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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / l2cap_core.c
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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>
b501d6a1 39#include <net/bluetooth/smp.h>
97e8e89d 40#include <net/bluetooth/a2mp.h>
1da177e4 41
d1de6d46 42bool disable_ertm;
f0709e03 43
47ec1dcd 44static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
50a147cd 45static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
1da177e4 46
b5ad8b7f
JB		 47static LIST_HEAD(chan_list);
48static DEFINE_RWLOCK(chan_list_lock);
1da177e4 49
1da177e4
LT		 50static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
51 u8 code, u8 ident, u16 dlen, void *data);
4519de9a
GP		 52static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
53 void *data);
710f9b0a 54static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
4519de9a 55static void l2cap_send_disconn_req(struct l2cap_conn *conn,
c5daa683 56 struct l2cap_chan *chan, int err);
1da177e4 57
d660366d 58static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
608bcc6d
MM		 59 struct sk_buff_head *skbs, u8 event);
60
0139418c 61/* ---- L2CAP channels ---- */
71ba0e56 62
baa7e1fa 63static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
0139418c 64{
3df91ea2 65 struct l2cap_chan *c;
3d57dc68 66
3df91ea2
AE		 67 list_for_each_entry(c, &conn->chan_l, list) {
68 if (c->dcid == cid)
69 return c;
0139418c 70 }
3df91ea2 71 return NULL;
0139418c
MH		 72}
73
baa7e1fa 74static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 75{
3df91ea2 76 struct l2cap_chan *c;
3d57dc68 77
3df91ea2
AE		 78 list_for_each_entry(c, &conn->chan_l, list) {
79 if (c->scid == cid)
80 return c;
0139418c 81 }
3df91ea2 82 return NULL;
0139418c
MH		 83}
84
85/* Find channel with given SCID.
ef191ade 86 * Returns locked channel. */
baa7e1fa 87static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 88{
48454079 89 struct l2cap_chan *c;
baa7e1fa 90
3df91ea2 91 mutex_lock(&conn->chan_lock);
baa7e1fa 92 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 93 if (c)
94 l2cap_chan_lock(c);
3df91ea2
AE		 95 mutex_unlock(&conn->chan_lock);
96
48454079 97 return c;
0139418c
MH		 98}
99
baa7e1fa 100static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 101{
3df91ea2 102 struct l2cap_chan *c;
3d57dc68 103
3df91ea2
AE		 104 list_for_each_entry(c, &conn->chan_l, list) {
105 if (c->ident == ident)
106 return c;
0139418c 107 }
3df91ea2 108 return NULL;
0139418c
MH		 109}
110
23691d75 111static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 112{
23691d75 113 struct l2cap_chan *c;
9e4425ff 114
23691d75
GP		 115 list_for_each_entry(c, &chan_list, global_l) {
116 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
250938cb 117 return c;
9e4425ff 118 }
250938cb 119 return NULL;
9e4425ff
GP		 120}
121
122int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
123{
73b2ec18
GP		 124 int err;
125
333055f2 126 write_lock(&chan_list_lock);
9e4425ff 127
23691d75 128 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 129 err = -EADDRINUSE;
130 goto done;
9e4425ff
GP		 131 }
132
73b2ec18
GP		 133 if (psm) {
134 chan->psm = psm;
135 chan->sport = psm;
136 err = 0;
137 } else {
138 u16 p;
139
140 err = -EINVAL;
141 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 142 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 143 chan->psm = cpu_to_le16(p);
144 chan->sport = cpu_to_le16(p);
145 err = 0;
146 break;
147 }
148 }
9e4425ff 149
73b2ec18 150done:
333055f2 151 write_unlock(&chan_list_lock);
73b2ec18 152 return err;
9e4425ff
GP		 153}
154
155int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
156{
333055f2 157 write_lock(&chan_list_lock);
9e4425ff
GP		 158
159 chan->scid = scid;
160
333055f2 161 write_unlock(&chan_list_lock);
9e4425ff
GP		 162
163 return 0;
164}
165
baa7e1fa 166static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 167{
8db4dc46 168 u16 cid = L2CAP_CID_DYN_START;
0139418c 169
8db4dc46 170 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 171 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 172 return cid;
173 }
174
175 return 0;
176}
177
0e587be7 178static void __l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 179{
42d2d87c 180 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
badaaa00
GP		 181 state_to_string(state));
182
89bc500e 183 chan->state = state;
80b98027 184 chan->ops->state_change(chan, state);
89bc500e
GP		 185}
186
0e587be7
AE		 187static void l2cap_state_change(struct l2cap_chan *chan, int state)
188{
189 struct sock *sk = chan->sk;
190
191 lock_sock(sk);
192 __l2cap_state_change(chan, state);
193 release_sock(sk);
194}
195
2e0052e4
AE		 196static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err)
197{
198 struct sock *sk = chan->sk;
199
200 sk->sk_err = err;
201}
202
203static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
204{
205 struct sock *sk = chan->sk;
206
207 lock_sock(sk);
208 __l2cap_chan_set_err(chan, err);
209 release_sock(sk);
210}
211
4239d16f
MM		 212static void __set_retrans_timer(struct l2cap_chan *chan)
213{
214 if (!delayed_work_pending(&chan->monitor_timer) &&
215 chan->retrans_timeout) {
216 l2cap_set_timer(chan, &chan->retrans_timer,
217 msecs_to_jiffies(chan->retrans_timeout));
218 }
219}
220
221static void __set_monitor_timer(struct l2cap_chan *chan)
222{
223 __clear_retrans_timer(chan);
224 if (chan->monitor_timeout) {
225 l2cap_set_timer(chan, &chan->monitor_timer,
226 msecs_to_jiffies(chan->monitor_timeout));
227 }
228}
229
608bcc6d
MM		 230static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
231 u16 seq)
232{
233 struct sk_buff *skb;
234
235 skb_queue_walk(head, skb) {
236 if (bt_cb(skb)->control.txseq == seq)
237 return skb;
238 }
239
240 return NULL;
241}
242
3c588192
MM		 243/* ---- L2CAP sequence number lists ---- */
244
245/* For ERTM, ordered lists of sequence numbers must be tracked for
246 * SREJ requests that are received and for frames that are to be
247 * retransmitted. These seq_list functions implement a singly-linked
248 * list in an array, where membership in the list can also be checked
249 * in constant time. Items can also be added to the tail of the list
250 * and removed from the head in constant time, without further memory
251 * allocs or frees.
252 */
253
254static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
255{
256 size_t alloc_size, i;
257
258 /* Allocated size is a power of 2 to map sequence numbers
259 * (which may be up to 14 bits) in to a smaller array that is
260 * sized for the negotiated ERTM transmit windows.
261 */
262 alloc_size = roundup_pow_of_two(size);
263
264 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
265 if (!seq_list->list)
266 return -ENOMEM;
267
268 seq_list->mask = alloc_size - 1;
269 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
270 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
271 for (i = 0; i < alloc_size; i++)
272 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
273
274 return 0;
275}
276
277static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
278{
279 kfree(seq_list->list);
280}
281
282static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
283 u16 seq)
284{
285 /* Constant-time check for list membership */
286 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
287}
288
289static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
290{
291 u16 mask = seq_list->mask;
292
293 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
294 /* In case someone tries to pop the head of an empty list */
295 return L2CAP_SEQ_LIST_CLEAR;
296 } else if (seq_list->head == seq) {
297 /* Head can be removed in constant time */
298 seq_list->head = seq_list->list[seq & mask];
299 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
300
301 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
302 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
303 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
304 }
305 } else {
306 /* Walk the list to find the sequence number */
307 u16 prev = seq_list->head;
308 while (seq_list->list[prev & mask] != seq) {
309 prev = seq_list->list[prev & mask];
310 if (prev == L2CAP_SEQ_LIST_TAIL)
311 return L2CAP_SEQ_LIST_CLEAR;
312 }
313
314 /* Unlink the number from the list and clear it */
315 seq_list->list[prev & mask] = seq_list->list[seq & mask];
316 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
317 if (seq_list->tail == seq)
318 seq_list->tail = prev;
319 }
320 return seq;
321}
322
323static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
324{
325 /* Remove the head in constant time */
326 return l2cap_seq_list_remove(seq_list, seq_list->head);
327}
328
329static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
330{
f522ae36 331 u16 i;
3c588192 332
f522ae36
GP		 333 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
334 return;
335
336 for (i = 0; i <= seq_list->mask; i++)
337 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
338
339 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
340 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 341}
342
343static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
344{
345 u16 mask = seq_list->mask;
346
347 /* All appends happen in constant time */
348
f522ae36
GP		 349 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
350 return;
3c588192 351
f522ae36
GP		 352 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
353 seq_list->head = seq;
354 else
355 seq_list->list[seq_list->tail & mask] = seq;
356
357 seq_list->tail = seq;
358 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 359}
360
721c4181 361static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 362{
721c4181
GP		 363 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
364 chan_timer.work);
3df91ea2 365 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 366 int reason;
367
e05dcc32 368 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 369
3df91ea2 370 mutex_lock(&conn->chan_lock);
6be36555 371 l2cap_chan_lock(chan);
ab07801d 372
89bc500e 373 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 374 reason = ECONNREFUSED;
89bc500e 375 else if (chan->state == BT_CONNECT &&
ab07801d
GP		 376 chan->sec_level != BT_SECURITY_SDP)
377 reason = ECONNREFUSED;
378 else
379 reason = ETIMEDOUT;
380
0f852724 381 l2cap_chan_close(chan, reason);
ab07801d 382
6be36555 383 l2cap_chan_unlock(chan);
ab07801d 384
80b98027 385 chan->ops->close(chan);
3df91ea2
AE		 386 mutex_unlock(&conn->chan_lock);
387
371fd835 388 l2cap_chan_put(chan);
ab07801d
GP		 389}
390
eef1d9b6 391struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 392{
393 struct l2cap_chan *chan;
394
395 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
396 if (!chan)
397 return NULL;
398
c03b355e
AE		 399 mutex_init(&chan->lock);
400
333055f2 401 write_lock(&chan_list_lock);
23691d75 402 list_add(&chan->global_l, &chan_list);
333055f2 403 write_unlock(&chan_list_lock);
23691d75 404
721c4181 405 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 406
89bc500e
GP		 407 chan->state = BT_OPEN;
408
144ad330 409 kref_init(&chan->kref);
71ba0e56 410
2827011f
MM		 411 /* This flag is cleared in l2cap_chan_ready() */
412 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
413
eef1d9b6 414 BT_DBG("chan %p", chan);
abc545b8 415
48454079
GP		 416 return chan;
417}
418
144ad330 419static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 420{
144ad330
SS		 421 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
422
4af66c69
JK		 423 BT_DBG("chan %p", chan);
424
333055f2 425 write_lock(&chan_list_lock);
23691d75 426 list_del(&chan->global_l);
333055f2 427 write_unlock(&chan_list_lock);
23691d75 428
4af66c69 429 kfree(chan);
6ff5abbf
GP		 430}
431
30648372
JK		 432void l2cap_chan_hold(struct l2cap_chan *c)
433{
144ad330 434 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 435
144ad330 436 kref_get(&c->kref);
30648372
JK		 437}
438
439void l2cap_chan_put(struct l2cap_chan *c)
440{
144ad330 441 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 442
144ad330 443 kref_put(&c->kref, l2cap_chan_destroy);
30648372
JK		 444}
445
bd4b1653
AE		 446void l2cap_chan_set_defaults(struct l2cap_chan *chan)
447{
448 chan->fcs = L2CAP_FCS_CRC16;
449 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
450 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
451 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
c20f8e35 452 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653
AE		 453 chan->sec_level = BT_SECURITY_LOW;
454
455 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
456}
457
93c3e8f5 458void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 459{
af05b30b 460 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 461 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 462
9f5a0d7b 463 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 464
8c1d787b 465 chan->conn = conn;
0139418c 466
5491120e
AE		 467 switch (chan->chan_type) {
468 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b
VT		 469 if (conn->hcon->type == LE_LINK) {
470 /* LE connection */
6fcb06a2 471 chan->omtu = L2CAP_DEFAULT_MTU;
fe4128e0
GP		 472 chan->scid = L2CAP_CID_LE_DATA;
473 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 474 } else {
475 /* Alloc CID for connection-oriented socket */
fe4128e0 476 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 477 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 478 }
5491120e
AE		 479 break;
480
481 case L2CAP_CHAN_CONN_LESS:
0139418c 482 /* Connectionless socket */
fe4128e0
GP		 483 chan->scid = L2CAP_CID_CONN_LESS;
484 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 485 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 486 break;
487
416fa752
AE		 488 case L2CAP_CHAN_CONN_FIX_A2MP:
489 chan->scid = L2CAP_CID_A2MP;
490 chan->dcid = L2CAP_CID_A2MP;
491 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
492 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
493 break;
494
5491120e 495 default:
0139418c 496 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 497 chan->scid = L2CAP_CID_SIGNALING;
498 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 499 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 500 }
501
8f7975b1
AE		 502 chan->local_id = L2CAP_BESTEFFORT_ID;
503 chan->local_stype = L2CAP_SERV_BESTEFFORT;
504 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
505 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
506 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
507 chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO;
508
371fd835 509 l2cap_chan_hold(chan);
baa7e1fa 510
3df91ea2 511 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 512}
513
466f8004 514void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 515{
516 mutex_lock(&conn->chan_lock);
517 __l2cap_chan_add(conn, chan);
3df91ea2 518 mutex_unlock(&conn->chan_lock);
0139418c
MH		 519}
520
466f8004 521void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 522{
8c1d787b 523 struct l2cap_conn *conn = chan->conn;
0139418c 524
c9b66675 525 __clear_chan_timer(chan);
0139418c 526
49208c9c 527 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 528
8e87d142 529 if (conn) {
baa7e1fa 530 /* Delete from channel list */
3df91ea2 531 list_del(&chan->list);
3d57dc68 532
371fd835 533 l2cap_chan_put(chan);
baa7e1fa 534
8c1d787b 535 chan->conn = NULL;
3cabbfda
AE		 536
537 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
538 hci_conn_put(conn->hcon);
0139418c
MH		 539 }
540
c0df7f6e
AE		 541 if (chan->ops->teardown)
542 chan->ops->teardown(chan, err);
6be36555 543
2827011f 544 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 545 return;
2ead70b8 546
ee556f66
GP		 547 switch(chan->mode) {
548 case L2CAP_MODE_BASIC:
549 break;
c13ffa62 550
ee556f66 551 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 552 __clear_retrans_timer(chan);
553 __clear_monitor_timer(chan);
554 __clear_ack_timer(chan);
c13ffa62 555
f1c6775b 556 skb_queue_purge(&chan->srej_q);
c13ffa62 557
3c588192
MM		 558 l2cap_seq_list_free(&chan->srej_list);
559 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 560
561 /* fall through */
562
563 case L2CAP_MODE_STREAMING:
564 skb_queue_purge(&chan->tx_q);
565 break;
c13ffa62 566 }
ee556f66
GP		 567
568 return;
0139418c
MH		 569}
570
0f852724 571void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 572{
573 struct l2cap_conn *conn = chan->conn;
574 struct sock *sk = chan->sk;
575
e05dcc32
AE		 576 BT_DBG("chan %p state %s sk %p", chan,
577 state_to_string(chan->state), sk);
4519de9a 578
89bc500e 579 switch (chan->state) {
4519de9a 580 case BT_LISTEN:
c0df7f6e
AE		 581 if (chan->ops->teardown)
582 chan->ops->teardown(chan, 0);
4519de9a
GP		 583 break;
584
585 case BT_CONNECTED:
586 case BT_CONFIG:
715ec005 587 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a 588 conn->hcon->type == ACL_LINK) {
c9b66675 589 __set_chan_timer(chan, sk->sk_sndtimeo);
4519de9a
GP		 590 l2cap_send_disconn_req(conn, chan, reason);
591 } else
592 l2cap_chan_del(chan, reason);
593 break;
594
595 case BT_CONNECT2:
715ec005 596 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a
GP		 597 conn->hcon->type == ACL_LINK) {
598 struct l2cap_conn_rsp rsp;
599 __u16 result;
600
c5daa683 601 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
4519de9a
GP		 602 result = L2CAP_CR_SEC_BLOCK;
603 else
604 result = L2CAP_CR_BAD_PSM;
89bc500e 605 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 606
607 rsp.scid = cpu_to_le16(chan->dcid);
608 rsp.dcid = cpu_to_le16(chan->scid);
609 rsp.result = cpu_to_le16(result);
ac73498c 610 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4519de9a
GP		 611 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
612 sizeof(rsp), &rsp);
613 }
614
615 l2cap_chan_del(chan, reason);
616 break;
617
618 case BT_CONNECT:
619 case BT_DISCONN:
620 l2cap_chan_del(chan, reason);
621 break;
622
623 default:
c0df7f6e
AE		 624 if (chan->ops->teardown)
625 chan->ops->teardown(chan, 0);
4519de9a
GP		 626 break;
627 }
628}
629
4343478f 630static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 631{
715ec005 632 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 633 switch (chan->sec_level) {
8556edd3
JH		 634 case BT_SECURITY_HIGH:
635 return HCI_AT_DEDICATED_BONDING_MITM;
636 case BT_SECURITY_MEDIUM:
637 return HCI_AT_DEDICATED_BONDING;
638 default:
639 return HCI_AT_NO_BONDING;
640 }
2983fd68 641 } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
4343478f
GP		 642 if (chan->sec_level == BT_SECURITY_LOW)
643 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 644
4343478f 645 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 646 return HCI_AT_NO_BONDING_MITM;
00ae4af9 647 else
8556edd3 648 return HCI_AT_NO_BONDING;
00ae4af9 649 } else {
4343478f 650 switch (chan->sec_level) {
00ae4af9 651 case BT_SECURITY_HIGH:
8556edd3 652 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 653 case BT_SECURITY_MEDIUM:
8556edd3 654 return HCI_AT_GENERAL_BONDING;
00ae4af9 655 default:
8556edd3 656 return HCI_AT_NO_BONDING;
00ae4af9 657 }
0684e5f9 658 }
8556edd3
JH		 659}
660
661/* Service level security */
d45fc423 662int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 663{
8c1d787b 664 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 665 __u8 auth_type;
666
4343478f 667 auth_type = l2cap_get_auth_type(chan);
79d554a6 668
4343478f 669 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 670}
671
b5ad8b7f 672static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 673{
674 u8 id;
675
676 /* Get next available identificator.
677 * 1 - 128 are used by kernel.
678 * 129 - 199 are reserved.
679 * 200 - 254 are used by utilities like l2ping, etc.
