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Bluetooth: hidp: replace kzalloc/copy_from_user by memdup_user
[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;
a6801ca9 49static u8 l2cap_fixed_chan[8] = { L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS, };
1da177e4 50
b5ad8b7f
JB		 51static LIST_HEAD(chan_list);
52static DEFINE_RWLOCK(chan_list_lock);
1da177e4 53
f15b8ecf
JH		 54static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
55static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
56
1da177e4 57static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 58 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 59static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 60 void *data);
710f9b0a 61static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 62static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 63
d660366d 64static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 65 struct sk_buff_head *skbs, u8 event);
608bcc6d 66
4f1654e0
MH		 67static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
68{
69 if (hcon->type == LE_LINK) {
70 if (type == ADDR_LE_DEV_PUBLIC)
71 return BDADDR_LE_PUBLIC;
72 else
73 return BDADDR_LE_RANDOM;
74 }
75
76 return BDADDR_BREDR;
77}
78
0139418c 79/* ---- L2CAP channels ---- */
71ba0e56 80
2d792818
GP		 81static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
82 u16 cid)
0139418c 83{
3df91ea2 84 struct l2cap_chan *c;
3d57dc68 85
3df91ea2
AE		 86 list_for_each_entry(c, &conn->chan_l, list) {
87 if (c->dcid == cid)
88 return c;
0139418c 89 }
3df91ea2 90 return NULL;
0139418c
MH		 91}
92
2d792818
GP		 93static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
94 u16 cid)
0139418c 95{
3df91ea2 96 struct l2cap_chan *c;
3d57dc68 97
3df91ea2
AE		 98 list_for_each_entry(c, &conn->chan_l, list) {
99 if (c->scid == cid)
100 return c;
0139418c 101 }
3df91ea2 102 return NULL;
0139418c
MH		 103}
104
105/* Find channel with given SCID.
ef191ade 106 * Returns locked channel. */
2d792818
GP		 107static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
108 u16 cid)
0139418c 109{
48454079 110 struct l2cap_chan *c;
baa7e1fa 111
3df91ea2 112 mutex_lock(&conn->chan_lock);
baa7e1fa 113 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 114 if (c)
115 l2cap_chan_lock(c);
3df91ea2
AE		 116 mutex_unlock(&conn->chan_lock);
117
48454079 118 return c;
0139418c
MH		 119}
120
b1a130b7
MM		 121/* Find channel with given DCID.
122 * Returns locked channel.
123 */
124static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
125 u16 cid)
126{
127 struct l2cap_chan *c;
128
129 mutex_lock(&conn->chan_lock);
130 c = __l2cap_get_chan_by_dcid(conn, cid);
131 if (c)
132 l2cap_chan_lock(c);
133 mutex_unlock(&conn->chan_lock);
134
135 return c;
136}
137
2d792818
GP		 138static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
139 u8 ident)
0139418c 140{
3df91ea2 141 struct l2cap_chan *c;
3d57dc68 142
3df91ea2
AE		 143 list_for_each_entry(c, &conn->chan_l, list) {
144 if (c->ident == ident)
145 return c;
0139418c 146 }
3df91ea2 147 return NULL;
0139418c
MH		 148}
149
5b155ef9
MM		 150static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
151 u8 ident)
152{
153 struct l2cap_chan *c;
154
155 mutex_lock(&conn->chan_lock);
156 c = __l2cap_get_chan_by_ident(conn, ident);
157 if (c)
158 l2cap_chan_lock(c);
159 mutex_unlock(&conn->chan_lock);
160
161 return c;
162}
163
23691d75 164static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 165{
23691d75 166 struct l2cap_chan *c;
9e4425ff 167
23691d75 168 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 169 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 170 return c;
9e4425ff 171 }
250938cb 172 return NULL;
9e4425ff
GP		 173}
174
175int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
176{
73b2ec18
GP		 177 int err;
178
333055f2 179 write_lock(&chan_list_lock);
9e4425ff 180
23691d75 181 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 182 err = -EADDRINUSE;
183 goto done;
9e4425ff
GP		 184 }
185
73b2ec18
GP		 186 if (psm) {
187 chan->psm = psm;
188 chan->sport = psm;
189 err = 0;
190 } else {
191 u16 p;
192
193 err = -EINVAL;
194 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 195 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 196 chan->psm = cpu_to_le16(p);
197 chan->sport = cpu_to_le16(p);
198 err = 0;
199 break;
200 }
201 }
9e4425ff 202
73b2ec18 203done:
333055f2 204 write_unlock(&chan_list_lock);
73b2ec18 205 return err;
9e4425ff 206}
6b8d4a6a 207EXPORT_SYMBOL_GPL(l2cap_add_psm);
9e4425ff
GP		 208
209int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
210{
333055f2 211 write_lock(&chan_list_lock);
9e4425ff 212
14824308
JH		 213 /* Override the defaults (which are for conn-oriented) */
214 chan->omtu = L2CAP_DEFAULT_MTU;
215 chan->chan_type = L2CAP_CHAN_FIXED;
216
9e4425ff
GP		 217 chan->scid = scid;
218
333055f2 219 write_unlock(&chan_list_lock);
9e4425ff
GP		 220
221 return 0;
222}
223
baa7e1fa 224static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 225{
e77af755 226 u16 cid, dyn_end;
0139418c 227
e77af755
JH		 228 if (conn->hcon->type == LE_LINK)
229 dyn_end = L2CAP_CID_LE_DYN_END;
230 else
231 dyn_end = L2CAP_CID_DYN_END;
232
233 for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) {
baa7e1fa 234 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 235 return cid;
236 }
237
238 return 0;
239}
240
f93fa273 241static void l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 242{
42d2d87c 243 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 244 state_to_string(state));
badaaa00 245
89bc500e 246 chan->state = state;
53f52121 247 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 248}
249
f8e73017
GP		 250static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
251 int state, int err)
2e0052e4 252{
f8e73017 253 chan->state = state;
53f52121 254 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 255}
256
257static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
258{
f8e73017 259 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 260}
261
4239d16f
MM		 262static void __set_retrans_timer(struct l2cap_chan *chan)
263{
264 if (!delayed_work_pending(&chan->monitor_timer) &&
265 chan->retrans_timeout) {
266 l2cap_set_timer(chan, &chan->retrans_timer,
267 msecs_to_jiffies(chan->retrans_timeout));
268 }
269}
270
271static void __set_monitor_timer(struct l2cap_chan *chan)
272{
273 __clear_retrans_timer(chan);
274 if (chan->monitor_timeout) {
275 l2cap_set_timer(chan, &chan->monitor_timer,
276 msecs_to_jiffies(chan->monitor_timeout));
277 }
278}
279
608bcc6d
MM		 280static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
281 u16 seq)
282{
283 struct sk_buff *skb;
284
285 skb_queue_walk(head, skb) {
286 if (bt_cb(skb)->control.txseq == seq)
287 return skb;
288 }
289
290 return NULL;
291}
292
3c588192
MM		 293/* ---- L2CAP sequence number lists ---- */
294
295/* For ERTM, ordered lists of sequence numbers must be tracked for
296 * SREJ requests that are received and for frames that are to be
297 * retransmitted. These seq_list functions implement a singly-linked
298 * list in an array, where membership in the list can also be checked
299 * in constant time. Items can also be added to the tail of the list
300 * and removed from the head in constant time, without further memory
301 * allocs or frees.
302 */
303
304static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
305{
306 size_t alloc_size, i;
307
308 /* Allocated size is a power of 2 to map sequence numbers
309 * (which may be up to 14 bits) in to a smaller array that is
310 * sized for the negotiated ERTM transmit windows.
311 */
312 alloc_size = roundup_pow_of_two(size);
313
314 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
315 if (!seq_list->list)
316 return -ENOMEM;
317
318 seq_list->mask = alloc_size - 1;
319 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
320 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
321 for (i = 0; i < alloc_size; i++)
322 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
323
324 return 0;
325}
326
327static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
328{
329 kfree(seq_list->list);
330}
331
332static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
333 u16 seq)
334{
335 /* Constant-time check for list membership */
336 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
337}
338
03a0c5d6 339static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
3c588192 340{
03a0c5d6 341 u16 seq = seq_list->head;
3c588192
MM		 342 u16 mask = seq_list->mask;
343
03a0c5d6
JH		 344 seq_list->head = seq_list->list[seq & mask];
345 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
346
347 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
348 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
349 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192 350 }
3c588192 351
03a0c5d6 352 return seq;
3c588192
MM		 353}
354
355static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
356{
f522ae36 357 u16 i;
3c588192 358
f522ae36
GP		 359 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
360 return;
361
362 for (i = 0; i <= seq_list->mask; i++)
363 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
364
365 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
366 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 367}
368
369static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
370{
371 u16 mask = seq_list->mask;
372
373 /* All appends happen in constant time */
374
f522ae36
GP		 375 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
376 return;
3c588192 377
f522ae36
GP		 378 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
379 seq_list->head = seq;
380 else
381 seq_list->list[seq_list->tail & mask] = seq;
382
383 seq_list->tail = seq;
384 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 385}
386
721c4181 387static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 388{
721c4181 389 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 390 chan_timer.work);
3df91ea2 391 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 392 int reason;
393
e05dcc32 394 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 395
3df91ea2 396 mutex_lock(&conn->chan_lock);
6be36555 397 l2cap_chan_lock(chan);
ab07801d 398
89bc500e 399 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 400 reason = ECONNREFUSED;
89bc500e 401 else if (chan->state == BT_CONNECT &&
2d792818 402 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 403 reason = ECONNREFUSED;
404 else
405 reason = ETIMEDOUT;
406
0f852724 407 l2cap_chan_close(chan, reason);
ab07801d 408
6be36555 409 l2cap_chan_unlock(chan);
ab07801d 410
80b98027 411 chan->ops->close(chan);
3df91ea2
AE		 412 mutex_unlock(&conn->chan_lock);
413
371fd835 414 l2cap_chan_put(chan);
ab07801d
GP		 415}
416
eef1d9b6 417struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 418{
419 struct l2cap_chan *chan;
420
421 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
422 if (!chan)
423 return NULL;
424
c03b355e
AE		 425 mutex_init(&chan->lock);
426
ff714119
JH		 427 /* Set default lock nesting level */
428 atomic_set(&chan->nesting, L2CAP_NESTING_NORMAL);
429
333055f2 430 write_lock(&chan_list_lock);
23691d75 431 list_add(&chan->global_l, &chan_list);
333055f2 432 write_unlock(&chan_list_lock);
23691d75 433
721c4181 434 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 435
89bc500e
GP		 436 chan->state = BT_OPEN;
437
144ad330 438 kref_init(&chan->kref);
71ba0e56 439
2827011f
MM		 440 /* This flag is cleared in l2cap_chan_ready() */
441 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
442
eef1d9b6 443 BT_DBG("chan %p", chan);
abc545b8 444
48454079
GP		 445 return chan;
446}
6b8d4a6a 447EXPORT_SYMBOL_GPL(l2cap_chan_create);
48454079 448
144ad330 449static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 450{
144ad330
SS		 451 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
452
4af66c69
JK		 453 BT_DBG("chan %p", chan);
454
333055f2 455 write_lock(&chan_list_lock);
23691d75 456 list_del(&chan->global_l);
333055f2 457 write_unlock(&chan_list_lock);
23691d75 458
4af66c69 459 kfree(chan);
6ff5abbf
GP		 460}
461
30648372
JK		 462void l2cap_chan_hold(struct l2cap_chan *c)
463{
144ad330 464 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 465
144ad330 466 kref_get(&c->kref);
30648372
JK		 467}
468
469void l2cap_chan_put(struct l2cap_chan *c)
470{
144ad330 471 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 472
144ad330 473 kref_put(&c->kref, l2cap_chan_destroy);
30648372 474}
6b8d4a6a 475EXPORT_SYMBOL_GPL(l2cap_chan_put);
30648372 476
bd4b1653
AE		 477void l2cap_chan_set_defaults(struct l2cap_chan *chan)
478{
479 chan->fcs = L2CAP_FCS_CRC16;
480 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
481 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
482 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
6a5e8165
JR		 483 chan->remote_max_tx = chan->max_tx;
484 chan->remote_tx_win = chan->tx_win;
c20f8e35 485 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653 486 chan->sec_level = BT_SECURITY_LOW;
6a5e8165
JR		 487 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
488 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
489 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
490 chan->conf_state = 0;
bd4b1653
AE		 491
492 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
493}
6b8d4a6a 494EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
bd4b1653 495
0ce43ce6 496static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 497{
0ce43ce6
JH		 498 chan->sdu = NULL;
499 chan->sdu_last_frag = NULL;
500 chan->sdu_len = 0;
0cd75f7e 501 chan->tx_credits = 0;
f15b8ecf 502 chan->rx_credits = le_max_credits;
d1d79413 503 chan->mps = min_t(u16, chan->imtu, le_default_mps);
0ce43ce6
JH		 504
505 skb_queue_head_init(&chan->tx_q);
38319713
JH		 506}
507
93c3e8f5 508void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 509{
af05b30b 510 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 511 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 512
9f5a0d7b 513 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 514
8c1d787b 515 chan->conn = conn;
0139418c 516
5491120e
AE		 517 switch (chan->chan_type) {
518 case L2CAP_CHAN_CONN_ORIENTED:
21626e62
JH		 519 /* Alloc CID for connection-oriented socket */
520 chan->scid = l2cap_alloc_cid(conn);
521 if (conn->hcon->type == ACL_LINK)
0c1bc5c6 522 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 523 break;
524
525 case L2CAP_CHAN_CONN_LESS:
0139418c 526 /* Connectionless socket */
fe4128e0
GP		 527 chan->scid = L2CAP_CID_CONN_LESS;
528 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 529 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 530 break;
531
2338a7e0
JH		 532 case L2CAP_CHAN_FIXED:
533 /* Caller will set CID and CID specific MTU values */
416fa752
AE		 534 break;
535
5491120e 536 default:
0139418c 537 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 538 chan->scid = L2CAP_CID_SIGNALING;
539 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 540 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 541 }
542
8f7975b1
AE		 543 chan->local_id = L2CAP_BESTEFFORT_ID;
544 chan->local_stype = L2CAP_SERV_BESTEFFORT;
545 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
546 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
547 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 548 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 549
371fd835 550 l2cap_chan_hold(chan);
baa7e1fa 551
c16900cf
JH		 552 /* Only keep a reference for fixed channels if they requested it */
553 if (chan->chan_type != L2CAP_CHAN_FIXED ||
554 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
555 hci_conn_hold(conn->hcon);
5ee9891d 556
3df91ea2 557 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 558}
559
466f8004 560void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 561{
562 mutex_lock(&conn->chan_lock);
563 __l2cap_chan_add(conn, chan);
3df91ea2 564 mutex_unlock(&conn->chan_lock);
0139418c
MH		 565}
566
466f8004 567void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 568{
8c1d787b 569 struct l2cap_conn *conn = chan->conn;
0139418c 570
c9b66675 571 __clear_chan_timer(chan);
0139418c 572
49208c9c 573 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 574
72847ce0
JH		 575 chan->ops->teardown(chan, err);
576
8e87d142 577 if (conn) {
56f60984 578 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 579 /* Delete from channel list */
3df91ea2 580 list_del(&chan->list);
3d57dc68 581
371fd835 582 l2cap_chan_put(chan);
baa7e1fa 583
8c1d787b 584 chan->conn = NULL;
3cabbfda 585
c16900cf
JH		 586 /* Reference was only held for non-fixed channels or
587 * fixed channels that explicitly requested it using the
588 * FLAG_HOLD_HCI_CONN flag.
589 */
590 if (chan->chan_type != L2CAP_CHAN_FIXED ||
591 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
76a68ba0 592 hci_conn_drop(conn->hcon);
56f60984
AE		 593
594 if (mgr && mgr->bredr_chan == chan)
595 mgr->bredr_chan = NULL;
0139418c
MH		 596 }
597
419e08c1
AE		 598 if (chan->hs_hchan) {
599 struct hci_chan *hs_hchan = chan->hs_hchan;
600
601 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
602 amp_disconnect_logical_link(hs_hchan);
603 }
604
2827011f 605 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 606 return;
2ead70b8 607
ee556f66
GP		 608 switch(chan->mode) {
609 case L2CAP_MODE_BASIC:
610 break;
c13ffa62 611
38319713 612 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 613 skb_queue_purge(&chan->tx_q);
38319713
JH		 614 break;
615
ee556f66 616 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 617 __clear_retrans_timer(chan);
618 __clear_monitor_timer(chan);
619 __clear_ack_timer(chan);
c13ffa62 620
f1c6775b 621 skb_queue_purge(&chan->srej_q);
c13ffa62 622
3c588192
MM		 623 l2cap_seq_list_free(&chan->srej_list);
624 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 625
626 /* fall through */
627
628 case L2CAP_MODE_STREAMING:
629 skb_queue_purge(&chan->tx_q);
630 break;
c13ffa62 631 }
ee556f66
GP		 632
633 return;
0139418c 634}
6b8d4a6a 635EXPORT_SYMBOL_GPL(l2cap_chan_del);
0139418c 636
f3d82d0c 637static void l2cap_conn_update_id_addr(struct work_struct *work)
387a33e3 638{
f3d82d0c
JH		 639 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
640 id_addr_update_work);
641 struct hci_conn *hcon = conn->hcon;
387a33e3
JH		 642 struct l2cap_chan *chan;
643
644 mutex_lock(&conn->chan_lock);
645
646 list_for_each_entry(chan, &conn->chan_l, list) {
647 l2cap_chan_lock(chan);
648 bacpy(&chan->dst, &hcon->dst);
649 chan->dst_type = bdaddr_type(hcon, hcon->dst_type);
650 l2cap_chan_unlock(chan);
651 }
652
653 mutex_unlock(&conn->chan_lock);
654}
655
27e2d4c8
JH		 656static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
657{
658 struct l2cap_conn *conn = chan->conn;
659 struct l2cap_le_conn_rsp rsp;
660 u16 result;
661
662 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
663 result = L2CAP_CR_AUTHORIZATION;
664 else
665 result = L2CAP_CR_BAD_PSM;
666
667 l2cap_state_change(chan, BT_DISCONN);
668
669 rsp.dcid = cpu_to_le16(chan->scid);
670 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 671 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 672 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 673 rsp.result = cpu_to_le16(result);
674
675 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
676 &rsp);
677}
678
791d60f7
JH		 679static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
680{
681 struct l2cap_conn *conn = chan->conn;
682 struct l2cap_conn_rsp rsp;
683 u16 result;
684
685 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
686 result = L2CAP_CR_SEC_BLOCK;
687 else
688 result = L2CAP_CR_BAD_PSM;
689
690 l2cap_state_change(chan, BT_DISCONN);
691
692 rsp.scid = cpu_to_le16(chan->dcid);
693 rsp.dcid = cpu_to_le16(chan->scid);
694 rsp.result = cpu_to_le16(result);
dcf4adbf 695 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
791d60f7
JH		 696
697 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
698}
699
0f852724 700void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 701{
702 struct l2cap_conn *conn = chan->conn;
4519de9a 703
7eafc59e 704 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 705
89bc500e 706 switch (chan->state) {
4519de9a 707 case BT_LISTEN:
b699ec0d 708 chan->ops->teardown(chan, 0);
4519de9a
GP		 709 break;
710
711 case BT_CONNECTED:
712 case BT_CONFIG:
7b25c9b3 713 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
8d836d71 714 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 715 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 716 } else
717 l2cap_chan_del(chan, reason);
718 break;
719
720 case BT_CONNECT2:
791d60f7
JH		 721 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
722 if (conn->hcon->type == ACL_LINK)
723 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 724 else if (conn->hcon->type == LE_LINK)
725 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 726 }
727
728 l2cap_chan_del(chan, reason);
729 break;
730
731 case BT_CONNECT:
732 case BT_DISCONN:
733 l2cap_chan_del(chan, reason);
734 break;
735
736 default:
b699ec0d 737 chan->ops->teardown(chan, 0);
4519de9a
GP		 738 break;
739 }
740}
6b8d4a6a 741EXPORT_SYMBOL(l2cap_chan_close);
4519de9a 742
4343478f 743static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 744{
6a974b50
MH		 745 switch (chan->chan_type) {
746 case L2CAP_CHAN_RAW:
4343478f 747 switch (chan->sec_level) {
8556edd3 748 case BT_SECURITY_HIGH:
7d513e92 749 case BT_SECURITY_FIPS:
8556edd3
JH		 750 return HCI_AT_DEDICATED_BONDING_MITM;
751 case BT_SECURITY_MEDIUM:
752 return HCI_AT_DEDICATED_BONDING;
753 default:
754 return HCI_AT_NO_BONDING;
755 }
6a974b50 756 break;
3124b843 757 case L2CAP_CHAN_CONN_LESS:
dcf4adbf 758 if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) {
3124b843
MH		 759 if (chan->sec_level == BT_SECURITY_LOW)
760 chan->sec_level = BT_SECURITY_SDP;
761 }
7d513e92
MH		 762 if (chan->sec_level == BT_SECURITY_HIGH ||
763 chan->sec_level == BT_SECURITY_FIPS)
3124b843
MH		 764 return HCI_AT_NO_BONDING_MITM;
765 else
766 return HCI_AT_NO_BONDING;
767 break;
6a974b50 768 case L2CAP_CHAN_CONN_ORIENTED:
dcf4adbf 769 if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) {
6a974b50
MH		 770 if (chan->sec_level == BT_SECURITY_LOW)
771 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 772
7d513e92
MH		 773 if (chan->sec_level == BT_SECURITY_HIGH ||
774 chan->sec_level == BT_SECURITY_FIPS)
6a974b50
MH		 775 return HCI_AT_NO_BONDING_MITM;
776 else
777 return HCI_AT_NO_BONDING;
778 }
779 /* fall through */
780 default:
4343478f 781 switch (chan->sec_level) {
00ae4af9 782 case BT_SECURITY_HIGH:
7d513e92 783 case BT_SECURITY_FIPS:
8556edd3 784 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 785 case BT_SECURITY_MEDIUM:
8556edd3 786 return HCI_AT_GENERAL_BONDING;
00ae4af9 787 default:
8556edd3 788 return HCI_AT_NO_BONDING;
00ae4af9 789 }
6a974b50 790 break;
0684e5f9 791 }
8556edd3
JH		 792}
793
794/* Service level security */
e7cafc45 795int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator)
8556edd3 796{
8c1d787b 797 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 798 __u8 auth_type;
799
a17de2fe
JH		 800 if (conn->hcon->type == LE_LINK)
801 return smp_conn_security(conn->hcon, chan->sec_level);
802
4343478f 803 auth_type = l2cap_get_auth_type(chan);
79d554a6 804
e7cafc45
JH		 805 return hci_conn_security(conn->hcon, chan->sec_level, auth_type,
806 initiator);
79d554a6
MH		 807}
808
b5ad8b7f 809static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 810{
811 u8 id;
812
813 /* Get next available identificator.
814 * 1 - 128 are used by kernel.
815 * 129 - 199 are reserved.
816 * 200 - 254 are used by utilities like l2ping, etc.
