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Bluetooth: Do not access chan->sk directly
[deliverable/linux.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
422e925b 7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
1da177e4
LT		 8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
8e87d142
YH		 24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 26 SOFTWARE IS DISCLAIMED.
27*/
28
bb58f747 29/* Bluetooth L2CAP core. */
1da177e4 30
1da177e4
LT		 31#include <linux/module.h>
32
aef7d97c 33#include <linux/debugfs.h>
fcc203c3 34#include <linux/crc16.h>
1da177e4
LT		 35
36#include <net/bluetooth/bluetooth.h>
37#include <net/bluetooth/hci_core.h>
38#include <net/bluetooth/l2cap.h>
7ef9fbf0 39
ac4b7236 40#include "smp.h"
7024728e 41#include "a2mp.h"
7ef9fbf0 42#include "amp.h"
1da177e4 43
d1de6d46 44bool disable_ertm;
f0709e03 45
547d1032 46static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
d40bffbc 47static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, };
1da177e4 48
b5ad8b7f
JB		 49static LIST_HEAD(chan_list);
50static DEFINE_RWLOCK(chan_list_lock);
1da177e4 51
1da177e4 52static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 53 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 54static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 55 void *data);
710f9b0a 56static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 57static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 58
d660366d 59static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 60 struct sk_buff_head *skbs, u8 event);
608bcc6d 61
4f1654e0
MH		 62static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
63{
64 if (hcon->type == LE_LINK) {
65 if (type == ADDR_LE_DEV_PUBLIC)
66 return BDADDR_LE_PUBLIC;
67 else
68 return BDADDR_LE_RANDOM;
69 }
70
71 return BDADDR_BREDR;
72}
73
0139418c 74/* ---- L2CAP channels ---- */
71ba0e56 75
2d792818
GP		 76static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
77 u16 cid)
0139418c 78{
3df91ea2 79 struct l2cap_chan *c;
3d57dc68 80
3df91ea2
AE		 81 list_for_each_entry(c, &conn->chan_l, list) {
82 if (c->dcid == cid)
83 return c;
0139418c 84 }
3df91ea2 85 return NULL;
0139418c
MH		 86}
87
2d792818
GP		 88static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
89 u16 cid)
0139418c 90{
3df91ea2 91 struct l2cap_chan *c;
3d57dc68 92
3df91ea2
AE		 93 list_for_each_entry(c, &conn->chan_l, list) {
94 if (c->scid == cid)
95 return c;
0139418c 96 }
3df91ea2 97 return NULL;
0139418c
MH		 98}
99
100/* Find channel with given SCID.
ef191ade 101 * Returns locked channel. */
2d792818
GP		 102static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
103 u16 cid)
0139418c 104{
48454079 105 struct l2cap_chan *c;
baa7e1fa 106
3df91ea2 107 mutex_lock(&conn->chan_lock);
baa7e1fa 108 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 109 if (c)
110 l2cap_chan_lock(c);
3df91ea2
AE		 111 mutex_unlock(&conn->chan_lock);
112
48454079 113 return c;
0139418c
MH		 114}
115
b1a130b7
MM		 116/* Find channel with given DCID.
117 * Returns locked channel.
118 */
119static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
120 u16 cid)
121{
122 struct l2cap_chan *c;
123
124 mutex_lock(&conn->chan_lock);
125 c = __l2cap_get_chan_by_dcid(conn, cid);
126 if (c)
127 l2cap_chan_lock(c);
128 mutex_unlock(&conn->chan_lock);
129
130 return c;
131}
132
2d792818
GP		 133static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
134 u8 ident)
0139418c 135{
3df91ea2 136 struct l2cap_chan *c;
3d57dc68 137
3df91ea2
AE		 138 list_for_each_entry(c, &conn->chan_l, list) {
139 if (c->ident == ident)
140 return c;
0139418c 141 }
3df91ea2 142 return NULL;
0139418c
MH		 143}
144
5b155ef9
MM		 145static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
146 u8 ident)
147{
148 struct l2cap_chan *c;
149
150 mutex_lock(&conn->chan_lock);
151 c = __l2cap_get_chan_by_ident(conn, ident);
152 if (c)
153 l2cap_chan_lock(c);
154 mutex_unlock(&conn->chan_lock);
155
156 return c;
157}
158
23691d75 159static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 160{
23691d75 161 struct l2cap_chan *c;
9e4425ff 162
23691d75 163 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 164 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 165 return c;
9e4425ff 166 }
250938cb 167 return NULL;
9e4425ff
GP		 168}
169
170int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
171{
73b2ec18
GP		 172 int err;
173
333055f2 174 write_lock(&chan_list_lock);
9e4425ff 175
23691d75 176 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 177 err = -EADDRINUSE;
178 goto done;
9e4425ff
GP		 179 }
180
73b2ec18
GP		 181 if (psm) {
182 chan->psm = psm;
183 chan->sport = psm;
184 err = 0;
185 } else {
186 u16 p;
187
188 err = -EINVAL;
189 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 190 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 191 chan->psm = cpu_to_le16(p);
192 chan->sport = cpu_to_le16(p);
193 err = 0;
194 break;
195 }
196 }
9e4425ff 197
73b2ec18 198done:
333055f2 199 write_unlock(&chan_list_lock);
73b2ec18 200 return err;
9e4425ff
GP		 201}
202
203int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
204{
333055f2 205 write_lock(&chan_list_lock);
9e4425ff
GP		 206
207 chan->scid = scid;
208
333055f2 209 write_unlock(&chan_list_lock);
9e4425ff
GP		 210
211 return 0;
212}
213
baa7e1fa 214static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 215{
8db4dc46 216 u16 cid = L2CAP_CID_DYN_START;
0139418c 217
8db4dc46 218 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 219 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 220 return cid;
221 }
222
223 return 0;
224}
225
0e587be7 226static void __l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 227{
42d2d87c 228 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 229 state_to_string(state));
badaaa00 230
89bc500e 231 chan->state = state;
53f52121 232 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 233}
234
0e587be7
AE		 235static void l2cap_state_change(struct l2cap_chan *chan, int state)
236{
237 struct sock *sk = chan->sk;
238
239 lock_sock(sk);
240 __l2cap_state_change(chan, state);
241 release_sock(sk);
242}
243
f8e73017
GP		 244static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
245 int state, int err)
2e0052e4 246{
f8e73017
GP		 247 struct sock *sk = chan->sk;
248
249 lock_sock(sk);
250 chan->state = state;
53f52121 251 chan->ops->state_change(chan, chan->state, err);
f8e73017 252 release_sock(sk);
2e0052e4
AE		 253}
254
255static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
256{
257 struct sock *sk = chan->sk;
258
259 lock_sock(sk);
f8e73017 260 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 261 release_sock(sk);
262}
263
4239d16f
MM		 264static void __set_retrans_timer(struct l2cap_chan *chan)
265{
266 if (!delayed_work_pending(&chan->monitor_timer) &&
267 chan->retrans_timeout) {
268 l2cap_set_timer(chan, &chan->retrans_timer,
269 msecs_to_jiffies(chan->retrans_timeout));
270 }
271}
272
273static void __set_monitor_timer(struct l2cap_chan *chan)
274{
275 __clear_retrans_timer(chan);
276 if (chan->monitor_timeout) {
277 l2cap_set_timer(chan, &chan->monitor_timer,
278 msecs_to_jiffies(chan->monitor_timeout));
279 }
280}
281
608bcc6d
MM		 282static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
283 u16 seq)
284{
285 struct sk_buff *skb;
286
287 skb_queue_walk(head, skb) {
288 if (bt_cb(skb)->control.txseq == seq)
289 return skb;
290 }
291
292 return NULL;
293}
294
3c588192
MM		 295/* ---- L2CAP sequence number lists ---- */
296
297/* For ERTM, ordered lists of sequence numbers must be tracked for
298 * SREJ requests that are received and for frames that are to be
299 * retransmitted. These seq_list functions implement a singly-linked
300 * list in an array, where membership in the list can also be checked
301 * in constant time. Items can also be added to the tail of the list
302 * and removed from the head in constant time, without further memory
303 * allocs or frees.
304 */
305
306static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
307{
308 size_t alloc_size, i;
309
310 /* Allocated size is a power of 2 to map sequence numbers
311 * (which may be up to 14 bits) in to a smaller array that is
312 * sized for the negotiated ERTM transmit windows.
313 */
314 alloc_size = roundup_pow_of_two(size);
315
316 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
317 if (!seq_list->list)
318 return -ENOMEM;
319
320 seq_list->mask = alloc_size - 1;
321 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
322 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
323 for (i = 0; i < alloc_size; i++)
324 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
325
326 return 0;
327}
328
329static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
330{
331 kfree(seq_list->list);
332}
333
334static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
335 u16 seq)
336{
337 /* Constant-time check for list membership */
338 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
339}
340
341static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
342{
343 u16 mask = seq_list->mask;
344
345 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
346 /* In case someone tries to pop the head of an empty list */
347 return L2CAP_SEQ_LIST_CLEAR;
348 } else if (seq_list->head == seq) {
349 /* Head can be removed in constant time */
350 seq_list->head = seq_list->list[seq & mask];
351 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
352
353 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
354 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
355 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
356 }
357 } else {
358 /* Walk the list to find the sequence number */
359 u16 prev = seq_list->head;
360 while (seq_list->list[prev & mask] != seq) {
361 prev = seq_list->list[prev & mask];
362 if (prev == L2CAP_SEQ_LIST_TAIL)
363 return L2CAP_SEQ_LIST_CLEAR;
364 }
365
366 /* Unlink the number from the list and clear it */
367 seq_list->list[prev & mask] = seq_list->list[seq & mask];
368 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
369 if (seq_list->tail == seq)
370 seq_list->tail = prev;
371 }
372 return seq;
373}
374
375static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
376{
377 /* Remove the head in constant time */
378 return l2cap_seq_list_remove(seq_list, seq_list->head);
379}
380
381static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
382{
f522ae36 383 u16 i;
3c588192 384
f522ae36
GP		 385 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
386 return;
387
388 for (i = 0; i <= seq_list->mask; i++)
389 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
390
391 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
392 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 393}
394
395static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
396{
397 u16 mask = seq_list->mask;
398
399 /* All appends happen in constant time */
400
f522ae36
GP		 401 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
402 return;
3c588192 403
f522ae36
GP		 404 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
405 seq_list->head = seq;
406 else
407 seq_list->list[seq_list->tail & mask] = seq;
408
409 seq_list->tail = seq;
410 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 411}
412
721c4181 413static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 414{
721c4181 415 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 416 chan_timer.work);
3df91ea2 417 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 418 int reason;
419
e05dcc32 420 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 421
3df91ea2 422 mutex_lock(&conn->chan_lock);
6be36555 423 l2cap_chan_lock(chan);
ab07801d 424
89bc500e 425 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 426 reason = ECONNREFUSED;
89bc500e 427 else if (chan->state == BT_CONNECT &&
2d792818 428 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 429 reason = ECONNREFUSED;
430 else
431 reason = ETIMEDOUT;
432
0f852724 433 l2cap_chan_close(chan, reason);
ab07801d 434
6be36555 435 l2cap_chan_unlock(chan);
ab07801d 436
80b98027 437 chan->ops->close(chan);
3df91ea2
AE		 438 mutex_unlock(&conn->chan_lock);
439
371fd835 440 l2cap_chan_put(chan);
ab07801d
GP		 441}
442
eef1d9b6 443struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 444{
445 struct l2cap_chan *chan;
446
447 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
448 if (!chan)
449 return NULL;
450
c03b355e
AE		 451 mutex_init(&chan->lock);
452
333055f2 453 write_lock(&chan_list_lock);
23691d75 454 list_add(&chan->global_l, &chan_list);
333055f2 455 write_unlock(&chan_list_lock);
23691d75 456
721c4181 457 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 458
89bc500e
GP		 459 chan->state = BT_OPEN;
460
144ad330 461 kref_init(&chan->kref);
71ba0e56 462
2827011f
MM		 463 /* This flag is cleared in l2cap_chan_ready() */
464 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
465
eef1d9b6 466 BT_DBG("chan %p", chan);
abc545b8 467
48454079
GP		 468 return chan;
469}
470
144ad330 471static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 472{
144ad330
SS		 473 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
474
4af66c69
JK		 475 BT_DBG("chan %p", chan);
476
333055f2 477 write_lock(&chan_list_lock);
23691d75 478 list_del(&chan->global_l);
333055f2 479 write_unlock(&chan_list_lock);
23691d75 480
4af66c69 481 kfree(chan);
6ff5abbf
GP		 482}
483
30648372
JK		 484void l2cap_chan_hold(struct l2cap_chan *c)
485{
144ad330 486 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 487
144ad330 488 kref_get(&c->kref);
30648372
JK		 489}
490
491void l2cap_chan_put(struct l2cap_chan *c)
492{
144ad330 493 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 494
144ad330 495 kref_put(&c->kref, l2cap_chan_destroy);
30648372
JK		 496}
497
bd4b1653
AE		 498void l2cap_chan_set_defaults(struct l2cap_chan *chan)
499{
500 chan->fcs = L2CAP_FCS_CRC16;
501 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
502 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
503 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
c20f8e35 504 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653
AE		 505 chan->sec_level = BT_SECURITY_LOW;
506
507 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
508}
509
93c3e8f5 510void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 511{
af05b30b 512 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 513 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 514
9f5a0d7b 515 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 516
8c1d787b 517 chan->conn = conn;
0139418c 518
5491120e
AE		 519 switch (chan->chan_type) {
520 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b
VT		 521 if (conn->hcon->type == LE_LINK) {
522 /* LE connection */
6fcb06a2 523 chan->omtu = L2CAP_DEFAULT_MTU;
9f22398c
JH		 524 if (chan->dcid == L2CAP_CID_ATT)
525 chan->scid = L2CAP_CID_ATT;
526 else
527 chan->scid = l2cap_alloc_cid(conn);
b62f328b
VT		 528 } else {
529 /* Alloc CID for connection-oriented socket */
fe4128e0 530 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 531 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 532 }
5491120e
AE		 533 break;
534
535 case L2CAP_CHAN_CONN_LESS:
0139418c 536 /* Connectionless socket */
fe4128e0
GP		 537 chan->scid = L2CAP_CID_CONN_LESS;
538 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 539 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 540 break;
541
416fa752
AE		 542 case L2CAP_CHAN_CONN_FIX_A2MP:
543 chan->scid = L2CAP_CID_A2MP;
544 chan->dcid = L2CAP_CID_A2MP;
545 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
546 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
547 break;
548
5491120e 549 default:
0139418c 550 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 551 chan->scid = L2CAP_CID_SIGNALING;
552 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 553 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 554 }
555
8f7975b1
AE		 556 chan->local_id = L2CAP_BESTEFFORT_ID;
557 chan->local_stype = L2CAP_SERV_BESTEFFORT;
558 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
559 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
560 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 561 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 562
371fd835 563 l2cap_chan_hold(chan);
baa7e1fa 564
5ee9891d
JH		 565 hci_conn_hold(conn->hcon);
566
3df91ea2 567 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 568}
569
466f8004 570void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 571{
572 mutex_lock(&conn->chan_lock);
573 __l2cap_chan_add(conn, chan);
3df91ea2 574 mutex_unlock(&conn->chan_lock);
0139418c
MH		 575}
576
466f8004 577void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 578{
8c1d787b 579 struct l2cap_conn *conn = chan->conn;
0139418c 580
c9b66675 581 __clear_chan_timer(chan);
0139418c 582
49208c9c 583 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 584
8e87d142 585 if (conn) {
56f60984 586 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 587 /* Delete from channel list */
3df91ea2 588 list_del(&chan->list);
3d57dc68 589
371fd835 590 l2cap_chan_put(chan);
baa7e1fa 591
8c1d787b 592 chan->conn = NULL;
3cabbfda
AE		 593
594 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
76a68ba0 595 hci_conn_drop(conn->hcon);
56f60984
AE		 596
597 if (mgr && mgr->bredr_chan == chan)
598 mgr->bredr_chan = NULL;
0139418c
MH		 599 }
600
419e08c1
AE		 601 if (chan->hs_hchan) {
602 struct hci_chan *hs_hchan = chan->hs_hchan;
603
604 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
605 amp_disconnect_logical_link(hs_hchan);
606 }
607
b699ec0d 608 chan->ops->teardown(chan, err);
6be36555 609
2827011f 610 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 611 return;
2ead70b8 612
ee556f66
GP		 613 switch(chan->mode) {
614 case L2CAP_MODE_BASIC:
615 break;
c13ffa62 616
ee556f66 617 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 618 __clear_retrans_timer(chan);
619 __clear_monitor_timer(chan);
620 __clear_ack_timer(chan);
c13ffa62 621
f1c6775b 622 skb_queue_purge(&chan->srej_q);
c13ffa62 623
3c588192
MM		 624 l2cap_seq_list_free(&chan->srej_list);
625 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 626
627 /* fall through */
628
629 case L2CAP_MODE_STREAMING:
630 skb_queue_purge(&chan->tx_q);
631 break;
c13ffa62 632 }
ee556f66
GP		 633
634 return;
0139418c
MH		 635}
636
0f852724 637void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 638{
639 struct l2cap_conn *conn = chan->conn;
4519de9a 640
7eafc59e 641 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 642
89bc500e 643 switch (chan->state) {
4519de9a 644 case BT_LISTEN:
b699ec0d 645 chan->ops->teardown(chan, 0);
4519de9a
GP		 646 break;
647
648 case BT_CONNECTED:
649 case BT_CONFIG:
715ec005 650 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 651 conn->hcon->type == ACL_LINK) {
8d836d71 652 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 653 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 654 } else
655 l2cap_chan_del(chan, reason);
656 break;
657
658 case BT_CONNECT2:
715ec005 659 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 660 conn->hcon->type == ACL_LINK) {
4519de9a
GP		 661 struct l2cap_conn_rsp rsp;
662 __u16 result;
663
bdc25783 664 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
4519de9a
GP		 665 result = L2CAP_CR_SEC_BLOCK;
666 else
667 result = L2CAP_CR_BAD_PSM;
bdc25783 668
89bc500e 669 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 670
671 rsp.scid = cpu_to_le16(chan->dcid);
672 rsp.dcid = cpu_to_le16(chan->scid);
673 rsp.result = cpu_to_le16(result);
ac73498c 674 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4519de9a 675 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 676 sizeof(rsp), &rsp);
4519de9a
GP		 677 }
678
679 l2cap_chan_del(chan, reason);
680 break;
681
682 case BT_CONNECT:
683 case BT_DISCONN:
684 l2cap_chan_del(chan, reason);
685 break;
686
687 default:
b699ec0d 688 chan->ops->teardown(chan, 0);
4519de9a
GP		 689 break;
690 }
691}
692
4343478f 693static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 694{
6a974b50
MH		 695 switch (chan->chan_type) {
696 case L2CAP_CHAN_RAW:
4343478f 697 switch (chan->sec_level) {
8556edd3
JH		 698 case BT_SECURITY_HIGH:
699 return HCI_AT_DEDICATED_BONDING_MITM;
700 case BT_SECURITY_MEDIUM:
701 return HCI_AT_DEDICATED_BONDING;
702 default:
703 return HCI_AT_NO_BONDING;
704 }
6a974b50 705 break;
3124b843
MH		 706 case L2CAP_CHAN_CONN_LESS:
707 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) {
708 if (chan->sec_level == BT_SECURITY_LOW)
709 chan->sec_level = BT_SECURITY_SDP;
710 }
711 if (chan->sec_level == BT_SECURITY_HIGH)
712 return HCI_AT_NO_BONDING_MITM;
713 else
714 return HCI_AT_NO_BONDING;
715 break;
6a974b50
MH		 716 case L2CAP_CHAN_CONN_ORIENTED:
717 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
718 if (chan->sec_level == BT_SECURITY_LOW)
719 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 720
6a974b50
MH		 721 if (chan->sec_level == BT_SECURITY_HIGH)
722 return HCI_AT_NO_BONDING_MITM;
723 else
724 return HCI_AT_NO_BONDING;
725 }
726 /* fall through */
727 default:
4343478f 728 switch (chan->sec_level) {
00ae4af9 729 case BT_SECURITY_HIGH:
8556edd3 730 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 731 case BT_SECURITY_MEDIUM:
8556edd3 732 return HCI_AT_GENERAL_BONDING;
00ae4af9 733 default:
8556edd3 734 return HCI_AT_NO_BONDING;
00ae4af9 735 }
6a974b50 736 break;
0684e5f9 737 }
8556edd3
JH		 738}
739
740/* Service level security */
d45fc423 741int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 742{
8c1d787b 743 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 744 __u8 auth_type;
745
4343478f 746 auth_type = l2cap_get_auth_type(chan);
79d554a6 747
4343478f 748 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 749}
750
b5ad8b7f 751static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 752{
753 u8 id;
754
755 /* Get next available identificator.
756 * 1 - 128 are used by kernel.
757 * 129 - 199 are reserved.
758 * 200 - 254 are used by utilities like l2ping, etc.
