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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
[deliverable/linux.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
422e925b 7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
1da177e4
LT		 8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
8e87d142
YH		 24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 26 SOFTWARE IS DISCLAIMED.
27*/
28
bb58f747 29/* Bluetooth L2CAP core. */
1da177e4 30
1da177e4
LT		 31#include <linux/module.h>
32
aef7d97c 33#include <linux/debugfs.h>
fcc203c3 34#include <linux/crc16.h>
1da177e4
LT		 35
36#include <net/bluetooth/bluetooth.h>
37#include <net/bluetooth/hci_core.h>
38#include <net/bluetooth/l2cap.h>
7ef9fbf0 39
ac4b7236 40#include "smp.h"
7024728e 41#include "a2mp.h"
7ef9fbf0 42#include "amp.h"
1da177e4 43
0f1bfe4e
JH		 44#define LE_FLOWCTL_MAX_CREDITS 65535
45
d1de6d46 46bool disable_ertm;
f0709e03 47
547d1032 48static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
1da177e4 49
b5ad8b7f
JB		 50static LIST_HEAD(chan_list);
51static DEFINE_RWLOCK(chan_list_lock);
1da177e4 52
f15b8ecf
JH		 53static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
54static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
55
1da177e4 56static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 57 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 58static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 59 void *data);
710f9b0a 60static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 61static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 62
d660366d 63static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 64 struct sk_buff_head *skbs, u8 event);
608bcc6d 65
a250e048 66static inline u8 bdaddr_type(u8 link_type, u8 bdaddr_type)
4f1654e0 67{
a250e048
JH		 68 if (link_type == LE_LINK) {
69 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
4f1654e0
MH		 70 return BDADDR_LE_PUBLIC;
71 else
72 return BDADDR_LE_RANDOM;
73 }
74
75 return BDADDR_BREDR;
76}
77
a250e048
JH		 78static inline u8 bdaddr_src_type(struct hci_conn *hcon)
79{
80 return bdaddr_type(hcon->type, hcon->src_type);
81}
82
83static inline u8 bdaddr_dst_type(struct hci_conn *hcon)
84{
85 return bdaddr_type(hcon->type, hcon->dst_type);
86}
87
0139418c 88/* ---- L2CAP channels ---- */
71ba0e56 89
2d792818
GP		 90static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
91 u16 cid)
0139418c 92{
3df91ea2 93 struct l2cap_chan *c;
3d57dc68 94
3df91ea2
AE		 95 list_for_each_entry(c, &conn->chan_l, list) {
96 if (c->dcid == cid)
97 return c;
0139418c 98 }
3df91ea2 99 return NULL;
0139418c
MH		 100}
101
2d792818
GP		 102static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
103 u16 cid)
0139418c 104{
3df91ea2 105 struct l2cap_chan *c;
3d57dc68 106
3df91ea2
AE		 107 list_for_each_entry(c, &conn->chan_l, list) {
108 if (c->scid == cid)
109 return c;
0139418c 110 }
3df91ea2 111 return NULL;
0139418c
MH		 112}
113
114/* Find channel with given SCID.
ef191ade 115 * Returns locked channel. */
2d792818
GP		 116static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
117 u16 cid)
0139418c 118{
48454079 119 struct l2cap_chan *c;
baa7e1fa 120
3df91ea2 121 mutex_lock(&conn->chan_lock);
baa7e1fa 122 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 123 if (c)
124 l2cap_chan_lock(c);
3df91ea2
AE		 125 mutex_unlock(&conn->chan_lock);
126
48454079 127 return c;
0139418c
MH		 128}
129
b1a130b7
MM		 130/* Find channel with given DCID.
131 * Returns locked channel.
132 */
133static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
134 u16 cid)
135{
136 struct l2cap_chan *c;
137
138 mutex_lock(&conn->chan_lock);
139 c = __l2cap_get_chan_by_dcid(conn, cid);
140 if (c)
141 l2cap_chan_lock(c);
142 mutex_unlock(&conn->chan_lock);
143
144 return c;
145}
146
2d792818
GP		 147static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
148 u8 ident)
0139418c 149{
3df91ea2 150 struct l2cap_chan *c;
3d57dc68 151
3df91ea2
AE		 152 list_for_each_entry(c, &conn->chan_l, list) {
153 if (c->ident == ident)
154 return c;
0139418c 155 }
3df91ea2 156 return NULL;
0139418c
MH		 157}
158
5b155ef9
MM		 159static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
160 u8 ident)
161{
162 struct l2cap_chan *c;
163
164 mutex_lock(&conn->chan_lock);
165 c = __l2cap_get_chan_by_ident(conn, ident);
166 if (c)
167 l2cap_chan_lock(c);
168 mutex_unlock(&conn->chan_lock);
169
170 return c;
171}
172
23691d75 173static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 174{
23691d75 175 struct l2cap_chan *c;
9e4425ff 176
23691d75 177 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 178 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 179 return c;
9e4425ff 180 }
250938cb 181 return NULL;
9e4425ff
GP		 182}
183
184int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
185{
73b2ec18
GP		 186 int err;
187
333055f2 188 write_lock(&chan_list_lock);
9e4425ff 189
23691d75 190 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 191 err = -EADDRINUSE;
192 goto done;
9e4425ff
GP		 193 }
194
73b2ec18
GP		 195 if (psm) {
196 chan->psm = psm;
197 chan->sport = psm;
198 err = 0;
199 } else {
92594a51
JH		 200 u16 p, start, end, incr;
201
202 if (chan->src_type == BDADDR_BREDR) {
203 start = L2CAP_PSM_DYN_START;
204 end = L2CAP_PSM_AUTO_END;
205 incr = 2;
206 } else {
207 start = L2CAP_PSM_LE_DYN_START;
208 end = L2CAP_PSM_LE_DYN_END;
209 incr = 1;
210 }
73b2ec18
GP		 211
212 err = -EINVAL;
92594a51 213 for (p = start; p <= end; p += incr)
23691d75 214 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 215 chan->psm = cpu_to_le16(p);
216 chan->sport = cpu_to_le16(p);
217 err = 0;
218 break;
219 }
220 }
9e4425ff 221
73b2ec18 222done:
333055f2 223 write_unlock(&chan_list_lock);
73b2ec18 224 return err;
9e4425ff 225}
6b8d4a6a 226EXPORT_SYMBOL_GPL(l2cap_add_psm);
9e4425ff
GP		 227
228int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
229{
333055f2 230 write_lock(&chan_list_lock);
9e4425ff 231
14824308
JH		 232 /* Override the defaults (which are for conn-oriented) */
233 chan->omtu = L2CAP_DEFAULT_MTU;
234 chan->chan_type = L2CAP_CHAN_FIXED;
235
9e4425ff
GP		 236 chan->scid = scid;
237
333055f2 238 write_unlock(&chan_list_lock);
9e4425ff
GP		 239
240 return 0;
241}
242
baa7e1fa 243static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 244{
e77af755 245 u16 cid, dyn_end;
0139418c 246
e77af755
JH		 247 if (conn->hcon->type == LE_LINK)
248 dyn_end = L2CAP_CID_LE_DYN_END;
249 else
250 dyn_end = L2CAP_CID_DYN_END;
251
ab0c127f 252 for (cid = L2CAP_CID_DYN_START; cid <= dyn_end; cid++) {
baa7e1fa 253 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 254 return cid;
255 }
256
257 return 0;
258}
259
f93fa273 260static void l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 261{
42d2d87c 262 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 263 state_to_string(state));
badaaa00 264
89bc500e 265 chan->state = state;
53f52121 266 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 267}
268
f8e73017
GP		 269static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
270 int state, int err)
2e0052e4 271{
f8e73017 272 chan->state = state;
53f52121 273 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 274}
275
276static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
277{
f8e73017 278 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 279}
280
4239d16f
MM		 281static void __set_retrans_timer(struct l2cap_chan *chan)
282{
283 if (!delayed_work_pending(&chan->monitor_timer) &&
284 chan->retrans_timeout) {
285 l2cap_set_timer(chan, &chan->retrans_timer,
286 msecs_to_jiffies(chan->retrans_timeout));
287 }
288}
289
290static void __set_monitor_timer(struct l2cap_chan *chan)
291{
292 __clear_retrans_timer(chan);
293 if (chan->monitor_timeout) {
294 l2cap_set_timer(chan, &chan->monitor_timer,
295 msecs_to_jiffies(chan->monitor_timeout));
296 }
297}
298
608bcc6d
MM		 299static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
300 u16 seq)
301{
302 struct sk_buff *skb;
303
304 skb_queue_walk(head, skb) {
a4368ff3 305 if (bt_cb(skb)->l2cap.txseq == seq)
608bcc6d
MM		 306 return skb;
307 }
308
309 return NULL;
310}
311
3c588192
MM		 312/* ---- L2CAP sequence number lists ---- */
313
314/* For ERTM, ordered lists of sequence numbers must be tracked for
315 * SREJ requests that are received and for frames that are to be
316 * retransmitted. These seq_list functions implement a singly-linked
317 * list in an array, where membership in the list can also be checked
318 * in constant time. Items can also be added to the tail of the list
319 * and removed from the head in constant time, without further memory
320 * allocs or frees.
321 */
322
323static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
324{
325 size_t alloc_size, i;
326
327 /* Allocated size is a power of 2 to map sequence numbers
328 * (which may be up to 14 bits) in to a smaller array that is
329 * sized for the negotiated ERTM transmit windows.
330 */
331 alloc_size = roundup_pow_of_two(size);
332
333 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
334 if (!seq_list->list)
335 return -ENOMEM;
336
337 seq_list->mask = alloc_size - 1;
338 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
339 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
340 for (i = 0; i < alloc_size; i++)
341 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
342
343 return 0;
344}
345
346static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
347{
348 kfree(seq_list->list);
349}
350
351static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
352 u16 seq)
353{
354 /* Constant-time check for list membership */
355 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
356}
357
03a0c5d6 358static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
3c588192 359{
03a0c5d6 360 u16 seq = seq_list->head;
3c588192
MM		 361 u16 mask = seq_list->mask;
362
03a0c5d6
JH		 363 seq_list->head = seq_list->list[seq & mask];
364 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
365
366 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
367 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
368 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192 369 }
3c588192 370
03a0c5d6 371 return seq;
3c588192
MM		 372}
373
374static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
375{
f522ae36 376 u16 i;
3c588192 377
f522ae36
GP		 378 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
379 return;
380
381 for (i = 0; i <= seq_list->mask; i++)
382 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
383
384 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
385 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 386}
387
388static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
389{
390 u16 mask = seq_list->mask;
391
392 /* All appends happen in constant time */
393
f522ae36
GP		 394 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
395 return;
3c588192 396
f522ae36
GP		 397 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
398 seq_list->head = seq;
399 else
400 seq_list->list[seq_list->tail & mask] = seq;
401
402 seq_list->tail = seq;
403 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 404}
405
721c4181 406static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 407{
721c4181 408 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 409 chan_timer.work);
3df91ea2 410 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 411 int reason;
412
e05dcc32 413 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 414
3df91ea2 415 mutex_lock(&conn->chan_lock);
6be36555 416 l2cap_chan_lock(chan);
ab07801d 417
89bc500e 418 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 419 reason = ECONNREFUSED;
89bc500e 420 else if (chan->state == BT_CONNECT &&
2d792818 421 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 422 reason = ECONNREFUSED;
423 else
424 reason = ETIMEDOUT;
425
0f852724 426 l2cap_chan_close(chan, reason);
ab07801d 427
6be36555 428 l2cap_chan_unlock(chan);
ab07801d 429
80b98027 430 chan->ops->close(chan);
3df91ea2
AE		 431 mutex_unlock(&conn->chan_lock);
432
371fd835 433 l2cap_chan_put(chan);
ab07801d
GP		 434}
435
eef1d9b6 436struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 437{
438 struct l2cap_chan *chan;
439
440 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
441 if (!chan)
442 return NULL;
443
c03b355e
AE		 444 mutex_init(&chan->lock);
445
ff714119
JH		 446 /* Set default lock nesting level */
447 atomic_set(&chan->nesting, L2CAP_NESTING_NORMAL);
448
333055f2 449 write_lock(&chan_list_lock);
23691d75 450 list_add(&chan->global_l, &chan_list);
333055f2 451 write_unlock(&chan_list_lock);
23691d75 452
721c4181 453 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 454
89bc500e
GP		 455 chan->state = BT_OPEN;
456
144ad330 457 kref_init(&chan->kref);
71ba0e56 458
2827011f
MM		 459 /* This flag is cleared in l2cap_chan_ready() */
460 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
461
eef1d9b6 462 BT_DBG("chan %p", chan);
abc545b8 463
48454079
GP		 464 return chan;
465}
6b8d4a6a 466EXPORT_SYMBOL_GPL(l2cap_chan_create);
48454079 467
144ad330 468static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 469{
144ad330
SS		 470 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
471
4af66c69
JK		 472 BT_DBG("chan %p", chan);
473
333055f2 474 write_lock(&chan_list_lock);
23691d75 475 list_del(&chan->global_l);
333055f2 476 write_unlock(&chan_list_lock);
23691d75 477
4af66c69 478 kfree(chan);
6ff5abbf
GP		 479}
480
30648372
JK		 481void l2cap_chan_hold(struct l2cap_chan *c)
482{
144ad330 483 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 484
144ad330 485 kref_get(&c->kref);
30648372
JK		 486}
487
488void l2cap_chan_put(struct l2cap_chan *c)
489{
144ad330 490 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 491
144ad330 492 kref_put(&c->kref, l2cap_chan_destroy);
30648372 493}
6b8d4a6a 494EXPORT_SYMBOL_GPL(l2cap_chan_put);
30648372 495
bd4b1653
AE		 496void l2cap_chan_set_defaults(struct l2cap_chan *chan)
497{
498 chan->fcs = L2CAP_FCS_CRC16;
499 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
500 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
501 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
6a5e8165
JR		 502 chan->remote_max_tx = chan->max_tx;
503 chan->remote_tx_win = chan->tx_win;
c20f8e35 504 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653 505 chan->sec_level = BT_SECURITY_LOW;
6a5e8165
JR		 506 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
507 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
508 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
509 chan->conf_state = 0;
bd4b1653
AE		 510
511 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
512}
6b8d4a6a 513EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
bd4b1653 514
0ce43ce6 515static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 516{
0ce43ce6
JH		 517 chan->sdu = NULL;
518 chan->sdu_last_frag = NULL;
519 chan->sdu_len = 0;
0cd75f7e 520 chan->tx_credits = 0;
f15b8ecf 521 chan->rx_credits = le_max_credits;
d1d79413 522 chan->mps = min_t(u16, chan->imtu, le_default_mps);
0ce43ce6
JH		 523
524 skb_queue_head_init(&chan->tx_q);
38319713
JH		 525}
526
93c3e8f5 527void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 528{
af05b30b 529 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 530 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 531
9f5a0d7b 532 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 533
8c1d787b 534 chan->conn = conn;
0139418c 535
5491120e
AE		 536 switch (chan->chan_type) {
537 case L2CAP_CHAN_CONN_ORIENTED:
21626e62
JH		 538 /* Alloc CID for connection-oriented socket */
539 chan->scid = l2cap_alloc_cid(conn);
540 if (conn->hcon->type == ACL_LINK)
0c1bc5c6 541 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 542 break;
543
544 case L2CAP_CHAN_CONN_LESS:
0139418c 545 /* Connectionless socket */
fe4128e0
GP		 546 chan->scid = L2CAP_CID_CONN_LESS;
547 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 548 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 549 break;
550
2338a7e0
JH		 551 case L2CAP_CHAN_FIXED:
552 /* Caller will set CID and CID specific MTU values */
416fa752
AE		 553 break;
554
5491120e 555 default:
0139418c 556 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 557 chan->scid = L2CAP_CID_SIGNALING;
558 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 559 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 560 }
561
8f7975b1
AE		 562 chan->local_id = L2CAP_BESTEFFORT_ID;
563 chan->local_stype = L2CAP_SERV_BESTEFFORT;
564 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
565 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
566 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 567 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 568
371fd835 569 l2cap_chan_hold(chan);
baa7e1fa 570
c16900cf
JH		 571 /* Only keep a reference for fixed channels if they requested it */
572 if (chan->chan_type != L2CAP_CHAN_FIXED ||
573 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
574 hci_conn_hold(conn->hcon);
5ee9891d 575
3df91ea2 576 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 577}
578
466f8004 579void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 580{
581 mutex_lock(&conn->chan_lock);
582 __l2cap_chan_add(conn, chan);
3df91ea2 583 mutex_unlock(&conn->chan_lock);
0139418c
MH		 584}
585
466f8004 586void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 587{
8c1d787b 588 struct l2cap_conn *conn = chan->conn;
0139418c 589
c9b66675 590 __clear_chan_timer(chan);
0139418c 591
49d11741
JH		 592 BT_DBG("chan %p, conn %p, err %d, state %s", chan, conn, err,
593 state_to_string(chan->state));
0139418c 594
72847ce0
JH		 595 chan->ops->teardown(chan, err);
596
8e87d142 597 if (conn) {
56f60984 598 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 599 /* Delete from channel list */
3df91ea2 600 list_del(&chan->list);
3d57dc68 601
371fd835 602 l2cap_chan_put(chan);
baa7e1fa 603
8c1d787b 604 chan->conn = NULL;
3cabbfda 605
c16900cf
JH		 606 /* Reference was only held for non-fixed channels or
607 * fixed channels that explicitly requested it using the
608 * FLAG_HOLD_HCI_CONN flag.
609 */
610 if (chan->chan_type != L2CAP_CHAN_FIXED ||
611 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
76a68ba0 612 hci_conn_drop(conn->hcon);
56f60984
AE		 613
614 if (mgr && mgr->bredr_chan == chan)
615 mgr->bredr_chan = NULL;
0139418c
MH		 616 }
617
419e08c1
AE		 618 if (chan->hs_hchan) {
619 struct hci_chan *hs_hchan = chan->hs_hchan;
620
621 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
622 amp_disconnect_logical_link(hs_hchan);
623 }
624
2827011f 625 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 626 return;
2ead70b8 627
ee556f66
GP		 628 switch(chan->mode) {
629 case L2CAP_MODE_BASIC:
630 break;
c13ffa62 631
38319713 632 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 633 skb_queue_purge(&chan->tx_q);
38319713
JH		 634 break;
635
ee556f66 636 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 637 __clear_retrans_timer(chan);
638 __clear_monitor_timer(chan);
639 __clear_ack_timer(chan);
c13ffa62 640
f1c6775b 641 skb_queue_purge(&chan->srej_q);
c13ffa62 642
3c588192
MM		 643 l2cap_seq_list_free(&chan->srej_list);
644 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 645
646 /* fall through */
647
648 case L2CAP_MODE_STREAMING:
649 skb_queue_purge(&chan->tx_q);
650 break;
c13ffa62 651 }
ee556f66
GP		 652
653 return;
0139418c 654}
6b8d4a6a 655EXPORT_SYMBOL_GPL(l2cap_chan_del);
0139418c 656
f3d82d0c 657static void l2cap_conn_update_id_addr(struct work_struct *work)
387a33e3 658{
f3d82d0c
JH		 659 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
660 id_addr_update_work);
661 struct hci_conn *hcon = conn->hcon;
387a33e3
JH		 662 struct l2cap_chan *chan;
663
664 mutex_lock(&conn->chan_lock);
665
666 list_for_each_entry(chan, &conn->chan_l, list) {
667 l2cap_chan_lock(chan);
668 bacpy(&chan->dst, &hcon->dst);
a250e048 669 chan->dst_type = bdaddr_dst_type(hcon);
387a33e3
JH		 670 l2cap_chan_unlock(chan);
671 }
672
673 mutex_unlock(&conn->chan_lock);
674}
675
27e2d4c8
JH		 676static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
677{
678 struct l2cap_conn *conn = chan->conn;
679 struct l2cap_le_conn_rsp rsp;
680 u16 result;
681
682 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
683 result = L2CAP_CR_AUTHORIZATION;
684 else
685 result = L2CAP_CR_BAD_PSM;
686
687 l2cap_state_change(chan, BT_DISCONN);
688
689 rsp.dcid = cpu_to_le16(chan->scid);
690 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 691 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 692 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 693 rsp.result = cpu_to_le16(result);
694
695 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
696 &rsp);
697}
698
791d60f7
JH		 699static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
700{
701 struct l2cap_conn *conn = chan->conn;
702 struct l2cap_conn_rsp rsp;
703 u16 result;
704
705 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
706 result = L2CAP_CR_SEC_BLOCK;
707 else
708 result = L2CAP_CR_BAD_PSM;
709
710 l2cap_state_change(chan, BT_DISCONN);
711
712 rsp.scid = cpu_to_le16(chan->dcid);
713 rsp.dcid = cpu_to_le16(chan->scid);
714 rsp.result = cpu_to_le16(result);
dcf4adbf 715 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
791d60f7
JH		 716
717 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
718}
719
0f852724 720void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 721{
722 struct l2cap_conn *conn = chan->conn;
4519de9a 723
7eafc59e 724 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 725
89bc500e 726 switch (chan->state) {
4519de9a 727 case BT_LISTEN:
b699ec0d 728 chan->ops->teardown(chan, 0);
4519de9a
GP		 729 break;
730
731 case BT_CONNECTED:
732 case BT_CONFIG:
7b25c9b3 733 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
8d836d71 734 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 735 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 736 } else
737 l2cap_chan_del(chan, reason);
738 break;
739
740 case BT_CONNECT2:
791d60f7
JH		 741 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
742 if (conn->hcon->type == ACL_LINK)
743 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 744 else if (conn->hcon->type == LE_LINK)
745 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 746 }
747
748 l2cap_chan_del(chan, reason);
749 break;
750
751 case BT_CONNECT:
752 case BT_DISCONN:
753 l2cap_chan_del(chan, reason);
754 break;
755
756 default:
b699ec0d 757 chan->ops->teardown(chan, 0);
4519de9a
GP		 758 break;
759 }
760}
6b8d4a6a 761EXPORT_SYMBOL(l2cap_chan_close);
4519de9a 762
4343478f 763static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 764{
6a974b50
MH		 765 switch (chan->chan_type) {
766 case L2CAP_CHAN_RAW:
4343478f 767 switch (chan->sec_level) {
8556edd3 768 case BT_SECURITY_HIGH:
7d513e92 769 case BT_SECURITY_FIPS:
8556edd3
JH		 770 return HCI_AT_DEDICATED_BONDING_MITM;
771 case BT_SECURITY_MEDIUM:
772 return HCI_AT_DEDICATED_BONDING;
773 default:
774 return HCI_AT_NO_BONDING;
775 }
6a974b50 776 break;
3124b843 777 case L2CAP_CHAN_CONN_LESS:
dcf4adbf 778 if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) {
3124b843
MH		 779 if (chan->sec_level == BT_SECURITY_LOW)
780 chan->sec_level = BT_SECURITY_SDP;
781 }
7d513e92
MH		 782 if (chan->sec_level == BT_SECURITY_HIGH ||
783 chan->sec_level == BT_SECURITY_FIPS)
3124b843
MH		 784 return HCI_AT_NO_BONDING_MITM;
785 else
786 return HCI_AT_NO_BONDING;
787 break;
6a974b50 788 case L2CAP_CHAN_CONN_ORIENTED:
dcf4adbf 789 if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) {
6a974b50
MH		 790 if (chan->sec_level == BT_SECURITY_LOW)
791 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 792
7d513e92
MH		 793 if (chan->sec_level == BT_SECURITY_HIGH ||
794 chan->sec_level == BT_SECURITY_FIPS)
6a974b50
MH		 795 return HCI_AT_NO_BONDING_MITM;
796 else
797 return HCI_AT_NO_BONDING;
798 }
799 /* fall through */
800 default:
4343478f 801 switch (chan->sec_level) {
00ae4af9 802 case BT_SECURITY_HIGH:
7d513e92 803 case BT_SECURITY_FIPS:
8556edd3 804 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 805 case BT_SECURITY_MEDIUM:
8556edd3 806 return HCI_AT_GENERAL_BONDING;
00ae4af9 807 default:
8556edd3 808 return HCI_AT_NO_BONDING;
00ae4af9 809 }
6a974b50 810 break;
0684e5f9 811 }
8556edd3
JH		 812}
813
814/* Service level security */
e7cafc45 815int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator)
8556edd3 816{
8c1d787b 817 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 818 __u8 auth_type;
819
a17de2fe
JH		 820 if (conn->hcon->type == LE_LINK)
821 return smp_conn_security(conn->hcon, chan->sec_level);
822
4343478f 823 auth_type = l2cap_get_auth_type(chan);
79d554a6 824
e7cafc45
JH		 825 return hci_conn_security(conn->hcon, chan->sec_level, auth_type,
826 initiator);
79d554a6
MH		 827}
828
b5ad8b7f 829static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 830{
831 u8 id;
832
833 /* Get next available identificator.
834 * 1 - 128 are used by kernel.
835 * 129 - 199 are reserved.
836 * 200 - 254 are used by utilities like l2ping, etc.
837 */
838
5a54e7c8 839 mutex_lock(&conn->ident_lock);
4e8402a3
MH		 840
841 if (++conn->tx_ident > 128)
842 conn->tx_ident = 1;
843
844 id = conn->tx_ident;
845
5a54e7c8 846 mutex_unlock(&conn->ident_lock);
4e8402a3
MH		 847
848 return id;
849}
850
2d792818
GP		 851static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
852 void *data)
4e8402a3
MH		 853{
854 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 855 u8 flags;
4e8402a3
MH		 856
857 BT_DBG("code 0x%2.2x", code);
858
859 if (!skb)
9a9c6a34 860 return;
4e8402a3 861
f6af675e
SW		 862 /* Use NO_FLUSH if supported or we have an LE link (which does
863 * not support auto-flushing packets) */
864 if (lmp_no_flush_capable(conn->hcon->hdev) ||
865 conn->hcon->type == LE_LINK)
e702112f
AE		 866 flags = ACL_START_NO_FLUSH;
867 else
868 flags = ACL_START;
869
14b12d0b 870 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 871 skb->priority = HCI_PRIO_MAX;
14b12d0b 872
73d80deb
LAD		 873 hci_send_acl(conn->hchan, skb, flags);
874}
875
02b0fbb9
MM		 876static bool __chan_is_moving(struct l2cap_chan *chan)
877{
878 return chan->move_state != L2CAP_MOVE_STABLE &&
879 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
880}
881
73d80deb
LAD		 882static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
883{
884 struct hci_conn *hcon = chan->conn->hcon;
885 u16 flags;
886
887 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 888 skb->priority);
73d80deb 889
d5f8a75d
MM		 890 if (chan->hs_hcon && !__chan_is_moving(chan)) {
891 if (chan->hs_hchan)
892 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
893 else
894 kfree_skb(skb);
895
896 return;
897 }
898
f6af675e
SW		 899 /* Use NO_FLUSH for LE links (where this is the only option) or
900 * if the BR/EDR link supports it and flushing has not been
901 * explicitly requested (through FLAG_FLUSHABLE).
