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Bluetooth: btusb: remove redundant lock variable
[linux-2.6-block.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
422e925b 7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
1da177e4
LT		 8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
8e87d142
YH		 24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 26 SOFTWARE IS DISCLAIMED.
27*/
28
bb58f747 29/* Bluetooth L2CAP core. */
1da177e4 30
1da177e4
LT		 31#include <linux/module.h>
32
aef7d97c 33#include <linux/debugfs.h>
fcc203c3 34#include <linux/crc16.h>
1da177e4
LT		 35
36#include <net/bluetooth/bluetooth.h>
37#include <net/bluetooth/hci_core.h>
38#include <net/bluetooth/l2cap.h>
7ef9fbf0 39
ac4b7236 40#include "smp.h"
7024728e 41#include "a2mp.h"
7ef9fbf0 42#include "amp.h"
1da177e4 43
0f1bfe4e
JH		 44#define LE_FLOWCTL_MAX_CREDITS 65535
45
d1de6d46 46bool disable_ertm;
f0709e03 47
547d1032 48static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
a6801ca9 49static u8 l2cap_fixed_chan[8] = { L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS, };
1da177e4 50
b5ad8b7f
JB		 51static LIST_HEAD(chan_list);
52static DEFINE_RWLOCK(chan_list_lock);
1da177e4 53
f15b8ecf
JH		 54static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
55static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
56
1da177e4 57static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 58 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 59static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 60 void *data);
710f9b0a 61static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 62static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 63
d660366d 64static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 65 struct sk_buff_head *skbs, u8 event);
608bcc6d 66
4f1654e0
MH		 67static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
68{
69 if (hcon->type == LE_LINK) {
70 if (type == ADDR_LE_DEV_PUBLIC)
71 return BDADDR_LE_PUBLIC;
72 else
73 return BDADDR_LE_RANDOM;
74 }
75
76 return BDADDR_BREDR;
77}
78
0139418c 79/* ---- L2CAP channels ---- */
71ba0e56 80
2d792818
GP		 81static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
82 u16 cid)
0139418c 83{
3df91ea2 84 struct l2cap_chan *c;
3d57dc68 85
3df91ea2
AE		 86 list_for_each_entry(c, &conn->chan_l, list) {
87 if (c->dcid == cid)
88 return c;
0139418c 89 }
3df91ea2 90 return NULL;
0139418c
MH		 91}
92
2d792818
GP		 93static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
94 u16 cid)
0139418c 95{
3df91ea2 96 struct l2cap_chan *c;
3d57dc68 97
3df91ea2
AE		 98 list_for_each_entry(c, &conn->chan_l, list) {
99 if (c->scid == cid)
100 return c;
0139418c 101 }
3df91ea2 102 return NULL;
0139418c
MH		 103}
104
105/* Find channel with given SCID.
ef191ade 106 * Returns locked channel. */
2d792818
GP		 107static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
108 u16 cid)
0139418c 109{
48454079 110 struct l2cap_chan *c;
baa7e1fa 111
3df91ea2 112 mutex_lock(&conn->chan_lock);
baa7e1fa 113 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 114 if (c)
115 l2cap_chan_lock(c);
3df91ea2
AE		 116 mutex_unlock(&conn->chan_lock);
117
48454079 118 return c;
0139418c
MH		 119}
120
b1a130b7
MM		 121/* Find channel with given DCID.
122 * Returns locked channel.
123 */
124static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
125 u16 cid)
126{
127 struct l2cap_chan *c;
128
129 mutex_lock(&conn->chan_lock);
130 c = __l2cap_get_chan_by_dcid(conn, cid);
131 if (c)
132 l2cap_chan_lock(c);
133 mutex_unlock(&conn->chan_lock);
134
135 return c;
136}
137
2d792818
GP		 138static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
139 u8 ident)
0139418c 140{
3df91ea2 141 struct l2cap_chan *c;
3d57dc68 142
3df91ea2
AE		 143 list_for_each_entry(c, &conn->chan_l, list) {
144 if (c->ident == ident)
145 return c;
0139418c 146 }
3df91ea2 147 return NULL;
0139418c
MH		 148}
149
5b155ef9
MM		 150static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
151 u8 ident)
152{
153 struct l2cap_chan *c;
154
155 mutex_lock(&conn->chan_lock);
156 c = __l2cap_get_chan_by_ident(conn, ident);
157 if (c)
158 l2cap_chan_lock(c);
159 mutex_unlock(&conn->chan_lock);
160
161 return c;
162}
163
23691d75 164static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 165{
23691d75 166 struct l2cap_chan *c;
9e4425ff 167
23691d75 168 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 169 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 170 return c;
9e4425ff 171 }
250938cb 172 return NULL;
9e4425ff
GP		 173}
174
175int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
176{
73b2ec18
GP		 177 int err;
178
333055f2 179 write_lock(&chan_list_lock);
9e4425ff 180
23691d75 181 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 182 err = -EADDRINUSE;
183 goto done;
9e4425ff
GP		 184 }
185
73b2ec18
GP		 186 if (psm) {
187 chan->psm = psm;
188 chan->sport = psm;
189 err = 0;
190 } else {
191 u16 p;
192
193 err = -EINVAL;
194 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 195 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 196 chan->psm = cpu_to_le16(p);
197 chan->sport = cpu_to_le16(p);
198 err = 0;
199 break;
200 }
201 }
9e4425ff 202
73b2ec18 203done:
333055f2 204 write_unlock(&chan_list_lock);
73b2ec18 205 return err;
9e4425ff 206}
6b8d4a6a 207EXPORT_SYMBOL_GPL(l2cap_add_psm);
9e4425ff
GP		 208
209int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
210{
333055f2 211 write_lock(&chan_list_lock);
9e4425ff 212
14824308
JH		 213 /* Override the defaults (which are for conn-oriented) */
214 chan->omtu = L2CAP_DEFAULT_MTU;
215 chan->chan_type = L2CAP_CHAN_FIXED;
216
9e4425ff
GP		 217 chan->scid = scid;
218
333055f2 219 write_unlock(&chan_list_lock);
9e4425ff
GP		 220
221 return 0;
222}
223
baa7e1fa 224static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 225{
e77af755 226 u16 cid, dyn_end;
0139418c 227
e77af755
JH		 228 if (conn->hcon->type == LE_LINK)
229 dyn_end = L2CAP_CID_LE_DYN_END;
230 else
231 dyn_end = L2CAP_CID_DYN_END;
232
233 for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) {
baa7e1fa 234 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 235 return cid;
236 }
237
238 return 0;
239}
240
f93fa273 241static void l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 242{
42d2d87c 243 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 244 state_to_string(state));
badaaa00 245
89bc500e 246 chan->state = state;
53f52121 247 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 248}
249
f8e73017
GP		 250static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
251 int state, int err)
2e0052e4 252{
f8e73017 253 chan->state = state;
53f52121 254 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 255}
256
257static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
258{
f8e73017 259 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 260}
261
4239d16f
MM		 262static void __set_retrans_timer(struct l2cap_chan *chan)
263{
264 if (!delayed_work_pending(&chan->monitor_timer) &&
265 chan->retrans_timeout) {
266 l2cap_set_timer(chan, &chan->retrans_timer,
267 msecs_to_jiffies(chan->retrans_timeout));
268 }
269}
270
271static void __set_monitor_timer(struct l2cap_chan *chan)
272{
273 __clear_retrans_timer(chan);
274 if (chan->monitor_timeout) {
275 l2cap_set_timer(chan, &chan->monitor_timer,
276 msecs_to_jiffies(chan->monitor_timeout));
277 }
278}
279
608bcc6d
MM		 280static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
281 u16 seq)
282{
283 struct sk_buff *skb;
284
285 skb_queue_walk(head, skb) {
286 if (bt_cb(skb)->control.txseq == seq)
287 return skb;
288 }
289
290 return NULL;
291}
292
3c588192
MM		 293/* ---- L2CAP sequence number lists ---- */
294
295/* For ERTM, ordered lists of sequence numbers must be tracked for
296 * SREJ requests that are received and for frames that are to be
297 * retransmitted. These seq_list functions implement a singly-linked
298 * list in an array, where membership in the list can also be checked
299 * in constant time. Items can also be added to the tail of the list
300 * and removed from the head in constant time, without further memory
301 * allocs or frees.
302 */
303
304static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
305{
306 size_t alloc_size, i;
307
308 /* Allocated size is a power of 2 to map sequence numbers
309 * (which may be up to 14 bits) in to a smaller array that is
310 * sized for the negotiated ERTM transmit windows.
311 */
312 alloc_size = roundup_pow_of_two(size);
313
314 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
315 if (!seq_list->list)
316 return -ENOMEM;
317
318 seq_list->mask = alloc_size - 1;
319 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
320 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
321 for (i = 0; i < alloc_size; i++)
322 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
323
324 return 0;
325}
326
327static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
328{
329 kfree(seq_list->list);
330}
331
332static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
333 u16 seq)
334{
335 /* Constant-time check for list membership */
336 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
337}
338
03a0c5d6 339static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
3c588192 340{
03a0c5d6 341 u16 seq = seq_list->head;
3c588192
MM		 342 u16 mask = seq_list->mask;
343
03a0c5d6
JH		 344 seq_list->head = seq_list->list[seq & mask];
345 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
346
347 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
348 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
349 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192 350 }
3c588192 351
03a0c5d6 352 return seq;
3c588192
MM		 353}
354
355static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
356{
f522ae36 357 u16 i;
3c588192 358
f522ae36
GP		 359 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
360 return;
361
362 for (i = 0; i <= seq_list->mask; i++)
363 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
364
365 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
366 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 367}
368
369static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
370{
371 u16 mask = seq_list->mask;
372
373 /* All appends happen in constant time */
374
f522ae36
GP		 375 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
376 return;
3c588192 377
f522ae36
GP		 378 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
379 seq_list->head = seq;
380 else
381 seq_list->list[seq_list->tail & mask] = seq;
382
383 seq_list->tail = seq;
384 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 385}
386
721c4181 387static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 388{
721c4181 389 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 390 chan_timer.work);
3df91ea2 391 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 392 int reason;
393
e05dcc32 394 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 395
3df91ea2 396 mutex_lock(&conn->chan_lock);
6be36555 397 l2cap_chan_lock(chan);
ab07801d 398
89bc500e 399 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 400 reason = ECONNREFUSED;
89bc500e 401 else if (chan->state == BT_CONNECT &&
2d792818 402 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 403 reason = ECONNREFUSED;
404 else
405 reason = ETIMEDOUT;
406
0f852724 407 l2cap_chan_close(chan, reason);
ab07801d 408
6be36555 409 l2cap_chan_unlock(chan);
ab07801d 410
80b98027 411 chan->ops->close(chan);
3df91ea2
AE		 412 mutex_unlock(&conn->chan_lock);
413
371fd835 414 l2cap_chan_put(chan);
ab07801d
GP		 415}
416
eef1d9b6 417struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 418{
419 struct l2cap_chan *chan;
420
421 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
422 if (!chan)
423 return NULL;
424
c03b355e
AE		 425 mutex_init(&chan->lock);
426
333055f2 427 write_lock(&chan_list_lock);
23691d75 428 list_add(&chan->global_l, &chan_list);
333055f2 429 write_unlock(&chan_list_lock);
23691d75 430
721c4181 431 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 432
89bc500e
GP		 433 chan->state = BT_OPEN;
434
144ad330 435 kref_init(&chan->kref);
71ba0e56 436
2827011f
MM		 437 /* This flag is cleared in l2cap_chan_ready() */
438 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
439
eef1d9b6 440 BT_DBG("chan %p", chan);
abc545b8 441
48454079
GP		 442 return chan;
443}
6b8d4a6a 444EXPORT_SYMBOL_GPL(l2cap_chan_create);
48454079 445
144ad330 446static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 447{
144ad330
SS		 448 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
449
4af66c69
JK		 450 BT_DBG("chan %p", chan);
451
333055f2 452 write_lock(&chan_list_lock);
23691d75 453 list_del(&chan->global_l);
333055f2 454 write_unlock(&chan_list_lock);
23691d75 455
4af66c69 456 kfree(chan);
6ff5abbf
GP		 457}
458
30648372
JK		 459void l2cap_chan_hold(struct l2cap_chan *c)
460{
144ad330 461 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 462
144ad330 463 kref_get(&c->kref);
30648372
JK		 464}
465
466void l2cap_chan_put(struct l2cap_chan *c)
467{
144ad330 468 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 469
144ad330 470 kref_put(&c->kref, l2cap_chan_destroy);
30648372 471}
6b8d4a6a 472EXPORT_SYMBOL_GPL(l2cap_chan_put);
30648372 473
bd4b1653
AE		 474void l2cap_chan_set_defaults(struct l2cap_chan *chan)
475{
476 chan->fcs = L2CAP_FCS_CRC16;
477 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
478 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
479 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
6a5e8165
JR		 480 chan->remote_max_tx = chan->max_tx;
481 chan->remote_tx_win = chan->tx_win;
c20f8e35 482 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653 483 chan->sec_level = BT_SECURITY_LOW;
6a5e8165
JR		 484 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
485 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
486 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
487 chan->conf_state = 0;
bd4b1653
AE		 488
489 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
490}
6b8d4a6a 491EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
bd4b1653 492
0ce43ce6 493static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 494{
0ce43ce6
JH		 495 chan->sdu = NULL;
496 chan->sdu_last_frag = NULL;
497 chan->sdu_len = 0;
0cd75f7e 498 chan->tx_credits = 0;
f15b8ecf 499 chan->rx_credits = le_max_credits;
d1d79413 500 chan->mps = min_t(u16, chan->imtu, le_default_mps);
0ce43ce6
JH		 501
502 skb_queue_head_init(&chan->tx_q);
38319713
JH		 503}
504
93c3e8f5 505void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 506{
af05b30b 507 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 508 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 509
9f5a0d7b 510 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 511
8c1d787b 512 chan->conn = conn;
0139418c 513
5491120e
AE		 514 switch (chan->chan_type) {
515 case L2CAP_CHAN_CONN_ORIENTED:
21626e62
JH		 516 /* Alloc CID for connection-oriented socket */
517 chan->scid = l2cap_alloc_cid(conn);
518 if (conn->hcon->type == ACL_LINK)
0c1bc5c6 519 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 520 break;
521
522 case L2CAP_CHAN_CONN_LESS:
0139418c 523 /* Connectionless socket */
fe4128e0
GP		 524 chan->scid = L2CAP_CID_CONN_LESS;
525 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 526 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 527 break;
528
2338a7e0
JH		 529 case L2CAP_CHAN_FIXED:
530 /* Caller will set CID and CID specific MTU values */
416fa752
AE		 531 break;
532
5491120e 533 default:
0139418c 534 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 535 chan->scid = L2CAP_CID_SIGNALING;
536 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 537 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 538 }
539
8f7975b1
AE		 540 chan->local_id = L2CAP_BESTEFFORT_ID;
541 chan->local_stype = L2CAP_SERV_BESTEFFORT;
542 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
543 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
544 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 545 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 546
371fd835 547 l2cap_chan_hold(chan);
baa7e1fa 548
c16900cf
JH		 549 /* Only keep a reference for fixed channels if they requested it */
550 if (chan->chan_type != L2CAP_CHAN_FIXED ||
551 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
552 hci_conn_hold(conn->hcon);
5ee9891d 553
3df91ea2 554 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 555}
556
466f8004 557void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 558{
559 mutex_lock(&conn->chan_lock);
560 __l2cap_chan_add(conn, chan);
3df91ea2 561 mutex_unlock(&conn->chan_lock);
0139418c
MH		 562}
563
466f8004 564void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 565{
8c1d787b 566 struct l2cap_conn *conn = chan->conn;
0139418c 567
c9b66675 568 __clear_chan_timer(chan);
0139418c 569
49208c9c 570 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 571
72847ce0
JH		 572 chan->ops->teardown(chan, err);
573
8e87d142 574 if (conn) {
56f60984 575 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 576 /* Delete from channel list */
3df91ea2 577 list_del(&chan->list);
3d57dc68 578
371fd835 579 l2cap_chan_put(chan);
baa7e1fa 580
8c1d787b 581 chan->conn = NULL;
3cabbfda 582
c16900cf
JH		 583 /* Reference was only held for non-fixed channels or
584 * fixed channels that explicitly requested it using the
585 * FLAG_HOLD_HCI_CONN flag.
586 */
587 if (chan->chan_type != L2CAP_CHAN_FIXED ||
588 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
76a68ba0 589 hci_conn_drop(conn->hcon);
56f60984
AE		 590
591 if (mgr && mgr->bredr_chan == chan)
592 mgr->bredr_chan = NULL;
0139418c
MH		 593 }
594
419e08c1
AE		 595 if (chan->hs_hchan) {
596 struct hci_chan *hs_hchan = chan->hs_hchan;
597
598 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
599 amp_disconnect_logical_link(hs_hchan);
600 }
601
2827011f 602 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 603 return;
2ead70b8 604
ee556f66
GP		 605 switch(chan->mode) {
606 case L2CAP_MODE_BASIC:
607 break;
c13ffa62 608
38319713 609 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 610 skb_queue_purge(&chan->tx_q);
38319713
JH		 611 break;
612
ee556f66 613 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 614 __clear_retrans_timer(chan);
615 __clear_monitor_timer(chan);
616 __clear_ack_timer(chan);
c13ffa62 617
f1c6775b 618 skb_queue_purge(&chan->srej_q);
c13ffa62 619
3c588192
MM		 620 l2cap_seq_list_free(&chan->srej_list);
621 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 622
623 /* fall through */
624
625 case L2CAP_MODE_STREAMING:
626 skb_queue_purge(&chan->tx_q);
627 break;
c13ffa62 628 }
ee556f66
GP		 629
630 return;
0139418c 631}
6b8d4a6a 632EXPORT_SYMBOL_GPL(l2cap_chan_del);
0139418c 633
f3d82d0c 634static void l2cap_conn_update_id_addr(struct work_struct *work)
387a33e3 635{
f3d82d0c
JH		 636 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
637 id_addr_update_work);
638 struct hci_conn *hcon = conn->hcon;
387a33e3
JH		 639 struct l2cap_chan *chan;
640
641 mutex_lock(&conn->chan_lock);
642
643 list_for_each_entry(chan, &conn->chan_l, list) {
644 l2cap_chan_lock(chan);
645 bacpy(&chan->dst, &hcon->dst);
646 chan->dst_type = bdaddr_type(hcon, hcon->dst_type);
647 l2cap_chan_unlock(chan);
648 }
649
650 mutex_unlock(&conn->chan_lock);
651}
652
27e2d4c8
JH		 653static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
654{
655 struct l2cap_conn *conn = chan->conn;
656 struct l2cap_le_conn_rsp rsp;
657 u16 result;
658
659 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
660 result = L2CAP_CR_AUTHORIZATION;
661 else
662 result = L2CAP_CR_BAD_PSM;
663
664 l2cap_state_change(chan, BT_DISCONN);
665
666 rsp.dcid = cpu_to_le16(chan->scid);
667 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 668 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 669 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 670 rsp.result = cpu_to_le16(result);
671
672 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
673 &rsp);
674}
675
791d60f7
JH		 676static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
677{
678 struct l2cap_conn *conn = chan->conn;
679 struct l2cap_conn_rsp rsp;
680 u16 result;
681
682 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
683 result = L2CAP_CR_SEC_BLOCK;
684 else
685 result = L2CAP_CR_BAD_PSM;
686
687 l2cap_state_change(chan, BT_DISCONN);
688
689 rsp.scid = cpu_to_le16(chan->dcid);
690 rsp.dcid = cpu_to_le16(chan->scid);
691 rsp.result = cpu_to_le16(result);
dcf4adbf 692 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
791d60f7
JH		 693
694 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
695}
696
0f852724 697void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 698{
699 struct l2cap_conn *conn = chan->conn;
4519de9a 700
7eafc59e 701 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 702
89bc500e 703 switch (chan->state) {
4519de9a 704 case BT_LISTEN:
b699ec0d 705 chan->ops->teardown(chan, 0);
4519de9a
GP		 706 break;
707
708 case BT_CONNECTED:
709 case BT_CONFIG:
7b25c9b3 710 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
8d836d71 711 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 712 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 713 } else
714 l2cap_chan_del(chan, reason);
715 break;
716
717 case BT_CONNECT2:
791d60f7
JH		 718 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
719 if (conn->hcon->type == ACL_LINK)
720 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 721 else if (conn->hcon->type == LE_LINK)
722 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 723 }
724
725 l2cap_chan_del(chan, reason);
726 break;
727
728 case BT_CONNECT:
729 case BT_DISCONN:
730 l2cap_chan_del(chan, reason);
731 break;
732
733 default:
b699ec0d 734 chan->ops->teardown(chan, 0);
4519de9a
GP		 735 break;
736 }
737}
6b8d4a6a 738EXPORT_SYMBOL(l2cap_chan_close);
4519de9a 739
4343478f 740static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 741{
6a974b50
MH		 742 switch (chan->chan_type) {
743 case L2CAP_CHAN_RAW:
4343478f 744 switch (chan->sec_level) {
8556edd3 745 case BT_SECURITY_HIGH:
7d513e92 746 case BT_SECURITY_FIPS:
8556edd3
JH		 747 return HCI_AT_DEDICATED_BONDING_MITM;
748 case BT_SECURITY_MEDIUM:
749 return HCI_AT_DEDICATED_BONDING;
750 default:
751 return HCI_AT_NO_BONDING;
752 }
6a974b50 753 break;
3124b843 754 case L2CAP_CHAN_CONN_LESS:
dcf4adbf 755 if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) {
3124b843
MH		 756 if (chan->sec_level == BT_SECURITY_LOW)
757 chan->sec_level = BT_SECURITY_SDP;
758 }
7d513e92
MH		 759 if (chan->sec_level == BT_SECURITY_HIGH ||
760 chan->sec_level == BT_SECURITY_FIPS)
3124b843
MH		 761 return HCI_AT_NO_BONDING_MITM;
762 else
763 return HCI_AT_NO_BONDING;
764 break;
6a974b50 765 case L2CAP_CHAN_CONN_ORIENTED:
dcf4adbf 766 if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) {
6a974b50
MH		 767 if (chan->sec_level == BT_SECURITY_LOW)
768 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 769
7d513e92
MH		 770 if (chan->sec_level == BT_SECURITY_HIGH ||
771 chan->sec_level == BT_SECURITY_FIPS)
6a974b50
MH		 772 return HCI_AT_NO_BONDING_MITM;
773 else
774 return HCI_AT_NO_BONDING;
775 }
776 /* fall through */
777 default:
4343478f 778 switch (chan->sec_level) {
00ae4af9 779 case BT_SECURITY_HIGH:
7d513e92 780 case BT_SECURITY_FIPS:
8556edd3 781 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 782 case BT_SECURITY_MEDIUM:
8556edd3 783 return HCI_AT_GENERAL_BONDING;
00ae4af9 784 default:
8556edd3 785 return HCI_AT_NO_BONDING;
00ae4af9 786 }
6a974b50 787 break;
0684e5f9 788 }
8556edd3
JH		 789}
790
791/* Service level security */
e7cafc45 792int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator)
8556edd3 793{
8c1d787b 794 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 795 __u8 auth_type;
796
a17de2fe
JH		 797 if (conn->hcon->type == LE_LINK)
798 return smp_conn_security(conn->hcon, chan->sec_level);
799
4343478f 800 auth_type = l2cap_get_auth_type(chan);
79d554a6 801
e7cafc45
JH		 802 return hci_conn_security(conn->hcon, chan->sec_level, auth_type,
803 initiator);
79d554a6
MH		 804}
805
b5ad8b7f 806static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 807{
808 u8 id;
809
810 /* Get next available identificator.
811 * 1 - 128 are used by kernel.
812 * 129 - 199 are reserved.
813 * 200 - 254 are used by utilities like l2ping, etc.
