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Bluetooth: Process receiving FCS_NONE in L2CAP Conf Rsp
[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;
cbabee78
AE		 3434
3435 case L2CAP_CONF_FCS:
3436 if (*result == L2CAP_CONF_PENDING)
3437 if (val == L2CAP_FCS_NONE)
3438 set_bit(CONF_NO_FCS_RECV,
3439 &chan->conf_state);
3440 break;
f2fcfcd6
GP		 3441 }
3442 }
3443
0c1bc5c6 3444 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3445 return -ECONNREFUSED;
3446
0c1bc5c6 3447 chan->mode = rfc.mode;
6c2ea7a8 3448
0e8b207e 3449 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3450 switch (rfc.mode) {
3451 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3452 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3453 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3454 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3455 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3456 chan->ack_win = min_t(u16, chan->ack_win,
3457 rfc.txwin_size);
66af7aaf
AE		 3458
3459 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3460 chan->local_msdu = le16_to_cpu(efs.msdu);
3461 chan->local_sdu_itime =
2d792818 3462 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3463 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3464 chan->local_flush_to =
2d792818 3465 le32_to_cpu(efs.flush_to);
66af7aaf 3466 }
f2fcfcd6 3467 break;
66af7aaf 3468
f2fcfcd6 3469 case L2CAP_MODE_STREAMING:
47d1ec61 3470 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3471 }
3472 }
3473
fe4128e0 3474 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3475 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3476
3477 return ptr - data;
3478}
3479
2d792818
GP		 3480static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3481 u16 result, u16 flags)
1da177e4
LT		 3482{
3483 struct l2cap_conf_rsp *rsp = data;
3484 void *ptr = rsp->data;
1da177e4 3485
fe4128e0 3486 BT_DBG("chan %p", chan);
1da177e4 3487
fe4128e0 3488 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3489 rsp->result = cpu_to_le16(result);
aca3192c 3490 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3491
3492 return ptr - data;
3493}
3494
8c1d787b 3495void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3496{
3497 struct l2cap_conn_rsp rsp;
8c1d787b 3498 struct l2cap_conn *conn = chan->conn;
710f9b0a 3499 u8 buf[128];
439f34ac 3500 u8 rsp_code;
710f9b0a 3501
fe4128e0
GP		 3502 rsp.scid = cpu_to_le16(chan->dcid);
3503 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3504 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3505 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3506
3507 if (chan->hs_hcon)
3508 rsp_code = L2CAP_CREATE_CHAN_RSP;
3509 else
3510 rsp_code = L2CAP_CONN_RSP;
3511
3512 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3513
3514 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3515
c1360a1c 3516 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3517 return;
3518
710f9b0a 3519 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3520 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3521 chan->num_conf_req++;
3522}
3523
47d1ec61 3524static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3525{
7b1c0049
GP		 3526 int type, olen;
3527 unsigned long val;
c20f8e35
MM		 3528 /* Use sane default values in case a misbehaving remote device
3529 * did not send an RFC or extended window size option.
3530 */
3531 u16 txwin_ext = chan->ack_win;
3532 struct l2cap_conf_rfc rfc = {
3533 .mode = chan->mode,
3534 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3535 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3536 .max_pdu_size = cpu_to_le16(chan->imtu),
3537 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3538 };
7b1c0049 3539
47d1ec61 3540 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3541
0c1bc5c6 3542 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3543 return;
3544
3545 while (len >= L2CAP_CONF_OPT_SIZE) {
3546 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3547
c20f8e35
MM		 3548 switch (type) {
3549 case L2CAP_CONF_RFC:
3550 if (olen == sizeof(rfc))
3551 memcpy(&rfc, (void *)val, olen);
8f321f85 3552 break;
c20f8e35
MM		 3553 case L2CAP_CONF_EWS:
3554 txwin_ext = val;
3555 break;
3556 }
7b1c0049
GP		 3557 }
3558
7b1c0049
GP		 3559 switch (rfc.mode) {
3560 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3561 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3562 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3563 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3564 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3565 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3566 else
3567 chan->ack_win = min_t(u16, chan->ack_win,
3568 rfc.txwin_size);
7b1c0049
GP		 3569 break;
3570 case L2CAP_MODE_STREAMING:
47d1ec61 3571 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3572 }
3573}
3574
2d792818
GP		 3575static inline int l2cap_command_rej(struct l2cap_conn *conn,
3576 struct l2cap_cmd_hdr *cmd, u8 *data)
4e8402a3 3577{
e2fd318e 3578 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3579
e2fd318e 3580 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3581 return 0;
3582
3583 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3584 cmd->ident == conn->info_ident) {
17cd3f37 3585 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3586
3587 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3588 conn->info_ident = 0;
984947dc 3589
4e8402a3
MH		 3590 l2cap_conn_start(conn);
3591 }
3592
3593 return 0;
3594}
3595
1700915f
MM		 3596static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3597 struct l2cap_cmd_hdr *cmd,
3598 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3599{
1da177e4
LT		 3600 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3601 struct l2cap_conn_rsp rsp;
23691d75 3602 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3603 struct sock *parent, *sk = NULL;
e7c29cb1 3604 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3605
3606 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3607 __le16 psm = req->psm;
1da177e4 3608
097db76c 3609 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3610
3611 /* Check if we have socket listening on psm */
c2287681 3612 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 3613 if (!pchan) {
1da177e4
LT		 3614 result = L2CAP_CR_BAD_PSM;
3615 goto sendresp;
3616 }
3617
23691d75
GP		 3618 parent = pchan->sk;
3619
3df91ea2 3620 mutex_lock(&conn->chan_lock);
aa2ac881 3621 lock_sock(parent);
e0f0cb56 3622
e7c29cb1 3623 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3624 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3625 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3626 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3627 result = L2CAP_CR_SEC_BLOCK;
3628 goto response;
3629 }
3630
1da177e4
LT		 3631 result = L2CAP_CR_NO_MEM;
3632
2dfa1003
GP		 3633 /* Check if we already have channel with that dcid */
3634 if (__l2cap_get_chan_by_dcid(conn, scid))
3635 goto response;
3636
80b98027 3637 chan = pchan->ops->new_connection(pchan);
80808e43 3638 if (!chan)
1da177e4
LT		 3639 goto response;
3640
80808e43
GP		 3641 sk = chan->sk;
3642
1da177e4
LT		 3643 hci_conn_hold(conn->hcon);
3644
1da177e4
LT		 3645 bacpy(&bt_sk(sk)->src, conn->src);
3646 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3647 chan->psm = psm;
3648 chan->dcid = scid;
1700915f 3649 chan->local_amp_id = amp_id;
1da177e4 3650
6be36555 3651 __l2cap_chan_add(conn, chan);
48454079 3652
fe4128e0 3653 dcid = chan->scid;
1da177e4 3654
c9b66675 3655 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3656
fc7f8a7e 3657 chan->ident = cmd->ident;
1da177e4 3658
984947dc 3659 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3660 if (l2cap_chan_check_security(chan)) {
c5daa683 3661 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
0e587be7 3662 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3663 result = L2CAP_CR_PEND;
3664 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3665 chan->ops->defer(chan);
f66dc81f 3666 } else {
1700915f
MM		 3667 /* Force pending result for AMP controllers.
3668 * The connection will succeed after the
3669 * physical link is up.
3670 */
3671 if (amp_id) {
3672 __l2cap_state_change(chan, BT_CONNECT2);
3673 result = L2CAP_CR_PEND;
3674 } else {
3675 __l2cap_state_change(chan, BT_CONFIG);
3676 result = L2CAP_CR_SUCCESS;
3677 }
f66dc81f
MH		 3678 status = L2CAP_CS_NO_INFO;
3679 }
79d554a6 3680 } else {
0e587be7 3681 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3682 result = L2CAP_CR_PEND;
3683 status = L2CAP_CS_AUTHEN_PEND;
3684 }
3685 } else {
0e587be7 3686 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3687 result = L2CAP_CR_PEND;
3688 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3689 }
3690
1da177e4 3691response:
aa2ac881 3692 release_sock(parent);
3df91ea2 3693 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3694
3695sendresp:
aca3192c
YH		 3696 rsp.scid = cpu_to_le16(scid);
3697 rsp.dcid = cpu_to_le16(dcid);
3698 rsp.result = cpu_to_le16(result);
3699 rsp.status = cpu_to_le16(status);
4c89b6aa 3700 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3701
3702 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3703 struct l2cap_info_req info;
ac73498c 3704 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3705
3706 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3707 conn->info_ident = l2cap_get_ident(conn);
3708
ba13ccd9 3709 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3710
2d792818
GP		 3711 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3712 sizeof(info), &info);
79d554a6
MH		 3713 }
3714
c1360a1c 3715 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3716 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3717 u8 buf[128];
c1360a1c 3718 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3719 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3720 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3721 chan->num_conf_req++;
e9aeb2dd 3722 }
1700915f
MM		 3723
3724 return chan;
4c89b6aa 3725}
e9aeb2dd 3726
4c89b6aa
MM		 3727static int l2cap_connect_req(struct l2cap_conn *conn,
3728 struct l2cap_cmd_hdr *cmd, u8 *data)
3729{
300229f9 3730 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3731 return 0;
3732}
3733
5909cf30 3734static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
2d792818 3735 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 3736{
3737 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3738 u16 scid, dcid, result, status;
48454079 3739 struct l2cap_chan *chan;
1da177e4 3740 u8 req[128];
3df91ea2 3741 int err;
1da177e4
LT		 3742
3743 scid = __le16_to_cpu(rsp->scid);
3744 dcid = __le16_to_cpu(rsp->dcid);
3745 result = __le16_to_cpu(rsp->result);
3746 status = __le16_to_cpu(rsp->status);
3747
1b009c98 3748 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3749 dcid, scid, result, status);
1da177e4 3750
3df91ea2
AE		 3751 mutex_lock(&conn->chan_lock);
3752
1da177e4 3753 if (scid) {
3df91ea2
AE		 3754 chan = __l2cap_get_chan_by_scid(conn, scid);
3755 if (!chan) {
3756 err = -EFAULT;
3757 goto unlock;
3758 }
1da177e4 3759 } else {
3df91ea2
AE		 3760 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3761 if (!chan) {
3762 err = -EFAULT;
3763 goto unlock;
3764 }
1da177e4
LT		 3765 }
3766
3df91ea2
AE		 3767 err = 0;
3768
6be36555 3769 l2cap_chan_lock(chan);
48454079 3770
1da177e4
LT		 3771 switch (result) {
3772 case L2CAP_CR_SUCCESS:
89bc500e 3773 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3774 chan->ident = 0;
fe4128e0 3775 chan->dcid = dcid;
c1360a1c 3776 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3777
c1360a1c 3778 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3779 break;
3780
1da177e4 3781 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3782 l2cap_build_conf_req(chan, req), req);
73ffa904 3783 chan->num_conf_req++;
1da177e4
LT		 3784 break;
3785
3786 case L2CAP_CR_PEND:
c1360a1c 3787 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3788 break;
3789
3790 default:
48454079 3791 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3792 break;
3793 }
3794
6be36555 3795 l2cap_chan_unlock(chan);
3df91ea2
AE		 3796
3797unlock:
3798 mutex_unlock(&conn->chan_lock);
3799
3800 return err;
1da177e4
LT		 3801}
3802
47d1ec61 3803static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3804{
3805 /* FCS is enabled only in ERTM or streaming mode, if one or both
3806 * sides request it.
