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Bluetooth: Fix double error response for l2cap_create_chan_req
[linux-2.6-block.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;
9f22398c
JH		 507 if (chan->dcid == L2CAP_CID_ATT)
508 chan->scid = L2CAP_CID_ATT;
509 else
510 chan->scid = l2cap_alloc_cid(conn);
b62f328b
VT		 511 } else {
512 /* Alloc CID for connection-oriented socket */
fe4128e0 513 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 514 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 515 }
5491120e
AE		 516 break;
517
518 case L2CAP_CHAN_CONN_LESS:
0139418c 519 /* Connectionless socket */
fe4128e0
GP		 520 chan->scid = L2CAP_CID_CONN_LESS;
521 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 522 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 523 break;
524
416fa752
AE		 525 case L2CAP_CHAN_CONN_FIX_A2MP:
526 chan->scid = L2CAP_CID_A2MP;
527 chan->dcid = L2CAP_CID_A2MP;
528 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
529 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
530 break;
531
5491120e 532 default:
0139418c 533 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 534 chan->scid = L2CAP_CID_SIGNALING;
535 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 536 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 537 }
538
8f7975b1
AE		 539 chan->local_id = L2CAP_BESTEFFORT_ID;
540 chan->local_stype = L2CAP_SERV_BESTEFFORT;
541 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
542 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
543 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 544 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 545
371fd835 546 l2cap_chan_hold(chan);
baa7e1fa 547
5ee9891d
JH		 548 hci_conn_hold(conn->hcon);
549
3df91ea2 550 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 551}
552
466f8004 553void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 554{
555 mutex_lock(&conn->chan_lock);
556 __l2cap_chan_add(conn, chan);
3df91ea2 557 mutex_unlock(&conn->chan_lock);
0139418c
MH		 558}
559
466f8004 560void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 561{
8c1d787b 562 struct l2cap_conn *conn = chan->conn;
0139418c 563
c9b66675 564 __clear_chan_timer(chan);
0139418c 565
49208c9c 566 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 567
8e87d142 568 if (conn) {
56f60984 569 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 570 /* Delete from channel list */
3df91ea2 571 list_del(&chan->list);
3d57dc68 572
371fd835 573 l2cap_chan_put(chan);
baa7e1fa 574
8c1d787b 575 chan->conn = NULL;
3cabbfda
AE		 576
577 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
76a68ba0 578 hci_conn_drop(conn->hcon);
56f60984
AE		 579
580 if (mgr && mgr->bredr_chan == chan)
581 mgr->bredr_chan = NULL;
0139418c
MH		 582 }
583
419e08c1
AE		 584 if (chan->hs_hchan) {
585 struct hci_chan *hs_hchan = chan->hs_hchan;
586
587 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
588 amp_disconnect_logical_link(hs_hchan);
589 }
590
b699ec0d 591 chan->ops->teardown(chan, err);
6be36555 592
2827011f 593 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 594 return;
2ead70b8 595
ee556f66
GP		 596 switch(chan->mode) {
597 case L2CAP_MODE_BASIC:
598 break;
c13ffa62 599
ee556f66 600 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 601 __clear_retrans_timer(chan);
602 __clear_monitor_timer(chan);
603 __clear_ack_timer(chan);
c13ffa62 604
f1c6775b 605 skb_queue_purge(&chan->srej_q);
c13ffa62 606
3c588192
MM		 607 l2cap_seq_list_free(&chan->srej_list);
608 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 609
610 /* fall through */
611
612 case L2CAP_MODE_STREAMING:
613 skb_queue_purge(&chan->tx_q);
614 break;
c13ffa62 615 }
ee556f66
GP		 616
617 return;
0139418c
MH		 618}
619
0f852724 620void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 621{
622 struct l2cap_conn *conn = chan->conn;
623 struct sock *sk = chan->sk;
624
2d792818
GP		 625 BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state),
626 sk);
4519de9a 627
89bc500e 628 switch (chan->state) {
4519de9a 629 case BT_LISTEN:
b699ec0d 630 chan->ops->teardown(chan, 0);
4519de9a
GP		 631 break;
632
633 case BT_CONNECTED:
634 case BT_CONFIG:
715ec005 635 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 636 conn->hcon->type == ACL_LINK) {
c9b66675 637 __set_chan_timer(chan, sk->sk_sndtimeo);
5e4e3972 638 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 639 } else
640 l2cap_chan_del(chan, reason);
641 break;
642
643 case BT_CONNECT2:
715ec005 644 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 645 conn->hcon->type == ACL_LINK) {
4519de9a
GP		 646 struct l2cap_conn_rsp rsp;
647 __u16 result;
648
c5daa683 649 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
4519de9a
GP		 650 result = L2CAP_CR_SEC_BLOCK;
651 else
652 result = L2CAP_CR_BAD_PSM;
89bc500e 653 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 654
655 rsp.scid = cpu_to_le16(chan->dcid);
656 rsp.dcid = cpu_to_le16(chan->scid);
657 rsp.result = cpu_to_le16(result);
ac73498c 658 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4519de9a 659 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 660 sizeof(rsp), &rsp);
4519de9a
GP		 661 }
662
663 l2cap_chan_del(chan, reason);
664 break;
665
666 case BT_CONNECT:
667 case BT_DISCONN:
668 l2cap_chan_del(chan, reason);
669 break;
670
671 default:
b699ec0d 672 chan->ops->teardown(chan, 0);
4519de9a
GP		 673 break;
674 }
675}
676
4343478f 677static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 678{
715ec005 679 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 680 switch (chan->sec_level) {
8556edd3
JH		 681 case BT_SECURITY_HIGH:
682 return HCI_AT_DEDICATED_BONDING_MITM;
683 case BT_SECURITY_MEDIUM:
684 return HCI_AT_DEDICATED_BONDING;
685 default:
686 return HCI_AT_NO_BONDING;
687 }
2983fd68 688 } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
4343478f
GP		 689 if (chan->sec_level == BT_SECURITY_LOW)
690 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 691
4343478f 692 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 693 return HCI_AT_NO_BONDING_MITM;
00ae4af9 694 else
8556edd3 695 return HCI_AT_NO_BONDING;
00ae4af9 696 } else {
4343478f 697 switch (chan->sec_level) {
00ae4af9 698 case BT_SECURITY_HIGH:
8556edd3 699 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 700 case BT_SECURITY_MEDIUM:
8556edd3 701 return HCI_AT_GENERAL_BONDING;
00ae4af9 702 default:
8556edd3 703 return HCI_AT_NO_BONDING;
00ae4af9 704 }
0684e5f9 705 }
8556edd3
JH		 706}
707
708/* Service level security */
d45fc423 709int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 710{
8c1d787b 711 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 712 __u8 auth_type;
713
4343478f 714 auth_type = l2cap_get_auth_type(chan);
79d554a6 715
4343478f 716 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 717}
718
b5ad8b7f 719static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 720{
721 u8 id;
722
723 /* Get next available identificator.
724 * 1 - 128 are used by kernel.
725 * 129 - 199 are reserved.
726 * 200 - 254 are used by utilities like l2ping, etc.
727 */
728
333055f2 729 spin_lock(&conn->lock);
4e8402a3
MH		 730
731 if (++conn->tx_ident > 128)
732 conn->tx_ident = 1;
733
734 id = conn->tx_ident;
735
333055f2 736 spin_unlock(&conn->lock);
4e8402a3
MH		 737
738 return id;
739}
740
2d792818
GP		 741static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
742 void *data)
4e8402a3
MH		 743{
744 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 745 u8 flags;
4e8402a3
MH		 746
747 BT_DBG("code 0x%2.2x", code);
748
749 if (!skb)
9a9c6a34 750 return;
4e8402a3 751
e702112f
AE		 752 if (lmp_no_flush_capable(conn->hcon->hdev))
753 flags = ACL_START_NO_FLUSH;
754 else
755 flags = ACL_START;
756
14b12d0b 757 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 758 skb->priority = HCI_PRIO_MAX;
14b12d0b 759
73d80deb
LAD		 760 hci_send_acl(conn->hchan, skb, flags);
761}
762
02b0fbb9
MM		 763static bool __chan_is_moving(struct l2cap_chan *chan)
764{
765 return chan->move_state != L2CAP_MOVE_STABLE &&
766 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
767}
768
73d80deb
LAD		 769static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
770{
771 struct hci_conn *hcon = chan->conn->hcon;
772 u16 flags;
773
774 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 775 skb->priority);
73d80deb 776
d5f8a75d
MM		 777 if (chan->hs_hcon && !__chan_is_moving(chan)) {
778 if (chan->hs_hchan)
779 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
780 else
781 kfree_skb(skb);
782
783 return;
784 }
785
73d80deb 786 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 787 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 788 flags = ACL_START_NO_FLUSH;
789 else
790 flags = ACL_START;
14b12d0b 791
73d80deb
LAD		 792 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
793 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 794}
795
b76bbd66
MM		 796static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
797{
798 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
799 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
800
801 if (enh & L2CAP_CTRL_FRAME_TYPE) {
802 /* S-Frame */
803 control->sframe = 1;
804 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
805 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
806
807 control->sar = 0;
808 control->txseq = 0;
809 } else {
810 /* I-Frame */
811 control->sframe = 0;
812 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
813 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
814
815 control->poll = 0;
816 control->super = 0;
817 }
818}
819
b76bbd66
MM		 820static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
821{
822 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
823 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
824
825 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
826 /* S-Frame */
827 control->sframe = 1;
828 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
829 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
830
831 control->sar = 0;
832 control->txseq = 0;
833 } else {
834 /* I-Frame */
835 control->sframe = 0;
836 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
837 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
838
839 control->poll = 0;
840 control->super = 0;
841 }
842}
843
844static inline void __unpack_control(struct l2cap_chan *chan,
845 struct sk_buff *skb)
846{
847 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
848 __unpack_extended_control(get_unaligned_le32(skb->data),
849 &bt_cb(skb)->control);
cec8ab6e 850 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 851 } else {
852 __unpack_enhanced_control(get_unaligned_le16(skb->data),
853 &bt_cb(skb)->control);
cec8ab6e 854 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 855 }
856}
857
b5c6aaed
MM		 858static u32 __pack_extended_control(struct l2cap_ctrl *control)
859{
860 u32 packed;
861
862 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
863 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
864
865 if (control->sframe) {
866 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
867 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
868 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
869 } else {
870 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
871 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
872 }
873
874 return packed;
875}
876
877static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
878{
879 u16 packed;
880
881 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
882 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
883
884 if (control->sframe) {
885 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
886 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
887 packed |= L2CAP_CTRL_FRAME_TYPE;
888 } else {
889 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
890 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
891 }
892
893 return packed;
894}
895
b76bbd66
MM		 896static inline void __pack_control(struct l2cap_chan *chan,
897 struct l2cap_ctrl *control,
898 struct sk_buff *skb)
899{
900 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
901 put_unaligned_le32(__pack_extended_control(control),
902 skb->data + L2CAP_HDR_SIZE);
903 } else {
904 put_unaligned_le16(__pack_enhanced_control(control),
905 skb->data + L2CAP_HDR_SIZE);
906 }
907}
908
ba7aa64f
GP		 909static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
910{
911 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
912 return L2CAP_EXT_HDR_SIZE;
913 else
914 return L2CAP_ENH_HDR_SIZE;
915}
916
a67d7f6f
MM		 917static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
918 u32 control)
b5c6aaed
MM		 919{
920 struct sk_buff *skb;
921 struct l2cap_hdr *lh;
ba7aa64f 922 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 923
924 if (chan->fcs == L2CAP_FCS_CRC16)
925 hlen += L2CAP_FCS_SIZE;
926
a67d7f6f 927 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 928
b5c6aaed 929 if (!skb)
a67d7f6f 930 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 931
932 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
933 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
934 lh->cid = cpu_to_le16(chan->dcid);
935
a67d7f6f
MM		 936 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
937 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
938 else
939 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 940
941 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 942 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 943 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
944 }
945
946 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 947 return skb;
948}
949
950static void l2cap_send_sframe(struct l2cap_chan *chan,
951 struct l2cap_ctrl *control)
952{
953 struct sk_buff *skb;
954 u32 control_field;
955
956 BT_DBG("chan %p, control %p", chan, control);
957
958 if (!control->sframe)
959 return;
960
b99e13ad
MM		 961 if (__chan_is_moving(chan))
962 return;
963
a67d7f6f
MM		 964 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
965 !control->poll)
966 control->final = 1;
967
968 if (control->super == L2CAP_SUPER_RR)
969 clear_bit(CONN_RNR_SENT, &chan->conn_state);
970 else if (control->super == L2CAP_SUPER_RNR)
971 set_bit(CONN_RNR_SENT, &chan->conn_state);
972
973 if (control->super != L2CAP_SUPER_SREJ) {
974 chan->last_acked_seq = control->reqseq;
975 __clear_ack_timer(chan);
976 }
977
978 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
979 control->final, control->poll, control->super);
980
981 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
982 control_field = __pack_extended_control(control);
983 else
984 control_field = __pack_enhanced_control(control);
985
986 skb = l2cap_create_sframe_pdu(chan, control_field);
987 if (!IS_ERR(skb))
988 l2cap_do_send(chan, skb);
b5c6aaed
MM		 989}
990
c9e3d5e0 991static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 992{
c9e3d5e0
MM		 993 struct l2cap_ctrl control;
994
995 BT_DBG("chan %p, poll %d", chan, poll);
996
997 memset(&control, 0, sizeof(control));
998 control.sframe = 1;
999 control.poll = poll;
1000
1001 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1002 control.super = L2CAP_SUPER_RNR;
1003 else
1004 control.super = L2CAP_SUPER_RR;
b5c6aaed 1005
c9e3d5e0
MM		 1006 control.reqseq = chan->buffer_seq;
1007 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1008}
1009
b4450035 1010static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1011{
c1360a1c 1012 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1013}
1014
93c3e8f5
AE		 1015static bool __amp_capable(struct l2cap_chan *chan)
1016{
1017 struct l2cap_conn *conn = chan->conn;
1018
1019 if (enable_hs &&
5d05416e 1020 hci_amp_capable() &&
93c3e8f5
AE		 1021 chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED &&
1022 conn->fixed_chan_mask & L2CAP_FC_A2MP)
1023 return true;
1024 else
1025 return false;
1026}
1027
5ce66b59
AE		 1028static bool l2cap_check_efs(struct l2cap_chan *chan)
1029{
1030 /* Check EFS parameters */
1031 return true;
1032}
1033
2766be48 1034void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1035{
1036 struct l2cap_conn *conn = chan->conn;
1037 struct l2cap_conn_req req;
1038
1039 req.scid = cpu_to_le16(chan->scid);
1040 req.psm = chan->psm;
1041
1042 chan->ident = l2cap_get_ident(conn);
1043
1044 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1045
1046 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1047}
1048
8eb200bd
MM		 1049static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1050{
1051 struct l2cap_create_chan_req req;
1052 req.scid = cpu_to_le16(chan->scid);
1053 req.psm = chan->psm;
1054 req.amp_id = amp_id;
1055
1056 chan->ident = l2cap_get_ident(chan->conn);
1057
1058 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1059 sizeof(req), &req);
1060}
1061
02b0fbb9
MM		 1062static void l2cap_move_setup(struct l2cap_chan *chan)
1063{
1064 struct sk_buff *skb;
1065
1066 BT_DBG("chan %p", chan);
1067
1068 if (chan->mode != L2CAP_MODE_ERTM)
1069 return;
1070
1071 __clear_retrans_timer(chan);
1072 __clear_monitor_timer(chan);
1073 __clear_ack_timer(chan);
1074
1075 chan->retry_count = 0;
1076 skb_queue_walk(&chan->tx_q, skb) {
1077 if (bt_cb(skb)->control.retries)
1078 bt_cb(skb)->control.retries = 1;
1079 else
1080 break;
1081 }
1082
1083 chan->expected_tx_seq = chan->buffer_seq;
1084
1085 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1086 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1087 l2cap_seq_list_clear(&chan->retrans_list);
1088 l2cap_seq_list_clear(&chan->srej_list);
1089 skb_queue_purge(&chan->srej_q);
1090
1091 chan->tx_state = L2CAP_TX_STATE_XMIT;
1092 chan->rx_state = L2CAP_RX_STATE_MOVE;
1093
1094 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1095}
1096
5f3847a4
MM		 1097static void l2cap_move_done(struct l2cap_chan *chan)
1098{
1099 u8 move_role = chan->move_role;
1100 BT_DBG("chan %p", chan);
1101
1102 chan->move_state = L2CAP_MOVE_STABLE;
1103 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1104
1105 if (chan->mode != L2CAP_MODE_ERTM)
1106 return;
1107
1108 switch (move_role) {
1109 case L2CAP_MOVE_ROLE_INITIATOR:
1110 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1111 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1112 break;
1113 case L2CAP_MOVE_ROLE_RESPONDER:
1114 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1115 break;
1116 }
1117}
1118
9f0caeb1
VCG		 1119static void l2cap_chan_ready(struct l2cap_chan *chan)
1120{
2827011f 1121 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1122 chan->conf_state = 0;
1123 __clear_chan_timer(chan);
1124
54a59aa2 1125 chan->state = BT_CONNECTED;
9f0caeb1 1126
fd83e2c2 1127 chan->ops->ready(chan);
9f0caeb1
VCG		 1128}
1129
93c3e8f5
AE		 1130static void l2cap_start_connection(struct l2cap_chan *chan)
1131{
1132 if (__amp_capable(chan)) {
1133 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1134 a2mp_discover_amp(chan);
1135 } else {
1136 l2cap_send_conn_req(chan);
1137 }
1138}
1139
fc7f8a7e 1140static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1141{
8c1d787b 1142 struct l2cap_conn *conn = chan->conn;
79d554a6 1143
9f0caeb1
VCG		 1144 if (conn->hcon->type == LE_LINK) {
1145 l2cap_chan_ready(chan);
1146 return;
1147 }
1148
79d554a6 1149 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1150 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1151 return;
1152
d45fc423 1153 if (l2cap_chan_check_security(chan) &&
2d792818 1154 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1155 l2cap_start_connection(chan);
1156 }
79d554a6
MH		 1157 } else {
1158 struct l2cap_info_req req;
ac73498c 1159 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1160
1161 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1162 conn->info_ident = l2cap_get_ident(conn);
1163
ba13ccd9 1164 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1165
2d792818
GP		 1166 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1167 sizeof(req), &req);
79d554a6
MH		 1168 }
1169}
1170
cf6c2c0b
GP		 1171static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1172{
1173 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1174 if (!disable_ertm)
cf6c2c0b
GP		 1175 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1176
1177 switch (mode) {
1178 case L2CAP_MODE_ERTM:
1179 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1180 case L2CAP_MODE_STREAMING:
1181 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1182 default:
1183 return 0x00;
1184 }
1185}
1186
5e4e3972 1187static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1188{
6be36555 1189 struct sock *sk = chan->sk;
5e4e3972 1190 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1191 struct l2cap_disconn_req req;
1192
c13ffa62
GP		 1193 if (!conn)
1194 return;
1195
aad3d0e3 1196 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1197 __clear_retrans_timer(chan);
1198 __clear_monitor_timer(chan);
1199 __clear_ack_timer(chan);
c13ffa62
GP		 1200 }
1201
416fa752 1202 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
d117773c 1203 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1204 return;
1205 }
1206
fe4128e0
GP		 1207 req.dcid = cpu_to_le16(chan->dcid);
1208 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1209 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1210 sizeof(req), &req);
c13ffa62 1211
6be36555 1212 lock_sock(sk);
0e587be7 1213 __l2cap_state_change(chan, BT_DISCONN);
2e0052e4 1214 __l2cap_chan_set_err(chan, err);
6be36555 1215 release_sock(sk);
22121fc9
GP		 1216}
1217
1da177e4 1218/* ---- L2CAP connections ---- */
4e8402a3
MH		 1219static void l2cap_conn_start(struct l2cap_conn *conn)
1220{
3df91ea2 1221 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1222
1223 BT_DBG("conn %p", conn);
1224
3df91ea2 1225 mutex_lock(&conn->chan_lock);
4e8402a3 1226
3df91ea2 1227 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 1228 struct sock *sk = chan->sk;
baa7e1fa 1229
6be36555 1230 l2cap_chan_lock(chan);
4e8402a3 1231
715ec005 1232 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1233 l2cap_chan_unlock(chan);
79d554a6
MH		 1234 continue;
1235 }
1236
89bc500e 1237 if (chan->state == BT_CONNECT) {
d45fc423 1238 if (!l2cap_chan_check_security(chan) ||
2d792818 1239 !__l2cap_no_conn_pending(chan)) {
6be36555 1240 l2cap_chan_unlock(chan);
47731de7
GP		 1241 continue;
1242 }
79d554a6 1243
c1360a1c 1244 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1245 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1246 &chan->conf_state)) {
89bc500e 1247 l2cap_chan_close(chan, ECONNRESET);
6be36555 1248 l2cap_chan_unlock(chan);
47731de7 1249 continue;
b1235d79 1250 }
47731de7 1251
93c3e8f5 1252 l2cap_start_connection(chan);
47731de7 1253
89bc500e 1254 } else if (chan->state == BT_CONNECT2) {
79d554a6 1255 struct l2cap_conn_rsp rsp;
e9aeb2dd 1256 char buf[128];
fe4128e0
GP		 1257 rsp.scid = cpu_to_le16(chan->dcid);
1258 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1259
d45fc423 1260 if (l2cap_chan_check_security(chan)) {
6be36555 1261 lock_sock(sk);
c5daa683
GP		 1262 if (test_bit(BT_SK_DEFER_SETUP,
1263 &bt_sk(sk)->flags)) {
ac73498c
AE		 1264 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1265 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1266 chan->ops->defer(chan);
f66dc81f
MH		 1267
1268 } else {
0e587be7 1269 __l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1270 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1271 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1272 }
6be36555 1273 release_sock(sk);
79d554a6 1274 } else {
ac73498c
AE		 1275 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1276 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1277 }
1278
fc7f8a7e 1279 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1280 sizeof(rsp), &rsp);
e9aeb2dd 1281
c1360a1c 1282 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1283 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1284 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1285 continue;
1286 }
1287
c1360a1c 1288 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1289 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1290 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1291 chan->num_conf_req++;
4e8402a3
MH		 1292 }
1293
6be36555 1294 l2cap_chan_unlock(chan);
4e8402a3
MH		 1295 }
1296
3df91ea2 1297 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1298}
1299
c2287681 1300/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1301 * Returns closest match, locked.
