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Merge branch 'for-john' of git://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi...
[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
aef7d97c 33#include <linux/debugfs.h>
fcc203c3 34#include <linux/crc16.h>
1da177e4
LT		 35
36#include <net/bluetooth/bluetooth.h>
37#include <net/bluetooth/hci_core.h>
38#include <net/bluetooth/l2cap.h>
b501d6a1 39#include <net/bluetooth/smp.h>
97e8e89d 40#include <net/bluetooth/a2mp.h>
5ce66b59 41#include <net/bluetooth/amp.h>
1da177e4 42
d1de6d46 43bool disable_ertm;
f0709e03 44
47ec1dcd 45static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
50a147cd 46static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
1da177e4 47
b5ad8b7f
JB		 48static LIST_HEAD(chan_list);
49static DEFINE_RWLOCK(chan_list_lock);
1da177e4 50
1da177e4 51static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 52 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 53static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 54 void *data);
710f9b0a 55static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 56static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 57
d660366d 58static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 59 struct sk_buff_head *skbs, u8 event);
608bcc6d 60
0139418c 61/* ---- L2CAP channels ---- */
71ba0e56 62
2d792818
GP		 63static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
64 u16 cid)
0139418c 65{
3df91ea2 66 struct l2cap_chan *c;
3d57dc68 67
3df91ea2
AE		 68 list_for_each_entry(c, &conn->chan_l, list) {
69 if (c->dcid == cid)
70 return c;
0139418c 71 }
3df91ea2 72 return NULL;
0139418c
MH		 73}
74
2d792818
GP		 75static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
76 u16 cid)
0139418c 77{
3df91ea2 78 struct l2cap_chan *c;
3d57dc68 79
3df91ea2
AE		 80 list_for_each_entry(c, &conn->chan_l, list) {
81 if (c->scid == cid)
82 return c;
0139418c 83 }
3df91ea2 84 return NULL;
0139418c
MH		 85}
86
87/* Find channel with given SCID.
ef191ade 88 * Returns locked channel. */
2d792818
GP		 89static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
90 u16 cid)
0139418c 91{
48454079 92 struct l2cap_chan *c;
baa7e1fa 93
3df91ea2 94 mutex_lock(&conn->chan_lock);
baa7e1fa 95 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 96 if (c)
97 l2cap_chan_lock(c);
3df91ea2
AE		 98 mutex_unlock(&conn->chan_lock);
99
48454079 100 return c;
0139418c
MH		 101}
102
b1a130b7
MM		 103/* Find channel with given DCID.
104 * Returns locked channel.
105 */
106static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
107 u16 cid)
108{
109 struct l2cap_chan *c;
110
111 mutex_lock(&conn->chan_lock);
112 c = __l2cap_get_chan_by_dcid(conn, cid);
113 if (c)
114 l2cap_chan_lock(c);
115 mutex_unlock(&conn->chan_lock);
116
117 return c;
118}
119
2d792818
GP		 120static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
121 u8 ident)
0139418c 122{
3df91ea2 123 struct l2cap_chan *c;
3d57dc68 124
3df91ea2
AE		 125 list_for_each_entry(c, &conn->chan_l, list) {
126 if (c->ident == ident)
127 return c;
0139418c 128 }
3df91ea2 129 return NULL;
0139418c
MH		 130}
131
5b155ef9
MM		 132static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
133 u8 ident)
134{
135 struct l2cap_chan *c;
136
137 mutex_lock(&conn->chan_lock);
138 c = __l2cap_get_chan_by_ident(conn, ident);
139 if (c)
140 l2cap_chan_lock(c);
141 mutex_unlock(&conn->chan_lock);
142
143 return c;
144}
145
23691d75 146static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 147{
23691d75 148 struct l2cap_chan *c;
9e4425ff 149
23691d75
GP		 150 list_for_each_entry(c, &chan_list, global_l) {
151 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
250938cb 152 return c;
9e4425ff 153 }
250938cb 154 return NULL;
9e4425ff
GP		 155}
156
157int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
158{
73b2ec18
GP		 159 int err;
160
333055f2 161 write_lock(&chan_list_lock);
9e4425ff 162
23691d75 163 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 164 err = -EADDRINUSE;
165 goto done;
9e4425ff
GP		 166 }
167
73b2ec18
GP		 168 if (psm) {
169 chan->psm = psm;
170 chan->sport = psm;
171 err = 0;
172 } else {
173 u16 p;
174
175 err = -EINVAL;
176 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 177 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 178 chan->psm = cpu_to_le16(p);
179 chan->sport = cpu_to_le16(p);
180 err = 0;
181 break;
182 }
183 }
9e4425ff 184
73b2ec18 185done:
333055f2 186 write_unlock(&chan_list_lock);
73b2ec18 187 return err;
9e4425ff
GP		 188}
189
190int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
191{
333055f2 192 write_lock(&chan_list_lock);
9e4425ff
GP		 193
194 chan->scid = scid;
195
333055f2 196 write_unlock(&chan_list_lock);
9e4425ff
GP		 197
198 return 0;
199}
200
baa7e1fa 201static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 202{
8db4dc46 203 u16 cid = L2CAP_CID_DYN_START;
0139418c 204
8db4dc46 205 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 206 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 207 return cid;
208 }
209
210 return 0;
211}
212
0e587be7 213static void __l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 214{
42d2d87c 215 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 216 state_to_string(state));
badaaa00 217
89bc500e 218 chan->state = state;
80b98027 219 chan->ops->state_change(chan, state);
89bc500e
GP		 220}
221
0e587be7
AE		 222static void l2cap_state_change(struct l2cap_chan *chan, int state)
223{
224 struct sock *sk = chan->sk;
225
226 lock_sock(sk);
227 __l2cap_state_change(chan, state);
228 release_sock(sk);
229}
230
2e0052e4
AE		 231static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err)
232{
233 struct sock *sk = chan->sk;
234
235 sk->sk_err = err;
236}
237
238static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
239{
240 struct sock *sk = chan->sk;
241
242 lock_sock(sk);
243 __l2cap_chan_set_err(chan, err);
244 release_sock(sk);
245}
246
4239d16f
MM		 247static void __set_retrans_timer(struct l2cap_chan *chan)
248{
249 if (!delayed_work_pending(&chan->monitor_timer) &&
250 chan->retrans_timeout) {
251 l2cap_set_timer(chan, &chan->retrans_timer,
252 msecs_to_jiffies(chan->retrans_timeout));
253 }
254}
255
256static void __set_monitor_timer(struct l2cap_chan *chan)
257{
258 __clear_retrans_timer(chan);
259 if (chan->monitor_timeout) {
260 l2cap_set_timer(chan, &chan->monitor_timer,
261 msecs_to_jiffies(chan->monitor_timeout));
262 }
263}
264
608bcc6d
MM		 265static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
266 u16 seq)
267{
268 struct sk_buff *skb;
269
270 skb_queue_walk(head, skb) {
271 if (bt_cb(skb)->control.txseq == seq)
272 return skb;
273 }
274
275 return NULL;
276}
277
3c588192
MM		 278/* ---- L2CAP sequence number lists ---- */
279
280/* For ERTM, ordered lists of sequence numbers must be tracked for
281 * SREJ requests that are received and for frames that are to be
282 * retransmitted. These seq_list functions implement a singly-linked
283 * list in an array, where membership in the list can also be checked
284 * in constant time. Items can also be added to the tail of the list
285 * and removed from the head in constant time, without further memory
286 * allocs or frees.
287 */
288
289static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
290{
291 size_t alloc_size, i;
292
293 /* Allocated size is a power of 2 to map sequence numbers
294 * (which may be up to 14 bits) in to a smaller array that is
295 * sized for the negotiated ERTM transmit windows.
296 */
297 alloc_size = roundup_pow_of_two(size);
298
299 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
300 if (!seq_list->list)
301 return -ENOMEM;
302
303 seq_list->mask = alloc_size - 1;
304 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
305 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
306 for (i = 0; i < alloc_size; i++)
307 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
308
309 return 0;
310}
311
312static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
313{
314 kfree(seq_list->list);
315}
316
317static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
318 u16 seq)
319{
320 /* Constant-time check for list membership */
321 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
322}
323
324static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
325{
326 u16 mask = seq_list->mask;
327
328 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
329 /* In case someone tries to pop the head of an empty list */
330 return L2CAP_SEQ_LIST_CLEAR;
331 } else if (seq_list->head == seq) {
332 /* Head can be removed in constant time */
333 seq_list->head = seq_list->list[seq & mask];
334 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
335
336 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
337 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
338 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
339 }
340 } else {
341 /* Walk the list to find the sequence number */
342 u16 prev = seq_list->head;
343 while (seq_list->list[prev & mask] != seq) {
344 prev = seq_list->list[prev & mask];
345 if (prev == L2CAP_SEQ_LIST_TAIL)
346 return L2CAP_SEQ_LIST_CLEAR;
347 }
348
349 /* Unlink the number from the list and clear it */
350 seq_list->list[prev & mask] = seq_list->list[seq & mask];
351 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
352 if (seq_list->tail == seq)
353 seq_list->tail = prev;
354 }
355 return seq;
356}
357
358static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
359{
360 /* Remove the head in constant time */
361 return l2cap_seq_list_remove(seq_list, seq_list->head);
362}
363
364static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
365{
f522ae36 366 u16 i;
3c588192 367
f522ae36
GP		 368 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
369 return;
370
371 for (i = 0; i <= seq_list->mask; i++)
372 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
373
374 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
375 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 376}
377
378static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
379{
380 u16 mask = seq_list->mask;
381
382 /* All appends happen in constant time */
383
f522ae36
GP		 384 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
385 return;
3c588192 386
f522ae36
GP		 387 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
388 seq_list->head = seq;
389 else
390 seq_list->list[seq_list->tail & mask] = seq;
391
392 seq_list->tail = seq;
393 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 394}
395
721c4181 396static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 397{
721c4181 398 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 399 chan_timer.work);
3df91ea2 400 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 401 int reason;
402
e05dcc32 403 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 404
3df91ea2 405 mutex_lock(&conn->chan_lock);
6be36555 406 l2cap_chan_lock(chan);
ab07801d 407
89bc500e 408 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 409 reason = ECONNREFUSED;
89bc500e 410 else if (chan->state == BT_CONNECT &&
2d792818 411 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 412 reason = ECONNREFUSED;
413 else
414 reason = ETIMEDOUT;
415
0f852724 416 l2cap_chan_close(chan, reason);
ab07801d 417
6be36555 418 l2cap_chan_unlock(chan);
ab07801d 419
80b98027 420 chan->ops->close(chan);
3df91ea2
AE		 421 mutex_unlock(&conn->chan_lock);
422
371fd835 423 l2cap_chan_put(chan);
ab07801d
GP		 424}
425
eef1d9b6 426struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 427{
428 struct l2cap_chan *chan;
429
430 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
431 if (!chan)
432 return NULL;
433
c03b355e
AE		 434 mutex_init(&chan->lock);
435
333055f2 436 write_lock(&chan_list_lock);
23691d75 437 list_add(&chan->global_l, &chan_list);
333055f2 438 write_unlock(&chan_list_lock);
23691d75 439
721c4181 440 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 441
89bc500e
GP		 442 chan->state = BT_OPEN;
443
144ad330 444 kref_init(&chan->kref);
71ba0e56 445
2827011f
MM		 446 /* This flag is cleared in l2cap_chan_ready() */
447 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
448
eef1d9b6 449 BT_DBG("chan %p", chan);
abc545b8 450
48454079
GP		 451 return chan;
452}
453
144ad330 454static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 455{
144ad330
SS		 456 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
457
4af66c69
JK		 458 BT_DBG("chan %p", chan);
459
333055f2 460 write_lock(&chan_list_lock);
23691d75 461 list_del(&chan->global_l);
333055f2 462 write_unlock(&chan_list_lock);
23691d75 463
4af66c69 464 kfree(chan);
6ff5abbf
GP		 465}
466
30648372
JK		 467void l2cap_chan_hold(struct l2cap_chan *c)
468{
144ad330 469 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 470
144ad330 471 kref_get(&c->kref);
30648372
JK		 472}
473
474void l2cap_chan_put(struct l2cap_chan *c)
475{
144ad330 476 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 477
144ad330 478 kref_put(&c->kref, l2cap_chan_destroy);
30648372
JK		 479}
480
bd4b1653
AE		 481void l2cap_chan_set_defaults(struct l2cap_chan *chan)
482{
483 chan->fcs = L2CAP_FCS_CRC16;
484 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
485 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
486 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
c20f8e35 487 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653
AE		 488 chan->sec_level = BT_SECURITY_LOW;
489
490 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
491}
492
93c3e8f5 493void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 494{
af05b30b 495 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 496 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 497
9f5a0d7b 498 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 499
8c1d787b 500 chan->conn = conn;
0139418c 501
5491120e
AE		 502 switch (chan->chan_type) {
503 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b
VT		 504 if (conn->hcon->type == LE_LINK) {
505 /* LE connection */
6fcb06a2 506 chan->omtu = L2CAP_DEFAULT_MTU;
fe4128e0
GP		 507 chan->scid = L2CAP_CID_LE_DATA;
508 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 509 } else {
510 /* Alloc CID for connection-oriented socket */
fe4128e0 511 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 512 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 513 }
5491120e
AE		 514 break;
515
516 case L2CAP_CHAN_CONN_LESS:
0139418c 517 /* Connectionless socket */
fe4128e0
GP		 518 chan->scid = L2CAP_CID_CONN_LESS;
519 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 520 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 521 break;
522
416fa752
AE		 523 case L2CAP_CHAN_CONN_FIX_A2MP:
524 chan->scid = L2CAP_CID_A2MP;
525 chan->dcid = L2CAP_CID_A2MP;
526 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
527 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
528 break;
529
5491120e 530 default:
0139418c 531 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 532 chan->scid = L2CAP_CID_SIGNALING;
533 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 534 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 535 }
536
8f7975b1
AE		 537 chan->local_id = L2CAP_BESTEFFORT_ID;
538 chan->local_stype = L2CAP_SERV_BESTEFFORT;
539 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
540 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
541 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 542 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 543
371fd835 544 l2cap_chan_hold(chan);
baa7e1fa 545
3df91ea2 546 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 547}
548
466f8004 549void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 550{
551 mutex_lock(&conn->chan_lock);
552 __l2cap_chan_add(conn, chan);
3df91ea2 553 mutex_unlock(&conn->chan_lock);
0139418c
MH		 554}
555
466f8004 556void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 557{
8c1d787b 558 struct l2cap_conn *conn = chan->conn;
0139418c 559
c9b66675 560 __clear_chan_timer(chan);
0139418c 561
49208c9c 562 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 563
8e87d142 564 if (conn) {
56f60984 565 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 566 /* Delete from channel list */
3df91ea2 567 list_del(&chan->list);
3d57dc68 568
371fd835 569 l2cap_chan_put(chan);
baa7e1fa 570
8c1d787b 571 chan->conn = NULL;
3cabbfda
AE		 572
573 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
76a68ba0 574 hci_conn_drop(conn->hcon);
56f60984
AE		 575
576 if (mgr && mgr->bredr_chan == chan)
577 mgr->bredr_chan = NULL;
0139418c
MH		 578 }
579
419e08c1
AE		 580 if (chan->hs_hchan) {
581 struct hci_chan *hs_hchan = chan->hs_hchan;
582
583 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
584 amp_disconnect_logical_link(hs_hchan);
585 }
586
b699ec0d 587 chan->ops->teardown(chan, err);
6be36555 588
2827011f 589 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 590 return;
2ead70b8 591
ee556f66
GP		 592 switch(chan->mode) {
593 case L2CAP_MODE_BASIC:
594 break;
c13ffa62 595
ee556f66 596 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 597 __clear_retrans_timer(chan);
598 __clear_monitor_timer(chan);
599 __clear_ack_timer(chan);
c13ffa62 600
f1c6775b 601 skb_queue_purge(&chan->srej_q);
c13ffa62 602
3c588192
MM		 603 l2cap_seq_list_free(&chan->srej_list);
604 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 605
606 /* fall through */
607
608 case L2CAP_MODE_STREAMING:
609 skb_queue_purge(&chan->tx_q);
610 break;
c13ffa62 611 }
ee556f66
GP		 612
613 return;
0139418c
MH		 614}
615
0f852724 616void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 617{
618 struct l2cap_conn *conn = chan->conn;
619 struct sock *sk = chan->sk;
620
2d792818
GP		 621 BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state),
622 sk);
4519de9a 623
89bc500e 624 switch (chan->state) {
4519de9a 625 case BT_LISTEN:
b699ec0d 626 chan->ops->teardown(chan, 0);
4519de9a
GP		 627 break;
628
629 case BT_CONNECTED:
630 case BT_CONFIG:
715ec005 631 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 632 conn->hcon->type == ACL_LINK) {
c9b66675 633 __set_chan_timer(chan, sk->sk_sndtimeo);
5e4e3972 634 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 635 } else
636 l2cap_chan_del(chan, reason);
637 break;
638
639 case BT_CONNECT2:
715ec005 640 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 641 conn->hcon->type == ACL_LINK) {
4519de9a
GP		 642 struct l2cap_conn_rsp rsp;
643 __u16 result;
644
c5daa683 645 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
4519de9a
GP		 646 result = L2CAP_CR_SEC_BLOCK;
647 else
648 result = L2CAP_CR_BAD_PSM;
89bc500e 649 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 650
651 rsp.scid = cpu_to_le16(chan->dcid);
652 rsp.dcid = cpu_to_le16(chan->scid);
653 rsp.result = cpu_to_le16(result);
ac73498c 654 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4519de9a 655 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 656 sizeof(rsp), &rsp);
4519de9a
GP		 657 }
658
659 l2cap_chan_del(chan, reason);
660 break;
661
662 case BT_CONNECT:
663 case BT_DISCONN:
664 l2cap_chan_del(chan, reason);
665 break;
666
667 default:
b699ec0d 668 chan->ops->teardown(chan, 0);
4519de9a
GP		 669 break;
670 }
671}
672
4343478f 673static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 674{
715ec005 675 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 676 switch (chan->sec_level) {
8556edd3
JH		 677 case BT_SECURITY_HIGH:
678 return HCI_AT_DEDICATED_BONDING_MITM;
679 case BT_SECURITY_MEDIUM:
680 return HCI_AT_DEDICATED_BONDING;
681 default:
682 return HCI_AT_NO_BONDING;
683 }
2983fd68 684 } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
4343478f
GP		 685 if (chan->sec_level == BT_SECURITY_LOW)
686 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 687
4343478f 688 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 689 return HCI_AT_NO_BONDING_MITM;
00ae4af9 690 else
8556edd3 691 return HCI_AT_NO_BONDING;
00ae4af9 692 } else {
4343478f 693 switch (chan->sec_level) {
00ae4af9 694 case BT_SECURITY_HIGH:
8556edd3 695 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 696 case BT_SECURITY_MEDIUM:
8556edd3 697 return HCI_AT_GENERAL_BONDING;
00ae4af9 698 default:
8556edd3 699 return HCI_AT_NO_BONDING;
00ae4af9 700 }
0684e5f9 701 }
8556edd3
JH		 702}
703
704/* Service level security */
d45fc423 705int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 706{
8c1d787b 707 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 708 __u8 auth_type;
709
4343478f 710 auth_type = l2cap_get_auth_type(chan);
79d554a6 711
4343478f 712 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 713}
714
b5ad8b7f 715static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 716{
717 u8 id;
718
719 /* Get next available identificator.
720 * 1 - 128 are used by kernel.
721 * 129 - 199 are reserved.
722 * 200 - 254 are used by utilities like l2ping, etc.
