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Bluetooth: Provide option to enable/disable debugfs information
[linux-2.6-block.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
422e925b 7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
1da177e4
LT		 8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
8e87d142
YH		 24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 26 SOFTWARE IS DISCLAIMED.
27*/
28
bb58f747 29/* Bluetooth L2CAP core. */
1da177e4 30
1da177e4
LT		 31#include <linux/module.h>
32
aef7d97c 33#include <linux/debugfs.h>
fcc203c3 34#include <linux/crc16.h>
1da177e4
LT		 35
36#include <net/bluetooth/bluetooth.h>
37#include <net/bluetooth/hci_core.h>
38#include <net/bluetooth/l2cap.h>
7ef9fbf0 39
ac4b7236 40#include "smp.h"
7024728e 41#include "a2mp.h"
7ef9fbf0 42#include "amp.h"
1da177e4 43
0f1bfe4e
JH		 44#define LE_FLOWCTL_MAX_CREDITS 65535
45
d1de6d46 46bool disable_ertm;
f0709e03 47
547d1032 48static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
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 {
200 u16 p;
201
202 err = -EINVAL;
203 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 204 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 205 chan->psm = cpu_to_le16(p);
206 chan->sport = cpu_to_le16(p);
207 err = 0;
208 break;
209 }
210 }
9e4425ff 211
73b2ec18 212done:
333055f2 213 write_unlock(&chan_list_lock);
73b2ec18 214 return err;
9e4425ff 215}
6b8d4a6a 216EXPORT_SYMBOL_GPL(l2cap_add_psm);
9e4425ff
GP		 217
218int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
219{
333055f2 220 write_lock(&chan_list_lock);
9e4425ff 221
14824308
JH		 222 /* Override the defaults (which are for conn-oriented) */
223 chan->omtu = L2CAP_DEFAULT_MTU;
224 chan->chan_type = L2CAP_CHAN_FIXED;
225
9e4425ff
GP		 226 chan->scid = scid;
227
333055f2 228 write_unlock(&chan_list_lock);
9e4425ff
GP		 229
230 return 0;
231}
232
baa7e1fa 233static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 234{
e77af755 235 u16 cid, dyn_end;
0139418c 236
e77af755
JH		 237 if (conn->hcon->type == LE_LINK)
238 dyn_end = L2CAP_CID_LE_DYN_END;
239 else
240 dyn_end = L2CAP_CID_DYN_END;
241
242 for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) {
baa7e1fa 243 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 244 return cid;
245 }
246
247 return 0;
248}
249
f93fa273 250static void l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 251{
42d2d87c 252 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 253 state_to_string(state));
badaaa00 254
89bc500e 255 chan->state = state;
53f52121 256 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 257}
258
f8e73017
GP		 259static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
260 int state, int err)
2e0052e4 261{
f8e73017 262 chan->state = state;
53f52121 263 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 264}
265
266static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
267{
f8e73017 268 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 269}
270
4239d16f
MM		 271static void __set_retrans_timer(struct l2cap_chan *chan)
272{
273 if (!delayed_work_pending(&chan->monitor_timer) &&
274 chan->retrans_timeout) {
275 l2cap_set_timer(chan, &chan->retrans_timer,
276 msecs_to_jiffies(chan->retrans_timeout));
277 }
278}
279
280static void __set_monitor_timer(struct l2cap_chan *chan)
281{
282 __clear_retrans_timer(chan);
283 if (chan->monitor_timeout) {
284 l2cap_set_timer(chan, &chan->monitor_timer,
285 msecs_to_jiffies(chan->monitor_timeout));
286 }
287}
288
608bcc6d
MM		 289static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
290 u16 seq)
291{
292 struct sk_buff *skb;
293
294 skb_queue_walk(head, skb) {
295 if (bt_cb(skb)->control.txseq == seq)
296 return skb;
297 }
298
299 return NULL;
300}
301
3c588192
MM		 302/* ---- L2CAP sequence number lists ---- */
303
304/* For ERTM, ordered lists of sequence numbers must be tracked for
305 * SREJ requests that are received and for frames that are to be
306 * retransmitted. These seq_list functions implement a singly-linked
307 * list in an array, where membership in the list can also be checked
308 * in constant time. Items can also be added to the tail of the list
309 * and removed from the head in constant time, without further memory
310 * allocs or frees.
311 */
312
313static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
314{
315 size_t alloc_size, i;
316
317 /* Allocated size is a power of 2 to map sequence numbers
318 * (which may be up to 14 bits) in to a smaller array that is
319 * sized for the negotiated ERTM transmit windows.
320 */
321 alloc_size = roundup_pow_of_two(size);
322
323 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
324 if (!seq_list->list)
325 return -ENOMEM;
326
327 seq_list->mask = alloc_size - 1;
328 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
329 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
330 for (i = 0; i < alloc_size; i++)
331 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
332
333 return 0;
334}
335
336static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
337{
338 kfree(seq_list->list);
339}
340
341static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
342 u16 seq)
343{
344 /* Constant-time check for list membership */
345 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
346}
347
03a0c5d6 348static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
3c588192 349{
03a0c5d6 350 u16 seq = seq_list->head;
3c588192
MM		 351 u16 mask = seq_list->mask;
352
03a0c5d6
JH		 353 seq_list->head = seq_list->list[seq & mask];
354 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
355
356 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
357 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
358 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192 359 }
3c588192 360
03a0c5d6 361 return seq;
3c588192
MM		 362}
363
364static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
365{
f522ae36 366 u16 i;
3c588192 367
f522ae36
GP		 368 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
369 return;
370
371 for (i = 0; i <= seq_list->mask; i++)
372 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
373
374 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
375 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 376}
377
378static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
379{
380 u16 mask = seq_list->mask;
381
382 /* All appends happen in constant time */
383
f522ae36
GP		 384 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
385 return;
3c588192 386
f522ae36
GP		 387 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
388 seq_list->head = seq;
389 else
390 seq_list->list[seq_list->tail & mask] = seq;
391
392 seq_list->tail = seq;
393 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 394}
395
721c4181 396static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 397{
721c4181 398 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 399 chan_timer.work);
3df91ea2 400 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 401 int reason;
402
e05dcc32 403 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 404
3df91ea2 405 mutex_lock(&conn->chan_lock);
6be36555 406 l2cap_chan_lock(chan);
ab07801d 407
89bc500e 408 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 409 reason = ECONNREFUSED;
89bc500e 410 else if (chan->state == BT_CONNECT &&
2d792818 411 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 412 reason = ECONNREFUSED;
413 else
414 reason = ETIMEDOUT;
415
0f852724 416 l2cap_chan_close(chan, reason);
ab07801d 417
6be36555 418 l2cap_chan_unlock(chan);
ab07801d 419
80b98027 420 chan->ops->close(chan);
3df91ea2
AE		 421 mutex_unlock(&conn->chan_lock);
422
371fd835 423 l2cap_chan_put(chan);
ab07801d
GP		 424}
425
eef1d9b6 426struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 427{
428 struct l2cap_chan *chan;
429
430 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
431 if (!chan)
432 return NULL;
433
c03b355e
AE		 434 mutex_init(&chan->lock);
435
ff714119
JH		 436 /* Set default lock nesting level */
437 atomic_set(&chan->nesting, L2CAP_NESTING_NORMAL);
438
333055f2 439 write_lock(&chan_list_lock);
23691d75 440 list_add(&chan->global_l, &chan_list);
333055f2 441 write_unlock(&chan_list_lock);
23691d75 442
721c4181 443 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 444
89bc500e
GP		 445 chan->state = BT_OPEN;
446
144ad330 447 kref_init(&chan->kref);
71ba0e56 448
2827011f
MM		 449 /* This flag is cleared in l2cap_chan_ready() */
450 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
451
eef1d9b6 452 BT_DBG("chan %p", chan);
abc545b8 453
48454079
GP		 454 return chan;
455}
6b8d4a6a 456EXPORT_SYMBOL_GPL(l2cap_chan_create);
48454079 457
144ad330 458static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 459{
144ad330
SS		 460 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
461
4af66c69
JK		 462 BT_DBG("chan %p", chan);
463
333055f2 464 write_lock(&chan_list_lock);
23691d75 465 list_del(&chan->global_l);
333055f2 466 write_unlock(&chan_list_lock);
23691d75 467
4af66c69 468 kfree(chan);
6ff5abbf
GP		 469}
470
30648372
JK		 471void l2cap_chan_hold(struct l2cap_chan *c)
472{
144ad330 473 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 474
144ad330 475 kref_get(&c->kref);
30648372
JK		 476}
477
478void l2cap_chan_put(struct l2cap_chan *c)
479{
144ad330 480 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 481
144ad330 482 kref_put(&c->kref, l2cap_chan_destroy);
30648372 483}
6b8d4a6a 484EXPORT_SYMBOL_GPL(l2cap_chan_put);
30648372 485
bd4b1653
AE		 486void l2cap_chan_set_defaults(struct l2cap_chan *chan)
487{
488 chan->fcs = L2CAP_FCS_CRC16;
489 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
490 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
491 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
6a5e8165
JR		 492 chan->remote_max_tx = chan->max_tx;
493 chan->remote_tx_win = chan->tx_win;
c20f8e35 494 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653 495 chan->sec_level = BT_SECURITY_LOW;
6a5e8165
JR		 496 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
497 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
498 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
499 chan->conf_state = 0;
bd4b1653
AE		 500
501 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
502}
6b8d4a6a 503EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
bd4b1653 504
0ce43ce6 505static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 506{
0ce43ce6
JH		 507 chan->sdu = NULL;
508 chan->sdu_last_frag = NULL;
509 chan->sdu_len = 0;
0cd75f7e 510 chan->tx_credits = 0;
f15b8ecf 511 chan->rx_credits = le_max_credits;
d1d79413 512 chan->mps = min_t(u16, chan->imtu, le_default_mps);
0ce43ce6
JH		 513
514 skb_queue_head_init(&chan->tx_q);
38319713
JH		 515}
516
93c3e8f5 517void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 518{
af05b30b 519 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 520 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 521
9f5a0d7b 522 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 523
8c1d787b 524 chan->conn = conn;
0139418c 525
5491120e
AE		 526 switch (chan->chan_type) {
527 case L2CAP_CHAN_CONN_ORIENTED:
21626e62
JH		 528 /* Alloc CID for connection-oriented socket */
529 chan->scid = l2cap_alloc_cid(conn);
530 if (conn->hcon->type == ACL_LINK)
0c1bc5c6 531 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 532 break;
533
534 case L2CAP_CHAN_CONN_LESS:
0139418c 535 /* Connectionless socket */
fe4128e0
GP		 536 chan->scid = L2CAP_CID_CONN_LESS;
537 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 538 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 539 break;
540
2338a7e0
JH		 541 case L2CAP_CHAN_FIXED:
542 /* Caller will set CID and CID specific MTU values */
416fa752
AE		 543 break;
544
5491120e 545 default:
0139418c 546 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 547 chan->scid = L2CAP_CID_SIGNALING;
548 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 549 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 550 }
551
8f7975b1
AE		 552 chan->local_id = L2CAP_BESTEFFORT_ID;
553 chan->local_stype = L2CAP_SERV_BESTEFFORT;
554 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
555 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
556 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 557 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 558
371fd835 559 l2cap_chan_hold(chan);
baa7e1fa 560
c16900cf
JH		 561 /* Only keep a reference for fixed channels if they requested it */
562 if (chan->chan_type != L2CAP_CHAN_FIXED ||
563 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
564 hci_conn_hold(conn->hcon);
5ee9891d 565
3df91ea2 566 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 567}
568
466f8004 569void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 570{
571 mutex_lock(&conn->chan_lock);
572 __l2cap_chan_add(conn, chan);
3df91ea2 573 mutex_unlock(&conn->chan_lock);
0139418c
MH		 574}
575
466f8004 576void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 577{
8c1d787b 578 struct l2cap_conn *conn = chan->conn;
0139418c 579
c9b66675 580 __clear_chan_timer(chan);
0139418c 581
49d11741
JH		 582 BT_DBG("chan %p, conn %p, err %d, state %s", chan, conn, err,
583 state_to_string(chan->state));
0139418c 584
72847ce0
JH		 585 chan->ops->teardown(chan, err);
586
8e87d142 587 if (conn) {
56f60984 588 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 589 /* Delete from channel list */
3df91ea2 590 list_del(&chan->list);
3d57dc68 591
371fd835 592 l2cap_chan_put(chan);
baa7e1fa 593
8c1d787b 594 chan->conn = NULL;
3cabbfda 595
c16900cf
JH		 596 /* Reference was only held for non-fixed channels or
597 * fixed channels that explicitly requested it using the
598 * FLAG_HOLD_HCI_CONN flag.
599 */
600 if (chan->chan_type != L2CAP_CHAN_FIXED ||
601 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
76a68ba0 602 hci_conn_drop(conn->hcon);
56f60984
AE		 603
604 if (mgr && mgr->bredr_chan == chan)
605 mgr->bredr_chan = NULL;
0139418c
MH		 606 }
607
419e08c1
AE		 608 if (chan->hs_hchan) {
609 struct hci_chan *hs_hchan = chan->hs_hchan;
610
611 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
612 amp_disconnect_logical_link(hs_hchan);
613 }
614
2827011f 615 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 616 return;
2ead70b8 617
ee556f66
GP		 618 switch(chan->mode) {
619 case L2CAP_MODE_BASIC:
620 break;
c13ffa62 621
38319713 622 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 623 skb_queue_purge(&chan->tx_q);
38319713
JH		 624 break;
625
ee556f66 626 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 627 __clear_retrans_timer(chan);
628 __clear_monitor_timer(chan);
629 __clear_ack_timer(chan);
c13ffa62 630
f1c6775b 631 skb_queue_purge(&chan->srej_q);
c13ffa62 632
3c588192
MM		 633 l2cap_seq_list_free(&chan->srej_list);
634 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 635
636 /* fall through */
637
638 case L2CAP_MODE_STREAMING:
639 skb_queue_purge(&chan->tx_q);
640 break;
c13ffa62 641 }
ee556f66
GP		 642
643 return;
0139418c 644}
6b8d4a6a 645EXPORT_SYMBOL_GPL(l2cap_chan_del);
0139418c 646
f3d82d0c 647static void l2cap_conn_update_id_addr(struct work_struct *work)
387a33e3 648{
f3d82d0c
JH		 649 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
650 id_addr_update_work);
651 struct hci_conn *hcon = conn->hcon;
387a33e3
JH		 652 struct l2cap_chan *chan;
653
654 mutex_lock(&conn->chan_lock);
655
656 list_for_each_entry(chan, &conn->chan_l, list) {
657 l2cap_chan_lock(chan);
658 bacpy(&chan->dst, &hcon->dst);
a250e048 659 chan->dst_type = bdaddr_dst_type(hcon);
387a33e3
JH		 660 l2cap_chan_unlock(chan);
661 }
662
663 mutex_unlock(&conn->chan_lock);
664}
665
27e2d4c8
JH		 666static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
667{
668 struct l2cap_conn *conn = chan->conn;
669 struct l2cap_le_conn_rsp rsp;
670 u16 result;
671
672 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
673 result = L2CAP_CR_AUTHORIZATION;
674 else
675 result = L2CAP_CR_BAD_PSM;
676
677 l2cap_state_change(chan, BT_DISCONN);
678
679 rsp.dcid = cpu_to_le16(chan->scid);
680 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 681 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 682 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 683 rsp.result = cpu_to_le16(result);
684
685 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
686 &rsp);
687}
688
791d60f7
JH		 689static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
690{
691 struct l2cap_conn *conn = chan->conn;
692 struct l2cap_conn_rsp rsp;
693 u16 result;
694
695 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
696 result = L2CAP_CR_SEC_BLOCK;
697 else
698 result = L2CAP_CR_BAD_PSM;
699
700 l2cap_state_change(chan, BT_DISCONN);
701
702 rsp.scid = cpu_to_le16(chan->dcid);
703 rsp.dcid = cpu_to_le16(chan->scid);
704 rsp.result = cpu_to_le16(result);
dcf4adbf 705 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
791d60f7
JH		 706
707 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
708}
709
0f852724 710void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 711{
712 struct l2cap_conn *conn = chan->conn;
4519de9a 713
7eafc59e 714 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 715
89bc500e 716 switch (chan->state) {
4519de9a 717 case BT_LISTEN:
b699ec0d 718 chan->ops->teardown(chan, 0);
4519de9a
GP		 719 break;
720
721 case BT_CONNECTED:
722 case BT_CONFIG:
7b25c9b3 723 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
8d836d71 724 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 725 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 726 } else
727 l2cap_chan_del(chan, reason);
728 break;
729
730 case BT_CONNECT2:
791d60f7
JH		 731 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
732 if (conn->hcon->type == ACL_LINK)
733 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 734 else if (conn->hcon->type == LE_LINK)
735 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 736 }
737
738 l2cap_chan_del(chan, reason);
739 break;
740
741 case BT_CONNECT:
742 case BT_DISCONN:
743 l2cap_chan_del(chan, reason);
744 break;
745
746 default:
b699ec0d 747 chan->ops->teardown(chan, 0);
4519de9a
GP		 748 break;
749 }
750}
6b8d4a6a 751EXPORT_SYMBOL(l2cap_chan_close);
4519de9a 752
4343478f 753static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 754{
6a974b50
MH		 755 switch (chan->chan_type) {
756 case L2CAP_CHAN_RAW:
4343478f 757 switch (chan->sec_level) {
8556edd3 758 case BT_SECURITY_HIGH:
7d513e92 759 case BT_SECURITY_FIPS:
8556edd3
JH		 760 return HCI_AT_DEDICATED_BONDING_MITM;
761 case BT_SECURITY_MEDIUM:
762 return HCI_AT_DEDICATED_BONDING;
763 default:
764 return HCI_AT_NO_BONDING;
765 }
6a974b50 766 break;
3124b843 767 case L2CAP_CHAN_CONN_LESS:
dcf4adbf 768 if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) {
3124b843
MH		 769 if (chan->sec_level == BT_SECURITY_LOW)
770 chan->sec_level = BT_SECURITY_SDP;
771 }
7d513e92
MH		 772 if (chan->sec_level == BT_SECURITY_HIGH ||
773 chan->sec_level == BT_SECURITY_FIPS)
3124b843
MH		 774 return HCI_AT_NO_BONDING_MITM;
775 else
776 return HCI_AT_NO_BONDING;
777 break;
6a974b50 778 case L2CAP_CHAN_CONN_ORIENTED:
dcf4adbf 779 if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) {
6a974b50
MH		 780 if (chan->sec_level == BT_SECURITY_LOW)
781 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 782
7d513e92
MH		 783 if (chan->sec_level == BT_SECURITY_HIGH ||
784 chan->sec_level == BT_SECURITY_FIPS)
6a974b50
MH		 785 return HCI_AT_NO_BONDING_MITM;
786 else
787 return HCI_AT_NO_BONDING;
788 }
789 /* fall through */
790 default:
4343478f 791 switch (chan->sec_level) {
00ae4af9 792 case BT_SECURITY_HIGH:
7d513e92 793 case BT_SECURITY_FIPS:
8556edd3 794 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 795 case BT_SECURITY_MEDIUM:
8556edd3 796 return HCI_AT_GENERAL_BONDING;
00ae4af9 797 default:
8556edd3 798 return HCI_AT_NO_BONDING;
00ae4af9 799 }
6a974b50 800 break;
0684e5f9 801 }
8556edd3
JH		 802}
803
804/* Service level security */
e7cafc45 805int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator)
8556edd3 806{
8c1d787b 807 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 808 __u8 auth_type;
809
a17de2fe
JH		 810 if (conn->hcon->type == LE_LINK)
811 return smp_conn_security(conn->hcon, chan->sec_level);
812
4343478f 813 auth_type = l2cap_get_auth_type(chan);
79d554a6 814
e7cafc45
JH		 815 return hci_conn_security(conn->hcon, chan->sec_level, auth_type,
816 initiator);
79d554a6
MH		 817}
818
b5ad8b7f 819static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 820{
821 u8 id;
822
823 /* Get next available identificator.
824 * 1 - 128 are used by kernel.
825 * 129 - 199 are reserved.
826 * 200 - 254 are used by utilities like l2ping, etc.
827 */
828
5a54e7c8 829 mutex_lock(&conn->ident_lock);
4e8402a3
MH		 830
831 if (++conn->tx_ident > 128)
832 conn->tx_ident = 1;
833
834 id = conn->tx_ident;
835
5a54e7c8 836 mutex_unlock(&conn->ident_lock);
4e8402a3
MH		 837
838 return id;
839}
840
2d792818
GP		 841static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
842 void *data)
4e8402a3
MH		 843{
844 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 845 u8 flags;
4e8402a3
MH		 846
847 BT_DBG("code 0x%2.2x", code);
848
849 if (!skb)
9a9c6a34 850 return;
4e8402a3 851
f6af675e
SW		 852 /* Use NO_FLUSH if supported or we have an LE link (which does
853 * not support auto-flushing packets) */
854 if (lmp_no_flush_capable(conn->hcon->hdev) ||
855 conn->hcon->type == LE_LINK)
e702112f
AE		 856 flags = ACL_START_NO_FLUSH;
857 else
858 flags = ACL_START;
859
14b12d0b 860 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 861 skb->priority = HCI_PRIO_MAX;
14b12d0b 862
73d80deb
LAD		 863 hci_send_acl(conn->hchan, skb, flags);
864}
865
02b0fbb9
MM		 866static bool __chan_is_moving(struct l2cap_chan *chan)
867{
868 return chan->move_state != L2CAP_MOVE_STABLE &&
869 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
870}
871
73d80deb
LAD		 872static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
873{
874 struct hci_conn *hcon = chan->conn->hcon;
875 u16 flags;
876
877 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 878 skb->priority);
73d80deb 879
d5f8a75d
MM		 880 if (chan->hs_hcon && !__chan_is_moving(chan)) {
881 if (chan->hs_hchan)
882 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
883 else
884 kfree_skb(skb);
885
886 return;
887 }
888
f6af675e
SW		 889 /* Use NO_FLUSH for LE links (where this is the only option) or
890 * if the BR/EDR link supports it and flushing has not been
891 * explicitly requested (through FLAG_FLUSHABLE).
