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Bluetooth: Fix missing L2CAP EWS Conf parameter
[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)
574 hci_conn_put(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
5d3de7df
VCG		 1449static void l2cap_conn_del(struct hci_conn *hcon, int err)
1450{
1451 struct l2cap_conn *conn = hcon->l2cap_data;
1452 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1453
1454 if (!conn)
1455 return;
1456
1457 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1458
1459 kfree_skb(conn->rx_skb);
1460
3df91ea2
AE		 1461 mutex_lock(&conn->chan_lock);
1462
5d3de7df
VCG		 1463 /* Kill channels */
1464 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1465 l2cap_chan_hold(chan);
6be36555
AE		 1466 l2cap_chan_lock(chan);
1467
5d3de7df 1468 l2cap_chan_del(chan, err);
6be36555
AE		 1469
1470 l2cap_chan_unlock(chan);
1471
80b98027 1472 chan->ops->close(chan);
61d6ef3e 1473 l2cap_chan_put(chan);
5d3de7df
VCG		 1474 }
1475
3df91ea2
AE		 1476 mutex_unlock(&conn->chan_lock);
1477
73d80deb
LAD		 1478 hci_chan_del(conn->hchan);
1479
5d3de7df 1480 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1481 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1482
51a8efd7 1483 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1484 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1485 smp_chan_destroy(conn);
d26a2345 1486 }
5d3de7df
VCG		 1487
1488 hcon->l2cap_data = NULL;
1489 kfree(conn);
1490}
1491
6c9d42a1 1492static void security_timeout(struct work_struct *work)
5d3de7df 1493{
6c9d42a1 1494 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1495 security_timer.work);
5d3de7df 1496
d06cc416
JH		 1497 BT_DBG("conn %p", conn);
1498
1499 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1500 smp_chan_destroy(conn);
1501 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1502 }
5d3de7df
VCG		 1503}
1504
1da177e4
LT		 1505static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1506{
0139418c 1507 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1508 struct hci_chan *hchan;
1da177e4 1509
0139418c 1510 if (conn || status)
1da177e4
LT		 1511 return conn;
1512
73d80deb
LAD		 1513 hchan = hci_chan_create(hcon);
1514 if (!hchan)
1515 return NULL;
1516
8bcde1f2 1517 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
73d80deb
LAD		 1518 if (!conn) {
1519 hci_chan_del(hchan);
1da177e4 1520 return NULL;
73d80deb 1521 }
1da177e4
LT		 1522
1523 hcon->l2cap_data = conn;
1524 conn->hcon = hcon;
73d80deb 1525 conn->hchan = hchan;
1da177e4 1526
73d80deb 1527 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1528
dcc042d5
AE		 1529 switch (hcon->type) {
1530 case AMP_LINK:
1531 conn->mtu = hcon->hdev->block_mtu;
1532 break;
1533
1534 case LE_LINK:
1535 if (hcon->hdev->le_mtu) {
1536 conn->mtu = hcon->hdev->le_mtu;
1537 break;
1538 }
1539 /* fall through */
1540
1541 default:
acd7d370 1542 conn->mtu = hcon->hdev->acl_mtu;
dcc042d5
AE		 1543 break;
1544 }
acd7d370 1545
1da177e4
LT		 1546 conn->src = &hcon->hdev->bdaddr;
1547 conn->dst = &hcon->dst;
1548
4e8402a3
MH		 1549 conn->feat_mask = 0;
1550
1da177e4 1551 spin_lock_init(&conn->lock);
3df91ea2 1552 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1553
1554 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1555
5d3de7df 1556 if (hcon->type == LE_LINK)
6c9d42a1 1557 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1558 else
030013d8 1559 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1560
9f5a0d7b 1561 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1562
1da177e4
LT		 1563 return conn;
1564}
1565
1da177e4 1566/* ---- Socket interface ---- */
1da177e4 1567
c2287681 1568/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1569 * Returns closest match.
1570 */
c2287681
IY		 1571static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1572 bdaddr_t *src,
1573 bdaddr_t *dst)
1da177e4 1574{
23691d75 1575 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1576
23691d75 1577 read_lock(&chan_list_lock);
e0f0cb56 1578
23691d75
GP		 1579 list_for_each_entry(c, &chan_list, global_l) {
1580 struct sock *sk = c->sk;
fe4128e0 1581
89bc500e 1582 if (state && c->state != state)
1da177e4
LT		 1583 continue;
1584
23691d75 1585 if (c->psm == psm) {
c2287681
IY		 1586 int src_match, dst_match;
1587 int src_any, dst_any;
1588
1da177e4 1589 /* Exact match. */
c2287681
IY		 1590 src_match = !bacmp(&bt_sk(sk)->src, src);
1591 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1592 if (src_match && dst_match) {
a7567b20 1593 read_unlock(&chan_list_lock);
23691d75
GP		 1594 return c;
1595 }
1da177e4
LT		 1596
1597 /* Closest match */
c2287681
IY		 1598 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1599 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1600 if ((src_match && dst_any) || (src_any && dst_match) ||
1601 (src_any && dst_any))
23691d75 1602 c1 = c;
1da177e4
LT		 1603 }
1604 }
1da177e4 1605
23691d75 1606 read_unlock(&chan_list_lock);
e0f0cb56 1607
23691d75 1608 return c1;
1da177e4
LT		 1609}
1610
8e9f9892
AG		 1611int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1612 bdaddr_t *dst, u8 dst_type)
1da177e4 1613{
5d41ce1d 1614 struct sock *sk = chan->sk;
1da177e4 1615 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1616 struct l2cap_conn *conn;
1617 struct hci_conn *hcon;
1618 struct hci_dev *hdev;
09ab6f4c 1619 __u8 auth_type;
44d0e48e 1620 int err;
1da177e4 1621
6ed93dc6 1622 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst,
ab19516a 1623 dst_type, __le16_to_cpu(psm));
1da177e4 1624
af05b30b
GP		 1625 hdev = hci_get_route(dst, src);
1626 if (!hdev)
1da177e4
LT		 1627 return -EHOSTUNREACH;
1628
09fd0de5 1629 hci_dev_lock(hdev);
1da177e4 1630
6be36555 1631 l2cap_chan_lock(chan);
03a00194
GP		 1632
1633 /* PSM must be odd and lsb of upper byte must be 0 */
1634 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
2d792818 1635 chan->chan_type != L2CAP_CHAN_RAW) {
03a00194
GP		 1636 err = -EINVAL;
1637 goto done;
1638 }
1639
1640 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1641 err = -EINVAL;
1642 goto done;
1643 }
1644
1645 switch (chan->mode) {
1646 case L2CAP_MODE_BASIC:
1647 break;
1648 case L2CAP_MODE_ERTM:
1649 case L2CAP_MODE_STREAMING:
1650 if (!disable_ertm)
1651 break;
1652 /* fall through */
1653 default:
1654 err = -ENOTSUPP;
1655 goto done;
1656 }
1657
0797e01d 1658 switch (chan->state) {
03a00194
GP		 1659 case BT_CONNECT:
1660 case BT_CONNECT2:
1661 case BT_CONFIG:
1662 /* Already connecting */
1663 err = 0;
1664 goto done;
1665
1666 case BT_CONNECTED:
1667 /* Already connected */
1668 err = -EISCONN;
1669 goto done;
1670
1671 case BT_OPEN:
1672 case BT_BOUND:
1673 /* Can connect */
1674 break;
1675
1676 default:
1677 err = -EBADFD;
1678 goto done;
1679 }
1680
1681 /* Set destination address and psm */
0797e01d 1682 lock_sock(sk);
9219b2a0 1683 bacpy(&bt_sk(sk)->dst, dst);
6be36555
AE		 1684 release_sock(sk);
1685
03a00194
GP		 1686 chan->psm = psm;
1687 chan->dcid = cid;
1da177e4 1688
4343478f 1689 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1690
fe4128e0 1691 if (chan->dcid == L2CAP_CID_LE_DATA)
8e9f9892 1692 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1693 chan->sec_level, auth_type);
acd7d370 1694 else
8e9f9892 1695 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1696 chan->sec_level, auth_type);
acd7d370 1697
30e76272
VT		 1698 if (IS_ERR(hcon)) {
1699 err = PTR_ERR(hcon);
1da177e4 1700 goto done;
30e76272 1701 }
1da177e4
LT		 1702
1703 conn = l2cap_conn_add(hcon, 0);
1704 if (!conn) {
1705 hci_conn_put(hcon);
30e76272 1706 err = -ENOMEM;
1da177e4
LT		 1707 goto done;
1708 }
1709
9f0caeb1
VCG		 1710 if (hcon->type == LE_LINK) {
1711 err = 0;
1712
1713 if (!list_empty(&conn->chan_l)) {
1714 err = -EBUSY;
1715 hci_conn_put(hcon);
1716 }
1717
1718 if (err)
1719 goto done;
1720 }
1721
1da177e4
LT		 1722 /* Update source addr of the socket */
1723 bacpy(src, conn->src);
1724
6be36555 1725 l2cap_chan_unlock(chan);
48454079 1726 l2cap_chan_add(conn, chan);
6be36555 1727 l2cap_chan_lock(chan);
48454079 1728
6be36555 1729 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1730 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1731
1732 if (hcon->state == BT_CONNECTED) {
715ec005 1733 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1734 __clear_chan_timer(chan);
d45fc423 1735 if (l2cap_chan_check_security(chan))
6be36555 1736 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1737 } else
fc7f8a7e 1738 l2cap_do_start(chan);
1da177e4
LT		 1739 }
1740
30e76272
VT		 1741 err = 0;
1742
1da177e4 1743done:
6be36555 1744 l2cap_chan_unlock(chan);
09fd0de5 1745 hci_dev_unlock(hdev);
1da177e4
LT		 1746 hci_dev_put(hdev);
1747 return err;
1748}
1749
dcba0dba 1750int __l2cap_wait_ack(struct sock *sk)
6161c038 1751{
8c1d787b 1752 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1753 DECLARE_WAITQUEUE(wait, current);
1754 int err = 0;
1755 int timeo = HZ/5;
1756
2b0b05dd 1757 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1758 set_current_state(TASK_INTERRUPTIBLE);
1759 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1760 if (!timeo)
1761 timeo = HZ/5;
1762
1763 if (signal_pending(current)) {
1764 err = sock_intr_errno(timeo);
1765 break;
1766 }
1767
1768 release_sock(sk);
1769 timeo = schedule_timeout(timeo);
1770 lock_sock(sk);
a71a0cf4 1771 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1772
1773 err = sock_error(sk);
1774 if (err)
1775 break;
1776 }
1777 set_current_state(TASK_RUNNING);
2b0b05dd 1778 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1779 return err;
1780}
1781
721c4181 1782static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1783{
721c4181 1784 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1785 monitor_timer.work);
e90bac06 1786
525cd185 1787 BT_DBG("chan %p", chan);
0e98958d 1788
6be36555
AE		 1789 l2cap_chan_lock(chan);
1790
80909e04 1791 if (!chan->conn) {
6be36555 1792 l2cap_chan_unlock(chan);
8d7e1c7f 1793 l2cap_chan_put(chan);
e90bac06
GP		 1794 return;
1795 }
1796
401bb1f7 1797 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1798
6be36555 1799 l2cap_chan_unlock(chan);
8d7e1c7f 1800 l2cap_chan_put(chan);
e90bac06
GP		 1801}
1802
721c4181 1803static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1804{
721c4181 1805 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1806 retrans_timer.work);
e90bac06 1807
49208c9c 1808 BT_DBG("chan %p", chan);
0e98958d 1809
6be36555
AE		 1810 l2cap_chan_lock(chan);
1811
80909e04
MM		 1812 if (!chan->conn) {
1813 l2cap_chan_unlock(chan);
1814 l2cap_chan_put(chan);
1815 return;
1816 }
6be36555 1817
401bb1f7 1818 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1819 l2cap_chan_unlock(chan);
8d7e1c7f 1820 l2cap_chan_put(chan);
e90bac06
GP		 1821}
1822
d660366d
GP		 1823static void l2cap_streaming_send(struct l2cap_chan *chan,
1824 struct sk_buff_head *skbs)
6840ed07 1825{
ccbb84af 1826 struct sk_buff *skb;
3733937d 1827 struct l2cap_ctrl *control;
6840ed07 1828
3733937d
MM		 1829 BT_DBG("chan %p, skbs %p", chan, skbs);
1830
b99e13ad
MM		 1831 if (__chan_is_moving(chan))
1832 return;
1833
3733937d
MM		 1834 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1835
1836 while (!skb_queue_empty(&chan->tx_q)) {
1837
1838 skb = skb_dequeue(&chan->tx_q);
1839
1840 bt_cb(skb)->control.retries = 1;
1841 control = &bt_cb(skb)->control;
1842
1843 control->reqseq = 0;
1844 control->txseq = chan->next_tx_seq;
1845
1846 __pack_control(chan, control, skb);
6840ed07 1847
47d1ec61 1848 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1849 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1850 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1851 }
1852
4343478f 1853 l2cap_do_send(chan, skb);
6840ed07 1854
b4400672 1855 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1856
836be934 1857 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1858 chan->frames_sent++;
6840ed07 1859 }
6840ed07
GP		 1860}
1861
67c9e840 1862static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1863{
1864 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1865 struct l2cap_ctrl *control;
1866 int sent = 0;
1867
1868 BT_DBG("chan %p", chan);
1c2acffb 1869
89bc500e 1870 if (chan->state != BT_CONNECTED)
c13ffa62 1871 return -ENOTCONN;
e90bac06 1872
94122bbe
MM		 1873 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1874 return 0;
1875
b99e13ad
MM		 1876 if (__chan_is_moving(chan))
1877 return 0;
1878
18a48e76
MM		 1879 while (chan->tx_send_head &&
1880 chan->unacked_frames < chan->remote_tx_win &&
1881 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1882
18a48e76 1883 skb = chan->tx_send_head;
e90bac06 1884
18a48e76
MM		 1885 bt_cb(skb)->control.retries = 1;
1886 control = &bt_cb(skb)->control;
95ffa978 1887
e2ab4353 1888 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1889 control->final = 1;
e2ab4353 1890
18a48e76
MM		 1891 control->reqseq = chan->buffer_seq;
1892 chan->last_acked_seq = chan->buffer_seq;
1893 control->txseq = chan->next_tx_seq;
1c2acffb 1894
18a48e76 1895 __pack_control(chan, control, skb);
e90bac06 1896
47d1ec61 1897 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1898 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1899 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1900 }
1901
18a48e76
MM		 1902 /* Clone after data has been modified. Data is assumed to be
1903 read-only (for locking purposes) on cloned sk_buffs.