723 */
724
333055f2 725 spin_lock(&conn->lock);
4e8402a3
MH		 726
727 if (++conn->tx_ident > 128)
728 conn->tx_ident = 1;
729
730 id = conn->tx_ident;
731
333055f2 732 spin_unlock(&conn->lock);
4e8402a3
MH		 733
734 return id;
735}
736
2d792818
GP		 737static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
738 void *data)
4e8402a3
MH		 739{
740 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 741 u8 flags;
4e8402a3
MH		 742
743 BT_DBG("code 0x%2.2x", code);
744
745 if (!skb)
9a9c6a34 746 return;
4e8402a3 747
e702112f
AE		 748 if (lmp_no_flush_capable(conn->hcon->hdev))
749 flags = ACL_START_NO_FLUSH;
750 else
751 flags = ACL_START;
752
14b12d0b 753 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 754 skb->priority = HCI_PRIO_MAX;
14b12d0b 755
73d80deb
LAD		 756 hci_send_acl(conn->hchan, skb, flags);
757}
758
02b0fbb9
MM		 759static bool __chan_is_moving(struct l2cap_chan *chan)
760{
761 return chan->move_state != L2CAP_MOVE_STABLE &&
762 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
763}
764
73d80deb
LAD		 765static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
766{
767 struct hci_conn *hcon = chan->conn->hcon;
768 u16 flags;
769
770 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 771 skb->priority);
73d80deb 772
d5f8a75d
MM		 773 if (chan->hs_hcon && !__chan_is_moving(chan)) {
774 if (chan->hs_hchan)
775 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
776 else
777 kfree_skb(skb);
778
779 return;
780 }
781
73d80deb 782 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 783 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 784 flags = ACL_START_NO_FLUSH;
785 else
786 flags = ACL_START;
14b12d0b 787
73d80deb
LAD		 788 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
789 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 790}
791
b76bbd66
MM		 792static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
793{
794 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
795 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
796
797 if (enh & L2CAP_CTRL_FRAME_TYPE) {
798 /* S-Frame */
799 control->sframe = 1;
800 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
801 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
802
803 control->sar = 0;
804 control->txseq = 0;
805 } else {
806 /* I-Frame */
807 control->sframe = 0;
808 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
809 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
810
811 control->poll = 0;
812 control->super = 0;
813 }
814}
815
b76bbd66
MM		 816static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
817{
818 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
819 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
820
821 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
822 /* S-Frame */
823 control->sframe = 1;
824 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
825 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
826
827 control->sar = 0;
828 control->txseq = 0;
829 } else {
830 /* I-Frame */
831 control->sframe = 0;
832 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
833 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
834
835 control->poll = 0;
836 control->super = 0;
837 }
838}
839
840static inline void __unpack_control(struct l2cap_chan *chan,
841 struct sk_buff *skb)
842{
843 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
844 __unpack_extended_control(get_unaligned_le32(skb->data),
845 &bt_cb(skb)->control);
cec8ab6e 846 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 847 } else {
848 __unpack_enhanced_control(get_unaligned_le16(skb->data),
849 &bt_cb(skb)->control);
cec8ab6e 850 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 851 }
852}
853
b5c6aaed
MM		 854static u32 __pack_extended_control(struct l2cap_ctrl *control)
855{
856 u32 packed;
857
858 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
859 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
860
861 if (control->sframe) {
862 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
863 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
864 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
865 } else {
866 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
867 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
868 }
869
870 return packed;
871}
872
873static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
874{
875 u16 packed;
876
877 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
878 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
879
880 if (control->sframe) {
881 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
882 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
883 packed |= L2CAP_CTRL_FRAME_TYPE;
884 } else {
885 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
886 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
887 }
888
889 return packed;
890}
891
b76bbd66
MM		 892static inline void __pack_control(struct l2cap_chan *chan,
893 struct l2cap_ctrl *control,
894 struct sk_buff *skb)
895{
896 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
897 put_unaligned_le32(__pack_extended_control(control),
898 skb->data + L2CAP_HDR_SIZE);
899 } else {
900 put_unaligned_le16(__pack_enhanced_control(control),
901 skb->data + L2CAP_HDR_SIZE);
902 }
903}
904
ba7aa64f
GP		 905static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
906{
907 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
908 return L2CAP_EXT_HDR_SIZE;
909 else
910 return L2CAP_ENH_HDR_SIZE;
911}
912
a67d7f6f
MM		 913static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
914 u32 control)
b5c6aaed
MM		 915{
916 struct sk_buff *skb;
917 struct l2cap_hdr *lh;
ba7aa64f 918 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 919
920 if (chan->fcs == L2CAP_FCS_CRC16)
921 hlen += L2CAP_FCS_SIZE;
922
a67d7f6f 923 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 924
b5c6aaed 925 if (!skb)
a67d7f6f 926 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 927
928 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
929 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
930 lh->cid = cpu_to_le16(chan->dcid);
931
a67d7f6f
MM		 932 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
933 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
934 else
935 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 936
937 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 938 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 939 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
940 }
941
942 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 943 return skb;
944}
945
946static void l2cap_send_sframe(struct l2cap_chan *chan,
947 struct l2cap_ctrl *control)
948{
949 struct sk_buff *skb;
950 u32 control_field;
951
952 BT_DBG("chan %p, control %p", chan, control);
953
954 if (!control->sframe)
955 return;
956
b99e13ad
MM		 957 if (__chan_is_moving(chan))
958 return;
959
a67d7f6f
MM		 960 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
961 !control->poll)
962 control->final = 1;
963
964 if (control->super == L2CAP_SUPER_RR)
965 clear_bit(CONN_RNR_SENT, &chan->conn_state);
966 else if (control->super == L2CAP_SUPER_RNR)
967 set_bit(CONN_RNR_SENT, &chan->conn_state);
968
969 if (control->super != L2CAP_SUPER_SREJ) {
970 chan->last_acked_seq = control->reqseq;
971 __clear_ack_timer(chan);
972 }
973
974 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
975 control->final, control->poll, control->super);
976
977 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
978 control_field = __pack_extended_control(control);
979 else
980 control_field = __pack_enhanced_control(control);
981
982 skb = l2cap_create_sframe_pdu(chan, control_field);
983 if (!IS_ERR(skb))
984 l2cap_do_send(chan, skb);
b5c6aaed
MM		 985}
986
c9e3d5e0 987static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 988{
c9e3d5e0
MM		 989 struct l2cap_ctrl control;
990
991 BT_DBG("chan %p, poll %d", chan, poll);
992
993 memset(&control, 0, sizeof(control));
994 control.sframe = 1;
995 control.poll = poll;
996
997 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
998 control.super = L2CAP_SUPER_RNR;
999 else
1000 control.super = L2CAP_SUPER_RR;
b5c6aaed 1001
c9e3d5e0
MM		 1002 control.reqseq = chan->buffer_seq;
1003 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1004}
1005
b4450035 1006static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1007{
c1360a1c 1008 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1009}
1010
93c3e8f5
AE		 1011static bool __amp_capable(struct l2cap_chan *chan)
1012{
1013 struct l2cap_conn *conn = chan->conn;
1014
1015 if (enable_hs &&
5d05416e 1016 hci_amp_capable() &&
93c3e8f5
AE		 1017 chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED &&
1018 conn->fixed_chan_mask & L2CAP_FC_A2MP)
1019 return true;
1020 else
1021 return false;
1022}
1023
5ce66b59
AE		 1024static bool l2cap_check_efs(struct l2cap_chan *chan)
1025{
1026 /* Check EFS parameters */
1027 return true;
1028}
1029
2766be48 1030void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1031{
1032 struct l2cap_conn *conn = chan->conn;
1033 struct l2cap_conn_req req;
1034
1035 req.scid = cpu_to_le16(chan->scid);
1036 req.psm = chan->psm;
1037
1038 chan->ident = l2cap_get_ident(conn);
1039
1040 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1041
1042 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1043}
1044
8eb200bd
MM		 1045static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1046{
1047 struct l2cap_create_chan_req req;
1048 req.scid = cpu_to_le16(chan->scid);
1049 req.psm = chan->psm;
1050 req.amp_id = amp_id;
1051
1052 chan->ident = l2cap_get_ident(chan->conn);
1053
1054 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1055 sizeof(req), &req);
1056}
1057
02b0fbb9
MM		 1058static void l2cap_move_setup(struct l2cap_chan *chan)
1059{
1060 struct sk_buff *skb;
1061
1062 BT_DBG("chan %p", chan);
1063
1064 if (chan->mode != L2CAP_MODE_ERTM)
1065 return;
1066
1067 __clear_retrans_timer(chan);
1068 __clear_monitor_timer(chan);
1069 __clear_ack_timer(chan);
1070
1071 chan->retry_count = 0;
1072 skb_queue_walk(&chan->tx_q, skb) {
1073 if (bt_cb(skb)->control.retries)
1074 bt_cb(skb)->control.retries = 1;
1075 else
1076 break;
1077 }
1078
1079 chan->expected_tx_seq = chan->buffer_seq;
1080
1081 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1082 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1083 l2cap_seq_list_clear(&chan->retrans_list);
1084 l2cap_seq_list_clear(&chan->srej_list);
1085 skb_queue_purge(&chan->srej_q);
1086
1087 chan->tx_state = L2CAP_TX_STATE_XMIT;
1088 chan->rx_state = L2CAP_RX_STATE_MOVE;
1089
1090 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1091}
1092
5f3847a4
MM		 1093static void l2cap_move_done(struct l2cap_chan *chan)
1094{
1095 u8 move_role = chan->move_role;
1096 BT_DBG("chan %p", chan);
1097
1098 chan->move_state = L2CAP_MOVE_STABLE;
1099 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1100
1101 if (chan->mode != L2CAP_MODE_ERTM)
1102 return;
1103
1104 switch (move_role) {
1105 case L2CAP_MOVE_ROLE_INITIATOR:
1106 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1107 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1108 break;
1109 case L2CAP_MOVE_ROLE_RESPONDER:
1110 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1111 break;
1112 }
1113}
1114
9f0caeb1
VCG		 1115static void l2cap_chan_ready(struct l2cap_chan *chan)
1116{
2827011f 1117 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1118 chan->conf_state = 0;
1119 __clear_chan_timer(chan);
1120
54a59aa2 1121 chan->state = BT_CONNECTED;
9f0caeb1 1122
fd83e2c2 1123 chan->ops->ready(chan);
9f0caeb1
VCG		 1124}
1125
93c3e8f5
AE		 1126static void l2cap_start_connection(struct l2cap_chan *chan)
1127{
1128 if (__amp_capable(chan)) {
1129 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1130 a2mp_discover_amp(chan);
1131 } else {
1132 l2cap_send_conn_req(chan);
1133 }
1134}
1135
fc7f8a7e 1136static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1137{
8c1d787b 1138 struct l2cap_conn *conn = chan->conn;
79d554a6 1139
9f0caeb1
VCG		 1140 if (conn->hcon->type == LE_LINK) {
1141 l2cap_chan_ready(chan);
1142 return;
1143 }
1144
79d554a6 1145 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1146 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1147 return;
1148
d45fc423 1149 if (l2cap_chan_check_security(chan) &&
2d792818 1150 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1151 l2cap_start_connection(chan);
1152 }
79d554a6
MH		 1153 } else {
1154 struct l2cap_info_req req;
ac73498c 1155 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1156
1157 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1158 conn->info_ident = l2cap_get_ident(conn);
1159
ba13ccd9 1160 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1161
2d792818
GP		 1162 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1163 sizeof(req), &req);
79d554a6
MH		 1164 }
1165}
1166
cf6c2c0b
GP		 1167static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1168{
1169 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1170 if (!disable_ertm)
cf6c2c0b
GP		 1171 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1172
1173 switch (mode) {
1174 case L2CAP_MODE_ERTM:
1175 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1176 case L2CAP_MODE_STREAMING:
1177 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1178 default:
1179 return 0x00;
1180 }
1181}
1182
5e4e3972 1183static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1184{
6be36555 1185 struct sock *sk = chan->sk;
5e4e3972 1186 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1187 struct l2cap_disconn_req req;
1188
c13ffa62
GP		 1189 if (!conn)
1190 return;
1191
aad3d0e3 1192 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1193 __clear_retrans_timer(chan);
1194 __clear_monitor_timer(chan);
1195 __clear_ack_timer(chan);
c13ffa62
GP		 1196 }
1197
416fa752 1198 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
d117773c 1199 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1200 return;
1201 }
1202
fe4128e0
GP		 1203 req.dcid = cpu_to_le16(chan->dcid);
1204 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1205 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1206 sizeof(req), &req);
c13ffa62 1207
6be36555 1208 lock_sock(sk);
0e587be7 1209 __l2cap_state_change(chan, BT_DISCONN);
2e0052e4 1210 __l2cap_chan_set_err(chan, err);
6be36555 1211 release_sock(sk);
22121fc9
GP		 1212}
1213
1da177e4 1214/* ---- L2CAP connections ---- */
4e8402a3
MH		 1215static void l2cap_conn_start(struct l2cap_conn *conn)
1216{
3df91ea2 1217 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1218
1219 BT_DBG("conn %p", conn);
1220
3df91ea2 1221 mutex_lock(&conn->chan_lock);
4e8402a3 1222
3df91ea2 1223 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 1224 struct sock *sk = chan->sk;
baa7e1fa 1225
6be36555 1226 l2cap_chan_lock(chan);
4e8402a3 1227
715ec005 1228 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1229 l2cap_chan_unlock(chan);
79d554a6
MH		 1230 continue;
1231 }
1232
89bc500e 1233 if (chan->state == BT_CONNECT) {
d45fc423 1234 if (!l2cap_chan_check_security(chan) ||
2d792818 1235 !__l2cap_no_conn_pending(chan)) {
6be36555 1236 l2cap_chan_unlock(chan);
47731de7
GP		 1237 continue;
1238 }
79d554a6 1239
c1360a1c 1240 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1241 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1242 &chan->conf_state)) {
89bc500e 1243 l2cap_chan_close(chan, ECONNRESET);
6be36555 1244 l2cap_chan_unlock(chan);
47731de7 1245 continue;
b1235d79 1246 }
47731de7 1247
93c3e8f5 1248 l2cap_start_connection(chan);
47731de7 1249
89bc500e 1250 } else if (chan->state == BT_CONNECT2) {
79d554a6 1251 struct l2cap_conn_rsp rsp;
e9aeb2dd 1252 char buf[128];
fe4128e0
GP		 1253 rsp.scid = cpu_to_le16(chan->dcid);
1254 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1255
d45fc423 1256 if (l2cap_chan_check_security(chan)) {
6be36555 1257 lock_sock(sk);
c5daa683
GP		 1258 if (test_bit(BT_SK_DEFER_SETUP,
1259 &bt_sk(sk)->flags)) {
ac73498c
AE		 1260 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1261 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1262 chan->ops->defer(chan);
f66dc81f
MH		 1263
1264 } else {
0e587be7 1265 __l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1266 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1267 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1268 }
6be36555 1269 release_sock(sk);
79d554a6 1270 } else {
ac73498c
AE		 1271 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1272 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1273 }
1274
fc7f8a7e 1275 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1276 sizeof(rsp), &rsp);
e9aeb2dd 1277
c1360a1c 1278 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1279 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1280 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1281 continue;
1282 }
1283
c1360a1c 1284 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1285 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1286 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1287 chan->num_conf_req++;
4e8402a3
MH		 1288 }
1289
6be36555 1290 l2cap_chan_unlock(chan);
4e8402a3
MH		 1291 }
1292
3df91ea2 1293 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1294}
1295
c2287681 1296/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1297 * Returns closest match, locked.
1298 */
d9b88702 1299static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1300 bdaddr_t *src,
1301 bdaddr_t *dst)
b62f328b 1302{
23691d75 1303 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1304
23691d75 1305 read_lock(&chan_list_lock);
b62f328b 1306
23691d75
GP		 1307 list_for_each_entry(c, &chan_list, global_l) {
1308 struct sock *sk = c->sk;
fe4128e0 1309
89bc500e 1310 if (state && c->state != state)
b62f328b
VT		 1311 continue;
1312
23691d75 1313 if (c->scid == cid) {
c2287681
IY		 1314 int src_match, dst_match;
1315 int src_any, dst_any;
1316
b62f328b 1317 /* Exact match. */
c2287681
IY		 1318 src_match = !bacmp(&bt_sk(sk)->src, src);
1319 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1320 if (src_match && dst_match) {
23691d75
GP		 1321 read_unlock(&chan_list_lock);
1322 return c;
1323 }
b62f328b
VT		 1324
1325 /* Closest match */
c2287681
IY		 1326 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1327 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1328 if ((src_match && dst_any) || (src_any && dst_match) ||
1329 (src_any && dst_any))
23691d75 1330 c1 = c;
b62f328b
VT		 1331 }
1332 }
280f294f 1333
23691d75 1334 read_unlock(&chan_list_lock);
b62f328b 1335
23691d75 1336 return c1;
b62f328b
VT		 1337}
1338
1339static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1340{
c916fbe4 1341 struct sock *parent, *sk;
23691d75 1342 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 1343
1344 BT_DBG("");
1345
1346 /* Check if we have socket listening on cid */
23691d75 1347 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
c2287681 1348 conn->src, conn->dst);
23691d75 1349 if (!pchan)
b62f328b
VT		 1350 return;
1351
23691d75
GP		 1352 parent = pchan->sk;
1353
aa2ac881 1354 lock_sock(parent);
62f3a2cf 1355
80b98027 1356 chan = pchan->ops->new_connection(pchan);
80808e43 1357 if (!chan)
b62f328b
VT		 1358 goto clean;
1359
80808e43 1360 sk = chan->sk;
5d41ce1d 1361
b62f328b 1362 hci_conn_hold(conn->hcon);
a9ea3ed9 1363 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
b62f328b 1364
b62f328b
VT		 1365 bacpy(&bt_sk(sk)->src, conn->src);
1366 bacpy(&bt_sk(sk)->dst, conn->dst);
1367
3d57dc68 1368 l2cap_chan_add(conn, chan);
48454079 1369
6754e0df 1370 l2cap_chan_ready(chan);
b62f328b 1371
b62f328b 1372clean:
aa2ac881 1373 release_sock(parent);
b62f328b
VT		 1374}
1375
4e8402a3
MH		 1376static void l2cap_conn_ready(struct l2cap_conn *conn)
1377{
48454079 1378 struct l2cap_chan *chan;
cc110922 1379 struct hci_conn *hcon = conn->hcon;
4e8402a3 1380
79d554a6 1381 BT_DBG("conn %p", conn);
4e8402a3 1382
cc110922 1383 if (!hcon->out && hcon->type == LE_LINK)
b62f328b
VT		 1384 l2cap_le_conn_ready(conn);
1385
cc110922
VCG		 1386 if (hcon->out && hcon->type == LE_LINK)
1387 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1388
3df91ea2 1389 mutex_lock(&conn->chan_lock);
4e8402a3 1390
3df91ea2 1391 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1392
6be36555 1393 l2cap_chan_lock(chan);
4e8402a3 1394
416fa752
AE		 1395 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1396 l2cap_chan_unlock(chan);
1397 continue;
1398 }
1399
cc110922
VCG		 1400 if (hcon->type == LE_LINK) {
1401 if (smp_conn_security(hcon, chan->sec_level))
cf4cd009 1402 l2cap_chan_ready(chan);
acd7d370 1403
63128451 1404 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1405 struct sock *sk = chan->sk;
c9b66675 1406 __clear_chan_timer(chan);
6be36555 1407 lock_sock(sk);
0e587be7 1408 __l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1409 sk->sk_state_change(sk);
6be36555 1410 release_sock(sk);
b501d6a1 1411
89bc500e 1412 } else if (chan->state == BT_CONNECT)
fc7f8a7e 1413 l2cap_do_start(chan);
4e8402a3 1414
6be36555 1415 l2cap_chan_unlock(chan);
4e8402a3 1416 }
79d554a6 1417
3df91ea2 1418 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1419}
1420
1421/* Notify sockets that we cannot guaranty reliability anymore */
1422static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1423{
48454079 1424 struct l2cap_chan *chan;
4e8402a3
MH		 1425
1426 BT_DBG("conn %p", conn);
1427
3df91ea2 1428 mutex_lock(&conn->chan_lock);
4e8402a3 1429
3df91ea2 1430 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1431 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1432 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1433 }
1434
3df91ea2 1435 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1436}
1437
f878fcad 1438static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1439{
f878fcad 1440 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1441 info_timer.work);
4e8402a3 1442
984947dc 1443 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1444 conn->info_ident = 0;
984947dc 1445
4e8402a3
MH		 1446 l2cap_conn_start(conn);
1447}
1448
2c8e1411
DH		 1449/*
1450 * l2cap_user
1451 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1452 * callback is called during registration. The ->remove callback is called
1453 * during unregistration.
1454 * An l2cap_user object can either be explicitly unregistered or when the
1455 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1456 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1457 * External modules must own a reference to the l2cap_conn object if they intend
1458 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1459 * any time if they don't.
1460 */
1461
1462int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1463{
1464 struct hci_dev *hdev = conn->hcon->hdev;
1465 int ret;
1466
1467 /* We need to check whether l2cap_conn is registered. If it is not, we
1468 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1469 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1470 * relies on the parent hci_conn object to be locked. This itself relies
1471 * on the hci_dev object to be locked. So we must lock the hci device
1472 * here, too. */
1473
1474 hci_dev_lock(hdev);
1475
1476 if (user->list.next || user->list.prev) {
1477 ret = -EINVAL;
1478 goto out_unlock;
1479 }
1480
1481 /* conn->hchan is NULL after l2cap_conn_del() was called */
1482 if (!conn->hchan) {
1483 ret = -ENODEV;
1484 goto out_unlock;
1485 }
1486
1487 ret = user->probe(conn, user);
1488 if (ret)
1489 goto out_unlock;
1490
1491 list_add(&user->list, &conn->users);
1492 ret = 0;
1493
1494out_unlock:
1495 hci_dev_unlock(hdev);
1496 return ret;
1497}
1498EXPORT_SYMBOL(l2cap_register_user);
1499
1500void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1501{
1502 struct hci_dev *hdev = conn->hcon->hdev;
1503
1504 hci_dev_lock(hdev);
1505
1506 if (!user->list.next || !user->list.prev)
1507 goto out_unlock;
1508
1509 list_del(&user->list);
1510 user->list.next = NULL;
1511 user->list.prev = NULL;
1512 user->remove(conn, user);
1513
1514out_unlock:
1515 hci_dev_unlock(hdev);
1516}
1517EXPORT_SYMBOL(l2cap_unregister_user);
1518
1519static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1520{
1521 struct l2cap_user *user;
1522
1523 while (!list_empty(&conn->users)) {
1524 user = list_first_entry(&conn->users, struct l2cap_user, list);
1525 list_del(&user->list);
1526 user->list.next = NULL;
1527 user->list.prev = NULL;
1528 user->remove(conn, user);
1529 }
1530}
1531
5d3de7df
VCG		 1532static void l2cap_conn_del(struct hci_conn *hcon, int err)
1533{
1534 struct l2cap_conn *conn = hcon->l2cap_data;
1535 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1536
1537 if (!conn)
1538 return;
1539
1540 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1541
1542 kfree_skb(conn->rx_skb);
1543
2c8e1411
DH		 1544 l2cap_unregister_all_users(conn);
1545
3df91ea2
AE		 1546 mutex_lock(&conn->chan_lock);
1547
5d3de7df
VCG		 1548 /* Kill channels */
1549 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1550 l2cap_chan_hold(chan);
6be36555
AE		 1551 l2cap_chan_lock(chan);
1552
5d3de7df 1553 l2cap_chan_del(chan, err);
6be36555
AE		 1554
1555 l2cap_chan_unlock(chan);
1556
80b98027 1557 chan->ops->close(chan);
61d6ef3e 1558 l2cap_chan_put(chan);
5d3de7df
VCG		 1559 }
1560
3df91ea2
AE		 1561 mutex_unlock(&conn->chan_lock);
1562
73d80deb
LAD		 1563 hci_chan_del(conn->hchan);
1564
5d3de7df 1565 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1566 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1567
51a8efd7 1568 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1569 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1570 smp_chan_destroy(conn);
d26a2345 1571 }
5d3de7df
VCG		 1572
1573 hcon->l2cap_data = NULL;
9c903e37
DH		 1574 conn->hchan = NULL;
1575 l2cap_conn_put(conn);
5d3de7df
VCG		 1576}
1577
6c9d42a1 1578static void security_timeout(struct work_struct *work)
5d3de7df 1579{
6c9d42a1 1580 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1581 security_timer.work);
5d3de7df 1582
d06cc416
JH		 1583 BT_DBG("conn %p", conn);
1584
1585 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1586 smp_chan_destroy(conn);
1587 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1588 }
5d3de7df
VCG		 1589}
1590
baf43251 1591static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
1da177e4 1592{
0139418c 1593 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1594 struct hci_chan *hchan;
1da177e4 1595
baf43251 1596 if (conn)
1da177e4
LT		 1597 return conn;
1598
73d80deb
LAD		 1599 hchan = hci_chan_create(hcon);
1600 if (!hchan)
1601 return NULL;
1602
8bcde1f2 1603 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
73d80deb
LAD		 1604 if (!conn) {
1605 hci_chan_del(hchan);
1da177e4 1606 return NULL;
73d80deb 1607 }
1da177e4 1608
9c903e37 1609 kref_init(&conn->ref);
1da177e4
LT		 1610 hcon->l2cap_data = conn;
1611 conn->hcon = hcon;
9c903e37 1612 hci_conn_get(conn->hcon);
73d80deb 1613 conn->hchan = hchan;
1da177e4 1614
73d80deb 1615 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1616
dcc042d5 1617 switch (hcon->type) {
dcc042d5
AE		 1618 case LE_LINK:
1619 if (hcon->hdev->le_mtu) {
1620 conn->mtu = hcon->hdev->le_mtu;
1621 break;
1622 }
1623 /* fall through */
dcc042d5 1624 default:
acd7d370 1625 conn->mtu = hcon->hdev->acl_mtu;
dcc042d5
AE		 1626 break;
1627 }
acd7d370 1628
1da177e4
LT		 1629 conn->src = &hcon->hdev->bdaddr;
1630 conn->dst = &hcon->dst;
1631
4e8402a3
MH		 1632 conn->feat_mask = 0;
1633
1da177e4 1634 spin_lock_init(&conn->lock);
3df91ea2 1635 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1636
1637 INIT_LIST_HEAD(&conn->chan_l);
2c8e1411 1638 INIT_LIST_HEAD(&conn->users);
1da177e4 1639
5d3de7df 1640 if (hcon->type == LE_LINK)
6c9d42a1 1641 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1642 else
030013d8 1643 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1644
9f5a0d7b 1645 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1646
1da177e4
LT		 1647 return conn;
1648}
1649
9c903e37
DH		 1650static void l2cap_conn_free(struct kref *ref)
1651{
1652 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1653
1654 hci_conn_put(conn->hcon);
1655 kfree(conn);
1656}
1657
1658void l2cap_conn_get(struct l2cap_conn *conn)
1659{
1660 kref_get(&conn->ref);
1661}
1662EXPORT_SYMBOL(l2cap_conn_get);
1663
1664void l2cap_conn_put(struct l2cap_conn *conn)
1665{
1666 kref_put(&conn->ref, l2cap_conn_free);
1667}
1668EXPORT_SYMBOL(l2cap_conn_put);
1669
1da177e4 1670/* ---- Socket interface ---- */
1da177e4 1671
c2287681 1672/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1673 * Returns closest match.