680 */
681
333055f2 682 spin_lock(&conn->lock);
4e8402a3
MH		 683
684 if (++conn->tx_ident > 128)
685 conn->tx_ident = 1;
686
687 id = conn->tx_ident;
688
333055f2 689 spin_unlock(&conn->lock);
4e8402a3
MH		 690
691 return id;
692}
693
4519de9a 694static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 695{
696 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 697 u8 flags;
4e8402a3
MH		 698
699 BT_DBG("code 0x%2.2x", code);
700
701 if (!skb)
9a9c6a34 702 return;
4e8402a3 703
e702112f
AE		 704 if (lmp_no_flush_capable(conn->hcon->hdev))
705 flags = ACL_START_NO_FLUSH;
706 else
707 flags = ACL_START;
708
14b12d0b 709 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 710 skb->priority = HCI_PRIO_MAX;
14b12d0b 711
73d80deb
LAD		 712 hci_send_acl(conn->hchan, skb, flags);
713}
714
715static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
716{
717 struct hci_conn *hcon = chan->conn->hcon;
718 u16 flags;
719
720 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
721 skb->priority);
722
723 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
724 lmp_no_flush_capable(hcon->hdev))
725 flags = ACL_START_NO_FLUSH;
726 else
727 flags = ACL_START;
14b12d0b 728
73d80deb
LAD		 729 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
730 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 731}
732
b76bbd66
MM		 733static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
734{
735 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
736 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
737
738 if (enh & L2CAP_CTRL_FRAME_TYPE) {
739 /* S-Frame */
740 control->sframe = 1;
741 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
742 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
743
744 control->sar = 0;
745 control->txseq = 0;
746 } else {
747 /* I-Frame */
748 control->sframe = 0;
749 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
750 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
751
752 control->poll = 0;
753 control->super = 0;
754 }
755}
756
b76bbd66
MM		 757static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
758{
759 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
760 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
761
762 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
763 /* S-Frame */
764 control->sframe = 1;
765 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
766 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
767
768 control->sar = 0;
769 control->txseq = 0;
770 } else {
771 /* I-Frame */
772 control->sframe = 0;
773 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
774 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
775
776 control->poll = 0;
777 control->super = 0;
778 }
779}
780
781static inline void __unpack_control(struct l2cap_chan *chan,
782 struct sk_buff *skb)
783{
784 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
785 __unpack_extended_control(get_unaligned_le32(skb->data),
786 &bt_cb(skb)->control);
cec8ab6e 787 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 788 } else {
789 __unpack_enhanced_control(get_unaligned_le16(skb->data),
790 &bt_cb(skb)->control);
cec8ab6e 791 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 792 }
793}
794
b5c6aaed
MM		 795static u32 __pack_extended_control(struct l2cap_ctrl *control)
796{
797 u32 packed;
798
799 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
800 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
801
802 if (control->sframe) {
803 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
804 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
805 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
806 } else {
807 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
808 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
809 }
810
811 return packed;
812}
813
814static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
815{
816 u16 packed;
817
818 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
819 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
820
821 if (control->sframe) {
822 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
823 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
824 packed |= L2CAP_CTRL_FRAME_TYPE;
825 } else {
826 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
827 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
828 }
829
830 return packed;
831}
832
b76bbd66
MM		 833static inline void __pack_control(struct l2cap_chan *chan,
834 struct l2cap_ctrl *control,
835 struct sk_buff *skb)
836{
837 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
838 put_unaligned_le32(__pack_extended_control(control),
839 skb->data + L2CAP_HDR_SIZE);
840 } else {
841 put_unaligned_le16(__pack_enhanced_control(control),
842 skb->data + L2CAP_HDR_SIZE);
843 }
844}
845
ba7aa64f
GP		 846static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
847{
848 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
849 return L2CAP_EXT_HDR_SIZE;
850 else
851 return L2CAP_ENH_HDR_SIZE;
852}
853
a67d7f6f
MM		 854static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
855 u32 control)
b5c6aaed
MM		 856{
857 struct sk_buff *skb;
858 struct l2cap_hdr *lh;
ba7aa64f 859 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 860
861 if (chan->fcs == L2CAP_FCS_CRC16)
862 hlen += L2CAP_FCS_SIZE;
863
a67d7f6f 864 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 865
b5c6aaed 866 if (!skb)
a67d7f6f 867 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 868
869 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
870 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
871 lh->cid = cpu_to_le16(chan->dcid);
872
a67d7f6f
MM		 873 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
874 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
875 else
876 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 877
878 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 879 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 880 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
881 }
882
883 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 884 return skb;
885}
886
887static void l2cap_send_sframe(struct l2cap_chan *chan,
888 struct l2cap_ctrl *control)
889{
890 struct sk_buff *skb;
891 u32 control_field;
892
893 BT_DBG("chan %p, control %p", chan, control);
894
895 if (!control->sframe)
896 return;
897
898 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
899 !control->poll)
900 control->final = 1;
901
902 if (control->super == L2CAP_SUPER_RR)
903 clear_bit(CONN_RNR_SENT, &chan->conn_state);
904 else if (control->super == L2CAP_SUPER_RNR)
905 set_bit(CONN_RNR_SENT, &chan->conn_state);
906
907 if (control->super != L2CAP_SUPER_SREJ) {
908 chan->last_acked_seq = control->reqseq;
909 __clear_ack_timer(chan);
910 }
911
912 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
913 control->final, control->poll, control->super);
914
915 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
916 control_field = __pack_extended_control(control);
917 else
918 control_field = __pack_enhanced_control(control);
919
920 skb = l2cap_create_sframe_pdu(chan, control_field);
921 if (!IS_ERR(skb))
922 l2cap_do_send(chan, skb);
b5c6aaed
MM		 923}
924
c9e3d5e0 925static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 926{
c9e3d5e0
MM		 927 struct l2cap_ctrl control;
928
929 BT_DBG("chan %p, poll %d", chan, poll);
930
931 memset(&control, 0, sizeof(control));
932 control.sframe = 1;
933 control.poll = poll;
934
935 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
936 control.super = L2CAP_SUPER_RNR;
937 else
938 control.super = L2CAP_SUPER_RR;
b5c6aaed 939
c9e3d5e0
MM		 940 control.reqseq = chan->buffer_seq;
941 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 942}
943
b4450035 944static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 945{
c1360a1c 946 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 947}
948
93c3e8f5
AE		 949static bool __amp_capable(struct l2cap_chan *chan)
950{
951 struct l2cap_conn *conn = chan->conn;
952
953 if (enable_hs &&
954 chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED &&
955 conn->fixed_chan_mask & L2CAP_FC_A2MP)
956 return true;
957 else
958 return false;
959}
960
9b27f350
AE		 961static void l2cap_send_conn_req(struct l2cap_chan *chan)
962{
963 struct l2cap_conn *conn = chan->conn;
964 struct l2cap_conn_req req;
965
966 req.scid = cpu_to_le16(chan->scid);
967 req.psm = chan->psm;
968
969 chan->ident = l2cap_get_ident(conn);
970
971 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
972
973 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
974}
975
9f0caeb1
VCG		 976static void l2cap_chan_ready(struct l2cap_chan *chan)
977{
2827011f 978 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 979 chan->conf_state = 0;
980 __clear_chan_timer(chan);
981
54a59aa2 982 chan->state = BT_CONNECTED;
9f0caeb1 983
fd83e2c2 984 chan->ops->ready(chan);
9f0caeb1
VCG		 985}
986
93c3e8f5
AE		 987static void l2cap_start_connection(struct l2cap_chan *chan)
988{
989 if (__amp_capable(chan)) {
990 BT_DBG("chan %p AMP capable: discover AMPs", chan);
991 a2mp_discover_amp(chan);
992 } else {
993 l2cap_send_conn_req(chan);
994 }
995}
996
fc7f8a7e 997static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 998{
8c1d787b 999 struct l2cap_conn *conn = chan->conn;
79d554a6 1000
9f0caeb1
VCG		 1001 if (conn->hcon->type == LE_LINK) {
1002 l2cap_chan_ready(chan);
1003 return;
1004 }
1005
79d554a6 1006 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1007 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1008 return;
1009
d45fc423 1010 if (l2cap_chan_check_security(chan) &&
93c3e8f5
AE		 1011 __l2cap_no_conn_pending(chan)) {
1012 l2cap_start_connection(chan);
1013 }
79d554a6
MH		 1014 } else {
1015 struct l2cap_info_req req;
ac73498c 1016 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1017
1018 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1019 conn->info_ident = l2cap_get_ident(conn);
1020
ba13ccd9 1021 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6
MH		 1022
1023 l2cap_send_cmd(conn, conn->info_ident,
1024 L2CAP_INFO_REQ, sizeof(req), &req);
1025 }
1026}
1027
cf6c2c0b
GP		 1028static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1029{
1030 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1031 if (!disable_ertm)
cf6c2c0b
GP		 1032 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1033
1034 switch (mode) {
1035 case L2CAP_MODE_ERTM:
1036 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1037 case L2CAP_MODE_STREAMING:
1038 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1039 default:
1040 return 0x00;
1041 }
1042}
1043
4519de9a 1044static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
22121fc9 1045{
6be36555 1046 struct sock *sk = chan->sk;
22121fc9
GP		 1047 struct l2cap_disconn_req req;
1048
c13ffa62
GP		 1049 if (!conn)
1050 return;
1051
0c1bc5c6 1052 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 1053 __clear_retrans_timer(chan);
1054 __clear_monitor_timer(chan);
1055 __clear_ack_timer(chan);
c13ffa62
GP		 1056 }
1057
416fa752
AE		 1058 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1059 __l2cap_state_change(chan, BT_DISCONN);
1060 return;
1061 }
1062
fe4128e0
GP		 1063 req.dcid = cpu_to_le16(chan->dcid);
1064 req.scid = cpu_to_le16(chan->scid);
22121fc9
GP		 1065 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1066 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62 1067
6be36555 1068 lock_sock(sk);
0e587be7 1069 __l2cap_state_change(chan, BT_DISCONN);
2e0052e4 1070 __l2cap_chan_set_err(chan, err);
6be36555 1071 release_sock(sk);
22121fc9
GP		 1072}
1073
1da177e4 1074/* ---- L2CAP connections ---- */
4e8402a3
MH		 1075static void l2cap_conn_start(struct l2cap_conn *conn)
1076{
3df91ea2 1077 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1078
1079 BT_DBG("conn %p", conn);
1080
3df91ea2 1081 mutex_lock(&conn->chan_lock);
4e8402a3 1082
3df91ea2 1083 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 1084 struct sock *sk = chan->sk;
baa7e1fa 1085
6be36555 1086 l2cap_chan_lock(chan);
4e8402a3 1087
715ec005 1088 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1089 l2cap_chan_unlock(chan);
79d554a6
MH		 1090 continue;
1091 }
1092
89bc500e 1093 if (chan->state == BT_CONNECT) {
d45fc423 1094 if (!l2cap_chan_check_security(chan) ||
b4450035 1095 !__l2cap_no_conn_pending(chan)) {
6be36555 1096 l2cap_chan_unlock(chan);
47731de7
GP		 1097 continue;
1098 }
79d554a6 1099
c1360a1c
GP		 1100 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1101 && test_bit(CONF_STATE2_DEVICE,
1102 &chan->conf_state)) {
89bc500e 1103 l2cap_chan_close(chan, ECONNRESET);
6be36555 1104 l2cap_chan_unlock(chan);
47731de7 1105 continue;
b1235d79 1106 }
47731de7 1107
93c3e8f5 1108 l2cap_start_connection(chan);
47731de7 1109
89bc500e 1110 } else if (chan->state == BT_CONNECT2) {
79d554a6 1111 struct l2cap_conn_rsp rsp;
e9aeb2dd 1112 char buf[128];
fe4128e0
GP		 1113 rsp.scid = cpu_to_le16(chan->dcid);
1114 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1115
d45fc423 1116 if (l2cap_chan_check_security(chan)) {
6be36555 1117 lock_sock(sk);
c5daa683
GP		 1118 if (test_bit(BT_SK_DEFER_SETUP,
1119 &bt_sk(sk)->flags)) {
f66dc81f 1120 struct sock *parent = bt_sk(sk)->parent;
ac73498c
AE		 1121 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1122 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
05e9a2f6
IK		 1123 if (parent)
1124 parent->sk_data_ready(parent, 0);
f66dc81f
MH		 1125
1126 } else {
0e587be7 1127 __l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1128 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1129 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1130 }
6be36555 1131 release_sock(sk);
79d554a6 1132 } else {
ac73498c
AE		 1133 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1134 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1135 }
1136
fc7f8a7e
GP		 1137 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1138 sizeof(rsp), &rsp);
e9aeb2dd 1139
c1360a1c 1140 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
e9aeb2dd 1141 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1142 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1143 continue;
1144 }
1145
c1360a1c 1146 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1147 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 1148 l2cap_build_conf_req(chan, buf), buf);
1149 chan->num_conf_req++;
4e8402a3
MH		 1150 }
1151
6be36555 1152 l2cap_chan_unlock(chan);
4e8402a3
MH		 1153 }
1154
3df91ea2 1155 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1156}
1157
c2287681 1158/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1159 * Returns closest match, locked.
1160 */
d9b88702 1161static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1162 bdaddr_t *src,
1163 bdaddr_t *dst)
b62f328b 1164{
23691d75 1165 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1166
23691d75 1167 read_lock(&chan_list_lock);
b62f328b 1168
23691d75
GP		 1169 list_for_each_entry(c, &chan_list, global_l) {
1170 struct sock *sk = c->sk;
fe4128e0 1171
89bc500e 1172 if (state && c->state != state)
b62f328b
VT		 1173 continue;
1174
23691d75 1175 if (c->scid == cid) {
c2287681
IY		 1176 int src_match, dst_match;
1177 int src_any, dst_any;
1178
b62f328b 1179 /* Exact match. */
c2287681
IY		 1180 src_match = !bacmp(&bt_sk(sk)->src, src);
1181 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1182 if (src_match && dst_match) {
23691d75
GP		 1183 read_unlock(&chan_list_lock);
1184 return c;
1185 }
b62f328b
VT		 1186
1187 /* Closest match */
c2287681
IY		 1188 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1189 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1190 if ((src_match && dst_any) || (src_any && dst_match) ||
1191 (src_any && dst_any))
23691d75 1192 c1 = c;
b62f328b
VT		 1193 }
1194 }
280f294f 1195
23691d75 1196 read_unlock(&chan_list_lock);
b62f328b 1197
23691d75 1198 return c1;
b62f328b
VT		 1199}
1200
1201static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1202{
c916fbe4 1203 struct sock *parent, *sk;
23691d75 1204 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 1205
1206 BT_DBG("");
1207
1208 /* Check if we have socket listening on cid */
23691d75 1209 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
c2287681 1210 conn->src, conn->dst);
23691d75 1211 if (!pchan)
b62f328b
VT		 1212 return;
1213
23691d75
GP		 1214 parent = pchan->sk;
1215
aa2ac881 1216 lock_sock(parent);
62f3a2cf 1217
80b98027 1218 chan = pchan->ops->new_connection(pchan);
80808e43 1219 if (!chan)
b62f328b
VT		 1220 goto clean;
1221
80808e43 1222 sk = chan->sk;
5d41ce1d 1223
b62f328b 1224 hci_conn_hold(conn->hcon);
a9ea3ed9 1225 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
b62f328b 1226
b62f328b
VT		 1227 bacpy(&bt_sk(sk)->src, conn->src);
1228 bacpy(&bt_sk(sk)->dst, conn->dst);
1229
d1010240
GP		 1230 bt_accept_enqueue(parent, sk);
1231
3d57dc68 1232 l2cap_chan_add(conn, chan);
48454079 1233
6754e0df 1234 l2cap_chan_ready(chan);
b62f328b 1235
b62f328b 1236clean:
aa2ac881 1237 release_sock(parent);
b62f328b
VT		 1238}
1239
4e8402a3
MH		 1240static void l2cap_conn_ready(struct l2cap_conn *conn)
1241{
48454079 1242 struct l2cap_chan *chan;
cc110922 1243 struct hci_conn *hcon = conn->hcon;
4e8402a3 1244
79d554a6 1245 BT_DBG("conn %p", conn);
4e8402a3 1246
cc110922 1247 if (!hcon->out && hcon->type == LE_LINK)
b62f328b
VT		 1248 l2cap_le_conn_ready(conn);
1249
cc110922
VCG		 1250 if (hcon->out && hcon->type == LE_LINK)
1251 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1252
3df91ea2 1253 mutex_lock(&conn->chan_lock);
4e8402a3 1254
3df91ea2 1255 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1256
6be36555 1257 l2cap_chan_lock(chan);
4e8402a3 1258
416fa752
AE		 1259 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1260 l2cap_chan_unlock(chan);
1261 continue;
1262 }
1263
cc110922
VCG		 1264 if (hcon->type == LE_LINK) {
1265 if (smp_conn_security(hcon, chan->sec_level))
cf4cd009 1266 l2cap_chan_ready(chan);
acd7d370 1267
63128451 1268 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1269 struct sock *sk = chan->sk;
c9b66675 1270 __clear_chan_timer(chan);
6be36555 1271 lock_sock(sk);
0e587be7 1272 __l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1273 sk->sk_state_change(sk);
6be36555 1274 release_sock(sk);
b501d6a1 1275
89bc500e 1276 } else if (chan->state == BT_CONNECT)
fc7f8a7e 1277 l2cap_do_start(chan);
4e8402a3 1278
6be36555 1279 l2cap_chan_unlock(chan);
4e8402a3 1280 }
79d554a6 1281
3df91ea2 1282 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1283}
1284
1285/* Notify sockets that we cannot guaranty reliability anymore */
1286static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1287{
48454079 1288 struct l2cap_chan *chan;
4e8402a3
MH		 1289
1290 BT_DBG("conn %p", conn);
1291
3df91ea2 1292 mutex_lock(&conn->chan_lock);
4e8402a3 1293
3df91ea2 1294 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1295 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
2e0052e4 1296 __l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1297 }
1298
3df91ea2 1299 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1300}
1301
f878fcad 1302static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1303{
f878fcad 1304 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
030013d8 1305 info_timer.work);
4e8402a3 1306
984947dc 1307 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1308 conn->info_ident = 0;
984947dc 1309
4e8402a3
MH		 1310 l2cap_conn_start(conn);
1311}
1312
5d3de7df
VCG		 1313static void l2cap_conn_del(struct hci_conn *hcon, int err)
1314{
1315 struct l2cap_conn *conn = hcon->l2cap_data;
1316 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1317
1318 if (!conn)
1319 return;
1320
1321 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1322
1323 kfree_skb(conn->rx_skb);
1324
3df91ea2
AE		 1325 mutex_lock(&conn->chan_lock);
1326
5d3de7df
VCG		 1327 /* Kill channels */
1328 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1329 l2cap_chan_hold(chan);
6be36555
AE		 1330 l2cap_chan_lock(chan);
1331
5d3de7df 1332 l2cap_chan_del(chan, err);
6be36555
AE		 1333
1334 l2cap_chan_unlock(chan);
1335
80b98027 1336 chan->ops->close(chan);
61d6ef3e 1337 l2cap_chan_put(chan);
5d3de7df
VCG		 1338 }
1339
3df91ea2
AE		 1340 mutex_unlock(&conn->chan_lock);
1341
73d80deb
LAD		 1342 hci_chan_del(conn->hchan);
1343
5d3de7df 1344 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1345 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1346
51a8efd7 1347 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1348 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1349 smp_chan_destroy(conn);
d26a2345 1350 }
5d3de7df
VCG		 1351
1352 hcon->l2cap_data = NULL;
1353 kfree(conn);
1354}
1355
6c9d42a1 1356static void security_timeout(struct work_struct *work)
5d3de7df 1357{
6c9d42a1
GP		 1358 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1359 security_timer.work);
5d3de7df 1360
d06cc416
JH		 1361 BT_DBG("conn %p", conn);
1362
1363 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1364 smp_chan_destroy(conn);
1365 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1366 }
5d3de7df
VCG		 1367}
1368
1da177e4
LT		 1369static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1370{
0139418c 1371 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1372 struct hci_chan *hchan;
1da177e4 1373
0139418c 1374 if (conn || status)
1da177e4
LT		 1375 return conn;
1376
73d80deb
LAD		 1377 hchan = hci_chan_create(hcon);
1378 if (!hchan)
1379 return NULL;
1380
0139418c 1381 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
73d80deb
LAD		 1382 if (!conn) {
1383 hci_chan_del(hchan);
1da177e4 1384 return NULL;
73d80deb 1385 }
1da177e4
LT		 1386
1387 hcon->l2cap_data = conn;
1388 conn->hcon = hcon;
73d80deb 1389 conn->hchan = hchan;
1da177e4 1390
73d80deb 1391 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1392
acd7d370
VT		 1393 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
1394 conn->mtu = hcon->hdev->le_mtu;
1395 else
1396 conn->mtu = hcon->hdev->acl_mtu;
1397
1da177e4
LT		 1398 conn->src = &hcon->hdev->bdaddr;
1399 conn->dst = &hcon->dst;
1400
4e8402a3
MH		 1401 conn->feat_mask = 0;
1402
1da177e4 1403 spin_lock_init(&conn->lock);
3df91ea2 1404 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1405
1406 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1407
5d3de7df 1408 if (hcon->type == LE_LINK)
6c9d42a1 1409 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1410 else
030013d8 1411 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1412
9f5a0d7b 1413 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1414
1da177e4
LT		 1415 return conn;
1416}
1417
1da177e4 1418/* ---- Socket interface ---- */
1da177e4 1419
c2287681 1420/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1421 * Returns closest match.
