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Bluetooth: Use the ERTM transmit state machine from timeout handlers
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
422e925b 7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
1da177e4
LT		 8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
8e87d142
YH		 24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 26 SOFTWARE IS DISCLAIMED.
27*/
28
bb58f747 29/* Bluetooth L2CAP core. */
1da177e4 30
1da177e4
LT		 31#include <linux/module.h>
32
33#include <linux/types.h>
4fc268d2 34#include <linux/capability.h>
1da177e4
LT		 35#include <linux/errno.h>
36#include <linux/kernel.h>
1da177e4
LT		 37#include <linux/sched.h>
38#include <linux/slab.h>
39#include <linux/poll.h>
40#include <linux/fcntl.h>
41#include <linux/init.h>
42#include <linux/interrupt.h>
43#include <linux/socket.h>
44#include <linux/skbuff.h>
1da177e4 45#include <linux/list.h>
be9d1227 46#include <linux/device.h>
aef7d97c
MH		 47#include <linux/debugfs.h>
48#include <linux/seq_file.h>
af05b30b 49#include <linux/uaccess.h>
fcc203c3 50#include <linux/crc16.h>
1da177e4
LT		 51#include <net/sock.h>
52
1da177e4
LT		 53#include <asm/unaligned.h>
54
55#include <net/bluetooth/bluetooth.h>
56#include <net/bluetooth/hci_core.h>
57#include <net/bluetooth/l2cap.h>
b501d6a1 58#include <net/bluetooth/smp.h>
1da177e4 59
b191e031 60bool disable_ertm = 1;
f0709e03 61
47ec1dcd 62static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
50a147cd 63static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
1da177e4 64
b5ad8b7f
JB		 65static LIST_HEAD(chan_list);
66static DEFINE_RWLOCK(chan_list_lock);
1da177e4 67
1da177e4
LT		 68static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
69 u8 code, u8 ident, u16 dlen, void *data);
4519de9a
GP		 70static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
71 void *data);
710f9b0a 72static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
4519de9a 73static void l2cap_send_disconn_req(struct l2cap_conn *conn,
c5daa683 74 struct l2cap_chan *chan, int err);
1da177e4 75
608bcc6d
MM		 76static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
77 struct sk_buff_head *skbs, u8 event);
78
0139418c 79/* ---- L2CAP channels ---- */
71ba0e56 80
baa7e1fa 81static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
0139418c 82{
3df91ea2 83 struct l2cap_chan *c;
3d57dc68 84
3df91ea2
AE		 85 list_for_each_entry(c, &conn->chan_l, list) {
86 if (c->dcid == cid)
87 return c;
0139418c 88 }
3df91ea2 89 return NULL;
0139418c
MH		 90}
91
baa7e1fa 92static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 93{
3df91ea2 94 struct l2cap_chan *c;
3d57dc68 95
3df91ea2
AE		 96 list_for_each_entry(c, &conn->chan_l, list) {
97 if (c->scid == cid)
98 return c;
0139418c 99 }
3df91ea2 100 return NULL;
0139418c
MH		 101}
102
103/* Find channel with given SCID.
ef191ade 104 * Returns locked channel. */
baa7e1fa 105static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 106{
48454079 107 struct l2cap_chan *c;
baa7e1fa 108
3df91ea2 109 mutex_lock(&conn->chan_lock);
baa7e1fa 110 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 111 if (c)
112 l2cap_chan_lock(c);
3df91ea2
AE		 113 mutex_unlock(&conn->chan_lock);
114
48454079 115 return c;
0139418c
MH		 116}
117
baa7e1fa 118static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 119{
3df91ea2 120 struct l2cap_chan *c;
3d57dc68 121
3df91ea2
AE		 122 list_for_each_entry(c, &conn->chan_l, list) {
123 if (c->ident == ident)
124 return c;
0139418c 125 }
3df91ea2 126 return NULL;
0139418c
MH		 127}
128
23691d75 129static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 130{
23691d75 131 struct l2cap_chan *c;
9e4425ff 132
23691d75
GP		 133 list_for_each_entry(c, &chan_list, global_l) {
134 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
250938cb 135 return c;
9e4425ff 136 }
250938cb 137 return NULL;
9e4425ff
GP		 138}
139
140int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
141{
73b2ec18
GP		 142 int err;
143
333055f2 144 write_lock(&chan_list_lock);
9e4425ff 145
23691d75 146 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 147 err = -EADDRINUSE;
148 goto done;
9e4425ff
GP		 149 }
150
73b2ec18
GP		 151 if (psm) {
152 chan->psm = psm;
153 chan->sport = psm;
154 err = 0;
155 } else {
156 u16 p;
157
158 err = -EINVAL;
159 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 160 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 161 chan->psm = cpu_to_le16(p);
162 chan->sport = cpu_to_le16(p);
163 err = 0;
164 break;
165 }
166 }
9e4425ff 167
73b2ec18 168done:
333055f2 169 write_unlock(&chan_list_lock);
73b2ec18 170 return err;
9e4425ff
GP		 171}
172
173int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
174{
333055f2 175 write_lock(&chan_list_lock);
9e4425ff
GP		 176
177 chan->scid = scid;
178
333055f2 179 write_unlock(&chan_list_lock);
9e4425ff
GP		 180
181 return 0;
182}
183
baa7e1fa 184static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 185{
8db4dc46 186 u16 cid = L2CAP_CID_DYN_START;
0139418c 187
8db4dc46 188 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 189 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 190 return cid;
191 }
192
193 return 0;
194}
195
0e587be7 196static void __l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 197{
42d2d87c 198 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
badaaa00
GP		 199 state_to_string(state));
200
89bc500e
GP		 201 chan->state = state;
202 chan->ops->state_change(chan->data, state);
203}
204
0e587be7
AE		 205static void l2cap_state_change(struct l2cap_chan *chan, int state)
206{
207 struct sock *sk = chan->sk;
208
209 lock_sock(sk);
210 __l2cap_state_change(chan, state);
211 release_sock(sk);
212}
213
2e0052e4
AE		 214static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err)
215{
216 struct sock *sk = chan->sk;
217
218 sk->sk_err = err;
219}
220
221static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
222{
223 struct sock *sk = chan->sk;
224
225 lock_sock(sk);
226 __l2cap_chan_set_err(chan, err);
227 release_sock(sk);
228}
229
4239d16f
MM		 230static void __set_retrans_timer(struct l2cap_chan *chan)
231{
232 if (!delayed_work_pending(&chan->monitor_timer) &&
233 chan->retrans_timeout) {
234 l2cap_set_timer(chan, &chan->retrans_timer,
235 msecs_to_jiffies(chan->retrans_timeout));
236 }
237}
238
239static void __set_monitor_timer(struct l2cap_chan *chan)
240{
241 __clear_retrans_timer(chan);
242 if (chan->monitor_timeout) {
243 l2cap_set_timer(chan, &chan->monitor_timer,
244 msecs_to_jiffies(chan->monitor_timeout));
245 }
246}
247
608bcc6d
MM		 248static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
249 u16 seq)
250{
251 struct sk_buff *skb;
252
253 skb_queue_walk(head, skb) {
254 if (bt_cb(skb)->control.txseq == seq)
255 return skb;
256 }
257
258 return NULL;
259}
260
3c588192
MM		 261/* ---- L2CAP sequence number lists ---- */
262
263/* For ERTM, ordered lists of sequence numbers must be tracked for
264 * SREJ requests that are received and for frames that are to be
265 * retransmitted. These seq_list functions implement a singly-linked
266 * list in an array, where membership in the list can also be checked
267 * in constant time. Items can also be added to the tail of the list
268 * and removed from the head in constant time, without further memory
269 * allocs or frees.
270 */
271
272static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
273{
274 size_t alloc_size, i;
275
276 /* Allocated size is a power of 2 to map sequence numbers
277 * (which may be up to 14 bits) in to a smaller array that is
278 * sized for the negotiated ERTM transmit windows.