1904 */
1905 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1906
18a48e76
MM		 1907 if (!tx_skb)
1908 break;
1c2acffb 1909
18a48e76 1910 __set_retrans_timer(chan);
836be934
AE		 1911
1912 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1913 chan->unacked_frames++;
6a026610 1914 chan->frames_sent++;
18a48e76 1915 sent++;
1c2acffb 1916
58d35f87
GP		 1917 if (skb_queue_is_last(&chan->tx_q, skb))
1918 chan->tx_send_head = NULL;
1c2acffb 1919 else
58d35f87 1920 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1921
1922 l2cap_do_send(chan, tx_skb);
b4400672 1923 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1924 }
1925
b4400672
AE		 1926 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1927 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1928
1929 return sent;
9e917af1
GP		 1930}
1931
e1fbd4c1
MM		 1932static void l2cap_ertm_resend(struct l2cap_chan *chan)
1933{
1934 struct l2cap_ctrl control;
1935 struct sk_buff *skb;
1936 struct sk_buff *tx_skb;
1937 u16 seq;
1938
1939 BT_DBG("chan %p", chan);
1940
1941 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1942 return;
1943
b99e13ad
MM		 1944 if (__chan_is_moving(chan))
1945 return;
1946
e1fbd4c1
MM		 1947 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1948 seq = l2cap_seq_list_pop(&chan->retrans_list);
1949
1950 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1951 if (!skb) {
1952 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1953 seq);
e1fbd4c1
MM		 1954 continue;
1955 }
1956
1957 bt_cb(skb)->control.retries++;
1958 control = bt_cb(skb)->control;
1959
1960 if (chan->max_tx != 0 &&
1961 bt_cb(skb)->control.retries > chan->max_tx) {
1962 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1963 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1964 l2cap_seq_list_clear(&chan->retrans_list);
1965 break;
1966 }
1967
1968 control.reqseq = chan->buffer_seq;
1969 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1970 control.final = 1;
1971 else
1972 control.final = 0;
1973
1974 if (skb_cloned(skb)) {
1975 /* Cloned sk_buffs are read-only, so we need a
1976 * writeable copy
1977 */
8bcde1f2 1978 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1979 } else {
8bcde1f2 1980 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1981 }
1982
1983 if (!tx_skb) {
1984 l2cap_seq_list_clear(&chan->retrans_list);
1985 break;
1986 }
1987
1988 /* Update skb contents */
1989 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1990 put_unaligned_le32(__pack_extended_control(&control),
1991 tx_skb->data + L2CAP_HDR_SIZE);
1992 } else {
1993 put_unaligned_le16(__pack_enhanced_control(&control),
1994 tx_skb->data + L2CAP_HDR_SIZE);
1995 }
1996
1997 if (chan->fcs == L2CAP_FCS_CRC16) {
1998 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
1999 put_unaligned_le16(fcs, skb_put(tx_skb,
2000 L2CAP_FCS_SIZE));
2001 }
2002
2003 l2cap_do_send(chan, tx_skb);
2004
2005 BT_DBG("Resent txseq %d", control.txseq);
2006
2007 chan->last_acked_seq = chan->buffer_seq;
2008 }
2009}
2010
f80842a8
MM		 2011static void l2cap_retransmit(struct l2cap_chan *chan,
2012 struct l2cap_ctrl *control)
2013{
2014 BT_DBG("chan %p, control %p", chan, control);
2015
2016 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2017 l2cap_ertm_resend(chan);
2018}
2019
d2a7ac5d
MM		 2020static void l2cap_retransmit_all(struct l2cap_chan *chan,
2021 struct l2cap_ctrl *control)
2022{
e1fbd4c1
MM		 2023 struct sk_buff *skb;
2024
2025 BT_DBG("chan %p, control %p", chan, control);
2026
2027 if (control->poll)
2028 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2029
2030 l2cap_seq_list_clear(&chan->retrans_list);
2031
2032 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2033 return;
2034
2035 if (chan->unacked_frames) {
2036 skb_queue_walk(&chan->tx_q, skb) {
2037 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2038 skb == chan->tx_send_head)
e1fbd4c1
MM		 2039 break;
2040 }
2041
2042 skb_queue_walk_from(&chan->tx_q, skb) {
2043 if (skb == chan->tx_send_head)
2044 break;
2045
2046 l2cap_seq_list_append(&chan->retrans_list,
2047 bt_cb(skb)->control.txseq);
2048 }
2049
2050 l2cap_ertm_resend(chan);
2051 }
d2a7ac5d
MM		 2052}
2053
0a0aba42 2054static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2055{
0a0aba42
MM		 2056 struct l2cap_ctrl control;
2057 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2058 chan->last_acked_seq);
2059 int threshold;
9e917af1 2060
0a0aba42
MM		 2061 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2062 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2063
0a0aba42
MM		 2064 memset(&control, 0, sizeof(control));
2065 control.sframe = 1;
dfc909be 2066
0a0aba42
MM		 2067 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2068 chan->rx_state == L2CAP_RX_STATE_RECV) {
2069 __clear_ack_timer(chan);
2070 control.super = L2CAP_SUPER_RNR;
2071 control.reqseq = chan->buffer_seq;
2072 l2cap_send_sframe(chan, &control);
2073 } else {
2074 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2075 l2cap_ertm_send(chan);
2076 /* If any i-frames were sent, they included an ack */
2077 if (chan->buffer_seq == chan->last_acked_seq)
2078 frames_to_ack = 0;
2079 }
dfc909be 2080
c20f8e35 2081 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2082 * Calculate without mul or div
2083 */
c20f8e35 2084 threshold = chan->ack_win;
0a0aba42
MM		 2085 threshold += threshold << 1;
2086 threshold >>= 2;
2087
b4400672 2088 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2089 threshold);
2090
2091 if (frames_to_ack >= threshold) {
2092 __clear_ack_timer(chan);
2093 control.super = L2CAP_SUPER_RR;
2094 control.reqseq = chan->buffer_seq;
2095 l2cap_send_sframe(chan, &control);
2096 frames_to_ack = 0;
2097 }
1c2acffb 2098
0a0aba42
MM		 2099 if (frames_to_ack)
2100 __set_ack_timer(chan);
2101 }
b17e73bb
SJ		 2102}
2103
04124681
GP		 2104static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2105 struct msghdr *msg, int len,
2106 int count, struct sk_buff *skb)
1c2acffb 2107{
0952a57a 2108 struct l2cap_conn *conn = chan->conn;
1c2acffb 2109 struct sk_buff **frag;
90338947 2110 int sent = 0;
1da177e4 2111
59203a21 2112 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2113 return -EFAULT;
1da177e4
LT		 2114
2115 sent += count;
2116 len -= count;
2117
2118 /* Continuation fragments (no L2CAP header) */
2119 frag = &skb_shinfo(skb)->frag_list;
2120 while (len) {
fbe00700
GP		 2121 struct sk_buff *tmp;
2122
1da177e4
LT		 2123 count = min_t(unsigned int, conn->mtu, len);
2124
fbe00700
GP		 2125 tmp = chan->ops->alloc_skb(chan, count,
2126 msg->msg_flags & MSG_DONTWAIT);
2127 if (IS_ERR(tmp))
2128 return PTR_ERR(tmp);
2129
2130 *frag = tmp;
2f7719ce 2131
1c2acffb
GP		 2132 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2133 return -EFAULT;
1da177e4 2134
5e59b791
LAD		 2135 (*frag)->priority = skb->priority;
2136
1da177e4
LT		 2137 sent += count;
2138 len -= count;
2139
2d0ed3d5
GP		 2140 skb->len += (*frag)->len;
2141 skb->data_len += (*frag)->len;
2142
1da177e4
LT		 2143 frag = &(*frag)->next;
2144 }
1da177e4
LT		 2145
2146 return sent;
1c2acffb 2147}
1da177e4 2148
5e59b791 2149static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2150 struct msghdr *msg, size_t len,
2151 u32 priority)
1c2acffb 2152{
8c1d787b 2153 struct l2cap_conn *conn = chan->conn;
1c2acffb 2154 struct sk_buff *skb;
03a51213 2155 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2156 struct l2cap_hdr *lh;
2157
b4400672 2158 BT_DBG("chan %p len %zu priority %u", chan, len, priority);
1c2acffb
GP		 2159
2160 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2161
2162 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2163 msg->msg_flags & MSG_DONTWAIT);
2164 if (IS_ERR(skb))
2165 return skb;
1c2acffb 2166
5e59b791
LAD		 2167 skb->priority = priority;
2168
1c2acffb
GP		 2169 /* Create L2CAP header */
2170 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2171 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c
AE		 2172 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2173 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2174
0952a57a 2175 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2176 if (unlikely(err < 0)) {
2177 kfree_skb(skb);
2178 return ERR_PTR(err);
2179 }
2180 return skb;
2181}
2182
5e59b791 2183static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2184 struct msghdr *msg, size_t len,
2185 u32 priority)
1c2acffb 2186{
8c1d787b 2187 struct l2cap_conn *conn = chan->conn;
1c2acffb 2188 struct sk_buff *skb;
f2ba7fae 2189 int err, count;
1c2acffb
GP		 2190 struct l2cap_hdr *lh;
2191
b4400672 2192 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2193
f2ba7fae 2194 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2195
f2ba7fae 2196 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2197 msg->msg_flags & MSG_DONTWAIT);
2198 if (IS_ERR(skb))
2199 return skb;
1c2acffb 2200
5e59b791
LAD		 2201 skb->priority = priority;
2202
1c2acffb
GP		 2203 /* Create L2CAP header */
2204 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2205 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2206 lh->len = cpu_to_le16(len);
1c2acffb 2207
0952a57a 2208 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2209 if (unlikely(err < 0)) {
2210 kfree_skb(skb);
2211 return ERR_PTR(err);
2212 }
2213 return skb;
2214}
2215
ab0ff76d 2216static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2217 struct msghdr *msg, size_t len,
2218 u16 sdulen)
1c2acffb 2219{
8c1d787b 2220 struct l2cap_conn *conn = chan->conn;
1c2acffb 2221 struct sk_buff *skb;
e4ca6d98 2222 int err, count, hlen;
1c2acffb
GP		 2223 struct l2cap_hdr *lh;
2224
b4400672 2225 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2226
0ee0d208
GP		 2227 if (!conn)
2228 return ERR_PTR(-ENOTCONN);
2229
ba7aa64f 2230 hlen = __ertm_hdr_size(chan);
e4ca6d98 2231
c74e560c 2232 if (sdulen)
03a51213 2233 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2234
47d1ec61 2235 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2236 hlen += L2CAP_FCS_SIZE;
fcc203c3 2237
1c2acffb 2238 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2239
2240 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2241 msg->msg_flags & MSG_DONTWAIT);
2242 if (IS_ERR(skb))
2243 return skb;
1c2acffb
GP		 2244
2245 /* Create L2CAP header */
2246 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2247 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2248 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2249
18a48e76
MM		 2250 /* Control header is populated later */
2251 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2252 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2253 else
2254 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2255
c74e560c 2256 if (sdulen)
03a51213 2257 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2258
0952a57a 2259 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2260 if (unlikely(err < 0)) {
2261 kfree_skb(skb);
2262 return ERR_PTR(err);
2263 }
e90bac06 2264
18a48e76 2265 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2266 bt_cb(skb)->control.retries = 0;
1c2acffb 2267 return skb;
1da177e4
LT		 2268}
2269
94122bbe
MM		 2270static int l2cap_segment_sdu(struct l2cap_chan *chan,
2271 struct sk_buff_head *seg_queue,
2272 struct msghdr *msg, size_t len)
c74e560c 2273{
c74e560c 2274 struct sk_buff *skb;
94122bbe
MM		 2275 u16 sdu_len;
2276 size_t pdu_len;
94122bbe 2277 u8 sar;
c74e560c 2278
b4400672 2279 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2280
94122bbe
MM		 2281 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2282 * so fragmented skbs are not used. The HCI layer's handling
2283 * of fragmented skbs is not compatible with ERTM's queueing.
2284 */
c74e560c 2285
94122bbe
MM		 2286 /* PDU size is derived from the HCI MTU */
2287 pdu_len = chan->conn->mtu;
c74e560c 2288
a549574d
MM		 2289 /* Constrain PDU size for BR/EDR connections */
2290 if (!chan->hs_hcon)
2291 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2292
2293 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2294 if (chan->fcs)
2295 pdu_len -= L2CAP_FCS_SIZE;
2296
ba7aa64f 2297 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2298
2299 /* Remote device may have requested smaller PDUs */
2300 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2301
2302 if (len <= pdu_len) {
2303 sar = L2CAP_SAR_UNSEGMENTED;
2304 sdu_len = 0;
2305 pdu_len = len;
2306 } else {
2307 sar = L2CAP_SAR_START;
2308 sdu_len = len;
2309 pdu_len -= L2CAP_SDULEN_SIZE;
2310 }
2311
2312 while (len > 0) {
2313 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2314
c74e560c 2315 if (IS_ERR(skb)) {
94122bbe 2316 __skb_queue_purge(seg_queue);
c74e560c
GP		 2317 return PTR_ERR(skb);
2318 }
2319
94122bbe
MM		 2320 bt_cb(skb)->control.sar = sar;
2321 __skb_queue_tail(seg_queue, skb);
2322
2323 len -= pdu_len;
2324 if (sdu_len) {
2325 sdu_len = 0;
2326 pdu_len += L2CAP_SDULEN_SIZE;
2327 }
2328
2329 if (len <= pdu_len) {
2330 sar = L2CAP_SAR_END;
2331 pdu_len = len;
2332 } else {
2333 sar = L2CAP_SAR_CONTINUE;
2334 }
c74e560c 2335 }
c74e560c 2336
f0f62799 2337 return 0;
c74e560c
GP		 2338}
2339
5e59b791 2340int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2341 u32 priority)
9a91a04a 2342{
9a91a04a 2343 struct sk_buff *skb;
9a91a04a 2344 int err;
94122bbe 2345 struct sk_buff_head seg_queue;
9a91a04a
GP		 2346
2347 /* Connectionless channel */
715ec005 2348 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2349 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2350 if (IS_ERR(skb))
2351 return PTR_ERR(skb);
2352
2353 l2cap_do_send(chan, skb);
2354 return len;
2355 }
2356
2357 switch (chan->mode) {
2358 case L2CAP_MODE_BASIC:
2359 /* Check outgoing MTU */
2360 if (len > chan->omtu)
2361 return -EMSGSIZE;
2362
2363 /* Create a basic PDU */
5e59b791 2364 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2365 if (IS_ERR(skb))
2366 return PTR_ERR(skb);
2367
2368 l2cap_do_send(chan, skb);
2369 err = len;
2370 break;
2371
2372 case L2CAP_MODE_ERTM:
2373 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2374 /* Check outgoing MTU */
2375 if (len > chan->omtu) {
2376 err = -EMSGSIZE;
2377 break;
2378 }
9a91a04a 2379
94122bbe 2380 __skb_queue_head_init(&seg_queue);
9a91a04a 2381
94122bbe
MM		 2382 /* Do segmentation before calling in to the state machine,
2383 * since it's possible to block while waiting for memory
2384 * allocation.
2385 */
2386 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2387
94122bbe
MM		 2388 /* The channel could have been closed while segmenting,
2389 * check that it is still connected.
2390 */
2391 if (chan->state != BT_CONNECTED) {
2392 __skb_queue_purge(&seg_queue);
2393 err = -ENOTCONN;
9a91a04a
GP		 2394 }
2395
94122bbe 2396 if (err)
9a91a04a 2397 break;
9a91a04a 2398
3733937d 2399 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2400 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2401 else
d660366d 2402 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2403
d660366d 2404 err = len;
9a91a04a 2405
94122bbe
MM		 2406 /* If the skbs were not queued for sending, they'll still be in
2407 * seg_queue and need to be purged.
2408 */
2409 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2410 break;
2411
2412 default:
2413 BT_DBG("bad state %1.1x", chan->mode);
2414 err = -EBADFD;
2415 }
2416
2417 return err;
2418}
2419
d2a7ac5d
MM		 2420static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2421{
bed68bde
MM		 2422 struct l2cap_ctrl control;
2423 u16 seq;
2424
b4400672 2425 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2426
2427 memset(&control, 0, sizeof(control));
2428 control.sframe = 1;
2429 control.super = L2CAP_SUPER_SREJ;
2430
2431 for (seq = chan->expected_tx_seq; seq != txseq;
2432 seq = __next_seq(chan, seq)) {
2433 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2434 control.reqseq = seq;
2435 l2cap_send_sframe(chan, &control);
2436 l2cap_seq_list_append(&chan->srej_list, seq);
2437 }
2438 }
2439
2440 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2441}
2442
2443static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2444{
bed68bde
MM		 2445 struct l2cap_ctrl control;
2446
2447 BT_DBG("chan %p", chan);
2448
2449 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2450 return;
2451
2452 memset(&control, 0, sizeof(control));
2453 control.sframe = 1;
2454 control.super = L2CAP_SUPER_SREJ;
2455 control.reqseq = chan->srej_list.tail;
2456 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2457}
2458
2459static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2460{
bed68bde
MM		 2461 struct l2cap_ctrl control;
2462 u16 initial_head;
2463 u16 seq;
2464
b4400672 2465 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2466
2467 memset(&control, 0, sizeof(control));
2468 control.sframe = 1;
2469 control.super = L2CAP_SUPER_SREJ;
2470
2471 /* Capture initial list head to allow only one pass through the list. */
2472 initial_head = chan->srej_list.head;
2473
2474 do {
2475 seq = l2cap_seq_list_pop(&chan->srej_list);
2476 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2477 break;
2478
2479 control.reqseq = seq;
2480 l2cap_send_sframe(chan, &control);
2481 l2cap_seq_list_append(&chan->srej_list, seq);
2482 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2483}
2484
608bcc6d
MM		 2485static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2486{
2487 struct sk_buff *acked_skb;
2488 u16 ackseq;
2489
b4400672 2490 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2491
2492 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2493 return;
2494
b4400672 2495 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2496 chan->expected_ack_seq, chan->unacked_frames);
2497
2498 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2499 ackseq = __next_seq(chan, ackseq)) {
2500
2501 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2502 if (acked_skb) {
2503 skb_unlink(acked_skb, &chan->tx_q);
2504 kfree_skb(acked_skb);
2505 chan->unacked_frames--;
2506 }
2507 }
2508
2509 chan->expected_ack_seq = reqseq;
2510
2511 if (chan->unacked_frames == 0)
2512 __clear_retrans_timer(chan);
2513
b4400672 2514 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2515}
2516
2517static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2518{
2519 BT_DBG("chan %p", chan);
2520
2521 chan->expected_tx_seq = chan->buffer_seq;
2522 l2cap_seq_list_clear(&chan->srej_list);
2523 skb_queue_purge(&chan->srej_q);
2524 chan->rx_state = L2CAP_RX_STATE_RECV;
2525}
2526
d660366d
GP		 2527static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2528 struct l2cap_ctrl *control,
2529 struct sk_buff_head *skbs, u8 event)
608bcc6d 2530{
608bcc6d
MM		 2531 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2532 event);
2533
2534 switch (event) {
2535 case L2CAP_EV_DATA_REQUEST:
2536 if (chan->tx_send_head == NULL)
2537 chan->tx_send_head = skb_peek(skbs);
2538
2539 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2540 l2cap_ertm_send(chan);
2541 break;
2542 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2543 BT_DBG("Enter LOCAL_BUSY");
2544 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2545
2546 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2547 /* The SREJ_SENT state must be aborted if we are to
2548 * enter the LOCAL_BUSY state.
2549 */
2550 l2cap_abort_rx_srej_sent(chan);
2551 }
2552
2553 l2cap_send_ack(chan);
2554
2555 break;
2556 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2557 BT_DBG("Exit LOCAL_BUSY");
2558 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2559
2560 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2561 struct l2cap_ctrl local_control;
2562
2563 memset(&local_control, 0, sizeof(local_control));
2564 local_control.sframe = 1;
2565 local_control.super = L2CAP_SUPER_RR;
2566 local_control.poll = 1;
2567 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2568 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2569
2570 chan->retry_count = 1;
2571 __set_monitor_timer(chan);
2572 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2573 }
2574 break;
2575 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2576 l2cap_process_reqseq(chan, control->reqseq);
2577 break;
2578 case L2CAP_EV_EXPLICIT_POLL:
2579 l2cap_send_rr_or_rnr(chan, 1);
2580 chan->retry_count = 1;
2581 __set_monitor_timer(chan);
2582 __clear_ack_timer(chan);
2583 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2584 break;
2585 case L2CAP_EV_RETRANS_TO:
2586 l2cap_send_rr_or_rnr(chan, 1);
2587 chan->retry_count = 1;
2588 __set_monitor_timer(chan);
2589 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2590 break;
2591 case L2CAP_EV_RECV_FBIT:
2592 /* Nothing to process */
2593 break;
2594 default:
2595 break;
2596 }
608bcc6d
MM		 2597}
2598
d660366d
GP		 2599static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2600 struct l2cap_ctrl *control,
2601 struct sk_buff_head *skbs, u8 event)
608bcc6d 2602{
608bcc6d
MM		 2603 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2604 event);
2605
2606 switch (event) {
2607 case L2CAP_EV_DATA_REQUEST:
2608 if (chan->tx_send_head == NULL)
2609 chan->tx_send_head = skb_peek(skbs);
2610 /* Queue data, but don't send. */
2611 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2612 break;
2613 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2614 BT_DBG("Enter LOCAL_BUSY");
2615 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2616
2617 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2618 /* The SREJ_SENT state must be aborted if we are to
2619 * enter the LOCAL_BUSY state.
