan, control);
4838 break;
4839 case L2CAP_TXSEQ_INVALID_IGNORE:
4840 break;
4841 case L2CAP_TXSEQ_INVALID:
4842 default:
4843 l2cap_send_disconn_req(chan->conn, chan,
4844 ECONNRESET);
4845 break;
4846 }
4847 break;
4848 case L2CAP_EV_RECV_RR:
4849 l2cap_pass_to_tx(chan, control);
4850 if (control->final) {
4851 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4852
4853 if (!test_and_clear_bit(CONN_REJ_ACT,
4854 &chan->conn_state)) {
4855 control->final = 0;
4856 l2cap_retransmit_all(chan, control);
4857 }
4858
4859 l2cap_ertm_send(chan);
4860 } else if (control->poll) {
4861 l2cap_send_i_or_rr_or_rnr(chan);
4862 } else {
4863 if (test_and_clear_bit(CONN_REMOTE_BUSY,
4864 &chan->conn_state) &&
4865 chan->unacked_frames)
4866 __set_retrans_timer(chan);
4867
4868 l2cap_ertm_send(chan);
4869 }
4870 break;
4871 case L2CAP_EV_RECV_RNR:
4872 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4873 l2cap_pass_to_tx(chan, control);
4874 if (control && control->poll) {
4875 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4876 l2cap_send_rr_or_rnr(chan, 0);
4877 }
4878 __clear_retrans_timer(chan);
4879 l2cap_seq_list_clear(&chan->retrans_list);
4880 break;
4881 case L2CAP_EV_RECV_REJ:
4882 l2cap_handle_rej(chan, control);
4883 break;
4884 case L2CAP_EV_RECV_SREJ:
4885 l2cap_handle_srej(chan, control);
4886 break;
4887 default:
4888 break;
4889 }
4890
4891 if (skb && !skb_in_use) {
4892 BT_DBG("Freeing %p", skb);
4893 kfree_skb(skb);
4894 }
4895
4896 return err;
4897}
4898
4899static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
4900 struct l2cap_ctrl *control,
4901 struct sk_buff *skb, u8 event)
4902{
4903 int err = 0;
4904 u16 txseq = control->txseq;
4905 bool skb_in_use = 0;
4906
4907 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
4908 event);
4909
4910 switch (event) {
4911 case L2CAP_EV_RECV_IFRAME:
4912 switch (l2cap_classify_txseq(chan, txseq)) {
4913 case L2CAP_TXSEQ_EXPECTED:
4914 /* Keep frame for reassembly later */
4915 l2cap_pass_to_tx(chan, control);
4916 skb_queue_tail(&chan->srej_q, skb);
4917 skb_in_use = 1;
4918 BT_DBG("Queued %p (queue len %d)", skb,
4919 skb_queue_len(&chan->srej_q));
4920
4921 chan->expected_tx_seq = __next_seq(chan, txseq);
4922 break;
4923 case L2CAP_TXSEQ_EXPECTED_SREJ:
4924 l2cap_seq_list_pop(&chan->srej_list);
4925
4926 l2cap_pass_to_tx(chan, control);
4927 skb_queue_tail(&chan->srej_q, skb);
4928 skb_in_use = 1;
4929 BT_DBG("Queued %p (queue len %d)", skb,
4930 skb_queue_len(&chan->srej_q));
4931
4932 err = l2cap_rx_queued_iframes(chan);
4933 if (err)
4934 break;
4935
4936 break;
4937 case L2CAP_TXSEQ_UNEXPECTED:
4938 /* Got a frame that can't be reassembled yet.
4939 * Save it for later, and send SREJs to cover
4940 * the missing frames.
4941 */
4942 skb_queue_tail(&chan->srej_q, skb);
4943 skb_in_use = 1;
4944 BT_DBG("Queued %p (queue len %d)", skb,
4945 skb_queue_len(&chan->srej_q));
4946
4947 l2cap_pass_to_tx(chan, control);
4948 l2cap_send_srej(chan, control->txseq);
4949 break;
4950 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
4951 /* This frame was requested with an SREJ, but
4952 * some expected retransmitted frames are
4953 * missing. Request retransmission of missing
4954 * SREJ'd frames.