3807 */
0c1bc5c6 3808 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3809 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3810 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 3811 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3812}
3813
29d8a590
AE		 3814static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3815 u8 ident, u16 flags)
3816{
3817 struct l2cap_conn *conn = chan->conn;
3818
3819 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3820 flags);
3821
3822 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3823 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3824
3825 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3826 l2cap_build_conf_rsp(chan, data,
3827 L2CAP_CONF_SUCCESS, flags), data);
3828}
3829
2d792818
GP		 3830static inline int l2cap_config_req(struct l2cap_conn *conn,
3831 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3832 u8 *data)
1da177e4
LT		 3833{
3834 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3835 u16 dcid, flags;
3836 u8 rsp[64];
48454079 3837 struct l2cap_chan *chan;
3c588192 3838 int len, err = 0;
1da177e4
LT		 3839
3840 dcid = __le16_to_cpu(req->dcid);
3841 flags = __le16_to_cpu(req->flags);
3842
3843 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3844
baa7e1fa 3845 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3846 if (!chan)
1da177e4
LT		 3847 return -ENOENT;
3848
033b1142 3849 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3850 struct l2cap_cmd_rej_cid rej;
3851
ac73498c 3852 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
e2fd318e
IK		 3853 rej.scid = cpu_to_le16(chan->scid);
3854 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3855
df6bd743 3856 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2d792818 3857 sizeof(rej), &rej);
354f60a9 3858 goto unlock;
df6bd743 3859 }
354f60a9 3860
5dee9e7c 3861 /* Reject if config buffer is too small. */
88219a0f 3862 len = cmd_len - sizeof(*req);
7ac28817 3863 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3864 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 3865 l2cap_build_conf_rsp(chan, rsp,
3866 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 3867 goto unlock;
3868 }
3869
3870 /* Store config. */
73ffa904
GP		 3871 memcpy(chan->conf_req + chan->conf_len, req->data, len);
3872 chan->conf_len += len;
1da177e4 3873
59e54bd1 3874 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 3875 /* Incomplete config. Send empty response. */
3876 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 3877 l2cap_build_conf_rsp(chan, rsp,
3878 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 3879 goto unlock;
3880 }
3881
3882 /* Complete config. */
73ffa904 3883 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 3884 if (len < 0) {
5e4e3972 3885 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 3886 goto unlock;
f2fcfcd6 3887 }
1da177e4 3888
1500109b 3889 chan->ident = cmd->ident;
5dee9e7c 3890 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 3891 chan->num_conf_rsp++;
5dee9e7c 3892
5dee9e7c 3893 /* Reset config buffer. */
73ffa904 3894 chan->conf_len = 0;
5dee9e7c 3895
c1360a1c 3896 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 3897 goto unlock;
3898
c1360a1c 3899 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 3900 set_default_fcs(chan);
fcc203c3 3901
105bdf9e
MM		 3902 if (chan->mode == L2CAP_MODE_ERTM ||
3903 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 3904 err = l2cap_ertm_init(chan);
3905
3906 if (err < 0)
5e4e3972 3907 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 3908 else
3909 l2cap_chan_ready(chan);
0565c1c2 3910
876d9484
MH		 3911 goto unlock;
3912 }
3913
c1360a1c 3914 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 3915 u8 buf[64];
1da177e4 3916 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3917 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3918 chan->num_conf_req++;
1da177e4
LT		 3919 }
3920
0e8b207e
AE		 3921 /* Got Conf Rsp PENDING from remote side and asume we sent
3922 Conf Rsp PENDING in the code above */
3923 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 3924 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 3925
3926 /* check compatibility */
3927
79de886d 3928 /* Send rsp for BR/EDR channel */
f351bc72 3929 if (!chan->hs_hcon)
79de886d
AE		 3930 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
3931 else
3932 chan->ident = cmd->ident;
0e8b207e
AE		 3933 }
3934
1da177e4 3935unlock:
6be36555 3936 l2cap_chan_unlock(chan);
3c588192 3937 return err;
1da177e4
LT		 3938}
3939
2d792818
GP		 3940static inline int l2cap_config_rsp(struct l2cap_conn *conn,
3941 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 3942{
3943 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3944 u16 scid, flags, result;
48454079 3945 struct l2cap_chan *chan;
61386cba 3946 int len = le16_to_cpu(cmd->len) - sizeof(*rsp);
3c588192 3947 int err = 0;
1da177e4
LT		 3948
3949 scid = __le16_to_cpu(rsp->scid);
3950 flags = __le16_to_cpu(rsp->flags);
3951 result = __le16_to_cpu(rsp->result);
3952
61386cba
AE		 3953 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
3954 result, len);
1da177e4 3955
baa7e1fa 3956 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3957 if (!chan)
1da177e4
LT		 3958 return 0;
3959
3960 switch (result) {
3961 case L2CAP_CONF_SUCCESS:
47d1ec61 3962 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 3963 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 3964 break;
3965
0e8b207e
AE		 3966 case L2CAP_CONF_PENDING:
3967 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
3968
3969 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3970 char buf[64];
3971
3972 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 3973 buf, &result);
0e8b207e 3974 if (len < 0) {
5e4e3972 3975 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 3976 goto done;
3977 }
3978
f351bc72 3979 if (!chan->hs_hcon) {
79de886d
AE		 3980 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
3981 0);
5ce66b59
AE		 3982 } else {
3983 if (l2cap_check_efs(chan)) {
3984 amp_create_logical_link(chan);
3985 chan->ident = cmd->ident;
3986 }
3987 }
0e8b207e
AE		 3988 }
3989 goto done;
3990
1da177e4 3991 case L2CAP_CONF_UNACCEPT:
73ffa904 3992 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3993 char req[64];
3994
c2c77ec8 3995 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 3996 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 3997 goto done;
3998 }
3999
f2fcfcd6
GP		 4000 /* throw out any old stored conf requests */
4001 result = L2CAP_CONF_SUCCESS;
b4450035 4002 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4003 req, &result);
f2fcfcd6 4004 if (len < 0) {
5e4e3972 4005 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4006 goto done;
4007 }
4008
4009 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4010 L2CAP_CONF_REQ, len, req);
73ffa904 4011 chan->num_conf_req++;
f2fcfcd6
GP		 4012 if (result != L2CAP_CONF_SUCCESS)
4013 goto done;
4014 break;
1da177e4
LT		 4015 }
4016
8e87d142 4017 default:
6be36555 4018 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4019
ba13ccd9 4020 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4021 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4022 goto done;
4023 }
4024
59e54bd1 4025 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4026 goto done;
4027
c1360a1c 4028 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4029
c1360a1c 4030 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4031 set_default_fcs(chan);
fcc203c3 4032
105bdf9e
MM		 4033 if (chan->mode == L2CAP_MODE_ERTM ||
4034 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4035 err = l2cap_ertm_init(chan);
0565c1c2 4036
3c588192 4037 if (err < 0)
5e4e3972 4038 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4039 else
4040 l2cap_chan_ready(chan);
1da177e4
LT		 4041 }
4042
4043done:
6be36555 4044 l2cap_chan_unlock(chan);
3c588192 4045 return err;
1da177e4
LT		 4046}
4047
2d792818
GP		 4048static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4049 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4050{
4051 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4052 struct l2cap_disconn_rsp rsp;
4053 u16 dcid, scid;
48454079 4054 struct l2cap_chan *chan;
1da177e4
LT		 4055 struct sock *sk;
4056
4057 scid = __le16_to_cpu(req->scid);
4058 dcid = __le16_to_cpu(req->dcid);
4059
4060 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4061
3df91ea2
AE		 4062 mutex_lock(&conn->chan_lock);
4063
4064 chan = __l2cap_get_chan_by_scid(conn, dcid);
4065 if (!chan) {
4066 mutex_unlock(&conn->chan_lock);
1da177e4 4067 return 0;
3df91ea2 4068 }
1da177e4 4069
6be36555
AE		 4070 l2cap_chan_lock(chan);
4071
48454079
GP		 4072 sk = chan->sk;
4073
fe4128e0
GP		 4074 rsp.dcid = cpu_to_le16(chan->scid);
4075 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4076 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4077
6be36555 4078 lock_sock(sk);
1da177e4 4079 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 4080 release_sock(sk);
1da177e4 4081
61d6ef3e 4082 l2cap_chan_hold(chan);
48454079 4083 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4084
4085 l2cap_chan_unlock(chan);
1da177e4 4086
80b98027 4087 chan->ops->close(chan);
61d6ef3e 4088 l2cap_chan_put(chan);
3df91ea2
AE		 4089
4090 mutex_unlock(&conn->chan_lock);
4091
1da177e4
LT		 4092 return 0;
4093}
4094
2d792818
GP		 4095static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4096 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4097{
4098 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4099 u16 dcid, scid;
48454079 4100 struct l2cap_chan *chan;
1da177e4
LT		 4101
4102 scid = __le16_to_cpu(rsp->scid);
4103 dcid = __le16_to_cpu(rsp->dcid);
4104
4105 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4106
3df91ea2
AE		 4107 mutex_lock(&conn->chan_lock);
4108
4109 chan = __l2cap_get_chan_by_scid(conn, scid);
4110 if (!chan) {
4111 mutex_unlock(&conn->chan_lock);
1da177e4 4112 return 0;
3df91ea2 4113 }
1da177e4 4114
6be36555 4115 l2cap_chan_lock(chan);
48454079 4116
61d6ef3e 4117 l2cap_chan_hold(chan);
48454079 4118 l2cap_chan_del(chan, 0);
6be36555
AE		 4119
4120 l2cap_chan_unlock(chan);
1da177e4 4121
80b98027 4122 chan->ops->close(chan);
61d6ef3e 4123 l2cap_chan_put(chan);
3df91ea2
AE		 4124
4125 mutex_unlock(&conn->chan_lock);
4126
1da177e4
LT		 4127 return 0;
4128}
4129
2d792818
GP		 4130static inline int l2cap_information_req(struct l2cap_conn *conn,
4131 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4132{
4133 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4134 u16 type;
4135
4136 type = __le16_to_cpu(req->type);
4137
4138 BT_DBG("type 0x%4.4x", type);
4139
f0709e03
MH		 4140 if (type == L2CAP_IT_FEAT_MASK) {
4141 u8 buf[8];
44dd46de 4142 u32 feat_mask = l2cap_feat_mask;
f0709e03 4143 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4144 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4145 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4146 if (!disable_ertm)
fcc203c3 4147 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4148 | L2CAP_FEAT_FCS;
a5fd6f30 4149 if (enable_hs)
6327eb98 4150 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4151 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4152
1b7bf4ed 4153 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4154 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4155 buf);
e1027a7c
MH		 4156 } else if (type == L2CAP_IT_FIXED_CHAN) {
4157 u8 buf[12];
4158 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 4159
4160 if (enable_hs)
4161 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4162 else
4163 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4164
ac73498c
AE		 4165 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4166 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4167 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4168 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4169 buf);
f0709e03
MH		 4170 } else {
4171 struct l2cap_info_rsp rsp;
4172 rsp.type = cpu_to_le16(type);
ac73498c 4173 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4174 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4175 &rsp);
f0709e03 4176 }
1da177e4
LT		 4177
4178 return 0;
4179}
4180
2d792818
GP		 4181static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4182 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4183{
4184 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4185 u16 type, result;
4186
4187 type = __le16_to_cpu(rsp->type);
4188 result = __le16_to_cpu(rsp->result);
4189
4190 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4191
e90165be
AE		 4192 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4193 if (cmd->ident != conn->info_ident ||
2d792818 4194 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4195 return 0;
4196
17cd3f37 4197 cancel_delayed_work(&conn->info_timer);
4e8402a3 4198
adb08ede
VT		 4199 if (result != L2CAP_IR_SUCCESS) {
4200 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4201 conn->info_ident = 0;
4202
4203 l2cap_conn_start(conn);
4204
4205 return 0;
4206 }
4207
978c93b9
AE		 4208 switch (type) {
4209 case L2CAP_IT_FEAT_MASK:
83985319 4210 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4211
47ec1dcd 4212 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4213 struct l2cap_info_req req;
ac73498c 4214 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4215
4216 conn->info_ident = l2cap_get_ident(conn);
4217
4218 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4219 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4220 } else {
4221 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4222 conn->info_ident = 0;
4223
4224 l2cap_conn_start(conn);
4225 }
978c93b9
AE		 4226 break;
4227
4228 case L2CAP_IT_FIXED_CHAN:
4229 conn->fixed_chan_mask = rsp->data[0];
984947dc 4230 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4231 conn->info_ident = 0;
984947dc
MH		 4232
4233 l2cap_conn_start(conn);
978c93b9 4234 break;
984947dc 4235 }
4e8402a3 4236
1da177e4
LT		 4237 return 0;
4238}
4239
1700915f
MM		 4240static int l2cap_create_channel_req(struct l2cap_conn *conn,
4241 struct l2cap_cmd_hdr *cmd,
4242 u16 cmd_len, void *data)
f94ff6ff
MM		 4243{
4244 struct l2cap_create_chan_req *req = data;
6e1df6a6 4245 struct l2cap_create_chan_rsp rsp;
1700915f 4246 struct l2cap_chan *chan;
6e1df6a6 4247 struct hci_dev *hdev;