1302 */
d9b88702 1303static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1304 bdaddr_t *src,
1305 bdaddr_t *dst)
b62f328b 1306{
23691d75 1307 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1308
23691d75 1309 read_lock(&chan_list_lock);
b62f328b 1310
23691d75
GP		 1311 list_for_each_entry(c, &chan_list, global_l) {
1312 struct sock *sk = c->sk;
fe4128e0 1313
89bc500e 1314 if (state && c->state != state)
b62f328b
VT		 1315 continue;
1316
23691d75 1317 if (c->scid == cid) {
c2287681
IY		 1318 int src_match, dst_match;
1319 int src_any, dst_any;
1320
b62f328b 1321 /* Exact match. */
c2287681
IY		 1322 src_match = !bacmp(&bt_sk(sk)->src, src);
1323 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1324 if (src_match && dst_match) {
23691d75
GP		 1325 read_unlock(&chan_list_lock);
1326 return c;
1327 }
b62f328b
VT		 1328
1329 /* Closest match */
c2287681
IY		 1330 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1331 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1332 if ((src_match && dst_any) || (src_any && dst_match) ||
1333 (src_any && dst_any))
23691d75 1334 c1 = c;
b62f328b
VT		 1335 }
1336 }
280f294f 1337
23691d75 1338 read_unlock(&chan_list_lock);
b62f328b 1339
23691d75 1340 return c1;
b62f328b
VT		 1341}
1342
1343static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1344{
60bac184 1345 struct sock *parent;
23691d75 1346 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 1347
1348 BT_DBG("");
1349
1350 /* Check if we have socket listening on cid */
073d1cf3 1351 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
c2287681 1352 conn->src, conn->dst);
23691d75 1353 if (!pchan)
b62f328b
VT		 1354 return;
1355
44f3b0fb
JH		 1356 /* Client ATT sockets should override the server one */
1357 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1358 return;
1359
23691d75
GP		 1360 parent = pchan->sk;
1361
aa2ac881 1362 lock_sock(parent);
62f3a2cf 1363
80b98027 1364 chan = pchan->ops->new_connection(pchan);
80808e43 1365 if (!chan)
b62f328b
VT		 1366 goto clean;
1367
9f22398c
JH		 1368 chan->dcid = L2CAP_CID_ATT;
1369
60bac184
JH		 1370 bacpy(&bt_sk(chan->sk)->src, conn->src);
1371 bacpy(&bt_sk(chan->sk)->dst, conn->dst);
b62f328b 1372
44f3b0fb 1373 __l2cap_chan_add(conn, chan);
48454079 1374
b62f328b 1375clean:
aa2ac881 1376 release_sock(parent);
b62f328b
VT		 1377}
1378
4e8402a3
MH		 1379static void l2cap_conn_ready(struct l2cap_conn *conn)
1380{
48454079 1381 struct l2cap_chan *chan;
cc110922 1382 struct hci_conn *hcon = conn->hcon;
4e8402a3 1383
79d554a6 1384 BT_DBG("conn %p", conn);
4e8402a3 1385
d8729922
JH		 1386 /* For outgoing pairing which doesn't necessarily have an
1387 * associated socket (e.g. mgmt_pair_device).
1388 */
cc110922
VCG		 1389 if (hcon->out && hcon->type == LE_LINK)
1390 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1391
3df91ea2 1392 mutex_lock(&conn->chan_lock);
4e8402a3 1393
44f3b0fb
JH		 1394 if (hcon->type == LE_LINK)
1395 l2cap_le_conn_ready(conn);
1396
3df91ea2 1397 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1398
6be36555 1399 l2cap_chan_lock(chan);
4e8402a3 1400
416fa752
AE		 1401 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1402 l2cap_chan_unlock(chan);
1403 continue;
1404 }
1405
cc110922
VCG		 1406 if (hcon->type == LE_LINK) {
1407 if (smp_conn_security(hcon, chan->sec_level))
cf4cd009 1408 l2cap_chan_ready(chan);
acd7d370 1409
63128451 1410 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1411 struct sock *sk = chan->sk;
c9b66675 1412 __clear_chan_timer(chan);
6be36555 1413 lock_sock(sk);
0e587be7 1414 __l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1415 sk->sk_state_change(sk);
6be36555 1416 release_sock(sk);
b501d6a1 1417
1c244f79 1418 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1419 l2cap_do_start(chan);
1c244f79 1420 }
4e8402a3 1421
6be36555 1422 l2cap_chan_unlock(chan);
4e8402a3 1423 }
79d554a6 1424
3df91ea2 1425 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1426}
1427
1428/* Notify sockets that we cannot guaranty reliability anymore */
1429static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1430{
48454079 1431 struct l2cap_chan *chan;
4e8402a3
MH		 1432
1433 BT_DBG("conn %p", conn);
1434
3df91ea2 1435 mutex_lock(&conn->chan_lock);
4e8402a3 1436
3df91ea2 1437 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1438 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1439 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1440 }
1441
3df91ea2 1442 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1443}
1444
f878fcad 1445static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1446{
f878fcad 1447 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1448 info_timer.work);
4e8402a3 1449
984947dc 1450 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1451 conn->info_ident = 0;
984947dc 1452
4e8402a3
MH		 1453 l2cap_conn_start(conn);
1454}
1455
2c8e1411
DH		 1456/*
1457 * l2cap_user
1458 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1459 * callback is called during registration. The ->remove callback is called
1460 * during unregistration.
1461 * An l2cap_user object can either be explicitly unregistered or when the
1462 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1463 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1464 * External modules must own a reference to the l2cap_conn object if they intend
1465 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1466 * any time if they don't.
1467 */
1468
1469int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1470{
1471 struct hci_dev *hdev = conn->hcon->hdev;
1472 int ret;
1473
1474 /* We need to check whether l2cap_conn is registered. If it is not, we
1475 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1476 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1477 * relies on the parent hci_conn object to be locked. This itself relies
1478 * on the hci_dev object to be locked. So we must lock the hci device
1479 * here, too. */
1480
1481 hci_dev_lock(hdev);
1482
1483 if (user->list.next || user->list.prev) {
1484 ret = -EINVAL;
1485 goto out_unlock;
1486 }
1487
1488 /* conn->hchan is NULL after l2cap_conn_del() was called */
1489 if (!conn->hchan) {
1490 ret = -ENODEV;
1491 goto out_unlock;
1492 }
1493
1494 ret = user->probe(conn, user);
1495 if (ret)
1496 goto out_unlock;
1497
1498 list_add(&user->list, &conn->users);
1499 ret = 0;
1500
1501out_unlock:
1502 hci_dev_unlock(hdev);
1503 return ret;
1504}
1505EXPORT_SYMBOL(l2cap_register_user);
1506
1507void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1508{
1509 struct hci_dev *hdev = conn->hcon->hdev;
1510
1511 hci_dev_lock(hdev);
1512
1513 if (!user->list.next || !user->list.prev)
1514 goto out_unlock;
1515
1516 list_del(&user->list);
1517 user->list.next = NULL;
1518 user->list.prev = NULL;
1519 user->remove(conn, user);
1520
1521out_unlock:
1522 hci_dev_unlock(hdev);
1523}
1524EXPORT_SYMBOL(l2cap_unregister_user);
1525
1526static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1527{
1528 struct l2cap_user *user;
1529
1530 while (!list_empty(&conn->users)) {
1531 user = list_first_entry(&conn->users, struct l2cap_user, list);
1532 list_del(&user->list);
1533 user->list.next = NULL;
1534 user->list.prev = NULL;
1535 user->remove(conn, user);
1536 }
1537}
1538
5d3de7df
VCG		 1539static void l2cap_conn_del(struct hci_conn *hcon, int err)
1540{
1541 struct l2cap_conn *conn = hcon->l2cap_data;
1542 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1543
1544 if (!conn)
1545 return;
1546
1547 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1548
1549 kfree_skb(conn->rx_skb);
1550
2c8e1411
DH		 1551 l2cap_unregister_all_users(conn);
1552
3df91ea2
AE		 1553 mutex_lock(&conn->chan_lock);
1554
5d3de7df
VCG		 1555 /* Kill channels */
1556 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1557 l2cap_chan_hold(chan);
6be36555
AE		 1558 l2cap_chan_lock(chan);
1559
5d3de7df 1560 l2cap_chan_del(chan, err);
6be36555
AE		 1561
1562 l2cap_chan_unlock(chan);
1563
80b98027 1564 chan->ops->close(chan);
61d6ef3e 1565 l2cap_chan_put(chan);
5d3de7df
VCG		 1566 }
1567
3df91ea2
AE		 1568 mutex_unlock(&conn->chan_lock);
1569
73d80deb
LAD		 1570 hci_chan_del(conn->hchan);
1571
5d3de7df 1572 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1573 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1574
51a8efd7 1575 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1576 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1577 smp_chan_destroy(conn);
d26a2345 1578 }
5d3de7df
VCG		 1579
1580 hcon->l2cap_data = NULL;
9c903e37
DH		 1581 conn->hchan = NULL;
1582 l2cap_conn_put(conn);
5d3de7df
VCG		 1583}
1584
6c9d42a1 1585static void security_timeout(struct work_struct *work)
5d3de7df 1586{
6c9d42a1 1587 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1588 security_timer.work);
5d3de7df 1589
d06cc416
JH		 1590 BT_DBG("conn %p", conn);
1591
1592 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1593 smp_chan_destroy(conn);
1594 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1595 }
5d3de7df
VCG		 1596}
1597
baf43251 1598static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
1da177e4 1599{
0139418c 1600 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1601 struct hci_chan *hchan;
1da177e4 1602
baf43251 1603 if (conn)
1da177e4
LT		 1604 return conn;
1605
73d80deb
LAD		 1606 hchan = hci_chan_create(hcon);
1607 if (!hchan)
1608 return NULL;
1609
8bcde1f2 1610 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
73d80deb
LAD		 1611 if (!conn) {
1612 hci_chan_del(hchan);
1da177e4 1613 return NULL;
73d80deb 1614 }
1da177e4 1615
9c903e37 1616 kref_init(&conn->ref);
1da177e4
LT		 1617 hcon->l2cap_data = conn;
1618 conn->hcon = hcon;
9c903e37 1619 hci_conn_get(conn->hcon);
73d80deb 1620 conn->hchan = hchan;
1da177e4 1621
73d80deb 1622 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1623
dcc042d5 1624 switch (hcon->type) {
dcc042d5
AE		 1625 case LE_LINK:
1626 if (hcon->hdev->le_mtu) {
1627 conn->mtu = hcon->hdev->le_mtu;
1628 break;
1629 }
1630 /* fall through */
dcc042d5 1631 default:
acd7d370 1632 conn->mtu = hcon->hdev->acl_mtu;
dcc042d5
AE		 1633 break;
1634 }
acd7d370 1635
1da177e4
LT		 1636 conn->src = &hcon->hdev->bdaddr;
1637 conn->dst = &hcon->dst;
1638
4e8402a3
MH		 1639 conn->feat_mask = 0;
1640
1da177e4 1641 spin_lock_init(&conn->lock);
3df91ea2 1642 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1643
1644 INIT_LIST_HEAD(&conn->chan_l);
2c8e1411 1645 INIT_LIST_HEAD(&conn->users);
1da177e4 1646
5d3de7df 1647 if (hcon->type == LE_LINK)
6c9d42a1 1648 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1649 else
030013d8 1650 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1651
9f5a0d7b 1652 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1653
1da177e4
LT		 1654 return conn;
1655}
1656
9c903e37
DH		 1657static void l2cap_conn_free(struct kref *ref)
1658{
1659 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1660
1661 hci_conn_put(conn->hcon);
1662 kfree(conn);
1663}
1664
1665void l2cap_conn_get(struct l2cap_conn *conn)
1666{
1667 kref_get(&conn->ref);
1668}
1669EXPORT_SYMBOL(l2cap_conn_get);
1670
1671void l2cap_conn_put(struct l2cap_conn *conn)
1672{
1673 kref_put(&conn->ref, l2cap_conn_free);
1674}
1675EXPORT_SYMBOL(l2cap_conn_put);
1676
1da177e4 1677/* ---- Socket interface ---- */
1da177e4 1678
c2287681 1679/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1680 * Returns closest match.
1681 */
c2287681
IY		 1682static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1683 bdaddr_t *src,
1684 bdaddr_t *dst)
1da177e4 1685{
23691d75 1686 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1687
23691d75 1688 read_lock(&chan_list_lock);
e0f0cb56 1689
23691d75
GP		 1690 list_for_each_entry(c, &chan_list, global_l) {
1691 struct sock *sk = c->sk;
fe4128e0 1692
89bc500e 1693 if (state && c->state != state)
1da177e4
LT		 1694 continue;
1695
23691d75 1696 if (c->psm == psm) {
c2287681
IY		 1697 int src_match, dst_match;
1698 int src_any, dst_any;
1699
1da177e4 1700 /* Exact match. */
c2287681
IY		 1701 src_match = !bacmp(&bt_sk(sk)->src, src);
1702 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1703 if (src_match && dst_match) {
a7567b20 1704 read_unlock(&chan_list_lock);
23691d75
GP		 1705 return c;
1706 }
1da177e4
LT		 1707
1708 /* Closest match */
c2287681
IY		 1709 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1710 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1711 if ((src_match && dst_any) || (src_any && dst_match) ||
1712 (src_any && dst_any))
23691d75 1713 c1 = c;
1da177e4
LT		 1714 }
1715 }
1da177e4 1716
23691d75 1717 read_unlock(&chan_list_lock);
e0f0cb56 1718
23691d75 1719 return c1;
1da177e4
LT		 1720}
1721
8e9f9892
AG		 1722int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1723 bdaddr_t *dst, u8 dst_type)
1da177e4 1724{
5d41ce1d 1725 struct sock *sk = chan->sk;
1da177e4 1726 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1727 struct l2cap_conn *conn;
1728 struct hci_conn *hcon;
1729 struct hci_dev *hdev;
09ab6f4c 1730 __u8 auth_type;
44d0e48e 1731 int err;
1da177e4 1732
6ed93dc6 1733 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst,
ab19516a 1734 dst_type, __le16_to_cpu(psm));
1da177e4 1735
af05b30b
GP		 1736 hdev = hci_get_route(dst, src);
1737 if (!hdev)
1da177e4
LT		 1738 return -EHOSTUNREACH;
1739
09fd0de5 1740 hci_dev_lock(hdev);
1da177e4 1741
6be36555 1742 l2cap_chan_lock(chan);
03a00194
GP		 1743
1744 /* PSM must be odd and lsb of upper byte must be 0 */
1745 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
2d792818 1746 chan->chan_type != L2CAP_CHAN_RAW) {
03a00194
GP		 1747 err = -EINVAL;
1748 goto done;
1749 }
1750
1751 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1752 err = -EINVAL;
1753 goto done;
1754 }
1755
1756 switch (chan->mode) {
1757 case L2CAP_MODE_BASIC:
1758 break;
1759 case L2CAP_MODE_ERTM:
1760 case L2CAP_MODE_STREAMING:
1761 if (!disable_ertm)
1762 break;
1763 /* fall through */
1764 default:
1765 err = -ENOTSUPP;
1766 goto done;
1767 }
1768
0797e01d 1769 switch (chan->state) {
03a00194
GP		 1770 case BT_CONNECT:
1771 case BT_CONNECT2:
1772 case BT_CONFIG:
1773 /* Already connecting */
1774 err = 0;
1775 goto done;
1776
1777 case BT_CONNECTED:
1778 /* Already connected */
1779 err = -EISCONN;
1780 goto done;
1781
1782 case BT_OPEN:
1783 case BT_BOUND:
1784 /* Can connect */
1785 break;
1786
1787 default:
1788 err = -EBADFD;
1789 goto done;
1790 }
1791
1792 /* Set destination address and psm */
0797e01d 1793 lock_sock(sk);
9219b2a0 1794 bacpy(&bt_sk(sk)->dst, dst);
6be36555
AE		 1795 release_sock(sk);
1796
03a00194
GP		 1797 chan->psm = psm;
1798 chan->dcid = cid;
1da177e4 1799
4343478f 1800 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1801
f224ca5f 1802 if (bdaddr_type_is_le(dst_type))
8e9f9892 1803 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1804 chan->sec_level, auth_type);
acd7d370 1805 else
8e9f9892 1806 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1807 chan->sec_level, auth_type);
acd7d370 1808
30e76272
VT		 1809 if (IS_ERR(hcon)) {
1810 err = PTR_ERR(hcon);
1da177e4 1811 goto done;
30e76272 1812 }
1da177e4 1813
baf43251 1814 conn = l2cap_conn_add(hcon);
1da177e4 1815 if (!conn) {
76a68ba0 1816 hci_conn_drop(hcon);
30e76272 1817 err = -ENOMEM;
1da177e4
LT		 1818 goto done;
1819 }
1820
141d5706
JH		 1821 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
1822 hci_conn_drop(hcon);
1823 err = -EBUSY;
1824 goto done;
9f0caeb1
VCG		 1825 }
1826
1da177e4
LT		 1827 /* Update source addr of the socket */
1828 bacpy(src, conn->src);
1829
6be36555 1830 l2cap_chan_unlock(chan);
48454079 1831 l2cap_chan_add(conn, chan);
6be36555 1832 l2cap_chan_lock(chan);
48454079 1833
5ee9891d
JH		 1834 /* l2cap_chan_add takes its own ref so we can drop this one */
1835 hci_conn_drop(hcon);
1836
6be36555 1837 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1838 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1839
1840 if (hcon->state == BT_CONNECTED) {
715ec005 1841 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1842 __clear_chan_timer(chan);
d45fc423 1843 if (l2cap_chan_check_security(chan))
6be36555 1844 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1845 } else
fc7f8a7e 1846 l2cap_do_start(chan);
1da177e4
LT		 1847 }
1848
30e76272
VT		 1849 err = 0;
1850
1da177e4 1851done:
6be36555 1852 l2cap_chan_unlock(chan);
09fd0de5 1853 hci_dev_unlock(hdev);
1da177e4
LT		 1854 hci_dev_put(hdev);
1855 return err;
1856}
1857
dcba0dba 1858int __l2cap_wait_ack(struct sock *sk)
6161c038 1859{
8c1d787b 1860 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1861 DECLARE_WAITQUEUE(wait, current);
1862 int err = 0;
1863 int timeo = HZ/5;
1864
2b0b05dd 1865 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1866 set_current_state(TASK_INTERRUPTIBLE);
1867 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1868 if (!timeo)
1869 timeo = HZ/5;
1870
1871 if (signal_pending(current)) {
1872 err = sock_intr_errno(timeo);
1873 break;
1874 }
1875
1876 release_sock(sk);
1877 timeo = schedule_timeout(timeo);
1878 lock_sock(sk);
a71a0cf4 1879 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1880
1881 err = sock_error(sk);
1882 if (err)
1883 break;
1884 }
1885 set_current_state(TASK_RUNNING);
2b0b05dd 1886 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1887 return err;
1888}
1889
721c4181 1890static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1891{
721c4181 1892 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1893 monitor_timer.work);
e90bac06 1894
525cd185 1895 BT_DBG("chan %p", chan);
0e98958d 1896
6be36555
AE		 1897 l2cap_chan_lock(chan);
1898
80909e04 1899 if (!chan->conn) {
6be36555 1900 l2cap_chan_unlock(chan);
8d7e1c7f 1901 l2cap_chan_put(chan);
e90bac06
GP		 1902 return;
1903 }
1904
401bb1f7 1905 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1906
6be36555 1907 l2cap_chan_unlock(chan);
8d7e1c7f 1908 l2cap_chan_put(chan);
e90bac06
GP		 1909}
1910
721c4181 1911static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1912{
721c4181 1913 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1914 retrans_timer.work);
e90bac06 1915
49208c9c 1916 BT_DBG("chan %p", chan);
0e98958d 1917
6be36555
AE		 1918 l2cap_chan_lock(chan);
1919
80909e04
MM		 1920 if (!chan->conn) {
1921 l2cap_chan_unlock(chan);
1922 l2cap_chan_put(chan);
1923 return;
1924 }
6be36555 1925
401bb1f7 1926 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1927 l2cap_chan_unlock(chan);
8d7e1c7f 1928 l2cap_chan_put(chan);
e90bac06
GP		 1929}
1930
d660366d
GP		 1931static void l2cap_streaming_send(struct l2cap_chan *chan,
1932 struct sk_buff_head *skbs)
6840ed07 1933{
ccbb84af 1934 struct sk_buff *skb;
3733937d 1935 struct l2cap_ctrl *control;
6840ed07 1936
3733937d
MM		 1937 BT_DBG("chan %p, skbs %p", chan, skbs);
1938
b99e13ad
MM		 1939 if (__chan_is_moving(chan))
1940 return;
1941
3733937d
MM		 1942 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1943
1944 while (!skb_queue_empty(&chan->tx_q)) {
1945
1946 skb = skb_dequeue(&chan->tx_q);
1947
1948 bt_cb(skb)->control.retries = 1;
1949 control = &bt_cb(skb)->control;
1950
1951 control->reqseq = 0;
1952 control->txseq = chan->next_tx_seq;
1953
1954 __pack_control(chan, control, skb);
6840ed07 1955
47d1ec61 1956 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1957 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1958 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1959 }
1960
4343478f 1961 l2cap_do_send(chan, skb);
6840ed07 1962
b4400672 1963 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1964
836be934 1965 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1966 chan->frames_sent++;
6840ed07 1967 }
6840ed07
GP		 1968}
1969
67c9e840 1970static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1971{
1972 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1973 struct l2cap_ctrl *control;
1974 int sent = 0;
1975
1976 BT_DBG("chan %p", chan);
1c2acffb 1977
89bc500e 1978 if (chan->state != BT_CONNECTED)
c13ffa62 1979 return -ENOTCONN;
e90bac06 1980
94122bbe
MM		 1981 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1982 return 0;
1983
b99e13ad
MM		 1984 if (__chan_is_moving(chan))
1985 return 0;
1986
18a48e76
MM		 1987 while (chan->tx_send_head &&
1988 chan->unacked_frames < chan->remote_tx_win &&
1989 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1990
18a48e76 1991 skb = chan->tx_send_head;
e90bac06 1992
18a48e76
MM		 1993 bt_cb(skb)->control.retries = 1;
1994 control = &bt_cb(skb)->control;
95ffa978 1995
e2ab4353 1996 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1997 control->final = 1;
e2ab4353 1998
18a48e76
MM		 1999 control->reqseq = chan->buffer_seq;
2000 chan->last_acked_seq = chan->buffer_seq;
2001 control->txseq = chan->next_tx_seq;
1c2acffb 2002
18a48e76 2003 __pack_control(chan, control, skb);
e90bac06 2004
47d1ec61 2005 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 2006 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
2007 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 2008 }
2009
18a48e76
MM		 2010 /* Clone after data has been modified. Data is assumed to be
2011 read-only (for locking purposes) on cloned sk_buffs.