2620 */
2621 l2cap_abort_rx_srej_sent(chan);
2622 }
2623
2624 l2cap_send_ack(chan);
2625
2626 break;
2627 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2628 BT_DBG("Exit LOCAL_BUSY");
2629 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2630
2631 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2632 struct l2cap_ctrl local_control;
2633 memset(&local_control, 0, sizeof(local_control));
2634 local_control.sframe = 1;
2635 local_control.super = L2CAP_SUPER_RR;
2636 local_control.poll = 1;
2637 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2638 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2639
2640 chan->retry_count = 1;
2641 __set_monitor_timer(chan);
2642 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2643 }
2644 break;
2645 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2646 l2cap_process_reqseq(chan, control->reqseq);
2647
2648 /* Fall through */
2649
2650 case L2CAP_EV_RECV_FBIT:
2651 if (control && control->final) {
2652 __clear_monitor_timer(chan);
2653 if (chan->unacked_frames > 0)
2654 __set_retrans_timer(chan);
2655 chan->retry_count = 0;
2656 chan->tx_state = L2CAP_TX_STATE_XMIT;
2657 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2658 }
2659 break;
2660 case L2CAP_EV_EXPLICIT_POLL:
2661 /* Ignore */
2662 break;
2663 case L2CAP_EV_MONITOR_TO:
2664 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2665 l2cap_send_rr_or_rnr(chan, 1);
2666 __set_monitor_timer(chan);
2667 chan->retry_count++;
2668 } else {
5e4e3972 2669 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2670 }
2671 break;
2672 default:
2673 break;
2674 }
608bcc6d
MM		 2675}
2676
d660366d
GP		 2677static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2678 struct sk_buff_head *skbs, u8 event)
608bcc6d 2679{
608bcc6d
MM		 2680 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2681 chan, control, skbs, event, chan->tx_state);
2682
2683 switch (chan->tx_state) {
2684 case L2CAP_TX_STATE_XMIT:
d660366d 2685 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2686 break;
2687 case L2CAP_TX_STATE_WAIT_F:
d660366d 2688 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2689 break;
2690 default:
2691 /* Ignore event */
2692 break;
2693 }
608bcc6d
MM		 2694}
2695
4b51dae9
MM		 2696static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2697 struct l2cap_ctrl *control)
2698{
2699 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2700 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2701}
2702
f80842a8
MM		 2703static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2704 struct l2cap_ctrl *control)
2705{
2706 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2707 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2708}
2709
1da177e4
LT		 2710/* Copy frame to all raw sockets on that connection */
2711static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2712{
1da177e4 2713 struct sk_buff *nskb;
48454079 2714 struct l2cap_chan *chan;
1da177e4
LT		 2715
2716 BT_DBG("conn %p", conn);
2717
3df91ea2 2718 mutex_lock(&conn->chan_lock);
3d57dc68 2719
3df91ea2 2720 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2721 struct sock *sk = chan->sk;
715ec005 2722 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2723 continue;
2724
2725 /* Don't send frame to the socket it came from */
2726 if (skb->sk == sk)
2727 continue;
8bcde1f2 2728 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2729 if (!nskb)
1da177e4
LT		 2730 continue;
2731
80b98027 2732 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2733 kfree_skb(nskb);
2734 }
3d57dc68 2735
3df91ea2 2736 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2737}
2738
2739/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2740static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2741 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2742{
2743 struct sk_buff *skb, **frag;
2744 struct l2cap_cmd_hdr *cmd;
2745 struct l2cap_hdr *lh;
2746 int len, count;
2747
b4400672
AE		 2748 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2749 conn, code, ident, dlen);
1da177e4
LT		 2750
2751 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2752 count = min_t(unsigned int, conn->mtu, len);
2753
8bcde1f2 2754 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2755 if (!skb)
2756 return NULL;
2757
2758 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2759 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2760
2761 if (conn->hcon->type == LE_LINK)
ac73498c 2762 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2763 else
ac73498c 2764 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2765
2766 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2767 cmd->code = code;
2768 cmd->ident = ident;
aca3192c 2769 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2770
2771 if (dlen) {
2772 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2773 memcpy(skb_put(skb, count), data, count);
2774 data += count;
2775 }
2776
2777 len -= skb->len;
2778
2779 /* Continuation fragments (no L2CAP header) */
2780 frag = &skb_shinfo(skb)->frag_list;
2781 while (len) {
2782 count = min_t(unsigned int, conn->mtu, len);
2783
8bcde1f2 2784 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2785 if (!*frag)
2786 goto fail;
2787
2788 memcpy(skb_put(*frag, count), data, count);
2789
2790 len -= count;
2791 data += count;
2792
2793 frag = &(*frag)->next;
2794 }
2795
2796 return skb;
2797
2798fail:
2799 kfree_skb(skb);
2800 return NULL;
2801}
2802
2d792818
GP		 2803static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2804 unsigned long *val)
1da177e4
LT		 2805{
2806 struct l2cap_conf_opt *opt = *ptr;
2807 int len;
2808
2809 len = L2CAP_CONF_OPT_SIZE + opt->len;
2810 *ptr += len;
2811
2812 *type = opt->type;
2813 *olen = opt->len;
2814
2815 switch (opt->len) {
2816 case 1:
2817 *val = *((u8 *) opt->val);
2818 break;
2819
2820 case 2:
bfaaeb3e 2821 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2822 break;
2823
2824 case 4:
bfaaeb3e 2825 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2826 break;
2827
2828 default:
2829 *val = (unsigned long) opt->val;
2830 break;
2831 }
2832
b4400672 2833 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2834 return len;
2835}
2836
1da177e4
LT		 2837static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2838{
2839 struct l2cap_conf_opt *opt = *ptr;
2840
b4400672 2841 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2842
2843 opt->type = type;
2844 opt->len = len;
2845
2846 switch (len) {
2847 case 1:
2848 *((u8 *) opt->val) = val;
2849 break;
2850
2851 case 2:
4f8b691c 2852 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2853 break;
2854
2855 case 4:
4f8b691c 2856 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2857 break;
2858
2859 default:
2860 memcpy(opt->val, (void *) val, len);
2861 break;
2862 }
2863
2864 *ptr += L2CAP_CONF_OPT_SIZE + len;
2865}
2866
f89cef09
AE		 2867static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2868{
2869 struct l2cap_conf_efs efs;
2870
1ec918ce 2871 switch (chan->mode) {
f89cef09
AE		 2872 case L2CAP_MODE_ERTM:
2873 efs.id = chan->local_id;
2874 efs.stype = chan->local_stype;
2875 efs.msdu = cpu_to_le16(chan->local_msdu);
2876 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 2877 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 2878 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 2879 break;
2880
2881 case L2CAP_MODE_STREAMING:
2882 efs.id = 1;
2883 efs.stype = L2CAP_SERV_BESTEFFORT;
2884 efs.msdu = cpu_to_le16(chan->local_msdu);
2885 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2886 efs.acc_lat = 0;
2887 efs.flush_to = 0;
2888 break;
2889
2890 default:
2891 return;
2892 }
2893
2894 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 2895 (unsigned long) &efs);
f89cef09
AE		 2896}
2897
721c4181 2898static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 2899{
721c4181 2900 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 2901 ack_timer.work);
2902 u16 frames_to_ack;
c1b4f43b 2903
2fb9b3d4
GP		 2904 BT_DBG("chan %p", chan);
2905
6be36555
AE		 2906 l2cap_chan_lock(chan);
2907
0362520b
MM		 2908 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2909 chan->last_acked_seq);
6be36555 2910
0362520b
MM		 2911 if (frames_to_ack)
2912 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 2913
0362520b 2914 l2cap_chan_unlock(chan);
09bfb2ee 2915 l2cap_chan_put(chan);
c1b4f43b
GP		 2916}
2917
466f8004 2918int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 2919{
3c588192
MM		 2920 int err;
2921
105bdf9e
MM		 2922 chan->next_tx_seq = 0;
2923 chan->expected_tx_seq = 0;
42e5c802 2924 chan->expected_ack_seq = 0;
6a026610 2925 chan->unacked_frames = 0;
42e5c802 2926 chan->buffer_seq = 0;
6a026610 2927 chan->frames_sent = 0;
105bdf9e
MM		 2928 chan->last_acked_seq = 0;
2929 chan->sdu = NULL;
2930 chan->sdu_last_frag = NULL;
2931 chan->sdu_len = 0;
2932
d34c34fb
MM		 2933 skb_queue_head_init(&chan->tx_q);
2934
08333283
MM		 2935 chan->local_amp_id = 0;
2936 chan->move_id = 0;
2937 chan->move_state = L2CAP_MOVE_STABLE;
2938 chan->move_role = L2CAP_MOVE_ROLE_NONE;
2939
105bdf9e
MM		 2940 if (chan->mode != L2CAP_MODE_ERTM)
2941 return 0;
2942
2943 chan->rx_state = L2CAP_RX_STATE_RECV;
2944 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 2945
721c4181
GP		 2946 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2947 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2948 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 2949
f1c6775b 2950 skb_queue_head_init(&chan->srej_q);
1890d36b 2951
3c588192
MM		 2952 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
2953 if (err < 0)
2954 return err;
2955
9dc9affc
MM		 2956 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
2957 if (err < 0)
2958 l2cap_seq_list_free(&chan->srej_list);
2959
2960 return err;
0565c1c2
GP		 2961}
2962
f2fcfcd6
GP		 2963static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2964{
2965 switch (mode) {
2966 case L2CAP_MODE_STREAMING:
2967 case L2CAP_MODE_ERTM:
2968 if (l2cap_mode_supported(mode, remote_feat_mask))
2969 return mode;
2970 /* fall through */
2971 default:
2972 return L2CAP_MODE_BASIC;
2973 }
2974}
2975
6327eb98
AE		 2976static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2977{
2978 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2979}
2980
f89cef09
AE		 2981static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2982{
2983 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2984}
2985
36c86c85
MM		 2986static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
2987 struct l2cap_conf_rfc *rfc)
2988{
2989 if (chan->local_amp_id && chan->hs_hcon) {
2990 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
2991
2992 /* Class 1 devices have must have ERTM timeouts
2993 * exceeding the Link Supervision Timeout. The
2994 * default Link Supervision Timeout for AMP
2995 * controllers is 10 seconds.
2996 *
2997 * Class 1 devices use 0xffffffff for their
2998 * best-effort flush timeout, so the clamping logic
2999 * will result in a timeout that meets the above
3000 * requirement. ERTM timeouts are 16-bit values, so
3001 * the maximum timeout is 65.535 seconds.
3002 */
3003
3004 /* Convert timeout to milliseconds and round */
3005 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3006
3007 /* This is the recommended formula for class 2 devices
3008 * that start ERTM timers when packets are sent to the
3009 * controller.
3010 */
3011 ertm_to = 3 * ertm_to + 500;
3012
3013 if (ertm_to > 0xffff)
3014 ertm_to = 0xffff;
3015
3016 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3017 rfc->monitor_timeout = rfc->retrans_timeout;
3018 } else {
3019 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3020 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3021 }
3022}
3023
6327eb98
AE		 3024static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3025{
3026 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
2d792818 3027 __l2cap_ews_supported(chan)) {
6327eb98
AE		 3028 /* use extended control field */
3029 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3030 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3031 } else {
6327eb98 3032 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3033 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3034 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3035 }
c20f8e35 3036 chan->ack_win = chan->tx_win;
6327eb98
AE		 3037}
3038
710f9b0a 3039static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3040{
1da177e4 3041 struct l2cap_conf_req *req = data;
0c1bc5c6 3042 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3043 void *ptr = req->data;
c8f79162 3044 u16 size;
1da177e4 3045
49208c9c 3046 BT_DBG("chan %p", chan);
1da177e4 3047
73ffa904 3048 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3049 goto done;
3050
0c1bc5c6 3051 switch (chan->mode) {
f2fcfcd6
GP		 3052 case L2CAP_MODE_STREAMING:
3053 case L2CAP_MODE_ERTM:
c1360a1c 3054 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3055 break;
85eb53c6 3056
f89cef09
AE		 3057 if (__l2cap_efs_supported(chan))
3058 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3059
2ba13ed6 3060 /* fall through */
f2fcfcd6 3061 default:
8c1d787b 3062 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3063 break;
3064 }
3065
3066done:
0c1bc5c6
GP		 3067 if (chan->imtu != L2CAP_DEFAULT_MTU)
3068 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3069
0c1bc5c6 3070 switch (chan->mode) {
65c7c491 3071 case L2CAP_MODE_BASIC:
8c1d787b 3072 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3073 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3074 break;
3075
62547752
GP		 3076 rfc.mode = L2CAP_MODE_BASIC;
3077 rfc.txwin_size = 0;
3078 rfc.max_transmit = 0;
3079 rfc.retrans_timeout = 0;
3080 rfc.monitor_timeout = 0;
3081 rfc.max_pdu_size = 0;
3082
63406504 3083 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3084 (unsigned long) &rfc);
65c7c491
MH		 3085 break;
3086
3087 case L2CAP_MODE_ERTM:
3088 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3089 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3090
3091 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3092
3093 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3094 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3095 L2CAP_FCS_SIZE);
c8f79162 3096 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3097
6327eb98
AE		 3098 l2cap_txwin_setup(chan);
3099
3100 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3101 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3102
63406504 3103 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3104 (unsigned long) &rfc);
63406504 3105
f89cef09
AE		 3106 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3107 l2cap_add_opt_efs(&ptr, chan);
3108
6327eb98
AE		 3109 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3110 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3111 chan->tx_win);
60918918
AE		 3112
3113 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3114 if (chan->fcs == L2CAP_FCS_NONE ||
3115 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
3116 chan->fcs = L2CAP_FCS_NONE;
3117 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3118 chan->fcs);
3119 }
f2fcfcd6
GP		 3120 break;
3121
3122 case L2CAP_MODE_STREAMING:
273759e2 3123 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3124 rfc.mode = L2CAP_MODE_STREAMING;
3125 rfc.txwin_size = 0;
3126 rfc.max_transmit = 0;
3127 rfc.retrans_timeout = 0;
3128 rfc.monitor_timeout = 0;
c8f79162
AE		 3129
3130 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3131 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3132 L2CAP_FCS_SIZE);
c8f79162 3133 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3134
63406504 3135 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3136 (unsigned long) &rfc);
63406504 3137
f89cef09
AE		 3138 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3139 l2cap_add_opt_efs(&ptr, chan);
3140
60918918
AE		 3141 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3142 if (chan->fcs == L2CAP_FCS_NONE ||
3143 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
3144 chan->fcs = L2CAP_FCS_NONE;
3145 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3146 chan->fcs);
3147 }
65c7c491
MH		 3148 break;
3149 }
1da177e4 3150
fe4128e0 3151 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3152 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3153
3154 return ptr - data;
3155}
3156
73ffa904 3157static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3158{
5dee9e7c
MH		 3159 struct l2cap_conf_rsp *rsp = data;
3160 void *ptr = rsp->data;
73ffa904
GP		 3161 void *req = chan->conf_req;
3162 int len = chan->conf_len;
5dee9e7c
MH		 3163 int type, hint, olen;
3164 unsigned long val;
6464f35f 3165 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3166 struct l2cap_conf_efs efs;
3167 u8 remote_efs = 0;
861d6882 3168 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3169 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3170 u16 size;
1da177e4 3171
73ffa904 3172 BT_DBG("chan %p", chan);
820ae1b8 3173
5dee9e7c
MH		 3174 while (len >= L2CAP_CONF_OPT_SIZE) {
3175 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3176
589d2746 3177 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3178 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3179
3180 switch (type) {
3181 case L2CAP_CONF_MTU:
861d6882 3182 mtu = val;
5dee9e7c
MH		 3183 break;
3184
3185 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3186 chan->flush_to = val;
5dee9e7c
MH		 3187 break;
3188
3189 case L2CAP_CONF_QOS:
3190 break;
3191
6464f35f
MH		 3192 case L2CAP_CONF_RFC:
3193 if (olen == sizeof(rfc))
3194 memcpy(&rfc, (void *) val, olen);
3195 break;
3196
fcc203c3
GP		 3197 case L2CAP_CONF_FCS:
3198 if (val == L2CAP_FCS_NONE)
c1360a1c 3199 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 3200 break;
fcc203c3 3201
42dceae2
AE		 3202 case L2CAP_CONF_EFS:
3203 remote_efs = 1;
3204 if (olen == sizeof(efs))
3205 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3206 break;
3207
6327eb98
AE		 3208 case L2CAP_CONF_EWS:
3209 if (!enable_hs)
3210 return -ECONNREFUSED;
fcc203c3 3211
6327eb98
AE		 3212 set_bit(FLAG_EXT_CTRL, &chan->flags);
3213 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3214 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3215 chan->remote_tx_win = val;
fcc203c3
GP		 3216 break;
3217
5dee9e7c
MH		 3218 default:
3219 if (hint)
3220 break;
3221
3222 result = L2CAP_CONF_UNKNOWN;
3223 *((u8 *) ptr++) = type;
3224 break;
3225 }
3226 }
3227
73ffa904 3228 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3229 goto done;
3230
0c1bc5c6 3231 switch (chan->mode) {
f2fcfcd6
GP		 3232 case L2CAP_MODE_STREAMING:
3233 case L2CAP_MODE_ERTM:
c1360a1c 3234 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3235 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3236 chan->conn->feat_mask);
85eb53c6
GP		 3237 break;
3238 }
3239
42dceae2
AE		 3240 if (remote_efs) {
3241 if (__l2cap_efs_supported(chan))
3242 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3243 else
3244 return -ECONNREFUSED;
3245 }
3246
0c1bc5c6 3247 if (chan->mode != rfc.mode)
f2fcfcd6 3248 return -ECONNREFUSED;
742e519b 3249
f2fcfcd6 3250 break;
f2fcfcd6
GP		 3251 }
3252
3253done:
0c1bc5c6 3254 if (chan->mode != rfc.mode) {
f2fcfcd6 3255 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3256 rfc.mode = chan->mode;
f2fcfcd6 3257
73ffa904 3258 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3259 return -ECONNREFUSED;
3260
2d792818
GP		 3261 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3262 (unsigned long) &rfc);
f2fcfcd6
GP		 3263 }
3264
5dee9e7c
MH		 3265 if (result == L2CAP_CONF_SUCCESS) {
3266 /* Configure output options and let the other side know
3267 * which ones we don't like. */
3268
f2fcfcd6
GP		 3269 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3270 result = L2CAP_CONF_UNACCEPT;
3271 else {
0c1bc5c6 3272 chan->omtu = mtu;
c1360a1c 3273 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3274 }
0c1bc5c6 3275 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3276
42dceae2
AE		 3277 if (remote_efs) {
3278 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3279 efs.stype != L2CAP_SERV_NOTRAFIC &&
3280 efs.stype != chan->local_stype) {
42dceae2
AE		 3281
3282 result = L2CAP_CONF_UNACCEPT;
3283
3284 if (chan->num_conf_req >= 1)
3285 return -ECONNREFUSED;
3286
3287 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3288 sizeof(efs),
3289 (unsigned long) &efs);
0e8b207e 3290 } else {
3e6b3b95 3291 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3292 result = L2CAP_CONF_PENDING;
3293 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3294 }
3295 }
3296
f2fcfcd6
GP		 3297 switch (rfc.mode) {
3298 case L2CAP_MODE_BASIC:
47d1ec61 3299 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3300 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3301 break;
3302
3303 case L2CAP_MODE_ERTM:
6327eb98
AE		 3304 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3305 chan->remote_tx_win = rfc.txwin_size;
3306 else
3307 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3308
2c03a7a4 3309 chan->remote_max_tx = rfc.max_transmit;
1c762159 3310
c8f79162 3311 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3312 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3313 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3314 rfc.max_pdu_size = cpu_to_le16(size);
3315 chan->remote_mps = size;
f2fcfcd6 3316
36c86c85 3317 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3318
c1360a1c 3319 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3320
3321 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3322 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3323
42dceae2
AE		 3324 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3325 chan->remote_id = efs.id;
3326 chan->remote_stype = efs.stype;
3327 chan->remote_msdu = le16_to_cpu(efs.msdu);
3328 chan->remote_flush_to =
2d792818 3329 le32_to_cpu(efs.flush_to);
42dceae2 3330 chan->remote_acc_lat =
2d792818 3331 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3332 chan->remote_sdu_itime =
3333 le32_to_cpu(efs.sdu_itime);
3334 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3335 sizeof(efs),
3336 (unsigned long) &efs);
42dceae2 3337 }
f2fcfcd6
GP		 3338 break;
3339
3340 case L2CAP_MODE_STREAMING:
c8f79162 3341 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3342 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3343 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3344 rfc.max_pdu_size = cpu_to_le16(size);
3345 chan->remote_mps = size;
f2fcfcd6 3346
c1360a1c 3347 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3348
2d792818
GP		 3349 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3350 (unsigned long) &rfc);
68ae6639 3351
f2fcfcd6
GP		 3352 break;
3353
3354 default:
5dee9e7c 3355 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3356
6464f35f 3357 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3358 rfc.mode = chan->mode;
f2fcfcd6 3359 }
6464f35f 3360
f2fcfcd6 3361 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3362 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3363 }
fe4128e0 3364 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3365 rsp->result = cpu_to_le16(result);
59e54bd1 3366 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3367
3368 return ptr - data;
1da177e4
LT		 3369}
3370
2d792818
GP		 3371static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3372 void *data, u16 *result)
f2fcfcd6 3373{
f2fcfcd6
GP		 3374 struct l2cap_conf_req *req = data;
3375 void *ptr = req->data;
3376 int type, olen;
3377 unsigned long val;
36e999a8 3378 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3379 struct l2cap_conf_efs efs;
f2fcfcd6 3380
fe4128e0 3381 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3382
3383 while (len >= L2CAP_CONF_OPT_SIZE) {
3384 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3385
3386 switch (type) {
3387 case L2CAP_CONF_MTU:
3388 if (val < L2CAP_DEFAULT_MIN_MTU) {
3389 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3390 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3391 } else
0c1bc5c6
GP		 3392 chan->imtu = val;
3393 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3394 break;
3395
3396 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3397 chan->flush_to = val;
f2fcfcd6 3398 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3399 2, chan->flush_to);
f2fcfcd6
GP		 3400 break;
3401
3402 case L2CAP_CONF_RFC:
3403 if (olen == sizeof(rfc))
3404 memcpy(&rfc, (void *)val, olen);
3405
c1360a1c 3406 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3407 rfc.mode != chan->mode)
f2fcfcd6
GP		 3408 return -ECONNREFUSED;
3409
47d1ec61 3410 chan->fcs = 0;
f2fcfcd6
GP		 3411
3412 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3413 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3414 break;
6327eb98
AE		 3415
3416 case L2CAP_CONF_EWS:
c20f8e35 3417 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3418 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3419 chan->tx_win);
6327eb98 3420 break;
66af7aaf
AE		 3421
3422 case L2CAP_CONF_EFS:
3423 if (olen == sizeof(efs))
3424 memcpy(&efs, (void *)val, olen);
3425
3426 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3427 efs.stype != L2CAP_SERV_NOTRAFIC &&
3428 efs.stype != chan->local_stype)
66af7aaf
AE		 3429 return -ECONNREFUSED;
3430
2d792818
GP		 3431 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3432 (unsigned long) &efs);
66af7aaf 3433 break;
f2fcfcd6
GP		 3434 }
3435 }
3436
0c1bc5c6 3437 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3438 return -ECONNREFUSED;
3439
0c1bc5c6 3440 chan->mode = rfc.mode;
6c2ea7a8 3441
0e8b207e 3442 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3443 switch (rfc.mode) {
3444 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3445 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3446 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3447 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3448 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3449 chan->ack_win = min_t(u16, chan->ack_win,
3450 rfc.txwin_size);
66af7aaf
AE		 3451
3452 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3453 chan->local_msdu = le16_to_cpu(efs.msdu);
3454 chan->local_sdu_itime =
2d792818 3455 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3456 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3457 chan->local_flush_to =
2d792818 3458 le32_to_cpu(efs.flush_to);
66af7aaf 3459 }
f2fcfcd6 3460 break;
66af7aaf 3461
f2fcfcd6 3462 case L2CAP_MODE_STREAMING:
47d1ec61 3463 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3464 }
3465 }
3466
fe4128e0 3467 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3468 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3469
3470 return ptr - data;
3471}
3472
2d792818
GP		 3473static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3474 u16 result, u16 flags)
1da177e4
LT		 3475{
3476 struct l2cap_conf_rsp *rsp = data;
3477 void *ptr = rsp->data;
1da177e4 3478
fe4128e0 3479 BT_DBG("chan %p", chan);
1da177e4 3480
fe4128e0 3481 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3482 rsp->result = cpu_to_le16(result);
aca3192c 3483 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3484
3485 return ptr - data;
3486}
3487
8c1d787b 3488void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3489{
3490 struct l2cap_conn_rsp rsp;
8c1d787b 3491 struct l2cap_conn *conn = chan->conn;
710f9b0a 3492 u8 buf[128];
439f34ac 3493 u8 rsp_code;
710f9b0a 3494
fe4128e0
GP		 3495 rsp.scid = cpu_to_le16(chan->dcid);
3496 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3497 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3498 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3499
3500 if (chan->hs_hcon)
3501 rsp_code = L2CAP_CREATE_CHAN_RSP;
3502 else
3503 rsp_code = L2CAP_CONN_RSP;
3504
3505 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3506
3507 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3508
c1360a1c 3509 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3510 return;
3511
710f9b0a 3512 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3513 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3514 chan->num_conf_req++;
3515}
3516
47d1ec61 3517static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3518{
7b1c0049
GP		 3519 int type, olen;
3520 unsigned long val;
c20f8e35
MM		 3521 /* Use sane default values in case a misbehaving remote device
3522 * did not send an RFC or extended window size option.