759 */
760
333055f2 761 spin_lock(&conn->lock);
4e8402a3
MH		 762
763 if (++conn->tx_ident > 128)
764 conn->tx_ident = 1;
765
766 id = conn->tx_ident;
767
333055f2 768 spin_unlock(&conn->lock);
4e8402a3
MH		 769
770 return id;
771}
772
2d792818
GP		 773static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
774 void *data)
4e8402a3
MH		 775{
776 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 777 u8 flags;
4e8402a3
MH		 778
779 BT_DBG("code 0x%2.2x", code);
780
781 if (!skb)
9a9c6a34 782 return;
4e8402a3 783
e702112f
AE		 784 if (lmp_no_flush_capable(conn->hcon->hdev))
785 flags = ACL_START_NO_FLUSH;
786 else
787 flags = ACL_START;
788
14b12d0b 789 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 790 skb->priority = HCI_PRIO_MAX;
14b12d0b 791
73d80deb
LAD		 792 hci_send_acl(conn->hchan, skb, flags);
793}
794
02b0fbb9
MM		 795static bool __chan_is_moving(struct l2cap_chan *chan)
796{
797 return chan->move_state != L2CAP_MOVE_STABLE &&
798 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
799}
800
73d80deb
LAD		 801static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
802{
803 struct hci_conn *hcon = chan->conn->hcon;
804 u16 flags;
805
806 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 807 skb->priority);
73d80deb 808
d5f8a75d
MM		 809 if (chan->hs_hcon && !__chan_is_moving(chan)) {
810 if (chan->hs_hchan)
811 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
812 else
813 kfree_skb(skb);
814
815 return;
816 }
817
73d80deb 818 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 819 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 820 flags = ACL_START_NO_FLUSH;
821 else
822 flags = ACL_START;
14b12d0b 823
73d80deb
LAD		 824 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
825 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 826}
827
b76bbd66
MM		 828static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
829{
830 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
831 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
832
833 if (enh & L2CAP_CTRL_FRAME_TYPE) {
834 /* S-Frame */
835 control->sframe = 1;
836 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
837 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
838
839 control->sar = 0;
840 control->txseq = 0;
841 } else {
842 /* I-Frame */
843 control->sframe = 0;
844 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
845 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
846
847 control->poll = 0;
848 control->super = 0;
849 }
850}
851
b76bbd66
MM		 852static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
853{
854 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
855 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
856
857 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
858 /* S-Frame */
859 control->sframe = 1;
860 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
861 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
862
863 control->sar = 0;
864 control->txseq = 0;
865 } else {
866 /* I-Frame */
867 control->sframe = 0;
868 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
869 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
870
871 control->poll = 0;
872 control->super = 0;
873 }
874}
875
876static inline void __unpack_control(struct l2cap_chan *chan,
877 struct sk_buff *skb)
878{
879 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
880 __unpack_extended_control(get_unaligned_le32(skb->data),
881 &bt_cb(skb)->control);
cec8ab6e 882 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 883 } else {
884 __unpack_enhanced_control(get_unaligned_le16(skb->data),
885 &bt_cb(skb)->control);
cec8ab6e 886 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 887 }
888}
889
b5c6aaed
MM		 890static u32 __pack_extended_control(struct l2cap_ctrl *control)
891{
892 u32 packed;
893
894 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
895 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
896
897 if (control->sframe) {
898 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
899 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
900 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
901 } else {
902 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
903 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
904 }
905
906 return packed;
907}
908
909static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
910{
911 u16 packed;
912
913 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
914 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
915
916 if (control->sframe) {
917 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
918 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
919 packed |= L2CAP_CTRL_FRAME_TYPE;
920 } else {
921 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
922 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
923 }
924
925 return packed;
926}
927
b76bbd66
MM		 928static inline void __pack_control(struct l2cap_chan *chan,
929 struct l2cap_ctrl *control,
930 struct sk_buff *skb)
931{
932 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
933 put_unaligned_le32(__pack_extended_control(control),
934 skb->data + L2CAP_HDR_SIZE);
935 } else {
936 put_unaligned_le16(__pack_enhanced_control(control),
937 skb->data + L2CAP_HDR_SIZE);
938 }
939}
940
ba7aa64f
GP		 941static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
942{
943 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
944 return L2CAP_EXT_HDR_SIZE;
945 else
946 return L2CAP_ENH_HDR_SIZE;
947}
948
a67d7f6f
MM		 949static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
950 u32 control)
b5c6aaed
MM		 951{
952 struct sk_buff *skb;
953 struct l2cap_hdr *lh;
ba7aa64f 954 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 955
956 if (chan->fcs == L2CAP_FCS_CRC16)
957 hlen += L2CAP_FCS_SIZE;
958
a67d7f6f 959 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 960
b5c6aaed 961 if (!skb)
a67d7f6f 962 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 963
964 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
965 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
966 lh->cid = cpu_to_le16(chan->dcid);
967
a67d7f6f
MM		 968 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
969 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
970 else
971 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 972
973 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 974 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 975 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
976 }
977
978 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 979 return skb;
980}
981
982static void l2cap_send_sframe(struct l2cap_chan *chan,
983 struct l2cap_ctrl *control)
984{
985 struct sk_buff *skb;
986 u32 control_field;
987
988 BT_DBG("chan %p, control %p", chan, control);
989
990 if (!control->sframe)
991 return;
992
b99e13ad
MM		 993 if (__chan_is_moving(chan))
994 return;
995
a67d7f6f
MM		 996 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
997 !control->poll)
998 control->final = 1;
999
1000 if (control->super == L2CAP_SUPER_RR)
1001 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1002 else if (control->super == L2CAP_SUPER_RNR)
1003 set_bit(CONN_RNR_SENT, &chan->conn_state);
1004
1005 if (control->super != L2CAP_SUPER_SREJ) {
1006 chan->last_acked_seq = control->reqseq;
1007 __clear_ack_timer(chan);
1008 }
1009
1010 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1011 control->final, control->poll, control->super);
1012
1013 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1014 control_field = __pack_extended_control(control);
1015 else
1016 control_field = __pack_enhanced_control(control);
1017
1018 skb = l2cap_create_sframe_pdu(chan, control_field);
1019 if (!IS_ERR(skb))
1020 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1021}
1022
c9e3d5e0 1023static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1024{
c9e3d5e0
MM		 1025 struct l2cap_ctrl control;
1026
1027 BT_DBG("chan %p, poll %d", chan, poll);
1028
1029 memset(&control, 0, sizeof(control));
1030 control.sframe = 1;
1031 control.poll = poll;
1032
1033 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1034 control.super = L2CAP_SUPER_RNR;
1035 else
1036 control.super = L2CAP_SUPER_RR;
b5c6aaed 1037
c9e3d5e0
MM		 1038 control.reqseq = chan->buffer_seq;
1039 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1040}
1041
b4450035 1042static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1043{
c1360a1c 1044 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1045}
1046
1df7b17a 1047static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1048{
1df7b17a 1049 struct l2cap_conn *conn = chan->conn;
80d58d0b 1050 struct hci_dev *hdev;
1df7b17a
MH		 1051 bool amp_available = false;
1052
1053 if (!conn->hs_enabled)
1054 return false;
1055
1056 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1057 return false;
80d58d0b
MH		 1058
1059 read_lock(&hci_dev_list_lock);
1df7b17a 1060 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1061 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1062 test_bit(HCI_UP, &hdev->flags)) {
1063 amp_available = true;
1064 break;
1065 }
1066 }
80d58d0b
MH		 1067 read_unlock(&hci_dev_list_lock);
1068
1df7b17a
MH		 1069 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1070 return amp_available;
848566b3
MH		 1071
1072 return false;
93c3e8f5
AE		 1073}
1074
5ce66b59
AE		 1075static bool l2cap_check_efs(struct l2cap_chan *chan)
1076{
1077 /* Check EFS parameters */
1078 return true;
1079}
1080
2766be48 1081void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1082{
1083 struct l2cap_conn *conn = chan->conn;
1084 struct l2cap_conn_req req;
1085
1086 req.scid = cpu_to_le16(chan->scid);
1087 req.psm = chan->psm;
1088
1089 chan->ident = l2cap_get_ident(conn);
1090
1091 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1092
1093 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1094}
1095
8eb200bd
MM		 1096static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1097{
1098 struct l2cap_create_chan_req req;
1099 req.scid = cpu_to_le16(chan->scid);
1100 req.psm = chan->psm;
1101 req.amp_id = amp_id;
1102
1103 chan->ident = l2cap_get_ident(chan->conn);
1104
1105 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1106 sizeof(req), &req);
1107}
1108
02b0fbb9
MM		 1109static void l2cap_move_setup(struct l2cap_chan *chan)
1110{
1111 struct sk_buff *skb;
1112
1113 BT_DBG("chan %p", chan);
1114
1115 if (chan->mode != L2CAP_MODE_ERTM)
1116 return;
1117
1118 __clear_retrans_timer(chan);
1119 __clear_monitor_timer(chan);
1120 __clear_ack_timer(chan);
1121
1122 chan->retry_count = 0;
1123 skb_queue_walk(&chan->tx_q, skb) {
1124 if (bt_cb(skb)->control.retries)
1125 bt_cb(skb)->control.retries = 1;
1126 else
1127 break;
1128 }
1129
1130 chan->expected_tx_seq = chan->buffer_seq;
1131
1132 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1133 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1134 l2cap_seq_list_clear(&chan->retrans_list);
1135 l2cap_seq_list_clear(&chan->srej_list);
1136 skb_queue_purge(&chan->srej_q);
1137
1138 chan->tx_state = L2CAP_TX_STATE_XMIT;
1139 chan->rx_state = L2CAP_RX_STATE_MOVE;
1140
1141 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1142}
1143
5f3847a4
MM		 1144static void l2cap_move_done(struct l2cap_chan *chan)
1145{
1146 u8 move_role = chan->move_role;
1147 BT_DBG("chan %p", chan);
1148
1149 chan->move_state = L2CAP_MOVE_STABLE;
1150 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1151
1152 if (chan->mode != L2CAP_MODE_ERTM)
1153 return;
1154
1155 switch (move_role) {
1156 case L2CAP_MOVE_ROLE_INITIATOR:
1157 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1158 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1159 break;
1160 case L2CAP_MOVE_ROLE_RESPONDER:
1161 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1162 break;
1163 }
1164}
1165
9f0caeb1
VCG		 1166static void l2cap_chan_ready(struct l2cap_chan *chan)
1167{
2827011f 1168 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1169 chan->conf_state = 0;
1170 __clear_chan_timer(chan);
1171
54a59aa2 1172 chan->state = BT_CONNECTED;
9f0caeb1 1173
fd83e2c2 1174 chan->ops->ready(chan);
9f0caeb1
VCG		 1175}
1176
93c3e8f5
AE		 1177static void l2cap_start_connection(struct l2cap_chan *chan)
1178{
1179 if (__amp_capable(chan)) {
1180 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1181 a2mp_discover_amp(chan);
1182 } else {
1183 l2cap_send_conn_req(chan);
1184 }
1185}
1186
fc7f8a7e 1187static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1188{
8c1d787b 1189 struct l2cap_conn *conn = chan->conn;
79d554a6 1190
9f0caeb1
VCG		 1191 if (conn->hcon->type == LE_LINK) {
1192 l2cap_chan_ready(chan);
1193 return;
1194 }
1195
79d554a6 1196 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1197 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1198 return;
1199
d45fc423 1200 if (l2cap_chan_check_security(chan) &&
2d792818 1201 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1202 l2cap_start_connection(chan);
1203 }
79d554a6
MH		 1204 } else {
1205 struct l2cap_info_req req;
ac73498c 1206 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1207
1208 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1209 conn->info_ident = l2cap_get_ident(conn);
1210
ba13ccd9 1211 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1212
2d792818
GP		 1213 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1214 sizeof(req), &req);
79d554a6
MH		 1215 }
1216}
1217
cf6c2c0b
GP		 1218static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1219{
1220 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1221 if (!disable_ertm)
cf6c2c0b
GP		 1222 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1223
1224 switch (mode) {
1225 case L2CAP_MODE_ERTM:
1226 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1227 case L2CAP_MODE_STREAMING:
1228 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1229 default:
1230 return 0x00;
1231 }
1232}
1233
5e4e3972 1234static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1235{
5e4e3972 1236 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1237 struct l2cap_disconn_req req;
1238
c13ffa62
GP		 1239 if (!conn)
1240 return;
1241
aad3d0e3 1242 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1243 __clear_retrans_timer(chan);
1244 __clear_monitor_timer(chan);
1245 __clear_ack_timer(chan);
c13ffa62
GP		 1246 }
1247
416fa752 1248 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
d117773c 1249 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1250 return;
1251 }
1252
fe4128e0
GP		 1253 req.dcid = cpu_to_le16(chan->dcid);
1254 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1255 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1256 sizeof(req), &req);
c13ffa62 1257
f8e73017 1258 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1259}
1260
1da177e4 1261/* ---- L2CAP connections ---- */
4e8402a3
MH		 1262static void l2cap_conn_start(struct l2cap_conn *conn)
1263{
3df91ea2 1264 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1265
1266 BT_DBG("conn %p", conn);
1267
3df91ea2 1268 mutex_lock(&conn->chan_lock);
4e8402a3 1269
3df91ea2 1270 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1271 l2cap_chan_lock(chan);
4e8402a3 1272
715ec005 1273 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1274 l2cap_chan_unlock(chan);
79d554a6
MH		 1275 continue;
1276 }
1277
89bc500e 1278 if (chan->state == BT_CONNECT) {
d45fc423 1279 if (!l2cap_chan_check_security(chan) ||
2d792818 1280 !__l2cap_no_conn_pending(chan)) {
6be36555 1281 l2cap_chan_unlock(chan);
47731de7
GP		 1282 continue;
1283 }
79d554a6 1284
c1360a1c 1285 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1286 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1287 &chan->conf_state)) {
89bc500e 1288 l2cap_chan_close(chan, ECONNRESET);
6be36555 1289 l2cap_chan_unlock(chan);
47731de7 1290 continue;
b1235d79 1291 }
47731de7 1292
93c3e8f5 1293 l2cap_start_connection(chan);
47731de7 1294
89bc500e 1295 } else if (chan->state == BT_CONNECT2) {
79d554a6 1296 struct l2cap_conn_rsp rsp;
e9aeb2dd 1297 char buf[128];
fe4128e0
GP		 1298 rsp.scid = cpu_to_le16(chan->dcid);
1299 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1300
d45fc423 1301 if (l2cap_chan_check_security(chan)) {
bdc25783
MH		 1302 struct sock *sk = chan->sk;
1303
6be36555 1304 lock_sock(sk);
bdc25783 1305 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
ac73498c
AE		 1306 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1307 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1308 chan->ops->defer(chan);
f66dc81f
MH		 1309
1310 } else {
0e587be7 1311 __l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1312 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1313 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1314 }
6be36555 1315 release_sock(sk);
79d554a6 1316 } else {
ac73498c
AE		 1317 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1318 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1319 }
1320
fc7f8a7e 1321 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1322 sizeof(rsp), &rsp);
e9aeb2dd 1323
c1360a1c 1324 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1325 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1326 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1327 continue;
1328 }
1329
c1360a1c 1330 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1331 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1332 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1333 chan->num_conf_req++;
4e8402a3
MH		 1334 }
1335
6be36555 1336 l2cap_chan_unlock(chan);
4e8402a3
MH		 1337 }
1338
3df91ea2 1339 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1340}
1341
c2287681 1342/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1343 * Returns closest match, locked.
1344 */
d9b88702 1345static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1346 bdaddr_t *src,
1347 bdaddr_t *dst)
b62f328b 1348{
23691d75 1349 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1350
23691d75 1351 read_lock(&chan_list_lock);
b62f328b 1352
23691d75 1353 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1354 if (state && c->state != state)
b62f328b
VT		 1355 continue;
1356
23691d75 1357 if (c->scid == cid) {
c2287681
IY		 1358 int src_match, dst_match;
1359 int src_any, dst_any;
1360
b62f328b 1361 /* Exact match. */
7eafc59e
MH		 1362 src_match = !bacmp(&c->src, src);
1363 dst_match = !bacmp(&c->dst, dst);
c2287681 1364 if (src_match && dst_match) {
23691d75
GP		 1365 read_unlock(&chan_list_lock);
1366 return c;
1367 }
b62f328b
VT		 1368
1369 /* Closest match */
7eafc59e
MH		 1370 src_any = !bacmp(&c->src, BDADDR_ANY);
1371 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1372 if ((src_match && dst_any) || (src_any && dst_match) ||
1373 (src_any && dst_any))
23691d75 1374 c1 = c;
b62f328b
VT		 1375 }
1376 }
280f294f 1377
23691d75 1378 read_unlock(&chan_list_lock);
b62f328b 1379
23691d75 1380 return c1;
b62f328b
VT		 1381}
1382
1383static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1384{
cc8dba2b 1385 struct hci_conn *hcon = conn->hcon;
60bac184 1386 struct sock *parent;
23691d75 1387 struct l2cap_chan *chan, *pchan;
cc8dba2b 1388 u8 dst_type;
b62f328b
VT		 1389
1390 BT_DBG("");
1391
1392 /* Check if we have socket listening on cid */
073d1cf3 1393 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
cc8dba2b 1394 &hcon->src, &hcon->dst);
23691d75 1395 if (!pchan)
b62f328b
VT		 1396 return;
1397
44f3b0fb
JH		 1398 /* Client ATT sockets should override the server one */
1399 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1400 return;
1401
cc8dba2b
MH		 1402 dst_type = bdaddr_type(hcon, hcon->dst_type);
1403
1404 /* If device is blocked, do not create a channel for it */
1405 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type))
1406 return;
1407
23691d75
GP		 1408 parent = pchan->sk;
1409
aa2ac881 1410 lock_sock(parent);
62f3a2cf 1411
80b98027 1412 chan = pchan->ops->new_connection(pchan);
80808e43 1413 if (!chan)
b62f328b
VT		 1414 goto clean;
1415
9f22398c
JH		 1416 chan->dcid = L2CAP_CID_ATT;
1417
cc8dba2b
MH		 1418 bacpy(&chan->src, &hcon->src);
1419 bacpy(&chan->dst, &hcon->dst);
1420 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1421 chan->dst_type = dst_type;
b62f328b 1422
44f3b0fb 1423 __l2cap_chan_add(conn, chan);
48454079 1424
b62f328b 1425clean:
aa2ac881 1426 release_sock(parent);
b62f328b
VT		 1427}
1428
4e8402a3
MH		 1429static void l2cap_conn_ready(struct l2cap_conn *conn)
1430{
48454079 1431 struct l2cap_chan *chan;
cc110922 1432 struct hci_conn *hcon = conn->hcon;
4e8402a3 1433
79d554a6 1434 BT_DBG("conn %p", conn);
4e8402a3 1435
d8729922
JH		 1436 /* For outgoing pairing which doesn't necessarily have an
1437 * associated socket (e.g. mgmt_pair_device).
1438 */
cc110922
VCG		 1439 if (hcon->out && hcon->type == LE_LINK)
1440 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1441
3df91ea2 1442 mutex_lock(&conn->chan_lock);
4e8402a3 1443
44f3b0fb
JH		 1444 if (hcon->type == LE_LINK)
1445 l2cap_le_conn_ready(conn);
1446
3df91ea2 1447 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1448
6be36555 1449 l2cap_chan_lock(chan);
4e8402a3 1450
416fa752
AE		 1451 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1452 l2cap_chan_unlock(chan);
1453 continue;
1454 }
1455
cc110922
VCG		 1456 if (hcon->type == LE_LINK) {
1457 if (smp_conn_security(hcon, chan->sec_level))
cf4cd009 1458 l2cap_chan_ready(chan);
acd7d370 1459
63128451 1460 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
74e75740 1461 l2cap_chan_ready(chan);
b501d6a1 1462
1c244f79 1463 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1464 l2cap_do_start(chan);
1c244f79 1465 }
4e8402a3 1466
6be36555 1467 l2cap_chan_unlock(chan);
4e8402a3 1468 }
79d554a6 1469
3df91ea2 1470 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1471}
1472
1473/* Notify sockets that we cannot guaranty reliability anymore */
1474static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1475{
48454079 1476 struct l2cap_chan *chan;
4e8402a3
MH		 1477
1478 BT_DBG("conn %p", conn);
1479
3df91ea2 1480 mutex_lock(&conn->chan_lock);
4e8402a3 1481
3df91ea2 1482 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1483 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1484 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1485 }
1486
3df91ea2 1487 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1488}
1489
f878fcad 1490static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1491{
f878fcad 1492 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1493 info_timer.work);
4e8402a3 1494
984947dc 1495 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1496 conn->info_ident = 0;
984947dc 1497
4e8402a3
MH		 1498 l2cap_conn_start(conn);
1499}
1500
2c8e1411
DH		 1501/*
1502 * l2cap_user
1503 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1504 * callback is called during registration. The ->remove callback is called
1505 * during unregistration.
1506 * An l2cap_user object can either be explicitly unregistered or when the
1507 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1508 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1509 * External modules must own a reference to the l2cap_conn object if they intend
1510 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1511 * any time if they don't.
1512 */
1513
1514int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1515{
1516 struct hci_dev *hdev = conn->hcon->hdev;
1517 int ret;
1518
1519 /* We need to check whether l2cap_conn is registered. If it is not, we
1520 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1521 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1522 * relies on the parent hci_conn object to be locked. This itself relies
1523 * on the hci_dev object to be locked. So we must lock the hci device
1524 * here, too. */
1525
1526 hci_dev_lock(hdev);
1527
1528 if (user->list.next || user->list.prev) {
1529 ret = -EINVAL;
1530 goto out_unlock;
1531 }
1532
1533 /* conn->hchan is NULL after l2cap_conn_del() was called */
1534 if (!conn->hchan) {
1535 ret = -ENODEV;
1536 goto out_unlock;
1537 }
1538
1539 ret = user->probe(conn, user);
1540 if (ret)
1541 goto out_unlock;
1542
1543 list_add(&user->list, &conn->users);
1544 ret = 0;
1545
1546out_unlock:
1547 hci_dev_unlock(hdev);
1548 return ret;
1549}
1550EXPORT_SYMBOL(l2cap_register_user);
1551
1552void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1553{
1554 struct hci_dev *hdev = conn->hcon->hdev;
1555
1556 hci_dev_lock(hdev);
1557
1558 if (!user->list.next || !user->list.prev)
1559 goto out_unlock;
1560
1561 list_del(&user->list);
1562 user->list.next = NULL;
1563 user->list.prev = NULL;
1564 user->remove(conn, user);
1565
1566out_unlock:
1567 hci_dev_unlock(hdev);
1568}
1569EXPORT_SYMBOL(l2cap_unregister_user);
1570
1571static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1572{
1573 struct l2cap_user *user;
1574
1575 while (!list_empty(&conn->users)) {
1576 user = list_first_entry(&conn->users, struct l2cap_user, list);
1577 list_del(&user->list);
1578 user->list.next = NULL;
1579 user->list.prev = NULL;
1580 user->remove(conn, user);
1581 }
1582}
1583
5d3de7df
VCG		 1584static void l2cap_conn_del(struct hci_conn *hcon, int err)
1585{
1586 struct l2cap_conn *conn = hcon->l2cap_data;
1587 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1588
1589 if (!conn)
1590 return;
1591
1592 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1593
1594 kfree_skb(conn->rx_skb);
1595
2c8e1411
DH		 1596 l2cap_unregister_all_users(conn);
1597
3df91ea2
AE		 1598 mutex_lock(&conn->chan_lock);
1599
5d3de7df
VCG		 1600 /* Kill channels */
1601 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1602 l2cap_chan_hold(chan);
6be36555
AE		 1603 l2cap_chan_lock(chan);
1604
5d3de7df 1605 l2cap_chan_del(chan, err);
6be36555
AE		 1606
1607 l2cap_chan_unlock(chan);
1608
80b98027 1609 chan->ops->close(chan);
61d6ef3e 1610 l2cap_chan_put(chan);
5d3de7df
VCG		 1611 }
1612
3df91ea2
AE		 1613 mutex_unlock(&conn->chan_lock);
1614
73d80deb
LAD		 1615 hci_chan_del(conn->hchan);
1616
5d3de7df 1617 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1618 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1619
51a8efd7 1620 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1621 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1622 smp_chan_destroy(conn);
d26a2345 1623 }
5d3de7df
VCG		 1624
1625 hcon->l2cap_data = NULL;
9c903e37
DH		 1626 conn->hchan = NULL;
1627 l2cap_conn_put(conn);
5d3de7df
VCG		 1628}
1629
6c9d42a1 1630static void security_timeout(struct work_struct *work)
5d3de7df 1631{
6c9d42a1 1632 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1633 security_timer.work);
5d3de7df 1634
d06cc416
JH		 1635 BT_DBG("conn %p", conn);
1636
1637 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1638 smp_chan_destroy(conn);
1639 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1640 }
5d3de7df
VCG		 1641}
1642
baf43251 1643static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
1da177e4 1644{
0139418c 1645 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1646 struct hci_chan *hchan;
1da177e4 1647
baf43251 1648 if (conn)
1da177e4
LT		 1649 return conn;
1650
73d80deb
LAD		 1651 hchan = hci_chan_create(hcon);
1652 if (!hchan)
1653 return NULL;
1654
8bcde1f2 1655 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
73d80deb
LAD		 1656 if (!conn) {
1657 hci_chan_del(hchan);
1da177e4 1658 return NULL;
73d80deb 1659 }
1da177e4 1660
9c903e37 1661 kref_init(&conn->ref);
1da177e4
LT		 1662 hcon->l2cap_data = conn;
1663 conn->hcon = hcon;
9c903e37 1664 hci_conn_get(conn->hcon);
73d80deb 1665 conn->hchan = hchan;
1da177e4 1666
73d80deb 1667 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1668
dcc042d5 1669 switch (hcon->type) {
dcc042d5
AE		 1670 case LE_LINK:
1671 if (hcon->hdev->le_mtu) {
1672 conn->mtu = hcon->hdev->le_mtu;
1673 break;
1674 }
1675 /* fall through */
dcc042d5 1676 default:
acd7d370 1677 conn->mtu = hcon->hdev->acl_mtu;
dcc042d5
AE		 1678 break;
1679 }
acd7d370 1680
4e8402a3
MH		 1681 conn->feat_mask = 0;
1682
848566b3
MH		 1683 if (hcon->type == ACL_LINK)
1684 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
1685 &hcon->hdev->dev_flags);
1686
1da177e4 1687 spin_lock_init(&conn->lock);
3df91ea2 1688 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1689
1690 INIT_LIST_HEAD(&conn->chan_l);
2c8e1411 1691 INIT_LIST_HEAD(&conn->users);
1da177e4 1692
5d3de7df 1693 if (hcon->type == LE_LINK)
6c9d42a1 1694 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1695 else
030013d8 1696 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1697
9f5a0d7b 1698 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1699
1da177e4
LT		 1700 return conn;
1701}
1702
9c903e37
DH		 1703static void l2cap_conn_free(struct kref *ref)
1704{
1705 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1706
1707 hci_conn_put(conn->hcon);
1708 kfree(conn);
1709}
1710
1711void l2cap_conn_get(struct l2cap_conn *conn)
1712{
1713 kref_get(&conn->ref);
1714}
1715EXPORT_SYMBOL(l2cap_conn_get);
1716
1717void l2cap_conn_put(struct l2cap_conn *conn)
1718{
1719 kref_put(&conn->ref, l2cap_conn_free);
1720}
1721EXPORT_SYMBOL(l2cap_conn_put);
1722
1da177e4 1723/* ---- Socket interface ---- */
1da177e4 1724
c2287681 1725/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1726 * Returns closest match.