4955 */
4956 skb_queue_tail(&chan->srej_q, skb);
4957 skb_in_use = 1;
4958 BT_DBG("Queued %p (queue len %d)", skb,
4959 skb_queue_len(&chan->srej_q));
4960
4961 l2cap_pass_to_tx(chan, control);
4962 l2cap_send_srej_list(chan, control->txseq);
4963 break;
4964 case L2CAP_TXSEQ_DUPLICATE_SREJ:
4965 /* We've already queued this frame. Drop this copy. */
4966 l2cap_pass_to_tx(chan, control);
4967 break;
4968 case L2CAP_TXSEQ_DUPLICATE:
4969 /* Expecting a later sequence number, so this frame
4970 * was already received. Ignore it completely.
4971 */
4972 break;
4973 case L2CAP_TXSEQ_INVALID_IGNORE:
4974 break;
4975 case L2CAP_TXSEQ_INVALID:
4976 default:
4977 l2cap_send_disconn_req(chan->conn, chan,
4978 ECONNRESET);
4979 break;
4980 }
4981 break;
4982 case L2CAP_EV_RECV_RR:
4983 l2cap_pass_to_tx(chan, control);
4984 if (control->final) {
4985 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4986
4987 if (!test_and_clear_bit(CONN_REJ_ACT,
4988 &chan->conn_state)) {
4989 control->final = 0;
4990 l2cap_retransmit_all(chan, control);
4991 }
4992
4993 l2cap_ertm_send(chan);
4994 } else if (control->poll) {
4995 if (test_and_clear_bit(CONN_REMOTE_BUSY,
4996 &chan->conn_state) &&
4997 chan->unacked_frames) {
4998 __set_retrans_timer(chan);
4999 }
5000
5001 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5002 l2cap_send_srej_tail(chan);
5003 } else {
5004 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5005 &chan->conn_state) &&
5006 chan->unacked_frames)
5007 __set_retrans_timer(chan);
5008
5009 l2cap_send_ack(chan);
5010 }
5011 break;
5012 case L2CAP_EV_RECV_RNR:
5013 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5014 l2cap_pass_to_tx(chan, control);
5015 if (control->poll) {
5016 l2cap_send_srej_tail(chan);
5017 } else {
5018 struct l2cap_ctrl rr_control;
5019 memset(&rr_control, 0, sizeof(rr_control));
5020 rr_control.sframe = 1;
5021 rr_control.super = L2CAP_SUPER_RR;
5022 rr_control.reqseq = chan->buffer_seq;
5023 l2cap_send_sframe(chan, &rr_control);
5024 }
5025
5026 break;
5027 case L2CAP_EV_RECV_REJ:
5028 l2cap_handle_rej(chan, control);
5029 break;
5030 case L2CAP_EV_RECV_SREJ:
5031 l2cap_handle_srej(chan, control);
5032 break;
5033 }
5034
5035 if (skb && !skb_in_use) {
5036 BT_DBG("Freeing %p", skb);
5037 kfree_skb(skb);
5038 }
5039
5040 return err;
5041}
5042
5043static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
5044{
5045 /* Make sure reqseq is for a packet that has been sent but not acked */
5046 u16 unacked;
5047
5048 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
5049 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
5050}
5051
cec8ab6e
MM		 5052static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5053 struct sk_buff *skb, u8 event)
218bb9df 5054{
d2a7ac5d
MM		 5055 int err = 0;
5056
5057 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
5058 control, skb, event, chan->rx_state);
5059
5060 if (__valid_reqseq(chan, control->reqseq)) {
5061 switch (chan->rx_state) {
5062 case L2CAP_RX_STATE_RECV:
5063 err = l2cap_rx_state_recv(chan, control, skb, event);
5064 break;
5065 case L2CAP_RX_STATE_SREJ_SENT:
5066 err = l2cap_rx_state_srej_sent(chan, control, skb,
5067 event);
5068 break;
5069 default:
5070 /* shut it down */
5071 break;
5072 }
5073 } else {
5074 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
5075 control->reqseq, chan->next_tx_seq,
5076 chan->expected_ack_seq);
5077 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
5078 }
5079
5080 return err;
cec8ab6e
MM		 5081}
5082
5083static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5084 struct sk_buff *skb)
5085{
4b51dae9
MM		 5086 int err = 0;
5087
5088 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
5089 chan->rx_state);
5090
5091 if (l2cap_classify_txseq(chan, control->txseq) ==
5092 L2CAP_TXSEQ_EXPECTED) {
5093 l2cap_pass_to_tx(chan, control);
5094
5095 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
5096 __next_seq(chan, chan->buffer_seq));