2012 */
2013 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 2014
18a48e76
MM		 2015 if (!tx_skb)
2016 break;
1c2acffb 2017
18a48e76 2018 __set_retrans_timer(chan);
836be934
AE		 2019
2020 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 2021 chan->unacked_frames++;
6a026610 2022 chan->frames_sent++;
18a48e76 2023 sent++;
1c2acffb 2024
58d35f87
GP		 2025 if (skb_queue_is_last(&chan->tx_q, skb))
2026 chan->tx_send_head = NULL;
1c2acffb 2027 else
58d35f87 2028 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 2029
2030 l2cap_do_send(chan, tx_skb);
b4400672 2031 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 2032 }
2033
b4400672
AE		 2034 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
2035 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 2036
2037 return sent;
9e917af1
GP		 2038}
2039
e1fbd4c1
MM		 2040static void l2cap_ertm_resend(struct l2cap_chan *chan)
2041{
2042 struct l2cap_ctrl control;
2043 struct sk_buff *skb;
2044 struct sk_buff *tx_skb;
2045 u16 seq;
2046
2047 BT_DBG("chan %p", chan);
2048
2049 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2050 return;
2051
b99e13ad
MM		 2052 if (__chan_is_moving(chan))
2053 return;
2054
e1fbd4c1
MM		 2055 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
2056 seq = l2cap_seq_list_pop(&chan->retrans_list);
2057
2058 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
2059 if (!skb) {
2060 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 2061 seq);
e1fbd4c1
MM		 2062 continue;
2063 }
2064
2065 bt_cb(skb)->control.retries++;
2066 control = bt_cb(skb)->control;
2067
2068 if (chan->max_tx != 0 &&
2069 bt_cb(skb)->control.retries > chan->max_tx) {
2070 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 2071 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 2072 l2cap_seq_list_clear(&chan->retrans_list);
2073 break;
2074 }
2075
2076 control.reqseq = chan->buffer_seq;
2077 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2078 control.final = 1;
2079 else
2080 control.final = 0;
2081
2082 if (skb_cloned(skb)) {
2083 /* Cloned sk_buffs are read-only, so we need a
2084 * writeable copy
2085 */
8bcde1f2 2086 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 2087 } else {
8bcde1f2 2088 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 2089 }
2090
2091 if (!tx_skb) {
2092 l2cap_seq_list_clear(&chan->retrans_list);
2093 break;
2094 }
2095
2096 /* Update skb contents */
2097 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2098 put_unaligned_le32(__pack_extended_control(&control),
2099 tx_skb->data + L2CAP_HDR_SIZE);
2100 } else {
2101 put_unaligned_le16(__pack_enhanced_control(&control),
2102 tx_skb->data + L2CAP_HDR_SIZE);
2103 }
2104
2105 if (chan->fcs == L2CAP_FCS_CRC16) {
2106 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2107 put_unaligned_le16(fcs, skb_put(tx_skb,
2108 L2CAP_FCS_SIZE));
2109 }
2110
2111 l2cap_do_send(chan, tx_skb);
2112
2113 BT_DBG("Resent txseq %d", control.txseq);
2114
2115 chan->last_acked_seq = chan->buffer_seq;
2116 }
2117}
2118
f80842a8
MM		 2119static void l2cap_retransmit(struct l2cap_chan *chan,
2120 struct l2cap_ctrl *control)
2121{
2122 BT_DBG("chan %p, control %p", chan, control);
2123
2124 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2125 l2cap_ertm_resend(chan);
2126}
2127
d2a7ac5d
MM		 2128static void l2cap_retransmit_all(struct l2cap_chan *chan,
2129 struct l2cap_ctrl *control)
2130{
e1fbd4c1
MM		 2131 struct sk_buff *skb;
2132
2133 BT_DBG("chan %p, control %p", chan, control);
2134
2135 if (control->poll)
2136 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2137
2138 l2cap_seq_list_clear(&chan->retrans_list);
2139
2140 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2141 return;
2142
2143 if (chan->unacked_frames) {
2144 skb_queue_walk(&chan->tx_q, skb) {
2145 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2146 skb == chan->tx_send_head)
e1fbd4c1
MM		 2147 break;
2148 }
2149
2150 skb_queue_walk_from(&chan->tx_q, skb) {
2151 if (skb == chan->tx_send_head)
2152 break;
2153
2154 l2cap_seq_list_append(&chan->retrans_list,
2155 bt_cb(skb)->control.txseq);
2156 }
2157
2158 l2cap_ertm_resend(chan);
2159 }
d2a7ac5d
MM		 2160}
2161
0a0aba42 2162static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2163{
0a0aba42
MM		 2164 struct l2cap_ctrl control;
2165 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2166 chan->last_acked_seq);
2167 int threshold;
9e917af1 2168
0a0aba42
MM		 2169 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2170 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2171
0a0aba42
MM		 2172 memset(&control, 0, sizeof(control));
2173 control.sframe = 1;
dfc909be 2174
0a0aba42
MM		 2175 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2176 chan->rx_state == L2CAP_RX_STATE_RECV) {
2177 __clear_ack_timer(chan);
2178 control.super = L2CAP_SUPER_RNR;
2179 control.reqseq = chan->buffer_seq;
2180 l2cap_send_sframe(chan, &control);
2181 } else {
2182 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2183 l2cap_ertm_send(chan);
2184 /* If any i-frames were sent, they included an ack */
2185 if (chan->buffer_seq == chan->last_acked_seq)
2186 frames_to_ack = 0;
2187 }
dfc909be 2188
c20f8e35 2189 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2190 * Calculate without mul or div
2191 */
c20f8e35 2192 threshold = chan->ack_win;
0a0aba42
MM		 2193 threshold += threshold << 1;
2194 threshold >>= 2;
2195
b4400672 2196 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2197 threshold);
2198
2199 if (frames_to_ack >= threshold) {
2200 __clear_ack_timer(chan);
2201 control.super = L2CAP_SUPER_RR;
2202 control.reqseq = chan->buffer_seq;
2203 l2cap_send_sframe(chan, &control);
2204 frames_to_ack = 0;
2205 }
1c2acffb 2206
0a0aba42
MM		 2207 if (frames_to_ack)
2208 __set_ack_timer(chan);
2209 }
b17e73bb
SJ		 2210}
2211
04124681
GP		 2212static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2213 struct msghdr *msg, int len,
2214 int count, struct sk_buff *skb)
1c2acffb 2215{
0952a57a 2216 struct l2cap_conn *conn = chan->conn;
1c2acffb 2217 struct sk_buff **frag;
90338947 2218 int sent = 0;
1da177e4 2219
59203a21 2220 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2221 return -EFAULT;
1da177e4
LT		 2222
2223 sent += count;
2224 len -= count;
2225
2226 /* Continuation fragments (no L2CAP header) */
2227 frag = &skb_shinfo(skb)->frag_list;
2228 while (len) {
fbe00700
GP		 2229 struct sk_buff *tmp;
2230
1da177e4
LT		 2231 count = min_t(unsigned int, conn->mtu, len);
2232
fbe00700
GP		 2233 tmp = chan->ops->alloc_skb(chan, count,
2234 msg->msg_flags & MSG_DONTWAIT);
2235 if (IS_ERR(tmp))
2236 return PTR_ERR(tmp);
2237
2238 *frag = tmp;
2f7719ce 2239
1c2acffb
GP		 2240 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2241 return -EFAULT;
1da177e4 2242
5e59b791
LAD		 2243 (*frag)->priority = skb->priority;
2244
1da177e4
LT		 2245 sent += count;
2246 len -= count;
2247
2d0ed3d5
GP		 2248 skb->len += (*frag)->len;
2249 skb->data_len += (*frag)->len;
2250
1da177e4
LT		 2251 frag = &(*frag)->next;
2252 }
1da177e4
LT		 2253
2254 return sent;
1c2acffb 2255}
1da177e4 2256
5e59b791 2257static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2258 struct msghdr *msg, size_t len,
2259 u32 priority)
1c2acffb 2260{
8c1d787b 2261 struct l2cap_conn *conn = chan->conn;
1c2acffb 2262 struct sk_buff *skb;
03a51213 2263 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2264 struct l2cap_hdr *lh;
2265
b4400672 2266 BT_DBG("chan %p len %zu priority %u", chan, len, priority);
1c2acffb
GP		 2267
2268 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2269
2270 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2271 msg->msg_flags & MSG_DONTWAIT);
2272 if (IS_ERR(skb))
2273 return skb;
1c2acffb 2274
5e59b791
LAD		 2275 skb->priority = priority;
2276
1c2acffb
GP		 2277 /* Create L2CAP header */
2278 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2279 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c
AE		 2280 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2281 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2282
0952a57a 2283 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2284 if (unlikely(err < 0)) {
2285 kfree_skb(skb);
2286 return ERR_PTR(err);
2287 }
2288 return skb;
2289}
2290
5e59b791 2291static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2292 struct msghdr *msg, size_t len,
2293 u32 priority)
1c2acffb 2294{
8c1d787b 2295 struct l2cap_conn *conn = chan->conn;
1c2acffb 2296 struct sk_buff *skb;
f2ba7fae 2297 int err, count;
1c2acffb
GP		 2298 struct l2cap_hdr *lh;
2299
b4400672 2300 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2301
f2ba7fae 2302 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2303
f2ba7fae 2304 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2305 msg->msg_flags & MSG_DONTWAIT);
2306 if (IS_ERR(skb))
2307 return skb;
1c2acffb 2308
5e59b791
LAD		 2309 skb->priority = priority;
2310
1c2acffb
GP		 2311 /* Create L2CAP header */
2312 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2313 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2314 lh->len = cpu_to_le16(len);
1c2acffb 2315
0952a57a 2316 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2317 if (unlikely(err < 0)) {
2318 kfree_skb(skb);
2319 return ERR_PTR(err);
2320 }
2321 return skb;
2322}
2323
ab0ff76d 2324static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2325 struct msghdr *msg, size_t len,
2326 u16 sdulen)
1c2acffb 2327{
8c1d787b 2328 struct l2cap_conn *conn = chan->conn;
1c2acffb 2329 struct sk_buff *skb;
e4ca6d98 2330 int err, count, hlen;
1c2acffb
GP		 2331 struct l2cap_hdr *lh;
2332
b4400672 2333 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2334
0ee0d208
GP		 2335 if (!conn)
2336 return ERR_PTR(-ENOTCONN);
2337
ba7aa64f 2338 hlen = __ertm_hdr_size(chan);
e4ca6d98 2339
c74e560c 2340 if (sdulen)
03a51213 2341 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2342
47d1ec61 2343 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2344 hlen += L2CAP_FCS_SIZE;
fcc203c3 2345
1c2acffb 2346 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2347
2348 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2349 msg->msg_flags & MSG_DONTWAIT);
2350 if (IS_ERR(skb))
2351 return skb;
1c2acffb
GP		 2352
2353 /* Create L2CAP header */
2354 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2355 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2356 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2357
18a48e76
MM		 2358 /* Control header is populated later */
2359 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2360 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2361 else
2362 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2363
c74e560c 2364 if (sdulen)
03a51213 2365 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2366
0952a57a 2367 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2368 if (unlikely(err < 0)) {
2369 kfree_skb(skb);
2370 return ERR_PTR(err);
2371 }
e90bac06 2372
18a48e76 2373 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2374 bt_cb(skb)->control.retries = 0;
1c2acffb 2375 return skb;
1da177e4
LT		 2376}
2377
94122bbe
MM		 2378static int l2cap_segment_sdu(struct l2cap_chan *chan,
2379 struct sk_buff_head *seg_queue,
2380 struct msghdr *msg, size_t len)
c74e560c 2381{
c74e560c 2382 struct sk_buff *skb;
94122bbe
MM		 2383 u16 sdu_len;
2384 size_t pdu_len;
94122bbe 2385 u8 sar;
c74e560c 2386
b4400672 2387 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2388
94122bbe
MM		 2389 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2390 * so fragmented skbs are not used. The HCI layer's handling
2391 * of fragmented skbs is not compatible with ERTM's queueing.
2392 */
c74e560c 2393
94122bbe
MM		 2394 /* PDU size is derived from the HCI MTU */
2395 pdu_len = chan->conn->mtu;
c74e560c 2396
a549574d
MM		 2397 /* Constrain PDU size for BR/EDR connections */
2398 if (!chan->hs_hcon)
2399 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2400
2401 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2402 if (chan->fcs)
2403 pdu_len -= L2CAP_FCS_SIZE;
2404
ba7aa64f 2405 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2406
2407 /* Remote device may have requested smaller PDUs */
2408 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2409
2410 if (len <= pdu_len) {
2411 sar = L2CAP_SAR_UNSEGMENTED;
2412 sdu_len = 0;
2413 pdu_len = len;
2414 } else {
2415 sar = L2CAP_SAR_START;
2416 sdu_len = len;
2417 pdu_len -= L2CAP_SDULEN_SIZE;
2418 }
2419
2420 while (len > 0) {
2421 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2422
c74e560c 2423 if (IS_ERR(skb)) {
94122bbe 2424 __skb_queue_purge(seg_queue);
c74e560c
GP		 2425 return PTR_ERR(skb);
2426 }
2427
94122bbe
MM		 2428 bt_cb(skb)->control.sar = sar;
2429 __skb_queue_tail(seg_queue, skb);
2430
2431 len -= pdu_len;
2432 if (sdu_len) {
2433 sdu_len = 0;
2434 pdu_len += L2CAP_SDULEN_SIZE;
2435 }
2436
2437 if (len <= pdu_len) {
2438 sar = L2CAP_SAR_END;
2439 pdu_len = len;
2440 } else {
2441 sar = L2CAP_SAR_CONTINUE;
2442 }
c74e560c 2443 }
c74e560c 2444
f0f62799 2445 return 0;
c74e560c
GP		 2446}
2447
5e59b791 2448int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2449 u32 priority)
9a91a04a 2450{
9a91a04a 2451 struct sk_buff *skb;
9a91a04a 2452 int err;
94122bbe 2453 struct sk_buff_head seg_queue;
9a91a04a
GP		 2454
2455 /* Connectionless channel */
715ec005 2456 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2457 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2458 if (IS_ERR(skb))
2459 return PTR_ERR(skb);
2460
2461 l2cap_do_send(chan, skb);
2462 return len;
2463 }
2464
2465 switch (chan->mode) {
2466 case L2CAP_MODE_BASIC:
2467 /* Check outgoing MTU */
2468 if (len > chan->omtu)
2469 return -EMSGSIZE;
2470
2471 /* Create a basic PDU */
5e59b791 2472 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2473 if (IS_ERR(skb))
2474 return PTR_ERR(skb);
2475
2476 l2cap_do_send(chan, skb);
2477 err = len;
2478 break;
2479
2480 case L2CAP_MODE_ERTM:
2481 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2482 /* Check outgoing MTU */
2483 if (len > chan->omtu) {
2484 err = -EMSGSIZE;
2485 break;
2486 }
9a91a04a 2487
94122bbe 2488 __skb_queue_head_init(&seg_queue);
9a91a04a 2489
94122bbe
MM		 2490 /* Do segmentation before calling in to the state machine,
2491 * since it's possible to block while waiting for memory
2492 * allocation.
2493 */
2494 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2495
94122bbe
MM		 2496 /* The channel could have been closed while segmenting,
2497 * check that it is still connected.
2498 */
2499 if (chan->state != BT_CONNECTED) {
2500 __skb_queue_purge(&seg_queue);
2501 err = -ENOTCONN;
9a91a04a
GP		 2502 }
2503
94122bbe 2504 if (err)
9a91a04a 2505 break;
9a91a04a 2506
3733937d 2507 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2508 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2509 else
d660366d 2510 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2511
d660366d 2512 err = len;
9a91a04a 2513
94122bbe
MM		 2514 /* If the skbs were not queued for sending, they'll still be in
2515 * seg_queue and need to be purged.
2516 */
2517 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2518 break;
2519
2520 default:
2521 BT_DBG("bad state %1.1x", chan->mode);
2522 err = -EBADFD;
2523 }
2524
2525 return err;
2526}
2527
d2a7ac5d
MM		 2528static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2529{
bed68bde
MM		 2530 struct l2cap_ctrl control;
2531 u16 seq;
2532
b4400672 2533 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2534
2535 memset(&control, 0, sizeof(control));
2536 control.sframe = 1;
2537 control.super = L2CAP_SUPER_SREJ;
2538
2539 for (seq = chan->expected_tx_seq; seq != txseq;
2540 seq = __next_seq(chan, seq)) {
2541 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2542 control.reqseq = seq;
2543 l2cap_send_sframe(chan, &control);
2544 l2cap_seq_list_append(&chan->srej_list, seq);
2545 }
2546 }
2547
2548 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2549}
2550
2551static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2552{
bed68bde
MM		 2553 struct l2cap_ctrl control;
2554
2555 BT_DBG("chan %p", chan);
2556
2557 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2558 return;
2559
2560 memset(&control, 0, sizeof(control));
2561 control.sframe = 1;
2562 control.super = L2CAP_SUPER_SREJ;
2563 control.reqseq = chan->srej_list.tail;
2564 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2565}
2566
2567static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2568{
bed68bde
MM		 2569 struct l2cap_ctrl control;
2570 u16 initial_head;
2571 u16 seq;
2572
b4400672 2573 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2574
2575 memset(&control, 0, sizeof(control));
2576 control.sframe = 1;
2577 control.super = L2CAP_SUPER_SREJ;
2578
2579 /* Capture initial list head to allow only one pass through the list. */
2580 initial_head = chan->srej_list.head;
2581
2582 do {
2583 seq = l2cap_seq_list_pop(&chan->srej_list);
2584 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2585 break;
2586
2587 control.reqseq = seq;
2588 l2cap_send_sframe(chan, &control);
2589 l2cap_seq_list_append(&chan->srej_list, seq);
2590 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2591}
2592
608bcc6d
MM		 2593static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2594{
2595 struct sk_buff *acked_skb;
2596 u16 ackseq;
2597
b4400672 2598 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2599
2600 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2601 return;
2602
b4400672 2603 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2604 chan->expected_ack_seq, chan->unacked_frames);
2605
2606 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2607 ackseq = __next_seq(chan, ackseq)) {
2608
2609 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2610 if (acked_skb) {
2611 skb_unlink(acked_skb, &chan->tx_q);
2612 kfree_skb(acked_skb);
2613 chan->unacked_frames--;
2614 }
2615 }
2616
2617 chan->expected_ack_seq = reqseq;
2618
2619 if (chan->unacked_frames == 0)
2620 __clear_retrans_timer(chan);
2621
b4400672 2622 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2623}
2624
2625static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2626{
2627 BT_DBG("chan %p", chan);
2628
2629 chan->expected_tx_seq = chan->buffer_seq;
2630 l2cap_seq_list_clear(&chan->srej_list);
2631 skb_queue_purge(&chan->srej_q);
2632 chan->rx_state = L2CAP_RX_STATE_RECV;
2633}
2634
d660366d
GP		 2635static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2636 struct l2cap_ctrl *control,
2637 struct sk_buff_head *skbs, u8 event)
608bcc6d 2638{
608bcc6d
MM		 2639 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2640 event);
2641
2642 switch (event) {
2643 case L2CAP_EV_DATA_REQUEST:
2644 if (chan->tx_send_head == NULL)
2645 chan->tx_send_head = skb_peek(skbs);
2646
2647 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2648 l2cap_ertm_send(chan);
2649 break;
2650 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2651 BT_DBG("Enter LOCAL_BUSY");
2652 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2653
2654 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2655 /* The SREJ_SENT state must be aborted if we are to
2656 * enter the LOCAL_BUSY state.
2657 */
2658 l2cap_abort_rx_srej_sent(chan);
2659 }
2660
2661 l2cap_send_ack(chan);
2662
2663 break;
2664 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2665 BT_DBG("Exit LOCAL_BUSY");
2666 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2667
2668 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2669 struct l2cap_ctrl local_control;
2670
2671 memset(&local_control, 0, sizeof(local_control));
2672 local_control.sframe = 1;
2673 local_control.super = L2CAP_SUPER_RR;
2674 local_control.poll = 1;
2675 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2676 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2677
2678 chan->retry_count = 1;
2679 __set_monitor_timer(chan);
2680 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2681 }
2682 break;
2683 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2684 l2cap_process_reqseq(chan, control->reqseq);
2685 break;
2686 case L2CAP_EV_EXPLICIT_POLL:
2687 l2cap_send_rr_or_rnr(chan, 1);
2688 chan->retry_count = 1;
2689 __set_monitor_timer(chan);
2690 __clear_ack_timer(chan);
2691 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2692 break;
2693 case L2CAP_EV_RETRANS_TO:
2694 l2cap_send_rr_or_rnr(chan, 1);
2695 chan->retry_count = 1;
2696 __set_monitor_timer(chan);
2697 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2698 break;
2699 case L2CAP_EV_RECV_FBIT:
2700 /* Nothing to process */
2701 break;
2702 default:
2703 break;
2704 }
608bcc6d
MM		 2705}
2706
d660366d
GP		 2707static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2708 struct l2cap_ctrl *control,
2709 struct sk_buff_head *skbs, u8 event)
608bcc6d 2710{
608bcc6d
MM		 2711 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2712 event);
2713
2714 switch (event) {
2715 case L2CAP_EV_DATA_REQUEST:
2716 if (chan->tx_send_head == NULL)
2717 chan->tx_send_head = skb_peek(skbs);
2718 /* Queue data, but don't send. */
2719 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2720 break;
2721 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2722 BT_DBG("Enter LOCAL_BUSY");
2723 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2724
2725 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2726 /* The SREJ_SENT state must be aborted if we are to
2727 * enter the LOCAL_BUSY state.
