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Bluetooth: Enable duplicates filter in background scan
[linux-2.6-block.git] / net / bluetooth / l2cap_core.c
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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"
18722c24 43#include "6lowpan.h"
1da177e4 44
0f1bfe4e
JH		 45#define LE_FLOWCTL_MAX_CREDITS 65535
46
d1de6d46 47bool disable_ertm;
f0709e03 48
547d1032 49static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
d40bffbc 50static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, };
1da177e4 51
b5ad8b7f
JB		 52static LIST_HEAD(chan_list);
53static DEFINE_RWLOCK(chan_list_lock);
1da177e4 54
f15b8ecf
JH		 55static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
56static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
57
1da177e4 58static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 59 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 60static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 61 void *data);
710f9b0a 62static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 63static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 64
d660366d 65static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 66 struct sk_buff_head *skbs, u8 event);
608bcc6d 67
4f1654e0
MH		 68static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
69{
70 if (hcon->type == LE_LINK) {
71 if (type == ADDR_LE_DEV_PUBLIC)
72 return BDADDR_LE_PUBLIC;
73 else
74 return BDADDR_LE_RANDOM;
75 }
76
77 return BDADDR_BREDR;
78}
79
0139418c 80/* ---- L2CAP channels ---- */
71ba0e56 81
2d792818
GP		 82static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
83 u16 cid)
0139418c 84{
3df91ea2 85 struct l2cap_chan *c;
3d57dc68 86
3df91ea2
AE		 87 list_for_each_entry(c, &conn->chan_l, list) {
88 if (c->dcid == cid)
89 return c;
0139418c 90 }
3df91ea2 91 return NULL;
0139418c
MH		 92}
93
2d792818
GP		 94static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
95 u16 cid)
0139418c 96{
3df91ea2 97 struct l2cap_chan *c;
3d57dc68 98
3df91ea2
AE		 99 list_for_each_entry(c, &conn->chan_l, list) {
100 if (c->scid == cid)
101 return c;
0139418c 102 }
3df91ea2 103 return NULL;
0139418c
MH		 104}
105
106/* Find channel with given SCID.
ef191ade 107 * Returns locked channel. */
2d792818
GP		 108static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
109 u16 cid)
0139418c 110{
48454079 111 struct l2cap_chan *c;
baa7e1fa 112
3df91ea2 113 mutex_lock(&conn->chan_lock);
baa7e1fa 114 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 115 if (c)
116 l2cap_chan_lock(c);
3df91ea2
AE		 117 mutex_unlock(&conn->chan_lock);
118
48454079 119 return c;
0139418c
MH		 120}
121
b1a130b7
MM		 122/* Find channel with given DCID.
123 * Returns locked channel.
124 */
125static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
126 u16 cid)
127{
128 struct l2cap_chan *c;
129
130 mutex_lock(&conn->chan_lock);
131 c = __l2cap_get_chan_by_dcid(conn, cid);
132 if (c)
133 l2cap_chan_lock(c);
134 mutex_unlock(&conn->chan_lock);
135
136 return c;
137}
138
2d792818
GP		 139static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
140 u8 ident)
0139418c 141{
3df91ea2 142 struct l2cap_chan *c;
3d57dc68 143
3df91ea2
AE		 144 list_for_each_entry(c, &conn->chan_l, list) {
145 if (c->ident == ident)
146 return c;
0139418c 147 }
3df91ea2 148 return NULL;
0139418c
MH		 149}
150
5b155ef9
MM		 151static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
152 u8 ident)
153{
154 struct l2cap_chan *c;
155
156 mutex_lock(&conn->chan_lock);
157 c = __l2cap_get_chan_by_ident(conn, ident);
158 if (c)
159 l2cap_chan_lock(c);
160 mutex_unlock(&conn->chan_lock);
161
162 return c;
163}
164
23691d75 165static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 166{
23691d75 167 struct l2cap_chan *c;
9e4425ff 168
23691d75 169 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 170 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 171 return c;
9e4425ff 172 }
250938cb 173 return NULL;
9e4425ff
GP		 174}
175
176int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
177{
73b2ec18
GP		 178 int err;
179
333055f2 180 write_lock(&chan_list_lock);
9e4425ff 181
23691d75 182 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 183 err = -EADDRINUSE;
184 goto done;
9e4425ff
GP		 185 }
186
73b2ec18
GP		 187 if (psm) {
188 chan->psm = psm;
189 chan->sport = psm;
190 err = 0;
191 } else {
192 u16 p;
193
194 err = -EINVAL;
195 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 196 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 197 chan->psm = cpu_to_le16(p);
198 chan->sport = cpu_to_le16(p);
199 err = 0;
200 break;
201 }
202 }
9e4425ff 203
73b2ec18 204done:
333055f2 205 write_unlock(&chan_list_lock);
73b2ec18 206 return err;
9e4425ff
GP		 207}
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}
440
144ad330 441static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 442{
144ad330
SS		 443 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
444
4af66c69
JK		 445 BT_DBG("chan %p", chan);
446
333055f2 447 write_lock(&chan_list_lock);
23691d75 448 list_del(&chan->global_l);
333055f2 449 write_unlock(&chan_list_lock);
23691d75 450
4af66c69 451 kfree(chan);
6ff5abbf
GP		 452}
453
30648372
JK		 454void l2cap_chan_hold(struct l2cap_chan *c)
455{
144ad330 456 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 457
144ad330 458 kref_get(&c->kref);
30648372
JK		 459}
460
461void l2cap_chan_put(struct l2cap_chan *c)
462{
144ad330 463 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 464
144ad330 465 kref_put(&c->kref, l2cap_chan_destroy);
30648372
JK		 466}
467
bd4b1653
AE		 468void l2cap_chan_set_defaults(struct l2cap_chan *chan)
469{
470 chan->fcs = L2CAP_FCS_CRC16;
471 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
472 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
473 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
c20f8e35 474 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653
AE		 475 chan->sec_level = BT_SECURITY_LOW;
476
477 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
478}
479
0ce43ce6 480static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 481{
0ce43ce6
JH		 482 chan->sdu = NULL;
483 chan->sdu_last_frag = NULL;
484 chan->sdu_len = 0;
0cd75f7e 485 chan->tx_credits = 0;
f15b8ecf 486 chan->rx_credits = le_max_credits;
d1d79413 487 chan->mps = min_t(u16, chan->imtu, le_default_mps);
0ce43ce6
JH		 488
489 skb_queue_head_init(&chan->tx_q);
38319713
JH		 490}
491
93c3e8f5 492void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 493{
af05b30b 494 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 495 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 496
9f5a0d7b 497 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 498
8c1d787b 499 chan->conn = conn;
0139418c 500
5491120e
AE		 501 switch (chan->chan_type) {
502 case L2CAP_CHAN_CONN_ORIENTED:
21626e62
JH		 503 /* Alloc CID for connection-oriented socket */
504 chan->scid = l2cap_alloc_cid(conn);
505 if (conn->hcon->type == ACL_LINK)
0c1bc5c6 506 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 507 break;
508
509 case L2CAP_CHAN_CONN_LESS:
0139418c 510 /* Connectionless socket */
fe4128e0
GP		 511 chan->scid = L2CAP_CID_CONN_LESS;
512 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 513 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 514 break;
515
2338a7e0
JH		 516 case L2CAP_CHAN_FIXED:
517 /* Caller will set CID and CID specific MTU values */
416fa752
AE		 518 break;
519
5491120e 520 default:
0139418c 521 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 522 chan->scid = L2CAP_CID_SIGNALING;
523 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 524 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 525 }
526
8f7975b1
AE		 527 chan->local_id = L2CAP_BESTEFFORT_ID;
528 chan->local_stype = L2CAP_SERV_BESTEFFORT;
529 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
530 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
531 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 532 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 533
371fd835 534 l2cap_chan_hold(chan);
baa7e1fa 535
5ee9891d
JH		 536 hci_conn_hold(conn->hcon);
537
3df91ea2 538 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 539}
540
466f8004 541void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 542{
543 mutex_lock(&conn->chan_lock);
544 __l2cap_chan_add(conn, chan);
3df91ea2 545 mutex_unlock(&conn->chan_lock);
0139418c
MH		 546}
547
466f8004 548void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 549{
8c1d787b 550 struct l2cap_conn *conn = chan->conn;
0139418c 551
c9b66675 552 __clear_chan_timer(chan);
0139418c 553
49208c9c 554 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 555
8e87d142 556 if (conn) {
56f60984 557 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 558 /* Delete from channel list */
3df91ea2 559 list_del(&chan->list);
3d57dc68 560
371fd835 561 l2cap_chan_put(chan);
baa7e1fa 562
8c1d787b 563 chan->conn = NULL;
3cabbfda 564
2338a7e0 565 if (chan->scid != L2CAP_CID_A2MP)
76a68ba0 566 hci_conn_drop(conn->hcon);
56f60984
AE		 567
568 if (mgr && mgr->bredr_chan == chan)
569 mgr->bredr_chan = NULL;
0139418c
MH		 570 }
571
419e08c1
AE		 572 if (chan->hs_hchan) {
573 struct hci_chan *hs_hchan = chan->hs_hchan;
574
575 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
576 amp_disconnect_logical_link(hs_hchan);
577 }
578
b699ec0d 579 chan->ops->teardown(chan, err);
6be36555 580
2827011f 581 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 582 return;
2ead70b8 583
ee556f66
GP		 584 switch(chan->mode) {
585 case L2CAP_MODE_BASIC:
586 break;
c13ffa62 587
38319713 588 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 589 skb_queue_purge(&chan->tx_q);
38319713
JH		 590 break;
591
ee556f66 592 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 593 __clear_retrans_timer(chan);
594 __clear_monitor_timer(chan);
595 __clear_ack_timer(chan);
c13ffa62 596
f1c6775b 597 skb_queue_purge(&chan->srej_q);
c13ffa62 598
3c588192
MM		 599 l2cap_seq_list_free(&chan->srej_list);
600 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 601
602 /* fall through */
603
604 case L2CAP_MODE_STREAMING:
605 skb_queue_purge(&chan->tx_q);
606 break;
c13ffa62 607 }
ee556f66
GP		 608
609 return;
0139418c
MH		 610}
611
387a33e3
JH		 612void l2cap_conn_update_id_addr(struct hci_conn *hcon)
613{
614 struct l2cap_conn *conn = hcon->l2cap_data;
615 struct l2cap_chan *chan;
616
617 mutex_lock(&conn->chan_lock);
618
619 list_for_each_entry(chan, &conn->chan_l, list) {
620 l2cap_chan_lock(chan);
621 bacpy(&chan->dst, &hcon->dst);
622 chan->dst_type = bdaddr_type(hcon, hcon->dst_type);
623 l2cap_chan_unlock(chan);
624 }
625
626 mutex_unlock(&conn->chan_lock);
627}
628
27e2d4c8
JH		 629static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
630{
631 struct l2cap_conn *conn = chan->conn;
632 struct l2cap_le_conn_rsp rsp;
633 u16 result;
634
635 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
636 result = L2CAP_CR_AUTHORIZATION;
637 else
638 result = L2CAP_CR_BAD_PSM;
639
640 l2cap_state_change(chan, BT_DISCONN);
641
642 rsp.dcid = cpu_to_le16(chan->scid);
643 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 644 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 645 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 646 rsp.result = cpu_to_le16(result);
647
648 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
649 &rsp);
650}
651
791d60f7
JH		 652static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
653{
654 struct l2cap_conn *conn = chan->conn;
655 struct l2cap_conn_rsp rsp;
656 u16 result;
657
658 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
659 result = L2CAP_CR_SEC_BLOCK;
660 else
661 result = L2CAP_CR_BAD_PSM;
662
663 l2cap_state_change(chan, BT_DISCONN);
664
665 rsp.scid = cpu_to_le16(chan->dcid);
666 rsp.dcid = cpu_to_le16(chan->scid);
667 rsp.result = cpu_to_le16(result);
668 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
669
670 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
671}
672
0f852724 673void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 674{
675 struct l2cap_conn *conn = chan->conn;
4519de9a 676
7eafc59e 677 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 678
89bc500e 679 switch (chan->state) {
4519de9a 680 case BT_LISTEN:
b699ec0d 681 chan->ops->teardown(chan, 0);
4519de9a
GP		 682 break;
683
684 case BT_CONNECTED:
685 case BT_CONFIG:
7b25c9b3 686 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
8d836d71 687 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 688 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 689 } else
690 l2cap_chan_del(chan, reason);
691 break;
692
693 case BT_CONNECT2:
791d60f7
JH		 694 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
695 if (conn->hcon->type == ACL_LINK)
696 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 697 else if (conn->hcon->type == LE_LINK)
698 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 699 }
700
701 l2cap_chan_del(chan, reason);
702 break;
703
704 case BT_CONNECT:
705 case BT_DISCONN:
706 l2cap_chan_del(chan, reason);
707 break;
708
709 default:
b699ec0d 710 chan->ops->teardown(chan, 0);
4519de9a
GP		 711 break;
712 }
713}
714
4343478f 715static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 716{
6a974b50
MH		 717 switch (chan->chan_type) {
718 case L2CAP_CHAN_RAW:
4343478f 719 switch (chan->sec_level) {
8556edd3 720 case BT_SECURITY_HIGH:
7d513e92 721 case BT_SECURITY_FIPS:
8556edd3
JH		 722 return HCI_AT_DEDICATED_BONDING_MITM;
723 case BT_SECURITY_MEDIUM:
724 return HCI_AT_DEDICATED_BONDING;
725 default:
726 return HCI_AT_NO_BONDING;
727 }
6a974b50 728 break;
3124b843
MH		 729 case L2CAP_CHAN_CONN_LESS:
730 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) {
731 if (chan->sec_level == BT_SECURITY_LOW)
732 chan->sec_level = BT_SECURITY_SDP;
733 }
7d513e92
MH		 734 if (chan->sec_level == BT_SECURITY_HIGH ||
735 chan->sec_level == BT_SECURITY_FIPS)
3124b843
MH		 736 return HCI_AT_NO_BONDING_MITM;
737 else
738 return HCI_AT_NO_BONDING;
739 break;
6a974b50
MH		 740 case L2CAP_CHAN_CONN_ORIENTED:
741 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
742 if (chan->sec_level == BT_SECURITY_LOW)
743 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 744
7d513e92
MH		 745 if (chan->sec_level == BT_SECURITY_HIGH ||
746 chan->sec_level == BT_SECURITY_FIPS)
6a974b50
MH		 747 return HCI_AT_NO_BONDING_MITM;
748 else
749 return HCI_AT_NO_BONDING;
750 }
751 /* fall through */
752 default:
4343478f 753 switch (chan->sec_level) {
00ae4af9 754 case BT_SECURITY_HIGH:
7d513e92 755 case BT_SECURITY_FIPS:
8556edd3 756 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 757 case BT_SECURITY_MEDIUM:
8556edd3 758 return HCI_AT_GENERAL_BONDING;
00ae4af9 759 default:
8556edd3 760 return HCI_AT_NO_BONDING;
00ae4af9 761 }
6a974b50 762 break;
0684e5f9 763 }
8556edd3
JH		 764}
765
766/* Service level security */
d45fc423 767int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 768{
8c1d787b 769 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 770 __u8 auth_type;
771
a17de2fe
JH		 772 if (conn->hcon->type == LE_LINK)
773 return smp_conn_security(conn->hcon, chan->sec_level);
774
4343478f 775 auth_type = l2cap_get_auth_type(chan);
79d554a6 776
4343478f 777 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 778}
779
b5ad8b7f 780static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 781{
782 u8 id;
783
784 /* Get next available identificator.
785 * 1 - 128 are used by kernel.
786 * 129 - 199 are reserved.
787 * 200 - 254 are used by utilities like l2ping, etc.
788 */
789
333055f2 790 spin_lock(&conn->lock);
4e8402a3
MH		 791
792 if (++conn->tx_ident > 128)
793 conn->tx_ident = 1;
794
795 id = conn->tx_ident;
796
333055f2 797 spin_unlock(&conn->lock);
4e8402a3
MH		 798
799 return id;
800}
801
2d792818
GP		 802static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
803 void *data)
4e8402a3
MH		 804{
805 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 806 u8 flags;
4e8402a3
MH		 807
808 BT_DBG("code 0x%2.2x", code);
809
810 if (!skb)
9a9c6a34 811 return;
4e8402a3 812
e702112f
AE		 813 if (lmp_no_flush_capable(conn->hcon->hdev))
814 flags = ACL_START_NO_FLUSH;
815 else
816 flags = ACL_START;
817
14b12d0b 818 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 819 skb->priority = HCI_PRIO_MAX;
14b12d0b 820
73d80deb
LAD		 821 hci_send_acl(conn->hchan, skb, flags);
822}
823
02b0fbb9
MM		 824static bool __chan_is_moving(struct l2cap_chan *chan)
825{
826 return chan->move_state != L2CAP_MOVE_STABLE &&
827 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
828}
829
73d80deb
LAD		 830static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
831{
832 struct hci_conn *hcon = chan->conn->hcon;
833 u16 flags;
834
835 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 836 skb->priority);
73d80deb 837
d5f8a75d
MM		 838 if (chan->hs_hcon && !__chan_is_moving(chan)) {
839 if (chan->hs_hchan)
840 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
841 else
842 kfree_skb(skb);
843
844 return;
845 }
846
73d80deb 847 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 848 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 849 flags = ACL_START_NO_FLUSH;
850 else
851 flags = ACL_START;
14b12d0b 852
73d80deb
LAD		 853 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
854 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 855}
856
b76bbd66
MM		 857static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
858{
859 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
860 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
861
862 if (enh & L2CAP_CTRL_FRAME_TYPE) {
863 /* S-Frame */
864 control->sframe = 1;
865 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
866 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
867
868 control->sar = 0;
869 control->txseq = 0;
870 } else {
871 /* I-Frame */
872 control->sframe = 0;
873 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
874 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
875
876 control->poll = 0;
877 control->super = 0;
878 }
879}
880
b76bbd66
MM		 881static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
882{
883 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
884 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
885
886 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
887 /* S-Frame */
888 control->sframe = 1;
889 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
890 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
891
892 control->sar = 0;
893 control->txseq = 0;
894 } else {
895 /* I-Frame */
896 control->sframe = 0;
897 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
898 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
899
900 control->poll = 0;
901 control->super = 0;
902 }
903}
904
905static inline void __unpack_control(struct l2cap_chan *chan,
906 struct sk_buff *skb)
907{
908 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
909 __unpack_extended_control(get_unaligned_le32(skb->data),
910 &bt_cb(skb)->control);
cec8ab6e 911 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 912 } else {
913 __unpack_enhanced_control(get_unaligned_le16(skb->data),
914 &bt_cb(skb)->control);
cec8ab6e 915 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 916 }
917}
918
b5c6aaed
MM		 919static u32 __pack_extended_control(struct l2cap_ctrl *control)
920{
921 u32 packed;
922
923 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
924 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
925
926 if (control->sframe) {
927 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
928 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
929 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
930 } else {
931 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
932 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
933 }
934
935 return packed;
936}
937
938static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
939{
940 u16 packed;
941
942 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
943 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
944
945 if (control->sframe) {
946 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
947 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
948 packed |= L2CAP_CTRL_FRAME_TYPE;
949 } else {
950 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
951 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
952 }
953
954 return packed;
955}
956
b76bbd66
MM		 957static inline void __pack_control(struct l2cap_chan *chan,
958 struct l2cap_ctrl *control,
959 struct sk_buff *skb)
960{
961 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
962 put_unaligned_le32(__pack_extended_control(control),
963 skb->data + L2CAP_HDR_SIZE);
964 } else {
965 put_unaligned_le16(__pack_enhanced_control(control),
966 skb->data + L2CAP_HDR_SIZE);
967 }
968}
969
ba7aa64f
GP		 970static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
971{
972 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
973 return L2CAP_EXT_HDR_SIZE;
974 else
975 return L2CAP_ENH_HDR_SIZE;
976}
977
a67d7f6f
MM		 978static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
979 u32 control)
b5c6aaed
MM		 980{
981 struct sk_buff *skb;
982 struct l2cap_hdr *lh;
ba7aa64f 983 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 984
985 if (chan->fcs == L2CAP_FCS_CRC16)
986 hlen += L2CAP_FCS_SIZE;
987
a67d7f6f 988 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 989
b5c6aaed 990 if (!skb)
a67d7f6f 991 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 992
993 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
994 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
995 lh->cid = cpu_to_le16(chan->dcid);
996
a67d7f6f
MM		 997 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
998 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
999 else
1000 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 1001
1002 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 1003 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 1004 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1005 }
1006
1007 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 1008 return skb;
1009}
1010
1011static void l2cap_send_sframe(struct l2cap_chan *chan,
1012 struct l2cap_ctrl *control)
1013{
1014 struct sk_buff *skb;
1015 u32 control_field;
1016
1017 BT_DBG("chan %p, control %p", chan, control);
1018
1019 if (!control->sframe)
1020 return;
1021
b99e13ad
MM		 1022 if (__chan_is_moving(chan))
1023 return;
1024
a67d7f6f
MM		 1025 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1026 !control->poll)
1027 control->final = 1;
1028
1029 if (control->super == L2CAP_SUPER_RR)
1030 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1031 else if (control->super == L2CAP_SUPER_RNR)
1032 set_bit(CONN_RNR_SENT, &chan->conn_state);
1033
1034 if (control->super != L2CAP_SUPER_SREJ) {
1035 chan->last_acked_seq = control->reqseq;
1036 __clear_ack_timer(chan);
1037 }
1038
1039 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1040 control->final, control->poll, control->super);
1041
1042 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1043 control_field = __pack_extended_control(control);
1044 else
1045 control_field = __pack_enhanced_control(control);
1046
1047 skb = l2cap_create_sframe_pdu(chan, control_field);
1048 if (!IS_ERR(skb))
1049 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1050}
1051
c9e3d5e0 1052static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1053{
c9e3d5e0
MM		 1054 struct l2cap_ctrl control;
1055
1056 BT_DBG("chan %p, poll %d", chan, poll);
1057
1058 memset(&control, 0, sizeof(control));
1059 control.sframe = 1;
1060 control.poll = poll;
1061
1062 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1063 control.super = L2CAP_SUPER_RNR;
1064 else
1065 control.super = L2CAP_SUPER_RR;
b5c6aaed 1066
c9e3d5e0
MM		 1067 control.reqseq = chan->buffer_seq;
1068 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1069}
1070
b4450035 1071static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1072{
c1360a1c 1073 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1074}
1075
1df7b17a 1076static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1077{
1df7b17a 1078 struct l2cap_conn *conn = chan->conn;
80d58d0b 1079 struct hci_dev *hdev;
1df7b17a
MH		 1080 bool amp_available = false;
1081
1082 if (!conn->hs_enabled)
1083 return false;
1084
1085 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1086 return false;
80d58d0b
MH		 1087
1088 read_lock(&hci_dev_list_lock);
1df7b17a 1089 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1090 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1091 test_bit(HCI_UP, &hdev->flags)) {
1092 amp_available = true;
1093 break;
1094 }
1095 }
80d58d0b
MH		 1096 read_unlock(&hci_dev_list_lock);
1097
1df7b17a
MH		 1098 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1099 return amp_available;
848566b3
MH		 1100
1101 return false;
93c3e8f5
AE		 1102}
1103
5ce66b59
AE		 1104static bool l2cap_check_efs(struct l2cap_chan *chan)
1105{
1106 /* Check EFS parameters */
1107 return true;
1108}
1109
2766be48 1110void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1111{
1112 struct l2cap_conn *conn = chan->conn;
1113 struct l2cap_conn_req req;
1114
1115 req.scid = cpu_to_le16(chan->scid);
1116 req.psm = chan->psm;
1117
1118 chan->ident = l2cap_get_ident(conn);
1119
1120 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1121
1122 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1123}
1124
8eb200bd
MM		 1125static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1126{
1127 struct l2cap_create_chan_req req;
1128 req.scid = cpu_to_le16(chan->scid);
1129 req.psm = chan->psm;
1130 req.amp_id = amp_id;
1131
1132 chan->ident = l2cap_get_ident(chan->conn);
1133
1134 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1135 sizeof(req), &req);
1136}
1137
02b0fbb9
MM		 1138static void l2cap_move_setup(struct l2cap_chan *chan)
1139{
1140 struct sk_buff *skb;
1141
1142 BT_DBG("chan %p", chan);
1143
1144 if (chan->mode != L2CAP_MODE_ERTM)
1145 return;
1146
1147 __clear_retrans_timer(chan);
1148 __clear_monitor_timer(chan);
1149 __clear_ack_timer(chan);
1150
1151 chan->retry_count = 0;
1152 skb_queue_walk(&chan->tx_q, skb) {
1153 if (bt_cb(skb)->control.retries)
1154 bt_cb(skb)->control.retries = 1;
1155 else
1156 break;
1157 }
1158
1159 chan->expected_tx_seq = chan->buffer_seq;
1160
1161 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1162 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1163 l2cap_seq_list_clear(&chan->retrans_list);
1164 l2cap_seq_list_clear(&chan->srej_list);
1165 skb_queue_purge(&chan->srej_q);
1166
1167 chan->tx_state = L2CAP_TX_STATE_XMIT;
1168 chan->rx_state = L2CAP_RX_STATE_MOVE;
1169
1170 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1171}
1172
5f3847a4
MM		 1173static void l2cap_move_done(struct l2cap_chan *chan)
1174{
1175 u8 move_role = chan->move_role;
1176 BT_DBG("chan %p", chan);
1177
1178 chan->move_state = L2CAP_MOVE_STABLE;
1179 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1180
1181 if (chan->mode != L2CAP_MODE_ERTM)
1182 return;
1183
1184 switch (move_role) {
1185 case L2CAP_MOVE_ROLE_INITIATOR:
1186 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1187 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1188 break;
1189 case L2CAP_MOVE_ROLE_RESPONDER:
1190 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1191 break;
1192 }
1193}
1194
9f0caeb1
VCG		 1195static void l2cap_chan_ready(struct l2cap_chan *chan)
1196{
2827011f 1197 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1198 chan->conf_state = 0;
1199 __clear_chan_timer(chan);
1200
0ce43ce6
JH		 1201 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1202 chan->ops->suspend(chan);
177f8f2b 1203
54a59aa2 1204 chan->state = BT_CONNECTED;
9f0caeb1 1205
fd83e2c2 1206 chan->ops->ready(chan);
9f0caeb1
VCG		 1207}
1208
f1496dee
JH		 1209static void l2cap_le_connect(struct l2cap_chan *chan)
1210{
1211 struct l2cap_conn *conn = chan->conn;
1212 struct l2cap_le_conn_req req;
1213
595177f3
JH		 1214 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1215 return;
1216
f1496dee
JH		 1217 req.psm = chan->psm;
1218 req.scid = cpu_to_le16(chan->scid);
1219 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1220 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1221 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1222
1223 chan->ident = l2cap_get_ident(conn);
1224
1225 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1226 sizeof(req), &req);
1227}
1228
1229static void l2cap_le_start(struct l2cap_chan *chan)
1230{
1231 struct l2cap_conn *conn = chan->conn;
1232
1233 if (!smp_conn_security(conn->hcon, chan->sec_level))
1234 return;
1235
1236 if (!chan->psm) {
1237 l2cap_chan_ready(chan);
1238 return;
1239 }
1240
1241 if (chan->state == BT_CONNECT)
1242 l2cap_le_connect(chan);
1243}
1244
93c3e8f5
AE		 1245static void l2cap_start_connection(struct l2cap_chan *chan)
1246{
1247 if (__amp_capable(chan)) {
1248 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1249 a2mp_discover_amp(chan);
f1496dee
JH		 1250 } else if (chan->conn->hcon->type == LE_LINK) {
1251 l2cap_le_start(chan);
93c3e8f5
AE		 1252 } else {
1253 l2cap_send_conn_req(chan);
1254 }
1255}
1256
fc7f8a7e 1257static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1258{
8c1d787b 1259 struct l2cap_conn *conn = chan->conn;
79d554a6 1260
9f0caeb1 1261 if (conn->hcon->type == LE_LINK) {
96ac34fb 1262 l2cap_le_start(chan);
9f0caeb1
VCG		 1263 return;
1264 }
1265
79d554a6 1266 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1267 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1268 return;
1269
d45fc423 1270 if (l2cap_chan_check_security(chan) &&
2d792818 1271 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1272 l2cap_start_connection(chan);
1273 }
79d554a6
MH		 1274 } else {
1275 struct l2cap_info_req req;
ac73498c 1276 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1277
1278 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1279 conn->info_ident = l2cap_get_ident(conn);
1280
ba13ccd9 1281 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1282
2d792818
GP		 1283 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1284 sizeof(req), &req);
79d554a6
MH		 1285 }
1286}
1287
cf6c2c0b
GP		 1288static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1289{
1290 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1291 if (!disable_ertm)
cf6c2c0b
GP		 1292 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1293
1294 switch (mode) {
1295 case L2CAP_MODE_ERTM:
1296 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1297 case L2CAP_MODE_STREAMING:
1298 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1299 default:
1300 return 0x00;
1301 }
1302}
1303
5e4e3972 1304static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1305{
5e4e3972 1306 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1307 struct l2cap_disconn_req req;
1308
c13ffa62
GP		 1309 if (!conn)
1310 return;
1311
aad3d0e3 1312 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1313 __clear_retrans_timer(chan);
1314 __clear_monitor_timer(chan);
1315 __clear_ack_timer(chan);
c13ffa62
GP		 1316 }
1317
2338a7e0 1318 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1319 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1320 return;
1321 }
1322
fe4128e0
GP		 1323 req.dcid = cpu_to_le16(chan->dcid);
1324 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1325 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1326 sizeof(req), &req);
c13ffa62 1327
f8e73017 1328 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1329}
1330
1da177e4 1331/* ---- L2CAP connections ---- */
4e8402a3
MH		 1332static void l2cap_conn_start(struct l2cap_conn *conn)
1333{
3df91ea2 1334 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1335
1336 BT_DBG("conn %p", conn);
1337
3df91ea2 1338 mutex_lock(&conn->chan_lock);
4e8402a3 1339
3df91ea2 1340 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1341 l2cap_chan_lock(chan);
4e8402a3 1342
715ec005 1343 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1344 l2cap_chan_unlock(chan);
79d554a6
MH		 1345 continue;
1346 }
1347
89bc500e 1348 if (chan->state == BT_CONNECT) {
d45fc423 1349 if (!l2cap_chan_check_security(chan) ||
2d792818 1350 !__l2cap_no_conn_pending(chan)) {
6be36555 1351 l2cap_chan_unlock(chan);
47731de7
GP		 1352 continue;
1353 }
79d554a6 1354
c1360a1c 1355 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1356 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1357 &chan->conf_state)) {
89bc500e 1358 l2cap_chan_close(chan, ECONNRESET);
6be36555 1359 l2cap_chan_unlock(chan);
47731de7 1360 continue;
b1235d79 1361 }
47731de7 1362
93c3e8f5 1363 l2cap_start_connection(chan);
47731de7 1364
89bc500e 1365 } else if (chan->state == BT_CONNECT2) {
79d554a6 1366 struct l2cap_conn_rsp rsp;
e9aeb2dd 1367 char buf[128];
fe4128e0
GP		 1368 rsp.scid = cpu_to_le16(chan->dcid);
1369 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1370
d45fc423 1371 if (l2cap_chan_check_security(chan)) {
bdc25783 1372 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
ac73498c
AE		 1373 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1374 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1375 chan->ops->defer(chan);
f66dc81f
MH		 1376
1377 } else {
acdcabf5 1378 l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1379 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1380 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1381 }
79d554a6 1382 } else {
ac73498c
AE		 1383 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1384 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1385 }
1386
fc7f8a7e 1387 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1388 sizeof(rsp), &rsp);
e9aeb2dd 1389
c1360a1c 1390 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1391 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1392 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1393 continue;
1394 }
1395
c1360a1c 1396 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1397 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1398 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1399 chan->num_conf_req++;
4e8402a3
MH		 1400 }
1401
6be36555 1402 l2cap_chan_unlock(chan);
4e8402a3
MH		 1403 }
1404
3df91ea2 1405 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1406}
1407
c2287681 1408/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1409 * Returns closest match, locked.