1422 */
c2287681
IY		 1423static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1424 bdaddr_t *src,
1425 bdaddr_t *dst)
1da177e4 1426{
23691d75 1427 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1428
23691d75 1429 read_lock(&chan_list_lock);
e0f0cb56 1430
23691d75
GP		 1431 list_for_each_entry(c, &chan_list, global_l) {
1432 struct sock *sk = c->sk;
fe4128e0 1433
89bc500e 1434 if (state && c->state != state)
1da177e4
LT		 1435 continue;
1436
23691d75 1437 if (c->psm == psm) {
c2287681
IY		 1438 int src_match, dst_match;
1439 int src_any, dst_any;
1440
1da177e4 1441 /* Exact match. */
c2287681
IY		 1442 src_match = !bacmp(&bt_sk(sk)->src, src);
1443 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1444 if (src_match && dst_match) {
a7567b20 1445 read_unlock(&chan_list_lock);
23691d75
GP		 1446 return c;
1447 }
1da177e4
LT		 1448
1449 /* Closest match */
c2287681
IY		 1450 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1451 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1452 if ((src_match && dst_any) || (src_any && dst_match) ||
1453 (src_any && dst_any))
23691d75 1454 c1 = c;
1da177e4
LT		 1455 }
1456 }
1da177e4 1457
23691d75 1458 read_unlock(&chan_list_lock);
e0f0cb56 1459
23691d75 1460 return c1;
1da177e4
LT		 1461}
1462
8e9f9892
AG		 1463int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1464 bdaddr_t *dst, u8 dst_type)
1da177e4 1465{
5d41ce1d 1466 struct sock *sk = chan->sk;
1da177e4 1467 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1468 struct l2cap_conn *conn;
1469 struct hci_conn *hcon;
1470 struct hci_dev *hdev;
09ab6f4c 1471 __u8 auth_type;
44d0e48e 1472 int err;
1da177e4 1473
8e9f9892 1474 BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst),
ab19516a 1475 dst_type, __le16_to_cpu(psm));
1da177e4 1476
af05b30b
GP		 1477 hdev = hci_get_route(dst, src);
1478 if (!hdev)
1da177e4
LT		 1479 return -EHOSTUNREACH;
1480
09fd0de5 1481 hci_dev_lock(hdev);
1da177e4 1482
6be36555 1483 l2cap_chan_lock(chan);
03a00194
GP		 1484
1485 /* PSM must be odd and lsb of upper byte must be 0 */
1486 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1487 chan->chan_type != L2CAP_CHAN_RAW) {
1488 err = -EINVAL;
1489 goto done;
1490 }
1491
1492 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1493 err = -EINVAL;
1494 goto done;
1495 }
1496
1497 switch (chan->mode) {
1498 case L2CAP_MODE_BASIC:
1499 break;
1500 case L2CAP_MODE_ERTM:
1501 case L2CAP_MODE_STREAMING:
1502 if (!disable_ertm)
1503 break;
1504 /* fall through */
1505 default:
1506 err = -ENOTSUPP;
1507 goto done;
1508 }
1509
0797e01d 1510 switch (chan->state) {
03a00194
GP		 1511 case BT_CONNECT:
1512 case BT_CONNECT2:
1513 case BT_CONFIG:
1514 /* Already connecting */
1515 err = 0;
1516 goto done;
1517
1518 case BT_CONNECTED:
1519 /* Already connected */
1520 err = -EISCONN;
1521 goto done;
1522
1523 case BT_OPEN:
1524 case BT_BOUND:
1525 /* Can connect */
1526 break;
1527
1528 default:
1529 err = -EBADFD;
1530 goto done;
1531 }
1532
1533 /* Set destination address and psm */
0797e01d 1534 lock_sock(sk);
9219b2a0 1535 bacpy(&bt_sk(sk)->dst, dst);
6be36555
AE		 1536 release_sock(sk);
1537
03a00194
GP		 1538 chan->psm = psm;
1539 chan->dcid = cid;
1da177e4 1540
4343478f 1541 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1542
fe4128e0 1543 if (chan->dcid == L2CAP_CID_LE_DATA)
8e9f9892 1544 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1545 chan->sec_level, auth_type);
acd7d370 1546 else
8e9f9892 1547 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1548 chan->sec_level, auth_type);
acd7d370 1549
30e76272
VT		 1550 if (IS_ERR(hcon)) {
1551 err = PTR_ERR(hcon);
1da177e4 1552 goto done;
30e76272 1553 }
1da177e4
LT		 1554
1555 conn = l2cap_conn_add(hcon, 0);
1556 if (!conn) {
1557 hci_conn_put(hcon);
30e76272 1558 err = -ENOMEM;
1da177e4
LT		 1559 goto done;
1560 }
1561
9f0caeb1
VCG		 1562 if (hcon->type == LE_LINK) {
1563 err = 0;
1564
1565 if (!list_empty(&conn->chan_l)) {
1566 err = -EBUSY;
1567 hci_conn_put(hcon);
1568 }
1569
1570 if (err)
1571 goto done;
1572 }
1573
1da177e4
LT		 1574 /* Update source addr of the socket */
1575 bacpy(src, conn->src);
1576
6be36555 1577 l2cap_chan_unlock(chan);
48454079 1578 l2cap_chan_add(conn, chan);
6be36555 1579 l2cap_chan_lock(chan);
48454079 1580
6be36555 1581 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1582 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1583
1584 if (hcon->state == BT_CONNECTED) {
715ec005 1585 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1586 __clear_chan_timer(chan);
d45fc423 1587 if (l2cap_chan_check_security(chan))
6be36555 1588 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1589 } else
fc7f8a7e 1590 l2cap_do_start(chan);
1da177e4
LT		 1591 }
1592
30e76272
VT		 1593 err = 0;
1594
1da177e4 1595done:
6be36555 1596 l2cap_chan_unlock(chan);
09fd0de5 1597 hci_dev_unlock(hdev);
1da177e4
LT		 1598 hci_dev_put(hdev);
1599 return err;
1600}
1601
dcba0dba 1602int __l2cap_wait_ack(struct sock *sk)
6161c038 1603{
8c1d787b 1604 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1605 DECLARE_WAITQUEUE(wait, current);
1606 int err = 0;
1607 int timeo = HZ/5;
1608
2b0b05dd 1609 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1610 set_current_state(TASK_INTERRUPTIBLE);
1611 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1612 if (!timeo)
1613 timeo = HZ/5;
1614
1615 if (signal_pending(current)) {
1616 err = sock_intr_errno(timeo);
1617 break;
1618 }
1619
1620 release_sock(sk);
1621 timeo = schedule_timeout(timeo);
1622 lock_sock(sk);
a71a0cf4 1623 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1624
1625 err = sock_error(sk);
1626 if (err)
1627 break;
1628 }
1629 set_current_state(TASK_RUNNING);
2b0b05dd 1630 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1631 return err;
1632}
1633
721c4181 1634static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1635{
721c4181 1636 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1637 monitor_timer.work);
e90bac06 1638
525cd185 1639 BT_DBG("chan %p", chan);
0e98958d 1640
6be36555
AE		 1641 l2cap_chan_lock(chan);
1642
80909e04 1643 if (!chan->conn) {
6be36555 1644 l2cap_chan_unlock(chan);
8d7e1c7f 1645 l2cap_chan_put(chan);
e90bac06
GP		 1646 return;
1647 }
1648
401bb1f7 1649 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1650
6be36555 1651 l2cap_chan_unlock(chan);
8d7e1c7f 1652 l2cap_chan_put(chan);
e90bac06
GP		 1653}
1654
721c4181 1655static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1656{
721c4181 1657 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1658 retrans_timer.work);
e90bac06 1659
49208c9c 1660 BT_DBG("chan %p", chan);
0e98958d 1661
6be36555
AE		 1662 l2cap_chan_lock(chan);
1663
80909e04
MM		 1664 if (!chan->conn) {
1665 l2cap_chan_unlock(chan);
1666 l2cap_chan_put(chan);
1667 return;
1668 }
6be36555 1669
401bb1f7 1670 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1671 l2cap_chan_unlock(chan);
8d7e1c7f 1672 l2cap_chan_put(chan);
e90bac06
GP		 1673}
1674
d660366d
GP		 1675static void l2cap_streaming_send(struct l2cap_chan *chan,
1676 struct sk_buff_head *skbs)
6840ed07 1677{
ccbb84af 1678 struct sk_buff *skb;
3733937d 1679 struct l2cap_ctrl *control;
6840ed07 1680
3733937d
MM		 1681 BT_DBG("chan %p, skbs %p", chan, skbs);
1682
3733937d
MM		 1683 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1684
1685 while (!skb_queue_empty(&chan->tx_q)) {
1686
1687 skb = skb_dequeue(&chan->tx_q);
1688
1689 bt_cb(skb)->control.retries = 1;
1690 control = &bt_cb(skb)->control;
1691
1692 control->reqseq = 0;
1693 control->txseq = chan->next_tx_seq;
1694
1695 __pack_control(chan, control, skb);
6840ed07 1696
47d1ec61 1697 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1698 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1699 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1700 }
1701
4343478f 1702 l2cap_do_send(chan, skb);
6840ed07 1703
b4400672 1704 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1705
836be934 1706 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1707 chan->frames_sent++;
6840ed07 1708 }
6840ed07
GP		 1709}
1710
67c9e840 1711static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1712{
1713 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1714 struct l2cap_ctrl *control;
1715 int sent = 0;
1716
1717 BT_DBG("chan %p", chan);
1c2acffb 1718
89bc500e 1719 if (chan->state != BT_CONNECTED)
c13ffa62 1720 return -ENOTCONN;
e90bac06 1721
94122bbe
MM		 1722 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1723 return 0;
1724
18a48e76
MM		 1725 while (chan->tx_send_head &&
1726 chan->unacked_frames < chan->remote_tx_win &&
1727 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1728
18a48e76 1729 skb = chan->tx_send_head;
e90bac06 1730
18a48e76
MM		 1731 bt_cb(skb)->control.retries = 1;
1732 control = &bt_cb(skb)->control;
95ffa978 1733
e2ab4353 1734 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1735 control->final = 1;
e2ab4353 1736
18a48e76
MM		 1737 control->reqseq = chan->buffer_seq;
1738 chan->last_acked_seq = chan->buffer_seq;
1739 control->txseq = chan->next_tx_seq;
1c2acffb 1740
18a48e76 1741 __pack_control(chan, control, skb);
e90bac06 1742
47d1ec61 1743 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1744 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1745 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1746 }
1747
18a48e76
MM		 1748 /* Clone after data has been modified. Data is assumed to be
1749 read-only (for locking purposes) on cloned sk_buffs.
1750 */
1751 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1752
18a48e76
MM		 1753 if (!tx_skb)
1754 break;
1c2acffb 1755
18a48e76 1756 __set_retrans_timer(chan);
836be934
AE		 1757
1758 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1759 chan->unacked_frames++;
6a026610 1760 chan->frames_sent++;
18a48e76 1761 sent++;
1c2acffb 1762
58d35f87
GP		 1763 if (skb_queue_is_last(&chan->tx_q, skb))
1764 chan->tx_send_head = NULL;
1c2acffb 1765 else
58d35f87 1766 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1767
1768 l2cap_do_send(chan, tx_skb);
b4400672 1769 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1770 }
1771
b4400672
AE		 1772 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1773 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1774
1775 return sent;
9e917af1
GP		 1776}
1777
e1fbd4c1
MM		 1778static void l2cap_ertm_resend(struct l2cap_chan *chan)
1779{
1780 struct l2cap_ctrl control;
1781 struct sk_buff *skb;
1782 struct sk_buff *tx_skb;
1783 u16 seq;
1784
1785 BT_DBG("chan %p", chan);
1786
1787 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1788 return;
1789
1790 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1791 seq = l2cap_seq_list_pop(&chan->retrans_list);
1792
1793 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1794 if (!skb) {
1795 BT_DBG("Error: Can't retransmit seq %d, frame missing",
1796 seq);
1797 continue;
1798 }
1799
1800 bt_cb(skb)->control.retries++;
1801 control = bt_cb(skb)->control;
1802
1803 if (chan->max_tx != 0 &&
1804 bt_cb(skb)->control.retries > chan->max_tx) {
1805 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
1806 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
1807 l2cap_seq_list_clear(&chan->retrans_list);
1808 break;
1809 }
1810
1811 control.reqseq = chan->buffer_seq;
1812 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1813 control.final = 1;
1814 else
1815 control.final = 0;
1816
1817 if (skb_cloned(skb)) {
1818 /* Cloned sk_buffs are read-only, so we need a
1819 * writeable copy
1820 */
1821 tx_skb = skb_copy(skb, GFP_ATOMIC);
1822 } else {
1823 tx_skb = skb_clone(skb, GFP_ATOMIC);
1824 }
1825
1826 if (!tx_skb) {
1827 l2cap_seq_list_clear(&chan->retrans_list);
1828 break;
1829 }
1830
1831 /* Update skb contents */
1832 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1833 put_unaligned_le32(__pack_extended_control(&control),
1834 tx_skb->data + L2CAP_HDR_SIZE);
1835 } else {
1836 put_unaligned_le16(__pack_enhanced_control(&control),
1837 tx_skb->data + L2CAP_HDR_SIZE);
1838 }
1839
1840 if (chan->fcs == L2CAP_FCS_CRC16) {
1841 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
1842 put_unaligned_le16(fcs, skb_put(tx_skb,
1843 L2CAP_FCS_SIZE));
1844 }
1845
1846 l2cap_do_send(chan, tx_skb);
1847
1848 BT_DBG("Resent txseq %d", control.txseq);
1849
1850 chan->last_acked_seq = chan->buffer_seq;
1851 }
1852}
1853
f80842a8
MM		 1854static void l2cap_retransmit(struct l2cap_chan *chan,
1855 struct l2cap_ctrl *control)
1856{
1857 BT_DBG("chan %p, control %p", chan, control);
1858
1859 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
1860 l2cap_ertm_resend(chan);
1861}
1862
d2a7ac5d
MM		 1863static void l2cap_retransmit_all(struct l2cap_chan *chan,
1864 struct l2cap_ctrl *control)
1865{
e1fbd4c1
MM		 1866 struct sk_buff *skb;
1867
1868 BT_DBG("chan %p, control %p", chan, control);
1869
1870 if (control->poll)
1871 set_bit(CONN_SEND_FBIT, &chan->conn_state);
1872
1873 l2cap_seq_list_clear(&chan->retrans_list);
1874
1875 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1876 return;
1877
1878 if (chan->unacked_frames) {
1879 skb_queue_walk(&chan->tx_q, skb) {
1880 if (bt_cb(skb)->control.txseq == control->reqseq ||
1881 skb == chan->tx_send_head)
1882 break;
1883 }
1884
1885 skb_queue_walk_from(&chan->tx_q, skb) {
1886 if (skb == chan->tx_send_head)
1887 break;
1888
1889 l2cap_seq_list_append(&chan->retrans_list,
1890 bt_cb(skb)->control.txseq);
1891 }
1892
1893 l2cap_ertm_resend(chan);
1894 }
d2a7ac5d
MM		 1895}
1896
0a0aba42 1897static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 1898{
0a0aba42
MM		 1899 struct l2cap_ctrl control;
1900 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
1901 chan->last_acked_seq);
1902 int threshold;
9e917af1 1903
0a0aba42
MM		 1904 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
1905 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 1906
0a0aba42
MM		 1907 memset(&control, 0, sizeof(control));
1908 control.sframe = 1;
dfc909be 1909
0a0aba42
MM		 1910 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
1911 chan->rx_state == L2CAP_RX_STATE_RECV) {
1912 __clear_ack_timer(chan);
1913 control.super = L2CAP_SUPER_RNR;
1914 control.reqseq = chan->buffer_seq;
1915 l2cap_send_sframe(chan, &control);
1916 } else {
1917 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
1918 l2cap_ertm_send(chan);
1919 /* If any i-frames were sent, they included an ack */
1920 if (chan->buffer_seq == chan->last_acked_seq)
1921 frames_to_ack = 0;
1922 }
dfc909be 1923
c20f8e35 1924 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 1925 * Calculate without mul or div
1926 */
c20f8e35 1927 threshold = chan->ack_win;
0a0aba42
MM		 1928 threshold += threshold << 1;
1929 threshold >>= 2;
1930
b4400672 1931 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 1932 threshold);
1933
1934 if (frames_to_ack >= threshold) {
1935 __clear_ack_timer(chan);
1936 control.super = L2CAP_SUPER_RR;
1937 control.reqseq = chan->buffer_seq;
1938 l2cap_send_sframe(chan, &control);
1939 frames_to_ack = 0;
1940 }
1c2acffb 1941
0a0aba42
MM		 1942 if (frames_to_ack)
1943 __set_ack_timer(chan);
1944 }
b17e73bb
SJ		 1945}
1946
04124681
GP		 1947static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
1948 struct msghdr *msg, int len,
1949 int count, struct sk_buff *skb)
1c2acffb 1950{
0952a57a 1951 struct l2cap_conn *conn = chan->conn;
1c2acffb 1952 struct sk_buff **frag;
90338947 1953 int sent = 0;
1da177e4 1954
59203a21 1955 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1956 return -EFAULT;
1da177e4
LT		 1957
1958 sent += count;
1959 len -= count;
1960
1961 /* Continuation fragments (no L2CAP header) */
1962 frag = &skb_shinfo(skb)->frag_list;
1963 while (len) {
fbe00700
GP		 1964 struct sk_buff *tmp;
1965
1da177e4
LT		 1966 count = min_t(unsigned int, conn->mtu, len);
1967
fbe00700
GP		 1968 tmp = chan->ops->alloc_skb(chan, count,
1969 msg->msg_flags & MSG_DONTWAIT);
1970 if (IS_ERR(tmp))
1971 return PTR_ERR(tmp);
1972
1973 *frag = tmp;
2f7719ce 1974
1c2acffb
GP		 1975 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1976 return -EFAULT;
1da177e4 1977
5e59b791
LAD		 1978 (*frag)->priority = skb->priority;
1979
1da177e4
LT		 1980 sent += count;
1981 len -= count;
1982
2d0ed3d5
GP		 1983 skb->len += (*frag)->len;
1984 skb->data_len += (*frag)->len;
1985
1da177e4
LT		 1986 frag = &(*frag)->next;
1987 }
1da177e4
LT		 1988
1989 return sent;
1c2acffb 1990}
1da177e4 1991
5e59b791 1992static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 1993 struct msghdr *msg, size_t len,
1994 u32 priority)
1c2acffb 1995{
8c1d787b 1996 struct l2cap_conn *conn = chan->conn;
1c2acffb 1997 struct sk_buff *skb;
03a51213 1998 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 1999 struct l2cap_hdr *lh;
2000
b4400672 2001 BT_DBG("chan %p len %zu priority %u", chan, len, priority);
1c2acffb
GP		 2002
2003 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2004
2005 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2006 msg->msg_flags & MSG_DONTWAIT);
2007 if (IS_ERR(skb))
2008 return skb;
1c2acffb 2009
5e59b791
LAD		 2010 skb->priority = priority;
2011
1c2acffb
GP		 2012 /* Create L2CAP header */
2013 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2014 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c
AE		 2015 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2016 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2017
0952a57a 2018 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2019 if (unlikely(err < 0)) {
2020 kfree_skb(skb);
2021 return ERR_PTR(err);
2022 }
2023 return skb;
2024}
2025
5e59b791 2026static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2027 struct msghdr *msg, size_t len,
2028 u32 priority)
1c2acffb 2029{
8c1d787b 2030 struct l2cap_conn *conn = chan->conn;
1c2acffb 2031 struct sk_buff *skb;
f2ba7fae 2032 int err, count;
1c2acffb
GP		 2033 struct l2cap_hdr *lh;
2034
b4400672 2035 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2036
f2ba7fae 2037 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2038
f2ba7fae 2039 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2040 msg->msg_flags & MSG_DONTWAIT);
2041 if (IS_ERR(skb))
2042 return skb;
1c2acffb 2043
5e59b791
LAD		 2044 skb->priority = priority;
2045
1c2acffb
GP		 2046 /* Create L2CAP header */
2047 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2048 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2049 lh->len = cpu_to_le16(len);
1c2acffb 2050
0952a57a 2051 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2052 if (unlikely(err < 0)) {
2053 kfree_skb(skb);
2054 return ERR_PTR(err);
2055 }
2056 return skb;
2057}
2058
ab0ff76d 2059static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2060 struct msghdr *msg, size_t len,
2061 u16 sdulen)
1c2acffb 2062{
8c1d787b 2063 struct l2cap_conn *conn = chan->conn;
1c2acffb 2064 struct sk_buff *skb;
e4ca6d98 2065 int err, count, hlen;
1c2acffb
GP		 2066 struct l2cap_hdr *lh;
2067
b4400672 2068 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2069
0ee0d208
GP		 2070 if (!conn)
2071 return ERR_PTR(-ENOTCONN);
2072
ba7aa64f 2073 hlen = __ertm_hdr_size(chan);
e4ca6d98 2074
c74e560c 2075 if (sdulen)
03a51213 2076 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2077
47d1ec61 2078 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2079 hlen += L2CAP_FCS_SIZE;
fcc203c3 2080
1c2acffb 2081 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2082
2083 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2084 msg->msg_flags & MSG_DONTWAIT);
2085 if (IS_ERR(skb))
2086 return skb;
1c2acffb
GP		 2087
2088 /* Create L2CAP header */
2089 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2090 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2091 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2092
18a48e76
MM		 2093 /* Control header is populated later */
2094 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2095 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2096 else
2097 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2098
c74e560c 2099 if (sdulen)
03a51213 2100 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2101
0952a57a 2102 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2103 if (unlikely(err < 0)) {
2104 kfree_skb(skb);
2105 return ERR_PTR(err);
2106 }
e90bac06 2107
18a48e76 2108 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2109 bt_cb(skb)->control.retries = 0;
1c2acffb 2110 return skb;
1da177e4
LT		 2111}
2112
94122bbe
MM		 2113static int l2cap_segment_sdu(struct l2cap_chan *chan,
2114 struct sk_buff_head *seg_queue,
2115 struct msghdr *msg, size_t len)
c74e560c 2116{
c74e560c 2117 struct sk_buff *skb;
94122bbe
MM		 2118 u16 sdu_len;
2119 size_t pdu_len;
94122bbe 2120 u8 sar;
c74e560c 2121
b4400672 2122 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2123
94122bbe
MM		 2124 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2125 * so fragmented skbs are not used. The HCI layer's handling
2126 * of fragmented skbs is not compatible with ERTM's queueing.
2127 */
c74e560c 2128
94122bbe
MM		 2129 /* PDU size is derived from the HCI MTU */
2130 pdu_len = chan->conn->mtu;
c74e560c 2131
94122bbe
MM		 2132 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2133
2134 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2135 if (chan->fcs)
2136 pdu_len -= L2CAP_FCS_SIZE;
2137
ba7aa64f 2138 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2139
2140 /* Remote device may have requested smaller PDUs */
2141 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2142
2143 if (len <= pdu_len) {
2144 sar = L2CAP_SAR_UNSEGMENTED;
2145 sdu_len = 0;
2146 pdu_len = len;
2147 } else {
2148 sar = L2CAP_SAR_START;
2149 sdu_len = len;
2150 pdu_len -= L2CAP_SDULEN_SIZE;
2151 }
2152
2153 while (len > 0) {
2154 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2155
c74e560c 2156 if (IS_ERR(skb)) {
94122bbe 2157 __skb_queue_purge(seg_queue);
c74e560c
GP		 2158 return PTR_ERR(skb);
2159 }
2160
94122bbe
MM		 2161 bt_cb(skb)->control.sar = sar;
2162 __skb_queue_tail(seg_queue, skb);
2163
2164 len -= pdu_len;
2165 if (sdu_len) {
2166 sdu_len = 0;
2167 pdu_len += L2CAP_SDULEN_SIZE;
2168 }
2169
2170 if (len <= pdu_len) {
2171 sar = L2CAP_SAR_END;
2172 pdu_len = len;
2173 } else {
2174 sar = L2CAP_SAR_CONTINUE;
2175 }
c74e560c 2176 }
c74e560c 2177
f0f62799 2178 return 0;
c74e560c
GP		 2179}
2180
5e59b791
LAD		 2181int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2182 u32 priority)
9a91a04a 2183{
9a91a04a 2184 struct sk_buff *skb;
9a91a04a 2185 int err;
94122bbe 2186 struct sk_buff_head seg_queue;
9a91a04a
GP		 2187
2188 /* Connectionless channel */
715ec005 2189 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2190 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2191 if (IS_ERR(skb))
2192 return PTR_ERR(skb);
2193
2194 l2cap_do_send(chan, skb);
2195 return len;
2196 }
2197
2198 switch (chan->mode) {
2199 case L2CAP_MODE_BASIC:
2200 /* Check outgoing MTU */
2201 if (len > chan->omtu)
2202 return -EMSGSIZE;
2203
2204 /* Create a basic PDU */
5e59b791 2205 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2206 if (IS_ERR(skb))
2207 return PTR_ERR(skb);
2208
2209 l2cap_do_send(chan, skb);
2210 err = len;
2211 break;
2212
2213 case L2CAP_MODE_ERTM:
2214 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2215 /* Check outgoing MTU */
2216 if (len > chan->omtu) {
2217 err = -EMSGSIZE;
2218 break;
2219 }
9a91a04a 2220
94122bbe 2221 __skb_queue_head_init(&seg_queue);
9a91a04a 2222
94122bbe
MM		 2223 /* Do segmentation before calling in to the state machine,
2224 * since it's possible to block while waiting for memory
2225 * allocation.