2728 */
2729 l2cap_abort_rx_srej_sent(chan);
2730 }
2731
2732 l2cap_send_ack(chan);
2733
2734 break;
2735 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2736 BT_DBG("Exit LOCAL_BUSY");
2737 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2738
2739 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2740 struct l2cap_ctrl local_control;
2741 memset(&local_control, 0, sizeof(local_control));
2742 local_control.sframe = 1;
2743 local_control.super = L2CAP_SUPER_RR;
2744 local_control.poll = 1;
2745 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2746 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2747
2748 chan->retry_count = 1;
2749 __set_monitor_timer(chan);
2750 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2751 }
2752 break;
2753 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2754 l2cap_process_reqseq(chan, control->reqseq);
2755
2756 /* Fall through */
2757
2758 case L2CAP_EV_RECV_FBIT:
2759 if (control && control->final) {
2760 __clear_monitor_timer(chan);
2761 if (chan->unacked_frames > 0)
2762 __set_retrans_timer(chan);
2763 chan->retry_count = 0;
2764 chan->tx_state = L2CAP_TX_STATE_XMIT;
2765 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2766 }
2767 break;
2768 case L2CAP_EV_EXPLICIT_POLL:
2769 /* Ignore */
2770 break;
2771 case L2CAP_EV_MONITOR_TO:
2772 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2773 l2cap_send_rr_or_rnr(chan, 1);
2774 __set_monitor_timer(chan);
2775 chan->retry_count++;
2776 } else {
5e4e3972 2777 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2778 }
2779 break;
2780 default:
2781 break;
2782 }
608bcc6d
MM		 2783}
2784
d660366d
GP		 2785static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2786 struct sk_buff_head *skbs, u8 event)
608bcc6d 2787{
608bcc6d
MM		 2788 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2789 chan, control, skbs, event, chan->tx_state);
2790
2791 switch (chan->tx_state) {
2792 case L2CAP_TX_STATE_XMIT:
d660366d 2793 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2794 break;
2795 case L2CAP_TX_STATE_WAIT_F:
d660366d 2796 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2797 break;
2798 default:
2799 /* Ignore event */
2800 break;
2801 }
608bcc6d
MM		 2802}
2803
4b51dae9
MM		 2804static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2805 struct l2cap_ctrl *control)
2806{
2807 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2808 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2809}
2810
f80842a8
MM		 2811static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2812 struct l2cap_ctrl *control)
2813{
2814 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2815 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2816}
2817
1da177e4
LT		 2818/* Copy frame to all raw sockets on that connection */
2819static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2820{
1da177e4 2821 struct sk_buff *nskb;
48454079 2822 struct l2cap_chan *chan;
1da177e4
LT		 2823
2824 BT_DBG("conn %p", conn);
2825
3df91ea2 2826 mutex_lock(&conn->chan_lock);
3d57dc68 2827
3df91ea2 2828 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2829 struct sock *sk = chan->sk;
715ec005 2830 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2831 continue;
2832
2833 /* Don't send frame to the socket it came from */
2834 if (skb->sk == sk)
2835 continue;
8bcde1f2 2836 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2837 if (!nskb)
1da177e4
LT		 2838 continue;
2839
80b98027 2840 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2841 kfree_skb(nskb);
2842 }
3d57dc68 2843
3df91ea2 2844 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2845}
2846
2847/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2848static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2849 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2850{
2851 struct sk_buff *skb, **frag;
2852 struct l2cap_cmd_hdr *cmd;
2853 struct l2cap_hdr *lh;
2854 int len, count;
2855
b4400672
AE		 2856 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2857 conn, code, ident, dlen);
1da177e4 2858
300b962e
AL		 2859 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2860 return NULL;
2861
1da177e4
LT		 2862 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2863 count = min_t(unsigned int, conn->mtu, len);
2864
8bcde1f2 2865 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2866 if (!skb)
2867 return NULL;
2868
2869 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2870 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2871
2872 if (conn->hcon->type == LE_LINK)
ac73498c 2873 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2874 else
ac73498c 2875 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2876
2877 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2878 cmd->code = code;
2879 cmd->ident = ident;
aca3192c 2880 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2881
2882 if (dlen) {
2883 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2884 memcpy(skb_put(skb, count), data, count);
2885 data += count;
2886 }
2887
2888 len -= skb->len;
2889
2890 /* Continuation fragments (no L2CAP header) */
2891 frag = &skb_shinfo(skb)->frag_list;
2892 while (len) {
2893 count = min_t(unsigned int, conn->mtu, len);
2894
8bcde1f2 2895 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2896 if (!*frag)
2897 goto fail;
2898
2899 memcpy(skb_put(*frag, count), data, count);
2900
2901 len -= count;
2902 data += count;
2903
2904 frag = &(*frag)->next;
2905 }
2906
2907 return skb;
2908
2909fail:
2910 kfree_skb(skb);
2911 return NULL;
2912}
2913
2d792818
GP		 2914static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2915 unsigned long *val)
1da177e4
LT		 2916{
2917 struct l2cap_conf_opt *opt = *ptr;
2918 int len;
2919
2920 len = L2CAP_CONF_OPT_SIZE + opt->len;
2921 *ptr += len;
2922
2923 *type = opt->type;
2924 *olen = opt->len;
2925
2926 switch (opt->len) {
2927 case 1:
2928 *val = *((u8 *) opt->val);
2929 break;
2930
2931 case 2:
bfaaeb3e 2932 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2933 break;
2934
2935 case 4:
bfaaeb3e 2936 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2937 break;
2938
2939 default:
2940 *val = (unsigned long) opt->val;
2941 break;
2942 }
2943
b4400672 2944 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2945 return len;
2946}
2947
1da177e4
LT		 2948static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2949{
2950 struct l2cap_conf_opt *opt = *ptr;
2951
b4400672 2952 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2953
2954 opt->type = type;
2955 opt->len = len;
2956
2957 switch (len) {
2958 case 1:
2959 *((u8 *) opt->val) = val;
2960 break;
2961
2962 case 2:
4f8b691c 2963 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2964 break;
2965
2966 case 4:
4f8b691c 2967 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2968 break;
2969
2970 default:
2971 memcpy(opt->val, (void *) val, len);
2972 break;
2973 }
2974
2975 *ptr += L2CAP_CONF_OPT_SIZE + len;
2976}
2977
f89cef09
AE		 2978static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2979{
2980 struct l2cap_conf_efs efs;
2981
1ec918ce 2982 switch (chan->mode) {
f89cef09
AE		 2983 case L2CAP_MODE_ERTM:
2984 efs.id = chan->local_id;
2985 efs.stype = chan->local_stype;
2986 efs.msdu = cpu_to_le16(chan->local_msdu);
2987 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 2988 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 2989 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 2990 break;
2991
2992 case L2CAP_MODE_STREAMING:
2993 efs.id = 1;
2994 efs.stype = L2CAP_SERV_BESTEFFORT;
2995 efs.msdu = cpu_to_le16(chan->local_msdu);
2996 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2997 efs.acc_lat = 0;
2998 efs.flush_to = 0;
2999 break;
3000
3001 default:
3002 return;
3003 }
3004
3005 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3006 (unsigned long) &efs);
f89cef09
AE		 3007}
3008
721c4181 3009static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3010{
721c4181 3011 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3012 ack_timer.work);
3013 u16 frames_to_ack;
c1b4f43b 3014
2fb9b3d4
GP		 3015 BT_DBG("chan %p", chan);
3016
6be36555
AE		 3017 l2cap_chan_lock(chan);
3018
0362520b
MM		 3019 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3020 chan->last_acked_seq);
6be36555 3021
0362520b
MM		 3022 if (frames_to_ack)
3023 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3024
0362520b 3025 l2cap_chan_unlock(chan);
09bfb2ee 3026 l2cap_chan_put(chan);
c1b4f43b
GP		 3027}
3028
466f8004 3029int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3030{
3c588192
MM		 3031 int err;
3032
105bdf9e
MM		 3033 chan->next_tx_seq = 0;
3034 chan->expected_tx_seq = 0;
42e5c802 3035 chan->expected_ack_seq = 0;
6a026610 3036 chan->unacked_frames = 0;
42e5c802 3037 chan->buffer_seq = 0;
6a026610 3038 chan->frames_sent = 0;
105bdf9e
MM		 3039 chan->last_acked_seq = 0;
3040 chan->sdu = NULL;
3041 chan->sdu_last_frag = NULL;
3042 chan->sdu_len = 0;
3043
d34c34fb
MM		 3044 skb_queue_head_init(&chan->tx_q);
3045
08333283
MM		 3046 chan->local_amp_id = 0;
3047 chan->move_id = 0;
3048 chan->move_state = L2CAP_MOVE_STABLE;
3049 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3050
105bdf9e
MM		 3051 if (chan->mode != L2CAP_MODE_ERTM)
3052 return 0;
3053
3054 chan->rx_state = L2CAP_RX_STATE_RECV;
3055 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3056
721c4181
GP		 3057 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3058 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3059 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3060
f1c6775b 3061 skb_queue_head_init(&chan->srej_q);
1890d36b 3062
3c588192
MM		 3063 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3064 if (err < 0)
3065 return err;
3066
9dc9affc
MM		 3067 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3068 if (err < 0)
3069 l2cap_seq_list_free(&chan->srej_list);
3070
3071 return err;
0565c1c2
GP		 3072}
3073
f2fcfcd6
GP		 3074static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3075{
3076 switch (mode) {
3077 case L2CAP_MODE_STREAMING:
3078 case L2CAP_MODE_ERTM:
3079 if (l2cap_mode_supported(mode, remote_feat_mask))
3080 return mode;
3081 /* fall through */
3082 default:
3083 return L2CAP_MODE_BASIC;
3084 }
3085}
3086
6327eb98
AE		 3087static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
3088{
3089 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
3090}
3091
f89cef09
AE		 3092static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
3093{
3094 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
3095}
3096
36c86c85
MM		 3097static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3098 struct l2cap_conf_rfc *rfc)
3099{
3100 if (chan->local_amp_id && chan->hs_hcon) {
3101 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3102
3103 /* Class 1 devices have must have ERTM timeouts
3104 * exceeding the Link Supervision Timeout. The
3105 * default Link Supervision Timeout for AMP
3106 * controllers is 10 seconds.
3107 *
3108 * Class 1 devices use 0xffffffff for their
3109 * best-effort flush timeout, so the clamping logic
3110 * will result in a timeout that meets the above
3111 * requirement. ERTM timeouts are 16-bit values, so
3112 * the maximum timeout is 65.535 seconds.
3113 */
3114
3115 /* Convert timeout to milliseconds and round */
3116 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3117
3118 /* This is the recommended formula for class 2 devices
3119 * that start ERTM timers when packets are sent to the
3120 * controller.
3121 */
3122 ertm_to = 3 * ertm_to + 500;
3123
3124 if (ertm_to > 0xffff)
3125 ertm_to = 0xffff;
3126
3127 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3128 rfc->monitor_timeout = rfc->retrans_timeout;
3129 } else {
3130 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3131 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3132 }
3133}
3134
6327eb98
AE		 3135static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3136{
3137 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
2d792818 3138 __l2cap_ews_supported(chan)) {
6327eb98
AE		 3139 /* use extended control field */
3140 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3141 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3142 } else {
6327eb98 3143 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3144 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3145 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3146 }
c20f8e35 3147 chan->ack_win = chan->tx_win;
6327eb98
AE		 3148}
3149
710f9b0a 3150static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3151{
1da177e4 3152 struct l2cap_conf_req *req = data;
0c1bc5c6 3153 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3154 void *ptr = req->data;
c8f79162 3155 u16 size;
1da177e4 3156
49208c9c 3157 BT_DBG("chan %p", chan);
1da177e4 3158
73ffa904 3159 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3160 goto done;
3161
0c1bc5c6 3162 switch (chan->mode) {
f2fcfcd6
GP		 3163 case L2CAP_MODE_STREAMING:
3164 case L2CAP_MODE_ERTM:
c1360a1c 3165 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3166 break;
85eb53c6 3167
f89cef09
AE		 3168 if (__l2cap_efs_supported(chan))
3169 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3170
2ba13ed6 3171 /* fall through */
f2fcfcd6 3172 default:
8c1d787b 3173 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3174 break;
3175 }
3176
3177done:
0c1bc5c6
GP		 3178 if (chan->imtu != L2CAP_DEFAULT_MTU)
3179 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3180
0c1bc5c6 3181 switch (chan->mode) {
65c7c491 3182 case L2CAP_MODE_BASIC:
8c1d787b 3183 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3184 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3185 break;
3186
62547752
GP		 3187 rfc.mode = L2CAP_MODE_BASIC;
3188 rfc.txwin_size = 0;
3189 rfc.max_transmit = 0;
3190 rfc.retrans_timeout = 0;
3191 rfc.monitor_timeout = 0;
3192 rfc.max_pdu_size = 0;
3193
63406504 3194 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3195 (unsigned long) &rfc);
65c7c491
MH		 3196 break;
3197
3198 case L2CAP_MODE_ERTM:
3199 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3200 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3201
3202 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3203
3204 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3205 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3206 L2CAP_FCS_SIZE);
c8f79162 3207 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3208
6327eb98
AE		 3209 l2cap_txwin_setup(chan);
3210
3211 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3212 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3213
63406504 3214 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3215 (unsigned long) &rfc);
63406504 3216
f89cef09
AE		 3217 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3218 l2cap_add_opt_efs(&ptr, chan);
3219
6327eb98
AE		 3220 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3221 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3222 chan->tx_win);
60918918
AE		 3223
3224 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3225 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3226 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3227 chan->fcs = L2CAP_FCS_NONE;
3228 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3229 chan->fcs);
3230 }
f2fcfcd6
GP		 3231 break;
3232
3233 case L2CAP_MODE_STREAMING:
273759e2 3234 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3235 rfc.mode = L2CAP_MODE_STREAMING;
3236 rfc.txwin_size = 0;
3237 rfc.max_transmit = 0;
3238 rfc.retrans_timeout = 0;
3239 rfc.monitor_timeout = 0;
c8f79162
AE		 3240
3241 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3242 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3243 L2CAP_FCS_SIZE);
c8f79162 3244 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3245
63406504 3246 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3247 (unsigned long) &rfc);
63406504 3248
f89cef09
AE		 3249 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3250 l2cap_add_opt_efs(&ptr, chan);
3251
60918918
AE		 3252 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3253 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3254 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3255 chan->fcs = L2CAP_FCS_NONE;
3256 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3257 chan->fcs);
3258 }
65c7c491
MH		 3259 break;
3260 }
1da177e4 3261
fe4128e0 3262 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3263 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3264
3265 return ptr - data;
3266}
3267
73ffa904 3268static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3269{
5dee9e7c
MH		 3270 struct l2cap_conf_rsp *rsp = data;
3271 void *ptr = rsp->data;
73ffa904
GP		 3272 void *req = chan->conf_req;
3273 int len = chan->conf_len;
5dee9e7c
MH		 3274 int type, hint, olen;
3275 unsigned long val;
6464f35f 3276 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3277 struct l2cap_conf_efs efs;
3278 u8 remote_efs = 0;
861d6882 3279 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3280 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3281 u16 size;
1da177e4 3282
73ffa904 3283 BT_DBG("chan %p", chan);
820ae1b8 3284
5dee9e7c
MH		 3285 while (len >= L2CAP_CONF_OPT_SIZE) {
3286 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3287
589d2746 3288 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3289 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3290
3291 switch (type) {
3292 case L2CAP_CONF_MTU:
861d6882 3293 mtu = val;
5dee9e7c
MH		 3294 break;
3295
3296 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3297 chan->flush_to = val;
5dee9e7c
MH		 3298 break;
3299
3300 case L2CAP_CONF_QOS:
3301 break;
3302
6464f35f
MH		 3303 case L2CAP_CONF_RFC:
3304 if (olen == sizeof(rfc))
3305 memcpy(&rfc, (void *) val, olen);
3306 break;
3307
fcc203c3
GP		 3308 case L2CAP_CONF_FCS:
3309 if (val == L2CAP_FCS_NONE)
f2592d3e 3310 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3311 break;
fcc203c3 3312
42dceae2
AE		 3313 case L2CAP_CONF_EFS:
3314 remote_efs = 1;
3315 if (olen == sizeof(efs))
3316 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3317 break;
3318
6327eb98
AE		 3319 case L2CAP_CONF_EWS:
3320 if (!enable_hs)
3321 return -ECONNREFUSED;
fcc203c3 3322
6327eb98
AE		 3323 set_bit(FLAG_EXT_CTRL, &chan->flags);
3324 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3325 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3326 chan->remote_tx_win = val;
fcc203c3
GP		 3327 break;
3328
5dee9e7c
MH		 3329 default:
3330 if (hint)
3331 break;
3332
3333 result = L2CAP_CONF_UNKNOWN;
3334 *((u8 *) ptr++) = type;
3335 break;
3336 }
3337 }
3338
73ffa904 3339 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3340 goto done;
3341
0c1bc5c6 3342 switch (chan->mode) {
f2fcfcd6
GP		 3343 case L2CAP_MODE_STREAMING:
3344 case L2CAP_MODE_ERTM:
c1360a1c 3345 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3346 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3347 chan->conn->feat_mask);
85eb53c6
GP		 3348 break;
3349 }
3350
42dceae2
AE		 3351 if (remote_efs) {
3352 if (__l2cap_efs_supported(chan))
3353 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3354 else
3355 return -ECONNREFUSED;
3356 }
3357
0c1bc5c6 3358 if (chan->mode != rfc.mode)
f2fcfcd6 3359 return -ECONNREFUSED;
742e519b 3360
f2fcfcd6 3361 break;
f2fcfcd6
GP		 3362 }
3363
3364done:
0c1bc5c6 3365 if (chan->mode != rfc.mode) {
f2fcfcd6 3366 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3367 rfc.mode = chan->mode;
f2fcfcd6 3368
73ffa904 3369 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3370 return -ECONNREFUSED;
3371
2d792818
GP		 3372 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3373 (unsigned long) &rfc);
f2fcfcd6
GP		 3374 }
3375
5dee9e7c
MH		 3376 if (result == L2CAP_CONF_SUCCESS) {
3377 /* Configure output options and let the other side know
3378 * which ones we don't like. */
3379
f2fcfcd6
GP		 3380 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3381 result = L2CAP_CONF_UNACCEPT;
3382 else {
0c1bc5c6 3383 chan->omtu = mtu;
c1360a1c 3384 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3385 }
0c1bc5c6 3386 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3387
42dceae2
AE		 3388 if (remote_efs) {
3389 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3390 efs.stype != L2CAP_SERV_NOTRAFIC &&
3391 efs.stype != chan->local_stype) {
42dceae2
AE		 3392
3393 result = L2CAP_CONF_UNACCEPT;
3394
3395 if (chan->num_conf_req >= 1)
3396 return -ECONNREFUSED;
3397
3398 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3399 sizeof(efs),
3400 (unsigned long) &efs);
0e8b207e 3401 } else {
3e6b3b95 3402 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3403 result = L2CAP_CONF_PENDING;
3404 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3405 }
3406 }
3407
f2fcfcd6
GP		 3408 switch (rfc.mode) {
3409 case L2CAP_MODE_BASIC:
47d1ec61 3410 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3411 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3412 break;
3413
3414 case L2CAP_MODE_ERTM:
6327eb98
AE		 3415 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3416 chan->remote_tx_win = rfc.txwin_size;
3417 else
3418 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3419
2c03a7a4 3420 chan->remote_max_tx = rfc.max_transmit;
1c762159 3421
c8f79162 3422 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3423 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3424 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3425 rfc.max_pdu_size = cpu_to_le16(size);
3426 chan->remote_mps = size;
f2fcfcd6 3427
36c86c85 3428 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3429
c1360a1c 3430 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3431
3432 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3433 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3434
42dceae2
AE		 3435 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3436 chan->remote_id = efs.id;
3437 chan->remote_stype = efs.stype;
3438 chan->remote_msdu = le16_to_cpu(efs.msdu);
3439 chan->remote_flush_to =
2d792818 3440 le32_to_cpu(efs.flush_to);
42dceae2 3441 chan->remote_acc_lat =
2d792818 3442 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3443 chan->remote_sdu_itime =
3444 le32_to_cpu(efs.sdu_itime);
3445 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3446 sizeof(efs),
3447 (unsigned long) &efs);
42dceae2 3448 }
f2fcfcd6
GP		 3449 break;
3450
3451 case L2CAP_MODE_STREAMING:
c8f79162 3452 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3453 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3454 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3455 rfc.max_pdu_size = cpu_to_le16(size);
3456 chan->remote_mps = size;
f2fcfcd6 3457
c1360a1c 3458 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3459
2d792818
GP		 3460 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3461 (unsigned long) &rfc);
68ae6639 3462
f2fcfcd6
GP		 3463 break;
3464
3465 default:
5dee9e7c 3466 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3467
6464f35f 3468 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3469 rfc.mode = chan->mode;
f2fcfcd6 3470 }
6464f35f 3471
f2fcfcd6 3472 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3473 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3474 }
fe4128e0 3475 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3476 rsp->result = cpu_to_le16(result);
59e54bd1 3477 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3478
3479 return ptr - data;
1da177e4
LT		 3480}
3481
2d792818
GP		 3482static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3483 void *data, u16 *result)
f2fcfcd6 3484{
f2fcfcd6
GP		 3485 struct l2cap_conf_req *req = data;
3486 void *ptr = req->data;
3487 int type, olen;
3488 unsigned long val;
36e999a8 3489 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3490 struct l2cap_conf_efs efs;
f2fcfcd6 3491
fe4128e0 3492 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3493
3494 while (len >= L2CAP_CONF_OPT_SIZE) {
3495 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3496
3497 switch (type) {
3498 case L2CAP_CONF_MTU:
3499 if (val < L2CAP_DEFAULT_MIN_MTU) {
3500 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3501 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3502 } else
0c1bc5c6
GP		 3503 chan->imtu = val;
3504 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3505 break;
3506
3507 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3508 chan->flush_to = val;
f2fcfcd6 3509 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3510 2, chan->flush_to);
f2fcfcd6
GP		 3511 break;
3512
3513 case L2CAP_CONF_RFC:
3514 if (olen == sizeof(rfc))
3515 memcpy(&rfc, (void *)val, olen);
3516
c1360a1c 3517 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3518 rfc.mode != chan->mode)
f2fcfcd6
GP		 3519 return -ECONNREFUSED;
3520
47d1ec61 3521 chan->fcs = 0;
f2fcfcd6
GP		 3522
3523 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3524 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3525 break;
6327eb98
AE		 3526
3527 case L2CAP_CONF_EWS:
c20f8e35 3528 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3529 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3530 chan->tx_win);
6327eb98 3531 break;
66af7aaf
AE		 3532
3533 case L2CAP_CONF_EFS:
3534 if (olen == sizeof(efs))
3535 memcpy(&efs, (void *)val, olen);
3536
3537 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3538 efs.stype != L2CAP_SERV_NOTRAFIC &&
3539 efs.stype != chan->local_stype)
66af7aaf
AE		 3540 return -ECONNREFUSED;
3541
2d792818
GP		 3542 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3543 (unsigned long) &efs);
66af7aaf 3544 break;
cbabee78
AE		 3545
3546 case L2CAP_CONF_FCS:
3547 if (*result == L2CAP_CONF_PENDING)
3548 if (val == L2CAP_FCS_NONE)
f2592d3e 3549 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3550 &chan->conf_state);
3551 break;
f2fcfcd6
GP		 3552 }
3553 }
3554
0c1bc5c6 3555 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3556 return -ECONNREFUSED;
3557
0c1bc5c6 3558 chan->mode = rfc.mode;
6c2ea7a8 3559
0e8b207e 3560 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3561 switch (rfc.mode) {
3562 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3563 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3564 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3565 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3566 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3567 chan->ack_win = min_t(u16, chan->ack_win,
3568 rfc.txwin_size);
66af7aaf
AE		 3569
3570 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3571 chan->local_msdu = le16_to_cpu(efs.msdu);
3572 chan->local_sdu_itime =
2d792818 3573 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3574 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3575 chan->local_flush_to =
2d792818 3576 le32_to_cpu(efs.flush_to);
66af7aaf 3577 }
f2fcfcd6 3578 break;
66af7aaf 3579
f2fcfcd6 3580 case L2CAP_MODE_STREAMING:
47d1ec61 3581 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3582 }
3583 }
3584
fe4128e0 3585 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3586 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3587
3588 return ptr - data;
3589}
3590
2d792818
GP		 3591static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3592 u16 result, u16 flags)
1da177e4
LT		 3593{
3594 struct l2cap_conf_rsp *rsp = data;
3595 void *ptr = rsp->data;
1da177e4 3596
fe4128e0 3597 BT_DBG("chan %p", chan);
1da177e4 3598
fe4128e0 3599 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3600 rsp->result = cpu_to_le16(result);
aca3192c 3601 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3602
3603 return ptr - data;
3604}
3605
8c1d787b 3606void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3607{
3608 struct l2cap_conn_rsp rsp;
8c1d787b 3609 struct l2cap_conn *conn = chan->conn;
710f9b0a 3610 u8 buf[128];
439f34ac 3611 u8 rsp_code;
710f9b0a 3612
fe4128e0
GP		 3613 rsp.scid = cpu_to_le16(chan->dcid);
3614 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3615 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3616 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3617
3618 if (chan->hs_hcon)
3619 rsp_code = L2CAP_CREATE_CHAN_RSP;
3620 else
3621 rsp_code = L2CAP_CONN_RSP;
3622
3623 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3624
3625 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3626
c1360a1c 3627 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3628 return;
3629
710f9b0a 3630 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3631 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3632 chan->num_conf_req++;
3633}
3634
47d1ec61 3635static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3636{
7b1c0049
GP		 3637 int type, olen;
3638 unsigned long val;
c20f8e35
MM		 3639 /* Use sane default values in case a misbehaving remote device
3640 * did not send an RFC or extended window size option.