3523 */
3524 u16 txwin_ext = chan->ack_win;
3525 struct l2cap_conf_rfc rfc = {
3526 .mode = chan->mode,
3527 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3528 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3529 .max_pdu_size = cpu_to_le16(chan->imtu),
3530 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3531 };
7b1c0049 3532
47d1ec61 3533 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3534
0c1bc5c6 3535 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3536 return;
3537
3538 while (len >= L2CAP_CONF_OPT_SIZE) {
3539 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3540
c20f8e35
MM		 3541 switch (type) {
3542 case L2CAP_CONF_RFC:
3543 if (olen == sizeof(rfc))
3544 memcpy(&rfc, (void *)val, olen);
8f321f85 3545 break;
c20f8e35
MM		 3546 case L2CAP_CONF_EWS:
3547 txwin_ext = val;
3548 break;
3549 }
7b1c0049
GP		 3550 }
3551
7b1c0049
GP		 3552 switch (rfc.mode) {
3553 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3554 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3555 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3556 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3557 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3558 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3559 else
3560 chan->ack_win = min_t(u16, chan->ack_win,
3561 rfc.txwin_size);
7b1c0049
GP		 3562 break;
3563 case L2CAP_MODE_STREAMING:
47d1ec61 3564 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3565 }
3566}
3567
2d792818
GP		 3568static inline int l2cap_command_rej(struct l2cap_conn *conn,
3569 struct l2cap_cmd_hdr *cmd, u8 *data)
4e8402a3 3570{
e2fd318e 3571 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3572
e2fd318e 3573 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3574 return 0;
3575
3576 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3577 cmd->ident == conn->info_ident) {
17cd3f37 3578 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3579
3580 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3581 conn->info_ident = 0;
984947dc 3582
4e8402a3
MH		 3583 l2cap_conn_start(conn);
3584 }
3585
3586 return 0;
3587}
3588
1700915f
MM		 3589static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3590 struct l2cap_cmd_hdr *cmd,
3591 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3592{
1da177e4
LT		 3593 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3594 struct l2cap_conn_rsp rsp;
23691d75 3595 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3596 struct sock *parent, *sk = NULL;
e7c29cb1 3597 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3598
3599 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3600 __le16 psm = req->psm;
1da177e4 3601
097db76c 3602 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3603
3604 /* Check if we have socket listening on psm */
c2287681 3605 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 3606 if (!pchan) {
1da177e4
LT		 3607 result = L2CAP_CR_BAD_PSM;
3608 goto sendresp;
3609 }
3610
23691d75
GP		 3611 parent = pchan->sk;
3612
3df91ea2 3613 mutex_lock(&conn->chan_lock);
aa2ac881 3614 lock_sock(parent);
e0f0cb56 3615
e7c29cb1 3616 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3617 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3618 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3619 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3620 result = L2CAP_CR_SEC_BLOCK;
3621 goto response;
3622 }
3623
1da177e4
LT		 3624 result = L2CAP_CR_NO_MEM;
3625
2dfa1003
GP		 3626 /* Check if we already have channel with that dcid */
3627 if (__l2cap_get_chan_by_dcid(conn, scid))
3628 goto response;
3629
80b98027 3630 chan = pchan->ops->new_connection(pchan);
80808e43 3631 if (!chan)
1da177e4
LT		 3632 goto response;
3633
80808e43
GP		 3634 sk = chan->sk;
3635
1da177e4
LT		 3636 hci_conn_hold(conn->hcon);
3637
1da177e4
LT		 3638 bacpy(&bt_sk(sk)->src, conn->src);
3639 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3640 chan->psm = psm;
3641 chan->dcid = scid;
1700915f 3642 chan->local_amp_id = amp_id;
1da177e4 3643
6be36555 3644 __l2cap_chan_add(conn, chan);
48454079 3645
fe4128e0 3646 dcid = chan->scid;
1da177e4 3647
c9b66675 3648 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3649
fc7f8a7e 3650 chan->ident = cmd->ident;
1da177e4 3651
984947dc 3652 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3653 if (l2cap_chan_check_security(chan)) {
c5daa683 3654 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
0e587be7 3655 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3656 result = L2CAP_CR_PEND;
3657 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3658 chan->ops->defer(chan);
f66dc81f 3659 } else {
1700915f
MM		 3660 /* Force pending result for AMP controllers.
3661 * The connection will succeed after the
3662 * physical link is up.
3663 */
3664 if (amp_id) {
3665 __l2cap_state_change(chan, BT_CONNECT2);
3666 result = L2CAP_CR_PEND;
3667 } else {
3668 __l2cap_state_change(chan, BT_CONFIG);
3669 result = L2CAP_CR_SUCCESS;
3670 }
f66dc81f
MH		 3671 status = L2CAP_CS_NO_INFO;
3672 }
79d554a6 3673 } else {
0e587be7 3674 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3675 result = L2CAP_CR_PEND;
3676 status = L2CAP_CS_AUTHEN_PEND;
3677 }
3678 } else {
0e587be7 3679 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3680 result = L2CAP_CR_PEND;
3681 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3682 }
3683
1da177e4 3684response:
aa2ac881 3685 release_sock(parent);
3df91ea2 3686 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3687
3688sendresp:
aca3192c
YH		 3689 rsp.scid = cpu_to_le16(scid);
3690 rsp.dcid = cpu_to_le16(dcid);
3691 rsp.result = cpu_to_le16(result);
3692 rsp.status = cpu_to_le16(status);
4c89b6aa 3693 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3694
3695 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3696 struct l2cap_info_req info;
ac73498c 3697 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3698
3699 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3700 conn->info_ident = l2cap_get_ident(conn);
3701
ba13ccd9 3702 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3703
2d792818
GP		 3704 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3705 sizeof(info), &info);
79d554a6
MH		 3706 }
3707
c1360a1c 3708 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3709 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3710 u8 buf[128];
c1360a1c 3711 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3712 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3713 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3714 chan->num_conf_req++;
e9aeb2dd 3715 }
1700915f
MM		 3716
3717 return chan;
4c89b6aa 3718}
e9aeb2dd 3719
4c89b6aa
MM		 3720static int l2cap_connect_req(struct l2cap_conn *conn,
3721 struct l2cap_cmd_hdr *cmd, u8 *data)
3722{
300229f9 3723 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3724 return 0;
3725}
3726
5909cf30 3727static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
2d792818 3728 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 3729{
3730 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3731 u16 scid, dcid, result, status;
48454079 3732 struct l2cap_chan *chan;
1da177e4 3733 u8 req[128];
3df91ea2 3734 int err;
1da177e4
LT		 3735
3736 scid = __le16_to_cpu(rsp->scid);
3737 dcid = __le16_to_cpu(rsp->dcid);
3738 result = __le16_to_cpu(rsp->result);
3739 status = __le16_to_cpu(rsp->status);
3740
1b009c98 3741 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3742 dcid, scid, result, status);
1da177e4 3743
3df91ea2
AE		 3744 mutex_lock(&conn->chan_lock);
3745
1da177e4 3746 if (scid) {
3df91ea2
AE		 3747 chan = __l2cap_get_chan_by_scid(conn, scid);
3748 if (!chan) {
3749 err = -EFAULT;
3750 goto unlock;
3751 }
1da177e4 3752 } else {
3df91ea2
AE		 3753 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3754 if (!chan) {
3755 err = -EFAULT;
3756 goto unlock;
3757 }
1da177e4
LT		 3758 }
3759
3df91ea2
AE		 3760 err = 0;
3761
6be36555 3762 l2cap_chan_lock(chan);
48454079 3763
1da177e4
LT		 3764 switch (result) {
3765 case L2CAP_CR_SUCCESS:
89bc500e 3766 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3767 chan->ident = 0;
fe4128e0 3768 chan->dcid = dcid;
c1360a1c 3769 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3770
c1360a1c 3771 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3772 break;
3773
1da177e4 3774 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3775 l2cap_build_conf_req(chan, req), req);
73ffa904 3776 chan->num_conf_req++;
1da177e4
LT		 3777 break;
3778
3779 case L2CAP_CR_PEND:
c1360a1c 3780 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3781 break;
3782
3783 default:
48454079 3784 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3785 break;
3786 }
3787
6be36555 3788 l2cap_chan_unlock(chan);
3df91ea2
AE		 3789
3790unlock:
3791 mutex_unlock(&conn->chan_lock);
3792
3793 return err;
1da177e4
LT		 3794}
3795
47d1ec61 3796static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3797{
3798 /* FCS is enabled only in ERTM or streaming mode, if one or both
3799 * sides request it.
3800 */
0c1bc5c6 3801 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3802 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3803 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 3804 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3805}
3806
29d8a590
AE		 3807static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3808 u8 ident, u16 flags)
3809{
3810 struct l2cap_conn *conn = chan->conn;
3811
3812 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3813 flags);
3814
3815 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3816 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3817
3818 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3819 l2cap_build_conf_rsp(chan, data,
3820 L2CAP_CONF_SUCCESS, flags), data);
3821}
3822
2d792818
GP		 3823static inline int l2cap_config_req(struct l2cap_conn *conn,
3824 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3825 u8 *data)
1da177e4
LT		 3826{
3827 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3828 u16 dcid, flags;
3829 u8 rsp[64];
48454079 3830 struct l2cap_chan *chan;
3c588192 3831 int len, err = 0;
1da177e4
LT		 3832
3833 dcid = __le16_to_cpu(req->dcid);
3834 flags = __le16_to_cpu(req->flags);
3835
3836 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3837
baa7e1fa 3838 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3839 if (!chan)
1da177e4
LT		 3840 return -ENOENT;
3841
033b1142 3842 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3843 struct l2cap_cmd_rej_cid rej;
3844
ac73498c 3845 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
e2fd318e
IK		 3846 rej.scid = cpu_to_le16(chan->scid);
3847 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3848
df6bd743 3849 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2d792818 3850 sizeof(rej), &rej);
354f60a9 3851 goto unlock;
df6bd743 3852 }
354f60a9 3853
5dee9e7c 3854 /* Reject if config buffer is too small. */
88219a0f 3855 len = cmd_len - sizeof(*req);
7ac28817 3856 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3857 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 3858 l2cap_build_conf_rsp(chan, rsp,
3859 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 3860 goto unlock;
3861 }
3862
3863 /* Store config. */
73ffa904
GP		 3864 memcpy(chan->conf_req + chan->conf_len, req->data, len);
3865 chan->conf_len += len;
1da177e4 3866
59e54bd1 3867 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 3868 /* Incomplete config. Send empty response. */
3869 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 3870 l2cap_build_conf_rsp(chan, rsp,
3871 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 3872 goto unlock;
3873 }
3874
3875 /* Complete config. */
73ffa904 3876 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 3877 if (len < 0) {
5e4e3972 3878 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 3879 goto unlock;
f2fcfcd6 3880 }
1da177e4 3881
1500109b 3882 chan->ident = cmd->ident;
5dee9e7c 3883 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 3884 chan->num_conf_rsp++;
5dee9e7c 3885
5dee9e7c 3886 /* Reset config buffer. */
73ffa904 3887 chan->conf_len = 0;
5dee9e7c 3888
c1360a1c 3889 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 3890 goto unlock;
3891
c1360a1c 3892 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 3893 set_default_fcs(chan);
fcc203c3 3894
105bdf9e
MM		 3895 if (chan->mode == L2CAP_MODE_ERTM ||
3896 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 3897 err = l2cap_ertm_init(chan);
3898
3899 if (err < 0)
5e4e3972 3900 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 3901 else
3902 l2cap_chan_ready(chan);
0565c1c2 3903
876d9484
MH		 3904 goto unlock;
3905 }
3906
c1360a1c 3907 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 3908 u8 buf[64];
1da177e4 3909 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3910 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3911 chan->num_conf_req++;
1da177e4
LT		 3912 }
3913
0e8b207e
AE		 3914 /* Got Conf Rsp PENDING from remote side and asume we sent
3915 Conf Rsp PENDING in the code above */
3916 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 3917 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 3918
3919 /* check compatibility */
3920
79de886d 3921 /* Send rsp for BR/EDR channel */
f351bc72 3922 if (!chan->hs_hcon)
79de886d
AE		 3923 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
3924 else
3925 chan->ident = cmd->ident;
0e8b207e
AE		 3926 }
3927
1da177e4 3928unlock:
6be36555 3929 l2cap_chan_unlock(chan);
3c588192 3930 return err;
1da177e4
LT		 3931}
3932
2d792818
GP		 3933static inline int l2cap_config_rsp(struct l2cap_conn *conn,
3934 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 3935{
3936 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3937 u16 scid, flags, result;
48454079 3938 struct l2cap_chan *chan;
61386cba 3939 int len = le16_to_cpu(cmd->len) - sizeof(*rsp);
3c588192 3940 int err = 0;
1da177e4
LT		 3941
3942 scid = __le16_to_cpu(rsp->scid);
3943 flags = __le16_to_cpu(rsp->flags);
3944 result = __le16_to_cpu(rsp->result);
3945
61386cba
AE		 3946 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
3947 result, len);
1da177e4 3948
baa7e1fa 3949 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3950 if (!chan)
1da177e4
LT		 3951 return 0;
3952
3953 switch (result) {
3954 case L2CAP_CONF_SUCCESS:
47d1ec61 3955 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 3956 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 3957 break;
3958
0e8b207e
AE		 3959 case L2CAP_CONF_PENDING:
3960 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
3961
3962 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3963 char buf[64];
3964
3965 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 3966 buf, &result);
0e8b207e 3967 if (len < 0) {
5e4e3972 3968 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 3969 goto done;
3970 }
3971
f351bc72 3972 if (!chan->hs_hcon) {
79de886d
AE		 3973 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
3974 0);
5ce66b59
AE		 3975 } else {
3976 if (l2cap_check_efs(chan)) {
3977 amp_create_logical_link(chan);
3978 chan->ident = cmd->ident;
3979 }
3980 }
0e8b207e
AE		 3981 }
3982 goto done;
3983
1da177e4 3984 case L2CAP_CONF_UNACCEPT:
73ffa904 3985 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3986 char req[64];
3987
c2c77ec8 3988 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 3989 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 3990 goto done;
3991 }
3992
f2fcfcd6
GP		 3993 /* throw out any old stored conf requests */
3994 result = L2CAP_CONF_SUCCESS;
b4450035 3995 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 3996 req, &result);
f2fcfcd6 3997 if (len < 0) {
5e4e3972 3998 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 3999 goto done;
4000 }
4001
4002 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4003 L2CAP_CONF_REQ, len, req);
73ffa904 4004 chan->num_conf_req++;
f2fcfcd6
GP		 4005 if (result != L2CAP_CONF_SUCCESS)
4006 goto done;
4007 break;
1da177e4
LT		 4008 }
4009
8e87d142 4010 default:
6be36555 4011 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4012
ba13ccd9 4013 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4014 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4015 goto done;
4016 }
4017
59e54bd1 4018 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4019 goto done;
4020
c1360a1c 4021 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4022
c1360a1c 4023 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4024 set_default_fcs(chan);
fcc203c3 4025
105bdf9e
MM		 4026 if (chan->mode == L2CAP_MODE_ERTM ||
4027 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4028 err = l2cap_ertm_init(chan);
0565c1c2 4029
3c588192 4030 if (err < 0)
5e4e3972 4031 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4032 else
4033 l2cap_chan_ready(chan);
1da177e4
LT		 4034 }
4035
4036done:
6be36555 4037 l2cap_chan_unlock(chan);
3c588192 4038 return err;
1da177e4
LT		 4039}
4040
2d792818
GP		 4041static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4042 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4043{
4044 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4045 struct l2cap_disconn_rsp rsp;
4046 u16 dcid, scid;
48454079 4047 struct l2cap_chan *chan;
1da177e4
LT		 4048 struct sock *sk;
4049
4050 scid = __le16_to_cpu(req->scid);
4051 dcid = __le16_to_cpu(req->dcid);
4052
4053 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4054
3df91ea2
AE		 4055 mutex_lock(&conn->chan_lock);
4056
4057 chan = __l2cap_get_chan_by_scid(conn, dcid);
4058 if (!chan) {
4059 mutex_unlock(&conn->chan_lock);
1da177e4 4060 return 0;
3df91ea2 4061 }
1da177e4 4062
6be36555
AE		 4063 l2cap_chan_lock(chan);
4064
48454079
GP		 4065 sk = chan->sk;
4066
fe4128e0
GP		 4067 rsp.dcid = cpu_to_le16(chan->scid);
4068 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4069 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4070
6be36555 4071 lock_sock(sk);
1da177e4 4072 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 4073 release_sock(sk);
1da177e4 4074
61d6ef3e 4075 l2cap_chan_hold(chan);
48454079 4076 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4077
4078 l2cap_chan_unlock(chan);
1da177e4 4079
80b98027 4080 chan->ops->close(chan);
61d6ef3e 4081 l2cap_chan_put(chan);
3df91ea2
AE		 4082
4083 mutex_unlock(&conn->chan_lock);
4084
1da177e4
LT		 4085 return 0;
4086}
4087
2d792818
GP		 4088static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4089 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4090{
4091 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4092 u16 dcid, scid;
48454079 4093 struct l2cap_chan *chan;
1da177e4
LT		 4094
4095 scid = __le16_to_cpu(rsp->scid);
4096 dcid = __le16_to_cpu(rsp->dcid);
4097
4098 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4099
3df91ea2
AE		 4100 mutex_lock(&conn->chan_lock);
