]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - net/bluetooth/l2cap_core.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
UBUNTU: [Config] CONFIG_SND_SOC_ES8316=m
[mirror_ubuntu-artful-kernel.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>
dbb50887 35#include <linux/filter.h>
1da177e4
LT		 36
37#include <net/bluetooth/bluetooth.h>
38#include <net/bluetooth/hci_core.h>
39#include <net/bluetooth/l2cap.h>
7ef9fbf0 40
ac4b7236 41#include "smp.h"
7024728e 42#include "a2mp.h"
7ef9fbf0 43#include "amp.h"
1da177e4 44
0f1bfe4e
JH		 45#define LE_FLOWCTL_MAX_CREDITS 65535
46
d1de6d46 47bool disable_ertm;
f0709e03 48
547d1032 49static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
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);
8cb091c6 61static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data, size_t data_size);
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
a250e048 67static inline u8 bdaddr_type(u8 link_type, u8 bdaddr_type)
4f1654e0 68{
a250e048
JH		 69 if (link_type == LE_LINK) {
70 if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
4f1654e0
MH		 71 return BDADDR_LE_PUBLIC;
72 else
73 return BDADDR_LE_RANDOM;
74 }
75
76 return BDADDR_BREDR;
77}
78
a250e048
JH		 79static inline u8 bdaddr_src_type(struct hci_conn *hcon)
80{
81 return bdaddr_type(hcon->type, hcon->src_type);
82}
83
84static inline u8 bdaddr_dst_type(struct hci_conn *hcon)
85{
86 return bdaddr_type(hcon->type, hcon->dst_type);
87}
88
0139418c 89/* ---- L2CAP channels ---- */
71ba0e56 90
2d792818
GP		 91static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
92 u16 cid)
0139418c 93{
3df91ea2 94 struct l2cap_chan *c;
3d57dc68 95
3df91ea2
AE		 96 list_for_each_entry(c, &conn->chan_l, list) {
97 if (c->dcid == cid)
98 return c;
0139418c 99 }
3df91ea2 100 return NULL;
0139418c
MH		 101}
102
2d792818
GP		 103static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
104 u16 cid)
0139418c 105{
3df91ea2 106 struct l2cap_chan *c;
3d57dc68 107
3df91ea2
AE		 108 list_for_each_entry(c, &conn->chan_l, list) {
109 if (c->scid == cid)
110 return c;
0139418c 111 }
3df91ea2 112 return NULL;
0139418c
MH		 113}
114
115/* Find channel with given SCID.
ef191ade 116 * Returns locked channel. */
2d792818
GP		 117static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
118 u16 cid)
0139418c 119{
48454079 120 struct l2cap_chan *c;
baa7e1fa 121
3df91ea2 122 mutex_lock(&conn->chan_lock);
baa7e1fa 123 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 124 if (c)
125 l2cap_chan_lock(c);
3df91ea2
AE		 126 mutex_unlock(&conn->chan_lock);
127
48454079 128 return c;
0139418c
MH		 129}
130
b1a130b7
MM		 131/* Find channel with given DCID.
132 * Returns locked channel.
133 */
134static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
135 u16 cid)
136{
137 struct l2cap_chan *c;
138
139 mutex_lock(&conn->chan_lock);
140 c = __l2cap_get_chan_by_dcid(conn, cid);
141 if (c)
142 l2cap_chan_lock(c);
143 mutex_unlock(&conn->chan_lock);
144
145 return c;
146}
147
2d792818
GP		 148static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
149 u8 ident)
0139418c 150{
3df91ea2 151 struct l2cap_chan *c;
3d57dc68 152
3df91ea2
AE		 153 list_for_each_entry(c, &conn->chan_l, list) {
154 if (c->ident == ident)
155 return c;
0139418c 156 }
3df91ea2 157 return NULL;
0139418c
MH		 158}
159
5b155ef9
MM		 160static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
161 u8 ident)
162{
163 struct l2cap_chan *c;
164
165 mutex_lock(&conn->chan_lock);
166 c = __l2cap_get_chan_by_ident(conn, ident);
167 if (c)
168 l2cap_chan_lock(c);
169 mutex_unlock(&conn->chan_lock);
170
171 return c;
172}
173
23691d75 174static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 175{
23691d75 176 struct l2cap_chan *c;
9e4425ff 177
23691d75 178 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 179 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 180 return c;
9e4425ff 181 }
250938cb 182 return NULL;
9e4425ff
GP		 183}
184
185int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
186{
73b2ec18
GP		 187 int err;
188
333055f2 189 write_lock(&chan_list_lock);
9e4425ff 190
23691d75 191 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 192 err = -EADDRINUSE;
193 goto done;
9e4425ff
GP		 194 }
195
73b2ec18
GP		 196 if (psm) {
197 chan->psm = psm;
198 chan->sport = psm;
199 err = 0;
200 } else {
92594a51
JH		 201 u16 p, start, end, incr;
202
203 if (chan->src_type == BDADDR_BREDR) {
204 start = L2CAP_PSM_DYN_START;
205 end = L2CAP_PSM_AUTO_END;
206 incr = 2;
207 } else {
208 start = L2CAP_PSM_LE_DYN_START;
209 end = L2CAP_PSM_LE_DYN_END;
210 incr = 1;
211 }
73b2ec18
GP		 212
213 err = -EINVAL;
92594a51 214 for (p = start; p <= end; p += incr)
23691d75 215 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 216 chan->psm = cpu_to_le16(p);
217 chan->sport = cpu_to_le16(p);
218 err = 0;
219 break;
220 }
221 }
9e4425ff 222
73b2ec18 223done:
333055f2 224 write_unlock(&chan_list_lock);
73b2ec18 225 return err;
9e4425ff 226}
6b8d4a6a 227EXPORT_SYMBOL_GPL(l2cap_add_psm);
9e4425ff
GP		 228
229int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
230{
333055f2 231 write_lock(&chan_list_lock);
9e4425ff 232
14824308
JH		 233 /* Override the defaults (which are for conn-oriented) */
234 chan->omtu = L2CAP_DEFAULT_MTU;
235 chan->chan_type = L2CAP_CHAN_FIXED;
236
9e4425ff
GP		 237 chan->scid = scid;
238
333055f2 239 write_unlock(&chan_list_lock);
9e4425ff
GP		 240
241 return 0;
242}
243
baa7e1fa 244static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 245{
e77af755 246 u16 cid, dyn_end;
0139418c 247
e77af755
JH		 248 if (conn->hcon->type == LE_LINK)
249 dyn_end = L2CAP_CID_LE_DYN_END;
250 else
251 dyn_end = L2CAP_CID_DYN_END;
252
ab0c127f 253 for (cid = L2CAP_CID_DYN_START; cid <= dyn_end; cid++) {
baa7e1fa 254 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 255 return cid;
256 }
257
258 return 0;
259}
260
f93fa273 261static void l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 262{
42d2d87c 263 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 264 state_to_string(state));
badaaa00 265
89bc500e 266 chan->state = state;
53f52121 267 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 268}
269
f8e73017
GP		 270static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
271 int state, int err)
2e0052e4 272{
f8e73017 273 chan->state = state;
53f52121 274 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 275}
276
277static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
278{
f8e73017 279 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 280}
281
4239d16f
MM		 282static void __set_retrans_timer(struct l2cap_chan *chan)
283{
284 if (!delayed_work_pending(&chan->monitor_timer) &&
285 chan->retrans_timeout) {
286 l2cap_set_timer(chan, &chan->retrans_timer,
287 msecs_to_jiffies(chan->retrans_timeout));
288 }
289}
290
291static void __set_monitor_timer(struct l2cap_chan *chan)
292{
293 __clear_retrans_timer(chan);
294 if (chan->monitor_timeout) {
295 l2cap_set_timer(chan, &chan->monitor_timer,
296 msecs_to_jiffies(chan->monitor_timeout));
297 }
298}
299
608bcc6d
MM		 300static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
301 u16 seq)
302{
303 struct sk_buff *skb;
304
305 skb_queue_walk(head, skb) {
a4368ff3 306 if (bt_cb(skb)->l2cap.txseq == seq)
608bcc6d
MM		 307 return skb;
308 }
309
310 return NULL;
311}
312
3c588192
MM		 313/* ---- L2CAP sequence number lists ---- */
314
315/* For ERTM, ordered lists of sequence numbers must be tracked for
316 * SREJ requests that are received and for frames that are to be
317 * retransmitted. These seq_list functions implement a singly-linked
318 * list in an array, where membership in the list can also be checked
319 * in constant time. Items can also be added to the tail of the list
320 * and removed from the head in constant time, without further memory
321 * allocs or frees.
322 */
323
324static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
325{
326 size_t alloc_size, i;
327
328 /* Allocated size is a power of 2 to map sequence numbers
329 * (which may be up to 14 bits) in to a smaller array that is
330 * sized for the negotiated ERTM transmit windows.
331 */
332 alloc_size = roundup_pow_of_two(size);
333
334 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
335 if (!seq_list->list)
336 return -ENOMEM;
337
338 seq_list->mask = alloc_size - 1;
339 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
340 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
341 for (i = 0; i < alloc_size; i++)
342 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
343
344 return 0;
345}
346
347static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
348{
349 kfree(seq_list->list);
350}
351
352static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
353 u16 seq)
354{
355 /* Constant-time check for list membership */
356 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
357}
358
03a0c5d6 359static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
3c588192 360{
03a0c5d6 361 u16 seq = seq_list->head;
3c588192
MM		 362 u16 mask = seq_list->mask;
363
03a0c5d6
JH		 364 seq_list->head = seq_list->list[seq & mask];
365 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
366
367 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
368 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
369 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192 370 }
3c588192 371
03a0c5d6 372 return seq;
3c588192
MM		 373}
374
375static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
376{
f522ae36 377 u16 i;
3c588192 378
f522ae36
GP		 379 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
380 return;
381
382 for (i = 0; i <= seq_list->mask; i++)
383 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
384
385 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
386 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 387}
388
389static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
390{
391 u16 mask = seq_list->mask;
392
393 /* All appends happen in constant time */
394
f522ae36
GP		 395 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
396 return;
3c588192 397
f522ae36
GP		 398 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
399 seq_list->head = seq;
400 else
401 seq_list->list[seq_list->tail & mask] = seq;
402
403 seq_list->tail = seq;
404 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 405}
406
721c4181 407static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 408{
721c4181 409 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 410 chan_timer.work);
3df91ea2 411 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 412 int reason;
413
e05dcc32 414 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 415
3df91ea2 416 mutex_lock(&conn->chan_lock);
6be36555 417 l2cap_chan_lock(chan);
ab07801d 418
89bc500e 419 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 420 reason = ECONNREFUSED;
89bc500e 421 else if (chan->state == BT_CONNECT &&
2d792818 422 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 423 reason = ECONNREFUSED;
424 else
425 reason = ETIMEDOUT;
426
0f852724 427 l2cap_chan_close(chan, reason);
ab07801d 428
6be36555 429 l2cap_chan_unlock(chan);
ab07801d 430
80b98027 431 chan->ops->close(chan);
3df91ea2
AE		 432 mutex_unlock(&conn->chan_lock);
433
371fd835 434 l2cap_chan_put(chan);
ab07801d
GP		 435}
436
eef1d9b6 437struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 438{
439 struct l2cap_chan *chan;
440
441 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
442 if (!chan)
443 return NULL;
444
c03b355e
AE		 445 mutex_init(&chan->lock);
446
ff714119
JH		 447 /* Set default lock nesting level */
448 atomic_set(&chan->nesting, L2CAP_NESTING_NORMAL);
449
333055f2 450 write_lock(&chan_list_lock);
23691d75 451 list_add(&chan->global_l, &chan_list);
333055f2 452 write_unlock(&chan_list_lock);
23691d75 453
721c4181 454 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 455
89bc500e
GP		 456 chan->state = BT_OPEN;
457
144ad330 458 kref_init(&chan->kref);
71ba0e56 459
2827011f
MM		 460 /* This flag is cleared in l2cap_chan_ready() */
461 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
462
eef1d9b6 463 BT_DBG("chan %p", chan);
abc545b8 464
48454079
GP		 465 return chan;
466}
6b8d4a6a 467EXPORT_SYMBOL_GPL(l2cap_chan_create);
48454079 468
144ad330 469static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 470{
144ad330
SS		 471 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
472
4af66c69
JK		 473 BT_DBG("chan %p", chan);
474
333055f2 475 write_lock(&chan_list_lock);
23691d75 476 list_del(&chan->global_l);
333055f2 477 write_unlock(&chan_list_lock);
23691d75 478
4af66c69 479 kfree(chan);
6ff5abbf
GP		 480}
481
30648372
JK		 482void l2cap_chan_hold(struct l2cap_chan *c)
483{
2c935bc5 484 BT_DBG("chan %p orig refcnt %d", c, kref_read(&c->kref));
30648372 485
144ad330 486 kref_get(&c->kref);
30648372
JK		 487}
488
489void l2cap_chan_put(struct l2cap_chan *c)
490{
2c935bc5 491 BT_DBG("chan %p orig refcnt %d", c, kref_read(&c->kref));
30648372 492
144ad330 493 kref_put(&c->kref, l2cap_chan_destroy);
30648372 494}
6b8d4a6a 495EXPORT_SYMBOL_GPL(l2cap_chan_put);
30648372 496
bd4b1653
AE		 497void l2cap_chan_set_defaults(struct l2cap_chan *chan)
498{
499 chan->fcs = L2CAP_FCS_CRC16;
500 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
501 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
502 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
6a5e8165
JR		 503 chan->remote_max_tx = chan->max_tx;
504 chan->remote_tx_win = chan->tx_win;
c20f8e35 505 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653 506 chan->sec_level = BT_SECURITY_LOW;
6a5e8165
JR		 507 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
508 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
509 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
510 chan->conf_state = 0;
bd4b1653
AE		 511
512 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
513}
6b8d4a6a 514EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
bd4b1653 515
0ce43ce6 516static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 517{
0ce43ce6
JH		 518 chan->sdu = NULL;
519 chan->sdu_last_frag = NULL;
520 chan->sdu_len = 0;
0cd75f7e 521 chan->tx_credits = 0;
f15b8ecf 522 chan->rx_credits = le_max_credits;
d1d79413 523 chan->mps = min_t(u16, chan->imtu, le_default_mps);
0ce43ce6
JH		 524
525 skb_queue_head_init(&chan->tx_q);
38319713
JH		 526}
527
93c3e8f5 528void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 529{
af05b30b 530 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 531 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 532
9f5a0d7b 533 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 534
8c1d787b 535 chan->conn = conn;
0139418c 536
5491120e
AE		 537 switch (chan->chan_type) {
538 case L2CAP_CHAN_CONN_ORIENTED:
21626e62
JH		 539 /* Alloc CID for connection-oriented socket */
540 chan->scid = l2cap_alloc_cid(conn);
541 if (conn->hcon->type == ACL_LINK)
0c1bc5c6 542 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 543 break;
544
545 case L2CAP_CHAN_CONN_LESS:
0139418c 546 /* Connectionless socket */
fe4128e0
GP		 547 chan->scid = L2CAP_CID_CONN_LESS;
548 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 549 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 550 break;
551
2338a7e0
JH		 552 case L2CAP_CHAN_FIXED:
553 /* Caller will set CID and CID specific MTU values */
416fa752
AE		 554 break;
555
5491120e 556 default:
0139418c 557 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 558 chan->scid = L2CAP_CID_SIGNALING;
559 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 560 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 561 }
562
8f7975b1
AE		 563 chan->local_id = L2CAP_BESTEFFORT_ID;
564 chan->local_stype = L2CAP_SERV_BESTEFFORT;
565 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
566 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
567 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 568 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 569
371fd835 570 l2cap_chan_hold(chan);
baa7e1fa 571
c16900cf
JH		 572 /* Only keep a reference for fixed channels if they requested it */
573 if (chan->chan_type != L2CAP_CHAN_FIXED ||
574 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
575 hci_conn_hold(conn->hcon);
5ee9891d 576
3df91ea2 577 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 578}
579
466f8004 580void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 581{
582 mutex_lock(&conn->chan_lock);
583 __l2cap_chan_add(conn, chan);
3df91ea2 584 mutex_unlock(&conn->chan_lock);
0139418c
MH		 585}
586
466f8004 587void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 588{
8c1d787b 589 struct l2cap_conn *conn = chan->conn;
0139418c 590
c9b66675 591 __clear_chan_timer(chan);
0139418c 592
49d11741
JH		 593 BT_DBG("chan %p, conn %p, err %d, state %s", chan, conn, err,
594 state_to_string(chan->state));
0139418c 595
72847ce0
JH		 596 chan->ops->teardown(chan, err);
597
8e87d142 598 if (conn) {
56f60984 599 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 600 /* Delete from channel list */
3df91ea2 601 list_del(&chan->list);
3d57dc68 602
371fd835 603 l2cap_chan_put(chan);
baa7e1fa 604
8c1d787b 605 chan->conn = NULL;
3cabbfda 606
c16900cf
JH		 607 /* Reference was only held for non-fixed channels or
608 * fixed channels that explicitly requested it using the
609 * FLAG_HOLD_HCI_CONN flag.
610 */
611 if (chan->chan_type != L2CAP_CHAN_FIXED ||
612 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
76a68ba0 613 hci_conn_drop(conn->hcon);
56f60984
AE		 614
615 if (mgr && mgr->bredr_chan == chan)
616 mgr->bredr_chan = NULL;
0139418c
MH		 617 }
618
419e08c1
AE		 619 if (chan->hs_hchan) {
620 struct hci_chan *hs_hchan = chan->hs_hchan;
621
622 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
623 amp_disconnect_logical_link(hs_hchan);
624 }
625
2827011f 626 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 627 return;
2ead70b8 628
ee556f66
GP		 629 switch(chan->mode) {
630 case L2CAP_MODE_BASIC:
631 break;
c13ffa62 632
38319713 633 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 634 skb_queue_purge(&chan->tx_q);
38319713
JH		 635 break;
636
ee556f66 637 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 638 __clear_retrans_timer(chan);
639 __clear_monitor_timer(chan);
640 __clear_ack_timer(chan);
c13ffa62 641
f1c6775b 642 skb_queue_purge(&chan->srej_q);
c13ffa62 643
3c588192
MM		 644 l2cap_seq_list_free(&chan->srej_list);
645 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 646
647 /* fall through */
648
649 case L2CAP_MODE_STREAMING:
650 skb_queue_purge(&chan->tx_q);
651 break;
c13ffa62 652 }
ee556f66
GP		 653
654 return;
0139418c 655}
6b8d4a6a 656EXPORT_SYMBOL_GPL(l2cap_chan_del);
0139418c 657
f3d82d0c 658static void l2cap_conn_update_id_addr(struct work_struct *work)
387a33e3 659{
f3d82d0c
JH		 660 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
661 id_addr_update_work);
662 struct hci_conn *hcon = conn->hcon;
387a33e3
JH		 663 struct l2cap_chan *chan;
664
665 mutex_lock(&conn->chan_lock);
666
667 list_for_each_entry(chan, &conn->chan_l, list) {
668 l2cap_chan_lock(chan);
669 bacpy(&chan->dst, &hcon->dst);
a250e048 670 chan->dst_type = bdaddr_dst_type(hcon);
387a33e3
JH		 671 l2cap_chan_unlock(chan);
672 }
673
674 mutex_unlock(&conn->chan_lock);
675}
676
27e2d4c8
JH		 677static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
678{
679 struct l2cap_conn *conn = chan->conn;
680 struct l2cap_le_conn_rsp rsp;
681 u16 result;
682
683 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
684 result = L2CAP_CR_AUTHORIZATION;
685 else
686 result = L2CAP_CR_BAD_PSM;
687
688 l2cap_state_change(chan, BT_DISCONN);
689
690 rsp.dcid = cpu_to_le16(chan->scid);
691 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 692 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 693 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 694 rsp.result = cpu_to_le16(result);
695
696 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
697 &rsp);
698}
699
791d60f7
JH		 700static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
701{
702 struct l2cap_conn *conn = chan->conn;
703 struct l2cap_conn_rsp rsp;
704 u16 result;
705
706 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
707 result = L2CAP_CR_SEC_BLOCK;
708 else
709 result = L2CAP_CR_BAD_PSM;
710
711 l2cap_state_change(chan, BT_DISCONN);
712
713 rsp.scid = cpu_to_le16(chan->dcid);
714 rsp.dcid = cpu_to_le16(chan->scid);
715 rsp.result = cpu_to_le16(result);
dcf4adbf 716 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
791d60f7
JH		 717
718 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
719}
720
0f852724 721void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 722{
723 struct l2cap_conn *conn = chan->conn;
4519de9a 724
7eafc59e 725 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 726
89bc500e 727 switch (chan->state) {
4519de9a 728 case BT_LISTEN:
b699ec0d 729 chan->ops->teardown(chan, 0);
4519de9a
GP		 730 break;
731
732 case BT_CONNECTED:
733 case BT_CONFIG:
7b25c9b3 734 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
8d836d71 735 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 736 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 737 } else
738 l2cap_chan_del(chan, reason);
739 break;
740
741 case BT_CONNECT2:
791d60f7
JH		 742 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
743 if (conn->hcon->type == ACL_LINK)
744 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 745 else if (conn->hcon->type == LE_LINK)
746 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 747 }
748
749 l2cap_chan_del(chan, reason);
750 break;
751
752 case BT_CONNECT:
753 case BT_DISCONN:
754 l2cap_chan_del(chan, reason);
755 break;
756
757 default:
b699ec0d 758 chan->ops->teardown(chan, 0);
4519de9a
GP		 759 break;
760 }
761}
6b8d4a6a 762EXPORT_SYMBOL(l2cap_chan_close);
4519de9a 763
4343478f 764static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 765{
6a974b50
MH		 766 switch (chan->chan_type) {
767 case L2CAP_CHAN_RAW:
4343478f 768 switch (chan->sec_level) {
8556edd3 769 case BT_SECURITY_HIGH:
7d513e92 770 case BT_SECURITY_FIPS:
8556edd3
JH		 771 return HCI_AT_DEDICATED_BONDING_MITM;
772 case BT_SECURITY_MEDIUM:
773 return HCI_AT_DEDICATED_BONDING;
774 default:
775 return HCI_AT_NO_BONDING;
776 }
6a974b50 777 break;
3124b843 778 case L2CAP_CHAN_CONN_LESS:
dcf4adbf 779 if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) {
3124b843
MH		 780 if (chan->sec_level == BT_SECURITY_LOW)
781 chan->sec_level = BT_SECURITY_SDP;
782 }
7d513e92
MH		 783 if (chan->sec_level == BT_SECURITY_HIGH ||
784 chan->sec_level == BT_SECURITY_FIPS)
3124b843
MH		 785 return HCI_AT_NO_BONDING_MITM;
786 else
787 return HCI_AT_NO_BONDING;
788 break;
6a974b50 789 case L2CAP_CHAN_CONN_ORIENTED:
dcf4adbf 790 if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) {
6a974b50
MH		 791 if (chan->sec_level == BT_SECURITY_LOW)
792 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 793
7d513e92
MH		 794 if (chan->sec_level == BT_SECURITY_HIGH ||
795 chan->sec_level == BT_SECURITY_FIPS)
6a974b50
MH		 796 return HCI_AT_NO_BONDING_MITM;
797 else
798 return HCI_AT_NO_BONDING;
799 }
800 /* fall through */
801 default:
4343478f 802 switch (chan->sec_level) {
00ae4af9 803 case BT_SECURITY_HIGH:
7d513e92 804 case BT_SECURITY_FIPS:
8556edd3 805 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 806 case BT_SECURITY_MEDIUM:
8556edd3 807 return HCI_AT_GENERAL_BONDING;
00ae4af9 808 default:
8556edd3 809 return HCI_AT_NO_BONDING;
00ae4af9 810 }
6a974b50 811 break;
0684e5f9 812 }
8556edd3
JH		 813}
814
815/* Service level security */
e7cafc45 816int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator)
8556edd3 817{
8c1d787b 818 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 819 __u8 auth_type;
820
a17de2fe
JH		 821 if (conn->hcon->type == LE_LINK)
822 return smp_conn_security(conn->hcon, chan->sec_level);
823
4343478f 824 auth_type = l2cap_get_auth_type(chan);
79d554a6 825
e7cafc45
JH		 826 return hci_conn_security(conn->hcon, chan->sec_level, auth_type,
827 initiator);
79d554a6
MH		 828}
829
b5ad8b7f 830static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 831{
832 u8 id;
833
834 /* Get next available identificator.
835 * 1 - 128 are used by kernel.
836 * 129 - 199 are reserved.
837 * 200 - 254 are used by utilities like l2ping, etc.
838 */
839
5a54e7c8 840 mutex_lock(&conn->ident_lock);
4e8402a3
MH		 841
842 if (++conn->tx_ident > 128)
843 conn->tx_ident = 1;
844
845 id = conn->tx_ident;
846
5a54e7c8 847 mutex_unlock(&conn->ident_lock);
4e8402a3
MH		 848
849 return id;
850}
851
2d792818
GP		 852static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
853 void *data)
4e8402a3
MH		 854{
855 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 856 u8 flags;
4e8402a3
MH		 857
858 BT_DBG("code 0x%2.2x", code);
859
860 if (!skb)
9a9c6a34 861 return;
4e8402a3 862
f6af675e
SW		 863 /* Use NO_FLUSH if supported or we have an LE link (which does
864 * not support auto-flushing packets) */
865 if (lmp_no_flush_capable(conn->hcon->hdev) ||
866 conn->hcon->type == LE_LINK)
e702112f
AE		 867 flags = ACL_START_NO_FLUSH;
868 else
869 flags = ACL_START;
870
14b12d0b 871 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 872 skb->priority = HCI_PRIO_MAX;
14b12d0b 873
73d80deb
LAD		 874 hci_send_acl(conn->hchan, skb, flags);
875}
876
02b0fbb9
MM		 877static bool __chan_is_moving(struct l2cap_chan *chan)
878{
879 return chan->move_state != L2CAP_MOVE_STABLE &&
880 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
881}
882
73d80deb
LAD		 883static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
884{
885 struct hci_conn *hcon = chan->conn->hcon;
886 u16 flags;
887
888 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 889 skb->priority);
73d80deb 890
d5f8a75d
MM		 891 if (chan->hs_hcon && !__chan_is_moving(chan)) {
892 if (chan->hs_hchan)
893 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
894 else
895 kfree_skb(skb);
896
897 return;
898 }
899
f6af675e
SW		 900 /* Use NO_FLUSH for LE links (where this is the only option) or
901 * if the BR/EDR link supports it and flushing has not been
902 * explicitly requested (through FLAG_FLUSHABLE).