814 */
815
5a54e7c8 816 mutex_lock(&conn->ident_lock);
4e8402a3
MH		 817
818 if (++conn->tx_ident > 128)
819 conn->tx_ident = 1;
820
821 id = conn->tx_ident;
822
5a54e7c8 823 mutex_unlock(&conn->ident_lock);
4e8402a3
MH		 824
825 return id;
826}
827
2d792818
GP		 828static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
829 void *data)
4e8402a3
MH		 830{
831 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 832 u8 flags;
4e8402a3
MH		 833
834 BT_DBG("code 0x%2.2x", code);
835
836 if (!skb)
9a9c6a34 837 return;
4e8402a3 838
e702112f
AE		 839 if (lmp_no_flush_capable(conn->hcon->hdev))
840 flags = ACL_START_NO_FLUSH;
841 else
842 flags = ACL_START;
843
14b12d0b 844 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 845 skb->priority = HCI_PRIO_MAX;
14b12d0b 846
73d80deb
LAD		 847 hci_send_acl(conn->hchan, skb, flags);
848}
849
02b0fbb9
MM		 850static bool __chan_is_moving(struct l2cap_chan *chan)
851{
852 return chan->move_state != L2CAP_MOVE_STABLE &&
853 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
854}
855
73d80deb
LAD		 856static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
857{
858 struct hci_conn *hcon = chan->conn->hcon;
859 u16 flags;
860
861 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 862 skb->priority);
73d80deb 863
d5f8a75d
MM		 864 if (chan->hs_hcon && !__chan_is_moving(chan)) {
865 if (chan->hs_hchan)
866 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
867 else
868 kfree_skb(skb);
869
870 return;
871 }
872
73d80deb 873 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 874 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 875 flags = ACL_START_NO_FLUSH;
876 else
877 flags = ACL_START;
14b12d0b 878
73d80deb
LAD		 879 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
880 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 881}
882
b76bbd66
MM		 883static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
884{
885 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
886 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
887
888 if (enh & L2CAP_CTRL_FRAME_TYPE) {
889 /* S-Frame */
890 control->sframe = 1;
891 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
892 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
893
894 control->sar = 0;
895 control->txseq = 0;
896 } else {
897 /* I-Frame */
898 control->sframe = 0;
899 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
900 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
901
902 control->poll = 0;
903 control->super = 0;
904 }
905}
906
b76bbd66
MM		 907static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
908{
909 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
910 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
911
912 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
913 /* S-Frame */
914 control->sframe = 1;
915 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
916 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
917
918 control->sar = 0;
919 control->txseq = 0;
920 } else {
921 /* I-Frame */
922 control->sframe = 0;
923 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
924 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
925
926 control->poll = 0;
927 control->super = 0;
928 }
929}
930
931static inline void __unpack_control(struct l2cap_chan *chan,
932 struct sk_buff *skb)
933{
934 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
935 __unpack_extended_control(get_unaligned_le32(skb->data),
936 &bt_cb(skb)->control);
cec8ab6e 937 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 938 } else {
939 __unpack_enhanced_control(get_unaligned_le16(skb->data),
940 &bt_cb(skb)->control);
cec8ab6e 941 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 942 }
943}
944
b5c6aaed
MM		 945static u32 __pack_extended_control(struct l2cap_ctrl *control)
946{
947 u32 packed;
948
949 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
950 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
951
952 if (control->sframe) {
953 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
954 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
955 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
956 } else {
957 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
958 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
959 }
960
961 return packed;
962}
963
964static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
965{
966 u16 packed;
967
968 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
969 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
970
971 if (control->sframe) {
972 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
973 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
974 packed |= L2CAP_CTRL_FRAME_TYPE;
975 } else {
976 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
977 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
978 }
979
980 return packed;
981}
982
b76bbd66
MM		 983static inline void __pack_control(struct l2cap_chan *chan,
984 struct l2cap_ctrl *control,
985 struct sk_buff *skb)
986{
987 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
988 put_unaligned_le32(__pack_extended_control(control),
989 skb->data + L2CAP_HDR_SIZE);
990 } else {
991 put_unaligned_le16(__pack_enhanced_control(control),
992 skb->data + L2CAP_HDR_SIZE);
993 }
994}
995
ba7aa64f
GP		 996static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
997{
998 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
999 return L2CAP_EXT_HDR_SIZE;
1000 else
1001 return L2CAP_ENH_HDR_SIZE;
1002}
1003
a67d7f6f
MM		 1004static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
1005 u32 control)
b5c6aaed
MM		 1006{
1007 struct sk_buff *skb;
1008 struct l2cap_hdr *lh;
ba7aa64f 1009 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 1010
1011 if (chan->fcs == L2CAP_FCS_CRC16)
1012 hlen += L2CAP_FCS_SIZE;
1013
a67d7f6f 1014 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 1015
b5c6aaed 1016 if (!skb)
a67d7f6f 1017 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 1018
1019 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1020 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1021 lh->cid = cpu_to_le16(chan->dcid);
1022
a67d7f6f
MM		 1023 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1024 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1025 else
1026 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 1027
1028 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 1029 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 1030 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1031 }
1032
1033 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 1034 return skb;
1035}
1036
1037static void l2cap_send_sframe(struct l2cap_chan *chan,
1038 struct l2cap_ctrl *control)
1039{
1040 struct sk_buff *skb;
1041 u32 control_field;
1042
1043 BT_DBG("chan %p, control %p", chan, control);
1044
1045 if (!control->sframe)
1046 return;
1047
b99e13ad
MM		 1048 if (__chan_is_moving(chan))
1049 return;
1050
a67d7f6f
MM		 1051 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1052 !control->poll)
1053 control->final = 1;
1054
1055 if (control->super == L2CAP_SUPER_RR)
1056 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1057 else if (control->super == L2CAP_SUPER_RNR)
1058 set_bit(CONN_RNR_SENT, &chan->conn_state);
1059
1060 if (control->super != L2CAP_SUPER_SREJ) {
1061 chan->last_acked_seq = control->reqseq;
1062 __clear_ack_timer(chan);
1063 }
1064
1065 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1066 control->final, control->poll, control->super);
1067
1068 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1069 control_field = __pack_extended_control(control);
1070 else
1071 control_field = __pack_enhanced_control(control);
1072
1073 skb = l2cap_create_sframe_pdu(chan, control_field);
1074 if (!IS_ERR(skb))
1075 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1076}
1077
c9e3d5e0 1078static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1079{
c9e3d5e0
MM		 1080 struct l2cap_ctrl control;
1081
1082 BT_DBG("chan %p, poll %d", chan, poll);
1083
1084 memset(&control, 0, sizeof(control));
1085 control.sframe = 1;
1086 control.poll = poll;
1087
1088 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1089 control.super = L2CAP_SUPER_RNR;
1090 else
1091 control.super = L2CAP_SUPER_RR;
b5c6aaed 1092
c9e3d5e0
MM		 1093 control.reqseq = chan->buffer_seq;
1094 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1095}
1096
b4450035 1097static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1098{
5ff6f34d
JH		 1099 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
1100 return true;
1101
c1360a1c 1102 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1103}
1104
1df7b17a 1105static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1106{
1df7b17a 1107 struct l2cap_conn *conn = chan->conn;
80d58d0b 1108 struct hci_dev *hdev;
1df7b17a
MH		 1109 bool amp_available = false;
1110
1111 if (!conn->hs_enabled)
1112 return false;
1113
1114 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1115 return false;
80d58d0b
MH		 1116
1117 read_lock(&hci_dev_list_lock);
1df7b17a 1118 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1119 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1120 test_bit(HCI_UP, &hdev->flags)) {
1121 amp_available = true;
1122 break;
1123 }
1124 }
80d58d0b
MH		 1125 read_unlock(&hci_dev_list_lock);
1126
1df7b17a
MH		 1127 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1128 return amp_available;
848566b3
MH		 1129
1130 return false;
93c3e8f5
AE		 1131}
1132
5ce66b59
AE		 1133static bool l2cap_check_efs(struct l2cap_chan *chan)
1134{
1135 /* Check EFS parameters */
1136 return true;
1137}
1138
2766be48 1139void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1140{
1141 struct l2cap_conn *conn = chan->conn;
1142 struct l2cap_conn_req req;
1143
1144 req.scid = cpu_to_le16(chan->scid);
1145 req.psm = chan->psm;
1146
1147 chan->ident = l2cap_get_ident(conn);
1148
1149 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1150
1151 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1152}
1153
8eb200bd
MM		 1154static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1155{
1156 struct l2cap_create_chan_req req;
1157 req.scid = cpu_to_le16(chan->scid);
1158 req.psm = chan->psm;
1159 req.amp_id = amp_id;
1160
1161 chan->ident = l2cap_get_ident(chan->conn);
1162
1163 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1164 sizeof(req), &req);
1165}
1166
02b0fbb9
MM		 1167static void l2cap_move_setup(struct l2cap_chan *chan)
1168{
1169 struct sk_buff *skb;
1170
1171 BT_DBG("chan %p", chan);
1172
1173 if (chan->mode != L2CAP_MODE_ERTM)
1174 return;
1175
1176 __clear_retrans_timer(chan);
1177 __clear_monitor_timer(chan);
1178 __clear_ack_timer(chan);
1179
1180 chan->retry_count = 0;
1181 skb_queue_walk(&chan->tx_q, skb) {
1182 if (bt_cb(skb)->control.retries)
1183 bt_cb(skb)->control.retries = 1;
1184 else
1185 break;
1186 }
1187
1188 chan->expected_tx_seq = chan->buffer_seq;
1189
1190 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1191 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1192 l2cap_seq_list_clear(&chan->retrans_list);
1193 l2cap_seq_list_clear(&chan->srej_list);
1194 skb_queue_purge(&chan->srej_q);
1195
1196 chan->tx_state = L2CAP_TX_STATE_XMIT;
1197 chan->rx_state = L2CAP_RX_STATE_MOVE;
1198
1199 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1200}
1201
5f3847a4
MM		 1202static void l2cap_move_done(struct l2cap_chan *chan)
1203{
1204 u8 move_role = chan->move_role;
1205 BT_DBG("chan %p", chan);
1206
1207 chan->move_state = L2CAP_MOVE_STABLE;
1208 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1209
1210 if (chan->mode != L2CAP_MODE_ERTM)
1211 return;
1212
1213 switch (move_role) {
1214 case L2CAP_MOVE_ROLE_INITIATOR:
1215 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1216 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1217 break;
1218 case L2CAP_MOVE_ROLE_RESPONDER:
1219 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1220 break;
1221 }
1222}
1223
9f0caeb1
VCG		 1224static void l2cap_chan_ready(struct l2cap_chan *chan)
1225{
2827011f 1226 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1227 chan->conf_state = 0;
1228 __clear_chan_timer(chan);
1229
0ce43ce6
JH		 1230 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1231 chan->ops->suspend(chan);
177f8f2b 1232
54a59aa2 1233 chan->state = BT_CONNECTED;
9f0caeb1 1234
fd83e2c2 1235 chan->ops->ready(chan);
9f0caeb1
VCG		 1236}
1237
f1496dee
JH		 1238static void l2cap_le_connect(struct l2cap_chan *chan)
1239{
1240 struct l2cap_conn *conn = chan->conn;
1241 struct l2cap_le_conn_req req;
1242
595177f3
JH		 1243 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1244 return;
1245
f1496dee
JH		 1246 req.psm = chan->psm;
1247 req.scid = cpu_to_le16(chan->scid);
1248 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1249 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1250 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1251
1252 chan->ident = l2cap_get_ident(conn);
1253
1254 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1255 sizeof(req), &req);
1256}
1257
1258static void l2cap_le_start(struct l2cap_chan *chan)
1259{
1260 struct l2cap_conn *conn = chan->conn;
1261
1262 if (!smp_conn_security(conn->hcon, chan->sec_level))
1263 return;
1264
1265 if (!chan->psm) {
1266 l2cap_chan_ready(chan);
1267 return;
1268 }
1269
1270 if (chan->state == BT_CONNECT)
1271 l2cap_le_connect(chan);
1272}
1273
93c3e8f5
AE		 1274static void l2cap_start_connection(struct l2cap_chan *chan)
1275{
1276 if (__amp_capable(chan)) {
1277 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1278 a2mp_discover_amp(chan);
f1496dee
JH		 1279 } else if (chan->conn->hcon->type == LE_LINK) {
1280 l2cap_le_start(chan);
93c3e8f5
AE		 1281 } else {
1282 l2cap_send_conn_req(chan);
1283 }
1284}
1285
aeaeb4bb
JH		 1286static void l2cap_request_info(struct l2cap_conn *conn)
1287{
1288 struct l2cap_info_req req;
1289
1290 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1291 return;
1292
1293 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1294
1295 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1296 conn->info_ident = l2cap_get_ident(conn);
1297
1298 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1299
1300 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1301 sizeof(req), &req);
1302}
1303
fc7f8a7e 1304static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1305{
8c1d787b 1306 struct l2cap_conn *conn = chan->conn;
79d554a6 1307
9f0caeb1 1308 if (conn->hcon->type == LE_LINK) {
96ac34fb 1309 l2cap_le_start(chan);
9f0caeb1
VCG		 1310 return;
1311 }
1312
aeaeb4bb
JH		 1313 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) {
1314 l2cap_request_info(conn);
1315 return;
1316 }
79d554a6 1317
aeaeb4bb
JH		 1318 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1319 return;
79d554a6 1320
aeaeb4bb
JH		 1321 if (l2cap_chan_check_security(chan, true) &&
1322 __l2cap_no_conn_pending(chan))
1323 l2cap_start_connection(chan);
79d554a6
MH		 1324}
1325
cf6c2c0b
GP		 1326static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1327{
1328 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1329 if (!disable_ertm)
cf6c2c0b
GP		 1330 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1331
1332 switch (mode) {
1333 case L2CAP_MODE_ERTM:
1334 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1335 case L2CAP_MODE_STREAMING:
1336 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1337 default:
1338 return 0x00;
1339 }
1340}
1341
5e4e3972 1342static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1343{
5e4e3972 1344 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1345 struct l2cap_disconn_req req;
1346
c13ffa62
GP		 1347 if (!conn)
1348 return;
1349
aad3d0e3 1350 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1351 __clear_retrans_timer(chan);
1352 __clear_monitor_timer(chan);
1353 __clear_ack_timer(chan);
c13ffa62
GP		 1354 }
1355
2338a7e0 1356 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1357 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1358 return;
1359 }
1360
fe4128e0
GP		 1361 req.dcid = cpu_to_le16(chan->dcid);
1362 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1363 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1364 sizeof(req), &req);
c13ffa62 1365
f8e73017 1366 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1367}
1368
1da177e4 1369/* ---- L2CAP connections ---- */
4e8402a3
MH		 1370static void l2cap_conn_start(struct l2cap_conn *conn)
1371{
3df91ea2 1372 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1373
1374 BT_DBG("conn %p", conn);
1375
3df91ea2 1376 mutex_lock(&conn->chan_lock);
4e8402a3 1377
3df91ea2 1378 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1379 l2cap_chan_lock(chan);
4e8402a3 1380
715ec005 1381 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb 1382 l2cap_chan_ready(chan);
6be36555 1383 l2cap_chan_unlock(chan);
79d554a6
MH		 1384 continue;
1385 }
1386
89bc500e 1387 if (chan->state == BT_CONNECT) {
e7cafc45 1388 if (!l2cap_chan_check_security(chan, true) ||
2d792818 1389 !__l2cap_no_conn_pending(chan)) {
6be36555 1390 l2cap_chan_unlock(chan);
47731de7
GP		 1391 continue;
1392 }
79d554a6 1393
c1360a1c 1394 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1395 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1396 &chan->conf_state)) {
89bc500e 1397 l2cap_chan_close(chan, ECONNRESET);
6be36555 1398 l2cap_chan_unlock(chan);
47731de7 1399 continue;
b1235d79 1400 }
47731de7 1401
93c3e8f5 1402 l2cap_start_connection(chan);
47731de7 1403
89bc500e 1404 } else if (chan->state == BT_CONNECT2) {
79d554a6 1405 struct l2cap_conn_rsp rsp;
e9aeb2dd 1406 char buf[128];
fe4128e0
GP		 1407 rsp.scid = cpu_to_le16(chan->dcid);
1408 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1409
e7cafc45 1410 if (l2cap_chan_check_security(chan, false)) {
bdc25783 1411 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
dcf4adbf
JP		 1412 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1413 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1414 chan->ops->defer(chan);
f66dc81f
MH		 1415
1416 } else {
acdcabf5 1417 l2cap_state_change(chan, BT_CONFIG);
dcf4adbf
JP		 1418 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1419 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1420 }
79d554a6 1421 } else {
dcf4adbf
JP		 1422 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1423 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1424 }
1425
fc7f8a7e 1426 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1427 sizeof(rsp), &rsp);
e9aeb2dd 1428
c1360a1c 1429 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1430 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1431 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1432 continue;
1433 }
1434
c1360a1c 1435 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1436 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1437 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1438 chan->num_conf_req++;
4e8402a3
MH		 1439 }
1440
6be36555 1441 l2cap_chan_unlock(chan);
4e8402a3
MH		 1442 }
1443
3df91ea2 1444 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1445}
1446
b62f328b
VT		 1447static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1448{
cc8dba2b 1449 struct hci_conn *hcon = conn->hcon;
dcc36c16 1450 struct hci_dev *hdev = hcon->hdev;
b62f328b 1451
e760ec12 1452 BT_DBG("%s conn %p", hdev->name, conn);
b62f328b 1453
e760ec12
JH		 1454 /* For outgoing pairing which doesn't necessarily have an
1455 * associated socket (e.g. mgmt_pair_device).
1456 */
1457 if (hcon->out)
1458 smp_conn_security(hcon, hcon->pending_sec_level);
cc8dba2b 1459
80afeb6c
MH		 1460 /* For LE slave connections, make sure the connection interval
1461 * is in the range of the minium and maximum interval that has
1462 * been configured for this connection. If not, then trigger
1463 * the connection update procedure.
1464 */
40bef302 1465 if (hcon->role == HCI_ROLE_SLAVE &&
80afeb6c
MH		 1466 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1467 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1468 struct l2cap_conn_param_update_req req;
1469
1470 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1471 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1472 req.latency = cpu_to_le16(hcon->le_conn_latency);
1473 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1474
1475 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1476 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1477 }
b62f328b
VT		 1478}
1479
4e8402a3
MH		 1480static void l2cap_conn_ready(struct l2cap_conn *conn)
1481{
48454079 1482 struct l2cap_chan *chan;
cc110922 1483 struct hci_conn *hcon = conn->hcon;
4e8402a3 1484
79d554a6 1485 BT_DBG("conn %p", conn);
4e8402a3 1486
aeaeb4bb
JH		 1487 if (hcon->type == ACL_LINK)
1488 l2cap_request_info(conn);
1489
e760ec12
JH		 1490 mutex_lock(&conn->chan_lock);
1491
3df91ea2 1492 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1493
6be36555 1494 l2cap_chan_lock(chan);
4e8402a3 1495
2338a7e0 1496 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1497 l2cap_chan_unlock(chan);
1498 continue;
1499 }
1500
cc110922 1501 if (hcon->type == LE_LINK) {
f1496dee 1502 l2cap_le_start(chan);
63128451 1503 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb
JH		 1504 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
1505 l2cap_chan_ready(chan);
1c244f79 1506 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1507 l2cap_do_start(chan);
1c244f79 1508 }
4e8402a3 1509
6be36555 1510 l2cap_chan_unlock(chan);
4e8402a3 1511 }
79d554a6 1512
3df91ea2 1513 mutex_unlock(&conn->chan_lock);
61a939c6 1514
79a05727
JH		 1515 if (hcon->type == LE_LINK)
1516 l2cap_le_conn_ready(conn);
1517
61a939c6 1518 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1519}
1520
1521/* Notify sockets that we cannot guaranty reliability anymore */
1522static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1523{
48454079 1524 struct l2cap_chan *chan;
4e8402a3
MH		 1525
1526 BT_DBG("conn %p", conn);
1527
3df91ea2 1528 mutex_lock(&conn->chan_lock);
4e8402a3 1529
3df91ea2 1530 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1531 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1532 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1533 }
1534
3df91ea2 1535 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1536}
1537
f878fcad 1538static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1539{
f878fcad 1540 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1541 info_timer.work);
4e8402a3 1542
984947dc 1543 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1544 conn->info_ident = 0;
984947dc 1545
4e8402a3
MH		 1546 l2cap_conn_start(conn);
1547}
1548
2c8e1411
DH		 1549/*
1550 * l2cap_user
1551 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1552 * callback is called during registration. The ->remove callback is called
1553 * during unregistration.
1554 * An l2cap_user object can either be explicitly unregistered or when the
1555 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1556 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1557 * External modules must own a reference to the l2cap_conn object if they intend
1558 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1559 * any time if they don't.
1560 */
1561
1562int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1563{
1564 struct hci_dev *hdev = conn->hcon->hdev;
1565 int ret;
1566
1567 /* We need to check whether l2cap_conn is registered. If it is not, we
1568 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1569 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1570 * relies on the parent hci_conn object to be locked. This itself relies
1571 * on the hci_dev object to be locked. So we must lock the hci device
1572 * here, too. */
1573
1574 hci_dev_lock(hdev);
1575
1576 if (user->list.next || user->list.prev) {
1577 ret = -EINVAL;
1578 goto out_unlock;
1579 }
1580
1581 /* conn->hchan is NULL after l2cap_conn_del() was called */
1582 if (!conn->hchan) {
1583 ret = -ENODEV;
1584 goto out_unlock;
1585 }
1586
1587 ret = user->probe(conn, user);
1588 if (ret)
1589 goto out_unlock;
1590
1591 list_add(&user->list, &conn->users);
1592 ret = 0;
1593
1594out_unlock:
1595 hci_dev_unlock(hdev);
1596 return ret;
1597}
1598EXPORT_SYMBOL(l2cap_register_user);
1599
1600void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1601{
1602 struct hci_dev *hdev = conn->hcon->hdev;
1603
1604 hci_dev_lock(hdev);
1605
1606 if (!user->list.next || !user->list.prev)
1607 goto out_unlock;
1608
1609 list_del(&user->list);
1610 user->list.next = NULL;
1611 user->list.prev = NULL;
1612 user->remove(conn, user);
1613
1614out_unlock:
1615 hci_dev_unlock(hdev);
1616}
1617EXPORT_SYMBOL(l2cap_unregister_user);
1618
1619static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1620{
1621 struct l2cap_user *user;
1622
1623 while (!list_empty(&conn->users)) {
1624 user = list_first_entry(&conn->users, struct l2cap_user, list);
1625 list_del(&user->list);
1626 user->list.next = NULL;
1627 user->list.prev = NULL;
1628 user->remove(conn, user);
1629 }
1630}
1631
5d3de7df
VCG		 1632static void l2cap_conn_del(struct hci_conn *hcon, int err)
1633{
1634 struct l2cap_conn *conn = hcon->l2cap_data;
1635 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1636
1637 if (!conn)
1638 return;
1639
1640 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1641
1642 kfree_skb(conn->rx_skb);
1643
61a939c6 1644 skb_queue_purge(&conn->pending_rx);
7ab56c3a
JT		 1645
1646 /* We can not call flush_work(&conn->pending_rx_work) here since we
1647 * might block if we are running on a worker from the same workqueue
1648 * pending_rx_work is waiting on.
1649 */
1650 if (work_pending(&conn->pending_rx_work))
1651 cancel_work_sync(&conn->pending_rx_work);
61a939c6 1652
f3d82d0c
JH		 1653 if (work_pending(&conn->id_addr_update_work))
1654 cancel_work_sync(&conn->id_addr_update_work);
1655
2c8e1411
DH		 1656 l2cap_unregister_all_users(conn);
1657
e31fb860
JH		 1658 /* Force the connection to be immediately dropped */
1659 hcon->disc_timeout = 0;
1660
3df91ea2
AE		 1661 mutex_lock(&conn->chan_lock);
1662
5d3de7df
VCG		 1663 /* Kill channels */
1664 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1665 l2cap_chan_hold(chan);
6be36555
AE		 1666 l2cap_chan_lock(chan);
1667
5d3de7df 1668 l2cap_chan_del(chan, err);
6be36555
AE		 1669
1670 l2cap_chan_unlock(chan);
1671
80b98027 1672 chan->ops->close(chan);
61d6ef3e 1673 l2cap_chan_put(chan);
5d3de7df
VCG		 1674 }
1675
3df91ea2
AE		 1676 mutex_unlock(&conn->chan_lock);
1677
73d80deb
LAD		 1678 hci_chan_del(conn->hchan);
1679
5d3de7df 1680 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1681 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1682
5d3de7df 1683 hcon->l2cap_data = NULL;
9c903e37
DH		 1684 conn->hchan = NULL;
1685 l2cap_conn_put(conn);
5d3de7df
VCG		 1686}
1687
9c903e37
DH		 1688static void l2cap_conn_free(struct kref *ref)
1689{
1690 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1691
1692 hci_conn_put(conn->hcon);
1693 kfree(conn);
1694}
1695
51bb8457 1696struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
9c903e37
DH		 1697{
1698 kref_get(&conn->ref);
51bb8457 1699 return conn;
9c903e37
DH		 1700}
1701EXPORT_SYMBOL(l2cap_conn_get);
1702
1703void l2cap_conn_put(struct l2cap_conn *conn)
1704{
1705 kref_put(&conn->ref, l2cap_conn_free);
1706}
1707EXPORT_SYMBOL(l2cap_conn_put);
1708
1da177e4 1709/* ---- Socket interface ---- */
1da177e4 1710
c2287681 1711/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1712 * Returns closest match.
1713 */
c2287681
IY		 1714static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1715 bdaddr_t *src,
bf20fd4e
JH		 1716 bdaddr_t *dst,
1717 u8 link_type)
1da177e4 1718{
23691d75 1719 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1720
23691d75 1721 read_lock(&chan_list_lock);
e0f0cb56 1722
23691d75 1723 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1724 if (state && c->state != state)
1da177e4
LT		 1725 continue;
1726
bf20fd4e
JH		 1727 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1728 continue;
1729
1730 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1731 continue;
1732
23691d75 1733 if (c->psm == psm) {
c2287681
IY		 1734 int src_match, dst_match;
1735 int src_any, dst_any;
1736
1da177e4 1737 /* Exact match. */
7eafc59e
MH		 1738 src_match = !bacmp(&c->src, src);
1739 dst_match = !bacmp(&c->dst, dst);
c2287681 1740 if (src_match && dst_match) {
a24cce14 1741 l2cap_chan_hold(c);
a7567b20 1742 read_unlock(&chan_list_lock);
23691d75
GP		 1743 return c;
1744 }
1da177e4
LT		 1745
1746 /* Closest match */
7eafc59e
MH		 1747 src_any = !bacmp(&c->src, BDADDR_ANY);
1748 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1749 if ((src_match && dst_any) || (src_any && dst_match) ||
1750 (src_any && dst_any))
23691d75 1751 c1 = c;
1da177e4
LT		 1752 }
1753 }
1da177e4 1754
a24cce14
JH		 1755 if (c1)
1756 l2cap_chan_hold(c1);
1757
23691d75 1758 read_unlock(&chan_list_lock);
e0f0cb56 1759
23691d75 1760 return c1;
1da177e4
LT		 1761}
1762
721c4181 1763static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1764{
721c4181 1765 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1766 monitor_timer.work);
e90bac06 1767
525cd185 1768 BT_DBG("chan %p", chan);
0e98958d 1769
6be36555
AE		 1770 l2cap_chan_lock(chan);
1771
80909e04 1772 if (!chan->conn) {
6be36555 1773 l2cap_chan_unlock(chan);
8d7e1c7f 1774 l2cap_chan_put(chan);
e90bac06
GP		 1775 return;
1776 }
1777
401bb1f7 1778 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1779
6be36555 1780 l2cap_chan_unlock(chan);
8d7e1c7f 1781 l2cap_chan_put(chan);
e90bac06
GP		 1782}
1783
721c4181 1784static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1785{
721c4181 1786 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1787 retrans_timer.work);
e90bac06 1788
49208c9c 1789 BT_DBG("chan %p", chan);
0e98958d 1790
6be36555
AE		 1791 l2cap_chan_lock(chan);
1792
80909e04
MM		 1793 if (!chan->conn) {
1794 l2cap_chan_unlock(chan);
1795 l2cap_chan_put(chan);
1796 return;
1797 }
6be36555 1798
401bb1f7 1799 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1800 l2cap_chan_unlock(chan);
8d7e1c7f 1801 l2cap_chan_put(chan);
e90bac06
GP		 1802}
1803
d660366d
GP		 1804static void l2cap_streaming_send(struct l2cap_chan *chan,
1805 struct sk_buff_head *skbs)
6840ed07 1806{
ccbb84af 1807 struct sk_buff *skb;
3733937d 1808 struct l2cap_ctrl *control;
6840ed07 1809
3733937d
MM		 1810 BT_DBG("chan %p, skbs %p", chan, skbs);
1811
b99e13ad
MM		 1812 if (__chan_is_moving(chan))
1813 return;
1814
3733937d
MM		 1815 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1816
1817 while (!skb_queue_empty(&chan->tx_q)) {
1818
1819 skb = skb_dequeue(&chan->tx_q);
1820
1821 bt_cb(skb)->control.retries = 1;
1822 control = &bt_cb(skb)->control;
1823
1824 control->reqseq = 0;
1825 control->txseq = chan->next_tx_seq;
1826
1827 __pack_control(chan, control, skb);
6840ed07 1828
47d1ec61 1829 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1830 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1831 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1832 }
1833
4343478f 1834 l2cap_do_send(chan, skb);
6840ed07 1835
b4400672 1836 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1837
836be934 1838 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1839 chan->frames_sent++;
6840ed07 1840 }
6840ed07
GP		 1841}
1842
67c9e840 1843static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1844{
1845 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1846 struct l2cap_ctrl *control;
1847 int sent = 0;
1848
1849 BT_DBG("chan %p", chan);
1c2acffb 1850
89bc500e 1851 if (chan->state != BT_CONNECTED)
c13ffa62 1852 return -ENOTCONN;
e90bac06 1853
94122bbe
MM		 1854 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1855 return 0;
1856
b99e13ad
MM		 1857 if (__chan_is_moving(chan))
1858 return 0;
1859
18a48e76
MM		 1860 while (chan->tx_send_head &&
1861 chan->unacked_frames < chan->remote_tx_win &&
1862 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1863
18a48e76 1864 skb = chan->tx_send_head;
e90bac06 1865
18a48e76
MM		 1866 bt_cb(skb)->control.retries = 1;
1867 control = &bt_cb(skb)->control;
95ffa978 1868
e2ab4353 1869 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1870 control->final = 1;
e2ab4353 1871
18a48e76
MM		 1872 control->reqseq = chan->buffer_seq;
1873 chan->last_acked_seq = chan->buffer_seq;
1874 control->txseq = chan->next_tx_seq;
1c2acffb 1875
18a48e76 1876 __pack_control(chan, control, skb);
e90bac06 1877
47d1ec61 1878 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1879 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1880 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1881 }
1882
18a48e76
MM		 1883 /* Clone after data has been modified. Data is assumed to be
1884 read-only (for locking purposes) on cloned sk_buffs.