892 */
893 if (hcon->type == LE_LINK ||
894 (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
895 lmp_no_flush_capable(hcon->hdev)))
73d80deb
LAD		 896 flags = ACL_START_NO_FLUSH;
897 else
898 flags = ACL_START;
14b12d0b 899
73d80deb
LAD		 900 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
901 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 902}
903
b76bbd66
MM		 904static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
905{
906 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
907 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
908
909 if (enh & L2CAP_CTRL_FRAME_TYPE) {
910 /* S-Frame */
911 control->sframe = 1;
912 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
913 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
914
915 control->sar = 0;
916 control->txseq = 0;
917 } else {
918 /* I-Frame */
919 control->sframe = 0;
920 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
921 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
922
923 control->poll = 0;
924 control->super = 0;
925 }
926}
927
b76bbd66
MM		 928static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
929{
930 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
931 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
932
933 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
934 /* S-Frame */
935 control->sframe = 1;
936 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
937 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
938
939 control->sar = 0;
940 control->txseq = 0;
941 } else {
942 /* I-Frame */
943 control->sframe = 0;
944 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
945 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
946
947 control->poll = 0;
948 control->super = 0;
949 }
950}
951
952static inline void __unpack_control(struct l2cap_chan *chan,
953 struct sk_buff *skb)
954{
955 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
956 __unpack_extended_control(get_unaligned_le32(skb->data),
957 &bt_cb(skb)->control);
cec8ab6e 958 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 959 } else {
960 __unpack_enhanced_control(get_unaligned_le16(skb->data),
961 &bt_cb(skb)->control);
cec8ab6e 962 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 963 }
964}
965
b5c6aaed
MM		 966static u32 __pack_extended_control(struct l2cap_ctrl *control)
967{
968 u32 packed;
969
970 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
971 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
972
973 if (control->sframe) {
974 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
975 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
976 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
977 } else {
978 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
979 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
980 }
981
982 return packed;
983}
984
985static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
986{
987 u16 packed;
988
989 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
990 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
991
992 if (control->sframe) {
993 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
994 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
995 packed |= L2CAP_CTRL_FRAME_TYPE;
996 } else {
997 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
998 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
999 }
1000
1001 return packed;
1002}
1003
b76bbd66
MM		 1004static inline void __pack_control(struct l2cap_chan *chan,
1005 struct l2cap_ctrl *control,
1006 struct sk_buff *skb)
1007{
1008 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1009 put_unaligned_le32(__pack_extended_control(control),
1010 skb->data + L2CAP_HDR_SIZE);
1011 } else {
1012 put_unaligned_le16(__pack_enhanced_control(control),
1013 skb->data + L2CAP_HDR_SIZE);
1014 }
1015}
1016
ba7aa64f
GP		 1017static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
1018{
1019 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1020 return L2CAP_EXT_HDR_SIZE;
1021 else
1022 return L2CAP_ENH_HDR_SIZE;
1023}
1024
a67d7f6f
MM		 1025static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
1026 u32 control)
b5c6aaed
MM		 1027{
1028 struct sk_buff *skb;
1029 struct l2cap_hdr *lh;
ba7aa64f 1030 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 1031
1032 if (chan->fcs == L2CAP_FCS_CRC16)
1033 hlen += L2CAP_FCS_SIZE;
1034
a67d7f6f 1035 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 1036
b5c6aaed 1037 if (!skb)
a67d7f6f 1038 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 1039
1040 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1041 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1042 lh->cid = cpu_to_le16(chan->dcid);
1043
a67d7f6f
MM		 1044 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1045 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1046 else
1047 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 1048
1049 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 1050 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 1051 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1052 }
1053
1054 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 1055 return skb;
1056}
1057
1058static void l2cap_send_sframe(struct l2cap_chan *chan,
1059 struct l2cap_ctrl *control)
1060{
1061 struct sk_buff *skb;
1062 u32 control_field;
1063
1064 BT_DBG("chan %p, control %p", chan, control);
1065
1066 if (!control->sframe)
1067 return;
1068
b99e13ad
MM		 1069 if (__chan_is_moving(chan))
1070 return;
1071
a67d7f6f
MM		 1072 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1073 !control->poll)
1074 control->final = 1;
1075
1076 if (control->super == L2CAP_SUPER_RR)
1077 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1078 else if (control->super == L2CAP_SUPER_RNR)
1079 set_bit(CONN_RNR_SENT, &chan->conn_state);
1080
1081 if (control->super != L2CAP_SUPER_SREJ) {
1082 chan->last_acked_seq = control->reqseq;
1083 __clear_ack_timer(chan);
1084 }
1085
1086 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1087 control->final, control->poll, control->super);
1088
1089 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1090 control_field = __pack_extended_control(control);
1091 else
1092 control_field = __pack_enhanced_control(control);
1093
1094 skb = l2cap_create_sframe_pdu(chan, control_field);
1095 if (!IS_ERR(skb))
1096 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1097}
1098
c9e3d5e0 1099static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1100{
c9e3d5e0
MM		 1101 struct l2cap_ctrl control;
1102
1103 BT_DBG("chan %p, poll %d", chan, poll);
1104
1105 memset(&control, 0, sizeof(control));
1106 control.sframe = 1;
1107 control.poll = poll;
1108
1109 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1110 control.super = L2CAP_SUPER_RNR;
1111 else
1112 control.super = L2CAP_SUPER_RR;
b5c6aaed 1113
c9e3d5e0
MM		 1114 control.reqseq = chan->buffer_seq;
1115 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1116}
1117
b4450035 1118static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1119{
5ff6f34d
JH		 1120 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
1121 return true;
1122
c1360a1c 1123 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1124}
1125
1df7b17a 1126static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1127{
1df7b17a 1128 struct l2cap_conn *conn = chan->conn;
80d58d0b 1129 struct hci_dev *hdev;
1df7b17a
MH		 1130 bool amp_available = false;
1131
0bd49fc7 1132 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
1df7b17a
MH		 1133 return false;
1134
0bd49fc7 1135 if (!(conn->remote_fixed_chan & L2CAP_FC_A2MP))
1df7b17a 1136 return false;
80d58d0b
MH		 1137
1138 read_lock(&hci_dev_list_lock);
1df7b17a 1139 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1140 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1141 test_bit(HCI_UP, &hdev->flags)) {
1142 amp_available = true;
1143 break;
1144 }
1145 }
80d58d0b
MH		 1146 read_unlock(&hci_dev_list_lock);
1147
1df7b17a
MH		 1148 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1149 return amp_available;
848566b3
MH		 1150
1151 return false;
93c3e8f5
AE		 1152}
1153
5ce66b59
AE		 1154static bool l2cap_check_efs(struct l2cap_chan *chan)
1155{
1156 /* Check EFS parameters */
1157 return true;
1158}
1159
2766be48 1160void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1161{
1162 struct l2cap_conn *conn = chan->conn;
1163 struct l2cap_conn_req req;
1164
1165 req.scid = cpu_to_le16(chan->scid);
1166 req.psm = chan->psm;
1167
1168 chan->ident = l2cap_get_ident(conn);
1169
1170 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1171
1172 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1173}
1174
8eb200bd
MM		 1175static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1176{
1177 struct l2cap_create_chan_req req;
1178 req.scid = cpu_to_le16(chan->scid);
1179 req.psm = chan->psm;
1180 req.amp_id = amp_id;
1181
1182 chan->ident = l2cap_get_ident(chan->conn);
1183
1184 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1185 sizeof(req), &req);
1186}
1187
02b0fbb9
MM		 1188static void l2cap_move_setup(struct l2cap_chan *chan)
1189{
1190 struct sk_buff *skb;
1191
1192 BT_DBG("chan %p", chan);
1193
1194 if (chan->mode != L2CAP_MODE_ERTM)
1195 return;
1196
1197 __clear_retrans_timer(chan);
1198 __clear_monitor_timer(chan);
1199 __clear_ack_timer(chan);
1200
1201 chan->retry_count = 0;
1202 skb_queue_walk(&chan->tx_q, skb) {
1203 if (bt_cb(skb)->control.retries)
1204 bt_cb(skb)->control.retries = 1;
1205 else
1206 break;
1207 }
1208
1209 chan->expected_tx_seq = chan->buffer_seq;
1210
1211 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1212 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1213 l2cap_seq_list_clear(&chan->retrans_list);
1214 l2cap_seq_list_clear(&chan->srej_list);
1215 skb_queue_purge(&chan->srej_q);
1216
1217 chan->tx_state = L2CAP_TX_STATE_XMIT;
1218 chan->rx_state = L2CAP_RX_STATE_MOVE;
1219
1220 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1221}
1222
5f3847a4
MM		 1223static void l2cap_move_done(struct l2cap_chan *chan)
1224{
1225 u8 move_role = chan->move_role;
1226 BT_DBG("chan %p", chan);
1227
1228 chan->move_state = L2CAP_MOVE_STABLE;
1229 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1230
1231 if (chan->mode != L2CAP_MODE_ERTM)
1232 return;
1233
1234 switch (move_role) {
1235 case L2CAP_MOVE_ROLE_INITIATOR:
1236 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1237 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1238 break;
1239 case L2CAP_MOVE_ROLE_RESPONDER:
1240 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1241 break;
1242 }
1243}
1244
9f0caeb1
VCG		 1245static void l2cap_chan_ready(struct l2cap_chan *chan)
1246{
2827011f 1247 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1248 chan->conf_state = 0;
1249 __clear_chan_timer(chan);
1250
0ce43ce6
JH		 1251 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1252 chan->ops->suspend(chan);
177f8f2b 1253
54a59aa2 1254 chan->state = BT_CONNECTED;
9f0caeb1 1255
fd83e2c2 1256 chan->ops->ready(chan);
9f0caeb1
VCG		 1257}
1258
f1496dee
JH		 1259static void l2cap_le_connect(struct l2cap_chan *chan)
1260{
1261 struct l2cap_conn *conn = chan->conn;
1262 struct l2cap_le_conn_req req;
1263
595177f3
JH		 1264 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1265 return;
1266
f1496dee
JH		 1267 req.psm = chan->psm;
1268 req.scid = cpu_to_le16(chan->scid);
1269 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1270 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1271 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1272
1273 chan->ident = l2cap_get_ident(conn);
1274
1275 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1276 sizeof(req), &req);
1277}
1278
1279static void l2cap_le_start(struct l2cap_chan *chan)
1280{
1281 struct l2cap_conn *conn = chan->conn;
1282
1283 if (!smp_conn_security(conn->hcon, chan->sec_level))
1284 return;
1285
1286 if (!chan->psm) {
1287 l2cap_chan_ready(chan);
1288 return;
1289 }
1290
1291 if (chan->state == BT_CONNECT)
1292 l2cap_le_connect(chan);
1293}
1294
93c3e8f5
AE		 1295static void l2cap_start_connection(struct l2cap_chan *chan)
1296{
1297 if (__amp_capable(chan)) {
1298 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1299 a2mp_discover_amp(chan);
f1496dee
JH		 1300 } else if (chan->conn->hcon->type == LE_LINK) {
1301 l2cap_le_start(chan);
93c3e8f5
AE		 1302 } else {
1303 l2cap_send_conn_req(chan);
1304 }
1305}
1306
aeaeb4bb
JH		 1307static void l2cap_request_info(struct l2cap_conn *conn)
1308{
1309 struct l2cap_info_req req;
1310
1311 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1312 return;
1313
1314 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1315
1316 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1317 conn->info_ident = l2cap_get_ident(conn);
1318
1319 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1320
1321 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1322 sizeof(req), &req);
1323}
1324
fc7f8a7e 1325static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1326{
8c1d787b 1327 struct l2cap_conn *conn = chan->conn;
79d554a6 1328
9f0caeb1 1329 if (conn->hcon->type == LE_LINK) {
96ac34fb 1330 l2cap_le_start(chan);
9f0caeb1
VCG		 1331 return;
1332 }
1333
aeaeb4bb
JH		 1334 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) {
1335 l2cap_request_info(conn);
1336 return;
1337 }
79d554a6 1338
aeaeb4bb
JH		 1339 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1340 return;
79d554a6 1341
aeaeb4bb
JH		 1342 if (l2cap_chan_check_security(chan, true) &&
1343 __l2cap_no_conn_pending(chan))
1344 l2cap_start_connection(chan);
79d554a6
MH		 1345}
1346
cf6c2c0b
GP		 1347static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1348{
1349 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1350 if (!disable_ertm)
cf6c2c0b
GP		 1351 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1352
1353 switch (mode) {
1354 case L2CAP_MODE_ERTM:
1355 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1356 case L2CAP_MODE_STREAMING:
1357 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1358 default:
1359 return 0x00;
1360 }
1361}
1362
5e4e3972 1363static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1364{
5e4e3972 1365 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1366 struct l2cap_disconn_req req;
1367
c13ffa62
GP		 1368 if (!conn)
1369 return;
1370
aad3d0e3 1371 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1372 __clear_retrans_timer(chan);
1373 __clear_monitor_timer(chan);
1374 __clear_ack_timer(chan);
c13ffa62
GP		 1375 }
1376
2338a7e0 1377 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1378 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1379 return;
1380 }
1381
fe4128e0
GP		 1382 req.dcid = cpu_to_le16(chan->dcid);
1383 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1384 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1385 sizeof(req), &req);
c13ffa62 1386
f8e73017 1387 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1388}
1389
1da177e4 1390/* ---- L2CAP connections ---- */
4e8402a3
MH		 1391static void l2cap_conn_start(struct l2cap_conn *conn)
1392{
3df91ea2 1393 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1394
1395 BT_DBG("conn %p", conn);
1396
3df91ea2 1397 mutex_lock(&conn->chan_lock);
4e8402a3 1398
3df91ea2 1399 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1400 l2cap_chan_lock(chan);
4e8402a3 1401
715ec005 1402 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb 1403 l2cap_chan_ready(chan);
6be36555 1404 l2cap_chan_unlock(chan);
79d554a6
MH		 1405 continue;
1406 }
1407
89bc500e 1408 if (chan->state == BT_CONNECT) {
e7cafc45 1409 if (!l2cap_chan_check_security(chan, true) ||
2d792818 1410 !__l2cap_no_conn_pending(chan)) {
6be36555 1411 l2cap_chan_unlock(chan);
47731de7
GP		 1412 continue;
1413 }
79d554a6 1414
c1360a1c 1415 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1416 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1417 &chan->conf_state)) {
89bc500e 1418 l2cap_chan_close(chan, ECONNRESET);
6be36555 1419 l2cap_chan_unlock(chan);
47731de7 1420 continue;
b1235d79 1421 }
47731de7 1422
93c3e8f5 1423 l2cap_start_connection(chan);
47731de7 1424
89bc500e 1425 } else if (chan->state == BT_CONNECT2) {
79d554a6 1426 struct l2cap_conn_rsp rsp;
e9aeb2dd 1427 char buf[128];
fe4128e0
GP		 1428 rsp.scid = cpu_to_le16(chan->dcid);
1429 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1430
e7cafc45 1431 if (l2cap_chan_check_security(chan, false)) {
bdc25783 1432 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
dcf4adbf
JP		 1433 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1434 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1435 chan->ops->defer(chan);
f66dc81f
MH		 1436
1437 } else {
acdcabf5 1438 l2cap_state_change(chan, BT_CONFIG);
dcf4adbf
JP		 1439 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1440 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1441 }
79d554a6 1442 } else {
dcf4adbf
JP		 1443 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1444 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1445 }
1446
fc7f8a7e 1447 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1448 sizeof(rsp), &rsp);
e9aeb2dd 1449
c1360a1c 1450 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1451 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1452 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1453 continue;
1454 }
1455
c1360a1c 1456 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1457 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1458 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1459 chan->num_conf_req++;
4e8402a3
MH		 1460 }
1461
6be36555 1462 l2cap_chan_unlock(chan);
4e8402a3
MH		 1463 }
1464
3df91ea2 1465 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1466}
1467
b62f328b
VT		 1468static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1469{
cc8dba2b 1470 struct hci_conn *hcon = conn->hcon;
dcc36c16 1471 struct hci_dev *hdev = hcon->hdev;
b62f328b 1472
e760ec12 1473 BT_DBG("%s conn %p", hdev->name, conn);
b62f328b 1474
e760ec12
JH		 1475 /* For outgoing pairing which doesn't necessarily have an
1476 * associated socket (e.g. mgmt_pair_device).
1477 */
1478 if (hcon->out)
1479 smp_conn_security(hcon, hcon->pending_sec_level);
cc8dba2b 1480
80afeb6c
MH		 1481 /* For LE slave connections, make sure the connection interval
1482 * is in the range of the minium and maximum interval that has
1483 * been configured for this connection. If not, then trigger
1484 * the connection update procedure.
1485 */
40bef302 1486 if (hcon->role == HCI_ROLE_SLAVE &&
80afeb6c
MH		 1487 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1488 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1489 struct l2cap_conn_param_update_req req;
1490
1491 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1492 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1493 req.latency = cpu_to_le16(hcon->le_conn_latency);
1494 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1495
1496 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1497 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1498 }
b62f328b
VT		 1499}
1500
4e8402a3
MH		 1501static void l2cap_conn_ready(struct l2cap_conn *conn)
1502{
48454079 1503 struct l2cap_chan *chan;
cc110922 1504 struct hci_conn *hcon = conn->hcon;
4e8402a3 1505
79d554a6 1506 BT_DBG("conn %p", conn);
4e8402a3 1507
aeaeb4bb
JH		 1508 if (hcon->type == ACL_LINK)
1509 l2cap_request_info(conn);
1510
e760ec12
JH		 1511 mutex_lock(&conn->chan_lock);
1512
3df91ea2 1513 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1514
6be36555 1515 l2cap_chan_lock(chan);
4e8402a3 1516
2338a7e0 1517 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1518 l2cap_chan_unlock(chan);
1519 continue;
1520 }
1521
cc110922 1522 if (hcon->type == LE_LINK) {
f1496dee 1523 l2cap_le_start(chan);
63128451 1524 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb
JH		 1525 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
1526 l2cap_chan_ready(chan);
1c244f79 1527 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1528 l2cap_do_start(chan);
1c244f79 1529 }
4e8402a3 1530
6be36555 1531 l2cap_chan_unlock(chan);
4e8402a3 1532 }
79d554a6 1533
3df91ea2 1534 mutex_unlock(&conn->chan_lock);
61a939c6 1535
79a05727
JH		 1536 if (hcon->type == LE_LINK)
1537 l2cap_le_conn_ready(conn);
1538
61a939c6 1539 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1540}
1541
1542/* Notify sockets that we cannot guaranty reliability anymore */
1543static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1544{
48454079 1545 struct l2cap_chan *chan;
4e8402a3
MH		 1546
1547 BT_DBG("conn %p", conn);
1548
3df91ea2 1549 mutex_lock(&conn->chan_lock);
4e8402a3 1550
3df91ea2 1551 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1552 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1553 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1554 }
1555
3df91ea2 1556 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1557}
1558
f878fcad 1559static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1560{
f878fcad 1561 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1562 info_timer.work);
4e8402a3 1563
984947dc 1564 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1565 conn->info_ident = 0;
984947dc 1566
4e8402a3
MH		 1567 l2cap_conn_start(conn);
1568}
1569
2c8e1411
DH		 1570/*
1571 * l2cap_user
1572 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1573 * callback is called during registration. The ->remove callback is called
1574 * during unregistration.
1575 * An l2cap_user object can either be explicitly unregistered or when the
1576 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1577 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1578 * External modules must own a reference to the l2cap_conn object if they intend
1579 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1580 * any time if they don't.
1581 */
1582
1583int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1584{
1585 struct hci_dev *hdev = conn->hcon->hdev;
1586 int ret;
1587
1588 /* We need to check whether l2cap_conn is registered. If it is not, we
1589 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1590 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1591 * relies on the parent hci_conn object to be locked. This itself relies
1592 * on the hci_dev object to be locked. So we must lock the hci device
1593 * here, too. */
1594
1595 hci_dev_lock(hdev);
1596
1597 if (user->list.next || user->list.prev) {
1598 ret = -EINVAL;
1599 goto out_unlock;
1600 }
1601
1602 /* conn->hchan is NULL after l2cap_conn_del() was called */
1603 if (!conn->hchan) {
1604 ret = -ENODEV;
1605 goto out_unlock;
1606 }
1607
1608 ret = user->probe(conn, user);
1609 if (ret)
1610 goto out_unlock;
1611
1612 list_add(&user->list, &conn->users);
1613 ret = 0;
1614
1615out_unlock:
1616 hci_dev_unlock(hdev);
1617 return ret;
1618}
1619EXPORT_SYMBOL(l2cap_register_user);
1620
1621void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1622{
1623 struct hci_dev *hdev = conn->hcon->hdev;
1624
1625 hci_dev_lock(hdev);
1626
1627 if (!user->list.next || !user->list.prev)
1628 goto out_unlock;
1629
1630 list_del(&user->list);
1631 user->list.next = NULL;
1632 user->list.prev = NULL;
1633 user->remove(conn, user);
1634
1635out_unlock:
1636 hci_dev_unlock(hdev);
1637}
1638EXPORT_SYMBOL(l2cap_unregister_user);
1639
1640static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1641{
1642 struct l2cap_user *user;
1643
1644 while (!list_empty(&conn->users)) {
1645 user = list_first_entry(&conn->users, struct l2cap_user, list);
1646 list_del(&user->list);
1647 user->list.next = NULL;
1648 user->list.prev = NULL;
1649 user->remove(conn, user);
1650 }
1651}
1652
5d3de7df
VCG		 1653static void l2cap_conn_del(struct hci_conn *hcon, int err)
1654{
1655 struct l2cap_conn *conn = hcon->l2cap_data;
1656 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1657
1658 if (!conn)
1659 return;
1660
1661 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1662
1663 kfree_skb(conn->rx_skb);
1664
61a939c6 1665 skb_queue_purge(&conn->pending_rx);
7ab56c3a
JT		 1666
1667 /* We can not call flush_work(&conn->pending_rx_work) here since we
1668 * might block if we are running on a worker from the same workqueue
1669 * pending_rx_work is waiting on.
1670 */
1671 if (work_pending(&conn->pending_rx_work))
1672 cancel_work_sync(&conn->pending_rx_work);
61a939c6 1673
f3d82d0c
JH		 1674 if (work_pending(&conn->id_addr_update_work))
1675 cancel_work_sync(&conn->id_addr_update_work);
1676
2c8e1411
DH		 1677 l2cap_unregister_all_users(conn);
1678
e31fb860
JH		 1679 /* Force the connection to be immediately dropped */
1680 hcon->disc_timeout = 0;
1681
3df91ea2
AE		 1682 mutex_lock(&conn->chan_lock);
1683
5d3de7df
VCG		 1684 /* Kill channels */
1685 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1686 l2cap_chan_hold(chan);
6be36555
AE		 1687 l2cap_chan_lock(chan);
1688
5d3de7df 1689 l2cap_chan_del(chan, err);
6be36555
AE		 1690
1691 l2cap_chan_unlock(chan);
1692
80b98027 1693 chan->ops->close(chan);
61d6ef3e 1694 l2cap_chan_put(chan);
5d3de7df
VCG		 1695 }
1696
3df91ea2
AE		 1697 mutex_unlock(&conn->chan_lock);
1698
73d80deb
LAD		 1699 hci_chan_del(conn->hchan);
1700
5d3de7df 1701 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1702 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1703
5d3de7df 1704 hcon->l2cap_data = NULL;
9c903e37
DH		 1705 conn->hchan = NULL;
1706 l2cap_conn_put(conn);
5d3de7df
VCG		 1707}
1708
9c903e37
DH		 1709static void l2cap_conn_free(struct kref *ref)
1710{
1711 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1712
1713 hci_conn_put(conn->hcon);
1714 kfree(conn);
1715}
1716
51bb8457 1717struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
9c903e37
DH		 1718{
1719 kref_get(&conn->ref);
51bb8457 1720 return conn;
9c903e37
DH		 1721}
1722EXPORT_SYMBOL(l2cap_conn_get);
1723
1724void l2cap_conn_put(struct l2cap_conn *conn)
1725{
1726 kref_put(&conn->ref, l2cap_conn_free);
1727}
1728EXPORT_SYMBOL(l2cap_conn_put);
1729
1da177e4 1730/* ---- Socket interface ---- */
1da177e4 1731
c2287681 1732/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1733 * Returns closest match.
1734 */
c2287681
IY		 1735static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1736 bdaddr_t *src,
bf20fd4e
JH		 1737 bdaddr_t *dst,
1738 u8 link_type)
1da177e4 1739{
23691d75 1740 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1741
23691d75 1742 read_lock(&chan_list_lock);
e0f0cb56 1743
23691d75 1744 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1745 if (state && c->state != state)
1da177e4
LT		 1746 continue;
1747
bf20fd4e
JH		 1748 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1749 continue;
1750
1751 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1752 continue;
1753
23691d75 1754 if (c->psm == psm) {
c2287681
IY		 1755 int src_match, dst_match;
1756 int src_any, dst_any;
1757
1da177e4 1758 /* Exact match. */
7eafc59e
MH		 1759 src_match = !bacmp(&c->src, src);
1760 dst_match = !bacmp(&c->dst, dst);
c2287681 1761 if (src_match && dst_match) {
a24cce14 1762 l2cap_chan_hold(c);
a7567b20 1763 read_unlock(&chan_list_lock);
23691d75
GP		 1764 return c;
1765 }
1da177e4
LT		 1766
1767 /* Closest match */
7eafc59e
MH		 1768 src_any = !bacmp(&c->src, BDADDR_ANY);
1769 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1770 if ((src_match && dst_any) || (src_any && dst_match) ||
1771 (src_any && dst_any))
23691d75 1772 c1 = c;
1da177e4
LT		 1773 }
1774 }
1da177e4 1775
a24cce14
JH		 1776 if (c1)
1777 l2cap_chan_hold(c1);
1778
23691d75 1779 read_unlock(&chan_list_lock);
e0f0cb56 1780
23691d75 1781 return c1;
1da177e4
LT		 1782}
1783
721c4181 1784static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1785{
721c4181 1786 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1787 monitor_timer.work);
e90bac06 1788
525cd185 1789 BT_DBG("chan %p", chan);
0e98958d 1790
6be36555
AE		 1791 l2cap_chan_lock(chan);
1792
80909e04 1793 if (!chan->conn) {
6be36555 1794 l2cap_chan_unlock(chan);
8d7e1c7f 1795 l2cap_chan_put(chan);
e90bac06
GP		 1796 return;
1797 }
1798
401bb1f7 1799 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1800
6be36555 1801 l2cap_chan_unlock(chan);
8d7e1c7f 1802 l2cap_chan_put(chan);
e90bac06
GP		 1803}
1804
721c4181 1805static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1806{
721c4181 1807 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1808 retrans_timer.work);
e90bac06 1809
49208c9c 1810 BT_DBG("chan %p", chan);
0e98958d 1811
6be36555
AE		 1812 l2cap_chan_lock(chan);
1813
80909e04
MM		 1814 if (!chan->conn) {
1815 l2cap_chan_unlock(chan);
1816 l2cap_chan_put(chan);
1817 return;
1818 }
6be36555 1819
401bb1f7 1820 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1821 l2cap_chan_unlock(chan);
8d7e1c7f 1822 l2cap_chan_put(chan);
e90bac06
GP		 1823}
1824
d660366d
GP		 1825static void l2cap_streaming_send(struct l2cap_chan *chan,
1826 struct sk_buff_head *skbs)
6840ed07 1827{
ccbb84af 1828 struct sk_buff *skb;
3733937d 1829 struct l2cap_ctrl *control;
6840ed07 1830
3733937d
MM		 1831 BT_DBG("chan %p, skbs %p", chan, skbs);
1832
b99e13ad
MM		 1833 if (__chan_is_moving(chan))
1834 return;
1835
3733937d
MM		 1836 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1837
1838 while (!skb_queue_empty(&chan->tx_q)) {
1839
1840 skb = skb_dequeue(&chan->tx_q);
1841
1842 bt_cb(skb)->control.retries = 1;
1843 control = &bt_cb(skb)->control;
1844
1845 control->reqseq = 0;
1846 control->txseq = chan->next_tx_seq;
1847
1848 __pack_control(chan, control, skb);
6840ed07 1849
47d1ec61 1850 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1851 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1852 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1853 }
1854
4343478f 1855 l2cap_do_send(chan, skb);
6840ed07 1856
b4400672 1857 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1858
836be934 1859 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1860 chan->frames_sent++;
6840ed07 1861 }
6840ed07
GP		 1862}
1863
67c9e840 1864static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1865{
1866 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1867 struct l2cap_ctrl *control;
1868 int sent = 0;
1869
1870 BT_DBG("chan %p", chan);
1c2acffb 1871
89bc500e 1872 if (chan->state != BT_CONNECTED)
c13ffa62 1873 return -ENOTCONN;
e90bac06 1874
94122bbe
MM		 1875 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1876 return 0;
1877
b99e13ad
MM		 1878 if (__chan_is_moving(chan))
1879 return 0;
1880
18a48e76
MM		 1881 while (chan->tx_send_head &&
1882 chan->unacked_frames < chan->remote_tx_win &&
1883 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1884
18a48e76 1885 skb = chan->tx_send_head;
e90bac06 1886
18a48e76
MM		 1887 bt_cb(skb)->control.retries = 1;
1888 control = &bt_cb(skb)->control;
95ffa978 1889
e2ab4353 1890 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1891 control->final = 1;
e2ab4353 1892
18a48e76
MM		 1893 control->reqseq = chan->buffer_seq;
1894 chan->last_acked_seq = chan->buffer_seq;
1895 control->txseq = chan->next_tx_seq;
1c2acffb 1896
18a48e76 1897 __pack_control(chan, control, skb);
e90bac06 1898
47d1ec61 1899 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1900 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1901 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1902 }
1903
18a48e76
MM		 1904 /* Clone after data has been modified. Data is assumed to be
1905 read-only (for locking purposes) on cloned sk_buffs.