3641 */
3642 u16 txwin_ext = chan->ack_win;
3643 struct l2cap_conf_rfc rfc = {
3644 .mode = chan->mode,
3645 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3646 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3647 .max_pdu_size = cpu_to_le16(chan->imtu),
3648 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3649 };
7b1c0049 3650
47d1ec61 3651 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3652
0c1bc5c6 3653 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3654 return;
3655
3656 while (len >= L2CAP_CONF_OPT_SIZE) {
3657 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3658
c20f8e35
MM		 3659 switch (type) {
3660 case L2CAP_CONF_RFC:
3661 if (olen == sizeof(rfc))
3662 memcpy(&rfc, (void *)val, olen);
8f321f85 3663 break;
c20f8e35
MM		 3664 case L2CAP_CONF_EWS:
3665 txwin_ext = val;
3666 break;
3667 }
7b1c0049
GP		 3668 }
3669
7b1c0049
GP		 3670 switch (rfc.mode) {
3671 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3672 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3673 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3674 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3675 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3676 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3677 else
3678 chan->ack_win = min_t(u16, chan->ack_win,
3679 rfc.txwin_size);
7b1c0049
GP		 3680 break;
3681 case L2CAP_MODE_STREAMING:
47d1ec61 3682 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3683 }
3684}
3685
2d792818 3686static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3687 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3688 u8 *data)
4e8402a3 3689{
e2fd318e 3690 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3691
cb3b3152
JH		 3692 if (cmd_len < sizeof(*rej))
3693 return -EPROTO;
3694
e2fd318e 3695 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3696 return 0;
3697
3698 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3699 cmd->ident == conn->info_ident) {
17cd3f37 3700 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3701
3702 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3703 conn->info_ident = 0;
984947dc 3704
4e8402a3
MH		 3705 l2cap_conn_start(conn);
3706 }
3707
3708 return 0;
3709}
3710
1700915f
MM		 3711static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3712 struct l2cap_cmd_hdr *cmd,
3713 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3714{
1da177e4
LT		 3715 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3716 struct l2cap_conn_rsp rsp;
23691d75 3717 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3718 struct sock *parent, *sk = NULL;
e7c29cb1 3719 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3720
3721 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3722 __le16 psm = req->psm;
1da177e4 3723
097db76c 3724 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3725
3726 /* Check if we have socket listening on psm */
c2287681 3727 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 3728 if (!pchan) {
1da177e4
LT		 3729 result = L2CAP_CR_BAD_PSM;
3730 goto sendresp;
3731 }
3732
23691d75
GP		 3733 parent = pchan->sk;
3734
3df91ea2 3735 mutex_lock(&conn->chan_lock);
aa2ac881 3736 lock_sock(parent);
e0f0cb56 3737
e7c29cb1 3738 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3739 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3740 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3741 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3742 result = L2CAP_CR_SEC_BLOCK;
3743 goto response;
3744 }
3745
1da177e4
LT		 3746 result = L2CAP_CR_NO_MEM;
3747
2dfa1003
GP		 3748 /* Check if we already have channel with that dcid */
3749 if (__l2cap_get_chan_by_dcid(conn, scid))
3750 goto response;
3751
80b98027 3752 chan = pchan->ops->new_connection(pchan);
80808e43 3753 if (!chan)
1da177e4
LT		 3754 goto response;
3755
80808e43
GP		 3756 sk = chan->sk;
3757
1da177e4
LT		 3758 bacpy(&bt_sk(sk)->src, conn->src);
3759 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3760 chan->psm = psm;
3761 chan->dcid = scid;
1700915f 3762 chan->local_amp_id = amp_id;
1da177e4 3763
6be36555 3764 __l2cap_chan_add(conn, chan);
48454079 3765
fe4128e0 3766 dcid = chan->scid;
1da177e4 3767
c9b66675 3768 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3769
fc7f8a7e 3770 chan->ident = cmd->ident;
1da177e4 3771
984947dc 3772 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3773 if (l2cap_chan_check_security(chan)) {
c5daa683 3774 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
0e587be7 3775 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3776 result = L2CAP_CR_PEND;
3777 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3778 chan->ops->defer(chan);
f66dc81f 3779 } else {
1700915f
MM		 3780 /* Force pending result for AMP controllers.
3781 * The connection will succeed after the
3782 * physical link is up.
3783 */
3784 if (amp_id) {
3785 __l2cap_state_change(chan, BT_CONNECT2);
3786 result = L2CAP_CR_PEND;
3787 } else {
3788 __l2cap_state_change(chan, BT_CONFIG);
3789 result = L2CAP_CR_SUCCESS;
3790 }
f66dc81f
MH		 3791 status = L2CAP_CS_NO_INFO;
3792 }
79d554a6 3793 } else {
0e587be7 3794 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3795 result = L2CAP_CR_PEND;
3796 status = L2CAP_CS_AUTHEN_PEND;
3797 }
3798 } else {
0e587be7 3799 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3800 result = L2CAP_CR_PEND;
3801 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3802 }
3803
1da177e4 3804response:
aa2ac881 3805 release_sock(parent);
3df91ea2 3806 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3807
3808sendresp:
aca3192c
YH		 3809 rsp.scid = cpu_to_le16(scid);
3810 rsp.dcid = cpu_to_le16(dcid);
3811 rsp.result = cpu_to_le16(result);
3812 rsp.status = cpu_to_le16(status);
4c89b6aa 3813 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3814
3815 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3816 struct l2cap_info_req info;
ac73498c 3817 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3818
3819 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3820 conn->info_ident = l2cap_get_ident(conn);
3821
ba13ccd9 3822 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3823
2d792818
GP		 3824 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3825 sizeof(info), &info);
79d554a6
MH		 3826 }
3827
c1360a1c 3828 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3829 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3830 u8 buf[128];
c1360a1c 3831 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3832 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3833 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3834 chan->num_conf_req++;
e9aeb2dd 3835 }
1700915f
MM		 3836
3837 return chan;
4c89b6aa 3838}
e9aeb2dd 3839
4c89b6aa 3840static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3841 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3842{
7b064eda
JK		 3843 struct hci_dev *hdev = conn->hcon->hdev;
3844 struct hci_conn *hcon = conn->hcon;
3845
cb3b3152
JH		 3846 if (cmd_len < sizeof(struct l2cap_conn_req))
3847 return -EPROTO;
3848
7b064eda
JK		 3849 hci_dev_lock(hdev);
3850 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3851 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3852 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3853 hcon->dst_type, 0, NULL, 0,
3854 hcon->dev_class);
3855 hci_dev_unlock(hdev);
3856
300229f9 3857 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3858 return 0;
3859}
3860
5909cf30 3861static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3862 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3863 u8 *data)
1da177e4
LT		 3864{
3865 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3866 u16 scid, dcid, result, status;
48454079 3867 struct l2cap_chan *chan;
1da177e4 3868 u8 req[128];
3df91ea2 3869 int err;
1da177e4 3870
cb3b3152
JH		 3871 if (cmd_len < sizeof(*rsp))
3872 return -EPROTO;
3873
1da177e4
LT		 3874 scid = __le16_to_cpu(rsp->scid);
3875 dcid = __le16_to_cpu(rsp->dcid);
3876 result = __le16_to_cpu(rsp->result);
3877 status = __le16_to_cpu(rsp->status);
3878
1b009c98 3879 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3880 dcid, scid, result, status);
1da177e4 3881
3df91ea2
AE		 3882 mutex_lock(&conn->chan_lock);
3883
1da177e4 3884 if (scid) {
3df91ea2
AE		 3885 chan = __l2cap_get_chan_by_scid(conn, scid);
3886 if (!chan) {
3887 err = -EFAULT;
3888 goto unlock;
3889 }
1da177e4 3890 } else {
3df91ea2
AE		 3891 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3892 if (!chan) {
3893 err = -EFAULT;
3894 goto unlock;
3895 }
1da177e4
LT		 3896 }
3897
3df91ea2
AE		 3898 err = 0;
3899
6be36555 3900 l2cap_chan_lock(chan);
48454079 3901
1da177e4
LT		 3902 switch (result) {
3903 case L2CAP_CR_SUCCESS:
89bc500e 3904 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3905 chan->ident = 0;
fe4128e0 3906 chan->dcid = dcid;
c1360a1c 3907 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3908
c1360a1c 3909 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3910 break;
3911
1da177e4 3912 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3913 l2cap_build_conf_req(chan, req), req);
73ffa904 3914 chan->num_conf_req++;
1da177e4
LT		 3915 break;
3916
3917 case L2CAP_CR_PEND:
c1360a1c 3918 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3919 break;
3920
3921 default:
48454079 3922 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3923 break;
3924 }
3925
6be36555 3926 l2cap_chan_unlock(chan);
3df91ea2
AE		 3927
3928unlock:
3929 mutex_unlock(&conn->chan_lock);
3930
3931 return err;
1da177e4
LT		 3932}
3933
47d1ec61 3934static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3935{
3936 /* FCS is enabled only in ERTM or streaming mode, if one or both
3937 * sides request it.
3938 */
0c1bc5c6 3939 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3940 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3941 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3942 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3943}
3944
29d8a590
AE		 3945static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3946 u8 ident, u16 flags)
3947{
3948 struct l2cap_conn *conn = chan->conn;
3949
3950 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3951 flags);
3952
3953 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3954 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3955
3956 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3957 l2cap_build_conf_rsp(chan, data,
3958 L2CAP_CONF_SUCCESS, flags), data);
3959}
3960
2d792818
GP		 3961static inline int l2cap_config_req(struct l2cap_conn *conn,
3962 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3963 u8 *data)
1da177e4
LT		 3964{
3965 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3966 u16 dcid, flags;
3967 u8 rsp[64];
48454079 3968 struct l2cap_chan *chan;
3c588192 3969 int len, err = 0;
1da177e4 3970
cb3b3152
JH		 3971 if (cmd_len < sizeof(*req))
3972 return -EPROTO;
3973
1da177e4
LT		 3974 dcid = __le16_to_cpu(req->dcid);
3975 flags = __le16_to_cpu(req->flags);
3976
3977 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3978
baa7e1fa 3979 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3980 if (!chan)
1da177e4
LT		 3981 return -ENOENT;
3982
033b1142 3983 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3984 struct l2cap_cmd_rej_cid rej;
3985
ac73498c 3986 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
e2fd318e
IK		 3987 rej.scid = cpu_to_le16(chan->scid);
3988 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3989
df6bd743 3990 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2d792818 3991 sizeof(rej), &rej);
354f60a9 3992 goto unlock;
df6bd743 3993 }
354f60a9 3994
5dee9e7c 3995 /* Reject if config buffer is too small. */
88219a0f 3996 len = cmd_len - sizeof(*req);
cb3b3152 3997 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3998 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 3999 l2cap_build_conf_rsp(chan, rsp,
4000 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4001 goto unlock;
4002 }
4003
4004 /* Store config. */
73ffa904
GP		 4005 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4006 chan->conf_len += len;
1da177e4 4007
59e54bd1 4008 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4009 /* Incomplete config. Send empty response. */
4010 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4011 l2cap_build_conf_rsp(chan, rsp,
4012 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4013 goto unlock;
4014 }
4015
4016 /* Complete config. */
73ffa904 4017 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4018 if (len < 0) {
5e4e3972 4019 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4020 goto unlock;
f2fcfcd6 4021 }
1da177e4 4022
1500109b 4023 chan->ident = cmd->ident;
5dee9e7c 4024 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4025 chan->num_conf_rsp++;
5dee9e7c 4026
5dee9e7c 4027 /* Reset config buffer. */
73ffa904 4028 chan->conf_len = 0;
5dee9e7c 4029
c1360a1c 4030 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4031 goto unlock;
4032
c1360a1c 4033 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4034 set_default_fcs(chan);
fcc203c3 4035
105bdf9e
MM		 4036 if (chan->mode == L2CAP_MODE_ERTM ||
4037 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4038 err = l2cap_ertm_init(chan);
4039
4040 if (err < 0)
5e4e3972 4041 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4042 else
4043 l2cap_chan_ready(chan);
0565c1c2 4044
876d9484
MH		 4045 goto unlock;
4046 }
4047
c1360a1c 4048 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4049 u8 buf[64];
1da177e4 4050 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4051 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4052 chan->num_conf_req++;
1da177e4
LT		 4053 }
4054
0e8b207e
AE		 4055 /* Got Conf Rsp PENDING from remote side and asume we sent
4056 Conf Rsp PENDING in the code above */
4057 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4058 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4059
4060 /* check compatibility */
4061
79de886d 4062 /* Send rsp for BR/EDR channel */
f351bc72 4063 if (!chan->hs_hcon)
79de886d
AE		 4064 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4065 else
4066 chan->ident = cmd->ident;
0e8b207e
AE		 4067 }
4068
1da177e4 4069unlock:
6be36555 4070 l2cap_chan_unlock(chan);
3c588192 4071 return err;
1da177e4
LT		 4072}
4073
2d792818 4074static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4075 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4076 u8 *data)
1da177e4
LT		 4077{
4078 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4079 u16 scid, flags, result;
48454079 4080 struct l2cap_chan *chan;
cb3b3152 4081 int len = cmd_len - sizeof(*rsp);
3c588192 4082 int err = 0;
1da177e4 4083
cb3b3152
JH		 4084 if (cmd_len < sizeof(*rsp))
4085 return -EPROTO;
4086
1da177e4
LT		 4087 scid = __le16_to_cpu(rsp->scid);
4088 flags = __le16_to_cpu(rsp->flags);
4089 result = __le16_to_cpu(rsp->result);
4090
61386cba
AE		 4091 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4092 result, len);
1da177e4 4093
baa7e1fa 4094 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4095 if (!chan)
1da177e4
LT		 4096 return 0;
4097
4098 switch (result) {
4099 case L2CAP_CONF_SUCCESS:
47d1ec61 4100 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4101 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4102 break;
4103
0e8b207e
AE		 4104 case L2CAP_CONF_PENDING:
4105 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4106
4107 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4108 char buf[64];
4109
4110 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4111 buf, &result);
0e8b207e 4112 if (len < 0) {
5e4e3972 4113 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4114 goto done;
4115 }
4116
f351bc72 4117 if (!chan->hs_hcon) {
79de886d
AE		 4118 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4119 0);
5ce66b59
AE		 4120 } else {
4121 if (l2cap_check_efs(chan)) {
4122 amp_create_logical_link(chan);
4123 chan->ident = cmd->ident;
4124 }
4125 }
0e8b207e
AE		 4126 }
4127 goto done;
4128
1da177e4 4129 case L2CAP_CONF_UNACCEPT:
73ffa904 4130 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4131 char req[64];
4132
c2c77ec8 4133 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4134 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4135 goto done;
4136 }
4137
f2fcfcd6
GP		 4138 /* throw out any old stored conf requests */
4139 result = L2CAP_CONF_SUCCESS;
b4450035 4140 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4141 req, &result);
f2fcfcd6 4142 if (len < 0) {
5e4e3972 4143 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4144 goto done;
4145 }
4146
4147 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4148 L2CAP_CONF_REQ, len, req);
73ffa904 4149 chan->num_conf_req++;
f2fcfcd6
GP		 4150 if (result != L2CAP_CONF_SUCCESS)
4151 goto done;
4152 break;
1da177e4
LT		 4153 }
4154
8e87d142 4155 default:
6be36555 4156 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4157
ba13ccd9 4158 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4159 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4160 goto done;
4161 }
4162
59e54bd1 4163 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4164 goto done;
4165
c1360a1c 4166 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4167
c1360a1c 4168 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4169 set_default_fcs(chan);
fcc203c3 4170
105bdf9e
MM		 4171 if (chan->mode == L2CAP_MODE_ERTM ||
4172 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4173 err = l2cap_ertm_init(chan);
0565c1c2 4174
3c588192 4175 if (err < 0)
5e4e3972 4176 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4177 else
4178 l2cap_chan_ready(chan);
1da177e4
LT		 4179 }
4180
4181done:
6be36555 4182 l2cap_chan_unlock(chan);
3c588192 4183 return err;
1da177e4
LT		 4184}
4185
2d792818 4186static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4187 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4188 u8 *data)
1da177e4
LT		 4189{
4190 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4191 struct l2cap_disconn_rsp rsp;
4192 u16 dcid, scid;
48454079 4193 struct l2cap_chan *chan;
1da177e4
LT		 4194 struct sock *sk;
4195
cb3b3152
JH		 4196 if (cmd_len != sizeof(*req))
4197 return -EPROTO;
4198
1da177e4
LT		 4199 scid = __le16_to_cpu(req->scid);
4200 dcid = __le16_to_cpu(req->dcid);
4201
4202 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4203
3df91ea2
AE		 4204 mutex_lock(&conn->chan_lock);
4205
4206 chan = __l2cap_get_chan_by_scid(conn, dcid);
4207 if (!chan) {
4208 mutex_unlock(&conn->chan_lock);
1da177e4 4209 return 0;
3df91ea2 4210 }
1da177e4 4211
6be36555
AE		 4212 l2cap_chan_lock(chan);
4213
48454079
GP		 4214 sk = chan->sk;
4215
fe4128e0
GP		 4216 rsp.dcid = cpu_to_le16(chan->scid);
4217 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4218 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4219
6be36555 4220 lock_sock(sk);
1da177e4 4221 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 4222 release_sock(sk);
1da177e4 4223
61d6ef3e 4224 l2cap_chan_hold(chan);
48454079 4225 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4226
4227 l2cap_chan_unlock(chan);
1da177e4 4228
80b98027 4229 chan->ops->close(chan);
61d6ef3e 4230 l2cap_chan_put(chan);
3df91ea2
AE		 4231
4232 mutex_unlock(&conn->chan_lock);
4233
1da177e4
LT		 4234 return 0;
4235}
4236
2d792818 4237static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4238 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4239 u8 *data)
1da177e4
LT		 4240{
4241 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4242 u16 dcid, scid;
48454079 4243 struct l2cap_chan *chan;
1da177e4 4244
cb3b3152
JH		 4245 if (cmd_len != sizeof(*rsp))
4246 return -EPROTO;
4247
1da177e4
LT		 4248 scid = __le16_to_cpu(rsp->scid);
4249 dcid = __le16_to_cpu(rsp->dcid);
4250
4251 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4252
3df91ea2
AE		 4253 mutex_lock(&conn->chan_lock);
4254
4255 chan = __l2cap_get_chan_by_scid(conn, scid);
4256 if (!chan) {
4257 mutex_unlock(&conn->chan_lock);
1da177e4 4258 return 0;
3df91ea2 4259 }
1da177e4 4260
6be36555 4261 l2cap_chan_lock(chan);
48454079 4262
61d6ef3e 4263 l2cap_chan_hold(chan);
48454079 4264 l2cap_chan_del(chan, 0);
6be36555
AE		 4265
4266 l2cap_chan_unlock(chan);
1da177e4 4267
80b98027 4268 chan->ops->close(chan);
61d6ef3e 4269 l2cap_chan_put(chan);
3df91ea2
AE		 4270
4271 mutex_unlock(&conn->chan_lock);
4272
1da177e4
LT		 4273 return 0;
4274}
4275
2d792818 4276static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4277 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4278 u8 *data)
1da177e4
LT		 4279{
4280 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4281 u16 type;
4282
cb3b3152
JH		 4283 if (cmd_len != sizeof(*req))
4284 return -EPROTO;
4285
1da177e4
LT		 4286 type = __le16_to_cpu(req->type);
4287
4288 BT_DBG("type 0x%4.4x", type);
4289
f0709e03
MH		 4290 if (type == L2CAP_IT_FEAT_MASK) {
4291 u8 buf[8];
44dd46de 4292 u32 feat_mask = l2cap_feat_mask;
f0709e03 4293 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4294 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4295 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4296 if (!disable_ertm)
fcc203c3 4297 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4298 | L2CAP_FEAT_FCS;
a5fd6f30 4299 if (enable_hs)
6327eb98 4300 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4301 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4302
1b7bf4ed 4303 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4304 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4305 buf);
e1027a7c
MH		 4306 } else if (type == L2CAP_IT_FIXED_CHAN) {
4307 u8 buf[12];
4308 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 4309
4310 if (enable_hs)
4311 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4312 else
4313 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4314
ac73498c
AE		 4315 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4316 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4317 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4318 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4319 buf);
f0709e03
MH		 4320 } else {
4321 struct l2cap_info_rsp rsp;
4322 rsp.type = cpu_to_le16(type);
ac73498c 4323 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4324 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4325 &rsp);
f0709e03 4326 }
1da177e4
LT		 4327
4328 return 0;
4329}
4330
2d792818 4331static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4332 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4333 u8 *data)
1da177e4
LT		 4334{
4335 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4336 u16 type, result;
4337
3f6fa3d4 4338 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4339 return -EPROTO;
4340
1da177e4
LT		 4341 type = __le16_to_cpu(rsp->type);
4342 result = __le16_to_cpu(rsp->result);
4343
4344 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4345
e90165be
AE		 4346 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4347 if (cmd->ident != conn->info_ident ||
2d792818 4348 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4349 return 0;
4350
17cd3f37 4351 cancel_delayed_work(&conn->info_timer);
4e8402a3 4352
adb08ede
VT		 4353 if (result != L2CAP_IR_SUCCESS) {
4354 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4355 conn->info_ident = 0;
4356
4357 l2cap_conn_start(conn);
4358
4359 return 0;
4360 }
4361
978c93b9
AE		 4362 switch (type) {
4363 case L2CAP_IT_FEAT_MASK:
83985319 4364 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4365
47ec1dcd 4366 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4367 struct l2cap_info_req req;
ac73498c 4368 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4369
4370 conn->info_ident = l2cap_get_ident(conn);
4371
4372 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4373 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4374 } else {
4375 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4376 conn->info_ident = 0;
4377
4378 l2cap_conn_start(conn);
4379 }
978c93b9
AE		 4380 break;
4381
4382 case L2CAP_IT_FIXED_CHAN:
4383 conn->fixed_chan_mask = rsp->data[0];
984947dc 4384 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4385 conn->info_ident = 0;
984947dc
MH		 4386
4387 l2cap_conn_start(conn);
978c93b9 4388 break;
984947dc 4389 }
4e8402a3 4390
1da177e4
LT		 4391 return 0;
4392}
4393
1700915f
MM		 4394static int l2cap_create_channel_req(struct l2cap_conn *conn,
4395 struct l2cap_cmd_hdr *cmd,
4396 u16 cmd_len, void *data)
f94ff6ff
MM		 4397{
4398 struct l2cap_create_chan_req *req = data;
6e1df6a6 4399 struct l2cap_create_chan_rsp rsp;
1700915f 4400 struct l2cap_chan *chan;
6e1df6a6 4401 struct hci_dev *hdev;
f94ff6ff
MM		 4402 u16 psm, scid;
4403
4404 if (cmd_len != sizeof(*req))
4405 return -EPROTO;
4406
4407 if (!enable_hs)
4408 return -EINVAL;
4409
4410 psm = le16_to_cpu(req->psm);
4411 scid = le16_to_cpu(req->scid);
4412
ad0ac6ca 4413 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4414
6e1df6a6
AE		 4415 /* For controller id 0 make BR/EDR connection */
4416 if (req->amp_id == HCI_BREDR_ID) {
4417 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4418 req->amp_id);
4419 return 0;
4420 }
1700915f 4421
6e1df6a6
AE		 4422 /* Validate AMP controller id */
4423 hdev = hci_dev_get(req->amp_id);
4424 if (!hdev)
4425 goto error;
1700915f 4426
6e1df6a6
AE		 4427 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4428 hci_dev_put(hdev);
4429 goto error;
4430 }
1700915f 4431
6e1df6a6
AE		 4432 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4433 req->amp_id);
4434 if (chan) {
4435 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4436 struct hci_conn *hs_hcon;
1700915f 4437
6e1df6a6
AE		 4438 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst);
4439 if (!hs_hcon) {
4440 hci_dev_put(hdev);
4441 return -EFAULT;
1700915f
MM		 4442 }
4443
6e1df6a6
AE		 4444 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4445
6e1df6a6
AE		 4446 mgr->bredr_chan = chan;
4447 chan->hs_hcon = hs_hcon;
fd45bf4c 4448 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4449 conn->mtu = hdev->block_mtu;
1700915f 4450 }
f94ff6ff 4451
6e1df6a6 4452 hci_dev_put(hdev);
f94ff6ff
MM		 4453
4454 return 0;
6e1df6a6
AE		 4455
4456error:
4457 rsp.dcid = 0;
4458 rsp.scid = cpu_to_le16(scid);
4459 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4460 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4461
4462 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4463 sizeof(rsp), &rsp);
4464
dc280801 4465 return 0;
f94ff6ff
MM		 4466}
4467
8eb200bd
MM		 4468static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4469{
4470 struct l2cap_move_chan_req req;
4471 u8 ident;
4472
4473 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4474
4475 ident = l2cap_get_ident(chan->conn);
4476 chan->ident = ident;
4477
4478 req.icid = cpu_to_le16(chan->scid);
4479 req.dest_amp_id = dest_amp_id;
4480
4481 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4482 &req);
4483
4484 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4485}
4486
1500109b 4487static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4488{
4489 struct l2cap_move_chan_rsp rsp;
4490
1500109b 4491 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4492
1500109b 4493 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4494 rsp.result = cpu_to_le16(result);
4495
1500109b
MM		 4496 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4497 sizeof(rsp), &rsp);
8d5a04a1
MM		 4498}
4499
5b155ef9 4500static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4501{
