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nl802154: fix misspelled enum
[deliverable/linux.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
422e925b 7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
1da177e4
LT		 8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
8e87d142
YH		 24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 26 SOFTWARE IS DISCLAIMED.
27*/
28
bb58f747 29/* Bluetooth L2CAP core. */
1da177e4 30
1da177e4
LT		 31#include <linux/module.h>
32
aef7d97c 33#include <linux/debugfs.h>
fcc203c3 34#include <linux/crc16.h>
1da177e4
LT		 35
36#include <net/bluetooth/bluetooth.h>
37#include <net/bluetooth/hci_core.h>
38#include <net/bluetooth/l2cap.h>
7ef9fbf0 39
ac4b7236 40#include "smp.h"
7024728e 41#include "a2mp.h"
7ef9fbf0 42#include "amp.h"
1da177e4 43
0f1bfe4e
JH		 44#define LE_FLOWCTL_MAX_CREDITS 65535
45
d1de6d46 46bool disable_ertm;
f0709e03 47
547d1032 48static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
1da177e4 49
b5ad8b7f
JB		 50static LIST_HEAD(chan_list);
51static DEFINE_RWLOCK(chan_list_lock);
1da177e4 52
f15b8ecf
JH		 53static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
54static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
55
1da177e4 56static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 57 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 58static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 59 void *data);
710f9b0a 60static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 61static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 62
d660366d 63static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 64 struct sk_buff_head *skbs, u8 event);
608bcc6d 65
a250e048 66static inline u8 bdaddr_type(u8 link_type, u8 bdaddr_type)
4f1654e0 67{
a250e048
JH		 68 if (link_type == LE_LINK) {
69 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
4f1654e0
MH		 70 return BDADDR_LE_PUBLIC;
71 else
72 return BDADDR_LE_RANDOM;
73 }
74
75 return BDADDR_BREDR;
76}
77
a250e048
JH		 78static inline u8 bdaddr_src_type(struct hci_conn *hcon)
79{
80 return bdaddr_type(hcon->type, hcon->src_type);
81}
82
83static inline u8 bdaddr_dst_type(struct hci_conn *hcon)
84{
85 return bdaddr_type(hcon->type, hcon->dst_type);
86}
87
0139418c 88/* ---- L2CAP channels ---- */
71ba0e56 89
2d792818
GP		 90static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
91 u16 cid)
0139418c 92{
3df91ea2 93 struct l2cap_chan *c;
3d57dc68 94
3df91ea2
AE		 95 list_for_each_entry(c, &conn->chan_l, list) {
96 if (c->dcid == cid)
97 return c;
0139418c 98 }
3df91ea2 99 return NULL;
0139418c
MH		 100}
101
2d792818
GP		 102static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
103 u16 cid)
0139418c 104{
3df91ea2 105 struct l2cap_chan *c;
3d57dc68 106
3df91ea2
AE		 107 list_for_each_entry(c, &conn->chan_l, list) {
108 if (c->scid == cid)
109 return c;
0139418c 110 }
3df91ea2 111 return NULL;
0139418c
MH		 112}
113
114/* Find channel with given SCID.
ef191ade 115 * Returns locked channel. */
2d792818
GP		 116static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
117 u16 cid)
0139418c 118{
48454079 119 struct l2cap_chan *c;
baa7e1fa 120
3df91ea2 121 mutex_lock(&conn->chan_lock);
baa7e1fa 122 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 123 if (c)
124 l2cap_chan_lock(c);
3df91ea2
AE		 125 mutex_unlock(&conn->chan_lock);
126
48454079 127 return c;
0139418c
MH		 128}
129
b1a130b7
MM		 130/* Find channel with given DCID.
131 * Returns locked channel.
132 */
133static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
134 u16 cid)
135{
136 struct l2cap_chan *c;
137
138 mutex_lock(&conn->chan_lock);
139 c = __l2cap_get_chan_by_dcid(conn, cid);
140 if (c)
141 l2cap_chan_lock(c);
142 mutex_unlock(&conn->chan_lock);
143
144 return c;
145}
146
2d792818
GP		 147static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
148 u8 ident)
0139418c 149{
3df91ea2 150 struct l2cap_chan *c;
3d57dc68 151
3df91ea2
AE		 152 list_for_each_entry(c, &conn->chan_l, list) {
153 if (c->ident == ident)
154 return c;
0139418c 155 }
3df91ea2 156 return NULL;
0139418c
MH		 157}
158
5b155ef9
MM		 159static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
160 u8 ident)
161{
162 struct l2cap_chan *c;
163
164 mutex_lock(&conn->chan_lock);
165 c = __l2cap_get_chan_by_ident(conn, ident);
166 if (c)
167 l2cap_chan_lock(c);
168 mutex_unlock(&conn->chan_lock);
169
170 return c;
171}
172
23691d75 173static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 174{
23691d75 175 struct l2cap_chan *c;
9e4425ff 176
23691d75 177 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 178 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 179 return c;
9e4425ff 180 }
250938cb 181 return NULL;
9e4425ff
GP		 182}
183
184int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
185{
73b2ec18
GP		 186 int err;
187
333055f2 188 write_lock(&chan_list_lock);
9e4425ff 189
23691d75 190 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 191 err = -EADDRINUSE;
192 goto done;
9e4425ff
GP		 193 }
194
73b2ec18
GP		 195 if (psm) {
196 chan->psm = psm;
197 chan->sport = psm;
198 err = 0;
199 } else {
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) {
a4368ff3 295 if (bt_cb(skb)->l2cap.txseq == seq)
608bcc6d
MM		 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),
a4368ff3 957 &bt_cb(skb)->l2cap);
cec8ab6e 958 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 959 } else {
960 __unpack_enhanced_control(get_unaligned_le16(skb->data),
a4368ff3 961 &bt_cb(skb)->l2cap);
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) {
a4368ff3
JH		 1203 if (bt_cb(skb)->l2cap.retries)
1204 bt_cb(skb)->l2cap.retries = 1;
02b0fbb9
MM		 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{
315917e0
JH		 1247 /* The channel may have already been flagged as connected in
1248 * case of receiving data before the L2CAP info req/rsp
1249 * procedure is complete.
1250 */
1251 if (chan->state == BT_CONNECTED)
1252 return;
1253
2827011f 1254 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1255 chan->conf_state = 0;
1256 __clear_chan_timer(chan);
1257
0ce43ce6
JH		 1258 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1259 chan->ops->suspend(chan);
177f8f2b 1260
54a59aa2 1261 chan->state = BT_CONNECTED;
9f0caeb1 1262
fd83e2c2 1263 chan->ops->ready(chan);
9f0caeb1
VCG		 1264}
1265
f1496dee
JH		 1266static void l2cap_le_connect(struct l2cap_chan *chan)
1267{
1268 struct l2cap_conn *conn = chan->conn;
1269 struct l2cap_le_conn_req req;
1270
595177f3
JH		 1271 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1272 return;
1273
f1496dee
JH		 1274 req.psm = chan->psm;
1275 req.scid = cpu_to_le16(chan->scid);
1276 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1277 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1278 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1279
1280 chan->ident = l2cap_get_ident(conn);
1281
1282 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1283 sizeof(req), &req);
1284}
1285
1286static void l2cap_le_start(struct l2cap_chan *chan)
1287{
1288 struct l2cap_conn *conn = chan->conn;
1289
1290 if (!smp_conn_security(conn->hcon, chan->sec_level))
1291 return;
1292
1293 if (!chan->psm) {
1294 l2cap_chan_ready(chan);
1295 return;
1296 }
1297
1298 if (chan->state == BT_CONNECT)
1299 l2cap_le_connect(chan);
1300}
1301
93c3e8f5
AE		 1302static void l2cap_start_connection(struct l2cap_chan *chan)
1303{
1304 if (__amp_capable(chan)) {
1305 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1306 a2mp_discover_amp(chan);
f1496dee
JH		 1307 } else if (chan->conn->hcon->type == LE_LINK) {
1308 l2cap_le_start(chan);
93c3e8f5
AE		 1309 } else {
1310 l2cap_send_conn_req(chan);
1311 }
1312}
1313
aeaeb4bb
JH		 1314static void l2cap_request_info(struct l2cap_conn *conn)
1315{
1316 struct l2cap_info_req req;
1317
1318 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1319 return;
1320
1321 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1322
1323 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1324 conn->info_ident = l2cap_get_ident(conn);
1325
1326 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1327
1328 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1329 sizeof(req), &req);
1330}
1331
fc7f8a7e 1332static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1333{
8c1d787b 1334 struct l2cap_conn *conn = chan->conn;
79d554a6 1335
9f0caeb1 1336 if (conn->hcon->type == LE_LINK) {
96ac34fb 1337 l2cap_le_start(chan);
9f0caeb1
VCG		 1338 return;
1339 }
1340
aeaeb4bb
JH		 1341 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) {
1342 l2cap_request_info(conn);
1343 return;
1344 }
79d554a6 1345
aeaeb4bb
JH		 1346 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1347 return;
79d554a6 1348
aeaeb4bb
JH		 1349 if (l2cap_chan_check_security(chan, true) &&
1350 __l2cap_no_conn_pending(chan))
1351 l2cap_start_connection(chan);
79d554a6
MH		 1352}
1353
cf6c2c0b
GP		 1354static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1355{
1356 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1357 if (!disable_ertm)
cf6c2c0b
GP		 1358 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1359
1360 switch (mode) {
1361 case L2CAP_MODE_ERTM:
1362 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1363 case L2CAP_MODE_STREAMING:
1364 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1365 default:
1366 return 0x00;
1367 }
1368}
1369
5e4e3972 1370static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1371{
5e4e3972 1372 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1373 struct l2cap_disconn_req req;
1374
c13ffa62
GP		 1375 if (!conn)
1376 return;
1377
aad3d0e3 1378 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1379 __clear_retrans_timer(chan);
1380 __clear_monitor_timer(chan);
1381 __clear_ack_timer(chan);
c13ffa62
GP		 1382 }
1383
2338a7e0 1384 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1385 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1386 return;
1387 }
1388
fe4128e0
GP		 1389 req.dcid = cpu_to_le16(chan->dcid);
1390 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1391 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1392 sizeof(req), &req);
c13ffa62 1393
f8e73017 1394 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1395}
1396
1da177e4 1397/* ---- L2CAP connections ---- */
4e8402a3
MH		 1398static void l2cap_conn_start(struct l2cap_conn *conn)
1399{
3df91ea2 1400 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1401
1402 BT_DBG("conn %p", conn);
1403
3df91ea2 1404 mutex_lock(&conn->chan_lock);
4e8402a3 1405
3df91ea2 1406 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1407 l2cap_chan_lock(chan);
4e8402a3 1408
715ec005 1409 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb 1410 l2cap_chan_ready(chan);
6be36555 1411 l2cap_chan_unlock(chan);
79d554a6
MH		 1412 continue;
1413 }
1414
89bc500e 1415 if (chan->state == BT_CONNECT) {
e7cafc45 1416 if (!l2cap_chan_check_security(chan, true) ||
2d792818 1417 !__l2cap_no_conn_pending(chan)) {
6be36555 1418 l2cap_chan_unlock(chan);
47731de7
GP		 1419 continue;
1420 }
79d554a6 1421
c1360a1c 1422 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1423 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1424 &chan->conf_state)) {
89bc500e 1425 l2cap_chan_close(chan, ECONNRESET);
6be36555 1426 l2cap_chan_unlock(chan);
47731de7 1427 continue;
b1235d79 1428 }
47731de7 1429
93c3e8f5 1430 l2cap_start_connection(chan);
47731de7 1431
89bc500e 1432 } else if (chan->state == BT_CONNECT2) {
79d554a6 1433 struct l2cap_conn_rsp rsp;
e9aeb2dd 1434 char buf[128];
fe4128e0
GP		 1435 rsp.scid = cpu_to_le16(chan->dcid);
1436 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1437
e7cafc45 1438 if (l2cap_chan_check_security(chan, false)) {
bdc25783 1439 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
dcf4adbf
JP		 1440 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1441 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1442 chan->ops->defer(chan);
f66dc81f
MH		 1443
1444 } else {
acdcabf5 1445 l2cap_state_change(chan, BT_CONFIG);
dcf4adbf
JP		 1446 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1447 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1448 }
79d554a6 1449 } else {
dcf4adbf
JP		 1450 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1451 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1452 }
1453
fc7f8a7e 1454 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1455 sizeof(rsp), &rsp);
e9aeb2dd 1456
c1360a1c 1457 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1458 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1459 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1460 continue;
1461 }
1462
c1360a1c 1463 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1464 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1465 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1466 chan->num_conf_req++;
4e8402a3
MH		 1467 }
1468
6be36555 1469 l2cap_chan_unlock(chan);
4e8402a3
MH		 1470 }
1471
3df91ea2 1472 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1473}
1474
b62f328b
VT		 1475static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1476{
cc8dba2b 1477 struct hci_conn *hcon = conn->hcon;
dcc36c16 1478 struct hci_dev *hdev = hcon->hdev;
b62f328b 1479
e760ec12 1480 BT_DBG("%s conn %p", hdev->name, conn);
b62f328b 1481
e760ec12
JH		 1482 /* For outgoing pairing which doesn't necessarily have an
1483 * associated socket (e.g. mgmt_pair_device).
1484 */
1485 if (hcon->out)
1486 smp_conn_security(hcon, hcon->pending_sec_level);
cc8dba2b 1487
80afeb6c
MH		 1488 /* For LE slave connections, make sure the connection interval
1489 * is in the range of the minium and maximum interval that has
1490 * been configured for this connection. If not, then trigger
1491 * the connection update procedure.
1492 */
40bef302 1493 if (hcon->role == HCI_ROLE_SLAVE &&
80afeb6c
MH		 1494 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1495 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1496 struct l2cap_conn_param_update_req req;
1497
1498 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1499 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1500 req.latency = cpu_to_le16(hcon->le_conn_latency);
1501 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1502
1503 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1504 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1505 }
b62f328b
VT		 1506}
1507
4e8402a3
MH		 1508static void l2cap_conn_ready(struct l2cap_conn *conn)
1509{
48454079 1510 struct l2cap_chan *chan;
cc110922 1511 struct hci_conn *hcon = conn->hcon;
4e8402a3 1512
79d554a6 1513 BT_DBG("conn %p", conn);
4e8402a3 1514
aeaeb4bb
JH		 1515 if (hcon->type == ACL_LINK)
1516 l2cap_request_info(conn);
1517
e760ec12
JH		 1518 mutex_lock(&conn->chan_lock);
1519
3df91ea2 1520 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1521
6be36555 1522 l2cap_chan_lock(chan);
4e8402a3 1523
2338a7e0 1524 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1525 l2cap_chan_unlock(chan);
1526 continue;
1527 }
1528
cc110922 1529 if (hcon->type == LE_LINK) {
f1496dee 1530 l2cap_le_start(chan);
63128451 1531 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb
JH		 1532 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
1533 l2cap_chan_ready(chan);
1c244f79 1534 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1535 l2cap_do_start(chan);
1c244f79 1536 }
4e8402a3 1537
6be36555 1538 l2cap_chan_unlock(chan);
4e8402a3 1539 }
79d554a6 1540
3df91ea2 1541 mutex_unlock(&conn->chan_lock);
61a939c6 1542
79a05727
JH		 1543 if (hcon->type == LE_LINK)
1544 l2cap_le_conn_ready(conn);
1545
61a939c6 1546 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1547}
1548
1549/* Notify sockets that we cannot guaranty reliability anymore */
1550static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1551{
48454079 1552 struct l2cap_chan *chan;
4e8402a3
MH		 1553
1554 BT_DBG("conn %p", conn);
1555
3df91ea2 1556 mutex_lock(&conn->chan_lock);
4e8402a3 1557
3df91ea2 1558 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1559 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1560 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1561 }
1562
3df91ea2 1563 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1564}
1565
f878fcad 1566static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1567{
f878fcad 1568 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1569 info_timer.work);
4e8402a3 1570
984947dc 1571 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1572 conn->info_ident = 0;
984947dc 1573
4e8402a3
MH		 1574 l2cap_conn_start(conn);
1575}
1576
2c8e1411
DH		 1577/*
1578 * l2cap_user
1579 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1580 * callback is called during registration. The ->remove callback is called
1581 * during unregistration.
1582 * An l2cap_user object can either be explicitly unregistered or when the
1583 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1584 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1585 * External modules must own a reference to the l2cap_conn object if they intend
1586 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1587 * any time if they don't.
1588 */
1589
1590int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1591{
1592 struct hci_dev *hdev = conn->hcon->hdev;
1593 int ret;
1594
1595 /* We need to check whether l2cap_conn is registered. If it is not, we
1596 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1597 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1598 * relies on the parent hci_conn object to be locked. This itself relies
1599 * on the hci_dev object to be locked. So we must lock the hci device
1600 * here, too. */
1601
1602 hci_dev_lock(hdev);
1603
1604 if (user->list.next || user->list.prev) {
1605 ret = -EINVAL;
1606 goto out_unlock;
1607 }
1608
1609 /* conn->hchan is NULL after l2cap_conn_del() was called */
1610 if (!conn->hchan) {
1611 ret = -ENODEV;
1612 goto out_unlock;
1613 }
1614
1615 ret = user->probe(conn, user);
1616 if (ret)
1617 goto out_unlock;
1618
1619 list_add(&user->list, &conn->users);
1620 ret = 0;
1621
1622out_unlock:
1623 hci_dev_unlock(hdev);
1624 return ret;
1625}
1626EXPORT_SYMBOL(l2cap_register_user);
1627
1628void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1629{
1630 struct hci_dev *hdev = conn->hcon->hdev;
1631
1632 hci_dev_lock(hdev);
1633
1634 if (!user->list.next || !user->list.prev)
1635 goto out_unlock;
1636
1637 list_del(&user->list);
1638 user->list.next = NULL;
1639 user->list.prev = NULL;
1640 user->remove(conn, user);
1641
1642out_unlock:
1643 hci_dev_unlock(hdev);
1644}
1645EXPORT_SYMBOL(l2cap_unregister_user);
1646
1647static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1648{
1649 struct l2cap_user *user;
1650
1651 while (!list_empty(&conn->users)) {
1652 user = list_first_entry(&conn->users, struct l2cap_user, list);
1653 list_del(&user->list);
1654 user->list.next = NULL;
1655 user->list.prev = NULL;
1656 user->remove(conn, user);
1657 }
1658}
1659
5d3de7df
VCG		 1660static void l2cap_conn_del(struct hci_conn *hcon, int err)
1661{
1662 struct l2cap_conn *conn = hcon->l2cap_data;
1663 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1664
1665 if (!conn)
1666 return;
1667
1668 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1669
1670 kfree_skb(conn->rx_skb);
1671
61a939c6 1672 skb_queue_purge(&conn->pending_rx);
7ab56c3a
JT		 1673
1674 /* We can not call flush_work(&conn->pending_rx_work) here since we
1675 * might block if we are running on a worker from the same workqueue
1676 * pending_rx_work is waiting on.
1677 */
1678 if (work_pending(&conn->pending_rx_work))
1679 cancel_work_sync(&conn->pending_rx_work);
61a939c6 1680
f3d82d0c
JH		 1681 if (work_pending(&conn->id_addr_update_work))
1682 cancel_work_sync(&conn->id_addr_update_work);
1683
2c8e1411
DH		 1684 l2cap_unregister_all_users(conn);
1685
e31fb860
JH		 1686 /* Force the connection to be immediately dropped */
1687 hcon->disc_timeout = 0;
1688
3df91ea2
AE		 1689 mutex_lock(&conn->chan_lock);
1690
5d3de7df
VCG		 1691 /* Kill channels */
1692 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1693 l2cap_chan_hold(chan);
6be36555
AE		 1694 l2cap_chan_lock(chan);
1695
5d3de7df 1696 l2cap_chan_del(chan, err);
6be36555
AE		 1697
1698 l2cap_chan_unlock(chan);
1699
80b98027 1700 chan->ops->close(chan);
61d6ef3e 1701 l2cap_chan_put(chan);
5d3de7df
VCG		 1702 }
1703
3df91ea2
AE		 1704 mutex_unlock(&conn->chan_lock);
1705
73d80deb
LAD		 1706 hci_chan_del(conn->hchan);
1707
5d3de7df 1708 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1709 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1710
5d3de7df 1711 hcon->l2cap_data = NULL;
9c903e37
DH		 1712 conn->hchan = NULL;
1713 l2cap_conn_put(conn);
5d3de7df
VCG		 1714}
1715
9c903e37
DH		 1716static void l2cap_conn_free(struct kref *ref)
1717{
1718 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1719
1720 hci_conn_put(conn->hcon);
1721 kfree(conn);
1722}
1723
51bb8457 1724struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
9c903e37
DH		 1725{
1726 kref_get(&conn->ref);
51bb8457 1727 return conn;
9c903e37
DH		 1728}
1729EXPORT_SYMBOL(l2cap_conn_get);
1730
1731void l2cap_conn_put(struct l2cap_conn *conn)
1732{
1733 kref_put(&conn->ref, l2cap_conn_free);
1734}
1735EXPORT_SYMBOL(l2cap_conn_put);
1736
1da177e4 1737/* ---- Socket interface ---- */
1da177e4 1738
c2287681 1739/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1740 * Returns closest match.
1741 */
c2287681
IY		 1742static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1743 bdaddr_t *src,
bf20fd4e
JH		 1744 bdaddr_t *dst,
1745 u8 link_type)
1da177e4 1746{
23691d75 1747 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1748
23691d75 1749 read_lock(&chan_list_lock);
e0f0cb56 1750
23691d75 1751 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1752 if (state && c->state != state)
1da177e4
LT		 1753 continue;
1754
bf20fd4e
JH		 1755 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1756 continue;
1757
1758 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1759 continue;
1760
23691d75 1761 if (c->psm == psm) {
c2287681
IY		 1762 int src_match, dst_match;
1763 int src_any, dst_any;
1764
1da177e4 1765 /* Exact match. */
7eafc59e
MH		 1766 src_match = !bacmp(&c->src, src);
1767 dst_match = !bacmp(&c->dst, dst);
c2287681 1768 if (src_match && dst_match) {
a24cce14 1769 l2cap_chan_hold(c);
a7567b20 1770 read_unlock(&chan_list_lock);
23691d75
GP		 1771 return c;
1772 }
1da177e4
LT		 1773
1774 /* Closest match */
7eafc59e
MH		 1775 src_any = !bacmp(&c->src, BDADDR_ANY);
1776 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1777 if ((src_match && dst_any) || (src_any && dst_match) ||
1778 (src_any && dst_any))
23691d75 1779 c1 = c;
1da177e4
LT		 1780 }
1781 }
1da177e4 1782
a24cce14
JH		 1783 if (c1)
1784 l2cap_chan_hold(c1);
1785
23691d75 1786 read_unlock(&chan_list_lock);
e0f0cb56 1787
23691d75 1788 return c1;
1da177e4
LT		 1789}
1790
721c4181 1791static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1792{
721c4181 1793 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1794 monitor_timer.work);
e90bac06 1795
525cd185 1796 BT_DBG("chan %p", chan);
0e98958d 1797
6be36555
AE		 1798 l2cap_chan_lock(chan);
1799
80909e04 1800 if (!chan->conn) {
6be36555 1801 l2cap_chan_unlock(chan);
8d7e1c7f 1802 l2cap_chan_put(chan);
e90bac06
GP		 1803 return;
1804 }
1805
401bb1f7 1806 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1807
6be36555 1808 l2cap_chan_unlock(chan);
8d7e1c7f 1809 l2cap_chan_put(chan);
e90bac06
GP		 1810}
1811
721c4181 1812static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1813{
721c4181 1814 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1815 retrans_timer.work);
e90bac06 1816
49208c9c 1817 BT_DBG("chan %p", chan);
0e98958d 1818
6be36555
AE		 1819 l2cap_chan_lock(chan);
1820
80909e04
MM		 1821 if (!chan->conn) {
1822 l2cap_chan_unlock(chan);
1823 l2cap_chan_put(chan);
1824 return;
1825 }
6be36555 1826
401bb1f7 1827 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1828 l2cap_chan_unlock(chan);
8d7e1c7f 1829 l2cap_chan_put(chan);
e90bac06
GP		 1830}
1831
d660366d
GP		 1832static void l2cap_streaming_send(struct l2cap_chan *chan,
1833 struct sk_buff_head *skbs)
6840ed07 1834{
ccbb84af 1835 struct sk_buff *skb;
3733937d 1836 struct l2cap_ctrl *control;
6840ed07 1837
3733937d
MM		 1838 BT_DBG("chan %p, skbs %p", chan, skbs);
1839
b99e13ad
MM		 1840 if (__chan_is_moving(chan))
1841 return;
1842
3733937d
MM		 1843 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1844
1845 while (!skb_queue_empty(&chan->tx_q)) {
1846
1847 skb = skb_dequeue(&chan->tx_q);
1848
a4368ff3
JH		 1849 bt_cb(skb)->l2cap.retries = 1;
1850 control = &bt_cb(skb)->l2cap;
3733937d
MM		 1851
1852 control->reqseq = 0;
1853 control->txseq = chan->next_tx_seq;
1854
1855 __pack_control(chan, control, skb);
6840ed07 1856
47d1ec61 1857 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1858 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1859 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1860 }
1861
4343478f 1862 l2cap_do_send(chan, skb);
6840ed07 1863
b4400672 1864 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1865
836be934 1866 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1867 chan->frames_sent++;
6840ed07 1868 }
6840ed07
GP		 1869}
1870
67c9e840 1871static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1872{
1873 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1874 struct l2cap_ctrl *control;
1875 int sent = 0;
1876
1877 BT_DBG("chan %p", chan);
1c2acffb 1878
89bc500e 1879 if (chan->state != BT_CONNECTED)
c13ffa62 1880 return -ENOTCONN;
e90bac06 1881
94122bbe
MM		 1882 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1883 return 0;
1884
b99e13ad
MM		 1885 if (__chan_is_moving(chan))
1886 return 0;
1887
18a48e76
MM		 1888 while (chan->tx_send_head &&
1889 chan->unacked_frames < chan->remote_tx_win &&
1890 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1891
18a48e76 1892 skb = chan->tx_send_head;
e90bac06 1893
a4368ff3
JH		 1894 bt_cb(skb)->l2cap.retries = 1;
1895 control = &bt_cb(skb)->l2cap;
95ffa978 1896
e2ab4353 1897 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1898 control->final = 1;
e2ab4353 1899
18a48e76
MM		 1900 control->reqseq = chan->buffer_seq;
1901 chan->last_acked_seq = chan->buffer_seq;
1902 control->txseq = chan->next_tx_seq;
1c2acffb 1903
18a48e76 1904 __pack_control(chan, control, skb);
e90bac06 1905
47d1ec61 1906 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1907 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1908 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1909 }
1910
18a48e76
MM		 1911 /* Clone after data has been modified. Data is assumed to be
1912 read-only (for locking purposes) on cloned sk_buffs.