1906 */
1907 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1908
18a48e76
MM		 1909 if (!tx_skb)
1910 break;
1c2acffb 1911
18a48e76 1912 __set_retrans_timer(chan);
836be934
AE		 1913
1914 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1915 chan->unacked_frames++;
6a026610 1916 chan->frames_sent++;
18a48e76 1917 sent++;
1c2acffb 1918
58d35f87
GP		 1919 if (skb_queue_is_last(&chan->tx_q, skb))
1920 chan->tx_send_head = NULL;
1c2acffb 1921 else
58d35f87 1922 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1923
1924 l2cap_do_send(chan, tx_skb);
b4400672 1925 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1926 }
1927
b4400672
AE		 1928 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1929 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1930
1931 return sent;
9e917af1
GP		 1932}
1933
e1fbd4c1
MM		 1934static void l2cap_ertm_resend(struct l2cap_chan *chan)
1935{
1936 struct l2cap_ctrl control;
1937 struct sk_buff *skb;
1938 struct sk_buff *tx_skb;
1939 u16 seq;
1940
1941 BT_DBG("chan %p", chan);
1942
1943 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1944 return;
1945
b99e13ad
MM		 1946 if (__chan_is_moving(chan))
1947 return;
1948
e1fbd4c1
MM		 1949 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1950 seq = l2cap_seq_list_pop(&chan->retrans_list);
1951
1952 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1953 if (!skb) {
1954 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1955 seq);
e1fbd4c1
MM		 1956 continue;
1957 }
1958
1959 bt_cb(skb)->control.retries++;
1960 control = bt_cb(skb)->control;
1961
1962 if (chan->max_tx != 0 &&
1963 bt_cb(skb)->control.retries > chan->max_tx) {
1964 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1965 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1966 l2cap_seq_list_clear(&chan->retrans_list);
1967 break;
1968 }
1969
1970 control.reqseq = chan->buffer_seq;
1971 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1972 control.final = 1;
1973 else
1974 control.final = 0;
1975
1976 if (skb_cloned(skb)) {
1977 /* Cloned sk_buffs are read-only, so we need a
1978 * writeable copy
1979 */
8bcde1f2 1980 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1981 } else {
8bcde1f2 1982 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1983 }
1984
1985 if (!tx_skb) {
1986 l2cap_seq_list_clear(&chan->retrans_list);
1987 break;
1988 }
1989
1990 /* Update skb contents */
1991 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1992 put_unaligned_le32(__pack_extended_control(&control),
1993 tx_skb->data + L2CAP_HDR_SIZE);
1994 } else {
1995 put_unaligned_le16(__pack_enhanced_control(&control),
1996 tx_skb->data + L2CAP_HDR_SIZE);
1997 }
1998
13cac152 1999 /* Update FCS */
e1fbd4c1 2000 if (chan->fcs == L2CAP_FCS_CRC16) {
13cac152
LR		 2001 u16 fcs = crc16(0, (u8 *) tx_skb->data,
2002 tx_skb->len - L2CAP_FCS_SIZE);
2003 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
2004 L2CAP_FCS_SIZE);
e1fbd4c1
MM		 2005 }
2006
2007 l2cap_do_send(chan, tx_skb);
2008
2009 BT_DBG("Resent txseq %d", control.txseq);
2010
2011 chan->last_acked_seq = chan->buffer_seq;
2012 }
2013}
2014
f80842a8
MM		 2015static void l2cap_retransmit(struct l2cap_chan *chan,
2016 struct l2cap_ctrl *control)
2017{
2018 BT_DBG("chan %p, control %p", chan, control);
2019
2020 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2021 l2cap_ertm_resend(chan);
2022}
2023
d2a7ac5d
MM		 2024static void l2cap_retransmit_all(struct l2cap_chan *chan,
2025 struct l2cap_ctrl *control)
2026{
e1fbd4c1
MM		 2027 struct sk_buff *skb;
2028
2029 BT_DBG("chan %p, control %p", chan, control);
2030
2031 if (control->poll)
2032 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2033
2034 l2cap_seq_list_clear(&chan->retrans_list);
2035
2036 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2037 return;
2038
2039 if (chan->unacked_frames) {
2040 skb_queue_walk(&chan->tx_q, skb) {
2041 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2042 skb == chan->tx_send_head)
e1fbd4c1
MM		 2043 break;
2044 }
2045
2046 skb_queue_walk_from(&chan->tx_q, skb) {
2047 if (skb == chan->tx_send_head)
2048 break;
2049
2050 l2cap_seq_list_append(&chan->retrans_list,
2051 bt_cb(skb)->control.txseq);
2052 }
2053
2054 l2cap_ertm_resend(chan);
2055 }
d2a7ac5d
MM		 2056}
2057
0a0aba42 2058static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2059{
0a0aba42
MM		 2060 struct l2cap_ctrl control;
2061 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2062 chan->last_acked_seq);
2063 int threshold;
9e917af1 2064
0a0aba42
MM		 2065 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2066 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2067
0a0aba42
MM		 2068 memset(&control, 0, sizeof(control));
2069 control.sframe = 1;
dfc909be 2070
0a0aba42
MM		 2071 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2072 chan->rx_state == L2CAP_RX_STATE_RECV) {
2073 __clear_ack_timer(chan);
2074 control.super = L2CAP_SUPER_RNR;
2075 control.reqseq = chan->buffer_seq;
2076 l2cap_send_sframe(chan, &control);
2077 } else {
2078 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2079 l2cap_ertm_send(chan);
2080 /* If any i-frames were sent, they included an ack */
2081 if (chan->buffer_seq == chan->last_acked_seq)
2082 frames_to_ack = 0;
2083 }
dfc909be 2084
c20f8e35 2085 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2086 * Calculate without mul or div
2087 */
c20f8e35 2088 threshold = chan->ack_win;
0a0aba42
MM		 2089 threshold += threshold << 1;
2090 threshold >>= 2;
2091
b4400672 2092 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2093 threshold);
2094
2095 if (frames_to_ack >= threshold) {
2096 __clear_ack_timer(chan);
2097 control.super = L2CAP_SUPER_RR;
2098 control.reqseq = chan->buffer_seq;
2099 l2cap_send_sframe(chan, &control);
2100 frames_to_ack = 0;
2101 }
1c2acffb 2102
0a0aba42
MM		 2103 if (frames_to_ack)
2104 __set_ack_timer(chan);
2105 }
b17e73bb
SJ		 2106}
2107
04124681
GP		 2108static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2109 struct msghdr *msg, int len,
2110 int count, struct sk_buff *skb)
1c2acffb 2111{
0952a57a 2112 struct l2cap_conn *conn = chan->conn;
1c2acffb 2113 struct sk_buff **frag;
90338947 2114 int sent = 0;
1da177e4 2115
17836394 2116 if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count)
1c2acffb 2117 return -EFAULT;
1da177e4
LT		 2118
2119 sent += count;
2120 len -= count;
2121
2122 /* Continuation fragments (no L2CAP header) */
2123 frag = &skb_shinfo(skb)->frag_list;
2124 while (len) {
fbe00700
GP		 2125 struct sk_buff *tmp;
2126
1da177e4
LT		 2127 count = min_t(unsigned int, conn->mtu, len);
2128
d9fbd02b 2129 tmp = chan->ops->alloc_skb(chan, 0, count,
fbe00700
GP		 2130 msg->msg_flags & MSG_DONTWAIT);
2131 if (IS_ERR(tmp))
2132 return PTR_ERR(tmp);
2133
2134 *frag = tmp;
2f7719ce 2135
17836394
AV		 2136 if (copy_from_iter(skb_put(*frag, count), count,
2137 &msg->msg_iter) != count)
1c2acffb 2138 return -EFAULT;
1da177e4
LT		 2139
2140 sent += count;
2141 len -= count;
2142
2d0ed3d5
GP		 2143 skb->len += (*frag)->len;
2144 skb->data_len += (*frag)->len;
2145
1da177e4
LT		 2146 frag = &(*frag)->next;
2147 }
1da177e4
LT		 2148
2149 return sent;
1c2acffb 2150}
1da177e4 2151
5e59b791 2152static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
8d46321c 2153 struct msghdr *msg, size_t len)
1c2acffb 2154{
8c1d787b 2155 struct l2cap_conn *conn = chan->conn;
1c2acffb 2156 struct sk_buff *skb;
03a51213 2157 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2158 struct l2cap_hdr *lh;
2159
8d46321c
MH		 2160 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2161 __le16_to_cpu(chan->psm), len);
1c2acffb
GP		 2162
2163 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2164
d9fbd02b 2165 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2166 msg->msg_flags & MSG_DONTWAIT);
2167 if (IS_ERR(skb))
2168 return skb;
1c2acffb
GP		 2169
2170 /* Create L2CAP header */
2171 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2172 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2173 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2174 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2175
0952a57a 2176 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2177 if (unlikely(err < 0)) {
2178 kfree_skb(skb);
2179 return ERR_PTR(err);
2180 }
2181 return skb;
2182}
2183
5e59b791 2184static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
8d46321c 2185 struct msghdr *msg, size_t len)
1c2acffb 2186{
8c1d787b 2187 struct l2cap_conn *conn = chan->conn;
1c2acffb 2188 struct sk_buff *skb;
f2ba7fae 2189 int err, count;
1c2acffb
GP		 2190 struct l2cap_hdr *lh;
2191
b4400672 2192 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2193
f2ba7fae 2194 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2195
d9fbd02b 2196 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
90338947
GP		 2197 msg->msg_flags & MSG_DONTWAIT);
2198 if (IS_ERR(skb))
2199 return skb;
1c2acffb
GP		 2200
2201 /* Create L2CAP header */
2202 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2203 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2204 lh->len = cpu_to_le16(len);
1c2acffb 2205
0952a57a 2206 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2207 if (unlikely(err < 0)) {
2208 kfree_skb(skb);
2209 return ERR_PTR(err);
2210 }
2211 return skb;
2212}
2213
ab0ff76d 2214static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2215 struct msghdr *msg, size_t len,
2216 u16 sdulen)
1c2acffb 2217{
8c1d787b 2218 struct l2cap_conn *conn = chan->conn;
1c2acffb 2219 struct sk_buff *skb;
e4ca6d98 2220 int err, count, hlen;
1c2acffb
GP		 2221 struct l2cap_hdr *lh;
2222
b4400672 2223 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2224
0ee0d208
GP		 2225 if (!conn)
2226 return ERR_PTR(-ENOTCONN);
2227
ba7aa64f 2228 hlen = __ertm_hdr_size(chan);
e4ca6d98 2229
c74e560c 2230 if (sdulen)
03a51213 2231 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2232
47d1ec61 2233 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2234 hlen += L2CAP_FCS_SIZE;
fcc203c3 2235
1c2acffb 2236 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2237
d9fbd02b 2238 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2239 msg->msg_flags & MSG_DONTWAIT);
2240 if (IS_ERR(skb))
2241 return skb;
1c2acffb
GP		 2242
2243 /* Create L2CAP header */
2244 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2245 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2246 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2247
18a48e76
MM		 2248 /* Control header is populated later */
2249 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2250 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2251 else
2252 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2253
c74e560c 2254 if (sdulen)
03a51213 2255 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2256
0952a57a 2257 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2258 if (unlikely(err < 0)) {
2259 kfree_skb(skb);
2260 return ERR_PTR(err);
2261 }
e90bac06 2262
18a48e76 2263 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2264 bt_cb(skb)->control.retries = 0;
1c2acffb 2265 return skb;
1da177e4
LT		 2266}
2267
94122bbe
MM		 2268static int l2cap_segment_sdu(struct l2cap_chan *chan,
2269 struct sk_buff_head *seg_queue,
2270 struct msghdr *msg, size_t len)
c74e560c 2271{
c74e560c 2272 struct sk_buff *skb;
94122bbe
MM		 2273 u16 sdu_len;
2274 size_t pdu_len;
94122bbe 2275 u8 sar;
c74e560c 2276
b4400672 2277 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2278
94122bbe
MM		 2279 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2280 * so fragmented skbs are not used. The HCI layer's handling
2281 * of fragmented skbs is not compatible with ERTM's queueing.
2282 */
c74e560c 2283
94122bbe
MM		 2284 /* PDU size is derived from the HCI MTU */
2285 pdu_len = chan->conn->mtu;
c74e560c 2286
a549574d
MM		 2287 /* Constrain PDU size for BR/EDR connections */
2288 if (!chan->hs_hcon)
2289 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2290
2291 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2292 if (chan->fcs)
2293 pdu_len -= L2CAP_FCS_SIZE;
2294
ba7aa64f 2295 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2296
2297 /* Remote device may have requested smaller PDUs */
2298 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2299
2300 if (len <= pdu_len) {
2301 sar = L2CAP_SAR_UNSEGMENTED;
2302 sdu_len = 0;
2303 pdu_len = len;
2304 } else {
2305 sar = L2CAP_SAR_START;
2306 sdu_len = len;
94122bbe
MM		 2307 }
2308
2309 while (len > 0) {
2310 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2311
c74e560c 2312 if (IS_ERR(skb)) {
94122bbe 2313 __skb_queue_purge(seg_queue);
c74e560c
GP		 2314 return PTR_ERR(skb);
2315 }
2316
94122bbe
MM		 2317 bt_cb(skb)->control.sar = sar;
2318 __skb_queue_tail(seg_queue, skb);
2319
2320 len -= pdu_len;
069cb270 2321 if (sdu_len)
94122bbe 2322 sdu_len = 0;
94122bbe
MM		 2323
2324 if (len <= pdu_len) {
2325 sar = L2CAP_SAR_END;
2326 pdu_len = len;
2327 } else {
2328 sar = L2CAP_SAR_CONTINUE;
2329 }
c74e560c 2330 }
c74e560c 2331
f0f62799 2332 return 0;
c74e560c
GP		 2333}
2334
177f8f2b
JH		 2335static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2336 struct msghdr *msg,
2337 size_t len, u16 sdulen)
2338{
2339 struct l2cap_conn *conn = chan->conn;
2340 struct sk_buff *skb;
2341 int err, count, hlen;
2342 struct l2cap_hdr *lh;
2343
2344 BT_DBG("chan %p len %zu", chan, len);
2345
2346 if (!conn)
2347 return ERR_PTR(-ENOTCONN);
2348
2349 hlen = L2CAP_HDR_SIZE;
2350
2351 if (sdulen)
2352 hlen += L2CAP_SDULEN_SIZE;
2353
2354 count = min_t(unsigned int, (conn->mtu - hlen), len);
2355
d9fbd02b 2356 skb = chan->ops->alloc_skb(chan, hlen, count,
177f8f2b
JH		 2357 msg->msg_flags & MSG_DONTWAIT);
2358 if (IS_ERR(skb))
2359 return skb;
2360
2361 /* Create L2CAP header */
2362 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2363 lh->cid = cpu_to_le16(chan->dcid);
2364 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2365
2366 if (sdulen)
2367 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2368
2369 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2370 if (unlikely(err < 0)) {
2371 kfree_skb(skb);
2372 return ERR_PTR(err);
2373 }
2374
2375 return skb;
2376}
2377
2378static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2379 struct sk_buff_head *seg_queue,
2380 struct msghdr *msg, size_t len)
2381{
2382 struct sk_buff *skb;
2383 size_t pdu_len;
2384 u16 sdu_len;
2385
2386 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2387
177f8f2b 2388 sdu_len = len;
72c6fb91 2389 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
177f8f2b
JH		 2390
2391 while (len > 0) {
2392 if (len <= pdu_len)
2393 pdu_len = len;
2394
2395 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2396 if (IS_ERR(skb)) {
2397 __skb_queue_purge(seg_queue);
2398 return PTR_ERR(skb);
2399 }
2400
2401 __skb_queue_tail(seg_queue, skb);
2402
2403 len -= pdu_len;
2404
2405 if (sdu_len) {
2406 sdu_len = 0;
2407 pdu_len += L2CAP_SDULEN_SIZE;
2408 }
2409 }
2410
2411 return 0;
2412}
2413
8d46321c 2414int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
9a91a04a 2415{
9a91a04a 2416 struct sk_buff *skb;
9a91a04a 2417 int err;
94122bbe 2418 struct sk_buff_head seg_queue;
9a91a04a 2419
31e8ce80
SWK		 2420 if (!chan->conn)
2421 return -ENOTCONN;
2422
9a91a04a 2423 /* Connectionless channel */
715ec005 2424 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
8d46321c 2425 skb = l2cap_create_connless_pdu(chan, msg, len);
9a91a04a
GP		 2426 if (IS_ERR(skb))
2427 return PTR_ERR(skb);
2428
ede81a2a
AK		 2429 /* Channel lock is released before requesting new skb and then
2430 * reacquired thus we need to recheck channel state.
2431 */
2432 if (chan->state != BT_CONNECTED) {
2433 kfree_skb(skb);
2434 return -ENOTCONN;
2435 }
2436
9a91a04a
GP		 2437 l2cap_do_send(chan, skb);
2438 return len;
2439 }
2440
2441 switch (chan->mode) {
38319713 2442 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2443 /* Check outgoing MTU */
2444 if (len > chan->omtu)
2445 return -EMSGSIZE;
2446
fad5fc89
JH		 2447 if (!chan->tx_credits)
2448 return -EAGAIN;
2449
177f8f2b
JH		 2450 __skb_queue_head_init(&seg_queue);
2451
2452 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2453
2454 if (chan->state != BT_CONNECTED) {
2455 __skb_queue_purge(&seg_queue);
2456 err = -ENOTCONN;
2457 }
2458
2459 if (err)
2460 return err;
2461
2462 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2463
2464 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2465 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2466 chan->tx_credits--;
2467 }
2468
2469 if (!chan->tx_credits)
2470 chan->ops->suspend(chan);
2471
2472 err = len;
2473
2474 break;
2475
fad5fc89 2476 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2477 /* Check outgoing MTU */
2478 if (len > chan->omtu)
2479 return -EMSGSIZE;
2480
2481 /* Create a basic PDU */
8d46321c 2482 skb = l2cap_create_basic_pdu(chan, msg, len);
9a91a04a
GP		 2483 if (IS_ERR(skb))
2484 return PTR_ERR(skb);
2485
ede81a2a
AK		 2486 /* Channel lock is released before requesting new skb and then
2487 * reacquired thus we need to recheck channel state.
2488 */
2489 if (chan->state != BT_CONNECTED) {
2490 kfree_skb(skb);
2491 return -ENOTCONN;
2492 }
2493
9a91a04a
GP		 2494 l2cap_do_send(chan, skb);
2495 err = len;
2496 break;
2497
2498 case L2CAP_MODE_ERTM:
2499 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2500 /* Check outgoing MTU */
2501 if (len > chan->omtu) {
2502 err = -EMSGSIZE;
2503 break;
2504 }
9a91a04a 2505
94122bbe 2506 __skb_queue_head_init(&seg_queue);
9a91a04a 2507
94122bbe
MM		 2508 /* Do segmentation before calling in to the state machine,
2509 * since it's possible to block while waiting for memory
2510 * allocation.
2511 */
2512 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2513
94122bbe
MM		 2514 /* The channel could have been closed while segmenting,
2515 * check that it is still connected.
2516 */
2517 if (chan->state != BT_CONNECTED) {
2518 __skb_queue_purge(&seg_queue);
2519 err = -ENOTCONN;
9a91a04a
GP		 2520 }
2521
94122bbe 2522 if (err)
9a91a04a 2523 break;
9a91a04a 2524
3733937d 2525 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2526 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2527 else
d660366d 2528 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2529
d660366d 2530 err = len;
9a91a04a 2531
94122bbe
MM		 2532 /* If the skbs were not queued for sending, they'll still be in
2533 * seg_queue and need to be purged.
2534 */
2535 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2536 break;
2537
2538 default:
2539 BT_DBG("bad state %1.1x", chan->mode);
2540 err = -EBADFD;
2541 }
2542
2543 return err;
2544}
6b8d4a6a 2545EXPORT_SYMBOL_GPL(l2cap_chan_send);
9a91a04a 2546
d2a7ac5d
MM		 2547static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2548{
bed68bde
MM		 2549 struct l2cap_ctrl control;
2550 u16 seq;
2551
b4400672 2552 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2553
2554 memset(&control, 0, sizeof(control));
2555 control.sframe = 1;
2556 control.super = L2CAP_SUPER_SREJ;
2557
2558 for (seq = chan->expected_tx_seq; seq != txseq;
2559 seq = __next_seq(chan, seq)) {
2560 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2561 control.reqseq = seq;
2562 l2cap_send_sframe(chan, &control);
2563 l2cap_seq_list_append(&chan->srej_list, seq);
2564 }
2565 }
2566
2567 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2568}
2569
2570static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2571{
bed68bde
MM		 2572 struct l2cap_ctrl control;
2573
2574 BT_DBG("chan %p", chan);
2575
2576 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2577 return;
2578
2579 memset(&control, 0, sizeof(control));
2580 control.sframe = 1;
2581 control.super = L2CAP_SUPER_SREJ;
2582 control.reqseq = chan->srej_list.tail;
2583 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2584}
2585
2586static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2587{
bed68bde
MM		 2588 struct l2cap_ctrl control;
2589 u16 initial_head;
2590 u16 seq;
2591
b4400672 2592 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2593
2594 memset(&control, 0, sizeof(control));
2595 control.sframe = 1;
2596 control.super = L2CAP_SUPER_SREJ;
2597
2598 /* Capture initial list head to allow only one pass through the list. */
2599 initial_head = chan->srej_list.head;
2600
2601 do {
2602 seq = l2cap_seq_list_pop(&chan->srej_list);
2603 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2604 break;
2605
2606 control.reqseq = seq;
2607 l2cap_send_sframe(chan, &control);
2608 l2cap_seq_list_append(&chan->srej_list, seq);
2609 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2610}
2611
608bcc6d
MM		 2612static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2613{
2614 struct sk_buff *acked_skb;
2615 u16 ackseq;
2616
b4400672 2617 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2618
2619 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2620 return;
2621
b4400672 2622 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2623 chan->expected_ack_seq, chan->unacked_frames);
2624
2625 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2626 ackseq = __next_seq(chan, ackseq)) {
2627
2628 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2629 if (acked_skb) {
2630 skb_unlink(acked_skb, &chan->tx_q);
2631 kfree_skb(acked_skb);
2632 chan->unacked_frames--;
2633 }
2634 }
2635
2636 chan->expected_ack_seq = reqseq;
2637
2638 if (chan->unacked_frames == 0)
2639 __clear_retrans_timer(chan);
2640
b4400672 2641 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2642}
2643
2644static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2645{
2646 BT_DBG("chan %p", chan);
2647
2648 chan->expected_tx_seq = chan->buffer_seq;
2649 l2cap_seq_list_clear(&chan->srej_list);
2650 skb_queue_purge(&chan->srej_q);
2651 chan->rx_state = L2CAP_RX_STATE_RECV;
2652}
2653
d660366d
GP		 2654static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2655 struct l2cap_ctrl *control,
2656 struct sk_buff_head *skbs, u8 event)
608bcc6d 2657{
608bcc6d
MM		 2658 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2659 event);
2660
2661 switch (event) {
2662 case L2CAP_EV_DATA_REQUEST:
2663 if (chan->tx_send_head == NULL)
2664 chan->tx_send_head = skb_peek(skbs);
2665
2666 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2667 l2cap_ertm_send(chan);
2668 break;
2669 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2670 BT_DBG("Enter LOCAL_BUSY");
2671 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2672
2673 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2674 /* The SREJ_SENT state must be aborted if we are to
2675 * enter the LOCAL_BUSY state.
2676 */
2677 l2cap_abort_rx_srej_sent(chan);
2678 }
2679
2680 l2cap_send_ack(chan);
2681
2682 break;
2683 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2684 BT_DBG("Exit LOCAL_BUSY");
2685 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2686
2687 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2688 struct l2cap_ctrl local_control;
2689
2690 memset(&local_control, 0, sizeof(local_control));
2691 local_control.sframe = 1;
2692 local_control.super = L2CAP_SUPER_RR;
2693 local_control.poll = 1;
2694 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2695 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2696
2697 chan->retry_count = 1;
2698 __set_monitor_timer(chan);
2699 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2700 }
2701 break;
2702 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2703 l2cap_process_reqseq(chan, control->reqseq);
2704 break;
2705 case L2CAP_EV_EXPLICIT_POLL:
2706 l2cap_send_rr_or_rnr(chan, 1);
2707 chan->retry_count = 1;
2708 __set_monitor_timer(chan);
2709 __clear_ack_timer(chan);
2710 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2711 break;
2712 case L2CAP_EV_RETRANS_TO:
2713 l2cap_send_rr_or_rnr(chan, 1);
2714 chan->retry_count = 1;
2715 __set_monitor_timer(chan);
2716 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2717 break;
2718 case L2CAP_EV_RECV_FBIT:
2719 /* Nothing to process */
2720 break;
2721 default:
2722 break;
2723 }
608bcc6d
MM		 2724}
2725
d660366d
GP		 2726static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2727 struct l2cap_ctrl *control,
2728 struct sk_buff_head *skbs, u8 event)
608bcc6d 2729{
608bcc6d
MM		 2730 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2731 event);
2732
2733 switch (event) {
2734 case L2CAP_EV_DATA_REQUEST:
2735 if (chan->tx_send_head == NULL)
2736 chan->tx_send_head = skb_peek(skbs);
2737 /* Queue data, but don't send. */
2738 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2739 break;
2740 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2741 BT_DBG("Enter LOCAL_BUSY");
2742 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2743
2744 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2745 /* The SREJ_SENT state must be aborted if we are to
2746 * enter the LOCAL_BUSY state.
2747 */
2748 l2cap_abort_rx_srej_sent(chan);
2749 }
2750
2751 l2cap_send_ack(chan);
2752
2753 break;
2754 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2755 BT_DBG("Exit LOCAL_BUSY");
2756 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2757
2758 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2759 struct l2cap_ctrl local_control;
2760 memset(&local_control, 0, sizeof(local_control));
2761 local_control.sframe = 1;
2762 local_control.super = L2CAP_SUPER_RR;
2763 local_control.poll = 1;
2764 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2765 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2766
2767 chan->retry_count = 1;
2768 __set_monitor_timer(chan);
2769 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2770 }
2771 break;
2772 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2773 l2cap_process_reqseq(chan, control->reqseq);
2774
2775 /* Fall through */
2776
2777 case L2CAP_EV_RECV_FBIT:
2778 if (control && control->final) {
2779 __clear_monitor_timer(chan);
2780 if (chan->unacked_frames > 0)
2781 __set_retrans_timer(chan);
2782 chan->retry_count = 0;
2783 chan->tx_state = L2CAP_TX_STATE_XMIT;
2784 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2785 }
2786 break;
2787 case L2CAP_EV_EXPLICIT_POLL:
2788 /* Ignore */
2789 break;
2790 case L2CAP_EV_MONITOR_TO:
2791 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2792 l2cap_send_rr_or_rnr(chan, 1);
2793 __set_monitor_timer(chan);
2794 chan->retry_count++;
2795 } else {
5e4e3972 2796 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2797 }
2798 break;
2799 default:
2800 break;
2801 }
608bcc6d
MM		 2802}
2803
d660366d
GP		 2804static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2805 struct sk_buff_head *skbs, u8 event)
608bcc6d 2806{
608bcc6d
MM		 2807 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2808 chan, control, skbs, event, chan->tx_state);
2809
2810 switch (chan->tx_state) {
2811 case L2CAP_TX_STATE_XMIT:
d660366d 2812 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2813 break;
2814 case L2CAP_TX_STATE_WAIT_F:
d660366d 2815 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2816 break;
2817 default:
2818 /* Ignore event */
2819 break;
2820 }
608bcc6d
MM		 2821}
2822
4b51dae9
MM		 2823static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2824 struct l2cap_ctrl *control)
2825{
2826 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2827 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2828}
2829
f80842a8
MM		 2830static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2831 struct l2cap_ctrl *control)
2832{
2833 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2834 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2835}
2836
1da177e4
LT		 2837/* Copy frame to all raw sockets on that connection */
2838static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2839{
1da177e4 2840 struct sk_buff *nskb;
48454079 2841 struct l2cap_chan *chan;
1da177e4
LT		 2842
2843 BT_DBG("conn %p", conn);
2844
3df91ea2 2845 mutex_lock(&conn->chan_lock);
3d57dc68 2846
3df91ea2 2847 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2848 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2849 continue;
2850
7f5396a7
GP		 2851 /* Don't send frame to the channel it came from */
2852 if (bt_cb(skb)->chan == chan)
1da177e4 2853 continue;
7f5396a7 2854
8bcde1f2 2855 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2856 if (!nskb)
1da177e4 2857 continue;
80b98027 2858 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2859 kfree_skb(nskb);
2860 }
3d57dc68 2861
3df91ea2 2862 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2863}
2864
2865/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2866static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2867 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2868{
2869 struct sk_buff *skb, **frag;
2870 struct l2cap_cmd_hdr *cmd;
2871 struct l2cap_hdr *lh;
2872 int len, count;
2873
b4400672
AE		 2874 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2875 conn, code, ident, dlen);
1da177e4 2876
300b962e
AL		 2877 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2878 return NULL;
2879
1da177e4
LT		 2880 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2881 count = min_t(unsigned int, conn->mtu, len);
2882
8bcde1f2 2883 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2884 if (!skb)
2885 return NULL;
2886
2887 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2888 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2889
2890 if (conn->hcon->type == LE_LINK)
dcf4adbf 2891 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2892 else
dcf4adbf 2893 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2894
2895 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2896 cmd->code = code;
2897 cmd->ident = ident;
aca3192c 2898 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2899
2900 if (dlen) {
2901 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2902 memcpy(skb_put(skb, count), data, count);
2903 data += count;
2904 }
2905
2906 len -= skb->len;
2907
2908 /* Continuation fragments (no L2CAP header) */
2909 frag = &skb_shinfo(skb)->frag_list;
2910 while (len) {
2911 count = min_t(unsigned int, conn->mtu, len);
2912
8bcde1f2 2913 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2914 if (!*frag)
2915 goto fail;
2916
2917 memcpy(skb_put(*frag, count), data, count);
2918
2919 len -= count;
2920 data += count;
2921
2922 frag = &(*frag)->next;
2923 }
2924
2925 return skb;
2926
2927fail:
2928 kfree_skb(skb);
2929 return NULL;
2930}
2931
2d792818
GP		 2932static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2933 unsigned long *val)
1da177e4
LT		 2934{
2935 struct l2cap_conf_opt *opt = *ptr;
2936 int len;
2937
2938 len = L2CAP_CONF_OPT_SIZE + opt->len;
2939 *ptr += len;
2940
2941 *type = opt->type;
2942 *olen = opt->len;
2943
2944 switch (opt->len) {
2945 case 1:
2946 *val = *((u8 *) opt->val);
2947 break;
2948
2949 case 2:
bfaaeb3e 2950 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2951 break;
2952
2953 case 4:
bfaaeb3e 2954 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2955 break;
2956
2957 default:
2958 *val = (unsigned long) opt->val;
2959 break;
2960 }
2961
b4400672 2962 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2963 return len;
2964}
2965
1da177e4
LT		 2966static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2967{
2968 struct l2cap_conf_opt *opt = *ptr;
2969
b4400672 2970 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2971
2972 opt->type = type;
2973 opt->len = len;
2974
2975 switch (len) {
2976 case 1:
2977 *((u8 *) opt->val) = val;
2978 break;
2979
2980 case 2:
4f8b691c 2981 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2982 break;
2983
2984 case 4:
4f8b691c 2985 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2986 break;
2987
2988 default:
2989 memcpy(opt->val, (void *) val, len);
2990 break;
2991 }
2992
2993 *ptr += L2CAP_CONF_OPT_SIZE + len;
2994}
2995
f89cef09
AE		 2996static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2997{
2998 struct l2cap_conf_efs efs;
2999
1ec918ce 3000 switch (chan->mode) {
f89cef09
AE		 3001 case L2CAP_MODE_ERTM:
3002 efs.id = chan->local_id;
3003 efs.stype = chan->local_stype;
3004 efs.msdu = cpu_to_le16(chan->local_msdu);
3005 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
dcf4adbf
JP		 3006 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
3007 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3008 break;
3009
3010 case L2CAP_MODE_STREAMING:
3011 efs.id = 1;
3012 efs.stype = L2CAP_SERV_BESTEFFORT;
3013 efs.msdu = cpu_to_le16(chan->local_msdu);
3014 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3015 efs.acc_lat = 0;
3016 efs.flush_to = 0;
3017 break;
3018
3019 default:
3020 return;
3021 }
3022
3023 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3024 (unsigned long) &efs);
f89cef09
AE		 3025}
3026
721c4181 3027static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3028{
721c4181 3029 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3030 ack_timer.work);
3031 u16 frames_to_ack;
c1b4f43b 3032
2fb9b3d4
GP		 3033 BT_DBG("chan %p", chan);
3034
6be36555
AE		 3035 l2cap_chan_lock(chan);
3036
0362520b
MM		 3037 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3038 chan->last_acked_seq);
6be36555 3039
0362520b
MM		 3040 if (frames_to_ack)
3041 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3042
0362520b 3043 l2cap_chan_unlock(chan);
09bfb2ee 3044 l2cap_chan_put(chan);
c1b4f43b
GP		 3045}
3046
466f8004 3047int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3048{
3c588192
MM		 3049 int err;
3050
105bdf9e
MM		 3051 chan->next_tx_seq = 0;
3052 chan->expected_tx_seq = 0;
42e5c802 3053 chan->expected_ack_seq = 0;
6a026610 3054 chan->unacked_frames = 0;
42e5c802 3055 chan->buffer_seq = 0;
6a026610 3056 chan->frames_sent = 0;
105bdf9e
MM		 3057 chan->last_acked_seq = 0;
3058 chan->sdu = NULL;
3059 chan->sdu_last_frag = NULL;
3060 chan->sdu_len = 0;
3061
d34c34fb
MM		 3062 skb_queue_head_init(&chan->tx_q);
3063
6ed971ca
MH		 3064 chan->local_amp_id = AMP_ID_BREDR;
3065 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3066 chan->move_state = L2CAP_MOVE_STABLE;
3067 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3068
105bdf9e
MM		 3069 if (chan->mode != L2CAP_MODE_ERTM)
3070 return 0;
3071
3072 chan->rx_state = L2CAP_RX_STATE_RECV;
3073 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3074
721c4181
GP		 3075 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3076 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3077 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3078
f1c6775b 3079 skb_queue_head_init(&chan->srej_q);
1890d36b 3080
3c588192
MM		 3081 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3082 if (err < 0)
3083 return err;
3084
9dc9affc
MM		 3085 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3086 if (err < 0)
3087 l2cap_seq_list_free(&chan->srej_list);
3088
3089 return err;
0565c1c2
GP		 3090}
3091
f2fcfcd6
GP		 3092static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3093{
3094 switch (mode) {
3095 case L2CAP_MODE_STREAMING:
3096 case L2CAP_MODE_ERTM:
3097 if (l2cap_mode_supported(mode, remote_feat_mask))
3098 return mode;
3099 /* fall through */
3100 default:
3101 return L2CAP_MODE_BASIC;
3102 }
3103}
3104
848566b3 3105static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3106{
0bd49fc7
JH		 3107 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3108 (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW));
6327eb98
AE		 3109}
3110
848566b3 3111static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3112{
0bd49fc7
JH		 3113 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3114 (conn->feat_mask & L2CAP_FEAT_EXT_FLOW));
f89cef09
AE		 3115}
3116
36c86c85
MM		 3117static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3118 struct l2cap_conf_rfc *rfc)
3119{
6ed971ca 3120 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3121 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3122
3123 /* Class 1 devices have must have ERTM timeouts
3124 * exceeding the Link Supervision Timeout. The
3125 * default Link Supervision Timeout for AMP
3126 * controllers is 10 seconds.