5097
5098 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5099
5100 l2cap_reassemble_sdu(chan, skb, control);
5101 } else {
5102 if (chan->sdu) {
5103 kfree_skb(chan->sdu);
5104 chan->sdu = NULL;
5105 }
5106 chan->sdu_last_frag = NULL;
5107 chan->sdu_len = 0;
5108
5109 if (skb) {
5110 BT_DBG("Freeing %p", skb);
5111 kfree_skb(skb);
5112 }
5113 }
5114
5115 chan->last_acked_seq = control->txseq;
5116 chan->expected_tx_seq = __next_seq(chan, control->txseq);
5117
5118 return err;
cec8ab6e
MM		 5119}
5120
5121static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
5122{
5123 struct l2cap_ctrl *control = &bt_cb(skb)->control;
5124 u16 len;
5125 u8 event;
218bb9df 5126
b76bbd66
MM		 5127 __unpack_control(chan, skb);
5128
218bb9df
GP		 5129 len = skb->len;
5130
5131 /*
5132 * We can just drop the corrupted I-frame here.
5133 * Receiver will miss it and start proper recovery
cec8ab6e 5134 * procedures and ask for retransmission.
218bb9df 5135 */
47d1ec61 5136 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 5137 goto drop;
5138
cec8ab6e 5139 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 5140 len -= L2CAP_SDULEN_SIZE;
218bb9df 5141
47d1ec61 5142 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 5143 len -= L2CAP_FCS_SIZE;
218bb9df 5144
47d1ec61 5145 if (len > chan->mps) {
8c1d787b 5146 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5147 goto drop;
5148 }
5149
cec8ab6e
MM		 5150 if (!control->sframe) {
5151 int err;
218bb9df 5152
cec8ab6e
MM		 5153 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
5154 control->sar, control->reqseq, control->final,
5155 control->txseq);
218bb9df 5156
cec8ab6e
MM		 5157 /* Validate F-bit - F=0 always valid, F=1 only
5158 * valid in TX WAIT_F
5159 */
5160 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 5161 goto drop;
cec8ab6e
MM		 5162
5163 if (chan->mode != L2CAP_MODE_STREAMING) {
5164 event = L2CAP_EV_RECV_IFRAME;
5165 err = l2cap_rx(chan, control, skb, event);
5166 } else {
5167 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 5168 }
5169
cec8ab6e
MM		 5170 if (err)
5171 l2cap_send_disconn_req(chan->conn, chan,
5172 ECONNRESET);
218bb9df 5173 } else {
cec8ab6e
MM		 5174 const u8 rx_func_to_event[4] = {
5175 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
5176 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
5177 };
5178
5179 /* Only I-frames are expected in streaming mode */
5180 if (chan->mode == L2CAP_MODE_STREAMING)
5181 goto drop;
5182
5183 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
5184 control->reqseq, control->final, control->poll,
5185 control->super);
5186
218bb9df
GP		 5187 if (len != 0) {
5188 BT_ERR("%d", len);
8c1d787b 5189 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5190 goto drop;
5191 }
5192
cec8ab6e
MM		 5193 /* Validate F and P bits */
5194 if (control->final && (control->poll ||
5195 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
5196 goto drop;
5197
5198 event = rx_func_to_event[control->super];
5199 if (l2cap_rx(chan, control, skb, event))
5200 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5201 }
5202
5203 return 0;
5204
5205drop:
5206 kfree_skb(skb);
5207 return 0;
5208}
5209
1da177e4
LT		 5210static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
5211{
48454079 5212 struct l2cap_chan *chan;
1da177e4 5213
baa7e1fa 5214 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 5215 if (!chan) {
1da177e4 5216 BT_DBG("unknown cid 0x%4.4x", cid);
6be36555 5217 /* Drop packet and return */
3379013b 5218 kfree_skb(skb);
6be36555 5219 return 0;
1da177e4
LT		 5220 }
5221
49208c9c 5222 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 5223
89bc500e 5224 if (chan->state != BT_CONNECTED)
1da177e4
LT		 5225 goto drop;
5226
0c1bc5c6 5227 switch (chan->mode) {
1c2acffb
GP		 5228 case L2CAP_MODE_BASIC:
5229 /* If socket recv buffers overflows we drop data here
5230 * which is *bad* because L2CAP has to be reliable.