1410 */
d9b88702 1411static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1412 bdaddr_t *src,
1413 bdaddr_t *dst)
b62f328b 1414{
23691d75 1415 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1416
23691d75 1417 read_lock(&chan_list_lock);
b62f328b 1418
23691d75 1419 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1420 if (state && c->state != state)
b62f328b
VT		 1421 continue;
1422
23691d75 1423 if (c->scid == cid) {
c2287681
IY		 1424 int src_match, dst_match;
1425 int src_any, dst_any;
1426
b62f328b 1427 /* Exact match. */
7eafc59e
MH		 1428 src_match = !bacmp(&c->src, src);
1429 dst_match = !bacmp(&c->dst, dst);
c2287681 1430 if (src_match && dst_match) {
23691d75
GP		 1431 read_unlock(&chan_list_lock);
1432 return c;
1433 }
b62f328b
VT		 1434
1435 /* Closest match */
7eafc59e
MH		 1436 src_any = !bacmp(&c->src, BDADDR_ANY);
1437 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1438 if ((src_match && dst_any) || (src_any && dst_match) ||
1439 (src_any && dst_any))
23691d75 1440 c1 = c;
b62f328b
VT		 1441 }
1442 }
280f294f 1443
23691d75 1444 read_unlock(&chan_list_lock);
b62f328b 1445
23691d75 1446 return c1;
b62f328b
VT		 1447}
1448
1449static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1450{
cc8dba2b 1451 struct hci_conn *hcon = conn->hcon;
23691d75 1452 struct l2cap_chan *chan, *pchan;
cc8dba2b 1453 u8 dst_type;
b62f328b
VT		 1454
1455 BT_DBG("");
1456
18722c24
JR		 1457 bt_6lowpan_add_conn(conn);
1458
b62f328b 1459 /* Check if we have socket listening on cid */
073d1cf3 1460 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
cc8dba2b 1461 &hcon->src, &hcon->dst);
23691d75 1462 if (!pchan)
b62f328b
VT		 1463 return;
1464
44f3b0fb
JH		 1465 /* Client ATT sockets should override the server one */
1466 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1467 return;
1468
cc8dba2b
MH		 1469 dst_type = bdaddr_type(hcon, hcon->dst_type);
1470
1471 /* If device is blocked, do not create a channel for it */
1472 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type))
1473 return;
1474
8ffb9290 1475 l2cap_chan_lock(pchan);
62f3a2cf 1476
80b98027 1477 chan = pchan->ops->new_connection(pchan);
80808e43 1478 if (!chan)
b62f328b
VT		 1479 goto clean;
1480
cc8dba2b
MH		 1481 bacpy(&chan->src, &hcon->src);
1482 bacpy(&chan->dst, &hcon->dst);
1483 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1484 chan->dst_type = dst_type;
b62f328b 1485
44f3b0fb 1486 __l2cap_chan_add(conn, chan);
48454079 1487
b62f328b 1488clean:
8ffb9290 1489 l2cap_chan_unlock(pchan);
b62f328b
VT		 1490}
1491
4e8402a3
MH		 1492static void l2cap_conn_ready(struct l2cap_conn *conn)
1493{
48454079 1494 struct l2cap_chan *chan;
cc110922 1495 struct hci_conn *hcon = conn->hcon;
4e8402a3 1496
79d554a6 1497 BT_DBG("conn %p", conn);
4e8402a3 1498
d8729922
JH		 1499 /* For outgoing pairing which doesn't necessarily have an
1500 * associated socket (e.g. mgmt_pair_device).
1501 */
cc110922
VCG		 1502 if (hcon->out && hcon->type == LE_LINK)
1503 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1504
3df91ea2 1505 mutex_lock(&conn->chan_lock);
4e8402a3 1506
44f3b0fb
JH		 1507 if (hcon->type == LE_LINK)
1508 l2cap_le_conn_ready(conn);
1509
3df91ea2 1510 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1511
6be36555 1512 l2cap_chan_lock(chan);
4e8402a3 1513
2338a7e0 1514 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1515 l2cap_chan_unlock(chan);
1516 continue;
1517 }
1518
cc110922 1519 if (hcon->type == LE_LINK) {
f1496dee 1520 l2cap_le_start(chan);
63128451 1521 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
74e75740 1522 l2cap_chan_ready(chan);
b501d6a1 1523
1c244f79 1524 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1525 l2cap_do_start(chan);
1c244f79 1526 }
4e8402a3 1527
6be36555 1528 l2cap_chan_unlock(chan);
4e8402a3 1529 }
79d554a6 1530
3df91ea2 1531 mutex_unlock(&conn->chan_lock);
61a939c6
JH		 1532
1533 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1534}
1535
1536/* Notify sockets that we cannot guaranty reliability anymore */
1537static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1538{
48454079 1539 struct l2cap_chan *chan;
4e8402a3
MH		 1540
1541 BT_DBG("conn %p", conn);
1542
3df91ea2 1543 mutex_lock(&conn->chan_lock);
4e8402a3 1544
3df91ea2 1545 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1546 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1547 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1548 }
1549
3df91ea2 1550 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1551}
1552
f878fcad 1553static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1554{
f878fcad 1555 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1556 info_timer.work);
4e8402a3 1557
984947dc 1558 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1559 conn->info_ident = 0;
984947dc 1560
4e8402a3
MH		 1561 l2cap_conn_start(conn);
1562}
1563
2c8e1411
DH		 1564/*
1565 * l2cap_user
1566 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1567 * callback is called during registration. The ->remove callback is called
1568 * during unregistration.
1569 * An l2cap_user object can either be explicitly unregistered or when the
1570 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1571 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1572 * External modules must own a reference to the l2cap_conn object if they intend
1573 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1574 * any time if they don't.
1575 */
1576
1577int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1578{
1579 struct hci_dev *hdev = conn->hcon->hdev;
1580 int ret;
1581
1582 /* We need to check whether l2cap_conn is registered. If it is not, we
1583 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1584 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1585 * relies on the parent hci_conn object to be locked. This itself relies
1586 * on the hci_dev object to be locked. So we must lock the hci device
1587 * here, too. */
1588
1589 hci_dev_lock(hdev);
1590
1591 if (user->list.next || user->list.prev) {
1592 ret = -EINVAL;
1593 goto out_unlock;
1594 }
1595
1596 /* conn->hchan is NULL after l2cap_conn_del() was called */
1597 if (!conn->hchan) {
1598 ret = -ENODEV;
1599 goto out_unlock;
1600 }
1601
1602 ret = user->probe(conn, user);
1603 if (ret)
1604 goto out_unlock;
1605
1606 list_add(&user->list, &conn->users);
1607 ret = 0;
1608
1609out_unlock:
1610 hci_dev_unlock(hdev);
1611 return ret;
1612}
1613EXPORT_SYMBOL(l2cap_register_user);
1614
1615void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1616{
1617 struct hci_dev *hdev = conn->hcon->hdev;
1618
1619 hci_dev_lock(hdev);
1620
1621 if (!user->list.next || !user->list.prev)
1622 goto out_unlock;
1623
1624 list_del(&user->list);
1625 user->list.next = NULL;
1626 user->list.prev = NULL;
1627 user->remove(conn, user);
1628
1629out_unlock:
1630 hci_dev_unlock(hdev);
1631}
1632EXPORT_SYMBOL(l2cap_unregister_user);
1633
1634static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1635{
1636 struct l2cap_user *user;
1637
1638 while (!list_empty(&conn->users)) {
1639 user = list_first_entry(&conn->users, struct l2cap_user, list);
1640 list_del(&user->list);
1641 user->list.next = NULL;
1642 user->list.prev = NULL;
1643 user->remove(conn, user);
1644 }
1645}
1646
5d3de7df
VCG		 1647static void l2cap_conn_del(struct hci_conn *hcon, int err)
1648{
1649 struct l2cap_conn *conn = hcon->l2cap_data;
1650 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1651
1652 if (!conn)
1653 return;
1654
1655 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1656
1657 kfree_skb(conn->rx_skb);
1658
61a939c6
JH		 1659 skb_queue_purge(&conn->pending_rx);
1660 flush_work(&conn->pending_rx_work);
1661
2c8e1411
DH		 1662 l2cap_unregister_all_users(conn);
1663
3df91ea2
AE		 1664 mutex_lock(&conn->chan_lock);
1665
5d3de7df
VCG		 1666 /* Kill channels */
1667 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1668 l2cap_chan_hold(chan);
6be36555
AE		 1669 l2cap_chan_lock(chan);
1670
5d3de7df 1671 l2cap_chan_del(chan, err);
6be36555
AE		 1672
1673 l2cap_chan_unlock(chan);
1674
80b98027 1675 chan->ops->close(chan);
61d6ef3e 1676 l2cap_chan_put(chan);
5d3de7df
VCG		 1677 }
1678
3df91ea2
AE		 1679 mutex_unlock(&conn->chan_lock);
1680
73d80deb
LAD		 1681 hci_chan_del(conn->hchan);
1682
5d3de7df 1683 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1684 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1685
51a8efd7 1686 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1687 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1688 smp_chan_destroy(conn);
d26a2345 1689 }
5d3de7df
VCG		 1690
1691 hcon->l2cap_data = NULL;
9c903e37
DH		 1692 conn->hchan = NULL;
1693 l2cap_conn_put(conn);
5d3de7df
VCG		 1694}
1695
6c9d42a1 1696static void security_timeout(struct work_struct *work)
5d3de7df 1697{
6c9d42a1 1698 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1699 security_timer.work);
5d3de7df 1700
d06cc416
JH		 1701 BT_DBG("conn %p", conn);
1702
1703 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1704 smp_chan_destroy(conn);
1705 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1706 }
5d3de7df
VCG		 1707}
1708
9c903e37
DH		 1709static void l2cap_conn_free(struct kref *ref)
1710{
1711 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1712
1713 hci_conn_put(conn->hcon);
1714 kfree(conn);
1715}
1716
1717void l2cap_conn_get(struct l2cap_conn *conn)
1718{
1719 kref_get(&conn->ref);
1720}
1721EXPORT_SYMBOL(l2cap_conn_get);
1722
1723void l2cap_conn_put(struct l2cap_conn *conn)
1724{
1725 kref_put(&conn->ref, l2cap_conn_free);
1726}
1727EXPORT_SYMBOL(l2cap_conn_put);
1728
1da177e4 1729/* ---- Socket interface ---- */
1da177e4 1730
c2287681 1731/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1732 * Returns closest match.
1733 */
c2287681
IY		 1734static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1735 bdaddr_t *src,
bf20fd4e
JH		 1736 bdaddr_t *dst,
1737 u8 link_type)
1da177e4 1738{
23691d75 1739 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1740
23691d75 1741 read_lock(&chan_list_lock);
e0f0cb56 1742
23691d75 1743 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1744 if (state && c->state != state)
1da177e4
LT		 1745 continue;
1746
bf20fd4e
JH		 1747 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1748 continue;
1749
1750 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1751 continue;
1752
23691d75 1753 if (c->psm == psm) {
c2287681
IY		 1754 int src_match, dst_match;
1755 int src_any, dst_any;
1756
1da177e4 1757 /* Exact match. */
7eafc59e
MH		 1758 src_match = !bacmp(&c->src, src);
1759 dst_match = !bacmp(&c->dst, dst);
c2287681 1760 if (src_match && dst_match) {
a7567b20 1761 read_unlock(&chan_list_lock);
23691d75
GP		 1762 return c;
1763 }
1da177e4
LT		 1764
1765 /* Closest match */
7eafc59e
MH		 1766 src_any = !bacmp(&c->src, BDADDR_ANY);
1767 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1768 if ((src_match && dst_any) || (src_any && dst_match) ||
1769 (src_any && dst_any))
23691d75 1770 c1 = c;
1da177e4
LT		 1771 }
1772 }
1da177e4 1773
23691d75 1774 read_unlock(&chan_list_lock);
e0f0cb56 1775
23691d75 1776 return c1;
1da177e4
LT		 1777}
1778
721c4181 1779static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1780{
721c4181 1781 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1782 monitor_timer.work);
e90bac06 1783
525cd185 1784 BT_DBG("chan %p", chan);
0e98958d 1785
6be36555
AE		 1786 l2cap_chan_lock(chan);
1787
80909e04 1788 if (!chan->conn) {
6be36555 1789 l2cap_chan_unlock(chan);
8d7e1c7f 1790 l2cap_chan_put(chan);
e90bac06
GP		 1791 return;
1792 }
1793
401bb1f7 1794 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1795
6be36555 1796 l2cap_chan_unlock(chan);
8d7e1c7f 1797 l2cap_chan_put(chan);
e90bac06
GP		 1798}
1799
721c4181 1800static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1801{
721c4181 1802 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1803 retrans_timer.work);
e90bac06 1804
49208c9c 1805 BT_DBG("chan %p", chan);
0e98958d 1806
6be36555
AE		 1807 l2cap_chan_lock(chan);
1808
80909e04
MM		 1809 if (!chan->conn) {
1810 l2cap_chan_unlock(chan);
1811 l2cap_chan_put(chan);
1812 return;
1813 }
6be36555 1814
401bb1f7 1815 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1816 l2cap_chan_unlock(chan);
8d7e1c7f 1817 l2cap_chan_put(chan);
e90bac06
GP		 1818}
1819
d660366d
GP		 1820static void l2cap_streaming_send(struct l2cap_chan *chan,
1821 struct sk_buff_head *skbs)
6840ed07 1822{
ccbb84af 1823 struct sk_buff *skb;
3733937d 1824 struct l2cap_ctrl *control;
6840ed07 1825
3733937d
MM		 1826 BT_DBG("chan %p, skbs %p", chan, skbs);
1827
b99e13ad
MM		 1828 if (__chan_is_moving(chan))
1829 return;
1830
3733937d
MM		 1831 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1832
1833 while (!skb_queue_empty(&chan->tx_q)) {
1834
1835 skb = skb_dequeue(&chan->tx_q);
1836
1837 bt_cb(skb)->control.retries = 1;
1838 control = &bt_cb(skb)->control;
1839
1840 control->reqseq = 0;
1841 control->txseq = chan->next_tx_seq;
1842
1843 __pack_control(chan, control, skb);
6840ed07 1844
47d1ec61 1845 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1846 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1847 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1848 }
1849
4343478f 1850 l2cap_do_send(chan, skb);
6840ed07 1851
b4400672 1852 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1853
836be934 1854 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1855 chan->frames_sent++;
6840ed07 1856 }
6840ed07
GP		 1857}
1858
67c9e840 1859static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1860{
1861 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1862 struct l2cap_ctrl *control;
1863 int sent = 0;
1864
1865 BT_DBG("chan %p", chan);
1c2acffb 1866
89bc500e 1867 if (chan->state != BT_CONNECTED)
c13ffa62 1868 return -ENOTCONN;
e90bac06 1869
94122bbe
MM		 1870 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1871 return 0;
1872
b99e13ad
MM		 1873 if (__chan_is_moving(chan))
1874 return 0;
1875
18a48e76
MM		 1876 while (chan->tx_send_head &&
1877 chan->unacked_frames < chan->remote_tx_win &&
1878 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1879
18a48e76 1880 skb = chan->tx_send_head;
e90bac06 1881
18a48e76
MM		 1882 bt_cb(skb)->control.retries = 1;
1883 control = &bt_cb(skb)->control;
95ffa978 1884
e2ab4353 1885 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1886 control->final = 1;
e2ab4353 1887
18a48e76
MM		 1888 control->reqseq = chan->buffer_seq;
1889 chan->last_acked_seq = chan->buffer_seq;
1890 control->txseq = chan->next_tx_seq;
1c2acffb 1891
18a48e76 1892 __pack_control(chan, control, skb);
e90bac06 1893
47d1ec61 1894 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1895 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1896 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1897 }
1898
18a48e76
MM		 1899 /* Clone after data has been modified. Data is assumed to be
1900 read-only (for locking purposes) on cloned sk_buffs.
