projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Bluetooth: Add public address configration for Broadcom USB devices
[deliverable/linux.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>
7ef9fbf0 39
ac4b7236 40#include "smp.h"
7024728e 41#include "a2mp.h"
7ef9fbf0 42#include "amp.h"
1da177e4 43
0f1bfe4e
JH		 44#define LE_FLOWCTL_MAX_CREDITS 65535
45
d1de6d46 46bool disable_ertm;
f0709e03 47
547d1032 48static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
d40bffbc 49static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, };
1da177e4 50
b5ad8b7f
JB		 51static LIST_HEAD(chan_list);
52static DEFINE_RWLOCK(chan_list_lock);
1da177e4 53
f15b8ecf
JH		 54static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
55static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
56
1da177e4 57static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 58 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 59static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 60 void *data);
710f9b0a 61static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 62static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 63
d660366d 64static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 65 struct sk_buff_head *skbs, u8 event);
608bcc6d 66
4f1654e0
MH		 67static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
68{
69 if (hcon->type == LE_LINK) {
70 if (type == ADDR_LE_DEV_PUBLIC)
71 return BDADDR_LE_PUBLIC;
72 else
73 return BDADDR_LE_RANDOM;
74 }
75
76 return BDADDR_BREDR;
77}
78
0139418c 79/* ---- L2CAP channels ---- */
71ba0e56 80
2d792818
GP		 81static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
82 u16 cid)
0139418c 83{
3df91ea2 84 struct l2cap_chan *c;
3d57dc68 85
3df91ea2
AE		 86 list_for_each_entry(c, &conn->chan_l, list) {
87 if (c->dcid == cid)
88 return c;
0139418c 89 }
3df91ea2 90 return NULL;
0139418c
MH		 91}
92
2d792818
GP		 93static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
94 u16 cid)
0139418c 95{
3df91ea2 96 struct l2cap_chan *c;
3d57dc68 97
3df91ea2
AE		 98 list_for_each_entry(c, &conn->chan_l, list) {
99 if (c->scid == cid)
100 return c;
0139418c 101 }
3df91ea2 102 return NULL;
0139418c
MH		 103}
104
105/* Find channel with given SCID.
ef191ade 106 * Returns locked channel. */
2d792818
GP		 107static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
108 u16 cid)
0139418c 109{
48454079 110 struct l2cap_chan *c;
baa7e1fa 111
3df91ea2 112 mutex_lock(&conn->chan_lock);
baa7e1fa 113 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 114 if (c)
115 l2cap_chan_lock(c);
3df91ea2
AE		 116 mutex_unlock(&conn->chan_lock);
117
48454079 118 return c;
0139418c
MH		 119}
120
b1a130b7
MM		 121/* Find channel with given DCID.
122 * Returns locked channel.
123 */
124static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
125 u16 cid)
126{
127 struct l2cap_chan *c;
128
129 mutex_lock(&conn->chan_lock);
130 c = __l2cap_get_chan_by_dcid(conn, cid);
131 if (c)
132 l2cap_chan_lock(c);
133 mutex_unlock(&conn->chan_lock);
134
135 return c;
136}
137
2d792818
GP		 138static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
139 u8 ident)
0139418c 140{
3df91ea2 141 struct l2cap_chan *c;
3d57dc68 142
3df91ea2
AE		 143 list_for_each_entry(c, &conn->chan_l, list) {
144 if (c->ident == ident)
145 return c;
0139418c 146 }
3df91ea2 147 return NULL;
0139418c
MH		 148}
149
5b155ef9
MM		 150static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
151 u8 ident)
152{
153 struct l2cap_chan *c;
154
155 mutex_lock(&conn->chan_lock);
156 c = __l2cap_get_chan_by_ident(conn, ident);
157 if (c)
158 l2cap_chan_lock(c);
159 mutex_unlock(&conn->chan_lock);
160
161 return c;
162}
163
23691d75 164static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 165{
23691d75 166 struct l2cap_chan *c;
9e4425ff 167
23691d75 168 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 169 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 170 return c;
9e4425ff 171 }
250938cb 172 return NULL;
9e4425ff
GP		 173}
174
175int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
176{
73b2ec18
GP		 177 int err;
178
333055f2 179 write_lock(&chan_list_lock);
9e4425ff 180
23691d75 181 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 182 err = -EADDRINUSE;
183 goto done;
9e4425ff
GP		 184 }
185
73b2ec18
GP		 186 if (psm) {
187 chan->psm = psm;
188 chan->sport = psm;
189 err = 0;
190 } else {
191 u16 p;
192
193 err = -EINVAL;
194 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 195 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 196 chan->psm = cpu_to_le16(p);
197 chan->sport = cpu_to_le16(p);
198 err = 0;
199 break;
200 }
201 }
9e4425ff 202
73b2ec18 203done:
333055f2 204 write_unlock(&chan_list_lock);
73b2ec18 205 return err;
9e4425ff 206}
6b8d4a6a 207EXPORT_SYMBOL_GPL(l2cap_add_psm);
9e4425ff
GP		 208
209int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
210{
333055f2 211 write_lock(&chan_list_lock);
9e4425ff
GP		 212
213 chan->scid = scid;
214
333055f2 215 write_unlock(&chan_list_lock);
9e4425ff
GP		 216
217 return 0;
218}
219
baa7e1fa 220static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 221{
e77af755 222 u16 cid, dyn_end;
0139418c 223
e77af755
JH		 224 if (conn->hcon->type == LE_LINK)
225 dyn_end = L2CAP_CID_LE_DYN_END;
226 else
227 dyn_end = L2CAP_CID_DYN_END;
228
229 for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) {
baa7e1fa 230 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 231 return cid;
232 }
233
234 return 0;
235}
236
f93fa273 237static void l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 238{
42d2d87c 239 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 240 state_to_string(state));
badaaa00 241
89bc500e 242 chan->state = state;
53f52121 243 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 244}
245
f8e73017
GP		 246static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
247 int state, int err)
2e0052e4 248{
f8e73017 249 chan->state = state;
53f52121 250 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 251}
252
253static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
254{
f8e73017 255 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 256}
257
4239d16f
MM		 258static void __set_retrans_timer(struct l2cap_chan *chan)
259{
260 if (!delayed_work_pending(&chan->monitor_timer) &&
261 chan->retrans_timeout) {
262 l2cap_set_timer(chan, &chan->retrans_timer,
263 msecs_to_jiffies(chan->retrans_timeout));
264 }
265}
266
267static void __set_monitor_timer(struct l2cap_chan *chan)
268{
269 __clear_retrans_timer(chan);
270 if (chan->monitor_timeout) {
271 l2cap_set_timer(chan, &chan->monitor_timer,
272 msecs_to_jiffies(chan->monitor_timeout));
273 }
274}
275
608bcc6d
MM		 276static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
277 u16 seq)
278{
279 struct sk_buff *skb;
280
281 skb_queue_walk(head, skb) {
282 if (bt_cb(skb)->control.txseq == seq)
283 return skb;
284 }
285
286 return NULL;
287}
288
3c588192
MM		 289/* ---- L2CAP sequence number lists ---- */
290
291/* For ERTM, ordered lists of sequence numbers must be tracked for
292 * SREJ requests that are received and for frames that are to be
293 * retransmitted. These seq_list functions implement a singly-linked
294 * list in an array, where membership in the list can also be checked
295 * in constant time. Items can also be added to the tail of the list
296 * and removed from the head in constant time, without further memory
297 * allocs or frees.
298 */
299
300static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
301{
302 size_t alloc_size, i;
303
304 /* Allocated size is a power of 2 to map sequence numbers
305 * (which may be up to 14 bits) in to a smaller array that is
306 * sized for the negotiated ERTM transmit windows.
307 */
308 alloc_size = roundup_pow_of_two(size);
309
310 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
311 if (!seq_list->list)
312 return -ENOMEM;
313
314 seq_list->mask = alloc_size - 1;
315 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
316 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
317 for (i = 0; i < alloc_size; i++)
318 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
319
320 return 0;
321}
322
323static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
324{
325 kfree(seq_list->list);
326}
327
328static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
329 u16 seq)
330{
331 /* Constant-time check for list membership */
332 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
333}
334
03a0c5d6 335static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
3c588192 336{
03a0c5d6 337 u16 seq = seq_list->head;
3c588192
MM		 338 u16 mask = seq_list->mask;
339
03a0c5d6
JH		 340 seq_list->head = seq_list->list[seq & mask];
341 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
342
343 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
344 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
345 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192 346 }
3c588192 347
03a0c5d6 348 return seq;
3c588192
MM		 349}
350
351static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
352{
f522ae36 353 u16 i;
3c588192 354
f522ae36
GP		 355 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
356 return;
357
358 for (i = 0; i <= seq_list->mask; i++)
359 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
360
361 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
362 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 363}
364
365static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
366{
367 u16 mask = seq_list->mask;
368
369 /* All appends happen in constant time */
370
f522ae36
GP		 371 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
372 return;
3c588192 373
f522ae36
GP		 374 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
375 seq_list->head = seq;
376 else
377 seq_list->list[seq_list->tail & mask] = seq;
378
379 seq_list->tail = seq;
380 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 381}
382
721c4181 383static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 384{
721c4181 385 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 386 chan_timer.work);
3df91ea2 387 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 388 int reason;
389
e05dcc32 390 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 391
3df91ea2 392 mutex_lock(&conn->chan_lock);
6be36555 393 l2cap_chan_lock(chan);
ab07801d 394
89bc500e 395 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 396 reason = ECONNREFUSED;
89bc500e 397 else if (chan->state == BT_CONNECT &&
2d792818 398 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 399 reason = ECONNREFUSED;
400 else
401 reason = ETIMEDOUT;
402
0f852724 403 l2cap_chan_close(chan, reason);
ab07801d 404
6be36555 405 l2cap_chan_unlock(chan);
ab07801d 406
80b98027 407 chan->ops->close(chan);
3df91ea2
AE		 408 mutex_unlock(&conn->chan_lock);
409
371fd835 410 l2cap_chan_put(chan);
ab07801d
GP		 411}
412
eef1d9b6 413struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 414{
415 struct l2cap_chan *chan;
416
417 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
418 if (!chan)
419 return NULL;
420
c03b355e
AE		 421 mutex_init(&chan->lock);
422
333055f2 423 write_lock(&chan_list_lock);
23691d75 424 list_add(&chan->global_l, &chan_list);
333055f2 425 write_unlock(&chan_list_lock);
23691d75 426
721c4181 427 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 428
89bc500e
GP		 429 chan->state = BT_OPEN;
430
144ad330 431 kref_init(&chan->kref);
71ba0e56 432
2827011f
MM		 433 /* This flag is cleared in l2cap_chan_ready() */
434 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
435
eef1d9b6 436 BT_DBG("chan %p", chan);
abc545b8 437
48454079
GP		 438 return chan;
439}
6b8d4a6a 440EXPORT_SYMBOL_GPL(l2cap_chan_create);
48454079 441
144ad330 442static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 443{
144ad330
SS		 444 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
445
4af66c69
JK		 446 BT_DBG("chan %p", chan);
447
333055f2 448 write_lock(&chan_list_lock);
23691d75 449 list_del(&chan->global_l);
333055f2 450 write_unlock(&chan_list_lock);
23691d75 451
4af66c69 452 kfree(chan);
6ff5abbf
GP		 453}
454
30648372
JK		 455void l2cap_chan_hold(struct l2cap_chan *c)
456{
144ad330 457 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 458
144ad330 459 kref_get(&c->kref);
30648372
JK		 460}
461
462void l2cap_chan_put(struct l2cap_chan *c)
463{
144ad330 464 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 465
144ad330 466 kref_put(&c->kref, l2cap_chan_destroy);
30648372 467}
6b8d4a6a 468EXPORT_SYMBOL_GPL(l2cap_chan_put);
30648372 469
bd4b1653
AE		 470void l2cap_chan_set_defaults(struct l2cap_chan *chan)
471{
472 chan->fcs = L2CAP_FCS_CRC16;
473 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
474 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
475 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
6a5e8165
JR		 476 chan->remote_max_tx = chan->max_tx;
477 chan->remote_tx_win = chan->tx_win;
c20f8e35 478 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653 479 chan->sec_level = BT_SECURITY_LOW;
6a5e8165
JR		 480 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
481 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
482 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
483 chan->conf_state = 0;
bd4b1653
AE		 484
485 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
486}
6b8d4a6a 487EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
bd4b1653 488
0ce43ce6 489static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 490{
0ce43ce6
JH		 491 chan->sdu = NULL;
492 chan->sdu_last_frag = NULL;
493 chan->sdu_len = 0;
0cd75f7e 494 chan->tx_credits = 0;
f15b8ecf 495 chan->rx_credits = le_max_credits;
d1d79413 496 chan->mps = min_t(u16, chan->imtu, le_default_mps);
0ce43ce6
JH		 497
498 skb_queue_head_init(&chan->tx_q);
38319713
JH		 499}
500
93c3e8f5 501void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 502{
af05b30b 503 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 504 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 505
9f5a0d7b 506 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 507
8c1d787b 508 chan->conn = conn;
0139418c 509
5491120e
AE		 510 switch (chan->chan_type) {
511 case L2CAP_CHAN_CONN_ORIENTED:
21626e62
JH		 512 /* Alloc CID for connection-oriented socket */
513 chan->scid = l2cap_alloc_cid(conn);
514 if (conn->hcon->type == ACL_LINK)
0c1bc5c6 515 chan->omtu = L2CAP_DEFAULT_MTU;
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
2338a7e0
JH		 525 case L2CAP_CHAN_FIXED:
526 /* Caller will set CID and CID specific MTU values */
416fa752
AE		 527 break;
528
5491120e 529 default:
0139418c 530 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 531 chan->scid = L2CAP_CID_SIGNALING;
532 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 533 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 534 }
535
8f7975b1
AE		 536 chan->local_id = L2CAP_BESTEFFORT_ID;
537 chan->local_stype = L2CAP_SERV_BESTEFFORT;
538 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
539 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
540 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 541 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 542
371fd835 543 l2cap_chan_hold(chan);
baa7e1fa 544
5ee9891d
JH		 545 hci_conn_hold(conn->hcon);
546
3df91ea2 547 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 548}
549
466f8004 550void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 551{
552 mutex_lock(&conn->chan_lock);
553 __l2cap_chan_add(conn, chan);
3df91ea2 554 mutex_unlock(&conn->chan_lock);
0139418c
MH		 555}
556
466f8004 557void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 558{
8c1d787b 559 struct l2cap_conn *conn = chan->conn;
0139418c 560
c9b66675 561 __clear_chan_timer(chan);
0139418c 562
49208c9c 563 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 564
8e87d142 565 if (conn) {
56f60984 566 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 567 /* Delete from channel list */
3df91ea2 568 list_del(&chan->list);
3d57dc68 569
371fd835 570 l2cap_chan_put(chan);
baa7e1fa 571
8c1d787b 572 chan->conn = NULL;
3cabbfda 573
2338a7e0 574 if (chan->scid != L2CAP_CID_A2MP)
76a68ba0 575 hci_conn_drop(conn->hcon);
56f60984
AE		 576
577 if (mgr && mgr->bredr_chan == chan)
578 mgr->bredr_chan = NULL;
0139418c
MH		 579 }
580
419e08c1
AE		 581 if (chan->hs_hchan) {
582 struct hci_chan *hs_hchan = chan->hs_hchan;
583
584 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
585 amp_disconnect_logical_link(hs_hchan);
586 }
587
b699ec0d 588 chan->ops->teardown(chan, err);
6be36555 589
2827011f 590 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 591 return;
2ead70b8 592
ee556f66
GP		 593 switch(chan->mode) {
594 case L2CAP_MODE_BASIC:
595 break;
c13ffa62 596
38319713 597 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 598 skb_queue_purge(&chan->tx_q);
38319713
JH		 599 break;
600
ee556f66 601 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 602 __clear_retrans_timer(chan);
603 __clear_monitor_timer(chan);
604 __clear_ack_timer(chan);
c13ffa62 605
f1c6775b 606 skb_queue_purge(&chan->srej_q);
c13ffa62 607
3c588192
MM		 608 l2cap_seq_list_free(&chan->srej_list);
609 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 610
611 /* fall through */
612
613 case L2CAP_MODE_STREAMING:
614 skb_queue_purge(&chan->tx_q);
615 break;
c13ffa62 616 }
ee556f66
GP		 617
618 return;
0139418c 619}
6b8d4a6a 620EXPORT_SYMBOL_GPL(l2cap_chan_del);
0139418c 621
387a33e3
JH		 622void l2cap_conn_update_id_addr(struct hci_conn *hcon)
623{
624 struct l2cap_conn *conn = hcon->l2cap_data;
625 struct l2cap_chan *chan;
626
627 mutex_lock(&conn->chan_lock);
628
629 list_for_each_entry(chan, &conn->chan_l, list) {
630 l2cap_chan_lock(chan);
631 bacpy(&chan->dst, &hcon->dst);
632 chan->dst_type = bdaddr_type(hcon, hcon->dst_type);
633 l2cap_chan_unlock(chan);
634 }
635
636 mutex_unlock(&conn->chan_lock);
637}
638
27e2d4c8
JH		 639static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
640{
641 struct l2cap_conn *conn = chan->conn;
642 struct l2cap_le_conn_rsp rsp;
643 u16 result;
644
645 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
646 result = L2CAP_CR_AUTHORIZATION;
647 else
648 result = L2CAP_CR_BAD_PSM;
649
650 l2cap_state_change(chan, BT_DISCONN);
651
652 rsp.dcid = cpu_to_le16(chan->scid);
653 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 654 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 655 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 656 rsp.result = cpu_to_le16(result);
657
658 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
659 &rsp);
660}
661
791d60f7
JH		 662static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
663{
664 struct l2cap_conn *conn = chan->conn;
665 struct l2cap_conn_rsp rsp;
666 u16 result;
667
668 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
669 result = L2CAP_CR_SEC_BLOCK;
670 else
671 result = L2CAP_CR_BAD_PSM;
672
673 l2cap_state_change(chan, BT_DISCONN);
674
675 rsp.scid = cpu_to_le16(chan->dcid);
676 rsp.dcid = cpu_to_le16(chan->scid);
677 rsp.result = cpu_to_le16(result);
dcf4adbf 678 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
791d60f7
JH		 679
680 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
681}
682
0f852724 683void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 684{
685 struct l2cap_conn *conn = chan->conn;
4519de9a 686
7eafc59e 687 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 688
89bc500e 689 switch (chan->state) {
4519de9a 690 case BT_LISTEN:
b699ec0d 691 chan->ops->teardown(chan, 0);
4519de9a
GP		 692 break;
693
694 case BT_CONNECTED:
695 case BT_CONFIG:
7b25c9b3 696 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
8d836d71 697 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 698 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 699 } else
700 l2cap_chan_del(chan, reason);
701 break;
702
703 case BT_CONNECT2:
791d60f7
JH		 704 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
705 if (conn->hcon->type == ACL_LINK)
706 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 707 else if (conn->hcon->type == LE_LINK)
708 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 709 }
710
711 l2cap_chan_del(chan, reason);
712 break;
713
714 case BT_CONNECT:
715 case BT_DISCONN:
716 l2cap_chan_del(chan, reason);
717 break;
718
719 default:
b699ec0d 720 chan->ops->teardown(chan, 0);
4519de9a
GP		 721 break;
722 }
723}
6b8d4a6a 724EXPORT_SYMBOL(l2cap_chan_close);
4519de9a 725
4343478f 726static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 727{
6a974b50
MH		 728 switch (chan->chan_type) {
729 case L2CAP_CHAN_RAW:
4343478f 730 switch (chan->sec_level) {
8556edd3 731 case BT_SECURITY_HIGH:
7d513e92 732 case BT_SECURITY_FIPS:
8556edd3
JH		 733 return HCI_AT_DEDICATED_BONDING_MITM;
734 case BT_SECURITY_MEDIUM:
735 return HCI_AT_DEDICATED_BONDING;
736 default:
737 return HCI_AT_NO_BONDING;
738 }
6a974b50 739 break;
3124b843 740 case L2CAP_CHAN_CONN_LESS:
dcf4adbf 741 if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) {
3124b843
MH		 742 if (chan->sec_level == BT_SECURITY_LOW)
743 chan->sec_level = BT_SECURITY_SDP;
744 }
7d513e92
MH		 745 if (chan->sec_level == BT_SECURITY_HIGH ||
746 chan->sec_level == BT_SECURITY_FIPS)
3124b843
MH		 747 return HCI_AT_NO_BONDING_MITM;
748 else
749 return HCI_AT_NO_BONDING;
750 break;
6a974b50 751 case L2CAP_CHAN_CONN_ORIENTED:
dcf4adbf 752 if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) {
6a974b50
MH		 753 if (chan->sec_level == BT_SECURITY_LOW)
754 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 755
7d513e92
MH		 756 if (chan->sec_level == BT_SECURITY_HIGH ||
757 chan->sec_level == BT_SECURITY_FIPS)
6a974b50
MH		 758 return HCI_AT_NO_BONDING_MITM;
759 else
760 return HCI_AT_NO_BONDING;
761 }
762 /* fall through */
763 default:
4343478f 764 switch (chan->sec_level) {
00ae4af9 765 case BT_SECURITY_HIGH:
7d513e92 766 case BT_SECURITY_FIPS:
8556edd3 767 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 768 case BT_SECURITY_MEDIUM:
8556edd3 769 return HCI_AT_GENERAL_BONDING;
00ae4af9 770 default:
8556edd3 771 return HCI_AT_NO_BONDING;
00ae4af9 772 }
6a974b50 773 break;
0684e5f9 774 }
8556edd3
JH		 775}
776
777/* Service level security */
d45fc423 778int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 779{
8c1d787b 780 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 781 __u8 auth_type;
782
a17de2fe
JH		 783 if (conn->hcon->type == LE_LINK)
784 return smp_conn_security(conn->hcon, chan->sec_level);
785
4343478f 786 auth_type = l2cap_get_auth_type(chan);
79d554a6 787
4343478f 788 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 789}
790
b5ad8b7f 791static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 792{
793 u8 id;
794
795 /* Get next available identificator.
796 * 1 - 128 are used by kernel.
797 * 129 - 199 are reserved.
798 * 200 - 254 are used by utilities like l2ping, etc.