5231 * But we don't have any other choice. L2CAP doesn't
5232 * provide flow control mechanism. */
1da177e4 5233
0c1bc5c6 5234 if (chan->imtu < skb->len)
1c2acffb 5235 goto drop;
1da177e4 5236
23070494 5237 if (!chan->ops->recv(chan->data, skb))
1c2acffb
GP		 5238 goto done;
5239 break;
5240
5241 case L2CAP_MODE_ERTM:
6840ed07 5242 case L2CAP_MODE_STREAMING:
cec8ab6e 5243 l2cap_data_rcv(chan, skb);
6840ed07
GP		 5244 goto done;
5245
1c2acffb 5246 default:
0c1bc5c6 5247 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 5248 break;
5249 }
1da177e4
LT		 5250
5251drop:
5252 kfree_skb(skb);
5253
5254done:
6be36555 5255 l2cap_chan_unlock(chan);
0139418c 5256
1da177e4
LT		 5257 return 0;
5258}
5259
8e036fc3 5260static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4 5261{
23691d75 5262 struct l2cap_chan *chan;
1da177e4 5263
c2287681 5264 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 5265 if (!chan)
1da177e4
LT		 5266 goto drop;
5267
5b4cedaa 5268 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 5269
89bc500e 5270 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 5271 goto drop;
5272
e13e21dc 5273 if (chan->imtu < skb->len)
1da177e4
LT		 5274 goto drop;
5275
23070494 5276 if (!chan->ops->recv(chan->data, skb))
5b4cedaa 5277 return 0;
1da177e4
LT		 5278
5279drop:
5280 kfree_skb(skb);
5281
1da177e4
LT		 5282 return 0;
5283}
5284
d9b88702
AE		 5285static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid,
5286 struct sk_buff *skb)
9f69bda6 5287{
23691d75 5288 struct l2cap_chan *chan;
9f69bda6 5289
c2287681 5290 chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst);
23691d75 5291 if (!chan)
9f69bda6
GP		 5292 goto drop;
5293
5b4cedaa 5294 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 5295
89bc500e 5296 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 5297 goto drop;
5298
e13e21dc 5299 if (chan->imtu < skb->len)
9f69bda6
GP		 5300 goto drop;
5301
23070494 5302 if (!chan->ops->recv(chan->data, skb))
5b4cedaa 5303 return 0;
9f69bda6
GP		 5304
5305drop:
5306 kfree_skb(skb);
5307
9f69bda6
GP		 5308 return 0;
5309}
5310
1da177e4
LT		 5311static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
5312{
5313 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 5314 u16 cid, len;
5315 __le16 psm;
1da177e4
LT		 5316
5317 skb_pull(skb, L2CAP_HDR_SIZE);
5318 cid = __le16_to_cpu(lh->cid);
5319 len = __le16_to_cpu(lh->len);
5320
1c2acffb
GP		 5321 if (len != skb->len) {
5322 kfree_skb(skb);
5323 return;
5324 }
5325
1da177e4
LT		 5326 BT_DBG("len %d, cid 0x%4.4x", len, cid);
5327
5328 switch (cid) {
3300d9a9 5329 case L2CAP_CID_LE_SIGNALING:
8db4dc46 5330 case L2CAP_CID_SIGNALING:
1da177e4
LT		 5331 l2cap_sig_channel(conn, skb);
5332 break;
5333
8db4dc46 5334 case L2CAP_CID_CONN_LESS:
097db76c 5335 psm = get_unaligned((__le16 *) skb->data);
1da177e4
LT		 5336 skb_pull(skb, 2);
5337 l2cap_conless_channel(conn, psm, skb);
5338 break;
5339
9f69bda6
GP		 5340 case L2CAP_CID_LE_DATA:
5341 l2cap_att_channel(conn, cid, skb);
5342 break;
5343
b501d6a1
AB		 5344 case L2CAP_CID_SMP:
5345 if (smp_sig_channel(conn, skb))
5346 l2cap_conn_del(conn->hcon, EACCES);
5347 break;
5348
1da177e4
LT		 5349 default:
5350 l2cap_data_channel(conn, cid, skb);
5351 break;
5352 }
5353}
5354
5355/* ---- L2CAP interface with lower layer (HCI) ---- */
5356
686ebf28 5357int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 5358{