1901 */
1902 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1903
18a48e76
MM		 1904 if (!tx_skb)
1905 break;
1c2acffb 1906
18a48e76 1907 __set_retrans_timer(chan);
836be934
AE		 1908
1909 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1910 chan->unacked_frames++;
6a026610 1911 chan->frames_sent++;
18a48e76 1912 sent++;
1c2acffb 1913
58d35f87
GP		 1914 if (skb_queue_is_last(&chan->tx_q, skb))
1915 chan->tx_send_head = NULL;
1c2acffb 1916 else
58d35f87 1917 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1918
1919 l2cap_do_send(chan, tx_skb);
b4400672 1920 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1921 }
1922
b4400672
AE		 1923 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1924 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1925
1926 return sent;
9e917af1
GP		 1927}
1928
e1fbd4c1
MM		 1929static void l2cap_ertm_resend(struct l2cap_chan *chan)
1930{
1931 struct l2cap_ctrl control;
1932 struct sk_buff *skb;
1933 struct sk_buff *tx_skb;
1934 u16 seq;
1935
1936 BT_DBG("chan %p", chan);
1937
1938 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1939 return;
1940
b99e13ad
MM		 1941 if (__chan_is_moving(chan))
1942 return;
1943
e1fbd4c1
MM		 1944 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1945 seq = l2cap_seq_list_pop(&chan->retrans_list);
1946
1947 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1948 if (!skb) {
1949 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1950 seq);
e1fbd4c1
MM		 1951 continue;
1952 }
1953
1954 bt_cb(skb)->control.retries++;
1955 control = bt_cb(skb)->control;
1956
1957 if (chan->max_tx != 0 &&
1958 bt_cb(skb)->control.retries > chan->max_tx) {
1959 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1960 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1961 l2cap_seq_list_clear(&chan->retrans_list);
1962 break;
1963 }
1964
1965 control.reqseq = chan->buffer_seq;
1966 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1967 control.final = 1;
1968 else
1969 control.final = 0;
1970
1971 if (skb_cloned(skb)) {
1972 /* Cloned sk_buffs are read-only, so we need a
1973 * writeable copy
1974 */
8bcde1f2 1975 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1976 } else {
8bcde1f2 1977 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1978 }
1979
1980 if (!tx_skb) {
1981 l2cap_seq_list_clear(&chan->retrans_list);
1982 break;
1983 }
1984
1985 /* Update skb contents */
1986 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1987 put_unaligned_le32(__pack_extended_control(&control),
1988 tx_skb->data + L2CAP_HDR_SIZE);
1989 } else {
1990 put_unaligned_le16(__pack_enhanced_control(&control),
1991 tx_skb->data + L2CAP_HDR_SIZE);
1992 }
1993
1994 if (chan->fcs == L2CAP_FCS_CRC16) {
1995 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
1996 put_unaligned_le16(fcs, skb_put(tx_skb,
1997 L2CAP_FCS_SIZE));
1998 }
1999
2000 l2cap_do_send(chan, tx_skb);
2001
2002 BT_DBG("Resent txseq %d", control.txseq);
2003
2004 chan->last_acked_seq = chan->buffer_seq;
2005 }
2006}
2007
f80842a8
MM		 2008static void l2cap_retransmit(struct l2cap_chan *chan,
2009 struct l2cap_ctrl *control)
2010{
2011 BT_DBG("chan %p, control %p", chan, control);
2012
2013 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2014 l2cap_ertm_resend(chan);
2015}
2016
d2a7ac5d
MM		 2017static void l2cap_retransmit_all(struct l2cap_chan *chan,
2018 struct l2cap_ctrl *control)
2019{
e1fbd4c1
MM		 2020 struct sk_buff *skb;
2021
2022 BT_DBG("chan %p, control %p", chan, control);
2023
2024 if (control->poll)
2025 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2026
2027 l2cap_seq_list_clear(&chan->retrans_list);
2028
2029 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2030 return;
2031
2032 if (chan->unacked_frames) {
2033 skb_queue_walk(&chan->tx_q, skb) {
2034 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2035 skb == chan->tx_send_head)
e1fbd4c1
MM		 2036 break;
2037 }
2038
2039 skb_queue_walk_from(&chan->tx_q, skb) {
2040 if (skb == chan->tx_send_head)
2041 break;
2042
2043 l2cap_seq_list_append(&chan->retrans_list,
2044 bt_cb(skb)->control.txseq);
2045 }
2046
2047 l2cap_ertm_resend(chan);
2048 }
d2a7ac5d
MM		 2049}
2050
0a0aba42 2051static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2052{
0a0aba42
MM		 2053 struct l2cap_ctrl control;
2054 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2055 chan->last_acked_seq);
2056 int threshold;
9e917af1 2057
0a0aba42
MM		 2058 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2059 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2060
0a0aba42
MM		 2061 memset(&control, 0, sizeof(control));
2062 control.sframe = 1;
dfc909be 2063
0a0aba42
MM		 2064 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2065 chan->rx_state == L2CAP_RX_STATE_RECV) {
2066 __clear_ack_timer(chan);
2067 control.super = L2CAP_SUPER_RNR;
2068 control.reqseq = chan->buffer_seq;
2069 l2cap_send_sframe(chan, &control);
2070 } else {
2071 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2072 l2cap_ertm_send(chan);
2073 /* If any i-frames were sent, they included an ack */
2074 if (chan->buffer_seq == chan->last_acked_seq)
2075 frames_to_ack = 0;
2076 }
dfc909be 2077
c20f8e35 2078 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2079 * Calculate without mul or div
2080 */
c20f8e35 2081 threshold = chan->ack_win;
0a0aba42
MM		 2082 threshold += threshold << 1;
2083 threshold >>= 2;
2084
b4400672 2085 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2086 threshold);
2087
2088 if (frames_to_ack >= threshold) {
2089 __clear_ack_timer(chan);
2090 control.super = L2CAP_SUPER_RR;
2091 control.reqseq = chan->buffer_seq;
2092 l2cap_send_sframe(chan, &control);
2093 frames_to_ack = 0;
2094 }
1c2acffb 2095
0a0aba42
MM		 2096 if (frames_to_ack)
2097 __set_ack_timer(chan);
2098 }
b17e73bb
SJ		 2099}
2100
04124681
GP		 2101static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2102 struct msghdr *msg, int len,
2103 int count, struct sk_buff *skb)
1c2acffb 2104{
0952a57a 2105 struct l2cap_conn *conn = chan->conn;
1c2acffb 2106 struct sk_buff **frag;
90338947 2107 int sent = 0;
1da177e4 2108
59203a21 2109 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2110 return -EFAULT;
1da177e4
LT		 2111
2112 sent += count;
2113 len -= count;
2114
2115 /* Continuation fragments (no L2CAP header) */
2116 frag = &skb_shinfo(skb)->frag_list;
2117 while (len) {
fbe00700
GP		 2118 struct sk_buff *tmp;
2119
1da177e4
LT		 2120 count = min_t(unsigned int, conn->mtu, len);
2121
fbe00700
GP		 2122 tmp = chan->ops->alloc_skb(chan, count,
2123 msg->msg_flags & MSG_DONTWAIT);
2124 if (IS_ERR(tmp))
2125 return PTR_ERR(tmp);
2126
2127 *frag = tmp;
2f7719ce 2128
1c2acffb
GP		 2129 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2130 return -EFAULT;
1da177e4 2131
5e59b791
LAD		 2132 (*frag)->priority = skb->priority;
2133
1da177e4
LT		 2134 sent += count;
2135 len -= count;
2136
2d0ed3d5
GP		 2137 skb->len += (*frag)->len;
2138 skb->data_len += (*frag)->len;
2139
1da177e4
LT		 2140 frag = &(*frag)->next;
2141 }
1da177e4
LT		 2142
2143 return sent;
1c2acffb 2144}
1da177e4 2145
5e59b791 2146static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2147 struct msghdr *msg, size_t len,
2148 u32 priority)
1c2acffb 2149{
8c1d787b 2150 struct l2cap_conn *conn = chan->conn;
1c2acffb 2151 struct sk_buff *skb;
03a51213 2152 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2153 struct l2cap_hdr *lh;
2154
43b1b8df
MH		 2155 BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan,
2156 __le16_to_cpu(chan->psm), len, priority);
1c2acffb
GP		 2157
2158 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2159
2160 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2161 msg->msg_flags & MSG_DONTWAIT);
2162 if (IS_ERR(skb))
2163 return skb;
1c2acffb 2164
5e59b791
LAD		 2165 skb->priority = priority;
2166
1c2acffb
GP		 2167 /* Create L2CAP header */
2168 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2169 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2170 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2171 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2172
0952a57a 2173 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2174 if (unlikely(err < 0)) {
2175 kfree_skb(skb);
2176 return ERR_PTR(err);
2177 }
2178 return skb;
2179}
2180
5e59b791 2181static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2182 struct msghdr *msg, size_t len,
2183 u32 priority)
1c2acffb 2184{
8c1d787b 2185 struct l2cap_conn *conn = chan->conn;
1c2acffb 2186 struct sk_buff *skb;
f2ba7fae 2187 int err, count;
1c2acffb
GP		 2188 struct l2cap_hdr *lh;
2189
b4400672 2190 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2191
f2ba7fae 2192 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2193
f2ba7fae 2194 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2195 msg->msg_flags & MSG_DONTWAIT);
2196 if (IS_ERR(skb))
2197 return skb;
1c2acffb 2198
5e59b791
LAD		 2199 skb->priority = priority;
2200
1c2acffb
GP		 2201 /* Create L2CAP header */
2202 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2203 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2204 lh->len = cpu_to_le16(len);
1c2acffb 2205
0952a57a 2206 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2207 if (unlikely(err < 0)) {
2208 kfree_skb(skb);
2209 return ERR_PTR(err);
2210 }
2211 return skb;
2212}
2213
ab0ff76d 2214static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2215 struct msghdr *msg, size_t len,
2216 u16 sdulen)
1c2acffb 2217{
8c1d787b 2218 struct l2cap_conn *conn = chan->conn;
1c2acffb 2219 struct sk_buff *skb;
e4ca6d98 2220 int err, count, hlen;
1c2acffb
GP		 2221 struct l2cap_hdr *lh;
2222
b4400672 2223 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2224
0ee0d208
GP		 2225 if (!conn)
2226 return ERR_PTR(-ENOTCONN);
2227
ba7aa64f 2228 hlen = __ertm_hdr_size(chan);
e4ca6d98 2229
c74e560c 2230 if (sdulen)
03a51213 2231 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2232
47d1ec61 2233 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2234 hlen += L2CAP_FCS_SIZE;
fcc203c3 2235
1c2acffb 2236 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2237
2238 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2239 msg->msg_flags & MSG_DONTWAIT);
2240 if (IS_ERR(skb))
2241 return skb;
1c2acffb
GP		 2242
2243 /* Create L2CAP header */
2244 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2245 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2246 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2247
18a48e76
MM		 2248 /* Control header is populated later */
2249 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2250 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2251 else
2252 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2253
c74e560c 2254 if (sdulen)
03a51213 2255 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2256
0952a57a 2257 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2258 if (unlikely(err < 0)) {
2259 kfree_skb(skb);
2260 return ERR_PTR(err);
2261 }
e90bac06 2262
18a48e76 2263 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2264 bt_cb(skb)->control.retries = 0;
1c2acffb 2265 return skb;
1da177e4
LT		 2266}
2267
94122bbe
MM		 2268static int l2cap_segment_sdu(struct l2cap_chan *chan,
2269 struct sk_buff_head *seg_queue,
2270 struct msghdr *msg, size_t len)
c74e560c 2271{
c74e560c 2272 struct sk_buff *skb;
94122bbe
MM		 2273 u16 sdu_len;
2274 size_t pdu_len;
94122bbe 2275 u8 sar;
c74e560c 2276
b4400672 2277 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2278
94122bbe
MM		 2279 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2280 * so fragmented skbs are not used. The HCI layer's handling
2281 * of fragmented skbs is not compatible with ERTM's queueing.
2282 */
c74e560c 2283
94122bbe
MM		 2284 /* PDU size is derived from the HCI MTU */
2285 pdu_len = chan->conn->mtu;
c74e560c 2286
a549574d
MM		 2287 /* Constrain PDU size for BR/EDR connections */
2288 if (!chan->hs_hcon)
2289 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2290
2291 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2292 if (chan->fcs)
2293 pdu_len -= L2CAP_FCS_SIZE;
2294
ba7aa64f 2295 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2296
2297 /* Remote device may have requested smaller PDUs */
2298 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2299
2300 if (len <= pdu_len) {
2301 sar = L2CAP_SAR_UNSEGMENTED;
2302 sdu_len = 0;
2303 pdu_len = len;
2304 } else {
2305 sar = L2CAP_SAR_START;
2306 sdu_len = len;
2307 pdu_len -= L2CAP_SDULEN_SIZE;
2308 }
2309
2310 while (len > 0) {
2311 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2312
c74e560c 2313 if (IS_ERR(skb)) {
94122bbe 2314 __skb_queue_purge(seg_queue);
c74e560c
GP		 2315 return PTR_ERR(skb);
2316 }
2317
94122bbe
MM		 2318 bt_cb(skb)->control.sar = sar;
2319 __skb_queue_tail(seg_queue, skb);
2320
2321 len -= pdu_len;
2322 if (sdu_len) {
2323 sdu_len = 0;
2324 pdu_len += L2CAP_SDULEN_SIZE;
2325 }
2326
2327 if (len <= pdu_len) {
2328 sar = L2CAP_SAR_END;
2329 pdu_len = len;
2330 } else {
2331 sar = L2CAP_SAR_CONTINUE;
2332 }
c74e560c 2333 }
c74e560c 2334
f0f62799 2335 return 0;
c74e560c
GP		 2336}
2337
177f8f2b
JH		 2338static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2339 struct msghdr *msg,
2340 size_t len, u16 sdulen)
2341{
2342 struct l2cap_conn *conn = chan->conn;
2343 struct sk_buff *skb;
2344 int err, count, hlen;
2345 struct l2cap_hdr *lh;
2346
2347 BT_DBG("chan %p len %zu", chan, len);
2348
2349 if (!conn)
2350 return ERR_PTR(-ENOTCONN);
2351
2352 hlen = L2CAP_HDR_SIZE;
2353
2354 if (sdulen)
2355 hlen += L2CAP_SDULEN_SIZE;
2356
2357 count = min_t(unsigned int, (conn->mtu - hlen), len);
2358
2359 skb = chan->ops->alloc_skb(chan, count + hlen,
2360 msg->msg_flags & MSG_DONTWAIT);
2361 if (IS_ERR(skb))
2362 return skb;
2363
2364 /* Create L2CAP header */
2365 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2366 lh->cid = cpu_to_le16(chan->dcid);
2367 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2368
2369 if (sdulen)
2370 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2371
2372 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2373 if (unlikely(err < 0)) {
2374 kfree_skb(skb);
2375 return ERR_PTR(err);
2376 }
2377
2378 return skb;
2379}
2380
2381static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2382 struct sk_buff_head *seg_queue,
2383 struct msghdr *msg, size_t len)
2384{
2385 struct sk_buff *skb;
2386 size_t pdu_len;
2387 u16 sdu_len;
2388
2389 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2390
2391 pdu_len = chan->conn->mtu - L2CAP_HDR_SIZE;
2392
2393 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2394
2395 sdu_len = len;
2396 pdu_len -= L2CAP_SDULEN_SIZE;
2397
2398 while (len > 0) {
2399 if (len <= pdu_len)
2400 pdu_len = len;
2401
2402 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2403 if (IS_ERR(skb)) {
2404 __skb_queue_purge(seg_queue);
2405 return PTR_ERR(skb);
2406 }
2407
2408 __skb_queue_tail(seg_queue, skb);
2409
2410 len -= pdu_len;
2411
2412 if (sdu_len) {
2413 sdu_len = 0;
2414 pdu_len += L2CAP_SDULEN_SIZE;
2415 }
2416 }
2417
2418 return 0;
2419}
2420
5e59b791 2421int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2422 u32 priority)
9a91a04a 2423{
9a91a04a 2424 struct sk_buff *skb;
9a91a04a 2425 int err;
94122bbe 2426 struct sk_buff_head seg_queue;
9a91a04a 2427
31e8ce80
SWK		 2428 if (!chan->conn)
2429 return -ENOTCONN;
2430
9a91a04a 2431 /* Connectionless channel */
715ec005 2432 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2433 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2434 if (IS_ERR(skb))
2435 return PTR_ERR(skb);
2436
ede81a2a
AK		 2437 /* Channel lock is released before requesting new skb and then
2438 * reacquired thus we need to recheck channel state.
2439 */
2440 if (chan->state != BT_CONNECTED) {
2441 kfree_skb(skb);
2442 return -ENOTCONN;
2443 }
2444
9a91a04a
GP		 2445 l2cap_do_send(chan, skb);
2446 return len;
2447 }
2448
2449 switch (chan->mode) {
38319713 2450 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2451 /* Check outgoing MTU */
2452 if (len > chan->omtu)
2453 return -EMSGSIZE;
2454
fad5fc89
JH		 2455 if (!chan->tx_credits)
2456 return -EAGAIN;
2457
177f8f2b
JH		 2458 __skb_queue_head_init(&seg_queue);
2459
2460 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2461
2462 if (chan->state != BT_CONNECTED) {
2463 __skb_queue_purge(&seg_queue);
2464 err = -ENOTCONN;
2465 }
2466
2467 if (err)
2468 return err;
2469
2470 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2471
2472 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2473 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2474 chan->tx_credits--;
2475 }
2476
2477 if (!chan->tx_credits)
2478 chan->ops->suspend(chan);
2479
2480 err = len;
2481
2482 break;
2483
fad5fc89 2484 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2485 /* Check outgoing MTU */
2486 if (len > chan->omtu)
2487 return -EMSGSIZE;
2488
2489 /* Create a basic PDU */
5e59b791 2490 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2491 if (IS_ERR(skb))
2492 return PTR_ERR(skb);
2493
ede81a2a
AK		 2494 /* Channel lock is released before requesting new skb and then
2495 * reacquired thus we need to recheck channel state.
2496 */
2497 if (chan->state != BT_CONNECTED) {
2498 kfree_skb(skb);
2499 return -ENOTCONN;
2500 }
2501
9a91a04a
GP		 2502 l2cap_do_send(chan, skb);
2503 err = len;
2504 break;
2505
2506 case L2CAP_MODE_ERTM:
2507 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2508 /* Check outgoing MTU */
2509 if (len > chan->omtu) {
2510 err = -EMSGSIZE;
2511 break;
2512 }
9a91a04a 2513
94122bbe 2514 __skb_queue_head_init(&seg_queue);
9a91a04a 2515
94122bbe
MM		 2516 /* Do segmentation before calling in to the state machine,
2517 * since it's possible to block while waiting for memory
2518 * allocation.
2519 */
2520 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2521
94122bbe
MM		 2522 /* The channel could have been closed while segmenting,
2523 * check that it is still connected.
2524 */
2525 if (chan->state != BT_CONNECTED) {
2526 __skb_queue_purge(&seg_queue);
2527 err = -ENOTCONN;
9a91a04a
GP		 2528 }
2529
94122bbe 2530 if (err)
9a91a04a 2531 break;
9a91a04a 2532
3733937d 2533 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2534 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2535 else
d660366d 2536 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2537
d660366d 2538 err = len;
9a91a04a 2539
94122bbe
MM		 2540 /* If the skbs were not queued for sending, they'll still be in
2541 * seg_queue and need to be purged.
2542 */
2543 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2544 break;
2545
2546 default:
2547 BT_DBG("bad state %1.1x", chan->mode);
2548 err = -EBADFD;
2549 }
2550
2551 return err;
2552}
2553
d2a7ac5d
MM		 2554static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2555{
bed68bde
MM		 2556 struct l2cap_ctrl control;
2557 u16 seq;
2558
b4400672 2559 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2560
2561 memset(&control, 0, sizeof(control));
2562 control.sframe = 1;
2563 control.super = L2CAP_SUPER_SREJ;
2564
2565 for (seq = chan->expected_tx_seq; seq != txseq;
2566 seq = __next_seq(chan, seq)) {
2567 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2568 control.reqseq = seq;
2569 l2cap_send_sframe(chan, &control);
2570 l2cap_seq_list_append(&chan->srej_list, seq);
2571 }
2572 }
2573
2574 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2575}
2576
2577static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2578{
bed68bde
MM		 2579 struct l2cap_ctrl control;
2580
2581 BT_DBG("chan %p", chan);
2582
2583 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2584 return;
2585
2586 memset(&control, 0, sizeof(control));
2587 control.sframe = 1;
2588 control.super = L2CAP_SUPER_SREJ;
2589 control.reqseq = chan->srej_list.tail;
2590 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2591}
2592
2593static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2594{
bed68bde
MM		 2595 struct l2cap_ctrl control;
2596 u16 initial_head;
2597 u16 seq;
2598
b4400672 2599 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2600
2601 memset(&control, 0, sizeof(control));
2602 control.sframe = 1;
2603 control.super = L2CAP_SUPER_SREJ;
2604
2605 /* Capture initial list head to allow only one pass through the list. */
2606 initial_head = chan->srej_list.head;
2607
2608 do {
2609 seq = l2cap_seq_list_pop(&chan->srej_list);
2610 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2611 break;
2612
2613 control.reqseq = seq;
2614 l2cap_send_sframe(chan, &control);
2615 l2cap_seq_list_append(&chan->srej_list, seq);
2616 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2617}
2618
608bcc6d
MM		 2619static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2620{
2621 struct sk_buff *acked_skb;
2622 u16 ackseq;
2623
b4400672 2624 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2625
2626 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2627 return;
2628
b4400672 2629 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2630 chan->expected_ack_seq, chan->unacked_frames);
2631
2632 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2633 ackseq = __next_seq(chan, ackseq)) {
2634
2635 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2636 if (acked_skb) {
2637 skb_unlink(acked_skb, &chan->tx_q);
2638 kfree_skb(acked_skb);
2639 chan->unacked_frames--;
2640 }
2641 }
2642
2643 chan->expected_ack_seq = reqseq;
2644
2645 if (chan->unacked_frames == 0)
2646 __clear_retrans_timer(chan);
2647
b4400672 2648 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2649}
2650
2651static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2652{
2653 BT_DBG("chan %p", chan);
2654
2655 chan->expected_tx_seq = chan->buffer_seq;
2656 l2cap_seq_list_clear(&chan->srej_list);
2657 skb_queue_purge(&chan->srej_q);
2658 chan->rx_state = L2CAP_RX_STATE_RECV;
2659}
2660
d660366d
GP		 2661static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2662 struct l2cap_ctrl *control,
2663 struct sk_buff_head *skbs, u8 event)
608bcc6d 2664{
608bcc6d
MM		 2665 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2666 event);
2667
2668 switch (event) {
2669 case L2CAP_EV_DATA_REQUEST:
2670 if (chan->tx_send_head == NULL)
2671 chan->tx_send_head = skb_peek(skbs);
2672
2673 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2674 l2cap_ertm_send(chan);
2675 break;
2676 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2677 BT_DBG("Enter LOCAL_BUSY");
2678 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2679
2680 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2681 /* The SREJ_SENT state must be aborted if we are to
2682 * enter the LOCAL_BUSY state.
2683 */
2684 l2cap_abort_rx_srej_sent(chan);
2685 }
2686
2687 l2cap_send_ack(chan);
2688
2689 break;
2690 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2691 BT_DBG("Exit LOCAL_BUSY");
2692 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2693
2694 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2695 struct l2cap_ctrl local_control;
2696
2697 memset(&local_control, 0, sizeof(local_control));
2698 local_control.sframe = 1;
2699 local_control.super = L2CAP_SUPER_RR;
2700 local_control.poll = 1;
2701 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2702 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2703
2704 chan->retry_count = 1;
2705 __set_monitor_timer(chan);
2706 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2707 }
2708 break;
2709 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2710 l2cap_process_reqseq(chan, control->reqseq);
2711 break;
2712 case L2CAP_EV_EXPLICIT_POLL:
2713 l2cap_send_rr_or_rnr(chan, 1);
2714 chan->retry_count = 1;
2715 __set_monitor_timer(chan);
2716 __clear_ack_timer(chan);
2717 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2718 break;
2719 case L2CAP_EV_RETRANS_TO:
2720 l2cap_send_rr_or_rnr(chan, 1);
2721 chan->retry_count = 1;
2722 __set_monitor_timer(chan);
2723 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2724 break;
2725 case L2CAP_EV_RECV_FBIT:
2726 /* Nothing to process */
2727 break;
2728 default:
2729 break;
2730 }
608bcc6d
MM		 2731}
2732
d660366d
GP		 2733static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2734 struct l2cap_ctrl *control,
2735 struct sk_buff_head *skbs, u8 event)
608bcc6d 2736{
608bcc6d
MM		 2737 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2738 event);
2739
2740 switch (event) {
2741 case L2CAP_EV_DATA_REQUEST:
2742 if (chan->tx_send_head == NULL)
2743 chan->tx_send_head = skb_peek(skbs);
2744 /* Queue data, but don't send. */
2745 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2746 break;
2747 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2748 BT_DBG("Enter LOCAL_BUSY");
2749 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2750
2751 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2752 /* The SREJ_SENT state must be aborted if we are to
2753 * enter the LOCAL_BUSY state.
2754 */
2755 l2cap_abort_rx_srej_sent(chan);
2756 }
2757
2758 l2cap_send_ack(chan);
2759
2760 break;
2761 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2762 BT_DBG("Exit LOCAL_BUSY");
2763 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2764
2765 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2766 struct l2cap_ctrl local_control;
2767 memset(&local_control, 0, sizeof(local_control));
2768 local_control.sframe = 1;
2769 local_control.super = L2CAP_SUPER_RR;
2770 local_control.poll = 1;
2771 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2772 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2773
2774 chan->retry_count = 1;
2775 __set_monitor_timer(chan);
2776 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2777 }
2778 break;
2779 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2780 l2cap_process_reqseq(chan, control->reqseq);
2781
2782 /* Fall through */
2783
2784 case L2CAP_EV_RECV_FBIT:
2785 if (control && control->final) {
2786 __clear_monitor_timer(chan);
2787 if (chan->unacked_frames > 0)
2788 __set_retrans_timer(chan);
2789 chan->retry_count = 0;
2790 chan->tx_state = L2CAP_TX_STATE_XMIT;
2791 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2792 }
2793 break;
2794 case L2CAP_EV_EXPLICIT_POLL:
2795 /* Ignore */
2796 break;
2797 case L2CAP_EV_MONITOR_TO:
2798 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2799 l2cap_send_rr_or_rnr(chan, 1);
2800 __set_monitor_timer(chan);
2801 chan->retry_count++;
2802 } else {
5e4e3972 2803 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2804 }
2805 break;
2806 default:
2807 break;
2808 }
608bcc6d
MM		 2809}
2810
d660366d
GP		 2811static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2812 struct sk_buff_head *skbs, u8 event)
608bcc6d 2813{
608bcc6d
MM		 2814 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2815 chan, control, skbs, event, chan->tx_state);
2816
2817 switch (chan->tx_state) {
2818 case L2CAP_TX_STATE_XMIT:
d660366d 2819 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2820 break;
2821 case L2CAP_TX_STATE_WAIT_F:
d660366d 2822 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2823 break;
2824 default:
2825 /* Ignore event */
2826 break;
2827 }
608bcc6d
MM		 2828}
2829
4b51dae9
MM		 2830static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2831 struct l2cap_ctrl *control)
2832{
2833 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2834 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2835}
2836
f80842a8
MM		 2837static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2838 struct l2cap_ctrl *control)
2839{
2840 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2841 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2842}
2843
1da177e4
LT		 2844/* Copy frame to all raw sockets on that connection */
2845static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2846{
1da177e4 2847 struct sk_buff *nskb;
48454079 2848 struct l2cap_chan *chan;
1da177e4
LT		 2849
2850 BT_DBG("conn %p", conn);
2851
3df91ea2 2852 mutex_lock(&conn->chan_lock);
3d57dc68 2853
3df91ea2 2854 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2855 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2856 continue;
2857
7f5396a7
GP		 2858 /* Don't send frame to the channel it came from */
2859 if (bt_cb(skb)->chan == chan)
1da177e4 2860 continue;
7f5396a7 2861
8bcde1f2 2862 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2863 if (!nskb)
1da177e4 2864 continue;
80b98027 2865 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2866 kfree_skb(nskb);
2867 }
3d57dc68 2868
3df91ea2 2869 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2870}
2871
2872/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2873static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2874 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2875{
2876 struct sk_buff *skb, **frag;
2877 struct l2cap_cmd_hdr *cmd;
2878 struct l2cap_hdr *lh;
2879 int len, count;
2880
b4400672
AE		 2881 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2882 conn, code, ident, dlen);
1da177e4 2883
300b962e
AL		 2884 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2885 return NULL;
2886
1da177e4
LT		 2887 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2888 count = min_t(unsigned int, conn->mtu, len);
2889
8bcde1f2 2890 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2891 if (!skb)
2892 return NULL;
2893
2894 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2895 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2896
2897 if (conn->hcon->type == LE_LINK)
ac73498c 2898 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2899 else
ac73498c 2900 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2901
2902 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2903 cmd->code = code;
2904 cmd->ident = ident;
aca3192c 2905 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2906
2907 if (dlen) {
2908 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2909 memcpy(skb_put(skb, count), data, count);
2910 data += count;
2911 }
2912
2913 len -= skb->len;
2914
2915 /* Continuation fragments (no L2CAP header) */
2916 frag = &skb_shinfo(skb)->frag_list;
2917 while (len) {
2918 count = min_t(unsigned int, conn->mtu, len);
2919
8bcde1f2 2920 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2921 if (!*frag)
2922 goto fail;
2923
2924 memcpy(skb_put(*frag, count), data, count);
2925
2926 len -= count;
2927 data += count;
2928
2929 frag = &(*frag)->next;
2930 }
2931
2932 return skb;
2933
2934fail:
2935 kfree_skb(skb);
2936 return NULL;
2937}
2938
2d792818
GP		 2939static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2940 unsigned long *val)
1da177e4
LT		 2941{
2942 struct l2cap_conf_opt *opt = *ptr;
2943 int len;
2944
2945 len = L2CAP_CONF_OPT_SIZE + opt->len;
2946 *ptr += len;
2947
2948 *type = opt->type;
2949 *olen = opt->len;
2950
2951 switch (opt->len) {
2952 case 1:
2953 *val = *((u8 *) opt->val);
2954 break;
2955
2956 case 2:
bfaaeb3e 2957 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2958 break;
2959
2960 case 4:
bfaaeb3e 2961 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2962 break;
2963
2964 default:
2965 *val = (unsigned long) opt->val;
2966 break;
2967 }
2968
b4400672 2969 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2970 return len;
2971}
2972
1da177e4
LT		 2973static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2974{
2975 struct l2cap_conf_opt *opt = *ptr;
2976
b4400672 2977 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2978
2979 opt->type = type;
2980 opt->len = len;
2981
2982 switch (len) {
2983 case 1:
2984 *((u8 *) opt->val) = val;
2985 break;
2986
2987 case 2:
4f8b691c 2988 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2989 break;
2990
2991 case 4:
4f8b691c 2992 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2993 break;
2994
2995 default:
2996 memcpy(opt->val, (void *) val, len);
2997 break;
2998 }
2999
3000 *ptr += L2CAP_CONF_OPT_SIZE + len;
3001}
3002
f89cef09
AE		 3003static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
3004{
3005 struct l2cap_conf_efs efs;
3006
1ec918ce 3007 switch (chan->mode) {
f89cef09
AE		 3008 case L2CAP_MODE_ERTM:
3009 efs.id = chan->local_id;
3010 efs.stype = chan->local_stype;
3011 efs.msdu = cpu_to_le16(chan->local_msdu);
3012 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 3013 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 3014 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3015 break;
3016
3017 case L2CAP_MODE_STREAMING:
3018 efs.id = 1;
3019 efs.stype = L2CAP_SERV_BESTEFFORT;
3020 efs.msdu = cpu_to_le16(chan->local_msdu);
3021 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3022 efs.acc_lat = 0;
3023 efs.flush_to = 0;
3024 break;
3025
3026 default:
3027 return;
3028 }
3029
3030 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3031 (unsigned long) &efs);
f89cef09
AE		 3032}
3033
721c4181 3034static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3035{
721c4181 3036 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3037 ack_timer.work);
3038 u16 frames_to_ack;
c1b4f43b 3039
2fb9b3d4
GP		 3040 BT_DBG("chan %p", chan);
3041
6be36555
AE		 3042 l2cap_chan_lock(chan);
3043
0362520b
MM		 3044 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3045 chan->last_acked_seq);
6be36555 3046
0362520b
MM		 3047 if (frames_to_ack)
3048 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3049
0362520b 3050 l2cap_chan_unlock(chan);
09bfb2ee 3051 l2cap_chan_put(chan);
c1b4f43b
GP		 3052}
3053
466f8004 3054int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3055{
3c588192
MM		 3056 int err;
3057
105bdf9e
MM		 3058 chan->next_tx_seq = 0;
3059 chan->expected_tx_seq = 0;
42e5c802 3060 chan->expected_ack_seq = 0;
6a026610 3061 chan->unacked_frames = 0;
42e5c802 3062 chan->buffer_seq = 0;
6a026610 3063 chan->frames_sent = 0;
105bdf9e
MM		 3064 chan->last_acked_seq = 0;
3065 chan->sdu = NULL;
3066 chan->sdu_last_frag = NULL;
3067 chan->sdu_len = 0;
3068
d34c34fb
MM		 3069 skb_queue_head_init(&chan->tx_q);
3070
6ed971ca
MH		 3071 chan->local_amp_id = AMP_ID_BREDR;
3072 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3073 chan->move_state = L2CAP_MOVE_STABLE;
3074 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3075
105bdf9e
MM		 3076 if (chan->mode != L2CAP_MODE_ERTM)
3077 return 0;
3078
3079 chan->rx_state = L2CAP_RX_STATE_RECV;
3080 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3081
721c4181
GP		 3082 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3083 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3084 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3085
f1c6775b 3086 skb_queue_head_init(&chan->srej_q);
1890d36b 3087
3c588192
MM		 3088 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3089 if (err < 0)
3090 return err;
3091
9dc9affc
MM		 3092 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3093 if (err < 0)
3094 l2cap_seq_list_free(&chan->srej_list);
3095
3096 return err;
0565c1c2
GP		 3097}
3098
f2fcfcd6
GP		 3099static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3100{
3101 switch (mode) {
3102 case L2CAP_MODE_STREAMING:
3103 case L2CAP_MODE_ERTM:
3104 if (l2cap_mode_supported(mode, remote_feat_mask))
3105 return mode;
3106 /* fall through */
3107 default:
3108 return L2CAP_MODE_BASIC;
3109 }
3110}
3111
848566b3 3112static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3113{
848566b3 3114 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
6327eb98
AE		 3115}
3116
848566b3 3117static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3118{
848566b3 3119 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
f89cef09
AE		 3120}
3121
36c86c85
MM		 3122static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3123 struct l2cap_conf_rfc *rfc)
3124{
6ed971ca 3125 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3126 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3127
3128 /* Class 1 devices have must have ERTM timeouts
3129 * exceeding the Link Supervision Timeout. The
3130 * default Link Supervision Timeout for AMP
3131 * controllers is 10 seconds.