3127 *
3128 * Class 1 devices use 0xffffffff for their
3129 * best-effort flush timeout, so the clamping logic
3130 * will result in a timeout that meets the above
3131 * requirement. ERTM timeouts are 16-bit values, so
3132 * the maximum timeout is 65.535 seconds.
3133 */
3134
3135 /* Convert timeout to milliseconds and round */
3136 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3137
3138 /* This is the recommended formula for class 2 devices
3139 * that start ERTM timers when packets are sent to the
3140 * controller.
3141 */
3142 ertm_to = 3 * ertm_to + 500;
3143
3144 if (ertm_to > 0xffff)
3145 ertm_to = 0xffff;
3146
3147 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3148 rfc->monitor_timeout = rfc->retrans_timeout;
3149 } else {
dcf4adbf
JP		 3150 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3151 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
36c86c85
MM		 3152 }
3153}
3154
6327eb98
AE		 3155static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3156{
3157 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3158 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3159 /* use extended control field */
3160 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3161 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3162 } else {
6327eb98 3163 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3164 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3165 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3166 }
c20f8e35 3167 chan->ack_win = chan->tx_win;
6327eb98
AE		 3168}
3169
710f9b0a 3170static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3171{
1da177e4 3172 struct l2cap_conf_req *req = data;
0c1bc5c6 3173 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3174 void *ptr = req->data;
c8f79162 3175 u16 size;
1da177e4 3176
49208c9c 3177 BT_DBG("chan %p", chan);
1da177e4 3178
73ffa904 3179 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3180 goto done;
3181
0c1bc5c6 3182 switch (chan->mode) {
f2fcfcd6
GP		 3183 case L2CAP_MODE_STREAMING:
3184 case L2CAP_MODE_ERTM:
c1360a1c 3185 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3186 break;
85eb53c6 3187
848566b3 3188 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3189 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3190
2ba13ed6 3191 /* fall through */
f2fcfcd6 3192 default:
8c1d787b 3193 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3194 break;
3195 }
3196
3197done:
0c1bc5c6
GP		 3198 if (chan->imtu != L2CAP_DEFAULT_MTU)
3199 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3200
0c1bc5c6 3201 switch (chan->mode) {
65c7c491 3202 case L2CAP_MODE_BASIC:
6fea7ad1
MH		 3203 if (disable_ertm)
3204 break;
3205
8c1d787b 3206 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3207 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3208 break;
3209
62547752
GP		 3210 rfc.mode = L2CAP_MODE_BASIC;
3211 rfc.txwin_size = 0;
3212 rfc.max_transmit = 0;
3213 rfc.retrans_timeout = 0;
3214 rfc.monitor_timeout = 0;
3215 rfc.max_pdu_size = 0;
3216
63406504 3217 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3218 (unsigned long) &rfc);
65c7c491
MH		 3219 break;
3220
3221 case L2CAP_MODE_ERTM:
3222 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3223 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3224
3225 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3226
3227 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3228 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3229 L2CAP_FCS_SIZE);
c8f79162 3230 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3231
6327eb98
AE		 3232 l2cap_txwin_setup(chan);
3233
3234 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3235 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3236
63406504 3237 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3238 (unsigned long) &rfc);
63406504 3239
f89cef09
AE		 3240 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3241 l2cap_add_opt_efs(&ptr, chan);
3242
6327eb98
AE		 3243 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3244 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3245 chan->tx_win);
60918918
AE		 3246
3247 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3248 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3249 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3250 chan->fcs = L2CAP_FCS_NONE;
3251 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3252 chan->fcs);
3253 }
f2fcfcd6
GP		 3254 break;
3255
3256 case L2CAP_MODE_STREAMING:
273759e2 3257 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3258 rfc.mode = L2CAP_MODE_STREAMING;
3259 rfc.txwin_size = 0;
3260 rfc.max_transmit = 0;
3261 rfc.retrans_timeout = 0;
3262 rfc.monitor_timeout = 0;
c8f79162
AE		 3263
3264 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3265 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3266 L2CAP_FCS_SIZE);
c8f79162 3267 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3268
63406504 3269 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3270 (unsigned long) &rfc);
63406504 3271
f89cef09
AE		 3272 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3273 l2cap_add_opt_efs(&ptr, chan);
3274
60918918
AE		 3275 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3276 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3277 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3278 chan->fcs = L2CAP_FCS_NONE;
3279 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3280 chan->fcs);
3281 }
65c7c491
MH		 3282 break;
3283 }
1da177e4 3284
fe4128e0 3285 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3286 req->flags = cpu_to_le16(0);
1da177e4
LT		 3287
3288 return ptr - data;
3289}
3290
73ffa904 3291static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3292{
5dee9e7c
MH		 3293 struct l2cap_conf_rsp *rsp = data;
3294 void *ptr = rsp->data;
73ffa904
GP		 3295 void *req = chan->conf_req;
3296 int len = chan->conf_len;
5dee9e7c
MH		 3297 int type, hint, olen;
3298 unsigned long val;
6464f35f 3299 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3300 struct l2cap_conf_efs efs;
3301 u8 remote_efs = 0;
861d6882 3302 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3303 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3304 u16 size;
1da177e4 3305
73ffa904 3306 BT_DBG("chan %p", chan);
820ae1b8 3307
5dee9e7c
MH		 3308 while (len >= L2CAP_CONF_OPT_SIZE) {
3309 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3310
589d2746 3311 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3312 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3313
3314 switch (type) {
3315 case L2CAP_CONF_MTU:
861d6882 3316 mtu = val;
5dee9e7c
MH		 3317 break;
3318
3319 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3320 chan->flush_to = val;
5dee9e7c
MH		 3321 break;
3322
3323 case L2CAP_CONF_QOS:
3324 break;
3325
6464f35f
MH		 3326 case L2CAP_CONF_RFC:
3327 if (olen == sizeof(rfc))
3328 memcpy(&rfc, (void *) val, olen);
3329 break;
3330
fcc203c3
GP		 3331 case L2CAP_CONF_FCS:
3332 if (val == L2CAP_FCS_NONE)
f2592d3e 3333 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3334 break;
fcc203c3 3335
42dceae2
AE		 3336 case L2CAP_CONF_EFS:
3337 remote_efs = 1;
3338 if (olen == sizeof(efs))
3339 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3340 break;
3341
6327eb98 3342 case L2CAP_CONF_EWS:
0bd49fc7 3343 if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP))
6327eb98 3344 return -ECONNREFUSED;
fcc203c3 3345
6327eb98
AE		 3346 set_bit(FLAG_EXT_CTRL, &chan->flags);
3347 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3348 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3349 chan->remote_tx_win = val;
fcc203c3
GP		 3350 break;
3351
5dee9e7c
MH		 3352 default:
3353 if (hint)
3354 break;
3355
3356 result = L2CAP_CONF_UNKNOWN;
3357 *((u8 *) ptr++) = type;
3358 break;
3359 }
3360 }
3361
73ffa904 3362 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3363 goto done;
3364
0c1bc5c6 3365 switch (chan->mode) {
f2fcfcd6
GP		 3366 case L2CAP_MODE_STREAMING:
3367 case L2CAP_MODE_ERTM:
c1360a1c 3368 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3369 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3370 chan->conn->feat_mask);
85eb53c6
GP		 3371 break;
3372 }
3373
42dceae2 3374 if (remote_efs) {
848566b3 3375 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3376 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3377 else
3378 return -ECONNREFUSED;
3379 }
3380
0c1bc5c6 3381 if (chan->mode != rfc.mode)
f2fcfcd6 3382 return -ECONNREFUSED;
742e519b 3383
f2fcfcd6 3384 break;
f2fcfcd6
GP		 3385 }
3386
3387done:
0c1bc5c6 3388 if (chan->mode != rfc.mode) {
f2fcfcd6 3389 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3390 rfc.mode = chan->mode;
f2fcfcd6 3391
73ffa904 3392 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3393 return -ECONNREFUSED;
3394
2d792818
GP		 3395 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3396 (unsigned long) &rfc);
f2fcfcd6
GP		 3397 }
3398
5dee9e7c
MH		 3399 if (result == L2CAP_CONF_SUCCESS) {
3400 /* Configure output options and let the other side know
3401 * which ones we don't like. */
3402
f2fcfcd6
GP		 3403 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3404 result = L2CAP_CONF_UNACCEPT;
3405 else {
0c1bc5c6 3406 chan->omtu = mtu;
c1360a1c 3407 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3408 }
0c1bc5c6 3409 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3410
42dceae2
AE		 3411 if (remote_efs) {
3412 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3413 efs.stype != L2CAP_SERV_NOTRAFIC &&
3414 efs.stype != chan->local_stype) {
42dceae2
AE		 3415
3416 result = L2CAP_CONF_UNACCEPT;
3417
3418 if (chan->num_conf_req >= 1)
3419 return -ECONNREFUSED;
3420
3421 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3422 sizeof(efs),
3423 (unsigned long) &efs);
0e8b207e 3424 } else {
3e6b3b95 3425 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3426 result = L2CAP_CONF_PENDING;
3427 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3428 }
3429 }
3430
f2fcfcd6
GP		 3431 switch (rfc.mode) {
3432 case L2CAP_MODE_BASIC:
47d1ec61 3433 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3434 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3435 break;
3436
3437 case L2CAP_MODE_ERTM:
6327eb98
AE		 3438 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3439 chan->remote_tx_win = rfc.txwin_size;
3440 else
3441 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3442
2c03a7a4 3443 chan->remote_max_tx = rfc.max_transmit;
1c762159 3444
c8f79162 3445 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3446 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3447 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3448 rfc.max_pdu_size = cpu_to_le16(size);
3449 chan->remote_mps = size;
f2fcfcd6 3450
36c86c85 3451 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3452
c1360a1c 3453 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3454
3455 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3456 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3457
42dceae2
AE		 3458 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3459 chan->remote_id = efs.id;
3460 chan->remote_stype = efs.stype;
3461 chan->remote_msdu = le16_to_cpu(efs.msdu);
3462 chan->remote_flush_to =
2d792818 3463 le32_to_cpu(efs.flush_to);
42dceae2 3464 chan->remote_acc_lat =
2d792818 3465 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3466 chan->remote_sdu_itime =
3467 le32_to_cpu(efs.sdu_itime);
3468 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3469 sizeof(efs),
3470 (unsigned long) &efs);
42dceae2 3471 }
f2fcfcd6
GP		 3472 break;
3473
3474 case L2CAP_MODE_STREAMING:
c8f79162 3475 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3476 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3477 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3478 rfc.max_pdu_size = cpu_to_le16(size);
3479 chan->remote_mps = size;
f2fcfcd6 3480
c1360a1c 3481 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3482
2d792818
GP		 3483 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3484 (unsigned long) &rfc);
68ae6639 3485
f2fcfcd6
GP		 3486 break;
3487
3488 default:
5dee9e7c 3489 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3490
6464f35f 3491 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3492 rfc.mode = chan->mode;
f2fcfcd6 3493 }
6464f35f 3494
f2fcfcd6 3495 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3496 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3497 }
fe4128e0 3498 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3499 rsp->result = cpu_to_le16(result);
dcf4adbf 3500 rsp->flags = cpu_to_le16(0);
5dee9e7c
MH		 3501
3502 return ptr - data;
1da177e4
LT		 3503}
3504
2d792818
GP		 3505static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3506 void *data, u16 *result)
f2fcfcd6 3507{
f2fcfcd6
GP		 3508 struct l2cap_conf_req *req = data;
3509 void *ptr = req->data;
3510 int type, olen;
3511 unsigned long val;
36e999a8 3512 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3513 struct l2cap_conf_efs efs;
f2fcfcd6 3514
fe4128e0 3515 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3516
3517 while (len >= L2CAP_CONF_OPT_SIZE) {
3518 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3519
3520 switch (type) {
3521 case L2CAP_CONF_MTU:
3522 if (val < L2CAP_DEFAULT_MIN_MTU) {
3523 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3524 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3525 } else
0c1bc5c6
GP		 3526 chan->imtu = val;
3527 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3528 break;
3529
3530 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3531 chan->flush_to = val;
f2fcfcd6 3532 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3533 2, chan->flush_to);
f2fcfcd6
GP		 3534 break;
3535
3536 case L2CAP_CONF_RFC:
3537 if (olen == sizeof(rfc))
3538 memcpy(&rfc, (void *)val, olen);
3539
c1360a1c 3540 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3541 rfc.mode != chan->mode)
f2fcfcd6
GP		 3542 return -ECONNREFUSED;
3543
47d1ec61 3544 chan->fcs = 0;
f2fcfcd6
GP		 3545
3546 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3547 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3548 break;
6327eb98
AE		 3549
3550 case L2CAP_CONF_EWS:
c20f8e35 3551 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3552 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3553 chan->tx_win);
6327eb98 3554 break;
66af7aaf
AE		 3555
3556 case L2CAP_CONF_EFS:
3557 if (olen == sizeof(efs))
3558 memcpy(&efs, (void *)val, olen);
3559
3560 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3561 efs.stype != L2CAP_SERV_NOTRAFIC &&
3562 efs.stype != chan->local_stype)
66af7aaf
AE		 3563 return -ECONNREFUSED;
3564
2d792818
GP		 3565 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3566 (unsigned long) &efs);
66af7aaf 3567 break;
cbabee78
AE		 3568
3569 case L2CAP_CONF_FCS:
3570 if (*result == L2CAP_CONF_PENDING)
3571 if (val == L2CAP_FCS_NONE)
f2592d3e 3572 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3573 &chan->conf_state);
3574 break;
f2fcfcd6
GP		 3575 }
3576 }
3577
0c1bc5c6 3578 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3579 return -ECONNREFUSED;
3580
0c1bc5c6 3581 chan->mode = rfc.mode;
6c2ea7a8 3582
0e8b207e 3583 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3584 switch (rfc.mode) {
3585 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3586 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3587 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3588 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3589 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3590 chan->ack_win = min_t(u16, chan->ack_win,
3591 rfc.txwin_size);
66af7aaf
AE		 3592
3593 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3594 chan->local_msdu = le16_to_cpu(efs.msdu);
3595 chan->local_sdu_itime =
2d792818 3596 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3597 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3598 chan->local_flush_to =
2d792818 3599 le32_to_cpu(efs.flush_to);
66af7aaf 3600 }
f2fcfcd6 3601 break;
66af7aaf 3602
f2fcfcd6 3603 case L2CAP_MODE_STREAMING:
47d1ec61 3604 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3605 }
3606 }
3607
fe4128e0 3608 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3609 req->flags = cpu_to_le16(0);
f2fcfcd6
GP		 3610
3611 return ptr - data;
3612}
3613
2d792818
GP		 3614static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3615 u16 result, u16 flags)
1da177e4
LT		 3616{
3617 struct l2cap_conf_rsp *rsp = data;
3618 void *ptr = rsp->data;
1da177e4 3619
fe4128e0 3620 BT_DBG("chan %p", chan);
1da177e4 3621
fe4128e0 3622 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3623 rsp->result = cpu_to_le16(result);
aca3192c 3624 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3625
3626 return ptr - data;
3627}
3628
27e2d4c8
JH		 3629void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3630{
3631 struct l2cap_le_conn_rsp rsp;
3632 struct l2cap_conn *conn = chan->conn;
3633
3634 BT_DBG("chan %p", chan);
3635
3636 rsp.dcid = cpu_to_le16(chan->scid);
3637 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3638 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3639 rsp.credits = cpu_to_le16(chan->rx_credits);
dcf4adbf 3640 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
27e2d4c8
JH		 3641
3642 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3643 &rsp);
3644}
3645
8c1d787b 3646void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3647{
3648 struct l2cap_conn_rsp rsp;
8c1d787b 3649 struct l2cap_conn *conn = chan->conn;
710f9b0a 3650 u8 buf[128];
439f34ac 3651 u8 rsp_code;
710f9b0a 3652
fe4128e0
GP		 3653 rsp.scid = cpu_to_le16(chan->dcid);
3654 rsp.dcid = cpu_to_le16(chan->scid);
dcf4adbf
JP		 3655 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3656 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3657
3658 if (chan->hs_hcon)
3659 rsp_code = L2CAP_CREATE_CHAN_RSP;
3660 else
3661 rsp_code = L2CAP_CONN_RSP;
3662
3663 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3664
3665 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3666
c1360a1c 3667 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3668 return;
3669
710f9b0a 3670 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3671 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3672 chan->num_conf_req++;
3673}
3674
47d1ec61 3675static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3676{
7b1c0049
GP		 3677 int type, olen;
3678 unsigned long val;
c20f8e35
MM		 3679 /* Use sane default values in case a misbehaving remote device
3680 * did not send an RFC or extended window size option.
3681 */
3682 u16 txwin_ext = chan->ack_win;
3683 struct l2cap_conf_rfc rfc = {
3684 .mode = chan->mode,
dcf4adbf
JP		 3685 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3686 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
c20f8e35
MM		 3687 .max_pdu_size = cpu_to_le16(chan->imtu),
3688 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3689 };
7b1c0049 3690
47d1ec61 3691 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3692
0c1bc5c6 3693 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3694 return;
3695
3696 while (len >= L2CAP_CONF_OPT_SIZE) {
3697 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3698
c20f8e35
MM		 3699 switch (type) {
3700 case L2CAP_CONF_RFC:
3701 if (olen == sizeof(rfc))
3702 memcpy(&rfc, (void *)val, olen);
8f321f85 3703 break;
c20f8e35
MM		 3704 case L2CAP_CONF_EWS:
3705 txwin_ext = val;
3706 break;
3707 }
7b1c0049
GP		 3708 }
3709
7b1c0049
GP		 3710 switch (rfc.mode) {
3711 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3712 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3713 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3714 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3715 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3716 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3717 else
3718 chan->ack_win = min_t(u16, chan->ack_win,
3719 rfc.txwin_size);
7b1c0049
GP		 3720 break;
3721 case L2CAP_MODE_STREAMING:
47d1ec61 3722 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3723 }
3724}
3725
2d792818 3726static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3727 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3728 u8 *data)
4e8402a3 3729{
e2fd318e 3730 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3731
cb3b3152
JH		 3732 if (cmd_len < sizeof(*rej))
3733 return -EPROTO;
3734
e2fd318e 3735 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3736 return 0;
3737
3738 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3739 cmd->ident == conn->info_ident) {
17cd3f37 3740 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3741
3742 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3743 conn->info_ident = 0;
984947dc 3744
4e8402a3
MH		 3745 l2cap_conn_start(conn);
3746 }
3747
3748 return 0;
3749}
3750
1700915f
MM		 3751static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3752 struct l2cap_cmd_hdr *cmd,
3753 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3754{
1da177e4
LT		 3755 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3756 struct l2cap_conn_rsp rsp;
23691d75 3757 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3758 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3759
3760 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3761 __le16 psm = req->psm;
1da177e4 3762
097db76c 3763 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3764
3765 /* Check if we have socket listening on psm */
6f59b904 3766 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3767 &conn->hcon->dst, ACL_LINK);
23691d75 3768 if (!pchan) {
1da177e4
LT		 3769 result = L2CAP_CR_BAD_PSM;
3770 goto sendresp;
3771 }
3772
3df91ea2 3773 mutex_lock(&conn->chan_lock);
8ffb9290 3774 l2cap_chan_lock(pchan);
e0f0cb56 3775
e7c29cb1 3776 /* Check if the ACL is secure enough (if not SDP) */
dcf4adbf 3777 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3778 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3779 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3780 result = L2CAP_CR_SEC_BLOCK;
3781 goto response;
3782 }
3783
1da177e4
LT		 3784 result = L2CAP_CR_NO_MEM;
3785
2dfa1003
GP		 3786 /* Check if we already have channel with that dcid */
3787 if (__l2cap_get_chan_by_dcid(conn, scid))
3788 goto response;
3789
80b98027 3790 chan = pchan->ops->new_connection(pchan);
80808e43 3791 if (!chan)
1da177e4
LT		 3792 goto response;
3793
330b6c15
SS		 3794 /* For certain devices (ex: HID mouse), support for authentication,
3795 * pairing and bonding is optional. For such devices, inorder to avoid
3796 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3797 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3798 */
3799 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3800
7eafc59e
MH		 3801 bacpy(&chan->src, &conn->hcon->src);
3802 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 3803 chan->src_type = bdaddr_src_type(conn->hcon);
3804 chan->dst_type = bdaddr_dst_type(conn->hcon);
fe4128e0
GP		 3805 chan->psm = psm;
3806 chan->dcid = scid;
1700915f 3807 chan->local_amp_id = amp_id;
1da177e4 3808
6be36555 3809 __l2cap_chan_add(conn, chan);
48454079 3810
fe4128e0 3811 dcid = chan->scid;
1da177e4 3812
8d836d71 3813 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3814
fc7f8a7e 3815 chan->ident = cmd->ident;
1da177e4 3816
984947dc 3817 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
e7cafc45 3818 if (l2cap_chan_check_security(chan, false)) {
bdc25783 3819 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3820 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3821 result = L2CAP_CR_PEND;
3822 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3823 chan->ops->defer(chan);
f66dc81f 3824 } else {
1700915f
MM		 3825 /* Force pending result for AMP controllers.
3826 * The connection will succeed after the
3827 * physical link is up.
