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Bluetooth: L2CAP: Fix checked range when allocating new CID
[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
ab0c127f 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
835a6a2f 1604 if (!list_empty(&user->list)) {
2c8e1411
DH		 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
835a6a2f 1634 if (list_empty(&user->list))
2c8e1411
DH		 1635 goto out_unlock;
1636
ab944c83 1637 list_del_init(&user->list);
2c8e1411
DH		 1638 user->remove(conn, user);
1639
1640out_unlock:
1641 hci_dev_unlock(hdev);
1642}
1643EXPORT_SYMBOL(l2cap_unregister_user);
1644
1645static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1646{
1647 struct l2cap_user *user;
1648
1649 while (!list_empty(&conn->users)) {
1650 user = list_first_entry(&conn->users, struct l2cap_user, list);
ab944c83 1651 list_del_init(&user->list);
2c8e1411
DH		 1652 user->remove(conn, user);
1653 }
1654}
1655
5d3de7df
VCG		 1656static void l2cap_conn_del(struct hci_conn *hcon, int err)
1657{
1658 struct l2cap_conn *conn = hcon->l2cap_data;
1659 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1660
1661 if (!conn)
1662 return;
1663
1664 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1665
1666 kfree_skb(conn->rx_skb);
1667
61a939c6 1668 skb_queue_purge(&conn->pending_rx);
7ab56c3a
JT		 1669
1670 /* We can not call flush_work(&conn->pending_rx_work) here since we
1671 * might block if we are running on a worker from the same workqueue
1672 * pending_rx_work is waiting on.
1673 */
1674 if (work_pending(&conn->pending_rx_work))
1675 cancel_work_sync(&conn->pending_rx_work);
61a939c6 1676
f3d82d0c
JH		 1677 if (work_pending(&conn->id_addr_update_work))
1678 cancel_work_sync(&conn->id_addr_update_work);
1679
2c8e1411
DH		 1680 l2cap_unregister_all_users(conn);
1681
e31fb860
JH		 1682 /* Force the connection to be immediately dropped */
1683 hcon->disc_timeout = 0;
1684
3df91ea2
AE		 1685 mutex_lock(&conn->chan_lock);
1686
5d3de7df
VCG		 1687 /* Kill channels */
1688 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1689 l2cap_chan_hold(chan);
6be36555
AE		 1690 l2cap_chan_lock(chan);
1691
5d3de7df 1692 l2cap_chan_del(chan, err);
6be36555
AE		 1693
1694 l2cap_chan_unlock(chan);
1695
80b98027 1696 chan->ops->close(chan);
61d6ef3e 1697 l2cap_chan_put(chan);
5d3de7df
VCG		 1698 }
1699
3df91ea2
AE		 1700 mutex_unlock(&conn->chan_lock);
1701
73d80deb
LAD		 1702 hci_chan_del(conn->hchan);
1703
5d3de7df 1704 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1705 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1706
5d3de7df 1707 hcon->l2cap_data = NULL;
9c903e37
DH		 1708 conn->hchan = NULL;
1709 l2cap_conn_put(conn);
5d3de7df
VCG		 1710}
1711
9c903e37
DH		 1712static void l2cap_conn_free(struct kref *ref)
1713{
1714 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1715
1716 hci_conn_put(conn->hcon);
1717 kfree(conn);
1718}
1719
51bb8457 1720struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
9c903e37
DH		 1721{
1722 kref_get(&conn->ref);
51bb8457 1723 return conn;
9c903e37
DH		 1724}
1725EXPORT_SYMBOL(l2cap_conn_get);
1726
1727void l2cap_conn_put(struct l2cap_conn *conn)
1728{
1729 kref_put(&conn->ref, l2cap_conn_free);
1730}
1731EXPORT_SYMBOL(l2cap_conn_put);
1732
1da177e4 1733/* ---- Socket interface ---- */
1da177e4 1734
c2287681 1735/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1736 * Returns closest match.
1737 */
c2287681
IY		 1738static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1739 bdaddr_t *src,
bf20fd4e
JH		 1740 bdaddr_t *dst,
1741 u8 link_type)
1da177e4 1742{
23691d75 1743 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1744
23691d75 1745 read_lock(&chan_list_lock);
e0f0cb56 1746
23691d75 1747 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1748 if (state && c->state != state)
1da177e4
LT		 1749 continue;
1750
bf20fd4e
JH		 1751 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1752 continue;
1753
1754 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1755 continue;
1756
23691d75 1757 if (c->psm == psm) {
c2287681
IY		 1758 int src_match, dst_match;
1759 int src_any, dst_any;
1760
1da177e4 1761 /* Exact match. */
7eafc59e
MH		 1762 src_match = !bacmp(&c->src, src);
1763 dst_match = !bacmp(&c->dst, dst);
c2287681 1764 if (src_match && dst_match) {
a24cce14 1765 l2cap_chan_hold(c);
a7567b20 1766 read_unlock(&chan_list_lock);
23691d75
GP		 1767 return c;
1768 }
1da177e4
LT		 1769
1770 /* Closest match */
7eafc59e
MH		 1771 src_any = !bacmp(&c->src, BDADDR_ANY);
1772 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1773 if ((src_match && dst_any) || (src_any && dst_match) ||
1774 (src_any && dst_any))
23691d75 1775 c1 = c;
1da177e4
LT		 1776 }
1777 }
1da177e4 1778
a24cce14
JH		 1779 if (c1)
1780 l2cap_chan_hold(c1);
1781
23691d75 1782 read_unlock(&chan_list_lock);
e0f0cb56 1783
23691d75 1784 return c1;
1da177e4
LT		 1785}
1786
721c4181 1787static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1788{
721c4181 1789 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1790 monitor_timer.work);
e90bac06 1791
525cd185 1792 BT_DBG("chan %p", chan);
0e98958d 1793
6be36555
AE		 1794 l2cap_chan_lock(chan);
1795
80909e04 1796 if (!chan->conn) {
6be36555 1797 l2cap_chan_unlock(chan);
8d7e1c7f 1798 l2cap_chan_put(chan);
e90bac06
GP		 1799 return;
1800 }
1801
401bb1f7 1802 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1803
6be36555 1804 l2cap_chan_unlock(chan);
8d7e1c7f 1805 l2cap_chan_put(chan);
e90bac06
GP		 1806}
1807
721c4181 1808static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1809{
721c4181 1810 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1811 retrans_timer.work);
e90bac06 1812
49208c9c 1813 BT_DBG("chan %p", chan);
0e98958d 1814
6be36555
AE		 1815 l2cap_chan_lock(chan);
1816
80909e04
MM		 1817 if (!chan->conn) {
1818 l2cap_chan_unlock(chan);
1819 l2cap_chan_put(chan);
1820 return;
1821 }
6be36555 1822
401bb1f7 1823 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1824 l2cap_chan_unlock(chan);
8d7e1c7f 1825 l2cap_chan_put(chan);
e90bac06
GP		 1826}
1827
d660366d
GP		 1828static void l2cap_streaming_send(struct l2cap_chan *chan,
1829 struct sk_buff_head *skbs)
6840ed07 1830{
ccbb84af 1831 struct sk_buff *skb;
3733937d 1832 struct l2cap_ctrl *control;
6840ed07 1833
3733937d
MM		 1834 BT_DBG("chan %p, skbs %p", chan, skbs);
1835
b99e13ad
MM		 1836 if (__chan_is_moving(chan))
1837 return;
1838
3733937d
MM		 1839 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1840
1841 while (!skb_queue_empty(&chan->tx_q)) {
1842
1843 skb = skb_dequeue(&chan->tx_q);
1844
a4368ff3
JH		 1845 bt_cb(skb)->l2cap.retries = 1;
1846 control = &bt_cb(skb)->l2cap;
3733937d
MM		 1847
1848 control->reqseq = 0;
1849 control->txseq = chan->next_tx_seq;
1850
1851 __pack_control(chan, control, skb);
6840ed07 1852
47d1ec61 1853 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1854 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1855 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1856 }
1857
4343478f 1858 l2cap_do_send(chan, skb);
6840ed07 1859
b4400672 1860 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1861
836be934 1862 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1863 chan->frames_sent++;
6840ed07 1864 }
6840ed07
GP		 1865}
1866
67c9e840 1867static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1868{
1869 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1870 struct l2cap_ctrl *control;
1871 int sent = 0;
1872
1873 BT_DBG("chan %p", chan);
1c2acffb 1874
89bc500e 1875 if (chan->state != BT_CONNECTED)
c13ffa62 1876 return -ENOTCONN;
e90bac06 1877
94122bbe
MM		 1878 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1879 return 0;
1880
b99e13ad
MM		 1881 if (__chan_is_moving(chan))
1882 return 0;
1883
18a48e76
MM		 1884 while (chan->tx_send_head &&
1885 chan->unacked_frames < chan->remote_tx_win &&
1886 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1887
18a48e76 1888 skb = chan->tx_send_head;
e90bac06 1889
a4368ff3
JH		 1890 bt_cb(skb)->l2cap.retries = 1;
1891 control = &bt_cb(skb)->l2cap;
95ffa978 1892
e2ab4353 1893 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1894 control->final = 1;
e2ab4353 1895
18a48e76
MM		 1896 control->reqseq = chan->buffer_seq;
1897 chan->last_acked_seq = chan->buffer_seq;
1898 control->txseq = chan->next_tx_seq;
1c2acffb 1899
18a48e76 1900 __pack_control(chan, control, skb);
e90bac06 1901
47d1ec61 1902 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1903 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1904 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1905 }
1906
18a48e76
MM		 1907 /* Clone after data has been modified. Data is assumed to be
1908 read-only (for locking purposes) on cloned sk_buffs.
1909 */
1910 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1911
18a48e76
MM		 1912 if (!tx_skb)
1913 break;
1c2acffb 1914
18a48e76 1915 __set_retrans_timer(chan);
836be934
AE		 1916
1917 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1918 chan->unacked_frames++;
6a026610 1919 chan->frames_sent++;
18a48e76 1920 sent++;
1c2acffb 1921
58d35f87
GP		 1922 if (skb_queue_is_last(&chan->tx_q, skb))
1923 chan->tx_send_head = NULL;
1c2acffb 1924 else
58d35f87 1925 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1926
1927 l2cap_do_send(chan, tx_skb);
b4400672 1928 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1929 }
1930
b4400672
AE		 1931 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1932 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1933
1934 return sent;
9e917af1
GP		 1935}
1936
e1fbd4c1
MM		 1937static void l2cap_ertm_resend(struct l2cap_chan *chan)
1938{
1939 struct l2cap_ctrl control;
1940 struct sk_buff *skb;
1941 struct sk_buff *tx_skb;
1942 u16 seq;
1943
1944 BT_DBG("chan %p", chan);
1945
1946 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1947 return;
1948
b99e13ad
MM		 1949 if (__chan_is_moving(chan))
1950 return;
1951
e1fbd4c1
MM		 1952 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1953 seq = l2cap_seq_list_pop(&chan->retrans_list);
1954
1955 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1956 if (!skb) {
1957 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1958 seq);
e1fbd4c1
MM		 1959 continue;
1960 }
1961
a4368ff3
JH		 1962 bt_cb(skb)->l2cap.retries++;
1963 control = bt_cb(skb)->l2cap;
e1fbd4c1
MM		 1964
1965 if (chan->max_tx != 0 &&
a4368ff3 1966 bt_cb(skb)->l2cap.retries > chan->max_tx) {
e1fbd4c1 1967 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1968 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1969 l2cap_seq_list_clear(&chan->retrans_list);
1970 break;
1971 }
1972
1973 control.reqseq = chan->buffer_seq;
1974 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1975 control.final = 1;
1976 else
1977 control.final = 0;
1978
1979 if (skb_cloned(skb)) {
1980 /* Cloned sk_buffs are read-only, so we need a
1981 * writeable copy
1982 */
8bcde1f2 1983 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1984 } else {
8bcde1f2 1985 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1986 }
1987
1988 if (!tx_skb) {
1989 l2cap_seq_list_clear(&chan->retrans_list);
1990 break;
1991 }
1992
1993 /* Update skb contents */
1994 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1995 put_unaligned_le32(__pack_extended_control(&control),
1996 tx_skb->data + L2CAP_HDR_SIZE);
1997 } else {
1998 put_unaligned_le16(__pack_enhanced_control(&control),
1999 tx_skb->data + L2CAP_HDR_SIZE);
2000 }
2001
13cac152 2002 /* Update FCS */
e1fbd4c1 2003 if (chan->fcs == L2CAP_FCS_CRC16) {
13cac152
LR		 2004 u16 fcs = crc16(0, (u8 *) tx_skb->data,
2005 tx_skb->len - L2CAP_FCS_SIZE);
2006 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
2007 L2CAP_FCS_SIZE);
e1fbd4c1
MM		 2008 }
2009
2010 l2cap_do_send(chan, tx_skb);
2011
2012 BT_DBG("Resent txseq %d", control.txseq);
2013
2014 chan->last_acked_seq = chan->buffer_seq;
2015 }
2016}
2017
f80842a8
MM		 2018static void l2cap_retransmit(struct l2cap_chan *chan,
2019 struct l2cap_ctrl *control)
2020{
2021 BT_DBG("chan %p, control %p", chan, control);
2022
2023 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2024 l2cap_ertm_resend(chan);
2025}
2026
d2a7ac5d
MM		 2027static void l2cap_retransmit_all(struct l2cap_chan *chan,
2028 struct l2cap_ctrl *control)
2029{
e1fbd4c1
MM		 2030 struct sk_buff *skb;
2031
2032 BT_DBG("chan %p, control %p", chan, control);
2033
2034 if (control->poll)
2035 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2036
2037 l2cap_seq_list_clear(&chan->retrans_list);
2038
2039 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2040 return;
2041
2042 if (chan->unacked_frames) {
2043 skb_queue_walk(&chan->tx_q, skb) {
a4368ff3 2044 if (bt_cb(skb)->l2cap.txseq == control->reqseq ||
2d792818 2045 skb == chan->tx_send_head)
e1fbd4c1
MM		 2046 break;
2047 }
2048
2049 skb_queue_walk_from(&chan->tx_q, skb) {
2050 if (skb == chan->tx_send_head)
2051 break;
2052
2053 l2cap_seq_list_append(&chan->retrans_list,
a4368ff3 2054 bt_cb(skb)->l2cap.txseq);
e1fbd4c1
MM		 2055 }
2056
2057 l2cap_ertm_resend(chan);
2058 }
d2a7ac5d
MM		 2059}
2060
0a0aba42 2061static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2062{
0a0aba42
MM		 2063 struct l2cap_ctrl control;
2064 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2065 chan->last_acked_seq);
2066 int threshold;
9e917af1 2067
0a0aba42
MM		 2068 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2069 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2070
0a0aba42
MM		 2071 memset(&control, 0, sizeof(control));
2072 control.sframe = 1;
dfc909be 2073
0a0aba42
MM		 2074 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2075 chan->rx_state == L2CAP_RX_STATE_RECV) {
2076 __clear_ack_timer(chan);
2077 control.super = L2CAP_SUPER_RNR;
2078 control.reqseq = chan->buffer_seq;
2079 l2cap_send_sframe(chan, &control);
2080 } else {
2081 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2082 l2cap_ertm_send(chan);
2083 /* If any i-frames were sent, they included an ack */
2084 if (chan->buffer_seq == chan->last_acked_seq)
2085 frames_to_ack = 0;
2086 }
dfc909be 2087
c20f8e35 2088 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2089 * Calculate without mul or div
2090 */
c20f8e35 2091 threshold = chan->ack_win;
0a0aba42
MM		 2092 threshold += threshold << 1;
2093 threshold >>= 2;
2094
b4400672 2095 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2096 threshold);
2097
2098 if (frames_to_ack >= threshold) {
2099 __clear_ack_timer(chan);
2100 control.super = L2CAP_SUPER_RR;
2101 control.reqseq = chan->buffer_seq;
2102 l2cap_send_sframe(chan, &control);
2103 frames_to_ack = 0;
2104 }
1c2acffb 2105
0a0aba42
MM		 2106 if (frames_to_ack)
2107 __set_ack_timer(chan);
2108 }
b17e73bb
SJ		 2109}
2110
04124681
GP		 2111static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2112 struct msghdr *msg, int len,
2113 int count, struct sk_buff *skb)
1c2acffb 2114{
0952a57a 2115 struct l2cap_conn *conn = chan->conn;
1c2acffb 2116 struct sk_buff **frag;
90338947 2117 int sent = 0;
1da177e4 2118
17836394 2119 if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count)
1c2acffb 2120 return -EFAULT;
1da177e4
LT		 2121
2122 sent += count;
2123 len -= count;
2124
2125 /* Continuation fragments (no L2CAP header) */
2126 frag = &skb_shinfo(skb)->frag_list;
2127 while (len) {
fbe00700
GP		 2128 struct sk_buff *tmp;
2129
1da177e4
LT		 2130 count = min_t(unsigned int, conn->mtu, len);
2131
d9fbd02b 2132 tmp = chan->ops->alloc_skb(chan, 0, count,
fbe00700
GP		 2133 msg->msg_flags & MSG_DONTWAIT);
2134 if (IS_ERR(tmp))
2135 return PTR_ERR(tmp);
2136
2137 *frag = tmp;
2f7719ce 2138
17836394
AV		 2139 if (copy_from_iter(skb_put(*frag, count), count,
2140 &msg->msg_iter) != count)
1c2acffb 2141 return -EFAULT;
1da177e4
LT		 2142
2143 sent += count;
2144 len -= count;
2145
2d0ed3d5
GP		 2146 skb->len += (*frag)->len;
2147 skb->data_len += (*frag)->len;
2148
1da177e4
LT		 2149 frag = &(*frag)->next;
2150 }
1da177e4
LT		 2151
2152 return sent;
1c2acffb 2153}
1da177e4 2154
5e59b791 2155static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
8d46321c 2156 struct msghdr *msg, size_t len)
1c2acffb 2157{
8c1d787b 2158 struct l2cap_conn *conn = chan->conn;
1c2acffb 2159 struct sk_buff *skb;
03a51213 2160 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2161 struct l2cap_hdr *lh;
2162
8d46321c
MH		 2163 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2164 __le16_to_cpu(chan->psm), len);
1c2acffb
GP		 2165
2166 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2167
d9fbd02b 2168 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2169 msg->msg_flags & MSG_DONTWAIT);
2170 if (IS_ERR(skb))
2171 return skb;
1c2acffb
GP		 2172
2173 /* Create L2CAP header */
2174 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2175 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2176 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2177 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2178
0952a57a 2179 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2180 if (unlikely(err < 0)) {
2181 kfree_skb(skb);
2182 return ERR_PTR(err);
2183 }
2184 return skb;
2185}
2186
5e59b791 2187static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
8d46321c 2188 struct msghdr *msg, size_t len)
1c2acffb 2189{
8c1d787b 2190 struct l2cap_conn *conn = chan->conn;
1c2acffb 2191 struct sk_buff *skb;
f2ba7fae 2192 int err, count;
1c2acffb
GP		 2193 struct l2cap_hdr *lh;
2194
b4400672 2195 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2196
f2ba7fae 2197 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2198
d9fbd02b 2199 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
90338947
GP		 2200 msg->msg_flags & MSG_DONTWAIT);
2201 if (IS_ERR(skb))
2202 return skb;
1c2acffb
GP		 2203
2204 /* Create L2CAP header */
2205 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2206 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2207 lh->len = cpu_to_le16(len);
1c2acffb 2208
0952a57a 2209 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2210 if (unlikely(err < 0)) {
2211 kfree_skb(skb);
2212 return ERR_PTR(err);
2213 }
2214 return skb;
2215}
2216
ab0ff76d 2217static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2218 struct msghdr *msg, size_t len,
2219 u16 sdulen)
1c2acffb 2220{
8c1d787b 2221 struct l2cap_conn *conn = chan->conn;
1c2acffb 2222 struct sk_buff *skb;
e4ca6d98 2223 int err, count, hlen;
1c2acffb
GP		 2224 struct l2cap_hdr *lh;
2225
b4400672 2226 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2227
0ee0d208
GP		 2228 if (!conn)
2229 return ERR_PTR(-ENOTCONN);
2230
ba7aa64f 2231 hlen = __ertm_hdr_size(chan);
e4ca6d98 2232
c74e560c 2233 if (sdulen)
03a51213 2234 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2235
47d1ec61 2236 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2237 hlen += L2CAP_FCS_SIZE;
fcc203c3 2238
1c2acffb 2239 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2240
d9fbd02b 2241 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2242 msg->msg_flags & MSG_DONTWAIT);
2243 if (IS_ERR(skb))
2244 return skb;
1c2acffb
GP		 2245
2246 /* Create L2CAP header */
2247 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2248 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2249 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2250
18a48e76
MM		 2251 /* Control header is populated later */
2252 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2253 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2254 else
2255 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2256
c74e560c 2257 if (sdulen)
03a51213 2258 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2259
0952a57a 2260 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2261 if (unlikely(err < 0)) {
2262 kfree_skb(skb);
2263 return ERR_PTR(err);
2264 }
e90bac06 2265
a4368ff3
JH		 2266 bt_cb(skb)->l2cap.fcs = chan->fcs;
2267 bt_cb(skb)->l2cap.retries = 0;
1c2acffb 2268 return skb;
1da177e4
LT		 2269}
2270
94122bbe
MM		 2271static int l2cap_segment_sdu(struct l2cap_chan *chan,
2272 struct sk_buff_head *seg_queue,
2273 struct msghdr *msg, size_t len)
c74e560c 2274{
c74e560c 2275 struct sk_buff *skb;
94122bbe
MM		 2276 u16 sdu_len;
2277 size_t pdu_len;
94122bbe 2278 u8 sar;
c74e560c 2279
b4400672 2280 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2281
94122bbe
MM		 2282 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2283 * so fragmented skbs are not used. The HCI layer's handling
2284 * of fragmented skbs is not compatible with ERTM's queueing.