1913 */
1914 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1915
18a48e76
MM		 1916 if (!tx_skb)
1917 break;
1c2acffb 1918
18a48e76 1919 __set_retrans_timer(chan);
836be934
AE		 1920
1921 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1922 chan->unacked_frames++;
6a026610 1923 chan->frames_sent++;
18a48e76 1924 sent++;
1c2acffb 1925
58d35f87
GP		 1926 if (skb_queue_is_last(&chan->tx_q, skb))
1927 chan->tx_send_head = NULL;
1c2acffb 1928 else
58d35f87 1929 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1930
1931 l2cap_do_send(chan, tx_skb);
b4400672 1932 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1933 }
1934
b4400672
AE		 1935 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1936 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1937
1938 return sent;
9e917af1
GP		 1939}
1940
e1fbd4c1
MM		 1941static void l2cap_ertm_resend(struct l2cap_chan *chan)
1942{
1943 struct l2cap_ctrl control;
1944 struct sk_buff *skb;
1945 struct sk_buff *tx_skb;
1946 u16 seq;
1947
1948 BT_DBG("chan %p", chan);
1949
1950 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1951 return;
1952
b99e13ad
MM		 1953 if (__chan_is_moving(chan))
1954 return;
1955
e1fbd4c1
MM		 1956 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1957 seq = l2cap_seq_list_pop(&chan->retrans_list);
1958
1959 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1960 if (!skb) {
1961 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1962 seq);
e1fbd4c1
MM		 1963 continue;
1964 }
1965
a4368ff3
JH		 1966 bt_cb(skb)->l2cap.retries++;
1967 control = bt_cb(skb)->l2cap;
e1fbd4c1
MM		 1968
1969 if (chan->max_tx != 0 &&
a4368ff3 1970 bt_cb(skb)->l2cap.retries > chan->max_tx) {
e1fbd4c1 1971 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1972 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1973 l2cap_seq_list_clear(&chan->retrans_list);
1974 break;
1975 }
1976
1977 control.reqseq = chan->buffer_seq;
1978 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1979 control.final = 1;
1980 else
1981 control.final = 0;
1982
1983 if (skb_cloned(skb)) {
1984 /* Cloned sk_buffs are read-only, so we need a
1985 * writeable copy
1986 */
8bcde1f2 1987 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1988 } else {
8bcde1f2 1989 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1990 }
1991
1992 if (!tx_skb) {
1993 l2cap_seq_list_clear(&chan->retrans_list);
1994 break;
1995 }
1996
1997 /* Update skb contents */
1998 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1999 put_unaligned_le32(__pack_extended_control(&control),
2000 tx_skb->data + L2CAP_HDR_SIZE);
2001 } else {
2002 put_unaligned_le16(__pack_enhanced_control(&control),
2003 tx_skb->data + L2CAP_HDR_SIZE);
2004 }
2005
13cac152 2006 /* Update FCS */
e1fbd4c1 2007 if (chan->fcs == L2CAP_FCS_CRC16) {
13cac152
LR		 2008 u16 fcs = crc16(0, (u8 *) tx_skb->data,
2009 tx_skb->len - L2CAP_FCS_SIZE);
2010 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
2011 L2CAP_FCS_SIZE);
e1fbd4c1
MM		 2012 }
2013
2014 l2cap_do_send(chan, tx_skb);
2015
2016 BT_DBG("Resent txseq %d", control.txseq);
2017
2018 chan->last_acked_seq = chan->buffer_seq;
2019 }
2020}
2021
f80842a8
MM		 2022static void l2cap_retransmit(struct l2cap_chan *chan,
2023 struct l2cap_ctrl *control)
2024{
2025 BT_DBG("chan %p, control %p", chan, control);
2026
2027 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2028 l2cap_ertm_resend(chan);
2029}
2030
d2a7ac5d
MM		 2031static void l2cap_retransmit_all(struct l2cap_chan *chan,
2032 struct l2cap_ctrl *control)
2033{
e1fbd4c1
MM		 2034 struct sk_buff *skb;
2035
2036 BT_DBG("chan %p, control %p", chan, control);
2037
2038 if (control->poll)
2039 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2040
2041 l2cap_seq_list_clear(&chan->retrans_list);
2042
2043 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2044 return;
2045
2046 if (chan->unacked_frames) {
2047 skb_queue_walk(&chan->tx_q, skb) {
a4368ff3 2048 if (bt_cb(skb)->l2cap.txseq == control->reqseq ||
2d792818 2049 skb == chan->tx_send_head)
e1fbd4c1
MM		 2050 break;
2051 }
2052
2053 skb_queue_walk_from(&chan->tx_q, skb) {
2054 if (skb == chan->tx_send_head)
2055 break;
2056
2057 l2cap_seq_list_append(&chan->retrans_list,
a4368ff3 2058 bt_cb(skb)->l2cap.txseq);
e1fbd4c1
MM		 2059 }
2060
2061 l2cap_ertm_resend(chan);
2062 }
d2a7ac5d
MM		 2063}
2064
0a0aba42 2065static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2066{
0a0aba42
MM		 2067 struct l2cap_ctrl control;
2068 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2069 chan->last_acked_seq);
2070 int threshold;
9e917af1 2071
0a0aba42
MM		 2072 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2073 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2074
0a0aba42
MM		 2075 memset(&control, 0, sizeof(control));
2076 control.sframe = 1;
dfc909be 2077
0a0aba42
MM		 2078 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2079 chan->rx_state == L2CAP_RX_STATE_RECV) {
2080 __clear_ack_timer(chan);
2081 control.super = L2CAP_SUPER_RNR;
2082 control.reqseq = chan->buffer_seq;
2083 l2cap_send_sframe(chan, &control);
2084 } else {
2085 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2086 l2cap_ertm_send(chan);
2087 /* If any i-frames were sent, they included an ack */
2088 if (chan->buffer_seq == chan->last_acked_seq)
2089 frames_to_ack = 0;
2090 }
dfc909be 2091
c20f8e35 2092 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2093 * Calculate without mul or div
2094 */
c20f8e35 2095 threshold = chan->ack_win;
0a0aba42
MM		 2096 threshold += threshold << 1;
2097 threshold >>= 2;
2098
b4400672 2099 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2100 threshold);
2101
2102 if (frames_to_ack >= threshold) {
2103 __clear_ack_timer(chan);
2104 control.super = L2CAP_SUPER_RR;
2105 control.reqseq = chan->buffer_seq;
2106 l2cap_send_sframe(chan, &control);
2107 frames_to_ack = 0;
2108 }
1c2acffb 2109
0a0aba42
MM		 2110 if (frames_to_ack)
2111 __set_ack_timer(chan);
2112 }
b17e73bb
SJ		 2113}
2114
04124681
GP		 2115static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2116 struct msghdr *msg, int len,
2117 int count, struct sk_buff *skb)
1c2acffb 2118{
0952a57a 2119 struct l2cap_conn *conn = chan->conn;
1c2acffb 2120 struct sk_buff **frag;
90338947 2121 int sent = 0;
1da177e4 2122
17836394 2123 if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count)
1c2acffb 2124 return -EFAULT;
1da177e4
LT		 2125
2126 sent += count;
2127 len -= count;
2128
2129 /* Continuation fragments (no L2CAP header) */
2130 frag = &skb_shinfo(skb)->frag_list;
2131 while (len) {
fbe00700
GP		 2132 struct sk_buff *tmp;
2133
1da177e4
LT		 2134 count = min_t(unsigned int, conn->mtu, len);
2135
d9fbd02b 2136 tmp = chan->ops->alloc_skb(chan, 0, count,
fbe00700
GP		 2137 msg->msg_flags & MSG_DONTWAIT);
2138 if (IS_ERR(tmp))
2139 return PTR_ERR(tmp);
2140
2141 *frag = tmp;
2f7719ce 2142
17836394
AV		 2143 if (copy_from_iter(skb_put(*frag, count), count,
2144 &msg->msg_iter) != count)
1c2acffb 2145 return -EFAULT;
1da177e4
LT		 2146
2147 sent += count;
2148 len -= count;
2149
2d0ed3d5
GP		 2150 skb->len += (*frag)->len;
2151 skb->data_len += (*frag)->len;
2152
1da177e4
LT		 2153 frag = &(*frag)->next;
2154 }
1da177e4
LT		 2155
2156 return sent;
1c2acffb 2157}
1da177e4 2158
5e59b791 2159static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
8d46321c 2160 struct msghdr *msg, size_t len)
1c2acffb 2161{
8c1d787b 2162 struct l2cap_conn *conn = chan->conn;
1c2acffb 2163 struct sk_buff *skb;
03a51213 2164 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2165 struct l2cap_hdr *lh;
2166
8d46321c
MH		 2167 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2168 __le16_to_cpu(chan->psm), len);
1c2acffb
GP		 2169
2170 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2171
d9fbd02b 2172 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2173 msg->msg_flags & MSG_DONTWAIT);
2174 if (IS_ERR(skb))
2175 return skb;
1c2acffb
GP		 2176
2177 /* Create L2CAP header */
2178 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2179 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2180 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2181 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2182
0952a57a 2183 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2184 if (unlikely(err < 0)) {
2185 kfree_skb(skb);
2186 return ERR_PTR(err);
2187 }
2188 return skb;
2189}
2190
5e59b791 2191static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
8d46321c 2192 struct msghdr *msg, size_t len)
1c2acffb 2193{
8c1d787b 2194 struct l2cap_conn *conn = chan->conn;
1c2acffb 2195 struct sk_buff *skb;
f2ba7fae 2196 int err, count;
1c2acffb
GP		 2197 struct l2cap_hdr *lh;
2198
b4400672 2199 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2200
f2ba7fae 2201 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2202
d9fbd02b 2203 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
90338947
GP		 2204 msg->msg_flags & MSG_DONTWAIT);
2205 if (IS_ERR(skb))
2206 return skb;
1c2acffb
GP		 2207
2208 /* Create L2CAP header */
2209 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2210 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2211 lh->len = cpu_to_le16(len);
1c2acffb 2212
0952a57a 2213 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2214 if (unlikely(err < 0)) {
2215 kfree_skb(skb);
2216 return ERR_PTR(err);
2217 }
2218 return skb;
2219}
2220
ab0ff76d 2221static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2222 struct msghdr *msg, size_t len,
2223 u16 sdulen)
1c2acffb 2224{
8c1d787b 2225 struct l2cap_conn *conn = chan->conn;
1c2acffb 2226 struct sk_buff *skb;
e4ca6d98 2227 int err, count, hlen;
1c2acffb
GP		 2228 struct l2cap_hdr *lh;
2229
b4400672 2230 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2231
0ee0d208
GP		 2232 if (!conn)
2233 return ERR_PTR(-ENOTCONN);
2234
ba7aa64f 2235 hlen = __ertm_hdr_size(chan);
e4ca6d98 2236
c74e560c 2237 if (sdulen)
03a51213 2238 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2239
47d1ec61 2240 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2241 hlen += L2CAP_FCS_SIZE;
fcc203c3 2242
1c2acffb 2243 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2244
d9fbd02b 2245 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2246 msg->msg_flags & MSG_DONTWAIT);
2247 if (IS_ERR(skb))
2248 return skb;
1c2acffb
GP		 2249
2250 /* Create L2CAP header */
2251 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2252 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2253 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2254
18a48e76
MM		 2255 /* Control header is populated later */
2256 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2257 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2258 else
2259 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2260
c74e560c 2261 if (sdulen)
03a51213 2262 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2263
0952a57a 2264 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2265 if (unlikely(err < 0)) {
2266 kfree_skb(skb);
2267 return ERR_PTR(err);
2268 }
e90bac06 2269
a4368ff3
JH		 2270 bt_cb(skb)->l2cap.fcs = chan->fcs;
2271 bt_cb(skb)->l2cap.retries = 0;
1c2acffb 2272 return skb;
1da177e4
LT		 2273}
2274
94122bbe
MM		 2275static int l2cap_segment_sdu(struct l2cap_chan *chan,
2276 struct sk_buff_head *seg_queue,
2277 struct msghdr *msg, size_t len)
c74e560c 2278{
c74e560c 2279 struct sk_buff *skb;
94122bbe
MM		 2280 u16 sdu_len;
2281 size_t pdu_len;
94122bbe 2282 u8 sar;
c74e560c 2283
b4400672 2284 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2285
94122bbe
MM		 2286 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2287 * so fragmented skbs are not used. The HCI layer's handling
2288 * of fragmented skbs is not compatible with ERTM's queueing.
2289 */
c74e560c 2290
94122bbe
MM		 2291 /* PDU size is derived from the HCI MTU */
2292 pdu_len = chan->conn->mtu;
c74e560c 2293
a549574d
MM		 2294 /* Constrain PDU size for BR/EDR connections */
2295 if (!chan->hs_hcon)
2296 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2297
2298 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2299 if (chan->fcs)
2300 pdu_len -= L2CAP_FCS_SIZE;
2301
ba7aa64f 2302 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2303
2304 /* Remote device may have requested smaller PDUs */
2305 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2306
2307 if (len <= pdu_len) {
2308 sar = L2CAP_SAR_UNSEGMENTED;
2309 sdu_len = 0;
2310 pdu_len = len;
2311 } else {
2312 sar = L2CAP_SAR_START;
2313 sdu_len = len;
94122bbe
MM		 2314 }
2315
2316 while (len > 0) {
2317 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2318
c74e560c 2319 if (IS_ERR(skb)) {
94122bbe 2320 __skb_queue_purge(seg_queue);
c74e560c
GP		 2321 return PTR_ERR(skb);
2322 }
2323
a4368ff3 2324 bt_cb(skb)->l2cap.sar = sar;
94122bbe
MM		 2325 __skb_queue_tail(seg_queue, skb);
2326
2327 len -= pdu_len;
069cb270 2328 if (sdu_len)
94122bbe 2329 sdu_len = 0;
94122bbe
MM		 2330
2331 if (len <= pdu_len) {
2332 sar = L2CAP_SAR_END;
2333 pdu_len = len;
2334 } else {
2335 sar = L2CAP_SAR_CONTINUE;
2336 }
c74e560c 2337 }
c74e560c 2338
f0f62799 2339 return 0;
c74e560c
GP		 2340}
2341
177f8f2b
JH		 2342static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2343 struct msghdr *msg,
2344 size_t len, u16 sdulen)
2345{
2346 struct l2cap_conn *conn = chan->conn;
2347 struct sk_buff *skb;
2348 int err, count, hlen;
2349 struct l2cap_hdr *lh;
2350
2351 BT_DBG("chan %p len %zu", chan, len);
2352
2353 if (!conn)
2354 return ERR_PTR(-ENOTCONN);
2355
2356 hlen = L2CAP_HDR_SIZE;
2357
2358 if (sdulen)
2359 hlen += L2CAP_SDULEN_SIZE;
2360
2361 count = min_t(unsigned int, (conn->mtu - hlen), len);
2362
d9fbd02b 2363 skb = chan->ops->alloc_skb(chan, hlen, count,
177f8f2b
JH		 2364 msg->msg_flags & MSG_DONTWAIT);
2365 if (IS_ERR(skb))
2366 return skb;
2367
2368 /* Create L2CAP header */
2369 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2370 lh->cid = cpu_to_le16(chan->dcid);
2371 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2372
2373 if (sdulen)
2374 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2375
2376 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2377 if (unlikely(err < 0)) {
2378 kfree_skb(skb);
2379 return ERR_PTR(err);
2380 }
2381
2382 return skb;
2383}
2384
2385static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2386 struct sk_buff_head *seg_queue,
2387 struct msghdr *msg, size_t len)
2388{
2389 struct sk_buff *skb;
2390 size_t pdu_len;
2391 u16 sdu_len;
2392
2393 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2394
177f8f2b 2395 sdu_len = len;
72c6fb91 2396 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
177f8f2b
JH		 2397
2398 while (len > 0) {
2399 if (len <= pdu_len)
2400 pdu_len = len;
2401
2402 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2403 if (IS_ERR(skb)) {
2404 __skb_queue_purge(seg_queue);
2405 return PTR_ERR(skb);
2406 }
2407
2408 __skb_queue_tail(seg_queue, skb);
2409
2410 len -= pdu_len;
2411
2412 if (sdu_len) {
2413 sdu_len = 0;
2414 pdu_len += L2CAP_SDULEN_SIZE;
2415 }
2416 }
2417
2418 return 0;
2419}
2420
8d46321c 2421int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
9a91a04a 2422{
9a91a04a 2423 struct sk_buff *skb;
9a91a04a 2424 int err;
94122bbe 2425 struct sk_buff_head seg_queue;
9a91a04a 2426
31e8ce80
SWK		 2427 if (!chan->conn)
2428 return -ENOTCONN;
2429
9a91a04a 2430 /* Connectionless channel */
715ec005 2431 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
8d46321c 2432 skb = l2cap_create_connless_pdu(chan, msg, len);
9a91a04a
GP		 2433 if (IS_ERR(skb))
2434 return PTR_ERR(skb);
2435
ede81a2a
AK		 2436 /* Channel lock is released before requesting new skb and then
2437 * reacquired thus we need to recheck channel state.
2438 */
2439 if (chan->state != BT_CONNECTED) {
2440 kfree_skb(skb);
2441 return -ENOTCONN;
2442 }
2443
9a91a04a
GP		 2444 l2cap_do_send(chan, skb);
2445 return len;
2446 }
2447
2448 switch (chan->mode) {
38319713 2449 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2450 /* Check outgoing MTU */
2451 if (len > chan->omtu)
2452 return -EMSGSIZE;
2453
fad5fc89
JH		 2454 if (!chan->tx_credits)
2455 return -EAGAIN;
2456
177f8f2b
JH		 2457 __skb_queue_head_init(&seg_queue);
2458
2459 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2460
2461 if (chan->state != BT_CONNECTED) {
2462 __skb_queue_purge(&seg_queue);
2463 err = -ENOTCONN;
2464 }
2465
2466 if (err)
2467 return err;
2468
2469 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2470
2471 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2472 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2473 chan->tx_credits--;
2474 }
2475
2476 if (!chan->tx_credits)
2477 chan->ops->suspend(chan);
2478
2479 err = len;
2480
2481 break;
2482
fad5fc89 2483 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2484 /* Check outgoing MTU */
2485 if (len > chan->omtu)
2486 return -EMSGSIZE;
2487
2488 /* Create a basic PDU */
8d46321c 2489 skb = l2cap_create_basic_pdu(chan, msg, len);
9a91a04a
GP		 2490 if (IS_ERR(skb))
2491 return PTR_ERR(skb);
2492
ede81a2a
AK		 2493 /* Channel lock is released before requesting new skb and then
2494 * reacquired thus we need to recheck channel state.
2495 */
2496 if (chan->state != BT_CONNECTED) {
2497 kfree_skb(skb);
2498 return -ENOTCONN;
2499 }
2500
9a91a04a
GP		 2501 l2cap_do_send(chan, skb);
2502 err = len;
2503 break;
2504
2505 case L2CAP_MODE_ERTM:
2506 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2507 /* Check outgoing MTU */
2508 if (len > chan->omtu) {
2509 err = -EMSGSIZE;
2510 break;
2511 }
9a91a04a 2512
94122bbe 2513 __skb_queue_head_init(&seg_queue);
9a91a04a 2514
94122bbe
MM		 2515 /* Do segmentation before calling in to the state machine,
2516 * since it's possible to block while waiting for memory
2517 * allocation.
2518 */
2519 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2520
94122bbe
MM		 2521 /* The channel could have been closed while segmenting,
2522 * check that it is still connected.
2523 */
2524 if (chan->state != BT_CONNECTED) {
2525 __skb_queue_purge(&seg_queue);
2526 err = -ENOTCONN;
9a91a04a
GP		 2527 }
2528
94122bbe 2529 if (err)
9a91a04a 2530 break;
9a91a04a 2531
3733937d 2532 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2533 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2534 else
d660366d 2535 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2536
d660366d 2537 err = len;
9a91a04a 2538
94122bbe
MM		 2539 /* If the skbs were not queued for sending, they'll still be in
2540 * seg_queue and need to be purged.
2541 */
2542 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2543 break;
2544
2545 default:
2546 BT_DBG("bad state %1.1x", chan->mode);
2547 err = -EBADFD;
2548 }
2549
2550 return err;
2551}
6b8d4a6a 2552EXPORT_SYMBOL_GPL(l2cap_chan_send);
9a91a04a 2553
d2a7ac5d
MM		 2554static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2555{
bed68bde
MM		 2556 struct l2cap_ctrl control;
2557 u16 seq;
2558
b4400672 2559 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2560
2561 memset(&control, 0, sizeof(control));
2562 control.sframe = 1;
2563 control.super = L2CAP_SUPER_SREJ;
2564
2565 for (seq = chan->expected_tx_seq; seq != txseq;
2566 seq = __next_seq(chan, seq)) {
2567 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2568 control.reqseq = seq;
2569 l2cap_send_sframe(chan, &control);
2570 l2cap_seq_list_append(&chan->srej_list, seq);
2571 }
2572 }
2573
2574 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2575}
2576
2577static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2578{
bed68bde
MM		 2579 struct l2cap_ctrl control;
2580
2581 BT_DBG("chan %p", chan);
2582
2583 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2584 return;
2585
2586 memset(&control, 0, sizeof(control));
2587 control.sframe = 1;
2588 control.super = L2CAP_SUPER_SREJ;
2589 control.reqseq = chan->srej_list.tail;
2590 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2591}
2592
2593static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2594{
bed68bde
MM		 2595 struct l2cap_ctrl control;
2596 u16 initial_head;
2597 u16 seq;
2598
b4400672 2599 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2600
2601 memset(&control, 0, sizeof(control));
2602 control.sframe = 1;
2603 control.super = L2CAP_SUPER_SREJ;
2604
2605 /* Capture initial list head to allow only one pass through the list. */
2606 initial_head = chan->srej_list.head;
2607
2608 do {
2609 seq = l2cap_seq_list_pop(&chan->srej_list);
2610 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2611 break;
2612
2613 control.reqseq = seq;
2614 l2cap_send_sframe(chan, &control);
2615 l2cap_seq_list_append(&chan->srej_list, seq);
2616 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2617}
2618
608bcc6d
MM		 2619static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2620{
2621 struct sk_buff *acked_skb;
2622 u16 ackseq;
2623
b4400672 2624 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2625
2626 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2627 return;
2628
b4400672 2629 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2630 chan->expected_ack_seq, chan->unacked_frames);
2631
2632 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2633 ackseq = __next_seq(chan, ackseq)) {
2634
2635 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2636 if (acked_skb) {
2637 skb_unlink(acked_skb, &chan->tx_q);
2638 kfree_skb(acked_skb);
2639 chan->unacked_frames--;
2640 }
2641 }
2642
2643 chan->expected_ack_seq = reqseq;
2644
2645 if (chan->unacked_frames == 0)
2646 __clear_retrans_timer(chan);
2647
b4400672 2648 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2649}
2650
2651static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2652{
2653 BT_DBG("chan %p", chan);
2654
2655 chan->expected_tx_seq = chan->buffer_seq;
2656 l2cap_seq_list_clear(&chan->srej_list);
2657 skb_queue_purge(&chan->srej_q);
2658 chan->rx_state = L2CAP_RX_STATE_RECV;
2659}
2660
d660366d
GP		 2661static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2662 struct l2cap_ctrl *control,
2663 struct sk_buff_head *skbs, u8 event)
608bcc6d 2664{
608bcc6d
MM		 2665 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2666 event);
2667
2668 switch (event) {
2669 case L2CAP_EV_DATA_REQUEST:
2670 if (chan->tx_send_head == NULL)
2671 chan->tx_send_head = skb_peek(skbs);
2672
2673 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2674 l2cap_ertm_send(chan);
2675 break;
2676 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2677 BT_DBG("Enter LOCAL_BUSY");
2678 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2679
2680 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2681 /* The SREJ_SENT state must be aborted if we are to
2682 * enter the LOCAL_BUSY state.