1885 */
1886 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1887
18a48e76
MM		 1888 if (!tx_skb)
1889 break;
1c2acffb 1890
18a48e76 1891 __set_retrans_timer(chan);
836be934
AE		 1892
1893 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1894 chan->unacked_frames++;
6a026610 1895 chan->frames_sent++;
18a48e76 1896 sent++;
1c2acffb 1897
58d35f87
GP		 1898 if (skb_queue_is_last(&chan->tx_q, skb))
1899 chan->tx_send_head = NULL;
1c2acffb 1900 else
58d35f87 1901 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1902
1903 l2cap_do_send(chan, tx_skb);
b4400672 1904 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1905 }
1906
b4400672
AE		 1907 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1908 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1909
1910 return sent;
9e917af1
GP		 1911}
1912
e1fbd4c1
MM		 1913static void l2cap_ertm_resend(struct l2cap_chan *chan)
1914{
1915 struct l2cap_ctrl control;
1916 struct sk_buff *skb;
1917 struct sk_buff *tx_skb;
1918 u16 seq;
1919
1920 BT_DBG("chan %p", chan);
1921
1922 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1923 return;
1924
b99e13ad
MM		 1925 if (__chan_is_moving(chan))
1926 return;
1927
e1fbd4c1
MM		 1928 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1929 seq = l2cap_seq_list_pop(&chan->retrans_list);
1930
1931 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1932 if (!skb) {
1933 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1934 seq);
e1fbd4c1
MM		 1935 continue;
1936 }
1937
1938 bt_cb(skb)->control.retries++;
1939 control = bt_cb(skb)->control;
1940
1941 if (chan->max_tx != 0 &&
1942 bt_cb(skb)->control.retries > chan->max_tx) {
1943 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1944 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1945 l2cap_seq_list_clear(&chan->retrans_list);
1946 break;
1947 }
1948
1949 control.reqseq = chan->buffer_seq;
1950 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1951 control.final = 1;
1952 else
1953 control.final = 0;
1954
1955 if (skb_cloned(skb)) {
1956 /* Cloned sk_buffs are read-only, so we need a
1957 * writeable copy
1958 */
8bcde1f2 1959 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1960 } else {
8bcde1f2 1961 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1962 }
1963
1964 if (!tx_skb) {
1965 l2cap_seq_list_clear(&chan->retrans_list);
1966 break;
1967 }
1968
1969 /* Update skb contents */
1970 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1971 put_unaligned_le32(__pack_extended_control(&control),
1972 tx_skb->data + L2CAP_HDR_SIZE);
1973 } else {
1974 put_unaligned_le16(__pack_enhanced_control(&control),
1975 tx_skb->data + L2CAP_HDR_SIZE);
1976 }
1977
13cac152 1978 /* Update FCS */
e1fbd4c1 1979 if (chan->fcs == L2CAP_FCS_CRC16) {
13cac152
LR		 1980 u16 fcs = crc16(0, (u8 *) tx_skb->data,
1981 tx_skb->len - L2CAP_FCS_SIZE);
1982 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
1983 L2CAP_FCS_SIZE);
e1fbd4c1
MM		 1984 }
1985
1986 l2cap_do_send(chan, tx_skb);
1987
1988 BT_DBG("Resent txseq %d", control.txseq);
1989
1990 chan->last_acked_seq = chan->buffer_seq;
1991 }
1992}
1993
f80842a8
MM		 1994static void l2cap_retransmit(struct l2cap_chan *chan,
1995 struct l2cap_ctrl *control)
1996{
1997 BT_DBG("chan %p, control %p", chan, control);
1998
1999 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2000 l2cap_ertm_resend(chan);
2001}
2002
d2a7ac5d
MM		 2003static void l2cap_retransmit_all(struct l2cap_chan *chan,
2004 struct l2cap_ctrl *control)
2005{
e1fbd4c1
MM		 2006 struct sk_buff *skb;
2007
2008 BT_DBG("chan %p, control %p", chan, control);
2009
2010 if (control->poll)
2011 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2012
2013 l2cap_seq_list_clear(&chan->retrans_list);
2014
2015 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2016 return;
2017
2018 if (chan->unacked_frames) {
2019 skb_queue_walk(&chan->tx_q, skb) {
2020 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2021 skb == chan->tx_send_head)
e1fbd4c1
MM		 2022 break;
2023 }
2024
2025 skb_queue_walk_from(&chan->tx_q, skb) {
2026 if (skb == chan->tx_send_head)
2027 break;
2028
2029 l2cap_seq_list_append(&chan->retrans_list,
2030 bt_cb(skb)->control.txseq);
2031 }
2032
2033 l2cap_ertm_resend(chan);
2034 }
d2a7ac5d
MM		 2035}
2036
0a0aba42 2037static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2038{
0a0aba42
MM		 2039 struct l2cap_ctrl control;
2040 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2041 chan->last_acked_seq);
2042 int threshold;
9e917af1 2043
0a0aba42
MM		 2044 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2045 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2046
0a0aba42
MM		 2047 memset(&control, 0, sizeof(control));
2048 control.sframe = 1;
dfc909be 2049
0a0aba42
MM		 2050 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2051 chan->rx_state == L2CAP_RX_STATE_RECV) {
2052 __clear_ack_timer(chan);
2053 control.super = L2CAP_SUPER_RNR;
2054 control.reqseq = chan->buffer_seq;
2055 l2cap_send_sframe(chan, &control);
2056 } else {
2057 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2058 l2cap_ertm_send(chan);
2059 /* If any i-frames were sent, they included an ack */
2060 if (chan->buffer_seq == chan->last_acked_seq)
2061 frames_to_ack = 0;
2062 }
dfc909be 2063
c20f8e35 2064 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2065 * Calculate without mul or div
2066 */
c20f8e35 2067 threshold = chan->ack_win;
0a0aba42
MM		 2068 threshold += threshold << 1;
2069 threshold >>= 2;
2070
b4400672 2071 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2072 threshold);
2073
2074 if (frames_to_ack >= threshold) {
2075 __clear_ack_timer(chan);
2076 control.super = L2CAP_SUPER_RR;
2077 control.reqseq = chan->buffer_seq;
2078 l2cap_send_sframe(chan, &control);
2079 frames_to_ack = 0;
2080 }
1c2acffb 2081
0a0aba42
MM		 2082 if (frames_to_ack)
2083 __set_ack_timer(chan);
2084 }
b17e73bb
SJ		 2085}
2086
04124681
GP		 2087static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2088 struct msghdr *msg, int len,
2089 int count, struct sk_buff *skb)
1c2acffb 2090{
0952a57a 2091 struct l2cap_conn *conn = chan->conn;
1c2acffb 2092 struct sk_buff **frag;
90338947 2093 int sent = 0;
1da177e4 2094
0498878b
JR		 2095 if (chan->ops->memcpy_fromiovec(chan, skb_put(skb, count),
2096 msg->msg_iov, count))
1c2acffb 2097 return -EFAULT;
1da177e4
LT		 2098
2099 sent += count;
2100 len -= count;
2101
2102 /* Continuation fragments (no L2CAP header) */
2103 frag = &skb_shinfo(skb)->frag_list;
2104 while (len) {
fbe00700
GP		 2105 struct sk_buff *tmp;
2106
1da177e4
LT		 2107 count = min_t(unsigned int, conn->mtu, len);
2108
d9fbd02b 2109 tmp = chan->ops->alloc_skb(chan, 0, count,
fbe00700
GP		 2110 msg->msg_flags & MSG_DONTWAIT);
2111 if (IS_ERR(tmp))
2112 return PTR_ERR(tmp);
2113
2114 *frag = tmp;
2f7719ce 2115
0498878b
JR		 2116 if (chan->ops->memcpy_fromiovec(chan, skb_put(*frag, count),
2117 msg->msg_iov, count))
1c2acffb 2118 return -EFAULT;
1da177e4
LT		 2119
2120 sent += count;
2121 len -= count;
2122
2d0ed3d5
GP		 2123 skb->len += (*frag)->len;
2124 skb->data_len += (*frag)->len;
2125
1da177e4
LT		 2126 frag = &(*frag)->next;
2127 }
1da177e4
LT		 2128
2129 return sent;
1c2acffb 2130}
1da177e4 2131
5e59b791 2132static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
8d46321c 2133 struct msghdr *msg, size_t len)
1c2acffb 2134{
8c1d787b 2135 struct l2cap_conn *conn = chan->conn;
1c2acffb 2136 struct sk_buff *skb;
03a51213 2137 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2138 struct l2cap_hdr *lh;
2139
8d46321c
MH		 2140 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2141 __le16_to_cpu(chan->psm), len);
1c2acffb
GP		 2142
2143 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2144
d9fbd02b 2145 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2146 msg->msg_flags & MSG_DONTWAIT);
2147 if (IS_ERR(skb))
2148 return skb;
1c2acffb
GP		 2149
2150 /* Create L2CAP header */
2151 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2152 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2153 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2154 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2155
0952a57a 2156 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2157 if (unlikely(err < 0)) {
2158 kfree_skb(skb);
2159 return ERR_PTR(err);
2160 }
2161 return skb;
2162}
2163
5e59b791 2164static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
8d46321c 2165 struct msghdr *msg, size_t len)
1c2acffb 2166{
8c1d787b 2167 struct l2cap_conn *conn = chan->conn;
1c2acffb 2168 struct sk_buff *skb;
f2ba7fae 2169 int err, count;
1c2acffb
GP		 2170 struct l2cap_hdr *lh;
2171
b4400672 2172 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2173
f2ba7fae 2174 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2175
d9fbd02b 2176 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
90338947
GP		 2177 msg->msg_flags & MSG_DONTWAIT);
2178 if (IS_ERR(skb))
2179 return skb;
1c2acffb
GP		 2180
2181 /* Create L2CAP header */
2182 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2183 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2184 lh->len = cpu_to_le16(len);
1c2acffb 2185
0952a57a 2186 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2187 if (unlikely(err < 0)) {
2188 kfree_skb(skb);
2189 return ERR_PTR(err);
2190 }
2191 return skb;
2192}
2193
ab0ff76d 2194static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2195 struct msghdr *msg, size_t len,
2196 u16 sdulen)
1c2acffb 2197{
8c1d787b 2198 struct l2cap_conn *conn = chan->conn;
1c2acffb 2199 struct sk_buff *skb;
e4ca6d98 2200 int err, count, hlen;
1c2acffb
GP		 2201 struct l2cap_hdr *lh;
2202
b4400672 2203 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2204
0ee0d208
GP		 2205 if (!conn)
2206 return ERR_PTR(-ENOTCONN);
2207
ba7aa64f 2208 hlen = __ertm_hdr_size(chan);
e4ca6d98 2209
c74e560c 2210 if (sdulen)
03a51213 2211 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2212
47d1ec61 2213 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2214 hlen += L2CAP_FCS_SIZE;
fcc203c3 2215
1c2acffb 2216 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2217
d9fbd02b 2218 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2219 msg->msg_flags & MSG_DONTWAIT);
2220 if (IS_ERR(skb))
2221 return skb;
1c2acffb
GP		 2222
2223 /* Create L2CAP header */
2224 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2225 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2226 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2227
18a48e76
MM		 2228 /* Control header is populated later */
2229 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2230 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2231 else
2232 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2233
c74e560c 2234 if (sdulen)
03a51213 2235 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2236
0952a57a 2237 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2238 if (unlikely(err < 0)) {
2239 kfree_skb(skb);
2240 return ERR_PTR(err);
2241 }
e90bac06 2242
18a48e76 2243 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2244 bt_cb(skb)->control.retries = 0;
1c2acffb 2245 return skb;
1da177e4
LT		 2246}
2247
94122bbe
MM		 2248static int l2cap_segment_sdu(struct l2cap_chan *chan,
2249 struct sk_buff_head *seg_queue,
2250 struct msghdr *msg, size_t len)
c74e560c 2251{
c74e560c 2252 struct sk_buff *skb;
94122bbe
MM		 2253 u16 sdu_len;
2254 size_t pdu_len;
94122bbe 2255 u8 sar;
c74e560c 2256
b4400672 2257 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2258
94122bbe
MM		 2259 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2260 * so fragmented skbs are not used. The HCI layer's handling
2261 * of fragmented skbs is not compatible with ERTM's queueing.
2262 */
c74e560c 2263
94122bbe
MM		 2264 /* PDU size is derived from the HCI MTU */
2265 pdu_len = chan->conn->mtu;
c74e560c 2266
a549574d
MM		 2267 /* Constrain PDU size for BR/EDR connections */
2268 if (!chan->hs_hcon)
2269 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2270
2271 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2272 if (chan->fcs)
2273 pdu_len -= L2CAP_FCS_SIZE;
2274
ba7aa64f 2275 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2276
2277 /* Remote device may have requested smaller PDUs */
2278 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2279
2280 if (len <= pdu_len) {
2281 sar = L2CAP_SAR_UNSEGMENTED;
2282 sdu_len = 0;
2283 pdu_len = len;
2284 } else {
2285 sar = L2CAP_SAR_START;
2286 sdu_len = len;
94122bbe
MM		 2287 }
2288
2289 while (len > 0) {
2290 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2291
c74e560c 2292 if (IS_ERR(skb)) {
94122bbe 2293 __skb_queue_purge(seg_queue);
c74e560c
GP		 2294 return PTR_ERR(skb);
2295 }
2296
94122bbe
MM		 2297 bt_cb(skb)->control.sar = sar;
2298 __skb_queue_tail(seg_queue, skb);
2299
2300 len -= pdu_len;
069cb270 2301 if (sdu_len)
94122bbe 2302 sdu_len = 0;
94122bbe
MM		 2303
2304 if (len <= pdu_len) {
2305 sar = L2CAP_SAR_END;
2306 pdu_len = len;
2307 } else {
2308 sar = L2CAP_SAR_CONTINUE;
2309 }
c74e560c 2310 }
c74e560c 2311
f0f62799 2312 return 0;
c74e560c
GP		 2313}
2314
177f8f2b
JH		 2315static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2316 struct msghdr *msg,
2317 size_t len, u16 sdulen)
2318{
2319 struct l2cap_conn *conn = chan->conn;
2320 struct sk_buff *skb;
2321 int err, count, hlen;
2322 struct l2cap_hdr *lh;
2323
2324 BT_DBG("chan %p len %zu", chan, len);
2325
2326 if (!conn)
2327 return ERR_PTR(-ENOTCONN);
2328
2329 hlen = L2CAP_HDR_SIZE;
2330
2331 if (sdulen)
2332 hlen += L2CAP_SDULEN_SIZE;
2333
2334 count = min_t(unsigned int, (conn->mtu - hlen), len);
2335
d9fbd02b 2336 skb = chan->ops->alloc_skb(chan, hlen, count,
177f8f2b
JH		 2337 msg->msg_flags & MSG_DONTWAIT);
2338 if (IS_ERR(skb))
2339 return skb;
2340
2341 /* Create L2CAP header */
2342 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2343 lh->cid = cpu_to_le16(chan->dcid);
2344 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2345
2346 if (sdulen)
2347 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2348
2349 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2350 if (unlikely(err < 0)) {
2351 kfree_skb(skb);
2352 return ERR_PTR(err);
2353 }
2354
2355 return skb;
2356}
2357
2358static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2359 struct sk_buff_head *seg_queue,
2360 struct msghdr *msg, size_t len)
2361{
2362 struct sk_buff *skb;
2363 size_t pdu_len;
2364 u16 sdu_len;
2365
2366 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2367
177f8f2b 2368 sdu_len = len;
72c6fb91 2369 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
177f8f2b
JH		 2370
2371 while (len > 0) {
2372 if (len <= pdu_len)
2373 pdu_len = len;
2374
2375 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2376 if (IS_ERR(skb)) {
2377 __skb_queue_purge(seg_queue);
2378 return PTR_ERR(skb);
2379 }
2380
2381 __skb_queue_tail(seg_queue, skb);
2382
2383 len -= pdu_len;
2384
2385 if (sdu_len) {
2386 sdu_len = 0;
2387 pdu_len += L2CAP_SDULEN_SIZE;
2388 }
2389 }
2390
2391 return 0;
2392}
2393
8d46321c 2394int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
9a91a04a 2395{
9a91a04a 2396 struct sk_buff *skb;
9a91a04a 2397 int err;
94122bbe 2398 struct sk_buff_head seg_queue;
9a91a04a 2399
31e8ce80
SWK		 2400 if (!chan->conn)
2401 return -ENOTCONN;
2402
9a91a04a 2403 /* Connectionless channel */
715ec005 2404 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
8d46321c 2405 skb = l2cap_create_connless_pdu(chan, msg, len);
9a91a04a
GP		 2406 if (IS_ERR(skb))
2407 return PTR_ERR(skb);
2408
ede81a2a
AK		 2409 /* Channel lock is released before requesting new skb and then
2410 * reacquired thus we need to recheck channel state.
2411 */
2412 if (chan->state != BT_CONNECTED) {
2413 kfree_skb(skb);
2414 return -ENOTCONN;
2415 }
2416
9a91a04a
GP		 2417 l2cap_do_send(chan, skb);
2418 return len;
2419 }
2420
2421 switch (chan->mode) {
38319713 2422 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2423 /* Check outgoing MTU */
2424 if (len > chan->omtu)
2425 return -EMSGSIZE;
2426
fad5fc89
JH		 2427 if (!chan->tx_credits)
2428 return -EAGAIN;
2429
177f8f2b
JH		 2430 __skb_queue_head_init(&seg_queue);
2431
2432 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2433
2434 if (chan->state != BT_CONNECTED) {
2435 __skb_queue_purge(&seg_queue);
2436 err = -ENOTCONN;
2437 }
2438
2439 if (err)
2440 return err;
2441
2442 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2443
2444 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2445 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2446 chan->tx_credits--;
2447 }
2448
2449 if (!chan->tx_credits)
2450 chan->ops->suspend(chan);
2451
2452 err = len;
2453
2454 break;
2455
fad5fc89 2456 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2457 /* Check outgoing MTU */
2458 if (len > chan->omtu)
2459 return -EMSGSIZE;
2460
2461 /* Create a basic PDU */
8d46321c 2462 skb = l2cap_create_basic_pdu(chan, msg, len);
9a91a04a
GP		 2463 if (IS_ERR(skb))
2464 return PTR_ERR(skb);
2465
ede81a2a
AK		 2466 /* Channel lock is released before requesting new skb and then
2467 * reacquired thus we need to recheck channel state.
2468 */
2469 if (chan->state != BT_CONNECTED) {
2470 kfree_skb(skb);
2471 return -ENOTCONN;
2472 }
2473
9a91a04a
GP		 2474 l2cap_do_send(chan, skb);
2475 err = len;
2476 break;
2477
2478 case L2CAP_MODE_ERTM:
2479 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2480 /* Check outgoing MTU */
2481 if (len > chan->omtu) {
2482 err = -EMSGSIZE;
2483 break;
2484 }
9a91a04a 2485
94122bbe 2486 __skb_queue_head_init(&seg_queue);
9a91a04a 2487
94122bbe
MM		 2488 /* Do segmentation before calling in to the state machine,
2489 * since it's possible to block while waiting for memory
2490 * allocation.
2491 */
2492 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2493
94122bbe
MM		 2494 /* The channel could have been closed while segmenting,
2495 * check that it is still connected.
2496 */
2497 if (chan->state != BT_CONNECTED) {
2498 __skb_queue_purge(&seg_queue);
2499 err = -ENOTCONN;
9a91a04a
GP		 2500 }
2501
94122bbe 2502 if (err)
9a91a04a 2503 break;
9a91a04a 2504
3733937d 2505 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2506 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2507 else
d660366d 2508 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2509
d660366d 2510 err = len;
9a91a04a 2511
94122bbe
MM		 2512 /* If the skbs were not queued for sending, they'll still be in
2513 * seg_queue and need to be purged.
2514 */
2515 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2516 break;
2517
2518 default:
2519 BT_DBG("bad state %1.1x", chan->mode);
2520 err = -EBADFD;
2521 }
2522
2523 return err;
2524}
6b8d4a6a 2525EXPORT_SYMBOL_GPL(l2cap_chan_send);
9a91a04a 2526
d2a7ac5d
MM		 2527static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2528{
bed68bde
MM		 2529 struct l2cap_ctrl control;
2530 u16 seq;
2531
b4400672 2532 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2533
2534 memset(&control, 0, sizeof(control));
2535 control.sframe = 1;
2536 control.super = L2CAP_SUPER_SREJ;
2537
2538 for (seq = chan->expected_tx_seq; seq != txseq;
2539 seq = __next_seq(chan, seq)) {
2540 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2541 control.reqseq = seq;
2542 l2cap_send_sframe(chan, &control);
2543 l2cap_seq_list_append(&chan->srej_list, seq);
2544 }
2545 }
2546
2547 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2548}
2549
2550static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2551{
bed68bde
MM		 2552 struct l2cap_ctrl control;
2553
2554 BT_DBG("chan %p", chan);
2555
2556 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2557 return;
2558
2559 memset(&control, 0, sizeof(control));
2560 control.sframe = 1;
2561 control.super = L2CAP_SUPER_SREJ;
2562 control.reqseq = chan->srej_list.tail;
2563 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2564}
2565
2566static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2567{
bed68bde
MM		 2568 struct l2cap_ctrl control;
2569 u16 initial_head;
2570 u16 seq;
2571
b4400672 2572 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2573
2574 memset(&control, 0, sizeof(control));
2575 control.sframe = 1;
2576 control.super = L2CAP_SUPER_SREJ;
2577
2578 /* Capture initial list head to allow only one pass through the list. */
2579 initial_head = chan->srej_list.head;
2580
2581 do {
2582 seq = l2cap_seq_list_pop(&chan->srej_list);
2583 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2584 break;
2585
2586 control.reqseq = seq;
2587 l2cap_send_sframe(chan, &control);
2588 l2cap_seq_list_append(&chan->srej_list, seq);
2589 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2590}
2591
608bcc6d
MM		 2592static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2593{
2594 struct sk_buff *acked_skb;
2595 u16 ackseq;
2596
b4400672 2597 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2598
2599 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2600 return;
2601
b4400672 2602 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2603 chan->expected_ack_seq, chan->unacked_frames);
2604
2605 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2606 ackseq = __next_seq(chan, ackseq)) {
2607
2608 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2609 if (acked_skb) {
2610 skb_unlink(acked_skb, &chan->tx_q);
2611 kfree_skb(acked_skb);
2612 chan->unacked_frames--;
2613 }
2614 }
2615
2616 chan->expected_ack_seq = reqseq;
2617
2618 if (chan->unacked_frames == 0)
2619 __clear_retrans_timer(chan);
2620
b4400672 2621 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2622}
2623
2624static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2625{
2626 BT_DBG("chan %p", chan);
2627
2628 chan->expected_tx_seq = chan->buffer_seq;
2629 l2cap_seq_list_clear(&chan->srej_list);
2630 skb_queue_purge(&chan->srej_q);
2631 chan->rx_state = L2CAP_RX_STATE_RECV;
2632}
2633
d660366d
GP		 2634static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2635 struct l2cap_ctrl *control,
2636 struct sk_buff_head *skbs, u8 event)
608bcc6d 2637{
608bcc6d
MM		 2638 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2639 event);
2640
2641 switch (event) {
2642 case L2CAP_EV_DATA_REQUEST:
2643 if (chan->tx_send_head == NULL)
2644 chan->tx_send_head = skb_peek(skbs);
2645
2646 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2647 l2cap_ertm_send(chan);
2648 break;
2649 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2650 BT_DBG("Enter LOCAL_BUSY");
2651 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2652
2653 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2654 /* The SREJ_SENT state must be aborted if we are to
2655 * enter the LOCAL_BUSY state.
2656 */
2657 l2cap_abort_rx_srej_sent(chan);
2658 }
2659
2660 l2cap_send_ack(chan);
2661
2662 break;
2663 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2664 BT_DBG("Exit LOCAL_BUSY");
2665 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2666
2667 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2668 struct l2cap_ctrl local_control;
2669
2670 memset(&local_control, 0, sizeof(local_control));
2671 local_control.sframe = 1;
2672 local_control.super = L2CAP_SUPER_RR;
2673 local_control.poll = 1;
2674 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2675 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2676
2677 chan->retry_count = 1;
2678 __set_monitor_timer(chan);
2679 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2680 }
2681 break;
2682 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2683 l2cap_process_reqseq(chan, control->reqseq);
2684 break;
2685 case L2CAP_EV_EXPLICIT_POLL:
2686 l2cap_send_rr_or_rnr(chan, 1);
2687 chan->retry_count = 1;
2688 __set_monitor_timer(chan);
2689 __clear_ack_timer(chan);
2690 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2691 break;
2692 case L2CAP_EV_RETRANS_TO:
2693 l2cap_send_rr_or_rnr(chan, 1);
2694 chan->retry_count = 1;
2695 __set_monitor_timer(chan);
2696 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2697 break;
2698 case L2CAP_EV_RECV_FBIT:
2699 /* Nothing to process */
2700 break;
2701 default:
2702 break;
2703 }
608bcc6d
MM		 2704}
2705
d660366d
GP		 2706static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2707 struct l2cap_ctrl *control,
2708 struct sk_buff_head *skbs, u8 event)
608bcc6d 2709{
608bcc6d
MM		 2710 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2711 event);
2712
2713 switch (event) {
2714 case L2CAP_EV_DATA_REQUEST:
2715 if (chan->tx_send_head == NULL)
2716 chan->tx_send_head = skb_peek(skbs);
2717 /* Queue data, but don't send. */
2718 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2719 break;
2720 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2721 BT_DBG("Enter LOCAL_BUSY");
2722 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2723
2724 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2725 /* The SREJ_SENT state must be aborted if we are to
2726 * enter the LOCAL_BUSY state.