902 */
903 if (hcon->type == LE_LINK ||
904 (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
905 lmp_no_flush_capable(hcon->hdev)))
73d80deb
LAD		 906 flags = ACL_START_NO_FLUSH;
907 else
908 flags = ACL_START;
14b12d0b 909
73d80deb
LAD		 910 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
911 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 912}
913
b76bbd66
MM		 914static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
915{
916 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
917 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
918
919 if (enh & L2CAP_CTRL_FRAME_TYPE) {
920 /* S-Frame */
921 control->sframe = 1;
922 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
923 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
924
925 control->sar = 0;
926 control->txseq = 0;
927 } else {
928 /* I-Frame */
929 control->sframe = 0;
930 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
931 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
932
933 control->poll = 0;
934 control->super = 0;
935 }
936}
937
b76bbd66
MM		 938static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
939{
940 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
941 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
942
943 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
944 /* S-Frame */
945 control->sframe = 1;
946 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
947 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
948
949 control->sar = 0;
950 control->txseq = 0;
951 } else {
952 /* I-Frame */
953 control->sframe = 0;
954 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
955 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
956
957 control->poll = 0;
958 control->super = 0;
959 }
960}
961
962static inline void __unpack_control(struct l2cap_chan *chan,
963 struct sk_buff *skb)
964{
965 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
966 __unpack_extended_control(get_unaligned_le32(skb->data),
a4368ff3 967 &bt_cb(skb)->l2cap);
cec8ab6e 968 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 969 } else {
970 __unpack_enhanced_control(get_unaligned_le16(skb->data),
a4368ff3 971 &bt_cb(skb)->l2cap);
cec8ab6e 972 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 973 }
974}
975
b5c6aaed
MM		 976static u32 __pack_extended_control(struct l2cap_ctrl *control)
977{
978 u32 packed;
979
980 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
981 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
982
983 if (control->sframe) {
984 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
985 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
986 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
987 } else {
988 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
989 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
990 }
991
992 return packed;
993}
994
995static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
996{
997 u16 packed;
998
999 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
1000 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
1001
1002 if (control->sframe) {
1003 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
1004 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
1005 packed |= L2CAP_CTRL_FRAME_TYPE;
1006 } else {
1007 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
1008 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
1009 }
1010
1011 return packed;
1012}
1013
b76bbd66
MM		 1014static inline void __pack_control(struct l2cap_chan *chan,
1015 struct l2cap_ctrl *control,
1016 struct sk_buff *skb)
1017{
1018 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1019 put_unaligned_le32(__pack_extended_control(control),
1020 skb->data + L2CAP_HDR_SIZE);
1021 } else {
1022 put_unaligned_le16(__pack_enhanced_control(control),
1023 skb->data + L2CAP_HDR_SIZE);
1024 }
1025}
1026
ba7aa64f
GP		 1027static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
1028{
1029 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1030 return L2CAP_EXT_HDR_SIZE;
1031 else
1032 return L2CAP_ENH_HDR_SIZE;
1033}
1034
a67d7f6f
MM		 1035static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
1036 u32 control)
b5c6aaed
MM		 1037{
1038 struct sk_buff *skb;
1039 struct l2cap_hdr *lh;
ba7aa64f 1040 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 1041
1042 if (chan->fcs == L2CAP_FCS_CRC16)
1043 hlen += L2CAP_FCS_SIZE;
1044
a67d7f6f 1045 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 1046
b5c6aaed 1047 if (!skb)
a67d7f6f 1048 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 1049
1050 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1051 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1052 lh->cid = cpu_to_le16(chan->dcid);
1053
a67d7f6f
MM		 1054 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1055 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1056 else
1057 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 1058
1059 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 1060 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 1061 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1062 }
1063
1064 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 1065 return skb;
1066}
1067
1068static void l2cap_send_sframe(struct l2cap_chan *chan,
1069 struct l2cap_ctrl *control)
1070{
1071 struct sk_buff *skb;
1072 u32 control_field;
1073
1074 BT_DBG("chan %p, control %p", chan, control);
1075
1076 if (!control->sframe)
1077 return;
1078
b99e13ad
MM		 1079 if (__chan_is_moving(chan))
1080 return;
1081
a67d7f6f
MM		 1082 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1083 !control->poll)
1084 control->final = 1;
1085
1086 if (control->super == L2CAP_SUPER_RR)
1087 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1088 else if (control->super == L2CAP_SUPER_RNR)
1089 set_bit(CONN_RNR_SENT, &chan->conn_state);
1090
1091 if (control->super != L2CAP_SUPER_SREJ) {
1092 chan->last_acked_seq = control->reqseq;
1093 __clear_ack_timer(chan);
1094 }
1095
1096 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1097 control->final, control->poll, control->super);
1098
1099 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1100 control_field = __pack_extended_control(control);
1101 else
1102 control_field = __pack_enhanced_control(control);
1103
1104 skb = l2cap_create_sframe_pdu(chan, control_field);
1105 if (!IS_ERR(skb))
1106 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1107}
1108
c9e3d5e0 1109static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1110{
c9e3d5e0
MM		 1111 struct l2cap_ctrl control;
1112
1113 BT_DBG("chan %p, poll %d", chan, poll);
1114
1115 memset(&control, 0, sizeof(control));
1116 control.sframe = 1;
1117 control.poll = poll;
1118
1119 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1120 control.super = L2CAP_SUPER_RNR;
1121 else
1122 control.super = L2CAP_SUPER_RR;
b5c6aaed 1123
c9e3d5e0
MM		 1124 control.reqseq = chan->buffer_seq;
1125 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1126}
1127
b4450035 1128static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1129{
5ff6f34d
JH		 1130 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
1131 return true;
1132
c1360a1c 1133 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1134}
1135
1df7b17a 1136static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1137{
1df7b17a 1138 struct l2cap_conn *conn = chan->conn;
80d58d0b 1139 struct hci_dev *hdev;
1df7b17a
MH		 1140 bool amp_available = false;
1141
0bd49fc7 1142 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
1df7b17a
MH		 1143 return false;
1144
0bd49fc7 1145 if (!(conn->remote_fixed_chan & L2CAP_FC_A2MP))
1df7b17a 1146 return false;
80d58d0b
MH		 1147
1148 read_lock(&hci_dev_list_lock);
1df7b17a 1149 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1150 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1151 test_bit(HCI_UP, &hdev->flags)) {
1152 amp_available = true;
1153 break;
1154 }
1155 }
80d58d0b
MH		 1156 read_unlock(&hci_dev_list_lock);
1157
1df7b17a
MH		 1158 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1159 return amp_available;
848566b3
MH		 1160
1161 return false;
93c3e8f5
AE		 1162}
1163
5ce66b59
AE		 1164static bool l2cap_check_efs(struct l2cap_chan *chan)
1165{
1166 /* Check EFS parameters */
1167 return true;
1168}
1169
2766be48 1170void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1171{
1172 struct l2cap_conn *conn = chan->conn;
1173 struct l2cap_conn_req req;
1174
1175 req.scid = cpu_to_le16(chan->scid);
1176 req.psm = chan->psm;
1177
1178 chan->ident = l2cap_get_ident(conn);
1179
1180 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1181
1182 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1183}
1184
8eb200bd
MM		 1185static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1186{
1187 struct l2cap_create_chan_req req;
1188 req.scid = cpu_to_le16(chan->scid);
1189 req.psm = chan->psm;
1190 req.amp_id = amp_id;
1191
1192 chan->ident = l2cap_get_ident(chan->conn);
1193
1194 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1195 sizeof(req), &req);
1196}
1197
02b0fbb9
MM		 1198static void l2cap_move_setup(struct l2cap_chan *chan)
1199{
1200 struct sk_buff *skb;
1201
1202 BT_DBG("chan %p", chan);
1203
1204 if (chan->mode != L2CAP_MODE_ERTM)
1205 return;
1206
1207 __clear_retrans_timer(chan);
1208 __clear_monitor_timer(chan);
1209 __clear_ack_timer(chan);
1210
1211 chan->retry_count = 0;
1212 skb_queue_walk(&chan->tx_q, skb) {
a4368ff3
JH		 1213 if (bt_cb(skb)->l2cap.retries)
1214 bt_cb(skb)->l2cap.retries = 1;
02b0fbb9
MM		 1215 else
1216 break;
1217 }
1218
1219 chan->expected_tx_seq = chan->buffer_seq;
1220
1221 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1222 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1223 l2cap_seq_list_clear(&chan->retrans_list);
1224 l2cap_seq_list_clear(&chan->srej_list);
1225 skb_queue_purge(&chan->srej_q);
1226
1227 chan->tx_state = L2CAP_TX_STATE_XMIT;
1228 chan->rx_state = L2CAP_RX_STATE_MOVE;
1229
1230 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1231}
1232
5f3847a4
MM		 1233static void l2cap_move_done(struct l2cap_chan *chan)
1234{
1235 u8 move_role = chan->move_role;
1236 BT_DBG("chan %p", chan);
1237
1238 chan->move_state = L2CAP_MOVE_STABLE;
1239 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1240
1241 if (chan->mode != L2CAP_MODE_ERTM)
1242 return;
1243
1244 switch (move_role) {
1245 case L2CAP_MOVE_ROLE_INITIATOR:
1246 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1247 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1248 break;
1249 case L2CAP_MOVE_ROLE_RESPONDER:
1250 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1251 break;
1252 }
1253}
1254
9f0caeb1
VCG		 1255static void l2cap_chan_ready(struct l2cap_chan *chan)
1256{
315917e0
JH		 1257 /* The channel may have already been flagged as connected in
1258 * case of receiving data before the L2CAP info req/rsp
1259 * procedure is complete.
1260 */
1261 if (chan->state == BT_CONNECTED)
1262 return;
1263
2827011f 1264 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1265 chan->conf_state = 0;
1266 __clear_chan_timer(chan);
1267
0ce43ce6
JH		 1268 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1269 chan->ops->suspend(chan);
177f8f2b 1270
54a59aa2 1271 chan->state = BT_CONNECTED;
9f0caeb1 1272
fd83e2c2 1273 chan->ops->ready(chan);
9f0caeb1
VCG		 1274}
1275
f1496dee
JH		 1276static void l2cap_le_connect(struct l2cap_chan *chan)
1277{
1278 struct l2cap_conn *conn = chan->conn;
1279 struct l2cap_le_conn_req req;
1280
595177f3
JH		 1281 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1282 return;
1283
f1496dee
JH		 1284 req.psm = chan->psm;
1285 req.scid = cpu_to_le16(chan->scid);
1286 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1287 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1288 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1289
1290 chan->ident = l2cap_get_ident(conn);
1291
1292 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1293 sizeof(req), &req);
1294}
1295
1296static void l2cap_le_start(struct l2cap_chan *chan)
1297{
1298 struct l2cap_conn *conn = chan->conn;
1299
1300 if (!smp_conn_security(conn->hcon, chan->sec_level))
1301 return;
1302
1303 if (!chan->psm) {
1304 l2cap_chan_ready(chan);
1305 return;
1306 }
1307
1308 if (chan->state == BT_CONNECT)
1309 l2cap_le_connect(chan);
1310}
1311
93c3e8f5
AE		 1312static void l2cap_start_connection(struct l2cap_chan *chan)
1313{
1314 if (__amp_capable(chan)) {
1315 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1316 a2mp_discover_amp(chan);
f1496dee
JH		 1317 } else if (chan->conn->hcon->type == LE_LINK) {
1318 l2cap_le_start(chan);
93c3e8f5
AE		 1319 } else {
1320 l2cap_send_conn_req(chan);
1321 }
1322}
1323
aeaeb4bb
JH		 1324static void l2cap_request_info(struct l2cap_conn *conn)
1325{
1326 struct l2cap_info_req req;
1327
1328 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1329 return;
1330
1331 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1332
1333 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1334 conn->info_ident = l2cap_get_ident(conn);
1335
1336 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1337
1338 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1339 sizeof(req), &req);
1340}
1341
fc7f8a7e 1342static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1343{
8c1d787b 1344 struct l2cap_conn *conn = chan->conn;
79d554a6 1345
9f0caeb1 1346 if (conn->hcon->type == LE_LINK) {
96ac34fb 1347 l2cap_le_start(chan);
9f0caeb1
VCG		 1348 return;
1349 }
1350
aeaeb4bb
JH		 1351 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) {
1352 l2cap_request_info(conn);
1353 return;
1354 }
79d554a6 1355
aeaeb4bb
JH		 1356 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1357 return;
79d554a6 1358
aeaeb4bb
JH		 1359 if (l2cap_chan_check_security(chan, true) &&
1360 __l2cap_no_conn_pending(chan))
1361 l2cap_start_connection(chan);
79d554a6
MH		 1362}
1363
cf6c2c0b
GP		 1364static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1365{
1366 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1367 if (!disable_ertm)
cf6c2c0b
GP		 1368 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1369
1370 switch (mode) {
1371 case L2CAP_MODE_ERTM:
1372 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1373 case L2CAP_MODE_STREAMING:
1374 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1375 default:
1376 return 0x00;
1377 }
1378}
1379
5e4e3972 1380static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1381{
5e4e3972 1382 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1383 struct l2cap_disconn_req req;
1384
c13ffa62
GP		 1385 if (!conn)
1386 return;
1387
aad3d0e3 1388 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1389 __clear_retrans_timer(chan);
1390 __clear_monitor_timer(chan);
1391 __clear_ack_timer(chan);
c13ffa62
GP		 1392 }
1393
2338a7e0 1394 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1395 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1396 return;
1397 }
1398
fe4128e0
GP		 1399 req.dcid = cpu_to_le16(chan->dcid);
1400 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1401 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1402 sizeof(req), &req);
c13ffa62 1403
f8e73017 1404 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1405}
1406
1da177e4 1407/* ---- L2CAP connections ---- */
4e8402a3
MH		 1408static void l2cap_conn_start(struct l2cap_conn *conn)
1409{
3df91ea2 1410 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1411
1412 BT_DBG("conn %p", conn);
1413
3df91ea2 1414 mutex_lock(&conn->chan_lock);
4e8402a3 1415
3df91ea2 1416 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1417 l2cap_chan_lock(chan);
4e8402a3 1418
715ec005 1419 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb 1420 l2cap_chan_ready(chan);
6be36555 1421 l2cap_chan_unlock(chan);
79d554a6
MH		 1422 continue;
1423 }
1424
89bc500e 1425 if (chan->state == BT_CONNECT) {
e7cafc45 1426 if (!l2cap_chan_check_security(chan, true) ||
2d792818 1427 !__l2cap_no_conn_pending(chan)) {
6be36555 1428 l2cap_chan_unlock(chan);
47731de7
GP		 1429 continue;
1430 }
79d554a6 1431
c1360a1c 1432 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1433 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1434 &chan->conf_state)) {
89bc500e 1435 l2cap_chan_close(chan, ECONNRESET);
6be36555 1436 l2cap_chan_unlock(chan);
47731de7 1437 continue;
b1235d79 1438 }
47731de7 1439
93c3e8f5 1440 l2cap_start_connection(chan);
47731de7 1441
89bc500e 1442 } else if (chan->state == BT_CONNECT2) {
79d554a6 1443 struct l2cap_conn_rsp rsp;
e9aeb2dd 1444 char buf[128];
fe4128e0
GP		 1445 rsp.scid = cpu_to_le16(chan->dcid);
1446 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1447
e7cafc45 1448 if (l2cap_chan_check_security(chan, false)) {
bdc25783 1449 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
dcf4adbf
JP		 1450 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1451 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1452 chan->ops->defer(chan);
f66dc81f
MH		 1453
1454 } else {
acdcabf5 1455 l2cap_state_change(chan, BT_CONFIG);
dcf4adbf
JP		 1456 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1457 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1458 }
79d554a6 1459 } else {
dcf4adbf
JP		 1460 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1461 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1462 }
1463
fc7f8a7e 1464 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1465 sizeof(rsp), &rsp);
e9aeb2dd 1466
c1360a1c 1467 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1468 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1469 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1470 continue;
1471 }
1472
c1360a1c 1473 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1474 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1475 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1476 chan->num_conf_req++;
4e8402a3
MH		 1477 }
1478
6be36555 1479 l2cap_chan_unlock(chan);
4e8402a3
MH		 1480 }
1481
3df91ea2 1482 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1483}
1484
b62f328b
VT		 1485static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1486{
cc8dba2b 1487 struct hci_conn *hcon = conn->hcon;
dcc36c16 1488 struct hci_dev *hdev = hcon->hdev;
b62f328b 1489
e760ec12 1490 BT_DBG("%s conn %p", hdev->name, conn);
b62f328b 1491
e760ec12
JH		 1492 /* For outgoing pairing which doesn't necessarily have an
1493 * associated socket (e.g. mgmt_pair_device).
1494 */
1495 if (hcon->out)
1496 smp_conn_security(hcon, hcon->pending_sec_level);
cc8dba2b 1497
80afeb6c
MH		 1498 /* For LE slave connections, make sure the connection interval
1499 * is in the range of the minium and maximum interval that has
1500 * been configured for this connection. If not, then trigger
1501 * the connection update procedure.
1502 */
40bef302 1503 if (hcon->role == HCI_ROLE_SLAVE &&
80afeb6c
MH		 1504 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1505 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1506 struct l2cap_conn_param_update_req req;
1507
1508 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1509 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1510 req.latency = cpu_to_le16(hcon->le_conn_latency);
1511 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1512
1513 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1514 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1515 }
b62f328b
VT		 1516}
1517
4e8402a3
MH		 1518static void l2cap_conn_ready(struct l2cap_conn *conn)
1519{
48454079 1520 struct l2cap_chan *chan;
cc110922 1521 struct hci_conn *hcon = conn->hcon;
4e8402a3 1522
79d554a6 1523 BT_DBG("conn %p", conn);
4e8402a3 1524
aeaeb4bb
JH		 1525 if (hcon->type == ACL_LINK)
1526 l2cap_request_info(conn);
1527
e760ec12
JH		 1528 mutex_lock(&conn->chan_lock);
1529
3df91ea2 1530 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1531
6be36555 1532 l2cap_chan_lock(chan);
4e8402a3 1533
2338a7e0 1534 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1535 l2cap_chan_unlock(chan);
1536 continue;
1537 }
1538
cc110922 1539 if (hcon->type == LE_LINK) {
f1496dee 1540 l2cap_le_start(chan);
63128451 1541 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb
JH		 1542 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
1543 l2cap_chan_ready(chan);
1c244f79 1544 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1545 l2cap_do_start(chan);
1c244f79 1546 }
4e8402a3 1547
6be36555 1548 l2cap_chan_unlock(chan);
4e8402a3 1549 }
79d554a6 1550
3df91ea2 1551 mutex_unlock(&conn->chan_lock);
61a939c6 1552
79a05727
JH		 1553 if (hcon->type == LE_LINK)
1554 l2cap_le_conn_ready(conn);
1555
61a939c6 1556 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1557}
1558
1559/* Notify sockets that we cannot guaranty reliability anymore */
1560static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1561{
48454079 1562 struct l2cap_chan *chan;
4e8402a3
MH		 1563
1564 BT_DBG("conn %p", conn);
1565
3df91ea2 1566 mutex_lock(&conn->chan_lock);
4e8402a3 1567
3df91ea2 1568 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1569 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1570 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1571 }
1572
3df91ea2 1573 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1574}
1575
f878fcad 1576static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1577{
f878fcad 1578 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1579 info_timer.work);
4e8402a3 1580
984947dc 1581 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1582 conn->info_ident = 0;
984947dc 1583
4e8402a3
MH		 1584 l2cap_conn_start(conn);
1585}
1586
2c8e1411
DH		 1587/*
1588 * l2cap_user
1589 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1590 * callback is called during registration. The ->remove callback is called
1591 * during unregistration.
1592 * An l2cap_user object can either be explicitly unregistered or when the
1593 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1594 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1595 * External modules must own a reference to the l2cap_conn object if they intend
1596 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1597 * any time if they don't.
1598 */
1599
1600int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1601{
1602 struct hci_dev *hdev = conn->hcon->hdev;
1603 int ret;
1604
1605 /* We need to check whether l2cap_conn is registered. If it is not, we
1606 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1607 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1608 * relies on the parent hci_conn object to be locked. This itself relies
1609 * on the hci_dev object to be locked. So we must lock the hci device
1610 * here, too. */
1611
1612 hci_dev_lock(hdev);
1613
835a6a2f 1614 if (!list_empty(&user->list)) {
2c8e1411
DH		 1615 ret = -EINVAL;
1616 goto out_unlock;
1617 }
1618
1619 /* conn->hchan is NULL after l2cap_conn_del() was called */
1620 if (!conn->hchan) {
1621 ret = -ENODEV;
1622 goto out_unlock;
1623 }
1624
1625 ret = user->probe(conn, user);
1626 if (ret)
1627 goto out_unlock;
1628
1629 list_add(&user->list, &conn->users);
1630 ret = 0;
1631
1632out_unlock:
1633 hci_dev_unlock(hdev);
1634 return ret;
1635}
1636EXPORT_SYMBOL(l2cap_register_user);
1637
1638void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1639{
1640 struct hci_dev *hdev = conn->hcon->hdev;
1641
1642 hci_dev_lock(hdev);
1643
835a6a2f 1644 if (list_empty(&user->list))
2c8e1411
DH		 1645 goto out_unlock;
1646
ab944c83 1647 list_del_init(&user->list);
2c8e1411
DH		 1648 user->remove(conn, user);
1649
1650out_unlock:
1651 hci_dev_unlock(hdev);
1652}
1653EXPORT_SYMBOL(l2cap_unregister_user);
1654
1655static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1656{
1657 struct l2cap_user *user;
1658
1659 while (!list_empty(&conn->users)) {
1660 user = list_first_entry(&conn->users, struct l2cap_user, list);
ab944c83 1661 list_del_init(&user->list);
2c8e1411
DH		 1662 user->remove(conn, user);
1663 }
1664}
1665
5d3de7df
VCG		 1666static void l2cap_conn_del(struct hci_conn *hcon, int err)
1667{
1668 struct l2cap_conn *conn = hcon->l2cap_data;
1669 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1670
1671 if (!conn)
1672 return;
1673
1674 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1675
1676 kfree_skb(conn->rx_skb);
1677
61a939c6 1678 skb_queue_purge(&conn->pending_rx);
7ab56c3a
JT		 1679
1680 /* We can not call flush_work(&conn->pending_rx_work) here since we
1681 * might block if we are running on a worker from the same workqueue
1682 * pending_rx_work is waiting on.
1683 */
1684 if (work_pending(&conn->pending_rx_work))
1685 cancel_work_sync(&conn->pending_rx_work);
61a939c6 1686
f3d82d0c
JH		 1687 if (work_pending(&conn->id_addr_update_work))
1688 cancel_work_sync(&conn->id_addr_update_work);
1689
2c8e1411
DH		 1690 l2cap_unregister_all_users(conn);
1691
e31fb860
JH		 1692 /* Force the connection to be immediately dropped */
1693 hcon->disc_timeout = 0;
1694
3df91ea2
AE		 1695 mutex_lock(&conn->chan_lock);
1696
5d3de7df
VCG		 1697 /* Kill channels */
1698 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1699 l2cap_chan_hold(chan);
6be36555
AE		 1700 l2cap_chan_lock(chan);
1701
5d3de7df 1702 l2cap_chan_del(chan, err);
6be36555
AE		 1703
1704 l2cap_chan_unlock(chan);
1705
80b98027 1706 chan->ops->close(chan);
61d6ef3e 1707 l2cap_chan_put(chan);
5d3de7df
VCG		 1708 }
1709
3df91ea2
AE		 1710 mutex_unlock(&conn->chan_lock);
1711
73d80deb
LAD		 1712 hci_chan_del(conn->hchan);
1713
5d3de7df 1714 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1715 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1716
5d3de7df 1717 hcon->l2cap_data = NULL;
9c903e37
DH		 1718 conn->hchan = NULL;
1719 l2cap_conn_put(conn);
5d3de7df
VCG		 1720}
1721
9c903e37
DH		 1722static void l2cap_conn_free(struct kref *ref)
1723{
1724 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1725
1726 hci_conn_put(conn->hcon);
1727 kfree(conn);
1728}
1729
51bb8457 1730struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
9c903e37
DH		 1731{
1732 kref_get(&conn->ref);
51bb8457 1733 return conn;
9c903e37
DH		 1734}
1735EXPORT_SYMBOL(l2cap_conn_get);
1736
1737void l2cap_conn_put(struct l2cap_conn *conn)
1738{
1739 kref_put(&conn->ref, l2cap_conn_free);
1740}
1741EXPORT_SYMBOL(l2cap_conn_put);
1742
1da177e4 1743/* ---- Socket interface ---- */
1da177e4 1744
c2287681 1745/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1746 * Returns closest match.
1747 */
c2287681
IY		 1748static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1749 bdaddr_t *src,
bf20fd4e
JH		 1750 bdaddr_t *dst,
1751 u8 link_type)
1da177e4 1752{
23691d75 1753 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1754
23691d75 1755 read_lock(&chan_list_lock);
e0f0cb56 1756
23691d75 1757 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1758 if (state && c->state != state)
1da177e4
LT		 1759 continue;
1760
bf20fd4e
JH		 1761 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1762 continue;
1763
1764 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1765 continue;
1766
23691d75 1767 if (c->psm == psm) {
c2287681
IY		 1768 int src_match, dst_match;
1769 int src_any, dst_any;
1770
1da177e4 1771 /* Exact match. */
7eafc59e
MH		 1772 src_match = !bacmp(&c->src, src);
1773 dst_match = !bacmp(&c->dst, dst);
c2287681 1774 if (src_match && dst_match) {
a24cce14 1775 l2cap_chan_hold(c);
a7567b20 1776 read_unlock(&chan_list_lock);
23691d75
GP		 1777 return c;
1778 }
1da177e4
LT		 1779
1780 /* Closest match */
7eafc59e
MH		 1781 src_any = !bacmp(&c->src, BDADDR_ANY);
1782 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1783 if ((src_match && dst_any) || (src_any && dst_match) ||
1784 (src_any && dst_any))
23691d75 1785 c1 = c;
1da177e4
LT		 1786 }
1787 }
1da177e4 1788
a24cce14
JH		 1789 if (c1)
1790 l2cap_chan_hold(c1);
1791
23691d75 1792 read_unlock(&chan_list_lock);
e0f0cb56 1793
23691d75 1794 return c1;
1da177e4
LT		 1795}
1796
721c4181 1797static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1798{
721c4181 1799 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1800 monitor_timer.work);
e90bac06 1801
525cd185 1802 BT_DBG("chan %p", chan);
0e98958d 1803
6be36555
AE		 1804 l2cap_chan_lock(chan);
1805
80909e04 1806 if (!chan->conn) {
6be36555 1807 l2cap_chan_unlock(chan);
8d7e1c7f 1808 l2cap_chan_put(chan);
e90bac06
GP		 1809 return;
1810 }
1811
401bb1f7 1812 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1813
6be36555 1814 l2cap_chan_unlock(chan);
8d7e1c7f 1815 l2cap_chan_put(chan);
e90bac06
GP		 1816}
1817
721c4181 1818static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1819{
721c4181 1820 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1821 retrans_timer.work);
e90bac06 1822
49208c9c 1823 BT_DBG("chan %p", chan);
0e98958d 1824
6be36555
AE		 1825 l2cap_chan_lock(chan);
1826
80909e04
MM		 1827 if (!chan->conn) {
1828 l2cap_chan_unlock(chan);
1829 l2cap_chan_put(chan);
1830 return;
1831 }
6be36555 1832
401bb1f7 1833 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1834 l2cap_chan_unlock(chan);
8d7e1c7f 1835 l2cap_chan_put(chan);
e90bac06
GP		 1836}
1837
d660366d
GP		 1838static void l2cap_streaming_send(struct l2cap_chan *chan,
1839 struct sk_buff_head *skbs)
6840ed07 1840{
ccbb84af 1841 struct sk_buff *skb;
3733937d 1842 struct l2cap_ctrl *control;
6840ed07 1843
3733937d
MM		 1844 BT_DBG("chan %p, skbs %p", chan, skbs);
1845
b99e13ad
MM		 1846 if (__chan_is_moving(chan))
1847 return;
1848
3733937d
MM		 1849 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1850
1851 while (!skb_queue_empty(&chan->tx_q)) {
1852
1853 skb = skb_dequeue(&chan->tx_q);
1854
a4368ff3
JH		 1855 bt_cb(skb)->l2cap.retries = 1;
1856 control = &bt_cb(skb)->l2cap;
3733937d
MM		 1857
1858 control->reqseq = 0;
1859 control->txseq = chan->next_tx_seq;
1860
1861 __pack_control(chan, control, skb);
6840ed07 1862
47d1ec61 1863 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1864 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1865 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1866 }
1867
4343478f 1868 l2cap_do_send(chan, skb);
6840ed07 1869
b4400672 1870 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1871
836be934 1872 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1873 chan->frames_sent++;
6840ed07 1874 }
6840ed07
GP		 1875}
1876
67c9e840 1877static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1878{
1879 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1880 struct l2cap_ctrl *control;
1881 int sent = 0;
1882
1883 BT_DBG("chan %p", chan);
1c2acffb 1884
89bc500e 1885 if (chan->state != BT_CONNECTED)
c13ffa62 1886 return -ENOTCONN;
e90bac06 1887
94122bbe
MM		 1888 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1889 return 0;
1890
b99e13ad
MM		 1891 if (__chan_is_moving(chan))
1892 return 0;
1893
18a48e76
MM		 1894 while (chan->tx_send_head &&
1895 chan->unacked_frames < chan->remote_tx_win &&
1896 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1897
18a48e76 1898 skb = chan->tx_send_head;
e90bac06 1899
a4368ff3
JH		 1900 bt_cb(skb)->l2cap.retries = 1;
1901 control = &bt_cb(skb)->l2cap;
95ffa978 1902
e2ab4353 1903 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1904 control->final = 1;
e2ab4353 1905
18a48e76
MM		 1906 control->reqseq = chan->buffer_seq;
1907 chan->last_acked_seq = chan->buffer_seq;
1908 control->txseq = chan->next_tx_seq;
1c2acffb 1909
18a48e76 1910 __pack_control(chan, control, skb);
e90bac06 1911
47d1ec61 1912 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1913 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1914 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1915 }
1916
18a48e76
MM		 1917 /* Clone after data has been modified. Data is assumed to be
1918 read-only (for locking purposes) on cloned sk_buffs.