5359 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 5360 struct l2cap_chan *c;
1da177e4 5361
1da177e4
LT		 5362 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
5363
5364 /* Find listening sockets and check their link_mode */
23691d75
GP		 5365 read_lock(&chan_list_lock);
5366 list_for_each_entry(c, &chan_list, global_l) {
5367 struct sock *sk = c->sk;
4343478f 5368
89bc500e 5369 if (c->state != BT_LISTEN)
1da177e4
LT		 5370 continue;
5371
5372 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 5373 lm1 |= HCI_LM_ACCEPT;
43bd0f32 5374 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 5375 lm1 |= HCI_LM_MASTER;
1da177e4 5376 exact++;
2af6b9d5
MH		 5377 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
5378 lm2 |= HCI_LM_ACCEPT;
43bd0f32 5379 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 5380 lm2 |= HCI_LM_MASTER;
5381 }
1da177e4 5382 }
23691d75 5383 read_unlock(&chan_list_lock);
1da177e4
LT		 5384
5385 return exact ? lm1 : lm2;
5386}
5387
686ebf28 5388int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 5389{
0139418c
MH		 5390 struct l2cap_conn *conn;
5391
1da177e4
LT		 5392 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
5393
1da177e4 5394 if (!status) {
1da177e4
LT		 5395 conn = l2cap_conn_add(hcon, status);
5396 if (conn)
5397 l2cap_conn_ready(conn);
0139418c 5398 } else
e175072f 5399 l2cap_conn_del(hcon, bt_to_errno(status));
1da177e4
LT		 5400
5401 return 0;
5402}
5403
686ebf28 5404int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 5405{
5406 struct l2cap_conn *conn = hcon->l2cap_data;
5407
5408 BT_DBG("hcon %p", hcon);
5409
686ebf28 5410 if (!conn)
9f5a0d7b 5411 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 5412 return conn->disc_reason;
5413}
5414
686ebf28 5415int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 5416{
5417 BT_DBG("hcon %p reason %d", hcon, reason);
5418
e175072f 5419 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 5420 return 0;
5421}
5422
4343478f 5423static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 5424{
715ec005 5425 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 5426 return;
5427
f62e4323 5428 if (encrypt == 0x00) {
4343478f 5429 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 5430 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 5431 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 5432 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 5433 } else {
4343478f 5434 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 5435 __clear_chan_timer(chan);
f62e4323
MH		 5436 }
5437}
5438
686ebf28 5439int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 5440{
0139418c 5441 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 5442 struct l2cap_chan *chan;
1da177e4 5443
0139418c 5444 if (!conn)
1da177e4 5445 return 0;
0139418c 5446
1da177e4
LT		 5447 BT_DBG("conn %p", conn);
5448
160dc6ac 5449 if (hcon->type == LE_LINK) {
35d4adcc
HG		 5450 if (!status && encrypt)
5451 smp_distribute_keys(conn, 0);
17cd3f37 5452 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 5453 }
5454
3df91ea2 5455 mutex_lock(&conn->chan_lock);
1da177e4 5456
3df91ea2 5457 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 5458 l2cap_chan_lock(chan);
1da177e4 5459
f1cb9af5
VCG		 5460 BT_DBG("chan->scid %d", chan->scid);
5461
5462 if (chan->scid == L2CAP_CID_LE_DATA) {
5463 if (!status && encrypt) {
5464 chan->sec_level = hcon->sec_level;