1727 */
c2287681
IY		 1728static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1729 bdaddr_t *src,
1730 bdaddr_t *dst)
1da177e4 1731{
23691d75 1732 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1733
23691d75 1734 read_lock(&chan_list_lock);
e0f0cb56 1735
23691d75 1736 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1737 if (state && c->state != state)
1da177e4
LT		 1738 continue;
1739
23691d75 1740 if (c->psm == psm) {
c2287681
IY		 1741 int src_match, dst_match;
1742 int src_any, dst_any;
1743
1da177e4 1744 /* Exact match. */
7eafc59e
MH		 1745 src_match = !bacmp(&c->src, src);
1746 dst_match = !bacmp(&c->dst, dst);
c2287681 1747 if (src_match && dst_match) {
a7567b20 1748 read_unlock(&chan_list_lock);
23691d75
GP		 1749 return c;
1750 }
1da177e4
LT		 1751
1752 /* Closest match */
7eafc59e
MH		 1753 src_any = !bacmp(&c->src, BDADDR_ANY);
1754 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1755 if ((src_match && dst_any) || (src_any && dst_match) ||
1756 (src_any && dst_any))
23691d75 1757 c1 = c;
1da177e4
LT		 1758 }
1759 }
1da177e4 1760
23691d75 1761 read_unlock(&chan_list_lock);
e0f0cb56 1762
23691d75 1763 return c1;
1da177e4
LT		 1764}
1765
8e9f9892
AG		 1766int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1767 bdaddr_t *dst, u8 dst_type)
1da177e4 1768{
1da177e4
LT		 1769 struct l2cap_conn *conn;
1770 struct hci_conn *hcon;
1771 struct hci_dev *hdev;
09ab6f4c 1772 __u8 auth_type;
44d0e48e 1773 int err;
1da177e4 1774
7eafc59e 1775 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
ab19516a 1776 dst_type, __le16_to_cpu(psm));
1da177e4 1777
7eafc59e 1778 hdev = hci_get_route(dst, &chan->src);
af05b30b 1779 if (!hdev)
1da177e4
LT		 1780 return -EHOSTUNREACH;
1781
09fd0de5 1782 hci_dev_lock(hdev);
1da177e4 1783
6be36555 1784 l2cap_chan_lock(chan);
03a00194
GP		 1785
1786 /* PSM must be odd and lsb of upper byte must be 0 */
1787 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
2d792818 1788 chan->chan_type != L2CAP_CHAN_RAW) {
03a00194
GP		 1789 err = -EINVAL;
1790 goto done;
1791 }
1792
1793 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1794 err = -EINVAL;
1795 goto done;
1796 }
1797
1798 switch (chan->mode) {
1799 case L2CAP_MODE_BASIC:
1800 break;
1801 case L2CAP_MODE_ERTM:
1802 case L2CAP_MODE_STREAMING:
1803 if (!disable_ertm)
1804 break;
1805 /* fall through */
1806 default:
1807 err = -ENOTSUPP;
1808 goto done;
1809 }
1810
0797e01d 1811 switch (chan->state) {
03a00194
GP		 1812 case BT_CONNECT:
1813 case BT_CONNECT2:
1814 case BT_CONFIG:
1815 /* Already connecting */
1816 err = 0;
1817 goto done;
1818
1819 case BT_CONNECTED:
1820 /* Already connected */
1821 err = -EISCONN;
1822 goto done;
1823
1824 case BT_OPEN:
1825 case BT_BOUND:
1826 /* Can connect */
1827 break;
1828
1829 default:
1830 err = -EBADFD;
1831 goto done;
1832 }
1833
1834 /* Set destination address and psm */
7eafc59e 1835 bacpy(&chan->dst, dst);
4f1654e0 1836 chan->dst_type = dst_type;
6be36555 1837
03a00194
GP		 1838 chan->psm = psm;
1839 chan->dcid = cid;
1da177e4 1840
4343478f 1841 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1842
f224ca5f 1843 if (bdaddr_type_is_le(dst_type))
8e9f9892 1844 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1845 chan->sec_level, auth_type);
acd7d370 1846 else
8e9f9892 1847 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1848 chan->sec_level, auth_type);
acd7d370 1849
30e76272
VT		 1850 if (IS_ERR(hcon)) {
1851 err = PTR_ERR(hcon);
1da177e4 1852 goto done;
30e76272 1853 }
1da177e4 1854
baf43251 1855 conn = l2cap_conn_add(hcon);
1da177e4 1856 if (!conn) {
76a68ba0 1857 hci_conn_drop(hcon);
30e76272 1858 err = -ENOMEM;
1da177e4
LT		 1859 goto done;
1860 }
1861
141d5706
JH		 1862 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
1863 hci_conn_drop(hcon);
1864 err = -EBUSY;
1865 goto done;
9f0caeb1
VCG		 1866 }
1867
1da177e4 1868 /* Update source addr of the socket */
7eafc59e 1869 bacpy(&chan->src, &hcon->src);
4f1654e0 1870 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1da177e4 1871
6be36555 1872 l2cap_chan_unlock(chan);
48454079 1873 l2cap_chan_add(conn, chan);
6be36555 1874 l2cap_chan_lock(chan);
48454079 1875
5ee9891d
JH		 1876 /* l2cap_chan_add takes its own ref so we can drop this one */
1877 hci_conn_drop(hcon);
1878
6be36555 1879 l2cap_state_change(chan, BT_CONNECT);
8d836d71 1880 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4
LT		 1881
1882 if (hcon->state == BT_CONNECTED) {
715ec005 1883 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1884 __clear_chan_timer(chan);
d45fc423 1885 if (l2cap_chan_check_security(chan))
6be36555 1886 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1887 } else
fc7f8a7e 1888 l2cap_do_start(chan);
1da177e4
LT		 1889 }
1890
30e76272
VT		 1891 err = 0;
1892
1da177e4 1893done:
6be36555 1894 l2cap_chan_unlock(chan);
09fd0de5 1895 hci_dev_unlock(hdev);
1da177e4
LT		 1896 hci_dev_put(hdev);
1897 return err;
1898}
1899
721c4181 1900static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1901{
721c4181 1902 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1903 monitor_timer.work);
e90bac06 1904
525cd185 1905 BT_DBG("chan %p", chan);
0e98958d 1906
6be36555
AE		 1907 l2cap_chan_lock(chan);
1908
80909e04 1909 if (!chan->conn) {
6be36555 1910 l2cap_chan_unlock(chan);
8d7e1c7f 1911 l2cap_chan_put(chan);
e90bac06
GP		 1912 return;
1913 }
1914
401bb1f7 1915 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1916
6be36555 1917 l2cap_chan_unlock(chan);
8d7e1c7f 1918 l2cap_chan_put(chan);
e90bac06
GP		 1919}
1920
721c4181 1921static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1922{
721c4181 1923 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1924 retrans_timer.work);
e90bac06 1925
49208c9c 1926 BT_DBG("chan %p", chan);
0e98958d 1927
6be36555
AE		 1928 l2cap_chan_lock(chan);
1929
80909e04
MM		 1930 if (!chan->conn) {
1931 l2cap_chan_unlock(chan);
1932 l2cap_chan_put(chan);
1933 return;
1934 }
6be36555 1935
401bb1f7 1936 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1937 l2cap_chan_unlock(chan);
8d7e1c7f 1938 l2cap_chan_put(chan);
e90bac06
GP		 1939}
1940
d660366d
GP		 1941static void l2cap_streaming_send(struct l2cap_chan *chan,
1942 struct sk_buff_head *skbs)
6840ed07 1943{
ccbb84af 1944 struct sk_buff *skb;
3733937d 1945 struct l2cap_ctrl *control;
6840ed07 1946
3733937d
MM		 1947 BT_DBG("chan %p, skbs %p", chan, skbs);
1948
b99e13ad
MM		 1949 if (__chan_is_moving(chan))
1950 return;
1951
3733937d
MM		 1952 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1953
1954 while (!skb_queue_empty(&chan->tx_q)) {
1955
1956 skb = skb_dequeue(&chan->tx_q);
1957
1958 bt_cb(skb)->control.retries = 1;
1959 control = &bt_cb(skb)->control;
1960
1961 control->reqseq = 0;
1962 control->txseq = chan->next_tx_seq;
1963
1964 __pack_control(chan, control, skb);
6840ed07 1965
47d1ec61 1966 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1967 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1968 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1969 }
1970
4343478f 1971 l2cap_do_send(chan, skb);
6840ed07 1972
b4400672 1973 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1974
836be934 1975 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1976 chan->frames_sent++;
6840ed07 1977 }
6840ed07
GP		 1978}
1979
67c9e840 1980static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1981{
1982 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1983 struct l2cap_ctrl *control;
1984 int sent = 0;
1985
1986 BT_DBG("chan %p", chan);
1c2acffb 1987
89bc500e 1988 if (chan->state != BT_CONNECTED)
c13ffa62 1989 return -ENOTCONN;
e90bac06 1990
94122bbe
MM		 1991 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1992 return 0;
1993
b99e13ad
MM		 1994 if (__chan_is_moving(chan))
1995 return 0;
1996
18a48e76
MM		 1997 while (chan->tx_send_head &&
1998 chan->unacked_frames < chan->remote_tx_win &&
1999 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 2000
18a48e76 2001 skb = chan->tx_send_head;
e90bac06 2002
18a48e76
MM		 2003 bt_cb(skb)->control.retries = 1;
2004 control = &bt_cb(skb)->control;
95ffa978 2005
e2ab4353 2006 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 2007 control->final = 1;
e2ab4353 2008
18a48e76
MM		 2009 control->reqseq = chan->buffer_seq;
2010 chan->last_acked_seq = chan->buffer_seq;
2011 control->txseq = chan->next_tx_seq;
1c2acffb 2012
18a48e76 2013 __pack_control(chan, control, skb);
e90bac06 2014
47d1ec61 2015 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 2016 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
2017 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 2018 }
2019
18a48e76
MM		 2020 /* Clone after data has been modified. Data is assumed to be
2021 read-only (for locking purposes) on cloned sk_buffs.
2022 */
2023 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 2024
18a48e76
MM		 2025 if (!tx_skb)
2026 break;
1c2acffb 2027
18a48e76 2028 __set_retrans_timer(chan);
836be934
AE		 2029
2030 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 2031 chan->unacked_frames++;
6a026610 2032 chan->frames_sent++;
18a48e76 2033 sent++;
1c2acffb 2034
58d35f87
GP		 2035 if (skb_queue_is_last(&chan->tx_q, skb))
2036 chan->tx_send_head = NULL;
1c2acffb 2037 else
58d35f87 2038 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 2039
2040 l2cap_do_send(chan, tx_skb);
b4400672 2041 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 2042 }
2043
b4400672
AE		 2044 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
2045 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 2046
2047 return sent;
9e917af1
GP		 2048}
2049
e1fbd4c1
MM		 2050static void l2cap_ertm_resend(struct l2cap_chan *chan)
2051{
2052 struct l2cap_ctrl control;
2053 struct sk_buff *skb;
2054 struct sk_buff *tx_skb;
2055 u16 seq;
2056
2057 BT_DBG("chan %p", chan);
2058
2059 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2060 return;
2061
b99e13ad
MM		 2062 if (__chan_is_moving(chan))
2063 return;
2064
e1fbd4c1
MM		 2065 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
2066 seq = l2cap_seq_list_pop(&chan->retrans_list);
2067
2068 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
2069 if (!skb) {
2070 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 2071 seq);
e1fbd4c1
MM		 2072 continue;
2073 }
2074
2075 bt_cb(skb)->control.retries++;
2076 control = bt_cb(skb)->control;
2077
2078 if (chan->max_tx != 0 &&
2079 bt_cb(skb)->control.retries > chan->max_tx) {
2080 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 2081 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 2082 l2cap_seq_list_clear(&chan->retrans_list);
2083 break;
2084 }
2085
2086 control.reqseq = chan->buffer_seq;
2087 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2088 control.final = 1;
2089 else
2090 control.final = 0;
2091
2092 if (skb_cloned(skb)) {
2093 /* Cloned sk_buffs are read-only, so we need a
2094 * writeable copy
2095 */
8bcde1f2 2096 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 2097 } else {
8bcde1f2 2098 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 2099 }
2100
2101 if (!tx_skb) {
2102 l2cap_seq_list_clear(&chan->retrans_list);
2103 break;
2104 }
2105
2106 /* Update skb contents */
2107 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2108 put_unaligned_le32(__pack_extended_control(&control),
2109 tx_skb->data + L2CAP_HDR_SIZE);
2110 } else {
2111 put_unaligned_le16(__pack_enhanced_control(&control),
2112 tx_skb->data + L2CAP_HDR_SIZE);
2113 }
2114
2115 if (chan->fcs == L2CAP_FCS_CRC16) {
2116 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2117 put_unaligned_le16(fcs, skb_put(tx_skb,
2118 L2CAP_FCS_SIZE));
2119 }
2120
2121 l2cap_do_send(chan, tx_skb);
2122
2123 BT_DBG("Resent txseq %d", control.txseq);
2124
2125 chan->last_acked_seq = chan->buffer_seq;
2126 }
2127}
2128
f80842a8
MM		 2129static void l2cap_retransmit(struct l2cap_chan *chan,
2130 struct l2cap_ctrl *control)
2131{
2132 BT_DBG("chan %p, control %p", chan, control);
2133
2134 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2135 l2cap_ertm_resend(chan);
2136}
2137
d2a7ac5d
MM		 2138static void l2cap_retransmit_all(struct l2cap_chan *chan,
2139 struct l2cap_ctrl *control)
2140{
e1fbd4c1
MM		 2141 struct sk_buff *skb;
2142
2143 BT_DBG("chan %p, control %p", chan, control);
2144
2145 if (control->poll)
2146 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2147
2148 l2cap_seq_list_clear(&chan->retrans_list);
2149
2150 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2151 return;
2152
2153 if (chan->unacked_frames) {
2154 skb_queue_walk(&chan->tx_q, skb) {
2155 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2156 skb == chan->tx_send_head)
e1fbd4c1
MM		 2157 break;
2158 }
2159
2160 skb_queue_walk_from(&chan->tx_q, skb) {
2161 if (skb == chan->tx_send_head)
2162 break;
2163
2164 l2cap_seq_list_append(&chan->retrans_list,
2165 bt_cb(skb)->control.txseq);
2166 }
2167
2168 l2cap_ertm_resend(chan);
2169 }
d2a7ac5d
MM		 2170}
2171
0a0aba42 2172static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2173{
0a0aba42
MM		 2174 struct l2cap_ctrl control;
2175 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2176 chan->last_acked_seq);
2177 int threshold;
9e917af1 2178
0a0aba42
MM		 2179 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2180 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2181
0a0aba42
MM		 2182 memset(&control, 0, sizeof(control));
2183 control.sframe = 1;
dfc909be 2184
0a0aba42
MM		 2185 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2186 chan->rx_state == L2CAP_RX_STATE_RECV) {
2187 __clear_ack_timer(chan);
2188 control.super = L2CAP_SUPER_RNR;
2189 control.reqseq = chan->buffer_seq;
2190 l2cap_send_sframe(chan, &control);
2191 } else {
2192 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2193 l2cap_ertm_send(chan);
2194 /* If any i-frames were sent, they included an ack */
2195 if (chan->buffer_seq == chan->last_acked_seq)
2196 frames_to_ack = 0;
2197 }
dfc909be 2198
c20f8e35 2199 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2200 * Calculate without mul or div
2201 */
c20f8e35 2202 threshold = chan->ack_win;
0a0aba42
MM		 2203 threshold += threshold << 1;
2204 threshold >>= 2;
2205
b4400672 2206 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2207 threshold);
2208
2209 if (frames_to_ack >= threshold) {
2210 __clear_ack_timer(chan);
2211 control.super = L2CAP_SUPER_RR;
2212 control.reqseq = chan->buffer_seq;
2213 l2cap_send_sframe(chan, &control);
2214 frames_to_ack = 0;
2215 }
1c2acffb 2216
0a0aba42
MM		 2217 if (frames_to_ack)
2218 __set_ack_timer(chan);
2219 }
b17e73bb
SJ		 2220}
2221
04124681
GP		 2222static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2223 struct msghdr *msg, int len,
2224 int count, struct sk_buff *skb)
1c2acffb 2225{
0952a57a 2226 struct l2cap_conn *conn = chan->conn;
1c2acffb 2227 struct sk_buff **frag;
90338947 2228 int sent = 0;
1da177e4 2229
59203a21 2230 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2231 return -EFAULT;
1da177e4
LT		 2232
2233 sent += count;
2234 len -= count;
2235
2236 /* Continuation fragments (no L2CAP header) */
2237 frag = &skb_shinfo(skb)->frag_list;
2238 while (len) {
fbe00700
GP		 2239 struct sk_buff *tmp;
2240
1da177e4
LT		 2241 count = min_t(unsigned int, conn->mtu, len);
2242
fbe00700
GP		 2243 tmp = chan->ops->alloc_skb(chan, count,
2244 msg->msg_flags & MSG_DONTWAIT);
2245 if (IS_ERR(tmp))
2246 return PTR_ERR(tmp);
2247
2248 *frag = tmp;
2f7719ce 2249
1c2acffb
GP		 2250 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2251 return -EFAULT;
1da177e4 2252
5e59b791
LAD		 2253 (*frag)->priority = skb->priority;
2254
1da177e4
LT		 2255 sent += count;
2256 len -= count;
2257
2d0ed3d5
GP		 2258 skb->len += (*frag)->len;
2259 skb->data_len += (*frag)->len;
2260
1da177e4
LT		 2261 frag = &(*frag)->next;
2262 }
1da177e4
LT		 2263
2264 return sent;
1c2acffb 2265}
1da177e4 2266
5e59b791 2267static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2268 struct msghdr *msg, size_t len,
2269 u32 priority)
1c2acffb 2270{
8c1d787b 2271 struct l2cap_conn *conn = chan->conn;
1c2acffb 2272 struct sk_buff *skb;
03a51213 2273 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2274 struct l2cap_hdr *lh;
2275
43b1b8df
MH		 2276 BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan,
2277 __le16_to_cpu(chan->psm), len, priority);
1c2acffb
GP		 2278
2279 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2280
2281 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2282 msg->msg_flags & MSG_DONTWAIT);
2283 if (IS_ERR(skb))
2284 return skb;
1c2acffb 2285
5e59b791
LAD		 2286 skb->priority = priority;
2287
1c2acffb
GP		 2288 /* Create L2CAP header */
2289 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2290 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2291 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2292 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2293
0952a57a 2294 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2295 if (unlikely(err < 0)) {
2296 kfree_skb(skb);
2297 return ERR_PTR(err);
2298 }
2299 return skb;
2300}
2301
5e59b791 2302static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2303 struct msghdr *msg, size_t len,
2304 u32 priority)
1c2acffb 2305{
8c1d787b 2306 struct l2cap_conn *conn = chan->conn;
1c2acffb 2307 struct sk_buff *skb;
f2ba7fae 2308 int err, count;
1c2acffb
GP		 2309 struct l2cap_hdr *lh;
2310
b4400672 2311 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2312
f2ba7fae 2313 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2314
f2ba7fae 2315 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2316 msg->msg_flags & MSG_DONTWAIT);
2317 if (IS_ERR(skb))
2318 return skb;
1c2acffb 2319
5e59b791
LAD		 2320 skb->priority = priority;
2321
1c2acffb
GP		 2322 /* Create L2CAP header */
2323 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2324 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2325 lh->len = cpu_to_le16(len);
1c2acffb 2326
0952a57a 2327 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2328 if (unlikely(err < 0)) {
2329 kfree_skb(skb);
2330 return ERR_PTR(err);
2331 }
2332 return skb;
2333}
2334
ab0ff76d 2335static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2336 struct msghdr *msg, size_t len,
2337 u16 sdulen)
1c2acffb 2338{
8c1d787b 2339 struct l2cap_conn *conn = chan->conn;
1c2acffb 2340 struct sk_buff *skb;
e4ca6d98 2341 int err, count, hlen;
1c2acffb
GP		 2342 struct l2cap_hdr *lh;
2343
b4400672 2344 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2345
0ee0d208
GP		 2346 if (!conn)
2347 return ERR_PTR(-ENOTCONN);
2348
ba7aa64f 2349 hlen = __ertm_hdr_size(chan);
e4ca6d98 2350
c74e560c 2351 if (sdulen)
03a51213 2352 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2353
47d1ec61 2354 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2355 hlen += L2CAP_FCS_SIZE;
fcc203c3 2356
1c2acffb 2357 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2358
2359 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2360 msg->msg_flags & MSG_DONTWAIT);
2361 if (IS_ERR(skb))
2362 return skb;
1c2acffb
GP		 2363
2364 /* Create L2CAP header */
2365 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2366 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2367 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2368
18a48e76
MM		 2369 /* Control header is populated later */
2370 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2371 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2372 else
2373 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2374
c74e560c 2375 if (sdulen)
03a51213 2376 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2377
0952a57a 2378 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2379 if (unlikely(err < 0)) {
2380 kfree_skb(skb);
2381 return ERR_PTR(err);
2382 }
e90bac06 2383
18a48e76 2384 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2385 bt_cb(skb)->control.retries = 0;
1c2acffb 2386 return skb;
1da177e4
LT		 2387}
2388
94122bbe
MM		 2389static int l2cap_segment_sdu(struct l2cap_chan *chan,
2390 struct sk_buff_head *seg_queue,
2391 struct msghdr *msg, size_t len)
c74e560c 2392{
c74e560c 2393 struct sk_buff *skb;
94122bbe
MM		 2394 u16 sdu_len;
2395 size_t pdu_len;
94122bbe 2396 u8 sar;
c74e560c 2397
b4400672 2398 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2399
94122bbe
MM		 2400 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2401 * so fragmented skbs are not used. The HCI layer's handling
2402 * of fragmented skbs is not compatible with ERTM's queueing.
2403 */
c74e560c 2404
94122bbe
MM		 2405 /* PDU size is derived from the HCI MTU */
2406 pdu_len = chan->conn->mtu;
c74e560c 2407
a549574d
MM		 2408 /* Constrain PDU size for BR/EDR connections */
2409 if (!chan->hs_hcon)
2410 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2411
2412 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2413 if (chan->fcs)
2414 pdu_len -= L2CAP_FCS_SIZE;
2415
ba7aa64f 2416 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2417
2418 /* Remote device may have requested smaller PDUs */
2419 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2420
2421 if (len <= pdu_len) {
2422 sar = L2CAP_SAR_UNSEGMENTED;
2423 sdu_len = 0;
2424 pdu_len = len;
2425 } else {
2426 sar = L2CAP_SAR_START;
2427 sdu_len = len;
2428 pdu_len -= L2CAP_SDULEN_SIZE;
2429 }
2430
2431 while (len > 0) {
2432 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2433
c74e560c 2434 if (IS_ERR(skb)) {
94122bbe 2435 __skb_queue_purge(seg_queue);
c74e560c
GP		 2436 return PTR_ERR(skb);
2437 }
2438
94122bbe
MM		 2439 bt_cb(skb)->control.sar = sar;
2440 __skb_queue_tail(seg_queue, skb);
2441
2442 len -= pdu_len;
2443 if (sdu_len) {
2444 sdu_len = 0;
2445 pdu_len += L2CAP_SDULEN_SIZE;
2446 }
2447
2448 if (len <= pdu_len) {
2449 sar = L2CAP_SAR_END;
2450 pdu_len = len;
2451 } else {
2452 sar = L2CAP_SAR_CONTINUE;
2453 }
c74e560c 2454 }
c74e560c 2455
f0f62799 2456 return 0;
c74e560c
GP		 2457}
2458
5e59b791 2459int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2460 u32 priority)
9a91a04a 2461{
9a91a04a 2462 struct sk_buff *skb;
9a91a04a 2463 int err;
94122bbe 2464 struct sk_buff_head seg_queue;
9a91a04a
GP		 2465
2466 /* Connectionless channel */
715ec005 2467 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2468 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2469 if (IS_ERR(skb))
2470 return PTR_ERR(skb);
2471
2472 l2cap_do_send(chan, skb);
2473 return len;
2474 }
2475
2476 switch (chan->mode) {
2477 case L2CAP_MODE_BASIC:
2478 /* Check outgoing MTU */
2479 if (len > chan->omtu)
2480 return -EMSGSIZE;
2481
2482 /* Create a basic PDU */
5e59b791 2483 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2484 if (IS_ERR(skb))
2485 return PTR_ERR(skb);
2486
2487 l2cap_do_send(chan, skb);
2488 err = len;
2489 break;
2490
2491 case L2CAP_MODE_ERTM:
2492 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2493 /* Check outgoing MTU */
2494 if (len > chan->omtu) {
2495 err = -EMSGSIZE;
2496 break;
2497 }
9a91a04a 2498
94122bbe 2499 __skb_queue_head_init(&seg_queue);
9a91a04a 2500
94122bbe
MM		 2501 /* Do segmentation before calling in to the state machine,
2502 * since it's possible to block while waiting for memory
2503 * allocation.
2504 */
2505 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2506
94122bbe
MM		 2507 /* The channel could have been closed while segmenting,
2508 * check that it is still connected.
2509 */
2510 if (chan->state != BT_CONNECTED) {
2511 __skb_queue_purge(&seg_queue);
2512 err = -ENOTCONN;
9a91a04a
GP		 2513 }
2514
94122bbe 2515 if (err)
9a91a04a 2516 break;
9a91a04a 2517
3733937d 2518 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2519 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2520 else
d660366d 2521 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2522
d660366d 2523 err = len;
9a91a04a 2524
94122bbe
MM		 2525 /* If the skbs were not queued for sending, they'll still be in
2526 * seg_queue and need to be purged.