1674 */
c2287681
IY		 1675static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1676 bdaddr_t *src,
1677 bdaddr_t *dst)
1da177e4 1678{
23691d75 1679 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1680
23691d75 1681 read_lock(&chan_list_lock);
e0f0cb56 1682
23691d75
GP		 1683 list_for_each_entry(c, &chan_list, global_l) {
1684 struct sock *sk = c->sk;
fe4128e0 1685
89bc500e 1686 if (state && c->state != state)
1da177e4
LT		 1687 continue;
1688
23691d75 1689 if (c->psm == psm) {
c2287681
IY		 1690 int src_match, dst_match;
1691 int src_any, dst_any;
1692
1da177e4 1693 /* Exact match. */
c2287681
IY		 1694 src_match = !bacmp(&bt_sk(sk)->src, src);
1695 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1696 if (src_match && dst_match) {
a7567b20 1697 read_unlock(&chan_list_lock);
23691d75
GP		 1698 return c;
1699 }
1da177e4
LT		 1700
1701 /* Closest match */
c2287681
IY		 1702 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1703 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1704 if ((src_match && dst_any) || (src_any && dst_match) ||
1705 (src_any && dst_any))
23691d75 1706 c1 = c;
1da177e4
LT		 1707 }
1708 }
1da177e4 1709
23691d75 1710 read_unlock(&chan_list_lock);
e0f0cb56 1711
23691d75 1712 return c1;
1da177e4
LT		 1713}
1714
8e9f9892
AG		 1715int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1716 bdaddr_t *dst, u8 dst_type)
1da177e4 1717{
5d41ce1d 1718 struct sock *sk = chan->sk;
1da177e4 1719 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1720 struct l2cap_conn *conn;
1721 struct hci_conn *hcon;
1722 struct hci_dev *hdev;
09ab6f4c 1723 __u8 auth_type;
44d0e48e 1724 int err;
1da177e4 1725
6ed93dc6 1726 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst,
ab19516a 1727 dst_type, __le16_to_cpu(psm));
1da177e4 1728
af05b30b
GP		 1729 hdev = hci_get_route(dst, src);
1730 if (!hdev)
1da177e4
LT		 1731 return -EHOSTUNREACH;
1732
09fd0de5 1733 hci_dev_lock(hdev);
1da177e4 1734
6be36555 1735 l2cap_chan_lock(chan);
03a00194
GP		 1736
1737 /* PSM must be odd and lsb of upper byte must be 0 */
1738 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
2d792818 1739 chan->chan_type != L2CAP_CHAN_RAW) {
03a00194
GP		 1740 err = -EINVAL;
1741 goto done;
1742 }
1743
1744 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1745 err = -EINVAL;
1746 goto done;
1747 }
1748
1749 switch (chan->mode) {
1750 case L2CAP_MODE_BASIC:
1751 break;
1752 case L2CAP_MODE_ERTM:
1753 case L2CAP_MODE_STREAMING:
1754 if (!disable_ertm)
1755 break;
1756 /* fall through */
1757 default:
1758 err = -ENOTSUPP;
1759 goto done;
1760 }
1761
0797e01d 1762 switch (chan->state) {
03a00194
GP		 1763 case BT_CONNECT:
1764 case BT_CONNECT2:
1765 case BT_CONFIG:
1766 /* Already connecting */
1767 err = 0;
1768 goto done;
1769
1770 case BT_CONNECTED:
1771 /* Already connected */
1772 err = -EISCONN;
1773 goto done;
1774
1775 case BT_OPEN:
1776 case BT_BOUND:
1777 /* Can connect */
1778 break;
1779
1780 default:
1781 err = -EBADFD;
1782 goto done;
1783 }
1784
1785 /* Set destination address and psm */
0797e01d 1786 lock_sock(sk);
9219b2a0 1787 bacpy(&bt_sk(sk)->dst, dst);
6be36555
AE		 1788 release_sock(sk);
1789
03a00194
GP		 1790 chan->psm = psm;
1791 chan->dcid = cid;
1da177e4 1792
4343478f 1793 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1794
fe4128e0 1795 if (chan->dcid == L2CAP_CID_LE_DATA)
8e9f9892 1796 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1797 chan->sec_level, auth_type);
acd7d370 1798 else
8e9f9892 1799 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1800 chan->sec_level, auth_type);
acd7d370 1801
30e76272
VT		 1802 if (IS_ERR(hcon)) {
1803 err = PTR_ERR(hcon);
1da177e4 1804 goto done;
30e76272 1805 }
1da177e4 1806
baf43251 1807 conn = l2cap_conn_add(hcon);
1da177e4 1808 if (!conn) {
76a68ba0 1809 hci_conn_drop(hcon);
30e76272 1810 err = -ENOMEM;
1da177e4
LT		 1811 goto done;
1812 }
1813
9f0caeb1
VCG		 1814 if (hcon->type == LE_LINK) {
1815 err = 0;
1816
1817 if (!list_empty(&conn->chan_l)) {
1818 err = -EBUSY;
76a68ba0 1819 hci_conn_drop(hcon);
9f0caeb1
VCG		 1820 }
1821
1822 if (err)
1823 goto done;
1824 }
1825
1da177e4
LT		 1826 /* Update source addr of the socket */
1827 bacpy(src, conn->src);
1828
6be36555 1829 l2cap_chan_unlock(chan);
48454079 1830 l2cap_chan_add(conn, chan);
6be36555 1831 l2cap_chan_lock(chan);
48454079 1832
6be36555 1833 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1834 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1835
1836 if (hcon->state == BT_CONNECTED) {
715ec005 1837 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1838 __clear_chan_timer(chan);
d45fc423 1839 if (l2cap_chan_check_security(chan))
6be36555 1840 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1841 } else
fc7f8a7e 1842 l2cap_do_start(chan);
1da177e4
LT		 1843 }
1844
30e76272
VT		 1845 err = 0;
1846
1da177e4 1847done:
6be36555 1848 l2cap_chan_unlock(chan);
09fd0de5 1849 hci_dev_unlock(hdev);
1da177e4
LT		 1850 hci_dev_put(hdev);
1851 return err;
1852}
1853
dcba0dba 1854int __l2cap_wait_ack(struct sock *sk)
6161c038 1855{
8c1d787b 1856 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1857 DECLARE_WAITQUEUE(wait, current);
1858 int err = 0;
1859 int timeo = HZ/5;
1860
2b0b05dd 1861 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1862 set_current_state(TASK_INTERRUPTIBLE);
1863 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1864 if (!timeo)
1865 timeo = HZ/5;
1866
1867 if (signal_pending(current)) {
1868 err = sock_intr_errno(timeo);
1869 break;
1870 }
1871
1872 release_sock(sk);
1873 timeo = schedule_timeout(timeo);
1874 lock_sock(sk);
a71a0cf4 1875 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1876
1877 err = sock_error(sk);
1878 if (err)
1879 break;
1880 }
1881 set_current_state(TASK_RUNNING);
2b0b05dd 1882 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1883 return err;
1884}
1885
721c4181 1886static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1887{
721c4181 1888 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1889 monitor_timer.work);
e90bac06 1890
525cd185 1891 BT_DBG("chan %p", chan);
0e98958d 1892
6be36555
AE		 1893 l2cap_chan_lock(chan);
1894
80909e04 1895 if (!chan->conn) {
6be36555 1896 l2cap_chan_unlock(chan);
8d7e1c7f 1897 l2cap_chan_put(chan);
e90bac06
GP		 1898 return;
1899 }
1900
401bb1f7 1901 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1902
6be36555 1903 l2cap_chan_unlock(chan);
8d7e1c7f 1904 l2cap_chan_put(chan);
e90bac06
GP		 1905}
1906
721c4181 1907static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1908{
721c4181 1909 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1910 retrans_timer.work);
e90bac06 1911
49208c9c 1912 BT_DBG("chan %p", chan);
0e98958d 1913
6be36555
AE		 1914 l2cap_chan_lock(chan);
1915
80909e04
MM		 1916 if (!chan->conn) {
1917 l2cap_chan_unlock(chan);
1918 l2cap_chan_put(chan);
1919 return;
1920 }
6be36555 1921
401bb1f7 1922 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1923 l2cap_chan_unlock(chan);
8d7e1c7f 1924 l2cap_chan_put(chan);
e90bac06
GP		 1925}
1926
d660366d
GP		 1927static void l2cap_streaming_send(struct l2cap_chan *chan,
1928 struct sk_buff_head *skbs)
6840ed07 1929{
ccbb84af 1930 struct sk_buff *skb;
3733937d 1931 struct l2cap_ctrl *control;
6840ed07 1932
3733937d
MM		 1933 BT_DBG("chan %p, skbs %p", chan, skbs);
1934
b99e13ad
MM		 1935 if (__chan_is_moving(chan))
1936 return;
1937
3733937d
MM		 1938 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1939
1940 while (!skb_queue_empty(&chan->tx_q)) {
1941
1942 skb = skb_dequeue(&chan->tx_q);
1943
1944 bt_cb(skb)->control.retries = 1;
1945 control = &bt_cb(skb)->control;
1946
1947 control->reqseq = 0;
1948 control->txseq = chan->next_tx_seq;
1949
1950 __pack_control(chan, control, skb);
6840ed07 1951
47d1ec61 1952 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1953 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1954 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1955 }
1956
4343478f 1957 l2cap_do_send(chan, skb);
6840ed07 1958
b4400672 1959 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1960
836be934 1961 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1962 chan->frames_sent++;
6840ed07 1963 }
6840ed07
GP		 1964}
1965
67c9e840 1966static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1967{
1968 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1969 struct l2cap_ctrl *control;
1970 int sent = 0;
1971
1972 BT_DBG("chan %p", chan);
1c2acffb 1973
89bc500e 1974 if (chan->state != BT_CONNECTED)
c13ffa62 1975 return -ENOTCONN;
e90bac06 1976
94122bbe
MM		 1977 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1978 return 0;
1979
b99e13ad
MM		 1980 if (__chan_is_moving(chan))
1981 return 0;
1982
18a48e76
MM		 1983 while (chan->tx_send_head &&
1984 chan->unacked_frames < chan->remote_tx_win &&
1985 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1986
18a48e76 1987 skb = chan->tx_send_head;
e90bac06 1988
18a48e76
MM		 1989 bt_cb(skb)->control.retries = 1;
1990 control = &bt_cb(skb)->control;
95ffa978 1991
e2ab4353 1992 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1993 control->final = 1;
e2ab4353 1994
18a48e76
MM		 1995 control->reqseq = chan->buffer_seq;
1996 chan->last_acked_seq = chan->buffer_seq;
1997 control->txseq = chan->next_tx_seq;
1c2acffb 1998
18a48e76 1999 __pack_control(chan, control, skb);
e90bac06 2000
47d1ec61 2001 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 2002 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
2003 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 2004 }
2005
18a48e76
MM		 2006 /* Clone after data has been modified. Data is assumed to be
2007 read-only (for locking purposes) on cloned sk_buffs.
2008 */
2009 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 2010
18a48e76
MM		 2011 if (!tx_skb)
2012 break;
1c2acffb 2013
18a48e76 2014 __set_retrans_timer(chan);
836be934
AE		 2015
2016 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 2017 chan->unacked_frames++;
6a026610 2018 chan->frames_sent++;
18a48e76 2019 sent++;
1c2acffb 2020
58d35f87
GP		 2021 if (skb_queue_is_last(&chan->tx_q, skb))
2022 chan->tx_send_head = NULL;
1c2acffb 2023 else
58d35f87 2024 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 2025
2026 l2cap_do_send(chan, tx_skb);
b4400672 2027 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 2028 }
2029
b4400672
AE		 2030 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
2031 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 2032
2033 return sent;
9e917af1
GP		 2034}
2035
e1fbd4c1
MM		 2036static void l2cap_ertm_resend(struct l2cap_chan *chan)
2037{
2038 struct l2cap_ctrl control;
2039 struct sk_buff *skb;
2040 struct sk_buff *tx_skb;
2041 u16 seq;
2042
2043 BT_DBG("chan %p", chan);
2044
2045 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2046 return;
2047
b99e13ad
MM		 2048 if (__chan_is_moving(chan))
2049 return;
2050
e1fbd4c1
MM		 2051 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
2052 seq = l2cap_seq_list_pop(&chan->retrans_list);
2053
2054 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
2055 if (!skb) {
2056 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 2057 seq);
e1fbd4c1
MM		 2058 continue;
2059 }
2060
2061 bt_cb(skb)->control.retries++;
2062 control = bt_cb(skb)->control;
2063
2064 if (chan->max_tx != 0 &&
2065 bt_cb(skb)->control.retries > chan->max_tx) {
2066 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 2067 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 2068 l2cap_seq_list_clear(&chan->retrans_list);
2069 break;
2070 }
2071
2072 control.reqseq = chan->buffer_seq;
2073 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2074 control.final = 1;
2075 else
2076 control.final = 0;
2077
2078 if (skb_cloned(skb)) {
2079 /* Cloned sk_buffs are read-only, so we need a
2080 * writeable copy
2081 */
8bcde1f2 2082 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 2083 } else {
8bcde1f2 2084 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 2085 }
2086
2087 if (!tx_skb) {
2088 l2cap_seq_list_clear(&chan->retrans_list);
2089 break;
2090 }
2091
2092 /* Update skb contents */
2093 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2094 put_unaligned_le32(__pack_extended_control(&control),
2095 tx_skb->data + L2CAP_HDR_SIZE);
2096 } else {
2097 put_unaligned_le16(__pack_enhanced_control(&control),
2098 tx_skb->data + L2CAP_HDR_SIZE);
2099 }
2100
2101 if (chan->fcs == L2CAP_FCS_CRC16) {
2102 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2103 put_unaligned_le16(fcs, skb_put(tx_skb,
2104 L2CAP_FCS_SIZE));
2105 }
2106
2107 l2cap_do_send(chan, tx_skb);
2108
2109 BT_DBG("Resent txseq %d", control.txseq);
2110
2111 chan->last_acked_seq = chan->buffer_seq;
2112 }
2113}
2114
f80842a8
MM		 2115static void l2cap_retransmit(struct l2cap_chan *chan,
2116 struct l2cap_ctrl *control)
2117{
2118 BT_DBG("chan %p, control %p", chan, control);
2119
2120 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2121 l2cap_ertm_resend(chan);
2122}
2123
d2a7ac5d
MM		 2124static void l2cap_retransmit_all(struct l2cap_chan *chan,
2125 struct l2cap_ctrl *control)
2126{
e1fbd4c1
MM		 2127 struct sk_buff *skb;
2128
2129 BT_DBG("chan %p, control %p", chan, control);
2130
2131 if (control->poll)
2132 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2133
2134 l2cap_seq_list_clear(&chan->retrans_list);
2135
2136 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2137 return;
2138
2139 if (chan->unacked_frames) {
2140 skb_queue_walk(&chan->tx_q, skb) {
2141 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2142 skb == chan->tx_send_head)
e1fbd4c1
MM		 2143 break;
2144 }
2145
2146 skb_queue_walk_from(&chan->tx_q, skb) {
2147 if (skb == chan->tx_send_head)
2148 break;
2149
2150 l2cap_seq_list_append(&chan->retrans_list,
2151 bt_cb(skb)->control.txseq);
2152 }
2153
2154 l2cap_ertm_resend(chan);
2155 }
d2a7ac5d
MM		 2156}
2157
0a0aba42 2158static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2159{
0a0aba42
MM		 2160 struct l2cap_ctrl control;
2161 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2162 chan->last_acked_seq);
2163 int threshold;
9e917af1 2164
0a0aba42
MM		 2165 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2166 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2167
0a0aba42
MM		 2168 memset(&control, 0, sizeof(control));
2169 control.sframe = 1;
dfc909be 2170
0a0aba42
MM		 2171 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2172 chan->rx_state == L2CAP_RX_STATE_RECV) {
2173 __clear_ack_timer(chan);
2174 control.super = L2CAP_SUPER_RNR;
2175 control.reqseq = chan->buffer_seq;
2176 l2cap_send_sframe(chan, &control);
2177 } else {
2178 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2179 l2cap_ertm_send(chan);
2180 /* If any i-frames were sent, they included an ack */
2181 if (chan->buffer_seq == chan->last_acked_seq)
2182 frames_to_ack = 0;
2183 }
dfc909be 2184
c20f8e35 2185 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2186 * Calculate without mul or div
2187 */
c20f8e35 2188 threshold = chan->ack_win;
0a0aba42
MM		 2189 threshold += threshold << 1;
2190 threshold >>= 2;
2191
b4400672 2192 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2193 threshold);
2194
2195 if (frames_to_ack >= threshold) {
2196 __clear_ack_timer(chan);
2197 control.super = L2CAP_SUPER_RR;
2198 control.reqseq = chan->buffer_seq;
2199 l2cap_send_sframe(chan, &control);
2200 frames_to_ack = 0;
2201 }
1c2acffb 2202
0a0aba42
MM		 2203 if (frames_to_ack)
2204 __set_ack_timer(chan);
2205 }
b17e73bb
SJ		 2206}
2207
04124681
GP		 2208static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2209 struct msghdr *msg, int len,
2210 int count, struct sk_buff *skb)
1c2acffb 2211{
0952a57a 2212 struct l2cap_conn *conn = chan->conn;
1c2acffb 2213 struct sk_buff **frag;
90338947 2214 int sent = 0;
1da177e4 2215
59203a21 2216 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2217 return -EFAULT;
1da177e4
LT		 2218
2219 sent += count;
2220 len -= count;
2221
2222 /* Continuation fragments (no L2CAP header) */
2223 frag = &skb_shinfo(skb)->frag_list;
2224 while (len) {
fbe00700
GP		 2225 struct sk_buff *tmp;
2226
1da177e4
LT		 2227 count = min_t(unsigned int, conn->mtu, len);
2228
fbe00700
GP		 2229 tmp = chan->ops->alloc_skb(chan, count,
2230 msg->msg_flags & MSG_DONTWAIT);
2231 if (IS_ERR(tmp))
2232 return PTR_ERR(tmp);
2233
2234 *frag = tmp;
2f7719ce 2235
1c2acffb
GP		 2236 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2237 return -EFAULT;
1da177e4 2238
5e59b791
LAD		 2239 (*frag)->priority = skb->priority;
2240
1da177e4
LT		 2241 sent += count;
2242 len -= count;
2243
2d0ed3d5
GP		 2244 skb->len += (*frag)->len;
2245 skb->data_len += (*frag)->len;
2246
1da177e4
LT		 2247 frag = &(*frag)->next;
2248 }
1da177e4
LT		 2249
2250 return sent;
1c2acffb 2251}
1da177e4 2252
5e59b791 2253static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2254 struct msghdr *msg, size_t len,
2255 u32 priority)
1c2acffb 2256{
8c1d787b 2257 struct l2cap_conn *conn = chan->conn;
1c2acffb 2258 struct sk_buff *skb;
03a51213 2259 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2260 struct l2cap_hdr *lh;
2261
b4400672 2262 BT_DBG("chan %p len %zu priority %u", chan, len, priority);
1c2acffb
GP		 2263
2264 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2265
2266 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2267 msg->msg_flags & MSG_DONTWAIT);
2268 if (IS_ERR(skb))
2269 return skb;
1c2acffb 2270
5e59b791
LAD		 2271 skb->priority = priority;
2272
1c2acffb
GP		 2273 /* Create L2CAP header */
2274 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2275 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c
AE		 2276 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2277 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2278
0952a57a 2279 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2280 if (unlikely(err < 0)) {
2281 kfree_skb(skb);
2282 return ERR_PTR(err);
2283 }
2284 return skb;
2285}
2286
5e59b791 2287static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2288 struct msghdr *msg, size_t len,
2289 u32 priority)
1c2acffb 2290{
8c1d787b 2291 struct l2cap_conn *conn = chan->conn;
1c2acffb 2292 struct sk_buff *skb;
f2ba7fae 2293 int err, count;
1c2acffb
GP		 2294 struct l2cap_hdr *lh;
2295
b4400672 2296 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2297
f2ba7fae 2298 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2299
f2ba7fae 2300 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2301 msg->msg_flags & MSG_DONTWAIT);
2302 if (IS_ERR(skb))
2303 return skb;
1c2acffb 2304
5e59b791
LAD		 2305 skb->priority = priority;
2306
1c2acffb
GP		 2307 /* Create L2CAP header */
2308 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2309 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2310 lh->len = cpu_to_le16(len);
1c2acffb 2311
0952a57a 2312 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2313 if (unlikely(err < 0)) {
2314 kfree_skb(skb);
2315 return ERR_PTR(err);
2316 }
2317 return skb;
2318}
2319
ab0ff76d 2320static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2321 struct msghdr *msg, size_t len,
2322 u16 sdulen)
1c2acffb 2323{
8c1d787b 2324 struct l2cap_conn *conn = chan->conn;
1c2acffb 2325 struct sk_buff *skb;
e4ca6d98 2326 int err, count, hlen;
1c2acffb
GP		 2327 struct l2cap_hdr *lh;
2328
b4400672 2329 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2330
0ee0d208
GP		 2331 if (!conn)
2332 return ERR_PTR(-ENOTCONN);
2333
ba7aa64f 2334 hlen = __ertm_hdr_size(chan);
e4ca6d98 2335
c74e560c 2336 if (sdulen)
03a51213 2337 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2338
47d1ec61 2339 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2340 hlen += L2CAP_FCS_SIZE;
fcc203c3 2341
1c2acffb 2342 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2343
2344 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2345 msg->msg_flags & MSG_DONTWAIT);
2346 if (IS_ERR(skb))
2347 return skb;
1c2acffb
GP		 2348
2349 /* Create L2CAP header */
2350 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2351 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2352 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2353
18a48e76
MM		 2354 /* Control header is populated later */
2355 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2356 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2357 else
2358 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2359
c74e560c 2360 if (sdulen)
03a51213 2361 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2362
0952a57a 2363 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2364 if (unlikely(err < 0)) {
2365 kfree_skb(skb);
2366 return ERR_PTR(err);
2367 }
e90bac06 2368
18a48e76 2369 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2370 bt_cb(skb)->control.retries = 0;
1c2acffb 2371 return skb;
1da177e4
LT		 2372}
2373
94122bbe
MM		 2374static int l2cap_segment_sdu(struct l2cap_chan *chan,
2375 struct sk_buff_head *seg_queue,
2376 struct msghdr *msg, size_t len)
c74e560c 2377{
c74e560c 2378 struct sk_buff *skb;
94122bbe
MM		 2379 u16 sdu_len;
2380 size_t pdu_len;
94122bbe 2381 u8 sar;
c74e560c 2382
b4400672 2383 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2384
94122bbe
MM		 2385 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2386 * so fragmented skbs are not used. The HCI layer's handling
2387 * of fragmented skbs is not compatible with ERTM's queueing.
2388 */
c74e560c 2389
94122bbe
MM		 2390 /* PDU size is derived from the HCI MTU */
2391 pdu_len = chan->conn->mtu;
c74e560c 2392
a549574d
MM		 2393 /* Constrain PDU size for BR/EDR connections */
2394 if (!chan->hs_hcon)
2395 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2396
2397 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2398 if (chan->fcs)
2399 pdu_len -= L2CAP_FCS_SIZE;
2400
ba7aa64f 2401 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2402
2403 /* Remote device may have requested smaller PDUs */
2404 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2405
2406 if (len <= pdu_len) {
2407 sar = L2CAP_SAR_UNSEGMENTED;
2408 sdu_len = 0;
2409 pdu_len = len;
2410 } else {
2411 sar = L2CAP_SAR_START;
2412 sdu_len = len;
2413 pdu_len -= L2CAP_SDULEN_SIZE;
2414 }
2415
2416 while (len > 0) {
2417 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2418
c74e560c 2419 if (IS_ERR(skb)) {
94122bbe 2420 __skb_queue_purge(seg_queue);
c74e560c
GP		 2421 return PTR_ERR(skb);
2422 }
2423
94122bbe
MM		 2424 bt_cb(skb)->control.sar = sar;
2425 __skb_queue_tail(seg_queue, skb);
2426
2427 len -= pdu_len;
2428 if (sdu_len) {
2429 sdu_len = 0;
2430 pdu_len += L2CAP_SDULEN_SIZE;
2431 }
2432
2433 if (len <= pdu_len) {
2434 sar = L2CAP_SAR_END;
2435 pdu_len = len;
2436 } else {
2437 sar = L2CAP_SAR_CONTINUE;
2438 }
c74e560c 2439 }
c74e560c 2440
f0f62799 2441 return 0;
c74e560c
GP		 2442}
2443
5e59b791 2444int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2445 u32 priority)
9a91a04a 2446{
9a91a04a 2447 struct sk_buff *skb;
9a91a04a 2448 int err;
94122bbe 2449 struct sk_buff_head seg_queue;
9a91a04a
GP		 2450
2451 /* Connectionless channel */
715ec005 2452 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2453 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2454 if (IS_ERR(skb))
2455 return PTR_ERR(skb);
2456
2457 l2cap_do_send(chan, skb);
2458 return len;
2459 }
2460
2461 switch (chan->mode) {
2462 case L2CAP_MODE_BASIC:
2463 /* Check outgoing MTU */
2464 if (len > chan->omtu)
2465 return -EMSGSIZE;
2466
2467 /* Create a basic PDU */
5e59b791 2468 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2469 if (IS_ERR(skb))
2470 return PTR_ERR(skb);
2471
2472 l2cap_do_send(chan, skb);
2473 err = len;
2474 break;
2475
2476 case L2CAP_MODE_ERTM:
2477 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2478 /* Check outgoing MTU */
2479 if (len > chan->omtu) {
2480 err = -EMSGSIZE;
2481 break;
2482 }
9a91a04a 2483
94122bbe 2484 __skb_queue_head_init(&seg_queue);
9a91a04a 2485
94122bbe
MM		 2486 /* Do segmentation before calling in to the state machine,
2487 * since it's possible to block while waiting for memory
2488 * allocation.
2489 */
2490 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2491
94122bbe
MM		 2492 /* The channel could have been closed while segmenting,
2493 * check that it is still connected.
2494 */
2495 if (chan->state != BT_CONNECTED) {
2496 __skb_queue_purge(&seg_queue);
2497 err = -ENOTCONN;
9a91a04a
GP		 2498 }
2499
94122bbe 2500 if (err)
9a91a04a 2501 break;
9a91a04a 2502
3733937d 2503 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2504 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2505 else
d660366d 2506 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2507
d660366d 2508 err = len;
9a91a04a 2509
94122bbe
MM		 2510 /* If the skbs were not queued for sending, they'll still be in
2511 * seg_queue and need to be purged.