3132 *
3133 * Class 1 devices use 0xffffffff for their
3134 * best-effort flush timeout, so the clamping logic
3135 * will result in a timeout that meets the above
3136 * requirement. ERTM timeouts are 16-bit values, so
3137 * the maximum timeout is 65.535 seconds.
3138 */
3139
3140 /* Convert timeout to milliseconds and round */
3141 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3142
3143 /* This is the recommended formula for class 2 devices
3144 * that start ERTM timers when packets are sent to the
3145 * controller.
3146 */
3147 ertm_to = 3 * ertm_to + 500;
3148
3149 if (ertm_to > 0xffff)
3150 ertm_to = 0xffff;
3151
3152 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3153 rfc->monitor_timeout = rfc->retrans_timeout;
3154 } else {
3155 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3156 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3157 }
3158}
3159
6327eb98
AE		 3160static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3161{
3162 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3163 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3164 /* use extended control field */
3165 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3166 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3167 } else {
6327eb98 3168 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3169 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3170 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3171 }
c20f8e35 3172 chan->ack_win = chan->tx_win;
6327eb98
AE		 3173}
3174
710f9b0a 3175static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3176{
1da177e4 3177 struct l2cap_conf_req *req = data;
0c1bc5c6 3178 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3179 void *ptr = req->data;
c8f79162 3180 u16 size;
1da177e4 3181
49208c9c 3182 BT_DBG("chan %p", chan);
1da177e4 3183
73ffa904 3184 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3185 goto done;
3186
0c1bc5c6 3187 switch (chan->mode) {
f2fcfcd6
GP		 3188 case L2CAP_MODE_STREAMING:
3189 case L2CAP_MODE_ERTM:
c1360a1c 3190 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3191 break;
85eb53c6 3192
848566b3 3193 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3194 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3195
2ba13ed6 3196 /* fall through */
f2fcfcd6 3197 default:
8c1d787b 3198 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3199 break;
3200 }
3201
3202done:
0c1bc5c6
GP		 3203 if (chan->imtu != L2CAP_DEFAULT_MTU)
3204 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3205
0c1bc5c6 3206 switch (chan->mode) {
65c7c491 3207 case L2CAP_MODE_BASIC:
8c1d787b 3208 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3209 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3210 break;
3211
62547752
GP		 3212 rfc.mode = L2CAP_MODE_BASIC;
3213 rfc.txwin_size = 0;
3214 rfc.max_transmit = 0;
3215 rfc.retrans_timeout = 0;
3216 rfc.monitor_timeout = 0;
3217 rfc.max_pdu_size = 0;
3218
63406504 3219 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3220 (unsigned long) &rfc);
65c7c491
MH		 3221 break;
3222
3223 case L2CAP_MODE_ERTM:
3224 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3225 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3226
3227 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3228
3229 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3230 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3231 L2CAP_FCS_SIZE);
c8f79162 3232 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3233
6327eb98
AE		 3234 l2cap_txwin_setup(chan);
3235
3236 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3237 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3238
63406504 3239 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3240 (unsigned long) &rfc);
63406504 3241
f89cef09
AE		 3242 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3243 l2cap_add_opt_efs(&ptr, chan);
3244
6327eb98
AE		 3245 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3246 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3247 chan->tx_win);
60918918
AE		 3248
3249 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3250 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3251 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3252 chan->fcs = L2CAP_FCS_NONE;
3253 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3254 chan->fcs);
3255 }
f2fcfcd6
GP		 3256 break;
3257
3258 case L2CAP_MODE_STREAMING:
273759e2 3259 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3260 rfc.mode = L2CAP_MODE_STREAMING;
3261 rfc.txwin_size = 0;
3262 rfc.max_transmit = 0;
3263 rfc.retrans_timeout = 0;
3264 rfc.monitor_timeout = 0;
c8f79162
AE		 3265
3266 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3267 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3268 L2CAP_FCS_SIZE);
c8f79162 3269 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3270
63406504 3271 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3272 (unsigned long) &rfc);
63406504 3273
f89cef09
AE		 3274 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3275 l2cap_add_opt_efs(&ptr, chan);
3276
60918918
AE		 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 }
65c7c491
MH		 3284 break;
3285 }
1da177e4 3286
fe4128e0 3287 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3288 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3289
3290 return ptr - data;
3291}
3292
73ffa904 3293static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3294{
5dee9e7c
MH		 3295 struct l2cap_conf_rsp *rsp = data;
3296 void *ptr = rsp->data;
73ffa904
GP		 3297 void *req = chan->conf_req;
3298 int len = chan->conf_len;
5dee9e7c
MH		 3299 int type, hint, olen;
3300 unsigned long val;
6464f35f 3301 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3302 struct l2cap_conf_efs efs;
3303 u8 remote_efs = 0;
861d6882 3304 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3305 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3306 u16 size;
1da177e4 3307
73ffa904 3308 BT_DBG("chan %p", chan);
820ae1b8 3309
5dee9e7c
MH		 3310 while (len >= L2CAP_CONF_OPT_SIZE) {
3311 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3312
589d2746 3313 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3314 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3315
3316 switch (type) {
3317 case L2CAP_CONF_MTU:
861d6882 3318 mtu = val;
5dee9e7c
MH		 3319 break;
3320
3321 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3322 chan->flush_to = val;
5dee9e7c
MH		 3323 break;
3324
3325 case L2CAP_CONF_QOS:
3326 break;
3327
6464f35f
MH		 3328 case L2CAP_CONF_RFC:
3329 if (olen == sizeof(rfc))
3330 memcpy(&rfc, (void *) val, olen);
3331 break;
3332
fcc203c3
GP		 3333 case L2CAP_CONF_FCS:
3334 if (val == L2CAP_FCS_NONE)
f2592d3e 3335 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3336 break;
fcc203c3 3337
42dceae2
AE		 3338 case L2CAP_CONF_EFS:
3339 remote_efs = 1;
3340 if (olen == sizeof(efs))
3341 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3342 break;
3343
6327eb98 3344 case L2CAP_CONF_EWS:
848566b3 3345 if (!chan->conn->hs_enabled)
6327eb98 3346 return -ECONNREFUSED;
fcc203c3 3347
6327eb98
AE		 3348 set_bit(FLAG_EXT_CTRL, &chan->flags);
3349 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3350 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3351 chan->remote_tx_win = val;
fcc203c3
GP		 3352 break;
3353
5dee9e7c
MH		 3354 default:
3355 if (hint)
3356 break;
3357
3358 result = L2CAP_CONF_UNKNOWN;
3359 *((u8 *) ptr++) = type;
3360 break;
3361 }
3362 }
3363
73ffa904 3364 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3365 goto done;
3366
0c1bc5c6 3367 switch (chan->mode) {
f2fcfcd6
GP		 3368 case L2CAP_MODE_STREAMING:
3369 case L2CAP_MODE_ERTM:
c1360a1c 3370 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3371 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3372 chan->conn->feat_mask);
85eb53c6
GP		 3373 break;
3374 }
3375
42dceae2 3376 if (remote_efs) {
848566b3 3377 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3378 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3379 else
3380 return -ECONNREFUSED;
3381 }
3382
0c1bc5c6 3383 if (chan->mode != rfc.mode)
f2fcfcd6 3384 return -ECONNREFUSED;
742e519b 3385
f2fcfcd6 3386 break;
f2fcfcd6
GP		 3387 }
3388
3389done:
0c1bc5c6 3390 if (chan->mode != rfc.mode) {
f2fcfcd6 3391 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3392 rfc.mode = chan->mode;
f2fcfcd6 3393
73ffa904 3394 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3395 return -ECONNREFUSED;
3396
2d792818
GP		 3397 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3398 (unsigned long) &rfc);
f2fcfcd6
GP		 3399 }
3400
5dee9e7c
MH		 3401 if (result == L2CAP_CONF_SUCCESS) {
3402 /* Configure output options and let the other side know
3403 * which ones we don't like. */
3404
f2fcfcd6
GP		 3405 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3406 result = L2CAP_CONF_UNACCEPT;
3407 else {
0c1bc5c6 3408 chan->omtu = mtu;
c1360a1c 3409 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3410 }
0c1bc5c6 3411 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3412
42dceae2
AE		 3413 if (remote_efs) {
3414 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3415 efs.stype != L2CAP_SERV_NOTRAFIC &&
3416 efs.stype != chan->local_stype) {
42dceae2
AE		 3417
3418 result = L2CAP_CONF_UNACCEPT;
3419
3420 if (chan->num_conf_req >= 1)
3421 return -ECONNREFUSED;
3422
3423 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3424 sizeof(efs),
3425 (unsigned long) &efs);
0e8b207e 3426 } else {
3e6b3b95 3427 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3428 result = L2CAP_CONF_PENDING;
3429 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3430 }
3431 }
3432
f2fcfcd6
GP		 3433 switch (rfc.mode) {
3434 case L2CAP_MODE_BASIC:
47d1ec61 3435 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3436 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3437 break;
3438
3439 case L2CAP_MODE_ERTM:
6327eb98
AE		 3440 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3441 chan->remote_tx_win = rfc.txwin_size;
3442 else
3443 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3444
2c03a7a4 3445 chan->remote_max_tx = rfc.max_transmit;
1c762159 3446
c8f79162 3447 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3448 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3449 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3450 rfc.max_pdu_size = cpu_to_le16(size);
3451 chan->remote_mps = size;
f2fcfcd6 3452
36c86c85 3453 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3454
c1360a1c 3455 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3456
3457 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3458 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3459
42dceae2
AE		 3460 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3461 chan->remote_id = efs.id;
3462 chan->remote_stype = efs.stype;
3463 chan->remote_msdu = le16_to_cpu(efs.msdu);
3464 chan->remote_flush_to =
2d792818 3465 le32_to_cpu(efs.flush_to);
42dceae2 3466 chan->remote_acc_lat =
2d792818 3467 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3468 chan->remote_sdu_itime =
3469 le32_to_cpu(efs.sdu_itime);
3470 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3471 sizeof(efs),
3472 (unsigned long) &efs);
42dceae2 3473 }
f2fcfcd6
GP		 3474 break;
3475
3476 case L2CAP_MODE_STREAMING:
c8f79162 3477 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3478 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3479 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3480 rfc.max_pdu_size = cpu_to_le16(size);
3481 chan->remote_mps = size;
f2fcfcd6 3482
c1360a1c 3483 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3484
2d792818
GP		 3485 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3486 (unsigned long) &rfc);
68ae6639 3487
f2fcfcd6
GP		 3488 break;
3489
3490 default:
5dee9e7c 3491 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3492
6464f35f 3493 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3494 rfc.mode = chan->mode;
f2fcfcd6 3495 }
6464f35f 3496
f2fcfcd6 3497 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3498 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3499 }
fe4128e0 3500 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3501 rsp->result = cpu_to_le16(result);
59e54bd1 3502 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3503
3504 return ptr - data;
1da177e4
LT		 3505}
3506
2d792818
GP		 3507static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3508 void *data, u16 *result)
f2fcfcd6 3509{
f2fcfcd6
GP		 3510 struct l2cap_conf_req *req = data;
3511 void *ptr = req->data;
3512 int type, olen;
3513 unsigned long val;
36e999a8 3514 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3515 struct l2cap_conf_efs efs;
f2fcfcd6 3516
fe4128e0 3517 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3518
3519 while (len >= L2CAP_CONF_OPT_SIZE) {
3520 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3521
3522 switch (type) {
3523 case L2CAP_CONF_MTU:
3524 if (val < L2CAP_DEFAULT_MIN_MTU) {
3525 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3526 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3527 } else
0c1bc5c6
GP		 3528 chan->imtu = val;
3529 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3530 break;
3531
3532 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3533 chan->flush_to = val;
f2fcfcd6 3534 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3535 2, chan->flush_to);
f2fcfcd6
GP		 3536 break;
3537
3538 case L2CAP_CONF_RFC:
3539 if (olen == sizeof(rfc))
3540 memcpy(&rfc, (void *)val, olen);
3541
c1360a1c 3542 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3543 rfc.mode != chan->mode)
f2fcfcd6
GP		 3544 return -ECONNREFUSED;
3545
47d1ec61 3546 chan->fcs = 0;
f2fcfcd6
GP		 3547
3548 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3549 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3550 break;
6327eb98
AE		 3551
3552 case L2CAP_CONF_EWS:
c20f8e35 3553 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3554 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3555 chan->tx_win);
6327eb98 3556 break;
66af7aaf
AE		 3557
3558 case L2CAP_CONF_EFS:
3559 if (olen == sizeof(efs))
3560 memcpy(&efs, (void *)val, olen);
3561
3562 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3563 efs.stype != L2CAP_SERV_NOTRAFIC &&
3564 efs.stype != chan->local_stype)
66af7aaf
AE		 3565 return -ECONNREFUSED;
3566
2d792818
GP		 3567 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3568 (unsigned long) &efs);
66af7aaf 3569 break;
cbabee78
AE		 3570
3571 case L2CAP_CONF_FCS:
3572 if (*result == L2CAP_CONF_PENDING)
3573 if (val == L2CAP_FCS_NONE)
f2592d3e 3574 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3575 &chan->conf_state);
3576 break;
f2fcfcd6
GP		 3577 }
3578 }
3579
0c1bc5c6 3580 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3581 return -ECONNREFUSED;
3582
0c1bc5c6 3583 chan->mode = rfc.mode;
6c2ea7a8 3584
0e8b207e 3585 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3586 switch (rfc.mode) {
3587 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3588 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3589 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3590 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3591 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3592 chan->ack_win = min_t(u16, chan->ack_win,
3593 rfc.txwin_size);
66af7aaf
AE		 3594
3595 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3596 chan->local_msdu = le16_to_cpu(efs.msdu);
3597 chan->local_sdu_itime =
2d792818 3598 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3599 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3600 chan->local_flush_to =
2d792818 3601 le32_to_cpu(efs.flush_to);
66af7aaf 3602 }
f2fcfcd6 3603 break;
66af7aaf 3604
f2fcfcd6 3605 case L2CAP_MODE_STREAMING:
47d1ec61 3606 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3607 }
3608 }
3609
fe4128e0 3610 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3611 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3612
3613 return ptr - data;
3614}
3615
2d792818
GP		 3616static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3617 u16 result, u16 flags)
1da177e4
LT		 3618{
3619 struct l2cap_conf_rsp *rsp = data;
3620 void *ptr = rsp->data;
1da177e4 3621
fe4128e0 3622 BT_DBG("chan %p", chan);
1da177e4 3623
fe4128e0 3624 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3625 rsp->result = cpu_to_le16(result);
aca3192c 3626 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3627
3628 return ptr - data;
3629}
3630
27e2d4c8
JH		 3631void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3632{
3633 struct l2cap_le_conn_rsp rsp;
3634 struct l2cap_conn *conn = chan->conn;
3635
3636 BT_DBG("chan %p", chan);
3637
3638 rsp.dcid = cpu_to_le16(chan->scid);
3639 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3640 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3641 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 3642 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3643
3644 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3645 &rsp);
3646}
3647
8c1d787b 3648void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3649{
3650 struct l2cap_conn_rsp rsp;
8c1d787b 3651 struct l2cap_conn *conn = chan->conn;
710f9b0a 3652 u8 buf[128];
439f34ac 3653 u8 rsp_code;
710f9b0a 3654
fe4128e0
GP		 3655 rsp.scid = cpu_to_le16(chan->dcid);
3656 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3657 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3658 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3659
3660 if (chan->hs_hcon)
3661 rsp_code = L2CAP_CREATE_CHAN_RSP;
3662 else
3663 rsp_code = L2CAP_CONN_RSP;
3664
3665 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3666
3667 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3668
c1360a1c 3669 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3670 return;
3671
710f9b0a 3672 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3673 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3674 chan->num_conf_req++;
3675}
3676
47d1ec61 3677static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3678{
7b1c0049
GP		 3679 int type, olen;
3680 unsigned long val;
c20f8e35
MM		 3681 /* Use sane default values in case a misbehaving remote device
3682 * did not send an RFC or extended window size option.
3683 */
3684 u16 txwin_ext = chan->ack_win;
3685 struct l2cap_conf_rfc rfc = {
3686 .mode = chan->mode,
3687 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3688 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3689 .max_pdu_size = cpu_to_le16(chan->imtu),
3690 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3691 };
7b1c0049 3692
47d1ec61 3693 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3694
0c1bc5c6 3695 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3696 return;
3697
3698 while (len >= L2CAP_CONF_OPT_SIZE) {
3699 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3700
c20f8e35
MM		 3701 switch (type) {
3702 case L2CAP_CONF_RFC:
3703 if (olen == sizeof(rfc))
3704 memcpy(&rfc, (void *)val, olen);
8f321f85 3705 break;
c20f8e35
MM		 3706 case L2CAP_CONF_EWS:
3707 txwin_ext = val;
3708 break;
3709 }
7b1c0049
GP		 3710 }
3711
7b1c0049
GP		 3712 switch (rfc.mode) {
3713 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3714 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3715 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3716 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3717 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3718 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3719 else
3720 chan->ack_win = min_t(u16, chan->ack_win,
3721 rfc.txwin_size);
7b1c0049
GP		 3722 break;
3723 case L2CAP_MODE_STREAMING:
47d1ec61 3724 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3725 }
3726}
3727
2d792818 3728static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3729 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3730 u8 *data)
4e8402a3 3731{
e2fd318e 3732 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3733
cb3b3152
JH		 3734 if (cmd_len < sizeof(*rej))
3735 return -EPROTO;
3736
e2fd318e 3737 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3738 return 0;
3739
3740 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3741 cmd->ident == conn->info_ident) {
17cd3f37 3742 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3743
3744 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3745 conn->info_ident = 0;
984947dc 3746
4e8402a3
MH		 3747 l2cap_conn_start(conn);
3748 }
3749
3750 return 0;
3751}
3752
1700915f
MM		 3753static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3754 struct l2cap_cmd_hdr *cmd,
3755 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3756{
1da177e4
LT		 3757 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3758 struct l2cap_conn_rsp rsp;
23691d75 3759 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3760 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3761
3762 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3763 __le16 psm = req->psm;
1da177e4 3764
097db76c 3765 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3766
3767 /* Check if we have socket listening on psm */
6f59b904 3768 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3769 &conn->hcon->dst, ACL_LINK);
23691d75 3770 if (!pchan) {
1da177e4
LT		 3771 result = L2CAP_CR_BAD_PSM;
3772 goto sendresp;
3773 }
3774
3df91ea2 3775 mutex_lock(&conn->chan_lock);
8ffb9290 3776 l2cap_chan_lock(pchan);
e0f0cb56 3777
e7c29cb1 3778 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3779 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3780 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3781 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3782 result = L2CAP_CR_SEC_BLOCK;
3783 goto response;
3784 }
3785
1da177e4
LT		 3786 result = L2CAP_CR_NO_MEM;
3787
2dfa1003
GP		 3788 /* Check if we already have channel with that dcid */
3789 if (__l2cap_get_chan_by_dcid(conn, scid))
3790 goto response;
3791
80b98027 3792 chan = pchan->ops->new_connection(pchan);
80808e43 3793 if (!chan)
1da177e4
LT		 3794 goto response;
3795
330b6c15
SS		 3796 /* For certain devices (ex: HID mouse), support for authentication,
3797 * pairing and bonding is optional. For such devices, inorder to avoid
3798 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3799 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3800 */
3801 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3802
7eafc59e
MH		 3803 bacpy(&chan->src, &conn->hcon->src);
3804 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 3805 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3806 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
fe4128e0
GP		 3807 chan->psm = psm;
3808 chan->dcid = scid;
1700915f 3809 chan->local_amp_id = amp_id;
1da177e4 3810
6be36555 3811 __l2cap_chan_add(conn, chan);
48454079 3812
fe4128e0 3813 dcid = chan->scid;
1da177e4 3814
8d836d71 3815 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3816
fc7f8a7e 3817 chan->ident = cmd->ident;
1da177e4 3818
984947dc 3819 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3820 if (l2cap_chan_check_security(chan)) {
bdc25783 3821 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3822 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3823 result = L2CAP_CR_PEND;
3824 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3825 chan->ops->defer(chan);
f66dc81f 3826 } else {
1700915f
MM		 3827 /* Force pending result for AMP controllers.
3828 * The connection will succeed after the
3829 * physical link is up.