2226 */
2227 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2228
94122bbe
MM		 2229 /* The channel could have been closed while segmenting,
2230 * check that it is still connected.
2231 */
2232 if (chan->state != BT_CONNECTED) {
2233 __skb_queue_purge(&seg_queue);
2234 err = -ENOTCONN;
9a91a04a
GP		 2235 }
2236
94122bbe 2237 if (err)
9a91a04a 2238 break;
9a91a04a 2239
3733937d 2240 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2241 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2242 else
d660366d 2243 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2244
d660366d 2245 err = len;
9a91a04a 2246
94122bbe
MM		 2247 /* If the skbs were not queued for sending, they'll still be in
2248 * seg_queue and need to be purged.
2249 */
2250 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2251 break;
2252
2253 default:
2254 BT_DBG("bad state %1.1x", chan->mode);
2255 err = -EBADFD;
2256 }
2257
2258 return err;
2259}
2260
d2a7ac5d
MM		 2261static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2262{
bed68bde
MM		 2263 struct l2cap_ctrl control;
2264 u16 seq;
2265
b4400672 2266 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2267
2268 memset(&control, 0, sizeof(control));
2269 control.sframe = 1;
2270 control.super = L2CAP_SUPER_SREJ;
2271
2272 for (seq = chan->expected_tx_seq; seq != txseq;
2273 seq = __next_seq(chan, seq)) {
2274 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2275 control.reqseq = seq;
2276 l2cap_send_sframe(chan, &control);
2277 l2cap_seq_list_append(&chan->srej_list, seq);
2278 }
2279 }
2280
2281 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2282}
2283
2284static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2285{
bed68bde
MM		 2286 struct l2cap_ctrl control;
2287
2288 BT_DBG("chan %p", chan);
2289
2290 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2291 return;
2292
2293 memset(&control, 0, sizeof(control));
2294 control.sframe = 1;
2295 control.super = L2CAP_SUPER_SREJ;
2296 control.reqseq = chan->srej_list.tail;
2297 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2298}
2299
2300static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2301{
bed68bde
MM		 2302 struct l2cap_ctrl control;
2303 u16 initial_head;
2304 u16 seq;
2305
b4400672 2306 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2307
2308 memset(&control, 0, sizeof(control));
2309 control.sframe = 1;
2310 control.super = L2CAP_SUPER_SREJ;
2311
2312 /* Capture initial list head to allow only one pass through the list. */
2313 initial_head = chan->srej_list.head;
2314
2315 do {
2316 seq = l2cap_seq_list_pop(&chan->srej_list);
2317 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2318 break;
2319
2320 control.reqseq = seq;
2321 l2cap_send_sframe(chan, &control);
2322 l2cap_seq_list_append(&chan->srej_list, seq);
2323 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2324}
2325
608bcc6d
MM		 2326static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2327{
2328 struct sk_buff *acked_skb;
2329 u16 ackseq;
2330
b4400672 2331 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2332
2333 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2334 return;
2335
b4400672 2336 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2337 chan->expected_ack_seq, chan->unacked_frames);
2338
2339 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2340 ackseq = __next_seq(chan, ackseq)) {
2341
2342 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2343 if (acked_skb) {
2344 skb_unlink(acked_skb, &chan->tx_q);
2345 kfree_skb(acked_skb);
2346 chan->unacked_frames--;
2347 }
2348 }
2349
2350 chan->expected_ack_seq = reqseq;
2351
2352 if (chan->unacked_frames == 0)
2353 __clear_retrans_timer(chan);
2354
b4400672 2355 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2356}
2357
2358static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2359{
2360 BT_DBG("chan %p", chan);
2361
2362 chan->expected_tx_seq = chan->buffer_seq;
2363 l2cap_seq_list_clear(&chan->srej_list);
2364 skb_queue_purge(&chan->srej_q);
2365 chan->rx_state = L2CAP_RX_STATE_RECV;
2366}
2367
d660366d
GP		 2368static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2369 struct l2cap_ctrl *control,
2370 struct sk_buff_head *skbs, u8 event)
608bcc6d 2371{
608bcc6d
MM		 2372 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2373 event);
2374
2375 switch (event) {
2376 case L2CAP_EV_DATA_REQUEST:
2377 if (chan->tx_send_head == NULL)
2378 chan->tx_send_head = skb_peek(skbs);
2379
2380 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2381 l2cap_ertm_send(chan);
2382 break;
2383 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2384 BT_DBG("Enter LOCAL_BUSY");
2385 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2386
2387 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2388 /* The SREJ_SENT state must be aborted if we are to
2389 * enter the LOCAL_BUSY state.
2390 */
2391 l2cap_abort_rx_srej_sent(chan);
2392 }
2393
2394 l2cap_send_ack(chan);
2395
2396 break;
2397 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2398 BT_DBG("Exit LOCAL_BUSY");
2399 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2400
2401 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2402 struct l2cap_ctrl local_control;
2403
2404 memset(&local_control, 0, sizeof(local_control));
2405 local_control.sframe = 1;
2406 local_control.super = L2CAP_SUPER_RR;
2407 local_control.poll = 1;
2408 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2409 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2410
2411 chan->retry_count = 1;
2412 __set_monitor_timer(chan);
2413 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2414 }
2415 break;
2416 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2417 l2cap_process_reqseq(chan, control->reqseq);
2418 break;
2419 case L2CAP_EV_EXPLICIT_POLL:
2420 l2cap_send_rr_or_rnr(chan, 1);
2421 chan->retry_count = 1;
2422 __set_monitor_timer(chan);
2423 __clear_ack_timer(chan);
2424 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2425 break;
2426 case L2CAP_EV_RETRANS_TO:
2427 l2cap_send_rr_or_rnr(chan, 1);
2428 chan->retry_count = 1;
2429 __set_monitor_timer(chan);
2430 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2431 break;
2432 case L2CAP_EV_RECV_FBIT:
2433 /* Nothing to process */
2434 break;
2435 default:
2436 break;
2437 }
608bcc6d
MM		 2438}
2439
d660366d
GP		 2440static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2441 struct l2cap_ctrl *control,
2442 struct sk_buff_head *skbs, u8 event)
608bcc6d 2443{
608bcc6d
MM		 2444 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2445 event);
2446
2447 switch (event) {
2448 case L2CAP_EV_DATA_REQUEST:
2449 if (chan->tx_send_head == NULL)
2450 chan->tx_send_head = skb_peek(skbs);
2451 /* Queue data, but don't send. */
2452 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2453 break;
2454 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2455 BT_DBG("Enter LOCAL_BUSY");
2456 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2457
2458 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2459 /* The SREJ_SENT state must be aborted if we are to
2460 * enter the LOCAL_BUSY state.
2461 */
2462 l2cap_abort_rx_srej_sent(chan);
2463 }
2464
2465 l2cap_send_ack(chan);
2466
2467 break;
2468 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2469 BT_DBG("Exit LOCAL_BUSY");
2470 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2471
2472 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2473 struct l2cap_ctrl local_control;
2474 memset(&local_control, 0, sizeof(local_control));
2475 local_control.sframe = 1;
2476 local_control.super = L2CAP_SUPER_RR;
2477 local_control.poll = 1;
2478 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2479 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2480
2481 chan->retry_count = 1;
2482 __set_monitor_timer(chan);
2483 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2484 }
2485 break;
2486 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2487 l2cap_process_reqseq(chan, control->reqseq);
2488
2489 /* Fall through */
2490
2491 case L2CAP_EV_RECV_FBIT:
2492 if (control && control->final) {
2493 __clear_monitor_timer(chan);
2494 if (chan->unacked_frames > 0)
2495 __set_retrans_timer(chan);
2496 chan->retry_count = 0;
2497 chan->tx_state = L2CAP_TX_STATE_XMIT;
2498 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2499 }
2500 break;
2501 case L2CAP_EV_EXPLICIT_POLL:
2502 /* Ignore */
2503 break;
2504 case L2CAP_EV_MONITOR_TO:
2505 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2506 l2cap_send_rr_or_rnr(chan, 1);
2507 __set_monitor_timer(chan);
2508 chan->retry_count++;
2509 } else {
2510 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
2511 }
2512 break;
2513 default:
2514 break;
2515 }
608bcc6d
MM		 2516}
2517
d660366d
GP		 2518static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2519 struct sk_buff_head *skbs, u8 event)
608bcc6d 2520{
608bcc6d
MM		 2521 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2522 chan, control, skbs, event, chan->tx_state);
2523
2524 switch (chan->tx_state) {
2525 case L2CAP_TX_STATE_XMIT:
d660366d 2526 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2527 break;
2528 case L2CAP_TX_STATE_WAIT_F:
d660366d 2529 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2530 break;
2531 default:
2532 /* Ignore event */
2533 break;
2534 }
608bcc6d
MM		 2535}
2536
4b51dae9
MM		 2537static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2538 struct l2cap_ctrl *control)
2539{
2540 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2541 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2542}
2543
f80842a8
MM		 2544static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2545 struct l2cap_ctrl *control)
2546{
2547 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2548 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2549}
2550
1da177e4
LT		 2551/* Copy frame to all raw sockets on that connection */
2552static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2553{
1da177e4 2554 struct sk_buff *nskb;
48454079 2555 struct l2cap_chan *chan;
1da177e4
LT		 2556
2557 BT_DBG("conn %p", conn);
2558
3df91ea2 2559 mutex_lock(&conn->chan_lock);
3d57dc68 2560
3df91ea2 2561 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2562 struct sock *sk = chan->sk;
715ec005 2563 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2564 continue;
2565
2566 /* Don't send frame to the socket it came from */
2567 if (skb->sk == sk)
2568 continue;
af05b30b
GP		 2569 nskb = skb_clone(skb, GFP_ATOMIC);
2570 if (!nskb)
1da177e4
LT		 2571 continue;
2572
80b98027 2573 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2574 kfree_skb(nskb);
2575 }
3d57dc68 2576
3df91ea2 2577 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2578}
2579
2580/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2581static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2582 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2583{
2584 struct sk_buff *skb, **frag;
2585 struct l2cap_cmd_hdr *cmd;
2586 struct l2cap_hdr *lh;
2587 int len, count;
2588
b4400672
AE		 2589 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2590 conn, code, ident, dlen);
1da177e4
LT		 2591
2592 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2593 count = min_t(unsigned int, conn->mtu, len);
2594
2595 skb = bt_skb_alloc(count, GFP_ATOMIC);
2596 if (!skb)
2597 return NULL;
2598
2599 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2600 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2601
2602 if (conn->hcon->type == LE_LINK)
ac73498c 2603 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2604 else
ac73498c 2605 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2606
2607 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2608 cmd->code = code;
2609 cmd->ident = ident;
aca3192c 2610 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2611
2612 if (dlen) {
2613 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2614 memcpy(skb_put(skb, count), data, count);
2615 data += count;
2616 }
2617
2618 len -= skb->len;
2619
2620 /* Continuation fragments (no L2CAP header) */
2621 frag = &skb_shinfo(skb)->frag_list;
2622 while (len) {
2623 count = min_t(unsigned int, conn->mtu, len);
2624
2625 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2626 if (!*frag)
2627 goto fail;
2628
2629 memcpy(skb_put(*frag, count), data, count);
2630
2631 len -= count;
2632 data += count;
2633
2634 frag = &(*frag)->next;
2635 }
2636
2637 return skb;
2638
2639fail:
2640 kfree_skb(skb);
2641 return NULL;
2642}
2643
2644static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2645{
2646 struct l2cap_conf_opt *opt = *ptr;
2647 int len;
2648
2649 len = L2CAP_CONF_OPT_SIZE + opt->len;
2650 *ptr += len;
2651
2652 *type = opt->type;
2653 *olen = opt->len;
2654
2655 switch (opt->len) {
2656 case 1:
2657 *val = *((u8 *) opt->val);
2658 break;
2659
2660 case 2:
bfaaeb3e 2661 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2662 break;
2663
2664 case 4:
bfaaeb3e 2665 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2666 break;
2667
2668 default:
2669 *val = (unsigned long) opt->val;
2670 break;
2671 }
2672
b4400672 2673 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2674 return len;
2675}
2676
1da177e4
LT		 2677static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2678{
2679 struct l2cap_conf_opt *opt = *ptr;
2680
b4400672 2681 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2682
2683 opt->type = type;
2684 opt->len = len;
2685
2686 switch (len) {
2687 case 1:
2688 *((u8 *) opt->val) = val;
2689 break;
2690
2691 case 2:
4f8b691c 2692 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2693 break;
2694
2695 case 4:
4f8b691c 2696 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2697 break;
2698
2699 default:
2700 memcpy(opt->val, (void *) val, len);
2701 break;
2702 }
2703
2704 *ptr += L2CAP_CONF_OPT_SIZE + len;
2705}
2706
f89cef09
AE		 2707static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2708{
2709 struct l2cap_conf_efs efs;
2710
1ec918ce 2711 switch (chan->mode) {
f89cef09
AE		 2712 case L2CAP_MODE_ERTM:
2713 efs.id = chan->local_id;
2714 efs.stype = chan->local_stype;
2715 efs.msdu = cpu_to_le16(chan->local_msdu);
2716 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c
AE		 2717 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2718 efs.flush_to = __constant_cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO);
f89cef09
AE		 2719 break;
2720
2721 case L2CAP_MODE_STREAMING:
2722 efs.id = 1;
2723 efs.stype = L2CAP_SERV_BESTEFFORT;
2724 efs.msdu = cpu_to_le16(chan->local_msdu);
2725 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2726 efs.acc_lat = 0;
2727 efs.flush_to = 0;
2728 break;
2729
2730 default:
2731 return;
2732 }
2733
2734 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
2735 (unsigned long) &efs);
2736}
2737
721c4181 2738static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 2739{
721c4181 2740 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 2741 ack_timer.work);
2742 u16 frames_to_ack;
c1b4f43b 2743
2fb9b3d4
GP		 2744 BT_DBG("chan %p", chan);
2745
6be36555
AE		 2746 l2cap_chan_lock(chan);
2747
0362520b
MM		 2748 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2749 chan->last_acked_seq);
6be36555 2750
0362520b
MM		 2751 if (frames_to_ack)
2752 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 2753
0362520b 2754 l2cap_chan_unlock(chan);
09bfb2ee 2755 l2cap_chan_put(chan);
c1b4f43b
GP		 2756}
2757
466f8004 2758int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 2759{
3c588192
MM		 2760 int err;
2761
105bdf9e
MM		 2762 chan->next_tx_seq = 0;
2763 chan->expected_tx_seq = 0;
42e5c802 2764 chan->expected_ack_seq = 0;
6a026610 2765 chan->unacked_frames = 0;
42e5c802 2766 chan->buffer_seq = 0;
6a026610 2767 chan->frames_sent = 0;
105bdf9e
MM		 2768 chan->last_acked_seq = 0;
2769 chan->sdu = NULL;
2770 chan->sdu_last_frag = NULL;
2771 chan->sdu_len = 0;
2772
d34c34fb
MM		 2773 skb_queue_head_init(&chan->tx_q);
2774
105bdf9e
MM		 2775 if (chan->mode != L2CAP_MODE_ERTM)
2776 return 0;
2777
2778 chan->rx_state = L2CAP_RX_STATE_RECV;
2779 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 2780
721c4181
GP		 2781 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2782 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2783 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 2784
f1c6775b 2785 skb_queue_head_init(&chan->srej_q);
1890d36b 2786
3c588192
MM		 2787 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
2788 if (err < 0)
2789 return err;
2790
9dc9affc
MM		 2791 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
2792 if (err < 0)
2793 l2cap_seq_list_free(&chan->srej_list);
2794
2795 return err;
0565c1c2
GP		 2796}
2797
f2fcfcd6
GP		 2798static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2799{
2800 switch (mode) {
2801 case L2CAP_MODE_STREAMING:
2802 case L2CAP_MODE_ERTM:
2803 if (l2cap_mode_supported(mode, remote_feat_mask))
2804 return mode;
2805 /* fall through */
2806 default:
2807 return L2CAP_MODE_BASIC;
2808 }
2809}
2810
6327eb98
AE		 2811static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2812{
2813 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2814}
2815
f89cef09
AE		 2816static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2817{
2818 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2819}
2820
6327eb98
AE		 2821static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
2822{
2823 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
836be934 2824 __l2cap_ews_supported(chan)) {
6327eb98
AE		 2825 /* use extended control field */
2826 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 2827 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
2828 } else {
6327eb98
AE		 2829 chan->tx_win = min_t(u16, chan->tx_win,
2830 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 2831 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
2832 }
c20f8e35 2833 chan->ack_win = chan->tx_win;
6327eb98
AE		 2834}
2835
710f9b0a 2836static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2837{
1da177e4 2838 struct l2cap_conf_req *req = data;
0c1bc5c6 2839 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 2840 void *ptr = req->data;
c8f79162 2841 u16 size;
1da177e4 2842
49208c9c 2843 BT_DBG("chan %p", chan);
1da177e4 2844
73ffa904 2845 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 2846 goto done;
2847
0c1bc5c6 2848 switch (chan->mode) {
f2fcfcd6
GP		 2849 case L2CAP_MODE_STREAMING:
2850 case L2CAP_MODE_ERTM:
c1360a1c 2851 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 2852 break;
85eb53c6 2853
f89cef09
AE		 2854 if (__l2cap_efs_supported(chan))
2855 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2856
2ba13ed6 2857 /* fall through */
f2fcfcd6 2858 default:
8c1d787b 2859 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 2860 break;
2861 }
2862
2863done:
0c1bc5c6
GP		 2864 if (chan->imtu != L2CAP_DEFAULT_MTU)
2865 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 2866
0c1bc5c6 2867 switch (chan->mode) {
65c7c491 2868 case L2CAP_MODE_BASIC:
8c1d787b
GP		 2869 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2870 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 2871 break;
2872
62547752
GP		 2873 rfc.mode = L2CAP_MODE_BASIC;
2874 rfc.txwin_size = 0;
2875 rfc.max_transmit = 0;
2876 rfc.retrans_timeout = 0;
2877 rfc.monitor_timeout = 0;
2878 rfc.max_pdu_size = 0;
2879
63406504
GP		 2880 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2881 (unsigned long) &rfc);
65c7c491
MH		 2882 break;
2883
2884 case L2CAP_MODE_ERTM:
2885 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 2886 rfc.max_transmit = chan->max_tx;
f2fcfcd6
GP		 2887 rfc.retrans_timeout = 0;
2888 rfc.monitor_timeout = 0;
c8f79162
AE		 2889
2890 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2891 L2CAP_EXT_HDR_SIZE -
2892 L2CAP_SDULEN_SIZE -
2893 L2CAP_FCS_SIZE);
2894 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 2895
6327eb98
AE		 2896 l2cap_txwin_setup(chan);
2897
2898 rfc.txwin_size = min_t(u16, chan->tx_win,
2899 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 2900
63406504
GP		 2901 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2902 (unsigned long) &rfc);
2903
f89cef09
AE		 2904 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2905 l2cap_add_opt_efs(&ptr, chan);
2906
8c1d787b 2907 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2908 break;
2909
47d1ec61 2910 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2911 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2912 chan->fcs = L2CAP_FCS_NONE;
2913 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2914 }
6327eb98
AE		 2915
2916 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2917 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2918 chan->tx_win);
f2fcfcd6
GP		 2919 break;
2920
2921 case L2CAP_MODE_STREAMING:
273759e2 2922 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 2923 rfc.mode = L2CAP_MODE_STREAMING;
2924 rfc.txwin_size = 0;
2925 rfc.max_transmit = 0;
2926 rfc.retrans_timeout = 0;
2927 rfc.monitor_timeout = 0;
c8f79162
AE		 2928