279 */
280 alloc_size = roundup_pow_of_two(size);
281
282 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
283 if (!seq_list->list)
284 return -ENOMEM;
285
286 seq_list->mask = alloc_size - 1;
287 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
288 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
289 for (i = 0; i < alloc_size; i++)
290 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
291
292 return 0;
293}
294
295static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
296{
297 kfree(seq_list->list);
298}
299
300static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
301 u16 seq)
302{
303 /* Constant-time check for list membership */
304 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
305}
306
307static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
308{
309 u16 mask = seq_list->mask;
310
311 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
312 /* In case someone tries to pop the head of an empty list */
313 return L2CAP_SEQ_LIST_CLEAR;
314 } else if (seq_list->head == seq) {
315 /* Head can be removed in constant time */
316 seq_list->head = seq_list->list[seq & mask];
317 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
318
319 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
320 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
321 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
322 }
323 } else {
324 /* Walk the list to find the sequence number */
325 u16 prev = seq_list->head;
326 while (seq_list->list[prev & mask] != seq) {
327 prev = seq_list->list[prev & mask];
328 if (prev == L2CAP_SEQ_LIST_TAIL)
329 return L2CAP_SEQ_LIST_CLEAR;
330 }
331
332 /* Unlink the number from the list and clear it */
333 seq_list->list[prev & mask] = seq_list->list[seq & mask];
334 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
335 if (seq_list->tail == seq)
336 seq_list->tail = prev;
337 }
338 return seq;
339}
340
341static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
342{
343 /* Remove the head in constant time */
344 return l2cap_seq_list_remove(seq_list, seq_list->head);
345}
346
347static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
348{
f522ae36 349 u16 i;
3c588192 350
f522ae36
GP		 351 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
352 return;
353
354 for (i = 0; i <= seq_list->mask; i++)
355 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
356
357 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
358 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 359}
360
361static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
362{
363 u16 mask = seq_list->mask;
364
365 /* All appends happen in constant time */
366
f522ae36
GP		 367 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
368 return;
3c588192 369
f522ae36
GP		 370 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
371 seq_list->head = seq;
372 else
373 seq_list->list[seq_list->tail & mask] = seq;
374
375 seq_list->tail = seq;
376 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 377}
378
721c4181 379static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 380{
721c4181
GP		 381 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
382 chan_timer.work);
3df91ea2 383 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 384 int reason;
385
e05dcc32 386 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 387
3df91ea2 388 mutex_lock(&conn->chan_lock);
6be36555 389 l2cap_chan_lock(chan);
ab07801d 390
89bc500e 391 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 392 reason = ECONNREFUSED;
89bc500e 393 else if (chan->state == BT_CONNECT &&
ab07801d
GP		 394 chan->sec_level != BT_SECURITY_SDP)
395 reason = ECONNREFUSED;
396 else
397 reason = ETIMEDOUT;
398
0f852724 399 l2cap_chan_close(chan, reason);
ab07801d 400
6be36555 401 l2cap_chan_unlock(chan);
ab07801d 402
ba3bd0ee 403 chan->ops->close(chan->data);
3df91ea2
AE		 404 mutex_unlock(&conn->chan_lock);
405
371fd835 406 l2cap_chan_put(chan);
ab07801d
GP		 407}
408
eef1d9b6 409struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 410{
411 struct l2cap_chan *chan;
412
413 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
414 if (!chan)
415 return NULL;
416
c03b355e
AE		 417 mutex_init(&chan->lock);
418
333055f2 419 write_lock(&chan_list_lock);
23691d75 420 list_add(&chan->global_l, &chan_list);
333055f2 421 write_unlock(&chan_list_lock);
23691d75 422
721c4181 423 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 424
89bc500e
GP		 425 chan->state = BT_OPEN;
426
71ba0e56
GP		 427 atomic_set(&chan->refcnt, 1);
428
2827011f
MM		 429 /* This flag is cleared in l2cap_chan_ready() */
430 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
431
eef1d9b6 432 BT_DBG("chan %p", chan);
abc545b8 433
48454079
GP		 434 return chan;
435}
436
23691d75 437void l2cap_chan_destroy(struct l2cap_chan *chan)
6ff5abbf 438{
333055f2 439 write_lock(&chan_list_lock);
23691d75 440 list_del(&chan->global_l);
333055f2 441 write_unlock(&chan_list_lock);
23691d75 442
371fd835 443 l2cap_chan_put(chan);
6ff5abbf
GP		 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;
452 chan->sec_level = BT_SECURITY_LOW;
453
454 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
455}
456
14a28491 457static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 458{
af05b30b 459 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 460 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 461
9f5a0d7b 462 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 463
8c1d787b 464 chan->conn = conn;
0139418c 465
5491120e
AE		 466 switch (chan->chan_type) {
467 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b
VT		 468 if (conn->hcon->type == LE_LINK) {
469 /* LE connection */
0c1bc5c6 470 chan->omtu = L2CAP_LE_DEFAULT_MTU;
fe4128e0
GP		 471 chan->scid = L2CAP_CID_LE_DATA;
472 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 473 } else {
474 /* Alloc CID for connection-oriented socket */
fe4128e0 475 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 476 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 477 }
5491120e
AE		 478 break;
479
480 case L2CAP_CHAN_CONN_LESS:
0139418c 481 /* Connectionless socket */
fe4128e0
GP		 482 chan->scid = L2CAP_CID_CONN_LESS;
483 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 484 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 485 break;
486
487 default:
0139418c 488 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 489 chan->scid = L2CAP_CID_SIGNALING;
490 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 491 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 492 }
493
8f7975b1
AE		 494 chan->local_id = L2CAP_BESTEFFORT_ID;
495 chan->local_stype = L2CAP_SERV_BESTEFFORT;
496 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
497 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
498 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
499 chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO;
500
371fd835 501 l2cap_chan_hold(chan);
baa7e1fa 502
3df91ea2 503 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 504}
505
14a28491 506static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 507{
508 mutex_lock(&conn->chan_lock);
509 __l2cap_chan_add(conn, chan);
3df91ea2 510 mutex_unlock(&conn->chan_lock);
0139418c
MH		 511}
512
4519de9a 513static void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 514{
48454079 515 struct sock *sk = chan->sk;
8c1d787b 516 struct l2cap_conn *conn = chan->conn;
0139418c
MH		 517 struct sock *parent = bt_sk(sk)->parent;
518
c9b66675 519 __clear_chan_timer(chan);
0139418c 520
49208c9c 521 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 522
8e87d142 523 if (conn) {
baa7e1fa 524 /* Delete from channel list */
3df91ea2 525 list_del(&chan->list);
3d57dc68 526
371fd835 527 l2cap_chan_put(chan);
baa7e1fa 528
8c1d787b 529 chan->conn = NULL;
0139418c
MH		 530 hci_conn_put(conn->hcon);
531 }
532
6be36555
AE		 533 lock_sock(sk);
534
0e587be7 535 __l2cap_state_change(chan, BT_CLOSED);
0139418c
MH		 536 sock_set_flag(sk, SOCK_ZAPPED);
537
538 if (err)
2e0052e4 539 __l2cap_chan_set_err(chan, err);
0139418c
MH		 540
541 if (parent) {
542 bt_accept_unlink(sk);
543 parent->sk_data_ready(parent, 0);
544 } else
545 sk->sk_state_change(sk);
c13ffa62 546
6be36555
AE		 547 release_sock(sk);
548
2827011f 549 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 550 return;
2ead70b8 551
58d35f87 552 skb_queue_purge(&chan->tx_q);
c13ffa62 553
0c1bc5c6 554 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 555 __clear_retrans_timer(chan);
556 __clear_monitor_timer(chan);
557 __clear_ack_timer(chan);
c13ffa62 558
f1c6775b 559 skb_queue_purge(&chan->srej_q);
c13ffa62 560
3c588192
MM		 561 l2cap_seq_list_free(&chan->srej_list);
562 l2cap_seq_list_free(&chan->retrans_list);
c13ffa62 563 }
0139418c
MH		 564}
565
4519de9a
GP		 566static void l2cap_chan_cleanup_listen(struct sock *parent)
567{
568 struct sock *sk;
569
570 BT_DBG("parent %p", parent);
571
572 /* Close not yet accepted channels */
0f852724 573 while ((sk = bt_accept_dequeue(parent, NULL))) {
ba3bd0ee 574 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
3df91ea2 575
6be36555 576 l2cap_chan_lock(chan);
c9b66675 577 __clear_chan_timer(chan);
ba3bd0ee 578 l2cap_chan_close(chan, ECONNRESET);
6be36555 579 l2cap_chan_unlock(chan);
3df91ea2 580
ba3bd0ee 581 chan->ops->close(chan->data);
0f852724 582 }
4519de9a
GP		 583}
584
0f852724 585void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 586{
587 struct l2cap_conn *conn = chan->conn;
588 struct sock *sk = chan->sk;
589
e05dcc32
AE		 590 BT_DBG("chan %p state %s sk %p", chan,
591 state_to_string(chan->state), sk);
4519de9a 592
89bc500e 593 switch (chan->state) {
4519de9a 594 case BT_LISTEN:
6be36555 595 lock_sock(sk);
4519de9a 596 l2cap_chan_cleanup_listen(sk);
89bc500e 597
0e587be7 598 __l2cap_state_change(chan, BT_CLOSED);
89bc500e 599 sock_set_flag(sk, SOCK_ZAPPED);
6be36555 600 release_sock(sk);
4519de9a
GP		 601 break;
602
603 case BT_CONNECTED:
604 case BT_CONFIG:
715ec005 605 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a 606 conn->hcon->type == ACL_LINK) {
c9b66675 607 __set_chan_timer(chan, sk->sk_sndtimeo);
4519de9a
GP		 608 l2cap_send_disconn_req(conn, chan, reason);
609 } else
610 l2cap_chan_del(chan, reason);
611 break;
612
613 case BT_CONNECT2:
715ec005 614 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a
GP		 615 conn->hcon->type == ACL_LINK) {
616 struct l2cap_conn_rsp rsp;
617 __u16 result;
618
c5daa683 619 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
4519de9a
GP		 620 result = L2CAP_CR_SEC_BLOCK;
621 else
622 result = L2CAP_CR_BAD_PSM;
89bc500e 623 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 624
625 rsp.scid = cpu_to_le16(chan->dcid);
626 rsp.dcid = cpu_to_le16(chan->scid);
627 rsp.result = cpu_to_le16(result);
628 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
629 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
630 sizeof(rsp), &rsp);
631 }
632
633 l2cap_chan_del(chan, reason);
634 break;
635
636 case BT_CONNECT:
637 case BT_DISCONN:
638 l2cap_chan_del(chan, reason);
639 break;
640
641 default:
6be36555 642 lock_sock(sk);
4519de9a 643 sock_set_flag(sk, SOCK_ZAPPED);
6be36555 644 release_sock(sk);
4519de9a
GP		 645 break;
646 }
647}
648
4343478f 649static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 650{
715ec005 651 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 652 switch (chan->sec_level) {
8556edd3
JH		 653 case BT_SECURITY_HIGH:
654 return HCI_AT_DEDICATED_BONDING_MITM;
655 case BT_SECURITY_MEDIUM:
656 return HCI_AT_DEDICATED_BONDING;
657 default:
658 return HCI_AT_NO_BONDING;
659 }
fe4128e0 660 } else if (chan->psm == cpu_to_le16(0x0001)) {
4343478f
GP		 661 if (chan->sec_level == BT_SECURITY_LOW)
662 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 663
4343478f 664 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 665 return HCI_AT_NO_BONDING_MITM;
00ae4af9 666 else
8556edd3 667 return HCI_AT_NO_BONDING;
00ae4af9 668 } else {
4343478f 669 switch (chan->sec_level) {
00ae4af9 670 case BT_SECURITY_HIGH:
8556edd3 671 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 672 case BT_SECURITY_MEDIUM:
8556edd3 673 return HCI_AT_GENERAL_BONDING;
00ae4af9 674 default:
8556edd3 675 return HCI_AT_NO_BONDING;
00ae4af9 676 }
0684e5f9 677 }
8556edd3
JH		 678}
679
680/* Service level security */
d45fc423 681int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 682{
8c1d787b 683 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 684 __u8 auth_type;
685
4343478f 686 auth_type = l2cap_get_auth_type(chan);
79d554a6 687
4343478f 688 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 689}
690
b5ad8b7f 691static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 692{
693 u8 id;
694
695 /* Get next available identificator.