3830 */
6ed971ca 3831 if (amp_id == AMP_ID_BREDR) {
f93fa273 3832 l2cap_state_change(chan, BT_CONFIG);
1700915f 3833 result = L2CAP_CR_SUCCESS;
6ed971ca 3834 } else {
f93fa273 3835 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3836 result = L2CAP_CR_PEND;
1700915f 3837 }
f66dc81f
MH		 3838 status = L2CAP_CS_NO_INFO;
3839 }
79d554a6 3840 } else {
f93fa273 3841 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3842 result = L2CAP_CR_PEND;
3843 status = L2CAP_CS_AUTHEN_PEND;
3844 }
3845 } else {
f93fa273 3846 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3847 result = L2CAP_CR_PEND;
3848 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3849 }
3850
1da177e4 3851response:
8ffb9290 3852 l2cap_chan_unlock(pchan);
3df91ea2 3853 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3854
3855sendresp:
aca3192c
YH		 3856 rsp.scid = cpu_to_le16(scid);
3857 rsp.dcid = cpu_to_le16(dcid);
3858 rsp.result = cpu_to_le16(result);
3859 rsp.status = cpu_to_le16(status);
4c89b6aa 3860 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3861
3862 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3863 struct l2cap_info_req info;
ac73498c 3864 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3865
3866 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3867 conn->info_ident = l2cap_get_ident(conn);
3868
ba13ccd9 3869 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3870
2d792818
GP		 3871 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3872 sizeof(info), &info);
79d554a6
MH		 3873 }
3874
c1360a1c 3875 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3876 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3877 u8 buf[128];
c1360a1c 3878 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3879 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3880 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3881 chan->num_conf_req++;
e9aeb2dd 3882 }
1700915f
MM		 3883
3884 return chan;
4c89b6aa 3885}
e9aeb2dd 3886
4c89b6aa 3887static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3888 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3889{
7b064eda
JK		 3890 struct hci_dev *hdev = conn->hcon->hdev;
3891 struct hci_conn *hcon = conn->hcon;
3892
cb3b3152
JH		 3893 if (cmd_len < sizeof(struct l2cap_conn_req))
3894 return -EPROTO;
3895
7b064eda
JK		 3896 hci_dev_lock(hdev);
3897 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3898 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3899 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3900 hcon->dst_type, 0, NULL, 0,
3901 hcon->dev_class);
3902 hci_dev_unlock(hdev);
3903
300229f9 3904 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3905 return 0;
3906}
3907
5909cf30 3908static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3909 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3910 u8 *data)
1da177e4
LT		 3911{
3912 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3913 u16 scid, dcid, result, status;
48454079 3914 struct l2cap_chan *chan;
1da177e4 3915 u8 req[128];
3df91ea2 3916 int err;
1da177e4 3917
cb3b3152
JH		 3918 if (cmd_len < sizeof(*rsp))
3919 return -EPROTO;
3920
1da177e4
LT		 3921 scid = __le16_to_cpu(rsp->scid);
3922 dcid = __le16_to_cpu(rsp->dcid);
3923 result = __le16_to_cpu(rsp->result);
3924 status = __le16_to_cpu(rsp->status);
3925
1b009c98 3926 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3927 dcid, scid, result, status);
1da177e4 3928
3df91ea2
AE		 3929 mutex_lock(&conn->chan_lock);
3930
1da177e4 3931 if (scid) {
3df91ea2
AE		 3932 chan = __l2cap_get_chan_by_scid(conn, scid);
3933 if (!chan) {
21870b52 3934 err = -EBADSLT;
3df91ea2
AE		 3935 goto unlock;
3936 }
1da177e4 3937 } else {
3df91ea2
AE		 3938 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3939 if (!chan) {
21870b52 3940 err = -EBADSLT;
3df91ea2
AE		 3941 goto unlock;
3942 }
1da177e4
LT		 3943 }
3944
3df91ea2
AE		 3945 err = 0;
3946
6be36555 3947 l2cap_chan_lock(chan);
48454079 3948
1da177e4
LT		 3949 switch (result) {
3950 case L2CAP_CR_SUCCESS:
89bc500e 3951 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3952 chan->ident = 0;
fe4128e0 3953 chan->dcid = dcid;
c1360a1c 3954 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3955
c1360a1c 3956 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3957 break;
3958
1da177e4 3959 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3960 l2cap_build_conf_req(chan, req), req);
73ffa904 3961 chan->num_conf_req++;
1da177e4
LT		 3962 break;
3963
3964 case L2CAP_CR_PEND:
c1360a1c 3965 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3966 break;
3967
3968 default:
48454079 3969 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3970 break;
3971 }
3972
6be36555 3973 l2cap_chan_unlock(chan);
3df91ea2
AE		 3974
3975unlock:
3976 mutex_unlock(&conn->chan_lock);
3977
3978 return err;
1da177e4
LT		 3979}
3980
47d1ec61 3981static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3982{
3983 /* FCS is enabled only in ERTM or streaming mode, if one or both
3984 * sides request it.
3985 */
0c1bc5c6 3986 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3987 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3988 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3989 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3990}
3991
29d8a590
AE		 3992static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3993 u8 ident, u16 flags)
3994{
3995 struct l2cap_conn *conn = chan->conn;
3996
3997 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3998 flags);
3999
4000 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
4001 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
4002
4003 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4004 l2cap_build_conf_rsp(chan, data,
4005 L2CAP_CONF_SUCCESS, flags), data);
4006}
4007
662d652d
JH		 4008static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4009 u16 scid, u16 dcid)
4010{
4011 struct l2cap_cmd_rej_cid rej;
4012
4013 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
4014 rej.scid = __cpu_to_le16(scid);
4015 rej.dcid = __cpu_to_le16(dcid);
4016
4017 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4018}
4019
2d792818
GP		 4020static inline int l2cap_config_req(struct l2cap_conn *conn,
4021 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4022 u8 *data)
1da177e4
LT		 4023{
4024 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4025 u16 dcid, flags;
4026 u8 rsp[64];
48454079 4027 struct l2cap_chan *chan;
3c588192 4028 int len, err = 0;
1da177e4 4029
cb3b3152
JH		 4030 if (cmd_len < sizeof(*req))
4031 return -EPROTO;
4032
1da177e4
LT		 4033 dcid = __le16_to_cpu(req->dcid);
4034 flags = __le16_to_cpu(req->flags);
4035
4036 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4037
baa7e1fa 4038 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4039 if (!chan) {
4040 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4041 return 0;
4042 }
1da177e4 4043
033b1142 4044 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4045 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4046 chan->dcid);
354f60a9 4047 goto unlock;
df6bd743 4048 }
354f60a9 4049
5dee9e7c 4050 /* Reject if config buffer is too small. */
88219a0f 4051 len = cmd_len - sizeof(*req);
cb3b3152 4052 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4053 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4054 l2cap_build_conf_rsp(chan, rsp,
4055 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4056 goto unlock;
4057 }
4058
4059 /* Store config. */
73ffa904
GP		 4060 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4061 chan->conf_len += len;
1da177e4 4062
59e54bd1 4063 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4064 /* Incomplete config. Send empty response. */
4065 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4066 l2cap_build_conf_rsp(chan, rsp,
4067 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4068 goto unlock;
4069 }
4070
4071 /* Complete config. */
73ffa904 4072 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4073 if (len < 0) {
5e4e3972 4074 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4075 goto unlock;
f2fcfcd6 4076 }
1da177e4 4077
1500109b 4078 chan->ident = cmd->ident;
5dee9e7c 4079 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4080 chan->num_conf_rsp++;
5dee9e7c 4081
5dee9e7c 4082 /* Reset config buffer. */
73ffa904 4083 chan->conf_len = 0;
5dee9e7c 4084
c1360a1c 4085 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4086 goto unlock;
4087
c1360a1c 4088 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4089 set_default_fcs(chan);
fcc203c3 4090
105bdf9e
MM		 4091 if (chan->mode == L2CAP_MODE_ERTM ||
4092 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4093 err = l2cap_ertm_init(chan);
4094
4095 if (err < 0)
5e4e3972 4096 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4097 else
4098 l2cap_chan_ready(chan);
0565c1c2 4099
876d9484
MH		 4100 goto unlock;
4101 }
4102
c1360a1c 4103 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4104 u8 buf[64];
1da177e4 4105 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4106 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4107 chan->num_conf_req++;
1da177e4
LT		 4108 }
4109
0e8b207e
AE		 4110 /* Got Conf Rsp PENDING from remote side and asume we sent
4111 Conf Rsp PENDING in the code above */
4112 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4113 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4114
4115 /* check compatibility */
4116
79de886d 4117 /* Send rsp for BR/EDR channel */
f351bc72 4118 if (!chan->hs_hcon)
79de886d
AE		 4119 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4120 else
4121 chan->ident = cmd->ident;
0e8b207e
AE		 4122 }
4123
1da177e4 4124unlock:
6be36555 4125 l2cap_chan_unlock(chan);
3c588192 4126 return err;
1da177e4
LT		 4127}
4128
2d792818 4129static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4130 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4131 u8 *data)
1da177e4
LT		 4132{
4133 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4134 u16 scid, flags, result;
48454079 4135 struct l2cap_chan *chan;
cb3b3152 4136 int len = cmd_len - sizeof(*rsp);
3c588192 4137 int err = 0;
1da177e4 4138
cb3b3152
JH		 4139 if (cmd_len < sizeof(*rsp))
4140 return -EPROTO;
4141
1da177e4
LT		 4142 scid = __le16_to_cpu(rsp->scid);
4143 flags = __le16_to_cpu(rsp->flags);
4144 result = __le16_to_cpu(rsp->result);
4145
61386cba
AE		 4146 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4147 result, len);
1da177e4 4148
baa7e1fa 4149 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4150 if (!chan)
1da177e4
LT		 4151 return 0;
4152
4153 switch (result) {
4154 case L2CAP_CONF_SUCCESS:
47d1ec61 4155 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4156 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4157 break;
4158
0e8b207e
AE		 4159 case L2CAP_CONF_PENDING:
4160 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4161
4162 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4163 char buf[64];
4164
4165 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4166 buf, &result);
0e8b207e 4167 if (len < 0) {
5e4e3972 4168 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4169 goto done;
4170 }
4171
f351bc72 4172 if (!chan->hs_hcon) {
79de886d
AE		 4173 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4174 0);
5ce66b59
AE		 4175 } else {
4176 if (l2cap_check_efs(chan)) {
4177 amp_create_logical_link(chan);
4178 chan->ident = cmd->ident;
4179 }
4180 }
0e8b207e
AE		 4181 }
4182 goto done;
4183
1da177e4 4184 case L2CAP_CONF_UNACCEPT:
73ffa904 4185 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4186 char req[64];
4187
c2c77ec8 4188 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4189 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4190 goto done;
4191 }
4192
f2fcfcd6
GP		 4193 /* throw out any old stored conf requests */
4194 result = L2CAP_CONF_SUCCESS;
b4450035 4195 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4196 req, &result);
f2fcfcd6 4197 if (len < 0) {
5e4e3972 4198 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4199 goto done;
4200 }
4201
4202 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4203 L2CAP_CONF_REQ, len, req);
73ffa904 4204 chan->num_conf_req++;
f2fcfcd6
GP		 4205 if (result != L2CAP_CONF_SUCCESS)
4206 goto done;
4207 break;
1da177e4
LT		 4208 }
4209
8e87d142 4210 default:
6be36555 4211 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4212
ba13ccd9 4213 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4214 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4215 goto done;
4216 }
4217
59e54bd1 4218 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4219 goto done;
4220
c1360a1c 4221 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4222
c1360a1c 4223 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4224 set_default_fcs(chan);
fcc203c3 4225
105bdf9e
MM		 4226 if (chan->mode == L2CAP_MODE_ERTM ||
4227 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4228 err = l2cap_ertm_init(chan);
0565c1c2 4229
3c588192 4230 if (err < 0)
5e4e3972 4231 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4232 else
4233 l2cap_chan_ready(chan);
1da177e4
LT		 4234 }
4235
4236done:
6be36555 4237 l2cap_chan_unlock(chan);
3c588192 4238 return err;
1da177e4
LT		 4239}
4240
2d792818 4241static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4242 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4243 u8 *data)
1da177e4
LT		 4244{
4245 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4246 struct l2cap_disconn_rsp rsp;
4247 u16 dcid, scid;
48454079 4248 struct l2cap_chan *chan;
1da177e4 4249
cb3b3152
JH		 4250 if (cmd_len != sizeof(*req))
4251 return -EPROTO;
4252
1da177e4
LT		 4253 scid = __le16_to_cpu(req->scid);
4254 dcid = __le16_to_cpu(req->dcid);
4255
4256 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4257
3df91ea2
AE		 4258 mutex_lock(&conn->chan_lock);
4259
4260 chan = __l2cap_get_chan_by_scid(conn, dcid);
4261 if (!chan) {
4262 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4263 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4264 return 0;
3df91ea2 4265 }
1da177e4 4266
6be36555
AE		 4267 l2cap_chan_lock(chan);
4268
fe4128e0
GP		 4269 rsp.dcid = cpu_to_le16(chan->scid);
4270 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4271 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4272
5ec1bbe5 4273 chan->ops->set_shutdown(chan);
1da177e4 4274
61d6ef3e 4275 l2cap_chan_hold(chan);
48454079 4276 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4277
4278 l2cap_chan_unlock(chan);
1da177e4 4279
80b98027 4280 chan->ops->close(chan);
61d6ef3e 4281 l2cap_chan_put(chan);
3df91ea2
AE		 4282
4283 mutex_unlock(&conn->chan_lock);
4284
1da177e4
LT		 4285 return 0;
4286}
4287
2d792818 4288static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4289 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4290 u8 *data)
1da177e4
LT		 4291{
4292 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4293 u16 dcid, scid;
48454079 4294 struct l2cap_chan *chan;
1da177e4 4295
cb3b3152
JH		 4296 if (cmd_len != sizeof(*rsp))
4297 return -EPROTO;
4298
1da177e4
LT		 4299 scid = __le16_to_cpu(rsp->scid);
4300 dcid = __le16_to_cpu(rsp->dcid);
4301
4302 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4303
3df91ea2
AE		 4304 mutex_lock(&conn->chan_lock);
4305
4306 chan = __l2cap_get_chan_by_scid(conn, scid);
4307 if (!chan) {
4308 mutex_unlock(&conn->chan_lock);
1da177e4 4309 return 0;
3df91ea2 4310 }
1da177e4 4311
6be36555 4312 l2cap_chan_lock(chan);
48454079 4313
61d6ef3e 4314 l2cap_chan_hold(chan);
48454079 4315 l2cap_chan_del(chan, 0);
6be36555
AE		 4316
4317 l2cap_chan_unlock(chan);
1da177e4 4318
80b98027 4319 chan->ops->close(chan);
61d6ef3e 4320 l2cap_chan_put(chan);
3df91ea2
AE		 4321
4322 mutex_unlock(&conn->chan_lock);
4323
1da177e4
LT		 4324 return 0;
4325}
4326
2d792818 4327static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4328 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4329 u8 *data)
1da177e4
LT		 4330{
4331 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4332 u16 type;
4333
cb3b3152
JH		 4334 if (cmd_len != sizeof(*req))
4335 return -EPROTO;
4336
1da177e4
LT		 4337 type = __le16_to_cpu(req->type);
4338
4339 BT_DBG("type 0x%4.4x", type);
4340
f0709e03
MH		 4341 if (type == L2CAP_IT_FEAT_MASK) {
4342 u8 buf[8];
44dd46de 4343 u32 feat_mask = l2cap_feat_mask;
f0709e03 4344 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4345 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4346 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4347 if (!disable_ertm)
fcc203c3 4348 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4349 | L2CAP_FEAT_FCS;
848566b3 4350 if (conn->hs_enabled)
6327eb98 4351 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4352 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4353
1b7bf4ed 4354 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4355 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4356 buf);
e1027a7c
MH		 4357 } else if (type == L2CAP_IT_FIXED_CHAN) {
4358 u8 buf[12];
4359 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4360
848566b3 4361 if (conn->hs_enabled)
50a147cd
MM		 4362 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4363 else
4364 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4365
ac73498c
AE		 4366 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4367 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4368 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4369 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4370 buf);
f0709e03
MH		 4371 } else {
4372 struct l2cap_info_rsp rsp;
4373 rsp.type = cpu_to_le16(type);
ac73498c 4374 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4375 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4376 &rsp);
f0709e03 4377 }
1da177e4
LT		 4378
4379 return 0;
4380}
4381
2d792818 4382static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4383 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4384 u8 *data)
1da177e4
LT		 4385{
4386 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4387 u16 type, result;
4388
3f6fa3d4 4389 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4390 return -EPROTO;
4391
1da177e4
LT		 4392 type = __le16_to_cpu(rsp->type);
4393 result = __le16_to_cpu(rsp->result);
4394
4395 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4396
e90165be
AE		 4397 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4398 if (cmd->ident != conn->info_ident ||
2d792818 4399 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4400 return 0;
4401
17cd3f37 4402 cancel_delayed_work(&conn->info_timer);
4e8402a3 4403
adb08ede
VT		 4404 if (result != L2CAP_IR_SUCCESS) {
4405 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4406 conn->info_ident = 0;
4407
4408 l2cap_conn_start(conn);
4409
4410 return 0;
4411 }
4412
978c93b9
AE		 4413 switch (type) {
4414 case L2CAP_IT_FEAT_MASK:
83985319 4415 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4416
47ec1dcd 4417 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4418 struct l2cap_info_req req;
ac73498c 4419 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4420
4421 conn->info_ident = l2cap_get_ident(conn);
4422
4423 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4424 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4425 } else {
4426 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4427 conn->info_ident = 0;
4428
4429 l2cap_conn_start(conn);
4430 }
978c93b9
AE		 4431 break;
4432
4433 case L2CAP_IT_FIXED_CHAN:
4434 conn->fixed_chan_mask = rsp->data[0];
984947dc 4435 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4436 conn->info_ident = 0;
984947dc
MH		 4437
4438 l2cap_conn_start(conn);
978c93b9 4439 break;
984947dc 4440 }
4e8402a3 4441
1da177e4
LT		 4442 return 0;
4443}
4444
1700915f
MM		 4445static int l2cap_create_channel_req(struct l2cap_conn *conn,
4446 struct l2cap_cmd_hdr *cmd,
4447 u16 cmd_len, void *data)
f94ff6ff
MM		 4448{
4449 struct l2cap_create_chan_req *req = data;
6e1df6a6 4450 struct l2cap_create_chan_rsp rsp;
1700915f 4451 struct l2cap_chan *chan;
6e1df6a6 4452 struct hci_dev *hdev;
f94ff6ff
MM		 4453 u16 psm, scid;
4454
4455 if (cmd_len != sizeof(*req))
4456 return -EPROTO;
4457
848566b3 4458 if (!conn->hs_enabled)
f94ff6ff
MM		 4459 return -EINVAL;
4460
4461 psm = le16_to_cpu(req->psm);
4462 scid = le16_to_cpu(req->scid);
4463
ad0ac6ca 4464 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4465
6e1df6a6 4466 /* For controller id 0 make BR/EDR connection */
6ed971ca 4467 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4468 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4469 req->amp_id);
4470 return 0;
4471 }
1700915f 4472
6e1df6a6
AE		 4473 /* Validate AMP controller id */
4474 hdev = hci_dev_get(req->amp_id);
4475 if (!hdev)
4476 goto error;
1700915f 4477
6e1df6a6
AE		 4478 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4479 hci_dev_put(hdev);
4480 goto error;
4481 }
1700915f 4482
6e1df6a6
AE		 4483 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4484 req->amp_id);
4485 if (chan) {
4486 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4487 struct hci_conn *hs_hcon;
1700915f 4488
98e0f7ea
MH		 4489 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4490 &conn->hcon->dst);
6e1df6a6
AE		 4491 if (!hs_hcon) {
4492 hci_dev_put(hdev);
662d652d
JH		 4493 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4494 chan->dcid);
4495 return 0;
1700915f
MM		 4496 }
4497
6e1df6a6
AE		 4498 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4499
6e1df6a6
AE		 4500 mgr->bredr_chan = chan;
4501 chan->hs_hcon = hs_hcon;
fd45bf4c 4502 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4503 conn->mtu = hdev->block_mtu;
1700915f 4504 }
f94ff6ff 4505
6e1df6a6 4506 hci_dev_put(hdev);
f94ff6ff
MM		 4507
4508 return 0;
6e1df6a6
AE		 4509
4510error:
4511 rsp.dcid = 0;
4512 rsp.scid = cpu_to_le16(scid);
4513 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4514 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4515
4516 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4517 sizeof(rsp), &rsp);
4518
dc280801 4519 return 0;
f94ff6ff
MM		 4520}
4521
8eb200bd
MM		 4522static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4523{
4524 struct l2cap_move_chan_req req;
4525 u8 ident;
4526
4527 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4528
4529 ident = l2cap_get_ident(chan->conn);
4530 chan->ident = ident;
4531
4532 req.icid = cpu_to_le16(chan->scid);
4533 req.dest_amp_id = dest_amp_id;
4534
4535 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4536 &req);
4537
4538 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4539}
4540
1500109b 4541static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4542{
4543 struct l2cap_move_chan_rsp rsp;
4544
1500109b 4545 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4546
1500109b 4547 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4548 rsp.result = cpu_to_le16(result);
4549
1500109b
MM		 4550 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4551 sizeof(rsp), &rsp);
8d5a04a1
MM		 4552}
4553
5b155ef9 4554static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4555{
4556 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4557
5b155ef9 4558 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4559
5b155ef9 4560 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4561
5b155ef9 4562 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4563 cfm.result = cpu_to_le16(result);
4564
5b155ef9
MM		 4565 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4566 sizeof(cfm), &cfm);
4567
4568 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4569}
4570
4571static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4572{
4573 struct l2cap_move_chan_cfm cfm;
4574
4575 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4576
4577 cfm.icid = cpu_to_le16(icid);
4578 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4579
4580 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4581 sizeof(cfm), &cfm);
8d5a04a1
MM		 4582}
4583
4584static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4585 u16 icid)
8d5a04a1
MM		 4586{
4587 struct l2cap_move_chan_cfm_rsp rsp;
4588
ad0ac6ca 4589 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4590
4591 rsp.icid = cpu_to_le16(icid);
4592 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4593}
4594
5f3847a4
MM		 4595static void __release_logical_link(struct l2cap_chan *chan)
4596{
4597 chan->hs_hchan = NULL;
4598 chan->hs_hcon = NULL;
4599
4600 /* Placeholder - release the logical link */
4601}
4602
1500109b
MM		 4603static void l2cap_logical_fail(struct l2cap_chan *chan)
4604{
4605 /* Logical link setup failed */
4606 if (chan->state != BT_CONNECTED) {
4607 /* Create channel failure, disconnect */
5e4e3972 4608 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4609 return;
4610 }
4611
4612 switch (chan->move_role) {
4613 case L2CAP_MOVE_ROLE_RESPONDER:
4614 l2cap_move_done(chan);
4615 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4616 break;
4617 case L2CAP_MOVE_ROLE_INITIATOR:
4618 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4619 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4620 /* Remote has only sent pending or
4621 * success responses, clean up
4622 */
4623 l2cap_move_done(chan);
4624 }
4625
4626 /* Other amp move states imply that the move
4627 * has already aborted
4628 */
4629 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4630 break;
4631 }
4632}
4633
4634static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4635 struct hci_chan *hchan)
4636{
4637 struct l2cap_conf_rsp rsp;
1500109b 4638
336178a3 4639 chan->hs_hchan = hchan;
1500109b
MM		 4640 chan->hs_hcon->l2cap_data = chan->conn;
4641
35ba9561 4642 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4643
4644 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4645 int err;
1500109b
MM		 4646
4647 set_default_fcs(chan);
4648
4649 err = l2cap_ertm_init(chan);
4650 if (err < 0)
5e4e3972 4651 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4652 else
4653 l2cap_chan_ready(chan);
4654 }
4655}
4656
4657static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4658 struct hci_chan *hchan)
4659{
4660 chan->hs_hcon = hchan->conn;
4661 chan->hs_hcon->l2cap_data = chan->conn;
4662
4663 BT_DBG("move_state %d", chan->move_state);
4664
4665 switch (chan->move_state) {
4666 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4667 /* Move confirm will be sent after a success
4668 * response is received
4669 */
4670 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4671 break;
4672 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4673 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4674 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4675 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4676 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4677 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4678 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4679 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4680 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4681 }
4682 break;
4683 default:
4684 /* Move was not in expected state, free the channel */
4685 __release_logical_link(chan);
4686
4687 chan->move_state = L2CAP_MOVE_STABLE;
4688 }
4689}
4690
4691/* Call with chan locked */
27695fb4
AE		 4692void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4693 u8 status)
5b155ef9 4694{
1500109b
MM		 4695 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4696
4697 if (status) {
4698 l2cap_logical_fail(chan);
4699 __release_logical_link(chan);
4700 return;
4701 }
4702
4703 if (chan->state != BT_CONNECTED) {
4704 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4705 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4706 l2cap_logical_finish_create(chan, hchan);
4707 } else {
4708 l2cap_logical_finish_move(chan, hchan);
4709 }
5b155ef9
MM		 4710}
4711
3f7a56c4
MM		 4712void l2cap_move_start(struct l2cap_chan *chan)
4713{
4714 BT_DBG("chan %p", chan);
4715
6ed971ca 4716 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4717 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4718 return;
4719 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4720 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4721 /* Placeholder - start physical link setup */
4722 } else {
4723 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4724 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4725 chan->move_id = 0;
4726 l2cap_move_setup(chan);
4727 l2cap_send_move_chan_req(chan, 0);
4728 }
4729}
4730
8eb200bd
MM		 4731static void l2cap_do_create(struct l2cap_chan *chan, int result,
4732 u8 local_amp_id, u8 remote_amp_id)
4733{
62748ca1
AE		 4734 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4735 local_amp_id, remote_amp_id);
4736
12d6cc60
AE		 4737 chan->fcs = L2CAP_FCS_NONE;
4738
62748ca1
AE		 4739 /* Outgoing channel on AMP */
4740 if (chan->state == BT_CONNECT) {
4741 if (result == L2CAP_CR_SUCCESS) {
4742 chan->local_amp_id = local_amp_id;
4743 l2cap_send_create_chan_req(chan, remote_amp_id);
4744 } else {
4745 /* Revert to BR/EDR connect */
4746 l2cap_send_conn_req(chan);
4747 }
4748
4749 return;
4750 }
4751
4752 /* Incoming channel on AMP */
4753 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4754 struct l2cap_conn_rsp rsp;
4755 char buf[128];
4756 rsp.scid = cpu_to_le16(chan->dcid);
4757 rsp.dcid = cpu_to_le16(chan->scid);
4758
8eb200bd
MM		 4759 if (result == L2CAP_CR_SUCCESS) {
4760 /* Send successful response */
62cd50e2
AE		 4761 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4762 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4763 } else {
4764 /* Send negative response */
62cd50e2
AE		 4765 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4766 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4767 }
4768
4769 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4770 sizeof(rsp), &rsp);
4771
4772 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4773 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4774 set_bit(CONF_REQ_SENT, &chan->conf_state);
4775 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4776 L2CAP_CONF_REQ,
4777 l2cap_build_conf_req(chan, buf), buf);
4778 chan->num_conf_req++;
4779 }
8eb200bd
MM		 4780 }
4781}
4782
4783static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4784 u8 remote_amp_id)
4785{
4786 l2cap_move_setup(chan);
4787 chan->move_id = local_amp_id;
4788 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4789
4790 l2cap_send_move_chan_req(chan, remote_amp_id);
4791}
4792
4793static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4794{
4795 struct hci_chan *hchan = NULL;
4796
4797 /* Placeholder - get hci_chan for logical link */
4798
4799 if (hchan) {
4800 if (hchan->state == BT_CONNECTED) {
4801 /* Logical link is ready to go */
4802 chan->hs_hcon = hchan->conn;
4803 chan->hs_hcon->l2cap_data = chan->conn;
4804 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4805 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4806
4807 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4808 } else {
4809 /* Wait for logical link to be ready */
4810 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4811 }
4812 } else {
4813 /* Logical link not available */
4814 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4815 }
4816}
4817
4818static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4819{
4820 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4821 u8 rsp_result;
4822 if (result == -EINVAL)
4823 rsp_result = L2CAP_MR_BAD_ID;
4824 else
4825 rsp_result = L2CAP_MR_NOT_ALLOWED;
4826
4827 l2cap_send_move_chan_rsp(chan, rsp_result);
4828 }
4829
4830 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4831 chan->move_state = L2CAP_MOVE_STABLE;
4832
4833 /* Restart data transmission */
4834 l2cap_ertm_send(chan);
4835}
4836
a514b17f
AE		 4837/* Invoke with locked chan */
4838void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4839{
770bfefa 4840 u8 local_amp_id = chan->local_amp_id;
fffadc08 4841 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4842
8eb200bd
MM		 4843 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4844 chan, result, local_amp_id, remote_amp_id);
4845
8eb200bd
MM		 4846 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4847 l2cap_chan_unlock(chan);
4848 return;
4849 }
4850
4851 if (chan->state != BT_CONNECTED) {
4852 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4853 } else if (result != L2CAP_MR_SUCCESS) {
4854 l2cap_do_move_cancel(chan, result);
4855 } else {
4856 switch (chan->move_role) {
4857 case L2CAP_MOVE_ROLE_INITIATOR:
4858 l2cap_do_move_initiate(chan, local_amp_id,
4859 remote_amp_id);
4860 break;
4861 case L2CAP_MOVE_ROLE_RESPONDER:
4862 l2cap_do_move_respond(chan, result);
4863 break;
4864 default:
4865 l2cap_do_move_cancel(chan, result);
4866 break;
4867 }
4868 }
8eb200bd
MM		 4869}
4870
8d5a04a1 4871static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4872 struct l2cap_cmd_hdr *cmd,
4873 u16 cmd_len, void *data)
8d5a04a1
MM		 4874{
4875 struct l2cap_move_chan_req *req = data;
1500109b 4876 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4877 struct l2cap_chan *chan;
8d5a04a1
MM		 4878 u16 icid = 0;
4879 u16 result = L2CAP_MR_NOT_ALLOWED;
4880
4881 if (cmd_len != sizeof(*req))
4882 return -EPROTO;
4883
4884 icid = le16_to_cpu(req->icid);
4885
ad0ac6ca 4886 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4887
848566b3 4888 if (!conn->hs_enabled)
8d5a04a1
MM		 4889 return -EINVAL;
4890
02b0fbb9
MM		 4891 chan = l2cap_get_chan_by_dcid(conn, icid);
4892 if (!chan) {
1500109b
MM		 4893 rsp.icid = cpu_to_le16(icid);
4894 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4895 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4896 sizeof(rsp), &rsp);
02b0fbb9
MM		 4897 return 0;
4898 }
4899
1500109b
MM		 4900 chan->ident = cmd->ident;
4901
02b0fbb9
MM		 4902 if (chan->scid < L2CAP_CID_DYN_START ||
4903 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4904 (chan->mode != L2CAP_MODE_ERTM &&
4905 chan->mode != L2CAP_MODE_STREAMING)) {
4906 result = L2CAP_MR_NOT_ALLOWED;
4907 goto send_move_response;
4908 }
4909
4910 if (chan->local_amp_id == req->dest_amp_id) {
4911 result = L2CAP_MR_SAME_ID;
4912 goto send_move_response;
4913 }
4914
6ed971ca 4915 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4916 struct hci_dev *hdev;
4917 hdev = hci_dev_get(req->dest_amp_id);
4918 if (!hdev || hdev->dev_type != HCI_AMP ||
4919 !test_bit(HCI_UP, &hdev->flags)) {
4920 if (hdev)
4921 hci_dev_put(hdev);
4922
4923 result = L2CAP_MR_BAD_ID;
4924 goto send_move_response;
4925 }
4926 hci_dev_put(hdev);
4927 }
4928
4929 /* Detect a move collision. Only send a collision response
4930 * if this side has "lost", otherwise proceed with the move.