817 */
818
5a54e7c8 819 mutex_lock(&conn->ident_lock);
4e8402a3
MH		 820
821 if (++conn->tx_ident > 128)
822 conn->tx_ident = 1;
823
824 id = conn->tx_ident;
825
5a54e7c8 826 mutex_unlock(&conn->ident_lock);
4e8402a3
MH		 827
828 return id;
829}
830
2d792818
GP		 831static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
832 void *data)
4e8402a3
MH		 833{
834 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 835 u8 flags;
4e8402a3
MH		 836
837 BT_DBG("code 0x%2.2x", code);
838
839 if (!skb)
9a9c6a34 840 return;
4e8402a3 841
e702112f
AE		 842 if (lmp_no_flush_capable(conn->hcon->hdev))
843 flags = ACL_START_NO_FLUSH;
844 else
845 flags = ACL_START;
846
14b12d0b 847 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 848 skb->priority = HCI_PRIO_MAX;
14b12d0b 849
73d80deb
LAD		 850 hci_send_acl(conn->hchan, skb, flags);
851}
852
02b0fbb9
MM		 853static bool __chan_is_moving(struct l2cap_chan *chan)
854{
855 return chan->move_state != L2CAP_MOVE_STABLE &&
856 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
857}
858
73d80deb
LAD		 859static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
860{
861 struct hci_conn *hcon = chan->conn->hcon;
862 u16 flags;
863
864 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 865 skb->priority);
73d80deb 866
d5f8a75d
MM		 867 if (chan->hs_hcon && !__chan_is_moving(chan)) {
868 if (chan->hs_hchan)
869 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
870 else
871 kfree_skb(skb);
872
873 return;
874 }
875
73d80deb 876 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 877 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 878 flags = ACL_START_NO_FLUSH;
879 else
880 flags = ACL_START;
14b12d0b 881
73d80deb
LAD		 882 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
883 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 884}
885
b76bbd66
MM		 886static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
887{
888 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
889 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
890
891 if (enh & L2CAP_CTRL_FRAME_TYPE) {
892 /* S-Frame */
893 control->sframe = 1;
894 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
895 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
896
897 control->sar = 0;
898 control->txseq = 0;
899 } else {
900 /* I-Frame */
901 control->sframe = 0;
902 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
903 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
904
905 control->poll = 0;
906 control->super = 0;
907 }
908}
909
b76bbd66
MM		 910static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
911{
912 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
913 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
914
915 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
916 /* S-Frame */
917 control->sframe = 1;
918 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
919 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
920
921 control->sar = 0;
922 control->txseq = 0;
923 } else {
924 /* I-Frame */
925 control->sframe = 0;
926 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
927 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
928
929 control->poll = 0;
930 control->super = 0;
931 }
932}
933
934static inline void __unpack_control(struct l2cap_chan *chan,
935 struct sk_buff *skb)
936{
937 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
938 __unpack_extended_control(get_unaligned_le32(skb->data),
939 &bt_cb(skb)->control);
cec8ab6e 940 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 941 } else {
942 __unpack_enhanced_control(get_unaligned_le16(skb->data),
943 &bt_cb(skb)->control);
cec8ab6e 944 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 945 }
946}
947
b5c6aaed
MM		 948static u32 __pack_extended_control(struct l2cap_ctrl *control)
949{
950 u32 packed;
951
952 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
953 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
954
955 if (control->sframe) {
956 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
957 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
958 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
959 } else {
960 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
961 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
962 }
963
964 return packed;
965}
966
967static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
968{
969 u16 packed;
970
971 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
972 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
973
974 if (control->sframe) {
975 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
976 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
977 packed |= L2CAP_CTRL_FRAME_TYPE;
978 } else {
979 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
980 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
981 }
982
983 return packed;
984}
985
b76bbd66
MM		 986static inline void __pack_control(struct l2cap_chan *chan,
987 struct l2cap_ctrl *control,
988 struct sk_buff *skb)
989{
990 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
991 put_unaligned_le32(__pack_extended_control(control),
992 skb->data + L2CAP_HDR_SIZE);
993 } else {
994 put_unaligned_le16(__pack_enhanced_control(control),
995 skb->data + L2CAP_HDR_SIZE);
996 }
997}
998
ba7aa64f
GP		 999static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
1000{
1001 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1002 return L2CAP_EXT_HDR_SIZE;
1003 else
1004 return L2CAP_ENH_HDR_SIZE;
1005}
1006
a67d7f6f
MM		 1007static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
1008 u32 control)
b5c6aaed
MM		 1009{
1010 struct sk_buff *skb;
1011 struct l2cap_hdr *lh;
ba7aa64f 1012 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 1013
1014 if (chan->fcs == L2CAP_FCS_CRC16)
1015 hlen += L2CAP_FCS_SIZE;
1016
a67d7f6f 1017 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 1018
b5c6aaed 1019 if (!skb)
a67d7f6f 1020 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 1021
1022 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1023 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1024 lh->cid = cpu_to_le16(chan->dcid);
1025
a67d7f6f
MM		 1026 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1027 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1028 else
1029 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 1030
1031 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 1032 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 1033 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1034 }
1035
1036 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 1037 return skb;
1038}
1039
1040static void l2cap_send_sframe(struct l2cap_chan *chan,
1041 struct l2cap_ctrl *control)
1042{
1043 struct sk_buff *skb;
1044 u32 control_field;
1045
1046 BT_DBG("chan %p, control %p", chan, control);
1047
1048 if (!control->sframe)
1049 return;
1050
b99e13ad
MM		 1051 if (__chan_is_moving(chan))
1052 return;
1053
a67d7f6f
MM		 1054 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1055 !control->poll)
1056 control->final = 1;
1057
1058 if (control->super == L2CAP_SUPER_RR)
1059 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1060 else if (control->super == L2CAP_SUPER_RNR)
1061 set_bit(CONN_RNR_SENT, &chan->conn_state);
1062
1063 if (control->super != L2CAP_SUPER_SREJ) {
1064 chan->last_acked_seq = control->reqseq;
1065 __clear_ack_timer(chan);
1066 }
1067
1068 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1069 control->final, control->poll, control->super);
1070
1071 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1072 control_field = __pack_extended_control(control);
1073 else
1074 control_field = __pack_enhanced_control(control);
1075
1076 skb = l2cap_create_sframe_pdu(chan, control_field);
1077 if (!IS_ERR(skb))
1078 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1079}
1080
c9e3d5e0 1081static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1082{
c9e3d5e0
MM		 1083 struct l2cap_ctrl control;
1084
1085 BT_DBG("chan %p, poll %d", chan, poll);
1086
1087 memset(&control, 0, sizeof(control));
1088 control.sframe = 1;
1089 control.poll = poll;
1090
1091 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1092 control.super = L2CAP_SUPER_RNR;
1093 else
1094 control.super = L2CAP_SUPER_RR;
b5c6aaed 1095
c9e3d5e0
MM		 1096 control.reqseq = chan->buffer_seq;
1097 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1098}
1099
b4450035 1100static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1101{
5ff6f34d
JH		 1102 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
1103 return true;
1104
c1360a1c 1105 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1106}
1107
1df7b17a 1108static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1109{
1df7b17a 1110 struct l2cap_conn *conn = chan->conn;
80d58d0b 1111 struct hci_dev *hdev;
1df7b17a
MH		 1112 bool amp_available = false;
1113
1114 if (!conn->hs_enabled)
1115 return false;
1116
1117 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1118 return false;
80d58d0b
MH		 1119
1120 read_lock(&hci_dev_list_lock);
1df7b17a 1121 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1122 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1123 test_bit(HCI_UP, &hdev->flags)) {
1124 amp_available = true;
1125 break;
1126 }
1127 }
80d58d0b
MH		 1128 read_unlock(&hci_dev_list_lock);
1129
1df7b17a
MH		 1130 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1131 return amp_available;
848566b3
MH		 1132
1133 return false;
93c3e8f5
AE		 1134}
1135
5ce66b59
AE		 1136static bool l2cap_check_efs(struct l2cap_chan *chan)
1137{
1138 /* Check EFS parameters */
1139 return true;
1140}
1141
2766be48 1142void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1143{
1144 struct l2cap_conn *conn = chan->conn;
1145 struct l2cap_conn_req req;
1146
1147 req.scid = cpu_to_le16(chan->scid);
1148 req.psm = chan->psm;
1149
1150 chan->ident = l2cap_get_ident(conn);
1151
1152 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1153
1154 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1155}
1156
8eb200bd
MM		 1157static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1158{
1159 struct l2cap_create_chan_req req;
1160 req.scid = cpu_to_le16(chan->scid);
1161 req.psm = chan->psm;
1162 req.amp_id = amp_id;
1163
1164 chan->ident = l2cap_get_ident(chan->conn);
1165
1166 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1167 sizeof(req), &req);
1168}
1169
02b0fbb9
MM		 1170static void l2cap_move_setup(struct l2cap_chan *chan)
1171{
1172 struct sk_buff *skb;
1173
1174 BT_DBG("chan %p", chan);
1175
1176 if (chan->mode != L2CAP_MODE_ERTM)
1177 return;
1178
1179 __clear_retrans_timer(chan);
1180 __clear_monitor_timer(chan);
1181 __clear_ack_timer(chan);
1182
1183 chan->retry_count = 0;
1184 skb_queue_walk(&chan->tx_q, skb) {
1185 if (bt_cb(skb)->control.retries)
1186 bt_cb(skb)->control.retries = 1;
1187 else
1188 break;
1189 }
1190
1191 chan->expected_tx_seq = chan->buffer_seq;
1192
1193 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1194 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1195 l2cap_seq_list_clear(&chan->retrans_list);
1196 l2cap_seq_list_clear(&chan->srej_list);
1197 skb_queue_purge(&chan->srej_q);
1198
1199 chan->tx_state = L2CAP_TX_STATE_XMIT;
1200 chan->rx_state = L2CAP_RX_STATE_MOVE;
1201
1202 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1203}
1204
5f3847a4
MM		 1205static void l2cap_move_done(struct l2cap_chan *chan)
1206{
1207 u8 move_role = chan->move_role;
1208 BT_DBG("chan %p", chan);
1209
1210 chan->move_state = L2CAP_MOVE_STABLE;
1211 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1212
1213 if (chan->mode != L2CAP_MODE_ERTM)
1214 return;
1215
1216 switch (move_role) {
1217 case L2CAP_MOVE_ROLE_INITIATOR:
1218 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1219 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1220 break;
1221 case L2CAP_MOVE_ROLE_RESPONDER:
1222 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1223 break;
1224 }
1225}
1226
9f0caeb1
VCG		 1227static void l2cap_chan_ready(struct l2cap_chan *chan)
1228{
2827011f 1229 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1230 chan->conf_state = 0;
1231 __clear_chan_timer(chan);
1232
0ce43ce6
JH		 1233 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1234 chan->ops->suspend(chan);
177f8f2b 1235
54a59aa2 1236 chan->state = BT_CONNECTED;
9f0caeb1 1237
fd83e2c2 1238 chan->ops->ready(chan);
9f0caeb1
VCG		 1239}
1240
f1496dee
JH		 1241static void l2cap_le_connect(struct l2cap_chan *chan)
1242{
1243 struct l2cap_conn *conn = chan->conn;
1244 struct l2cap_le_conn_req req;
1245
595177f3
JH		 1246 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1247 return;
1248
f1496dee
JH		 1249 req.psm = chan->psm;
1250 req.scid = cpu_to_le16(chan->scid);
1251 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1252 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1253 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1254
1255 chan->ident = l2cap_get_ident(conn);
1256
1257 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1258 sizeof(req), &req);
1259}
1260
1261static void l2cap_le_start(struct l2cap_chan *chan)
1262{
1263 struct l2cap_conn *conn = chan->conn;
1264
1265 if (!smp_conn_security(conn->hcon, chan->sec_level))
1266 return;
1267
1268 if (!chan->psm) {
1269 l2cap_chan_ready(chan);
1270 return;
1271 }
1272
1273 if (chan->state == BT_CONNECT)
1274 l2cap_le_connect(chan);
1275}
1276
93c3e8f5
AE		 1277static void l2cap_start_connection(struct l2cap_chan *chan)
1278{
1279 if (__amp_capable(chan)) {
1280 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1281 a2mp_discover_amp(chan);
f1496dee
JH		 1282 } else if (chan->conn->hcon->type == LE_LINK) {
1283 l2cap_le_start(chan);
93c3e8f5
AE		 1284 } else {
1285 l2cap_send_conn_req(chan);
1286 }
1287}
1288
aeaeb4bb
JH		 1289static void l2cap_request_info(struct l2cap_conn *conn)
1290{
1291 struct l2cap_info_req req;
1292
1293 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1294 return;
1295
1296 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1297
1298 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1299 conn->info_ident = l2cap_get_ident(conn);
1300
1301 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1302
1303 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1304 sizeof(req), &req);
1305}
1306
fc7f8a7e 1307static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1308{
8c1d787b 1309 struct l2cap_conn *conn = chan->conn;
79d554a6 1310
9f0caeb1 1311 if (conn->hcon->type == LE_LINK) {
96ac34fb 1312 l2cap_le_start(chan);
9f0caeb1
VCG		 1313 return;
1314 }
1315
aeaeb4bb
JH		 1316 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) {
1317 l2cap_request_info(conn);
1318 return;
1319 }
79d554a6 1320
aeaeb4bb
JH		 1321 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1322 return;
79d554a6 1323
aeaeb4bb
JH		 1324 if (l2cap_chan_check_security(chan, true) &&
1325 __l2cap_no_conn_pending(chan))
1326 l2cap_start_connection(chan);
79d554a6
MH		 1327}
1328
cf6c2c0b
GP		 1329static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1330{
1331 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1332 if (!disable_ertm)
cf6c2c0b
GP		 1333 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1334
1335 switch (mode) {
1336 case L2CAP_MODE_ERTM:
1337 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1338 case L2CAP_MODE_STREAMING:
1339 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1340 default:
1341 return 0x00;
1342 }
1343}
1344
5e4e3972 1345static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1346{
5e4e3972 1347 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1348 struct l2cap_disconn_req req;
1349
c13ffa62
GP		 1350 if (!conn)
1351 return;
1352
aad3d0e3 1353 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1354 __clear_retrans_timer(chan);
1355 __clear_monitor_timer(chan);
1356 __clear_ack_timer(chan);
c13ffa62
GP		 1357 }
1358
2338a7e0 1359 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1360 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1361 return;
1362 }
1363
fe4128e0
GP		 1364 req.dcid = cpu_to_le16(chan->dcid);
1365 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1366 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1367 sizeof(req), &req);
c13ffa62 1368
f8e73017 1369 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1370}
1371
1da177e4 1372/* ---- L2CAP connections ---- */
4e8402a3
MH		 1373static void l2cap_conn_start(struct l2cap_conn *conn)
1374{
3df91ea2 1375 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1376
1377 BT_DBG("conn %p", conn);
1378
3df91ea2 1379 mutex_lock(&conn->chan_lock);
4e8402a3 1380
3df91ea2 1381 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1382 l2cap_chan_lock(chan);
4e8402a3 1383
715ec005 1384 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb 1385 l2cap_chan_ready(chan);
6be36555 1386 l2cap_chan_unlock(chan);
79d554a6
MH		 1387 continue;
1388 }
1389
89bc500e 1390 if (chan->state == BT_CONNECT) {
e7cafc45 1391 if (!l2cap_chan_check_security(chan, true) ||
2d792818 1392 !__l2cap_no_conn_pending(chan)) {
6be36555 1393 l2cap_chan_unlock(chan);
47731de7
GP		 1394 continue;
1395 }
79d554a6 1396
c1360a1c 1397 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1398 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1399 &chan->conf_state)) {
89bc500e 1400 l2cap_chan_close(chan, ECONNRESET);
6be36555 1401 l2cap_chan_unlock(chan);
47731de7 1402 continue;
b1235d79 1403 }
47731de7 1404
93c3e8f5 1405 l2cap_start_connection(chan);
47731de7 1406
89bc500e 1407 } else if (chan->state == BT_CONNECT2) {
79d554a6 1408 struct l2cap_conn_rsp rsp;
e9aeb2dd 1409 char buf[128];
fe4128e0
GP		 1410 rsp.scid = cpu_to_le16(chan->dcid);
1411 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1412
e7cafc45 1413 if (l2cap_chan_check_security(chan, false)) {
bdc25783 1414 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
dcf4adbf
JP		 1415 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1416 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1417 chan->ops->defer(chan);
f66dc81f
MH		 1418
1419 } else {
acdcabf5 1420 l2cap_state_change(chan, BT_CONFIG);
dcf4adbf
JP		 1421 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1422 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1423 }
79d554a6 1424 } else {
dcf4adbf
JP		 1425 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1426 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1427 }
1428
fc7f8a7e 1429 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1430 sizeof(rsp), &rsp);
e9aeb2dd 1431
c1360a1c 1432 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1433 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1434 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1435 continue;
1436 }
1437
c1360a1c 1438 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1439 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1440 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1441 chan->num_conf_req++;
4e8402a3
MH		 1442 }
1443
6be36555 1444 l2cap_chan_unlock(chan);
4e8402a3
MH		 1445 }
1446
3df91ea2 1447 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1448}
1449
b62f328b
VT		 1450static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1451{
cc8dba2b 1452 struct hci_conn *hcon = conn->hcon;
dcc36c16 1453 struct hci_dev *hdev = hcon->hdev;
b62f328b 1454
e760ec12 1455 BT_DBG("%s conn %p", hdev->name, conn);
b62f328b 1456
e760ec12
JH		 1457 /* For outgoing pairing which doesn't necessarily have an
1458 * associated socket (e.g. mgmt_pair_device).
1459 */
1460 if (hcon->out)
1461 smp_conn_security(hcon, hcon->pending_sec_level);
cc8dba2b 1462
80afeb6c
MH		 1463 /* For LE slave connections, make sure the connection interval
1464 * is in the range of the minium and maximum interval that has
1465 * been configured for this connection. If not, then trigger
1466 * the connection update procedure.
1467 */
40bef302 1468 if (hcon->role == HCI_ROLE_SLAVE &&
80afeb6c
MH		 1469 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1470 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1471 struct l2cap_conn_param_update_req req;
1472
1473 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1474 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1475 req.latency = cpu_to_le16(hcon->le_conn_latency);
1476 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1477
1478 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1479 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1480 }
b62f328b
VT		 1481}
1482
4e8402a3
MH		 1483static void l2cap_conn_ready(struct l2cap_conn *conn)
1484{
48454079 1485 struct l2cap_chan *chan;
cc110922 1486 struct hci_conn *hcon = conn->hcon;
4e8402a3 1487
79d554a6 1488 BT_DBG("conn %p", conn);
4e8402a3 1489
aeaeb4bb
JH		 1490 if (hcon->type == ACL_LINK)
1491 l2cap_request_info(conn);
1492
e760ec12
JH		 1493 mutex_lock(&conn->chan_lock);
1494
3df91ea2 1495 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1496
6be36555 1497 l2cap_chan_lock(chan);
4e8402a3 1498
2338a7e0 1499 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1500 l2cap_chan_unlock(chan);
1501 continue;
1502 }
1503
cc110922 1504 if (hcon->type == LE_LINK) {
f1496dee 1505 l2cap_le_start(chan);
63128451 1506 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb
JH		 1507 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
1508 l2cap_chan_ready(chan);
1c244f79 1509 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1510 l2cap_do_start(chan);
1c244f79 1511 }
4e8402a3 1512
6be36555 1513 l2cap_chan_unlock(chan);
4e8402a3 1514 }
79d554a6 1515
3df91ea2 1516 mutex_unlock(&conn->chan_lock);
61a939c6 1517
79a05727
JH		 1518 if (hcon->type == LE_LINK)
1519 l2cap_le_conn_ready(conn);
1520
61a939c6 1521 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1522}
1523
1524/* Notify sockets that we cannot guaranty reliability anymore */
1525static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1526{
48454079 1527 struct l2cap_chan *chan;
4e8402a3
MH		 1528
1529 BT_DBG("conn %p", conn);
1530
3df91ea2 1531 mutex_lock(&conn->chan_lock);
4e8402a3 1532
3df91ea2 1533 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1534 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1535 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1536 }
1537
3df91ea2 1538 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1539}
1540
f878fcad 1541static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1542{
f878fcad 1543 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1544 info_timer.work);
4e8402a3 1545
984947dc 1546 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1547 conn->info_ident = 0;
984947dc 1548
4e8402a3
MH		 1549 l2cap_conn_start(conn);
1550}
1551
2c8e1411
DH		 1552/*
1553 * l2cap_user
1554 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1555 * callback is called during registration. The ->remove callback is called
1556 * during unregistration.
1557 * An l2cap_user object can either be explicitly unregistered or when the
1558 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1559 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1560 * External modules must own a reference to the l2cap_conn object if they intend
1561 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1562 * any time if they don't.
1563 */
1564
1565int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1566{
1567 struct hci_dev *hdev = conn->hcon->hdev;
1568 int ret;
1569
1570 /* We need to check whether l2cap_conn is registered. If it is not, we
1571 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1572 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1573 * relies on the parent hci_conn object to be locked. This itself relies
1574 * on the hci_dev object to be locked. So we must lock the hci device
1575 * here, too. */
1576
1577 hci_dev_lock(hdev);
1578
1579 if (user->list.next || user->list.prev) {
1580 ret = -EINVAL;
1581 goto out_unlock;
1582 }
1583
1584 /* conn->hchan is NULL after l2cap_conn_del() was called */
1585 if (!conn->hchan) {
1586 ret = -ENODEV;
1587 goto out_unlock;
1588 }
1589
1590 ret = user->probe(conn, user);
1591 if (ret)
1592 goto out_unlock;
1593
1594 list_add(&user->list, &conn->users);
1595 ret = 0;
1596
1597out_unlock:
1598 hci_dev_unlock(hdev);
1599 return ret;
1600}
1601EXPORT_SYMBOL(l2cap_register_user);
1602
1603void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1604{
1605 struct hci_dev *hdev = conn->hcon->hdev;
1606
1607 hci_dev_lock(hdev);
1608
1609 if (!user->list.next || !user->list.prev)
1610 goto out_unlock;
1611
1612 list_del(&user->list);
1613 user->list.next = NULL;
1614 user->list.prev = NULL;
1615 user->remove(conn, user);
1616
1617out_unlock:
1618 hci_dev_unlock(hdev);
1619}
1620EXPORT_SYMBOL(l2cap_unregister_user);
1621
1622static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1623{
1624 struct l2cap_user *user;
1625
1626 while (!list_empty(&conn->users)) {
1627 user = list_first_entry(&conn->users, struct l2cap_user, list);
1628 list_del(&user->list);
1629 user->list.next = NULL;
1630 user->list.prev = NULL;
1631 user->remove(conn, user);
1632 }
1633}
1634
5d3de7df
VCG		 1635static void l2cap_conn_del(struct hci_conn *hcon, int err)
1636{
1637 struct l2cap_conn *conn = hcon->l2cap_data;
1638 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1639
1640 if (!conn)
1641 return;
1642
1643 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1644
1645 kfree_skb(conn->rx_skb);
1646
61a939c6 1647 skb_queue_purge(&conn->pending_rx);
7ab56c3a
JT		 1648
1649 /* We can not call flush_work(&conn->pending_rx_work) here since we
1650 * might block if we are running on a worker from the same workqueue
1651 * pending_rx_work is waiting on.
1652 */
1653 if (work_pending(&conn->pending_rx_work))
1654 cancel_work_sync(&conn->pending_rx_work);
61a939c6 1655
f3d82d0c
JH		 1656 if (work_pending(&conn->id_addr_update_work))
1657 cancel_work_sync(&conn->id_addr_update_work);
1658
2c8e1411
DH		 1659 l2cap_unregister_all_users(conn);
1660
e31fb860
JH		 1661 /* Force the connection to be immediately dropped */
1662 hcon->disc_timeout = 0;
1663
3df91ea2
AE		 1664 mutex_lock(&conn->chan_lock);
1665
5d3de7df
VCG		 1666 /* Kill channels */
1667 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1668 l2cap_chan_hold(chan);
6be36555
AE		 1669 l2cap_chan_lock(chan);
1670
5d3de7df 1671 l2cap_chan_del(chan, err);
6be36555
AE		 1672
1673 l2cap_chan_unlock(chan);
1674
80b98027 1675 chan->ops->close(chan);
61d6ef3e 1676 l2cap_chan_put(chan);
5d3de7df
VCG		 1677 }
1678
3df91ea2
AE		 1679 mutex_unlock(&conn->chan_lock);
1680
73d80deb
LAD		 1681 hci_chan_del(conn->hchan);
1682
5d3de7df 1683 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1684 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1685
5d3de7df 1686 hcon->l2cap_data = NULL;
9c903e37
DH		 1687 conn->hchan = NULL;
1688 l2cap_conn_put(conn);
5d3de7df
VCG		 1689}
1690
9c903e37
DH		 1691static void l2cap_conn_free(struct kref *ref)
1692{
1693 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1694
1695 hci_conn_put(conn->hcon);
1696 kfree(conn);
1697}
1698
51bb8457 1699struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
9c903e37
DH		 1700{
1701 kref_get(&conn->ref);
51bb8457 1702 return conn;
9c903e37
DH		 1703}
1704EXPORT_SYMBOL(l2cap_conn_get);
1705
1706void l2cap_conn_put(struct l2cap_conn *conn)
1707{
1708 kref_put(&conn->ref, l2cap_conn_free);
1709}
1710EXPORT_SYMBOL(l2cap_conn_put);
1711
1da177e4 1712/* ---- Socket interface ---- */
1da177e4 1713
c2287681 1714/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1715 * Returns closest match.
1716 */
c2287681
IY		 1717static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1718 bdaddr_t *src,
bf20fd4e
JH		 1719 bdaddr_t *dst,
1720 u8 link_type)
1da177e4 1721{
23691d75 1722 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1723
23691d75 1724 read_lock(&chan_list_lock);
e0f0cb56 1725
23691d75 1726 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1727 if (state && c->state != state)
1da177e4
LT		 1728 continue;
1729
bf20fd4e
JH		 1730 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1731 continue;
1732
1733 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1734 continue;
1735
23691d75 1736 if (c->psm == psm) {
c2287681
IY		 1737 int src_match, dst_match;
1738 int src_any, dst_any;
1739
1da177e4 1740 /* Exact match. */
7eafc59e
MH		 1741 src_match = !bacmp(&c->src, src);
1742 dst_match = !bacmp(&c->dst, dst);
c2287681 1743 if (src_match && dst_match) {
a24cce14 1744 l2cap_chan_hold(c);
a7567b20 1745 read_unlock(&chan_list_lock);
23691d75
GP		 1746 return c;
1747 }
1da177e4
LT		 1748
1749 /* Closest match */
7eafc59e
MH		 1750 src_any = !bacmp(&c->src, BDADDR_ANY);
1751 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1752 if ((src_match && dst_any) || (src_any && dst_match) ||
1753 (src_any && dst_any))
23691d75 1754 c1 = c;
1da177e4
LT		 1755 }
1756 }
1da177e4 1757
a24cce14
JH		 1758 if (c1)
1759 l2cap_chan_hold(c1);
1760
23691d75 1761 read_unlock(&chan_list_lock);
e0f0cb56 1762
23691d75 1763 return c1;
1da177e4
LT		 1764}
1765
721c4181 1766static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1767{
721c4181 1768 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1769 monitor_timer.work);
e90bac06 1770
525cd185 1771 BT_DBG("chan %p", chan);
0e98958d 1772
6be36555
AE		 1773 l2cap_chan_lock(chan);
1774
80909e04 1775 if (!chan->conn) {
6be36555 1776 l2cap_chan_unlock(chan);
8d7e1c7f 1777 l2cap_chan_put(chan);
e90bac06
GP		 1778 return;
1779 }
1780
401bb1f7 1781 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1782
6be36555 1783 l2cap_chan_unlock(chan);
8d7e1c7f 1784 l2cap_chan_put(chan);
e90bac06
GP		 1785}
1786
721c4181 1787static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1788{
721c4181 1789 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1790 retrans_timer.work);
e90bac06 1791
49208c9c 1792 BT_DBG("chan %p", chan);
0e98958d 1793
6be36555
AE		 1794 l2cap_chan_lock(chan);
1795
80909e04
MM		 1796 if (!chan->conn) {
1797 l2cap_chan_unlock(chan);
1798 l2cap_chan_put(chan);
1799 return;
1800 }
6be36555 1801
401bb1f7 1802 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1803 l2cap_chan_unlock(chan);
8d7e1c7f 1804 l2cap_chan_put(chan);
e90bac06
GP		 1805}
1806
d660366d
GP		 1807static void l2cap_streaming_send(struct l2cap_chan *chan,
1808 struct sk_buff_head *skbs)
6840ed07 1809{
ccbb84af 1810 struct sk_buff *skb;
3733937d 1811 struct l2cap_ctrl *control;
6840ed07 1812
3733937d
MM		 1813 BT_DBG("chan %p, skbs %p", chan, skbs);
1814
b99e13ad
MM		 1815 if (__chan_is_moving(chan))
1816 return;
1817
3733937d
MM		 1818 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1819
1820 while (!skb_queue_empty(&chan->tx_q)) {
1821
1822 skb = skb_dequeue(&chan->tx_q);
1823
1824 bt_cb(skb)->control.retries = 1;
1825 control = &bt_cb(skb)->control;
1826
1827 control->reqseq = 0;
1828 control->txseq = chan->next_tx_seq;
1829
1830 __pack_control(chan, control, skb);
6840ed07 1831
47d1ec61 1832 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1833 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1834 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1835 }
1836
4343478f 1837 l2cap_do_send(chan, skb);
6840ed07 1838
b4400672 1839 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1840
836be934 1841 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1842 chan->frames_sent++;
6840ed07 1843 }
6840ed07
GP		 1844}
1845
67c9e840 1846static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1847{
1848 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1849 struct l2cap_ctrl *control;
1850 int sent = 0;
1851
1852 BT_DBG("chan %p", chan);
1c2acffb 1853
89bc500e 1854 if (chan->state != BT_CONNECTED)
c13ffa62 1855 return -ENOTCONN;
e90bac06 1856
94122bbe
MM		 1857 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1858 return 0;
1859
b99e13ad
MM		 1860 if (__chan_is_moving(chan))
1861 return 0;
1862
18a48e76
MM		 1863 while (chan->tx_send_head &&
1864 chan->unacked_frames < chan->remote_tx_win &&
1865 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1866
18a48e76 1867 skb = chan->tx_send_head;
e90bac06 1868
18a48e76
MM		 1869 bt_cb(skb)->control.retries = 1;
1870 control = &bt_cb(skb)->control;
95ffa978 1871
e2ab4353 1872 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1873 control->final = 1;
e2ab4353 1874
18a48e76
MM		 1875 control->reqseq = chan->buffer_seq;
1876 chan->last_acked_seq = chan->buffer_seq;
1877 control->txseq = chan->next_tx_seq;
1c2acffb 1878
18a48e76 1879 __pack_control(chan, control, skb);
e90bac06 1880
47d1ec61 1881 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1882 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1883 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1884 }
1885
18a48e76
MM		 1886 /* Clone after data has been modified. Data is assumed to be
1887 read-only (for locking purposes) on cloned sk_buffs.