3828 */
6ed971ca 3829 if (amp_id == AMP_ID_BREDR) {
f93fa273 3830 l2cap_state_change(chan, BT_CONFIG);
1700915f 3831 result = L2CAP_CR_SUCCESS;
6ed971ca 3832 } else {
f93fa273 3833 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3834 result = L2CAP_CR_PEND;
1700915f 3835 }
f66dc81f
MH		 3836 status = L2CAP_CS_NO_INFO;
3837 }
79d554a6 3838 } else {
f93fa273 3839 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3840 result = L2CAP_CR_PEND;
3841 status = L2CAP_CS_AUTHEN_PEND;
3842 }
3843 } else {
f93fa273 3844 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3845 result = L2CAP_CR_PEND;
3846 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3847 }
3848
1da177e4 3849response:
8ffb9290 3850 l2cap_chan_unlock(pchan);
3df91ea2 3851 mutex_unlock(&conn->chan_lock);
a24cce14 3852 l2cap_chan_put(pchan);
1da177e4
LT		 3853
3854sendresp:
aca3192c
YH		 3855 rsp.scid = cpu_to_le16(scid);
3856 rsp.dcid = cpu_to_le16(dcid);
3857 rsp.result = cpu_to_le16(result);
3858 rsp.status = cpu_to_le16(status);
4c89b6aa 3859 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3860
3861 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3862 struct l2cap_info_req info;
dcf4adbf 3863 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3864
3865 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3866 conn->info_ident = l2cap_get_ident(conn);
3867
ba13ccd9 3868 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3869
2d792818
GP		 3870 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3871 sizeof(info), &info);
79d554a6
MH		 3872 }
3873
c1360a1c 3874 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3875 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3876 u8 buf[128];
c1360a1c 3877 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3878 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3879 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3880 chan->num_conf_req++;
e9aeb2dd 3881 }
1700915f
MM		 3882
3883 return chan;
4c89b6aa 3884}
e9aeb2dd 3885
4c89b6aa 3886static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3887 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3888{
7b064eda
JK		 3889 struct hci_dev *hdev = conn->hcon->hdev;
3890 struct hci_conn *hcon = conn->hcon;
3891
cb3b3152
JH		 3892 if (cmd_len < sizeof(struct l2cap_conn_req))
3893 return -EPROTO;
3894
7b064eda
JK		 3895 hci_dev_lock(hdev);
3896 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3897 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
48ec92fa 3898 mgmt_device_connected(hdev, hcon, 0, NULL, 0);
7b064eda
JK		 3899 hci_dev_unlock(hdev);
3900
300229f9 3901 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3902 return 0;
3903}
3904
5909cf30 3905static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3906 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3907 u8 *data)
1da177e4
LT		 3908{
3909 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3910 u16 scid, dcid, result, status;
48454079 3911 struct l2cap_chan *chan;
1da177e4 3912 u8 req[128];
3df91ea2 3913 int err;
1da177e4 3914
cb3b3152
JH		 3915 if (cmd_len < sizeof(*rsp))
3916 return -EPROTO;
3917
1da177e4
LT		 3918 scid = __le16_to_cpu(rsp->scid);
3919 dcid = __le16_to_cpu(rsp->dcid);
3920 result = __le16_to_cpu(rsp->result);
3921 status = __le16_to_cpu(rsp->status);
3922
1b009c98 3923 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3924 dcid, scid, result, status);
1da177e4 3925
3df91ea2
AE		 3926 mutex_lock(&conn->chan_lock);
3927
1da177e4 3928 if (scid) {
3df91ea2
AE		 3929 chan = __l2cap_get_chan_by_scid(conn, scid);
3930 if (!chan) {
21870b52 3931 err = -EBADSLT;
3df91ea2
AE		 3932 goto unlock;
3933 }
1da177e4 3934 } else {
3df91ea2
AE		 3935 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3936 if (!chan) {
21870b52 3937 err = -EBADSLT;
3df91ea2
AE		 3938 goto unlock;
3939 }
1da177e4
LT		 3940 }
3941
3df91ea2
AE		 3942 err = 0;
3943
6be36555 3944 l2cap_chan_lock(chan);
48454079 3945
1da177e4
LT		 3946 switch (result) {
3947 case L2CAP_CR_SUCCESS:
89bc500e 3948 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3949 chan->ident = 0;
fe4128e0 3950 chan->dcid = dcid;
c1360a1c 3951 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3952
c1360a1c 3953 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3954 break;
3955
1da177e4 3956 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3957 l2cap_build_conf_req(chan, req), req);
73ffa904 3958 chan->num_conf_req++;
1da177e4
LT		 3959 break;
3960
3961 case L2CAP_CR_PEND:
c1360a1c 3962 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3963 break;
3964
3965 default:
48454079 3966 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3967 break;
3968 }
3969
6be36555 3970 l2cap_chan_unlock(chan);
3df91ea2
AE		 3971
3972unlock:
3973 mutex_unlock(&conn->chan_lock);
3974
3975 return err;
1da177e4
LT		 3976}
3977
47d1ec61 3978static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3979{
3980 /* FCS is enabled only in ERTM or streaming mode, if one or both
3981 * sides request it.
3982 */
0c1bc5c6 3983 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3984 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3985 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3986 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3987}
3988
29d8a590
AE		 3989static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3990 u8 ident, u16 flags)
3991{
3992 struct l2cap_conn *conn = chan->conn;
3993
3994 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3995 flags);
3996
3997 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3998 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3999
4000 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4001 l2cap_build_conf_rsp(chan, data,
4002 L2CAP_CONF_SUCCESS, flags), data);
4003}
4004
662d652d
JH		 4005static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4006 u16 scid, u16 dcid)
4007{
4008 struct l2cap_cmd_rej_cid rej;
4009
dcf4adbf 4010 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
662d652d
JH		 4011 rej.scid = __cpu_to_le16(scid);
4012 rej.dcid = __cpu_to_le16(dcid);
4013
4014 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4015}
4016
2d792818
GP		 4017static inline int l2cap_config_req(struct l2cap_conn *conn,
4018 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4019 u8 *data)
1da177e4
LT		 4020{
4021 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4022 u16 dcid, flags;
4023 u8 rsp[64];
48454079 4024 struct l2cap_chan *chan;
3c588192 4025 int len, err = 0;
1da177e4 4026
cb3b3152
JH		 4027 if (cmd_len < sizeof(*req))
4028 return -EPROTO;
4029
1da177e4
LT		 4030 dcid = __le16_to_cpu(req->dcid);
4031 flags = __le16_to_cpu(req->flags);
4032
4033 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4034
baa7e1fa 4035 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4036 if (!chan) {
4037 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4038 return 0;
4039 }
1da177e4 4040
033b1142 4041 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4042 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4043 chan->dcid);
354f60a9 4044 goto unlock;
df6bd743 4045 }
354f60a9 4046
5dee9e7c 4047 /* Reject if config buffer is too small. */
88219a0f 4048 len = cmd_len - sizeof(*req);
cb3b3152 4049 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4050 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4051 l2cap_build_conf_rsp(chan, rsp,
4052 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4053 goto unlock;
4054 }
4055
4056 /* Store config. */
73ffa904
GP		 4057 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4058 chan->conf_len += len;
1da177e4 4059
59e54bd1 4060 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4061 /* Incomplete config. Send empty response. */
4062 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4063 l2cap_build_conf_rsp(chan, rsp,
4064 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4065 goto unlock;
4066 }
4067
4068 /* Complete config. */
73ffa904 4069 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4070 if (len < 0) {
5e4e3972 4071 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4072 goto unlock;
f2fcfcd6 4073 }
1da177e4 4074
1500109b 4075 chan->ident = cmd->ident;
5dee9e7c 4076 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4077 chan->num_conf_rsp++;
5dee9e7c 4078
5dee9e7c 4079 /* Reset config buffer. */
73ffa904 4080 chan->conf_len = 0;
5dee9e7c 4081
c1360a1c 4082 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4083 goto unlock;
4084
c1360a1c 4085 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4086 set_default_fcs(chan);
fcc203c3 4087
105bdf9e
MM		 4088 if (chan->mode == L2CAP_MODE_ERTM ||
4089 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4090 err = l2cap_ertm_init(chan);
4091
4092 if (err < 0)
5e4e3972 4093 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4094 else
4095 l2cap_chan_ready(chan);
0565c1c2 4096
876d9484
MH		 4097 goto unlock;
4098 }
4099
c1360a1c 4100 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4101 u8 buf[64];
1da177e4 4102 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4103 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4104 chan->num_conf_req++;
1da177e4
LT		 4105 }
4106
49c922bb 4107 /* Got Conf Rsp PENDING from remote side and assume we sent
0e8b207e
AE		 4108 Conf Rsp PENDING in the code above */
4109 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4110 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4111
4112 /* check compatibility */
4113
79de886d 4114 /* Send rsp for BR/EDR channel */
f351bc72 4115 if (!chan->hs_hcon)
79de886d
AE		 4116 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4117 else
4118 chan->ident = cmd->ident;
0e8b207e
AE		 4119 }
4120
1da177e4 4121unlock:
6be36555 4122 l2cap_chan_unlock(chan);
3c588192 4123 return err;
1da177e4
LT		 4124}
4125
2d792818 4126static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4127 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4128 u8 *data)
1da177e4
LT		 4129{
4130 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4131 u16 scid, flags, result;
48454079 4132 struct l2cap_chan *chan;
cb3b3152 4133 int len = cmd_len - sizeof(*rsp);
3c588192 4134 int err = 0;
1da177e4 4135
cb3b3152
JH		 4136 if (cmd_len < sizeof(*rsp))
4137 return -EPROTO;
4138
1da177e4
LT		 4139 scid = __le16_to_cpu(rsp->scid);
4140 flags = __le16_to_cpu(rsp->flags);
4141 result = __le16_to_cpu(rsp->result);
4142
61386cba
AE		 4143 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4144 result, len);
1da177e4 4145
baa7e1fa 4146 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4147 if (!chan)
1da177e4
LT		 4148 return 0;
4149
4150 switch (result) {
4151 case L2CAP_CONF_SUCCESS:
47d1ec61 4152 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4153 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4154 break;
4155
0e8b207e
AE		 4156 case L2CAP_CONF_PENDING:
4157 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4158
4159 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4160 char buf[64];
4161
4162 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4163 buf, &result);
0e8b207e 4164 if (len < 0) {
5e4e3972 4165 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4166 goto done;
4167 }
4168
f351bc72 4169 if (!chan->hs_hcon) {
79de886d
AE		 4170 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4171 0);
5ce66b59
AE		 4172 } else {
4173 if (l2cap_check_efs(chan)) {
4174 amp_create_logical_link(chan);
4175 chan->ident = cmd->ident;
4176 }
4177 }
0e8b207e
AE		 4178 }
4179 goto done;
4180
1da177e4 4181 case L2CAP_CONF_UNACCEPT:
73ffa904 4182 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4183 char req[64];
4184
c2c77ec8 4185 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4186 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4187 goto done;
4188 }
4189
f2fcfcd6
GP		 4190 /* throw out any old stored conf requests */
4191 result = L2CAP_CONF_SUCCESS;
b4450035 4192 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4193 req, &result);
f2fcfcd6 4194 if (len < 0) {
5e4e3972 4195 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4196 goto done;
4197 }
4198
4199 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4200 L2CAP_CONF_REQ, len, req);
73ffa904 4201 chan->num_conf_req++;
f2fcfcd6
GP		 4202 if (result != L2CAP_CONF_SUCCESS)
4203 goto done;
4204 break;
1da177e4
LT		 4205 }
4206
8e87d142 4207 default:
6be36555 4208 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4209
ba13ccd9 4210 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4211 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4212 goto done;
4213 }
4214
59e54bd1 4215 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4216 goto done;
4217
c1360a1c 4218 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4219
c1360a1c 4220 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4221 set_default_fcs(chan);
fcc203c3 4222
105bdf9e
MM		 4223 if (chan->mode == L2CAP_MODE_ERTM ||
4224 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4225 err = l2cap_ertm_init(chan);
0565c1c2 4226
3c588192 4227 if (err < 0)
5e4e3972 4228 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4229 else
4230 l2cap_chan_ready(chan);
1da177e4
LT		 4231 }
4232
4233done:
6be36555 4234 l2cap_chan_unlock(chan);
3c588192 4235 return err;
1da177e4
LT		 4236}
4237
2d792818 4238static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4239 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4240 u8 *data)
1da177e4
LT		 4241{
4242 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4243 struct l2cap_disconn_rsp rsp;
4244 u16 dcid, scid;
48454079 4245 struct l2cap_chan *chan;
1da177e4 4246
cb3b3152
JH		 4247 if (cmd_len != sizeof(*req))
4248 return -EPROTO;
4249
1da177e4
LT		 4250 scid = __le16_to_cpu(req->scid);
4251 dcid = __le16_to_cpu(req->dcid);
4252
4253 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4254
3df91ea2
AE		 4255 mutex_lock(&conn->chan_lock);
4256
4257 chan = __l2cap_get_chan_by_scid(conn, dcid);
4258 if (!chan) {
4259 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4260 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4261 return 0;
3df91ea2 4262 }
1da177e4 4263
6be36555
AE		 4264 l2cap_chan_lock(chan);
4265
fe4128e0
GP		 4266 rsp.dcid = cpu_to_le16(chan->scid);
4267 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4268 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4269
5ec1bbe5 4270 chan->ops->set_shutdown(chan);
1da177e4 4271
61d6ef3e 4272 l2cap_chan_hold(chan);
48454079 4273 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4274
4275 l2cap_chan_unlock(chan);
1da177e4 4276
80b98027 4277 chan->ops->close(chan);
61d6ef3e 4278 l2cap_chan_put(chan);
3df91ea2
AE		 4279
4280 mutex_unlock(&conn->chan_lock);
4281
1da177e4
LT		 4282 return 0;
4283}
4284
2d792818 4285static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4286 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4287 u8 *data)
1da177e4
LT		 4288{
4289 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4290 u16 dcid, scid;
48454079 4291 struct l2cap_chan *chan;
1da177e4 4292
cb3b3152
JH		 4293 if (cmd_len != sizeof(*rsp))
4294 return -EPROTO;
4295
1da177e4
LT		 4296 scid = __le16_to_cpu(rsp->scid);
4297 dcid = __le16_to_cpu(rsp->dcid);
4298
4299 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4300
3df91ea2
AE		 4301 mutex_lock(&conn->chan_lock);
4302
4303 chan = __l2cap_get_chan_by_scid(conn, scid);
4304 if (!chan) {
4305 mutex_unlock(&conn->chan_lock);
1da177e4 4306 return 0;
3df91ea2 4307 }
1da177e4 4308
6be36555 4309 l2cap_chan_lock(chan);
48454079 4310
61d6ef3e 4311 l2cap_chan_hold(chan);
48454079 4312 l2cap_chan_del(chan, 0);
6be36555
AE		 4313
4314 l2cap_chan_unlock(chan);
1da177e4 4315
80b98027 4316 chan->ops->close(chan);
61d6ef3e 4317 l2cap_chan_put(chan);
3df91ea2
AE		 4318
4319 mutex_unlock(&conn->chan_lock);
4320
1da177e4
LT		 4321 return 0;
4322}
4323
2d792818 4324static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4325 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4326 u8 *data)
1da177e4
LT		 4327{
4328 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4329 u16 type;
4330
cb3b3152
JH		 4331 if (cmd_len != sizeof(*req))
4332 return -EPROTO;
4333
1da177e4
LT		 4334 type = __le16_to_cpu(req->type);
4335
4336 BT_DBG("type 0x%4.4x", type);
4337
f0709e03
MH		 4338 if (type == L2CAP_IT_FEAT_MASK) {
4339 u8 buf[8];
44dd46de 4340 u32 feat_mask = l2cap_feat_mask;
f0709e03 4341 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
dcf4adbf
JP		 4342 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4343 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4344 if (!disable_ertm)
fcc203c3 4345 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4346 | L2CAP_FEAT_FCS;
0bd49fc7 4347 if (conn->local_fixed_chan & L2CAP_FC_A2MP)
6327eb98 4348 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4349 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4350
1b7bf4ed 4351 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4352 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4353 buf);
e1027a7c
MH		 4354 } else if (type == L2CAP_IT_FIXED_CHAN) {
4355 u8 buf[12];
4356 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4357
dcf4adbf
JP		 4358 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4359 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
0bd49fc7
JH		 4360 rsp->data[0] = conn->local_fixed_chan;
4361 memset(rsp->data + 1, 0, 7);
2d792818
GP		 4362 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4363 buf);
f0709e03
MH		 4364 } else {
4365 struct l2cap_info_rsp rsp;
4366 rsp.type = cpu_to_le16(type);
dcf4adbf 4367 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4368 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4369 &rsp);
f0709e03 4370 }
1da177e4
LT		 4371
4372 return 0;
4373}
4374
2d792818 4375static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4376 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4377 u8 *data)
1da177e4
LT		 4378{
4379 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4380 u16 type, result;
4381
3f6fa3d4 4382 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4383 return -EPROTO;
4384
1da177e4
LT		 4385 type = __le16_to_cpu(rsp->type);
4386 result = __le16_to_cpu(rsp->result);
4387
4388 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4389
e90165be
AE		 4390 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4391 if (cmd->ident != conn->info_ident ||
2d792818 4392 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4393 return 0;
4394
17cd3f37 4395 cancel_delayed_work(&conn->info_timer);
4e8402a3 4396
adb08ede
VT		 4397 if (result != L2CAP_IR_SUCCESS) {
4398 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4399 conn->info_ident = 0;
4400
4401 l2cap_conn_start(conn);
4402
4403 return 0;
4404 }
4405
978c93b9
AE		 4406 switch (type) {
4407 case L2CAP_IT_FEAT_MASK:
83985319 4408 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4409
47ec1dcd 4410 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4411 struct l2cap_info_req req;
dcf4adbf 4412 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4413
4414 conn->info_ident = l2cap_get_ident(conn);
4415
4416 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4417 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4418 } else {
4419 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4420 conn->info_ident = 0;
4421
4422 l2cap_conn_start(conn);
4423 }
978c93b9
AE		 4424 break;
4425
4426 case L2CAP_IT_FIXED_CHAN:
0bd49fc7 4427 conn->remote_fixed_chan = rsp->data[0];
984947dc 4428 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4429 conn->info_ident = 0;
984947dc
MH		 4430
4431 l2cap_conn_start(conn);
978c93b9 4432 break;
984947dc 4433 }
4e8402a3 4434
1da177e4
LT		 4435 return 0;
4436}
4437
1700915f
MM		 4438static int l2cap_create_channel_req(struct l2cap_conn *conn,
4439 struct l2cap_cmd_hdr *cmd,
4440 u16 cmd_len, void *data)
f94ff6ff
MM		 4441{
4442 struct l2cap_create_chan_req *req = data;
6e1df6a6 4443 struct l2cap_create_chan_rsp rsp;
1700915f 4444 struct l2cap_chan *chan;
6e1df6a6 4445 struct hci_dev *hdev;
f94ff6ff
MM		 4446 u16 psm, scid;
4447
4448 if (cmd_len != sizeof(*req))
4449 return -EPROTO;
4450
0bd49fc7 4451 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
f94ff6ff
MM		 4452 return -EINVAL;
4453
4454 psm = le16_to_cpu(req->psm);
4455 scid = le16_to_cpu(req->scid);
4456
ad0ac6ca 4457 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4458
6e1df6a6 4459 /* For controller id 0 make BR/EDR connection */
6ed971ca 4460 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4461 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4462 req->amp_id);
4463 return 0;
4464 }
1700915f 4465
6e1df6a6
AE		 4466 /* Validate AMP controller id */
4467 hdev = hci_dev_get(req->amp_id);
4468 if (!hdev)
4469 goto error;
1700915f 4470
6e1df6a6
AE		 4471 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4472 hci_dev_put(hdev);
4473 goto error;
4474 }
1700915f 4475
6e1df6a6
AE		 4476 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4477 req->amp_id);
4478 if (chan) {
4479 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4480 struct hci_conn *hs_hcon;
1700915f 4481
98e0f7ea
MH		 4482 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4483 &conn->hcon->dst);
6e1df6a6
AE		 4484 if (!hs_hcon) {
4485 hci_dev_put(hdev);
662d652d
JH		 4486 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4487 chan->dcid);
4488 return 0;
1700915f
MM		 4489 }
4490
6e1df6a6
AE		 4491 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4492
6e1df6a6
AE		 4493 mgr->bredr_chan = chan;
4494 chan->hs_hcon = hs_hcon;
fd45bf4c 4495 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4496 conn->mtu = hdev->block_mtu;
1700915f 4497 }
f94ff6ff 4498
6e1df6a6 4499 hci_dev_put(hdev);
f94ff6ff
MM		 4500
4501 return 0;
6e1df6a6
AE		 4502
4503error:
4504 rsp.dcid = 0;
4505 rsp.scid = cpu_to_le16(scid);
dcf4adbf
JP		 4506 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4507 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
6e1df6a6
AE		 4508
4509 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4510 sizeof(rsp), &rsp);
4511
dc280801 4512 return 0;
f94ff6ff
MM		 4513}
4514
8eb200bd
MM		 4515static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4516{
4517 struct l2cap_move_chan_req req;
4518 u8 ident;
4519
4520 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4521
4522 ident = l2cap_get_ident(chan->conn);
4523 chan->ident = ident;
4524
4525 req.icid = cpu_to_le16(chan->scid);
4526 req.dest_amp_id = dest_amp_id;
4527
4528 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4529 &req);
4530
4531 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4532}
4533
1500109b 4534static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4535{
4536 struct l2cap_move_chan_rsp rsp;
4537
1500109b 4538 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4539
1500109b 4540 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4541 rsp.result = cpu_to_le16(result);
4542
1500109b
MM		 4543 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4544 sizeof(rsp), &rsp);
8d5a04a1
MM		 4545}
4546
5b155ef9 4547static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4548{
4549 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4550
5b155ef9 4551 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4552
5b155ef9 4553 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4554
5b155ef9 4555 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4556 cfm.result = cpu_to_le16(result);
4557
5b155ef9
MM		 4558 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4559 sizeof(cfm), &cfm);
4560
4561 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4562}
4563
4564static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4565{
4566 struct l2cap_move_chan_cfm cfm;
4567
4568 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4569
4570 cfm.icid = cpu_to_le16(icid);
dcf4adbf 4571 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
5b155ef9
MM		 4572
4573 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4574 sizeof(cfm), &cfm);
8d5a04a1
MM		 4575}
4576
4577static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4578 u16 icid)
8d5a04a1
MM		 4579{
4580 struct l2cap_move_chan_cfm_rsp rsp;
4581
ad0ac6ca 4582 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4583
4584 rsp.icid = cpu_to_le16(icid);
4585 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4586}
4587
5f3847a4
MM		 4588static void __release_logical_link(struct l2cap_chan *chan)
4589{
4590 chan->hs_hchan = NULL;
4591 chan->hs_hcon = NULL;
4592
4593 /* Placeholder - release the logical link */
4594}
4595
1500109b
MM		 4596static void l2cap_logical_fail(struct l2cap_chan *chan)
4597{
4598 /* Logical link setup failed */
4599 if (chan->state != BT_CONNECTED) {
4600 /* Create channel failure, disconnect */
5e4e3972 4601 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4602 return;
4603 }
4604
4605 switch (chan->move_role) {
4606 case L2CAP_MOVE_ROLE_RESPONDER:
4607 l2cap_move_done(chan);
4608 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4609 break;
4610 case L2CAP_MOVE_ROLE_INITIATOR:
4611 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4612 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4613 /* Remote has only sent pending or
4614 * success responses, clean up
4615 */
4616 l2cap_move_done(chan);
4617 }
4618
4619 /* Other amp move states imply that the move
4620 * has already aborted
4621 */
4622 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4623 break;
4624 }
4625}
4626
4627static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4628 struct hci_chan *hchan)
4629{
4630 struct l2cap_conf_rsp rsp;
1500109b 4631
336178a3 4632 chan->hs_hchan = hchan;
1500109b
MM		 4633 chan->hs_hcon->l2cap_data = chan->conn;
4634
35ba9561 4635 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4636
4637 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4638 int err;
1500109b
MM		 4639
4640 set_default_fcs(chan);
4641
4642 err = l2cap_ertm_init(chan);
4643 if (err < 0)
5e4e3972 4644 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4645 else
4646 l2cap_chan_ready(chan);
4647 }
4648}
4649
4650static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4651 struct hci_chan *hchan)
4652{
4653 chan->hs_hcon = hchan->conn;
4654 chan->hs_hcon->l2cap_data = chan->conn;
4655
4656 BT_DBG("move_state %d", chan->move_state);
4657
4658 switch (chan->move_state) {
4659 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4660 /* Move confirm will be sent after a success
4661 * response is received
4662 */
4663 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4664 break;
4665 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4666 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4667 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4668 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4669 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4670 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4671 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4672 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4673 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4674 }
4675 break;
4676 default:
4677 /* Move was not in expected state, free the channel */
4678 __release_logical_link(chan);
4679
4680 chan->move_state = L2CAP_MOVE_STABLE;
4681 }
4682}
4683
4684/* Call with chan locked */
27695fb4
AE		 4685void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4686 u8 status)
5b155ef9 4687{
1500109b
MM		 4688 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4689
4690 if (status) {
4691 l2cap_logical_fail(chan);
4692 __release_logical_link(chan);
4693 return;
4694 }
4695
4696 if (chan->state != BT_CONNECTED) {
4697 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4698 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4699 l2cap_logical_finish_create(chan, hchan);
4700 } else {
4701 l2cap_logical_finish_move(chan, hchan);
4702 }
5b155ef9
MM		 4703}
4704
3f7a56c4
MM		 4705void l2cap_move_start(struct l2cap_chan *chan)
4706{
4707 BT_DBG("chan %p", chan);
4708
6ed971ca 4709 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4710 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4711 return;
4712 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4713 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4714 /* Placeholder - start physical link setup */
4715 } else {
4716 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4717 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4718 chan->move_id = 0;
4719 l2cap_move_setup(chan);
4720 l2cap_send_move_chan_req(chan, 0);
4721 }
4722}
4723
8eb200bd
MM		 4724static void l2cap_do_create(struct l2cap_chan *chan, int result,
4725 u8 local_amp_id, u8 remote_amp_id)
4726{
62748ca1
AE		 4727 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4728 local_amp_id, remote_amp_id);
4729
12d6cc60
AE		 4730 chan->fcs = L2CAP_FCS_NONE;
4731
62748ca1
AE		 4732 /* Outgoing channel on AMP */
4733 if (chan->state == BT_CONNECT) {
4734 if (result == L2CAP_CR_SUCCESS) {
4735 chan->local_amp_id = local_amp_id;
4736 l2cap_send_create_chan_req(chan, remote_amp_id);
4737 } else {
4738 /* Revert to BR/EDR connect */
4739 l2cap_send_conn_req(chan);
4740 }
4741
4742 return;
4743 }
4744
4745 /* Incoming channel on AMP */
4746 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4747 struct l2cap_conn_rsp rsp;
4748 char buf[128];
4749 rsp.scid = cpu_to_le16(chan->dcid);
4750 rsp.dcid = cpu_to_le16(chan->scid);
4751
8eb200bd
MM		 4752 if (result == L2CAP_CR_SUCCESS) {
4753 /* Send successful response */
dcf4adbf
JP		 4754 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4755 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4756 } else {
4757 /* Send negative response */
dcf4adbf
JP		 4758 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4759 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4760 }
4761
4762 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4763 sizeof(rsp), &rsp);
4764
4765 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4766 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4767 set_bit(CONF_REQ_SENT, &chan->conf_state);
4768 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4769 L2CAP_CONF_REQ,
4770 l2cap_build_conf_req(chan, buf), buf);
4771 chan->num_conf_req++;
4772 }
8eb200bd
MM		 4773 }
4774}
4775
4776static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4777 u8 remote_amp_id)
4778{
4779 l2cap_move_setup(chan);
4780 chan->move_id = local_amp_id;
4781 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4782
4783 l2cap_send_move_chan_req(chan, remote_amp_id);
4784}
4785
4786static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4787{
4788 struct hci_chan *hchan = NULL;
4789
4790 /* Placeholder - get hci_chan for logical link */
4791
4792 if (hchan) {
4793 if (hchan->state == BT_CONNECTED) {
4794 /* Logical link is ready to go */
4795 chan->hs_hcon = hchan->conn;
4796 chan->hs_hcon->l2cap_data = chan->conn;
4797 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4798 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4799
4800 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4801 } else {
4802 /* Wait for logical link to be ready */
4803 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4804 }
4805 } else {
4806 /* Logical link not available */
4807 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4808 }
4809}
4810
4811static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4812{
4813 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4814 u8 rsp_result;
4815 if (result == -EINVAL)
4816 rsp_result = L2CAP_MR_BAD_ID;
4817 else
4818 rsp_result = L2CAP_MR_NOT_ALLOWED;
4819
4820 l2cap_send_move_chan_rsp(chan, rsp_result);
4821 }
4822
4823 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4824 chan->move_state = L2CAP_MOVE_STABLE;
4825
4826 /* Restart data transmission */
4827 l2cap_ertm_send(chan);
4828}
4829
a514b17f
AE		 4830/* Invoke with locked chan */
4831void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4832{
770bfefa 4833 u8 local_amp_id = chan->local_amp_id;
fffadc08 4834 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4835
8eb200bd
MM		 4836 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4837 chan, result, local_amp_id, remote_amp_id);
4838
8eb200bd
MM		 4839 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4840 l2cap_chan_unlock(chan);
4841 return;
4842 }
4843
4844 if (chan->state != BT_CONNECTED) {
4845 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4846 } else if (result != L2CAP_MR_SUCCESS) {
4847 l2cap_do_move_cancel(chan, result);
4848 } else {
4849 switch (chan->move_role) {
4850 case L2CAP_MOVE_ROLE_INITIATOR:
4851 l2cap_do_move_initiate(chan, local_amp_id,
4852 remote_amp_id);
4853 break;
4854 case L2CAP_MOVE_ROLE_RESPONDER:
4855 l2cap_do_move_respond(chan, result);
4856 break;
4857 default:
4858 l2cap_do_move_cancel(chan, result);
4859 break;
4860 }
4861 }
8eb200bd
MM		 4862}
4863
8d5a04a1 4864static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4865 struct l2cap_cmd_hdr *cmd,
4866 u16 cmd_len, void *data)
8d5a04a1
MM		 4867{
4868 struct l2cap_move_chan_req *req = data;
1500109b 4869 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4870 struct l2cap_chan *chan;
8d5a04a1
MM		 4871 u16 icid = 0;
4872 u16 result = L2CAP_MR_NOT_ALLOWED;
4873
4874 if (cmd_len != sizeof(*req))
4875 return -EPROTO;
4876
4877 icid = le16_to_cpu(req->icid);
4878
ad0ac6ca 4879 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4880
0bd49fc7 4881 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
8d5a04a1
MM		 4882 return -EINVAL;
4883
02b0fbb9
MM		 4884 chan = l2cap_get_chan_by_dcid(conn, icid);
4885 if (!chan) {
1500109b 4886 rsp.icid = cpu_to_le16(icid);
dcf4adbf 4887 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
1500109b
MM		 4888 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4889 sizeof(rsp), &rsp);
02b0fbb9
MM		 4890 return 0;
4891 }
4892
1500109b
MM		 4893 chan->ident = cmd->ident;
4894
02b0fbb9
MM		 4895 if (chan->scid < L2CAP_CID_DYN_START ||
4896 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4897 (chan->mode != L2CAP_MODE_ERTM &&
4898 chan->mode != L2CAP_MODE_STREAMING)) {
4899 result = L2CAP_MR_NOT_ALLOWED;
4900 goto send_move_response;
4901 }
4902
4903 if (chan->local_amp_id == req->dest_amp_id) {
4904 result = L2CAP_MR_SAME_ID;
4905 goto send_move_response;
4906 }
4907
6ed971ca 4908 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4909 struct hci_dev *hdev;
4910 hdev = hci_dev_get(req->dest_amp_id);
4911 if (!hdev || hdev->dev_type != HCI_AMP ||
4912 !test_bit(HCI_UP, &hdev->flags)) {
4913 if (hdev)
4914 hci_dev_put(hdev);
4915
4916 result = L2CAP_MR_BAD_ID;
4917 goto send_move_response;
4918 }
4919 hci_dev_put(hdev);
4920 }
4921
4922 /* Detect a move collision. Only send a collision response
4923 * if this side has "lost", otherwise proceed with the move.