1919 */
1920 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1921
18a48e76
MM		 1922 if (!tx_skb)
1923 break;
1c2acffb 1924
18a48e76 1925 __set_retrans_timer(chan);
836be934
AE		 1926
1927 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1928 chan->unacked_frames++;
6a026610 1929 chan->frames_sent++;
18a48e76 1930 sent++;
1c2acffb 1931
58d35f87
GP		 1932 if (skb_queue_is_last(&chan->tx_q, skb))
1933 chan->tx_send_head = NULL;
1c2acffb 1934 else
58d35f87 1935 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1936
1937 l2cap_do_send(chan, tx_skb);
b4400672 1938 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1939 }
1940
b4400672
AE		 1941 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1942 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1943
1944 return sent;
9e917af1
GP		 1945}
1946
e1fbd4c1
MM		 1947static void l2cap_ertm_resend(struct l2cap_chan *chan)
1948{
1949 struct l2cap_ctrl control;
1950 struct sk_buff *skb;
1951 struct sk_buff *tx_skb;
1952 u16 seq;
1953
1954 BT_DBG("chan %p", chan);
1955
1956 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1957 return;
1958
b99e13ad
MM		 1959 if (__chan_is_moving(chan))
1960 return;
1961
e1fbd4c1
MM		 1962 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1963 seq = l2cap_seq_list_pop(&chan->retrans_list);
1964
1965 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1966 if (!skb) {
1967 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1968 seq);
e1fbd4c1
MM		 1969 continue;
1970 }
1971
a4368ff3
JH		 1972 bt_cb(skb)->l2cap.retries++;
1973 control = bt_cb(skb)->l2cap;
e1fbd4c1
MM		 1974
1975 if (chan->max_tx != 0 &&
a4368ff3 1976 bt_cb(skb)->l2cap.retries > chan->max_tx) {
e1fbd4c1 1977 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1978 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1979 l2cap_seq_list_clear(&chan->retrans_list);
1980 break;
1981 }
1982
1983 control.reqseq = chan->buffer_seq;
1984 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1985 control.final = 1;
1986 else
1987 control.final = 0;
1988
1989 if (skb_cloned(skb)) {
1990 /* Cloned sk_buffs are read-only, so we need a
1991 * writeable copy
1992 */
8bcde1f2 1993 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1994 } else {
8bcde1f2 1995 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1996 }
1997
1998 if (!tx_skb) {
1999 l2cap_seq_list_clear(&chan->retrans_list);
2000 break;
2001 }
2002
2003 /* Update skb contents */
2004 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2005 put_unaligned_le32(__pack_extended_control(&control),
2006 tx_skb->data + L2CAP_HDR_SIZE);
2007 } else {
2008 put_unaligned_le16(__pack_enhanced_control(&control),
2009 tx_skb->data + L2CAP_HDR_SIZE);
2010 }
2011
13cac152 2012 /* Update FCS */
e1fbd4c1 2013 if (chan->fcs == L2CAP_FCS_CRC16) {
13cac152
LR		 2014 u16 fcs = crc16(0, (u8 *) tx_skb->data,
2015 tx_skb->len - L2CAP_FCS_SIZE);
2016 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
2017 L2CAP_FCS_SIZE);
e1fbd4c1
MM		 2018 }
2019
2020 l2cap_do_send(chan, tx_skb);
2021
2022 BT_DBG("Resent txseq %d", control.txseq);
2023
2024 chan->last_acked_seq = chan->buffer_seq;
2025 }
2026}
2027
f80842a8
MM		 2028static void l2cap_retransmit(struct l2cap_chan *chan,
2029 struct l2cap_ctrl *control)
2030{
2031 BT_DBG("chan %p, control %p", chan, control);
2032
2033 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2034 l2cap_ertm_resend(chan);
2035}
2036
d2a7ac5d
MM		 2037static void l2cap_retransmit_all(struct l2cap_chan *chan,
2038 struct l2cap_ctrl *control)
2039{
e1fbd4c1
MM		 2040 struct sk_buff *skb;
2041
2042 BT_DBG("chan %p, control %p", chan, control);
2043
2044 if (control->poll)
2045 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2046
2047 l2cap_seq_list_clear(&chan->retrans_list);
2048
2049 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2050 return;
2051
2052 if (chan->unacked_frames) {
2053 skb_queue_walk(&chan->tx_q, skb) {
a4368ff3 2054 if (bt_cb(skb)->l2cap.txseq == control->reqseq ||
2d792818 2055 skb == chan->tx_send_head)
e1fbd4c1
MM		 2056 break;
2057 }
2058
2059 skb_queue_walk_from(&chan->tx_q, skb) {
2060 if (skb == chan->tx_send_head)
2061 break;
2062
2063 l2cap_seq_list_append(&chan->retrans_list,
a4368ff3 2064 bt_cb(skb)->l2cap.txseq);
e1fbd4c1
MM		 2065 }
2066
2067 l2cap_ertm_resend(chan);
2068 }
d2a7ac5d
MM		 2069}
2070
0a0aba42 2071static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2072{
0a0aba42
MM		 2073 struct l2cap_ctrl control;
2074 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2075 chan->last_acked_seq);
2076 int threshold;
9e917af1 2077
0a0aba42
MM		 2078 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2079 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2080
0a0aba42
MM		 2081 memset(&control, 0, sizeof(control));
2082 control.sframe = 1;
dfc909be 2083
0a0aba42
MM		 2084 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2085 chan->rx_state == L2CAP_RX_STATE_RECV) {
2086 __clear_ack_timer(chan);
2087 control.super = L2CAP_SUPER_RNR;
2088 control.reqseq = chan->buffer_seq;
2089 l2cap_send_sframe(chan, &control);
2090 } else {
2091 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2092 l2cap_ertm_send(chan);
2093 /* If any i-frames were sent, they included an ack */
2094 if (chan->buffer_seq == chan->last_acked_seq)
2095 frames_to_ack = 0;
2096 }
dfc909be 2097
c20f8e35 2098 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2099 * Calculate without mul or div
2100 */
c20f8e35 2101 threshold = chan->ack_win;
0a0aba42
MM		 2102 threshold += threshold << 1;
2103 threshold >>= 2;
2104
b4400672 2105 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2106 threshold);
2107
2108 if (frames_to_ack >= threshold) {
2109 __clear_ack_timer(chan);
2110 control.super = L2CAP_SUPER_RR;
2111 control.reqseq = chan->buffer_seq;
2112 l2cap_send_sframe(chan, &control);
2113 frames_to_ack = 0;
2114 }
1c2acffb 2115
0a0aba42
MM		 2116 if (frames_to_ack)
2117 __set_ack_timer(chan);
2118 }
b17e73bb
SJ		 2119}
2120
04124681
GP		 2121static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2122 struct msghdr *msg, int len,
2123 int count, struct sk_buff *skb)
1c2acffb 2124{
0952a57a 2125 struct l2cap_conn *conn = chan->conn;
1c2acffb 2126 struct sk_buff **frag;
90338947 2127 int sent = 0;
1da177e4 2128
17836394 2129 if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count)
1c2acffb 2130 return -EFAULT;
1da177e4
LT		 2131
2132 sent += count;
2133 len -= count;
2134
2135 /* Continuation fragments (no L2CAP header) */
2136 frag = &skb_shinfo(skb)->frag_list;
2137 while (len) {
fbe00700
GP		 2138 struct sk_buff *tmp;
2139
1da177e4
LT		 2140 count = min_t(unsigned int, conn->mtu, len);
2141
d9fbd02b 2142 tmp = chan->ops->alloc_skb(chan, 0, count,
fbe00700
GP		 2143 msg->msg_flags & MSG_DONTWAIT);
2144 if (IS_ERR(tmp))
2145 return PTR_ERR(tmp);
2146
2147 *frag = tmp;
2f7719ce 2148
17836394
AV		 2149 if (copy_from_iter(skb_put(*frag, count), count,
2150 &msg->msg_iter) != count)
1c2acffb 2151 return -EFAULT;
1da177e4
LT		 2152
2153 sent += count;
2154 len -= count;
2155
2d0ed3d5
GP		 2156 skb->len += (*frag)->len;
2157 skb->data_len += (*frag)->len;
2158
1da177e4
LT		 2159 frag = &(*frag)->next;
2160 }
1da177e4
LT		 2161
2162 return sent;
1c2acffb 2163}
1da177e4 2164
5e59b791 2165static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
8d46321c 2166 struct msghdr *msg, size_t len)
1c2acffb 2167{
8c1d787b 2168 struct l2cap_conn *conn = chan->conn;
1c2acffb 2169 struct sk_buff *skb;
03a51213 2170 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2171 struct l2cap_hdr *lh;
2172
8d46321c
MH		 2173 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2174 __le16_to_cpu(chan->psm), len);
1c2acffb
GP		 2175
2176 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2177
d9fbd02b 2178 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2179 msg->msg_flags & MSG_DONTWAIT);
2180 if (IS_ERR(skb))
2181 return skb;
1c2acffb
GP		 2182
2183 /* Create L2CAP header */
2184 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2185 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2186 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2187 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2188
0952a57a 2189 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2190 if (unlikely(err < 0)) {
2191 kfree_skb(skb);
2192 return ERR_PTR(err);
2193 }
2194 return skb;
2195}
2196
5e59b791 2197static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
8d46321c 2198 struct msghdr *msg, size_t len)
1c2acffb 2199{
8c1d787b 2200 struct l2cap_conn *conn = chan->conn;
1c2acffb 2201 struct sk_buff *skb;
f2ba7fae 2202 int err, count;
1c2acffb
GP		 2203 struct l2cap_hdr *lh;
2204
b4400672 2205 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2206
f2ba7fae 2207 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2208
d9fbd02b 2209 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
90338947
GP		 2210 msg->msg_flags & MSG_DONTWAIT);
2211 if (IS_ERR(skb))
2212 return skb;
1c2acffb
GP		 2213
2214 /* Create L2CAP header */
2215 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2216 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2217 lh->len = cpu_to_le16(len);
1c2acffb 2218
0952a57a 2219 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2220 if (unlikely(err < 0)) {
2221 kfree_skb(skb);
2222 return ERR_PTR(err);
2223 }
2224 return skb;
2225}
2226
ab0ff76d 2227static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2228 struct msghdr *msg, size_t len,
2229 u16 sdulen)
1c2acffb 2230{
8c1d787b 2231 struct l2cap_conn *conn = chan->conn;
1c2acffb 2232 struct sk_buff *skb;
e4ca6d98 2233 int err, count, hlen;
1c2acffb
GP		 2234 struct l2cap_hdr *lh;
2235
b4400672 2236 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2237
0ee0d208
GP		 2238 if (!conn)
2239 return ERR_PTR(-ENOTCONN);
2240
ba7aa64f 2241 hlen = __ertm_hdr_size(chan);
e4ca6d98 2242
c74e560c 2243 if (sdulen)
03a51213 2244 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2245
47d1ec61 2246 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2247 hlen += L2CAP_FCS_SIZE;
fcc203c3 2248
1c2acffb 2249 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2250
d9fbd02b 2251 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2252 msg->msg_flags & MSG_DONTWAIT);
2253 if (IS_ERR(skb))
2254 return skb;
1c2acffb
GP		 2255
2256 /* Create L2CAP header */
2257 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2258 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2259 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2260
18a48e76
MM		 2261 /* Control header is populated later */
2262 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2263 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2264 else
2265 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2266
c74e560c 2267 if (sdulen)
03a51213 2268 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2269
0952a57a 2270 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2271 if (unlikely(err < 0)) {
2272 kfree_skb(skb);
2273 return ERR_PTR(err);
2274 }
e90bac06 2275
a4368ff3
JH		 2276 bt_cb(skb)->l2cap.fcs = chan->fcs;
2277 bt_cb(skb)->l2cap.retries = 0;
1c2acffb 2278 return skb;
1da177e4
LT		 2279}
2280
94122bbe
MM		 2281static int l2cap_segment_sdu(struct l2cap_chan *chan,
2282 struct sk_buff_head *seg_queue,
2283 struct msghdr *msg, size_t len)
c74e560c 2284{
c74e560c 2285 struct sk_buff *skb;
94122bbe
MM		 2286 u16 sdu_len;
2287 size_t pdu_len;
94122bbe 2288 u8 sar;
c74e560c 2289
b4400672 2290 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2291
94122bbe
MM		 2292 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2293 * so fragmented skbs are not used. The HCI layer's handling
2294 * of fragmented skbs is not compatible with ERTM's queueing.
2295 */
c74e560c 2296
94122bbe
MM		 2297 /* PDU size is derived from the HCI MTU */
2298 pdu_len = chan->conn->mtu;
c74e560c 2299
a549574d
MM		 2300 /* Constrain PDU size for BR/EDR connections */
2301 if (!chan->hs_hcon)
2302 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2303
2304 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2305 if (chan->fcs)
2306 pdu_len -= L2CAP_FCS_SIZE;
2307
ba7aa64f 2308 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2309
2310 /* Remote device may have requested smaller PDUs */
2311 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2312
2313 if (len <= pdu_len) {
2314 sar = L2CAP_SAR_UNSEGMENTED;
2315 sdu_len = 0;
2316 pdu_len = len;
2317 } else {
2318 sar = L2CAP_SAR_START;
2319 sdu_len = len;
94122bbe
MM		 2320 }
2321
2322 while (len > 0) {
2323 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2324
c74e560c 2325 if (IS_ERR(skb)) {
94122bbe 2326 __skb_queue_purge(seg_queue);
c74e560c
GP		 2327 return PTR_ERR(skb);
2328 }
2329
a4368ff3 2330 bt_cb(skb)->l2cap.sar = sar;
94122bbe
MM		 2331 __skb_queue_tail(seg_queue, skb);
2332
2333 len -= pdu_len;
069cb270 2334 if (sdu_len)
94122bbe 2335 sdu_len = 0;
94122bbe
MM		 2336
2337 if (len <= pdu_len) {
2338 sar = L2CAP_SAR_END;
2339 pdu_len = len;
2340 } else {
2341 sar = L2CAP_SAR_CONTINUE;
2342 }
c74e560c 2343 }
c74e560c 2344
f0f62799 2345 return 0;
c74e560c
GP		 2346}
2347
177f8f2b
JH		 2348static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2349 struct msghdr *msg,
2350 size_t len, u16 sdulen)
2351{
2352 struct l2cap_conn *conn = chan->conn;
2353 struct sk_buff *skb;
2354 int err, count, hlen;
2355 struct l2cap_hdr *lh;
2356
2357 BT_DBG("chan %p len %zu", chan, len);
2358
2359 if (!conn)
2360 return ERR_PTR(-ENOTCONN);
2361
2362 hlen = L2CAP_HDR_SIZE;
2363
2364 if (sdulen)
2365 hlen += L2CAP_SDULEN_SIZE;
2366
2367 count = min_t(unsigned int, (conn->mtu - hlen), len);
2368
d9fbd02b 2369 skb = chan->ops->alloc_skb(chan, hlen, count,
177f8f2b
JH		 2370 msg->msg_flags & MSG_DONTWAIT);
2371 if (IS_ERR(skb))
2372 return skb;
2373
2374 /* Create L2CAP header */
2375 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2376 lh->cid = cpu_to_le16(chan->dcid);
2377 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2378
2379 if (sdulen)
2380 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2381
2382 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2383 if (unlikely(err < 0)) {
2384 kfree_skb(skb);
2385 return ERR_PTR(err);
2386 }
2387
2388 return skb;
2389}
2390
2391static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2392 struct sk_buff_head *seg_queue,
2393 struct msghdr *msg, size_t len)
2394{
2395 struct sk_buff *skb;
2396 size_t pdu_len;
2397 u16 sdu_len;
2398
2399 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2400
177f8f2b 2401 sdu_len = len;
72c6fb91 2402 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
177f8f2b
JH		 2403
2404 while (len > 0) {
2405 if (len <= pdu_len)
2406 pdu_len = len;
2407
2408 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2409 if (IS_ERR(skb)) {
2410 __skb_queue_purge(seg_queue);
2411 return PTR_ERR(skb);
2412 }
2413
2414 __skb_queue_tail(seg_queue, skb);
2415
2416 len -= pdu_len;
2417
2418 if (sdu_len) {
2419 sdu_len = 0;
2420 pdu_len += L2CAP_SDULEN_SIZE;
2421 }
2422 }
2423
2424 return 0;
2425}
2426
8d46321c 2427int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
9a91a04a 2428{
9a91a04a 2429 struct sk_buff *skb;
9a91a04a 2430 int err;
94122bbe 2431 struct sk_buff_head seg_queue;
9a91a04a 2432
31e8ce80
SWK		 2433 if (!chan->conn)
2434 return -ENOTCONN;
2435
9a91a04a 2436 /* Connectionless channel */
715ec005 2437 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
8d46321c 2438 skb = l2cap_create_connless_pdu(chan, msg, len);
9a91a04a
GP		 2439 if (IS_ERR(skb))
2440 return PTR_ERR(skb);
2441
ede81a2a
AK		 2442 /* Channel lock is released before requesting new skb and then
2443 * reacquired thus we need to recheck channel state.
2444 */
2445 if (chan->state != BT_CONNECTED) {
2446 kfree_skb(skb);
2447 return -ENOTCONN;
2448 }
2449
9a91a04a
GP		 2450 l2cap_do_send(chan, skb);
2451 return len;
2452 }
2453
2454 switch (chan->mode) {
38319713 2455 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2456 /* Check outgoing MTU */
2457 if (len > chan->omtu)
2458 return -EMSGSIZE;
2459
fad5fc89
JH		 2460 if (!chan->tx_credits)
2461 return -EAGAIN;
2462
177f8f2b
JH		 2463 __skb_queue_head_init(&seg_queue);
2464
2465 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2466
2467 if (chan->state != BT_CONNECTED) {
2468 __skb_queue_purge(&seg_queue);
2469 err = -ENOTCONN;
2470 }
2471
2472 if (err)
2473 return err;
2474
2475 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2476
2477 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2478 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2479 chan->tx_credits--;
2480 }
2481
2482 if (!chan->tx_credits)
2483 chan->ops->suspend(chan);
2484
2485 err = len;
2486
2487 break;
2488
fad5fc89 2489 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2490 /* Check outgoing MTU */
2491 if (len > chan->omtu)
2492 return -EMSGSIZE;
2493
2494 /* Create a basic PDU */
8d46321c 2495 skb = l2cap_create_basic_pdu(chan, msg, len);
9a91a04a
GP		 2496 if (IS_ERR(skb))
2497 return PTR_ERR(skb);
2498
ede81a2a
AK		 2499 /* Channel lock is released before requesting new skb and then
2500 * reacquired thus we need to recheck channel state.
2501 */
2502 if (chan->state != BT_CONNECTED) {
2503 kfree_skb(skb);
2504 return -ENOTCONN;
2505 }
2506
9a91a04a
GP		 2507 l2cap_do_send(chan, skb);
2508 err = len;
2509 break;
2510
2511 case L2CAP_MODE_ERTM:
2512 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2513 /* Check outgoing MTU */
2514 if (len > chan->omtu) {
2515 err = -EMSGSIZE;
2516 break;
2517 }
9a91a04a 2518
94122bbe 2519 __skb_queue_head_init(&seg_queue);
9a91a04a 2520
94122bbe
MM		 2521 /* Do segmentation before calling in to the state machine,
2522 * since it's possible to block while waiting for memory
2523 * allocation.
2524 */
2525 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2526
94122bbe
MM		 2527 /* The channel could have been closed while segmenting,
2528 * check that it is still connected.
2529 */
2530 if (chan->state != BT_CONNECTED) {
2531 __skb_queue_purge(&seg_queue);
2532 err = -ENOTCONN;
9a91a04a
GP		 2533 }
2534
94122bbe 2535 if (err)
9a91a04a 2536 break;
9a91a04a 2537
3733937d 2538 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2539 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2540 else
d660366d 2541 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2542
d660366d 2543 err = len;
9a91a04a 2544
94122bbe
MM		 2545 /* If the skbs were not queued for sending, they'll still be in
2546 * seg_queue and need to be purged.
2547 */
2548 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2549 break;
2550
2551 default:
2552 BT_DBG("bad state %1.1x", chan->mode);
2553 err = -EBADFD;
2554 }
2555
2556 return err;
2557}
6b8d4a6a 2558EXPORT_SYMBOL_GPL(l2cap_chan_send);
9a91a04a 2559
d2a7ac5d
MM		 2560static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2561{
bed68bde
MM		 2562 struct l2cap_ctrl control;
2563 u16 seq;
2564
b4400672 2565 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2566
2567 memset(&control, 0, sizeof(control));
2568 control.sframe = 1;
2569 control.super = L2CAP_SUPER_SREJ;
2570
2571 for (seq = chan->expected_tx_seq; seq != txseq;
2572 seq = __next_seq(chan, seq)) {
2573 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2574 control.reqseq = seq;
2575 l2cap_send_sframe(chan, &control);
2576 l2cap_seq_list_append(&chan->srej_list, seq);
2577 }
2578 }
2579
2580 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2581}
2582
2583static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2584{
bed68bde
MM		 2585 struct l2cap_ctrl control;
2586
2587 BT_DBG("chan %p", chan);
2588
2589 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2590 return;
2591
2592 memset(&control, 0, sizeof(control));
2593 control.sframe = 1;
2594 control.super = L2CAP_SUPER_SREJ;
2595 control.reqseq = chan->srej_list.tail;
2596 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2597}
2598
2599static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2600{
bed68bde
MM		 2601 struct l2cap_ctrl control;
2602 u16 initial_head;
2603 u16 seq;
2604
b4400672 2605 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2606
2607 memset(&control, 0, sizeof(control));
2608 control.sframe = 1;
2609 control.super = L2CAP_SUPER_SREJ;
2610
2611 /* Capture initial list head to allow only one pass through the list. */
2612 initial_head = chan->srej_list.head;
2613
2614 do {
2615 seq = l2cap_seq_list_pop(&chan->srej_list);
2616 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2617 break;
2618
2619 control.reqseq = seq;
2620 l2cap_send_sframe(chan, &control);
2621 l2cap_seq_list_append(&chan->srej_list, seq);
2622 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2623}
2624
608bcc6d
MM		 2625static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2626{
2627 struct sk_buff *acked_skb;
2628 u16 ackseq;
2629
b4400672 2630 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2631
2632 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2633 return;
2634
b4400672 2635 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2636 chan->expected_ack_seq, chan->unacked_frames);
2637
2638 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2639 ackseq = __next_seq(chan, ackseq)) {
2640
2641 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2642 if (acked_skb) {
2643 skb_unlink(acked_skb, &chan->tx_q);
2644 kfree_skb(acked_skb);
2645 chan->unacked_frames--;
2646 }
2647 }
2648
2649 chan->expected_ack_seq = reqseq;
2650
2651 if (chan->unacked_frames == 0)
2652 __clear_retrans_timer(chan);
2653
b4400672 2654 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2655}
2656
2657static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2658{
2659 BT_DBG("chan %p", chan);
2660
2661 chan->expected_tx_seq = chan->buffer_seq;
2662 l2cap_seq_list_clear(&chan->srej_list);
2663 skb_queue_purge(&chan->srej_q);
2664 chan->rx_state = L2CAP_RX_STATE_RECV;
2665}
2666
d660366d
GP		 2667static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2668 struct l2cap_ctrl *control,
2669 struct sk_buff_head *skbs, u8 event)
608bcc6d 2670{
608bcc6d
MM		 2671 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2672 event);
2673
2674 switch (event) {
2675 case L2CAP_EV_DATA_REQUEST:
2676 if (chan->tx_send_head == NULL)
2677 chan->tx_send_head = skb_peek(skbs);
2678
2679 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2680 l2cap_ertm_send(chan);
2681 break;
2682 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2683 BT_DBG("Enter LOCAL_BUSY");
2684 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2685
2686 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2687 /* The SREJ_SENT state must be aborted if we are to
2688 * enter the LOCAL_BUSY state.
2689 */
2690 l2cap_abort_rx_srej_sent(chan);
2691 }
2692
2693 l2cap_send_ack(chan);
2694
2695 break;
2696 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2697 BT_DBG("Exit LOCAL_BUSY");
2698 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2699
2700 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2701 struct l2cap_ctrl local_control;
2702
2703 memset(&local_control, 0, sizeof(local_control));
2704 local_control.sframe = 1;
2705 local_control.super = L2CAP_SUPER_RR;
2706 local_control.poll = 1;
2707 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2708 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2709
2710 chan->retry_count = 1;
2711 __set_monitor_timer(chan);
2712 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2713 }
2714 break;
2715 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2716 l2cap_process_reqseq(chan, control->reqseq);
2717 break;
2718 case L2CAP_EV_EXPLICIT_POLL:
2719 l2cap_send_rr_or_rnr(chan, 1);
2720 chan->retry_count = 1;
2721 __set_monitor_timer(chan);
2722 __clear_ack_timer(chan);
2723 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2724 break;
2725 case L2CAP_EV_RETRANS_TO:
2726 l2cap_send_rr_or_rnr(chan, 1);
2727 chan->retry_count = 1;
2728 __set_monitor_timer(chan);
2729 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2730 break;
2731 case L2CAP_EV_RECV_FBIT:
2732 /* Nothing to process */
2733 break;
2734 default:
2735 break;
2736 }
608bcc6d
MM		 2737}
2738
d660366d
GP		 2739static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2740 struct l2cap_ctrl *control,
2741 struct sk_buff_head *skbs, u8 event)
608bcc6d 2742{
608bcc6d
MM		 2743 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2744 event);
2745
2746 switch (event) {
2747 case L2CAP_EV_DATA_REQUEST:
2748 if (chan->tx_send_head == NULL)
2749 chan->tx_send_head = skb_peek(skbs);
2750 /* Queue data, but don't send. */
2751 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2752 break;
2753 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2754 BT_DBG("Enter LOCAL_BUSY");
2755 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2756
2757 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2758 /* The SREJ_SENT state must be aborted if we are to
2759 * enter the LOCAL_BUSY state.