2512 */
2513 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2514 break;
2515
2516 default:
2517 BT_DBG("bad state %1.1x", chan->mode);
2518 err = -EBADFD;
2519 }
2520
2521 return err;
2522}
2523
d2a7ac5d
MM		 2524static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2525{
bed68bde
MM		 2526 struct l2cap_ctrl control;
2527 u16 seq;
2528
b4400672 2529 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2530
2531 memset(&control, 0, sizeof(control));
2532 control.sframe = 1;
2533 control.super = L2CAP_SUPER_SREJ;
2534
2535 for (seq = chan->expected_tx_seq; seq != txseq;
2536 seq = __next_seq(chan, seq)) {
2537 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2538 control.reqseq = seq;
2539 l2cap_send_sframe(chan, &control);
2540 l2cap_seq_list_append(&chan->srej_list, seq);
2541 }
2542 }
2543
2544 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2545}
2546
2547static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2548{
bed68bde
MM		 2549 struct l2cap_ctrl control;
2550
2551 BT_DBG("chan %p", chan);
2552
2553 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2554 return;
2555
2556 memset(&control, 0, sizeof(control));
2557 control.sframe = 1;
2558 control.super = L2CAP_SUPER_SREJ;
2559 control.reqseq = chan->srej_list.tail;
2560 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2561}
2562
2563static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2564{
bed68bde
MM		 2565 struct l2cap_ctrl control;
2566 u16 initial_head;
2567 u16 seq;
2568
b4400672 2569 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2570
2571 memset(&control, 0, sizeof(control));
2572 control.sframe = 1;
2573 control.super = L2CAP_SUPER_SREJ;
2574
2575 /* Capture initial list head to allow only one pass through the list. */
2576 initial_head = chan->srej_list.head;
2577
2578 do {
2579 seq = l2cap_seq_list_pop(&chan->srej_list);
2580 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2581 break;
2582
2583 control.reqseq = seq;
2584 l2cap_send_sframe(chan, &control);
2585 l2cap_seq_list_append(&chan->srej_list, seq);
2586 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2587}
2588
608bcc6d
MM		 2589static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2590{
2591 struct sk_buff *acked_skb;
2592 u16 ackseq;
2593
b4400672 2594 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2595
2596 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2597 return;
2598
b4400672 2599 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2600 chan->expected_ack_seq, chan->unacked_frames);
2601
2602 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2603 ackseq = __next_seq(chan, ackseq)) {
2604
2605 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2606 if (acked_skb) {
2607 skb_unlink(acked_skb, &chan->tx_q);
2608 kfree_skb(acked_skb);
2609 chan->unacked_frames--;
2610 }
2611 }
2612
2613 chan->expected_ack_seq = reqseq;
2614
2615 if (chan->unacked_frames == 0)
2616 __clear_retrans_timer(chan);
2617
b4400672 2618 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2619}
2620
2621static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2622{
2623 BT_DBG("chan %p", chan);
2624
2625 chan->expected_tx_seq = chan->buffer_seq;
2626 l2cap_seq_list_clear(&chan->srej_list);
2627 skb_queue_purge(&chan->srej_q);
2628 chan->rx_state = L2CAP_RX_STATE_RECV;
2629}
2630
d660366d
GP		 2631static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2632 struct l2cap_ctrl *control,
2633 struct sk_buff_head *skbs, u8 event)
608bcc6d 2634{
608bcc6d
MM		 2635 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2636 event);
2637
2638 switch (event) {
2639 case L2CAP_EV_DATA_REQUEST:
2640 if (chan->tx_send_head == NULL)
2641 chan->tx_send_head = skb_peek(skbs);
2642
2643 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2644 l2cap_ertm_send(chan);
2645 break;
2646 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2647 BT_DBG("Enter LOCAL_BUSY");
2648 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2649
2650 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2651 /* The SREJ_SENT state must be aborted if we are to
2652 * enter the LOCAL_BUSY state.
2653 */
2654 l2cap_abort_rx_srej_sent(chan);
2655 }
2656
2657 l2cap_send_ack(chan);
2658
2659 break;
2660 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2661 BT_DBG("Exit LOCAL_BUSY");
2662 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2663
2664 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2665 struct l2cap_ctrl local_control;
2666
2667 memset(&local_control, 0, sizeof(local_control));
2668 local_control.sframe = 1;
2669 local_control.super = L2CAP_SUPER_RR;
2670 local_control.poll = 1;
2671 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2672 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2673
2674 chan->retry_count = 1;
2675 __set_monitor_timer(chan);
2676 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2677 }
2678 break;
2679 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2680 l2cap_process_reqseq(chan, control->reqseq);
2681 break;
2682 case L2CAP_EV_EXPLICIT_POLL:
2683 l2cap_send_rr_or_rnr(chan, 1);
2684 chan->retry_count = 1;
2685 __set_monitor_timer(chan);
2686 __clear_ack_timer(chan);
2687 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2688 break;
2689 case L2CAP_EV_RETRANS_TO:
2690 l2cap_send_rr_or_rnr(chan, 1);
2691 chan->retry_count = 1;
2692 __set_monitor_timer(chan);
2693 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2694 break;
2695 case L2CAP_EV_RECV_FBIT:
2696 /* Nothing to process */
2697 break;
2698 default:
2699 break;
2700 }
608bcc6d
MM		 2701}
2702
d660366d
GP		 2703static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2704 struct l2cap_ctrl *control,
2705 struct sk_buff_head *skbs, u8 event)
608bcc6d 2706{
608bcc6d
MM		 2707 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2708 event);
2709
2710 switch (event) {
2711 case L2CAP_EV_DATA_REQUEST:
2712 if (chan->tx_send_head == NULL)
2713 chan->tx_send_head = skb_peek(skbs);
2714 /* Queue data, but don't send. */
2715 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2716 break;
2717 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2718 BT_DBG("Enter LOCAL_BUSY");
2719 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2720
2721 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2722 /* The SREJ_SENT state must be aborted if we are to
2723 * enter the LOCAL_BUSY state.
2724 */
2725 l2cap_abort_rx_srej_sent(chan);
2726 }
2727
2728 l2cap_send_ack(chan);
2729
2730 break;
2731 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2732 BT_DBG("Exit LOCAL_BUSY");
2733 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2734
2735 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2736 struct l2cap_ctrl local_control;
2737 memset(&local_control, 0, sizeof(local_control));
2738 local_control.sframe = 1;
2739 local_control.super = L2CAP_SUPER_RR;
2740 local_control.poll = 1;
2741 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2742 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2743
2744 chan->retry_count = 1;
2745 __set_monitor_timer(chan);
2746 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2747 }
2748 break;
2749 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2750 l2cap_process_reqseq(chan, control->reqseq);
2751
2752 /* Fall through */
2753
2754 case L2CAP_EV_RECV_FBIT:
2755 if (control && control->final) {
2756 __clear_monitor_timer(chan);
2757 if (chan->unacked_frames > 0)
2758 __set_retrans_timer(chan);
2759 chan->retry_count = 0;
2760 chan->tx_state = L2CAP_TX_STATE_XMIT;
2761 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2762 }
2763 break;
2764 case L2CAP_EV_EXPLICIT_POLL:
2765 /* Ignore */
2766 break;
2767 case L2CAP_EV_MONITOR_TO:
2768 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2769 l2cap_send_rr_or_rnr(chan, 1);
2770 __set_monitor_timer(chan);
2771 chan->retry_count++;
2772 } else {
5e4e3972 2773 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2774 }
2775 break;
2776 default:
2777 break;
2778 }
608bcc6d
MM		 2779}
2780
d660366d
GP		 2781static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2782 struct sk_buff_head *skbs, u8 event)
608bcc6d 2783{
608bcc6d
MM		 2784 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2785 chan, control, skbs, event, chan->tx_state);
2786
2787 switch (chan->tx_state) {
2788 case L2CAP_TX_STATE_XMIT:
d660366d 2789 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2790 break;
2791 case L2CAP_TX_STATE_WAIT_F:
d660366d 2792 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2793 break;
2794 default:
2795 /* Ignore event */
2796 break;
2797 }
608bcc6d
MM		 2798}
2799
4b51dae9
MM		 2800static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2801 struct l2cap_ctrl *control)
2802{
2803 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2804 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2805}
2806
f80842a8
MM		 2807static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2808 struct l2cap_ctrl *control)
2809{
2810 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2811 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2812}
2813
1da177e4
LT		 2814/* Copy frame to all raw sockets on that connection */
2815static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2816{
1da177e4 2817 struct sk_buff *nskb;
48454079 2818 struct l2cap_chan *chan;
1da177e4
LT		 2819
2820 BT_DBG("conn %p", conn);
2821
3df91ea2 2822 mutex_lock(&conn->chan_lock);
3d57dc68 2823
3df91ea2 2824 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2825 struct sock *sk = chan->sk;
715ec005 2826 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2827 continue;
2828
2829 /* Don't send frame to the socket it came from */
2830 if (skb->sk == sk)
2831 continue;
8bcde1f2 2832 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2833 if (!nskb)
1da177e4
LT		 2834 continue;
2835
80b98027 2836 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2837 kfree_skb(nskb);
2838 }
3d57dc68 2839
3df91ea2 2840 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2841}
2842
2843/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2844static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2845 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2846{
2847 struct sk_buff *skb, **frag;
2848 struct l2cap_cmd_hdr *cmd;
2849 struct l2cap_hdr *lh;
2850 int len, count;
2851
b4400672
AE		 2852 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2853 conn, code, ident, dlen);
1da177e4
LT		 2854
2855 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2856 count = min_t(unsigned int, conn->mtu, len);
2857
8bcde1f2 2858 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2859 if (!skb)
2860 return NULL;
2861
2862 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2863 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2864
2865 if (conn->hcon->type == LE_LINK)
ac73498c 2866 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2867 else
ac73498c 2868 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2869
2870 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2871 cmd->code = code;
2872 cmd->ident = ident;
aca3192c 2873 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2874
2875 if (dlen) {
2876 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2877 memcpy(skb_put(skb, count), data, count);
2878 data += count;
2879 }
2880
2881 len -= skb->len;
2882
2883 /* Continuation fragments (no L2CAP header) */
2884 frag = &skb_shinfo(skb)->frag_list;
2885 while (len) {
2886 count = min_t(unsigned int, conn->mtu, len);
2887
8bcde1f2 2888 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2889 if (!*frag)
2890 goto fail;
2891
2892 memcpy(skb_put(*frag, count), data, count);
2893
2894 len -= count;
2895 data += count;
2896
2897 frag = &(*frag)->next;
2898 }
2899
2900 return skb;
2901
2902fail:
2903 kfree_skb(skb);
2904 return NULL;
2905}
2906
2d792818
GP		 2907static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2908 unsigned long *val)
1da177e4
LT		 2909{
2910 struct l2cap_conf_opt *opt = *ptr;
2911 int len;
2912
2913 len = L2CAP_CONF_OPT_SIZE + opt->len;
2914 *ptr += len;
2915
2916 *type = opt->type;
2917 *olen = opt->len;
2918
2919 switch (opt->len) {
2920 case 1:
2921 *val = *((u8 *) opt->val);
2922 break;
2923
2924 case 2:
bfaaeb3e 2925 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2926 break;
2927
2928 case 4:
bfaaeb3e 2929 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2930 break;
2931
2932 default:
2933 *val = (unsigned long) opt->val;
2934 break;
2935 }
2936
b4400672 2937 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2938 return len;
2939}
2940
1da177e4
LT		 2941static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2942{
2943 struct l2cap_conf_opt *opt = *ptr;
2944
b4400672 2945 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2946
2947 opt->type = type;
2948 opt->len = len;
2949
2950 switch (len) {
2951 case 1:
2952 *((u8 *) opt->val) = val;
2953 break;
2954
2955 case 2:
4f8b691c 2956 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2957 break;
2958
2959 case 4:
4f8b691c 2960 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2961 break;
2962
2963 default:
2964 memcpy(opt->val, (void *) val, len);
2965 break;
2966 }
2967
2968 *ptr += L2CAP_CONF_OPT_SIZE + len;
2969}
2970
f89cef09
AE		 2971static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2972{
2973 struct l2cap_conf_efs efs;
2974
1ec918ce 2975 switch (chan->mode) {
f89cef09
AE		 2976 case L2CAP_MODE_ERTM:
2977 efs.id = chan->local_id;
2978 efs.stype = chan->local_stype;
2979 efs.msdu = cpu_to_le16(chan->local_msdu);
2980 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 2981 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 2982 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 2983 break;
2984
2985 case L2CAP_MODE_STREAMING:
2986 efs.id = 1;
2987 efs.stype = L2CAP_SERV_BESTEFFORT;
2988 efs.msdu = cpu_to_le16(chan->local_msdu);
2989 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2990 efs.acc_lat = 0;
2991 efs.flush_to = 0;
2992 break;
2993
2994 default:
2995 return;
2996 }
2997
2998 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 2999 (unsigned long) &efs);
f89cef09
AE		 3000}
3001
721c4181 3002static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3003{
721c4181 3004 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3005 ack_timer.work);
3006 u16 frames_to_ack;
c1b4f43b 3007
2fb9b3d4
GP		 3008 BT_DBG("chan %p", chan);
3009
6be36555
AE		 3010 l2cap_chan_lock(chan);
3011
0362520b
MM		 3012 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3013 chan->last_acked_seq);
6be36555 3014
0362520b
MM		 3015 if (frames_to_ack)
3016 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3017
0362520b 3018 l2cap_chan_unlock(chan);
09bfb2ee 3019 l2cap_chan_put(chan);
c1b4f43b
GP		 3020}
3021
466f8004 3022int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3023{
3c588192
MM		 3024 int err;
3025
105bdf9e
MM		 3026 chan->next_tx_seq = 0;
3027 chan->expected_tx_seq = 0;
42e5c802 3028 chan->expected_ack_seq = 0;
6a026610 3029 chan->unacked_frames = 0;
42e5c802 3030 chan->buffer_seq = 0;
6a026610 3031 chan->frames_sent = 0;
105bdf9e
MM		 3032 chan->last_acked_seq = 0;
3033 chan->sdu = NULL;
3034 chan->sdu_last_frag = NULL;
3035 chan->sdu_len = 0;
3036
d34c34fb
MM		 3037 skb_queue_head_init(&chan->tx_q);
3038
08333283
MM		 3039 chan->local_amp_id = 0;
3040 chan->move_id = 0;
3041 chan->move_state = L2CAP_MOVE_STABLE;
3042 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3043
105bdf9e
MM		 3044 if (chan->mode != L2CAP_MODE_ERTM)
3045 return 0;
3046
3047 chan->rx_state = L2CAP_RX_STATE_RECV;
3048 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3049
721c4181
GP		 3050 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3051 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3052 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3053
f1c6775b 3054 skb_queue_head_init(&chan->srej_q);
1890d36b 3055
3c588192
MM		 3056 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3057 if (err < 0)
3058 return err;
3059
9dc9affc
MM		 3060 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3061 if (err < 0)
3062 l2cap_seq_list_free(&chan->srej_list);
3063
3064 return err;
0565c1c2
GP		 3065}
3066
f2fcfcd6
GP		 3067static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3068{
3069 switch (mode) {
3070 case L2CAP_MODE_STREAMING:
3071 case L2CAP_MODE_ERTM:
3072 if (l2cap_mode_supported(mode, remote_feat_mask))
3073 return mode;
3074 /* fall through */
3075 default:
3076 return L2CAP_MODE_BASIC;
3077 }
3078}
3079
6327eb98
AE		 3080static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
3081{
3082 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
3083}
3084
f89cef09
AE		 3085static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
3086{
3087 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
3088}
3089
36c86c85
MM		 3090static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3091 struct l2cap_conf_rfc *rfc)
3092{
3093 if (chan->local_amp_id && chan->hs_hcon) {
3094 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3095
3096 /* Class 1 devices have must have ERTM timeouts
3097 * exceeding the Link Supervision Timeout. The
3098 * default Link Supervision Timeout for AMP
3099 * controllers is 10 seconds.
3100 *
3101 * Class 1 devices use 0xffffffff for their
3102 * best-effort flush timeout, so the clamping logic
3103 * will result in a timeout that meets the above
3104 * requirement. ERTM timeouts are 16-bit values, so
3105 * the maximum timeout is 65.535 seconds.
3106 */
3107
3108 /* Convert timeout to milliseconds and round */
3109 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3110
3111 /* This is the recommended formula for class 2 devices
3112 * that start ERTM timers when packets are sent to the
3113 * controller.
3114 */
3115 ertm_to = 3 * ertm_to + 500;
3116
3117 if (ertm_to > 0xffff)
3118 ertm_to = 0xffff;
3119
3120 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3121 rfc->monitor_timeout = rfc->retrans_timeout;
3122 } else {
3123 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3124 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3125 }
3126}
3127
6327eb98
AE		 3128static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3129{
3130 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
2d792818 3131 __l2cap_ews_supported(chan)) {
6327eb98
AE		 3132 /* use extended control field */
3133 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3134 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3135 } else {
6327eb98 3136 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3137 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3138 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3139 }
c20f8e35 3140 chan->ack_win = chan->tx_win;
6327eb98
AE		 3141}
3142
710f9b0a 3143static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3144{
1da177e4 3145 struct l2cap_conf_req *req = data;
0c1bc5c6 3146 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3147 void *ptr = req->data;
c8f79162 3148 u16 size;
1da177e4 3149
49208c9c 3150 BT_DBG("chan %p", chan);
1da177e4 3151
73ffa904 3152 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3153 goto done;
3154
0c1bc5c6 3155 switch (chan->mode) {
f2fcfcd6
GP		 3156 case L2CAP_MODE_STREAMING:
3157 case L2CAP_MODE_ERTM:
c1360a1c 3158 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3159 break;
85eb53c6 3160
f89cef09
AE		 3161 if (__l2cap_efs_supported(chan))
3162 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3163
2ba13ed6 3164 /* fall through */
f2fcfcd6 3165 default:
8c1d787b 3166 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3167 break;
3168 }
3169
3170done:
0c1bc5c6
GP		 3171 if (chan->imtu != L2CAP_DEFAULT_MTU)
3172 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3173
0c1bc5c6 3174 switch (chan->mode) {
65c7c491 3175 case L2CAP_MODE_BASIC:
8c1d787b 3176 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3177 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3178 break;
3179
62547752
GP		 3180 rfc.mode = L2CAP_MODE_BASIC;
3181 rfc.txwin_size = 0;
3182 rfc.max_transmit = 0;
3183 rfc.retrans_timeout = 0;
3184 rfc.monitor_timeout = 0;
3185 rfc.max_pdu_size = 0;
3186
63406504 3187 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3188 (unsigned long) &rfc);
65c7c491
MH		 3189 break;
3190
3191 case L2CAP_MODE_ERTM:
3192 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3193 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3194
3195 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3196
3197 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3198 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3199 L2CAP_FCS_SIZE);
c8f79162 3200 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3201
6327eb98
AE		 3202 l2cap_txwin_setup(chan);
3203
3204 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3205 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3206
63406504 3207 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3208 (unsigned long) &rfc);
63406504 3209
f89cef09
AE		 3210 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3211 l2cap_add_opt_efs(&ptr, chan);
3212
6327eb98
AE		 3213 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3214 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3215 chan->tx_win);
60918918
AE		 3216
3217 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3218 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3219 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3220 chan->fcs = L2CAP_FCS_NONE;
3221 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3222 chan->fcs);
3223 }
f2fcfcd6
GP		 3224 break;
3225
3226 case L2CAP_MODE_STREAMING:
273759e2 3227 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3228 rfc.mode = L2CAP_MODE_STREAMING;
3229 rfc.txwin_size = 0;
3230 rfc.max_transmit = 0;
3231 rfc.retrans_timeout = 0;
3232 rfc.monitor_timeout = 0;
c8f79162
AE		 3233
3234 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3235 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3236 L2CAP_FCS_SIZE);
c8f79162 3237 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3238
63406504 3239 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3240 (unsigned long) &rfc);
63406504 3241
f89cef09
AE		 3242 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3243 l2cap_add_opt_efs(&ptr, chan);
3244
60918918
AE		 3245 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3246 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3247 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3248 chan->fcs = L2CAP_FCS_NONE;
3249 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3250 chan->fcs);
3251 }
65c7c491
MH		 3252 break;
3253 }
1da177e4 3254
fe4128e0 3255 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3256 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3257
3258 return ptr - data;
3259}
3260
73ffa904 3261static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3262{
5dee9e7c
MH		 3263 struct l2cap_conf_rsp *rsp = data;
3264 void *ptr = rsp->data;
73ffa904
GP		 3265 void *req = chan->conf_req;
3266 int len = chan->conf_len;
5dee9e7c
MH		 3267 int type, hint, olen;
3268 unsigned long val;
6464f35f 3269 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3270 struct l2cap_conf_efs efs;
3271 u8 remote_efs = 0;
861d6882 3272 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3273 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3274 u16 size;
1da177e4 3275
73ffa904 3276 BT_DBG("chan %p", chan);
820ae1b8 3277
5dee9e7c
MH		 3278 while (len >= L2CAP_CONF_OPT_SIZE) {
3279 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3280
589d2746 3281 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3282 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3283
3284 switch (type) {
3285 case L2CAP_CONF_MTU:
861d6882 3286 mtu = val;
5dee9e7c
MH		 3287 break;
3288
3289 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3290 chan->flush_to = val;
5dee9e7c
MH		 3291 break;
3292
3293 case L2CAP_CONF_QOS:
3294 break;
3295
6464f35f
MH		 3296 case L2CAP_CONF_RFC:
3297 if (olen == sizeof(rfc))
3298 memcpy(&rfc, (void *) val, olen);
3299 break;
3300
fcc203c3
GP		 3301 case L2CAP_CONF_FCS:
3302 if (val == L2CAP_FCS_NONE)
f2592d3e 3303 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3304 break;
fcc203c3 3305
42dceae2
AE		 3306 case L2CAP_CONF_EFS:
3307 remote_efs = 1;
3308 if (olen == sizeof(efs))
3309 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3310 break;
3311
6327eb98
AE		 3312 case L2CAP_CONF_EWS:
3313 if (!enable_hs)
3314 return -ECONNREFUSED;
fcc203c3 3315
6327eb98
AE		 3316 set_bit(FLAG_EXT_CTRL, &chan->flags);
3317 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3318 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3319 chan->remote_tx_win = val;
fcc203c3
GP		 3320 break;
3321
5dee9e7c
MH		 3322 default:
3323 if (hint)
3324 break;
3325
3326 result = L2CAP_CONF_UNKNOWN;
3327 *((u8 *) ptr++) = type;
3328 break;
3329 }
3330 }
3331
73ffa904 3332 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3333 goto done;
3334
0c1bc5c6 3335 switch (chan->mode) {
f2fcfcd6
GP		 3336 case L2CAP_MODE_STREAMING:
3337 case L2CAP_MODE_ERTM:
c1360a1c 3338 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3339 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3340 chan->conn->feat_mask);
85eb53c6
GP		 3341 break;
3342 }
3343
42dceae2
AE		 3344 if (remote_efs) {
3345 if (__l2cap_efs_supported(chan))
3346 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3347 else
3348 return -ECONNREFUSED;
3349 }
3350
0c1bc5c6 3351 if (chan->mode != rfc.mode)
f2fcfcd6 3352 return -ECONNREFUSED;
742e519b 3353
f2fcfcd6 3354 break;
f2fcfcd6
GP		 3355 }
3356
3357done:
0c1bc5c6 3358 if (chan->mode != rfc.mode) {
f2fcfcd6 3359 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3360 rfc.mode = chan->mode;
f2fcfcd6 3361
73ffa904 3362 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3363 return -ECONNREFUSED;
3364
2d792818
GP		 3365 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3366 (unsigned long) &rfc);
f2fcfcd6
GP		 3367 }
3368
5dee9e7c
MH		 3369 if (result == L2CAP_CONF_SUCCESS) {
3370 /* Configure output options and let the other side know
3371 * which ones we don't like. */
3372
f2fcfcd6
GP		 3373 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3374 result = L2CAP_CONF_UNACCEPT;
3375 else {
0c1bc5c6 3376 chan->omtu = mtu;
c1360a1c 3377 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3378 }
0c1bc5c6 3379 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3380
42dceae2
AE		 3381 if (remote_efs) {
3382 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3383 efs.stype != L2CAP_SERV_NOTRAFIC &&
3384 efs.stype != chan->local_stype) {
42dceae2
AE		 3385
3386 result = L2CAP_CONF_UNACCEPT;
3387
3388 if (chan->num_conf_req >= 1)
3389 return -ECONNREFUSED;
3390
3391 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3392 sizeof(efs),
3393 (unsigned long) &efs);
0e8b207e 3394 } else {
3e6b3b95 3395 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3396 result = L2CAP_CONF_PENDING;
3397 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3398 }
3399 }
3400
f2fcfcd6
GP		 3401 switch (rfc.mode) {
3402 case L2CAP_MODE_BASIC:
47d1ec61 3403 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3404 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3405 break;
3406
3407 case L2CAP_MODE_ERTM:
6327eb98
AE		 3408 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3409 chan->remote_tx_win = rfc.txwin_size;
3410 else
3411 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3412
2c03a7a4 3413 chan->remote_max_tx = rfc.max_transmit;
1c762159 3414
c8f79162 3415 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3416 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3417 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3418 rfc.max_pdu_size = cpu_to_le16(size);
3419 chan->remote_mps = size;
f2fcfcd6 3420
36c86c85 3421 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3422
c1360a1c 3423 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3424
3425 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3426 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3427
42dceae2
AE		 3428 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3429 chan->remote_id = efs.id;
3430 chan->remote_stype = efs.stype;
3431 chan->remote_msdu = le16_to_cpu(efs.msdu);
3432 chan->remote_flush_to =
2d792818 3433 le32_to_cpu(efs.flush_to);
42dceae2 3434 chan->remote_acc_lat =
2d792818 3435 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3436 chan->remote_sdu_itime =
3437 le32_to_cpu(efs.sdu_itime);
3438 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3439 sizeof(efs),
3440 (unsigned long) &efs);
42dceae2 3441 }
f2fcfcd6
GP		 3442 break;
3443
3444 case L2CAP_MODE_STREAMING:
c8f79162 3445 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3446 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3447 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3448 rfc.max_pdu_size = cpu_to_le16(size);
3449 chan->remote_mps = size;
f2fcfcd6 3450
c1360a1c 3451 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3452
2d792818
GP		 3453 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3454 (unsigned long) &rfc);
68ae6639 3455
f2fcfcd6
GP		 3456 break;
3457
3458 default:
5dee9e7c 3459 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3460
6464f35f 3461 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3462 rfc.mode = chan->mode;
f2fcfcd6 3463 }
6464f35f 3464
f2fcfcd6 3465 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3466 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3467 }
fe4128e0 3468 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3469 rsp->result = cpu_to_le16(result);
59e54bd1 3470 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3471
3472 return ptr - data;
1da177e4
LT		 3473}
3474
2d792818
GP		 3475static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3476 void *data, u16 *result)
f2fcfcd6 3477{
f2fcfcd6
GP		 3478 struct l2cap_conf_req *req = data;
3479 void *ptr = req->data;
3480 int type, olen;
3481 unsigned long val;
36e999a8 3482 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3483 struct l2cap_conf_efs efs;
f2fcfcd6 3484
fe4128e0 3485 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3486
3487 while (len >= L2CAP_CONF_OPT_SIZE) {
3488 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3489
3490 switch (type) {
3491 case L2CAP_CONF_MTU:
3492 if (val < L2CAP_DEFAULT_MIN_MTU) {
3493 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3494 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3495 } else
0c1bc5c6
GP		 3496 chan->imtu = val;
3497 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3498 break;
3499
3500 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3501 chan->flush_to = val;
f2fcfcd6 3502 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3503 2, chan->flush_to);
f2fcfcd6
GP		 3504 break;
3505
3506 case L2CAP_CONF_RFC:
3507 if (olen == sizeof(rfc))
3508 memcpy(&rfc, (void *)val, olen);
3509
c1360a1c 3510 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3511 rfc.mode != chan->mode)
f2fcfcd6
GP		 3512 return -ECONNREFUSED;
3513
47d1ec61 3514 chan->fcs = 0;
f2fcfcd6
GP		 3515
3516 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3517 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3518 break;
6327eb98
AE		 3519
3520 case L2CAP_CONF_EWS:
c20f8e35 3521 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3522 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3523 chan->tx_win);
6327eb98 3524 break;
66af7aaf
AE		 3525
3526 case L2CAP_CONF_EFS:
3527 if (olen == sizeof(efs))
3528 memcpy(&efs, (void *)val, olen);
3529
3530 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3531 efs.stype != L2CAP_SERV_NOTRAFIC &&
3532 efs.stype != chan->local_stype)
66af7aaf
AE		 3533 return -ECONNREFUSED;
3534
2d792818
GP		 3535 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3536 (unsigned long) &efs);
66af7aaf 3537 break;
cbabee78
AE		 3538
3539 case L2CAP_CONF_FCS:
3540 if (*result == L2CAP_CONF_PENDING)
3541 if (val == L2CAP_FCS_NONE)
f2592d3e 3542 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3543 &chan->conf_state);
3544 break;
f2fcfcd6
GP		 3545 }
3546 }
3547
0c1bc5c6 3548 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3549 return -ECONNREFUSED;
3550
0c1bc5c6 3551 chan->mode = rfc.mode;
6c2ea7a8 3552
0e8b207e 3553 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3554 switch (rfc.mode) {
3555 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3556 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3557 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3558 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3559 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3560 chan->ack_win = min_t(u16, chan->ack_win,
3561 rfc.txwin_size);
66af7aaf
AE		 3562
3563 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3564 chan->local_msdu = le16_to_cpu(efs.msdu);
3565 chan->local_sdu_itime =
2d792818 3566 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3567 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3568 chan->local_flush_to =
2d792818 3569 le32_to_cpu(efs.flush_to);
66af7aaf 3570 }
f2fcfcd6 3571 break;
66af7aaf 3572
f2fcfcd6 3573 case L2CAP_MODE_STREAMING:
47d1ec61 3574 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3575 }
3576 }
3577
fe4128e0 3578 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3579 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3580
3581 return ptr - data;
3582}
3583
2d792818
GP		 3584static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3585 u16 result, u16 flags)
1da177e4
LT		 3586{
3587 struct l2cap_conf_rsp *rsp = data;
3588 void *ptr = rsp->data;
1da177e4 3589
fe4128e0 3590 BT_DBG("chan %p", chan);
1da177e4 3591
fe4128e0 3592 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3593 rsp->result = cpu_to_le16(result);
aca3192c 3594 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3595
3596 return ptr - data;
3597}
3598
8c1d787b 3599void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3600{
3601 struct l2cap_conn_rsp rsp;
8c1d787b 3602 struct l2cap_conn *conn = chan->conn;
710f9b0a 3603 u8 buf[128];
439f34ac 3604 u8 rsp_code;
710f9b0a 3605
fe4128e0
GP		 3606 rsp.scid = cpu_to_le16(chan->dcid);
3607 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3608 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3609 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3610
3611 if (chan->hs_hcon)
3612 rsp_code = L2CAP_CREATE_CHAN_RSP;
3613 else
3614 rsp_code = L2CAP_CONN_RSP;
3615
3616 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3617
3618 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3619
c1360a1c 3620 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3621 return;
3622
710f9b0a 3623 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3624 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3625 chan->num_conf_req++;
3626}
3627
47d1ec61 3628static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3629{
7b1c0049
GP		 3630 int type, olen;
3631 unsigned long val;
c20f8e35
MM		 3632 /* Use sane default values in case a misbehaving remote device
3633 * did not send an RFC or extended window size option.