2929 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2930 L2CAP_EXT_HDR_SIZE -
2931 L2CAP_SDULEN_SIZE -
2932 L2CAP_FCS_SIZE);
2933 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 2934
63406504
GP		 2935 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2936 (unsigned long) &rfc);
2937
f89cef09
AE		 2938 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2939 l2cap_add_opt_efs(&ptr, chan);
2940
8c1d787b 2941 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2942 break;
2943
47d1ec61 2944 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2945 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2946 chan->fcs = L2CAP_FCS_NONE;
2947 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2948 }
65c7c491
MH		 2949 break;
2950 }
1da177e4 2951
fe4128e0 2952 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 2953 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 2954
2955 return ptr - data;
2956}
2957
73ffa904 2958static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2959{
5dee9e7c
MH		 2960 struct l2cap_conf_rsp *rsp = data;
2961 void *ptr = rsp->data;
73ffa904
GP		 2962 void *req = chan->conf_req;
2963 int len = chan->conf_len;
5dee9e7c
MH		 2964 int type, hint, olen;
2965 unsigned long val;
6464f35f 2966 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 2967 struct l2cap_conf_efs efs;
2968 u8 remote_efs = 0;
861d6882 2969 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2970 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 2971 u16 size;
1da177e4 2972
73ffa904 2973 BT_DBG("chan %p", chan);
820ae1b8 2974
5dee9e7c
MH		 2975 while (len >= L2CAP_CONF_OPT_SIZE) {
2976 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2977
589d2746 2978 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2979 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2980
2981 switch (type) {
2982 case L2CAP_CONF_MTU:
861d6882 2983 mtu = val;
5dee9e7c
MH		 2984 break;
2985
2986 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2987 chan->flush_to = val;
5dee9e7c
MH		 2988 break;
2989
2990 case L2CAP_CONF_QOS:
2991 break;
2992
6464f35f
MH		 2993 case L2CAP_CONF_RFC:
2994 if (olen == sizeof(rfc))
2995 memcpy(&rfc, (void *) val, olen);
2996 break;
2997
fcc203c3
GP		 2998 case L2CAP_CONF_FCS:
2999 if (val == L2CAP_FCS_NONE)
c1360a1c 3000 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 3001 break;
fcc203c3 3002
42dceae2
AE		 3003 case L2CAP_CONF_EFS:
3004 remote_efs = 1;
3005 if (olen == sizeof(efs))
3006 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3007 break;
3008
6327eb98
AE		 3009 case L2CAP_CONF_EWS:
3010 if (!enable_hs)
3011 return -ECONNREFUSED;
fcc203c3 3012
6327eb98
AE		 3013 set_bit(FLAG_EXT_CTRL, &chan->flags);
3014 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3015 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3016 chan->remote_tx_win = val;
fcc203c3
GP		 3017 break;
3018
5dee9e7c
MH		 3019 default:
3020 if (hint)
3021 break;
3022
3023 result = L2CAP_CONF_UNKNOWN;
3024 *((u8 *) ptr++) = type;
3025 break;
3026 }
3027 }
3028
73ffa904 3029 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3030 goto done;
3031
0c1bc5c6 3032 switch (chan->mode) {
f2fcfcd6
GP		 3033 case L2CAP_MODE_STREAMING:
3034 case L2CAP_MODE_ERTM:
c1360a1c 3035 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3036 chan->mode = l2cap_select_mode(rfc.mode,
8c1d787b 3037 chan->conn->feat_mask);
85eb53c6
GP		 3038 break;
3039 }
3040
42dceae2
AE		 3041 if (remote_efs) {
3042 if (__l2cap_efs_supported(chan))
3043 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3044 else
3045 return -ECONNREFUSED;
3046 }
3047
0c1bc5c6 3048 if (chan->mode != rfc.mode)
f2fcfcd6 3049 return -ECONNREFUSED;
742e519b 3050
f2fcfcd6 3051 break;
f2fcfcd6
GP		 3052 }
3053
3054done:
0c1bc5c6 3055 if (chan->mode != rfc.mode) {
f2fcfcd6 3056 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3057 rfc.mode = chan->mode;
f2fcfcd6 3058
73ffa904 3059 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3060 return -ECONNREFUSED;
3061
3062 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3063 sizeof(rfc), (unsigned long) &rfc);
3064 }
3065
5dee9e7c
MH		 3066 if (result == L2CAP_CONF_SUCCESS) {
3067 /* Configure output options and let the other side know
3068 * which ones we don't like. */
3069
f2fcfcd6
GP		 3070 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3071 result = L2CAP_CONF_UNACCEPT;
3072 else {
0c1bc5c6 3073 chan->omtu = mtu;
c1360a1c 3074 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3075 }
0c1bc5c6 3076 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3077
42dceae2
AE		 3078 if (remote_efs) {
3079 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3080 efs.stype != L2CAP_SERV_NOTRAFIC &&
3081 efs.stype != chan->local_stype) {
3082
3083 result = L2CAP_CONF_UNACCEPT;
3084
3085 if (chan->num_conf_req >= 1)
3086 return -ECONNREFUSED;
3087
3088 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3e6b3b95 3089 sizeof(efs),
42dceae2 3090 (unsigned long) &efs);
0e8b207e 3091 } else {
3e6b3b95 3092 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3093 result = L2CAP_CONF_PENDING;
3094 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3095 }
3096 }
3097
f2fcfcd6
GP		 3098 switch (rfc.mode) {
3099 case L2CAP_MODE_BASIC:
47d1ec61 3100 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3101 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3102 break;
3103
3104 case L2CAP_MODE_ERTM:
6327eb98
AE		 3105 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3106 chan->remote_tx_win = rfc.txwin_size;
3107 else
3108 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3109
2c03a7a4 3110 chan->remote_max_tx = rfc.max_transmit;
1c762159 3111
c8f79162
AE		 3112 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3113 chan->conn->mtu -
3114 L2CAP_EXT_HDR_SIZE -
3115 L2CAP_SDULEN_SIZE -
3116 L2CAP_FCS_SIZE);
3117 rfc.max_pdu_size = cpu_to_le16(size);
3118 chan->remote_mps = size;
f2fcfcd6 3119
10467e9e 3120 rfc.retrans_timeout =
4fd21a88 3121 __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
10467e9e 3122 rfc.monitor_timeout =
4fd21a88 3123 __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6 3124
c1360a1c 3125 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3126
3127 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3128 sizeof(rfc), (unsigned long) &rfc);
3129
42dceae2
AE		 3130 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3131 chan->remote_id = efs.id;
3132 chan->remote_stype = efs.stype;
3133 chan->remote_msdu = le16_to_cpu(efs.msdu);
3134 chan->remote_flush_to =
3135 le32_to_cpu(efs.flush_to);
3136 chan->remote_acc_lat =
3137 le32_to_cpu(efs.acc_lat);
3138 chan->remote_sdu_itime =
3139 le32_to_cpu(efs.sdu_itime);
3140 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3141 sizeof(efs), (unsigned long) &efs);
3142 }
f2fcfcd6
GP		 3143 break;
3144
3145 case L2CAP_MODE_STREAMING:
c8f79162
AE		 3146 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3147 chan->conn->mtu -
3148 L2CAP_EXT_HDR_SIZE -
3149 L2CAP_SDULEN_SIZE -
3150 L2CAP_FCS_SIZE);
3151 rfc.max_pdu_size = cpu_to_le16(size);
3152 chan->remote_mps = size;
f2fcfcd6 3153
c1360a1c 3154 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3155
3156 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3157 sizeof(rfc), (unsigned long) &rfc);
3158
f2fcfcd6
GP		 3159 break;
3160
3161 default:
5dee9e7c 3162 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3163
6464f35f 3164 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3165 rfc.mode = chan->mode;
f2fcfcd6 3166 }
6464f35f 3167
f2fcfcd6 3168 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3169 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3170 }
fe4128e0 3171 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3172 rsp->result = cpu_to_le16(result);
59e54bd1 3173 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3174
3175 return ptr - data;
1da177e4
LT		 3176}
3177
b4450035 3178static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
f2fcfcd6 3179{
f2fcfcd6
GP		 3180 struct l2cap_conf_req *req = data;
3181 void *ptr = req->data;
3182 int type, olen;
3183 unsigned long val;
36e999a8 3184 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3185 struct l2cap_conf_efs efs;
f2fcfcd6 3186
fe4128e0 3187 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3188
3189 while (len >= L2CAP_CONF_OPT_SIZE) {
3190 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3191
3192 switch (type) {
3193 case L2CAP_CONF_MTU:
3194 if (val < L2CAP_DEFAULT_MIN_MTU) {
3195 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3196 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3197 } else
0c1bc5c6
GP		 3198 chan->imtu = val;
3199 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3200 break;
3201
3202 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3203 chan->flush_to = val;
f2fcfcd6 3204 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
0c1bc5c6 3205 2, chan->flush_to);
f2fcfcd6
GP		 3206 break;
3207
3208 case L2CAP_CONF_RFC:
3209 if (olen == sizeof(rfc))
3210 memcpy(&rfc, (void *)val, olen);
3211
c1360a1c 3212 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
0c1bc5c6 3213 rfc.mode != chan->mode)
f2fcfcd6
GP		 3214 return -ECONNREFUSED;
3215
47d1ec61 3216 chan->fcs = 0;
f2fcfcd6
GP		 3217
3218 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3219 sizeof(rfc), (unsigned long) &rfc);
3220 break;
6327eb98
AE		 3221
3222 case L2CAP_CONF_EWS:
c20f8e35 3223 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3224 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3225 chan->tx_win);
6327eb98 3226 break;
66af7aaf
AE		 3227
3228 case L2CAP_CONF_EFS:
3229 if (olen == sizeof(efs))
3230 memcpy(&efs, (void *)val, olen);
3231
3232 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3233 efs.stype != L2CAP_SERV_NOTRAFIC &&
3234 efs.stype != chan->local_stype)
3235 return -ECONNREFUSED;
3236
3237 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3238 sizeof(efs), (unsigned long) &efs);
3239 break;
f2fcfcd6
GP		 3240 }
3241 }
3242
0c1bc5c6 3243 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3244 return -ECONNREFUSED;
3245
0c1bc5c6 3246 chan->mode = rfc.mode;
6c2ea7a8 3247
0e8b207e 3248 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3249 switch (rfc.mode) {
3250 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3251 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3252 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3253 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3254 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3255 chan->ack_win = min_t(u16, chan->ack_win,
3256 rfc.txwin_size);
66af7aaf
AE		 3257
3258 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3259 chan->local_msdu = le16_to_cpu(efs.msdu);
3260 chan->local_sdu_itime =
3261 le32_to_cpu(efs.sdu_itime);
3262 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3263 chan->local_flush_to =
3264 le32_to_cpu(efs.flush_to);
3265 }
f2fcfcd6 3266 break;
66af7aaf 3267
f2fcfcd6 3268 case L2CAP_MODE_STREAMING:
47d1ec61 3269 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3270 }
3271 }
3272
fe4128e0 3273 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3274 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3275
3276 return ptr - data;
3277}
3278
fe4128e0 3279static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1da177e4
LT		 3280{
3281 struct l2cap_conf_rsp *rsp = data;
3282 void *ptr = rsp->data;
1da177e4 3283
fe4128e0 3284 BT_DBG("chan %p", chan);
1da177e4 3285
fe4128e0 3286 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3287 rsp->result = cpu_to_le16(result);
aca3192c 3288 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3289
3290 return ptr - data;
3291}
3292
8c1d787b 3293void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3294{
3295 struct l2cap_conn_rsp rsp;
8c1d787b 3296 struct l2cap_conn *conn = chan->conn;
710f9b0a
GP		 3297 u8 buf[128];
3298
fe4128e0
GP		 3299 rsp.scid = cpu_to_le16(chan->dcid);
3300 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3301 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3302 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
710f9b0a
GP		 3303 l2cap_send_cmd(conn, chan->ident,
3304 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
3305
c1360a1c 3306 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3307 return;
3308
710f9b0a
GP		 3309 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3310 l2cap_build_conf_req(chan, buf), buf);
3311 chan->num_conf_req++;
3312}
3313
47d1ec61 3314static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3315{
7b1c0049
GP		 3316 int type, olen;
3317 unsigned long val;
c20f8e35
MM		 3318 /* Use sane default values in case a misbehaving remote device
3319 * did not send an RFC or extended window size option.
3320 */
3321 u16 txwin_ext = chan->ack_win;
3322 struct l2cap_conf_rfc rfc = {
3323 .mode = chan->mode,
3324 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3325 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3326 .max_pdu_size = cpu_to_le16(chan->imtu),
3327 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3328 };
7b1c0049 3329
47d1ec61 3330 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3331
0c1bc5c6 3332 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3333 return;
3334
3335 while (len >= L2CAP_CONF_OPT_SIZE) {
3336 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3337
c20f8e35
MM		 3338 switch (type) {
3339 case L2CAP_CONF_RFC:
3340 if (olen == sizeof(rfc))
3341 memcpy(&rfc, (void *)val, olen);
8f321f85 3342 break;
c20f8e35
MM		 3343 case L2CAP_CONF_EWS:
3344 txwin_ext = val;
3345 break;
3346 }
7b1c0049
GP		 3347 }
3348
7b1c0049
GP		 3349 switch (rfc.mode) {
3350 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3351 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3352 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3353 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3354 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3355 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3356 else
3357 chan->ack_win = min_t(u16, chan->ack_win,
3358 rfc.txwin_size);
7b1c0049
GP		 3359 break;
3360 case L2CAP_MODE_STREAMING:
47d1ec61 3361 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3362 }
3363}
3364
4e8402a3
MH		 3365static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3366{
e2fd318e 3367 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3368
e2fd318e 3369 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3370 return 0;
3371
3372 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
3373 cmd->ident == conn->info_ident) {
17cd3f37 3374 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3375
3376 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3377 conn->info_ident = 0;
984947dc 3378
4e8402a3
MH		 3379 l2cap_conn_start(conn);
3380 }
3381
3382 return 0;
3383}
3384
1da177e4
LT		 3385static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3386{
1da177e4
LT		 3387 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3388 struct l2cap_conn_rsp rsp;
23691d75 3389 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3390 struct sock *parent, *sk = NULL;
e7c29cb1 3391 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3392
3393 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3394 __le16 psm = req->psm;
1da177e4 3395
097db76c 3396 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3397
3398 /* Check if we have socket listening on psm */
c2287681 3399 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 3400 if (!pchan) {
1da177e4
LT		 3401 result = L2CAP_CR_BAD_PSM;
3402 goto sendresp;
3403 }
3404
23691d75
GP		 3405 parent = pchan->sk;
3406
3df91ea2 3407 mutex_lock(&conn->chan_lock);
aa2ac881 3408 lock_sock(parent);
e0f0cb56 3409
e7c29cb1 3410 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3411 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
e7c29cb1 3412 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3413 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3414 result = L2CAP_CR_SEC_BLOCK;
3415 goto response;
3416 }
3417
1da177e4
LT		 3418 result = L2CAP_CR_NO_MEM;
3419
2dfa1003
GP		 3420 /* Check if we already have channel with that dcid */
3421 if (__l2cap_get_chan_by_dcid(conn, scid))
3422 goto response;
3423
80b98027 3424 chan = pchan->ops->new_connection(pchan);
80808e43 3425 if (!chan)
1da177e4
LT		 3426 goto response;
3427
80808e43
GP		 3428 sk = chan->sk;
3429
1da177e4
LT		 3430 hci_conn_hold(conn->hcon);
3431
1da177e4
LT		 3432 bacpy(&bt_sk(sk)->src, conn->src);
3433 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3434 chan->psm = psm;
3435 chan->dcid = scid;
1da177e4 3436
d1010240
GP		 3437 bt_accept_enqueue(parent, sk);
3438
6be36555 3439 __l2cap_chan_add(conn, chan);
48454079 3440
fe4128e0 3441 dcid = chan->scid;
1da177e4 3442
c9b66675 3443 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3444
fc7f8a7e 3445 chan->ident = cmd->ident;
1da177e4 3446
984947dc 3447 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3448 if (l2cap_chan_check_security(chan)) {
c5daa683 3449 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
0e587be7 3450 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3451 result = L2CAP_CR_PEND;
3452 status = L2CAP_CS_AUTHOR_PEND;
3453 parent->sk_data_ready(parent, 0);
3454 } else {
0e587be7 3455 __l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 3456 result = L2CAP_CR_SUCCESS;
3457 status = L2CAP_CS_NO_INFO;
3458 }
79d554a6 3459 } else {
0e587be7 3460 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3461 result = L2CAP_CR_PEND;
3462 status = L2CAP_CS_AUTHEN_PEND;
3463 }
3464 } else {
0e587be7 3465 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3466 result = L2CAP_CR_PEND;
3467 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3468 }
3469
1da177e4 3470response:
aa2ac881 3471 release_sock(parent);
3df91ea2 3472 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3473
3474sendresp:
aca3192c
YH		 3475 rsp.scid = cpu_to_le16(scid);
3476 rsp.dcid = cpu_to_le16(dcid);
3477 rsp.result = cpu_to_le16(result);
3478 rsp.status = cpu_to_le16(status);
1da177e4 3479 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 3480
3481 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3482 struct l2cap_info_req info;
ac73498c 3483 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3484
3485 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3486 conn->info_ident = l2cap_get_ident(conn);
3487
ba13ccd9 3488 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6
MH		 3489
3490 l2cap_send_cmd(conn, conn->info_ident,
3491 L2CAP_INFO_REQ, sizeof(info), &info);
3492 }
3493
c1360a1c 3494 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
e9aeb2dd
GP		 3495 result == L2CAP_CR_SUCCESS) {
3496 u8 buf[128];
c1360a1c 3497 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3498 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3499 l2cap_build_conf_req(chan, buf), buf);
3500 chan->num_conf_req++;
e9aeb2dd
GP		 3501 }
3502
1da177e4
LT		 3503 return 0;
3504}
3505
3506static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3507{
3508 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3509 u16 scid, dcid, result, status;
48454079 3510 struct l2cap_chan *chan;
1da177e4 3511 u8 req[128];
3df91ea2 3512 int err;
1da177e4
LT		 3513
3514 scid = __le16_to_cpu(rsp->scid);
3515 dcid = __le16_to_cpu(rsp->dcid);
3516 result = __le16_to_cpu(rsp->result);
3517 status = __le16_to_cpu(rsp->status);
3518
1b009c98
AE		 3519 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3520 dcid, scid, result, status);
1da177e4 3521
3df91ea2
AE		 3522 mutex_lock(&conn->chan_lock);
3523
1da177e4 3524 if (scid) {
3df91ea2
AE		 3525 chan = __l2cap_get_chan_by_scid(conn, scid);
3526 if (!chan) {
3527 err = -EFAULT;
3528 goto unlock;
3529 }
1da177e4 3530 } else {
3df91ea2
AE		 3531 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3532 if (!chan) {
3533 err = -EFAULT;
3534 goto unlock;
3535 }
1da177e4
LT		 3536 }
3537
3df91ea2
AE		 3538 err = 0;
3539
6be36555 3540 l2cap_chan_lock(chan);
48454079 3541
1da177e4
LT		 3542 switch (result) {
3543 case L2CAP_CR_SUCCESS:
89bc500e 3544 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3545 chan->ident = 0;
fe4128e0 3546 chan->dcid = dcid;
c1360a1c 3547 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3548
c1360a1c 3549 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3550 break;
3551
1da177e4 3552 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3553 l2cap_build_conf_req(chan, req), req);
3554 chan->num_conf_req++;
1da177e4
LT		 3555 break;
3556
3557 case L2CAP_CR_PEND:
c1360a1c 3558 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3559 break;
3560
3561 default:
48454079 3562 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3563 break;
3564 }
3565
6be36555 3566 l2cap_chan_unlock(chan);
3df91ea2
AE		 3567
3568unlock:
3569 mutex_unlock(&conn->chan_lock);
3570
3571 return err;
1da177e4
LT		 3572}
3573
47d1ec61 3574static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3575{
3576 /* FCS is enabled only in ERTM or streaming mode, if one or both
3577 * sides request it.