799 */
800
333055f2 801 spin_lock(&conn->lock);
4e8402a3
MH		 802
803 if (++conn->tx_ident > 128)
804 conn->tx_ident = 1;
805
806 id = conn->tx_ident;
807
333055f2 808 spin_unlock(&conn->lock);
4e8402a3
MH		 809
810 return id;
811}
812
2d792818
GP		 813static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
814 void *data)
4e8402a3
MH		 815{
816 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 817 u8 flags;
4e8402a3
MH		 818
819 BT_DBG("code 0x%2.2x", code);
820
821 if (!skb)
9a9c6a34 822 return;
4e8402a3 823
e702112f
AE		 824 if (lmp_no_flush_capable(conn->hcon->hdev))
825 flags = ACL_START_NO_FLUSH;
826 else
827 flags = ACL_START;
828
14b12d0b 829 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 830 skb->priority = HCI_PRIO_MAX;
14b12d0b 831
73d80deb
LAD		 832 hci_send_acl(conn->hchan, skb, flags);
833}
834
02b0fbb9
MM		 835static bool __chan_is_moving(struct l2cap_chan *chan)
836{
837 return chan->move_state != L2CAP_MOVE_STABLE &&
838 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
839}
840
73d80deb
LAD		 841static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
842{
843 struct hci_conn *hcon = chan->conn->hcon;
844 u16 flags;
845
846 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 847 skb->priority);
73d80deb 848
d5f8a75d
MM		 849 if (chan->hs_hcon && !__chan_is_moving(chan)) {
850 if (chan->hs_hchan)
851 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
852 else
853 kfree_skb(skb);
854
855 return;
856 }
857
73d80deb 858 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 859 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 860 flags = ACL_START_NO_FLUSH;
861 else
862 flags = ACL_START;
14b12d0b 863
73d80deb
LAD		 864 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
865 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 866}
867
b76bbd66
MM		 868static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
869{
870 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
871 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
872
873 if (enh & L2CAP_CTRL_FRAME_TYPE) {
874 /* S-Frame */
875 control->sframe = 1;
876 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
877 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
878
879 control->sar = 0;
880 control->txseq = 0;
881 } else {
882 /* I-Frame */
883 control->sframe = 0;
884 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
885 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
886
887 control->poll = 0;
888 control->super = 0;
889 }
890}
891
b76bbd66
MM		 892static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
893{
894 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
895 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
896
897 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
898 /* S-Frame */
899 control->sframe = 1;
900 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
901 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
902
903 control->sar = 0;
904 control->txseq = 0;
905 } else {
906 /* I-Frame */
907 control->sframe = 0;
908 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
909 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
910
911 control->poll = 0;
912 control->super = 0;
913 }
914}
915
916static inline void __unpack_control(struct l2cap_chan *chan,
917 struct sk_buff *skb)
918{
919 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
920 __unpack_extended_control(get_unaligned_le32(skb->data),
921 &bt_cb(skb)->control);
cec8ab6e 922 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 923 } else {
924 __unpack_enhanced_control(get_unaligned_le16(skb->data),
925 &bt_cb(skb)->control);
cec8ab6e 926 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 927 }
928}
929
b5c6aaed
MM		 930static u32 __pack_extended_control(struct l2cap_ctrl *control)
931{
932 u32 packed;
933
934 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
935 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
936
937 if (control->sframe) {
938 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
939 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
940 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
941 } else {
942 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
943 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
944 }
945
946 return packed;
947}
948
949static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
950{
951 u16 packed;
952
953 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
954 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
955
956 if (control->sframe) {
957 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
958 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
959 packed |= L2CAP_CTRL_FRAME_TYPE;
960 } else {
961 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
962 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
963 }
964
965 return packed;
966}
967
b76bbd66
MM		 968static inline void __pack_control(struct l2cap_chan *chan,
969 struct l2cap_ctrl *control,
970 struct sk_buff *skb)
971{
972 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
973 put_unaligned_le32(__pack_extended_control(control),
974 skb->data + L2CAP_HDR_SIZE);
975 } else {
976 put_unaligned_le16(__pack_enhanced_control(control),
977 skb->data + L2CAP_HDR_SIZE);
978 }
979}
980
ba7aa64f
GP		 981static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
982{
983 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
984 return L2CAP_EXT_HDR_SIZE;
985 else
986 return L2CAP_ENH_HDR_SIZE;
987}
988
a67d7f6f
MM		 989static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
990 u32 control)
b5c6aaed
MM		 991{
992 struct sk_buff *skb;
993 struct l2cap_hdr *lh;
ba7aa64f 994 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 995
996 if (chan->fcs == L2CAP_FCS_CRC16)
997 hlen += L2CAP_FCS_SIZE;
998
a67d7f6f 999 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 1000
b5c6aaed 1001 if (!skb)
a67d7f6f 1002 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 1003
1004 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1005 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1006 lh->cid = cpu_to_le16(chan->dcid);
1007
a67d7f6f
MM		 1008 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1009 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1010 else
1011 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 1012
1013 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 1014 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 1015 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1016 }
1017
1018 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 1019 return skb;
1020}
1021
1022static void l2cap_send_sframe(struct l2cap_chan *chan,
1023 struct l2cap_ctrl *control)
1024{
1025 struct sk_buff *skb;
1026 u32 control_field;
1027
1028 BT_DBG("chan %p, control %p", chan, control);
1029
1030 if (!control->sframe)
1031 return;
1032
b99e13ad
MM		 1033 if (__chan_is_moving(chan))
1034 return;
1035
a67d7f6f
MM		 1036 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1037 !control->poll)
1038 control->final = 1;
1039
1040 if (control->super == L2CAP_SUPER_RR)
1041 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1042 else if (control->super == L2CAP_SUPER_RNR)
1043 set_bit(CONN_RNR_SENT, &chan->conn_state);
1044
1045 if (control->super != L2CAP_SUPER_SREJ) {
1046 chan->last_acked_seq = control->reqseq;
1047 __clear_ack_timer(chan);
1048 }
1049
1050 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1051 control->final, control->poll, control->super);
1052
1053 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1054 control_field = __pack_extended_control(control);
1055 else
1056 control_field = __pack_enhanced_control(control);
1057
1058 skb = l2cap_create_sframe_pdu(chan, control_field);
1059 if (!IS_ERR(skb))
1060 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1061}
1062
c9e3d5e0 1063static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1064{
c9e3d5e0
MM		 1065 struct l2cap_ctrl control;
1066
1067 BT_DBG("chan %p, poll %d", chan, poll);
1068
1069 memset(&control, 0, sizeof(control));
1070 control.sframe = 1;
1071 control.poll = poll;
1072
1073 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1074 control.super = L2CAP_SUPER_RNR;
1075 else
1076 control.super = L2CAP_SUPER_RR;
b5c6aaed 1077
c9e3d5e0
MM		 1078 control.reqseq = chan->buffer_seq;
1079 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1080}
1081
b4450035 1082static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1083{
c1360a1c 1084 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1085}
1086
1df7b17a 1087static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1088{
1df7b17a 1089 struct l2cap_conn *conn = chan->conn;
80d58d0b 1090 struct hci_dev *hdev;
1df7b17a
MH		 1091 bool amp_available = false;
1092
1093 if (!conn->hs_enabled)
1094 return false;
1095
1096 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1097 return false;
80d58d0b
MH		 1098
1099 read_lock(&hci_dev_list_lock);
1df7b17a 1100 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1101 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1102 test_bit(HCI_UP, &hdev->flags)) {
1103 amp_available = true;
1104 break;
1105 }
1106 }
80d58d0b
MH		 1107 read_unlock(&hci_dev_list_lock);
1108
1df7b17a
MH		 1109 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1110 return amp_available;
848566b3
MH		 1111
1112 return false;
93c3e8f5
AE		 1113}
1114
5ce66b59
AE		 1115static bool l2cap_check_efs(struct l2cap_chan *chan)
1116{
1117 /* Check EFS parameters */
1118 return true;
1119}
1120
2766be48 1121void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1122{
1123 struct l2cap_conn *conn = chan->conn;
1124 struct l2cap_conn_req req;
1125
1126 req.scid = cpu_to_le16(chan->scid);
1127 req.psm = chan->psm;
1128
1129 chan->ident = l2cap_get_ident(conn);
1130
1131 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1132
1133 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1134}
1135
8eb200bd
MM		 1136static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1137{
1138 struct l2cap_create_chan_req req;
1139 req.scid = cpu_to_le16(chan->scid);
1140 req.psm = chan->psm;
1141 req.amp_id = amp_id;
1142
1143 chan->ident = l2cap_get_ident(chan->conn);
1144
1145 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1146 sizeof(req), &req);
1147}
1148
02b0fbb9
MM		 1149static void l2cap_move_setup(struct l2cap_chan *chan)
1150{
1151 struct sk_buff *skb;
1152
1153 BT_DBG("chan %p", chan);
1154
1155 if (chan->mode != L2CAP_MODE_ERTM)
1156 return;
1157
1158 __clear_retrans_timer(chan);
1159 __clear_monitor_timer(chan);
1160 __clear_ack_timer(chan);
1161
1162 chan->retry_count = 0;
1163 skb_queue_walk(&chan->tx_q, skb) {
1164 if (bt_cb(skb)->control.retries)
1165 bt_cb(skb)->control.retries = 1;
1166 else
1167 break;
1168 }
1169
1170 chan->expected_tx_seq = chan->buffer_seq;
1171
1172 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1173 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1174 l2cap_seq_list_clear(&chan->retrans_list);
1175 l2cap_seq_list_clear(&chan->srej_list);
1176 skb_queue_purge(&chan->srej_q);
1177
1178 chan->tx_state = L2CAP_TX_STATE_XMIT;
1179 chan->rx_state = L2CAP_RX_STATE_MOVE;
1180
1181 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1182}
1183
5f3847a4
MM		 1184static void l2cap_move_done(struct l2cap_chan *chan)
1185{
1186 u8 move_role = chan->move_role;
1187 BT_DBG("chan %p", chan);
1188
1189 chan->move_state = L2CAP_MOVE_STABLE;
1190 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1191
1192 if (chan->mode != L2CAP_MODE_ERTM)
1193 return;
1194
1195 switch (move_role) {
1196 case L2CAP_MOVE_ROLE_INITIATOR:
1197 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1198 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1199 break;
1200 case L2CAP_MOVE_ROLE_RESPONDER:
1201 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1202 break;
1203 }
1204}
1205
9f0caeb1
VCG		 1206static void l2cap_chan_ready(struct l2cap_chan *chan)
1207{
2827011f 1208 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1209 chan->conf_state = 0;
1210 __clear_chan_timer(chan);
1211
0ce43ce6
JH		 1212 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1213 chan->ops->suspend(chan);
177f8f2b 1214
54a59aa2 1215 chan->state = BT_CONNECTED;
9f0caeb1 1216
fd83e2c2 1217 chan->ops->ready(chan);
9f0caeb1
VCG		 1218}
1219
f1496dee
JH		 1220static void l2cap_le_connect(struct l2cap_chan *chan)
1221{
1222 struct l2cap_conn *conn = chan->conn;
1223 struct l2cap_le_conn_req req;
1224
595177f3
JH		 1225 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1226 return;
1227
f1496dee
JH		 1228 req.psm = chan->psm;
1229 req.scid = cpu_to_le16(chan->scid);
1230 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1231 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1232 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1233
1234 chan->ident = l2cap_get_ident(conn);
1235
1236 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1237 sizeof(req), &req);
1238}
1239
1240static void l2cap_le_start(struct l2cap_chan *chan)
1241{
1242 struct l2cap_conn *conn = chan->conn;
1243
1244 if (!smp_conn_security(conn->hcon, chan->sec_level))
1245 return;
1246
1247 if (!chan->psm) {
1248 l2cap_chan_ready(chan);
1249 return;
1250 }
1251
1252 if (chan->state == BT_CONNECT)
1253 l2cap_le_connect(chan);
1254}
1255
93c3e8f5
AE		 1256static void l2cap_start_connection(struct l2cap_chan *chan)
1257{
1258 if (__amp_capable(chan)) {
1259 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1260 a2mp_discover_amp(chan);
f1496dee
JH		 1261 } else if (chan->conn->hcon->type == LE_LINK) {
1262 l2cap_le_start(chan);
93c3e8f5
AE		 1263 } else {
1264 l2cap_send_conn_req(chan);
1265 }
1266}
1267
fc7f8a7e 1268static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1269{
8c1d787b 1270 struct l2cap_conn *conn = chan->conn;
79d554a6 1271
9f0caeb1 1272 if (conn->hcon->type == LE_LINK) {
96ac34fb 1273 l2cap_le_start(chan);
9f0caeb1
VCG		 1274 return;
1275 }
1276
79d554a6 1277 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1278 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1279 return;
1280
d45fc423 1281 if (l2cap_chan_check_security(chan) &&
2d792818 1282 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1283 l2cap_start_connection(chan);
1284 }
79d554a6
MH		 1285 } else {
1286 struct l2cap_info_req req;
dcf4adbf 1287 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1288
1289 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1290 conn->info_ident = l2cap_get_ident(conn);
1291
ba13ccd9 1292 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1293
2d792818
GP		 1294 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1295 sizeof(req), &req);
79d554a6
MH		 1296 }
1297}
1298
cf6c2c0b
GP		 1299static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1300{
1301 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1302 if (!disable_ertm)
cf6c2c0b
GP		 1303 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1304
1305 switch (mode) {
1306 case L2CAP_MODE_ERTM:
1307 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1308 case L2CAP_MODE_STREAMING:
1309 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1310 default:
1311 return 0x00;
1312 }
1313}
1314
5e4e3972 1315static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1316{
5e4e3972 1317 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1318 struct l2cap_disconn_req req;
1319
c13ffa62
GP		 1320 if (!conn)
1321 return;
1322
aad3d0e3 1323 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1324 __clear_retrans_timer(chan);
1325 __clear_monitor_timer(chan);
1326 __clear_ack_timer(chan);
c13ffa62
GP		 1327 }
1328
2338a7e0 1329 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1330 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1331 return;
1332 }
1333
fe4128e0
GP		 1334 req.dcid = cpu_to_le16(chan->dcid);
1335 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1336 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1337 sizeof(req), &req);
c13ffa62 1338
f8e73017 1339 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1340}
1341
1da177e4 1342/* ---- L2CAP connections ---- */
4e8402a3
MH		 1343static void l2cap_conn_start(struct l2cap_conn *conn)
1344{
3df91ea2 1345 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1346
1347 BT_DBG("conn %p", conn);
1348
3df91ea2 1349 mutex_lock(&conn->chan_lock);
4e8402a3 1350
3df91ea2 1351 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1352 l2cap_chan_lock(chan);
4e8402a3 1353
715ec005 1354 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1355 l2cap_chan_unlock(chan);
79d554a6
MH		 1356 continue;
1357 }
1358
89bc500e 1359 if (chan->state == BT_CONNECT) {
d45fc423 1360 if (!l2cap_chan_check_security(chan) ||
2d792818 1361 !__l2cap_no_conn_pending(chan)) {
6be36555 1362 l2cap_chan_unlock(chan);
47731de7
GP		 1363 continue;
1364 }
79d554a6 1365
c1360a1c 1366 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1367 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1368 &chan->conf_state)) {
89bc500e 1369 l2cap_chan_close(chan, ECONNRESET);
6be36555 1370 l2cap_chan_unlock(chan);
47731de7 1371 continue;
b1235d79 1372 }
47731de7 1373
93c3e8f5 1374 l2cap_start_connection(chan);
47731de7 1375
89bc500e 1376 } else if (chan->state == BT_CONNECT2) {
79d554a6 1377 struct l2cap_conn_rsp rsp;
e9aeb2dd 1378 char buf[128];
fe4128e0
GP		 1379 rsp.scid = cpu_to_le16(chan->dcid);
1380 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1381
d45fc423 1382 if (l2cap_chan_check_security(chan)) {
bdc25783 1383 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
dcf4adbf
JP		 1384 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1385 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1386 chan->ops->defer(chan);
f66dc81f
MH		 1387
1388 } else {
acdcabf5 1389 l2cap_state_change(chan, BT_CONFIG);
dcf4adbf
JP		 1390 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1391 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1392 }
79d554a6 1393 } else {
dcf4adbf
JP		 1394 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1395 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1396 }
1397
fc7f8a7e 1398 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1399 sizeof(rsp), &rsp);
e9aeb2dd 1400
c1360a1c 1401 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1402 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1403 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1404 continue;
1405 }
1406
c1360a1c 1407 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1408 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1409 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1410 chan->num_conf_req++;
4e8402a3
MH		 1411 }
1412
6be36555 1413 l2cap_chan_unlock(chan);
4e8402a3
MH		 1414 }
1415
3df91ea2 1416 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1417}
1418
c2287681 1419/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1420 * Returns closest match, locked.
1421 */
d9b88702 1422static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1423 bdaddr_t *src,
1424 bdaddr_t *dst)
b62f328b 1425{
23691d75 1426 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1427
23691d75 1428 read_lock(&chan_list_lock);
b62f328b 1429
23691d75 1430 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1431 if (state && c->state != state)
b62f328b
VT		 1432 continue;
1433
23691d75 1434 if (c->scid == cid) {
c2287681
IY		 1435 int src_match, dst_match;
1436 int src_any, dst_any;
1437
b62f328b 1438 /* Exact match. */
7eafc59e
MH		 1439 src_match = !bacmp(&c->src, src);
1440 dst_match = !bacmp(&c->dst, dst);
c2287681 1441 if (src_match && dst_match) {
23691d75
GP		 1442 read_unlock(&chan_list_lock);
1443 return c;
1444 }
b62f328b
VT		 1445
1446 /* Closest match */
7eafc59e
MH		 1447 src_any = !bacmp(&c->src, BDADDR_ANY);
1448 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1449 if ((src_match && dst_any) || (src_any && dst_match) ||
1450 (src_any && dst_any))
23691d75 1451 c1 = c;
b62f328b
VT		 1452 }
1453 }
280f294f 1454
23691d75 1455 read_unlock(&chan_list_lock);
b62f328b 1456
23691d75 1457 return c1;
b62f328b
VT		 1458}
1459
1460static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1461{
cc8dba2b 1462 struct hci_conn *hcon = conn->hcon;
23691d75 1463 struct l2cap_chan *chan, *pchan;
cc8dba2b 1464 u8 dst_type;
b62f328b
VT		 1465
1466 BT_DBG("");
1467
1468 /* Check if we have socket listening on cid */
073d1cf3 1469 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
cc8dba2b 1470 &hcon->src, &hcon->dst);
23691d75 1471 if (!pchan)
b62f328b
VT		 1472 return;
1473
44f3b0fb
JH		 1474 /* Client ATT sockets should override the server one */
1475 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1476 return;
1477
cc8dba2b
MH		 1478 dst_type = bdaddr_type(hcon, hcon->dst_type);
1479
1480 /* If device is blocked, do not create a channel for it */
1481 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type))
1482 return;
1483
80afeb6c
MH		 1484 /* For LE slave connections, make sure the connection interval
1485 * is in the range of the minium and maximum interval that has
1486 * been configured for this connection. If not, then trigger
1487 * the connection update procedure.
1488 */
4dae2798 1489 if (!test_bit(HCI_CONN_MASTER, &hcon->flags) &&
80afeb6c
MH		 1490 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1491 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1492 struct l2cap_conn_param_update_req req;
1493
1494 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1495 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1496 req.latency = cpu_to_le16(hcon->le_conn_latency);
1497 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1498
1499 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1500 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1501 }
1502
8ffb9290 1503 l2cap_chan_lock(pchan);
62f3a2cf 1504
80b98027 1505 chan = pchan->ops->new_connection(pchan);
80808e43 1506 if (!chan)
b62f328b
VT		 1507 goto clean;
1508
cc8dba2b
MH		 1509 bacpy(&chan->src, &hcon->src);
1510 bacpy(&chan->dst, &hcon->dst);
1511 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1512 chan->dst_type = dst_type;
b62f328b 1513
44f3b0fb 1514 __l2cap_chan_add(conn, chan);
48454079 1515
b62f328b 1516clean:
8ffb9290 1517 l2cap_chan_unlock(pchan);
b62f328b
VT		 1518}
1519
4e8402a3
MH		 1520static void l2cap_conn_ready(struct l2cap_conn *conn)
1521{
48454079 1522 struct l2cap_chan *chan;
cc110922 1523 struct hci_conn *hcon = conn->hcon;
4e8402a3 1524
79d554a6 1525 BT_DBG("conn %p", conn);
4e8402a3 1526
d8729922
JH		 1527 /* For outgoing pairing which doesn't necessarily have an
1528 * associated socket (e.g. mgmt_pair_device).
1529 */
cc110922
VCG		 1530 if (hcon->out && hcon->type == LE_LINK)
1531 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1532
3df91ea2 1533 mutex_lock(&conn->chan_lock);
4e8402a3 1534
44f3b0fb
JH		 1535 if (hcon->type == LE_LINK)
1536 l2cap_le_conn_ready(conn);
1537
3df91ea2 1538 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1539
6be36555 1540 l2cap_chan_lock(chan);
4e8402a3 1541
2338a7e0 1542 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1543 l2cap_chan_unlock(chan);
1544 continue;
1545 }
1546
cc110922 1547 if (hcon->type == LE_LINK) {
f1496dee 1548 l2cap_le_start(chan);
63128451 1549 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
74e75740 1550 l2cap_chan_ready(chan);
b501d6a1 1551
1c244f79 1552 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1553 l2cap_do_start(chan);
1c244f79 1554 }
4e8402a3 1555
6be36555 1556 l2cap_chan_unlock(chan);
4e8402a3 1557 }
79d554a6 1558
3df91ea2 1559 mutex_unlock(&conn->chan_lock);
61a939c6
JH		 1560
1561 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1562}
1563
1564/* Notify sockets that we cannot guaranty reliability anymore */
1565static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1566{
48454079 1567 struct l2cap_chan *chan;
4e8402a3
MH		 1568
1569 BT_DBG("conn %p", conn);
1570
3df91ea2 1571 mutex_lock(&conn->chan_lock);
4e8402a3 1572
3df91ea2 1573 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1574 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1575 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1576 }
1577
3df91ea2 1578 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1579}
1580
f878fcad 1581static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1582{
f878fcad 1583 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1584 info_timer.work);
4e8402a3 1585
984947dc 1586 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1587 conn->info_ident = 0;
984947dc 1588
4e8402a3
MH		 1589 l2cap_conn_start(conn);
1590}
1591
2c8e1411
DH		 1592/*
1593 * l2cap_user
1594 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1595 * callback is called during registration. The ->remove callback is called
1596 * during unregistration.
1597 * An l2cap_user object can either be explicitly unregistered or when the
1598 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1599 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1600 * External modules must own a reference to the l2cap_conn object if they intend
1601 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1602 * any time if they don't.
1603 */
1604
1605int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1606{
1607 struct hci_dev *hdev = conn->hcon->hdev;
1608 int ret;
1609
1610 /* We need to check whether l2cap_conn is registered. If it is not, we
1611 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1612 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1613 * relies on the parent hci_conn object to be locked. This itself relies
1614 * on the hci_dev object to be locked. So we must lock the hci device
1615 * here, too. */
1616
1617 hci_dev_lock(hdev);
1618
1619 if (user->list.next || user->list.prev) {
1620 ret = -EINVAL;
1621 goto out_unlock;
1622 }
1623
1624 /* conn->hchan is NULL after l2cap_conn_del() was called */
1625 if (!conn->hchan) {
1626 ret = -ENODEV;
1627 goto out_unlock;
1628 }
1629
1630 ret = user->probe(conn, user);
1631 if (ret)
1632 goto out_unlock;
1633
1634 list_add(&user->list, &conn->users);
1635 ret = 0;
1636
1637out_unlock:
1638 hci_dev_unlock(hdev);
1639 return ret;
1640}
1641EXPORT_SYMBOL(l2cap_register_user);
1642
1643void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1644{
1645 struct hci_dev *hdev = conn->hcon->hdev;
1646
1647 hci_dev_lock(hdev);
1648
1649 if (!user->list.next || !user->list.prev)
1650 goto out_unlock;
1651
1652 list_del(&user->list);
1653 user->list.next = NULL;
1654 user->list.prev = NULL;
1655 user->remove(conn, user);
1656
1657out_unlock:
1658 hci_dev_unlock(hdev);
1659}
1660EXPORT_SYMBOL(l2cap_unregister_user);
1661
1662static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1663{
1664 struct l2cap_user *user;
1665
1666 while (!list_empty(&conn->users)) {
1667 user = list_first_entry(&conn->users, struct l2cap_user, list);
1668 list_del(&user->list);
1669 user->list.next = NULL;
1670 user->list.prev = NULL;
1671 user->remove(conn, user);
1672 }
1673}
1674
5d3de7df
VCG		 1675static void l2cap_conn_del(struct hci_conn *hcon, int err)
1676{
1677 struct l2cap_conn *conn = hcon->l2cap_data;
1678 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1679
1680 if (!conn)
1681 return;
1682
1683 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1684
1685 kfree_skb(conn->rx_skb);
1686
61a939c6 1687 skb_queue_purge(&conn->pending_rx);
7ab56c3a
JT		 1688
1689 /* We can not call flush_work(&conn->pending_rx_work) here since we
1690 * might block if we are running on a worker from the same workqueue
1691 * pending_rx_work is waiting on.
1692 */
1693 if (work_pending(&conn->pending_rx_work))
1694 cancel_work_sync(&conn->pending_rx_work);
61a939c6 1695
2c8e1411
DH		 1696 l2cap_unregister_all_users(conn);
1697
3df91ea2
AE		 1698 mutex_lock(&conn->chan_lock);
1699
5d3de7df
VCG		 1700 /* Kill channels */
1701 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1702 l2cap_chan_hold(chan);
6be36555
AE		 1703 l2cap_chan_lock(chan);
1704
5d3de7df 1705 l2cap_chan_del(chan, err);
6be36555
AE		 1706
1707 l2cap_chan_unlock(chan);
1708
80b98027 1709 chan->ops->close(chan);
61d6ef3e 1710 l2cap_chan_put(chan);
5d3de7df
VCG		 1711 }
1712
3df91ea2
AE		 1713 mutex_unlock(&conn->chan_lock);
1714
73d80deb
LAD		 1715 hci_chan_del(conn->hchan);
1716
5d3de7df 1717 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1718 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1719
51a8efd7 1720 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1721 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1722 smp_chan_destroy(conn);
d26a2345 1723 }
5d3de7df
VCG		 1724
1725 hcon->l2cap_data = NULL;
9c903e37
DH		 1726 conn->hchan = NULL;
1727 l2cap_conn_put(conn);
5d3de7df
VCG		 1728}
1729
6c9d42a1 1730static void security_timeout(struct work_struct *work)
5d3de7df 1731{
6c9d42a1 1732 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1733 security_timer.work);
5d3de7df 1734
d06cc416
JH		 1735 BT_DBG("conn %p", conn);
1736
1737 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1738 smp_chan_destroy(conn);
1739 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1740 }
5d3de7df
VCG		 1741}
1742
9c903e37
DH		 1743static void l2cap_conn_free(struct kref *ref)
1744{
1745 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1746
1747 hci_conn_put(conn->hcon);
1748 kfree(conn);
1749}
1750
1751void l2cap_conn_get(struct l2cap_conn *conn)
1752{
1753 kref_get(&conn->ref);
1754}
1755EXPORT_SYMBOL(l2cap_conn_get);
1756
1757void l2cap_conn_put(struct l2cap_conn *conn)
1758{
1759 kref_put(&conn->ref, l2cap_conn_free);
1760}
1761EXPORT_SYMBOL(l2cap_conn_put);
1762
1da177e4 1763/* ---- Socket interface ---- */
1da177e4 1764
c2287681 1765/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1766 * Returns closest match.
1767 */
c2287681
IY		 1768static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1769 bdaddr_t *src,
bf20fd4e
JH		 1770 bdaddr_t *dst,
1771 u8 link_type)
1da177e4 1772{
23691d75 1773 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1774
23691d75 1775 read_lock(&chan_list_lock);
e0f0cb56 1776
23691d75 1777 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1778 if (state && c->state != state)
1da177e4
LT		 1779 continue;
1780
bf20fd4e
JH		 1781 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1782 continue;
1783
1784 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1785 continue;
1786
23691d75 1787 if (c->psm == psm) {
c2287681
IY		 1788 int src_match, dst_match;
1789 int src_any, dst_any;
1790
1da177e4 1791 /* Exact match. */
7eafc59e
MH		 1792 src_match = !bacmp(&c->src, src);
1793 dst_match = !bacmp(&c->dst, dst);
c2287681 1794 if (src_match && dst_match) {
a7567b20 1795 read_unlock(&chan_list_lock);
23691d75
GP		 1796 return c;
1797 }
1da177e4
LT		 1798
1799 /* Closest match */
7eafc59e
MH		 1800 src_any = !bacmp(&c->src, BDADDR_ANY);
1801 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1802 if ((src_match && dst_any) || (src_any && dst_match) ||
1803 (src_any && dst_any))
23691d75 1804 c1 = c;
1da177e4
LT		 1805 }
1806 }
1da177e4 1807
23691d75 1808 read_unlock(&chan_list_lock);
e0f0cb56 1809
23691d75 1810 return c1;
1da177e4
LT		 1811}
1812
721c4181 1813static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1814{
721c4181 1815 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1816 monitor_timer.work);
e90bac06 1817
525cd185 1818 BT_DBG("chan %p", chan);
0e98958d 1819
6be36555
AE		 1820 l2cap_chan_lock(chan);
1821
80909e04 1822 if (!chan->conn) {
6be36555 1823 l2cap_chan_unlock(chan);
8d7e1c7f 1824 l2cap_chan_put(chan);
e90bac06
GP		 1825 return;
1826 }
1827
401bb1f7 1828 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1829
6be36555 1830 l2cap_chan_unlock(chan);
8d7e1c7f 1831 l2cap_chan_put(chan);
e90bac06
GP		 1832}
1833
721c4181 1834static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1835{
721c4181 1836 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1837 retrans_timer.work);
e90bac06 1838
49208c9c 1839 BT_DBG("chan %p", chan);
0e98958d 1840
6be36555
AE		 1841 l2cap_chan_lock(chan);
1842
80909e04
MM		 1843 if (!chan->conn) {
1844 l2cap_chan_unlock(chan);
1845 l2cap_chan_put(chan);
1846 return;
1847 }
6be36555 1848
401bb1f7 1849 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1850 l2cap_chan_unlock(chan);
8d7e1c7f 1851 l2cap_chan_put(chan);
e90bac06
GP		 1852}
1853
d660366d
GP		 1854static void l2cap_streaming_send(struct l2cap_chan *chan,
1855 struct sk_buff_head *skbs)
6840ed07 1856{
ccbb84af 1857 struct sk_buff *skb;
3733937d 1858 struct l2cap_ctrl *control;
6840ed07 1859
3733937d
MM		 1860 BT_DBG("chan %p, skbs %p", chan, skbs);
1861
b99e13ad
MM		 1862 if (__chan_is_moving(chan))
1863 return;
1864
3733937d
MM		 1865 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1866
1867 while (!skb_queue_empty(&chan->tx_q)) {
1868
1869 skb = skb_dequeue(&chan->tx_q);
1870
1871 bt_cb(skb)->control.retries = 1;
1872 control = &bt_cb(skb)->control;
1873
1874 control->reqseq = 0;
1875 control->txseq = chan->next_tx_seq;
1876
1877 __pack_control(chan, control, skb);
6840ed07 1878
47d1ec61 1879 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1880 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1881 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1882 }
1883
4343478f 1884 l2cap_do_send(chan, skb);
6840ed07 1885
b4400672 1886 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1887
836be934 1888 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1889 chan->frames_sent++;
6840ed07 1890 }
6840ed07
GP		 1891}
1892
67c9e840 1893static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1894{
1895 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1896 struct l2cap_ctrl *control;
1897 int sent = 0;
1898
1899 BT_DBG("chan %p", chan);
1c2acffb 1900
89bc500e 1901 if (chan->state != BT_CONNECTED)
c13ffa62 1902 return -ENOTCONN;
e90bac06 1903
94122bbe
MM		 1904 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1905 return 0;
1906
b99e13ad
MM		 1907 if (__chan_is_moving(chan))
1908 return 0;
1909
18a48e76
MM		 1910 while (chan->tx_send_head &&
1911 chan->unacked_frames < chan->remote_tx_win &&
1912 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1913
18a48e76 1914 skb = chan->tx_send_head;
e90bac06 1915
18a48e76
MM		 1916 bt_cb(skb)->control.retries = 1;
1917 control = &bt_cb(skb)->control;
95ffa978 1918
e2ab4353 1919 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1920 control->final = 1;
e2ab4353 1921
18a48e76
MM		 1922 control->reqseq = chan->buffer_seq;
1923 chan->last_acked_seq = chan->buffer_seq;
1924 control->txseq = chan->next_tx_seq;
1c2acffb 1925
18a48e76 1926 __pack_control(chan, control, skb);
e90bac06 1927
47d1ec61 1928 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1929 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1930 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1931 }
1932
18a48e76
MM		 1933 /* Clone after data has been modified. Data is assumed to be
1934 read-only (for locking purposes) on cloned sk_buffs.