696 * 1 - 128 are used by kernel.
697 * 129 - 199 are reserved.
698 * 200 - 254 are used by utilities like l2ping, etc.
699 */
700
333055f2 701 spin_lock(&conn->lock);
4e8402a3
MH		 702
703 if (++conn->tx_ident > 128)
704 conn->tx_ident = 1;
705
706 id = conn->tx_ident;
707
333055f2 708 spin_unlock(&conn->lock);
4e8402a3
MH		 709
710 return id;
711}
712
4519de9a 713static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 714{
715 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 716 u8 flags;
4e8402a3
MH		 717
718 BT_DBG("code 0x%2.2x", code);
719
720 if (!skb)
9a9c6a34 721 return;
4e8402a3 722
e702112f
AE		 723 if (lmp_no_flush_capable(conn->hcon->hdev))
724 flags = ACL_START_NO_FLUSH;
725 else
726 flags = ACL_START;
727
14b12d0b 728 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 729 skb->priority = HCI_PRIO_MAX;
14b12d0b 730
73d80deb
LAD		 731 hci_send_acl(conn->hchan, skb, flags);
732}
733
734static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
735{
736 struct hci_conn *hcon = chan->conn->hcon;
737 u16 flags;
738
739 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
740 skb->priority);
741
742 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
743 lmp_no_flush_capable(hcon->hdev))
744 flags = ACL_START_NO_FLUSH;
745 else
746 flags = ACL_START;
14b12d0b 747
73d80deb
LAD		 748 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
749 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 750}
751
b76bbd66
MM		 752static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
753{
754 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
755 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
756
757 if (enh & L2CAP_CTRL_FRAME_TYPE) {
758 /* S-Frame */
759 control->sframe = 1;
760 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
761 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
762
763 control->sar = 0;
764 control->txseq = 0;
765 } else {
766 /* I-Frame */
767 control->sframe = 0;
768 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
769 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
770
771 control->poll = 0;
772 control->super = 0;
773 }
774}
775
b76bbd66
MM		 776static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
777{
778 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
779 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
780
781 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
782 /* S-Frame */
783 control->sframe = 1;
784 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
785 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
786
787 control->sar = 0;
788 control->txseq = 0;
789 } else {
790 /* I-Frame */
791 control->sframe = 0;
792 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
793 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
794
795 control->poll = 0;
796 control->super = 0;
797 }
798}
799
800static inline void __unpack_control(struct l2cap_chan *chan,
801 struct sk_buff *skb)
802{
803 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
804 __unpack_extended_control(get_unaligned_le32(skb->data),
805 &bt_cb(skb)->control);
cec8ab6e 806 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 807 } else {
808 __unpack_enhanced_control(get_unaligned_le16(skb->data),
809 &bt_cb(skb)->control);
cec8ab6e 810 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 811 }
812}
813
b5c6aaed
MM		 814static u32 __pack_extended_control(struct l2cap_ctrl *control)
815{
816 u32 packed;
817
818 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
819 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
820
821 if (control->sframe) {
822 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
823 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
824 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
825 } else {
826 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
827 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
828 }
829
830 return packed;
831}
832
833static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
834{
835 u16 packed;
836
837 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
838 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
839
840 if (control->sframe) {
841 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
842 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
843 packed |= L2CAP_CTRL_FRAME_TYPE;
844 } else {
845 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
846 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
847 }
848
849 return packed;
850}
851
b76bbd66
MM		 852static inline void __pack_control(struct l2cap_chan *chan,
853 struct l2cap_ctrl *control,
854 struct sk_buff *skb)
855{
856 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
857 put_unaligned_le32(__pack_extended_control(control),
858 skb->data + L2CAP_HDR_SIZE);
859 } else {
860 put_unaligned_le16(__pack_enhanced_control(control),
861 skb->data + L2CAP_HDR_SIZE);
862 }
863}
864
a67d7f6f
MM		 865static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
866 u32 control)
b5c6aaed
MM		 867{
868 struct sk_buff *skb;
869 struct l2cap_hdr *lh;
a67d7f6f 870 int hlen;
b5c6aaed
MM		 871
872 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
873 hlen = L2CAP_EXT_HDR_SIZE;
874 else
875 hlen = L2CAP_ENH_HDR_SIZE;
876
877 if (chan->fcs == L2CAP_FCS_CRC16)
878 hlen += L2CAP_FCS_SIZE;
879
a67d7f6f 880 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 881
b5c6aaed 882 if (!skb)
a67d7f6f 883 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 884
885 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
886 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
887 lh->cid = cpu_to_le16(chan->dcid);
888
a67d7f6f
MM		 889 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
890 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
891 else
892 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 893
894 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 895 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 896 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
897 }
898
899 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 900 return skb;
901}
902
903static void l2cap_send_sframe(struct l2cap_chan *chan,
904 struct l2cap_ctrl *control)
905{
906 struct sk_buff *skb;
907 u32 control_field;
908
909 BT_DBG("chan %p, control %p", chan, control);
910
911 if (!control->sframe)
912 return;
913
914 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
915 !control->poll)
916 control->final = 1;
917
918 if (control->super == L2CAP_SUPER_RR)
919 clear_bit(CONN_RNR_SENT, &chan->conn_state);
920 else if (control->super == L2CAP_SUPER_RNR)
921 set_bit(CONN_RNR_SENT, &chan->conn_state);
922
923 if (control->super != L2CAP_SUPER_SREJ) {
924 chan->last_acked_seq = control->reqseq;
925 __clear_ack_timer(chan);
926 }
927
928 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
929 control->final, control->poll, control->super);
930
931 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
932 control_field = __pack_extended_control(control);
933 else
934 control_field = __pack_enhanced_control(control);
935
936 skb = l2cap_create_sframe_pdu(chan, control_field);
937 if (!IS_ERR(skb))
938 l2cap_do_send(chan, skb);
b5c6aaed
MM		 939}
940
c9e3d5e0 941static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 942{
c9e3d5e0
MM		 943 struct l2cap_ctrl control;
944
945 BT_DBG("chan %p, poll %d", chan, poll);
946
947 memset(&control, 0, sizeof(control));
948 control.sframe = 1;
949 control.poll = poll;
950
951 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
952 control.super = L2CAP_SUPER_RNR;
953 else
954 control.super = L2CAP_SUPER_RR;
b5c6aaed 955
c9e3d5e0
MM		 956 control.reqseq = chan->buffer_seq;
957 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 958}
959
b4450035 960static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 961{
c1360a1c 962 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 963}
964
9b27f350
AE		 965static void l2cap_send_conn_req(struct l2cap_chan *chan)
966{
967 struct l2cap_conn *conn = chan->conn;
968 struct l2cap_conn_req req;
969
970 req.scid = cpu_to_le16(chan->scid);
971 req.psm = chan->psm;
972
973 chan->ident = l2cap_get_ident(conn);
974
975 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
976
977 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
978}
979
9f0caeb1
VCG		 980static void l2cap_chan_ready(struct l2cap_chan *chan)
981{
982 struct sock *sk = chan->sk;
983 struct sock *parent;
984
985 lock_sock(sk);
986
987 parent = bt_sk(sk)->parent;
988
989 BT_DBG("sk %p, parent %p", sk, parent);
990
2827011f 991 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 992 chan->conf_state = 0;
993 __clear_chan_timer(chan);
994
995 __l2cap_state_change(chan, BT_CONNECTED);
996 sk->sk_state_change(sk);
997
998 if (parent)
999 parent->sk_data_ready(parent, 0);
1000
1001 release_sock(sk);
1002}
1003
fc7f8a7e 1004static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1005{
8c1d787b 1006 struct l2cap_conn *conn = chan->conn;
79d554a6 1007
9f0caeb1
VCG		 1008 if (conn->hcon->type == LE_LINK) {
1009 l2cap_chan_ready(chan);
1010 return;
1011 }
1012
79d554a6 1013 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1014 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1015 return;
1016
d45fc423 1017 if (l2cap_chan_check_security(chan) &&
9b27f350
AE		 1018 __l2cap_no_conn_pending(chan))
1019 l2cap_send_conn_req(chan);
79d554a6
MH		 1020 } else {
1021 struct l2cap_info_req req;
1022 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1023
1024 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1025 conn->info_ident = l2cap_get_ident(conn);
1026
ba13ccd9 1027 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6
MH		 1028
1029 l2cap_send_cmd(conn, conn->info_ident,
1030 L2CAP_INFO_REQ, sizeof(req), &req);
1031 }
1032}
1033
cf6c2c0b
GP		 1034static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1035{
1036 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1037 if (!disable_ertm)
cf6c2c0b
GP		 1038 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1039
1040 switch (mode) {
1041 case L2CAP_MODE_ERTM:
1042 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1043 case L2CAP_MODE_STREAMING:
1044 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1045 default:
1046 return 0x00;
1047 }
1048}
1049
4519de9a 1050static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
22121fc9 1051{
6be36555 1052 struct sock *sk = chan->sk;
22121fc9
GP		 1053 struct l2cap_disconn_req req;
1054
c13ffa62
GP		 1055 if (!conn)
1056 return;
1057
0c1bc5c6 1058 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 1059 __clear_retrans_timer(chan);
1060 __clear_monitor_timer(chan);
1061 __clear_ack_timer(chan);
c13ffa62
GP		 1062 }
1063
fe4128e0
GP		 1064 req.dcid = cpu_to_le16(chan->dcid);
1065 req.scid = cpu_to_le16(chan->scid);
22121fc9
GP		 1066 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1067 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62 1068
6be36555 1069 lock_sock(sk);
0e587be7 1070 __l2cap_state_change(chan, BT_DISCONN);
2e0052e4 1071 __l2cap_chan_set_err(chan, err);
6be36555 1072 release_sock(sk);
22121fc9
GP		 1073}
1074