cf4cd009 5465 l2cap_chan_ready(chan);
f1cb9af5
VCG		 5466 }
5467
6be36555 5468 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 5469 continue;
5470 }
5471
c1360a1c 5472 if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
6be36555 5473 l2cap_chan_unlock(chan);
6a8d3010
MH		 5474 continue;
5475 }
5476
89bc500e
GP		 5477 if (!status && (chan->state == BT_CONNECTED ||
5478 chan->state == BT_CONFIG)) {
a7d7723a
GP		 5479 struct sock *sk = chan->sk;
5480
c5daa683 5481 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
a7d7723a
GP		 5482 sk->sk_state_change(sk);
5483
4343478f 5484 l2cap_check_encryption(chan, encrypt);
6be36555 5485 l2cap_chan_unlock(chan);
9719f8af
MH		 5486 continue;
5487 }
5488
89bc500e 5489 if (chan->state == BT_CONNECT) {
b1235d79 5490 if (!status) {
9b27f350 5491 l2cap_send_conn_req(chan);
b1235d79 5492 } else {
ba13ccd9 5493 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 5494 }
89bc500e 5495 } else if (chan->state == BT_CONNECT2) {
6be36555 5496 struct sock *sk = chan->sk;
b1235d79 5497 struct l2cap_conn_rsp rsp;
df3c3931 5498 __u16 res, stat;
1da177e4 5499
6be36555
AE		 5500 lock_sock(sk);
5501
b1235d79 5502 if (!status) {
c5daa683
GP		 5503 if (test_bit(BT_SK_DEFER_SETUP,
5504 &bt_sk(sk)->flags)) {
df3c3931
JH		 5505 struct sock *parent = bt_sk(sk)->parent;
5506 res = L2CAP_CR_PEND;
5507 stat = L2CAP_CS_AUTHOR_PEND;
05e9a2f6
IK		 5508 if (parent)
5509 parent->sk_data_ready(parent, 0);
df3c3931 5510 } else {
0e587be7 5511 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 5512 res = L2CAP_CR_SUCCESS;
5513 stat = L2CAP_CS_NO_INFO;
5514 }
b1235d79 5515 } else {
0e587be7 5516 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 5517 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 5518 res = L2CAP_CR_SEC_BLOCK;
5519 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 5520 }
5521
6be36555
AE		 5522 release_sock(sk);
5523
fe4128e0
GP		 5524 rsp.scid = cpu_to_le16(chan->dcid);
5525 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 5526 rsp.result = cpu_to_le16(res);
5527 rsp.status = cpu_to_le16(stat);
fc7f8a7e
GP		 5528 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
5529 sizeof(rsp), &rsp);
b1235d79 5530 }
1da177e4 5531
6be36555 5532 l2cap_chan_unlock(chan);
1da177e4
LT		 5533 }
5534
3df91ea2 5535 mutex_unlock(&conn->chan_lock);
b1235d79 5536
1da177e4
LT		 5537 return 0;
5538}
5539
686ebf28 5540int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 5541{
5542 struct l2cap_conn *conn = hcon->l2cap_data;
5543
5a08ecce
AE		 5544 if (!conn)
5545 conn = l2cap_conn_add(hcon, 0);
5546
5547 if (!conn)
1da177e4
LT		 5548 goto drop;
5549
5550 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
5551
e702112f 5552 if (!(flags & ACL_CONT)) {
1da177e4
LT		 5553 struct l2cap_hdr *hdr;
5554 int len;
5555
5556 if (conn->rx_len) {
5557 BT_ERR("Unexpected start frame (len %d)", skb->len);
5558 kfree_skb(conn->rx_skb);
5559 conn->rx_skb = NULL;
5560 conn->rx_len = 0;
5561 l2cap_conn_unreliable(conn, ECOMM);
5562 }
5563
aae7fe22
AE		 5564 /* Start fragment always begin with Basic L2CAP header */
5565 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 5566 BT_ERR("Frame is too short (len %d)", skb->len);
5567 l2cap_conn_unreliable(conn, ECOMM);
5568 goto drop;
5569 }
5570
5571 hdr = (struct l2cap_hdr *) skb->data;
5572 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
5573