1888 */
1889 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1890
18a48e76
MM		 1891 if (!tx_skb)
1892 break;
1c2acffb 1893
18a48e76 1894 __set_retrans_timer(chan);
836be934
AE		 1895
1896 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1897 chan->unacked_frames++;
6a026610 1898 chan->frames_sent++;
18a48e76 1899 sent++;
1c2acffb 1900
58d35f87
GP		 1901 if (skb_queue_is_last(&chan->tx_q, skb))
1902 chan->tx_send_head = NULL;
1c2acffb 1903 else
58d35f87 1904 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1905
1906 l2cap_do_send(chan, tx_skb);
b4400672 1907 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1908 }
1909
b4400672
AE		 1910 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1911 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1912
1913 return sent;
9e917af1
GP		 1914}
1915
e1fbd4c1
MM		 1916static void l2cap_ertm_resend(struct l2cap_chan *chan)
1917{
1918 struct l2cap_ctrl control;
1919 struct sk_buff *skb;
1920 struct sk_buff *tx_skb;
1921 u16 seq;
1922
1923 BT_DBG("chan %p", chan);
1924
1925 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1926 return;
1927
b99e13ad
MM		 1928 if (__chan_is_moving(chan))
1929 return;
1930
e1fbd4c1
MM		 1931 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1932 seq = l2cap_seq_list_pop(&chan->retrans_list);
1933
1934 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1935 if (!skb) {
1936 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1937 seq);
e1fbd4c1
MM		 1938 continue;
1939 }
1940
1941 bt_cb(skb)->control.retries++;
1942 control = bt_cb(skb)->control;
1943
1944 if (chan->max_tx != 0 &&
1945 bt_cb(skb)->control.retries > chan->max_tx) {
1946 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1947 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1948 l2cap_seq_list_clear(&chan->retrans_list);
1949 break;
1950 }
1951
1952 control.reqseq = chan->buffer_seq;
1953 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1954 control.final = 1;
1955 else
1956 control.final = 0;
1957
1958 if (skb_cloned(skb)) {
1959 /* Cloned sk_buffs are read-only, so we need a
1960 * writeable copy
1961 */
8bcde1f2 1962 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1963 } else {
8bcde1f2 1964 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1965 }
1966
1967 if (!tx_skb) {
1968 l2cap_seq_list_clear(&chan->retrans_list);
1969 break;
1970 }
1971
1972 /* Update skb contents */
1973 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1974 put_unaligned_le32(__pack_extended_control(&control),
1975 tx_skb->data + L2CAP_HDR_SIZE);
1976 } else {
1977 put_unaligned_le16(__pack_enhanced_control(&control),
1978 tx_skb->data + L2CAP_HDR_SIZE);
1979 }
1980
13cac152 1981 /* Update FCS */
e1fbd4c1 1982 if (chan->fcs == L2CAP_FCS_CRC16) {
13cac152
LR		 1983 u16 fcs = crc16(0, (u8 *) tx_skb->data,
1984 tx_skb->len - L2CAP_FCS_SIZE);
1985 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
1986 L2CAP_FCS_SIZE);
e1fbd4c1
MM		 1987 }
1988
1989 l2cap_do_send(chan, tx_skb);
1990
1991 BT_DBG("Resent txseq %d", control.txseq);
1992
1993 chan->last_acked_seq = chan->buffer_seq;
1994 }
1995}
1996
f80842a8
MM		 1997static void l2cap_retransmit(struct l2cap_chan *chan,
1998 struct l2cap_ctrl *control)
1999{
2000 BT_DBG("chan %p, control %p", chan, control);
2001
2002 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2003 l2cap_ertm_resend(chan);
2004}
2005
d2a7ac5d
MM		 2006static void l2cap_retransmit_all(struct l2cap_chan *chan,
2007 struct l2cap_ctrl *control)
2008{
e1fbd4c1
MM		 2009 struct sk_buff *skb;
2010
2011 BT_DBG("chan %p, control %p", chan, control);
2012
2013 if (control->poll)
2014 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2015
2016 l2cap_seq_list_clear(&chan->retrans_list);
2017
2018 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2019 return;
2020
2021 if (chan->unacked_frames) {
2022 skb_queue_walk(&chan->tx_q, skb) {
2023 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2024 skb == chan->tx_send_head)
e1fbd4c1
MM		 2025 break;
2026 }
2027
2028 skb_queue_walk_from(&chan->tx_q, skb) {
2029 if (skb == chan->tx_send_head)
2030 break;
2031
2032 l2cap_seq_list_append(&chan->retrans_list,
2033 bt_cb(skb)->control.txseq);
2034 }
2035
2036 l2cap_ertm_resend(chan);
2037 }
d2a7ac5d
MM		 2038}
2039
0a0aba42 2040static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2041{
0a0aba42
MM		 2042 struct l2cap_ctrl control;
2043 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2044 chan->last_acked_seq);
2045 int threshold;
9e917af1 2046
0a0aba42
MM		 2047 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2048 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2049
0a0aba42
MM		 2050 memset(&control, 0, sizeof(control));
2051 control.sframe = 1;
dfc909be 2052
0a0aba42
MM		 2053 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2054 chan->rx_state == L2CAP_RX_STATE_RECV) {
2055 __clear_ack_timer(chan);
2056 control.super = L2CAP_SUPER_RNR;
2057 control.reqseq = chan->buffer_seq;
2058 l2cap_send_sframe(chan, &control);
2059 } else {
2060 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2061 l2cap_ertm_send(chan);
2062 /* If any i-frames were sent, they included an ack */
2063 if (chan->buffer_seq == chan->last_acked_seq)
2064 frames_to_ack = 0;
2065 }
dfc909be 2066
c20f8e35 2067 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2068 * Calculate without mul or div
2069 */
c20f8e35 2070 threshold = chan->ack_win;
0a0aba42
MM		 2071 threshold += threshold << 1;
2072 threshold >>= 2;
2073
b4400672 2074 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2075 threshold);
2076
2077 if (frames_to_ack >= threshold) {
2078 __clear_ack_timer(chan);
2079 control.super = L2CAP_SUPER_RR;
2080 control.reqseq = chan->buffer_seq;
2081 l2cap_send_sframe(chan, &control);
2082 frames_to_ack = 0;
2083 }
1c2acffb 2084
0a0aba42
MM		 2085 if (frames_to_ack)
2086 __set_ack_timer(chan);
2087 }
b17e73bb
SJ		 2088}
2089
04124681
GP		 2090static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2091 struct msghdr *msg, int len,
2092 int count, struct sk_buff *skb)
1c2acffb 2093{
0952a57a 2094 struct l2cap_conn *conn = chan->conn;
1c2acffb 2095 struct sk_buff **frag;
90338947 2096 int sent = 0;
1da177e4 2097
0498878b
JR		 2098 if (chan->ops->memcpy_fromiovec(chan, skb_put(skb, count),
2099 msg->msg_iov, count))
1c2acffb 2100 return -EFAULT;
1da177e4
LT		 2101
2102 sent += count;
2103 len -= count;
2104
2105 /* Continuation fragments (no L2CAP header) */
2106 frag = &skb_shinfo(skb)->frag_list;
2107 while (len) {
fbe00700
GP		 2108 struct sk_buff *tmp;
2109
1da177e4
LT		 2110 count = min_t(unsigned int, conn->mtu, len);
2111
d9fbd02b 2112 tmp = chan->ops->alloc_skb(chan, 0, count,
fbe00700
GP		 2113 msg->msg_flags & MSG_DONTWAIT);
2114 if (IS_ERR(tmp))
2115 return PTR_ERR(tmp);
2116
2117 *frag = tmp;
2f7719ce 2118
0498878b
JR		 2119 if (chan->ops->memcpy_fromiovec(chan, skb_put(*frag, count),
2120 msg->msg_iov, count))
1c2acffb 2121 return -EFAULT;
1da177e4
LT		 2122
2123 sent += count;
2124 len -= count;
2125
2d0ed3d5
GP		 2126 skb->len += (*frag)->len;
2127 skb->data_len += (*frag)->len;
2128
1da177e4
LT		 2129 frag = &(*frag)->next;
2130 }
1da177e4
LT		 2131
2132 return sent;
1c2acffb 2133}
1da177e4 2134
5e59b791 2135static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
8d46321c 2136 struct msghdr *msg, size_t len)
1c2acffb 2137{
8c1d787b 2138 struct l2cap_conn *conn = chan->conn;
1c2acffb 2139 struct sk_buff *skb;
03a51213 2140 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2141 struct l2cap_hdr *lh;
2142
8d46321c
MH		 2143 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2144 __le16_to_cpu(chan->psm), len);
1c2acffb
GP		 2145
2146 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2147
d9fbd02b 2148 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2149 msg->msg_flags & MSG_DONTWAIT);
2150 if (IS_ERR(skb))
2151 return skb;
1c2acffb
GP		 2152
2153 /* Create L2CAP header */
2154 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2155 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2156 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2157 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2158
0952a57a 2159 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2160 if (unlikely(err < 0)) {
2161 kfree_skb(skb);
2162 return ERR_PTR(err);
2163 }
2164 return skb;
2165}
2166
5e59b791 2167static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
8d46321c 2168 struct msghdr *msg, size_t len)
1c2acffb 2169{
8c1d787b 2170 struct l2cap_conn *conn = chan->conn;
1c2acffb 2171 struct sk_buff *skb;
f2ba7fae 2172 int err, count;
1c2acffb
GP		 2173 struct l2cap_hdr *lh;
2174
b4400672 2175 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2176
f2ba7fae 2177 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2178
d9fbd02b 2179 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
90338947
GP		 2180 msg->msg_flags & MSG_DONTWAIT);
2181 if (IS_ERR(skb))
2182 return skb;
1c2acffb
GP		 2183
2184 /* Create L2CAP header */
2185 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2186 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2187 lh->len = cpu_to_le16(len);
1c2acffb 2188
0952a57a 2189 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2190 if (unlikely(err < 0)) {
2191 kfree_skb(skb);
2192 return ERR_PTR(err);
2193 }
2194 return skb;
2195}
2196
ab0ff76d 2197static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2198 struct msghdr *msg, size_t len,
2199 u16 sdulen)
1c2acffb 2200{
8c1d787b 2201 struct l2cap_conn *conn = chan->conn;
1c2acffb 2202 struct sk_buff *skb;
e4ca6d98 2203 int err, count, hlen;
1c2acffb
GP		 2204 struct l2cap_hdr *lh;
2205
b4400672 2206 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2207
0ee0d208
GP		 2208 if (!conn)
2209 return ERR_PTR(-ENOTCONN);
2210
ba7aa64f 2211 hlen = __ertm_hdr_size(chan);
e4ca6d98 2212
c74e560c 2213 if (sdulen)
03a51213 2214 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2215
47d1ec61 2216 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2217 hlen += L2CAP_FCS_SIZE;
fcc203c3 2218
1c2acffb 2219 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2220
d9fbd02b 2221 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2222 msg->msg_flags & MSG_DONTWAIT);
2223 if (IS_ERR(skb))
2224 return skb;
1c2acffb
GP		 2225
2226 /* Create L2CAP header */
2227 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2228 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2229 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2230
18a48e76
MM		 2231 /* Control header is populated later */
2232 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2233 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2234 else
2235 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2236
c74e560c 2237 if (sdulen)
03a51213 2238 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2239
0952a57a 2240 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2241 if (unlikely(err < 0)) {
2242 kfree_skb(skb);
2243 return ERR_PTR(err);
2244 }
e90bac06 2245
18a48e76 2246 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2247 bt_cb(skb)->control.retries = 0;
1c2acffb 2248 return skb;
1da177e4
LT		 2249}
2250
94122bbe
MM		 2251static int l2cap_segment_sdu(struct l2cap_chan *chan,
2252 struct sk_buff_head *seg_queue,
2253 struct msghdr *msg, size_t len)
c74e560c 2254{
c74e560c 2255 struct sk_buff *skb;
94122bbe
MM		 2256 u16 sdu_len;
2257 size_t pdu_len;
94122bbe 2258 u8 sar;
c74e560c 2259
b4400672 2260 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2261
94122bbe
MM		 2262 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2263 * so fragmented skbs are not used. The HCI layer's handling
2264 * of fragmented skbs is not compatible with ERTM's queueing.
2265 */
c74e560c 2266
94122bbe
MM		 2267 /* PDU size is derived from the HCI MTU */
2268 pdu_len = chan->conn->mtu;
c74e560c 2269
a549574d
MM		 2270 /* Constrain PDU size for BR/EDR connections */
2271 if (!chan->hs_hcon)
2272 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2273
2274 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2275 if (chan->fcs)
2276 pdu_len -= L2CAP_FCS_SIZE;
2277
ba7aa64f 2278 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2279
2280 /* Remote device may have requested smaller PDUs */
2281 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2282
2283 if (len <= pdu_len) {
2284 sar = L2CAP_SAR_UNSEGMENTED;
2285 sdu_len = 0;
2286 pdu_len = len;
2287 } else {
2288 sar = L2CAP_SAR_START;
2289 sdu_len = len;
94122bbe
MM		 2290 }
2291
2292 while (len > 0) {
2293 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2294
c74e560c 2295 if (IS_ERR(skb)) {
94122bbe 2296 __skb_queue_purge(seg_queue);
c74e560c
GP		 2297 return PTR_ERR(skb);
2298 }
2299
94122bbe
MM		 2300 bt_cb(skb)->control.sar = sar;
2301 __skb_queue_tail(seg_queue, skb);
2302
2303 len -= pdu_len;
069cb270 2304 if (sdu_len)
94122bbe 2305 sdu_len = 0;
94122bbe
MM		 2306
2307 if (len <= pdu_len) {
2308 sar = L2CAP_SAR_END;
2309 pdu_len = len;
2310 } else {
2311 sar = L2CAP_SAR_CONTINUE;
2312 }
c74e560c 2313 }
c74e560c 2314
f0f62799 2315 return 0;
c74e560c
GP		 2316}
2317
177f8f2b
JH		 2318static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2319 struct msghdr *msg,
2320 size_t len, u16 sdulen)
2321{
2322 struct l2cap_conn *conn = chan->conn;
2323 struct sk_buff *skb;
2324 int err, count, hlen;
2325 struct l2cap_hdr *lh;
2326
2327 BT_DBG("chan %p len %zu", chan, len);
2328
2329 if (!conn)
2330 return ERR_PTR(-ENOTCONN);
2331
2332 hlen = L2CAP_HDR_SIZE;
2333
2334 if (sdulen)
2335 hlen += L2CAP_SDULEN_SIZE;
2336
2337 count = min_t(unsigned int, (conn->mtu - hlen), len);
2338
d9fbd02b 2339 skb = chan->ops->alloc_skb(chan, hlen, count,
177f8f2b
JH		 2340 msg->msg_flags & MSG_DONTWAIT);
2341 if (IS_ERR(skb))
2342 return skb;
2343
2344 /* Create L2CAP header */
2345 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2346 lh->cid = cpu_to_le16(chan->dcid);
2347 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2348
2349 if (sdulen)
2350 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2351
2352 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2353 if (unlikely(err < 0)) {
2354 kfree_skb(skb);
2355 return ERR_PTR(err);
2356 }
2357
2358 return skb;
2359}
2360
2361static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2362 struct sk_buff_head *seg_queue,
2363 struct msghdr *msg, size_t len)
2364{
2365 struct sk_buff *skb;
2366 size_t pdu_len;
2367 u16 sdu_len;
2368
2369 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2370
177f8f2b 2371 sdu_len = len;
72c6fb91 2372 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
177f8f2b
JH		 2373
2374 while (len > 0) {
2375 if (len <= pdu_len)
2376 pdu_len = len;
2377
2378 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2379 if (IS_ERR(skb)) {
2380 __skb_queue_purge(seg_queue);
2381 return PTR_ERR(skb);
2382 }
2383
2384 __skb_queue_tail(seg_queue, skb);
2385
2386 len -= pdu_len;
2387
2388 if (sdu_len) {
2389 sdu_len = 0;
2390 pdu_len += L2CAP_SDULEN_SIZE;
2391 }
2392 }
2393
2394 return 0;
2395}
2396
8d46321c 2397int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
9a91a04a 2398{
9a91a04a 2399 struct sk_buff *skb;
9a91a04a 2400 int err;
94122bbe 2401 struct sk_buff_head seg_queue;
9a91a04a 2402
31e8ce80
SWK		 2403 if (!chan->conn)
2404 return -ENOTCONN;
2405
9a91a04a 2406 /* Connectionless channel */
715ec005 2407 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
8d46321c 2408 skb = l2cap_create_connless_pdu(chan, msg, len);
9a91a04a
GP		 2409 if (IS_ERR(skb))
2410 return PTR_ERR(skb);
2411
ede81a2a
AK		 2412 /* Channel lock is released before requesting new skb and then
2413 * reacquired thus we need to recheck channel state.
2414 */
2415 if (chan->state != BT_CONNECTED) {
2416 kfree_skb(skb);
2417 return -ENOTCONN;
2418 }
2419
9a91a04a
GP		 2420 l2cap_do_send(chan, skb);
2421 return len;
2422 }
2423
2424 switch (chan->mode) {
38319713 2425 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2426 /* Check outgoing MTU */
2427 if (len > chan->omtu)
2428 return -EMSGSIZE;
2429
fad5fc89
JH		 2430 if (!chan->tx_credits)
2431 return -EAGAIN;
2432
177f8f2b
JH		 2433 __skb_queue_head_init(&seg_queue);
2434
2435 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2436
2437 if (chan->state != BT_CONNECTED) {
2438 __skb_queue_purge(&seg_queue);
2439 err = -ENOTCONN;
2440 }
2441
2442 if (err)
2443 return err;
2444
2445 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2446
2447 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2448 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2449 chan->tx_credits--;
2450 }
2451
2452 if (!chan->tx_credits)
2453 chan->ops->suspend(chan);
2454
2455 err = len;
2456
2457 break;
2458
fad5fc89 2459 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2460 /* Check outgoing MTU */
2461 if (len > chan->omtu)
2462 return -EMSGSIZE;
2463
2464 /* Create a basic PDU */
8d46321c 2465 skb = l2cap_create_basic_pdu(chan, msg, len);
9a91a04a
GP		 2466 if (IS_ERR(skb))
2467 return PTR_ERR(skb);
2468
ede81a2a
AK		 2469 /* Channel lock is released before requesting new skb and then
2470 * reacquired thus we need to recheck channel state.
2471 */
2472 if (chan->state != BT_CONNECTED) {
2473 kfree_skb(skb);
2474 return -ENOTCONN;
2475 }
2476
9a91a04a
GP		 2477 l2cap_do_send(chan, skb);
2478 err = len;
2479 break;
2480
2481 case L2CAP_MODE_ERTM:
2482 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2483 /* Check outgoing MTU */
2484 if (len > chan->omtu) {
2485 err = -EMSGSIZE;
2486 break;
2487 }
9a91a04a 2488
94122bbe 2489 __skb_queue_head_init(&seg_queue);
9a91a04a 2490
94122bbe
MM		 2491 /* Do segmentation before calling in to the state machine,
2492 * since it's possible to block while waiting for memory
2493 * allocation.
2494 */
2495 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2496
94122bbe
MM		 2497 /* The channel could have been closed while segmenting,
2498 * check that it is still connected.
2499 */
2500 if (chan->state != BT_CONNECTED) {
2501 __skb_queue_purge(&seg_queue);
2502 err = -ENOTCONN;
9a91a04a
GP		 2503 }
2504
94122bbe 2505 if (err)
9a91a04a 2506 break;
9a91a04a 2507
3733937d 2508 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2509 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2510 else
d660366d 2511 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2512
d660366d 2513 err = len;
9a91a04a 2514
94122bbe
MM		 2515 /* If the skbs were not queued for sending, they'll still be in
2516 * seg_queue and need to be purged.
2517 */
2518 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2519 break;
2520
2521 default:
2522 BT_DBG("bad state %1.1x", chan->mode);
2523 err = -EBADFD;
2524 }
2525
2526 return err;
2527}
6b8d4a6a 2528EXPORT_SYMBOL_GPL(l2cap_chan_send);
9a91a04a 2529
d2a7ac5d
MM		 2530static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2531{
bed68bde
MM		 2532 struct l2cap_ctrl control;
2533 u16 seq;
2534
b4400672 2535 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2536
2537 memset(&control, 0, sizeof(control));
2538 control.sframe = 1;
2539 control.super = L2CAP_SUPER_SREJ;
2540
2541 for (seq = chan->expected_tx_seq; seq != txseq;
2542 seq = __next_seq(chan, seq)) {
2543 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2544 control.reqseq = seq;
2545 l2cap_send_sframe(chan, &control);
2546 l2cap_seq_list_append(&chan->srej_list, seq);
2547 }
2548 }
2549
2550 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2551}
2552
2553static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2554{
bed68bde
MM		 2555 struct l2cap_ctrl control;
2556
2557 BT_DBG("chan %p", chan);
2558
2559 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2560 return;
2561
2562 memset(&control, 0, sizeof(control));
2563 control.sframe = 1;
2564 control.super = L2CAP_SUPER_SREJ;
2565 control.reqseq = chan->srej_list.tail;
2566 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2567}
2568
2569static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2570{
bed68bde
MM		 2571 struct l2cap_ctrl control;
2572 u16 initial_head;
2573 u16 seq;
2574
b4400672 2575 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2576
2577 memset(&control, 0, sizeof(control));
2578 control.sframe = 1;
2579 control.super = L2CAP_SUPER_SREJ;
2580
2581 /* Capture initial list head to allow only one pass through the list. */
2582 initial_head = chan->srej_list.head;
2583
2584 do {
2585 seq = l2cap_seq_list_pop(&chan->srej_list);
2586 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2587 break;
2588
2589 control.reqseq = seq;
2590 l2cap_send_sframe(chan, &control);
2591 l2cap_seq_list_append(&chan->srej_list, seq);
2592 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2593}
2594
608bcc6d
MM		 2595static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2596{
2597 struct sk_buff *acked_skb;
2598 u16 ackseq;
2599
b4400672 2600 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2601
2602 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2603 return;
2604
b4400672 2605 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2606 chan->expected_ack_seq, chan->unacked_frames);
2607
2608 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2609 ackseq = __next_seq(chan, ackseq)) {
2610
2611 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2612 if (acked_skb) {
2613 skb_unlink(acked_skb, &chan->tx_q);
2614 kfree_skb(acked_skb);
2615 chan->unacked_frames--;
2616 }
2617 }
2618
2619 chan->expected_ack_seq = reqseq;
2620
2621 if (chan->unacked_frames == 0)
2622 __clear_retrans_timer(chan);
2623
b4400672 2624 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2625}
2626
2627static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2628{
2629 BT_DBG("chan %p", chan);
2630
2631 chan->expected_tx_seq = chan->buffer_seq;
2632 l2cap_seq_list_clear(&chan->srej_list);
2633 skb_queue_purge(&chan->srej_q);
2634 chan->rx_state = L2CAP_RX_STATE_RECV;
2635}
2636
d660366d
GP		 2637static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2638 struct l2cap_ctrl *control,
2639 struct sk_buff_head *skbs, u8 event)
608bcc6d 2640{
608bcc6d
MM		 2641 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2642 event);
2643
2644 switch (event) {
2645 case L2CAP_EV_DATA_REQUEST:
2646 if (chan->tx_send_head == NULL)
2647 chan->tx_send_head = skb_peek(skbs);
2648
2649 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2650 l2cap_ertm_send(chan);
2651 break;
2652 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2653 BT_DBG("Enter LOCAL_BUSY");
2654 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2655
2656 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2657 /* The SREJ_SENT state must be aborted if we are to
2658 * enter the LOCAL_BUSY state.
2659 */
2660 l2cap_abort_rx_srej_sent(chan);
2661 }
2662
2663 l2cap_send_ack(chan);
2664
2665 break;
2666 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2667 BT_DBG("Exit LOCAL_BUSY");
2668 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2669
2670 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2671 struct l2cap_ctrl local_control;
2672
2673 memset(&local_control, 0, sizeof(local_control));
2674 local_control.sframe = 1;
2675 local_control.super = L2CAP_SUPER_RR;
2676 local_control.poll = 1;
2677 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2678 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2679
2680 chan->retry_count = 1;
2681 __set_monitor_timer(chan);
2682 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2683 }
2684 break;
2685 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2686 l2cap_process_reqseq(chan, control->reqseq);
2687 break;
2688 case L2CAP_EV_EXPLICIT_POLL:
2689 l2cap_send_rr_or_rnr(chan, 1);
2690 chan->retry_count = 1;
2691 __set_monitor_timer(chan);
2692 __clear_ack_timer(chan);
2693 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2694 break;
2695 case L2CAP_EV_RETRANS_TO:
2696 l2cap_send_rr_or_rnr(chan, 1);
2697 chan->retry_count = 1;
2698 __set_monitor_timer(chan);
2699 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2700 break;
2701 case L2CAP_EV_RECV_FBIT:
2702 /* Nothing to process */
2703 break;
2704 default:
2705 break;
2706 }
608bcc6d
MM		 2707}
2708
d660366d
GP		 2709static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2710 struct l2cap_ctrl *control,
2711 struct sk_buff_head *skbs, u8 event)
608bcc6d 2712{
608bcc6d
MM		 2713 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2714 event);
2715
2716 switch (event) {
2717 case L2CAP_EV_DATA_REQUEST:
2718 if (chan->tx_send_head == NULL)
2719 chan->tx_send_head = skb_peek(skbs);
2720 /* Queue data, but don't send. */
2721 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2722 break;
2723 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2724 BT_DBG("Enter LOCAL_BUSY");
2725 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2726
2727 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2728 /* The SREJ_SENT state must be aborted if we are to
2729 * enter the LOCAL_BUSY state.