2683 */
2684 l2cap_abort_rx_srej_sent(chan);
2685 }
2686
2687 l2cap_send_ack(chan);
2688
2689 break;
2690 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2691 BT_DBG("Exit LOCAL_BUSY");
2692 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2693
2694 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2695 struct l2cap_ctrl local_control;
2696
2697 memset(&local_control, 0, sizeof(local_control));
2698 local_control.sframe = 1;
2699 local_control.super = L2CAP_SUPER_RR;
2700 local_control.poll = 1;
2701 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2702 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2703
2704 chan->retry_count = 1;
2705 __set_monitor_timer(chan);
2706 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2707 }
2708 break;
2709 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2710 l2cap_process_reqseq(chan, control->reqseq);
2711 break;
2712 case L2CAP_EV_EXPLICIT_POLL:
2713 l2cap_send_rr_or_rnr(chan, 1);
2714 chan->retry_count = 1;
2715 __set_monitor_timer(chan);
2716 __clear_ack_timer(chan);
2717 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2718 break;
2719 case L2CAP_EV_RETRANS_TO:
2720 l2cap_send_rr_or_rnr(chan, 1);
2721 chan->retry_count = 1;
2722 __set_monitor_timer(chan);
2723 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2724 break;
2725 case L2CAP_EV_RECV_FBIT:
2726 /* Nothing to process */
2727 break;
2728 default:
2729 break;
2730 }
608bcc6d
MM		 2731}
2732
d660366d
GP		 2733static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2734 struct l2cap_ctrl *control,
2735 struct sk_buff_head *skbs, u8 event)
608bcc6d 2736{
608bcc6d
MM		 2737 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2738 event);
2739
2740 switch (event) {
2741 case L2CAP_EV_DATA_REQUEST:
2742 if (chan->tx_send_head == NULL)
2743 chan->tx_send_head = skb_peek(skbs);
2744 /* Queue data, but don't send. */
2745 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2746 break;
2747 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2748 BT_DBG("Enter LOCAL_BUSY");
2749 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2750
2751 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2752 /* The SREJ_SENT state must be aborted if we are to
2753 * enter the LOCAL_BUSY state.
2754 */
2755 l2cap_abort_rx_srej_sent(chan);
2756 }
2757
2758 l2cap_send_ack(chan);
2759
2760 break;
2761 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2762 BT_DBG("Exit LOCAL_BUSY");
2763 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2764
2765 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2766 struct l2cap_ctrl local_control;
2767 memset(&local_control, 0, sizeof(local_control));
2768 local_control.sframe = 1;
2769 local_control.super = L2CAP_SUPER_RR;
2770 local_control.poll = 1;
2771 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2772 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2773
2774 chan->retry_count = 1;
2775 __set_monitor_timer(chan);
2776 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2777 }
2778 break;
2779 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2780 l2cap_process_reqseq(chan, control->reqseq);
2781
2782 /* Fall through */
2783
2784 case L2CAP_EV_RECV_FBIT:
2785 if (control && control->final) {
2786 __clear_monitor_timer(chan);
2787 if (chan->unacked_frames > 0)
2788 __set_retrans_timer(chan);
2789 chan->retry_count = 0;
2790 chan->tx_state = L2CAP_TX_STATE_XMIT;
2791 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2792 }
2793 break;
2794 case L2CAP_EV_EXPLICIT_POLL:
2795 /* Ignore */
2796 break;
2797 case L2CAP_EV_MONITOR_TO:
2798 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2799 l2cap_send_rr_or_rnr(chan, 1);
2800 __set_monitor_timer(chan);
2801 chan->retry_count++;
2802 } else {
5e4e3972 2803 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2804 }
2805 break;
2806 default:
2807 break;
2808 }
608bcc6d
MM		 2809}
2810
d660366d
GP		 2811static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2812 struct sk_buff_head *skbs, u8 event)
608bcc6d 2813{
608bcc6d
MM		 2814 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2815 chan, control, skbs, event, chan->tx_state);
2816
2817 switch (chan->tx_state) {
2818 case L2CAP_TX_STATE_XMIT:
d660366d 2819 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2820 break;
2821 case L2CAP_TX_STATE_WAIT_F:
d660366d 2822 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2823 break;
2824 default:
2825 /* Ignore event */
2826 break;
2827 }
608bcc6d
MM		 2828}
2829
4b51dae9
MM		 2830static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2831 struct l2cap_ctrl *control)
2832{
2833 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2834 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2835}
2836
f80842a8
MM		 2837static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2838 struct l2cap_ctrl *control)
2839{
2840 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2841 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2842}
2843
1da177e4
LT		 2844/* Copy frame to all raw sockets on that connection */
2845static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2846{
1da177e4 2847 struct sk_buff *nskb;
48454079 2848 struct l2cap_chan *chan;
1da177e4
LT		 2849
2850 BT_DBG("conn %p", conn);
2851
3df91ea2 2852 mutex_lock(&conn->chan_lock);
3d57dc68 2853
3df91ea2 2854 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2855 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2856 continue;
2857
7f5396a7 2858 /* Don't send frame to the channel it came from */
a4368ff3 2859 if (bt_cb(skb)->l2cap.chan == chan)
1da177e4 2860 continue;
7f5396a7 2861
8bcde1f2 2862 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2863 if (!nskb)
1da177e4 2864 continue;
80b98027 2865 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2866 kfree_skb(nskb);
2867 }
3d57dc68 2868
3df91ea2 2869 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2870}
2871
2872/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2873static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2874 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2875{
2876 struct sk_buff *skb, **frag;
2877 struct l2cap_cmd_hdr *cmd;
2878 struct l2cap_hdr *lh;
2879 int len, count;
2880
b4400672
AE		 2881 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2882 conn, code, ident, dlen);
1da177e4 2883
300b962e
AL		 2884 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2885 return NULL;
2886
1da177e4
LT		 2887 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2888 count = min_t(unsigned int, conn->mtu, len);
2889
8bcde1f2 2890 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2891 if (!skb)
2892 return NULL;
2893
2894 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2895 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2896
2897 if (conn->hcon->type == LE_LINK)
dcf4adbf 2898 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2899 else
dcf4adbf 2900 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2901
2902 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2903 cmd->code = code;
2904 cmd->ident = ident;
aca3192c 2905 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2906
2907 if (dlen) {
2908 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2909 memcpy(skb_put(skb, count), data, count);
2910 data += count;
2911 }
2912
2913 len -= skb->len;
2914
2915 /* Continuation fragments (no L2CAP header) */
2916 frag = &skb_shinfo(skb)->frag_list;
2917 while (len) {
2918 count = min_t(unsigned int, conn->mtu, len);
2919
8bcde1f2 2920 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2921 if (!*frag)
2922 goto fail;
2923
2924 memcpy(skb_put(*frag, count), data, count);
2925
2926 len -= count;
2927 data += count;
2928
2929 frag = &(*frag)->next;
2930 }
2931
2932 return skb;
2933
2934fail:
2935 kfree_skb(skb);
2936 return NULL;
2937}
2938
2d792818
GP		 2939static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2940 unsigned long *val)
1da177e4
LT		 2941{
2942 struct l2cap_conf_opt *opt = *ptr;
2943 int len;
2944
2945 len = L2CAP_CONF_OPT_SIZE + opt->len;
2946 *ptr += len;
2947
2948 *type = opt->type;
2949 *olen = opt->len;
2950
2951 switch (opt->len) {
2952 case 1:
2953 *val = *((u8 *) opt->val);
2954 break;
2955
2956 case 2:
bfaaeb3e 2957 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2958 break;
2959
2960 case 4:
bfaaeb3e 2961 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2962 break;
2963
2964 default:
2965 *val = (unsigned long) opt->val;
2966 break;
2967 }
2968
b4400672 2969 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2970 return len;
2971}
2972
1da177e4
LT		 2973static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2974{
2975 struct l2cap_conf_opt *opt = *ptr;
2976
b4400672 2977 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2978
2979 opt->type = type;
2980 opt->len = len;
2981
2982 switch (len) {
2983 case 1:
2984 *((u8 *) opt->val) = val;
2985 break;
2986
2987 case 2:
4f8b691c 2988 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2989 break;
2990
2991 case 4:
4f8b691c 2992 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2993 break;
2994
2995 default:
2996 memcpy(opt->val, (void *) val, len);
2997 break;
2998 }
2999
3000 *ptr += L2CAP_CONF_OPT_SIZE + len;
3001}
3002
f89cef09
AE		 3003static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
3004{
3005 struct l2cap_conf_efs efs;
3006
1ec918ce 3007 switch (chan->mode) {
f89cef09
AE		 3008 case L2CAP_MODE_ERTM:
3009 efs.id = chan->local_id;
3010 efs.stype = chan->local_stype;
3011 efs.msdu = cpu_to_le16(chan->local_msdu);
3012 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
dcf4adbf
JP		 3013 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
3014 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3015 break;
3016
3017 case L2CAP_MODE_STREAMING:
3018 efs.id = 1;
3019 efs.stype = L2CAP_SERV_BESTEFFORT;
3020 efs.msdu = cpu_to_le16(chan->local_msdu);
3021 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3022 efs.acc_lat = 0;
3023 efs.flush_to = 0;
3024 break;
3025
3026 default:
3027 return;
3028 }
3029
3030 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3031 (unsigned long) &efs);
f89cef09
AE		 3032}
3033
721c4181 3034static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3035{
721c4181 3036 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3037 ack_timer.work);
3038 u16 frames_to_ack;
c1b4f43b 3039
2fb9b3d4
GP		 3040 BT_DBG("chan %p", chan);
3041
6be36555
AE		 3042 l2cap_chan_lock(chan);
3043
0362520b
MM		 3044 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3045 chan->last_acked_seq);
6be36555 3046
0362520b
MM		 3047 if (frames_to_ack)
3048 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3049
0362520b 3050 l2cap_chan_unlock(chan);
09bfb2ee 3051 l2cap_chan_put(chan);
c1b4f43b
GP		 3052}
3053
466f8004 3054int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3055{
3c588192
MM		 3056 int err;
3057
105bdf9e
MM		 3058 chan->next_tx_seq = 0;
3059 chan->expected_tx_seq = 0;
42e5c802 3060 chan->expected_ack_seq = 0;
6a026610 3061 chan->unacked_frames = 0;
42e5c802 3062 chan->buffer_seq = 0;
6a026610 3063 chan->frames_sent = 0;
105bdf9e
MM		 3064 chan->last_acked_seq = 0;
3065 chan->sdu = NULL;
3066 chan->sdu_last_frag = NULL;
3067 chan->sdu_len = 0;
3068
d34c34fb
MM		 3069 skb_queue_head_init(&chan->tx_q);
3070
6ed971ca
MH		 3071 chan->local_amp_id = AMP_ID_BREDR;
3072 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3073 chan->move_state = L2CAP_MOVE_STABLE;
3074 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3075
105bdf9e
MM		 3076 if (chan->mode != L2CAP_MODE_ERTM)
3077 return 0;
3078
3079 chan->rx_state = L2CAP_RX_STATE_RECV;
3080 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3081
721c4181
GP		 3082 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3083 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3084 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3085
f1c6775b 3086 skb_queue_head_init(&chan->srej_q);
1890d36b 3087
3c588192
MM		 3088 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3089 if (err < 0)
3090 return err;
3091
9dc9affc
MM		 3092 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3093 if (err < 0)
3094 l2cap_seq_list_free(&chan->srej_list);
3095
3096 return err;
0565c1c2
GP		 3097}
3098
f2fcfcd6
GP		 3099static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3100{
3101 switch (mode) {
3102 case L2CAP_MODE_STREAMING:
3103 case L2CAP_MODE_ERTM:
3104 if (l2cap_mode_supported(mode, remote_feat_mask))
3105 return mode;
3106 /* fall through */
3107 default:
3108 return L2CAP_MODE_BASIC;
3109 }
3110}
3111
848566b3 3112static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3113{
0bd49fc7
JH		 3114 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3115 (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW));
6327eb98
AE		 3116}
3117
848566b3 3118static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3119{
0bd49fc7
JH		 3120 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3121 (conn->feat_mask & L2CAP_FEAT_EXT_FLOW));
f89cef09
AE		 3122}
3123
36c86c85
MM		 3124static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3125 struct l2cap_conf_rfc *rfc)
3126{
6ed971ca 3127 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3128 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3129
3130 /* Class 1 devices have must have ERTM timeouts
3131 * exceeding the Link Supervision Timeout. The
3132 * default Link Supervision Timeout for AMP
3133 * controllers is 10 seconds.
3134 *
3135 * Class 1 devices use 0xffffffff for their
3136 * best-effort flush timeout, so the clamping logic
3137 * will result in a timeout that meets the above
3138 * requirement. ERTM timeouts are 16-bit values, so
3139 * the maximum timeout is 65.535 seconds.
3140 */
3141
3142 /* Convert timeout to milliseconds and round */
3143 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3144
3145 /* This is the recommended formula for class 2 devices
3146 * that start ERTM timers when packets are sent to the
3147 * controller.
3148 */
3149 ertm_to = 3 * ertm_to + 500;
3150
3151 if (ertm_to > 0xffff)
3152 ertm_to = 0xffff;
3153
3154 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3155 rfc->monitor_timeout = rfc->retrans_timeout;
3156 } else {
dcf4adbf
JP		 3157 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3158 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
36c86c85
MM		 3159 }
3160}
3161
6327eb98
AE		 3162static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3163{
3164 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3165 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3166 /* use extended control field */
3167 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3168 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3169 } else {
6327eb98 3170 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3171 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3172 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3173 }
c20f8e35 3174 chan->ack_win = chan->tx_win;
6327eb98
AE		 3175}
3176
710f9b0a 3177static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3178{
1da177e4 3179 struct l2cap_conf_req *req = data;
0c1bc5c6 3180 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3181 void *ptr = req->data;
c8f79162 3182 u16 size;
1da177e4 3183
49208c9c 3184 BT_DBG("chan %p", chan);
1da177e4 3185
73ffa904 3186 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3187 goto done;
3188
0c1bc5c6 3189 switch (chan->mode) {
f2fcfcd6
GP		 3190 case L2CAP_MODE_STREAMING:
3191 case L2CAP_MODE_ERTM:
c1360a1c 3192 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3193 break;
85eb53c6 3194
848566b3 3195 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3196 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3197
2ba13ed6 3198 /* fall through */
f2fcfcd6 3199 default:
8c1d787b 3200 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3201 break;
3202 }
3203
3204done:
0c1bc5c6
GP		 3205 if (chan->imtu != L2CAP_DEFAULT_MTU)
3206 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3207
0c1bc5c6 3208 switch (chan->mode) {
65c7c491 3209 case L2CAP_MODE_BASIC:
6fea7ad1
MH		 3210 if (disable_ertm)
3211 break;
3212
8c1d787b 3213 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3214 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3215 break;
3216
62547752
GP		 3217 rfc.mode = L2CAP_MODE_BASIC;
3218 rfc.txwin_size = 0;
3219 rfc.max_transmit = 0;
3220 rfc.retrans_timeout = 0;
3221 rfc.monitor_timeout = 0;
3222 rfc.max_pdu_size = 0;
3223
63406504 3224 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3225 (unsigned long) &rfc);
65c7c491
MH		 3226 break;
3227
3228 case L2CAP_MODE_ERTM:
3229 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3230 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3231
3232 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3233
3234 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3235 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3236 L2CAP_FCS_SIZE);
c8f79162 3237 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3238
6327eb98
AE		 3239 l2cap_txwin_setup(chan);
3240
3241 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3242 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3243
63406504 3244 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3245 (unsigned long) &rfc);
63406504 3246
f89cef09
AE		 3247 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3248 l2cap_add_opt_efs(&ptr, chan);
3249
6327eb98
AE		 3250 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3251 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3252 chan->tx_win);
60918918
AE		 3253
3254 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3255 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3256 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3257 chan->fcs = L2CAP_FCS_NONE;
3258 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3259 chan->fcs);
3260 }
f2fcfcd6
GP		 3261 break;
3262
3263 case L2CAP_MODE_STREAMING:
273759e2 3264 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3265 rfc.mode = L2CAP_MODE_STREAMING;
3266 rfc.txwin_size = 0;
3267 rfc.max_transmit = 0;
3268 rfc.retrans_timeout = 0;
3269 rfc.monitor_timeout = 0;
c8f79162
AE		 3270
3271 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3272 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3273 L2CAP_FCS_SIZE);
c8f79162 3274 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3275
63406504 3276 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3277 (unsigned long) &rfc);
63406504 3278
f89cef09
AE		 3279 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3280 l2cap_add_opt_efs(&ptr, chan);
3281
60918918
AE		 3282 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3283 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3284 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3285 chan->fcs = L2CAP_FCS_NONE;
3286 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3287 chan->fcs);
3288 }
65c7c491
MH		 3289 break;
3290 }
1da177e4 3291
fe4128e0 3292 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3293 req->flags = cpu_to_le16(0);
1da177e4
LT		 3294
3295 return ptr - data;
3296}
3297
73ffa904 3298static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3299{
5dee9e7c
MH		 3300 struct l2cap_conf_rsp *rsp = data;
3301 void *ptr = rsp->data;
73ffa904
GP		 3302 void *req = chan->conf_req;
3303 int len = chan->conf_len;
5dee9e7c
MH		 3304 int type, hint, olen;
3305 unsigned long val;
6464f35f 3306 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3307 struct l2cap_conf_efs efs;
3308 u8 remote_efs = 0;
861d6882 3309 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3310 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3311 u16 size;
1da177e4 3312
73ffa904 3313 BT_DBG("chan %p", chan);
820ae1b8 3314
5dee9e7c
MH		 3315 while (len >= L2CAP_CONF_OPT_SIZE) {
3316 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3317
589d2746 3318 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3319 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3320
3321 switch (type) {
3322 case L2CAP_CONF_MTU:
861d6882 3323 mtu = val;
5dee9e7c
MH		 3324 break;
3325
3326 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3327 chan->flush_to = val;
5dee9e7c
MH		 3328 break;
3329
3330 case L2CAP_CONF_QOS:
3331 break;
3332
6464f35f
MH		 3333 case L2CAP_CONF_RFC:
3334 if (olen == sizeof(rfc))
3335 memcpy(&rfc, (void *) val, olen);
3336 break;
3337
fcc203c3
GP		 3338 case L2CAP_CONF_FCS:
3339 if (val == L2CAP_FCS_NONE)
f2592d3e 3340 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3341 break;
fcc203c3 3342
42dceae2
AE		 3343 case L2CAP_CONF_EFS:
3344 remote_efs = 1;
3345 if (olen == sizeof(efs))
3346 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3347 break;
3348
6327eb98 3349 case L2CAP_CONF_EWS:
0bd49fc7 3350 if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP))
6327eb98 3351 return -ECONNREFUSED;
fcc203c3 3352
6327eb98
AE		 3353 set_bit(FLAG_EXT_CTRL, &chan->flags);
3354 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3355 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3356 chan->remote_tx_win = val;
fcc203c3
GP		 3357 break;
3358
5dee9e7c
MH		 3359 default:
3360 if (hint)
3361 break;
3362
3363 result = L2CAP_CONF_UNKNOWN;
3364 *((u8 *) ptr++) = type;
3365 break;
3366 }
3367 }
3368
73ffa904 3369 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3370 goto done;
3371
0c1bc5c6 3372 switch (chan->mode) {
f2fcfcd6
GP		 3373 case L2CAP_MODE_STREAMING:
3374 case L2CAP_MODE_ERTM:
c1360a1c 3375 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3376 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3377 chan->conn->feat_mask);
85eb53c6
GP		 3378 break;
3379 }
3380
42dceae2 3381 if (remote_efs) {
848566b3 3382 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3383 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3384 else
3385 return -ECONNREFUSED;
3386 }
3387
0c1bc5c6 3388 if (chan->mode != rfc.mode)
f2fcfcd6 3389 return -ECONNREFUSED;
742e519b 3390
f2fcfcd6 3391 break;
f2fcfcd6
GP		 3392 }
3393
3394done:
0c1bc5c6 3395 if (chan->mode != rfc.mode) {
f2fcfcd6 3396 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3397 rfc.mode = chan->mode;
f2fcfcd6 3398
73ffa904 3399 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3400 return -ECONNREFUSED;
3401
2d792818
GP		 3402 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3403 (unsigned long) &rfc);
f2fcfcd6
GP		 3404 }
3405
5dee9e7c
MH		 3406 if (result == L2CAP_CONF_SUCCESS) {
3407 /* Configure output options and let the other side know
3408 * which ones we don't like. */
3409
f2fcfcd6
GP		 3410 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3411 result = L2CAP_CONF_UNACCEPT;
3412 else {
0c1bc5c6 3413 chan->omtu = mtu;
c1360a1c 3414 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3415 }
0c1bc5c6 3416 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3417
42dceae2
AE		 3418 if (remote_efs) {
3419 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3420 efs.stype != L2CAP_SERV_NOTRAFIC &&
3421 efs.stype != chan->local_stype) {
42dceae2
AE		 3422
3423 result = L2CAP_CONF_UNACCEPT;
3424
3425 if (chan->num_conf_req >= 1)
3426 return -ECONNREFUSED;
3427
3428 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3429 sizeof(efs),
3430 (unsigned long) &efs);
0e8b207e 3431 } else {
3e6b3b95 3432 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3433 result = L2CAP_CONF_PENDING;
3434 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3435 }
3436 }
3437
f2fcfcd6
GP		 3438 switch (rfc.mode) {
3439 case L2CAP_MODE_BASIC:
47d1ec61 3440 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3441 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3442 break;
3443
3444 case L2CAP_MODE_ERTM:
6327eb98
AE		 3445 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3446 chan->remote_tx_win = rfc.txwin_size;
3447 else
3448 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3449
2c03a7a4 3450 chan->remote_max_tx = rfc.max_transmit;
1c762159 3451
c8f79162 3452 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3453 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3454 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3455 rfc.max_pdu_size = cpu_to_le16(size);
3456 chan->remote_mps = size;
f2fcfcd6 3457
36c86c85 3458 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3459
c1360a1c 3460 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3461
3462 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3463 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3464
42dceae2
AE		 3465 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3466 chan->remote_id = efs.id;
3467 chan->remote_stype = efs.stype;
3468 chan->remote_msdu = le16_to_cpu(efs.msdu);
3469 chan->remote_flush_to =
2d792818 3470 le32_to_cpu(efs.flush_to);
42dceae2 3471 chan->remote_acc_lat =
2d792818 3472 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3473 chan->remote_sdu_itime =
3474 le32_to_cpu(efs.sdu_itime);
3475 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3476 sizeof(efs),
3477 (unsigned long) &efs);
42dceae2 3478 }
f2fcfcd6
GP		 3479 break;
3480
3481 case L2CAP_MODE_STREAMING:
c8f79162 3482 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3483 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3484 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3485 rfc.max_pdu_size = cpu_to_le16(size);
3486 chan->remote_mps = size;
f2fcfcd6 3487
c1360a1c 3488 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3489
2d792818
GP		 3490 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3491 (unsigned long) &rfc);
68ae6639 3492
f2fcfcd6
GP		 3493 break;
3494
3495 default:
5dee9e7c 3496 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3497
6464f35f 3498 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3499 rfc.mode = chan->mode;
f2fcfcd6 3500 }
6464f35f 3501
f2fcfcd6 3502 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3503 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3504 }
fe4128e0 3505 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3506 rsp->result = cpu_to_le16(result);
dcf4adbf 3507 rsp->flags = cpu_to_le16(0);
5dee9e7c
MH		 3508
3509 return ptr - data;
1da177e4
LT		 3510}
3511
2d792818
GP		 3512static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3513 void *data, u16 *result)
f2fcfcd6 3514{
f2fcfcd6
GP		 3515 struct l2cap_conf_req *req = data;
3516 void *ptr = req->data;
3517 int type, olen;
3518 unsigned long val;
36e999a8 3519 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3520 struct l2cap_conf_efs efs;
f2fcfcd6 3521
fe4128e0 3522 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3523
3524 while (len >= L2CAP_CONF_OPT_SIZE) {
3525 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3526
3527 switch (type) {
3528 case L2CAP_CONF_MTU:
3529 if (val < L2CAP_DEFAULT_MIN_MTU) {
3530 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3531 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3532 } else
0c1bc5c6
GP		 3533 chan->imtu = val;
3534 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3535 break;
3536
3537 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3538 chan->flush_to = val;
f2fcfcd6 3539 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3540 2, chan->flush_to);
f2fcfcd6
GP		 3541 break;
3542
3543 case L2CAP_CONF_RFC:
3544 if (olen == sizeof(rfc))
3545 memcpy(&rfc, (void *)val, olen);
3546
c1360a1c 3547 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3548 rfc.mode != chan->mode)
f2fcfcd6
GP		 3549 return -ECONNREFUSED;
3550
47d1ec61 3551 chan->fcs = 0;
f2fcfcd6
GP		 3552
3553 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3554 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3555 break;
6327eb98
AE		 3556
3557 case L2CAP_CONF_EWS:
c20f8e35 3558 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3559 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3560 chan->tx_win);
6327eb98 3561 break;
66af7aaf
AE		 3562
3563 case L2CAP_CONF_EFS:
3564 if (olen == sizeof(efs))
3565 memcpy(&efs, (void *)val, olen);
3566
3567 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3568 efs.stype != L2CAP_SERV_NOTRAFIC &&
3569 efs.stype != chan->local_stype)
66af7aaf
AE		 3570 return -ECONNREFUSED;
3571
2d792818
GP		 3572 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3573 (unsigned long) &efs);
66af7aaf 3574 break;
cbabee78
AE		 3575
3576 case L2CAP_CONF_FCS:
3577 if (*result == L2CAP_CONF_PENDING)
3578 if (val == L2CAP_FCS_NONE)
f2592d3e 3579 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3580 &chan->conf_state);
3581 break;
f2fcfcd6
GP		 3582 }
3583 }
3584
0c1bc5c6 3585 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3586 return -ECONNREFUSED;
3587
0c1bc5c6 3588 chan->mode = rfc.mode;
6c2ea7a8 3589
0e8b207e 3590 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3591 switch (rfc.mode) {
3592 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3593 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3594 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3595 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3596 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3597 chan->ack_win = min_t(u16, chan->ack_win,
3598 rfc.txwin_size);
66af7aaf
AE		 3599
3600 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3601 chan->local_msdu = le16_to_cpu(efs.msdu);
3602 chan->local_sdu_itime =
2d792818 3603 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3604 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3605 chan->local_flush_to =
2d792818 3606 le32_to_cpu(efs.flush_to);
66af7aaf 3607 }
f2fcfcd6 3608 break;
66af7aaf 3609
f2fcfcd6 3610 case L2CAP_MODE_STREAMING:
47d1ec61 3611 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3612 }
3613 }
3614
fe4128e0 3615 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3616 req->flags = cpu_to_le16(0);
f2fcfcd6
GP		 3617
3618 return ptr - data;
3619}
3620
2d792818
GP		 3621static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3622 u16 result, u16 flags)
1da177e4
LT		 3623{
3624 struct l2cap_conf_rsp *rsp = data;
3625 void *ptr = rsp->data;
1da177e4 3626
fe4128e0 3627 BT_DBG("chan %p", chan);
1da177e4 3628
fe4128e0 3629 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3630 rsp->result = cpu_to_le16(result);
aca3192c 3631 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3632
3633 return ptr - data;
3634}
3635
27e2d4c8
JH		 3636void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3637{
3638 struct l2cap_le_conn_rsp rsp;
3639 struct l2cap_conn *conn = chan->conn;
3640
3641 BT_DBG("chan %p", chan);
3642
3643 rsp.dcid = cpu_to_le16(chan->scid);
3644 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3645 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3646 rsp.credits = cpu_to_le16(chan->rx_credits);
dcf4adbf 3647 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
27e2d4c8
JH		 3648
3649 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3650 &rsp);
3651}
3652
8c1d787b 3653void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3654{
3655 struct l2cap_conn_rsp rsp;
8c1d787b 3656 struct l2cap_conn *conn = chan->conn;
710f9b0a 3657 u8 buf[128];
439f34ac 3658 u8 rsp_code;
710f9b0a 3659
fe4128e0
GP		 3660 rsp.scid = cpu_to_le16(chan->dcid);
3661 rsp.dcid = cpu_to_le16(chan->scid);
dcf4adbf
JP		 3662 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3663 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3664
3665 if (chan->hs_hcon)
3666 rsp_code = L2CAP_CREATE_CHAN_RSP;
3667 else
3668 rsp_code = L2CAP_CONN_RSP;
3669
3670 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3671
3672 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3673
c1360a1c 3674 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3675 return;
3676
710f9b0a 3677 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3678 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3679 chan->num_conf_req++;
3680}
3681
47d1ec61 3682static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3683{
7b1c0049
GP		 3684 int type, olen;
3685 unsigned long val;
c20f8e35
MM		 3686 /* Use sane default values in case a misbehaving remote device
3687 * did not send an RFC or extended window size option.