4101
4102 chan = __l2cap_get_chan_by_scid(conn, scid);
4103 if (!chan) {
4104 mutex_unlock(&conn->chan_lock);
1da177e4 4105 return 0;
3df91ea2 4106 }
1da177e4 4107
6be36555 4108 l2cap_chan_lock(chan);
48454079 4109
61d6ef3e 4110 l2cap_chan_hold(chan);
48454079 4111 l2cap_chan_del(chan, 0);
6be36555
AE		 4112
4113 l2cap_chan_unlock(chan);
1da177e4 4114
80b98027 4115 chan->ops->close(chan);
61d6ef3e 4116 l2cap_chan_put(chan);
3df91ea2
AE		 4117
4118 mutex_unlock(&conn->chan_lock);
4119
1da177e4
LT		 4120 return 0;
4121}
4122
2d792818
GP		 4123static inline int l2cap_information_req(struct l2cap_conn *conn,
4124 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4125{
4126 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4127 u16 type;
4128
4129 type = __le16_to_cpu(req->type);
4130
4131 BT_DBG("type 0x%4.4x", type);
4132
f0709e03
MH		 4133 if (type == L2CAP_IT_FEAT_MASK) {
4134 u8 buf[8];
44dd46de 4135 u32 feat_mask = l2cap_feat_mask;
f0709e03 4136 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4137 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4138 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4139 if (!disable_ertm)
fcc203c3 4140 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4141 | L2CAP_FEAT_FCS;
a5fd6f30 4142 if (enable_hs)
6327eb98 4143 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4144 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4145
1b7bf4ed 4146 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4147 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4148 buf);
e1027a7c
MH		 4149 } else if (type == L2CAP_IT_FIXED_CHAN) {
4150 u8 buf[12];
4151 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 4152
4153 if (enable_hs)
4154 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4155 else
4156 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4157
ac73498c
AE		 4158 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4159 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4160 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4161 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4162 buf);
f0709e03
MH		 4163 } else {
4164 struct l2cap_info_rsp rsp;
4165 rsp.type = cpu_to_le16(type);
ac73498c 4166 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4167 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4168 &rsp);
f0709e03 4169 }
1da177e4
LT		 4170
4171 return 0;
4172}
4173
2d792818
GP		 4174static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4175 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4176{
4177 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4178 u16 type, result;
4179
4180 type = __le16_to_cpu(rsp->type);
4181 result = __le16_to_cpu(rsp->result);
4182
4183 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4184
e90165be
AE		 4185 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4186 if (cmd->ident != conn->info_ident ||
2d792818 4187 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4188 return 0;
4189
17cd3f37 4190 cancel_delayed_work(&conn->info_timer);
4e8402a3 4191
adb08ede
VT		 4192 if (result != L2CAP_IR_SUCCESS) {
4193 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4194 conn->info_ident = 0;
4195
4196 l2cap_conn_start(conn);
4197
4198 return 0;
4199 }
4200
978c93b9
AE		 4201 switch (type) {
4202 case L2CAP_IT_FEAT_MASK:
83985319 4203 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4204
47ec1dcd 4205 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4206 struct l2cap_info_req req;
ac73498c 4207 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4208
4209 conn->info_ident = l2cap_get_ident(conn);
4210
4211 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4212 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4213 } else {
4214 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4215 conn->info_ident = 0;
4216
4217 l2cap_conn_start(conn);
4218 }
978c93b9
AE		 4219 break;
4220
4221 case L2CAP_IT_FIXED_CHAN:
4222 conn->fixed_chan_mask = rsp->data[0];
984947dc 4223 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4224 conn->info_ident = 0;
984947dc
MH		 4225
4226 l2cap_conn_start(conn);
978c93b9 4227 break;
984947dc 4228 }
4e8402a3 4229
1da177e4
LT		 4230 return 0;
4231}
4232
1700915f
MM		 4233static int l2cap_create_channel_req(struct l2cap_conn *conn,
4234 struct l2cap_cmd_hdr *cmd,
4235 u16 cmd_len, void *data)
f94ff6ff
MM		 4236{
4237 struct l2cap_create_chan_req *req = data;
6e1df6a6 4238 struct l2cap_create_chan_rsp rsp;
1700915f 4239 struct l2cap_chan *chan;
6e1df6a6 4240 struct hci_dev *hdev;
f94ff6ff
MM		 4241 u16 psm, scid;
4242
4243 if (cmd_len != sizeof(*req))
4244 return -EPROTO;
4245
4246 if (!enable_hs)
4247 return -EINVAL;
4248
4249 psm = le16_to_cpu(req->psm);
4250 scid = le16_to_cpu(req->scid);
4251
ad0ac6ca 4252 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4253
6e1df6a6
AE		 4254 /* For controller id 0 make BR/EDR connection */
4255 if (req->amp_id == HCI_BREDR_ID) {
4256 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4257 req->amp_id);
4258 return 0;
4259 }
1700915f 4260
6e1df6a6
AE		 4261 /* Validate AMP controller id */
4262 hdev = hci_dev_get(req->amp_id);
4263 if (!hdev)
4264 goto error;
1700915f 4265
6e1df6a6
AE		 4266 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4267 hci_dev_put(hdev);
4268 goto error;
4269 }
1700915f 4270
6e1df6a6
AE		 4271 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4272 req->amp_id);
4273 if (chan) {
4274 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4275 struct hci_conn *hs_hcon;
1700915f 4276
6e1df6a6
AE		 4277 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst);
4278 if (!hs_hcon) {
4279 hci_dev_put(hdev);
4280 return -EFAULT;
1700915f
MM		 4281 }
4282
6e1df6a6
AE		 4283 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4284
6e1df6a6
AE		 4285 mgr->bredr_chan = chan;
4286 chan->hs_hcon = hs_hcon;
fd45bf4c 4287 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4288 conn->mtu = hdev->block_mtu;
1700915f 4289 }
f94ff6ff 4290
6e1df6a6 4291 hci_dev_put(hdev);
f94ff6ff
MM		 4292
4293 return 0;
6e1df6a6
AE		 4294
4295error:
4296 rsp.dcid = 0;
4297 rsp.scid = cpu_to_le16(scid);
4298 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4299 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4300
4301 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4302 sizeof(rsp), &rsp);
4303
4304 return -EFAULT;
f94ff6ff
MM		 4305}
4306
8eb200bd
MM		 4307static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4308{
4309 struct l2cap_move_chan_req req;
4310 u8 ident;
4311
4312 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4313
4314 ident = l2cap_get_ident(chan->conn);
4315 chan->ident = ident;
4316
4317 req.icid = cpu_to_le16(chan->scid);
4318 req.dest_amp_id = dest_amp_id;
4319
4320 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4321 &req);
4322
4323 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4324}
4325
1500109b 4326static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4327{
4328 struct l2cap_move_chan_rsp rsp;
4329
1500109b 4330 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4331
1500109b 4332 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4333 rsp.result = cpu_to_le16(result);
4334
1500109b
MM		 4335 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4336 sizeof(rsp), &rsp);
8d5a04a1
MM		 4337}
4338
5b155ef9 4339static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4340{
4341 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4342
5b155ef9 4343 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4344
5b155ef9 4345 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4346
5b155ef9 4347 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4348 cfm.result = cpu_to_le16(result);
4349
5b155ef9
MM		 4350 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4351 sizeof(cfm), &cfm);
4352
4353 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4354}
4355
4356static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4357{
4358 struct l2cap_move_chan_cfm cfm;
4359
4360 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4361
4362 cfm.icid = cpu_to_le16(icid);
4363 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4364
4365 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4366 sizeof(cfm), &cfm);
8d5a04a1
MM		 4367}
4368
4369static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4370 u16 icid)
8d5a04a1
MM		 4371{
4372 struct l2cap_move_chan_cfm_rsp rsp;
4373
ad0ac6ca 4374 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4375
4376 rsp.icid = cpu_to_le16(icid);
4377 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4378}
4379
5f3847a4
MM		 4380static void __release_logical_link(struct l2cap_chan *chan)
4381{
4382 chan->hs_hchan = NULL;
4383 chan->hs_hcon = NULL;
4384
4385 /* Placeholder - release the logical link */
4386}
4387
1500109b
MM		 4388static void l2cap_logical_fail(struct l2cap_chan *chan)
4389{
4390 /* Logical link setup failed */
4391 if (chan->state != BT_CONNECTED) {
4392 /* Create channel failure, disconnect */
5e4e3972 4393 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4394 return;
4395 }
4396
4397 switch (chan->move_role) {
4398 case L2CAP_MOVE_ROLE_RESPONDER:
4399 l2cap_move_done(chan);
4400 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4401 break;
4402 case L2CAP_MOVE_ROLE_INITIATOR:
4403 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4404 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4405 /* Remote has only sent pending or
4406 * success responses, clean up
4407 */
4408 l2cap_move_done(chan);
4409 }
4410
4411 /* Other amp move states imply that the move
4412 * has already aborted
4413 */
4414 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4415 break;
4416 }
4417}
4418
4419static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4420 struct hci_chan *hchan)
4421{
4422 struct l2cap_conf_rsp rsp;
1500109b 4423
336178a3 4424 chan->hs_hchan = hchan;
1500109b
MM		 4425 chan->hs_hcon->l2cap_data = chan->conn;
4426
35ba9561 4427 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4428
4429 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4430 int err;
1500109b
MM		 4431
4432 set_default_fcs(chan);
4433
4434 err = l2cap_ertm_init(chan);
4435 if (err < 0)
5e4e3972 4436 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4437 else
4438 l2cap_chan_ready(chan);
4439 }
4440}
4441
4442static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4443 struct hci_chan *hchan)
4444{
4445 chan->hs_hcon = hchan->conn;
4446 chan->hs_hcon->l2cap_data = chan->conn;
4447
4448 BT_DBG("move_state %d", chan->move_state);
4449
4450 switch (chan->move_state) {
4451 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4452 /* Move confirm will be sent after a success
4453 * response is received
4454 */
4455 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4456 break;
4457 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4458 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4459 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4460 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4461 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4462 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4463 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4464 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4465 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4466 }
4467 break;
4468 default:
4469 /* Move was not in expected state, free the channel */
4470 __release_logical_link(chan);
4471
4472 chan->move_state = L2CAP_MOVE_STABLE;
4473 }
4474}
4475
4476/* Call with chan locked */
27695fb4
AE		 4477void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4478 u8 status)
5b155ef9 4479{
1500109b
MM		 4480 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4481
4482 if (status) {
4483 l2cap_logical_fail(chan);
4484 __release_logical_link(chan);
4485 return;
4486 }
4487
4488 if (chan->state != BT_CONNECTED) {
4489 /* Ignore logical link if channel is on BR/EDR */
4490 if (chan->local_amp_id)
4491 l2cap_logical_finish_create(chan, hchan);
4492 } else {
4493 l2cap_logical_finish_move(chan, hchan);
4494 }
5b155ef9
MM		 4495}
4496
3f7a56c4
MM		 4497void l2cap_move_start(struct l2cap_chan *chan)
4498{
4499 BT_DBG("chan %p", chan);
4500
4501 if (chan->local_amp_id == HCI_BREDR_ID) {
4502 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4503 return;
4504 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4505 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4506 /* Placeholder - start physical link setup */
4507 } else {
4508 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4509 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4510 chan->move_id = 0;
4511 l2cap_move_setup(chan);
4512 l2cap_send_move_chan_req(chan, 0);
4513 }
4514}
4515
8eb200bd
MM		 4516static void l2cap_do_create(struct l2cap_chan *chan, int result,
4517 u8 local_amp_id, u8 remote_amp_id)
4518{
62748ca1
AE		 4519 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4520 local_amp_id, remote_amp_id);
4521
12d6cc60
AE		 4522 chan->fcs = L2CAP_FCS_NONE;
4523
62748ca1
AE		 4524 /* Outgoing channel on AMP */
4525 if (chan->state == BT_CONNECT) {
4526 if (result == L2CAP_CR_SUCCESS) {
4527 chan->local_amp_id = local_amp_id;
4528 l2cap_send_create_chan_req(chan, remote_amp_id);
4529 } else {
4530 /* Revert to BR/EDR connect */
4531 l2cap_send_conn_req(chan);
4532 }
4533
4534 return;
4535 }
4536
4537 /* Incoming channel on AMP */
4538 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4539 struct l2cap_conn_rsp rsp;
4540 char buf[128];
4541 rsp.scid = cpu_to_le16(chan->dcid);
4542 rsp.dcid = cpu_to_le16(chan->scid);
4543
8eb200bd
MM		 4544 if (result == L2CAP_CR_SUCCESS) {
4545 /* Send successful response */
62cd50e2
AE		 4546 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4547 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4548 } else {
4549 /* Send negative response */
62cd50e2
AE		 4550 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4551 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4552 }
4553
4554 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4555 sizeof(rsp), &rsp);
4556
4557 if (result == L2CAP_CR_SUCCESS) {
4558 __l2cap_state_change(chan, BT_CONFIG);
4559 set_bit(CONF_REQ_SENT, &chan->conf_state);
4560 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4561 L2CAP_CONF_REQ,
4562 l2cap_build_conf_req(chan, buf), buf);
4563 chan->num_conf_req++;
4564 }
8eb200bd
MM		 4565 }
4566}
4567
4568static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4569 u8 remote_amp_id)
4570{
4571 l2cap_move_setup(chan);
4572 chan->move_id = local_amp_id;
4573 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4574
4575 l2cap_send_move_chan_req(chan, remote_amp_id);
4576}
4577
4578static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4579{
4580 struct hci_chan *hchan = NULL;
4581
4582 /* Placeholder - get hci_chan for logical link */
4583
4584 if (hchan) {
4585 if (hchan->state == BT_CONNECTED) {
4586 /* Logical link is ready to go */
4587 chan->hs_hcon = hchan->conn;
4588 chan->hs_hcon->l2cap_data = chan->conn;
4589 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4590 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4591
4592 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4593 } else {
4594 /* Wait for logical link to be ready */
4595 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4596 }
4597 } else {
4598 /* Logical link not available */
4599 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4600 }
4601}
4602
4603static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4604{
4605 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4606 u8 rsp_result;
4607 if (result == -EINVAL)
4608 rsp_result = L2CAP_MR_BAD_ID;
4609 else
4610 rsp_result = L2CAP_MR_NOT_ALLOWED;
4611
4612 l2cap_send_move_chan_rsp(chan, rsp_result);
4613 }
4614
4615 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4616 chan->move_state = L2CAP_MOVE_STABLE;
4617
4618 /* Restart data transmission */
4619 l2cap_ertm_send(chan);
4620}
4621
a514b17f
AE		 4622/* Invoke with locked chan */
4623void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4624{
770bfefa 4625 u8 local_amp_id = chan->local_amp_id;
fffadc08 4626 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4627
8eb200bd
MM		 4628 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4629 chan, result, local_amp_id, remote_amp_id);
4630
8eb200bd
MM		 4631 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4632 l2cap_chan_unlock(chan);
4633 return;
4634 }
4635
4636 if (chan->state != BT_CONNECTED) {
4637 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4638 } else if (result != L2CAP_MR_SUCCESS) {
4639 l2cap_do_move_cancel(chan, result);
4640 } else {
4641 switch (chan->move_role) {
4642 case L2CAP_MOVE_ROLE_INITIATOR:
4643 l2cap_do_move_initiate(chan, local_amp_id,
4644 remote_amp_id);
4645 break;
4646 case L2CAP_MOVE_ROLE_RESPONDER:
4647 l2cap_do_move_respond(chan, result);
4648 break;
4649 default:
4650 l2cap_do_move_cancel(chan, result);
4651 break;
4652 }
4653 }
8eb200bd
MM		 4654}
4655
8d5a04a1 4656static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4657 struct l2cap_cmd_hdr *cmd,
4658 u16 cmd_len, void *data)
8d5a04a1
MM		 4659{
4660 struct l2cap_move_chan_req *req = data;
1500109b 4661 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4662 struct l2cap_chan *chan;
8d5a04a1
MM		 4663 u16 icid = 0;
4664 u16 result = L2CAP_MR_NOT_ALLOWED;
4665
4666 if (cmd_len != sizeof(*req))
4667 return -EPROTO;
4668
4669 icid = le16_to_cpu(req->icid);
4670
ad0ac6ca 4671 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1
MM		 4672
4673 if (!enable_hs)
4674 return -EINVAL;
4675
02b0fbb9
MM		 4676 chan = l2cap_get_chan_by_dcid(conn, icid);
4677 if (!chan) {
1500109b
MM		 4678 rsp.icid = cpu_to_le16(icid);
4679 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4680 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4681 sizeof(rsp), &rsp);
02b0fbb9
MM		 4682 return 0;
4683 }
4684
1500109b
MM		 4685 chan->ident = cmd->ident;
4686
02b0fbb9
MM		 4687 if (chan->scid < L2CAP_CID_DYN_START ||
4688 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4689 (chan->mode != L2CAP_MODE_ERTM &&
4690 chan->mode != L2CAP_MODE_STREAMING)) {
4691 result = L2CAP_MR_NOT_ALLOWED;
4692 goto send_move_response;
4693 }
4694
4695 if (chan->local_amp_id == req->dest_amp_id) {
4696 result = L2CAP_MR_SAME_ID;
4697 goto send_move_response;
4698 }
4699
4700 if (req->dest_amp_id) {
4701 struct hci_dev *hdev;
4702 hdev = hci_dev_get(req->dest_amp_id);
4703 if (!hdev || hdev->dev_type != HCI_AMP ||
4704 !test_bit(HCI_UP, &hdev->flags)) {
4705 if (hdev)
4706 hci_dev_put(hdev);
4707
4708 result = L2CAP_MR_BAD_ID;
4709 goto send_move_response;
4710 }
4711 hci_dev_put(hdev);
4712 }
4713
4714 /* Detect a move collision. Only send a collision response
4715 * if this side has "lost", otherwise proceed with the move.