4931 * The winner has the larger bd_addr.
4932 */
4933 if ((__chan_is_moving(chan) ||
4934 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4935 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4936 result = L2CAP_MR_COLLISION;
4937 goto send_move_response;
4938 }
4939
02b0fbb9
MM		 4940 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4941 l2cap_move_setup(chan);
4942 chan->move_id = req->dest_amp_id;
4943 icid = chan->dcid;
4944
6ed971ca 4945 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4946 /* Moving to BR/EDR */
4947 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4948 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4949 result = L2CAP_MR_PEND;
4950 } else {
4951 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4952 result = L2CAP_MR_SUCCESS;
4953 }
4954 } else {
4955 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4956 /* Placeholder - uncomment when amp functions are available */
4957 /*amp_accept_physical(chan, req->dest_amp_id);*/
4958 result = L2CAP_MR_PEND;
4959 }
4960
4961send_move_response:
1500109b 4962 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4963
02b0fbb9
MM		 4964 l2cap_chan_unlock(chan);
4965
8d5a04a1
MM		 4966 return 0;
4967}
4968
5b155ef9
MM		 4969static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4970{
4971 struct l2cap_chan *chan;
4972 struct hci_chan *hchan = NULL;
4973
4974 chan = l2cap_get_chan_by_scid(conn, icid);
4975 if (!chan) {
4976 l2cap_send_move_chan_cfm_icid(conn, icid);
4977 return;
4978 }
4979
4980 __clear_chan_timer(chan);
4981 if (result == L2CAP_MR_PEND)
4982 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4983
4984 switch (chan->move_state) {
4985 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4986 /* Move confirm will be sent when logical link
4987 * is complete.
4988 */
4989 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4990 break;
4991 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4992 if (result == L2CAP_MR_PEND) {
4993 break;
4994 } else if (test_bit(CONN_LOCAL_BUSY,
4995 &chan->conn_state)) {
4996 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4997 } else {
4998 /* Logical link is up or moving to BR/EDR,
4999 * proceed with move
5000 */
5001 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
5002 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5003 }
5004 break;
5005 case L2CAP_MOVE_WAIT_RSP:
5006 /* Moving to AMP */
5007 if (result == L2CAP_MR_SUCCESS) {
5008 /* Remote is ready, send confirm immediately
5009 * after logical link is ready
5010 */
5011 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5012 } else {
5013 /* Both logical link and move success
5014 * are required to confirm
5015 */
5016 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5017 }
5018
5019 /* Placeholder - get hci_chan for logical link */
5020 if (!hchan) {
5021 /* Logical link not available */
5022 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5023 break;
5024 }
5025
5026 /* If the logical link is not yet connected, do not
5027 * send confirmation.
5028 */
5029 if (hchan->state != BT_CONNECTED)
5030 break;
5031
5032 /* Logical link is already ready to go */
5033
5034 chan->hs_hcon = hchan->conn;
5035 chan->hs_hcon->l2cap_data = chan->conn;
5036
5037 if (result == L2CAP_MR_SUCCESS) {
5038 /* Can confirm now */
5039 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5040 } else {
5041 /* Now only need move success
5042 * to confirm
5043 */
5044 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5045 }
5046
5047 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5048 break;
5049 default:
5050 /* Any other amp move state means the move failed. */
5051 chan->move_id = chan->local_amp_id;
5052 l2cap_move_done(chan);
5053 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5054 }
5055
5056 l2cap_chan_unlock(chan);
5057}
5058
5059static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5060 u16 result)
5061{
5062 struct l2cap_chan *chan;
5063
5064 chan = l2cap_get_chan_by_ident(conn, ident);
5065 if (!chan) {
5066 /* Could not locate channel, icid is best guess */
5067 l2cap_send_move_chan_cfm_icid(conn, icid);
5068 return;
5069 }
5070
5071 __clear_chan_timer(chan);
5072
5073 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5074 if (result == L2CAP_MR_COLLISION) {
5075 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5076 } else {
5077 /* Cleanup - cancel move */
5078 chan->move_id = chan->local_amp_id;
5079 l2cap_move_done(chan);
5080 }
5081 }
5082
5083 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5084
5085 l2cap_chan_unlock(chan);
5086}
5087
5088static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5089 struct l2cap_cmd_hdr *cmd,
5090 u16 cmd_len, void *data)
8d5a04a1
MM		 5091{
5092 struct l2cap_move_chan_rsp *rsp = data;
5093 u16 icid, result;
5094
5095 if (cmd_len != sizeof(*rsp))
5096 return -EPROTO;
5097
5098 icid = le16_to_cpu(rsp->icid);
5099 result = le16_to_cpu(rsp->result);
5100
ad0ac6ca 5101 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5102
5b155ef9
MM		 5103 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5104 l2cap_move_continue(conn, icid, result);
5105 else
5106 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5107
5108 return 0;
5109}
5110
5f3847a4
MM		 5111static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5112 struct l2cap_cmd_hdr *cmd,
5113 u16 cmd_len, void *data)
8d5a04a1
MM		 5114{
5115 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5116 struct l2cap_chan *chan;
8d5a04a1
MM		 5117 u16 icid, result;
5118
5119 if (cmd_len != sizeof(*cfm))
5120 return -EPROTO;
5121
5122 icid = le16_to_cpu(cfm->icid);
5123 result = le16_to_cpu(cfm->result);
5124
ad0ac6ca 5125 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5126
5f3847a4
MM		 5127 chan = l2cap_get_chan_by_dcid(conn, icid);
5128 if (!chan) {
5129 /* Spec requires a response even if the icid was not found */
5130 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5131 return 0;
5132 }
5133
5134 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5135 if (result == L2CAP_MC_CONFIRMED) {
5136 chan->local_amp_id = chan->move_id;
6ed971ca 5137 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5138 __release_logical_link(chan);
5139 } else {
5140 chan->move_id = chan->local_amp_id;
5141 }
5142
5143 l2cap_move_done(chan);
5144 }
5145
8d5a04a1
MM		 5146 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5147
5f3847a4
MM		 5148 l2cap_chan_unlock(chan);
5149
8d5a04a1
MM		 5150 return 0;
5151}
5152
5153static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5154 struct l2cap_cmd_hdr *cmd,
5155 u16 cmd_len, void *data)
8d5a04a1
MM		 5156{
5157 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5158 struct l2cap_chan *chan;
8d5a04a1
MM		 5159 u16 icid;
5160
5161 if (cmd_len != sizeof(*rsp))
5162 return -EPROTO;
5163
5164 icid = le16_to_cpu(rsp->icid);
5165
ad0ac6ca 5166 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5167
3fd71a0a
MM		 5168 chan = l2cap_get_chan_by_scid(conn, icid);
5169 if (!chan)
5170 return 0;
5171
5172 __clear_chan_timer(chan);
5173
5174 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5175 chan->local_amp_id = chan->move_id;
5176
6ed971ca 5177 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5178 __release_logical_link(chan);
5179
5180 l2cap_move_done(chan);
5181 }
5182
5183 l2cap_chan_unlock(chan);
5184
8d5a04a1
MM		 5185 return 0;
5186}
5187
e2174ca4 5188static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 5189 u16 to_multiplier)
de73115a
CT		 5190{
5191 u16 max_latency;
5192
5193 if (min > max || min < 6 || max > 3200)
5194 return -EINVAL;
5195
5196 if (to_multiplier < 10 || to_multiplier > 3200)
5197 return -EINVAL;
5198
5199 if (max >= to_multiplier * 8)
5200 return -EINVAL;
5201
5202 max_latency = (to_multiplier * 8 / max) - 1;
5203 if (latency > 499 || latency > max_latency)
5204 return -EINVAL;
5205
5206 return 0;
5207}
5208
5209static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5210 struct l2cap_cmd_hdr *cmd,
203e639e 5211 u16 cmd_len, u8 *data)
de73115a
CT		 5212{
5213 struct hci_conn *hcon = conn->hcon;
5214 struct l2cap_conn_param_update_req *req;
5215 struct l2cap_conn_param_update_rsp rsp;
203e639e 5216 u16 min, max, latency, to_multiplier;
2ce603eb 5217 int err;
de73115a
CT		 5218
5219 if (!(hcon->link_mode & HCI_LM_MASTER))
5220 return -EINVAL;
5221
de73115a
CT		 5222 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5223 return -EPROTO;
5224
5225 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5226 min = __le16_to_cpu(req->min);
5227 max = __le16_to_cpu(req->max);
de73115a
CT		 5228 latency = __le16_to_cpu(req->latency);
5229 to_multiplier = __le16_to_cpu(req->to_multiplier);
5230
5231 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5232 min, max, latency, to_multiplier);
de73115a
CT		 5233
5234 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5235
5236 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5237 if (err)
ac73498c 5238 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5239 else
ac73498c 5240 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5241
5242 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5243 sizeof(rsp), &rsp);
de73115a 5244
2ce603eb
CT		 5245 if (!err)
5246 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5247
de73115a
CT		 5248 return 0;
5249}
5250
f1496dee
JH		 5251static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5252 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5253 u8 *data)
5254{
5255 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5256 u16 dcid, mtu, mps, credits, result;
5257 struct l2cap_chan *chan;
5258 int err;
5259
5260 if (cmd_len < sizeof(*rsp))
5261 return -EPROTO;
5262
5263 dcid = __le16_to_cpu(rsp->dcid);
5264 mtu = __le16_to_cpu(rsp->mtu);
5265 mps = __le16_to_cpu(rsp->mps);
5266 credits = __le16_to_cpu(rsp->credits);
5267 result = __le16_to_cpu(rsp->result);
5268
5269 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5270 return -EPROTO;
5271
5272 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5273 dcid, mtu, mps, credits, result);
5274
5275 mutex_lock(&conn->chan_lock);
5276
5277 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5278 if (!chan) {
5279 err = -EBADSLT;
5280 goto unlock;
5281 }
5282
5283 err = 0;
5284
5285 l2cap_chan_lock(chan);
5286
5287 switch (result) {
5288 case L2CAP_CR_SUCCESS:
5289 chan->ident = 0;
5290 chan->dcid = dcid;
5291 chan->omtu = mtu;
5292 chan->remote_mps = mps;
0cd75f7e 5293 chan->tx_credits = credits;
f1496dee
JH		 5294 l2cap_chan_ready(chan);
5295 break;
5296
5297 default:
5298 l2cap_chan_del(chan, ECONNREFUSED);
5299 break;
5300 }
5301
5302 l2cap_chan_unlock(chan);
5303
5304unlock:
5305 mutex_unlock(&conn->chan_lock);
5306
5307 return err;
5308}
5309
3300d9a9 5310static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5311 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5312 u8 *data)
3300d9a9
CT		 5313{
5314 int err = 0;
5315
5316 switch (cmd->code) {
5317 case L2CAP_COMMAND_REJ:
cb3b3152 5318 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5319 break;
5320
5321 case L2CAP_CONN_REQ:
cb3b3152 5322 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5323 break;
5324
5325 case L2CAP_CONN_RSP:
f5a2598d 5326 case L2CAP_CREATE_CHAN_RSP:
9245e737 5327 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5328 break;
5329
5330 case L2CAP_CONF_REQ:
5331 err = l2cap_config_req(conn, cmd, cmd_len, data);
5332 break;
5333
5334 case L2CAP_CONF_RSP:
9245e737 5335 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5336 break;
5337
5338 case L2CAP_DISCONN_REQ:
cb3b3152 5339 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5340 break;
5341
5342 case L2CAP_DISCONN_RSP:
9245e737 5343 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5344 break;
5345
5346 case L2CAP_ECHO_REQ:
5347 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5348 break;
5349
5350 case L2CAP_ECHO_RSP:
5351 break;
5352
5353 case L2CAP_INFO_REQ:
cb3b3152 5354 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5355 break;
5356
5357 case L2CAP_INFO_RSP:
9245e737 5358 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5359 break;
5360
f94ff6ff
MM		 5361 case L2CAP_CREATE_CHAN_REQ:
5362 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5363 break;
5364
8d5a04a1
MM		 5365 case L2CAP_MOVE_CHAN_REQ:
5366 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5367 break;
5368
5369 case L2CAP_MOVE_CHAN_RSP:
9245e737 5370 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5371 break;
5372
5373 case L2CAP_MOVE_CHAN_CFM:
5374 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5375 break;
5376
5377 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5378 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5379 break;
5380
3300d9a9
CT		 5381 default:
5382 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5383 err = -EINVAL;
5384 break;
5385 }
5386
5387 return err;
5388}
5389
27e2d4c8
JH		 5390static int l2cap_le_connect_req(struct l2cap_conn *conn,
5391 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5392 u8 *data)
5393{
5394 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5395 struct l2cap_le_conn_rsp rsp;
5396 struct l2cap_chan *chan, *pchan;
0cd75f7e 5397 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5398 __le16 psm;
5399 u8 result;
5400
5401 if (cmd_len != sizeof(*req))
5402 return -EPROTO;
5403
5404 scid = __le16_to_cpu(req->scid);
5405 mtu = __le16_to_cpu(req->mtu);
5406 mps = __le16_to_cpu(req->mps);
5407 psm = req->psm;
5408 dcid = 0;
0cd75f7e 5409 credits = 0;
27e2d4c8
JH		 5410
5411 if (mtu < 23 || mps < 23)
5412 return -EPROTO;
5413
5414 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5415 scid, mtu, mps);
5416
5417 /* Check if we have socket listening on psm */
5418 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5419 &conn->hcon->dst, LE_LINK);
5420 if (!pchan) {
5421 result = L2CAP_CR_BAD_PSM;
5422 chan = NULL;
5423 goto response;
5424 }
5425
5426 mutex_lock(&conn->chan_lock);
5427 l2cap_chan_lock(pchan);
5428
5429 if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
5430 result = L2CAP_CR_AUTHENTICATION;
5431 chan = NULL;
5432 goto response_unlock;
5433 }
5434
5435 /* Check if we already have channel with that dcid */
5436 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5437 result = L2CAP_CR_NO_MEM;
5438 chan = NULL;
5439 goto response_unlock;
5440 }
5441
5442 chan = pchan->ops->new_connection(pchan);
5443 if (!chan) {
5444 result = L2CAP_CR_NO_MEM;
5445 goto response_unlock;
5446 }
5447
0ce43ce6
JH		 5448 l2cap_le_flowctl_init(chan);
5449
27e2d4c8
JH		 5450 bacpy(&chan->src, &conn->hcon->src);
5451 bacpy(&chan->dst, &conn->hcon->dst);
5452 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
5453 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
5454 chan->psm = psm;
5455 chan->dcid = scid;
5456 chan->omtu = mtu;
5457 chan->remote_mps = mps;
0cd75f7e 5458 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5459
5460 __l2cap_chan_add(conn, chan);
5461 dcid = chan->scid;
0cd75f7e 5462 credits = chan->rx_credits;
27e2d4c8
JH		 5463
5464 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5465
5466 chan->ident = cmd->ident;
5467
5468 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5469 l2cap_state_change(chan, BT_CONNECT2);
5470 result = L2CAP_CR_PEND;
5471 chan->ops->defer(chan);
5472 } else {
5473 l2cap_chan_ready(chan);
5474 result = L2CAP_CR_SUCCESS;
5475 }
5476
5477response_unlock:
5478 l2cap_chan_unlock(pchan);
5479 mutex_unlock(&conn->chan_lock);
5480
5481 if (result == L2CAP_CR_PEND)
5482 return 0;
5483
5484response:
5485 if (chan) {
5486 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5487 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5488 } else {
5489 rsp.mtu = 0;
5490 rsp.mps = 0;
5491 }
5492
5493 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5494 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5495 rsp.result = cpu_to_le16(result);
5496
5497 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5498
5499 return 0;
5500}
5501
fad5fc89
JH		 5502static inline int l2cap_le_credits(struct l2cap_conn *conn,
5503 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5504 u8 *data)
5505{
5506 struct l2cap_le_credits *pkt;
5507 struct l2cap_chan *chan;
0f1bfe4e 5508 u16 cid, credits, max_credits;
fad5fc89
JH		 5509
5510 if (cmd_len != sizeof(*pkt))
5511 return -EPROTO;
5512
5513 pkt = (struct l2cap_le_credits *) data;
5514 cid = __le16_to_cpu(pkt->cid);
5515 credits = __le16_to_cpu(pkt->credits);
5516
5517 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5518
5519 chan = l2cap_get_chan_by_dcid(conn, cid);
5520 if (!chan)
5521 return -EBADSLT;
5522
0f1bfe4e
JH		 5523 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5524 if (credits > max_credits) {
5525 BT_ERR("LE credits overflow");
5526 l2cap_send_disconn_req(chan, ECONNRESET);
5527
5528 /* Return 0 so that we don't trigger an unnecessary
5529 * command reject packet.
5530 */
5531 return 0;
5532 }
5533
fad5fc89
JH		 5534 chan->tx_credits += credits;
5535
5536 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5537 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5538 chan->tx_credits--;
5539 }
5540
5541 if (chan->tx_credits)
5542 chan->ops->resume(chan);
5543
5544 l2cap_chan_unlock(chan);
5545
5546 return 0;
5547}
5548
71fb4197
JH		 5549static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5550 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5551 u8 *data)
5552{
5553 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5554 struct l2cap_chan *chan;
5555
5556 if (cmd_len < sizeof(*rej))
5557 return -EPROTO;
5558
5559 mutex_lock(&conn->chan_lock);
5560
5561 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5562 if (!chan)
5563 goto done;
5564
5565 l2cap_chan_lock(chan);
5566 l2cap_chan_del(chan, ECONNREFUSED);
5567 l2cap_chan_unlock(chan);
5568
5569done:
5570 mutex_unlock(&conn->chan_lock);
5571 return 0;
5572}
5573
3300d9a9 5574static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5575 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5576 u8 *data)
3300d9a9 5577{
b5ecba64
JH		 5578 int err = 0;
5579
3300d9a9
CT		 5580 switch (cmd->code) {
5581 case L2CAP_COMMAND_REJ:
71fb4197 5582 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5583 break;
3300d9a9
CT		 5584
5585 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5586 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5587 break;
3300d9a9
CT		 5588
5589 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5590 break;
3300d9a9 5591
f1496dee
JH		 5592 case L2CAP_LE_CONN_RSP:
5593 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5594 break;
f1496dee 5595
27e2d4c8 5596 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5597 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5598 break;
27e2d4c8 5599
fad5fc89
JH		 5600 case L2CAP_LE_CREDITS:
5601 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5602 break;
5603
3defe01a 5604 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5605 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5606 break;
3defe01a
JH		 5607
5608 case L2CAP_DISCONN_RSP:
5609 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5610 break;
3defe01a 5611
3300d9a9
CT		 5612 default:
5613 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5614 err = -EINVAL;
5615 break;
3300d9a9 5616 }
b5ecba64
JH		 5617
5618 return err;
3300d9a9
CT		 5619}
5620
c5623556
JH		 5621static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5622 struct sk_buff *skb)
5623{
69c4e4e8 5624 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5625 struct l2cap_cmd_hdr *cmd;
5626 u16 len;
c5623556
JH		 5627 int err;
5628
69c4e4e8 5629 if (hcon->type != LE_LINK)
3b166295 5630 goto drop;
69c4e4e8 5631
4f3e219d
MH		 5632 if (skb->len < L2CAP_CMD_HDR_SIZE)
5633 goto drop;
c5623556 5634
4f3e219d
MH		 5635 cmd = (void *) skb->data;
5636 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5637
4f3e219d 5638 len = le16_to_cpu(cmd->len);
c5623556 5639
4f3e219d 5640 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5641
4f3e219d
MH		 5642 if (len != skb->len || !cmd->ident) {
5643 BT_DBG("corrupted command");
5644 goto drop;
5645 }
c5623556 5646
203e639e 5647 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5648 if (err) {
5649 struct l2cap_cmd_rej_unk rej;
c5623556 5650
4f3e219d 5651 BT_ERR("Wrong link type (%d)", err);
c5623556 5652
a521149a 5653 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5654 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5655 sizeof(rej), &rej);
c5623556
JH		 5656 }
5657
3b166295 5658drop:
c5623556
JH		 5659 kfree_skb(skb);
5660}
5661
3300d9a9 5662static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5663 struct sk_buff *skb)
1da177e4 5664{
69c4e4e8 5665 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5666 u8 *data = skb->data;
5667 int len = skb->len;
5668 struct l2cap_cmd_hdr cmd;
3300d9a9 5669 int err;
1da177e4
LT		 5670
5671 l2cap_raw_recv(conn, skb);
5672
69c4e4e8 5673 if (hcon->type != ACL_LINK)
3b166295 5674 goto drop;
69c4e4e8 5675
1da177e4 5676 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5677 u16 cmd_len;
1da177e4
LT		 5678 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5679 data += L2CAP_CMD_HDR_SIZE;
5680 len -= L2CAP_CMD_HDR_SIZE;
5681
88219a0f 5682 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5683
2d792818
GP		 5684 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5685 cmd.ident);
1da177e4 5686
88219a0f 5687 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5688 BT_DBG("corrupted command");
5689 break;
5690 }
5691
c5623556 5692 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5693 if (err) {
e2fd318e 5694 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5695
5696 BT_ERR("Wrong link type (%d)", err);
1da177e4 5697
a521149a 5698 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5699 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5700 sizeof(rej), &rej);
1da177e4
LT		 5701 }
5702
88219a0f
AV		 5703 data += cmd_len;
5704 len -= cmd_len;
1da177e4
LT		 5705 }
5706
3b166295 5707drop:
1da177e4
LT		 5708 kfree_skb(skb);
5709}
5710
47d1ec61 5711static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5712{
5713 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5714 int hdr_size;
5715
5716 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5717 hdr_size = L2CAP_EXT_HDR_SIZE;
5718 else
5719 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5720
47d1ec61 5721 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5722 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5723 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5724 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5725
5726 if (our_fcs != rcv_fcs)
7a560e5c 5727 return -EBADMSG;
fcc203c3
GP		 5728 }
5729 return 0;
5730}
5731
6ea00485 5732static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5733{
e31f7633 5734 struct l2cap_ctrl control;
d5392c8f 5735
e31f7633 5736 BT_DBG("chan %p", chan);
d5392c8f 5737
e31f7633
MM		 5738 memset(&control, 0, sizeof(control));
5739 control.sframe = 1;
5740 control.final = 1;
5741 control.reqseq = chan->buffer_seq;
5742 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5743
e2ab4353 5744 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5745 control.super = L2CAP_SUPER_RNR;
5746 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5747 }
5748
e31f7633
MM		 5749 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5750 chan->unacked_frames > 0)
5751 __set_retrans_timer(chan);
d5392c8f 5752
e31f7633 5753 /* Send pending iframes */
525cd185 5754 l2cap_ertm_send(chan);
d5392c8f 5755
e2ab4353 5756 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5757 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5758 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5759 * send it now.