4924 * The winner has the larger bd_addr.
4925 */
4926 if ((__chan_is_moving(chan) ||
4927 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4928 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4929 result = L2CAP_MR_COLLISION;
4930 goto send_move_response;
4931 }
4932
02b0fbb9
MM		 4933 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4934 l2cap_move_setup(chan);
4935 chan->move_id = req->dest_amp_id;
4936 icid = chan->dcid;
4937
6ed971ca 4938 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4939 /* Moving to BR/EDR */
4940 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4941 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4942 result = L2CAP_MR_PEND;
4943 } else {
4944 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4945 result = L2CAP_MR_SUCCESS;
4946 }
4947 } else {
4948 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4949 /* Placeholder - uncomment when amp functions are available */
4950 /*amp_accept_physical(chan, req->dest_amp_id);*/
4951 result = L2CAP_MR_PEND;
4952 }
4953
4954send_move_response:
1500109b 4955 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4956
02b0fbb9
MM		 4957 l2cap_chan_unlock(chan);
4958
8d5a04a1
MM		 4959 return 0;
4960}
4961
5b155ef9
MM		 4962static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4963{
4964 struct l2cap_chan *chan;
4965 struct hci_chan *hchan = NULL;
4966
4967 chan = l2cap_get_chan_by_scid(conn, icid);
4968 if (!chan) {
4969 l2cap_send_move_chan_cfm_icid(conn, icid);
4970 return;
4971 }
4972
4973 __clear_chan_timer(chan);
4974 if (result == L2CAP_MR_PEND)
4975 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4976
4977 switch (chan->move_state) {
4978 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4979 /* Move confirm will be sent when logical link
4980 * is complete.
4981 */
4982 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4983 break;
4984 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4985 if (result == L2CAP_MR_PEND) {
4986 break;
4987 } else if (test_bit(CONN_LOCAL_BUSY,
4988 &chan->conn_state)) {
4989 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4990 } else {
4991 /* Logical link is up or moving to BR/EDR,
4992 * proceed with move
4993 */
4994 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4995 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4996 }
4997 break;
4998 case L2CAP_MOVE_WAIT_RSP:
4999 /* Moving to AMP */
5000 if (result == L2CAP_MR_SUCCESS) {
5001 /* Remote is ready, send confirm immediately
5002 * after logical link is ready
5003 */
5004 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5005 } else {
5006 /* Both logical link and move success
5007 * are required to confirm
5008 */
5009 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5010 }
5011
5012 /* Placeholder - get hci_chan for logical link */
5013 if (!hchan) {
5014 /* Logical link not available */
5015 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5016 break;
5017 }
5018
5019 /* If the logical link is not yet connected, do not
5020 * send confirmation.
5021 */
5022 if (hchan->state != BT_CONNECTED)
5023 break;
5024
5025 /* Logical link is already ready to go */
5026
5027 chan->hs_hcon = hchan->conn;
5028 chan->hs_hcon->l2cap_data = chan->conn;
5029
5030 if (result == L2CAP_MR_SUCCESS) {
5031 /* Can confirm now */
5032 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5033 } else {
5034 /* Now only need move success
5035 * to confirm
5036 */
5037 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5038 }
5039
5040 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5041 break;
5042 default:
5043 /* Any other amp move state means the move failed. */
5044 chan->move_id = chan->local_amp_id;
5045 l2cap_move_done(chan);
5046 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5047 }
5048
5049 l2cap_chan_unlock(chan);
5050}
5051
5052static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5053 u16 result)
5054{
5055 struct l2cap_chan *chan;
5056
5057 chan = l2cap_get_chan_by_ident(conn, ident);
5058 if (!chan) {
5059 /* Could not locate channel, icid is best guess */
5060 l2cap_send_move_chan_cfm_icid(conn, icid);
5061 return;
5062 }
5063
5064 __clear_chan_timer(chan);
5065
5066 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5067 if (result == L2CAP_MR_COLLISION) {
5068 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5069 } else {
5070 /* Cleanup - cancel move */
5071 chan->move_id = chan->local_amp_id;
5072 l2cap_move_done(chan);
5073 }
5074 }
5075
5076 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5077
5078 l2cap_chan_unlock(chan);
5079}
5080
5081static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5082 struct l2cap_cmd_hdr *cmd,
5083 u16 cmd_len, void *data)
8d5a04a1
MM		 5084{
5085 struct l2cap_move_chan_rsp *rsp = data;
5086 u16 icid, result;
5087
5088 if (cmd_len != sizeof(*rsp))
5089 return -EPROTO;
5090
5091 icid = le16_to_cpu(rsp->icid);
5092 result = le16_to_cpu(rsp->result);
5093
ad0ac6ca 5094 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5095
5b155ef9
MM		 5096 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5097 l2cap_move_continue(conn, icid, result);
5098 else
5099 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5100
5101 return 0;
5102}
5103
5f3847a4
MM		 5104static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5105 struct l2cap_cmd_hdr *cmd,
5106 u16 cmd_len, void *data)
8d5a04a1
MM		 5107{
5108 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5109 struct l2cap_chan *chan;
8d5a04a1
MM		 5110 u16 icid, result;
5111
5112 if (cmd_len != sizeof(*cfm))
5113 return -EPROTO;
5114
5115 icid = le16_to_cpu(cfm->icid);
5116 result = le16_to_cpu(cfm->result);
5117
ad0ac6ca 5118 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5119
5f3847a4
MM		 5120 chan = l2cap_get_chan_by_dcid(conn, icid);
5121 if (!chan) {
5122 /* Spec requires a response even if the icid was not found */
5123 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5124 return 0;
5125 }
5126
5127 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5128 if (result == L2CAP_MC_CONFIRMED) {
5129 chan->local_amp_id = chan->move_id;
6ed971ca 5130 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5131 __release_logical_link(chan);
5132 } else {
5133 chan->move_id = chan->local_amp_id;
5134 }
5135
5136 l2cap_move_done(chan);
5137 }
5138
8d5a04a1
MM		 5139 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5140
5f3847a4
MM		 5141 l2cap_chan_unlock(chan);
5142
8d5a04a1
MM		 5143 return 0;
5144}
5145
5146static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5147 struct l2cap_cmd_hdr *cmd,
5148 u16 cmd_len, void *data)
8d5a04a1
MM		 5149{
5150 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5151 struct l2cap_chan *chan;
8d5a04a1
MM		 5152 u16 icid;
5153
5154 if (cmd_len != sizeof(*rsp))
5155 return -EPROTO;
5156
5157 icid = le16_to_cpu(rsp->icid);
5158
ad0ac6ca 5159 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5160
3fd71a0a
MM		 5161 chan = l2cap_get_chan_by_scid(conn, icid);
5162 if (!chan)
5163 return 0;
5164
5165 __clear_chan_timer(chan);
5166
5167 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5168 chan->local_amp_id = chan->move_id;
5169
6ed971ca 5170 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5171 __release_logical_link(chan);
5172
5173 l2cap_move_done(chan);
5174 }
5175
5176 l2cap_chan_unlock(chan);
5177
8d5a04a1
MM		 5178 return 0;
5179}
5180
de73115a 5181static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5182 struct l2cap_cmd_hdr *cmd,
203e639e 5183 u16 cmd_len, u8 *data)
de73115a
CT		 5184{
5185 struct hci_conn *hcon = conn->hcon;
5186 struct l2cap_conn_param_update_req *req;
5187 struct l2cap_conn_param_update_rsp rsp;
203e639e 5188 u16 min, max, latency, to_multiplier;
2ce603eb 5189 int err;
de73115a 5190
40bef302 5191 if (hcon->role != HCI_ROLE_MASTER)
de73115a
CT		 5192 return -EINVAL;
5193
de73115a
CT		 5194 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5195 return -EPROTO;
5196
5197 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5198 min = __le16_to_cpu(req->min);
5199 max = __le16_to_cpu(req->max);
de73115a
CT		 5200 latency = __le16_to_cpu(req->latency);
5201 to_multiplier = __le16_to_cpu(req->to_multiplier);
5202
5203 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5204 min, max, latency, to_multiplier);
de73115a
CT		 5205
5206 memset(&rsp, 0, sizeof(rsp));
2ce603eb 5207
d4905f24 5208 err = hci_check_conn_params(min, max, latency, to_multiplier);
2ce603eb 5209 if (err)
dcf4adbf 5210 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5211 else
dcf4adbf 5212 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5213
5214 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5215 sizeof(rsp), &rsp);
de73115a 5216
ffb5a827 5217 if (!err) {
f4869e2a
JH		 5218 u8 store_hint;
5219
5220 store_hint = hci_le_conn_update(hcon, min, max, latency,
5221 to_multiplier);
ffb5a827 5222 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
f4869e2a
JH		 5223 store_hint, min, max, latency,
5224 to_multiplier);
ffb5a827 5225
ffb5a827 5226 }
2ce603eb 5227
de73115a
CT		 5228 return 0;
5229}
5230
f1496dee
JH		 5231static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5232 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5233 u8 *data)
5234{
5235 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
3e64b7bd 5236 struct hci_conn *hcon = conn->hcon;
f1496dee
JH		 5237 u16 dcid, mtu, mps, credits, result;
5238 struct l2cap_chan *chan;
3e64b7bd 5239 int err, sec_level;
f1496dee
JH		 5240
5241 if (cmd_len < sizeof(*rsp))
5242 return -EPROTO;
5243
5244 dcid = __le16_to_cpu(rsp->dcid);
5245 mtu = __le16_to_cpu(rsp->mtu);
5246 mps = __le16_to_cpu(rsp->mps);
5247 credits = __le16_to_cpu(rsp->credits);
5248 result = __le16_to_cpu(rsp->result);
5249
5250 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5251 return -EPROTO;
5252
5253 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5254 dcid, mtu, mps, credits, result);
5255
5256 mutex_lock(&conn->chan_lock);
5257
5258 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5259 if (!chan) {
5260 err = -EBADSLT;
5261 goto unlock;
5262 }
5263
5264 err = 0;
5265
5266 l2cap_chan_lock(chan);
5267
5268 switch (result) {
5269 case L2CAP_CR_SUCCESS:
5270 chan->ident = 0;
5271 chan->dcid = dcid;
5272 chan->omtu = mtu;
5273 chan->remote_mps = mps;
0cd75f7e 5274 chan->tx_credits = credits;
f1496dee
JH		 5275 l2cap_chan_ready(chan);
5276 break;
5277
3e64b7bd
JH		 5278 case L2CAP_CR_AUTHENTICATION:
5279 case L2CAP_CR_ENCRYPTION:
5280 /* If we already have MITM protection we can't do
5281 * anything.
5282 */
5283 if (hcon->sec_level > BT_SECURITY_MEDIUM) {
5284 l2cap_chan_del(chan, ECONNREFUSED);
5285 break;
5286 }
5287
5288 sec_level = hcon->sec_level + 1;
5289 if (chan->sec_level < sec_level)
5290 chan->sec_level = sec_level;
5291
5292 /* We'll need to send a new Connect Request */
5293 clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags);
5294
5295 smp_conn_security(hcon, chan->sec_level);
5296 break;
5297
f1496dee
JH		 5298 default:
5299 l2cap_chan_del(chan, ECONNREFUSED);
5300 break;
5301 }
5302
5303 l2cap_chan_unlock(chan);
5304
5305unlock:
5306 mutex_unlock(&conn->chan_lock);
5307
5308 return err;
5309}
5310
3300d9a9 5311static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5312 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5313 u8 *data)
3300d9a9
CT		 5314{
5315 int err = 0;
5316
5317 switch (cmd->code) {
5318 case L2CAP_COMMAND_REJ:
cb3b3152 5319 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5320 break;
5321
5322 case L2CAP_CONN_REQ:
cb3b3152 5323 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5324 break;
5325
5326 case L2CAP_CONN_RSP:
f5a2598d 5327 case L2CAP_CREATE_CHAN_RSP:
9245e737 5328 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5329 break;
5330
5331 case L2CAP_CONF_REQ:
5332 err = l2cap_config_req(conn, cmd, cmd_len, data);
5333 break;
5334
5335 case L2CAP_CONF_RSP:
9245e737 5336 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5337 break;
5338
5339 case L2CAP_DISCONN_REQ:
cb3b3152 5340 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5341 break;
5342
5343 case L2CAP_DISCONN_RSP:
9245e737 5344 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5345 break;
5346
5347 case L2CAP_ECHO_REQ:
5348 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5349 break;
5350
5351 case L2CAP_ECHO_RSP:
5352 break;
5353
5354 case L2CAP_INFO_REQ:
cb3b3152 5355 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5356 break;
5357
5358 case L2CAP_INFO_RSP:
9245e737 5359 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5360 break;
5361
f94ff6ff
MM		 5362 case L2CAP_CREATE_CHAN_REQ:
5363 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5364 break;
5365
8d5a04a1
MM		 5366 case L2CAP_MOVE_CHAN_REQ:
5367 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5368 break;
5369
5370 case L2CAP_MOVE_CHAN_RSP:
9245e737 5371 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5372 break;
5373
5374 case L2CAP_MOVE_CHAN_CFM:
5375 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5376 break;
5377
5378 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5379 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5380 break;
5381
3300d9a9
CT		 5382 default:
5383 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5384 err = -EINVAL;
5385 break;
5386 }
5387
5388 return err;
5389}
5390
27e2d4c8
JH		 5391static int l2cap_le_connect_req(struct l2cap_conn *conn,
5392 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5393 u8 *data)
5394{
5395 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5396 struct l2cap_le_conn_rsp rsp;
5397 struct l2cap_chan *chan, *pchan;
0cd75f7e 5398 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5399 __le16 psm;
5400 u8 result;
5401
5402 if (cmd_len != sizeof(*req))
5403 return -EPROTO;
5404
5405 scid = __le16_to_cpu(req->scid);
5406 mtu = __le16_to_cpu(req->mtu);
5407 mps = __le16_to_cpu(req->mps);
5408 psm = req->psm;
5409 dcid = 0;
0cd75f7e 5410 credits = 0;
27e2d4c8
JH		 5411
5412 if (mtu < 23 || mps < 23)
5413 return -EPROTO;
5414
5415 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5416 scid, mtu, mps);
5417
5418 /* Check if we have socket listening on psm */
5419 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5420 &conn->hcon->dst, LE_LINK);
5421 if (!pchan) {
5422 result = L2CAP_CR_BAD_PSM;
5423 chan = NULL;
5424 goto response;
5425 }
5426
5427 mutex_lock(&conn->chan_lock);
5428 l2cap_chan_lock(pchan);
5429
35dc6f83
JH		 5430 if (!smp_sufficient_security(conn->hcon, pchan->sec_level,
5431 SMP_ALLOW_STK)) {
27e2d4c8
JH		 5432 result = L2CAP_CR_AUTHENTICATION;
5433 chan = NULL;
5434 goto response_unlock;
5435 }
5436
5437 /* Check if we already have channel with that dcid */
5438 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5439 result = L2CAP_CR_NO_MEM;
5440 chan = NULL;
5441 goto response_unlock;
5442 }
5443
5444 chan = pchan->ops->new_connection(pchan);
5445 if (!chan) {
5446 result = L2CAP_CR_NO_MEM;
5447 goto response_unlock;
5448 }
5449
0ce43ce6
JH		 5450 l2cap_le_flowctl_init(chan);
5451
27e2d4c8
JH		 5452 bacpy(&chan->src, &conn->hcon->src);
5453 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 5454 chan->src_type = bdaddr_src_type(conn->hcon);
5455 chan->dst_type = bdaddr_dst_type(conn->hcon);
27e2d4c8
JH		 5456 chan->psm = psm;
5457 chan->dcid = scid;
5458 chan->omtu = mtu;
5459 chan->remote_mps = mps;
0cd75f7e 5460 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5461
5462 __l2cap_chan_add(conn, chan);
5463 dcid = chan->scid;
0cd75f7e 5464 credits = chan->rx_credits;
27e2d4c8
JH		 5465
5466 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5467
5468 chan->ident = cmd->ident;
5469
5470 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5471 l2cap_state_change(chan, BT_CONNECT2);
434714dc
JH		 5472 /* The following result value is actually not defined
5473 * for LE CoC but we use it to let the function know
5474 * that it should bail out after doing its cleanup
5475 * instead of sending a response.
5476 */
27e2d4c8
JH		 5477 result = L2CAP_CR_PEND;
5478 chan->ops->defer(chan);
5479 } else {
5480 l2cap_chan_ready(chan);
5481 result = L2CAP_CR_SUCCESS;
5482 }
5483
5484response_unlock:
5485 l2cap_chan_unlock(pchan);
5486 mutex_unlock(&conn->chan_lock);
a24cce14 5487 l2cap_chan_put(pchan);
27e2d4c8
JH		 5488
5489 if (result == L2CAP_CR_PEND)
5490 return 0;
5491
5492response:
5493 if (chan) {
5494 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5495 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5496 } else {
5497 rsp.mtu = 0;
5498 rsp.mps = 0;
5499 }
5500
5501 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5502 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5503 rsp.result = cpu_to_le16(result);
5504
5505 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5506
5507 return 0;
5508}
5509
fad5fc89
JH		 5510static inline int l2cap_le_credits(struct l2cap_conn *conn,
5511 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5512 u8 *data)
5513{
5514 struct l2cap_le_credits *pkt;
5515 struct l2cap_chan *chan;
0f1bfe4e 5516 u16 cid, credits, max_credits;
fad5fc89
JH		 5517
5518 if (cmd_len != sizeof(*pkt))
5519 return -EPROTO;
5520
5521 pkt = (struct l2cap_le_credits *) data;
5522 cid = __le16_to_cpu(pkt->cid);
5523 credits = __le16_to_cpu(pkt->credits);
5524
5525 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5526
5527 chan = l2cap_get_chan_by_dcid(conn, cid);
5528 if (!chan)
5529 return -EBADSLT;
5530
0f1bfe4e
JH		 5531 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5532 if (credits > max_credits) {
5533 BT_ERR("LE credits overflow");
5534 l2cap_send_disconn_req(chan, ECONNRESET);
ee93053d 5535 l2cap_chan_unlock(chan);
0f1bfe4e
JH		 5536
5537 /* Return 0 so that we don't trigger an unnecessary
5538 * command reject packet.
5539 */
5540 return 0;
5541 }
5542
fad5fc89
JH		 5543 chan->tx_credits += credits;
5544
5545 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5546 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5547 chan->tx_credits--;
5548 }
5549
5550 if (chan->tx_credits)
5551 chan->ops->resume(chan);
5552
5553 l2cap_chan_unlock(chan);
5554
5555 return 0;
5556}
5557
71fb4197
JH		 5558static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5559 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5560 u8 *data)
5561{
5562 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5563 struct l2cap_chan *chan;
5564
5565 if (cmd_len < sizeof(*rej))
5566 return -EPROTO;
5567
5568 mutex_lock(&conn->chan_lock);
5569
5570 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5571 if (!chan)
5572 goto done;
5573
5574 l2cap_chan_lock(chan);
5575 l2cap_chan_del(chan, ECONNREFUSED);
5576 l2cap_chan_unlock(chan);
5577
5578done:
5579 mutex_unlock(&conn->chan_lock);
5580 return 0;
5581}
5582
3300d9a9 5583static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5584 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5585 u8 *data)
3300d9a9 5586{
b5ecba64
JH		 5587 int err = 0;
5588
3300d9a9
CT		 5589 switch (cmd->code) {
5590 case L2CAP_COMMAND_REJ:
71fb4197 5591 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5592 break;
3300d9a9
CT		 5593
5594 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5595 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5596 break;
3300d9a9
CT		 5597
5598 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5599 break;
3300d9a9 5600
f1496dee
JH		 5601 case L2CAP_LE_CONN_RSP:
5602 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5603 break;
f1496dee 5604
27e2d4c8 5605 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5606 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5607 break;
27e2d4c8 5608
fad5fc89
JH		 5609 case L2CAP_LE_CREDITS:
5610 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5611 break;
5612
3defe01a 5613 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5614 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5615 break;
3defe01a
JH		 5616
5617 case L2CAP_DISCONN_RSP:
5618 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5619 break;
3defe01a 5620
3300d9a9
CT		 5621 default:
5622 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5623 err = -EINVAL;
5624 break;
3300d9a9 5625 }
b5ecba64
JH		 5626
5627 return err;
3300d9a9
CT		 5628}
5629
c5623556
JH		 5630static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5631 struct sk_buff *skb)
5632{
69c4e4e8 5633 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5634 struct l2cap_cmd_hdr *cmd;
5635 u16 len;
c5623556
JH		 5636 int err;
5637
69c4e4e8 5638 if (hcon->type != LE_LINK)
3b166295 5639 goto drop;
69c4e4e8 5640
4f3e219d
MH		 5641 if (skb->len < L2CAP_CMD_HDR_SIZE)
5642 goto drop;
c5623556 5643
4f3e219d
MH		 5644 cmd = (void *) skb->data;
5645 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5646
4f3e219d 5647 len = le16_to_cpu(cmd->len);
c5623556 5648
4f3e219d 5649 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5650
4f3e219d
MH		 5651 if (len != skb->len || !cmd->ident) {
5652 BT_DBG("corrupted command");
5653 goto drop;
5654 }
c5623556 5655
203e639e 5656 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5657 if (err) {
5658 struct l2cap_cmd_rej_unk rej;
c5623556 5659
4f3e219d 5660 BT_ERR("Wrong link type (%d)", err);
c5623556 5661
dcf4adbf 5662 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5663 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5664 sizeof(rej), &rej);
c5623556
JH		 5665 }
5666
3b166295 5667drop:
c5623556
JH		 5668 kfree_skb(skb);
5669}
5670
3300d9a9 5671static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5672 struct sk_buff *skb)
1da177e4 5673{
69c4e4e8 5674 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5675 u8 *data = skb->data;
5676 int len = skb->len;
5677 struct l2cap_cmd_hdr cmd;
3300d9a9 5678 int err;
1da177e4
LT		 5679
5680 l2cap_raw_recv(conn, skb);
5681
69c4e4e8 5682 if (hcon->type != ACL_LINK)
3b166295 5683 goto drop;
69c4e4e8 5684
1da177e4 5685 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5686 u16 cmd_len;
1da177e4
LT		 5687 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5688 data += L2CAP_CMD_HDR_SIZE;
5689 len -= L2CAP_CMD_HDR_SIZE;
5690
88219a0f 5691 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5692
2d792818
GP		 5693 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5694 cmd.ident);
1da177e4 5695
88219a0f 5696 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5697 BT_DBG("corrupted command");
5698 break;
5699 }
5700
c5623556 5701 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5702 if (err) {
e2fd318e 5703 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5704
5705 BT_ERR("Wrong link type (%d)", err);
1da177e4 5706
dcf4adbf 5707 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5708 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5709 sizeof(rej), &rej);
1da177e4
LT		 5710 }
5711
88219a0f
AV		 5712 data += cmd_len;
5713 len -= cmd_len;
1da177e4
LT		 5714 }
5715
3b166295 5716drop:
1da177e4
LT		 5717 kfree_skb(skb);
5718}
5719
47d1ec61 5720static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5721{
5722 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5723 int hdr_size;
5724
5725 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5726 hdr_size = L2CAP_EXT_HDR_SIZE;
5727 else
5728 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5729
47d1ec61 5730 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5731 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5732 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5733 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5734
5735 if (our_fcs != rcv_fcs)
7a560e5c 5736 return -EBADMSG;
fcc203c3
GP		 5737 }
5738 return 0;
5739}
5740
6ea00485 5741static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5742{
e31f7633 5743 struct l2cap_ctrl control;
d5392c8f 5744
e31f7633 5745 BT_DBG("chan %p", chan);
d5392c8f 5746
e31f7633
MM		 5747 memset(&control, 0, sizeof(control));
5748 control.sframe = 1;
5749 control.final = 1;
5750 control.reqseq = chan->buffer_seq;
5751 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5752
e2ab4353 5753 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5754 control.super = L2CAP_SUPER_RNR;
5755 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5756 }
5757
e31f7633
MM		 5758 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5759 chan->unacked_frames > 0)
5760 __set_retrans_timer(chan);
d5392c8f 5761
e31f7633 5762 /* Send pending iframes */
525cd185 5763 l2cap_ertm_send(chan);
d5392c8f 5764
e2ab4353 5765 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5766 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5767 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5768 * send it now.