2730 */
2731 l2cap_abort_rx_srej_sent(chan);
2732 }
2733
2734 l2cap_send_ack(chan);
2735
2736 break;
2737 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2738 BT_DBG("Exit LOCAL_BUSY");
2739 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2740
2741 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2742 struct l2cap_ctrl local_control;
2743 memset(&local_control, 0, sizeof(local_control));
2744 local_control.sframe = 1;
2745 local_control.super = L2CAP_SUPER_RR;
2746 local_control.poll = 1;
2747 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2748 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2749
2750 chan->retry_count = 1;
2751 __set_monitor_timer(chan);
2752 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2753 }
2754 break;
2755 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2756 l2cap_process_reqseq(chan, control->reqseq);
2757
2758 /* Fall through */
2759
2760 case L2CAP_EV_RECV_FBIT:
2761 if (control && control->final) {
2762 __clear_monitor_timer(chan);
2763 if (chan->unacked_frames > 0)
2764 __set_retrans_timer(chan);
2765 chan->retry_count = 0;
2766 chan->tx_state = L2CAP_TX_STATE_XMIT;
2767 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2768 }
2769 break;
2770 case L2CAP_EV_EXPLICIT_POLL:
2771 /* Ignore */
2772 break;
2773 case L2CAP_EV_MONITOR_TO:
2774 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2775 l2cap_send_rr_or_rnr(chan, 1);
2776 __set_monitor_timer(chan);
2777 chan->retry_count++;
2778 } else {
5e4e3972 2779 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2780 }
2781 break;
2782 default:
2783 break;
2784 }
608bcc6d
MM		 2785}
2786
d660366d
GP		 2787static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2788 struct sk_buff_head *skbs, u8 event)
608bcc6d 2789{
608bcc6d
MM		 2790 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2791 chan, control, skbs, event, chan->tx_state);
2792
2793 switch (chan->tx_state) {
2794 case L2CAP_TX_STATE_XMIT:
d660366d 2795 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2796 break;
2797 case L2CAP_TX_STATE_WAIT_F:
d660366d 2798 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2799 break;
2800 default:
2801 /* Ignore event */
2802 break;
2803 }
608bcc6d
MM		 2804}
2805
4b51dae9
MM		 2806static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2807 struct l2cap_ctrl *control)
2808{
2809 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2810 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2811}
2812
f80842a8
MM		 2813static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2814 struct l2cap_ctrl *control)
2815{
2816 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2817 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2818}
2819
1da177e4
LT		 2820/* Copy frame to all raw sockets on that connection */
2821static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2822{
1da177e4 2823 struct sk_buff *nskb;
48454079 2824 struct l2cap_chan *chan;
1da177e4
LT		 2825
2826 BT_DBG("conn %p", conn);
2827
3df91ea2 2828 mutex_lock(&conn->chan_lock);
3d57dc68 2829
3df91ea2 2830 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2831 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2832 continue;
2833
7f5396a7
GP		 2834 /* Don't send frame to the channel it came from */
2835 if (bt_cb(skb)->chan == chan)
1da177e4 2836 continue;
7f5396a7 2837
8bcde1f2 2838 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2839 if (!nskb)
1da177e4 2840 continue;
80b98027 2841 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2842 kfree_skb(nskb);
2843 }
3d57dc68 2844
3df91ea2 2845 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2846}
2847
2848/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2849static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2850 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2851{
2852 struct sk_buff *skb, **frag;
2853 struct l2cap_cmd_hdr *cmd;
2854 struct l2cap_hdr *lh;
2855 int len, count;
2856
b4400672
AE		 2857 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2858 conn, code, ident, dlen);
1da177e4 2859
300b962e
AL		 2860 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2861 return NULL;
2862
1da177e4
LT		 2863 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2864 count = min_t(unsigned int, conn->mtu, len);
2865
8bcde1f2 2866 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2867 if (!skb)
2868 return NULL;
2869
2870 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2871 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2872
2873 if (conn->hcon->type == LE_LINK)
dcf4adbf 2874 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2875 else
dcf4adbf 2876 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2877
2878 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2879 cmd->code = code;
2880 cmd->ident = ident;
aca3192c 2881 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2882
2883 if (dlen) {
2884 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2885 memcpy(skb_put(skb, count), data, count);
2886 data += count;
2887 }
2888
2889 len -= skb->len;
2890
2891 /* Continuation fragments (no L2CAP header) */
2892 frag = &skb_shinfo(skb)->frag_list;
2893 while (len) {
2894 count = min_t(unsigned int, conn->mtu, len);
2895
8bcde1f2 2896 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2897 if (!*frag)
2898 goto fail;
2899
2900 memcpy(skb_put(*frag, count), data, count);
2901
2902 len -= count;
2903 data += count;
2904
2905 frag = &(*frag)->next;
2906 }
2907
2908 return skb;
2909
2910fail:
2911 kfree_skb(skb);
2912 return NULL;
2913}
2914
2d792818
GP		 2915static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2916 unsigned long *val)
1da177e4
LT		 2917{
2918 struct l2cap_conf_opt *opt = *ptr;
2919 int len;
2920
2921 len = L2CAP_CONF_OPT_SIZE + opt->len;
2922 *ptr += len;
2923
2924 *type = opt->type;
2925 *olen = opt->len;
2926
2927 switch (opt->len) {
2928 case 1:
2929 *val = *((u8 *) opt->val);
2930 break;
2931
2932 case 2:
bfaaeb3e 2933 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2934 break;
2935
2936 case 4:
bfaaeb3e 2937 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2938 break;
2939
2940 default:
2941 *val = (unsigned long) opt->val;
2942 break;
2943 }
2944
b4400672 2945 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2946 return len;
2947}
2948
1da177e4
LT		 2949static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2950{
2951 struct l2cap_conf_opt *opt = *ptr;
2952
b4400672 2953 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2954
2955 opt->type = type;
2956 opt->len = len;
2957
2958 switch (len) {
2959 case 1:
2960 *((u8 *) opt->val) = val;
2961 break;
2962
2963 case 2:
4f8b691c 2964 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2965 break;
2966
2967 case 4:
4f8b691c 2968 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2969 break;
2970
2971 default:
2972 memcpy(opt->val, (void *) val, len);
2973 break;
2974 }
2975
2976 *ptr += L2CAP_CONF_OPT_SIZE + len;
2977}
2978
f89cef09
AE		 2979static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2980{
2981 struct l2cap_conf_efs efs;
2982
1ec918ce 2983 switch (chan->mode) {
f89cef09
AE		 2984 case L2CAP_MODE_ERTM:
2985 efs.id = chan->local_id;
2986 efs.stype = chan->local_stype;
2987 efs.msdu = cpu_to_le16(chan->local_msdu);
2988 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
dcf4adbf
JP		 2989 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2990 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 2991 break;
2992
2993 case L2CAP_MODE_STREAMING:
2994 efs.id = 1;
2995 efs.stype = L2CAP_SERV_BESTEFFORT;
2996 efs.msdu = cpu_to_le16(chan->local_msdu);
2997 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2998 efs.acc_lat = 0;
2999 efs.flush_to = 0;
3000 break;
3001
3002 default:
3003 return;
3004 }
3005
3006 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3007 (unsigned long) &efs);
f89cef09
AE		 3008}
3009
721c4181 3010static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3011{
721c4181 3012 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3013 ack_timer.work);
3014 u16 frames_to_ack;
c1b4f43b 3015
2fb9b3d4
GP		 3016 BT_DBG("chan %p", chan);
3017
6be36555
AE		 3018 l2cap_chan_lock(chan);
3019
0362520b
MM		 3020 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3021 chan->last_acked_seq);
6be36555 3022
0362520b
MM		 3023 if (frames_to_ack)
3024 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3025
0362520b 3026 l2cap_chan_unlock(chan);
09bfb2ee 3027 l2cap_chan_put(chan);
c1b4f43b
GP		 3028}
3029
466f8004 3030int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3031{
3c588192
MM		 3032 int err;
3033
105bdf9e
MM		 3034 chan->next_tx_seq = 0;
3035 chan->expected_tx_seq = 0;
42e5c802 3036 chan->expected_ack_seq = 0;
6a026610 3037 chan->unacked_frames = 0;
42e5c802 3038 chan->buffer_seq = 0;
6a026610 3039 chan->frames_sent = 0;
105bdf9e
MM		 3040 chan->last_acked_seq = 0;
3041 chan->sdu = NULL;
3042 chan->sdu_last_frag = NULL;
3043 chan->sdu_len = 0;
3044
d34c34fb
MM		 3045 skb_queue_head_init(&chan->tx_q);
3046
6ed971ca
MH		 3047 chan->local_amp_id = AMP_ID_BREDR;
3048 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3049 chan->move_state = L2CAP_MOVE_STABLE;
3050 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3051
105bdf9e
MM		 3052 if (chan->mode != L2CAP_MODE_ERTM)
3053 return 0;
3054
3055 chan->rx_state = L2CAP_RX_STATE_RECV;
3056 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3057
721c4181
GP		 3058 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3059 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3060 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3061
f1c6775b 3062 skb_queue_head_init(&chan->srej_q);
1890d36b 3063
3c588192
MM		 3064 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3065 if (err < 0)
3066 return err;
3067
9dc9affc
MM		 3068 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3069 if (err < 0)
3070 l2cap_seq_list_free(&chan->srej_list);
3071
3072 return err;
0565c1c2
GP		 3073}
3074
f2fcfcd6
GP		 3075static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3076{
3077 switch (mode) {
3078 case L2CAP_MODE_STREAMING:
3079 case L2CAP_MODE_ERTM:
3080 if (l2cap_mode_supported(mode, remote_feat_mask))
3081 return mode;
3082 /* fall through */
3083 default:
3084 return L2CAP_MODE_BASIC;
3085 }
3086}
3087
848566b3 3088static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3089{
848566b3 3090 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
6327eb98
AE		 3091}
3092
848566b3 3093static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3094{
848566b3 3095 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
f89cef09
AE		 3096}
3097
36c86c85
MM		 3098static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3099 struct l2cap_conf_rfc *rfc)
3100{
6ed971ca 3101 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3102 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3103
3104 /* Class 1 devices have must have ERTM timeouts
3105 * exceeding the Link Supervision Timeout. The
3106 * default Link Supervision Timeout for AMP
3107 * controllers is 10 seconds.
3108 *
3109 * Class 1 devices use 0xffffffff for their
3110 * best-effort flush timeout, so the clamping logic
3111 * will result in a timeout that meets the above
3112 * requirement. ERTM timeouts are 16-bit values, so
3113 * the maximum timeout is 65.535 seconds.
3114 */
3115
3116 /* Convert timeout to milliseconds and round */
3117 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3118
3119 /* This is the recommended formula for class 2 devices
3120 * that start ERTM timers when packets are sent to the
3121 * controller.
3122 */
3123 ertm_to = 3 * ertm_to + 500;
3124
3125 if (ertm_to > 0xffff)
3126 ertm_to = 0xffff;
3127
3128 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3129 rfc->monitor_timeout = rfc->retrans_timeout;
3130 } else {
dcf4adbf
JP		 3131 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3132 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
36c86c85
MM		 3133 }
3134}
3135
6327eb98
AE		 3136static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3137{
3138 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3139 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3140 /* use extended control field */
3141 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3142 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3143 } else {
6327eb98 3144 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3145 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3146 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3147 }
c20f8e35 3148 chan->ack_win = chan->tx_win;
6327eb98
AE		 3149}
3150
710f9b0a 3151static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3152{
1da177e4 3153 struct l2cap_conf_req *req = data;
0c1bc5c6 3154 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3155 void *ptr = req->data;
c8f79162 3156 u16 size;
1da177e4 3157
49208c9c 3158 BT_DBG("chan %p", chan);
1da177e4 3159
73ffa904 3160 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3161 goto done;
3162
0c1bc5c6 3163 switch (chan->mode) {
f2fcfcd6
GP		 3164 case L2CAP_MODE_STREAMING:
3165 case L2CAP_MODE_ERTM:
c1360a1c 3166 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3167 break;
85eb53c6 3168
848566b3 3169 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3170 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3171
2ba13ed6 3172 /* fall through */
f2fcfcd6 3173 default:
8c1d787b 3174 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3175 break;
3176 }
3177
3178done:
0c1bc5c6
GP		 3179 if (chan->imtu != L2CAP_DEFAULT_MTU)
3180 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3181
0c1bc5c6 3182 switch (chan->mode) {
65c7c491 3183 case L2CAP_MODE_BASIC:
6fea7ad1
MH		 3184 if (disable_ertm)
3185 break;
3186
8c1d787b 3187 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3188 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3189 break;
3190
62547752
GP		 3191 rfc.mode = L2CAP_MODE_BASIC;
3192 rfc.txwin_size = 0;
3193 rfc.max_transmit = 0;
3194 rfc.retrans_timeout = 0;
3195 rfc.monitor_timeout = 0;
3196 rfc.max_pdu_size = 0;
3197
63406504 3198 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3199 (unsigned long) &rfc);
65c7c491
MH		 3200 break;
3201
3202 case L2CAP_MODE_ERTM:
3203 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3204 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3205
3206 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3207
3208 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3209 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3210 L2CAP_FCS_SIZE);
c8f79162 3211 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3212
6327eb98
AE		 3213 l2cap_txwin_setup(chan);
3214
3215 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3216 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3217
63406504 3218 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3219 (unsigned long) &rfc);
63406504 3220
f89cef09
AE		 3221 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3222 l2cap_add_opt_efs(&ptr, chan);
3223
6327eb98
AE		 3224 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3225 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3226 chan->tx_win);
60918918
AE		 3227
3228 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3229 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3230 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3231 chan->fcs = L2CAP_FCS_NONE;
3232 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3233 chan->fcs);
3234 }
f2fcfcd6
GP		 3235 break;
3236
3237 case L2CAP_MODE_STREAMING:
273759e2 3238 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3239 rfc.mode = L2CAP_MODE_STREAMING;
3240 rfc.txwin_size = 0;
3241 rfc.max_transmit = 0;
3242 rfc.retrans_timeout = 0;
3243 rfc.monitor_timeout = 0;
c8f79162
AE		 3244
3245 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3246 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3247 L2CAP_FCS_SIZE);
c8f79162 3248 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3249
63406504 3250 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3251 (unsigned long) &rfc);
63406504 3252
f89cef09
AE		 3253 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3254 l2cap_add_opt_efs(&ptr, chan);
3255
60918918
AE		 3256 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3257 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3258 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3259 chan->fcs = L2CAP_FCS_NONE;
3260 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3261 chan->fcs);
3262 }
65c7c491
MH		 3263 break;
3264 }
1da177e4 3265
fe4128e0 3266 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3267 req->flags = cpu_to_le16(0);
1da177e4
LT		 3268
3269 return ptr - data;
3270}
3271
73ffa904 3272static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3273{
5dee9e7c
MH		 3274 struct l2cap_conf_rsp *rsp = data;
3275 void *ptr = rsp->data;
73ffa904
GP		 3276 void *req = chan->conf_req;
3277 int len = chan->conf_len;
5dee9e7c
MH		 3278 int type, hint, olen;
3279 unsigned long val;
6464f35f 3280 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3281 struct l2cap_conf_efs efs;
3282 u8 remote_efs = 0;
861d6882 3283 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3284 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3285 u16 size;
1da177e4 3286
73ffa904 3287 BT_DBG("chan %p", chan);
820ae1b8 3288
5dee9e7c
MH		 3289 while (len >= L2CAP_CONF_OPT_SIZE) {
3290 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3291
589d2746 3292 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3293 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3294
3295 switch (type) {
3296 case L2CAP_CONF_MTU:
861d6882 3297 mtu = val;
5dee9e7c
MH		 3298 break;
3299
3300 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3301 chan->flush_to = val;
5dee9e7c
MH		 3302 break;
3303
3304 case L2CAP_CONF_QOS:
3305 break;
3306
6464f35f
MH		 3307 case L2CAP_CONF_RFC:
3308 if (olen == sizeof(rfc))
3309 memcpy(&rfc, (void *) val, olen);
3310 break;
3311
fcc203c3
GP		 3312 case L2CAP_CONF_FCS:
3313 if (val == L2CAP_FCS_NONE)
f2592d3e 3314 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3315 break;
fcc203c3 3316
42dceae2
AE		 3317 case L2CAP_CONF_EFS:
3318 remote_efs = 1;
3319 if (olen == sizeof(efs))
3320 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3321 break;
3322
6327eb98 3323 case L2CAP_CONF_EWS:
848566b3 3324 if (!chan->conn->hs_enabled)
6327eb98 3325 return -ECONNREFUSED;
fcc203c3 3326
6327eb98
AE		 3327 set_bit(FLAG_EXT_CTRL, &chan->flags);
3328 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3329 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3330 chan->remote_tx_win = val;
fcc203c3
GP		 3331 break;
3332
5dee9e7c
MH		 3333 default:
3334 if (hint)
3335 break;
3336
3337 result = L2CAP_CONF_UNKNOWN;
3338 *((u8 *) ptr++) = type;
3339 break;
3340 }
3341 }
3342
73ffa904 3343 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3344 goto done;
3345
0c1bc5c6 3346 switch (chan->mode) {
f2fcfcd6
GP		 3347 case L2CAP_MODE_STREAMING:
3348 case L2CAP_MODE_ERTM:
c1360a1c 3349 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3350 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3351 chan->conn->feat_mask);
85eb53c6
GP		 3352 break;
3353 }
3354
42dceae2 3355 if (remote_efs) {
848566b3 3356 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3357 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3358 else
3359 return -ECONNREFUSED;
3360 }
3361
0c1bc5c6 3362 if (chan->mode != rfc.mode)
f2fcfcd6 3363 return -ECONNREFUSED;
742e519b 3364
f2fcfcd6 3365 break;
f2fcfcd6
GP		 3366 }
3367
3368done:
0c1bc5c6 3369 if (chan->mode != rfc.mode) {
f2fcfcd6 3370 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3371 rfc.mode = chan->mode;
f2fcfcd6 3372
73ffa904 3373 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3374 return -ECONNREFUSED;
3375
2d792818
GP		 3376 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3377 (unsigned long) &rfc);
f2fcfcd6
GP		 3378 }
3379
5dee9e7c
MH		 3380 if (result == L2CAP_CONF_SUCCESS) {
3381 /* Configure output options and let the other side know
3382 * which ones we don't like. */
3383
f2fcfcd6
GP		 3384 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3385 result = L2CAP_CONF_UNACCEPT;
3386 else {
0c1bc5c6 3387 chan->omtu = mtu;
c1360a1c 3388 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3389 }
0c1bc5c6 3390 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3391
42dceae2
AE		 3392 if (remote_efs) {
3393 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3394 efs.stype != L2CAP_SERV_NOTRAFIC &&
3395 efs.stype != chan->local_stype) {
42dceae2
AE		 3396
3397 result = L2CAP_CONF_UNACCEPT;
3398
3399 if (chan->num_conf_req >= 1)
3400 return -ECONNREFUSED;
3401
3402 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3403 sizeof(efs),
3404 (unsigned long) &efs);
0e8b207e 3405 } else {
3e6b3b95 3406 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3407 result = L2CAP_CONF_PENDING;
3408 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3409 }
3410 }
3411
f2fcfcd6
GP		 3412 switch (rfc.mode) {
3413 case L2CAP_MODE_BASIC:
47d1ec61 3414 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3415 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3416 break;
3417
3418 case L2CAP_MODE_ERTM:
6327eb98
AE		 3419 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3420 chan->remote_tx_win = rfc.txwin_size;
3421 else
3422 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3423
2c03a7a4 3424 chan->remote_max_tx = rfc.max_transmit;
1c762159 3425
c8f79162 3426 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3427 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3428 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3429 rfc.max_pdu_size = cpu_to_le16(size);
3430 chan->remote_mps = size;
f2fcfcd6 3431
36c86c85 3432 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3433
c1360a1c 3434 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3435
3436 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3437 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3438
42dceae2
AE		 3439 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3440 chan->remote_id = efs.id;
3441 chan->remote_stype = efs.stype;
3442 chan->remote_msdu = le16_to_cpu(efs.msdu);
3443 chan->remote_flush_to =
2d792818 3444 le32_to_cpu(efs.flush_to);
42dceae2 3445 chan->remote_acc_lat =
2d792818 3446 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3447 chan->remote_sdu_itime =
3448 le32_to_cpu(efs.sdu_itime);
3449 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3450 sizeof(efs),
3451 (unsigned long) &efs);
42dceae2 3452 }
f2fcfcd6
GP		 3453 break;
3454
3455 case L2CAP_MODE_STREAMING:
c8f79162 3456 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3457 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3458 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3459 rfc.max_pdu_size = cpu_to_le16(size);
3460 chan->remote_mps = size;
f2fcfcd6 3461
c1360a1c 3462 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3463
2d792818
GP		 3464 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3465 (unsigned long) &rfc);
68ae6639 3466
f2fcfcd6
GP		 3467 break;
3468
3469 default:
5dee9e7c 3470 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3471
6464f35f 3472 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3473 rfc.mode = chan->mode;
f2fcfcd6 3474 }
6464f35f 3475
f2fcfcd6 3476 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3477 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3478 }
fe4128e0 3479 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3480 rsp->result = cpu_to_le16(result);
dcf4adbf 3481 rsp->flags = cpu_to_le16(0);
5dee9e7c
MH		 3482
3483 return ptr - data;
1da177e4
LT		 3484}
3485
2d792818
GP		 3486static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3487 void *data, u16 *result)
f2fcfcd6 3488{
f2fcfcd6
GP		 3489 struct l2cap_conf_req *req = data;
3490 void *ptr = req->data;
3491 int type, olen;
3492 unsigned long val;
36e999a8 3493 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3494 struct l2cap_conf_efs efs;
f2fcfcd6 3495
fe4128e0 3496 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3497
3498 while (len >= L2CAP_CONF_OPT_SIZE) {
3499 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3500
3501 switch (type) {
3502 case L2CAP_CONF_MTU:
3503 if (val < L2CAP_DEFAULT_MIN_MTU) {
3504 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3505 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3506 } else
0c1bc5c6
GP		 3507 chan->imtu = val;
3508 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3509 break;
3510
3511 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3512 chan->flush_to = val;
f2fcfcd6 3513 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3514 2, chan->flush_to);
f2fcfcd6
GP		 3515 break;
3516
3517 case L2CAP_CONF_RFC:
3518 if (olen == sizeof(rfc))
3519 memcpy(&rfc, (void *)val, olen);
3520
c1360a1c 3521 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3522 rfc.mode != chan->mode)
f2fcfcd6
GP		 3523 return -ECONNREFUSED;
3524
47d1ec61 3525 chan->fcs = 0;
f2fcfcd6
GP		 3526
3527 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3528 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3529 break;
6327eb98
AE		 3530
3531 case L2CAP_CONF_EWS:
c20f8e35 3532 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3533 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3534 chan->tx_win);
6327eb98 3535 break;
66af7aaf
AE		 3536
3537 case L2CAP_CONF_EFS:
3538 if (olen == sizeof(efs))
3539 memcpy(&efs, (void *)val, olen);
3540
3541 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3542 efs.stype != L2CAP_SERV_NOTRAFIC &&
3543 efs.stype != chan->local_stype)
66af7aaf
AE		 3544 return -ECONNREFUSED;
3545
2d792818
GP		 3546 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3547 (unsigned long) &efs);
66af7aaf 3548 break;
cbabee78
AE		 3549
3550 case L2CAP_CONF_FCS:
3551 if (*result == L2CAP_CONF_PENDING)
3552 if (val == L2CAP_FCS_NONE)
f2592d3e 3553 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3554 &chan->conf_state);
3555 break;
f2fcfcd6
GP		 3556 }
3557 }
3558
0c1bc5c6 3559 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3560 return -ECONNREFUSED;
3561
0c1bc5c6 3562 chan->mode = rfc.mode;
6c2ea7a8 3563
0e8b207e 3564 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3565 switch (rfc.mode) {
3566 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3567 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3568 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3569 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3570 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3571 chan->ack_win = min_t(u16, chan->ack_win,
3572 rfc.txwin_size);
66af7aaf
AE		 3573
3574 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3575 chan->local_msdu = le16_to_cpu(efs.msdu);
3576 chan->local_sdu_itime =
2d792818 3577 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3578 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3579 chan->local_flush_to =
2d792818 3580 le32_to_cpu(efs.flush_to);
66af7aaf 3581 }
f2fcfcd6 3582 break;
66af7aaf 3583
f2fcfcd6 3584 case L2CAP_MODE_STREAMING:
47d1ec61 3585 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3586 }
3587 }
3588
fe4128e0 3589 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3590 req->flags = cpu_to_le16(0);
f2fcfcd6
GP		 3591
3592 return ptr - data;
3593}
3594
2d792818
GP		 3595static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3596 u16 result, u16 flags)
1da177e4
LT		 3597{
3598 struct l2cap_conf_rsp *rsp = data;
3599 void *ptr = rsp->data;
1da177e4 3600
fe4128e0 3601 BT_DBG("chan %p", chan);
1da177e4 3602
fe4128e0 3603 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3604 rsp->result = cpu_to_le16(result);
aca3192c 3605 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3606
3607 return ptr - data;
3608}
3609
27e2d4c8
JH		 3610void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3611{
3612 struct l2cap_le_conn_rsp rsp;
3613 struct l2cap_conn *conn = chan->conn;
3614
3615 BT_DBG("chan %p", chan);
3616
3617 rsp.dcid = cpu_to_le16(chan->scid);
3618 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3619 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3620 rsp.credits = cpu_to_le16(chan->rx_credits);
dcf4adbf 3621 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
27e2d4c8
JH		 3622
3623 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3624 &rsp);
3625}
3626
8c1d787b 3627void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3628{
3629 struct l2cap_conn_rsp rsp;
8c1d787b 3630 struct l2cap_conn *conn = chan->conn;
710f9b0a 3631 u8 buf[128];
439f34ac 3632 u8 rsp_code;
710f9b0a 3633
fe4128e0
GP		 3634 rsp.scid = cpu_to_le16(chan->dcid);
3635 rsp.dcid = cpu_to_le16(chan->scid);
dcf4adbf
JP		 3636 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3637 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3638
3639 if (chan->hs_hcon)
3640 rsp_code = L2CAP_CREATE_CHAN_RSP;
3641 else
3642 rsp_code = L2CAP_CONN_RSP;
3643
3644 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3645
3646 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3647
c1360a1c 3648 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3649 return;
3650
710f9b0a 3651 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3652 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3653 chan->num_conf_req++;
3654}
3655
47d1ec61 3656static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3657{
7b1c0049
GP		 3658 int type, olen;
3659 unsigned long val;
c20f8e35
MM		 3660 /* Use sane default values in case a misbehaving remote device
3661 * did not send an RFC or extended window size option.
3662 */
3663 u16 txwin_ext = chan->ack_win;
3664 struct l2cap_conf_rfc rfc = {
3665 .mode = chan->mode,
dcf4adbf
JP		 3666 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3667 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
c20f8e35
MM		 3668 .max_pdu_size = cpu_to_le16(chan->imtu),
3669 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3670 };
7b1c0049 3671
47d1ec61 3672 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3673
0c1bc5c6 3674 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3675 return;
3676
3677 while (len >= L2CAP_CONF_OPT_SIZE) {
3678 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3679
c20f8e35
MM		 3680 switch (type) {
3681 case L2CAP_CONF_RFC:
3682 if (olen == sizeof(rfc))
3683 memcpy(&rfc, (void *)val, olen);
8f321f85 3684 break;
c20f8e35
MM		 3685 case L2CAP_CONF_EWS:
3686 txwin_ext = val;
3687 break;
3688 }
7b1c0049
GP		 3689 }
3690
7b1c0049
GP		 3691 switch (rfc.mode) {
3692 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3693 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3694 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3695 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3696 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3697 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3698 else
3699 chan->ack_win = min_t(u16, chan->ack_win,
3700 rfc.txwin_size);
7b1c0049
GP		 3701 break;
3702 case L2CAP_MODE_STREAMING:
47d1ec61 3703 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3704 }
3705}
3706
2d792818 3707static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3708 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3709 u8 *data)
4e8402a3 3710{
e2fd318e 3711 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3712
cb3b3152
JH		 3713 if (cmd_len < sizeof(*rej))
3714 return -EPROTO;
3715
e2fd318e 3716 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3717 return 0;
3718
3719 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3720 cmd->ident == conn->info_ident) {
17cd3f37 3721 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3722
3723 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3724 conn->info_ident = 0;
984947dc 3725
4e8402a3
MH		 3726 l2cap_conn_start(conn);
3727 }
3728
3729 return 0;
3730}
3731
1700915f
MM		 3732static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3733 struct l2cap_cmd_hdr *cmd,
3734 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3735{
1da177e4
LT		 3736 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3737 struct l2cap_conn_rsp rsp;
23691d75 3738 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3739 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3740
3741 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3742 __le16 psm = req->psm;
1da177e4 3743
097db76c 3744 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3745
3746 /* Check if we have socket listening on psm */
6f59b904 3747 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3748 &conn->hcon->dst, ACL_LINK);
23691d75 3749 if (!pchan) {
1da177e4
LT		 3750 result = L2CAP_CR_BAD_PSM;
3751 goto sendresp;
3752 }
3753
3df91ea2 3754 mutex_lock(&conn->chan_lock);
8ffb9290 3755 l2cap_chan_lock(pchan);
e0f0cb56 3756
e7c29cb1 3757 /* Check if the ACL is secure enough (if not SDP) */
dcf4adbf 3758 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3759 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3760 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3761 result = L2CAP_CR_SEC_BLOCK;
3762 goto response;
3763 }
3764
1da177e4
LT		 3765 result = L2CAP_CR_NO_MEM;
3766
2dfa1003
GP		 3767 /* Check if we already have channel with that dcid */
3768 if (__l2cap_get_chan_by_dcid(conn, scid))
3769 goto response;
3770
80b98027 3771 chan = pchan->ops->new_connection(pchan);
80808e43 3772 if (!chan)
1da177e4
LT		 3773 goto response;
3774
330b6c15
SS		 3775 /* For certain devices (ex: HID mouse), support for authentication,
3776 * pairing and bonding is optional. For such devices, inorder to avoid
3777 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3778 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3779 */
3780 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3781
7eafc59e
MH		 3782 bacpy(&chan->src, &conn->hcon->src);
3783 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 3784 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3785 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
fe4128e0
GP		 3786 chan->psm = psm;
3787 chan->dcid = scid;
1700915f 3788 chan->local_amp_id = amp_id;
1da177e4 3789
6be36555 3790 __l2cap_chan_add(conn, chan);
48454079 3791
fe4128e0 3792 dcid = chan->scid;
1da177e4 3793
8d836d71 3794 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3795
fc7f8a7e 3796 chan->ident = cmd->ident;
1da177e4 3797
984947dc 3798 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
e7cafc45 3799 if (l2cap_chan_check_security(chan, false)) {
bdc25783 3800 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3801 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3802 result = L2CAP_CR_PEND;
3803 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3804 chan->ops->defer(chan);
f66dc81f 3805 } else {
1700915f
MM		 3806 /* Force pending result for AMP controllers.
3807 * The connection will succeed after the
3808 * physical link is up.