1935 */
1936 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1937
18a48e76
MM		 1938 if (!tx_skb)
1939 break;
1c2acffb 1940
18a48e76 1941 __set_retrans_timer(chan);
836be934
AE		 1942
1943 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1944 chan->unacked_frames++;
6a026610 1945 chan->frames_sent++;
18a48e76 1946 sent++;
1c2acffb 1947
58d35f87
GP		 1948 if (skb_queue_is_last(&chan->tx_q, skb))
1949 chan->tx_send_head = NULL;
1c2acffb 1950 else
58d35f87 1951 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1952
1953 l2cap_do_send(chan, tx_skb);
b4400672 1954 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1955 }
1956
b4400672
AE		 1957 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1958 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1959
1960 return sent;
9e917af1
GP		 1961}
1962
e1fbd4c1
MM		 1963static void l2cap_ertm_resend(struct l2cap_chan *chan)
1964{
1965 struct l2cap_ctrl control;
1966 struct sk_buff *skb;
1967 struct sk_buff *tx_skb;
1968 u16 seq;
1969
1970 BT_DBG("chan %p", chan);
1971
1972 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1973 return;
1974
b99e13ad
MM		 1975 if (__chan_is_moving(chan))
1976 return;
1977
e1fbd4c1
MM		 1978 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1979 seq = l2cap_seq_list_pop(&chan->retrans_list);
1980
1981 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1982 if (!skb) {
1983 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1984 seq);
e1fbd4c1
MM		 1985 continue;
1986 }
1987
1988 bt_cb(skb)->control.retries++;
1989 control = bt_cb(skb)->control;
1990
1991 if (chan->max_tx != 0 &&
1992 bt_cb(skb)->control.retries > chan->max_tx) {
1993 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1994 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1995 l2cap_seq_list_clear(&chan->retrans_list);
1996 break;
1997 }
1998
1999 control.reqseq = chan->buffer_seq;
2000 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2001 control.final = 1;
2002 else
2003 control.final = 0;
2004
2005 if (skb_cloned(skb)) {
2006 /* Cloned sk_buffs are read-only, so we need a
2007 * writeable copy
2008 */
8bcde1f2 2009 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 2010 } else {
8bcde1f2 2011 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 2012 }
2013
2014 if (!tx_skb) {
2015 l2cap_seq_list_clear(&chan->retrans_list);
2016 break;
2017 }
2018
2019 /* Update skb contents */
2020 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2021 put_unaligned_le32(__pack_extended_control(&control),
2022 tx_skb->data + L2CAP_HDR_SIZE);
2023 } else {
2024 put_unaligned_le16(__pack_enhanced_control(&control),
2025 tx_skb->data + L2CAP_HDR_SIZE);
2026 }
2027
2028 if (chan->fcs == L2CAP_FCS_CRC16) {
2029 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2030 put_unaligned_le16(fcs, skb_put(tx_skb,
2031 L2CAP_FCS_SIZE));
2032 }
2033
2034 l2cap_do_send(chan, tx_skb);
2035
2036 BT_DBG("Resent txseq %d", control.txseq);
2037
2038 chan->last_acked_seq = chan->buffer_seq;
2039 }
2040}
2041
f80842a8
MM		 2042static void l2cap_retransmit(struct l2cap_chan *chan,
2043 struct l2cap_ctrl *control)
2044{
2045 BT_DBG("chan %p, control %p", chan, control);
2046
2047 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2048 l2cap_ertm_resend(chan);
2049}
2050
d2a7ac5d
MM		 2051static void l2cap_retransmit_all(struct l2cap_chan *chan,
2052 struct l2cap_ctrl *control)
2053{
e1fbd4c1
MM		 2054 struct sk_buff *skb;
2055
2056 BT_DBG("chan %p, control %p", chan, control);
2057
2058 if (control->poll)
2059 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2060
2061 l2cap_seq_list_clear(&chan->retrans_list);
2062
2063 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2064 return;
2065
2066 if (chan->unacked_frames) {
2067 skb_queue_walk(&chan->tx_q, skb) {
2068 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2069 skb == chan->tx_send_head)
e1fbd4c1
MM		 2070 break;
2071 }
2072
2073 skb_queue_walk_from(&chan->tx_q, skb) {
2074 if (skb == chan->tx_send_head)
2075 break;
2076
2077 l2cap_seq_list_append(&chan->retrans_list,
2078 bt_cb(skb)->control.txseq);
2079 }
2080
2081 l2cap_ertm_resend(chan);
2082 }
d2a7ac5d
MM		 2083}
2084
0a0aba42 2085static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2086{
0a0aba42
MM		 2087 struct l2cap_ctrl control;
2088 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2089 chan->last_acked_seq);
2090 int threshold;
9e917af1 2091
0a0aba42
MM		 2092 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2093 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2094
0a0aba42
MM		 2095 memset(&control, 0, sizeof(control));
2096 control.sframe = 1;
dfc909be 2097
0a0aba42
MM		 2098 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2099 chan->rx_state == L2CAP_RX_STATE_RECV) {
2100 __clear_ack_timer(chan);
2101 control.super = L2CAP_SUPER_RNR;
2102 control.reqseq = chan->buffer_seq;
2103 l2cap_send_sframe(chan, &control);
2104 } else {
2105 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2106 l2cap_ertm_send(chan);
2107 /* If any i-frames were sent, they included an ack */
2108 if (chan->buffer_seq == chan->last_acked_seq)
2109 frames_to_ack = 0;
2110 }
dfc909be 2111
c20f8e35 2112 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2113 * Calculate without mul or div
2114 */
c20f8e35 2115 threshold = chan->ack_win;
0a0aba42
MM		 2116 threshold += threshold << 1;
2117 threshold >>= 2;
2118
b4400672 2119 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2120 threshold);
2121
2122 if (frames_to_ack >= threshold) {
2123 __clear_ack_timer(chan);
2124 control.super = L2CAP_SUPER_RR;
2125 control.reqseq = chan->buffer_seq;
2126 l2cap_send_sframe(chan, &control);
2127 frames_to_ack = 0;
2128 }
1c2acffb 2129
0a0aba42
MM		 2130 if (frames_to_ack)
2131 __set_ack_timer(chan);
2132 }
b17e73bb
SJ		 2133}
2134
04124681
GP		 2135static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2136 struct msghdr *msg, int len,
2137 int count, struct sk_buff *skb)
1c2acffb 2138{
0952a57a 2139 struct l2cap_conn *conn = chan->conn;
1c2acffb 2140 struct sk_buff **frag;
90338947 2141 int sent = 0;
1da177e4 2142
0498878b
JR		 2143 if (chan->ops->memcpy_fromiovec(chan, skb_put(skb, count),
2144 msg->msg_iov, count))
1c2acffb 2145 return -EFAULT;
1da177e4
LT		 2146
2147 sent += count;
2148 len -= count;
2149
2150 /* Continuation fragments (no L2CAP header) */
2151 frag = &skb_shinfo(skb)->frag_list;
2152 while (len) {
fbe00700
GP		 2153 struct sk_buff *tmp;
2154
1da177e4
LT		 2155 count = min_t(unsigned int, conn->mtu, len);
2156
d9fbd02b 2157 tmp = chan->ops->alloc_skb(chan, 0, count,
fbe00700
GP		 2158 msg->msg_flags & MSG_DONTWAIT);
2159 if (IS_ERR(tmp))
2160 return PTR_ERR(tmp);
2161
2162 *frag = tmp;
2f7719ce 2163
0498878b
JR		 2164 if (chan->ops->memcpy_fromiovec(chan, skb_put(*frag, count),
2165 msg->msg_iov, count))
1c2acffb 2166 return -EFAULT;
1da177e4
LT		 2167
2168 sent += count;
2169 len -= count;
2170
2d0ed3d5
GP		 2171 skb->len += (*frag)->len;
2172 skb->data_len += (*frag)->len;
2173
1da177e4
LT		 2174 frag = &(*frag)->next;
2175 }
1da177e4
LT		 2176
2177 return sent;
1c2acffb 2178}
1da177e4 2179
5e59b791 2180static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
8d46321c 2181 struct msghdr *msg, size_t len)
1c2acffb 2182{
8c1d787b 2183 struct l2cap_conn *conn = chan->conn;
1c2acffb 2184 struct sk_buff *skb;
03a51213 2185 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2186 struct l2cap_hdr *lh;
2187
8d46321c
MH		 2188 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2189 __le16_to_cpu(chan->psm), len);
1c2acffb
GP		 2190
2191 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2192
d9fbd02b 2193 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2194 msg->msg_flags & MSG_DONTWAIT);
2195 if (IS_ERR(skb))
2196 return skb;
1c2acffb
GP		 2197
2198 /* Create L2CAP header */
2199 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2200 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2201 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2202 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2203
0952a57a 2204 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2205 if (unlikely(err < 0)) {
2206 kfree_skb(skb);
2207 return ERR_PTR(err);
2208 }
2209 return skb;
2210}
2211
5e59b791 2212static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
8d46321c 2213 struct msghdr *msg, size_t len)
1c2acffb 2214{
8c1d787b 2215 struct l2cap_conn *conn = chan->conn;
1c2acffb 2216 struct sk_buff *skb;
f2ba7fae 2217 int err, count;
1c2acffb
GP		 2218 struct l2cap_hdr *lh;
2219
b4400672 2220 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2221
f2ba7fae 2222 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2223
d9fbd02b 2224 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
90338947
GP		 2225 msg->msg_flags & MSG_DONTWAIT);
2226 if (IS_ERR(skb))
2227 return skb;
1c2acffb
GP		 2228
2229 /* Create L2CAP header */
2230 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2231 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2232 lh->len = cpu_to_le16(len);
1c2acffb 2233
0952a57a 2234 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2235 if (unlikely(err < 0)) {
2236 kfree_skb(skb);
2237 return ERR_PTR(err);
2238 }
2239 return skb;
2240}
2241
ab0ff76d 2242static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2243 struct msghdr *msg, size_t len,
2244 u16 sdulen)
1c2acffb 2245{
8c1d787b 2246 struct l2cap_conn *conn = chan->conn;
1c2acffb 2247 struct sk_buff *skb;
e4ca6d98 2248 int err, count, hlen;
1c2acffb
GP		 2249 struct l2cap_hdr *lh;
2250
b4400672 2251 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2252
0ee0d208
GP		 2253 if (!conn)
2254 return ERR_PTR(-ENOTCONN);
2255
ba7aa64f 2256 hlen = __ertm_hdr_size(chan);
e4ca6d98 2257
c74e560c 2258 if (sdulen)
03a51213 2259 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2260
47d1ec61 2261 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2262 hlen += L2CAP_FCS_SIZE;
fcc203c3 2263
1c2acffb 2264 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2265
d9fbd02b 2266 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2267 msg->msg_flags & MSG_DONTWAIT);
2268 if (IS_ERR(skb))
2269 return skb;
1c2acffb
GP		 2270
2271 /* Create L2CAP header */
2272 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2273 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2274 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2275
18a48e76
MM		 2276 /* Control header is populated later */
2277 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2278 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2279 else
2280 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2281
c74e560c 2282 if (sdulen)
03a51213 2283 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2284
0952a57a 2285 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2286 if (unlikely(err < 0)) {
2287 kfree_skb(skb);
2288 return ERR_PTR(err);
2289 }
e90bac06 2290
18a48e76 2291 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2292 bt_cb(skb)->control.retries = 0;
1c2acffb 2293 return skb;
1da177e4
LT		 2294}
2295
94122bbe
MM		 2296static int l2cap_segment_sdu(struct l2cap_chan *chan,
2297 struct sk_buff_head *seg_queue,
2298 struct msghdr *msg, size_t len)
c74e560c 2299{
c74e560c 2300 struct sk_buff *skb;
94122bbe
MM		 2301 u16 sdu_len;
2302 size_t pdu_len;
94122bbe 2303 u8 sar;
c74e560c 2304
b4400672 2305 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2306
94122bbe
MM		 2307 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2308 * so fragmented skbs are not used. The HCI layer's handling
2309 * of fragmented skbs is not compatible with ERTM's queueing.
2310 */
c74e560c 2311
94122bbe
MM		 2312 /* PDU size is derived from the HCI MTU */
2313 pdu_len = chan->conn->mtu;
c74e560c 2314
a549574d
MM		 2315 /* Constrain PDU size for BR/EDR connections */
2316 if (!chan->hs_hcon)
2317 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2318
2319 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2320 if (chan->fcs)
2321 pdu_len -= L2CAP_FCS_SIZE;
2322
ba7aa64f 2323 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2324
2325 /* Remote device may have requested smaller PDUs */
2326 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2327
2328 if (len <= pdu_len) {
2329 sar = L2CAP_SAR_UNSEGMENTED;
2330 sdu_len = 0;
2331 pdu_len = len;
2332 } else {
2333 sar = L2CAP_SAR_START;
2334 sdu_len = len;
2335 pdu_len -= L2CAP_SDULEN_SIZE;
2336 }
2337
2338 while (len > 0) {
2339 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2340
c74e560c 2341 if (IS_ERR(skb)) {
94122bbe 2342 __skb_queue_purge(seg_queue);
c74e560c
GP		 2343 return PTR_ERR(skb);
2344 }
2345
94122bbe
MM		 2346 bt_cb(skb)->control.sar = sar;
2347 __skb_queue_tail(seg_queue, skb);
2348
2349 len -= pdu_len;
2350 if (sdu_len) {
2351 sdu_len = 0;
2352 pdu_len += L2CAP_SDULEN_SIZE;
2353 }
2354
2355 if (len <= pdu_len) {
2356 sar = L2CAP_SAR_END;
2357 pdu_len = len;
2358 } else {
2359 sar = L2CAP_SAR_CONTINUE;
2360 }
c74e560c 2361 }
c74e560c 2362
f0f62799 2363 return 0;
c74e560c
GP		 2364}
2365
177f8f2b
JH		 2366static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2367 struct msghdr *msg,
2368 size_t len, u16 sdulen)
2369{
2370 struct l2cap_conn *conn = chan->conn;
2371 struct sk_buff *skb;
2372 int err, count, hlen;
2373 struct l2cap_hdr *lh;
2374
2375 BT_DBG("chan %p len %zu", chan, len);
2376
2377 if (!conn)
2378 return ERR_PTR(-ENOTCONN);
2379
2380 hlen = L2CAP_HDR_SIZE;
2381
2382 if (sdulen)
2383 hlen += L2CAP_SDULEN_SIZE;
2384
2385 count = min_t(unsigned int, (conn->mtu - hlen), len);
2386
d9fbd02b 2387 skb = chan->ops->alloc_skb(chan, hlen, count,
177f8f2b
JH		 2388 msg->msg_flags & MSG_DONTWAIT);
2389 if (IS_ERR(skb))
2390 return skb;
2391
2392 /* Create L2CAP header */
2393 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2394 lh->cid = cpu_to_le16(chan->dcid);
2395 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2396
2397 if (sdulen)
2398 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2399
2400 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2401 if (unlikely(err < 0)) {
2402 kfree_skb(skb);
2403 return ERR_PTR(err);
2404 }
2405
2406 return skb;
2407}
2408
2409static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2410 struct sk_buff_head *seg_queue,
2411 struct msghdr *msg, size_t len)
2412{
2413 struct sk_buff *skb;
2414 size_t pdu_len;
2415 u16 sdu_len;
2416
2417 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2418
2419 pdu_len = chan->conn->mtu - L2CAP_HDR_SIZE;
2420
2421 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2422
2423 sdu_len = len;
2424 pdu_len -= L2CAP_SDULEN_SIZE;
2425
2426 while (len > 0) {
2427 if (len <= pdu_len)
2428 pdu_len = len;
2429
2430 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2431 if (IS_ERR(skb)) {
2432 __skb_queue_purge(seg_queue);
2433 return PTR_ERR(skb);
2434 }
2435
2436 __skb_queue_tail(seg_queue, skb);
2437
2438 len -= pdu_len;
2439
2440 if (sdu_len) {
2441 sdu_len = 0;
2442 pdu_len += L2CAP_SDULEN_SIZE;
2443 }
2444 }
2445
2446 return 0;
2447}
2448
8d46321c 2449int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
9a91a04a 2450{
9a91a04a 2451 struct sk_buff *skb;
9a91a04a 2452 int err;
94122bbe 2453 struct sk_buff_head seg_queue;
9a91a04a 2454
31e8ce80
SWK		 2455 if (!chan->conn)
2456 return -ENOTCONN;
2457
9a91a04a 2458 /* Connectionless channel */
715ec005 2459 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
8d46321c 2460 skb = l2cap_create_connless_pdu(chan, msg, len);
9a91a04a
GP		 2461 if (IS_ERR(skb))
2462 return PTR_ERR(skb);
2463
ede81a2a
AK		 2464 /* Channel lock is released before requesting new skb and then
2465 * reacquired thus we need to recheck channel state.
2466 */
2467 if (chan->state != BT_CONNECTED) {
2468 kfree_skb(skb);
2469 return -ENOTCONN;
2470 }
2471
9a91a04a
GP		 2472 l2cap_do_send(chan, skb);
2473 return len;
2474 }
2475
2476 switch (chan->mode) {
38319713 2477 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2478 /* Check outgoing MTU */
2479 if (len > chan->omtu)
2480 return -EMSGSIZE;
2481
fad5fc89
JH		 2482 if (!chan->tx_credits)
2483 return -EAGAIN;
2484
177f8f2b
JH		 2485 __skb_queue_head_init(&seg_queue);
2486
2487 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2488
2489 if (chan->state != BT_CONNECTED) {
2490 __skb_queue_purge(&seg_queue);
2491 err = -ENOTCONN;
2492 }
2493
2494 if (err)
2495 return err;
2496
2497 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2498
2499 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2500 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2501 chan->tx_credits--;
2502 }
2503
2504 if (!chan->tx_credits)
2505 chan->ops->suspend(chan);
2506
2507 err = len;
2508
2509 break;
2510
fad5fc89 2511 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2512 /* Check outgoing MTU */
2513 if (len > chan->omtu)
2514 return -EMSGSIZE;
2515
2516 /* Create a basic PDU */
8d46321c 2517 skb = l2cap_create_basic_pdu(chan, msg, len);
9a91a04a
GP		 2518 if (IS_ERR(skb))
2519 return PTR_ERR(skb);
2520
ede81a2a
AK		 2521 /* Channel lock is released before requesting new skb and then
2522 * reacquired thus we need to recheck channel state.
2523 */
2524 if (chan->state != BT_CONNECTED) {
2525 kfree_skb(skb);
2526 return -ENOTCONN;
2527 }
2528
9a91a04a
GP		 2529 l2cap_do_send(chan, skb);
2530 err = len;
2531 break;
2532
2533 case L2CAP_MODE_ERTM:
2534 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2535 /* Check outgoing MTU */
2536 if (len > chan->omtu) {
2537 err = -EMSGSIZE;
2538 break;
2539 }
9a91a04a 2540
94122bbe 2541 __skb_queue_head_init(&seg_queue);
9a91a04a 2542
94122bbe
MM		 2543 /* Do segmentation before calling in to the state machine,
2544 * since it's possible to block while waiting for memory
2545 * allocation.
2546 */
2547 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2548
94122bbe
MM		 2549 /* The channel could have been closed while segmenting,
2550 * check that it is still connected.
2551 */
2552 if (chan->state != BT_CONNECTED) {
2553 __skb_queue_purge(&seg_queue);
2554 err = -ENOTCONN;
9a91a04a
GP		 2555 }
2556
94122bbe 2557 if (err)
9a91a04a 2558 break;
9a91a04a 2559
3733937d 2560 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2561 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2562 else
d660366d 2563 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2564
d660366d 2565 err = len;
9a91a04a 2566
94122bbe
MM		 2567 /* If the skbs were not queued for sending, they'll still be in
2568 * seg_queue and need to be purged.
2569 */
2570 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2571 break;
2572
2573 default:
2574 BT_DBG("bad state %1.1x", chan->mode);
2575 err = -EBADFD;
2576 }
2577
2578 return err;
2579}
6b8d4a6a 2580EXPORT_SYMBOL_GPL(l2cap_chan_send);
9a91a04a 2581
d2a7ac5d
MM		 2582static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2583{
bed68bde
MM		 2584 struct l2cap_ctrl control;
2585 u16 seq;
2586
b4400672 2587 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2588
2589 memset(&control, 0, sizeof(control));
2590 control.sframe = 1;
2591 control.super = L2CAP_SUPER_SREJ;
2592
2593 for (seq = chan->expected_tx_seq; seq != txseq;
2594 seq = __next_seq(chan, seq)) {
2595 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2596 control.reqseq = seq;
2597 l2cap_send_sframe(chan, &control);
2598 l2cap_seq_list_append(&chan->srej_list, seq);
2599 }
2600 }
2601
2602 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2603}
2604
2605static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2606{
bed68bde
MM		 2607 struct l2cap_ctrl control;
2608
2609 BT_DBG("chan %p", chan);
2610
2611 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2612 return;
2613
2614 memset(&control, 0, sizeof(control));
2615 control.sframe = 1;
2616 control.super = L2CAP_SUPER_SREJ;
2617 control.reqseq = chan->srej_list.tail;
2618 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2619}
2620
2621static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2622{
bed68bde
MM		 2623 struct l2cap_ctrl control;
2624 u16 initial_head;
2625 u16 seq;
2626
b4400672 2627 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2628
2629 memset(&control, 0, sizeof(control));
2630 control.sframe = 1;
2631 control.super = L2CAP_SUPER_SREJ;
2632
2633 /* Capture initial list head to allow only one pass through the list. */
2634 initial_head = chan->srej_list.head;
2635
2636 do {
2637 seq = l2cap_seq_list_pop(&chan->srej_list);
2638 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2639 break;
2640
2641 control.reqseq = seq;
2642 l2cap_send_sframe(chan, &control);
2643 l2cap_seq_list_append(&chan->srej_list, seq);
2644 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2645}
2646
608bcc6d
MM		 2647static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2648{
2649 struct sk_buff *acked_skb;
2650 u16 ackseq;
2651
b4400672 2652 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2653
2654 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2655 return;
2656
b4400672 2657 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2658 chan->expected_ack_seq, chan->unacked_frames);
2659
2660 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2661 ackseq = __next_seq(chan, ackseq)) {
2662
2663 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2664 if (acked_skb) {
2665 skb_unlink(acked_skb, &chan->tx_q);
2666 kfree_skb(acked_skb);
2667 chan->unacked_frames--;
2668 }
2669 }
2670
2671 chan->expected_ack_seq = reqseq;
2672
2673 if (chan->unacked_frames == 0)
2674 __clear_retrans_timer(chan);
2675
b4400672 2676 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2677}
2678
2679static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2680{
2681 BT_DBG("chan %p", chan);
2682
2683 chan->expected_tx_seq = chan->buffer_seq;
2684 l2cap_seq_list_clear(&chan->srej_list);
2685 skb_queue_purge(&chan->srej_q);
2686 chan->rx_state = L2CAP_RX_STATE_RECV;
2687}
2688
d660366d
GP		 2689static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2690 struct l2cap_ctrl *control,
2691 struct sk_buff_head *skbs, u8 event)
608bcc6d 2692{
608bcc6d
MM		 2693 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2694 event);
2695
2696 switch (event) {
2697 case L2CAP_EV_DATA_REQUEST:
2698 if (chan->tx_send_head == NULL)
2699 chan->tx_send_head = skb_peek(skbs);
2700
2701 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2702 l2cap_ertm_send(chan);
2703 break;
2704 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2705 BT_DBG("Enter LOCAL_BUSY");
2706 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2707
2708 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2709 /* The SREJ_SENT state must be aborted if we are to
2710 * enter the LOCAL_BUSY state.
2711 */
2712 l2cap_abort_rx_srej_sent(chan);
2713 }
2714
2715 l2cap_send_ack(chan);
2716
2717 break;
2718 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2719 BT_DBG("Exit LOCAL_BUSY");
2720 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2721
2722 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2723 struct l2cap_ctrl local_control;
2724
2725 memset(&local_control, 0, sizeof(local_control));
2726 local_control.sframe = 1;
2727 local_control.super = L2CAP_SUPER_RR;
2728 local_control.poll = 1;
2729 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2730 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2731
2732 chan->retry_count = 1;
2733 __set_monitor_timer(chan);
2734 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2735 }
2736 break;
2737 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2738 l2cap_process_reqseq(chan, control->reqseq);
2739 break;
2740 case L2CAP_EV_EXPLICIT_POLL:
2741 l2cap_send_rr_or_rnr(chan, 1);
2742 chan->retry_count = 1;
2743 __set_monitor_timer(chan);
2744 __clear_ack_timer(chan);
2745 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2746 break;
2747 case L2CAP_EV_RETRANS_TO:
2748 l2cap_send_rr_or_rnr(chan, 1);
2749 chan->retry_count = 1;
2750 __set_monitor_timer(chan);
2751 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2752 break;
2753 case L2CAP_EV_RECV_FBIT:
2754 /* Nothing to process */
2755 break;
2756 default:
2757 break;
2758 }
608bcc6d
MM		 2759}
2760
d660366d
GP		 2761static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2762 struct l2cap_ctrl *control,
2763 struct sk_buff_head *skbs, u8 event)
608bcc6d 2764{
608bcc6d
MM		 2765 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2766 event);
2767
2768 switch (event) {
2769 case L2CAP_EV_DATA_REQUEST:
2770 if (chan->tx_send_head == NULL)
2771 chan->tx_send_head = skb_peek(skbs);
2772 /* Queue data, but don't send. */
2773 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2774 break;
2775 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2776 BT_DBG("Enter LOCAL_BUSY");
2777 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2778
2779 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2780 /* The SREJ_SENT state must be aborted if we are to
2781 * enter the LOCAL_BUSY state.