5769 */
5770 control.super = L2CAP_SUPER_RR;
5771 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5772 }
5773}
5774
2d792818
GP		 5775static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5776 struct sk_buff **last_frag)
18778a63 5777{
84084a31
MM		 5778 /* skb->len reflects data in skb as well as all fragments
5779 * skb->data_len reflects only data in fragments
5780 */
5781 if (!skb_has_frag_list(skb))
5782 skb_shinfo(skb)->frag_list = new_frag;
5783
5784 new_frag->next = NULL;
5785
5786 (*last_frag)->next = new_frag;
5787 *last_frag = new_frag;
5788
5789 skb->len += new_frag->len;
5790 skb->data_len += new_frag->len;
5791 skb->truesize += new_frag->truesize;
5792}
5793
4b51dae9
MM		 5794static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5795 struct l2cap_ctrl *control)
84084a31
MM		 5796{
5797 int err = -EINVAL;
18778a63 5798
4b51dae9 5799 switch (control->sar) {
7e0ef6ee 5800 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5801 if (chan->sdu)
5802 break;
18778a63 5803
80b98027 5804 err = chan->ops->recv(chan, skb);
84084a31 5805 break;
18778a63 5806
7e0ef6ee 5807 case L2CAP_SAR_START:
84084a31
MM		 5808 if (chan->sdu)
5809 break;
18778a63 5810
6f61fd47 5811 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5812 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5813
84084a31
MM		 5814 if (chan->sdu_len > chan->imtu) {
5815 err = -EMSGSIZE;
5816 break;
5817 }
1890d36b 5818
84084a31
MM		 5819 if (skb->len >= chan->sdu_len)
5820 break;
18778a63 5821
84084a31
MM		 5822 chan->sdu = skb;
5823 chan->sdu_last_frag = skb;
18778a63 5824
84084a31
MM		 5825 skb = NULL;
5826 err = 0;
18778a63
GP		 5827 break;
5828
7e0ef6ee 5829 case L2CAP_SAR_CONTINUE:
6f61fd47 5830 if (!chan->sdu)
84084a31 5831 break;
18778a63 5832
84084a31
MM		 5833 append_skb_frag(chan->sdu, skb,
5834 &chan->sdu_last_frag);
5835 skb = NULL;
18778a63 5836
84084a31
MM		 5837 if (chan->sdu->len >= chan->sdu_len)
5838 break;
4178ba46 5839
84084a31 5840 err = 0;
18778a63
GP		 5841 break;
5842
7e0ef6ee 5843 case L2CAP_SAR_END:
6f61fd47 5844 if (!chan->sdu)
84084a31 5845 break;
18778a63 5846
84084a31
MM		 5847 append_skb_frag(chan->sdu, skb,
5848 &chan->sdu_last_frag);
5849 skb = NULL;
4178ba46 5850
84084a31
MM		 5851 if (chan->sdu->len != chan->sdu_len)
5852 break;
18778a63 5853
80b98027 5854 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5855
84084a31
MM		 5856 if (!err) {
5857 /* Reassembly complete */
5858 chan->sdu = NULL;
5859 chan->sdu_last_frag = NULL;
5860 chan->sdu_len = 0;
1890d36b 5861 }
18778a63
GP		 5862 break;
5863 }
5864
84084a31
MM		 5865 if (err) {
5866 kfree_skb(skb);
5867 kfree_skb(chan->sdu);
5868 chan->sdu = NULL;
5869 chan->sdu_last_frag = NULL;
5870 chan->sdu_len = 0;
5871 }
18778a63 5872
84084a31 5873 return err;
18778a63
GP		 5874}
5875
32b32735
MM		 5876static int l2cap_resegment(struct l2cap_chan *chan)
5877{
5878 /* Placeholder */
5879 return 0;
5880}
5881
61aa4f5b 5882void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5883{
61aa4f5b 5884 u8 event;
712132eb 5885
61aa4f5b
MM		 5886 if (chan->mode != L2CAP_MODE_ERTM)
5887 return;
712132eb 5888
61aa4f5b 5889 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5890 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5891}
5892
d2a7ac5d
MM		 5893static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5894{
63838725
MM		 5895 int err = 0;
5896 /* Pass sequential frames to l2cap_reassemble_sdu()
5897 * until a gap is encountered.
5898 */
5899
5900 BT_DBG("chan %p", chan);
5901
5902 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5903 struct sk_buff *skb;
5904 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5905 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5906
5907 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5908
5909 if (!skb)
5910 break;
5911
5912 skb_unlink(skb, &chan->srej_q);
5913 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5914 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5915 if (err)
5916 break;
5917 }
5918
5919 if (skb_queue_empty(&chan->srej_q)) {
5920 chan->rx_state = L2CAP_RX_STATE_RECV;
5921 l2cap_send_ack(chan);
5922 }
5923
5924 return err;
d2a7ac5d
MM		 5925}
5926
5927static void l2cap_handle_srej(struct l2cap_chan *chan,
5928 struct l2cap_ctrl *control)
5929{
f80842a8
MM		 5930 struct sk_buff *skb;
5931
5932 BT_DBG("chan %p, control %p", chan, control);
5933
5934 if (control->reqseq == chan->next_tx_seq) {
5935 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5936 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5937 return;
5938 }
5939
5940 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5941
5942 if (skb == NULL) {
5943 BT_DBG("Seq %d not available for retransmission",
5944 control->reqseq);
5945 return;
5946 }
5947
5948 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5949 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5950 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5951 return;
5952 }
5953
5954 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5955
5956 if (control->poll) {
5957 l2cap_pass_to_tx(chan, control);
5958
5959 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5960 l2cap_retransmit(chan, control);
5961 l2cap_ertm_send(chan);
5962
5963 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5964 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5965 chan->srej_save_reqseq = control->reqseq;
5966 }
5967 } else {
5968 l2cap_pass_to_tx_fbit(chan, control);
5969
5970 if (control->final) {
5971 if (chan->srej_save_reqseq != control->reqseq ||
5972 !test_and_clear_bit(CONN_SREJ_ACT,
5973 &chan->conn_state))
5974 l2cap_retransmit(chan, control);
5975 } else {
5976 l2cap_retransmit(chan, control);
5977 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5978 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5979 chan->srej_save_reqseq = control->reqseq;
5980 }
5981 }
5982 }
d2a7ac5d
MM		 5983}
5984
5985static void l2cap_handle_rej(struct l2cap_chan *chan,
5986 struct l2cap_ctrl *control)
5987{
fcd289df
MM		 5988 struct sk_buff *skb;
5989
5990 BT_DBG("chan %p, control %p", chan, control);
5991
5992 if (control->reqseq == chan->next_tx_seq) {
5993 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5994 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5995 return;
5996 }
5997
5998 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5999
6000 if (chan->max_tx && skb &&
6001 bt_cb(skb)->control.retries >= chan->max_tx) {
6002 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 6003 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6004 return;
6005 }
6006
6007 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6008
6009 l2cap_pass_to_tx(chan, control);
6010
6011 if (control->final) {
6012 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6013 l2cap_retransmit_all(chan, control);
6014 } else {
6015 l2cap_retransmit_all(chan, control);
6016 l2cap_ertm_send(chan);
6017 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6018 set_bit(CONN_REJ_ACT, &chan->conn_state);
6019 }
d2a7ac5d
MM		 6020}
6021
4b51dae9
MM		 6022static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6023{
6024 BT_DBG("chan %p, txseq %d", chan, txseq);
6025
6026 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6027 chan->expected_tx_seq);
6028
6029 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6030 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 6031 chan->tx_win) {
4b51dae9
MM		 6032 /* See notes below regarding "double poll" and
6033 * invalid packets.
6034 */
6035 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6036 BT_DBG("Invalid/Ignore - after SREJ");
6037 return L2CAP_TXSEQ_INVALID_IGNORE;
6038 } else {
6039 BT_DBG("Invalid - in window after SREJ sent");
6040 return L2CAP_TXSEQ_INVALID;
6041 }
6042 }
6043
6044 if (chan->srej_list.head == txseq) {
6045 BT_DBG("Expected SREJ");
6046 return L2CAP_TXSEQ_EXPECTED_SREJ;
6047 }
6048
6049 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6050 BT_DBG("Duplicate SREJ - txseq already stored");
6051 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6052 }
6053
6054 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6055 BT_DBG("Unexpected SREJ - not requested");
6056 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6057 }
6058 }
6059
6060 if (chan->expected_tx_seq == txseq) {
6061 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6062 chan->tx_win) {
6063 BT_DBG("Invalid - txseq outside tx window");
6064 return L2CAP_TXSEQ_INVALID;
6065 } else {
6066 BT_DBG("Expected");
6067 return L2CAP_TXSEQ_EXPECTED;
6068 }
6069 }
6070
6071 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6072 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6073 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6074 return L2CAP_TXSEQ_DUPLICATE;
6075 }
6076
6077 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6078 /* A source of invalid packets is a "double poll" condition,
6079 * where delays cause us to send multiple poll packets. If
6080 * the remote stack receives and processes both polls,
6081 * sequence numbers can wrap around in such a way that a
6082 * resent frame has a sequence number that looks like new data
6083 * with a sequence gap. This would trigger an erroneous SREJ
6084 * request.
6085 *
6086 * Fortunately, this is impossible with a tx window that's
6087 * less than half of the maximum sequence number, which allows
6088 * invalid frames to be safely ignored.
6089 *
6090 * With tx window sizes greater than half of the tx window
6091 * maximum, the frame is invalid and cannot be ignored. This
6092 * causes a disconnect.
6093 */
6094
6095 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6096 BT_DBG("Invalid/Ignore - txseq outside tx window");
6097 return L2CAP_TXSEQ_INVALID_IGNORE;
6098 } else {
6099 BT_DBG("Invalid - txseq outside tx window");
6100 return L2CAP_TXSEQ_INVALID;
6101 }
6102 } else {
6103 BT_DBG("Unexpected - txseq indicates missing frames");
6104 return L2CAP_TXSEQ_UNEXPECTED;
6105 }
6106}
6107
d2a7ac5d
MM		 6108static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6109 struct l2cap_ctrl *control,
6110 struct sk_buff *skb, u8 event)
6111{
6112 int err = 0;
941247f9 6113 bool skb_in_use = false;
d2a7ac5d
MM		 6114
6115 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6116 event);
6117
6118 switch (event) {
6119 case L2CAP_EV_RECV_IFRAME:
6120 switch (l2cap_classify_txseq(chan, control->txseq)) {
6121 case L2CAP_TXSEQ_EXPECTED:
6122 l2cap_pass_to_tx(chan, control);
6123
6124 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6125 BT_DBG("Busy, discarding expected seq %d",
6126 control->txseq);
6127 break;
6128 }
6129
6130 chan->expected_tx_seq = __next_seq(chan,
6131 control->txseq);
6132
6133 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6134 skb_in_use = true;
d2a7ac5d
MM		 6135
6136 err = l2cap_reassemble_sdu(chan, skb, control);
6137 if (err)
6138 break;
6139
6140 if (control->final) {
6141 if (!test_and_clear_bit(CONN_REJ_ACT,
6142 &chan->conn_state)) {
6143 control->final = 0;
6144 l2cap_retransmit_all(chan, control);
6145 l2cap_ertm_send(chan);
6146 }
6147 }
6148
6149 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6150 l2cap_send_ack(chan);
6151 break;
6152 case L2CAP_TXSEQ_UNEXPECTED:
6153 l2cap_pass_to_tx(chan, control);
6154
6155 /* Can't issue SREJ frames in the local busy state.
6156 * Drop this frame, it will be seen as missing
6157 * when local busy is exited.
6158 */
6159 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6160 BT_DBG("Busy, discarding unexpected seq %d",
6161 control->txseq);
6162 break;
6163 }
6164
6165 /* There was a gap in the sequence, so an SREJ
6166 * must be sent for each missing frame. The
6167 * current frame is stored for later use.
6168 */
6169 skb_queue_tail(&chan->srej_q, skb);
941247f9 6170 skb_in_use = true;
d2a7ac5d
MM		 6171 BT_DBG("Queued %p (queue len %d)", skb,
6172 skb_queue_len(&chan->srej_q));
6173
6174 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6175 l2cap_seq_list_clear(&chan->srej_list);
6176 l2cap_send_srej(chan, control->txseq);
6177
6178 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6179 break;
6180 case L2CAP_TXSEQ_DUPLICATE:
6181 l2cap_pass_to_tx(chan, control);
6182 break;
6183 case L2CAP_TXSEQ_INVALID_IGNORE:
6184 break;
6185 case L2CAP_TXSEQ_INVALID:
6186 default:
5e4e3972 6187 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6188 break;
6189 }
6190 break;
6191 case L2CAP_EV_RECV_RR:
6192 l2cap_pass_to_tx(chan, control);
6193 if (control->final) {
6194 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6195
e6a3ee6e
MM		 6196 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6197 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6198 control->final = 0;
6199 l2cap_retransmit_all(chan, control);
6200 }
6201
6202 l2cap_ertm_send(chan);
6203 } else if (control->poll) {
6204 l2cap_send_i_or_rr_or_rnr(chan);
6205 } else {
6206 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6207 &chan->conn_state) &&
6208 chan->unacked_frames)
6209 __set_retrans_timer(chan);
6210
6211 l2cap_ertm_send(chan);
6212 }
6213 break;
6214 case L2CAP_EV_RECV_RNR:
6215 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6216 l2cap_pass_to_tx(chan, control);
6217 if (control && control->poll) {
6218 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6219 l2cap_send_rr_or_rnr(chan, 0);
6220 }
6221 __clear_retrans_timer(chan);
6222 l2cap_seq_list_clear(&chan->retrans_list);
6223 break;
6224 case L2CAP_EV_RECV_REJ:
6225 l2cap_handle_rej(chan, control);
6226 break;
6227 case L2CAP_EV_RECV_SREJ:
6228 l2cap_handle_srej(chan, control);
6229 break;
6230 default:
6231 break;
6232 }
6233
6234 if (skb && !skb_in_use) {
6235 BT_DBG("Freeing %p", skb);
6236 kfree_skb(skb);
6237 }
6238
6239 return err;
6240}
6241
6242static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6243 struct l2cap_ctrl *control,
6244 struct sk_buff *skb, u8 event)
6245{
6246 int err = 0;
6247 u16 txseq = control->txseq;
941247f9 6248 bool skb_in_use = false;
d2a7ac5d
MM		 6249
6250 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6251 event);
6252
6253 switch (event) {
6254 case L2CAP_EV_RECV_IFRAME:
6255 switch (l2cap_classify_txseq(chan, txseq)) {
6256 case L2CAP_TXSEQ_EXPECTED:
6257 /* Keep frame for reassembly later */
6258 l2cap_pass_to_tx(chan, control);
6259 skb_queue_tail(&chan->srej_q, skb);
941247f9 6260 skb_in_use = true;
d2a7ac5d
MM		 6261 BT_DBG("Queued %p (queue len %d)", skb,
6262 skb_queue_len(&chan->srej_q));
6263
6264 chan->expected_tx_seq = __next_seq(chan, txseq);
6265 break;
6266 case L2CAP_TXSEQ_EXPECTED_SREJ:
6267 l2cap_seq_list_pop(&chan->srej_list);
6268
6269 l2cap_pass_to_tx(chan, control);
6270 skb_queue_tail(&chan->srej_q, skb);
941247f9 6271 skb_in_use = true;
d2a7ac5d
MM		 6272 BT_DBG("Queued %p (queue len %d)", skb,
6273 skb_queue_len(&chan->srej_q));
6274
6275 err = l2cap_rx_queued_iframes(chan);
6276 if (err)
6277 break;
6278
6279 break;
6280 case L2CAP_TXSEQ_UNEXPECTED:
6281 /* Got a frame that can't be reassembled yet.
6282 * Save it for later, and send SREJs to cover
6283 * the missing frames.
6284 */
6285 skb_queue_tail(&chan->srej_q, skb);
941247f9 6286 skb_in_use = true;
d2a7ac5d
MM		 6287 BT_DBG("Queued %p (queue len %d)", skb,
6288 skb_queue_len(&chan->srej_q));
6289
6290 l2cap_pass_to_tx(chan, control);
6291 l2cap_send_srej(chan, control->txseq);
6292 break;
6293 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6294 /* This frame was requested with an SREJ, but
6295 * some expected retransmitted frames are
6296 * missing. Request retransmission of missing
6297 * SREJ'd frames.
6298 */
6299 skb_queue_tail(&chan->srej_q, skb);
941247f9 6300 skb_in_use = true;
d2a7ac5d
MM		 6301 BT_DBG("Queued %p (queue len %d)", skb,
6302 skb_queue_len(&chan->srej_q));
6303
6304 l2cap_pass_to_tx(chan, control);
6305 l2cap_send_srej_list(chan, control->txseq);
6306 break;
6307 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6308 /* We've already queued this frame. Drop this copy. */
6309 l2cap_pass_to_tx(chan, control);
6310 break;
6311 case L2CAP_TXSEQ_DUPLICATE:
6312 /* Expecting a later sequence number, so this frame
6313 * was already received. Ignore it completely.
6314 */
6315 break;
6316 case L2CAP_TXSEQ_INVALID_IGNORE:
6317 break;
6318 case L2CAP_TXSEQ_INVALID:
6319 default:
5e4e3972 6320 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6321 break;
6322 }
6323 break;
6324 case L2CAP_EV_RECV_RR:
6325 l2cap_pass_to_tx(chan, control);
6326 if (control->final) {
6327 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6328
6329 if (!test_and_clear_bit(CONN_REJ_ACT,
6330 &chan->conn_state)) {
6331 control->final = 0;
6332 l2cap_retransmit_all(chan, control);
6333 }
6334
6335 l2cap_ertm_send(chan);
6336 } else if (control->poll) {
6337 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6338 &chan->conn_state) &&
6339 chan->unacked_frames) {
6340 __set_retrans_timer(chan);
6341 }
6342
6343 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6344 l2cap_send_srej_tail(chan);
6345 } else {
6346 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6347 &chan->conn_state) &&
6348 chan->unacked_frames)
6349 __set_retrans_timer(chan);
6350
6351 l2cap_send_ack(chan);
6352 }
6353 break;
6354 case L2CAP_EV_RECV_RNR:
6355 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6356 l2cap_pass_to_tx(chan, control);
6357 if (control->poll) {
6358 l2cap_send_srej_tail(chan);
6359 } else {
6360 struct l2cap_ctrl rr_control;
6361 memset(&rr_control, 0, sizeof(rr_control));
6362 rr_control.sframe = 1;
6363 rr_control.super = L2CAP_SUPER_RR;
6364 rr_control.reqseq = chan->buffer_seq;
6365 l2cap_send_sframe(chan, &rr_control);
6366 }
6367
6368 break;
6369 case L2CAP_EV_RECV_REJ:
6370 l2cap_handle_rej(chan, control);
6371 break;
6372 case L2CAP_EV_RECV_SREJ:
6373 l2cap_handle_srej(chan, control);
6374 break;
6375 }
6376
6377 if (skb && !skb_in_use) {
6378 BT_DBG("Freeing %p", skb);
6379 kfree_skb(skb);
6380 }
6381
6382 return err;
6383}
6384
32b32735
MM		 6385static int l2cap_finish_move(struct l2cap_chan *chan)
6386{
6387 BT_DBG("chan %p", chan);
6388
6389 chan->rx_state = L2CAP_RX_STATE_RECV;
6390
6391 if (chan->hs_hcon)
6392 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6393 else
6394 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6395
6396 return l2cap_resegment(chan);
6397}
6398
6399static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6400 struct l2cap_ctrl *control,
6401 struct sk_buff *skb, u8 event)
6402{
6403 int err;
6404
6405 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6406 event);
6407
6408 if (!control->poll)
6409 return -EPROTO;
6410
6411 l2cap_process_reqseq(chan, control->reqseq);
6412
6413 if (!skb_queue_empty(&chan->tx_q))
6414 chan->tx_send_head = skb_peek(&chan->tx_q);
6415 else
6416 chan->tx_send_head = NULL;
6417
6418 /* Rewind next_tx_seq to the point expected
6419 * by the receiver.
6420 */
6421 chan->next_tx_seq = control->reqseq;
6422 chan->unacked_frames = 0;
6423
6424 err = l2cap_finish_move(chan);
6425 if (err)
6426 return err;
6427
6428 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6429 l2cap_send_i_or_rr_or_rnr(chan);
6430
6431 if (event == L2CAP_EV_RECV_IFRAME)
6432 return -EPROTO;
6433
6434 return l2cap_rx_state_recv(chan, control, NULL, event);
6435}
6436
6437static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6438 struct l2cap_ctrl *control,
6439 struct sk_buff *skb, u8 event)
6440{
6441 int err;
6442
6443 if (!control->final)
6444 return -EPROTO;
6445
6446 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6447
6448 chan->rx_state = L2CAP_RX_STATE_RECV;
6449 l2cap_process_reqseq(chan, control->reqseq);
6450
6451 if (!skb_queue_empty(&chan->tx_q))
6452 chan->tx_send_head = skb_peek(&chan->tx_q);
6453 else
6454 chan->tx_send_head = NULL;
6455
6456 /* Rewind next_tx_seq to the point expected
6457 * by the receiver.
6458 */
6459 chan->next_tx_seq = control->reqseq;
6460 chan->unacked_frames = 0;
6461
6462 if (chan->hs_hcon)
6463 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6464 else
6465 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6466
6467 err = l2cap_resegment(chan);
6468
6469 if (!err)
6470 err = l2cap_rx_state_recv(chan, control, skb, event);
6471
6472 return err;
6473}
6474
d2a7ac5d
MM		 6475static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6476{
6477 /* Make sure reqseq is for a packet that has been sent but not acked */
6478 u16 unacked;
6479
6480 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6481 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6482}
6483
cec8ab6e
MM		 6484static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6485 struct sk_buff *skb, u8 event)
218bb9df 6486{
d2a7ac5d
MM		 6487 int err = 0;
6488
6489 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6490 control, skb, event, chan->rx_state);
6491
6492 if (__valid_reqseq(chan, control->reqseq)) {
6493 switch (chan->rx_state) {
6494 case L2CAP_RX_STATE_RECV:
6495 err = l2cap_rx_state_recv(chan, control, skb, event);
6496 break;
6497 case L2CAP_RX_STATE_SREJ_SENT:
6498 err = l2cap_rx_state_srej_sent(chan, control, skb,
6499 event);
6500 break;
32b32735
MM		 6501 case L2CAP_RX_STATE_WAIT_P:
6502 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6503 break;
6504 case L2CAP_RX_STATE_WAIT_F:
6505 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6506 break;
d2a7ac5d
MM		 6507 default:
6508 /* shut it down */
6509 break;
6510 }
6511 } else {
6512 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6513 control->reqseq, chan->next_tx_seq,
6514 chan->expected_ack_seq);
5e4e3972 6515 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6516 }
6517
6518 return err;
cec8ab6e
MM		 6519}
6520
6521static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6522 struct sk_buff *skb)
6523{
4b51dae9
MM		 6524 int err = 0;
6525
6526 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6527 chan->rx_state);
6528
6529 if (l2cap_classify_txseq(chan, control->txseq) ==
6530 L2CAP_TXSEQ_EXPECTED) {
6531 l2cap_pass_to_tx(chan, control);
6532
6533 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6534 __next_seq(chan, chan->buffer_seq));
6535
6536 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6537
6538 l2cap_reassemble_sdu(chan, skb, control);
6539 } else {
6540 if (chan->sdu) {
6541 kfree_skb(chan->sdu);
6542 chan->sdu = NULL;
6543 }
6544 chan->sdu_last_frag = NULL;
6545 chan->sdu_len = 0;
6546
6547 if (skb) {
6548 BT_DBG("Freeing %p", skb);
6549 kfree_skb(skb);
6550 }
6551 }
6552
6553 chan->last_acked_seq = control->txseq;
6554 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6555
6556 return err;
cec8ab6e
MM		 6557}
6558
6559static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6560{
6561 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6562 u16 len;
6563 u8 event;
218bb9df 6564
b76bbd66
MM		 6565 __unpack_control(chan, skb);
6566
218bb9df
GP		 6567 len = skb->len;
6568
6569 /*
6570 * We can just drop the corrupted I-frame here.
6571 * Receiver will miss it and start proper recovery
cec8ab6e 6572 * procedures and ask for retransmission.
218bb9df 6573 */
47d1ec61 6574 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6575 goto drop;
6576
cec8ab6e 6577 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6578 len -= L2CAP_SDULEN_SIZE;
218bb9df 6579
47d1ec61 6580 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6581 len -= L2CAP_FCS_SIZE;
218bb9df 6582
47d1ec61 6583 if (len > chan->mps) {
5e4e3972 6584 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6585 goto drop;
6586 }
6587
cec8ab6e
MM		 6588 if (!control->sframe) {
6589 int err;
218bb9df 6590
cec8ab6e
MM		 6591 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6592 control->sar, control->reqseq, control->final,
6593 control->txseq);
218bb9df 6594
cec8ab6e
MM		 6595 /* Validate F-bit - F=0 always valid, F=1 only
6596 * valid in TX WAIT_F
6597 */
6598 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6599 goto drop;
cec8ab6e
MM		 6600
6601 if (chan->mode != L2CAP_MODE_STREAMING) {
6602 event = L2CAP_EV_RECV_IFRAME;
6603 err = l2cap_rx(chan, control, skb, event);
6604 } else {
6605 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6606 }
6607
cec8ab6e 6608 if (err)
5e4e3972 6609 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6610 } else {
cec8ab6e
MM		 6611 const u8 rx_func_to_event[4] = {
6612 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6613 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6614 };
6615
6616 /* Only I-frames are expected in streaming mode */
6617 if (chan->mode == L2CAP_MODE_STREAMING)
6618 goto drop;
6619
6620 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6621 control->reqseq, control->final, control->poll,
6622 control->super);
6623
218bb9df 6624 if (len != 0) {
1bb166e6 6625 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6626 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6627 goto drop;
6628 }
6629
cec8ab6e
MM		 6630 /* Validate F and P bits */
6631 if (control->final && (control->poll ||
6632 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6633 goto drop;
6634
6635 event = rx_func_to_event[control->super];
6636 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6637 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6638 }
6639
6640 return 0;
6641
6642drop:
6643 kfree_skb(skb);
6644 return 0;
6645}
6646
b1c325c2
JH		 6647static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6648{
6649 struct l2cap_conn *conn = chan->conn;
6650 struct l2cap_le_credits pkt;
6651 u16 return_credits;
6652
6653 /* We return more credits to the sender only after the amount of
6654 * credits falls below half of the initial amount.
6655 */
f15b8ecf 6656 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6657 return;
6658
f15b8ecf 6659 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6660
6661 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6662
6663 chan->rx_credits += return_credits;
6664
6665 pkt.cid = cpu_to_le16(chan->scid);
6666 pkt.credits = cpu_to_le16(return_credits);
6667
6668 chan->ident = l2cap_get_ident(conn);
6669
6670 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6671}
6672
fad5fc89
JH		 6673static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6674{
aac23bf6
JH		 6675 int err;
6676
6677 if (!chan->rx_credits) {
6678 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6679 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6680 return -ENOBUFS;
aac23bf6 6681 }
fad5fc89 6682
aac23bf6
JH		 6683 if (chan->imtu < skb->len) {
6684 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6685 return -ENOBUFS;
aac23bf6 6686 }
fad5fc89
JH		 6687
6688 chan->rx_credits--;
6689 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6690
6691 l2cap_chan_le_send_credits(chan);
6692
aac23bf6
JH		 6693 err = 0;
6694
6695 if (!chan->sdu) {
6696 u16 sdu_len;
6697
6698 sdu_len = get_unaligned_le16(skb->data);
6699 skb_pull(skb, L2CAP_SDULEN_SIZE);
6700
6701 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6702 sdu_len, skb->len, chan->imtu);
6703
6704 if (sdu_len > chan->imtu) {
6705 BT_ERR("Too big LE L2CAP SDU length received");
6706 err = -EMSGSIZE;
6707 goto failed;
6708 }
6709
6710 if (skb->len > sdu_len) {
6711 BT_ERR("Too much LE L2CAP data received");
6712 err = -EINVAL;
6713 goto failed;
6714 }
6715
6716 if (skb->len == sdu_len)
6717 return chan->ops->recv(chan, skb);
6718
6719 chan->sdu = skb;
6720 chan->sdu_len = sdu_len;
6721 chan->sdu_last_frag = skb;
6722
6723 return 0;
6724 }
6725
6726 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6727 chan->sdu->len, skb->len, chan->sdu_len);
6728
6729 if (chan->sdu->len + skb->len > chan->sdu_len) {
6730 BT_ERR("Too much LE L2CAP data received");
6731 err = -EINVAL;
6732 goto failed;
6733 }
6734
6735 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6736 skb = NULL;
6737
6738 if (chan->sdu->len == chan->sdu_len) {
6739 err = chan->ops->recv(chan, chan->sdu);
6740 if (!err) {
6741 chan->sdu = NULL;
6742 chan->sdu_last_frag = NULL;
6743 chan->sdu_len = 0;
6744 }
6745 }
6746
6747failed:
6748 if (err) {
6749 kfree_skb(skb);
6750 kfree_skb(chan->sdu);
6751 chan->sdu = NULL;
6752 chan->sdu_last_frag = NULL;
6753 chan->sdu_len = 0;
6754 }
6755
6756 /* We can't return an error here since we took care of the skb
6757 * freeing internally. An error return would cause the caller to
6758 * do a double-free of the skb.