2285 */
c74e560c 2286
94122bbe
MM		 2287 /* PDU size is derived from the HCI MTU */
2288 pdu_len = chan->conn->mtu;
c74e560c 2289
a549574d
MM		 2290 /* Constrain PDU size for BR/EDR connections */
2291 if (!chan->hs_hcon)
2292 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2293
2294 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2295 if (chan->fcs)
2296 pdu_len -= L2CAP_FCS_SIZE;
2297
ba7aa64f 2298 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2299
2300 /* Remote device may have requested smaller PDUs */
2301 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2302
2303 if (len <= pdu_len) {
2304 sar = L2CAP_SAR_UNSEGMENTED;
2305 sdu_len = 0;
2306 pdu_len = len;
2307 } else {
2308 sar = L2CAP_SAR_START;
2309 sdu_len = len;
94122bbe
MM		 2310 }
2311
2312 while (len > 0) {
2313 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2314
c74e560c 2315 if (IS_ERR(skb)) {
94122bbe 2316 __skb_queue_purge(seg_queue);
c74e560c
GP		 2317 return PTR_ERR(skb);
2318 }
2319
a4368ff3 2320 bt_cb(skb)->l2cap.sar = sar;
94122bbe
MM		 2321 __skb_queue_tail(seg_queue, skb);
2322
2323 len -= pdu_len;
069cb270 2324 if (sdu_len)
94122bbe 2325 sdu_len = 0;
94122bbe
MM		 2326
2327 if (len <= pdu_len) {
2328 sar = L2CAP_SAR_END;
2329 pdu_len = len;
2330 } else {
2331 sar = L2CAP_SAR_CONTINUE;
2332 }
c74e560c 2333 }
c74e560c 2334
f0f62799 2335 return 0;
c74e560c
GP		 2336}
2337
177f8f2b
JH		 2338static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2339 struct msghdr *msg,
2340 size_t len, u16 sdulen)
2341{
2342 struct l2cap_conn *conn = chan->conn;
2343 struct sk_buff *skb;
2344 int err, count, hlen;
2345 struct l2cap_hdr *lh;
2346
2347 BT_DBG("chan %p len %zu", chan, len);
2348
2349 if (!conn)
2350 return ERR_PTR(-ENOTCONN);
2351
2352 hlen = L2CAP_HDR_SIZE;
2353
2354 if (sdulen)
2355 hlen += L2CAP_SDULEN_SIZE;
2356
2357 count = min_t(unsigned int, (conn->mtu - hlen), len);
2358
d9fbd02b 2359 skb = chan->ops->alloc_skb(chan, hlen, count,
177f8f2b
JH		 2360 msg->msg_flags & MSG_DONTWAIT);
2361 if (IS_ERR(skb))
2362 return skb;
2363
2364 /* Create L2CAP header */
2365 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2366 lh->cid = cpu_to_le16(chan->dcid);
2367 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2368
2369 if (sdulen)
2370 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2371
2372 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2373 if (unlikely(err < 0)) {
2374 kfree_skb(skb);
2375 return ERR_PTR(err);
2376 }
2377
2378 return skb;
2379}
2380
2381static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2382 struct sk_buff_head *seg_queue,
2383 struct msghdr *msg, size_t len)
2384{
2385 struct sk_buff *skb;
2386 size_t pdu_len;
2387 u16 sdu_len;
2388
2389 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2390
177f8f2b 2391 sdu_len = len;
72c6fb91 2392 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
177f8f2b
JH		 2393
2394 while (len > 0) {
2395 if (len <= pdu_len)
2396 pdu_len = len;
2397
2398 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2399 if (IS_ERR(skb)) {
2400 __skb_queue_purge(seg_queue);
2401 return PTR_ERR(skb);
2402 }
2403
2404 __skb_queue_tail(seg_queue, skb);
2405
2406 len -= pdu_len;
2407
2408 if (sdu_len) {
2409 sdu_len = 0;
2410 pdu_len += L2CAP_SDULEN_SIZE;
2411 }
2412 }
2413
2414 return 0;
2415}
2416
8d46321c 2417int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
9a91a04a 2418{
9a91a04a 2419 struct sk_buff *skb;
9a91a04a 2420 int err;
94122bbe 2421 struct sk_buff_head seg_queue;
9a91a04a 2422
31e8ce80
SWK		 2423 if (!chan->conn)
2424 return -ENOTCONN;
2425
9a91a04a 2426 /* Connectionless channel */
715ec005 2427 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
8d46321c 2428 skb = l2cap_create_connless_pdu(chan, msg, len);
9a91a04a
GP		 2429 if (IS_ERR(skb))
2430 return PTR_ERR(skb);
2431
ede81a2a
AK		 2432 /* Channel lock is released before requesting new skb and then
2433 * reacquired thus we need to recheck channel state.
2434 */
2435 if (chan->state != BT_CONNECTED) {
2436 kfree_skb(skb);
2437 return -ENOTCONN;
2438 }
2439
9a91a04a
GP		 2440 l2cap_do_send(chan, skb);
2441 return len;
2442 }
2443
2444 switch (chan->mode) {
38319713 2445 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2446 /* Check outgoing MTU */
2447 if (len > chan->omtu)
2448 return -EMSGSIZE;
2449
fad5fc89
JH		 2450 if (!chan->tx_credits)
2451 return -EAGAIN;
2452
177f8f2b
JH		 2453 __skb_queue_head_init(&seg_queue);
2454
2455 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2456
2457 if (chan->state != BT_CONNECTED) {
2458 __skb_queue_purge(&seg_queue);
2459 err = -ENOTCONN;
2460 }
2461
2462 if (err)
2463 return err;
2464
2465 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2466
2467 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2468 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2469 chan->tx_credits--;
2470 }
2471
2472 if (!chan->tx_credits)
2473 chan->ops->suspend(chan);
2474
2475 err = len;
2476
2477 break;
2478
fad5fc89 2479 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2480 /* Check outgoing MTU */
2481 if (len > chan->omtu)
2482 return -EMSGSIZE;
2483
2484 /* Create a basic PDU */
8d46321c 2485 skb = l2cap_create_basic_pdu(chan, msg, len);
9a91a04a
GP		 2486 if (IS_ERR(skb))
2487 return PTR_ERR(skb);
2488
ede81a2a
AK		 2489 /* Channel lock is released before requesting new skb and then
2490 * reacquired thus we need to recheck channel state.
2491 */
2492 if (chan->state != BT_CONNECTED) {
2493 kfree_skb(skb);
2494 return -ENOTCONN;
2495 }
2496
9a91a04a
GP		 2497 l2cap_do_send(chan, skb);
2498 err = len;
2499 break;
2500
2501 case L2CAP_MODE_ERTM:
2502 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2503 /* Check outgoing MTU */
2504 if (len > chan->omtu) {
2505 err = -EMSGSIZE;
2506 break;
2507 }
9a91a04a 2508
94122bbe 2509 __skb_queue_head_init(&seg_queue);
9a91a04a 2510
94122bbe
MM		 2511 /* Do segmentation before calling in to the state machine,
2512 * since it's possible to block while waiting for memory
2513 * allocation.
2514 */
2515 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2516
94122bbe
MM		 2517 /* The channel could have been closed while segmenting,
2518 * check that it is still connected.
2519 */
2520 if (chan->state != BT_CONNECTED) {
2521 __skb_queue_purge(&seg_queue);
2522 err = -ENOTCONN;
9a91a04a
GP		 2523 }
2524
94122bbe 2525 if (err)
9a91a04a 2526 break;
9a91a04a 2527
3733937d 2528 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2529 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2530 else
d660366d 2531 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2532
d660366d 2533 err = len;
9a91a04a 2534
94122bbe
MM		 2535 /* If the skbs were not queued for sending, they'll still be in
2536 * seg_queue and need to be purged.
2537 */
2538 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2539 break;
2540
2541 default:
2542 BT_DBG("bad state %1.1x", chan->mode);
2543 err = -EBADFD;
2544 }
2545
2546 return err;
2547}
6b8d4a6a 2548EXPORT_SYMBOL_GPL(l2cap_chan_send);
9a91a04a 2549
d2a7ac5d
MM		 2550static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2551{
bed68bde
MM		 2552 struct l2cap_ctrl control;
2553 u16 seq;
2554
b4400672 2555 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2556
2557 memset(&control, 0, sizeof(control));
2558 control.sframe = 1;
2559 control.super = L2CAP_SUPER_SREJ;
2560
2561 for (seq = chan->expected_tx_seq; seq != txseq;
2562 seq = __next_seq(chan, seq)) {
2563 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2564 control.reqseq = seq;
2565 l2cap_send_sframe(chan, &control);
2566 l2cap_seq_list_append(&chan->srej_list, seq);
2567 }
2568 }
2569
2570 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2571}
2572
2573static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2574{
bed68bde
MM		 2575 struct l2cap_ctrl control;
2576
2577 BT_DBG("chan %p", chan);
2578
2579 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2580 return;
2581
2582 memset(&control, 0, sizeof(control));
2583 control.sframe = 1;
2584 control.super = L2CAP_SUPER_SREJ;
2585 control.reqseq = chan->srej_list.tail;
2586 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2587}
2588
2589static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2590{
bed68bde
MM		 2591 struct l2cap_ctrl control;
2592 u16 initial_head;
2593 u16 seq;
2594
b4400672 2595 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2596
2597 memset(&control, 0, sizeof(control));
2598 control.sframe = 1;
2599 control.super = L2CAP_SUPER_SREJ;
2600
2601 /* Capture initial list head to allow only one pass through the list. */
2602 initial_head = chan->srej_list.head;
2603
2604 do {
2605 seq = l2cap_seq_list_pop(&chan->srej_list);
2606 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2607 break;
2608
2609 control.reqseq = seq;
2610 l2cap_send_sframe(chan, &control);
2611 l2cap_seq_list_append(&chan->srej_list, seq);
2612 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2613}
2614
608bcc6d
MM		 2615static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2616{
2617 struct sk_buff *acked_skb;
2618 u16 ackseq;
2619
b4400672 2620 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2621
2622 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2623 return;
2624
b4400672 2625 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2626 chan->expected_ack_seq, chan->unacked_frames);
2627
2628 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2629 ackseq = __next_seq(chan, ackseq)) {
2630
2631 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2632 if (acked_skb) {
2633 skb_unlink(acked_skb, &chan->tx_q);
2634 kfree_skb(acked_skb);
2635 chan->unacked_frames--;
2636 }
2637 }
2638
2639 chan->expected_ack_seq = reqseq;
2640
2641 if (chan->unacked_frames == 0)
2642 __clear_retrans_timer(chan);
2643
b4400672 2644 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2645}
2646
2647static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2648{
2649 BT_DBG("chan %p", chan);
2650
2651 chan->expected_tx_seq = chan->buffer_seq;
2652 l2cap_seq_list_clear(&chan->srej_list);
2653 skb_queue_purge(&chan->srej_q);
2654 chan->rx_state = L2CAP_RX_STATE_RECV;
2655}
2656
d660366d
GP		 2657static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2658 struct l2cap_ctrl *control,
2659 struct sk_buff_head *skbs, u8 event)
608bcc6d 2660{
608bcc6d
MM		 2661 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2662 event);
2663
2664 switch (event) {
2665 case L2CAP_EV_DATA_REQUEST:
2666 if (chan->tx_send_head == NULL)
2667 chan->tx_send_head = skb_peek(skbs);
2668
2669 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2670 l2cap_ertm_send(chan);
2671 break;
2672 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2673 BT_DBG("Enter LOCAL_BUSY");
2674 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2675
2676 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2677 /* The SREJ_SENT state must be aborted if we are to
2678 * enter the LOCAL_BUSY state.
2679 */
2680 l2cap_abort_rx_srej_sent(chan);
2681 }
2682
2683 l2cap_send_ack(chan);
2684
2685 break;
2686 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2687 BT_DBG("Exit LOCAL_BUSY");
2688 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2689
2690 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2691 struct l2cap_ctrl local_control;
2692
2693 memset(&local_control, 0, sizeof(local_control));
2694 local_control.sframe = 1;
2695 local_control.super = L2CAP_SUPER_RR;
2696 local_control.poll = 1;
2697 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2698 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2699
2700 chan->retry_count = 1;
2701 __set_monitor_timer(chan);
2702 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2703 }
2704 break;
2705 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2706 l2cap_process_reqseq(chan, control->reqseq);
2707 break;
2708 case L2CAP_EV_EXPLICIT_POLL:
2709 l2cap_send_rr_or_rnr(chan, 1);
2710 chan->retry_count = 1;
2711 __set_monitor_timer(chan);
2712 __clear_ack_timer(chan);
2713 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2714 break;
2715 case L2CAP_EV_RETRANS_TO:
2716 l2cap_send_rr_or_rnr(chan, 1);
2717 chan->retry_count = 1;
2718 __set_monitor_timer(chan);
2719 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2720 break;
2721 case L2CAP_EV_RECV_FBIT:
2722 /* Nothing to process */
2723 break;
2724 default:
2725 break;
2726 }
608bcc6d
MM		 2727}
2728
d660366d
GP		 2729static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2730 struct l2cap_ctrl *control,
2731 struct sk_buff_head *skbs, u8 event)
608bcc6d 2732{
608bcc6d
MM		 2733 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2734 event);
2735
2736 switch (event) {
2737 case L2CAP_EV_DATA_REQUEST:
2738 if (chan->tx_send_head == NULL)
2739 chan->tx_send_head = skb_peek(skbs);
2740 /* Queue data, but don't send. */
2741 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2742 break;
2743 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2744 BT_DBG("Enter LOCAL_BUSY");
2745 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2746
2747 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2748 /* The SREJ_SENT state must be aborted if we are to
2749 * enter the LOCAL_BUSY state.
2750 */
2751 l2cap_abort_rx_srej_sent(chan);
2752 }
2753
2754 l2cap_send_ack(chan);
2755
2756 break;
2757 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2758 BT_DBG("Exit LOCAL_BUSY");
2759 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2760
2761 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2762 struct l2cap_ctrl local_control;
2763 memset(&local_control, 0, sizeof(local_control));
2764 local_control.sframe = 1;
2765 local_control.super = L2CAP_SUPER_RR;
2766 local_control.poll = 1;
2767 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2768 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2769
2770 chan->retry_count = 1;
2771 __set_monitor_timer(chan);
2772 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2773 }
2774 break;
2775 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2776 l2cap_process_reqseq(chan, control->reqseq);
2777
2778 /* Fall through */
2779
2780 case L2CAP_EV_RECV_FBIT:
2781 if (control && control->final) {
2782 __clear_monitor_timer(chan);
2783 if (chan->unacked_frames > 0)
2784 __set_retrans_timer(chan);
2785 chan->retry_count = 0;
2786 chan->tx_state = L2CAP_TX_STATE_XMIT;
2787 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2788 }
2789 break;
2790 case L2CAP_EV_EXPLICIT_POLL:
2791 /* Ignore */
2792 break;
2793 case L2CAP_EV_MONITOR_TO:
2794 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2795 l2cap_send_rr_or_rnr(chan, 1);
2796 __set_monitor_timer(chan);
2797 chan->retry_count++;
2798 } else {
5e4e3972 2799 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2800 }
2801 break;
2802 default:
2803 break;
2804 }
608bcc6d
MM		 2805}
2806
d660366d
GP		 2807static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2808 struct sk_buff_head *skbs, u8 event)
608bcc6d 2809{
608bcc6d
MM		 2810 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2811 chan, control, skbs, event, chan->tx_state);
2812
2813 switch (chan->tx_state) {
2814 case L2CAP_TX_STATE_XMIT:
d660366d 2815 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2816 break;
2817 case L2CAP_TX_STATE_WAIT_F:
d660366d 2818 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2819 break;
2820 default:
2821 /* Ignore event */
2822 break;
2823 }
608bcc6d
MM		 2824}
2825
4b51dae9
MM		 2826static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2827 struct l2cap_ctrl *control)
2828{
2829 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2830 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2831}
2832
f80842a8
MM		 2833static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2834 struct l2cap_ctrl *control)
2835{
2836 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2837 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2838}
2839
1da177e4
LT		 2840/* Copy frame to all raw sockets on that connection */
2841static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2842{
1da177e4 2843 struct sk_buff *nskb;
48454079 2844 struct l2cap_chan *chan;
1da177e4
LT		 2845
2846 BT_DBG("conn %p", conn);
2847
3df91ea2 2848 mutex_lock(&conn->chan_lock);
3d57dc68 2849
3df91ea2 2850 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2851 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2852 continue;
2853
7f5396a7 2854 /* Don't send frame to the channel it came from */
a4368ff3 2855 if (bt_cb(skb)->l2cap.chan == chan)
1da177e4 2856 continue;
7f5396a7 2857
8bcde1f2 2858 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2859 if (!nskb)
1da177e4 2860 continue;
80b98027 2861 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2862 kfree_skb(nskb);
2863 }
3d57dc68 2864
3df91ea2 2865 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2866}
2867
2868/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2869static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2870 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2871{
2872 struct sk_buff *skb, **frag;
2873 struct l2cap_cmd_hdr *cmd;
2874 struct l2cap_hdr *lh;
2875 int len, count;
2876
b4400672
AE		 2877 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2878 conn, code, ident, dlen);
1da177e4 2879
300b962e
AL		 2880 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2881 return NULL;
2882
1da177e4
LT		 2883 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2884 count = min_t(unsigned int, conn->mtu, len);
2885
8bcde1f2 2886 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2887 if (!skb)
2888 return NULL;
2889
2890 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2891 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2892
2893 if (conn->hcon->type == LE_LINK)
dcf4adbf 2894 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2895 else
dcf4adbf 2896 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2897
2898 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2899 cmd->code = code;
2900 cmd->ident = ident;
aca3192c 2901 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2902
2903 if (dlen) {
2904 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2905 memcpy(skb_put(skb, count), data, count);
2906 data += count;
2907 }
2908
2909 len -= skb->len;
2910
2911 /* Continuation fragments (no L2CAP header) */
2912 frag = &skb_shinfo(skb)->frag_list;
2913 while (len) {
2914 count = min_t(unsigned int, conn->mtu, len);
2915
8bcde1f2 2916 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2917 if (!*frag)
2918 goto fail;
2919
2920 memcpy(skb_put(*frag, count), data, count);
2921
2922 len -= count;
2923 data += count;
2924
2925 frag = &(*frag)->next;
2926 }
2927
2928 return skb;
2929
2930fail:
2931 kfree_skb(skb);
2932 return NULL;
2933}
2934
2d792818
GP		 2935static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2936 unsigned long *val)
1da177e4
LT		 2937{
2938 struct l2cap_conf_opt *opt = *ptr;
2939 int len;
2940
2941 len = L2CAP_CONF_OPT_SIZE + opt->len;
2942 *ptr += len;
2943
2944 *type = opt->type;
2945 *olen = opt->len;
2946
2947 switch (opt->len) {
2948 case 1:
2949 *val = *((u8 *) opt->val);
2950 break;
2951
2952 case 2:
bfaaeb3e 2953 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2954 break;
2955
2956 case 4:
bfaaeb3e 2957 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2958 break;
2959
2960 default:
2961 *val = (unsigned long) opt->val;
2962 break;
2963 }
2964
b4400672 2965 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2966 return len;
2967}
2968
1da177e4
LT		 2969static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2970{
2971 struct l2cap_conf_opt *opt = *ptr;
2972
b4400672 2973 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2974
2975 opt->type = type;
2976 opt->len = len;
2977
2978 switch (len) {
2979 case 1:
2980 *((u8 *) opt->val) = val;
2981 break;
2982
2983 case 2:
4f8b691c 2984 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2985 break;
2986
2987 case 4:
4f8b691c 2988 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2989 break;
2990
2991 default:
2992 memcpy(opt->val, (void *) val, len);
2993 break;
2994 }
2995
2996 *ptr += L2CAP_CONF_OPT_SIZE + len;
2997}
2998
f89cef09
AE		 2999static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
3000{
3001 struct l2cap_conf_efs efs;
3002
1ec918ce 3003 switch (chan->mode) {
f89cef09
AE		 3004 case L2CAP_MODE_ERTM:
3005 efs.id = chan->local_id;
3006 efs.stype = chan->local_stype;
3007 efs.msdu = cpu_to_le16(chan->local_msdu);
3008 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
dcf4adbf
JP		 3009 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
3010 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3011 break;
3012
3013 case L2CAP_MODE_STREAMING:
3014 efs.id = 1;
3015 efs.stype = L2CAP_SERV_BESTEFFORT;
3016 efs.msdu = cpu_to_le16(chan->local_msdu);
3017 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3018 efs.acc_lat = 0;
3019 efs.flush_to = 0;
3020 break;
3021
3022 default:
3023 return;
3024 }
3025
3026 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3027 (unsigned long) &efs);
f89cef09
AE		 3028}
3029
721c4181 3030static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3031{
721c4181 3032 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3033 ack_timer.work);
3034 u16 frames_to_ack;
c1b4f43b 3035
2fb9b3d4
GP		 3036 BT_DBG("chan %p", chan);
3037
6be36555
AE		 3038 l2cap_chan_lock(chan);
3039
0362520b
MM		 3040 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3041 chan->last_acked_seq);
6be36555 3042
0362520b
MM		 3043 if (frames_to_ack)
3044 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3045
0362520b 3046 l2cap_chan_unlock(chan);
09bfb2ee 3047 l2cap_chan_put(chan);
c1b4f43b
GP		 3048}
3049
466f8004 3050int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3051{
3c588192
MM		 3052 int err;
3053
105bdf9e
MM		 3054 chan->next_tx_seq = 0;
3055 chan->expected_tx_seq = 0;
42e5c802 3056 chan->expected_ack_seq = 0;
6a026610 3057 chan->unacked_frames = 0;
42e5c802 3058 chan->buffer_seq = 0;
6a026610 3059 chan->frames_sent = 0;
105bdf9e
MM		 3060 chan->last_acked_seq = 0;
3061 chan->sdu = NULL;
3062 chan->sdu_last_frag = NULL;
3063 chan->sdu_len = 0;
3064
d34c34fb
MM		 3065 skb_queue_head_init(&chan->tx_q);
3066
6ed971ca
MH		 3067 chan->local_amp_id = AMP_ID_BREDR;
3068 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3069 chan->move_state = L2CAP_MOVE_STABLE;
3070 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3071
105bdf9e
MM		 3072 if (chan->mode != L2CAP_MODE_ERTM)
3073 return 0;
3074
3075 chan->rx_state = L2CAP_RX_STATE_RECV;
3076 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3077
721c4181
GP		 3078 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3079 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3080 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3081
f1c6775b 3082 skb_queue_head_init(&chan->srej_q);
1890d36b 3083
3c588192
MM		 3084 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3085 if (err < 0)
3086 return err;
3087
9dc9affc
MM		 3088 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3089 if (err < 0)
3090 l2cap_seq_list_free(&chan->srej_list);
3091
3092 return err;
0565c1c2
GP		 3093}
3094
f2fcfcd6
GP		 3095static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3096{
3097 switch (mode) {
3098 case L2CAP_MODE_STREAMING:
3099 case L2CAP_MODE_ERTM:
3100 if (l2cap_mode_supported(mode, remote_feat_mask))
3101 return mode;
3102 /* fall through */
3103 default:
3104 return L2CAP_MODE_BASIC;
3105 }
3106}
3107
848566b3 3108static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3109{
0bd49fc7
JH		 3110 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3111 (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW));
6327eb98
AE		 3112}
3113
848566b3 3114static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3115{
0bd49fc7
JH		 3116 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3117 (conn->feat_mask & L2CAP_FEAT_EXT_FLOW));
f89cef09
AE		 3118}
3119
36c86c85
MM		 3120static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3121 struct l2cap_conf_rfc *rfc)
3122{
6ed971ca 3123 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3124 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3125
3126 /* Class 1 devices have must have ERTM timeouts
3127 * exceeding the Link Supervision Timeout. The
3128 * default Link Supervision Timeout for AMP
3129 * controllers is 10 seconds.