3688 */
3689 u16 txwin_ext = chan->ack_win;
3690 struct l2cap_conf_rfc rfc = {
3691 .mode = chan->mode,
dcf4adbf
JP		 3692 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3693 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
c20f8e35
MM		 3694 .max_pdu_size = cpu_to_le16(chan->imtu),
3695 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3696 };
7b1c0049 3697
47d1ec61 3698 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3699
0c1bc5c6 3700 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3701 return;
3702
3703 while (len >= L2CAP_CONF_OPT_SIZE) {
3704 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3705
c20f8e35
MM		 3706 switch (type) {
3707 case L2CAP_CONF_RFC:
3708 if (olen == sizeof(rfc))
3709 memcpy(&rfc, (void *)val, olen);
8f321f85 3710 break;
c20f8e35
MM		 3711 case L2CAP_CONF_EWS:
3712 txwin_ext = val;
3713 break;
3714 }
7b1c0049
GP		 3715 }
3716
7b1c0049
GP		 3717 switch (rfc.mode) {
3718 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3719 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3720 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3721 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3722 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3723 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3724 else
3725 chan->ack_win = min_t(u16, chan->ack_win,
3726 rfc.txwin_size);
7b1c0049
GP		 3727 break;
3728 case L2CAP_MODE_STREAMING:
47d1ec61 3729 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3730 }
3731}
3732
2d792818 3733static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3734 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3735 u8 *data)
4e8402a3 3736{
e2fd318e 3737 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3738
cb3b3152
JH		 3739 if (cmd_len < sizeof(*rej))
3740 return -EPROTO;
3741
e2fd318e 3742 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3743 return 0;
3744
3745 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3746 cmd->ident == conn->info_ident) {
17cd3f37 3747 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3748
3749 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3750 conn->info_ident = 0;
984947dc 3751
4e8402a3
MH		 3752 l2cap_conn_start(conn);
3753 }
3754
3755 return 0;
3756}
3757
1700915f
MM		 3758static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3759 struct l2cap_cmd_hdr *cmd,
3760 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3761{
1da177e4
LT		 3762 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3763 struct l2cap_conn_rsp rsp;
23691d75 3764 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3765 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3766
3767 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3768 __le16 psm = req->psm;
1da177e4 3769
097db76c 3770 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3771
3772 /* Check if we have socket listening on psm */
6f59b904 3773 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3774 &conn->hcon->dst, ACL_LINK);
23691d75 3775 if (!pchan) {
1da177e4
LT		 3776 result = L2CAP_CR_BAD_PSM;
3777 goto sendresp;
3778 }
3779
3df91ea2 3780 mutex_lock(&conn->chan_lock);
8ffb9290 3781 l2cap_chan_lock(pchan);
e0f0cb56 3782
e7c29cb1 3783 /* Check if the ACL is secure enough (if not SDP) */
dcf4adbf 3784 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3785 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3786 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3787 result = L2CAP_CR_SEC_BLOCK;
3788 goto response;
3789 }
3790
1da177e4
LT		 3791 result = L2CAP_CR_NO_MEM;
3792
2dfa1003
GP		 3793 /* Check if we already have channel with that dcid */
3794 if (__l2cap_get_chan_by_dcid(conn, scid))
3795 goto response;
3796
80b98027 3797 chan = pchan->ops->new_connection(pchan);
80808e43 3798 if (!chan)
1da177e4
LT		 3799 goto response;
3800
330b6c15
SS		 3801 /* For certain devices (ex: HID mouse), support for authentication,
3802 * pairing and bonding is optional. For such devices, inorder to avoid
3803 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3804 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3805 */
3806 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3807
7eafc59e
MH		 3808 bacpy(&chan->src, &conn->hcon->src);
3809 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 3810 chan->src_type = bdaddr_src_type(conn->hcon);
3811 chan->dst_type = bdaddr_dst_type(conn->hcon);
fe4128e0
GP		 3812 chan->psm = psm;
3813 chan->dcid = scid;
1700915f 3814 chan->local_amp_id = amp_id;
1da177e4 3815
6be36555 3816 __l2cap_chan_add(conn, chan);
48454079 3817
fe4128e0 3818 dcid = chan->scid;
1da177e4 3819
8d836d71 3820 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3821
fc7f8a7e 3822 chan->ident = cmd->ident;
1da177e4 3823
984947dc 3824 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
e7cafc45 3825 if (l2cap_chan_check_security(chan, false)) {
bdc25783 3826 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3827 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3828 result = L2CAP_CR_PEND;
3829 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3830 chan->ops->defer(chan);
f66dc81f 3831 } else {
1700915f
MM		 3832 /* Force pending result for AMP controllers.
3833 * The connection will succeed after the
3834 * physical link is up.
3835 */
6ed971ca 3836 if (amp_id == AMP_ID_BREDR) {
f93fa273 3837 l2cap_state_change(chan, BT_CONFIG);
1700915f 3838 result = L2CAP_CR_SUCCESS;
6ed971ca 3839 } else {
f93fa273 3840 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3841 result = L2CAP_CR_PEND;
1700915f 3842 }
f66dc81f
MH		 3843 status = L2CAP_CS_NO_INFO;
3844 }
79d554a6 3845 } else {
f93fa273 3846 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3847 result = L2CAP_CR_PEND;
3848 status = L2CAP_CS_AUTHEN_PEND;
3849 }
3850 } else {
f93fa273 3851 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3852 result = L2CAP_CR_PEND;
3853 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3854 }
3855
1da177e4 3856response:
8ffb9290 3857 l2cap_chan_unlock(pchan);
3df91ea2 3858 mutex_unlock(&conn->chan_lock);
a24cce14 3859 l2cap_chan_put(pchan);
1da177e4
LT		 3860
3861sendresp:
aca3192c
YH		 3862 rsp.scid = cpu_to_le16(scid);
3863 rsp.dcid = cpu_to_le16(dcid);
3864 rsp.result = cpu_to_le16(result);
3865 rsp.status = cpu_to_le16(status);
4c89b6aa 3866 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3867
3868 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3869 struct l2cap_info_req info;
dcf4adbf 3870 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3871
3872 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3873 conn->info_ident = l2cap_get_ident(conn);
3874
ba13ccd9 3875 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3876
2d792818
GP		 3877 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3878 sizeof(info), &info);
79d554a6
MH		 3879 }
3880
c1360a1c 3881 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3882 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3883 u8 buf[128];
c1360a1c 3884 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3885 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3886 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3887 chan->num_conf_req++;
e9aeb2dd 3888 }
1700915f
MM		 3889
3890 return chan;
4c89b6aa 3891}
e9aeb2dd 3892
4c89b6aa 3893static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3894 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3895{
7b064eda
JK		 3896 struct hci_dev *hdev = conn->hcon->hdev;
3897 struct hci_conn *hcon = conn->hcon;
3898
cb3b3152
JH		 3899 if (cmd_len < sizeof(struct l2cap_conn_req))
3900 return -EPROTO;
3901
7b064eda 3902 hci_dev_lock(hdev);
d7a5a11d 3903 if (hci_dev_test_flag(hdev, HCI_MGMT) &&
7b064eda 3904 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
48ec92fa 3905 mgmt_device_connected(hdev, hcon, 0, NULL, 0);
7b064eda
JK		 3906 hci_dev_unlock(hdev);
3907
300229f9 3908 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3909 return 0;
3910}
3911
5909cf30 3912static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3913 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3914 u8 *data)
1da177e4
LT		 3915{
3916 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3917 u16 scid, dcid, result, status;
48454079 3918 struct l2cap_chan *chan;
1da177e4 3919 u8 req[128];
3df91ea2 3920 int err;
1da177e4 3921
cb3b3152
JH		 3922 if (cmd_len < sizeof(*rsp))
3923 return -EPROTO;
3924
1da177e4
LT		 3925 scid = __le16_to_cpu(rsp->scid);
3926 dcid = __le16_to_cpu(rsp->dcid);
3927 result = __le16_to_cpu(rsp->result);
3928 status = __le16_to_cpu(rsp->status);
3929
1b009c98 3930 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3931 dcid, scid, result, status);
1da177e4 3932
3df91ea2
AE		 3933 mutex_lock(&conn->chan_lock);
3934
1da177e4 3935 if (scid) {
3df91ea2
AE		 3936 chan = __l2cap_get_chan_by_scid(conn, scid);
3937 if (!chan) {
21870b52 3938 err = -EBADSLT;
3df91ea2
AE		 3939 goto unlock;
3940 }
1da177e4 3941 } else {
3df91ea2
AE		 3942 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3943 if (!chan) {
21870b52 3944 err = -EBADSLT;
3df91ea2
AE		 3945 goto unlock;
3946 }
1da177e4
LT		 3947 }
3948
3df91ea2
AE		 3949 err = 0;
3950
6be36555 3951 l2cap_chan_lock(chan);
48454079 3952
1da177e4
LT		 3953 switch (result) {
3954 case L2CAP_CR_SUCCESS:
89bc500e 3955 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3956 chan->ident = 0;
fe4128e0 3957 chan->dcid = dcid;
c1360a1c 3958 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3959
c1360a1c 3960 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3961 break;
3962
1da177e4 3963 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3964 l2cap_build_conf_req(chan, req), req);
73ffa904 3965 chan->num_conf_req++;
1da177e4
LT		 3966 break;
3967
3968 case L2CAP_CR_PEND:
c1360a1c 3969 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3970 break;
3971
3972 default:
48454079 3973 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3974 break;
3975 }
3976
6be36555 3977 l2cap_chan_unlock(chan);
3df91ea2
AE		 3978
3979unlock:
3980 mutex_unlock(&conn->chan_lock);
3981
3982 return err;
1da177e4
LT		 3983}
3984
47d1ec61 3985static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3986{
3987 /* FCS is enabled only in ERTM or streaming mode, if one or both
3988 * sides request it.
3989 */
0c1bc5c6 3990 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3991 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3992 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3993 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3994}
3995
29d8a590
AE		 3996static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3997 u8 ident, u16 flags)
3998{
3999 struct l2cap_conn *conn = chan->conn;
4000
4001 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
4002 flags);
4003
4004 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
4005 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
4006
4007 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4008 l2cap_build_conf_rsp(chan, data,
4009 L2CAP_CONF_SUCCESS, flags), data);
4010}
4011
662d652d
JH		 4012static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4013 u16 scid, u16 dcid)
4014{
4015 struct l2cap_cmd_rej_cid rej;
4016
dcf4adbf 4017 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
662d652d
JH		 4018 rej.scid = __cpu_to_le16(scid);
4019 rej.dcid = __cpu_to_le16(dcid);
4020
4021 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4022}
4023
2d792818
GP		 4024static inline int l2cap_config_req(struct l2cap_conn *conn,
4025 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4026 u8 *data)
1da177e4
LT		 4027{
4028 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4029 u16 dcid, flags;
4030 u8 rsp[64];
48454079 4031 struct l2cap_chan *chan;
3c588192 4032 int len, err = 0;
1da177e4 4033
cb3b3152
JH		 4034 if (cmd_len < sizeof(*req))
4035 return -EPROTO;
4036
1da177e4
LT		 4037 dcid = __le16_to_cpu(req->dcid);
4038 flags = __le16_to_cpu(req->flags);
4039
4040 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4041
baa7e1fa 4042 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4043 if (!chan) {
4044 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4045 return 0;
4046 }
1da177e4 4047
033b1142 4048 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4049 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4050 chan->dcid);
354f60a9 4051 goto unlock;
df6bd743 4052 }
354f60a9 4053
5dee9e7c 4054 /* Reject if config buffer is too small. */
88219a0f 4055 len = cmd_len - sizeof(*req);
cb3b3152 4056 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4057 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4058 l2cap_build_conf_rsp(chan, rsp,
4059 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4060 goto unlock;
4061 }
4062
4063 /* Store config. */
73ffa904
GP		 4064 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4065 chan->conf_len += len;
1da177e4 4066
59e54bd1 4067 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4068 /* Incomplete config. Send empty response. */
4069 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4070 l2cap_build_conf_rsp(chan, rsp,
4071 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4072 goto unlock;
4073 }
4074
4075 /* Complete config. */
73ffa904 4076 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4077 if (len < 0) {
5e4e3972 4078 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4079 goto unlock;
f2fcfcd6 4080 }
1da177e4 4081
1500109b 4082 chan->ident = cmd->ident;
5dee9e7c 4083 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4084 chan->num_conf_rsp++;
5dee9e7c 4085
5dee9e7c 4086 /* Reset config buffer. */
73ffa904 4087 chan->conf_len = 0;
5dee9e7c 4088
c1360a1c 4089 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4090 goto unlock;
4091
c1360a1c 4092 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4093 set_default_fcs(chan);
fcc203c3 4094
105bdf9e
MM		 4095 if (chan->mode == L2CAP_MODE_ERTM ||
4096 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4097 err = l2cap_ertm_init(chan);
4098
4099 if (err < 0)
5e4e3972 4100 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4101 else
4102 l2cap_chan_ready(chan);
0565c1c2 4103
876d9484
MH		 4104 goto unlock;
4105 }
4106
c1360a1c 4107 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4108 u8 buf[64];
1da177e4 4109 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4110 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4111 chan->num_conf_req++;
1da177e4
LT		 4112 }
4113
49c922bb 4114 /* Got Conf Rsp PENDING from remote side and assume we sent
0e8b207e
AE		 4115 Conf Rsp PENDING in the code above */
4116 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4117 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4118
4119 /* check compatibility */
4120
79de886d 4121 /* Send rsp for BR/EDR channel */
f351bc72 4122 if (!chan->hs_hcon)
79de886d
AE		 4123 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4124 else
4125 chan->ident = cmd->ident;
0e8b207e
AE		 4126 }
4127
1da177e4 4128unlock:
6be36555 4129 l2cap_chan_unlock(chan);
3c588192 4130 return err;
1da177e4
LT		 4131}
4132
2d792818 4133static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4134 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4135 u8 *data)
1da177e4
LT		 4136{
4137 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4138 u16 scid, flags, result;
48454079 4139 struct l2cap_chan *chan;
cb3b3152 4140 int len = cmd_len - sizeof(*rsp);
3c588192 4141 int err = 0;
1da177e4 4142
cb3b3152
JH		 4143 if (cmd_len < sizeof(*rsp))
4144 return -EPROTO;
4145
1da177e4
LT		 4146 scid = __le16_to_cpu(rsp->scid);
4147 flags = __le16_to_cpu(rsp->flags);
4148 result = __le16_to_cpu(rsp->result);
4149
61386cba
AE		 4150 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4151 result, len);
1da177e4 4152
baa7e1fa 4153 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4154 if (!chan)
1da177e4
LT		 4155 return 0;
4156
4157 switch (result) {
4158 case L2CAP_CONF_SUCCESS:
47d1ec61 4159 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4160 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4161 break;
4162
0e8b207e
AE		 4163 case L2CAP_CONF_PENDING:
4164 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4165
4166 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4167 char buf[64];
4168
4169 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4170 buf, &result);
0e8b207e 4171 if (len < 0) {
5e4e3972 4172 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4173 goto done;
4174 }
4175
f351bc72 4176 if (!chan->hs_hcon) {
79de886d
AE		 4177 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4178 0);
5ce66b59
AE		 4179 } else {
4180 if (l2cap_check_efs(chan)) {
4181 amp_create_logical_link(chan);
4182 chan->ident = cmd->ident;
4183 }
4184 }
0e8b207e
AE		 4185 }
4186 goto done;
4187
1da177e4 4188 case L2CAP_CONF_UNACCEPT:
73ffa904 4189 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4190 char req[64];
4191
c2c77ec8 4192 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4193 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4194 goto done;
4195 }
4196
f2fcfcd6
GP		 4197 /* throw out any old stored conf requests */
4198 result = L2CAP_CONF_SUCCESS;
b4450035 4199 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4200 req, &result);
f2fcfcd6 4201 if (len < 0) {
5e4e3972 4202 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4203 goto done;
4204 }
4205
4206 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4207 L2CAP_CONF_REQ, len, req);
73ffa904 4208 chan->num_conf_req++;
f2fcfcd6
GP		 4209 if (result != L2CAP_CONF_SUCCESS)
4210 goto done;
4211 break;
1da177e4
LT		 4212 }
4213
8e87d142 4214 default:
6be36555 4215 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4216
ba13ccd9 4217 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4218 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4219 goto done;
4220 }
4221
59e54bd1 4222 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4223 goto done;
4224
c1360a1c 4225 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4226
c1360a1c 4227 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4228 set_default_fcs(chan);
fcc203c3 4229
105bdf9e
MM		 4230 if (chan->mode == L2CAP_MODE_ERTM ||
4231 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4232 err = l2cap_ertm_init(chan);
0565c1c2 4233
3c588192 4234 if (err < 0)
5e4e3972 4235 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4236 else
4237 l2cap_chan_ready(chan);
1da177e4
LT		 4238 }
4239
4240done:
6be36555 4241 l2cap_chan_unlock(chan);
3c588192 4242 return err;
1da177e4
LT		 4243}
4244
2d792818 4245static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4246 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4247 u8 *data)
1da177e4
LT		 4248{
4249 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4250 struct l2cap_disconn_rsp rsp;
4251 u16 dcid, scid;
48454079 4252 struct l2cap_chan *chan;
1da177e4 4253
cb3b3152
JH		 4254 if (cmd_len != sizeof(*req))
4255 return -EPROTO;
4256
1da177e4
LT		 4257 scid = __le16_to_cpu(req->scid);
4258 dcid = __le16_to_cpu(req->dcid);
4259
4260 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4261
3df91ea2
AE		 4262 mutex_lock(&conn->chan_lock);
4263
4264 chan = __l2cap_get_chan_by_scid(conn, dcid);
4265 if (!chan) {
4266 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4267 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4268 return 0;
3df91ea2 4269 }
1da177e4 4270
6be36555
AE		 4271 l2cap_chan_lock(chan);
4272
fe4128e0
GP		 4273 rsp.dcid = cpu_to_le16(chan->scid);
4274 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4275 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4276
5ec1bbe5 4277 chan->ops->set_shutdown(chan);
1da177e4 4278
61d6ef3e 4279 l2cap_chan_hold(chan);
48454079 4280 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4281
4282 l2cap_chan_unlock(chan);
1da177e4 4283
80b98027 4284 chan->ops->close(chan);
61d6ef3e 4285 l2cap_chan_put(chan);
3df91ea2
AE		 4286
4287 mutex_unlock(&conn->chan_lock);
4288
1da177e4
LT		 4289 return 0;
4290}
4291
2d792818 4292static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4293 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4294 u8 *data)
1da177e4
LT		 4295{
4296 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4297 u16 dcid, scid;
48454079 4298 struct l2cap_chan *chan;
1da177e4 4299
cb3b3152
JH		 4300 if (cmd_len != sizeof(*rsp))
4301 return -EPROTO;
4302
1da177e4
LT		 4303 scid = __le16_to_cpu(rsp->scid);
4304 dcid = __le16_to_cpu(rsp->dcid);
4305
4306 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4307
3df91ea2
AE		 4308 mutex_lock(&conn->chan_lock);
4309
4310 chan = __l2cap_get_chan_by_scid(conn, scid);
4311 if (!chan) {
4312 mutex_unlock(&conn->chan_lock);
1da177e4 4313 return 0;
3df91ea2 4314 }
1da177e4 4315
6be36555 4316 l2cap_chan_lock(chan);
48454079 4317
61d6ef3e 4318 l2cap_chan_hold(chan);
48454079 4319 l2cap_chan_del(chan, 0);
6be36555
AE		 4320
4321 l2cap_chan_unlock(chan);
1da177e4 4322
80b98027 4323 chan->ops->close(chan);
61d6ef3e 4324 l2cap_chan_put(chan);
3df91ea2
AE		 4325
4326 mutex_unlock(&conn->chan_lock);
4327
1da177e4
LT		 4328 return 0;
4329}
4330
2d792818 4331static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4332 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4333 u8 *data)
1da177e4
LT		 4334{
4335 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4336 u16 type;
4337
cb3b3152
JH		 4338 if (cmd_len != sizeof(*req))
4339 return -EPROTO;
4340
1da177e4
LT		 4341 type = __le16_to_cpu(req->type);
4342
4343 BT_DBG("type 0x%4.4x", type);
4344
f0709e03
MH		 4345 if (type == L2CAP_IT_FEAT_MASK) {
4346 u8 buf[8];
44dd46de 4347 u32 feat_mask = l2cap_feat_mask;
f0709e03 4348 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
dcf4adbf
JP		 4349 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4350 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4351 if (!disable_ertm)
fcc203c3 4352 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4353 | L2CAP_FEAT_FCS;
0bd49fc7 4354 if (conn->local_fixed_chan & L2CAP_FC_A2MP)
6327eb98 4355 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4356 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4357
1b7bf4ed 4358 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4359 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4360 buf);
e1027a7c
MH		 4361 } else if (type == L2CAP_IT_FIXED_CHAN) {
4362 u8 buf[12];
4363 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4364
dcf4adbf
JP		 4365 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4366 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
0bd49fc7
JH		 4367 rsp->data[0] = conn->local_fixed_chan;
4368 memset(rsp->data + 1, 0, 7);
2d792818
GP		 4369 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4370 buf);
f0709e03
MH		 4371 } else {
4372 struct l2cap_info_rsp rsp;
4373 rsp.type = cpu_to_le16(type);
dcf4adbf 4374 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4375 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4376 &rsp);
f0709e03 4377 }
1da177e4
LT		 4378
4379 return 0;
4380}
4381
2d792818 4382static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4383 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4384 u8 *data)
1da177e4
LT		 4385{
4386 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4387 u16 type, result;
4388
3f6fa3d4 4389 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4390 return -EPROTO;
4391
1da177e4
LT		 4392 type = __le16_to_cpu(rsp->type);
4393 result = __le16_to_cpu(rsp->result);
4394
4395 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4396
e90165be
AE		 4397 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4398 if (cmd->ident != conn->info_ident ||
2d792818 4399 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4400 return 0;
4401
17cd3f37 4402 cancel_delayed_work(&conn->info_timer);
4e8402a3 4403
adb08ede
VT		 4404 if (result != L2CAP_IR_SUCCESS) {
4405 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4406 conn->info_ident = 0;
4407
4408 l2cap_conn_start(conn);
4409
4410 return 0;
4411 }
4412
978c93b9
AE		 4413 switch (type) {
4414 case L2CAP_IT_FEAT_MASK:
83985319 4415 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4416
47ec1dcd 4417 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4418 struct l2cap_info_req req;
dcf4adbf 4419 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4420
4421 conn->info_ident = l2cap_get_ident(conn);
4422
4423 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4424 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4425 } else {
4426 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4427 conn->info_ident = 0;
4428
4429 l2cap_conn_start(conn);
4430 }
978c93b9
AE		 4431 break;
4432
4433 case L2CAP_IT_FIXED_CHAN:
0bd49fc7 4434 conn->remote_fixed_chan = rsp->data[0];
984947dc 4435 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4436 conn->info_ident = 0;
984947dc
MH		 4437
4438 l2cap_conn_start(conn);
978c93b9 4439 break;
984947dc 4440 }
4e8402a3 4441
1da177e4
LT		 4442 return 0;
4443}
4444
1700915f
MM		 4445static int l2cap_create_channel_req(struct l2cap_conn *conn,
4446 struct l2cap_cmd_hdr *cmd,
4447 u16 cmd_len, void *data)
f94ff6ff
MM		 4448{
4449 struct l2cap_create_chan_req *req = data;
6e1df6a6 4450 struct l2cap_create_chan_rsp rsp;
1700915f 4451 struct l2cap_chan *chan;
6e1df6a6 4452 struct hci_dev *hdev;
f94ff6ff
MM		 4453 u16 psm, scid;