2527 */
2528 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2529 break;
2530
2531 default:
2532 BT_DBG("bad state %1.1x", chan->mode);
2533 err = -EBADFD;
2534 }
2535
2536 return err;
2537}
2538
d2a7ac5d
MM		 2539static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2540{
bed68bde
MM		 2541 struct l2cap_ctrl control;
2542 u16 seq;
2543
b4400672 2544 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2545
2546 memset(&control, 0, sizeof(control));
2547 control.sframe = 1;
2548 control.super = L2CAP_SUPER_SREJ;
2549
2550 for (seq = chan->expected_tx_seq; seq != txseq;
2551 seq = __next_seq(chan, seq)) {
2552 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2553 control.reqseq = seq;
2554 l2cap_send_sframe(chan, &control);
2555 l2cap_seq_list_append(&chan->srej_list, seq);
2556 }
2557 }
2558
2559 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2560}
2561
2562static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2563{
bed68bde
MM		 2564 struct l2cap_ctrl control;
2565
2566 BT_DBG("chan %p", chan);
2567
2568 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2569 return;
2570
2571 memset(&control, 0, sizeof(control));
2572 control.sframe = 1;
2573 control.super = L2CAP_SUPER_SREJ;
2574 control.reqseq = chan->srej_list.tail;
2575 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2576}
2577
2578static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2579{
bed68bde
MM		 2580 struct l2cap_ctrl control;
2581 u16 initial_head;
2582 u16 seq;
2583
b4400672 2584 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2585
2586 memset(&control, 0, sizeof(control));
2587 control.sframe = 1;
2588 control.super = L2CAP_SUPER_SREJ;
2589
2590 /* Capture initial list head to allow only one pass through the list. */
2591 initial_head = chan->srej_list.head;
2592
2593 do {
2594 seq = l2cap_seq_list_pop(&chan->srej_list);
2595 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2596 break;
2597
2598 control.reqseq = seq;
2599 l2cap_send_sframe(chan, &control);
2600 l2cap_seq_list_append(&chan->srej_list, seq);
2601 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2602}
2603
608bcc6d
MM		 2604static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2605{
2606 struct sk_buff *acked_skb;
2607 u16 ackseq;
2608
b4400672 2609 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2610
2611 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2612 return;
2613
b4400672 2614 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2615 chan->expected_ack_seq, chan->unacked_frames);
2616
2617 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2618 ackseq = __next_seq(chan, ackseq)) {
2619
2620 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2621 if (acked_skb) {
2622 skb_unlink(acked_skb, &chan->tx_q);
2623 kfree_skb(acked_skb);
2624 chan->unacked_frames--;
2625 }
2626 }
2627
2628 chan->expected_ack_seq = reqseq;
2629
2630 if (chan->unacked_frames == 0)
2631 __clear_retrans_timer(chan);
2632
b4400672 2633 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2634}
2635
2636static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2637{
2638 BT_DBG("chan %p", chan);
2639
2640 chan->expected_tx_seq = chan->buffer_seq;
2641 l2cap_seq_list_clear(&chan->srej_list);
2642 skb_queue_purge(&chan->srej_q);
2643 chan->rx_state = L2CAP_RX_STATE_RECV;
2644}
2645
d660366d
GP		 2646static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2647 struct l2cap_ctrl *control,
2648 struct sk_buff_head *skbs, u8 event)
608bcc6d 2649{
608bcc6d
MM		 2650 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2651 event);
2652
2653 switch (event) {
2654 case L2CAP_EV_DATA_REQUEST:
2655 if (chan->tx_send_head == NULL)
2656 chan->tx_send_head = skb_peek(skbs);
2657
2658 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2659 l2cap_ertm_send(chan);
2660 break;
2661 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2662 BT_DBG("Enter LOCAL_BUSY");
2663 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2664
2665 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2666 /* The SREJ_SENT state must be aborted if we are to
2667 * enter the LOCAL_BUSY state.
2668 */
2669 l2cap_abort_rx_srej_sent(chan);
2670 }
2671
2672 l2cap_send_ack(chan);
2673
2674 break;
2675 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2676 BT_DBG("Exit LOCAL_BUSY");
2677 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2678
2679 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2680 struct l2cap_ctrl local_control;
2681
2682 memset(&local_control, 0, sizeof(local_control));
2683 local_control.sframe = 1;
2684 local_control.super = L2CAP_SUPER_RR;
2685 local_control.poll = 1;
2686 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2687 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2688
2689 chan->retry_count = 1;
2690 __set_monitor_timer(chan);
2691 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2692 }
2693 break;
2694 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2695 l2cap_process_reqseq(chan, control->reqseq);
2696 break;
2697 case L2CAP_EV_EXPLICIT_POLL:
2698 l2cap_send_rr_or_rnr(chan, 1);
2699 chan->retry_count = 1;
2700 __set_monitor_timer(chan);
2701 __clear_ack_timer(chan);
2702 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2703 break;
2704 case L2CAP_EV_RETRANS_TO:
2705 l2cap_send_rr_or_rnr(chan, 1);
2706 chan->retry_count = 1;
2707 __set_monitor_timer(chan);
2708 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2709 break;
2710 case L2CAP_EV_RECV_FBIT:
2711 /* Nothing to process */
2712 break;
2713 default:
2714 break;
2715 }
608bcc6d
MM		 2716}
2717
d660366d
GP		 2718static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2719 struct l2cap_ctrl *control,
2720 struct sk_buff_head *skbs, u8 event)
608bcc6d 2721{
608bcc6d
MM		 2722 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2723 event);
2724
2725 switch (event) {
2726 case L2CAP_EV_DATA_REQUEST:
2727 if (chan->tx_send_head == NULL)
2728 chan->tx_send_head = skb_peek(skbs);
2729 /* Queue data, but don't send. */
2730 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2731 break;
2732 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2733 BT_DBG("Enter LOCAL_BUSY");
2734 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2735
2736 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2737 /* The SREJ_SENT state must be aborted if we are to
2738 * enter the LOCAL_BUSY state.
2739 */
2740 l2cap_abort_rx_srej_sent(chan);
2741 }
2742
2743 l2cap_send_ack(chan);
2744
2745 break;
2746 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2747 BT_DBG("Exit LOCAL_BUSY");
2748 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2749
2750 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2751 struct l2cap_ctrl local_control;
2752 memset(&local_control, 0, sizeof(local_control));
2753 local_control.sframe = 1;
2754 local_control.super = L2CAP_SUPER_RR;
2755 local_control.poll = 1;
2756 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2757 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2758
2759 chan->retry_count = 1;
2760 __set_monitor_timer(chan);
2761 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2762 }
2763 break;
2764 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2765 l2cap_process_reqseq(chan, control->reqseq);
2766
2767 /* Fall through */
2768
2769 case L2CAP_EV_RECV_FBIT:
2770 if (control && control->final) {
2771 __clear_monitor_timer(chan);
2772 if (chan->unacked_frames > 0)
2773 __set_retrans_timer(chan);
2774 chan->retry_count = 0;
2775 chan->tx_state = L2CAP_TX_STATE_XMIT;
2776 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2777 }
2778 break;
2779 case L2CAP_EV_EXPLICIT_POLL:
2780 /* Ignore */
2781 break;
2782 case L2CAP_EV_MONITOR_TO:
2783 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2784 l2cap_send_rr_or_rnr(chan, 1);
2785 __set_monitor_timer(chan);
2786 chan->retry_count++;
2787 } else {
5e4e3972 2788 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2789 }
2790 break;
2791 default:
2792 break;
2793 }
608bcc6d
MM		 2794}
2795
d660366d
GP		 2796static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2797 struct sk_buff_head *skbs, u8 event)
608bcc6d 2798{
608bcc6d
MM		 2799 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2800 chan, control, skbs, event, chan->tx_state);
2801
2802 switch (chan->tx_state) {
2803 case L2CAP_TX_STATE_XMIT:
d660366d 2804 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2805 break;
2806 case L2CAP_TX_STATE_WAIT_F:
d660366d 2807 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2808 break;
2809 default:
2810 /* Ignore event */
2811 break;
2812 }
608bcc6d
MM		 2813}
2814
4b51dae9
MM		 2815static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2816 struct l2cap_ctrl *control)
2817{
2818 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2819 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2820}
2821
f80842a8
MM		 2822static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2823 struct l2cap_ctrl *control)
2824{
2825 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2826 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2827}
2828
1da177e4
LT		 2829/* Copy frame to all raw sockets on that connection */
2830static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2831{
1da177e4 2832 struct sk_buff *nskb;
48454079 2833 struct l2cap_chan *chan;
1da177e4
LT		 2834
2835 BT_DBG("conn %p", conn);
2836
3df91ea2 2837 mutex_lock(&conn->chan_lock);
3d57dc68 2838
3df91ea2 2839 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2840 struct sock *sk = chan->sk;
715ec005 2841 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2842 continue;
2843
2844 /* Don't send frame to the socket it came from */
2845 if (skb->sk == sk)
2846 continue;
8bcde1f2 2847 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2848 if (!nskb)
1da177e4
LT		 2849 continue;
2850
80b98027 2851 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2852 kfree_skb(nskb);
2853 }
3d57dc68 2854
3df91ea2 2855 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2856}
2857
2858/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2859static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2860 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2861{
2862 struct sk_buff *skb, **frag;
2863 struct l2cap_cmd_hdr *cmd;
2864 struct l2cap_hdr *lh;
2865 int len, count;
2866
b4400672
AE		 2867 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2868 conn, code, ident, dlen);
1da177e4 2869
300b962e
AL		 2870 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2871 return NULL;
2872
1da177e4
LT		 2873 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2874 count = min_t(unsigned int, conn->mtu, len);
2875
8bcde1f2 2876 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2877 if (!skb)
2878 return NULL;
2879
2880 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2881 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2882
2883 if (conn->hcon->type == LE_LINK)
ac73498c 2884 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2885 else
ac73498c 2886 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2887
2888 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2889 cmd->code = code;
2890 cmd->ident = ident;
aca3192c 2891 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2892
2893 if (dlen) {
2894 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2895 memcpy(skb_put(skb, count), data, count);
2896 data += count;
2897 }
2898
2899 len -= skb->len;
2900
2901 /* Continuation fragments (no L2CAP header) */
2902 frag = &skb_shinfo(skb)->frag_list;
2903 while (len) {
2904 count = min_t(unsigned int, conn->mtu, len);
2905
8bcde1f2 2906 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2907 if (!*frag)
2908 goto fail;
2909
2910 memcpy(skb_put(*frag, count), data, count);
2911
2912 len -= count;
2913 data += count;
2914
2915 frag = &(*frag)->next;
2916 }
2917
2918 return skb;
2919
2920fail:
2921 kfree_skb(skb);
2922 return NULL;
2923}
2924
2d792818
GP		 2925static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2926 unsigned long *val)
1da177e4
LT		 2927{
2928 struct l2cap_conf_opt *opt = *ptr;
2929 int len;
2930
2931 len = L2CAP_CONF_OPT_SIZE + opt->len;
2932 *ptr += len;
2933
2934 *type = opt->type;
2935 *olen = opt->len;
2936
2937 switch (opt->len) {
2938 case 1:
2939 *val = *((u8 *) opt->val);
2940 break;
2941
2942 case 2:
bfaaeb3e 2943 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2944 break;
2945
2946 case 4:
bfaaeb3e 2947 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2948 break;
2949
2950 default:
2951 *val = (unsigned long) opt->val;
2952 break;
2953 }
2954
b4400672 2955 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2956 return len;
2957}
2958
1da177e4
LT		 2959static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2960{
2961 struct l2cap_conf_opt *opt = *ptr;
2962
b4400672 2963 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2964
2965 opt->type = type;
2966 opt->len = len;
2967
2968 switch (len) {
2969 case 1:
2970 *((u8 *) opt->val) = val;
2971 break;
2972
2973 case 2:
4f8b691c 2974 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2975 break;
2976
2977 case 4:
4f8b691c 2978 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2979 break;
2980
2981 default:
2982 memcpy(opt->val, (void *) val, len);
2983 break;
2984 }
2985
2986 *ptr += L2CAP_CONF_OPT_SIZE + len;
2987}
2988
f89cef09
AE		 2989static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2990{
2991 struct l2cap_conf_efs efs;
2992
1ec918ce 2993 switch (chan->mode) {
f89cef09
AE		 2994 case L2CAP_MODE_ERTM:
2995 efs.id = chan->local_id;
2996 efs.stype = chan->local_stype;
2997 efs.msdu = cpu_to_le16(chan->local_msdu);
2998 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 2999 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 3000 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3001 break;
3002
3003 case L2CAP_MODE_STREAMING:
3004 efs.id = 1;
3005 efs.stype = L2CAP_SERV_BESTEFFORT;
3006 efs.msdu = cpu_to_le16(chan->local_msdu);
3007 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3008 efs.acc_lat = 0;
3009 efs.flush_to = 0;
3010 break;
3011
3012 default:
3013 return;
3014 }
3015
3016 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3017 (unsigned long) &efs);
f89cef09
AE		 3018}
3019
721c4181 3020static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3021{
721c4181 3022 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3023 ack_timer.work);
3024 u16 frames_to_ack;
c1b4f43b 3025
2fb9b3d4
GP		 3026 BT_DBG("chan %p", chan);
3027
6be36555
AE		 3028 l2cap_chan_lock(chan);
3029
0362520b
MM		 3030 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3031 chan->last_acked_seq);
6be36555 3032
0362520b
MM		 3033 if (frames_to_ack)
3034 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3035
0362520b 3036 l2cap_chan_unlock(chan);
09bfb2ee 3037 l2cap_chan_put(chan);
c1b4f43b
GP		 3038}
3039
466f8004 3040int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3041{
3c588192
MM		 3042 int err;
3043
105bdf9e
MM		 3044 chan->next_tx_seq = 0;
3045 chan->expected_tx_seq = 0;
42e5c802 3046 chan->expected_ack_seq = 0;
6a026610 3047 chan->unacked_frames = 0;
42e5c802 3048 chan->buffer_seq = 0;
6a026610 3049 chan->frames_sent = 0;
105bdf9e
MM		 3050 chan->last_acked_seq = 0;
3051 chan->sdu = NULL;
3052 chan->sdu_last_frag = NULL;
3053 chan->sdu_len = 0;
3054
d34c34fb
MM		 3055 skb_queue_head_init(&chan->tx_q);
3056
6ed971ca
MH		 3057 chan->local_amp_id = AMP_ID_BREDR;
3058 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3059 chan->move_state = L2CAP_MOVE_STABLE;
3060 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3061
105bdf9e
MM		 3062 if (chan->mode != L2CAP_MODE_ERTM)
3063 return 0;
3064
3065 chan->rx_state = L2CAP_RX_STATE_RECV;
3066 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3067
721c4181
GP		 3068 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3069 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3070 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3071
f1c6775b 3072 skb_queue_head_init(&chan->srej_q);
1890d36b 3073
3c588192
MM		 3074 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3075 if (err < 0)
3076 return err;
3077
9dc9affc
MM		 3078 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3079 if (err < 0)
3080 l2cap_seq_list_free(&chan->srej_list);
3081
3082 return err;
0565c1c2
GP		 3083}
3084
f2fcfcd6
GP		 3085static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3086{
3087 switch (mode) {
3088 case L2CAP_MODE_STREAMING:
3089 case L2CAP_MODE_ERTM:
3090 if (l2cap_mode_supported(mode, remote_feat_mask))
3091 return mode;
3092 /* fall through */
3093 default:
3094 return L2CAP_MODE_BASIC;
3095 }
3096}
3097
848566b3 3098static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3099{
848566b3 3100 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
6327eb98
AE		 3101}
3102
848566b3 3103static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3104{
848566b3 3105 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
f89cef09
AE		 3106}
3107
36c86c85
MM		 3108static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3109 struct l2cap_conf_rfc *rfc)
3110{
6ed971ca 3111 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3112 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3113
3114 /* Class 1 devices have must have ERTM timeouts
3115 * exceeding the Link Supervision Timeout. The
3116 * default Link Supervision Timeout for AMP
3117 * controllers is 10 seconds.
3118 *
3119 * Class 1 devices use 0xffffffff for their
3120 * best-effort flush timeout, so the clamping logic
3121 * will result in a timeout that meets the above
3122 * requirement. ERTM timeouts are 16-bit values, so
3123 * the maximum timeout is 65.535 seconds.
3124 */
3125
3126 /* Convert timeout to milliseconds and round */
3127 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3128
3129 /* This is the recommended formula for class 2 devices
3130 * that start ERTM timers when packets are sent to the
3131 * controller.
3132 */
3133 ertm_to = 3 * ertm_to + 500;
3134
3135 if (ertm_to > 0xffff)
3136 ertm_to = 0xffff;
3137
3138 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3139 rfc->monitor_timeout = rfc->retrans_timeout;
3140 } else {
3141 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3142 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3143 }
3144}
3145
6327eb98
AE		 3146static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3147{
3148 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3149 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3150 /* use extended control field */
3151 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3152 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3153 } else {
6327eb98 3154 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3155 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3156 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3157 }
c20f8e35 3158 chan->ack_win = chan->tx_win;
6327eb98
AE		 3159}
3160
710f9b0a 3161static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3162{
1da177e4 3163 struct l2cap_conf_req *req = data;
0c1bc5c6 3164 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3165 void *ptr = req->data;
c8f79162 3166 u16 size;
1da177e4 3167
49208c9c 3168 BT_DBG("chan %p", chan);
1da177e4 3169
73ffa904 3170 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3171 goto done;
3172
0c1bc5c6 3173 switch (chan->mode) {
f2fcfcd6
GP		 3174 case L2CAP_MODE_STREAMING:
3175 case L2CAP_MODE_ERTM:
c1360a1c 3176 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3177 break;
85eb53c6 3178
848566b3 3179 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3180 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3181
2ba13ed6 3182 /* fall through */
f2fcfcd6 3183 default:
8c1d787b 3184 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3185 break;
3186 }
3187
3188done:
0c1bc5c6
GP		 3189 if (chan->imtu != L2CAP_DEFAULT_MTU)
3190 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3191
0c1bc5c6 3192 switch (chan->mode) {
65c7c491 3193 case L2CAP_MODE_BASIC:
8c1d787b 3194 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3195 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3196 break;
3197
62547752
GP		 3198 rfc.mode = L2CAP_MODE_BASIC;
3199 rfc.txwin_size = 0;
3200 rfc.max_transmit = 0;
3201 rfc.retrans_timeout = 0;
3202 rfc.monitor_timeout = 0;
3203 rfc.max_pdu_size = 0;
3204
63406504 3205 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3206 (unsigned long) &rfc);
65c7c491
MH		 3207 break;
3208
3209 case L2CAP_MODE_ERTM:
3210 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3211 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3212
3213 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3214
3215 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3216 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3217 L2CAP_FCS_SIZE);
c8f79162 3218 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3219
6327eb98
AE		 3220 l2cap_txwin_setup(chan);
3221
3222 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3223 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3224
63406504 3225 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3226 (unsigned long) &rfc);
63406504 3227
f89cef09
AE		 3228 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3229 l2cap_add_opt_efs(&ptr, chan);
3230
6327eb98
AE		 3231 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3232 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3233 chan->tx_win);
60918918
AE		 3234
3235 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3236 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3237 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3238 chan->fcs = L2CAP_FCS_NONE;
3239 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3240 chan->fcs);
3241 }
f2fcfcd6
GP		 3242 break;
3243
3244 case L2CAP_MODE_STREAMING:
273759e2 3245 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3246 rfc.mode = L2CAP_MODE_STREAMING;
3247 rfc.txwin_size = 0;
3248 rfc.max_transmit = 0;
3249 rfc.retrans_timeout = 0;
3250 rfc.monitor_timeout = 0;
c8f79162
AE		 3251
3252 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3253 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3254 L2CAP_FCS_SIZE);
c8f79162 3255 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3256
63406504 3257 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3258 (unsigned long) &rfc);
63406504 3259
f89cef09
AE		 3260 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3261 l2cap_add_opt_efs(&ptr, chan);
3262
60918918
AE		 3263 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3264 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3265 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3266 chan->fcs = L2CAP_FCS_NONE;
3267 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3268 chan->fcs);
3269 }
65c7c491
MH		 3270 break;
3271 }
1da177e4 3272
fe4128e0 3273 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3274 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3275
3276 return ptr - data;
3277}
3278
73ffa904 3279static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3280{
5dee9e7c
MH		 3281 struct l2cap_conf_rsp *rsp = data;
3282 void *ptr = rsp->data;
73ffa904
GP		 3283 void *req = chan->conf_req;
3284 int len = chan->conf_len;
5dee9e7c
MH		 3285 int type, hint, olen;
3286 unsigned long val;
6464f35f 3287 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3288 struct l2cap_conf_efs efs;
3289 u8 remote_efs = 0;
861d6882 3290 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3291 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3292 u16 size;
1da177e4 3293
73ffa904 3294 BT_DBG("chan %p", chan);
820ae1b8 3295
5dee9e7c
MH		 3296 while (len >= L2CAP_CONF_OPT_SIZE) {
3297 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3298
589d2746 3299 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3300 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3301
3302 switch (type) {
3303 case L2CAP_CONF_MTU:
861d6882 3304 mtu = val;
5dee9e7c
MH		 3305 break;
3306
3307 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3308 chan->flush_to = val;
5dee9e7c
MH		 3309 break;
3310
3311 case L2CAP_CONF_QOS:
3312 break;
3313
6464f35f
MH		 3314 case L2CAP_CONF_RFC:
3315 if (olen == sizeof(rfc))
3316 memcpy(&rfc, (void *) val, olen);
3317 break;
3318
fcc203c3
GP		 3319 case L2CAP_CONF_FCS:
3320 if (val == L2CAP_FCS_NONE)
f2592d3e 3321 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3322 break;
fcc203c3 3323
42dceae2
AE		 3324 case L2CAP_CONF_EFS:
3325 remote_efs = 1;
3326 if (olen == sizeof(efs))
3327 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3328 break;
3329
6327eb98 3330 case L2CAP_CONF_EWS:
848566b3 3331 if (!chan->conn->hs_enabled)
6327eb98 3332 return -ECONNREFUSED;
fcc203c3 3333
6327eb98
AE		 3334 set_bit(FLAG_EXT_CTRL, &chan->flags);
3335 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3336 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3337 chan->remote_tx_win = val;
fcc203c3
GP		 3338 break;
3339
5dee9e7c
MH		 3340 default:
3341 if (hint)
3342 break;
3343
3344 result = L2CAP_CONF_UNKNOWN;
3345 *((u8 *) ptr++) = type;
3346 break;
3347 }
3348 }
3349
73ffa904 3350 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3351 goto done;
3352
0c1bc5c6 3353 switch (chan->mode) {
f2fcfcd6
GP		 3354 case L2CAP_MODE_STREAMING:
3355 case L2CAP_MODE_ERTM:
c1360a1c 3356 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3357 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3358 chan->conn->feat_mask);
85eb53c6
GP		 3359 break;
3360 }
3361
42dceae2 3362 if (remote_efs) {
848566b3 3363 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3364 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3365 else
3366 return -ECONNREFUSED;
3367 }
3368
0c1bc5c6 3369 if (chan->mode != rfc.mode)
f2fcfcd6 3370 return -ECONNREFUSED;
742e519b 3371
f2fcfcd6 3372 break;
f2fcfcd6
GP		 3373 }
3374
3375done:
0c1bc5c6 3376 if (chan->mode != rfc.mode) {
f2fcfcd6 3377 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3378 rfc.mode = chan->mode;
f2fcfcd6 3379
73ffa904 3380 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3381 return -ECONNREFUSED;
3382
2d792818
GP		 3383 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3384 (unsigned long) &rfc);
f2fcfcd6
GP		 3385 }
3386
5dee9e7c
MH		 3387 if (result == L2CAP_CONF_SUCCESS) {
3388 /* Configure output options and let the other side know
3389 * which ones we don't like. */
3390
f2fcfcd6
GP		 3391 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3392 result = L2CAP_CONF_UNACCEPT;
3393 else {
0c1bc5c6 3394 chan->omtu = mtu;
c1360a1c 3395 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3396 }
0c1bc5c6 3397 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3398
42dceae2
AE		 3399 if (remote_efs) {
3400 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3401 efs.stype != L2CAP_SERV_NOTRAFIC &&
3402 efs.stype != chan->local_stype) {
42dceae2
AE		 3403
3404 result = L2CAP_CONF_UNACCEPT;
3405
3406 if (chan->num_conf_req >= 1)
3407 return -ECONNREFUSED;
3408
3409 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3410 sizeof(efs),
3411 (unsigned long) &efs);
0e8b207e 3412 } else {
3e6b3b95 3413 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3414 result = L2CAP_CONF_PENDING;
3415 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3416 }
3417 }
3418
f2fcfcd6
GP		 3419 switch (rfc.mode) {
3420 case L2CAP_MODE_BASIC:
47d1ec61 3421 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3422 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3423 break;
3424
3425 case L2CAP_MODE_ERTM:
6327eb98
AE		 3426 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3427 chan->remote_tx_win = rfc.txwin_size;
3428 else
3429 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3430
2c03a7a4 3431 chan->remote_max_tx = rfc.max_transmit;
1c762159 3432
c8f79162 3433 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3434 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3435 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3436 rfc.max_pdu_size = cpu_to_le16(size);
3437 chan->remote_mps = size;
f2fcfcd6 3438
36c86c85 3439 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3440
c1360a1c 3441 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3442
3443 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3444 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3445
42dceae2
AE		 3446 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3447 chan->remote_id = efs.id;
3448 chan->remote_stype = efs.stype;
3449 chan->remote_msdu = le16_to_cpu(efs.msdu);
3450 chan->remote_flush_to =
2d792818 3451 le32_to_cpu(efs.flush_to);
42dceae2 3452 chan->remote_acc_lat =
2d792818 3453 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3454 chan->remote_sdu_itime =
3455 le32_to_cpu(efs.sdu_itime);
3456 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3457 sizeof(efs),
3458 (unsigned long) &efs);
42dceae2 3459 }
f2fcfcd6
GP		 3460 break;
3461
3462 case L2CAP_MODE_STREAMING:
c8f79162 3463 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3464 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3465 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3466 rfc.max_pdu_size = cpu_to_le16(size);
3467 chan->remote_mps = size;
f2fcfcd6 3468
c1360a1c 3469 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3470
2d792818
GP		 3471 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3472 (unsigned long) &rfc);
68ae6639 3473
f2fcfcd6
GP		 3474 break;
3475
3476 default:
5dee9e7c 3477 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3478
6464f35f 3479 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3480 rfc.mode = chan->mode;
f2fcfcd6 3481 }
6464f35f 3482
f2fcfcd6 3483 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3484 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3485 }
fe4128e0 3486 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3487 rsp->result = cpu_to_le16(result);
59e54bd1 3488 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3489
3490 return ptr - data;
1da177e4
LT		 3491}
3492
2d792818
GP		 3493static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3494 void *data, u16 *result)
f2fcfcd6 3495{
f2fcfcd6
GP		 3496 struct l2cap_conf_req *req = data;
3497 void *ptr = req->data;
3498 int type, olen;
3499 unsigned long val;
36e999a8 3500 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3501 struct l2cap_conf_efs efs;
f2fcfcd6 3502
fe4128e0 3503 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3504
3505 while (len >= L2CAP_CONF_OPT_SIZE) {
3506 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3507
3508 switch (type) {
3509 case L2CAP_CONF_MTU:
3510 if (val < L2CAP_DEFAULT_MIN_MTU) {
3511 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3512 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3513 } else
0c1bc5c6
GP		 3514 chan->imtu = val;
3515 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3516 break;
3517
3518 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3519 chan->flush_to = val;
f2fcfcd6 3520 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3521 2, chan->flush_to);
f2fcfcd6
GP		 3522 break;
3523
3524 case L2CAP_CONF_RFC:
3525 if (olen == sizeof(rfc))
3526 memcpy(&rfc, (void *)val, olen);
3527
c1360a1c 3528 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3529 rfc.mode != chan->mode)
f2fcfcd6
GP		 3530 return -ECONNREFUSED;
3531
47d1ec61 3532 chan->fcs = 0;
f2fcfcd6
GP		 3533
3534 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3535 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3536 break;
6327eb98
AE		 3537
3538 case L2CAP_CONF_EWS:
c20f8e35 3539 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3540 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3541 chan->tx_win);
6327eb98 3542 break;
66af7aaf
AE		 3543
3544 case L2CAP_CONF_EFS:
3545 if (olen == sizeof(efs))
3546 memcpy(&efs, (void *)val, olen);
3547
3548 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3549 efs.stype != L2CAP_SERV_NOTRAFIC &&
3550 efs.stype != chan->local_stype)
66af7aaf
AE		 3551 return -ECONNREFUSED;
3552
2d792818
GP		 3553 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3554 (unsigned long) &efs);
66af7aaf 3555 break;
cbabee78
AE		 3556
3557 case L2CAP_CONF_FCS:
3558 if (*result == L2CAP_CONF_PENDING)
3559 if (val == L2CAP_FCS_NONE)
f2592d3e 3560 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3561 &chan->conf_state);
3562 break;
f2fcfcd6
GP		 3563 }
3564 }
3565
0c1bc5c6 3566 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3567 return -ECONNREFUSED;
3568
0c1bc5c6 3569 chan->mode = rfc.mode;
6c2ea7a8 3570
0e8b207e 3571 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3572 switch (rfc.mode) {
3573 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3574 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3575 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3576 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3577 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3578 chan->ack_win = min_t(u16, chan->ack_win,
3579 rfc.txwin_size);
66af7aaf
AE		 3580
3581 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3582 chan->local_msdu = le16_to_cpu(efs.msdu);
3583 chan->local_sdu_itime =
2d792818 3584 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3585 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3586 chan->local_flush_to =
2d792818 3587 le32_to_cpu(efs.flush_to);
66af7aaf 3588 }
f2fcfcd6 3589 break;
66af7aaf 3590
f2fcfcd6 3591 case L2CAP_MODE_STREAMING:
47d1ec61 3592 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3593 }
3594 }
3595
fe4128e0 3596 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3597 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3598
3599 return ptr - data;
3600}
3601
2d792818
GP		 3602static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3603 u16 result, u16 flags)
1da177e4
LT		 3604{
3605 struct l2cap_conf_rsp *rsp = data;
3606 void *ptr = rsp->data;
1da177e4 3607
fe4128e0 3608 BT_DBG("chan %p", chan);
1da177e4 3609
fe4128e0 3610 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3611 rsp->result = cpu_to_le16(result);
aca3192c 3612 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3613
3614 return ptr - data;
3615}
3616
8c1d787b 3617void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3618{
3619 struct l2cap_conn_rsp rsp;
8c1d787b 3620 struct l2cap_conn *conn = chan->conn;
710f9b0a 3621 u8 buf[128];
439f34ac 3622 u8 rsp_code;
710f9b0a 3623
fe4128e0
GP		 3624 rsp.scid = cpu_to_le16(chan->dcid);
3625 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3626 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3627 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3628
3629 if (chan->hs_hcon)
3630 rsp_code = L2CAP_CREATE_CHAN_RSP;
3631 else
3632 rsp_code = L2CAP_CONN_RSP;
3633
3634 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3635
3636 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3637
c1360a1c 3638 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3639 return;
3640
710f9b0a 3641 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3642 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3643 chan->num_conf_req++;
3644}
3645
47d1ec61 3646static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3647{
7b1c0049
GP		 3648 int type, olen;
3649 unsigned long val;
c20f8e35
MM		 3650 /* Use sane default values in case a misbehaving remote device
3651 * did not send an RFC or extended window size option.