4716 * The winner has the larger bd_addr.
4717 */
4718 if ((__chan_is_moving(chan) ||
4719 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4720 bacmp(conn->src, conn->dst) > 0) {
4721 result = L2CAP_MR_COLLISION;
4722 goto send_move_response;
4723 }
4724
02b0fbb9
MM		 4725 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4726 l2cap_move_setup(chan);
4727 chan->move_id = req->dest_amp_id;
4728 icid = chan->dcid;
4729
4730 if (!req->dest_amp_id) {
4731 /* Moving to BR/EDR */
4732 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4733 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4734 result = L2CAP_MR_PEND;
4735 } else {
4736 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4737 result = L2CAP_MR_SUCCESS;
4738 }
4739 } else {
4740 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4741 /* Placeholder - uncomment when amp functions are available */
4742 /*amp_accept_physical(chan, req->dest_amp_id);*/
4743 result = L2CAP_MR_PEND;
4744 }
4745
4746send_move_response:
1500109b 4747 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4748
02b0fbb9
MM		 4749 l2cap_chan_unlock(chan);
4750
8d5a04a1
MM		 4751 return 0;
4752}
4753
5b155ef9
MM		 4754static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4755{
4756 struct l2cap_chan *chan;
4757 struct hci_chan *hchan = NULL;
4758
4759 chan = l2cap_get_chan_by_scid(conn, icid);
4760 if (!chan) {
4761 l2cap_send_move_chan_cfm_icid(conn, icid);
4762 return;
4763 }
4764
4765 __clear_chan_timer(chan);
4766 if (result == L2CAP_MR_PEND)
4767 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4768
4769 switch (chan->move_state) {
4770 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4771 /* Move confirm will be sent when logical link
4772 * is complete.
4773 */
4774 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4775 break;
4776 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4777 if (result == L2CAP_MR_PEND) {
4778 break;
4779 } else if (test_bit(CONN_LOCAL_BUSY,
4780 &chan->conn_state)) {
4781 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4782 } else {
4783 /* Logical link is up or moving to BR/EDR,
4784 * proceed with move
4785 */
4786 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4787 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4788 }
4789 break;
4790 case L2CAP_MOVE_WAIT_RSP:
4791 /* Moving to AMP */
4792 if (result == L2CAP_MR_SUCCESS) {
4793 /* Remote is ready, send confirm immediately
4794 * after logical link is ready
4795 */
4796 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4797 } else {
4798 /* Both logical link and move success
4799 * are required to confirm
4800 */
4801 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4802 }
4803
4804 /* Placeholder - get hci_chan for logical link */
4805 if (!hchan) {
4806 /* Logical link not available */
4807 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4808 break;
4809 }
4810
4811 /* If the logical link is not yet connected, do not
4812 * send confirmation.
4813 */
4814 if (hchan->state != BT_CONNECTED)
4815 break;
4816
4817 /* Logical link is already ready to go */
4818
4819 chan->hs_hcon = hchan->conn;
4820 chan->hs_hcon->l2cap_data = chan->conn;
4821
4822 if (result == L2CAP_MR_SUCCESS) {
4823 /* Can confirm now */
4824 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4825 } else {
4826 /* Now only need move success
4827 * to confirm
4828 */
4829 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4830 }
4831
4832 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4833 break;
4834 default:
4835 /* Any other amp move state means the move failed. */
4836 chan->move_id = chan->local_amp_id;
4837 l2cap_move_done(chan);
4838 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4839 }
4840
4841 l2cap_chan_unlock(chan);
4842}
4843
4844static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
4845 u16 result)
4846{
4847 struct l2cap_chan *chan;
4848
4849 chan = l2cap_get_chan_by_ident(conn, ident);
4850 if (!chan) {
4851 /* Could not locate channel, icid is best guess */
4852 l2cap_send_move_chan_cfm_icid(conn, icid);
4853 return;
4854 }
4855
4856 __clear_chan_timer(chan);
4857
4858 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4859 if (result == L2CAP_MR_COLLISION) {
4860 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4861 } else {
4862 /* Cleanup - cancel move */
4863 chan->move_id = chan->local_amp_id;
4864 l2cap_move_done(chan);
4865 }
4866 }
4867
4868 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4869
4870 l2cap_chan_unlock(chan);
4871}
4872
4873static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
4874 struct l2cap_cmd_hdr *cmd,
4875 u16 cmd_len, void *data)
8d5a04a1
MM		 4876{
4877 struct l2cap_move_chan_rsp *rsp = data;
4878 u16 icid, result;
4879
4880 if (cmd_len != sizeof(*rsp))
4881 return -EPROTO;
4882
4883 icid = le16_to_cpu(rsp->icid);
4884 result = le16_to_cpu(rsp->result);
4885
ad0ac6ca 4886 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 4887
5b155ef9
MM		 4888 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
4889 l2cap_move_continue(conn, icid, result);
4890 else
4891 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 4892
4893 return 0;
4894}
4895
5f3847a4
MM		 4896static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
4897 struct l2cap_cmd_hdr *cmd,
4898 u16 cmd_len, void *data)
8d5a04a1
MM		 4899{
4900 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 4901 struct l2cap_chan *chan;
8d5a04a1
MM		 4902 u16 icid, result;
4903
4904 if (cmd_len != sizeof(*cfm))
4905 return -EPROTO;
4906
4907 icid = le16_to_cpu(cfm->icid);
4908 result = le16_to_cpu(cfm->result);
4909
ad0ac6ca 4910 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 4911
5f3847a4
MM		 4912 chan = l2cap_get_chan_by_dcid(conn, icid);
4913 if (!chan) {
4914 /* Spec requires a response even if the icid was not found */
4915 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4916 return 0;
4917 }
4918
4919 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
4920 if (result == L2CAP_MC_CONFIRMED) {
4921 chan->local_amp_id = chan->move_id;
4922 if (!chan->local_amp_id)
4923 __release_logical_link(chan);
4924 } else {
4925 chan->move_id = chan->local_amp_id;
4926 }
4927
4928 l2cap_move_done(chan);
4929 }
4930
8d5a04a1
MM		 4931 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4932
5f3847a4
MM		 4933 l2cap_chan_unlock(chan);
4934
8d5a04a1
MM		 4935 return 0;
4936}
4937
4938static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 4939 struct l2cap_cmd_hdr *cmd,
4940 u16 cmd_len, void *data)
8d5a04a1
MM		 4941{
4942 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 4943 struct l2cap_chan *chan;
8d5a04a1
MM		 4944 u16 icid;
4945
4946 if (cmd_len != sizeof(*rsp))
4947 return -EPROTO;
4948
4949 icid = le16_to_cpu(rsp->icid);
4950
ad0ac6ca 4951 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 4952
3fd71a0a
MM		 4953 chan = l2cap_get_chan_by_scid(conn, icid);
4954 if (!chan)
4955 return 0;
4956
4957 __clear_chan_timer(chan);
4958
4959 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
4960 chan->local_amp_id = chan->move_id;
4961
4962 if (!chan->local_amp_id && chan->hs_hchan)
4963 __release_logical_link(chan);
4964
4965 l2cap_move_done(chan);
4966 }
4967
4968 l2cap_chan_unlock(chan);
4969
8d5a04a1
MM		 4970 return 0;
4971}
4972
e2174ca4 4973static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 4974 u16 to_multiplier)
de73115a
CT		 4975{
4976 u16 max_latency;
4977
4978 if (min > max || min < 6 || max > 3200)
4979 return -EINVAL;
4980
4981 if (to_multiplier < 10 || to_multiplier > 3200)
4982 return -EINVAL;
4983
4984 if (max >= to_multiplier * 8)
4985 return -EINVAL;
4986
4987 max_latency = (to_multiplier * 8 / max) - 1;
4988 if (latency > 499 || latency > max_latency)
4989 return -EINVAL;
4990
4991 return 0;
4992}
4993
4994static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818
GP		 4995 struct l2cap_cmd_hdr *cmd,
4996 u8 *data)
de73115a
CT		 4997{
4998 struct hci_conn *hcon = conn->hcon;
4999 struct l2cap_conn_param_update_req *req;
5000 struct l2cap_conn_param_update_rsp rsp;
5001 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 5002 int err;
de73115a
CT		 5003
5004 if (!(hcon->link_mode & HCI_LM_MASTER))
5005 return -EINVAL;
5006
5007 cmd_len = __le16_to_cpu(cmd->len);
5008 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5009 return -EPROTO;
5010
5011 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5012 min = __le16_to_cpu(req->min);
5013 max = __le16_to_cpu(req->max);
de73115a
CT		 5014 latency = __le16_to_cpu(req->latency);
5015 to_multiplier = __le16_to_cpu(req->to_multiplier);
5016
5017 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5018 min, max, latency, to_multiplier);
de73115a
CT		 5019
5020 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5021
5022 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5023 if (err)
ac73498c 5024 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5025 else
ac73498c 5026 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5027
5028 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5029 sizeof(rsp), &rsp);
de73115a 5030
2ce603eb
CT		 5031 if (!err)
5032 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5033
de73115a
CT		 5034 return 0;
5035}
5036
3300d9a9 5037static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5038 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5039 u8 *data)
3300d9a9
CT		 5040{
5041 int err = 0;
5042
5043 switch (cmd->code) {
5044 case L2CAP_COMMAND_REJ:
5045 l2cap_command_rej(conn, cmd, data);
5046 break;
5047
5048 case L2CAP_CONN_REQ:
5049 err = l2cap_connect_req(conn, cmd, data);
5050 break;
5051
5052 case L2CAP_CONN_RSP:
f5a2598d 5053 case L2CAP_CREATE_CHAN_RSP:
5909cf30 5054 err = l2cap_connect_create_rsp(conn, cmd, data);
3300d9a9
CT		 5055 break;
5056
5057 case L2CAP_CONF_REQ:
5058 err = l2cap_config_req(conn, cmd, cmd_len, data);
5059 break;
5060
5061 case L2CAP_CONF_RSP:
5062 err = l2cap_config_rsp(conn, cmd, data);
5063 break;
5064
5065 case L2CAP_DISCONN_REQ:
5066 err = l2cap_disconnect_req(conn, cmd, data);
5067 break;
5068
5069 case L2CAP_DISCONN_RSP:
5070 err = l2cap_disconnect_rsp(conn, cmd, data);
5071 break;
5072
5073 case L2CAP_ECHO_REQ:
5074 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5075 break;
5076
5077 case L2CAP_ECHO_RSP:
5078 break;
5079
5080 case L2CAP_INFO_REQ:
5081 err = l2cap_information_req(conn, cmd, data);
5082 break;
5083
5084 case L2CAP_INFO_RSP:
5085 err = l2cap_information_rsp(conn, cmd, data);
5086 break;
5087
f94ff6ff
MM		 5088 case L2CAP_CREATE_CHAN_REQ:
5089 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5090 break;
5091
8d5a04a1
MM		 5092 case L2CAP_MOVE_CHAN_REQ:
5093 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5094 break;
5095
5096 case L2CAP_MOVE_CHAN_RSP:
5097 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5098 break;
5099
5100 case L2CAP_MOVE_CHAN_CFM:
5101 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5102 break;
5103
5104 case L2CAP_MOVE_CHAN_CFM_RSP:
5105 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5106 break;
5107
3300d9a9
CT		 5108 default:
5109 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5110 err = -EINVAL;
5111 break;
5112 }
5113
5114 return err;
5115}
5116
5117static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2d792818 5118 struct l2cap_cmd_hdr *cmd, u8 *data)
3300d9a9
CT		 5119{
5120 switch (cmd->code) {
5121 case L2CAP_COMMAND_REJ:
5122 return 0;
5123
5124 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 5125 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 5126
5127 case L2CAP_CONN_PARAM_UPDATE_RSP:
5128 return 0;
5129
5130 default:
5131 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5132 return -EINVAL;
5133 }
5134}
5135
5136static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5137 struct sk_buff *skb)
1da177e4
LT		 5138{
5139 u8 *data = skb->data;
5140 int len = skb->len;
5141 struct l2cap_cmd_hdr cmd;
3300d9a9 5142 int err;
1da177e4
LT		 5143
5144 l2cap_raw_recv(conn, skb);
5145
5146 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5147 u16 cmd_len;
1da177e4
LT		 5148 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5149 data += L2CAP_CMD_HDR_SIZE;
5150 len -= L2CAP_CMD_HDR_SIZE;
5151
88219a0f 5152 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5153
2d792818
GP		 5154 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5155 cmd.ident);
1da177e4 5156
88219a0f 5157 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5158 BT_DBG("corrupted command");
5159 break;
5160 }
5161
3300d9a9
CT		 5162 if (conn->hcon->type == LE_LINK)
5163 err = l2cap_le_sig_cmd(conn, &cmd, data);
5164 else
5165 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 5166
5167 if (err) {
e2fd318e 5168 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5169
5170 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 5171
5172 /* FIXME: Map err to a valid reason */
ac73498c 5173 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5174 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5175 sizeof(rej), &rej);
1da177e4
LT		 5176 }
5177
88219a0f
AV		 5178 data += cmd_len;
5179 len -= cmd_len;
1da177e4
LT		 5180 }
5181
5182 kfree_skb(skb);
5183}
5184
47d1ec61 5185static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5186{
5187 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5188 int hdr_size;
5189
5190 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5191 hdr_size = L2CAP_EXT_HDR_SIZE;
5192 else
5193 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5194
47d1ec61 5195 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5196 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5197 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5198 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5199
5200 if (our_fcs != rcv_fcs)
7a560e5c 5201 return -EBADMSG;
fcc203c3
GP		 5202 }
5203 return 0;
5204}
5205
6ea00485 5206static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5207{
e31f7633 5208 struct l2cap_ctrl control;
d5392c8f 5209
e31f7633 5210 BT_DBG("chan %p", chan);
d5392c8f 5211
e31f7633
MM		 5212 memset(&control, 0, sizeof(control));
5213 control.sframe = 1;
5214 control.final = 1;
5215 control.reqseq = chan->buffer_seq;
5216 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5217
e2ab4353 5218 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5219 control.super = L2CAP_SUPER_RNR;
5220 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5221 }
5222
e31f7633
MM		 5223 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5224 chan->unacked_frames > 0)
5225 __set_retrans_timer(chan);
d5392c8f 5226
e31f7633 5227 /* Send pending iframes */
525cd185 5228 l2cap_ertm_send(chan);
d5392c8f 5229
e2ab4353 5230 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5231 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5232 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5233 * send it now.
5234 */
5235 control.super = L2CAP_SUPER_RR;
5236 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5237 }
5238}
5239
2d792818
GP		 5240static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5241 struct sk_buff **last_frag)
18778a63 5242{
84084a31
MM		 5243 /* skb->len reflects data in skb as well as all fragments
5244 * skb->data_len reflects only data in fragments
5245 */
5246 if (!skb_has_frag_list(skb))
5247 skb_shinfo(skb)->frag_list = new_frag;
5248
5249 new_frag->next = NULL;
5250
5251 (*last_frag)->next = new_frag;
5252 *last_frag = new_frag;
5253
5254 skb->len += new_frag->len;
5255 skb->data_len += new_frag->len;
5256 skb->truesize += new_frag->truesize;
5257}
5258
4b51dae9
MM		 5259static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5260 struct l2cap_ctrl *control)
84084a31
MM		 5261{
5262 int err = -EINVAL;
18778a63 5263
4b51dae9 5264 switch (control->sar) {
7e0ef6ee 5265 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5266 if (chan->sdu)
5267 break;
18778a63 5268
80b98027 5269 err = chan->ops->recv(chan, skb);
84084a31 5270 break;
18778a63 5271
7e0ef6ee 5272 case L2CAP_SAR_START:
84084a31
MM		 5273 if (chan->sdu)
5274 break;
18778a63 5275
6f61fd47 5276 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5277 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5278
84084a31
MM		 5279 if (chan->sdu_len > chan->imtu) {
5280 err = -EMSGSIZE;
5281 break;
5282 }
1890d36b 5283
84084a31
MM		 5284 if (skb->len >= chan->sdu_len)
5285 break;
18778a63 5286
84084a31
MM		 5287 chan->sdu = skb;
5288 chan->sdu_last_frag = skb;
18778a63 5289
84084a31
MM		 5290 skb = NULL;
5291 err = 0;
18778a63
GP		 5292 break;
5293
7e0ef6ee 5294 case L2CAP_SAR_CONTINUE:
6f61fd47 5295 if (!chan->sdu)
84084a31 5296 break;
18778a63 5297
84084a31
MM		 5298 append_skb_frag(chan->sdu, skb,
5299 &chan->sdu_last_frag);
5300 skb = NULL;
18778a63 5301
84084a31
MM		 5302 if (chan->sdu->len >= chan->sdu_len)
5303 break;
4178ba46 5304
84084a31 5305 err = 0;
18778a63
GP		 5306 break;
5307
7e0ef6ee 5308 case L2CAP_SAR_END:
6f61fd47 5309 if (!chan->sdu)
84084a31 5310 break;
18778a63 5311
84084a31
MM		 5312 append_skb_frag(chan->sdu, skb,
5313 &chan->sdu_last_frag);
5314 skb = NULL;
4178ba46 5315
84084a31
MM		 5316 if (chan->sdu->len != chan->sdu_len)
5317 break;
18778a63 5318
80b98027 5319 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5320
84084a31
MM		 5321 if (!err) {
5322 /* Reassembly complete */
5323 chan->sdu = NULL;
5324 chan->sdu_last_frag = NULL;
5325 chan->sdu_len = 0;
1890d36b 5326 }
18778a63
GP		 5327 break;
5328 }
5329
84084a31
MM		 5330 if (err) {
5331 kfree_skb(skb);
5332 kfree_skb(chan->sdu);
5333 chan->sdu = NULL;
5334 chan->sdu_last_frag = NULL;
5335 chan->sdu_len = 0;
5336 }
18778a63 5337
84084a31 5338 return err;
18778a63
GP		 5339}
5340
32b32735
MM		 5341static int l2cap_resegment(struct l2cap_chan *chan)
5342{
5343 /* Placeholder */
5344 return 0;
5345}
5346
61aa4f5b 5347void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5348{
61aa4f5b 5349 u8 event;
712132eb 5350
61aa4f5b
MM		 5351 if (chan->mode != L2CAP_MODE_ERTM)
5352 return;
712132eb 5353
61aa4f5b 5354 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5355 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5356}
5357
d2a7ac5d
MM		 5358static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5359{
63838725
MM		 5360 int err = 0;
5361 /* Pass sequential frames to l2cap_reassemble_sdu()
5362 * until a gap is encountered.