903 */
904 if (hcon->type == LE_LINK ||
905 (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
906 lmp_no_flush_capable(hcon->hdev)))
73d80deb
LAD		 907 flags = ACL_START_NO_FLUSH;
908 else
909 flags = ACL_START;
14b12d0b 910
73d80deb
LAD		 911 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
912 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 913}
914
b76bbd66
MM		 915static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
916{
917 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
918 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
919
920 if (enh & L2CAP_CTRL_FRAME_TYPE) {
921 /* S-Frame */
922 control->sframe = 1;
923 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
924 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
925
926 control->sar = 0;
927 control->txseq = 0;
928 } else {
929 /* I-Frame */
930 control->sframe = 0;
931 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
932 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
933
934 control->poll = 0;
935 control->super = 0;
936 }
937}
938
b76bbd66
MM		 939static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
940{
941 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
942 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
943
944 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
945 /* S-Frame */
946 control->sframe = 1;
947 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
948 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
949
950 control->sar = 0;
951 control->txseq = 0;
952 } else {
953 /* I-Frame */
954 control->sframe = 0;
955 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
956 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
957
958 control->poll = 0;
959 control->super = 0;
960 }
961}
962
963static inline void __unpack_control(struct l2cap_chan *chan,
964 struct sk_buff *skb)
965{
966 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
967 __unpack_extended_control(get_unaligned_le32(skb->data),
a4368ff3 968 &bt_cb(skb)->l2cap);
cec8ab6e 969 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 970 } else {
971 __unpack_enhanced_control(get_unaligned_le16(skb->data),
a4368ff3 972 &bt_cb(skb)->l2cap);
cec8ab6e 973 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 974 }
975}
976
b5c6aaed
MM		 977static u32 __pack_extended_control(struct l2cap_ctrl *control)
978{
979 u32 packed;
980
981 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
982 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
983
984 if (control->sframe) {
985 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
986 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
987 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
988 } else {
989 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
990 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
991 }
992
993 return packed;
994}
995
996static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
997{
998 u16 packed;
999
1000 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
1001 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
1002
1003 if (control->sframe) {
1004 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
1005 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
1006 packed |= L2CAP_CTRL_FRAME_TYPE;
1007 } else {
1008 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
1009 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
1010 }
1011
1012 return packed;
1013}
1014
b76bbd66
MM		 1015static inline void __pack_control(struct l2cap_chan *chan,
1016 struct l2cap_ctrl *control,
1017 struct sk_buff *skb)
1018{
1019 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1020 put_unaligned_le32(__pack_extended_control(control),
1021 skb->data + L2CAP_HDR_SIZE);
1022 } else {
1023 put_unaligned_le16(__pack_enhanced_control(control),
1024 skb->data + L2CAP_HDR_SIZE);
1025 }
1026}
1027
ba7aa64f
GP		 1028static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
1029{
1030 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1031 return L2CAP_EXT_HDR_SIZE;
1032 else
1033 return L2CAP_ENH_HDR_SIZE;
1034}
1035
a67d7f6f
MM		 1036static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
1037 u32 control)
b5c6aaed
MM		 1038{
1039 struct sk_buff *skb;
1040 struct l2cap_hdr *lh;
ba7aa64f 1041 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 1042
1043 if (chan->fcs == L2CAP_FCS_CRC16)
1044 hlen += L2CAP_FCS_SIZE;
1045
a67d7f6f 1046 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 1047
b5c6aaed 1048 if (!skb)
a67d7f6f 1049 return ERR_PTR(-ENOMEM);
b5c6aaed 1050
4df864c1 1051 lh = skb_put(skb, L2CAP_HDR_SIZE);
b5c6aaed
MM		 1052 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1053 lh->cid = cpu_to_le16(chan->dcid);
1054
a67d7f6f
MM		 1055 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1056 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1057 else
1058 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 1059
1060 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 1061 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 1062 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1063 }
1064
1065 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 1066 return skb;
1067}
1068
1069static void l2cap_send_sframe(struct l2cap_chan *chan,
1070 struct l2cap_ctrl *control)
1071{
1072 struct sk_buff *skb;
1073 u32 control_field;
1074
1075 BT_DBG("chan %p, control %p", chan, control);
1076
1077 if (!control->sframe)
1078 return;
1079
b99e13ad
MM		 1080 if (__chan_is_moving(chan))
1081 return;
1082
a67d7f6f
MM		 1083 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1084 !control->poll)
1085 control->final = 1;
1086
1087 if (control->super == L2CAP_SUPER_RR)
1088 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1089 else if (control->super == L2CAP_SUPER_RNR)
1090 set_bit(CONN_RNR_SENT, &chan->conn_state);
1091
1092 if (control->super != L2CAP_SUPER_SREJ) {
1093 chan->last_acked_seq = control->reqseq;
1094 __clear_ack_timer(chan);
1095 }
1096
1097 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1098 control->final, control->poll, control->super);
1099
1100 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1101 control_field = __pack_extended_control(control);
1102 else
1103 control_field = __pack_enhanced_control(control);
1104
1105 skb = l2cap_create_sframe_pdu(chan, control_field);
1106 if (!IS_ERR(skb))
1107 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1108}
1109
c9e3d5e0 1110static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1111{
c9e3d5e0
MM		 1112 struct l2cap_ctrl control;
1113
1114 BT_DBG("chan %p, poll %d", chan, poll);
1115
1116 memset(&control, 0, sizeof(control));
1117 control.sframe = 1;
1118 control.poll = poll;
1119
1120 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1121 control.super = L2CAP_SUPER_RNR;
1122 else
1123 control.super = L2CAP_SUPER_RR;
b5c6aaed 1124
c9e3d5e0
MM		 1125 control.reqseq = chan->buffer_seq;
1126 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1127}
1128
b4450035 1129static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1130{
5ff6f34d
JH		 1131 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
1132 return true;
1133
c1360a1c 1134 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1135}
1136
1df7b17a 1137static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1138{
1df7b17a 1139 struct l2cap_conn *conn = chan->conn;
80d58d0b 1140 struct hci_dev *hdev;
1df7b17a
MH		 1141 bool amp_available = false;
1142
0bd49fc7 1143 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
1df7b17a
MH		 1144 return false;
1145
0bd49fc7 1146 if (!(conn->remote_fixed_chan & L2CAP_FC_A2MP))
1df7b17a 1147 return false;
80d58d0b
MH		 1148
1149 read_lock(&hci_dev_list_lock);
1df7b17a 1150 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1151 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1152 test_bit(HCI_UP, &hdev->flags)) {
1153 amp_available = true;
1154 break;
1155 }
1156 }
80d58d0b
MH		 1157 read_unlock(&hci_dev_list_lock);
1158
1df7b17a
MH		 1159 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1160 return amp_available;
848566b3
MH		 1161
1162 return false;
93c3e8f5
AE		 1163}
1164
5ce66b59
AE		 1165static bool l2cap_check_efs(struct l2cap_chan *chan)
1166{
1167 /* Check EFS parameters */
1168 return true;
1169}
1170
2766be48 1171void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1172{
1173 struct l2cap_conn *conn = chan->conn;
1174 struct l2cap_conn_req req;
1175
1176 req.scid = cpu_to_le16(chan->scid);
1177 req.psm = chan->psm;
1178
1179 chan->ident = l2cap_get_ident(conn);
1180
1181 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1182
1183 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1184}
1185
8eb200bd
MM		 1186static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1187{
1188 struct l2cap_create_chan_req req;
1189 req.scid = cpu_to_le16(chan->scid);
1190 req.psm = chan->psm;
1191 req.amp_id = amp_id;
1192
1193 chan->ident = l2cap_get_ident(chan->conn);
1194
1195 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1196 sizeof(req), &req);
1197}
1198
02b0fbb9
MM		 1199static void l2cap_move_setup(struct l2cap_chan *chan)
1200{
1201 struct sk_buff *skb;
1202
1203 BT_DBG("chan %p", chan);
1204
1205 if (chan->mode != L2CAP_MODE_ERTM)
1206 return;
1207
1208 __clear_retrans_timer(chan);
1209 __clear_monitor_timer(chan);
1210 __clear_ack_timer(chan);
1211
1212 chan->retry_count = 0;
1213 skb_queue_walk(&chan->tx_q, skb) {
a4368ff3
JH		 1214 if (bt_cb(skb)->l2cap.retries)
1215 bt_cb(skb)->l2cap.retries = 1;
02b0fbb9
MM		 1216 else
1217 break;
1218 }
1219
1220 chan->expected_tx_seq = chan->buffer_seq;
1221
1222 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1223 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1224 l2cap_seq_list_clear(&chan->retrans_list);
1225 l2cap_seq_list_clear(&chan->srej_list);
1226 skb_queue_purge(&chan->srej_q);
1227
1228 chan->tx_state = L2CAP_TX_STATE_XMIT;
1229 chan->rx_state = L2CAP_RX_STATE_MOVE;
1230
1231 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1232}
1233
5f3847a4
MM		 1234static void l2cap_move_done(struct l2cap_chan *chan)
1235{
1236 u8 move_role = chan->move_role;
1237 BT_DBG("chan %p", chan);
1238
1239 chan->move_state = L2CAP_MOVE_STABLE;
1240 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1241
1242 if (chan->mode != L2CAP_MODE_ERTM)
1243 return;
1244
1245 switch (move_role) {
1246 case L2CAP_MOVE_ROLE_INITIATOR:
1247 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1248 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1249 break;
1250 case L2CAP_MOVE_ROLE_RESPONDER:
1251 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1252 break;
1253 }
1254}
1255
9f0caeb1
VCG		 1256static void l2cap_chan_ready(struct l2cap_chan *chan)
1257{
315917e0
JH		 1258 /* The channel may have already been flagged as connected in
1259 * case of receiving data before the L2CAP info req/rsp
1260 * procedure is complete.
1261 */
1262 if (chan->state == BT_CONNECTED)
1263 return;
1264
2827011f 1265 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1266 chan->conf_state = 0;
1267 __clear_chan_timer(chan);
1268
0ce43ce6
JH		 1269 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1270 chan->ops->suspend(chan);
177f8f2b 1271
54a59aa2 1272 chan->state = BT_CONNECTED;
9f0caeb1 1273
fd83e2c2 1274 chan->ops->ready(chan);
9f0caeb1
VCG		 1275}
1276
f1496dee
JH		 1277static void l2cap_le_connect(struct l2cap_chan *chan)
1278{
1279 struct l2cap_conn *conn = chan->conn;
1280 struct l2cap_le_conn_req req;
1281
595177f3
JH		 1282 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1283 return;
1284
f1496dee
JH		 1285 req.psm = chan->psm;
1286 req.scid = cpu_to_le16(chan->scid);
1287 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1288 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1289 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1290
1291 chan->ident = l2cap_get_ident(conn);
1292
1293 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1294 sizeof(req), &req);
1295}
1296
1297static void l2cap_le_start(struct l2cap_chan *chan)
1298{
1299 struct l2cap_conn *conn = chan->conn;
1300
1301 if (!smp_conn_security(conn->hcon, chan->sec_level))
1302 return;
1303
1304 if (!chan->psm) {
1305 l2cap_chan_ready(chan);
1306 return;
1307 }
1308
1309 if (chan->state == BT_CONNECT)
1310 l2cap_le_connect(chan);
1311}
1312
93c3e8f5
AE		 1313static void l2cap_start_connection(struct l2cap_chan *chan)
1314{
1315 if (__amp_capable(chan)) {
1316 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1317 a2mp_discover_amp(chan);
f1496dee
JH		 1318 } else if (chan->conn->hcon->type == LE_LINK) {
1319 l2cap_le_start(chan);
93c3e8f5
AE		 1320 } else {
1321 l2cap_send_conn_req(chan);
1322 }
1323}
1324
aeaeb4bb
JH		 1325static void l2cap_request_info(struct l2cap_conn *conn)
1326{
1327 struct l2cap_info_req req;
1328
1329 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1330 return;
1331
1332 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1333
1334 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1335 conn->info_ident = l2cap_get_ident(conn);
1336
1337 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1338
1339 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1340 sizeof(req), &req);
1341}
1342
fc7f8a7e 1343static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1344{
8c1d787b 1345 struct l2cap_conn *conn = chan->conn;
79d554a6 1346
9f0caeb1 1347 if (conn->hcon->type == LE_LINK) {
96ac34fb 1348 l2cap_le_start(chan);
9f0caeb1
VCG		 1349 return;
1350 }
1351
aeaeb4bb
JH		 1352 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) {
1353 l2cap_request_info(conn);
1354 return;
1355 }
79d554a6 1356
aeaeb4bb
JH		 1357 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1358 return;
79d554a6 1359
aeaeb4bb
JH		 1360 if (l2cap_chan_check_security(chan, true) &&
1361 __l2cap_no_conn_pending(chan))
1362 l2cap_start_connection(chan);
79d554a6
MH		 1363}
1364
cf6c2c0b
GP		 1365static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1366{
1367 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1368 if (!disable_ertm)
cf6c2c0b
GP		 1369 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1370
1371 switch (mode) {
1372 case L2CAP_MODE_ERTM:
1373 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1374 case L2CAP_MODE_STREAMING:
1375 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1376 default:
1377 return 0x00;
1378 }
1379}
1380
5e4e3972 1381static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1382{
5e4e3972 1383 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1384 struct l2cap_disconn_req req;
1385
c13ffa62
GP		 1386 if (!conn)
1387 return;
1388
aad3d0e3 1389 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1390 __clear_retrans_timer(chan);
1391 __clear_monitor_timer(chan);
1392 __clear_ack_timer(chan);
c13ffa62
GP		 1393 }
1394
2338a7e0 1395 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1396 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1397 return;
1398 }
1399
fe4128e0
GP		 1400 req.dcid = cpu_to_le16(chan->dcid);
1401 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1402 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1403 sizeof(req), &req);
c13ffa62 1404
f8e73017 1405 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1406}
1407
1da177e4 1408/* ---- L2CAP connections ---- */
4e8402a3
MH		 1409static void l2cap_conn_start(struct l2cap_conn *conn)
1410{
3df91ea2 1411 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1412
1413 BT_DBG("conn %p", conn);
1414
3df91ea2 1415 mutex_lock(&conn->chan_lock);
4e8402a3 1416
3df91ea2 1417 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1418 l2cap_chan_lock(chan);
4e8402a3 1419
715ec005 1420 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb 1421 l2cap_chan_ready(chan);
6be36555 1422 l2cap_chan_unlock(chan);
79d554a6
MH		 1423 continue;
1424 }
1425
89bc500e 1426 if (chan->state == BT_CONNECT) {
e7cafc45 1427 if (!l2cap_chan_check_security(chan, true) ||
2d792818 1428 !__l2cap_no_conn_pending(chan)) {
6be36555 1429 l2cap_chan_unlock(chan);
47731de7
GP		 1430 continue;
1431 }
79d554a6 1432
c1360a1c 1433 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1434 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1435 &chan->conf_state)) {
89bc500e 1436 l2cap_chan_close(chan, ECONNRESET);
6be36555 1437 l2cap_chan_unlock(chan);
47731de7 1438 continue;
b1235d79 1439 }
47731de7 1440
93c3e8f5 1441 l2cap_start_connection(chan);
47731de7 1442
89bc500e 1443 } else if (chan->state == BT_CONNECT2) {
79d554a6 1444 struct l2cap_conn_rsp rsp;
e9aeb2dd 1445 char buf[128];
fe4128e0
GP		 1446 rsp.scid = cpu_to_le16(chan->dcid);
1447 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1448
e7cafc45 1449 if (l2cap_chan_check_security(chan, false)) {
bdc25783 1450 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
dcf4adbf
JP		 1451 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1452 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1453 chan->ops->defer(chan);
f66dc81f
MH		 1454
1455 } else {
acdcabf5 1456 l2cap_state_change(chan, BT_CONFIG);
dcf4adbf
JP		 1457 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1458 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1459 }
79d554a6 1460 } else {
dcf4adbf
JP		 1461 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1462 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1463 }
1464
fc7f8a7e 1465 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1466 sizeof(rsp), &rsp);
e9aeb2dd 1467
c1360a1c 1468 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1469 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1470 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1471 continue;
1472 }
1473
c1360a1c 1474 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1475 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
8cb091c6 1476 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
73ffa904 1477 chan->num_conf_req++;
4e8402a3
MH		 1478 }
1479
6be36555 1480 l2cap_chan_unlock(chan);
4e8402a3
MH		 1481 }
1482
3df91ea2 1483 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1484}
1485
b62f328b
VT		 1486static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1487{
cc8dba2b 1488 struct hci_conn *hcon = conn->hcon;
dcc36c16 1489 struct hci_dev *hdev = hcon->hdev;
b62f328b 1490
e760ec12 1491 BT_DBG("%s conn %p", hdev->name, conn);
b62f328b 1492
e760ec12
JH		 1493 /* For outgoing pairing which doesn't necessarily have an
1494 * associated socket (e.g. mgmt_pair_device).
1495 */
1496 if (hcon->out)
1497 smp_conn_security(hcon, hcon->pending_sec_level);
cc8dba2b 1498
80afeb6c
MH		 1499 /* For LE slave connections, make sure the connection interval
1500 * is in the range of the minium and maximum interval that has
1501 * been configured for this connection. If not, then trigger
1502 * the connection update procedure.
1503 */
40bef302 1504 if (hcon->role == HCI_ROLE_SLAVE &&
80afeb6c
MH		 1505 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1506 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1507 struct l2cap_conn_param_update_req req;
1508
1509 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1510 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1511 req.latency = cpu_to_le16(hcon->le_conn_latency);
1512 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1513
1514 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1515 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1516 }
b62f328b
VT		 1517}
1518
4e8402a3
MH		 1519static void l2cap_conn_ready(struct l2cap_conn *conn)
1520{
48454079 1521 struct l2cap_chan *chan;
cc110922 1522 struct hci_conn *hcon = conn->hcon;
4e8402a3 1523
79d554a6 1524 BT_DBG("conn %p", conn);
4e8402a3 1525
aeaeb4bb
JH		 1526 if (hcon->type == ACL_LINK)
1527 l2cap_request_info(conn);
1528
e760ec12
JH		 1529 mutex_lock(&conn->chan_lock);
1530
3df91ea2 1531 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1532
6be36555 1533 l2cap_chan_lock(chan);
4e8402a3 1534
2338a7e0 1535 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1536 l2cap_chan_unlock(chan);
1537 continue;
1538 }
1539
cc110922 1540 if (hcon->type == LE_LINK) {
f1496dee 1541 l2cap_le_start(chan);
63128451 1542 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
aeaeb4bb
JH		 1543 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
1544 l2cap_chan_ready(chan);
1c244f79 1545 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1546 l2cap_do_start(chan);
1c244f79 1547 }
4e8402a3 1548
6be36555 1549 l2cap_chan_unlock(chan);
4e8402a3 1550 }
79d554a6 1551
3df91ea2 1552 mutex_unlock(&conn->chan_lock);
61a939c6 1553
79a05727
JH		 1554 if (hcon->type == LE_LINK)
1555 l2cap_le_conn_ready(conn);
1556
61a939c6 1557 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1558}
1559
1560/* Notify sockets that we cannot guaranty reliability anymore */
1561static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1562{
48454079 1563 struct l2cap_chan *chan;
4e8402a3
MH		 1564
1565 BT_DBG("conn %p", conn);
1566
3df91ea2 1567 mutex_lock(&conn->chan_lock);
4e8402a3 1568
3df91ea2 1569 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1570 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1571 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1572 }
1573
3df91ea2 1574 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1575}
1576
f878fcad 1577static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1578{
f878fcad 1579 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1580 info_timer.work);
4e8402a3 1581
984947dc 1582 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1583 conn->info_ident = 0;
984947dc 1584
4e8402a3
MH		 1585 l2cap_conn_start(conn);
1586}
1587
2c8e1411
DH		 1588/*
1589 * l2cap_user
1590 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1591 * callback is called during registration. The ->remove callback is called
1592 * during unregistration.
1593 * An l2cap_user object can either be explicitly unregistered or when the
1594 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1595 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1596 * External modules must own a reference to the l2cap_conn object if they intend
1597 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1598 * any time if they don't.
1599 */
1600
1601int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1602{
1603 struct hci_dev *hdev = conn->hcon->hdev;
1604 int ret;
1605
1606 /* We need to check whether l2cap_conn is registered. If it is not, we
1607 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1608 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1609 * relies on the parent hci_conn object to be locked. This itself relies
1610 * on the hci_dev object to be locked. So we must lock the hci device
1611 * here, too. */
1612
1613 hci_dev_lock(hdev);
1614
835a6a2f 1615 if (!list_empty(&user->list)) {
2c8e1411
DH		 1616 ret = -EINVAL;
1617 goto out_unlock;
1618 }
1619
1620 /* conn->hchan is NULL after l2cap_conn_del() was called */
1621 if (!conn->hchan) {
1622 ret = -ENODEV;
1623 goto out_unlock;
1624 }
1625
1626 ret = user->probe(conn, user);
1627 if (ret)
1628 goto out_unlock;
1629
1630 list_add(&user->list, &conn->users);
1631 ret = 0;
1632
1633out_unlock:
1634 hci_dev_unlock(hdev);
1635 return ret;
1636}
1637EXPORT_SYMBOL(l2cap_register_user);
1638
1639void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1640{
1641 struct hci_dev *hdev = conn->hcon->hdev;
1642
1643 hci_dev_lock(hdev);
1644
835a6a2f 1645 if (list_empty(&user->list))
2c8e1411
DH		 1646 goto out_unlock;
1647
ab944c83 1648 list_del_init(&user->list);
2c8e1411
DH		 1649 user->remove(conn, user);
1650
1651out_unlock:
1652 hci_dev_unlock(hdev);
1653}
1654EXPORT_SYMBOL(l2cap_unregister_user);
1655
1656static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1657{
1658 struct l2cap_user *user;
1659
1660 while (!list_empty(&conn->users)) {
1661 user = list_first_entry(&conn->users, struct l2cap_user, list);
ab944c83 1662 list_del_init(&user->list);
2c8e1411
DH		 1663 user->remove(conn, user);
1664 }
1665}
1666
5d3de7df
VCG		 1667static void l2cap_conn_del(struct hci_conn *hcon, int err)
1668{
1669 struct l2cap_conn *conn = hcon->l2cap_data;
1670 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1671
1672 if (!conn)
1673 return;
1674
1675 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1676
1677 kfree_skb(conn->rx_skb);
1678
61a939c6 1679 skb_queue_purge(&conn->pending_rx);
7ab56c3a
JT		 1680
1681 /* We can not call flush_work(&conn->pending_rx_work) here since we
1682 * might block if we are running on a worker from the same workqueue
1683 * pending_rx_work is waiting on.
1684 */
1685 if (work_pending(&conn->pending_rx_work))
1686 cancel_work_sync(&conn->pending_rx_work);
61a939c6 1687
f3d82d0c
JH		 1688 if (work_pending(&conn->id_addr_update_work))
1689 cancel_work_sync(&conn->id_addr_update_work);
1690
2c8e1411
DH		 1691 l2cap_unregister_all_users(conn);
1692
e31fb860
JH		 1693 /* Force the connection to be immediately dropped */
1694 hcon->disc_timeout = 0;
1695
3df91ea2
AE		 1696 mutex_lock(&conn->chan_lock);
1697
5d3de7df
VCG		 1698 /* Kill channels */
1699 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1700 l2cap_chan_hold(chan);
6be36555
AE		 1701 l2cap_chan_lock(chan);
1702
5d3de7df 1703 l2cap_chan_del(chan, err);
6be36555
AE		 1704
1705 l2cap_chan_unlock(chan);
1706
80b98027 1707 chan->ops->close(chan);
61d6ef3e 1708 l2cap_chan_put(chan);
5d3de7df
VCG		 1709 }
1710
3df91ea2
AE		 1711 mutex_unlock(&conn->chan_lock);
1712
73d80deb
LAD		 1713 hci_chan_del(conn->hchan);
1714
5d3de7df 1715 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1716 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1717
5d3de7df 1718 hcon->l2cap_data = NULL;
9c903e37
DH		 1719 conn->hchan = NULL;
1720 l2cap_conn_put(conn);
5d3de7df
VCG		 1721}
1722
9c903e37
DH		 1723static void l2cap_conn_free(struct kref *ref)
1724{
1725 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1726
1727 hci_conn_put(conn->hcon);
1728 kfree(conn);
1729}
1730
51bb8457 1731struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
9c903e37
DH		 1732{
1733 kref_get(&conn->ref);
51bb8457 1734 return conn;
9c903e37
DH		 1735}
1736EXPORT_SYMBOL(l2cap_conn_get);
1737
1738void l2cap_conn_put(struct l2cap_conn *conn)
1739{
1740 kref_put(&conn->ref, l2cap_conn_free);
1741}
1742EXPORT_SYMBOL(l2cap_conn_put);
1743
1da177e4 1744/* ---- Socket interface ---- */
1da177e4 1745
c2287681 1746/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1747 * Returns closest match.
1748 */
c2287681
IY		 1749static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1750 bdaddr_t *src,
bf20fd4e
JH		 1751 bdaddr_t *dst,
1752 u8 link_type)
1da177e4 1753{
23691d75 1754 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1755
23691d75 1756 read_lock(&chan_list_lock);
e0f0cb56 1757
23691d75 1758 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1759 if (state && c->state != state)
1da177e4
LT		 1760 continue;
1761
bf20fd4e
JH		 1762 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1763 continue;
1764
1765 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1766 continue;
1767
23691d75 1768 if (c->psm == psm) {
c2287681
IY		 1769 int src_match, dst_match;
1770 int src_any, dst_any;
1771
1da177e4 1772 /* Exact match. */
7eafc59e
MH		 1773 src_match = !bacmp(&c->src, src);
1774 dst_match = !bacmp(&c->dst, dst);
c2287681 1775 if (src_match && dst_match) {
a24cce14 1776 l2cap_chan_hold(c);
a7567b20 1777 read_unlock(&chan_list_lock);
23691d75
GP		 1778 return c;
1779 }
1da177e4
LT		 1780
1781 /* Closest match */
7eafc59e
MH		 1782 src_any = !bacmp(&c->src, BDADDR_ANY);
1783 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1784 if ((src_match && dst_any) || (src_any && dst_match) ||
1785 (src_any && dst_any))
23691d75 1786 c1 = c;
1da177e4
LT		 1787 }
1788 }
1da177e4 1789
a24cce14
JH		 1790 if (c1)
1791 l2cap_chan_hold(c1);
1792
23691d75 1793 read_unlock(&chan_list_lock);
e0f0cb56 1794
23691d75 1795 return c1;
1da177e4
LT		 1796}
1797
721c4181 1798static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1799{
721c4181 1800 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1801 monitor_timer.work);
e90bac06 1802
525cd185 1803 BT_DBG("chan %p", chan);
0e98958d 1804
6be36555
AE		 1805 l2cap_chan_lock(chan);
1806
80909e04 1807 if (!chan->conn) {
6be36555 1808 l2cap_chan_unlock(chan);
8d7e1c7f 1809 l2cap_chan_put(chan);
e90bac06
GP		 1810 return;
1811 }
1812
401bb1f7 1813 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1814
6be36555 1815 l2cap_chan_unlock(chan);
8d7e1c7f 1816 l2cap_chan_put(chan);
e90bac06
GP		 1817}
1818
721c4181 1819static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1820{
721c4181 1821 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1822 retrans_timer.work);
e90bac06 1823
49208c9c 1824 BT_DBG("chan %p", chan);
0e98958d 1825
6be36555
AE		 1826 l2cap_chan_lock(chan);
1827
80909e04
MM		 1828 if (!chan->conn) {
1829 l2cap_chan_unlock(chan);
1830 l2cap_chan_put(chan);
1831 return;
1832 }
6be36555 1833
401bb1f7 1834 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1835 l2cap_chan_unlock(chan);
8d7e1c7f 1836 l2cap_chan_put(chan);
e90bac06
GP		 1837}
1838
d660366d
GP		 1839static void l2cap_streaming_send(struct l2cap_chan *chan,
1840 struct sk_buff_head *skbs)
6840ed07 1841{
ccbb84af 1842 struct sk_buff *skb;
3733937d 1843 struct l2cap_ctrl *control;
6840ed07 1844
3733937d
MM		 1845 BT_DBG("chan %p, skbs %p", chan, skbs);
1846
b99e13ad
MM		 1847 if (__chan_is_moving(chan))
1848 return;
1849
3733937d
MM		 1850 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1851
1852 while (!skb_queue_empty(&chan->tx_q)) {
1853
1854 skb = skb_dequeue(&chan->tx_q);
1855
a4368ff3
JH		 1856 bt_cb(skb)->l2cap.retries = 1;
1857 control = &bt_cb(skb)->l2cap;
3733937d
MM		 1858
1859 control->reqseq = 0;
1860 control->txseq = chan->next_tx_seq;
1861
1862 __pack_control(chan, control, skb);
6840ed07 1863
47d1ec61 1864 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1865 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1866 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1867 }
1868
4343478f 1869 l2cap_do_send(chan, skb);
6840ed07 1870
b4400672 1871 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1872
836be934 1873 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1874 chan->frames_sent++;
6840ed07 1875 }
6840ed07
GP		 1876}
1877
67c9e840 1878static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1879{
1880 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1881 struct l2cap_ctrl *control;
1882 int sent = 0;
1883
1884 BT_DBG("chan %p", chan);
1c2acffb 1885
89bc500e 1886 if (chan->state != BT_CONNECTED)
c13ffa62 1887 return -ENOTCONN;
e90bac06 1888
94122bbe
MM		 1889 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1890 return 0;
1891
b99e13ad
MM		 1892 if (__chan_is_moving(chan))
1893 return 0;
1894
18a48e76
MM		 1895 while (chan->tx_send_head &&
1896 chan->unacked_frames < chan->remote_tx_win &&
1897 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1898
18a48e76 1899 skb = chan->tx_send_head;
e90bac06 1900
a4368ff3
JH		 1901 bt_cb(skb)->l2cap.retries = 1;
1902 control = &bt_cb(skb)->l2cap;
95ffa978 1903
e2ab4353 1904 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1905 control->final = 1;
e2ab4353 1906
18a48e76
MM		 1907 control->reqseq = chan->buffer_seq;
1908 chan->last_acked_seq = chan->buffer_seq;
1909 control->txseq = chan->next_tx_seq;
1c2acffb 1910
18a48e76 1911 __pack_control(chan, control, skb);
e90bac06 1912
47d1ec61 1913 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1914 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1915 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1916 }
1917
18a48e76
MM		 1918 /* Clone after data has been modified. Data is assumed to be
1919 read-only (for locking purposes) on cloned sk_buffs.