2782 */
2783 l2cap_abort_rx_srej_sent(chan);
2784 }
2785
2786 l2cap_send_ack(chan);
2787
2788 break;
2789 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2790 BT_DBG("Exit LOCAL_BUSY");
2791 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2792
2793 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2794 struct l2cap_ctrl local_control;
2795 memset(&local_control, 0, sizeof(local_control));
2796 local_control.sframe = 1;
2797 local_control.super = L2CAP_SUPER_RR;
2798 local_control.poll = 1;
2799 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2800 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2801
2802 chan->retry_count = 1;
2803 __set_monitor_timer(chan);
2804 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2805 }
2806 break;
2807 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2808 l2cap_process_reqseq(chan, control->reqseq);
2809
2810 /* Fall through */
2811
2812 case L2CAP_EV_RECV_FBIT:
2813 if (control && control->final) {
2814 __clear_monitor_timer(chan);
2815 if (chan->unacked_frames > 0)
2816 __set_retrans_timer(chan);
2817 chan->retry_count = 0;
2818 chan->tx_state = L2CAP_TX_STATE_XMIT;
2819 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2820 }
2821 break;
2822 case L2CAP_EV_EXPLICIT_POLL:
2823 /* Ignore */
2824 break;
2825 case L2CAP_EV_MONITOR_TO:
2826 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2827 l2cap_send_rr_or_rnr(chan, 1);
2828 __set_monitor_timer(chan);
2829 chan->retry_count++;
2830 } else {
5e4e3972 2831 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2832 }
2833 break;
2834 default:
2835 break;
2836 }
608bcc6d
MM		 2837}
2838
d660366d
GP		 2839static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2840 struct sk_buff_head *skbs, u8 event)
608bcc6d 2841{
608bcc6d
MM		 2842 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2843 chan, control, skbs, event, chan->tx_state);
2844
2845 switch (chan->tx_state) {
2846 case L2CAP_TX_STATE_XMIT:
d660366d 2847 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2848 break;
2849 case L2CAP_TX_STATE_WAIT_F:
d660366d 2850 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2851 break;
2852 default:
2853 /* Ignore event */
2854 break;
2855 }
608bcc6d
MM		 2856}
2857
4b51dae9
MM		 2858static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2859 struct l2cap_ctrl *control)
2860{
2861 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2862 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2863}
2864
f80842a8
MM		 2865static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2866 struct l2cap_ctrl *control)
2867{
2868 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2869 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2870}
2871
1da177e4
LT		 2872/* Copy frame to all raw sockets on that connection */
2873static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2874{
1da177e4 2875 struct sk_buff *nskb;
48454079 2876 struct l2cap_chan *chan;
1da177e4
LT		 2877
2878 BT_DBG("conn %p", conn);
2879
3df91ea2 2880 mutex_lock(&conn->chan_lock);
3d57dc68 2881
3df91ea2 2882 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2883 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2884 continue;
2885
7f5396a7
GP		 2886 /* Don't send frame to the channel it came from */
2887 if (bt_cb(skb)->chan == chan)
1da177e4 2888 continue;
7f5396a7 2889
8bcde1f2 2890 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2891 if (!nskb)
1da177e4 2892 continue;
80b98027 2893 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2894 kfree_skb(nskb);
2895 }
3d57dc68 2896
3df91ea2 2897 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2898}
2899
2900/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2901static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2902 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2903{
2904 struct sk_buff *skb, **frag;
2905 struct l2cap_cmd_hdr *cmd;
2906 struct l2cap_hdr *lh;
2907 int len, count;
2908
b4400672
AE		 2909 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2910 conn, code, ident, dlen);
1da177e4 2911
300b962e
AL		 2912 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2913 return NULL;
2914
1da177e4
LT		 2915 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2916 count = min_t(unsigned int, conn->mtu, len);
2917
8bcde1f2 2918 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2919 if (!skb)
2920 return NULL;
2921
2922 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2923 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2924
2925 if (conn->hcon->type == LE_LINK)
dcf4adbf 2926 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2927 else
dcf4adbf 2928 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2929
2930 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2931 cmd->code = code;
2932 cmd->ident = ident;
aca3192c 2933 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2934
2935 if (dlen) {
2936 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2937 memcpy(skb_put(skb, count), data, count);
2938 data += count;
2939 }
2940
2941 len -= skb->len;
2942
2943 /* Continuation fragments (no L2CAP header) */
2944 frag = &skb_shinfo(skb)->frag_list;
2945 while (len) {
2946 count = min_t(unsigned int, conn->mtu, len);
2947
8bcde1f2 2948 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2949 if (!*frag)
2950 goto fail;
2951
2952 memcpy(skb_put(*frag, count), data, count);
2953
2954 len -= count;
2955 data += count;
2956
2957 frag = &(*frag)->next;
2958 }
2959
2960 return skb;
2961
2962fail:
2963 kfree_skb(skb);
2964 return NULL;
2965}
2966
2d792818
GP		 2967static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2968 unsigned long *val)
1da177e4
LT		 2969{
2970 struct l2cap_conf_opt *opt = *ptr;
2971 int len;
2972
2973 len = L2CAP_CONF_OPT_SIZE + opt->len;
2974 *ptr += len;
2975
2976 *type = opt->type;
2977 *olen = opt->len;
2978
2979 switch (opt->len) {
2980 case 1:
2981 *val = *((u8 *) opt->val);
2982 break;
2983
2984 case 2:
bfaaeb3e 2985 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2986 break;
2987
2988 case 4:
bfaaeb3e 2989 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2990 break;
2991
2992 default:
2993 *val = (unsigned long) opt->val;
2994 break;
2995 }
2996
b4400672 2997 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2998 return len;
2999}
3000
1da177e4
LT		 3001static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
3002{
3003 struct l2cap_conf_opt *opt = *ptr;
3004
b4400672 3005 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 3006
3007 opt->type = type;
3008 opt->len = len;
3009
3010 switch (len) {
3011 case 1:
3012 *((u8 *) opt->val) = val;
3013 break;
3014
3015 case 2:
4f8b691c 3016 put_unaligned_le16(val, opt->val);
1da177e4
LT		 3017 break;
3018
3019 case 4:
4f8b691c 3020 put_unaligned_le32(val, opt->val);
1da177e4
LT		 3021 break;
3022
3023 default:
3024 memcpy(opt->val, (void *) val, len);
3025 break;
3026 }
3027
3028 *ptr += L2CAP_CONF_OPT_SIZE + len;
3029}
3030
f89cef09
AE		 3031static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
3032{
3033 struct l2cap_conf_efs efs;
3034
1ec918ce 3035 switch (chan->mode) {
f89cef09
AE		 3036 case L2CAP_MODE_ERTM:
3037 efs.id = chan->local_id;
3038 efs.stype = chan->local_stype;
3039 efs.msdu = cpu_to_le16(chan->local_msdu);
3040 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
dcf4adbf
JP		 3041 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
3042 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3043 break;
3044
3045 case L2CAP_MODE_STREAMING:
3046 efs.id = 1;
3047 efs.stype = L2CAP_SERV_BESTEFFORT;
3048 efs.msdu = cpu_to_le16(chan->local_msdu);
3049 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3050 efs.acc_lat = 0;
3051 efs.flush_to = 0;
3052 break;
3053
3054 default:
3055 return;
3056 }
3057
3058 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3059 (unsigned long) &efs);
f89cef09
AE		 3060}
3061
721c4181 3062static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3063{
721c4181 3064 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3065 ack_timer.work);
3066 u16 frames_to_ack;
c1b4f43b 3067
2fb9b3d4
GP		 3068 BT_DBG("chan %p", chan);
3069
6be36555
AE		 3070 l2cap_chan_lock(chan);
3071
0362520b
MM		 3072 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3073 chan->last_acked_seq);
6be36555 3074
0362520b
MM		 3075 if (frames_to_ack)
3076 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3077
0362520b 3078 l2cap_chan_unlock(chan);
09bfb2ee 3079 l2cap_chan_put(chan);
c1b4f43b
GP		 3080}
3081
466f8004 3082int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3083{
3c588192
MM		 3084 int err;
3085
105bdf9e
MM		 3086 chan->next_tx_seq = 0;
3087 chan->expected_tx_seq = 0;
42e5c802 3088 chan->expected_ack_seq = 0;
6a026610 3089 chan->unacked_frames = 0;
42e5c802 3090 chan->buffer_seq = 0;
6a026610 3091 chan->frames_sent = 0;
105bdf9e
MM		 3092 chan->last_acked_seq = 0;
3093 chan->sdu = NULL;
3094 chan->sdu_last_frag = NULL;
3095 chan->sdu_len = 0;
3096
d34c34fb
MM		 3097 skb_queue_head_init(&chan->tx_q);
3098
6ed971ca
MH		 3099 chan->local_amp_id = AMP_ID_BREDR;
3100 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3101 chan->move_state = L2CAP_MOVE_STABLE;
3102 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3103
105bdf9e
MM		 3104 if (chan->mode != L2CAP_MODE_ERTM)
3105 return 0;
3106
3107 chan->rx_state = L2CAP_RX_STATE_RECV;
3108 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3109
721c4181
GP		 3110 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3111 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3112 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3113
f1c6775b 3114 skb_queue_head_init(&chan->srej_q);
1890d36b 3115
3c588192
MM		 3116 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3117 if (err < 0)
3118 return err;
3119
9dc9affc
MM		 3120 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3121 if (err < 0)
3122 l2cap_seq_list_free(&chan->srej_list);
3123
3124 return err;
0565c1c2
GP		 3125}
3126
f2fcfcd6
GP		 3127static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3128{
3129 switch (mode) {
3130 case L2CAP_MODE_STREAMING:
3131 case L2CAP_MODE_ERTM:
3132 if (l2cap_mode_supported(mode, remote_feat_mask))
3133 return mode;
3134 /* fall through */
3135 default:
3136 return L2CAP_MODE_BASIC;
3137 }
3138}
3139
848566b3 3140static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3141{
848566b3 3142 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
6327eb98
AE		 3143}
3144
848566b3 3145static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3146{
848566b3 3147 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
f89cef09
AE		 3148}
3149
36c86c85
MM		 3150static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3151 struct l2cap_conf_rfc *rfc)
3152{
6ed971ca 3153 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3154 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3155
3156 /* Class 1 devices have must have ERTM timeouts
3157 * exceeding the Link Supervision Timeout. The
3158 * default Link Supervision Timeout for AMP
3159 * controllers is 10 seconds.
3160 *
3161 * Class 1 devices use 0xffffffff for their
3162 * best-effort flush timeout, so the clamping logic
3163 * will result in a timeout that meets the above
3164 * requirement. ERTM timeouts are 16-bit values, so
3165 * the maximum timeout is 65.535 seconds.
3166 */
3167
3168 /* Convert timeout to milliseconds and round */
3169 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3170
3171 /* This is the recommended formula for class 2 devices
3172 * that start ERTM timers when packets are sent to the
3173 * controller.
3174 */
3175 ertm_to = 3 * ertm_to + 500;
3176
3177 if (ertm_to > 0xffff)
3178 ertm_to = 0xffff;
3179
3180 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3181 rfc->monitor_timeout = rfc->retrans_timeout;
3182 } else {
dcf4adbf
JP		 3183 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3184 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
36c86c85
MM		 3185 }
3186}
3187
6327eb98
AE		 3188static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3189{
3190 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3191 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3192 /* use extended control field */
3193 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3194 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3195 } else {
6327eb98 3196 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3197 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3198 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3199 }
c20f8e35 3200 chan->ack_win = chan->tx_win;
6327eb98
AE		 3201}
3202
710f9b0a 3203static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3204{
1da177e4 3205 struct l2cap_conf_req *req = data;
0c1bc5c6 3206 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3207 void *ptr = req->data;
c8f79162 3208 u16 size;
1da177e4 3209
49208c9c 3210 BT_DBG("chan %p", chan);
1da177e4 3211
73ffa904 3212 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3213 goto done;
3214
0c1bc5c6 3215 switch (chan->mode) {
f2fcfcd6
GP		 3216 case L2CAP_MODE_STREAMING:
3217 case L2CAP_MODE_ERTM:
c1360a1c 3218 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3219 break;
85eb53c6 3220
848566b3 3221 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3222 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3223
2ba13ed6 3224 /* fall through */
f2fcfcd6 3225 default:
8c1d787b 3226 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3227 break;
3228 }
3229
3230done:
0c1bc5c6
GP		 3231 if (chan->imtu != L2CAP_DEFAULT_MTU)
3232 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3233
0c1bc5c6 3234 switch (chan->mode) {
65c7c491 3235 case L2CAP_MODE_BASIC:
8c1d787b 3236 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3237 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3238 break;
3239
62547752
GP		 3240 rfc.mode = L2CAP_MODE_BASIC;
3241 rfc.txwin_size = 0;
3242 rfc.max_transmit = 0;
3243 rfc.retrans_timeout = 0;
3244 rfc.monitor_timeout = 0;
3245 rfc.max_pdu_size = 0;
3246
63406504 3247 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3248 (unsigned long) &rfc);
65c7c491
MH		 3249 break;
3250
3251 case L2CAP_MODE_ERTM:
3252 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3253 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3254
3255 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3256
3257 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3258 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3259 L2CAP_FCS_SIZE);
c8f79162 3260 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3261
6327eb98
AE		 3262 l2cap_txwin_setup(chan);
3263
3264 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3265 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3266
63406504 3267 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3268 (unsigned long) &rfc);
63406504 3269
f89cef09
AE		 3270 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3271 l2cap_add_opt_efs(&ptr, chan);
3272
6327eb98
AE		 3273 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3274 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3275 chan->tx_win);
60918918
AE		 3276
3277 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3278 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3279 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3280 chan->fcs = L2CAP_FCS_NONE;
3281 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3282 chan->fcs);
3283 }
f2fcfcd6
GP		 3284 break;
3285
3286 case L2CAP_MODE_STREAMING:
273759e2 3287 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3288 rfc.mode = L2CAP_MODE_STREAMING;
3289 rfc.txwin_size = 0;
3290 rfc.max_transmit = 0;
3291 rfc.retrans_timeout = 0;
3292 rfc.monitor_timeout = 0;
c8f79162
AE		 3293
3294 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3295 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3296 L2CAP_FCS_SIZE);
c8f79162 3297 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3298
63406504 3299 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3300 (unsigned long) &rfc);
63406504 3301
f89cef09
AE		 3302 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3303 l2cap_add_opt_efs(&ptr, chan);
3304
60918918
AE		 3305 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3306 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3307 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3308 chan->fcs = L2CAP_FCS_NONE;
3309 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3310 chan->fcs);
3311 }
65c7c491
MH		 3312 break;
3313 }
1da177e4 3314
fe4128e0 3315 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3316 req->flags = cpu_to_le16(0);
1da177e4
LT		 3317
3318 return ptr - data;
3319}
3320
73ffa904 3321static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3322{
5dee9e7c
MH		 3323 struct l2cap_conf_rsp *rsp = data;
3324 void *ptr = rsp->data;
73ffa904
GP		 3325 void *req = chan->conf_req;
3326 int len = chan->conf_len;
5dee9e7c
MH		 3327 int type, hint, olen;
3328 unsigned long val;
6464f35f 3329 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3330 struct l2cap_conf_efs efs;
3331 u8 remote_efs = 0;
861d6882 3332 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3333 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3334 u16 size;
1da177e4 3335
73ffa904 3336 BT_DBG("chan %p", chan);
820ae1b8 3337
5dee9e7c
MH		 3338 while (len >= L2CAP_CONF_OPT_SIZE) {
3339 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3340
589d2746 3341 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3342 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3343
3344 switch (type) {
3345 case L2CAP_CONF_MTU:
861d6882 3346 mtu = val;
5dee9e7c
MH		 3347 break;
3348
3349 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3350 chan->flush_to = val;
5dee9e7c
MH		 3351 break;
3352
3353 case L2CAP_CONF_QOS:
3354 break;
3355
6464f35f
MH		 3356 case L2CAP_CONF_RFC:
3357 if (olen == sizeof(rfc))
3358 memcpy(&rfc, (void *) val, olen);
3359 break;
3360
fcc203c3
GP		 3361 case L2CAP_CONF_FCS:
3362 if (val == L2CAP_FCS_NONE)
f2592d3e 3363 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3364 break;
fcc203c3 3365
42dceae2
AE		 3366 case L2CAP_CONF_EFS:
3367 remote_efs = 1;
3368 if (olen == sizeof(efs))
3369 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3370 break;
3371
6327eb98 3372 case L2CAP_CONF_EWS:
848566b3 3373 if (!chan->conn->hs_enabled)
6327eb98 3374 return -ECONNREFUSED;
fcc203c3 3375
6327eb98
AE		 3376 set_bit(FLAG_EXT_CTRL, &chan->flags);
3377 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3378 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3379 chan->remote_tx_win = val;
fcc203c3
GP		 3380 break;
3381
5dee9e7c
MH		 3382 default:
3383 if (hint)
3384 break;
3385
3386 result = L2CAP_CONF_UNKNOWN;
3387 *((u8 *) ptr++) = type;
3388 break;
3389 }
3390 }
3391
73ffa904 3392 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3393 goto done;
3394
0c1bc5c6 3395 switch (chan->mode) {
f2fcfcd6
GP		 3396 case L2CAP_MODE_STREAMING:
3397 case L2CAP_MODE_ERTM:
c1360a1c 3398 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3399 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3400 chan->conn->feat_mask);
85eb53c6
GP		 3401 break;
3402 }
3403
42dceae2 3404 if (remote_efs) {
848566b3 3405 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3406 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3407 else
3408 return -ECONNREFUSED;
3409 }
3410
0c1bc5c6 3411 if (chan->mode != rfc.mode)
f2fcfcd6 3412 return -ECONNREFUSED;
742e519b 3413
f2fcfcd6 3414 break;
f2fcfcd6
GP		 3415 }
3416
3417done:
0c1bc5c6 3418 if (chan->mode != rfc.mode) {
f2fcfcd6 3419 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3420 rfc.mode = chan->mode;
f2fcfcd6 3421
73ffa904 3422 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3423 return -ECONNREFUSED;
3424
2d792818
GP		 3425 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3426 (unsigned long) &rfc);
f2fcfcd6
GP		 3427 }
3428
5dee9e7c
MH		 3429 if (result == L2CAP_CONF_SUCCESS) {
3430 /* Configure output options and let the other side know
3431 * which ones we don't like. */
3432
f2fcfcd6
GP		 3433 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3434 result = L2CAP_CONF_UNACCEPT;
3435 else {
0c1bc5c6 3436 chan->omtu = mtu;
c1360a1c 3437 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3438 }
0c1bc5c6 3439 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3440
42dceae2
AE		 3441 if (remote_efs) {
3442 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3443 efs.stype != L2CAP_SERV_NOTRAFIC &&
3444 efs.stype != chan->local_stype) {
42dceae2
AE		 3445
3446 result = L2CAP_CONF_UNACCEPT;
3447
3448 if (chan->num_conf_req >= 1)
3449 return -ECONNREFUSED;
3450
3451 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3452 sizeof(efs),
3453 (unsigned long) &efs);
0e8b207e 3454 } else {
3e6b3b95 3455 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3456 result = L2CAP_CONF_PENDING;
3457 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3458 }
3459 }
3460
f2fcfcd6
GP		 3461 switch (rfc.mode) {
3462 case L2CAP_MODE_BASIC:
47d1ec61 3463 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3464 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3465 break;
3466
3467 case L2CAP_MODE_ERTM:
6327eb98
AE		 3468 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3469 chan->remote_tx_win = rfc.txwin_size;
3470 else
3471 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3472
2c03a7a4 3473 chan->remote_max_tx = rfc.max_transmit;
1c762159 3474
c8f79162 3475 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3476 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3477 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3478 rfc.max_pdu_size = cpu_to_le16(size);
3479 chan->remote_mps = size;
f2fcfcd6 3480
36c86c85 3481 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3482
c1360a1c 3483 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3484
3485 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3486 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3487
42dceae2
AE		 3488 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3489 chan->remote_id = efs.id;
3490 chan->remote_stype = efs.stype;
3491 chan->remote_msdu = le16_to_cpu(efs.msdu);
3492 chan->remote_flush_to =
2d792818 3493 le32_to_cpu(efs.flush_to);
42dceae2 3494 chan->remote_acc_lat =
2d792818 3495 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3496 chan->remote_sdu_itime =
3497 le32_to_cpu(efs.sdu_itime);
3498 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3499 sizeof(efs),
3500 (unsigned long) &efs);
42dceae2 3501 }
f2fcfcd6
GP		 3502 break;
3503
3504 case L2CAP_MODE_STREAMING:
c8f79162 3505 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3506 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3507 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3508 rfc.max_pdu_size = cpu_to_le16(size);
3509 chan->remote_mps = size;
f2fcfcd6 3510
c1360a1c 3511 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3512
2d792818
GP		 3513 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3514 (unsigned long) &rfc);
68ae6639 3515
f2fcfcd6
GP		 3516 break;
3517
3518 default:
5dee9e7c 3519 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3520
6464f35f 3521 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3522 rfc.mode = chan->mode;
f2fcfcd6 3523 }
6464f35f 3524
f2fcfcd6 3525 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3526 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3527 }
fe4128e0 3528 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3529 rsp->result = cpu_to_le16(result);
dcf4adbf 3530 rsp->flags = cpu_to_le16(0);
5dee9e7c
MH		 3531
3532 return ptr - data;
1da177e4
LT		 3533}
3534
2d792818
GP		 3535static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3536 void *data, u16 *result)
f2fcfcd6 3537{
f2fcfcd6
GP		 3538 struct l2cap_conf_req *req = data;
3539 void *ptr = req->data;
3540 int type, olen;
3541 unsigned long val;
36e999a8 3542 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3543 struct l2cap_conf_efs efs;
f2fcfcd6 3544
fe4128e0 3545 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3546
3547 while (len >= L2CAP_CONF_OPT_SIZE) {
3548 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3549
3550 switch (type) {
3551 case L2CAP_CONF_MTU:
3552 if (val < L2CAP_DEFAULT_MIN_MTU) {
3553 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3554 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3555 } else
0c1bc5c6
GP		 3556 chan->imtu = val;
3557 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3558 break;
3559
3560 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3561 chan->flush_to = val;
f2fcfcd6 3562 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3563 2, chan->flush_to);
f2fcfcd6
GP		 3564 break;
3565
3566 case L2CAP_CONF_RFC:
3567 if (olen == sizeof(rfc))
3568 memcpy(&rfc, (void *)val, olen);
3569
c1360a1c 3570 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3571 rfc.mode != chan->mode)
f2fcfcd6
GP		 3572 return -ECONNREFUSED;
3573
47d1ec61 3574 chan->fcs = 0;
f2fcfcd6
GP		 3575
3576 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3577 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3578 break;
6327eb98
AE		 3579
3580 case L2CAP_CONF_EWS:
c20f8e35 3581 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3582 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3583 chan->tx_win);
6327eb98 3584 break;
66af7aaf
AE		 3585
3586 case L2CAP_CONF_EFS:
3587 if (olen == sizeof(efs))
3588 memcpy(&efs, (void *)val, olen);
3589
3590 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3591 efs.stype != L2CAP_SERV_NOTRAFIC &&
3592 efs.stype != chan->local_stype)
66af7aaf
AE		 3593 return -ECONNREFUSED;
3594
2d792818
GP		 3595 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3596 (unsigned long) &efs);
66af7aaf 3597 break;
cbabee78
AE		 3598
3599 case L2CAP_CONF_FCS:
3600 if (*result == L2CAP_CONF_PENDING)
3601 if (val == L2CAP_FCS_NONE)
f2592d3e 3602 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3603 &chan->conf_state);
3604 break;
f2fcfcd6
GP		 3605 }
3606 }
3607
0c1bc5c6 3608 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3609 return -ECONNREFUSED;
3610
0c1bc5c6 3611 chan->mode = rfc.mode;
6c2ea7a8 3612
0e8b207e 3613 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3614 switch (rfc.mode) {
3615 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3616 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3617 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3618 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3619 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3620 chan->ack_win = min_t(u16, chan->ack_win,
3621 rfc.txwin_size);
66af7aaf
AE		 3622
3623 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3624 chan->local_msdu = le16_to_cpu(efs.msdu);
3625 chan->local_sdu_itime =
2d792818 3626 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3627 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3628 chan->local_flush_to =
2d792818 3629 le32_to_cpu(efs.flush_to);
66af7aaf 3630 }
f2fcfcd6 3631 break;
66af7aaf 3632
f2fcfcd6 3633 case L2CAP_MODE_STREAMING:
47d1ec61 3634 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3635 }
3636 }
3637
fe4128e0 3638 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3639 req->flags = cpu_to_le16(0);
f2fcfcd6
GP		 3640
3641 return ptr - data;
3642}
3643
2d792818
GP		 3644static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3645 u16 result, u16 flags)
1da177e4
LT		 3646{
3647 struct l2cap_conf_rsp *rsp = data;
3648 void *ptr = rsp->data;
1da177e4 3649
fe4128e0 3650 BT_DBG("chan %p", chan);
1da177e4 3651
fe4128e0 3652 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3653 rsp->result = cpu_to_le16(result);
aca3192c 3654 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3655
3656 return ptr - data;
3657}
3658
27e2d4c8
JH		 3659void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3660{
3661 struct l2cap_le_conn_rsp rsp;
3662 struct l2cap_conn *conn = chan->conn;
3663
3664 BT_DBG("chan %p", chan);
3665
3666 rsp.dcid = cpu_to_le16(chan->scid);
3667 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3668 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3669 rsp.credits = cpu_to_le16(chan->rx_credits);
dcf4adbf 3670 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
27e2d4c8
JH		 3671
3672 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3673 &rsp);
3674}
3675
8c1d787b 3676void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3677{
3678 struct l2cap_conn_rsp rsp;
8c1d787b 3679 struct l2cap_conn *conn = chan->conn;
710f9b0a 3680 u8 buf[128];
439f34ac 3681 u8 rsp_code;
710f9b0a 3682
fe4128e0
GP		 3683 rsp.scid = cpu_to_le16(chan->dcid);
3684 rsp.dcid = cpu_to_le16(chan->scid);
dcf4adbf
JP		 3685 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3686 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3687
3688 if (chan->hs_hcon)
3689 rsp_code = L2CAP_CREATE_CHAN_RSP;
3690 else
3691 rsp_code = L2CAP_CONN_RSP;
3692
3693 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3694
3695 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3696
c1360a1c 3697 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3698 return;
3699
710f9b0a 3700 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3701 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3702 chan->num_conf_req++;
3703}
3704
47d1ec61 3705static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3706{
7b1c0049
GP		 3707 int type, olen;
3708 unsigned long val;
c20f8e35
MM		 3709 /* Use sane default values in case a misbehaving remote device
3710 * did not send an RFC or extended window size option.
3711 */
3712 u16 txwin_ext = chan->ack_win;
3713 struct l2cap_conf_rfc rfc = {
3714 .mode = chan->mode,
dcf4adbf
JP		 3715 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3716 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
c20f8e35
MM		 3717 .max_pdu_size = cpu_to_le16(chan->imtu),
3718 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3719 };
7b1c0049 3720
47d1ec61 3721 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3722
0c1bc5c6 3723 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3724 return;
3725
3726 while (len >= L2CAP_CONF_OPT_SIZE) {
3727 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3728
c20f8e35
MM		 3729 switch (type) {
3730 case L2CAP_CONF_RFC:
3731 if (olen == sizeof(rfc))
3732 memcpy(&rfc, (void *)val, olen);
8f321f85 3733 break;
c20f8e35
MM		 3734 case L2CAP_CONF_EWS:
3735 txwin_ext = val;
3736 break;
3737 }
7b1c0049
GP		 3738 }
3739
7b1c0049
GP		 3740 switch (rfc.mode) {
3741 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3742 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3743 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3744 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3745 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3746 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3747 else
3748 chan->ack_win = min_t(u16, chan->ack_win,
3749 rfc.txwin_size);
7b1c0049
GP		 3750 break;
3751 case L2CAP_MODE_STREAMING:
47d1ec61 3752 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3753 }
3754}
3755
2d792818 3756static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3757 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3758 u8 *data)
4e8402a3 3759{
e2fd318e 3760 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3761
cb3b3152
JH		 3762 if (cmd_len < sizeof(*rej))
3763 return -EPROTO;
3764
e2fd318e 3765 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3766 return 0;
3767
3768 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3769 cmd->ident == conn->info_ident) {
17cd3f37 3770 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3771
3772 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3773 conn->info_ident = 0;
984947dc 3774
4e8402a3
MH		 3775 l2cap_conn_start(conn);
3776 }
3777
3778 return 0;
3779}
3780
1700915f
MM		 3781static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3782 struct l2cap_cmd_hdr *cmd,
3783 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3784{
1da177e4
LT		 3785 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3786 struct l2cap_conn_rsp rsp;
23691d75 3787 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3788 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3789
3790 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3791 __le16 psm = req->psm;
1da177e4 3792
097db76c 3793 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3794
3795 /* Check if we have socket listening on psm */
6f59b904 3796 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3797 &conn->hcon->dst, ACL_LINK);
23691d75 3798 if (!pchan) {
1da177e4
LT		 3799 result = L2CAP_CR_BAD_PSM;
3800 goto sendresp;
3801 }
3802
3df91ea2 3803 mutex_lock(&conn->chan_lock);
8ffb9290 3804 l2cap_chan_lock(pchan);
e0f0cb56 3805
e7c29cb1 3806 /* Check if the ACL is secure enough (if not SDP) */
dcf4adbf 3807 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3808 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3809 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3810 result = L2CAP_CR_SEC_BLOCK;
3811 goto response;
3812 }
3813
1da177e4
LT		 3814 result = L2CAP_CR_NO_MEM;
3815
2dfa1003
GP		 3816 /* Check if we already have channel with that dcid */
3817 if (__l2cap_get_chan_by_dcid(conn, scid))
3818 goto response;
3819
80b98027 3820 chan = pchan->ops->new_connection(pchan);
80808e43 3821 if (!chan)
1da177e4
LT		 3822 goto response;
3823
330b6c15
SS		 3824 /* For certain devices (ex: HID mouse), support for authentication,
3825 * pairing and bonding is optional. For such devices, inorder to avoid
3826 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3827 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3828 */
3829 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3830
7eafc59e
MH		 3831 bacpy(&chan->src, &conn->hcon->src);
3832 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 3833 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3834 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
fe4128e0
GP		 3835 chan->psm = psm;
3836 chan->dcid = scid;
1700915f 3837 chan->local_amp_id = amp_id;
1da177e4 3838
6be36555 3839 __l2cap_chan_add(conn, chan);
48454079 3840
fe4128e0 3841 dcid = chan->scid;
1da177e4 3842
8d836d71 3843 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3844
fc7f8a7e 3845 chan->ident = cmd->ident;
1da177e4 3846
984947dc 3847 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3848 if (l2cap_chan_check_security(chan)) {
bdc25783 3849 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3850 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3851 result = L2CAP_CR_PEND;
3852 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3853 chan->ops->defer(chan);
f66dc81f 3854 } else {
1700915f
MM		 3855 /* Force pending result for AMP controllers.