5760 */
5761 control.super = L2CAP_SUPER_RR;
5762 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5763 }
5764}
5765
2d792818
GP		 5766static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5767 struct sk_buff **last_frag)
18778a63 5768{
84084a31
MM		 5769 /* skb->len reflects data in skb as well as all fragments
5770 * skb->data_len reflects only data in fragments
5771 */
5772 if (!skb_has_frag_list(skb))
5773 skb_shinfo(skb)->frag_list = new_frag;
5774
5775 new_frag->next = NULL;
5776
5777 (*last_frag)->next = new_frag;
5778 *last_frag = new_frag;
5779
5780 skb->len += new_frag->len;
5781 skb->data_len += new_frag->len;
5782 skb->truesize += new_frag->truesize;
5783}
5784
4b51dae9
MM		 5785static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5786 struct l2cap_ctrl *control)
84084a31
MM		 5787{
5788 int err = -EINVAL;
18778a63 5789
4b51dae9 5790 switch (control->sar) {
7e0ef6ee 5791 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5792 if (chan->sdu)
5793 break;
18778a63 5794
80b98027 5795 err = chan->ops->recv(chan, skb);
84084a31 5796 break;
18778a63 5797
7e0ef6ee 5798 case L2CAP_SAR_START:
84084a31
MM		 5799 if (chan->sdu)
5800 break;
18778a63 5801
6f61fd47 5802 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5803 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5804
84084a31
MM		 5805 if (chan->sdu_len > chan->imtu) {
5806 err = -EMSGSIZE;
5807 break;
5808 }
1890d36b 5809
84084a31
MM		 5810 if (skb->len >= chan->sdu_len)
5811 break;
18778a63 5812
84084a31
MM		 5813 chan->sdu = skb;
5814 chan->sdu_last_frag = skb;
18778a63 5815
84084a31
MM		 5816 skb = NULL;
5817 err = 0;
18778a63
GP		 5818 break;
5819
7e0ef6ee 5820 case L2CAP_SAR_CONTINUE:
6f61fd47 5821 if (!chan->sdu)
84084a31 5822 break;
18778a63 5823
84084a31
MM		 5824 append_skb_frag(chan->sdu, skb,
5825 &chan->sdu_last_frag);
5826 skb = NULL;
18778a63 5827
84084a31
MM		 5828 if (chan->sdu->len >= chan->sdu_len)
5829 break;
4178ba46 5830
84084a31 5831 err = 0;
18778a63
GP		 5832 break;
5833
7e0ef6ee 5834 case L2CAP_SAR_END:
6f61fd47 5835 if (!chan->sdu)
84084a31 5836 break;
18778a63 5837
84084a31
MM		 5838 append_skb_frag(chan->sdu, skb,
5839 &chan->sdu_last_frag);
5840 skb = NULL;
4178ba46 5841
84084a31
MM		 5842 if (chan->sdu->len != chan->sdu_len)
5843 break;
18778a63 5844
80b98027 5845 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5846
84084a31
MM		 5847 if (!err) {
5848 /* Reassembly complete */
5849 chan->sdu = NULL;
5850 chan->sdu_last_frag = NULL;
5851 chan->sdu_len = 0;
1890d36b 5852 }
18778a63
GP		 5853 break;
5854 }
5855
84084a31
MM		 5856 if (err) {
5857 kfree_skb(skb);
5858 kfree_skb(chan->sdu);
5859 chan->sdu = NULL;
5860 chan->sdu_last_frag = NULL;
5861 chan->sdu_len = 0;
5862 }
18778a63 5863
84084a31 5864 return err;
18778a63
GP		 5865}
5866
32b32735
MM		 5867static int l2cap_resegment(struct l2cap_chan *chan)
5868{
5869 /* Placeholder */
5870 return 0;
5871}
5872
61aa4f5b 5873void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5874{
61aa4f5b 5875 u8 event;
712132eb 5876
61aa4f5b
MM		 5877 if (chan->mode != L2CAP_MODE_ERTM)
5878 return;
712132eb 5879
61aa4f5b 5880 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5881 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5882}
5883
d2a7ac5d
MM		 5884static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5885{
63838725
MM		 5886 int err = 0;
5887 /* Pass sequential frames to l2cap_reassemble_sdu()
5888 * until a gap is encountered.
5889 */
5890
5891 BT_DBG("chan %p", chan);
5892
5893 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5894 struct sk_buff *skb;
5895 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5896 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5897
5898 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5899
5900 if (!skb)
5901 break;
5902
5903 skb_unlink(skb, &chan->srej_q);
5904 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5905 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5906 if (err)
5907 break;
5908 }
5909
5910 if (skb_queue_empty(&chan->srej_q)) {
5911 chan->rx_state = L2CAP_RX_STATE_RECV;
5912 l2cap_send_ack(chan);
5913 }
5914
5915 return err;
d2a7ac5d
MM		 5916}
5917
5918static void l2cap_handle_srej(struct l2cap_chan *chan,
5919 struct l2cap_ctrl *control)
5920{
f80842a8
MM		 5921 struct sk_buff *skb;
5922
5923 BT_DBG("chan %p, control %p", chan, control);
5924
5925 if (control->reqseq == chan->next_tx_seq) {
5926 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5927 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5928 return;
5929 }
5930
5931 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5932
5933 if (skb == NULL) {
5934 BT_DBG("Seq %d not available for retransmission",
5935 control->reqseq);
5936 return;
5937 }
5938
5939 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5940 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5941 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5942 return;
5943 }
5944
5945 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5946
5947 if (control->poll) {
5948 l2cap_pass_to_tx(chan, control);
5949
5950 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5951 l2cap_retransmit(chan, control);
5952 l2cap_ertm_send(chan);
5953
5954 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5955 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5956 chan->srej_save_reqseq = control->reqseq;
5957 }
5958 } else {
5959 l2cap_pass_to_tx_fbit(chan, control);
5960
5961 if (control->final) {
5962 if (chan->srej_save_reqseq != control->reqseq ||
5963 !test_and_clear_bit(CONN_SREJ_ACT,
5964 &chan->conn_state))
5965 l2cap_retransmit(chan, control);
5966 } else {
5967 l2cap_retransmit(chan, control);
5968 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5969 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5970 chan->srej_save_reqseq = control->reqseq;
5971 }
5972 }
5973 }
d2a7ac5d
MM		 5974}
5975
5976static void l2cap_handle_rej(struct l2cap_chan *chan,
5977 struct l2cap_ctrl *control)
5978{
fcd289df
MM		 5979 struct sk_buff *skb;
5980
5981 BT_DBG("chan %p, control %p", chan, control);
5982
5983 if (control->reqseq == chan->next_tx_seq) {
5984 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5985 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5986 return;
5987 }
5988
5989 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5990
5991 if (chan->max_tx && skb &&
5992 bt_cb(skb)->control.retries >= chan->max_tx) {
5993 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5994 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5995 return;
5996 }
5997
5998 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5999
6000 l2cap_pass_to_tx(chan, control);
6001
6002 if (control->final) {
6003 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6004 l2cap_retransmit_all(chan, control);
6005 } else {
6006 l2cap_retransmit_all(chan, control);
6007 l2cap_ertm_send(chan);
6008 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6009 set_bit(CONN_REJ_ACT, &chan->conn_state);
6010 }
d2a7ac5d
MM		 6011}
6012
4b51dae9
MM		 6013static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6014{
6015 BT_DBG("chan %p, txseq %d", chan, txseq);
6016
6017 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6018 chan->expected_tx_seq);
6019
6020 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6021 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 6022 chan->tx_win) {
4b51dae9
MM		 6023 /* See notes below regarding "double poll" and
6024 * invalid packets.
6025 */
6026 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6027 BT_DBG("Invalid/Ignore - after SREJ");
6028 return L2CAP_TXSEQ_INVALID_IGNORE;
6029 } else {
6030 BT_DBG("Invalid - in window after SREJ sent");
6031 return L2CAP_TXSEQ_INVALID;
6032 }
6033 }
6034
6035 if (chan->srej_list.head == txseq) {
6036 BT_DBG("Expected SREJ");
6037 return L2CAP_TXSEQ_EXPECTED_SREJ;
6038 }
6039
6040 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6041 BT_DBG("Duplicate SREJ - txseq already stored");
6042 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6043 }
6044
6045 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6046 BT_DBG("Unexpected SREJ - not requested");
6047 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6048 }
6049 }
6050
6051 if (chan->expected_tx_seq == txseq) {
6052 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6053 chan->tx_win) {
6054 BT_DBG("Invalid - txseq outside tx window");
6055 return L2CAP_TXSEQ_INVALID;
6056 } else {
6057 BT_DBG("Expected");
6058 return L2CAP_TXSEQ_EXPECTED;
6059 }
6060 }
6061
6062 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6063 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6064 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6065 return L2CAP_TXSEQ_DUPLICATE;
6066 }
6067
6068 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6069 /* A source of invalid packets is a "double poll" condition,
6070 * where delays cause us to send multiple poll packets. If
6071 * the remote stack receives and processes both polls,
6072 * sequence numbers can wrap around in such a way that a
6073 * resent frame has a sequence number that looks like new data
6074 * with a sequence gap. This would trigger an erroneous SREJ
6075 * request.
6076 *
6077 * Fortunately, this is impossible with a tx window that's
6078 * less than half of the maximum sequence number, which allows
6079 * invalid frames to be safely ignored.
6080 *
6081 * With tx window sizes greater than half of the tx window
6082 * maximum, the frame is invalid and cannot be ignored. This
6083 * causes a disconnect.
6084 */
6085
6086 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6087 BT_DBG("Invalid/Ignore - txseq outside tx window");
6088 return L2CAP_TXSEQ_INVALID_IGNORE;
6089 } else {
6090 BT_DBG("Invalid - txseq outside tx window");
6091 return L2CAP_TXSEQ_INVALID;
6092 }
6093 } else {
6094 BT_DBG("Unexpected - txseq indicates missing frames");
6095 return L2CAP_TXSEQ_UNEXPECTED;
6096 }
6097}
6098
d2a7ac5d
MM		 6099static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6100 struct l2cap_ctrl *control,
6101 struct sk_buff *skb, u8 event)
6102{
6103 int err = 0;
941247f9 6104 bool skb_in_use = false;
d2a7ac5d
MM		 6105
6106 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6107 event);
6108
6109 switch (event) {
6110 case L2CAP_EV_RECV_IFRAME:
6111 switch (l2cap_classify_txseq(chan, control->txseq)) {
6112 case L2CAP_TXSEQ_EXPECTED:
6113 l2cap_pass_to_tx(chan, control);
6114
6115 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6116 BT_DBG("Busy, discarding expected seq %d",
6117 control->txseq);
6118 break;
6119 }
6120
6121 chan->expected_tx_seq = __next_seq(chan,
6122 control->txseq);
6123
6124 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6125 skb_in_use = true;
d2a7ac5d
MM		 6126
6127 err = l2cap_reassemble_sdu(chan, skb, control);
6128 if (err)
6129 break;
6130
6131 if (control->final) {
6132 if (!test_and_clear_bit(CONN_REJ_ACT,
6133 &chan->conn_state)) {
6134 control->final = 0;
6135 l2cap_retransmit_all(chan, control);
6136 l2cap_ertm_send(chan);
6137 }
6138 }
6139
6140 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6141 l2cap_send_ack(chan);
6142 break;
6143 case L2CAP_TXSEQ_UNEXPECTED:
6144 l2cap_pass_to_tx(chan, control);
6145
6146 /* Can't issue SREJ frames in the local busy state.
6147 * Drop this frame, it will be seen as missing
6148 * when local busy is exited.
6149 */
6150 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6151 BT_DBG("Busy, discarding unexpected seq %d",
6152 control->txseq);
6153 break;
6154 }
6155
6156 /* There was a gap in the sequence, so an SREJ
6157 * must be sent for each missing frame. The
6158 * current frame is stored for later use.
6159 */
6160 skb_queue_tail(&chan->srej_q, skb);
941247f9 6161 skb_in_use = true;
d2a7ac5d
MM		 6162 BT_DBG("Queued %p (queue len %d)", skb,
6163 skb_queue_len(&chan->srej_q));
6164
6165 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6166 l2cap_seq_list_clear(&chan->srej_list);
6167 l2cap_send_srej(chan, control->txseq);
6168
6169 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6170 break;
6171 case L2CAP_TXSEQ_DUPLICATE:
6172 l2cap_pass_to_tx(chan, control);
6173 break;
6174 case L2CAP_TXSEQ_INVALID_IGNORE:
6175 break;
6176 case L2CAP_TXSEQ_INVALID:
6177 default:
5e4e3972 6178 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6179 break;
6180 }
6181 break;
6182 case L2CAP_EV_RECV_RR:
6183 l2cap_pass_to_tx(chan, control);
6184 if (control->final) {
6185 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6186
e6a3ee6e
MM		 6187 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6188 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6189 control->final = 0;
6190 l2cap_retransmit_all(chan, control);
6191 }
6192
6193 l2cap_ertm_send(chan);
6194 } else if (control->poll) {
6195 l2cap_send_i_or_rr_or_rnr(chan);
6196 } else {
6197 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6198 &chan->conn_state) &&
6199 chan->unacked_frames)
6200 __set_retrans_timer(chan);
6201
6202 l2cap_ertm_send(chan);
6203 }
6204 break;
6205 case L2CAP_EV_RECV_RNR:
6206 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6207 l2cap_pass_to_tx(chan, control);
6208 if (control && control->poll) {
6209 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6210 l2cap_send_rr_or_rnr(chan, 0);
6211 }
6212 __clear_retrans_timer(chan);
6213 l2cap_seq_list_clear(&chan->retrans_list);
6214 break;
6215 case L2CAP_EV_RECV_REJ:
6216 l2cap_handle_rej(chan, control);
6217 break;
6218 case L2CAP_EV_RECV_SREJ:
6219 l2cap_handle_srej(chan, control);
6220 break;
6221 default:
6222 break;
6223 }
6224
6225 if (skb && !skb_in_use) {
6226 BT_DBG("Freeing %p", skb);
6227 kfree_skb(skb);
6228 }
6229
6230 return err;
6231}
6232
6233static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6234 struct l2cap_ctrl *control,
6235 struct sk_buff *skb, u8 event)
6236{
6237 int err = 0;
6238 u16 txseq = control->txseq;
941247f9 6239 bool skb_in_use = false;
d2a7ac5d
MM		 6240
6241 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6242 event);
6243
6244 switch (event) {
6245 case L2CAP_EV_RECV_IFRAME:
6246 switch (l2cap_classify_txseq(chan, txseq)) {
6247 case L2CAP_TXSEQ_EXPECTED:
6248 /* Keep frame for reassembly later */
6249 l2cap_pass_to_tx(chan, control);
6250 skb_queue_tail(&chan->srej_q, skb);
941247f9 6251 skb_in_use = true;
d2a7ac5d
MM		 6252 BT_DBG("Queued %p (queue len %d)", skb,
6253 skb_queue_len(&chan->srej_q));
6254
6255 chan->expected_tx_seq = __next_seq(chan, txseq);
6256 break;
6257 case L2CAP_TXSEQ_EXPECTED_SREJ:
6258 l2cap_seq_list_pop(&chan->srej_list);
6259
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 err = l2cap_rx_queued_iframes(chan);
6267 if (err)
6268 break;
6269
6270 break;
6271 case L2CAP_TXSEQ_UNEXPECTED:
6272 /* Got a frame that can't be reassembled yet.
6273 * Save it for later, and send SREJs to cover
6274 * the missing frames.
6275 */
6276 skb_queue_tail(&chan->srej_q, skb);
941247f9 6277 skb_in_use = true;
d2a7ac5d
MM		 6278 BT_DBG("Queued %p (queue len %d)", skb,
6279 skb_queue_len(&chan->srej_q));
6280
6281 l2cap_pass_to_tx(chan, control);
6282 l2cap_send_srej(chan, control->txseq);
6283 break;
6284 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6285 /* This frame was requested with an SREJ, but
6286 * some expected retransmitted frames are
6287 * missing. Request retransmission of missing
6288 * SREJ'd frames.
6289 */
6290 skb_queue_tail(&chan->srej_q, skb);
941247f9 6291 skb_in_use = true;
d2a7ac5d
MM		 6292 BT_DBG("Queued %p (queue len %d)", skb,
6293 skb_queue_len(&chan->srej_q));
6294
6295 l2cap_pass_to_tx(chan, control);
6296 l2cap_send_srej_list(chan, control->txseq);
6297 break;
6298 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6299 /* We've already queued this frame. Drop this copy. */
6300 l2cap_pass_to_tx(chan, control);
6301 break;
6302 case L2CAP_TXSEQ_DUPLICATE:
6303 /* Expecting a later sequence number, so this frame
6304 * was already received. Ignore it completely.
6305 */
6306 break;
6307 case L2CAP_TXSEQ_INVALID_IGNORE:
6308 break;
6309 case L2CAP_TXSEQ_INVALID:
6310 default:
5e4e3972 6311 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6312 break;
6313 }
6314 break;
6315 case L2CAP_EV_RECV_RR:
6316 l2cap_pass_to_tx(chan, control);
6317 if (control->final) {
6318 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6319
6320 if (!test_and_clear_bit(CONN_REJ_ACT,
6321 &chan->conn_state)) {
6322 control->final = 0;
6323 l2cap_retransmit_all(chan, control);
6324 }
6325
6326 l2cap_ertm_send(chan);
6327 } else if (control->poll) {
6328 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6329 &chan->conn_state) &&
6330 chan->unacked_frames) {
6331 __set_retrans_timer(chan);
6332 }
6333
6334 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6335 l2cap_send_srej_tail(chan);
6336 } else {
6337 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6338 &chan->conn_state) &&
6339 chan->unacked_frames)
6340 __set_retrans_timer(chan);
6341
6342 l2cap_send_ack(chan);
6343 }
6344 break;
6345 case L2CAP_EV_RECV_RNR:
6346 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6347 l2cap_pass_to_tx(chan, control);
6348 if (control->poll) {
6349 l2cap_send_srej_tail(chan);
6350 } else {
6351 struct l2cap_ctrl rr_control;
6352 memset(&rr_control, 0, sizeof(rr_control));
6353 rr_control.sframe = 1;
6354 rr_control.super = L2CAP_SUPER_RR;
6355 rr_control.reqseq = chan->buffer_seq;
6356 l2cap_send_sframe(chan, &rr_control);
6357 }
6358
6359 break;
6360 case L2CAP_EV_RECV_REJ:
6361 l2cap_handle_rej(chan, control);
6362 break;
6363 case L2CAP_EV_RECV_SREJ:
6364 l2cap_handle_srej(chan, control);
6365 break;
6366 }
6367
6368 if (skb && !skb_in_use) {
6369 BT_DBG("Freeing %p", skb);
6370 kfree_skb(skb);
6371 }
6372
6373 return err;
6374}
6375
32b32735
MM		 6376static int l2cap_finish_move(struct l2cap_chan *chan)
6377{
6378 BT_DBG("chan %p", chan);
6379
6380 chan->rx_state = L2CAP_RX_STATE_RECV;
6381
6382 if (chan->hs_hcon)
6383 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6384 else
6385 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6386
6387 return l2cap_resegment(chan);
6388}
6389
6390static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6391 struct l2cap_ctrl *control,
6392 struct sk_buff *skb, u8 event)
6393{
6394 int err;
6395
6396 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6397 event);
6398
6399 if (!control->poll)
6400 return -EPROTO;
6401
6402 l2cap_process_reqseq(chan, control->reqseq);
6403
6404 if (!skb_queue_empty(&chan->tx_q))
6405 chan->tx_send_head = skb_peek(&chan->tx_q);
6406 else
6407 chan->tx_send_head = NULL;
6408
6409 /* Rewind next_tx_seq to the point expected
6410 * by the receiver.
6411 */
6412 chan->next_tx_seq = control->reqseq;
6413 chan->unacked_frames = 0;
6414
6415 err = l2cap_finish_move(chan);
6416 if (err)
6417 return err;
6418
6419 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6420 l2cap_send_i_or_rr_or_rnr(chan);
6421
6422 if (event == L2CAP_EV_RECV_IFRAME)
6423 return -EPROTO;
6424
6425 return l2cap_rx_state_recv(chan, control, NULL, event);
6426}
6427
6428static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6429 struct l2cap_ctrl *control,
6430 struct sk_buff *skb, u8 event)
6431{
6432 int err;
6433
6434 if (!control->final)
6435 return -EPROTO;
6436
6437 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6438
6439 chan->rx_state = L2CAP_RX_STATE_RECV;
6440 l2cap_process_reqseq(chan, control->reqseq);
6441
6442 if (!skb_queue_empty(&chan->tx_q))
6443 chan->tx_send_head = skb_peek(&chan->tx_q);
6444 else
6445 chan->tx_send_head = NULL;
6446
6447 /* Rewind next_tx_seq to the point expected
6448 * by the receiver.
6449 */
6450 chan->next_tx_seq = control->reqseq;
6451 chan->unacked_frames = 0;
6452
6453 if (chan->hs_hcon)
6454 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6455 else
6456 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6457
6458 err = l2cap_resegment(chan);
6459
6460 if (!err)
6461 err = l2cap_rx_state_recv(chan, control, skb, event);
6462
6463 return err;
6464}
6465
d2a7ac5d
MM		 6466static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6467{
6468 /* Make sure reqseq is for a packet that has been sent but not acked */
6469 u16 unacked;
6470
6471 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6472 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6473}
6474
cec8ab6e
MM		 6475static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6476 struct sk_buff *skb, u8 event)
218bb9df 6477{
d2a7ac5d
MM		 6478 int err = 0;
6479
6480 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6481 control, skb, event, chan->rx_state);
6482
6483 if (__valid_reqseq(chan, control->reqseq)) {
6484 switch (chan->rx_state) {
6485 case L2CAP_RX_STATE_RECV:
6486 err = l2cap_rx_state_recv(chan, control, skb, event);
6487 break;
6488 case L2CAP_RX_STATE_SREJ_SENT:
6489 err = l2cap_rx_state_srej_sent(chan, control, skb,
6490 event);
6491 break;
32b32735
MM		 6492 case L2CAP_RX_STATE_WAIT_P:
6493 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6494 break;
6495 case L2CAP_RX_STATE_WAIT_F:
6496 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6497 break;
d2a7ac5d
MM		 6498 default:
6499 /* shut it down */
6500 break;
6501 }
6502 } else {
6503 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6504 control->reqseq, chan->next_tx_seq,
6505 chan->expected_ack_seq);
5e4e3972 6506 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6507 }
6508
6509 return err;
cec8ab6e
MM		 6510}
6511
6512static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6513 struct sk_buff *skb)
6514{
4b51dae9
MM		 6515 int err = 0;
6516
6517 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6518 chan->rx_state);
6519
6520 if (l2cap_classify_txseq(chan, control->txseq) ==
6521 L2CAP_TXSEQ_EXPECTED) {
6522 l2cap_pass_to_tx(chan, control);
6523
6524 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6525 __next_seq(chan, chan->buffer_seq));
6526
6527 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6528
6529 l2cap_reassemble_sdu(chan, skb, control);
6530 } else {
6531 if (chan->sdu) {
6532 kfree_skb(chan->sdu);
6533 chan->sdu = NULL;
6534 }
6535 chan->sdu_last_frag = NULL;
6536 chan->sdu_len = 0;
6537
6538 if (skb) {
6539 BT_DBG("Freeing %p", skb);
6540 kfree_skb(skb);
6541 }
6542 }
6543
6544 chan->last_acked_seq = control->txseq;
6545 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6546
6547 return err;
cec8ab6e
MM		 6548}
6549
6550static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6551{
6552 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6553 u16 len;
6554 u8 event;
218bb9df 6555
b76bbd66
MM		 6556 __unpack_control(chan, skb);
6557
218bb9df
GP		 6558 len = skb->len;
6559
6560 /*
6561 * We can just drop the corrupted I-frame here.
6562 * Receiver will miss it and start proper recovery
cec8ab6e 6563 * procedures and ask for retransmission.
218bb9df 6564 */
47d1ec61 6565 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6566 goto drop;
6567
cec8ab6e 6568 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6569 len -= L2CAP_SDULEN_SIZE;
218bb9df 6570
47d1ec61 6571 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6572 len -= L2CAP_FCS_SIZE;
218bb9df 6573
47d1ec61 6574 if (len > chan->mps) {
5e4e3972 6575 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6576 goto drop;
6577 }
6578
cec8ab6e
MM		 6579 if (!control->sframe) {
6580 int err;
218bb9df 6581
cec8ab6e
MM		 6582 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6583 control->sar, control->reqseq, control->final,
6584 control->txseq);
218bb9df 6585
cec8ab6e
MM		 6586 /* Validate F-bit - F=0 always valid, F=1 only
6587 * valid in TX WAIT_F
6588 */
6589 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6590 goto drop;
cec8ab6e
MM		 6591
6592 if (chan->mode != L2CAP_MODE_STREAMING) {
6593 event = L2CAP_EV_RECV_IFRAME;
6594 err = l2cap_rx(chan, control, skb, event);
6595 } else {
6596 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6597 }
6598
cec8ab6e 6599 if (err)
5e4e3972 6600 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6601 } else {
cec8ab6e
MM		 6602 const u8 rx_func_to_event[4] = {
6603 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6604 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6605 };
6606
6607 /* Only I-frames are expected in streaming mode */
6608 if (chan->mode == L2CAP_MODE_STREAMING)
6609 goto drop;
6610
6611 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6612 control->reqseq, control->final, control->poll,
6613 control->super);
6614
218bb9df 6615 if (len != 0) {
1bb166e6 6616 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6617 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6618 goto drop;
6619 }
6620
cec8ab6e
MM		 6621 /* Validate F and P bits */
6622 if (control->final && (control->poll ||
6623 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6624 goto drop;
6625
6626 event = rx_func_to_event[control->super];
6627 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6628 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6629 }
6630
6631 return 0;
6632
6633drop:
6634 kfree_skb(skb);
6635 return 0;
6636}
6637
b1c325c2
JH		 6638static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6639{
6640 struct l2cap_conn *conn = chan->conn;
6641 struct l2cap_le_credits pkt;
6642 u16 return_credits;
6643
6644 /* We return more credits to the sender only after the amount of
6645 * credits falls below half of the initial amount.