f94ff6ff
MM		 4248 u16 psm, scid;
4249
4250 if (cmd_len != sizeof(*req))
4251 return -EPROTO;
4252
4253 if (!enable_hs)
4254 return -EINVAL;
4255
4256 psm = le16_to_cpu(req->psm);
4257 scid = le16_to_cpu(req->scid);
4258
ad0ac6ca 4259 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4260
6e1df6a6
AE		 4261 /* For controller id 0 make BR/EDR connection */
4262 if (req->amp_id == HCI_BREDR_ID) {
4263 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4264 req->amp_id);
4265 return 0;
4266 }
1700915f 4267
6e1df6a6
AE		 4268 /* Validate AMP controller id */
4269 hdev = hci_dev_get(req->amp_id);
4270 if (!hdev)
4271 goto error;
1700915f 4272
6e1df6a6
AE		 4273 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4274 hci_dev_put(hdev);
4275 goto error;
4276 }
1700915f 4277
6e1df6a6
AE		 4278 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4279 req->amp_id);
4280 if (chan) {
4281 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4282 struct hci_conn *hs_hcon;
1700915f 4283
6e1df6a6
AE		 4284 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst);
4285 if (!hs_hcon) {
4286 hci_dev_put(hdev);
4287 return -EFAULT;
1700915f
MM		 4288 }
4289
6e1df6a6
AE		 4290 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4291
6e1df6a6
AE		 4292 mgr->bredr_chan = chan;
4293 chan->hs_hcon = hs_hcon;
fd45bf4c 4294 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4295 conn->mtu = hdev->block_mtu;
1700915f 4296 }
f94ff6ff 4297
6e1df6a6 4298 hci_dev_put(hdev);
f94ff6ff
MM		 4299
4300 return 0;
6e1df6a6
AE		 4301
4302error:
4303 rsp.dcid = 0;
4304 rsp.scid = cpu_to_le16(scid);
4305 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4306 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4307
4308 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4309 sizeof(rsp), &rsp);
4310
4311 return -EFAULT;
f94ff6ff
MM		 4312}
4313
8eb200bd
MM		 4314static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4315{
4316 struct l2cap_move_chan_req req;
4317 u8 ident;
4318
4319 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4320
4321 ident = l2cap_get_ident(chan->conn);
4322 chan->ident = ident;
4323
4324 req.icid = cpu_to_le16(chan->scid);
4325 req.dest_amp_id = dest_amp_id;
4326
4327 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4328 &req);
4329
4330 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4331}
4332
1500109b 4333static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4334{
4335 struct l2cap_move_chan_rsp rsp;
4336
1500109b 4337 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4338
1500109b 4339 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4340 rsp.result = cpu_to_le16(result);
4341
1500109b
MM		 4342 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4343 sizeof(rsp), &rsp);
8d5a04a1
MM		 4344}
4345
5b155ef9 4346static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4347{
4348 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4349
5b155ef9 4350 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4351
5b155ef9 4352 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4353
5b155ef9 4354 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4355 cfm.result = cpu_to_le16(result);
4356
5b155ef9
MM		 4357 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4358 sizeof(cfm), &cfm);
4359
4360 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4361}
4362
4363static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4364{
4365 struct l2cap_move_chan_cfm cfm;
4366
4367 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4368
4369 cfm.icid = cpu_to_le16(icid);
4370 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4371
4372 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4373 sizeof(cfm), &cfm);
8d5a04a1
MM		 4374}
4375
4376static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4377 u16 icid)
8d5a04a1
MM		 4378{
4379 struct l2cap_move_chan_cfm_rsp rsp;
4380
ad0ac6ca 4381 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4382
4383 rsp.icid = cpu_to_le16(icid);
4384 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4385}
4386
5f3847a4
MM		 4387static void __release_logical_link(struct l2cap_chan *chan)
4388{
4389 chan->hs_hchan = NULL;
4390 chan->hs_hcon = NULL;
4391
4392 /* Placeholder - release the logical link */
4393}
4394
1500109b
MM		 4395static void l2cap_logical_fail(struct l2cap_chan *chan)
4396{
4397 /* Logical link setup failed */
4398 if (chan->state != BT_CONNECTED) {
4399 /* Create channel failure, disconnect */
5e4e3972 4400 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4401 return;
4402 }
4403
4404 switch (chan->move_role) {
4405 case L2CAP_MOVE_ROLE_RESPONDER:
4406 l2cap_move_done(chan);
4407 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4408 break;
4409 case L2CAP_MOVE_ROLE_INITIATOR:
4410 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4411 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4412 /* Remote has only sent pending or
4413 * success responses, clean up
4414 */
4415 l2cap_move_done(chan);
4416 }
4417
4418 /* Other amp move states imply that the move
4419 * has already aborted
4420 */
4421 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4422 break;
4423 }
4424}
4425
4426static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4427 struct hci_chan *hchan)
4428{
4429 struct l2cap_conf_rsp rsp;
1500109b 4430
336178a3 4431 chan->hs_hchan = hchan;
1500109b
MM		 4432 chan->hs_hcon->l2cap_data = chan->conn;
4433
35ba9561 4434 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4435
4436 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4437 int err;
1500109b
MM		 4438
4439 set_default_fcs(chan);
4440
4441 err = l2cap_ertm_init(chan);
4442 if (err < 0)
5e4e3972 4443 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4444 else
4445 l2cap_chan_ready(chan);
4446 }
4447}
4448
4449static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4450 struct hci_chan *hchan)
4451{
4452 chan->hs_hcon = hchan->conn;
4453 chan->hs_hcon->l2cap_data = chan->conn;
4454
4455 BT_DBG("move_state %d", chan->move_state);
4456
4457 switch (chan->move_state) {
4458 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4459 /* Move confirm will be sent after a success
4460 * response is received
4461 */
4462 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4463 break;
4464 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4465 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4466 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4467 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4468 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4469 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4470 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4471 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4472 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4473 }
4474 break;
4475 default:
4476 /* Move was not in expected state, free the channel */
4477 __release_logical_link(chan);
4478
4479 chan->move_state = L2CAP_MOVE_STABLE;
4480 }
4481}
4482
4483/* Call with chan locked */
27695fb4
AE		 4484void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4485 u8 status)
5b155ef9 4486{
1500109b
MM		 4487 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4488
4489 if (status) {
4490 l2cap_logical_fail(chan);
4491 __release_logical_link(chan);
4492 return;
4493 }
4494
4495 if (chan->state != BT_CONNECTED) {
4496 /* Ignore logical link if channel is on BR/EDR */
4497 if (chan->local_amp_id)
4498 l2cap_logical_finish_create(chan, hchan);
4499 } else {
4500 l2cap_logical_finish_move(chan, hchan);
4501 }
5b155ef9
MM		 4502}
4503
3f7a56c4
MM		 4504void l2cap_move_start(struct l2cap_chan *chan)
4505{
4506 BT_DBG("chan %p", chan);
4507
4508 if (chan->local_amp_id == HCI_BREDR_ID) {
4509 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4510 return;
4511 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4512 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4513 /* Placeholder - start physical link setup */
4514 } else {
4515 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4516 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4517 chan->move_id = 0;
4518 l2cap_move_setup(chan);
4519 l2cap_send_move_chan_req(chan, 0);
4520 }
4521}
4522
8eb200bd
MM		 4523static void l2cap_do_create(struct l2cap_chan *chan, int result,
4524 u8 local_amp_id, u8 remote_amp_id)
4525{
62748ca1
AE		 4526 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4527 local_amp_id, remote_amp_id);
4528
12d6cc60
AE		 4529 chan->fcs = L2CAP_FCS_NONE;
4530
62748ca1
AE		 4531 /* Outgoing channel on AMP */
4532 if (chan->state == BT_CONNECT) {
4533 if (result == L2CAP_CR_SUCCESS) {
4534 chan->local_amp_id = local_amp_id;
4535 l2cap_send_create_chan_req(chan, remote_amp_id);
4536 } else {
4537 /* Revert to BR/EDR connect */
4538 l2cap_send_conn_req(chan);
4539 }
4540
4541 return;
4542 }
4543
4544 /* Incoming channel on AMP */
4545 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4546 struct l2cap_conn_rsp rsp;
4547 char buf[128];
4548 rsp.scid = cpu_to_le16(chan->dcid);
4549 rsp.dcid = cpu_to_le16(chan->scid);
4550
8eb200bd
MM		 4551 if (result == L2CAP_CR_SUCCESS) {
4552 /* Send successful response */
62cd50e2
AE		 4553 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4554 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4555 } else {
4556 /* Send negative response */
62cd50e2
AE		 4557 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4558 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4559 }
4560
4561 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4562 sizeof(rsp), &rsp);
4563
4564 if (result == L2CAP_CR_SUCCESS) {
4565 __l2cap_state_change(chan, BT_CONFIG);
4566 set_bit(CONF_REQ_SENT, &chan->conf_state);
4567 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4568 L2CAP_CONF_REQ,
4569 l2cap_build_conf_req(chan, buf), buf);
4570 chan->num_conf_req++;
4571 }
8eb200bd
MM		 4572 }
4573}
4574
4575static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4576 u8 remote_amp_id)
4577{
4578 l2cap_move_setup(chan);
4579 chan->move_id = local_amp_id;
4580 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4581
4582 l2cap_send_move_chan_req(chan, remote_amp_id);
4583}
4584
4585static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4586{
4587 struct hci_chan *hchan = NULL;
4588
4589 /* Placeholder - get hci_chan for logical link */
4590
4591 if (hchan) {
4592 if (hchan->state == BT_CONNECTED) {
4593 /* Logical link is ready to go */
4594 chan->hs_hcon = hchan->conn;
4595 chan->hs_hcon->l2cap_data = chan->conn;
4596 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4597 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4598
4599 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4600 } else {
4601 /* Wait for logical link to be ready */
4602 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4603 }
4604 } else {
4605 /* Logical link not available */
4606 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4607 }
4608}
4609
4610static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4611{
4612 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4613 u8 rsp_result;
4614 if (result == -EINVAL)
4615 rsp_result = L2CAP_MR_BAD_ID;
4616 else
4617 rsp_result = L2CAP_MR_NOT_ALLOWED;
4618
4619 l2cap_send_move_chan_rsp(chan, rsp_result);
4620 }
4621
4622 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4623 chan->move_state = L2CAP_MOVE_STABLE;
4624
4625 /* Restart data transmission */
4626 l2cap_ertm_send(chan);
4627}
4628
a514b17f
AE		 4629/* Invoke with locked chan */
4630void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4631{
770bfefa 4632 u8 local_amp_id = chan->local_amp_id;
fffadc08 4633 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4634
8eb200bd
MM		 4635 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4636 chan, result, local_amp_id, remote_amp_id);
4637
8eb200bd
MM		 4638 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4639 l2cap_chan_unlock(chan);
4640 return;
4641 }
4642
4643 if (chan->state != BT_CONNECTED) {
4644 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4645 } else if (result != L2CAP_MR_SUCCESS) {
4646 l2cap_do_move_cancel(chan, result);
4647 } else {
4648 switch (chan->move_role) {
4649 case L2CAP_MOVE_ROLE_INITIATOR:
4650 l2cap_do_move_initiate(chan, local_amp_id,
4651 remote_amp_id);
4652 break;
4653 case L2CAP_MOVE_ROLE_RESPONDER:
4654 l2cap_do_move_respond(chan, result);
4655 break;
4656 default:
4657 l2cap_do_move_cancel(chan, result);
4658 break;
4659 }
4660 }
8eb200bd
MM		 4661}
4662
8d5a04a1 4663static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4664 struct l2cap_cmd_hdr *cmd,
4665 u16 cmd_len, void *data)
8d5a04a1
MM		 4666{
4667 struct l2cap_move_chan_req *req = data;
1500109b 4668 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4669 struct l2cap_chan *chan;
8d5a04a1
MM		 4670 u16 icid = 0;
4671 u16 result = L2CAP_MR_NOT_ALLOWED;
4672
4673 if (cmd_len != sizeof(*req))
4674 return -EPROTO;
4675
4676 icid = le16_to_cpu(req->icid);
4677
ad0ac6ca 4678 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1
MM		 4679
4680 if (!enable_hs)
4681 return -EINVAL;
4682
02b0fbb9
MM		 4683 chan = l2cap_get_chan_by_dcid(conn, icid);
4684 if (!chan) {
1500109b
MM		 4685 rsp.icid = cpu_to_le16(icid);
4686 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4687 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4688 sizeof(rsp), &rsp);
02b0fbb9
MM		 4689 return 0;
4690 }
4691
1500109b
MM		 4692 chan->ident = cmd->ident;
4693
02b0fbb9
MM		 4694 if (chan->scid < L2CAP_CID_DYN_START ||
4695 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4696 (chan->mode != L2CAP_MODE_ERTM &&
4697 chan->mode != L2CAP_MODE_STREAMING)) {
4698 result = L2CAP_MR_NOT_ALLOWED;
4699 goto send_move_response;
4700 }
4701
4702 if (chan->local_amp_id == req->dest_amp_id) {
4703 result = L2CAP_MR_SAME_ID;
4704 goto send_move_response;
4705 }
4706
4707 if (req->dest_amp_id) {
4708 struct hci_dev *hdev;
4709 hdev = hci_dev_get(req->dest_amp_id);
4710 if (!hdev || hdev->dev_type != HCI_AMP ||
4711 !test_bit(HCI_UP, &hdev->flags)) {
4712 if (hdev)
4713 hci_dev_put(hdev);
4714
4715 result = L2CAP_MR_BAD_ID;
4716 goto send_move_response;
4717 }
4718 hci_dev_put(hdev);
4719 }
4720
4721 /* Detect a move collision. Only send a collision response
4722 * if this side has "lost", otherwise proceed with the move.