3634 */
3635 u16 txwin_ext = chan->ack_win;
3636 struct l2cap_conf_rfc rfc = {
3637 .mode = chan->mode,
3638 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3639 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3640 .max_pdu_size = cpu_to_le16(chan->imtu),
3641 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3642 };
7b1c0049 3643
47d1ec61 3644 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3645
0c1bc5c6 3646 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3647 return;
3648
3649 while (len >= L2CAP_CONF_OPT_SIZE) {
3650 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3651
c20f8e35
MM		 3652 switch (type) {
3653 case L2CAP_CONF_RFC:
3654 if (olen == sizeof(rfc))
3655 memcpy(&rfc, (void *)val, olen);
8f321f85 3656 break;
c20f8e35
MM		 3657 case L2CAP_CONF_EWS:
3658 txwin_ext = val;
3659 break;
3660 }
7b1c0049
GP		 3661 }
3662
7b1c0049
GP		 3663 switch (rfc.mode) {
3664 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3665 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3666 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3667 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3668 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3669 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3670 else
3671 chan->ack_win = min_t(u16, chan->ack_win,
3672 rfc.txwin_size);
7b1c0049
GP		 3673 break;
3674 case L2CAP_MODE_STREAMING:
47d1ec61 3675 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3676 }
3677}
3678
2d792818 3679static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3680 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3681 u8 *data)
4e8402a3 3682{
e2fd318e 3683 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3684
cb3b3152
JH		 3685 if (cmd_len < sizeof(*rej))
3686 return -EPROTO;
3687
e2fd318e 3688 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3689 return 0;
3690
3691 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3692 cmd->ident == conn->info_ident) {
17cd3f37 3693 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3694
3695 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3696 conn->info_ident = 0;
984947dc 3697
4e8402a3
MH		 3698 l2cap_conn_start(conn);
3699 }
3700
3701 return 0;
3702}
3703
1700915f
MM		 3704static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3705 struct l2cap_cmd_hdr *cmd,
3706 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3707{
1da177e4
LT		 3708 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3709 struct l2cap_conn_rsp rsp;
23691d75 3710 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3711 struct sock *parent, *sk = NULL;
e7c29cb1 3712 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3713
3714 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3715 __le16 psm = req->psm;
1da177e4 3716
097db76c 3717 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3718
3719 /* Check if we have socket listening on psm */
c2287681 3720 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 3721 if (!pchan) {
1da177e4
LT		 3722 result = L2CAP_CR_BAD_PSM;
3723 goto sendresp;
3724 }
3725
23691d75
GP		 3726 parent = pchan->sk;
3727
3df91ea2 3728 mutex_lock(&conn->chan_lock);
aa2ac881 3729 lock_sock(parent);
e0f0cb56 3730
e7c29cb1 3731 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3732 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3733 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3734 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3735 result = L2CAP_CR_SEC_BLOCK;
3736 goto response;
3737 }
3738
1da177e4
LT		 3739 result = L2CAP_CR_NO_MEM;
3740
2dfa1003
GP		 3741 /* Check if we already have channel with that dcid */
3742 if (__l2cap_get_chan_by_dcid(conn, scid))
3743 goto response;
3744
80b98027 3745 chan = pchan->ops->new_connection(pchan);
80808e43 3746 if (!chan)
1da177e4
LT		 3747 goto response;
3748
80808e43
GP		 3749 sk = chan->sk;
3750
1da177e4
LT		 3751 hci_conn_hold(conn->hcon);
3752
1da177e4
LT		 3753 bacpy(&bt_sk(sk)->src, conn->src);
3754 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3755 chan->psm = psm;
3756 chan->dcid = scid;
1700915f 3757 chan->local_amp_id = amp_id;
1da177e4 3758
6be36555 3759 __l2cap_chan_add(conn, chan);
48454079 3760
fe4128e0 3761 dcid = chan->scid;
1da177e4 3762
c9b66675 3763 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3764
fc7f8a7e 3765 chan->ident = cmd->ident;
1da177e4 3766
984947dc 3767 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3768 if (l2cap_chan_check_security(chan)) {
c5daa683 3769 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
0e587be7 3770 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3771 result = L2CAP_CR_PEND;
3772 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3773 chan->ops->defer(chan);
f66dc81f 3774 } else {
1700915f
MM		 3775 /* Force pending result for AMP controllers.
3776 * The connection will succeed after the
3777 * physical link is up.
3778 */
3779 if (amp_id) {
3780 __l2cap_state_change(chan, BT_CONNECT2);
3781 result = L2CAP_CR_PEND;
3782 } else {
3783 __l2cap_state_change(chan, BT_CONFIG);
3784 result = L2CAP_CR_SUCCESS;
3785 }
f66dc81f
MH		 3786 status = L2CAP_CS_NO_INFO;
3787 }
79d554a6 3788 } else {
0e587be7 3789 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3790 result = L2CAP_CR_PEND;
3791 status = L2CAP_CS_AUTHEN_PEND;
3792 }
3793 } else {
0e587be7 3794 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3795 result = L2CAP_CR_PEND;
3796 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3797 }
3798
1da177e4 3799response:
aa2ac881 3800 release_sock(parent);
3df91ea2 3801 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3802
3803sendresp:
aca3192c
YH		 3804 rsp.scid = cpu_to_le16(scid);
3805 rsp.dcid = cpu_to_le16(dcid);
3806 rsp.result = cpu_to_le16(result);
3807 rsp.status = cpu_to_le16(status);
4c89b6aa 3808 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3809
3810 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3811 struct l2cap_info_req info;
ac73498c 3812 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3813
3814 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3815 conn->info_ident = l2cap_get_ident(conn);
3816
ba13ccd9 3817 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3818
2d792818
GP		 3819 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3820 sizeof(info), &info);
79d554a6
MH		 3821 }
3822
c1360a1c 3823 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3824 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3825 u8 buf[128];
c1360a1c 3826 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3827 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3828 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3829 chan->num_conf_req++;
e9aeb2dd 3830 }
1700915f
MM		 3831
3832 return chan;
4c89b6aa 3833}
e9aeb2dd 3834
4c89b6aa 3835static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3836 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3837{
7b064eda
JK		 3838 struct hci_dev *hdev = conn->hcon->hdev;
3839 struct hci_conn *hcon = conn->hcon;
3840
cb3b3152
JH		 3841 if (cmd_len < sizeof(struct l2cap_conn_req))
3842 return -EPROTO;
3843
7b064eda
JK		 3844 hci_dev_lock(hdev);
3845 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3846 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3847 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3848 hcon->dst_type, 0, NULL, 0,
3849 hcon->dev_class);
3850 hci_dev_unlock(hdev);
3851
300229f9 3852 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3853 return 0;
3854}
3855
5909cf30 3856static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3857 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3858 u8 *data)
1da177e4
LT		 3859{
3860 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3861 u16 scid, dcid, result, status;
48454079 3862 struct l2cap_chan *chan;
1da177e4 3863 u8 req[128];
3df91ea2 3864 int err;
1da177e4 3865
cb3b3152
JH		 3866 if (cmd_len < sizeof(*rsp))
3867 return -EPROTO;
3868
1da177e4
LT		 3869 scid = __le16_to_cpu(rsp->scid);
3870 dcid = __le16_to_cpu(rsp->dcid);
3871 result = __le16_to_cpu(rsp->result);
3872 status = __le16_to_cpu(rsp->status);
3873
1b009c98 3874 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3875 dcid, scid, result, status);
1da177e4 3876
3df91ea2
AE		 3877 mutex_lock(&conn->chan_lock);
3878
1da177e4 3879 if (scid) {
3df91ea2
AE		 3880 chan = __l2cap_get_chan_by_scid(conn, scid);
3881 if (!chan) {
3882 err = -EFAULT;
3883 goto unlock;
3884 }
1da177e4 3885 } else {
3df91ea2
AE		 3886 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3887 if (!chan) {
3888 err = -EFAULT;
3889 goto unlock;
3890 }
1da177e4
LT		 3891 }
3892
3df91ea2
AE		 3893 err = 0;
3894
6be36555 3895 l2cap_chan_lock(chan);
48454079 3896
1da177e4
LT		 3897 switch (result) {
3898 case L2CAP_CR_SUCCESS:
89bc500e 3899 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3900 chan->ident = 0;
fe4128e0 3901 chan->dcid = dcid;
c1360a1c 3902 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3903
c1360a1c 3904 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3905 break;
3906
1da177e4 3907 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3908 l2cap_build_conf_req(chan, req), req);
73ffa904 3909 chan->num_conf_req++;
1da177e4
LT		 3910 break;
3911
3912 case L2CAP_CR_PEND:
c1360a1c 3913 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3914 break;
3915
3916 default:
48454079 3917 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3918 break;
3919 }
3920
6be36555 3921 l2cap_chan_unlock(chan);
3df91ea2
AE		 3922
3923unlock:
3924 mutex_unlock(&conn->chan_lock);
3925
3926 return err;
1da177e4
LT		 3927}
3928
47d1ec61 3929static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3930{
3931 /* FCS is enabled only in ERTM or streaming mode, if one or both
3932 * sides request it.
3933 */
0c1bc5c6 3934 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3935 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3936 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3937 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3938}
3939
29d8a590
AE		 3940static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3941 u8 ident, u16 flags)
3942{
3943 struct l2cap_conn *conn = chan->conn;
3944
3945 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3946 flags);
3947
3948 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3949 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3950
3951 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3952 l2cap_build_conf_rsp(chan, data,
3953 L2CAP_CONF_SUCCESS, flags), data);
3954}
3955
2d792818
GP		 3956static inline int l2cap_config_req(struct l2cap_conn *conn,
3957 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3958 u8 *data)
1da177e4
LT		 3959{
3960 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3961 u16 dcid, flags;
3962 u8 rsp[64];
48454079 3963 struct l2cap_chan *chan;
3c588192 3964 int len, err = 0;
1da177e4 3965
cb3b3152
JH		 3966 if (cmd_len < sizeof(*req))
3967 return -EPROTO;
3968
1da177e4
LT		 3969 dcid = __le16_to_cpu(req->dcid);
3970 flags = __le16_to_cpu(req->flags);
3971
3972 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3973
baa7e1fa 3974 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3975 if (!chan)
1da177e4
LT		 3976 return -ENOENT;
3977
033b1142 3978 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3979 struct l2cap_cmd_rej_cid rej;
3980
ac73498c 3981 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
e2fd318e
IK		 3982 rej.scid = cpu_to_le16(chan->scid);
3983 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3984
df6bd743 3985 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2d792818 3986 sizeof(rej), &rej);
354f60a9 3987 goto unlock;
df6bd743 3988 }
354f60a9 3989
5dee9e7c 3990 /* Reject if config buffer is too small. */
88219a0f 3991 len = cmd_len - sizeof(*req);
cb3b3152 3992 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3993 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 3994 l2cap_build_conf_rsp(chan, rsp,
3995 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 3996 goto unlock;
3997 }
3998
3999 /* Store config. */
73ffa904
GP		 4000 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4001 chan->conf_len += len;
1da177e4 4002
59e54bd1 4003 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4004 /* Incomplete config. Send empty response. */
4005 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4006 l2cap_build_conf_rsp(chan, rsp,
4007 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4008 goto unlock;
4009 }
4010
4011 /* Complete config. */
73ffa904 4012 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4013 if (len < 0) {
5e4e3972 4014 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4015 goto unlock;
f2fcfcd6 4016 }
1da177e4 4017
1500109b 4018 chan->ident = cmd->ident;
5dee9e7c 4019 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4020 chan->num_conf_rsp++;
5dee9e7c 4021
5dee9e7c 4022 /* Reset config buffer. */
73ffa904 4023 chan->conf_len = 0;
5dee9e7c 4024
c1360a1c 4025 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4026 goto unlock;
4027
c1360a1c 4028 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4029 set_default_fcs(chan);
fcc203c3 4030
105bdf9e
MM		 4031 if (chan->mode == L2CAP_MODE_ERTM ||
4032 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4033 err = l2cap_ertm_init(chan);
4034
4035 if (err < 0)
5e4e3972 4036 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4037 else
4038 l2cap_chan_ready(chan);
0565c1c2 4039
876d9484
MH		 4040 goto unlock;
4041 }
4042
c1360a1c 4043 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4044 u8 buf[64];
1da177e4 4045 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4046 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4047 chan->num_conf_req++;
1da177e4
LT		 4048 }
4049
0e8b207e
AE		 4050 /* Got Conf Rsp PENDING from remote side and asume we sent
4051 Conf Rsp PENDING in the code above */
4052 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4053 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4054
4055 /* check compatibility */
4056
79de886d 4057 /* Send rsp for BR/EDR channel */
f351bc72 4058 if (!chan->hs_hcon)
79de886d
AE		 4059 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4060 else
4061 chan->ident = cmd->ident;
0e8b207e
AE		 4062 }
4063
1da177e4 4064unlock:
6be36555 4065 l2cap_chan_unlock(chan);
3c588192 4066 return err;
1da177e4
LT		 4067}
4068
2d792818 4069static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4070 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4071 u8 *data)
1da177e4
LT		 4072{
4073 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4074 u16 scid, flags, result;
48454079 4075 struct l2cap_chan *chan;
cb3b3152 4076 int len = cmd_len - sizeof(*rsp);
3c588192 4077 int err = 0;
1da177e4 4078
cb3b3152
JH		 4079 if (cmd_len < sizeof(*rsp))
4080 return -EPROTO;
4081
1da177e4
LT		 4082 scid = __le16_to_cpu(rsp->scid);
4083 flags = __le16_to_cpu(rsp->flags);
4084 result = __le16_to_cpu(rsp->result);
4085
61386cba
AE		 4086 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4087 result, len);
1da177e4 4088
baa7e1fa 4089 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4090 if (!chan)
1da177e4
LT		 4091 return 0;
4092
4093 switch (result) {
4094 case L2CAP_CONF_SUCCESS:
47d1ec61 4095 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4096 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4097 break;
4098
0e8b207e
AE		 4099 case L2CAP_CONF_PENDING:
4100 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4101
4102 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4103 char buf[64];
4104
4105 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4106 buf, &result);
0e8b207e 4107 if (len < 0) {
5e4e3972 4108 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4109 goto done;
4110 }
4111
f351bc72 4112 if (!chan->hs_hcon) {
79de886d
AE		 4113 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4114 0);
5ce66b59
AE		 4115 } else {
4116 if (l2cap_check_efs(chan)) {
4117 amp_create_logical_link(chan);
4118 chan->ident = cmd->ident;
4119 }
4120 }
0e8b207e
AE		 4121 }
4122 goto done;
4123
1da177e4 4124 case L2CAP_CONF_UNACCEPT:
73ffa904 4125 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4126 char req[64];
4127
c2c77ec8 4128 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4129 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4130 goto done;
4131 }
4132
f2fcfcd6
GP		 4133 /* throw out any old stored conf requests */
4134 result = L2CAP_CONF_SUCCESS;
b4450035 4135 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4136 req, &result);
f2fcfcd6 4137 if (len < 0) {
5e4e3972 4138 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4139 goto done;
4140 }
4141
4142 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4143 L2CAP_CONF_REQ, len, req);
73ffa904 4144 chan->num_conf_req++;
f2fcfcd6
GP		 4145 if (result != L2CAP_CONF_SUCCESS)
4146 goto done;
4147 break;
1da177e4
LT		 4148 }
4149
8e87d142 4150 default:
6be36555 4151 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4152
ba13ccd9 4153 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4154 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4155 goto done;
4156 }
4157
59e54bd1 4158 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4159 goto done;
4160
c1360a1c 4161 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4162
c1360a1c 4163 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4164 set_default_fcs(chan);
fcc203c3 4165
105bdf9e
MM		 4166 if (chan->mode == L2CAP_MODE_ERTM ||
4167 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4168 err = l2cap_ertm_init(chan);
0565c1c2 4169
3c588192 4170 if (err < 0)
5e4e3972 4171 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4172 else
4173 l2cap_chan_ready(chan);
1da177e4
LT		 4174 }
4175
4176done:
6be36555 4177 l2cap_chan_unlock(chan);
3c588192 4178 return err;
1da177e4
LT		 4179}
4180
2d792818 4181static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4182 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4183 u8 *data)
1da177e4
LT		 4184{
4185 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4186 struct l2cap_disconn_rsp rsp;
4187 u16 dcid, scid;
48454079 4188 struct l2cap_chan *chan;
1da177e4
LT		 4189 struct sock *sk;
4190
cb3b3152
JH		 4191 if (cmd_len != sizeof(*req))
4192 return -EPROTO;
4193
1da177e4
LT		 4194 scid = __le16_to_cpu(req->scid);
4195 dcid = __le16_to_cpu(req->dcid);
4196
4197 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4198
3df91ea2
AE		 4199 mutex_lock(&conn->chan_lock);
4200
4201 chan = __l2cap_get_chan_by_scid(conn, dcid);
4202 if (!chan) {
4203 mutex_unlock(&conn->chan_lock);
1da177e4 4204 return 0;
3df91ea2 4205 }
1da177e4 4206
6be36555
AE		 4207 l2cap_chan_lock(chan);
4208
48454079
GP		 4209 sk = chan->sk;
4210
fe4128e0
GP		 4211 rsp.dcid = cpu_to_le16(chan->scid);
4212 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4213 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4214
6be36555 4215 lock_sock(sk);
1da177e4 4216 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 4217 release_sock(sk);
1da177e4 4218
61d6ef3e 4219 l2cap_chan_hold(chan);
48454079 4220 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4221
4222 l2cap_chan_unlock(chan);
1da177e4 4223
80b98027 4224 chan->ops->close(chan);
61d6ef3e 4225 l2cap_chan_put(chan);
3df91ea2
AE		 4226
4227 mutex_unlock(&conn->chan_lock);
4228
1da177e4
LT		 4229 return 0;
4230}
4231
2d792818 4232static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4233 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4234 u8 *data)
1da177e4
LT		 4235{
4236 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4237 u16 dcid, scid;
48454079 4238 struct l2cap_chan *chan;
1da177e4 4239
cb3b3152
JH		 4240 if (cmd_len != sizeof(*rsp))
4241 return -EPROTO;
4242
1da177e4
LT		 4243 scid = __le16_to_cpu(rsp->scid);
4244 dcid = __le16_to_cpu(rsp->dcid);
4245
4246 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4247
3df91ea2
AE		 4248 mutex_lock(&conn->chan_lock);
4249
4250 chan = __l2cap_get_chan_by_scid(conn, scid);
4251 if (!chan) {
4252 mutex_unlock(&conn->chan_lock);
1da177e4 4253 return 0;
3df91ea2 4254 }
1da177e4 4255
6be36555 4256 l2cap_chan_lock(chan);
48454079 4257
61d6ef3e 4258 l2cap_chan_hold(chan);
48454079 4259 l2cap_chan_del(chan, 0);
6be36555
AE		 4260
4261 l2cap_chan_unlock(chan);
1da177e4 4262
80b98027 4263 chan->ops->close(chan);
61d6ef3e 4264 l2cap_chan_put(chan);
3df91ea2
AE		 4265
4266 mutex_unlock(&conn->chan_lock);
4267
1da177e4
LT		 4268 return 0;
4269}
4270
2d792818 4271static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4272 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4273 u8 *data)
1da177e4
LT		 4274{
4275 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4276 u16 type;
4277
cb3b3152
JH		 4278 if (cmd_len != sizeof(*req))
4279 return -EPROTO;
4280
1da177e4
LT		 4281 type = __le16_to_cpu(req->type);
4282
4283 BT_DBG("type 0x%4.4x", type);
4284
f0709e03
MH		 4285 if (type == L2CAP_IT_FEAT_MASK) {
4286 u8 buf[8];
44dd46de 4287 u32 feat_mask = l2cap_feat_mask;