6646 */
f15b8ecf 6647 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6648 return;
6649
f15b8ecf 6650 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6651
6652 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6653
6654 chan->rx_credits += return_credits;
6655
6656 pkt.cid = cpu_to_le16(chan->scid);
6657 pkt.credits = cpu_to_le16(return_credits);
6658
6659 chan->ident = l2cap_get_ident(conn);
6660
6661 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6662}
6663
fad5fc89
JH		 6664static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6665{
aac23bf6
JH		 6666 int err;
6667
6668 if (!chan->rx_credits) {
6669 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6670 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6671 return -ENOBUFS;
aac23bf6 6672 }
fad5fc89 6673
aac23bf6
JH		 6674 if (chan->imtu < skb->len) {
6675 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6676 return -ENOBUFS;
aac23bf6 6677 }
fad5fc89
JH		 6678
6679 chan->rx_credits--;
6680 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6681
6682 l2cap_chan_le_send_credits(chan);
6683
aac23bf6
JH		 6684 err = 0;
6685
6686 if (!chan->sdu) {
6687 u16 sdu_len;
6688
6689 sdu_len = get_unaligned_le16(skb->data);
6690 skb_pull(skb, L2CAP_SDULEN_SIZE);
6691
6692 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6693 sdu_len, skb->len, chan->imtu);
6694
6695 if (sdu_len > chan->imtu) {
6696 BT_ERR("Too big LE L2CAP SDU length received");
6697 err = -EMSGSIZE;
6698 goto failed;
6699 }
6700
6701 if (skb->len > sdu_len) {
6702 BT_ERR("Too much LE L2CAP data received");
6703 err = -EINVAL;
6704 goto failed;
6705 }
6706
6707 if (skb->len == sdu_len)
6708 return chan->ops->recv(chan, skb);
6709
6710 chan->sdu = skb;
6711 chan->sdu_len = sdu_len;
6712 chan->sdu_last_frag = skb;
6713
6714 return 0;
6715 }
6716
6717 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6718 chan->sdu->len, skb->len, chan->sdu_len);
6719
6720 if (chan->sdu->len + skb->len > chan->sdu_len) {
6721 BT_ERR("Too much LE L2CAP data received");
6722 err = -EINVAL;
6723 goto failed;
6724 }
6725
6726 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6727 skb = NULL;
6728
6729 if (chan->sdu->len == chan->sdu_len) {
6730 err = chan->ops->recv(chan, chan->sdu);
6731 if (!err) {
6732 chan->sdu = NULL;
6733 chan->sdu_last_frag = NULL;
6734 chan->sdu_len = 0;
6735 }
6736 }
6737
6738failed:
6739 if (err) {
6740 kfree_skb(skb);
6741 kfree_skb(chan->sdu);
6742 chan->sdu = NULL;
6743 chan->sdu_last_frag = NULL;
6744 chan->sdu_len = 0;
6745 }
6746
6747 /* We can't return an error here since we took care of the skb
6748 * freeing internally. An error return would cause the caller to
6749 * do a double-free of the skb.
6750 */
6751 return 0;
fad5fc89
JH		 6752}
6753
13ca56e0
AE		 6754static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6755 struct sk_buff *skb)
1da177e4 6756{
48454079 6757 struct l2cap_chan *chan;
1da177e4 6758
baa7e1fa 6759 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6760 if (!chan) {
97e8e89d
AE		 6761 if (cid == L2CAP_CID_A2MP) {
6762 chan = a2mp_channel_create(conn, skb);
6763 if (!chan) {
6764 kfree_skb(skb);
13ca56e0 6765 return;
97e8e89d
AE		 6766 }
6767
6768 l2cap_chan_lock(chan);
6769 } else {
6770 BT_DBG("unknown cid 0x%4.4x", cid);
6771 /* Drop packet and return */
6772 kfree_skb(skb);
13ca56e0 6773 return;
97e8e89d 6774 }
1da177e4
LT		 6775 }
6776
49208c9c 6777 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6778
89bc500e 6779 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6780 goto drop;
6781
0c1bc5c6 6782 switch (chan->mode) {
38319713 6783 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6784 if (l2cap_le_data_rcv(chan, skb) < 0)
6785 goto drop;
6786
6787 goto done;
6788
1c2acffb
GP		 6789 case L2CAP_MODE_BASIC:
6790 /* If socket recv buffers overflows we drop data here
6791 * which is *bad* because L2CAP has to be reliable.
6792 * But we don't have any other choice. L2CAP doesn't
6793 * provide flow control mechanism. */
1da177e4 6794
2c96e03d
SJ		 6795 if (chan->imtu < skb->len) {
6796 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6797 goto drop;
2c96e03d 6798 }
1da177e4 6799
80b98027 6800 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6801 goto done;
6802 break;
6803
6804 case L2CAP_MODE_ERTM:
6840ed07 6805 case L2CAP_MODE_STREAMING:
cec8ab6e 6806 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6807 goto done;
6808
1c2acffb 6809 default:
0c1bc5c6 6810 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6811 break;
6812 }
1da177e4
LT		 6813
6814drop:
6815 kfree_skb(skb);
6816
6817done:
6be36555 6818 l2cap_chan_unlock(chan);
1da177e4
LT		 6819}
6820
84104b24
AE		 6821static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6822 struct sk_buff *skb)
1da177e4 6823{
ae4fd2d3 6824 struct hci_conn *hcon = conn->hcon;
23691d75 6825 struct l2cap_chan *chan;
1da177e4 6826
ae4fd2d3
MH		 6827 if (hcon->type != ACL_LINK)
6828 goto drop;
6829
bf20fd4e
JH		 6830 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6831 ACL_LINK);
23691d75 6832 if (!chan)
1da177e4
LT		 6833 goto drop;
6834
5b4cedaa 6835 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6836
89bc500e 6837 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6838 goto drop;
6839
e13e21dc 6840 if (chan->imtu < skb->len)
1da177e4
LT		 6841 goto drop;
6842
2edf870d 6843 /* Store remote BD_ADDR and PSM for msg_name */
06ae3314 6844 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
2edf870d
MH		 6845 bt_cb(skb)->psm = psm;
6846
80b98027 6847 if (!chan->ops->recv(chan, skb))
84104b24 6848 return;
1da177e4
LT		 6849
6850drop:
6851 kfree_skb(skb);
1da177e4
LT		 6852}
6853
72f78356 6854static void l2cap_att_channel(struct l2cap_conn *conn,
6810fca7 6855 struct sk_buff *skb)
9f69bda6 6856{
b99707d7 6857 struct hci_conn *hcon = conn->hcon;
23691d75 6858 struct l2cap_chan *chan;
9f69bda6 6859
b99707d7
MH		 6860 if (hcon->type != LE_LINK)
6861 goto drop;
6862
af1c0134 6863 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
06ae3314 6864 &hcon->src, &hcon->dst);
23691d75 6865 if (!chan)
9f69bda6
GP		 6866 goto drop;
6867
5b4cedaa 6868 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6869
cc8dba2b
MH		 6870 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type))
6871 goto drop;
6872
e13e21dc 6873 if (chan->imtu < skb->len)
9f69bda6
GP		 6874 goto drop;
6875
80b98027 6876 if (!chan->ops->recv(chan, skb))
6810fca7 6877 return;
9f69bda6
GP		 6878
6879drop:
6880 kfree_skb(skb);
9f69bda6
GP		 6881}
6882
1da177e4
LT		 6883static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6884{
6885 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6886 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6887 u16 cid, len;
6888 __le16 psm;
1da177e4 6889
61a939c6
JH		 6890 if (hcon->state != BT_CONNECTED) {
6891 BT_DBG("queueing pending rx skb");
6892 skb_queue_tail(&conn->pending_rx, skb);
6893 return;
6894 }
6895
1da177e4
LT		 6896 skb_pull(skb, L2CAP_HDR_SIZE);
6897 cid = __le16_to_cpu(lh->cid);
6898 len = __le16_to_cpu(lh->len);
6899
1c2acffb
GP		 6900 if (len != skb->len) {
6901 kfree_skb(skb);
6902 return;
6903 }
6904
1da177e4
LT		 6905 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6906
6907 switch (cid) {
8db4dc46 6908 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6909 l2cap_sig_channel(conn, skb);
6910 break;
6911
8db4dc46 6912 case L2CAP_CID_CONN_LESS:
097db76c 6913 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6914 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6915 l2cap_conless_channel(conn, psm, skb);
6916 break;
6917
073d1cf3 6918 case L2CAP_CID_ATT:
72f78356 6919 l2cap_att_channel(conn, skb);
9f69bda6
GP		 6920 break;
6921
a2877629
MH		 6922 case L2CAP_CID_LE_SIGNALING:
6923 l2cap_le_sig_channel(conn, skb);
6924 break;
6925
b501d6a1
AB		 6926 case L2CAP_CID_SMP:
6927 if (smp_sig_channel(conn, skb))
6928 l2cap_conn_del(conn->hcon, EACCES);
6929 break;
6930
18722c24
JR		 6931 case L2CAP_FC_6LOWPAN:
6932 bt_6lowpan_recv(conn, skb);
6933 break;
6934
1da177e4
LT		 6935 default:
6936 l2cap_data_channel(conn, cid, skb);
6937 break;
6938 }
6939}
6940
61a939c6
JH		 6941static void process_pending_rx(struct work_struct *work)
6942{
6943 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6944 pending_rx_work);
6945 struct sk_buff *skb;
6946
6947 BT_DBG("");
6948
6949 while ((skb = skb_dequeue(&conn->pending_rx)))
6950 l2cap_recv_frame(conn, skb);
6951}
6952
162b49e7
JH		 6953static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6954{
6955 struct l2cap_conn *conn = hcon->l2cap_data;
6956 struct hci_chan *hchan;
6957
6958 if (conn)
6959 return conn;
6960
6961 hchan = hci_chan_create(hcon);
6962 if (!hchan)
6963 return NULL;
6964
6965 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
6966 if (!conn) {
6967 hci_chan_del(hchan);
6968 return NULL;
6969 }
6970
6971 kref_init(&conn->ref);
6972 hcon->l2cap_data = conn;
6973 conn->hcon = hcon;
6974 hci_conn_get(conn->hcon);
6975 conn->hchan = hchan;
6976
6977 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6978
6979 switch (hcon->type) {
6980 case LE_LINK:
6981 if (hcon->hdev->le_mtu) {
6982 conn->mtu = hcon->hdev->le_mtu;
6983 break;
6984 }
6985 /* fall through */
6986 default:
6987 conn->mtu = hcon->hdev->acl_mtu;
6988 break;
6989 }
6990
6991 conn->feat_mask = 0;
6992
6993 if (hcon->type == ACL_LINK)
6994 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
6995 &hcon->hdev->dev_flags);
6996
6997 spin_lock_init(&conn->lock);
6998 mutex_init(&conn->chan_lock);
6999
7000 INIT_LIST_HEAD(&conn->chan_l);
7001 INIT_LIST_HEAD(&conn->users);
7002
7003 if (hcon->type == LE_LINK)
7004 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
7005 else
7006 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
7007
61a939c6
JH		 7008 skb_queue_head_init(&conn->pending_rx);
7009 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
7010
162b49e7
JH		 7011 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
7012
7013 return conn;
7014}
7015
7016static bool is_valid_psm(u16 psm, u8 dst_type) {
7017 if (!psm)
7018 return false;
7019
7020 if (bdaddr_type_is_le(dst_type))
7021 return (psm <= 0x00ff);
7022
7023 /* PSM must be odd and lsb of upper byte must be 0 */
7024 return ((psm & 0x0101) == 0x0001);
7025}
7026
7027int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
7028 bdaddr_t *dst, u8 dst_type)
7029{
7030 struct l2cap_conn *conn;
7031 struct hci_conn *hcon;
7032 struct hci_dev *hdev;
7033 __u8 auth_type;
7034 int err;
7035
7036 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7037 dst_type, __le16_to_cpu(psm));
7038
7039 hdev = hci_get_route(dst, &chan->src);
7040 if (!hdev)
7041 return -EHOSTUNREACH;
7042
7043 hci_dev_lock(hdev);
7044
7045 l2cap_chan_lock(chan);
7046
7047 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7048 chan->chan_type != L2CAP_CHAN_RAW) {
7049 err = -EINVAL;
7050 goto done;
7051 }
7052
21626e62
JH		 7053 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7054 err = -EINVAL;
7055 goto done;
7056 }
7057
7058 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 7059 err = -EINVAL;
7060 goto done;
7061 }
7062
7063 switch (chan->mode) {
7064 case L2CAP_MODE_BASIC:
7065 break;
7066 case L2CAP_MODE_LE_FLOWCTL:
7067 l2cap_le_flowctl_init(chan);
7068 break;
7069 case L2CAP_MODE_ERTM:
7070 case L2CAP_MODE_STREAMING:
7071 if (!disable_ertm)
7072 break;
7073 /* fall through */
7074 default:
7075 err = -ENOTSUPP;
7076 goto done;
7077 }
7078
7079 switch (chan->state) {
7080 case BT_CONNECT:
7081 case BT_CONNECT2:
7082 case BT_CONFIG:
7083 /* Already connecting */
7084 err = 0;
7085 goto done;
7086
7087 case BT_CONNECTED:
7088 /* Already connected */
7089 err = -EISCONN;
7090 goto done;
7091
7092 case BT_OPEN:
7093 case BT_BOUND:
7094 /* Can connect */
7095 break;
7096
7097 default:
7098 err = -EBADFD;
7099 goto done;
7100 }
7101
7102 /* Set destination address and psm */
7103 bacpy(&chan->dst, dst);
7104 chan->dst_type = dst_type;
7105
7106 chan->psm = psm;
7107 chan->dcid = cid;
7108
7109 auth_type = l2cap_get_auth_type(chan);
7110
6f77d8c7
AG		 7111 if (bdaddr_type_is_le(dst_type)) {
7112 /* Convert from L2CAP channel address type to HCI address type
7113 */
7114 if (dst_type == BDADDR_LE_PUBLIC)
7115 dst_type = ADDR_LE_DEV_PUBLIC;
7116 else
7117 dst_type = ADDR_LE_DEV_RANDOM;
7118
04a6c589
AG		 7119 hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level,
7120 auth_type);
6f77d8c7 7121 } else {
04a6c589 7122 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7123 }
162b49e7
JH		 7124
7125 if (IS_ERR(hcon)) {
7126 err = PTR_ERR(hcon);
7127 goto done;
7128 }
7129
7130 conn = l2cap_conn_add(hcon);
7131 if (!conn) {
7132 hci_conn_drop(hcon);
7133 err = -ENOMEM;
7134 goto done;
7135 }
7136
7137 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7138 hci_conn_drop(hcon);
7139 err = -EBUSY;
7140 goto done;
7141 }
7142
7143 /* Update source addr of the socket */
7144 bacpy(&chan->src, &hcon->src);
7145 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7146
7147 l2cap_chan_unlock(chan);
7148 l2cap_chan_add(conn, chan);
7149 l2cap_chan_lock(chan);
7150
7151 /* l2cap_chan_add takes its own ref so we can drop this one */
7152 hci_conn_drop(hcon);
7153
7154 l2cap_state_change(chan, BT_CONNECT);
7155 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7156
61202e4d
JH		 7157 /* Release chan->sport so that it can be reused by other
7158 * sockets (as it's only used for listening sockets).
7159 */
7160 write_lock(&chan_list_lock);
7161 chan->sport = 0;
7162 write_unlock(&chan_list_lock);
7163
162b49e7
JH		 7164 if (hcon->state == BT_CONNECTED) {
7165 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7166 __clear_chan_timer(chan);
7167 if (l2cap_chan_check_security(chan))
7168 l2cap_state_change(chan, BT_CONNECTED);
7169 } else
7170 l2cap_do_start(chan);
7171 }
7172
7173 err = 0;
7174
7175done:
7176 l2cap_chan_unlock(chan);
7177 hci_dev_unlock(hdev);
7178 hci_dev_put(hdev);
7179 return err;
7180}
7181
1da177e4
LT		 7182/* ---- L2CAP interface with lower layer (HCI) ---- */
7183
686ebf28 7184int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7185{
7186 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7187 struct l2cap_chan *c;
1da177e4 7188
6ed93dc6 7189 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7190
7191 /* Find listening sockets and check their link_mode */
23691d75
GP		 7192 read_lock(&chan_list_lock);
7193 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7194 if (c->state != BT_LISTEN)
1da177e4
LT		 7195 continue;
7196
7eafc59e 7197 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7198 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7199 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7200 lm1 |= HCI_LM_MASTER;
1da177e4 7201 exact++;
7eafc59e 7202 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7203 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7204 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7205 lm2 |= HCI_LM_MASTER;
7206 }
1da177e4 7207 }
23691d75 7208 read_unlock(&chan_list_lock);
1da177e4
LT		 7209
7210 return exact ? lm1 : lm2;
7211}
7212
9e664631 7213void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7214{
0139418c
MH		 7215 struct l2cap_conn *conn;
7216
6ed93dc6 7217 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7218
1da177e4 7219 if (!status) {
baf43251 7220 conn = l2cap_conn_add(hcon);
1da177e4
LT		 7221 if (conn)
7222 l2cap_conn_ready(conn);
ba6fc317 7223 } else {
e175072f 7224 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 7225 }
1da177e4
LT		 7226}
7227
686ebf28 7228int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7229{
7230 struct l2cap_conn *conn = hcon->l2cap_data;
7231
7232 BT_DBG("hcon %p", hcon);
7233
686ebf28 7234 if (!conn)
9f5a0d7b 7235 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7236 return conn->disc_reason;
7237}
7238
9e664631 7239void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 7240{
7241 BT_DBG("hcon %p reason %d", hcon, reason);
7242
18722c24
JR		 7243 bt_6lowpan_del_conn(hcon->l2cap_data);
7244
e175072f 7245 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7246}
7247
4343478f 7248static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7249{
715ec005 7250 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7251 return;
7252
f62e4323 7253 if (encrypt == 0x00) {
4343478f 7254 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7255 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7256 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7257 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7258 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7259 } else {
4343478f 7260 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7261 __clear_chan_timer(chan);
f62e4323
MH		 7262 }
7263}
7264
686ebf28 7265int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7266{
0139418c 7267 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7268 struct l2cap_chan *chan;
1da177e4 7269
0139418c 7270 if (!conn)
1da177e4 7271 return 0;
0139418c 7272
89d8b407 7273 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7274
160dc6ac 7275 if (hcon->type == LE_LINK) {
35d4adcc 7276 if (!status && encrypt)
4bd6d38e 7277 smp_distribute_keys(conn);
17cd3f37 7278 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 7279 }
7280
3df91ea2 7281 mutex_lock(&conn->chan_lock);
1da177e4 7282
3df91ea2 7283 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7284 l2cap_chan_lock(chan);
1da177e4 7285
89d8b407
AE		 7286 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7287 state_to_string(chan->state));
f1cb9af5 7288
2338a7e0 7289 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7290 l2cap_chan_unlock(chan);
7291 continue;
7292 }
7293
073d1cf3 7294 if (chan->scid == L2CAP_CID_ATT) {
f1cb9af5
VCG		 7295 if (!status && encrypt) {
7296 chan->sec_level = hcon->sec_level;
cf4cd009 7297 l2cap_chan_ready(chan);
f1cb9af5
VCG		 7298 }
7299
6be36555 7300 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 7301 continue;
7302 }
7303
96eff46e 7304 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7305 l2cap_chan_unlock(chan);
6a8d3010
MH		 7306 continue;
7307 }
7308
89bc500e 7309 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7310 chan->state == BT_CONFIG)) {
d97c899b 7311 chan->ops->resume(chan);
4343478f 7312 l2cap_check_encryption(chan, encrypt);
6be36555 7313 l2cap_chan_unlock(chan);
9719f8af
MH		 7314 continue;
7315 }
7316
89bc500e 7317 if (chan->state == BT_CONNECT) {
6d3c15da 7318 if (!status)
93c3e8f5 7319 l2cap_start_connection(chan);
6d3c15da 7320 else
ba13ccd9 7321 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
89bc500e 7322 } else if (chan->state == BT_CONNECT2) {
b1235d79 7323 struct l2cap_conn_rsp rsp;
df3c3931 7324 __u16 res, stat;
1da177e4 7325
b1235d79 7326 if (!status) {
bdc25783 7327 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7328 res = L2CAP_CR_PEND;
7329 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7330 chan->ops->defer(chan);
df3c3931 7331 } else {
acdcabf5 7332 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7333 res = L2CAP_CR_SUCCESS;
7334 stat = L2CAP_CS_NO_INFO;
7335 }
b1235d79 7336 } else {
acdcabf5 7337 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7338 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7339 res = L2CAP_CR_SEC_BLOCK;
7340 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7341 }
7342
fe4128e0
GP		 7343 rsp.scid = cpu_to_le16(chan->dcid);
7344 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7345 rsp.result = cpu_to_le16(res);
7346 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7347 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7348 sizeof(rsp), &rsp);
2d369359
MM		 7349
7350 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7351 res == L2CAP_CR_SUCCESS) {
7352 char buf[128];
7353 set_bit(CONF_REQ_SENT, &chan->conf_state);
7354 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7355 L2CAP_CONF_REQ,
7356 l2cap_build_conf_req(chan, buf),
7357 buf);
7358 chan->num_conf_req++;
7359 }
b1235d79 7360 }
1da177e4 7361
6be36555 7362 l2cap_chan_unlock(chan);
1da177e4
LT		 7363 }
7364
3df91ea2 7365 mutex_unlock(&conn->chan_lock);
b1235d79 7366
1da177e4
LT		 7367 return 0;
7368}
7369
686ebf28 7370int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7371{
7372 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7373 struct l2cap_hdr *hdr;
7374 int len;
1da177e4 7375
1d13a254
AE		 7376 /* For AMP controller do not create l2cap conn */
7377 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7378 goto drop;
1da177e4 7379
5a08ecce 7380 if (!conn)
baf43251 7381 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7382
7383 if (!conn)
1da177e4
LT		 7384 goto drop;
7385
7386 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7387
d73a0988
AE		 7388 switch (flags) {
7389 case ACL_START:
7390 case ACL_START_NO_FLUSH:
7391 case ACL_COMPLETE:
1da177e4
LT		 7392 if (conn->rx_len) {
7393 BT_ERR("Unexpected start frame (len %d)", skb->len);
7394 kfree_skb(conn->rx_skb);
7395 conn->rx_skb = NULL;
7396 conn->rx_len = 0;
7397 l2cap_conn_unreliable(conn, ECOMM);
7398 }
7399
aae7fe22
AE		 7400 /* Start fragment always begin with Basic L2CAP header */
7401 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7402 BT_ERR("Frame is too short (len %d)", skb->len);
7403 l2cap_conn_unreliable(conn, ECOMM);
7404 goto drop;
7405 }
7406
7407 hdr = (struct l2cap_hdr *) skb->data;
7408 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7409
7410 if (len == skb->len) {
7411 /* Complete frame received */
7412 l2cap_recv_frame(conn, skb);
7413 return 0;
7414 }
7415
7416 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7417
7418 if (skb->len > len) {
7419 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7420 skb->len, len);
1da177e4
LT		 7421 l2cap_conn_unreliable(conn, ECOMM);
7422 goto drop;
7423 }
7424
7425 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7426 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7427 if (!conn->rx_skb)
1da177e4
LT		 7428 goto drop;
7429
d626f62b 7430 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7431 skb->len);
1da177e4 7432 conn->rx_len = len - skb->len;
d73a0988
AE		 7433 break;
7434
7435 case ACL_CONT:
1da177e4
LT		 7436 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7437
7438 if (!conn->rx_len) {
7439 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7440 l2cap_conn_unreliable(conn, ECOMM);
7441 goto drop;
7442 }
7443
7444 if (skb->len > conn->rx_len) {
7445 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7446 skb->len, conn->rx_len);
1da177e4
LT		 7447 kfree_skb(conn->rx_skb);
7448 conn->rx_skb = NULL;
7449 conn->rx_len = 0;
7450 l2cap_conn_unreliable(conn, ECOMM);
7451 goto drop;
7452 }
7453
d626f62b 7454 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7455 skb->len);
1da177e4
LT		 7456 conn->rx_len -= skb->len;
7457
7458 if (!conn->rx_len) {
c4e5bafa
JH		 7459 /* Complete frame received. l2cap_recv_frame
7460 * takes ownership of the skb so set the global
7461 * rx_skb pointer to NULL first.
7462 */
7463 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7464 conn->rx_skb = NULL;
c4e5bafa 7465 l2cap_recv_frame(conn, rx_skb);
1da177e4 7466 }
d73a0988 7467 break;
1da177e4
LT		 7468 }
7469
7470drop:
7471 kfree_skb(skb);
7472 return 0;
7473}
7474
aef7d97c 7475static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7476{
23691d75 7477 struct l2cap_chan *c;
1da177e4 7478
333055f2 7479 read_lock(&chan_list_lock);
1da177e4 7480
23691d75 7481 list_for_each_entry(c, &chan_list, global_l) {
fcb73338 7482 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7eafc59e 7483 &c->src, &c->dst,
fcb73338
AE		 7484 c->state, __le16_to_cpu(c->psm),
7485 c->scid, c->dcid, c->imtu, c->omtu,
7486 c->sec_level, c->mode);
61e1b4b7 7487 }
1da177e4 7488
333055f2 7489 read_unlock(&chan_list_lock);
1da177e4 7490
aef7d97c 7491 return 0;
1da177e4
LT		 7492}
7493
aef7d97c
MH		 7494static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7495{
7496 return single_open(file, l2cap_debugfs_show, inode->i_private);
7497}
7498
7499static const struct file_operations l2cap_debugfs_fops = {
7500 .open = l2cap_debugfs_open,
7501 .read = seq_read,
7502 .llseek = seq_lseek,
7503 .release = single_release,
7504};
7505
7506static struct dentry *l2cap_debugfs;
1da177e4 7507
64274518 7508int __init l2cap_init(void)
1da177e4
LT		 7509{
7510 int err;
be9d1227 7511
bb58f747 7512 err = l2cap_init_sockets();
1da177e4
LT		 7513 if (err < 0)
7514 return err;
7515
1120e4bf
MH		 7516 if (IS_ERR_OR_NULL(bt_debugfs))
7517 return 0;
7518
7519 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7520 NULL, &l2cap_debugfs_fops);
1da177e4 7521
f15b8ecf
JH		 7522 debugfs_create_u16("l2cap_le_max_credits", 0466, bt_debugfs,
7523 &le_max_credits);
7524 debugfs_create_u16("l2cap_le_default_mps", 0466, bt_debugfs,
7525 &le_default_mps);
7526
18722c24
JR		 7527 bt_6lowpan_init();
7528
1da177e4 7529 return 0;
1da177e4
LT		 7530}
7531
64274518 7532void l2cap_exit(void)
1da177e4 7533{
18722c24 7534 bt_6lowpan_cleanup();
aef7d97c 7535 debugfs_remove(l2cap_debugfs);
bb58f747 7536 l2cap_cleanup_sockets();
1da177e4
LT		 7537}
7538
d1c4a17d
GP		 7539module_param(disable_ertm, bool, 0644);
7540MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux 6.x block layer and io_uring tree(s)