4502 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4503
5b155ef9 4504 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4505
5b155ef9 4506 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4507
5b155ef9 4508 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4509 cfm.result = cpu_to_le16(result);
4510
5b155ef9
MM		 4511 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4512 sizeof(cfm), &cfm);
4513
4514 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4515}
4516
4517static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4518{
4519 struct l2cap_move_chan_cfm cfm;
4520
4521 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4522
4523 cfm.icid = cpu_to_le16(icid);
4524 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4525
4526 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4527 sizeof(cfm), &cfm);
8d5a04a1
MM		 4528}
4529
4530static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4531 u16 icid)
8d5a04a1
MM		 4532{
4533 struct l2cap_move_chan_cfm_rsp rsp;
4534
ad0ac6ca 4535 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4536
4537 rsp.icid = cpu_to_le16(icid);
4538 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4539}
4540
5f3847a4
MM		 4541static void __release_logical_link(struct l2cap_chan *chan)
4542{
4543 chan->hs_hchan = NULL;
4544 chan->hs_hcon = NULL;
4545
4546 /* Placeholder - release the logical link */
4547}
4548
1500109b
MM		 4549static void l2cap_logical_fail(struct l2cap_chan *chan)
4550{
4551 /* Logical link setup failed */
4552 if (chan->state != BT_CONNECTED) {
4553 /* Create channel failure, disconnect */
5e4e3972 4554 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4555 return;
4556 }
4557
4558 switch (chan->move_role) {
4559 case L2CAP_MOVE_ROLE_RESPONDER:
4560 l2cap_move_done(chan);
4561 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4562 break;
4563 case L2CAP_MOVE_ROLE_INITIATOR:
4564 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4565 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4566 /* Remote has only sent pending or
4567 * success responses, clean up
4568 */
4569 l2cap_move_done(chan);
4570 }
4571
4572 /* Other amp move states imply that the move
4573 * has already aborted
4574 */
4575 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4576 break;
4577 }
4578}
4579
4580static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4581 struct hci_chan *hchan)
4582{
4583 struct l2cap_conf_rsp rsp;
1500109b 4584
336178a3 4585 chan->hs_hchan = hchan;
1500109b
MM		 4586 chan->hs_hcon->l2cap_data = chan->conn;
4587
35ba9561 4588 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4589
4590 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4591 int err;
1500109b
MM		 4592
4593 set_default_fcs(chan);
4594
4595 err = l2cap_ertm_init(chan);
4596 if (err < 0)
5e4e3972 4597 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4598 else
4599 l2cap_chan_ready(chan);
4600 }
4601}
4602
4603static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4604 struct hci_chan *hchan)
4605{
4606 chan->hs_hcon = hchan->conn;
4607 chan->hs_hcon->l2cap_data = chan->conn;
4608
4609 BT_DBG("move_state %d", chan->move_state);
4610
4611 switch (chan->move_state) {
4612 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4613 /* Move confirm will be sent after a success
4614 * response is received
4615 */
4616 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4617 break;
4618 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4619 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4620 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4621 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4622 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4623 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4624 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4625 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4626 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4627 }
4628 break;
4629 default:
4630 /* Move was not in expected state, free the channel */
4631 __release_logical_link(chan);
4632
4633 chan->move_state = L2CAP_MOVE_STABLE;
4634 }
4635}
4636
4637/* Call with chan locked */
27695fb4
AE		 4638void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4639 u8 status)
5b155ef9 4640{
1500109b
MM		 4641 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4642
4643 if (status) {
4644 l2cap_logical_fail(chan);
4645 __release_logical_link(chan);
4646 return;
4647 }
4648
4649 if (chan->state != BT_CONNECTED) {
4650 /* Ignore logical link if channel is on BR/EDR */
4651 if (chan->local_amp_id)
4652 l2cap_logical_finish_create(chan, hchan);
4653 } else {
4654 l2cap_logical_finish_move(chan, hchan);
4655 }
5b155ef9
MM		 4656}
4657
3f7a56c4
MM		 4658void l2cap_move_start(struct l2cap_chan *chan)
4659{
4660 BT_DBG("chan %p", chan);
4661
4662 if (chan->local_amp_id == HCI_BREDR_ID) {
4663 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4664 return;
4665 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4666 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4667 /* Placeholder - start physical link setup */
4668 } else {
4669 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4670 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4671 chan->move_id = 0;
4672 l2cap_move_setup(chan);
4673 l2cap_send_move_chan_req(chan, 0);
4674 }
4675}
4676
8eb200bd
MM		 4677static void l2cap_do_create(struct l2cap_chan *chan, int result,
4678 u8 local_amp_id, u8 remote_amp_id)
4679{
62748ca1
AE		 4680 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4681 local_amp_id, remote_amp_id);
4682
12d6cc60
AE		 4683 chan->fcs = L2CAP_FCS_NONE;
4684
62748ca1
AE		 4685 /* Outgoing channel on AMP */
4686 if (chan->state == BT_CONNECT) {
4687 if (result == L2CAP_CR_SUCCESS) {
4688 chan->local_amp_id = local_amp_id;
4689 l2cap_send_create_chan_req(chan, remote_amp_id);
4690 } else {
4691 /* Revert to BR/EDR connect */
4692 l2cap_send_conn_req(chan);
4693 }
4694
4695 return;
4696 }
4697
4698 /* Incoming channel on AMP */
4699 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4700 struct l2cap_conn_rsp rsp;
4701 char buf[128];
4702 rsp.scid = cpu_to_le16(chan->dcid);
4703 rsp.dcid = cpu_to_le16(chan->scid);
4704
8eb200bd
MM		 4705 if (result == L2CAP_CR_SUCCESS) {
4706 /* Send successful response */
62cd50e2
AE		 4707 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4708 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4709 } else {
4710 /* Send negative response */
62cd50e2
AE		 4711 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4712 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4713 }
4714
4715 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4716 sizeof(rsp), &rsp);
4717
4718 if (result == L2CAP_CR_SUCCESS) {
4719 __l2cap_state_change(chan, BT_CONFIG);
4720 set_bit(CONF_REQ_SENT, &chan->conf_state);
4721 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4722 L2CAP_CONF_REQ,
4723 l2cap_build_conf_req(chan, buf), buf);
4724 chan->num_conf_req++;
4725 }
8eb200bd
MM		 4726 }
4727}
4728
4729static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4730 u8 remote_amp_id)
4731{
4732 l2cap_move_setup(chan);
4733 chan->move_id = local_amp_id;
4734 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4735
4736 l2cap_send_move_chan_req(chan, remote_amp_id);
4737}
4738
4739static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4740{
4741 struct hci_chan *hchan = NULL;
4742
4743 /* Placeholder - get hci_chan for logical link */
4744
4745 if (hchan) {
4746 if (hchan->state == BT_CONNECTED) {
4747 /* Logical link is ready to go */
4748 chan->hs_hcon = hchan->conn;
4749 chan->hs_hcon->l2cap_data = chan->conn;
4750 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4751 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4752
4753 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4754 } else {
4755 /* Wait for logical link to be ready */
4756 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4757 }
4758 } else {
4759 /* Logical link not available */
4760 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4761 }
4762}
4763
4764static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4765{
4766 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4767 u8 rsp_result;
4768 if (result == -EINVAL)
4769 rsp_result = L2CAP_MR_BAD_ID;
4770 else
4771 rsp_result = L2CAP_MR_NOT_ALLOWED;
4772
4773 l2cap_send_move_chan_rsp(chan, rsp_result);
4774 }
4775
4776 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4777 chan->move_state = L2CAP_MOVE_STABLE;
4778
4779 /* Restart data transmission */
4780 l2cap_ertm_send(chan);
4781}
4782
a514b17f
AE		 4783/* Invoke with locked chan */
4784void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4785{
770bfefa 4786 u8 local_amp_id = chan->local_amp_id;
fffadc08 4787 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4788
8eb200bd
MM		 4789 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4790 chan, result, local_amp_id, remote_amp_id);
4791
8eb200bd
MM		 4792 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4793 l2cap_chan_unlock(chan);
4794 return;
4795 }
4796
4797 if (chan->state != BT_CONNECTED) {
4798 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4799 } else if (result != L2CAP_MR_SUCCESS) {
4800 l2cap_do_move_cancel(chan, result);
4801 } else {
4802 switch (chan->move_role) {
4803 case L2CAP_MOVE_ROLE_INITIATOR:
4804 l2cap_do_move_initiate(chan, local_amp_id,
4805 remote_amp_id);
4806 break;
4807 case L2CAP_MOVE_ROLE_RESPONDER:
4808 l2cap_do_move_respond(chan, result);
4809 break;
4810 default:
4811 l2cap_do_move_cancel(chan, result);
4812 break;
4813 }
4814 }
8eb200bd
MM		 4815}
4816
8d5a04a1 4817static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4818 struct l2cap_cmd_hdr *cmd,
4819 u16 cmd_len, void *data)
8d5a04a1
MM		 4820{
4821 struct l2cap_move_chan_req *req = data;
1500109b 4822 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4823 struct l2cap_chan *chan;
8d5a04a1
MM		 4824 u16 icid = 0;
4825 u16 result = L2CAP_MR_NOT_ALLOWED;
4826
4827 if (cmd_len != sizeof(*req))
4828 return -EPROTO;
4829
4830 icid = le16_to_cpu(req->icid);
4831
ad0ac6ca 4832 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1
MM		 4833
4834 if (!enable_hs)
4835 return -EINVAL;
4836
02b0fbb9
MM		 4837 chan = l2cap_get_chan_by_dcid(conn, icid);
4838 if (!chan) {
1500109b
MM		 4839 rsp.icid = cpu_to_le16(icid);
4840 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4841 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4842 sizeof(rsp), &rsp);
02b0fbb9
MM		 4843 return 0;
4844 }
4845
1500109b
MM		 4846 chan->ident = cmd->ident;
4847
02b0fbb9
MM		 4848 if (chan->scid < L2CAP_CID_DYN_START ||
4849 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4850 (chan->mode != L2CAP_MODE_ERTM &&
4851 chan->mode != L2CAP_MODE_STREAMING)) {
4852 result = L2CAP_MR_NOT_ALLOWED;
4853 goto send_move_response;
4854 }
4855
4856 if (chan->local_amp_id == req->dest_amp_id) {
4857 result = L2CAP_MR_SAME_ID;
4858 goto send_move_response;
4859 }
4860
4861 if (req->dest_amp_id) {
4862 struct hci_dev *hdev;
4863 hdev = hci_dev_get(req->dest_amp_id);
4864 if (!hdev || hdev->dev_type != HCI_AMP ||
4865 !test_bit(HCI_UP, &hdev->flags)) {
4866 if (hdev)
4867 hci_dev_put(hdev);
4868
4869 result = L2CAP_MR_BAD_ID;
4870 goto send_move_response;
4871 }
4872 hci_dev_put(hdev);
4873 }
4874
4875 /* Detect a move collision. Only send a collision response
4876 * if this side has "lost", otherwise proceed with the move.
4877 * The winner has the larger bd_addr.
4878 */
4879 if ((__chan_is_moving(chan) ||
4880 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4881 bacmp(conn->src, conn->dst) > 0) {
4882 result = L2CAP_MR_COLLISION;
4883 goto send_move_response;
4884 }
4885
02b0fbb9
MM		 4886 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4887 l2cap_move_setup(chan);
4888 chan->move_id = req->dest_amp_id;
4889 icid = chan->dcid;
4890
4891 if (!req->dest_amp_id) {
4892 /* Moving to BR/EDR */
4893 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4894 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4895 result = L2CAP_MR_PEND;
4896 } else {
4897 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4898 result = L2CAP_MR_SUCCESS;
4899 }
4900 } else {
4901 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4902 /* Placeholder - uncomment when amp functions are available */
4903 /*amp_accept_physical(chan, req->dest_amp_id);*/
4904 result = L2CAP_MR_PEND;
4905 }
4906
4907send_move_response:
1500109b 4908 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4909
02b0fbb9
MM		 4910 l2cap_chan_unlock(chan);
4911
8d5a04a1
MM		 4912 return 0;
4913}
4914
5b155ef9
MM		 4915static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4916{
4917 struct l2cap_chan *chan;
4918 struct hci_chan *hchan = NULL;
4919
4920 chan = l2cap_get_chan_by_scid(conn, icid);
4921 if (!chan) {
4922 l2cap_send_move_chan_cfm_icid(conn, icid);
4923 return;
4924 }
4925
4926 __clear_chan_timer(chan);
4927 if (result == L2CAP_MR_PEND)
4928 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4929
4930 switch (chan->move_state) {
4931 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4932 /* Move confirm will be sent when logical link
4933 * is complete.
4934 */
4935 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4936 break;
4937 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4938 if (result == L2CAP_MR_PEND) {
4939 break;
4940 } else if (test_bit(CONN_LOCAL_BUSY,
4941 &chan->conn_state)) {
4942 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4943 } else {
4944 /* Logical link is up or moving to BR/EDR,
4945 * proceed with move
4946 */
4947 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4948 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4949 }
4950 break;
4951 case L2CAP_MOVE_WAIT_RSP:
4952 /* Moving to AMP */
4953 if (result == L2CAP_MR_SUCCESS) {
4954 /* Remote is ready, send confirm immediately
4955 * after logical link is ready
4956 */
4957 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4958 } else {
4959 /* Both logical link and move success
4960 * are required to confirm
4961 */
4962 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4963 }
4964
4965 /* Placeholder - get hci_chan for logical link */
4966 if (!hchan) {
4967 /* Logical link not available */
4968 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4969 break;
4970 }
4971
4972 /* If the logical link is not yet connected, do not
4973 * send confirmation.
4974 */
4975 if (hchan->state != BT_CONNECTED)
4976 break;
4977
4978 /* Logical link is already ready to go */
4979
4980 chan->hs_hcon = hchan->conn;
4981 chan->hs_hcon->l2cap_data = chan->conn;
4982
4983 if (result == L2CAP_MR_SUCCESS) {
4984 /* Can confirm now */
4985 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4986 } else {
4987 /* Now only need move success
4988 * to confirm
4989 */
4990 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4991 }
4992
4993 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4994 break;
4995 default:
4996 /* Any other amp move state means the move failed. */
4997 chan->move_id = chan->local_amp_id;
4998 l2cap_move_done(chan);
4999 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5000 }
5001
5002 l2cap_chan_unlock(chan);
5003}
5004
5005static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5006 u16 result)
5007{
5008 struct l2cap_chan *chan;
5009
5010 chan = l2cap_get_chan_by_ident(conn, ident);
5011 if (!chan) {
5012 /* Could not locate channel, icid is best guess */
5013 l2cap_send_move_chan_cfm_icid(conn, icid);
5014 return;
5015 }
5016
5017 __clear_chan_timer(chan);
5018
5019 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5020 if (result == L2CAP_MR_COLLISION) {
5021 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5022 } else {
5023 /* Cleanup - cancel move */
5024 chan->move_id = chan->local_amp_id;
5025 l2cap_move_done(chan);
5026 }
5027 }
5028
5029 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5030
5031 l2cap_chan_unlock(chan);
5032}
5033
5034static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5035 struct l2cap_cmd_hdr *cmd,
5036 u16 cmd_len, void *data)
8d5a04a1
MM		 5037{
5038 struct l2cap_move_chan_rsp *rsp = data;
5039 u16 icid, result;
5040
5041 if (cmd_len != sizeof(*rsp))
5042 return -EPROTO;
5043
5044 icid = le16_to_cpu(rsp->icid);
5045 result = le16_to_cpu(rsp->result);
5046
ad0ac6ca 5047 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5048
5b155ef9
MM		 5049 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5050 l2cap_move_continue(conn, icid, result);
5051 else
5052 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5053
5054 return 0;
5055}
5056
5f3847a4
MM		 5057static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5058 struct l2cap_cmd_hdr *cmd,
5059 u16 cmd_len, void *data)
8d5a04a1
MM		 5060{
5061 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5062 struct l2cap_chan *chan;
8d5a04a1
MM		 5063 u16 icid, result;
5064
5065 if (cmd_len != sizeof(*cfm))
5066 return -EPROTO;
5067
5068 icid = le16_to_cpu(cfm->icid);
5069 result = le16_to_cpu(cfm->result);
5070
ad0ac6ca 5071 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5072
5f3847a4
MM		 5073 chan = l2cap_get_chan_by_dcid(conn, icid);
5074 if (!chan) {
5075 /* Spec requires a response even if the icid was not found */
5076 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5077 return 0;
5078 }
5079
5080 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5081 if (result == L2CAP_MC_CONFIRMED) {
5082 chan->local_amp_id = chan->move_id;
5083 if (!chan->local_amp_id)
5084 __release_logical_link(chan);
5085 } else {
5086 chan->move_id = chan->local_amp_id;
5087 }
5088
5089 l2cap_move_done(chan);
5090 }
5091
8d5a04a1
MM		 5092 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5093
5f3847a4
MM		 5094 l2cap_chan_unlock(chan);
5095
8d5a04a1
MM		 5096 return 0;
5097}
5098
5099static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5100 struct l2cap_cmd_hdr *cmd,
5101 u16 cmd_len, void *data)
8d5a04a1
MM		 5102{
5103 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5104 struct l2cap_chan *chan;
8d5a04a1
MM		 5105 u16 icid;
5106
5107 if (cmd_len != sizeof(*rsp))
5108 return -EPROTO;
5109
5110 icid = le16_to_cpu(rsp->icid);
5111
ad0ac6ca 5112 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5113
3fd71a0a
MM		 5114 chan = l2cap_get_chan_by_scid(conn, icid);
5115 if (!chan)
5116 return 0;
5117
5118 __clear_chan_timer(chan);
5119
5120 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5121 chan->local_amp_id = chan->move_id;
5122
5123 if (!chan->local_amp_id && chan->hs_hchan)
5124 __release_logical_link(chan);
5125
5126 l2cap_move_done(chan);
5127 }
5128
5129 l2cap_chan_unlock(chan);
5130
8d5a04a1
MM		 5131 return 0;
5132}
5133
e2174ca4 5134static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 5135 u16 to_multiplier)
de73115a
CT		 5136{
5137 u16 max_latency;
5138
5139 if (min > max || min < 6 || max > 3200)
5140 return -EINVAL;
5141
5142 if (to_multiplier < 10 || to_multiplier > 3200)
5143 return -EINVAL;
5144
5145 if (max >= to_multiplier * 8)
5146 return -EINVAL;
5147
5148 max_latency = (to_multiplier * 8 / max) - 1;
5149 if (latency > 499 || latency > max_latency)
5150 return -EINVAL;
5151
5152 return 0;
5153}
5154
5155static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818
GP		 5156 struct l2cap_cmd_hdr *cmd,
5157 u8 *data)
de73115a
CT		 5158{
5159 struct hci_conn *hcon = conn->hcon;
5160 struct l2cap_conn_param_update_req *req;
5161 struct l2cap_conn_param_update_rsp rsp;
5162 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 5163 int err;
de73115a
CT		 5164
5165 if (!(hcon->link_mode & HCI_LM_MASTER))
5166 return -EINVAL;
5167
5168 cmd_len = __le16_to_cpu(cmd->len);
5169 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5170 return -EPROTO;
5171
5172 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5173 min = __le16_to_cpu(req->min);
5174 max = __le16_to_cpu(req->max);
de73115a
CT		 5175 latency = __le16_to_cpu(req->latency);
5176 to_multiplier = __le16_to_cpu(req->to_multiplier);
5177
5178 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5179 min, max, latency, to_multiplier);
de73115a
CT		 5180
5181 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5182
5183 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5184 if (err)
ac73498c 5185 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5186 else
ac73498c 5187 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5188
5189 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5190 sizeof(rsp), &rsp);
de73115a 5191
2ce603eb
CT		 5192 if (!err)
5193 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5194
de73115a
CT		 5195 return 0;
5196}
5197
3300d9a9 5198static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5199 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5200 u8 *data)
3300d9a9
CT		 5201{
5202 int err = 0;
5203
5204 switch (cmd->code) {
5205 case L2CAP_COMMAND_REJ:
cb3b3152 5206 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5207 break;
5208
5209 case L2CAP_CONN_REQ:
cb3b3152 5210 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5211 break;
5212
5213 case L2CAP_CONN_RSP:
f5a2598d 5214 case L2CAP_CREATE_CHAN_RSP:
cb3b3152 5215 err = l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5216 break;
5217
5218 case L2CAP_CONF_REQ:
5219 err = l2cap_config_req(conn, cmd, cmd_len, data);
5220 break;
5221
5222 case L2CAP_CONF_RSP:
cb3b3152 5223 err = l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5224 break;
5225
5226 case L2CAP_DISCONN_REQ:
cb3b3152 5227 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5228 break;
5229
5230 case L2CAP_DISCONN_RSP:
cb3b3152 5231 err = l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5232 break;
5233
5234 case L2CAP_ECHO_REQ:
5235 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5236 break;
5237
5238 case L2CAP_ECHO_RSP:
5239 break;
5240
5241 case L2CAP_INFO_REQ:
cb3b3152 5242 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5243 break;
5244
5245 case L2CAP_INFO_RSP:
cb3b3152 5246 err = l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5247 break;
5248
f94ff6ff
MM		 5249 case L2CAP_CREATE_CHAN_REQ:
5250 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5251 break;
5252
8d5a04a1
MM		 5253 case L2CAP_MOVE_CHAN_REQ:
5254 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5255 break;
5256
5257 case L2CAP_MOVE_CHAN_RSP:
5258 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5259 break;
5260
5261 case L2CAP_MOVE_CHAN_CFM:
5262 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5263 break;
5264
5265 case L2CAP_MOVE_CHAN_CFM_RSP:
5266 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5267 break;
5268
3300d9a9
CT		 5269 default:
5270 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5271 err = -EINVAL;
5272 break;
5273 }
5274
5275 return err;
5276}
5277
5278static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2d792818 5279 struct l2cap_cmd_hdr *cmd, u8 *data)
3300d9a9
CT		 5280{
5281 switch (cmd->code) {
5282 case L2CAP_COMMAND_REJ:
5283 return 0;
5284
5285 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 5286 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 5287
5288 case L2CAP_CONN_PARAM_UPDATE_RSP:
5289 return 0;
5290
5291 default:
5292 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5293 return -EINVAL;
5294 }
5295}
5296
c5623556
JH		 5297static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5298 struct sk_buff *skb)
5299{
5300 u8 *data = skb->data;
5301 int len = skb->len;
5302 struct l2cap_cmd_hdr cmd;
5303 int err;
5304
5305 l2cap_raw_recv(conn, skb);
5306
5307 while (len >= L2CAP_CMD_HDR_SIZE) {
5308 u16 cmd_len;
5309 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5310 data += L2CAP_CMD_HDR_SIZE;
5311 len -= L2CAP_CMD_HDR_SIZE;
5312
5313 cmd_len = le16_to_cpu(cmd.len);
5314
5315 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5316 cmd.ident);
5317
5318 if (cmd_len > len || !cmd.ident) {
5319 BT_DBG("corrupted command");
5320 break;
5321 }
5322
5323 err = l2cap_le_sig_cmd(conn, &cmd, data);
5324 if (err) {
5325 struct l2cap_cmd_rej_unk rej;
5326
5327 BT_ERR("Wrong link type (%d)", err);
5328
5329 /* FIXME: Map err to a valid reason */
5330 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5331 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5332 sizeof(rej), &rej);
5333 }
5334
5335 data += cmd_len;
5336 len -= cmd_len;
5337 }
5338
5339 kfree_skb(skb);
5340}
5341
3300d9a9 5342static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5343 struct sk_buff *skb)
1da177e4
LT		 5344{
5345 u8 *data = skb->data;
5346 int len = skb->len;
5347 struct l2cap_cmd_hdr cmd;
3300d9a9 5348 int err;
1da177e4
LT		 5349
5350 l2cap_raw_recv(conn, skb);
5351
5352 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5353 u16 cmd_len;
1da177e4
LT		 5354 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5355 data += L2CAP_CMD_HDR_SIZE;
5356 len -= L2CAP_CMD_HDR_SIZE;
5357
88219a0f 5358 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5359
2d792818
GP		 5360 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5361 cmd.ident);
1da177e4 5362
88219a0f 5363 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5364 BT_DBG("corrupted command");
5365 break;
5366 }
5367
c5623556 5368 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5369 if (err) {
e2fd318e 5370 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5371
5372 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 5373
5374 /* FIXME: Map err to a valid reason */
ac73498c 5375 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5376 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5377 sizeof(rej), &rej);
1da177e4
LT		 5378 }
5379
88219a0f
AV		 5380 data += cmd_len;
5381 len -= cmd_len;
1da177e4
LT		 5382 }
5383
5384 kfree_skb(skb);
5385}
5386
47d1ec61 5387static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5388{
5389 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5390 int hdr_size;
5391
5392 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5393 hdr_size = L2CAP_EXT_HDR_SIZE;
5394 else
5395 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5396
47d1ec61 5397 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5398 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5399 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5400 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5401
5402 if (our_fcs != rcv_fcs)
7a560e5c 5403 return -EBADMSG;
fcc203c3
GP		 5404 }
5405 return 0;
5406}
5407
6ea00485 5408static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5409{
e31f7633 5410 struct l2cap_ctrl control;
d5392c8f 5411
e31f7633 5412 BT_DBG("chan %p", chan);
d5392c8f 5413
e31f7633
MM		 5414 memset(&control, 0, sizeof(control));
5415 control.sframe = 1;
5416 control.final = 1;
5417 control.reqseq = chan->buffer_seq;
5418 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5419
e2ab4353 5420 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5421 control.super = L2CAP_SUPER_RNR;
5422 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5423 }
5424
e31f7633
MM		 5425 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5426 chan->unacked_frames > 0)
5427 __set_retrans_timer(chan);
d5392c8f 5428
e31f7633 5429 /* Send pending iframes */
525cd185 5430 l2cap_ertm_send(chan);
d5392c8f 5431
e2ab4353 5432 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5433 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5434 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5435 * send it now.