1920 */
1921 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1922
18a48e76
MM		 1923 if (!tx_skb)
1924 break;
1c2acffb 1925
18a48e76 1926 __set_retrans_timer(chan);
836be934
AE		 1927
1928 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1929 chan->unacked_frames++;
6a026610 1930 chan->frames_sent++;
18a48e76 1931 sent++;
1c2acffb 1932
58d35f87
GP		 1933 if (skb_queue_is_last(&chan->tx_q, skb))
1934 chan->tx_send_head = NULL;
1c2acffb 1935 else
58d35f87 1936 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1937
1938 l2cap_do_send(chan, tx_skb);
b4400672 1939 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1940 }
1941
b4400672
AE		 1942 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1943 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1944
1945 return sent;
9e917af1
GP		 1946}
1947
e1fbd4c1
MM		 1948static void l2cap_ertm_resend(struct l2cap_chan *chan)
1949{
1950 struct l2cap_ctrl control;
1951 struct sk_buff *skb;
1952 struct sk_buff *tx_skb;
1953 u16 seq;
1954
1955 BT_DBG("chan %p", chan);
1956
1957 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1958 return;
1959
b99e13ad
MM		 1960 if (__chan_is_moving(chan))
1961 return;
1962
e1fbd4c1
MM		 1963 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1964 seq = l2cap_seq_list_pop(&chan->retrans_list);
1965
1966 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1967 if (!skb) {
1968 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1969 seq);
e1fbd4c1
MM		 1970 continue;
1971 }
1972
a4368ff3
JH		 1973 bt_cb(skb)->l2cap.retries++;
1974 control = bt_cb(skb)->l2cap;
e1fbd4c1
MM		 1975
1976 if (chan->max_tx != 0 &&
a4368ff3 1977 bt_cb(skb)->l2cap.retries > chan->max_tx) {
e1fbd4c1 1978 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1979 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1980 l2cap_seq_list_clear(&chan->retrans_list);
1981 break;
1982 }
1983
1984 control.reqseq = chan->buffer_seq;
1985 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1986 control.final = 1;
1987 else
1988 control.final = 0;
1989
1990 if (skb_cloned(skb)) {
1991 /* Cloned sk_buffs are read-only, so we need a
1992 * writeable copy
1993 */
8bcde1f2 1994 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1995 } else {
8bcde1f2 1996 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1997 }
1998
1999 if (!tx_skb) {
2000 l2cap_seq_list_clear(&chan->retrans_list);
2001 break;
2002 }
2003
2004 /* Update skb contents */
2005 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2006 put_unaligned_le32(__pack_extended_control(&control),
2007 tx_skb->data + L2CAP_HDR_SIZE);
2008 } else {
2009 put_unaligned_le16(__pack_enhanced_control(&control),
2010 tx_skb->data + L2CAP_HDR_SIZE);
2011 }
2012
13cac152 2013 /* Update FCS */
e1fbd4c1 2014 if (chan->fcs == L2CAP_FCS_CRC16) {
13cac152
LR		 2015 u16 fcs = crc16(0, (u8 *) tx_skb->data,
2016 tx_skb->len - L2CAP_FCS_SIZE);
2017 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
2018 L2CAP_FCS_SIZE);
e1fbd4c1
MM		 2019 }
2020
2021 l2cap_do_send(chan, tx_skb);
2022
2023 BT_DBG("Resent txseq %d", control.txseq);
2024
2025 chan->last_acked_seq = chan->buffer_seq;
2026 }
2027}
2028
f80842a8
MM		 2029static void l2cap_retransmit(struct l2cap_chan *chan,
2030 struct l2cap_ctrl *control)
2031{
2032 BT_DBG("chan %p, control %p", chan, control);
2033
2034 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2035 l2cap_ertm_resend(chan);
2036}
2037
d2a7ac5d
MM		 2038static void l2cap_retransmit_all(struct l2cap_chan *chan,
2039 struct l2cap_ctrl *control)
2040{
e1fbd4c1
MM		 2041 struct sk_buff *skb;
2042
2043 BT_DBG("chan %p, control %p", chan, control);
2044
2045 if (control->poll)
2046 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2047
2048 l2cap_seq_list_clear(&chan->retrans_list);
2049
2050 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2051 return;
2052
2053 if (chan->unacked_frames) {
2054 skb_queue_walk(&chan->tx_q, skb) {
a4368ff3 2055 if (bt_cb(skb)->l2cap.txseq == control->reqseq ||
2d792818 2056 skb == chan->tx_send_head)
e1fbd4c1
MM		 2057 break;
2058 }
2059
2060 skb_queue_walk_from(&chan->tx_q, skb) {
2061 if (skb == chan->tx_send_head)
2062 break;
2063
2064 l2cap_seq_list_append(&chan->retrans_list,
a4368ff3 2065 bt_cb(skb)->l2cap.txseq);
e1fbd4c1
MM		 2066 }
2067
2068 l2cap_ertm_resend(chan);
2069 }
d2a7ac5d
MM		 2070}
2071
0a0aba42 2072static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2073{
0a0aba42
MM		 2074 struct l2cap_ctrl control;
2075 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2076 chan->last_acked_seq);
2077 int threshold;
9e917af1 2078
0a0aba42
MM		 2079 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2080 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2081
0a0aba42
MM		 2082 memset(&control, 0, sizeof(control));
2083 control.sframe = 1;
dfc909be 2084
0a0aba42
MM		 2085 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2086 chan->rx_state == L2CAP_RX_STATE_RECV) {
2087 __clear_ack_timer(chan);
2088 control.super = L2CAP_SUPER_RNR;
2089 control.reqseq = chan->buffer_seq;
2090 l2cap_send_sframe(chan, &control);
2091 } else {
2092 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2093 l2cap_ertm_send(chan);
2094 /* If any i-frames were sent, they included an ack */
2095 if (chan->buffer_seq == chan->last_acked_seq)
2096 frames_to_ack = 0;
2097 }
dfc909be 2098
c20f8e35 2099 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2100 * Calculate without mul or div
2101 */
c20f8e35 2102 threshold = chan->ack_win;
0a0aba42
MM		 2103 threshold += threshold << 1;
2104 threshold >>= 2;
2105
b4400672 2106 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2107 threshold);
2108
2109 if (frames_to_ack >= threshold) {
2110 __clear_ack_timer(chan);
2111 control.super = L2CAP_SUPER_RR;
2112 control.reqseq = chan->buffer_seq;
2113 l2cap_send_sframe(chan, &control);
2114 frames_to_ack = 0;
2115 }
1c2acffb 2116
0a0aba42
MM		 2117 if (frames_to_ack)
2118 __set_ack_timer(chan);
2119 }
b17e73bb
SJ		 2120}
2121
04124681
GP		 2122static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2123 struct msghdr *msg, int len,
2124 int count, struct sk_buff *skb)
1c2acffb 2125{
0952a57a 2126 struct l2cap_conn *conn = chan->conn;
1c2acffb 2127 struct sk_buff **frag;
90338947 2128 int sent = 0;
1da177e4 2129
cbbd26b8 2130 if (!copy_from_iter_full(skb_put(skb, count), count, &msg->msg_iter))
1c2acffb 2131 return -EFAULT;
1da177e4
LT		 2132
2133 sent += count;
2134 len -= count;
2135
2136 /* Continuation fragments (no L2CAP header) */
2137 frag = &skb_shinfo(skb)->frag_list;
2138 while (len) {
fbe00700
GP		 2139 struct sk_buff *tmp;
2140
1da177e4
LT		 2141 count = min_t(unsigned int, conn->mtu, len);
2142
d9fbd02b 2143 tmp = chan->ops->alloc_skb(chan, 0, count,
fbe00700
GP		 2144 msg->msg_flags & MSG_DONTWAIT);
2145 if (IS_ERR(tmp))
2146 return PTR_ERR(tmp);
2147
2148 *frag = tmp;
2f7719ce 2149
cbbd26b8
AV		 2150 if (!copy_from_iter_full(skb_put(*frag, count), count,
2151 &msg->msg_iter))
1c2acffb 2152 return -EFAULT;
1da177e4
LT		 2153
2154 sent += count;
2155 len -= count;
2156
2d0ed3d5
GP		 2157 skb->len += (*frag)->len;
2158 skb->data_len += (*frag)->len;
2159
1da177e4
LT		 2160 frag = &(*frag)->next;
2161 }
1da177e4
LT		 2162
2163 return sent;
1c2acffb 2164}
1da177e4 2165
5e59b791 2166static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
8d46321c 2167 struct msghdr *msg, size_t len)
1c2acffb 2168{
8c1d787b 2169 struct l2cap_conn *conn = chan->conn;
1c2acffb 2170 struct sk_buff *skb;
03a51213 2171 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2172 struct l2cap_hdr *lh;
2173
8d46321c
MH		 2174 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2175 __le16_to_cpu(chan->psm), len);
1c2acffb
GP		 2176
2177 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2178
d9fbd02b 2179 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2180 msg->msg_flags & MSG_DONTWAIT);
2181 if (IS_ERR(skb))
2182 return skb;
1c2acffb
GP		 2183
2184 /* Create L2CAP header */
4df864c1 2185 lh = skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2186 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2187 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2188 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2189
0952a57a 2190 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2191 if (unlikely(err < 0)) {
2192 kfree_skb(skb);
2193 return ERR_PTR(err);
2194 }
2195 return skb;
2196}
2197
5e59b791 2198static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
8d46321c 2199 struct msghdr *msg, size_t len)
1c2acffb 2200{
8c1d787b 2201 struct l2cap_conn *conn = chan->conn;
1c2acffb 2202 struct sk_buff *skb;
f2ba7fae 2203 int err, count;
1c2acffb
GP		 2204 struct l2cap_hdr *lh;
2205
b4400672 2206 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2207
f2ba7fae 2208 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2209
d9fbd02b 2210 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
90338947
GP		 2211 msg->msg_flags & MSG_DONTWAIT);
2212 if (IS_ERR(skb))
2213 return skb;
1c2acffb
GP		 2214
2215 /* Create L2CAP header */
4df864c1 2216 lh = skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2217 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2218 lh->len = cpu_to_le16(len);
1c2acffb 2219
0952a57a 2220 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2221 if (unlikely(err < 0)) {
2222 kfree_skb(skb);
2223 return ERR_PTR(err);
2224 }
2225 return skb;
2226}
2227
ab0ff76d 2228static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2229 struct msghdr *msg, size_t len,
2230 u16 sdulen)
1c2acffb 2231{
8c1d787b 2232 struct l2cap_conn *conn = chan->conn;
1c2acffb 2233 struct sk_buff *skb;
e4ca6d98 2234 int err, count, hlen;
1c2acffb
GP		 2235 struct l2cap_hdr *lh;
2236
b4400672 2237 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2238
0ee0d208
GP		 2239 if (!conn)
2240 return ERR_PTR(-ENOTCONN);
2241
ba7aa64f 2242 hlen = __ertm_hdr_size(chan);
e4ca6d98 2243
c74e560c 2244 if (sdulen)
03a51213 2245 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2246
47d1ec61 2247 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2248 hlen += L2CAP_FCS_SIZE;
fcc203c3 2249
1c2acffb 2250 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce 2251
d9fbd02b 2252 skb = chan->ops->alloc_skb(chan, hlen, count,
90338947
GP		 2253 msg->msg_flags & MSG_DONTWAIT);
2254 if (IS_ERR(skb))
2255 return skb;
1c2acffb
GP		 2256
2257 /* Create L2CAP header */
4df864c1 2258 lh = skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2259 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2260 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2261
18a48e76
MM		 2262 /* Control header is populated later */
2263 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2264 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2265 else
2266 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2267
c74e560c 2268 if (sdulen)
03a51213 2269 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2270
0952a57a 2271 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2272 if (unlikely(err < 0)) {
2273 kfree_skb(skb);
2274 return ERR_PTR(err);
2275 }
e90bac06 2276
a4368ff3
JH		 2277 bt_cb(skb)->l2cap.fcs = chan->fcs;
2278 bt_cb(skb)->l2cap.retries = 0;
1c2acffb 2279 return skb;
1da177e4
LT		 2280}
2281
94122bbe
MM		 2282static int l2cap_segment_sdu(struct l2cap_chan *chan,
2283 struct sk_buff_head *seg_queue,
2284 struct msghdr *msg, size_t len)
c74e560c 2285{
c74e560c 2286 struct sk_buff *skb;
94122bbe
MM		 2287 u16 sdu_len;
2288 size_t pdu_len;
94122bbe 2289 u8 sar;
c74e560c 2290
b4400672 2291 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2292
94122bbe
MM		 2293 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2294 * so fragmented skbs are not used. The HCI layer's handling
2295 * of fragmented skbs is not compatible with ERTM's queueing.
2296 */
c74e560c 2297
94122bbe
MM		 2298 /* PDU size is derived from the HCI MTU */
2299 pdu_len = chan->conn->mtu;
c74e560c 2300
a549574d
MM		 2301 /* Constrain PDU size for BR/EDR connections */
2302 if (!chan->hs_hcon)
2303 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2304
2305 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2306 if (chan->fcs)
2307 pdu_len -= L2CAP_FCS_SIZE;
2308
ba7aa64f 2309 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2310
2311 /* Remote device may have requested smaller PDUs */
2312 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2313
2314 if (len <= pdu_len) {
2315 sar = L2CAP_SAR_UNSEGMENTED;
2316 sdu_len = 0;
2317 pdu_len = len;
2318 } else {
2319 sar = L2CAP_SAR_START;
2320 sdu_len = len;
94122bbe
MM		 2321 }
2322
2323 while (len > 0) {
2324 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2325
c74e560c 2326 if (IS_ERR(skb)) {
94122bbe 2327 __skb_queue_purge(seg_queue);
c74e560c
GP		 2328 return PTR_ERR(skb);
2329 }
2330
a4368ff3 2331 bt_cb(skb)->l2cap.sar = sar;
94122bbe
MM		 2332 __skb_queue_tail(seg_queue, skb);
2333
2334 len -= pdu_len;
069cb270 2335 if (sdu_len)
94122bbe 2336 sdu_len = 0;
94122bbe
MM		 2337
2338 if (len <= pdu_len) {
2339 sar = L2CAP_SAR_END;
2340 pdu_len = len;
2341 } else {
2342 sar = L2CAP_SAR_CONTINUE;
2343 }
c74e560c 2344 }
c74e560c 2345
f0f62799 2346 return 0;
c74e560c
GP		 2347}
2348
177f8f2b
JH		 2349static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2350 struct msghdr *msg,
2351 size_t len, u16 sdulen)
2352{
2353 struct l2cap_conn *conn = chan->conn;
2354 struct sk_buff *skb;
2355 int err, count, hlen;
2356 struct l2cap_hdr *lh;
2357
2358 BT_DBG("chan %p len %zu", chan, len);
2359
2360 if (!conn)
2361 return ERR_PTR(-ENOTCONN);
2362
2363 hlen = L2CAP_HDR_SIZE;
2364
2365 if (sdulen)
2366 hlen += L2CAP_SDULEN_SIZE;
2367
2368 count = min_t(unsigned int, (conn->mtu - hlen), len);
2369
d9fbd02b 2370 skb = chan->ops->alloc_skb(chan, hlen, count,
177f8f2b
JH		 2371 msg->msg_flags & MSG_DONTWAIT);
2372 if (IS_ERR(skb))
2373 return skb;
2374
2375 /* Create L2CAP header */
4df864c1 2376 lh = skb_put(skb, L2CAP_HDR_SIZE);
177f8f2b
JH		 2377 lh->cid = cpu_to_le16(chan->dcid);
2378 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2379
2380 if (sdulen)
2381 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2382
2383 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2384 if (unlikely(err < 0)) {
2385 kfree_skb(skb);
2386 return ERR_PTR(err);
2387 }
2388
2389 return skb;
2390}
2391
2392static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2393 struct sk_buff_head *seg_queue,
2394 struct msghdr *msg, size_t len)
2395{
2396 struct sk_buff *skb;
2397 size_t pdu_len;
2398 u16 sdu_len;
2399
2400 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2401
177f8f2b 2402 sdu_len = len;
72c6fb91 2403 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
177f8f2b
JH		 2404
2405 while (len > 0) {
2406 if (len <= pdu_len)
2407 pdu_len = len;
2408
2409 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2410 if (IS_ERR(skb)) {
2411 __skb_queue_purge(seg_queue);
2412 return PTR_ERR(skb);
2413 }
2414
2415 __skb_queue_tail(seg_queue, skb);
2416
2417 len -= pdu_len;
2418
2419 if (sdu_len) {
2420 sdu_len = 0;
2421 pdu_len += L2CAP_SDULEN_SIZE;
2422 }
2423 }
2424
2425 return 0;
2426}
2427
8a505b7f
LAD		 2428static void l2cap_le_flowctl_send(struct l2cap_chan *chan)
2429{
2430 int sent = 0;
2431
2432 BT_DBG("chan %p", chan);
2433
2434 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2435 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2436 chan->tx_credits--;
2437 sent++;
2438 }
2439
2440 BT_DBG("Sent %d credits %u queued %u", sent, chan->tx_credits,
2441 skb_queue_len(&chan->tx_q));
2442}
2443
8d46321c 2444int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
9a91a04a 2445{
9a91a04a 2446 struct sk_buff *skb;
9a91a04a 2447 int err;
94122bbe 2448 struct sk_buff_head seg_queue;
9a91a04a 2449
31e8ce80
SWK		 2450 if (!chan->conn)
2451 return -ENOTCONN;
2452
9a91a04a 2453 /* Connectionless channel */
715ec005 2454 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
8d46321c 2455 skb = l2cap_create_connless_pdu(chan, msg, len);
9a91a04a
GP		 2456 if (IS_ERR(skb))
2457 return PTR_ERR(skb);
2458
ede81a2a
AK		 2459 /* Channel lock is released before requesting new skb and then
2460 * reacquired thus we need to recheck channel state.
2461 */
2462 if (chan->state != BT_CONNECTED) {
2463 kfree_skb(skb);
2464 return -ENOTCONN;
2465 }
2466
9a91a04a
GP		 2467 l2cap_do_send(chan, skb);
2468 return len;
2469 }
2470
2471 switch (chan->mode) {
38319713 2472 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2473 /* Check outgoing MTU */
2474 if (len > chan->omtu)
2475 return -EMSGSIZE;
2476
177f8f2b
JH		 2477 __skb_queue_head_init(&seg_queue);
2478
2479 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2480
2481 if (chan->state != BT_CONNECTED) {
2482 __skb_queue_purge(&seg_queue);
2483 err = -ENOTCONN;
2484 }
2485
2486 if (err)
2487 return err;
2488
2489 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2490
8a505b7f 2491 l2cap_le_flowctl_send(chan);
177f8f2b
JH		 2492
2493 if (!chan->tx_credits)
2494 chan->ops->suspend(chan);
2495
2496 err = len;
2497
2498 break;
2499
fad5fc89 2500 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2501 /* Check outgoing MTU */
2502 if (len > chan->omtu)
2503 return -EMSGSIZE;
2504
2505 /* Create a basic PDU */
8d46321c 2506 skb = l2cap_create_basic_pdu(chan, msg, len);
9a91a04a
GP		 2507 if (IS_ERR(skb))
2508 return PTR_ERR(skb);
2509
ede81a2a
AK		 2510 /* Channel lock is released before requesting new skb and then
2511 * reacquired thus we need to recheck channel state.
2512 */
2513 if (chan->state != BT_CONNECTED) {
2514 kfree_skb(skb);
2515 return -ENOTCONN;
2516 }
2517
9a91a04a
GP		 2518 l2cap_do_send(chan, skb);
2519 err = len;
2520 break;
2521
2522 case L2CAP_MODE_ERTM:
2523 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2524 /* Check outgoing MTU */
2525 if (len > chan->omtu) {
2526 err = -EMSGSIZE;
2527 break;
2528 }
9a91a04a 2529
94122bbe 2530 __skb_queue_head_init(&seg_queue);
9a91a04a 2531
94122bbe
MM		 2532 /* Do segmentation before calling in to the state machine,
2533 * since it's possible to block while waiting for memory
2534 * allocation.
2535 */
2536 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2537
94122bbe
MM		 2538 /* The channel could have been closed while segmenting,
2539 * check that it is still connected.
2540 */
2541 if (chan->state != BT_CONNECTED) {
2542 __skb_queue_purge(&seg_queue);
2543 err = -ENOTCONN;
9a91a04a
GP		 2544 }
2545
94122bbe 2546 if (err)
9a91a04a 2547 break;
9a91a04a 2548
3733937d 2549 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2550 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2551 else
d660366d 2552 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2553
d660366d 2554 err = len;
9a91a04a 2555
94122bbe
MM		 2556 /* If the skbs were not queued for sending, they'll still be in
2557 * seg_queue and need to be purged.
2558 */
2559 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2560 break;
2561
2562 default:
2563 BT_DBG("bad state %1.1x", chan->mode);
2564 err = -EBADFD;
2565 }
2566
2567 return err;
2568}
6b8d4a6a 2569EXPORT_SYMBOL_GPL(l2cap_chan_send);
9a91a04a 2570
d2a7ac5d
MM		 2571static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2572{
bed68bde
MM		 2573 struct l2cap_ctrl control;
2574 u16 seq;
2575
b4400672 2576 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2577
2578 memset(&control, 0, sizeof(control));
2579 control.sframe = 1;
2580 control.super = L2CAP_SUPER_SREJ;
2581
2582 for (seq = chan->expected_tx_seq; seq != txseq;
2583 seq = __next_seq(chan, seq)) {
2584 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2585 control.reqseq = seq;
2586 l2cap_send_sframe(chan, &control);
2587 l2cap_seq_list_append(&chan->srej_list, seq);
2588 }
2589 }
2590
2591 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2592}
2593
2594static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2595{
bed68bde
MM		 2596 struct l2cap_ctrl control;
2597
2598 BT_DBG("chan %p", chan);
2599
2600 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2601 return;
2602
2603 memset(&control, 0, sizeof(control));
2604 control.sframe = 1;
2605 control.super = L2CAP_SUPER_SREJ;
2606 control.reqseq = chan->srej_list.tail;
2607 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2608}
2609
2610static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2611{
bed68bde
MM		 2612 struct l2cap_ctrl control;
2613 u16 initial_head;
2614 u16 seq;
2615
b4400672 2616 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2617
2618 memset(&control, 0, sizeof(control));
2619 control.sframe = 1;
2620 control.super = L2CAP_SUPER_SREJ;
2621
2622 /* Capture initial list head to allow only one pass through the list. */
2623 initial_head = chan->srej_list.head;
2624
2625 do {
2626 seq = l2cap_seq_list_pop(&chan->srej_list);
2627 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2628 break;
2629
2630 control.reqseq = seq;
2631 l2cap_send_sframe(chan, &control);
2632 l2cap_seq_list_append(&chan->srej_list, seq);
2633 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2634}
2635
608bcc6d
MM		 2636static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2637{
2638 struct sk_buff *acked_skb;
2639 u16 ackseq;
2640
b4400672 2641 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2642
2643 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2644 return;
2645
b4400672 2646 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2647 chan->expected_ack_seq, chan->unacked_frames);
2648
2649 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2650 ackseq = __next_seq(chan, ackseq)) {
2651
2652 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2653 if (acked_skb) {
2654 skb_unlink(acked_skb, &chan->tx_q);
2655 kfree_skb(acked_skb);
2656 chan->unacked_frames--;
2657 }
2658 }
2659
2660 chan->expected_ack_seq = reqseq;
2661
2662 if (chan->unacked_frames == 0)
2663 __clear_retrans_timer(chan);
2664
b4400672 2665 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2666}
2667
2668static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2669{
2670 BT_DBG("chan %p", chan);
2671
2672 chan->expected_tx_seq = chan->buffer_seq;
2673 l2cap_seq_list_clear(&chan->srej_list);
2674 skb_queue_purge(&chan->srej_q);
2675 chan->rx_state = L2CAP_RX_STATE_RECV;
2676}
2677
d660366d
GP		 2678static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2679 struct l2cap_ctrl *control,
2680 struct sk_buff_head *skbs, u8 event)
608bcc6d 2681{
608bcc6d
MM		 2682 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2683 event);
2684
2685 switch (event) {
2686 case L2CAP_EV_DATA_REQUEST:
2687 if (chan->tx_send_head == NULL)
2688 chan->tx_send_head = skb_peek(skbs);
2689
2690 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2691 l2cap_ertm_send(chan);
2692 break;
2693 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2694 BT_DBG("Enter LOCAL_BUSY");
2695 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2696
2697 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2698 /* The SREJ_SENT state must be aborted if we are to
2699 * enter the LOCAL_BUSY state.
2700 */
2701 l2cap_abort_rx_srej_sent(chan);
2702 }
2703
2704 l2cap_send_ack(chan);
2705
2706 break;
2707 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2708 BT_DBG("Exit LOCAL_BUSY");
2709 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2710
2711 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2712 struct l2cap_ctrl local_control;
2713
2714 memset(&local_control, 0, sizeof(local_control));
2715 local_control.sframe = 1;
2716 local_control.super = L2CAP_SUPER_RR;
2717 local_control.poll = 1;
2718 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2719 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2720
2721 chan->retry_count = 1;
2722 __set_monitor_timer(chan);
2723 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2724 }
2725 break;
2726 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2727 l2cap_process_reqseq(chan, control->reqseq);
2728 break;
2729 case L2CAP_EV_EXPLICIT_POLL:
2730 l2cap_send_rr_or_rnr(chan, 1);
2731 chan->retry_count = 1;
2732 __set_monitor_timer(chan);
2733 __clear_ack_timer(chan);
2734 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2735 break;
2736 case L2CAP_EV_RETRANS_TO:
2737 l2cap_send_rr_or_rnr(chan, 1);
2738 chan->retry_count = 1;
2739 __set_monitor_timer(chan);
2740 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2741 break;
2742 case L2CAP_EV_RECV_FBIT:
2743 /* Nothing to process */
2744 break;
2745 default:
2746 break;
2747 }
608bcc6d
MM		 2748}
2749
d660366d
GP		 2750static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2751 struct l2cap_ctrl *control,
2752 struct sk_buff_head *skbs, u8 event)
608bcc6d 2753{
608bcc6d
MM		 2754 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2755 event);
2756
2757 switch (event) {
2758 case L2CAP_EV_DATA_REQUEST:
2759 if (chan->tx_send_head == NULL)
2760 chan->tx_send_head = skb_peek(skbs);
2761 /* Queue data, but don't send. */
2762 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2763 break;
2764 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2765 BT_DBG("Enter LOCAL_BUSY");
2766 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2767
2768 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2769 /* The SREJ_SENT state must be aborted if we are to
2770 * enter the LOCAL_BUSY state.