4454
4455 if (cmd_len != sizeof(*req))
4456 return -EPROTO;
4457
0bd49fc7 4458 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
f94ff6ff
MM		 4459 return -EINVAL;
4460
4461 psm = le16_to_cpu(req->psm);
4462 scid = le16_to_cpu(req->scid);
4463
ad0ac6ca 4464 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4465
6e1df6a6 4466 /* For controller id 0 make BR/EDR connection */
6ed971ca 4467 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4468 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4469 req->amp_id);
4470 return 0;
4471 }
1700915f 4472
6e1df6a6
AE		 4473 /* Validate AMP controller id */
4474 hdev = hci_dev_get(req->amp_id);
4475 if (!hdev)
4476 goto error;
1700915f 4477
6e1df6a6
AE		 4478 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4479 hci_dev_put(hdev);
4480 goto error;
4481 }
1700915f 4482
6e1df6a6
AE		 4483 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4484 req->amp_id);
4485 if (chan) {
4486 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4487 struct hci_conn *hs_hcon;
1700915f 4488
98e0f7ea
MH		 4489 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4490 &conn->hcon->dst);
6e1df6a6
AE		 4491 if (!hs_hcon) {
4492 hci_dev_put(hdev);
662d652d
JH		 4493 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4494 chan->dcid);
4495 return 0;
1700915f
MM		 4496 }
4497
6e1df6a6
AE		 4498 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4499
6e1df6a6
AE		 4500 mgr->bredr_chan = chan;
4501 chan->hs_hcon = hs_hcon;
fd45bf4c 4502 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4503 conn->mtu = hdev->block_mtu;
1700915f 4504 }
f94ff6ff 4505
6e1df6a6 4506 hci_dev_put(hdev);
f94ff6ff
MM		 4507
4508 return 0;
6e1df6a6
AE		 4509
4510error:
4511 rsp.dcid = 0;
4512 rsp.scid = cpu_to_le16(scid);
dcf4adbf
JP		 4513 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4514 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
6e1df6a6
AE		 4515
4516 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4517 sizeof(rsp), &rsp);
4518
dc280801 4519 return 0;
f94ff6ff
MM		 4520}
4521
8eb200bd
MM		 4522static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4523{
4524 struct l2cap_move_chan_req req;
4525 u8 ident;
4526
4527 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4528
4529 ident = l2cap_get_ident(chan->conn);
4530 chan->ident = ident;
4531
4532 req.icid = cpu_to_le16(chan->scid);
4533 req.dest_amp_id = dest_amp_id;
4534
4535 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4536 &req);
4537
4538 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4539}
4540
1500109b 4541static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4542{
4543 struct l2cap_move_chan_rsp rsp;
4544
1500109b 4545 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4546
1500109b 4547 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4548 rsp.result = cpu_to_le16(result);
4549
1500109b
MM		 4550 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4551 sizeof(rsp), &rsp);
8d5a04a1
MM		 4552}
4553
5b155ef9 4554static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4555{
4556 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4557
5b155ef9 4558 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4559
5b155ef9 4560 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4561
5b155ef9 4562 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4563 cfm.result = cpu_to_le16(result);
4564
5b155ef9
MM		 4565 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4566 sizeof(cfm), &cfm);
4567
4568 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4569}
4570
4571static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4572{
4573 struct l2cap_move_chan_cfm cfm;
4574
4575 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4576
4577 cfm.icid = cpu_to_le16(icid);
dcf4adbf 4578 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
5b155ef9
MM		 4579
4580 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4581 sizeof(cfm), &cfm);
8d5a04a1
MM		 4582}
4583
4584static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4585 u16 icid)
8d5a04a1
MM		 4586{
4587 struct l2cap_move_chan_cfm_rsp rsp;
4588
ad0ac6ca 4589 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4590
4591 rsp.icid = cpu_to_le16(icid);
4592 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4593}
4594
5f3847a4
MM		 4595static void __release_logical_link(struct l2cap_chan *chan)
4596{
4597 chan->hs_hchan = NULL;
4598 chan->hs_hcon = NULL;
4599
4600 /* Placeholder - release the logical link */
4601}
4602
1500109b
MM		 4603static void l2cap_logical_fail(struct l2cap_chan *chan)
4604{
4605 /* Logical link setup failed */
4606 if (chan->state != BT_CONNECTED) {
4607 /* Create channel failure, disconnect */
5e4e3972 4608 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4609 return;
4610 }
4611
4612 switch (chan->move_role) {
4613 case L2CAP_MOVE_ROLE_RESPONDER:
4614 l2cap_move_done(chan);
4615 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4616 break;
4617 case L2CAP_MOVE_ROLE_INITIATOR:
4618 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4619 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4620 /* Remote has only sent pending or
4621 * success responses, clean up
4622 */
4623 l2cap_move_done(chan);
4624 }
4625
4626 /* Other amp move states imply that the move
4627 * has already aborted
4628 */
4629 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4630 break;
4631 }
4632}
4633
4634static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4635 struct hci_chan *hchan)
4636{
4637 struct l2cap_conf_rsp rsp;
1500109b 4638
336178a3 4639 chan->hs_hchan = hchan;
1500109b
MM		 4640 chan->hs_hcon->l2cap_data = chan->conn;
4641
35ba9561 4642 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4643
4644 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4645 int err;
1500109b
MM		 4646
4647 set_default_fcs(chan);
4648
4649 err = l2cap_ertm_init(chan);
4650 if (err < 0)
5e4e3972 4651 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4652 else
4653 l2cap_chan_ready(chan);
4654 }
4655}
4656
4657static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4658 struct hci_chan *hchan)
4659{
4660 chan->hs_hcon = hchan->conn;
4661 chan->hs_hcon->l2cap_data = chan->conn;
4662
4663 BT_DBG("move_state %d", chan->move_state);
4664
4665 switch (chan->move_state) {
4666 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4667 /* Move confirm will be sent after a success
4668 * response is received
4669 */
4670 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4671 break;
4672 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4673 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4674 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4675 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4676 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4677 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4678 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4679 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4680 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4681 }
4682 break;
4683 default:
4684 /* Move was not in expected state, free the channel */
4685 __release_logical_link(chan);
4686
4687 chan->move_state = L2CAP_MOVE_STABLE;
4688 }
4689}
4690
4691/* Call with chan locked */
27695fb4
AE		 4692void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4693 u8 status)
5b155ef9 4694{
1500109b
MM		 4695 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4696
4697 if (status) {
4698 l2cap_logical_fail(chan);
4699 __release_logical_link(chan);
4700 return;
4701 }
4702
4703 if (chan->state != BT_CONNECTED) {
4704 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4705 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4706 l2cap_logical_finish_create(chan, hchan);
4707 } else {
4708 l2cap_logical_finish_move(chan, hchan);
4709 }
5b155ef9
MM		 4710}
4711
3f7a56c4
MM		 4712void l2cap_move_start(struct l2cap_chan *chan)
4713{
4714 BT_DBG("chan %p", chan);
4715
6ed971ca 4716 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4717 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4718 return;
4719 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4720 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4721 /* Placeholder - start physical link setup */
4722 } else {
4723 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4724 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4725 chan->move_id = 0;
4726 l2cap_move_setup(chan);
4727 l2cap_send_move_chan_req(chan, 0);
4728 }
4729}
4730
8eb200bd
MM		 4731static void l2cap_do_create(struct l2cap_chan *chan, int result,
4732 u8 local_amp_id, u8 remote_amp_id)
4733{
62748ca1
AE		 4734 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4735 local_amp_id, remote_amp_id);
4736
12d6cc60
AE		 4737 chan->fcs = L2CAP_FCS_NONE;
4738
62748ca1
AE		 4739 /* Outgoing channel on AMP */
4740 if (chan->state == BT_CONNECT) {
4741 if (result == L2CAP_CR_SUCCESS) {
4742 chan->local_amp_id = local_amp_id;
4743 l2cap_send_create_chan_req(chan, remote_amp_id);
4744 } else {
4745 /* Revert to BR/EDR connect */
4746 l2cap_send_conn_req(chan);
4747 }
4748
4749 return;
4750 }
4751
4752 /* Incoming channel on AMP */
4753 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4754 struct l2cap_conn_rsp rsp;
4755 char buf[128];
4756 rsp.scid = cpu_to_le16(chan->dcid);
4757 rsp.dcid = cpu_to_le16(chan->scid);
4758
8eb200bd
MM		 4759 if (result == L2CAP_CR_SUCCESS) {
4760 /* Send successful response */
dcf4adbf
JP		 4761 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4762 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4763 } else {
4764 /* Send negative response */
dcf4adbf
JP		 4765 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4766 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4767 }
4768
4769 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4770 sizeof(rsp), &rsp);
4771
4772 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4773 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4774 set_bit(CONF_REQ_SENT, &chan->conf_state);
4775 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4776 L2CAP_CONF_REQ,
4777 l2cap_build_conf_req(chan, buf), buf);
4778 chan->num_conf_req++;
4779 }
8eb200bd
MM		 4780 }
4781}
4782
4783static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4784 u8 remote_amp_id)
4785{
4786 l2cap_move_setup(chan);
4787 chan->move_id = local_amp_id;
4788 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4789
4790 l2cap_send_move_chan_req(chan, remote_amp_id);
4791}
4792
4793static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4794{
4795 struct hci_chan *hchan = NULL;
4796
4797 /* Placeholder - get hci_chan for logical link */
4798
4799 if (hchan) {
4800 if (hchan->state == BT_CONNECTED) {
4801 /* Logical link is ready to go */
4802 chan->hs_hcon = hchan->conn;
4803 chan->hs_hcon->l2cap_data = chan->conn;
4804 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4805 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4806
4807 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4808 } else {
4809 /* Wait for logical link to be ready */
4810 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4811 }
4812 } else {
4813 /* Logical link not available */
4814 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4815 }
4816}
4817
4818static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4819{
4820 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4821 u8 rsp_result;
4822 if (result == -EINVAL)
4823 rsp_result = L2CAP_MR_BAD_ID;
4824 else
4825 rsp_result = L2CAP_MR_NOT_ALLOWED;
4826
4827 l2cap_send_move_chan_rsp(chan, rsp_result);
4828 }
4829
4830 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4831 chan->move_state = L2CAP_MOVE_STABLE;
4832
4833 /* Restart data transmission */
4834 l2cap_ertm_send(chan);
4835}
4836
a514b17f
AE		 4837/* Invoke with locked chan */
4838void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4839{
770bfefa 4840 u8 local_amp_id = chan->local_amp_id;
fffadc08 4841 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4842
8eb200bd
MM		 4843 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4844 chan, result, local_amp_id, remote_amp_id);
4845
8eb200bd
MM		 4846 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4847 l2cap_chan_unlock(chan);
4848 return;
4849 }
4850
4851 if (chan->state != BT_CONNECTED) {
4852 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4853 } else if (result != L2CAP_MR_SUCCESS) {
4854 l2cap_do_move_cancel(chan, result);
4855 } else {
4856 switch (chan->move_role) {
4857 case L2CAP_MOVE_ROLE_INITIATOR:
4858 l2cap_do_move_initiate(chan, local_amp_id,
4859 remote_amp_id);
4860 break;
4861 case L2CAP_MOVE_ROLE_RESPONDER:
4862 l2cap_do_move_respond(chan, result);
4863 break;
4864 default:
4865 l2cap_do_move_cancel(chan, result);
4866 break;
4867 }
4868 }
8eb200bd
MM		 4869}
4870
8d5a04a1 4871static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4872 struct l2cap_cmd_hdr *cmd,
4873 u16 cmd_len, void *data)
8d5a04a1
MM		 4874{
4875 struct l2cap_move_chan_req *req = data;
1500109b 4876 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4877 struct l2cap_chan *chan;
8d5a04a1
MM		 4878 u16 icid = 0;
4879 u16 result = L2CAP_MR_NOT_ALLOWED;
4880
4881 if (cmd_len != sizeof(*req))
4882 return -EPROTO;
4883
4884 icid = le16_to_cpu(req->icid);
4885
ad0ac6ca 4886 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4887
0bd49fc7 4888 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
8d5a04a1
MM		 4889 return -EINVAL;
4890
02b0fbb9
MM		 4891 chan = l2cap_get_chan_by_dcid(conn, icid);
4892 if (!chan) {
1500109b 4893 rsp.icid = cpu_to_le16(icid);
dcf4adbf 4894 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
1500109b
MM		 4895 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4896 sizeof(rsp), &rsp);
02b0fbb9
MM		 4897 return 0;
4898 }
4899
1500109b
MM		 4900 chan->ident = cmd->ident;
4901
02b0fbb9
MM		 4902 if (chan->scid < L2CAP_CID_DYN_START ||
4903 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4904 (chan->mode != L2CAP_MODE_ERTM &&
4905 chan->mode != L2CAP_MODE_STREAMING)) {
4906 result = L2CAP_MR_NOT_ALLOWED;
4907 goto send_move_response;
4908 }
4909
4910 if (chan->local_amp_id == req->dest_amp_id) {
4911 result = L2CAP_MR_SAME_ID;
4912 goto send_move_response;
4913 }
4914
6ed971ca 4915 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4916 struct hci_dev *hdev;
4917 hdev = hci_dev_get(req->dest_amp_id);
4918 if (!hdev || hdev->dev_type != HCI_AMP ||
4919 !test_bit(HCI_UP, &hdev->flags)) {
4920 if (hdev)
4921 hci_dev_put(hdev);
4922
4923 result = L2CAP_MR_BAD_ID;
4924 goto send_move_response;
4925 }
4926 hci_dev_put(hdev);
4927 }
4928
4929 /* Detect a move collision. Only send a collision response
4930 * if this side has "lost", otherwise proceed with the move.
4931 * The winner has the larger bd_addr.
4932 */
4933 if ((__chan_is_moving(chan) ||
4934 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4935 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4936 result = L2CAP_MR_COLLISION;
4937 goto send_move_response;
4938 }
4939
02b0fbb9
MM		 4940 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4941 l2cap_move_setup(chan);
4942 chan->move_id = req->dest_amp_id;
4943 icid = chan->dcid;
4944
6ed971ca 4945 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4946 /* Moving to BR/EDR */
4947 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4948 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4949 result = L2CAP_MR_PEND;
4950 } else {
4951 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4952 result = L2CAP_MR_SUCCESS;
4953 }
4954 } else {
4955 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4956 /* Placeholder - uncomment when amp functions are available */
4957 /*amp_accept_physical(chan, req->dest_amp_id);*/
4958 result = L2CAP_MR_PEND;
4959 }
4960
4961send_move_response:
1500109b 4962 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4963
02b0fbb9
MM		 4964 l2cap_chan_unlock(chan);
4965
8d5a04a1
MM		 4966 return 0;
4967}
4968
5b155ef9
MM		 4969static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4970{
4971 struct l2cap_chan *chan;
4972 struct hci_chan *hchan = NULL;
4973
4974 chan = l2cap_get_chan_by_scid(conn, icid);
4975 if (!chan) {
4976 l2cap_send_move_chan_cfm_icid(conn, icid);
4977 return;
4978 }
4979
4980 __clear_chan_timer(chan);
4981 if (result == L2CAP_MR_PEND)
4982 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4983
4984 switch (chan->move_state) {
4985 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4986 /* Move confirm will be sent when logical link
4987 * is complete.
4988 */
4989 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4990 break;
4991 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4992 if (result == L2CAP_MR_PEND) {
4993 break;
4994 } else if (test_bit(CONN_LOCAL_BUSY,
4995 &chan->conn_state)) {
4996 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4997 } else {
4998 /* Logical link is up or moving to BR/EDR,
4999 * proceed with move
5000 */
5001 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
5002 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5003 }
5004 break;
5005 case L2CAP_MOVE_WAIT_RSP:
5006 /* Moving to AMP */
5007 if (result == L2CAP_MR_SUCCESS) {
5008 /* Remote is ready, send confirm immediately
5009 * after logical link is ready
5010 */
5011 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5012 } else {
5013 /* Both logical link and move success
5014 * are required to confirm
5015 */
5016 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5017 }
5018
5019 /* Placeholder - get hci_chan for logical link */
5020 if (!hchan) {
5021 /* Logical link not available */
5022 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5023 break;
5024 }
5025
5026 /* If the logical link is not yet connected, do not
5027 * send confirmation.
5028 */
5029 if (hchan->state != BT_CONNECTED)
5030 break;
5031
5032 /* Logical link is already ready to go */
5033
5034 chan->hs_hcon = hchan->conn;
5035 chan->hs_hcon->l2cap_data = chan->conn;
5036
5037 if (result == L2CAP_MR_SUCCESS) {
5038 /* Can confirm now */
5039 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5040 } else {
5041 /* Now only need move success
5042 * to confirm
5043 */
5044 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5045 }
5046
5047 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5048 break;
5049 default:
5050 /* Any other amp move state means the move failed. */
5051 chan->move_id = chan->local_amp_id;
5052 l2cap_move_done(chan);
5053 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5054 }
5055
5056 l2cap_chan_unlock(chan);
5057}
5058
5059static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5060 u16 result)
5061{
5062 struct l2cap_chan *chan;
5063
5064 chan = l2cap_get_chan_by_ident(conn, ident);
5065 if (!chan) {
5066 /* Could not locate channel, icid is best guess */
5067 l2cap_send_move_chan_cfm_icid(conn, icid);
5068 return;
5069 }
5070
5071 __clear_chan_timer(chan);
5072
5073 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5074 if (result == L2CAP_MR_COLLISION) {
5075 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5076 } else {
5077 /* Cleanup - cancel move */
5078 chan->move_id = chan->local_amp_id;
5079 l2cap_move_done(chan);
5080 }
5081 }
5082
5083 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5084
5085 l2cap_chan_unlock(chan);
5086}
5087
5088static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5089 struct l2cap_cmd_hdr *cmd,
5090 u16 cmd_len, void *data)
8d5a04a1
MM		 5091{
5092 struct l2cap_move_chan_rsp *rsp = data;
5093 u16 icid, result;
5094
5095 if (cmd_len != sizeof(*rsp))
5096 return -EPROTO;
5097
5098 icid = le16_to_cpu(rsp->icid);
5099 result = le16_to_cpu(rsp->result);
5100
ad0ac6ca 5101 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5102
5b155ef9
MM		 5103 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5104 l2cap_move_continue(conn, icid, result);
5105 else
5106 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5107
5108 return 0;
5109}
5110
5f3847a4
MM		 5111static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5112 struct l2cap_cmd_hdr *cmd,
5113 u16 cmd_len, void *data)
8d5a04a1
MM		 5114{
5115 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5116 struct l2cap_chan *chan;
8d5a04a1
MM		 5117 u16 icid, result;
5118
5119 if (cmd_len != sizeof(*cfm))
5120 return -EPROTO;
5121
5122 icid = le16_to_cpu(cfm->icid);
5123 result = le16_to_cpu(cfm->result);
5124
ad0ac6ca 5125 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5126
5f3847a4
MM		 5127 chan = l2cap_get_chan_by_dcid(conn, icid);
5128 if (!chan) {
5129 /* Spec requires a response even if the icid was not found */
5130 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5131 return 0;
5132 }
5133
5134 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5135 if (result == L2CAP_MC_CONFIRMED) {
5136 chan->local_amp_id = chan->move_id;
6ed971ca 5137 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5138 __release_logical_link(chan);
5139 } else {
5140 chan->move_id = chan->local_amp_id;
5141 }
5142
5143 l2cap_move_done(chan);
5144 }
5145
8d5a04a1
MM		 5146 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5147
5f3847a4
MM		 5148 l2cap_chan_unlock(chan);
5149
8d5a04a1
MM		 5150 return 0;
5151}
5152
5153static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5154 struct l2cap_cmd_hdr *cmd,
5155 u16 cmd_len, void *data)
8d5a04a1
MM		 5156{
5157 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5158 struct l2cap_chan *chan;
8d5a04a1
MM		 5159 u16 icid;
5160
5161 if (cmd_len != sizeof(*rsp))
5162 return -EPROTO;
5163
5164 icid = le16_to_cpu(rsp->icid);
5165
ad0ac6ca 5166 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5167
3fd71a0a
MM		 5168 chan = l2cap_get_chan_by_scid(conn, icid);
5169 if (!chan)
5170 return 0;
5171
5172 __clear_chan_timer(chan);
5173
5174 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5175 chan->local_amp_id = chan->move_id;
5176
6ed971ca 5177 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5178 __release_logical_link(chan);
5179
5180 l2cap_move_done(chan);
5181 }
5182
5183 l2cap_chan_unlock(chan);
5184
8d5a04a1
MM		 5185 return 0;
5186}
5187
de73115a 5188static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5189 struct l2cap_cmd_hdr *cmd,
203e639e 5190 u16 cmd_len, u8 *data)
de73115a
CT		 5191{
5192 struct hci_conn *hcon = conn->hcon;
5193 struct l2cap_conn_param_update_req *req;
5194 struct l2cap_conn_param_update_rsp rsp;
203e639e 5195 u16 min, max, latency, to_multiplier;
2ce603eb 5196 int err;
de73115a 5197
40bef302 5198 if (hcon->role != HCI_ROLE_MASTER)
de73115a
CT		 5199 return -EINVAL;
5200
de73115a
CT		 5201 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5202 return -EPROTO;
5203
5204 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5205 min = __le16_to_cpu(req->min);
5206 max = __le16_to_cpu(req->max);
de73115a
CT		 5207 latency = __le16_to_cpu(req->latency);
5208 to_multiplier = __le16_to_cpu(req->to_multiplier);
5209
5210 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5211 min, max, latency, to_multiplier);
de73115a
CT		 5212
5213 memset(&rsp, 0, sizeof(rsp));
2ce603eb 5214
d4905f24 5215 err = hci_check_conn_params(min, max, latency, to_multiplier);
2ce603eb 5216 if (err)
dcf4adbf 5217 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5218 else
dcf4adbf 5219 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5220
5221 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5222 sizeof(rsp), &rsp);
de73115a 5223
ffb5a827 5224 if (!err) {
f4869e2a
JH		 5225 u8 store_hint;
5226
5227 store_hint = hci_le_conn_update(hcon, min, max, latency,
5228 to_multiplier);
ffb5a827 5229 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
f4869e2a
JH		 5230 store_hint, min, max, latency,
5231 to_multiplier);
ffb5a827 5232
ffb5a827 5233 }
2ce603eb 5234
de73115a
CT		 5235 return 0;
5236}
5237
f1496dee
JH		 5238static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5239 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5240 u8 *data)
5241{
5242 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
3e64b7bd 5243 struct hci_conn *hcon = conn->hcon;
f1496dee
JH		 5244 u16 dcid, mtu, mps, credits, result;
5245 struct l2cap_chan *chan;
3e64b7bd 5246 int err, sec_level;
f1496dee
JH		 5247
5248 if (cmd_len < sizeof(*rsp))
5249 return -EPROTO;
5250
5251 dcid = __le16_to_cpu(rsp->dcid);
5252 mtu = __le16_to_cpu(rsp->mtu);
5253 mps = __le16_to_cpu(rsp->mps);
5254 credits = __le16_to_cpu(rsp->credits);
5255 result = __le16_to_cpu(rsp->result);
5256
5257 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5258 return -EPROTO;
5259
5260 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5261 dcid, mtu, mps, credits, result);
5262
5263 mutex_lock(&conn->chan_lock);
5264
5265 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5266 if (!chan) {
5267 err = -EBADSLT;
5268 goto unlock;
5269 }
5270
5271 err = 0;
5272
5273 l2cap_chan_lock(chan);
5274
5275 switch (result) {
5276 case L2CAP_CR_SUCCESS:
5277 chan->ident = 0;
5278 chan->dcid = dcid;
5279 chan->omtu = mtu;
5280 chan->remote_mps = mps;
0cd75f7e 5281 chan->tx_credits = credits;
f1496dee
JH		 5282 l2cap_chan_ready(chan);
5283 break;
5284
3e64b7bd
JH		 5285 case L2CAP_CR_AUTHENTICATION:
5286 case L2CAP_CR_ENCRYPTION:
5287 /* If we already have MITM protection we can't do
5288 * anything.