2760 */
2761 l2cap_abort_rx_srej_sent(chan);
2762 }
2763
2764 l2cap_send_ack(chan);
2765
2766 break;
2767 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2768 BT_DBG("Exit LOCAL_BUSY");
2769 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2770
2771 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2772 struct l2cap_ctrl local_control;
2773 memset(&local_control, 0, sizeof(local_control));
2774 local_control.sframe = 1;
2775 local_control.super = L2CAP_SUPER_RR;
2776 local_control.poll = 1;
2777 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2778 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2779
2780 chan->retry_count = 1;
2781 __set_monitor_timer(chan);
2782 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2783 }
2784 break;
2785 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2786 l2cap_process_reqseq(chan, control->reqseq);
2787
2788 /* Fall through */
2789
2790 case L2CAP_EV_RECV_FBIT:
2791 if (control && control->final) {
2792 __clear_monitor_timer(chan);
2793 if (chan->unacked_frames > 0)
2794 __set_retrans_timer(chan);
2795 chan->retry_count = 0;
2796 chan->tx_state = L2CAP_TX_STATE_XMIT;
2797 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2798 }
2799 break;
2800 case L2CAP_EV_EXPLICIT_POLL:
2801 /* Ignore */
2802 break;
2803 case L2CAP_EV_MONITOR_TO:
2804 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2805 l2cap_send_rr_or_rnr(chan, 1);
2806 __set_monitor_timer(chan);
2807 chan->retry_count++;
2808 } else {
5e4e3972 2809 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2810 }
2811 break;
2812 default:
2813 break;
2814 }
608bcc6d
MM		 2815}
2816
d660366d
GP		 2817static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2818 struct sk_buff_head *skbs, u8 event)
608bcc6d 2819{
608bcc6d
MM		 2820 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2821 chan, control, skbs, event, chan->tx_state);
2822
2823 switch (chan->tx_state) {
2824 case L2CAP_TX_STATE_XMIT:
d660366d 2825 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2826 break;
2827 case L2CAP_TX_STATE_WAIT_F:
d660366d 2828 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2829 break;
2830 default:
2831 /* Ignore event */
2832 break;
2833 }
608bcc6d
MM		 2834}
2835
4b51dae9
MM		 2836static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2837 struct l2cap_ctrl *control)
2838{
2839 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2840 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2841}
2842
f80842a8
MM		 2843static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2844 struct l2cap_ctrl *control)
2845{
2846 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2847 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2848}
2849
1da177e4
LT		 2850/* Copy frame to all raw sockets on that connection */
2851static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2852{
1da177e4 2853 struct sk_buff *nskb;
48454079 2854 struct l2cap_chan *chan;
1da177e4
LT		 2855
2856 BT_DBG("conn %p", conn);
2857
3df91ea2 2858 mutex_lock(&conn->chan_lock);
3d57dc68 2859
3df91ea2 2860 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2861 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2862 continue;
2863
7f5396a7 2864 /* Don't send frame to the channel it came from */
a4368ff3 2865 if (bt_cb(skb)->l2cap.chan == chan)
1da177e4 2866 continue;
7f5396a7 2867
8bcde1f2 2868 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2869 if (!nskb)
1da177e4 2870 continue;
80b98027 2871 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2872 kfree_skb(nskb);
2873 }
3d57dc68 2874
3df91ea2 2875 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2876}
2877
2878/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2879static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2880 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2881{
2882 struct sk_buff *skb, **frag;
2883 struct l2cap_cmd_hdr *cmd;
2884 struct l2cap_hdr *lh;
2885 int len, count;
2886
b4400672
AE		 2887 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2888 conn, code, ident, dlen);
1da177e4 2889
300b962e
AL		 2890 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2891 return NULL;
2892
1da177e4
LT		 2893 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2894 count = min_t(unsigned int, conn->mtu, len);
2895
8bcde1f2 2896 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2897 if (!skb)
2898 return NULL;
2899
2900 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2901 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2902
2903 if (conn->hcon->type == LE_LINK)
dcf4adbf 2904 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2905 else
dcf4adbf 2906 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2907
2908 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2909 cmd->code = code;
2910 cmd->ident = ident;
aca3192c 2911 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2912
2913 if (dlen) {
2914 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2915 memcpy(skb_put(skb, count), data, count);
2916 data += count;
2917 }
2918
2919 len -= skb->len;
2920
2921 /* Continuation fragments (no L2CAP header) */
2922 frag = &skb_shinfo(skb)->frag_list;
2923 while (len) {
2924 count = min_t(unsigned int, conn->mtu, len);
2925
8bcde1f2 2926 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2927 if (!*frag)
2928 goto fail;
2929
2930 memcpy(skb_put(*frag, count), data, count);
2931
2932 len -= count;
2933 data += count;
2934
2935 frag = &(*frag)->next;
2936 }
2937
2938 return skb;
2939
2940fail:
2941 kfree_skb(skb);
2942 return NULL;
2943}
2944
2d792818
GP		 2945static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2946 unsigned long *val)
1da177e4
LT		 2947{
2948 struct l2cap_conf_opt *opt = *ptr;
2949 int len;
2950
2951 len = L2CAP_CONF_OPT_SIZE + opt->len;
2952 *ptr += len;
2953
2954 *type = opt->type;
2955 *olen = opt->len;
2956
2957 switch (opt->len) {
2958 case 1:
2959 *val = *((u8 *) opt->val);
2960 break;
2961
2962 case 2:
bfaaeb3e 2963 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2964 break;
2965
2966 case 4:
bfaaeb3e 2967 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2968 break;
2969
2970 default:
2971 *val = (unsigned long) opt->val;
2972 break;
2973 }
2974
b4400672 2975 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2976 return len;
2977}
2978
1da177e4
LT		 2979static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2980{
2981 struct l2cap_conf_opt *opt = *ptr;
2982
b4400672 2983 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2984
2985 opt->type = type;
2986 opt->len = len;
2987
2988 switch (len) {
2989 case 1:
2990 *((u8 *) opt->val) = val;
2991 break;
2992
2993 case 2:
4f8b691c 2994 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2995 break;
2996
2997 case 4:
4f8b691c 2998 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2999 break;
3000
3001 default:
3002 memcpy(opt->val, (void *) val, len);
3003 break;
3004 }
3005
3006 *ptr += L2CAP_CONF_OPT_SIZE + len;
3007}
3008
f89cef09
AE		 3009static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
3010{
3011 struct l2cap_conf_efs efs;
3012
1ec918ce 3013 switch (chan->mode) {
f89cef09
AE		 3014 case L2CAP_MODE_ERTM:
3015 efs.id = chan->local_id;
3016 efs.stype = chan->local_stype;
3017 efs.msdu = cpu_to_le16(chan->local_msdu);
3018 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
dcf4adbf
JP		 3019 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
3020 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3021 break;
3022
3023 case L2CAP_MODE_STREAMING:
3024 efs.id = 1;
3025 efs.stype = L2CAP_SERV_BESTEFFORT;
3026 efs.msdu = cpu_to_le16(chan->local_msdu);
3027 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3028 efs.acc_lat = 0;
3029 efs.flush_to = 0;
3030 break;
3031
3032 default:
3033 return;
3034 }
3035
3036 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3037 (unsigned long) &efs);
f89cef09
AE		 3038}
3039
721c4181 3040static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3041{
721c4181 3042 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3043 ack_timer.work);
3044 u16 frames_to_ack;
c1b4f43b 3045
2fb9b3d4
GP		 3046 BT_DBG("chan %p", chan);
3047
6be36555
AE		 3048 l2cap_chan_lock(chan);
3049
0362520b
MM		 3050 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3051 chan->last_acked_seq);
6be36555 3052
0362520b
MM		 3053 if (frames_to_ack)
3054 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3055
0362520b 3056 l2cap_chan_unlock(chan);
09bfb2ee 3057 l2cap_chan_put(chan);
c1b4f43b
GP		 3058}
3059
466f8004 3060int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3061{
3c588192
MM		 3062 int err;
3063
105bdf9e
MM		 3064 chan->next_tx_seq = 0;
3065 chan->expected_tx_seq = 0;
42e5c802 3066 chan->expected_ack_seq = 0;
6a026610 3067 chan->unacked_frames = 0;
42e5c802 3068 chan->buffer_seq = 0;
6a026610 3069 chan->frames_sent = 0;
105bdf9e
MM		 3070 chan->last_acked_seq = 0;
3071 chan->sdu = NULL;
3072 chan->sdu_last_frag = NULL;
3073 chan->sdu_len = 0;
3074
d34c34fb
MM		 3075 skb_queue_head_init(&chan->tx_q);
3076
6ed971ca
MH		 3077 chan->local_amp_id = AMP_ID_BREDR;
3078 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3079 chan->move_state = L2CAP_MOVE_STABLE;
3080 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3081
105bdf9e
MM		 3082 if (chan->mode != L2CAP_MODE_ERTM)
3083 return 0;
3084
3085 chan->rx_state = L2CAP_RX_STATE_RECV;
3086 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3087
721c4181
GP		 3088 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3089 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3090 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3091
f1c6775b 3092 skb_queue_head_init(&chan->srej_q);
1890d36b 3093
3c588192
MM		 3094 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3095 if (err < 0)
3096 return err;
3097
9dc9affc
MM		 3098 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3099 if (err < 0)
3100 l2cap_seq_list_free(&chan->srej_list);
3101
3102 return err;
0565c1c2
GP		 3103}
3104
f2fcfcd6
GP		 3105static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3106{
3107 switch (mode) {
3108 case L2CAP_MODE_STREAMING:
3109 case L2CAP_MODE_ERTM:
3110 if (l2cap_mode_supported(mode, remote_feat_mask))
3111 return mode;
3112 /* fall through */
3113 default:
3114 return L2CAP_MODE_BASIC;
3115 }
3116}
3117
848566b3 3118static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3119{
0bd49fc7
JH		 3120 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3121 (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW));
6327eb98
AE		 3122}
3123
848566b3 3124static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3125{
0bd49fc7
JH		 3126 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3127 (conn->feat_mask & L2CAP_FEAT_EXT_FLOW));
f89cef09
AE		 3128}
3129
36c86c85
MM		 3130static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3131 struct l2cap_conf_rfc *rfc)
3132{
6ed971ca 3133 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3134 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3135
3136 /* Class 1 devices have must have ERTM timeouts
3137 * exceeding the Link Supervision Timeout. The
3138 * default Link Supervision Timeout for AMP
3139 * controllers is 10 seconds.
3140 *
3141 * Class 1 devices use 0xffffffff for their
3142 * best-effort flush timeout, so the clamping logic
3143 * will result in a timeout that meets the above
3144 * requirement. ERTM timeouts are 16-bit values, so
3145 * the maximum timeout is 65.535 seconds.
3146 */
3147
3148 /* Convert timeout to milliseconds and round */
3149 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3150
3151 /* This is the recommended formula for class 2 devices
3152 * that start ERTM timers when packets are sent to the
3153 * controller.
3154 */
3155 ertm_to = 3 * ertm_to + 500;
3156
3157 if (ertm_to > 0xffff)
3158 ertm_to = 0xffff;
3159
3160 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3161 rfc->monitor_timeout = rfc->retrans_timeout;
3162 } else {
dcf4adbf
JP		 3163 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3164 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
36c86c85
MM		 3165 }
3166}
3167
6327eb98
AE		 3168static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3169{
3170 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3171 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3172 /* use extended control field */
3173 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3174 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3175 } else {
6327eb98 3176 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3177 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3178 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3179 }
c20f8e35 3180 chan->ack_win = chan->tx_win;
6327eb98
AE		 3181}
3182
710f9b0a 3183static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3184{
1da177e4 3185 struct l2cap_conf_req *req = data;
0c1bc5c6 3186 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3187 void *ptr = req->data;
c8f79162 3188 u16 size;
1da177e4 3189
49208c9c 3190 BT_DBG("chan %p", chan);
1da177e4 3191
73ffa904 3192 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3193 goto done;
3194
0c1bc5c6 3195 switch (chan->mode) {
f2fcfcd6
GP		 3196 case L2CAP_MODE_STREAMING:
3197 case L2CAP_MODE_ERTM:
c1360a1c 3198 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3199 break;
85eb53c6 3200
848566b3 3201 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3202 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3203
2ba13ed6 3204 /* fall through */
f2fcfcd6 3205 default:
8c1d787b 3206 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3207 break;
3208 }
3209
3210done:
0c1bc5c6
GP		 3211 if (chan->imtu != L2CAP_DEFAULT_MTU)
3212 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3213
0c1bc5c6 3214 switch (chan->mode) {
65c7c491 3215 case L2CAP_MODE_BASIC:
6fea7ad1
MH		 3216 if (disable_ertm)
3217 break;
3218
8c1d787b 3219 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3220 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3221 break;
3222
62547752
GP		 3223 rfc.mode = L2CAP_MODE_BASIC;
3224 rfc.txwin_size = 0;
3225 rfc.max_transmit = 0;
3226 rfc.retrans_timeout = 0;
3227 rfc.monitor_timeout = 0;
3228 rfc.max_pdu_size = 0;
3229
63406504 3230 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3231 (unsigned long) &rfc);
65c7c491
MH		 3232 break;
3233
3234 case L2CAP_MODE_ERTM:
3235 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3236 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3237
3238 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3239
3240 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3241 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3242 L2CAP_FCS_SIZE);
c8f79162 3243 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3244
6327eb98
AE		 3245 l2cap_txwin_setup(chan);
3246
3247 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3248 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3249
63406504 3250 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3251 (unsigned long) &rfc);
63406504 3252
f89cef09
AE		 3253 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3254 l2cap_add_opt_efs(&ptr, chan);
3255
6327eb98
AE		 3256 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3257 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3258 chan->tx_win);
60918918
AE		 3259
3260 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3261 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3262 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3263 chan->fcs = L2CAP_FCS_NONE;
3264 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3265 chan->fcs);
3266 }
f2fcfcd6
GP		 3267 break;
3268
3269 case L2CAP_MODE_STREAMING:
273759e2 3270 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3271 rfc.mode = L2CAP_MODE_STREAMING;
3272 rfc.txwin_size = 0;
3273 rfc.max_transmit = 0;
3274 rfc.retrans_timeout = 0;
3275 rfc.monitor_timeout = 0;
c8f79162
AE		 3276
3277 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3278 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3279 L2CAP_FCS_SIZE);
c8f79162 3280 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3281
63406504 3282 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3283 (unsigned long) &rfc);
63406504 3284
f89cef09
AE		 3285 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3286 l2cap_add_opt_efs(&ptr, chan);
3287
60918918
AE		 3288 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3289 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3290 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3291 chan->fcs = L2CAP_FCS_NONE;
3292 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3293 chan->fcs);
3294 }
65c7c491
MH		 3295 break;
3296 }
1da177e4 3297
fe4128e0 3298 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3299 req->flags = cpu_to_le16(0);
1da177e4
LT		 3300
3301 return ptr - data;
3302}
3303
73ffa904 3304static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3305{
5dee9e7c
MH		 3306 struct l2cap_conf_rsp *rsp = data;
3307 void *ptr = rsp->data;
73ffa904
GP		 3308 void *req = chan->conf_req;
3309 int len = chan->conf_len;
5dee9e7c
MH		 3310 int type, hint, olen;
3311 unsigned long val;
6464f35f 3312 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3313 struct l2cap_conf_efs efs;
3314 u8 remote_efs = 0;
861d6882 3315 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3316 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3317 u16 size;
1da177e4 3318
73ffa904 3319 BT_DBG("chan %p", chan);
820ae1b8 3320
5dee9e7c
MH		 3321 while (len >= L2CAP_CONF_OPT_SIZE) {
3322 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3323
589d2746 3324 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3325 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3326
3327 switch (type) {
3328 case L2CAP_CONF_MTU:
861d6882 3329 mtu = val;
5dee9e7c
MH		 3330 break;
3331
3332 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3333 chan->flush_to = val;
5dee9e7c
MH		 3334 break;
3335
3336 case L2CAP_CONF_QOS:
3337 break;
3338
6464f35f
MH		 3339 case L2CAP_CONF_RFC:
3340 if (olen == sizeof(rfc))
3341 memcpy(&rfc, (void *) val, olen);
3342 break;
3343
fcc203c3
GP		 3344 case L2CAP_CONF_FCS:
3345 if (val == L2CAP_FCS_NONE)
f2592d3e 3346 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3347 break;
fcc203c3 3348
42dceae2
AE		 3349 case L2CAP_CONF_EFS:
3350 remote_efs = 1;
3351 if (olen == sizeof(efs))
3352 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3353 break;
3354
6327eb98 3355 case L2CAP_CONF_EWS:
0bd49fc7 3356 if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP))
6327eb98 3357 return -ECONNREFUSED;
fcc203c3 3358
6327eb98
AE		 3359 set_bit(FLAG_EXT_CTRL, &chan->flags);
3360 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3361 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3362 chan->remote_tx_win = val;
fcc203c3
GP		 3363 break;
3364
5dee9e7c
MH		 3365 default:
3366 if (hint)
3367 break;
3368
3369 result = L2CAP_CONF_UNKNOWN;
3370 *((u8 *) ptr++) = type;
3371 break;
3372 }
3373 }
3374
73ffa904 3375 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3376 goto done;
3377
0c1bc5c6 3378 switch (chan->mode) {
f2fcfcd6
GP		 3379 case L2CAP_MODE_STREAMING:
3380 case L2CAP_MODE_ERTM:
c1360a1c 3381 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3382 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3383 chan->conn->feat_mask);
85eb53c6
GP		 3384 break;
3385 }
3386
42dceae2 3387 if (remote_efs) {
848566b3 3388 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3389 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3390 else
3391 return -ECONNREFUSED;
3392 }
3393
0c1bc5c6 3394 if (chan->mode != rfc.mode)
f2fcfcd6 3395 return -ECONNREFUSED;
742e519b 3396
f2fcfcd6 3397 break;
f2fcfcd6
GP		 3398 }
3399
3400done:
0c1bc5c6 3401 if (chan->mode != rfc.mode) {
f2fcfcd6 3402 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3403 rfc.mode = chan->mode;
f2fcfcd6 3404
73ffa904 3405 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3406 return -ECONNREFUSED;
3407
2d792818
GP		 3408 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3409 (unsigned long) &rfc);
f2fcfcd6
GP		 3410 }
3411
5dee9e7c
MH		 3412 if (result == L2CAP_CONF_SUCCESS) {
3413 /* Configure output options and let the other side know
3414 * which ones we don't like. */
3415
f2fcfcd6
GP		 3416 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3417 result = L2CAP_CONF_UNACCEPT;
3418 else {
0c1bc5c6 3419 chan->omtu = mtu;
c1360a1c 3420 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3421 }
0c1bc5c6 3422 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3423
42dceae2
AE		 3424 if (remote_efs) {
3425 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3426 efs.stype != L2CAP_SERV_NOTRAFIC &&
3427 efs.stype != chan->local_stype) {
42dceae2
AE		 3428
3429 result = L2CAP_CONF_UNACCEPT;
3430
3431 if (chan->num_conf_req >= 1)
3432 return -ECONNREFUSED;
3433
3434 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3435 sizeof(efs),
3436 (unsigned long) &efs);
0e8b207e 3437 } else {
3e6b3b95 3438 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3439 result = L2CAP_CONF_PENDING;
3440 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3441 }
3442 }
3443
f2fcfcd6
GP		 3444 switch (rfc.mode) {
3445 case L2CAP_MODE_BASIC:
47d1ec61 3446 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3447 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3448 break;
3449
3450 case L2CAP_MODE_ERTM:
6327eb98
AE		 3451 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3452 chan->remote_tx_win = rfc.txwin_size;
3453 else
3454 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3455
2c03a7a4 3456 chan->remote_max_tx = rfc.max_transmit;
1c762159 3457
c8f79162 3458 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3459 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3460 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3461 rfc.max_pdu_size = cpu_to_le16(size);
3462 chan->remote_mps = size;
f2fcfcd6 3463
36c86c85 3464 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3465
c1360a1c 3466 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3467
3468 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3469 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3470
42dceae2
AE		 3471 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3472 chan->remote_id = efs.id;
3473 chan->remote_stype = efs.stype;
3474 chan->remote_msdu = le16_to_cpu(efs.msdu);
3475 chan->remote_flush_to =
2d792818 3476 le32_to_cpu(efs.flush_to);
42dceae2 3477 chan->remote_acc_lat =
2d792818 3478 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3479 chan->remote_sdu_itime =
3480 le32_to_cpu(efs.sdu_itime);
3481 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3482 sizeof(efs),
3483 (unsigned long) &efs);
42dceae2 3484 }
f2fcfcd6
GP		 3485 break;
3486
3487 case L2CAP_MODE_STREAMING:
c8f79162 3488 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3489 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3490 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3491 rfc.max_pdu_size = cpu_to_le16(size);
3492 chan->remote_mps = size;
f2fcfcd6 3493
c1360a1c 3494 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3495
2d792818
GP		 3496 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3497 (unsigned long) &rfc);
68ae6639 3498
f2fcfcd6
GP		 3499 break;
3500
3501 default:
5dee9e7c 3502 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3503
6464f35f 3504 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3505 rfc.mode = chan->mode;
f2fcfcd6 3506 }
6464f35f 3507
f2fcfcd6 3508 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3509 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3510 }
fe4128e0 3511 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3512 rsp->result = cpu_to_le16(result);
dcf4adbf 3513 rsp->flags = cpu_to_le16(0);
5dee9e7c
MH		 3514
3515 return ptr - data;
1da177e4
LT		 3516}
3517
2d792818
GP		 3518static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3519 void *data, u16 *result)
f2fcfcd6 3520{
f2fcfcd6
GP		 3521 struct l2cap_conf_req *req = data;
3522 void *ptr = req->data;
3523 int type, olen;
3524 unsigned long val;
36e999a8 3525 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3526 struct l2cap_conf_efs efs;
f2fcfcd6 3527
fe4128e0 3528 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3529
3530 while (len >= L2CAP_CONF_OPT_SIZE) {
3531 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3532
3533 switch (type) {
3534 case L2CAP_CONF_MTU:
3535 if (val < L2CAP_DEFAULT_MIN_MTU) {
3536 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3537 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3538 } else
0c1bc5c6
GP		 3539 chan->imtu = val;
3540 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3541 break;
3542
3543 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3544 chan->flush_to = val;
f2fcfcd6 3545 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3546 2, chan->flush_to);
f2fcfcd6
GP		 3547 break;
3548
3549 case L2CAP_CONF_RFC:
3550 if (olen == sizeof(rfc))
3551 memcpy(&rfc, (void *)val, olen);
3552
c1360a1c 3553 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3554 rfc.mode != chan->mode)
f2fcfcd6
GP		 3555 return -ECONNREFUSED;
3556
47d1ec61 3557 chan->fcs = 0;
f2fcfcd6
GP		 3558
3559 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3560 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3561 break;
6327eb98
AE		 3562
3563 case L2CAP_CONF_EWS:
c20f8e35 3564 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3565 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3566 chan->tx_win);
6327eb98 3567 break;
66af7aaf
AE		 3568
3569 case L2CAP_CONF_EFS:
3570 if (olen == sizeof(efs))
3571 memcpy(&efs, (void *)val, olen);
3572
3573 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3574 efs.stype != L2CAP_SERV_NOTRAFIC &&
3575 efs.stype != chan->local_stype)
66af7aaf
AE		 3576 return -ECONNREFUSED;
3577
2d792818
GP		 3578 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3579 (unsigned long) &efs);
66af7aaf 3580 break;
cbabee78
AE		 3581
3582 case L2CAP_CONF_FCS:
3583 if (*result == L2CAP_CONF_PENDING)
3584 if (val == L2CAP_FCS_NONE)
f2592d3e 3585 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3586 &chan->conf_state);
3587 break;
f2fcfcd6
GP		 3588 }
3589 }
3590
0c1bc5c6 3591 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3592 return -ECONNREFUSED;
3593
0c1bc5c6 3594 chan->mode = rfc.mode;
6c2ea7a8 3595
0e8b207e 3596 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3597 switch (rfc.mode) {
3598 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3599 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3600 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3601 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3602 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3603 chan->ack_win = min_t(u16, chan->ack_win,
3604 rfc.txwin_size);
66af7aaf
AE		 3605
3606 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3607 chan->local_msdu = le16_to_cpu(efs.msdu);
3608 chan->local_sdu_itime =
2d792818 3609 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3610 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3611 chan->local_flush_to =
2d792818 3612 le32_to_cpu(efs.flush_to);
66af7aaf 3613 }
f2fcfcd6 3614 break;
66af7aaf 3615
f2fcfcd6 3616 case L2CAP_MODE_STREAMING:
47d1ec61 3617 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3618 }
3619 }
3620
fe4128e0 3621 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3622 req->flags = cpu_to_le16(0);
f2fcfcd6
GP		 3623
3624 return ptr - data;
3625}
3626
2d792818
GP		 3627static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3628 u16 result, u16 flags)
1da177e4
LT		 3629{
3630 struct l2cap_conf_rsp *rsp = data;
3631 void *ptr = rsp->data;
1da177e4 3632
fe4128e0 3633 BT_DBG("chan %p", chan);
1da177e4 3634
fe4128e0 3635 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3636 rsp->result = cpu_to_le16(result);
aca3192c 3637 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3638
3639 return ptr - data;
3640}
3641
27e2d4c8
JH		 3642void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3643{
3644 struct l2cap_le_conn_rsp rsp;
3645 struct l2cap_conn *conn = chan->conn;
3646
3647 BT_DBG("chan %p", chan);
3648
3649 rsp.dcid = cpu_to_le16(chan->scid);
3650 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3651 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3652 rsp.credits = cpu_to_le16(chan->rx_credits);
dcf4adbf 3653 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
27e2d4c8
JH		 3654
3655 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3656 &rsp);
3657}
3658
8c1d787b 3659void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3660{
3661 struct l2cap_conn_rsp rsp;
8c1d787b 3662 struct l2cap_conn *conn = chan->conn;
710f9b0a 3663 u8 buf[128];
439f34ac 3664 u8 rsp_code;
710f9b0a 3665
fe4128e0
GP		 3666 rsp.scid = cpu_to_le16(chan->dcid);
3667 rsp.dcid = cpu_to_le16(chan->scid);
dcf4adbf
JP		 3668 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3669 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3670
3671 if (chan->hs_hcon)
3672 rsp_code = L2CAP_CREATE_CHAN_RSP;
3673 else
3674 rsp_code = L2CAP_CONN_RSP;
3675
3676 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3677
3678 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3679
c1360a1c 3680 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3681 return;
3682
710f9b0a 3683 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3684 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3685 chan->num_conf_req++;
3686}
3687
47d1ec61 3688static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3689{
7b1c0049
GP		 3690 int type, olen;
3691 unsigned long val;
c20f8e35
MM		 3692 /* Use sane default values in case a misbehaving remote device
3693 * did not send an RFC or extended window size option.
3694 */
3695 u16 txwin_ext = chan->ack_win;
3696 struct l2cap_conf_rfc rfc = {
3697 .mode = chan->mode,
dcf4adbf
JP		 3698 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3699 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
c20f8e35
MM		 3700 .max_pdu_size = cpu_to_le16(chan->imtu),
3701 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3702 };
7b1c0049 3703
47d1ec61 3704 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3705
0c1bc5c6 3706 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3707 return;
3708
3709 while (len >= L2CAP_CONF_OPT_SIZE) {
3710 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3711
c20f8e35
MM		 3712 switch (type) {
3713 case L2CAP_CONF_RFC:
3714 if (olen == sizeof(rfc))
3715 memcpy(&rfc, (void *)val, olen);
8f321f85 3716 break;
c20f8e35
MM		 3717 case L2CAP_CONF_EWS:
3718 txwin_ext = val;
3719 break;
3720 }
7b1c0049
GP		 3721 }
3722
7b1c0049
GP		 3723 switch (rfc.mode) {
3724 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3725 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3726 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3727 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3728 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3729 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3730 else
3731 chan->ack_win = min_t(u16, chan->ack_win,
3732 rfc.txwin_size);
7b1c0049
GP		 3733 break;
3734 case L2CAP_MODE_STREAMING:
47d1ec61 3735 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3736 }
3737}
3738
2d792818 3739static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3740 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3741 u8 *data)
4e8402a3 3742{
e2fd318e 3743 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3744
cb3b3152
JH		 3745 if (cmd_len < sizeof(*rej))
3746 return -EPROTO;
3747
e2fd318e 3748 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3749 return 0;
3750
3751 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3752 cmd->ident == conn->info_ident) {
17cd3f37 3753 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3754
3755 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3756 conn->info_ident = 0;
984947dc 3757
4e8402a3
MH		 3758 l2cap_conn_start(conn);
3759 }
3760
3761 return 0;
3762}
3763
1700915f
MM		 3764static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3765 struct l2cap_cmd_hdr *cmd,
3766 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3767{
1da177e4
LT		 3768 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3769 struct l2cap_conn_rsp rsp;
23691d75 3770 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3771 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3772
3773 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3774 __le16 psm = req->psm;
1da177e4 3775
097db76c 3776 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3777
3778 /* Check if we have socket listening on psm */
6f59b904 3779 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3780 &conn->hcon->dst, ACL_LINK);
23691d75 3781 if (!pchan) {
1da177e4
LT		 3782 result = L2CAP_CR_BAD_PSM;
3783 goto sendresp;
3784 }
3785
3df91ea2 3786 mutex_lock(&conn->chan_lock);
8ffb9290 3787 l2cap_chan_lock(pchan);
e0f0cb56 3788
e7c29cb1 3789 /* Check if the ACL is secure enough (if not SDP) */
dcf4adbf 3790 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3791 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3792 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3793 result = L2CAP_CR_SEC_BLOCK;
3794 goto response;
3795 }
3796
1da177e4
LT		 3797 result = L2CAP_CR_NO_MEM;
3798
2dfa1003
GP		 3799 /* Check if we already have channel with that dcid */
3800 if (__l2cap_get_chan_by_dcid(conn, scid))
3801 goto response;
3802
80b98027 3803 chan = pchan->ops->new_connection(pchan);
80808e43 3804 if (!chan)
1da177e4
LT		 3805 goto response;
3806
330b6c15
SS		 3807 /* For certain devices (ex: HID mouse), support for authentication,
3808 * pairing and bonding is optional. For such devices, inorder to avoid
3809 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3810 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3811 */
3812 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3813
7eafc59e
MH		 3814 bacpy(&chan->src, &conn->hcon->src);
3815 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 3816 chan->src_type = bdaddr_src_type(conn->hcon);
3817 chan->dst_type = bdaddr_dst_type(conn->hcon);
fe4128e0
GP		 3818 chan->psm = psm;
3819 chan->dcid = scid;
1700915f 3820 chan->local_amp_id = amp_id;
1da177e4 3821
6be36555 3822 __l2cap_chan_add(conn, chan);
48454079 3823
fe4128e0 3824 dcid = chan->scid;
1da177e4 3825
8d836d71 3826 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3827
fc7f8a7e 3828 chan->ident = cmd->ident;
1da177e4 3829
984947dc 3830 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
e7cafc45 3831 if (l2cap_chan_check_security(chan, false)) {
bdc25783 3832 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3833 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3834 result = L2CAP_CR_PEND;
3835 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3836 chan->ops->defer(chan);
f66dc81f 3837 } else {
1700915f
MM		 3838 /* Force pending result for AMP controllers.
3839 * The connection will succeed after the
3840 * physical link is up.