2771 */
2772 l2cap_abort_rx_srej_sent(chan);
2773 }
2774
2775 l2cap_send_ack(chan);
2776
2777 break;
2778 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2779 BT_DBG("Exit LOCAL_BUSY");
2780 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2781
2782 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2783 struct l2cap_ctrl local_control;
2784 memset(&local_control, 0, sizeof(local_control));
2785 local_control.sframe = 1;
2786 local_control.super = L2CAP_SUPER_RR;
2787 local_control.poll = 1;
2788 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2789 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2790
2791 chan->retry_count = 1;
2792 __set_monitor_timer(chan);
2793 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2794 }
2795 break;
2796 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2797 l2cap_process_reqseq(chan, control->reqseq);
2798
2799 /* Fall through */
2800
2801 case L2CAP_EV_RECV_FBIT:
2802 if (control && control->final) {
2803 __clear_monitor_timer(chan);
2804 if (chan->unacked_frames > 0)
2805 __set_retrans_timer(chan);
2806 chan->retry_count = 0;
2807 chan->tx_state = L2CAP_TX_STATE_XMIT;
2808 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2809 }
2810 break;
2811 case L2CAP_EV_EXPLICIT_POLL:
2812 /* Ignore */
2813 break;
2814 case L2CAP_EV_MONITOR_TO:
2815 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2816 l2cap_send_rr_or_rnr(chan, 1);
2817 __set_monitor_timer(chan);
2818 chan->retry_count++;
2819 } else {
5e4e3972 2820 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2821 }
2822 break;
2823 default:
2824 break;
2825 }
608bcc6d
MM		 2826}
2827
d660366d
GP		 2828static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2829 struct sk_buff_head *skbs, u8 event)
608bcc6d 2830{
608bcc6d
MM		 2831 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2832 chan, control, skbs, event, chan->tx_state);
2833
2834 switch (chan->tx_state) {
2835 case L2CAP_TX_STATE_XMIT:
d660366d 2836 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2837 break;
2838 case L2CAP_TX_STATE_WAIT_F:
d660366d 2839 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2840 break;
2841 default:
2842 /* Ignore event */
2843 break;
2844 }
608bcc6d
MM		 2845}
2846
4b51dae9
MM		 2847static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2848 struct l2cap_ctrl *control)
2849{
2850 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2851 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2852}
2853
f80842a8
MM		 2854static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2855 struct l2cap_ctrl *control)
2856{
2857 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2858 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2859}
2860
1da177e4
LT		 2861/* Copy frame to all raw sockets on that connection */
2862static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2863{
1da177e4 2864 struct sk_buff *nskb;
48454079 2865 struct l2cap_chan *chan;
1da177e4
LT		 2866
2867 BT_DBG("conn %p", conn);
2868
3df91ea2 2869 mutex_lock(&conn->chan_lock);
3d57dc68 2870
3df91ea2 2871 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2872 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2873 continue;
2874
7f5396a7 2875 /* Don't send frame to the channel it came from */
a4368ff3 2876 if (bt_cb(skb)->l2cap.chan == chan)
1da177e4 2877 continue;
7f5396a7 2878
8bcde1f2 2879 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2880 if (!nskb)
1da177e4 2881 continue;
80b98027 2882 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2883 kfree_skb(nskb);
2884 }
3d57dc68 2885
3df91ea2 2886 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2887}
2888
2889/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2890static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2891 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2892{
2893 struct sk_buff *skb, **frag;
2894 struct l2cap_cmd_hdr *cmd;
2895 struct l2cap_hdr *lh;
2896 int len, count;
2897
b4400672
AE		 2898 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2899 conn, code, ident, dlen);
1da177e4 2900
300b962e
AL		 2901 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2902 return NULL;
2903
1da177e4
LT		 2904 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2905 count = min_t(unsigned int, conn->mtu, len);
2906
8bcde1f2 2907 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2908 if (!skb)
2909 return NULL;
2910
4df864c1 2911 lh = skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2912 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2913
2914 if (conn->hcon->type == LE_LINK)
dcf4adbf 2915 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2916 else
dcf4adbf 2917 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4 2918
4df864c1 2919 cmd = skb_put(skb, L2CAP_CMD_HDR_SIZE);
1da177e4
LT		 2920 cmd->code = code;
2921 cmd->ident = ident;
aca3192c 2922 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2923
2924 if (dlen) {
2925 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
59ae1d12 2926 skb_put_data(skb, data, count);
1da177e4
LT		 2927 data += count;
2928 }
2929
2930 len -= skb->len;
2931
2932 /* Continuation fragments (no L2CAP header) */
2933 frag = &skb_shinfo(skb)->frag_list;
2934 while (len) {
2935 count = min_t(unsigned int, conn->mtu, len);
2936
8bcde1f2 2937 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2938 if (!*frag)
2939 goto fail;
2940
59ae1d12 2941 skb_put_data(*frag, data, count);
1da177e4
LT		 2942
2943 len -= count;
2944 data += count;
2945
2946 frag = &(*frag)->next;
2947 }
2948
2949 return skb;
2950
2951fail:
2952 kfree_skb(skb);
2953 return NULL;
2954}
2955
2d792818
GP		 2956static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2957 unsigned long *val)
1da177e4
LT		 2958{
2959 struct l2cap_conf_opt *opt = *ptr;
2960 int len;
2961
2962 len = L2CAP_CONF_OPT_SIZE + opt->len;
2963 *ptr += len;
2964
2965 *type = opt->type;
2966 *olen = opt->len;
2967
2968 switch (opt->len) {
2969 case 1:
2970 *val = *((u8 *) opt->val);
2971 break;
2972
2973 case 2:
bfaaeb3e 2974 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2975 break;
2976
2977 case 4:
bfaaeb3e 2978 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2979 break;
2980
2981 default:
2982 *val = (unsigned long) opt->val;
2983 break;
2984 }
2985
b4400672 2986 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2987 return len;
2988}
2989
8cb091c6 2990static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val, size_t size)
1da177e4
LT		 2991{
2992 struct l2cap_conf_opt *opt = *ptr;
2993
b4400672 2994 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4 2995
8cb091c6
BS		 2996 if (size < L2CAP_CONF_OPT_SIZE + len)
2997 return;
2998
1da177e4
LT		 2999 opt->type = type;
3000 opt->len = len;
3001
3002 switch (len) {
3003 case 1:
3004 *((u8 *) opt->val) = val;
3005 break;
3006
3007 case 2:
4f8b691c 3008 put_unaligned_le16(val, opt->val);
1da177e4
LT		 3009 break;
3010
3011 case 4:
4f8b691c 3012 put_unaligned_le32(val, opt->val);
1da177e4
LT		 3013 break;
3014
3015 default:
3016 memcpy(opt->val, (void *) val, len);
3017 break;
3018 }
3019
3020 *ptr += L2CAP_CONF_OPT_SIZE + len;
3021}
3022
8cb091c6 3023static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan, size_t size)
f89cef09
AE		 3024{
3025 struct l2cap_conf_efs efs;
3026
1ec918ce 3027 switch (chan->mode) {
f89cef09
AE		 3028 case L2CAP_MODE_ERTM:
3029 efs.id = chan->local_id;
3030 efs.stype = chan->local_stype;
3031 efs.msdu = cpu_to_le16(chan->local_msdu);
3032 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
dcf4adbf
JP		 3033 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
3034 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3035 break;
3036
3037 case L2CAP_MODE_STREAMING:
3038 efs.id = 1;
3039 efs.stype = L2CAP_SERV_BESTEFFORT;
3040 efs.msdu = cpu_to_le16(chan->local_msdu);
3041 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3042 efs.acc_lat = 0;
3043 efs.flush_to = 0;
3044 break;
3045
3046 default:
3047 return;
3048 }
3049
3050 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8cb091c6 3051 (unsigned long) &efs, size);
f89cef09
AE		 3052}
3053
721c4181 3054static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3055{
721c4181 3056 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3057 ack_timer.work);
3058 u16 frames_to_ack;
c1b4f43b 3059
2fb9b3d4
GP		 3060 BT_DBG("chan %p", chan);
3061
6be36555
AE		 3062 l2cap_chan_lock(chan);
3063
0362520b
MM		 3064 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3065 chan->last_acked_seq);
6be36555 3066
0362520b
MM		 3067 if (frames_to_ack)
3068 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3069
0362520b 3070 l2cap_chan_unlock(chan);
09bfb2ee 3071 l2cap_chan_put(chan);
c1b4f43b
GP		 3072}
3073
466f8004 3074int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3075{
3c588192
MM		 3076 int err;
3077
105bdf9e
MM		 3078 chan->next_tx_seq = 0;
3079 chan->expected_tx_seq = 0;
42e5c802 3080 chan->expected_ack_seq = 0;
6a026610 3081 chan->unacked_frames = 0;
42e5c802 3082 chan->buffer_seq = 0;
6a026610 3083 chan->frames_sent = 0;
105bdf9e
MM		 3084 chan->last_acked_seq = 0;
3085 chan->sdu = NULL;
3086 chan->sdu_last_frag = NULL;
3087 chan->sdu_len = 0;
3088
d34c34fb
MM		 3089 skb_queue_head_init(&chan->tx_q);
3090
6ed971ca
MH		 3091 chan->local_amp_id = AMP_ID_BREDR;
3092 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3093 chan->move_state = L2CAP_MOVE_STABLE;
3094 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3095
105bdf9e
MM		 3096 if (chan->mode != L2CAP_MODE_ERTM)
3097 return 0;
3098
3099 chan->rx_state = L2CAP_RX_STATE_RECV;
3100 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3101
721c4181
GP		 3102 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3103 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3104 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3105
f1c6775b 3106 skb_queue_head_init(&chan->srej_q);
1890d36b 3107
3c588192
MM		 3108 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3109 if (err < 0)
3110 return err;
3111
9dc9affc
MM		 3112 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3113 if (err < 0)
3114 l2cap_seq_list_free(&chan->srej_list);
3115
3116 return err;
0565c1c2
GP		 3117}
3118
f2fcfcd6
GP		 3119static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3120{
3121 switch (mode) {
3122 case L2CAP_MODE_STREAMING:
3123 case L2CAP_MODE_ERTM:
3124 if (l2cap_mode_supported(mode, remote_feat_mask))
3125 return mode;
3126 /* fall through */
3127 default:
3128 return L2CAP_MODE_BASIC;
3129 }
3130}
3131
848566b3 3132static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3133{
0bd49fc7
JH		 3134 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3135 (conn->feat_mask & L2CAP_FEAT_EXT_WINDOW));
6327eb98
AE		 3136}
3137
848566b3 3138static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3139{
0bd49fc7
JH		 3140 return ((conn->local_fixed_chan & L2CAP_FC_A2MP) &&
3141 (conn->feat_mask & L2CAP_FEAT_EXT_FLOW));
f89cef09
AE		 3142}
3143
36c86c85
MM		 3144static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3145 struct l2cap_conf_rfc *rfc)
3146{
6ed971ca 3147 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3148 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3149
3150 /* Class 1 devices have must have ERTM timeouts
3151 * exceeding the Link Supervision Timeout. The
3152 * default Link Supervision Timeout for AMP
3153 * controllers is 10 seconds.
3154 *
3155 * Class 1 devices use 0xffffffff for their
3156 * best-effort flush timeout, so the clamping logic
3157 * will result in a timeout that meets the above
3158 * requirement. ERTM timeouts are 16-bit values, so
3159 * the maximum timeout is 65.535 seconds.
3160 */
3161
3162 /* Convert timeout to milliseconds and round */
3163 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3164
3165 /* This is the recommended formula for class 2 devices
3166 * that start ERTM timers when packets are sent to the
3167 * controller.
3168 */
3169 ertm_to = 3 * ertm_to + 500;
3170
3171 if (ertm_to > 0xffff)
3172 ertm_to = 0xffff;
3173
3174 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3175 rfc->monitor_timeout = rfc->retrans_timeout;
3176 } else {
dcf4adbf
JP		 3177 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3178 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
36c86c85
MM		 3179 }
3180}
3181
6327eb98
AE		 3182static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3183{
3184 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3185 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3186 /* use extended control field */
3187 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3188 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3189 } else {
6327eb98 3190 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3191 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3192 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3193 }
c20f8e35 3194 chan->ack_win = chan->tx_win;
6327eb98
AE		 3195}
3196
8cb091c6 3197static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data, size_t data_size)
1da177e4 3198{
1da177e4 3199 struct l2cap_conf_req *req = data;
0c1bc5c6 3200 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3201 void *ptr = req->data;
8cb091c6 3202 void *endptr = data + data_size;
c8f79162 3203 u16 size;
1da177e4 3204
49208c9c 3205 BT_DBG("chan %p", chan);
1da177e4 3206
73ffa904 3207 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3208 goto done;
3209
0c1bc5c6 3210 switch (chan->mode) {
f2fcfcd6
GP		 3211 case L2CAP_MODE_STREAMING:
3212 case L2CAP_MODE_ERTM:
c1360a1c 3213 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3214 break;
85eb53c6 3215
848566b3 3216 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3217 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3218
2ba13ed6 3219 /* fall through */
f2fcfcd6 3220 default:
8c1d787b 3221 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3222 break;
3223 }
3224
3225done:
0c1bc5c6 3226 if (chan->imtu != L2CAP_DEFAULT_MTU)
8cb091c6 3227 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu, endptr - ptr);
7990681c 3228
0c1bc5c6 3229 switch (chan->mode) {
65c7c491 3230 case L2CAP_MODE_BASIC:
6fea7ad1
MH		 3231 if (disable_ertm)
3232 break;
3233
8c1d787b 3234 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3235 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3236 break;
3237
62547752
GP		 3238 rfc.mode = L2CAP_MODE_BASIC;
3239 rfc.txwin_size = 0;
3240 rfc.max_transmit = 0;
3241 rfc.retrans_timeout = 0;
3242 rfc.monitor_timeout = 0;
3243 rfc.max_pdu_size = 0;
3244
63406504 3245 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
8cb091c6 3246 (unsigned long) &rfc, endptr - ptr);
65c7c491
MH		 3247 break;
3248
3249 case L2CAP_MODE_ERTM:
3250 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3251 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3252
3253 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3254
3255 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3256 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3257 L2CAP_FCS_SIZE);
c8f79162 3258 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3259
6327eb98
AE		 3260 l2cap_txwin_setup(chan);
3261
3262 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3263 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3264
63406504 3265 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
8cb091c6 3266 (unsigned long) &rfc, endptr - ptr);
63406504 3267
f89cef09 3268 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
8cb091c6 3269 l2cap_add_opt_efs(&ptr, chan, endptr - ptr);
f89cef09 3270
6327eb98
AE		 3271 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3272 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
8cb091c6 3273 chan->tx_win, endptr - ptr);
60918918
AE		 3274
3275 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3276 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3277 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3278 chan->fcs = L2CAP_FCS_NONE;
3279 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
8cb091c6 3280 chan->fcs, endptr - ptr);
60918918 3281 }
f2fcfcd6
GP		 3282 break;
3283
3284 case L2CAP_MODE_STREAMING:
273759e2 3285 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3286 rfc.mode = L2CAP_MODE_STREAMING;
3287 rfc.txwin_size = 0;
3288 rfc.max_transmit = 0;
3289 rfc.retrans_timeout = 0;
3290 rfc.monitor_timeout = 0;
c8f79162
AE		 3291
3292 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3293 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3294 L2CAP_FCS_SIZE);
c8f79162 3295 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3296
63406504 3297 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
8cb091c6 3298 (unsigned long) &rfc, endptr - ptr);
63406504 3299
f89cef09 3300 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
8cb091c6 3301 l2cap_add_opt_efs(&ptr, chan, endptr - ptr);
f89cef09 3302
60918918
AE		 3303 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3304 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3305 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3306 chan->fcs = L2CAP_FCS_NONE;
3307 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
8cb091c6 3308 chan->fcs, endptr - ptr);
60918918 3309 }
65c7c491
MH		 3310 break;
3311 }
1da177e4 3312
fe4128e0 3313 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3314 req->flags = cpu_to_le16(0);
1da177e4
LT		 3315
3316 return ptr - data;
3317}
3318
8cb091c6 3319static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data, size_t data_size)
1da177e4 3320{
5dee9e7c
MH		 3321 struct l2cap_conf_rsp *rsp = data;
3322 void *ptr = rsp->data;
8cb091c6 3323 void *endptr = data + data_size;
73ffa904
GP		 3324 void *req = chan->conf_req;
3325 int len = chan->conf_len;
5dee9e7c
MH		 3326 int type, hint, olen;
3327 unsigned long val;
6464f35f 3328 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3329 struct l2cap_conf_efs efs;
3330 u8 remote_efs = 0;
861d6882 3331 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3332 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3333 u16 size;
1da177e4 3334
73ffa904 3335 BT_DBG("chan %p", chan);
820ae1b8 3336
5dee9e7c
MH		 3337 while (len >= L2CAP_CONF_OPT_SIZE) {
3338 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3339
589d2746 3340 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3341 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3342
3343 switch (type) {
3344 case L2CAP_CONF_MTU:
861d6882 3345 mtu = val;
5dee9e7c
MH		 3346 break;
3347
3348 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3349 chan->flush_to = val;
5dee9e7c
MH		 3350 break;
3351
3352 case L2CAP_CONF_QOS:
3353 break;
3354
6464f35f
MH		 3355 case L2CAP_CONF_RFC:
3356 if (olen == sizeof(rfc))
3357 memcpy(&rfc, (void *) val, olen);
3358 break;
3359
fcc203c3
GP		 3360 case L2CAP_CONF_FCS:
3361 if (val == L2CAP_FCS_NONE)
f2592d3e 3362 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3363 break;
fcc203c3 3364
42dceae2
AE		 3365 case L2CAP_CONF_EFS:
3366 remote_efs = 1;
3367 if (olen == sizeof(efs))
3368 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3369 break;
3370
6327eb98 3371 case L2CAP_CONF_EWS:
0bd49fc7 3372 if (!(chan->conn->local_fixed_chan & L2CAP_FC_A2MP))
6327eb98 3373 return -ECONNREFUSED;
fcc203c3 3374
6327eb98
AE		 3375 set_bit(FLAG_EXT_CTRL, &chan->flags);
3376 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3377 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3378 chan->remote_tx_win = val;
fcc203c3
GP		 3379 break;
3380
5dee9e7c
MH		 3381 default:
3382 if (hint)
3383 break;
3384
3385 result = L2CAP_CONF_UNKNOWN;
3386 *((u8 *) ptr++) = type;
3387 break;
3388 }
3389 }
3390
73ffa904 3391 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3392 goto done;
3393
0c1bc5c6 3394 switch (chan->mode) {
f2fcfcd6
GP		 3395 case L2CAP_MODE_STREAMING:
3396 case L2CAP_MODE_ERTM:
c1360a1c 3397 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3398 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3399 chan->conn->feat_mask);
85eb53c6
GP		 3400 break;
3401 }
3402
42dceae2 3403 if (remote_efs) {
848566b3 3404 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3405 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3406 else
3407 return -ECONNREFUSED;
3408 }
3409
0c1bc5c6 3410 if (chan->mode != rfc.mode)
f2fcfcd6 3411 return -ECONNREFUSED;
742e519b 3412
f2fcfcd6 3413 break;
f2fcfcd6
GP		 3414 }
3415
3416done:
0c1bc5c6 3417 if (chan->mode != rfc.mode) {
f2fcfcd6 3418 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3419 rfc.mode = chan->mode;
f2fcfcd6 3420
73ffa904 3421 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3422 return -ECONNREFUSED;
3423
2d792818 3424 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
8cb091c6 3425 (unsigned long) &rfc, endptr - ptr);
f2fcfcd6
GP		 3426 }
3427
5dee9e7c
MH		 3428 if (result == L2CAP_CONF_SUCCESS) {
3429 /* Configure output options and let the other side know
3430 * which ones we don't like. */
3431
f2fcfcd6
GP		 3432 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3433 result = L2CAP_CONF_UNACCEPT;
3434 else {
0c1bc5c6 3435 chan->omtu = mtu;
c1360a1c 3436 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3437 }
8cb091c6 3438 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu, endptr - ptr);
6464f35f 3439
42dceae2
AE		 3440 if (remote_efs) {
3441 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3442 efs.stype != L2CAP_SERV_NOTRAFIC &&
3443 efs.stype != chan->local_stype) {
42dceae2
AE		 3444
3445 result = L2CAP_CONF_UNACCEPT;
3446
3447 if (chan->num_conf_req >= 1)
3448 return -ECONNREFUSED;
3449
3450 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818 3451 sizeof(efs),
8cb091c6 3452 (unsigned long) &efs, endptr - ptr);
0e8b207e 3453 } else {
3e6b3b95 3454 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3455 result = L2CAP_CONF_PENDING;
3456 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3457 }
3458 }
3459
f2fcfcd6
GP		 3460 switch (rfc.mode) {
3461 case L2CAP_MODE_BASIC:
47d1ec61 3462 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3463 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3464 break;
3465
3466 case L2CAP_MODE_ERTM:
6327eb98
AE		 3467 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3468 chan->remote_tx_win = rfc.txwin_size;
3469 else
3470 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3471
2c03a7a4 3472 chan->remote_max_tx = rfc.max_transmit;
1c762159 3473
c8f79162 3474 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3475 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3476 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3477 rfc.max_pdu_size = cpu_to_le16(size);
3478 chan->remote_mps = size;
f2fcfcd6 3479
36c86c85 3480 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3481
c1360a1c 3482 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3483
3484 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
8cb091c6 3485 sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
68ae6639 3486
42dceae2
AE		 3487 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3488 chan->remote_id = efs.id;
3489 chan->remote_stype = efs.stype;
3490 chan->remote_msdu = le16_to_cpu(efs.msdu);
3491 chan->remote_flush_to =
2d792818 3492 le32_to_cpu(efs.flush_to);
42dceae2 3493 chan->remote_acc_lat =
2d792818 3494 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3495 chan->remote_sdu_itime =
3496 le32_to_cpu(efs.sdu_itime);
3497 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818 3498 sizeof(efs),
8cb091c6 3499 (unsigned long) &efs, endptr - ptr);
42dceae2 3500 }
f2fcfcd6
GP		 3501 break;
3502
3503 case L2CAP_MODE_STREAMING:
c8f79162 3504 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3505 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3506 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3507 rfc.max_pdu_size = cpu_to_le16(size);
3508 chan->remote_mps = size;
f2fcfcd6 3509
c1360a1c 3510 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3511
2d792818 3512 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
8cb091c6 3513 (unsigned long) &rfc, endptr - ptr);
68ae6639 3514
f2fcfcd6
GP		 3515 break;
3516
3517 default:
5dee9e7c 3518 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3519
6464f35f 3520 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3521 rfc.mode = chan->mode;
f2fcfcd6 3522 }
6464f35f 3523
f2fcfcd6 3524 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3525 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3526 }
fe4128e0 3527 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3528 rsp->result = cpu_to_le16(result);
dcf4adbf 3529 rsp->flags = cpu_to_le16(0);
5dee9e7c
MH		 3530
3531 return ptr - data;
1da177e4
LT		 3532}
3533
2d792818 3534static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
8cb091c6 3535 void *data, size_t size, u16 *result)
f2fcfcd6 3536{
f2fcfcd6
GP		 3537 struct l2cap_conf_req *req = data;
3538 void *ptr = req->data;
8cb091c6 3539 void *endptr = data + size;
f2fcfcd6
GP		 3540 int type, olen;
3541 unsigned long val;
36e999a8 3542 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3543 struct l2cap_conf_efs efs;
f2fcfcd6 3544
fe4128e0 3545 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3546
3547 while (len >= L2CAP_CONF_OPT_SIZE) {
3548 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3549
3550 switch (type) {
3551 case L2CAP_CONF_MTU:
3552 if (val < L2CAP_DEFAULT_MIN_MTU) {
3553 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3554 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3555 } else
0c1bc5c6 3556 chan->imtu = val;
8cb091c6 3557 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu, endptr - ptr);
f2fcfcd6
GP		 3558 break;
3559
3560 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3561 chan->flush_to = val;
f2fcfcd6 3562 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
8cb091c6 3563 2, chan->flush_to, endptr - ptr);
f2fcfcd6
GP		 3564 break;
3565
3566 case L2CAP_CONF_RFC:
3567 if (olen == sizeof(rfc))
3568 memcpy(&rfc, (void *)val, olen);
3569
c1360a1c 3570 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3571 rfc.mode != chan->mode)
f2fcfcd6
GP		 3572 return -ECONNREFUSED;
3573
47d1ec61 3574 chan->fcs = 0;
f2fcfcd6
GP		 3575
3576 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
8cb091c6 3577 sizeof(rfc), (unsigned long) &rfc, endptr - ptr);
f2fcfcd6 3578 break;
6327eb98
AE		 3579
3580 case L2CAP_CONF_EWS:
c20f8e35 3581 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3582 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
8cb091c6 3583 chan->tx_win, endptr - ptr);
6327eb98 3584 break;
66af7aaf
AE		 3585
3586 case L2CAP_CONF_EFS:
3587 if (olen == sizeof(efs))
3588 memcpy(&efs, (void *)val, olen);
3589
3590 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3591 efs.stype != L2CAP_SERV_NOTRAFIC &&
3592 efs.stype != chan->local_stype)
66af7aaf
AE		 3593 return -ECONNREFUSED;
3594
2d792818 3595 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
8cb091c6 3596 (unsigned long) &efs, endptr - ptr);
66af7aaf 3597 break;
cbabee78
AE		 3598
3599 case L2CAP_CONF_FCS:
3600 if (*result == L2CAP_CONF_PENDING)
3601 if (val == L2CAP_FCS_NONE)
f2592d3e 3602 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3603 &chan->conf_state);
3604 break;
f2fcfcd6
GP		 3605 }
3606 }
3607
0c1bc5c6 3608 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3609 return -ECONNREFUSED;
3610
0c1bc5c6 3611 chan->mode = rfc.mode;
6c2ea7a8 3612
0e8b207e 3613 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3614 switch (rfc.mode) {
3615 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3616 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3617 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3618 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3619 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3620 chan->ack_win = min_t(u16, chan->ack_win,
3621 rfc.txwin_size);
66af7aaf
AE		 3622
3623 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3624 chan->local_msdu = le16_to_cpu(efs.msdu);
3625 chan->local_sdu_itime =
2d792818 3626 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3627 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3628 chan->local_flush_to =
2d792818 3629 le32_to_cpu(efs.flush_to);
66af7aaf 3630 }
f2fcfcd6 3631 break;
66af7aaf 3632
f2fcfcd6 3633 case L2CAP_MODE_STREAMING:
47d1ec61 3634 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3635 }
3636 }
3637
fe4128e0 3638 req->dcid = cpu_to_le16(chan->dcid);
dcf4adbf 3639 req->flags = cpu_to_le16(0);
f2fcfcd6
GP		 3640
3641 return ptr - data;
3642}
3643
2d792818
GP		 3644static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3645 u16 result, u16 flags)
1da177e4
LT		 3646{
3647 struct l2cap_conf_rsp *rsp = data;
3648 void *ptr = rsp->data;
1da177e4 3649
fe4128e0 3650 BT_DBG("chan %p", chan);
1da177e4 3651
fe4128e0 3652 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3653 rsp->result = cpu_to_le16(result);
aca3192c 3654 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3655
3656 return ptr - data;
3657}
3658
27e2d4c8
JH		 3659void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3660{
3661 struct l2cap_le_conn_rsp rsp;
3662 struct l2cap_conn *conn = chan->conn;
3663
3664 BT_DBG("chan %p", chan);
3665
3666 rsp.dcid = cpu_to_le16(chan->scid);
3667 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3668 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3669 rsp.credits = cpu_to_le16(chan->rx_credits);
dcf4adbf 3670 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
27e2d4c8
JH		 3671
3672 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3673 &rsp);
3674}
3675
8c1d787b 3676void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3677{
3678 struct l2cap_conn_rsp rsp;
8c1d787b 3679 struct l2cap_conn *conn = chan->conn;
710f9b0a 3680 u8 buf[128];
439f34ac 3681 u8 rsp_code;
710f9b0a 3682
fe4128e0
GP		 3683 rsp.scid = cpu_to_le16(chan->dcid);
3684 rsp.dcid = cpu_to_le16(chan->scid);
dcf4adbf
JP		 3685 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3686 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3687
3688 if (chan->hs_hcon)
3689 rsp_code = L2CAP_CREATE_CHAN_RSP;
3690 else
3691 rsp_code = L2CAP_CONN_RSP;
3692
3693 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3694
3695 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3696
c1360a1c 3697 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3698 return;
3699
710f9b0a 3700 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
8cb091c6 3701 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
710f9b0a
GP		 3702 chan->num_conf_req++;
3703}
3704
47d1ec61 3705static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3706{
7b1c0049
GP		 3707 int type, olen;
3708 unsigned long val;
c20f8e35
MM		 3709 /* Use sane default values in case a misbehaving remote device
3710 * did not send an RFC or extended window size option.
3711 */
3712 u16 txwin_ext = chan->ack_win;
3713 struct l2cap_conf_rfc rfc = {
3714 .mode = chan->mode,
dcf4adbf
JP		 3715 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3716 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
c20f8e35
MM		 3717 .max_pdu_size = cpu_to_le16(chan->imtu),
3718 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3719 };
7b1c0049 3720
47d1ec61 3721 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3722
0c1bc5c6 3723 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3724 return;
3725
3726 while (len >= L2CAP_CONF_OPT_SIZE) {
3727 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3728
c20f8e35
MM		 3729 switch (type) {
3730 case L2CAP_CONF_RFC:
3731 if (olen == sizeof(rfc))
3732 memcpy(&rfc, (void *)val, olen);
8f321f85 3733 break;
c20f8e35
MM		 3734 case L2CAP_CONF_EWS:
3735 txwin_ext = val;
3736 break;
3737 }
7b1c0049
GP		 3738 }
3739
7b1c0049
GP		 3740 switch (rfc.mode) {
3741 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3742 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3743 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3744 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3745 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3746 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3747 else
3748 chan->ack_win = min_t(u16, chan->ack_win,
3749 rfc.txwin_size);
7b1c0049
GP		 3750 break;
3751 case L2CAP_MODE_STREAMING:
47d1ec61 3752 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3753 }
3754}
3755
2d792818 3756static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3757 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3758 u8 *data)
4e8402a3 3759{
e2fd318e 3760 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3761
cb3b3152
JH		 3762 if (cmd_len < sizeof(*rej))
3763 return -EPROTO;
3764
e2fd318e 3765 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3766 return 0;
3767
3768 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3769 cmd->ident == conn->info_ident) {
17cd3f37 3770 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3771
3772 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3773 conn->info_ident = 0;
984947dc 3774
4e8402a3
MH		 3775 l2cap_conn_start(conn);
3776 }
3777
3778 return 0;
3779}
3780
1700915f
MM		 3781static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3782 struct l2cap_cmd_hdr *cmd,
3783 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3784{
1da177e4
LT		 3785 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3786 struct l2cap_conn_rsp rsp;
23691d75 3787 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3788 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3789
3790 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3791 __le16 psm = req->psm;
1da177e4 3792
097db76c 3793 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3794
3795 /* Check if we have socket listening on psm */
6f59b904 3796 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3797 &conn->hcon->dst, ACL_LINK);
23691d75 3798 if (!pchan) {
1da177e4
LT		 3799 result = L2CAP_CR_BAD_PSM;
3800 goto sendresp;
3801 }
3802
3df91ea2 3803 mutex_lock(&conn->chan_lock);
8ffb9290 3804 l2cap_chan_lock(pchan);
e0f0cb56 3805
e7c29cb1 3806 /* Check if the ACL is secure enough (if not SDP) */
dcf4adbf 3807 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3808 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3809 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3810 result = L2CAP_CR_SEC_BLOCK;
3811 goto response;
3812 }
3813
1da177e4
LT		 3814 result = L2CAP_CR_NO_MEM;
3815
2dfa1003
GP		 3816 /* Check if we already have channel with that dcid */
3817 if (__l2cap_get_chan_by_dcid(conn, scid))
3818 goto response;
3819
80b98027 3820 chan = pchan->ops->new_connection(pchan);
80808e43 3821 if (!chan)
1da177e4
LT		 3822 goto response;
3823
330b6c15
SS		 3824 /* For certain devices (ex: HID mouse), support for authentication,
3825 * pairing and bonding is optional. For such devices, inorder to avoid
3826 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3827 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3828 */
3829 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3830
7eafc59e
MH		 3831 bacpy(&chan->src, &conn->hcon->src);
3832 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 3833 chan->src_type = bdaddr_src_type(conn->hcon);
3834 chan->dst_type = bdaddr_dst_type(conn->hcon);
fe4128e0
GP		 3835 chan->psm = psm;
3836 chan->dcid = scid;
1700915f 3837 chan->local_amp_id = amp_id;
1da177e4 3838
6be36555 3839 __l2cap_chan_add(conn, chan);
48454079 3840
fe4128e0 3841 dcid = chan->scid;
1da177e4 3842
8d836d71 3843 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3844
fc7f8a7e 3845 chan->ident = cmd->ident;
1da177e4 3846
984947dc 3847 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
e7cafc45 3848 if (l2cap_chan_check_security(chan, false)) {
bdc25783 3849 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3850 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3851 result = L2CAP_CR_PEND;
3852 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3853 chan->ops->defer(chan);
f66dc81f 3854 } else {
1700915f
MM		 3855 /* Force pending result for AMP controllers.
3856 * The connection will succeed after the
3857 * physical link is up.