3130 *
3131 * Class 1 devices use 0xffffffff for their
3132 * best-effort flush timeout, so the clamping logic
3133 * will result in a timeout that meets the above
3134 * requirement. ERTM timeouts are 16-bit values, so
3135 * the maximum timeout is 65.535 seconds.
3136 */
3137
3138 /* Convert timeout to milliseconds and round */
3139 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3140
3141 /* This is the recommended formula for class 2 devices
3142 * that start ERTM timers when packets are sent to the
3143 * controller.
3144 */
3145 ertm_to = 3 * ertm_to + 500;
3146
3147 if (ertm_to > 0xffff)
3148 ertm_to = 0xffff;
3149
3150 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3151 rfc->monitor_timeout = rfc->retrans_timeout;
3152 } else {
dcf4adbf
JP		 3153 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3154 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
36c86c85
MM		 3155 }
3156}
3157
6327eb98
AE		 3158static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3159{
3160 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3161 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3162 /* use extended control field */
3163 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3164 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3165 } else {
6327eb98 3166 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3167 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3168 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3169 }
c20f8e35 3170 chan->ack_win = chan->tx_win;
6327eb98
AE		 3171}
3172
710f9b0a 3173static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3174{
1da177e4 3175 struct l2cap_conf_req *req = data;
0c1bc5c6 3176 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3177 void *ptr = req->data;
c8f79162 3178 u16 size;
1da177e4 3179
49208c9c 3180 BT_DBG("chan %p", chan);
1da177e4 3181
73ffa904 3182 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3183 goto done;
3184
0c1bc5c6 3185 switch (chan->mode) {
f2fcfcd6
GP		 3186 case L2CAP_MODE_STREAMING:
3187 case L2CAP_MODE_ERTM:
c1360a1c 3188 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3189 break;
85eb53c6 3190
848566b3 3191 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3192 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3193
2ba13ed6 3194 /* fall through */
f2fcfcd6 3195 default:
8c1d787b 3196 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3197 break;
3198 }
3199
3200done:
0c1bc5c6
GP		 3201 if (chan->imtu != L2CAP_DEFAULT_MTU)
3202 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3203
0c1bc5c6 3204 switch (chan->mode) {
65c7c491 3205 case L2CAP_MODE_BASIC:
6fea7ad1
MH		 3206 if (disable_ertm)
3207 break;
3208
8c1d787b 3209 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3210 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3211 break;
3212
62547752
GP		 3213 rfc.mode = L2CAP_MODE_BASIC;
3214 rfc.txwin_size = 0;
3215 rfc.max_transmit = 0;
3216 rfc.retrans_timeout = 0;
3217 rfc.monitor_timeout = 0;
3218 rfc.max_pdu_size = 0;
3219
63406504 3220 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3221 (unsigned long) &rfc);
65c7c491
MH		 3222 break;
3223
3224 case L2CAP_MODE_ERTM:
3225 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3226 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3227
3228 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3229
3230 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3231 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3232 L2CAP_FCS_SIZE);
c8f79162 3233 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3234
6327eb98
AE		 3235 l2cap_txwin_setup(chan);
3236
3237 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3238 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3239
63406504 3240 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3241 (unsigned long) &rfc);
63406504 3242
f89cef09
AE		 3243 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3244 l2cap_add_opt_efs(&ptr, chan);
3245
6327eb98
AE		 3246 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3247 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3248 chan->tx_win);
60918918
AE		 3249
3250 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3251 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3252 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3253 chan->fcs = L2CAP_FCS_NONE;
3254 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3255 chan->fcs);
3256 }
f2fcfcd6
GP		 3257 break;
3258
3259 case L2CAP_MODE_STREAMING:
273759e2 3260 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3261 rfc.mode = L2CAP_MODE_STREAMING;
3262 rfc.txwin_size = 0;
3263 rfc.max_transmit = 0;
3264 rfc.retrans_timeout = 0;
3265 rfc.monitor_timeout = 0;
c8f79162
AE		 3266
3267 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3268 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3269 L2CAP_FCS_SIZE);
c8f79162 3270 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3271
63406504 3272 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3273 (unsigned long) &rfc);
63406504 3274
f89cef09
AE		 3275 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3276 l2cap_add_opt_efs(&ptr, chan);
3277
60918918
AE		 3278 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3279 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3280 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3281 chan->fcs = L2CAP_FCS_NONE;
3282 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3283 chan->fcs);
3284 }
65c7c491
MH		 3285 break;
3286 }
1da177e4 3287
fe4128e0 3288 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3289 req->flags = cpu_to_le16(0);
1da177e4
LT		 3290
3291 return ptr - data;
3292}
3293
73ffa904 3294static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3295{
5dee9e7c
MH		 3296 struct l2cap_conf_rsp *rsp = data;
3297 void *ptr = rsp->data;
73ffa904
GP		 3298 void *req = chan->conf_req;
3299 int len = chan->conf_len;
5dee9e7c
MH		 3300 int type, hint, olen;
3301 unsigned long val;
6464f35f 3302 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3303 struct l2cap_conf_efs efs;
3304 u8 remote_efs = 0;
861d6882 3305 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3306 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3307 u16 size;
1da177e4 3308
73ffa904 3309 BT_DBG("chan %p", chan);
820ae1b8 3310
5dee9e7c
MH		 3311 while (len >= L2CAP_CONF_OPT_SIZE) {
3312 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3313
589d2746 3314 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3315 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3316
3317 switch (type) {
3318 case L2CAP_CONF_MTU:
861d6882 3319 mtu = val;
5dee9e7c
MH		 3320 break;
3321
3322 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3323 chan->flush_to = val;
5dee9e7c
MH		 3324 break;
3325
3326 case L2CAP_CONF_QOS:
3327 break;
3328
6464f35f
MH		 3329 case L2CAP_CONF_RFC:
3330 if (olen == sizeof(rfc))
3331 memcpy(&rfc, (void *) val, olen);
3332 break;
3333
fcc203c3
GP		 3334 case L2CAP_CONF_FCS:
3335 if (val == L2CAP_FCS_NONE)
f2592d3e 3336 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3337 break;
fcc203c3 3338
42dceae2
AE		 3339 case L2CAP_CONF_EFS:
3340 remote_efs = 1;
3341 if (olen == sizeof(efs))
3342 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3343 break;
3344
6327eb98 3345 case L2CAP_CONF_EWS:
0bd49fc7 3346 if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP))
6327eb98 3347 return -ECONNREFUSED;
fcc203c3 3348
6327eb98
AE		 3349 set_bit(FLAG_EXT_CTRL, &chan->flags);
3350 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3351 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3352 chan->remote_tx_win = val;
fcc203c3
GP		 3353 break;
3354
5dee9e7c
MH		 3355 default:
3356 if (hint)
3357 break;
3358
3359 result = L2CAP_CONF_UNKNOWN;
3360 *((u8 *) ptr++) = type;
3361 break;
3362 }
3363 }
3364
73ffa904 3365 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3366 goto done;
3367
0c1bc5c6 3368 switch (chan->mode) {
f2fcfcd6
GP		 3369 case L2CAP_MODE_STREAMING:
3370 case L2CAP_MODE_ERTM:
c1360a1c 3371 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3372 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3373 chan->conn->feat_mask);
85eb53c6
GP		 3374 break;
3375 }
3376
42dceae2 3377 if (remote_efs) {
848566b3 3378 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3379 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3380 else
3381 return -ECONNREFUSED;
3382 }
3383
0c1bc5c6 3384 if (chan->mode != rfc.mode)
f2fcfcd6 3385 return -ECONNREFUSED;
742e519b 3386
f2fcfcd6 3387 break;
f2fcfcd6
GP		 3388 }
3389
3390done:
0c1bc5c6 3391 if (chan->mode != rfc.mode) {
f2fcfcd6 3392 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3393 rfc.mode = chan->mode;
f2fcfcd6 3394
73ffa904 3395 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3396 return -ECONNREFUSED;
3397
2d792818
GP		 3398 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3399 (unsigned long) &rfc);
f2fcfcd6
GP		 3400 }
3401
5dee9e7c
MH		 3402 if (result == L2CAP_CONF_SUCCESS) {
3403 /* Configure output options and let the other side know
3404 * which ones we don't like. */
3405
f2fcfcd6
GP		 3406 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3407 result = L2CAP_CONF_UNACCEPT;
3408 else {
0c1bc5c6 3409 chan->omtu = mtu;
c1360a1c 3410 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3411 }
0c1bc5c6 3412 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3413
42dceae2
AE		 3414 if (remote_efs) {
3415 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3416 efs.stype != L2CAP_SERV_NOTRAFIC &&
3417 efs.stype != chan->local_stype) {
42dceae2
AE		 3418
3419 result = L2CAP_CONF_UNACCEPT;
3420
3421 if (chan->num_conf_req >= 1)
3422 return -ECONNREFUSED;
3423
3424 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3425 sizeof(efs),
3426 (unsigned long) &efs);
0e8b207e 3427 } else {
3e6b3b95 3428 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3429 result = L2CAP_CONF_PENDING;
3430 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3431 }
3432 }
3433
f2fcfcd6
GP		 3434 switch (rfc.mode) {
3435 case L2CAP_MODE_BASIC:
47d1ec61 3436 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3437 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3438 break;
3439
3440 case L2CAP_MODE_ERTM:
6327eb98
AE		 3441 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3442 chan->remote_tx_win = rfc.txwin_size;
3443 else
3444 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3445
2c03a7a4 3446 chan->remote_max_tx = rfc.max_transmit;
1c762159 3447
c8f79162 3448 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3449 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3450 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3451 rfc.max_pdu_size = cpu_to_le16(size);
3452 chan->remote_mps = size;
f2fcfcd6 3453
36c86c85 3454 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3455
c1360a1c 3456 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3457
3458 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3459 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3460
42dceae2
AE		 3461 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3462 chan->remote_id = efs.id;
3463 chan->remote_stype = efs.stype;
3464 chan->remote_msdu = le16_to_cpu(efs.msdu);
3465 chan->remote_flush_to =
2d792818 3466 le32_to_cpu(efs.flush_to);
42dceae2 3467 chan->remote_acc_lat =
2d792818 3468 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3469 chan->remote_sdu_itime =
3470 le32_to_cpu(efs.sdu_itime);
3471 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3472 sizeof(efs),
3473 (unsigned long) &efs);
42dceae2 3474 }
f2fcfcd6
GP		 3475 break;
3476
3477 case L2CAP_MODE_STREAMING:
c8f79162 3478 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3479 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3480 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3481 rfc.max_pdu_size = cpu_to_le16(size);
3482 chan->remote_mps = size;
f2fcfcd6 3483
c1360a1c 3484 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3485
2d792818
GP		 3486 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3487 (unsigned long) &rfc);
68ae6639 3488
f2fcfcd6
GP		 3489 break;
3490
3491 default:
5dee9e7c 3492 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3493
6464f35f 3494 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3495 rfc.mode = chan->mode;
f2fcfcd6 3496 }
6464f35f 3497
f2fcfcd6 3498 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3499 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3500 }
fe4128e0 3501 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3502 rsp->result = cpu_to_le16(result);
dcf4adbf 3503 rsp->flags = cpu_to_le16(0);
5dee9e7c
MH		 3504
3505 return ptr - data;
1da177e4
LT		 3506}
3507
2d792818
GP		 3508static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3509 void *data, u16 *result)
f2fcfcd6 3510{
f2fcfcd6
GP		 3511 struct l2cap_conf_req *req = data;
3512 void *ptr = req->data;
3513 int type, olen;
3514 unsigned long val;
36e999a8 3515 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3516 struct l2cap_conf_efs efs;
f2fcfcd6 3517
fe4128e0 3518 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3519
3520 while (len >= L2CAP_CONF_OPT_SIZE) {
3521 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3522
3523 switch (type) {
3524 case L2CAP_CONF_MTU:
3525 if (val < L2CAP_DEFAULT_MIN_MTU) {
3526 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3527 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3528 } else
0c1bc5c6
GP		 3529 chan->imtu = val;
3530 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3531 break;
3532
3533 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3534 chan->flush_to = val;
f2fcfcd6 3535 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3536 2, chan->flush_to);
f2fcfcd6
GP		 3537 break;
3538
3539 case L2CAP_CONF_RFC:
3540 if (olen == sizeof(rfc))
3541 memcpy(&rfc, (void *)val, olen);
3542
c1360a1c 3543 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3544 rfc.mode != chan->mode)
f2fcfcd6
GP		 3545 return -ECONNREFUSED;
3546
47d1ec61 3547 chan->fcs = 0;
f2fcfcd6
GP		 3548
3549 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3550 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3551 break;
6327eb98
AE		 3552
3553 case L2CAP_CONF_EWS:
c20f8e35 3554 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3555 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3556 chan->tx_win);
6327eb98 3557 break;
66af7aaf
AE		 3558
3559 case L2CAP_CONF_EFS:
3560 if (olen == sizeof(efs))
3561 memcpy(&efs, (void *)val, olen);
3562
3563 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3564 efs.stype != L2CAP_SERV_NOTRAFIC &&
3565 efs.stype != chan->local_stype)
66af7aaf
AE		 3566 return -ECONNREFUSED;
3567
2d792818
GP		 3568 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3569 (unsigned long) &efs);
66af7aaf 3570 break;
cbabee78
AE		 3571
3572 case L2CAP_CONF_FCS:
3573 if (*result == L2CAP_CONF_PENDING)
3574 if (val == L2CAP_FCS_NONE)
f2592d3e 3575 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3576 &chan->conf_state);
3577 break;
f2fcfcd6
GP		 3578 }
3579 }
3580
0c1bc5c6 3581 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3582 return -ECONNREFUSED;
3583
0c1bc5c6 3584 chan->mode = rfc.mode;
6c2ea7a8 3585
0e8b207e 3586 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3587 switch (rfc.mode) {
3588 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3589 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3590 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3591 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3592 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3593 chan->ack_win = min_t(u16, chan->ack_win,
3594 rfc.txwin_size);
66af7aaf
AE		 3595
3596 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3597 chan->local_msdu = le16_to_cpu(efs.msdu);
3598 chan->local_sdu_itime =
2d792818 3599 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3600 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3601 chan->local_flush_to =
2d792818 3602 le32_to_cpu(efs.flush_to);
66af7aaf 3603 }
f2fcfcd6 3604 break;
66af7aaf 3605
f2fcfcd6 3606 case L2CAP_MODE_STREAMING:
47d1ec61 3607 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3608 }
3609 }
3610
fe4128e0 3611 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3612 req->flags = cpu_to_le16(0);
f2fcfcd6
GP		 3613
3614 return ptr - data;
3615}
3616
2d792818
GP		 3617static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3618 u16 result, u16 flags)
1da177e4
LT		 3619{
3620 struct l2cap_conf_rsp *rsp = data;
3621 void *ptr = rsp->data;
1da177e4 3622
fe4128e0 3623 BT_DBG("chan %p", chan);
1da177e4 3624
fe4128e0 3625 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3626 rsp->result = cpu_to_le16(result);
aca3192c 3627 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3628
3629 return ptr - data;
3630}
3631
27e2d4c8
JH		 3632void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3633{
3634 struct l2cap_le_conn_rsp rsp;
3635 struct l2cap_conn *conn = chan->conn;
3636
3637 BT_DBG("chan %p", chan);
3638
3639 rsp.dcid = cpu_to_le16(chan->scid);
3640 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3641 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3642 rsp.credits = cpu_to_le16(chan->rx_credits);
dcf4adbf 3643 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
27e2d4c8
JH		 3644
3645 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3646 &rsp);
3647}
3648
8c1d787b 3649void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3650{
3651 struct l2cap_conn_rsp rsp;
8c1d787b 3652 struct l2cap_conn *conn = chan->conn;
710f9b0a 3653 u8 buf[128];
439f34ac 3654 u8 rsp_code;
710f9b0a 3655
fe4128e0
GP		 3656 rsp.scid = cpu_to_le16(chan->dcid);
3657 rsp.dcid = cpu_to_le16(chan->scid);
dcf4adbf
JP		 3658 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3659 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3660
3661 if (chan->hs_hcon)
3662 rsp_code = L2CAP_CREATE_CHAN_RSP;
3663 else
3664 rsp_code = L2CAP_CONN_RSP;
3665
3666 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3667
3668 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3669
c1360a1c 3670 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3671 return;
3672
710f9b0a 3673 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3674 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3675 chan->num_conf_req++;
3676}
3677
47d1ec61 3678static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3679{
7b1c0049
GP		 3680 int type, olen;
3681 unsigned long val;
c20f8e35
MM		 3682 /* Use sane default values in case a misbehaving remote device
3683 * did not send an RFC or extended window size option.
3684 */
3685 u16 txwin_ext = chan->ack_win;
3686 struct l2cap_conf_rfc rfc = {
3687 .mode = chan->mode,
dcf4adbf
JP		 3688 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3689 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
c20f8e35
MM		 3690 .max_pdu_size = cpu_to_le16(chan->imtu),
3691 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3692 };
7b1c0049 3693
47d1ec61 3694 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3695
0c1bc5c6 3696 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3697 return;
3698
3699 while (len >= L2CAP_CONF_OPT_SIZE) {
3700 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3701
c20f8e35
MM		 3702 switch (type) {
3703 case L2CAP_CONF_RFC:
3704 if (olen == sizeof(rfc))
3705 memcpy(&rfc, (void *)val, olen);
8f321f85 3706 break;
c20f8e35
MM		 3707 case L2CAP_CONF_EWS:
3708 txwin_ext = val;
3709 break;
3710 }
7b1c0049
GP		 3711 }
3712
7b1c0049
GP		 3713 switch (rfc.mode) {
3714 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3715 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3716 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3717 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3718 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3719 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3720 else
3721 chan->ack_win = min_t(u16, chan->ack_win,
3722 rfc.txwin_size);
7b1c0049
GP		 3723 break;
3724 case L2CAP_MODE_STREAMING:
47d1ec61 3725 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3726 }
3727}
3728
2d792818 3729static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3730 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3731 u8 *data)
4e8402a3 3732{
e2fd318e 3733 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3734
cb3b3152
JH		 3735 if (cmd_len < sizeof(*rej))
3736 return -EPROTO;
3737
e2fd318e 3738 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3739 return 0;
3740
3741 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3742 cmd->ident == conn->info_ident) {
17cd3f37 3743 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3744
3745 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3746 conn->info_ident = 0;
984947dc 3747
4e8402a3
MH		 3748 l2cap_conn_start(conn);
3749 }
3750
3751 return 0;
3752}
3753
1700915f
MM		 3754static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3755 struct l2cap_cmd_hdr *cmd,
3756 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3757{
1da177e4
LT		 3758 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3759 struct l2cap_conn_rsp rsp;
23691d75 3760 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3761 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3762
3763 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3764 __le16 psm = req->psm;
1da177e4 3765
097db76c 3766 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3767
3768 /* Check if we have socket listening on psm */
6f59b904 3769 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3770 &conn->hcon->dst, ACL_LINK);
23691d75 3771 if (!pchan) {
1da177e4
LT		 3772 result = L2CAP_CR_BAD_PSM;
3773 goto sendresp;
3774 }
3775
3df91ea2 3776 mutex_lock(&conn->chan_lock);
8ffb9290 3777 l2cap_chan_lock(pchan);
e0f0cb56 3778
e7c29cb1 3779 /* Check if the ACL is secure enough (if not SDP) */
dcf4adbf 3780 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3781 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3782 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3783 result = L2CAP_CR_SEC_BLOCK;
3784 goto response;
3785 }
3786
1da177e4
LT		 3787 result = L2CAP_CR_NO_MEM;
3788
2dfa1003
GP		 3789 /* Check if we already have channel with that dcid */
3790 if (__l2cap_get_chan_by_dcid(conn, scid))
3791 goto response;
3792
80b98027 3793 chan = pchan->ops->new_connection(pchan);
80808e43 3794 if (!chan)
1da177e4
LT		 3795 goto response;
3796
330b6c15
SS		 3797 /* For certain devices (ex: HID mouse), support for authentication,
3798 * pairing and bonding is optional. For such devices, inorder to avoid
3799 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3800 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3801 */
3802 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3803
7eafc59e
MH		 3804 bacpy(&chan->src, &conn->hcon->src);
3805 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 3806 chan->src_type = bdaddr_src_type(conn->hcon);
3807 chan->dst_type = bdaddr_dst_type(conn->hcon);
fe4128e0
GP		 3808 chan->psm = psm;
3809 chan->dcid = scid;
1700915f 3810 chan->local_amp_id = amp_id;
1da177e4 3811
6be36555 3812 __l2cap_chan_add(conn, chan);
48454079 3813
fe4128e0 3814 dcid = chan->scid;
1da177e4 3815
8d836d71 3816 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3817
fc7f8a7e 3818 chan->ident = cmd->ident;
1da177e4 3819
984947dc 3820 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
e7cafc45 3821 if (l2cap_chan_check_security(chan, false)) {
bdc25783 3822 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3823 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3824 result = L2CAP_CR_PEND;
3825 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3826 chan->ops->defer(chan);
f66dc81f 3827 } else {
1700915f
MM		 3828 /* Force pending result for AMP controllers.
3829 * The connection will succeed after the
3830 * physical link is up.