f0709e03 4288 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4289 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4290 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4291 if (!disable_ertm)
fcc203c3 4292 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4293 | L2CAP_FEAT_FCS;
a5fd6f30 4294 if (enable_hs)
6327eb98 4295 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4296 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4297
1b7bf4ed 4298 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4299 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4300 buf);
e1027a7c
MH		 4301 } else if (type == L2CAP_IT_FIXED_CHAN) {
4302 u8 buf[12];
4303 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 4304
4305 if (enable_hs)
4306 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4307 else
4308 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4309
ac73498c
AE		 4310 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4311 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4312 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4313 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4314 buf);
f0709e03
MH		 4315 } else {
4316 struct l2cap_info_rsp rsp;
4317 rsp.type = cpu_to_le16(type);
ac73498c 4318 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4319 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4320 &rsp);
f0709e03 4321 }
1da177e4
LT		 4322
4323 return 0;
4324}
4325
2d792818 4326static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4327 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4328 u8 *data)
1da177e4
LT		 4329{
4330 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4331 u16 type, result;
4332
cb3b3152
JH		 4333 if (cmd_len != sizeof(*rsp))
4334 return -EPROTO;
4335
1da177e4
LT		 4336 type = __le16_to_cpu(rsp->type);
4337 result = __le16_to_cpu(rsp->result);
4338
4339 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4340
e90165be
AE		 4341 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4342 if (cmd->ident != conn->info_ident ||
2d792818 4343 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4344 return 0;
4345
17cd3f37 4346 cancel_delayed_work(&conn->info_timer);
4e8402a3 4347
adb08ede
VT		 4348 if (result != L2CAP_IR_SUCCESS) {
4349 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4350 conn->info_ident = 0;
4351
4352 l2cap_conn_start(conn);
4353
4354 return 0;
4355 }
4356
978c93b9
AE		 4357 switch (type) {
4358 case L2CAP_IT_FEAT_MASK:
83985319 4359 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4360
47ec1dcd 4361 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4362 struct l2cap_info_req req;
ac73498c 4363 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4364
4365 conn->info_ident = l2cap_get_ident(conn);
4366
4367 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4368 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4369 } else {
4370 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4371 conn->info_ident = 0;
4372
4373 l2cap_conn_start(conn);
4374 }
978c93b9
AE		 4375 break;
4376
4377 case L2CAP_IT_FIXED_CHAN:
4378 conn->fixed_chan_mask = rsp->data[0];
984947dc 4379 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4380 conn->info_ident = 0;
984947dc
MH		 4381
4382 l2cap_conn_start(conn);
978c93b9 4383 break;
984947dc 4384 }
4e8402a3 4385
1da177e4
LT		 4386 return 0;
4387}
4388
1700915f
MM		 4389static int l2cap_create_channel_req(struct l2cap_conn *conn,
4390 struct l2cap_cmd_hdr *cmd,
4391 u16 cmd_len, void *data)
f94ff6ff
MM		 4392{
4393 struct l2cap_create_chan_req *req = data;
6e1df6a6 4394 struct l2cap_create_chan_rsp rsp;
1700915f 4395 struct l2cap_chan *chan;
6e1df6a6 4396 struct hci_dev *hdev;
f94ff6ff
MM		 4397 u16 psm, scid;
4398
4399 if (cmd_len != sizeof(*req))
4400 return -EPROTO;
4401
4402 if (!enable_hs)
4403 return -EINVAL;
4404
4405 psm = le16_to_cpu(req->psm);
4406 scid = le16_to_cpu(req->scid);
4407
ad0ac6ca 4408 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4409
6e1df6a6
AE		 4410 /* For controller id 0 make BR/EDR connection */
4411 if (req->amp_id == HCI_BREDR_ID) {
4412 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4413 req->amp_id);
4414 return 0;
4415 }
1700915f 4416
6e1df6a6
AE		 4417 /* Validate AMP controller id */
4418 hdev = hci_dev_get(req->amp_id);
4419 if (!hdev)
4420 goto error;
1700915f 4421
6e1df6a6
AE		 4422 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4423 hci_dev_put(hdev);
4424 goto error;
4425 }
1700915f 4426
6e1df6a6
AE		 4427 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4428 req->amp_id);
4429 if (chan) {
4430 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4431 struct hci_conn *hs_hcon;
1700915f 4432
6e1df6a6
AE		 4433 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst);
4434 if (!hs_hcon) {
4435 hci_dev_put(hdev);
4436 return -EFAULT;
1700915f
MM		 4437 }
4438
6e1df6a6
AE		 4439 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4440
6e1df6a6
AE		 4441 mgr->bredr_chan = chan;
4442 chan->hs_hcon = hs_hcon;
fd45bf4c 4443 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4444 conn->mtu = hdev->block_mtu;
1700915f 4445 }
f94ff6ff 4446
6e1df6a6 4447 hci_dev_put(hdev);
f94ff6ff
MM		 4448
4449 return 0;
6e1df6a6
AE		 4450
4451error:
4452 rsp.dcid = 0;
4453 rsp.scid = cpu_to_le16(scid);
4454 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4455 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4456
4457 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4458 sizeof(rsp), &rsp);
4459
4460 return -EFAULT;
f94ff6ff
MM		 4461}
4462
8eb200bd
MM		 4463static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4464{
4465 struct l2cap_move_chan_req req;
4466 u8 ident;
4467
4468 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4469
4470 ident = l2cap_get_ident(chan->conn);
4471 chan->ident = ident;
4472
4473 req.icid = cpu_to_le16(chan->scid);
4474 req.dest_amp_id = dest_amp_id;
4475
4476 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4477 &req);
4478
4479 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4480}
4481
1500109b 4482static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4483{
4484 struct l2cap_move_chan_rsp rsp;
4485
1500109b 4486 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4487
1500109b 4488 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4489 rsp.result = cpu_to_le16(result);
4490
1500109b
MM		 4491 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4492 sizeof(rsp), &rsp);
8d5a04a1
MM		 4493}
4494
5b155ef9 4495static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4496{
4497 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4498
5b155ef9 4499 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4500
5b155ef9 4501 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4502
5b155ef9 4503 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4504 cfm.result = cpu_to_le16(result);
4505
5b155ef9
MM		 4506 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4507 sizeof(cfm), &cfm);
4508
4509 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4510}
4511
4512static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4513{
4514 struct l2cap_move_chan_cfm cfm;
4515
4516 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4517
4518 cfm.icid = cpu_to_le16(icid);
4519 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4520
4521 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4522 sizeof(cfm), &cfm);
8d5a04a1
MM		 4523}
4524
4525static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4526 u16 icid)
8d5a04a1
MM		 4527{
4528 struct l2cap_move_chan_cfm_rsp rsp;
4529
ad0ac6ca 4530 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4531
4532 rsp.icid = cpu_to_le16(icid);
4533 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4534}
4535
5f3847a4
MM		 4536static void __release_logical_link(struct l2cap_chan *chan)
4537{
4538 chan->hs_hchan = NULL;
4539 chan->hs_hcon = NULL;
4540
4541 /* Placeholder - release the logical link */
4542}
4543
1500109b
MM		 4544static void l2cap_logical_fail(struct l2cap_chan *chan)
4545{
4546 /* Logical link setup failed */
4547 if (chan->state != BT_CONNECTED) {
4548 /* Create channel failure, disconnect */
5e4e3972 4549 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4550 return;
4551 }
4552
4553 switch (chan->move_role) {
4554 case L2CAP_MOVE_ROLE_RESPONDER:
4555 l2cap_move_done(chan);
4556 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4557 break;
4558 case L2CAP_MOVE_ROLE_INITIATOR:
4559 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4560 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4561 /* Remote has only sent pending or
4562 * success responses, clean up
4563 */
4564 l2cap_move_done(chan);
4565 }
4566
4567 /* Other amp move states imply that the move
4568 * has already aborted
4569 */
4570 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4571 break;
4572 }
4573}
4574
4575static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4576 struct hci_chan *hchan)
4577{
4578 struct l2cap_conf_rsp rsp;
1500109b 4579
336178a3 4580 chan->hs_hchan = hchan;
1500109b
MM		 4581 chan->hs_hcon->l2cap_data = chan->conn;
4582
35ba9561 4583 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4584
4585 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4586 int err;
1500109b
MM		 4587
4588 set_default_fcs(chan);
4589
4590 err = l2cap_ertm_init(chan);
4591 if (err < 0)
5e4e3972 4592 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4593 else
4594 l2cap_chan_ready(chan);
4595 }
4596}
4597
4598static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4599 struct hci_chan *hchan)
4600{
4601 chan->hs_hcon = hchan->conn;
4602 chan->hs_hcon->l2cap_data = chan->conn;
4603
4604 BT_DBG("move_state %d", chan->move_state);
4605
4606 switch (chan->move_state) {
4607 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4608 /* Move confirm will be sent after a success
4609 * response is received
4610 */
4611 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4612 break;
4613 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4614 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4615 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4616 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4617 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4618 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4619 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4620 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4621 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4622 }
4623 break;
4624 default:
4625 /* Move was not in expected state, free the channel */
4626 __release_logical_link(chan);
4627
4628 chan->move_state = L2CAP_MOVE_STABLE;
4629 }
4630}
4631
4632/* Call with chan locked */
27695fb4
AE		 4633void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4634 u8 status)
5b155ef9 4635{
1500109b
MM		 4636 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4637
4638 if (status) {
4639 l2cap_logical_fail(chan);
4640 __release_logical_link(chan);
4641 return;
4642 }
4643
4644 if (chan->state != BT_CONNECTED) {
4645 /* Ignore logical link if channel is on BR/EDR */
4646 if (chan->local_amp_id)
4647 l2cap_logical_finish_create(chan, hchan);
4648 } else {
4649 l2cap_logical_finish_move(chan, hchan);
4650 }
5b155ef9
MM		 4651}
4652
3f7a56c4
MM		 4653void l2cap_move_start(struct l2cap_chan *chan)
4654{
4655 BT_DBG("chan %p", chan);
4656
4657 if (chan->local_amp_id == HCI_BREDR_ID) {
4658 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4659 return;
4660 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4661 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4662 /* Placeholder - start physical link setup */
4663 } else {
4664 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4665 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4666 chan->move_id = 0;
4667 l2cap_move_setup(chan);
4668 l2cap_send_move_chan_req(chan, 0);
4669 }
4670}
4671
8eb200bd
MM		 4672static void l2cap_do_create(struct l2cap_chan *chan, int result,
4673 u8 local_amp_id, u8 remote_amp_id)
4674{
62748ca1
AE		 4675 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4676 local_amp_id, remote_amp_id);
4677
12d6cc60
AE		 4678 chan->fcs = L2CAP_FCS_NONE;
4679
62748ca1
AE		 4680 /* Outgoing channel on AMP */
4681 if (chan->state == BT_CONNECT) {
4682 if (result == L2CAP_CR_SUCCESS) {
4683 chan->local_amp_id = local_amp_id;
4684 l2cap_send_create_chan_req(chan, remote_amp_id);
4685 } else {
4686 /* Revert to BR/EDR connect */
4687 l2cap_send_conn_req(chan);
4688 }
4689
4690 return;
4691 }
4692
4693 /* Incoming channel on AMP */
4694 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4695 struct l2cap_conn_rsp rsp;
4696 char buf[128];
4697 rsp.scid = cpu_to_le16(chan->dcid);
4698 rsp.dcid = cpu_to_le16(chan->scid);
4699
8eb200bd
MM		 4700 if (result == L2CAP_CR_SUCCESS) {
4701 /* Send successful response */
62cd50e2
AE		 4702 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4703 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4704 } else {
4705 /* Send negative response */
62cd50e2
AE		 4706 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4707 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4708 }
4709
4710 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4711 sizeof(rsp), &rsp);
4712
4713 if (result == L2CAP_CR_SUCCESS) {
4714 __l2cap_state_change(chan, BT_CONFIG);
4715 set_bit(CONF_REQ_SENT, &chan->conf_state);
4716 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4717 L2CAP_CONF_REQ,
4718 l2cap_build_conf_req(chan, buf), buf);
4719 chan->num_conf_req++;
4720 }
8eb200bd
MM		 4721 }
4722}
4723
4724static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4725 u8 remote_amp_id)
4726{
4727 l2cap_move_setup(chan);
4728 chan->move_id = local_amp_id;
4729 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4730
4731 l2cap_send_move_chan_req(chan, remote_amp_id);
4732}
4733
4734static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4735{
4736 struct hci_chan *hchan = NULL;
4737
4738 /* Placeholder - get hci_chan for logical link */
4739
4740 if (hchan) {
4741 if (hchan->state == BT_CONNECTED) {
4742 /* Logical link is ready to go */
4743 chan->hs_hcon = hchan->conn;
4744 chan->hs_hcon->l2cap_data = chan->conn;
4745 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4746 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4747
4748 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4749 } else {
4750 /* Wait for logical link to be ready */
4751 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4752 }
4753 } else {
4754 /* Logical link not available */
4755 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4756 }
4757}
4758
4759static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4760{
4761 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4762 u8 rsp_result;
4763 if (result == -EINVAL)
4764 rsp_result = L2CAP_MR_BAD_ID;
4765 else
4766 rsp_result = L2CAP_MR_NOT_ALLOWED;
4767
4768 l2cap_send_move_chan_rsp(chan, rsp_result);
4769 }
4770
4771 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4772 chan->move_state = L2CAP_MOVE_STABLE;
4773
4774 /* Restart data transmission */
4775 l2cap_ertm_send(chan);
4776}
4777
a514b17f
AE		 4778/* Invoke with locked chan */
4779void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4780{
770bfefa 4781 u8 local_amp_id = chan->local_amp_id;
fffadc08 4782 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4783
8eb200bd
MM		 4784 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4785 chan, result, local_amp_id, remote_amp_id);
4786
8eb200bd
MM		 4787 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4788 l2cap_chan_unlock(chan);
4789 return;
4790 }
4791
4792 if (chan->state != BT_CONNECTED) {
4793 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4794 } else if (result != L2CAP_MR_SUCCESS) {
4795 l2cap_do_move_cancel(chan, result);
4796 } else {
4797 switch (chan->move_role) {
4798 case L2CAP_MOVE_ROLE_INITIATOR:
4799 l2cap_do_move_initiate(chan, local_amp_id,
4800 remote_amp_id);
4801 break;
4802 case L2CAP_MOVE_ROLE_RESPONDER:
4803 l2cap_do_move_respond(chan, result);
4804 break;
4805 default:
4806 l2cap_do_move_cancel(chan, result);
4807 break;
4808 }
4809 }
8eb200bd
MM		 4810}
4811
8d5a04a1 4812static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4813 struct l2cap_cmd_hdr *cmd,
4814 u16 cmd_len, void *data)
8d5a04a1
MM		 4815{
4816 struct l2cap_move_chan_req *req = data;
1500109b 4817 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4818 struct l2cap_chan *chan;
8d5a04a1
MM		 4819 u16 icid = 0;
4820 u16 result = L2CAP_MR_NOT_ALLOWED;
4821
4822 if (cmd_len != sizeof(*req))
4823 return -EPROTO;
4824
4825 icid = le16_to_cpu(req->icid);
4826
ad0ac6ca 4827 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1
MM		 4828
4829 if (!enable_hs)
4830 return -EINVAL;
4831
02b0fbb9
MM		 4832 chan = l2cap_get_chan_by_dcid(conn, icid);
4833 if (!chan) {
1500109b
MM		 4834 rsp.icid = cpu_to_le16(icid);
4835 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4836 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4837 sizeof(rsp), &rsp);
02b0fbb9
MM		 4838 return 0;
4839 }
4840
1500109b
MM		 4841 chan->ident = cmd->ident;
4842
02b0fbb9
MM		 4843 if (chan->scid < L2CAP_CID_DYN_START ||
4844 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4845 (chan->mode != L2CAP_MODE_ERTM &&
4846 chan->mode != L2CAP_MODE_STREAMING)) {
4847 result = L2CAP_MR_NOT_ALLOWED;
4848 goto send_move_response;
4849 }
4850
4851 if (chan->local_amp_id == req->dest_amp_id) {
4852 result = L2CAP_MR_SAME_ID;
4853 goto send_move_response;
4854 }
4855
4856 if (req->dest_amp_id) {
4857 struct hci_dev *hdev;
4858 hdev = hci_dev_get(req->dest_amp_id);
4859 if (!hdev || hdev->dev_type != HCI_AMP ||
4860 !test_bit(HCI_UP, &hdev->flags)) {
4861 if (hdev)
4862 hci_dev_put(hdev);
4863
4864 result = L2CAP_MR_BAD_ID;
4865 goto send_move_response;
4866 }
4867 hci_dev_put(hdev);
4868 }
4869
4870 /* Detect a move collision. Only send a collision response
4871 * if this side has "lost", otherwise proceed with the move.
4872 * The winner has the larger bd_addr.
4873 */
4874 if ((__chan_is_moving(chan) ||
4875 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4876 bacmp(conn->src, conn->dst) > 0) {
4877 result = L2CAP_MR_COLLISION;
4878 goto send_move_response;
4879 }
4880
02b0fbb9
MM		 4881 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4882 l2cap_move_setup(chan);
4883 chan->move_id = req->dest_amp_id;
4884 icid = chan->dcid;
4885
4886 if (!req->dest_amp_id) {
4887 /* Moving to BR/EDR */
4888 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4889 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4890 result = L2CAP_MR_PEND;
4891 } else {
4892 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4893 result = L2CAP_MR_SUCCESS;
4894 }
4895 } else {
4896 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4897 /* Placeholder - uncomment when amp functions are available */
4898 /*amp_accept_physical(chan, req->dest_amp_id);*/
4899 result = L2CAP_MR_PEND;
4900 }
4901
4902send_move_response:
1500109b 4903 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4904
02b0fbb9
MM		 4905 l2cap_chan_unlock(chan);
4906
8d5a04a1
MM		 4907 return 0;
4908}
4909
5b155ef9
MM		 4910static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4911{
4912 struct l2cap_chan *chan;
4913 struct hci_chan *hchan = NULL;
4914
4915 chan = l2cap_get_chan_by_scid(conn, icid);
4916 if (!chan) {
4917 l2cap_send_move_chan_cfm_icid(conn, icid);
4918 return;
4919 }
4920
4921 __clear_chan_timer(chan);
4922 if (result == L2CAP_MR_PEND)
4923 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4924
4925 switch (chan->move_state) {
4926 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4927 /* Move confirm will be sent when logical link
4928 * is complete.
4929 */
4930 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4931 break;
4932 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4933 if (result == L2CAP_MR_PEND) {
4934 break;
4935 } else if (test_bit(CONN_LOCAL_BUSY,
4936 &chan->conn_state)) {
4937 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4938 } else {
4939 /* Logical link is up or moving to BR/EDR,
4940 * proceed with move
4941 */
4942 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4943 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4944 }
4945 break;
4946 case L2CAP_MOVE_WAIT_RSP:
4947 /* Moving to AMP */
4948 if (result == L2CAP_MR_SUCCESS) {
4949 /* Remote is ready, send confirm immediately
4950 * after logical link is ready
4951 */
4952 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4953 } else {
4954 /* Both logical link and move success
4955 * are required to confirm
4956 */
4957 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4958 }
4959
4960 /* Placeholder - get hci_chan for logical link */
4961 if (!hchan) {
4962 /* Logical link not available */
4963 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4964 break;
4965 }
4966
4967 /* If the logical link is not yet connected, do not
4968 * send confirmation.