3858 */
6ed971ca 3859 if (amp_id == AMP_ID_BREDR) {
f93fa273 3860 l2cap_state_change(chan, BT_CONFIG);
1700915f 3861 result = L2CAP_CR_SUCCESS;
6ed971ca 3862 } else {
f93fa273 3863 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3864 result = L2CAP_CR_PEND;
1700915f 3865 }
f66dc81f
MH		 3866 status = L2CAP_CS_NO_INFO;
3867 }
79d554a6 3868 } else {
f93fa273 3869 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3870 result = L2CAP_CR_PEND;
3871 status = L2CAP_CS_AUTHEN_PEND;
3872 }
3873 } else {
f93fa273 3874 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3875 result = L2CAP_CR_PEND;
3876 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3877 }
3878
1da177e4 3879response:
8ffb9290 3880 l2cap_chan_unlock(pchan);
3df91ea2 3881 mutex_unlock(&conn->chan_lock);
a24cce14 3882 l2cap_chan_put(pchan);
1da177e4
LT		 3883
3884sendresp:
aca3192c
YH		 3885 rsp.scid = cpu_to_le16(scid);
3886 rsp.dcid = cpu_to_le16(dcid);
3887 rsp.result = cpu_to_le16(result);
3888 rsp.status = cpu_to_le16(status);
4c89b6aa 3889 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3890
3891 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3892 struct l2cap_info_req info;
dcf4adbf 3893 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3894
3895 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3896 conn->info_ident = l2cap_get_ident(conn);
3897
ba13ccd9 3898 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3899
2d792818
GP		 3900 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3901 sizeof(info), &info);
79d554a6
MH		 3902 }
3903
c1360a1c 3904 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3905 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3906 u8 buf[128];
c1360a1c 3907 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3908 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
8cb091c6 3909 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
73ffa904 3910 chan->num_conf_req++;
e9aeb2dd 3911 }
1700915f
MM		 3912
3913 return chan;
4c89b6aa 3914}
e9aeb2dd 3915
4c89b6aa 3916static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3917 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3918{
7b064eda
JK		 3919 struct hci_dev *hdev = conn->hcon->hdev;
3920 struct hci_conn *hcon = conn->hcon;
3921
cb3b3152
JH		 3922 if (cmd_len < sizeof(struct l2cap_conn_req))
3923 return -EPROTO;
3924
7b064eda 3925 hci_dev_lock(hdev);
d7a5a11d 3926 if (hci_dev_test_flag(hdev, HCI_MGMT) &&
7b064eda 3927 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
48ec92fa 3928 mgmt_device_connected(hdev, hcon, 0, NULL, 0);
7b064eda
JK		 3929 hci_dev_unlock(hdev);
3930
300229f9 3931 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3932 return 0;
3933}
3934
5909cf30 3935static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3936 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3937 u8 *data)
1da177e4
LT		 3938{
3939 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3940 u16 scid, dcid, result, status;
48454079 3941 struct l2cap_chan *chan;
1da177e4 3942 u8 req[128];
3df91ea2 3943 int err;
1da177e4 3944
cb3b3152
JH		 3945 if (cmd_len < sizeof(*rsp))
3946 return -EPROTO;
3947
1da177e4
LT		 3948 scid = __le16_to_cpu(rsp->scid);
3949 dcid = __le16_to_cpu(rsp->dcid);
3950 result = __le16_to_cpu(rsp->result);
3951 status = __le16_to_cpu(rsp->status);
3952
1b009c98 3953 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3954 dcid, scid, result, status);
1da177e4 3955
3df91ea2
AE		 3956 mutex_lock(&conn->chan_lock);
3957
1da177e4 3958 if (scid) {
3df91ea2
AE		 3959 chan = __l2cap_get_chan_by_scid(conn, scid);
3960 if (!chan) {
21870b52 3961 err = -EBADSLT;
3df91ea2
AE		 3962 goto unlock;
3963 }
1da177e4 3964 } else {
3df91ea2
AE		 3965 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3966 if (!chan) {
21870b52 3967 err = -EBADSLT;
3df91ea2
AE		 3968 goto unlock;
3969 }
1da177e4
LT		 3970 }
3971
3df91ea2
AE		 3972 err = 0;
3973
6be36555 3974 l2cap_chan_lock(chan);
48454079 3975
1da177e4
LT		 3976 switch (result) {
3977 case L2CAP_CR_SUCCESS:
89bc500e 3978 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3979 chan->ident = 0;
fe4128e0 3980 chan->dcid = dcid;
c1360a1c 3981 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3982
c1360a1c 3983 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3984 break;
3985
1da177e4 3986 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
8cb091c6 3987 l2cap_build_conf_req(chan, req, sizeof(req)), req);
73ffa904 3988 chan->num_conf_req++;
1da177e4
LT		 3989 break;
3990
3991 case L2CAP_CR_PEND:
c1360a1c 3992 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3993 break;
3994
3995 default:
48454079 3996 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3997 break;
3998 }
3999
6be36555 4000 l2cap_chan_unlock(chan);
3df91ea2
AE		 4001
4002unlock:
4003 mutex_unlock(&conn->chan_lock);
4004
4005 return err;
1da177e4
LT		 4006}
4007
47d1ec61 4008static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 4009{
4010 /* FCS is enabled only in ERTM or streaming mode, if one or both
4011 * sides request it.
4012 */
0c1bc5c6 4013 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 4014 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 4015 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 4016 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 4017}
4018
29d8a590
AE		 4019static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
4020 u8 ident, u16 flags)
4021{
4022 struct l2cap_conn *conn = chan->conn;
4023
4024 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
4025 flags);
4026
4027 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
4028 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
4029
4030 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4031 l2cap_build_conf_rsp(chan, data,
4032 L2CAP_CONF_SUCCESS, flags), data);
4033}
4034
662d652d
JH		 4035static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4036 u16 scid, u16 dcid)
4037{
4038 struct l2cap_cmd_rej_cid rej;
4039
dcf4adbf 4040 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
662d652d
JH		 4041 rej.scid = __cpu_to_le16(scid);
4042 rej.dcid = __cpu_to_le16(dcid);
4043
4044 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4045}
4046
2d792818
GP		 4047static inline int l2cap_config_req(struct l2cap_conn *conn,
4048 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4049 u8 *data)
1da177e4
LT		 4050{
4051 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4052 u16 dcid, flags;
4053 u8 rsp[64];
48454079 4054 struct l2cap_chan *chan;
3c588192 4055 int len, err = 0;
1da177e4 4056
cb3b3152
JH		 4057 if (cmd_len < sizeof(*req))
4058 return -EPROTO;
4059
1da177e4
LT		 4060 dcid = __le16_to_cpu(req->dcid);
4061 flags = __le16_to_cpu(req->flags);
4062
4063 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4064
baa7e1fa 4065 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4066 if (!chan) {
4067 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4068 return 0;
4069 }
1da177e4 4070
033b1142 4071 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4072 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4073 chan->dcid);
354f60a9 4074 goto unlock;
df6bd743 4075 }
354f60a9 4076
5dee9e7c 4077 /* Reject if config buffer is too small. */
88219a0f 4078 len = cmd_len - sizeof(*req);
cb3b3152 4079 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4080 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4081 l2cap_build_conf_rsp(chan, rsp,
4082 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4083 goto unlock;
4084 }
4085
4086 /* Store config. */
73ffa904
GP		 4087 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4088 chan->conf_len += len;
1da177e4 4089
59e54bd1 4090 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4091 /* Incomplete config. Send empty response. */
4092 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4093 l2cap_build_conf_rsp(chan, rsp,
4094 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4095 goto unlock;
4096 }
4097
4098 /* Complete config. */
8cb091c6 4099 len = l2cap_parse_conf_req(chan, rsp, sizeof(rsp));
f2fcfcd6 4100 if (len < 0) {
5e4e3972 4101 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4102 goto unlock;
f2fcfcd6 4103 }
1da177e4 4104
1500109b 4105 chan->ident = cmd->ident;
5dee9e7c 4106 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4107 chan->num_conf_rsp++;
5dee9e7c 4108
5dee9e7c 4109 /* Reset config buffer. */
73ffa904 4110 chan->conf_len = 0;
5dee9e7c 4111
c1360a1c 4112 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4113 goto unlock;
4114
c1360a1c 4115 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4116 set_default_fcs(chan);
fcc203c3 4117
105bdf9e
MM		 4118 if (chan->mode == L2CAP_MODE_ERTM ||
4119 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4120 err = l2cap_ertm_init(chan);
4121
4122 if (err < 0)
5e4e3972 4123 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4124 else
4125 l2cap_chan_ready(chan);
0565c1c2 4126
876d9484
MH		 4127 goto unlock;
4128 }
4129
c1360a1c 4130 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4131 u8 buf[64];
1da177e4 4132 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
8cb091c6 4133 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
73ffa904 4134 chan->num_conf_req++;
1da177e4
LT		 4135 }
4136
49c922bb 4137 /* Got Conf Rsp PENDING from remote side and assume we sent
0e8b207e
AE		 4138 Conf Rsp PENDING in the code above */
4139 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4140 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4141
4142 /* check compatibility */
4143
79de886d 4144 /* Send rsp for BR/EDR channel */
f351bc72 4145 if (!chan->hs_hcon)
79de886d
AE		 4146 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4147 else
4148 chan->ident = cmd->ident;
0e8b207e
AE		 4149 }
4150
1da177e4 4151unlock:
6be36555 4152 l2cap_chan_unlock(chan);
3c588192 4153 return err;
1da177e4
LT		 4154}
4155
2d792818 4156static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4157 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4158 u8 *data)
1da177e4
LT		 4159{
4160 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4161 u16 scid, flags, result;
48454079 4162 struct l2cap_chan *chan;
cb3b3152 4163 int len = cmd_len - sizeof(*rsp);
3c588192 4164 int err = 0;
1da177e4 4165
cb3b3152
JH		 4166 if (cmd_len < sizeof(*rsp))
4167 return -EPROTO;
4168
1da177e4
LT		 4169 scid = __le16_to_cpu(rsp->scid);
4170 flags = __le16_to_cpu(rsp->flags);
4171 result = __le16_to_cpu(rsp->result);
4172
61386cba
AE		 4173 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4174 result, len);
1da177e4 4175
baa7e1fa 4176 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4177 if (!chan)
1da177e4
LT		 4178 return 0;
4179
4180 switch (result) {
4181 case L2CAP_CONF_SUCCESS:
47d1ec61 4182 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4183 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4184 break;
4185
0e8b207e
AE		 4186 case L2CAP_CONF_PENDING:
4187 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4188
4189 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4190 char buf[64];
4191
4192 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
8cb091c6 4193 buf, sizeof(buf), &result);
0e8b207e 4194 if (len < 0) {
5e4e3972 4195 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4196 goto done;
4197 }
4198
f351bc72 4199 if (!chan->hs_hcon) {
79de886d
AE		 4200 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4201 0);
5ce66b59
AE		 4202 } else {
4203 if (l2cap_check_efs(chan)) {
4204 amp_create_logical_link(chan);
4205 chan->ident = cmd->ident;
4206 }
4207 }
0e8b207e
AE		 4208 }
4209 goto done;
4210
1da177e4 4211 case L2CAP_CONF_UNACCEPT:
73ffa904 4212 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4213 char req[64];
4214
c2c77ec8 4215 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4216 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4217 goto done;
4218 }
4219
f2fcfcd6
GP		 4220 /* throw out any old stored conf requests */
4221 result = L2CAP_CONF_SUCCESS;
b4450035 4222 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
8cb091c6 4223 req, sizeof(req), &result);
f2fcfcd6 4224 if (len < 0) {
5e4e3972 4225 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4226 goto done;
4227 }
4228
4229 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4230 L2CAP_CONF_REQ, len, req);
73ffa904 4231 chan->num_conf_req++;
f2fcfcd6
GP		 4232 if (result != L2CAP_CONF_SUCCESS)
4233 goto done;
4234 break;
1da177e4
LT		 4235 }
4236
8e87d142 4237 default:
6be36555 4238 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4239
ba13ccd9 4240 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4241 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4242 goto done;
4243 }
4244
59e54bd1 4245 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4246 goto done;
4247
c1360a1c 4248 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4249
c1360a1c 4250 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4251 set_default_fcs(chan);
fcc203c3 4252
105bdf9e
MM		 4253 if (chan->mode == L2CAP_MODE_ERTM ||
4254 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4255 err = l2cap_ertm_init(chan);
0565c1c2 4256
3c588192 4257 if (err < 0)
5e4e3972 4258 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4259 else
4260 l2cap_chan_ready(chan);
1da177e4
LT		 4261 }
4262
4263done:
6be36555 4264 l2cap_chan_unlock(chan);
3c588192 4265 return err;
1da177e4
LT		 4266}
4267
2d792818 4268static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4269 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4270 u8 *data)
1da177e4
LT		 4271{
4272 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4273 struct l2cap_disconn_rsp rsp;
4274 u16 dcid, scid;
48454079 4275 struct l2cap_chan *chan;
1da177e4 4276
cb3b3152
JH		 4277 if (cmd_len != sizeof(*req))
4278 return -EPROTO;
4279
1da177e4
LT		 4280 scid = __le16_to_cpu(req->scid);
4281 dcid = __le16_to_cpu(req->dcid);
4282
4283 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4284
3df91ea2
AE		 4285 mutex_lock(&conn->chan_lock);
4286
4287 chan = __l2cap_get_chan_by_scid(conn, dcid);
4288 if (!chan) {
4289 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4290 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4291 return 0;
3df91ea2 4292 }
1da177e4 4293
6be36555
AE		 4294 l2cap_chan_lock(chan);
4295
fe4128e0
GP		 4296 rsp.dcid = cpu_to_le16(chan->scid);
4297 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4298 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4299
5ec1bbe5 4300 chan->ops->set_shutdown(chan);
1da177e4 4301
61d6ef3e 4302 l2cap_chan_hold(chan);
48454079 4303 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4304
4305 l2cap_chan_unlock(chan);
1da177e4 4306
80b98027 4307 chan->ops->close(chan);
61d6ef3e 4308 l2cap_chan_put(chan);
3df91ea2
AE		 4309
4310 mutex_unlock(&conn->chan_lock);
4311
1da177e4
LT		 4312 return 0;
4313}
4314
2d792818 4315static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4316 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4317 u8 *data)
1da177e4
LT		 4318{
4319 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4320 u16 dcid, scid;
48454079 4321 struct l2cap_chan *chan;
1da177e4 4322
cb3b3152
JH		 4323 if (cmd_len != sizeof(*rsp))
4324 return -EPROTO;
4325
1da177e4
LT		 4326 scid = __le16_to_cpu(rsp->scid);
4327 dcid = __le16_to_cpu(rsp->dcid);
4328
4329 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4330
3df91ea2
AE		 4331 mutex_lock(&conn->chan_lock);
4332
4333 chan = __l2cap_get_chan_by_scid(conn, scid);
4334 if (!chan) {
4335 mutex_unlock(&conn->chan_lock);
1da177e4 4336 return 0;
3df91ea2 4337 }
1da177e4 4338
6be36555 4339 l2cap_chan_lock(chan);
48454079 4340
61d6ef3e 4341 l2cap_chan_hold(chan);
48454079 4342 l2cap_chan_del(chan, 0);
6be36555
AE		 4343
4344 l2cap_chan_unlock(chan);
1da177e4 4345
80b98027 4346 chan->ops->close(chan);
61d6ef3e 4347 l2cap_chan_put(chan);
3df91ea2
AE		 4348
4349 mutex_unlock(&conn->chan_lock);
4350
1da177e4
LT		 4351 return 0;
4352}
4353
2d792818 4354static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4355 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4356 u8 *data)
1da177e4
LT		 4357{
4358 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4359 u16 type;
4360
cb3b3152
JH		 4361 if (cmd_len != sizeof(*req))
4362 return -EPROTO;
4363
1da177e4
LT		 4364 type = __le16_to_cpu(req->type);
4365
4366 BT_DBG("type 0x%4.4x", type);
4367
f0709e03
MH		 4368 if (type == L2CAP_IT_FEAT_MASK) {
4369 u8 buf[8];
44dd46de 4370 u32 feat_mask = l2cap_feat_mask;
f0709e03 4371 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
dcf4adbf
JP		 4372 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4373 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4374 if (!disable_ertm)
fcc203c3 4375 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4376 | L2CAP_FEAT_FCS;
0bd49fc7 4377 if (conn->local_fixed_chan & L2CAP_FC_A2MP)
6327eb98 4378 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4379 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4380
1b7bf4ed 4381 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4382 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4383 buf);
e1027a7c
MH		 4384 } else if (type == L2CAP_IT_FIXED_CHAN) {
4385 u8 buf[12];
4386 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4387
dcf4adbf
JP		 4388 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4389 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
0bd49fc7
JH		 4390 rsp->data[0] = conn->local_fixed_chan;
4391 memset(rsp->data + 1, 0, 7);
2d792818
GP		 4392 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4393 buf);
f0709e03
MH		 4394 } else {
4395 struct l2cap_info_rsp rsp;
4396 rsp.type = cpu_to_le16(type);
dcf4adbf 4397 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4398 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4399 &rsp);
f0709e03 4400 }
1da177e4
LT		 4401
4402 return 0;
4403}
4404
2d792818 4405static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4406 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4407 u8 *data)
1da177e4
LT		 4408{
4409 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4410 u16 type, result;
4411
3f6fa3d4 4412 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4413 return -EPROTO;
4414
1da177e4
LT		 4415 type = __le16_to_cpu(rsp->type);
4416 result = __le16_to_cpu(rsp->result);
4417
4418 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4419
e90165be
AE		 4420 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4421 if (cmd->ident != conn->info_ident ||
2d792818 4422 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4423 return 0;
4424
17cd3f37 4425 cancel_delayed_work(&conn->info_timer);
4e8402a3 4426
adb08ede
VT		 4427 if (result != L2CAP_IR_SUCCESS) {
4428 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4429 conn->info_ident = 0;
4430
4431 l2cap_conn_start(conn);
4432
4433 return 0;
4434 }
4435
978c93b9
AE		 4436 switch (type) {
4437 case L2CAP_IT_FEAT_MASK:
83985319 4438 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4439
47ec1dcd 4440 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4441 struct l2cap_info_req req;
dcf4adbf 4442 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4443
4444 conn->info_ident = l2cap_get_ident(conn);
4445
4446 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4447 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4448 } else {
4449 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4450 conn->info_ident = 0;
4451
4452 l2cap_conn_start(conn);
4453 }
978c93b9
AE		 4454 break;
4455
4456 case L2CAP_IT_FIXED_CHAN:
0bd49fc7 4457 conn->remote_fixed_chan = rsp->data[0];
984947dc 4458 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4459 conn->info_ident = 0;
984947dc
MH		 4460
4461 l2cap_conn_start(conn);
978c93b9 4462 break;
984947dc 4463 }
4e8402a3 4464
1da177e4
LT		 4465 return 0;
4466}
4467
1700915f
MM		 4468static int l2cap_create_channel_req(struct l2cap_conn *conn,
4469 struct l2cap_cmd_hdr *cmd,
4470 u16 cmd_len, void *data)
f94ff6ff
MM		 4471{
4472 struct l2cap_create_chan_req *req = data;
6e1df6a6 4473 struct l2cap_create_chan_rsp rsp;
1700915f 4474 struct l2cap_chan *chan;
6e1df6a6 4475 struct hci_dev *hdev;
f94ff6ff
MM		 4476 u16 psm, scid;
4477
4478 if (cmd_len != sizeof(*req))
4479 return -EPROTO;
4480
0bd49fc7 4481 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
f94ff6ff
MM		 4482 return -EINVAL;
4483
4484 psm = le16_to_cpu(req->psm);
4485 scid = le16_to_cpu(req->scid);
4486
ad0ac6ca 4487 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4488
6e1df6a6 4489 /* For controller id 0 make BR/EDR connection */
6ed971ca 4490 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4491 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4492 req->amp_id);
4493 return 0;
4494 }
1700915f 4495
6e1df6a6
AE		 4496 /* Validate AMP controller id */
4497 hdev = hci_dev_get(req->amp_id);
4498 if (!hdev)
4499 goto error;
1700915f 4500
6e1df6a6
AE		 4501 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4502 hci_dev_put(hdev);
4503 goto error;
4504 }
1700915f 4505
6e1df6a6
AE		 4506 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4507 req->amp_id);
4508 if (chan) {
4509 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4510 struct hci_conn *hs_hcon;
1700915f 4511
98e0f7ea
MH		 4512 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4513 &conn->hcon->dst);
6e1df6a6
AE		 4514 if (!hs_hcon) {
4515 hci_dev_put(hdev);
662d652d
JH		 4516 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4517 chan->dcid);
4518 return 0;
1700915f
MM		 4519 }
4520
6e1df6a6
AE		 4521 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4522
6e1df6a6
AE		 4523 mgr->bredr_chan = chan;
4524 chan->hs_hcon = hs_hcon;
fd45bf4c 4525 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4526 conn->mtu = hdev->block_mtu;
1700915f 4527 }
f94ff6ff 4528
6e1df6a6 4529 hci_dev_put(hdev);
f94ff6ff
MM		 4530
4531 return 0;
6e1df6a6
AE		 4532
4533error:
4534 rsp.dcid = 0;
4535 rsp.scid = cpu_to_le16(scid);
dcf4adbf
JP		 4536 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4537 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
6e1df6a6
AE		 4538
4539 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4540 sizeof(rsp), &rsp);
4541
dc280801 4542 return 0;
f94ff6ff
MM		 4543}
4544
8eb200bd
MM		 4545static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4546{
4547 struct l2cap_move_chan_req req;
4548 u8 ident;
4549
4550 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4551
4552 ident = l2cap_get_ident(chan->conn);
4553 chan->ident = ident;
4554
4555 req.icid = cpu_to_le16(chan->scid);
4556 req.dest_amp_id = dest_amp_id;
4557
4558 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4559 &req);
4560
4561 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4562}
4563
1500109b 4564static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4565{
4566 struct l2cap_move_chan_rsp rsp;
4567
1500109b 4568 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4569
1500109b 4570 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4571 rsp.result = cpu_to_le16(result);
4572
1500109b
MM		 4573 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4574 sizeof(rsp), &rsp);
8d5a04a1
MM		 4575}
4576
5b155ef9 4577static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4578{
4579 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4580
5b155ef9 4581 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4582
5b155ef9 4583 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4584
5b155ef9 4585 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4586 cfm.result = cpu_to_le16(result);
4587
5b155ef9
MM		 4588 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4589 sizeof(cfm), &cfm);
4590
4591 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4592}
4593
4594static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4595{
4596 struct l2cap_move_chan_cfm cfm;
4597
4598 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4599
4600 cfm.icid = cpu_to_le16(icid);
dcf4adbf 4601 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
5b155ef9
MM		 4602
4603 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4604 sizeof(cfm), &cfm);
8d5a04a1
MM		 4605}
4606
4607static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4608 u16 icid)
8d5a04a1
MM		 4609{
4610 struct l2cap_move_chan_cfm_rsp rsp;
4611
ad0ac6ca 4612 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4613
4614 rsp.icid = cpu_to_le16(icid);
4615 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4616}
4617
5f3847a4
MM		 4618static void __release_logical_link(struct l2cap_chan *chan)
4619{
4620 chan->hs_hchan = NULL;
4621 chan->hs_hcon = NULL;
4622
4623 /* Placeholder - release the logical link */
4624}
4625
1500109b
MM		 4626static void l2cap_logical_fail(struct l2cap_chan *chan)
4627{
4628 /* Logical link setup failed */
4629 if (chan->state != BT_CONNECTED) {
4630 /* Create channel failure, disconnect */
5e4e3972 4631 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4632 return;
4633 }
4634
4635 switch (chan->move_role) {
4636 case L2CAP_MOVE_ROLE_RESPONDER:
4637 l2cap_move_done(chan);
4638 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4639 break;
4640 case L2CAP_MOVE_ROLE_INITIATOR:
4641 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4642 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4643 /* Remote has only sent pending or
4644 * success responses, clean up
4645 */
4646 l2cap_move_done(chan);
4647 }
4648
4649 /* Other amp move states imply that the move
4650 * has already aborted
4651 */
4652 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4653 break;
4654 }
4655}
4656
4657static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4658 struct hci_chan *hchan)
4659{
4660 struct l2cap_conf_rsp rsp;
1500109b 4661
336178a3 4662 chan->hs_hchan = hchan;
1500109b
MM		 4663 chan->hs_hcon->l2cap_data = chan->conn;
4664
35ba9561 4665 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4666
4667 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4668 int err;
1500109b
MM		 4669
4670 set_default_fcs(chan);
4671
4672 err = l2cap_ertm_init(chan);
4673 if (err < 0)
5e4e3972 4674 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4675 else
4676 l2cap_chan_ready(chan);
4677 }
4678}
4679
4680static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4681 struct hci_chan *hchan)
4682{
4683 chan->hs_hcon = hchan->conn;
4684 chan->hs_hcon->l2cap_data = chan->conn;
4685
4686 BT_DBG("move_state %d", chan->move_state);
4687
4688 switch (chan->move_state) {
4689 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4690 /* Move confirm will be sent after a success
4691 * response is received
4692 */
4693 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4694 break;
4695 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4696 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4697 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4698 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4699 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4700 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4701 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4702 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4703 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4704 }
4705 break;
4706 default:
4707 /* Move was not in expected state, free the channel */
4708 __release_logical_link(chan);
4709
4710 chan->move_state = L2CAP_MOVE_STABLE;
4711 }
4712}
4713
4714/* Call with chan locked */
27695fb4
AE		 4715void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4716 u8 status)
5b155ef9 4717{
1500109b
MM		 4718 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4719
4720 if (status) {
4721 l2cap_logical_fail(chan);
4722 __release_logical_link(chan);
4723 return;
4724 }
4725
4726 if (chan->state != BT_CONNECTED) {
4727 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4728 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4729 l2cap_logical_finish_create(chan, hchan);
4730 } else {
4731 l2cap_logical_finish_move(chan, hchan);
4732 }
5b155ef9
MM		 4733}
4734
3f7a56c4
MM		 4735void l2cap_move_start(struct l2cap_chan *chan)
4736{
4737 BT_DBG("chan %p", chan);
4738
6ed971ca 4739 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4740 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4741 return;
4742 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4743 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4744 /* Placeholder - start physical link setup */
4745 } else {
4746 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4747 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4748 chan->move_id = 0;
4749 l2cap_move_setup(chan);
4750 l2cap_send_move_chan_req(chan, 0);
4751 }
4752}
4753
8eb200bd
MM		 4754static void l2cap_do_create(struct l2cap_chan *chan, int result,
4755 u8 local_amp_id, u8 remote_amp_id)
4756{
62748ca1
AE		 4757 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4758 local_amp_id, remote_amp_id);
4759
12d6cc60
AE		 4760 chan->fcs = L2CAP_FCS_NONE;
4761
62748ca1
AE		 4762 /* Outgoing channel on AMP */
4763 if (chan->state == BT_CONNECT) {
4764 if (result == L2CAP_CR_SUCCESS) {
4765 chan->local_amp_id = local_amp_id;
4766 l2cap_send_create_chan_req(chan, remote_amp_id);
4767 } else {
4768 /* Revert to BR/EDR connect */
4769 l2cap_send_conn_req(chan);
4770 }
4771
4772 return;
4773 }
4774
4775 /* Incoming channel on AMP */
4776 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4777 struct l2cap_conn_rsp rsp;
4778 char buf[128];
4779 rsp.scid = cpu_to_le16(chan->dcid);
4780 rsp.dcid = cpu_to_le16(chan->scid);
4781
8eb200bd
MM		 4782 if (result == L2CAP_CR_SUCCESS) {
4783 /* Send successful response */
dcf4adbf
JP		 4784 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4785 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4786 } else {
4787 /* Send negative response */
dcf4adbf
JP		 4788 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4789 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4790 }
4791
4792 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4793 sizeof(rsp), &rsp);
4794
4795 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4796 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4797 set_bit(CONF_REQ_SENT, &chan->conf_state);
4798 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4799 L2CAP_CONF_REQ,
8cb091c6 4800 l2cap_build_conf_req(chan, buf, sizeof(buf)), buf);
8eb200bd
MM		 4801 chan->num_conf_req++;
4802 }
8eb200bd
MM		 4803 }
4804}
4805
4806static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4807 u8 remote_amp_id)
4808{
4809 l2cap_move_setup(chan);
4810 chan->move_id = local_amp_id;
4811 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4812
4813 l2cap_send_move_chan_req(chan, remote_amp_id);
4814}
4815
4816static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4817{
4818 struct hci_chan *hchan = NULL;
4819
4820 /* Placeholder - get hci_chan for logical link */
4821
4822 if (hchan) {
4823 if (hchan->state == BT_CONNECTED) {
4824 /* Logical link is ready to go */
4825 chan->hs_hcon = hchan->conn;
4826 chan->hs_hcon->l2cap_data = chan->conn;
4827 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4828 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4829
4830 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4831 } else {
4832 /* Wait for logical link to be ready */
4833 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4834 }
4835 } else {
4836 /* Logical link not available */
4837 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4838 }
4839}
4840
4841static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4842{
4843 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4844 u8 rsp_result;
4845 if (result == -EINVAL)
4846 rsp_result = L2CAP_MR_BAD_ID;
4847 else
4848 rsp_result = L2CAP_MR_NOT_ALLOWED;
4849
4850 l2cap_send_move_chan_rsp(chan, rsp_result);
4851 }
4852
4853 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4854 chan->move_state = L2CAP_MOVE_STABLE;
4855
4856 /* Restart data transmission */
4857 l2cap_ertm_send(chan);
4858}
4859
a514b17f
AE		 4860/* Invoke with locked chan */
4861void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4862{
770bfefa 4863 u8 local_amp_id = chan->local_amp_id;
fffadc08 4864 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4865
8eb200bd
MM		 4866 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4867 chan, result, local_amp_id, remote_amp_id);
4868
8eb200bd
MM		 4869 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4870 l2cap_chan_unlock(chan);
4871 return;
4872 }
4873
4874 if (chan->state != BT_CONNECTED) {
4875 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4876 } else if (result != L2CAP_MR_SUCCESS) {
4877 l2cap_do_move_cancel(chan, result);
4878 } else {
4879 switch (chan->move_role) {
4880 case L2CAP_MOVE_ROLE_INITIATOR:
4881 l2cap_do_move_initiate(chan, local_amp_id,
4882 remote_amp_id);
4883 break;
4884 case L2CAP_MOVE_ROLE_RESPONDER:
4885 l2cap_do_move_respond(chan, result);
4886 break;
4887 default:
4888 l2cap_do_move_cancel(chan, result);
4889 break;
4890 }
4891 }
8eb200bd
MM		 4892}
4893
8d5a04a1 4894static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4895 struct l2cap_cmd_hdr *cmd,
4896 u16 cmd_len, void *data)
8d5a04a1
MM		 4897{
4898 struct l2cap_move_chan_req *req = data;
1500109b 4899 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4900 struct l2cap_chan *chan;
8d5a04a1
MM		 4901 u16 icid = 0;
4902 u16 result = L2CAP_MR_NOT_ALLOWED;
4903
4904 if (cmd_len != sizeof(*req))
4905 return -EPROTO;
4906
4907 icid = le16_to_cpu(req->icid);
4908
ad0ac6ca 4909 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4910
0bd49fc7 4911 if (!(conn->local_fixed_chan & L2CAP_FC_A2MP))
8d5a04a1
MM		 4912 return -EINVAL;
4913
02b0fbb9
MM		 4914 chan = l2cap_get_chan_by_dcid(conn, icid);
4915 if (!chan) {
1500109b 4916 rsp.icid = cpu_to_le16(icid);
dcf4adbf 4917 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
1500109b
MM		 4918 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4919 sizeof(rsp), &rsp);
02b0fbb9
MM		 4920 return 0;
4921 }
4922
1500109b
MM		 4923 chan->ident = cmd->ident;
4924
02b0fbb9
MM		 4925 if (chan->scid < L2CAP_CID_DYN_START ||
4926 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4927 (chan->mode != L2CAP_MODE_ERTM &&
4928 chan->mode != L2CAP_MODE_STREAMING)) {
4929 result = L2CAP_MR_NOT_ALLOWED;
4930 goto send_move_response;
4931 }
4932
4933 if (chan->local_amp_id == req->dest_amp_id) {
4934 result = L2CAP_MR_SAME_ID;
4935 goto send_move_response;
4936 }
4937
6ed971ca 4938 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4939 struct hci_dev *hdev;
4940 hdev = hci_dev_get(req->dest_amp_id);
4941 if (!hdev || hdev->dev_type != HCI_AMP ||
4942 !test_bit(HCI_UP, &hdev->flags)) {
4943 if (hdev)
4944 hci_dev_put(hdev);
4945
4946 result = L2CAP_MR_BAD_ID;
4947 goto send_move_response;
4948 }
4949 hci_dev_put(hdev);
4950 }
4951
4952 /* Detect a move collision. Only send a collision response
4953 * if this side has "lost", otherwise proceed with the move.