3856 * The connection will succeed after the
3857 * physical link is up.
3858 */
6ed971ca 3859 if (amp_id == AMP_ID_BREDR) {
f93fa273 3860 l2cap_state_change(chan, BT_CONFIG);
1700915f 3861 result = L2CAP_CR_SUCCESS;
6ed971ca 3862 } else {
f93fa273 3863 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3864 result = L2CAP_CR_PEND;
1700915f 3865 }
f66dc81f
MH		 3866 status = L2CAP_CS_NO_INFO;
3867 }
79d554a6 3868 } else {
f93fa273 3869 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3870 result = L2CAP_CR_PEND;
3871 status = L2CAP_CS_AUTHEN_PEND;
3872 }
3873 } else {
f93fa273 3874 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3875 result = L2CAP_CR_PEND;
3876 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3877 }
3878
1da177e4 3879response:
8ffb9290 3880 l2cap_chan_unlock(pchan);
3df91ea2 3881 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3882
3883sendresp:
aca3192c
YH		 3884 rsp.scid = cpu_to_le16(scid);
3885 rsp.dcid = cpu_to_le16(dcid);
3886 rsp.result = cpu_to_le16(result);
3887 rsp.status = cpu_to_le16(status);
4c89b6aa 3888 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3889
3890 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3891 struct l2cap_info_req info;
dcf4adbf 3892 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3893
3894 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3895 conn->info_ident = l2cap_get_ident(conn);
3896
ba13ccd9 3897 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3898
2d792818
GP		 3899 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3900 sizeof(info), &info);
79d554a6
MH		 3901 }
3902
c1360a1c 3903 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3904 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3905 u8 buf[128];
c1360a1c 3906 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3907 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3908 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3909 chan->num_conf_req++;
e9aeb2dd 3910 }
1700915f
MM		 3911
3912 return chan;
4c89b6aa 3913}
e9aeb2dd 3914
4c89b6aa 3915static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3916 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3917{
7b064eda
JK		 3918 struct hci_dev *hdev = conn->hcon->hdev;
3919 struct hci_conn *hcon = conn->hcon;
3920
cb3b3152
JH		 3921 if (cmd_len < sizeof(struct l2cap_conn_req))
3922 return -EPROTO;
3923
7b064eda
JK		 3924 hci_dev_lock(hdev);
3925 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3926 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3927 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3928 hcon->dst_type, 0, NULL, 0,
3929 hcon->dev_class);
3930 hci_dev_unlock(hdev);
3931
300229f9 3932 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3933 return 0;
3934}
3935
5909cf30 3936static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3937 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3938 u8 *data)
1da177e4
LT		 3939{
3940 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3941 u16 scid, dcid, result, status;
48454079 3942 struct l2cap_chan *chan;
1da177e4 3943 u8 req[128];
3df91ea2 3944 int err;
1da177e4 3945
cb3b3152
JH		 3946 if (cmd_len < sizeof(*rsp))
3947 return -EPROTO;
3948
1da177e4
LT		 3949 scid = __le16_to_cpu(rsp->scid);
3950 dcid = __le16_to_cpu(rsp->dcid);
3951 result = __le16_to_cpu(rsp->result);
3952 status = __le16_to_cpu(rsp->status);
3953
1b009c98 3954 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3955 dcid, scid, result, status);
1da177e4 3956
3df91ea2
AE		 3957 mutex_lock(&conn->chan_lock);
3958
1da177e4 3959 if (scid) {
3df91ea2
AE		 3960 chan = __l2cap_get_chan_by_scid(conn, scid);
3961 if (!chan) {
21870b52 3962 err = -EBADSLT;
3df91ea2
AE		 3963 goto unlock;
3964 }
1da177e4 3965 } else {
3df91ea2
AE		 3966 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3967 if (!chan) {
21870b52 3968 err = -EBADSLT;
3df91ea2
AE		 3969 goto unlock;
3970 }
1da177e4
LT		 3971 }
3972
3df91ea2
AE		 3973 err = 0;
3974
6be36555 3975 l2cap_chan_lock(chan);
48454079 3976
1da177e4
LT		 3977 switch (result) {
3978 case L2CAP_CR_SUCCESS:
89bc500e 3979 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3980 chan->ident = 0;
fe4128e0 3981 chan->dcid = dcid;
c1360a1c 3982 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3983
c1360a1c 3984 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3985 break;
3986
1da177e4 3987 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3988 l2cap_build_conf_req(chan, req), req);
73ffa904 3989 chan->num_conf_req++;
1da177e4
LT		 3990 break;
3991
3992 case L2CAP_CR_PEND:
c1360a1c 3993 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3994 break;
3995
3996 default:
48454079 3997 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3998 break;
3999 }
4000
6be36555 4001 l2cap_chan_unlock(chan);
3df91ea2
AE		 4002
4003unlock:
4004 mutex_unlock(&conn->chan_lock);
4005
4006 return err;
1da177e4
LT		 4007}
4008
47d1ec61 4009static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 4010{
4011 /* FCS is enabled only in ERTM or streaming mode, if one or both
4012 * sides request it.
4013 */
0c1bc5c6 4014 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 4015 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 4016 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 4017 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 4018}
4019
29d8a590
AE		 4020static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
4021 u8 ident, u16 flags)
4022{
4023 struct l2cap_conn *conn = chan->conn;
4024
4025 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
4026 flags);
4027
4028 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
4029 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
4030
4031 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4032 l2cap_build_conf_rsp(chan, data,
4033 L2CAP_CONF_SUCCESS, flags), data);
4034}
4035
662d652d
JH		 4036static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4037 u16 scid, u16 dcid)
4038{
4039 struct l2cap_cmd_rej_cid rej;
4040
dcf4adbf 4041 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
662d652d
JH		 4042 rej.scid = __cpu_to_le16(scid);
4043 rej.dcid = __cpu_to_le16(dcid);
4044
4045 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4046}
4047
2d792818
GP		 4048static inline int l2cap_config_req(struct l2cap_conn *conn,
4049 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4050 u8 *data)
1da177e4
LT		 4051{
4052 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4053 u16 dcid, flags;
4054 u8 rsp[64];
48454079 4055 struct l2cap_chan *chan;
3c588192 4056 int len, err = 0;
1da177e4 4057
cb3b3152
JH		 4058 if (cmd_len < sizeof(*req))
4059 return -EPROTO;
4060
1da177e4
LT		 4061 dcid = __le16_to_cpu(req->dcid);
4062 flags = __le16_to_cpu(req->flags);
4063
4064 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4065
baa7e1fa 4066 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4067 if (!chan) {
4068 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4069 return 0;
4070 }
1da177e4 4071
033b1142 4072 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4073 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4074 chan->dcid);
354f60a9 4075 goto unlock;
df6bd743 4076 }
354f60a9 4077
5dee9e7c 4078 /* Reject if config buffer is too small. */
88219a0f 4079 len = cmd_len - sizeof(*req);
cb3b3152 4080 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4081 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4082 l2cap_build_conf_rsp(chan, rsp,
4083 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4084 goto unlock;
4085 }
4086
4087 /* Store config. */
73ffa904
GP		 4088 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4089 chan->conf_len += len;
1da177e4 4090
59e54bd1 4091 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4092 /* Incomplete config. Send empty response. */
4093 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4094 l2cap_build_conf_rsp(chan, rsp,
4095 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4096 goto unlock;
4097 }
4098
4099 /* Complete config. */
73ffa904 4100 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4101 if (len < 0) {
5e4e3972 4102 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4103 goto unlock;
f2fcfcd6 4104 }
1da177e4 4105
1500109b 4106 chan->ident = cmd->ident;
5dee9e7c 4107 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4108 chan->num_conf_rsp++;
5dee9e7c 4109
5dee9e7c 4110 /* Reset config buffer. */
73ffa904 4111 chan->conf_len = 0;
5dee9e7c 4112
c1360a1c 4113 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4114 goto unlock;
4115
c1360a1c 4116 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4117 set_default_fcs(chan);
fcc203c3 4118
105bdf9e
MM		 4119 if (chan->mode == L2CAP_MODE_ERTM ||
4120 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4121 err = l2cap_ertm_init(chan);
4122
4123 if (err < 0)
5e4e3972 4124 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4125 else
4126 l2cap_chan_ready(chan);
0565c1c2 4127
876d9484
MH		 4128 goto unlock;
4129 }
4130
c1360a1c 4131 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4132 u8 buf[64];
1da177e4 4133 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4134 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4135 chan->num_conf_req++;
1da177e4
LT		 4136 }
4137
0e8b207e
AE		 4138 /* Got Conf Rsp PENDING from remote side and asume we sent
4139 Conf Rsp PENDING in the code above */
4140 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4141 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4142
4143 /* check compatibility */
4144
79de886d 4145 /* Send rsp for BR/EDR channel */
f351bc72 4146 if (!chan->hs_hcon)
79de886d
AE		 4147 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4148 else
4149 chan->ident = cmd->ident;
0e8b207e
AE		 4150 }
4151
1da177e4 4152unlock:
6be36555 4153 l2cap_chan_unlock(chan);
3c588192 4154 return err;
1da177e4
LT		 4155}
4156
2d792818 4157static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4158 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4159 u8 *data)
1da177e4
LT		 4160{
4161 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4162 u16 scid, flags, result;
48454079 4163 struct l2cap_chan *chan;
cb3b3152 4164 int len = cmd_len - sizeof(*rsp);
3c588192 4165 int err = 0;
1da177e4 4166
cb3b3152
JH		 4167 if (cmd_len < sizeof(*rsp))
4168 return -EPROTO;
4169
1da177e4
LT		 4170 scid = __le16_to_cpu(rsp->scid);
4171 flags = __le16_to_cpu(rsp->flags);
4172 result = __le16_to_cpu(rsp->result);
4173
61386cba
AE		 4174 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4175 result, len);
1da177e4 4176
baa7e1fa 4177 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4178 if (!chan)
1da177e4
LT		 4179 return 0;
4180
4181 switch (result) {
4182 case L2CAP_CONF_SUCCESS:
47d1ec61 4183 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4184 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4185 break;
4186
0e8b207e
AE		 4187 case L2CAP_CONF_PENDING:
4188 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4189
4190 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4191 char buf[64];
4192
4193 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4194 buf, &result);
0e8b207e 4195 if (len < 0) {
5e4e3972 4196 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4197 goto done;
4198 }
4199
f351bc72 4200 if (!chan->hs_hcon) {
79de886d
AE		 4201 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4202 0);
5ce66b59
AE		 4203 } else {
4204 if (l2cap_check_efs(chan)) {
4205 amp_create_logical_link(chan);
4206 chan->ident = cmd->ident;
4207 }
4208 }
0e8b207e
AE		 4209 }
4210 goto done;
4211
1da177e4 4212 case L2CAP_CONF_UNACCEPT:
73ffa904 4213 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4214 char req[64];
4215
c2c77ec8 4216 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4217 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4218 goto done;
4219 }
4220
f2fcfcd6
GP		 4221 /* throw out any old stored conf requests */
4222 result = L2CAP_CONF_SUCCESS;
b4450035 4223 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4224 req, &result);
f2fcfcd6 4225 if (len < 0) {
5e4e3972 4226 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4227 goto done;
4228 }
4229
4230 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4231 L2CAP_CONF_REQ, len, req);
73ffa904 4232 chan->num_conf_req++;
f2fcfcd6
GP		 4233 if (result != L2CAP_CONF_SUCCESS)
4234 goto done;
4235 break;
1da177e4
LT		 4236 }
4237
8e87d142 4238 default:
6be36555 4239 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4240
ba13ccd9 4241 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4242 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4243 goto done;
4244 }
4245
59e54bd1 4246 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4247 goto done;
4248
c1360a1c 4249 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4250
c1360a1c 4251 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4252 set_default_fcs(chan);
fcc203c3 4253
105bdf9e
MM		 4254 if (chan->mode == L2CAP_MODE_ERTM ||
4255 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4256 err = l2cap_ertm_init(chan);
0565c1c2 4257
3c588192 4258 if (err < 0)
5e4e3972 4259 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4260 else
4261 l2cap_chan_ready(chan);
1da177e4
LT		 4262 }
4263
4264done:
6be36555 4265 l2cap_chan_unlock(chan);
3c588192 4266 return err;
1da177e4
LT		 4267}
4268
2d792818 4269static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4270 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4271 u8 *data)
1da177e4
LT		 4272{
4273 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4274 struct l2cap_disconn_rsp rsp;
4275 u16 dcid, scid;
48454079 4276 struct l2cap_chan *chan;
1da177e4 4277
cb3b3152
JH		 4278 if (cmd_len != sizeof(*req))
4279 return -EPROTO;
4280
1da177e4
LT		 4281 scid = __le16_to_cpu(req->scid);
4282 dcid = __le16_to_cpu(req->dcid);
4283
4284 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4285
3df91ea2
AE		 4286 mutex_lock(&conn->chan_lock);
4287
4288 chan = __l2cap_get_chan_by_scid(conn, dcid);
4289 if (!chan) {
4290 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4291 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4292 return 0;
3df91ea2 4293 }
1da177e4 4294
6be36555
AE		 4295 l2cap_chan_lock(chan);
4296
fe4128e0
GP		 4297 rsp.dcid = cpu_to_le16(chan->scid);
4298 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4299 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4300
5ec1bbe5 4301 chan->ops->set_shutdown(chan);
1da177e4 4302
61d6ef3e 4303 l2cap_chan_hold(chan);
48454079 4304 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4305
4306 l2cap_chan_unlock(chan);
1da177e4 4307
80b98027 4308 chan->ops->close(chan);
61d6ef3e 4309 l2cap_chan_put(chan);
3df91ea2
AE		 4310
4311 mutex_unlock(&conn->chan_lock);
4312
1da177e4
LT		 4313 return 0;
4314}
4315
2d792818 4316static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4317 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4318 u8 *data)
1da177e4
LT		 4319{
4320 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4321 u16 dcid, scid;
48454079 4322 struct l2cap_chan *chan;
1da177e4 4323
cb3b3152
JH		 4324 if (cmd_len != sizeof(*rsp))
4325 return -EPROTO;
4326
1da177e4
LT		 4327 scid = __le16_to_cpu(rsp->scid);
4328 dcid = __le16_to_cpu(rsp->dcid);
4329
4330 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4331
3df91ea2
AE		 4332 mutex_lock(&conn->chan_lock);
4333
4334 chan = __l2cap_get_chan_by_scid(conn, scid);
4335 if (!chan) {
4336 mutex_unlock(&conn->chan_lock);
1da177e4 4337 return 0;
3df91ea2 4338 }
1da177e4 4339
6be36555 4340 l2cap_chan_lock(chan);
48454079 4341
61d6ef3e 4342 l2cap_chan_hold(chan);
48454079 4343 l2cap_chan_del(chan, 0);
6be36555
AE		 4344
4345 l2cap_chan_unlock(chan);
1da177e4 4346
80b98027 4347 chan->ops->close(chan);
61d6ef3e 4348 l2cap_chan_put(chan);
3df91ea2
AE		 4349
4350 mutex_unlock(&conn->chan_lock);
4351
1da177e4
LT		 4352 return 0;
4353}
4354
2d792818 4355static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4356 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4357 u8 *data)
1da177e4
LT		 4358{
4359 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4360 u16 type;
4361
cb3b3152
JH		 4362 if (cmd_len != sizeof(*req))
4363 return -EPROTO;
4364
1da177e4
LT		 4365 type = __le16_to_cpu(req->type);
4366
4367 BT_DBG("type 0x%4.4x", type);
4368
f0709e03
MH		 4369 if (type == L2CAP_IT_FEAT_MASK) {
4370 u8 buf[8];
44dd46de 4371 u32 feat_mask = l2cap_feat_mask;
f0709e03 4372 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
dcf4adbf
JP		 4373 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4374 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4375 if (!disable_ertm)
fcc203c3 4376 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4377 | L2CAP_FEAT_FCS;
848566b3 4378 if (conn->hs_enabled)
6327eb98 4379 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4380 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4381
1b7bf4ed 4382 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4383 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4384 buf);
e1027a7c
MH		 4385 } else if (type == L2CAP_IT_FIXED_CHAN) {
4386 u8 buf[12];
4387 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4388
848566b3 4389 if (conn->hs_enabled)
50a147cd
MM		 4390 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4391 else
4392 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4393
dcf4adbf
JP		 4394 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4395 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4396 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4397 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4398 buf);
f0709e03
MH		 4399 } else {
4400 struct l2cap_info_rsp rsp;
4401 rsp.type = cpu_to_le16(type);
dcf4adbf 4402 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4403 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4404 &rsp);
f0709e03 4405 }
1da177e4
LT		 4406
4407 return 0;
4408}
4409
2d792818 4410static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4411 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4412 u8 *data)
1da177e4
LT		 4413{
4414 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4415 u16 type, result;
4416
3f6fa3d4 4417 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4418 return -EPROTO;
4419
1da177e4
LT		 4420 type = __le16_to_cpu(rsp->type);
4421 result = __le16_to_cpu(rsp->result);
4422
4423 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4424
e90165be
AE		 4425 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4426 if (cmd->ident != conn->info_ident ||
2d792818 4427 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4428 return 0;
4429
17cd3f37 4430 cancel_delayed_work(&conn->info_timer);
4e8402a3 4431
adb08ede
VT		 4432 if (result != L2CAP_IR_SUCCESS) {
4433 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4434 conn->info_ident = 0;
4435
4436 l2cap_conn_start(conn);
4437
4438 return 0;
4439 }
4440
978c93b9
AE		 4441 switch (type) {
4442 case L2CAP_IT_FEAT_MASK:
83985319 4443 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4444
47ec1dcd 4445 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4446 struct l2cap_info_req req;
dcf4adbf 4447 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4448
4449 conn->info_ident = l2cap_get_ident(conn);
4450
4451 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4452 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4453 } else {
4454 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4455 conn->info_ident = 0;
4456
4457 l2cap_conn_start(conn);
4458 }
978c93b9
AE		 4459 break;
4460
4461 case L2CAP_IT_FIXED_CHAN:
4462 conn->fixed_chan_mask = rsp->data[0];
984947dc 4463 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4464 conn->info_ident = 0;
984947dc
MH		 4465
4466 l2cap_conn_start(conn);
978c93b9 4467 break;
984947dc 4468 }
4e8402a3 4469
1da177e4
LT		 4470 return 0;
4471}
4472
1700915f
MM		 4473static int l2cap_create_channel_req(struct l2cap_conn *conn,
4474 struct l2cap_cmd_hdr *cmd,
4475 u16 cmd_len, void *data)
f94ff6ff
MM		 4476{
4477 struct l2cap_create_chan_req *req = data;
6e1df6a6 4478 struct l2cap_create_chan_rsp rsp;
1700915f 4479 struct l2cap_chan *chan;
6e1df6a6 4480 struct hci_dev *hdev;
f94ff6ff
MM		 4481 u16 psm, scid;
4482
4483 if (cmd_len != sizeof(*req))
4484 return -EPROTO;
4485
848566b3 4486 if (!conn->hs_enabled)
f94ff6ff
MM		 4487 return -EINVAL;
4488
4489 psm = le16_to_cpu(req->psm);
4490 scid = le16_to_cpu(req->scid);
4491
ad0ac6ca 4492 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4493
6e1df6a6 4494 /* For controller id 0 make BR/EDR connection */
6ed971ca 4495 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4496 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4497 req->amp_id);
4498 return 0;
4499 }
1700915f 4500
6e1df6a6
AE		 4501 /* Validate AMP controller id */
4502 hdev = hci_dev_get(req->amp_id);
4503 if (!hdev)
4504 goto error;
1700915f 4505
6e1df6a6
AE		 4506 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4507 hci_dev_put(hdev);
4508 goto error;
4509 }
1700915f 4510
6e1df6a6
AE		 4511 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4512 req->amp_id);
4513 if (chan) {
4514 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4515 struct hci_conn *hs_hcon;
1700915f 4516
98e0f7ea
MH		 4517 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4518 &conn->hcon->dst);
6e1df6a6
AE		 4519 if (!hs_hcon) {
4520 hci_dev_put(hdev);
662d652d
JH		 4521 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4522 chan->dcid);
4523 return 0;
1700915f
MM		 4524 }
4525
6e1df6a6
AE		 4526 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4527
6e1df6a6
AE		 4528 mgr->bredr_chan = chan;
4529 chan->hs_hcon = hs_hcon;
fd45bf4c 4530 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4531 conn->mtu = hdev->block_mtu;
1700915f 4532 }
f94ff6ff 4533
6e1df6a6 4534 hci_dev_put(hdev);
f94ff6ff
MM		 4535
4536 return 0;
6e1df6a6
AE		 4537
4538error:
4539 rsp.dcid = 0;
4540 rsp.scid = cpu_to_le16(scid);
dcf4adbf
JP		 4541 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4542 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
6e1df6a6
AE		 4543
4544 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4545 sizeof(rsp), &rsp);
4546
dc280801 4547 return 0;
f94ff6ff
MM		 4548}
4549
8eb200bd
MM		 4550static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4551{
4552 struct l2cap_move_chan_req req;
4553 u8 ident;
4554
4555 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4556
4557 ident = l2cap_get_ident(chan->conn);
4558 chan->ident = ident;
4559
4560 req.icid = cpu_to_le16(chan->scid);
4561 req.dest_amp_id = dest_amp_id;
4562
4563 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4564 &req);
4565
4566 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4567}
4568
1500109b 4569static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4570{
4571 struct l2cap_move_chan_rsp rsp;
4572
1500109b 4573 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4574
1500109b 4575 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4576 rsp.result = cpu_to_le16(result);
4577
1500109b
MM		 4578 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4579 sizeof(rsp), &rsp);
8d5a04a1
MM		 4580}
4581
5b155ef9 4582static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4583{
4584 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4585
5b155ef9 4586 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4587
5b155ef9 4588 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4589
5b155ef9 4590 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4591 cfm.result = cpu_to_le16(result);
4592
5b155ef9
MM		 4593 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4594 sizeof(cfm), &cfm);
4595
4596 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4597}
4598
4599static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4600{
4601 struct l2cap_move_chan_cfm cfm;
4602
4603 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4604
4605 cfm.icid = cpu_to_le16(icid);
dcf4adbf 4606 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
5b155ef9
MM		 4607
4608 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4609 sizeof(cfm), &cfm);
8d5a04a1
MM		 4610}
4611
4612static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4613 u16 icid)
8d5a04a1
MM		 4614{
4615 struct l2cap_move_chan_cfm_rsp rsp;
4616
ad0ac6ca 4617 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4618
4619 rsp.icid = cpu_to_le16(icid);
4620 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4621}
4622
5f3847a4
MM		 4623static void __release_logical_link(struct l2cap_chan *chan)
4624{
4625 chan->hs_hchan = NULL;
4626 chan->hs_hcon = NULL;
4627
4628 /* Placeholder - release the logical link */
4629}
4630
1500109b
MM		 4631static void l2cap_logical_fail(struct l2cap_chan *chan)
4632{
4633 /* Logical link setup failed */
4634 if (chan->state != BT_CONNECTED) {
4635 /* Create channel failure, disconnect */
5e4e3972 4636 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4637 return;
4638 }
4639
4640 switch (chan->move_role) {
4641 case L2CAP_MOVE_ROLE_RESPONDER:
4642 l2cap_move_done(chan);
4643 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4644 break;
4645 case L2CAP_MOVE_ROLE_INITIATOR:
4646 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4647 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4648 /* Remote has only sent pending or
4649 * success responses, clean up
4650 */
4651 l2cap_move_done(chan);
4652 }
4653
4654 /* Other amp move states imply that the move
4655 * has already aborted
4656 */
4657 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4658 break;
4659 }
4660}
4661
4662static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4663 struct hci_chan *hchan)
4664{
4665 struct l2cap_conf_rsp rsp;
1500109b 4666
336178a3 4667 chan->hs_hchan = hchan;
1500109b
MM		 4668 chan->hs_hcon->l2cap_data = chan->conn;
4669
35ba9561 4670 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4671
4672 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4673 int err;
1500109b
MM		 4674
4675 set_default_fcs(chan);
4676
4677 err = l2cap_ertm_init(chan);
4678 if (err < 0)
5e4e3972 4679 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4680 else
4681 l2cap_chan_ready(chan);
4682 }
4683}
4684
4685static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4686 struct hci_chan *hchan)
4687{
4688 chan->hs_hcon = hchan->conn;
4689 chan->hs_hcon->l2cap_data = chan->conn;
4690
4691 BT_DBG("move_state %d", chan->move_state);
4692
4693 switch (chan->move_state) {
4694 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4695 /* Move confirm will be sent after a success
4696 * response is received
4697 */
4698 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4699 break;
4700 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4701 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4702 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4703 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4704 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4705 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4706 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4707 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4708 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4709 }
4710 break;
4711 default:
4712 /* Move was not in expected state, free the channel */
4713 __release_logical_link(chan);
4714
4715 chan->move_state = L2CAP_MOVE_STABLE;
4716 }
4717}
4718
4719/* Call with chan locked */
27695fb4
AE		 4720void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4721 u8 status)
5b155ef9 4722{
1500109b
MM		 4723 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4724
4725 if (status) {
4726 l2cap_logical_fail(chan);
4727 __release_logical_link(chan);
4728 return;
4729 }
4730
4731 if (chan->state != BT_CONNECTED) {
4732 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4733 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4734 l2cap_logical_finish_create(chan, hchan);
4735 } else {
4736 l2cap_logical_finish_move(chan, hchan);
4737 }
5b155ef9
MM		 4738}
4739
3f7a56c4
MM		 4740void l2cap_move_start(struct l2cap_chan *chan)
4741{
4742 BT_DBG("chan %p", chan);
4743
6ed971ca 4744 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4745 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4746 return;
4747 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4748 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4749 /* Placeholder - start physical link setup */
4750 } else {
4751 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4752 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4753 chan->move_id = 0;
4754 l2cap_move_setup(chan);
4755 l2cap_send_move_chan_req(chan, 0);
4756 }
4757}
4758
8eb200bd
MM		 4759static void l2cap_do_create(struct l2cap_chan *chan, int result,
4760 u8 local_amp_id, u8 remote_amp_id)
4761{
62748ca1
AE		 4762 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4763 local_amp_id, remote_amp_id);
4764
12d6cc60
AE		 4765 chan->fcs = L2CAP_FCS_NONE;
4766
62748ca1
AE		 4767 /* Outgoing channel on AMP */
4768 if (chan->state == BT_CONNECT) {
4769 if (result == L2CAP_CR_SUCCESS) {
4770 chan->local_amp_id = local_amp_id;
4771 l2cap_send_create_chan_req(chan, remote_amp_id);
4772 } else {
4773 /* Revert to BR/EDR connect */
4774 l2cap_send_conn_req(chan);
4775 }
4776
4777 return;
4778 }
4779
4780 /* Incoming channel on AMP */
4781 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4782 struct l2cap_conn_rsp rsp;
4783 char buf[128];
4784 rsp.scid = cpu_to_le16(chan->dcid);
4785 rsp.dcid = cpu_to_le16(chan->scid);
4786
8eb200bd
MM		 4787 if (result == L2CAP_CR_SUCCESS) {
4788 /* Send successful response */
dcf4adbf
JP		 4789 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4790 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4791 } else {
4792 /* Send negative response */
dcf4adbf
JP		 4793 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4794 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4795 }
4796
4797 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4798 sizeof(rsp), &rsp);
4799
4800 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4801 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4802 set_bit(CONF_REQ_SENT, &chan->conf_state);
4803 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4804 L2CAP_CONF_REQ,
4805 l2cap_build_conf_req(chan, buf), buf);
4806 chan->num_conf_req++;
4807 }
8eb200bd
MM		 4808 }
4809}
4810
4811static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4812 u8 remote_amp_id)
4813{
4814 l2cap_move_setup(chan);
4815 chan->move_id = local_amp_id;
4816 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4817
4818 l2cap_send_move_chan_req(chan, remote_amp_id);
4819}
4820
4821static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4822{
4823 struct hci_chan *hchan = NULL;
4824
4825 /* Placeholder - get hci_chan for logical link */
4826
4827 if (hchan) {
4828 if (hchan->state == BT_CONNECTED) {
4829 /* Logical link is ready to go */
4830 chan->hs_hcon = hchan->conn;
4831 chan->hs_hcon->l2cap_data = chan->conn;
4832 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4833 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4834
4835 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4836 } else {
4837 /* Wait for logical link to be ready */
4838 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4839 }
4840 } else {
4841 /* Logical link not available */
4842 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4843 }
4844}
4845
4846static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4847{
4848 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4849 u8 rsp_result;
4850 if (result == -EINVAL)
4851 rsp_result = L2CAP_MR_BAD_ID;
4852 else
4853 rsp_result = L2CAP_MR_NOT_ALLOWED;
4854
4855 l2cap_send_move_chan_rsp(chan, rsp_result);
4856 }
4857
4858 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4859 chan->move_state = L2CAP_MOVE_STABLE;
4860
4861 /* Restart data transmission */
4862 l2cap_ertm_send(chan);
4863}
4864
a514b17f
AE		 4865/* Invoke with locked chan */
4866void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4867{
770bfefa 4868 u8 local_amp_id = chan->local_amp_id;
fffadc08 4869 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4870
8eb200bd
MM		 4871 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4872 chan, result, local_amp_id, remote_amp_id);
4873
8eb200bd
MM		 4874 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4875 l2cap_chan_unlock(chan);
4876 return;
4877 }
4878
4879 if (chan->state != BT_CONNECTED) {
4880 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4881 } else if (result != L2CAP_MR_SUCCESS) {
4882 l2cap_do_move_cancel(chan, result);
4883 } else {
4884 switch (chan->move_role) {
4885 case L2CAP_MOVE_ROLE_INITIATOR:
4886 l2cap_do_move_initiate(chan, local_amp_id,
4887 remote_amp_id);
4888 break;
4889 case L2CAP_MOVE_ROLE_RESPONDER:
4890 l2cap_do_move_respond(chan, result);
4891 break;
4892 default:
4893 l2cap_do_move_cancel(chan, result);
4894 break;
4895 }
4896 }
8eb200bd
MM		 4897}
4898
8d5a04a1 4899static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4900 struct l2cap_cmd_hdr *cmd,
4901 u16 cmd_len, void *data)
8d5a04a1
MM		 4902{
4903 struct l2cap_move_chan_req *req = data;
1500109b 4904 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4905 struct l2cap_chan *chan;
8d5a04a1
MM		 4906 u16 icid = 0;
4907 u16 result = L2CAP_MR_NOT_ALLOWED;
4908
4909 if (cmd_len != sizeof(*req))
4910 return -EPROTO;
4911
4912 icid = le16_to_cpu(req->icid);
4913
ad0ac6ca 4914 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4915
848566b3 4916 if (!conn->hs_enabled)
8d5a04a1
MM		 4917 return -EINVAL;
4918
02b0fbb9
MM		 4919 chan = l2cap_get_chan_by_dcid(conn, icid);
4920 if (!chan) {
1500109b 4921 rsp.icid = cpu_to_le16(icid);
dcf4adbf 4922 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
1500109b
MM		 4923 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4924 sizeof(rsp), &rsp);
02b0fbb9
MM		 4925 return 0;
4926 }
4927
1500109b
MM		 4928 chan->ident = cmd->ident;
4929
02b0fbb9
MM		 4930 if (chan->scid < L2CAP_CID_DYN_START ||
4931 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4932 (chan->mode != L2CAP_MODE_ERTM &&
4933 chan->mode != L2CAP_MODE_STREAMING)) {
4934 result = L2CAP_MR_NOT_ALLOWED;
4935 goto send_move_response;
4936 }
4937
4938 if (chan->local_amp_id == req->dest_amp_id) {
4939 result = L2CAP_MR_SAME_ID;
4940 goto send_move_response;
4941 }
4942
6ed971ca 4943 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4944 struct hci_dev *hdev;
4945 hdev = hci_dev_get(req->dest_amp_id);
4946 if (!hdev || hdev->dev_type != HCI_AMP ||
4947 !test_bit(HCI_UP, &hdev->flags)) {
4948 if (hdev)
4949 hci_dev_put(hdev);
4950
4951 result = L2CAP_MR_BAD_ID;
4952 goto send_move_response;
4953 }
4954 hci_dev_put(hdev);
4955 }
4956
4957 /* Detect a move collision. Only send a collision response
4958 * if this side has "lost", otherwise proceed with the move.