5289 */
5290 if (hcon->sec_level > BT_SECURITY_MEDIUM) {
5291 l2cap_chan_del(chan, ECONNREFUSED);
5292 break;
5293 }
5294
5295 sec_level = hcon->sec_level + 1;
5296 if (chan->sec_level < sec_level)
5297 chan->sec_level = sec_level;
5298
5299 /* We'll need to send a new Connect Request */
5300 clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags);
5301
5302 smp_conn_security(hcon, chan->sec_level);
5303 break;
5304
f1496dee
JH		 5305 default:
5306 l2cap_chan_del(chan, ECONNREFUSED);
5307 break;
5308 }
5309
5310 l2cap_chan_unlock(chan);
5311
5312unlock:
5313 mutex_unlock(&conn->chan_lock);
5314
5315 return err;
5316}
5317
3300d9a9 5318static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5319 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5320 u8 *data)
3300d9a9
CT		 5321{
5322 int err = 0;
5323
5324 switch (cmd->code) {
5325 case L2CAP_COMMAND_REJ:
cb3b3152 5326 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5327 break;
5328
5329 case L2CAP_CONN_REQ:
cb3b3152 5330 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5331 break;
5332
5333 case L2CAP_CONN_RSP:
f5a2598d 5334 case L2CAP_CREATE_CHAN_RSP:
9245e737 5335 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5336 break;
5337
5338 case L2CAP_CONF_REQ:
5339 err = l2cap_config_req(conn, cmd, cmd_len, data);
5340 break;
5341
5342 case L2CAP_CONF_RSP:
9245e737 5343 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5344 break;
5345
5346 case L2CAP_DISCONN_REQ:
cb3b3152 5347 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5348 break;
5349
5350 case L2CAP_DISCONN_RSP:
9245e737 5351 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5352 break;
5353
5354 case L2CAP_ECHO_REQ:
5355 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5356 break;
5357
5358 case L2CAP_ECHO_RSP:
5359 break;
5360
5361 case L2CAP_INFO_REQ:
cb3b3152 5362 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5363 break;
5364
5365 case L2CAP_INFO_RSP:
9245e737 5366 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5367 break;
5368
f94ff6ff
MM		 5369 case L2CAP_CREATE_CHAN_REQ:
5370 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5371 break;
5372
8d5a04a1
MM		 5373 case L2CAP_MOVE_CHAN_REQ:
5374 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5375 break;
5376
5377 case L2CAP_MOVE_CHAN_RSP:
9245e737 5378 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5379 break;
5380
5381 case L2CAP_MOVE_CHAN_CFM:
5382 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5383 break;
5384
5385 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5386 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5387 break;
5388
3300d9a9
CT		 5389 default:
5390 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5391 err = -EINVAL;
5392 break;
5393 }
5394
5395 return err;
5396}
5397
27e2d4c8
JH		 5398static int l2cap_le_connect_req(struct l2cap_conn *conn,
5399 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5400 u8 *data)
5401{
5402 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5403 struct l2cap_le_conn_rsp rsp;
5404 struct l2cap_chan *chan, *pchan;
0cd75f7e 5405 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5406 __le16 psm;
5407 u8 result;
5408
5409 if (cmd_len != sizeof(*req))
5410 return -EPROTO;
5411
5412 scid = __le16_to_cpu(req->scid);
5413 mtu = __le16_to_cpu(req->mtu);
5414 mps = __le16_to_cpu(req->mps);
5415 psm = req->psm;
5416 dcid = 0;
0cd75f7e 5417 credits = 0;
27e2d4c8
JH		 5418
5419 if (mtu < 23 || mps < 23)
5420 return -EPROTO;
5421
5422 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5423 scid, mtu, mps);
5424
5425 /* Check if we have socket listening on psm */
5426 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5427 &conn->hcon->dst, LE_LINK);
5428 if (!pchan) {
5429 result = L2CAP_CR_BAD_PSM;
5430 chan = NULL;
5431 goto response;
5432 }
5433
5434 mutex_lock(&conn->chan_lock);
5435 l2cap_chan_lock(pchan);
5436
35dc6f83
JH		 5437 if (!smp_sufficient_security(conn->hcon, pchan->sec_level,
5438 SMP_ALLOW_STK)) {
27e2d4c8
JH		 5439 result = L2CAP_CR_AUTHENTICATION;
5440 chan = NULL;
5441 goto response_unlock;
5442 }
5443
5444 /* Check if we already have channel with that dcid */
5445 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5446 result = L2CAP_CR_NO_MEM;
5447 chan = NULL;
5448 goto response_unlock;
5449 }
5450
5451 chan = pchan->ops->new_connection(pchan);
5452 if (!chan) {
5453 result = L2CAP_CR_NO_MEM;
5454 goto response_unlock;
5455 }
5456
0ce43ce6
JH		 5457 l2cap_le_flowctl_init(chan);
5458
27e2d4c8
JH		 5459 bacpy(&chan->src, &conn->hcon->src);
5460 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 5461 chan->src_type = bdaddr_src_type(conn->hcon);
5462 chan->dst_type = bdaddr_dst_type(conn->hcon);
27e2d4c8
JH		 5463 chan->psm = psm;
5464 chan->dcid = scid;
5465 chan->omtu = mtu;
5466 chan->remote_mps = mps;
0cd75f7e 5467 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5468
5469 __l2cap_chan_add(conn, chan);
5470 dcid = chan->scid;
0cd75f7e 5471 credits = chan->rx_credits;
27e2d4c8
JH		 5472
5473 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5474
5475 chan->ident = cmd->ident;
5476
5477 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5478 l2cap_state_change(chan, BT_CONNECT2);
434714dc
JH		 5479 /* The following result value is actually not defined
5480 * for LE CoC but we use it to let the function know
5481 * that it should bail out after doing its cleanup
5482 * instead of sending a response.
5483 */
27e2d4c8
JH		 5484 result = L2CAP_CR_PEND;
5485 chan->ops->defer(chan);
5486 } else {
5487 l2cap_chan_ready(chan);
5488 result = L2CAP_CR_SUCCESS;
5489 }
5490
5491response_unlock:
5492 l2cap_chan_unlock(pchan);
5493 mutex_unlock(&conn->chan_lock);
a24cce14 5494 l2cap_chan_put(pchan);
27e2d4c8
JH		 5495
5496 if (result == L2CAP_CR_PEND)
5497 return 0;
5498
5499response:
5500 if (chan) {
5501 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5502 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5503 } else {
5504 rsp.mtu = 0;
5505 rsp.mps = 0;
5506 }
5507
5508 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5509 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5510 rsp.result = cpu_to_le16(result);
5511
5512 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5513
5514 return 0;
5515}
5516
fad5fc89
JH		 5517static inline int l2cap_le_credits(struct l2cap_conn *conn,
5518 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5519 u8 *data)
5520{
5521 struct l2cap_le_credits *pkt;
5522 struct l2cap_chan *chan;
0f1bfe4e 5523 u16 cid, credits, max_credits;
fad5fc89
JH		 5524
5525 if (cmd_len != sizeof(*pkt))
5526 return -EPROTO;
5527
5528 pkt = (struct l2cap_le_credits *) data;
5529 cid = __le16_to_cpu(pkt->cid);
5530 credits = __le16_to_cpu(pkt->credits);
5531
5532 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5533
5534 chan = l2cap_get_chan_by_dcid(conn, cid);
5535 if (!chan)
5536 return -EBADSLT;
5537
0f1bfe4e
JH		 5538 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5539 if (credits > max_credits) {
5540 BT_ERR("LE credits overflow");
5541 l2cap_send_disconn_req(chan, ECONNRESET);
ee93053d 5542 l2cap_chan_unlock(chan);
0f1bfe4e
JH		 5543
5544 /* Return 0 so that we don't trigger an unnecessary
5545 * command reject packet.
5546 */
5547 return 0;
5548 }
5549
fad5fc89
JH		 5550 chan->tx_credits += credits;
5551
5552 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5553 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5554 chan->tx_credits--;
5555 }
5556
5557 if (chan->tx_credits)
5558 chan->ops->resume(chan);
5559
5560 l2cap_chan_unlock(chan);
5561
5562 return 0;
5563}
5564
71fb4197
JH		 5565static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5566 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5567 u8 *data)
5568{
5569 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5570 struct l2cap_chan *chan;
5571
5572 if (cmd_len < sizeof(*rej))
5573 return -EPROTO;
5574
5575 mutex_lock(&conn->chan_lock);
5576
5577 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5578 if (!chan)
5579 goto done;
5580
5581 l2cap_chan_lock(chan);
5582 l2cap_chan_del(chan, ECONNREFUSED);
5583 l2cap_chan_unlock(chan);
5584
5585done:
5586 mutex_unlock(&conn->chan_lock);
5587 return 0;
5588}
5589
3300d9a9 5590static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5591 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5592 u8 *data)
3300d9a9 5593{
b5ecba64
JH		 5594 int err = 0;
5595
3300d9a9
CT		 5596 switch (cmd->code) {
5597 case L2CAP_COMMAND_REJ:
71fb4197 5598 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5599 break;
3300d9a9
CT		 5600
5601 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5602 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5603 break;
3300d9a9
CT		 5604
5605 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5606 break;
3300d9a9 5607
f1496dee
JH		 5608 case L2CAP_LE_CONN_RSP:
5609 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5610 break;
f1496dee 5611
27e2d4c8 5612 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5613 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5614 break;
27e2d4c8 5615
fad5fc89
JH		 5616 case L2CAP_LE_CREDITS:
5617 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5618 break;
5619
3defe01a 5620 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5621 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5622 break;
3defe01a
JH		 5623
5624 case L2CAP_DISCONN_RSP:
5625 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5626 break;
3defe01a 5627
3300d9a9
CT		 5628 default:
5629 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5630 err = -EINVAL;
5631 break;
3300d9a9 5632 }
b5ecba64
JH		 5633
5634 return err;
3300d9a9
CT		 5635}
5636
c5623556
JH		 5637static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5638 struct sk_buff *skb)
5639{
69c4e4e8 5640 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5641 struct l2cap_cmd_hdr *cmd;
5642 u16 len;
c5623556
JH		 5643 int err;
5644
69c4e4e8 5645 if (hcon->type != LE_LINK)
3b166295 5646 goto drop;
69c4e4e8 5647
4f3e219d
MH		 5648 if (skb->len < L2CAP_CMD_HDR_SIZE)
5649 goto drop;
c5623556 5650
4f3e219d
MH		 5651 cmd = (void *) skb->data;
5652 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5653
4f3e219d 5654 len = le16_to_cpu(cmd->len);
c5623556 5655
4f3e219d 5656 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5657
4f3e219d
MH		 5658 if (len != skb->len || !cmd->ident) {
5659 BT_DBG("corrupted command");
5660 goto drop;
5661 }
c5623556 5662
203e639e 5663 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5664 if (err) {
5665 struct l2cap_cmd_rej_unk rej;
c5623556 5666
4f3e219d 5667 BT_ERR("Wrong link type (%d)", err);
c5623556 5668
dcf4adbf 5669 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5670 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5671 sizeof(rej), &rej);
c5623556
JH		 5672 }
5673
3b166295 5674drop:
c5623556
JH		 5675 kfree_skb(skb);
5676}
5677
3300d9a9 5678static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5679 struct sk_buff *skb)
1da177e4 5680{
69c4e4e8 5681 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5682 u8 *data = skb->data;
5683 int len = skb->len;
5684 struct l2cap_cmd_hdr cmd;
3300d9a9 5685 int err;
1da177e4
LT		 5686
5687 l2cap_raw_recv(conn, skb);
5688
69c4e4e8 5689 if (hcon->type != ACL_LINK)
3b166295 5690 goto drop;
69c4e4e8 5691
1da177e4 5692 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5693 u16 cmd_len;
1da177e4
LT		 5694 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5695 data += L2CAP_CMD_HDR_SIZE;
5696 len -= L2CAP_CMD_HDR_SIZE;
5697
88219a0f 5698 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5699
2d792818
GP		 5700 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5701 cmd.ident);
1da177e4 5702
88219a0f 5703 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5704 BT_DBG("corrupted command");
5705 break;
5706 }
5707
c5623556 5708 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5709 if (err) {
e2fd318e 5710 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5711
5712 BT_ERR("Wrong link type (%d)", err);
1da177e4 5713
dcf4adbf 5714 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5715 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5716 sizeof(rej), &rej);
1da177e4
LT		 5717 }
5718
88219a0f
AV		 5719 data += cmd_len;
5720 len -= cmd_len;
1da177e4
LT		 5721 }
5722
3b166295 5723drop:
1da177e4
LT		 5724 kfree_skb(skb);
5725}
5726
47d1ec61 5727static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5728{
5729 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5730 int hdr_size;
5731
5732 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5733 hdr_size = L2CAP_EXT_HDR_SIZE;
5734 else
5735 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5736
47d1ec61 5737 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5738 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5739 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5740 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5741
5742 if (our_fcs != rcv_fcs)
7a560e5c 5743 return -EBADMSG;
fcc203c3
GP		 5744 }
5745 return 0;
5746}
5747
6ea00485 5748static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5749{
e31f7633 5750 struct l2cap_ctrl control;
d5392c8f 5751
e31f7633 5752 BT_DBG("chan %p", chan);
d5392c8f 5753
e31f7633
MM		 5754 memset(&control, 0, sizeof(control));
5755 control.sframe = 1;
5756 control.final = 1;
5757 control.reqseq = chan->buffer_seq;
5758 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5759
e2ab4353 5760 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5761 control.super = L2CAP_SUPER_RNR;
5762 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5763 }
5764
e31f7633
MM		 5765 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5766 chan->unacked_frames > 0)
5767 __set_retrans_timer(chan);
d5392c8f 5768
e31f7633 5769 /* Send pending iframes */
525cd185 5770 l2cap_ertm_send(chan);
d5392c8f 5771
e2ab4353 5772 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5773 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5774 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5775 * send it now.
5776 */
5777 control.super = L2CAP_SUPER_RR;
5778 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5779 }
5780}
5781
2d792818
GP		 5782static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5783 struct sk_buff **last_frag)
18778a63 5784{
84084a31
MM		 5785 /* skb->len reflects data in skb as well as all fragments
5786 * skb->data_len reflects only data in fragments
5787 */
5788 if (!skb_has_frag_list(skb))
5789 skb_shinfo(skb)->frag_list = new_frag;
5790
5791 new_frag->next = NULL;
5792
5793 (*last_frag)->next = new_frag;
5794 *last_frag = new_frag;
5795
5796 skb->len += new_frag->len;
5797 skb->data_len += new_frag->len;
5798 skb->truesize += new_frag->truesize;
5799}
5800
4b51dae9
MM		 5801static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5802 struct l2cap_ctrl *control)
84084a31
MM		 5803{
5804 int err = -EINVAL;
18778a63 5805
4b51dae9 5806 switch (control->sar) {
7e0ef6ee 5807 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5808 if (chan->sdu)
5809 break;
18778a63 5810
80b98027 5811 err = chan->ops->recv(chan, skb);
84084a31 5812 break;
18778a63 5813
7e0ef6ee 5814 case L2CAP_SAR_START:
84084a31
MM		 5815 if (chan->sdu)
5816 break;
18778a63 5817
6f61fd47 5818 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5819 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5820
84084a31
MM		 5821 if (chan->sdu_len > chan->imtu) {
5822 err = -EMSGSIZE;
5823 break;
5824 }
1890d36b 5825
84084a31
MM		 5826 if (skb->len >= chan->sdu_len)
5827 break;
18778a63 5828
84084a31
MM		 5829 chan->sdu = skb;
5830 chan->sdu_last_frag = skb;
18778a63 5831
84084a31
MM		 5832 skb = NULL;
5833 err = 0;
18778a63
GP		 5834 break;
5835
7e0ef6ee 5836 case L2CAP_SAR_CONTINUE:
6f61fd47 5837 if (!chan->sdu)
84084a31 5838 break;
18778a63 5839
84084a31
MM		 5840 append_skb_frag(chan->sdu, skb,
5841 &chan->sdu_last_frag);
5842 skb = NULL;
18778a63 5843
84084a31
MM		 5844 if (chan->sdu->len >= chan->sdu_len)
5845 break;
4178ba46 5846
84084a31 5847 err = 0;
18778a63
GP		 5848 break;
5849
7e0ef6ee 5850 case L2CAP_SAR_END:
6f61fd47 5851 if (!chan->sdu)
84084a31 5852 break;
18778a63 5853
84084a31
MM		 5854 append_skb_frag(chan->sdu, skb,
5855 &chan->sdu_last_frag);
5856 skb = NULL;
4178ba46 5857
84084a31
MM		 5858 if (chan->sdu->len != chan->sdu_len)
5859 break;
18778a63 5860
80b98027 5861 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5862
84084a31
MM		 5863 if (!err) {
5864 /* Reassembly complete */
5865 chan->sdu = NULL;
5866 chan->sdu_last_frag = NULL;
5867 chan->sdu_len = 0;
1890d36b 5868 }
18778a63
GP		 5869 break;
5870 }
5871
84084a31
MM		 5872 if (err) {
5873 kfree_skb(skb);
5874 kfree_skb(chan->sdu);
5875 chan->sdu = NULL;
5876 chan->sdu_last_frag = NULL;
5877 chan->sdu_len = 0;
5878 }
18778a63 5879
84084a31 5880 return err;
18778a63
GP		 5881}
5882
32b32735
MM		 5883static int l2cap_resegment(struct l2cap_chan *chan)
5884{
5885 /* Placeholder */
5886 return 0;
5887}
5888
61aa4f5b 5889void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5890{
61aa4f5b 5891 u8 event;
712132eb 5892
61aa4f5b
MM		 5893 if (chan->mode != L2CAP_MODE_ERTM)
5894 return;
712132eb 5895
61aa4f5b 5896 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5897 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5898}
5899
d2a7ac5d
MM		 5900static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5901{
63838725
MM		 5902 int err = 0;
5903 /* Pass sequential frames to l2cap_reassemble_sdu()
5904 * until a gap is encountered.
5905 */
5906
5907 BT_DBG("chan %p", chan);
5908
5909 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5910 struct sk_buff *skb;
5911 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5912 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5913
5914 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5915
5916 if (!skb)
5917 break;
5918
5919 skb_unlink(skb, &chan->srej_q);
5920 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
a4368ff3 5921 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->l2cap);
63838725
MM		 5922 if (err)
5923 break;
5924 }
5925
5926 if (skb_queue_empty(&chan->srej_q)) {
5927 chan->rx_state = L2CAP_RX_STATE_RECV;
5928 l2cap_send_ack(chan);
5929 }
5930
5931 return err;
d2a7ac5d
MM		 5932}
5933
5934static void l2cap_handle_srej(struct l2cap_chan *chan,
5935 struct l2cap_ctrl *control)
5936{
f80842a8
MM		 5937 struct sk_buff *skb;
5938
5939 BT_DBG("chan %p, control %p", chan, control);
5940
5941 if (control->reqseq == chan->next_tx_seq) {
5942 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5943 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5944 return;
5945 }
5946
5947 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5948
5949 if (skb == NULL) {
5950 BT_DBG("Seq %d not available for retransmission",
5951 control->reqseq);
5952 return;
5953 }
5954
a4368ff3 5955 if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) {
f80842a8 5956 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5957 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5958 return;
5959 }
5960
5961 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5962
5963 if (control->poll) {
5964 l2cap_pass_to_tx(chan, control);
5965
5966 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5967 l2cap_retransmit(chan, control);
5968 l2cap_ertm_send(chan);
5969
5970 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5971 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5972 chan->srej_save_reqseq = control->reqseq;
5973 }
5974 } else {
5975 l2cap_pass_to_tx_fbit(chan, control);
5976
5977 if (control->final) {
5978 if (chan->srej_save_reqseq != control->reqseq ||
5979 !test_and_clear_bit(CONN_SREJ_ACT,
5980 &chan->conn_state))
5981 l2cap_retransmit(chan, control);
5982 } else {
5983 l2cap_retransmit(chan, control);
5984 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5985 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5986 chan->srej_save_reqseq = control->reqseq;
5987 }
5988 }
5989 }
d2a7ac5d
MM		 5990}
5991
5992static void l2cap_handle_rej(struct l2cap_chan *chan,
5993 struct l2cap_ctrl *control)
5994{
fcd289df
MM		 5995 struct sk_buff *skb;
5996
5997 BT_DBG("chan %p, control %p", chan, control);
5998
5999 if (control->reqseq == chan->next_tx_seq) {
6000 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 6001 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6002 return;
6003 }
6004
6005 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
6006
6007 if (chan->max_tx && skb &&
a4368ff3 6008 bt_cb(skb)->l2cap.retries >= chan->max_tx) {
fcd289df 6009 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 6010 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6011 return;
6012 }
6013
6014 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6015
6016 l2cap_pass_to_tx(chan, control);
6017
6018 if (control->final) {
6019 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6020 l2cap_retransmit_all(chan, control);
6021 } else {
6022 l2cap_retransmit_all(chan, control);
6023 l2cap_ertm_send(chan);
6024 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6025 set_bit(CONN_REJ_ACT, &chan->conn_state);
6026 }
d2a7ac5d
MM		 6027}
6028
4b51dae9
MM		 6029static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6030{
6031 BT_DBG("chan %p, txseq %d", chan, txseq);
6032
6033 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6034 chan->expected_tx_seq);
6035
6036 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6037 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 6038 chan->tx_win) {
4b51dae9
MM		 6039 /* See notes below regarding "double poll" and
6040 * invalid packets.