3831 */
6ed971ca 3832 if (amp_id == AMP_ID_BREDR) {
f93fa273 3833 l2cap_state_change(chan, BT_CONFIG);
1700915f 3834 result = L2CAP_CR_SUCCESS;
6ed971ca 3835 } else {
f93fa273 3836 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3837 result = L2CAP_CR_PEND;
1700915f 3838 }
f66dc81f
MH		 3839 status = L2CAP_CS_NO_INFO;
3840 }
79d554a6 3841 } else {
f93fa273 3842 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3843 result = L2CAP_CR_PEND;
3844 status = L2CAP_CS_AUTHEN_PEND;
3845 }
3846 } else {
f93fa273 3847 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3848 result = L2CAP_CR_PEND;
3849 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3850 }
3851
1da177e4 3852response:
8ffb9290 3853 l2cap_chan_unlock(pchan);
3df91ea2 3854 mutex_unlock(&conn->chan_lock);
a24cce14 3855 l2cap_chan_put(pchan);
1da177e4
LT		 3856
3857sendresp:
aca3192c
YH		 3858 rsp.scid = cpu_to_le16(scid);
3859 rsp.dcid = cpu_to_le16(dcid);
3860 rsp.result = cpu_to_le16(result);
3861 rsp.status = cpu_to_le16(status);
4c89b6aa 3862 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3863
3864 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3865 struct l2cap_info_req info;
dcf4adbf 3866 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3867
3868 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3869 conn->info_ident = l2cap_get_ident(conn);
3870
ba13ccd9 3871 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3872
2d792818
GP		 3873 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3874 sizeof(info), &info);
79d554a6
MH		 3875 }
3876
c1360a1c 3877 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3878 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3879 u8 buf[128];
c1360a1c 3880 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3881 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3882 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3883 chan->num_conf_req++;
e9aeb2dd 3884 }
1700915f
MM		 3885
3886 return chan;
4c89b6aa 3887}
e9aeb2dd 3888
4c89b6aa 3889static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3890 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3891{
7b064eda
JK		 3892 struct hci_dev *hdev = conn->hcon->hdev;
3893 struct hci_conn *hcon = conn->hcon;
3894
cb3b3152
JH		 3895 if (cmd_len < sizeof(struct l2cap_conn_req))
3896 return -EPROTO;
3897
7b064eda 3898 hci_dev_lock(hdev);
d7a5a11d 3899 if (hci_dev_test_flag(hdev, HCI_MGMT) &&
7b064eda 3900 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
48ec92fa 3901 mgmt_device_connected(hdev, hcon, 0, NULL, 0);
7b064eda
JK		 3902 hci_dev_unlock(hdev);
3903
300229f9 3904 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3905 return 0;
3906}
3907
5909cf30 3908static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3909 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3910 u8 *data)
1da177e4
LT		 3911{
3912 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3913 u16 scid, dcid, result, status;
48454079 3914 struct l2cap_chan *chan;
1da177e4 3915 u8 req[128];
3df91ea2 3916 int err;
1da177e4 3917
cb3b3152
JH		 3918 if (cmd_len < sizeof(*rsp))
3919 return -EPROTO;
3920
1da177e4
LT		 3921 scid = __le16_to_cpu(rsp->scid);
3922 dcid = __le16_to_cpu(rsp->dcid);
3923 result = __le16_to_cpu(rsp->result);
3924 status = __le16_to_cpu(rsp->status);
3925
1b009c98 3926 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3927 dcid, scid, result, status);
1da177e4 3928
3df91ea2
AE		 3929 mutex_lock(&conn->chan_lock);
3930
1da177e4 3931 if (scid) {
3df91ea2
AE		 3932 chan = __l2cap_get_chan_by_scid(conn, scid);
3933 if (!chan) {
21870b52 3934 err = -EBADSLT;
3df91ea2
AE		 3935 goto unlock;
3936 }
1da177e4 3937 } else {
3df91ea2
AE		 3938 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3939 if (!chan) {
21870b52 3940 err = -EBADSLT;
3df91ea2
AE		 3941 goto unlock;
3942 }
1da177e4
LT		 3943 }
3944
3df91ea2
AE		 3945 err = 0;
3946
6be36555 3947 l2cap_chan_lock(chan);
48454079 3948
1da177e4
LT		 3949 switch (result) {
3950 case L2CAP_CR_SUCCESS:
89bc500e 3951 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3952 chan->ident = 0;
fe4128e0 3953 chan->dcid = dcid;
c1360a1c 3954 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3955
c1360a1c 3956 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3957 break;
3958
1da177e4 3959 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3960 l2cap_build_conf_req(chan, req), req);
73ffa904 3961 chan->num_conf_req++;
1da177e4
LT		 3962 break;
3963
3964 case L2CAP_CR_PEND:
c1360a1c 3965 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3966 break;
3967
3968 default:
48454079 3969 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3970 break;
3971 }
3972
6be36555 3973 l2cap_chan_unlock(chan);
3df91ea2
AE		 3974
3975unlock:
3976 mutex_unlock(&conn->chan_lock);
3977
3978 return err;
1da177e4
LT		 3979}
3980
47d1ec61 3981static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3982{
3983 /* FCS is enabled only in ERTM or streaming mode, if one or both
3984 * sides request it.
3985 */
0c1bc5c6 3986 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3987 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3988 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3989 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3990}
3991
29d8a590
AE		 3992static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3993 u8 ident, u16 flags)
3994{
3995 struct l2cap_conn *conn = chan->conn;
3996
3997 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3998 flags);
3999
4000 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
4001 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
4002
4003 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4004 l2cap_build_conf_rsp(chan, data,
4005 L2CAP_CONF_SUCCESS, flags), data);
4006}
4007
662d652d
JH		 4008static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4009 u16 scid, u16 dcid)
4010{
4011 struct l2cap_cmd_rej_cid rej;
4012
dcf4adbf 4013 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
662d652d
JH		 4014 rej.scid = __cpu_to_le16(scid);
4015 rej.dcid = __cpu_to_le16(dcid);
4016
4017 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4018}
4019
2d792818
GP		 4020static inline int l2cap_config_req(struct l2cap_conn *conn,
4021 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4022 u8 *data)
1da177e4
LT		 4023{
4024 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4025 u16 dcid, flags;
4026 u8 rsp[64];
48454079 4027 struct l2cap_chan *chan;
3c588192 4028 int len, err = 0;
1da177e4 4029
cb3b3152
JH		 4030 if (cmd_len < sizeof(*req))
4031 return -EPROTO;
4032
1da177e4
LT		 4033 dcid = __le16_to_cpu(req->dcid);
4034 flags = __le16_to_cpu(req->flags);
4035
4036 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4037
baa7e1fa 4038 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4039 if (!chan) {
4040 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4041 return 0;
4042 }
1da177e4 4043
033b1142 4044 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4045 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4046 chan->dcid);
354f60a9 4047 goto unlock;
df6bd743 4048 }
354f60a9 4049
5dee9e7c 4050 /* Reject if config buffer is too small. */
88219a0f 4051 len = cmd_len - sizeof(*req);
cb3b3152 4052 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4053 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4054 l2cap_build_conf_rsp(chan, rsp,
4055 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4056 goto unlock;
4057 }
4058
4059 /* Store config. */
73ffa904
GP		 4060 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4061 chan->conf_len += len;
1da177e4 4062
59e54bd1 4063 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4064 /* Incomplete config. Send empty response. */
4065 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4066 l2cap_build_conf_rsp(chan, rsp,
4067 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4068 goto unlock;
4069 }
4070
4071 /* Complete config. */
73ffa904 4072 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4073 if (len < 0) {
5e4e3972 4074 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4075 goto unlock;
f2fcfcd6 4076 }
1da177e4 4077
1500109b 4078 chan->ident = cmd->ident;
5dee9e7c 4079 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4080 chan->num_conf_rsp++;
5dee9e7c 4081
5dee9e7c 4082 /* Reset config buffer. */
73ffa904 4083 chan->conf_len = 0;
5dee9e7c 4084
c1360a1c 4085 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4086 goto unlock;
4087
c1360a1c 4088 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4089 set_default_fcs(chan);
fcc203c3 4090
105bdf9e
MM		 4091 if (chan->mode == L2CAP_MODE_ERTM ||
4092 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4093 err = l2cap_ertm_init(chan);
4094
4095 if (err < 0)
5e4e3972 4096 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4097 else
4098 l2cap_chan_ready(chan);
0565c1c2 4099
876d9484
MH		 4100 goto unlock;
4101 }
4102
c1360a1c 4103 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4104 u8 buf[64];
1da177e4 4105 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4106 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4107 chan->num_conf_req++;
1da177e4
LT		 4108 }
4109
49c922bb 4110 /* Got Conf Rsp PENDING from remote side and assume we sent
0e8b207e
AE		 4111 Conf Rsp PENDING in the code above */
4112 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4113 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4114
4115 /* check compatibility */
4116
79de886d 4117 /* Send rsp for BR/EDR channel */
f351bc72 4118 if (!chan->hs_hcon)
79de886d
AE		 4119 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4120 else
4121 chan->ident = cmd->ident;
0e8b207e
AE		 4122 }
4123
1da177e4 4124unlock:
6be36555 4125 l2cap_chan_unlock(chan);
3c588192 4126 return err;
1da177e4
LT		 4127}
4128
2d792818 4129static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4130 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4131 u8 *data)
1da177e4
LT		 4132{
4133 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4134 u16 scid, flags, result;
48454079 4135 struct l2cap_chan *chan;
cb3b3152 4136 int len = cmd_len - sizeof(*rsp);
3c588192 4137 int err = 0;
1da177e4 4138
cb3b3152
JH		 4139 if (cmd_len < sizeof(*rsp))
4140 return -EPROTO;
4141
1da177e4
LT		 4142 scid = __le16_to_cpu(rsp->scid);
4143 flags = __le16_to_cpu(rsp->flags);
4144 result = __le16_to_cpu(rsp->result);
4145
61386cba
AE		 4146 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4147 result, len);
1da177e4 4148
baa7e1fa 4149 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4150 if (!chan)
1da177e4
LT		 4151 return 0;
4152
4153 switch (result) {
4154 case L2CAP_CONF_SUCCESS:
47d1ec61 4155 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4156 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4157 break;
4158
0e8b207e
AE		 4159 case L2CAP_CONF_PENDING:
4160 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4161
4162 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4163 char buf[64];
4164
4165 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4166 buf, &result);
0e8b207e 4167 if (len < 0) {
5e4e3972 4168 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4169 goto done;
4170 }
4171
f351bc72 4172 if (!chan->hs_hcon) {
79de886d
AE		 4173 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4174 0);
5ce66b59
AE		 4175 } else {
4176 if (l2cap_check_efs(chan)) {
4177 amp_create_logical_link(chan);
4178 chan->ident = cmd->ident;
4179 }
4180 }
0e8b207e
AE		 4181 }
4182 goto done;
4183
1da177e4 4184 case L2CAP_CONF_UNACCEPT:
73ffa904 4185 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4186 char req[64];
4187
c2c77ec8 4188 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4189 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4190 goto done;
4191 }
4192
f2fcfcd6
GP		 4193 /* throw out any old stored conf requests */
4194 result = L2CAP_CONF_SUCCESS;
b4450035 4195 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4196 req, &result);
f2fcfcd6 4197 if (len < 0) {
5e4e3972 4198 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4199 goto done;
4200 }
4201
4202 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4203 L2CAP_CONF_REQ, len, req);
73ffa904 4204 chan->num_conf_req++;
f2fcfcd6
GP		 4205 if (result != L2CAP_CONF_SUCCESS)
4206 goto done;
4207 break;
1da177e4
LT		 4208 }
4209
8e87d142 4210 default:
6be36555 4211 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4212
ba13ccd9 4213 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4214 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4215 goto done;
4216 }
4217
59e54bd1 4218 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4219 goto done;
4220
c1360a1c 4221 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4222
c1360a1c 4223 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4224 set_default_fcs(chan);
fcc203c3 4225
105bdf9e
MM		 4226 if (chan->mode == L2CAP_MODE_ERTM ||
4227 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4228 err = l2cap_ertm_init(chan);
0565c1c2 4229
3c588192 4230 if (err < 0)
5e4e3972 4231 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4232 else
4233 l2cap_chan_ready(chan);
1da177e4
LT		 4234 }
4235
4236done:
6be36555 4237 l2cap_chan_unlock(chan);
3c588192 4238 return err;
1da177e4
LT		 4239}
4240
2d792818 4241static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4242 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4243 u8 *data)
1da177e4
LT		 4244{
4245 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4246 struct l2cap_disconn_rsp rsp;
4247 u16 dcid, scid;
48454079 4248 struct l2cap_chan *chan;
1da177e4 4249
cb3b3152
JH		 4250 if (cmd_len != sizeof(*req))
4251 return -EPROTO;
4252
1da177e4
LT		 4253 scid = __le16_to_cpu(req->scid);
4254 dcid = __le16_to_cpu(req->dcid);
4255
4256 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4257
3df91ea2
AE		 4258 mutex_lock(&conn->chan_lock);
4259
4260 chan = __l2cap_get_chan_by_scid(conn, dcid);
4261 if (!chan) {
4262 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4263 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4264 return 0;
3df91ea2 4265 }
1da177e4 4266
6be36555
AE		 4267 l2cap_chan_lock(chan);
4268
fe4128e0
GP		 4269 rsp.dcid = cpu_to_le16(chan->scid);
4270 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4271 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4272
5ec1bbe5 4273 chan->ops->set_shutdown(chan);
1da177e4 4274
61d6ef3e 4275 l2cap_chan_hold(chan);
48454079 4276 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4277
4278 l2cap_chan_unlock(chan);
1da177e4 4279
80b98027 4280 chan->ops->close(chan);
61d6ef3e 4281 l2cap_chan_put(chan);
3df91ea2
AE		 4282
4283 mutex_unlock(&conn->chan_lock);
4284
1da177e4
LT		 4285 return 0;
4286}
4287
2d792818 4288static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4289 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4290 u8 *data)
1da177e4
LT		 4291{
4292 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4293 u16 dcid, scid;
48454079 4294 struct l2cap_chan *chan;
1da177e4 4295
cb3b3152
JH		 4296 if (cmd_len != sizeof(*rsp))
4297 return -EPROTO;
4298
1da177e4
LT		 4299 scid = __le16_to_cpu(rsp->scid);
4300 dcid = __le16_to_cpu(rsp->dcid);
4301
4302 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4303
3df91ea2
AE		 4304 mutex_lock(&conn->chan_lock);
4305
4306 chan = __l2cap_get_chan_by_scid(conn, scid);
4307 if (!chan) {
4308 mutex_unlock(&conn->chan_lock);
1da177e4 4309 return 0;
3df91ea2 4310 }
1da177e4 4311
6be36555 4312 l2cap_chan_lock(chan);
48454079 4313
61d6ef3e 4314 l2cap_chan_hold(chan);
48454079 4315 l2cap_chan_del(chan, 0);
6be36555
AE		 4316
4317 l2cap_chan_unlock(chan);
1da177e4 4318
80b98027 4319 chan->ops->close(chan);
61d6ef3e 4320 l2cap_chan_put(chan);
3df91ea2
AE		 4321
4322 mutex_unlock(&conn->chan_lock);
4323
1da177e4
LT		 4324 return 0;
4325}
4326
2d792818 4327static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4328 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4329 u8 *data)
1da177e4
LT		 4330{
4331 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4332 u16 type;
4333
cb3b3152
JH		 4334 if (cmd_len != sizeof(*req))
4335 return -EPROTO;
4336
1da177e4
LT		 4337 type = __le16_to_cpu(req->type);
4338
4339 BT_DBG("type 0x%4.4x", type);
4340
f0709e03
MH		 4341 if (type == L2CAP_IT_FEAT_MASK) {
4342 u8 buf[8];
44dd46de 4343 u32 feat_mask = l2cap_feat_mask;
f0709e03 4344 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
dcf4adbf
JP		 4345 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4346 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4347 if (!disable_ertm)
fcc203c3 4348 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4349 | L2CAP_FEAT_FCS;
0bd49fc7 4350 if (conn->local_fixed_chan & L2CAP_FC_A2MP)
6327eb98 4351 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4352 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4353
1b7bf4ed 4354 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4355 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4356 buf);
e1027a7c
MH		 4357 } else if (type == L2CAP_IT_FIXED_CHAN) {
4358 u8 buf[12];
4359 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4360
dcf4adbf
JP		 4361 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4362 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
0bd49fc7
JH		 4363 rsp->data[0] = conn->local_fixed_chan;
4364 memset(rsp->data + 1, 0, 7);
2d792818
GP		 4365 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4366 buf);
f0709e03
MH		 4367 } else {
4368 struct l2cap_info_rsp rsp;
4369 rsp.type = cpu_to_le16(type);
dcf4adbf 4370 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4371 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4372 &rsp);
f0709e03 4373 }
1da177e4
LT		 4374
4375 return 0;
4376}
4377
2d792818 4378static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4379 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4380 u8 *data)
1da177e4
LT		 4381{
4382 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4383 u16 type, result;
4384
3f6fa3d4 4385 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4386 return -EPROTO;
4387
1da177e4
LT		 4388 type = __le16_to_cpu(rsp->type);
4389 result = __le16_to_cpu(rsp->result);
4390
4391 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4392
e90165be
AE		 4393 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4394 if (cmd->ident != conn->info_ident ||
2d792818 4395 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4396 return 0;
4397
17cd3f37 4398 cancel_delayed_work(&conn->info_timer);
4e8402a3 4399
adb08ede
VT		 4400 if (result != L2CAP_IR_SUCCESS) {
4401 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4402 conn->info_ident = 0;
4403
4404 l2cap_conn_start(conn);
4405
4406 return 0;
4407 }
4408
978c93b9
AE		 4409 switch (type) {
4410 case L2CAP_IT_FEAT_MASK:
83985319 4411 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4412
47ec1dcd 4413 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4414 struct l2cap_info_req req;
dcf4adbf 4415 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4416
4417 conn->info_ident = l2cap_get_ident(conn);
4418
4419 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4420 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4421 } else {
4422 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4423 conn->info_ident = 0;
4424
4425 l2cap_conn_start(conn);
4426 }
978c93b9
AE		 4427 break;
4428
4429 case L2CAP_IT_FIXED_CHAN:
0bd49fc7 4430 conn->remote_fixed_chan = rsp->data[0];
984947dc 4431 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4432 conn->info_ident = 0;
984947dc
MH		 4433
4434 l2cap_conn_start(conn);
978c93b9 4435 break;
984947dc 4436 }
4e8402a3 4437
1da177e4
LT		 4438 return 0;
4439}
4440
1700915f
MM		 4441static int l2cap_create_channel_req(struct l2cap_conn *conn,
4442 struct l2cap_cmd_hdr *cmd,
4443 u16 cmd_len, void *data)
f94ff6ff
MM		 4444{
4445 struct l2cap_create_chan_req *req = data;
6e1df6a6 4446 struct l2cap_create_chan_rsp rsp;
1700915f 4447 struct l2cap_chan *chan;
6e1df6a6 4448 struct hci_dev *hdev;
f94ff6ff
MM		 4449 u16 psm, scid;
4450
4451 if (cmd_len != sizeof(*req))
4452 return -EPROTO;
4453
0bd49fc7 4454 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
f94ff6ff
MM		 4455 return -EINVAL;
4456
4457 psm = le16_to_cpu(req->psm);
4458 scid = le16_to_cpu(req->scid);
4459
ad0ac6ca 4460 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4461
6e1df6a6 4462 /* For controller id 0 make BR/EDR connection */
6ed971ca 4463 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4464 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4465 req->amp_id);
4466 return 0;
4467 }
1700915f 4468
6e1df6a6
AE		 4469 /* Validate AMP controller id */
4470 hdev = hci_dev_get(req->amp_id);
4471 if (!hdev)
4472 goto error;
1700915f 4473
6e1df6a6
AE		 4474 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4475 hci_dev_put(hdev);
4476 goto error;
4477 }
1700915f 4478
6e1df6a6
AE		 4479 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4480 req->amp_id);
4481 if (chan) {
4482 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4483 struct hci_conn *hs_hcon;
1700915f 4484
98e0f7ea
MH		 4485 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4486 &conn->hcon->dst);
6e1df6a6
AE		 4487 if (!hs_hcon) {
4488 hci_dev_put(hdev);
662d652d
JH		 4489 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4490 chan->dcid);
4491 return 0;
1700915f
MM		 4492 }
4493
6e1df6a6
AE		 4494 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4495
6e1df6a6
AE		 4496 mgr->bredr_chan = chan;
4497 chan->hs_hcon = hs_hcon;
fd45bf4c 4498 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4499 conn->mtu = hdev->block_mtu;
1700915f 4500 }
f94ff6ff 4501
6e1df6a6 4502 hci_dev_put(hdev);
f94ff6ff
MM		 4503
4504 return 0;
6e1df6a6
AE		 4505
4506error:
4507 rsp.dcid = 0;
4508 rsp.scid = cpu_to_le16(scid);
dcf4adbf
JP		 4509 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4510 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
6e1df6a6
AE		 4511
4512 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4513 sizeof(rsp), &rsp);
4514
dc280801 4515 return 0;
f94ff6ff
MM		 4516}
4517
8eb200bd
MM		 4518static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4519{
4520 struct l2cap_move_chan_req req;
4521 u8 ident;
4522
4523 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4524
4525 ident = l2cap_get_ident(chan->conn);
4526 chan->ident = ident;
4527
4528 req.icid = cpu_to_le16(chan->scid);
4529 req.dest_amp_id = dest_amp_id;
4530
4531 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4532 &req);
4533
4534 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4535}
4536
1500109b 4537static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4538{
4539 struct l2cap_move_chan_rsp rsp;
4540
1500109b 4541 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4542
1500109b 4543 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4544 rsp.result = cpu_to_le16(result);
4545
1500109b
MM		 4546 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4547 sizeof(rsp), &rsp);
8d5a04a1
MM		 4548}
4549
5b155ef9 4550static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4551{
4552 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4553
5b155ef9 4554 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4555
5b155ef9 4556 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4557
5b155ef9 4558 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4559 cfm.result = cpu_to_le16(result);
4560
5b155ef9
MM		 4561 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4562 sizeof(cfm), &cfm);
4563
4564 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4565}
4566
4567static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4568{
4569 struct l2cap_move_chan_cfm cfm;
4570
4571 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4572
4573 cfm.icid = cpu_to_le16(icid);
dcf4adbf 4574 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
5b155ef9
MM		 4575
4576 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4577 sizeof(cfm), &cfm);
8d5a04a1
MM		 4578}
4579
4580static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4581 u16 icid)
8d5a04a1
MM		 4582{
4583 struct l2cap_move_chan_cfm_rsp rsp;
4584
ad0ac6ca 4585 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4586
4587 rsp.icid = cpu_to_le16(icid);
4588 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4589}
4590
5f3847a4
MM		 4591static void __release_logical_link(struct l2cap_chan *chan)
4592{
4593 chan->hs_hchan = NULL;
4594 chan->hs_hcon = NULL;
4595
4596 /* Placeholder - release the logical link */
4597}
4598
1500109b
MM		 4599static void l2cap_logical_fail(struct l2cap_chan *chan)
4600{
4601 /* Logical link setup failed */
4602 if (chan->state != BT_CONNECTED) {
4603 /* Create channel failure, disconnect */
5e4e3972 4604 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4605 return;
4606 }
4607
4608 switch (chan->move_role) {
4609 case L2CAP_MOVE_ROLE_RESPONDER:
4610 l2cap_move_done(chan);
4611 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4612 break;
4613 case L2CAP_MOVE_ROLE_INITIATOR:
4614 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4615 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4616 /* Remote has only sent pending or
4617 * success responses, clean up
4618 */
4619 l2cap_move_done(chan);
4620 }
4621
4622 /* Other amp move states imply that the move
4623 * has already aborted
4624 */
4625 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4626 break;
4627 }
4628}
4629
4630static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4631 struct hci_chan *hchan)