2727 */
2728 l2cap_abort_rx_srej_sent(chan);
2729 }
2730
2731 l2cap_send_ack(chan);
2732
2733 break;
2734 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2735 BT_DBG("Exit LOCAL_BUSY");
2736 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2737
2738 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2739 struct l2cap_ctrl local_control;
2740 memset(&local_control, 0, sizeof(local_control));
2741 local_control.sframe = 1;
2742 local_control.super = L2CAP_SUPER_RR;
2743 local_control.poll = 1;
2744 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2745 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2746
2747 chan->retry_count = 1;
2748 __set_monitor_timer(chan);
2749 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2750 }
2751 break;
2752 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2753 l2cap_process_reqseq(chan, control->reqseq);
2754
2755 /* Fall through */
2756
2757 case L2CAP_EV_RECV_FBIT:
2758 if (control && control->final) {
2759 __clear_monitor_timer(chan);
2760 if (chan->unacked_frames > 0)
2761 __set_retrans_timer(chan);
2762 chan->retry_count = 0;
2763 chan->tx_state = L2CAP_TX_STATE_XMIT;
2764 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2765 }
2766 break;
2767 case L2CAP_EV_EXPLICIT_POLL:
2768 /* Ignore */
2769 break;
2770 case L2CAP_EV_MONITOR_TO:
2771 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2772 l2cap_send_rr_or_rnr(chan, 1);
2773 __set_monitor_timer(chan);
2774 chan->retry_count++;
2775 } else {
5e4e3972 2776 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2777 }
2778 break;
2779 default:
2780 break;
2781 }
608bcc6d
MM		 2782}
2783
d660366d
GP		 2784static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2785 struct sk_buff_head *skbs, u8 event)
608bcc6d 2786{
608bcc6d
MM		 2787 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2788 chan, control, skbs, event, chan->tx_state);
2789
2790 switch (chan->tx_state) {
2791 case L2CAP_TX_STATE_XMIT:
d660366d 2792 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2793 break;
2794 case L2CAP_TX_STATE_WAIT_F:
d660366d 2795 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2796 break;
2797 default:
2798 /* Ignore event */
2799 break;
2800 }
608bcc6d
MM		 2801}
2802
4b51dae9
MM		 2803static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2804 struct l2cap_ctrl *control)
2805{
2806 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2807 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2808}
2809
f80842a8
MM		 2810static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2811 struct l2cap_ctrl *control)
2812{
2813 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2814 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2815}
2816
1da177e4
LT		 2817/* Copy frame to all raw sockets on that connection */
2818static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2819{
1da177e4 2820 struct sk_buff *nskb;
48454079 2821 struct l2cap_chan *chan;
1da177e4
LT		 2822
2823 BT_DBG("conn %p", conn);
2824
3df91ea2 2825 mutex_lock(&conn->chan_lock);
3d57dc68 2826
3df91ea2 2827 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2828 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2829 continue;
2830
7f5396a7
GP		 2831 /* Don't send frame to the channel it came from */
2832 if (bt_cb(skb)->chan == chan)
1da177e4 2833 continue;
7f5396a7 2834
8bcde1f2 2835 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2836 if (!nskb)
1da177e4 2837 continue;
80b98027 2838 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2839 kfree_skb(nskb);
2840 }
3d57dc68 2841
3df91ea2 2842 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2843}
2844
2845/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2846static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2847 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2848{
2849 struct sk_buff *skb, **frag;
2850 struct l2cap_cmd_hdr *cmd;
2851 struct l2cap_hdr *lh;
2852 int len, count;
2853
b4400672
AE		 2854 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2855 conn, code, ident, dlen);
1da177e4 2856
300b962e
AL		 2857 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2858 return NULL;
2859
1da177e4
LT		 2860 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2861 count = min_t(unsigned int, conn->mtu, len);
2862
8bcde1f2 2863 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2864 if (!skb)
2865 return NULL;
2866
2867 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2868 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2869
2870 if (conn->hcon->type == LE_LINK)
dcf4adbf 2871 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2872 else
dcf4adbf 2873 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2874
2875 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2876 cmd->code = code;
2877 cmd->ident = ident;
aca3192c 2878 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2879
2880 if (dlen) {
2881 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2882 memcpy(skb_put(skb, count), data, count);
2883 data += count;
2884 }
2885
2886 len -= skb->len;
2887
2888 /* Continuation fragments (no L2CAP header) */
2889 frag = &skb_shinfo(skb)->frag_list;
2890 while (len) {
2891 count = min_t(unsigned int, conn->mtu, len);
2892
8bcde1f2 2893 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2894 if (!*frag)
2895 goto fail;
2896
2897 memcpy(skb_put(*frag, count), data, count);
2898
2899 len -= count;
2900 data += count;
2901
2902 frag = &(*frag)->next;
2903 }
2904
2905 return skb;
2906
2907fail:
2908 kfree_skb(skb);
2909 return NULL;
2910}
2911
2d792818
GP		 2912static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2913 unsigned long *val)
1da177e4
LT		 2914{
2915 struct l2cap_conf_opt *opt = *ptr;
2916 int len;
2917
2918 len = L2CAP_CONF_OPT_SIZE + opt->len;
2919 *ptr += len;
2920
2921 *type = opt->type;
2922 *olen = opt->len;
2923
2924 switch (opt->len) {
2925 case 1:
2926 *val = *((u8 *) opt->val);
2927 break;
2928
2929 case 2:
bfaaeb3e 2930 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2931 break;
2932
2933 case 4:
bfaaeb3e 2934 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2935 break;
2936
2937 default:
2938 *val = (unsigned long) opt->val;
2939 break;
2940 }
2941
b4400672 2942 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2943 return len;
2944}
2945
1da177e4
LT		 2946static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2947{
2948 struct l2cap_conf_opt *opt = *ptr;
2949
b4400672 2950 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2951
2952 opt->type = type;
2953 opt->len = len;
2954
2955 switch (len) {
2956 case 1:
2957 *((u8 *) opt->val) = val;
2958 break;
2959
2960 case 2:
4f8b691c 2961 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2962 break;
2963
2964 case 4:
4f8b691c 2965 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2966 break;
2967
2968 default:
2969 memcpy(opt->val, (void *) val, len);
2970 break;
2971 }
2972
2973 *ptr += L2CAP_CONF_OPT_SIZE + len;
2974}
2975
f89cef09
AE		 2976static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2977{
2978 struct l2cap_conf_efs efs;
2979
1ec918ce 2980 switch (chan->mode) {
f89cef09
AE		 2981 case L2CAP_MODE_ERTM:
2982 efs.id = chan->local_id;
2983 efs.stype = chan->local_stype;
2984 efs.msdu = cpu_to_le16(chan->local_msdu);
2985 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
dcf4adbf
JP		 2986 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2987 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 2988 break;
2989
2990 case L2CAP_MODE_STREAMING:
2991 efs.id = 1;
2992 efs.stype = L2CAP_SERV_BESTEFFORT;
2993 efs.msdu = cpu_to_le16(chan->local_msdu);
2994 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2995 efs.acc_lat = 0;
2996 efs.flush_to = 0;
2997 break;
2998
2999 default:
3000 return;
3001 }
3002
3003 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3004 (unsigned long) &efs);
f89cef09
AE		 3005}
3006
721c4181 3007static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3008{
721c4181 3009 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3010 ack_timer.work);
3011 u16 frames_to_ack;
c1b4f43b 3012
2fb9b3d4
GP		 3013 BT_DBG("chan %p", chan);
3014
6be36555
AE		 3015 l2cap_chan_lock(chan);
3016
0362520b
MM		 3017 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3018 chan->last_acked_seq);
6be36555 3019
0362520b
MM		 3020 if (frames_to_ack)
3021 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3022
0362520b 3023 l2cap_chan_unlock(chan);
09bfb2ee 3024 l2cap_chan_put(chan);
c1b4f43b
GP		 3025}
3026
466f8004 3027int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3028{
3c588192
MM		 3029 int err;
3030
105bdf9e
MM		 3031 chan->next_tx_seq = 0;
3032 chan->expected_tx_seq = 0;
42e5c802 3033 chan->expected_ack_seq = 0;
6a026610 3034 chan->unacked_frames = 0;
42e5c802 3035 chan->buffer_seq = 0;
6a026610 3036 chan->frames_sent = 0;
105bdf9e
MM		 3037 chan->last_acked_seq = 0;
3038 chan->sdu = NULL;
3039 chan->sdu_last_frag = NULL;
3040 chan->sdu_len = 0;
3041
d34c34fb
MM		 3042 skb_queue_head_init(&chan->tx_q);
3043
6ed971ca
MH		 3044 chan->local_amp_id = AMP_ID_BREDR;
3045 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3046 chan->move_state = L2CAP_MOVE_STABLE;
3047 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3048
105bdf9e
MM		 3049 if (chan->mode != L2CAP_MODE_ERTM)
3050 return 0;
3051
3052 chan->rx_state = L2CAP_RX_STATE_RECV;
3053 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3054
721c4181
GP		 3055 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3056 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3057 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3058
f1c6775b 3059 skb_queue_head_init(&chan->srej_q);
1890d36b 3060
3c588192
MM		 3061 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3062 if (err < 0)
3063 return err;
3064
9dc9affc
MM		 3065 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3066 if (err < 0)
3067 l2cap_seq_list_free(&chan->srej_list);
3068
3069 return err;
0565c1c2
GP		 3070}
3071
f2fcfcd6
GP		 3072static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3073{
3074 switch (mode) {
3075 case L2CAP_MODE_STREAMING:
3076 case L2CAP_MODE_ERTM:
3077 if (l2cap_mode_supported(mode, remote_feat_mask))
3078 return mode;
3079 /* fall through */
3080 default:
3081 return L2CAP_MODE_BASIC;
3082 }
3083}
3084
848566b3 3085static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3086{
848566b3 3087 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
6327eb98
AE		 3088}
3089
848566b3 3090static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3091{
848566b3 3092 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
f89cef09
AE		 3093}
3094
36c86c85
MM		 3095static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3096 struct l2cap_conf_rfc *rfc)
3097{
6ed971ca 3098 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3099 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3100
3101 /* Class 1 devices have must have ERTM timeouts
3102 * exceeding the Link Supervision Timeout. The
3103 * default Link Supervision Timeout for AMP
3104 * controllers is 10 seconds.
3105 *
3106 * Class 1 devices use 0xffffffff for their
3107 * best-effort flush timeout, so the clamping logic
3108 * will result in a timeout that meets the above
3109 * requirement. ERTM timeouts are 16-bit values, so
3110 * the maximum timeout is 65.535 seconds.
3111 */
3112
3113 /* Convert timeout to milliseconds and round */
3114 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3115
3116 /* This is the recommended formula for class 2 devices
3117 * that start ERTM timers when packets are sent to the
3118 * controller.
3119 */
3120 ertm_to = 3 * ertm_to + 500;
3121
3122 if (ertm_to > 0xffff)
3123 ertm_to = 0xffff;
3124
3125 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3126 rfc->monitor_timeout = rfc->retrans_timeout;
3127 } else {
dcf4adbf
JP		 3128 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3129 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
36c86c85
MM		 3130 }
3131}
3132
6327eb98
AE		 3133static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3134{
3135 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3136 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3137 /* use extended control field */
3138 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3139 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3140 } else {
6327eb98 3141 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3142 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3143 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3144 }
c20f8e35 3145 chan->ack_win = chan->tx_win;
6327eb98
AE		 3146}
3147
710f9b0a 3148static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3149{
1da177e4 3150 struct l2cap_conf_req *req = data;
0c1bc5c6 3151 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3152 void *ptr = req->data;
c8f79162 3153 u16 size;
1da177e4 3154
49208c9c 3155 BT_DBG("chan %p", chan);
1da177e4 3156
73ffa904 3157 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3158 goto done;
3159
0c1bc5c6 3160 switch (chan->mode) {
f2fcfcd6
GP		 3161 case L2CAP_MODE_STREAMING:
3162 case L2CAP_MODE_ERTM:
c1360a1c 3163 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3164 break;
85eb53c6 3165
848566b3 3166 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3167 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3168
2ba13ed6 3169 /* fall through */
f2fcfcd6 3170 default:
8c1d787b 3171 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3172 break;
3173 }
3174
3175done:
0c1bc5c6
GP		 3176 if (chan->imtu != L2CAP_DEFAULT_MTU)
3177 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3178
0c1bc5c6 3179 switch (chan->mode) {
65c7c491 3180 case L2CAP_MODE_BASIC:
6fea7ad1
MH		 3181 if (disable_ertm)
3182 break;
3183
8c1d787b 3184 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3185 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3186 break;
3187
62547752
GP		 3188 rfc.mode = L2CAP_MODE_BASIC;
3189 rfc.txwin_size = 0;
3190 rfc.max_transmit = 0;
3191 rfc.retrans_timeout = 0;
3192 rfc.monitor_timeout = 0;
3193 rfc.max_pdu_size = 0;
3194
63406504 3195 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3196 (unsigned long) &rfc);
65c7c491
MH		 3197 break;
3198
3199 case L2CAP_MODE_ERTM:
3200 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3201 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3202
3203 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3204
3205 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3206 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3207 L2CAP_FCS_SIZE);
c8f79162 3208 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3209
6327eb98
AE		 3210 l2cap_txwin_setup(chan);
3211
3212 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3213 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3214
63406504 3215 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3216 (unsigned long) &rfc);
63406504 3217
f89cef09
AE		 3218 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3219 l2cap_add_opt_efs(&ptr, chan);
3220
6327eb98
AE		 3221 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3222 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3223 chan->tx_win);
60918918
AE		 3224
3225 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3226 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3227 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3228 chan->fcs = L2CAP_FCS_NONE;
3229 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3230 chan->fcs);
3231 }
f2fcfcd6
GP		 3232 break;
3233
3234 case L2CAP_MODE_STREAMING:
273759e2 3235 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3236 rfc.mode = L2CAP_MODE_STREAMING;
3237 rfc.txwin_size = 0;
3238 rfc.max_transmit = 0;
3239 rfc.retrans_timeout = 0;
3240 rfc.monitor_timeout = 0;
c8f79162
AE		 3241
3242 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3243 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3244 L2CAP_FCS_SIZE);
c8f79162 3245 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3246
63406504 3247 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3248 (unsigned long) &rfc);
63406504 3249
f89cef09
AE		 3250 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3251 l2cap_add_opt_efs(&ptr, chan);
3252
60918918
AE		 3253 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3254 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3255 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3256 chan->fcs = L2CAP_FCS_NONE;
3257 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3258 chan->fcs);
3259 }
65c7c491
MH		 3260 break;
3261 }
1da177e4 3262
fe4128e0 3263 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3264 req->flags = cpu_to_le16(0);
1da177e4
LT		 3265
3266 return ptr - data;
3267}
3268
73ffa904 3269static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3270{
5dee9e7c
MH		 3271 struct l2cap_conf_rsp *rsp = data;
3272 void *ptr = rsp->data;
73ffa904
GP		 3273 void *req = chan->conf_req;
3274 int len = chan->conf_len;
5dee9e7c
MH		 3275 int type, hint, olen;
3276 unsigned long val;
6464f35f 3277 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3278 struct l2cap_conf_efs efs;
3279 u8 remote_efs = 0;
861d6882 3280 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3281 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3282 u16 size;
1da177e4 3283
73ffa904 3284 BT_DBG("chan %p", chan);
820ae1b8 3285
5dee9e7c
MH		 3286 while (len >= L2CAP_CONF_OPT_SIZE) {
3287 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3288
589d2746 3289 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3290 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3291
3292 switch (type) {
3293 case L2CAP_CONF_MTU:
861d6882 3294 mtu = val;
5dee9e7c
MH		 3295 break;
3296
3297 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3298 chan->flush_to = val;
5dee9e7c
MH		 3299 break;
3300
3301 case L2CAP_CONF_QOS:
3302 break;
3303
6464f35f
MH		 3304 case L2CAP_CONF_RFC:
3305 if (olen == sizeof(rfc))
3306 memcpy(&rfc, (void *) val, olen);
3307 break;
3308
fcc203c3
GP		 3309 case L2CAP_CONF_FCS:
3310 if (val == L2CAP_FCS_NONE)
f2592d3e 3311 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3312 break;
fcc203c3 3313
42dceae2
AE		 3314 case L2CAP_CONF_EFS:
3315 remote_efs = 1;
3316 if (olen == sizeof(efs))
3317 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3318 break;
3319
6327eb98 3320 case L2CAP_CONF_EWS:
848566b3 3321 if (!chan->conn->hs_enabled)
6327eb98 3322 return -ECONNREFUSED;
fcc203c3 3323
6327eb98
AE		 3324 set_bit(FLAG_EXT_CTRL, &chan->flags);
3325 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3326 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3327 chan->remote_tx_win = val;
fcc203c3
GP		 3328 break;
3329
5dee9e7c
MH		 3330 default:
3331 if (hint)
3332 break;
3333
3334 result = L2CAP_CONF_UNKNOWN;
3335 *((u8 *) ptr++) = type;
3336 break;
3337 }
3338 }
3339
73ffa904 3340 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3341 goto done;
3342
0c1bc5c6 3343 switch (chan->mode) {
f2fcfcd6
GP		 3344 case L2CAP_MODE_STREAMING:
3345 case L2CAP_MODE_ERTM:
c1360a1c 3346 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3347 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3348 chan->conn->feat_mask);
85eb53c6
GP		 3349 break;
3350 }
3351
42dceae2 3352 if (remote_efs) {
848566b3 3353 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3354 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3355 else
3356 return -ECONNREFUSED;
3357 }
3358
0c1bc5c6 3359 if (chan->mode != rfc.mode)
f2fcfcd6 3360 return -ECONNREFUSED;
742e519b 3361
f2fcfcd6 3362 break;
f2fcfcd6
GP		 3363 }
3364
3365done:
0c1bc5c6 3366 if (chan->mode != rfc.mode) {
f2fcfcd6 3367 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3368 rfc.mode = chan->mode;
f2fcfcd6 3369
73ffa904 3370 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3371 return -ECONNREFUSED;
3372
2d792818
GP		 3373 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3374 (unsigned long) &rfc);
f2fcfcd6
GP		 3375 }
3376
5dee9e7c
MH		 3377 if (result == L2CAP_CONF_SUCCESS) {
3378 /* Configure output options and let the other side know
3379 * which ones we don't like. */
3380
f2fcfcd6
GP		 3381 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3382 result = L2CAP_CONF_UNACCEPT;
3383 else {
0c1bc5c6 3384 chan->omtu = mtu;
c1360a1c 3385 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3386 }
0c1bc5c6 3387 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3388
42dceae2
AE		 3389 if (remote_efs) {
3390 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3391 efs.stype != L2CAP_SERV_NOTRAFIC &&
3392 efs.stype != chan->local_stype) {
42dceae2
AE		 3393
3394 result = L2CAP_CONF_UNACCEPT;
3395
3396 if (chan->num_conf_req >= 1)
3397 return -ECONNREFUSED;
3398
3399 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3400 sizeof(efs),
3401 (unsigned long) &efs);
0e8b207e 3402 } else {
3e6b3b95 3403 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3404 result = L2CAP_CONF_PENDING;
3405 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3406 }
3407 }
3408
f2fcfcd6
GP		 3409 switch (rfc.mode) {
3410 case L2CAP_MODE_BASIC:
47d1ec61 3411 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3412 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3413 break;
3414
3415 case L2CAP_MODE_ERTM:
6327eb98
AE		 3416 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3417 chan->remote_tx_win = rfc.txwin_size;
3418 else
3419 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3420
2c03a7a4 3421 chan->remote_max_tx = rfc.max_transmit;
1c762159 3422
c8f79162 3423 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3424 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3425 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3426 rfc.max_pdu_size = cpu_to_le16(size);
3427 chan->remote_mps = size;
f2fcfcd6 3428
36c86c85 3429 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3430
c1360a1c 3431 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3432
3433 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3434 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3435
42dceae2
AE		 3436 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3437 chan->remote_id = efs.id;
3438 chan->remote_stype = efs.stype;
3439 chan->remote_msdu = le16_to_cpu(efs.msdu);
3440 chan->remote_flush_to =
2d792818 3441 le32_to_cpu(efs.flush_to);
42dceae2 3442 chan->remote_acc_lat =
2d792818 3443 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3444 chan->remote_sdu_itime =
3445 le32_to_cpu(efs.sdu_itime);
3446 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3447 sizeof(efs),
3448 (unsigned long) &efs);
42dceae2 3449 }
f2fcfcd6
GP		 3450 break;
3451
3452 case L2CAP_MODE_STREAMING:
c8f79162 3453 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3454 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3455 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3456 rfc.max_pdu_size = cpu_to_le16(size);
3457 chan->remote_mps = size;
f2fcfcd6 3458
c1360a1c 3459 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3460
2d792818
GP		 3461 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3462 (unsigned long) &rfc);
68ae6639 3463
f2fcfcd6
GP		 3464 break;
3465
3466 default:
5dee9e7c 3467 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3468
6464f35f 3469 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3470 rfc.mode = chan->mode;
f2fcfcd6 3471 }
6464f35f 3472
f2fcfcd6 3473 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3474 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3475 }
fe4128e0 3476 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3477 rsp->result = cpu_to_le16(result);
dcf4adbf 3478 rsp->flags = cpu_to_le16(0);
5dee9e7c
MH		 3479
3480 return ptr - data;
1da177e4
LT		 3481}
3482
2d792818
GP		 3483static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3484 void *data, u16 *result)
f2fcfcd6 3485{
f2fcfcd6
GP		 3486 struct l2cap_conf_req *req = data;
3487 void *ptr = req->data;
3488 int type, olen;
3489 unsigned long val;
36e999a8 3490 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3491 struct l2cap_conf_efs efs;
f2fcfcd6 3492
fe4128e0 3493 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3494
3495 while (len >= L2CAP_CONF_OPT_SIZE) {
3496 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3497
3498 switch (type) {
3499 case L2CAP_CONF_MTU:
3500 if (val < L2CAP_DEFAULT_MIN_MTU) {
3501 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3502 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3503 } else
0c1bc5c6
GP		 3504 chan->imtu = val;
3505 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3506 break;
3507
3508 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3509 chan->flush_to = val;
f2fcfcd6 3510 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3511 2, chan->flush_to);
f2fcfcd6
GP		 3512 break;
3513
3514 case L2CAP_CONF_RFC:
3515 if (olen == sizeof(rfc))
3516 memcpy(&rfc, (void *)val, olen);
3517
c1360a1c 3518 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3519 rfc.mode != chan->mode)
f2fcfcd6
GP		 3520 return -ECONNREFUSED;
3521
47d1ec61 3522 chan->fcs = 0;
f2fcfcd6
GP		 3523
3524 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3525 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3526 break;
6327eb98
AE		 3527
3528 case L2CAP_CONF_EWS:
c20f8e35 3529 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3530 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3531 chan->tx_win);
6327eb98 3532 break;
66af7aaf
AE		 3533
3534 case L2CAP_CONF_EFS:
3535 if (olen == sizeof(efs))
3536 memcpy(&efs, (void *)val, olen);
3537
3538 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3539 efs.stype != L2CAP_SERV_NOTRAFIC &&
3540 efs.stype != chan->local_stype)
66af7aaf
AE		 3541 return -ECONNREFUSED;
3542
2d792818
GP		 3543 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3544 (unsigned long) &efs);
66af7aaf 3545 break;
cbabee78
AE		 3546
3547 case L2CAP_CONF_FCS:
3548 if (*result == L2CAP_CONF_PENDING)
3549 if (val == L2CAP_FCS_NONE)
f2592d3e 3550 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3551 &chan->conf_state);
3552 break;
f2fcfcd6
GP		 3553 }
3554 }
3555
0c1bc5c6 3556 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3557 return -ECONNREFUSED;
3558
0c1bc5c6 3559 chan->mode = rfc.mode;
6c2ea7a8 3560
0e8b207e 3561 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3562 switch (rfc.mode) {
3563 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3564 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3565 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3566 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3567 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3568 chan->ack_win = min_t(u16, chan->ack_win,
3569 rfc.txwin_size);
66af7aaf
AE		 3570
3571 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3572 chan->local_msdu = le16_to_cpu(efs.msdu);
3573 chan->local_sdu_itime =
2d792818 3574 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3575 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3576 chan->local_flush_to =
2d792818 3577 le32_to_cpu(efs.flush_to);
66af7aaf 3578 }
f2fcfcd6 3579 break;
66af7aaf 3580
f2fcfcd6 3581 case L2CAP_MODE_STREAMING:
47d1ec61 3582 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3583 }
3584 }
3585
fe4128e0 3586 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3587 req->flags = cpu_to_le16(0);
f2fcfcd6
GP		 3588
3589 return ptr - data;
3590}
3591
2d792818
GP		 3592static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3593 u16 result, u16 flags)
1da177e4
LT		 3594{
3595 struct l2cap_conf_rsp *rsp = data;
3596 void *ptr = rsp->data;
1da177e4 3597
fe4128e0 3598 BT_DBG("chan %p", chan);
1da177e4 3599
fe4128e0 3600 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3601 rsp->result = cpu_to_le16(result);
aca3192c 3602 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3603
3604 return ptr - data;
3605}
3606
27e2d4c8
JH		 3607void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3608{
3609 struct l2cap_le_conn_rsp rsp;
3610 struct l2cap_conn *conn = chan->conn;
3611
3612 BT_DBG("chan %p", chan);
3613
3614 rsp.dcid = cpu_to_le16(chan->scid);
3615 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3616 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3617 rsp.credits = cpu_to_le16(chan->rx_credits);
dcf4adbf 3618 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
27e2d4c8
JH		 3619
3620 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3621 &rsp);
3622}
3623
8c1d787b 3624void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3625{
3626 struct l2cap_conn_rsp rsp;
8c1d787b 3627 struct l2cap_conn *conn = chan->conn;
710f9b0a 3628 u8 buf[128];
439f34ac 3629 u8 rsp_code;
710f9b0a 3630
fe4128e0
GP		 3631 rsp.scid = cpu_to_le16(chan->dcid);
3632 rsp.dcid = cpu_to_le16(chan->scid);
dcf4adbf
JP		 3633 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3634 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3635
3636 if (chan->hs_hcon)
3637 rsp_code = L2CAP_CREATE_CHAN_RSP;
3638 else
3639 rsp_code = L2CAP_CONN_RSP;
3640
3641 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3642
3643 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3644
c1360a1c 3645 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3646 return;
3647
710f9b0a 3648 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3649 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3650 chan->num_conf_req++;
3651}
3652
47d1ec61 3653static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3654{
7b1c0049
GP		 3655 int type, olen;
3656 unsigned long val;
c20f8e35
MM		 3657 /* Use sane default values in case a misbehaving remote device
3658 * did not send an RFC or extended window size option.
3659 */
3660 u16 txwin_ext = chan->ack_win;
3661 struct l2cap_conf_rfc rfc = {
3662 .mode = chan->mode,
dcf4adbf
JP		 3663 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3664 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
c20f8e35
MM		 3665 .max_pdu_size = cpu_to_le16(chan->imtu),
3666 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3667 };
7b1c0049 3668
47d1ec61 3669 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3670
0c1bc5c6 3671 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3672 return;
3673
3674 while (len >= L2CAP_CONF_OPT_SIZE) {
3675 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3676
c20f8e35
MM		 3677 switch (type) {
3678 case L2CAP_CONF_RFC:
3679 if (olen == sizeof(rfc))
3680 memcpy(&rfc, (void *)val, olen);
8f321f85 3681 break;
c20f8e35
MM		 3682 case L2CAP_CONF_EWS:
3683 txwin_ext = val;
3684 break;
3685 }
7b1c0049
GP		 3686 }
3687
7b1c0049
GP		 3688 switch (rfc.mode) {
3689 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3690 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3691 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3692 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3693 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3694 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3695 else
3696 chan->ack_win = min_t(u16, chan->ack_win,
3697 rfc.txwin_size);
7b1c0049
GP		 3698 break;
3699 case L2CAP_MODE_STREAMING:
47d1ec61 3700 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3701 }
3702}
3703
2d792818 3704static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3705 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3706 u8 *data)
4e8402a3 3707{
e2fd318e 3708 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3709
cb3b3152
JH		 3710 if (cmd_len < sizeof(*rej))
3711 return -EPROTO;
3712
e2fd318e 3713 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3714 return 0;
3715
3716 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3717 cmd->ident == conn->info_ident) {
17cd3f37 3718 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3719
3720 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3721 conn->info_ident = 0;
984947dc 3722
4e8402a3
MH		 3723 l2cap_conn_start(conn);
3724 }
3725
3726 return 0;
3727}
3728
1700915f
MM		 3729static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3730 struct l2cap_cmd_hdr *cmd,
3731 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3732{
1da177e4
LT		 3733 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3734 struct l2cap_conn_rsp rsp;
23691d75 3735 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3736 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3737
3738 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3739 __le16 psm = req->psm;
1da177e4 3740
097db76c 3741 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3742
3743 /* Check if we have socket listening on psm */
6f59b904 3744 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3745 &conn->hcon->dst, ACL_LINK);
23691d75 3746 if (!pchan) {
1da177e4
LT		 3747 result = L2CAP_CR_BAD_PSM;
3748 goto sendresp;
3749 }
3750
3df91ea2 3751 mutex_lock(&conn->chan_lock);
8ffb9290 3752 l2cap_chan_lock(pchan);
e0f0cb56 3753
e7c29cb1 3754 /* Check if the ACL is secure enough (if not SDP) */
dcf4adbf 3755 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3756 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3757 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3758 result = L2CAP_CR_SEC_BLOCK;
3759 goto response;
3760 }
3761
1da177e4
LT		 3762 result = L2CAP_CR_NO_MEM;
3763
2dfa1003
GP		 3764 /* Check if we already have channel with that dcid */
3765 if (__l2cap_get_chan_by_dcid(conn, scid))
3766 goto response;
3767
80b98027 3768 chan = pchan->ops->new_connection(pchan);
80808e43 3769 if (!chan)
1da177e4
LT		 3770 goto response;
3771
330b6c15
SS		 3772 /* For certain devices (ex: HID mouse), support for authentication,
3773 * pairing and bonding is optional. For such devices, inorder to avoid
3774 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3775 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3776 */
3777 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3778
7eafc59e
MH		 3779 bacpy(&chan->src, &conn->hcon->src);
3780 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 3781 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3782 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
fe4128e0
GP		 3783 chan->psm = psm;
3784 chan->dcid = scid;
1700915f 3785 chan->local_amp_id = amp_id;
1da177e4 3786
6be36555 3787 __l2cap_chan_add(conn, chan);
48454079 3788
fe4128e0 3789 dcid = chan->scid;
1da177e4 3790
8d836d71 3791 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3792
fc7f8a7e 3793 chan->ident = cmd->ident;
1da177e4 3794
984947dc 3795 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
e7cafc45 3796 if (l2cap_chan_check_security(chan, false)) {
bdc25783 3797 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3798 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3799 result = L2CAP_CR_PEND;
3800 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3801 chan->ops->defer(chan);
f66dc81f 3802 } else {
1700915f
MM		 3803 /* Force pending result for AMP controllers.