4723 * The winner has the larger bd_addr.
4724 */
4725 if ((__chan_is_moving(chan) ||
4726 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4727 bacmp(conn->src, conn->dst) > 0) {
4728 result = L2CAP_MR_COLLISION;
4729 goto send_move_response;
4730 }
4731
02b0fbb9
MM		 4732 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4733 l2cap_move_setup(chan);
4734 chan->move_id = req->dest_amp_id;
4735 icid = chan->dcid;
4736
4737 if (!req->dest_amp_id) {
4738 /* Moving to BR/EDR */
4739 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4740 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4741 result = L2CAP_MR_PEND;
4742 } else {
4743 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4744 result = L2CAP_MR_SUCCESS;
4745 }
4746 } else {
4747 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4748 /* Placeholder - uncomment when amp functions are available */
4749 /*amp_accept_physical(chan, req->dest_amp_id);*/
4750 result = L2CAP_MR_PEND;
4751 }
4752
4753send_move_response:
1500109b 4754 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4755
02b0fbb9
MM		 4756 l2cap_chan_unlock(chan);
4757
8d5a04a1
MM		 4758 return 0;
4759}
4760
5b155ef9
MM		 4761static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4762{
4763 struct l2cap_chan *chan;
4764 struct hci_chan *hchan = NULL;
4765
4766 chan = l2cap_get_chan_by_scid(conn, icid);
4767 if (!chan) {
4768 l2cap_send_move_chan_cfm_icid(conn, icid);
4769 return;
4770 }
4771
4772 __clear_chan_timer(chan);
4773 if (result == L2CAP_MR_PEND)
4774 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4775
4776 switch (chan->move_state) {
4777 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4778 /* Move confirm will be sent when logical link
4779 * is complete.
4780 */
4781 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4782 break;
4783 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4784 if (result == L2CAP_MR_PEND) {
4785 break;
4786 } else if (test_bit(CONN_LOCAL_BUSY,
4787 &chan->conn_state)) {
4788 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4789 } else {
4790 /* Logical link is up or moving to BR/EDR,
4791 * proceed with move
4792 */
4793 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4794 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4795 }
4796 break;
4797 case L2CAP_MOVE_WAIT_RSP:
4798 /* Moving to AMP */
4799 if (result == L2CAP_MR_SUCCESS) {
4800 /* Remote is ready, send confirm immediately
4801 * after logical link is ready
4802 */
4803 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4804 } else {
4805 /* Both logical link and move success
4806 * are required to confirm
4807 */
4808 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4809 }
4810
4811 /* Placeholder - get hci_chan for logical link */
4812 if (!hchan) {
4813 /* Logical link not available */
4814 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4815 break;
4816 }
4817
4818 /* If the logical link is not yet connected, do not
4819 * send confirmation.
4820 */
4821 if (hchan->state != BT_CONNECTED)
4822 break;
4823
4824 /* Logical link is already ready to go */
4825
4826 chan->hs_hcon = hchan->conn;
4827 chan->hs_hcon->l2cap_data = chan->conn;
4828
4829 if (result == L2CAP_MR_SUCCESS) {
4830 /* Can confirm now */
4831 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4832 } else {
4833 /* Now only need move success
4834 * to confirm
4835 */
4836 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4837 }
4838
4839 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4840 break;
4841 default:
4842 /* Any other amp move state means the move failed. */
4843 chan->move_id = chan->local_amp_id;
4844 l2cap_move_done(chan);
4845 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4846 }
4847
4848 l2cap_chan_unlock(chan);
4849}
4850
4851static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
4852 u16 result)
4853{
4854 struct l2cap_chan *chan;
4855
4856 chan = l2cap_get_chan_by_ident(conn, ident);
4857 if (!chan) {
4858 /* Could not locate channel, icid is best guess */
4859 l2cap_send_move_chan_cfm_icid(conn, icid);
4860 return;
4861 }
4862
4863 __clear_chan_timer(chan);
4864
4865 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4866 if (result == L2CAP_MR_COLLISION) {
4867 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4868 } else {
4869 /* Cleanup - cancel move */
4870 chan->move_id = chan->local_amp_id;
4871 l2cap_move_done(chan);
4872 }
4873 }
4874
4875 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4876
4877 l2cap_chan_unlock(chan);
4878}
4879
4880static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
4881 struct l2cap_cmd_hdr *cmd,
4882 u16 cmd_len, void *data)
8d5a04a1
MM		 4883{
4884 struct l2cap_move_chan_rsp *rsp = data;
4885 u16 icid, result;
4886
4887 if (cmd_len != sizeof(*rsp))
4888 return -EPROTO;
4889
4890 icid = le16_to_cpu(rsp->icid);
4891 result = le16_to_cpu(rsp->result);
4892
ad0ac6ca 4893 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 4894
5b155ef9
MM		 4895 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
4896 l2cap_move_continue(conn, icid, result);
4897 else
4898 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 4899
4900 return 0;
4901}
4902
5f3847a4
MM		 4903static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
4904 struct l2cap_cmd_hdr *cmd,
4905 u16 cmd_len, void *data)
8d5a04a1
MM		 4906{
4907 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 4908 struct l2cap_chan *chan;
8d5a04a1
MM		 4909 u16 icid, result;
4910
4911 if (cmd_len != sizeof(*cfm))
4912 return -EPROTO;
4913
4914 icid = le16_to_cpu(cfm->icid);
4915 result = le16_to_cpu(cfm->result);
4916
ad0ac6ca 4917 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 4918
5f3847a4
MM		 4919 chan = l2cap_get_chan_by_dcid(conn, icid);
4920 if (!chan) {
4921 /* Spec requires a response even if the icid was not found */
4922 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4923 return 0;
4924 }
4925
4926 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
4927 if (result == L2CAP_MC_CONFIRMED) {
4928 chan->local_amp_id = chan->move_id;
4929 if (!chan->local_amp_id)
4930 __release_logical_link(chan);
4931 } else {
4932 chan->move_id = chan->local_amp_id;
4933 }
4934
4935 l2cap_move_done(chan);
4936 }
4937
8d5a04a1
MM		 4938 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4939
5f3847a4
MM		 4940 l2cap_chan_unlock(chan);
4941
8d5a04a1
MM		 4942 return 0;
4943}
4944
4945static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 4946 struct l2cap_cmd_hdr *cmd,
4947 u16 cmd_len, void *data)
8d5a04a1
MM		 4948{
4949 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 4950 struct l2cap_chan *chan;
8d5a04a1
MM		 4951 u16 icid;
4952
4953 if (cmd_len != sizeof(*rsp))
4954 return -EPROTO;
4955
4956 icid = le16_to_cpu(rsp->icid);
4957
ad0ac6ca 4958 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 4959
3fd71a0a
MM		 4960 chan = l2cap_get_chan_by_scid(conn, icid);
4961 if (!chan)
4962 return 0;
4963
4964 __clear_chan_timer(chan);
4965
4966 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
4967 chan->local_amp_id = chan->move_id;
4968
4969 if (!chan->local_amp_id && chan->hs_hchan)
4970 __release_logical_link(chan);
4971
4972 l2cap_move_done(chan);
4973 }
4974
4975 l2cap_chan_unlock(chan);
4976
8d5a04a1
MM		 4977 return 0;
4978}
4979
e2174ca4 4980static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 4981 u16 to_multiplier)
de73115a
CT		 4982{
4983 u16 max_latency;
4984
4985 if (min > max || min < 6 || max > 3200)
4986 return -EINVAL;
4987
4988 if (to_multiplier < 10 || to_multiplier > 3200)
4989 return -EINVAL;
4990
4991 if (max >= to_multiplier * 8)
4992 return -EINVAL;
4993
4994 max_latency = (to_multiplier * 8 / max) - 1;
4995 if (latency > 499 || latency > max_latency)
4996 return -EINVAL;
4997
4998 return 0;
4999}
5000
5001static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818
GP		 5002 struct l2cap_cmd_hdr *cmd,
5003 u8 *data)
de73115a
CT		 5004{
5005 struct hci_conn *hcon = conn->hcon;
5006 struct l2cap_conn_param_update_req *req;
5007 struct l2cap_conn_param_update_rsp rsp;
5008 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 5009 int err;
de73115a
CT		 5010
5011 if (!(hcon->link_mode & HCI_LM_MASTER))
5012 return -EINVAL;
5013
5014 cmd_len = __le16_to_cpu(cmd->len);
5015 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5016 return -EPROTO;
5017
5018 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5019 min = __le16_to_cpu(req->min);
5020 max = __le16_to_cpu(req->max);
de73115a
CT		 5021 latency = __le16_to_cpu(req->latency);
5022 to_multiplier = __le16_to_cpu(req->to_multiplier);
5023
5024 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5025 min, max, latency, to_multiplier);
de73115a
CT		 5026
5027 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5028
5029 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5030 if (err)
ac73498c 5031 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5032 else
ac73498c 5033 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5034
5035 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5036 sizeof(rsp), &rsp);
de73115a 5037
2ce603eb
CT		 5038 if (!err)
5039 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5040
de73115a
CT		 5041 return 0;
5042}
5043
3300d9a9 5044static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5045 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5046 u8 *data)
3300d9a9
CT		 5047{
5048 int err = 0;
5049
5050 switch (cmd->code) {
5051 case L2CAP_COMMAND_REJ:
5052 l2cap_command_rej(conn, cmd, data);
5053 break;
5054
5055 case L2CAP_CONN_REQ:
5056 err = l2cap_connect_req(conn, cmd, data);
5057 break;
5058
5059 case L2CAP_CONN_RSP:
f5a2598d 5060 case L2CAP_CREATE_CHAN_RSP:
5909cf30 5061 err = l2cap_connect_create_rsp(conn, cmd, data);
3300d9a9
CT		 5062 break;
5063
5064 case L2CAP_CONF_REQ:
5065 err = l2cap_config_req(conn, cmd, cmd_len, data);
5066 break;
5067
5068 case L2CAP_CONF_RSP:
5069 err = l2cap_config_rsp(conn, cmd, data);
5070 break;
5071
5072 case L2CAP_DISCONN_REQ:
5073 err = l2cap_disconnect_req(conn, cmd, data);
5074 break;
5075
5076 case L2CAP_DISCONN_RSP:
5077 err = l2cap_disconnect_rsp(conn, cmd, data);
5078 break;
5079
5080 case L2CAP_ECHO_REQ:
5081 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5082 break;
5083
5084 case L2CAP_ECHO_RSP:
5085 break;
5086
5087 case L2CAP_INFO_REQ:
5088 err = l2cap_information_req(conn, cmd, data);
5089 break;
5090
5091 case L2CAP_INFO_RSP:
5092 err = l2cap_information_rsp(conn, cmd, data);
5093 break;
5094
f94ff6ff
MM		 5095 case L2CAP_CREATE_CHAN_REQ:
5096 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5097 break;
5098
8d5a04a1
MM		 5099 case L2CAP_MOVE_CHAN_REQ:
5100 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5101 break;
5102
5103 case L2CAP_MOVE_CHAN_RSP:
5104 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5105 break;
5106
5107 case L2CAP_MOVE_CHAN_CFM:
5108 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5109 break;
5110
5111 case L2CAP_MOVE_CHAN_CFM_RSP:
5112 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5113 break;
5114
3300d9a9
CT		 5115 default:
5116 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5117 err = -EINVAL;
5118 break;