3578 */
0c1bc5c6 3579 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3580 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3581 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 3582 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3583}
3584
88219a0f 3585static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3586{
3587 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3588 u16 dcid, flags;
3589 u8 rsp[64];
48454079 3590 struct l2cap_chan *chan;
3c588192 3591 int len, err = 0;
1da177e4
LT		 3592
3593 dcid = __le16_to_cpu(req->dcid);
3594 flags = __le16_to_cpu(req->flags);
3595
3596 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3597
baa7e1fa 3598 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3599 if (!chan)
1da177e4
LT		 3600 return -ENOENT;
3601
033b1142 3602 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3603 struct l2cap_cmd_rej_cid rej;
3604
ac73498c 3605 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
e2fd318e
IK		 3606 rej.scid = cpu_to_le16(chan->scid);
3607 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3608
df6bd743
GP		 3609 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
3610 sizeof(rej), &rej);
354f60a9 3611 goto unlock;
df6bd743 3612 }
354f60a9 3613
5dee9e7c 3614 /* Reject if config buffer is too small. */
88219a0f 3615 len = cmd_len - sizeof(*req);
7ac28817 3616 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3617 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 3618 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c
MH		 3619 L2CAP_CONF_REJECT, flags), rsp);
3620 goto unlock;
3621 }
3622
3623 /* Store config. */
73ffa904
GP		 3624 memcpy(chan->conf_req + chan->conf_len, req->data, len);
3625 chan->conf_len += len;
1da177e4 3626
59e54bd1 3627 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 3628 /* Incomplete config. Send empty response. */
3629 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 3630 l2cap_build_conf_rsp(chan, rsp,
5325e5bb 3631 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 3632 goto unlock;
3633 }
3634
3635 /* Complete config. */
73ffa904 3636 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 3637 if (len < 0) {
e92c8e70 3638 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 3639 goto unlock;
f2fcfcd6 3640 }
1da177e4 3641
5dee9e7c 3642 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 3643 chan->num_conf_rsp++;
5dee9e7c 3644
5dee9e7c 3645 /* Reset config buffer. */
73ffa904 3646 chan->conf_len = 0;
5dee9e7c 3647
c1360a1c 3648 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 3649 goto unlock;
3650
c1360a1c 3651 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 3652 set_default_fcs(chan);
fcc203c3 3653
105bdf9e
MM		 3654 if (chan->mode == L2CAP_MODE_ERTM ||
3655 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 3656 err = l2cap_ertm_init(chan);
3657
3658 if (err < 0)
3659 l2cap_send_disconn_req(chan->conn, chan, -err);
3660 else
3661 l2cap_chan_ready(chan);
0565c1c2 3662
876d9484
MH		 3663 goto unlock;
3664 }
3665
c1360a1c 3666 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 3667 u8 buf[64];
1da177e4 3668 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3669 l2cap_build_conf_req(chan, buf), buf);
3670 chan->num_conf_req++;
1da177e4
LT		 3671 }
3672
0e8b207e
AE		 3673 /* Got Conf Rsp PENDING from remote side and asume we sent
3674 Conf Rsp PENDING in the code above */
3675 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
3676 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3677
3678 /* check compatibility */
3679
3680 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3681 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3682
3683 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 3684 l2cap_build_conf_rsp(chan, rsp,
5325e5bb 3685 L2CAP_CONF_SUCCESS, flags), rsp);
0e8b207e
AE		 3686 }
3687
1da177e4 3688unlock:
6be36555 3689 l2cap_chan_unlock(chan);
3c588192 3690 return err;
1da177e4
LT		 3691}
3692
3693static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3694{
3695 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3696 u16 scid, flags, result;
48454079 3697 struct l2cap_chan *chan;
61386cba 3698 int len = le16_to_cpu(cmd->len) - sizeof(*rsp);
3c588192 3699 int err = 0;
1da177e4
LT		 3700
3701 scid = __le16_to_cpu(rsp->scid);
3702 flags = __le16_to_cpu(rsp->flags);
3703 result = __le16_to_cpu(rsp->result);
3704
61386cba
AE		 3705 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
3706 result, len);
1da177e4 3707
baa7e1fa 3708 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3709 if (!chan)
1da177e4
LT		 3710 return 0;
3711
3712 switch (result) {
3713 case L2CAP_CONF_SUCCESS:
47d1ec61 3714 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 3715 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 3716 break;
3717
0e8b207e
AE		 3718 case L2CAP_CONF_PENDING:
3719 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
3720
3721 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3722 char buf[64];
3723
3724 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
3725 buf, &result);
3726 if (len < 0) {
3727 l2cap_send_disconn_req(conn, chan, ECONNRESET);
3728 goto done;
3729 }
3730
3731 /* check compatibility */
3732
3733 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3734 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3735
3736 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 3737 l2cap_build_conf_rsp(chan, buf,
0e8b207e
AE		 3738 L2CAP_CONF_SUCCESS, 0x0000), buf);
3739 }
3740 goto done;
3741
1da177e4 3742 case L2CAP_CONF_UNACCEPT:
73ffa904 3743 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3744 char req[64];
3745
c2c77ec8 3746 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 3747 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 3748 goto done;
3749 }
3750
f2fcfcd6
GP		 3751 /* throw out any old stored conf requests */
3752 result = L2CAP_CONF_SUCCESS;
b4450035
GP		 3753 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
3754 req, &result);
f2fcfcd6 3755 if (len < 0) {
e92c8e70 3756 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 3757 goto done;
3758 }
3759
3760 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3761 L2CAP_CONF_REQ, len, req);
73ffa904 3762 chan->num_conf_req++;
f2fcfcd6
GP		 3763 if (result != L2CAP_CONF_SUCCESS)
3764 goto done;
3765 break;
1da177e4
LT		 3766 }
3767
8e87d142 3768 default:
6be36555 3769 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 3770
ba13ccd9 3771 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
e92c8e70 3772 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 3773 goto done;
3774 }
3775
59e54bd1 3776 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 3777 goto done;
3778
c1360a1c 3779 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 3780
c1360a1c 3781 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 3782 set_default_fcs(chan);
fcc203c3 3783
105bdf9e
MM		 3784 if (chan->mode == L2CAP_MODE_ERTM ||
3785 chan->mode == L2CAP_MODE_STREAMING)
3c588192 3786 err = l2cap_ertm_init(chan);
0565c1c2 3787
3c588192
MM		 3788 if (err < 0)
3789 l2cap_send_disconn_req(chan->conn, chan, -err);
3790 else
3791 l2cap_chan_ready(chan);
1da177e4
LT		 3792 }
3793
3794done:
6be36555 3795 l2cap_chan_unlock(chan);
3c588192 3796 return err;
1da177e4
LT		 3797}
3798
3799static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3800{
3801 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3802 struct l2cap_disconn_rsp rsp;
3803 u16 dcid, scid;
48454079 3804 struct l2cap_chan *chan;
1da177e4
LT		 3805 struct sock *sk;
3806
3807 scid = __le16_to_cpu(req->scid);
3808 dcid = __le16_to_cpu(req->dcid);
3809
3810 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3811
3df91ea2
AE		 3812 mutex_lock(&conn->chan_lock);
3813
3814 chan = __l2cap_get_chan_by_scid(conn, dcid);
3815 if (!chan) {
3816 mutex_unlock(&conn->chan_lock);
1da177e4 3817 return 0;
3df91ea2 3818 }
1da177e4 3819
6be36555
AE		 3820 l2cap_chan_lock(chan);
3821
48454079
GP		 3822 sk = chan->sk;
3823
fe4128e0
GP		 3824 rsp.dcid = cpu_to_le16(chan->scid);
3825 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 3826 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3827
6be36555 3828 lock_sock(sk);
1da177e4 3829 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 3830 release_sock(sk);
1da177e4 3831
61d6ef3e 3832 l2cap_chan_hold(chan);
48454079 3833 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 3834
3835 l2cap_chan_unlock(chan);
1da177e4 3836
80b98027 3837 chan->ops->close(chan);
61d6ef3e 3838 l2cap_chan_put(chan);
3df91ea2
AE		 3839
3840 mutex_unlock(&conn->chan_lock);
3841
1da177e4
LT		 3842 return 0;
3843}
3844
3845static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3846{
3847 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3848 u16 dcid, scid;
48454079 3849 struct l2cap_chan *chan;
1da177e4
LT		 3850
3851 scid = __le16_to_cpu(rsp->scid);
3852 dcid = __le16_to_cpu(rsp->dcid);
3853
3854 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3855
3df91ea2
AE		 3856 mutex_lock(&conn->chan_lock);
3857
3858 chan = __l2cap_get_chan_by_scid(conn, scid);
3859 if (!chan) {
3860 mutex_unlock(&conn->chan_lock);
1da177e4 3861 return 0;
3df91ea2 3862 }
1da177e4 3863
6be36555 3864 l2cap_chan_lock(chan);
48454079 3865
61d6ef3e 3866 l2cap_chan_hold(chan);
48454079 3867 l2cap_chan_del(chan, 0);
6be36555
AE		 3868
3869 l2cap_chan_unlock(chan);
1da177e4 3870
80b98027 3871 chan->ops->close(chan);
61d6ef3e 3872 l2cap_chan_put(chan);
3df91ea2
AE		 3873
3874 mutex_unlock(&conn->chan_lock);
3875
1da177e4
LT		 3876 return 0;
3877}
3878
3879static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3880{
3881 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3882 u16 type;
3883
3884 type = __le16_to_cpu(req->type);
3885
3886 BT_DBG("type 0x%4.4x", type);
3887
f0709e03
MH		 3888 if (type == L2CAP_IT_FEAT_MASK) {
3889 u8 buf[8];
44dd46de 3890 u32 feat_mask = l2cap_feat_mask;
f0709e03 3891 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 3892 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
3893 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3894 if (!disable_ertm)
fcc203c3
GP		 3895 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3896 | L2CAP_FEAT_FCS;
a5fd6f30 3897 if (enable_hs)
6327eb98
AE		 3898 feat_mask |= L2CAP_FEAT_EXT_FLOW
3899 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 3900
1b7bf4ed 3901 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3902 l2cap_send_cmd(conn, cmd->ident,
3903 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3904 } else if (type == L2CAP_IT_FIXED_CHAN) {
3905 u8 buf[12];
3906 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 3907
3908 if (enable_hs)
3909 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
3910 else
3911 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
3912
ac73498c
AE		 3913 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3914 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 3915 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
e1027a7c
MH		 3916 l2cap_send_cmd(conn, cmd->ident,
3917 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3918 } else {
3919 struct l2cap_info_rsp rsp;
3920 rsp.type = cpu_to_le16(type);
ac73498c 3921 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
f0709e03
MH		 3922 l2cap_send_cmd(conn, cmd->ident,
3923 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3924 }
1da177e4
LT		 3925
3926 return 0;
3927}
3928
3929static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3930{
3931 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3932 u16 type, result;
3933
3934 type = __le16_to_cpu(rsp->type);
3935 result = __le16_to_cpu(rsp->result);
3936
3937 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3938
e90165be
AE		 3939 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
3940 if (cmd->ident != conn->info_ident ||
3941 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
3942 return 0;
3943
17cd3f37 3944 cancel_delayed_work(&conn->info_timer);
4e8402a3 3945
adb08ede
VT		 3946 if (result != L2CAP_IR_SUCCESS) {
3947 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3948 conn->info_ident = 0;
3949
3950 l2cap_conn_start(conn);
3951
3952 return 0;
3953 }
3954
978c93b9
AE		 3955 switch (type) {
3956 case L2CAP_IT_FEAT_MASK:
83985319 3957 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3958
47ec1dcd 3959 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 3960 struct l2cap_info_req req;
ac73498c 3961 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 3962
3963 conn->info_ident = l2cap_get_ident(conn);
3964
3965 l2cap_send_cmd(conn, conn->info_ident,
3966 L2CAP_INFO_REQ, sizeof(req), &req);
3967 } else {
3968 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3969 conn->info_ident = 0;
3970
3971 l2cap_conn_start(conn);
3972 }
978c93b9
AE		 3973 break;
3974
3975 case L2CAP_IT_FIXED_CHAN:
3976 conn->fixed_chan_mask = rsp->data[0];
984947dc 3977 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3978 conn->info_ident = 0;
984947dc
MH		 3979
3980 l2cap_conn_start(conn);
978c93b9 3981 break;
984947dc 3982 }
4e8402a3 3983
1da177e4
LT		 3984 return 0;
3985}
3986
f94ff6ff
MM		 3987static inline int l2cap_create_channel_req(struct l2cap_conn *conn,
3988 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3989 void *data)
3990{
3991 struct l2cap_create_chan_req *req = data;
3992 struct l2cap_create_chan_rsp rsp;
3993 u16 psm, scid;
3994
3995 if (cmd_len != sizeof(*req))
3996 return -EPROTO;
3997
3998 if (!enable_hs)
3999 return -EINVAL;
4000
4001 psm = le16_to_cpu(req->psm);
4002 scid = le16_to_cpu(req->scid);
4003
ad0ac6ca 4004 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff
MM		 4005
4006 /* Placeholder: Always reject */
4007 rsp.dcid = 0;
4008 rsp.scid = cpu_to_le16(scid);
8ce0c498
AE		 4009 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4010 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f94ff6ff
MM		 4011
4012 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4013 sizeof(rsp), &rsp);
4014
4015 return 0;
4016}
4017
4018static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn,
4019 struct l2cap_cmd_hdr *cmd, void *data)
4020{
4021 BT_DBG("conn %p", conn);
4022
4023 return l2cap_connect_rsp(conn, cmd, data);
4024}
4025
8d5a04a1 4026static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4027 u16 icid, u16 result)
8d5a04a1
MM		 4028{
4029 struct l2cap_move_chan_rsp rsp;
4030
ad0ac6ca 4031 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1
MM		 4032
4033 rsp.icid = cpu_to_le16(icid);
4034 rsp.result = cpu_to_le16(result);
4035
4036 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
4037}
4038
4039static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn,
ad0ac6ca
AE		 4040 struct l2cap_chan *chan,
4041 u16 icid, u16 result)
8d5a04a1
MM		 4042{
4043 struct l2cap_move_chan_cfm cfm;
4044 u8 ident;
4045
ad0ac6ca 4046 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1
MM		 4047
4048 ident = l2cap_get_ident(conn);
4049 if (chan)
4050 chan->ident = ident;
4051
4052 cfm.icid = cpu_to_le16(icid);
4053 cfm.result = cpu_to_le16(result);
4054
4055 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm);
4056}
4057
4058static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4059 u16 icid)
8d5a04a1
MM		 4060{
4061 struct l2cap_move_chan_cfm_rsp rsp;
4062
ad0ac6ca 4063 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4064
4065 rsp.icid = cpu_to_le16(icid);
4066 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4067}
4068
4069static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4070 struct l2cap_cmd_hdr *cmd,
4071 u16 cmd_len, void *data)
8d5a04a1
MM		 4072{
4073 struct l2cap_move_chan_req *req = data;
4074 u16 icid = 0;
4075 u16 result = L2CAP_MR_NOT_ALLOWED;
4076
4077 if (cmd_len != sizeof(*req))
4078 return -EPROTO;
4079
4080 icid = le16_to_cpu(req->icid);
4081
ad0ac6ca 4082 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1
MM		 4083
4084 if (!enable_hs)
4085 return -EINVAL;
4086
4087 /* Placeholder: Always refuse */
4088 l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
4089
4090 return 0;
4091}
4092
4093static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 4094 struct l2cap_cmd_hdr *cmd,
4095 u16 cmd_len, void *data)
8d5a04a1
MM		 4096{
4097 struct l2cap_move_chan_rsp *rsp = data;
4098 u16 icid, result;
4099
4100 if (cmd_len != sizeof(*rsp))
4101 return -EPROTO;
4102
4103 icid = le16_to_cpu(rsp->icid);
4104 result = le16_to_cpu(rsp->result);
4105
ad0ac6ca 4106 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1
MM		 4107
4108 /* Placeholder: Always unconfirmed */
4109 l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED);
4110
4111 return 0;
4112}
4113
4114static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
ad0ac6ca
AE		 4115 struct l2cap_cmd_hdr *cmd,
4116 u16 cmd_len, void *data)
8d5a04a1
MM		 4117{
4118 struct l2cap_move_chan_cfm *cfm = data;
4119 u16 icid, result;
4120
4121 if (cmd_len != sizeof(*cfm))
4122 return -EPROTO;
4123
4124 icid = le16_to_cpu(cfm->icid);
4125 result = le16_to_cpu(cfm->result);
4126
ad0ac6ca 4127 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1
MM		 4128
4129 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4130
4131 return 0;
4132}
4133
4134static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 4135 struct l2cap_cmd_hdr *cmd,
4136 u16 cmd_len, void *data)
8d5a04a1
MM		 4137{
4138 struct l2cap_move_chan_cfm_rsp *rsp = data;
4139 u16 icid;
4140
4141 if (cmd_len != sizeof(*rsp))
4142 return -EPROTO;
4143
4144 icid = le16_to_cpu(rsp->icid);
4145
ad0ac6ca 4146 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4147
4148 return 0;
4149}
4150
e2174ca4 4151static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
de73115a
CT		 4152 u16 to_multiplier)
4153{
4154 u16 max_latency;
4155
4156 if (min > max || min < 6 || max > 3200)
4157 return -EINVAL;
4158
4159 if (to_multiplier < 10 || to_multiplier > 3200)
4160 return -EINVAL;
4161
4162 if (max >= to_multiplier * 8)
4163 return -EINVAL;
4164
4165 max_latency = (to_multiplier * 8 / max) - 1;
4166 if (latency > 499 || latency > max_latency)
4167 return -EINVAL;
4168
4169 return 0;
4170}
4171
4172static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
4173 struct l2cap_cmd_hdr *cmd, u8 *data)
4174{
4175 struct hci_conn *hcon = conn->hcon;
4176 struct l2cap_conn_param_update_req *req;
4177 struct l2cap_conn_param_update_rsp rsp;
4178 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 4179 int err;
de73115a
CT		 4180
4181 if (!(hcon->link_mode & HCI_LM_MASTER))
4182 return -EINVAL;
4183
4184 cmd_len = __le16_to_cpu(cmd->len);
4185 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
4186 return -EPROTO;
4187
4188 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 4189 min = __le16_to_cpu(req->min);
4190 max = __le16_to_cpu(req->max);
de73115a
CT		 4191 latency = __le16_to_cpu(req->latency);
4192 to_multiplier = __le16_to_cpu(req->to_multiplier);
4193
4194 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
4195 min, max, latency, to_multiplier);
4196
4197 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 4198
4199 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
4200 if (err)
ac73498c 4201 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 4202 else
ac73498c 4203 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 4204
4205 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
4206 sizeof(rsp), &rsp);
4207
2ce603eb
CT		 4208 if (!err)
4209 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
4210
de73115a
CT		 4211 return 0;
4212}
4213
3300d9a9
CT		 4214static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
4215 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4216{
4217 int err = 0;
4218
4219 switch (cmd->code) {
4220 case L2CAP_COMMAND_REJ:
4221 l2cap_command_rej(conn, cmd, data);
4222 break;
4223
4224 case L2CAP_CONN_REQ:
4225 err = l2cap_connect_req(conn, cmd, data);
4226 break;
4227
4228 case L2CAP_CONN_RSP:
4229 err = l2cap_connect_rsp(conn, cmd, data);
4230 break;
4231
4232 case L2CAP_CONF_REQ:
4233 err = l2cap_config_req(conn, cmd, cmd_len, data);
4234 break;
4235
4236 case L2CAP_CONF_RSP:
4237 err = l2cap_config_rsp(conn, cmd, data);
4238 break;
4239
4240 case L2CAP_DISCONN_REQ:
4241 err = l2cap_disconnect_req(conn, cmd, data);
4242 break;
4243
4244 case L2CAP_DISCONN_RSP:
4245 err = l2cap_disconnect_rsp(conn, cmd, data);
4246 break;
4247
4248 case L2CAP_ECHO_REQ:
4249 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
4250 break;
4251
4252 case L2CAP_ECHO_RSP:
4253 break;
4254
4255 case L2CAP_INFO_REQ:
4256 err = l2cap_information_req(conn, cmd, data);
4257 break;
4258
4259 case L2CAP_INFO_RSP:
4260 err = l2cap_information_rsp(conn, cmd, data);
4261 break;
4262
f94ff6ff
MM		 4263 case L2CAP_CREATE_CHAN_REQ:
4264 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
4265 break;
4266
4267 case L2CAP_CREATE_CHAN_RSP:
4268 err = l2cap_create_channel_rsp(conn, cmd, data);
4269 break;
4270
8d5a04a1
MM		 4271 case L2CAP_MOVE_CHAN_REQ:
4272 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
4273 break;
4274
4275 case L2CAP_MOVE_CHAN_RSP:
4276 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
4277 break;
4278
4279 case L2CAP_MOVE_CHAN_CFM:
4280 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
4281 break;
4282
4283 case L2CAP_MOVE_CHAN_CFM_RSP:
4284 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
4285 break;
4286
3300d9a9
CT		 4287 default:
4288 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
4289 err = -EINVAL;
4290 break;
4291 }
4292
4293 return err;
4294}
4295
4296static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
4297 struct l2cap_cmd_hdr *cmd, u8 *data)
4298{
4299 switch (cmd->code) {
4300 case L2CAP_COMMAND_REJ:
4301 return 0;
4302
4303 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 4304 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 4305
4306 case L2CAP_CONN_PARAM_UPDATE_RSP:
4307 return 0;
4308
4309 default:
4310 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
4311 return -EINVAL;
4312 }
4313}
4314
4315static inline void l2cap_sig_channel(struct l2cap_conn *conn,
4316 struct sk_buff *skb)
1da177e4
LT		 4317{
4318 u8 *data = skb->data;
4319 int len = skb->len;
4320 struct l2cap_cmd_hdr cmd;
3300d9a9 4321 int err;
1da177e4
LT		 4322
4323 l2cap_raw_recv(conn, skb);
4324
4325 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 4326 u16 cmd_len;
1da177e4
LT		 4327 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
4328 data += L2CAP_CMD_HDR_SIZE;
4329 len -= L2CAP_CMD_HDR_SIZE;
4330
88219a0f 4331 cmd_len = le16_to_cpu(cmd.len);
1da177e4 4332
88219a0f 4333 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 4334
88219a0f 4335 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 4336 BT_DBG("corrupted command");
4337 break;
4338 }
4339
3300d9a9
CT		 4340 if (conn->hcon->type == LE_LINK)
4341 err = l2cap_le_sig_cmd(conn, &cmd, data);
4342 else
4343 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 4344
4345 if (err) {
e2fd318e 4346 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 4347
4348 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 4349
4350 /* FIXME: Map err to a valid reason */
ac73498c 4351 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
1da177e4
LT		 4352 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4353 }
4354
88219a0f
AV		 4355 data += cmd_len;
4356 len -= cmd_len;
1da177e4
LT		 4357 }
4358
4359 kfree_skb(skb);
4360}
4361
47d1ec61 4362static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 4363{
4364 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 4365 int hdr_size;
4366
4367 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
4368 hdr_size = L2CAP_EXT_HDR_SIZE;
4369 else
4370 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 4371
47d1ec61 4372 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 4373 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 4374 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
4375 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
4376
4377 if (our_fcs != rcv_fcs)
7a560e5c 4378 return -EBADMSG;
fcc203c3
GP		 4379 }
4380 return 0;
4381}
4382
6ea00485 4383static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 4384{
e31f7633 4385 struct l2cap_ctrl control;
d5392c8f 4386
e31f7633 4387 BT_DBG("chan %p", chan);
d5392c8f 4388
e31f7633
MM		 4389 memset(&control, 0, sizeof(control));
4390 control.sframe = 1;
4391 control.final = 1;
4392 control.reqseq = chan->buffer_seq;
4393 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 4394
e2ab4353 4395 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 4396 control.super = L2CAP_SUPER_RNR;
4397 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 4398 }
4399
e31f7633
MM		 4400 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
4401 chan->unacked_frames > 0)
4402 __set_retrans_timer(chan);
d5392c8f 4403
e31f7633 4404 /* Send pending iframes */
525cd185 4405 l2cap_ertm_send(chan);
d5392c8f 4406
e2ab4353 4407 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 4408 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
4409 /* F-bit wasn't sent in an s-frame or i-frame yet, so
4410 * send it now.