3804 * The connection will succeed after the
3805 * physical link is up.
3806 */
6ed971ca 3807 if (amp_id == AMP_ID_BREDR) {
f93fa273 3808 l2cap_state_change(chan, BT_CONFIG);
1700915f 3809 result = L2CAP_CR_SUCCESS;
6ed971ca 3810 } else {
f93fa273 3811 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3812 result = L2CAP_CR_PEND;
1700915f 3813 }
f66dc81f
MH		 3814 status = L2CAP_CS_NO_INFO;
3815 }
79d554a6 3816 } else {
f93fa273 3817 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3818 result = L2CAP_CR_PEND;
3819 status = L2CAP_CS_AUTHEN_PEND;
3820 }
3821 } else {
f93fa273 3822 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3823 result = L2CAP_CR_PEND;
3824 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3825 }
3826
1da177e4 3827response:
8ffb9290 3828 l2cap_chan_unlock(pchan);
3df91ea2 3829 mutex_unlock(&conn->chan_lock);
a24cce14 3830 l2cap_chan_put(pchan);
1da177e4
LT		 3831
3832sendresp:
aca3192c
YH		 3833 rsp.scid = cpu_to_le16(scid);
3834 rsp.dcid = cpu_to_le16(dcid);
3835 rsp.result = cpu_to_le16(result);
3836 rsp.status = cpu_to_le16(status);
4c89b6aa 3837 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3838
3839 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3840 struct l2cap_info_req info;
dcf4adbf 3841 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3842
3843 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3844 conn->info_ident = l2cap_get_ident(conn);
3845
ba13ccd9 3846 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3847
2d792818
GP		 3848 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3849 sizeof(info), &info);
79d554a6
MH		 3850 }
3851
c1360a1c 3852 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3853 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3854 u8 buf[128];
c1360a1c 3855 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3856 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3857 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3858 chan->num_conf_req++;
e9aeb2dd 3859 }
1700915f
MM		 3860
3861 return chan;
4c89b6aa 3862}
e9aeb2dd 3863
4c89b6aa 3864static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3865 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3866{
7b064eda
JK		 3867 struct hci_dev *hdev = conn->hcon->hdev;
3868 struct hci_conn *hcon = conn->hcon;
3869
cb3b3152
JH		 3870 if (cmd_len < sizeof(struct l2cap_conn_req))
3871 return -EPROTO;
3872
7b064eda
JK		 3873 hci_dev_lock(hdev);
3874 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3875 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3876 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3877 hcon->dst_type, 0, NULL, 0,
3878 hcon->dev_class);
3879 hci_dev_unlock(hdev);
3880
300229f9 3881 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3882 return 0;
3883}
3884
5909cf30 3885static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3886 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3887 u8 *data)
1da177e4
LT		 3888{
3889 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3890 u16 scid, dcid, result, status;
48454079 3891 struct l2cap_chan *chan;
1da177e4 3892 u8 req[128];
3df91ea2 3893 int err;
1da177e4 3894
cb3b3152
JH		 3895 if (cmd_len < sizeof(*rsp))
3896 return -EPROTO;
3897
1da177e4
LT		 3898 scid = __le16_to_cpu(rsp->scid);
3899 dcid = __le16_to_cpu(rsp->dcid);
3900 result = __le16_to_cpu(rsp->result);
3901 status = __le16_to_cpu(rsp->status);
3902
1b009c98 3903 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3904 dcid, scid, result, status);
1da177e4 3905
3df91ea2
AE		 3906 mutex_lock(&conn->chan_lock);
3907
1da177e4 3908 if (scid) {
3df91ea2
AE		 3909 chan = __l2cap_get_chan_by_scid(conn, scid);
3910 if (!chan) {
21870b52 3911 err = -EBADSLT;
3df91ea2
AE		 3912 goto unlock;
3913 }
1da177e4 3914 } else {
3df91ea2
AE		 3915 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3916 if (!chan) {
21870b52 3917 err = -EBADSLT;
3df91ea2
AE		 3918 goto unlock;
3919 }
1da177e4
LT		 3920 }
3921
3df91ea2
AE		 3922 err = 0;
3923
6be36555 3924 l2cap_chan_lock(chan);
48454079 3925
1da177e4
LT		 3926 switch (result) {
3927 case L2CAP_CR_SUCCESS:
89bc500e 3928 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3929 chan->ident = 0;
fe4128e0 3930 chan->dcid = dcid;
c1360a1c 3931 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3932
c1360a1c 3933 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3934 break;
3935
1da177e4 3936 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3937 l2cap_build_conf_req(chan, req), req);
73ffa904 3938 chan->num_conf_req++;
1da177e4
LT		 3939 break;
3940
3941 case L2CAP_CR_PEND:
c1360a1c 3942 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3943 break;
3944
3945 default:
48454079 3946 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3947 break;
3948 }
3949
6be36555 3950 l2cap_chan_unlock(chan);
3df91ea2
AE		 3951
3952unlock:
3953 mutex_unlock(&conn->chan_lock);
3954
3955 return err;
1da177e4
LT		 3956}
3957
47d1ec61 3958static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3959{
3960 /* FCS is enabled only in ERTM or streaming mode, if one or both
3961 * sides request it.
3962 */
0c1bc5c6 3963 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3964 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3965 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3966 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3967}
3968
29d8a590
AE		 3969static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3970 u8 ident, u16 flags)
3971{
3972 struct l2cap_conn *conn = chan->conn;
3973
3974 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3975 flags);
3976
3977 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3978 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3979
3980 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3981 l2cap_build_conf_rsp(chan, data,
3982 L2CAP_CONF_SUCCESS, flags), data);
3983}
3984
662d652d
JH		 3985static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
3986 u16 scid, u16 dcid)
3987{
3988 struct l2cap_cmd_rej_cid rej;
3989
dcf4adbf 3990 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
662d652d
JH		 3991 rej.scid = __cpu_to_le16(scid);
3992 rej.dcid = __cpu_to_le16(dcid);
3993
3994 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3995}
3996
2d792818
GP		 3997static inline int l2cap_config_req(struct l2cap_conn *conn,
3998 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3999 u8 *data)
1da177e4
LT		 4000{
4001 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4002 u16 dcid, flags;
4003 u8 rsp[64];
48454079 4004 struct l2cap_chan *chan;
3c588192 4005 int len, err = 0;
1da177e4 4006
cb3b3152
JH		 4007 if (cmd_len < sizeof(*req))
4008 return -EPROTO;
4009
1da177e4
LT		 4010 dcid = __le16_to_cpu(req->dcid);
4011 flags = __le16_to_cpu(req->flags);
4012
4013 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4014
baa7e1fa 4015 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4016 if (!chan) {
4017 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4018 return 0;
4019 }
1da177e4 4020
033b1142 4021 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4022 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4023 chan->dcid);
354f60a9 4024 goto unlock;
df6bd743 4025 }
354f60a9 4026
5dee9e7c 4027 /* Reject if config buffer is too small. */
88219a0f 4028 len = cmd_len - sizeof(*req);
cb3b3152 4029 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4030 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4031 l2cap_build_conf_rsp(chan, rsp,
4032 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4033 goto unlock;
4034 }
4035
4036 /* Store config. */
73ffa904
GP		 4037 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4038 chan->conf_len += len;
1da177e4 4039
59e54bd1 4040 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4041 /* Incomplete config. Send empty response. */
4042 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4043 l2cap_build_conf_rsp(chan, rsp,
4044 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4045 goto unlock;
4046 }
4047
4048 /* Complete config. */
73ffa904 4049 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4050 if (len < 0) {
5e4e3972 4051 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4052 goto unlock;
f2fcfcd6 4053 }
1da177e4 4054
1500109b 4055 chan->ident = cmd->ident;
5dee9e7c 4056 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4057 chan->num_conf_rsp++;
5dee9e7c 4058
5dee9e7c 4059 /* Reset config buffer. */
73ffa904 4060 chan->conf_len = 0;
5dee9e7c 4061
c1360a1c 4062 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4063 goto unlock;
4064
c1360a1c 4065 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4066 set_default_fcs(chan);
fcc203c3 4067
105bdf9e
MM		 4068 if (chan->mode == L2CAP_MODE_ERTM ||
4069 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4070 err = l2cap_ertm_init(chan);
4071
4072 if (err < 0)
5e4e3972 4073 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4074 else
4075 l2cap_chan_ready(chan);
0565c1c2 4076
876d9484
MH		 4077 goto unlock;
4078 }
4079
c1360a1c 4080 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4081 u8 buf[64];
1da177e4 4082 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4083 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4084 chan->num_conf_req++;
1da177e4
LT		 4085 }
4086
0e8b207e
AE		 4087 /* Got Conf Rsp PENDING from remote side and asume we sent
4088 Conf Rsp PENDING in the code above */
4089 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4090 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4091
4092 /* check compatibility */
4093
79de886d 4094 /* Send rsp for BR/EDR channel */
f351bc72 4095 if (!chan->hs_hcon)
79de886d
AE		 4096 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4097 else
4098 chan->ident = cmd->ident;
0e8b207e
AE		 4099 }
4100
1da177e4 4101unlock:
6be36555 4102 l2cap_chan_unlock(chan);
3c588192 4103 return err;
1da177e4
LT		 4104}
4105
2d792818 4106static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4107 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4108 u8 *data)
1da177e4
LT		 4109{
4110 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4111 u16 scid, flags, result;
48454079 4112 struct l2cap_chan *chan;
cb3b3152 4113 int len = cmd_len - sizeof(*rsp);
3c588192 4114 int err = 0;
1da177e4 4115
cb3b3152
JH		 4116 if (cmd_len < sizeof(*rsp))
4117 return -EPROTO;
4118
1da177e4
LT		 4119 scid = __le16_to_cpu(rsp->scid);
4120 flags = __le16_to_cpu(rsp->flags);
4121 result = __le16_to_cpu(rsp->result);
4122
61386cba
AE		 4123 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4124 result, len);
1da177e4 4125
baa7e1fa 4126 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4127 if (!chan)
1da177e4
LT		 4128 return 0;
4129
4130 switch (result) {
4131 case L2CAP_CONF_SUCCESS:
47d1ec61 4132 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4133 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4134 break;
4135
0e8b207e
AE		 4136 case L2CAP_CONF_PENDING:
4137 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4138
4139 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4140 char buf[64];
4141
4142 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4143 buf, &result);
0e8b207e 4144 if (len < 0) {
5e4e3972 4145 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4146 goto done;
4147 }
4148
f351bc72 4149 if (!chan->hs_hcon) {
79de886d
AE		 4150 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4151 0);
5ce66b59
AE		 4152 } else {
4153 if (l2cap_check_efs(chan)) {
4154 amp_create_logical_link(chan);
4155 chan->ident = cmd->ident;
4156 }
4157 }
0e8b207e
AE		 4158 }
4159 goto done;
4160
1da177e4 4161 case L2CAP_CONF_UNACCEPT:
73ffa904 4162 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4163 char req[64];
4164
c2c77ec8 4165 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4166 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4167 goto done;
4168 }
4169
f2fcfcd6
GP		 4170 /* throw out any old stored conf requests */
4171 result = L2CAP_CONF_SUCCESS;
b4450035 4172 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4173 req, &result);
f2fcfcd6 4174 if (len < 0) {
5e4e3972 4175 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4176 goto done;
4177 }
4178
4179 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4180 L2CAP_CONF_REQ, len, req);
73ffa904 4181 chan->num_conf_req++;
f2fcfcd6
GP		 4182 if (result != L2CAP_CONF_SUCCESS)
4183 goto done;
4184 break;
1da177e4
LT		 4185 }
4186
8e87d142 4187 default:
6be36555 4188 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4189
ba13ccd9 4190 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4191 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4192 goto done;
4193 }
4194
59e54bd1 4195 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4196 goto done;
4197
c1360a1c 4198 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4199
c1360a1c 4200 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4201 set_default_fcs(chan);
fcc203c3 4202
105bdf9e
MM		 4203 if (chan->mode == L2CAP_MODE_ERTM ||
4204 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4205 err = l2cap_ertm_init(chan);
0565c1c2 4206
3c588192 4207 if (err < 0)
5e4e3972 4208 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4209 else
4210 l2cap_chan_ready(chan);
1da177e4
LT		 4211 }
4212
4213done:
6be36555 4214 l2cap_chan_unlock(chan);
3c588192 4215 return err;
1da177e4
LT		 4216}
4217
2d792818 4218static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4219 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4220 u8 *data)
1da177e4
LT		 4221{
4222 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4223 struct l2cap_disconn_rsp rsp;
4224 u16 dcid, scid;
48454079 4225 struct l2cap_chan *chan;
1da177e4 4226
cb3b3152
JH		 4227 if (cmd_len != sizeof(*req))
4228 return -EPROTO;
4229
1da177e4
LT		 4230 scid = __le16_to_cpu(req->scid);
4231 dcid = __le16_to_cpu(req->dcid);
4232
4233 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4234
3df91ea2
AE		 4235 mutex_lock(&conn->chan_lock);
4236
4237 chan = __l2cap_get_chan_by_scid(conn, dcid);
4238 if (!chan) {
4239 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4240 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4241 return 0;
3df91ea2 4242 }
1da177e4 4243
6be36555
AE		 4244 l2cap_chan_lock(chan);
4245
fe4128e0
GP		 4246 rsp.dcid = cpu_to_le16(chan->scid);
4247 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4248 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4249
5ec1bbe5 4250 chan->ops->set_shutdown(chan);
1da177e4 4251
61d6ef3e 4252 l2cap_chan_hold(chan);
48454079 4253 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4254
4255 l2cap_chan_unlock(chan);
1da177e4 4256
80b98027 4257 chan->ops->close(chan);
61d6ef3e 4258 l2cap_chan_put(chan);
3df91ea2
AE		 4259
4260 mutex_unlock(&conn->chan_lock);
4261
1da177e4
LT		 4262 return 0;
4263}
4264
2d792818 4265static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4266 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4267 u8 *data)
1da177e4
LT		 4268{
4269 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4270 u16 dcid, scid;
48454079 4271 struct l2cap_chan *chan;
1da177e4 4272
cb3b3152
JH		 4273 if (cmd_len != sizeof(*rsp))
4274 return -EPROTO;
4275
1da177e4
LT		 4276 scid = __le16_to_cpu(rsp->scid);
4277 dcid = __le16_to_cpu(rsp->dcid);
4278
4279 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4280
3df91ea2
AE		 4281 mutex_lock(&conn->chan_lock);
4282
4283 chan = __l2cap_get_chan_by_scid(conn, scid);
4284 if (!chan) {
4285 mutex_unlock(&conn->chan_lock);
1da177e4 4286 return 0;
3df91ea2 4287 }
1da177e4 4288
6be36555 4289 l2cap_chan_lock(chan);
48454079 4290
61d6ef3e 4291 l2cap_chan_hold(chan);
48454079 4292 l2cap_chan_del(chan, 0);
6be36555
AE		 4293
4294 l2cap_chan_unlock(chan);
1da177e4 4295
80b98027 4296 chan->ops->close(chan);
61d6ef3e 4297 l2cap_chan_put(chan);
3df91ea2
AE		 4298
4299 mutex_unlock(&conn->chan_lock);
4300
1da177e4
LT		 4301 return 0;
4302}
4303
2d792818 4304static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4305 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4306 u8 *data)
1da177e4
LT		 4307{
4308 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4309 u16 type;
4310
cb3b3152
JH		 4311 if (cmd_len != sizeof(*req))
4312 return -EPROTO;
4313
1da177e4
LT		 4314 type = __le16_to_cpu(req->type);
4315
4316 BT_DBG("type 0x%4.4x", type);
4317
f0709e03
MH		 4318 if (type == L2CAP_IT_FEAT_MASK) {
4319 u8 buf[8];
44dd46de 4320 u32 feat_mask = l2cap_feat_mask;
f0709e03 4321 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
dcf4adbf
JP		 4322 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4323 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4324 if (!disable_ertm)
fcc203c3 4325 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4326 | L2CAP_FEAT_FCS;
848566b3 4327 if (conn->hs_enabled)
6327eb98 4328 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4329 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4330
1b7bf4ed 4331 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4332 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4333 buf);
e1027a7c
MH		 4334 } else if (type == L2CAP_IT_FIXED_CHAN) {
4335 u8 buf[12];
4336 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4337
848566b3 4338 if (conn->hs_enabled)
50a147cd
MM		 4339 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4340 else
4341 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4342
dcf4adbf
JP		 4343 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4344 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4345 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4346 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4347 buf);
f0709e03
MH		 4348 } else {
4349 struct l2cap_info_rsp rsp;
4350 rsp.type = cpu_to_le16(type);
dcf4adbf 4351 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4352 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4353 &rsp);
f0709e03 4354 }
1da177e4
LT		 4355
4356 return 0;
4357}
4358
2d792818 4359static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4360 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4361 u8 *data)
1da177e4
LT		 4362{
4363 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4364 u16 type, result;
4365
3f6fa3d4 4366 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4367 return -EPROTO;
4368
1da177e4
LT		 4369 type = __le16_to_cpu(rsp->type);
4370 result = __le16_to_cpu(rsp->result);
4371
4372 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4373
e90165be
AE		 4374 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4375 if (cmd->ident != conn->info_ident ||
2d792818 4376 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4377 return 0;
4378
17cd3f37 4379 cancel_delayed_work(&conn->info_timer);
4e8402a3 4380
adb08ede
VT		 4381 if (result != L2CAP_IR_SUCCESS) {
4382 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4383 conn->info_ident = 0;
4384
4385 l2cap_conn_start(conn);
4386
4387 return 0;
4388 }
4389
978c93b9
AE		 4390 switch (type) {
4391 case L2CAP_IT_FEAT_MASK:
83985319 4392 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4393
47ec1dcd 4394 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4395 struct l2cap_info_req req;
dcf4adbf 4396 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4397
4398 conn->info_ident = l2cap_get_ident(conn);
4399
4400 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4401 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4402 } else {
4403 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4404 conn->info_ident = 0;
4405
4406 l2cap_conn_start(conn);
4407 }
978c93b9
AE		 4408 break;
4409
4410 case L2CAP_IT_FIXED_CHAN:
4411 conn->fixed_chan_mask = rsp->data[0];
984947dc 4412 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4413 conn->info_ident = 0;
984947dc
MH		 4414
4415 l2cap_conn_start(conn);
978c93b9 4416 break;
984947dc 4417 }
4e8402a3 4418
1da177e4
LT		 4419 return 0;
4420}
4421
1700915f
MM		 4422static int l2cap_create_channel_req(struct l2cap_conn *conn,
4423 struct l2cap_cmd_hdr *cmd,
4424 u16 cmd_len, void *data)
f94ff6ff
MM		 4425{
4426 struct l2cap_create_chan_req *req = data;
6e1df6a6 4427 struct l2cap_create_chan_rsp rsp;
1700915f 4428 struct l2cap_chan *chan;
6e1df6a6 4429 struct hci_dev *hdev;
f94ff6ff
MM		 4430 u16 psm, scid;
4431
4432 if (cmd_len != sizeof(*req))
4433 return -EPROTO;
4434
848566b3 4435 if (!conn->hs_enabled)
f94ff6ff
MM		 4436 return -EINVAL;
4437
4438 psm = le16_to_cpu(req->psm);
4439 scid = le16_to_cpu(req->scid);
4440
ad0ac6ca 4441 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4442
6e1df6a6 4443 /* For controller id 0 make BR/EDR connection */
6ed971ca 4444 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4445 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4446 req->amp_id);
4447 return 0;
4448 }
1700915f 4449
6e1df6a6
AE		 4450 /* Validate AMP controller id */
4451 hdev = hci_dev_get(req->amp_id);
4452 if (!hdev)
4453 goto error;
1700915f 4454
6e1df6a6
AE		 4455 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4456 hci_dev_put(hdev);
4457 goto error;
4458 }
1700915f 4459
6e1df6a6
AE		 4460 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4461 req->amp_id);
4462 if (chan) {
4463 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4464 struct hci_conn *hs_hcon;
1700915f 4465
98e0f7ea
MH		 4466 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4467 &conn->hcon->dst);
6e1df6a6
AE		 4468 if (!hs_hcon) {
4469 hci_dev_put(hdev);
662d652d
JH		 4470 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4471 chan->dcid);
4472 return 0;
1700915f
MM		 4473 }
4474
6e1df6a6
AE		 4475 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4476
6e1df6a6
AE		 4477 mgr->bredr_chan = chan;
4478 chan->hs_hcon = hs_hcon;
fd45bf4c 4479 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4480 conn->mtu = hdev->block_mtu;
1700915f 4481 }
f94ff6ff 4482
6e1df6a6 4483 hci_dev_put(hdev);
f94ff6ff
MM		 4484
4485 return 0;
6e1df6a6
AE		 4486
4487error:
4488 rsp.dcid = 0;
4489 rsp.scid = cpu_to_le16(scid);
dcf4adbf
JP		 4490 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4491 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
6e1df6a6
AE		 4492
4493 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4494 sizeof(rsp), &rsp);
4495
dc280801 4496 return 0;
f94ff6ff
MM		 4497}
4498
8eb200bd
MM		 4499static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4500{
4501 struct l2cap_move_chan_req req;
4502 u8 ident;
4503
4504 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4505
4506 ident = l2cap_get_ident(chan->conn);
4507 chan->ident = ident;
4508
4509 req.icid = cpu_to_le16(chan->scid);
4510 req.dest_amp_id = dest_amp_id;
4511
4512 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4513 &req);
4514
4515 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4516}
4517
1500109b 4518static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4519{
4520 struct l2cap_move_chan_rsp rsp;
4521
1500109b 4522 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4523
1500109b 4524 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4525 rsp.result = cpu_to_le16(result);
4526
1500109b
MM		 4527 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4528 sizeof(rsp), &rsp);
8d5a04a1
MM		 4529}
4530
5b155ef9 4531static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4532{
4533 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4534
5b155ef9 4535 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4536
5b155ef9 4537 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4538
5b155ef9 4539 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4540 cfm.result = cpu_to_le16(result);
4541
5b155ef9
MM		 4542 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4543 sizeof(cfm), &cfm);
4544
4545 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4546}
4547
4548static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4549{
4550 struct l2cap_move_chan_cfm cfm;
4551
4552 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4553
4554 cfm.icid = cpu_to_le16(icid);
dcf4adbf 4555 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
5b155ef9
MM		 4556
4557 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4558 sizeof(cfm), &cfm);
8d5a04a1
MM		 4559}
4560
4561static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4562 u16 icid)
8d5a04a1
MM		 4563{
4564 struct l2cap_move_chan_cfm_rsp rsp;
4565
ad0ac6ca 4566 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4567
4568 rsp.icid = cpu_to_le16(icid);
4569 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4570}
4571
5f3847a4
MM		 4572static void __release_logical_link(struct l2cap_chan *chan)
4573{
4574 chan->hs_hchan = NULL;
4575 chan->hs_hcon = NULL;
4576
4577 /* Placeholder - release the logical link */
4578}
4579
1500109b
MM		 4580static void l2cap_logical_fail(struct l2cap_chan *chan)
4581{
4582 /* Logical link setup failed */
4583 if (chan->state != BT_CONNECTED) {
4584 /* Create channel failure, disconnect */
5e4e3972 4585 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4586 return;
4587 }
4588
4589 switch (chan->move_role) {
4590 case L2CAP_MOVE_ROLE_RESPONDER:
4591 l2cap_move_done(chan);
4592 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4593 break;
4594 case L2CAP_MOVE_ROLE_INITIATOR:
4595 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4596 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4597 /* Remote has only sent pending or
4598 * success responses, clean up
4599 */
4600 l2cap_move_done(chan);
4601 }
4602
4603 /* Other amp move states imply that the move
4604 * has already aborted
4605 */
4606 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4607 break;
4608 }
4609}
4610
4611static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4612 struct hci_chan *hchan)
4613{
4614 struct l2cap_conf_rsp rsp;
1500109b 4615
336178a3 4616 chan->hs_hchan = hchan;
1500109b
MM		 4617 chan->hs_hcon->l2cap_data = chan->conn;
4618
35ba9561 4619 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4620
4621 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4622 int err;
1500109b
MM		 4623
4624 set_default_fcs(chan);
4625
4626 err = l2cap_ertm_init(chan);
4627 if (err < 0)
5e4e3972 4628 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4629 else
4630 l2cap_chan_ready(chan);
4631 }
4632}
4633
4634static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4635 struct hci_chan *hchan)
4636{
4637 chan->hs_hcon = hchan->conn;
4638 chan->hs_hcon->l2cap_data = chan->conn;
4639
4640 BT_DBG("move_state %d", chan->move_state);
4641
4642 switch (chan->move_state) {
4643 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4644 /* Move confirm will be sent after a success
4645 * response is received
4646 */
4647 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4648 break;
4649 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4650 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4651 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4652 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4653 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4654 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4655 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4656 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4657 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4658 }
4659 break;
4660 default:
4661 /* Move was not in expected state, free the channel */
4662 __release_logical_link(chan);
4663
4664 chan->move_state = L2CAP_MOVE_STABLE;
4665 }
4666}
4667
4668/* Call with chan locked */
27695fb4
AE		 4669void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4670 u8 status)
5b155ef9 4671{
1500109b
MM		 4672 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4673
4674 if (status) {
4675 l2cap_logical_fail(chan);
4676 __release_logical_link(chan);
4677 return;
4678 }
4679
4680 if (chan->state != BT_CONNECTED) {
4681 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4682 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4683 l2cap_logical_finish_create(chan, hchan);
4684 } else {
4685 l2cap_logical_finish_move(chan, hchan);
4686 }
5b155ef9
MM		 4687}
4688
3f7a56c4
MM		 4689void l2cap_move_start(struct l2cap_chan *chan)
4690{
4691 BT_DBG("chan %p", chan);
4692
6ed971ca 4693 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4694 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4695 return;
4696 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4697 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4698 /* Placeholder - start physical link setup */
4699 } else {
4700 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4701 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4702 chan->move_id = 0;
4703 l2cap_move_setup(chan);
4704 l2cap_send_move_chan_req(chan, 0);
4705 }
4706}
4707
8eb200bd
MM		 4708static void l2cap_do_create(struct l2cap_chan *chan, int result,
4709 u8 local_amp_id, u8 remote_amp_id)
4710{
62748ca1
AE		 4711 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4712 local_amp_id, remote_amp_id);
4713
12d6cc60
AE		 4714 chan->fcs = L2CAP_FCS_NONE;
4715
62748ca1
AE		 4716 /* Outgoing channel on AMP */
4717 if (chan->state == BT_CONNECT) {
4718 if (result == L2CAP_CR_SUCCESS) {
4719 chan->local_amp_id = local_amp_id;
4720 l2cap_send_create_chan_req(chan, remote_amp_id);
4721 } else {
4722 /* Revert to BR/EDR connect */
4723 l2cap_send_conn_req(chan);
4724 }
4725
4726 return;
4727 }
4728
4729 /* Incoming channel on AMP */
4730 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4731 struct l2cap_conn_rsp rsp;
4732 char buf[128];
4733 rsp.scid = cpu_to_le16(chan->dcid);
4734 rsp.dcid = cpu_to_le16(chan->scid);
4735
8eb200bd
MM		 4736 if (result == L2CAP_CR_SUCCESS) {
4737 /* Send successful response */
dcf4adbf
JP		 4738 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4739 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4740 } else {
4741 /* Send negative response */
dcf4adbf
JP		 4742 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4743 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4744 }
4745
4746 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4747 sizeof(rsp), &rsp);
4748
4749 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4750 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4751 set_bit(CONF_REQ_SENT, &chan->conf_state);
4752 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4753 L2CAP_CONF_REQ,
4754 l2cap_build_conf_req(chan, buf), buf);
4755 chan->num_conf_req++;
4756 }
8eb200bd
MM		 4757 }
4758}
4759
4760static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4761 u8 remote_amp_id)
4762{
4763 l2cap_move_setup(chan);
4764 chan->move_id = local_amp_id;
4765 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4766
4767 l2cap_send_move_chan_req(chan, remote_amp_id);
4768}
4769
4770static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4771{
4772 struct hci_chan *hchan = NULL;
4773
4774 /* Placeholder - get hci_chan for logical link */
4775
4776 if (hchan) {
4777 if (hchan->state == BT_CONNECTED) {
4778 /* Logical link is ready to go */
4779 chan->hs_hcon = hchan->conn;
4780 chan->hs_hcon->l2cap_data = chan->conn;
4781 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4782 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4783
4784 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4785 } else {
4786 /* Wait for logical link to be ready */
4787 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4788 }
4789 } else {
4790 /* Logical link not available */
4791 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4792 }
4793}
4794
4795static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4796{
4797 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4798 u8 rsp_result;
4799 if (result == -EINVAL)
4800 rsp_result = L2CAP_MR_BAD_ID;
4801 else
4802 rsp_result = L2CAP_MR_NOT_ALLOWED;
4803
4804 l2cap_send_move_chan_rsp(chan, rsp_result);
4805 }
4806
4807 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4808 chan->move_state = L2CAP_MOVE_STABLE;
4809
4810 /* Restart data transmission */
4811 l2cap_ertm_send(chan);
4812}
4813
a514b17f
AE		 4814/* Invoke with locked chan */
4815void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4816{
770bfefa 4817 u8 local_amp_id = chan->local_amp_id;
fffadc08 4818 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4819
8eb200bd
MM		 4820 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4821 chan, result, local_amp_id, remote_amp_id);
4822
8eb200bd
MM		 4823 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4824 l2cap_chan_unlock(chan);
4825 return;
4826 }
4827
4828 if (chan->state != BT_CONNECTED) {
4829 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4830 } else if (result != L2CAP_MR_SUCCESS) {
4831 l2cap_do_move_cancel(chan, result);
4832 } else {
4833 switch (chan->move_role) {
4834 case L2CAP_MOVE_ROLE_INITIATOR:
4835 l2cap_do_move_initiate(chan, local_amp_id,
4836 remote_amp_id);
4837 break;
4838 case L2CAP_MOVE_ROLE_RESPONDER:
4839 l2cap_do_move_respond(chan, result);
4840 break;
4841 default:
4842 l2cap_do_move_cancel(chan, result);
4843 break;
4844 }
4845 }
8eb200bd
MM		 4846}
4847
8d5a04a1 4848static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4849 struct l2cap_cmd_hdr *cmd,
4850 u16 cmd_len, void *data)
8d5a04a1
MM		 4851{
4852 struct l2cap_move_chan_req *req = data;
1500109b 4853 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4854 struct l2cap_chan *chan;
8d5a04a1
MM		 4855 u16 icid = 0;
4856 u16 result = L2CAP_MR_NOT_ALLOWED;
4857
4858 if (cmd_len != sizeof(*req))
4859 return -EPROTO;
4860
4861 icid = le16_to_cpu(req->icid);
4862
ad0ac6ca 4863 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4864
848566b3 4865 if (!conn->hs_enabled)
8d5a04a1
MM		 4866 return -EINVAL;
4867
02b0fbb9
MM		 4868 chan = l2cap_get_chan_by_dcid(conn, icid);
4869 if (!chan) {
1500109b 4870 rsp.icid = cpu_to_le16(icid);
dcf4adbf 4871 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
1500109b
MM		 4872 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4873 sizeof(rsp), &rsp);
02b0fbb9
MM		 4874 return 0;
4875 }
4876
1500109b
MM		 4877 chan->ident = cmd->ident;
4878
02b0fbb9
MM		 4879 if (chan->scid < L2CAP_CID_DYN_START ||
4880 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4881 (chan->mode != L2CAP_MODE_ERTM &&
4882 chan->mode != L2CAP_MODE_STREAMING)) {
4883 result = L2CAP_MR_NOT_ALLOWED;
4884 goto send_move_response;
4885 }
4886
4887 if (chan->local_amp_id == req->dest_amp_id) {
4888 result = L2CAP_MR_SAME_ID;
4889 goto send_move_response;
4890 }
4891
6ed971ca 4892 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4893 struct hci_dev *hdev;
4894 hdev = hci_dev_get(req->dest_amp_id);
4895 if (!hdev || hdev->dev_type != HCI_AMP ||
4896 !test_bit(HCI_UP, &hdev->flags)) {
4897 if (hdev)
4898 hci_dev_put(hdev);
4899
4900 result = L2CAP_MR_BAD_ID;
4901 goto send_move_response;
4902 }
4903 hci_dev_put(hdev);
4904 }
4905
4906 /* Detect a move collision. Only send a collision response
4907 * if this side has "lost", otherwise proceed with the move.