5436 */
5437 control.super = L2CAP_SUPER_RR;
5438 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5439 }
5440}
5441
2d792818
GP		 5442static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5443 struct sk_buff **last_frag)
18778a63 5444{
84084a31
MM		 5445 /* skb->len reflects data in skb as well as all fragments
5446 * skb->data_len reflects only data in fragments
5447 */
5448 if (!skb_has_frag_list(skb))
5449 skb_shinfo(skb)->frag_list = new_frag;
5450
5451 new_frag->next = NULL;
5452
5453 (*last_frag)->next = new_frag;
5454 *last_frag = new_frag;
5455
5456 skb->len += new_frag->len;
5457 skb->data_len += new_frag->len;
5458 skb->truesize += new_frag->truesize;
5459}
5460
4b51dae9
MM		 5461static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5462 struct l2cap_ctrl *control)
84084a31
MM		 5463{
5464 int err = -EINVAL;
18778a63 5465
4b51dae9 5466 switch (control->sar) {
7e0ef6ee 5467 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5468 if (chan->sdu)
5469 break;
18778a63 5470
80b98027 5471 err = chan->ops->recv(chan, skb);
84084a31 5472 break;
18778a63 5473
7e0ef6ee 5474 case L2CAP_SAR_START:
84084a31
MM		 5475 if (chan->sdu)
5476 break;
18778a63 5477
6f61fd47 5478 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5479 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5480
84084a31
MM		 5481 if (chan->sdu_len > chan->imtu) {
5482 err = -EMSGSIZE;
5483 break;
5484 }
1890d36b 5485
84084a31
MM		 5486 if (skb->len >= chan->sdu_len)
5487 break;
18778a63 5488
84084a31
MM		 5489 chan->sdu = skb;
5490 chan->sdu_last_frag = skb;
18778a63 5491
84084a31
MM		 5492 skb = NULL;
5493 err = 0;
18778a63
GP		 5494 break;
5495
7e0ef6ee 5496 case L2CAP_SAR_CONTINUE:
6f61fd47 5497 if (!chan->sdu)
84084a31 5498 break;
18778a63 5499
84084a31
MM		 5500 append_skb_frag(chan->sdu, skb,
5501 &chan->sdu_last_frag);
5502 skb = NULL;
18778a63 5503
84084a31
MM		 5504 if (chan->sdu->len >= chan->sdu_len)
5505 break;
4178ba46 5506
84084a31 5507 err = 0;
18778a63
GP		 5508 break;
5509
7e0ef6ee 5510 case L2CAP_SAR_END:
6f61fd47 5511 if (!chan->sdu)
84084a31 5512 break;
18778a63 5513
84084a31
MM		 5514 append_skb_frag(chan->sdu, skb,
5515 &chan->sdu_last_frag);
5516 skb = NULL;
4178ba46 5517
84084a31
MM		 5518 if (chan->sdu->len != chan->sdu_len)
5519 break;
18778a63 5520
80b98027 5521 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5522
84084a31
MM		 5523 if (!err) {
5524 /* Reassembly complete */
5525 chan->sdu = NULL;
5526 chan->sdu_last_frag = NULL;
5527 chan->sdu_len = 0;
1890d36b 5528 }
18778a63
GP		 5529 break;
5530 }
5531
84084a31
MM		 5532 if (err) {
5533 kfree_skb(skb);
5534 kfree_skb(chan->sdu);
5535 chan->sdu = NULL;
5536 chan->sdu_last_frag = NULL;
5537 chan->sdu_len = 0;
5538 }
18778a63 5539
84084a31 5540 return err;
18778a63
GP		 5541}
5542
32b32735
MM		 5543static int l2cap_resegment(struct l2cap_chan *chan)
5544{
5545 /* Placeholder */
5546 return 0;
5547}
5548
61aa4f5b 5549void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5550{
61aa4f5b 5551 u8 event;
712132eb 5552
61aa4f5b
MM		 5553 if (chan->mode != L2CAP_MODE_ERTM)
5554 return;
712132eb 5555
61aa4f5b 5556 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5557 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5558}
5559
d2a7ac5d
MM		 5560static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5561{
63838725
MM		 5562 int err = 0;
5563 /* Pass sequential frames to l2cap_reassemble_sdu()
5564 * until a gap is encountered.
5565 */
5566
5567 BT_DBG("chan %p", chan);
5568
5569 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5570 struct sk_buff *skb;
5571 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5572 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5573
5574 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5575
5576 if (!skb)
5577 break;
5578
5579 skb_unlink(skb, &chan->srej_q);
5580 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5581 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5582 if (err)
5583 break;
5584 }
5585
5586 if (skb_queue_empty(&chan->srej_q)) {
5587 chan->rx_state = L2CAP_RX_STATE_RECV;
5588 l2cap_send_ack(chan);
5589 }
5590
5591 return err;
d2a7ac5d
MM		 5592}
5593
5594static void l2cap_handle_srej(struct l2cap_chan *chan,
5595 struct l2cap_ctrl *control)
5596{
f80842a8
MM		 5597 struct sk_buff *skb;
5598
5599 BT_DBG("chan %p, control %p", chan, control);
5600
5601 if (control->reqseq == chan->next_tx_seq) {
5602 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5603 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5604 return;
5605 }
5606
5607 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5608
5609 if (skb == NULL) {
5610 BT_DBG("Seq %d not available for retransmission",
5611 control->reqseq);
5612 return;
5613 }
5614
5615 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5616 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5617 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5618 return;
5619 }
5620
5621 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5622
5623 if (control->poll) {
5624 l2cap_pass_to_tx(chan, control);
5625
5626 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5627 l2cap_retransmit(chan, control);
5628 l2cap_ertm_send(chan);
5629
5630 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5631 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5632 chan->srej_save_reqseq = control->reqseq;
5633 }
5634 } else {
5635 l2cap_pass_to_tx_fbit(chan, control);
5636
5637 if (control->final) {
5638 if (chan->srej_save_reqseq != control->reqseq ||
5639 !test_and_clear_bit(CONN_SREJ_ACT,
5640 &chan->conn_state))
5641 l2cap_retransmit(chan, control);
5642 } else {
5643 l2cap_retransmit(chan, control);
5644 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5645 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5646 chan->srej_save_reqseq = control->reqseq;
5647 }
5648 }
5649 }
d2a7ac5d
MM		 5650}
5651
5652static void l2cap_handle_rej(struct l2cap_chan *chan,
5653 struct l2cap_ctrl *control)
5654{
fcd289df
MM		 5655 struct sk_buff *skb;
5656
5657 BT_DBG("chan %p, control %p", chan, control);
5658
5659 if (control->reqseq == chan->next_tx_seq) {
5660 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5661 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5662 return;
5663 }
5664
5665 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5666
5667 if (chan->max_tx && skb &&
5668 bt_cb(skb)->control.retries >= chan->max_tx) {
5669 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5670 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5671 return;
5672 }
5673
5674 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5675
5676 l2cap_pass_to_tx(chan, control);
5677
5678 if (control->final) {
5679 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5680 l2cap_retransmit_all(chan, control);
5681 } else {
5682 l2cap_retransmit_all(chan, control);
5683 l2cap_ertm_send(chan);
5684 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5685 set_bit(CONN_REJ_ACT, &chan->conn_state);
5686 }
d2a7ac5d
MM		 5687}
5688
4b51dae9
MM		 5689static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5690{
5691 BT_DBG("chan %p, txseq %d", chan, txseq);
5692
5693 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5694 chan->expected_tx_seq);
5695
5696 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5697 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5698 chan->tx_win) {
4b51dae9
MM		 5699 /* See notes below regarding "double poll" and
5700 * invalid packets.
5701 */
5702 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5703 BT_DBG("Invalid/Ignore - after SREJ");
5704 return L2CAP_TXSEQ_INVALID_IGNORE;
5705 } else {
5706 BT_DBG("Invalid - in window after SREJ sent");
5707 return L2CAP_TXSEQ_INVALID;
5708 }
5709 }
5710
5711 if (chan->srej_list.head == txseq) {
5712 BT_DBG("Expected SREJ");
5713 return L2CAP_TXSEQ_EXPECTED_SREJ;
5714 }
5715
5716 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5717 BT_DBG("Duplicate SREJ - txseq already stored");
5718 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5719 }
5720
5721 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5722 BT_DBG("Unexpected SREJ - not requested");
5723 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5724 }
5725 }
5726
5727 if (chan->expected_tx_seq == txseq) {
5728 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5729 chan->tx_win) {
5730 BT_DBG("Invalid - txseq outside tx window");
5731 return L2CAP_TXSEQ_INVALID;
5732 } else {
5733 BT_DBG("Expected");
5734 return L2CAP_TXSEQ_EXPECTED;
5735 }
5736 }
5737
5738 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 5739 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 5740 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5741 return L2CAP_TXSEQ_DUPLICATE;
5742 }
5743
5744 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5745 /* A source of invalid packets is a "double poll" condition,
5746 * where delays cause us to send multiple poll packets. If
5747 * the remote stack receives and processes both polls,
5748 * sequence numbers can wrap around in such a way that a
5749 * resent frame has a sequence number that looks like new data
5750 * with a sequence gap. This would trigger an erroneous SREJ
5751 * request.
5752 *
5753 * Fortunately, this is impossible with a tx window that's
5754 * less than half of the maximum sequence number, which allows
5755 * invalid frames to be safely ignored.
5756 *
5757 * With tx window sizes greater than half of the tx window
5758 * maximum, the frame is invalid and cannot be ignored. This
5759 * causes a disconnect.
5760 */
5761
5762 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5763 BT_DBG("Invalid/Ignore - txseq outside tx window");
5764 return L2CAP_TXSEQ_INVALID_IGNORE;
5765 } else {
5766 BT_DBG("Invalid - txseq outside tx window");
5767 return L2CAP_TXSEQ_INVALID;
5768 }
5769 } else {
5770 BT_DBG("Unexpected - txseq indicates missing frames");
5771 return L2CAP_TXSEQ_UNEXPECTED;
5772 }
5773}
5774
d2a7ac5d
MM		 5775static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5776 struct l2cap_ctrl *control,
5777 struct sk_buff *skb, u8 event)
5778{
5779 int err = 0;
5780 bool skb_in_use = 0;
5781
5782 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5783 event);
5784
5785 switch (event) {
5786 case L2CAP_EV_RECV_IFRAME:
5787 switch (l2cap_classify_txseq(chan, control->txseq)) {
5788 case L2CAP_TXSEQ_EXPECTED:
5789 l2cap_pass_to_tx(chan, control);
5790
5791 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5792 BT_DBG("Busy, discarding expected seq %d",
5793 control->txseq);
5794 break;
5795 }
5796
5797 chan->expected_tx_seq = __next_seq(chan,
5798 control->txseq);
5799
5800 chan->buffer_seq = chan->expected_tx_seq;
5801 skb_in_use = 1;
5802
5803 err = l2cap_reassemble_sdu(chan, skb, control);
5804 if (err)
5805 break;
5806
5807 if (control->final) {
5808 if (!test_and_clear_bit(CONN_REJ_ACT,
5809 &chan->conn_state)) {
5810 control->final = 0;
5811 l2cap_retransmit_all(chan, control);
5812 l2cap_ertm_send(chan);
5813 }
5814 }
5815
5816 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5817 l2cap_send_ack(chan);
5818 break;
5819 case L2CAP_TXSEQ_UNEXPECTED:
5820 l2cap_pass_to_tx(chan, control);
5821
5822 /* Can't issue SREJ frames in the local busy state.
5823 * Drop this frame, it will be seen as missing
5824 * when local busy is exited.
5825 */
5826 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5827 BT_DBG("Busy, discarding unexpected seq %d",
5828 control->txseq);
5829 break;
5830 }
5831
5832 /* There was a gap in the sequence, so an SREJ
5833 * must be sent for each missing frame. The
5834 * current frame is stored for later use.
5835 */
5836 skb_queue_tail(&chan->srej_q, skb);
5837 skb_in_use = 1;
5838 BT_DBG("Queued %p (queue len %d)", skb,
5839 skb_queue_len(&chan->srej_q));
5840
5841 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5842 l2cap_seq_list_clear(&chan->srej_list);
5843 l2cap_send_srej(chan, control->txseq);
5844
5845 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5846 break;
5847 case L2CAP_TXSEQ_DUPLICATE:
5848 l2cap_pass_to_tx(chan, control);
5849 break;
5850 case L2CAP_TXSEQ_INVALID_IGNORE:
5851 break;
5852 case L2CAP_TXSEQ_INVALID:
5853 default:
5e4e3972 5854 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5855 break;
5856 }
5857 break;
5858 case L2CAP_EV_RECV_RR:
5859 l2cap_pass_to_tx(chan, control);
5860 if (control->final) {
5861 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5862
e6a3ee6e
MM		 5863 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5864 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 5865 control->final = 0;
5866 l2cap_retransmit_all(chan, control);
5867 }
5868
5869 l2cap_ertm_send(chan);
5870 } else if (control->poll) {
5871 l2cap_send_i_or_rr_or_rnr(chan);
5872 } else {
5873 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5874 &chan->conn_state) &&
5875 chan->unacked_frames)
5876 __set_retrans_timer(chan);
5877
5878 l2cap_ertm_send(chan);
5879 }
5880 break;
5881 case L2CAP_EV_RECV_RNR:
5882 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5883 l2cap_pass_to_tx(chan, control);
5884 if (control && control->poll) {
5885 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5886 l2cap_send_rr_or_rnr(chan, 0);
5887 }
5888 __clear_retrans_timer(chan);
5889 l2cap_seq_list_clear(&chan->retrans_list);
5890 break;
5891 case L2CAP_EV_RECV_REJ:
5892 l2cap_handle_rej(chan, control);
5893 break;
5894 case L2CAP_EV_RECV_SREJ:
5895 l2cap_handle_srej(chan, control);
5896 break;
5897 default:
5898 break;
5899 }
5900
5901 if (skb && !skb_in_use) {
5902 BT_DBG("Freeing %p", skb);
5903 kfree_skb(skb);
5904 }
5905
5906 return err;
5907}
5908
5909static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5910 struct l2cap_ctrl *control,
5911 struct sk_buff *skb, u8 event)
5912{
5913 int err = 0;
5914 u16 txseq = control->txseq;
5915 bool skb_in_use = 0;
5916
5917 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5918 event);
5919
5920 switch (event) {
5921 case L2CAP_EV_RECV_IFRAME:
5922 switch (l2cap_classify_txseq(chan, txseq)) {
5923 case L2CAP_TXSEQ_EXPECTED:
5924 /* Keep frame for reassembly later */
5925 l2cap_pass_to_tx(chan, control);
5926 skb_queue_tail(&chan->srej_q, skb);
5927 skb_in_use = 1;
5928 BT_DBG("Queued %p (queue len %d)", skb,
5929 skb_queue_len(&chan->srej_q));
5930
5931 chan->expected_tx_seq = __next_seq(chan, txseq);
5932 break;
5933 case L2CAP_TXSEQ_EXPECTED_SREJ:
5934 l2cap_seq_list_pop(&chan->srej_list);
5935
5936 l2cap_pass_to_tx(chan, control);
5937 skb_queue_tail(&chan->srej_q, skb);
5938 skb_in_use = 1;
5939 BT_DBG("Queued %p (queue len %d)", skb,
5940 skb_queue_len(&chan->srej_q));
5941
5942 err = l2cap_rx_queued_iframes(chan);
5943 if (err)
5944 break;
5945
5946 break;
5947 case L2CAP_TXSEQ_UNEXPECTED:
5948 /* Got a frame that can't be reassembled yet.
5949 * Save it for later, and send SREJs to cover
5950 * the missing frames.
5951 */
5952 skb_queue_tail(&chan->srej_q, skb);
5953 skb_in_use = 1;
5954 BT_DBG("Queued %p (queue len %d)", skb,
5955 skb_queue_len(&chan->srej_q));
5956
5957 l2cap_pass_to_tx(chan, control);
5958 l2cap_send_srej(chan, control->txseq);
5959 break;
5960 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5961 /* This frame was requested with an SREJ, but
5962 * some expected retransmitted frames are
5963 * missing. Request retransmission of missing
5964 * SREJ'd frames.
5965 */
5966 skb_queue_tail(&chan->srej_q, skb);
5967 skb_in_use = 1;
5968 BT_DBG("Queued %p (queue len %d)", skb,
5969 skb_queue_len(&chan->srej_q));
5970
5971 l2cap_pass_to_tx(chan, control);
5972 l2cap_send_srej_list(chan, control->txseq);
5973 break;
5974 case L2CAP_TXSEQ_DUPLICATE_SREJ:
5975 /* We've already queued this frame. Drop this copy. */
5976 l2cap_pass_to_tx(chan, control);
5977 break;
5978 case L2CAP_TXSEQ_DUPLICATE:
5979 /* Expecting a later sequence number, so this frame
5980 * was already received. Ignore it completely.
5981 */
5982 break;
5983 case L2CAP_TXSEQ_INVALID_IGNORE:
5984 break;
5985 case L2CAP_TXSEQ_INVALID:
5986 default:
5e4e3972 5987 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5988 break;
5989 }
5990 break;
5991 case L2CAP_EV_RECV_RR:
5992 l2cap_pass_to_tx(chan, control);
5993 if (control->final) {
5994 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5995
5996 if (!test_and_clear_bit(CONN_REJ_ACT,
5997 &chan->conn_state)) {
5998 control->final = 0;
5999 l2cap_retransmit_all(chan, control);
6000 }
6001
6002 l2cap_ertm_send(chan);
6003 } else if (control->poll) {
6004 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6005 &chan->conn_state) &&
6006 chan->unacked_frames) {
6007 __set_retrans_timer(chan);
6008 }
6009
6010 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6011 l2cap_send_srej_tail(chan);
6012 } else {
6013 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6014 &chan->conn_state) &&
6015 chan->unacked_frames)
6016 __set_retrans_timer(chan);
6017
6018 l2cap_send_ack(chan);
6019 }
6020 break;
6021 case L2CAP_EV_RECV_RNR:
6022 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6023 l2cap_pass_to_tx(chan, control);
6024 if (control->poll) {
6025 l2cap_send_srej_tail(chan);
6026 } else {
6027 struct l2cap_ctrl rr_control;
6028 memset(&rr_control, 0, sizeof(rr_control));
6029 rr_control.sframe = 1;
6030 rr_control.super = L2CAP_SUPER_RR;
6031 rr_control.reqseq = chan->buffer_seq;
6032 l2cap_send_sframe(chan, &rr_control);
6033 }
6034
6035 break;
6036 case L2CAP_EV_RECV_REJ:
6037 l2cap_handle_rej(chan, control);
6038 break;
6039 case L2CAP_EV_RECV_SREJ:
6040 l2cap_handle_srej(chan, control);
6041 break;
6042 }
6043
6044 if (skb && !skb_in_use) {
6045 BT_DBG("Freeing %p", skb);
6046 kfree_skb(skb);
6047 }
6048
6049 return err;
6050}
6051
32b32735
MM		 6052static int l2cap_finish_move(struct l2cap_chan *chan)
6053{
6054 BT_DBG("chan %p", chan);
6055
6056 chan->rx_state = L2CAP_RX_STATE_RECV;
6057
6058 if (chan->hs_hcon)
6059 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6060 else
6061 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6062
6063 return l2cap_resegment(chan);
6064}
6065
6066static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6067 struct l2cap_ctrl *control,
6068 struct sk_buff *skb, u8 event)
6069{
6070 int err;
6071
6072 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6073 event);
6074
6075 if (!control->poll)
6076 return -EPROTO;
6077
6078 l2cap_process_reqseq(chan, control->reqseq);
6079
6080 if (!skb_queue_empty(&chan->tx_q))
6081 chan->tx_send_head = skb_peek(&chan->tx_q);
6082 else
6083 chan->tx_send_head = NULL;
6084
6085 /* Rewind next_tx_seq to the point expected
6086 * by the receiver.