4632{
4633 struct l2cap_conf_rsp rsp;
1500109b 4634
336178a3 4635 chan->hs_hchan = hchan;
1500109b
MM		 4636 chan->hs_hcon->l2cap_data = chan->conn;
4637
35ba9561 4638 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4639
4640 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4641 int err;
1500109b
MM		 4642
4643 set_default_fcs(chan);
4644
4645 err = l2cap_ertm_init(chan);
4646 if (err < 0)
5e4e3972 4647 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4648 else
4649 l2cap_chan_ready(chan);
4650 }
4651}
4652
4653static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4654 struct hci_chan *hchan)
4655{
4656 chan->hs_hcon = hchan->conn;
4657 chan->hs_hcon->l2cap_data = chan->conn;
4658
4659 BT_DBG("move_state %d", chan->move_state);
4660
4661 switch (chan->move_state) {
4662 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4663 /* Move confirm will be sent after a success
4664 * response is received
4665 */
4666 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4667 break;
4668 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4669 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4670 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4671 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4672 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4673 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4674 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4675 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4676 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4677 }
4678 break;
4679 default:
4680 /* Move was not in expected state, free the channel */
4681 __release_logical_link(chan);
4682
4683 chan->move_state = L2CAP_MOVE_STABLE;
4684 }
4685}
4686
4687/* Call with chan locked */
27695fb4
AE		 4688void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4689 u8 status)
5b155ef9 4690{
1500109b
MM		 4691 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4692
4693 if (status) {
4694 l2cap_logical_fail(chan);
4695 __release_logical_link(chan);
4696 return;
4697 }
4698
4699 if (chan->state != BT_CONNECTED) {
4700 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4701 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4702 l2cap_logical_finish_create(chan, hchan);
4703 } else {
4704 l2cap_logical_finish_move(chan, hchan);
4705 }
5b155ef9
MM		 4706}
4707
3f7a56c4
MM		 4708void l2cap_move_start(struct l2cap_chan *chan)
4709{
4710 BT_DBG("chan %p", chan);
4711
6ed971ca 4712 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4713 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4714 return;
4715 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4716 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4717 /* Placeholder - start physical link setup */
4718 } else {
4719 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4720 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4721 chan->move_id = 0;
4722 l2cap_move_setup(chan);
4723 l2cap_send_move_chan_req(chan, 0);
4724 }
4725}
4726
8eb200bd
MM		 4727static void l2cap_do_create(struct l2cap_chan *chan, int result,
4728 u8 local_amp_id, u8 remote_amp_id)
4729{
62748ca1
AE		 4730 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4731 local_amp_id, remote_amp_id);
4732
12d6cc60
AE		 4733 chan->fcs = L2CAP_FCS_NONE;
4734
62748ca1
AE		 4735 /* Outgoing channel on AMP */
4736 if (chan->state == BT_CONNECT) {
4737 if (result == L2CAP_CR_SUCCESS) {
4738 chan->local_amp_id = local_amp_id;
4739 l2cap_send_create_chan_req(chan, remote_amp_id);
4740 } else {
4741 /* Revert to BR/EDR connect */
4742 l2cap_send_conn_req(chan);
4743 }
4744
4745 return;
4746 }
4747
4748 /* Incoming channel on AMP */
4749 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4750 struct l2cap_conn_rsp rsp;
4751 char buf[128];
4752 rsp.scid = cpu_to_le16(chan->dcid);
4753 rsp.dcid = cpu_to_le16(chan->scid);
4754
8eb200bd
MM		 4755 if (result == L2CAP_CR_SUCCESS) {
4756 /* Send successful response */
dcf4adbf
JP		 4757 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4758 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4759 } else {
4760 /* Send negative response */
dcf4adbf
JP		 4761 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4762 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4763 }
4764
4765 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4766 sizeof(rsp), &rsp);
4767
4768 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4769 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4770 set_bit(CONF_REQ_SENT, &chan->conf_state);
4771 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4772 L2CAP_CONF_REQ,
4773 l2cap_build_conf_req(chan, buf), buf);
4774 chan->num_conf_req++;
4775 }
8eb200bd
MM		 4776 }
4777}
4778
4779static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4780 u8 remote_amp_id)
4781{
4782 l2cap_move_setup(chan);
4783 chan->move_id = local_amp_id;
4784 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4785
4786 l2cap_send_move_chan_req(chan, remote_amp_id);
4787}
4788
4789static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4790{
4791 struct hci_chan *hchan = NULL;
4792
4793 /* Placeholder - get hci_chan for logical link */
4794
4795 if (hchan) {
4796 if (hchan->state == BT_CONNECTED) {
4797 /* Logical link is ready to go */
4798 chan->hs_hcon = hchan->conn;
4799 chan->hs_hcon->l2cap_data = chan->conn;
4800 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4801 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4802
4803 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4804 } else {
4805 /* Wait for logical link to be ready */
4806 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4807 }
4808 } else {
4809 /* Logical link not available */
4810 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4811 }
4812}
4813
4814static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4815{
4816 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4817 u8 rsp_result;
4818 if (result == -EINVAL)
4819 rsp_result = L2CAP_MR_BAD_ID;
4820 else
4821 rsp_result = L2CAP_MR_NOT_ALLOWED;
4822
4823 l2cap_send_move_chan_rsp(chan, rsp_result);
4824 }
4825
4826 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4827 chan->move_state = L2CAP_MOVE_STABLE;
4828
4829 /* Restart data transmission */
4830 l2cap_ertm_send(chan);
4831}
4832
a514b17f
AE		 4833/* Invoke with locked chan */
4834void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4835{
770bfefa 4836 u8 local_amp_id = chan->local_amp_id;
fffadc08 4837 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4838
8eb200bd
MM		 4839 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4840 chan, result, local_amp_id, remote_amp_id);
4841
8eb200bd
MM		 4842 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4843 l2cap_chan_unlock(chan);
4844 return;
4845 }
4846
4847 if (chan->state != BT_CONNECTED) {
4848 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4849 } else if (result != L2CAP_MR_SUCCESS) {
4850 l2cap_do_move_cancel(chan, result);
4851 } else {
4852 switch (chan->move_role) {
4853 case L2CAP_MOVE_ROLE_INITIATOR:
4854 l2cap_do_move_initiate(chan, local_amp_id,
4855 remote_amp_id);
4856 break;
4857 case L2CAP_MOVE_ROLE_RESPONDER:
4858 l2cap_do_move_respond(chan, result);
4859 break;
4860 default:
4861 l2cap_do_move_cancel(chan, result);
4862 break;
4863 }
4864 }
8eb200bd
MM		 4865}
4866
8d5a04a1 4867static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4868 struct l2cap_cmd_hdr *cmd,
4869 u16 cmd_len, void *data)
8d5a04a1
MM		 4870{
4871 struct l2cap_move_chan_req *req = data;
1500109b 4872 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4873 struct l2cap_chan *chan;
8d5a04a1
MM		 4874 u16 icid = 0;
4875 u16 result = L2CAP_MR_NOT_ALLOWED;
4876
4877 if (cmd_len != sizeof(*req))
4878 return -EPROTO;
4879
4880 icid = le16_to_cpu(req->icid);
4881
ad0ac6ca 4882 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4883
0bd49fc7 4884 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
8d5a04a1
MM		 4885 return -EINVAL;
4886
02b0fbb9
MM		 4887 chan = l2cap_get_chan_by_dcid(conn, icid);
4888 if (!chan) {
1500109b 4889 rsp.icid = cpu_to_le16(icid);
dcf4adbf 4890 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
1500109b
MM		 4891 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4892 sizeof(rsp), &rsp);
02b0fbb9
MM		 4893 return 0;
4894 }
4895
1500109b
MM		 4896 chan->ident = cmd->ident;
4897
02b0fbb9
MM		 4898 if (chan->scid < L2CAP_CID_DYN_START ||
4899 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4900 (chan->mode != L2CAP_MODE_ERTM &&
4901 chan->mode != L2CAP_MODE_STREAMING)) {
4902 result = L2CAP_MR_NOT_ALLOWED;
4903 goto send_move_response;
4904 }
4905
4906 if (chan->local_amp_id == req->dest_amp_id) {
4907 result = L2CAP_MR_SAME_ID;
4908 goto send_move_response;
4909 }
4910
6ed971ca 4911 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4912 struct hci_dev *hdev;
4913 hdev = hci_dev_get(req->dest_amp_id);
4914 if (!hdev || hdev->dev_type != HCI_AMP ||
4915 !test_bit(HCI_UP, &hdev->flags)) {
4916 if (hdev)
4917 hci_dev_put(hdev);
4918
4919 result = L2CAP_MR_BAD_ID;
4920 goto send_move_response;
4921 }
4922 hci_dev_put(hdev);
4923 }
4924
4925 /* Detect a move collision. Only send a collision response
4926 * if this side has "lost", otherwise proceed with the move.
4927 * The winner has the larger bd_addr.
4928 */
4929 if ((__chan_is_moving(chan) ||
4930 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4931 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4932 result = L2CAP_MR_COLLISION;
4933 goto send_move_response;
4934 }
4935
02b0fbb9
MM		 4936 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4937 l2cap_move_setup(chan);
4938 chan->move_id = req->dest_amp_id;
4939 icid = chan->dcid;
4940
6ed971ca 4941 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4942 /* Moving to BR/EDR */
4943 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4944 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4945 result = L2CAP_MR_PEND;
4946 } else {
4947 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4948 result = L2CAP_MR_SUCCESS;
4949 }
4950 } else {
4951 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4952 /* Placeholder - uncomment when amp functions are available */
4953 /*amp_accept_physical(chan, req->dest_amp_id);*/
4954 result = L2CAP_MR_PEND;
4955 }
4956
4957send_move_response:
1500109b 4958 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4959
02b0fbb9
MM		 4960 l2cap_chan_unlock(chan);
4961
8d5a04a1
MM		 4962 return 0;
4963}
4964
5b155ef9
MM		 4965static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4966{
4967 struct l2cap_chan *chan;
4968 struct hci_chan *hchan = NULL;
4969
4970 chan = l2cap_get_chan_by_scid(conn, icid);
4971 if (!chan) {
4972 l2cap_send_move_chan_cfm_icid(conn, icid);
4973 return;
4974 }
4975
4976 __clear_chan_timer(chan);
4977 if (result == L2CAP_MR_PEND)
4978 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4979
4980 switch (chan->move_state) {
4981 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4982 /* Move confirm will be sent when logical link
4983 * is complete.
4984 */
4985 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4986 break;
4987 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4988 if (result == L2CAP_MR_PEND) {
4989 break;
4990 } else if (test_bit(CONN_LOCAL_BUSY,
4991 &chan->conn_state)) {
4992 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4993 } else {
4994 /* Logical link is up or moving to BR/EDR,
4995 * proceed with move
4996 */
4997 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4998 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4999 }
5000 break;
5001 case L2CAP_MOVE_WAIT_RSP:
5002 /* Moving to AMP */
5003 if (result == L2CAP_MR_SUCCESS) {
5004 /* Remote is ready, send confirm immediately
5005 * after logical link is ready
5006 */
5007 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5008 } else {
5009 /* Both logical link and move success
5010 * are required to confirm
5011 */
5012 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5013 }
5014
5015 /* Placeholder - get hci_chan for logical link */
5016 if (!hchan) {
5017 /* Logical link not available */
5018 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5019 break;
5020 }
5021
5022 /* If the logical link is not yet connected, do not
5023 * send confirmation.
5024 */
5025 if (hchan->state != BT_CONNECTED)
5026 break;
5027
5028 /* Logical link is already ready to go */
5029
5030 chan->hs_hcon = hchan->conn;
5031 chan->hs_hcon->l2cap_data = chan->conn;
5032
5033 if (result == L2CAP_MR_SUCCESS) {
5034 /* Can confirm now */
5035 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5036 } else {
5037 /* Now only need move success
5038 * to confirm
5039 */
5040 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5041 }
5042
5043 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5044 break;
5045 default:
5046 /* Any other amp move state means the move failed. */
5047 chan->move_id = chan->local_amp_id;
5048 l2cap_move_done(chan);
5049 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5050 }
5051
5052 l2cap_chan_unlock(chan);
5053}
5054
5055static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5056 u16 result)
5057{
5058 struct l2cap_chan *chan;
5059
5060 chan = l2cap_get_chan_by_ident(conn, ident);
5061 if (!chan) {
5062 /* Could not locate channel, icid is best guess */
5063 l2cap_send_move_chan_cfm_icid(conn, icid);
5064 return;
5065 }
5066
5067 __clear_chan_timer(chan);
5068
5069 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5070 if (result == L2CAP_MR_COLLISION) {
5071 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5072 } else {
5073 /* Cleanup - cancel move */
5074 chan->move_id = chan->local_amp_id;
5075 l2cap_move_done(chan);
5076 }
5077 }
5078
5079 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5080
5081 l2cap_chan_unlock(chan);
5082}
5083
5084static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5085 struct l2cap_cmd_hdr *cmd,
5086 u16 cmd_len, void *data)
8d5a04a1
MM		 5087{
5088 struct l2cap_move_chan_rsp *rsp = data;
5089 u16 icid, result;
5090
5091 if (cmd_len != sizeof(*rsp))
5092 return -EPROTO;
5093
5094 icid = le16_to_cpu(rsp->icid);
5095 result = le16_to_cpu(rsp->result);
5096
ad0ac6ca 5097 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5098
5b155ef9
MM		 5099 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5100 l2cap_move_continue(conn, icid, result);
5101 else
5102 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5103
5104 return 0;
5105}
5106
5f3847a4
MM		 5107static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5108 struct l2cap_cmd_hdr *cmd,
5109 u16 cmd_len, void *data)
8d5a04a1
MM		 5110{
5111 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5112 struct l2cap_chan *chan;
8d5a04a1
MM		 5113 u16 icid, result;
5114
5115 if (cmd_len != sizeof(*cfm))
5116 return -EPROTO;
5117
5118 icid = le16_to_cpu(cfm->icid);
5119 result = le16_to_cpu(cfm->result);
5120
ad0ac6ca 5121 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5122
5f3847a4
MM		 5123 chan = l2cap_get_chan_by_dcid(conn, icid);
5124 if (!chan) {
5125 /* Spec requires a response even if the icid was not found */
5126 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5127 return 0;
5128 }
5129
5130 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5131 if (result == L2CAP_MC_CONFIRMED) {
5132 chan->local_amp_id = chan->move_id;
6ed971ca 5133 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5134 __release_logical_link(chan);
5135 } else {
5136 chan->move_id = chan->local_amp_id;
5137 }
5138
5139 l2cap_move_done(chan);
5140 }
5141
8d5a04a1
MM		 5142 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5143
5f3847a4
MM		 5144 l2cap_chan_unlock(chan);
5145
8d5a04a1
MM		 5146 return 0;
5147}
5148
5149static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5150 struct l2cap_cmd_hdr *cmd,
5151 u16 cmd_len, void *data)
8d5a04a1
MM		 5152{
5153 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5154 struct l2cap_chan *chan;
8d5a04a1
MM		 5155 u16 icid;
5156
5157 if (cmd_len != sizeof(*rsp))
5158 return -EPROTO;
5159
5160 icid = le16_to_cpu(rsp->icid);
5161
ad0ac6ca 5162 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5163
3fd71a0a
MM		 5164 chan = l2cap_get_chan_by_scid(conn, icid);
5165 if (!chan)
5166 return 0;
5167
5168 __clear_chan_timer(chan);
5169
5170 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5171 chan->local_amp_id = chan->move_id;
5172
6ed971ca 5173 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5174 __release_logical_link(chan);
5175
5176 l2cap_move_done(chan);
5177 }
5178
5179 l2cap_chan_unlock(chan);
5180
8d5a04a1
MM		 5181 return 0;
5182}
5183
de73115a 5184static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5185 struct l2cap_cmd_hdr *cmd,
203e639e 5186 u16 cmd_len, u8 *data)
de73115a
CT		 5187{
5188 struct hci_conn *hcon = conn->hcon;
5189 struct l2cap_conn_param_update_req *req;
5190 struct l2cap_conn_param_update_rsp rsp;
203e639e 5191 u16 min, max, latency, to_multiplier;
2ce603eb 5192 int err;
de73115a 5193
40bef302 5194 if (hcon->role != HCI_ROLE_MASTER)
de73115a
CT		 5195 return -EINVAL;
5196
de73115a
CT		 5197 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5198 return -EPROTO;
5199
5200 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5201 min = __le16_to_cpu(req->min);
5202 max = __le16_to_cpu(req->max);
de73115a
CT		 5203 latency = __le16_to_cpu(req->latency);
5204 to_multiplier = __le16_to_cpu(req->to_multiplier);
5205
5206 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5207 min, max, latency, to_multiplier);
de73115a
CT		 5208
5209 memset(&rsp, 0, sizeof(rsp));
2ce603eb 5210
d4905f24 5211 err = hci_check_conn_params(min, max, latency, to_multiplier);
2ce603eb 5212 if (err)
dcf4adbf 5213 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5214 else
dcf4adbf 5215 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5216
5217 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5218 sizeof(rsp), &rsp);
de73115a 5219
ffb5a827 5220 if (!err) {
f4869e2a
JH		 5221 u8 store_hint;
5222
5223 store_hint = hci_le_conn_update(hcon, min, max, latency,
5224 to_multiplier);
ffb5a827 5225 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
f4869e2a
JH		 5226 store_hint, min, max, latency,
5227 to_multiplier);
ffb5a827 5228
ffb5a827 5229 }
2ce603eb 5230
de73115a
CT		 5231 return 0;
5232}
5233
f1496dee
JH		 5234static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5235 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5236 u8 *data)
5237{
5238 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
3e64b7bd 5239 struct hci_conn *hcon = conn->hcon;
f1496dee
JH		 5240 u16 dcid, mtu, mps, credits, result;
5241 struct l2cap_chan *chan;
3e64b7bd 5242 int err, sec_level;
f1496dee
JH		 5243
5244 if (cmd_len < sizeof(*rsp))
5245 return -EPROTO;
5246
5247 dcid = __le16_to_cpu(rsp->dcid);
5248 mtu = __le16_to_cpu(rsp->mtu);
5249 mps = __le16_to_cpu(rsp->mps);
5250 credits = __le16_to_cpu(rsp->credits);
5251 result = __le16_to_cpu(rsp->result);
5252
5253 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5254 return -EPROTO;
5255
5256 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5257 dcid, mtu, mps, credits, result);
5258
5259 mutex_lock(&conn->chan_lock);
5260
5261 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5262 if (!chan) {
5263 err = -EBADSLT;
5264 goto unlock;
5265 }
5266
5267 err = 0;
5268
5269 l2cap_chan_lock(chan);
5270
5271 switch (result) {
5272 case L2CAP_CR_SUCCESS:
5273 chan->ident = 0;
5274 chan->dcid = dcid;
5275 chan->omtu = mtu;
5276 chan->remote_mps = mps;
0cd75f7e 5277 chan->tx_credits = credits;
f1496dee
JH		 5278 l2cap_chan_ready(chan);
5279 break;
5280
3e64b7bd
JH		 5281 case L2CAP_CR_AUTHENTICATION:
5282 case L2CAP_CR_ENCRYPTION:
5283 /* If we already have MITM protection we can't do
5284 * anything.
5285 */
5286 if (hcon->sec_level > BT_SECURITY_MEDIUM) {
5287 l2cap_chan_del(chan, ECONNREFUSED);
5288 break;
5289 }
5290
5291 sec_level = hcon->sec_level + 1;
5292 if (chan->sec_level < sec_level)
5293 chan->sec_level = sec_level;
5294
5295 /* We'll need to send a new Connect Request */
5296 clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags);
5297
5298 smp_conn_security(hcon, chan->sec_level);
5299 break;
5300
f1496dee
JH		 5301 default:
5302 l2cap_chan_del(chan, ECONNREFUSED);
5303 break;
5304 }
5305
5306 l2cap_chan_unlock(chan);
5307
5308unlock:
5309 mutex_unlock(&conn->chan_lock);
5310
5311 return err;
5312}
5313
3300d9a9 5314static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5315 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5316 u8 *data)
3300d9a9
CT		 5317{
5318 int err = 0;
5319
5320 switch (cmd->code) {
5321 case L2CAP_COMMAND_REJ:
cb3b3152 5322 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5323 break;
5324
5325 case L2CAP_CONN_REQ:
cb3b3152 5326 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5327 break;
5328
5329 case L2CAP_CONN_RSP:
f5a2598d 5330 case L2CAP_CREATE_CHAN_RSP:
9245e737 5331 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5332 break;
5333
5334 case L2CAP_CONF_REQ:
5335 err = l2cap_config_req(conn, cmd, cmd_len, data);
5336 break;
5337
5338 case L2CAP_CONF_RSP:
9245e737 5339 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5340 break;
5341
5342 case L2CAP_DISCONN_REQ:
cb3b3152 5343 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5344 break;
5345
5346 case L2CAP_DISCONN_RSP:
9245e737 5347 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5348 break;
5349
5350 case L2CAP_ECHO_REQ:
5351 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5352 break;
5353
5354 case L2CAP_ECHO_RSP:
5355 break;
5356
5357 case L2CAP_INFO_REQ:
cb3b3152 5358 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5359 break;
5360
5361 case L2CAP_INFO_RSP:
9245e737 5362 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5363 break;
5364
f94ff6ff
MM		 5365 case L2CAP_CREATE_CHAN_REQ:
5366 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5367 break;
5368
8d5a04a1
MM		 5369 case L2CAP_MOVE_CHAN_REQ:
5370 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5371 break;
5372
5373 case L2CAP_MOVE_CHAN_RSP:
9245e737 5374 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5375 break;
5376
5377 case L2CAP_MOVE_CHAN_CFM:
5378 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5379 break;
5380
5381 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5382 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5383 break;
5384
3300d9a9
CT		 5385 default:
5386 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5387 err = -EINVAL;
5388 break;
5389 }
5390
5391 return err;
5392}
5393
27e2d4c8
JH		 5394static int l2cap_le_connect_req(struct l2cap_conn *conn,
5395 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5396 u8 *data)
5397{
5398 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5399 struct l2cap_le_conn_rsp rsp;
5400 struct l2cap_chan *chan, *pchan;
0cd75f7e 5401 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5402 __le16 psm;
5403 u8 result;
5404
5405 if (cmd_len != sizeof(*req))
5406 return -EPROTO;
5407
5408 scid = __le16_to_cpu(req->scid);
5409 mtu = __le16_to_cpu(req->mtu);
5410 mps = __le16_to_cpu(req->mps);
5411 psm = req->psm;
5412 dcid = 0;
0cd75f7e 5413 credits = 0;
27e2d4c8
JH		 5414
5415 if (mtu < 23 || mps < 23)
5416 return -EPROTO;
5417
5418 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5419 scid, mtu, mps);
5420
5421 /* Check if we have socket listening on psm */
5422 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5423 &conn->hcon->dst, LE_LINK);
5424 if (!pchan) {
5425 result = L2CAP_CR_BAD_PSM;
5426 chan = NULL;
5427 goto response;
5428 }
5429
5430 mutex_lock(&conn->chan_lock);
5431 l2cap_chan_lock(pchan);
5432
35dc6f83
JH		 5433 if (!smp_sufficient_security(conn->hcon, pchan->sec_level,
5434 SMP_ALLOW_STK)) {
27e2d4c8
JH		 5435 result = L2CAP_CR_AUTHENTICATION;
5436 chan = NULL;
5437 goto response_unlock;
5438 }
5439
8a7889cc
JH		 5440 /* Check for valid dynamic CID range */
5441 if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) {
5442 result = L2CAP_CR_INVALID_SCID;
5443 chan = NULL;
5444 goto response_unlock;
5445 }
5446
27e2d4c8
JH		 5447 /* Check if we already have channel with that dcid */
5448 if (__l2cap_get_chan_by_dcid(conn, scid)) {
8a7889cc 5449 result = L2CAP_CR_SCID_IN_USE;
27e2d4c8
JH		 5450 chan = NULL;
5451 goto response_unlock;
5452 }
5453
5454 chan = pchan->ops->new_connection(pchan);
5455 if (!chan) {
5456 result = L2CAP_CR_NO_MEM;
5457 goto response_unlock;
5458 }
5459
0ce43ce6
JH		 5460 l2cap_le_flowctl_init(chan);
5461
27e2d4c8
JH		 5462 bacpy(&chan->src, &conn->hcon->src);
5463 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 5464 chan->src_type = bdaddr_src_type(conn->hcon);
5465 chan->dst_type = bdaddr_dst_type(conn->hcon);
27e2d4c8
JH		 5466 chan->psm = psm;
5467 chan->dcid = scid;
5468 chan->omtu = mtu;
5469 chan->remote_mps = mps;
0cd75f7e 5470 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5471
5472 __l2cap_chan_add(conn, chan);
5473 dcid = chan->scid;
0cd75f7e 5474 credits = chan->rx_credits;
27e2d4c8
JH		 5475
5476 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5477
5478 chan->ident = cmd->ident;
5479
5480 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5481 l2cap_state_change(chan, BT_CONNECT2);
434714dc
JH		 5482 /* The following result value is actually not defined
5483 * for LE CoC but we use it to let the function know
5484 * that it should bail out after doing its cleanup
5485 * instead of sending a response.