3841 */
6ed971ca 3842 if (amp_id == AMP_ID_BREDR) {
f93fa273 3843 l2cap_state_change(chan, BT_CONFIG);
1700915f 3844 result = L2CAP_CR_SUCCESS;
6ed971ca 3845 } else {
f93fa273 3846 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3847 result = L2CAP_CR_PEND;
1700915f 3848 }
f66dc81f
MH		 3849 status = L2CAP_CS_NO_INFO;
3850 }
79d554a6 3851 } else {
f93fa273 3852 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3853 result = L2CAP_CR_PEND;
3854 status = L2CAP_CS_AUTHEN_PEND;
3855 }
3856 } else {
f93fa273 3857 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3858 result = L2CAP_CR_PEND;
3859 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3860 }
3861
1da177e4 3862response:
8ffb9290 3863 l2cap_chan_unlock(pchan);
3df91ea2 3864 mutex_unlock(&conn->chan_lock);
a24cce14 3865 l2cap_chan_put(pchan);
1da177e4
LT		 3866
3867sendresp:
aca3192c
YH		 3868 rsp.scid = cpu_to_le16(scid);
3869 rsp.dcid = cpu_to_le16(dcid);
3870 rsp.result = cpu_to_le16(result);
3871 rsp.status = cpu_to_le16(status);
4c89b6aa 3872 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3873
3874 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3875 struct l2cap_info_req info;
dcf4adbf 3876 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3877
3878 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3879 conn->info_ident = l2cap_get_ident(conn);
3880
ba13ccd9 3881 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3882
2d792818
GP		 3883 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3884 sizeof(info), &info);
79d554a6
MH		 3885 }
3886
c1360a1c 3887 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3888 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3889 u8 buf[128];
c1360a1c 3890 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3891 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3892 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3893 chan->num_conf_req++;
e9aeb2dd 3894 }
1700915f
MM		 3895
3896 return chan;
4c89b6aa 3897}
e9aeb2dd 3898
4c89b6aa 3899static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3900 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3901{
7b064eda
JK		 3902 struct hci_dev *hdev = conn->hcon->hdev;
3903 struct hci_conn *hcon = conn->hcon;
3904
cb3b3152
JH		 3905 if (cmd_len < sizeof(struct l2cap_conn_req))
3906 return -EPROTO;
3907
7b064eda 3908 hci_dev_lock(hdev);
d7a5a11d 3909 if (hci_dev_test_flag(hdev, HCI_MGMT) &&
7b064eda 3910 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
48ec92fa 3911 mgmt_device_connected(hdev, hcon, 0, NULL, 0);
7b064eda
JK		 3912 hci_dev_unlock(hdev);
3913
300229f9 3914 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3915 return 0;
3916}
3917
5909cf30 3918static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3919 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3920 u8 *data)
1da177e4
LT		 3921{
3922 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3923 u16 scid, dcid, result, status;
48454079 3924 struct l2cap_chan *chan;
1da177e4 3925 u8 req[128];
3df91ea2 3926 int err;
1da177e4 3927
cb3b3152
JH		 3928 if (cmd_len < sizeof(*rsp))
3929 return -EPROTO;
3930
1da177e4
LT		 3931 scid = __le16_to_cpu(rsp->scid);
3932 dcid = __le16_to_cpu(rsp->dcid);
3933 result = __le16_to_cpu(rsp->result);
3934 status = __le16_to_cpu(rsp->status);
3935
1b009c98 3936 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3937 dcid, scid, result, status);
1da177e4 3938
3df91ea2
AE		 3939 mutex_lock(&conn->chan_lock);
3940
1da177e4 3941 if (scid) {
3df91ea2
AE		 3942 chan = __l2cap_get_chan_by_scid(conn, scid);
3943 if (!chan) {
21870b52 3944 err = -EBADSLT;
3df91ea2
AE		 3945 goto unlock;
3946 }
1da177e4 3947 } else {
3df91ea2
AE		 3948 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3949 if (!chan) {
21870b52 3950 err = -EBADSLT;
3df91ea2
AE		 3951 goto unlock;
3952 }
1da177e4
LT		 3953 }
3954
3df91ea2
AE		 3955 err = 0;
3956
6be36555 3957 l2cap_chan_lock(chan);
48454079 3958
1da177e4
LT		 3959 switch (result) {
3960 case L2CAP_CR_SUCCESS:
89bc500e 3961 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3962 chan->ident = 0;
fe4128e0 3963 chan->dcid = dcid;
c1360a1c 3964 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3965
c1360a1c 3966 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3967 break;
3968
1da177e4 3969 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3970 l2cap_build_conf_req(chan, req), req);
73ffa904 3971 chan->num_conf_req++;
1da177e4
LT		 3972 break;
3973
3974 case L2CAP_CR_PEND:
c1360a1c 3975 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3976 break;
3977
3978 default:
48454079 3979 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3980 break;
3981 }
3982
6be36555 3983 l2cap_chan_unlock(chan);
3df91ea2
AE		 3984
3985unlock:
3986 mutex_unlock(&conn->chan_lock);
3987
3988 return err;
1da177e4
LT		 3989}
3990
47d1ec61 3991static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3992{
3993 /* FCS is enabled only in ERTM or streaming mode, if one or both
3994 * sides request it.
3995 */
0c1bc5c6 3996 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3997 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3998 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3999 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 4000}
4001
29d8a590
AE		 4002static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
4003 u8 ident, u16 flags)
4004{
4005 struct l2cap_conn *conn = chan->conn;
4006
4007 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
4008 flags);
4009
4010 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
4011 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
4012
4013 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4014 l2cap_build_conf_rsp(chan, data,
4015 L2CAP_CONF_SUCCESS, flags), data);
4016}
4017
662d652d
JH		 4018static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4019 u16 scid, u16 dcid)
4020{
4021 struct l2cap_cmd_rej_cid rej;
4022
dcf4adbf 4023 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
662d652d
JH		 4024 rej.scid = __cpu_to_le16(scid);
4025 rej.dcid = __cpu_to_le16(dcid);
4026
4027 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4028}
4029
2d792818
GP		 4030static inline int l2cap_config_req(struct l2cap_conn *conn,
4031 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4032 u8 *data)
1da177e4
LT		 4033{
4034 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4035 u16 dcid, flags;
4036 u8 rsp[64];
48454079 4037 struct l2cap_chan *chan;
3c588192 4038 int len, err = 0;
1da177e4 4039
cb3b3152
JH		 4040 if (cmd_len < sizeof(*req))
4041 return -EPROTO;
4042
1da177e4
LT		 4043 dcid = __le16_to_cpu(req->dcid);
4044 flags = __le16_to_cpu(req->flags);
4045
4046 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4047
baa7e1fa 4048 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4049 if (!chan) {
4050 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4051 return 0;
4052 }
1da177e4 4053
033b1142 4054 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4055 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4056 chan->dcid);
354f60a9 4057 goto unlock;
df6bd743 4058 }
354f60a9 4059
5dee9e7c 4060 /* Reject if config buffer is too small. */
88219a0f 4061 len = cmd_len - sizeof(*req);
cb3b3152 4062 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4063 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4064 l2cap_build_conf_rsp(chan, rsp,
4065 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4066 goto unlock;
4067 }
4068
4069 /* Store config. */
73ffa904
GP		 4070 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4071 chan->conf_len += len;
1da177e4 4072
59e54bd1 4073 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4074 /* Incomplete config. Send empty response. */
4075 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4076 l2cap_build_conf_rsp(chan, rsp,
4077 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4078 goto unlock;
4079 }
4080
4081 /* Complete config. */
73ffa904 4082 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4083 if (len < 0) {
5e4e3972 4084 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4085 goto unlock;
f2fcfcd6 4086 }
1da177e4 4087
1500109b 4088 chan->ident = cmd->ident;
5dee9e7c 4089 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4090 chan->num_conf_rsp++;
5dee9e7c 4091
5dee9e7c 4092 /* Reset config buffer. */
73ffa904 4093 chan->conf_len = 0;
5dee9e7c 4094
c1360a1c 4095 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4096 goto unlock;
4097
c1360a1c 4098 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4099 set_default_fcs(chan);
fcc203c3 4100
105bdf9e
MM		 4101 if (chan->mode == L2CAP_MODE_ERTM ||
4102 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4103 err = l2cap_ertm_init(chan);
4104
4105 if (err < 0)
5e4e3972 4106 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4107 else
4108 l2cap_chan_ready(chan);
0565c1c2 4109
876d9484
MH		 4110 goto unlock;
4111 }
4112
c1360a1c 4113 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4114 u8 buf[64];
1da177e4 4115 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4116 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4117 chan->num_conf_req++;
1da177e4
LT		 4118 }
4119
49c922bb 4120 /* Got Conf Rsp PENDING from remote side and assume we sent
0e8b207e
AE		 4121 Conf Rsp PENDING in the code above */
4122 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4123 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4124
4125 /* check compatibility */
4126
79de886d 4127 /* Send rsp for BR/EDR channel */
f351bc72 4128 if (!chan->hs_hcon)
79de886d
AE		 4129 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4130 else
4131 chan->ident = cmd->ident;
0e8b207e
AE		 4132 }
4133
1da177e4 4134unlock:
6be36555 4135 l2cap_chan_unlock(chan);
3c588192 4136 return err;
1da177e4
LT		 4137}
4138
2d792818 4139static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4140 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4141 u8 *data)
1da177e4
LT		 4142{
4143 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4144 u16 scid, flags, result;
48454079 4145 struct l2cap_chan *chan;
cb3b3152 4146 int len = cmd_len - sizeof(*rsp);
3c588192 4147 int err = 0;
1da177e4 4148
cb3b3152
JH		 4149 if (cmd_len < sizeof(*rsp))
4150 return -EPROTO;
4151
1da177e4
LT		 4152 scid = __le16_to_cpu(rsp->scid);
4153 flags = __le16_to_cpu(rsp->flags);
4154 result = __le16_to_cpu(rsp->result);
4155
61386cba
AE		 4156 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4157 result, len);
1da177e4 4158
baa7e1fa 4159 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4160 if (!chan)
1da177e4
LT		 4161 return 0;
4162
4163 switch (result) {
4164 case L2CAP_CONF_SUCCESS:
47d1ec61 4165 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4166 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4167 break;
4168
0e8b207e
AE		 4169 case L2CAP_CONF_PENDING:
4170 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4171
4172 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4173 char buf[64];
4174
4175 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4176 buf, &result);
0e8b207e 4177 if (len < 0) {
5e4e3972 4178 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4179 goto done;
4180 }
4181
f351bc72 4182 if (!chan->hs_hcon) {
79de886d
AE		 4183 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4184 0);
5ce66b59
AE		 4185 } else {
4186 if (l2cap_check_efs(chan)) {
4187 amp_create_logical_link(chan);
4188 chan->ident = cmd->ident;
4189 }
4190 }
0e8b207e
AE		 4191 }
4192 goto done;
4193
1da177e4 4194 case L2CAP_CONF_UNACCEPT:
73ffa904 4195 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4196 char req[64];
4197
c2c77ec8 4198 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4199 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4200 goto done;
4201 }
4202
f2fcfcd6
GP		 4203 /* throw out any old stored conf requests */
4204 result = L2CAP_CONF_SUCCESS;
b4450035 4205 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4206 req, &result);
f2fcfcd6 4207 if (len < 0) {
5e4e3972 4208 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4209 goto done;
4210 }
4211
4212 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4213 L2CAP_CONF_REQ, len, req);
73ffa904 4214 chan->num_conf_req++;
f2fcfcd6
GP		 4215 if (result != L2CAP_CONF_SUCCESS)
4216 goto done;
4217 break;
1da177e4
LT		 4218 }
4219
8e87d142 4220 default:
6be36555 4221 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4222
ba13ccd9 4223 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4224 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4225 goto done;
4226 }
4227
59e54bd1 4228 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4229 goto done;
4230
c1360a1c 4231 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4232
c1360a1c 4233 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4234 set_default_fcs(chan);
fcc203c3 4235
105bdf9e
MM		 4236 if (chan->mode == L2CAP_MODE_ERTM ||
4237 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4238 err = l2cap_ertm_init(chan);
0565c1c2 4239
3c588192 4240 if (err < 0)
5e4e3972 4241 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4242 else
4243 l2cap_chan_ready(chan);
1da177e4
LT		 4244 }
4245
4246done:
6be36555 4247 l2cap_chan_unlock(chan);
3c588192 4248 return err;
1da177e4
LT		 4249}
4250
2d792818 4251static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4252 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4253 u8 *data)
1da177e4
LT		 4254{
4255 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4256 struct l2cap_disconn_rsp rsp;
4257 u16 dcid, scid;
48454079 4258 struct l2cap_chan *chan;
1da177e4 4259
cb3b3152
JH		 4260 if (cmd_len != sizeof(*req))
4261 return -EPROTO;
4262
1da177e4
LT		 4263 scid = __le16_to_cpu(req->scid);
4264 dcid = __le16_to_cpu(req->dcid);
4265
4266 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4267
3df91ea2
AE		 4268 mutex_lock(&conn->chan_lock);
4269
4270 chan = __l2cap_get_chan_by_scid(conn, dcid);
4271 if (!chan) {
4272 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4273 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4274 return 0;
3df91ea2 4275 }
1da177e4 4276
6be36555
AE		 4277 l2cap_chan_lock(chan);
4278
fe4128e0
GP		 4279 rsp.dcid = cpu_to_le16(chan->scid);
4280 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4281 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4282
5ec1bbe5 4283 chan->ops->set_shutdown(chan);
1da177e4 4284
61d6ef3e 4285 l2cap_chan_hold(chan);
48454079 4286 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4287
4288 l2cap_chan_unlock(chan);
1da177e4 4289
80b98027 4290 chan->ops->close(chan);
61d6ef3e 4291 l2cap_chan_put(chan);
3df91ea2
AE		 4292
4293 mutex_unlock(&conn->chan_lock);
4294
1da177e4
LT		 4295 return 0;
4296}
4297
2d792818 4298static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4299 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4300 u8 *data)
1da177e4
LT		 4301{
4302 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4303 u16 dcid, scid;
48454079 4304 struct l2cap_chan *chan;
1da177e4 4305
cb3b3152
JH		 4306 if (cmd_len != sizeof(*rsp))
4307 return -EPROTO;
4308
1da177e4
LT		 4309 scid = __le16_to_cpu(rsp->scid);
4310 dcid = __le16_to_cpu(rsp->dcid);
4311
4312 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4313
3df91ea2
AE		 4314 mutex_lock(&conn->chan_lock);
4315
4316 chan = __l2cap_get_chan_by_scid(conn, scid);
4317 if (!chan) {
4318 mutex_unlock(&conn->chan_lock);
1da177e4 4319 return 0;
3df91ea2 4320 }
1da177e4 4321
6be36555 4322 l2cap_chan_lock(chan);
48454079 4323
61d6ef3e 4324 l2cap_chan_hold(chan);
48454079 4325 l2cap_chan_del(chan, 0);
6be36555
AE		 4326
4327 l2cap_chan_unlock(chan);
1da177e4 4328
80b98027 4329 chan->ops->close(chan);
61d6ef3e 4330 l2cap_chan_put(chan);
3df91ea2
AE		 4331
4332 mutex_unlock(&conn->chan_lock);
4333
1da177e4
LT		 4334 return 0;
4335}
4336
2d792818 4337static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4338 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4339 u8 *data)
1da177e4
LT		 4340{
4341 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4342 u16 type;
4343
cb3b3152
JH		 4344 if (cmd_len != sizeof(*req))
4345 return -EPROTO;
4346
1da177e4
LT		 4347 type = __le16_to_cpu(req->type);
4348
4349 BT_DBG("type 0x%4.4x", type);
4350
f0709e03
MH		 4351 if (type == L2CAP_IT_FEAT_MASK) {
4352 u8 buf[8];
44dd46de 4353 u32 feat_mask = l2cap_feat_mask;
f0709e03 4354 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
dcf4adbf
JP		 4355 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4356 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4357 if (!disable_ertm)
fcc203c3 4358 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4359 | L2CAP_FEAT_FCS;
0bd49fc7 4360 if (conn->local_fixed_chan & L2CAP_FC_A2MP)
6327eb98 4361 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4362 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4363
1b7bf4ed 4364 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4365 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4366 buf);
e1027a7c
MH		 4367 } else if (type == L2CAP_IT_FIXED_CHAN) {
4368 u8 buf[12];
4369 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4370
dcf4adbf
JP		 4371 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4372 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
0bd49fc7
JH		 4373 rsp->data[0] = conn->local_fixed_chan;
4374 memset(rsp->data + 1, 0, 7);
2d792818
GP		 4375 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4376 buf);
f0709e03
MH		 4377 } else {
4378 struct l2cap_info_rsp rsp;
4379 rsp.type = cpu_to_le16(type);
dcf4adbf 4380 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4381 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4382 &rsp);
f0709e03 4383 }
1da177e4
LT		 4384
4385 return 0;
4386}
4387
2d792818 4388static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4389 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4390 u8 *data)
1da177e4
LT		 4391{
4392 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4393 u16 type, result;
4394
3f6fa3d4 4395 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4396 return -EPROTO;
4397
1da177e4
LT		 4398 type = __le16_to_cpu(rsp->type);
4399 result = __le16_to_cpu(rsp->result);
4400
4401 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4402
e90165be
AE		 4403 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4404 if (cmd->ident != conn->info_ident ||
2d792818 4405 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4406 return 0;
4407
17cd3f37 4408 cancel_delayed_work(&conn->info_timer);
4e8402a3 4409
adb08ede
VT		 4410 if (result != L2CAP_IR_SUCCESS) {
4411 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4412 conn->info_ident = 0;
4413
4414 l2cap_conn_start(conn);
4415
4416 return 0;
4417 }
4418
978c93b9
AE		 4419 switch (type) {
4420 case L2CAP_IT_FEAT_MASK:
83985319 4421 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4422
47ec1dcd 4423 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4424 struct l2cap_info_req req;
dcf4adbf 4425 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4426
4427 conn->info_ident = l2cap_get_ident(conn);
4428
4429 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4430 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4431 } else {
4432 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4433 conn->info_ident = 0;
4434
4435 l2cap_conn_start(conn);
4436 }
978c93b9
AE		 4437 break;
4438
4439 case L2CAP_IT_FIXED_CHAN:
0bd49fc7 4440 conn->remote_fixed_chan = rsp->data[0];
984947dc 4441 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4442 conn->info_ident = 0;
984947dc
MH		 4443
4444 l2cap_conn_start(conn);
978c93b9 4445 break;
984947dc 4446 }
4e8402a3 4447
1da177e4
LT		 4448 return 0;
4449}
4450
1700915f
MM		 4451static int l2cap_create_channel_req(struct l2cap_conn *conn,
4452 struct l2cap_cmd_hdr *cmd,
4453 u16 cmd_len, void *data)
f94ff6ff
MM		 4454{
4455 struct l2cap_create_chan_req *req = data;
6e1df6a6 4456 struct l2cap_create_chan_rsp rsp;
1700915f 4457 struct l2cap_chan *chan;
6e1df6a6 4458 struct hci_dev *hdev;
f94ff6ff
MM		 4459 u16 psm, scid;
4460
4461 if (cmd_len != sizeof(*req))
4462 return -EPROTO;
4463
0bd49fc7 4464 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
f94ff6ff
MM		 4465 return -EINVAL;
4466
4467 psm = le16_to_cpu(req->psm);
4468 scid = le16_to_cpu(req->scid);
4469
ad0ac6ca 4470 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4471
6e1df6a6 4472 /* For controller id 0 make BR/EDR connection */
6ed971ca 4473 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4474 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4475 req->amp_id);
4476 return 0;
4477 }
1700915f 4478
6e1df6a6
AE		 4479 /* Validate AMP controller id */
4480 hdev = hci_dev_get(req->amp_id);
4481 if (!hdev)
4482 goto error;
1700915f 4483
6e1df6a6
AE		 4484 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4485 hci_dev_put(hdev);
4486 goto error;
4487 }
1700915f 4488
6e1df6a6
AE		 4489 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4490 req->amp_id);
4491 if (chan) {
4492 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4493 struct hci_conn *hs_hcon;
1700915f 4494
98e0f7ea
MH		 4495 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4496 &conn->hcon->dst);
6e1df6a6
AE		 4497 if (!hs_hcon) {
4498 hci_dev_put(hdev);
662d652d
JH		 4499 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4500 chan->dcid);
4501 return 0;
1700915f
MM		 4502 }
4503
6e1df6a6
AE		 4504 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4505
6e1df6a6
AE		 4506 mgr->bredr_chan = chan;
4507 chan->hs_hcon = hs_hcon;
fd45bf4c 4508 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4509 conn->mtu = hdev->block_mtu;
1700915f 4510 }
f94ff6ff 4511
6e1df6a6 4512 hci_dev_put(hdev);
f94ff6ff
MM		 4513
4514 return 0;
6e1df6a6
AE		 4515
4516error:
4517 rsp.dcid = 0;
4518 rsp.scid = cpu_to_le16(scid);
dcf4adbf
JP		 4519 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4520 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
6e1df6a6
AE		 4521
4522 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4523 sizeof(rsp), &rsp);
4524
dc280801 4525 return 0;
f94ff6ff
MM		 4526}
4527
8eb200bd
MM		 4528static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4529{
4530 struct l2cap_move_chan_req req;
4531 u8 ident;
4532
4533 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4534
4535 ident = l2cap_get_ident(chan->conn);
4536 chan->ident = ident;
4537
4538 req.icid = cpu_to_le16(chan->scid);
4539 req.dest_amp_id = dest_amp_id;
4540
4541 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4542 &req);
4543
4544 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4545}
4546
1500109b 4547static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4548{
4549 struct l2cap_move_chan_rsp rsp;
4550
1500109b 4551 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4552
1500109b 4553 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4554 rsp.result = cpu_to_le16(result);
4555
1500109b
MM		 4556 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4557 sizeof(rsp), &rsp);
8d5a04a1
MM		 4558}
4559
5b155ef9 4560static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4561{
4562 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4563
5b155ef9 4564 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4565
5b155ef9 4566 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4567
5b155ef9 4568 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4569 cfm.result = cpu_to_le16(result);
4570
5b155ef9
MM		 4571 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4572 sizeof(cfm), &cfm);
4573
4574 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4575}
4576
4577static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4578{
4579 struct l2cap_move_chan_cfm cfm;
4580
4581 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4582
4583 cfm.icid = cpu_to_le16(icid);
dcf4adbf 4584 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
5b155ef9
MM		 4585
4586 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4587 sizeof(cfm), &cfm);
8d5a04a1
MM		 4588}
4589
4590static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4591 u16 icid)
8d5a04a1
MM		 4592{
4593 struct l2cap_move_chan_cfm_rsp rsp;
4594
ad0ac6ca 4595 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4596
4597 rsp.icid = cpu_to_le16(icid);
4598 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4599}
4600
5f3847a4
MM		 4601static void __release_logical_link(struct l2cap_chan *chan)
4602{
4603 chan->hs_hchan = NULL;
4604 chan->hs_hcon = NULL;
4605
4606 /* Placeholder - release the logical link */
4607}
4608
1500109b
MM		 4609static void l2cap_logical_fail(struct l2cap_chan *chan)
4610{
4611 /* Logical link setup failed */
4612 if (chan->state != BT_CONNECTED) {
4613 /* Create channel failure, disconnect */
5e4e3972 4614 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4615 return;
4616 }
4617
4618 switch (chan->move_role) {
4619 case L2CAP_MOVE_ROLE_RESPONDER:
4620 l2cap_move_done(chan);
4621 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4622 break;
4623 case L2CAP_MOVE_ROLE_INITIATOR:
4624 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4625 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4626 /* Remote has only sent pending or
4627 * success responses, clean up
4628 */
4629 l2cap_move_done(chan);
4630 }
4631
4632 /* Other amp move states imply that the move
4633 * has already aborted
4634 */
4635 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4636 break;
4637 }
4638}
4639
4640static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4641 struct hci_chan *hchan)
4642{
4643 struct l2cap_conf_rsp rsp;
1500109b 4644
336178a3 4645 chan->hs_hchan = hchan;
1500109b
MM		 4646 chan->hs_hcon->l2cap_data = chan->conn;
4647
35ba9561 4648 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4649
4650 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4651 int err;
1500109b
MM		 4652
4653 set_default_fcs(chan);
4654
4655 err = l2cap_ertm_init(chan);
4656 if (err < 0)
5e4e3972 4657 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4658 else
4659 l2cap_chan_ready(chan);
4660 }
4661}
4662
4663static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4664 struct hci_chan *hchan)
4665{
4666 chan->hs_hcon = hchan->conn;
4667 chan->hs_hcon->l2cap_data = chan->conn;
4668
4669 BT_DBG("move_state %d", chan->move_state);
4670
4671 switch (chan->move_state) {
4672 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4673 /* Move confirm will be sent after a success
4674 * response is received
4675 */
4676 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4677 break;
4678 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4679 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4680 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4681 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4682 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4683 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4684 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4685 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4686 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4687 }
4688 break;
4689 default:
4690 /* Move was not in expected state, free the channel */
4691 __release_logical_link(chan);
4692
4693 chan->move_state = L2CAP_MOVE_STABLE;
4694 }
4695}
4696
4697/* Call with chan locked */
27695fb4
AE		 4698void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4699 u8 status)
5b155ef9 4700{
1500109b
MM		 4701 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4702
4703 if (status) {
4704 l2cap_logical_fail(chan);
4705 __release_logical_link(chan);
4706 return;
4707 }
4708
4709 if (chan->state != BT_CONNECTED) {
4710 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4711 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4712 l2cap_logical_finish_create(chan, hchan);
4713 } else {
4714 l2cap_logical_finish_move(chan, hchan);
4715 }
5b155ef9
MM		 4716}
4717
3f7a56c4
MM		 4718void l2cap_move_start(struct l2cap_chan *chan)
4719{
4720 BT_DBG("chan %p", chan);
4721
6ed971ca 4722 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4723 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4724 return;
4725 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4726 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4727 /* Placeholder - start physical link setup */
4728 } else {
4729 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4730 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4731 chan->move_id = 0;
4732 l2cap_move_setup(chan);
4733 l2cap_send_move_chan_req(chan, 0);
4734 }
4735}
4736
8eb200bd
MM		 4737static void l2cap_do_create(struct l2cap_chan *chan, int result,
4738 u8 local_amp_id, u8 remote_amp_id)
4739{
62748ca1
AE		 4740 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4741 local_amp_id, remote_amp_id);
4742
12d6cc60
AE		 4743 chan->fcs = L2CAP_FCS_NONE;
4744
62748ca1
AE		 4745 /* Outgoing channel on AMP */
4746 if (chan->state == BT_CONNECT) {
4747 if (result == L2CAP_CR_SUCCESS) {
4748 chan->local_amp_id = local_amp_id;
4749 l2cap_send_create_chan_req(chan, remote_amp_id);
4750 } else {
4751 /* Revert to BR/EDR connect */
4752 l2cap_send_conn_req(chan);
4753 }
4754
4755 return;
4756 }
4757
4758 /* Incoming channel on AMP */
4759 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4760 struct l2cap_conn_rsp rsp;
4761 char buf[128];
4762 rsp.scid = cpu_to_le16(chan->dcid);
4763 rsp.dcid = cpu_to_le16(chan->scid);
4764
8eb200bd
MM		 4765 if (result == L2CAP_CR_SUCCESS) {
4766 /* Send successful response */
dcf4adbf
JP		 4767 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4768 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4769 } else {
4770 /* Send negative response */
dcf4adbf
JP		 4771 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4772 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4773 }
4774
4775 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4776 sizeof(rsp), &rsp);
4777
4778 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4779 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4780 set_bit(CONF_REQ_SENT, &chan->conf_state);
4781 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4782 L2CAP_CONF_REQ,
4783 l2cap_build_conf_req(chan, buf), buf);
4784 chan->num_conf_req++;
4785 }
8eb200bd
MM		 4786 }
4787}
4788
4789static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4790 u8 remote_amp_id)
4791{
4792 l2cap_move_setup(chan);
4793 chan->move_id = local_amp_id;
4794 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4795
4796 l2cap_send_move_chan_req(chan, remote_amp_id);
4797}
4798
4799static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4800{
4801 struct hci_chan *hchan = NULL;
4802
4803 /* Placeholder - get hci_chan for logical link */
4804
4805 if (hchan) {
4806 if (hchan->state == BT_CONNECTED) {
4807 /* Logical link is ready to go */
4808 chan->hs_hcon = hchan->conn;
4809 chan->hs_hcon->l2cap_data = chan->conn;
4810 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4811 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4812
4813 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4814 } else {
4815 /* Wait for logical link to be ready */
4816 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4817 }
4818 } else {
4819 /* Logical link not available */
4820 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4821 }
4822}
4823
4824static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4825{
4826 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4827 u8 rsp_result;
4828 if (result == -EINVAL)
4829 rsp_result = L2CAP_MR_BAD_ID;
4830 else
4831 rsp_result = L2CAP_MR_NOT_ALLOWED;
4832
4833 l2cap_send_move_chan_rsp(chan, rsp_result);
4834 }
4835
4836 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4837 chan->move_state = L2CAP_MOVE_STABLE;
4838
4839 /* Restart data transmission */
4840 l2cap_ertm_send(chan);
4841}
4842
a514b17f
AE		 4843/* Invoke with locked chan */
4844void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4845{
770bfefa 4846 u8 local_amp_id = chan->local_amp_id;
fffadc08 4847 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4848
8eb200bd
MM		 4849 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4850 chan, result, local_amp_id, remote_amp_id);
4851
8eb200bd
MM		 4852 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4853 l2cap_chan_unlock(chan);
4854 return;
4855 }
4856
4857 if (chan->state != BT_CONNECTED) {
4858 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4859 } else if (result != L2CAP_MR_SUCCESS) {
4860 l2cap_do_move_cancel(chan, result);
4861 } else {
4862 switch (chan->move_role) {
4863 case L2CAP_MOVE_ROLE_INITIATOR:
4864 l2cap_do_move_initiate(chan, local_amp_id,
4865 remote_amp_id);
4866 break;
4867 case L2CAP_MOVE_ROLE_RESPONDER:
4868 l2cap_do_move_respond(chan, result);
4869 break;
4870 default:
4871 l2cap_do_move_cancel(chan, result);
4872 break;
4873 }
4874 }
8eb200bd
MM		 4875}
4876
8d5a04a1 4877static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4878 struct l2cap_cmd_hdr *cmd,
4879 u16 cmd_len, void *data)
8d5a04a1
MM		 4880{
4881 struct l2cap_move_chan_req *req = data;
1500109b 4882 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4883 struct l2cap_chan *chan;
8d5a04a1
MM		 4884 u16 icid = 0;
4885 u16 result = L2CAP_MR_NOT_ALLOWED;
4886
4887 if (cmd_len != sizeof(*req))
4888 return -EPROTO;
4889
4890 icid = le16_to_cpu(req->icid);
4891
ad0ac6ca 4892 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4893
0bd49fc7 4894 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
8d5a04a1
MM		 4895 return -EINVAL;
4896
02b0fbb9
MM		 4897 chan = l2cap_get_chan_by_dcid(conn, icid);
4898 if (!chan) {
1500109b 4899 rsp.icid = cpu_to_le16(icid);
dcf4adbf 4900 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
1500109b
MM		 4901 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4902 sizeof(rsp), &rsp);
02b0fbb9
MM		 4903 return 0;
4904 }
4905
1500109b
MM		 4906 chan->ident = cmd->ident;
4907
02b0fbb9
MM		 4908 if (chan->scid < L2CAP_CID_DYN_START ||
4909 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4910 (chan->mode != L2CAP_MODE_ERTM &&
4911 chan->mode != L2CAP_MODE_STREAMING)) {
4912 result = L2CAP_MR_NOT_ALLOWED;
4913 goto send_move_response;
4914 }
4915
4916 if (chan->local_amp_id == req->dest_amp_id) {
4917 result = L2CAP_MR_SAME_ID;
4918 goto send_move_response;
4919 }
4920
6ed971ca 4921 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4922 struct hci_dev *hdev;
4923 hdev = hci_dev_get(req->dest_amp_id);
4924 if (!hdev || hdev->dev_type != HCI_AMP ||
4925 !test_bit(HCI_UP, &hdev->flags)) {
4926 if (hdev)
4927 hci_dev_put(hdev);
4928
4929 result = L2CAP_MR_BAD_ID;
4930 goto send_move_response;
4931 }
4932 hci_dev_put(hdev);
4933 }
4934
4935 /* Detect a move collision. Only send a collision response
4936 * if this side has "lost", otherwise proceed with the move.