3809 */
6ed971ca 3810 if (amp_id == AMP_ID_BREDR) {
f93fa273 3811 l2cap_state_change(chan, BT_CONFIG);
1700915f 3812 result = L2CAP_CR_SUCCESS;
6ed971ca 3813 } else {
f93fa273 3814 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3815 result = L2CAP_CR_PEND;
1700915f 3816 }
f66dc81f
MH		 3817 status = L2CAP_CS_NO_INFO;
3818 }
79d554a6 3819 } else {
f93fa273 3820 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3821 result = L2CAP_CR_PEND;
3822 status = L2CAP_CS_AUTHEN_PEND;
3823 }
3824 } else {
f93fa273 3825 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3826 result = L2CAP_CR_PEND;
3827 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3828 }
3829
1da177e4 3830response:
8ffb9290 3831 l2cap_chan_unlock(pchan);
3df91ea2 3832 mutex_unlock(&conn->chan_lock);
a24cce14 3833 l2cap_chan_put(pchan);
1da177e4
LT		 3834
3835sendresp:
aca3192c
YH		 3836 rsp.scid = cpu_to_le16(scid);
3837 rsp.dcid = cpu_to_le16(dcid);
3838 rsp.result = cpu_to_le16(result);
3839 rsp.status = cpu_to_le16(status);
4c89b6aa 3840 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3841
3842 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3843 struct l2cap_info_req info;
dcf4adbf 3844 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3845
3846 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3847 conn->info_ident = l2cap_get_ident(conn);
3848
ba13ccd9 3849 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3850
2d792818
GP		 3851 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3852 sizeof(info), &info);
79d554a6
MH		 3853 }
3854
c1360a1c 3855 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3856 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3857 u8 buf[128];
c1360a1c 3858 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3859 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3860 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3861 chan->num_conf_req++;
e9aeb2dd 3862 }
1700915f
MM		 3863
3864 return chan;
4c89b6aa 3865}
e9aeb2dd 3866
4c89b6aa 3867static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3868 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3869{
7b064eda
JK		 3870 struct hci_dev *hdev = conn->hcon->hdev;
3871 struct hci_conn *hcon = conn->hcon;
3872
cb3b3152
JH		 3873 if (cmd_len < sizeof(struct l2cap_conn_req))
3874 return -EPROTO;
3875
7b064eda
JK		 3876 hci_dev_lock(hdev);
3877 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3878 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
48ec92fa 3879 mgmt_device_connected(hdev, hcon, 0, NULL, 0);
7b064eda
JK		 3880 hci_dev_unlock(hdev);
3881
300229f9 3882 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3883 return 0;
3884}
3885
5909cf30 3886static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3887 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3888 u8 *data)
1da177e4
LT		 3889{
3890 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3891 u16 scid, dcid, result, status;
48454079 3892 struct l2cap_chan *chan;
1da177e4 3893 u8 req[128];
3df91ea2 3894 int err;
1da177e4 3895
cb3b3152
JH		 3896 if (cmd_len < sizeof(*rsp))
3897 return -EPROTO;
3898
1da177e4
LT		 3899 scid = __le16_to_cpu(rsp->scid);
3900 dcid = __le16_to_cpu(rsp->dcid);
3901 result = __le16_to_cpu(rsp->result);
3902 status = __le16_to_cpu(rsp->status);
3903
1b009c98 3904 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3905 dcid, scid, result, status);
1da177e4 3906
3df91ea2
AE		 3907 mutex_lock(&conn->chan_lock);
3908
1da177e4 3909 if (scid) {
3df91ea2
AE		 3910 chan = __l2cap_get_chan_by_scid(conn, scid);
3911 if (!chan) {
21870b52 3912 err = -EBADSLT;
3df91ea2
AE		 3913 goto unlock;
3914 }
1da177e4 3915 } else {
3df91ea2
AE		 3916 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3917 if (!chan) {
21870b52 3918 err = -EBADSLT;
3df91ea2
AE		 3919 goto unlock;
3920 }
1da177e4
LT		 3921 }
3922
3df91ea2
AE		 3923 err = 0;
3924
6be36555 3925 l2cap_chan_lock(chan);
48454079 3926
1da177e4
LT		 3927 switch (result) {
3928 case L2CAP_CR_SUCCESS:
89bc500e 3929 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3930 chan->ident = 0;
fe4128e0 3931 chan->dcid = dcid;
c1360a1c 3932 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3933
c1360a1c 3934 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3935 break;
3936
1da177e4 3937 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3938 l2cap_build_conf_req(chan, req), req);
73ffa904 3939 chan->num_conf_req++;
1da177e4
LT		 3940 break;
3941
3942 case L2CAP_CR_PEND:
c1360a1c 3943 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3944 break;
3945
3946 default:
48454079 3947 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3948 break;
3949 }
3950
6be36555 3951 l2cap_chan_unlock(chan);
3df91ea2
AE		 3952
3953unlock:
3954 mutex_unlock(&conn->chan_lock);
3955
3956 return err;
1da177e4
LT		 3957}
3958
47d1ec61 3959static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3960{
3961 /* FCS is enabled only in ERTM or streaming mode, if one or both
3962 * sides request it.
3963 */
0c1bc5c6 3964 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3965 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3966 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3967 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3968}
3969
29d8a590
AE		 3970static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3971 u8 ident, u16 flags)
3972{
3973 struct l2cap_conn *conn = chan->conn;
3974
3975 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3976 flags);
3977
3978 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3979 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3980
3981 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3982 l2cap_build_conf_rsp(chan, data,
3983 L2CAP_CONF_SUCCESS, flags), data);
3984}
3985
662d652d
JH		 3986static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
3987 u16 scid, u16 dcid)
3988{
3989 struct l2cap_cmd_rej_cid rej;
3990
dcf4adbf 3991 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
662d652d
JH		 3992 rej.scid = __cpu_to_le16(scid);
3993 rej.dcid = __cpu_to_le16(dcid);
3994
3995 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3996}
3997
2d792818
GP		 3998static inline int l2cap_config_req(struct l2cap_conn *conn,
3999 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4000 u8 *data)
1da177e4
LT		 4001{
4002 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4003 u16 dcid, flags;
4004 u8 rsp[64];
48454079 4005 struct l2cap_chan *chan;
3c588192 4006 int len, err = 0;
1da177e4 4007
cb3b3152
JH		 4008 if (cmd_len < sizeof(*req))
4009 return -EPROTO;
4010
1da177e4
LT		 4011 dcid = __le16_to_cpu(req->dcid);
4012 flags = __le16_to_cpu(req->flags);
4013
4014 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4015
baa7e1fa 4016 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4017 if (!chan) {
4018 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4019 return 0;
4020 }
1da177e4 4021
033b1142 4022 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4023 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4024 chan->dcid);
354f60a9 4025 goto unlock;
df6bd743 4026 }
354f60a9 4027
5dee9e7c 4028 /* Reject if config buffer is too small. */
88219a0f 4029 len = cmd_len - sizeof(*req);
cb3b3152 4030 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4031 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4032 l2cap_build_conf_rsp(chan, rsp,
4033 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4034 goto unlock;
4035 }
4036
4037 /* Store config. */
73ffa904
GP		 4038 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4039 chan->conf_len += len;
1da177e4 4040
59e54bd1 4041 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4042 /* Incomplete config. Send empty response. */
4043 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4044 l2cap_build_conf_rsp(chan, rsp,
4045 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4046 goto unlock;
4047 }
4048
4049 /* Complete config. */
73ffa904 4050 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4051 if (len < 0) {
5e4e3972 4052 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4053 goto unlock;
f2fcfcd6 4054 }
1da177e4 4055
1500109b 4056 chan->ident = cmd->ident;
5dee9e7c 4057 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4058 chan->num_conf_rsp++;
5dee9e7c 4059
5dee9e7c 4060 /* Reset config buffer. */
73ffa904 4061 chan->conf_len = 0;
5dee9e7c 4062
c1360a1c 4063 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4064 goto unlock;
4065
c1360a1c 4066 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4067 set_default_fcs(chan);
fcc203c3 4068
105bdf9e
MM		 4069 if (chan->mode == L2CAP_MODE_ERTM ||
4070 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4071 err = l2cap_ertm_init(chan);
4072
4073 if (err < 0)
5e4e3972 4074 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4075 else
4076 l2cap_chan_ready(chan);
0565c1c2 4077
876d9484
MH		 4078 goto unlock;
4079 }
4080
c1360a1c 4081 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4082 u8 buf[64];
1da177e4 4083 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4084 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4085 chan->num_conf_req++;
1da177e4
LT		 4086 }
4087
49c922bb 4088 /* Got Conf Rsp PENDING from remote side and assume we sent
0e8b207e
AE		 4089 Conf Rsp PENDING in the code above */
4090 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4091 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4092
4093 /* check compatibility */
4094
79de886d 4095 /* Send rsp for BR/EDR channel */
f351bc72 4096 if (!chan->hs_hcon)
79de886d
AE		 4097 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4098 else
4099 chan->ident = cmd->ident;
0e8b207e
AE		 4100 }
4101
1da177e4 4102unlock:
6be36555 4103 l2cap_chan_unlock(chan);
3c588192 4104 return err;
1da177e4
LT		 4105}
4106
2d792818 4107static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4108 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4109 u8 *data)
1da177e4
LT		 4110{
4111 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4112 u16 scid, flags, result;
48454079 4113 struct l2cap_chan *chan;
cb3b3152 4114 int len = cmd_len - sizeof(*rsp);
3c588192 4115 int err = 0;
1da177e4 4116
cb3b3152
JH		 4117 if (cmd_len < sizeof(*rsp))
4118 return -EPROTO;
4119
1da177e4
LT		 4120 scid = __le16_to_cpu(rsp->scid);
4121 flags = __le16_to_cpu(rsp->flags);
4122 result = __le16_to_cpu(rsp->result);
4123
61386cba
AE		 4124 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4125 result, len);
1da177e4 4126
baa7e1fa 4127 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4128 if (!chan)
1da177e4
LT		 4129 return 0;
4130
4131 switch (result) {
4132 case L2CAP_CONF_SUCCESS:
47d1ec61 4133 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4134 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4135 break;
4136
0e8b207e
AE		 4137 case L2CAP_CONF_PENDING:
4138 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4139
4140 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4141 char buf[64];
4142
4143 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4144 buf, &result);
0e8b207e 4145 if (len < 0) {
5e4e3972 4146 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4147 goto done;
4148 }
4149
f351bc72 4150 if (!chan->hs_hcon) {
79de886d
AE		 4151 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4152 0);
5ce66b59
AE		 4153 } else {
4154 if (l2cap_check_efs(chan)) {
4155 amp_create_logical_link(chan);
4156 chan->ident = cmd->ident;
4157 }
4158 }
0e8b207e
AE		 4159 }
4160 goto done;
4161
1da177e4 4162 case L2CAP_CONF_UNACCEPT:
73ffa904 4163 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4164 char req[64];
4165
c2c77ec8 4166 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4167 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4168 goto done;
4169 }
4170
f2fcfcd6
GP		 4171 /* throw out any old stored conf requests */
4172 result = L2CAP_CONF_SUCCESS;
b4450035 4173 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4174 req, &result);
f2fcfcd6 4175 if (len < 0) {
5e4e3972 4176 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4177 goto done;
4178 }
4179
4180 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4181 L2CAP_CONF_REQ, len, req);
73ffa904 4182 chan->num_conf_req++;
f2fcfcd6
GP		 4183 if (result != L2CAP_CONF_SUCCESS)
4184 goto done;
4185 break;
1da177e4
LT		 4186 }
4187
8e87d142 4188 default:
6be36555 4189 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4190
ba13ccd9 4191 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4192 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4193 goto done;
4194 }
4195
59e54bd1 4196 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4197 goto done;
4198
c1360a1c 4199 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4200
c1360a1c 4201 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4202 set_default_fcs(chan);
fcc203c3 4203
105bdf9e
MM		 4204 if (chan->mode == L2CAP_MODE_ERTM ||
4205 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4206 err = l2cap_ertm_init(chan);
0565c1c2 4207
3c588192 4208 if (err < 0)
5e4e3972 4209 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4210 else
4211 l2cap_chan_ready(chan);
1da177e4
LT		 4212 }
4213
4214done:
6be36555 4215 l2cap_chan_unlock(chan);
3c588192 4216 return err;
1da177e4
LT		 4217}
4218
2d792818 4219static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4220 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4221 u8 *data)
1da177e4
LT		 4222{
4223 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4224 struct l2cap_disconn_rsp rsp;
4225 u16 dcid, scid;
48454079 4226 struct l2cap_chan *chan;
1da177e4 4227
cb3b3152
JH		 4228 if (cmd_len != sizeof(*req))
4229 return -EPROTO;
4230
1da177e4
LT		 4231 scid = __le16_to_cpu(req->scid);
4232 dcid = __le16_to_cpu(req->dcid);
4233
4234 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4235
3df91ea2
AE		 4236 mutex_lock(&conn->chan_lock);
4237
4238 chan = __l2cap_get_chan_by_scid(conn, dcid);
4239 if (!chan) {
4240 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4241 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4242 return 0;
3df91ea2 4243 }
1da177e4 4244
6be36555
AE		 4245 l2cap_chan_lock(chan);
4246
fe4128e0
GP		 4247 rsp.dcid = cpu_to_le16(chan->scid);
4248 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4249 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4250
5ec1bbe5 4251 chan->ops->set_shutdown(chan);
1da177e4 4252
61d6ef3e 4253 l2cap_chan_hold(chan);
48454079 4254 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4255
4256 l2cap_chan_unlock(chan);
1da177e4 4257
80b98027 4258 chan->ops->close(chan);
61d6ef3e 4259 l2cap_chan_put(chan);
3df91ea2
AE		 4260
4261 mutex_unlock(&conn->chan_lock);
4262
1da177e4
LT		 4263 return 0;
4264}
4265
2d792818 4266static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4267 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4268 u8 *data)
1da177e4
LT		 4269{
4270 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4271 u16 dcid, scid;
48454079 4272 struct l2cap_chan *chan;
1da177e4 4273
cb3b3152
JH		 4274 if (cmd_len != sizeof(*rsp))
4275 return -EPROTO;
4276
1da177e4
LT		 4277 scid = __le16_to_cpu(rsp->scid);
4278 dcid = __le16_to_cpu(rsp->dcid);
4279
4280 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4281
3df91ea2
AE		 4282 mutex_lock(&conn->chan_lock);
4283
4284 chan = __l2cap_get_chan_by_scid(conn, scid);
4285 if (!chan) {
4286 mutex_unlock(&conn->chan_lock);
1da177e4 4287 return 0;
3df91ea2 4288 }
1da177e4 4289
6be36555 4290 l2cap_chan_lock(chan);
48454079 4291
61d6ef3e 4292 l2cap_chan_hold(chan);
48454079 4293 l2cap_chan_del(chan, 0);
6be36555
AE		 4294
4295 l2cap_chan_unlock(chan);
1da177e4 4296
80b98027 4297 chan->ops->close(chan);
61d6ef3e 4298 l2cap_chan_put(chan);
3df91ea2
AE		 4299
4300 mutex_unlock(&conn->chan_lock);
4301
1da177e4
LT		 4302 return 0;
4303}
4304
2d792818 4305static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4306 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4307 u8 *data)
1da177e4
LT		 4308{
4309 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4310 u16 type;
4311
cb3b3152
JH		 4312 if (cmd_len != sizeof(*req))
4313 return -EPROTO;
4314
1da177e4
LT		 4315 type = __le16_to_cpu(req->type);
4316
4317 BT_DBG("type 0x%4.4x", type);
4318
f0709e03
MH		 4319 if (type == L2CAP_IT_FEAT_MASK) {
4320 u8 buf[8];
44dd46de 4321 u32 feat_mask = l2cap_feat_mask;
f0709e03 4322 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
dcf4adbf
JP		 4323 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4324 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4325 if (!disable_ertm)
fcc203c3 4326 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4327 | L2CAP_FEAT_FCS;
848566b3 4328 if (conn->hs_enabled)
6327eb98 4329 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4330 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4331
1b7bf4ed 4332 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4333 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4334 buf);
e1027a7c
MH		 4335 } else if (type == L2CAP_IT_FIXED_CHAN) {
4336 u8 buf[12];
4337 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4338
848566b3 4339 if (conn->hs_enabled)
50a147cd
MM		 4340 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4341 else
4342 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4343
dcf4adbf
JP		 4344 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4345 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4346 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4347 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4348 buf);
f0709e03
MH		 4349 } else {
4350 struct l2cap_info_rsp rsp;
4351 rsp.type = cpu_to_le16(type);
dcf4adbf 4352 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4353 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4354 &rsp);
f0709e03 4355 }
1da177e4
LT		 4356
4357 return 0;
4358}
4359
2d792818 4360static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4361 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4362 u8 *data)
1da177e4
LT		 4363{
4364 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4365 u16 type, result;
4366
3f6fa3d4 4367 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4368 return -EPROTO;
4369
1da177e4
LT		 4370 type = __le16_to_cpu(rsp->type);
4371 result = __le16_to_cpu(rsp->result);
4372
4373 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4374
e90165be
AE		 4375 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4376 if (cmd->ident != conn->info_ident ||
2d792818 4377 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4378 return 0;
4379
17cd3f37 4380 cancel_delayed_work(&conn->info_timer);
4e8402a3 4381
adb08ede
VT		 4382 if (result != L2CAP_IR_SUCCESS) {
4383 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4384 conn->info_ident = 0;
4385
4386 l2cap_conn_start(conn);
4387
4388 return 0;
4389 }
4390
978c93b9
AE		 4391 switch (type) {
4392 case L2CAP_IT_FEAT_MASK:
83985319 4393 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4394
47ec1dcd 4395 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4396 struct l2cap_info_req req;
dcf4adbf 4397 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4398
4399 conn->info_ident = l2cap_get_ident(conn);
4400
4401 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4402 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4403 } else {
4404 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4405 conn->info_ident = 0;
4406
4407 l2cap_conn_start(conn);
4408 }
978c93b9
AE		 4409 break;
4410
4411 case L2CAP_IT_FIXED_CHAN:
4412 conn->fixed_chan_mask = rsp->data[0];
984947dc 4413 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4414 conn->info_ident = 0;
984947dc
MH		 4415
4416 l2cap_conn_start(conn);
978c93b9 4417 break;
984947dc 4418 }
4e8402a3 4419
1da177e4
LT		 4420 return 0;
4421}
4422
1700915f
MM		 4423static int l2cap_create_channel_req(struct l2cap_conn *conn,
4424 struct l2cap_cmd_hdr *cmd,
4425 u16 cmd_len, void *data)
f94ff6ff
MM		 4426{
4427 struct l2cap_create_chan_req *req = data;
6e1df6a6 4428 struct l2cap_create_chan_rsp rsp;
1700915f 4429 struct l2cap_chan *chan;
6e1df6a6 4430 struct hci_dev *hdev;
f94ff6ff
MM		 4431 u16 psm, scid;
4432
4433 if (cmd_len != sizeof(*req))
4434 return -EPROTO;
4435
848566b3 4436 if (!conn->hs_enabled)
f94ff6ff
MM		 4437 return -EINVAL;
4438
4439 psm = le16_to_cpu(req->psm);
4440 scid = le16_to_cpu(req->scid);
4441
ad0ac6ca 4442 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4443
6e1df6a6 4444 /* For controller id 0 make BR/EDR connection */
6ed971ca 4445 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4446 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4447 req->amp_id);
4448 return 0;
4449 }
1700915f 4450
6e1df6a6
AE		 4451 /* Validate AMP controller id */
4452 hdev = hci_dev_get(req->amp_id);
4453 if (!hdev)
4454 goto error;
1700915f 4455
6e1df6a6
AE		 4456 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4457 hci_dev_put(hdev);
4458 goto error;
4459 }
1700915f 4460
6e1df6a6
AE		 4461 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4462 req->amp_id);
4463 if (chan) {
4464 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4465 struct hci_conn *hs_hcon;
1700915f 4466
98e0f7ea
MH		 4467 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4468 &conn->hcon->dst);
6e1df6a6
AE		 4469 if (!hs_hcon) {
4470 hci_dev_put(hdev);
662d652d
JH		 4471 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4472 chan->dcid);
4473 return 0;
1700915f
MM		 4474 }
4475
6e1df6a6
AE		 4476 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4477
6e1df6a6
AE		 4478 mgr->bredr_chan = chan;
4479 chan->hs_hcon = hs_hcon;
fd45bf4c 4480 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4481 conn->mtu = hdev->block_mtu;
1700915f 4482 }
f94ff6ff 4483
6e1df6a6 4484 hci_dev_put(hdev);
f94ff6ff
MM		 4485
4486 return 0;
6e1df6a6
AE		 4487
4488error:
4489 rsp.dcid = 0;
4490 rsp.scid = cpu_to_le16(scid);
dcf4adbf
JP		 4491 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4492 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
6e1df6a6
AE		 4493
4494 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4495 sizeof(rsp), &rsp);
4496
dc280801 4497 return 0;
f94ff6ff
MM		 4498}
4499
8eb200bd
MM		 4500static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4501{
4502 struct l2cap_move_chan_req req;
4503 u8 ident;
4504
4505 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4506
4507 ident = l2cap_get_ident(chan->conn);
4508 chan->ident = ident;
4509
4510 req.icid = cpu_to_le16(chan->scid);
4511 req.dest_amp_id = dest_amp_id;
4512
4513 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4514 &req);
4515
4516 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4517}
4518
1500109b 4519static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4520{
4521 struct l2cap_move_chan_rsp rsp;
4522
1500109b 4523 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4524
1500109b 4525 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4526 rsp.result = cpu_to_le16(result);
4527
1500109b
MM		 4528 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4529 sizeof(rsp), &rsp);
8d5a04a1
MM		 4530}
4531
5b155ef9 4532static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4533{
4534 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4535
5b155ef9 4536 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4537
5b155ef9 4538 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4539
5b155ef9 4540 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4541 cfm.result = cpu_to_le16(result);
4542
5b155ef9
MM		 4543 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4544 sizeof(cfm), &cfm);
4545
4546 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4547}
4548
4549static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4550{
4551 struct l2cap_move_chan_cfm cfm;
4552
4553 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4554
4555 cfm.icid = cpu_to_le16(icid);
dcf4adbf 4556 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
5b155ef9
MM		 4557
4558 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4559 sizeof(cfm), &cfm);
8d5a04a1
MM		 4560}
4561
4562static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4563 u16 icid)
8d5a04a1
MM		 4564{
4565 struct l2cap_move_chan_cfm_rsp rsp;
4566
ad0ac6ca 4567 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4568
4569 rsp.icid = cpu_to_le16(icid);
4570 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4571}
4572
5f3847a4
MM		 4573static void __release_logical_link(struct l2cap_chan *chan)
4574{
4575 chan->hs_hchan = NULL;
4576 chan->hs_hcon = NULL;
4577
4578 /* Placeholder - release the logical link */
4579}
4580
1500109b
MM		 4581static void l2cap_logical_fail(struct l2cap_chan *chan)
4582{
4583 /* Logical link setup failed */
4584 if (chan->state != BT_CONNECTED) {
4585 /* Create channel failure, disconnect */
5e4e3972 4586 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4587 return;
4588 }
4589
4590 switch (chan->move_role) {
4591 case L2CAP_MOVE_ROLE_RESPONDER:
4592 l2cap_move_done(chan);
4593 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4594 break;
4595 case L2CAP_MOVE_ROLE_INITIATOR:
4596 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4597 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4598 /* Remote has only sent pending or
4599 * success responses, clean up
4600 */
4601 l2cap_move_done(chan);
4602 }
4603
4604 /* Other amp move states imply that the move
4605 * has already aborted
4606 */
4607 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4608 break;
4609 }
4610}
4611
4612static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4613 struct hci_chan *hchan)
4614{
4615 struct l2cap_conf_rsp rsp;
1500109b 4616
336178a3 4617 chan->hs_hchan = hchan;
1500109b
MM		 4618 chan->hs_hcon->l2cap_data = chan->conn;
4619
35ba9561 4620 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4621
4622 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4623 int err;
1500109b
MM		 4624
4625 set_default_fcs(chan);
4626
4627 err = l2cap_ertm_init(chan);
4628 if (err < 0)
5e4e3972 4629 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4630 else
4631 l2cap_chan_ready(chan);
4632 }
4633}
4634
4635static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4636 struct hci_chan *hchan)
4637{
4638 chan->hs_hcon = hchan->conn;
4639 chan->hs_hcon->l2cap_data = chan->conn;
4640
4641 BT_DBG("move_state %d", chan->move_state);
4642
4643 switch (chan->move_state) {
4644 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4645 /* Move confirm will be sent after a success
4646 * response is received
4647 */
4648 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4649 break;
4650 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4651 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4652 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4653 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4654 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4655 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4656 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4657 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4658 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4659 }
4660 break;
4661 default:
4662 /* Move was not in expected state, free the channel */
4663 __release_logical_link(chan);
4664
4665 chan->move_state = L2CAP_MOVE_STABLE;
4666 }
4667}
4668
4669/* Call with chan locked */
27695fb4
AE		 4670void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4671 u8 status)
5b155ef9 4672{
1500109b
MM		 4673 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4674
4675 if (status) {
4676 l2cap_logical_fail(chan);
4677 __release_logical_link(chan);
4678 return;
4679 }
4680
4681 if (chan->state != BT_CONNECTED) {
4682 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4683 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4684 l2cap_logical_finish_create(chan, hchan);
4685 } else {
4686 l2cap_logical_finish_move(chan, hchan);
4687 }
5b155ef9
MM		 4688}
4689
3f7a56c4
MM		 4690void l2cap_move_start(struct l2cap_chan *chan)
4691{
4692 BT_DBG("chan %p", chan);
4693
6ed971ca 4694 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4695 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4696 return;
4697 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4698 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4699 /* Placeholder - start physical link setup */
4700 } else {
4701 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4702 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4703 chan->move_id = 0;
4704 l2cap_move_setup(chan);
4705 l2cap_send_move_chan_req(chan, 0);
4706 }
4707}
4708
8eb200bd
MM		 4709static void l2cap_do_create(struct l2cap_chan *chan, int result,
4710 u8 local_amp_id, u8 remote_amp_id)
4711{
62748ca1
AE		 4712 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4713 local_amp_id, remote_amp_id);
4714
12d6cc60
AE		 4715 chan->fcs = L2CAP_FCS_NONE;
4716
62748ca1
AE		 4717 /* Outgoing channel on AMP */
4718 if (chan->state == BT_CONNECT) {
4719 if (result == L2CAP_CR_SUCCESS) {
4720 chan->local_amp_id = local_amp_id;
4721 l2cap_send_create_chan_req(chan, remote_amp_id);
4722 } else {
4723 /* Revert to BR/EDR connect */
4724 l2cap_send_conn_req(chan);
4725 }
4726
4727 return;
4728 }
4729
4730 /* Incoming channel on AMP */
4731 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4732 struct l2cap_conn_rsp rsp;
4733 char buf[128];
4734 rsp.scid = cpu_to_le16(chan->dcid);
4735 rsp.dcid = cpu_to_le16(chan->scid);
4736
8eb200bd
MM		 4737 if (result == L2CAP_CR_SUCCESS) {
4738 /* Send successful response */
dcf4adbf
JP		 4739 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4740 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4741 } else {
4742 /* Send negative response */
dcf4adbf
JP		 4743 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4744 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4745 }
4746
4747 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4748 sizeof(rsp), &rsp);
4749
4750 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4751 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4752 set_bit(CONF_REQ_SENT, &chan->conf_state);
4753 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4754 L2CAP_CONF_REQ,
4755 l2cap_build_conf_req(chan, buf), buf);
4756 chan->num_conf_req++;
4757 }
8eb200bd
MM		 4758 }
4759}
4760
4761static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4762 u8 remote_amp_id)
4763{
4764 l2cap_move_setup(chan);
4765 chan->move_id = local_amp_id;
4766 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4767
4768 l2cap_send_move_chan_req(chan, remote_amp_id);
4769}
4770
4771static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4772{
4773 struct hci_chan *hchan = NULL;
4774
4775 /* Placeholder - get hci_chan for logical link */
4776
4777 if (hchan) {
4778 if (hchan->state == BT_CONNECTED) {
4779 /* Logical link is ready to go */
4780 chan->hs_hcon = hchan->conn;
4781 chan->hs_hcon->l2cap_data = chan->conn;
4782 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4783 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4784
4785 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4786 } else {
4787 /* Wait for logical link to be ready */
4788 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4789 }
4790 } else {
4791 /* Logical link not available */
4792 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4793 }
4794}
4795
4796static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4797{
4798 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4799 u8 rsp_result;
4800 if (result == -EINVAL)
4801 rsp_result = L2CAP_MR_BAD_ID;
4802 else
4803 rsp_result = L2CAP_MR_NOT_ALLOWED;
4804
4805 l2cap_send_move_chan_rsp(chan, rsp_result);
4806 }
4807
4808 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4809 chan->move_state = L2CAP_MOVE_STABLE;
4810
4811 /* Restart data transmission */
4812 l2cap_ertm_send(chan);
4813}
4814
a514b17f
AE		 4815/* Invoke with locked chan */
4816void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4817{
770bfefa 4818 u8 local_amp_id = chan->local_amp_id;
fffadc08 4819 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4820
8eb200bd
MM		 4821 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4822 chan, result, local_amp_id, remote_amp_id);
4823
8eb200bd
MM		 4824 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4825 l2cap_chan_unlock(chan);
4826 return;
4827 }
4828
4829 if (chan->state != BT_CONNECTED) {
4830 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4831 } else if (result != L2CAP_MR_SUCCESS) {
4832 l2cap_do_move_cancel(chan, result);
4833 } else {
4834 switch (chan->move_role) {
4835 case L2CAP_MOVE_ROLE_INITIATOR:
4836 l2cap_do_move_initiate(chan, local_amp_id,
4837 remote_amp_id);
4838 break;
4839 case L2CAP_MOVE_ROLE_RESPONDER:
4840 l2cap_do_move_respond(chan, result);
4841 break;
4842 default:
4843 l2cap_do_move_cancel(chan, result);
4844 break;
4845 }
4846 }
8eb200bd
MM		 4847}
4848
8d5a04a1 4849static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4850 struct l2cap_cmd_hdr *cmd,
4851 u16 cmd_len, void *data)
8d5a04a1
MM		 4852{
4853 struct l2cap_move_chan_req *req = data;
1500109b 4854 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4855 struct l2cap_chan *chan;
8d5a04a1
MM		 4856 u16 icid = 0;
4857 u16 result = L2CAP_MR_NOT_ALLOWED;
4858
4859 if (cmd_len != sizeof(*req))
4860 return -EPROTO;
4861
4862 icid = le16_to_cpu(req->icid);
4863
ad0ac6ca 4864 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4865
848566b3 4866 if (!conn->hs_enabled)
8d5a04a1
MM		 4867 return -EINVAL;
4868
02b0fbb9
MM		 4869 chan = l2cap_get_chan_by_dcid(conn, icid);
4870 if (!chan) {
1500109b 4871 rsp.icid = cpu_to_le16(icid);
dcf4adbf 4872 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
1500109b
MM		 4873 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4874 sizeof(rsp), &rsp);
02b0fbb9
MM		 4875 return 0;
4876 }
4877
1500109b
MM		 4878 chan->ident = cmd->ident;
4879
02b0fbb9
MM		 4880 if (chan->scid < L2CAP_CID_DYN_START ||
4881 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4882 (chan->mode != L2CAP_MODE_ERTM &&
4883 chan->mode != L2CAP_MODE_STREAMING)) {
4884 result = L2CAP_MR_NOT_ALLOWED;
4885 goto send_move_response;
4886 }
4887
4888 if (chan->local_amp_id == req->dest_amp_id) {
4889 result = L2CAP_MR_SAME_ID;
4890 goto send_move_response;
4891 }
4892
6ed971ca 4893 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4894 struct hci_dev *hdev;
4895 hdev = hci_dev_get(req->dest_amp_id);
4896 if (!hdev || hdev->dev_type != HCI_AMP ||
4897 !test_bit(HCI_UP, &hdev->flags)) {
4898 if (hdev)
4899 hci_dev_put(hdev);
4900
4901 result = L2CAP_MR_BAD_ID;
4902 goto send_move_response;
4903 }
4904 hci_dev_put(hdev);
4905 }
4906
4907 /* Detect a move collision. Only send a collision response
4908 * if this side has "lost", otherwise proceed with the move.