1da177e4 1075/* ---- L2CAP connections ---- */
4e8402a3
MH		 1076static void l2cap_conn_start(struct l2cap_conn *conn)
1077{
3df91ea2 1078 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1079
1080 BT_DBG("conn %p", conn);
1081
3df91ea2 1082 mutex_lock(&conn->chan_lock);
4e8402a3 1083
3df91ea2 1084 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 1085 struct sock *sk = chan->sk;
baa7e1fa 1086
6be36555 1087 l2cap_chan_lock(chan);
4e8402a3 1088
715ec005 1089 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1090 l2cap_chan_unlock(chan);
79d554a6
MH		 1091 continue;
1092 }
1093
89bc500e 1094 if (chan->state == BT_CONNECT) {
d45fc423 1095 if (!l2cap_chan_check_security(chan) ||
b4450035 1096 !__l2cap_no_conn_pending(chan)) {
6be36555 1097 l2cap_chan_unlock(chan);
47731de7
GP		 1098 continue;
1099 }
79d554a6 1100
c1360a1c
GP		 1101 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1102 && test_bit(CONF_STATE2_DEVICE,
1103 &chan->conf_state)) {
89bc500e 1104 l2cap_chan_close(chan, ECONNRESET);
6be36555 1105 l2cap_chan_unlock(chan);
47731de7 1106 continue;
b1235d79 1107 }
47731de7 1108
9b27f350 1109 l2cap_send_conn_req(chan);
47731de7 1110
89bc500e 1111 } else if (chan->state == BT_CONNECT2) {
79d554a6 1112 struct l2cap_conn_rsp rsp;
e9aeb2dd 1113 char buf[128];
fe4128e0
GP		 1114 rsp.scid = cpu_to_le16(chan->dcid);
1115 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1116
d45fc423 1117 if (l2cap_chan_check_security(chan)) {
6be36555 1118 lock_sock(sk);
c5daa683
GP		 1119 if (test_bit(BT_SK_DEFER_SETUP,
1120 &bt_sk(sk)->flags)) {
f66dc81f
MH		 1121 struct sock *parent = bt_sk(sk)->parent;
1122 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1123 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
05e9a2f6
IK		 1124 if (parent)
1125 parent->sk_data_ready(parent, 0);
f66dc81f
MH		 1126
1127 } else {
0e587be7 1128 __l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 1129 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1130 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1131 }
6be36555 1132 release_sock(sk);
79d554a6
MH		 1133 } else {
1134 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1135 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
1136 }
1137
fc7f8a7e
GP		 1138 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1139 sizeof(rsp), &rsp);
e9aeb2dd 1140
c1360a1c 1141 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
e9aeb2dd 1142 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1143 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1144 continue;
1145 }
1146
c1360a1c 1147 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1148 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 1149 l2cap_build_conf_req(chan, buf), buf);
1150 chan->num_conf_req++;
4e8402a3
MH		 1151 }
1152
6be36555 1153 l2cap_chan_unlock(chan);
4e8402a3
MH		 1154 }
1155
3df91ea2 1156 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1157}
1158
c2287681 1159/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1160 * Returns closest match, locked.
1161 */
d9b88702 1162static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1163 bdaddr_t *src,
1164 bdaddr_t *dst)
b62f328b 1165{
23691d75 1166 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1167
23691d75 1168 read_lock(&chan_list_lock);
b62f328b 1169
23691d75
GP		 1170 list_for_each_entry(c, &chan_list, global_l) {
1171 struct sock *sk = c->sk;
fe4128e0 1172
89bc500e 1173 if (state && c->state != state)
b62f328b
VT		 1174 continue;
1175
23691d75 1176 if (c->scid == cid) {
c2287681
IY		 1177 int src_match, dst_match;
1178 int src_any, dst_any;
1179
b62f328b 1180 /* Exact match. */
c2287681
IY		 1181 src_match = !bacmp(&bt_sk(sk)->src, src);
1182 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1183 if (src_match && dst_match) {
23691d75
GP		 1184 read_unlock(&chan_list_lock);
1185 return c;
1186 }
b62f328b
VT		 1187
1188 /* Closest match */
c2287681
IY		 1189 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1190 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1191 if ((src_match && dst_any) || (src_any && dst_match) ||
1192 (src_any && dst_any))
23691d75 1193 c1 = c;
b62f328b
VT		 1194 }
1195 }
280f294f 1196
23691d75 1197 read_unlock(&chan_list_lock);
b62f328b 1198
23691d75 1199 return c1;
b62f328b
VT		 1200}
1201
1202static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1203{
c916fbe4 1204 struct sock *parent, *sk;
23691d75 1205 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 1206
1207 BT_DBG("");
1208
1209 /* Check if we have socket listening on cid */
23691d75 1210 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
c2287681 1211 conn->src, conn->dst);
23691d75 1212 if (!pchan)
b62f328b
VT		 1213 return;
1214
23691d75
GP		 1215 parent = pchan->sk;
1216
aa2ac881 1217 lock_sock(parent);
62f3a2cf 1218
b62f328b
VT		 1219 /* Check for backlog size */
1220 if (sk_acceptq_is_full(parent)) {
1221 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1222 goto clean;
1223 }
1224
80808e43
GP		 1225 chan = pchan->ops->new_connection(pchan->data);
1226 if (!chan)
b62f328b
VT		 1227 goto clean;
1228
80808e43 1229 sk = chan->sk;
5d41ce1d 1230
b62f328b
VT		 1231 hci_conn_hold(conn->hcon);
1232
b62f328b
VT		 1233 bacpy(&bt_sk(sk)->src, conn->src);
1234 bacpy(&bt_sk(sk)->dst, conn->dst);
1235
d1010240
GP		 1236 bt_accept_enqueue(parent, sk);
1237
3d57dc68 1238 l2cap_chan_add(conn, chan);
48454079 1239
c9b66675 1240 __set_chan_timer(chan, sk->sk_sndtimeo);
b62f328b 1241
0e587be7 1242 __l2cap_state_change(chan, BT_CONNECTED);
b62f328b
VT		 1243 parent->sk_data_ready(parent, 0);
1244
b62f328b 1245clean:
aa2ac881 1246 release_sock(parent);
b62f328b
VT		 1247}
1248
4e8402a3
MH		 1249static void l2cap_conn_ready(struct l2cap_conn *conn)
1250{
48454079 1251 struct l2cap_chan *chan;
4e8402a3 1252
79d554a6 1253 BT_DBG("conn %p", conn);
4e8402a3 1254
b62f328b
VT		 1255 if (!conn->hcon->out && conn->hcon->type == LE_LINK)
1256 l2cap_le_conn_ready(conn);
1257
160dc6ac
VCG		 1258 if (conn->hcon->out && conn->hcon->type == LE_LINK)
1259 smp_conn_security(conn, conn->hcon->pending_sec_level);
1260
3df91ea2 1261 mutex_lock(&conn->chan_lock);
4e8402a3 1262
3df91ea2 1263 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1264
6be36555 1265 l2cap_chan_lock(chan);
4e8402a3 1266
63128451 1267 if (conn->hcon->type == LE_LINK) {
b501d6a1 1268 if (smp_conn_security(conn, chan->sec_level))
cf4cd009 1269 l2cap_chan_ready(chan);
acd7d370 1270
63128451 1271 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1272 struct sock *sk = chan->sk;
c9b66675 1273 __clear_chan_timer(chan);
6be36555 1274 lock_sock(sk);
0e587be7 1275 __l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1276 sk->sk_state_change(sk);
6be36555 1277 release_sock(sk);
b501d6a1 1278
89bc500e 1279 } else if (chan->state == BT_CONNECT)
fc7f8a7e 1280 l2cap_do_start(chan);
4e8402a3 1281
6be36555 1282 l2cap_chan_unlock(chan);
4e8402a3 1283 }
79d554a6 1284
3df91ea2 1285 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1286}
1287
1288/* Notify sockets that we cannot guaranty reliability anymore */
1289static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1290{
48454079 1291 struct l2cap_chan *chan;
4e8402a3
MH		 1292
1293 BT_DBG("conn %p", conn);
1294
3df91ea2 1295 mutex_lock(&conn->chan_lock);
4e8402a3 1296
3df91ea2 1297 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1298 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
2e0052e4 1299 __l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1300 }
1301
3df91ea2 1302 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1303}
1304
f878fcad 1305static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1306{
f878fcad 1307 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
030013d8 1308 info_timer.work);
4e8402a3 1309
984947dc 1310 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1311 conn->info_ident = 0;
984947dc 1312
4e8402a3
MH		 1313 l2cap_conn_start(conn);
1314}
1315
5d3de7df
VCG		 1316static void l2cap_conn_del(struct hci_conn *hcon, int err)
1317{
1318 struct l2cap_conn *conn = hcon->l2cap_data;
1319 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1320
1321 if (!conn)
1322 return;
1323
1324 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1325
1326 kfree_skb(conn->rx_skb);
1327
3df91ea2
AE		 1328 mutex_lock(&conn->chan_lock);
1329
5d3de7df
VCG		 1330 /* Kill channels */
1331 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1332 l2cap_chan_hold(chan);
6be36555
AE		 1333 l2cap_chan_lock(chan);
1334
5d3de7df 1335 l2cap_chan_del(chan, err);
6be36555
AE		 1336
1337 l2cap_chan_unlock(chan);
1338
5d3de7df 1339 chan->ops->close(chan->data);
61d6ef3e 1340 l2cap_chan_put(chan);
5d3de7df
VCG		 1341 }
1342
3df91ea2
AE		 1343 mutex_unlock(&conn->chan_lock);
1344
73d80deb
LAD		 1345 hci_chan_del(conn->hchan);
1346
5d3de7df 1347 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1348 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1349
51a8efd7 1350 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1351 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1352 smp_chan_destroy(conn);
d26a2345 1353 }
5d3de7df
VCG		 1354
1355 hcon->l2cap_data = NULL;
1356 kfree(conn);
1357}
1358
6c9d42a1 1359static void security_timeout(struct work_struct *work)
5d3de7df 1360{
6c9d42a1
GP		 1361 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1362 security_timer.work);
5d3de7df
VCG		 1363
1364 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1365}
1366
1da177e4
LT		 1367static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1368{
0139418c 1369 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1370 struct hci_chan *hchan;
1da177e4 1371
0139418c 1372 if (conn || status)
1da177e4
LT		 1373 return conn;
1374
73d80deb
LAD		 1375 hchan = hci_chan_create(hcon);
1376 if (!hchan)
1377 return NULL;
1378
0139418c 1379 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
73d80deb
LAD		 1380 if (!conn) {
1381 hci_chan_del(hchan);
1da177e4 1382 return NULL;
73d80deb 1383 }
1da177e4
LT		 1384
1385 hcon->l2cap_data = conn;
1386 conn->hcon = hcon;
73d80deb 1387 conn->hchan = hchan;
1da177e4 1388
73d80deb 1389 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1390
acd7d370
VT		 1391 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
1392 conn->mtu = hcon->hdev->le_mtu;
1393 else
1394 conn->mtu = hcon->hdev->acl_mtu;
1395
1da177e4
LT		 1396 conn->src = &hcon->hdev->bdaddr;
1397 conn->dst = &hcon->dst;
1398
4e8402a3
MH		 1399 conn->feat_mask = 0;
1400
1da177e4 1401 spin_lock_init(&conn->lock);
3df91ea2 1402 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1403
1404 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1405
5d3de7df 1406 if (hcon->type == LE_LINK)
6c9d42a1 1407 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1408 else
030013d8 1409 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1410
9f5a0d7b 1411 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1412
1da177e4
LT		 1413 return conn;
1414}
1415
1da177e4 1416/* ---- Socket interface ---- */
1da177e4 1417
c2287681 1418/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1419 * Returns closest match.