4411 */
4412 control.super = L2CAP_SUPER_RR;
4413 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 4414 }
4415}
4416
84084a31
MM		 4417static void append_skb_frag(struct sk_buff *skb,
4418 struct sk_buff *new_frag, struct sk_buff **last_frag)
18778a63 4419{
84084a31
MM		 4420 /* skb->len reflects data in skb as well as all fragments
4421 * skb->data_len reflects only data in fragments
4422 */
4423 if (!skb_has_frag_list(skb))
4424 skb_shinfo(skb)->frag_list = new_frag;
4425
4426 new_frag->next = NULL;
4427
4428 (*last_frag)->next = new_frag;
4429 *last_frag = new_frag;
4430
4431 skb->len += new_frag->len;
4432 skb->data_len += new_frag->len;
4433 skb->truesize += new_frag->truesize;
4434}
4435
4b51dae9
MM		 4436static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
4437 struct l2cap_ctrl *control)
84084a31
MM		 4438{
4439 int err = -EINVAL;
18778a63 4440
4b51dae9 4441 switch (control->sar) {
7e0ef6ee 4442 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 4443 if (chan->sdu)
4444 break;
18778a63 4445
80b98027 4446 err = chan->ops->recv(chan, skb);
84084a31 4447 break;
18778a63 4448
7e0ef6ee 4449 case L2CAP_SAR_START:
84084a31
MM		 4450 if (chan->sdu)
4451 break;
18778a63 4452
6f61fd47 4453 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 4454 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 4455
84084a31
MM		 4456 if (chan->sdu_len > chan->imtu) {
4457 err = -EMSGSIZE;
4458 break;
4459 }
1890d36b 4460
84084a31
MM		 4461 if (skb->len >= chan->sdu_len)
4462 break;
18778a63 4463
84084a31
MM		 4464 chan->sdu = skb;
4465 chan->sdu_last_frag = skb;
18778a63 4466
84084a31
MM		 4467 skb = NULL;
4468 err = 0;
18778a63
GP		 4469 break;
4470
7e0ef6ee 4471 case L2CAP_SAR_CONTINUE:
6f61fd47 4472 if (!chan->sdu)
84084a31 4473 break;
18778a63 4474
84084a31
MM		 4475 append_skb_frag(chan->sdu, skb,
4476 &chan->sdu_last_frag);
4477 skb = NULL;
18778a63 4478
84084a31
MM		 4479 if (chan->sdu->len >= chan->sdu_len)
4480 break;
4178ba46 4481
84084a31 4482 err = 0;
18778a63
GP		 4483 break;
4484
7e0ef6ee 4485 case L2CAP_SAR_END:
6f61fd47 4486 if (!chan->sdu)
84084a31 4487 break;
18778a63 4488
84084a31
MM		 4489 append_skb_frag(chan->sdu, skb,
4490 &chan->sdu_last_frag);
4491 skb = NULL;
4178ba46 4492
84084a31
MM		 4493 if (chan->sdu->len != chan->sdu_len)
4494 break;
18778a63 4495
80b98027 4496 err = chan->ops->recv(chan, chan->sdu);
1890d36b 4497
84084a31
MM		 4498 if (!err) {
4499 /* Reassembly complete */
4500 chan->sdu = NULL;
4501 chan->sdu_last_frag = NULL;
4502 chan->sdu_len = 0;
1890d36b 4503 }
18778a63
GP		 4504 break;
4505 }
4506
84084a31
MM		 4507 if (err) {
4508 kfree_skb(skb);
4509 kfree_skb(chan->sdu);
4510 chan->sdu = NULL;
4511 chan->sdu_last_frag = NULL;
4512 chan->sdu_len = 0;
4513 }
18778a63 4514
84084a31 4515 return err;
18778a63
GP		 4516}
4517
61aa4f5b 4518void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 4519{
61aa4f5b 4520 u8 event;
712132eb 4521
61aa4f5b
MM		 4522 if (chan->mode != L2CAP_MODE_ERTM)
4523 return;
712132eb 4524
61aa4f5b 4525 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 4526 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 4527}
4528
d2a7ac5d
MM		 4529static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
4530{
63838725
MM		 4531 int err = 0;
4532 /* Pass sequential frames to l2cap_reassemble_sdu()
4533 * until a gap is encountered.
4534 */
4535
4536 BT_DBG("chan %p", chan);
4537
4538 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4539 struct sk_buff *skb;
4540 BT_DBG("Searching for skb with txseq %d (queue len %d)",
4541 chan->buffer_seq, skb_queue_len(&chan->srej_q));
4542
4543 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
4544
4545 if (!skb)
4546 break;
4547
4548 skb_unlink(skb, &chan->srej_q);
4549 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
4550 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
4551 if (err)
4552 break;
4553 }
4554
4555 if (skb_queue_empty(&chan->srej_q)) {
4556 chan->rx_state = L2CAP_RX_STATE_RECV;
4557 l2cap_send_ack(chan);
4558 }
4559
4560 return err;
d2a7ac5d
MM		 4561}
4562
4563static void l2cap_handle_srej(struct l2cap_chan *chan,
4564 struct l2cap_ctrl *control)
4565{
f80842a8
MM		 4566 struct sk_buff *skb;
4567
4568 BT_DBG("chan %p, control %p", chan, control);
4569
4570 if (control->reqseq == chan->next_tx_seq) {
4571 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
4572 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4573 return;
4574 }
4575
4576 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
4577
4578 if (skb == NULL) {
4579 BT_DBG("Seq %d not available for retransmission",
4580 control->reqseq);
4581 return;
4582 }
4583
4584 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
4585 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
4586 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4587 return;
4588 }
4589
4590 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4591
4592 if (control->poll) {
4593 l2cap_pass_to_tx(chan, control);
4594
4595 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4596 l2cap_retransmit(chan, control);
4597 l2cap_ertm_send(chan);
4598
4599 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
4600 set_bit(CONN_SREJ_ACT, &chan->conn_state);
4601 chan->srej_save_reqseq = control->reqseq;
4602 }
4603 } else {
4604 l2cap_pass_to_tx_fbit(chan, control);
4605
4606 if (control->final) {
4607 if (chan->srej_save_reqseq != control->reqseq ||
4608 !test_and_clear_bit(CONN_SREJ_ACT,
4609 &chan->conn_state))
4610 l2cap_retransmit(chan, control);
4611 } else {
4612 l2cap_retransmit(chan, control);
4613 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
4614 set_bit(CONN_SREJ_ACT, &chan->conn_state);
4615 chan->srej_save_reqseq = control->reqseq;
4616 }
4617 }
4618 }
d2a7ac5d
MM		 4619}
4620
4621static void l2cap_handle_rej(struct l2cap_chan *chan,
4622 struct l2cap_ctrl *control)
4623{
fcd289df
MM		 4624 struct sk_buff *skb;
4625
4626 BT_DBG("chan %p, control %p", chan, control);
4627
4628 if (control->reqseq == chan->next_tx_seq) {
4629 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
4630 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4631 return;
4632 }
4633
4634 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
4635
4636 if (chan->max_tx && skb &&
4637 bt_cb(skb)->control.retries >= chan->max_tx) {
4638 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
4639 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4640 return;
4641 }
4642
4643 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4644
4645 l2cap_pass_to_tx(chan, control);
4646
4647 if (control->final) {
4648 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
4649 l2cap_retransmit_all(chan, control);
4650 } else {
4651 l2cap_retransmit_all(chan, control);
4652 l2cap_ertm_send(chan);
4653 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
4654 set_bit(CONN_REJ_ACT, &chan->conn_state);
4655 }
d2a7ac5d
MM		 4656}
4657
4b51dae9
MM		 4658static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
4659{
4660 BT_DBG("chan %p, txseq %d", chan, txseq);
4661
4662 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
4663 chan->expected_tx_seq);
4664
4665 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
4666 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
4667 chan->tx_win) {
4668 /* See notes below regarding "double poll" and
4669 * invalid packets.
4670 */
4671 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
4672 BT_DBG("Invalid/Ignore - after SREJ");
4673 return L2CAP_TXSEQ_INVALID_IGNORE;
4674 } else {
4675 BT_DBG("Invalid - in window after SREJ sent");
4676 return L2CAP_TXSEQ_INVALID;
4677 }
4678 }
4679
4680 if (chan->srej_list.head == txseq) {
4681 BT_DBG("Expected SREJ");
4682 return L2CAP_TXSEQ_EXPECTED_SREJ;
4683 }
4684
4685 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
4686 BT_DBG("Duplicate SREJ - txseq already stored");
4687 return L2CAP_TXSEQ_DUPLICATE_SREJ;
4688 }
4689
4690 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
4691 BT_DBG("Unexpected SREJ - not requested");
4692 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
4693 }
4694 }
4695
4696 if (chan->expected_tx_seq == txseq) {
4697 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
4698 chan->tx_win) {
4699 BT_DBG("Invalid - txseq outside tx window");
4700 return L2CAP_TXSEQ_INVALID;
4701 } else {
4702 BT_DBG("Expected");
4703 return L2CAP_TXSEQ_EXPECTED;
4704 }
4705 }
4706
4707 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
4708 __seq_offset(chan, chan->expected_tx_seq,
4709 chan->last_acked_seq)){
4710 BT_DBG("Duplicate - expected_tx_seq later than txseq");
4711 return L2CAP_TXSEQ_DUPLICATE;
4712 }
4713
4714 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
4715 /* A source of invalid packets is a "double poll" condition,
4716 * where delays cause us to send multiple poll packets. If
4717 * the remote stack receives and processes both polls,
4718 * sequence numbers can wrap around in such a way that a
4719 * resent frame has a sequence number that looks like new data
4720 * with a sequence gap. This would trigger an erroneous SREJ
4721 * request.
4722 *
4723 * Fortunately, this is impossible with a tx window that's
4724 * less than half of the maximum sequence number, which allows
4725 * invalid frames to be safely ignored.
4726 *
4727 * With tx window sizes greater than half of the tx window
4728 * maximum, the frame is invalid and cannot be ignored. This
4729 * causes a disconnect.
4730 */
4731
4732 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
4733 BT_DBG("Invalid/Ignore - txseq outside tx window");
4734 return L2CAP_TXSEQ_INVALID_IGNORE;
4735 } else {
4736 BT_DBG("Invalid - txseq outside tx window");
4737 return L2CAP_TXSEQ_INVALID;
4738 }
4739 } else {
4740 BT_DBG("Unexpected - txseq indicates missing frames");
4741 return L2CAP_TXSEQ_UNEXPECTED;
4742 }
4743}
4744
d2a7ac5d
MM		 4745static int l2cap_rx_state_recv(struct l2cap_chan *chan,
4746 struct l2cap_ctrl *control,
4747 struct sk_buff *skb, u8 event)
4748{
4749 int err = 0;
4750 bool skb_in_use = 0;
4751
4752 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
4753 event);
4754
4755 switch (event) {
4756 case L2CAP_EV_RECV_IFRAME:
4757 switch (l2cap_classify_txseq(chan, control->txseq)) {
4758 case L2CAP_TXSEQ_EXPECTED:
4759 l2cap_pass_to_tx(chan, control);
4760
4761 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4762 BT_DBG("Busy, discarding expected seq %d",
4763 control->txseq);
4764 break;
4765 }
4766
4767 chan->expected_tx_seq = __next_seq(chan,
4768 control->txseq);
4769
4770 chan->buffer_seq = chan->expected_tx_seq;
4771 skb_in_use = 1;
4772
4773 err = l2cap_reassemble_sdu(chan, skb, control);
4774 if (err)
4775 break;
4776
4777 if (control->final) {
4778 if (!test_and_clear_bit(CONN_REJ_ACT,
4779 &chan->conn_state)) {
4780 control->final = 0;
4781 l2cap_retransmit_all(chan, control);
4782 l2cap_ertm_send(chan);
4783 }
4784 }
4785
4786 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
4787 l2cap_send_ack(chan);
4788 break;
4789 case L2CAP_TXSEQ_UNEXPECTED:
4790 l2cap_pass_to_tx(chan, control);
4791
4792 /* Can't issue SREJ frames in the local busy state.
4793 * Drop this frame, it will be seen as missing
4794 * when local busy is exited.
4795 */
4796 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4797 BT_DBG("Busy, discarding unexpected seq %d",
4798 control->txseq);
4799 break;
4800 }
4801
4802 /* There was a gap in the sequence, so an SREJ
4803 * must be sent for each missing frame. The
4804 * current frame is stored for later use.
4805 */
4806 skb_queue_tail(&chan->srej_q, skb);
4807 skb_in_use = 1;
4808 BT_DBG("Queued %p (queue len %d)", skb,
4809 skb_queue_len(&chan->srej_q));
4810
4811 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
4812 l2cap_seq_list_clear(&chan->srej_list);
4813 l2cap_send_srej(chan, control->txseq);
4814
4815 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
4816 break;
4817 case L2CAP_TXSEQ_DUPLICATE:
4818 l2cap_pass_to_tx(chan, control);
4819 break;
4820 case L2CAP_TXSEQ_INVALID_IGNORE:
4821 break;
4822 case L2CAP_TXSEQ_INVALID:
4823 default:
4824 l2cap_send_disconn_req(chan->conn, chan,
4825 ECONNRESET);
4826 break;
4827 }
4828 break;
4829 case L2CAP_EV_RECV_RR:
4830 l2cap_pass_to_tx(chan, control);
4831 if (control->final) {
4832 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4833
4834 if (!test_and_clear_bit(CONN_REJ_ACT,
4835 &chan->conn_state)) {
4836 control->final = 0;
4837 l2cap_retransmit_all(chan, control);
4838 }
4839
4840 l2cap_ertm_send(chan);
4841 } else if (control->poll) {
4842 l2cap_send_i_or_rr_or_rnr(chan);
4843 } else {
4844 if (test_and_clear_bit(CONN_REMOTE_BUSY,
4845 &chan->conn_state) &&
4846 chan->unacked_frames)
4847 __set_retrans_timer(chan);
4848
4849 l2cap_ertm_send(chan);
4850 }
4851 break;
4852 case L2CAP_EV_RECV_RNR:
4853 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4854 l2cap_pass_to_tx(chan, control);
4855 if (control && control->poll) {
4856 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4857 l2cap_send_rr_or_rnr(chan, 0);
4858 }
4859 __clear_retrans_timer(chan);
4860 l2cap_seq_list_clear(&chan->retrans_list);
4861 break;
4862 case L2CAP_EV_RECV_REJ:
4863 l2cap_handle_rej(chan, control);
4864 break;
4865 case L2CAP_EV_RECV_SREJ:
4866 l2cap_handle_srej(chan, control);
4867 break;
4868 default:
4869 break;
4870 }
4871
4872 if (skb && !skb_in_use) {
4873 BT_DBG("Freeing %p", skb);
4874 kfree_skb(skb);
4875 }
4876
4877 return err;
4878}
4879
4880static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
4881 struct l2cap_ctrl *control,
4882 struct sk_buff *skb, u8 event)
4883{
4884 int err = 0;
4885 u16 txseq = control->txseq;
4886 bool skb_in_use = 0;
4887
4888 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
4889 event);
4890
4891 switch (event) {
4892 case L2CAP_EV_RECV_IFRAME:
4893 switch (l2cap_classify_txseq(chan, txseq)) {
4894 case L2CAP_TXSEQ_EXPECTED:
4895 /* Keep frame for reassembly later */
4896 l2cap_pass_to_tx(chan, control);
4897 skb_queue_tail(&chan->srej_q, skb);
4898 skb_in_use = 1;
4899 BT_DBG("Queued %p (queue len %d)", skb,
4900 skb_queue_len(&chan->srej_q));
4901
4902 chan->expected_tx_seq = __next_seq(chan, txseq);
4903 break;
4904 case L2CAP_TXSEQ_EXPECTED_SREJ:
4905 l2cap_seq_list_pop(&chan->srej_list);
4906
4907 l2cap_pass_to_tx(chan, control);
4908 skb_queue_tail(&chan->srej_q, skb);
4909 skb_in_use = 1;
4910 BT_DBG("Queued %p (queue len %d)", skb,
4911 skb_queue_len(&chan->srej_q));
4912
4913 err = l2cap_rx_queued_iframes(chan);
4914 if (err)
4915 break;
4916
4917 break;
4918 case L2CAP_TXSEQ_UNEXPECTED:
4919 /* Got a frame that can't be reassembled yet.
4920 * Save it for later, and send SREJs to cover
4921 * the missing frames.
4922 */
4923 skb_queue_tail(&chan->srej_q, skb);
4924 skb_in_use = 1;
4925 BT_DBG("Queued %p (queue len %d)", skb,
4926 skb_queue_len(&chan->srej_q));
4927
4928 l2cap_pass_to_tx(chan, control);
4929 l2cap_send_srej(chan, control->txseq);
4930 break;
4931 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
4932 /* This frame was requested with an SREJ, but
4933 * some expected retransmitted frames are
4934 * missing. Request retransmission of missing
4935 * SREJ'd frames.
4936 */
4937 skb_queue_tail(&chan->srej_q, skb);
4938 skb_in_use = 1;
4939 BT_DBG("Queued %p (queue len %d)", skb,
4940 skb_queue_len(&chan->srej_q));
4941
4942 l2cap_pass_to_tx(chan, control);
4943 l2cap_send_srej_list(chan, control->txseq);
4944 break;
4945 case L2CAP_TXSEQ_DUPLICATE_SREJ:
4946 /* We've already queued this frame. Drop this copy. */
4947 l2cap_pass_to_tx(chan, control);
4948 break;
4949 case L2CAP_TXSEQ_DUPLICATE:
4950 /* Expecting a later sequence number, so this frame
4951 * was already received. Ignore it completely.
4952 */
4953 break;
4954 case L2CAP_TXSEQ_INVALID_IGNORE:
4955 break;
4956 case L2CAP_TXSEQ_INVALID:
4957 default:
4958 l2cap_send_disconn_req(chan->conn, chan,
4959 ECONNRESET);
4960 break;
4961 }
4962 break;
4963 case L2CAP_EV_RECV_RR:
4964 l2cap_pass_to_tx(chan, control);
4965 if (control->final) {
4966 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4967
4968 if (!test_and_clear_bit(CONN_REJ_ACT,
4969 &chan->conn_state)) {
4970 control->final = 0;
4971 l2cap_retransmit_all(chan, control);
4972 }
4973
4974 l2cap_ertm_send(chan);
4975 } else if (control->poll) {
4976 if (test_and_clear_bit(CONN_REMOTE_BUSY,
4977 &chan->conn_state) &&
4978 chan->unacked_frames) {
4979 __set_retrans_timer(chan);
4980 }
4981
4982 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4983 l2cap_send_srej_tail(chan);
4984 } else {
4985 if (test_and_clear_bit(CONN_REMOTE_BUSY,
4986 &chan->conn_state) &&
4987 chan->unacked_frames)
4988 __set_retrans_timer(chan);
4989
4990 l2cap_send_ack(chan);
4991 }
4992 break;
4993 case L2CAP_EV_RECV_RNR:
4994 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4995 l2cap_pass_to_tx(chan, control);
4996 if (control->poll) {
4997 l2cap_send_srej_tail(chan);
4998 } else {
4999 struct l2cap_ctrl rr_control;
5000 memset(&rr_control, 0, sizeof(rr_control));
5001 rr_control.sframe = 1;
5002 rr_control.super = L2CAP_SUPER_RR;
5003 rr_control.reqseq = chan->buffer_seq;
5004 l2cap_send_sframe(chan, &rr_control);
5005 }
5006
5007 break;
5008 case L2CAP_EV_RECV_REJ:
5009 l2cap_handle_rej(chan, control);
5010 break;
5011 case L2CAP_EV_RECV_SREJ:
5012 l2cap_handle_srej(chan, control);
5013 break;
5014 }
5015
5016 if (skb && !skb_in_use) {
5017 BT_DBG("Freeing %p", skb);
5018 kfree_skb(skb);
5019 }
5020
5021 return err;
5022}
5023
5024static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
5025{
5026 /* Make sure reqseq is for a packet that has been sent but not acked */
5027 u16 unacked;
5028
5029 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
5030 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
5031}
5032
cec8ab6e
MM		 5033static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5034 struct sk_buff *skb, u8 event)
218bb9df 5035{
d2a7ac5d
MM		 5036 int err = 0;
5037
5038 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
5039 control, skb, event, chan->rx_state);
5040
5041 if (__valid_reqseq(chan, control->reqseq)) {
5042 switch (chan->rx_state) {
5043 case L2CAP_RX_STATE_RECV:
5044 err = l2cap_rx_state_recv(chan, control, skb, event);
5045 break;
5046 case L2CAP_RX_STATE_SREJ_SENT:
5047 err = l2cap_rx_state_srej_sent(chan, control, skb,
5048 event);
5049 break;
5050 default:
5051 /* shut it down */
5052 break;
5053 }
5054 } else {
5055 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
5056 control->reqseq, chan->next_tx_seq,
5057 chan->expected_ack_seq);
5058 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
5059 }
5060
5061 return err;
cec8ab6e
MM		 5062}
5063
5064static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5065 struct sk_buff *skb)
5066{
4b51dae9
MM		 5067 int err = 0;
5068
5069 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
5070 chan->rx_state);
5071
5072 if (l2cap_classify_txseq(chan, control->txseq) ==
5073 L2CAP_TXSEQ_EXPECTED) {
5074 l2cap_pass_to_tx(chan, control);
5075
5076 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
5077 __next_seq(chan, chan->buffer_seq));
5078
5079 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5080
5081 l2cap_reassemble_sdu(chan, skb, control);
5082 } else {
5083 if (chan->sdu) {
5084 kfree_skb(chan->sdu);
5085 chan->sdu = NULL;
5086 }
5087 chan->sdu_last_frag = NULL;
5088 chan->sdu_len = 0;
5089
5090 if (skb) {
5091 BT_DBG("Freeing %p", skb);
5092 kfree_skb(skb);
5093 }
5094 }
5095
5096 chan->last_acked_seq = control->txseq;
5097 chan->expected_tx_seq = __next_seq(chan, control->txseq);
5098
5099 return err;
cec8ab6e
MM		 5100}
5101
5102static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
5103{
5104 struct l2cap_ctrl *control = &bt_cb(skb)->control;
5105 u16 len;
5106 u8 event;
218bb9df 5107
b76bbd66
MM		 5108 __unpack_control(chan, skb);
5109
218bb9df
GP		 5110 len = skb->len;
5111
5112 /*
5113 * We can just drop the corrupted I-frame here.