4969 */
4970 if (hchan->state != BT_CONNECTED)
4971 break;
4972
4973 /* Logical link is already ready to go */
4974
4975 chan->hs_hcon = hchan->conn;
4976 chan->hs_hcon->l2cap_data = chan->conn;
4977
4978 if (result == L2CAP_MR_SUCCESS) {
4979 /* Can confirm now */
4980 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4981 } else {
4982 /* Now only need move success
4983 * to confirm
4984 */
4985 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4986 }
4987
4988 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4989 break;
4990 default:
4991 /* Any other amp move state means the move failed. */
4992 chan->move_id = chan->local_amp_id;
4993 l2cap_move_done(chan);
4994 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4995 }
4996
4997 l2cap_chan_unlock(chan);
4998}
4999
5000static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5001 u16 result)
5002{
5003 struct l2cap_chan *chan;
5004
5005 chan = l2cap_get_chan_by_ident(conn, ident);
5006 if (!chan) {
5007 /* Could not locate channel, icid is best guess */
5008 l2cap_send_move_chan_cfm_icid(conn, icid);
5009 return;
5010 }
5011
5012 __clear_chan_timer(chan);
5013
5014 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5015 if (result == L2CAP_MR_COLLISION) {
5016 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5017 } else {
5018 /* Cleanup - cancel move */
5019 chan->move_id = chan->local_amp_id;
5020 l2cap_move_done(chan);
5021 }
5022 }
5023
5024 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5025
5026 l2cap_chan_unlock(chan);
5027}
5028
5029static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5030 struct l2cap_cmd_hdr *cmd,
5031 u16 cmd_len, void *data)
8d5a04a1
MM		 5032{
5033 struct l2cap_move_chan_rsp *rsp = data;
5034 u16 icid, result;
5035
5036 if (cmd_len != sizeof(*rsp))
5037 return -EPROTO;
5038
5039 icid = le16_to_cpu(rsp->icid);
5040 result = le16_to_cpu(rsp->result);
5041
ad0ac6ca 5042 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5043
5b155ef9
MM		 5044 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5045 l2cap_move_continue(conn, icid, result);
5046 else
5047 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5048
5049 return 0;
5050}
5051
5f3847a4
MM		 5052static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5053 struct l2cap_cmd_hdr *cmd,
5054 u16 cmd_len, void *data)
8d5a04a1
MM		 5055{
5056 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5057 struct l2cap_chan *chan;
8d5a04a1
MM		 5058 u16 icid, result;
5059
5060 if (cmd_len != sizeof(*cfm))
5061 return -EPROTO;
5062
5063 icid = le16_to_cpu(cfm->icid);
5064 result = le16_to_cpu(cfm->result);
5065
ad0ac6ca 5066 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5067
5f3847a4
MM		 5068 chan = l2cap_get_chan_by_dcid(conn, icid);
5069 if (!chan) {
5070 /* Spec requires a response even if the icid was not found */
5071 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5072 return 0;
5073 }
5074
5075 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5076 if (result == L2CAP_MC_CONFIRMED) {
5077 chan->local_amp_id = chan->move_id;
5078 if (!chan->local_amp_id)
5079 __release_logical_link(chan);
5080 } else {
5081 chan->move_id = chan->local_amp_id;
5082 }
5083
5084 l2cap_move_done(chan);
5085 }
5086
8d5a04a1
MM		 5087 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5088
5f3847a4
MM		 5089 l2cap_chan_unlock(chan);
5090
8d5a04a1
MM		 5091 return 0;
5092}
5093
5094static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5095 struct l2cap_cmd_hdr *cmd,
5096 u16 cmd_len, void *data)
8d5a04a1
MM		 5097{
5098 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5099 struct l2cap_chan *chan;
8d5a04a1
MM		 5100 u16 icid;
5101
5102 if (cmd_len != sizeof(*rsp))
5103 return -EPROTO;
5104
5105 icid = le16_to_cpu(rsp->icid);
5106
ad0ac6ca 5107 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5108
3fd71a0a
MM		 5109 chan = l2cap_get_chan_by_scid(conn, icid);
5110 if (!chan)
5111 return 0;
5112
5113 __clear_chan_timer(chan);
5114
5115 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5116 chan->local_amp_id = chan->move_id;
5117
5118 if (!chan->local_amp_id && chan->hs_hchan)
5119 __release_logical_link(chan);
5120
5121 l2cap_move_done(chan);
5122 }
5123
5124 l2cap_chan_unlock(chan);
5125
8d5a04a1
MM		 5126 return 0;
5127}
5128
e2174ca4 5129static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 5130 u16 to_multiplier)
de73115a
CT		 5131{
5132 u16 max_latency;
5133
5134 if (min > max || min < 6 || max > 3200)
5135 return -EINVAL;
5136
5137 if (to_multiplier < 10 || to_multiplier > 3200)
5138 return -EINVAL;
5139
5140 if (max >= to_multiplier * 8)
5141 return -EINVAL;
5142
5143 max_latency = (to_multiplier * 8 / max) - 1;
5144 if (latency > 499 || latency > max_latency)
5145 return -EINVAL;
5146
5147 return 0;
5148}
5149
5150static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818
GP		 5151 struct l2cap_cmd_hdr *cmd,
5152 u8 *data)
de73115a
CT		 5153{
5154 struct hci_conn *hcon = conn->hcon;
5155 struct l2cap_conn_param_update_req *req;
5156 struct l2cap_conn_param_update_rsp rsp;
5157 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 5158 int err;
de73115a
CT		 5159
5160 if (!(hcon->link_mode & HCI_LM_MASTER))
5161 return -EINVAL;
5162
5163 cmd_len = __le16_to_cpu(cmd->len);
5164 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5165 return -EPROTO;
5166
5167 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5168 min = __le16_to_cpu(req->min);
5169 max = __le16_to_cpu(req->max);
de73115a
CT		 5170 latency = __le16_to_cpu(req->latency);
5171 to_multiplier = __le16_to_cpu(req->to_multiplier);
5172
5173 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5174 min, max, latency, to_multiplier);
de73115a
CT		 5175
5176 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5177
5178 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5179 if (err)
ac73498c 5180 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5181 else
ac73498c 5182 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5183
5184 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5185 sizeof(rsp), &rsp);
de73115a 5186
2ce603eb
CT		 5187 if (!err)
5188 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5189
de73115a
CT		 5190 return 0;
5191}
5192
3300d9a9 5193static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5194 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5195 u8 *data)
3300d9a9
CT		 5196{
5197 int err = 0;
5198
5199 switch (cmd->code) {
5200 case L2CAP_COMMAND_REJ:
cb3b3152 5201 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5202 break;
5203
5204 case L2CAP_CONN_REQ:
cb3b3152 5205 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5206 break;
5207
5208 case L2CAP_CONN_RSP:
f5a2598d 5209 case L2CAP_CREATE_CHAN_RSP:
cb3b3152 5210 err = l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5211 break;
5212
5213 case L2CAP_CONF_REQ:
5214 err = l2cap_config_req(conn, cmd, cmd_len, data);
5215 break;
5216
5217 case L2CAP_CONF_RSP:
cb3b3152 5218 err = l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5219 break;
5220
5221 case L2CAP_DISCONN_REQ:
cb3b3152 5222 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5223 break;
5224
5225 case L2CAP_DISCONN_RSP:
cb3b3152 5226 err = l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5227 break;
5228
5229 case L2CAP_ECHO_REQ:
5230 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5231 break;
5232
5233 case L2CAP_ECHO_RSP:
5234 break;
5235
5236 case L2CAP_INFO_REQ:
cb3b3152 5237 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5238 break;
5239
5240 case L2CAP_INFO_RSP:
cb3b3152 5241 err = l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5242 break;
5243
f94ff6ff
MM		 5244 case L2CAP_CREATE_CHAN_REQ:
5245 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5246 break;
5247
8d5a04a1
MM		 5248 case L2CAP_MOVE_CHAN_REQ:
5249 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5250 break;
5251
5252 case L2CAP_MOVE_CHAN_RSP:
5253 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5254 break;
5255
5256 case L2CAP_MOVE_CHAN_CFM:
5257 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5258 break;
5259
5260 case L2CAP_MOVE_CHAN_CFM_RSP:
5261 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5262 break;
5263
3300d9a9
CT		 5264 default:
5265 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5266 err = -EINVAL;
5267 break;
5268 }
5269
5270 return err;
5271}
5272
5273static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2d792818 5274 struct l2cap_cmd_hdr *cmd, u8 *data)
3300d9a9
CT		 5275{
5276 switch (cmd->code) {
5277 case L2CAP_COMMAND_REJ:
5278 return 0;
5279
5280 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 5281 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 5282
5283 case L2CAP_CONN_PARAM_UPDATE_RSP:
5284 return 0;
5285
5286 default:
5287 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5288 return -EINVAL;
5289 }
5290}
5291
5292static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5293 struct sk_buff *skb)
1da177e4
LT		 5294{
5295 u8 *data = skb->data;
5296 int len = skb->len;
5297 struct l2cap_cmd_hdr cmd;
3300d9a9 5298 int err;
1da177e4
LT		 5299
5300 l2cap_raw_recv(conn, skb);
5301
5302 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5303 u16 cmd_len;
1da177e4
LT		 5304 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5305 data += L2CAP_CMD_HDR_SIZE;
5306 len -= L2CAP_CMD_HDR_SIZE;
5307
88219a0f 5308 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5309
2d792818
GP		 5310 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5311 cmd.ident);
1da177e4 5312
88219a0f 5313 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5314 BT_DBG("corrupted command");
5315 break;
5316 }
5317
3300d9a9
CT		 5318 if (conn->hcon->type == LE_LINK)
5319 err = l2cap_le_sig_cmd(conn, &cmd, data);
5320 else
5321 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 5322
5323 if (err) {
e2fd318e 5324 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5325
5326 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 5327
5328 /* FIXME: Map err to a valid reason */
ac73498c 5329 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5330 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5331 sizeof(rej), &rej);
1da177e4
LT		 5332 }
5333
88219a0f
AV		 5334 data += cmd_len;
5335 len -= cmd_len;
1da177e4
LT		 5336 }
5337
5338 kfree_skb(skb);
5339}
5340
47d1ec61 5341static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5342{
5343 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5344 int hdr_size;
5345
5346 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5347 hdr_size = L2CAP_EXT_HDR_SIZE;
5348 else
5349 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5350
47d1ec61 5351 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5352 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5353 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5354 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5355
5356 if (our_fcs != rcv_fcs)
7a560e5c 5357 return -EBADMSG;
fcc203c3
GP		 5358 }
5359 return 0;
5360}
5361
6ea00485 5362static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5363{
e31f7633 5364 struct l2cap_ctrl control;
d5392c8f 5365
e31f7633 5366 BT_DBG("chan %p", chan);
d5392c8f 5367
e31f7633
MM		 5368 memset(&control, 0, sizeof(control));
5369 control.sframe = 1;
5370 control.final = 1;
5371 control.reqseq = chan->buffer_seq;
5372 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5373
e2ab4353 5374 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5375 control.super = L2CAP_SUPER_RNR;
5376 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5377 }
5378
e31f7633
MM		 5379 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5380 chan->unacked_frames > 0)
5381 __set_retrans_timer(chan);
d5392c8f 5382
e31f7633 5383 /* Send pending iframes */
525cd185 5384 l2cap_ertm_send(chan);
d5392c8f 5385
e2ab4353 5386 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5387 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5388 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5389 * send it now.
5390 */
5391 control.super = L2CAP_SUPER_RR;
5392 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5393 }
5394}
5395
2d792818
GP		 5396static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5397 struct sk_buff **last_frag)
18778a63 5398{
84084a31
MM		 5399 /* skb->len reflects data in skb as well as all fragments
5400 * skb->data_len reflects only data in fragments
5401 */
5402 if (!skb_has_frag_list(skb))
5403 skb_shinfo(skb)->frag_list = new_frag;
5404
5405 new_frag->next = NULL;
5406
5407 (*last_frag)->next = new_frag;
5408 *last_frag = new_frag;
5409
5410 skb->len += new_frag->len;
5411 skb->data_len += new_frag->len;
5412 skb->truesize += new_frag->truesize;
5413}
5414
4b51dae9
MM		 5415static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5416 struct l2cap_ctrl *control)
84084a31
MM		 5417{
5418 int err = -EINVAL;
18778a63 5419
4b51dae9 5420 switch (control->sar) {
7e0ef6ee 5421 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5422 if (chan->sdu)
5423 break;
18778a63 5424
80b98027 5425 err = chan->ops->recv(chan, skb);
84084a31 5426 break;
18778a63 5427
7e0ef6ee 5428 case L2CAP_SAR_START:
84084a31
MM		 5429 if (chan->sdu)
5430 break;
18778a63 5431
6f61fd47 5432 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5433 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5434
84084a31
MM		 5435 if (chan->sdu_len > chan->imtu) {
5436 err = -EMSGSIZE;
5437 break;
5438 }
1890d36b 5439
84084a31
MM		 5440 if (skb->len >= chan->sdu_len)
5441 break;
18778a63 5442
84084a31
MM		 5443 chan->sdu = skb;
5444 chan->sdu_last_frag = skb;
18778a63 5445
84084a31
MM		 5446 skb = NULL;
5447 err = 0;
18778a63
GP		 5448 break;
5449
7e0ef6ee 5450 case L2CAP_SAR_CONTINUE:
6f61fd47 5451 if (!chan->sdu)
84084a31 5452 break;
18778a63 5453
84084a31
MM		 5454 append_skb_frag(chan->sdu, skb,
5455 &chan->sdu_last_frag);
5456 skb = NULL;
18778a63 5457
84084a31
MM		 5458 if (chan->sdu->len >= chan->sdu_len)
5459 break;
4178ba46 5460
84084a31 5461 err = 0;
18778a63
GP		 5462 break;
5463
7e0ef6ee 5464 case L2CAP_SAR_END:
6f61fd47 5465 if (!chan->sdu)
84084a31 5466 break;
18778a63 5467
84084a31
MM		 5468 append_skb_frag(chan->sdu, skb,
5469 &chan->sdu_last_frag);
5470 skb = NULL;
4178ba46 5471
84084a31
MM		 5472 if (chan->sdu->len != chan->sdu_len)
5473 break;
18778a63 5474
80b98027 5475 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5476
84084a31
MM		 5477 if (!err) {
5478 /* Reassembly complete */
5479 chan->sdu = NULL;
5480 chan->sdu_last_frag = NULL;
5481 chan->sdu_len = 0;
1890d36b 5482 }
18778a63
GP		 5483 break;
5484 }
5485
84084a31
MM		 5486 if (err) {
5487 kfree_skb(skb);
5488 kfree_skb(chan->sdu);
5489 chan->sdu = NULL;
5490 chan->sdu_last_frag = NULL;
5491 chan->sdu_len = 0;
5492 }
18778a63 5493
84084a31 5494 return err;
18778a63
GP		 5495}
5496
32b32735
MM		 5497static int l2cap_resegment(struct l2cap_chan *chan)
5498{
5499 /* Placeholder */
5500 return 0;
5501}
5502
61aa4f5b 5503void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5504{
61aa4f5b 5505 u8 event;
712132eb 5506
61aa4f5b
MM		 5507 if (chan->mode != L2CAP_MODE_ERTM)
5508 return;
712132eb 5509
61aa4f5b 5510 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5511 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5512}
5513
d2a7ac5d
MM		 5514static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5515{
63838725
MM		 5516 int err = 0;
5517 /* Pass sequential frames to l2cap_reassemble_sdu()
5518 * until a gap is encountered.
5519 */
5520
5521 BT_DBG("chan %p", chan);
5522
5523 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5524 struct sk_buff *skb;
5525 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5526 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5527
5528 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5529
5530 if (!skb)
5531 break;
5532
5533 skb_unlink(skb, &chan->srej_q);
5534 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5535 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5536 if (err)
5537 break;
5538 }
5539
5540 if (skb_queue_empty(&chan->srej_q)) {
5541 chan->rx_state = L2CAP_RX_STATE_RECV;
5542 l2cap_send_ack(chan);
5543 }
5544
5545 return err;
d2a7ac5d
MM		 5546}
5547
5548static void l2cap_handle_srej(struct l2cap_chan *chan,
5549 struct l2cap_ctrl *control)
5550{
f80842a8
MM		 5551 struct sk_buff *skb;
5552
5553 BT_DBG("chan %p, control %p", chan, control);
5554
5555 if (control->reqseq == chan->next_tx_seq) {
5556 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5557 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5558 return;
5559 }
5560
5561 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5562
5563 if (skb == NULL) {
5564 BT_DBG("Seq %d not available for retransmission",
5565 control->reqseq);
5566 return;
5567 }
5568
5569 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5570 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5571 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5572 return;
5573 }
5574
5575 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5576
5577 if (control->poll) {
5578 l2cap_pass_to_tx(chan, control);
5579
5580 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5581 l2cap_retransmit(chan, control);
5582 l2cap_ertm_send(chan);
5583
5584 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5585 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5586 chan->srej_save_reqseq = control->reqseq;
5587 }
5588 } else {
5589 l2cap_pass_to_tx_fbit(chan, control);
5590
5591 if (control->final) {
5592 if (chan->srej_save_reqseq != control->reqseq ||
5593 !test_and_clear_bit(CONN_SREJ_ACT,
5594 &chan->conn_state))
5595 l2cap_retransmit(chan, control);
5596 } else {
5597 l2cap_retransmit(chan, control);
5598 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5599 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5600 chan->srej_save_reqseq = control->reqseq;
5601 }
5602 }
5603 }
d2a7ac5d
MM		 5604}
5605
5606static void l2cap_handle_rej(struct l2cap_chan *chan,
5607 struct l2cap_ctrl *control)
5608{
fcd289df
MM		 5609 struct sk_buff *skb;
5610
5611 BT_DBG("chan %p, control %p", chan, control);
5612
5613 if (control->reqseq == chan->next_tx_seq) {
5614 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5615 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5616 return;
5617 }
5618
5619 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5620
5621 if (chan->max_tx && skb &&
5622 bt_cb(skb)->control.retries >= chan->max_tx) {
5623 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5624 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5625 return;
5626 }
5627
5628 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5629
5630 l2cap_pass_to_tx(chan, control);
5631
5632 if (control->final) {
5633 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5634 l2cap_retransmit_all(chan, control);
5635 } else {
5636 l2cap_retransmit_all(chan, control);
5637 l2cap_ertm_send(chan);
5638 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5639 set_bit(CONN_REJ_ACT, &chan->conn_state);
5640 }
d2a7ac5d
MM		 5641}
5642
4b51dae9
MM		 5643static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5644{
5645 BT_DBG("chan %p, txseq %d", chan, txseq);
5646
5647 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5648 chan->expected_tx_seq);
5649
5650 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5651 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5652 chan->tx_win) {
4b51dae9
MM		 5653 /* See notes below regarding "double poll" and
5654 * invalid packets.
5655 */
5656 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5657 BT_DBG("Invalid/Ignore - after SREJ");
5658 return L2CAP_TXSEQ_INVALID_IGNORE;
5659 } else {
5660 BT_DBG("Invalid - in window after SREJ sent");
5661 return L2CAP_TXSEQ_INVALID;
5662 }
5663 }
5664
5665 if (chan->srej_list.head == txseq) {
5666 BT_DBG("Expected SREJ");
5667 return L2CAP_TXSEQ_EXPECTED_SREJ;
5668 }
5669
5670 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5671 BT_DBG("Duplicate SREJ - txseq already stored");
5672 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5673 }
5674
5675 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5676 BT_DBG("Unexpected SREJ - not requested");
5677 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5678 }
5679 }
5680
5681 if (chan->expected_tx_seq == txseq) {
5682 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5683 chan->tx_win) {
5684 BT_DBG("Invalid - txseq outside tx window");
5685 return L2CAP_TXSEQ_INVALID;
5686 } else {
5687 BT_DBG("Expected");
5688 return L2CAP_TXSEQ_EXPECTED;
5689 }
5690 }
5691
5692 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 5693 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 5694 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5695 return L2CAP_TXSEQ_DUPLICATE;
5696 }
5697
5698 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5699 /* A source of invalid packets is a "double poll" condition,
5700 * where delays cause us to send multiple poll packets. If
5701 * the remote stack receives and processes both polls,
5702 * sequence numbers can wrap around in such a way that a
5703 * resent frame has a sequence number that looks like new data
5704 * with a sequence gap. This would trigger an erroneous SREJ
5705 * request.
5706 *
5707 * Fortunately, this is impossible with a tx window that's
5708 * less than half of the maximum sequence number, which allows
5709 * invalid frames to be safely ignored.
5710 *
5711 * With tx window sizes greater than half of the tx window
5712 * maximum, the frame is invalid and cannot be ignored. This
5713 * causes a disconnect.
5714 */
5715
5716 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5717 BT_DBG("Invalid/Ignore - txseq outside tx window");
5718 return L2CAP_TXSEQ_INVALID_IGNORE;
5719 } else {
5720 BT_DBG("Invalid - txseq outside tx window");
5721 return L2CAP_TXSEQ_INVALID;
5722 }
5723 } else {
5724 BT_DBG("Unexpected - txseq indicates missing frames");
5725 return L2CAP_TXSEQ_UNEXPECTED;
5726 }
5727}
5728
d2a7ac5d
MM		 5729static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5730 struct l2cap_ctrl *control,
5731 struct sk_buff *skb, u8 event)
5732{
5733 int err = 0;
5734 bool skb_in_use = 0;
5735
5736 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5737 event);
5738
5739 switch (event) {
5740 case L2CAP_EV_RECV_IFRAME:
5741 switch (l2cap_classify_txseq(chan, control->txseq)) {
5742 case L2CAP_TXSEQ_EXPECTED:
5743 l2cap_pass_to_tx(chan, control);
5744
5745 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5746 BT_DBG("Busy, discarding expected seq %d",
5747 control->txseq);
5748 break;
5749 }
5750
5751 chan->expected_tx_seq = __next_seq(chan,
5752 control->txseq);
5753
5754 chan->buffer_seq = chan->expected_tx_seq;
5755 skb_in_use = 1;
5756
5757 err = l2cap_reassemble_sdu(chan, skb, control);
5758 if (err)
5759 break;
5760
5761 if (control->final) {
5762 if (!test_and_clear_bit(CONN_REJ_ACT,
5763 &chan->conn_state)) {
5764 control->final = 0;
5765 l2cap_retransmit_all(chan, control);
5766 l2cap_ertm_send(chan);
5767 }
5768 }
5769
5770 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5771 l2cap_send_ack(chan);
5772 break;
5773 case L2CAP_TXSEQ_UNEXPECTED:
5774 l2cap_pass_to_tx(chan, control);
5775
5776 /* Can't issue SREJ frames in the local busy state.
5777 * Drop this frame, it will be seen as missing
5778 * when local busy is exited.
5779 */
5780 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5781 BT_DBG("Busy, discarding unexpected seq %d",
5782 control->txseq);
5783 break;
5784 }
5785
5786 /* There was a gap in the sequence, so an SREJ
5787 * must be sent for each missing frame. The
5788 * current frame is stored for later use.
5789 */
5790 skb_queue_tail(&chan->srej_q, skb);
5791 skb_in_use = 1;
5792 BT_DBG("Queued %p (queue len %d)", skb,
5793 skb_queue_len(&chan->srej_q));
5794
5795 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5796 l2cap_seq_list_clear(&chan->srej_list);
5797 l2cap_send_srej(chan, control->txseq);
5798
5799 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5800 break;
5801 case L2CAP_TXSEQ_DUPLICATE:
5802 l2cap_pass_to_tx(chan, control);
5803 break;
5804 case L2CAP_TXSEQ_INVALID_IGNORE:
5805 break;
5806 case L2CAP_TXSEQ_INVALID:
5807 default:
5e4e3972 5808 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5809 break;
5810 }
5811 break;
5812 case L2CAP_EV_RECV_RR:
5813 l2cap_pass_to_tx(chan, control);
5814 if (control->final) {
5815 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5816
e6a3ee6e
MM		 5817 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5818 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 5819 control->final = 0;
5820 l2cap_retransmit_all(chan, control);
5821 }
5822
5823 l2cap_ertm_send(chan);
5824 } else if (control->poll) {
5825 l2cap_send_i_or_rr_or_rnr(chan);
5826 } else {
5827 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5828 &chan->conn_state) &&
5829 chan->unacked_frames)
5830 __set_retrans_timer(chan);
5831
5832 l2cap_ertm_send(chan);
5833 }
5834 break;
5835 case L2CAP_EV_RECV_RNR:
5836 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5837 l2cap_pass_to_tx(chan, control);
5838 if (control && control->poll) {
5839 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5840 l2cap_send_rr_or_rnr(chan, 0);
5841 }
5842 __clear_retrans_timer(chan);
5843 l2cap_seq_list_clear(&chan->retrans_list);
5844 break;
5845 case L2CAP_EV_RECV_REJ:
5846 l2cap_handle_rej(chan, control);
5847 break;
5848 case L2CAP_EV_RECV_SREJ:
5849 l2cap_handle_srej(chan, control);
5850 break;
5851 default:
5852 break;
5853 }
5854
5855 if (skb && !skb_in_use) {
5856 BT_DBG("Freeing %p", skb);
5857 kfree_skb(skb);
5858 }
5859
5860 return err;
5861}
5862
5863static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5864 struct l2cap_ctrl *control,
5865 struct sk_buff *skb, u8 event)
5866{
5867 int err = 0;
5868 u16 txseq = control->txseq;
5869 bool skb_in_use = 0;
5870
5871 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5872 event);
5873
5874 switch (event) {
5875 case L2CAP_EV_RECV_IFRAME:
5876 switch (l2cap_classify_txseq(chan, txseq)) {
5877 case L2CAP_TXSEQ_EXPECTED:
5878 /* Keep frame for reassembly later */
5879 l2cap_pass_to_tx(chan, control);
5880 skb_queue_tail(&chan->srej_q, skb);
5881 skb_in_use = 1;
5882 BT_DBG("Queued %p (queue len %d)", skb,
5883 skb_queue_len(&chan->srej_q));
5884
5885 chan->expected_tx_seq = __next_seq(chan, txseq);
5886 break;
5887 case L2CAP_TXSEQ_EXPECTED_SREJ:
5888 l2cap_seq_list_pop(&chan->srej_list);
5889
5890 l2cap_pass_to_tx(chan, control);
5891 skb_queue_tail(&chan->srej_q, skb);
5892 skb_in_use = 1;
5893 BT_DBG("Queued %p (queue len %d)", skb,
5894 skb_queue_len(&chan->srej_q));
5895
5896 err = l2cap_rx_queued_iframes(chan);
5897 if (err)
5898 break;
5899
5900 break;
5901 case L2CAP_TXSEQ_UNEXPECTED:
5902 /* Got a frame that can't be reassembled yet.
5903 * Save it for later, and send SREJs to cover
5904 * the missing frames.
5905 */
5906 skb_queue_tail(&chan->srej_q, skb);
5907 skb_in_use = 1;
5908 BT_DBG("Queued %p (queue len %d)", skb,
5909 skb_queue_len(&chan->srej_q));
5910
5911 l2cap_pass_to_tx(chan, control);
5912 l2cap_send_srej(chan, control->txseq);
5913 break;
5914 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5915 /* This frame was requested with an SREJ, but
5916 * some expected retransmitted frames are
5917 * missing. Request retransmission of missing
5918 * SREJ'd frames.
5919 */
5920 skb_queue_tail(&chan->srej_q, skb);
5921 skb_in_use = 1;
5922 BT_DBG("Queued %p (queue len %d)", skb,
5923 skb_queue_len(&chan->srej_q));
5924
5925 l2cap_pass_to_tx(chan, control);
5926 l2cap_send_srej_list(chan, control->txseq);
5927 break;
5928 case L2CAP_TXSEQ_DUPLICATE_SREJ:
5929 /* We've already queued this frame. Drop this copy. */
5930 l2cap_pass_to_tx(chan, control);
5931 break;
5932 case L2CAP_TXSEQ_DUPLICATE:
5933 /* Expecting a later sequence number, so this frame
5934 * was already received. Ignore it completely.