5363 */
5364
5365 BT_DBG("chan %p", chan);
5366
5367 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5368 struct sk_buff *skb;
5369 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5370 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5371
5372 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5373
5374 if (!skb)
5375 break;
5376
5377 skb_unlink(skb, &chan->srej_q);
5378 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5379 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5380 if (err)
5381 break;
5382 }
5383
5384 if (skb_queue_empty(&chan->srej_q)) {
5385 chan->rx_state = L2CAP_RX_STATE_RECV;
5386 l2cap_send_ack(chan);
5387 }
5388
5389 return err;
d2a7ac5d
MM		 5390}
5391
5392static void l2cap_handle_srej(struct l2cap_chan *chan,
5393 struct l2cap_ctrl *control)
5394{
f80842a8
MM		 5395 struct sk_buff *skb;
5396
5397 BT_DBG("chan %p, control %p", chan, control);
5398
5399 if (control->reqseq == chan->next_tx_seq) {
5400 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5401 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5402 return;
5403 }
5404
5405 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5406
5407 if (skb == NULL) {
5408 BT_DBG("Seq %d not available for retransmission",
5409 control->reqseq);
5410 return;
5411 }
5412
5413 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5414 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5415 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5416 return;
5417 }
5418
5419 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5420
5421 if (control->poll) {
5422 l2cap_pass_to_tx(chan, control);
5423
5424 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5425 l2cap_retransmit(chan, control);
5426 l2cap_ertm_send(chan);
5427
5428 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5429 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5430 chan->srej_save_reqseq = control->reqseq;
5431 }
5432 } else {
5433 l2cap_pass_to_tx_fbit(chan, control);
5434
5435 if (control->final) {
5436 if (chan->srej_save_reqseq != control->reqseq ||
5437 !test_and_clear_bit(CONN_SREJ_ACT,
5438 &chan->conn_state))
5439 l2cap_retransmit(chan, control);
5440 } else {
5441 l2cap_retransmit(chan, control);
5442 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5443 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5444 chan->srej_save_reqseq = control->reqseq;
5445 }
5446 }
5447 }
d2a7ac5d
MM		 5448}
5449
5450static void l2cap_handle_rej(struct l2cap_chan *chan,
5451 struct l2cap_ctrl *control)
5452{
fcd289df
MM		 5453 struct sk_buff *skb;
5454
5455 BT_DBG("chan %p, control %p", chan, control);
5456
5457 if (control->reqseq == chan->next_tx_seq) {
5458 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5459 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5460 return;
5461 }
5462
5463 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5464
5465 if (chan->max_tx && skb &&
5466 bt_cb(skb)->control.retries >= chan->max_tx) {
5467 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5468 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5469 return;
5470 }
5471
5472 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5473
5474 l2cap_pass_to_tx(chan, control);
5475
5476 if (control->final) {
5477 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5478 l2cap_retransmit_all(chan, control);
5479 } else {
5480 l2cap_retransmit_all(chan, control);
5481 l2cap_ertm_send(chan);
5482 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5483 set_bit(CONN_REJ_ACT, &chan->conn_state);
5484 }
d2a7ac5d
MM		 5485}
5486
4b51dae9
MM		 5487static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5488{
5489 BT_DBG("chan %p, txseq %d", chan, txseq);
5490
5491 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5492 chan->expected_tx_seq);
5493
5494 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5495 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5496 chan->tx_win) {
4b51dae9
MM		 5497 /* See notes below regarding "double poll" and
5498 * invalid packets.
5499 */
5500 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5501 BT_DBG("Invalid/Ignore - after SREJ");
5502 return L2CAP_TXSEQ_INVALID_IGNORE;
5503 } else {
5504 BT_DBG("Invalid - in window after SREJ sent");
5505 return L2CAP_TXSEQ_INVALID;
5506 }
5507 }
5508
5509 if (chan->srej_list.head == txseq) {
5510 BT_DBG("Expected SREJ");
5511 return L2CAP_TXSEQ_EXPECTED_SREJ;
5512 }
5513
5514 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5515 BT_DBG("Duplicate SREJ - txseq already stored");
5516 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5517 }
5518
5519 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5520 BT_DBG("Unexpected SREJ - not requested");
5521 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5522 }
5523 }
5524
5525 if (chan->expected_tx_seq == txseq) {
5526 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5527 chan->tx_win) {
5528 BT_DBG("Invalid - txseq outside tx window");
5529 return L2CAP_TXSEQ_INVALID;
5530 } else {
5531 BT_DBG("Expected");
5532 return L2CAP_TXSEQ_EXPECTED;
5533 }
5534 }
5535
5536 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 5537 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 5538 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5539 return L2CAP_TXSEQ_DUPLICATE;
5540 }
5541
5542 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5543 /* A source of invalid packets is a "double poll" condition,
5544 * where delays cause us to send multiple poll packets. If
5545 * the remote stack receives and processes both polls,
5546 * sequence numbers can wrap around in such a way that a
5547 * resent frame has a sequence number that looks like new data
5548 * with a sequence gap. This would trigger an erroneous SREJ
5549 * request.
5550 *
5551 * Fortunately, this is impossible with a tx window that's
5552 * less than half of the maximum sequence number, which allows
5553 * invalid frames to be safely ignored.
5554 *
5555 * With tx window sizes greater than half of the tx window
5556 * maximum, the frame is invalid and cannot be ignored. This
5557 * causes a disconnect.
5558 */
5559
5560 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5561 BT_DBG("Invalid/Ignore - txseq outside tx window");
5562 return L2CAP_TXSEQ_INVALID_IGNORE;
5563 } else {
5564 BT_DBG("Invalid - txseq outside tx window");
5565 return L2CAP_TXSEQ_INVALID;
5566 }
5567 } else {
5568 BT_DBG("Unexpected - txseq indicates missing frames");
5569 return L2CAP_TXSEQ_UNEXPECTED;
5570 }
5571}
5572
d2a7ac5d
MM		 5573static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5574 struct l2cap_ctrl *control,
5575 struct sk_buff *skb, u8 event)
5576{
5577 int err = 0;
5578 bool skb_in_use = 0;
5579
5580 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5581 event);
5582
5583 switch (event) {
5584 case L2CAP_EV_RECV_IFRAME:
5585 switch (l2cap_classify_txseq(chan, control->txseq)) {
5586 case L2CAP_TXSEQ_EXPECTED:
5587 l2cap_pass_to_tx(chan, control);
5588
5589 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5590 BT_DBG("Busy, discarding expected seq %d",
5591 control->txseq);
5592 break;
5593 }
5594
5595 chan->expected_tx_seq = __next_seq(chan,
5596 control->txseq);
5597
5598 chan->buffer_seq = chan->expected_tx_seq;
5599 skb_in_use = 1;
5600
5601 err = l2cap_reassemble_sdu(chan, skb, control);
5602 if (err)
5603 break;
5604
5605 if (control->final) {
5606 if (!test_and_clear_bit(CONN_REJ_ACT,
5607 &chan->conn_state)) {
5608 control->final = 0;
5609 l2cap_retransmit_all(chan, control);
5610 l2cap_ertm_send(chan);
5611 }
5612 }
5613
5614 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5615 l2cap_send_ack(chan);
5616 break;
5617 case L2CAP_TXSEQ_UNEXPECTED:
5618 l2cap_pass_to_tx(chan, control);
5619
5620 /* Can't issue SREJ frames in the local busy state.
5621 * Drop this frame, it will be seen as missing
5622 * when local busy is exited.
5623 */
5624 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5625 BT_DBG("Busy, discarding unexpected seq %d",
5626 control->txseq);
5627 break;
5628 }
5629
5630 /* There was a gap in the sequence, so an SREJ
5631 * must be sent for each missing frame. The
5632 * current frame is stored for later use.
5633 */
5634 skb_queue_tail(&chan->srej_q, skb);
5635 skb_in_use = 1;
5636 BT_DBG("Queued %p (queue len %d)", skb,
5637 skb_queue_len(&chan->srej_q));
5638
5639 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5640 l2cap_seq_list_clear(&chan->srej_list);
5641 l2cap_send_srej(chan, control->txseq);
5642
5643 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5644 break;
5645 case L2CAP_TXSEQ_DUPLICATE:
5646 l2cap_pass_to_tx(chan, control);
5647 break;
5648 case L2CAP_TXSEQ_INVALID_IGNORE:
5649 break;
5650 case L2CAP_TXSEQ_INVALID:
5651 default:
5e4e3972 5652 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5653 break;
5654 }
5655 break;
5656 case L2CAP_EV_RECV_RR:
5657 l2cap_pass_to_tx(chan, control);
5658 if (control->final) {
5659 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5660
e6a3ee6e
MM		 5661 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5662 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 5663 control->final = 0;
5664 l2cap_retransmit_all(chan, control);
5665 }
5666
5667 l2cap_ertm_send(chan);
5668 } else if (control->poll) {
5669 l2cap_send_i_or_rr_or_rnr(chan);
5670 } else {
5671 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5672 &chan->conn_state) &&
5673 chan->unacked_frames)
5674 __set_retrans_timer(chan);
5675
5676 l2cap_ertm_send(chan);
5677 }
5678 break;
5679 case L2CAP_EV_RECV_RNR:
5680 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5681 l2cap_pass_to_tx(chan, control);
5682 if (control && control->poll) {
5683 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5684 l2cap_send_rr_or_rnr(chan, 0);
5685 }
5686 __clear_retrans_timer(chan);
5687 l2cap_seq_list_clear(&chan->retrans_list);
5688 break;
5689 case L2CAP_EV_RECV_REJ:
5690 l2cap_handle_rej(chan, control);
5691 break;
5692 case L2CAP_EV_RECV_SREJ:
5693 l2cap_handle_srej(chan, control);
5694 break;
5695 default:
5696 break;
5697 }
5698
5699 if (skb && !skb_in_use) {
5700 BT_DBG("Freeing %p", skb);
5701 kfree_skb(skb);
5702 }
5703
5704 return err;
5705}
5706
5707static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5708 struct l2cap_ctrl *control,
5709 struct sk_buff *skb, u8 event)
5710{
5711 int err = 0;
5712 u16 txseq = control->txseq;
5713 bool skb_in_use = 0;
5714
5715 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5716 event);
5717
5718 switch (event) {
5719 case L2CAP_EV_RECV_IFRAME:
5720 switch (l2cap_classify_txseq(chan, txseq)) {
5721 case L2CAP_TXSEQ_EXPECTED:
5722 /* Keep frame for reassembly later */
5723 l2cap_pass_to_tx(chan, control);
5724 skb_queue_tail(&chan->srej_q, skb);
5725 skb_in_use = 1;
5726 BT_DBG("Queued %p (queue len %d)", skb,
5727 skb_queue_len(&chan->srej_q));
5728
5729 chan->expected_tx_seq = __next_seq(chan, txseq);
5730 break;
5731 case L2CAP_TXSEQ_EXPECTED_SREJ:
5732 l2cap_seq_list_pop(&chan->srej_list);
5733
5734 l2cap_pass_to_tx(chan, control);
5735 skb_queue_tail(&chan->srej_q, skb);
5736 skb_in_use = 1;
5737 BT_DBG("Queued %p (queue len %d)", skb,
5738 skb_queue_len(&chan->srej_q));
5739
5740 err = l2cap_rx_queued_iframes(chan);
5741 if (err)
5742 break;
5743
5744 break;
5745 case L2CAP_TXSEQ_UNEXPECTED:
5746 /* Got a frame that can't be reassembled yet.
5747 * Save it for later, and send SREJs to cover
5748 * the missing frames.
5749 */
5750 skb_queue_tail(&chan->srej_q, skb);
5751 skb_in_use = 1;
5752 BT_DBG("Queued %p (queue len %d)", skb,
5753 skb_queue_len(&chan->srej_q));
5754
5755 l2cap_pass_to_tx(chan, control);
5756 l2cap_send_srej(chan, control->txseq);
5757 break;
5758 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5759 /* This frame was requested with an SREJ, but
5760 * some expected retransmitted frames are
5761 * missing. Request retransmission of missing
5762 * SREJ'd frames.
5763 */
5764 skb_queue_tail(&chan->srej_q, skb);
5765 skb_in_use = 1;
5766 BT_DBG("Queued %p (queue len %d)", skb,
5767 skb_queue_len(&chan->srej_q));
5768
5769 l2cap_pass_to_tx(chan, control);
5770 l2cap_send_srej_list(chan, control->txseq);
5771 break;
5772 case L2CAP_TXSEQ_DUPLICATE_SREJ:
5773 /* We've already queued this frame. Drop this copy. */
5774 l2cap_pass_to_tx(chan, control);
5775 break;
5776 case L2CAP_TXSEQ_DUPLICATE:
5777 /* Expecting a later sequence number, so this frame
5778 * was already received. Ignore it completely.
5779 */
5780 break;
5781 case L2CAP_TXSEQ_INVALID_IGNORE:
5782 break;
5783 case L2CAP_TXSEQ_INVALID:
5784 default:
5e4e3972 5785 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5786 break;
5787 }
5788 break;
5789 case L2CAP_EV_RECV_RR:
5790 l2cap_pass_to_tx(chan, control);
5791 if (control->final) {
5792 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5793
5794 if (!test_and_clear_bit(CONN_REJ_ACT,
5795 &chan->conn_state)) {
5796 control->final = 0;
5797 l2cap_retransmit_all(chan, control);
5798 }
5799
5800 l2cap_ertm_send(chan);
5801 } else if (control->poll) {
5802 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5803 &chan->conn_state) &&
5804 chan->unacked_frames) {
5805 __set_retrans_timer(chan);
5806 }
5807
5808 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5809 l2cap_send_srej_tail(chan);
5810 } else {
5811 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5812 &chan->conn_state) &&
5813 chan->unacked_frames)
5814 __set_retrans_timer(chan);
5815
5816 l2cap_send_ack(chan);
5817 }
5818 break;
5819 case L2CAP_EV_RECV_RNR:
5820 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5821 l2cap_pass_to_tx(chan, control);
5822 if (control->poll) {
5823 l2cap_send_srej_tail(chan);
5824 } else {
5825 struct l2cap_ctrl rr_control;
5826 memset(&rr_control, 0, sizeof(rr_control));
5827 rr_control.sframe = 1;
5828 rr_control.super = L2CAP_SUPER_RR;
5829 rr_control.reqseq = chan->buffer_seq;
5830 l2cap_send_sframe(chan, &rr_control);
5831 }
5832
5833 break;
5834 case L2CAP_EV_RECV_REJ:
5835 l2cap_handle_rej(chan, control);
5836 break;
5837 case L2CAP_EV_RECV_SREJ:
5838 l2cap_handle_srej(chan, control);
5839 break;
5840 }
5841
5842 if (skb && !skb_in_use) {
5843 BT_DBG("Freeing %p", skb);
5844 kfree_skb(skb);
5845 }
5846
5847 return err;
5848}
5849
32b32735
MM		 5850static int l2cap_finish_move(struct l2cap_chan *chan)
5851{
5852 BT_DBG("chan %p", chan);
5853
5854 chan->rx_state = L2CAP_RX_STATE_RECV;
5855
5856 if (chan->hs_hcon)
5857 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
5858 else
5859 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
5860
5861 return l2cap_resegment(chan);
5862}
5863
5864static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
5865 struct l2cap_ctrl *control,
5866 struct sk_buff *skb, u8 event)
5867{
5868 int err;
5869
5870 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5871 event);
5872
5873 if (!control->poll)
5874 return -EPROTO;
5875
5876 l2cap_process_reqseq(chan, control->reqseq);
5877
5878 if (!skb_queue_empty(&chan->tx_q))
5879 chan->tx_send_head = skb_peek(&chan->tx_q);
5880 else
5881 chan->tx_send_head = NULL;
5882
5883 /* Rewind next_tx_seq to the point expected
5884 * by the receiver.
5885 */
5886 chan->next_tx_seq = control->reqseq;
5887 chan->unacked_frames = 0;
5888
5889 err = l2cap_finish_move(chan);
5890 if (err)
5891 return err;
5892
5893 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5894 l2cap_send_i_or_rr_or_rnr(chan);
5895
5896 if (event == L2CAP_EV_RECV_IFRAME)
5897 return -EPROTO;
5898
5899 return l2cap_rx_state_recv(chan, control, NULL, event);
5900}
5901
5902static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
5903 struct l2cap_ctrl *control,
5904 struct sk_buff *skb, u8 event)
5905{
5906 int err;
5907
5908 if (!control->final)
5909 return -EPROTO;
5910
5911 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5912
5913 chan->rx_state = L2CAP_RX_STATE_RECV;
5914 l2cap_process_reqseq(chan, control->reqseq);
5915
5916 if (!skb_queue_empty(&chan->tx_q))
5917 chan->tx_send_head = skb_peek(&chan->tx_q);
5918 else
5919 chan->tx_send_head = NULL;
5920
5921 /* Rewind next_tx_seq to the point expected
5922 * by the receiver.
5923 */
5924 chan->next_tx_seq = control->reqseq;
5925 chan->unacked_frames = 0;
5926
5927 if (chan->hs_hcon)
5928 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
5929 else
5930 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
5931
5932 err = l2cap_resegment(chan);
5933
5934 if (!err)
5935 err = l2cap_rx_state_recv(chan, control, skb, event);
5936
5937 return err;
5938}
5939
d2a7ac5d
MM		 5940static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
5941{
5942 /* Make sure reqseq is for a packet that has been sent but not acked */
5943 u16 unacked;
5944
5945 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
5946 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
5947}
5948
cec8ab6e
MM		 5949static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5950 struct sk_buff *skb, u8 event)
218bb9df 5951{
d2a7ac5d
MM		 5952 int err = 0;
5953
5954 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
5955 control, skb, event, chan->rx_state);
5956
5957 if (__valid_reqseq(chan, control->reqseq)) {
5958 switch (chan->rx_state) {
5959 case L2CAP_RX_STATE_RECV:
5960 err = l2cap_rx_state_recv(chan, control, skb, event);
5961 break;
5962 case L2CAP_RX_STATE_SREJ_SENT:
5963 err = l2cap_rx_state_srej_sent(chan, control, skb,
5964 event);
5965 break;
32b32735
MM		 5966 case L2CAP_RX_STATE_WAIT_P:
5967 err = l2cap_rx_state_wait_p(chan, control, skb, event);
5968 break;
5969 case L2CAP_RX_STATE_WAIT_F:
5970 err = l2cap_rx_state_wait_f(chan, control, skb, event);
5971 break;
d2a7ac5d
MM		 5972 default:
5973 /* shut it down */
5974 break;
5975 }
5976 } else {
5977 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
5978 control->reqseq, chan->next_tx_seq,
5979 chan->expected_ack_seq);
5e4e3972 5980 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5981 }
5982
5983 return err;
cec8ab6e
MM		 5984}
5985
5986static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5987 struct sk_buff *skb)
5988{
4b51dae9
MM		 5989 int err = 0;
5990
5991 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
5992 chan->rx_state);
5993
5994 if (l2cap_classify_txseq(chan, control->txseq) ==
5995 L2CAP_TXSEQ_EXPECTED) {
5996 l2cap_pass_to_tx(chan, control);
5997
5998 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
5999 __next_seq(chan, chan->buffer_seq));
6000
6001 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6002
6003 l2cap_reassemble_sdu(chan, skb, control);
6004 } else {
6005 if (chan->sdu) {
6006 kfree_skb(chan->sdu);
6007 chan->sdu = NULL;
6008 }
6009 chan->sdu_last_frag = NULL;
6010 chan->sdu_len = 0;
6011
6012 if (skb) {
6013 BT_DBG("Freeing %p", skb);
6014 kfree_skb(skb);
6015 }
6016 }
6017
6018 chan->last_acked_seq = control->txseq;
6019 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6020
6021 return err;
cec8ab6e
MM		 6022}
6023
6024static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6025{
6026 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6027 u16 len;
6028 u8 event;
218bb9df 6029
b76bbd66
MM		 6030 __unpack_control(chan, skb);
6031
218bb9df
GP		 6032 len = skb->len;
6033
6034 /*
6035 * We can just drop the corrupted I-frame here.