4909 * The winner has the larger bd_addr.
4910 */
4911 if ((__chan_is_moving(chan) ||
4912 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4913 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4914 result = L2CAP_MR_COLLISION;
4915 goto send_move_response;
4916 }
4917
02b0fbb9
MM		 4918 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4919 l2cap_move_setup(chan);
4920 chan->move_id = req->dest_amp_id;
4921 icid = chan->dcid;
4922
6ed971ca 4923 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4924 /* Moving to BR/EDR */
4925 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4926 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4927 result = L2CAP_MR_PEND;
4928 } else {
4929 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4930 result = L2CAP_MR_SUCCESS;
4931 }
4932 } else {
4933 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4934 /* Placeholder - uncomment when amp functions are available */
4935 /*amp_accept_physical(chan, req->dest_amp_id);*/
4936 result = L2CAP_MR_PEND;
4937 }
4938
4939send_move_response:
1500109b 4940 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4941
02b0fbb9
MM		 4942 l2cap_chan_unlock(chan);
4943
8d5a04a1
MM		 4944 return 0;
4945}
4946
5b155ef9
MM		 4947static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4948{
4949 struct l2cap_chan *chan;
4950 struct hci_chan *hchan = NULL;
4951
4952 chan = l2cap_get_chan_by_scid(conn, icid);
4953 if (!chan) {
4954 l2cap_send_move_chan_cfm_icid(conn, icid);
4955 return;
4956 }
4957
4958 __clear_chan_timer(chan);
4959 if (result == L2CAP_MR_PEND)
4960 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4961
4962 switch (chan->move_state) {
4963 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4964 /* Move confirm will be sent when logical link
4965 * is complete.
4966 */
4967 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4968 break;
4969 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4970 if (result == L2CAP_MR_PEND) {
4971 break;
4972 } else if (test_bit(CONN_LOCAL_BUSY,
4973 &chan->conn_state)) {
4974 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4975 } else {
4976 /* Logical link is up or moving to BR/EDR,
4977 * proceed with move
4978 */
4979 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4980 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4981 }
4982 break;
4983 case L2CAP_MOVE_WAIT_RSP:
4984 /* Moving to AMP */
4985 if (result == L2CAP_MR_SUCCESS) {
4986 /* Remote is ready, send confirm immediately
4987 * after logical link is ready
4988 */
4989 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4990 } else {
4991 /* Both logical link and move success
4992 * are required to confirm
4993 */
4994 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4995 }
4996
4997 /* Placeholder - get hci_chan for logical link */
4998 if (!hchan) {
4999 /* Logical link not available */
5000 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5001 break;
5002 }
5003
5004 /* If the logical link is not yet connected, do not
5005 * send confirmation.
5006 */
5007 if (hchan->state != BT_CONNECTED)
5008 break;
5009
5010 /* Logical link is already ready to go */
5011
5012 chan->hs_hcon = hchan->conn;
5013 chan->hs_hcon->l2cap_data = chan->conn;
5014
5015 if (result == L2CAP_MR_SUCCESS) {
5016 /* Can confirm now */
5017 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5018 } else {
5019 /* Now only need move success
5020 * to confirm
5021 */
5022 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5023 }
5024
5025 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5026 break;
5027 default:
5028 /* Any other amp move state means the move failed. */
5029 chan->move_id = chan->local_amp_id;
5030 l2cap_move_done(chan);
5031 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5032 }
5033
5034 l2cap_chan_unlock(chan);
5035}
5036
5037static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5038 u16 result)
5039{
5040 struct l2cap_chan *chan;
5041
5042 chan = l2cap_get_chan_by_ident(conn, ident);
5043 if (!chan) {
5044 /* Could not locate channel, icid is best guess */
5045 l2cap_send_move_chan_cfm_icid(conn, icid);
5046 return;
5047 }
5048
5049 __clear_chan_timer(chan);
5050
5051 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5052 if (result == L2CAP_MR_COLLISION) {
5053 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5054 } else {
5055 /* Cleanup - cancel move */
5056 chan->move_id = chan->local_amp_id;
5057 l2cap_move_done(chan);
5058 }
5059 }
5060
5061 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5062
5063 l2cap_chan_unlock(chan);
5064}
5065
5066static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5067 struct l2cap_cmd_hdr *cmd,
5068 u16 cmd_len, void *data)
8d5a04a1
MM		 5069{
5070 struct l2cap_move_chan_rsp *rsp = data;
5071 u16 icid, result;
5072
5073 if (cmd_len != sizeof(*rsp))
5074 return -EPROTO;
5075
5076 icid = le16_to_cpu(rsp->icid);
5077 result = le16_to_cpu(rsp->result);
5078
ad0ac6ca 5079 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5080
5b155ef9
MM		 5081 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5082 l2cap_move_continue(conn, icid, result);
5083 else
5084 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5085
5086 return 0;
5087}
5088
5f3847a4
MM		 5089static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5090 struct l2cap_cmd_hdr *cmd,
5091 u16 cmd_len, void *data)
8d5a04a1
MM		 5092{
5093 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5094 struct l2cap_chan *chan;
8d5a04a1
MM		 5095 u16 icid, result;
5096
5097 if (cmd_len != sizeof(*cfm))
5098 return -EPROTO;
5099
5100 icid = le16_to_cpu(cfm->icid);
5101 result = le16_to_cpu(cfm->result);
5102
ad0ac6ca 5103 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5104
5f3847a4
MM		 5105 chan = l2cap_get_chan_by_dcid(conn, icid);
5106 if (!chan) {
5107 /* Spec requires a response even if the icid was not found */
5108 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5109 return 0;
5110 }
5111
5112 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5113 if (result == L2CAP_MC_CONFIRMED) {
5114 chan->local_amp_id = chan->move_id;
6ed971ca 5115 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5116 __release_logical_link(chan);
5117 } else {
5118 chan->move_id = chan->local_amp_id;
5119 }
5120
5121 l2cap_move_done(chan);
5122 }
5123
8d5a04a1
MM		 5124 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5125
5f3847a4
MM		 5126 l2cap_chan_unlock(chan);
5127
8d5a04a1
MM		 5128 return 0;
5129}
5130
5131static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5132 struct l2cap_cmd_hdr *cmd,
5133 u16 cmd_len, void *data)
8d5a04a1
MM		 5134{
5135 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5136 struct l2cap_chan *chan;
8d5a04a1
MM		 5137 u16 icid;
5138
5139 if (cmd_len != sizeof(*rsp))
5140 return -EPROTO;
5141
5142 icid = le16_to_cpu(rsp->icid);
5143
ad0ac6ca 5144 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5145
3fd71a0a
MM		 5146 chan = l2cap_get_chan_by_scid(conn, icid);
5147 if (!chan)
5148 return 0;
5149
5150 __clear_chan_timer(chan);
5151
5152 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5153 chan->local_amp_id = chan->move_id;
5154
6ed971ca 5155 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5156 __release_logical_link(chan);
5157
5158 l2cap_move_done(chan);
5159 }
5160
5161 l2cap_chan_unlock(chan);
5162
8d5a04a1
MM		 5163 return 0;
5164}
5165
de73115a 5166static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5167 struct l2cap_cmd_hdr *cmd,
203e639e 5168 u16 cmd_len, u8 *data)
de73115a
CT		 5169{
5170 struct hci_conn *hcon = conn->hcon;
5171 struct l2cap_conn_param_update_req *req;
5172 struct l2cap_conn_param_update_rsp rsp;
203e639e 5173 u16 min, max, latency, to_multiplier;
2ce603eb 5174 int err;
de73115a 5175
40bef302 5176 if (hcon->role != HCI_ROLE_MASTER)
de73115a
CT		 5177 return -EINVAL;
5178
de73115a
CT		 5179 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5180 return -EPROTO;
5181
5182 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5183 min = __le16_to_cpu(req->min);
5184 max = __le16_to_cpu(req->max);
de73115a
CT		 5185 latency = __le16_to_cpu(req->latency);
5186 to_multiplier = __le16_to_cpu(req->to_multiplier);
5187
5188 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5189 min, max, latency, to_multiplier);
de73115a
CT		 5190
5191 memset(&rsp, 0, sizeof(rsp));
2ce603eb 5192
d4905f24 5193 err = hci_check_conn_params(min, max, latency, to_multiplier);
2ce603eb 5194 if (err)
dcf4adbf 5195 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5196 else
dcf4adbf 5197 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5198
5199 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5200 sizeof(rsp), &rsp);
de73115a 5201
ffb5a827 5202 if (!err) {
f4869e2a
JH		 5203 u8 store_hint;
5204
5205 store_hint = hci_le_conn_update(hcon, min, max, latency,
5206 to_multiplier);
ffb5a827 5207 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
f4869e2a
JH		 5208 store_hint, min, max, latency,
5209 to_multiplier);
ffb5a827 5210
ffb5a827 5211 }
2ce603eb 5212
de73115a
CT		 5213 return 0;
5214}
5215
f1496dee
JH		 5216static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5217 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5218 u8 *data)
5219{
5220 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5221 u16 dcid, mtu, mps, credits, result;
5222 struct l2cap_chan *chan;
5223 int err;
5224
5225 if (cmd_len < sizeof(*rsp))
5226 return -EPROTO;
5227
5228 dcid = __le16_to_cpu(rsp->dcid);
5229 mtu = __le16_to_cpu(rsp->mtu);
5230 mps = __le16_to_cpu(rsp->mps);
5231 credits = __le16_to_cpu(rsp->credits);
5232 result = __le16_to_cpu(rsp->result);
5233
5234 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5235 return -EPROTO;
5236
5237 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5238 dcid, mtu, mps, credits, result);
5239
5240 mutex_lock(&conn->chan_lock);
5241
5242 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5243 if (!chan) {
5244 err = -EBADSLT;
5245 goto unlock;
5246 }
5247
5248 err = 0;
5249
5250 l2cap_chan_lock(chan);
5251
5252 switch (result) {
5253 case L2CAP_CR_SUCCESS:
5254 chan->ident = 0;
5255 chan->dcid = dcid;
5256 chan->omtu = mtu;
5257 chan->remote_mps = mps;
0cd75f7e 5258 chan->tx_credits = credits;
f1496dee
JH		 5259 l2cap_chan_ready(chan);
5260 break;
5261
5262 default:
5263 l2cap_chan_del(chan, ECONNREFUSED);
5264 break;
5265 }
5266
5267 l2cap_chan_unlock(chan);
5268
5269unlock:
5270 mutex_unlock(&conn->chan_lock);
5271
5272 return err;
5273}
5274
3300d9a9 5275static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5276 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5277 u8 *data)
3300d9a9
CT		 5278{
5279 int err = 0;
5280
5281 switch (cmd->code) {
5282 case L2CAP_COMMAND_REJ:
cb3b3152 5283 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5284 break;
5285
5286 case L2CAP_CONN_REQ:
cb3b3152 5287 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5288 break;
5289
5290 case L2CAP_CONN_RSP:
f5a2598d 5291 case L2CAP_CREATE_CHAN_RSP:
9245e737 5292 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5293 break;
5294
5295 case L2CAP_CONF_REQ:
5296 err = l2cap_config_req(conn, cmd, cmd_len, data);
5297 break;
5298
5299 case L2CAP_CONF_RSP:
9245e737 5300 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5301 break;
5302
5303 case L2CAP_DISCONN_REQ:
cb3b3152 5304 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5305 break;
5306
5307 case L2CAP_DISCONN_RSP:
9245e737 5308 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5309 break;
5310
5311 case L2CAP_ECHO_REQ:
5312 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5313 break;
5314
5315 case L2CAP_ECHO_RSP:
5316 break;
5317
5318 case L2CAP_INFO_REQ:
cb3b3152 5319 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5320 break;
5321
5322 case L2CAP_INFO_RSP:
9245e737 5323 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5324 break;
5325
f94ff6ff
MM		 5326 case L2CAP_CREATE_CHAN_REQ:
5327 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5328 break;
5329
8d5a04a1
MM		 5330 case L2CAP_MOVE_CHAN_REQ:
5331 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5332 break;
5333
5334 case L2CAP_MOVE_CHAN_RSP:
9245e737 5335 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5336 break;
5337
5338 case L2CAP_MOVE_CHAN_CFM:
5339 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5340 break;
5341
5342 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5343 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5344 break;
5345
3300d9a9
CT		 5346 default:
5347 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5348 err = -EINVAL;
5349 break;
5350 }
5351
5352 return err;
5353}
5354
27e2d4c8
JH		 5355static int l2cap_le_connect_req(struct l2cap_conn *conn,
5356 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5357 u8 *data)
5358{
5359 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5360 struct l2cap_le_conn_rsp rsp;
5361 struct l2cap_chan *chan, *pchan;
0cd75f7e 5362 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5363 __le16 psm;
5364 u8 result;
5365
5366 if (cmd_len != sizeof(*req))
5367 return -EPROTO;
5368
5369 scid = __le16_to_cpu(req->scid);
5370 mtu = __le16_to_cpu(req->mtu);
5371 mps = __le16_to_cpu(req->mps);
5372 psm = req->psm;
5373 dcid = 0;
0cd75f7e 5374 credits = 0;
27e2d4c8
JH		 5375
5376 if (mtu < 23 || mps < 23)
5377 return -EPROTO;
5378
5379 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5380 scid, mtu, mps);
5381
5382 /* Check if we have socket listening on psm */
5383 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5384 &conn->hcon->dst, LE_LINK);
5385 if (!pchan) {
5386 result = L2CAP_CR_BAD_PSM;
5387 chan = NULL;
5388 goto response;
5389 }
5390
5391 mutex_lock(&conn->chan_lock);
5392 l2cap_chan_lock(pchan);
5393
5394 if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
5395 result = L2CAP_CR_AUTHENTICATION;
5396 chan = NULL;
5397 goto response_unlock;
5398 }
5399
5400 /* Check if we already have channel with that dcid */
5401 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5402 result = L2CAP_CR_NO_MEM;
5403 chan = NULL;
5404 goto response_unlock;
5405 }
5406
5407 chan = pchan->ops->new_connection(pchan);
5408 if (!chan) {
5409 result = L2CAP_CR_NO_MEM;
5410 goto response_unlock;
5411 }
5412
0ce43ce6
JH		 5413 l2cap_le_flowctl_init(chan);
5414
27e2d4c8
JH		 5415 bacpy(&chan->src, &conn->hcon->src);
5416 bacpy(&chan->dst, &conn->hcon->dst);
5417 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
5418 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
5419 chan->psm = psm;
5420 chan->dcid = scid;
5421 chan->omtu = mtu;
5422 chan->remote_mps = mps;
0cd75f7e 5423 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5424
5425 __l2cap_chan_add(conn, chan);
5426 dcid = chan->scid;
0cd75f7e 5427 credits = chan->rx_credits;
27e2d4c8
JH		 5428
5429 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5430
5431 chan->ident = cmd->ident;
5432
5433 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5434 l2cap_state_change(chan, BT_CONNECT2);
434714dc
JH		 5435 /* The following result value is actually not defined
5436 * for LE CoC but we use it to let the function know
5437 * that it should bail out after doing its cleanup
5438 * instead of sending a response.
5439 */
27e2d4c8
JH		 5440 result = L2CAP_CR_PEND;
5441 chan->ops->defer(chan);
5442 } else {
5443 l2cap_chan_ready(chan);
5444 result = L2CAP_CR_SUCCESS;
5445 }
5446
5447response_unlock:
5448 l2cap_chan_unlock(pchan);
5449 mutex_unlock(&conn->chan_lock);
a24cce14 5450 l2cap_chan_put(pchan);
27e2d4c8
JH		 5451
5452 if (result == L2CAP_CR_PEND)
5453 return 0;
5454
5455response:
5456 if (chan) {
5457 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5458 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5459 } else {
5460 rsp.mtu = 0;
5461 rsp.mps = 0;
5462 }
5463
5464 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5465 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5466 rsp.result = cpu_to_le16(result);
5467
5468 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5469
5470 return 0;
5471}
5472
fad5fc89
JH		 5473static inline int l2cap_le_credits(struct l2cap_conn *conn,
5474 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5475 u8 *data)
5476{
5477 struct l2cap_le_credits *pkt;
5478 struct l2cap_chan *chan;
0f1bfe4e 5479 u16 cid, credits, max_credits;
fad5fc89
JH		 5480
5481 if (cmd_len != sizeof(*pkt))
5482 return -EPROTO;
5483
5484 pkt = (struct l2cap_le_credits *) data;
5485 cid = __le16_to_cpu(pkt->cid);
5486 credits = __le16_to_cpu(pkt->credits);
5487
5488 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5489
5490 chan = l2cap_get_chan_by_dcid(conn, cid);
5491 if (!chan)
5492 return -EBADSLT;
5493
0f1bfe4e
JH		 5494 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5495 if (credits > max_credits) {
5496 BT_ERR("LE credits overflow");
5497 l2cap_send_disconn_req(chan, ECONNRESET);
ee93053d 5498 l2cap_chan_unlock(chan);
0f1bfe4e
JH		 5499
5500 /* Return 0 so that we don't trigger an unnecessary
5501 * command reject packet.
5502 */
5503 return 0;
5504 }
5505
fad5fc89
JH		 5506 chan->tx_credits += credits;
5507
5508 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5509 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5510 chan->tx_credits--;
5511 }
5512
5513 if (chan->tx_credits)
5514 chan->ops->resume(chan);
5515
5516 l2cap_chan_unlock(chan);
5517
5518 return 0;
5519}
5520
71fb4197
JH		 5521static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5522 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5523 u8 *data)
5524{
5525 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5526 struct l2cap_chan *chan;
5527
5528 if (cmd_len < sizeof(*rej))
5529 return -EPROTO;
5530
5531 mutex_lock(&conn->chan_lock);
5532
5533 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5534 if (!chan)
5535 goto done;
5536
5537 l2cap_chan_lock(chan);
5538 l2cap_chan_del(chan, ECONNREFUSED);
5539 l2cap_chan_unlock(chan);
5540
5541done:
5542 mutex_unlock(&conn->chan_lock);
5543 return 0;
5544}
5545
3300d9a9 5546static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5547 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5548 u8 *data)
3300d9a9 5549{
b5ecba64
JH		 5550 int err = 0;
5551
3300d9a9
CT		 5552 switch (cmd->code) {
5553 case L2CAP_COMMAND_REJ:
71fb4197 5554 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5555 break;
3300d9a9
CT		 5556
5557 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5558 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5559 break;
3300d9a9
CT		 5560
5561 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5562 break;
3300d9a9 5563
f1496dee
JH		 5564 case L2CAP_LE_CONN_RSP:
5565 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5566 break;
f1496dee 5567
27e2d4c8 5568 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5569 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5570 break;
27e2d4c8 5571
fad5fc89
JH		 5572 case L2CAP_LE_CREDITS:
5573 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5574 break;
5575
3defe01a 5576 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5577 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5578 break;
3defe01a
JH		 5579
5580 case L2CAP_DISCONN_RSP:
5581 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5582 break;
3defe01a 5583
3300d9a9
CT		 5584 default:
5585 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5586 err = -EINVAL;
5587 break;
3300d9a9 5588 }
b5ecba64
JH		 5589
5590 return err;
3300d9a9
CT		 5591}
5592
c5623556
JH		 5593static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5594 struct sk_buff *skb)
5595{
69c4e4e8 5596 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5597 struct l2cap_cmd_hdr *cmd;
5598 u16 len;
c5623556
JH		 5599 int err;
5600
69c4e4e8 5601 if (hcon->type != LE_LINK)
3b166295 5602 goto drop;
69c4e4e8 5603
4f3e219d
MH		 5604 if (skb->len < L2CAP_CMD_HDR_SIZE)
5605 goto drop;
c5623556 5606
4f3e219d
MH		 5607 cmd = (void *) skb->data;
5608 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5609
4f3e219d 5610 len = le16_to_cpu(cmd->len);
c5623556 5611
4f3e219d 5612 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5613
4f3e219d
MH		 5614 if (len != skb->len || !cmd->ident) {
5615 BT_DBG("corrupted command");
5616 goto drop;
5617 }
c5623556 5618
203e639e 5619 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5620 if (err) {
5621 struct l2cap_cmd_rej_unk rej;
c5623556 5622
4f3e219d 5623 BT_ERR("Wrong link type (%d)", err);
c5623556 5624
dcf4adbf 5625 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5626 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5627 sizeof(rej), &rej);
c5623556
JH		 5628 }
5629
3b166295 5630drop:
c5623556
JH		 5631 kfree_skb(skb);
5632}
5633
3300d9a9 5634static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5635 struct sk_buff *skb)
1da177e4 5636{
69c4e4e8 5637 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5638 u8 *data = skb->data;
5639 int len = skb->len;
5640 struct l2cap_cmd_hdr cmd;
3300d9a9 5641 int err;
1da177e4
LT		 5642
5643 l2cap_raw_recv(conn, skb);
5644
69c4e4e8 5645 if (hcon->type != ACL_LINK)
3b166295 5646 goto drop;
69c4e4e8 5647
1da177e4 5648 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5649 u16 cmd_len;
1da177e4
LT		 5650 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5651 data += L2CAP_CMD_HDR_SIZE;
5652 len -= L2CAP_CMD_HDR_SIZE;
5653
88219a0f 5654 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5655
2d792818
GP		 5656 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5657 cmd.ident);
1da177e4 5658
88219a0f 5659 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5660 BT_DBG("corrupted command");
5661 break;
5662 }
5663
c5623556 5664 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5665 if (err) {
e2fd318e 5666 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5667
5668 BT_ERR("Wrong link type (%d)", err);
1da177e4 5669
dcf4adbf 5670 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5671 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5672 sizeof(rej), &rej);
1da177e4
LT		 5673 }
5674
88219a0f
AV		 5675 data += cmd_len;
5676 len -= cmd_len;
1da177e4
LT		 5677 }
5678
3b166295 5679drop:
1da177e4
LT		 5680 kfree_skb(skb);
5681}
5682
47d1ec61 5683static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5684{
5685 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5686 int hdr_size;
5687
5688 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5689 hdr_size = L2CAP_EXT_HDR_SIZE;
5690 else
5691 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5692
47d1ec61 5693 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5694 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5695 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5696 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5697
5698 if (our_fcs != rcv_fcs)
7a560e5c 5699 return -EBADMSG;
fcc203c3
GP		 5700 }
5701 return 0;
5702}
5703
6ea00485 5704static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5705{
e31f7633 5706 struct l2cap_ctrl control;
d5392c8f 5707
e31f7633 5708 BT_DBG("chan %p", chan);
d5392c8f 5709
e31f7633
MM		 5710 memset(&control, 0, sizeof(control));
5711 control.sframe = 1;
5712 control.final = 1;
5713 control.reqseq = chan->buffer_seq;
5714 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5715
e2ab4353 5716 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5717 control.super = L2CAP_SUPER_RNR;
5718 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5719 }
5720
e31f7633
MM		 5721 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5722 chan->unacked_frames > 0)
5723 __set_retrans_timer(chan);
d5392c8f 5724
e31f7633 5725 /* Send pending iframes */
525cd185 5726 l2cap_ertm_send(chan);
d5392c8f 5727
e2ab4353 5728 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5729 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5730 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5731 * send it now.