5114 * Receiver will miss it and start proper recovery
cec8ab6e 5115 * procedures and ask for retransmission.
218bb9df 5116 */
47d1ec61 5117 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 5118 goto drop;
5119
cec8ab6e 5120 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 5121 len -= L2CAP_SDULEN_SIZE;
218bb9df 5122
47d1ec61 5123 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 5124 len -= L2CAP_FCS_SIZE;
218bb9df 5125
47d1ec61 5126 if (len > chan->mps) {
8c1d787b 5127 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5128 goto drop;
5129 }
5130
cec8ab6e
MM		 5131 if (!control->sframe) {
5132 int err;
218bb9df 5133
cec8ab6e
MM		 5134 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
5135 control->sar, control->reqseq, control->final,
5136 control->txseq);
218bb9df 5137
cec8ab6e
MM		 5138 /* Validate F-bit - F=0 always valid, F=1 only
5139 * valid in TX WAIT_F
5140 */
5141 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 5142 goto drop;
cec8ab6e
MM		 5143
5144 if (chan->mode != L2CAP_MODE_STREAMING) {
5145 event = L2CAP_EV_RECV_IFRAME;
5146 err = l2cap_rx(chan, control, skb, event);
5147 } else {
5148 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 5149 }
5150
cec8ab6e
MM		 5151 if (err)
5152 l2cap_send_disconn_req(chan->conn, chan,
5153 ECONNRESET);
218bb9df 5154 } else {
cec8ab6e
MM		 5155 const u8 rx_func_to_event[4] = {
5156 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
5157 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
5158 };
5159
5160 /* Only I-frames are expected in streaming mode */
5161 if (chan->mode == L2CAP_MODE_STREAMING)
5162 goto drop;
5163
5164 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
5165 control->reqseq, control->final, control->poll,
5166 control->super);
5167
218bb9df
GP		 5168 if (len != 0) {
5169 BT_ERR("%d", len);
8c1d787b 5170 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5171 goto drop;
5172 }
5173
cec8ab6e
MM		 5174 /* Validate F and P bits */
5175 if (control->final && (control->poll ||
5176 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
5177 goto drop;
5178
5179 event = rx_func_to_event[control->super];
5180 if (l2cap_rx(chan, control, skb, event))
5181 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5182 }
5183
5184 return 0;
5185
5186drop:
5187 kfree_skb(skb);
5188 return 0;
5189}
5190
13ca56e0
AE		 5191static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
5192 struct sk_buff *skb)
1da177e4 5193{
48454079 5194 struct l2cap_chan *chan;
1da177e4 5195
baa7e1fa 5196 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 5197 if (!chan) {
97e8e89d
AE		 5198 if (cid == L2CAP_CID_A2MP) {
5199 chan = a2mp_channel_create(conn, skb);
5200 if (!chan) {
5201 kfree_skb(skb);
13ca56e0 5202 return;
97e8e89d
AE		 5203 }
5204
5205 l2cap_chan_lock(chan);
5206 } else {
5207 BT_DBG("unknown cid 0x%4.4x", cid);
5208 /* Drop packet and return */
5209 kfree_skb(skb);
13ca56e0 5210 return;
97e8e89d 5211 }
1da177e4
LT		 5212 }
5213
49208c9c 5214 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 5215
89bc500e 5216 if (chan->state != BT_CONNECTED)
1da177e4
LT		 5217 goto drop;
5218
0c1bc5c6 5219 switch (chan->mode) {
1c2acffb
GP		 5220 case L2CAP_MODE_BASIC:
5221 /* If socket recv buffers overflows we drop data here
5222 * which is *bad* because L2CAP has to be reliable.
5223 * But we don't have any other choice. L2CAP doesn't
5224 * provide flow control mechanism. */
1da177e4 5225
0c1bc5c6 5226 if (chan->imtu < skb->len)
1c2acffb 5227 goto drop;
1da177e4 5228
80b98027 5229 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 5230 goto done;
5231 break;
5232
5233 case L2CAP_MODE_ERTM:
6840ed07 5234 case L2CAP_MODE_STREAMING:
cec8ab6e 5235 l2cap_data_rcv(chan, skb);
6840ed07
GP		 5236 goto done;
5237
1c2acffb 5238 default:
0c1bc5c6 5239 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 5240 break;
5241 }
1da177e4
LT		 5242
5243drop:
5244 kfree_skb(skb);
5245
5246done:
6be36555 5247 l2cap_chan_unlock(chan);
1da177e4
LT		 5248}
5249
84104b24
AE		 5250static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
5251 struct sk_buff *skb)
1da177e4 5252{
23691d75 5253 struct l2cap_chan *chan;
1da177e4 5254
c2287681 5255 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 5256 if (!chan)
1da177e4
LT		 5257 goto drop;
5258
5b4cedaa 5259 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 5260
89bc500e 5261 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 5262 goto drop;
5263
e13e21dc 5264 if (chan->imtu < skb->len)
1da177e4
LT		 5265 goto drop;
5266
80b98027 5267 if (!chan->ops->recv(chan, skb))
84104b24 5268 return;
1da177e4
LT		 5269
5270drop:
5271 kfree_skb(skb);
1da177e4
LT		 5272}
5273
6810fca7
AE		 5274static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid,
5275 struct sk_buff *skb)
9f69bda6 5276{
23691d75 5277 struct l2cap_chan *chan;
9f69bda6 5278
c2287681 5279 chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst);
23691d75 5280 if (!chan)
9f69bda6
GP		 5281 goto drop;
5282
5b4cedaa 5283 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 5284
89bc500e 5285 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 5286 goto drop;
5287
e13e21dc 5288 if (chan->imtu < skb->len)
9f69bda6
GP		 5289 goto drop;
5290
80b98027 5291 if (!chan->ops->recv(chan, skb))
6810fca7 5292 return;
9f69bda6
GP		 5293
5294drop:
5295 kfree_skb(skb);
9f69bda6
GP		 5296}
5297
1da177e4
LT		 5298static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
5299{
5300 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 5301 u16 cid, len;
5302 __le16 psm;
1da177e4
LT		 5303
5304 skb_pull(skb, L2CAP_HDR_SIZE);
5305 cid = __le16_to_cpu(lh->cid);
5306 len = __le16_to_cpu(lh->len);
5307
1c2acffb
GP		 5308 if (len != skb->len) {
5309 kfree_skb(skb);
5310 return;
5311 }
5312
1da177e4
LT		 5313 BT_DBG("len %d, cid 0x%4.4x", len, cid);
5314
5315 switch (cid) {
3300d9a9 5316 case L2CAP_CID_LE_SIGNALING:
8db4dc46 5317 case L2CAP_CID_SIGNALING:
1da177e4
LT		 5318 l2cap_sig_channel(conn, skb);
5319 break;
5320
8db4dc46 5321 case L2CAP_CID_CONN_LESS:
097db76c 5322 psm = get_unaligned((__le16 *) skb->data);
0181a70f 5323 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 5324 l2cap_conless_channel(conn, psm, skb);
5325 break;
5326
9f69bda6
GP		 5327 case L2CAP_CID_LE_DATA:
5328 l2cap_att_channel(conn, cid, skb);
5329 break;
5330
b501d6a1
AB		 5331 case L2CAP_CID_SMP:
5332 if (smp_sig_channel(conn, skb))
5333 l2cap_conn_del(conn->hcon, EACCES);
5334 break;
5335
1da177e4
LT		 5336 default:
5337 l2cap_data_channel(conn, cid, skb);
5338 break;
5339 }
5340}
5341
5342/* ---- L2CAP interface with lower layer (HCI) ---- */
5343
686ebf28 5344int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 5345{
5346 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 5347 struct l2cap_chan *c;
1da177e4 5348
1da177e4
LT		 5349 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
5350
5351 /* Find listening sockets and check their link_mode */
23691d75
GP		 5352 read_lock(&chan_list_lock);
5353 list_for_each_entry(c, &chan_list, global_l) {
5354 struct sock *sk = c->sk;
4343478f 5355
89bc500e 5356 if (c->state != BT_LISTEN)
1da177e4
LT		 5357 continue;
5358
5359 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 5360 lm1 |= HCI_LM_ACCEPT;
43bd0f32 5361 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 5362 lm1 |= HCI_LM_MASTER;
1da177e4 5363 exact++;
2af6b9d5
MH		 5364 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
5365 lm2 |= HCI_LM_ACCEPT;
43bd0f32 5366 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 5367 lm2 |= HCI_LM_MASTER;
5368 }
1da177e4 5369 }
23691d75 5370 read_unlock(&chan_list_lock);
1da177e4
LT		 5371
5372 return exact ? lm1 : lm2;
5373}
5374
9e664631 5375void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 5376{
0139418c
MH		 5377 struct l2cap_conn *conn;
5378
1da177e4
LT		 5379 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
5380
1da177e4 5381 if (!status) {
1da177e4
LT		 5382 conn = l2cap_conn_add(hcon, status);
5383 if (conn)
5384 l2cap_conn_ready(conn);
0139418c 5385 } else
e175072f 5386 l2cap_conn_del(hcon, bt_to_errno(status));
1da177e4 5387
1da177e4
LT		 5388}
5389
686ebf28 5390int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 5391{
5392 struct l2cap_conn *conn = hcon->l2cap_data;
5393
5394 BT_DBG("hcon %p", hcon);
5395
686ebf28 5396 if (!conn)
9f5a0d7b 5397 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 5398 return conn->disc_reason;
5399}
5400
9e664631 5401void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 5402{
5403 BT_DBG("hcon %p reason %d", hcon, reason);
5404
e175072f 5405 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 5406}
5407
4343478f 5408static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 5409{
715ec005 5410 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 5411 return;
5412
f62e4323 5413 if (encrypt == 0x00) {
4343478f 5414 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 5415 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 5416 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 5417 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 5418 } else {
4343478f 5419 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 5420 __clear_chan_timer(chan);
f62e4323
MH		 5421 }
5422}
5423
686ebf28 5424int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 5425{
0139418c 5426 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 5427 struct l2cap_chan *chan;
1da177e4 5428
0139418c 5429 if (!conn)
1da177e4 5430 return 0;
0139418c 5431
89d8b407 5432 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 5433
160dc6ac 5434 if (hcon->type == LE_LINK) {
35d4adcc
HG		 5435 if (!status && encrypt)
5436 smp_distribute_keys(conn, 0);
17cd3f37 5437 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 5438 }
5439
3df91ea2 5440 mutex_lock(&conn->chan_lock);
1da177e4 5441
3df91ea2 5442 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 5443 l2cap_chan_lock(chan);
1da177e4 5444
89d8b407
AE		 5445 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
5446 state_to_string(chan->state));
f1cb9af5 5447
78eb2f98
AE		 5448 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
5449 l2cap_chan_unlock(chan);
5450 continue;
5451 }
5452
f1cb9af5
VCG		 5453 if (chan->scid == L2CAP_CID_LE_DATA) {
5454 if (!status && encrypt) {
5455 chan->sec_level = hcon->sec_level;
cf4cd009 5456 l2cap_chan_ready(chan);
f1cb9af5
VCG		 5457 }
5458
6be36555 5459 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 5460 continue;
5461 }
5462
c1360a1c 5463 if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
6be36555 5464 l2cap_chan_unlock(chan);
6a8d3010
MH		 5465 continue;
5466 }
5467
89bc500e
GP		 5468 if (!status && (chan->state == BT_CONNECTED ||
5469 chan->state == BT_CONFIG)) {
a7d7723a
GP		 5470 struct sock *sk = chan->sk;
5471
c5daa683 5472 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
a7d7723a
GP		 5473 sk->sk_state_change(sk);
5474
4343478f 5475 l2cap_check_encryption(chan, encrypt);
6be36555 5476 l2cap_chan_unlock(chan);
9719f8af
MH		 5477 continue;
5478 }
5479
89bc500e 5480 if (chan->state == BT_CONNECT) {
b1235d79 5481 if (!status) {
93c3e8f5 5482 l2cap_start_connection(chan);
b1235d79 5483 } else {
ba13ccd9 5484 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 5485 }
89bc500e 5486 } else if (chan->state == BT_CONNECT2) {
6be36555 5487 struct sock *sk = chan->sk;
b1235d79 5488 struct l2cap_conn_rsp rsp;
df3c3931 5489 __u16 res, stat;
1da177e4 5490
6be36555
AE		 5491 lock_sock(sk);
5492
b1235d79 5493 if (!status) {
c5daa683
GP		 5494 if (test_bit(BT_SK_DEFER_SETUP,
5495 &bt_sk(sk)->flags)) {
df3c3931
JH		 5496 struct sock *parent = bt_sk(sk)->parent;
5497 res = L2CAP_CR_PEND;
5498 stat = L2CAP_CS_AUTHOR_PEND;
05e9a2f6
IK		 5499 if (parent)
5500 parent->sk_data_ready(parent, 0);
df3c3931 5501 } else {
0e587be7 5502 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 5503 res = L2CAP_CR_SUCCESS;
5504 stat = L2CAP_CS_NO_INFO;
5505 }
b1235d79 5506 } else {
0e587be7 5507 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 5508 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 5509 res = L2CAP_CR_SEC_BLOCK;
5510 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 5511 }
5512
6be36555
AE		 5513 release_sock(sk);
5514
fe4128e0
GP		 5515 rsp.scid = cpu_to_le16(chan->dcid);
5516 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 5517 rsp.result = cpu_to_le16(res);
5518 rsp.status = cpu_to_le16(stat);
fc7f8a7e
GP		 5519 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
5520 sizeof(rsp), &rsp);
2d369359
MM		 5521
5522 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
5523 res == L2CAP_CR_SUCCESS) {
5524 char buf[128];
5525 set_bit(CONF_REQ_SENT, &chan->conf_state);
5526 l2cap_send_cmd(conn, l2cap_get_ident(conn),
5527 L2CAP_CONF_REQ,
5528 l2cap_build_conf_req(chan, buf),
5529 buf);
5530 chan->num_conf_req++;
5531 }
b1235d79 5532 }
1da177e4 5533
6be36555 5534 l2cap_chan_unlock(chan);
1da177e4
LT		 5535 }
5536
3df91ea2 5537 mutex_unlock(&conn->chan_lock);
b1235d79 5538
1da177e4
LT		 5539 return 0;
5540}
5541
686ebf28 5542int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 5543{
5544 struct l2cap_conn *conn = hcon->l2cap_data;
5545
5a08ecce
AE		 5546 if (!conn)
5547 conn = l2cap_conn_add(hcon, 0);
5548
5549 if (!conn)
1da177e4
LT		 5550 goto drop;
5551
5552 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
5553
e702112f 5554 if (!(flags & ACL_CONT)) {
1da177e4
LT		 5555 struct l2cap_hdr *hdr;
5556 int len;
5557
5558 if (conn->rx_len) {
5559 BT_ERR("Unexpected start frame (len %d)", skb->len);
5560 kfree_skb(conn->rx_skb);
5561 conn->rx_skb = NULL;
5562 conn->rx_len = 0;
5563 l2cap_conn_unreliable(conn, ECOMM);
5564 }
5565
aae7fe22
AE		 5566 /* Start fragment always begin with Basic L2CAP header */
5567 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 5568 BT_ERR("Frame is too short (len %d)", skb->len);
5569 l2cap_conn_unreliable(conn, ECOMM);
5570 goto drop;
5571 }
5572
5573 hdr = (struct l2cap_hdr *) skb->data;
5574 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
5575
5576 if (len == skb->len) {
5577 /* Complete frame received */
5578 l2cap_recv_frame(conn, skb);
5579 return 0;
5580 }
5581
5582 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
5583
5584 if (skb->len > len) {
5585 BT_ERR("Frame is too long (len %d, expected len %d)",
5586 skb->len, len);
5587 l2cap_conn_unreliable(conn, ECOMM);
5588 goto drop;
5589 }
5590
5591 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 5592 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
5593 if (!conn->rx_skb)
1da177e4
LT		 5594 goto drop;
5595
d626f62b 5596 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 5597 skb->len);
1da177e4
LT		 5598 conn->rx_len = len - skb->len;
5599 } else {
5600 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
5601
5602 if (!conn->rx_len) {
5603 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
5604 l2cap_conn_unreliable(conn, ECOMM);
5605 goto drop;
5606 }
5607
5608 if (skb->len > conn->rx_len) {
5609 BT_ERR("Fragment is too long (len %d, expected %d)",
5610 skb->len, conn->rx_len);
5611 kfree_skb(conn->rx_skb);
5612 conn->rx_skb = NULL;
5613 conn->rx_len = 0;
5614 l2cap_conn_unreliable(conn, ECOMM);
5615 goto drop;
5616 }
5617
d626f62b 5618 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 5619 skb->len);
1da177e4
LT		 5620 conn->rx_len -= skb->len;
5621
5622 if (!conn->rx_len) {
5623 /* Complete frame received */
5624 l2cap_recv_frame(conn, conn->rx_skb);
5625 conn->rx_skb = NULL;
5626 }
5627 }
5628
5629drop:
5630 kfree_skb(skb);
5631 return 0;
5632}
5633
aef7d97c 5634static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 5635{
23691d75 5636 struct l2cap_chan *c;
1da177e4 5637
333055f2 5638 read_lock(&chan_list_lock);
1da177e4 5639
23691d75
GP		 5640 list_for_each_entry(c, &chan_list, global_l) {
5641 struct sock *sk = c->sk;
101545f6 5642
903d343e 5643 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
aef7d97c
MH		 5644 batostr(&bt_sk(sk)->src),
5645 batostr(&bt_sk(sk)->dst),
89bc500e 5646 c->state, __le16_to_cpu(c->psm),
23691d75
GP		 5647 c->scid, c->dcid, c->imtu, c->omtu,
5648 c->sec_level, c->mode);
61e1b4b7 5649 }
1da177e4 5650
333055f2 5651 read_unlock(&chan_list_lock);
1da177e4 5652
aef7d97c 5653 return 0;
1da177e4
LT		 5654}
5655
aef7d97c
MH		 5656static int l2cap_debugfs_open(struct inode *inode, struct file *file)
5657{
5658 return single_open(file, l2cap_debugfs_show, inode->i_private);
5659}
5660
5661static const struct file_operations l2cap_debugfs_fops = {
5662 .open = l2cap_debugfs_open,
5663 .read = seq_read,
5664 .llseek = seq_lseek,
5665 .release = single_release,
5666};
5667
5668static struct dentry *l2cap_debugfs;
1da177e4 5669
64274518 5670int __init l2cap_init(void)
1da177e4
LT		 5671{
5672 int err;
be9d1227 5673
bb58f747 5674 err = l2cap_init_sockets();
1da177e4
LT		 5675 if (err < 0)
5676 return err;
5677
aef7d97c
MH		 5678 if (bt_debugfs) {
5679 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
5680 bt_debugfs, NULL, &l2cap_debugfs_fops);
5681 if (!l2cap_debugfs)
5682 BT_ERR("Failed to create L2CAP debug file");
5683 }
1da177e4 5684
1da177e4 5685 return 0;
1da177e4
LT		 5686}
5687
64274518 5688void l2cap_exit(void)
1da177e4 5689{
aef7d97c 5690 debugfs_remove(l2cap_debugfs);
bb58f747 5691 l2cap_cleanup_sockets();
1da177e4
LT		 5692}
5693
d1c4a17d
GP		 5694module_param(disable_ertm, bool, 0644);
5695MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)