5935 */
5936 break;
5937 case L2CAP_TXSEQ_INVALID_IGNORE:
5938 break;
5939 case L2CAP_TXSEQ_INVALID:
5940 default:
5e4e3972 5941 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5942 break;
5943 }
5944 break;
5945 case L2CAP_EV_RECV_RR:
5946 l2cap_pass_to_tx(chan, control);
5947 if (control->final) {
5948 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5949
5950 if (!test_and_clear_bit(CONN_REJ_ACT,
5951 &chan->conn_state)) {
5952 control->final = 0;
5953 l2cap_retransmit_all(chan, control);
5954 }
5955
5956 l2cap_ertm_send(chan);
5957 } else if (control->poll) {
5958 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5959 &chan->conn_state) &&
5960 chan->unacked_frames) {
5961 __set_retrans_timer(chan);
5962 }
5963
5964 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5965 l2cap_send_srej_tail(chan);
5966 } else {
5967 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5968 &chan->conn_state) &&
5969 chan->unacked_frames)
5970 __set_retrans_timer(chan);
5971
5972 l2cap_send_ack(chan);
5973 }
5974 break;
5975 case L2CAP_EV_RECV_RNR:
5976 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5977 l2cap_pass_to_tx(chan, control);
5978 if (control->poll) {
5979 l2cap_send_srej_tail(chan);
5980 } else {
5981 struct l2cap_ctrl rr_control;
5982 memset(&rr_control, 0, sizeof(rr_control));
5983 rr_control.sframe = 1;
5984 rr_control.super = L2CAP_SUPER_RR;
5985 rr_control.reqseq = chan->buffer_seq;
5986 l2cap_send_sframe(chan, &rr_control);
5987 }
5988
5989 break;
5990 case L2CAP_EV_RECV_REJ:
5991 l2cap_handle_rej(chan, control);
5992 break;
5993 case L2CAP_EV_RECV_SREJ:
5994 l2cap_handle_srej(chan, control);
5995 break;
5996 }
5997
5998 if (skb && !skb_in_use) {
5999 BT_DBG("Freeing %p", skb);
6000 kfree_skb(skb);
6001 }
6002
6003 return err;
6004}
6005
32b32735
MM		 6006static int l2cap_finish_move(struct l2cap_chan *chan)
6007{
6008 BT_DBG("chan %p", chan);
6009
6010 chan->rx_state = L2CAP_RX_STATE_RECV;
6011
6012 if (chan->hs_hcon)
6013 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6014 else
6015 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6016
6017 return l2cap_resegment(chan);
6018}
6019
6020static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6021 struct l2cap_ctrl *control,
6022 struct sk_buff *skb, u8 event)
6023{
6024 int err;
6025
6026 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6027 event);
6028
6029 if (!control->poll)
6030 return -EPROTO;
6031
6032 l2cap_process_reqseq(chan, control->reqseq);
6033
6034 if (!skb_queue_empty(&chan->tx_q))
6035 chan->tx_send_head = skb_peek(&chan->tx_q);
6036 else
6037 chan->tx_send_head = NULL;
6038
6039 /* Rewind next_tx_seq to the point expected
6040 * by the receiver.
6041 */
6042 chan->next_tx_seq = control->reqseq;
6043 chan->unacked_frames = 0;
6044
6045 err = l2cap_finish_move(chan);
6046 if (err)
6047 return err;
6048
6049 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6050 l2cap_send_i_or_rr_or_rnr(chan);
6051
6052 if (event == L2CAP_EV_RECV_IFRAME)
6053 return -EPROTO;
6054
6055 return l2cap_rx_state_recv(chan, control, NULL, event);
6056}
6057
6058static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6059 struct l2cap_ctrl *control,
6060 struct sk_buff *skb, u8 event)
6061{
6062 int err;
6063
6064 if (!control->final)
6065 return -EPROTO;
6066
6067 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6068
6069 chan->rx_state = L2CAP_RX_STATE_RECV;
6070 l2cap_process_reqseq(chan, control->reqseq);
6071
6072 if (!skb_queue_empty(&chan->tx_q))
6073 chan->tx_send_head = skb_peek(&chan->tx_q);
6074 else
6075 chan->tx_send_head = NULL;
6076
6077 /* Rewind next_tx_seq to the point expected
6078 * by the receiver.
6079 */
6080 chan->next_tx_seq = control->reqseq;
6081 chan->unacked_frames = 0;
6082
6083 if (chan->hs_hcon)
6084 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6085 else
6086 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6087
6088 err = l2cap_resegment(chan);
6089
6090 if (!err)
6091 err = l2cap_rx_state_recv(chan, control, skb, event);
6092
6093 return err;
6094}
6095
d2a7ac5d
MM		 6096static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6097{
6098 /* Make sure reqseq is for a packet that has been sent but not acked */
6099 u16 unacked;
6100
6101 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6102 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6103}
6104
cec8ab6e
MM		 6105static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6106 struct sk_buff *skb, u8 event)
218bb9df 6107{
d2a7ac5d
MM		 6108 int err = 0;
6109
6110 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6111 control, skb, event, chan->rx_state);
6112
6113 if (__valid_reqseq(chan, control->reqseq)) {
6114 switch (chan->rx_state) {
6115 case L2CAP_RX_STATE_RECV:
6116 err = l2cap_rx_state_recv(chan, control, skb, event);
6117 break;
6118 case L2CAP_RX_STATE_SREJ_SENT:
6119 err = l2cap_rx_state_srej_sent(chan, control, skb,
6120 event);
6121 break;
32b32735
MM		 6122 case L2CAP_RX_STATE_WAIT_P:
6123 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6124 break;
6125 case L2CAP_RX_STATE_WAIT_F:
6126 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6127 break;
d2a7ac5d
MM		 6128 default:
6129 /* shut it down */
6130 break;
6131 }
6132 } else {
6133 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6134 control->reqseq, chan->next_tx_seq,
6135 chan->expected_ack_seq);
5e4e3972 6136 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6137 }
6138
6139 return err;
cec8ab6e
MM		 6140}
6141
6142static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6143 struct sk_buff *skb)
6144{
4b51dae9
MM		 6145 int err = 0;
6146
6147 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6148 chan->rx_state);
6149
6150 if (l2cap_classify_txseq(chan, control->txseq) ==
6151 L2CAP_TXSEQ_EXPECTED) {
6152 l2cap_pass_to_tx(chan, control);
6153
6154 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6155 __next_seq(chan, chan->buffer_seq));
6156
6157 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6158
6159 l2cap_reassemble_sdu(chan, skb, control);
6160 } else {
6161 if (chan->sdu) {
6162 kfree_skb(chan->sdu);
6163 chan->sdu = NULL;
6164 }
6165 chan->sdu_last_frag = NULL;
6166 chan->sdu_len = 0;
6167
6168 if (skb) {
6169 BT_DBG("Freeing %p", skb);
6170 kfree_skb(skb);
6171 }
6172 }
6173
6174 chan->last_acked_seq = control->txseq;
6175 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6176
6177 return err;
cec8ab6e
MM		 6178}
6179
6180static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6181{
6182 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6183 u16 len;
6184 u8 event;
218bb9df 6185
b76bbd66
MM		 6186 __unpack_control(chan, skb);
6187
218bb9df
GP		 6188 len = skb->len;
6189
6190 /*
6191 * We can just drop the corrupted I-frame here.
6192 * Receiver will miss it and start proper recovery
cec8ab6e 6193 * procedures and ask for retransmission.
218bb9df 6194 */
47d1ec61 6195 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6196 goto drop;
6197
cec8ab6e 6198 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6199 len -= L2CAP_SDULEN_SIZE;
218bb9df 6200
47d1ec61 6201 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6202 len -= L2CAP_FCS_SIZE;
218bb9df 6203
47d1ec61 6204 if (len > chan->mps) {
5e4e3972 6205 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6206 goto drop;
6207 }
6208
cec8ab6e
MM		 6209 if (!control->sframe) {
6210 int err;
218bb9df 6211
cec8ab6e
MM		 6212 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6213 control->sar, control->reqseq, control->final,
6214 control->txseq);
218bb9df 6215
cec8ab6e
MM		 6216 /* Validate F-bit - F=0 always valid, F=1 only
6217 * valid in TX WAIT_F
6218 */
6219 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6220 goto drop;
cec8ab6e
MM		 6221
6222 if (chan->mode != L2CAP_MODE_STREAMING) {
6223 event = L2CAP_EV_RECV_IFRAME;
6224 err = l2cap_rx(chan, control, skb, event);
6225 } else {
6226 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6227 }
6228
cec8ab6e 6229 if (err)
5e4e3972 6230 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6231 } else {
cec8ab6e
MM		 6232 const u8 rx_func_to_event[4] = {
6233 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6234 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6235 };
6236
6237 /* Only I-frames are expected in streaming mode */
6238 if (chan->mode == L2CAP_MODE_STREAMING)
6239 goto drop;
6240
6241 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6242 control->reqseq, control->final, control->poll,
6243 control->super);
6244
218bb9df 6245 if (len != 0) {
1bb166e6 6246 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6247 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6248 goto drop;
6249 }
6250
cec8ab6e
MM		 6251 /* Validate F and P bits */
6252 if (control->final && (control->poll ||
6253 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6254 goto drop;
6255
6256 event = rx_func_to_event[control->super];
6257 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6258 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6259 }
6260
6261 return 0;
6262
6263drop:
6264 kfree_skb(skb);
6265 return 0;
6266}
6267
13ca56e0
AE		 6268static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6269 struct sk_buff *skb)
1da177e4 6270{
48454079 6271 struct l2cap_chan *chan;
1da177e4 6272
baa7e1fa 6273 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6274 if (!chan) {
97e8e89d
AE		 6275 if (cid == L2CAP_CID_A2MP) {
6276 chan = a2mp_channel_create(conn, skb);
6277 if (!chan) {
6278 kfree_skb(skb);
13ca56e0 6279 return;
97e8e89d
AE		 6280 }
6281
6282 l2cap_chan_lock(chan);
6283 } else {
6284 BT_DBG("unknown cid 0x%4.4x", cid);
6285 /* Drop packet and return */
6286 kfree_skb(skb);
13ca56e0 6287 return;
97e8e89d 6288 }
1da177e4
LT		 6289 }
6290
49208c9c 6291 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6292
89bc500e 6293 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6294 goto drop;
6295
0c1bc5c6 6296 switch (chan->mode) {
1c2acffb
GP		 6297 case L2CAP_MODE_BASIC:
6298 /* If socket recv buffers overflows we drop data here
6299 * which is *bad* because L2CAP has to be reliable.
6300 * But we don't have any other choice. L2CAP doesn't
6301 * provide flow control mechanism. */
1da177e4 6302
0c1bc5c6 6303 if (chan->imtu < skb->len)
1c2acffb 6304 goto drop;
1da177e4 6305
80b98027 6306 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6307 goto done;
6308 break;
6309
6310 case L2CAP_MODE_ERTM:
6840ed07 6311 case L2CAP_MODE_STREAMING:
cec8ab6e 6312 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6313 goto done;
6314
1c2acffb 6315 default:
0c1bc5c6 6316 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6317 break;
6318 }
1da177e4
LT		 6319
6320drop:
6321 kfree_skb(skb);
6322
6323done:
6be36555 6324 l2cap_chan_unlock(chan);
1da177e4
LT		 6325}
6326
84104b24
AE		 6327static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6328 struct sk_buff *skb)
1da177e4 6329{
23691d75 6330 struct l2cap_chan *chan;
1da177e4 6331
c2287681 6332 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 6333 if (!chan)
1da177e4
LT		 6334 goto drop;
6335
5b4cedaa 6336 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6337
89bc500e 6338 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6339 goto drop;
6340
e13e21dc 6341 if (chan->imtu < skb->len)
1da177e4
LT		 6342 goto drop;
6343
80b98027 6344 if (!chan->ops->recv(chan, skb))
84104b24 6345 return;
1da177e4
LT		 6346
6347drop:
6348 kfree_skb(skb);
1da177e4
LT		 6349}
6350
72f78356 6351static void l2cap_att_channel(struct l2cap_conn *conn,
6810fca7 6352 struct sk_buff *skb)
9f69bda6 6353{
23691d75 6354 struct l2cap_chan *chan;
9f69bda6 6355
72f78356
MH		 6356 chan = l2cap_global_chan_by_scid(0, L2CAP_CID_LE_DATA,
6357 conn->src, conn->dst);
23691d75 6358 if (!chan)
9f69bda6
GP		 6359 goto drop;
6360
5b4cedaa 6361 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6362
89bc500e 6363 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 6364 goto drop;
6365
e13e21dc 6366 if (chan->imtu < skb->len)
9f69bda6
GP		 6367 goto drop;
6368
80b98027 6369 if (!chan->ops->recv(chan, skb))
6810fca7 6370 return;
9f69bda6
GP		 6371
6372drop:
6373 kfree_skb(skb);
9f69bda6
GP		 6374}
6375
1da177e4
LT		 6376static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6377{
6378 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 6379 u16 cid, len;
6380 __le16 psm;
1da177e4
LT		 6381
6382 skb_pull(skb, L2CAP_HDR_SIZE);
6383 cid = __le16_to_cpu(lh->cid);
6384 len = __le16_to_cpu(lh->len);
6385
1c2acffb
GP		 6386 if (len != skb->len) {
6387 kfree_skb(skb);
6388 return;
6389 }
6390
1da177e4
LT		 6391 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6392
6393 switch (cid) {
3300d9a9 6394 case L2CAP_CID_LE_SIGNALING:
8db4dc46 6395 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6396 l2cap_sig_channel(conn, skb);
6397 break;
6398
8db4dc46 6399 case L2CAP_CID_CONN_LESS:
097db76c 6400 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6401 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6402 l2cap_conless_channel(conn, psm, skb);
6403 break;
6404
9f69bda6 6405 case L2CAP_CID_LE_DATA:
72f78356 6406 l2cap_att_channel(conn, skb);
9f69bda6
GP		 6407 break;
6408
b501d6a1
AB		 6409 case L2CAP_CID_SMP:
6410 if (smp_sig_channel(conn, skb))
6411 l2cap_conn_del(conn->hcon, EACCES);
6412 break;
6413
1da177e4
LT		 6414 default:
6415 l2cap_data_channel(conn, cid, skb);
6416 break;
6417 }
6418}
6419
6420/* ---- L2CAP interface with lower layer (HCI) ---- */
6421
686ebf28 6422int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 6423{
6424 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 6425 struct l2cap_chan *c;
1da177e4 6426
6ed93dc6 6427 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 6428
6429 /* Find listening sockets and check their link_mode */
23691d75
GP		 6430 read_lock(&chan_list_lock);
6431 list_for_each_entry(c, &chan_list, global_l) {
6432 struct sock *sk = c->sk;
4343478f 6433
89bc500e 6434 if (c->state != BT_LISTEN)
1da177e4
LT		 6435 continue;
6436
6437 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 6438 lm1 |= HCI_LM_ACCEPT;
43bd0f32 6439 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 6440 lm1 |= HCI_LM_MASTER;
1da177e4 6441 exact++;
2af6b9d5
MH		 6442 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
6443 lm2 |= HCI_LM_ACCEPT;
43bd0f32 6444 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 6445 lm2 |= HCI_LM_MASTER;
6446 }
1da177e4 6447 }
23691d75 6448 read_unlock(&chan_list_lock);
1da177e4
LT		 6449
6450 return exact ? lm1 : lm2;
6451}
6452
9e664631 6453void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 6454{
0139418c
MH		 6455 struct l2cap_conn *conn;
6456
6ed93dc6 6457 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 6458
1da177e4 6459 if (!status) {
baf43251 6460 conn = l2cap_conn_add(hcon);
1da177e4
LT		 6461 if (conn)
6462 l2cap_conn_ready(conn);
ba6fc317 6463 } else {
e175072f 6464 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 6465 }
1da177e4
LT		 6466}
6467
686ebf28 6468int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 6469{
6470 struct l2cap_conn *conn = hcon->l2cap_data;
6471
6472 BT_DBG("hcon %p", hcon);
6473
686ebf28 6474 if (!conn)
9f5a0d7b 6475 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 6476 return conn->disc_reason;
6477}
6478
9e664631 6479void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 6480{
6481 BT_DBG("hcon %p reason %d", hcon, reason);
6482
e175072f 6483 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 6484}
6485
4343478f 6486static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 6487{
715ec005 6488 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 6489 return;
6490
f62e4323 6491 if (encrypt == 0x00) {
4343478f 6492 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 6493 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 6494 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 6495 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 6496 } else {
4343478f 6497 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 6498 __clear_chan_timer(chan);
f62e4323
MH		 6499 }
6500}
6501
686ebf28 6502int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 6503{
0139418c 6504 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 6505 struct l2cap_chan *chan;
1da177e4 6506
0139418c 6507 if (!conn)
1da177e4 6508 return 0;
0139418c 6509
89d8b407 6510 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 6511
160dc6ac 6512 if (hcon->type == LE_LINK) {
35d4adcc
HG		 6513 if (!status && encrypt)
6514 smp_distribute_keys(conn, 0);
17cd3f37 6515 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 6516 }
6517
3df91ea2 6518 mutex_lock(&conn->chan_lock);
1da177e4 6519
3df91ea2 6520 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 6521 l2cap_chan_lock(chan);
1da177e4 6522
89d8b407
AE		 6523 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6524 state_to_string(chan->state));
f1cb9af5 6525
78eb2f98
AE		 6526 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6527 l2cap_chan_unlock(chan);
6528 continue;
6529 }
6530
f1cb9af5
VCG		 6531 if (chan->scid == L2CAP_CID_LE_DATA) {
6532 if (!status && encrypt) {
6533 chan->sec_level = hcon->sec_level;
cf4cd009 6534 l2cap_chan_ready(chan);
f1cb9af5
VCG		 6535 }
6536
6be36555 6537 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 6538 continue;
6539 }
6540
96eff46e 6541 if (!__l2cap_no_conn_pending(chan)) {
6be36555 6542 l2cap_chan_unlock(chan);
6a8d3010
MH		 6543 continue;
6544 }
6545
89bc500e 6546 if (!status && (chan->state == BT_CONNECTED ||
2d792818 6547 chan->state == BT_CONFIG)) {
a7d7723a
GP		 6548 struct sock *sk = chan->sk;
6549
c5daa683 6550 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
a7d7723a
GP		 6551 sk->sk_state_change(sk);
6552
4343478f 6553 l2cap_check_encryption(chan, encrypt);
6be36555 6554 l2cap_chan_unlock(chan);
9719f8af
MH		 6555 continue;
6556 }
6557
89bc500e 6558 if (chan->state == BT_CONNECT) {
b1235d79 6559 if (!status) {
93c3e8f5 6560 l2cap_start_connection(chan);
b1235d79 6561 } else {
ba13ccd9 6562 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 6563 }
89bc500e 6564 } else if (chan->state == BT_CONNECT2) {
6be36555 6565 struct sock *sk = chan->sk;
b1235d79 6566 struct l2cap_conn_rsp rsp;
df3c3931 6567 __u16 res, stat;
1da177e4 6568
6be36555
AE		 6569 lock_sock(sk);
6570
b1235d79 6571 if (!status) {
c5daa683
GP		 6572 if (test_bit(BT_SK_DEFER_SETUP,
6573 &bt_sk(sk)->flags)) {
df3c3931
JH		 6574 res = L2CAP_CR_PEND;
6575 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 6576 chan->ops->defer(chan);
df3c3931 6577 } else {
0e587be7 6578 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 6579 res = L2CAP_CR_SUCCESS;
6580 stat = L2CAP_CS_NO_INFO;
6581 }
b1235d79 6582 } else {
0e587be7 6583 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 6584 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 6585 res = L2CAP_CR_SEC_BLOCK;
6586 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 6587 }
6588
6be36555
AE		 6589 release_sock(sk);
6590
fe4128e0
GP		 6591 rsp.scid = cpu_to_le16(chan->dcid);
6592 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 6593 rsp.result = cpu_to_le16(res);
6594 rsp.status = cpu_to_le16(stat);
fc7f8a7e 6595 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 6596 sizeof(rsp), &rsp);
2d369359
MM		 6597
6598 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6599 res == L2CAP_CR_SUCCESS) {
6600 char buf[128];
6601 set_bit(CONF_REQ_SENT, &chan->conf_state);
6602 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6603 L2CAP_CONF_REQ,
6604 l2cap_build_conf_req(chan, buf),
6605 buf);
6606 chan->num_conf_req++;
6607 }
b1235d79 6608 }
1da177e4 6609
6be36555 6610 l2cap_chan_unlock(chan);
1da177e4
LT		 6611 }
6612
3df91ea2 6613 mutex_unlock(&conn->chan_lock);
b1235d79 6614
1da177e4
LT		 6615 return 0;
6616}
6617
686ebf28 6618int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 6619{
6620 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 6621 struct l2cap_hdr *hdr;
6622 int len;
1da177e4 6623
1d13a254
AE		 6624 /* For AMP controller do not create l2cap conn */
6625 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6626 goto drop;
1da177e4 6627
5a08ecce 6628 if (!conn)
baf43251 6629 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 6630
6631 if (!conn)
1da177e4
LT		 6632 goto drop;
6633
6634 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6635
d73a0988
AE		 6636 switch (flags) {
6637 case ACL_START:
6638 case ACL_START_NO_FLUSH:
6639 case ACL_COMPLETE:
1da177e4
LT		 6640 if (conn->rx_len) {
6641 BT_ERR("Unexpected start frame (len %d)", skb->len);
6642 kfree_skb(conn->rx_skb);
6643 conn->rx_skb = NULL;
6644 conn->rx_len = 0;
6645 l2cap_conn_unreliable(conn, ECOMM);
6646 }
6647
aae7fe22
AE		 6648 /* Start fragment always begin with Basic L2CAP header */
6649 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 6650 BT_ERR("Frame is too short (len %d)", skb->len);
6651 l2cap_conn_unreliable(conn, ECOMM);
6652 goto drop;
6653 }
6654
6655 hdr = (struct l2cap_hdr *) skb->data;
6656 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6657
6658 if (len == skb->len) {
6659 /* Complete frame received */
6660 l2cap_recv_frame(conn, skb);
6661 return 0;
6662 }
6663
6664 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6665
6666 if (skb->len > len) {
6667 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 6668 skb->len, len);
1da177e4
LT		 6669 l2cap_conn_unreliable(conn, ECOMM);
6670 goto drop;
6671 }
6672
6673 /* Allocate skb for the complete frame (with header) */
8bcde1f2 6674 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 6675 if (!conn->rx_skb)
1da177e4
LT		 6676 goto drop;
6677
d626f62b 6678 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6679 skb->len);
1da177e4 6680 conn->rx_len = len - skb->len;
d73a0988
AE		 6681 break;
6682
6683 case ACL_CONT:
1da177e4
LT		 6684 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6685
6686 if (!conn->rx_len) {
6687 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6688 l2cap_conn_unreliable(conn, ECOMM);
6689 goto drop;
6690 }
6691
6692 if (skb->len > conn->rx_len) {
6693 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 6694 skb->len, conn->rx_len);
1da177e4
LT		 6695 kfree_skb(conn->rx_skb);
6696 conn->rx_skb = NULL;
6697 conn->rx_len = 0;
6698 l2cap_conn_unreliable(conn, ECOMM);
6699 goto drop;
6700 }
6701
d626f62b 6702 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6703 skb->len);
1da177e4
LT		 6704 conn->rx_len -= skb->len;
6705
6706 if (!conn->rx_len) {
6707 /* Complete frame received */
6708 l2cap_recv_frame(conn, conn->rx_skb);
6709 conn->rx_skb = NULL;
6710 }
d73a0988 6711 break;
1da177e4
LT		 6712 }
6713
6714drop:
6715 kfree_skb(skb);
6716 return 0;
6717}
6718
aef7d97c 6719static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 6720{
23691d75 6721 struct l2cap_chan *c;
1da177e4 6722
333055f2 6723 read_lock(&chan_list_lock);
1da177e4 6724
23691d75
GP		 6725 list_for_each_entry(c, &chan_list, global_l) {
6726 struct sock *sk = c->sk;
101545f6 6727
fcb73338
AE		 6728 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
6729 &bt_sk(sk)->src, &bt_sk(sk)->dst,
6730 c->state, __le16_to_cpu(c->psm),
6731 c->scid, c->dcid, c->imtu, c->omtu,
6732 c->sec_level, c->mode);
61e1b4b7 6733 }
1da177e4 6734
333055f2 6735 read_unlock(&chan_list_lock);
1da177e4 6736
aef7d97c 6737 return 0;
1da177e4
LT		 6738}
6739
aef7d97c
MH		 6740static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6741{
6742 return single_open(file, l2cap_debugfs_show, inode->i_private);
6743}
6744
6745static const struct file_operations l2cap_debugfs_fops = {
6746 .open = l2cap_debugfs_open,
6747 .read = seq_read,
6748 .llseek = seq_lseek,
6749 .release = single_release,
6750};
6751
6752static struct dentry *l2cap_debugfs;
1da177e4 6753
64274518 6754int __init l2cap_init(void)
1da177e4
LT		 6755{
6756 int err;
be9d1227 6757
bb58f747 6758 err = l2cap_init_sockets();
1da177e4
LT		 6759 if (err < 0)
6760 return err;
6761
aef7d97c 6762 if (bt_debugfs) {
2d792818
GP		 6763 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6764 NULL, &l2cap_debugfs_fops);
aef7d97c
MH		 6765 if (!l2cap_debugfs)
6766 BT_ERR("Failed to create L2CAP debug file");
6767 }
1da177e4 6768
1da177e4 6769 return 0;
1da177e4
LT		 6770}
6771
64274518 6772void l2cap_exit(void)
1da177e4 6773{
aef7d97c 6774 debugfs_remove(l2cap_debugfs);
bb58f747 6775 l2cap_cleanup_sockets();
1da177e4
LT		 6776}
6777
d1c4a17d
GP		 6778module_param(disable_ertm, bool, 0644);
6779MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)