6087 */
6088 chan->next_tx_seq = control->reqseq;
6089 chan->unacked_frames = 0;
6090
6091 err = l2cap_finish_move(chan);
6092 if (err)
6093 return err;
6094
6095 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6096 l2cap_send_i_or_rr_or_rnr(chan);
6097
6098 if (event == L2CAP_EV_RECV_IFRAME)
6099 return -EPROTO;
6100
6101 return l2cap_rx_state_recv(chan, control, NULL, event);
6102}
6103
6104static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6105 struct l2cap_ctrl *control,
6106 struct sk_buff *skb, u8 event)
6107{
6108 int err;
6109
6110 if (!control->final)
6111 return -EPROTO;
6112
6113 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6114
6115 chan->rx_state = L2CAP_RX_STATE_RECV;
6116 l2cap_process_reqseq(chan, control->reqseq);
6117
6118 if (!skb_queue_empty(&chan->tx_q))
6119 chan->tx_send_head = skb_peek(&chan->tx_q);
6120 else
6121 chan->tx_send_head = NULL;
6122
6123 /* Rewind next_tx_seq to the point expected
6124 * by the receiver.
6125 */
6126 chan->next_tx_seq = control->reqseq;
6127 chan->unacked_frames = 0;
6128
6129 if (chan->hs_hcon)
6130 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6131 else
6132 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6133
6134 err = l2cap_resegment(chan);
6135
6136 if (!err)
6137 err = l2cap_rx_state_recv(chan, control, skb, event);
6138
6139 return err;
6140}
6141
d2a7ac5d
MM		 6142static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6143{
6144 /* Make sure reqseq is for a packet that has been sent but not acked */
6145 u16 unacked;
6146
6147 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6148 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6149}
6150
cec8ab6e
MM		 6151static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6152 struct sk_buff *skb, u8 event)
218bb9df 6153{
d2a7ac5d
MM		 6154 int err = 0;
6155
6156 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6157 control, skb, event, chan->rx_state);
6158
6159 if (__valid_reqseq(chan, control->reqseq)) {
6160 switch (chan->rx_state) {
6161 case L2CAP_RX_STATE_RECV:
6162 err = l2cap_rx_state_recv(chan, control, skb, event);
6163 break;
6164 case L2CAP_RX_STATE_SREJ_SENT:
6165 err = l2cap_rx_state_srej_sent(chan, control, skb,
6166 event);
6167 break;
32b32735
MM		 6168 case L2CAP_RX_STATE_WAIT_P:
6169 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6170 break;
6171 case L2CAP_RX_STATE_WAIT_F:
6172 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6173 break;
d2a7ac5d
MM		 6174 default:
6175 /* shut it down */
6176 break;
6177 }
6178 } else {
6179 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6180 control->reqseq, chan->next_tx_seq,
6181 chan->expected_ack_seq);
5e4e3972 6182 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6183 }
6184
6185 return err;
cec8ab6e
MM		 6186}
6187
6188static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6189 struct sk_buff *skb)
6190{
4b51dae9
MM		 6191 int err = 0;
6192
6193 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6194 chan->rx_state);
6195
6196 if (l2cap_classify_txseq(chan, control->txseq) ==
6197 L2CAP_TXSEQ_EXPECTED) {
6198 l2cap_pass_to_tx(chan, control);
6199
6200 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6201 __next_seq(chan, chan->buffer_seq));
6202
6203 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6204
6205 l2cap_reassemble_sdu(chan, skb, control);
6206 } else {
6207 if (chan->sdu) {
6208 kfree_skb(chan->sdu);
6209 chan->sdu = NULL;
6210 }
6211 chan->sdu_last_frag = NULL;
6212 chan->sdu_len = 0;
6213
6214 if (skb) {
6215 BT_DBG("Freeing %p", skb);
6216 kfree_skb(skb);
6217 }
6218 }
6219
6220 chan->last_acked_seq = control->txseq;
6221 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6222
6223 return err;
cec8ab6e
MM		 6224}
6225
6226static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6227{
6228 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6229 u16 len;
6230 u8 event;
218bb9df 6231
b76bbd66
MM		 6232 __unpack_control(chan, skb);
6233
218bb9df
GP		 6234 len = skb->len;
6235
6236 /*
6237 * We can just drop the corrupted I-frame here.
6238 * Receiver will miss it and start proper recovery
cec8ab6e 6239 * procedures and ask for retransmission.
218bb9df 6240 */
47d1ec61 6241 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6242 goto drop;
6243
cec8ab6e 6244 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6245 len -= L2CAP_SDULEN_SIZE;
218bb9df 6246
47d1ec61 6247 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6248 len -= L2CAP_FCS_SIZE;
218bb9df 6249
47d1ec61 6250 if (len > chan->mps) {
5e4e3972 6251 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6252 goto drop;
6253 }
6254
cec8ab6e
MM		 6255 if (!control->sframe) {
6256 int err;
218bb9df 6257
cec8ab6e
MM		 6258 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6259 control->sar, control->reqseq, control->final,
6260 control->txseq);
218bb9df 6261
cec8ab6e
MM		 6262 /* Validate F-bit - F=0 always valid, F=1 only
6263 * valid in TX WAIT_F
6264 */
6265 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6266 goto drop;
cec8ab6e
MM		 6267
6268 if (chan->mode != L2CAP_MODE_STREAMING) {
6269 event = L2CAP_EV_RECV_IFRAME;
6270 err = l2cap_rx(chan, control, skb, event);
6271 } else {
6272 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6273 }
6274
cec8ab6e 6275 if (err)
5e4e3972 6276 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6277 } else {
cec8ab6e
MM		 6278 const u8 rx_func_to_event[4] = {
6279 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6280 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6281 };
6282
6283 /* Only I-frames are expected in streaming mode */
6284 if (chan->mode == L2CAP_MODE_STREAMING)
6285 goto drop;
6286
6287 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6288 control->reqseq, control->final, control->poll,
6289 control->super);
6290
218bb9df 6291 if (len != 0) {
1bb166e6 6292 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6293 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6294 goto drop;
6295 }
6296
cec8ab6e
MM		 6297 /* Validate F and P bits */
6298 if (control->final && (control->poll ||
6299 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6300 goto drop;
6301
6302 event = rx_func_to_event[control->super];
6303 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6304 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6305 }
6306
6307 return 0;
6308
6309drop:
6310 kfree_skb(skb);
6311 return 0;
6312}
6313
13ca56e0
AE		 6314static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6315 struct sk_buff *skb)
1da177e4 6316{
48454079 6317 struct l2cap_chan *chan;
1da177e4 6318
baa7e1fa 6319 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6320 if (!chan) {
97e8e89d
AE		 6321 if (cid == L2CAP_CID_A2MP) {
6322 chan = a2mp_channel_create(conn, skb);
6323 if (!chan) {
6324 kfree_skb(skb);
13ca56e0 6325 return;
97e8e89d
AE		 6326 }
6327
6328 l2cap_chan_lock(chan);
6329 } else {
6330 BT_DBG("unknown cid 0x%4.4x", cid);
6331 /* Drop packet and return */
6332 kfree_skb(skb);
13ca56e0 6333 return;
97e8e89d 6334 }
1da177e4
LT		 6335 }
6336
49208c9c 6337 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6338
89bc500e 6339 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6340 goto drop;
6341
0c1bc5c6 6342 switch (chan->mode) {
1c2acffb
GP		 6343 case L2CAP_MODE_BASIC:
6344 /* If socket recv buffers overflows we drop data here
6345 * which is *bad* because L2CAP has to be reliable.
6346 * But we don't have any other choice. L2CAP doesn't
6347 * provide flow control mechanism. */
1da177e4 6348
0c1bc5c6 6349 if (chan->imtu < skb->len)
1c2acffb 6350 goto drop;
1da177e4 6351
80b98027 6352 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6353 goto done;
6354 break;
6355
6356 case L2CAP_MODE_ERTM:
6840ed07 6357 case L2CAP_MODE_STREAMING:
cec8ab6e 6358 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6359 goto done;
6360
1c2acffb 6361 default:
0c1bc5c6 6362 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6363 break;
6364 }
1da177e4
LT		 6365
6366drop:
6367 kfree_skb(skb);
6368
6369done:
6be36555 6370 l2cap_chan_unlock(chan);
1da177e4
LT		 6371}
6372
84104b24
AE		 6373static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6374 struct sk_buff *skb)
1da177e4 6375{
23691d75 6376 struct l2cap_chan *chan;
1da177e4 6377
c2287681 6378 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 6379 if (!chan)
1da177e4
LT		 6380 goto drop;
6381
5b4cedaa 6382 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6383
89bc500e 6384 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6385 goto drop;
6386
e13e21dc 6387 if (chan->imtu < skb->len)
1da177e4
LT		 6388 goto drop;
6389
80b98027 6390 if (!chan->ops->recv(chan, skb))
84104b24 6391 return;
1da177e4
LT		 6392
6393drop:
6394 kfree_skb(skb);
1da177e4
LT		 6395}
6396
72f78356 6397static void l2cap_att_channel(struct l2cap_conn *conn,
6810fca7 6398 struct sk_buff *skb)
9f69bda6 6399{
23691d75 6400 struct l2cap_chan *chan;
9f69bda6 6401
af1c0134 6402 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
72f78356 6403 conn->src, conn->dst);
23691d75 6404 if (!chan)
9f69bda6
GP		 6405 goto drop;
6406
5b4cedaa 6407 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6408
e13e21dc 6409 if (chan->imtu < skb->len)
9f69bda6
GP		 6410 goto drop;
6411
80b98027 6412 if (!chan->ops->recv(chan, skb))
6810fca7 6413 return;
9f69bda6
GP		 6414
6415drop:
6416 kfree_skb(skb);
9f69bda6
GP		 6417}
6418
1da177e4
LT		 6419static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6420{
6421 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 6422 u16 cid, len;
6423 __le16 psm;
1da177e4
LT		 6424
6425 skb_pull(skb, L2CAP_HDR_SIZE);
6426 cid = __le16_to_cpu(lh->cid);
6427 len = __le16_to_cpu(lh->len);
6428
1c2acffb
GP		 6429 if (len != skb->len) {
6430 kfree_skb(skb);
6431 return;
6432 }
6433
1da177e4
LT		 6434 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6435
6436 switch (cid) {
3300d9a9 6437 case L2CAP_CID_LE_SIGNALING:
c5623556
JH		 6438 l2cap_le_sig_channel(conn, skb);
6439 break;
8db4dc46 6440 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6441 l2cap_sig_channel(conn, skb);
6442 break;
6443
8db4dc46 6444 case L2CAP_CID_CONN_LESS:
097db76c 6445 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6446 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6447 l2cap_conless_channel(conn, psm, skb);
6448 break;
6449
073d1cf3 6450 case L2CAP_CID_ATT:
72f78356 6451 l2cap_att_channel(conn, skb);
9f69bda6
GP		 6452 break;
6453
b501d6a1
AB		 6454 case L2CAP_CID_SMP:
6455 if (smp_sig_channel(conn, skb))
6456 l2cap_conn_del(conn->hcon, EACCES);
6457 break;
6458
1da177e4
LT		 6459 default:
6460 l2cap_data_channel(conn, cid, skb);
6461 break;
6462 }
6463}
6464
6465/* ---- L2CAP interface with lower layer (HCI) ---- */
6466
686ebf28 6467int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 6468{
6469 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 6470 struct l2cap_chan *c;
1da177e4 6471
6ed93dc6 6472 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 6473
6474 /* Find listening sockets and check their link_mode */
23691d75
GP		 6475 read_lock(&chan_list_lock);
6476 list_for_each_entry(c, &chan_list, global_l) {
6477 struct sock *sk = c->sk;
4343478f 6478
89bc500e 6479 if (c->state != BT_LISTEN)
1da177e4
LT		 6480 continue;
6481
6482 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 6483 lm1 |= HCI_LM_ACCEPT;
43bd0f32 6484 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 6485 lm1 |= HCI_LM_MASTER;
1da177e4 6486 exact++;
2af6b9d5
MH		 6487 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
6488 lm2 |= HCI_LM_ACCEPT;
43bd0f32 6489 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 6490 lm2 |= HCI_LM_MASTER;
6491 }
1da177e4 6492 }
23691d75 6493 read_unlock(&chan_list_lock);
1da177e4
LT		 6494
6495 return exact ? lm1 : lm2;
6496}
6497
9e664631 6498void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 6499{
0139418c
MH		 6500 struct l2cap_conn *conn;
6501
6ed93dc6 6502 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 6503
1da177e4 6504 if (!status) {
baf43251 6505 conn = l2cap_conn_add(hcon);
1da177e4
LT		 6506 if (conn)
6507 l2cap_conn_ready(conn);
ba6fc317 6508 } else {
e175072f 6509 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 6510 }
1da177e4
LT		 6511}
6512
686ebf28 6513int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 6514{
6515 struct l2cap_conn *conn = hcon->l2cap_data;
6516
6517 BT_DBG("hcon %p", hcon);
6518
686ebf28 6519 if (!conn)
9f5a0d7b 6520 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 6521 return conn->disc_reason;
6522}
6523
9e664631 6524void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 6525{
6526 BT_DBG("hcon %p reason %d", hcon, reason);
6527
e175072f 6528 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 6529}
6530
4343478f 6531static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 6532{
715ec005 6533 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 6534 return;
6535
f62e4323 6536 if (encrypt == 0x00) {
4343478f 6537 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 6538 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 6539 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 6540 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 6541 } else {
4343478f 6542 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 6543 __clear_chan_timer(chan);
f62e4323
MH		 6544 }
6545}
6546
686ebf28 6547int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 6548{
0139418c 6549 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 6550 struct l2cap_chan *chan;
1da177e4 6551
0139418c 6552 if (!conn)
1da177e4 6553 return 0;
0139418c 6554
89d8b407 6555 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 6556
160dc6ac 6557 if (hcon->type == LE_LINK) {
35d4adcc
HG		 6558 if (!status && encrypt)
6559 smp_distribute_keys(conn, 0);
17cd3f37 6560 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 6561 }
6562
3df91ea2 6563 mutex_lock(&conn->chan_lock);
1da177e4 6564
3df91ea2 6565 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 6566 l2cap_chan_lock(chan);
1da177e4 6567
89d8b407
AE		 6568 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6569 state_to_string(chan->state));
f1cb9af5 6570
78eb2f98
AE		 6571 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6572 l2cap_chan_unlock(chan);
6573 continue;
6574 }
6575
073d1cf3 6576 if (chan->scid == L2CAP_CID_ATT) {
f1cb9af5
VCG		 6577 if (!status && encrypt) {
6578 chan->sec_level = hcon->sec_level;
cf4cd009 6579 l2cap_chan_ready(chan);
f1cb9af5
VCG		 6580 }
6581
6be36555 6582 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 6583 continue;
6584 }
6585
96eff46e 6586 if (!__l2cap_no_conn_pending(chan)) {
6be36555 6587 l2cap_chan_unlock(chan);
6a8d3010
MH		 6588 continue;
6589 }
6590
89bc500e 6591 if (!status && (chan->state == BT_CONNECTED ||
2d792818 6592 chan->state == BT_CONFIG)) {
a7d7723a
GP		 6593 struct sock *sk = chan->sk;
6594
c5daa683 6595 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
a7d7723a
GP		 6596 sk->sk_state_change(sk);
6597
4343478f 6598 l2cap_check_encryption(chan, encrypt);
6be36555 6599 l2cap_chan_unlock(chan);
9719f8af
MH		 6600 continue;
6601 }
6602
89bc500e 6603 if (chan->state == BT_CONNECT) {
b1235d79 6604 if (!status) {
93c3e8f5 6605 l2cap_start_connection(chan);
b1235d79 6606 } else {
ba13ccd9 6607 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 6608 }
89bc500e 6609 } else if (chan->state == BT_CONNECT2) {
6be36555 6610 struct sock *sk = chan->sk;
b1235d79 6611 struct l2cap_conn_rsp rsp;
df3c3931 6612 __u16 res, stat;
1da177e4 6613
6be36555
AE		 6614 lock_sock(sk);
6615
b1235d79 6616 if (!status) {
c5daa683
GP		 6617 if (test_bit(BT_SK_DEFER_SETUP,
6618 &bt_sk(sk)->flags)) {
df3c3931
JH		 6619 res = L2CAP_CR_PEND;
6620 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 6621 chan->ops->defer(chan);
df3c3931 6622 } else {
0e587be7 6623 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 6624 res = L2CAP_CR_SUCCESS;
6625 stat = L2CAP_CS_NO_INFO;
6626 }
b1235d79 6627 } else {
0e587be7 6628 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 6629 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 6630 res = L2CAP_CR_SEC_BLOCK;
6631 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 6632 }
6633
6be36555
AE		 6634 release_sock(sk);
6635
fe4128e0
GP		 6636 rsp.scid = cpu_to_le16(chan->dcid);
6637 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 6638 rsp.result = cpu_to_le16(res);
6639 rsp.status = cpu_to_le16(stat);
fc7f8a7e 6640 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 6641 sizeof(rsp), &rsp);
2d369359
MM		 6642
6643 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6644 res == L2CAP_CR_SUCCESS) {
6645 char buf[128];
6646 set_bit(CONF_REQ_SENT, &chan->conf_state);
6647 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6648 L2CAP_CONF_REQ,
6649 l2cap_build_conf_req(chan, buf),
6650 buf);
6651 chan->num_conf_req++;
6652 }
b1235d79 6653 }
1da177e4 6654
6be36555 6655 l2cap_chan_unlock(chan);
1da177e4
LT		 6656 }
6657
3df91ea2 6658 mutex_unlock(&conn->chan_lock);
b1235d79 6659
1da177e4
LT		 6660 return 0;
6661}
6662
686ebf28 6663int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 6664{
6665 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 6666 struct l2cap_hdr *hdr;
6667 int len;
1da177e4 6668
1d13a254
AE		 6669 /* For AMP controller do not create l2cap conn */
6670 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6671 goto drop;
1da177e4 6672
5a08ecce 6673 if (!conn)
baf43251 6674 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 6675
6676 if (!conn)
1da177e4
LT		 6677 goto drop;
6678
6679 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6680
d73a0988
AE		 6681 switch (flags) {
6682 case ACL_START:
6683 case ACL_START_NO_FLUSH:
6684 case ACL_COMPLETE:
1da177e4
LT		 6685 if (conn->rx_len) {
6686 BT_ERR("Unexpected start frame (len %d)", skb->len);
6687 kfree_skb(conn->rx_skb);
6688 conn->rx_skb = NULL;
6689 conn->rx_len = 0;
6690 l2cap_conn_unreliable(conn, ECOMM);
6691 }
6692
aae7fe22
AE		 6693 /* Start fragment always begin with Basic L2CAP header */
6694 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 6695 BT_ERR("Frame is too short (len %d)", skb->len);
6696 l2cap_conn_unreliable(conn, ECOMM);
6697 goto drop;
6698 }
6699
6700 hdr = (struct l2cap_hdr *) skb->data;
6701 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6702
6703 if (len == skb->len) {
6704 /* Complete frame received */
6705 l2cap_recv_frame(conn, skb);
6706 return 0;
6707 }
6708
6709 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6710
6711 if (skb->len > len) {
6712 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 6713 skb->len, len);
1da177e4
LT		 6714 l2cap_conn_unreliable(conn, ECOMM);
6715 goto drop;
6716 }
6717
6718 /* Allocate skb for the complete frame (with header) */
8bcde1f2 6719 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 6720 if (!conn->rx_skb)
1da177e4
LT		 6721 goto drop;
6722
d626f62b 6723 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6724 skb->len);
1da177e4 6725 conn->rx_len = len - skb->len;
d73a0988
AE		 6726 break;
6727
6728 case ACL_CONT:
1da177e4
LT		 6729 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6730
6731 if (!conn->rx_len) {
6732 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6733 l2cap_conn_unreliable(conn, ECOMM);
6734 goto drop;
6735 }
6736
6737 if (skb->len > conn->rx_len) {
6738 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 6739 skb->len, conn->rx_len);
1da177e4
LT		 6740 kfree_skb(conn->rx_skb);
6741 conn->rx_skb = NULL;
6742 conn->rx_len = 0;
6743 l2cap_conn_unreliable(conn, ECOMM);
6744 goto drop;
6745 }
6746
d626f62b 6747 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6748 skb->len);
1da177e4
LT		 6749 conn->rx_len -= skb->len;
6750
6751 if (!conn->rx_len) {
6752 /* Complete frame received */
6753 l2cap_recv_frame(conn, conn->rx_skb);
6754 conn->rx_skb = NULL;
6755 }
d73a0988 6756 break;
1da177e4
LT		 6757 }
6758
6759drop:
6760 kfree_skb(skb);
6761 return 0;
6762}
6763
aef7d97c 6764static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 6765{
23691d75 6766 struct l2cap_chan *c;
1da177e4 6767
333055f2 6768 read_lock(&chan_list_lock);
1da177e4 6769
23691d75
GP		 6770 list_for_each_entry(c, &chan_list, global_l) {
6771 struct sock *sk = c->sk;
101545f6 6772
fcb73338
AE		 6773 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
6774 &bt_sk(sk)->src, &bt_sk(sk)->dst,
6775 c->state, __le16_to_cpu(c->psm),
6776 c->scid, c->dcid, c->imtu, c->omtu,
6777 c->sec_level, c->mode);
61e1b4b7 6778 }
1da177e4 6779
333055f2 6780 read_unlock(&chan_list_lock);
1da177e4 6781
aef7d97c 6782 return 0;
1da177e4
LT		 6783}
6784
aef7d97c
MH		 6785static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6786{
6787 return single_open(file, l2cap_debugfs_show, inode->i_private);
6788}
6789
6790static const struct file_operations l2cap_debugfs_fops = {
6791 .open = l2cap_debugfs_open,
6792 .read = seq_read,
6793 .llseek = seq_lseek,
6794 .release = single_release,
6795};
6796
6797static struct dentry *l2cap_debugfs;
1da177e4 6798
64274518 6799int __init l2cap_init(void)
1da177e4
LT		 6800{
6801 int err;
be9d1227 6802
bb58f747 6803 err = l2cap_init_sockets();
1da177e4
LT		 6804 if (err < 0)
6805 return err;
6806
aef7d97c 6807 if (bt_debugfs) {
2d792818
GP		 6808 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6809 NULL, &l2cap_debugfs_fops);
aef7d97c
MH		 6810 if (!l2cap_debugfs)
6811 BT_ERR("Failed to create L2CAP debug file");
6812 }
1da177e4 6813
1da177e4 6814 return 0;
1da177e4
LT		 6815}
6816
64274518 6817void l2cap_exit(void)
1da177e4 6818{
aef7d97c 6819 debugfs_remove(l2cap_debugfs);
bb58f747 6820 l2cap_cleanup_sockets();
1da177e4
LT		 6821}
6822
d1c4a17d
GP		 6823module_param(disable_ertm, bool, 0644);
6824MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux 6.x block layer and io_uring tree(s)