5119 }
5120
5121 return err;
5122}
5123
5124static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2d792818 5125 struct l2cap_cmd_hdr *cmd, u8 *data)
3300d9a9
CT		 5126{
5127 switch (cmd->code) {
5128 case L2CAP_COMMAND_REJ:
5129 return 0;
5130
5131 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 5132 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 5133
5134 case L2CAP_CONN_PARAM_UPDATE_RSP:
5135 return 0;
5136
5137 default:
5138 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5139 return -EINVAL;
5140 }
5141}
5142
5143static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5144 struct sk_buff *skb)
1da177e4
LT		 5145{
5146 u8 *data = skb->data;
5147 int len = skb->len;
5148 struct l2cap_cmd_hdr cmd;
3300d9a9 5149 int err;
1da177e4
LT		 5150
5151 l2cap_raw_recv(conn, skb);
5152
5153 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5154 u16 cmd_len;
1da177e4
LT		 5155 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5156 data += L2CAP_CMD_HDR_SIZE;
5157 len -= L2CAP_CMD_HDR_SIZE;
5158
88219a0f 5159 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5160
2d792818
GP		 5161 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5162 cmd.ident);
1da177e4 5163
88219a0f 5164 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5165 BT_DBG("corrupted command");
5166 break;
5167 }
5168
3300d9a9
CT		 5169 if (conn->hcon->type == LE_LINK)
5170 err = l2cap_le_sig_cmd(conn, &cmd, data);
5171 else
5172 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 5173
5174 if (err) {
e2fd318e 5175 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5176
5177 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 5178
5179 /* FIXME: Map err to a valid reason */
ac73498c 5180 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5181 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5182 sizeof(rej), &rej);
1da177e4
LT		 5183 }
5184
88219a0f
AV		 5185 data += cmd_len;
5186 len -= cmd_len;
1da177e4
LT		 5187 }
5188
5189 kfree_skb(skb);
5190}
5191
47d1ec61 5192static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5193{
5194 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5195 int hdr_size;
5196
5197 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5198 hdr_size = L2CAP_EXT_HDR_SIZE;
5199 else
5200 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5201
47d1ec61 5202 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5203 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5204 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5205 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5206
5207 if (our_fcs != rcv_fcs)
7a560e5c 5208 return -EBADMSG;
fcc203c3
GP		 5209 }
5210 return 0;
5211}
5212
6ea00485 5213static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5214{
e31f7633 5215 struct l2cap_ctrl control;
d5392c8f 5216
e31f7633 5217 BT_DBG("chan %p", chan);
d5392c8f 5218
e31f7633
MM		 5219 memset(&control, 0, sizeof(control));
5220 control.sframe = 1;
5221 control.final = 1;
5222 control.reqseq = chan->buffer_seq;
5223 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5224
e2ab4353 5225 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5226 control.super = L2CAP_SUPER_RNR;
5227 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5228 }
5229
e31f7633
MM		 5230 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5231 chan->unacked_frames > 0)
5232 __set_retrans_timer(chan);
d5392c8f 5233
e31f7633 5234 /* Send pending iframes */
525cd185 5235 l2cap_ertm_send(chan);
d5392c8f 5236
e2ab4353 5237 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5238 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5239 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5240 * send it now.
5241 */
5242 control.super = L2CAP_SUPER_RR;
5243 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5244 }
5245}
5246
2d792818
GP		 5247static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5248 struct sk_buff **last_frag)
18778a63 5249{
84084a31
MM		 5250 /* skb->len reflects data in skb as well as all fragments
5251 * skb->data_len reflects only data in fragments
5252 */
5253 if (!skb_has_frag_list(skb))
5254 skb_shinfo(skb)->frag_list = new_frag;
5255
5256 new_frag->next = NULL;
5257
5258 (*last_frag)->next = new_frag;
5259 *last_frag = new_frag;
5260
5261 skb->len += new_frag->len;
5262 skb->data_len += new_frag->len;
5263 skb->truesize += new_frag->truesize;
5264}
5265
4b51dae9
MM		 5266static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5267 struct l2cap_ctrl *control)
84084a31
MM		 5268{
5269 int err = -EINVAL;
18778a63 5270
4b51dae9 5271 switch (control->sar) {
7e0ef6ee 5272 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5273 if (chan->sdu)
5274 break;
18778a63 5275
80b98027 5276 err = chan->ops->recv(chan, skb);
84084a31 5277 break;
18778a63 5278
7e0ef6ee 5279 case L2CAP_SAR_START:
84084a31
MM		 5280 if (chan->sdu)
5281 break;
18778a63 5282
6f61fd47 5283 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5284 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5285
84084a31
MM		 5286 if (chan->sdu_len > chan->imtu) {
5287 err = -EMSGSIZE;
5288 break;
5289 }
1890d36b 5290
84084a31
MM		 5291 if (skb->len >= chan->sdu_len)
5292 break;
18778a63 5293
84084a31
MM		 5294 chan->sdu = skb;
5295 chan->sdu_last_frag = skb;
18778a63 5296
84084a31
MM		 5297 skb = NULL;
5298 err = 0;
18778a63
GP		 5299 break;
5300
7e0ef6ee 5301 case L2CAP_SAR_CONTINUE:
6f61fd47 5302 if (!chan->sdu)
84084a31 5303 break;
18778a63 5304
84084a31
MM		 5305 append_skb_frag(chan->sdu, skb,
5306 &chan->sdu_last_frag);
5307 skb = NULL;
18778a63 5308
84084a31
MM		 5309 if (chan->sdu->len >= chan->sdu_len)
5310 break;
4178ba46 5311
84084a31 5312 err = 0;
18778a63
GP		 5313 break;
5314
7e0ef6ee 5315 case L2CAP_SAR_END:
6f61fd47 5316 if (!chan->sdu)
84084a31 5317 break;
18778a63 5318
84084a31
MM		 5319 append_skb_frag(chan->sdu, skb,
5320 &chan->sdu_last_frag);
5321 skb = NULL;
4178ba46 5322
84084a31
MM		 5323 if (chan->sdu->len != chan->sdu_len)
5324 break;
18778a63 5325
80b98027 5326 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5327
84084a31
MM		 5328 if (!err) {
5329 /* Reassembly complete */
5330 chan->sdu = NULL;
5331 chan->sdu_last_frag = NULL;
5332 chan->sdu_len = 0;
1890d36b 5333 }
18778a63
GP		 5334 break;
5335 }
5336
84084a31
MM		 5337 if (err) {
5338 kfree_skb(skb);
5339 kfree_skb(chan->sdu);
5340 chan->sdu = NULL;
5341 chan->sdu_last_frag = NULL;
5342 chan->sdu_len = 0;
5343 }
18778a63 5344
84084a31 5345 return err;
18778a63
GP		 5346}
5347
32b32735
MM		 5348static int l2cap_resegment(struct l2cap_chan *chan)
5349{
5350 /* Placeholder */
5351 return 0;
5352}
5353
61aa4f5b 5354void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5355{
61aa4f5b 5356 u8 event;
712132eb 5357
61aa4f5b
MM		 5358 if (chan->mode != L2CAP_MODE_ERTM)
5359 return;
712132eb 5360
61aa4f5b 5361 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5362 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5363}
5364
d2a7ac5d
MM		 5365static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5366{
63838725
MM		 5367 int err = 0;
5368 /* Pass sequential frames to l2cap_reassemble_sdu()
5369 * until a gap is encountered.
5370 */
5371
5372 BT_DBG("chan %p", chan);
5373
5374 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5375 struct sk_buff *skb;
5376 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5377 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5378
5379 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5380
5381 if (!skb)
5382 break;
5383
5384 skb_unlink(skb, &chan->srej_q);
5385 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5386 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5387 if (err)
5388 break;
5389 }
5390
5391 if (skb_queue_empty(&chan->srej_q)) {
5392 chan->rx_state = L2CAP_RX_STATE_RECV;
5393 l2cap_send_ack(chan);
5394 }
5395
5396 return err;
d2a7ac5d
MM		 5397}
5398
5399static void l2cap_handle_srej(struct l2cap_chan *chan,
5400 struct l2cap_ctrl *control)
5401{
f80842a8
MM		 5402 struct sk_buff *skb;
5403
5404 BT_DBG("chan %p, control %p", chan, control);
5405
5406 if (control->reqseq == chan->next_tx_seq) {
5407 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5408 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5409 return;
5410 }
5411
5412 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5413
5414 if (skb == NULL) {
5415 BT_DBG("Seq %d not available for retransmission",
5416 control->reqseq);
5417 return;
5418 }
5419
5420 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5421 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5422 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5423 return;
5424 }
5425
5426 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5427
5428 if (control->poll) {
5429 l2cap_pass_to_tx(chan, control);
5430
5431 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5432 l2cap_retransmit(chan, control);
5433 l2cap_ertm_send(chan);
5434
5435 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5436 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5437 chan->srej_save_reqseq = control->reqseq;
5438 }
5439 } else {
5440 l2cap_pass_to_tx_fbit(chan, control);
5441
5442 if (control->final) {
5443 if (chan->srej_save_reqseq != control->reqseq ||
5444 !test_and_clear_bit(CONN_SREJ_ACT,
5445 &chan->conn_state))
5446 l2cap_retransmit(chan, control);
5447 } else {
5448 l2cap_retransmit(chan, control);
5449 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5450 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5451 chan->srej_save_reqseq = control->reqseq;
5452 }
5453 }
5454 }
d2a7ac5d
MM		 5455}
5456
5457static void l2cap_handle_rej(struct l2cap_chan *chan,
5458 struct l2cap_ctrl *control)
5459{
fcd289df
MM		 5460 struct sk_buff *skb;
5461
5462 BT_DBG("chan %p, control %p", chan, control);
5463
5464 if (control->reqseq == chan->next_tx_seq) {
5465 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5466 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5467 return;
5468 }
5469
5470 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5471
5472 if (chan->max_tx && skb &&
5473 bt_cb(skb)->control.retries >= chan->max_tx) {
5474 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5475 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5476 return;
5477 }
5478
5479 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5480
5481 l2cap_pass_to_tx(chan, control);
5482
5483 if (control->final) {
5484 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5485 l2cap_retransmit_all(chan, control);
5486 } else {
5487 l2cap_retransmit_all(chan, control);
5488 l2cap_ertm_send(chan);
5489 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5490 set_bit(CONN_REJ_ACT, &chan->conn_state);
5491 }
d2a7ac5d
MM		 5492}
5493
4b51dae9
MM		 5494static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5495{
5496 BT_DBG("chan %p, txseq %d", chan, txseq);
5497
5498 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5499 chan->expected_tx_seq);
5500
5501 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5502 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5503 chan->tx_win) {
4b51dae9
MM		 5504 /* See notes below regarding "double poll" and
5505 * invalid packets.