6759 */
6760 return 0;
fad5fc89
JH		 6761}
6762
13ca56e0
AE		 6763static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6764 struct sk_buff *skb)
1da177e4 6765{
48454079 6766 struct l2cap_chan *chan;
1da177e4 6767
baa7e1fa 6768 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6769 if (!chan) {
97e8e89d
AE		 6770 if (cid == L2CAP_CID_A2MP) {
6771 chan = a2mp_channel_create(conn, skb);
6772 if (!chan) {
6773 kfree_skb(skb);
13ca56e0 6774 return;
97e8e89d
AE		 6775 }
6776
6777 l2cap_chan_lock(chan);
6778 } else {
6779 BT_DBG("unknown cid 0x%4.4x", cid);
6780 /* Drop packet and return */
6781 kfree_skb(skb);
13ca56e0 6782 return;
97e8e89d 6783 }
1da177e4
LT		 6784 }
6785
49208c9c 6786 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6787
89bc500e 6788 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6789 goto drop;
6790
0c1bc5c6 6791 switch (chan->mode) {
38319713 6792 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6793 if (l2cap_le_data_rcv(chan, skb) < 0)
6794 goto drop;
6795
6796 goto done;
6797
1c2acffb
GP		 6798 case L2CAP_MODE_BASIC:
6799 /* If socket recv buffers overflows we drop data here
6800 * which is *bad* because L2CAP has to be reliable.
6801 * But we don't have any other choice. L2CAP doesn't
6802 * provide flow control mechanism. */
1da177e4 6803
2c96e03d
SJ		 6804 if (chan->imtu < skb->len) {
6805 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6806 goto drop;
2c96e03d 6807 }
1da177e4 6808
80b98027 6809 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6810 goto done;
6811 break;
6812
6813 case L2CAP_MODE_ERTM:
6840ed07 6814 case L2CAP_MODE_STREAMING:
cec8ab6e 6815 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6816 goto done;
6817
1c2acffb 6818 default:
0c1bc5c6 6819 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6820 break;
6821 }
1da177e4
LT		 6822
6823drop:
6824 kfree_skb(skb);
6825
6826done:
6be36555 6827 l2cap_chan_unlock(chan);
1da177e4
LT		 6828}
6829
84104b24
AE		 6830static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6831 struct sk_buff *skb)
1da177e4 6832{
ae4fd2d3 6833 struct hci_conn *hcon = conn->hcon;
23691d75 6834 struct l2cap_chan *chan;
1da177e4 6835
ae4fd2d3 6836 if (hcon->type != ACL_LINK)
a24cce14 6837 goto free_skb;
ae4fd2d3 6838
bf20fd4e
JH		 6839 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6840 ACL_LINK);
23691d75 6841 if (!chan)
a24cce14 6842 goto free_skb;
1da177e4 6843
5b4cedaa 6844 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6845
89bc500e 6846 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6847 goto drop;
6848
e13e21dc 6849 if (chan->imtu < skb->len)
1da177e4
LT		 6850 goto drop;
6851
2edf870d 6852 /* Store remote BD_ADDR and PSM for msg_name */
06ae3314 6853 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
2edf870d
MH		 6854 bt_cb(skb)->psm = psm;
6855
a24cce14
JH		 6856 if (!chan->ops->recv(chan, skb)) {
6857 l2cap_chan_put(chan);
84104b24 6858 return;
a24cce14 6859 }
1da177e4
LT		 6860
6861drop:
a24cce14
JH		 6862 l2cap_chan_put(chan);
6863free_skb:
1da177e4 6864 kfree_skb(skb);
1da177e4
LT		 6865}
6866
6867static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6868{
6869 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6870 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6871 u16 cid, len;
6872 __le16 psm;
1da177e4 6873
61a939c6
JH		 6874 if (hcon->state != BT_CONNECTED) {
6875 BT_DBG("queueing pending rx skb");
6876 skb_queue_tail(&conn->pending_rx, skb);
6877 return;
6878 }
6879
1da177e4
LT		 6880 skb_pull(skb, L2CAP_HDR_SIZE);
6881 cid = __le16_to_cpu(lh->cid);
6882 len = __le16_to_cpu(lh->len);
6883
1c2acffb
GP		 6884 if (len != skb->len) {
6885 kfree_skb(skb);
6886 return;
6887 }
6888
9e1d7e15
JH		 6889 /* Since we can't actively block incoming LE connections we must
6890 * at least ensure that we ignore incoming data from them.
6891 */
6892 if (hcon->type == LE_LINK &&
dcc36c16 6893 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
a250e048 6894 bdaddr_dst_type(hcon))) {
e493150e
JH		 6895 kfree_skb(skb);
6896 return;
6897 }
6898
1da177e4
LT		 6899 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6900
6901 switch (cid) {
8db4dc46 6902 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6903 l2cap_sig_channel(conn, skb);
6904 break;
6905
8db4dc46 6906 case L2CAP_CID_CONN_LESS:
097db76c 6907 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6908 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6909 l2cap_conless_channel(conn, psm, skb);
6910 break;
6911
a2877629
MH		 6912 case L2CAP_CID_LE_SIGNALING:
6913 l2cap_le_sig_channel(conn, skb);
6914 break;
6915
1da177e4
LT		 6916 default:
6917 l2cap_data_channel(conn, cid, skb);
6918 break;
6919 }
6920}
6921
61a939c6
JH		 6922static void process_pending_rx(struct work_struct *work)
6923{
6924 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6925 pending_rx_work);
6926 struct sk_buff *skb;
6927
6928 BT_DBG("");
6929
6930 while ((skb = skb_dequeue(&conn->pending_rx)))
6931 l2cap_recv_frame(conn, skb);
6932}
6933
162b49e7
JH		 6934static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6935{
6936 struct l2cap_conn *conn = hcon->l2cap_data;
6937 struct hci_chan *hchan;
6938
6939 if (conn)
6940 return conn;
6941
6942 hchan = hci_chan_create(hcon);
6943 if (!hchan)
6944 return NULL;
6945
27f70f3e 6946 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
162b49e7
JH		 6947 if (!conn) {
6948 hci_chan_del(hchan);
6949 return NULL;
6950 }
6951
6952 kref_init(&conn->ref);
6953 hcon->l2cap_data = conn;
51bb8457 6954 conn->hcon = hci_conn_get(hcon);
162b49e7
JH		 6955 conn->hchan = hchan;
6956
6957 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6958
6959 switch (hcon->type) {
6960 case LE_LINK:
6961 if (hcon->hdev->le_mtu) {
6962 conn->mtu = hcon->hdev->le_mtu;
6963 break;
6964 }
6965 /* fall through */
6966 default:
6967 conn->mtu = hcon->hdev->acl_mtu;
6968 break;
6969 }
6970
6971 conn->feat_mask = 0;
6972
0bd49fc7
JH		 6973 conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS;
6974
6975 if (hcon->type == ACL_LINK &&
6976 test_bit(HCI_HS_ENABLED, &hcon->hdev->dev_flags))
6977 conn->local_fixed_chan |= L2CAP_FC_A2MP;
162b49e7 6978
f9be9e86
MH		 6979 if (test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags) &&
6980 (bredr_sc_enabled(hcon->hdev) ||
300acfde 6981 test_bit(HCI_FORCE_BREDR_SMP, &hcon->hdev->dbg_flags)))
b5ae344d
JH		 6982 conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR;
6983
5a54e7c8 6984 mutex_init(&conn->ident_lock);
162b49e7
JH		 6985 mutex_init(&conn->chan_lock);
6986
6987 INIT_LIST_HEAD(&conn->chan_l);
6988 INIT_LIST_HEAD(&conn->users);
6989
276d8073 6990 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
162b49e7 6991
61a939c6
JH		 6992 skb_queue_head_init(&conn->pending_rx);
6993 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
f3d82d0c 6994 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
61a939c6 6995
162b49e7
JH		 6996 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
6997
6998 return conn;
6999}
7000
7001static bool is_valid_psm(u16 psm, u8 dst_type) {
7002 if (!psm)
7003 return false;
7004
7005 if (bdaddr_type_is_le(dst_type))
7006 return (psm <= 0x00ff);
7007
7008 /* PSM must be odd and lsb of upper byte must be 0 */
7009 return ((psm & 0x0101) == 0x0001);
7010}
7011
7012int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
7013 bdaddr_t *dst, u8 dst_type)
7014{
7015 struct l2cap_conn *conn;
7016 struct hci_conn *hcon;
7017 struct hci_dev *hdev;
162b49e7
JH		 7018 int err;
7019
7020 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7021 dst_type, __le16_to_cpu(psm));
7022
7023 hdev = hci_get_route(dst, &chan->src);
7024 if (!hdev)
7025 return -EHOSTUNREACH;
7026
7027 hci_dev_lock(hdev);
7028
162b49e7
JH		 7029 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7030 chan->chan_type != L2CAP_CHAN_RAW) {
7031 err = -EINVAL;
7032 goto done;
7033 }
7034
21626e62
JH		 7035 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7036 err = -EINVAL;
7037 goto done;
7038 }
7039
7040 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 7041 err = -EINVAL;
7042 goto done;
7043 }
7044
7045 switch (chan->mode) {
7046 case L2CAP_MODE_BASIC:
7047 break;
7048 case L2CAP_MODE_LE_FLOWCTL:
7049 l2cap_le_flowctl_init(chan);
7050 break;
7051 case L2CAP_MODE_ERTM:
7052 case L2CAP_MODE_STREAMING:
7053 if (!disable_ertm)
7054 break;
7055 /* fall through */
7056 default:
beb19e4c 7057 err = -EOPNOTSUPP;
162b49e7
JH		 7058 goto done;
7059 }
7060
7061 switch (chan->state) {
7062 case BT_CONNECT:
7063 case BT_CONNECT2:
7064 case BT_CONFIG:
7065 /* Already connecting */
7066 err = 0;
7067 goto done;
7068
7069 case BT_CONNECTED:
7070 /* Already connected */
7071 err = -EISCONN;
7072 goto done;
7073
7074 case BT_OPEN:
7075 case BT_BOUND:
7076 /* Can connect */
7077 break;
7078
7079 default:
7080 err = -EBADFD;
7081 goto done;
7082 }
7083
7084 /* Set destination address and psm */
7085 bacpy(&chan->dst, dst);
7086 chan->dst_type = dst_type;
7087
7088 chan->psm = psm;
7089 chan->dcid = cid;
7090
6f77d8c7 7091 if (bdaddr_type_is_le(dst_type)) {
e804d25d 7092 u8 role;
cdd6275e 7093
6f77d8c7
AG		 7094 /* Convert from L2CAP channel address type to HCI address type
7095 */
7096 if (dst_type == BDADDR_LE_PUBLIC)
7097 dst_type = ADDR_LE_DEV_PUBLIC;
7098 else
7099 dst_type = ADDR_LE_DEV_RANDOM;
7100
e804d25d
JH		 7101 if (test_bit(HCI_ADVERTISING, &hdev->dev_flags))
7102 role = HCI_ROLE_SLAVE;
7103 else
7104 role = HCI_ROLE_MASTER;
cdd6275e 7105
04a6c589 7106 hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level,
e804d25d 7107 HCI_LE_CONN_TIMEOUT, role);
6f77d8c7 7108 } else {
d93375a8 7109 u8 auth_type = l2cap_get_auth_type(chan);
04a6c589 7110 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7111 }
162b49e7
JH		 7112
7113 if (IS_ERR(hcon)) {
7114 err = PTR_ERR(hcon);
7115 goto done;
7116 }
7117
7118 conn = l2cap_conn_add(hcon);
7119 if (!conn) {
7120 hci_conn_drop(hcon);
7121 err = -ENOMEM;
7122 goto done;
7123 }
7124
02e246ae
JH		 7125 mutex_lock(&conn->chan_lock);
7126 l2cap_chan_lock(chan);
7127
162b49e7
JH		 7128 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7129 hci_conn_drop(hcon);
7130 err = -EBUSY;
02e246ae 7131 goto chan_unlock;
162b49e7
JH		 7132 }
7133
7134 /* Update source addr of the socket */
7135 bacpy(&chan->src, &hcon->src);
a250e048 7136 chan->src_type = bdaddr_src_type(hcon);
162b49e7 7137
02e246ae 7138 __l2cap_chan_add(conn, chan);
162b49e7
JH		 7139
7140 /* l2cap_chan_add takes its own ref so we can drop this one */
7141 hci_conn_drop(hcon);
7142
7143 l2cap_state_change(chan, BT_CONNECT);
7144 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7145
61202e4d
JH		 7146 /* Release chan->sport so that it can be reused by other
7147 * sockets (as it's only used for listening sockets).
7148 */
7149 write_lock(&chan_list_lock);
7150 chan->sport = 0;
7151 write_unlock(&chan_list_lock);
7152
162b49e7
JH		 7153 if (hcon->state == BT_CONNECTED) {
7154 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7155 __clear_chan_timer(chan);
e7cafc45 7156 if (l2cap_chan_check_security(chan, true))
162b49e7
JH		 7157 l2cap_state_change(chan, BT_CONNECTED);
7158 } else
7159 l2cap_do_start(chan);
7160 }
7161
7162 err = 0;
7163
02e246ae 7164chan_unlock:
162b49e7 7165 l2cap_chan_unlock(chan);
02e246ae
JH		 7166 mutex_unlock(&conn->chan_lock);
7167done:
162b49e7
JH		 7168 hci_dev_unlock(hdev);
7169 hci_dev_put(hdev);
7170 return err;
7171}
6b8d4a6a 7172EXPORT_SYMBOL_GPL(l2cap_chan_connect);
162b49e7 7173
1da177e4
LT		 7174/* ---- L2CAP interface with lower layer (HCI) ---- */
7175
686ebf28 7176int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7177{
7178 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7179 struct l2cap_chan *c;
1da177e4 7180
6ed93dc6 7181 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7182
7183 /* Find listening sockets and check their link_mode */
23691d75
GP		 7184 read_lock(&chan_list_lock);
7185 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7186 if (c->state != BT_LISTEN)
1da177e4
LT		 7187 continue;
7188
7eafc59e 7189 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7190 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7191 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7192 lm1 |= HCI_LM_MASTER;
1da177e4 7193 exact++;
7eafc59e 7194 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7195 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7196 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7197 lm2 |= HCI_LM_MASTER;
7198 }
1da177e4 7199 }
23691d75 7200 read_unlock(&chan_list_lock);
1da177e4
LT		 7201
7202 return exact ? lm1 : lm2;
7203}
7204
e760ec12
JH		 7205/* Find the next fixed channel in BT_LISTEN state, continue iteration
7206 * from an existing channel in the list or from the beginning of the
7207 * global list (by passing NULL as first parameter).
7208 */
7209static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
327a7191 7210 struct hci_conn *hcon)
e760ec12 7211{
327a7191
JH		 7212 u8 src_type = bdaddr_src_type(hcon);
7213
e760ec12
JH		 7214 read_lock(&chan_list_lock);
7215
7216 if (c)
7217 c = list_next_entry(c, global_l);
7218 else
7219 c = list_entry(chan_list.next, typeof(*c), global_l);
7220
7221 list_for_each_entry_from(c, &chan_list, global_l) {
7222 if (c->chan_type != L2CAP_CHAN_FIXED)
7223 continue;
7224 if (c->state != BT_LISTEN)
7225 continue;
327a7191 7226 if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY))
54a1b626 7227 continue;
327a7191 7228 if (src_type != c->src_type)
54a1b626 7229 continue;
e760ec12
JH		 7230
7231 l2cap_chan_hold(c);
7232 read_unlock(&chan_list_lock);
7233 return c;
7234 }
7235
7236 read_unlock(&chan_list_lock);
7237
7238 return NULL;
7239}
7240
9e664631 7241void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7242{
e760ec12 7243 struct hci_dev *hdev = hcon->hdev;
0139418c 7244 struct l2cap_conn *conn;
e760ec12
JH		 7245 struct l2cap_chan *pchan;
7246 u8 dst_type;
0139418c 7247
6ed93dc6 7248 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7249
dc0f5088 7250 if (status) {
e175072f 7251 l2cap_conn_del(hcon, bt_to_errno(status));
dc0f5088 7252 return;
ba6fc317 7253 }
dc0f5088
JH		 7254
7255 conn = l2cap_conn_add(hcon);
7256 if (!conn)
7257 return;
7258
a250e048 7259 dst_type = bdaddr_dst_type(hcon);
e760ec12
JH		 7260
7261 /* If device is blocked, do not create channels for it */
7262 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7263 return;
7264
7265 /* Find fixed channels and notify them of the new connection. We
7266 * use multiple individual lookups, continuing each time where
7267 * we left off, because the list lock would prevent calling the
7268 * potentially sleeping l2cap_chan_lock() function.
7269 */
327a7191 7270 pchan = l2cap_global_fixed_chan(NULL, hcon);
e760ec12
JH		 7271 while (pchan) {
7272 struct l2cap_chan *chan, *next;
7273
7274 /* Client fixed channels should override server ones */
7275 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7276 goto next;
7277
7278 l2cap_chan_lock(pchan);
7279 chan = pchan->ops->new_connection(pchan);
7280 if (chan) {
7281 bacpy(&chan->src, &hcon->src);
7282 bacpy(&chan->dst, &hcon->dst);
a250e048 7283 chan->src_type = bdaddr_src_type(hcon);
e760ec12
JH		 7284 chan->dst_type = dst_type;
7285
7286 __l2cap_chan_add(conn, chan);
7287 }
7288
7289 l2cap_chan_unlock(pchan);
7290next:
327a7191 7291 next = l2cap_global_fixed_chan(pchan, hcon);
e760ec12
JH		 7292 l2cap_chan_put(pchan);
7293 pchan = next;
7294 }
7295
dc0f5088 7296 l2cap_conn_ready(conn);
1da177e4
LT		 7297}
7298
686ebf28 7299int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7300{
7301 struct l2cap_conn *conn = hcon->l2cap_data;
7302
7303 BT_DBG("hcon %p", hcon);
7304
686ebf28 7305 if (!conn)
9f5a0d7b 7306 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7307 return conn->disc_reason;
7308}
7309
9e664631 7310void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 7311{
7312 BT_DBG("hcon %p reason %d", hcon, reason);
7313
e175072f 7314 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7315}
7316
4343478f 7317static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7318{
715ec005 7319 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7320 return;
7321
f62e4323 7322 if (encrypt == 0x00) {
4343478f 7323 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7324 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7325 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7326 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7327 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7328 } else {
4343478f 7329 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7330 __clear_chan_timer(chan);
f62e4323
MH		 7331 }
7332}
7333
686ebf28 7334int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7335{
0139418c 7336 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7337 struct l2cap_chan *chan;
1da177e4 7338
0139418c 7339 if (!conn)
1da177e4 7340 return 0;
0139418c 7341
89d8b407 7342 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7343
3df91ea2 7344 mutex_lock(&conn->chan_lock);
1da177e4 7345
3df91ea2 7346 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7347 l2cap_chan_lock(chan);
1da177e4 7348
89d8b407
AE		 7349 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7350 state_to_string(chan->state));
f1cb9af5 7351
2338a7e0 7352 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7353 l2cap_chan_unlock(chan);
7354 continue;
7355 }
7356
191eb398
JH		 7357 if (!status && encrypt)
7358 chan->sec_level = hcon->sec_level;
f1cb9af5 7359
96eff46e 7360 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7361 l2cap_chan_unlock(chan);
6a8d3010
MH		 7362 continue;
7363 }
7364
89bc500e 7365 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7366 chan->state == BT_CONFIG)) {
d97c899b 7367 chan->ops->resume(chan);
4343478f 7368 l2cap_check_encryption(chan, encrypt);
6be36555 7369 l2cap_chan_unlock(chan);
9719f8af
MH		 7370 continue;
7371 }
7372
89bc500e 7373 if (chan->state == BT_CONNECT) {
6d3c15da 7374 if (!status)
93c3e8f5 7375 l2cap_start_connection(chan);
6d3c15da 7376 else
ba13ccd9 7377 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
fa37c1aa
JH		 7378 } else if (chan->state == BT_CONNECT2 &&
7379 chan->mode != L2CAP_MODE_LE_FLOWCTL) {
b1235d79 7380 struct l2cap_conn_rsp rsp;
df3c3931 7381 __u16 res, stat;
1da177e4 7382
b1235d79 7383 if (!status) {
bdc25783 7384 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7385 res = L2CAP_CR_PEND;
7386 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7387 chan->ops->defer(chan);
df3c3931 7388 } else {
acdcabf5 7389 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7390 res = L2CAP_CR_SUCCESS;
7391 stat = L2CAP_CS_NO_INFO;
7392 }
b1235d79 7393 } else {
acdcabf5 7394 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7395 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7396 res = L2CAP_CR_SEC_BLOCK;
7397 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7398 }
7399
fe4128e0
GP		 7400 rsp.scid = cpu_to_le16(chan->dcid);
7401 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7402 rsp.result = cpu_to_le16(res);
7403 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7404 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7405 sizeof(rsp), &rsp);
2d369359
MM		 7406
7407 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7408 res == L2CAP_CR_SUCCESS) {
7409 char buf[128];
7410 set_bit(CONF_REQ_SENT, &chan->conf_state);
7411 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7412 L2CAP_CONF_REQ,
7413 l2cap_build_conf_req(chan, buf),
7414 buf);
7415 chan->num_conf_req++;
7416 }
b1235d79 7417 }
1da177e4 7418
6be36555 7419 l2cap_chan_unlock(chan);
1da177e4
LT		 7420 }
7421
3df91ea2 7422 mutex_unlock(&conn->chan_lock);
b1235d79 7423
1da177e4
LT		 7424 return 0;
7425}
7426
686ebf28 7427int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7428{
7429 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7430 struct l2cap_hdr *hdr;
7431 int len;
1da177e4 7432
1d13a254
AE		 7433 /* For AMP controller do not create l2cap conn */
7434 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7435 goto drop;
1da177e4 7436
5a08ecce 7437 if (!conn)
baf43251 7438 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7439
7440 if (!conn)
1da177e4
LT		 7441 goto drop;
7442
7443 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7444
d73a0988
AE		 7445 switch (flags) {
7446 case ACL_START:
7447 case ACL_START_NO_FLUSH:
7448 case ACL_COMPLETE:
1da177e4
LT		 7449 if (conn->rx_len) {
7450 BT_ERR("Unexpected start frame (len %d)", skb->len);
7451 kfree_skb(conn->rx_skb);
7452 conn->rx_skb = NULL;
7453 conn->rx_len = 0;
7454 l2cap_conn_unreliable(conn, ECOMM);
7455 }
7456
aae7fe22
AE		 7457 /* Start fragment always begin with Basic L2CAP header */
7458 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7459 BT_ERR("Frame is too short (len %d)", skb->len);
7460 l2cap_conn_unreliable(conn, ECOMM);
7461 goto drop;
7462 }
7463
7464 hdr = (struct l2cap_hdr *) skb->data;
7465 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7466
7467 if (len == skb->len) {
7468 /* Complete frame received */
7469 l2cap_recv_frame(conn, skb);
7470 return 0;
7471 }
7472
7473 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7474
7475 if (skb->len > len) {
7476 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7477 skb->len, len);
1da177e4
LT		 7478 l2cap_conn_unreliable(conn, ECOMM);
7479 goto drop;
7480 }
7481
7482 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7483 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7484 if (!conn->rx_skb)
1da177e4
LT		 7485 goto drop;
7486
d626f62b 7487 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7488 skb->len);
1da177e4 7489 conn->rx_len = len - skb->len;
d73a0988
AE		 7490 break;
7491
7492 case ACL_CONT:
1da177e4
LT		 7493 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7494
7495 if (!conn->rx_len) {
7496 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7497 l2cap_conn_unreliable(conn, ECOMM);
7498 goto drop;
7499 }
7500
7501 if (skb->len > conn->rx_len) {
7502 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7503 skb->len, conn->rx_len);
1da177e4
LT		 7504 kfree_skb(conn->rx_skb);
7505 conn->rx_skb = NULL;
7506 conn->rx_len = 0;
7507 l2cap_conn_unreliable(conn, ECOMM);
7508 goto drop;
7509 }
7510
d626f62b 7511 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7512 skb->len);
1da177e4
LT		 7513 conn->rx_len -= skb->len;
7514
7515 if (!conn->rx_len) {
c4e5bafa
JH		 7516 /* Complete frame received. l2cap_recv_frame
7517 * takes ownership of the skb so set the global
7518 * rx_skb pointer to NULL first.
7519 */
7520 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7521 conn->rx_skb = NULL;
c4e5bafa 7522 l2cap_recv_frame(conn, rx_skb);
1da177e4 7523 }
d73a0988 7524 break;
1da177e4
LT		 7525 }
7526
7527drop:
7528 kfree_skb(skb);
7529 return 0;
7530}
7531
aef7d97c 7532static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7533{
23691d75 7534 struct l2cap_chan *c;
1da177e4 7535
333055f2 7536 read_lock(&chan_list_lock);
1da177e4 7537
23691d75 7538 list_for_each_entry(c, &chan_list, global_l) {
eeb5a067
MH		 7539 seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7540 &c->src, c->src_type, &c->dst, c->dst_type,
fcb73338
AE		 7541 c->state, __le16_to_cpu(c->psm),
7542 c->scid, c->dcid, c->imtu, c->omtu,
7543 c->sec_level, c->mode);
61e1b4b7 7544 }
1da177e4 7545
333055f2 7546 read_unlock(&chan_list_lock);
1da177e4 7547
aef7d97c 7548 return 0;
1da177e4
LT		 7549}
7550
aef7d97c
MH		 7551static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7552{
7553 return single_open(file, l2cap_debugfs_show, inode->i_private);
7554}
7555
7556static const struct file_operations l2cap_debugfs_fops = {
7557 .open = l2cap_debugfs_open,
7558 .read = seq_read,
7559 .llseek = seq_lseek,
7560 .release = single_release,
7561};
7562
7563static struct dentry *l2cap_debugfs;
1da177e4 7564
64274518 7565int __init l2cap_init(void)
1da177e4
LT		 7566{
7567 int err;
be9d1227 7568
bb58f747 7569 err = l2cap_init_sockets();
1da177e4
LT		 7570 if (err < 0)
7571 return err;
7572
1120e4bf
MH		 7573 if (IS_ERR_OR_NULL(bt_debugfs))
7574 return 0;
7575
7576 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7577 NULL, &l2cap_debugfs_fops);
1da177e4 7578
40b9397a 7579 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
f15b8ecf 7580 &le_max_credits);
40b9397a 7581 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
f15b8ecf
JH		 7582 &le_default_mps);
7583
1da177e4 7584 return 0;
1da177e4
LT		 7585}
7586
64274518 7587void l2cap_exit(void)
1da177e4 7588{
aef7d97c 7589 debugfs_remove(l2cap_debugfs);
bb58f747 7590 l2cap_cleanup_sockets();
1da177e4
LT		 7591}
7592
d1c4a17d
GP		 7593module_param(disable_ertm, bool, 0644);
7594MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux 6.x block layer and io_uring tree(s)