1420 */
c2287681
IY		 1421static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1422 bdaddr_t *src,
1423 bdaddr_t *dst)
1da177e4 1424{
23691d75 1425 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1426
23691d75 1427 read_lock(&chan_list_lock);
e0f0cb56 1428
23691d75
GP		 1429 list_for_each_entry(c, &chan_list, global_l) {
1430 struct sock *sk = c->sk;
fe4128e0 1431
89bc500e 1432 if (state && c->state != state)
1da177e4
LT		 1433 continue;
1434
23691d75 1435 if (c->psm == psm) {
c2287681
IY		 1436 int src_match, dst_match;
1437 int src_any, dst_any;
1438
1da177e4 1439 /* Exact match. */
c2287681
IY		 1440 src_match = !bacmp(&bt_sk(sk)->src, src);
1441 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1442 if (src_match && dst_match) {
a7567b20 1443 read_unlock(&chan_list_lock);
23691d75
GP		 1444 return c;
1445 }
1da177e4
LT		 1446
1447 /* Closest match */
c2287681
IY		 1448 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1449 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1450 if ((src_match && dst_any) || (src_any && dst_match) ||
1451 (src_any && dst_any))
23691d75 1452 c1 = c;
1da177e4
LT		 1453 }
1454 }
1da177e4 1455
23691d75 1456 read_unlock(&chan_list_lock);
e0f0cb56 1457
23691d75 1458 return c1;
1da177e4
LT		 1459}
1460
8e9f9892
AG		 1461int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1462 bdaddr_t *dst, u8 dst_type)
1da177e4 1463{
5d41ce1d 1464 struct sock *sk = chan->sk;
1da177e4 1465 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1466 struct l2cap_conn *conn;
1467 struct hci_conn *hcon;
1468 struct hci_dev *hdev;
09ab6f4c 1469 __u8 auth_type;
44d0e48e 1470 int err;
1da177e4 1471
8e9f9892
AG		 1472 BT_DBG("%s -> %s (type %u) psm 0x%2.2x", batostr(src), batostr(dst),
1473 dst_type, __le16_to_cpu(chan->psm));
1da177e4 1474
af05b30b
GP		 1475 hdev = hci_get_route(dst, src);
1476 if (!hdev)
1da177e4
LT		 1477 return -EHOSTUNREACH;
1478
09fd0de5 1479 hci_dev_lock(hdev);
1da177e4 1480
6be36555 1481 l2cap_chan_lock(chan);
03a00194
GP		 1482
1483 /* PSM must be odd and lsb of upper byte must be 0 */
1484 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1485 chan->chan_type != L2CAP_CHAN_RAW) {
1486 err = -EINVAL;
1487 goto done;
1488 }
1489
1490 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1491 err = -EINVAL;
1492 goto done;
1493 }
1494
1495 switch (chan->mode) {
1496 case L2CAP_MODE_BASIC:
1497 break;
1498 case L2CAP_MODE_ERTM:
1499 case L2CAP_MODE_STREAMING:
1500 if (!disable_ertm)
1501 break;
1502 /* fall through */
1503 default:
1504 err = -ENOTSUPP;
1505 goto done;
1506 }
1507
6be36555
AE		 1508 lock_sock(sk);
1509
03a00194
GP		 1510 switch (sk->sk_state) {
1511 case BT_CONNECT:
1512 case BT_CONNECT2:
1513 case BT_CONFIG:
1514 /* Already connecting */
1515 err = 0;
6be36555 1516 release_sock(sk);
03a00194
GP		 1517 goto done;
1518
1519 case BT_CONNECTED:
1520 /* Already connected */
1521 err = -EISCONN;
6be36555 1522 release_sock(sk);
03a00194
GP		 1523 goto done;
1524
1525 case BT_OPEN:
1526 case BT_BOUND:
1527 /* Can connect */
1528 break;
1529
1530 default:
1531 err = -EBADFD;
6be36555 1532 release_sock(sk);
03a00194
GP		 1533 goto done;
1534 }
1535
1536 /* Set destination address and psm */
9219b2a0 1537 bacpy(&bt_sk(sk)->dst, dst);
6be36555
AE		 1538
1539 release_sock(sk);
1540
03a00194
GP		 1541 chan->psm = psm;
1542 chan->dcid = cid;
1da177e4 1543
4343478f 1544 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1545
fe4128e0 1546 if (chan->dcid == L2CAP_CID_LE_DATA)
8e9f9892 1547 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1548 chan->sec_level, auth_type);
acd7d370 1549 else
8e9f9892 1550 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1551 chan->sec_level, auth_type);
acd7d370 1552
30e76272
VT		 1553 if (IS_ERR(hcon)) {
1554 err = PTR_ERR(hcon);
1da177e4 1555 goto done;
30e76272 1556 }
1da177e4
LT		 1557
1558 conn = l2cap_conn_add(hcon, 0);
1559 if (!conn) {
1560 hci_conn_put(hcon);
30e76272 1561 err = -ENOMEM;
1da177e4
LT		 1562 goto done;
1563 }
1564
9f0caeb1
VCG		 1565 if (hcon->type == LE_LINK) {
1566 err = 0;
1567
1568 if (!list_empty(&conn->chan_l)) {
1569 err = -EBUSY;
1570 hci_conn_put(hcon);
1571 }
1572
1573 if (err)
1574 goto done;
1575 }
1576
1da177e4
LT		 1577 /* Update source addr of the socket */
1578 bacpy(src, conn->src);
1579
6be36555 1580 l2cap_chan_unlock(chan);
48454079 1581 l2cap_chan_add(conn, chan);
6be36555 1582 l2cap_chan_lock(chan);
48454079 1583
6be36555 1584 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1585 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1586
1587 if (hcon->state == BT_CONNECTED) {
715ec005 1588 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1589 __clear_chan_timer(chan);
d45fc423 1590 if (l2cap_chan_check_security(chan))
6be36555 1591 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1592 } else
fc7f8a7e 1593 l2cap_do_start(chan);
1da177e4
LT		 1594 }
1595
30e76272
VT		 1596 err = 0;
1597
1da177e4 1598done:
6be36555 1599 l2cap_chan_unlock(chan);
09fd0de5 1600 hci_dev_unlock(hdev);
1da177e4
LT		 1601 hci_dev_put(hdev);
1602 return err;
1603}
1604
dcba0dba 1605int __l2cap_wait_ack(struct sock *sk)
6161c038 1606{
8c1d787b 1607 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1608 DECLARE_WAITQUEUE(wait, current);
1609 int err = 0;
1610 int timeo = HZ/5;
1611
2b0b05dd 1612 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1613 set_current_state(TASK_INTERRUPTIBLE);
1614 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1615 if (!timeo)
1616 timeo = HZ/5;
1617
1618 if (signal_pending(current)) {
1619 err = sock_intr_errno(timeo);
1620 break;
1621 }
1622
1623 release_sock(sk);
1624 timeo = schedule_timeout(timeo);
1625 lock_sock(sk);
a71a0cf4 1626 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1627
1628 err = sock_error(sk);
1629 if (err)
1630 break;
1631 }
1632 set_current_state(TASK_RUNNING);
2b0b05dd 1633 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1634 return err;
1635}
1636
721c4181 1637static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1638{
721c4181 1639 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1640 monitor_timer.work);
e90bac06 1641
525cd185 1642 BT_DBG("chan %p", chan);
0e98958d 1643
6be36555
AE		 1644 l2cap_chan_lock(chan);
1645
80909e04 1646 if (!chan->conn) {
6be36555 1647 l2cap_chan_unlock(chan);
8d7e1c7f 1648 l2cap_chan_put(chan);
e90bac06
GP		 1649 return;
1650 }
1651
80909e04 1652 l2cap_tx(chan, 0, 0, L2CAP_EV_MONITOR_TO);
e90bac06 1653
6be36555 1654 l2cap_chan_unlock(chan);
8d7e1c7f 1655 l2cap_chan_put(chan);
e90bac06
GP		 1656}
1657
721c4181 1658static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1659{
721c4181 1660 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1661 retrans_timer.work);
e90bac06 1662
49208c9c 1663 BT_DBG("chan %p", chan);
0e98958d 1664
6be36555
AE		 1665 l2cap_chan_lock(chan);
1666
80909e04
MM		 1667 if (!chan->conn) {
1668 l2cap_chan_unlock(chan);
1669 l2cap_chan_put(chan);
1670 return;
1671 }
6be36555 1672
80909e04 1673 l2cap_tx(chan, 0, 0, L2CAP_EV_RETRANS_TO);
6be36555 1674 l2cap_chan_unlock(chan);
8d7e1c7f 1675 l2cap_chan_put(chan);
e90bac06
GP		 1676}
1677
3733937d
MM		 1678static int l2cap_streaming_send(struct l2cap_chan *chan,
1679 struct sk_buff_head *skbs)
6840ed07 1680{
ccbb84af 1681 struct sk_buff *skb;
3733937d 1682 struct l2cap_ctrl *control;
6840ed07 1683
3733937d
MM		 1684 BT_DBG("chan %p, skbs %p", chan, skbs);