5732 */
5733 control.super = L2CAP_SUPER_RR;
5734 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5735 }
5736}
5737
2d792818
GP		 5738static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5739 struct sk_buff **last_frag)
18778a63 5740{
84084a31
MM		 5741 /* skb->len reflects data in skb as well as all fragments
5742 * skb->data_len reflects only data in fragments
5743 */
5744 if (!skb_has_frag_list(skb))
5745 skb_shinfo(skb)->frag_list = new_frag;
5746
5747 new_frag->next = NULL;
5748
5749 (*last_frag)->next = new_frag;
5750 *last_frag = new_frag;
5751
5752 skb->len += new_frag->len;
5753 skb->data_len += new_frag->len;
5754 skb->truesize += new_frag->truesize;
5755}
5756
4b51dae9
MM		 5757static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5758 struct l2cap_ctrl *control)
84084a31
MM		 5759{
5760 int err = -EINVAL;
18778a63 5761
4b51dae9 5762 switch (control->sar) {
7e0ef6ee 5763 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5764 if (chan->sdu)
5765 break;
18778a63 5766
80b98027 5767 err = chan->ops->recv(chan, skb);
84084a31 5768 break;
18778a63 5769
7e0ef6ee 5770 case L2CAP_SAR_START:
84084a31
MM		 5771 if (chan->sdu)
5772 break;
18778a63 5773
6f61fd47 5774 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5775 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5776
84084a31
MM		 5777 if (chan->sdu_len > chan->imtu) {
5778 err = -EMSGSIZE;
5779 break;
5780 }
1890d36b 5781
84084a31
MM		 5782 if (skb->len >= chan->sdu_len)
5783 break;
18778a63 5784
84084a31
MM		 5785 chan->sdu = skb;
5786 chan->sdu_last_frag = skb;
18778a63 5787
84084a31
MM		 5788 skb = NULL;
5789 err = 0;
18778a63
GP		 5790 break;
5791
7e0ef6ee 5792 case L2CAP_SAR_CONTINUE:
6f61fd47 5793 if (!chan->sdu)
84084a31 5794 break;
18778a63 5795
84084a31
MM		 5796 append_skb_frag(chan->sdu, skb,
5797 &chan->sdu_last_frag);
5798 skb = NULL;
18778a63 5799
84084a31
MM		 5800 if (chan->sdu->len >= chan->sdu_len)
5801 break;
4178ba46 5802
84084a31 5803 err = 0;
18778a63
GP		 5804 break;
5805
7e0ef6ee 5806 case L2CAP_SAR_END:
6f61fd47 5807 if (!chan->sdu)
84084a31 5808 break;
18778a63 5809
84084a31
MM		 5810 append_skb_frag(chan->sdu, skb,
5811 &chan->sdu_last_frag);
5812 skb = NULL;
4178ba46 5813
84084a31
MM		 5814 if (chan->sdu->len != chan->sdu_len)
5815 break;
18778a63 5816
80b98027 5817 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5818
84084a31
MM		 5819 if (!err) {
5820 /* Reassembly complete */
5821 chan->sdu = NULL;
5822 chan->sdu_last_frag = NULL;
5823 chan->sdu_len = 0;
1890d36b 5824 }
18778a63
GP		 5825 break;
5826 }
5827
84084a31
MM		 5828 if (err) {
5829 kfree_skb(skb);
5830 kfree_skb(chan->sdu);
5831 chan->sdu = NULL;
5832 chan->sdu_last_frag = NULL;
5833 chan->sdu_len = 0;
5834 }
18778a63 5835
84084a31 5836 return err;
18778a63
GP		 5837}
5838
32b32735
MM		 5839static int l2cap_resegment(struct l2cap_chan *chan)
5840{
5841 /* Placeholder */
5842 return 0;
5843}
5844
61aa4f5b 5845void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5846{
61aa4f5b 5847 u8 event;
712132eb 5848
61aa4f5b
MM		 5849 if (chan->mode != L2CAP_MODE_ERTM)
5850 return;
712132eb 5851
61aa4f5b 5852 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5853 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5854}
5855
d2a7ac5d
MM		 5856static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5857{
63838725
MM		 5858 int err = 0;
5859 /* Pass sequential frames to l2cap_reassemble_sdu()
5860 * until a gap is encountered.
5861 */
5862
5863 BT_DBG("chan %p", chan);
5864
5865 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5866 struct sk_buff *skb;
5867 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5868 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5869
5870 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5871
5872 if (!skb)
5873 break;
5874
5875 skb_unlink(skb, &chan->srej_q);
5876 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5877 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5878 if (err)
5879 break;
5880 }
5881
5882 if (skb_queue_empty(&chan->srej_q)) {
5883 chan->rx_state = L2CAP_RX_STATE_RECV;
5884 l2cap_send_ack(chan);
5885 }
5886
5887 return err;
d2a7ac5d
MM		 5888}
5889
5890static void l2cap_handle_srej(struct l2cap_chan *chan,
5891 struct l2cap_ctrl *control)
5892{
f80842a8
MM		 5893 struct sk_buff *skb;
5894
5895 BT_DBG("chan %p, control %p", chan, control);
5896
5897 if (control->reqseq == chan->next_tx_seq) {
5898 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5899 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5900 return;
5901 }
5902
5903 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5904
5905 if (skb == NULL) {
5906 BT_DBG("Seq %d not available for retransmission",
5907 control->reqseq);
5908 return;
5909 }
5910
5911 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5912 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5913 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5914 return;
5915 }
5916
5917 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5918
5919 if (control->poll) {
5920 l2cap_pass_to_tx(chan, control);
5921
5922 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5923 l2cap_retransmit(chan, control);
5924 l2cap_ertm_send(chan);
5925
5926 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5927 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5928 chan->srej_save_reqseq = control->reqseq;
5929 }
5930 } else {
5931 l2cap_pass_to_tx_fbit(chan, control);
5932
5933 if (control->final) {
5934 if (chan->srej_save_reqseq != control->reqseq ||
5935 !test_and_clear_bit(CONN_SREJ_ACT,
5936 &chan->conn_state))
5937 l2cap_retransmit(chan, control);
5938 } else {
5939 l2cap_retransmit(chan, control);
5940 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5941 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5942 chan->srej_save_reqseq = control->reqseq;
5943 }
5944 }
5945 }
d2a7ac5d
MM		 5946}
5947
5948static void l2cap_handle_rej(struct l2cap_chan *chan,
5949 struct l2cap_ctrl *control)
5950{
fcd289df
MM		 5951 struct sk_buff *skb;
5952
5953 BT_DBG("chan %p, control %p", chan, control);
5954
5955 if (control->reqseq == chan->next_tx_seq) {
5956 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5957 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5958 return;
5959 }
5960
5961 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5962
5963 if (chan->max_tx && skb &&
5964 bt_cb(skb)->control.retries >= chan->max_tx) {
5965 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5966 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5967 return;
5968 }
5969
5970 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5971
5972 l2cap_pass_to_tx(chan, control);
5973
5974 if (control->final) {
5975 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5976 l2cap_retransmit_all(chan, control);
5977 } else {
5978 l2cap_retransmit_all(chan, control);
5979 l2cap_ertm_send(chan);
5980 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5981 set_bit(CONN_REJ_ACT, &chan->conn_state);
5982 }
d2a7ac5d
MM		 5983}
5984
4b51dae9
MM		 5985static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5986{
5987 BT_DBG("chan %p, txseq %d", chan, txseq);
5988
5989 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5990 chan->expected_tx_seq);
5991
5992 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5993 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5994 chan->tx_win) {
4b51dae9
MM		 5995 /* See notes below regarding "double poll" and
5996 * invalid packets.
5997 */
5998 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5999 BT_DBG("Invalid/Ignore - after SREJ");
6000 return L2CAP_TXSEQ_INVALID_IGNORE;
6001 } else {
6002 BT_DBG("Invalid - in window after SREJ sent");
6003 return L2CAP_TXSEQ_INVALID;
6004 }
6005 }
6006
6007 if (chan->srej_list.head == txseq) {
6008 BT_DBG("Expected SREJ");
6009 return L2CAP_TXSEQ_EXPECTED_SREJ;
6010 }
6011
6012 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6013 BT_DBG("Duplicate SREJ - txseq already stored");
6014 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6015 }
6016
6017 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6018 BT_DBG("Unexpected SREJ - not requested");
6019 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6020 }
6021 }
6022
6023 if (chan->expected_tx_seq == txseq) {
6024 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6025 chan->tx_win) {
6026 BT_DBG("Invalid - txseq outside tx window");
6027 return L2CAP_TXSEQ_INVALID;
6028 } else {
6029 BT_DBG("Expected");
6030 return L2CAP_TXSEQ_EXPECTED;
6031 }
6032 }
6033
6034 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6035 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6036 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6037 return L2CAP_TXSEQ_DUPLICATE;
6038 }
6039
6040 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6041 /* A source of invalid packets is a "double poll" condition,
6042 * where delays cause us to send multiple poll packets. If
6043 * the remote stack receives and processes both polls,
6044 * sequence numbers can wrap around in such a way that a
6045 * resent frame has a sequence number that looks like new data
6046 * with a sequence gap. This would trigger an erroneous SREJ
6047 * request.
6048 *
6049 * Fortunately, this is impossible with a tx window that's
6050 * less than half of the maximum sequence number, which allows
6051 * invalid frames to be safely ignored.
6052 *
6053 * With tx window sizes greater than half of the tx window
6054 * maximum, the frame is invalid and cannot be ignored. This
6055 * causes a disconnect.
6056 */
6057
6058 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6059 BT_DBG("Invalid/Ignore - txseq outside tx window");
6060 return L2CAP_TXSEQ_INVALID_IGNORE;
6061 } else {
6062 BT_DBG("Invalid - txseq outside tx window");
6063 return L2CAP_TXSEQ_INVALID;
6064 }
6065 } else {
6066 BT_DBG("Unexpected - txseq indicates missing frames");
6067 return L2CAP_TXSEQ_UNEXPECTED;
6068 }
6069}
6070
d2a7ac5d
MM		 6071static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6072 struct l2cap_ctrl *control,
6073 struct sk_buff *skb, u8 event)
6074{
6075 int err = 0;
941247f9 6076 bool skb_in_use = false;
d2a7ac5d
MM		 6077
6078 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6079 event);
6080
6081 switch (event) {
6082 case L2CAP_EV_RECV_IFRAME:
6083 switch (l2cap_classify_txseq(chan, control->txseq)) {
6084 case L2CAP_TXSEQ_EXPECTED:
6085 l2cap_pass_to_tx(chan, control);
6086
6087 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6088 BT_DBG("Busy, discarding expected seq %d",
6089 control->txseq);
6090 break;
6091 }
6092
6093 chan->expected_tx_seq = __next_seq(chan,
6094 control->txseq);
6095
6096 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6097 skb_in_use = true;
d2a7ac5d
MM		 6098
6099 err = l2cap_reassemble_sdu(chan, skb, control);
6100 if (err)
6101 break;
6102
6103 if (control->final) {
6104 if (!test_and_clear_bit(CONN_REJ_ACT,
6105 &chan->conn_state)) {
6106 control->final = 0;
6107 l2cap_retransmit_all(chan, control);
6108 l2cap_ertm_send(chan);
6109 }
6110 }
6111
6112 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6113 l2cap_send_ack(chan);
6114 break;
6115 case L2CAP_TXSEQ_UNEXPECTED:
6116 l2cap_pass_to_tx(chan, control);
6117
6118 /* Can't issue SREJ frames in the local busy state.
6119 * Drop this frame, it will be seen as missing
6120 * when local busy is exited.
6121 */
6122 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6123 BT_DBG("Busy, discarding unexpected seq %d",
6124 control->txseq);
6125 break;
6126 }
6127
6128 /* There was a gap in the sequence, so an SREJ
6129 * must be sent for each missing frame. The
6130 * current frame is stored for later use.
6131 */
6132 skb_queue_tail(&chan->srej_q, skb);
941247f9 6133 skb_in_use = true;
d2a7ac5d
MM		 6134 BT_DBG("Queued %p (queue len %d)", skb,
6135 skb_queue_len(&chan->srej_q));
6136
6137 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6138 l2cap_seq_list_clear(&chan->srej_list);
6139 l2cap_send_srej(chan, control->txseq);
6140
6141 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6142 break;
6143 case L2CAP_TXSEQ_DUPLICATE:
6144 l2cap_pass_to_tx(chan, control);
6145 break;
6146 case L2CAP_TXSEQ_INVALID_IGNORE:
6147 break;
6148 case L2CAP_TXSEQ_INVALID:
6149 default:
5e4e3972 6150 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6151 break;
6152 }
6153 break;
6154 case L2CAP_EV_RECV_RR:
6155 l2cap_pass_to_tx(chan, control);
6156 if (control->final) {
6157 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6158
e6a3ee6e
MM		 6159 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6160 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6161 control->final = 0;
6162 l2cap_retransmit_all(chan, control);
6163 }
6164
6165 l2cap_ertm_send(chan);
6166 } else if (control->poll) {
6167 l2cap_send_i_or_rr_or_rnr(chan);
6168 } else {
6169 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6170 &chan->conn_state) &&
6171 chan->unacked_frames)
6172 __set_retrans_timer(chan);
6173
6174 l2cap_ertm_send(chan);
6175 }
6176 break;
6177 case L2CAP_EV_RECV_RNR:
6178 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6179 l2cap_pass_to_tx(chan, control);
6180 if (control && control->poll) {
6181 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6182 l2cap_send_rr_or_rnr(chan, 0);
6183 }
6184 __clear_retrans_timer(chan);
6185 l2cap_seq_list_clear(&chan->retrans_list);
6186 break;
6187 case L2CAP_EV_RECV_REJ:
6188 l2cap_handle_rej(chan, control);
6189 break;
6190 case L2CAP_EV_RECV_SREJ:
6191 l2cap_handle_srej(chan, control);
6192 break;
6193 default:
6194 break;
6195 }
6196
6197 if (skb && !skb_in_use) {
6198 BT_DBG("Freeing %p", skb);
6199 kfree_skb(skb);
6200 }
6201
6202 return err;
6203}
6204
6205static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6206 struct l2cap_ctrl *control,
6207 struct sk_buff *skb, u8 event)
6208{
6209 int err = 0;
6210 u16 txseq = control->txseq;
941247f9 6211 bool skb_in_use = false;
d2a7ac5d
MM		 6212
6213 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6214 event);
6215
6216 switch (event) {
6217 case L2CAP_EV_RECV_IFRAME:
6218 switch (l2cap_classify_txseq(chan, txseq)) {
6219 case L2CAP_TXSEQ_EXPECTED:
6220 /* Keep frame for reassembly later */
6221 l2cap_pass_to_tx(chan, control);
6222 skb_queue_tail(&chan->srej_q, skb);
941247f9 6223 skb_in_use = true;
d2a7ac5d
MM		 6224 BT_DBG("Queued %p (queue len %d)", skb,
6225 skb_queue_len(&chan->srej_q));
6226
6227 chan->expected_tx_seq = __next_seq(chan, txseq);
6228 break;
6229 case L2CAP_TXSEQ_EXPECTED_SREJ:
6230 l2cap_seq_list_pop(&chan->srej_list);
6231
6232 l2cap_pass_to_tx(chan, control);
6233 skb_queue_tail(&chan->srej_q, skb);
941247f9 6234 skb_in_use = true;
d2a7ac5d
MM		 6235 BT_DBG("Queued %p (queue len %d)", skb,
6236 skb_queue_len(&chan->srej_q));
6237
6238 err = l2cap_rx_queued_iframes(chan);
6239 if (err)
6240 break;
6241
6242 break;
6243 case L2CAP_TXSEQ_UNEXPECTED:
6244 /* Got a frame that can't be reassembled yet.
6245 * Save it for later, and send SREJs to cover
6246 * the missing frames.
6247 */
6248 skb_queue_tail(&chan->srej_q, skb);
941247f9 6249 skb_in_use = true;
d2a7ac5d
MM		 6250 BT_DBG("Queued %p (queue len %d)", skb,
6251 skb_queue_len(&chan->srej_q));
6252
6253 l2cap_pass_to_tx(chan, control);
6254 l2cap_send_srej(chan, control->txseq);
6255 break;
6256 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6257 /* This frame was requested with an SREJ, but
6258 * some expected retransmitted frames are
6259 * missing. Request retransmission of missing
6260 * SREJ'd frames.
6261 */
6262 skb_queue_tail(&chan->srej_q, skb);
941247f9 6263 skb_in_use = true;
d2a7ac5d
MM		 6264 BT_DBG("Queued %p (queue len %d)", skb,
6265 skb_queue_len(&chan->srej_q));
6266
6267 l2cap_pass_to_tx(chan, control);
6268 l2cap_send_srej_list(chan, control->txseq);
6269 break;
6270 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6271 /* We've already queued this frame. Drop this copy. */
6272 l2cap_pass_to_tx(chan, control);
6273 break;
6274 case L2CAP_TXSEQ_DUPLICATE:
6275 /* Expecting a later sequence number, so this frame
6276 * was already received. Ignore it completely.
6277 */
6278 break;
6279 case L2CAP_TXSEQ_INVALID_IGNORE:
6280 break;
6281 case L2CAP_TXSEQ_INVALID:
6282 default:
5e4e3972 6283 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6284 break;
6285 }
6286 break;
6287 case L2CAP_EV_RECV_RR:
6288 l2cap_pass_to_tx(chan, control);
6289 if (control->final) {
6290 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6291
6292 if (!test_and_clear_bit(CONN_REJ_ACT,
6293 &chan->conn_state)) {
6294 control->final = 0;
6295 l2cap_retransmit_all(chan, control);
6296 }
6297
6298 l2cap_ertm_send(chan);
6299 } else if (control->poll) {
6300 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6301 &chan->conn_state) &&
6302 chan->unacked_frames) {
6303 __set_retrans_timer(chan);
6304 }
6305
6306 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6307 l2cap_send_srej_tail(chan);
6308 } else {
6309 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6310 &chan->conn_state) &&
6311 chan->unacked_frames)
6312 __set_retrans_timer(chan);
6313
6314 l2cap_send_ack(chan);
6315 }
6316 break;
6317 case L2CAP_EV_RECV_RNR:
6318 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6319 l2cap_pass_to_tx(chan, control);
6320 if (control->poll) {
6321 l2cap_send_srej_tail(chan);
6322 } else {
6323 struct l2cap_ctrl rr_control;
6324 memset(&rr_control, 0, sizeof(rr_control));
6325 rr_control.sframe = 1;
6326 rr_control.super = L2CAP_SUPER_RR;
6327 rr_control.reqseq = chan->buffer_seq;
6328 l2cap_send_sframe(chan, &rr_control);
6329 }
6330
6331 break;
6332 case L2CAP_EV_RECV_REJ:
6333 l2cap_handle_rej(chan, control);
6334 break;
6335 case L2CAP_EV_RECV_SREJ:
6336 l2cap_handle_srej(chan, control);
6337 break;
6338 }
6339
6340 if (skb && !skb_in_use) {
6341 BT_DBG("Freeing %p", skb);
6342 kfree_skb(skb);
6343 }
6344
6345 return err;
6346}
6347
32b32735
MM		 6348static int l2cap_finish_move(struct l2cap_chan *chan)
6349{
6350 BT_DBG("chan %p", chan);
6351
6352 chan->rx_state = L2CAP_RX_STATE_RECV;
6353
6354 if (chan->hs_hcon)
6355 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6356 else
6357 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6358
6359 return l2cap_resegment(chan);
6360}
6361
6362static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6363 struct l2cap_ctrl *control,
6364 struct sk_buff *skb, u8 event)
6365{
6366 int err;
6367
6368 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6369 event);
6370
6371 if (!control->poll)
6372 return -EPROTO;
6373
6374 l2cap_process_reqseq(chan, control->reqseq);
6375
6376 if (!skb_queue_empty(&chan->tx_q))
6377 chan->tx_send_head = skb_peek(&chan->tx_q);
6378 else
6379 chan->tx_send_head = NULL;
6380
6381 /* Rewind next_tx_seq to the point expected
6382 * by the receiver.
6383 */
6384 chan->next_tx_seq = control->reqseq;
6385 chan->unacked_frames = 0;
6386
6387 err = l2cap_finish_move(chan);
6388 if (err)
6389 return err;
6390
6391 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6392 l2cap_send_i_or_rr_or_rnr(chan);
6393
6394 if (event == L2CAP_EV_RECV_IFRAME)
6395 return -EPROTO;
6396
6397 return l2cap_rx_state_recv(chan, control, NULL, event);
6398}
6399
6400static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6401 struct l2cap_ctrl *control,
6402 struct sk_buff *skb, u8 event)
6403{
6404 int err;
6405
6406 if (!control->final)
6407 return -EPROTO;
6408
6409 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6410
6411 chan->rx_state = L2CAP_RX_STATE_RECV;
6412 l2cap_process_reqseq(chan, control->reqseq);
6413
6414 if (!skb_queue_empty(&chan->tx_q))
6415 chan->tx_send_head = skb_peek(&chan->tx_q);
6416 else
6417 chan->tx_send_head = NULL;
6418
6419 /* Rewind next_tx_seq to the point expected
6420 * by the receiver.
6421 */
6422 chan->next_tx_seq = control->reqseq;
6423 chan->unacked_frames = 0;
6424
6425 if (chan->hs_hcon)
6426 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6427 else
6428 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6429
6430 err = l2cap_resegment(chan);
6431
6432 if (!err)
6433 err = l2cap_rx_state_recv(chan, control, skb, event);
6434
6435 return err;
6436}
6437
d2a7ac5d
MM		 6438static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6439{
6440 /* Make sure reqseq is for a packet that has been sent but not acked */
6441 u16 unacked;
6442
6443 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6444 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6445}
6446
cec8ab6e
MM		 6447static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6448 struct sk_buff *skb, u8 event)
218bb9df 6449{
d2a7ac5d
MM		 6450 int err = 0;
6451
6452 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6453 control, skb, event, chan->rx_state);
6454
6455 if (__valid_reqseq(chan, control->reqseq)) {
6456 switch (chan->rx_state) {
6457 case L2CAP_RX_STATE_RECV:
6458 err = l2cap_rx_state_recv(chan, control, skb, event);
6459 break;
6460 case L2CAP_RX_STATE_SREJ_SENT:
6461 err = l2cap_rx_state_srej_sent(chan, control, skb,
6462 event);
6463 break;
32b32735
MM		 6464 case L2CAP_RX_STATE_WAIT_P:
6465 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6466 break;
6467 case L2CAP_RX_STATE_WAIT_F:
6468 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6469 break;
d2a7ac5d
MM		 6470 default:
6471 /* shut it down */
6472 break;
6473 }
6474 } else {
6475 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6476 control->reqseq, chan->next_tx_seq,
6477 chan->expected_ack_seq);
5e4e3972 6478 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6479 }
6480
6481 return err;
cec8ab6e
MM		 6482}
6483
6484static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6485 struct sk_buff *skb)
6486{
4b51dae9
MM		 6487 int err = 0;
6488
6489 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6490 chan->rx_state);
6491
6492 if (l2cap_classify_txseq(chan, control->txseq) ==
6493 L2CAP_TXSEQ_EXPECTED) {
6494 l2cap_pass_to_tx(chan, control);
6495
6496 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6497 __next_seq(chan, chan->buffer_seq));
6498
6499 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6500
6501 l2cap_reassemble_sdu(chan, skb, control);
6502 } else {
6503 if (chan->sdu) {
6504 kfree_skb(chan->sdu);
6505 chan->sdu = NULL;
6506 }
6507 chan->sdu_last_frag = NULL;
6508 chan->sdu_len = 0;
6509
6510 if (skb) {
6511 BT_DBG("Freeing %p", skb);
6512 kfree_skb(skb);
6513 }
6514 }
6515
6516 chan->last_acked_seq = control->txseq;
6517 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6518
6519 return err;
cec8ab6e
MM		 6520}
6521
6522static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6523{
6524 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6525 u16 len;
6526 u8 event;
218bb9df 6527
b76bbd66
MM		 6528 __unpack_control(chan, skb);
6529
218bb9df
GP		 6530 len = skb->len;
6531
6532 /*
6533 * We can just drop the corrupted I-frame here.
6534 * Receiver will miss it and start proper recovery
cec8ab6e 6535 * procedures and ask for retransmission.
218bb9df 6536 */
47d1ec61 6537 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6538 goto drop;
6539
cec8ab6e 6540 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6541 len -= L2CAP_SDULEN_SIZE;
218bb9df 6542
47d1ec61 6543 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6544 len -= L2CAP_FCS_SIZE;
218bb9df 6545
47d1ec61 6546 if (len > chan->mps) {
5e4e3972 6547 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6548 goto drop;
6549 }
6550
cec8ab6e
MM		 6551 if (!control->sframe) {
6552 int err;
218bb9df 6553
cec8ab6e
MM		 6554 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6555 control->sar, control->reqseq, control->final,
6556 control->txseq);
218bb9df 6557
cec8ab6e
MM		 6558 /* Validate F-bit - F=0 always valid, F=1 only
6559 * valid in TX WAIT_F
6560 */
6561 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6562 goto drop;
cec8ab6e
MM		 6563
6564 if (chan->mode != L2CAP_MODE_STREAMING) {
6565 event = L2CAP_EV_RECV_IFRAME;
6566 err = l2cap_rx(chan, control, skb, event);
6567 } else {
6568 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6569 }
6570
cec8ab6e 6571 if (err)
5e4e3972 6572 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6573 } else {
cec8ab6e
MM		 6574 const u8 rx_func_to_event[4] = {
6575 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6576 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6577 };
6578
6579 /* Only I-frames are expected in streaming mode */
6580 if (chan->mode == L2CAP_MODE_STREAMING)
6581 goto drop;
6582
6583 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6584 control->reqseq, control->final, control->poll,
6585 control->super);
6586
218bb9df 6587 if (len != 0) {
1bb166e6 6588 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6589 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6590 goto drop;
6591 }
6592
cec8ab6e
MM		 6593 /* Validate F and P bits */
6594 if (control->final && (control->poll ||
6595 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6596 goto drop;
6597
6598 event = rx_func_to_event[control->super];
6599 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6600 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6601 }
6602
6603 return 0;
6604
6605drop:
6606 kfree_skb(skb);
6607 return 0;
6608}
6609
b1c325c2
JH		 6610static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6611{
6612 struct l2cap_conn *conn = chan->conn;
6613 struct l2cap_le_credits pkt;
6614 u16 return_credits;
6615
6616 /* We return more credits to the sender only after the amount of
6617 * credits falls below half of the initial amount.