3652 */
3653 u16 txwin_ext = chan->ack_win;
3654 struct l2cap_conf_rfc rfc = {
3655 .mode = chan->mode,
3656 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3657 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3658 .max_pdu_size = cpu_to_le16(chan->imtu),
3659 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3660 };
7b1c0049 3661
47d1ec61 3662 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3663
0c1bc5c6 3664 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3665 return;
3666
3667 while (len >= L2CAP_CONF_OPT_SIZE) {
3668 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3669
c20f8e35
MM		 3670 switch (type) {
3671 case L2CAP_CONF_RFC:
3672 if (olen == sizeof(rfc))
3673 memcpy(&rfc, (void *)val, olen);
8f321f85 3674 break;
c20f8e35
MM		 3675 case L2CAP_CONF_EWS:
3676 txwin_ext = val;
3677 break;
3678 }
7b1c0049
GP		 3679 }
3680
7b1c0049
GP		 3681 switch (rfc.mode) {
3682 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3683 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3684 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3685 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3686 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3687 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3688 else
3689 chan->ack_win = min_t(u16, chan->ack_win,
3690 rfc.txwin_size);
7b1c0049
GP		 3691 break;
3692 case L2CAP_MODE_STREAMING:
47d1ec61 3693 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3694 }
3695}
3696
2d792818 3697static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3698 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3699 u8 *data)
4e8402a3 3700{
e2fd318e 3701 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3702
cb3b3152
JH		 3703 if (cmd_len < sizeof(*rej))
3704 return -EPROTO;
3705
e2fd318e 3706 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3707 return 0;
3708
3709 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3710 cmd->ident == conn->info_ident) {
17cd3f37 3711 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3712
3713 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3714 conn->info_ident = 0;
984947dc 3715
4e8402a3
MH		 3716 l2cap_conn_start(conn);
3717 }
3718
3719 return 0;
3720}
3721
1700915f
MM		 3722static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3723 struct l2cap_cmd_hdr *cmd,
3724 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3725{
1da177e4
LT		 3726 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3727 struct l2cap_conn_rsp rsp;
23691d75 3728 struct l2cap_chan *chan = NULL, *pchan;
d42970f3 3729 struct sock *parent;
e7c29cb1 3730 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3731
3732 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3733 __le16 psm = req->psm;
1da177e4 3734
097db76c 3735 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3736
3737 /* Check if we have socket listening on psm */
6f59b904 3738 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
98e0f7ea 3739 &conn->hcon->dst);
23691d75 3740 if (!pchan) {
1da177e4
LT		 3741 result = L2CAP_CR_BAD_PSM;
3742 goto sendresp;
3743 }
3744
23691d75
GP		 3745 parent = pchan->sk;
3746
3df91ea2 3747 mutex_lock(&conn->chan_lock);
aa2ac881 3748 lock_sock(parent);
e0f0cb56 3749
e7c29cb1 3750 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3751 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3752 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3753 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3754 result = L2CAP_CR_SEC_BLOCK;
3755 goto response;
3756 }
3757
1da177e4
LT		 3758 result = L2CAP_CR_NO_MEM;
3759
2dfa1003
GP		 3760 /* Check if we already have channel with that dcid */
3761 if (__l2cap_get_chan_by_dcid(conn, scid))
3762 goto response;
3763
80b98027 3764 chan = pchan->ops->new_connection(pchan);
80808e43 3765 if (!chan)
1da177e4
LT		 3766 goto response;
3767
330b6c15
SS		 3768 /* For certain devices (ex: HID mouse), support for authentication,
3769 * pairing and bonding is optional. For such devices, inorder to avoid
3770 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3771 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3772 */
3773 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3774
7eafc59e
MH		 3775 bacpy(&chan->src, &conn->hcon->src);
3776 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 3777 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3778 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
fe4128e0
GP		 3779 chan->psm = psm;
3780 chan->dcid = scid;
1700915f 3781 chan->local_amp_id = amp_id;
1da177e4 3782
6be36555 3783 __l2cap_chan_add(conn, chan);
48454079 3784
fe4128e0 3785 dcid = chan->scid;
1da177e4 3786
8d836d71 3787 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3788
fc7f8a7e 3789 chan->ident = cmd->ident;
1da177e4 3790
984947dc 3791 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3792 if (l2cap_chan_check_security(chan)) {
bdc25783 3793 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
0e587be7 3794 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3795 result = L2CAP_CR_PEND;
3796 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3797 chan->ops->defer(chan);
f66dc81f 3798 } else {
1700915f
MM		 3799 /* Force pending result for AMP controllers.
3800 * The connection will succeed after the
3801 * physical link is up.
3802 */
6ed971ca 3803 if (amp_id == AMP_ID_BREDR) {
1700915f
MM		 3804 __l2cap_state_change(chan, BT_CONFIG);
3805 result = L2CAP_CR_SUCCESS;
6ed971ca
MH		 3806 } else {
3807 __l2cap_state_change(chan, BT_CONNECT2);
3808 result = L2CAP_CR_PEND;
1700915f 3809 }
f66dc81f
MH		 3810 status = L2CAP_CS_NO_INFO;
3811 }
79d554a6 3812 } else {
0e587be7 3813 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3814 result = L2CAP_CR_PEND;
3815 status = L2CAP_CS_AUTHEN_PEND;
3816 }
3817 } else {
0e587be7 3818 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3819 result = L2CAP_CR_PEND;
3820 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3821 }
3822
1da177e4 3823response:
aa2ac881 3824 release_sock(parent);
3df91ea2 3825 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3826
3827sendresp:
aca3192c
YH		 3828 rsp.scid = cpu_to_le16(scid);
3829 rsp.dcid = cpu_to_le16(dcid);
3830 rsp.result = cpu_to_le16(result);
3831 rsp.status = cpu_to_le16(status);
4c89b6aa 3832 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3833
3834 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3835 struct l2cap_info_req info;
ac73498c 3836 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3837
3838 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3839 conn->info_ident = l2cap_get_ident(conn);
3840
ba13ccd9 3841 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3842
2d792818
GP		 3843 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3844 sizeof(info), &info);
79d554a6
MH		 3845 }
3846
c1360a1c 3847 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3848 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3849 u8 buf[128];
c1360a1c 3850 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3851 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3852 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3853 chan->num_conf_req++;
e9aeb2dd 3854 }
1700915f
MM		 3855
3856 return chan;
4c89b6aa 3857}
e9aeb2dd 3858
4c89b6aa 3859static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3860 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3861{
7b064eda
JK		 3862 struct hci_dev *hdev = conn->hcon->hdev;
3863 struct hci_conn *hcon = conn->hcon;
3864
cb3b3152
JH		 3865 if (cmd_len < sizeof(struct l2cap_conn_req))
3866 return -EPROTO;
3867
7b064eda
JK		 3868 hci_dev_lock(hdev);
3869 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3870 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3871 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3872 hcon->dst_type, 0, NULL, 0,
3873 hcon->dev_class);
3874 hci_dev_unlock(hdev);
3875
300229f9 3876 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3877 return 0;
3878}
3879
5909cf30 3880static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3881 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3882 u8 *data)
1da177e4
LT		 3883{
3884 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3885 u16 scid, dcid, result, status;
48454079 3886 struct l2cap_chan *chan;
1da177e4 3887 u8 req[128];
3df91ea2 3888 int err;
1da177e4 3889
cb3b3152
JH		 3890 if (cmd_len < sizeof(*rsp))
3891 return -EPROTO;
3892
1da177e4
LT		 3893 scid = __le16_to_cpu(rsp->scid);
3894 dcid = __le16_to_cpu(rsp->dcid);
3895 result = __le16_to_cpu(rsp->result);
3896 status = __le16_to_cpu(rsp->status);
3897
1b009c98 3898 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3899 dcid, scid, result, status);
1da177e4 3900
3df91ea2
AE		 3901 mutex_lock(&conn->chan_lock);
3902
1da177e4 3903 if (scid) {
3df91ea2
AE		 3904 chan = __l2cap_get_chan_by_scid(conn, scid);
3905 if (!chan) {
21870b52 3906 err = -EBADSLT;
3df91ea2
AE		 3907 goto unlock;
3908 }
1da177e4 3909 } else {
3df91ea2
AE		 3910 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3911 if (!chan) {
21870b52 3912 err = -EBADSLT;
3df91ea2
AE		 3913 goto unlock;
3914 }
1da177e4
LT		 3915 }
3916
3df91ea2
AE		 3917 err = 0;
3918
6be36555 3919 l2cap_chan_lock(chan);
48454079 3920
1da177e4
LT		 3921 switch (result) {
3922 case L2CAP_CR_SUCCESS:
89bc500e 3923 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3924 chan->ident = 0;
fe4128e0 3925 chan->dcid = dcid;
c1360a1c 3926 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3927
c1360a1c 3928 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3929 break;
3930
1da177e4 3931 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3932 l2cap_build_conf_req(chan, req), req);
73ffa904 3933 chan->num_conf_req++;
1da177e4
LT		 3934 break;
3935
3936 case L2CAP_CR_PEND:
c1360a1c 3937 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3938 break;
3939
3940 default:
48454079 3941 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3942 break;
3943 }
3944
6be36555 3945 l2cap_chan_unlock(chan);
3df91ea2
AE		 3946
3947unlock:
3948 mutex_unlock(&conn->chan_lock);
3949
3950 return err;
1da177e4
LT		 3951}
3952
47d1ec61 3953static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3954{
3955 /* FCS is enabled only in ERTM or streaming mode, if one or both
3956 * sides request it.
3957 */
0c1bc5c6 3958 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3959 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3960 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3961 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3962}
3963
29d8a590
AE		 3964static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3965 u8 ident, u16 flags)
3966{
3967 struct l2cap_conn *conn = chan->conn;
3968
3969 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3970 flags);
3971
3972 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3973 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3974
3975 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3976 l2cap_build_conf_rsp(chan, data,
3977 L2CAP_CONF_SUCCESS, flags), data);
3978}
3979
662d652d
JH		 3980static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
3981 u16 scid, u16 dcid)
3982{
3983 struct l2cap_cmd_rej_cid rej;
3984
3985 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
3986 rej.scid = __cpu_to_le16(scid);
3987 rej.dcid = __cpu_to_le16(dcid);
3988
3989 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3990}
3991
2d792818
GP		 3992static inline int l2cap_config_req(struct l2cap_conn *conn,
3993 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3994 u8 *data)
1da177e4
LT		 3995{
3996 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3997 u16 dcid, flags;
3998 u8 rsp[64];
48454079 3999 struct l2cap_chan *chan;
3c588192 4000 int len, err = 0;
1da177e4 4001
cb3b3152
JH		 4002 if (cmd_len < sizeof(*req))
4003 return -EPROTO;
4004
1da177e4
LT		 4005 dcid = __le16_to_cpu(req->dcid);
4006 flags = __le16_to_cpu(req->flags);
4007
4008 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4009
baa7e1fa 4010 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4011 if (!chan) {
4012 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4013 return 0;
4014 }
1da177e4 4015
033b1142 4016 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4017 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4018 chan->dcid);
354f60a9 4019 goto unlock;
df6bd743 4020 }
354f60a9 4021
5dee9e7c 4022 /* Reject if config buffer is too small. */
88219a0f 4023 len = cmd_len - sizeof(*req);
cb3b3152 4024 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4025 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4026 l2cap_build_conf_rsp(chan, rsp,
4027 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4028 goto unlock;
4029 }
4030
4031 /* Store config. */
73ffa904
GP		 4032 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4033 chan->conf_len += len;
1da177e4 4034
59e54bd1 4035 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4036 /* Incomplete config. Send empty response. */
4037 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4038 l2cap_build_conf_rsp(chan, rsp,
4039 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4040 goto unlock;
4041 }
4042
4043 /* Complete config. */
73ffa904 4044 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4045 if (len < 0) {
5e4e3972 4046 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4047 goto unlock;
f2fcfcd6 4048 }
1da177e4 4049
1500109b 4050 chan->ident = cmd->ident;
5dee9e7c 4051 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4052 chan->num_conf_rsp++;
5dee9e7c 4053
5dee9e7c 4054 /* Reset config buffer. */
73ffa904 4055 chan->conf_len = 0;
5dee9e7c 4056
c1360a1c 4057 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4058 goto unlock;
4059
c1360a1c 4060 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4061 set_default_fcs(chan);
fcc203c3 4062
105bdf9e
MM		 4063 if (chan->mode == L2CAP_MODE_ERTM ||
4064 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4065 err = l2cap_ertm_init(chan);
4066
4067 if (err < 0)
5e4e3972 4068 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4069 else
4070 l2cap_chan_ready(chan);
0565c1c2 4071
876d9484
MH		 4072 goto unlock;
4073 }
4074
c1360a1c 4075 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4076 u8 buf[64];
1da177e4 4077 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4078 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4079 chan->num_conf_req++;
1da177e4
LT		 4080 }
4081
0e8b207e
AE		 4082 /* Got Conf Rsp PENDING from remote side and asume we sent
4083 Conf Rsp PENDING in the code above */
4084 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4085 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4086
4087 /* check compatibility */
4088
79de886d 4089 /* Send rsp for BR/EDR channel */
f351bc72 4090 if (!chan->hs_hcon)
79de886d
AE		 4091 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4092 else
4093 chan->ident = cmd->ident;
0e8b207e
AE		 4094 }
4095
1da177e4 4096unlock:
6be36555 4097 l2cap_chan_unlock(chan);
3c588192 4098 return err;
1da177e4
LT		 4099}
4100
2d792818 4101static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4102 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4103 u8 *data)
1da177e4
LT		 4104{
4105 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4106 u16 scid, flags, result;
48454079 4107 struct l2cap_chan *chan;
cb3b3152 4108 int len = cmd_len - sizeof(*rsp);
3c588192 4109 int err = 0;
1da177e4 4110
cb3b3152
JH		 4111 if (cmd_len < sizeof(*rsp))
4112 return -EPROTO;
4113
1da177e4
LT		 4114 scid = __le16_to_cpu(rsp->scid);
4115 flags = __le16_to_cpu(rsp->flags);
4116 result = __le16_to_cpu(rsp->result);
4117
61386cba
AE		 4118 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4119 result, len);
1da177e4 4120
baa7e1fa 4121 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4122 if (!chan)
1da177e4
LT		 4123 return 0;
4124
4125 switch (result) {
4126 case L2CAP_CONF_SUCCESS:
47d1ec61 4127 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4128 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4129 break;
4130
0e8b207e
AE		 4131 case L2CAP_CONF_PENDING:
4132 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4133
4134 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4135 char buf[64];
4136
4137 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4138 buf, &result);
0e8b207e 4139 if (len < 0) {
5e4e3972 4140 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4141 goto done;
4142 }
4143
f351bc72 4144 if (!chan->hs_hcon) {
79de886d
AE		 4145 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4146 0);
5ce66b59
AE		 4147 } else {
4148 if (l2cap_check_efs(chan)) {
4149 amp_create_logical_link(chan);
4150 chan->ident = cmd->ident;
4151 }
4152 }
0e8b207e
AE		 4153 }
4154 goto done;
4155
1da177e4 4156 case L2CAP_CONF_UNACCEPT:
73ffa904 4157 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4158 char req[64];
4159
c2c77ec8 4160 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4161 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4162 goto done;
4163 }
4164
f2fcfcd6
GP		 4165 /* throw out any old stored conf requests */
4166 result = L2CAP_CONF_SUCCESS;
b4450035 4167 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4168 req, &result);
f2fcfcd6 4169 if (len < 0) {
5e4e3972 4170 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4171 goto done;
4172 }
4173
4174 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4175 L2CAP_CONF_REQ, len, req);
73ffa904 4176 chan->num_conf_req++;
f2fcfcd6
GP		 4177 if (result != L2CAP_CONF_SUCCESS)
4178 goto done;
4179 break;
1da177e4
LT		 4180 }
4181
8e87d142 4182 default:
6be36555 4183 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4184
ba13ccd9 4185 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4186 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4187 goto done;
4188 }
4189
59e54bd1 4190 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4191 goto done;
4192
c1360a1c 4193 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4194
c1360a1c 4195 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4196 set_default_fcs(chan);
fcc203c3 4197
105bdf9e
MM		 4198 if (chan->mode == L2CAP_MODE_ERTM ||
4199 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4200 err = l2cap_ertm_init(chan);
0565c1c2 4201
3c588192 4202 if (err < 0)
5e4e3972 4203 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4204 else
4205 l2cap_chan_ready(chan);
1da177e4
LT		 4206 }
4207
4208done:
6be36555 4209 l2cap_chan_unlock(chan);
3c588192 4210 return err;
1da177e4
LT		 4211}
4212
2d792818 4213static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4214 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4215 u8 *data)
1da177e4
LT		 4216{
4217 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4218 struct l2cap_disconn_rsp rsp;
4219 u16 dcid, scid;
48454079 4220 struct l2cap_chan *chan;
1da177e4 4221
cb3b3152
JH		 4222 if (cmd_len != sizeof(*req))
4223 return -EPROTO;
4224
1da177e4
LT		 4225 scid = __le16_to_cpu(req->scid);
4226 dcid = __le16_to_cpu(req->dcid);
4227
4228 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4229
3df91ea2
AE		 4230 mutex_lock(&conn->chan_lock);
4231
4232 chan = __l2cap_get_chan_by_scid(conn, dcid);
4233 if (!chan) {
4234 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4235 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4236 return 0;
3df91ea2 4237 }
1da177e4 4238
6be36555
AE		 4239 l2cap_chan_lock(chan);
4240
fe4128e0
GP		 4241 rsp.dcid = cpu_to_le16(chan->scid);
4242 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4243 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4244
5ec1bbe5 4245 chan->ops->set_shutdown(chan);
1da177e4 4246
61d6ef3e 4247 l2cap_chan_hold(chan);
48454079 4248 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4249
4250 l2cap_chan_unlock(chan);
1da177e4 4251
80b98027 4252 chan->ops->close(chan);
61d6ef3e 4253 l2cap_chan_put(chan);
3df91ea2
AE		 4254
4255 mutex_unlock(&conn->chan_lock);
4256
1da177e4
LT		 4257 return 0;
4258}
4259
2d792818 4260static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4261 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4262 u8 *data)
1da177e4
LT		 4263{
4264 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4265 u16 dcid, scid;
48454079 4266 struct l2cap_chan *chan;
1da177e4 4267
cb3b3152
JH		 4268 if (cmd_len != sizeof(*rsp))
4269 return -EPROTO;
4270
1da177e4
LT		 4271 scid = __le16_to_cpu(rsp->scid);
4272 dcid = __le16_to_cpu(rsp->dcid);
4273
4274 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4275
3df91ea2
AE		 4276 mutex_lock(&conn->chan_lock);
4277
4278 chan = __l2cap_get_chan_by_scid(conn, scid);
4279 if (!chan) {
4280 mutex_unlock(&conn->chan_lock);
1da177e4 4281 return 0;
3df91ea2 4282 }
1da177e4 4283
6be36555 4284 l2cap_chan_lock(chan);
48454079 4285
61d6ef3e 4286 l2cap_chan_hold(chan);
48454079 4287 l2cap_chan_del(chan, 0);
6be36555
AE		 4288
4289 l2cap_chan_unlock(chan);
1da177e4 4290
80b98027 4291 chan->ops->close(chan);
61d6ef3e 4292 l2cap_chan_put(chan);
3df91ea2
AE		 4293
4294 mutex_unlock(&conn->chan_lock);
4295
1da177e4
LT		 4296 return 0;
4297}
4298
2d792818 4299static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4300 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4301 u8 *data)
1da177e4
LT		 4302{
4303 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4304 u16 type;
4305
cb3b3152
JH		 4306 if (cmd_len != sizeof(*req))
4307 return -EPROTO;
4308
1da177e4
LT		 4309 type = __le16_to_cpu(req->type);
4310