1685
1686 if (chan->state != BT_CONNECTED)
1687 return -ENOTCONN;
1688
1689 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1690
1691 while (!skb_queue_empty(&chan->tx_q)) {
1692
1693 skb = skb_dequeue(&chan->tx_q);
1694
1695 bt_cb(skb)->control.retries = 1;
1696 control = &bt_cb(skb)->control;
1697
1698 control->reqseq = 0;
1699 control->txseq = chan->next_tx_seq;
1700
1701 __pack_control(chan, control, skb);
6840ed07 1702
47d1ec61 1703 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1704 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1705 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1706 }
1707
4343478f 1708 l2cap_do_send(chan, skb);
6840ed07 1709
3733937d
MM		 1710 BT_DBG("Sent txseq %d", (int)control->txseq);
1711
836be934 1712 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1713 chan->frames_sent++;
6840ed07 1714 }
3733937d
MM		 1715
1716 return 0;
6840ed07
GP		 1717}
1718
67c9e840 1719static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1720{
1721 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1722 struct l2cap_ctrl *control;
1723 int sent = 0;
1724
1725 BT_DBG("chan %p", chan);
1c2acffb 1726
89bc500e 1727 if (chan->state != BT_CONNECTED)
c13ffa62 1728 return -ENOTCONN;
e90bac06 1729
94122bbe
MM		 1730 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1731 return 0;
1732
18a48e76
MM		 1733 while (chan->tx_send_head &&
1734 chan->unacked_frames < chan->remote_tx_win &&
1735 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1736
18a48e76 1737 skb = chan->tx_send_head;
e90bac06 1738
18a48e76
MM		 1739 bt_cb(skb)->control.retries = 1;
1740 control = &bt_cb(skb)->control;
95ffa978 1741
e2ab4353 1742 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1743 control->final = 1;
e2ab4353 1744
18a48e76
MM		 1745 control->reqseq = chan->buffer_seq;
1746 chan->last_acked_seq = chan->buffer_seq;
1747 control->txseq = chan->next_tx_seq;
1c2acffb 1748
18a48e76 1749 __pack_control(chan, control, skb);
e90bac06 1750
47d1ec61 1751 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1752 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1753 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1754 }
1755
18a48e76
MM		 1756 /* Clone after data has been modified. Data is assumed to be
1757 read-only (for locking purposes) on cloned sk_buffs.
1758 */
1759 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1760
18a48e76
MM		 1761 if (!tx_skb)
1762 break;
1c2acffb 1763
18a48e76 1764 __set_retrans_timer(chan);
836be934
AE		 1765
1766 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1767 chan->unacked_frames++;
6a026610 1768 chan->frames_sent++;
18a48e76 1769 sent++;
1c2acffb 1770
58d35f87
GP		 1771 if (skb_queue_is_last(&chan->tx_q, skb))
1772 chan->tx_send_head = NULL;
1c2acffb 1773 else
58d35f87 1774 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1775
1776 l2cap_do_send(chan, tx_skb);
1777 BT_DBG("Sent txseq %d", (int)control->txseq);
1c2acffb
GP		 1778 }
1779
18a48e76
MM		 1780 BT_DBG("Sent %d, %d unacked, %d in ERTM queue", sent,
1781 (int) chan->unacked_frames, skb_queue_len(&chan->tx_q));
1782
1783 return sent;
9e917af1
GP		 1784}
1785
e1fbd4c1
MM		 1786static void l2cap_ertm_resend(struct l2cap_chan *chan)
1787{
1788 struct l2cap_ctrl control;
1789 struct sk_buff *skb;
1790 struct sk_buff *tx_skb;
1791 u16 seq;
1792
1793 BT_DBG("chan %p", chan);
1794
1795 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1796 return;
1797
1798 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1799 seq = l2cap_seq_list_pop(&chan->retrans_list);
1800
1801 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1802 if (!skb) {
1803 BT_DBG("Error: Can't retransmit seq %d, frame missing",
1804 seq);
1805 continue;
1806 }
1807
1808 bt_cb(skb)->control.retries++;
1809 control = bt_cb(skb)->control;
1810
1811 if (chan->max_tx != 0 &&
1812 bt_cb(skb)->control.retries > chan->max_tx) {
1813 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
1814 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
1815 l2cap_seq_list_clear(&chan->retrans_list);
1816 break;
1817 }
1818
1819 control.reqseq = chan->buffer_seq;
1820 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1821 control.final = 1;
1822 else
1823 control.final = 0;
1824
1825 if (skb_cloned(skb)) {
1826 /* Cloned sk_buffs are read-only, so we need a
1827 * writeable copy
1828 */
1829 tx_skb = skb_copy(skb, GFP_ATOMIC);
1830 } else {
1831 tx_skb = skb_clone(skb, GFP_ATOMIC);
1832 }
1833
1834 if (!tx_skb) {
1835 l2cap_seq_list_clear(&chan->retrans_list);
1836 break;
1837 }
1838
1839 /* Update skb contents */
1840 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1841 put_unaligned_le32(__pack_extended_control(&control),
1842 tx_skb->data + L2CAP_HDR_SIZE);
1843 } else {
1844 put_unaligned_le16(__pack_enhanced_control(&control),
1845 tx_skb->data + L2CAP_HDR_SIZE);
1846 }
1847
1848 if (chan->fcs == L2CAP_FCS_CRC16) {
1849 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
1850 put_unaligned_le16(fcs, skb_put(tx_skb,
1851 L2CAP_FCS_SIZE));
1852 }
1853
1854 l2cap_do_send(chan, tx_skb);
1855
1856 BT_DBG("Resent txseq %d", control.txseq);
1857
1858 chan->last_acked_seq = chan->buffer_seq;
1859 }
1860}
1861
f80842a8
MM		 1862static void l2cap_retransmit(struct l2cap_chan *chan,
1863 struct l2cap_ctrl *control)
1864{
1865 BT_DBG("chan %p, control %p", chan, control);
1866
1867 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
1868 l2cap_ertm_resend(chan);
1869}
1870
d2a7ac5d
MM		 1871static void l2cap_retransmit_all(struct l2cap_chan *chan,
1872 struct l2cap_ctrl *control)
1873{
e1fbd4c1
MM		 1874 struct sk_buff *skb;
1875
1876 BT_DBG("chan %p, control %p", chan, control);
1877
1878 if (control->poll)
1879 set_bit(CONN_SEND_FBIT, &chan->conn_state);
1880
1881 l2cap_seq_list_clear(&chan->retrans_list);
1882
1883 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1884 return;
1885
1886 if (chan->unacked_frames) {
1887 skb_queue_walk(&chan->tx_q, skb) {
1888 if (bt_cb(skb)->control.txseq == control->reqseq ||
1889 skb == chan->tx_send_head)
1890 break;
1891 }
1892
1893 skb_queue_walk_from(&chan->tx_q, skb) {
1894 if (skb == chan->tx_send_head)
1895 break;
1896
1897 l2cap_seq_list_append(&chan->retrans_list,
1898 bt_cb(skb)->control.txseq);
1899 }
1900
1901 l2cap_ertm_resend(chan);
1902 }
d2a7ac5d
MM		 1903}
1904
0a0aba42 1905static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 1906{
0a0aba42
MM		 1907 struct l2cap_ctrl control;
1908 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
1909 chan->last_acked_seq);
1910 int threshold;
9e917af1 1911
0a0aba42
MM		 1912 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
1913 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 1914
0a0aba42
MM		 1915 memset(&control, 0, sizeof(control));
1916 control.sframe = 1;
dfc909be 1917
0a0aba42
MM		 1918 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
1919 chan->rx_state == L2CAP_RX_STATE_RECV) {
1920 __clear_ack_timer(chan);
1921 control.super = L2CAP_SUPER_RNR;
1922 control.reqseq = chan->buffer_seq;
1923 l2cap_send_sframe(chan, &control);
1924 } else {
1925 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
1926 l2cap_ertm_send(chan);
1927 /* If any i-frames were sent, they included an ack */
1928 if (chan->buffer_seq == chan->last_acked_seq)
1929 frames_to_ack = 0;
1930 }
dfc909be 1931
0a0aba42
MM		 1932 /* Ack now if the tx window is 3/4ths full.