5506 */
5507 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5508 BT_DBG("Invalid/Ignore - after SREJ");
5509 return L2CAP_TXSEQ_INVALID_IGNORE;
5510 } else {
5511 BT_DBG("Invalid - in window after SREJ sent");
5512 return L2CAP_TXSEQ_INVALID;
5513 }
5514 }
5515
5516 if (chan->srej_list.head == txseq) {
5517 BT_DBG("Expected SREJ");
5518 return L2CAP_TXSEQ_EXPECTED_SREJ;
5519 }
5520
5521 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5522 BT_DBG("Duplicate SREJ - txseq already stored");
5523 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5524 }
5525
5526 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5527 BT_DBG("Unexpected SREJ - not requested");
5528 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5529 }
5530 }
5531
5532 if (chan->expected_tx_seq == txseq) {
5533 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5534 chan->tx_win) {
5535 BT_DBG("Invalid - txseq outside tx window");
5536 return L2CAP_TXSEQ_INVALID;
5537 } else {
5538 BT_DBG("Expected");
5539 return L2CAP_TXSEQ_EXPECTED;
5540 }
5541 }
5542
5543 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 5544 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 5545 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5546 return L2CAP_TXSEQ_DUPLICATE;
5547 }
5548
5549 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5550 /* A source of invalid packets is a "double poll" condition,
5551 * where delays cause us to send multiple poll packets. If
5552 * the remote stack receives and processes both polls,
5553 * sequence numbers can wrap around in such a way that a
5554 * resent frame has a sequence number that looks like new data
5555 * with a sequence gap. This would trigger an erroneous SREJ
5556 * request.
5557 *
5558 * Fortunately, this is impossible with a tx window that's
5559 * less than half of the maximum sequence number, which allows
5560 * invalid frames to be safely ignored.
5561 *
5562 * With tx window sizes greater than half of the tx window
5563 * maximum, the frame is invalid and cannot be ignored. This
5564 * causes a disconnect.
5565 */
5566
5567 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5568 BT_DBG("Invalid/Ignore - txseq outside tx window");
5569 return L2CAP_TXSEQ_INVALID_IGNORE;
5570 } else {
5571 BT_DBG("Invalid - txseq outside tx window");
5572 return L2CAP_TXSEQ_INVALID;
5573 }
5574 } else {
5575 BT_DBG("Unexpected - txseq indicates missing frames");
5576 return L2CAP_TXSEQ_UNEXPECTED;
5577 }
5578}
5579
d2a7ac5d
MM		 5580static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5581 struct l2cap_ctrl *control,
5582 struct sk_buff *skb, u8 event)
5583{
5584 int err = 0;
5585 bool skb_in_use = 0;
5586
5587 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5588 event);
5589
5590 switch (event) {
5591 case L2CAP_EV_RECV_IFRAME:
5592 switch (l2cap_classify_txseq(chan, control->txseq)) {
5593 case L2CAP_TXSEQ_EXPECTED:
5594 l2cap_pass_to_tx(chan, control);
5595
5596 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5597 BT_DBG("Busy, discarding expected seq %d",
5598 control->txseq);
5599 break;
5600 }
5601
5602 chan->expected_tx_seq = __next_seq(chan,
5603 control->txseq);
5604
5605 chan->buffer_seq = chan->expected_tx_seq;
5606 skb_in_use = 1;
5607
5608 err = l2cap_reassemble_sdu(chan, skb, control);
5609 if (err)
5610 break;
5611
5612 if (control->final) {
5613 if (!test_and_clear_bit(CONN_REJ_ACT,
5614 &chan->conn_state)) {
5615 control->final = 0;
5616 l2cap_retransmit_all(chan, control);
5617 l2cap_ertm_send(chan);
5618 }
5619 }
5620
5621 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5622 l2cap_send_ack(chan);
5623 break;
5624 case L2CAP_TXSEQ_UNEXPECTED:
5625 l2cap_pass_to_tx(chan, control);
5626
5627 /* Can't issue SREJ frames in the local busy state.
5628 * Drop this frame, it will be seen as missing
5629 * when local busy is exited.
5630 */
5631 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5632 BT_DBG("Busy, discarding unexpected seq %d",
5633 control->txseq);
5634 break;
5635 }
5636
5637 /* There was a gap in the sequence, so an SREJ
5638 * must be sent for each missing frame. The
5639 * current frame is stored for later use.
5640 */
5641 skb_queue_tail(&chan->srej_q, skb);
5642 skb_in_use = 1;
5643 BT_DBG("Queued %p (queue len %d)", skb,
5644 skb_queue_len(&chan->srej_q));
5645
5646 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5647 l2cap_seq_list_clear(&chan->srej_list);
5648 l2cap_send_srej(chan, control->txseq);
5649
5650 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5651 break;
5652 case L2CAP_TXSEQ_DUPLICATE:
5653 l2cap_pass_to_tx(chan, control);
5654 break;
5655 case L2CAP_TXSEQ_INVALID_IGNORE:
5656 break;
5657 case L2CAP_TXSEQ_INVALID:
5658 default:
5e4e3972 5659 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5660 break;
5661 }
5662 break;
5663 case L2CAP_EV_RECV_RR:
5664 l2cap_pass_to_tx(chan, control);
5665 if (control->final) {
5666 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5667
e6a3ee6e
MM		 5668 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5669 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 5670 control->final = 0;
5671 l2cap_retransmit_all(chan, control);
5672 }
5673
5674 l2cap_ertm_send(chan);
5675 } else if (control->poll) {
5676 l2cap_send_i_or_rr_or_rnr(chan);
5677 } else {
5678 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5679 &chan->conn_state) &&
5680 chan->unacked_frames)
5681 __set_retrans_timer(chan);
5682
5683 l2cap_ertm_send(chan);
5684 }
5685 break;
5686 case L2CAP_EV_RECV_RNR:
5687 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5688 l2cap_pass_to_tx(chan, control);
5689 if (control && control->poll) {
5690 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5691 l2cap_send_rr_or_rnr(chan, 0);
5692 }
5693 __clear_retrans_timer(chan);
5694 l2cap_seq_list_clear(&chan->retrans_list);
5695 break;
5696 case L2CAP_EV_RECV_REJ:
5697 l2cap_handle_rej(chan, control);
5698 break;
5699 case L2CAP_EV_RECV_SREJ:
5700 l2cap_handle_srej(chan, control);
5701 break;
5702 default:
5703 break;
5704 }
5705
5706 if (skb && !skb_in_use) {
5707 BT_DBG("Freeing %p", skb);
5708 kfree_skb(skb);
5709 }
5710
5711 return err;
5712}
5713
5714static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5715 struct l2cap_ctrl *control,
5716 struct sk_buff *skb, u8 event)
5717{
5718 int err = 0;
5719 u16 txseq = control->txseq;
5720 bool skb_in_use = 0;
5721
5722 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5723 event);
5724
5725 switch (event) {
5726 case L2CAP_EV_RECV_IFRAME:
5727 switch (l2cap_classify_txseq(chan, txseq)) {
5728 case L2CAP_TXSEQ_EXPECTED:
5729 /* Keep frame for reassembly later */
5730 l2cap_pass_to_tx(chan, control);
5731 skb_queue_tail(&chan->srej_q, skb);
5732 skb_in_use = 1;
5733 BT_DBG("Queued %p (queue len %d)", skb,
5734 skb_queue_len(&chan->srej_q));
5735
5736 chan->expected_tx_seq = __next_seq(chan, txseq);
5737 break;
5738 case L2CAP_TXSEQ_EXPECTED_SREJ:
5739 l2cap_seq_list_pop(&chan->srej_list);
5740
5741 l2cap_pass_to_tx(chan, control);
5742 skb_queue_tail(&chan->srej_q, skb);
5743 skb_in_use = 1;
5744 BT_DBG("Queued %p (queue len %d)", skb,
5745 skb_queue_len(&chan->srej_q));
5746
5747 err = l2cap_rx_queued_iframes(chan);
5748 if (err)
5749 break;
5750
5751 break;
5752 case L2CAP_TXSEQ_UNEXPECTED:
5753 /* Got a frame that can't be reassembled yet.
5754 * Save it for later, and send SREJs to cover
5755 * the missing frames.
5756 */
5757 skb_queue_tail(&chan->srej_q, skb);
5758 skb_in_use = 1;
5759 BT_DBG("Queued %p (queue len %d)", skb,
5760 skb_queue_len(&chan->srej_q));
5761
5762 l2cap_pass_to_tx(chan, control);
5763 l2cap_send_srej(chan, control->txseq);
5764 break;
5765 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5766 /* This frame was requested with an SREJ, but
5767 * some expected retransmitted frames are
5768 * missing. Request retransmission of missing
5769 * SREJ'd frames.
5770 */
5771 skb_queue_tail(&chan->srej_q, skb);
5772 skb_in_use = 1;
5773 BT_DBG("Queued %p (queue len %d)", skb,
5774 skb_queue_len(&chan->srej_q));
5775
5776 l2cap_pass_to_tx(chan, control);
5777 l2cap_send_srej_list(chan, control->txseq);
5778 break;
5779 case L2CAP_TXSEQ_DUPLICATE_SREJ:
5780 /* We've already queued this frame. Drop this copy. */
5781 l2cap_pass_to_tx(chan, control);
5782 break;
5783 case L2CAP_TXSEQ_DUPLICATE:
5784 /* Expecting a later sequence number, so this frame
5785 * was already received. Ignore it completely.
5786 */
5787 break;
5788 case L2CAP_TXSEQ_INVALID_IGNORE:
5789 break;
5790 case L2CAP_TXSEQ_INVALID:
5791 default:
5e4e3972 5792 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5793 break;
5794 }
5795 break;
5796 case L2CAP_EV_RECV_RR:
5797 l2cap_pass_to_tx(chan, control);
5798 if (control->final) {
5799 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5800
5801 if (!test_and_clear_bit(CONN_REJ_ACT,
5802 &chan->conn_state)) {
5803 control->final = 0;
5804 l2cap_retransmit_all(chan, control);
5805 }
5806
5807 l2cap_ertm_send(chan);
5808 } else if (control->poll) {
5809 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5810 &chan->conn_state) &&
5811 chan->unacked_frames) {
5812 __set_retrans_timer(chan);
5813 }
5814
5815 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5816 l2cap_send_srej_tail(chan);
5817 } else {
5818 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5819 &chan->conn_state) &&
5820 chan->unacked_frames)
5821 __set_retrans_timer(chan);
5822
5823 l2cap_send_ack(chan);
5824 }
5825 break;
5826 case L2CAP_EV_RECV_RNR:
5827 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5828 l2cap_pass_to_tx(chan, control);
5829 if (control->poll) {
5830 l2cap_send_srej_tail(chan);
5831 } else {
5832 struct l2cap_ctrl rr_control;
5833 memset(&rr_control, 0, sizeof(rr_control));
5834 rr_control.sframe = 1;
5835 rr_control.super = L2CAP_SUPER_RR;
5836 rr_control.reqseq = chan->buffer_seq;
5837 l2cap_send_sframe(chan, &rr_control);
5838 }
5839
5840 break;
5841 case L2CAP_EV_RECV_REJ:
5842 l2cap_handle_rej(chan, control);
5843 break;
5844 case L2CAP_EV_RECV_SREJ:
5845 l2cap_handle_srej(chan, control);
5846 break;
5847 }
5848
5849 if (skb && !skb_in_use) {
5850 BT_DBG("Freeing %p", skb);
5851 kfree_skb(skb);
5852 }
5853
5854 return err;
5855}
5856
32b32735
MM		 5857static int l2cap_finish_move(struct l2cap_chan *chan)
5858{
5859 BT_DBG("chan %p", chan);
5860
5861 chan->rx_state = L2CAP_RX_STATE_RECV;
5862
5863 if (chan->hs_hcon)
5864 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
5865 else
5866 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
5867
5868 return l2cap_resegment(chan);
5869}
5870
5871static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
5872 struct l2cap_ctrl *control,
5873 struct sk_buff *skb, u8 event)
5874{
5875 int err;
5876
5877 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5878 event);
5879
5880 if (!control->poll)
5881 return -EPROTO;
5882
5883 l2cap_process_reqseq(chan, control->reqseq);
5884
5885 if (!skb_queue_empty(&chan->tx_q))
5886 chan->tx_send_head = skb_peek(&chan->tx_q);
5887 else
5888 chan->tx_send_head = NULL;
5889
5890 /* Rewind next_tx_seq to the point expected
5891 * by the receiver.