4311 BT_DBG("type 0x%4.4x", type);
4312
f0709e03
MH		 4313 if (type == L2CAP_IT_FEAT_MASK) {
4314 u8 buf[8];
44dd46de 4315 u32 feat_mask = l2cap_feat_mask;
f0709e03 4316 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4317 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4318 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4319 if (!disable_ertm)
fcc203c3 4320 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4321 | L2CAP_FEAT_FCS;
848566b3 4322 if (conn->hs_enabled)
6327eb98 4323 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4324 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4325
1b7bf4ed 4326 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4327 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4328 buf);
e1027a7c
MH		 4329 } else if (type == L2CAP_IT_FIXED_CHAN) {
4330 u8 buf[12];
4331 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4332
848566b3 4333 if (conn->hs_enabled)
50a147cd
MM		 4334 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4335 else
4336 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4337
ac73498c
AE		 4338 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4339 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4340 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4341 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4342 buf);
f0709e03
MH		 4343 } else {
4344 struct l2cap_info_rsp rsp;
4345 rsp.type = cpu_to_le16(type);
ac73498c 4346 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4347 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4348 &rsp);
f0709e03 4349 }
1da177e4
LT		 4350
4351 return 0;
4352}
4353
2d792818 4354static inline int l2cap_information_rsp(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_rsp *rsp = (struct l2cap_info_rsp *) data;
4359 u16 type, result;
4360
3f6fa3d4 4361 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4362 return -EPROTO;
4363
1da177e4
LT		 4364 type = __le16_to_cpu(rsp->type);
4365 result = __le16_to_cpu(rsp->result);
4366
4367 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4368
e90165be
AE		 4369 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4370 if (cmd->ident != conn->info_ident ||
2d792818 4371 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4372 return 0;
4373
17cd3f37 4374 cancel_delayed_work(&conn->info_timer);
4e8402a3 4375
adb08ede
VT		 4376 if (result != L2CAP_IR_SUCCESS) {
4377 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4378 conn->info_ident = 0;
4379
4380 l2cap_conn_start(conn);
4381
4382 return 0;
4383 }
4384
978c93b9
AE		 4385 switch (type) {
4386 case L2CAP_IT_FEAT_MASK:
83985319 4387 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4388
47ec1dcd 4389 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4390 struct l2cap_info_req req;
ac73498c 4391 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4392
4393 conn->info_ident = l2cap_get_ident(conn);
4394
4395 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4396 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4397 } else {
4398 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4399 conn->info_ident = 0;
4400
4401 l2cap_conn_start(conn);
4402 }
978c93b9
AE		 4403 break;
4404
4405 case L2CAP_IT_FIXED_CHAN:
4406 conn->fixed_chan_mask = rsp->data[0];
984947dc 4407 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4408 conn->info_ident = 0;
984947dc
MH		 4409
4410 l2cap_conn_start(conn);
978c93b9 4411 break;
984947dc 4412 }
4e8402a3 4413
1da177e4
LT		 4414 return 0;
4415}
4416
1700915f
MM		 4417static int l2cap_create_channel_req(struct l2cap_conn *conn,
4418 struct l2cap_cmd_hdr *cmd,
4419 u16 cmd_len, void *data)
f94ff6ff
MM		 4420{
4421 struct l2cap_create_chan_req *req = data;
6e1df6a6 4422 struct l2cap_create_chan_rsp rsp;
1700915f 4423 struct l2cap_chan *chan;
6e1df6a6 4424 struct hci_dev *hdev;
f94ff6ff
MM		 4425 u16 psm, scid;
4426
4427 if (cmd_len != sizeof(*req))
4428 return -EPROTO;
4429
848566b3 4430 if (!conn->hs_enabled)
f94ff6ff
MM		 4431 return -EINVAL;
4432
4433 psm = le16_to_cpu(req->psm);
4434 scid = le16_to_cpu(req->scid);
4435
ad0ac6ca 4436 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4437
6e1df6a6 4438 /* For controller id 0 make BR/EDR connection */
6ed971ca 4439 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4440 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4441 req->amp_id);
4442 return 0;
4443 }
1700915f 4444
6e1df6a6
AE		 4445 /* Validate AMP controller id */
4446 hdev = hci_dev_get(req->amp_id);
4447 if (!hdev)
4448 goto error;
1700915f 4449
6e1df6a6
AE		 4450 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4451 hci_dev_put(hdev);
4452 goto error;
4453 }
1700915f 4454
6e1df6a6
AE		 4455 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4456 req->amp_id);
4457 if (chan) {
4458 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4459 struct hci_conn *hs_hcon;
1700915f 4460
98e0f7ea
MH		 4461 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4462 &conn->hcon->dst);
6e1df6a6
AE		 4463 if (!hs_hcon) {
4464 hci_dev_put(hdev);
662d652d
JH		 4465 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4466 chan->dcid);
4467 return 0;
1700915f
MM		 4468 }
4469
6e1df6a6
AE		 4470 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4471
6e1df6a6
AE		 4472 mgr->bredr_chan = chan;
4473 chan->hs_hcon = hs_hcon;
fd45bf4c 4474 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4475 conn->mtu = hdev->block_mtu;
1700915f 4476 }
f94ff6ff 4477
6e1df6a6 4478 hci_dev_put(hdev);
f94ff6ff
MM		 4479
4480 return 0;
6e1df6a6
AE		 4481
4482error:
4483 rsp.dcid = 0;
4484 rsp.scid = cpu_to_le16(scid);
4485 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4486 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4487
4488 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4489 sizeof(rsp), &rsp);
4490
dc280801 4491 return 0;
f94ff6ff
MM		 4492}
4493
8eb200bd
MM		 4494static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4495{
4496 struct l2cap_move_chan_req req;
4497 u8 ident;
4498
4499 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4500
4501 ident = l2cap_get_ident(chan->conn);
4502 chan->ident = ident;
4503
4504 req.icid = cpu_to_le16(chan->scid);
4505 req.dest_amp_id = dest_amp_id;
4506
4507 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4508 &req);
4509
4510 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4511}
4512
1500109b 4513static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4514{
4515 struct l2cap_move_chan_rsp rsp;
4516
1500109b 4517 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4518
1500109b 4519 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4520 rsp.result = cpu_to_le16(result);
4521
1500109b
MM		 4522 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4523 sizeof(rsp), &rsp);
8d5a04a1
MM		 4524}
4525
5b155ef9 4526static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4527{
4528 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4529
5b155ef9 4530 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4531
5b155ef9 4532 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4533
5b155ef9 4534 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4535 cfm.result = cpu_to_le16(result);
4536
5b155ef9
MM		 4537 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4538 sizeof(cfm), &cfm);
4539
4540 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4541}
4542
4543static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4544{
4545 struct l2cap_move_chan_cfm cfm;
4546
4547 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4548
4549 cfm.icid = cpu_to_le16(icid);
4550 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4551
4552 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4553 sizeof(cfm), &cfm);
8d5a04a1
MM		 4554}
4555
4556static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4557 u16 icid)
8d5a04a1
MM		 4558{
4559 struct l2cap_move_chan_cfm_rsp rsp;
4560
ad0ac6ca 4561 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4562
4563 rsp.icid = cpu_to_le16(icid);
4564 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4565}
4566
5f3847a4
MM		 4567static void __release_logical_link(struct l2cap_chan *chan)
4568{
4569 chan->hs_hchan = NULL;
4570 chan->hs_hcon = NULL;
4571
4572 /* Placeholder - release the logical link */
4573}
4574
1500109b
MM		 4575static void l2cap_logical_fail(struct l2cap_chan *chan)
4576{
4577 /* Logical link setup failed */
4578 if (chan->state != BT_CONNECTED) {
4579 /* Create channel failure, disconnect */
5e4e3972 4580 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4581 return;
4582 }
4583
4584 switch (chan->move_role) {
4585 case L2CAP_MOVE_ROLE_RESPONDER:
4586 l2cap_move_done(chan);
4587 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4588 break;
4589 case L2CAP_MOVE_ROLE_INITIATOR:
4590 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4591 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4592 /* Remote has only sent pending or
4593 * success responses, clean up
4594 */
4595 l2cap_move_done(chan);
4596 }
4597
4598 /* Other amp move states imply that the move
4599 * has already aborted
4600 */
4601 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4602 break;
4603 }
4604}
4605
4606static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4607 struct hci_chan *hchan)
4608{
4609 struct l2cap_conf_rsp rsp;
1500109b 4610
336178a3 4611 chan->hs_hchan = hchan;
1500109b
MM		 4612 chan->hs_hcon->l2cap_data = chan->conn;
4613
35ba9561 4614 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4615
4616 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4617 int err;
1500109b
MM		 4618
4619 set_default_fcs(chan);
4620
4621 err = l2cap_ertm_init(chan);
4622 if (err < 0)
5e4e3972 4623 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4624 else
4625 l2cap_chan_ready(chan);
4626 }
4627}
4628
4629static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4630 struct hci_chan *hchan)
4631{
4632 chan->hs_hcon = hchan->conn;
4633 chan->hs_hcon->l2cap_data = chan->conn;
4634
4635 BT_DBG("move_state %d", chan->move_state);
4636
4637 switch (chan->move_state) {
4638 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4639 /* Move confirm will be sent after a success
4640 * response is received
4641 */
4642 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4643 break;
4644 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4645 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4646 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4647 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4648 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4649 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4650 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4651 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4652 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4653 }
4654 break;
4655 default:
4656 /* Move was not in expected state, free the channel */
4657 __release_logical_link(chan);
4658
4659 chan->move_state = L2CAP_MOVE_STABLE;
4660 }
4661}
4662
4663/* Call with chan locked */
27695fb4
AE		 4664void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4665 u8 status)
5b155ef9 4666{
1500109b
MM		 4667 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4668
4669 if (status) {
4670 l2cap_logical_fail(chan);
4671 __release_logical_link(chan);
4672 return;
4673 }
4674
4675 if (chan->state != BT_CONNECTED) {
4676 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4677 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4678 l2cap_logical_finish_create(chan, hchan);
4679 } else {
4680 l2cap_logical_finish_move(chan, hchan);
4681 }
5b155ef9
MM		 4682}
4683
3f7a56c4
MM		 4684void l2cap_move_start(struct l2cap_chan *chan)
4685{
4686 BT_DBG("chan %p", chan);
4687
6ed971ca 4688 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4689 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4690 return;
4691 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4692 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4693 /* Placeholder - start physical link setup */
4694 } else {
4695 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4696 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4697 chan->move_id = 0;
4698 l2cap_move_setup(chan);
4699 l2cap_send_move_chan_req(chan, 0);
4700 }
4701}
4702
8eb200bd
MM		 4703static void l2cap_do_create(struct l2cap_chan *chan, int result,
4704 u8 local_amp_id, u8 remote_amp_id)
4705{
62748ca1
AE		 4706 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4707 local_amp_id, remote_amp_id);
4708
12d6cc60
AE		 4709 chan->fcs = L2CAP_FCS_NONE;
4710
62748ca1
AE		 4711 /* Outgoing channel on AMP */
4712 if (chan->state == BT_CONNECT) {
4713 if (result == L2CAP_CR_SUCCESS) {
4714 chan->local_amp_id = local_amp_id;
4715 l2cap_send_create_chan_req(chan, remote_amp_id);
4716 } else {
4717 /* Revert to BR/EDR connect */
4718 l2cap_send_conn_req(chan);
4719 }
4720
4721 return;
4722 }
4723
4724 /* Incoming channel on AMP */
4725 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4726 struct l2cap_conn_rsp rsp;
4727 char buf[128];
4728 rsp.scid = cpu_to_le16(chan->dcid);
4729 rsp.dcid = cpu_to_le16(chan->scid);
4730
8eb200bd
MM		 4731 if (result == L2CAP_CR_SUCCESS) {
4732 /* Send successful response */
62cd50e2
AE		 4733 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4734 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4735 } else {
4736 /* Send negative response */
62cd50e2
AE		 4737 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4738 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4739 }
4740
4741 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4742 sizeof(rsp), &rsp);
4743
4744 if (result == L2CAP_CR_SUCCESS) {
4745 __l2cap_state_change(chan, BT_CONFIG);
4746 set_bit(CONF_REQ_SENT, &chan->conf_state);
4747 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4748 L2CAP_CONF_REQ,
4749 l2cap_build_conf_req(chan, buf), buf);
4750 chan->num_conf_req++;
4751 }
8eb200bd
MM		 4752 }
4753}
4754
4755static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4756 u8 remote_amp_id)
4757{
4758 l2cap_move_setup(chan);
4759 chan->move_id = local_amp_id;
4760 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4761
4762 l2cap_send_move_chan_req(chan, remote_amp_id);
4763}
4764
4765static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4766{
4767 struct hci_chan *hchan = NULL;
4768
4769 /* Placeholder - get hci_chan for logical link */
4770
4771 if (hchan) {
4772 if (hchan->state == BT_CONNECTED) {
4773 /* Logical link is ready to go */
4774 chan->hs_hcon = hchan->conn;
4775 chan->hs_hcon->l2cap_data = chan->conn;
4776 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4777 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4778
4779 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4780 } else {
4781 /* Wait for logical link to be ready */
4782 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4783 }
4784 } else {
4785 /* Logical link not available */
4786 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4787 }
4788}
4789
4790static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4791{
4792 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4793 u8 rsp_result;
4794 if (result == -EINVAL)
4795 rsp_result = L2CAP_MR_BAD_ID;
4796 else
4797 rsp_result = L2CAP_MR_NOT_ALLOWED;
4798
4799 l2cap_send_move_chan_rsp(chan, rsp_result);
4800 }
4801
4802 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4803 chan->move_state = L2CAP_MOVE_STABLE;
4804
4805 /* Restart data transmission */
4806 l2cap_ertm_send(chan);
4807}
4808
a514b17f
AE		 4809/* Invoke with locked chan */
4810void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4811{
770bfefa 4812 u8 local_amp_id = chan->local_amp_id;
fffadc08 4813 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4814
8eb200bd
MM		 4815 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4816 chan, result, local_amp_id, remote_amp_id);
4817
8eb200bd
MM		 4818 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4819 l2cap_chan_unlock(chan);
4820 return;
4821 }
4822
4823 if (chan->state != BT_CONNECTED) {
4824 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4825 } else if (result != L2CAP_MR_SUCCESS) {
4826 l2cap_do_move_cancel(chan, result);
4827 } else {
4828 switch (chan->move_role) {
4829 case L2CAP_MOVE_ROLE_INITIATOR:
4830 l2cap_do_move_initiate(chan, local_amp_id,
4831 remote_amp_id);
4832 break;
4833 case L2CAP_MOVE_ROLE_RESPONDER:
4834 l2cap_do_move_respond(chan, result);
4835 break;
4836 default:
4837 l2cap_do_move_cancel(chan, result);
4838 break;
4839 }
4840 }
8eb200bd
MM		 4841}
4842
8d5a04a1 4843static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4844 struct l2cap_cmd_hdr *cmd,
4845 u16 cmd_len, void *data)
8d5a04a1
MM		 4846{
4847 struct l2cap_move_chan_req *req = data;
1500109b 4848 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4849 struct l2cap_chan *chan;
8d5a04a1
MM		 4850 u16 icid = 0;
4851 u16 result = L2CAP_MR_NOT_ALLOWED;
4852
4853 if (cmd_len != sizeof(*req))
4854 return -EPROTO;
4855
4856 icid = le16_to_cpu(req->icid);
4857
ad0ac6ca 4858 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4859
848566b3 4860 if (!conn->hs_enabled)
8d5a04a1
MM		 4861 return -EINVAL;
4862
02b0fbb9
MM		 4863 chan = l2cap_get_chan_by_dcid(conn, icid);
4864 if (!chan) {
1500109b
MM		 4865 rsp.icid = cpu_to_le16(icid);
4866 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4867 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4868 sizeof(rsp), &rsp);
02b0fbb9
MM		 4869 return 0;
4870 }
4871
1500109b
MM		 4872 chan->ident = cmd->ident;
4873
02b0fbb9
MM		 4874 if (chan->scid < L2CAP_CID_DYN_START ||
4875 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4876 (chan->mode != L2CAP_MODE_ERTM &&
4877 chan->mode != L2CAP_MODE_STREAMING)) {
4878 result = L2CAP_MR_NOT_ALLOWED;
4879 goto send_move_response;
4880 }
4881
4882 if (chan->local_amp_id == req->dest_amp_id) {
4883 result = L2CAP_MR_SAME_ID;
4884 goto send_move_response;
4885 }
4886
6ed971ca 4887 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4888 struct hci_dev *hdev;
4889 hdev = hci_dev_get(req->dest_amp_id);
4890 if (!hdev || hdev->dev_type != HCI_AMP ||
4891 !test_bit(HCI_UP, &hdev->flags)) {
4892 if (hdev)
4893 hci_dev_put(hdev);
4894
4895 result = L2CAP_MR_BAD_ID;
4896 goto send_move_response;
4897 }
4898 hci_dev_put(hdev);
4899 }
4900
4901 /* Detect a move collision. Only send a collision response
4902 * if this side has "lost", otherwise proceed with the move.
4903 * The winner has the larger bd_addr.
4904 */
4905 if ((__chan_is_moving(chan) ||
4906 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4907 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4908 result = L2CAP_MR_COLLISION;
4909 goto send_move_response;
4910 }
4911
02b0fbb9
MM		 4912 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4913 l2cap_move_setup(chan);
4914 chan->move_id = req->dest_amp_id;
4915 icid = chan->dcid;
4916
6ed971ca 4917 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4918 /* Moving to BR/EDR */
4919 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4920 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4921 result = L2CAP_MR_PEND;
4922 } else {
4923 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4924 result = L2CAP_MR_SUCCESS;
4925 }
4926 } else {
4927 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4928 /* Placeholder - uncomment when amp functions are available */
4929 /*amp_accept_physical(chan, req->dest_amp_id);*/
4930 result = L2CAP_MR_PEND;
4931 }
4932
4933send_move_response:
1500109b 4934 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4935
02b0fbb9
MM		 4936 l2cap_chan_unlock(chan);
4937
8d5a04a1
MM		 4938 return 0;
4939}
4940
5b155ef9
MM		 4941static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4942{
4943 struct l2cap_chan *chan;
4944 struct hci_chan *hchan = NULL;
4945
4946 chan = l2cap_get_chan_by_scid(conn, icid);
4947 if (!chan) {
4948 l2cap_send_move_chan_cfm_icid(conn, icid);
4949 return;
4950 }
4951
4952 __clear_chan_timer(chan);
4953 if (result == L2CAP_MR_PEND)
4954 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4955
4956 switch (chan->move_state) {
4957 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4958 /* Move confirm will be sent when logical link
4959 * is complete.
4960 */
4961 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4962 break;
4963 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4964 if (result == L2CAP_MR_PEND) {
4965 break;
4966 } else if (test_bit(CONN_LOCAL_BUSY,
4967 &chan->conn_state)) {
4968 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4969 } else {
4970 /* Logical link is up or moving to BR/EDR,
4971 * proceed with move
4972 */
4973 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4974 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4975 }
4976 break;
4977 case L2CAP_MOVE_WAIT_RSP:
4978 /* Moving to AMP */
4979 if (result == L2CAP_MR_SUCCESS) {
4980 /* Remote is ready, send confirm immediately
4981 * after logical link is ready
4982 */
4983 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4984 } else {
4985 /* Both logical link and move success
4986 * are required to confirm
4987 */
4988 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4989 }
4990
4991 /* Placeholder - get hci_chan for logical link */
4992 if (!hchan) {
4993 /* Logical link not available */
4994 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4995 break;
4996 }
4997
4998 /* If the logical link is not yet connected, do not
4999 * send confirmation.