1933 * Calculate without mul or div
1934 */
1935 threshold = chan->tx_win;
1936 threshold += threshold << 1;
1937 threshold >>= 2;
1938
1939 BT_DBG("frames_to_ack %d, threshold %d", (int)frames_to_ack,
1940 threshold);
1941
1942 if (frames_to_ack >= threshold) {
1943 __clear_ack_timer(chan);
1944 control.super = L2CAP_SUPER_RR;
1945 control.reqseq = chan->buffer_seq;
1946 l2cap_send_sframe(chan, &control);
1947 frames_to_ack = 0;
1948 }
1c2acffb 1949
0a0aba42
MM		 1950 if (frames_to_ack)
1951 __set_ack_timer(chan);
1952 }
b17e73bb
SJ		 1953}
1954
04124681
GP		 1955static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
1956 struct msghdr *msg, int len,
1957 int count, struct sk_buff *skb)
1c2acffb 1958{
0952a57a 1959 struct l2cap_conn *conn = chan->conn;
1c2acffb 1960 struct sk_buff **frag;
90338947 1961 int sent = 0;
1da177e4 1962
59203a21 1963 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1964 return -EFAULT;
1da177e4
LT		 1965
1966 sent += count;
1967 len -= count;
1968
1969 /* Continuation fragments (no L2CAP header) */
1970 frag = &skb_shinfo(skb)->frag_list;
1971 while (len) {
fbe00700
GP		 1972 struct sk_buff *tmp;
1973
1da177e4
LT		 1974 count = min_t(unsigned int, conn->mtu, len);
1975
fbe00700
GP		 1976 tmp = chan->ops->alloc_skb(chan, count,
1977 msg->msg_flags & MSG_DONTWAIT);
1978 if (IS_ERR(tmp))
1979 return PTR_ERR(tmp);
1980
1981 *frag = tmp;
2f7719ce 1982
1c2acffb
GP		 1983 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1984 return -EFAULT;
1da177e4 1985
5e59b791
LAD		 1986 (*frag)->priority = skb->priority;
1987
1da177e4
LT		 1988 sent += count;
1989 len -= count;
1990
2d0ed3d5
GP		 1991 skb->len += (*frag)->len;
1992 skb->data_len += (*frag)->len;
1993
1da177e4
LT		 1994 frag = &(*frag)->next;
1995 }
1da177e4
LT		 1996
1997 return sent;
1c2acffb 1998}
1da177e4 1999
5e59b791
LAD		 2000static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
2001 struct msghdr *msg, size_t len,
2002 u32 priority)
1c2acffb 2003{
8c1d787b 2004 struct l2cap_conn *conn = chan->conn;
1c2acffb 2005 struct sk_buff *skb;
03a51213 2006 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2007 struct l2cap_hdr *lh;
2008
6d5922b0 2009 BT_DBG("chan %p len %d priority %u", chan, (int)len, priority);
1c2acffb
GP		 2010
2011 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2012
2013 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2014 msg->msg_flags & MSG_DONTWAIT);
2015 if (IS_ERR(skb))
2016 return skb;
1c2acffb 2017
5e59b791
LAD		 2018 skb->priority = priority;
2019
1c2acffb
GP		 2020 /* Create L2CAP header */
2021 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2022 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c
AE		 2023 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2024 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2025
0952a57a 2026 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2027 if (unlikely(err < 0)) {
2028 kfree_skb(skb);
2029 return ERR_PTR(err);
2030 }
2031 return skb;
2032}
2033
5e59b791
LAD		 2034static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
2035 struct msghdr *msg, size_t len,
2036 u32 priority)
1c2acffb 2037{
8c1d787b 2038 struct l2cap_conn *conn = chan->conn;
1c2acffb 2039 struct sk_buff *skb;
f2ba7fae 2040 int err, count;
1c2acffb
GP		 2041 struct l2cap_hdr *lh;
2042
6d5922b0 2043 BT_DBG("chan %p len %d", chan, (int)len);
1c2acffb 2044
f2ba7fae 2045 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2046
f2ba7fae 2047 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2048 msg->msg_flags & MSG_DONTWAIT);
2049 if (IS_ERR(skb))
2050 return skb;
1c2acffb 2051
5e59b791
LAD		 2052 skb->priority = priority;
2053
1c2acffb
GP		 2054 /* Create L2CAP header */
2055 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2056 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2057 lh->len = cpu_to_le16(len);
1c2acffb 2058
0952a57a 2059 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2060 if (unlikely(err < 0)) {
2061 kfree_skb(skb);
2062 return ERR_PTR(err);
2063 }
2064 return skb;
2065}
2066
ab0ff76d
LAD		 2067static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
2068 struct msghdr *msg, size_t len,
94122bbe 2069 u16 sdulen)
1c2acffb 2070{
8c1d787b 2071 struct l2cap_conn *conn = chan->conn;
1c2acffb 2072 struct sk_buff *skb;
e4ca6d98 2073 int err, count, hlen;
1c2acffb
GP		 2074 struct l2cap_hdr *lh;
2075
6d5922b0 2076 BT_DBG("chan %p len %d", chan, (int)len);
1c2acffb 2077
0ee0d208
GP		 2078 if (!conn)
2079 return ERR_PTR(-ENOTCONN);
2080
e4ca6d98
AE		 2081 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2082 hlen = L2CAP_EXT_HDR_SIZE;
2083 else
2084 hlen = L2CAP_ENH_HDR_SIZE;
2085
c74e560c 2086 if (sdulen)
03a51213 2087 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2088
47d1ec61 2089 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2090 hlen += L2CAP_FCS_SIZE;
fcc203c3 2091
1c2acffb 2092 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2093
2094 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2095 msg->msg_flags & MSG_DONTWAIT);
2096 if (IS_ERR(skb))
2097 return skb;
1c2acffb
GP		 2098
2099 /* Create L2CAP header */
2100 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2101 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2102 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2103
18a48e76
MM		 2104 /* Control header is populated later */
2105 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2106 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2107 else
2108 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2109
c74e560c 2110 if (sdulen)
03a51213 2111 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2112
0952a57a 2113 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2114 if (unlikely(err < 0)) {
2115 kfree_skb(skb);
2116 return ERR_PTR(err);
2117 }
e90bac06 2118
18a48e76 2119 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2120 bt_cb(skb)->control.retries = 0;
1c2acffb 2121 return skb;
1da177e4
LT		 2122}
2123
94122bbe
MM		 2124static int l2cap_segment_sdu(struct l2cap_chan *chan,
2125 struct sk_buff_head *seg_queue,
2126 struct msghdr *msg, size_t len)
c74e560c 2127{
c74e560c 2128 struct sk_buff *skb;
94122bbe
MM		 2129 u16 sdu_len;
2130 size_t pdu_len;
2131 int err = 0;
2132 u8 sar;
c74e560c 2133
94122bbe 2134 BT_DBG("chan %p, msg %p, len %d", chan, msg, (int)len);
c74e560c 2135
94122bbe
MM		 2136 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2137 * so fragmented skbs are not used. The HCI layer's handling
2138 * of fragmented skbs is not compatible with ERTM's queueing.
2139 */
c74e560c 2140
94122bbe
MM		 2141 /* PDU size is derived from the HCI MTU */
2142 pdu_len = chan->conn->mtu;
c74e560c 2143
94122bbe
MM		 2144 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2145
2146 /* Adjust for largest possible L2CAP overhead. */
2147 pdu_len -= L2CAP_EXT_HDR_SIZE + L2CAP_FCS_SIZE;
2148
2149 /* Remote device may have requested smaller PDUs */
2150 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2151
2152 if (len <= pdu_len) {
2153 sar = L2CAP_SAR_UNSEGMENTED;
2154 sdu_len = 0;
2155 pdu_len = len;
2156 } else {
2157 sar = L2CAP_SAR_START;
2158 sdu_len = len;
2159 pdu_len -= L2CAP_SDULEN_SIZE;
2160 }
2161
2162 while (len > 0) {
2163 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2164
c74e560c 2165 if (IS_ERR(skb)) {
94122bbe 2166 __skb_queue_purge(seg_queue);
c74e560c
GP		 2167 return PTR_ERR(skb);
2168 }
2169
94122bbe
MM		 2170 bt_cb(skb)->control.sar = sar;
2171 __skb_queue_tail(seg_queue, skb);
2172
2173 len -= pdu_len;
2174 if (sdu_len) {
2175 sdu_len = 0;
2176 pdu_len += L2CAP_SDULEN_SIZE;
2177 }
2178
2179 if (len <= pdu_len) {
2180 sar = L2CAP_SAR_END;
2181 pdu_len = len;
2182 } else {
2183 sar = L2CAP_SAR_CONTINUE;
2184 }
c74e560c 2185 }
c74e560c 2186
94122bbe 2187 return err;
c74e560c
GP		 2188}
2189
5e59b791
LAD		 2190int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2191 u32 priority)
9a91a04a 2192{
9a91a04a 2193 struct sk_buff *skb;
9a91a04a 2194 int err;
94122bbe 2195 struct sk_buff_head seg_queue;
9a91a04a
GP		 2196
2197 /* Connectionless channel */
715ec005 2198 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2199 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2200 if (IS_ERR(skb))
2201 return PTR_ERR(skb);
2202
2203 l2cap_do_send(chan, skb);
2204 return len;
2205 }
2206
2207 switch (chan->mode) {
2208 case L2CAP_MODE_BASIC:
2209 /* Check outgoing MTU */
2210 if (len > chan->omtu)
2211 return -EMSGSIZE;
2212
2213 /* Create a basic PDU */
5e59b791 2214 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2215 if (IS_ERR(skb))
2216 return PTR_ERR(skb);
2217
2218 l2cap_do_send(chan, skb);
2219 err = len;
2220 break;
2221
2222 case L2CAP_MODE_ERTM:
2223 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2224 /* Check outgoing MTU */
2225 if (len > chan->omtu) {
2226 err = -EMSGSIZE;
2227 break;
2228 }
9a91a04a 2229
94122bbe 2230 __skb_queue_head_init(&seg_queue);
9a91a04a 2231
94122bbe
MM		 2232 /* Do segmentation before calling in to the state machine,
2233 * since it's possible to block while waiting for memory
2234 * allocation.
2235 */
2236 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2237
94122bbe
MM		 2238 /* The channel could have been closed while segmenting,
2239 * check that it is still connected.
2240 */
2241 if (chan->state != BT_CONNECTED) {
2242 __skb_queue_purge(&seg_queue);
2243 err = -ENOTCONN;
9a91a04a
GP		 2244 }
2245
94122bbe 2246 if (err)
9a91a04a 2247 break;
9a91a04a 2248
3733937d 2249 if (chan->mode == L2CAP_MODE_ERTM)
608bcc6d
MM		 2250 err = l2cap_tx(chan, 0, &seg_queue,
2251 L2CAP_EV_DATA_REQUEST);
3733937d
MM		 2252 else
2253 err = l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2254
608bcc6d 2255 if (!err)
9a91a04a
GP		 2256 err = len;
2257
94122bbe
MM		 2258 /* If the skbs were not queued for sending, they'll still be in
2259 * seg_queue and need to be purged.