4959 * The winner has the larger bd_addr.
4960 */
4961 if ((__chan_is_moving(chan) ||
4962 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4963 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4964 result = L2CAP_MR_COLLISION;
4965 goto send_move_response;
4966 }
4967
02b0fbb9
MM		 4968 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4969 l2cap_move_setup(chan);
4970 chan->move_id = req->dest_amp_id;
4971 icid = chan->dcid;
4972
6ed971ca 4973 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4974 /* Moving to BR/EDR */
4975 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4976 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4977 result = L2CAP_MR_PEND;
4978 } else {
4979 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4980 result = L2CAP_MR_SUCCESS;
4981 }
4982 } else {
4983 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4984 /* Placeholder - uncomment when amp functions are available */
4985 /*amp_accept_physical(chan, req->dest_amp_id);*/
4986 result = L2CAP_MR_PEND;
4987 }
4988
4989send_move_response:
1500109b 4990 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4991
02b0fbb9
MM		 4992 l2cap_chan_unlock(chan);
4993
8d5a04a1
MM		 4994 return 0;
4995}
4996
5b155ef9
MM		 4997static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4998{
4999 struct l2cap_chan *chan;
5000 struct hci_chan *hchan = NULL;
5001
5002 chan = l2cap_get_chan_by_scid(conn, icid);
5003 if (!chan) {
5004 l2cap_send_move_chan_cfm_icid(conn, icid);
5005 return;
5006 }
5007
5008 __clear_chan_timer(chan);
5009 if (result == L2CAP_MR_PEND)
5010 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
5011
5012 switch (chan->move_state) {
5013 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
5014 /* Move confirm will be sent when logical link
5015 * is complete.
5016 */
5017 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5018 break;
5019 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
5020 if (result == L2CAP_MR_PEND) {
5021 break;
5022 } else if (test_bit(CONN_LOCAL_BUSY,
5023 &chan->conn_state)) {
5024 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
5025 } else {
5026 /* Logical link is up or moving to BR/EDR,
5027 * proceed with move
5028 */
5029 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
5030 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5031 }
5032 break;
5033 case L2CAP_MOVE_WAIT_RSP:
5034 /* Moving to AMP */
5035 if (result == L2CAP_MR_SUCCESS) {
5036 /* Remote is ready, send confirm immediately
5037 * after logical link is ready
5038 */
5039 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5040 } else {
5041 /* Both logical link and move success
5042 * are required to confirm
5043 */
5044 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5045 }
5046
5047 /* Placeholder - get hci_chan for logical link */
5048 if (!hchan) {
5049 /* Logical link not available */
5050 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5051 break;
5052 }
5053
5054 /* If the logical link is not yet connected, do not
5055 * send confirmation.
5056 */
5057 if (hchan->state != BT_CONNECTED)
5058 break;
5059
5060 /* Logical link is already ready to go */
5061
5062 chan->hs_hcon = hchan->conn;
5063 chan->hs_hcon->l2cap_data = chan->conn;
5064
5065 if (result == L2CAP_MR_SUCCESS) {
5066 /* Can confirm now */
5067 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5068 } else {
5069 /* Now only need move success
5070 * to confirm
5071 */
5072 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5073 }
5074
5075 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5076 break;
5077 default:
5078 /* Any other amp move state means the move failed. */
5079 chan->move_id = chan->local_amp_id;
5080 l2cap_move_done(chan);
5081 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5082 }
5083
5084 l2cap_chan_unlock(chan);
5085}
5086
5087static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5088 u16 result)
5089{
5090 struct l2cap_chan *chan;
5091
5092 chan = l2cap_get_chan_by_ident(conn, ident);
5093 if (!chan) {
5094 /* Could not locate channel, icid is best guess */
5095 l2cap_send_move_chan_cfm_icid(conn, icid);
5096 return;
5097 }
5098
5099 __clear_chan_timer(chan);
5100
5101 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5102 if (result == L2CAP_MR_COLLISION) {
5103 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5104 } else {
5105 /* Cleanup - cancel move */
5106 chan->move_id = chan->local_amp_id;
5107 l2cap_move_done(chan);
5108 }
5109 }
5110
5111 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5112
5113 l2cap_chan_unlock(chan);
5114}
5115
5116static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5117 struct l2cap_cmd_hdr *cmd,
5118 u16 cmd_len, void *data)
8d5a04a1
MM		 5119{
5120 struct l2cap_move_chan_rsp *rsp = data;
5121 u16 icid, result;
5122
5123 if (cmd_len != sizeof(*rsp))
5124 return -EPROTO;
5125
5126 icid = le16_to_cpu(rsp->icid);
5127 result = le16_to_cpu(rsp->result);
5128
ad0ac6ca 5129 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5130
5b155ef9
MM		 5131 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5132 l2cap_move_continue(conn, icid, result);
5133 else
5134 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5135
5136 return 0;
5137}
5138
5f3847a4
MM		 5139static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5140 struct l2cap_cmd_hdr *cmd,
5141 u16 cmd_len, void *data)
8d5a04a1
MM		 5142{
5143 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5144 struct l2cap_chan *chan;
8d5a04a1
MM		 5145 u16 icid, result;
5146
5147 if (cmd_len != sizeof(*cfm))
5148 return -EPROTO;
5149
5150 icid = le16_to_cpu(cfm->icid);
5151 result = le16_to_cpu(cfm->result);
5152
ad0ac6ca 5153 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5154
5f3847a4
MM		 5155 chan = l2cap_get_chan_by_dcid(conn, icid);
5156 if (!chan) {
5157 /* Spec requires a response even if the icid was not found */
5158 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5159 return 0;
5160 }
5161
5162 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5163 if (result == L2CAP_MC_CONFIRMED) {
5164 chan->local_amp_id = chan->move_id;
6ed971ca 5165 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5166 __release_logical_link(chan);
5167 } else {
5168 chan->move_id = chan->local_amp_id;
5169 }
5170
5171 l2cap_move_done(chan);
5172 }
5173
8d5a04a1
MM		 5174 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5175
5f3847a4
MM		 5176 l2cap_chan_unlock(chan);
5177
8d5a04a1
MM		 5178 return 0;
5179}
5180
5181static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5182 struct l2cap_cmd_hdr *cmd,
5183 u16 cmd_len, void *data)
8d5a04a1
MM		 5184{
5185 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5186 struct l2cap_chan *chan;
8d5a04a1
MM		 5187 u16 icid;
5188
5189 if (cmd_len != sizeof(*rsp))
5190 return -EPROTO;
5191
5192 icid = le16_to_cpu(rsp->icid);
5193
ad0ac6ca 5194 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5195
3fd71a0a
MM		 5196 chan = l2cap_get_chan_by_scid(conn, icid);
5197 if (!chan)
5198 return 0;
5199
5200 __clear_chan_timer(chan);
5201
5202 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5203 chan->local_amp_id = chan->move_id;
5204
6ed971ca 5205 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5206 __release_logical_link(chan);
5207
5208 l2cap_move_done(chan);
5209 }
5210
5211 l2cap_chan_unlock(chan);
5212
8d5a04a1
MM		 5213 return 0;
5214}
5215
de73115a 5216static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5217 struct l2cap_cmd_hdr *cmd,
203e639e 5218 u16 cmd_len, u8 *data)
de73115a
CT		 5219{
5220 struct hci_conn *hcon = conn->hcon;
5221 struct l2cap_conn_param_update_req *req;
5222 struct l2cap_conn_param_update_rsp rsp;
203e639e 5223 u16 min, max, latency, to_multiplier;
2ce603eb 5224 int err;
de73115a 5225
4dae2798 5226 if (!test_bit(HCI_CONN_MASTER, &hcon->flags))
de73115a
CT		 5227 return -EINVAL;
5228
de73115a
CT		 5229 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5230 return -EPROTO;
5231
5232 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5233 min = __le16_to_cpu(req->min);
5234 max = __le16_to_cpu(req->max);
de73115a
CT		 5235 latency = __le16_to_cpu(req->latency);
5236 to_multiplier = __le16_to_cpu(req->to_multiplier);
5237
5238 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5239 min, max, latency, to_multiplier);
de73115a
CT		 5240
5241 memset(&rsp, 0, sizeof(rsp));
2ce603eb 5242
d4905f24 5243 err = hci_check_conn_params(min, max, latency, to_multiplier);
2ce603eb 5244 if (err)
dcf4adbf 5245 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5246 else
dcf4adbf 5247 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5248
5249 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5250 sizeof(rsp), &rsp);
de73115a 5251
ffb5a827
AG		 5252 if (!err) {
5253 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
5254 min, max, latency, to_multiplier);
5255
2ce603eb 5256 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
ffb5a827 5257 }
2ce603eb 5258
de73115a
CT		 5259 return 0;
5260}
5261
f1496dee
JH		 5262static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5263 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5264 u8 *data)
5265{
5266 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5267 u16 dcid, mtu, mps, credits, result;
5268 struct l2cap_chan *chan;
5269 int err;
5270
5271 if (cmd_len < sizeof(*rsp))
5272 return -EPROTO;
5273
5274 dcid = __le16_to_cpu(rsp->dcid);
5275 mtu = __le16_to_cpu(rsp->mtu);
5276 mps = __le16_to_cpu(rsp->mps);
5277 credits = __le16_to_cpu(rsp->credits);
5278 result = __le16_to_cpu(rsp->result);
5279
5280 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5281 return -EPROTO;
5282
5283 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5284 dcid, mtu, mps, credits, result);
5285
5286 mutex_lock(&conn->chan_lock);
5287
5288 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5289 if (!chan) {
5290 err = -EBADSLT;
5291 goto unlock;
5292 }
5293
5294 err = 0;
5295
5296 l2cap_chan_lock(chan);
5297
5298 switch (result) {
5299 case L2CAP_CR_SUCCESS:
5300 chan->ident = 0;
5301 chan->dcid = dcid;
5302 chan->omtu = mtu;
5303 chan->remote_mps = mps;
0cd75f7e 5304 chan->tx_credits = credits;
f1496dee
JH		 5305 l2cap_chan_ready(chan);
5306 break;
5307
5308 default:
5309 l2cap_chan_del(chan, ECONNREFUSED);
5310 break;
5311 }
5312
5313 l2cap_chan_unlock(chan);
5314
5315unlock:
5316 mutex_unlock(&conn->chan_lock);
5317
5318 return err;
5319}
5320
3300d9a9 5321static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5322 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5323 u8 *data)
3300d9a9
CT		 5324{
5325 int err = 0;
5326
5327 switch (cmd->code) {
5328 case L2CAP_COMMAND_REJ:
cb3b3152 5329 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5330 break;
5331
5332 case L2CAP_CONN_REQ:
cb3b3152 5333 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5334 break;
5335
5336 case L2CAP_CONN_RSP:
f5a2598d 5337 case L2CAP_CREATE_CHAN_RSP:
9245e737 5338 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5339 break;
5340
5341 case L2CAP_CONF_REQ:
5342 err = l2cap_config_req(conn, cmd, cmd_len, data);
5343 break;
5344
5345 case L2CAP_CONF_RSP:
9245e737 5346 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5347 break;
5348
5349 case L2CAP_DISCONN_REQ:
cb3b3152 5350 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5351 break;
5352
5353 case L2CAP_DISCONN_RSP:
9245e737 5354 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5355 break;
5356
5357 case L2CAP_ECHO_REQ:
5358 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5359 break;
5360
5361 case L2CAP_ECHO_RSP:
5362 break;
5363
5364 case L2CAP_INFO_REQ:
cb3b3152 5365 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5366 break;
5367
5368 case L2CAP_INFO_RSP:
9245e737 5369 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5370 break;
5371
f94ff6ff
MM		 5372 case L2CAP_CREATE_CHAN_REQ:
5373 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5374 break;
5375
8d5a04a1
MM		 5376 case L2CAP_MOVE_CHAN_REQ:
5377 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5378 break;
5379
5380 case L2CAP_MOVE_CHAN_RSP:
9245e737 5381 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5382 break;
5383
5384 case L2CAP_MOVE_CHAN_CFM:
5385 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5386 break;
5387
5388 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5389 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5390 break;
5391
3300d9a9
CT		 5392 default:
5393 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5394 err = -EINVAL;
5395 break;
5396 }
5397
5398 return err;
5399}
5400
27e2d4c8
JH		 5401static int l2cap_le_connect_req(struct l2cap_conn *conn,
5402 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5403 u8 *data)
5404{
5405 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5406 struct l2cap_le_conn_rsp rsp;
5407 struct l2cap_chan *chan, *pchan;
0cd75f7e 5408 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5409 __le16 psm;
5410 u8 result;
5411
5412 if (cmd_len != sizeof(*req))
5413 return -EPROTO;
5414
5415 scid = __le16_to_cpu(req->scid);
5416 mtu = __le16_to_cpu(req->mtu);
5417 mps = __le16_to_cpu(req->mps);
5418 psm = req->psm;
5419 dcid = 0;
0cd75f7e 5420 credits = 0;
27e2d4c8
JH		 5421
5422 if (mtu < 23 || mps < 23)
5423 return -EPROTO;
5424
5425 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5426 scid, mtu, mps);
5427
5428 /* Check if we have socket listening on psm */
5429 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5430 &conn->hcon->dst, LE_LINK);
5431 if (!pchan) {
5432 result = L2CAP_CR_BAD_PSM;
5433 chan = NULL;
5434 goto response;
5435 }
5436
5437 mutex_lock(&conn->chan_lock);
5438 l2cap_chan_lock(pchan);
5439
5440 if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
5441 result = L2CAP_CR_AUTHENTICATION;
5442 chan = NULL;
5443 goto response_unlock;
5444 }
5445
5446 /* Check if we already have channel with that dcid */
5447 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5448 result = L2CAP_CR_NO_MEM;
5449 chan = NULL;
5450 goto response_unlock;
5451 }
5452
5453 chan = pchan->ops->new_connection(pchan);
5454 if (!chan) {
5455 result = L2CAP_CR_NO_MEM;
5456 goto response_unlock;
5457 }
5458
0ce43ce6
JH		 5459 l2cap_le_flowctl_init(chan);
5460
27e2d4c8
JH		 5461 bacpy(&chan->src, &conn->hcon->src);
5462 bacpy(&chan->dst, &conn->hcon->dst);
5463 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
5464 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
5465 chan->psm = psm;
5466 chan->dcid = scid;
5467 chan->omtu = mtu;
5468 chan->remote_mps = mps;
0cd75f7e 5469 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5470
5471 __l2cap_chan_add(conn, chan);
5472 dcid = chan->scid;
0cd75f7e 5473 credits = chan->rx_credits;
27e2d4c8
JH		 5474
5475 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5476
5477 chan->ident = cmd->ident;
5478
5479 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5480 l2cap_state_change(chan, BT_CONNECT2);
5481 result = L2CAP_CR_PEND;
5482 chan->ops->defer(chan);
5483 } else {
5484 l2cap_chan_ready(chan);
5485 result = L2CAP_CR_SUCCESS;
5486 }
5487
5488response_unlock:
5489 l2cap_chan_unlock(pchan);
5490 mutex_unlock(&conn->chan_lock);
5491
5492 if (result == L2CAP_CR_PEND)
5493 return 0;
5494
5495response:
5496 if (chan) {
5497 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5498 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5499 } else {
5500 rsp.mtu = 0;
5501 rsp.mps = 0;
5502 }
5503
5504 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5505 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5506 rsp.result = cpu_to_le16(result);
5507
5508 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5509
5510 return 0;
5511}
5512
fad5fc89
JH		 5513static inline int l2cap_le_credits(struct l2cap_conn *conn,
5514 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5515 u8 *data)
5516{
5517 struct l2cap_le_credits *pkt;
5518 struct l2cap_chan *chan;
0f1bfe4e 5519 u16 cid, credits, max_credits;
fad5fc89
JH		 5520
5521 if (cmd_len != sizeof(*pkt))
5522 return -EPROTO;
5523
5524 pkt = (struct l2cap_le_credits *) data;
5525 cid = __le16_to_cpu(pkt->cid);
5526 credits = __le16_to_cpu(pkt->credits);
5527
5528 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5529
5530 chan = l2cap_get_chan_by_dcid(conn, cid);
5531 if (!chan)
5532 return -EBADSLT;
5533
0f1bfe4e
JH		 5534 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5535 if (credits > max_credits) {
5536 BT_ERR("LE credits overflow");
5537 l2cap_send_disconn_req(chan, ECONNRESET);
5538
5539 /* Return 0 so that we don't trigger an unnecessary
5540 * command reject packet.
5541 */
5542 return 0;
5543 }
5544
fad5fc89
JH		 5545 chan->tx_credits += credits;
5546
5547 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5548 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5549 chan->tx_credits--;
5550 }
5551
5552 if (chan->tx_credits)
5553 chan->ops->resume(chan);
5554
5555 l2cap_chan_unlock(chan);
5556
5557 return 0;
5558}
5559
71fb4197
JH		 5560static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5561 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5562 u8 *data)
5563{
5564 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5565 struct l2cap_chan *chan;
5566
5567 if (cmd_len < sizeof(*rej))
5568 return -EPROTO;
5569
5570 mutex_lock(&conn->chan_lock);
5571
5572 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5573 if (!chan)
5574 goto done;
5575
5576 l2cap_chan_lock(chan);
5577 l2cap_chan_del(chan, ECONNREFUSED);
5578 l2cap_chan_unlock(chan);
5579
5580done:
5581 mutex_unlock(&conn->chan_lock);
5582 return 0;
5583}
5584
3300d9a9 5585static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5586 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5587 u8 *data)
3300d9a9 5588{
b5ecba64
JH		 5589 int err = 0;
5590
3300d9a9
CT		 5591 switch (cmd->code) {
5592 case L2CAP_COMMAND_REJ:
71fb4197 5593 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5594 break;
3300d9a9
CT		 5595
5596 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5597 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5598 break;
3300d9a9
CT		 5599
5600 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5601 break;
3300d9a9 5602
f1496dee
JH		 5603 case L2CAP_LE_CONN_RSP:
5604 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5605 break;
f1496dee 5606
27e2d4c8 5607 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5608 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5609 break;
27e2d4c8 5610
fad5fc89
JH		 5611 case L2CAP_LE_CREDITS:
5612 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5613 break;
5614
3defe01a 5615 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5616 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5617 break;
3defe01a
JH		 5618
5619 case L2CAP_DISCONN_RSP:
5620 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5621 break;
3defe01a 5622
3300d9a9
CT		 5623 default:
5624 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5625 err = -EINVAL;
5626 break;
3300d9a9 5627 }
b5ecba64
JH		 5628
5629 return err;
3300d9a9
CT		 5630}
5631
c5623556
JH		 5632static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5633 struct sk_buff *skb)
5634{
69c4e4e8 5635 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5636 struct l2cap_cmd_hdr *cmd;
5637 u16 len;
c5623556
JH		 5638 int err;
5639
69c4e4e8 5640 if (hcon->type != LE_LINK)
3b166295 5641 goto drop;
69c4e4e8 5642
4f3e219d
MH		 5643 if (skb->len < L2CAP_CMD_HDR_SIZE)
5644 goto drop;
c5623556 5645
4f3e219d
MH		 5646 cmd = (void *) skb->data;
5647 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5648
4f3e219d 5649 len = le16_to_cpu(cmd->len);
c5623556 5650
4f3e219d 5651 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5652
4f3e219d
MH		 5653 if (len != skb->len || !cmd->ident) {
5654 BT_DBG("corrupted command");
5655 goto drop;
5656 }
c5623556 5657
203e639e 5658 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5659 if (err) {
5660 struct l2cap_cmd_rej_unk rej;
c5623556 5661
4f3e219d 5662 BT_ERR("Wrong link type (%d)", err);
c5623556 5663
dcf4adbf 5664 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5665 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5666 sizeof(rej), &rej);
c5623556
JH		 5667 }
5668
3b166295 5669drop:
c5623556
JH		 5670 kfree_skb(skb);
5671}
5672
3300d9a9 5673static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5674 struct sk_buff *skb)
1da177e4 5675{
69c4e4e8 5676 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5677 u8 *data = skb->data;
5678 int len = skb->len;
5679 struct l2cap_cmd_hdr cmd;
3300d9a9 5680 int err;
1da177e4
LT		 5681
5682 l2cap_raw_recv(conn, skb);
5683
69c4e4e8 5684 if (hcon->type != ACL_LINK)
3b166295 5685 goto drop;
69c4e4e8 5686
1da177e4 5687 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5688 u16 cmd_len;
1da177e4
LT		 5689 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5690 data += L2CAP_CMD_HDR_SIZE;
5691 len -= L2CAP_CMD_HDR_SIZE;
5692
88219a0f 5693 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5694
2d792818
GP		 5695 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5696 cmd.ident);
1da177e4 5697
88219a0f 5698 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5699 BT_DBG("corrupted command");
5700 break;
5701 }
5702
c5623556 5703 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5704 if (err) {
e2fd318e 5705 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5706
5707 BT_ERR("Wrong link type (%d)", err);
1da177e4 5708
dcf4adbf 5709 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5710 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5711 sizeof(rej), &rej);
1da177e4
LT		 5712 }
5713
88219a0f
AV		 5714 data += cmd_len;
5715 len -= cmd_len;
1da177e4
LT		 5716 }
5717
3b166295 5718drop:
1da177e4
LT		 5719 kfree_skb(skb);
5720}
5721
47d1ec61 5722static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5723{
5724 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5725 int hdr_size;
5726
5727 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5728 hdr_size = L2CAP_EXT_HDR_SIZE;
5729 else
5730 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5731
47d1ec61 5732 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5733 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5734 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5735 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5736
5737 if (our_fcs != rcv_fcs)
7a560e5c 5738 return -EBADMSG;
fcc203c3
GP		 5739 }
5740 return 0;
5741}
5742
6ea00485 5743static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5744{
e31f7633 5745 struct l2cap_ctrl control;
d5392c8f 5746
e31f7633 5747 BT_DBG("chan %p", chan);
d5392c8f 5748
e31f7633
MM		 5749 memset(&control, 0, sizeof(control));
5750 control.sframe = 1;
5751 control.final = 1;
5752 control.reqseq = chan->buffer_seq;
5753 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5754
e2ab4353 5755 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5756 control.super = L2CAP_SUPER_RNR;
5757 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5758 }
5759
e31f7633
MM		 5760 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5761 chan->unacked_frames > 0)
5762 __set_retrans_timer(chan);
d5392c8f 5763
e31f7633 5764 /* Send pending iframes */
525cd185 5765 l2cap_ertm_send(chan);
d5392c8f 5766
e2ab4353 5767 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5768 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5769 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5770 * send it now.