4908 * The winner has the larger bd_addr.
4909 */
4910 if ((__chan_is_moving(chan) ||
4911 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4912 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4913 result = L2CAP_MR_COLLISION;
4914 goto send_move_response;
4915 }
4916
02b0fbb9
MM		 4917 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4918 l2cap_move_setup(chan);
4919 chan->move_id = req->dest_amp_id;
4920 icid = chan->dcid;
4921
6ed971ca 4922 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4923 /* Moving to BR/EDR */
4924 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4925 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4926 result = L2CAP_MR_PEND;
4927 } else {
4928 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4929 result = L2CAP_MR_SUCCESS;
4930 }
4931 } else {
4932 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4933 /* Placeholder - uncomment when amp functions are available */
4934 /*amp_accept_physical(chan, req->dest_amp_id);*/
4935 result = L2CAP_MR_PEND;
4936 }
4937
4938send_move_response:
1500109b 4939 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4940
02b0fbb9
MM		 4941 l2cap_chan_unlock(chan);
4942
8d5a04a1
MM		 4943 return 0;
4944}
4945
5b155ef9
MM		 4946static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4947{
4948 struct l2cap_chan *chan;
4949 struct hci_chan *hchan = NULL;
4950
4951 chan = l2cap_get_chan_by_scid(conn, icid);
4952 if (!chan) {
4953 l2cap_send_move_chan_cfm_icid(conn, icid);
4954 return;
4955 }
4956
4957 __clear_chan_timer(chan);
4958 if (result == L2CAP_MR_PEND)
4959 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4960
4961 switch (chan->move_state) {
4962 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4963 /* Move confirm will be sent when logical link
4964 * is complete.
4965 */
4966 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4967 break;
4968 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4969 if (result == L2CAP_MR_PEND) {
4970 break;
4971 } else if (test_bit(CONN_LOCAL_BUSY,
4972 &chan->conn_state)) {
4973 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4974 } else {
4975 /* Logical link is up or moving to BR/EDR,
4976 * proceed with move
4977 */
4978 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4979 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4980 }
4981 break;
4982 case L2CAP_MOVE_WAIT_RSP:
4983 /* Moving to AMP */
4984 if (result == L2CAP_MR_SUCCESS) {
4985 /* Remote is ready, send confirm immediately
4986 * after logical link is ready
4987 */
4988 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4989 } else {
4990 /* Both logical link and move success
4991 * are required to confirm
4992 */
4993 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4994 }
4995
4996 /* Placeholder - get hci_chan for logical link */
4997 if (!hchan) {
4998 /* Logical link not available */
4999 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5000 break;
5001 }
5002
5003 /* If the logical link is not yet connected, do not
5004 * send confirmation.
5005 */
5006 if (hchan->state != BT_CONNECTED)
5007 break;
5008
5009 /* Logical link is already ready to go */
5010
5011 chan->hs_hcon = hchan->conn;
5012 chan->hs_hcon->l2cap_data = chan->conn;
5013
5014 if (result == L2CAP_MR_SUCCESS) {
5015 /* Can confirm now */
5016 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5017 } else {
5018 /* Now only need move success
5019 * to confirm
5020 */
5021 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5022 }
5023
5024 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5025 break;
5026 default:
5027 /* Any other amp move state means the move failed. */
5028 chan->move_id = chan->local_amp_id;
5029 l2cap_move_done(chan);
5030 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5031 }
5032
5033 l2cap_chan_unlock(chan);
5034}
5035
5036static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5037 u16 result)
5038{
5039 struct l2cap_chan *chan;
5040
5041 chan = l2cap_get_chan_by_ident(conn, ident);
5042 if (!chan) {
5043 /* Could not locate channel, icid is best guess */
5044 l2cap_send_move_chan_cfm_icid(conn, icid);
5045 return;
5046 }
5047
5048 __clear_chan_timer(chan);
5049
5050 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5051 if (result == L2CAP_MR_COLLISION) {
5052 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5053 } else {
5054 /* Cleanup - cancel move */
5055 chan->move_id = chan->local_amp_id;
5056 l2cap_move_done(chan);
5057 }
5058 }
5059
5060 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5061
5062 l2cap_chan_unlock(chan);
5063}
5064
5065static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5066 struct l2cap_cmd_hdr *cmd,
5067 u16 cmd_len, void *data)
8d5a04a1
MM		 5068{
5069 struct l2cap_move_chan_rsp *rsp = data;
5070 u16 icid, result;
5071
5072 if (cmd_len != sizeof(*rsp))
5073 return -EPROTO;
5074
5075 icid = le16_to_cpu(rsp->icid);
5076 result = le16_to_cpu(rsp->result);
5077
ad0ac6ca 5078 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5079
5b155ef9
MM		 5080 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5081 l2cap_move_continue(conn, icid, result);
5082 else
5083 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5084
5085 return 0;
5086}
5087
5f3847a4
MM		 5088static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5089 struct l2cap_cmd_hdr *cmd,
5090 u16 cmd_len, void *data)
8d5a04a1
MM		 5091{
5092 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5093 struct l2cap_chan *chan;
8d5a04a1
MM		 5094 u16 icid, result;
5095
5096 if (cmd_len != sizeof(*cfm))
5097 return -EPROTO;
5098
5099 icid = le16_to_cpu(cfm->icid);
5100 result = le16_to_cpu(cfm->result);
5101
ad0ac6ca 5102 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5103
5f3847a4
MM		 5104 chan = l2cap_get_chan_by_dcid(conn, icid);
5105 if (!chan) {
5106 /* Spec requires a response even if the icid was not found */
5107 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5108 return 0;
5109 }
5110
5111 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5112 if (result == L2CAP_MC_CONFIRMED) {
5113 chan->local_amp_id = chan->move_id;
6ed971ca 5114 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5115 __release_logical_link(chan);
5116 } else {
5117 chan->move_id = chan->local_amp_id;
5118 }
5119
5120 l2cap_move_done(chan);
5121 }
5122
8d5a04a1
MM		 5123 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5124
5f3847a4
MM		 5125 l2cap_chan_unlock(chan);
5126
8d5a04a1
MM		 5127 return 0;
5128}
5129
5130static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5131 struct l2cap_cmd_hdr *cmd,
5132 u16 cmd_len, void *data)
8d5a04a1
MM		 5133{
5134 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5135 struct l2cap_chan *chan;
8d5a04a1
MM		 5136 u16 icid;
5137
5138 if (cmd_len != sizeof(*rsp))
5139 return -EPROTO;
5140
5141 icid = le16_to_cpu(rsp->icid);
5142
ad0ac6ca 5143 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5144
3fd71a0a
MM		 5145 chan = l2cap_get_chan_by_scid(conn, icid);
5146 if (!chan)
5147 return 0;
5148
5149 __clear_chan_timer(chan);
5150
5151 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5152 chan->local_amp_id = chan->move_id;
5153
6ed971ca 5154 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5155 __release_logical_link(chan);
5156
5157 l2cap_move_done(chan);
5158 }
5159
5160 l2cap_chan_unlock(chan);
5161
8d5a04a1
MM		 5162 return 0;
5163}
5164
de73115a 5165static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5166 struct l2cap_cmd_hdr *cmd,
203e639e 5167 u16 cmd_len, u8 *data)
de73115a
CT		 5168{
5169 struct hci_conn *hcon = conn->hcon;
5170 struct l2cap_conn_param_update_req *req;
5171 struct l2cap_conn_param_update_rsp rsp;
203e639e 5172 u16 min, max, latency, to_multiplier;
2ce603eb 5173 int err;
de73115a 5174
40bef302 5175 if (hcon->role != HCI_ROLE_MASTER)
de73115a
CT		 5176 return -EINVAL;
5177
de73115a
CT		 5178 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5179 return -EPROTO;
5180
5181 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5182 min = __le16_to_cpu(req->min);
5183 max = __le16_to_cpu(req->max);
de73115a
CT		 5184 latency = __le16_to_cpu(req->latency);
5185 to_multiplier = __le16_to_cpu(req->to_multiplier);
5186
5187 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5188 min, max, latency, to_multiplier);
de73115a
CT		 5189
5190 memset(&rsp, 0, sizeof(rsp));
2ce603eb 5191
d4905f24 5192 err = hci_check_conn_params(min, max, latency, to_multiplier);
2ce603eb 5193 if (err)
dcf4adbf 5194 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5195 else
dcf4adbf 5196 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5197
5198 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5199 sizeof(rsp), &rsp);
de73115a 5200
ffb5a827 5201 if (!err) {
f4869e2a
JH		 5202 u8 store_hint;
5203
5204 store_hint = hci_le_conn_update(hcon, min, max, latency,
5205 to_multiplier);
ffb5a827 5206 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
f4869e2a
JH		 5207 store_hint, min, max, latency,
5208 to_multiplier);
ffb5a827 5209
ffb5a827 5210 }
2ce603eb 5211
de73115a
CT		 5212 return 0;
5213}
5214
f1496dee
JH		 5215static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5216 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5217 u8 *data)
5218{
5219 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5220 u16 dcid, mtu, mps, credits, result;
5221 struct l2cap_chan *chan;
5222 int err;
5223
5224 if (cmd_len < sizeof(*rsp))
5225 return -EPROTO;
5226
5227 dcid = __le16_to_cpu(rsp->dcid);
5228 mtu = __le16_to_cpu(rsp->mtu);
5229 mps = __le16_to_cpu(rsp->mps);
5230 credits = __le16_to_cpu(rsp->credits);
5231 result = __le16_to_cpu(rsp->result);
5232
5233 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5234 return -EPROTO;
5235
5236 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5237 dcid, mtu, mps, credits, result);
5238
5239 mutex_lock(&conn->chan_lock);
5240
5241 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5242 if (!chan) {
5243 err = -EBADSLT;
5244 goto unlock;
5245 }
5246
5247 err = 0;
5248
5249 l2cap_chan_lock(chan);
5250
5251 switch (result) {
5252 case L2CAP_CR_SUCCESS:
5253 chan->ident = 0;
5254 chan->dcid = dcid;
5255 chan->omtu = mtu;
5256 chan->remote_mps = mps;
0cd75f7e 5257 chan->tx_credits = credits;
f1496dee
JH		 5258 l2cap_chan_ready(chan);
5259 break;
5260
5261 default:
5262 l2cap_chan_del(chan, ECONNREFUSED);
5263 break;
5264 }
5265
5266 l2cap_chan_unlock(chan);
5267
5268unlock:
5269 mutex_unlock(&conn->chan_lock);
5270
5271 return err;
5272}
5273
3300d9a9 5274static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5275 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5276 u8 *data)
3300d9a9
CT		 5277{
5278 int err = 0;
5279
5280 switch (cmd->code) {
5281 case L2CAP_COMMAND_REJ:
cb3b3152 5282 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5283 break;
5284
5285 case L2CAP_CONN_REQ:
cb3b3152 5286 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5287 break;
5288
5289 case L2CAP_CONN_RSP:
f5a2598d 5290 case L2CAP_CREATE_CHAN_RSP:
9245e737 5291 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5292 break;
5293
5294 case L2CAP_CONF_REQ:
5295 err = l2cap_config_req(conn, cmd, cmd_len, data);
5296 break;
5297
5298 case L2CAP_CONF_RSP:
9245e737 5299 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5300 break;
5301
5302 case L2CAP_DISCONN_REQ:
cb3b3152 5303 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5304 break;
5305
5306 case L2CAP_DISCONN_RSP:
9245e737 5307 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5308 break;
5309
5310 case L2CAP_ECHO_REQ:
5311 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5312 break;
5313
5314 case L2CAP_ECHO_RSP:
5315 break;
5316
5317 case L2CAP_INFO_REQ:
cb3b3152 5318 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5319 break;
5320
5321 case L2CAP_INFO_RSP:
9245e737 5322 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5323 break;
5324
f94ff6ff
MM		 5325 case L2CAP_CREATE_CHAN_REQ:
5326 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5327 break;
5328
8d5a04a1
MM		 5329 case L2CAP_MOVE_CHAN_REQ:
5330 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5331 break;
5332
5333 case L2CAP_MOVE_CHAN_RSP:
9245e737 5334 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5335 break;
5336
5337 case L2CAP_MOVE_CHAN_CFM:
5338 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5339 break;
5340
5341 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5342 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5343 break;
5344
3300d9a9
CT		 5345 default:
5346 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5347 err = -EINVAL;
5348 break;
5349 }
5350
5351 return err;
5352}
5353
27e2d4c8
JH		 5354static int l2cap_le_connect_req(struct l2cap_conn *conn,
5355 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5356 u8 *data)
5357{
5358 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5359 struct l2cap_le_conn_rsp rsp;
5360 struct l2cap_chan *chan, *pchan;
0cd75f7e 5361 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5362 __le16 psm;
5363 u8 result;
5364
5365 if (cmd_len != sizeof(*req))
5366 return -EPROTO;
5367
5368 scid = __le16_to_cpu(req->scid);
5369 mtu = __le16_to_cpu(req->mtu);
5370 mps = __le16_to_cpu(req->mps);
5371 psm = req->psm;
5372 dcid = 0;
0cd75f7e 5373 credits = 0;
27e2d4c8
JH		 5374
5375 if (mtu < 23 || mps < 23)
5376 return -EPROTO;
5377
5378 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5379 scid, mtu, mps);
5380
5381 /* Check if we have socket listening on psm */
5382 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5383 &conn->hcon->dst, LE_LINK);
5384 if (!pchan) {
5385 result = L2CAP_CR_BAD_PSM;
5386 chan = NULL;
5387 goto response;
5388 }
5389
5390 mutex_lock(&conn->chan_lock);
5391 l2cap_chan_lock(pchan);
5392
5393 if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
5394 result = L2CAP_CR_AUTHENTICATION;
5395 chan = NULL;
5396 goto response_unlock;
5397 }
5398
5399 /* Check if we already have channel with that dcid */
5400 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5401 result = L2CAP_CR_NO_MEM;
5402 chan = NULL;
5403 goto response_unlock;
5404 }
5405
5406 chan = pchan->ops->new_connection(pchan);
5407 if (!chan) {
5408 result = L2CAP_CR_NO_MEM;
5409 goto response_unlock;
5410 }
5411
0ce43ce6
JH		 5412 l2cap_le_flowctl_init(chan);
5413
27e2d4c8
JH		 5414 bacpy(&chan->src, &conn->hcon->src);
5415 bacpy(&chan->dst, &conn->hcon->dst);
5416 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
5417 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
5418 chan->psm = psm;
5419 chan->dcid = scid;
5420 chan->omtu = mtu;
5421 chan->remote_mps = mps;
0cd75f7e 5422 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5423
5424 __l2cap_chan_add(conn, chan);
5425 dcid = chan->scid;
0cd75f7e 5426 credits = chan->rx_credits;
27e2d4c8
JH		 5427
5428 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5429
5430 chan->ident = cmd->ident;
5431
5432 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5433 l2cap_state_change(chan, BT_CONNECT2);
434714dc
JH		 5434 /* The following result value is actually not defined
5435 * for LE CoC but we use it to let the function know
5436 * that it should bail out after doing its cleanup
5437 * instead of sending a response.
5438 */
27e2d4c8
JH		 5439 result = L2CAP_CR_PEND;
5440 chan->ops->defer(chan);
5441 } else {
5442 l2cap_chan_ready(chan);
5443 result = L2CAP_CR_SUCCESS;
5444 }
5445
5446response_unlock:
5447 l2cap_chan_unlock(pchan);
5448 mutex_unlock(&conn->chan_lock);
a24cce14 5449 l2cap_chan_put(pchan);
27e2d4c8
JH		 5450
5451 if (result == L2CAP_CR_PEND)
5452 return 0;
5453
5454response:
5455 if (chan) {
5456 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5457 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5458 } else {
5459 rsp.mtu = 0;
5460 rsp.mps = 0;
5461 }
5462
5463 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5464 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5465 rsp.result = cpu_to_le16(result);
5466
5467 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5468
5469 return 0;
5470}
5471
fad5fc89
JH		 5472static inline int l2cap_le_credits(struct l2cap_conn *conn,
5473 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5474 u8 *data)
5475{
5476 struct l2cap_le_credits *pkt;
5477 struct l2cap_chan *chan;
0f1bfe4e 5478 u16 cid, credits, max_credits;
fad5fc89
JH		 5479
5480 if (cmd_len != sizeof(*pkt))
5481 return -EPROTO;
5482
5483 pkt = (struct l2cap_le_credits *) data;
5484 cid = __le16_to_cpu(pkt->cid);
5485 credits = __le16_to_cpu(pkt->credits);
5486
5487 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5488
5489 chan = l2cap_get_chan_by_dcid(conn, cid);
5490 if (!chan)
5491 return -EBADSLT;
5492
0f1bfe4e
JH		 5493 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5494 if (credits > max_credits) {
5495 BT_ERR("LE credits overflow");
5496 l2cap_send_disconn_req(chan, ECONNRESET);
5497
5498 /* Return 0 so that we don't trigger an unnecessary
5499 * command reject packet.
5500 */
5501 return 0;
5502 }
5503
fad5fc89
JH		 5504 chan->tx_credits += credits;
5505
5506 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5507 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5508 chan->tx_credits--;
5509 }
5510
5511 if (chan->tx_credits)
5512 chan->ops->resume(chan);
5513
5514 l2cap_chan_unlock(chan);
5515
5516 return 0;
5517}
5518
71fb4197
JH		 5519static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5520 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5521 u8 *data)
5522{
5523 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5524 struct l2cap_chan *chan;
5525
5526 if (cmd_len < sizeof(*rej))
5527 return -EPROTO;
5528
5529 mutex_lock(&conn->chan_lock);
5530
5531 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5532 if (!chan)
5533 goto done;
5534
5535 l2cap_chan_lock(chan);
5536 l2cap_chan_del(chan, ECONNREFUSED);
5537 l2cap_chan_unlock(chan);
5538
5539done:
5540 mutex_unlock(&conn->chan_lock);
5541 return 0;
5542}
5543
3300d9a9 5544static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5545 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5546 u8 *data)
3300d9a9 5547{
b5ecba64
JH		 5548 int err = 0;
5549
3300d9a9
CT		 5550 switch (cmd->code) {
5551 case L2CAP_COMMAND_REJ:
71fb4197 5552 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5553 break;
3300d9a9
CT		 5554
5555 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5556 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5557 break;
3300d9a9
CT		 5558
5559 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5560 break;
3300d9a9 5561
f1496dee
JH		 5562 case L2CAP_LE_CONN_RSP:
5563 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5564 break;
f1496dee 5565
27e2d4c8 5566 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5567 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5568 break;
27e2d4c8 5569
fad5fc89
JH		 5570 case L2CAP_LE_CREDITS:
5571 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5572 break;
5573
3defe01a 5574 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5575 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5576 break;
3defe01a
JH		 5577
5578 case L2CAP_DISCONN_RSP:
5579 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5580 break;
3defe01a 5581
3300d9a9
CT		 5582 default:
5583 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5584 err = -EINVAL;
5585 break;
3300d9a9 5586 }
b5ecba64
JH		 5587
5588 return err;
3300d9a9
CT		 5589}
5590
c5623556
JH		 5591static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5592 struct sk_buff *skb)
5593{
69c4e4e8 5594 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5595 struct l2cap_cmd_hdr *cmd;
5596 u16 len;
c5623556
JH		 5597 int err;
5598
69c4e4e8 5599 if (hcon->type != LE_LINK)
3b166295 5600 goto drop;
69c4e4e8 5601
4f3e219d
MH		 5602 if (skb->len < L2CAP_CMD_HDR_SIZE)
5603 goto drop;
c5623556 5604
4f3e219d
MH		 5605 cmd = (void *) skb->data;
5606 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5607
4f3e219d 5608 len = le16_to_cpu(cmd->len);
c5623556 5609
4f3e219d 5610 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5611
4f3e219d
MH		 5612 if (len != skb->len || !cmd->ident) {
5613 BT_DBG("corrupted command");
5614 goto drop;
5615 }
c5623556 5616
203e639e 5617 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5618 if (err) {
5619 struct l2cap_cmd_rej_unk rej;
c5623556 5620
4f3e219d 5621 BT_ERR("Wrong link type (%d)", err);
c5623556 5622
dcf4adbf 5623 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5624 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5625 sizeof(rej), &rej);
c5623556
JH		 5626 }
5627
3b166295 5628drop:
c5623556
JH		 5629 kfree_skb(skb);
5630}
5631
3300d9a9 5632static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5633 struct sk_buff *skb)
1da177e4 5634{
69c4e4e8 5635 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5636 u8 *data = skb->data;
5637 int len = skb->len;
5638 struct l2cap_cmd_hdr cmd;
3300d9a9 5639 int err;
1da177e4
LT		 5640
5641 l2cap_raw_recv(conn, skb);
5642
69c4e4e8 5643 if (hcon->type != ACL_LINK)
3b166295 5644 goto drop;
69c4e4e8 5645
1da177e4 5646 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5647 u16 cmd_len;
1da177e4
LT		 5648 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5649 data += L2CAP_CMD_HDR_SIZE;
5650 len -= L2CAP_CMD_HDR_SIZE;
5651
88219a0f 5652 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5653
2d792818
GP		 5654 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5655 cmd.ident);
1da177e4 5656
88219a0f 5657 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5658 BT_DBG("corrupted command");
5659 break;
5660 }
5661
c5623556 5662 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5663 if (err) {
e2fd318e 5664 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5665
5666 BT_ERR("Wrong link type (%d)", err);
1da177e4 5667
dcf4adbf 5668 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5669 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5670 sizeof(rej), &rej);
1da177e4
LT		 5671 }
5672
88219a0f
AV		 5673 data += cmd_len;
5674 len -= cmd_len;
1da177e4
LT		 5675 }
5676
3b166295 5677drop:
1da177e4
LT		 5678 kfree_skb(skb);
5679}
5680
47d1ec61 5681static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5682{
5683 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5684 int hdr_size;
5685
5686 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5687 hdr_size = L2CAP_EXT_HDR_SIZE;
5688 else
5689 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5690
47d1ec61 5691 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5692 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5693 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5694 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5695
5696 if (our_fcs != rcv_fcs)
7a560e5c 5697 return -EBADMSG;
fcc203c3
GP		 5698 }
5699 return 0;
5700}
5701
6ea00485 5702static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5703{
e31f7633 5704 struct l2cap_ctrl control;
d5392c8f 5705
e31f7633 5706 BT_DBG("chan %p", chan);
d5392c8f 5707
e31f7633
MM		 5708 memset(&control, 0, sizeof(control));
5709 control.sframe = 1;
5710 control.final = 1;
5711 control.reqseq = chan->buffer_seq;
5712 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5713
e2ab4353 5714 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5715 control.super = L2CAP_SUPER_RNR;
5716 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5717 }
5718
e31f7633
MM		 5719 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5720 chan->unacked_frames > 0)
5721 __set_retrans_timer(chan);
d5392c8f 5722
e31f7633 5723 /* Send pending iframes */
525cd185 5724 l2cap_ertm_send(chan);
d5392c8f 5725
e2ab4353 5726 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5727 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5728 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5729 * send it now.