4937 * The winner has the larger bd_addr.
4938 */
4939 if ((__chan_is_moving(chan) ||
4940 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4941 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4942 result = L2CAP_MR_COLLISION;
4943 goto send_move_response;
4944 }
4945
02b0fbb9
MM		 4946 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4947 l2cap_move_setup(chan);
4948 chan->move_id = req->dest_amp_id;
4949 icid = chan->dcid;
4950
6ed971ca 4951 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4952 /* Moving to BR/EDR */
4953 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4954 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4955 result = L2CAP_MR_PEND;
4956 } else {
4957 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4958 result = L2CAP_MR_SUCCESS;
4959 }
4960 } else {
4961 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4962 /* Placeholder - uncomment when amp functions are available */
4963 /*amp_accept_physical(chan, req->dest_amp_id);*/
4964 result = L2CAP_MR_PEND;
4965 }
4966
4967send_move_response:
1500109b 4968 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4969
02b0fbb9
MM		 4970 l2cap_chan_unlock(chan);
4971
8d5a04a1
MM		 4972 return 0;
4973}
4974
5b155ef9
MM		 4975static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4976{
4977 struct l2cap_chan *chan;
4978 struct hci_chan *hchan = NULL;
4979
4980 chan = l2cap_get_chan_by_scid(conn, icid);
4981 if (!chan) {
4982 l2cap_send_move_chan_cfm_icid(conn, icid);
4983 return;
4984 }
4985
4986 __clear_chan_timer(chan);
4987 if (result == L2CAP_MR_PEND)
4988 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4989
4990 switch (chan->move_state) {
4991 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4992 /* Move confirm will be sent when logical link
4993 * is complete.
4994 */
4995 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4996 break;
4997 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4998 if (result == L2CAP_MR_PEND) {
4999 break;
5000 } else if (test_bit(CONN_LOCAL_BUSY,
5001 &chan->conn_state)) {
5002 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
5003 } else {
5004 /* Logical link is up or moving to BR/EDR,
5005 * proceed with move
5006 */
5007 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
5008 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5009 }
5010 break;
5011 case L2CAP_MOVE_WAIT_RSP:
5012 /* Moving to AMP */
5013 if (result == L2CAP_MR_SUCCESS) {
5014 /* Remote is ready, send confirm immediately
5015 * after logical link is ready
5016 */
5017 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5018 } else {
5019 /* Both logical link and move success
5020 * are required to confirm
5021 */
5022 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5023 }
5024
5025 /* Placeholder - get hci_chan for logical link */
5026 if (!hchan) {
5027 /* Logical link not available */
5028 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5029 break;
5030 }
5031
5032 /* If the logical link is not yet connected, do not
5033 * send confirmation.
5034 */
5035 if (hchan->state != BT_CONNECTED)
5036 break;
5037
5038 /* Logical link is already ready to go */
5039
5040 chan->hs_hcon = hchan->conn;
5041 chan->hs_hcon->l2cap_data = chan->conn;
5042
5043 if (result == L2CAP_MR_SUCCESS) {
5044 /* Can confirm now */
5045 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5046 } else {
5047 /* Now only need move success
5048 * to confirm
5049 */
5050 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5051 }
5052
5053 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5054 break;
5055 default:
5056 /* Any other amp move state means the move failed. */
5057 chan->move_id = chan->local_amp_id;
5058 l2cap_move_done(chan);
5059 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5060 }
5061
5062 l2cap_chan_unlock(chan);
5063}
5064
5065static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5066 u16 result)
5067{
5068 struct l2cap_chan *chan;
5069
5070 chan = l2cap_get_chan_by_ident(conn, ident);
5071 if (!chan) {
5072 /* Could not locate channel, icid is best guess */
5073 l2cap_send_move_chan_cfm_icid(conn, icid);
5074 return;
5075 }
5076
5077 __clear_chan_timer(chan);
5078
5079 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5080 if (result == L2CAP_MR_COLLISION) {
5081 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5082 } else {
5083 /* Cleanup - cancel move */
5084 chan->move_id = chan->local_amp_id;
5085 l2cap_move_done(chan);
5086 }
5087 }
5088
5089 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5090
5091 l2cap_chan_unlock(chan);
5092}
5093
5094static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5095 struct l2cap_cmd_hdr *cmd,
5096 u16 cmd_len, void *data)
8d5a04a1
MM		 5097{
5098 struct l2cap_move_chan_rsp *rsp = data;
5099 u16 icid, result;
5100
5101 if (cmd_len != sizeof(*rsp))
5102 return -EPROTO;
5103
5104 icid = le16_to_cpu(rsp->icid);
5105 result = le16_to_cpu(rsp->result);
5106
ad0ac6ca 5107 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5108
5b155ef9
MM		 5109 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5110 l2cap_move_continue(conn, icid, result);
5111 else
5112 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5113
5114 return 0;
5115}
5116
5f3847a4
MM		 5117static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5118 struct l2cap_cmd_hdr *cmd,
5119 u16 cmd_len, void *data)
8d5a04a1
MM		 5120{
5121 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5122 struct l2cap_chan *chan;
8d5a04a1
MM		 5123 u16 icid, result;
5124
5125 if (cmd_len != sizeof(*cfm))
5126 return -EPROTO;
5127
5128 icid = le16_to_cpu(cfm->icid);
5129 result = le16_to_cpu(cfm->result);
5130
ad0ac6ca 5131 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5132
5f3847a4
MM		 5133 chan = l2cap_get_chan_by_dcid(conn, icid);
5134 if (!chan) {
5135 /* Spec requires a response even if the icid was not found */
5136 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5137 return 0;
5138 }
5139
5140 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5141 if (result == L2CAP_MC_CONFIRMED) {
5142 chan->local_amp_id = chan->move_id;
6ed971ca 5143 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5144 __release_logical_link(chan);
5145 } else {
5146 chan->move_id = chan->local_amp_id;
5147 }
5148
5149 l2cap_move_done(chan);
5150 }
5151
8d5a04a1
MM		 5152 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5153
5f3847a4
MM		 5154 l2cap_chan_unlock(chan);
5155
8d5a04a1
MM		 5156 return 0;
5157}
5158
5159static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5160 struct l2cap_cmd_hdr *cmd,
5161 u16 cmd_len, void *data)
8d5a04a1
MM		 5162{
5163 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5164 struct l2cap_chan *chan;
8d5a04a1
MM		 5165 u16 icid;
5166
5167 if (cmd_len != sizeof(*rsp))
5168 return -EPROTO;
5169
5170 icid = le16_to_cpu(rsp->icid);
5171
ad0ac6ca 5172 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5173
3fd71a0a
MM		 5174 chan = l2cap_get_chan_by_scid(conn, icid);
5175 if (!chan)
5176 return 0;
5177
5178 __clear_chan_timer(chan);
5179
5180 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5181 chan->local_amp_id = chan->move_id;
5182
6ed971ca 5183 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5184 __release_logical_link(chan);
5185
5186 l2cap_move_done(chan);
5187 }
5188
5189 l2cap_chan_unlock(chan);
5190
8d5a04a1
MM		 5191 return 0;
5192}
5193
de73115a 5194static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5195 struct l2cap_cmd_hdr *cmd,
203e639e 5196 u16 cmd_len, u8 *data)
de73115a
CT		 5197{
5198 struct hci_conn *hcon = conn->hcon;
5199 struct l2cap_conn_param_update_req *req;
5200 struct l2cap_conn_param_update_rsp rsp;
203e639e 5201 u16 min, max, latency, to_multiplier;
2ce603eb 5202 int err;
de73115a 5203
40bef302 5204 if (hcon->role != HCI_ROLE_MASTER)
de73115a
CT		 5205 return -EINVAL;
5206
de73115a
CT		 5207 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5208 return -EPROTO;
5209
5210 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5211 min = __le16_to_cpu(req->min);
5212 max = __le16_to_cpu(req->max);
de73115a
CT		 5213 latency = __le16_to_cpu(req->latency);
5214 to_multiplier = __le16_to_cpu(req->to_multiplier);
5215
5216 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5217 min, max, latency, to_multiplier);
de73115a
CT		 5218
5219 memset(&rsp, 0, sizeof(rsp));
2ce603eb 5220
d4905f24 5221 err = hci_check_conn_params(min, max, latency, to_multiplier);
2ce603eb 5222 if (err)
dcf4adbf 5223 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5224 else
dcf4adbf 5225 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5226
5227 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5228 sizeof(rsp), &rsp);
de73115a 5229
ffb5a827 5230 if (!err) {
f4869e2a
JH		 5231 u8 store_hint;
5232
5233 store_hint = hci_le_conn_update(hcon, min, max, latency,
5234 to_multiplier);
ffb5a827 5235 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
f4869e2a
JH		 5236 store_hint, min, max, latency,
5237 to_multiplier);
ffb5a827 5238
ffb5a827 5239 }
2ce603eb 5240
de73115a
CT		 5241 return 0;
5242}
5243
f1496dee
JH		 5244static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5245 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5246 u8 *data)
5247{
5248 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
3e64b7bd 5249 struct hci_conn *hcon = conn->hcon;
f1496dee
JH		 5250 u16 dcid, mtu, mps, credits, result;
5251 struct l2cap_chan *chan;
3e64b7bd 5252 int err, sec_level;
f1496dee
JH		 5253
5254 if (cmd_len < sizeof(*rsp))
5255 return -EPROTO;
5256
5257 dcid = __le16_to_cpu(rsp->dcid);
5258 mtu = __le16_to_cpu(rsp->mtu);
5259 mps = __le16_to_cpu(rsp->mps);
5260 credits = __le16_to_cpu(rsp->credits);
5261 result = __le16_to_cpu(rsp->result);
5262
40624183
JH		 5263 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23 ||
5264 dcid < L2CAP_CID_DYN_START ||
5265 dcid > L2CAP_CID_LE_DYN_END))
f1496dee
JH		 5266 return -EPROTO;
5267
5268 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5269 dcid, mtu, mps, credits, result);
5270
5271 mutex_lock(&conn->chan_lock);
5272
5273 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5274 if (!chan) {
5275 err = -EBADSLT;
5276 goto unlock;
5277 }
5278
5279 err = 0;
5280
5281 l2cap_chan_lock(chan);
5282
5283 switch (result) {
5284 case L2CAP_CR_SUCCESS:
40624183
JH		 5285 if (__l2cap_get_chan_by_dcid(conn, dcid)) {
5286 err = -EBADSLT;
5287 break;
5288 }
5289
f1496dee
JH		 5290 chan->ident = 0;
5291 chan->dcid = dcid;
5292 chan->omtu = mtu;
5293 chan->remote_mps = mps;
0cd75f7e 5294 chan->tx_credits = credits;
f1496dee
JH		 5295 l2cap_chan_ready(chan);
5296 break;
5297
3e64b7bd
JH		 5298 case L2CAP_CR_AUTHENTICATION:
5299 case L2CAP_CR_ENCRYPTION:
5300 /* If we already have MITM protection we can't do
5301 * anything.
5302 */
5303 if (hcon->sec_level > BT_SECURITY_MEDIUM) {
5304 l2cap_chan_del(chan, ECONNREFUSED);
5305 break;
5306 }
5307
5308 sec_level = hcon->sec_level + 1;
5309 if (chan->sec_level < sec_level)
5310 chan->sec_level = sec_level;
5311
5312 /* We'll need to send a new Connect Request */
5313 clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags);
5314
5315 smp_conn_security(hcon, chan->sec_level);
5316 break;
5317
f1496dee
JH		 5318 default:
5319 l2cap_chan_del(chan, ECONNREFUSED);
5320 break;
5321 }
5322
5323 l2cap_chan_unlock(chan);
5324
5325unlock:
5326 mutex_unlock(&conn->chan_lock);
5327
5328 return err;
5329}
5330
3300d9a9 5331static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5332 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5333 u8 *data)
3300d9a9
CT		 5334{
5335 int err = 0;
5336
5337 switch (cmd->code) {
5338 case L2CAP_COMMAND_REJ:
cb3b3152 5339 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5340 break;
5341
5342 case L2CAP_CONN_REQ:
cb3b3152 5343 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5344 break;
5345
5346 case L2CAP_CONN_RSP:
f5a2598d 5347 case L2CAP_CREATE_CHAN_RSP:
9245e737 5348 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5349 break;
5350
5351 case L2CAP_CONF_REQ:
5352 err = l2cap_config_req(conn, cmd, cmd_len, data);
5353 break;
5354
5355 case L2CAP_CONF_RSP:
9245e737 5356 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5357 break;
5358
5359 case L2CAP_DISCONN_REQ:
cb3b3152 5360 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5361 break;
5362
5363 case L2CAP_DISCONN_RSP:
9245e737 5364 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5365 break;
5366
5367 case L2CAP_ECHO_REQ:
5368 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5369 break;
5370
5371 case L2CAP_ECHO_RSP:
5372 break;
5373
5374 case L2CAP_INFO_REQ:
cb3b3152 5375 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5376 break;
5377
5378 case L2CAP_INFO_RSP:
9245e737 5379 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5380 break;
5381
f94ff6ff
MM		 5382 case L2CAP_CREATE_CHAN_REQ:
5383 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5384 break;
5385
8d5a04a1
MM		 5386 case L2CAP_MOVE_CHAN_REQ:
5387 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5388 break;
5389
5390 case L2CAP_MOVE_CHAN_RSP:
9245e737 5391 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5392 break;
5393
5394 case L2CAP_MOVE_CHAN_CFM:
5395 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5396 break;
5397
5398 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5399 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5400 break;
5401
3300d9a9
CT		 5402 default:
5403 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5404 err = -EINVAL;
5405 break;
5406 }
5407
5408 return err;
5409}
5410
27e2d4c8
JH		 5411static int l2cap_le_connect_req(struct l2cap_conn *conn,
5412 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5413 u8 *data)
5414{
5415 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5416 struct l2cap_le_conn_rsp rsp;
5417 struct l2cap_chan *chan, *pchan;
0cd75f7e 5418 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5419 __le16 psm;
5420 u8 result;
5421
5422 if (cmd_len != sizeof(*req))
5423 return -EPROTO;
5424
5425 scid = __le16_to_cpu(req->scid);
5426 mtu = __le16_to_cpu(req->mtu);
5427 mps = __le16_to_cpu(req->mps);
5428 psm = req->psm;
5429 dcid = 0;
0cd75f7e 5430 credits = 0;
27e2d4c8
JH		 5431
5432 if (mtu < 23 || mps < 23)
5433 return -EPROTO;
5434
5435 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5436 scid, mtu, mps);
5437
5438 /* Check if we have socket listening on psm */
5439 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5440 &conn->hcon->dst, LE_LINK);
5441 if (!pchan) {
5442 result = L2CAP_CR_BAD_PSM;
5443 chan = NULL;
5444 goto response;
5445 }
5446
5447 mutex_lock(&conn->chan_lock);
5448 l2cap_chan_lock(pchan);
5449
35dc6f83
JH		 5450 if (!smp_sufficient_security(conn->hcon, pchan->sec_level,
5451 SMP_ALLOW_STK)) {
27e2d4c8
JH		 5452 result = L2CAP_CR_AUTHENTICATION;
5453 chan = NULL;
5454 goto response_unlock;
5455 }
5456
8a7889cc
JH		 5457 /* Check for valid dynamic CID range */
5458 if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) {
5459 result = L2CAP_CR_INVALID_SCID;
5460 chan = NULL;
5461 goto response_unlock;
5462 }
5463
27e2d4c8
JH		 5464 /* Check if we already have channel with that dcid */
5465 if (__l2cap_get_chan_by_dcid(conn, scid)) {
8a7889cc 5466 result = L2CAP_CR_SCID_IN_USE;
27e2d4c8
JH		 5467 chan = NULL;
5468 goto response_unlock;
5469 }
5470
5471 chan = pchan->ops->new_connection(pchan);
5472 if (!chan) {
5473 result = L2CAP_CR_NO_MEM;
5474 goto response_unlock;
5475 }
5476
0ce43ce6
JH		 5477 l2cap_le_flowctl_init(chan);
5478
27e2d4c8
JH		 5479 bacpy(&chan->src, &conn->hcon->src);
5480 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 5481 chan->src_type = bdaddr_src_type(conn->hcon);
5482 chan->dst_type = bdaddr_dst_type(conn->hcon);
27e2d4c8
JH		 5483 chan->psm = psm;
5484 chan->dcid = scid;
5485 chan->omtu = mtu;
5486 chan->remote_mps = mps;
0cd75f7e 5487 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5488
5489 __l2cap_chan_add(conn, chan);
5490 dcid = chan->scid;
0cd75f7e 5491 credits = chan->rx_credits;
27e2d4c8
JH		 5492
5493 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5494
5495 chan->ident = cmd->ident;
5496
5497 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5498 l2cap_state_change(chan, BT_CONNECT2);
434714dc
JH		 5499 /* The following result value is actually not defined
5500 * for LE CoC but we use it to let the function know
5501 * that it should bail out after doing its cleanup
5502 * instead of sending a response.
5503 */
27e2d4c8
JH		 5504 result = L2CAP_CR_PEND;
5505 chan->ops->defer(chan);
5506 } else {
5507 l2cap_chan_ready(chan);
5508 result = L2CAP_CR_SUCCESS;
5509 }
5510
5511response_unlock:
5512 l2cap_chan_unlock(pchan);
5513 mutex_unlock(&conn->chan_lock);
a24cce14 5514 l2cap_chan_put(pchan);
27e2d4c8
JH		 5515
5516 if (result == L2CAP_CR_PEND)
5517 return 0;
5518
5519response:
5520 if (chan) {
5521 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5522 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5523 } else {
5524 rsp.mtu = 0;
5525 rsp.mps = 0;
5526 }
5527
5528 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5529 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5530 rsp.result = cpu_to_le16(result);
5531
5532 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5533
5534 return 0;
5535}
5536
fad5fc89
JH		 5537static inline int l2cap_le_credits(struct l2cap_conn *conn,
5538 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5539 u8 *data)
5540{
5541 struct l2cap_le_credits *pkt;
5542 struct l2cap_chan *chan;
0f1bfe4e 5543 u16 cid, credits, max_credits;
fad5fc89
JH		 5544
5545 if (cmd_len != sizeof(*pkt))
5546 return -EPROTO;
5547
5548 pkt = (struct l2cap_le_credits *) data;
5549 cid = __le16_to_cpu(pkt->cid);
5550 credits = __le16_to_cpu(pkt->credits);
5551
5552 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5553
5554 chan = l2cap_get_chan_by_dcid(conn, cid);
5555 if (!chan)
5556 return -EBADSLT;
5557
0f1bfe4e
JH		 5558 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5559 if (credits > max_credits) {
5560 BT_ERR("LE credits overflow");
5561 l2cap_send_disconn_req(chan, ECONNRESET);
ee93053d 5562 l2cap_chan_unlock(chan);
0f1bfe4e
JH		 5563
5564 /* Return 0 so that we don't trigger an unnecessary
5565 * command reject packet.
5566 */
5567 return 0;
5568 }
5569
fad5fc89
JH		 5570 chan->tx_credits += credits;
5571
5572 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5573 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5574 chan->tx_credits--;
5575 }
5576
5577 if (chan->tx_credits)
5578 chan->ops->resume(chan);
5579
5580 l2cap_chan_unlock(chan);
5581
5582 return 0;
5583}
5584
71fb4197
JH		 5585static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5586 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5587 u8 *data)
5588{
5589 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5590 struct l2cap_chan *chan;
5591
5592 if (cmd_len < sizeof(*rej))
5593 return -EPROTO;
5594
5595 mutex_lock(&conn->chan_lock);
5596
5597 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5598 if (!chan)
5599 goto done;
5600
5601 l2cap_chan_lock(chan);
5602 l2cap_chan_del(chan, ECONNREFUSED);
5603 l2cap_chan_unlock(chan);
5604
5605done:
5606 mutex_unlock(&conn->chan_lock);
5607 return 0;
5608}
5609
3300d9a9 5610static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5611 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5612 u8 *data)
3300d9a9 5613{
b5ecba64
JH		 5614 int err = 0;
5615
3300d9a9
CT		 5616 switch (cmd->code) {
5617 case L2CAP_COMMAND_REJ:
71fb4197 5618 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5619 break;
3300d9a9
CT		 5620
5621 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5622 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5623 break;
3300d9a9
CT		 5624
5625 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5626 break;
3300d9a9 5627
f1496dee
JH		 5628 case L2CAP_LE_CONN_RSP:
5629 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5630 break;
f1496dee 5631
27e2d4c8 5632 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5633 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5634 break;
27e2d4c8 5635
fad5fc89
JH		 5636 case L2CAP_LE_CREDITS:
5637 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5638 break;
5639
3defe01a 5640 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5641 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5642 break;
3defe01a
JH		 5643
5644 case L2CAP_DISCONN_RSP:
5645 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5646 break;
3defe01a 5647
3300d9a9
CT		 5648 default:
5649 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5650 err = -EINVAL;
5651 break;
3300d9a9 5652 }
b5ecba64
JH		 5653
5654 return err;
3300d9a9
CT		 5655}
5656
c5623556
JH		 5657static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5658 struct sk_buff *skb)
5659{
69c4e4e8 5660 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5661 struct l2cap_cmd_hdr *cmd;
5662 u16 len;
c5623556
JH		 5663 int err;
5664
69c4e4e8 5665 if (hcon->type != LE_LINK)
3b166295 5666 goto drop;
69c4e4e8 5667
4f3e219d
MH		 5668 if (skb->len < L2CAP_CMD_HDR_SIZE)
5669 goto drop;
c5623556 5670
4f3e219d
MH		 5671 cmd = (void *) skb->data;
5672 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5673
4f3e219d 5674 len = le16_to_cpu(cmd->len);
c5623556 5675
4f3e219d 5676 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5677
4f3e219d
MH		 5678 if (len != skb->len || !cmd->ident) {
5679 BT_DBG("corrupted command");
5680 goto drop;
5681 }
c5623556 5682
203e639e 5683 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5684 if (err) {
5685 struct l2cap_cmd_rej_unk rej;
c5623556 5686
4f3e219d 5687 BT_ERR("Wrong link type (%d)", err);
c5623556 5688
dcf4adbf 5689 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5690 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5691 sizeof(rej), &rej);
c5623556
JH		 5692 }
5693
3b166295 5694drop:
c5623556
JH		 5695 kfree_skb(skb);
5696}
5697
3300d9a9 5698static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5699 struct sk_buff *skb)
1da177e4 5700{
69c4e4e8 5701 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5702 u8 *data = skb->data;
5703 int len = skb->len;
5704 struct l2cap_cmd_hdr cmd;
3300d9a9 5705 int err;
1da177e4
LT		 5706
5707 l2cap_raw_recv(conn, skb);
5708
69c4e4e8 5709 if (hcon->type != ACL_LINK)
3b166295 5710 goto drop;
69c4e4e8 5711
1da177e4 5712 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5713 u16 cmd_len;
1da177e4
LT		 5714 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5715 data += L2CAP_CMD_HDR_SIZE;
5716 len -= L2CAP_CMD_HDR_SIZE;
5717
88219a0f 5718 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5719
2d792818
GP		 5720 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5721 cmd.ident);
1da177e4 5722
88219a0f 5723 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5724 BT_DBG("corrupted command");
5725 break;
5726 }
5727
c5623556 5728 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5729 if (err) {
e2fd318e 5730 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5731
5732 BT_ERR("Wrong link type (%d)", err);
1da177e4 5733
dcf4adbf 5734 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5735 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5736 sizeof(rej), &rej);
1da177e4
LT		 5737 }
5738
88219a0f
AV		 5739 data += cmd_len;
5740 len -= cmd_len;
1da177e4
LT		 5741 }
5742
3b166295 5743drop:
1da177e4
LT		 5744 kfree_skb(skb);
5745}
5746
47d1ec61 5747static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5748{
5749 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5750 int hdr_size;
5751
5752 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5753 hdr_size = L2CAP_EXT_HDR_SIZE;
5754 else
5755 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5756
47d1ec61 5757 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5758 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5759 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5760 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5761
5762 if (our_fcs != rcv_fcs)
7a560e5c 5763 return -EBADMSG;
fcc203c3
GP		 5764 }
5765 return 0;
5766}
5767
6ea00485 5768static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5769{
e31f7633 5770 struct l2cap_ctrl control;
d5392c8f 5771
e31f7633 5772 BT_DBG("chan %p", chan);
d5392c8f 5773
e31f7633
MM		 5774 memset(&control, 0, sizeof(control));
5775 control.sframe = 1;
5776 control.final = 1;
5777 control.reqseq = chan->buffer_seq;
5778 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5779
e2ab4353 5780 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5781 control.super = L2CAP_SUPER_RNR;
5782 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5783 }
5784
e31f7633
MM		 5785 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5786 chan->unacked_frames > 0)
5787 __set_retrans_timer(chan);
d5392c8f 5788
e31f7633 5789 /* Send pending iframes */
525cd185 5790 l2cap_ertm_send(chan);
d5392c8f 5791
e2ab4353 5792 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5793 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5794 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5795 * send it now.