5486 */
27e2d4c8
JH		 5487 result = L2CAP_CR_PEND;
5488 chan->ops->defer(chan);
5489 } else {
5490 l2cap_chan_ready(chan);
5491 result = L2CAP_CR_SUCCESS;
5492 }
5493
5494response_unlock:
5495 l2cap_chan_unlock(pchan);
5496 mutex_unlock(&conn->chan_lock);
a24cce14 5497 l2cap_chan_put(pchan);
27e2d4c8
JH		 5498
5499 if (result == L2CAP_CR_PEND)
5500 return 0;
5501
5502response:
5503 if (chan) {
5504 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5505 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5506 } else {
5507 rsp.mtu = 0;
5508 rsp.mps = 0;
5509 }
5510
5511 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5512 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5513 rsp.result = cpu_to_le16(result);
5514
5515 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5516
5517 return 0;
5518}
5519
fad5fc89
JH		 5520static inline int l2cap_le_credits(struct l2cap_conn *conn,
5521 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5522 u8 *data)
5523{
5524 struct l2cap_le_credits *pkt;
5525 struct l2cap_chan *chan;
0f1bfe4e 5526 u16 cid, credits, max_credits;
fad5fc89
JH		 5527
5528 if (cmd_len != sizeof(*pkt))
5529 return -EPROTO;
5530
5531 pkt = (struct l2cap_le_credits *) data;
5532 cid = __le16_to_cpu(pkt->cid);
5533 credits = __le16_to_cpu(pkt->credits);
5534
5535 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5536
5537 chan = l2cap_get_chan_by_dcid(conn, cid);
5538 if (!chan)
5539 return -EBADSLT;
5540
0f1bfe4e
JH		 5541 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5542 if (credits > max_credits) {
5543 BT_ERR("LE credits overflow");
5544 l2cap_send_disconn_req(chan, ECONNRESET);
ee93053d 5545 l2cap_chan_unlock(chan);
0f1bfe4e
JH		 5546
5547 /* Return 0 so that we don't trigger an unnecessary
5548 * command reject packet.
5549 */
5550 return 0;
5551 }
5552
fad5fc89
JH		 5553 chan->tx_credits += credits;
5554
5555 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5556 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5557 chan->tx_credits--;
5558 }
5559
5560 if (chan->tx_credits)
5561 chan->ops->resume(chan);
5562
5563 l2cap_chan_unlock(chan);
5564
5565 return 0;
5566}
5567
71fb4197
JH		 5568static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5569 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5570 u8 *data)
5571{
5572 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5573 struct l2cap_chan *chan;
5574
5575 if (cmd_len < sizeof(*rej))
5576 return -EPROTO;
5577
5578 mutex_lock(&conn->chan_lock);
5579
5580 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5581 if (!chan)
5582 goto done;
5583
5584 l2cap_chan_lock(chan);
5585 l2cap_chan_del(chan, ECONNREFUSED);
5586 l2cap_chan_unlock(chan);
5587
5588done:
5589 mutex_unlock(&conn->chan_lock);
5590 return 0;
5591}
5592
3300d9a9 5593static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5594 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5595 u8 *data)
3300d9a9 5596{
b5ecba64
JH		 5597 int err = 0;
5598
3300d9a9
CT		 5599 switch (cmd->code) {
5600 case L2CAP_COMMAND_REJ:
71fb4197 5601 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5602 break;
3300d9a9
CT		 5603
5604 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5605 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5606 break;
3300d9a9
CT		 5607
5608 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5609 break;
3300d9a9 5610
f1496dee
JH		 5611 case L2CAP_LE_CONN_RSP:
5612 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5613 break;
f1496dee 5614
27e2d4c8 5615 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5616 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5617 break;
27e2d4c8 5618
fad5fc89
JH		 5619 case L2CAP_LE_CREDITS:
5620 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5621 break;
5622
3defe01a 5623 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5624 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5625 break;
3defe01a
JH		 5626
5627 case L2CAP_DISCONN_RSP:
5628 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5629 break;
3defe01a 5630
3300d9a9
CT		 5631 default:
5632 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5633 err = -EINVAL;
5634 break;
3300d9a9 5635 }
b5ecba64
JH		 5636
5637 return err;
3300d9a9
CT		 5638}
5639
c5623556
JH		 5640static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5641 struct sk_buff *skb)
5642{
69c4e4e8 5643 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5644 struct l2cap_cmd_hdr *cmd;
5645 u16 len;
c5623556
JH		 5646 int err;
5647
69c4e4e8 5648 if (hcon->type != LE_LINK)
3b166295 5649 goto drop;
69c4e4e8 5650
4f3e219d
MH		 5651 if (skb->len < L2CAP_CMD_HDR_SIZE)
5652 goto drop;
c5623556 5653
4f3e219d
MH		 5654 cmd = (void *) skb->data;
5655 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5656
4f3e219d 5657 len = le16_to_cpu(cmd->len);
c5623556 5658
4f3e219d 5659 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5660
4f3e219d
MH		 5661 if (len != skb->len || !cmd->ident) {
5662 BT_DBG("corrupted command");
5663 goto drop;
5664 }
c5623556 5665
203e639e 5666 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5667 if (err) {
5668 struct l2cap_cmd_rej_unk rej;
c5623556 5669
4f3e219d 5670 BT_ERR("Wrong link type (%d)", err);
c5623556 5671
dcf4adbf 5672 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5673 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5674 sizeof(rej), &rej);
c5623556
JH		 5675 }
5676
3b166295 5677drop:
c5623556
JH		 5678 kfree_skb(skb);
5679}
5680
3300d9a9 5681static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5682 struct sk_buff *skb)
1da177e4 5683{
69c4e4e8 5684 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5685 u8 *data = skb->data;
5686 int len = skb->len;
5687 struct l2cap_cmd_hdr cmd;
3300d9a9 5688 int err;
1da177e4
LT		 5689
5690 l2cap_raw_recv(conn, skb);
5691
69c4e4e8 5692 if (hcon->type != ACL_LINK)
3b166295 5693 goto drop;
69c4e4e8 5694
1da177e4 5695 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5696 u16 cmd_len;
1da177e4
LT		 5697 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5698 data += L2CAP_CMD_HDR_SIZE;
5699 len -= L2CAP_CMD_HDR_SIZE;
5700
88219a0f 5701 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5702
2d792818
GP		 5703 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5704 cmd.ident);
1da177e4 5705
88219a0f 5706 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5707 BT_DBG("corrupted command");
5708 break;
5709 }
5710
c5623556 5711 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5712 if (err) {
e2fd318e 5713 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5714
5715 BT_ERR("Wrong link type (%d)", err);
1da177e4 5716
dcf4adbf 5717 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5718 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5719 sizeof(rej), &rej);
1da177e4
LT		 5720 }
5721
88219a0f
AV		 5722 data += cmd_len;
5723 len -= cmd_len;
1da177e4
LT		 5724 }
5725
3b166295 5726drop:
1da177e4
LT		 5727 kfree_skb(skb);
5728}
5729
47d1ec61 5730static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5731{
5732 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5733 int hdr_size;
5734
5735 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5736 hdr_size = L2CAP_EXT_HDR_SIZE;
5737 else
5738 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5739
47d1ec61 5740 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5741 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5742 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5743 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5744
5745 if (our_fcs != rcv_fcs)
7a560e5c 5746 return -EBADMSG;
fcc203c3
GP		 5747 }
5748 return 0;
5749}
5750
6ea00485 5751static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5752{
e31f7633 5753 struct l2cap_ctrl control;
d5392c8f 5754
e31f7633 5755 BT_DBG("chan %p", chan);
d5392c8f 5756
e31f7633
MM		 5757 memset(&control, 0, sizeof(control));
5758 control.sframe = 1;
5759 control.final = 1;
5760 control.reqseq = chan->buffer_seq;
5761 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5762
e2ab4353 5763 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5764 control.super = L2CAP_SUPER_RNR;
5765 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5766 }
5767
e31f7633
MM		 5768 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5769 chan->unacked_frames > 0)
5770 __set_retrans_timer(chan);
d5392c8f 5771
e31f7633 5772 /* Send pending iframes */
525cd185 5773 l2cap_ertm_send(chan);
d5392c8f 5774
e2ab4353 5775 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5776 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5777 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5778 * send it now.
5779 */
5780 control.super = L2CAP_SUPER_RR;
5781 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5782 }
5783}
5784
2d792818
GP		 5785static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5786 struct sk_buff **last_frag)
18778a63 5787{
84084a31
MM		 5788 /* skb->len reflects data in skb as well as all fragments
5789 * skb->data_len reflects only data in fragments
5790 */
5791 if (!skb_has_frag_list(skb))
5792 skb_shinfo(skb)->frag_list = new_frag;
5793
5794 new_frag->next = NULL;
5795
5796 (*last_frag)->next = new_frag;
5797 *last_frag = new_frag;
5798
5799 skb->len += new_frag->len;
5800 skb->data_len += new_frag->len;
5801 skb->truesize += new_frag->truesize;
5802}
5803
4b51dae9
MM		 5804static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5805 struct l2cap_ctrl *control)
84084a31
MM		 5806{
5807 int err = -EINVAL;
18778a63 5808
4b51dae9 5809 switch (control->sar) {
7e0ef6ee 5810 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5811 if (chan->sdu)
5812 break;
18778a63 5813
80b98027 5814 err = chan->ops->recv(chan, skb);
84084a31 5815 break;
18778a63 5816
7e0ef6ee 5817 case L2CAP_SAR_START:
84084a31
MM		 5818 if (chan->sdu)
5819 break;
18778a63 5820
6f61fd47 5821 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5822 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5823
84084a31
MM		 5824 if (chan->sdu_len > chan->imtu) {
5825 err = -EMSGSIZE;
5826 break;
5827 }
1890d36b 5828
84084a31
MM		 5829 if (skb->len >= chan->sdu_len)
5830 break;
18778a63 5831
84084a31
MM		 5832 chan->sdu = skb;
5833 chan->sdu_last_frag = skb;
18778a63 5834
84084a31
MM		 5835 skb = NULL;
5836 err = 0;
18778a63
GP		 5837 break;
5838
7e0ef6ee 5839 case L2CAP_SAR_CONTINUE:
6f61fd47 5840 if (!chan->sdu)
84084a31 5841 break;
18778a63 5842
84084a31
MM		 5843 append_skb_frag(chan->sdu, skb,
5844 &chan->sdu_last_frag);
5845 skb = NULL;
18778a63 5846
84084a31
MM		 5847 if (chan->sdu->len >= chan->sdu_len)
5848 break;
4178ba46 5849
84084a31 5850 err = 0;
18778a63
GP		 5851 break;
5852
7e0ef6ee 5853 case L2CAP_SAR_END:
6f61fd47 5854 if (!chan->sdu)
84084a31 5855 break;
18778a63 5856
84084a31
MM		 5857 append_skb_frag(chan->sdu, skb,
5858 &chan->sdu_last_frag);
5859 skb = NULL;
4178ba46 5860
84084a31
MM		 5861 if (chan->sdu->len != chan->sdu_len)
5862 break;
18778a63 5863
80b98027 5864 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5865
84084a31
MM		 5866 if (!err) {
5867 /* Reassembly complete */
5868 chan->sdu = NULL;
5869 chan->sdu_last_frag = NULL;
5870 chan->sdu_len = 0;
1890d36b 5871 }
18778a63
GP		 5872 break;
5873 }
5874
84084a31
MM		 5875 if (err) {
5876 kfree_skb(skb);
5877 kfree_skb(chan->sdu);
5878 chan->sdu = NULL;
5879 chan->sdu_last_frag = NULL;
5880 chan->sdu_len = 0;
5881 }
18778a63 5882
84084a31 5883 return err;
18778a63
GP		 5884}
5885
32b32735
MM		 5886static int l2cap_resegment(struct l2cap_chan *chan)
5887{
5888 /* Placeholder */
5889 return 0;
5890}
5891
61aa4f5b 5892void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5893{
61aa4f5b 5894 u8 event;
712132eb 5895
61aa4f5b
MM		 5896 if (chan->mode != L2CAP_MODE_ERTM)
5897 return;
712132eb 5898
61aa4f5b 5899 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5900 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5901}
5902
d2a7ac5d
MM		 5903static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5904{
63838725
MM		 5905 int err = 0;
5906 /* Pass sequential frames to l2cap_reassemble_sdu()
5907 * until a gap is encountered.
5908 */
5909
5910 BT_DBG("chan %p", chan);
5911
5912 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5913 struct sk_buff *skb;
5914 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5915 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5916
5917 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5918
5919 if (!skb)
5920 break;
5921
5922 skb_unlink(skb, &chan->srej_q);
5923 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
a4368ff3 5924 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->l2cap);
63838725
MM		 5925 if (err)
5926 break;
5927 }
5928
5929 if (skb_queue_empty(&chan->srej_q)) {
5930 chan->rx_state = L2CAP_RX_STATE_RECV;
5931 l2cap_send_ack(chan);
5932 }
5933
5934 return err;
d2a7ac5d
MM		 5935}
5936
5937static void l2cap_handle_srej(struct l2cap_chan *chan,
5938 struct l2cap_ctrl *control)
5939{
f80842a8
MM		 5940 struct sk_buff *skb;
5941
5942 BT_DBG("chan %p, control %p", chan, control);
5943
5944 if (control->reqseq == chan->next_tx_seq) {
5945 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5946 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5947 return;
5948 }
5949
5950 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5951
5952 if (skb == NULL) {
5953 BT_DBG("Seq %d not available for retransmission",
5954 control->reqseq);
5955 return;
5956 }
5957
a4368ff3 5958 if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) {
f80842a8 5959 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5960 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5961 return;
5962 }
5963
5964 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5965
5966 if (control->poll) {
5967 l2cap_pass_to_tx(chan, control);
5968
5969 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5970 l2cap_retransmit(chan, control);
5971 l2cap_ertm_send(chan);
5972
5973 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5974 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5975 chan->srej_save_reqseq = control->reqseq;
5976 }
5977 } else {
5978 l2cap_pass_to_tx_fbit(chan, control);
5979
5980 if (control->final) {
5981 if (chan->srej_save_reqseq != control->reqseq ||
5982 !test_and_clear_bit(CONN_SREJ_ACT,
5983 &chan->conn_state))
5984 l2cap_retransmit(chan, control);
5985 } else {
5986 l2cap_retransmit(chan, control);
5987 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5988 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5989 chan->srej_save_reqseq = control->reqseq;
5990 }
5991 }
5992 }
d2a7ac5d
MM		 5993}
5994
5995static void l2cap_handle_rej(struct l2cap_chan *chan,
5996 struct l2cap_ctrl *control)
5997{
fcd289df
MM		 5998 struct sk_buff *skb;
5999
6000 BT_DBG("chan %p, control %p", chan, control);
6001
6002 if (control->reqseq == chan->next_tx_seq) {
6003 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 6004 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6005 return;
6006 }
6007
6008 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
6009
6010 if (chan->max_tx && skb &&
a4368ff3 6011 bt_cb(skb)->l2cap.retries >= chan->max_tx) {
fcd289df 6012 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 6013 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6014 return;
6015 }
6016
6017 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6018
6019 l2cap_pass_to_tx(chan, control);
6020
6021 if (control->final) {
6022 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6023 l2cap_retransmit_all(chan, control);
6024 } else {
6025 l2cap_retransmit_all(chan, control);
6026 l2cap_ertm_send(chan);
6027 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6028 set_bit(CONN_REJ_ACT, &chan->conn_state);
6029 }
d2a7ac5d
MM		 6030}
6031
4b51dae9
MM		 6032static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6033{
6034 BT_DBG("chan %p, txseq %d", chan, txseq);
6035
6036 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6037 chan->expected_tx_seq);
6038
6039 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6040 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 6041 chan->tx_win) {
4b51dae9
MM		 6042 /* See notes below regarding "double poll" and
6043 * invalid packets.
6044 */
6045 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6046 BT_DBG("Invalid/Ignore - after SREJ");
6047 return L2CAP_TXSEQ_INVALID_IGNORE;
6048 } else {
6049 BT_DBG("Invalid - in window after SREJ sent");
6050 return L2CAP_TXSEQ_INVALID;
6051 }
6052 }
6053
6054 if (chan->srej_list.head == txseq) {
6055 BT_DBG("Expected SREJ");
6056 return L2CAP_TXSEQ_EXPECTED_SREJ;
6057 }
6058
6059 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6060 BT_DBG("Duplicate SREJ - txseq already stored");
6061 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6062 }
6063
6064 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6065 BT_DBG("Unexpected SREJ - not requested");
6066 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6067 }
6068 }
6069
6070 if (chan->expected_tx_seq == txseq) {
6071 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6072 chan->tx_win) {
6073 BT_DBG("Invalid - txseq outside tx window");
6074 return L2CAP_TXSEQ_INVALID;
6075 } else {
6076 BT_DBG("Expected");
6077 return L2CAP_TXSEQ_EXPECTED;
6078 }
6079 }
6080
6081 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6082 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6083 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6084 return L2CAP_TXSEQ_DUPLICATE;
6085 }
6086
6087 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6088 /* A source of invalid packets is a "double poll" condition,
6089 * where delays cause us to send multiple poll packets. If
6090 * the remote stack receives and processes both polls,
6091 * sequence numbers can wrap around in such a way that a
6092 * resent frame has a sequence number that looks like new data
6093 * with a sequence gap. This would trigger an erroneous SREJ
6094 * request.
6095 *
6096 * Fortunately, this is impossible with a tx window that's
6097 * less than half of the maximum sequence number, which allows
6098 * invalid frames to be safely ignored.
6099 *
6100 * With tx window sizes greater than half of the tx window
6101 * maximum, the frame is invalid and cannot be ignored. This
6102 * causes a disconnect.
6103 */
6104
6105 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6106 BT_DBG("Invalid/Ignore - txseq outside tx window");
6107 return L2CAP_TXSEQ_INVALID_IGNORE;
6108 } else {
6109 BT_DBG("Invalid - txseq outside tx window");
6110 return L2CAP_TXSEQ_INVALID;
6111 }
6112 } else {
6113 BT_DBG("Unexpected - txseq indicates missing frames");
6114 return L2CAP_TXSEQ_UNEXPECTED;
6115 }
6116}
6117
d2a7ac5d
MM		 6118static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6119 struct l2cap_ctrl *control,
6120 struct sk_buff *skb, u8 event)
6121{
6122 int err = 0;
941247f9 6123 bool skb_in_use = false;
d2a7ac5d
MM		 6124
6125 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6126 event);
6127
6128 switch (event) {
6129 case L2CAP_EV_RECV_IFRAME:
6130 switch (l2cap_classify_txseq(chan, control->txseq)) {
6131 case L2CAP_TXSEQ_EXPECTED:
6132 l2cap_pass_to_tx(chan, control);
6133
6134 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6135 BT_DBG("Busy, discarding expected seq %d",
6136 control->txseq);
6137 break;
6138 }
6139
6140 chan->expected_tx_seq = __next_seq(chan,
6141 control->txseq);
6142
6143 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6144 skb_in_use = true;
d2a7ac5d
MM		 6145
6146 err = l2cap_reassemble_sdu(chan, skb, control);
6147 if (err)
6148 break;
6149
6150 if (control->final) {
6151 if (!test_and_clear_bit(CONN_REJ_ACT,
6152 &chan->conn_state)) {
6153 control->final = 0;
6154 l2cap_retransmit_all(chan, control);
6155 l2cap_ertm_send(chan);
6156 }
6157 }
6158
6159 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6160 l2cap_send_ack(chan);
6161 break;
6162 case L2CAP_TXSEQ_UNEXPECTED:
6163 l2cap_pass_to_tx(chan, control);
6164
6165 /* Can't issue SREJ frames in the local busy state.
6166 * Drop this frame, it will be seen as missing
6167 * when local busy is exited.
6168 */
6169 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6170 BT_DBG("Busy, discarding unexpected seq %d",
6171 control->txseq);
6172 break;
6173 }
6174
6175 /* There was a gap in the sequence, so an SREJ
6176 * must be sent for each missing frame. The
6177 * current frame is stored for later use.