4954 * The winner has the larger bd_addr.
4955 */
4956 if ((__chan_is_moving(chan) ||
4957 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4958 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4959 result = L2CAP_MR_COLLISION;
4960 goto send_move_response;
4961 }
4962
02b0fbb9
MM		 4963 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4964 l2cap_move_setup(chan);
4965 chan->move_id = req->dest_amp_id;
4966 icid = chan->dcid;
4967
6ed971ca 4968 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4969 /* Moving to BR/EDR */
4970 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4971 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4972 result = L2CAP_MR_PEND;
4973 } else {
4974 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4975 result = L2CAP_MR_SUCCESS;
4976 }
4977 } else {
4978 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4979 /* Placeholder - uncomment when amp functions are available */
4980 /*amp_accept_physical(chan, req->dest_amp_id);*/
4981 result = L2CAP_MR_PEND;
4982 }
4983
4984send_move_response:
1500109b 4985 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4986
02b0fbb9
MM		 4987 l2cap_chan_unlock(chan);
4988
8d5a04a1
MM		 4989 return 0;
4990}
4991
5b155ef9
MM		 4992static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4993{
4994 struct l2cap_chan *chan;
4995 struct hci_chan *hchan = NULL;
4996
4997 chan = l2cap_get_chan_by_scid(conn, icid);
4998 if (!chan) {
4999 l2cap_send_move_chan_cfm_icid(conn, icid);
5000 return;
5001 }
5002
5003 __clear_chan_timer(chan);
5004 if (result == L2CAP_MR_PEND)
5005 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
5006
5007 switch (chan->move_state) {
5008 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
5009 /* Move confirm will be sent when logical link
5010 * is complete.
5011 */
5012 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5013 break;
5014 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
5015 if (result == L2CAP_MR_PEND) {
5016 break;
5017 } else if (test_bit(CONN_LOCAL_BUSY,
5018 &chan->conn_state)) {
5019 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
5020 } else {
5021 /* Logical link is up or moving to BR/EDR,
5022 * proceed with move
5023 */
5024 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
5025 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5026 }
5027 break;
5028 case L2CAP_MOVE_WAIT_RSP:
5029 /* Moving to AMP */
5030 if (result == L2CAP_MR_SUCCESS) {
5031 /* Remote is ready, send confirm immediately
5032 * after logical link is ready
5033 */
5034 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5035 } else {
5036 /* Both logical link and move success
5037 * are required to confirm
5038 */
5039 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5040 }
5041
5042 /* Placeholder - get hci_chan for logical link */
5043 if (!hchan) {
5044 /* Logical link not available */
5045 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5046 break;
5047 }
5048
5049 /* If the logical link is not yet connected, do not
5050 * send confirmation.
5051 */
5052 if (hchan->state != BT_CONNECTED)
5053 break;
5054
5055 /* Logical link is already ready to go */
5056
5057 chan->hs_hcon = hchan->conn;
5058 chan->hs_hcon->l2cap_data = chan->conn;
5059
5060 if (result == L2CAP_MR_SUCCESS) {
5061 /* Can confirm now */
5062 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5063 } else {
5064 /* Now only need move success
5065 * to confirm
5066 */
5067 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5068 }
5069
5070 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5071 break;
5072 default:
5073 /* Any other amp move state means the move failed. */
5074 chan->move_id = chan->local_amp_id;
5075 l2cap_move_done(chan);
5076 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5077 }
5078
5079 l2cap_chan_unlock(chan);
5080}
5081
5082static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5083 u16 result)
5084{
5085 struct l2cap_chan *chan;
5086
5087 chan = l2cap_get_chan_by_ident(conn, ident);
5088 if (!chan) {
5089 /* Could not locate channel, icid is best guess */
5090 l2cap_send_move_chan_cfm_icid(conn, icid);
5091 return;
5092 }
5093
5094 __clear_chan_timer(chan);
5095
5096 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5097 if (result == L2CAP_MR_COLLISION) {
5098 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5099 } else {
5100 /* Cleanup - cancel move */
5101 chan->move_id = chan->local_amp_id;
5102 l2cap_move_done(chan);
5103 }
5104 }
5105
5106 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5107
5108 l2cap_chan_unlock(chan);
5109}
5110
5111static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5112 struct l2cap_cmd_hdr *cmd,
5113 u16 cmd_len, void *data)
8d5a04a1
MM		 5114{
5115 struct l2cap_move_chan_rsp *rsp = data;
5116 u16 icid, result;
5117
5118 if (cmd_len != sizeof(*rsp))
5119 return -EPROTO;
5120
5121 icid = le16_to_cpu(rsp->icid);
5122 result = le16_to_cpu(rsp->result);
5123
ad0ac6ca 5124 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5125
5b155ef9
MM		 5126 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5127 l2cap_move_continue(conn, icid, result);
5128 else
5129 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5130
5131 return 0;
5132}
5133
5f3847a4
MM		 5134static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5135 struct l2cap_cmd_hdr *cmd,
5136 u16 cmd_len, void *data)
8d5a04a1
MM		 5137{
5138 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5139 struct l2cap_chan *chan;
8d5a04a1
MM		 5140 u16 icid, result;
5141
5142 if (cmd_len != sizeof(*cfm))
5143 return -EPROTO;
5144
5145 icid = le16_to_cpu(cfm->icid);
5146 result = le16_to_cpu(cfm->result);
5147
ad0ac6ca 5148 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5149
5f3847a4
MM		 5150 chan = l2cap_get_chan_by_dcid(conn, icid);
5151 if (!chan) {
5152 /* Spec requires a response even if the icid was not found */
5153 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5154 return 0;
5155 }
5156
5157 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5158 if (result == L2CAP_MC_CONFIRMED) {
5159 chan->local_amp_id = chan->move_id;
6ed971ca 5160 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5161 __release_logical_link(chan);
5162 } else {
5163 chan->move_id = chan->local_amp_id;
5164 }
5165
5166 l2cap_move_done(chan);
5167 }
5168
8d5a04a1
MM		 5169 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5170
5f3847a4
MM		 5171 l2cap_chan_unlock(chan);
5172
8d5a04a1
MM		 5173 return 0;
5174}
5175
5176static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5177 struct l2cap_cmd_hdr *cmd,
5178 u16 cmd_len, void *data)
8d5a04a1
MM		 5179{
5180 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5181 struct l2cap_chan *chan;
8d5a04a1
MM		 5182 u16 icid;
5183
5184 if (cmd_len != sizeof(*rsp))
5185 return -EPROTO;
5186
5187 icid = le16_to_cpu(rsp->icid);
5188
ad0ac6ca 5189 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5190
3fd71a0a
MM		 5191 chan = l2cap_get_chan_by_scid(conn, icid);
5192 if (!chan)
5193 return 0;
5194
5195 __clear_chan_timer(chan);
5196
5197 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5198 chan->local_amp_id = chan->move_id;
5199
6ed971ca 5200 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5201 __release_logical_link(chan);
5202
5203 l2cap_move_done(chan);
5204 }
5205
5206 l2cap_chan_unlock(chan);
5207
8d5a04a1
MM		 5208 return 0;
5209}
5210
de73115a 5211static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5212 struct l2cap_cmd_hdr *cmd,
203e639e 5213 u16 cmd_len, u8 *data)
de73115a
CT		 5214{
5215 struct hci_conn *hcon = conn->hcon;
5216 struct l2cap_conn_param_update_req *req;
5217 struct l2cap_conn_param_update_rsp rsp;
203e639e 5218 u16 min, max, latency, to_multiplier;
2ce603eb 5219 int err;
de73115a 5220
40bef302 5221 if (hcon->role != HCI_ROLE_MASTER)
de73115a
CT		 5222 return -EINVAL;
5223
de73115a
CT		 5224 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5225 return -EPROTO;
5226
5227 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5228 min = __le16_to_cpu(req->min);
5229 max = __le16_to_cpu(req->max);
de73115a
CT		 5230 latency = __le16_to_cpu(req->latency);
5231 to_multiplier = __le16_to_cpu(req->to_multiplier);
5232
5233 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5234 min, max, latency, to_multiplier);
de73115a
CT		 5235
5236 memset(&rsp, 0, sizeof(rsp));
2ce603eb 5237
d4905f24 5238 err = hci_check_conn_params(min, max, latency, to_multiplier);
2ce603eb 5239 if (err)
dcf4adbf 5240 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5241 else
dcf4adbf 5242 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5243
5244 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5245 sizeof(rsp), &rsp);
de73115a 5246
ffb5a827 5247 if (!err) {
f4869e2a
JH		 5248 u8 store_hint;
5249
5250 store_hint = hci_le_conn_update(hcon, min, max, latency,
5251 to_multiplier);
ffb5a827 5252 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
f4869e2a
JH		 5253 store_hint, min, max, latency,
5254 to_multiplier);
ffb5a827 5255
ffb5a827 5256 }
2ce603eb 5257
de73115a
CT		 5258 return 0;
5259}
5260
f1496dee
JH		 5261static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5262 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5263 u8 *data)
5264{
5265 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
3e64b7bd 5266 struct hci_conn *hcon = conn->hcon;
f1496dee
JH		 5267 u16 dcid, mtu, mps, credits, result;
5268 struct l2cap_chan *chan;
3e64b7bd 5269 int err, sec_level;
f1496dee
JH		 5270
5271 if (cmd_len < sizeof(*rsp))
5272 return -EPROTO;
5273
5274 dcid = __le16_to_cpu(rsp->dcid);
5275 mtu = __le16_to_cpu(rsp->mtu);
5276 mps = __le16_to_cpu(rsp->mps);
5277 credits = __le16_to_cpu(rsp->credits);
5278 result = __le16_to_cpu(rsp->result);
5279
40624183
JH		 5280 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23 ||
5281 dcid < L2CAP_CID_DYN_START ||
5282 dcid > L2CAP_CID_LE_DYN_END))
f1496dee
JH		 5283 return -EPROTO;
5284
5285 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5286 dcid, mtu, mps, credits, result);
5287
5288 mutex_lock(&conn->chan_lock);
5289
5290 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5291 if (!chan) {
5292 err = -EBADSLT;
5293 goto unlock;
5294 }
5295
5296 err = 0;
5297
5298 l2cap_chan_lock(chan);
5299
5300 switch (result) {
5301 case L2CAP_CR_SUCCESS:
40624183
JH		 5302 if (__l2cap_get_chan_by_dcid(conn, dcid)) {
5303 err = -EBADSLT;
5304 break;
5305 }
5306
f1496dee
JH		 5307 chan->ident = 0;
5308 chan->dcid = dcid;
5309 chan->omtu = mtu;
5310 chan->remote_mps = mps;
0cd75f7e 5311 chan->tx_credits = credits;
f1496dee
JH		 5312 l2cap_chan_ready(chan);
5313 break;
5314
3e64b7bd
JH		 5315 case L2CAP_CR_AUTHENTICATION:
5316 case L2CAP_CR_ENCRYPTION:
5317 /* If we already have MITM protection we can't do
5318 * anything.
5319 */
5320 if (hcon->sec_level > BT_SECURITY_MEDIUM) {
5321 l2cap_chan_del(chan, ECONNREFUSED);
5322 break;
5323 }
5324
5325 sec_level = hcon->sec_level + 1;
5326 if (chan->sec_level < sec_level)
5327 chan->sec_level = sec_level;
5328
5329 /* We'll need to send a new Connect Request */
5330 clear_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags);
5331
5332 smp_conn_security(hcon, chan->sec_level);
5333 break;
5334
f1496dee
JH		 5335 default:
5336 l2cap_chan_del(chan, ECONNREFUSED);
5337 break;
5338 }
5339
5340 l2cap_chan_unlock(chan);
5341
5342unlock:
5343 mutex_unlock(&conn->chan_lock);
5344
5345 return err;
5346}
5347
3300d9a9 5348static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5349 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5350 u8 *data)
3300d9a9
CT		 5351{
5352 int err = 0;
5353
5354 switch (cmd->code) {
5355 case L2CAP_COMMAND_REJ:
cb3b3152 5356 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5357 break;
5358
5359 case L2CAP_CONN_REQ:
cb3b3152 5360 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5361 break;
5362
5363 case L2CAP_CONN_RSP:
f5a2598d 5364 case L2CAP_CREATE_CHAN_RSP:
9245e737 5365 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5366 break;
5367
5368 case L2CAP_CONF_REQ:
5369 err = l2cap_config_req(conn, cmd, cmd_len, data);
5370 break;
5371
5372 case L2CAP_CONF_RSP:
9245e737 5373 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5374 break;
5375
5376 case L2CAP_DISCONN_REQ:
cb3b3152 5377 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5378 break;
5379
5380 case L2CAP_DISCONN_RSP:
9245e737 5381 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5382 break;
5383
5384 case L2CAP_ECHO_REQ:
5385 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5386 break;
5387
5388 case L2CAP_ECHO_RSP:
5389 break;
5390
5391 case L2CAP_INFO_REQ:
cb3b3152 5392 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5393 break;
5394
5395 case L2CAP_INFO_RSP:
9245e737 5396 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5397 break;
5398
f94ff6ff
MM		 5399 case L2CAP_CREATE_CHAN_REQ:
5400 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5401 break;
5402
8d5a04a1
MM		 5403 case L2CAP_MOVE_CHAN_REQ:
5404 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5405 break;
5406
5407 case L2CAP_MOVE_CHAN_RSP:
9245e737 5408 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5409 break;
5410
5411 case L2CAP_MOVE_CHAN_CFM:
5412 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5413 break;
5414
5415 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5416 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5417 break;
5418
3300d9a9
CT		 5419 default:
5420 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5421 err = -EINVAL;
5422 break;
5423 }
5424
5425 return err;
5426}
5427
27e2d4c8
JH		 5428static int l2cap_le_connect_req(struct l2cap_conn *conn,
5429 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5430 u8 *data)
5431{
5432 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5433 struct l2cap_le_conn_rsp rsp;
5434 struct l2cap_chan *chan, *pchan;
0cd75f7e 5435 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5436 __le16 psm;
5437 u8 result;
5438
5439 if (cmd_len != sizeof(*req))
5440 return -EPROTO;
5441
5442 scid = __le16_to_cpu(req->scid);
5443 mtu = __le16_to_cpu(req->mtu);
5444 mps = __le16_to_cpu(req->mps);
5445 psm = req->psm;
5446 dcid = 0;
0cd75f7e 5447 credits = 0;
27e2d4c8
JH		 5448
5449 if (mtu < 23 || mps < 23)
5450 return -EPROTO;
5451
5452 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5453 scid, mtu, mps);
5454
5455 /* Check if we have socket listening on psm */
5456 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5457 &conn->hcon->dst, LE_LINK);
5458 if (!pchan) {
5459 result = L2CAP_CR_BAD_PSM;
5460 chan = NULL;
5461 goto response;
5462 }
5463
5464 mutex_lock(&conn->chan_lock);
5465 l2cap_chan_lock(pchan);
5466
35dc6f83
JH		 5467 if (!smp_sufficient_security(conn->hcon, pchan->sec_level,
5468 SMP_ALLOW_STK)) {
27e2d4c8
JH		 5469 result = L2CAP_CR_AUTHENTICATION;
5470 chan = NULL;
5471 goto response_unlock;
5472 }
5473
8a7889cc
JH		 5474 /* Check for valid dynamic CID range */
5475 if (scid < L2CAP_CID_DYN_START || scid > L2CAP_CID_LE_DYN_END) {
5476 result = L2CAP_CR_INVALID_SCID;
5477 chan = NULL;
5478 goto response_unlock;
5479 }
5480
27e2d4c8
JH		 5481 /* Check if we already have channel with that dcid */
5482 if (__l2cap_get_chan_by_dcid(conn, scid)) {
8a7889cc 5483 result = L2CAP_CR_SCID_IN_USE;
27e2d4c8
JH		 5484 chan = NULL;
5485 goto response_unlock;
5486 }
5487
5488 chan = pchan->ops->new_connection(pchan);
5489 if (!chan) {
5490 result = L2CAP_CR_NO_MEM;
5491 goto response_unlock;
5492 }
5493
0ce43ce6
JH		 5494 l2cap_le_flowctl_init(chan);
5495
27e2d4c8
JH		 5496 bacpy(&chan->src, &conn->hcon->src);
5497 bacpy(&chan->dst, &conn->hcon->dst);
a250e048
JH		 5498 chan->src_type = bdaddr_src_type(conn->hcon);
5499 chan->dst_type = bdaddr_dst_type(conn->hcon);
27e2d4c8
JH		 5500 chan->psm = psm;
5501 chan->dcid = scid;
5502 chan->omtu = mtu;
5503 chan->remote_mps = mps;
0cd75f7e 5504 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5505
5506 __l2cap_chan_add(conn, chan);
5507 dcid = chan->scid;
0cd75f7e 5508 credits = chan->rx_credits;
27e2d4c8
JH		 5509
5510 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5511
5512 chan->ident = cmd->ident;
5513
5514 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5515 l2cap_state_change(chan, BT_CONNECT2);
434714dc
JH		 5516 /* The following result value is actually not defined
5517 * for LE CoC but we use it to let the function know
5518 * that it should bail out after doing its cleanup
5519 * instead of sending a response.
5520 */
27e2d4c8
JH		 5521 result = L2CAP_CR_PEND;
5522 chan->ops->defer(chan);
5523 } else {
5524 l2cap_chan_ready(chan);
5525 result = L2CAP_CR_SUCCESS;
5526 }
5527
5528response_unlock:
5529 l2cap_chan_unlock(pchan);
5530 mutex_unlock(&conn->chan_lock);
a24cce14 5531 l2cap_chan_put(pchan);
27e2d4c8
JH		 5532
5533 if (result == L2CAP_CR_PEND)
5534 return 0;
5535
5536response:
5537 if (chan) {
5538 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5539 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5540 } else {
5541 rsp.mtu = 0;
5542 rsp.mps = 0;
5543 }
5544
5545 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5546 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5547 rsp.result = cpu_to_le16(result);
5548
5549 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5550
5551 return 0;
5552}
5553
fad5fc89
JH		 5554static inline int l2cap_le_credits(struct l2cap_conn *conn,
5555 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5556 u8 *data)
5557{
5558 struct l2cap_le_credits *pkt;
5559 struct l2cap_chan *chan;
0f1bfe4e 5560 u16 cid, credits, max_credits;
fad5fc89
JH		 5561
5562 if (cmd_len != sizeof(*pkt))
5563 return -EPROTO;
5564
5565 pkt = (struct l2cap_le_credits *) data;
5566 cid = __le16_to_cpu(pkt->cid);
5567 credits = __le16_to_cpu(pkt->credits);
5568
5569 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5570
5571 chan = l2cap_get_chan_by_dcid(conn, cid);
5572 if (!chan)
5573 return -EBADSLT;
5574
0f1bfe4e
JH		 5575 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5576 if (credits > max_credits) {
5577 BT_ERR("LE credits overflow");
5578 l2cap_send_disconn_req(chan, ECONNRESET);
ee93053d 5579 l2cap_chan_unlock(chan);
0f1bfe4e
JH		 5580
5581 /* Return 0 so that we don't trigger an unnecessary
5582 * command reject packet.
5583 */
5584 return 0;
5585 }
5586
fad5fc89
JH		 5587 chan->tx_credits += credits;
5588
8a505b7f
LAD		 5589 /* Resume sending */
5590 l2cap_le_flowctl_send(chan);
fad5fc89
JH		 5591
5592 if (chan->tx_credits)
5593 chan->ops->resume(chan);
5594
5595 l2cap_chan_unlock(chan);
5596
5597 return 0;
5598}
5599
71fb4197
JH		 5600static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5601 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5602 u8 *data)
5603{
5604 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5605 struct l2cap_chan *chan;
5606
5607 if (cmd_len < sizeof(*rej))
5608 return -EPROTO;
5609
5610 mutex_lock(&conn->chan_lock);
5611
5612 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5613 if (!chan)
5614 goto done;
5615
5616 l2cap_chan_lock(chan);
5617 l2cap_chan_del(chan, ECONNREFUSED);
5618 l2cap_chan_unlock(chan);
5619
5620done:
5621 mutex_unlock(&conn->chan_lock);
5622 return 0;
5623}
5624
3300d9a9 5625static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5626 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5627 u8 *data)
3300d9a9 5628{
b5ecba64
JH		 5629 int err = 0;
5630
3300d9a9
CT		 5631 switch (cmd->code) {
5632 case L2CAP_COMMAND_REJ:
71fb4197 5633 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5634 break;
3300d9a9
CT		 5635
5636 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5637 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5638 break;
3300d9a9
CT		 5639
5640 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5641 break;
3300d9a9 5642
f1496dee
JH		 5643 case L2CAP_LE_CONN_RSP:
5644 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5645 break;
f1496dee 5646
27e2d4c8 5647 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5648 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5649 break;
27e2d4c8 5650
fad5fc89
JH		 5651 case L2CAP_LE_CREDITS:
5652 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5653 break;
5654
3defe01a 5655 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5656 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5657 break;
3defe01a
JH		 5658
5659 case L2CAP_DISCONN_RSP:
5660 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5661 break;
3defe01a 5662
3300d9a9
CT		 5663 default:
5664 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5665 err = -EINVAL;
5666 break;
3300d9a9 5667 }
b5ecba64
JH		 5668
5669 return err;
3300d9a9
CT		 5670}
5671
c5623556
JH		 5672static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5673 struct sk_buff *skb)
5674{
69c4e4e8 5675 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5676 struct l2cap_cmd_hdr *cmd;
5677 u16 len;
c5623556
JH		 5678 int err;
5679
69c4e4e8 5680 if (hcon->type != LE_LINK)
3b166295 5681 goto drop;
69c4e4e8 5682
4f3e219d
MH		 5683 if (skb->len < L2CAP_CMD_HDR_SIZE)
5684 goto drop;
c5623556 5685
4f3e219d
MH		 5686 cmd = (void *) skb->data;
5687 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5688
4f3e219d 5689 len = le16_to_cpu(cmd->len);
c5623556 5690
4f3e219d 5691 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5692
4f3e219d
MH		 5693 if (len != skb->len || !cmd->ident) {
5694 BT_DBG("corrupted command");
5695 goto drop;
5696 }
c5623556 5697
203e639e 5698 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5699 if (err) {
5700 struct l2cap_cmd_rej_unk rej;
c5623556 5701
4f3e219d 5702 BT_ERR("Wrong link type (%d)", err);
c5623556 5703
dcf4adbf 5704 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5705 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5706 sizeof(rej), &rej);
c5623556
JH		 5707 }
5708
3b166295 5709drop:
c5623556
JH		 5710 kfree_skb(skb);
5711}
5712
3300d9a9 5713static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5714 struct sk_buff *skb)
1da177e4 5715{
69c4e4e8 5716 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5717 u8 *data = skb->data;
5718 int len = skb->len;
5719 struct l2cap_cmd_hdr cmd;
3300d9a9 5720 int err;
1da177e4
LT		 5721
5722 l2cap_raw_recv(conn, skb);
5723
69c4e4e8 5724 if (hcon->type != ACL_LINK)
3b166295 5725 goto drop;
69c4e4e8 5726
1da177e4 5727 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5728 u16 cmd_len;
1da177e4
LT		 5729 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5730 data += L2CAP_CMD_HDR_SIZE;
5731 len -= L2CAP_CMD_HDR_SIZE;
5732
88219a0f 5733 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5734
2d792818
GP		 5735 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5736 cmd.ident);
1da177e4 5737
88219a0f 5738 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5739 BT_DBG("corrupted command");
5740 break;
5741 }
5742
c5623556 5743 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5744 if (err) {
e2fd318e 5745 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5746
5747 BT_ERR("Wrong link type (%d)", err);
1da177e4 5748
dcf4adbf 5749 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5750 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5751 sizeof(rej), &rej);
1da177e4
LT		 5752 }
5753
88219a0f
AV		 5754 data += cmd_len;
5755 len -= cmd_len;
1da177e4
LT		 5756 }
5757
3b166295 5758drop:
1da177e4
LT		 5759 kfree_skb(skb);
5760}
5761
47d1ec61 5762static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5763{
5764 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5765 int hdr_size;
5766
5767 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5768 hdr_size = L2CAP_EXT_HDR_SIZE;
5769 else
5770 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5771
47d1ec61 5772 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5773 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5774 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5775 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5776
5777 if (our_fcs != rcv_fcs)
7a560e5c 5778 return -EBADMSG;
fcc203c3
GP		 5779 }
5780 return 0;
5781}
5782
6ea00485 5783static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5784{
e31f7633 5785 struct l2cap_ctrl control;
d5392c8f 5786
e31f7633 5787 BT_DBG("chan %p", chan);
d5392c8f 5788
e31f7633
MM		 5789 memset(&control, 0, sizeof(control));
5790 control.sframe = 1;
5791 control.final = 1;
5792 control.reqseq = chan->buffer_seq;
5793 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5794
e2ab4353 5795 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5796 control.super = L2CAP_SUPER_RNR;
5797 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5798 }
5799
e31f7633
MM		 5800 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5801 chan->unacked_frames > 0)
5802 __set_retrans_timer(chan);
d5392c8f 5803
e31f7633 5804 /* Send pending iframes */
525cd185 5805 l2cap_ertm_send(chan);
d5392c8f 5806
e2ab4353 5807 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5808 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5809 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5810 * send it now.