5892 */
5893 chan->next_tx_seq = control->reqseq;
5894 chan->unacked_frames = 0;
5895
5896 err = l2cap_finish_move(chan);
5897 if (err)
5898 return err;
5899
5900 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5901 l2cap_send_i_or_rr_or_rnr(chan);
5902
5903 if (event == L2CAP_EV_RECV_IFRAME)
5904 return -EPROTO;
5905
5906 return l2cap_rx_state_recv(chan, control, NULL, event);
5907}
5908
5909static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
5910 struct l2cap_ctrl *control,
5911 struct sk_buff *skb, u8 event)
5912{
5913 int err;
5914
5915 if (!control->final)
5916 return -EPROTO;
5917
5918 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5919
5920 chan->rx_state = L2CAP_RX_STATE_RECV;
5921 l2cap_process_reqseq(chan, control->reqseq);
5922
5923 if (!skb_queue_empty(&chan->tx_q))
5924 chan->tx_send_head = skb_peek(&chan->tx_q);
5925 else
5926 chan->tx_send_head = NULL;
5927
5928 /* Rewind next_tx_seq to the point expected
5929 * by the receiver.
5930 */
5931 chan->next_tx_seq = control->reqseq;
5932 chan->unacked_frames = 0;
5933
5934 if (chan->hs_hcon)
5935 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
5936 else
5937 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
5938
5939 err = l2cap_resegment(chan);
5940
5941 if (!err)
5942 err = l2cap_rx_state_recv(chan, control, skb, event);
5943
5944 return err;
5945}
5946
d2a7ac5d
MM		 5947static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
5948{
5949 /* Make sure reqseq is for a packet that has been sent but not acked */
5950 u16 unacked;
5951
5952 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
5953 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
5954}
5955
cec8ab6e
MM		 5956static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5957 struct sk_buff *skb, u8 event)
218bb9df 5958{
d2a7ac5d
MM		 5959 int err = 0;
5960
5961 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
5962 control, skb, event, chan->rx_state);
5963
5964 if (__valid_reqseq(chan, control->reqseq)) {
5965 switch (chan->rx_state) {
5966 case L2CAP_RX_STATE_RECV:
5967 err = l2cap_rx_state_recv(chan, control, skb, event);
5968 break;
5969 case L2CAP_RX_STATE_SREJ_SENT:
5970 err = l2cap_rx_state_srej_sent(chan, control, skb,
5971 event);
5972 break;
32b32735
MM		 5973 case L2CAP_RX_STATE_WAIT_P:
5974 err = l2cap_rx_state_wait_p(chan, control, skb, event);
5975 break;
5976 case L2CAP_RX_STATE_WAIT_F:
5977 err = l2cap_rx_state_wait_f(chan, control, skb, event);
5978 break;
d2a7ac5d
MM		 5979 default:
5980 /* shut it down */
5981 break;
5982 }
5983 } else {
5984 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
5985 control->reqseq, chan->next_tx_seq,
5986 chan->expected_ack_seq);
5e4e3972 5987 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5988 }
5989
5990 return err;
cec8ab6e
MM		 5991}
5992
5993static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5994 struct sk_buff *skb)
5995{
4b51dae9
MM		 5996 int err = 0;
5997
5998 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
5999 chan->rx_state);
6000
6001 if (l2cap_classify_txseq(chan, control->txseq) ==
6002 L2CAP_TXSEQ_EXPECTED) {
6003 l2cap_pass_to_tx(chan, control);
6004
6005 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6006 __next_seq(chan, chan->buffer_seq));
6007
6008 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6009
6010 l2cap_reassemble_sdu(chan, skb, control);
6011 } else {
6012 if (chan->sdu) {
6013 kfree_skb(chan->sdu);
6014 chan->sdu = NULL;
6015 }
6016 chan->sdu_last_frag = NULL;
6017 chan->sdu_len = 0;
6018
6019 if (skb) {
6020 BT_DBG("Freeing %p", skb);
6021 kfree_skb(skb);
6022 }
6023 }
6024
6025 chan->last_acked_seq = control->txseq;
6026 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6027
6028 return err;
cec8ab6e
MM		 6029}
6030
6031static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6032{
6033 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6034 u16 len;
6035 u8 event;
218bb9df 6036
b76bbd66
MM		 6037 __unpack_control(chan, skb);
6038
218bb9df
GP		 6039 len = skb->len;
6040
6041 /*
6042 * We can just drop the corrupted I-frame here.
6043 * Receiver will miss it and start proper recovery
cec8ab6e 6044 * procedures and ask for retransmission.
218bb9df 6045 */
47d1ec61 6046 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6047 goto drop;
6048
cec8ab6e 6049 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6050 len -= L2CAP_SDULEN_SIZE;
218bb9df 6051
47d1ec61 6052 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6053 len -= L2CAP_FCS_SIZE;
218bb9df 6054
47d1ec61 6055 if (len > chan->mps) {
5e4e3972 6056 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6057 goto drop;
6058 }
6059
cec8ab6e
MM		 6060 if (!control->sframe) {
6061 int err;
218bb9df 6062
cec8ab6e
MM		 6063 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6064 control->sar, control->reqseq, control->final,
6065 control->txseq);
218bb9df 6066
cec8ab6e
MM		 6067 /* Validate F-bit - F=0 always valid, F=1 only
6068 * valid in TX WAIT_F
6069 */
6070 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6071 goto drop;
cec8ab6e
MM		 6072
6073 if (chan->mode != L2CAP_MODE_STREAMING) {
6074 event = L2CAP_EV_RECV_IFRAME;
6075 err = l2cap_rx(chan, control, skb, event);
6076 } else {
6077 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6078 }
6079
cec8ab6e 6080 if (err)
5e4e3972 6081 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6082 } else {
cec8ab6e
MM		 6083 const u8 rx_func_to_event[4] = {
6084 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6085 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6086 };
6087
6088 /* Only I-frames are expected in streaming mode */
6089 if (chan->mode == L2CAP_MODE_STREAMING)
6090 goto drop;
6091
6092 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6093 control->reqseq, control->final, control->poll,
6094 control->super);
6095
218bb9df 6096 if (len != 0) {
1bb166e6 6097 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6098 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6099 goto drop;
6100 }
6101
cec8ab6e
MM		 6102 /* Validate F and P bits */
6103 if (control->final && (control->poll ||
6104 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6105 goto drop;
6106
6107 event = rx_func_to_event[control->super];
6108 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6109 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6110 }
6111
6112 return 0;
6113
6114drop:
6115 kfree_skb(skb);
6116 return 0;
6117}
6118
13ca56e0
AE		 6119static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6120 struct sk_buff *skb)
1da177e4 6121{
48454079 6122 struct l2cap_chan *chan;
1da177e4 6123
baa7e1fa 6124 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6125 if (!chan) {
97e8e89d
AE		 6126 if (cid == L2CAP_CID_A2MP) {
6127 chan = a2mp_channel_create(conn, skb);
6128 if (!chan) {
6129 kfree_skb(skb);
13ca56e0 6130 return;
97e8e89d
AE		 6131 }
6132
6133 l2cap_chan_lock(chan);
6134 } else {
6135 BT_DBG("unknown cid 0x%4.4x", cid);
6136 /* Drop packet and return */
6137 kfree_skb(skb);
13ca56e0 6138 return;
97e8e89d 6139 }
1da177e4
LT		 6140 }
6141
49208c9c 6142 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6143
89bc500e 6144 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6145 goto drop;
6146
0c1bc5c6 6147 switch (chan->mode) {
1c2acffb
GP		 6148 case L2CAP_MODE_BASIC:
6149 /* If socket recv buffers overflows we drop data here
6150 * which is *bad* because L2CAP has to be reliable.