5771 */
5772 control.super = L2CAP_SUPER_RR;
5773 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5774 }
5775}
5776
2d792818
GP		 5777static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5778 struct sk_buff **last_frag)
18778a63 5779{
84084a31
MM		 5780 /* skb->len reflects data in skb as well as all fragments
5781 * skb->data_len reflects only data in fragments
5782 */
5783 if (!skb_has_frag_list(skb))
5784 skb_shinfo(skb)->frag_list = new_frag;
5785
5786 new_frag->next = NULL;
5787
5788 (*last_frag)->next = new_frag;
5789 *last_frag = new_frag;
5790
5791 skb->len += new_frag->len;
5792 skb->data_len += new_frag->len;
5793 skb->truesize += new_frag->truesize;
5794}
5795
4b51dae9
MM		 5796static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5797 struct l2cap_ctrl *control)
84084a31
MM		 5798{
5799 int err = -EINVAL;
18778a63 5800
4b51dae9 5801 switch (control->sar) {
7e0ef6ee 5802 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5803 if (chan->sdu)
5804 break;
18778a63 5805
80b98027 5806 err = chan->ops->recv(chan, skb);
84084a31 5807 break;
18778a63 5808
7e0ef6ee 5809 case L2CAP_SAR_START:
84084a31
MM		 5810 if (chan->sdu)
5811 break;
18778a63 5812
6f61fd47 5813 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5814 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5815
84084a31
MM		 5816 if (chan->sdu_len > chan->imtu) {
5817 err = -EMSGSIZE;
5818 break;
5819 }
1890d36b 5820
84084a31
MM		 5821 if (skb->len >= chan->sdu_len)
5822 break;
18778a63 5823
84084a31
MM		 5824 chan->sdu = skb;
5825 chan->sdu_last_frag = skb;
18778a63 5826
84084a31
MM		 5827 skb = NULL;
5828 err = 0;
18778a63
GP		 5829 break;
5830
7e0ef6ee 5831 case L2CAP_SAR_CONTINUE:
6f61fd47 5832 if (!chan->sdu)
84084a31 5833 break;
18778a63 5834
84084a31
MM		 5835 append_skb_frag(chan->sdu, skb,
5836 &chan->sdu_last_frag);
5837 skb = NULL;
18778a63 5838
84084a31
MM		 5839 if (chan->sdu->len >= chan->sdu_len)
5840 break;
4178ba46 5841
84084a31 5842 err = 0;
18778a63
GP		 5843 break;
5844
7e0ef6ee 5845 case L2CAP_SAR_END:
6f61fd47 5846 if (!chan->sdu)
84084a31 5847 break;
18778a63 5848
84084a31
MM		 5849 append_skb_frag(chan->sdu, skb,
5850 &chan->sdu_last_frag);
5851 skb = NULL;
4178ba46 5852
84084a31
MM		 5853 if (chan->sdu->len != chan->sdu_len)
5854 break;
18778a63 5855
80b98027 5856 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5857
84084a31
MM		 5858 if (!err) {
5859 /* Reassembly complete */
5860 chan->sdu = NULL;
5861 chan->sdu_last_frag = NULL;
5862 chan->sdu_len = 0;
1890d36b 5863 }
18778a63
GP		 5864 break;
5865 }
5866
84084a31
MM		 5867 if (err) {
5868 kfree_skb(skb);
5869 kfree_skb(chan->sdu);
5870 chan->sdu = NULL;
5871 chan->sdu_last_frag = NULL;
5872 chan->sdu_len = 0;
5873 }
18778a63 5874
84084a31 5875 return err;
18778a63
GP		 5876}
5877
32b32735
MM		 5878static int l2cap_resegment(struct l2cap_chan *chan)
5879{
5880 /* Placeholder */
5881 return 0;
5882}
5883
61aa4f5b 5884void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5885{
61aa4f5b 5886 u8 event;
712132eb 5887
61aa4f5b
MM		 5888 if (chan->mode != L2CAP_MODE_ERTM)
5889 return;
712132eb 5890
61aa4f5b 5891 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5892 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5893}
5894
d2a7ac5d
MM		 5895static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5896{
63838725
MM		 5897 int err = 0;
5898 /* Pass sequential frames to l2cap_reassemble_sdu()
5899 * until a gap is encountered.
5900 */
5901
5902 BT_DBG("chan %p", chan);
5903
5904 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5905 struct sk_buff *skb;
5906 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5907 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5908
5909 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5910
5911 if (!skb)
5912 break;
5913
5914 skb_unlink(skb, &chan->srej_q);
5915 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5916 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5917 if (err)
5918 break;
5919 }
5920
5921 if (skb_queue_empty(&chan->srej_q)) {
5922 chan->rx_state = L2CAP_RX_STATE_RECV;
5923 l2cap_send_ack(chan);
5924 }
5925
5926 return err;
d2a7ac5d
MM		 5927}
5928
5929static void l2cap_handle_srej(struct l2cap_chan *chan,
5930 struct l2cap_ctrl *control)
5931{
f80842a8
MM		 5932 struct sk_buff *skb;
5933
5934 BT_DBG("chan %p, control %p", chan, control);
5935
5936 if (control->reqseq == chan->next_tx_seq) {
5937 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5938 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5939 return;
5940 }
5941
5942 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5943
5944 if (skb == NULL) {
5945 BT_DBG("Seq %d not available for retransmission",
5946 control->reqseq);
5947 return;
5948 }
5949
5950 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5951 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5952 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5953 return;
5954 }
5955
5956 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5957
5958 if (control->poll) {
5959 l2cap_pass_to_tx(chan, control);
5960
5961 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5962 l2cap_retransmit(chan, control);
5963 l2cap_ertm_send(chan);
5964
5965 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5966 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5967 chan->srej_save_reqseq = control->reqseq;
5968 }
5969 } else {
5970 l2cap_pass_to_tx_fbit(chan, control);
5971
5972 if (control->final) {
5973 if (chan->srej_save_reqseq != control->reqseq ||
5974 !test_and_clear_bit(CONN_SREJ_ACT,
5975 &chan->conn_state))
5976 l2cap_retransmit(chan, control);
5977 } else {
5978 l2cap_retransmit(chan, control);
5979 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5980 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5981 chan->srej_save_reqseq = control->reqseq;
5982 }
5983 }
5984 }
d2a7ac5d
MM		 5985}
5986
5987static void l2cap_handle_rej(struct l2cap_chan *chan,
5988 struct l2cap_ctrl *control)
5989{
fcd289df
MM		 5990 struct sk_buff *skb;
5991
5992 BT_DBG("chan %p, control %p", chan, control);
5993
5994 if (control->reqseq == chan->next_tx_seq) {
5995 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5996 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5997 return;
5998 }
5999
6000 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
6001
6002 if (chan->max_tx && skb &&
6003 bt_cb(skb)->control.retries >= chan->max_tx) {
6004 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 6005 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6006 return;
6007 }
6008
6009 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6010
6011 l2cap_pass_to_tx(chan, control);
6012
6013 if (control->final) {
6014 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6015 l2cap_retransmit_all(chan, control);
6016 } else {
6017 l2cap_retransmit_all(chan, control);
6018 l2cap_ertm_send(chan);
6019 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6020 set_bit(CONN_REJ_ACT, &chan->conn_state);
6021 }
d2a7ac5d
MM		 6022}
6023
4b51dae9
MM		 6024static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6025{
6026 BT_DBG("chan %p, txseq %d", chan, txseq);
6027
6028 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6029 chan->expected_tx_seq);
6030
6031 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6032 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 6033 chan->tx_win) {
4b51dae9
MM		 6034 /* See notes below regarding "double poll" and
6035 * invalid packets.
6036 */
6037 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6038 BT_DBG("Invalid/Ignore - after SREJ");
6039 return L2CAP_TXSEQ_INVALID_IGNORE;
6040 } else {
6041 BT_DBG("Invalid - in window after SREJ sent");
6042 return L2CAP_TXSEQ_INVALID;
6043 }
6044 }
6045
6046 if (chan->srej_list.head == txseq) {
6047 BT_DBG("Expected SREJ");
6048 return L2CAP_TXSEQ_EXPECTED_SREJ;
6049 }
6050
6051 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6052 BT_DBG("Duplicate SREJ - txseq already stored");
6053 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6054 }
6055
6056 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6057 BT_DBG("Unexpected SREJ - not requested");
6058 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6059 }
6060 }
6061
6062 if (chan->expected_tx_seq == txseq) {
6063 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6064 chan->tx_win) {
6065 BT_DBG("Invalid - txseq outside tx window");
6066 return L2CAP_TXSEQ_INVALID;
6067 } else {
6068 BT_DBG("Expected");
6069 return L2CAP_TXSEQ_EXPECTED;
6070 }
6071 }
6072
6073 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6074 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6075 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6076 return L2CAP_TXSEQ_DUPLICATE;
6077 }
6078
6079 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6080 /* A source of invalid packets is a "double poll" condition,
6081 * where delays cause us to send multiple poll packets. If
6082 * the remote stack receives and processes both polls,
6083 * sequence numbers can wrap around in such a way that a
6084 * resent frame has a sequence number that looks like new data
6085 * with a sequence gap. This would trigger an erroneous SREJ
6086 * request.
6087 *
6088 * Fortunately, this is impossible with a tx window that's
6089 * less than half of the maximum sequence number, which allows
6090 * invalid frames to be safely ignored.
6091 *
6092 * With tx window sizes greater than half of the tx window
6093 * maximum, the frame is invalid and cannot be ignored. This
6094 * causes a disconnect.
6095 */
6096
6097 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6098 BT_DBG("Invalid/Ignore - txseq outside tx window");
6099 return L2CAP_TXSEQ_INVALID_IGNORE;
6100 } else {
6101 BT_DBG("Invalid - txseq outside tx window");
6102 return L2CAP_TXSEQ_INVALID;
6103 }
6104 } else {
6105 BT_DBG("Unexpected - txseq indicates missing frames");
6106 return L2CAP_TXSEQ_UNEXPECTED;
6107 }
6108}
6109
d2a7ac5d
MM		 6110static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6111 struct l2cap_ctrl *control,
6112 struct sk_buff *skb, u8 event)
6113{
6114 int err = 0;
941247f9 6115 bool skb_in_use = false;
d2a7ac5d
MM		 6116
6117 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6118 event);
6119
6120 switch (event) {
6121 case L2CAP_EV_RECV_IFRAME:
6122 switch (l2cap_classify_txseq(chan, control->txseq)) {
6123 case L2CAP_TXSEQ_EXPECTED:
6124 l2cap_pass_to_tx(chan, control);
6125
6126 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6127 BT_DBG("Busy, discarding expected seq %d",
6128 control->txseq);
6129 break;
6130 }
6131
6132 chan->expected_tx_seq = __next_seq(chan,
6133 control->txseq);
6134
6135 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6136 skb_in_use = true;
d2a7ac5d
MM		 6137
6138 err = l2cap_reassemble_sdu(chan, skb, control);
6139 if (err)
6140 break;
6141
6142 if (control->final) {
6143 if (!test_and_clear_bit(CONN_REJ_ACT,
6144 &chan->conn_state)) {
6145 control->final = 0;
6146 l2cap_retransmit_all(chan, control);
6147 l2cap_ertm_send(chan);
6148 }
6149 }
6150
6151 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6152 l2cap_send_ack(chan);
6153 break;
6154 case L2CAP_TXSEQ_UNEXPECTED:
6155 l2cap_pass_to_tx(chan, control);
6156
6157 /* Can't issue SREJ frames in the local busy state.
6158 * Drop this frame, it will be seen as missing
6159 * when local busy is exited.
6160 */
6161 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6162 BT_DBG("Busy, discarding unexpected seq %d",
6163 control->txseq);
6164 break;
6165 }
6166
6167 /* There was a gap in the sequence, so an SREJ
6168 * must be sent for each missing frame. The
6169 * current frame is stored for later use.
6170 */
6171 skb_queue_tail(&chan->srej_q, skb);
941247f9 6172 skb_in_use = true;
d2a7ac5d
MM		 6173 BT_DBG("Queued %p (queue len %d)", skb,
6174 skb_queue_len(&chan->srej_q));
6175
6176 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6177 l2cap_seq_list_clear(&chan->srej_list);
6178 l2cap_send_srej(chan, control->txseq);
6179
6180 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6181 break;
6182 case L2CAP_TXSEQ_DUPLICATE:
6183 l2cap_pass_to_tx(chan, control);
6184 break;
6185 case L2CAP_TXSEQ_INVALID_IGNORE:
6186 break;
6187 case L2CAP_TXSEQ_INVALID:
6188 default:
5e4e3972 6189 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6190 break;
6191 }
6192 break;
6193 case L2CAP_EV_RECV_RR:
6194 l2cap_pass_to_tx(chan, control);
6195 if (control->final) {
6196 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6197
e6a3ee6e
MM		 6198 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6199 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6200 control->final = 0;
6201 l2cap_retransmit_all(chan, control);
6202 }
6203
6204 l2cap_ertm_send(chan);
6205 } else if (control->poll) {
6206 l2cap_send_i_or_rr_or_rnr(chan);
6207 } else {
6208 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6209 &chan->conn_state) &&
6210 chan->unacked_frames)
6211 __set_retrans_timer(chan);
6212
6213 l2cap_ertm_send(chan);
6214 }
6215 break;
6216 case L2CAP_EV_RECV_RNR:
6217 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6218 l2cap_pass_to_tx(chan, control);
6219 if (control && control->poll) {
6220 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6221 l2cap_send_rr_or_rnr(chan, 0);
6222 }
6223 __clear_retrans_timer(chan);
6224 l2cap_seq_list_clear(&chan->retrans_list);
6225 break;
6226 case L2CAP_EV_RECV_REJ:
6227 l2cap_handle_rej(chan, control);
6228 break;
6229 case L2CAP_EV_RECV_SREJ:
6230 l2cap_handle_srej(chan, control);
6231 break;
6232 default:
6233 break;
6234 }
6235
6236 if (skb && !skb_in_use) {
6237 BT_DBG("Freeing %p", skb);
6238 kfree_skb(skb);
6239 }
6240
6241 return err;
6242}
6243
6244static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6245 struct l2cap_ctrl *control,
6246 struct sk_buff *skb, u8 event)
6247{
6248 int err = 0;
6249 u16 txseq = control->txseq;
941247f9 6250 bool skb_in_use = false;
d2a7ac5d
MM		 6251
6252 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6253 event);
6254
6255 switch (event) {
6256 case L2CAP_EV_RECV_IFRAME:
6257 switch (l2cap_classify_txseq(chan, txseq)) {
6258 case L2CAP_TXSEQ_EXPECTED:
6259 /* Keep frame for reassembly later */
6260 l2cap_pass_to_tx(chan, control);
6261 skb_queue_tail(&chan->srej_q, skb);
941247f9 6262 skb_in_use = true;
d2a7ac5d
MM		 6263 BT_DBG("Queued %p (queue len %d)", skb,
6264 skb_queue_len(&chan->srej_q));
6265
6266 chan->expected_tx_seq = __next_seq(chan, txseq);
6267 break;
6268 case L2CAP_TXSEQ_EXPECTED_SREJ:
6269 l2cap_seq_list_pop(&chan->srej_list);
6270
6271 l2cap_pass_to_tx(chan, control);
6272 skb_queue_tail(&chan->srej_q, skb);
941247f9 6273 skb_in_use = true;
d2a7ac5d
MM		 6274 BT_DBG("Queued %p (queue len %d)", skb,
6275 skb_queue_len(&chan->srej_q));
6276
6277 err = l2cap_rx_queued_iframes(chan);
6278 if (err)
6279 break;
6280
6281 break;
6282 case L2CAP_TXSEQ_UNEXPECTED:
6283 /* Got a frame that can't be reassembled yet.
6284 * Save it for later, and send SREJs to cover
6285 * the missing frames.
6286 */
6287 skb_queue_tail(&chan->srej_q, skb);
941247f9 6288 skb_in_use = true;
d2a7ac5d
MM		 6289 BT_DBG("Queued %p (queue len %d)", skb,
6290 skb_queue_len(&chan->srej_q));
6291
6292 l2cap_pass_to_tx(chan, control);
6293 l2cap_send_srej(chan, control->txseq);
6294 break;
6295 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6296 /* This frame was requested with an SREJ, but
6297 * some expected retransmitted frames are
6298 * missing. Request retransmission of missing
6299 * SREJ'd frames.
6300 */
6301 skb_queue_tail(&chan->srej_q, skb);
941247f9 6302 skb_in_use = true;
d2a7ac5d
MM		 6303 BT_DBG("Queued %p (queue len %d)", skb,
6304 skb_queue_len(&chan->srej_q));
6305
6306 l2cap_pass_to_tx(chan, control);
6307 l2cap_send_srej_list(chan, control->txseq);
6308 break;
6309 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6310 /* We've already queued this frame. Drop this copy. */
6311 l2cap_pass_to_tx(chan, control);
6312 break;
6313 case L2CAP_TXSEQ_DUPLICATE:
6314 /* Expecting a later sequence number, so this frame
6315 * was already received. Ignore it completely.
6316 */
6317 break;
6318 case L2CAP_TXSEQ_INVALID_IGNORE:
6319 break;
6320 case L2CAP_TXSEQ_INVALID:
6321 default:
5e4e3972 6322 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6323 break;
6324 }
6325 break;
6326 case L2CAP_EV_RECV_RR:
6327 l2cap_pass_to_tx(chan, control);
6328 if (control->final) {
6329 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6330
6331 if (!test_and_clear_bit(CONN_REJ_ACT,
6332 &chan->conn_state)) {
6333 control->final = 0;
6334 l2cap_retransmit_all(chan, control);
6335 }
6336
6337 l2cap_ertm_send(chan);
6338 } else if (control->poll) {
6339 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6340 &chan->conn_state) &&
6341 chan->unacked_frames) {
6342 __set_retrans_timer(chan);
6343 }
6344
6345 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6346 l2cap_send_srej_tail(chan);
6347 } else {
6348 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6349 &chan->conn_state) &&
6350 chan->unacked_frames)
6351 __set_retrans_timer(chan);
6352
6353 l2cap_send_ack(chan);
6354 }
6355 break;
6356 case L2CAP_EV_RECV_RNR:
6357 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6358 l2cap_pass_to_tx(chan, control);
6359 if (control->poll) {
6360 l2cap_send_srej_tail(chan);
6361 } else {
6362 struct l2cap_ctrl rr_control;
6363 memset(&rr_control, 0, sizeof(rr_control));
6364 rr_control.sframe = 1;
6365 rr_control.super = L2CAP_SUPER_RR;
6366 rr_control.reqseq = chan->buffer_seq;
6367 l2cap_send_sframe(chan, &rr_control);
6368 }
6369
6370 break;
6371 case L2CAP_EV_RECV_REJ:
6372 l2cap_handle_rej(chan, control);
6373 break;
6374 case L2CAP_EV_RECV_SREJ:
6375 l2cap_handle_srej(chan, control);
6376 break;
6377 }
6378
6379 if (skb && !skb_in_use) {
6380 BT_DBG("Freeing %p", skb);
6381 kfree_skb(skb);
6382 }
6383
6384 return err;
6385}
6386
32b32735
MM		 6387static int l2cap_finish_move(struct l2cap_chan *chan)
6388{
6389 BT_DBG("chan %p", chan);
6390
6391 chan->rx_state = L2CAP_RX_STATE_RECV;
6392
6393 if (chan->hs_hcon)
6394 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6395 else
6396 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6397
6398 return l2cap_resegment(chan);
6399}
6400
6401static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6402 struct l2cap_ctrl *control,
6403 struct sk_buff *skb, u8 event)
6404{
6405 int err;
6406
6407 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6408 event);
6409
6410 if (!control->poll)
6411 return -EPROTO;
6412
6413 l2cap_process_reqseq(chan, control->reqseq);
6414
6415 if (!skb_queue_empty(&chan->tx_q))
6416 chan->tx_send_head = skb_peek(&chan->tx_q);
6417 else
6418 chan->tx_send_head = NULL;
6419
6420 /* Rewind next_tx_seq to the point expected
6421 * by the receiver.
6422 */
6423 chan->next_tx_seq = control->reqseq;
6424 chan->unacked_frames = 0;
6425
6426 err = l2cap_finish_move(chan);
6427 if (err)
6428 return err;
6429
6430 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6431 l2cap_send_i_or_rr_or_rnr(chan);
6432
6433 if (event == L2CAP_EV_RECV_IFRAME)
6434 return -EPROTO;
6435
6436 return l2cap_rx_state_recv(chan, control, NULL, event);
6437}
6438
6439static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6440 struct l2cap_ctrl *control,
6441 struct sk_buff *skb, u8 event)
6442{
6443 int err;
6444
6445 if (!control->final)
6446 return -EPROTO;
6447
6448 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6449
6450 chan->rx_state = L2CAP_RX_STATE_RECV;
6451 l2cap_process_reqseq(chan, control->reqseq);
6452
6453 if (!skb_queue_empty(&chan->tx_q))
6454 chan->tx_send_head = skb_peek(&chan->tx_q);
6455 else
6456 chan->tx_send_head = NULL;
6457
6458 /* Rewind next_tx_seq to the point expected
6459 * by the receiver.
6460 */
6461 chan->next_tx_seq = control->reqseq;
6462 chan->unacked_frames = 0;
6463
6464 if (chan->hs_hcon)
6465 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6466 else
6467 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6468
6469 err = l2cap_resegment(chan);
6470
6471 if (!err)
6472 err = l2cap_rx_state_recv(chan, control, skb, event);
6473
6474 return err;
6475}
6476
d2a7ac5d
MM		 6477static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6478{
6479 /* Make sure reqseq is for a packet that has been sent but not acked */
6480 u16 unacked;
6481
6482 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6483 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6484}
6485
cec8ab6e
MM		 6486static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6487 struct sk_buff *skb, u8 event)
218bb9df 6488{
d2a7ac5d
MM		 6489 int err = 0;
6490
6491 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6492 control, skb, event, chan->rx_state);
6493
6494 if (__valid_reqseq(chan, control->reqseq)) {
6495 switch (chan->rx_state) {
6496 case L2CAP_RX_STATE_RECV:
6497 err = l2cap_rx_state_recv(chan, control, skb, event);
6498 break;
6499 case L2CAP_RX_STATE_SREJ_SENT:
6500 err = l2cap_rx_state_srej_sent(chan, control, skb,
6501 event);
6502 break;
32b32735
MM		 6503 case L2CAP_RX_STATE_WAIT_P:
6504 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6505 break;
6506 case L2CAP_RX_STATE_WAIT_F:
6507 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6508 break;
d2a7ac5d
MM		 6509 default:
6510 /* shut it down */
6511 break;
6512 }
6513 } else {
6514 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6515 control->reqseq, chan->next_tx_seq,
6516 chan->expected_ack_seq);
5e4e3972 6517 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6518 }
6519
6520 return err;
cec8ab6e
MM		 6521}
6522
6523static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6524 struct sk_buff *skb)
6525{
4b51dae9
MM		 6526 int err = 0;
6527
6528 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6529 chan->rx_state);
6530
6531 if (l2cap_classify_txseq(chan, control->txseq) ==
6532 L2CAP_TXSEQ_EXPECTED) {
6533 l2cap_pass_to_tx(chan, control);
6534
6535 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6536 __next_seq(chan, chan->buffer_seq));
6537
6538 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6539
6540 l2cap_reassemble_sdu(chan, skb, control);
6541 } else {
6542 if (chan->sdu) {
6543 kfree_skb(chan->sdu);
6544 chan->sdu = NULL;
6545 }
6546 chan->sdu_last_frag = NULL;
6547 chan->sdu_len = 0;
6548
6549 if (skb) {
6550 BT_DBG("Freeing %p", skb);
6551 kfree_skb(skb);
6552 }
6553 }
6554
6555 chan->last_acked_seq = control->txseq;
6556 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6557
6558 return err;
cec8ab6e
MM		 6559}
6560
6561static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6562{
6563 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6564 u16 len;
6565 u8 event;
218bb9df 6566
b76bbd66
MM		 6567 __unpack_control(chan, skb);
6568
218bb9df
GP		 6569 len = skb->len;
6570
6571 /*
6572 * We can just drop the corrupted I-frame here.
6573 * Receiver will miss it and start proper recovery
cec8ab6e 6574 * procedures and ask for retransmission.
218bb9df 6575 */
47d1ec61 6576 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6577 goto drop;
6578
cec8ab6e 6579 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6580 len -= L2CAP_SDULEN_SIZE;
218bb9df 6581
47d1ec61 6582 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6583 len -= L2CAP_FCS_SIZE;
218bb9df 6584
47d1ec61 6585 if (len > chan->mps) {
5e4e3972 6586 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6587 goto drop;
6588 }
6589
cec8ab6e
MM		 6590 if (!control->sframe) {
6591 int err;
218bb9df 6592
cec8ab6e
MM		 6593 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6594 control->sar, control->reqseq, control->final,
6595 control->txseq);
218bb9df 6596
cec8ab6e
MM		 6597 /* Validate F-bit - F=0 always valid, F=1 only
6598 * valid in TX WAIT_F
6599 */
6600 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6601 goto drop;
cec8ab6e
MM		 6602
6603 if (chan->mode != L2CAP_MODE_STREAMING) {
6604 event = L2CAP_EV_RECV_IFRAME;
6605 err = l2cap_rx(chan, control, skb, event);
6606 } else {
6607 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6608 }
6609
cec8ab6e 6610 if (err)
5e4e3972 6611 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6612 } else {
cec8ab6e
MM		 6613 const u8 rx_func_to_event[4] = {
6614 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6615 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6616 };
6617
6618 /* Only I-frames are expected in streaming mode */
6619 if (chan->mode == L2CAP_MODE_STREAMING)
6620 goto drop;
6621
6622 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6623 control->reqseq, control->final, control->poll,
6624 control->super);
6625
218bb9df 6626 if (len != 0) {
1bb166e6 6627 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6628 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6629 goto drop;
6630 }
6631
cec8ab6e
MM		 6632 /* Validate F and P bits */
6633 if (control->final && (control->poll ||
6634 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6635 goto drop;
6636
6637 event = rx_func_to_event[control->super];
6638 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6639 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6640 }
6641
6642 return 0;
6643
6644drop:
6645 kfree_skb(skb);
6646 return 0;
6647}
6648
b1c325c2
JH		 6649static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6650{
6651 struct l2cap_conn *conn = chan->conn;
6652 struct l2cap_le_credits pkt;
6653 u16 return_credits;
6654
6655 /* We return more credits to the sender only after the amount of
6656 * credits falls below half of the initial amount.