6041 */
6042 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6043 BT_DBG("Invalid/Ignore - after SREJ");
6044 return L2CAP_TXSEQ_INVALID_IGNORE;
6045 } else {
6046 BT_DBG("Invalid - in window after SREJ sent");
6047 return L2CAP_TXSEQ_INVALID;
6048 }
6049 }
6050
6051 if (chan->srej_list.head == txseq) {
6052 BT_DBG("Expected SREJ");
6053 return L2CAP_TXSEQ_EXPECTED_SREJ;
6054 }
6055
6056 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6057 BT_DBG("Duplicate SREJ - txseq already stored");
6058 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6059 }
6060
6061 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6062 BT_DBG("Unexpected SREJ - not requested");
6063 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6064 }
6065 }
6066
6067 if (chan->expected_tx_seq == txseq) {
6068 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6069 chan->tx_win) {
6070 BT_DBG("Invalid - txseq outside tx window");
6071 return L2CAP_TXSEQ_INVALID;
6072 } else {
6073 BT_DBG("Expected");
6074 return L2CAP_TXSEQ_EXPECTED;
6075 }
6076 }
6077
6078 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6079 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6080 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6081 return L2CAP_TXSEQ_DUPLICATE;
6082 }
6083
6084 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6085 /* A source of invalid packets is a "double poll" condition,
6086 * where delays cause us to send multiple poll packets. If
6087 * the remote stack receives and processes both polls,
6088 * sequence numbers can wrap around in such a way that a
6089 * resent frame has a sequence number that looks like new data
6090 * with a sequence gap. This would trigger an erroneous SREJ
6091 * request.
6092 *
6093 * Fortunately, this is impossible with a tx window that's
6094 * less than half of the maximum sequence number, which allows
6095 * invalid frames to be safely ignored.
6096 *
6097 * With tx window sizes greater than half of the tx window
6098 * maximum, the frame is invalid and cannot be ignored. This
6099 * causes a disconnect.
6100 */
6101
6102 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6103 BT_DBG("Invalid/Ignore - txseq outside tx window");
6104 return L2CAP_TXSEQ_INVALID_IGNORE;
6105 } else {
6106 BT_DBG("Invalid - txseq outside tx window");
6107 return L2CAP_TXSEQ_INVALID;
6108 }
6109 } else {
6110 BT_DBG("Unexpected - txseq indicates missing frames");
6111 return L2CAP_TXSEQ_UNEXPECTED;
6112 }
6113}
6114
d2a7ac5d
MM		 6115static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6116 struct l2cap_ctrl *control,
6117 struct sk_buff *skb, u8 event)
6118{
6119 int err = 0;
941247f9 6120 bool skb_in_use = false;
d2a7ac5d
MM		 6121
6122 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6123 event);
6124
6125 switch (event) {
6126 case L2CAP_EV_RECV_IFRAME:
6127 switch (l2cap_classify_txseq(chan, control->txseq)) {
6128 case L2CAP_TXSEQ_EXPECTED:
6129 l2cap_pass_to_tx(chan, control);
6130
6131 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6132 BT_DBG("Busy, discarding expected seq %d",
6133 control->txseq);
6134 break;
6135 }
6136
6137 chan->expected_tx_seq = __next_seq(chan,
6138 control->txseq);
6139
6140 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6141 skb_in_use = true;
d2a7ac5d
MM		 6142
6143 err = l2cap_reassemble_sdu(chan, skb, control);
6144 if (err)
6145 break;
6146
6147 if (control->final) {
6148 if (!test_and_clear_bit(CONN_REJ_ACT,
6149 &chan->conn_state)) {
6150 control->final = 0;
6151 l2cap_retransmit_all(chan, control);
6152 l2cap_ertm_send(chan);
6153 }
6154 }
6155
6156 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6157 l2cap_send_ack(chan);
6158 break;
6159 case L2CAP_TXSEQ_UNEXPECTED:
6160 l2cap_pass_to_tx(chan, control);
6161
6162 /* Can't issue SREJ frames in the local busy state.
6163 * Drop this frame, it will be seen as missing
6164 * when local busy is exited.
6165 */
6166 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6167 BT_DBG("Busy, discarding unexpected seq %d",
6168 control->txseq);
6169 break;
6170 }
6171
6172 /* There was a gap in the sequence, so an SREJ
6173 * must be sent for each missing frame. The
6174 * current frame is stored for later use.
6175 */
6176 skb_queue_tail(&chan->srej_q, skb);
941247f9 6177 skb_in_use = true;
d2a7ac5d
MM		 6178 BT_DBG("Queued %p (queue len %d)", skb,
6179 skb_queue_len(&chan->srej_q));
6180
6181 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6182 l2cap_seq_list_clear(&chan->srej_list);
6183 l2cap_send_srej(chan, control->txseq);
6184
6185 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6186 break;
6187 case L2CAP_TXSEQ_DUPLICATE:
6188 l2cap_pass_to_tx(chan, control);
6189 break;
6190 case L2CAP_TXSEQ_INVALID_IGNORE:
6191 break;
6192 case L2CAP_TXSEQ_INVALID:
6193 default:
5e4e3972 6194 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6195 break;
6196 }
6197 break;
6198 case L2CAP_EV_RECV_RR:
6199 l2cap_pass_to_tx(chan, control);
6200 if (control->final) {
6201 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6202
e6a3ee6e
MM		 6203 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6204 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6205 control->final = 0;
6206 l2cap_retransmit_all(chan, control);
6207 }
6208
6209 l2cap_ertm_send(chan);
6210 } else if (control->poll) {
6211 l2cap_send_i_or_rr_or_rnr(chan);
6212 } else {
6213 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6214 &chan->conn_state) &&
6215 chan->unacked_frames)
6216 __set_retrans_timer(chan);
6217
6218 l2cap_ertm_send(chan);
6219 }
6220 break;
6221 case L2CAP_EV_RECV_RNR:
6222 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6223 l2cap_pass_to_tx(chan, control);
6224 if (control && control->poll) {
6225 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6226 l2cap_send_rr_or_rnr(chan, 0);
6227 }
6228 __clear_retrans_timer(chan);
6229 l2cap_seq_list_clear(&chan->retrans_list);
6230 break;
6231 case L2CAP_EV_RECV_REJ:
6232 l2cap_handle_rej(chan, control);
6233 break;
6234 case L2CAP_EV_RECV_SREJ:
6235 l2cap_handle_srej(chan, control);
6236 break;
6237 default:
6238 break;
6239 }
6240
6241 if (skb && !skb_in_use) {
6242 BT_DBG("Freeing %p", skb);
6243 kfree_skb(skb);
6244 }
6245
6246 return err;
6247}
6248
6249static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6250 struct l2cap_ctrl *control,
6251 struct sk_buff *skb, u8 event)
6252{
6253 int err = 0;
6254 u16 txseq = control->txseq;
941247f9 6255 bool skb_in_use = false;
d2a7ac5d
MM		 6256
6257 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6258 event);
6259
6260 switch (event) {
6261 case L2CAP_EV_RECV_IFRAME:
6262 switch (l2cap_classify_txseq(chan, txseq)) {
6263 case L2CAP_TXSEQ_EXPECTED:
6264 /* Keep frame for reassembly later */
6265 l2cap_pass_to_tx(chan, control);
6266 skb_queue_tail(&chan->srej_q, skb);
941247f9 6267 skb_in_use = true;
d2a7ac5d
MM		 6268 BT_DBG("Queued %p (queue len %d)", skb,
6269 skb_queue_len(&chan->srej_q));
6270
6271 chan->expected_tx_seq = __next_seq(chan, txseq);
6272 break;
6273 case L2CAP_TXSEQ_EXPECTED_SREJ:
6274 l2cap_seq_list_pop(&chan->srej_list);
6275
6276 l2cap_pass_to_tx(chan, control);
6277 skb_queue_tail(&chan->srej_q, skb);
941247f9 6278 skb_in_use = true;
d2a7ac5d
MM		 6279 BT_DBG("Queued %p (queue len %d)", skb,
6280 skb_queue_len(&chan->srej_q));
6281
6282 err = l2cap_rx_queued_iframes(chan);
6283 if (err)
6284 break;
6285
6286 break;
6287 case L2CAP_TXSEQ_UNEXPECTED:
6288 /* Got a frame that can't be reassembled yet.
6289 * Save it for later, and send SREJs to cover
6290 * the missing frames.
6291 */
6292 skb_queue_tail(&chan->srej_q, skb);
941247f9 6293 skb_in_use = true;
d2a7ac5d
MM		 6294 BT_DBG("Queued %p (queue len %d)", skb,
6295 skb_queue_len(&chan->srej_q));
6296
6297 l2cap_pass_to_tx(chan, control);
6298 l2cap_send_srej(chan, control->txseq);
6299 break;
6300 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6301 /* This frame was requested with an SREJ, but
6302 * some expected retransmitted frames are
6303 * missing. Request retransmission of missing
6304 * SREJ'd frames.
6305 */
6306 skb_queue_tail(&chan->srej_q, skb);
941247f9 6307 skb_in_use = true;
d2a7ac5d
MM		 6308 BT_DBG("Queued %p (queue len %d)", skb,
6309 skb_queue_len(&chan->srej_q));
6310
6311 l2cap_pass_to_tx(chan, control);
6312 l2cap_send_srej_list(chan, control->txseq);
6313 break;
6314 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6315 /* We've already queued this frame. Drop this copy. */
6316 l2cap_pass_to_tx(chan, control);
6317 break;
6318 case L2CAP_TXSEQ_DUPLICATE:
6319 /* Expecting a later sequence number, so this frame
6320 * was already received. Ignore it completely.
6321 */
6322 break;
6323 case L2CAP_TXSEQ_INVALID_IGNORE:
6324 break;
6325 case L2CAP_TXSEQ_INVALID:
6326 default:
5e4e3972 6327 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6328 break;
6329 }
6330 break;
6331 case L2CAP_EV_RECV_RR:
6332 l2cap_pass_to_tx(chan, control);
6333 if (control->final) {
6334 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6335
6336 if (!test_and_clear_bit(CONN_REJ_ACT,
6337 &chan->conn_state)) {
6338 control->final = 0;
6339 l2cap_retransmit_all(chan, control);
6340 }
6341
6342 l2cap_ertm_send(chan);
6343 } else if (control->poll) {
6344 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6345 &chan->conn_state) &&
6346 chan->unacked_frames) {
6347 __set_retrans_timer(chan);
6348 }
6349
6350 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6351 l2cap_send_srej_tail(chan);
6352 } else {
6353 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6354 &chan->conn_state) &&
6355 chan->unacked_frames)
6356 __set_retrans_timer(chan);
6357
6358 l2cap_send_ack(chan);
6359 }
6360 break;
6361 case L2CAP_EV_RECV_RNR:
6362 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6363 l2cap_pass_to_tx(chan, control);
6364 if (control->poll) {
6365 l2cap_send_srej_tail(chan);
6366 } else {
6367 struct l2cap_ctrl rr_control;
6368 memset(&rr_control, 0, sizeof(rr_control));
6369 rr_control.sframe = 1;
6370 rr_control.super = L2CAP_SUPER_RR;
6371 rr_control.reqseq = chan->buffer_seq;
6372 l2cap_send_sframe(chan, &rr_control);
6373 }
6374
6375 break;
6376 case L2CAP_EV_RECV_REJ:
6377 l2cap_handle_rej(chan, control);
6378 break;
6379 case L2CAP_EV_RECV_SREJ:
6380 l2cap_handle_srej(chan, control);
6381 break;
6382 }
6383
6384 if (skb && !skb_in_use) {
6385 BT_DBG("Freeing %p", skb);
6386 kfree_skb(skb);
6387 }
6388
6389 return err;
6390}
6391
32b32735
MM		 6392static int l2cap_finish_move(struct l2cap_chan *chan)
6393{
6394 BT_DBG("chan %p", chan);
6395
6396 chan->rx_state = L2CAP_RX_STATE_RECV;
6397
6398 if (chan->hs_hcon)
6399 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6400 else
6401 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6402
6403 return l2cap_resegment(chan);
6404}
6405
6406static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6407 struct l2cap_ctrl *control,
6408 struct sk_buff *skb, u8 event)
6409{
6410 int err;
6411
6412 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6413 event);
6414
6415 if (!control->poll)
6416 return -EPROTO;
6417
6418 l2cap_process_reqseq(chan, control->reqseq);
6419
6420 if (!skb_queue_empty(&chan->tx_q))
6421 chan->tx_send_head = skb_peek(&chan->tx_q);
6422 else
6423 chan->tx_send_head = NULL;
6424
6425 /* Rewind next_tx_seq to the point expected
6426 * by the receiver.
6427 */
6428 chan->next_tx_seq = control->reqseq;
6429 chan->unacked_frames = 0;
6430
6431 err = l2cap_finish_move(chan);
6432 if (err)
6433 return err;
6434
6435 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6436 l2cap_send_i_or_rr_or_rnr(chan);
6437
6438 if (event == L2CAP_EV_RECV_IFRAME)
6439 return -EPROTO;
6440
6441 return l2cap_rx_state_recv(chan, control, NULL, event);
6442}
6443
6444static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6445 struct l2cap_ctrl *control,
6446 struct sk_buff *skb, u8 event)
6447{
6448 int err;
6449
6450 if (!control->final)
6451 return -EPROTO;
6452
6453 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6454
6455 chan->rx_state = L2CAP_RX_STATE_RECV;
6456 l2cap_process_reqseq(chan, control->reqseq);
6457
6458 if (!skb_queue_empty(&chan->tx_q))
6459 chan->tx_send_head = skb_peek(&chan->tx_q);
6460 else
6461 chan->tx_send_head = NULL;
6462
6463 /* Rewind next_tx_seq to the point expected
6464 * by the receiver.
6465 */
6466 chan->next_tx_seq = control->reqseq;
6467 chan->unacked_frames = 0;
6468
6469 if (chan->hs_hcon)
6470 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6471 else
6472 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6473
6474 err = l2cap_resegment(chan);
6475
6476 if (!err)
6477 err = l2cap_rx_state_recv(chan, control, skb, event);
6478
6479 return err;
6480}
6481
d2a7ac5d
MM		 6482static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6483{
6484 /* Make sure reqseq is for a packet that has been sent but not acked */
6485 u16 unacked;
6486
6487 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6488 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6489}
6490
cec8ab6e
MM		 6491static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6492 struct sk_buff *skb, u8 event)
218bb9df 6493{
d2a7ac5d
MM		 6494 int err = 0;
6495
6496 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6497 control, skb, event, chan->rx_state);
6498
6499 if (__valid_reqseq(chan, control->reqseq)) {
6500 switch (chan->rx_state) {
6501 case L2CAP_RX_STATE_RECV:
6502 err = l2cap_rx_state_recv(chan, control, skb, event);
6503 break;
6504 case L2CAP_RX_STATE_SREJ_SENT:
6505 err = l2cap_rx_state_srej_sent(chan, control, skb,
6506 event);
6507 break;
32b32735
MM		 6508 case L2CAP_RX_STATE_WAIT_P:
6509 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6510 break;
6511 case L2CAP_RX_STATE_WAIT_F:
6512 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6513 break;
d2a7ac5d
MM		 6514 default:
6515 /* shut it down */
6516 break;
6517 }
6518 } else {
6519 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6520 control->reqseq, chan->next_tx_seq,
6521 chan->expected_ack_seq);
5e4e3972 6522 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6523 }
6524
6525 return err;
cec8ab6e
MM		 6526}
6527
6528static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6529 struct sk_buff *skb)
6530{
4b51dae9
MM		 6531 int err = 0;
6532
6533 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6534 chan->rx_state);
6535
6536 if (l2cap_classify_txseq(chan, control->txseq) ==
6537 L2CAP_TXSEQ_EXPECTED) {
6538 l2cap_pass_to_tx(chan, control);
6539
6540 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6541 __next_seq(chan, chan->buffer_seq));
6542
6543 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6544
6545 l2cap_reassemble_sdu(chan, skb, control);
6546 } else {
6547 if (chan->sdu) {
6548 kfree_skb(chan->sdu);
6549 chan->sdu = NULL;
6550 }
6551 chan->sdu_last_frag = NULL;
6552 chan->sdu_len = 0;
6553
6554 if (skb) {
6555 BT_DBG("Freeing %p", skb);
6556 kfree_skb(skb);
6557 }
6558 }
6559
6560 chan->last_acked_seq = control->txseq;
6561 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6562
6563 return err;
cec8ab6e
MM		 6564}
6565
6566static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6567{
a4368ff3 6568 struct l2cap_ctrl *control = &bt_cb(skb)->l2cap;
cec8ab6e
MM		 6569 u16 len;
6570 u8 event;
218bb9df 6571
b76bbd66
MM		 6572 __unpack_control(chan, skb);
6573
218bb9df
GP		 6574 len = skb->len;
6575
6576 /*
6577 * We can just drop the corrupted I-frame here.
6578 * Receiver will miss it and start proper recovery
cec8ab6e 6579 * procedures and ask for retransmission.
218bb9df 6580 */
47d1ec61 6581 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6582 goto drop;
6583
cec8ab6e 6584 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6585 len -= L2CAP_SDULEN_SIZE;
218bb9df 6586
47d1ec61 6587 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6588 len -= L2CAP_FCS_SIZE;
218bb9df 6589
47d1ec61 6590 if (len > chan->mps) {
5e4e3972 6591 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6592 goto drop;
6593 }
6594
cec8ab6e
MM		 6595 if (!control->sframe) {
6596 int err;
218bb9df 6597
cec8ab6e
MM		 6598 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6599 control->sar, control->reqseq, control->final,
6600 control->txseq);
218bb9df 6601
cec8ab6e
MM		 6602 /* Validate F-bit - F=0 always valid, F=1 only
6603 * valid in TX WAIT_F
6604 */
6605 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6606 goto drop;
cec8ab6e
MM		 6607
6608 if (chan->mode != L2CAP_MODE_STREAMING) {
6609 event = L2CAP_EV_RECV_IFRAME;
6610 err = l2cap_rx(chan, control, skb, event);
6611 } else {
6612 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6613 }
6614
cec8ab6e 6615 if (err)
5e4e3972 6616 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6617 } else {
cec8ab6e
MM		 6618 const u8 rx_func_to_event[4] = {
6619 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6620 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6621 };
6622
6623 /* Only I-frames are expected in streaming mode */
6624 if (chan->mode == L2CAP_MODE_STREAMING)
6625 goto drop;
6626
6627 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6628 control->reqseq, control->final, control->poll,
6629 control->super);
6630
218bb9df 6631 if (len != 0) {
1bb166e6 6632 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6633 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6634 goto drop;
6635 }
6636
cec8ab6e
MM		 6637 /* Validate F and P bits */
6638 if (control->final && (control->poll ||
6639 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6640 goto drop;
6641
6642 event = rx_func_to_event[control->super];
6643 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6644 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6645 }
6646
6647 return 0;
6648
6649drop:
6650 kfree_skb(skb);
6651 return 0;
6652}
6653
b1c325c2
JH		 6654static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6655{
6656 struct l2cap_conn *conn = chan->conn;
6657 struct l2cap_le_credits pkt;
6658 u16 return_credits;
6659
6660 /* We return more credits to the sender only after the amount of
6661 * credits falls below half of the initial amount.
6662 */
f15b8ecf 6663 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6664 return;
6665
f15b8ecf 6666 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6667
6668 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6669
6670 chan->rx_credits += return_credits;
6671
6672 pkt.cid = cpu_to_le16(chan->scid);
6673 pkt.credits = cpu_to_le16(return_credits);
6674
6675 chan->ident = l2cap_get_ident(conn);
6676
6677 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6678}
6679
fad5fc89
JH		 6680static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6681{
aac23bf6
JH		 6682 int err;
6683
6684 if (!chan->rx_credits) {
6685 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6686 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6687 return -ENOBUFS;
aac23bf6 6688 }
fad5fc89 6689
aac23bf6
JH		 6690 if (chan->imtu < skb->len) {
6691 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6692 return -ENOBUFS;
aac23bf6 6693 }
fad5fc89
JH		 6694
6695 chan->rx_credits--;
6696 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6697
6698 l2cap_chan_le_send_credits(chan);
6699
aac23bf6
JH		 6700 err = 0;
6701
6702 if (!chan->sdu) {
6703 u16 sdu_len;
6704
6705 sdu_len = get_unaligned_le16(skb->data);
6706 skb_pull(skb, L2CAP_SDULEN_SIZE);
6707
6708 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6709 sdu_len, skb->len, chan->imtu);
6710
6711 if (sdu_len > chan->imtu) {
6712 BT_ERR("Too big LE L2CAP SDU length received");
6713 err = -EMSGSIZE;
6714 goto failed;
6715 }
6716
6717 if (skb->len > sdu_len) {
6718 BT_ERR("Too much LE L2CAP data received");
6719 err = -EINVAL;
6720 goto failed;
6721 }
6722
6723 if (skb->len == sdu_len)
6724 return chan->ops->recv(chan, skb);
6725
6726 chan->sdu = skb;
6727 chan->sdu_len = sdu_len;
6728 chan->sdu_last_frag = skb;
6729
6730 return 0;
6731 }
6732
6733 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6734 chan->sdu->len, skb->len, chan->sdu_len);
6735
6736 if (chan->sdu->len + skb->len > chan->sdu_len) {
6737 BT_ERR("Too much LE L2CAP data received");
6738 err = -EINVAL;
6739 goto failed;
6740 }
6741
6742 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6743 skb = NULL;
6744
6745 if (chan->sdu->len == chan->sdu_len) {
6746 err = chan->ops->recv(chan, chan->sdu);
6747 if (!err) {
6748 chan->sdu = NULL;
6749 chan->sdu_last_frag = NULL;
6750 chan->sdu_len = 0;
6751 }
6752 }
6753
6754failed:
6755 if (err) {
6756 kfree_skb(skb);
6757 kfree_skb(chan->sdu);
6758 chan->sdu = NULL;
6759 chan->sdu_last_frag = NULL;
6760 chan->sdu_len = 0;
6761 }
6762
6763 /* We can't return an error here since we took care of the skb
6764 * freeing internally. An error return would cause the caller to
6765 * do a double-free of the skb.
6766 */
6767 return 0;
fad5fc89
JH		 6768}
6769
13ca56e0
AE		 6770static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6771 struct sk_buff *skb)
1da177e4 6772{
48454079 6773 struct l2cap_chan *chan;
1da177e4 6774
baa7e1fa 6775 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6776 if (!chan) {
97e8e89d
AE		 6777 if (cid == L2CAP_CID_A2MP) {
6778 chan = a2mp_channel_create(conn, skb);
6779 if (!chan) {
6780 kfree_skb(skb);
13ca56e0 6781 return;
97e8e89d
AE		 6782 }
6783
6784 l2cap_chan_lock(chan);
6785 } else {
6786 BT_DBG("unknown cid 0x%4.4x", cid);
6787 /* Drop packet and return */
6788 kfree_skb(skb);
13ca56e0 6789 return;
97e8e89d 6790 }
1da177e4
LT		 6791 }
6792
49208c9c 6793 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6794
315917e0
JH		 6795 /* If we receive data on a fixed channel before the info req/rsp
6796 * procdure is done simply assume that the channel is supported
6797 * and mark it as ready.
6798 */
6799 if (chan->chan_type == L2CAP_CHAN_FIXED)
6800 l2cap_chan_ready(chan);
6801
89bc500e 6802 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6803 goto drop;
6804
0c1bc5c6 6805 switch (chan->mode) {
38319713 6806 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6807 if (l2cap_le_data_rcv(chan, skb) < 0)
6808 goto drop;
6809
6810 goto done;
6811
1c2acffb
GP		 6812 case L2CAP_MODE_BASIC:
6813 /* If socket recv buffers overflows we drop data here
6814 * which is *bad* because L2CAP has to be reliable.