6151 * But we don't have any other choice. L2CAP doesn't
6152 * provide flow control mechanism. */
1da177e4 6153
0c1bc5c6 6154 if (chan->imtu < skb->len)
1c2acffb 6155 goto drop;
1da177e4 6156
80b98027 6157 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6158 goto done;
6159 break;
6160
6161 case L2CAP_MODE_ERTM:
6840ed07 6162 case L2CAP_MODE_STREAMING:
cec8ab6e 6163 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6164 goto done;
6165
1c2acffb 6166 default:
0c1bc5c6 6167 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6168 break;
6169 }
1da177e4
LT		 6170
6171drop:
6172 kfree_skb(skb);
6173
6174done:
6be36555 6175 l2cap_chan_unlock(chan);
1da177e4
LT		 6176}
6177
84104b24
AE		 6178static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6179 struct sk_buff *skb)
1da177e4 6180{
23691d75 6181 struct l2cap_chan *chan;
1da177e4 6182
c2287681 6183 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 6184 if (!chan)
1da177e4
LT		 6185 goto drop;
6186
5b4cedaa 6187 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6188
89bc500e 6189 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6190 goto drop;
6191
e13e21dc 6192 if (chan->imtu < skb->len)
1da177e4
LT		 6193 goto drop;
6194
80b98027 6195 if (!chan->ops->recv(chan, skb))
84104b24 6196 return;
1da177e4
LT		 6197
6198drop:
6199 kfree_skb(skb);
1da177e4
LT		 6200}
6201
6810fca7
AE		 6202static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid,
6203 struct sk_buff *skb)
9f69bda6 6204{
23691d75 6205 struct l2cap_chan *chan;
9f69bda6 6206
c2287681 6207 chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst);
23691d75 6208 if (!chan)
9f69bda6
GP		 6209 goto drop;
6210
5b4cedaa 6211 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6212
89bc500e 6213 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 6214 goto drop;
6215
e13e21dc 6216 if (chan->imtu < skb->len)
9f69bda6
GP		 6217 goto drop;
6218
80b98027 6219 if (!chan->ops->recv(chan, skb))
6810fca7 6220 return;
9f69bda6
GP		 6221
6222drop:
6223 kfree_skb(skb);
9f69bda6
GP		 6224}
6225
1da177e4
LT		 6226static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6227{
6228 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 6229 u16 cid, len;
6230 __le16 psm;
1da177e4
LT		 6231
6232 skb_pull(skb, L2CAP_HDR_SIZE);
6233 cid = __le16_to_cpu(lh->cid);
6234 len = __le16_to_cpu(lh->len);
6235
1c2acffb
GP		 6236 if (len != skb->len) {
6237 kfree_skb(skb);
6238 return;
6239 }
6240
1da177e4
LT		 6241 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6242
6243 switch (cid) {
3300d9a9 6244 case L2CAP_CID_LE_SIGNALING:
8db4dc46 6245 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6246 l2cap_sig_channel(conn, skb);
6247 break;
6248
8db4dc46 6249 case L2CAP_CID_CONN_LESS:
097db76c 6250 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6251 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6252 l2cap_conless_channel(conn, psm, skb);
6253 break;
6254
9f69bda6
GP		 6255 case L2CAP_CID_LE_DATA:
6256 l2cap_att_channel(conn, cid, skb);
6257 break;
6258
b501d6a1
AB		 6259 case L2CAP_CID_SMP:
6260 if (smp_sig_channel(conn, skb))
6261 l2cap_conn_del(conn->hcon, EACCES);
6262 break;
6263
1da177e4
LT		 6264 default:
6265 l2cap_data_channel(conn, cid, skb);
6266 break;
6267 }
6268}
6269
6270/* ---- L2CAP interface with lower layer (HCI) ---- */
6271
686ebf28 6272int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 6273{
6274 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 6275 struct l2cap_chan *c;
1da177e4 6276
6ed93dc6 6277 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 6278
6279 /* Find listening sockets and check their link_mode */
23691d75
GP		 6280 read_lock(&chan_list_lock);
6281 list_for_each_entry(c, &chan_list, global_l) {
6282 struct sock *sk = c->sk;
4343478f 6283
89bc500e 6284 if (c->state != BT_LISTEN)
1da177e4
LT		 6285 continue;
6286
6287 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 6288 lm1 |= HCI_LM_ACCEPT;
43bd0f32 6289 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 6290 lm1 |= HCI_LM_MASTER;
1da177e4 6291 exact++;
2af6b9d5
MH		 6292 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
6293 lm2 |= HCI_LM_ACCEPT;
43bd0f32 6294 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 6295 lm2 |= HCI_LM_MASTER;
6296 }
1da177e4 6297 }
23691d75 6298 read_unlock(&chan_list_lock);
1da177e4
LT		 6299
6300 return exact ? lm1 : lm2;
6301}
6302
9e664631 6303void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 6304{
0139418c
MH		 6305 struct l2cap_conn *conn;
6306
6ed93dc6 6307 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 6308
1da177e4 6309 if (!status) {
1da177e4
LT		 6310 conn = l2cap_conn_add(hcon, status);
6311 if (conn)
6312 l2cap_conn_ready(conn);
ba6fc317 6313 } else {
e175072f 6314 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 6315 }
1da177e4
LT		 6316}
6317
686ebf28 6318int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 6319{
6320 struct l2cap_conn *conn = hcon->l2cap_data;
6321
6322 BT_DBG("hcon %p", hcon);
6323
686ebf28 6324 if (!conn)
9f5a0d7b 6325 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 6326 return conn->disc_reason;
6327}
6328
9e664631 6329void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 6330{
6331 BT_DBG("hcon %p reason %d", hcon, reason);
6332
e175072f 6333 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 6334}
6335
4343478f 6336static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 6337{
715ec005 6338 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 6339 return;
6340
f62e4323 6341 if (encrypt == 0x00) {
4343478f 6342 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 6343 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 6344 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 6345 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 6346 } else {
4343478f 6347 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 6348 __clear_chan_timer(chan);
f62e4323
MH		 6349 }
6350}
6351
686ebf28 6352int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 6353{
0139418c 6354 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 6355 struct l2cap_chan *chan;
1da177e4 6356
0139418c 6357 if (!conn)
1da177e4 6358 return 0;
0139418c 6359
89d8b407 6360 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 6361
160dc6ac 6362 if (hcon->type == LE_LINK) {
35d4adcc
HG		 6363 if (!status && encrypt)
6364 smp_distribute_keys(conn, 0);
17cd3f37 6365 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 6366 }
6367
3df91ea2 6368 mutex_lock(&conn->chan_lock);
1da177e4 6369
3df91ea2 6370 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 6371 l2cap_chan_lock(chan);
1da177e4 6372
89d8b407
AE		 6373 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6374 state_to_string(chan->state));
f1cb9af5 6375
78eb2f98
AE		 6376 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6377 l2cap_chan_unlock(chan);
6378 continue;
6379 }
6380
f1cb9af5
VCG		 6381 if (chan->scid == L2CAP_CID_LE_DATA) {
6382 if (!status && encrypt) {
6383 chan->sec_level = hcon->sec_level;
cf4cd009 6384 l2cap_chan_ready(chan);
f1cb9af5
VCG		 6385 }
6386
6be36555 6387 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 6388 continue;
6389 }
6390
96eff46e 6391 if (!__l2cap_no_conn_pending(chan)) {
6be36555 6392 l2cap_chan_unlock(chan);
6a8d3010
MH		 6393 continue;
6394 }
6395
89bc500e 6396 if (!status && (chan->state == BT_CONNECTED ||
2d792818 6397 chan->state == BT_CONFIG)) {
a7d7723a
GP		 6398 struct sock *sk = chan->sk;
6399
c5daa683 6400 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
a7d7723a
GP		 6401 sk->sk_state_change(sk);
6402
4343478f 6403 l2cap_check_encryption(chan, encrypt);
6be36555 6404 l2cap_chan_unlock(chan);
9719f8af
MH		 6405 continue;
6406 }
6407
89bc500e 6408 if (chan->state == BT_CONNECT) {
b1235d79 6409 if (!status) {
93c3e8f5 6410 l2cap_start_connection(chan);
b1235d79 6411 } else {
ba13ccd9 6412 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 6413 }
89bc500e 6414 } else if (chan->state == BT_CONNECT2) {
6be36555 6415 struct sock *sk = chan->sk;
b1235d79 6416 struct l2cap_conn_rsp rsp;
df3c3931 6417 __u16 res, stat;
1da177e4 6418
6be36555
AE		 6419 lock_sock(sk);
6420
b1235d79 6421 if (!status) {
c5daa683
GP		 6422 if (test_bit(BT_SK_DEFER_SETUP,
6423 &bt_sk(sk)->flags)) {
df3c3931
JH		 6424 res = L2CAP_CR_PEND;
6425 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 6426 chan->ops->defer(chan);
df3c3931 6427 } else {
0e587be7 6428 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 6429 res = L2CAP_CR_SUCCESS;
6430 stat = L2CAP_CS_NO_INFO;
6431 }
b1235d79 6432 } else {
0e587be7 6433 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 6434 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 6435 res = L2CAP_CR_SEC_BLOCK;
6436 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 6437 }
6438
6be36555
AE		 6439 release_sock(sk);
6440
fe4128e0
GP		 6441 rsp.scid = cpu_to_le16(chan->dcid);
6442 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 6443 rsp.result = cpu_to_le16(res);
6444 rsp.status = cpu_to_le16(stat);
fc7f8a7e 6445 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 6446 sizeof(rsp), &rsp);
2d369359
MM		 6447
6448 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6449 res == L2CAP_CR_SUCCESS) {
6450 char buf[128];
6451 set_bit(CONF_REQ_SENT, &chan->conf_state);
6452 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6453 L2CAP_CONF_REQ,
6454 l2cap_build_conf_req(chan, buf),
6455 buf);
6456 chan->num_conf_req++;
6457 }
b1235d79 6458 }
1da177e4 6459
6be36555 6460 l2cap_chan_unlock(chan);
1da177e4
LT		 6461 }
6462
3df91ea2 6463 mutex_unlock(&conn->chan_lock);
b1235d79 6464
1da177e4
LT		 6465 return 0;
6466}
6467
686ebf28 6468int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 6469{
6470 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 6471 struct l2cap_hdr *hdr;
6472 int len;
1da177e4 6473
1d13a254
AE		 6474 /* For AMP controller do not create l2cap conn */
6475 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6476 goto drop;
1da177e4 6477
5a08ecce
AE		 6478 if (!conn)
6479 conn = l2cap_conn_add(hcon, 0);
6480
6481 if (!conn)
1da177e4
LT		 6482 goto drop;
6483
6484 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6485
d73a0988
AE		 6486 switch (flags) {
6487 case ACL_START:
6488 case ACL_START_NO_FLUSH:
6489 case ACL_COMPLETE:
1da177e4
LT		 6490 if (conn->rx_len) {
6491 BT_ERR("Unexpected start frame (len %d)", skb->len);
6492 kfree_skb(conn->rx_skb);
6493 conn->rx_skb = NULL;
6494 conn->rx_len = 0;
6495 l2cap_conn_unreliable(conn, ECOMM);
6496 }
6497
aae7fe22
AE		 6498 /* Start fragment always begin with Basic L2CAP header */
6499 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 6500 BT_ERR("Frame is too short (len %d)", skb->len);
6501 l2cap_conn_unreliable(conn, ECOMM);
6502 goto drop;
6503 }
6504
6505 hdr = (struct l2cap_hdr *) skb->data;
6506 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6507
6508 if (len == skb->len) {
6509 /* Complete frame received */
6510 l2cap_recv_frame(conn, skb);
6511 return 0;
6512 }
6513
6514 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6515
6516 if (skb->len > len) {
6517 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 6518 skb->len, len);
1da177e4
LT		 6519 l2cap_conn_unreliable(conn, ECOMM);
6520 goto drop;
6521 }
6522
6523 /* Allocate skb for the complete frame (with header) */
8bcde1f2 6524 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 6525 if (!conn->rx_skb)
1da177e4
LT		 6526 goto drop;
6527
d626f62b 6528 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6529 skb->len);
1da177e4 6530 conn->rx_len = len - skb->len;
d73a0988
AE		 6531 break;
6532
6533 case ACL_CONT:
1da177e4
LT		 6534 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6535
6536 if (!conn->rx_len) {
6537 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6538 l2cap_conn_unreliable(conn, ECOMM);
6539 goto drop;
6540 }
6541
6542 if (skb->len > conn->rx_len) {
6543 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 6544 skb->len, conn->rx_len);
1da177e4
LT		 6545 kfree_skb(conn->rx_skb);
6546 conn->rx_skb = NULL;
6547 conn->rx_len = 0;
6548 l2cap_conn_unreliable(conn, ECOMM);
6549 goto drop;
6550 }
6551
d626f62b 6552 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6553 skb->len);
1da177e4
LT		 6554 conn->rx_len -= skb->len;
6555
6556 if (!conn->rx_len) {
6557 /* Complete frame received */
6558 l2cap_recv_frame(conn, conn->rx_skb);
6559 conn->rx_skb = NULL;
6560 }
d73a0988 6561 break;
1da177e4
LT		 6562 }
6563
6564drop:
6565 kfree_skb(skb);
6566 return 0;
6567}
6568
aef7d97c 6569static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 6570{
23691d75 6571 struct l2cap_chan *c;
1da177e4 6572
333055f2 6573 read_lock(&chan_list_lock);
1da177e4 6574
23691d75
GP		 6575 list_for_each_entry(c, &chan_list, global_l) {
6576 struct sock *sk = c->sk;
101545f6 6577
fcb73338
AE		 6578 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
6579 &bt_sk(sk)->src, &bt_sk(sk)->dst,
6580 c->state, __le16_to_cpu(c->psm),
6581 c->scid, c->dcid, c->imtu, c->omtu,
6582 c->sec_level, c->mode);
61e1b4b7 6583 }
1da177e4 6584
333055f2 6585 read_unlock(&chan_list_lock);
1da177e4 6586
aef7d97c 6587 return 0;
1da177e4
LT		 6588}
6589
aef7d97c
MH		 6590static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6591{
6592 return single_open(file, l2cap_debugfs_show, inode->i_private);
6593}
6594
6595static const struct file_operations l2cap_debugfs_fops = {
6596 .open = l2cap_debugfs_open,
6597 .read = seq_read,
6598 .llseek = seq_lseek,
6599 .release = single_release,
6600};
6601
6602static struct dentry *l2cap_debugfs;
1da177e4 6603
64274518 6604int __init l2cap_init(void)
1da177e4
LT		 6605{
6606 int err;
be9d1227 6607
bb58f747 6608 err = l2cap_init_sockets();
1da177e4
LT		 6609 if (err < 0)
6610 return err;
6611
aef7d97c 6612 if (bt_debugfs) {
2d792818
GP		 6613 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6614 NULL, &l2cap_debugfs_fops);
aef7d97c
MH		 6615 if (!l2cap_debugfs)
6616 BT_ERR("Failed to create L2CAP debug file");
6617 }
1da177e4 6618
1da177e4 6619 return 0;
1da177e4
LT		 6620}
6621
64274518 6622void l2cap_exit(void)
1da177e4 6623{
aef7d97c 6624 debugfs_remove(l2cap_debugfs);
bb58f747 6625 l2cap_cleanup_sockets();
1da177e4
LT		 6626}
6627
d1c4a17d
GP		 6628module_param(disable_ertm, bool, 0644);
6629MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)