6178 */
6179 skb_queue_tail(&chan->srej_q, skb);
941247f9 6180 skb_in_use = true;
d2a7ac5d
MM		 6181 BT_DBG("Queued %p (queue len %d)", skb,
6182 skb_queue_len(&chan->srej_q));
6183
6184 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6185 l2cap_seq_list_clear(&chan->srej_list);
6186 l2cap_send_srej(chan, control->txseq);
6187
6188 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6189 break;
6190 case L2CAP_TXSEQ_DUPLICATE:
6191 l2cap_pass_to_tx(chan, control);
6192 break;
6193 case L2CAP_TXSEQ_INVALID_IGNORE:
6194 break;
6195 case L2CAP_TXSEQ_INVALID:
6196 default:
5e4e3972 6197 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6198 break;
6199 }
6200 break;
6201 case L2CAP_EV_RECV_RR:
6202 l2cap_pass_to_tx(chan, control);
6203 if (control->final) {
6204 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6205
e6a3ee6e
MM		 6206 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6207 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6208 control->final = 0;
6209 l2cap_retransmit_all(chan, control);
6210 }
6211
6212 l2cap_ertm_send(chan);
6213 } else if (control->poll) {
6214 l2cap_send_i_or_rr_or_rnr(chan);
6215 } else {
6216 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6217 &chan->conn_state) &&
6218 chan->unacked_frames)
6219 __set_retrans_timer(chan);
6220
6221 l2cap_ertm_send(chan);
6222 }
6223 break;
6224 case L2CAP_EV_RECV_RNR:
6225 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6226 l2cap_pass_to_tx(chan, control);
6227 if (control && control->poll) {
6228 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6229 l2cap_send_rr_or_rnr(chan, 0);
6230 }
6231 __clear_retrans_timer(chan);
6232 l2cap_seq_list_clear(&chan->retrans_list);
6233 break;
6234 case L2CAP_EV_RECV_REJ:
6235 l2cap_handle_rej(chan, control);
6236 break;
6237 case L2CAP_EV_RECV_SREJ:
6238 l2cap_handle_srej(chan, control);
6239 break;
6240 default:
6241 break;
6242 }
6243
6244 if (skb && !skb_in_use) {
6245 BT_DBG("Freeing %p", skb);
6246 kfree_skb(skb);
6247 }
6248
6249 return err;
6250}
6251
6252static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6253 struct l2cap_ctrl *control,
6254 struct sk_buff *skb, u8 event)
6255{
6256 int err = 0;
6257 u16 txseq = control->txseq;
941247f9 6258 bool skb_in_use = false;
d2a7ac5d
MM		 6259
6260 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6261 event);
6262
6263 switch (event) {
6264 case L2CAP_EV_RECV_IFRAME:
6265 switch (l2cap_classify_txseq(chan, txseq)) {
6266 case L2CAP_TXSEQ_EXPECTED:
6267 /* Keep frame for reassembly later */
6268 l2cap_pass_to_tx(chan, control);
6269 skb_queue_tail(&chan->srej_q, skb);
941247f9 6270 skb_in_use = true;
d2a7ac5d
MM		 6271 BT_DBG("Queued %p (queue len %d)", skb,
6272 skb_queue_len(&chan->srej_q));
6273
6274 chan->expected_tx_seq = __next_seq(chan, txseq);
6275 break;
6276 case L2CAP_TXSEQ_EXPECTED_SREJ:
6277 l2cap_seq_list_pop(&chan->srej_list);
6278
6279 l2cap_pass_to_tx(chan, control);
6280 skb_queue_tail(&chan->srej_q, skb);
941247f9 6281 skb_in_use = true;
d2a7ac5d
MM		 6282 BT_DBG("Queued %p (queue len %d)", skb,
6283 skb_queue_len(&chan->srej_q));
6284
6285 err = l2cap_rx_queued_iframes(chan);
6286 if (err)
6287 break;
6288
6289 break;
6290 case L2CAP_TXSEQ_UNEXPECTED:
6291 /* Got a frame that can't be reassembled yet.
6292 * Save it for later, and send SREJs to cover
6293 * the missing frames.
6294 */
6295 skb_queue_tail(&chan->srej_q, skb);
941247f9 6296 skb_in_use = true;
d2a7ac5d
MM		 6297 BT_DBG("Queued %p (queue len %d)", skb,
6298 skb_queue_len(&chan->srej_q));
6299
6300 l2cap_pass_to_tx(chan, control);
6301 l2cap_send_srej(chan, control->txseq);
6302 break;
6303 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6304 /* This frame was requested with an SREJ, but
6305 * some expected retransmitted frames are
6306 * missing. Request retransmission of missing
6307 * SREJ'd frames.
6308 */
6309 skb_queue_tail(&chan->srej_q, skb);
941247f9 6310 skb_in_use = true;
d2a7ac5d
MM		 6311 BT_DBG("Queued %p (queue len %d)", skb,
6312 skb_queue_len(&chan->srej_q));
6313
6314 l2cap_pass_to_tx(chan, control);
6315 l2cap_send_srej_list(chan, control->txseq);
6316 break;
6317 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6318 /* We've already queued this frame. Drop this copy. */
6319 l2cap_pass_to_tx(chan, control);
6320 break;
6321 case L2CAP_TXSEQ_DUPLICATE:
6322 /* Expecting a later sequence number, so this frame
6323 * was already received. Ignore it completely.
6324 */
6325 break;
6326 case L2CAP_TXSEQ_INVALID_IGNORE:
6327 break;
6328 case L2CAP_TXSEQ_INVALID:
6329 default:
5e4e3972 6330 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6331 break;
6332 }
6333 break;
6334 case L2CAP_EV_RECV_RR:
6335 l2cap_pass_to_tx(chan, control);
6336 if (control->final) {
6337 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6338
6339 if (!test_and_clear_bit(CONN_REJ_ACT,
6340 &chan->conn_state)) {
6341 control->final = 0;
6342 l2cap_retransmit_all(chan, control);
6343 }
6344
6345 l2cap_ertm_send(chan);
6346 } else if (control->poll) {
6347 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6348 &chan->conn_state) &&
6349 chan->unacked_frames) {
6350 __set_retrans_timer(chan);
6351 }
6352
6353 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6354 l2cap_send_srej_tail(chan);
6355 } else {
6356 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6357 &chan->conn_state) &&
6358 chan->unacked_frames)
6359 __set_retrans_timer(chan);
6360
6361 l2cap_send_ack(chan);
6362 }
6363 break;
6364 case L2CAP_EV_RECV_RNR:
6365 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6366 l2cap_pass_to_tx(chan, control);
6367 if (control->poll) {
6368 l2cap_send_srej_tail(chan);
6369 } else {
6370 struct l2cap_ctrl rr_control;
6371 memset(&rr_control, 0, sizeof(rr_control));
6372 rr_control.sframe = 1;
6373 rr_control.super = L2CAP_SUPER_RR;
6374 rr_control.reqseq = chan->buffer_seq;
6375 l2cap_send_sframe(chan, &rr_control);
6376 }
6377
6378 break;
6379 case L2CAP_EV_RECV_REJ:
6380 l2cap_handle_rej(chan, control);
6381 break;
6382 case L2CAP_EV_RECV_SREJ:
6383 l2cap_handle_srej(chan, control);
6384 break;
6385 }
6386
6387 if (skb && !skb_in_use) {
6388 BT_DBG("Freeing %p", skb);
6389 kfree_skb(skb);
6390 }
6391
6392 return err;
6393}
6394
32b32735
MM		 6395static int l2cap_finish_move(struct l2cap_chan *chan)
6396{
6397 BT_DBG("chan %p", chan);
6398
6399 chan->rx_state = L2CAP_RX_STATE_RECV;
6400
6401 if (chan->hs_hcon)
6402 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6403 else
6404 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6405
6406 return l2cap_resegment(chan);
6407}
6408
6409static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6410 struct l2cap_ctrl *control,
6411 struct sk_buff *skb, u8 event)
6412{
6413 int err;
6414
6415 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6416 event);
6417
6418 if (!control->poll)
6419 return -EPROTO;
6420
6421 l2cap_process_reqseq(chan, control->reqseq);
6422
6423 if (!skb_queue_empty(&chan->tx_q))
6424 chan->tx_send_head = skb_peek(&chan->tx_q);
6425 else
6426 chan->tx_send_head = NULL;
6427
6428 /* Rewind next_tx_seq to the point expected
6429 * by the receiver.
6430 */
6431 chan->next_tx_seq = control->reqseq;
6432 chan->unacked_frames = 0;
6433
6434 err = l2cap_finish_move(chan);
6435 if (err)
6436 return err;
6437
6438 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6439 l2cap_send_i_or_rr_or_rnr(chan);
6440
6441 if (event == L2CAP_EV_RECV_IFRAME)
6442 return -EPROTO;
6443
6444 return l2cap_rx_state_recv(chan, control, NULL, event);
6445}
6446
6447static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6448 struct l2cap_ctrl *control,
6449 struct sk_buff *skb, u8 event)
6450{
6451 int err;
6452
6453 if (!control->final)
6454 return -EPROTO;
6455
6456 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6457
6458 chan->rx_state = L2CAP_RX_STATE_RECV;
6459 l2cap_process_reqseq(chan, control->reqseq);
6460
6461 if (!skb_queue_empty(&chan->tx_q))
6462 chan->tx_send_head = skb_peek(&chan->tx_q);
6463 else
6464 chan->tx_send_head = NULL;
6465
6466 /* Rewind next_tx_seq to the point expected
6467 * by the receiver.
6468 */
6469 chan->next_tx_seq = control->reqseq;
6470 chan->unacked_frames = 0;
6471
6472 if (chan->hs_hcon)
6473 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6474 else
6475 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6476
6477 err = l2cap_resegment(chan);
6478
6479 if (!err)
6480 err = l2cap_rx_state_recv(chan, control, skb, event);
6481
6482 return err;
6483}
6484
d2a7ac5d
MM		 6485static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6486{
6487 /* Make sure reqseq is for a packet that has been sent but not acked */
6488 u16 unacked;
6489
6490 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6491 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6492}
6493
cec8ab6e
MM		 6494static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6495 struct sk_buff *skb, u8 event)
218bb9df 6496{
d2a7ac5d
MM		 6497 int err = 0;
6498
6499 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6500 control, skb, event, chan->rx_state);
6501
6502 if (__valid_reqseq(chan, control->reqseq)) {
6503 switch (chan->rx_state) {
6504 case L2CAP_RX_STATE_RECV:
6505 err = l2cap_rx_state_recv(chan, control, skb, event);
6506 break;
6507 case L2CAP_RX_STATE_SREJ_SENT:
6508 err = l2cap_rx_state_srej_sent(chan, control, skb,
6509 event);
6510 break;
32b32735
MM		 6511 case L2CAP_RX_STATE_WAIT_P:
6512 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6513 break;
6514 case L2CAP_RX_STATE_WAIT_F:
6515 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6516 break;
d2a7ac5d
MM		 6517 default:
6518 /* shut it down */
6519 break;
6520 }
6521 } else {
6522 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6523 control->reqseq, chan->next_tx_seq,
6524 chan->expected_ack_seq);
5e4e3972 6525 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6526 }
6527
6528 return err;
cec8ab6e
MM		 6529}
6530
6531static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6532 struct sk_buff *skb)
6533{
4b51dae9
MM		 6534 int err = 0;
6535
6536 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6537 chan->rx_state);
6538
6539 if (l2cap_classify_txseq(chan, control->txseq) ==
6540 L2CAP_TXSEQ_EXPECTED) {
6541 l2cap_pass_to_tx(chan, control);
6542
6543 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6544 __next_seq(chan, chan->buffer_seq));
6545
6546 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6547
6548 l2cap_reassemble_sdu(chan, skb, control);
6549 } else {
6550 if (chan->sdu) {
6551 kfree_skb(chan->sdu);
6552 chan->sdu = NULL;
6553 }
6554 chan->sdu_last_frag = NULL;
6555 chan->sdu_len = 0;
6556
6557 if (skb) {
6558 BT_DBG("Freeing %p", skb);
6559 kfree_skb(skb);
6560 }
6561 }
6562
6563 chan->last_acked_seq = control->txseq;
6564 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6565
6566 return err;
cec8ab6e
MM		 6567}
6568
6569static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6570{
a4368ff3 6571 struct l2cap_ctrl *control = &bt_cb(skb)->l2cap;
cec8ab6e
MM		 6572 u16 len;
6573 u8 event;
218bb9df 6574
b76bbd66
MM		 6575 __unpack_control(chan, skb);
6576
218bb9df
GP		 6577 len = skb->len;
6578
6579 /*
6580 * We can just drop the corrupted I-frame here.
6581 * Receiver will miss it and start proper recovery
cec8ab6e 6582 * procedures and ask for retransmission.
218bb9df 6583 */
47d1ec61 6584 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6585 goto drop;
6586
cec8ab6e 6587 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6588 len -= L2CAP_SDULEN_SIZE;
218bb9df 6589
47d1ec61 6590 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6591 len -= L2CAP_FCS_SIZE;
218bb9df 6592
47d1ec61 6593 if (len > chan->mps) {
5e4e3972 6594 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6595 goto drop;
6596 }
6597
cec8ab6e
MM		 6598 if (!control->sframe) {
6599 int err;
218bb9df 6600
cec8ab6e
MM		 6601 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6602 control->sar, control->reqseq, control->final,
6603 control->txseq);
218bb9df 6604
cec8ab6e
MM		 6605 /* Validate F-bit - F=0 always valid, F=1 only
6606 * valid in TX WAIT_F
6607 */
6608 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6609 goto drop;
cec8ab6e
MM		 6610
6611 if (chan->mode != L2CAP_MODE_STREAMING) {
6612 event = L2CAP_EV_RECV_IFRAME;
6613 err = l2cap_rx(chan, control, skb, event);
6614 } else {
6615 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6616 }
6617
cec8ab6e 6618 if (err)
5e4e3972 6619 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6620 } else {
cec8ab6e
MM		 6621 const u8 rx_func_to_event[4] = {
6622 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6623 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6624 };
6625
6626 /* Only I-frames are expected in streaming mode */
6627 if (chan->mode == L2CAP_MODE_STREAMING)
6628 goto drop;
6629
6630 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6631 control->reqseq, control->final, control->poll,
6632 control->super);
6633
218bb9df 6634 if (len != 0) {
1bb166e6 6635 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6636 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6637 goto drop;
6638 }
6639
cec8ab6e
MM		 6640 /* Validate F and P bits */
6641 if (control->final && (control->poll ||
6642 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6643 goto drop;
6644
6645 event = rx_func_to_event[control->super];
6646 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6647 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6648 }
6649
6650 return 0;
6651
6652drop:
6653 kfree_skb(skb);
6654 return 0;
6655}
6656
b1c325c2
JH		 6657static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6658{
6659 struct l2cap_conn *conn = chan->conn;
6660 struct l2cap_le_credits pkt;
6661 u16 return_credits;
6662
6663 /* We return more credits to the sender only after the amount of
6664 * credits falls below half of the initial amount.
6665 */
f15b8ecf 6666 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6667 return;
6668
f15b8ecf 6669 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6670
6671 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6672
6673 chan->rx_credits += return_credits;
6674
6675 pkt.cid = cpu_to_le16(chan->scid);
6676 pkt.credits = cpu_to_le16(return_credits);
6677
6678 chan->ident = l2cap_get_ident(conn);
6679
6680 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6681}
6682
fad5fc89
JH		 6683static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6684{
aac23bf6
JH		 6685 int err;
6686
6687 if (!chan->rx_credits) {
6688 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6689 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6690 return -ENOBUFS;
aac23bf6 6691 }
fad5fc89 6692
aac23bf6
JH		 6693 if (chan->imtu < skb->len) {
6694 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6695 return -ENOBUFS;
aac23bf6 6696 }
fad5fc89
JH		 6697
6698 chan->rx_credits--;
6699 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6700
6701 l2cap_chan_le_send_credits(chan);
6702
aac23bf6
JH		 6703 err = 0;
6704
6705 if (!chan->sdu) {
6706 u16 sdu_len;
6707
6708 sdu_len = get_unaligned_le16(skb->data);
6709 skb_pull(skb, L2CAP_SDULEN_SIZE);
6710
6711 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6712 sdu_len, skb->len, chan->imtu);
6713
6714 if (sdu_len > chan->imtu) {
6715 BT_ERR("Too big LE L2CAP SDU length received");
6716 err = -EMSGSIZE;
6717 goto failed;
6718 }
6719
6720 if (skb->len > sdu_len) {
6721 BT_ERR("Too much LE L2CAP data received");
6722 err = -EINVAL;
6723 goto failed;
6724 }
6725
6726 if (skb->len == sdu_len)
6727 return chan->ops->recv(chan, skb);
6728
6729 chan->sdu = skb;
6730 chan->sdu_len = sdu_len;
6731 chan->sdu_last_frag = skb;
6732
6733 return 0;
6734 }
6735
6736 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6737 chan->sdu->len, skb->len, chan->sdu_len);
6738
6739 if (chan->sdu->len + skb->len > chan->sdu_len) {
6740 BT_ERR("Too much LE L2CAP data received");
6741 err = -EINVAL;
6742 goto failed;
6743 }
6744
6745 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6746 skb = NULL;
6747
6748 if (chan->sdu->len == chan->sdu_len) {
6749 err = chan->ops->recv(chan, chan->sdu);
6750 if (!err) {
6751 chan->sdu = NULL;
6752 chan->sdu_last_frag = NULL;
6753 chan->sdu_len = 0;
6754 }
6755 }
6756
6757failed:
6758 if (err) {
6759 kfree_skb(skb);
6760 kfree_skb(chan->sdu);
6761 chan->sdu = NULL;
6762 chan->sdu_last_frag = NULL;
6763 chan->sdu_len = 0;
6764 }
6765
6766 /* We can't return an error here since we took care of the skb
6767 * freeing internally. An error return would cause the caller to
6768 * do a double-free of the skb.
6769 */
6770 return 0;
fad5fc89
JH		 6771}
6772
13ca56e0
AE		 6773static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6774 struct sk_buff *skb)
1da177e4 6775{
48454079 6776 struct l2cap_chan *chan;
1da177e4 6777
baa7e1fa 6778 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6779 if (!chan) {
97e8e89d
AE		 6780 if (cid == L2CAP_CID_A2MP) {
6781 chan = a2mp_channel_create(conn, skb);
6782 if (!chan) {
6783 kfree_skb(skb);
13ca56e0 6784 return;
97e8e89d
AE		 6785 }
6786
6787 l2cap_chan_lock(chan);
6788 } else {
6789 BT_DBG("unknown cid 0x%4.4x", cid);
6790 /* Drop packet and return */
6791 kfree_skb(skb);
13ca56e0 6792 return;
97e8e89d 6793 }
1da177e4
LT		 6794 }
6795
49208c9c 6796 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6797
315917e0
JH		 6798 /* If we receive data on a fixed channel before the info req/rsp
6799 * procdure is done simply assume that the channel is supported
6800 * and mark it as ready.
6801 */
6802 if (chan->chan_type == L2CAP_CHAN_FIXED)
6803 l2cap_chan_ready(chan);
6804
89bc500e 6805 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6806 goto drop;
6807
0c1bc5c6 6808 switch (chan->mode) {
38319713 6809 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6810 if (l2cap_le_data_rcv(chan, skb) < 0)
6811 goto drop;
6812
6813 goto done;
6814
1c2acffb
GP		 6815 case L2CAP_MODE_BASIC:
6816 /* If socket recv buffers overflows we drop data here
6817 * which is *bad* because L2CAP has to be reliable.
6818 * But we don't have any other choice. L2CAP doesn't
6819 * provide flow control mechanism. */
1da177e4 6820
2c96e03d
SJ		 6821 if (chan->imtu < skb->len) {
6822 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6823 goto drop;
2c96e03d 6824 }
1da177e4 6825
80b98027 6826 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6827 goto done;
6828 break;
6829
6830 case L2CAP_MODE_ERTM:
6840ed07 6831 case L2CAP_MODE_STREAMING:
cec8ab6e 6832 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6833 goto done;
6834
1c2acffb 6835 default:
0c1bc5c6 6836 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6837 break;
6838 }
1da177e4
LT		 6839
6840drop:
6841 kfree_skb(skb);
6842
6843done:
6be36555 6844 l2cap_chan_unlock(chan);
1da177e4
LT		 6845}
6846
84104b24
AE		 6847static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6848 struct sk_buff *skb)
1da177e4 6849{
ae4fd2d3 6850 struct hci_conn *hcon = conn->hcon;
23691d75 6851 struct l2cap_chan *chan;
1da177e4 6852
ae4fd2d3 6853 if (hcon->type != ACL_LINK)
a24cce14 6854 goto free_skb;
ae4fd2d3 6855
bf20fd4e
JH		 6856 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6857 ACL_LINK);
23691d75 6858 if (!chan)
a24cce14 6859 goto free_skb;
1da177e4 6860
5b4cedaa 6861 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6862
89bc500e 6863 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6864 goto drop;
6865
e13e21dc 6866 if (chan->imtu < skb->len)
1da177e4
LT		 6867 goto drop;
6868
2edf870d 6869 /* Store remote BD_ADDR and PSM for msg_name */
a4368ff3
JH		 6870 bacpy(&bt_cb(skb)->l2cap.bdaddr, &hcon->dst);
6871 bt_cb(skb)->l2cap.psm = psm;
2edf870d 6872
a24cce14
JH		 6873 if (!chan->ops->recv(chan, skb)) {
6874 l2cap_chan_put(chan);
84104b24 6875 return;
a24cce14 6876 }
1da177e4
LT		 6877
6878drop:
a24cce14
JH		 6879 l2cap_chan_put(chan);
6880free_skb:
1da177e4 6881 kfree_skb(skb);
1da177e4
LT		 6882}
6883
6884static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6885{
6886 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6887 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6888 u16 cid, len;
6889 __le16 psm;
1da177e4 6890
61a939c6
JH		 6891 if (hcon->state != BT_CONNECTED) {
6892 BT_DBG("queueing pending rx skb");
6893 skb_queue_tail(&conn->pending_rx, skb);
6894 return;
6895 }
6896
1da177e4
LT		 6897 skb_pull(skb, L2CAP_HDR_SIZE);
6898 cid = __le16_to_cpu(lh->cid);
6899 len = __le16_to_cpu(lh->len);
6900
1c2acffb
GP		 6901 if (len != skb->len) {
6902 kfree_skb(skb);
6903 return;
6904 }
6905
9e1d7e15
JH		 6906 /* Since we can't actively block incoming LE connections we must
6907 * at least ensure that we ignore incoming data from them.