6815 * But we don't have any other choice. L2CAP doesn't
6816 * provide flow control mechanism. */
1da177e4 6817
2c96e03d
SJ		 6818 if (chan->imtu < skb->len) {
6819 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6820 goto drop;
2c96e03d 6821 }
1da177e4 6822
80b98027 6823 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6824 goto done;
6825 break;
6826
6827 case L2CAP_MODE_ERTM:
6840ed07 6828 case L2CAP_MODE_STREAMING:
cec8ab6e 6829 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6830 goto done;
6831
1c2acffb 6832 default:
0c1bc5c6 6833 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6834 break;
6835 }
1da177e4
LT		 6836
6837drop:
6838 kfree_skb(skb);
6839
6840done:
6be36555 6841 l2cap_chan_unlock(chan);
1da177e4
LT		 6842}
6843
84104b24
AE		 6844static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6845 struct sk_buff *skb)
1da177e4 6846{
ae4fd2d3 6847 struct hci_conn *hcon = conn->hcon;
23691d75 6848 struct l2cap_chan *chan;
1da177e4 6849
ae4fd2d3 6850 if (hcon->type != ACL_LINK)
a24cce14 6851 goto free_skb;
ae4fd2d3 6852
bf20fd4e
JH		 6853 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6854 ACL_LINK);
23691d75 6855 if (!chan)
a24cce14 6856 goto free_skb;
1da177e4 6857
5b4cedaa 6858 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6859
89bc500e 6860 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6861 goto drop;
6862
e13e21dc 6863 if (chan->imtu < skb->len)
1da177e4
LT		 6864 goto drop;
6865
2edf870d 6866 /* Store remote BD_ADDR and PSM for msg_name */
a4368ff3
JH		 6867 bacpy(&bt_cb(skb)->l2cap.bdaddr, &hcon->dst);
6868 bt_cb(skb)->l2cap.psm = psm;
2edf870d 6869
a24cce14
JH		 6870 if (!chan->ops->recv(chan, skb)) {
6871 l2cap_chan_put(chan);
84104b24 6872 return;
a24cce14 6873 }
1da177e4
LT		 6874
6875drop:
a24cce14
JH		 6876 l2cap_chan_put(chan);
6877free_skb:
1da177e4 6878 kfree_skb(skb);
1da177e4
LT		 6879}
6880
6881static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6882{
6883 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6884 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6885 u16 cid, len;
6886 __le16 psm;
1da177e4 6887
61a939c6
JH		 6888 if (hcon->state != BT_CONNECTED) {
6889 BT_DBG("queueing pending rx skb");
6890 skb_queue_tail(&conn->pending_rx, skb);
6891 return;
6892 }
6893
1da177e4
LT		 6894 skb_pull(skb, L2CAP_HDR_SIZE);
6895 cid = __le16_to_cpu(lh->cid);
6896 len = __le16_to_cpu(lh->len);
6897
1c2acffb
GP		 6898 if (len != skb->len) {
6899 kfree_skb(skb);
6900 return;
6901 }
6902
9e1d7e15
JH		 6903 /* Since we can't actively block incoming LE connections we must
6904 * at least ensure that we ignore incoming data from them.
6905 */
6906 if (hcon->type == LE_LINK &&
dcc36c16 6907 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
a250e048 6908 bdaddr_dst_type(hcon))) {
e493150e
JH		 6909 kfree_skb(skb);
6910 return;
6911 }
6912
1da177e4
LT		 6913 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6914
6915 switch (cid) {
8db4dc46 6916 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6917 l2cap_sig_channel(conn, skb);
6918 break;
6919
8db4dc46 6920 case L2CAP_CID_CONN_LESS:
097db76c 6921 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6922 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6923 l2cap_conless_channel(conn, psm, skb);
6924 break;
6925
a2877629
MH		 6926 case L2CAP_CID_LE_SIGNALING:
6927 l2cap_le_sig_channel(conn, skb);
6928 break;
6929
1da177e4
LT		 6930 default:
6931 l2cap_data_channel(conn, cid, skb);
6932 break;
6933 }
6934}
6935
61a939c6
JH		 6936static void process_pending_rx(struct work_struct *work)
6937{
6938 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6939 pending_rx_work);
6940 struct sk_buff *skb;
6941
6942 BT_DBG("");
6943
6944 while ((skb = skb_dequeue(&conn->pending_rx)))
6945 l2cap_recv_frame(conn, skb);
6946}
6947
162b49e7
JH		 6948static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6949{
6950 struct l2cap_conn *conn = hcon->l2cap_data;
6951 struct hci_chan *hchan;
6952
6953 if (conn)
6954 return conn;
6955
6956 hchan = hci_chan_create(hcon);
6957 if (!hchan)
6958 return NULL;
6959
27f70f3e 6960 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
162b49e7
JH		 6961 if (!conn) {
6962 hci_chan_del(hchan);
6963 return NULL;
6964 }
6965
6966 kref_init(&conn->ref);
6967 hcon->l2cap_data = conn;
51bb8457 6968 conn->hcon = hci_conn_get(hcon);
162b49e7
JH		 6969 conn->hchan = hchan;
6970
6971 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6972
6973 switch (hcon->type) {
6974 case LE_LINK:
6975 if (hcon->hdev->le_mtu) {
6976 conn->mtu = hcon->hdev->le_mtu;
6977 break;
6978 }
6979 /* fall through */
6980 default:
6981 conn->mtu = hcon->hdev->acl_mtu;
6982 break;
6983 }
6984
6985 conn->feat_mask = 0;
6986
0bd49fc7
JH		 6987 conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS;
6988
6989 if (hcon->type == ACL_LINK &&
d7a5a11d 6990 hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED))
0bd49fc7 6991 conn->local_fixed_chan |= L2CAP_FC_A2MP;
162b49e7 6992
d7a5a11d 6993 if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) &&
f9be9e86 6994 (bredr_sc_enabled(hcon->hdev) ||
b7cb93e5 6995 hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP)))
b5ae344d
JH		 6996 conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR;
6997
5a54e7c8 6998 mutex_init(&conn->ident_lock);
162b49e7
JH		 6999 mutex_init(&conn->chan_lock);
7000
7001 INIT_LIST_HEAD(&conn->chan_l);
7002 INIT_LIST_HEAD(&conn->users);
7003
276d8073 7004 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
162b49e7 7005
61a939c6
JH		 7006 skb_queue_head_init(&conn->pending_rx);
7007 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
f3d82d0c 7008 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
61a939c6 7009
162b49e7
JH		 7010 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
7011
7012 return conn;
7013}
7014
7015static bool is_valid_psm(u16 psm, u8 dst_type) {
7016 if (!psm)
7017 return false;
7018
7019 if (bdaddr_type_is_le(dst_type))
7020 return (psm <= 0x00ff);
7021
7022 /* PSM must be odd and lsb of upper byte must be 0 */
7023 return ((psm & 0x0101) == 0x0001);
7024}
7025
7026int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
7027 bdaddr_t *dst, u8 dst_type)
7028{
7029 struct l2cap_conn *conn;
7030 struct hci_conn *hcon;
7031 struct hci_dev *hdev;
162b49e7
JH		 7032 int err;
7033
7034 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7035 dst_type, __le16_to_cpu(psm));
7036
7037 hdev = hci_get_route(dst, &chan->src);
7038 if (!hdev)
7039 return -EHOSTUNREACH;
7040
7041 hci_dev_lock(hdev);
7042
162b49e7
JH		 7043 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7044 chan->chan_type != L2CAP_CHAN_RAW) {
7045 err = -EINVAL;
7046 goto done;
7047 }
7048
21626e62
JH		 7049 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7050 err = -EINVAL;
7051 goto done;
7052 }
7053
7054 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 7055 err = -EINVAL;
7056 goto done;
7057 }
7058
7059 switch (chan->mode) {
7060 case L2CAP_MODE_BASIC:
7061 break;
7062 case L2CAP_MODE_LE_FLOWCTL:
7063 l2cap_le_flowctl_init(chan);
7064 break;
7065 case L2CAP_MODE_ERTM:
7066 case L2CAP_MODE_STREAMING:
7067 if (!disable_ertm)
7068 break;
7069 /* fall through */
7070 default:
beb19e4c 7071 err = -EOPNOTSUPP;
162b49e7
JH		 7072 goto done;
7073 }
7074
7075 switch (chan->state) {
7076 case BT_CONNECT:
7077 case BT_CONNECT2:
7078 case BT_CONFIG:
7079 /* Already connecting */
7080 err = 0;
7081 goto done;
7082
7083 case BT_CONNECTED:
7084 /* Already connected */
7085 err = -EISCONN;
7086 goto done;
7087
7088 case BT_OPEN:
7089 case BT_BOUND:
7090 /* Can connect */
7091 break;
7092
7093 default:
7094 err = -EBADFD;
7095 goto done;
7096 }
7097
7098 /* Set destination address and psm */
7099 bacpy(&chan->dst, dst);
7100 chan->dst_type = dst_type;
7101
7102 chan->psm = psm;
7103 chan->dcid = cid;
7104
6f77d8c7 7105 if (bdaddr_type_is_le(dst_type)) {
e804d25d 7106 u8 role;
cdd6275e 7107
6f77d8c7
AG		 7108 /* Convert from L2CAP channel address type to HCI address type
7109 */
7110 if (dst_type == BDADDR_LE_PUBLIC)
7111 dst_type = ADDR_LE_DEV_PUBLIC;
7112 else
7113 dst_type = ADDR_LE_DEV_RANDOM;
7114
d7a5a11d 7115 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
e804d25d
JH		 7116 role = HCI_ROLE_SLAVE;
7117 else
7118 role = HCI_ROLE_MASTER;
cdd6275e 7119
04a6c589 7120 hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level,
e804d25d 7121 HCI_LE_CONN_TIMEOUT, role);
6f77d8c7 7122 } else {
d93375a8 7123 u8 auth_type = l2cap_get_auth_type(chan);
04a6c589 7124 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7125 }
162b49e7
JH		 7126
7127 if (IS_ERR(hcon)) {
7128 err = PTR_ERR(hcon);
7129 goto done;
7130 }
7131
7132 conn = l2cap_conn_add(hcon);
7133 if (!conn) {
7134 hci_conn_drop(hcon);
7135 err = -ENOMEM;
7136 goto done;
7137 }
7138
02e246ae
JH		 7139 mutex_lock(&conn->chan_lock);
7140 l2cap_chan_lock(chan);
7141
162b49e7
JH		 7142 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7143 hci_conn_drop(hcon);
7144 err = -EBUSY;
02e246ae 7145 goto chan_unlock;
162b49e7
JH		 7146 }
7147
7148 /* Update source addr of the socket */
7149 bacpy(&chan->src, &hcon->src);
a250e048 7150 chan->src_type = bdaddr_src_type(hcon);
162b49e7 7151
02e246ae 7152 __l2cap_chan_add(conn, chan);
162b49e7
JH		 7153
7154 /* l2cap_chan_add takes its own ref so we can drop this one */
7155 hci_conn_drop(hcon);
7156
7157 l2cap_state_change(chan, BT_CONNECT);
7158 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7159
61202e4d
JH		 7160 /* Release chan->sport so that it can be reused by other
7161 * sockets (as it's only used for listening sockets).
7162 */
7163 write_lock(&chan_list_lock);
7164 chan->sport = 0;
7165 write_unlock(&chan_list_lock);
7166
162b49e7
JH		 7167 if (hcon->state == BT_CONNECTED) {
7168 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7169 __clear_chan_timer(chan);
e7cafc45 7170 if (l2cap_chan_check_security(chan, true))
162b49e7
JH		 7171 l2cap_state_change(chan, BT_CONNECTED);
7172 } else
7173 l2cap_do_start(chan);
7174 }
7175
7176 err = 0;
7177
02e246ae 7178chan_unlock:
162b49e7 7179 l2cap_chan_unlock(chan);
02e246ae
JH		 7180 mutex_unlock(&conn->chan_lock);
7181done:
162b49e7
JH		 7182 hci_dev_unlock(hdev);
7183 hci_dev_put(hdev);
7184 return err;
7185}
6b8d4a6a 7186EXPORT_SYMBOL_GPL(l2cap_chan_connect);
162b49e7 7187
1da177e4
LT		 7188/* ---- L2CAP interface with lower layer (HCI) ---- */
7189
686ebf28 7190int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7191{
7192 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7193 struct l2cap_chan *c;
1da177e4 7194
6ed93dc6 7195 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7196
7197 /* Find listening sockets and check their link_mode */
23691d75
GP		 7198 read_lock(&chan_list_lock);
7199 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7200 if (c->state != BT_LISTEN)
1da177e4
LT		 7201 continue;
7202
7eafc59e 7203 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7204 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7205 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7206 lm1 |= HCI_LM_MASTER;
1da177e4 7207 exact++;
7eafc59e 7208 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7209 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7210 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7211 lm2 |= HCI_LM_MASTER;
7212 }
1da177e4 7213 }
23691d75 7214 read_unlock(&chan_list_lock);
1da177e4
LT		 7215
7216 return exact ? lm1 : lm2;
7217}
7218
e760ec12
JH		 7219/* Find the next fixed channel in BT_LISTEN state, continue iteration
7220 * from an existing channel in the list or from the beginning of the
7221 * global list (by passing NULL as first parameter).
7222 */
7223static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
327a7191 7224 struct hci_conn *hcon)
e760ec12 7225{
327a7191
JH		 7226 u8 src_type = bdaddr_src_type(hcon);
7227
e760ec12
JH		 7228 read_lock(&chan_list_lock);
7229
7230 if (c)
7231 c = list_next_entry(c, global_l);
7232 else
7233 c = list_entry(chan_list.next, typeof(*c), global_l);
7234
7235 list_for_each_entry_from(c, &chan_list, global_l) {
7236 if (c->chan_type != L2CAP_CHAN_FIXED)
7237 continue;
7238 if (c->state != BT_LISTEN)
7239 continue;
327a7191 7240 if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY))
54a1b626 7241 continue;
327a7191 7242 if (src_type != c->src_type)
54a1b626 7243 continue;
e760ec12
JH		 7244
7245 l2cap_chan_hold(c);
7246 read_unlock(&chan_list_lock);
7247 return c;
7248 }
7249
7250 read_unlock(&chan_list_lock);
7251
7252 return NULL;
7253}
7254
539c496d 7255static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7256{
e760ec12 7257 struct hci_dev *hdev = hcon->hdev;
0139418c 7258 struct l2cap_conn *conn;
e760ec12
JH		 7259 struct l2cap_chan *pchan;
7260 u8 dst_type;
0139418c 7261
539c496d
JH		 7262 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7263 return;
7264
6ed93dc6 7265 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7266
dc0f5088 7267 if (status) {
e175072f 7268 l2cap_conn_del(hcon, bt_to_errno(status));
dc0f5088 7269 return;
ba6fc317 7270 }
dc0f5088
JH		 7271
7272 conn = l2cap_conn_add(hcon);
7273 if (!conn)
7274 return;
7275
a250e048 7276 dst_type = bdaddr_dst_type(hcon);
e760ec12
JH		 7277
7278 /* If device is blocked, do not create channels for it */
7279 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7280 return;
7281
7282 /* Find fixed channels and notify them of the new connection. We
7283 * use multiple individual lookups, continuing each time where
7284 * we left off, because the list lock would prevent calling the
7285 * potentially sleeping l2cap_chan_lock() function.
7286 */
327a7191 7287 pchan = l2cap_global_fixed_chan(NULL, hcon);
e760ec12
JH		 7288 while (pchan) {
7289 struct l2cap_chan *chan, *next;
7290
7291 /* Client fixed channels should override server ones */
7292 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7293 goto next;
7294
7295 l2cap_chan_lock(pchan);
7296 chan = pchan->ops->new_connection(pchan);
7297 if (chan) {
7298 bacpy(&chan->src, &hcon->src);
7299 bacpy(&chan->dst, &hcon->dst);
a250e048 7300 chan->src_type = bdaddr_src_type(hcon);
e760ec12
JH		 7301 chan->dst_type = dst_type;
7302
7303 __l2cap_chan_add(conn, chan);
7304 }
7305
7306 l2cap_chan_unlock(pchan);
7307next:
327a7191 7308 next = l2cap_global_fixed_chan(pchan, hcon);
e760ec12
JH		 7309 l2cap_chan_put(pchan);
7310 pchan = next;
7311 }
7312
dc0f5088 7313 l2cap_conn_ready(conn);
1da177e4
LT		 7314}
7315
686ebf28 7316int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7317{
7318 struct l2cap_conn *conn = hcon->l2cap_data;
7319
7320 BT_DBG("hcon %p", hcon);
7321
686ebf28 7322 if (!conn)
9f5a0d7b 7323 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7324 return conn->disc_reason;
7325}
7326
3a6d576b 7327static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4 7328{
3a6d576b
JH		 7329 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7330 return;
7331
1da177e4
LT		 7332 BT_DBG("hcon %p reason %d", hcon, reason);
7333
e175072f 7334 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7335}
7336
4343478f 7337static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7338{
715ec005 7339 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7340 return;
7341
f62e4323 7342 if (encrypt == 0x00) {
4343478f 7343 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7344 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7345 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7346 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7347 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7348 } else {
4343478f 7349 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7350 __clear_chan_timer(chan);
f62e4323
MH		 7351 }
7352}
7353
354fe804 7354static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7355{
0139418c 7356 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7357 struct l2cap_chan *chan;
1da177e4 7358
0139418c 7359 if (!conn)
354fe804 7360 return;
0139418c 7361
89d8b407 7362 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7363
3df91ea2 7364 mutex_lock(&conn->chan_lock);
1da177e4 7365
3df91ea2 7366 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7367 l2cap_chan_lock(chan);
1da177e4 7368
89d8b407
AE		 7369 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7370 state_to_string(chan->state));
f1cb9af5 7371
2338a7e0 7372 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7373 l2cap_chan_unlock(chan);
7374 continue;
7375 }
7376
191eb398
JH		 7377 if (!status && encrypt)
7378 chan->sec_level = hcon->sec_level;
f1cb9af5 7379
96eff46e 7380 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7381 l2cap_chan_unlock(chan);
6a8d3010
MH		 7382 continue;
7383 }
7384
89bc500e 7385 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7386 chan->state == BT_CONFIG)) {
d97c899b 7387 chan->ops->resume(chan);
4343478f 7388 l2cap_check_encryption(chan, encrypt);
6be36555 7389 l2cap_chan_unlock(chan);
9719f8af
MH		 7390 continue;
7391 }
7392
89bc500e 7393 if (chan->state == BT_CONNECT) {
6d3c15da 7394 if (!status)
93c3e8f5 7395 l2cap_start_connection(chan);
6d3c15da 7396 else
ba13ccd9 7397 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
fa37c1aa
JH		 7398 } else if (chan->state == BT_CONNECT2 &&
7399 chan->mode != L2CAP_MODE_LE_FLOWCTL) {
b1235d79 7400 struct l2cap_conn_rsp rsp;
df3c3931 7401 __u16 res, stat;
1da177e4 7402
b1235d79 7403 if (!status) {
bdc25783 7404 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7405 res = L2CAP_CR_PEND;
7406 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7407 chan->ops->defer(chan);
df3c3931 7408 } else {
acdcabf5 7409 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7410 res = L2CAP_CR_SUCCESS;
7411 stat = L2CAP_CS_NO_INFO;
7412 }
b1235d79 7413 } else {
acdcabf5 7414 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7415 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7416 res = L2CAP_CR_SEC_BLOCK;
7417 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7418 }
7419
fe4128e0
GP		 7420 rsp.scid = cpu_to_le16(chan->dcid);
7421 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7422 rsp.result = cpu_to_le16(res);
7423 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7424 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7425 sizeof(rsp), &rsp);
2d369359
MM		 7426
7427 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7428 res == L2CAP_CR_SUCCESS) {
7429 char buf[128];
7430 set_bit(CONF_REQ_SENT, &chan->conf_state);
7431 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7432 L2CAP_CONF_REQ,
7433 l2cap_build_conf_req(chan, buf),
7434 buf);
7435 chan->num_conf_req++;
7436 }
b1235d79 7437 }
1da177e4 7438
6be36555 7439 l2cap_chan_unlock(chan);
1da177e4
LT		 7440 }
7441
3df91ea2 7442 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 7443}
7444
9b4c3336 7445void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7446{
7447 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7448 struct l2cap_hdr *hdr;
7449 int len;
1da177e4 7450
1d13a254
AE		 7451 /* For AMP controller do not create l2cap conn */
7452 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7453 goto drop;
1da177e4 7454
5a08ecce 7455 if (!conn)
baf43251 7456 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7457
7458 if (!conn)
1da177e4
LT		 7459 goto drop;
7460
7461 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7462
d73a0988
AE		 7463 switch (flags) {
7464 case ACL_START:
7465 case ACL_START_NO_FLUSH:
7466 case ACL_COMPLETE:
1da177e4
LT		 7467 if (conn->rx_len) {
7468 BT_ERR("Unexpected start frame (len %d)", skb->len);
7469 kfree_skb(conn->rx_skb);
7470 conn->rx_skb = NULL;
7471 conn->rx_len = 0;
7472 l2cap_conn_unreliable(conn, ECOMM);
7473 }
7474
aae7fe22
AE		 7475 /* Start fragment always begin with Basic L2CAP header */
7476 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7477 BT_ERR("Frame is too short (len %d)", skb->len);
7478 l2cap_conn_unreliable(conn, ECOMM);
7479 goto drop;
7480 }
7481
7482 hdr = (struct l2cap_hdr *) skb->data;
7483 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7484
7485 if (len == skb->len) {
7486 /* Complete frame received */
7487 l2cap_recv_frame(conn, skb);
9b4c3336 7488 return;
1da177e4
LT		 7489 }
7490
7491 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7492
7493 if (skb->len > len) {
7494 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7495 skb->len, len);
1da177e4
LT		 7496 l2cap_conn_unreliable(conn, ECOMM);
7497 goto drop;
7498 }
7499
7500 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7501 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7502 if (!conn->rx_skb)
1da177e4
LT		 7503 goto drop;
7504
d626f62b 7505 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7506 skb->len);
1da177e4 7507 conn->rx_len = len - skb->len;
d73a0988
AE		 7508 break;
7509
7510 case ACL_CONT:
1da177e4
LT		 7511 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7512
7513 if (!conn->rx_len) {
7514 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7515 l2cap_conn_unreliable(conn, ECOMM);
7516 goto drop;
7517 }
7518
7519 if (skb->len > conn->rx_len) {
7520 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7521 skb->len, conn->rx_len);
1da177e4
LT		 7522 kfree_skb(conn->rx_skb);
7523 conn->rx_skb = NULL;
7524 conn->rx_len = 0;
7525 l2cap_conn_unreliable(conn, ECOMM);
7526 goto drop;
7527 }
7528
d626f62b 7529 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7530 skb->len);
1da177e4
LT		 7531 conn->rx_len -= skb->len;
7532
7533 if (!conn->rx_len) {
c4e5bafa
JH		 7534 /* Complete frame received. l2cap_recv_frame
7535 * takes ownership of the skb so set the global
7536 * rx_skb pointer to NULL first.
7537 */
7538 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7539 conn->rx_skb = NULL;
c4e5bafa 7540 l2cap_recv_frame(conn, rx_skb);
1da177e4 7541 }
d73a0988 7542 break;
1da177e4
LT		 7543 }
7544
7545drop:
7546 kfree_skb(skb);
1da177e4
LT		 7547}
7548
354fe804
JH		 7549static struct hci_cb l2cap_cb = {
7550 .name = "L2CAP",
539c496d 7551 .connect_cfm = l2cap_connect_cfm,
3a6d576b 7552 .disconn_cfm = l2cap_disconn_cfm,
354fe804
JH		 7553 .security_cfm = l2cap_security_cfm,
7554};
7555
aef7d97c 7556static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7557{
23691d75 7558 struct l2cap_chan *c;
1da177e4 7559
333055f2 7560 read_lock(&chan_list_lock);
1da177e4 7561
23691d75 7562 list_for_each_entry(c, &chan_list, global_l) {
eeb5a067
MH		 7563 seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7564 &c->src, c->src_type, &c->dst, c->dst_type,
fcb73338
AE		 7565 c->state, __le16_to_cpu(c->psm),
7566 c->scid, c->dcid, c->imtu, c->omtu,
7567 c->sec_level, c->mode);
61e1b4b7 7568 }
1da177e4 7569
333055f2 7570 read_unlock(&chan_list_lock);
1da177e4 7571
aef7d97c 7572 return 0;
1da177e4
LT		 7573}
7574
aef7d97c
MH		 7575static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7576{
7577 return single_open(file, l2cap_debugfs_show, inode->i_private);
7578}
7579
7580static const struct file_operations l2cap_debugfs_fops = {
7581 .open = l2cap_debugfs_open,
7582 .read = seq_read,
7583 .llseek = seq_lseek,
7584 .release = single_release,
7585};
7586
7587static struct dentry *l2cap_debugfs;
1da177e4 7588
64274518 7589int __init l2cap_init(void)
1da177e4
LT		 7590{
7591 int err;
be9d1227 7592
bb58f747 7593 err = l2cap_init_sockets();
1da177e4
LT		 7594 if (err < 0)
7595 return err;
7596
354fe804
JH		 7597 hci_register_cb(&l2cap_cb);
7598
1120e4bf
MH		 7599 if (IS_ERR_OR_NULL(bt_debugfs))
7600 return 0;
7601
7602 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7603 NULL, &l2cap_debugfs_fops);
1da177e4 7604
40b9397a 7605 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
f15b8ecf 7606 &le_max_credits);
40b9397a 7607 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
f15b8ecf
JH		 7608 &le_default_mps);
7609
1da177e4 7610 return 0;
1da177e4
LT		 7611}
7612
64274518 7613void l2cap_exit(void)
1da177e4 7614{
aef7d97c 7615 debugfs_remove(l2cap_debugfs);
354fe804 7616 hci_unregister_cb(&l2cap_cb);
bb58f747 7617 l2cap_cleanup_sockets();
1da177e4
LT		 7618}
7619
d1c4a17d
GP		 7620module_param(disable_ertm, bool, 0644);
7621MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
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