5574 if (len == skb->len) {
5575 /* Complete frame received */
5576 l2cap_recv_frame(conn, skb);
5577 return 0;
5578 }
5579
5580 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
5581
5582 if (skb->len > len) {
5583 BT_ERR("Frame is too long (len %d, expected len %d)",
5584 skb->len, len);
5585 l2cap_conn_unreliable(conn, ECOMM);
5586 goto drop;
5587 }
5588
5589 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 5590 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
5591 if (!conn->rx_skb)
1da177e4
LT		 5592 goto drop;
5593
d626f62b 5594 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 5595 skb->len);
1da177e4
LT		 5596 conn->rx_len = len - skb->len;
5597 } else {
5598 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
5599
5600 if (!conn->rx_len) {
5601 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
5602 l2cap_conn_unreliable(conn, ECOMM);
5603 goto drop;
5604 }
5605
5606 if (skb->len > conn->rx_len) {
5607 BT_ERR("Fragment is too long (len %d, expected %d)",
5608 skb->len, conn->rx_len);
5609 kfree_skb(conn->rx_skb);
5610 conn->rx_skb = NULL;
5611 conn->rx_len = 0;
5612 l2cap_conn_unreliable(conn, ECOMM);
5613 goto drop;
5614 }
5615
d626f62b 5616 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 5617 skb->len);
1da177e4
LT		 5618 conn->rx_len -= skb->len;
5619
5620 if (!conn->rx_len) {
5621 /* Complete frame received */
5622 l2cap_recv_frame(conn, conn->rx_skb);
5623 conn->rx_skb = NULL;
5624 }
5625 }
5626
5627drop:
5628 kfree_skb(skb);
5629 return 0;
5630}
5631
aef7d97c 5632static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 5633{
23691d75 5634 struct l2cap_chan *c;
1da177e4 5635
333055f2 5636 read_lock(&chan_list_lock);
1da177e4 5637
23691d75
GP		 5638 list_for_each_entry(c, &chan_list, global_l) {
5639 struct sock *sk = c->sk;
101545f6 5640
903d343e 5641 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
aef7d97c
MH		 5642 batostr(&bt_sk(sk)->src),
5643 batostr(&bt_sk(sk)->dst),
89bc500e 5644 c->state, __le16_to_cpu(c->psm),
23691d75
GP		 5645 c->scid, c->dcid, c->imtu, c->omtu,
5646 c->sec_level, c->mode);
61e1b4b7 5647 }
1da177e4 5648
333055f2 5649 read_unlock(&chan_list_lock);
1da177e4 5650
aef7d97c 5651 return 0;
1da177e4
LT		 5652}
5653
aef7d97c
MH		 5654static int l2cap_debugfs_open(struct inode *inode, struct file *file)
5655{
5656 return single_open(file, l2cap_debugfs_show, inode->i_private);
5657}
5658
5659static const struct file_operations l2cap_debugfs_fops = {
5660 .open = l2cap_debugfs_open,
5661 .read = seq_read,
5662 .llseek = seq_lseek,
5663 .release = single_release,
5664};
5665
5666static struct dentry *l2cap_debugfs;
1da177e4 5667
64274518 5668int __init l2cap_init(void)
1da177e4
LT		 5669{
5670 int err;
be9d1227 5671
bb58f747 5672 err = l2cap_init_sockets();
1da177e4
LT		 5673 if (err < 0)
5674 return err;
5675
aef7d97c
MH		 5676 if (bt_debugfs) {
5677 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
5678 bt_debugfs, NULL, &l2cap_debugfs_fops);
5679 if (!l2cap_debugfs)
5680 BT_ERR("Failed to create L2CAP debug file");
5681 }
1da177e4 5682
1da177e4 5683 return 0;
1da177e4
LT		 5684}
5685
64274518 5686void l2cap_exit(void)
1da177e4 5687{
aef7d97c 5688 debugfs_remove(l2cap_debugfs);
bb58f747 5689 l2cap_cleanup_sockets();
1da177e4
LT		 5690}
5691
d1c4a17d
GP		 5692module_param(disable_ertm, bool, 0644);
5693MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)