5796 */
5797 control.super = L2CAP_SUPER_RR;
5798 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5799 }
5800}
5801
2d792818
GP		 5802static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5803 struct sk_buff **last_frag)
18778a63 5804{
84084a31
MM		 5805 /* skb->len reflects data in skb as well as all fragments
5806 * skb->data_len reflects only data in fragments
5807 */
5808 if (!skb_has_frag_list(skb))
5809 skb_shinfo(skb)->frag_list = new_frag;
5810
5811 new_frag->next = NULL;
5812
5813 (*last_frag)->next = new_frag;
5814 *last_frag = new_frag;
5815
5816 skb->len += new_frag->len;
5817 skb->data_len += new_frag->len;
5818 skb->truesize += new_frag->truesize;
5819}
5820
4b51dae9
MM		 5821static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5822 struct l2cap_ctrl *control)
84084a31
MM		 5823{
5824 int err = -EINVAL;
18778a63 5825
4b51dae9 5826 switch (control->sar) {
7e0ef6ee 5827 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5828 if (chan->sdu)
5829 break;
18778a63 5830
80b98027 5831 err = chan->ops->recv(chan, skb);
84084a31 5832 break;
18778a63 5833
7e0ef6ee 5834 case L2CAP_SAR_START:
84084a31
MM		 5835 if (chan->sdu)
5836 break;
18778a63 5837
6f61fd47 5838 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5839 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5840
84084a31
MM		 5841 if (chan->sdu_len > chan->imtu) {
5842 err = -EMSGSIZE;
5843 break;
5844 }
1890d36b 5845
84084a31
MM		 5846 if (skb->len >= chan->sdu_len)
5847 break;
18778a63 5848
84084a31
MM		 5849 chan->sdu = skb;
5850 chan->sdu_last_frag = skb;
18778a63 5851
84084a31
MM		 5852 skb = NULL;
5853 err = 0;
18778a63
GP		 5854 break;
5855
7e0ef6ee 5856 case L2CAP_SAR_CONTINUE:
6f61fd47 5857 if (!chan->sdu)
84084a31 5858 break;
18778a63 5859
84084a31
MM		 5860 append_skb_frag(chan->sdu, skb,
5861 &chan->sdu_last_frag);
5862 skb = NULL;
18778a63 5863
84084a31
MM		 5864 if (chan->sdu->len >= chan->sdu_len)
5865 break;
4178ba46 5866
84084a31 5867 err = 0;
18778a63
GP		 5868 break;
5869
7e0ef6ee 5870 case L2CAP_SAR_END:
6f61fd47 5871 if (!chan->sdu)
84084a31 5872 break;
18778a63 5873
84084a31
MM		 5874 append_skb_frag(chan->sdu, skb,
5875 &chan->sdu_last_frag);
5876 skb = NULL;
4178ba46 5877
84084a31
MM		 5878 if (chan->sdu->len != chan->sdu_len)
5879 break;
18778a63 5880
80b98027 5881 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5882
84084a31
MM		 5883 if (!err) {
5884 /* Reassembly complete */
5885 chan->sdu = NULL;
5886 chan->sdu_last_frag = NULL;
5887 chan->sdu_len = 0;
1890d36b 5888 }
18778a63
GP		 5889 break;
5890 }
5891
84084a31
MM		 5892 if (err) {
5893 kfree_skb(skb);
5894 kfree_skb(chan->sdu);
5895 chan->sdu = NULL;
5896 chan->sdu_last_frag = NULL;
5897 chan->sdu_len = 0;
5898 }
18778a63 5899
84084a31 5900 return err;
18778a63
GP		 5901}
5902
32b32735
MM		 5903static int l2cap_resegment(struct l2cap_chan *chan)
5904{
5905 /* Placeholder */
5906 return 0;
5907}
5908
61aa4f5b 5909void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5910{
61aa4f5b 5911 u8 event;
712132eb 5912
61aa4f5b
MM		 5913 if (chan->mode != L2CAP_MODE_ERTM)
5914 return;
712132eb 5915
61aa4f5b 5916 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5917 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5918}
5919
d2a7ac5d
MM		 5920static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5921{
63838725
MM		 5922 int err = 0;
5923 /* Pass sequential frames to l2cap_reassemble_sdu()
5924 * until a gap is encountered.
5925 */
5926
5927 BT_DBG("chan %p", chan);
5928
5929 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5930 struct sk_buff *skb;
5931 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5932 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5933
5934 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5935
5936 if (!skb)
5937 break;
5938
5939 skb_unlink(skb, &chan->srej_q);
5940 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
a4368ff3 5941 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->l2cap);
63838725
MM		 5942 if (err)
5943 break;
5944 }
5945
5946 if (skb_queue_empty(&chan->srej_q)) {
5947 chan->rx_state = L2CAP_RX_STATE_RECV;
5948 l2cap_send_ack(chan);
5949 }
5950
5951 return err;
d2a7ac5d
MM		 5952}
5953
5954static void l2cap_handle_srej(struct l2cap_chan *chan,
5955 struct l2cap_ctrl *control)
5956{
f80842a8
MM		 5957 struct sk_buff *skb;
5958
5959 BT_DBG("chan %p, control %p", chan, control);
5960
5961 if (control->reqseq == chan->next_tx_seq) {
5962 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5963 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5964 return;
5965 }
5966
5967 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5968
5969 if (skb == NULL) {
5970 BT_DBG("Seq %d not available for retransmission",
5971 control->reqseq);
5972 return;
5973 }
5974
a4368ff3 5975 if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) {
f80842a8 5976 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5977 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5978 return;
5979 }
5980
5981 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5982
5983 if (control->poll) {
5984 l2cap_pass_to_tx(chan, control);
5985
5986 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5987 l2cap_retransmit(chan, control);
5988 l2cap_ertm_send(chan);
5989
5990 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5991 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5992 chan->srej_save_reqseq = control->reqseq;
5993 }
5994 } else {
5995 l2cap_pass_to_tx_fbit(chan, control);
5996
5997 if (control->final) {
5998 if (chan->srej_save_reqseq != control->reqseq ||
5999 !test_and_clear_bit(CONN_SREJ_ACT,
6000 &chan->conn_state))
6001 l2cap_retransmit(chan, control);
6002 } else {
6003 l2cap_retransmit(chan, control);
6004 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
6005 set_bit(CONN_SREJ_ACT, &chan->conn_state);
6006 chan->srej_save_reqseq = control->reqseq;
6007 }
6008 }
6009 }
d2a7ac5d
MM		 6010}
6011
6012static void l2cap_handle_rej(struct l2cap_chan *chan,
6013 struct l2cap_ctrl *control)
6014{
fcd289df
MM		 6015 struct sk_buff *skb;
6016
6017 BT_DBG("chan %p, control %p", chan, control);
6018
6019 if (control->reqseq == chan->next_tx_seq) {
6020 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 6021 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6022 return;
6023 }
6024
6025 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
6026
6027 if (chan->max_tx && skb &&
a4368ff3 6028 bt_cb(skb)->l2cap.retries >= chan->max_tx) {
fcd289df 6029 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 6030 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6031 return;
6032 }
6033
6034 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6035
6036 l2cap_pass_to_tx(chan, control);
6037
6038 if (control->final) {
6039 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6040 l2cap_retransmit_all(chan, control);
6041 } else {
6042 l2cap_retransmit_all(chan, control);
6043 l2cap_ertm_send(chan);
6044 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6045 set_bit(CONN_REJ_ACT, &chan->conn_state);
6046 }
d2a7ac5d
MM		 6047}
6048
4b51dae9
MM		 6049static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6050{
6051 BT_DBG("chan %p, txseq %d", chan, txseq);
6052
6053 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6054 chan->expected_tx_seq);
6055
6056 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6057 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 6058 chan->tx_win) {
4b51dae9
MM		 6059 /* See notes below regarding "double poll" and
6060 * invalid packets.
6061 */
6062 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6063 BT_DBG("Invalid/Ignore - after SREJ");
6064 return L2CAP_TXSEQ_INVALID_IGNORE;
6065 } else {
6066 BT_DBG("Invalid - in window after SREJ sent");
6067 return L2CAP_TXSEQ_INVALID;
6068 }
6069 }
6070
6071 if (chan->srej_list.head == txseq) {
6072 BT_DBG("Expected SREJ");
6073 return L2CAP_TXSEQ_EXPECTED_SREJ;
6074 }
6075
6076 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6077 BT_DBG("Duplicate SREJ - txseq already stored");
6078 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6079 }
6080
6081 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6082 BT_DBG("Unexpected SREJ - not requested");
6083 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6084 }
6085 }
6086
6087 if (chan->expected_tx_seq == txseq) {
6088 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6089 chan->tx_win) {
6090 BT_DBG("Invalid - txseq outside tx window");
6091 return L2CAP_TXSEQ_INVALID;
6092 } else {
6093 BT_DBG("Expected");
6094 return L2CAP_TXSEQ_EXPECTED;
6095 }
6096 }
6097
6098 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6099 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6100 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6101 return L2CAP_TXSEQ_DUPLICATE;
6102 }
6103
6104 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6105 /* A source of invalid packets is a "double poll" condition,
6106 * where delays cause us to send multiple poll packets. If
6107 * the remote stack receives and processes both polls,
6108 * sequence numbers can wrap around in such a way that a
6109 * resent frame has a sequence number that looks like new data
6110 * with a sequence gap. This would trigger an erroneous SREJ
6111 * request.
6112 *
6113 * Fortunately, this is impossible with a tx window that's
6114 * less than half of the maximum sequence number, which allows
6115 * invalid frames to be safely ignored.
6116 *
6117 * With tx window sizes greater than half of the tx window
6118 * maximum, the frame is invalid and cannot be ignored. This
6119 * causes a disconnect.
6120 */
6121
6122 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6123 BT_DBG("Invalid/Ignore - txseq outside tx window");
6124 return L2CAP_TXSEQ_INVALID_IGNORE;
6125 } else {
6126 BT_DBG("Invalid - txseq outside tx window");
6127 return L2CAP_TXSEQ_INVALID;
6128 }
6129 } else {
6130 BT_DBG("Unexpected - txseq indicates missing frames");
6131 return L2CAP_TXSEQ_UNEXPECTED;
6132 }
6133}
6134
d2a7ac5d
MM		 6135static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6136 struct l2cap_ctrl *control,
6137 struct sk_buff *skb, u8 event)
6138{
6139 int err = 0;
941247f9 6140 bool skb_in_use = false;
d2a7ac5d
MM		 6141
6142 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6143 event);
6144
6145 switch (event) {
6146 case L2CAP_EV_RECV_IFRAME:
6147 switch (l2cap_classify_txseq(chan, control->txseq)) {
6148 case L2CAP_TXSEQ_EXPECTED:
6149 l2cap_pass_to_tx(chan, control);
6150
6151 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6152 BT_DBG("Busy, discarding expected seq %d",
6153 control->txseq);
6154 break;
6155 }
6156
6157 chan->expected_tx_seq = __next_seq(chan,
6158 control->txseq);
6159
6160 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6161 skb_in_use = true;
d2a7ac5d
MM		 6162
6163 err = l2cap_reassemble_sdu(chan, skb, control);
6164 if (err)
6165 break;
6166
6167 if (control->final) {
6168 if (!test_and_clear_bit(CONN_REJ_ACT,
6169 &chan->conn_state)) {
6170 control->final = 0;
6171 l2cap_retransmit_all(chan, control);
6172 l2cap_ertm_send(chan);
6173 }
6174 }
6175
6176 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6177 l2cap_send_ack(chan);
6178 break;
6179 case L2CAP_TXSEQ_UNEXPECTED:
6180 l2cap_pass_to_tx(chan, control);
6181
6182 /* Can't issue SREJ frames in the local busy state.
6183 * Drop this frame, it will be seen as missing
6184 * when local busy is exited.
6185 */
6186 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6187 BT_DBG("Busy, discarding unexpected seq %d",
6188 control->txseq);
6189 break;
6190 }
6191
6192 /* There was a gap in the sequence, so an SREJ
6193 * must be sent for each missing frame. The
6194 * current frame is stored for later use.
6195 */
6196 skb_queue_tail(&chan->srej_q, skb);
941247f9 6197 skb_in_use = true;
d2a7ac5d
MM		 6198 BT_DBG("Queued %p (queue len %d)", skb,
6199 skb_queue_len(&chan->srej_q));
6200
6201 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6202 l2cap_seq_list_clear(&chan->srej_list);
6203 l2cap_send_srej(chan, control->txseq);
6204
6205 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6206 break;
6207 case L2CAP_TXSEQ_DUPLICATE:
6208 l2cap_pass_to_tx(chan, control);
6209 break;
6210 case L2CAP_TXSEQ_INVALID_IGNORE:
6211 break;
6212 case L2CAP_TXSEQ_INVALID:
6213 default:
5e4e3972 6214 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6215 break;
6216 }
6217 break;
6218 case L2CAP_EV_RECV_RR:
6219 l2cap_pass_to_tx(chan, control);
6220 if (control->final) {
6221 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6222
e6a3ee6e
MM		 6223 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6224 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6225 control->final = 0;
6226 l2cap_retransmit_all(chan, control);
6227 }
6228
6229 l2cap_ertm_send(chan);
6230 } else if (control->poll) {
6231 l2cap_send_i_or_rr_or_rnr(chan);
6232 } else {
6233 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6234 &chan->conn_state) &&
6235 chan->unacked_frames)
6236 __set_retrans_timer(chan);
6237
6238 l2cap_ertm_send(chan);
6239 }
6240 break;
6241 case L2CAP_EV_RECV_RNR:
6242 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6243 l2cap_pass_to_tx(chan, control);
6244 if (control && control->poll) {
6245 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6246 l2cap_send_rr_or_rnr(chan, 0);
6247 }
6248 __clear_retrans_timer(chan);
6249 l2cap_seq_list_clear(&chan->retrans_list);
6250 break;
6251 case L2CAP_EV_RECV_REJ:
6252 l2cap_handle_rej(chan, control);
6253 break;
6254 case L2CAP_EV_RECV_SREJ:
6255 l2cap_handle_srej(chan, control);
6256 break;
6257 default:
6258 break;
6259 }
6260
6261 if (skb && !skb_in_use) {
6262 BT_DBG("Freeing %p", skb);
6263 kfree_skb(skb);
6264 }
6265
6266 return err;
6267}
6268
6269static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6270 struct l2cap_ctrl *control,
6271 struct sk_buff *skb, u8 event)
6272{
6273 int err = 0;
6274 u16 txseq = control->txseq;
941247f9 6275 bool skb_in_use = false;
d2a7ac5d
MM		 6276
6277 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6278 event);
6279
6280 switch (event) {
6281 case L2CAP_EV_RECV_IFRAME:
6282 switch (l2cap_classify_txseq(chan, txseq)) {
6283 case L2CAP_TXSEQ_EXPECTED:
6284 /* Keep frame for reassembly later */
6285 l2cap_pass_to_tx(chan, control);
6286 skb_queue_tail(&chan->srej_q, skb);
941247f9 6287 skb_in_use = true;
d2a7ac5d
MM		 6288 BT_DBG("Queued %p (queue len %d)", skb,
6289 skb_queue_len(&chan->srej_q));
6290
6291 chan->expected_tx_seq = __next_seq(chan, txseq);
6292 break;
6293 case L2CAP_TXSEQ_EXPECTED_SREJ:
6294 l2cap_seq_list_pop(&chan->srej_list);
6295
6296 l2cap_pass_to_tx(chan, control);
6297 skb_queue_tail(&chan->srej_q, skb);
941247f9 6298 skb_in_use = true;
d2a7ac5d
MM		 6299 BT_DBG("Queued %p (queue len %d)", skb,
6300 skb_queue_len(&chan->srej_q));
6301
6302 err = l2cap_rx_queued_iframes(chan);
6303 if (err)
6304 break;
6305
6306 break;
6307 case L2CAP_TXSEQ_UNEXPECTED:
6308 /* Got a frame that can't be reassembled yet.
6309 * Save it for later, and send SREJs to cover
6310 * the missing frames.
6311 */
6312 skb_queue_tail(&chan->srej_q, skb);
941247f9 6313 skb_in_use = true;
d2a7ac5d
MM		 6314 BT_DBG("Queued %p (queue len %d)", skb,
6315 skb_queue_len(&chan->srej_q));
6316
6317 l2cap_pass_to_tx(chan, control);
6318 l2cap_send_srej(chan, control->txseq);
6319 break;
6320 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6321 /* This frame was requested with an SREJ, but
6322 * some expected retransmitted frames are
6323 * missing. Request retransmission of missing
6324 * SREJ'd frames.
6325 */
6326 skb_queue_tail(&chan->srej_q, skb);
941247f9 6327 skb_in_use = true;
d2a7ac5d
MM		 6328 BT_DBG("Queued %p (queue len %d)", skb,
6329 skb_queue_len(&chan->srej_q));
6330
6331 l2cap_pass_to_tx(chan, control);
6332 l2cap_send_srej_list(chan, control->txseq);
6333 break;
6334 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6335 /* We've already queued this frame. Drop this copy. */
6336 l2cap_pass_to_tx(chan, control);
6337 break;
6338 case L2CAP_TXSEQ_DUPLICATE:
6339 /* Expecting a later sequence number, so this frame
6340 * was already received. Ignore it completely.
6341 */
6342 break;
6343 case L2CAP_TXSEQ_INVALID_IGNORE:
6344 break;
6345 case L2CAP_TXSEQ_INVALID:
6346 default:
5e4e3972 6347 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6348 break;
6349 }
6350 break;
6351 case L2CAP_EV_RECV_RR:
6352 l2cap_pass_to_tx(chan, control);
6353 if (control->final) {
6354 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6355
6356 if (!test_and_clear_bit(CONN_REJ_ACT,
6357 &chan->conn_state)) {
6358 control->final = 0;
6359 l2cap_retransmit_all(chan, control);
6360 }
6361
6362 l2cap_ertm_send(chan);
6363 } else if (control->poll) {
6364 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6365 &chan->conn_state) &&
6366 chan->unacked_frames) {
6367 __set_retrans_timer(chan);
6368 }
6369
6370 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6371 l2cap_send_srej_tail(chan);
6372 } else {
6373 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6374 &chan->conn_state) &&
6375 chan->unacked_frames)
6376 __set_retrans_timer(chan);
6377
6378 l2cap_send_ack(chan);
6379 }
6380 break;
6381 case L2CAP_EV_RECV_RNR:
6382 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6383 l2cap_pass_to_tx(chan, control);
6384 if (control->poll) {
6385 l2cap_send_srej_tail(chan);
6386 } else {
6387 struct l2cap_ctrl rr_control;
6388 memset(&rr_control, 0, sizeof(rr_control));
6389 rr_control.sframe = 1;
6390 rr_control.super = L2CAP_SUPER_RR;
6391 rr_control.reqseq = chan->buffer_seq;
6392 l2cap_send_sframe(chan, &rr_control);
6393 }
6394
6395 break;
6396 case L2CAP_EV_RECV_REJ:
6397 l2cap_handle_rej(chan, control);
6398 break;
6399 case L2CAP_EV_RECV_SREJ:
6400 l2cap_handle_srej(chan, control);
6401 break;
6402 }
6403
6404 if (skb && !skb_in_use) {
6405 BT_DBG("Freeing %p", skb);
6406 kfree_skb(skb);
6407 }
6408
6409 return err;
6410}
6411
32b32735
MM		 6412static int l2cap_finish_move(struct l2cap_chan *chan)
6413{
6414 BT_DBG("chan %p", chan);
6415
6416 chan->rx_state = L2CAP_RX_STATE_RECV;
6417
6418 if (chan->hs_hcon)
6419 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6420 else
6421 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6422
6423 return l2cap_resegment(chan);
6424}
6425
6426static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6427 struct l2cap_ctrl *control,
6428 struct sk_buff *skb, u8 event)
6429{
6430 int err;
6431
6432 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6433 event);
6434
6435 if (!control->poll)
6436 return -EPROTO;
6437
6438 l2cap_process_reqseq(chan, control->reqseq);
6439
6440 if (!skb_queue_empty(&chan->tx_q))
6441 chan->tx_send_head = skb_peek(&chan->tx_q);
6442 else
6443 chan->tx_send_head = NULL;
6444
6445 /* Rewind next_tx_seq to the point expected
6446 * by the receiver.
6447 */
6448 chan->next_tx_seq = control->reqseq;
6449 chan->unacked_frames = 0;
6450
6451 err = l2cap_finish_move(chan);
6452 if (err)
6453 return err;
6454
6455 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6456 l2cap_send_i_or_rr_or_rnr(chan);
6457
6458 if (event == L2CAP_EV_RECV_IFRAME)
6459 return -EPROTO;
6460
6461 return l2cap_rx_state_recv(chan, control, NULL, event);
6462}
6463
6464static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6465 struct l2cap_ctrl *control,
6466 struct sk_buff *skb, u8 event)
6467{
6468 int err;
6469
6470 if (!control->final)
6471 return -EPROTO;
6472
6473 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6474
6475 chan->rx_state = L2CAP_RX_STATE_RECV;
6476 l2cap_process_reqseq(chan, control->reqseq);
6477
6478 if (!skb_queue_empty(&chan->tx_q))
6479 chan->tx_send_head = skb_peek(&chan->tx_q);
6480 else
6481 chan->tx_send_head = NULL;
6482
6483 /* Rewind next_tx_seq to the point expected
6484 * by the receiver.
6485 */
6486 chan->next_tx_seq = control->reqseq;
6487 chan->unacked_frames = 0;
6488
6489 if (chan->hs_hcon)
6490 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6491 else
6492 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6493
6494 err = l2cap_resegment(chan);
6495
6496 if (!err)
6497 err = l2cap_rx_state_recv(chan, control, skb, event);
6498
6499 return err;
6500}
6501
d2a7ac5d
MM		 6502static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6503{
6504 /* Make sure reqseq is for a packet that has been sent but not acked */
6505 u16 unacked;
6506
6507 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6508 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6509}
6510
cec8ab6e
MM		 6511static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6512 struct sk_buff *skb, u8 event)
218bb9df 6513{
d2a7ac5d
MM		 6514 int err = 0;
6515
6516 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6517 control, skb, event, chan->rx_state);
6518
6519 if (__valid_reqseq(chan, control->reqseq)) {
6520 switch (chan->rx_state) {
6521 case L2CAP_RX_STATE_RECV:
6522 err = l2cap_rx_state_recv(chan, control, skb, event);
6523 break;
6524 case L2CAP_RX_STATE_SREJ_SENT:
6525 err = l2cap_rx_state_srej_sent(chan, control, skb,
6526 event);
6527 break;
32b32735
MM		 6528 case L2CAP_RX_STATE_WAIT_P:
6529 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6530 break;
6531 case L2CAP_RX_STATE_WAIT_F:
6532 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6533 break;
d2a7ac5d
MM		 6534 default:
6535 /* shut it down */
6536 break;
6537 }
6538 } else {
6539 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6540 control->reqseq, chan->next_tx_seq,
6541 chan->expected_ack_seq);
5e4e3972 6542 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6543 }
6544
6545 return err;
cec8ab6e
MM		 6546}
6547
6548static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6549 struct sk_buff *skb)
6550{
4b51dae9
MM		 6551 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6552 chan->rx_state);
6553
6554 if (l2cap_classify_txseq(chan, control->txseq) ==
6555 L2CAP_TXSEQ_EXPECTED) {
6556 l2cap_pass_to_tx(chan, control);
6557
6558 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6559 __next_seq(chan, chan->buffer_seq));
6560
6561 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6562
6563 l2cap_reassemble_sdu(chan, skb, control);
6564 } else {
6565 if (chan->sdu) {
6566 kfree_skb(chan->sdu);
6567 chan->sdu = NULL;
6568 }
6569 chan->sdu_last_frag = NULL;
6570 chan->sdu_len = 0;
6571
6572 if (skb) {
6573 BT_DBG("Freeing %p", skb);
6574 kfree_skb(skb);
6575 }
6576 }
6577
6578 chan->last_acked_seq = control->txseq;
6579 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6580
9a544210 6581 return 0;
cec8ab6e
MM		 6582}
6583
6584static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6585{
a4368ff3 6586 struct l2cap_ctrl *control = &bt_cb(skb)->l2cap;
cec8ab6e
MM		 6587 u16 len;
6588 u8 event;
218bb9df 6589
b76bbd66
MM		 6590 __unpack_control(chan, skb);
6591
218bb9df
GP		 6592 len = skb->len;
6593
6594 /*
6595 * We can just drop the corrupted I-frame here.
6596 * Receiver will miss it and start proper recovery
cec8ab6e 6597 * procedures and ask for retransmission.
218bb9df 6598 */
47d1ec61 6599 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6600 goto drop;
6601
cec8ab6e 6602 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6603 len -= L2CAP_SDULEN_SIZE;
218bb9df 6604
47d1ec61 6605 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6606 len -= L2CAP_FCS_SIZE;
218bb9df 6607
47d1ec61 6608 if (len > chan->mps) {
5e4e3972 6609 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6610 goto drop;
6611 }
6612
cec8ab6e
MM		 6613 if (!control->sframe) {
6614 int err;
218bb9df 6615
cec8ab6e
MM		 6616 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6617 control->sar, control->reqseq, control->final,
6618 control->txseq);
218bb9df 6619
cec8ab6e
MM		 6620 /* Validate F-bit - F=0 always valid, F=1 only
6621 * valid in TX WAIT_F
6622 */
6623 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6624 goto drop;
cec8ab6e
MM		 6625
6626 if (chan->mode != L2CAP_MODE_STREAMING) {
6627 event = L2CAP_EV_RECV_IFRAME;
6628 err = l2cap_rx(chan, control, skb, event);
6629 } else {
6630 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6631 }
6632
cec8ab6e 6633 if (err)
5e4e3972 6634 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6635 } else {
cec8ab6e
MM		 6636 const u8 rx_func_to_event[4] = {
6637 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6638 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6639 };
6640
6641 /* Only I-frames are expected in streaming mode */
6642 if (chan->mode == L2CAP_MODE_STREAMING)
6643 goto drop;
6644
6645 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6646 control->reqseq, control->final, control->poll,
6647 control->super);
6648
218bb9df 6649 if (len != 0) {
1bb166e6 6650 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6651 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6652 goto drop;
6653 }
6654
cec8ab6e
MM		 6655 /* Validate F and P bits */
6656 if (control->final && (control->poll ||
6657 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6658 goto drop;
6659
6660 event = rx_func_to_event[control->super];
6661 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6662 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6663 }
6664
6665 return 0;
6666
6667drop:
6668 kfree_skb(skb);
6669 return 0;
6670}
6671
b1c325c2
JH		 6672static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6673{
6674 struct l2cap_conn *conn = chan->conn;
6675 struct l2cap_le_credits pkt;
6676 u16 return_credits;
6677
6678 /* We return more credits to the sender only after the amount of
6679 * credits falls below half of the initial amount.
6680 */
f15b8ecf 6681 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6682 return;
6683
f15b8ecf 6684 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6685
6686 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6687
6688 chan->rx_credits += return_credits;
6689
6690 pkt.cid = cpu_to_le16(chan->scid);
6691 pkt.credits = cpu_to_le16(return_credits);
6692
6693 chan->ident = l2cap_get_ident(conn);
6694
6695 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6696}
6697
fad5fc89
JH		 6698static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6699{
aac23bf6
JH		 6700 int err;
6701
6702 if (!chan->rx_credits) {
6703 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6704 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6705 return -ENOBUFS;
aac23bf6 6706 }
fad5fc89 6707
aac23bf6
JH		 6708 if (chan->imtu < skb->len) {
6709 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6710 return -ENOBUFS;
aac23bf6 6711 }
fad5fc89
JH		 6712
6713 chan->rx_credits--;
6714 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6715
6716 l2cap_chan_le_send_credits(chan);
6717
aac23bf6
JH		 6718 err = 0;
6719
6720 if (!chan->sdu) {
6721 u16 sdu_len;
6722
6723 sdu_len = get_unaligned_le16(skb->data);
6724 skb_pull(skb, L2CAP_SDULEN_SIZE);
6725
6726 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6727 sdu_len, skb->len, chan->imtu);
6728
6729 if (sdu_len > chan->imtu) {
6730 BT_ERR("Too big LE L2CAP SDU length received");
6731 err = -EMSGSIZE;
6732 goto failed;
6733 }
6734
6735 if (skb->len > sdu_len) {
6736 BT_ERR("Too much LE L2CAP data received");
6737 err = -EINVAL;
6738 goto failed;
6739 }
6740
6741 if (skb->len == sdu_len)
6742 return chan->ops->recv(chan, skb);
6743
6744 chan->sdu = skb;
6745 chan->sdu_len = sdu_len;
6746 chan->sdu_last_frag = skb;
6747
6748 return 0;
6749 }
6750
6751 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6752 chan->sdu->len, skb->len, chan->sdu_len);
6753
6754 if (chan->sdu->len + skb->len > chan->sdu_len) {
6755 BT_ERR("Too much LE L2CAP data received");
6756 err = -EINVAL;
6757 goto failed;
6758 }
6759
6760 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6761 skb = NULL;
6762
6763 if (chan->sdu->len == chan->sdu_len) {
6764 err = chan->ops->recv(chan, chan->sdu);
6765 if (!err) {
6766 chan->sdu = NULL;
6767 chan->sdu_last_frag = NULL;
6768 chan->sdu_len = 0;
6769 }
6770 }
6771
6772failed:
6773 if (err) {
6774 kfree_skb(skb);
6775 kfree_skb(chan->sdu);
6776 chan->sdu = NULL;
6777 chan->sdu_last_frag = NULL;
6778 chan->sdu_len = 0;
6779 }
6780
6781 /* We can't return an error here since we took care of the skb
6782 * freeing internally. An error return would cause the caller to
6783 * do a double-free of the skb.