6036 * Receiver will miss it and start proper recovery
cec8ab6e 6037 * procedures and ask for retransmission.
218bb9df 6038 */
47d1ec61 6039 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6040 goto drop;
6041
cec8ab6e 6042 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6043 len -= L2CAP_SDULEN_SIZE;
218bb9df 6044
47d1ec61 6045 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6046 len -= L2CAP_FCS_SIZE;
218bb9df 6047
47d1ec61 6048 if (len > chan->mps) {
5e4e3972 6049 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6050 goto drop;
6051 }
6052
cec8ab6e
MM		 6053 if (!control->sframe) {
6054 int err;
218bb9df 6055
cec8ab6e
MM		 6056 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6057 control->sar, control->reqseq, control->final,
6058 control->txseq);
218bb9df 6059
cec8ab6e
MM		 6060 /* Validate F-bit - F=0 always valid, F=1 only
6061 * valid in TX WAIT_F
6062 */
6063 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6064 goto drop;
cec8ab6e
MM		 6065
6066 if (chan->mode != L2CAP_MODE_STREAMING) {
6067 event = L2CAP_EV_RECV_IFRAME;
6068 err = l2cap_rx(chan, control, skb, event);
6069 } else {
6070 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6071 }
6072
cec8ab6e 6073 if (err)
5e4e3972 6074 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6075 } else {
cec8ab6e
MM		 6076 const u8 rx_func_to_event[4] = {
6077 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6078 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6079 };
6080
6081 /* Only I-frames are expected in streaming mode */
6082 if (chan->mode == L2CAP_MODE_STREAMING)
6083 goto drop;
6084
6085 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6086 control->reqseq, control->final, control->poll,
6087 control->super);
6088
218bb9df 6089 if (len != 0) {
1bb166e6 6090 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6091 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6092 goto drop;
6093 }
6094
cec8ab6e
MM		 6095 /* Validate F and P bits */
6096 if (control->final && (control->poll ||
6097 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6098 goto drop;
6099
6100 event = rx_func_to_event[control->super];
6101 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6102 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6103 }
6104
6105 return 0;
6106
6107drop:
6108 kfree_skb(skb);
6109 return 0;
6110}
6111
13ca56e0
AE		 6112static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6113 struct sk_buff *skb)
1da177e4 6114{
48454079 6115 struct l2cap_chan *chan;
1da177e4 6116
baa7e1fa 6117 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6118 if (!chan) {
97e8e89d
AE		 6119 if (cid == L2CAP_CID_A2MP) {
6120 chan = a2mp_channel_create(conn, skb);
6121 if (!chan) {
6122 kfree_skb(skb);
13ca56e0 6123 return;
97e8e89d
AE		 6124 }
6125
6126 l2cap_chan_lock(chan);
6127 } else {
6128 BT_DBG("unknown cid 0x%4.4x", cid);
6129 /* Drop packet and return */
6130 kfree_skb(skb);
13ca56e0 6131 return;
97e8e89d 6132 }
1da177e4
LT		 6133 }
6134
49208c9c 6135 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6136
89bc500e 6137 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6138 goto drop;
6139
0c1bc5c6 6140 switch (chan->mode) {
1c2acffb
GP		 6141 case L2CAP_MODE_BASIC:
6142 /* If socket recv buffers overflows we drop data here
6143 * which is *bad* because L2CAP has to be reliable.
6144 * But we don't have any other choice. L2CAP doesn't
6145 * provide flow control mechanism. */
1da177e4 6146
0c1bc5c6 6147 if (chan->imtu < skb->len)
1c2acffb 6148 goto drop;
1da177e4 6149
80b98027 6150 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6151 goto done;
6152 break;
6153
6154 case L2CAP_MODE_ERTM:
6840ed07 6155 case L2CAP_MODE_STREAMING:
cec8ab6e 6156 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6157 goto done;
6158
1c2acffb 6159 default:
0c1bc5c6 6160 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6161 break;
6162 }
1da177e4
LT		 6163
6164drop:
6165 kfree_skb(skb);
6166
6167done:
6be36555 6168 l2cap_chan_unlock(chan);
1da177e4
LT		 6169}
6170
84104b24
AE		 6171static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6172 struct sk_buff *skb)
1da177e4 6173{
23691d75 6174 struct l2cap_chan *chan;
1da177e4 6175
c2287681 6176 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 6177 if (!chan)
1da177e4
LT		 6178 goto drop;
6179
5b4cedaa 6180 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6181
89bc500e 6182 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6183 goto drop;
6184
e13e21dc 6185 if (chan->imtu < skb->len)
1da177e4
LT		 6186 goto drop;
6187
80b98027 6188 if (!chan->ops->recv(chan, skb))
84104b24 6189 return;
1da177e4
LT		 6190
6191drop:
6192 kfree_skb(skb);
1da177e4
LT		 6193}
6194
6810fca7
AE		 6195static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid,
6196 struct sk_buff *skb)
9f69bda6 6197{
23691d75 6198 struct l2cap_chan *chan;
9f69bda6 6199
c2287681 6200 chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst);
23691d75 6201 if (!chan)
9f69bda6
GP		 6202 goto drop;
6203
5b4cedaa 6204 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6205
89bc500e 6206 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 6207 goto drop;
6208
e13e21dc 6209 if (chan->imtu < skb->len)
9f69bda6
GP		 6210 goto drop;
6211
80b98027 6212 if (!chan->ops->recv(chan, skb))
6810fca7 6213 return;
9f69bda6
GP		 6214
6215drop:
6216 kfree_skb(skb);
9f69bda6
GP		 6217}
6218
1da177e4
LT		 6219static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6220{
6221 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 6222 u16 cid, len;
6223 __le16 psm;
1da177e4
LT		 6224
6225 skb_pull(skb, L2CAP_HDR_SIZE);
6226 cid = __le16_to_cpu(lh->cid);
6227 len = __le16_to_cpu(lh->len);
6228
1c2acffb
GP		 6229 if (len != skb->len) {
6230 kfree_skb(skb);
6231 return;
6232 }
6233
1da177e4
LT		 6234 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6235
6236 switch (cid) {
3300d9a9 6237 case L2CAP_CID_LE_SIGNALING:
8db4dc46 6238 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6239 l2cap_sig_channel(conn, skb);
6240 break;
6241
8db4dc46 6242 case L2CAP_CID_CONN_LESS:
097db76c 6243 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6244 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6245 l2cap_conless_channel(conn, psm, skb);
6246 break;
6247
9f69bda6
GP		 6248 case L2CAP_CID_LE_DATA:
6249 l2cap_att_channel(conn, cid, skb);
6250 break;
6251
b501d6a1
AB		 6252 case L2CAP_CID_SMP:
6253 if (smp_sig_channel(conn, skb))
6254 l2cap_conn_del(conn->hcon, EACCES);
6255 break;
6256
1da177e4
LT		 6257 default:
6258 l2cap_data_channel(conn, cid, skb);
6259 break;
6260 }
6261}
6262
6263/* ---- L2CAP interface with lower layer (HCI) ---- */
6264
686ebf28 6265int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 6266{
6267 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 6268 struct l2cap_chan *c;
1da177e4 6269
6ed93dc6 6270 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 6271
6272 /* Find listening sockets and check their link_mode */
23691d75
GP		 6273 read_lock(&chan_list_lock);
6274 list_for_each_entry(c, &chan_list, global_l) {
6275 struct sock *sk = c->sk;
4343478f 6276
89bc500e 6277 if (c->state != BT_LISTEN)
1da177e4
LT		 6278 continue;
6279
6280 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 6281 lm1 |= HCI_LM_ACCEPT;
43bd0f32 6282 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 6283 lm1 |= HCI_LM_MASTER;
1da177e4 6284 exact++;
2af6b9d5
MH		 6285 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
6286 lm2 |= HCI_LM_ACCEPT;
43bd0f32 6287 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 6288 lm2 |= HCI_LM_MASTER;
6289 }
1da177e4 6290 }
23691d75 6291 read_unlock(&chan_list_lock);
1da177e4
LT		 6292
6293 return exact ? lm1 : lm2;
6294}
6295
9e664631 6296void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 6297{
0139418c
MH		 6298 struct l2cap_conn *conn;
6299
6ed93dc6 6300 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 6301
1da177e4 6302 if (!status) {
1da177e4
LT		 6303 conn = l2cap_conn_add(hcon, status);
6304 if (conn)
6305 l2cap_conn_ready(conn);
ba6fc317 6306 } else {
e175072f 6307 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 6308 }
1da177e4
LT		 6309}
6310
686ebf28 6311int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 6312{
6313 struct l2cap_conn *conn = hcon->l2cap_data;
6314
6315 BT_DBG("hcon %p", hcon);
6316
686ebf28 6317 if (!conn)
9f5a0d7b 6318 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 6319 return conn->disc_reason;
6320}
6321
9e664631 6322void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 6323{
6324 BT_DBG("hcon %p reason %d", hcon, reason);
6325
e175072f 6326 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 6327}
6328
4343478f 6329static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 6330{
715ec005 6331 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 6332 return;
6333
f62e4323 6334 if (encrypt == 0x00) {
4343478f 6335 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 6336 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 6337 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 6338 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 6339 } else {
4343478f 6340 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 6341 __clear_chan_timer(chan);
f62e4323
MH		 6342 }
6343}
6344
686ebf28 6345int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 6346{
0139418c 6347 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 6348 struct l2cap_chan *chan;
1da177e4 6349
0139418c 6350 if (!conn)
1da177e4 6351 return 0;
0139418c 6352
89d8b407 6353 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 6354
160dc6ac 6355 if (hcon->type == LE_LINK) {
35d4adcc
HG		 6356 if (!status && encrypt)
6357 smp_distribute_keys(conn, 0);
17cd3f37 6358 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 6359 }
6360
3df91ea2 6361 mutex_lock(&conn->chan_lock);
1da177e4 6362
3df91ea2 6363 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 6364 l2cap_chan_lock(chan);
1da177e4 6365
89d8b407
AE		 6366 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6367 state_to_string(chan->state));
f1cb9af5 6368
78eb2f98
AE		 6369 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6370 l2cap_chan_unlock(chan);
6371 continue;
6372 }
6373
f1cb9af5
VCG		 6374 if (chan->scid == L2CAP_CID_LE_DATA) {
6375 if (!status && encrypt) {
6376 chan->sec_level = hcon->sec_level;
cf4cd009 6377 l2cap_chan_ready(chan);
f1cb9af5
VCG		 6378 }
6379
6be36555 6380 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 6381 continue;
6382 }
6383
96eff46e 6384 if (!__l2cap_no_conn_pending(chan)) {
6be36555 6385 l2cap_chan_unlock(chan);
6a8d3010
MH		 6386 continue;
6387 }
6388
89bc500e 6389 if (!status && (chan->state == BT_CONNECTED ||
2d792818 6390 chan->state == BT_CONFIG)) {
a7d7723a
GP		 6391 struct sock *sk = chan->sk;
6392
c5daa683 6393 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
a7d7723a
GP		 6394 sk->sk_state_change(sk);
6395
4343478f 6396 l2cap_check_encryption(chan, encrypt);
6be36555 6397 l2cap_chan_unlock(chan);
9719f8af
MH		 6398 continue;
6399 }
6400
89bc500e 6401 if (chan->state == BT_CONNECT) {
b1235d79 6402 if (!status) {
93c3e8f5 6403 l2cap_start_connection(chan);
b1235d79 6404 } else {
ba13ccd9 6405 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 6406 }
89bc500e 6407 } else if (chan->state == BT_CONNECT2) {
6be36555 6408 struct sock *sk = chan->sk;
b1235d79 6409 struct l2cap_conn_rsp rsp;
df3c3931 6410 __u16 res, stat;
1da177e4 6411
6be36555
AE		 6412 lock_sock(sk);
6413
b1235d79 6414 if (!status) {
c5daa683
GP		 6415 if (test_bit(BT_SK_DEFER_SETUP,
6416 &bt_sk(sk)->flags)) {
df3c3931
JH		 6417 res = L2CAP_CR_PEND;
6418 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 6419 chan->ops->defer(chan);
df3c3931 6420 } else {
0e587be7 6421 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 6422 res = L2CAP_CR_SUCCESS;
6423 stat = L2CAP_CS_NO_INFO;
6424 }
b1235d79 6425 } else {
0e587be7 6426 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 6427 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 6428 res = L2CAP_CR_SEC_BLOCK;
6429 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 6430 }
6431
6be36555
AE		 6432 release_sock(sk);
6433
fe4128e0
GP		 6434 rsp.scid = cpu_to_le16(chan->dcid);
6435 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 6436 rsp.result = cpu_to_le16(res);
6437 rsp.status = cpu_to_le16(stat);
fc7f8a7e 6438 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 6439 sizeof(rsp), &rsp);
2d369359
MM		 6440
6441 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6442 res == L2CAP_CR_SUCCESS) {
6443 char buf[128];
6444 set_bit(CONF_REQ_SENT, &chan->conf_state);
6445 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6446 L2CAP_CONF_REQ,
6447 l2cap_build_conf_req(chan, buf),
6448 buf);
6449 chan->num_conf_req++;
6450 }
b1235d79 6451 }
1da177e4 6452
6be36555 6453 l2cap_chan_unlock(chan);
1da177e4
LT		 6454 }
6455
3df91ea2 6456 mutex_unlock(&conn->chan_lock);
b1235d79 6457
1da177e4
LT		 6458 return 0;
6459}
6460
686ebf28 6461int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 6462{
6463 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 6464 struct l2cap_hdr *hdr;
6465 int len;
1da177e4 6466
1d13a254
AE		 6467 /* For AMP controller do not create l2cap conn */
6468 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6469 goto drop;
1da177e4 6470
5a08ecce
AE		 6471 if (!conn)
6472 conn = l2cap_conn_add(hcon, 0);
6473
6474 if (!conn)
1da177e4
LT		 6475 goto drop;
6476
6477 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6478
d73a0988
AE		 6479 switch (flags) {
6480 case ACL_START:
6481 case ACL_START_NO_FLUSH:
6482 case ACL_COMPLETE:
1da177e4
LT		 6483 if (conn->rx_len) {
6484 BT_ERR("Unexpected start frame (len %d)", skb->len);
6485 kfree_skb(conn->rx_skb);
6486 conn->rx_skb = NULL;
6487 conn->rx_len = 0;
6488 l2cap_conn_unreliable(conn, ECOMM);
6489 }
6490
aae7fe22
AE		 6491 /* Start fragment always begin with Basic L2CAP header */
6492 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 6493 BT_ERR("Frame is too short (len %d)", skb->len);
6494 l2cap_conn_unreliable(conn, ECOMM);
6495 goto drop;
6496 }
6497
6498 hdr = (struct l2cap_hdr *) skb->data;
6499 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6500
6501 if (len == skb->len) {
6502 /* Complete frame received */
6503 l2cap_recv_frame(conn, skb);
6504 return 0;
6505 }
6506
6507 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6508
6509 if (skb->len > len) {
6510 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 6511 skb->len, len);
1da177e4
LT		 6512 l2cap_conn_unreliable(conn, ECOMM);
6513 goto drop;
6514 }
6515
6516 /* Allocate skb for the complete frame (with header) */
8bcde1f2 6517 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 6518 if (!conn->rx_skb)
1da177e4
LT		 6519 goto drop;
6520
d626f62b 6521 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6522 skb->len);
1da177e4 6523 conn->rx_len = len - skb->len;
d73a0988
AE		 6524 break;
6525
6526 case ACL_CONT:
1da177e4
LT		 6527 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6528
6529 if (!conn->rx_len) {
6530 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6531 l2cap_conn_unreliable(conn, ECOMM);
6532 goto drop;
6533 }
6534
6535 if (skb->len > conn->rx_len) {
6536 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 6537 skb->len, conn->rx_len);
1da177e4
LT		 6538 kfree_skb(conn->rx_skb);
6539 conn->rx_skb = NULL;
6540 conn->rx_len = 0;
6541 l2cap_conn_unreliable(conn, ECOMM);
6542 goto drop;
6543 }
6544
d626f62b 6545 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6546 skb->len);
1da177e4
LT		 6547 conn->rx_len -= skb->len;
6548
6549 if (!conn->rx_len) {
6550 /* Complete frame received */
6551 l2cap_recv_frame(conn, conn->rx_skb);
6552 conn->rx_skb = NULL;
6553 }
d73a0988 6554 break;
1da177e4
LT		 6555 }
6556
6557drop:
6558 kfree_skb(skb);
6559 return 0;
6560}
6561
aef7d97c 6562static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 6563{
23691d75 6564 struct l2cap_chan *c;
1da177e4 6565
333055f2 6566 read_lock(&chan_list_lock);
1da177e4 6567
23691d75
GP		 6568 list_for_each_entry(c, &chan_list, global_l) {
6569 struct sock *sk = c->sk;
101545f6 6570
fcb73338
AE		 6571 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
6572 &bt_sk(sk)->src, &bt_sk(sk)->dst,
6573 c->state, __le16_to_cpu(c->psm),
6574 c->scid, c->dcid, c->imtu, c->omtu,
6575 c->sec_level, c->mode);
61e1b4b7 6576 }
1da177e4 6577
333055f2 6578 read_unlock(&chan_list_lock);
1da177e4 6579
aef7d97c 6580 return 0;
1da177e4
LT		 6581}
6582
aef7d97c
MH		 6583static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6584{
6585 return single_open(file, l2cap_debugfs_show, inode->i_private);
6586}
6587
6588static const struct file_operations l2cap_debugfs_fops = {
6589 .open = l2cap_debugfs_open,
6590 .read = seq_read,
6591 .llseek = seq_lseek,
6592 .release = single_release,
6593};
6594
6595static struct dentry *l2cap_debugfs;
1da177e4 6596
64274518 6597int __init l2cap_init(void)
1da177e4
LT		 6598{
6599 int err;
be9d1227 6600
bb58f747 6601 err = l2cap_init_sockets();
1da177e4
LT		 6602 if (err < 0)
6603 return err;
6604
aef7d97c 6605 if (bt_debugfs) {
2d792818
GP		 6606 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6607 NULL, &l2cap_debugfs_fops);
aef7d97c
MH		 6608 if (!l2cap_debugfs)
6609 BT_ERR("Failed to create L2CAP debug file");
6610 }
1da177e4 6611
1da177e4 6612 return 0;
1da177e4
LT		 6613}
6614
64274518 6615void l2cap_exit(void)
1da177e4 6616{
aef7d97c 6617 debugfs_remove(l2cap_debugfs);
bb58f747 6618 l2cap_cleanup_sockets();
1da177e4
LT		 6619}
6620
d1c4a17d
GP		 6621module_param(disable_ertm, bool, 0644);
6622MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)