5730 */
5731 control.super = L2CAP_SUPER_RR;
5732 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5733 }
5734}
5735
2d792818
GP		 5736static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5737 struct sk_buff **last_frag)
18778a63 5738{
84084a31
MM		 5739 /* skb->len reflects data in skb as well as all fragments
5740 * skb->data_len reflects only data in fragments
5741 */
5742 if (!skb_has_frag_list(skb))
5743 skb_shinfo(skb)->frag_list = new_frag;
5744
5745 new_frag->next = NULL;
5746
5747 (*last_frag)->next = new_frag;
5748 *last_frag = new_frag;
5749
5750 skb->len += new_frag->len;
5751 skb->data_len += new_frag->len;
5752 skb->truesize += new_frag->truesize;
5753}
5754
4b51dae9
MM		 5755static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5756 struct l2cap_ctrl *control)
84084a31
MM		 5757{
5758 int err = -EINVAL;
18778a63 5759
4b51dae9 5760 switch (control->sar) {
7e0ef6ee 5761 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5762 if (chan->sdu)
5763 break;
18778a63 5764
80b98027 5765 err = chan->ops->recv(chan, skb);
84084a31 5766 break;
18778a63 5767
7e0ef6ee 5768 case L2CAP_SAR_START:
84084a31
MM		 5769 if (chan->sdu)
5770 break;
18778a63 5771
6f61fd47 5772 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5773 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5774
84084a31
MM		 5775 if (chan->sdu_len > chan->imtu) {
5776 err = -EMSGSIZE;
5777 break;
5778 }
1890d36b 5779
84084a31
MM		 5780 if (skb->len >= chan->sdu_len)
5781 break;
18778a63 5782
84084a31
MM		 5783 chan->sdu = skb;
5784 chan->sdu_last_frag = skb;
18778a63 5785
84084a31
MM		 5786 skb = NULL;
5787 err = 0;
18778a63
GP		 5788 break;
5789
7e0ef6ee 5790 case L2CAP_SAR_CONTINUE:
6f61fd47 5791 if (!chan->sdu)
84084a31 5792 break;
18778a63 5793
84084a31
MM		 5794 append_skb_frag(chan->sdu, skb,
5795 &chan->sdu_last_frag);
5796 skb = NULL;
18778a63 5797
84084a31
MM		 5798 if (chan->sdu->len >= chan->sdu_len)
5799 break;
4178ba46 5800
84084a31 5801 err = 0;
18778a63
GP		 5802 break;
5803
7e0ef6ee 5804 case L2CAP_SAR_END:
6f61fd47 5805 if (!chan->sdu)
84084a31 5806 break;
18778a63 5807
84084a31
MM		 5808 append_skb_frag(chan->sdu, skb,
5809 &chan->sdu_last_frag);
5810 skb = NULL;
4178ba46 5811
84084a31
MM		 5812 if (chan->sdu->len != chan->sdu_len)
5813 break;
18778a63 5814
80b98027 5815 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5816
84084a31
MM		 5817 if (!err) {
5818 /* Reassembly complete */
5819 chan->sdu = NULL;
5820 chan->sdu_last_frag = NULL;
5821 chan->sdu_len = 0;
1890d36b 5822 }
18778a63
GP		 5823 break;
5824 }
5825
84084a31
MM		 5826 if (err) {
5827 kfree_skb(skb);
5828 kfree_skb(chan->sdu);
5829 chan->sdu = NULL;
5830 chan->sdu_last_frag = NULL;
5831 chan->sdu_len = 0;
5832 }
18778a63 5833
84084a31 5834 return err;
18778a63
GP		 5835}
5836
32b32735
MM		 5837static int l2cap_resegment(struct l2cap_chan *chan)
5838{
5839 /* Placeholder */
5840 return 0;
5841}
5842
61aa4f5b 5843void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5844{
61aa4f5b 5845 u8 event;
712132eb 5846
61aa4f5b
MM		 5847 if (chan->mode != L2CAP_MODE_ERTM)
5848 return;
712132eb 5849
61aa4f5b 5850 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5851 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5852}
5853
d2a7ac5d
MM		 5854static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5855{
63838725
MM		 5856 int err = 0;
5857 /* Pass sequential frames to l2cap_reassemble_sdu()
5858 * until a gap is encountered.
5859 */
5860
5861 BT_DBG("chan %p", chan);
5862
5863 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5864 struct sk_buff *skb;
5865 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5866 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5867
5868 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5869
5870 if (!skb)
5871 break;
5872
5873 skb_unlink(skb, &chan->srej_q);
5874 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5875 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5876 if (err)
5877 break;
5878 }
5879
5880 if (skb_queue_empty(&chan->srej_q)) {
5881 chan->rx_state = L2CAP_RX_STATE_RECV;
5882 l2cap_send_ack(chan);
5883 }
5884
5885 return err;
d2a7ac5d
MM		 5886}
5887
5888static void l2cap_handle_srej(struct l2cap_chan *chan,
5889 struct l2cap_ctrl *control)
5890{
f80842a8
MM		 5891 struct sk_buff *skb;
5892
5893 BT_DBG("chan %p, control %p", chan, control);
5894
5895 if (control->reqseq == chan->next_tx_seq) {
5896 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5897 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5898 return;
5899 }
5900
5901 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5902
5903 if (skb == NULL) {
5904 BT_DBG("Seq %d not available for retransmission",
5905 control->reqseq);
5906 return;
5907 }
5908
5909 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5910 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5911 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5912 return;
5913 }
5914
5915 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5916
5917 if (control->poll) {
5918 l2cap_pass_to_tx(chan, control);
5919
5920 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5921 l2cap_retransmit(chan, control);
5922 l2cap_ertm_send(chan);
5923
5924 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5925 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5926 chan->srej_save_reqseq = control->reqseq;
5927 }
5928 } else {
5929 l2cap_pass_to_tx_fbit(chan, control);
5930
5931 if (control->final) {
5932 if (chan->srej_save_reqseq != control->reqseq ||
5933 !test_and_clear_bit(CONN_SREJ_ACT,
5934 &chan->conn_state))
5935 l2cap_retransmit(chan, control);
5936 } else {
5937 l2cap_retransmit(chan, control);
5938 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5939 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5940 chan->srej_save_reqseq = control->reqseq;
5941 }
5942 }
5943 }
d2a7ac5d
MM		 5944}
5945
5946static void l2cap_handle_rej(struct l2cap_chan *chan,
5947 struct l2cap_ctrl *control)
5948{
fcd289df
MM		 5949 struct sk_buff *skb;
5950
5951 BT_DBG("chan %p, control %p", chan, control);
5952
5953 if (control->reqseq == chan->next_tx_seq) {
5954 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5955 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5956 return;
5957 }
5958
5959 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5960
5961 if (chan->max_tx && skb &&
5962 bt_cb(skb)->control.retries >= chan->max_tx) {
5963 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5964 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5965 return;
5966 }
5967
5968 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5969
5970 l2cap_pass_to_tx(chan, control);
5971
5972 if (control->final) {
5973 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5974 l2cap_retransmit_all(chan, control);
5975 } else {
5976 l2cap_retransmit_all(chan, control);
5977 l2cap_ertm_send(chan);
5978 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5979 set_bit(CONN_REJ_ACT, &chan->conn_state);
5980 }
d2a7ac5d
MM		 5981}
5982
4b51dae9
MM		 5983static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5984{
5985 BT_DBG("chan %p, txseq %d", chan, txseq);
5986
5987 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5988 chan->expected_tx_seq);
5989
5990 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5991 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5992 chan->tx_win) {
4b51dae9
MM		 5993 /* See notes below regarding "double poll" and
5994 * invalid packets.
5995 */
5996 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5997 BT_DBG("Invalid/Ignore - after SREJ");
5998 return L2CAP_TXSEQ_INVALID_IGNORE;
5999 } else {
6000 BT_DBG("Invalid - in window after SREJ sent");
6001 return L2CAP_TXSEQ_INVALID;
6002 }
6003 }
6004
6005 if (chan->srej_list.head == txseq) {
6006 BT_DBG("Expected SREJ");
6007 return L2CAP_TXSEQ_EXPECTED_SREJ;
6008 }
6009
6010 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6011 BT_DBG("Duplicate SREJ - txseq already stored");
6012 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6013 }
6014
6015 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6016 BT_DBG("Unexpected SREJ - not requested");
6017 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6018 }
6019 }
6020
6021 if (chan->expected_tx_seq == txseq) {
6022 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6023 chan->tx_win) {
6024 BT_DBG("Invalid - txseq outside tx window");
6025 return L2CAP_TXSEQ_INVALID;
6026 } else {
6027 BT_DBG("Expected");
6028 return L2CAP_TXSEQ_EXPECTED;
6029 }
6030 }
6031
6032 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6033 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6034 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6035 return L2CAP_TXSEQ_DUPLICATE;
6036 }
6037
6038 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6039 /* A source of invalid packets is a "double poll" condition,
6040 * where delays cause us to send multiple poll packets. If
6041 * the remote stack receives and processes both polls,
6042 * sequence numbers can wrap around in such a way that a
6043 * resent frame has a sequence number that looks like new data
6044 * with a sequence gap. This would trigger an erroneous SREJ
6045 * request.
6046 *
6047 * Fortunately, this is impossible with a tx window that's
6048 * less than half of the maximum sequence number, which allows
6049 * invalid frames to be safely ignored.
6050 *
6051 * With tx window sizes greater than half of the tx window
6052 * maximum, the frame is invalid and cannot be ignored. This
6053 * causes a disconnect.
6054 */
6055
6056 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6057 BT_DBG("Invalid/Ignore - txseq outside tx window");
6058 return L2CAP_TXSEQ_INVALID_IGNORE;
6059 } else {
6060 BT_DBG("Invalid - txseq outside tx window");
6061 return L2CAP_TXSEQ_INVALID;
6062 }
6063 } else {
6064 BT_DBG("Unexpected - txseq indicates missing frames");
6065 return L2CAP_TXSEQ_UNEXPECTED;
6066 }
6067}
6068
d2a7ac5d
MM		 6069static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6070 struct l2cap_ctrl *control,
6071 struct sk_buff *skb, u8 event)
6072{
6073 int err = 0;
941247f9 6074 bool skb_in_use = false;
d2a7ac5d
MM		 6075
6076 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6077 event);
6078
6079 switch (event) {
6080 case L2CAP_EV_RECV_IFRAME:
6081 switch (l2cap_classify_txseq(chan, control->txseq)) {
6082 case L2CAP_TXSEQ_EXPECTED:
6083 l2cap_pass_to_tx(chan, control);
6084
6085 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6086 BT_DBG("Busy, discarding expected seq %d",
6087 control->txseq);
6088 break;
6089 }
6090
6091 chan->expected_tx_seq = __next_seq(chan,
6092 control->txseq);
6093
6094 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6095 skb_in_use = true;
d2a7ac5d
MM		 6096
6097 err = l2cap_reassemble_sdu(chan, skb, control);
6098 if (err)
6099 break;
6100
6101 if (control->final) {
6102 if (!test_and_clear_bit(CONN_REJ_ACT,
6103 &chan->conn_state)) {
6104 control->final = 0;
6105 l2cap_retransmit_all(chan, control);
6106 l2cap_ertm_send(chan);
6107 }
6108 }
6109
6110 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6111 l2cap_send_ack(chan);
6112 break;
6113 case L2CAP_TXSEQ_UNEXPECTED:
6114 l2cap_pass_to_tx(chan, control);
6115
6116 /* Can't issue SREJ frames in the local busy state.
6117 * Drop this frame, it will be seen as missing
6118 * when local busy is exited.
6119 */
6120 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6121 BT_DBG("Busy, discarding unexpected seq %d",
6122 control->txseq);
6123 break;
6124 }
6125
6126 /* There was a gap in the sequence, so an SREJ
6127 * must be sent for each missing frame. The
6128 * current frame is stored for later use.
6129 */
6130 skb_queue_tail(&chan->srej_q, skb);
941247f9 6131 skb_in_use = true;
d2a7ac5d
MM		 6132 BT_DBG("Queued %p (queue len %d)", skb,
6133 skb_queue_len(&chan->srej_q));
6134
6135 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6136 l2cap_seq_list_clear(&chan->srej_list);
6137 l2cap_send_srej(chan, control->txseq);
6138
6139 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6140 break;
6141 case L2CAP_TXSEQ_DUPLICATE:
6142 l2cap_pass_to_tx(chan, control);
6143 break;
6144 case L2CAP_TXSEQ_INVALID_IGNORE:
6145 break;
6146 case L2CAP_TXSEQ_INVALID:
6147 default:
5e4e3972 6148 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6149 break;
6150 }
6151 break;
6152 case L2CAP_EV_RECV_RR:
6153 l2cap_pass_to_tx(chan, control);
6154 if (control->final) {
6155 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6156
e6a3ee6e
MM		 6157 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6158 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6159 control->final = 0;
6160 l2cap_retransmit_all(chan, control);
6161 }
6162
6163 l2cap_ertm_send(chan);
6164 } else if (control->poll) {
6165 l2cap_send_i_or_rr_or_rnr(chan);
6166 } else {
6167 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6168 &chan->conn_state) &&
6169 chan->unacked_frames)
6170 __set_retrans_timer(chan);
6171
6172 l2cap_ertm_send(chan);
6173 }
6174 break;
6175 case L2CAP_EV_RECV_RNR:
6176 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6177 l2cap_pass_to_tx(chan, control);
6178 if (control && control->poll) {
6179 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6180 l2cap_send_rr_or_rnr(chan, 0);
6181 }
6182 __clear_retrans_timer(chan);
6183 l2cap_seq_list_clear(&chan->retrans_list);
6184 break;
6185 case L2CAP_EV_RECV_REJ:
6186 l2cap_handle_rej(chan, control);
6187 break;
6188 case L2CAP_EV_RECV_SREJ:
6189 l2cap_handle_srej(chan, control);
6190 break;
6191 default:
6192 break;
6193 }
6194
6195 if (skb && !skb_in_use) {
6196 BT_DBG("Freeing %p", skb);
6197 kfree_skb(skb);
6198 }
6199
6200 return err;
6201}
6202
6203static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6204 struct l2cap_ctrl *control,
6205 struct sk_buff *skb, u8 event)
6206{
6207 int err = 0;
6208 u16 txseq = control->txseq;
941247f9 6209 bool skb_in_use = false;
d2a7ac5d
MM		 6210
6211 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6212 event);
6213
6214 switch (event) {
6215 case L2CAP_EV_RECV_IFRAME:
6216 switch (l2cap_classify_txseq(chan, txseq)) {
6217 case L2CAP_TXSEQ_EXPECTED:
6218 /* Keep frame for reassembly later */
6219 l2cap_pass_to_tx(chan, control);
6220 skb_queue_tail(&chan->srej_q, skb);
941247f9 6221 skb_in_use = true;
d2a7ac5d
MM		 6222 BT_DBG("Queued %p (queue len %d)", skb,
6223 skb_queue_len(&chan->srej_q));
6224
6225 chan->expected_tx_seq = __next_seq(chan, txseq);
6226 break;
6227 case L2CAP_TXSEQ_EXPECTED_SREJ:
6228 l2cap_seq_list_pop(&chan->srej_list);
6229
6230 l2cap_pass_to_tx(chan, control);
6231 skb_queue_tail(&chan->srej_q, skb);
941247f9 6232 skb_in_use = true;
d2a7ac5d
MM		 6233 BT_DBG("Queued %p (queue len %d)", skb,
6234 skb_queue_len(&chan->srej_q));
6235
6236 err = l2cap_rx_queued_iframes(chan);
6237 if (err)
6238 break;
6239
6240 break;
6241 case L2CAP_TXSEQ_UNEXPECTED:
6242 /* Got a frame that can't be reassembled yet.
6243 * Save it for later, and send SREJs to cover
6244 * the missing frames.
6245 */
6246 skb_queue_tail(&chan->srej_q, skb);
941247f9 6247 skb_in_use = true;
d2a7ac5d
MM		 6248 BT_DBG("Queued %p (queue len %d)", skb,
6249 skb_queue_len(&chan->srej_q));
6250
6251 l2cap_pass_to_tx(chan, control);
6252 l2cap_send_srej(chan, control->txseq);
6253 break;
6254 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6255 /* This frame was requested with an SREJ, but
6256 * some expected retransmitted frames are
6257 * missing. Request retransmission of missing
6258 * SREJ'd frames.
6259 */
6260 skb_queue_tail(&chan->srej_q, skb);
941247f9 6261 skb_in_use = true;
d2a7ac5d
MM		 6262 BT_DBG("Queued %p (queue len %d)", skb,
6263 skb_queue_len(&chan->srej_q));
6264
6265 l2cap_pass_to_tx(chan, control);
6266 l2cap_send_srej_list(chan, control->txseq);
6267 break;
6268 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6269 /* We've already queued this frame. Drop this copy. */
6270 l2cap_pass_to_tx(chan, control);
6271 break;
6272 case L2CAP_TXSEQ_DUPLICATE:
6273 /* Expecting a later sequence number, so this frame
6274 * was already received. Ignore it completely.
6275 */
6276 break;
6277 case L2CAP_TXSEQ_INVALID_IGNORE:
6278 break;
6279 case L2CAP_TXSEQ_INVALID:
6280 default:
5e4e3972 6281 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6282 break;
6283 }
6284 break;
6285 case L2CAP_EV_RECV_RR:
6286 l2cap_pass_to_tx(chan, control);
6287 if (control->final) {
6288 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6289
6290 if (!test_and_clear_bit(CONN_REJ_ACT,
6291 &chan->conn_state)) {
6292 control->final = 0;
6293 l2cap_retransmit_all(chan, control);
6294 }
6295
6296 l2cap_ertm_send(chan);
6297 } else if (control->poll) {
6298 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6299 &chan->conn_state) &&
6300 chan->unacked_frames) {
6301 __set_retrans_timer(chan);
6302 }
6303
6304 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6305 l2cap_send_srej_tail(chan);
6306 } else {
6307 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6308 &chan->conn_state) &&
6309 chan->unacked_frames)
6310 __set_retrans_timer(chan);
6311
6312 l2cap_send_ack(chan);
6313 }
6314 break;
6315 case L2CAP_EV_RECV_RNR:
6316 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6317 l2cap_pass_to_tx(chan, control);
6318 if (control->poll) {
6319 l2cap_send_srej_tail(chan);
6320 } else {
6321 struct l2cap_ctrl rr_control;
6322 memset(&rr_control, 0, sizeof(rr_control));
6323 rr_control.sframe = 1;
6324 rr_control.super = L2CAP_SUPER_RR;
6325 rr_control.reqseq = chan->buffer_seq;
6326 l2cap_send_sframe(chan, &rr_control);
6327 }
6328
6329 break;
6330 case L2CAP_EV_RECV_REJ:
6331 l2cap_handle_rej(chan, control);
6332 break;
6333 case L2CAP_EV_RECV_SREJ:
6334 l2cap_handle_srej(chan, control);
6335 break;
6336 }
6337
6338 if (skb && !skb_in_use) {
6339 BT_DBG("Freeing %p", skb);
6340 kfree_skb(skb);
6341 }
6342
6343 return err;
6344}
6345
32b32735
MM		 6346static int l2cap_finish_move(struct l2cap_chan *chan)
6347{
6348 BT_DBG("chan %p", chan);
6349
6350 chan->rx_state = L2CAP_RX_STATE_RECV;
6351
6352 if (chan->hs_hcon)
6353 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6354 else
6355 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6356
6357 return l2cap_resegment(chan);
6358}
6359
6360static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6361 struct l2cap_ctrl *control,
6362 struct sk_buff *skb, u8 event)
6363{
6364 int err;
6365
6366 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6367 event);
6368
6369 if (!control->poll)
6370 return -EPROTO;
6371
6372 l2cap_process_reqseq(chan, control->reqseq);
6373
6374 if (!skb_queue_empty(&chan->tx_q))
6375 chan->tx_send_head = skb_peek(&chan->tx_q);
6376 else
6377 chan->tx_send_head = NULL;
6378
6379 /* Rewind next_tx_seq to the point expected
6380 * by the receiver.
6381 */
6382 chan->next_tx_seq = control->reqseq;
6383 chan->unacked_frames = 0;
6384
6385 err = l2cap_finish_move(chan);
6386 if (err)
6387 return err;
6388
6389 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6390 l2cap_send_i_or_rr_or_rnr(chan);
6391
6392 if (event == L2CAP_EV_RECV_IFRAME)
6393 return -EPROTO;
6394
6395 return l2cap_rx_state_recv(chan, control, NULL, event);
6396}
6397
6398static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6399 struct l2cap_ctrl *control,
6400 struct sk_buff *skb, u8 event)
6401{
6402 int err;
6403
6404 if (!control->final)
6405 return -EPROTO;
6406
6407 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6408
6409 chan->rx_state = L2CAP_RX_STATE_RECV;
6410 l2cap_process_reqseq(chan, control->reqseq);
6411
6412 if (!skb_queue_empty(&chan->tx_q))
6413 chan->tx_send_head = skb_peek(&chan->tx_q);
6414 else
6415 chan->tx_send_head = NULL;
6416
6417 /* Rewind next_tx_seq to the point expected
6418 * by the receiver.
6419 */
6420 chan->next_tx_seq = control->reqseq;
6421 chan->unacked_frames = 0;
6422
6423 if (chan->hs_hcon)
6424 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6425 else
6426 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6427
6428 err = l2cap_resegment(chan);
6429
6430 if (!err)
6431 err = l2cap_rx_state_recv(chan, control, skb, event);
6432
6433 return err;
6434}
6435
d2a7ac5d
MM		 6436static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6437{
6438 /* Make sure reqseq is for a packet that has been sent but not acked */
6439 u16 unacked;
6440
6441 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6442 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6443}
6444
cec8ab6e
MM		 6445static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6446 struct sk_buff *skb, u8 event)
218bb9df 6447{
d2a7ac5d
MM		 6448 int err = 0;
6449
6450 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6451 control, skb, event, chan->rx_state);
6452
6453 if (__valid_reqseq(chan, control->reqseq)) {
6454 switch (chan->rx_state) {
6455 case L2CAP_RX_STATE_RECV:
6456 err = l2cap_rx_state_recv(chan, control, skb, event);
6457 break;
6458 case L2CAP_RX_STATE_SREJ_SENT:
6459 err = l2cap_rx_state_srej_sent(chan, control, skb,
6460 event);
6461 break;
32b32735
MM		 6462 case L2CAP_RX_STATE_WAIT_P:
6463 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6464 break;
6465 case L2CAP_RX_STATE_WAIT_F:
6466 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6467 break;
d2a7ac5d
MM		 6468 default:
6469 /* shut it down */
6470 break;
6471 }
6472 } else {
6473 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6474 control->reqseq, chan->next_tx_seq,
6475 chan->expected_ack_seq);
5e4e3972 6476 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6477 }
6478
6479 return err;
cec8ab6e
MM		 6480}
6481
6482static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6483 struct sk_buff *skb)
6484{
4b51dae9
MM		 6485 int err = 0;
6486
6487 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6488 chan->rx_state);
6489
6490 if (l2cap_classify_txseq(chan, control->txseq) ==
6491 L2CAP_TXSEQ_EXPECTED) {
6492 l2cap_pass_to_tx(chan, control);
6493
6494 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6495 __next_seq(chan, chan->buffer_seq));
6496
6497 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6498
6499 l2cap_reassemble_sdu(chan, skb, control);
6500 } else {
6501 if (chan->sdu) {
6502 kfree_skb(chan->sdu);
6503 chan->sdu = NULL;
6504 }
6505 chan->sdu_last_frag = NULL;
6506 chan->sdu_len = 0;
6507
6508 if (skb) {
6509 BT_DBG("Freeing %p", skb);
6510 kfree_skb(skb);
6511 }
6512 }
6513
6514 chan->last_acked_seq = control->txseq;
6515 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6516
6517 return err;
cec8ab6e
MM		 6518}
6519
6520static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6521{
6522 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6523 u16 len;
6524 u8 event;
218bb9df 6525
b76bbd66
MM		 6526 __unpack_control(chan, skb);
6527
218bb9df
GP		 6528 len = skb->len;
6529
6530 /*
6531 * We can just drop the corrupted I-frame here.
6532 * Receiver will miss it and start proper recovery
cec8ab6e 6533 * procedures and ask for retransmission.
218bb9df 6534 */
47d1ec61 6535 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6536 goto drop;
6537
cec8ab6e 6538 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6539 len -= L2CAP_SDULEN_SIZE;
218bb9df 6540
47d1ec61 6541 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6542 len -= L2CAP_FCS_SIZE;
218bb9df 6543
47d1ec61 6544 if (len > chan->mps) {
5e4e3972 6545 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6546 goto drop;
6547 }
6548
cec8ab6e
MM		 6549 if (!control->sframe) {
6550 int err;
218bb9df 6551
cec8ab6e
MM		 6552 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6553 control->sar, control->reqseq, control->final,
6554 control->txseq);
218bb9df 6555
cec8ab6e
MM		 6556 /* Validate F-bit - F=0 always valid, F=1 only
6557 * valid in TX WAIT_F
6558 */
6559 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6560 goto drop;
cec8ab6e
MM		 6561
6562 if (chan->mode != L2CAP_MODE_STREAMING) {
6563 event = L2CAP_EV_RECV_IFRAME;
6564 err = l2cap_rx(chan, control, skb, event);
6565 } else {
6566 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6567 }
6568
cec8ab6e 6569 if (err)
5e4e3972 6570 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6571 } else {
cec8ab6e
MM		 6572 const u8 rx_func_to_event[4] = {
6573 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6574 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6575 };
6576
6577 /* Only I-frames are expected in streaming mode */
6578 if (chan->mode == L2CAP_MODE_STREAMING)
6579 goto drop;
6580
6581 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6582 control->reqseq, control->final, control->poll,
6583 control->super);
6584
218bb9df 6585 if (len != 0) {
1bb166e6 6586 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6587 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6588 goto drop;
6589 }
6590
cec8ab6e
MM		 6591 /* Validate F and P bits */
6592 if (control->final && (control->poll ||
6593 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6594 goto drop;
6595
6596 event = rx_func_to_event[control->super];
6597 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6598 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6599 }
6600
6601 return 0;
6602
6603drop:
6604 kfree_skb(skb);
6605 return 0;
6606}
6607
b1c325c2
JH		 6608static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6609{
6610 struct l2cap_conn *conn = chan->conn;
6611 struct l2cap_le_credits pkt;
6612 u16 return_credits;
6613
6614 /* We return more credits to the sender only after the amount of
6615 * credits falls below half of the initial amount.