5811 */
5812 control.super = L2CAP_SUPER_RR;
5813 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5814 }
5815}
5816
2d792818
GP		 5817static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5818 struct sk_buff **last_frag)
18778a63 5819{
84084a31
MM		 5820 /* skb->len reflects data in skb as well as all fragments
5821 * skb->data_len reflects only data in fragments
5822 */
5823 if (!skb_has_frag_list(skb))
5824 skb_shinfo(skb)->frag_list = new_frag;
5825
5826 new_frag->next = NULL;
5827
5828 (*last_frag)->next = new_frag;
5829 *last_frag = new_frag;
5830
5831 skb->len += new_frag->len;
5832 skb->data_len += new_frag->len;
5833 skb->truesize += new_frag->truesize;
5834}
5835
4b51dae9
MM		 5836static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5837 struct l2cap_ctrl *control)
84084a31
MM		 5838{
5839 int err = -EINVAL;
18778a63 5840
4b51dae9 5841 switch (control->sar) {
7e0ef6ee 5842 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5843 if (chan->sdu)
5844 break;
18778a63 5845
80b98027 5846 err = chan->ops->recv(chan, skb);
84084a31 5847 break;
18778a63 5848
7e0ef6ee 5849 case L2CAP_SAR_START:
84084a31
MM		 5850 if (chan->sdu)
5851 break;
18778a63 5852
dbb50887
DB		 5853 if (!pskb_may_pull(skb, L2CAP_SDULEN_SIZE))
5854 break;
5855
6f61fd47 5856 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5857 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5858
84084a31
MM		 5859 if (chan->sdu_len > chan->imtu) {
5860 err = -EMSGSIZE;
5861 break;
5862 }
1890d36b 5863
84084a31
MM		 5864 if (skb->len >= chan->sdu_len)
5865 break;
18778a63 5866
84084a31
MM		 5867 chan->sdu = skb;
5868 chan->sdu_last_frag = skb;
18778a63 5869
84084a31
MM		 5870 skb = NULL;
5871 err = 0;
18778a63
GP		 5872 break;
5873
7e0ef6ee 5874 case L2CAP_SAR_CONTINUE:
6f61fd47 5875 if (!chan->sdu)
84084a31 5876 break;
18778a63 5877
84084a31
MM		 5878 append_skb_frag(chan->sdu, skb,
5879 &chan->sdu_last_frag);
5880 skb = NULL;
18778a63 5881
84084a31
MM		 5882 if (chan->sdu->len >= chan->sdu_len)
5883 break;
4178ba46 5884
84084a31 5885 err = 0;
18778a63
GP		 5886 break;
5887
7e0ef6ee 5888 case L2CAP_SAR_END:
6f61fd47 5889 if (!chan->sdu)
84084a31 5890 break;
18778a63 5891
84084a31
MM		 5892 append_skb_frag(chan->sdu, skb,
5893 &chan->sdu_last_frag);
5894 skb = NULL;
4178ba46 5895
84084a31
MM		 5896 if (chan->sdu->len != chan->sdu_len)
5897 break;
18778a63 5898
80b98027 5899 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5900
84084a31
MM		 5901 if (!err) {
5902 /* Reassembly complete */
5903 chan->sdu = NULL;
5904 chan->sdu_last_frag = NULL;
5905 chan->sdu_len = 0;
1890d36b 5906 }
18778a63
GP		 5907 break;
5908 }
5909
84084a31
MM		 5910 if (err) {
5911 kfree_skb(skb);
5912 kfree_skb(chan->sdu);
5913 chan->sdu = NULL;
5914 chan->sdu_last_frag = NULL;
5915 chan->sdu_len = 0;
5916 }
18778a63 5917
84084a31 5918 return err;
18778a63
GP		 5919}
5920
32b32735
MM		 5921static int l2cap_resegment(struct l2cap_chan *chan)
5922{
5923 /* Placeholder */
5924 return 0;
5925}
5926
61aa4f5b 5927void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5928{
61aa4f5b 5929 u8 event;
712132eb 5930
61aa4f5b
MM		 5931 if (chan->mode != L2CAP_MODE_ERTM)
5932 return;
712132eb 5933
61aa4f5b 5934 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5935 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5936}
5937
d2a7ac5d
MM		 5938static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5939{
63838725
MM		 5940 int err = 0;
5941 /* Pass sequential frames to l2cap_reassemble_sdu()
5942 * until a gap is encountered.
5943 */
5944
5945 BT_DBG("chan %p", chan);
5946
5947 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5948 struct sk_buff *skb;
5949 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5950 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5951
5952 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5953
5954 if (!skb)
5955 break;
5956
5957 skb_unlink(skb, &chan->srej_q);
5958 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
a4368ff3 5959 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->l2cap);
63838725
MM		 5960 if (err)
5961 break;
5962 }
5963
5964 if (skb_queue_empty(&chan->srej_q)) {
5965 chan->rx_state = L2CAP_RX_STATE_RECV;
5966 l2cap_send_ack(chan);
5967 }
5968
5969 return err;
d2a7ac5d
MM		 5970}
5971
5972static void l2cap_handle_srej(struct l2cap_chan *chan,
5973 struct l2cap_ctrl *control)
5974{
f80842a8
MM		 5975 struct sk_buff *skb;
5976
5977 BT_DBG("chan %p, control %p", chan, control);
5978
5979 if (control->reqseq == chan->next_tx_seq) {
5980 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5981 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5982 return;
5983 }
5984
5985 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5986
5987 if (skb == NULL) {
5988 BT_DBG("Seq %d not available for retransmission",
5989 control->reqseq);
5990 return;
5991 }
5992
a4368ff3 5993 if (chan->max_tx != 0 && bt_cb(skb)->l2cap.retries >= chan->max_tx) {
f80842a8 5994 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5995 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5996 return;
5997 }
5998
5999 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6000
6001 if (control->poll) {
6002 l2cap_pass_to_tx(chan, control);
6003
6004 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6005 l2cap_retransmit(chan, control);
6006 l2cap_ertm_send(chan);
6007
6008 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
6009 set_bit(CONN_SREJ_ACT, &chan->conn_state);
6010 chan->srej_save_reqseq = control->reqseq;
6011 }
6012 } else {
6013 l2cap_pass_to_tx_fbit(chan, control);
6014
6015 if (control->final) {
6016 if (chan->srej_save_reqseq != control->reqseq ||
6017 !test_and_clear_bit(CONN_SREJ_ACT,
6018 &chan->conn_state))
6019 l2cap_retransmit(chan, control);
6020 } else {
6021 l2cap_retransmit(chan, control);
6022 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
6023 set_bit(CONN_SREJ_ACT, &chan->conn_state);
6024 chan->srej_save_reqseq = control->reqseq;
6025 }
6026 }
6027 }
d2a7ac5d
MM		 6028}
6029
6030static void l2cap_handle_rej(struct l2cap_chan *chan,
6031 struct l2cap_ctrl *control)
6032{
fcd289df
MM		 6033 struct sk_buff *skb;
6034
6035 BT_DBG("chan %p, control %p", chan, control);
6036
6037 if (control->reqseq == chan->next_tx_seq) {
6038 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 6039 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6040 return;
6041 }
6042
6043 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
6044
6045 if (chan->max_tx && skb &&
a4368ff3 6046 bt_cb(skb)->l2cap.retries >= chan->max_tx) {
fcd289df 6047 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 6048 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6049 return;
6050 }
6051
6052 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6053
6054 l2cap_pass_to_tx(chan, control);
6055
6056 if (control->final) {
6057 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6058 l2cap_retransmit_all(chan, control);
6059 } else {
6060 l2cap_retransmit_all(chan, control);
6061 l2cap_ertm_send(chan);
6062 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6063 set_bit(CONN_REJ_ACT, &chan->conn_state);
6064 }
d2a7ac5d
MM		 6065}
6066
4b51dae9
MM		 6067static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6068{
6069 BT_DBG("chan %p, txseq %d", chan, txseq);
6070
6071 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6072 chan->expected_tx_seq);
6073
6074 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6075 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 6076 chan->tx_win) {
4b51dae9
MM		 6077 /* See notes below regarding "double poll" and
6078 * invalid packets.
6079 */
6080 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6081 BT_DBG("Invalid/Ignore - after SREJ");
6082 return L2CAP_TXSEQ_INVALID_IGNORE;
6083 } else {
6084 BT_DBG("Invalid - in window after SREJ sent");
6085 return L2CAP_TXSEQ_INVALID;
6086 }
6087 }
6088
6089 if (chan->srej_list.head == txseq) {
6090 BT_DBG("Expected SREJ");
6091 return L2CAP_TXSEQ_EXPECTED_SREJ;
6092 }
6093
6094 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6095 BT_DBG("Duplicate SREJ - txseq already stored");
6096 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6097 }
6098
6099 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6100 BT_DBG("Unexpected SREJ - not requested");
6101 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6102 }
6103 }
6104
6105 if (chan->expected_tx_seq == txseq) {
6106 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6107 chan->tx_win) {
6108 BT_DBG("Invalid - txseq outside tx window");
6109 return L2CAP_TXSEQ_INVALID;
6110 } else {
6111 BT_DBG("Expected");
6112 return L2CAP_TXSEQ_EXPECTED;
6113 }
6114 }
6115
6116 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6117 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6118 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6119 return L2CAP_TXSEQ_DUPLICATE;
6120 }
6121
6122 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6123 /* A source of invalid packets is a "double poll" condition,
6124 * where delays cause us to send multiple poll packets. If
6125 * the remote stack receives and processes both polls,
6126 * sequence numbers can wrap around in such a way that a
6127 * resent frame has a sequence number that looks like new data
6128 * with a sequence gap. This would trigger an erroneous SREJ
6129 * request.
6130 *
6131 * Fortunately, this is impossible with a tx window that's
6132 * less than half of the maximum sequence number, which allows
6133 * invalid frames to be safely ignored.
6134 *
6135 * With tx window sizes greater than half of the tx window
6136 * maximum, the frame is invalid and cannot be ignored. This
6137 * causes a disconnect.
6138 */
6139
6140 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6141 BT_DBG("Invalid/Ignore - txseq outside tx window");
6142 return L2CAP_TXSEQ_INVALID_IGNORE;
6143 } else {
6144 BT_DBG("Invalid - txseq outside tx window");
6145 return L2CAP_TXSEQ_INVALID;
6146 }
6147 } else {
6148 BT_DBG("Unexpected - txseq indicates missing frames");
6149 return L2CAP_TXSEQ_UNEXPECTED;
6150 }
6151}
6152
d2a7ac5d
MM		 6153static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6154 struct l2cap_ctrl *control,
6155 struct sk_buff *skb, u8 event)
6156{
6157 int err = 0;
941247f9 6158 bool skb_in_use = false;
d2a7ac5d
MM		 6159
6160 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6161 event);
6162
6163 switch (event) {
6164 case L2CAP_EV_RECV_IFRAME:
6165 switch (l2cap_classify_txseq(chan, control->txseq)) {
6166 case L2CAP_TXSEQ_EXPECTED:
6167 l2cap_pass_to_tx(chan, control);
6168
6169 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6170 BT_DBG("Busy, discarding expected seq %d",
6171 control->txseq);
6172 break;
6173 }
6174
6175 chan->expected_tx_seq = __next_seq(chan,
6176 control->txseq);
6177
6178 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6179 skb_in_use = true;
d2a7ac5d
MM		 6180
6181 err = l2cap_reassemble_sdu(chan, skb, control);
6182 if (err)
6183 break;
6184
6185 if (control->final) {
6186 if (!test_and_clear_bit(CONN_REJ_ACT,
6187 &chan->conn_state)) {
6188 control->final = 0;
6189 l2cap_retransmit_all(chan, control);
6190 l2cap_ertm_send(chan);
6191 }
6192 }
6193
6194 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6195 l2cap_send_ack(chan);
6196 break;
6197 case L2CAP_TXSEQ_UNEXPECTED:
6198 l2cap_pass_to_tx(chan, control);
6199
6200 /* Can't issue SREJ frames in the local busy state.
6201 * Drop this frame, it will be seen as missing
6202 * when local busy is exited.
6203 */
6204 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6205 BT_DBG("Busy, discarding unexpected seq %d",
6206 control->txseq);
6207 break;
6208 }
6209
6210 /* There was a gap in the sequence, so an SREJ
6211 * must be sent for each missing frame. The
6212 * current frame is stored for later use.
6213 */
6214 skb_queue_tail(&chan->srej_q, skb);
941247f9 6215 skb_in_use = true;
d2a7ac5d
MM		 6216 BT_DBG("Queued %p (queue len %d)", skb,
6217 skb_queue_len(&chan->srej_q));
6218
6219 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6220 l2cap_seq_list_clear(&chan->srej_list);
6221 l2cap_send_srej(chan, control->txseq);
6222
6223 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6224 break;
6225 case L2CAP_TXSEQ_DUPLICATE:
6226 l2cap_pass_to_tx(chan, control);
6227 break;
6228 case L2CAP_TXSEQ_INVALID_IGNORE:
6229 break;
6230 case L2CAP_TXSEQ_INVALID:
6231 default:
5e4e3972 6232 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6233 break;
6234 }
6235 break;
6236 case L2CAP_EV_RECV_RR:
6237 l2cap_pass_to_tx(chan, control);
6238 if (control->final) {
6239 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6240
e6a3ee6e
MM		 6241 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6242 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6243 control->final = 0;
6244 l2cap_retransmit_all(chan, control);
6245 }
6246
6247 l2cap_ertm_send(chan);
6248 } else if (control->poll) {
6249 l2cap_send_i_or_rr_or_rnr(chan);
6250 } else {
6251 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6252 &chan->conn_state) &&
6253 chan->unacked_frames)
6254 __set_retrans_timer(chan);
6255
6256 l2cap_ertm_send(chan);
6257 }
6258 break;
6259 case L2CAP_EV_RECV_RNR:
6260 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6261 l2cap_pass_to_tx(chan, control);
6262 if (control && control->poll) {
6263 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6264 l2cap_send_rr_or_rnr(chan, 0);
6265 }
6266 __clear_retrans_timer(chan);
6267 l2cap_seq_list_clear(&chan->retrans_list);
6268 break;
6269 case L2CAP_EV_RECV_REJ:
6270 l2cap_handle_rej(chan, control);
6271 break;
6272 case L2CAP_EV_RECV_SREJ:
6273 l2cap_handle_srej(chan, control);
6274 break;
6275 default:
6276 break;
6277 }
6278
6279 if (skb && !skb_in_use) {
6280 BT_DBG("Freeing %p", skb);
6281 kfree_skb(skb);
6282 }
6283
6284 return err;
6285}
6286
6287static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6288 struct l2cap_ctrl *control,
6289 struct sk_buff *skb, u8 event)
6290{
6291 int err = 0;
6292 u16 txseq = control->txseq;
941247f9 6293 bool skb_in_use = false;
d2a7ac5d
MM		 6294
6295 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6296 event);
6297
6298 switch (event) {
6299 case L2CAP_EV_RECV_IFRAME:
6300 switch (l2cap_classify_txseq(chan, txseq)) {
6301 case L2CAP_TXSEQ_EXPECTED:
6302 /* Keep frame for reassembly later */
6303 l2cap_pass_to_tx(chan, control);
6304 skb_queue_tail(&chan->srej_q, skb);
941247f9 6305 skb_in_use = true;
d2a7ac5d
MM		 6306 BT_DBG("Queued %p (queue len %d)", skb,
6307 skb_queue_len(&chan->srej_q));
6308
6309 chan->expected_tx_seq = __next_seq(chan, txseq);
6310 break;
6311 case L2CAP_TXSEQ_EXPECTED_SREJ:
6312 l2cap_seq_list_pop(&chan->srej_list);
6313
6314 l2cap_pass_to_tx(chan, control);
6315 skb_queue_tail(&chan->srej_q, skb);
941247f9 6316 skb_in_use = true;
d2a7ac5d
MM		 6317 BT_DBG("Queued %p (queue len %d)", skb,
6318 skb_queue_len(&chan->srej_q));
6319
6320 err = l2cap_rx_queued_iframes(chan);
6321 if (err)
6322 break;
6323
6324 break;
6325 case L2CAP_TXSEQ_UNEXPECTED:
6326 /* Got a frame that can't be reassembled yet.
6327 * Save it for later, and send SREJs to cover
6328 * the missing frames.
6329 */
6330 skb_queue_tail(&chan->srej_q, skb);
941247f9 6331 skb_in_use = true;
d2a7ac5d
MM		 6332 BT_DBG("Queued %p (queue len %d)", skb,
6333 skb_queue_len(&chan->srej_q));
6334
6335 l2cap_pass_to_tx(chan, control);
6336 l2cap_send_srej(chan, control->txseq);
6337 break;
6338 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6339 /* This frame was requested with an SREJ, but
6340 * some expected retransmitted frames are
6341 * missing. Request retransmission of missing
6342 * SREJ'd frames.
6343 */
6344 skb_queue_tail(&chan->srej_q, skb);
941247f9 6345 skb_in_use = true;
d2a7ac5d
MM		 6346 BT_DBG("Queued %p (queue len %d)", skb,
6347 skb_queue_len(&chan->srej_q));
6348
6349 l2cap_pass_to_tx(chan, control);
6350 l2cap_send_srej_list(chan, control->txseq);
6351 break;
6352 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6353 /* We've already queued this frame. Drop this copy. */
6354 l2cap_pass_to_tx(chan, control);
6355 break;
6356 case L2CAP_TXSEQ_DUPLICATE:
6357 /* Expecting a later sequence number, so this frame
6358 * was already received. Ignore it completely.
6359 */
6360 break;
6361 case L2CAP_TXSEQ_INVALID_IGNORE:
6362 break;
6363 case L2CAP_TXSEQ_INVALID:
6364 default:
5e4e3972 6365 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6366 break;
6367 }
6368 break;
6369 case L2CAP_EV_RECV_RR:
6370 l2cap_pass_to_tx(chan, control);
6371 if (control->final) {
6372 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6373
6374 if (!test_and_clear_bit(CONN_REJ_ACT,
6375 &chan->conn_state)) {
6376 control->final = 0;
6377 l2cap_retransmit_all(chan, control);
6378 }
6379
6380 l2cap_ertm_send(chan);
6381 } else if (control->poll) {
6382 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6383 &chan->conn_state) &&
6384 chan->unacked_frames) {
6385 __set_retrans_timer(chan);
6386 }
6387
6388 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6389 l2cap_send_srej_tail(chan);
6390 } else {
6391 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6392 &chan->conn_state) &&
6393 chan->unacked_frames)
6394 __set_retrans_timer(chan);
6395
6396 l2cap_send_ack(chan);
6397 }
6398 break;
6399 case L2CAP_EV_RECV_RNR:
6400 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6401 l2cap_pass_to_tx(chan, control);
6402 if (control->poll) {
6403 l2cap_send_srej_tail(chan);
6404 } else {
6405 struct l2cap_ctrl rr_control;
6406 memset(&rr_control, 0, sizeof(rr_control));
6407 rr_control.sframe = 1;
6408 rr_control.super = L2CAP_SUPER_RR;
6409 rr_control.reqseq = chan->buffer_seq;
6410 l2cap_send_sframe(chan, &rr_control);
6411 }
6412
6413 break;
6414 case L2CAP_EV_RECV_REJ:
6415 l2cap_handle_rej(chan, control);
6416 break;
6417 case L2CAP_EV_RECV_SREJ:
6418 l2cap_handle_srej(chan, control);
6419 break;
6420 }
6421
6422 if (skb && !skb_in_use) {
6423 BT_DBG("Freeing %p", skb);
6424 kfree_skb(skb);
6425 }
6426
6427 return err;
6428}
6429
32b32735
MM		 6430static int l2cap_finish_move(struct l2cap_chan *chan)
6431{
6432 BT_DBG("chan %p", chan);
6433
6434 chan->rx_state = L2CAP_RX_STATE_RECV;
6435
6436 if (chan->hs_hcon)
6437 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6438 else
6439 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6440
6441 return l2cap_resegment(chan);
6442}
6443
6444static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6445 struct l2cap_ctrl *control,
6446 struct sk_buff *skb, u8 event)
6447{
6448 int err;
6449
6450 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6451 event);
6452
6453 if (!control->poll)
6454 return -EPROTO;
6455
6456 l2cap_process_reqseq(chan, control->reqseq);
6457
6458 if (!skb_queue_empty(&chan->tx_q))
6459 chan->tx_send_head = skb_peek(&chan->tx_q);
6460 else
6461 chan->tx_send_head = NULL;
6462
6463 /* Rewind next_tx_seq to the point expected
6464 * by the receiver.
6465 */
6466 chan->next_tx_seq = control->reqseq;
6467 chan->unacked_frames = 0;
6468
6469 err = l2cap_finish_move(chan);
6470 if (err)
6471 return err;
6472
6473 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6474 l2cap_send_i_or_rr_or_rnr(chan);
6475
6476 if (event == L2CAP_EV_RECV_IFRAME)
6477 return -EPROTO;
6478
6479 return l2cap_rx_state_recv(chan, control, NULL, event);
6480}
6481
6482static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6483 struct l2cap_ctrl *control,
6484 struct sk_buff *skb, u8 event)
6485{
6486 int err;
6487
6488 if (!control->final)
6489 return -EPROTO;
6490
6491 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6492
6493 chan->rx_state = L2CAP_RX_STATE_RECV;
6494 l2cap_process_reqseq(chan, control->reqseq);
6495
6496 if (!skb_queue_empty(&chan->tx_q))
6497 chan->tx_send_head = skb_peek(&chan->tx_q);
6498 else
6499 chan->tx_send_head = NULL;
6500
6501 /* Rewind next_tx_seq to the point expected
6502 * by the receiver.
6503 */
6504 chan->next_tx_seq = control->reqseq;
6505 chan->unacked_frames = 0;
6506
6507 if (chan->hs_hcon)
6508 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6509 else
6510 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6511
6512 err = l2cap_resegment(chan);
6513
6514 if (!err)
6515 err = l2cap_rx_state_recv(chan, control, skb, event);
6516
6517 return err;
6518}
6519
d2a7ac5d
MM		 6520static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6521{
6522 /* Make sure reqseq is for a packet that has been sent but not acked */
6523 u16 unacked;
6524
6525 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6526 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6527}
6528
cec8ab6e
MM		 6529static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6530 struct sk_buff *skb, u8 event)
218bb9df 6531{
d2a7ac5d
MM		 6532 int err = 0;
6533
6534 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6535 control, skb, event, chan->rx_state);
6536
6537 if (__valid_reqseq(chan, control->reqseq)) {
6538 switch (chan->rx_state) {
6539 case L2CAP_RX_STATE_RECV:
6540 err = l2cap_rx_state_recv(chan, control, skb, event);
6541 break;
6542 case L2CAP_RX_STATE_SREJ_SENT:
6543 err = l2cap_rx_state_srej_sent(chan, control, skb,
6544 event);
6545 break;
32b32735
MM		 6546 case L2CAP_RX_STATE_WAIT_P:
6547 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6548 break;
6549 case L2CAP_RX_STATE_WAIT_F:
6550 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6551 break;
d2a7ac5d
MM		 6552 default:
6553 /* shut it down */
6554 break;
6555 }
6556 } else {
6557 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6558 control->reqseq, chan->next_tx_seq,
6559 chan->expected_ack_seq);
5e4e3972 6560 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6561 }
6562
6563 return err;
cec8ab6e
MM		 6564}
6565
6566static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6567 struct sk_buff *skb)
6568{
4b51dae9
MM		 6569 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6570 chan->rx_state);
6571
6572 if (l2cap_classify_txseq(chan, control->txseq) ==
6573 L2CAP_TXSEQ_EXPECTED) {
6574 l2cap_pass_to_tx(chan, control);
6575
6576 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6577 __next_seq(chan, chan->buffer_seq));
6578
6579 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6580
6581 l2cap_reassemble_sdu(chan, skb, control);
6582 } else {
6583 if (chan->sdu) {
6584 kfree_skb(chan->sdu);
6585 chan->sdu = NULL;
6586 }
6587 chan->sdu_last_frag = NULL;
6588 chan->sdu_len = 0;
6589
6590 if (skb) {
6591 BT_DBG("Freeing %p", skb);
6592 kfree_skb(skb);
6593 }
6594 }
6595
6596 chan->last_acked_seq = control->txseq;
6597 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6598
9a544210 6599 return 0;
cec8ab6e
MM		 6600}
6601
6602static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6603{
a4368ff3 6604 struct l2cap_ctrl *control = &bt_cb(skb)->l2cap;
cec8ab6e
MM		 6605 u16 len;
6606 u8 event;
218bb9df 6607
b76bbd66
MM		 6608 __unpack_control(chan, skb);
6609
218bb9df
GP		 6610 len = skb->len;
6611
6612 /*
6613 * We can just drop the corrupted I-frame here.
6614 * Receiver will miss it and start proper recovery
cec8ab6e 6615 * procedures and ask for retransmission.
218bb9df 6616 */
47d1ec61 6617 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6618 goto drop;
6619
cec8ab6e 6620 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6621 len -= L2CAP_SDULEN_SIZE;
218bb9df 6622
47d1ec61 6623 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6624 len -= L2CAP_FCS_SIZE;
218bb9df 6625
47d1ec61 6626 if (len > chan->mps) {
5e4e3972 6627 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6628 goto drop;
6629 }
6630
dbb50887
DB		 6631 if ((chan->mode == L2CAP_MODE_ERTM ||
6632 chan->mode == L2CAP_MODE_STREAMING) && sk_filter(chan->data, skb))
6633 goto drop;
6634
cec8ab6e
MM		 6635 if (!control->sframe) {
6636 int err;
218bb9df 6637
cec8ab6e
MM		 6638 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6639 control->sar, control->reqseq, control->final,
6640 control->txseq);
218bb9df 6641
cec8ab6e
MM		 6642 /* Validate F-bit - F=0 always valid, F=1 only
6643 * valid in TX WAIT_F
6644 */
6645 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6646 goto drop;
cec8ab6e
MM		 6647
6648 if (chan->mode != L2CAP_MODE_STREAMING) {
6649 event = L2CAP_EV_RECV_IFRAME;
6650 err = l2cap_rx(chan, control, skb, event);
6651 } else {
6652 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6653 }
6654
cec8ab6e 6655 if (err)
5e4e3972 6656 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6657 } else {
cec8ab6e
MM		 6658 const u8 rx_func_to_event[4] = {
6659 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6660 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6661 };
6662
6663 /* Only I-frames are expected in streaming mode */
6664 if (chan->mode == L2CAP_MODE_STREAMING)
6665 goto drop;
6666
6667 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6668 control->reqseq, control->final, control->poll,
6669 control->super);
6670
218bb9df 6671 if (len != 0) {
1bb166e6 6672 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6673 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6674 goto drop;
6675 }
6676
cec8ab6e
MM		 6677 /* Validate F and P bits */
6678 if (control->final && (control->poll ||
6679 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6680 goto drop;
6681
6682 event = rx_func_to_event[control->super];
6683 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6684 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6685 }
6686
6687 return 0;
6688
6689drop:
6690 kfree_skb(skb);
6691 return 0;
6692}
6693
b1c325c2
JH		 6694static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6695{
6696 struct l2cap_conn *conn = chan->conn;
6697 struct l2cap_le_credits pkt;
6698 u16 return_credits;
6699
6700 /* We return more credits to the sender only after the amount of
6701 * credits falls below half of the initial amount.
6702 */
f15b8ecf 6703 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6704 return;
6705
f15b8ecf 6706 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6707
6708 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6709
6710 chan->rx_credits += return_credits;
6711
6712 pkt.cid = cpu_to_le16(chan->scid);
6713 pkt.credits = cpu_to_le16(return_credits);
6714
6715 chan->ident = l2cap_get_ident(conn);
6716
6717 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6718}
6719
fad5fc89
JH		 6720static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6721{
aac23bf6
JH		 6722 int err;
6723
6724 if (!chan->rx_credits) {
6725 BT_ERR("No credits to receive LE L2CAP data");
dfd9774c 6726 l2cap_send_disconn_req(chan, ECONNRESET);
fad5fc89 6727 return -ENOBUFS;
aac23bf6 6728 }
fad5fc89 6729
aac23bf6
JH		 6730 if (chan->imtu < skb->len) {
6731 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6732 return -ENOBUFS;
aac23bf6 6733 }
fad5fc89
JH		 6734
6735 chan->rx_credits--;
6736 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6737
6738 l2cap_chan_le_send_credits(chan);
6739
aac23bf6
JH		 6740 err = 0;
6741
6742 if (!chan->sdu) {
6743 u16 sdu_len;
6744
6745 sdu_len = get_unaligned_le16(skb->data);
6746 skb_pull(skb, L2CAP_SDULEN_SIZE);
6747
6748 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6749 sdu_len, skb->len, chan->imtu);
6750
6751 if (sdu_len > chan->imtu) {
6752 BT_ERR("Too big LE L2CAP SDU length received");
6753 err = -EMSGSIZE;
6754 goto failed;
6755 }
6756
6757 if (skb->len > sdu_len) {
6758 BT_ERR("Too much LE L2CAP data received");
6759 err = -EINVAL;
6760 goto failed;
6761 }
6762
6763 if (skb->len == sdu_len)
6764 return chan->ops->recv(chan, skb);
6765
6766 chan->sdu = skb;
6767 chan->sdu_len = sdu_len;
6768 chan->sdu_last_frag = skb;
6769
6770 return 0;
6771 }
6772
6773 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6774 chan->sdu->len, skb->len, chan->sdu_len);
6775
6776 if (chan->sdu->len + skb->len > chan->sdu_len) {
6777 BT_ERR("Too much LE L2CAP data received");
6778 err = -EINVAL;
6779 goto failed;
6780 }
6781
6782 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6783 skb = NULL;
6784
6785 if (chan->sdu->len == chan->sdu_len) {
6786 err = chan->ops->recv(chan, chan->sdu);
6787 if (!err) {
6788 chan->sdu = NULL;
6789 chan->sdu_last_frag = NULL;
6790 chan->sdu_len = 0;
6791 }
6792 }
6793
6794failed:
6795 if (err) {
6796 kfree_skb(skb);
6797 kfree_skb(chan->sdu);
6798 chan->sdu = NULL;
6799 chan->sdu_last_frag = NULL;
6800 chan->sdu_len = 0;
6801 }
6802
6803 /* We can't return an error here since we took care of the skb
6804 * freeing internally. An error return would cause the caller to
6805 * do a double-free of the skb.