6618 */
f15b8ecf 6619 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6620 return;
6621
f15b8ecf 6622 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6623
6624 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6625
6626 chan->rx_credits += return_credits;
6627
6628 pkt.cid = cpu_to_le16(chan->scid);
6629 pkt.credits = cpu_to_le16(return_credits);
6630
6631 chan->ident = l2cap_get_ident(conn);
6632
6633 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6634}
6635
fad5fc89
JH		 6636static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6637{
aac23bf6
JH		 6638 int err;
6639
6640 if (!chan->rx_credits) {
6641 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6642 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6643 return -ENOBUFS;
aac23bf6 6644 }
fad5fc89 6645
aac23bf6
JH		 6646 if (chan->imtu < skb->len) {
6647 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6648 return -ENOBUFS;
aac23bf6 6649 }
fad5fc89
JH		 6650
6651 chan->rx_credits--;
6652 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6653
6654 l2cap_chan_le_send_credits(chan);
6655
aac23bf6
JH		 6656 err = 0;
6657
6658 if (!chan->sdu) {
6659 u16 sdu_len;
6660
6661 sdu_len = get_unaligned_le16(skb->data);
6662 skb_pull(skb, L2CAP_SDULEN_SIZE);
6663
6664 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6665 sdu_len, skb->len, chan->imtu);
6666
6667 if (sdu_len > chan->imtu) {
6668 BT_ERR("Too big LE L2CAP SDU length received");
6669 err = -EMSGSIZE;
6670 goto failed;
6671 }
6672
6673 if (skb->len > sdu_len) {
6674 BT_ERR("Too much LE L2CAP data received");
6675 err = -EINVAL;
6676 goto failed;
6677 }
6678
6679 if (skb->len == sdu_len)
6680 return chan->ops->recv(chan, skb);
6681
6682 chan->sdu = skb;
6683 chan->sdu_len = sdu_len;
6684 chan->sdu_last_frag = skb;
6685
6686 return 0;
6687 }
6688
6689 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6690 chan->sdu->len, skb->len, chan->sdu_len);
6691
6692 if (chan->sdu->len + skb->len > chan->sdu_len) {
6693 BT_ERR("Too much LE L2CAP data received");
6694 err = -EINVAL;
6695 goto failed;
6696 }
6697
6698 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6699 skb = NULL;
6700
6701 if (chan->sdu->len == chan->sdu_len) {
6702 err = chan->ops->recv(chan, chan->sdu);
6703 if (!err) {
6704 chan->sdu = NULL;
6705 chan->sdu_last_frag = NULL;
6706 chan->sdu_len = 0;
6707 }
6708 }
6709
6710failed:
6711 if (err) {
6712 kfree_skb(skb);
6713 kfree_skb(chan->sdu);
6714 chan->sdu = NULL;
6715 chan->sdu_last_frag = NULL;
6716 chan->sdu_len = 0;
6717 }
6718
6719 /* We can't return an error here since we took care of the skb
6720 * freeing internally. An error return would cause the caller to
6721 * do a double-free of the skb.
6722 */
6723 return 0;
fad5fc89
JH		 6724}
6725
13ca56e0
AE		 6726static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6727 struct sk_buff *skb)
1da177e4 6728{
48454079 6729 struct l2cap_chan *chan;
1da177e4 6730
baa7e1fa 6731 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6732 if (!chan) {
97e8e89d
AE		 6733 if (cid == L2CAP_CID_A2MP) {
6734 chan = a2mp_channel_create(conn, skb);
6735 if (!chan) {
6736 kfree_skb(skb);
13ca56e0 6737 return;
97e8e89d
AE		 6738 }
6739
6740 l2cap_chan_lock(chan);
6741 } else {
6742 BT_DBG("unknown cid 0x%4.4x", cid);
6743 /* Drop packet and return */
6744 kfree_skb(skb);
13ca56e0 6745 return;
97e8e89d 6746 }
1da177e4
LT		 6747 }
6748
49208c9c 6749 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6750
89bc500e 6751 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6752 goto drop;
6753
0c1bc5c6 6754 switch (chan->mode) {
38319713 6755 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6756 if (l2cap_le_data_rcv(chan, skb) < 0)
6757 goto drop;
6758
6759 goto done;
6760
1c2acffb
GP		 6761 case L2CAP_MODE_BASIC:
6762 /* If socket recv buffers overflows we drop data here
6763 * which is *bad* because L2CAP has to be reliable.
6764 * But we don't have any other choice. L2CAP doesn't
6765 * provide flow control mechanism. */
1da177e4 6766
2c96e03d
SJ		 6767 if (chan->imtu < skb->len) {
6768 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6769 goto drop;
2c96e03d 6770 }
1da177e4 6771
80b98027 6772 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6773 goto done;
6774 break;
6775
6776 case L2CAP_MODE_ERTM:
6840ed07 6777 case L2CAP_MODE_STREAMING:
cec8ab6e 6778 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6779 goto done;
6780
1c2acffb 6781 default:
0c1bc5c6 6782 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6783 break;
6784 }
1da177e4
LT		 6785
6786drop:
6787 kfree_skb(skb);
6788
6789done:
6be36555 6790 l2cap_chan_unlock(chan);
1da177e4
LT		 6791}
6792
84104b24
AE		 6793static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6794 struct sk_buff *skb)
1da177e4 6795{
ae4fd2d3 6796 struct hci_conn *hcon = conn->hcon;
23691d75 6797 struct l2cap_chan *chan;
1da177e4 6798
ae4fd2d3 6799 if (hcon->type != ACL_LINK)
a24cce14 6800 goto free_skb;
ae4fd2d3 6801
bf20fd4e
JH		 6802 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6803 ACL_LINK);
23691d75 6804 if (!chan)
a24cce14 6805 goto free_skb;
1da177e4 6806
5b4cedaa 6807 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6808
89bc500e 6809 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6810 goto drop;
6811
e13e21dc 6812 if (chan->imtu < skb->len)
1da177e4
LT		 6813 goto drop;
6814
2edf870d 6815 /* Store remote BD_ADDR and PSM for msg_name */
06ae3314 6816 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
2edf870d
MH		 6817 bt_cb(skb)->psm = psm;
6818
a24cce14
JH		 6819 if (!chan->ops->recv(chan, skb)) {
6820 l2cap_chan_put(chan);
84104b24 6821 return;
a24cce14 6822 }
1da177e4
LT		 6823
6824drop:
a24cce14
JH		 6825 l2cap_chan_put(chan);
6826free_skb:
1da177e4 6827 kfree_skb(skb);
1da177e4
LT		 6828}
6829
6830static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6831{
6832 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6833 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6834 u16 cid, len;
6835 __le16 psm;
1da177e4 6836
61a939c6
JH		 6837 if (hcon->state != BT_CONNECTED) {
6838 BT_DBG("queueing pending rx skb");
6839 skb_queue_tail(&conn->pending_rx, skb);
6840 return;
6841 }
6842
1da177e4
LT		 6843 skb_pull(skb, L2CAP_HDR_SIZE);
6844 cid = __le16_to_cpu(lh->cid);
6845 len = __le16_to_cpu(lh->len);
6846
1c2acffb
GP		 6847 if (len != skb->len) {
6848 kfree_skb(skb);
6849 return;
6850 }
6851
9e1d7e15
JH		 6852 /* Since we can't actively block incoming LE connections we must
6853 * at least ensure that we ignore incoming data from them.
6854 */
6855 if (hcon->type == LE_LINK &&
dcc36c16
JH		 6856 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
6857 bdaddr_type(hcon, hcon->dst_type))) {
e493150e
JH		 6858 kfree_skb(skb);
6859 return;
6860 }
6861
1da177e4
LT		 6862 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6863
6864 switch (cid) {
8db4dc46 6865 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6866 l2cap_sig_channel(conn, skb);
6867 break;
6868
8db4dc46 6869 case L2CAP_CID_CONN_LESS:
097db76c 6870 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6871 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6872 l2cap_conless_channel(conn, psm, skb);
6873 break;
6874
a2877629
MH		 6875 case L2CAP_CID_LE_SIGNALING:
6876 l2cap_le_sig_channel(conn, skb);
6877 break;
6878
1da177e4
LT		 6879 default:
6880 l2cap_data_channel(conn, cid, skb);
6881 break;
6882 }
6883}
6884
61a939c6
JH		 6885static void process_pending_rx(struct work_struct *work)
6886{
6887 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6888 pending_rx_work);
6889 struct sk_buff *skb;
6890
6891 BT_DBG("");
6892
6893 while ((skb = skb_dequeue(&conn->pending_rx)))
6894 l2cap_recv_frame(conn, skb);
6895}
6896
162b49e7
JH		 6897static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6898{
6899 struct l2cap_conn *conn = hcon->l2cap_data;
6900 struct hci_chan *hchan;
6901
6902 if (conn)
6903 return conn;
6904
6905 hchan = hci_chan_create(hcon);
6906 if (!hchan)
6907 return NULL;
6908
27f70f3e 6909 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
162b49e7
JH		 6910 if (!conn) {
6911 hci_chan_del(hchan);
6912 return NULL;
6913 }
6914
6915 kref_init(&conn->ref);
6916 hcon->l2cap_data = conn;
51bb8457 6917 conn->hcon = hci_conn_get(hcon);
162b49e7
JH		 6918 conn->hchan = hchan;
6919
6920 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6921
6922 switch (hcon->type) {
6923 case LE_LINK:
6924 if (hcon->hdev->le_mtu) {
6925 conn->mtu = hcon->hdev->le_mtu;
6926 break;
6927 }
6928 /* fall through */
6929 default:
6930 conn->mtu = hcon->hdev->acl_mtu;
6931 break;
6932 }
6933
6934 conn->feat_mask = 0;
6935
6936 if (hcon->type == ACL_LINK)
6937 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
6938 &hcon->hdev->dev_flags);
6939
5a54e7c8 6940 mutex_init(&conn->ident_lock);
162b49e7
JH		 6941 mutex_init(&conn->chan_lock);
6942
6943 INIT_LIST_HEAD(&conn->chan_l);
6944 INIT_LIST_HEAD(&conn->users);
6945
276d8073 6946 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
162b49e7 6947
61a939c6
JH		 6948 skb_queue_head_init(&conn->pending_rx);
6949 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
f3d82d0c 6950 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
61a939c6 6951
162b49e7
JH		 6952 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
6953
6954 return conn;
6955}
6956
6957static bool is_valid_psm(u16 psm, u8 dst_type) {
6958 if (!psm)
6959 return false;
6960
6961 if (bdaddr_type_is_le(dst_type))
6962 return (psm <= 0x00ff);
6963
6964 /* PSM must be odd and lsb of upper byte must be 0 */
6965 return ((psm & 0x0101) == 0x0001);
6966}
6967
6968int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
6969 bdaddr_t *dst, u8 dst_type)
6970{
6971 struct l2cap_conn *conn;
6972 struct hci_conn *hcon;
6973 struct hci_dev *hdev;
162b49e7
JH		 6974 int err;
6975
6976 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
6977 dst_type, __le16_to_cpu(psm));
6978
6979 hdev = hci_get_route(dst, &chan->src);
6980 if (!hdev)
6981 return -EHOSTUNREACH;
6982
6983 hci_dev_lock(hdev);
6984
162b49e7
JH		 6985 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
6986 chan->chan_type != L2CAP_CHAN_RAW) {
6987 err = -EINVAL;
6988 goto done;
6989 }
6990
21626e62
JH		 6991 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
6992 err = -EINVAL;
6993 goto done;
6994 }
6995
6996 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 6997 err = -EINVAL;
6998 goto done;
6999 }
7000
7001 switch (chan->mode) {
7002 case L2CAP_MODE_BASIC:
7003 break;
7004 case L2CAP_MODE_LE_FLOWCTL:
7005 l2cap_le_flowctl_init(chan);
7006 break;
7007 case L2CAP_MODE_ERTM:
7008 case L2CAP_MODE_STREAMING:
7009 if (!disable_ertm)
7010 break;
7011 /* fall through */
7012 default:
beb19e4c 7013 err = -EOPNOTSUPP;
162b49e7
JH		 7014 goto done;
7015 }
7016
7017 switch (chan->state) {
7018 case BT_CONNECT:
7019 case BT_CONNECT2:
7020 case BT_CONFIG:
7021 /* Already connecting */
7022 err = 0;
7023 goto done;
7024
7025 case BT_CONNECTED:
7026 /* Already connected */
7027 err = -EISCONN;
7028 goto done;
7029
7030 case BT_OPEN:
7031 case BT_BOUND:
7032 /* Can connect */
7033 break;
7034
7035 default:
7036 err = -EBADFD;
7037 goto done;
7038 }
7039
7040 /* Set destination address and psm */
7041 bacpy(&chan->dst, dst);
7042 chan->dst_type = dst_type;
7043
7044 chan->psm = psm;
7045 chan->dcid = cid;
7046
6f77d8c7 7047 if (bdaddr_type_is_le(dst_type)) {
e804d25d 7048 u8 role;
cdd6275e 7049
6f77d8c7
AG		 7050 /* Convert from L2CAP channel address type to HCI address type
7051 */
7052 if (dst_type == BDADDR_LE_PUBLIC)
7053 dst_type = ADDR_LE_DEV_PUBLIC;
7054 else
7055 dst_type = ADDR_LE_DEV_RANDOM;
7056
e804d25d
JH		 7057 if (test_bit(HCI_ADVERTISING, &hdev->dev_flags))
7058 role = HCI_ROLE_SLAVE;
7059 else
7060 role = HCI_ROLE_MASTER;
cdd6275e 7061
04a6c589 7062 hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level,
e804d25d 7063 HCI_LE_CONN_TIMEOUT, role);
6f77d8c7 7064 } else {
d93375a8 7065 u8 auth_type = l2cap_get_auth_type(chan);
04a6c589 7066 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7067 }
162b49e7
JH		 7068
7069 if (IS_ERR(hcon)) {
7070 err = PTR_ERR(hcon);
7071 goto done;
7072 }
7073
7074 conn = l2cap_conn_add(hcon);
7075 if (!conn) {
7076 hci_conn_drop(hcon);
7077 err = -ENOMEM;
7078 goto done;
7079 }
7080
02e246ae
JH		 7081 mutex_lock(&conn->chan_lock);
7082 l2cap_chan_lock(chan);
7083
162b49e7
JH		 7084 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7085 hci_conn_drop(hcon);
7086 err = -EBUSY;
02e246ae 7087 goto chan_unlock;
162b49e7
JH		 7088 }
7089
7090 /* Update source addr of the socket */
7091 bacpy(&chan->src, &hcon->src);
7092 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7093
02e246ae 7094 __l2cap_chan_add(conn, chan);
162b49e7
JH		 7095
7096 /* l2cap_chan_add takes its own ref so we can drop this one */
7097 hci_conn_drop(hcon);
7098
7099 l2cap_state_change(chan, BT_CONNECT);
7100 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7101
61202e4d
JH		 7102 /* Release chan->sport so that it can be reused by other
7103 * sockets (as it's only used for listening sockets).
7104 */
7105 write_lock(&chan_list_lock);
7106 chan->sport = 0;
7107 write_unlock(&chan_list_lock);
7108
162b49e7
JH		 7109 if (hcon->state == BT_CONNECTED) {
7110 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7111 __clear_chan_timer(chan);
e7cafc45 7112 if (l2cap_chan_check_security(chan, true))
162b49e7
JH		 7113 l2cap_state_change(chan, BT_CONNECTED);
7114 } else
7115 l2cap_do_start(chan);
7116 }
7117
7118 err = 0;
7119
02e246ae 7120chan_unlock:
162b49e7 7121 l2cap_chan_unlock(chan);
02e246ae
JH		 7122 mutex_unlock(&conn->chan_lock);
7123done:
162b49e7
JH		 7124 hci_dev_unlock(hdev);
7125 hci_dev_put(hdev);
7126 return err;
7127}
6b8d4a6a 7128EXPORT_SYMBOL_GPL(l2cap_chan_connect);
162b49e7 7129
1da177e4
LT		 7130/* ---- L2CAP interface with lower layer (HCI) ---- */
7131
686ebf28 7132int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7133{
7134 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7135 struct l2cap_chan *c;
1da177e4 7136
6ed93dc6 7137 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7138
7139 /* Find listening sockets and check their link_mode */
23691d75
GP		 7140 read_lock(&chan_list_lock);
7141 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7142 if (c->state != BT_LISTEN)
1da177e4
LT		 7143 continue;
7144
7eafc59e 7145 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7146 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7147 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7148 lm1 |= HCI_LM_MASTER;
1da177e4 7149 exact++;
7eafc59e 7150 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7151 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7152 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7153 lm2 |= HCI_LM_MASTER;
7154 }
1da177e4 7155 }
23691d75 7156 read_unlock(&chan_list_lock);
1da177e4
LT		 7157
7158 return exact ? lm1 : lm2;
7159}
7160
e760ec12
JH		 7161/* Find the next fixed channel in BT_LISTEN state, continue iteration
7162 * from an existing channel in the list or from the beginning of the
7163 * global list (by passing NULL as first parameter).
7164 */
7165static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
54a1b626 7166 bdaddr_t *src, u8 link_type)
e760ec12
JH		 7167{
7168 read_lock(&chan_list_lock);
7169
7170 if (c)
7171 c = list_next_entry(c, global_l);
7172 else
7173 c = list_entry(chan_list.next, typeof(*c), global_l);
7174
7175 list_for_each_entry_from(c, &chan_list, global_l) {
7176 if (c->chan_type != L2CAP_CHAN_FIXED)
7177 continue;
7178 if (c->state != BT_LISTEN)
7179 continue;
7180 if (bacmp(&c->src, src) && bacmp(&c->src, BDADDR_ANY))
7181 continue;
54a1b626
JH		 7182 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
7183 continue;
7184 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
7185 continue;
e760ec12
JH		 7186
7187 l2cap_chan_hold(c);
7188 read_unlock(&chan_list_lock);
7189 return c;
7190 }
7191
7192 read_unlock(&chan_list_lock);
7193
7194 return NULL;
7195}
7196
9e664631 7197void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7198{
e760ec12 7199 struct hci_dev *hdev = hcon->hdev;
0139418c 7200 struct l2cap_conn *conn;
e760ec12
JH		 7201 struct l2cap_chan *pchan;
7202 u8 dst_type;
0139418c 7203
6ed93dc6 7204 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7205
dc0f5088 7206 if (status) {
e175072f 7207 l2cap_conn_del(hcon, bt_to_errno(status));
dc0f5088 7208 return;
ba6fc317 7209 }
dc0f5088
JH		 7210
7211 conn = l2cap_conn_add(hcon);
7212 if (!conn)
7213 return;
7214
e760ec12
JH		 7215 dst_type = bdaddr_type(hcon, hcon->dst_type);
7216
7217 /* If device is blocked, do not create channels for it */
7218 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7219 return;
7220
7221 /* Find fixed channels and notify them of the new connection. We
7222 * use multiple individual lookups, continuing each time where
7223 * we left off, because the list lock would prevent calling the
7224 * potentially sleeping l2cap_chan_lock() function.
7225 */
54a1b626 7226 pchan = l2cap_global_fixed_chan(NULL, &hdev->bdaddr, hcon->type);
e760ec12
JH		 7227 while (pchan) {
7228 struct l2cap_chan *chan, *next;
7229
7230 /* Client fixed channels should override server ones */
7231 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7232 goto next;
7233
7234 l2cap_chan_lock(pchan);
7235 chan = pchan->ops->new_connection(pchan);
7236 if (chan) {
7237 bacpy(&chan->src, &hcon->src);
7238 bacpy(&chan->dst, &hcon->dst);
7239 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7240 chan->dst_type = dst_type;
7241
7242 __l2cap_chan_add(conn, chan);
7243 }
7244
7245 l2cap_chan_unlock(pchan);
7246next:
54a1b626
JH		 7247 next = l2cap_global_fixed_chan(pchan, &hdev->bdaddr,
7248 hcon->type);
e760ec12
JH		 7249 l2cap_chan_put(pchan);
7250 pchan = next;
7251 }
7252
dc0f5088 7253 l2cap_conn_ready(conn);
1da177e4
LT		 7254}
7255
686ebf28 7256int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7257{
7258 struct l2cap_conn *conn = hcon->l2cap_data;
7259
7260 BT_DBG("hcon %p", hcon);
7261
686ebf28 7262 if (!conn)
9f5a0d7b 7263 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7264 return conn->disc_reason;
7265}
7266
9e664631 7267void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 7268{
7269 BT_DBG("hcon %p reason %d", hcon, reason);
7270
e175072f 7271 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7272}
7273
4343478f 7274static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7275{
715ec005 7276 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7277 return;
7278
f62e4323 7279 if (encrypt == 0x00) {
4343478f 7280 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7281 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7282 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7283 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7284 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7285 } else {
4343478f 7286 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7287 __clear_chan_timer(chan);
f62e4323
MH		 7288 }
7289}
7290
686ebf28 7291int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7292{
0139418c 7293 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7294 struct l2cap_chan *chan;
1da177e4 7295
0139418c 7296 if (!conn)
1da177e4 7297 return 0;
0139418c 7298
89d8b407 7299 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7300
3df91ea2 7301 mutex_lock(&conn->chan_lock);
1da177e4 7302
3df91ea2 7303 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7304 l2cap_chan_lock(chan);
1da177e4 7305
89d8b407
AE		 7306 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7307 state_to_string(chan->state));
f1cb9af5 7308
2338a7e0 7309 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7310 l2cap_chan_unlock(chan);
7311 continue;
7312 }
7313
191eb398
JH		 7314 if (!status && encrypt)
7315 chan->sec_level = hcon->sec_level;
f1cb9af5 7316
96eff46e 7317 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7318 l2cap_chan_unlock(chan);
6a8d3010
MH		 7319 continue;
7320 }
7321
89bc500e 7322 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7323 chan->state == BT_CONFIG)) {
d97c899b 7324 chan->ops->resume(chan);
4343478f 7325 l2cap_check_encryption(chan, encrypt);
6be36555 7326 l2cap_chan_unlock(chan);
9719f8af
MH		 7327 continue;
7328 }
7329
89bc500e 7330 if (chan->state == BT_CONNECT) {
6d3c15da 7331 if (!status)
93c3e8f5 7332 l2cap_start_connection(chan);
6d3c15da 7333 else
ba13ccd9 7334 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
89bc500e 7335 } else if (chan->state == BT_CONNECT2) {
b1235d79 7336 struct l2cap_conn_rsp rsp;
df3c3931 7337 __u16 res, stat;
1da177e4 7338
b1235d79 7339 if (!status) {
bdc25783 7340 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7341 res = L2CAP_CR_PEND;
7342 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7343 chan->ops->defer(chan);
df3c3931 7344 } else {
acdcabf5 7345 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7346 res = L2CAP_CR_SUCCESS;
7347 stat = L2CAP_CS_NO_INFO;
7348 }
b1235d79 7349 } else {
acdcabf5 7350 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7351 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7352 res = L2CAP_CR_SEC_BLOCK;
7353 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7354 }
7355
fe4128e0
GP		 7356 rsp.scid = cpu_to_le16(chan->dcid);
7357 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7358 rsp.result = cpu_to_le16(res);
7359 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7360 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7361 sizeof(rsp), &rsp);
2d369359
MM		 7362
7363 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7364 res == L2CAP_CR_SUCCESS) {
7365 char buf[128];
7366 set_bit(CONF_REQ_SENT, &chan->conf_state);
7367 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7368 L2CAP_CONF_REQ,
7369 l2cap_build_conf_req(chan, buf),
7370 buf);
7371 chan->num_conf_req++;
7372 }
b1235d79 7373 }
1da177e4 7374
6be36555 7375 l2cap_chan_unlock(chan);
1da177e4
LT		 7376 }
7377
3df91ea2 7378 mutex_unlock(&conn->chan_lock);
b1235d79 7379
1da177e4
LT		 7380 return 0;
7381}
7382
686ebf28 7383int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7384{
7385 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7386 struct l2cap_hdr *hdr;
7387 int len;
1da177e4 7388
1d13a254
AE		 7389 /* For AMP controller do not create l2cap conn */
7390 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7391 goto drop;
1da177e4 7392
5a08ecce 7393 if (!conn)
baf43251 7394 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7395
7396 if (!conn)
1da177e4
LT		 7397 goto drop;
7398
7399 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7400
d73a0988
AE		 7401 switch (flags) {
7402 case ACL_START:
7403 case ACL_START_NO_FLUSH:
7404 case ACL_COMPLETE:
1da177e4
LT		 7405 if (conn->rx_len) {
7406 BT_ERR("Unexpected start frame (len %d)", skb->len);
7407 kfree_skb(conn->rx_skb);
7408 conn->rx_skb = NULL;
7409 conn->rx_len = 0;
7410 l2cap_conn_unreliable(conn, ECOMM);
7411 }
7412
aae7fe22
AE		 7413 /* Start fragment always begin with Basic L2CAP header */
7414 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7415 BT_ERR("Frame is too short (len %d)", skb->len);
7416 l2cap_conn_unreliable(conn, ECOMM);
7417 goto drop;
7418 }
7419
7420 hdr = (struct l2cap_hdr *) skb->data;
7421 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7422
7423 if (len == skb->len) {
7424 /* Complete frame received */
7425 l2cap_recv_frame(conn, skb);
7426 return 0;
7427 }
7428
7429 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7430
7431 if (skb->len > len) {
7432 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7433 skb->len, len);
1da177e4
LT		 7434 l2cap_conn_unreliable(conn, ECOMM);
7435 goto drop;
7436 }
7437
7438 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7439 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7440 if (!conn->rx_skb)
1da177e4
LT		 7441 goto drop;
7442
d626f62b 7443 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7444 skb->len);
1da177e4 7445 conn->rx_len = len - skb->len;
d73a0988
AE		 7446 break;
7447
7448 case ACL_CONT:
1da177e4
LT		 7449 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7450
7451 if (!conn->rx_len) {
7452 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7453 l2cap_conn_unreliable(conn, ECOMM);
7454 goto drop;
7455 }
7456
7457 if (skb->len > conn->rx_len) {
7458 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7459 skb->len, conn->rx_len);
1da177e4
LT		 7460 kfree_skb(conn->rx_skb);
7461 conn->rx_skb = NULL;
7462 conn->rx_len = 0;
7463 l2cap_conn_unreliable(conn, ECOMM);
7464 goto drop;
7465 }
7466
d626f62b 7467 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7468 skb->len);
1da177e4
LT		 7469 conn->rx_len -= skb->len;
7470
7471 if (!conn->rx_len) {
c4e5bafa
JH		 7472 /* Complete frame received. l2cap_recv_frame
7473 * takes ownership of the skb so set the global
7474 * rx_skb pointer to NULL first.
7475 */
7476 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7477 conn->rx_skb = NULL;
c4e5bafa 7478 l2cap_recv_frame(conn, rx_skb);
1da177e4 7479 }
d73a0988 7480 break;
1da177e4
LT		 7481 }
7482
7483drop:
7484 kfree_skb(skb);
7485 return 0;
7486}
7487
aef7d97c 7488static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7489{
23691d75 7490 struct l2cap_chan *c;
1da177e4 7491
333055f2 7492 read_lock(&chan_list_lock);
1da177e4 7493
23691d75 7494 list_for_each_entry(c, &chan_list, global_l) {
fcb73338 7495 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7eafc59e 7496 &c->src, &c->dst,
fcb73338
AE		 7497 c->state, __le16_to_cpu(c->psm),
7498 c->scid, c->dcid, c->imtu, c->omtu,
7499 c->sec_level, c->mode);
61e1b4b7 7500 }
1da177e4 7501
333055f2 7502 read_unlock(&chan_list_lock);
1da177e4 7503
aef7d97c 7504 return 0;
1da177e4
LT		 7505}
7506
aef7d97c
MH		 7507static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7508{
7509 return single_open(file, l2cap_debugfs_show, inode->i_private);
7510}
7511
7512static const struct file_operations l2cap_debugfs_fops = {
7513 .open = l2cap_debugfs_open,
7514 .read = seq_read,
7515 .llseek = seq_lseek,
7516 .release = single_release,
7517};
7518
7519static struct dentry *l2cap_debugfs;
1da177e4 7520
64274518 7521int __init l2cap_init(void)
1da177e4
LT		 7522{
7523 int err;
be9d1227 7524
bb58f747 7525 err = l2cap_init_sockets();
1da177e4
LT		 7526 if (err < 0)
7527 return err;
7528
1120e4bf
MH		 7529 if (IS_ERR_OR_NULL(bt_debugfs))
7530 return 0;
7531
7532 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7533 NULL, &l2cap_debugfs_fops);
1da177e4 7534
40b9397a 7535 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
f15b8ecf 7536 &le_max_credits);
40b9397a 7537 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
f15b8ecf
JH		 7538 &le_default_mps);
7539
1da177e4 7540 return 0;
1da177e4
LT		 7541}
7542
64274518 7543void l2cap_exit(void)
1da177e4 7544{
aef7d97c 7545 debugfs_remove(l2cap_debugfs);
bb58f747 7546 l2cap_cleanup_sockets();
1da177e4
LT		 7547}
7548
d1c4a17d
GP		 7549module_param(disable_ertm, bool, 0644);
7550MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
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