6657 */
f15b8ecf 6658 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6659 return;
6660
f15b8ecf 6661 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6662
6663 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6664
6665 chan->rx_credits += return_credits;
6666
6667 pkt.cid = cpu_to_le16(chan->scid);
6668 pkt.credits = cpu_to_le16(return_credits);
6669
6670 chan->ident = l2cap_get_ident(conn);
6671
6672 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6673}
6674
fad5fc89
JH		 6675static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6676{
aac23bf6
JH		 6677 int err;
6678
6679 if (!chan->rx_credits) {
6680 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6681 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6682 return -ENOBUFS;
aac23bf6 6683 }
fad5fc89 6684
aac23bf6
JH		 6685 if (chan->imtu < skb->len) {
6686 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6687 return -ENOBUFS;
aac23bf6 6688 }
fad5fc89
JH		 6689
6690 chan->rx_credits--;
6691 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6692
6693 l2cap_chan_le_send_credits(chan);
6694
aac23bf6
JH		 6695 err = 0;
6696
6697 if (!chan->sdu) {
6698 u16 sdu_len;
6699
6700 sdu_len = get_unaligned_le16(skb->data);
6701 skb_pull(skb, L2CAP_SDULEN_SIZE);
6702
6703 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6704 sdu_len, skb->len, chan->imtu);
6705
6706 if (sdu_len > chan->imtu) {
6707 BT_ERR("Too big LE L2CAP SDU length received");
6708 err = -EMSGSIZE;
6709 goto failed;
6710 }
6711
6712 if (skb->len > sdu_len) {
6713 BT_ERR("Too much LE L2CAP data received");
6714 err = -EINVAL;
6715 goto failed;
6716 }
6717
6718 if (skb->len == sdu_len)
6719 return chan->ops->recv(chan, skb);
6720
6721 chan->sdu = skb;
6722 chan->sdu_len = sdu_len;
6723 chan->sdu_last_frag = skb;
6724
6725 return 0;
6726 }
6727
6728 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6729 chan->sdu->len, skb->len, chan->sdu_len);
6730
6731 if (chan->sdu->len + skb->len > chan->sdu_len) {
6732 BT_ERR("Too much LE L2CAP data received");
6733 err = -EINVAL;
6734 goto failed;
6735 }
6736
6737 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6738 skb = NULL;
6739
6740 if (chan->sdu->len == chan->sdu_len) {
6741 err = chan->ops->recv(chan, chan->sdu);
6742 if (!err) {
6743 chan->sdu = NULL;
6744 chan->sdu_last_frag = NULL;
6745 chan->sdu_len = 0;
6746 }
6747 }
6748
6749failed:
6750 if (err) {
6751 kfree_skb(skb);
6752 kfree_skb(chan->sdu);
6753 chan->sdu = NULL;
6754 chan->sdu_last_frag = NULL;
6755 chan->sdu_len = 0;
6756 }
6757
6758 /* We can't return an error here since we took care of the skb
6759 * freeing internally. An error return would cause the caller to
6760 * do a double-free of the skb.
6761 */
6762 return 0;
fad5fc89
JH		 6763}
6764
13ca56e0
AE		 6765static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6766 struct sk_buff *skb)
1da177e4 6767{
48454079 6768 struct l2cap_chan *chan;
1da177e4 6769
baa7e1fa 6770 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6771 if (!chan) {
97e8e89d
AE		 6772 if (cid == L2CAP_CID_A2MP) {
6773 chan = a2mp_channel_create(conn, skb);
6774 if (!chan) {
6775 kfree_skb(skb);
13ca56e0 6776 return;
97e8e89d
AE		 6777 }
6778
6779 l2cap_chan_lock(chan);
6780 } else {
6781 BT_DBG("unknown cid 0x%4.4x", cid);
6782 /* Drop packet and return */
6783 kfree_skb(skb);
13ca56e0 6784 return;
97e8e89d 6785 }
1da177e4
LT		 6786 }
6787
49208c9c 6788 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6789
89bc500e 6790 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6791 goto drop;
6792
0c1bc5c6 6793 switch (chan->mode) {
38319713 6794 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6795 if (l2cap_le_data_rcv(chan, skb) < 0)
6796 goto drop;
6797
6798 goto done;
6799
1c2acffb
GP		 6800 case L2CAP_MODE_BASIC:
6801 /* If socket recv buffers overflows we drop data here
6802 * which is *bad* because L2CAP has to be reliable.
6803 * But we don't have any other choice. L2CAP doesn't
6804 * provide flow control mechanism. */
1da177e4 6805
2c96e03d
SJ		 6806 if (chan->imtu < skb->len) {
6807 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6808 goto drop;
2c96e03d 6809 }
1da177e4 6810
80b98027 6811 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6812 goto done;
6813 break;
6814
6815 case L2CAP_MODE_ERTM:
6840ed07 6816 case L2CAP_MODE_STREAMING:
cec8ab6e 6817 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6818 goto done;
6819
1c2acffb 6820 default:
0c1bc5c6 6821 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6822 break;
6823 }
1da177e4
LT		 6824
6825drop:
6826 kfree_skb(skb);
6827
6828done:
6be36555 6829 l2cap_chan_unlock(chan);
1da177e4
LT		 6830}
6831
84104b24
AE		 6832static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6833 struct sk_buff *skb)
1da177e4 6834{
ae4fd2d3 6835 struct hci_conn *hcon = conn->hcon;
23691d75 6836 struct l2cap_chan *chan;
1da177e4 6837
ae4fd2d3
MH		 6838 if (hcon->type != ACL_LINK)
6839 goto drop;
6840
bf20fd4e
JH		 6841 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6842 ACL_LINK);
23691d75 6843 if (!chan)
1da177e4
LT		 6844 goto drop;
6845
5b4cedaa 6846 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6847
89bc500e 6848 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6849 goto drop;
6850
e13e21dc 6851 if (chan->imtu < skb->len)
1da177e4
LT		 6852 goto drop;
6853
2edf870d 6854 /* Store remote BD_ADDR and PSM for msg_name */
06ae3314 6855 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
2edf870d
MH		 6856 bt_cb(skb)->psm = psm;
6857
80b98027 6858 if (!chan->ops->recv(chan, skb))
84104b24 6859 return;
1da177e4
LT		 6860
6861drop:
6862 kfree_skb(skb);
1da177e4
LT		 6863}
6864
72f78356 6865static void l2cap_att_channel(struct l2cap_conn *conn,
6810fca7 6866 struct sk_buff *skb)
9f69bda6 6867{
b99707d7 6868 struct hci_conn *hcon = conn->hcon;
23691d75 6869 struct l2cap_chan *chan;
9f69bda6 6870
b99707d7
MH		 6871 if (hcon->type != LE_LINK)
6872 goto drop;
6873
af1c0134 6874 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
06ae3314 6875 &hcon->src, &hcon->dst);
23691d75 6876 if (!chan)
9f69bda6
GP		 6877 goto drop;
6878
5b4cedaa 6879 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6880
cc8dba2b
MH		 6881 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type))
6882 goto drop;
6883
e13e21dc 6884 if (chan->imtu < skb->len)
9f69bda6
GP		 6885 goto drop;
6886
80b98027 6887 if (!chan->ops->recv(chan, skb))
6810fca7 6888 return;
9f69bda6
GP		 6889
6890drop:
6891 kfree_skb(skb);
9f69bda6
GP		 6892}
6893
1da177e4
LT		 6894static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6895{
6896 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6897 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6898 u16 cid, len;
6899 __le16 psm;
1da177e4 6900
61a939c6
JH		 6901 if (hcon->state != BT_CONNECTED) {
6902 BT_DBG("queueing pending rx skb");
6903 skb_queue_tail(&conn->pending_rx, skb);
6904 return;
6905 }
6906
1da177e4
LT		 6907 skb_pull(skb, L2CAP_HDR_SIZE);
6908 cid = __le16_to_cpu(lh->cid);
6909 len = __le16_to_cpu(lh->len);
6910
1c2acffb
GP		 6911 if (len != skb->len) {
6912 kfree_skb(skb);
6913 return;
6914 }
6915
1da177e4
LT		 6916 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6917
6918 switch (cid) {
8db4dc46 6919 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6920 l2cap_sig_channel(conn, skb);
6921 break;
6922
8db4dc46 6923 case L2CAP_CID_CONN_LESS:
097db76c 6924 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6925 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6926 l2cap_conless_channel(conn, psm, skb);
6927 break;
6928
073d1cf3 6929 case L2CAP_CID_ATT:
72f78356 6930 l2cap_att_channel(conn, skb);
9f69bda6
GP		 6931 break;
6932
a2877629
MH		 6933 case L2CAP_CID_LE_SIGNALING:
6934 l2cap_le_sig_channel(conn, skb);
6935 break;
6936
b501d6a1
AB		 6937 case L2CAP_CID_SMP:
6938 if (smp_sig_channel(conn, skb))
6939 l2cap_conn_del(conn->hcon, EACCES);
6940 break;
6941
1da177e4
LT		 6942 default:
6943 l2cap_data_channel(conn, cid, skb);
6944 break;
6945 }
6946}
6947
61a939c6
JH		 6948static void process_pending_rx(struct work_struct *work)
6949{
6950 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6951 pending_rx_work);
6952 struct sk_buff *skb;
6953
6954 BT_DBG("");
6955
6956 while ((skb = skb_dequeue(&conn->pending_rx)))
6957 l2cap_recv_frame(conn, skb);
6958}
6959
162b49e7
JH		 6960static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6961{
6962 struct l2cap_conn *conn = hcon->l2cap_data;
6963 struct hci_chan *hchan;
6964
6965 if (conn)
6966 return conn;
6967
6968 hchan = hci_chan_create(hcon);
6969 if (!hchan)
6970 return NULL;
6971
6972 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
6973 if (!conn) {
6974 hci_chan_del(hchan);
6975 return NULL;
6976 }
6977
6978 kref_init(&conn->ref);
6979 hcon->l2cap_data = conn;
6980 conn->hcon = hcon;
6981 hci_conn_get(conn->hcon);
6982 conn->hchan = hchan;
6983
6984 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6985
6986 switch (hcon->type) {
6987 case LE_LINK:
6988 if (hcon->hdev->le_mtu) {
6989 conn->mtu = hcon->hdev->le_mtu;
6990 break;
6991 }
6992 /* fall through */
6993 default:
6994 conn->mtu = hcon->hdev->acl_mtu;
6995 break;
6996 }
6997
6998 conn->feat_mask = 0;
6999
7000 if (hcon->type == ACL_LINK)
7001 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
7002 &hcon->hdev->dev_flags);
7003
7004 spin_lock_init(&conn->lock);
7005 mutex_init(&conn->chan_lock);
7006
7007 INIT_LIST_HEAD(&conn->chan_l);
7008 INIT_LIST_HEAD(&conn->users);
7009
7010 if (hcon->type == LE_LINK)
7011 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
7012 else
7013 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
7014
61a939c6
JH		 7015 skb_queue_head_init(&conn->pending_rx);
7016 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
7017
162b49e7
JH		 7018 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
7019
7020 return conn;
7021}
7022
7023static bool is_valid_psm(u16 psm, u8 dst_type) {
7024 if (!psm)
7025 return false;
7026
7027 if (bdaddr_type_is_le(dst_type))
7028 return (psm <= 0x00ff);
7029
7030 /* PSM must be odd and lsb of upper byte must be 0 */
7031 return ((psm & 0x0101) == 0x0001);
7032}
7033
7034int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
7035 bdaddr_t *dst, u8 dst_type)
7036{
7037 struct l2cap_conn *conn;
7038 struct hci_conn *hcon;
7039 struct hci_dev *hdev;
7040 __u8 auth_type;
7041 int err;
7042
7043 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7044 dst_type, __le16_to_cpu(psm));
7045
7046 hdev = hci_get_route(dst, &chan->src);
7047 if (!hdev)
7048 return -EHOSTUNREACH;
7049
7050 hci_dev_lock(hdev);
7051
7052 l2cap_chan_lock(chan);
7053
7054 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7055 chan->chan_type != L2CAP_CHAN_RAW) {
7056 err = -EINVAL;
7057 goto done;
7058 }
7059
21626e62
JH		 7060 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7061 err = -EINVAL;
7062 goto done;
7063 }
7064
7065 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 7066 err = -EINVAL;
7067 goto done;
7068 }
7069
7070 switch (chan->mode) {
7071 case L2CAP_MODE_BASIC:
7072 break;
7073 case L2CAP_MODE_LE_FLOWCTL:
7074 l2cap_le_flowctl_init(chan);
7075 break;
7076 case L2CAP_MODE_ERTM:
7077 case L2CAP_MODE_STREAMING:
7078 if (!disable_ertm)
7079 break;
7080 /* fall through */
7081 default:
7082 err = -ENOTSUPP;
7083 goto done;
7084 }
7085
7086 switch (chan->state) {
7087 case BT_CONNECT:
7088 case BT_CONNECT2:
7089 case BT_CONFIG:
7090 /* Already connecting */
7091 err = 0;
7092 goto done;
7093
7094 case BT_CONNECTED:
7095 /* Already connected */
7096 err = -EISCONN;
7097 goto done;
7098
7099 case BT_OPEN:
7100 case BT_BOUND:
7101 /* Can connect */
7102 break;
7103
7104 default:
7105 err = -EBADFD;
7106 goto done;
7107 }
7108
7109 /* Set destination address and psm */
7110 bacpy(&chan->dst, dst);
7111 chan->dst_type = dst_type;
7112
7113 chan->psm = psm;
7114 chan->dcid = cid;
7115
7116 auth_type = l2cap_get_auth_type(chan);
7117
6f77d8c7
AG		 7118 if (bdaddr_type_is_le(dst_type)) {
7119 /* Convert from L2CAP channel address type to HCI address type
7120 */
7121 if (dst_type == BDADDR_LE_PUBLIC)
7122 dst_type = ADDR_LE_DEV_PUBLIC;
7123 else
7124 dst_type = ADDR_LE_DEV_RANDOM;
7125
04a6c589
AG		 7126 hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level,
7127 auth_type);
6f77d8c7 7128 } else {
04a6c589 7129 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7130 }
162b49e7
JH		 7131
7132 if (IS_ERR(hcon)) {
7133 err = PTR_ERR(hcon);
7134 goto done;
7135 }
7136
7137 conn = l2cap_conn_add(hcon);
7138 if (!conn) {
7139 hci_conn_drop(hcon);
7140 err = -ENOMEM;
7141 goto done;
7142 }
7143
7144 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7145 hci_conn_drop(hcon);
7146 err = -EBUSY;
7147 goto done;
7148 }
7149
7150 /* Update source addr of the socket */
7151 bacpy(&chan->src, &hcon->src);
7152 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7153
7154 l2cap_chan_unlock(chan);
7155 l2cap_chan_add(conn, chan);
7156 l2cap_chan_lock(chan);
7157
7158 /* l2cap_chan_add takes its own ref so we can drop this one */
7159 hci_conn_drop(hcon);
7160
7161 l2cap_state_change(chan, BT_CONNECT);
7162 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7163
61202e4d
JH		 7164 /* Release chan->sport so that it can be reused by other
7165 * sockets (as it's only used for listening sockets).
7166 */
7167 write_lock(&chan_list_lock);
7168 chan->sport = 0;
7169 write_unlock(&chan_list_lock);
7170
162b49e7
JH		 7171 if (hcon->state == BT_CONNECTED) {
7172 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7173 __clear_chan_timer(chan);
7174 if (l2cap_chan_check_security(chan))
7175 l2cap_state_change(chan, BT_CONNECTED);
7176 } else
7177 l2cap_do_start(chan);
7178 }
7179
7180 err = 0;
7181
7182done:
7183 l2cap_chan_unlock(chan);
7184 hci_dev_unlock(hdev);
7185 hci_dev_put(hdev);
7186 return err;
7187}
6b8d4a6a 7188EXPORT_SYMBOL_GPL(l2cap_chan_connect);
162b49e7 7189
1da177e4
LT		 7190/* ---- L2CAP interface with lower layer (HCI) ---- */
7191
686ebf28 7192int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7193{
7194 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7195 struct l2cap_chan *c;
1da177e4 7196
6ed93dc6 7197 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7198
7199 /* Find listening sockets and check their link_mode */
23691d75
GP		 7200 read_lock(&chan_list_lock);
7201 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7202 if (c->state != BT_LISTEN)
1da177e4
LT		 7203 continue;
7204
7eafc59e 7205 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7206 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7207 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7208 lm1 |= HCI_LM_MASTER;
1da177e4 7209 exact++;
7eafc59e 7210 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7211 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7212 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7213 lm2 |= HCI_LM_MASTER;
7214 }
1da177e4 7215 }
23691d75 7216 read_unlock(&chan_list_lock);
1da177e4
LT		 7217
7218 return exact ? lm1 : lm2;
7219}
7220
9e664631 7221void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7222{
0139418c
MH		 7223 struct l2cap_conn *conn;
7224
6ed93dc6 7225 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7226
1da177e4 7227 if (!status) {
baf43251 7228 conn = l2cap_conn_add(hcon);
1da177e4
LT		 7229 if (conn)
7230 l2cap_conn_ready(conn);
ba6fc317 7231 } else {
e175072f 7232 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 7233 }
1da177e4
LT		 7234}
7235
686ebf28 7236int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7237{
7238 struct l2cap_conn *conn = hcon->l2cap_data;
7239
7240 BT_DBG("hcon %p", hcon);
7241
686ebf28 7242 if (!conn)
9f5a0d7b 7243 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7244 return conn->disc_reason;
7245}
7246
9e664631 7247void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 7248{
7249 BT_DBG("hcon %p reason %d", hcon, reason);
7250
e175072f 7251 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7252}
7253
4343478f 7254static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7255{
715ec005 7256 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7257 return;
7258
f62e4323 7259 if (encrypt == 0x00) {
4343478f 7260 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7261 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7262 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7263 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7264 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7265 } else {
4343478f 7266 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7267 __clear_chan_timer(chan);
f62e4323
MH		 7268 }
7269}
7270
686ebf28 7271int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7272{
0139418c 7273 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7274 struct l2cap_chan *chan;
1da177e4 7275
0139418c 7276 if (!conn)
1da177e4 7277 return 0;
0139418c 7278
89d8b407 7279 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7280
160dc6ac 7281 if (hcon->type == LE_LINK) {
35d4adcc 7282 if (!status && encrypt)
4bd6d38e 7283 smp_distribute_keys(conn);
17cd3f37 7284 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 7285 }
7286
3df91ea2 7287 mutex_lock(&conn->chan_lock);
1da177e4 7288
3df91ea2 7289 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7290 l2cap_chan_lock(chan);
1da177e4 7291
89d8b407
AE		 7292 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7293 state_to_string(chan->state));
f1cb9af5 7294
2338a7e0 7295 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7296 l2cap_chan_unlock(chan);
7297 continue;
7298 }
7299
073d1cf3 7300 if (chan->scid == L2CAP_CID_ATT) {
f1cb9af5
VCG		 7301 if (!status && encrypt) {
7302 chan->sec_level = hcon->sec_level;
cf4cd009 7303 l2cap_chan_ready(chan);
f1cb9af5
VCG		 7304 }
7305
6be36555 7306 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 7307 continue;
7308 }
7309
96eff46e 7310 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7311 l2cap_chan_unlock(chan);
6a8d3010
MH		 7312 continue;
7313 }
7314
89bc500e 7315 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7316 chan->state == BT_CONFIG)) {
d97c899b 7317 chan->ops->resume(chan);
4343478f 7318 l2cap_check_encryption(chan, encrypt);
6be36555 7319 l2cap_chan_unlock(chan);
9719f8af
MH		 7320 continue;
7321 }
7322
89bc500e 7323 if (chan->state == BT_CONNECT) {
6d3c15da 7324 if (!status)
93c3e8f5 7325 l2cap_start_connection(chan);
6d3c15da 7326 else
ba13ccd9 7327 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
89bc500e 7328 } else if (chan->state == BT_CONNECT2) {
b1235d79 7329 struct l2cap_conn_rsp rsp;
df3c3931 7330 __u16 res, stat;
1da177e4 7331
b1235d79 7332 if (!status) {
bdc25783 7333 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7334 res = L2CAP_CR_PEND;
7335 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7336 chan->ops->defer(chan);
df3c3931 7337 } else {
acdcabf5 7338 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7339 res = L2CAP_CR_SUCCESS;
7340 stat = L2CAP_CS_NO_INFO;
7341 }
b1235d79 7342 } else {
acdcabf5 7343 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7344 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7345 res = L2CAP_CR_SEC_BLOCK;
7346 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7347 }
7348
fe4128e0
GP		 7349 rsp.scid = cpu_to_le16(chan->dcid);
7350 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7351 rsp.result = cpu_to_le16(res);
7352 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7353 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7354 sizeof(rsp), &rsp);
2d369359
MM		 7355
7356 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7357 res == L2CAP_CR_SUCCESS) {
7358 char buf[128];
7359 set_bit(CONF_REQ_SENT, &chan->conf_state);
7360 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7361 L2CAP_CONF_REQ,
7362 l2cap_build_conf_req(chan, buf),
7363 buf);
7364 chan->num_conf_req++;
7365 }
b1235d79 7366 }
1da177e4 7367
6be36555 7368 l2cap_chan_unlock(chan);
1da177e4
LT		 7369 }
7370
3df91ea2 7371 mutex_unlock(&conn->chan_lock);
b1235d79 7372
1da177e4
LT		 7373 return 0;
7374}
7375
686ebf28 7376int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7377{
7378 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7379 struct l2cap_hdr *hdr;
7380 int len;
1da177e4 7381
1d13a254
AE		 7382 /* For AMP controller do not create l2cap conn */
7383 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7384 goto drop;
1da177e4 7385
5a08ecce 7386 if (!conn)
baf43251 7387 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7388
7389 if (!conn)
1da177e4
LT		 7390 goto drop;
7391
7392 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7393
d73a0988
AE		 7394 switch (flags) {
7395 case ACL_START:
7396 case ACL_START_NO_FLUSH:
7397 case ACL_COMPLETE:
1da177e4
LT		 7398 if (conn->rx_len) {
7399 BT_ERR("Unexpected start frame (len %d)", skb->len);
7400 kfree_skb(conn->rx_skb);
7401 conn->rx_skb = NULL;
7402 conn->rx_len = 0;
7403 l2cap_conn_unreliable(conn, ECOMM);
7404 }
7405
aae7fe22
AE		 7406 /* Start fragment always begin with Basic L2CAP header */
7407 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7408 BT_ERR("Frame is too short (len %d)", skb->len);
7409 l2cap_conn_unreliable(conn, ECOMM);
7410 goto drop;
7411 }
7412
7413 hdr = (struct l2cap_hdr *) skb->data;
7414 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7415
7416 if (len == skb->len) {
7417 /* Complete frame received */
7418 l2cap_recv_frame(conn, skb);
7419 return 0;
7420 }
7421
7422 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7423
7424 if (skb->len > len) {
7425 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7426 skb->len, len);
1da177e4
LT		 7427 l2cap_conn_unreliable(conn, ECOMM);
7428 goto drop;
7429 }
7430
7431 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7432 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7433 if (!conn->rx_skb)
1da177e4
LT		 7434 goto drop;
7435
d626f62b 7436 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7437 skb->len);
1da177e4 7438 conn->rx_len = len - skb->len;
d73a0988
AE		 7439 break;
7440
7441 case ACL_CONT:
1da177e4
LT		 7442 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7443
7444 if (!conn->rx_len) {
7445 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7446 l2cap_conn_unreliable(conn, ECOMM);
7447 goto drop;
7448 }
7449
7450 if (skb->len > conn->rx_len) {
7451 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7452 skb->len, conn->rx_len);
1da177e4
LT		 7453 kfree_skb(conn->rx_skb);
7454 conn->rx_skb = NULL;
7455 conn->rx_len = 0;
7456 l2cap_conn_unreliable(conn, ECOMM);
7457 goto drop;
7458 }
7459
d626f62b 7460 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7461 skb->len);
1da177e4
LT		 7462 conn->rx_len -= skb->len;
7463
7464 if (!conn->rx_len) {
c4e5bafa
JH		 7465 /* Complete frame received. l2cap_recv_frame
7466 * takes ownership of the skb so set the global
7467 * rx_skb pointer to NULL first.
7468 */
7469 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7470 conn->rx_skb = NULL;
c4e5bafa 7471 l2cap_recv_frame(conn, rx_skb);
1da177e4 7472 }
d73a0988 7473 break;
1da177e4
LT		 7474 }
7475
7476drop:
7477 kfree_skb(skb);
7478 return 0;
7479}
7480
aef7d97c 7481static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7482{
23691d75 7483 struct l2cap_chan *c;
1da177e4 7484
333055f2 7485 read_lock(&chan_list_lock);
1da177e4 7486
23691d75 7487 list_for_each_entry(c, &chan_list, global_l) {
fcb73338 7488 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7eafc59e 7489 &c->src, &c->dst,
fcb73338
AE		 7490 c->state, __le16_to_cpu(c->psm),
7491 c->scid, c->dcid, c->imtu, c->omtu,
7492 c->sec_level, c->mode);
61e1b4b7 7493 }
1da177e4 7494
333055f2 7495 read_unlock(&chan_list_lock);
1da177e4 7496
aef7d97c 7497 return 0;
1da177e4
LT		 7498}
7499
aef7d97c
MH		 7500static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7501{
7502 return single_open(file, l2cap_debugfs_show, inode->i_private);
7503}
7504
7505static const struct file_operations l2cap_debugfs_fops = {
7506 .open = l2cap_debugfs_open,
7507 .read = seq_read,
7508 .llseek = seq_lseek,
7509 .release = single_release,
7510};
7511
7512static struct dentry *l2cap_debugfs;
1da177e4 7513
64274518 7514int __init l2cap_init(void)
1da177e4
LT		 7515{
7516 int err;
be9d1227 7517
bb58f747 7518 err = l2cap_init_sockets();
1da177e4
LT		 7519 if (err < 0)
7520 return err;
7521
1120e4bf
MH		 7522 if (IS_ERR_OR_NULL(bt_debugfs))
7523 return 0;
7524
7525 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7526 NULL, &l2cap_debugfs_fops);
1da177e4 7527
40b9397a 7528 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
f15b8ecf 7529 &le_max_credits);
40b9397a 7530 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
f15b8ecf
JH		 7531 &le_default_mps);
7532
1da177e4 7533 return 0;
1da177e4
LT		 7534}
7535
64274518 7536void l2cap_exit(void)
1da177e4 7537{
aef7d97c 7538 debugfs_remove(l2cap_debugfs);
bb58f747 7539 l2cap_cleanup_sockets();
1da177e4
LT		 7540}
7541
d1c4a17d
GP		 7542module_param(disable_ertm, bool, 0644);
7543MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
This page took 1.494321 seconds and 5 git commands to generate.