6806 */
6807 return 0;
fad5fc89
JH		 6808}
6809
13ca56e0
AE		 6810static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6811 struct sk_buff *skb)
1da177e4 6812{
48454079 6813 struct l2cap_chan *chan;
1da177e4 6814
baa7e1fa 6815 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6816 if (!chan) {
97e8e89d
AE		 6817 if (cid == L2CAP_CID_A2MP) {
6818 chan = a2mp_channel_create(conn, skb);
6819 if (!chan) {
6820 kfree_skb(skb);
13ca56e0 6821 return;
97e8e89d
AE		 6822 }
6823
6824 l2cap_chan_lock(chan);
6825 } else {
6826 BT_DBG("unknown cid 0x%4.4x", cid);
6827 /* Drop packet and return */
6828 kfree_skb(skb);
13ca56e0 6829 return;
97e8e89d 6830 }
1da177e4
LT		 6831 }
6832
49208c9c 6833 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6834
315917e0
JH		 6835 /* If we receive data on a fixed channel before the info req/rsp
6836 * procdure is done simply assume that the channel is supported
6837 * and mark it as ready.
6838 */
6839 if (chan->chan_type == L2CAP_CHAN_FIXED)
6840 l2cap_chan_ready(chan);
6841
89bc500e 6842 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6843 goto drop;
6844
0c1bc5c6 6845 switch (chan->mode) {
38319713 6846 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6847 if (l2cap_le_data_rcv(chan, skb) < 0)
6848 goto drop;
6849
6850 goto done;
6851
1c2acffb
GP		 6852 case L2CAP_MODE_BASIC:
6853 /* If socket recv buffers overflows we drop data here
6854 * which is *bad* because L2CAP has to be reliable.
6855 * But we don't have any other choice. L2CAP doesn't
6856 * provide flow control mechanism. */
1da177e4 6857
2c96e03d
SJ		 6858 if (chan->imtu < skb->len) {
6859 BT_ERR("Dropping L2CAP data: receive buffer overflow");
1c2acffb 6860 goto drop;
2c96e03d 6861 }
1da177e4 6862
80b98027 6863 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6864 goto done;
6865 break;
6866
6867 case L2CAP_MODE_ERTM:
6840ed07 6868 case L2CAP_MODE_STREAMING:
cec8ab6e 6869 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6870 goto done;
6871
1c2acffb 6872 default:
0c1bc5c6 6873 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6874 break;
6875 }
1da177e4
LT		 6876
6877drop:
6878 kfree_skb(skb);
6879
6880done:
6be36555 6881 l2cap_chan_unlock(chan);
1da177e4
LT		 6882}
6883
84104b24
AE		 6884static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6885 struct sk_buff *skb)
1da177e4 6886{
ae4fd2d3 6887 struct hci_conn *hcon = conn->hcon;
23691d75 6888 struct l2cap_chan *chan;
1da177e4 6889
ae4fd2d3 6890 if (hcon->type != ACL_LINK)
a24cce14 6891 goto free_skb;
ae4fd2d3 6892
bf20fd4e
JH		 6893 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6894 ACL_LINK);
23691d75 6895 if (!chan)
a24cce14 6896 goto free_skb;
1da177e4 6897
5b4cedaa 6898 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6899
89bc500e 6900 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6901 goto drop;
6902
e13e21dc 6903 if (chan->imtu < skb->len)
1da177e4
LT		 6904 goto drop;
6905
2edf870d 6906 /* Store remote BD_ADDR and PSM for msg_name */
a4368ff3
JH		 6907 bacpy(&bt_cb(skb)->l2cap.bdaddr, &hcon->dst);
6908 bt_cb(skb)->l2cap.psm = psm;
2edf870d 6909
a24cce14
JH		 6910 if (!chan->ops->recv(chan, skb)) {
6911 l2cap_chan_put(chan);
84104b24 6912 return;
a24cce14 6913 }
1da177e4
LT		 6914
6915drop:
a24cce14
JH		 6916 l2cap_chan_put(chan);
6917free_skb:
1da177e4 6918 kfree_skb(skb);
1da177e4
LT		 6919}
6920
6921static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6922{
6923 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6924 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6925 u16 cid, len;
6926 __le16 psm;
1da177e4 6927
61a939c6
JH		 6928 if (hcon->state != BT_CONNECTED) {
6929 BT_DBG("queueing pending rx skb");
6930 skb_queue_tail(&conn->pending_rx, skb);
6931 return;
6932 }
6933
1da177e4
LT		 6934 skb_pull(skb, L2CAP_HDR_SIZE);
6935 cid = __le16_to_cpu(lh->cid);
6936 len = __le16_to_cpu(lh->len);
6937
1c2acffb
GP		 6938 if (len != skb->len) {
6939 kfree_skb(skb);
6940 return;
6941 }
6942
9e1d7e15
JH		 6943 /* Since we can't actively block incoming LE connections we must
6944 * at least ensure that we ignore incoming data from them.
6945 */
6946 if (hcon->type == LE_LINK &&
dcc36c16 6947 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
a250e048 6948 bdaddr_dst_type(hcon))) {
e493150e
JH		 6949 kfree_skb(skb);
6950 return;
6951 }
6952
1da177e4
LT		 6953 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6954
6955 switch (cid) {
8db4dc46 6956 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6957 l2cap_sig_channel(conn, skb);
6958 break;
6959
8db4dc46 6960 case L2CAP_CID_CONN_LESS:
097db76c 6961 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6962 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6963 l2cap_conless_channel(conn, psm, skb);
6964 break;
6965
a2877629
MH		 6966 case L2CAP_CID_LE_SIGNALING:
6967 l2cap_le_sig_channel(conn, skb);
6968 break;
6969
1da177e4
LT		 6970 default:
6971 l2cap_data_channel(conn, cid, skb);
6972 break;
6973 }
6974}
6975
61a939c6
JH		 6976static void process_pending_rx(struct work_struct *work)
6977{
6978 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6979 pending_rx_work);
6980 struct sk_buff *skb;
6981
6982 BT_DBG("");
6983
6984 while ((skb = skb_dequeue(&conn->pending_rx)))
6985 l2cap_recv_frame(conn, skb);
6986}
6987
162b49e7
JH		 6988static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6989{
6990 struct l2cap_conn *conn = hcon->l2cap_data;
6991 struct hci_chan *hchan;
6992
6993 if (conn)
6994 return conn;
6995
6996 hchan = hci_chan_create(hcon);
6997 if (!hchan)
6998 return NULL;
6999
27f70f3e 7000 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
162b49e7
JH		 7001 if (!conn) {
7002 hci_chan_del(hchan);
7003 return NULL;
7004 }
7005
7006 kref_init(&conn->ref);
7007 hcon->l2cap_data = conn;
51bb8457 7008 conn->hcon = hci_conn_get(hcon);
162b49e7
JH		 7009 conn->hchan = hchan;
7010
7011 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
7012
7013 switch (hcon->type) {
7014 case LE_LINK:
7015 if (hcon->hdev->le_mtu) {
7016 conn->mtu = hcon->hdev->le_mtu;
7017 break;
7018 }
7019 /* fall through */
7020 default:
7021 conn->mtu = hcon->hdev->acl_mtu;
7022 break;
7023 }
7024
7025 conn->feat_mask = 0;
7026
0bd49fc7
JH		 7027 conn->local_fixed_chan = L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS;
7028
7029 if (hcon->type == ACL_LINK &&
d7a5a11d 7030 hci_dev_test_flag(hcon->hdev, HCI_HS_ENABLED))
0bd49fc7 7031 conn->local_fixed_chan |= L2CAP_FC_A2MP;
162b49e7 7032
d7a5a11d 7033 if (hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED) &&
f9be9e86 7034 (bredr_sc_enabled(hcon->hdev) ||
b7cb93e5 7035 hci_dev_test_flag(hcon->hdev, HCI_FORCE_BREDR_SMP)))
b5ae344d
JH		 7036 conn->local_fixed_chan |= L2CAP_FC_SMP_BREDR;
7037
5a54e7c8 7038 mutex_init(&conn->ident_lock);
162b49e7
JH		 7039 mutex_init(&conn->chan_lock);
7040
7041 INIT_LIST_HEAD(&conn->chan_l);
7042 INIT_LIST_HEAD(&conn->users);
7043
276d8073 7044 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
162b49e7 7045
61a939c6
JH		 7046 skb_queue_head_init(&conn->pending_rx);
7047 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
f3d82d0c 7048 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
61a939c6 7049
162b49e7
JH		 7050 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
7051
7052 return conn;
7053}
7054
7055static bool is_valid_psm(u16 psm, u8 dst_type) {
7056 if (!psm)
7057 return false;
7058
7059 if (bdaddr_type_is_le(dst_type))
7060 return (psm <= 0x00ff);
7061
7062 /* PSM must be odd and lsb of upper byte must be 0 */
7063 return ((psm & 0x0101) == 0x0001);
7064}
7065
7066int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
7067 bdaddr_t *dst, u8 dst_type)
7068{
7069 struct l2cap_conn *conn;
7070 struct hci_conn *hcon;
7071 struct hci_dev *hdev;
162b49e7
JH		 7072 int err;
7073
7074 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7075 dst_type, __le16_to_cpu(psm));
7076
39385cb5 7077 hdev = hci_get_route(dst, &chan->src, chan->src_type);
162b49e7
JH		 7078 if (!hdev)
7079 return -EHOSTUNREACH;
7080
7081 hci_dev_lock(hdev);
7082
162b49e7
JH		 7083 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7084 chan->chan_type != L2CAP_CHAN_RAW) {
7085 err = -EINVAL;
7086 goto done;
7087 }
7088
21626e62
JH		 7089 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7090 err = -EINVAL;
7091 goto done;
7092 }
7093
7094 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 7095 err = -EINVAL;
7096 goto done;
7097 }
7098
7099 switch (chan->mode) {
7100 case L2CAP_MODE_BASIC:
7101 break;
7102 case L2CAP_MODE_LE_FLOWCTL:
7103 l2cap_le_flowctl_init(chan);
7104 break;
7105 case L2CAP_MODE_ERTM:
7106 case L2CAP_MODE_STREAMING:
7107 if (!disable_ertm)
7108 break;
7109 /* fall through */
7110 default:
beb19e4c 7111 err = -EOPNOTSUPP;
162b49e7
JH		 7112 goto done;
7113 }
7114
7115 switch (chan->state) {
7116 case BT_CONNECT:
7117 case BT_CONNECT2:
7118 case BT_CONFIG:
7119 /* Already connecting */
7120 err = 0;
7121 goto done;
7122
7123 case BT_CONNECTED:
7124 /* Already connected */
7125 err = -EISCONN;
7126 goto done;
7127
7128 case BT_OPEN:
7129 case BT_BOUND:
7130 /* Can connect */
7131 break;
7132
7133 default:
7134 err = -EBADFD;
7135 goto done;
7136 }
7137
7138 /* Set destination address and psm */
7139 bacpy(&chan->dst, dst);
7140 chan->dst_type = dst_type;
7141
7142 chan->psm = psm;
7143 chan->dcid = cid;
7144
6f77d8c7
AG		 7145 if (bdaddr_type_is_le(dst_type)) {
7146 /* Convert from L2CAP channel address type to HCI address type
7147 */
7148 if (dst_type == BDADDR_LE_PUBLIC)
7149 dst_type = ADDR_LE_DEV_PUBLIC;
7150 else
7151 dst_type = ADDR_LE_DEV_RANDOM;
7152
d7a5a11d 7153 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
0ad06aa6
JH		 7154 hcon = hci_connect_le(hdev, dst, dst_type,
7155 chan->sec_level,
7156 HCI_LE_CONN_TIMEOUT,
7157 HCI_ROLE_SLAVE);
e804d25d 7158 else
0ad06aa6
JH		 7159 hcon = hci_connect_le_scan(hdev, dst, dst_type,
7160 chan->sec_level,
7161 HCI_LE_CONN_TIMEOUT);
cdd6275e 7162
6f77d8c7 7163 } else {
d93375a8 7164 u8 auth_type = l2cap_get_auth_type(chan);
04a6c589 7165 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
6f77d8c7 7166 }
162b49e7
JH		 7167
7168 if (IS_ERR(hcon)) {
7169 err = PTR_ERR(hcon);
7170 goto done;
7171 }
7172
7173 conn = l2cap_conn_add(hcon);
7174 if (!conn) {
7175 hci_conn_drop(hcon);
7176 err = -ENOMEM;
7177 goto done;
7178 }
7179
02e246ae
JH		 7180 mutex_lock(&conn->chan_lock);
7181 l2cap_chan_lock(chan);
7182
162b49e7
JH		 7183 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7184 hci_conn_drop(hcon);
7185 err = -EBUSY;
02e246ae 7186 goto chan_unlock;
162b49e7
JH		 7187 }
7188
7189 /* Update source addr of the socket */
7190 bacpy(&chan->src, &hcon->src);
a250e048 7191 chan->src_type = bdaddr_src_type(hcon);
162b49e7 7192
02e246ae 7193 __l2cap_chan_add(conn, chan);
162b49e7
JH		 7194
7195 /* l2cap_chan_add takes its own ref so we can drop this one */
7196 hci_conn_drop(hcon);
7197
7198 l2cap_state_change(chan, BT_CONNECT);
7199 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7200
61202e4d
JH		 7201 /* Release chan->sport so that it can be reused by other
7202 * sockets (as it's only used for listening sockets).
7203 */
7204 write_lock(&chan_list_lock);
7205 chan->sport = 0;
7206 write_unlock(&chan_list_lock);
7207
162b49e7
JH		 7208 if (hcon->state == BT_CONNECTED) {
7209 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7210 __clear_chan_timer(chan);
e7cafc45 7211 if (l2cap_chan_check_security(chan, true))
162b49e7
JH		 7212 l2cap_state_change(chan, BT_CONNECTED);
7213 } else
7214 l2cap_do_start(chan);
7215 }
7216
7217 err = 0;
7218
02e246ae 7219chan_unlock:
162b49e7 7220 l2cap_chan_unlock(chan);
02e246ae
JH		 7221 mutex_unlock(&conn->chan_lock);
7222done:
162b49e7
JH		 7223 hci_dev_unlock(hdev);
7224 hci_dev_put(hdev);
7225 return err;
7226}
6b8d4a6a 7227EXPORT_SYMBOL_GPL(l2cap_chan_connect);
162b49e7 7228
1da177e4
LT		 7229/* ---- L2CAP interface with lower layer (HCI) ---- */
7230
686ebf28 7231int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7232{
7233 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7234 struct l2cap_chan *c;
1da177e4 7235
6ed93dc6 7236 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7237
7238 /* Find listening sockets and check their link_mode */
23691d75
GP		 7239 read_lock(&chan_list_lock);
7240 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7241 if (c->state != BT_LISTEN)
1da177e4
LT		 7242 continue;
7243
7eafc59e 7244 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7245 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7246 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7247 lm1 |= HCI_LM_MASTER;
1da177e4 7248 exact++;
7eafc59e 7249 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7250 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7251 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7252 lm2 |= HCI_LM_MASTER;
7253 }
1da177e4 7254 }
23691d75 7255 read_unlock(&chan_list_lock);
1da177e4
LT		 7256
7257 return exact ? lm1 : lm2;
7258}
7259
e760ec12
JH		 7260/* Find the next fixed channel in BT_LISTEN state, continue iteration
7261 * from an existing channel in the list or from the beginning of the
7262 * global list (by passing NULL as first parameter).
7263 */
7264static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
327a7191 7265 struct hci_conn *hcon)
e760ec12 7266{
327a7191
JH		 7267 u8 src_type = bdaddr_src_type(hcon);
7268
e760ec12
JH		 7269 read_lock(&chan_list_lock);
7270
7271 if (c)
7272 c = list_next_entry(c, global_l);
7273 else
7274 c = list_entry(chan_list.next, typeof(*c), global_l);
7275
7276 list_for_each_entry_from(c, &chan_list, global_l) {
7277 if (c->chan_type != L2CAP_CHAN_FIXED)
7278 continue;
7279 if (c->state != BT_LISTEN)
7280 continue;
327a7191 7281 if (bacmp(&c->src, &hcon->src) && bacmp(&c->src, BDADDR_ANY))
54a1b626 7282 continue;
327a7191 7283 if (src_type != c->src_type)
54a1b626 7284 continue;
e760ec12
JH		 7285
7286 l2cap_chan_hold(c);
7287 read_unlock(&chan_list_lock);
7288 return c;
7289 }
7290
7291 read_unlock(&chan_list_lock);
7292
7293 return NULL;
7294}
7295
539c496d 7296static void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7297{
e760ec12 7298 struct hci_dev *hdev = hcon->hdev;
0139418c 7299 struct l2cap_conn *conn;
e760ec12
JH		 7300 struct l2cap_chan *pchan;
7301 u8 dst_type;
0139418c 7302
539c496d
JH		 7303 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7304 return;
7305
6ed93dc6 7306 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7307
dc0f5088 7308 if (status) {
e175072f 7309 l2cap_conn_del(hcon, bt_to_errno(status));
dc0f5088 7310 return;
ba6fc317 7311 }
dc0f5088
JH		 7312
7313 conn = l2cap_conn_add(hcon);
7314 if (!conn)
7315 return;
7316
a250e048 7317 dst_type = bdaddr_dst_type(hcon);
e760ec12
JH		 7318
7319 /* If device is blocked, do not create channels for it */
7320 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7321 return;
7322
7323 /* Find fixed channels and notify them of the new connection. We
7324 * use multiple individual lookups, continuing each time where
7325 * we left off, because the list lock would prevent calling the
7326 * potentially sleeping l2cap_chan_lock() function.
7327 */
327a7191 7328 pchan = l2cap_global_fixed_chan(NULL, hcon);
e760ec12
JH		 7329 while (pchan) {
7330 struct l2cap_chan *chan, *next;
7331
7332 /* Client fixed channels should override server ones */
7333 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7334 goto next;
7335
7336 l2cap_chan_lock(pchan);
7337 chan = pchan->ops->new_connection(pchan);
7338 if (chan) {
7339 bacpy(&chan->src, &hcon->src);
7340 bacpy(&chan->dst, &hcon->dst);
a250e048 7341 chan->src_type = bdaddr_src_type(hcon);
e760ec12
JH		 7342 chan->dst_type = dst_type;
7343
7344 __l2cap_chan_add(conn, chan);
7345 }
7346
7347 l2cap_chan_unlock(pchan);
7348next:
327a7191 7349 next = l2cap_global_fixed_chan(pchan, hcon);
e760ec12
JH		 7350 l2cap_chan_put(pchan);
7351 pchan = next;
7352 }
7353
dc0f5088 7354 l2cap_conn_ready(conn);
1da177e4
LT		 7355}
7356
686ebf28 7357int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7358{
7359 struct l2cap_conn *conn = hcon->l2cap_data;
7360
7361 BT_DBG("hcon %p", hcon);
7362
686ebf28 7363 if (!conn)
9f5a0d7b 7364 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7365 return conn->disc_reason;
7366}
7367
3a6d576b 7368static void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4 7369{
3a6d576b
JH		 7370 if (hcon->type != ACL_LINK && hcon->type != LE_LINK)
7371 return;
7372
1da177e4
LT		 7373 BT_DBG("hcon %p reason %d", hcon, reason);
7374
e175072f 7375 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7376}
7377
4343478f 7378static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7379{
715ec005 7380 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7381 return;
7382
f62e4323 7383 if (encrypt == 0x00) {
4343478f 7384 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7385 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7386 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7387 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7388 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7389 } else {
4343478f 7390 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7391 __clear_chan_timer(chan);
f62e4323
MH		 7392 }
7393}
7394
354fe804 7395static void l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7396{
0139418c 7397 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7398 struct l2cap_chan *chan;
1da177e4 7399
0139418c 7400 if (!conn)
354fe804 7401 return;
0139418c 7402
89d8b407 7403 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7404
3df91ea2 7405 mutex_lock(&conn->chan_lock);
1da177e4 7406
3df91ea2 7407 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7408 l2cap_chan_lock(chan);
1da177e4 7409
89d8b407
AE		 7410 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7411 state_to_string(chan->state));
f1cb9af5 7412
2338a7e0 7413 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7414 l2cap_chan_unlock(chan);
7415 continue;
7416 }
7417
191eb398
JH		 7418 if (!status && encrypt)
7419 chan->sec_level = hcon->sec_level;
f1cb9af5 7420
96eff46e 7421 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7422 l2cap_chan_unlock(chan);
6a8d3010
MH		 7423 continue;
7424 }
7425
89bc500e 7426 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7427 chan->state == BT_CONFIG)) {
d97c899b 7428 chan->ops->resume(chan);
4343478f 7429 l2cap_check_encryption(chan, encrypt);
6be36555 7430 l2cap_chan_unlock(chan);
9719f8af
MH		 7431 continue;
7432 }
7433
89bc500e 7434 if (chan->state == BT_CONNECT) {
6d3c15da 7435 if (!status)
93c3e8f5 7436 l2cap_start_connection(chan);
6d3c15da 7437 else
ba13ccd9 7438 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
fa37c1aa
JH		 7439 } else if (chan->state == BT_CONNECT2 &&
7440 chan->mode != L2CAP_MODE_LE_FLOWCTL) {
b1235d79 7441 struct l2cap_conn_rsp rsp;
df3c3931 7442 __u16 res, stat;
1da177e4 7443
b1235d79 7444 if (!status) {
bdc25783 7445 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7446 res = L2CAP_CR_PEND;
7447 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7448 chan->ops->defer(chan);
df3c3931 7449 } else {
acdcabf5 7450 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7451 res = L2CAP_CR_SUCCESS;
7452 stat = L2CAP_CS_NO_INFO;
7453 }
b1235d79 7454 } else {
acdcabf5 7455 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7456 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7457 res = L2CAP_CR_SEC_BLOCK;
7458 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7459 }
7460
fe4128e0
GP		 7461 rsp.scid = cpu_to_le16(chan->dcid);
7462 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7463 rsp.result = cpu_to_le16(res);
7464 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7465 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7466 sizeof(rsp), &rsp);
2d369359
MM		 7467
7468 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7469 res == L2CAP_CR_SUCCESS) {
7470 char buf[128];
7471 set_bit(CONF_REQ_SENT, &chan->conf_state);
7472 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7473 L2CAP_CONF_REQ,
8cb091c6 7474 l2cap_build_conf_req(chan, buf, sizeof(buf)),
2d369359
MM		 7475 buf);
7476 chan->num_conf_req++;
7477 }
b1235d79 7478 }
1da177e4 7479
6be36555 7480 l2cap_chan_unlock(chan);
1da177e4
LT		 7481 }
7482
3df91ea2 7483 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 7484}
7485
9b4c3336 7486void l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7487{
7488 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7489 struct l2cap_hdr *hdr;
7490 int len;
1da177e4 7491
1d13a254 7492 /* For AMP controller do not create l2cap conn */
ca8bee5d 7493 if (!conn && hcon->hdev->dev_type != HCI_PRIMARY)
1d13a254 7494 goto drop;
1da177e4 7495
5a08ecce 7496 if (!conn)
baf43251 7497 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7498
7499 if (!conn)
1da177e4
LT		 7500 goto drop;
7501
7502 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7503
d73a0988
AE		 7504 switch (flags) {
7505 case ACL_START:
7506 case ACL_START_NO_FLUSH:
7507 case ACL_COMPLETE:
1da177e4
LT		 7508 if (conn->rx_len) {
7509 BT_ERR("Unexpected start frame (len %d)", skb->len);
7510 kfree_skb(conn->rx_skb);
7511 conn->rx_skb = NULL;
7512 conn->rx_len = 0;
7513 l2cap_conn_unreliable(conn, ECOMM);
7514 }
7515
aae7fe22
AE		 7516 /* Start fragment always begin with Basic L2CAP header */
7517 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7518 BT_ERR("Frame is too short (len %d)", skb->len);
7519 l2cap_conn_unreliable(conn, ECOMM);
7520 goto drop;
7521 }
7522
7523 hdr = (struct l2cap_hdr *) skb->data;
7524 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7525
7526 if (len == skb->len) {
7527 /* Complete frame received */
7528 l2cap_recv_frame(conn, skb);
9b4c3336 7529 return;
1da177e4
LT		 7530 }
7531
7532 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7533
7534 if (skb->len > len) {
7535 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7536 skb->len, len);
1da177e4
LT		 7537 l2cap_conn_unreliable(conn, ECOMM);
7538 goto drop;
7539 }
7540
7541 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7542 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7543 if (!conn->rx_skb)
1da177e4
LT		 7544 goto drop;
7545
d626f62b 7546 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7547 skb->len);
1da177e4 7548 conn->rx_len = len - skb->len;
d73a0988
AE		 7549 break;
7550
7551 case ACL_CONT:
1da177e4
LT		 7552 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7553
7554 if (!conn->rx_len) {
7555 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7556 l2cap_conn_unreliable(conn, ECOMM);
7557 goto drop;
7558 }
7559
7560 if (skb->len > conn->rx_len) {
7561 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7562 skb->len, conn->rx_len);
1da177e4
LT		 7563 kfree_skb(conn->rx_skb);
7564 conn->rx_skb = NULL;
7565 conn->rx_len = 0;
7566 l2cap_conn_unreliable(conn, ECOMM);
7567 goto drop;
7568 }
7569
d626f62b 7570 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7571 skb->len);
1da177e4
LT		 7572 conn->rx_len -= skb->len;
7573
7574 if (!conn->rx_len) {
c4e5bafa
JH		 7575 /* Complete frame received. l2cap_recv_frame
7576 * takes ownership of the skb so set the global
7577 * rx_skb pointer to NULL first.
7578 */
7579 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7580 conn->rx_skb = NULL;
c4e5bafa 7581 l2cap_recv_frame(conn, rx_skb);
1da177e4 7582 }
d73a0988 7583 break;
1da177e4
LT		 7584 }
7585
7586drop:
7587 kfree_skb(skb);
1da177e4
LT		 7588}
7589
354fe804
JH		 7590static struct hci_cb l2cap_cb = {
7591 .name = "L2CAP",
539c496d 7592 .connect_cfm = l2cap_connect_cfm,
3a6d576b 7593 .disconn_cfm = l2cap_disconn_cfm,
354fe804
JH		 7594 .security_cfm = l2cap_security_cfm,
7595};
7596
aef7d97c 7597static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7598{
23691d75 7599 struct l2cap_chan *c;
1da177e4 7600
333055f2 7601 read_lock(&chan_list_lock);
1da177e4 7602
23691d75 7603 list_for_each_entry(c, &chan_list, global_l) {
eeb5a067
MH		 7604 seq_printf(f, "%pMR (%u) %pMR (%u) %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7605 &c->src, c->src_type, &c->dst, c->dst_type,
fcb73338
AE		 7606 c->state, __le16_to_cpu(c->psm),
7607 c->scid, c->dcid, c->imtu, c->omtu,
7608 c->sec_level, c->mode);
61e1b4b7 7609 }
1da177e4 7610
333055f2 7611 read_unlock(&chan_list_lock);
1da177e4 7612
aef7d97c 7613 return 0;
1da177e4
LT		 7614}
7615
aef7d97c
MH		 7616static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7617{
7618 return single_open(file, l2cap_debugfs_show, inode->i_private);
7619}
7620
7621static const struct file_operations l2cap_debugfs_fops = {
7622 .open = l2cap_debugfs_open,
7623 .read = seq_read,
7624 .llseek = seq_lseek,
7625 .release = single_release,
7626};
7627
7628static struct dentry *l2cap_debugfs;
1da177e4 7629
64274518 7630int __init l2cap_init(void)
1da177e4
LT		 7631{
7632 int err;
be9d1227 7633
bb58f747 7634 err = l2cap_init_sockets();
1da177e4
LT		 7635 if (err < 0)
7636 return err;
7637
354fe804
JH		 7638 hci_register_cb(&l2cap_cb);
7639
1120e4bf
MH		 7640 if (IS_ERR_OR_NULL(bt_debugfs))
7641 return 0;
7642
7643 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7644 NULL, &l2cap_debugfs_fops);
1da177e4 7645
40b9397a 7646 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
f15b8ecf 7647 &le_max_credits);
40b9397a 7648 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
f15b8ecf
JH		 7649 &le_default_mps);
7650
1da177e4 7651 return 0;
1da177e4
LT		 7652}
7653
64274518 7654void l2cap_exit(void)
1da177e4 7655{
aef7d97c 7656 debugfs_remove(l2cap_debugfs);
354fe804 7657 hci_unregister_cb(&l2cap_cb);
bb58f747 7658 l2cap_cleanup_sockets();
1da177e4
LT		 7659}
7660
d1c4a17d
GP		 7661module_param(disable_ertm, bool, 0644);
7662MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Ubuntu Artful kernel mirror