6908 */
6909 if (hcon->type == LE_LINK &&
dcc36c16 6910 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
a250e048 6911 bdaddr_dst_type(hcon))) {
e493150e
JH		 6912 kfree_skb(skb);
6913 return;
6914 }
6915
1da177e4
LT		 6916 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6917
6918 switch (cid) {
8db4dc46 6919 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6920 l2cap_sig_channel(conn, skb);
6921 break;
6922
8db4dc46 6923 case L2CAP_CID_CONN_LESS:
097db76c 6924 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6925 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6926 l2cap_conless_channel(conn, psm, skb);
6927 break;
6928
a2877629
MH		 6929 case L2CAP_CID_LE_SIGNALING:
6930 l2cap_le_sig_channel(conn, skb);
6931 break;
6932
1da177e4
LT		 6933 default:
6934 l2cap_data_channel(conn, cid, skb);
6935 break;
6936 }
6937}
6938
61a939c6
JH		 6939static void process_pending_rx(struct work_struct *work)
6940{
6941 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6942 pending_rx_work);
6943 struct sk_buff *skb;
6944
6945 BT_DBG("");
6946
6947 while ((skb = skb_dequeue(&conn->pending_rx)))
6948 l2cap_recv_frame(conn, skb);
6949}
6950
162b49e7
JH		 6951static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6952{
6953 struct l2cap_conn *conn = hcon->l2cap_data;
6954 struct hci_chan *hchan;
6955
6956 if (conn)
6957 return conn;
6958
6959 hchan = hci_chan_create(hcon);
6960 if (!hchan)
6961 return NULL;
6962
27f70f3e 6963 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
162b49e7
JH		 6964 if (!conn) {
6965 hci_chan_del(hchan);
6966 return NULL;
6967 }
6968
6969 kref_init(&conn->ref);
6970 hcon->l2cap_data = conn;
51bb8457 6971 conn->hcon = hci_conn_get(hcon);
162b49e7
JH		 6972 conn->hchan = hchan;
6973
6974 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6975
6976 switch (hcon->type) {
6977 case LE_LINK:
6978 if (hcon->hdev->le_mtu) {
6979 conn->mtu = hcon->hdev->le_mtu;
6980 break;
6981 }
6982 /* fall through */
6983 default:
6984 conn->mtu = hcon->hdev->acl_mtu;
6985 break;
6986 }
6987
6988 conn->feat_mask = 0;
6989
0bd49fc7
JH		 6990 conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS;
6991
6992 if (hcon->type == ACL_LINK &&
d7a5a11d 6993 hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED))
0bd49fc7 6994 conn->local_fixed_chan |= L2CAP_FC_A2MP;
162b49e7 6995
d7a5a11d 6996 if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) &&
f9be9e86 6997 (bredr_sc_enabled(hcon->hdev) ||
b7cb93e5 6998 hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP)))
b5ae344d
JH		 6999 conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR;
7000
5a54e7c8 7001 mutex_init(&conn->ident_lock);
162b49e7
JH		 7002 mutex_init(&conn->chan_lock);
7003
7004 INIT_LIST_HEAD(&conn->chan_l);
7005 INIT_LIST_HEAD(&conn->users);
7006
276d8073 7007 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
162b49e7 7008
61a939c6
JH		 7009 skb_queue_head_init(&conn->pending_rx);
7010 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
f3d82d0c 7011 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
61a939c6 7012
162b49e7
JH		 7013 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
7014
7015 return conn;
7016}
7017
7018static bool is_valid_psm(u16 psm, u8 dst_type) {
7019 if (!psm)
7020 return false;
7021
7022 if (bdaddr_type_is_le(dst_type))
7023 return (psm <= 0x00ff);
7024
7025 /* PSM must be odd and lsb of upper byte must be 0 */
7026 return ((psm & 0x0101) == 0x0001);
7027}
7028
7029int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
7030 bdaddr_t *dst, u8 dst_type)
7031{
7032 struct l2cap_conn *conn;
7033 struct hci_conn *hcon;
7034 struct hci_dev *hdev;
162b49e7
JH		 7035 int err;
7036
7037 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7038 dst_type, __le16_to_cpu(psm));
7039
7040 hdev = hci_get_route(dst, &chan->src);
7041 if (!hdev)
7042 return -EHOSTUNREACH;
7043
7044 hci_dev_lock(hdev);
7045
162b49e7
JH		 7046 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7047 chan->chan_type != L2CAP_CHAN_RAW) {
7048 err = -EINVAL;
7049 goto done;
7050 }
7051
21626e62
JH		 7052 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7053 err = -EINVAL;
7054 goto done;
7055 }
7056
7057 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 7058 err = -EINVAL;
7059 goto done;
7060 }
7061
7062 switch (chan->mode) {
7063 case L2CAP_MODE_BASIC:
7064 break;
7065 case L2CAP_MODE_LE_FLOWCTL:
7066 l2cap_le_flowctl_init(chan);
7067 break;
7068 case L2CAP_MODE_ERTM:
7069 case L2CAP_MODE_STREAMING:
7070 if (!disable_ertm)
7071 break;
7072 /* fall through */
7073 default:
beb19e4c 7074 err = -EOPNOTSUPP;
162b49e7
JH		 7075 goto done;
7076 }
7077
7078 switch (chan->state) {
7079 case BT_CONNECT:
7080 case BT_CONNECT2:
7081 case BT_CONFIG:
7082 /* Already connecting */
7083 err = 0;
7084 goto done;
7085
7086 case BT_CONNECTED:
7087 /* Already connected */
7088 err = -EISCONN;
7089 goto done;
7090
7091 case BT_OPEN:
7092 case BT_BOUND:
7093 /* Can connect */
7094 break;
7095
7096 default:
7097 err = -EBADFD;
7098 goto done;
7099 }
7100
7101 /* Set destination address and psm */
7102 bacpy(&chan->dst, dst);
7103 chan->dst_type = dst_type;
7104
7105 chan->psm = psm;
7106 chan->dcid = cid;
7107
6f77d8c7 7108 if (bdaddr_type_is_le(dst_type)) {
e804d25d 7109 u8 role;
cdd6275e 7110
6f77d8c7
AG		 7111 /* Convert from L2CAP channel address type to HCI address type
7112 */
7113 if (dst_type == BDADDR_LE_PUBLIC)
7114 dst_type = ADDR_LE_DEV_PUBLIC;
7115 else
7116 dst_type = ADDR_LE_DEV_RANDOM;
7117
d7a5a11d 7118 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
e804d25d
JH		 7119 role = HCI_ROLE_SLAVE;
7120 else
7121 role = HCI_ROLE_MASTER;
cdd6275e 7122
fa142220
JP		 7123 hcon = hci_connect_le_scan(hdev, dst, dst_type,
7124 chan->sec_level,
7125 HCI_LE_CONN_TIMEOUT,
7126 role);
6f77d8c7 7127 } else {
d93375a8 7128 u8 auth_type = l2cap_get_auth_type(chan);
04a6c589 7129 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7130 }
162b49e7
JH		 7131
7132 if (IS_ERR(hcon)) {
7133 err = PTR_ERR(hcon);
7134 goto done;
7135 }
7136
7137 conn = l2cap_conn_add(hcon);
7138 if (!conn) {
7139 hci_conn_drop(hcon);
7140 err = -ENOMEM;
7141 goto done;
7142 }
7143
02e246ae
JH		 7144 mutex_lock(&conn->chan_lock);
7145 l2cap_chan_lock(chan);
7146
162b49e7
JH		 7147 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7148 hci_conn_drop(hcon);
7149 err = -EBUSY;
02e246ae 7150 goto chan_unlock;
162b49e7
JH		 7151 }
7152
7153 /* Update source addr of the socket */
7154 bacpy(&chan->src, &hcon->src);
a250e048 7155 chan->src_type = bdaddr_src_type(hcon);
162b49e7 7156
02e246ae 7157 __l2cap_chan_add(conn, chan);
162b49e7
JH		 7158
7159 /* l2cap_chan_add takes its own ref so we can drop this one */
7160 hci_conn_drop(hcon);
7161
7162 l2cap_state_change(chan, BT_CONNECT);
7163 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7164
61202e4d
JH		 7165 /* Release chan->sport so that it can be reused by other
7166 * sockets (as it's only used for listening sockets).
7167 */
7168 write_lock(&chan_list_lock);
7169 chan->sport = 0;
7170 write_unlock(&chan_list_lock);
7171
162b49e7
JH		 7172 if (hcon->state == BT_CONNECTED) {
7173 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7174 __clear_chan_timer(chan);
e7cafc45 7175 if (l2cap_chan_check_security(chan, true))
162b49e7
JH		 7176 l2cap_state_change(chan, BT_CONNECTED);
7177 } else
7178 l2cap_do_start(chan);
7179 }
7180
7181 err = 0;
7182
02e246ae 7183chan_unlock:
162b49e7 7184 l2cap_chan_unlock(chan);
02e246ae
JH		 7185 mutex_unlock(&conn->chan_lock);
7186done:
162b49e7
JH		 7187 hci_dev_unlock(hdev);
7188 hci_dev_put(hdev);
7189 return err;
7190}
6b8d4a6a 7191EXPORT_SYMBOL_GPL(l2cap_chan_connect);
162b49e7 7192
1da177e4
LT		 7193/* ---- L2CAP interface with lower layer (HCI) ---- */
7194
686ebf28 7195int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7196{
7197 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7198 struct l2cap_chan *c;
1da177e4 7199
6ed93dc6 7200 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7201
7202 /* Find listening sockets and check their link_mode */
23691d75
GP		 7203 read_lock(&chan_list_lock);
7204 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7205 if (c->state != BT_LISTEN)
1da177e4
LT		 7206 continue;
7207
7eafc59e 7208 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7209 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7210 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7211 lm1 |= HCI_LM_MASTER;
1da177e4 7212 exact++;
7eafc59e 7213 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7214 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7215 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7216 lm2 |= HCI_LM_MASTER;
7217 }
1da177e4 7218 }
23691d75 7219 read_unlock(&chan_list_lock);
1da177e4
LT		 7220
7221 return exact ? lm1 : lm2;
7222}
7223
e760ec12
JH		 7224/* Find the next fixed channel in BT_LISTEN state, continue iteration
7225 * from an existing channel in the list or from the beginning of the
7226 * global list (by passing NULL as first parameter).
7227 */
7228static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
327a7191 7229 struct hci_conn *hcon)
e760ec12 7230{
327a7191
JH		 7231 u8 src_type = bdaddr_src_type(hcon);
7232
e760ec12
JH		 7233 read_lock(&chan_list_lock);
7234
7235 if (c)
7236 c = list_next_entry(c, global_l);
7237 else
7238 c = list_entry(chan_list.next, typeof(*c), global_l);
7239
7240 list_for_each_entry_from(c, &chan_list, global_l) {
7241 if (c->chan_type != L2CAP_CHAN_FIXED)
7242 continue;
7243 if (c->state != BT_LISTEN)
7244 continue;
327a7191 7245 if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY))
54a1b626 7246 continue;
327a7191 7247 if (src_type != c->src_type)
54a1b626 7248 continue;
e760ec12
JH		 7249
7250 l2cap_chan_hold(c);
7251 read_unlock(&chan_list_lock);
7252 return c;
7253 }
7254
7255 read_unlock(&chan_list_lock);
7256
7257 return NULL;
7258}
7259
539c496d 7260static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7261{
e760ec12 7262 struct hci_dev *hdev = hcon->hdev;
0139418c 7263 struct l2cap_conn *conn;
e760ec12
JH		 7264 struct l2cap_chan *pchan;
7265 u8 dst_type;
0139418c 7266
539c496d
JH		 7267 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7268 return;
7269
6ed93dc6 7270 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7271
dc0f5088 7272 if (status) {
e175072f 7273 l2cap_conn_del(hcon, bt_to_errno(status));
dc0f5088 7274 return;
ba6fc317 7275 }
dc0f5088
JH		 7276
7277 conn = l2cap_conn_add(hcon);
7278 if (!conn)
7279 return;
7280
a250e048 7281 dst_type = bdaddr_dst_type(hcon);
e760ec12
JH		 7282
7283 /* If device is blocked, do not create channels for it */
7284 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7285 return;
7286
7287 /* Find fixed channels and notify them of the new connection. We
7288 * use multiple individual lookups, continuing each time where
7289 * we left off, because the list lock would prevent calling the
7290 * potentially sleeping l2cap_chan_lock() function.
7291 */
327a7191 7292 pchan = l2cap_global_fixed_chan(NULL, hcon);
e760ec12
JH		 7293 while (pchan) {
7294 struct l2cap_chan *chan, *next;
7295
7296 /* Client fixed channels should override server ones */
7297 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7298 goto next;
7299
7300 l2cap_chan_lock(pchan);
7301 chan = pchan->ops->new_connection(pchan);
7302 if (chan) {
7303 bacpy(&chan->src, &hcon->src);
7304 bacpy(&chan->dst, &hcon->dst);
a250e048 7305 chan->src_type = bdaddr_src_type(hcon);
e760ec12
JH		 7306 chan->dst_type = dst_type;
7307
7308 __l2cap_chan_add(conn, chan);
7309 }
7310
7311 l2cap_chan_unlock(pchan);
7312next:
327a7191 7313 next = l2cap_global_fixed_chan(pchan, hcon);
e760ec12
JH		 7314 l2cap_chan_put(pchan);
7315 pchan = next;
7316 }
7317
dc0f5088 7318 l2cap_conn_ready(conn);
1da177e4
LT		 7319}
7320
686ebf28 7321int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7322{
7323 struct l2cap_conn *conn = hcon->l2cap_data;
7324
7325 BT_DBG("hcon %p", hcon);
7326
686ebf28 7327 if (!conn)
9f5a0d7b 7328 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7329 return conn->disc_reason;
7330}
7331
3a6d576b 7332static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4 7333{
3a6d576b
JH		 7334 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7335 return;
7336
1da177e4
LT		 7337 BT_DBG("hcon %p reason %d", hcon, reason);
7338
e175072f 7339 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7340}
7341
4343478f 7342static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7343{
715ec005 7344 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7345 return;
7346
f62e4323 7347 if (encrypt == 0x00) {
4343478f 7348 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7349 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7350 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7351 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7352 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7353 } else {
4343478f 7354 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7355 __clear_chan_timer(chan);
f62e4323
MH		 7356 }
7357}
7358
354fe804 7359static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7360{
0139418c 7361 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7362 struct l2cap_chan *chan;
1da177e4 7363
0139418c 7364 if (!conn)
354fe804 7365 return;
0139418c 7366
89d8b407 7367 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7368
3df91ea2 7369 mutex_lock(&conn->chan_lock);
1da177e4 7370
3df91ea2 7371 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7372 l2cap_chan_lock(chan);
1da177e4 7373
89d8b407
AE		 7374 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7375 state_to_string(chan->state));
f1cb9af5 7376
2338a7e0 7377 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7378 l2cap_chan_unlock(chan);
7379 continue;
7380 }
7381
191eb398
JH		 7382 if (!status && encrypt)
7383 chan->sec_level = hcon->sec_level;
f1cb9af5 7384
96eff46e 7385 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7386 l2cap_chan_unlock(chan);
6a8d3010
MH		 7387 continue;
7388 }
7389
89bc500e 7390 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7391 chan->state == BT_CONFIG)) {
d97c899b 7392 chan->ops->resume(chan);
4343478f 7393 l2cap_check_encryption(chan, encrypt);
6be36555 7394 l2cap_chan_unlock(chan);
9719f8af
MH		 7395 continue;
7396 }
7397
89bc500e 7398 if (chan->state == BT_CONNECT) {
6d3c15da 7399 if (!status)
93c3e8f5 7400 l2cap_start_connection(chan);
6d3c15da 7401 else
ba13ccd9 7402 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
fa37c1aa
JH		 7403 } else if (chan->state == BT_CONNECT2 &&
7404 chan->mode != L2CAP_MODE_LE_FLOWCTL) {
b1235d79 7405 struct l2cap_conn_rsp rsp;
df3c3931 7406 __u16 res, stat;
1da177e4 7407
b1235d79 7408 if (!status) {
bdc25783 7409 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7410 res = L2CAP_CR_PEND;
7411 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7412 chan->ops->defer(chan);
df3c3931 7413 } else {
acdcabf5 7414 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7415 res = L2CAP_CR_SUCCESS;
7416 stat = L2CAP_CS_NO_INFO;
7417 }
b1235d79 7418 } else {
acdcabf5 7419 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7420 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7421 res = L2CAP_CR_SEC_BLOCK;
7422 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7423 }
7424
fe4128e0
GP		 7425 rsp.scid = cpu_to_le16(chan->dcid);
7426 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7427 rsp.result = cpu_to_le16(res);
7428 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7429 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7430 sizeof(rsp), &rsp);
2d369359
MM		 7431
7432 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7433 res == L2CAP_CR_SUCCESS) {
7434 char buf[128];
7435 set_bit(CONF_REQ_SENT, &chan->conf_state);
7436 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7437 L2CAP_CONF_REQ,
7438 l2cap_build_conf_req(chan, buf),
7439 buf);
7440 chan->num_conf_req++;
7441 }
b1235d79 7442 }
1da177e4 7443
6be36555 7444 l2cap_chan_unlock(chan);
1da177e4
LT		 7445 }
7446
3df91ea2 7447 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 7448}
7449
9b4c3336 7450void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7451{
7452 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7453 struct l2cap_hdr *hdr;
7454 int len;
1da177e4 7455
1d13a254
AE		 7456 /* For AMP controller do not create l2cap conn */
7457 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7458 goto drop;
1da177e4 7459
5a08ecce 7460 if (!conn)
baf43251 7461 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7462
7463 if (!conn)
1da177e4
LT		 7464 goto drop;
7465
7466 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7467
d73a0988
AE		 7468 switch (flags) {
7469 case ACL_START:
7470 case ACL_START_NO_FLUSH:
7471 case ACL_COMPLETE:
1da177e4
LT		 7472 if (conn->rx_len) {
7473 BT_ERR("Unexpected start frame (len %d)", skb->len);
7474 kfree_skb(conn->rx_skb);
7475 conn->rx_skb = NULL;
7476 conn->rx_len = 0;
7477 l2cap_conn_unreliable(conn, ECOMM);
7478 }
7479
aae7fe22
AE		 7480 /* Start fragment always begin with Basic L2CAP header */
7481 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7482 BT_ERR("Frame is too short (len %d)", skb->len);
7483 l2cap_conn_unreliable(conn, ECOMM);
7484 goto drop;
7485 }
7486
7487 hdr = (struct l2cap_hdr *) skb->data;
7488 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7489
7490 if (len == skb->len) {
7491 /* Complete frame received */
7492 l2cap_recv_frame(conn, skb);
9b4c3336 7493 return;
1da177e4
LT		 7494 }
7495
7496 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7497
7498 if (skb->len > len) {
7499 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7500 skb->len, len);
1da177e4
LT		 7501 l2cap_conn_unreliable(conn, ECOMM);
7502 goto drop;
7503 }
7504
7505 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7506 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7507 if (!conn->rx_skb)
1da177e4
LT		 7508 goto drop;
7509
d626f62b 7510 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7511 skb->len);
1da177e4 7512 conn->rx_len = len - skb->len;
d73a0988
AE		 7513 break;
7514
7515 case ACL_CONT:
1da177e4
LT		 7516 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7517
7518 if (!conn->rx_len) {
7519 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7520 l2cap_conn_unreliable(conn, ECOMM);
7521 goto drop;
7522 }
7523
7524 if (skb->len > conn->rx_len) {
7525 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7526 skb->len, conn->rx_len);
1da177e4
LT		 7527 kfree_skb(conn->rx_skb);
7528 conn->rx_skb = NULL;
7529 conn->rx_len = 0;
7530 l2cap_conn_unreliable(conn, ECOMM);
7531 goto drop;
7532 }
7533
d626f62b 7534 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7535 skb->len);
1da177e4
LT		 7536 conn->rx_len -= skb->len;
7537
7538 if (!conn->rx_len) {
c4e5bafa
JH		 7539 /* Complete frame received. l2cap_recv_frame
7540 * takes ownership of the skb so set the global
7541 * rx_skb pointer to NULL first.
7542 */
7543 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7544 conn->rx_skb = NULL;
c4e5bafa 7545 l2cap_recv_frame(conn, rx_skb);
1da177e4 7546 }
d73a0988 7547 break;
1da177e4
LT		 7548 }
7549
7550drop:
7551 kfree_skb(skb);
1da177e4
LT		 7552}
7553
354fe804
JH		 7554static struct hci_cb l2cap_cb = {
7555 .name = "L2CAP",
539c496d 7556 .connect_cfm = l2cap_connect_cfm,
3a6d576b 7557 .disconn_cfm = l2cap_disconn_cfm,
354fe804
JH		 7558 .security_cfm = l2cap_security_cfm,
7559};
7560
aef7d97c 7561static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7562{
23691d75 7563 struct l2cap_chan *c;
1da177e4 7564
333055f2 7565 read_lock(&chan_list_lock);
1da177e4 7566
23691d75 7567 list_for_each_entry(c, &chan_list, global_l) {
eeb5a067
MH		 7568 seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7569 &c->src, c->src_type, &c->dst, c->dst_type,
fcb73338
AE		 7570 c->state, __le16_to_cpu(c->psm),
7571 c->scid, c->dcid, c->imtu, c->omtu,
7572 c->sec_level, c->mode);
61e1b4b7 7573 }
1da177e4 7574
333055f2 7575 read_unlock(&chan_list_lock);
1da177e4 7576
aef7d97c 7577 return 0;
1da177e4
LT		 7578}
7579
aef7d97c
MH		 7580static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7581{
7582 return single_open(file, l2cap_debugfs_show, inode->i_private);
7583}
7584
7585static const struct file_operations l2cap_debugfs_fops = {
7586 .open = l2cap_debugfs_open,
7587 .read = seq_read,
7588 .llseek = seq_lseek,
7589 .release = single_release,
7590};
7591
7592static struct dentry *l2cap_debugfs;
1da177e4 7593
64274518 7594int __init l2cap_init(void)
1da177e4
LT		 7595{
7596 int err;
be9d1227 7597
bb58f747 7598 err = l2cap_init_sockets();
1da177e4
LT		 7599 if (err < 0)
7600 return err;
7601
354fe804
JH		 7602 hci_register_cb(&l2cap_cb);
7603
1120e4bf
MH		 7604 if (IS_ERR_OR_NULL(bt_debugfs))
7605 return 0;
7606
7607 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7608 NULL, &l2cap_debugfs_fops);
1da177e4 7609
40b9397a 7610 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
f15b8ecf 7611 &le_max_credits);
40b9397a 7612 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
f15b8ecf
JH		 7613 &le_default_mps);
7614
1da177e4 7615 return 0;
1da177e4
LT		 7616}
7617
64274518 7618void l2cap_exit(void)
1da177e4 7619{
aef7d97c 7620 debugfs_remove(l2cap_debugfs);
354fe804 7621 hci_unregister_cb(&l2cap_cb);
bb58f747 7622 l2cap_cleanup_sockets();
1da177e4
LT		 7623}
7624
d1c4a17d
GP		 7625module_param(disable_ertm, bool, 0644);
7626MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
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