6616 */
f15b8ecf 6617 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6618 return;
6619
f15b8ecf 6620 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6621
6622 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6623
6624 chan->rx_credits += return_credits;
6625
6626 pkt.cid = cpu_to_le16(chan->scid);
6627 pkt.credits = cpu_to_le16(return_credits);
6628
6629 chan->ident = l2cap_get_ident(conn);
6630
6631 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6632}
6633
fad5fc89
JH		 6634static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6635{
aac23bf6
JH		 6636 int err;
6637
6638 if (!chan->rx_credits) {
6639 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6640 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6641 return -ENOBUFS;
aac23bf6 6642 }
fad5fc89 6643
aac23bf6
JH		 6644 if (chan->imtu < skb->len) {
6645 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6646 return -ENOBUFS;
aac23bf6 6647 }
fad5fc89
JH		 6648
6649 chan->rx_credits--;
6650 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6651
6652 l2cap_chan_le_send_credits(chan);
6653
aac23bf6
JH		 6654 err = 0;
6655
6656 if (!chan->sdu) {
6657 u16 sdu_len;
6658
6659 sdu_len = get_unaligned_le16(skb->data);
6660 skb_pull(skb, L2CAP_SDULEN_SIZE);
6661
6662 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6663 sdu_len, skb->len, chan->imtu);
6664
6665 if (sdu_len > chan->imtu) {
6666 BT_ERR("Too big LE L2CAP SDU length received");
6667 err = -EMSGSIZE;
6668 goto failed;
6669 }
6670
6671 if (skb->len > sdu_len) {
6672 BT_ERR("Too much LE L2CAP data received");
6673 err = -EINVAL;
6674 goto failed;
6675 }
6676
6677 if (skb->len == sdu_len)
6678 return chan->ops->recv(chan, skb);
6679
6680 chan->sdu = skb;
6681 chan->sdu_len = sdu_len;
6682 chan->sdu_last_frag = skb;
6683
6684 return 0;
6685 }
6686
6687 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6688 chan->sdu->len, skb->len, chan->sdu_len);
6689
6690 if (chan->sdu->len + skb->len > chan->sdu_len) {
6691 BT_ERR("Too much LE L2CAP data received");
6692 err = -EINVAL;
6693 goto failed;
6694 }
6695
6696 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6697 skb = NULL;
6698
6699 if (chan->sdu->len == chan->sdu_len) {
6700 err = chan->ops->recv(chan, chan->sdu);
6701 if (!err) {
6702 chan->sdu = NULL;
6703 chan->sdu_last_frag = NULL;
6704 chan->sdu_len = 0;
6705 }
6706 }
6707
6708failed:
6709 if (err) {
6710 kfree_skb(skb);
6711 kfree_skb(chan->sdu);
6712 chan->sdu = NULL;
6713 chan->sdu_last_frag = NULL;
6714 chan->sdu_len = 0;
6715 }
6716
6717 /* We can't return an error here since we took care of the skb
6718 * freeing internally. An error return would cause the caller to
6719 * do a double-free of the skb.
6720 */
6721 return 0;
fad5fc89
JH		 6722}
6723
13ca56e0
AE		 6724static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6725 struct sk_buff *skb)
1da177e4 6726{
48454079 6727 struct l2cap_chan *chan;
1da177e4 6728
baa7e1fa 6729 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6730 if (!chan) {
97e8e89d
AE		 6731 if (cid == L2CAP_CID_A2MP) {
6732 chan = a2mp_channel_create(conn, skb);
6733 if (!chan) {
6734 kfree_skb(skb);
13ca56e0 6735 return;
97e8e89d
AE		 6736 }
6737
6738 l2cap_chan_lock(chan);
6739 } else {
6740 BT_DBG("unknown cid 0x%4.4x", cid);
6741 /* Drop packet and return */
6742 kfree_skb(skb);
13ca56e0 6743 return;
97e8e89d 6744 }
1da177e4
LT		 6745 }
6746
49208c9c 6747 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6748
89bc500e 6749 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6750 goto drop;
6751
0c1bc5c6 6752 switch (chan->mode) {
38319713 6753 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6754 if (l2cap_le_data_rcv(chan, skb) < 0)
6755 goto drop;
6756
6757 goto done;
6758
1c2acffb
GP		 6759 case L2CAP_MODE_BASIC:
6760 /* If socket recv buffers overflows we drop data here
6761 * which is *bad* because L2CAP has to be reliable.
6762 * But we don't have any other choice. L2CAP doesn't
6763 * provide flow control mechanism. */
1da177e4 6764
2c96e03d
SJ		 6765 if (chan->imtu < skb->len) {
6766 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6767 goto drop;
2c96e03d 6768 }
1da177e4 6769
80b98027 6770 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6771 goto done;
6772 break;
6773
6774 case L2CAP_MODE_ERTM:
6840ed07 6775 case L2CAP_MODE_STREAMING:
cec8ab6e 6776 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6777 goto done;
6778
1c2acffb 6779 default:
0c1bc5c6 6780 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6781 break;
6782 }
1da177e4
LT		 6783
6784drop:
6785 kfree_skb(skb);
6786
6787done:
6be36555 6788 l2cap_chan_unlock(chan);
1da177e4
LT		 6789}
6790
84104b24
AE		 6791static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6792 struct sk_buff *skb)
1da177e4 6793{
ae4fd2d3 6794 struct hci_conn *hcon = conn->hcon;
23691d75 6795 struct l2cap_chan *chan;
1da177e4 6796
ae4fd2d3 6797 if (hcon->type != ACL_LINK)
a24cce14 6798 goto free_skb;
ae4fd2d3 6799
bf20fd4e
JH		 6800 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6801 ACL_LINK);
23691d75 6802 if (!chan)
a24cce14 6803 goto free_skb;
1da177e4 6804
5b4cedaa 6805 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6806
89bc500e 6807 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6808 goto drop;
6809
e13e21dc 6810 if (chan->imtu < skb->len)
1da177e4
LT		 6811 goto drop;
6812
2edf870d 6813 /* Store remote BD_ADDR and PSM for msg_name */
06ae3314 6814 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
2edf870d
MH		 6815 bt_cb(skb)->psm = psm;
6816
a24cce14
JH		 6817 if (!chan->ops->recv(chan, skb)) {
6818 l2cap_chan_put(chan);
84104b24 6819 return;
a24cce14 6820 }
1da177e4
LT		 6821
6822drop:
a24cce14
JH		 6823 l2cap_chan_put(chan);
6824free_skb:
1da177e4 6825 kfree_skb(skb);
1da177e4
LT		 6826}
6827
6828static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6829{
6830 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6831 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6832 u16 cid, len;
6833 __le16 psm;
1da177e4 6834
61a939c6
JH		 6835 if (hcon->state != BT_CONNECTED) {
6836 BT_DBG("queueing pending rx skb");
6837 skb_queue_tail(&conn->pending_rx, skb);
6838 return;
6839 }
6840
1da177e4
LT		 6841 skb_pull(skb, L2CAP_HDR_SIZE);
6842 cid = __le16_to_cpu(lh->cid);
6843 len = __le16_to_cpu(lh->len);
6844
1c2acffb
GP		 6845 if (len != skb->len) {
6846 kfree_skb(skb);
6847 return;
6848 }
6849
9e1d7e15
JH		 6850 /* Since we can't actively block incoming LE connections we must
6851 * at least ensure that we ignore incoming data from them.
6852 */
6853 if (hcon->type == LE_LINK &&
dcc36c16
JH		 6854 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
6855 bdaddr_type(hcon, hcon->dst_type))) {
e493150e
JH		 6856 kfree_skb(skb);
6857 return;
6858 }
6859
1da177e4
LT		 6860 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6861
6862 switch (cid) {
8db4dc46 6863 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6864 l2cap_sig_channel(conn, skb);
6865 break;
6866
8db4dc46 6867 case L2CAP_CID_CONN_LESS:
097db76c 6868 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6869 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6870 l2cap_conless_channel(conn, psm, skb);
6871 break;
6872
a2877629
MH		 6873 case L2CAP_CID_LE_SIGNALING:
6874 l2cap_le_sig_channel(conn, skb);
6875 break;
6876
1da177e4
LT		 6877 default:
6878 l2cap_data_channel(conn, cid, skb);
6879 break;
6880 }
6881}
6882
61a939c6
JH		 6883static void process_pending_rx(struct work_struct *work)
6884{
6885 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6886 pending_rx_work);
6887 struct sk_buff *skb;
6888
6889 BT_DBG("");
6890
6891 while ((skb = skb_dequeue(&conn->pending_rx)))
6892 l2cap_recv_frame(conn, skb);
6893}
6894
162b49e7
JH		 6895static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6896{
6897 struct l2cap_conn *conn = hcon->l2cap_data;
6898 struct hci_chan *hchan;
6899
6900 if (conn)
6901 return conn;
6902
6903 hchan = hci_chan_create(hcon);
6904 if (!hchan)
6905 return NULL;
6906
27f70f3e 6907 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
162b49e7
JH		 6908 if (!conn) {
6909 hci_chan_del(hchan);
6910 return NULL;
6911 }
6912
6913 kref_init(&conn->ref);
6914 hcon->l2cap_data = conn;
51bb8457 6915 conn->hcon = hci_conn_get(hcon);
162b49e7
JH		 6916 conn->hchan = hchan;
6917
6918 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6919
6920 switch (hcon->type) {
6921 case LE_LINK:
6922 if (hcon->hdev->le_mtu) {
6923 conn->mtu = hcon->hdev->le_mtu;
6924 break;
6925 }
6926 /* fall through */
6927 default:
6928 conn->mtu = hcon->hdev->acl_mtu;
6929 break;
6930 }
6931
6932 conn->feat_mask = 0;
6933
6934 if (hcon->type == ACL_LINK)
6935 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
6936 &hcon->hdev->dev_flags);
6937
5a54e7c8 6938 mutex_init(&conn->ident_lock);
162b49e7
JH		 6939 mutex_init(&conn->chan_lock);
6940
6941 INIT_LIST_HEAD(&conn->chan_l);
6942 INIT_LIST_HEAD(&conn->users);
6943
276d8073 6944 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
162b49e7 6945
61a939c6
JH		 6946 skb_queue_head_init(&conn->pending_rx);
6947 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
f3d82d0c 6948 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
61a939c6 6949
162b49e7
JH		 6950 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
6951
6952 return conn;
6953}
6954
6955static bool is_valid_psm(u16 psm, u8 dst_type) {
6956 if (!psm)
6957 return false;
6958
6959 if (bdaddr_type_is_le(dst_type))
6960 return (psm <= 0x00ff);
6961
6962 /* PSM must be odd and lsb of upper byte must be 0 */
6963 return ((psm & 0x0101) == 0x0001);
6964}
6965
6966int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
6967 bdaddr_t *dst, u8 dst_type)
6968{
6969 struct l2cap_conn *conn;
6970 struct hci_conn *hcon;
6971 struct hci_dev *hdev;
162b49e7
JH		 6972 int err;
6973
6974 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
6975 dst_type, __le16_to_cpu(psm));
6976
6977 hdev = hci_get_route(dst, &chan->src);
6978 if (!hdev)
6979 return -EHOSTUNREACH;
6980
6981 hci_dev_lock(hdev);
6982
6983 l2cap_chan_lock(chan);
6984
6985 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
6986 chan->chan_type != L2CAP_CHAN_RAW) {
6987 err = -EINVAL;
6988 goto done;
6989 }
6990
21626e62
JH		 6991 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
6992 err = -EINVAL;
6993 goto done;
6994 }
6995
6996 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 6997 err = -EINVAL;
6998 goto done;
6999 }
7000
7001 switch (chan->mode) {
7002 case L2CAP_MODE_BASIC:
7003 break;
7004 case L2CAP_MODE_LE_FLOWCTL:
7005 l2cap_le_flowctl_init(chan);
7006 break;
7007 case L2CAP_MODE_ERTM:
7008 case L2CAP_MODE_STREAMING:
7009 if (!disable_ertm)
7010 break;
7011 /* fall through */
7012 default:
beb19e4c 7013 err = -EOPNOTSUPP;
162b49e7
JH		 7014 goto done;
7015 }
7016
7017 switch (chan->state) {
7018 case BT_CONNECT:
7019 case BT_CONNECT2:
7020 case BT_CONFIG:
7021 /* Already connecting */
7022 err = 0;
7023 goto done;
7024
7025 case BT_CONNECTED:
7026 /* Already connected */
7027 err = -EISCONN;
7028 goto done;
7029
7030 case BT_OPEN:
7031 case BT_BOUND:
7032 /* Can connect */
7033 break;
7034
7035 default:
7036 err = -EBADFD;
7037 goto done;
7038 }
7039
7040 /* Set destination address and psm */
7041 bacpy(&chan->dst, dst);
7042 chan->dst_type = dst_type;
7043
7044 chan->psm = psm;
7045 chan->dcid = cid;
7046
6f77d8c7 7047 if (bdaddr_type_is_le(dst_type)) {
e804d25d 7048 u8 role;
cdd6275e 7049
6f77d8c7
AG		 7050 /* Convert from L2CAP channel address type to HCI address type
7051 */
7052 if (dst_type == BDADDR_LE_PUBLIC)
7053 dst_type = ADDR_LE_DEV_PUBLIC;
7054 else
7055 dst_type = ADDR_LE_DEV_RANDOM;
7056
e804d25d
JH		 7057 if (test_bit(HCI_ADVERTISING, &hdev->dev_flags))
7058 role = HCI_ROLE_SLAVE;
7059 else
7060 role = HCI_ROLE_MASTER;
cdd6275e 7061
04a6c589 7062 hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level,
e804d25d 7063 HCI_LE_CONN_TIMEOUT, role);
6f77d8c7 7064 } else {
d93375a8 7065 u8 auth_type = l2cap_get_auth_type(chan);
04a6c589 7066 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7067 }
162b49e7
JH		 7068
7069 if (IS_ERR(hcon)) {
7070 err = PTR_ERR(hcon);
7071 goto done;
7072 }
7073
7074 conn = l2cap_conn_add(hcon);
7075 if (!conn) {
7076 hci_conn_drop(hcon);
7077 err = -ENOMEM;
7078 goto done;
7079 }
7080
7081 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7082 hci_conn_drop(hcon);
7083 err = -EBUSY;
7084 goto done;
7085 }
7086
7087 /* Update source addr of the socket */
7088 bacpy(&chan->src, &hcon->src);
7089 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7090
162b49e7 7091 l2cap_chan_add(conn, chan);
162b49e7
JH		 7092
7093 /* l2cap_chan_add takes its own ref so we can drop this one */
7094 hci_conn_drop(hcon);
7095
7096 l2cap_state_change(chan, BT_CONNECT);
7097 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7098
61202e4d
JH		 7099 /* Release chan->sport so that it can be reused by other
7100 * sockets (as it's only used for listening sockets).
7101 */
7102 write_lock(&chan_list_lock);
7103 chan->sport = 0;
7104 write_unlock(&chan_list_lock);
7105
162b49e7
JH		 7106 if (hcon->state == BT_CONNECTED) {
7107 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7108 __clear_chan_timer(chan);
e7cafc45 7109 if (l2cap_chan_check_security(chan, true))
162b49e7
JH		 7110 l2cap_state_change(chan, BT_CONNECTED);
7111 } else
7112 l2cap_do_start(chan);
7113 }
7114
7115 err = 0;
7116
7117done:
7118 l2cap_chan_unlock(chan);
7119 hci_dev_unlock(hdev);
7120 hci_dev_put(hdev);
7121 return err;
7122}
6b8d4a6a 7123EXPORT_SYMBOL_GPL(l2cap_chan_connect);
162b49e7 7124
1da177e4
LT		 7125/* ---- L2CAP interface with lower layer (HCI) ---- */
7126
686ebf28 7127int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7128{
7129 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7130 struct l2cap_chan *c;
1da177e4 7131
6ed93dc6 7132 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7133
7134 /* Find listening sockets and check their link_mode */
23691d75
GP		 7135 read_lock(&chan_list_lock);
7136 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7137 if (c->state != BT_LISTEN)
1da177e4
LT		 7138 continue;
7139
7eafc59e 7140 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7141 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7142 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7143 lm1 |= HCI_LM_MASTER;
1da177e4 7144 exact++;
7eafc59e 7145 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7146 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7147 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7148 lm2 |= HCI_LM_MASTER;
7149 }
1da177e4 7150 }
23691d75 7151 read_unlock(&chan_list_lock);
1da177e4
LT		 7152
7153 return exact ? lm1 : lm2;
7154}
7155
e760ec12
JH		 7156/* Find the next fixed channel in BT_LISTEN state, continue iteration
7157 * from an existing channel in the list or from the beginning of the
7158 * global list (by passing NULL as first parameter).
7159 */
7160static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
54a1b626 7161 bdaddr_t *src, u8 link_type)
e760ec12
JH		 7162{
7163 read_lock(&chan_list_lock);
7164
7165 if (c)
7166 c = list_next_entry(c, global_l);
7167 else
7168 c = list_entry(chan_list.next, typeof(*c), global_l);
7169
7170 list_for_each_entry_from(c, &chan_list, global_l) {
7171 if (c->chan_type != L2CAP_CHAN_FIXED)
7172 continue;
7173 if (c->state != BT_LISTEN)
7174 continue;
7175 if (bacmp(&c->src, src) && bacmp(&c->src, BDADDR_ANY))
7176 continue;
54a1b626
JH		 7177 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
7178 continue;
7179 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
7180 continue;
e760ec12
JH		 7181
7182 l2cap_chan_hold(c);
7183 read_unlock(&chan_list_lock);
7184 return c;
7185 }
7186
7187 read_unlock(&chan_list_lock);
7188
7189 return NULL;
7190}
7191
9e664631 7192void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7193{
e760ec12 7194 struct hci_dev *hdev = hcon->hdev;
0139418c 7195 struct l2cap_conn *conn;
e760ec12
JH		 7196 struct l2cap_chan *pchan;
7197 u8 dst_type;
0139418c 7198
6ed93dc6 7199 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7200
dc0f5088 7201 if (status) {
e175072f 7202 l2cap_conn_del(hcon, bt_to_errno(status));
dc0f5088 7203 return;
ba6fc317 7204 }
dc0f5088
JH		 7205
7206 conn = l2cap_conn_add(hcon);
7207 if (!conn)
7208 return;
7209
e760ec12
JH		 7210 dst_type = bdaddr_type(hcon, hcon->dst_type);
7211
7212 /* If device is blocked, do not create channels for it */
7213 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7214 return;
7215
7216 /* Find fixed channels and notify them of the new connection. We
7217 * use multiple individual lookups, continuing each time where
7218 * we left off, because the list lock would prevent calling the
7219 * potentially sleeping l2cap_chan_lock() function.
7220 */
54a1b626 7221 pchan = l2cap_global_fixed_chan(NULL, &hdev->bdaddr, hcon->type);
e760ec12
JH		 7222 while (pchan) {
7223 struct l2cap_chan *chan, *next;
7224
7225 /* Client fixed channels should override server ones */
7226 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7227 goto next;
7228
7229 l2cap_chan_lock(pchan);
7230 chan = pchan->ops->new_connection(pchan);
7231 if (chan) {
7232 bacpy(&chan->src, &hcon->src);
7233 bacpy(&chan->dst, &hcon->dst);
7234 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7235 chan->dst_type = dst_type;
7236
7237 __l2cap_chan_add(conn, chan);
7238 }
7239
7240 l2cap_chan_unlock(pchan);
7241next:
54a1b626
JH		 7242 next = l2cap_global_fixed_chan(pchan, &hdev->bdaddr,
7243 hcon->type);
e760ec12
JH		 7244 l2cap_chan_put(pchan);
7245 pchan = next;
7246 }
7247
dc0f5088 7248 l2cap_conn_ready(conn);
1da177e4
LT		 7249}
7250
686ebf28 7251int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7252{
7253 struct l2cap_conn *conn = hcon->l2cap_data;
7254
7255 BT_DBG("hcon %p", hcon);
7256
686ebf28 7257 if (!conn)
9f5a0d7b 7258 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7259 return conn->disc_reason;
7260}
7261
9e664631 7262void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 7263{
7264 BT_DBG("hcon %p reason %d", hcon, reason);
7265
e175072f 7266 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7267}
7268
4343478f 7269static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7270{
715ec005 7271 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7272 return;
7273
f62e4323 7274 if (encrypt == 0x00) {
4343478f 7275 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7276 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7277 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7278 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7279 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7280 } else {
4343478f 7281 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7282 __clear_chan_timer(chan);
f62e4323
MH		 7283 }
7284}
7285
686ebf28 7286int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7287{
0139418c 7288 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7289 struct l2cap_chan *chan;
1da177e4 7290
0139418c 7291 if (!conn)
1da177e4 7292 return 0;
0139418c 7293
89d8b407 7294 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7295
3df91ea2 7296 mutex_lock(&conn->chan_lock);
1da177e4 7297
3df91ea2 7298 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7299 l2cap_chan_lock(chan);
1da177e4 7300
89d8b407
AE		 7301 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7302 state_to_string(chan->state));
f1cb9af5 7303
2338a7e0 7304 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7305 l2cap_chan_unlock(chan);
7306 continue;
7307 }
7308
191eb398
JH		 7309 if (!status && encrypt)
7310 chan->sec_level = hcon->sec_level;
f1cb9af5 7311
96eff46e 7312 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7313 l2cap_chan_unlock(chan);
6a8d3010
MH		 7314 continue;
7315 }
7316
89bc500e 7317 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7318 chan->state == BT_CONFIG)) {
d97c899b 7319 chan->ops->resume(chan);
4343478f 7320 l2cap_check_encryption(chan, encrypt);
6be36555 7321 l2cap_chan_unlock(chan);
9719f8af
MH		 7322 continue;
7323 }
7324
89bc500e 7325 if (chan->state == BT_CONNECT) {
6d3c15da 7326 if (!status)
93c3e8f5 7327 l2cap_start_connection(chan);
6d3c15da 7328 else
ba13ccd9 7329 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
89bc500e 7330 } else if (chan->state == BT_CONNECT2) {
b1235d79 7331 struct l2cap_conn_rsp rsp;
df3c3931 7332 __u16 res, stat;
1da177e4 7333
b1235d79 7334 if (!status) {
bdc25783 7335 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7336 res = L2CAP_CR_PEND;
7337 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7338 chan->ops->defer(chan);
df3c3931 7339 } else {
acdcabf5 7340 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7341 res = L2CAP_CR_SUCCESS;
7342 stat = L2CAP_CS_NO_INFO;
7343 }
b1235d79 7344 } else {
acdcabf5 7345 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7346 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7347 res = L2CAP_CR_SEC_BLOCK;
7348 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7349 }
7350
fe4128e0
GP		 7351 rsp.scid = cpu_to_le16(chan->dcid);
7352 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7353 rsp.result = cpu_to_le16(res);
7354 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7355 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7356 sizeof(rsp), &rsp);
2d369359
MM		 7357
7358 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7359 res == L2CAP_CR_SUCCESS) {
7360 char buf[128];
7361 set_bit(CONF_REQ_SENT, &chan->conf_state);
7362 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7363 L2CAP_CONF_REQ,
7364 l2cap_build_conf_req(chan, buf),
7365 buf);
7366 chan->num_conf_req++;
7367 }
b1235d79 7368 }
1da177e4 7369
6be36555 7370 l2cap_chan_unlock(chan);
1da177e4
LT		 7371 }
7372
3df91ea2 7373 mutex_unlock(&conn->chan_lock);
b1235d79 7374
1da177e4
LT		 7375 return 0;
7376}
7377
686ebf28 7378int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7379{
7380 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7381 struct l2cap_hdr *hdr;
7382 int len;
1da177e4 7383
1d13a254
AE		 7384 /* For AMP controller do not create l2cap conn */
7385 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7386 goto drop;
1da177e4 7387
5a08ecce 7388 if (!conn)
baf43251 7389 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7390
7391 if (!conn)
1da177e4
LT		 7392 goto drop;
7393
7394 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7395
d73a0988
AE		 7396 switch (flags) {
7397 case ACL_START:
7398 case ACL_START_NO_FLUSH:
7399 case ACL_COMPLETE:
1da177e4
LT		 7400 if (conn->rx_len) {
7401 BT_ERR("Unexpected start frame (len %d)", skb->len);
7402 kfree_skb(conn->rx_skb);
7403 conn->rx_skb = NULL;
7404 conn->rx_len = 0;
7405 l2cap_conn_unreliable(conn, ECOMM);
7406 }
7407
aae7fe22
AE		 7408 /* Start fragment always begin with Basic L2CAP header */
7409 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7410 BT_ERR("Frame is too short (len %d)", skb->len);
7411 l2cap_conn_unreliable(conn, ECOMM);
7412 goto drop;
7413 }
7414
7415 hdr = (struct l2cap_hdr *) skb->data;
7416 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7417
7418 if (len == skb->len) {
7419 /* Complete frame received */
7420 l2cap_recv_frame(conn, skb);
7421 return 0;
7422 }
7423
7424 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7425
7426 if (skb->len > len) {
7427 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7428 skb->len, len);
1da177e4
LT		 7429 l2cap_conn_unreliable(conn, ECOMM);
7430 goto drop;
7431 }
7432
7433 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7434 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7435 if (!conn->rx_skb)
1da177e4
LT		 7436 goto drop;
7437
d626f62b 7438 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7439 skb->len);
1da177e4 7440 conn->rx_len = len - skb->len;
d73a0988
AE		 7441 break;
7442
7443 case ACL_CONT:
1da177e4
LT		 7444 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7445
7446 if (!conn->rx_len) {
7447 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7448 l2cap_conn_unreliable(conn, ECOMM);
7449 goto drop;
7450 }
7451
7452 if (skb->len > conn->rx_len) {
7453 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7454 skb->len, conn->rx_len);
1da177e4
LT		 7455 kfree_skb(conn->rx_skb);
7456 conn->rx_skb = NULL;
7457 conn->rx_len = 0;
7458 l2cap_conn_unreliable(conn, ECOMM);
7459 goto drop;
7460 }
7461
d626f62b 7462 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7463 skb->len);
1da177e4
LT		 7464 conn->rx_len -= skb->len;
7465
7466 if (!conn->rx_len) {
c4e5bafa
JH		 7467 /* Complete frame received. l2cap_recv_frame
7468 * takes ownership of the skb so set the global
7469 * rx_skb pointer to NULL first.
7470 */
7471 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7472 conn->rx_skb = NULL;
c4e5bafa 7473 l2cap_recv_frame(conn, rx_skb);
1da177e4 7474 }
d73a0988 7475 break;
1da177e4
LT		 7476 }
7477
7478drop:
7479 kfree_skb(skb);
7480 return 0;
7481}
7482
aef7d97c 7483static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7484{
23691d75 7485 struct l2cap_chan *c;
1da177e4 7486
333055f2 7487 read_lock(&chan_list_lock);
1da177e4 7488
23691d75 7489 list_for_each_entry(c, &chan_list, global_l) {
fcb73338 7490 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7eafc59e 7491 &c->src, &c->dst,
fcb73338
AE		 7492 c->state, __le16_to_cpu(c->psm),
7493 c->scid, c->dcid, c->imtu, c->omtu,
7494 c->sec_level, c->mode);
61e1b4b7 7495 }
1da177e4 7496
333055f2 7497 read_unlock(&chan_list_lock);
1da177e4 7498
aef7d97c 7499 return 0;
1da177e4
LT		 7500}
7501
aef7d97c
MH		 7502static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7503{
7504 return single_open(file, l2cap_debugfs_show, inode->i_private);
7505}
7506
7507static const struct file_operations l2cap_debugfs_fops = {
7508 .open = l2cap_debugfs_open,
7509 .read = seq_read,
7510 .llseek = seq_lseek,
7511 .release = single_release,
7512};
7513
7514static struct dentry *l2cap_debugfs;
1da177e4 7515
64274518 7516int __init l2cap_init(void)
1da177e4
LT		 7517{
7518 int err;
be9d1227 7519
bb58f747 7520 err = l2cap_init_sockets();
1da177e4
LT		 7521 if (err < 0)
7522 return err;
7523
1120e4bf
MH		 7524 if (IS_ERR_OR_NULL(bt_debugfs))
7525 return 0;
7526
7527 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7528 NULL, &l2cap_debugfs_fops);
1da177e4 7529
40b9397a 7530 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
f15b8ecf 7531 &le_max_credits);
40b9397a 7532 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
f15b8ecf
JH		 7533 &le_default_mps);
7534
1da177e4 7535 return 0;
1da177e4
LT		 7536}
7537
64274518 7538void l2cap_exit(void)
1da177e4 7539{
aef7d97c 7540 debugfs_remove(l2cap_debugfs);
bb58f747 7541 l2cap_cleanup_sockets();
1da177e4
LT		 7542}
7543
d1c4a17d
GP		 7544module_param(disable_ertm, bool, 0644);
7545MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux 6.x block layer and io_uring tree(s)