5000 */
5001 if (hchan->state != BT_CONNECTED)
5002 break;
5003
5004 /* Logical link is already ready to go */
5005
5006 chan->hs_hcon = hchan->conn;
5007 chan->hs_hcon->l2cap_data = chan->conn;
5008
5009 if (result == L2CAP_MR_SUCCESS) {
5010 /* Can confirm now */
5011 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5012 } else {
5013 /* Now only need move success
5014 * to confirm
5015 */
5016 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5017 }
5018
5019 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5020 break;
5021 default:
5022 /* Any other amp move state means the move failed. */
5023 chan->move_id = chan->local_amp_id;
5024 l2cap_move_done(chan);
5025 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5026 }
5027
5028 l2cap_chan_unlock(chan);
5029}
5030
5031static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5032 u16 result)
5033{
5034 struct l2cap_chan *chan;
5035
5036 chan = l2cap_get_chan_by_ident(conn, ident);
5037 if (!chan) {
5038 /* Could not locate channel, icid is best guess */
5039 l2cap_send_move_chan_cfm_icid(conn, icid);
5040 return;
5041 }
5042
5043 __clear_chan_timer(chan);
5044
5045 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5046 if (result == L2CAP_MR_COLLISION) {
5047 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5048 } else {
5049 /* Cleanup - cancel move */
5050 chan->move_id = chan->local_amp_id;
5051 l2cap_move_done(chan);
5052 }
5053 }
5054
5055 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5056
5057 l2cap_chan_unlock(chan);
5058}
5059
5060static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5061 struct l2cap_cmd_hdr *cmd,
5062 u16 cmd_len, void *data)
8d5a04a1
MM		 5063{
5064 struct l2cap_move_chan_rsp *rsp = data;
5065 u16 icid, result;
5066
5067 if (cmd_len != sizeof(*rsp))
5068 return -EPROTO;
5069
5070 icid = le16_to_cpu(rsp->icid);
5071 result = le16_to_cpu(rsp->result);
5072
ad0ac6ca 5073 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5074
5b155ef9
MM		 5075 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5076 l2cap_move_continue(conn, icid, result);
5077 else
5078 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5079
5080 return 0;
5081}
5082
5f3847a4
MM		 5083static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5084 struct l2cap_cmd_hdr *cmd,
5085 u16 cmd_len, void *data)
8d5a04a1
MM		 5086{
5087 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5088 struct l2cap_chan *chan;
8d5a04a1
MM		 5089 u16 icid, result;
5090
5091 if (cmd_len != sizeof(*cfm))
5092 return -EPROTO;
5093
5094 icid = le16_to_cpu(cfm->icid);
5095 result = le16_to_cpu(cfm->result);
5096
ad0ac6ca 5097 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5098
5f3847a4
MM		 5099 chan = l2cap_get_chan_by_dcid(conn, icid);
5100 if (!chan) {
5101 /* Spec requires a response even if the icid was not found */
5102 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5103 return 0;
5104 }
5105
5106 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5107 if (result == L2CAP_MC_CONFIRMED) {
5108 chan->local_amp_id = chan->move_id;
6ed971ca 5109 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5110 __release_logical_link(chan);
5111 } else {
5112 chan->move_id = chan->local_amp_id;
5113 }
5114
5115 l2cap_move_done(chan);
5116 }
5117
8d5a04a1
MM		 5118 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5119
5f3847a4
MM		 5120 l2cap_chan_unlock(chan);
5121
8d5a04a1
MM		 5122 return 0;
5123}
5124
5125static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5126 struct l2cap_cmd_hdr *cmd,
5127 u16 cmd_len, void *data)
8d5a04a1
MM		 5128{
5129 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5130 struct l2cap_chan *chan;
8d5a04a1
MM		 5131 u16 icid;
5132
5133 if (cmd_len != sizeof(*rsp))
5134 return -EPROTO;
5135
5136 icid = le16_to_cpu(rsp->icid);
5137
ad0ac6ca 5138 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5139
3fd71a0a
MM		 5140 chan = l2cap_get_chan_by_scid(conn, icid);
5141 if (!chan)
5142 return 0;
5143
5144 __clear_chan_timer(chan);
5145
5146 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5147 chan->local_amp_id = chan->move_id;
5148
6ed971ca 5149 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5150 __release_logical_link(chan);
5151
5152 l2cap_move_done(chan);
5153 }
5154
5155 l2cap_chan_unlock(chan);
5156
8d5a04a1
MM		 5157 return 0;
5158}
5159
e2174ca4 5160static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 5161 u16 to_multiplier)
de73115a
CT		 5162{
5163 u16 max_latency;
5164
5165 if (min > max || min < 6 || max > 3200)
5166 return -EINVAL;
5167
5168 if (to_multiplier < 10 || to_multiplier > 3200)
5169 return -EINVAL;
5170
5171 if (max >= to_multiplier * 8)
5172 return -EINVAL;
5173
5174 max_latency = (to_multiplier * 8 / max) - 1;
5175 if (latency > 499 || latency > max_latency)
5176 return -EINVAL;
5177
5178 return 0;
5179}
5180
5181static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818
GP		 5182 struct l2cap_cmd_hdr *cmd,
5183 u8 *data)
de73115a
CT		 5184{
5185 struct hci_conn *hcon = conn->hcon;
5186 struct l2cap_conn_param_update_req *req;
5187 struct l2cap_conn_param_update_rsp rsp;
5188 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 5189 int err;
de73115a
CT		 5190
5191 if (!(hcon->link_mode & HCI_LM_MASTER))
5192 return -EINVAL;
5193
5194 cmd_len = __le16_to_cpu(cmd->len);
5195 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5196 return -EPROTO;
5197
5198 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5199 min = __le16_to_cpu(req->min);
5200 max = __le16_to_cpu(req->max);
de73115a
CT		 5201 latency = __le16_to_cpu(req->latency);
5202 to_multiplier = __le16_to_cpu(req->to_multiplier);
5203
5204 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5205 min, max, latency, to_multiplier);
de73115a
CT		 5206
5207 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5208
5209 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5210 if (err)
ac73498c 5211 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5212 else
ac73498c 5213 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5214
5215 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5216 sizeof(rsp), &rsp);
de73115a 5217
2ce603eb
CT		 5218 if (!err)
5219 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5220
de73115a
CT		 5221 return 0;
5222}
5223
3300d9a9 5224static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5225 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5226 u8 *data)
3300d9a9
CT		 5227{
5228 int err = 0;
5229
5230 switch (cmd->code) {
5231 case L2CAP_COMMAND_REJ:
cb3b3152 5232 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5233 break;
5234
5235 case L2CAP_CONN_REQ:
cb3b3152 5236 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5237 break;
5238
5239 case L2CAP_CONN_RSP:
f5a2598d 5240 case L2CAP_CREATE_CHAN_RSP:
9245e737 5241 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5242 break;
5243
5244 case L2CAP_CONF_REQ:
5245 err = l2cap_config_req(conn, cmd, cmd_len, data);
5246 break;
5247
5248 case L2CAP_CONF_RSP:
9245e737 5249 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5250 break;
5251
5252 case L2CAP_DISCONN_REQ:
cb3b3152 5253 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5254 break;
5255
5256 case L2CAP_DISCONN_RSP:
9245e737 5257 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5258 break;
5259
5260 case L2CAP_ECHO_REQ:
5261 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5262 break;
5263
5264 case L2CAP_ECHO_RSP:
5265 break;
5266
5267 case L2CAP_INFO_REQ:
cb3b3152 5268 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5269 break;
5270
5271 case L2CAP_INFO_RSP:
9245e737 5272 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5273 break;
5274
f94ff6ff
MM		 5275 case L2CAP_CREATE_CHAN_REQ:
5276 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5277 break;
5278
8d5a04a1
MM		 5279 case L2CAP_MOVE_CHAN_REQ:
5280 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5281 break;
5282
5283 case L2CAP_MOVE_CHAN_RSP:
9245e737 5284 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5285 break;
5286
5287 case L2CAP_MOVE_CHAN_CFM:
5288 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5289 break;
5290
5291 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5292 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5293 break;
5294
3300d9a9
CT		 5295 default:
5296 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5297 err = -EINVAL;
5298 break;
5299 }
5300
5301 return err;
5302}
5303
5304static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2d792818 5305 struct l2cap_cmd_hdr *cmd, u8 *data)
3300d9a9
CT		 5306{
5307 switch (cmd->code) {
5308 case L2CAP_COMMAND_REJ:
5309 return 0;
5310
5311 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 5312 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 5313
5314 case L2CAP_CONN_PARAM_UPDATE_RSP:
5315 return 0;
5316
5317 default:
5318 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5319 return -EINVAL;
5320 }
5321}
5322
c5623556
JH		 5323static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5324 struct sk_buff *skb)
5325{
69c4e4e8 5326 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5327 struct l2cap_cmd_hdr *cmd;
5328 u16 len;
c5623556
JH		 5329 int err;
5330
69c4e4e8 5331 if (hcon->type != LE_LINK)
3b166295 5332 goto drop;
69c4e4e8 5333
4f3e219d
MH		 5334 if (skb->len < L2CAP_CMD_HDR_SIZE)
5335 goto drop;
c5623556 5336
4f3e219d
MH		 5337 cmd = (void *) skb->data;
5338 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5339
4f3e219d 5340 len = le16_to_cpu(cmd->len);
c5623556 5341
4f3e219d 5342 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5343
4f3e219d
MH		 5344 if (len != skb->len || !cmd->ident) {
5345 BT_DBG("corrupted command");
5346 goto drop;
5347 }
c5623556 5348
4f3e219d
MH		 5349 err = l2cap_le_sig_cmd(conn, cmd, skb->data);
5350 if (err) {
5351 struct l2cap_cmd_rej_unk rej;
c5623556 5352
4f3e219d 5353 BT_ERR("Wrong link type (%d)", err);
c5623556 5354
a521149a 5355 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5356 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5357 sizeof(rej), &rej);
c5623556
JH		 5358 }
5359
3b166295 5360drop:
c5623556
JH		 5361 kfree_skb(skb);
5362}
5363
3300d9a9 5364static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5365 struct sk_buff *skb)
1da177e4 5366{
69c4e4e8 5367 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5368 u8 *data = skb->data;
5369 int len = skb->len;
5370 struct l2cap_cmd_hdr cmd;
3300d9a9 5371 int err;
1da177e4
LT		 5372
5373 l2cap_raw_recv(conn, skb);
5374
69c4e4e8 5375 if (hcon->type != ACL_LINK)
3b166295 5376 goto drop;
69c4e4e8 5377
1da177e4 5378 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5379 u16 cmd_len;
1da177e4
LT		 5380 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5381 data += L2CAP_CMD_HDR_SIZE;
5382 len -= L2CAP_CMD_HDR_SIZE;
5383
88219a0f 5384 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5385
2d792818
GP		 5386 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5387 cmd.ident);
1da177e4 5388
88219a0f 5389 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5390 BT_DBG("corrupted command");
5391 break;
5392 }
5393
c5623556 5394 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5395 if (err) {
e2fd318e 5396 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5397
5398 BT_ERR("Wrong link type (%d)", err);
1da177e4 5399
a521149a 5400 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5401 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5402 sizeof(rej), &rej);
1da177e4
LT		 5403 }
5404
88219a0f
AV		 5405 data += cmd_len;
5406 len -= cmd_len;
1da177e4
LT		 5407 }
5408
3b166295 5409drop:
1da177e4
LT		 5410 kfree_skb(skb);
5411}
5412
47d1ec61 5413static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5414{
5415 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5416 int hdr_size;
5417
5418 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5419 hdr_size = L2CAP_EXT_HDR_SIZE;
5420 else
5421 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5422
47d1ec61 5423 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5424 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5425 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5426 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5427
5428 if (our_fcs != rcv_fcs)
7a560e5c 5429 return -EBADMSG;
fcc203c3
GP		 5430 }
5431 return 0;
5432}
5433
6ea00485 5434static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5435{
e31f7633 5436 struct l2cap_ctrl control;
d5392c8f 5437
e31f7633 5438 BT_DBG("chan %p", chan);
d5392c8f 5439
e31f7633
MM		 5440 memset(&control, 0, sizeof(control));
5441 control.sframe = 1;
5442 control.final = 1;
5443 control.reqseq = chan->buffer_seq;
5444 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5445
e2ab4353 5446 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5447 control.super = L2CAP_SUPER_RNR;
5448 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5449 }
5450
e31f7633
MM		 5451 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5452 chan->unacked_frames > 0)
5453 __set_retrans_timer(chan);
d5392c8f 5454
e31f7633 5455 /* Send pending iframes */
525cd185 5456 l2cap_ertm_send(chan);
d5392c8f 5457
e2ab4353 5458 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5459 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5460 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5461 * send it now.
5462 */
5463 control.super = L2CAP_SUPER_RR;
5464 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5465 }
5466}
5467
2d792818
GP		 5468static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5469 struct sk_buff **last_frag)
18778a63 5470{
84084a31
MM		 5471 /* skb->len reflects data in skb as well as all fragments
5472 * skb->data_len reflects only data in fragments
5473 */
5474 if (!skb_has_frag_list(skb))
5475 skb_shinfo(skb)->frag_list = new_frag;
5476
5477 new_frag->next = NULL;
5478
5479 (*last_frag)->next = new_frag;
5480 *last_frag = new_frag;
5481
5482 skb->len += new_frag->len;
5483 skb->data_len += new_frag->len;
5484 skb->truesize += new_frag->truesize;
5485}
5486
4b51dae9
MM		 5487static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5488 struct l2cap_ctrl *control)
84084a31
MM		 5489{
5490 int err = -EINVAL;
18778a63 5491
4b51dae9 5492 switch (control->sar) {
7e0ef6ee 5493 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5494 if (chan->sdu)
5495 break;
18778a63 5496
80b98027 5497 err = chan->ops->recv(chan, skb);
84084a31 5498 break;
18778a63 5499
7e0ef6ee 5500 case L2CAP_SAR_START:
84084a31
MM		 5501 if (chan->sdu)
5502 break;
18778a63 5503
6f61fd47 5504 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5505 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5506
84084a31
MM		 5507 if (chan->sdu_len > chan->imtu) {
5508 err = -EMSGSIZE;
5509 break;
5510 }
1890d36b 5511
84084a31
MM		 5512 if (skb->len >= chan->sdu_len)
5513 break;
18778a63 5514
84084a31
MM		 5515 chan->sdu = skb;
5516 chan->sdu_last_frag = skb;
18778a63 5517
84084a31
MM		 5518 skb = NULL;
5519 err = 0;
18778a63
GP		 5520 break;
5521
7e0ef6ee 5522 case L2CAP_SAR_CONTINUE:
6f61fd47 5523 if (!chan->sdu)
84084a31 5524 break;
18778a63 5525
84084a31
MM		 5526 append_skb_frag(chan->sdu, skb,
5527 &chan->sdu_last_frag);
5528 skb = NULL;
18778a63 5529
84084a31
MM		 5530 if (chan->sdu->len >= chan->sdu_len)
5531 break;
4178ba46 5532
84084a31 5533 err = 0;
18778a63
GP		 5534 break;
5535
7e0ef6ee 5536 case L2CAP_SAR_END:
6f61fd47 5537 if (!chan->sdu)
84084a31 5538 break;
18778a63 5539
84084a31
MM		 5540 append_skb_frag(chan->sdu, skb,
5541 &chan->sdu_last_frag);
5542 skb = NULL;
4178ba46 5543
84084a31
MM		 5544 if (chan->sdu->len != chan->sdu_len)
5545 break;
18778a63 5546
80b98027 5547 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5548
84084a31
MM		 5549 if (!err) {
5550 /* Reassembly complete */
5551 chan->sdu = NULL;
5552 chan->sdu_last_frag = NULL;
5553 chan->sdu_len = 0;
1890d36b 5554 }
18778a63
GP		 5555 break;
5556 }
5557
84084a31
MM		 5558 if (err) {
5559 kfree_skb(skb);
5560 kfree_skb(chan->sdu);
5561 chan->sdu = NULL;
5562 chan->sdu_last_frag = NULL;
5563 chan->sdu_len = 0;
5564 }
18778a63 5565
84084a31 5566 return err;
18778a63
GP		 5567}
5568
32b32735
MM		 5569static int l2cap_resegment(struct l2cap_chan *chan)
5570{
5571 /* Placeholder */
5572 return 0;
5573}
5574
61aa4f5b 5575void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5576{
61aa4f5b 5577 u8 event;
712132eb 5578
61aa4f5b
MM		 5579 if (chan->mode != L2CAP_MODE_ERTM)
5580 return;
712132eb 5581
61aa4f5b 5582 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5583 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5584}
5585
d2a7ac5d
MM		 5586static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5587{
63838725
MM		 5588 int err = 0;
5589 /* Pass sequential frames to l2cap_reassemble_sdu()
5590 * until a gap is encountered.
5591 */
5592
5593 BT_DBG("chan %p", chan);
5594
5595 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5596 struct sk_buff *skb;
5597 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5598 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5599
5600 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5601
5602 if (!skb)
5603 break;
5604
5605 skb_unlink(skb, &chan->srej_q);
5606 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5607 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5608 if (err)
5609 break;
5610 }
5611
5612 if (skb_queue_empty(&chan->srej_q)) {
5613 chan->rx_state = L2CAP_RX_STATE_RECV;
5614 l2cap_send_ack(chan);
5615 }
5616
5617 return err;
d2a7ac5d
MM		 5618}
5619
5620static void l2cap_handle_srej(struct l2cap_chan *chan,
5621 struct l2cap_ctrl *control)
5622{
f80842a8
MM		 5623 struct sk_buff *skb;
5624
5625 BT_DBG("chan %p, control %p", chan, control);
5626
5627 if (control->reqseq == chan->next_tx_seq) {
5628 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5629 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5630 return;
5631 }
5632
5633 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5634
5635 if (skb == NULL) {
5636 BT_DBG("Seq %d not available for retransmission",
5637 control->reqseq);
5638 return;
5639 }
5640
5641 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5642 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5643 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5644 return;
5645 }
5646
5647 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5648
5649 if (control->poll) {
5650 l2cap_pass_to_tx(chan, control);
5651
5652 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5653 l2cap_retransmit(chan, control);
5654 l2cap_ertm_send(chan);
5655
5656 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5657 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5658 chan->srej_save_reqseq = control->reqseq;
5659 }
5660 } else {
5661 l2cap_pass_to_tx_fbit(chan, control);
5662
5663 if (control->final) {
5664 if (chan->srej_save_reqseq != control->reqseq ||
5665 !test_and_clear_bit(CONN_SREJ_ACT,
5666 &chan->conn_state))
5667 l2cap_retransmit(chan, control);
5668 } else {
5669 l2cap_retransmit(chan, control);
5670 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5671 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5672 chan->srej_save_reqseq = control->reqseq;
5673 }
5674 }
5675 }
d2a7ac5d
MM		 5676}
5677
5678static void l2cap_handle_rej(struct l2cap_chan *chan,
5679 struct l2cap_ctrl *control)
5680{
fcd289df
MM		 5681 struct sk_buff *skb;
5682
5683 BT_DBG("chan %p, control %p", chan, control);
5684
5685 if (control->reqseq == chan->next_tx_seq) {
5686 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5687 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5688 return;
5689 }
5690
5691 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5692
5693 if (chan->max_tx && skb &&
5694 bt_cb(skb)->control.retries >= chan->max_tx) {
5695 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5696 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5697 return;
5698 }
5699
5700 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5701
5702 l2cap_pass_to_tx(chan, control);
5703
5704 if (control->final) {
5705 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5706 l2cap_retransmit_all(chan, control);
5707 } else {
5708 l2cap_retransmit_all(chan, control);
5709 l2cap_ertm_send(chan);
5710 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5711 set_bit(CONN_REJ_ACT, &chan->conn_state);
5712 }
d2a7ac5d
MM		 5713}
5714
4b51dae9
MM		 5715static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5716{
5717 BT_DBG("chan %p, txseq %d", chan, txseq);
5718
5719 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5720 chan->expected_tx_seq);
5721
5722 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5723 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5724 chan->tx_win) {
4b51dae9
MM		 5725 /* See notes below regarding "double poll" and
5726 * invalid packets.
5727 */
5728 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5729 BT_DBG("Invalid/Ignore - after SREJ");
5730 return L2CAP_TXSEQ_INVALID_IGNORE;
5731 } else {
5732 BT_DBG("Invalid - in window after SREJ sent");
5733 return L2CAP_TXSEQ_INVALID;
5734 }
5735 }
5736
5737 if (chan->srej_list.head == txseq) {
5738 BT_DBG("Expected SREJ");
5739 return L2CAP_TXSEQ_EXPECTED_SREJ;
5740 }
5741
5742 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5743 BT_DBG("Duplicate SREJ - txseq already stored");
5744 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5745 }
5746
5747 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5748 BT_DBG("Unexpected SREJ - not requested");
5749 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5750 }
5751 }
5752
5753 if (chan->expected_tx_seq == txseq) {
5754 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5755 chan->tx_win) {
5756 BT_DBG("Invalid - txseq outside tx window");
5757 return L2CAP_TXSEQ_INVALID;
5758 } else {
5759 BT_DBG("Expected");
5760 return L2CAP_TXSEQ_EXPECTED;
5761 }
5762 }
5763
5764 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 5765 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 5766 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5767 return L2CAP_TXSEQ_DUPLICATE;
5768 }
5769
5770 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5771 /* A source of invalid packets is a "double poll" condition,
5772 * where delays cause us to send multiple poll packets. If
5773 * the remote stack receives and processes both polls,
5774 * sequence numbers can wrap around in such a way that a
5775 * resent frame has a sequence number that looks like new data
5776 * with a sequence gap. This would trigger an erroneous SREJ
5777 * request.
5778 *
5779 * Fortunately, this is impossible with a tx window that's
5780 * less than half of the maximum sequence number, which allows
5781 * invalid frames to be safely ignored.
5782 *
5783 * With tx window sizes greater than half of the tx window
5784 * maximum, the frame is invalid and cannot be ignored. This
5785 * causes a disconnect.
5786 */
5787
5788 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5789 BT_DBG("Invalid/Ignore - txseq outside tx window");
5790 return L2CAP_TXSEQ_INVALID_IGNORE;
5791 } else {
5792 BT_DBG("Invalid - txseq outside tx window");
5793 return L2CAP_TXSEQ_INVALID;
5794 }
5795 } else {
5796 BT_DBG("Unexpected - txseq indicates missing frames");
5797 return L2CAP_TXSEQ_UNEXPECTED;
5798 }
5799}
5800
d2a7ac5d
MM		 5801static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5802 struct l2cap_ctrl *control,
5803 struct sk_buff *skb, u8 event)
5804{
5805 int err = 0;
941247f9 5806 bool skb_in_use = false;
d2a7ac5d
MM		 5807
5808 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5809 event);
5810
5811 switch (event) {
5812 case L2CAP_EV_RECV_IFRAME:
5813 switch (l2cap_classify_txseq(chan, control->txseq)) {
5814 case L2CAP_TXSEQ_EXPECTED:
5815 l2cap_pass_to_tx(chan, control);
5816
5817 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5818 BT_DBG("Busy, discarding expected seq %d",
5819 control->txseq);
5820 break;
5821 }
5822
5823 chan->expected_tx_seq = __next_seq(chan,
5824 control->txseq);
5825
5826 chan->buffer_seq = chan->expected_tx_seq;
941247f9 5827 skb_in_use = true;
d2a7ac5d
MM		 5828
5829 err = l2cap_reassemble_sdu(chan, skb, control);
5830 if (err)
5831 break;
5832
5833 if (control->final) {
5834 if (!test_and_clear_bit(CONN_REJ_ACT,
5835 &chan->conn_state)) {
5836 control->final = 0;
5837 l2cap_retransmit_all(chan, control);
5838 l2cap_ertm_send(chan);
5839 }
5840 }
5841
5842 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5843 l2cap_send_ack(chan);
5844 break;
5845 case L2CAP_TXSEQ_UNEXPECTED:
5846 l2cap_pass_to_tx(chan, control);
5847
5848 /* Can't issue SREJ frames in the local busy state.
5849 * Drop this frame, it will be seen as missing
5850 * when local busy is exited.
5851 */
5852 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5853 BT_DBG("Busy, discarding unexpected seq %d",
5854 control->txseq);
5855 break;
5856 }
5857
5858 /* There was a gap in the sequence, so an SREJ
5859 * must be sent for each missing frame. The
5860 * current frame is stored for later use.
5861 */
5862 skb_queue_tail(&chan->srej_q, skb);
941247f9 5863 skb_in_use = true;
d2a7ac5d
MM		 5864 BT_DBG("Queued %p (queue len %d)", skb,
5865 skb_queue_len(&chan->srej_q));
5866
5867 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5868 l2cap_seq_list_clear(&chan->srej_list);
5869 l2cap_send_srej(chan, control->txseq);
5870
5871 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5872 break;
5873 case L2CAP_TXSEQ_DUPLICATE:
5874 l2cap_pass_to_tx(chan, control);
5875 break;
5876 case L2CAP_TXSEQ_INVALID_IGNORE:
5877 break;
5878 case L2CAP_TXSEQ_INVALID:
5879 default:
5e4e3972 5880 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5881 break;
5882 }
5883 break;
5884 case L2CAP_EV_RECV_RR:
5885 l2cap_pass_to_tx(chan, control);
5886 if (control->final) {
5887 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5888
e6a3ee6e
MM		 5889 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5890 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 5891 control->final = 0;
5892 l2cap_retransmit_all(chan, control);
5893 }
5894
5895 l2cap_ertm_send(chan);
5896 } else if (control->poll) {
5897 l2cap_send_i_or_rr_or_rnr(chan);
5898 } else {
5899 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5900 &chan->conn_state) &&
5901 chan->unacked_frames)
5902 __set_retrans_timer(chan);
5903
5904 l2cap_ertm_send(chan);
5905 }
5906 break;
5907 case L2CAP_EV_RECV_RNR:
5908 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5909 l2cap_pass_to_tx(chan, control);
5910 if (control && control->poll) {
5911 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5912 l2cap_send_rr_or_rnr(chan, 0);
5913 }
5914 __clear_retrans_timer(chan);
5915 l2cap_seq_list_clear(&chan->retrans_list);
5916 break;
5917 case L2CAP_EV_RECV_REJ:
5918 l2cap_handle_rej(chan, control);
5919 break;
5920 case L2CAP_EV_RECV_SREJ:
5921 l2cap_handle_srej(chan, control);
5922 break;
5923 default:
5924 break;
5925 }
5926
5927 if (skb && !skb_in_use) {
5928 BT_DBG("Freeing %p", skb);
5929 kfree_skb(skb);
5930 }
5931
5932 return err;
5933}
5934
5935static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5936 struct l2cap_ctrl *control,
5937 struct sk_buff *skb, u8 event)
5938{
5939 int err = 0;
5940 u16 txseq = control->txseq;
941247f9 5941 bool skb_in_use = false;
d2a7ac5d
MM		 5942
5943 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5944 event);
5945
5946 switch (event) {
5947 case L2CAP_EV_RECV_IFRAME:
5948 switch (l2cap_classify_txseq(chan, txseq)) {
5949 case L2CAP_TXSEQ_EXPECTED:
5950 /* Keep frame for reassembly later */
5951 l2cap_pass_to_tx(chan, control);
5952 skb_queue_tail(&chan->srej_q, skb);
941247f9 5953 skb_in_use = true;
d2a7ac5d
MM		 5954 BT_DBG("Queued %p (queue len %d)", skb,
5955 skb_queue_len(&chan->srej_q));
5956
5957 chan->expected_tx_seq = __next_seq(chan, txseq);
5958 break;
5959 case L2CAP_TXSEQ_EXPECTED_SREJ:
5960 l2cap_seq_list_pop(&chan->srej_list);
5961
5962 l2cap_pass_to_tx(chan, control);
5963 skb_queue_tail(&chan->srej_q, skb);
941247f9 5964 skb_in_use = true;
d2a7ac5d
MM		 5965 BT_DBG("Queued %p (queue len %d)", skb,
5966 skb_queue_len(&chan->srej_q));
5967
5968 err = l2cap_rx_queued_iframes(chan);
5969 if (err)
5970 break;
5971
5972 break;
5973 case L2CAP_TXSEQ_UNEXPECTED:
5974 /* Got a frame that can't be reassembled yet.
5975 * Save it for later, and send SREJs to cover
5976 * the missing frames.
5977 */
5978 skb_queue_tail(&chan->srej_q, skb);
941247f9 5979 skb_in_use = true;
d2a7ac5d
MM		 5980 BT_DBG("Queued %p (queue len %d)", skb,
5981 skb_queue_len(&chan->srej_q));
5982
5983 l2cap_pass_to_tx(chan, control);
5984 l2cap_send_srej(chan, control->txseq);
5985 break;
5986 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5987 /* This frame was requested with an SREJ, but
5988 * some expected retransmitted frames are
5989 * missing. Request retransmission of missing
5990 * SREJ'd frames.
5991 */
5992 skb_queue_tail(&chan->srej_q, skb);
941247f9 5993 skb_in_use = true;
d2a7ac5d
MM		 5994 BT_DBG("Queued %p (queue len %d)", skb,
5995 skb_queue_len(&chan->srej_q));
5996
5997 l2cap_pass_to_tx(chan, control);
5998 l2cap_send_srej_list(chan, control->txseq);
5999 break;
6000 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6001 /* We've already queued this frame. Drop this copy. */
6002 l2cap_pass_to_tx(chan, control);
6003 break;
6004 case L2CAP_TXSEQ_DUPLICATE:
6005 /* Expecting a later sequence number, so this frame
6006 * was already received. Ignore it completely.