6784 */
6785 return 0;
fad5fc89
JH		 6786}
6787
13ca56e0
AE		 6788static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6789 struct sk_buff *skb)
1da177e4 6790{
48454079 6791 struct l2cap_chan *chan;
1da177e4 6792
baa7e1fa 6793 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6794 if (!chan) {
97e8e89d
AE		 6795 if (cid == L2CAP_CID_A2MP) {
6796 chan = a2mp_channel_create(conn, skb);
6797 if (!chan) {
6798 kfree_skb(skb);
13ca56e0 6799 return;
97e8e89d
AE		 6800 }
6801
6802 l2cap_chan_lock(chan);
6803 } else {
6804 BT_DBG("unknown cid 0x%4.4x", cid);
6805 /* Drop packet and return */
6806 kfree_skb(skb);
13ca56e0 6807 return;
97e8e89d 6808 }
1da177e4
LT		 6809 }
6810
49208c9c 6811 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6812
315917e0
JH		 6813 /* If we receive data on a fixed channel before the info req/rsp
6814 * procdure is done simply assume that the channel is supported
6815 * and mark it as ready.
6816 */
6817 if (chan->chan_type == L2CAP_CHAN_FIXED)
6818 l2cap_chan_ready(chan);
6819
89bc500e 6820 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6821 goto drop;
6822
0c1bc5c6 6823 switch (chan->mode) {
38319713 6824 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6825 if (l2cap_le_data_rcv(chan, skb) < 0)
6826 goto drop;
6827
6828 goto done;
6829
1c2acffb
GP		 6830 case L2CAP_MODE_BASIC:
6831 /* If socket recv buffers overflows we drop data here
6832 * which is *bad* because L2CAP has to be reliable.
6833 * But we don't have any other choice. L2CAP doesn't
6834 * provide flow control mechanism. */
1da177e4 6835
2c96e03d
SJ		 6836 if (chan->imtu < skb->len) {
6837 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6838 goto drop;
2c96e03d 6839 }
1da177e4 6840
80b98027 6841 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6842 goto done;
6843 break;
6844
6845 case L2CAP_MODE_ERTM:
6840ed07 6846 case L2CAP_MODE_STREAMING:
cec8ab6e 6847 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6848 goto done;
6849
1c2acffb 6850 default:
0c1bc5c6 6851 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6852 break;
6853 }
1da177e4
LT		 6854
6855drop:
6856 kfree_skb(skb);
6857
6858done:
6be36555 6859 l2cap_chan_unlock(chan);
1da177e4
LT		 6860}
6861
84104b24
AE		 6862static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6863 struct sk_buff *skb)
1da177e4 6864{
ae4fd2d3 6865 struct hci_conn *hcon = conn->hcon;
23691d75 6866 struct l2cap_chan *chan;
1da177e4 6867
ae4fd2d3 6868 if (hcon->type != ACL_LINK)
a24cce14 6869 goto free_skb;
ae4fd2d3 6870
bf20fd4e
JH		 6871 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6872 ACL_LINK);
23691d75 6873 if (!chan)
a24cce14 6874 goto free_skb;
1da177e4 6875
5b4cedaa 6876 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6877
89bc500e 6878 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6879 goto drop;
6880
e13e21dc 6881 if (chan->imtu < skb->len)
1da177e4
LT		 6882 goto drop;
6883
2edf870d 6884 /* Store remote BD_ADDR and PSM for msg_name */
a4368ff3
JH		 6885 bacpy(&bt_cb(skb)->l2cap.bdaddr, &hcon->dst);
6886 bt_cb(skb)->l2cap.psm = psm;
2edf870d 6887
a24cce14
JH		 6888 if (!chan->ops->recv(chan, skb)) {
6889 l2cap_chan_put(chan);
84104b24 6890 return;
a24cce14 6891 }
1da177e4
LT		 6892
6893drop:
a24cce14
JH		 6894 l2cap_chan_put(chan);
6895free_skb:
1da177e4 6896 kfree_skb(skb);
1da177e4
LT		 6897}
6898
6899static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6900{
6901 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6902 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6903 u16 cid, len;
6904 __le16 psm;
1da177e4 6905
61a939c6
JH		 6906 if (hcon->state != BT_CONNECTED) {
6907 BT_DBG("queueing pending rx skb");
6908 skb_queue_tail(&conn->pending_rx, skb);
6909 return;
6910 }
6911
1da177e4
LT		 6912 skb_pull(skb, L2CAP_HDR_SIZE);
6913 cid = __le16_to_cpu(lh->cid);
6914 len = __le16_to_cpu(lh->len);
6915
1c2acffb
GP		 6916 if (len != skb->len) {
6917 kfree_skb(skb);
6918 return;
6919 }
6920
9e1d7e15
JH		 6921 /* Since we can't actively block incoming LE connections we must
6922 * at least ensure that we ignore incoming data from them.
6923 */
6924 if (hcon->type == LE_LINK &&
dcc36c16 6925 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
a250e048 6926 bdaddr_dst_type(hcon))) {
e493150e
JH		 6927 kfree_skb(skb);
6928 return;
6929 }
6930
1da177e4
LT		 6931 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6932
6933 switch (cid) {
8db4dc46 6934 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6935 l2cap_sig_channel(conn, skb);
6936 break;
6937
8db4dc46 6938 case L2CAP_CID_CONN_LESS:
097db76c 6939 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6940 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6941 l2cap_conless_channel(conn, psm, skb);
6942 break;
6943
a2877629
MH		 6944 case L2CAP_CID_LE_SIGNALING:
6945 l2cap_le_sig_channel(conn, skb);
6946 break;
6947
1da177e4
LT		 6948 default:
6949 l2cap_data_channel(conn, cid, skb);
6950 break;
6951 }
6952}
6953
61a939c6
JH		 6954static void process_pending_rx(struct work_struct *work)
6955{
6956 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6957 pending_rx_work);
6958 struct sk_buff *skb;
6959
6960 BT_DBG("");
6961
6962 while ((skb = skb_dequeue(&conn->pending_rx)))
6963 l2cap_recv_frame(conn, skb);
6964}
6965
162b49e7
JH		 6966static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6967{
6968 struct l2cap_conn *conn = hcon->l2cap_data;
6969 struct hci_chan *hchan;
6970
6971 if (conn)
6972 return conn;
6973
6974 hchan = hci_chan_create(hcon);
6975 if (!hchan)
6976 return NULL;
6977
27f70f3e 6978 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
162b49e7
JH		 6979 if (!conn) {
6980 hci_chan_del(hchan);
6981 return NULL;
6982 }
6983
6984 kref_init(&conn->ref);
6985 hcon->l2cap_data = conn;
51bb8457 6986 conn->hcon = hci_conn_get(hcon);
162b49e7
JH		 6987 conn->hchan = hchan;
6988
6989 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6990
6991 switch (hcon->type) {
6992 case LE_LINK:
6993 if (hcon->hdev->le_mtu) {
6994 conn->mtu = hcon->hdev->le_mtu;
6995 break;
6996 }
6997 /* fall through */
6998 default:
6999 conn->mtu = hcon->hdev->acl_mtu;
7000 break;
7001 }
7002
7003 conn->feat_mask = 0;
7004
0bd49fc7
JH		 7005 conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS;
7006
7007 if (hcon->type == ACL_LINK &&
d7a5a11d 7008 hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED))
0bd49fc7 7009 conn->local_fixed_chan |= L2CAP_FC_A2MP;
162b49e7 7010
d7a5a11d 7011 if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) &&
f9be9e86 7012 (bredr_sc_enabled(hcon->hdev) ||
b7cb93e5 7013 hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP)))
b5ae344d
JH		 7014 conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR;
7015
5a54e7c8 7016 mutex_init(&conn->ident_lock);
162b49e7
JH		 7017 mutex_init(&conn->chan_lock);
7018
7019 INIT_LIST_HEAD(&conn->chan_l);
7020 INIT_LIST_HEAD(&conn->users);
7021
276d8073 7022 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
162b49e7 7023
61a939c6
JH		 7024 skb_queue_head_init(&conn->pending_rx);
7025 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
f3d82d0c 7026 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
61a939c6 7027
162b49e7
JH		 7028 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
7029
7030 return conn;
7031}
7032
7033static bool is_valid_psm(u16 psm, u8 dst_type) {
7034 if (!psm)
7035 return false;
7036
7037 if (bdaddr_type_is_le(dst_type))
7038 return (psm <= 0x00ff);
7039
7040 /* PSM must be odd and lsb of upper byte must be 0 */
7041 return ((psm & 0x0101) == 0x0001);
7042}
7043
7044int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
7045 bdaddr_t *dst, u8 dst_type)
7046{
7047 struct l2cap_conn *conn;
7048 struct hci_conn *hcon;
7049 struct hci_dev *hdev;
162b49e7
JH		 7050 int err;
7051
7052 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7053 dst_type, __le16_to_cpu(psm));
7054
7055 hdev = hci_get_route(dst, &chan->src);
7056 if (!hdev)
7057 return -EHOSTUNREACH;
7058
7059 hci_dev_lock(hdev);
7060
162b49e7
JH		 7061 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7062 chan->chan_type != L2CAP_CHAN_RAW) {
7063 err = -EINVAL;
7064 goto done;
7065 }
7066
21626e62
JH		 7067 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7068 err = -EINVAL;
7069 goto done;
7070 }
7071
7072 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 7073 err = -EINVAL;
7074 goto done;
7075 }
7076
7077 switch (chan->mode) {
7078 case L2CAP_MODE_BASIC:
7079 break;
7080 case L2CAP_MODE_LE_FLOWCTL:
7081 l2cap_le_flowctl_init(chan);
7082 break;
7083 case L2CAP_MODE_ERTM:
7084 case L2CAP_MODE_STREAMING:
7085 if (!disable_ertm)
7086 break;
7087 /* fall through */
7088 default:
beb19e4c 7089 err = -EOPNOTSUPP;
162b49e7
JH		 7090 goto done;
7091 }
7092
7093 switch (chan->state) {
7094 case BT_CONNECT:
7095 case BT_CONNECT2:
7096 case BT_CONFIG:
7097 /* Already connecting */
7098 err = 0;
7099 goto done;
7100
7101 case BT_CONNECTED:
7102 /* Already connected */
7103 err = -EISCONN;
7104 goto done;
7105
7106 case BT_OPEN:
7107 case BT_BOUND:
7108 /* Can connect */
7109 break;
7110
7111 default:
7112 err = -EBADFD;
7113 goto done;
7114 }
7115
7116 /* Set destination address and psm */
7117 bacpy(&chan->dst, dst);
7118 chan->dst_type = dst_type;
7119
7120 chan->psm = psm;
7121 chan->dcid = cid;
7122
6f77d8c7
AG		 7123 if (bdaddr_type_is_le(dst_type)) {
7124 /* Convert from L2CAP channel address type to HCI address type
7125 */
7126 if (dst_type == BDADDR_LE_PUBLIC)
7127 dst_type = ADDR_LE_DEV_PUBLIC;
7128 else
7129 dst_type = ADDR_LE_DEV_RANDOM;
7130
d7a5a11d 7131 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
0ad06aa6
JH		 7132 hcon = hci_connect_le(hdev, dst, dst_type,
7133 chan->sec_level,
7134 HCI_LE_CONN_TIMEOUT,
7135 HCI_ROLE_SLAVE);
e804d25d 7136 else
0ad06aa6
JH		 7137 hcon = hci_connect_le_scan(hdev, dst, dst_type,
7138 chan->sec_level,
7139 HCI_LE_CONN_TIMEOUT);
cdd6275e 7140
6f77d8c7 7141 } else {
d93375a8 7142 u8 auth_type = l2cap_get_auth_type(chan);
04a6c589 7143 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7144 }
162b49e7
JH		 7145
7146 if (IS_ERR(hcon)) {
7147 err = PTR_ERR(hcon);
7148 goto done;
7149 }
7150
7151 conn = l2cap_conn_add(hcon);
7152 if (!conn) {
7153 hci_conn_drop(hcon);
7154 err = -ENOMEM;
7155 goto done;
7156 }
7157
02e246ae
JH		 7158 mutex_lock(&conn->chan_lock);
7159 l2cap_chan_lock(chan);
7160
162b49e7
JH		 7161 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7162 hci_conn_drop(hcon);
7163 err = -EBUSY;
02e246ae 7164 goto chan_unlock;
162b49e7
JH		 7165 }
7166
7167 /* Update source addr of the socket */
7168 bacpy(&chan->src, &hcon->src);
a250e048 7169 chan->src_type = bdaddr_src_type(hcon);
162b49e7 7170
02e246ae 7171 __l2cap_chan_add(conn, chan);
162b49e7
JH		 7172
7173 /* l2cap_chan_add takes its own ref so we can drop this one */
7174 hci_conn_drop(hcon);
7175
7176 l2cap_state_change(chan, BT_CONNECT);
7177 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7178
61202e4d
JH		 7179 /* Release chan->sport so that it can be reused by other
7180 * sockets (as it's only used for listening sockets).
7181 */
7182 write_lock(&chan_list_lock);
7183 chan->sport = 0;
7184 write_unlock(&chan_list_lock);
7185
162b49e7
JH		 7186 if (hcon->state == BT_CONNECTED) {
7187 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7188 __clear_chan_timer(chan);
e7cafc45 7189 if (l2cap_chan_check_security(chan, true))
162b49e7
JH		 7190 l2cap_state_change(chan, BT_CONNECTED);
7191 } else
7192 l2cap_do_start(chan);
7193 }
7194
7195 err = 0;
7196
02e246ae 7197chan_unlock:
162b49e7 7198 l2cap_chan_unlock(chan);
02e246ae
JH		 7199 mutex_unlock(&conn->chan_lock);
7200done:
162b49e7
JH		 7201 hci_dev_unlock(hdev);
7202 hci_dev_put(hdev);
7203 return err;
7204}
6b8d4a6a 7205EXPORT_SYMBOL_GPL(l2cap_chan_connect);
162b49e7 7206
1da177e4
LT		 7207/* ---- L2CAP interface with lower layer (HCI) ---- */
7208
686ebf28 7209int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7210{
7211 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7212 struct l2cap_chan *c;
1da177e4 7213
6ed93dc6 7214 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7215
7216 /* Find listening sockets and check their link_mode */
23691d75
GP		 7217 read_lock(&chan_list_lock);
7218 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7219 if (c->state != BT_LISTEN)
1da177e4
LT		 7220 continue;
7221
7eafc59e 7222 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7223 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7224 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7225 lm1 |= HCI_LM_MASTER;
1da177e4 7226 exact++;
7eafc59e 7227 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7228 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7229 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7230 lm2 |= HCI_LM_MASTER;
7231 }
1da177e4 7232 }
23691d75 7233 read_unlock(&chan_list_lock);
1da177e4
LT		 7234
7235 return exact ? lm1 : lm2;
7236}
7237
e760ec12
JH		 7238/* Find the next fixed channel in BT_LISTEN state, continue iteration
7239 * from an existing channel in the list or from the beginning of the
7240 * global list (by passing NULL as first parameter).
7241 */
7242static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
327a7191 7243 struct hci_conn *hcon)
e760ec12 7244{
327a7191
JH		 7245 u8 src_type = bdaddr_src_type(hcon);
7246
e760ec12
JH		 7247 read_lock(&chan_list_lock);
7248
7249 if (c)
7250 c = list_next_entry(c, global_l);
7251 else
7252 c = list_entry(chan_list.next, typeof(*c), global_l);
7253
7254 list_for_each_entry_from(c, &chan_list, global_l) {
7255 if (c->chan_type != L2CAP_CHAN_FIXED)
7256 continue;
7257 if (c->state != BT_LISTEN)
7258 continue;
327a7191 7259 if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY))
54a1b626 7260 continue;
327a7191 7261 if (src_type != c->src_type)
54a1b626 7262 continue;
e760ec12
JH		 7263
7264 l2cap_chan_hold(c);
7265 read_unlock(&chan_list_lock);
7266 return c;
7267 }
7268
7269 read_unlock(&chan_list_lock);
7270
7271 return NULL;
7272}
7273
539c496d 7274static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7275{
e760ec12 7276 struct hci_dev *hdev = hcon->hdev;
0139418c 7277 struct l2cap_conn *conn;
e760ec12
JH		 7278 struct l2cap_chan *pchan;
7279 u8 dst_type;
0139418c 7280
539c496d
JH		 7281 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7282 return;
7283
6ed93dc6 7284 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7285
dc0f5088 7286 if (status) {
e175072f 7287 l2cap_conn_del(hcon, bt_to_errno(status));
dc0f5088 7288 return;
ba6fc317 7289 }
dc0f5088
JH		 7290
7291 conn = l2cap_conn_add(hcon);
7292 if (!conn)
7293 return;
7294
a250e048 7295 dst_type = bdaddr_dst_type(hcon);
e760ec12
JH		 7296
7297 /* If device is blocked, do not create channels for it */
7298 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7299 return;
7300
7301 /* Find fixed channels and notify them of the new connection. We
7302 * use multiple individual lookups, continuing each time where
7303 * we left off, because the list lock would prevent calling the
7304 * potentially sleeping l2cap_chan_lock() function.
7305 */
327a7191 7306 pchan = l2cap_global_fixed_chan(NULL, hcon);
e760ec12
JH		 7307 while (pchan) {
7308 struct l2cap_chan *chan, *next;
7309
7310 /* Client fixed channels should override server ones */
7311 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7312 goto next;
7313
7314 l2cap_chan_lock(pchan);
7315 chan = pchan->ops->new_connection(pchan);
7316 if (chan) {
7317 bacpy(&chan->src, &hcon->src);
7318 bacpy(&chan->dst, &hcon->dst);
a250e048 7319 chan->src_type = bdaddr_src_type(hcon);
e760ec12
JH		 7320 chan->dst_type = dst_type;
7321
7322 __l2cap_chan_add(conn, chan);
7323 }
7324
7325 l2cap_chan_unlock(pchan);
7326next:
327a7191 7327 next = l2cap_global_fixed_chan(pchan, hcon);
e760ec12
JH		 7328 l2cap_chan_put(pchan);
7329 pchan = next;
7330 }
7331
dc0f5088 7332 l2cap_conn_ready(conn);
1da177e4
LT		 7333}
7334
686ebf28 7335int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7336{
7337 struct l2cap_conn *conn = hcon->l2cap_data;
7338
7339 BT_DBG("hcon %p", hcon);
7340
686ebf28 7341 if (!conn)
9f5a0d7b 7342 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7343 return conn->disc_reason;
7344}
7345
3a6d576b 7346static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4 7347{
3a6d576b
JH		 7348 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7349 return;
7350
1da177e4
LT		 7351 BT_DBG("hcon %p reason %d", hcon, reason);
7352
e175072f 7353 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7354}
7355
4343478f 7356static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7357{
715ec005 7358 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7359 return;
7360
f62e4323 7361 if (encrypt == 0x00) {
4343478f 7362 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7363 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7364 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7365 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7366 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7367 } else {
4343478f 7368 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7369 __clear_chan_timer(chan);
f62e4323
MH		 7370 }
7371}
7372
354fe804 7373static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7374{
0139418c 7375 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7376 struct l2cap_chan *chan;
1da177e4 7377
0139418c 7378 if (!conn)
354fe804 7379 return;
0139418c 7380
89d8b407 7381 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7382
3df91ea2 7383 mutex_lock(&conn->chan_lock);
1da177e4 7384
3df91ea2 7385 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7386 l2cap_chan_lock(chan);
1da177e4 7387
89d8b407
AE		 7388 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7389 state_to_string(chan->state));
f1cb9af5 7390
2338a7e0 7391 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7392 l2cap_chan_unlock(chan);
7393 continue;
7394 }
7395
191eb398
JH		 7396 if (!status && encrypt)
7397 chan->sec_level = hcon->sec_level;
f1cb9af5 7398
96eff46e 7399 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7400 l2cap_chan_unlock(chan);
6a8d3010
MH		 7401 continue;
7402 }
7403
89bc500e 7404 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7405 chan->state == BT_CONFIG)) {
d97c899b 7406 chan->ops->resume(chan);
4343478f 7407 l2cap_check_encryption(chan, encrypt);
6be36555 7408 l2cap_chan_unlock(chan);
9719f8af
MH		 7409 continue;
7410 }
7411
89bc500e 7412 if (chan->state == BT_CONNECT) {
6d3c15da 7413 if (!status)
93c3e8f5 7414 l2cap_start_connection(chan);
6d3c15da 7415 else
ba13ccd9 7416 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
fa37c1aa
JH		 7417 } else if (chan->state == BT_CONNECT2 &&
7418 chan->mode != L2CAP_MODE_LE_FLOWCTL) {
b1235d79 7419 struct l2cap_conn_rsp rsp;
df3c3931 7420 __u16 res, stat;
1da177e4 7421
b1235d79 7422 if (!status) {
bdc25783 7423 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7424 res = L2CAP_CR_PEND;
7425 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7426 chan->ops->defer(chan);
df3c3931 7427 } else {
acdcabf5 7428 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7429 res = L2CAP_CR_SUCCESS;
7430 stat = L2CAP_CS_NO_INFO;
7431 }
b1235d79 7432 } else {
acdcabf5 7433 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7434 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7435 res = L2CAP_CR_SEC_BLOCK;
7436 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7437 }
7438
fe4128e0
GP		 7439 rsp.scid = cpu_to_le16(chan->dcid);
7440 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7441 rsp.result = cpu_to_le16(res);
7442 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7443 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7444 sizeof(rsp), &rsp);
2d369359
MM		 7445
7446 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7447 res == L2CAP_CR_SUCCESS) {
7448 char buf[128];
7449 set_bit(CONF_REQ_SENT, &chan->conf_state);
7450 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7451 L2CAP_CONF_REQ,
7452 l2cap_build_conf_req(chan, buf),
7453 buf);
7454 chan->num_conf_req++;
7455 }
b1235d79 7456 }
1da177e4 7457
6be36555 7458 l2cap_chan_unlock(chan);
1da177e4
LT		 7459 }
7460
3df91ea2 7461 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 7462}
7463
9b4c3336 7464void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7465{
7466 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7467 struct l2cap_hdr *hdr;
7468 int len;
1da177e4 7469
1d13a254
AE		 7470 /* For AMP controller do not create l2cap conn */
7471 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7472 goto drop;
1da177e4 7473
5a08ecce 7474 if (!conn)
baf43251 7475 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7476
7477 if (!conn)
1da177e4
LT		 7478 goto drop;
7479
7480 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7481
d73a0988
AE		 7482 switch (flags) {
7483 case ACL_START:
7484 case ACL_START_NO_FLUSH:
7485 case ACL_COMPLETE:
1da177e4
LT		 7486 if (conn->rx_len) {
7487 BT_ERR("Unexpected start frame (len %d)", skb->len);
7488 kfree_skb(conn->rx_skb);
7489 conn->rx_skb = NULL;
7490 conn->rx_len = 0;
7491 l2cap_conn_unreliable(conn, ECOMM);
7492 }
7493
aae7fe22
AE		 7494 /* Start fragment always begin with Basic L2CAP header */
7495 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7496 BT_ERR("Frame is too short (len %d)", skb->len);
7497 l2cap_conn_unreliable(conn, ECOMM);
7498 goto drop;
7499 }
7500
7501 hdr = (struct l2cap_hdr *) skb->data;
7502 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7503
7504 if (len == skb->len) {
7505 /* Complete frame received */
7506 l2cap_recv_frame(conn, skb);
9b4c3336 7507 return;
1da177e4
LT		 7508 }
7509
7510 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7511
7512 if (skb->len > len) {
7513 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7514 skb->len, len);
1da177e4
LT		 7515 l2cap_conn_unreliable(conn, ECOMM);
7516 goto drop;
7517 }
7518
7519 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7520 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7521 if (!conn->rx_skb)
1da177e4
LT		 7522 goto drop;
7523
d626f62b 7524 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7525 skb->len);
1da177e4 7526 conn->rx_len = len - skb->len;
d73a0988
AE		 7527 break;
7528
7529 case ACL_CONT:
1da177e4
LT		 7530 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7531
7532 if (!conn->rx_len) {
7533 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7534 l2cap_conn_unreliable(conn, ECOMM);
7535 goto drop;
7536 }
7537
7538 if (skb->len > conn->rx_len) {
7539 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7540 skb->len, conn->rx_len);
1da177e4
LT		 7541 kfree_skb(conn->rx_skb);
7542 conn->rx_skb = NULL;
7543 conn->rx_len = 0;
7544 l2cap_conn_unreliable(conn, ECOMM);
7545 goto drop;
7546 }
7547
d626f62b 7548 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7549 skb->len);
1da177e4
LT		 7550 conn->rx_len -= skb->len;
7551
7552 if (!conn->rx_len) {
c4e5bafa
JH		 7553 /* Complete frame received. l2cap_recv_frame
7554 * takes ownership of the skb so set the global
7555 * rx_skb pointer to NULL first.
7556 */
7557 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7558 conn->rx_skb = NULL;
c4e5bafa 7559 l2cap_recv_frame(conn, rx_skb);
1da177e4 7560 }
d73a0988 7561 break;
1da177e4
LT		 7562 }
7563
7564drop:
7565 kfree_skb(skb);
1da177e4
LT		 7566}
7567
354fe804
JH		 7568static struct hci_cb l2cap_cb = {
7569 .name = "L2CAP",
539c496d 7570 .connect_cfm = l2cap_connect_cfm,
3a6d576b 7571 .disconn_cfm = l2cap_disconn_cfm,
354fe804
JH		 7572 .security_cfm = l2cap_security_cfm,
7573};
7574
aef7d97c 7575static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7576{
23691d75 7577 struct l2cap_chan *c;
1da177e4 7578
333055f2 7579 read_lock(&chan_list_lock);
1da177e4 7580
23691d75 7581 list_for_each_entry(c, &chan_list, global_l) {
eeb5a067
MH		 7582 seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7583 &c->src, c->src_type, &c->dst, c->dst_type,
fcb73338
AE		 7584 c->state, __le16_to_cpu(c->psm),
7585 c->scid, c->dcid, c->imtu, c->omtu,
7586 c->sec_level, c->mode);
61e1b4b7 7587 }
1da177e4 7588
333055f2 7589 read_unlock(&chan_list_lock);
1da177e4 7590
aef7d97c 7591 return 0;
1da177e4
LT		 7592}
7593
aef7d97c
MH		 7594static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7595{
7596 return single_open(file, l2cap_debugfs_show, inode->i_private);
7597}
7598
7599static const struct file_operations l2cap_debugfs_fops = {
7600 .open = l2cap_debugfs_open,
7601 .read = seq_read,
7602 .llseek = seq_lseek,
7603 .release = single_release,
7604};
7605
7606static struct dentry *l2cap_debugfs;
1da177e4 7607
64274518 7608int __init l2cap_init(void)
1da177e4
LT		 7609{
7610 int err;
be9d1227 7611
bb58f747 7612 err = l2cap_init_sockets();
1da177e4
LT		 7613 if (err < 0)
7614 return err;
7615
354fe804
JH		 7616 hci_register_cb(&l2cap_cb);
7617
1120e4bf
MH		 7618 if (IS_ERR_OR_NULL(bt_debugfs))
7619 return 0;
7620
7621 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7622 NULL, &l2cap_debugfs_fops);
1da177e4 7623
40b9397a 7624 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
f15b8ecf 7625 &le_max_credits);
40b9397a 7626 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
f15b8ecf
JH		 7627 &le_default_mps);
7628
1da177e4 7629 return 0;
1da177e4
LT		 7630}
7631
64274518 7632void l2cap_exit(void)
1da177e4 7633{
aef7d97c 7634 debugfs_remove(l2cap_debugfs);
354fe804 7635 hci_unregister_cb(&l2cap_cb);
bb58f747 7636 l2cap_cleanup_sockets();
1da177e4
LT		 7637}
7638
d1c4a17d
GP		 7639module_param(disable_ertm, bool, 0644);
7640MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
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