6007 */
6008 break;
6009 case L2CAP_TXSEQ_INVALID_IGNORE:
6010 break;
6011 case L2CAP_TXSEQ_INVALID:
6012 default:
5e4e3972 6013 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6014 break;
6015 }
6016 break;
6017 case L2CAP_EV_RECV_RR:
6018 l2cap_pass_to_tx(chan, control);
6019 if (control->final) {
6020 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6021
6022 if (!test_and_clear_bit(CONN_REJ_ACT,
6023 &chan->conn_state)) {
6024 control->final = 0;
6025 l2cap_retransmit_all(chan, control);
6026 }
6027
6028 l2cap_ertm_send(chan);
6029 } else if (control->poll) {
6030 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6031 &chan->conn_state) &&
6032 chan->unacked_frames) {
6033 __set_retrans_timer(chan);
6034 }
6035
6036 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6037 l2cap_send_srej_tail(chan);
6038 } else {
6039 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6040 &chan->conn_state) &&
6041 chan->unacked_frames)
6042 __set_retrans_timer(chan);
6043
6044 l2cap_send_ack(chan);
6045 }
6046 break;
6047 case L2CAP_EV_RECV_RNR:
6048 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6049 l2cap_pass_to_tx(chan, control);
6050 if (control->poll) {
6051 l2cap_send_srej_tail(chan);
6052 } else {
6053 struct l2cap_ctrl rr_control;
6054 memset(&rr_control, 0, sizeof(rr_control));
6055 rr_control.sframe = 1;
6056 rr_control.super = L2CAP_SUPER_RR;
6057 rr_control.reqseq = chan->buffer_seq;
6058 l2cap_send_sframe(chan, &rr_control);
6059 }
6060
6061 break;
6062 case L2CAP_EV_RECV_REJ:
6063 l2cap_handle_rej(chan, control);
6064 break;
6065 case L2CAP_EV_RECV_SREJ:
6066 l2cap_handle_srej(chan, control);
6067 break;
6068 }
6069
6070 if (skb && !skb_in_use) {
6071 BT_DBG("Freeing %p", skb);
6072 kfree_skb(skb);
6073 }
6074
6075 return err;
6076}
6077
32b32735
MM		 6078static int l2cap_finish_move(struct l2cap_chan *chan)
6079{
6080 BT_DBG("chan %p", chan);
6081
6082 chan->rx_state = L2CAP_RX_STATE_RECV;
6083
6084 if (chan->hs_hcon)
6085 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6086 else
6087 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6088
6089 return l2cap_resegment(chan);
6090}
6091
6092static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6093 struct l2cap_ctrl *control,
6094 struct sk_buff *skb, u8 event)
6095{
6096 int err;
6097
6098 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6099 event);
6100
6101 if (!control->poll)
6102 return -EPROTO;
6103
6104 l2cap_process_reqseq(chan, control->reqseq);
6105
6106 if (!skb_queue_empty(&chan->tx_q))
6107 chan->tx_send_head = skb_peek(&chan->tx_q);
6108 else
6109 chan->tx_send_head = NULL;
6110
6111 /* Rewind next_tx_seq to the point expected
6112 * by the receiver.
6113 */
6114 chan->next_tx_seq = control->reqseq;
6115 chan->unacked_frames = 0;
6116
6117 err = l2cap_finish_move(chan);
6118 if (err)
6119 return err;
6120
6121 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6122 l2cap_send_i_or_rr_or_rnr(chan);
6123
6124 if (event == L2CAP_EV_RECV_IFRAME)
6125 return -EPROTO;
6126
6127 return l2cap_rx_state_recv(chan, control, NULL, event);
6128}
6129
6130static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6131 struct l2cap_ctrl *control,
6132 struct sk_buff *skb, u8 event)
6133{
6134 int err;
6135
6136 if (!control->final)
6137 return -EPROTO;
6138
6139 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6140
6141 chan->rx_state = L2CAP_RX_STATE_RECV;
6142 l2cap_process_reqseq(chan, control->reqseq);
6143
6144 if (!skb_queue_empty(&chan->tx_q))
6145 chan->tx_send_head = skb_peek(&chan->tx_q);
6146 else
6147 chan->tx_send_head = NULL;
6148
6149 /* Rewind next_tx_seq to the point expected
6150 * by the receiver.
6151 */
6152 chan->next_tx_seq = control->reqseq;
6153 chan->unacked_frames = 0;
6154
6155 if (chan->hs_hcon)
6156 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6157 else
6158 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6159
6160 err = l2cap_resegment(chan);
6161
6162 if (!err)
6163 err = l2cap_rx_state_recv(chan, control, skb, event);
6164
6165 return err;
6166}
6167
d2a7ac5d
MM		 6168static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6169{
6170 /* Make sure reqseq is for a packet that has been sent but not acked */
6171 u16 unacked;
6172
6173 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6174 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6175}
6176
cec8ab6e
MM		 6177static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6178 struct sk_buff *skb, u8 event)
218bb9df 6179{
d2a7ac5d
MM		 6180 int err = 0;
6181
6182 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6183 control, skb, event, chan->rx_state);
6184
6185 if (__valid_reqseq(chan, control->reqseq)) {
6186 switch (chan->rx_state) {
6187 case L2CAP_RX_STATE_RECV:
6188 err = l2cap_rx_state_recv(chan, control, skb, event);
6189 break;
6190 case L2CAP_RX_STATE_SREJ_SENT:
6191 err = l2cap_rx_state_srej_sent(chan, control, skb,
6192 event);
6193 break;
32b32735
MM		 6194 case L2CAP_RX_STATE_WAIT_P:
6195 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6196 break;
6197 case L2CAP_RX_STATE_WAIT_F:
6198 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6199 break;
d2a7ac5d
MM		 6200 default:
6201 /* shut it down */
6202 break;
6203 }
6204 } else {
6205 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6206 control->reqseq, chan->next_tx_seq,
6207 chan->expected_ack_seq);
5e4e3972 6208 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6209 }
6210
6211 return err;
cec8ab6e
MM		 6212}
6213
6214static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6215 struct sk_buff *skb)
6216{
4b51dae9
MM		 6217 int err = 0;
6218
6219 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6220 chan->rx_state);
6221
6222 if (l2cap_classify_txseq(chan, control->txseq) ==
6223 L2CAP_TXSEQ_EXPECTED) {
6224 l2cap_pass_to_tx(chan, control);
6225
6226 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6227 __next_seq(chan, chan->buffer_seq));
6228
6229 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6230
6231 l2cap_reassemble_sdu(chan, skb, control);
6232 } else {
6233 if (chan->sdu) {
6234 kfree_skb(chan->sdu);
6235 chan->sdu = NULL;
6236 }
6237 chan->sdu_last_frag = NULL;
6238 chan->sdu_len = 0;
6239
6240 if (skb) {
6241 BT_DBG("Freeing %p", skb);
6242 kfree_skb(skb);
6243 }
6244 }
6245
6246 chan->last_acked_seq = control->txseq;
6247 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6248
6249 return err;
cec8ab6e
MM		 6250}
6251
6252static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6253{
6254 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6255 u16 len;
6256 u8 event;
218bb9df 6257
b76bbd66
MM		 6258 __unpack_control(chan, skb);
6259
218bb9df
GP		 6260 len = skb->len;
6261
6262 /*
6263 * We can just drop the corrupted I-frame here.
6264 * Receiver will miss it and start proper recovery
cec8ab6e 6265 * procedures and ask for retransmission.
218bb9df 6266 */
47d1ec61 6267 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6268 goto drop;
6269
cec8ab6e 6270 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6271 len -= L2CAP_SDULEN_SIZE;
218bb9df 6272
47d1ec61 6273 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6274 len -= L2CAP_FCS_SIZE;
218bb9df 6275
47d1ec61 6276 if (len > chan->mps) {
5e4e3972 6277 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6278 goto drop;
6279 }
6280
cec8ab6e
MM		 6281 if (!control->sframe) {
6282 int err;
218bb9df 6283
cec8ab6e
MM		 6284 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6285 control->sar, control->reqseq, control->final,
6286 control->txseq);
218bb9df 6287
cec8ab6e
MM		 6288 /* Validate F-bit - F=0 always valid, F=1 only
6289 * valid in TX WAIT_F
6290 */
6291 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6292 goto drop;
cec8ab6e
MM		 6293
6294 if (chan->mode != L2CAP_MODE_STREAMING) {
6295 event = L2CAP_EV_RECV_IFRAME;
6296 err = l2cap_rx(chan, control, skb, event);
6297 } else {
6298 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6299 }
6300
cec8ab6e 6301 if (err)
5e4e3972 6302 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6303 } else {
cec8ab6e
MM		 6304 const u8 rx_func_to_event[4] = {
6305 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6306 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6307 };
6308
6309 /* Only I-frames are expected in streaming mode */
6310 if (chan->mode == L2CAP_MODE_STREAMING)
6311 goto drop;
6312
6313 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6314 control->reqseq, control->final, control->poll,
6315 control->super);
6316
218bb9df 6317 if (len != 0) {
1bb166e6 6318 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6319 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6320 goto drop;
6321 }
6322
cec8ab6e
MM		 6323 /* Validate F and P bits */
6324 if (control->final && (control->poll ||
6325 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6326 goto drop;
6327
6328 event = rx_func_to_event[control->super];
6329 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6330 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6331 }
6332
6333 return 0;
6334
6335drop:
6336 kfree_skb(skb);
6337 return 0;
6338}
6339
13ca56e0
AE		 6340static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6341 struct sk_buff *skb)
1da177e4 6342{
48454079 6343 struct l2cap_chan *chan;
1da177e4 6344
baa7e1fa 6345 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6346 if (!chan) {
97e8e89d
AE		 6347 if (cid == L2CAP_CID_A2MP) {
6348 chan = a2mp_channel_create(conn, skb);
6349 if (!chan) {
6350 kfree_skb(skb);
13ca56e0 6351 return;
97e8e89d
AE		 6352 }
6353
6354 l2cap_chan_lock(chan);
6355 } else {
6356 BT_DBG("unknown cid 0x%4.4x", cid);
6357 /* Drop packet and return */
6358 kfree_skb(skb);
13ca56e0 6359 return;
97e8e89d 6360 }
1da177e4
LT		 6361 }
6362
49208c9c 6363 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6364
89bc500e 6365 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6366 goto drop;
6367
0c1bc5c6 6368 switch (chan->mode) {
1c2acffb
GP		 6369 case L2CAP_MODE_BASIC:
6370 /* If socket recv buffers overflows we drop data here
6371 * which is *bad* because L2CAP has to be reliable.
6372 * But we don't have any other choice. L2CAP doesn't
6373 * provide flow control mechanism. */
1da177e4 6374
0c1bc5c6 6375 if (chan->imtu < skb->len)
1c2acffb 6376 goto drop;
1da177e4 6377
80b98027 6378 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6379 goto done;
6380 break;
6381
6382 case L2CAP_MODE_ERTM:
6840ed07 6383 case L2CAP_MODE_STREAMING:
cec8ab6e 6384 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6385 goto done;
6386
1c2acffb 6387 default:
0c1bc5c6 6388 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6389 break;
6390 }
1da177e4
LT		 6391
6392drop:
6393 kfree_skb(skb);
6394
6395done:
6be36555 6396 l2cap_chan_unlock(chan);
1da177e4
LT		 6397}
6398
84104b24
AE		 6399static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6400 struct sk_buff *skb)
1da177e4 6401{
ae4fd2d3 6402 struct hci_conn *hcon = conn->hcon;
23691d75 6403 struct l2cap_chan *chan;
1da177e4 6404
ae4fd2d3
MH		 6405 if (hcon->type != ACL_LINK)
6406 goto drop;
6407
06ae3314 6408 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst);
23691d75 6409 if (!chan)
1da177e4
LT		 6410 goto drop;
6411
5b4cedaa 6412 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6413
89bc500e 6414 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6415 goto drop;
6416
e13e21dc 6417 if (chan->imtu < skb->len)
1da177e4
LT		 6418 goto drop;
6419
2edf870d 6420 /* Store remote BD_ADDR and PSM for msg_name */
06ae3314 6421 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
2edf870d
MH		 6422 bt_cb(skb)->psm = psm;
6423
80b98027 6424 if (!chan->ops->recv(chan, skb))
84104b24 6425 return;
1da177e4
LT		 6426
6427drop:
6428 kfree_skb(skb);
1da177e4
LT		 6429}
6430
72f78356 6431static void l2cap_att_channel(struct l2cap_conn *conn,
6810fca7 6432 struct sk_buff *skb)
9f69bda6 6433{
b99707d7 6434 struct hci_conn *hcon = conn->hcon;
23691d75 6435 struct l2cap_chan *chan;
9f69bda6 6436
b99707d7
MH		 6437 if (hcon->type != LE_LINK)
6438 goto drop;
6439
af1c0134 6440 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
06ae3314 6441 &hcon->src, &hcon->dst);
23691d75 6442 if (!chan)
9f69bda6
GP		 6443 goto drop;
6444
5b4cedaa 6445 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6446
cc8dba2b
MH		 6447 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type))
6448 goto drop;
6449
e13e21dc 6450 if (chan->imtu < skb->len)
9f69bda6
GP		 6451 goto drop;
6452
80b98027 6453 if (!chan->ops->recv(chan, skb))
6810fca7 6454 return;
9f69bda6
GP		 6455
6456drop:
6457 kfree_skb(skb);
9f69bda6
GP		 6458}
6459
1da177e4
LT		 6460static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6461{
6462 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 6463 u16 cid, len;
6464 __le16 psm;
1da177e4
LT		 6465
6466 skb_pull(skb, L2CAP_HDR_SIZE);
6467 cid = __le16_to_cpu(lh->cid);
6468 len = __le16_to_cpu(lh->len);
6469
1c2acffb
GP		 6470 if (len != skb->len) {
6471 kfree_skb(skb);
6472 return;
6473 }
6474
1da177e4
LT		 6475 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6476
6477 switch (cid) {
8db4dc46 6478 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6479 l2cap_sig_channel(conn, skb);
6480 break;
6481
8db4dc46 6482 case L2CAP_CID_CONN_LESS:
097db76c 6483 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6484 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6485 l2cap_conless_channel(conn, psm, skb);
6486 break;
6487
073d1cf3 6488 case L2CAP_CID_ATT:
72f78356 6489 l2cap_att_channel(conn, skb);
9f69bda6
GP		 6490 break;
6491
a2877629
MH		 6492 case L2CAP_CID_LE_SIGNALING:
6493 l2cap_le_sig_channel(conn, skb);
6494 break;
6495
b501d6a1
AB		 6496 case L2CAP_CID_SMP:
6497 if (smp_sig_channel(conn, skb))
6498 l2cap_conn_del(conn->hcon, EACCES);
6499 break;
6500
1da177e4
LT		 6501 default:
6502 l2cap_data_channel(conn, cid, skb);
6503 break;
6504 }
6505}
6506
6507/* ---- L2CAP interface with lower layer (HCI) ---- */
6508
686ebf28 6509int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 6510{
6511 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 6512 struct l2cap_chan *c;
1da177e4 6513
6ed93dc6 6514 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 6515
6516 /* Find listening sockets and check their link_mode */
23691d75
GP		 6517 read_lock(&chan_list_lock);
6518 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 6519 if (c->state != BT_LISTEN)
1da177e4
LT		 6520 continue;
6521
7eafc59e 6522 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 6523 lm1 |= HCI_LM_ACCEPT;
43bd0f32 6524 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 6525 lm1 |= HCI_LM_MASTER;
1da177e4 6526 exact++;
7eafc59e 6527 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 6528 lm2 |= HCI_LM_ACCEPT;
43bd0f32 6529 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 6530 lm2 |= HCI_LM_MASTER;
6531 }
1da177e4 6532 }
23691d75 6533 read_unlock(&chan_list_lock);
1da177e4
LT		 6534
6535 return exact ? lm1 : lm2;
6536}
6537
9e664631 6538void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 6539{
0139418c
MH		 6540 struct l2cap_conn *conn;
6541
6ed93dc6 6542 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 6543
1da177e4 6544 if (!status) {
baf43251 6545 conn = l2cap_conn_add(hcon);
1da177e4
LT		 6546 if (conn)
6547 l2cap_conn_ready(conn);
ba6fc317 6548 } else {
e175072f 6549 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 6550 }
1da177e4
LT		 6551}
6552
686ebf28 6553int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 6554{
6555 struct l2cap_conn *conn = hcon->l2cap_data;
6556
6557 BT_DBG("hcon %p", hcon);
6558
686ebf28 6559 if (!conn)
9f5a0d7b 6560 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 6561 return conn->disc_reason;
6562}
6563
9e664631 6564void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 6565{
6566 BT_DBG("hcon %p reason %d", hcon, reason);
6567
e175072f 6568 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 6569}
6570
4343478f 6571static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 6572{
715ec005 6573 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 6574 return;
6575
f62e4323 6576 if (encrypt == 0x00) {
4343478f 6577 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 6578 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 6579 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 6580 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 6581 } else {
4343478f 6582 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 6583 __clear_chan_timer(chan);
f62e4323
MH		 6584 }
6585}
6586
686ebf28 6587int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 6588{
0139418c 6589 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 6590 struct l2cap_chan *chan;
1da177e4 6591
0139418c 6592 if (!conn)
1da177e4 6593 return 0;
0139418c 6594
89d8b407 6595 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 6596
160dc6ac 6597 if (hcon->type == LE_LINK) {
35d4adcc
HG		 6598 if (!status && encrypt)
6599 smp_distribute_keys(conn, 0);
17cd3f37 6600 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 6601 }
6602
3df91ea2 6603 mutex_lock(&conn->chan_lock);
1da177e4 6604
3df91ea2 6605 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 6606 l2cap_chan_lock(chan);
1da177e4 6607
89d8b407
AE		 6608 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6609 state_to_string(chan->state));
f1cb9af5 6610
78eb2f98
AE		 6611 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6612 l2cap_chan_unlock(chan);
6613 continue;
6614 }
6615
073d1cf3 6616 if (chan->scid == L2CAP_CID_ATT) {
f1cb9af5
VCG		 6617 if (!status && encrypt) {
6618 chan->sec_level = hcon->sec_level;
cf4cd009 6619 l2cap_chan_ready(chan);
f1cb9af5
VCG		 6620 }
6621
6be36555 6622 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 6623 continue;
6624 }
6625
96eff46e 6626 if (!__l2cap_no_conn_pending(chan)) {
6be36555 6627 l2cap_chan_unlock(chan);
6a8d3010
MH		 6628 continue;
6629 }
6630
89bc500e 6631 if (!status && (chan->state == BT_CONNECTED ||
2d792818 6632 chan->state == BT_CONFIG)) {
d97c899b 6633 chan->ops->resume(chan);
4343478f 6634 l2cap_check_encryption(chan, encrypt);
6be36555 6635 l2cap_chan_unlock(chan);
9719f8af
MH		 6636 continue;
6637 }
6638
89bc500e 6639 if (chan->state == BT_CONNECT) {
b1235d79 6640 if (!status) {
93c3e8f5 6641 l2cap_start_connection(chan);
b1235d79 6642 } else {
ba13ccd9 6643 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 6644 }
89bc500e 6645 } else if (chan->state == BT_CONNECT2) {
6be36555 6646 struct sock *sk = chan->sk;
b1235d79 6647 struct l2cap_conn_rsp rsp;
df3c3931 6648 __u16 res, stat;
1da177e4 6649
6be36555
AE		 6650 lock_sock(sk);
6651
b1235d79 6652 if (!status) {
bdc25783 6653 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 6654 res = L2CAP_CR_PEND;
6655 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 6656 chan->ops->defer(chan);
df3c3931 6657 } else {
0e587be7 6658 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 6659 res = L2CAP_CR_SUCCESS;
6660 stat = L2CAP_CS_NO_INFO;
6661 }
b1235d79 6662 } else {
0e587be7 6663 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 6664 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 6665 res = L2CAP_CR_SEC_BLOCK;
6666 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 6667 }
6668
6be36555
AE		 6669 release_sock(sk);
6670
fe4128e0
GP		 6671 rsp.scid = cpu_to_le16(chan->dcid);
6672 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 6673 rsp.result = cpu_to_le16(res);
6674 rsp.status = cpu_to_le16(stat);
fc7f8a7e 6675 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 6676 sizeof(rsp), &rsp);
2d369359
MM		 6677
6678 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6679 res == L2CAP_CR_SUCCESS) {
6680 char buf[128];
6681 set_bit(CONF_REQ_SENT, &chan->conf_state);
6682 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6683 L2CAP_CONF_REQ,
6684 l2cap_build_conf_req(chan, buf),
6685 buf);
6686 chan->num_conf_req++;
6687 }
b1235d79 6688 }
1da177e4 6689
6be36555 6690 l2cap_chan_unlock(chan);
1da177e4
LT		 6691 }
6692
3df91ea2 6693 mutex_unlock(&conn->chan_lock);
b1235d79 6694
1da177e4
LT		 6695 return 0;
6696}
6697
686ebf28 6698int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 6699{
6700 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 6701 struct l2cap_hdr *hdr;
6702 int len;
1da177e4 6703
1d13a254
AE		 6704 /* For AMP controller do not create l2cap conn */
6705 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6706 goto drop;
1da177e4 6707
5a08ecce 6708 if (!conn)
baf43251 6709 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 6710
6711 if (!conn)
1da177e4
LT		 6712 goto drop;
6713
6714 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6715
d73a0988
AE		 6716 switch (flags) {
6717 case ACL_START:
6718 case ACL_START_NO_FLUSH:
6719 case ACL_COMPLETE:
1da177e4
LT		 6720 if (conn->rx_len) {
6721 BT_ERR("Unexpected start frame (len %d)", skb->len);
6722 kfree_skb(conn->rx_skb);
6723 conn->rx_skb = NULL;
6724 conn->rx_len = 0;
6725 l2cap_conn_unreliable(conn, ECOMM);
6726 }
6727
aae7fe22
AE		 6728 /* Start fragment always begin with Basic L2CAP header */
6729 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 6730 BT_ERR("Frame is too short (len %d)", skb->len);
6731 l2cap_conn_unreliable(conn, ECOMM);
6732 goto drop;
6733 }
6734
6735 hdr = (struct l2cap_hdr *) skb->data;
6736 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6737
6738 if (len == skb->len) {
6739 /* Complete frame received */
6740 l2cap_recv_frame(conn, skb);
6741 return 0;
6742 }
6743
6744 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6745
6746 if (skb->len > len) {
6747 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 6748 skb->len, len);
1da177e4
LT		 6749 l2cap_conn_unreliable(conn, ECOMM);
6750 goto drop;
6751 }
6752
6753 /* Allocate skb for the complete frame (with header) */
8bcde1f2 6754 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 6755 if (!conn->rx_skb)
1da177e4
LT		 6756 goto drop;
6757
d626f62b 6758 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6759 skb->len);
1da177e4 6760 conn->rx_len = len - skb->len;
d73a0988
AE		 6761 break;
6762
6763 case ACL_CONT:
1da177e4
LT		 6764 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6765
6766 if (!conn->rx_len) {
6767 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6768 l2cap_conn_unreliable(conn, ECOMM);
6769 goto drop;
6770 }
6771
6772 if (skb->len > conn->rx_len) {
6773 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 6774 skb->len, conn->rx_len);
1da177e4
LT		 6775 kfree_skb(conn->rx_skb);
6776 conn->rx_skb = NULL;
6777 conn->rx_len = 0;
6778 l2cap_conn_unreliable(conn, ECOMM);
6779 goto drop;
6780 }
6781
d626f62b 6782 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6783 skb->len);
1da177e4
LT		 6784 conn->rx_len -= skb->len;
6785
6786 if (!conn->rx_len) {
c4e5bafa
JH		 6787 /* Complete frame received. l2cap_recv_frame
6788 * takes ownership of the skb so set the global
6789 * rx_skb pointer to NULL first.
6790 */
6791 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 6792 conn->rx_skb = NULL;
c4e5bafa 6793 l2cap_recv_frame(conn, rx_skb);
1da177e4 6794 }
d73a0988 6795 break;
1da177e4
LT		 6796 }
6797
6798drop:
6799 kfree_skb(skb);
6800 return 0;
6801}
6802
aef7d97c 6803static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 6804{
23691d75 6805 struct l2cap_chan *c;
1da177e4 6806
333055f2 6807 read_lock(&chan_list_lock);
1da177e4 6808
23691d75 6809 list_for_each_entry(c, &chan_list, global_l) {
fcb73338 6810 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7eafc59e 6811 &c->src, &c->dst,
fcb73338
AE		 6812 c->state, __le16_to_cpu(c->psm),
6813 c->scid, c->dcid, c->imtu, c->omtu,
6814 c->sec_level, c->mode);
61e1b4b7 6815 }
1da177e4 6816
333055f2 6817 read_unlock(&chan_list_lock);
1da177e4 6818
aef7d97c 6819 return 0;
1da177e4
LT		 6820}
6821
aef7d97c
MH		 6822static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6823{
6824 return single_open(file, l2cap_debugfs_show, inode->i_private);
6825}
6826
6827static const struct file_operations l2cap_debugfs_fops = {
6828 .open = l2cap_debugfs_open,
6829 .read = seq_read,
6830 .llseek = seq_lseek,
6831 .release = single_release,
6832};
6833
6834static struct dentry *l2cap_debugfs;
1da177e4 6835
64274518 6836int __init l2cap_init(void)
1da177e4
LT		 6837{
6838 int err;
be9d1227 6839
bb58f747 6840 err = l2cap_init_sockets();
1da177e4
LT		 6841 if (err < 0)
6842 return err;
6843
1120e4bf
MH		 6844 if (IS_ERR_OR_NULL(bt_debugfs))
6845 return 0;
6846
6847 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6848 NULL, &l2cap_debugfs_fops);
1da177e4 6849
1da177e4 6850 return 0;
1da177e4
LT		 6851}
6852
64274518 6853void l2cap_exit(void)
1da177e4 6854{
aef7d97c 6855 debugfs_remove(l2cap_debugfs);
bb58f747 6856 l2cap_cleanup_sockets();
1da177e4
LT		 6857}
6858
d1c4a17d
GP		 6859module_param(disable_ertm, bool, 0644);
6860MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
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