2260 */
2261 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2262 break;
2263
2264 default:
2265 BT_DBG("bad state %1.1x", chan->mode);
2266 err = -EBADFD;
2267 }
2268
2269 return err;
2270}
2271
d2a7ac5d
MM		 2272static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2273{
bed68bde
MM		 2274 struct l2cap_ctrl control;
2275 u16 seq;
2276
2277 BT_DBG("chan %p, txseq %d", chan, txseq);
2278
2279 memset(&control, 0, sizeof(control));
2280 control.sframe = 1;
2281 control.super = L2CAP_SUPER_SREJ;
2282
2283 for (seq = chan->expected_tx_seq; seq != txseq;
2284 seq = __next_seq(chan, seq)) {
2285 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2286 control.reqseq = seq;
2287 l2cap_send_sframe(chan, &control);
2288 l2cap_seq_list_append(&chan->srej_list, seq);
2289 }
2290 }
2291
2292 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2293}
2294
2295static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2296{
bed68bde
MM		 2297 struct l2cap_ctrl control;
2298
2299 BT_DBG("chan %p", chan);
2300
2301 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2302 return;
2303
2304 memset(&control, 0, sizeof(control));
2305 control.sframe = 1;
2306 control.super = L2CAP_SUPER_SREJ;
2307 control.reqseq = chan->srej_list.tail;
2308 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2309}
2310
2311static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2312{
bed68bde
MM		 2313 struct l2cap_ctrl control;
2314 u16 initial_head;
2315 u16 seq;
2316
2317 BT_DBG("chan %p, txseq %d", chan, txseq);
2318
2319 memset(&control, 0, sizeof(control));
2320 control.sframe = 1;
2321 control.super = L2CAP_SUPER_SREJ;
2322
2323 /* Capture initial list head to allow only one pass through the list. */
2324 initial_head = chan->srej_list.head;
2325
2326 do {
2327 seq = l2cap_seq_list_pop(&chan->srej_list);
2328 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2329 break;
2330
2331 control.reqseq = seq;
2332 l2cap_send_sframe(chan, &control);
2333 l2cap_seq_list_append(&chan->srej_list, seq);
2334 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2335}
2336
608bcc6d
MM		 2337static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2338{
2339 struct sk_buff *acked_skb;
2340 u16 ackseq;
2341
2342 BT_DBG("chan %p, reqseq %d", chan, reqseq);
2343
2344 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2345 return;
2346
2347 BT_DBG("expected_ack_seq %d, unacked_frames %d",
2348 chan->expected_ack_seq, chan->unacked_frames);
2349
2350 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2351 ackseq = __next_seq(chan, ackseq)) {
2352
2353 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2354 if (acked_skb) {
2355 skb_unlink(acked_skb, &chan->tx_q);
2356 kfree_skb(acked_skb);
2357 chan->unacked_frames--;
2358 }
2359 }
2360
2361 chan->expected_ack_seq = reqseq;
2362
2363 if (chan->unacked_frames == 0)
2364 __clear_retrans_timer(chan);
2365
2366 BT_DBG("unacked_frames %d", (int) chan->unacked_frames);
2367}
2368
2369static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2370{
2371 BT_DBG("chan %p", chan);
2372
2373 chan->expected_tx_seq = chan->buffer_seq;
2374 l2cap_seq_list_clear(&chan->srej_list);
2375 skb_queue_purge(&chan->srej_q);
2376 chan->rx_state = L2CAP_RX_STATE_RECV;
2377}
2378
2379static int l2cap_tx_state_xmit(struct l2cap_chan *chan,
2380 struct l2cap_ctrl *control,
2381 struct sk_buff_head *skbs, u8 event)
2382{
2383 int err = 0;
2384
2385 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2386 event);
2387
2388 switch (event) {
2389 case L2CAP_EV_DATA_REQUEST:
2390 if (chan->tx_send_head == NULL)
2391 chan->tx_send_head = skb_peek(skbs);
2392
2393 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2394 l2cap_ertm_send(chan);
2395 break;
2396 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2397 BT_DBG("Enter LOCAL_BUSY");
2398 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2399
2400 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2401 /* The SREJ_SENT state must be aborted if we are to
2402 * enter the LOCAL_BUSY state.
2403 */
2404 l2cap_abort_rx_srej_sent(chan);
2405 }
2406
2407 l2cap_send_ack(chan);
2408
2409 break;
2410 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2411 BT_DBG("Exit LOCAL_BUSY");
2412 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2413
2414 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2415 struct l2cap_ctrl local_control;
2416
2417 memset(&local_control, 0, sizeof(local_control));
2418 local_control.sframe = 1;
2419 local_control.super = L2CAP_SUPER_RR;
2420 local_control.poll = 1;
2421 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2422 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2423
2424 chan->retry_count = 1;
2425 __set_monitor_timer(chan);
2426 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2427 }
2428 break;
2429 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2430 l2cap_process_reqseq(chan, control->reqseq);
2431 break;
2432 case L2CAP_EV_EXPLICIT_POLL:
2433 l2cap_send_rr_or_rnr(chan, 1);
2434 chan->retry_count = 1;
2435 __set_monitor_timer(chan);
2436 __clear_ack_timer(chan);
2437 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2438 break;
2439 case L2CAP_EV_RETRANS_TO:
2440 l2cap_send_rr_or_rnr(chan, 1);
2441 chan->retry_count = 1;
2442 __set_monitor_timer(chan);
2443 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2444 break;
2445 case L2CAP_EV_RECV_FBIT:
2446 /* Nothing to process */
2447 break;
2448 default:
2449 break;
2450 }
2451
2452 return err;
2453}
2454
2455static int l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2456 struct l2cap_ctrl *control,
2457 struct sk_buff_head *skbs, u8 event)
2458{
2459 int err = 0;
2460
2461 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2462 event);
2463
2464 switch (event) {
2465 case L2CAP_EV_DATA_REQUEST:
2466 if (chan->tx_send_head == NULL)
2467 chan->tx_send_head = skb_peek(skbs);
2468 /* Queue data, but don't send. */
2469 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2470 break;
2471 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2472 BT_DBG("Enter LOCAL_BUSY");
2473 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2474
2475 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2476 /* The SREJ_SENT state must be aborted if we are to
2477 * enter the LOCAL_BUSY state.
2478 */
2479 l2cap_abort_rx_srej_sent(chan);
2480 }
2481
2482 l2cap_send_ack(chan);
2483
2484 break;
2485 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2486 BT_DBG("Exit LOCAL_BUSY");
2487 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2488
2489 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2490 struct l2cap_ctrl local_control;
2491 memset(&local_control, 0, sizeof(local_control));
2492 local_control.sframe = 1;
2493 local_control.super = L2CAP_SUPER_RR;
2494 local_control.poll = 1;
2495 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2496 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2497
2498 chan->retry_count = 1;
2499 __set_monitor_timer(chan);
2500 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2501 }
2502 break;
2503 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2504 l2cap_process_reqseq(chan, control->reqseq);
2505
2506 /* Fall through */
2507
2508 case L2CAP_EV_RECV_FBIT:
2509 if (control && control->final) {
2510 __clear_monitor_timer(chan);
2511 if (chan->unacked_frames > 0)
2512 __set_retrans_timer(chan);
2513 chan->retry_count = 0;
2514 chan->tx_state = L2CAP_TX_STATE_XMIT;
2515 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2516 }
2517 break;
2518 case L2CAP_EV_EXPLICIT_POLL:
2519 /* Ignore */
2520 break;
2521 case L2CAP_EV_MONITOR_TO:
2522 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2523 l2cap_send_rr_or_rnr(chan, 1);
2524 __set_monitor_timer(chan);
2525 chan->retry_count++;
2526 } else {
2527 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
2528 }
2529 break;
2530 default:
2531 break;
2532 }
2533
2534 return err;
2535}
2536
2537static int l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2538 struct sk_buff_head *skbs, u8 event)
2539{
2540 int err = 0;
2541
2542 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2543 chan, control, skbs, event, chan->tx_state);
2544
2545 switch (chan->tx_state) {
2546 case L2CAP_TX_STATE_XMIT:
2547 err = l2cap_tx_state_xmit(chan, control, skbs, event);
2548 break;
2549 case L2CAP_TX_STATE_WAIT_F:
2550 err = l2cap_tx_state_wait_f(chan, control, skbs, event);
2551 break;
2552 default:
2553 /* Ignore event */
2554 break;
2555 }
2556
2557 return err;
2558}
2559
4b51dae9
MM		 2560static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2561 struct l2cap_ctrl *control)
2562{
2563 BT_DBG("chan %p, control %p", chan, control);
2564 l2cap_tx(chan, control, 0, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
2565}
2566
f80842a8
MM		 2567static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2568 struct l2cap_ctrl *control)
2569{
2570 BT_DBG("chan %p, control %p", chan, control);
2571 l2cap_tx(chan, control, 0, L2CAP_EV_RECV_FBIT);
2572}
2573
1da177e4
LT		 2574/* Copy frame to all raw sockets on that connection */
2575static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2576{
1da177e4 2577 struct sk_buff *nskb;
48454079 2578 struct l2cap_chan *chan;
1da177e4
LT		 2579
2580 BT_DBG("conn %p", conn);
2581
3df91ea2 2582 mutex_lock(&conn->chan_lock);
3d57dc68 2583
3df91ea2 2584 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2585 struct sock *sk = chan->sk;
715ec005 2586 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2587 continue;
2588
2589 /* Don't send frame to the socket it came from */
2590 if (skb->sk == sk)
2591 continue;
af05b30b
GP		 2592 nskb = skb_clone(skb, GFP_ATOMIC);
2593 if (!nskb)
1da177e4
LT		 2594 continue;
2595
23070494 2596 if (chan->ops->recv(chan->data, nskb))
1da177e4
LT		 2597 kfree_skb(nskb);
2598 }
3d57dc68 2599
3df91ea2 2600 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2601}
2602
2603/* ---- L2CAP signalling commands ---- */
2604static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2605 u8 code, u8 ident, u16 dlen, void *data)
2606{
2607 struct sk_buff *skb, **frag;
2608 struct l2cap_cmd_hdr *cmd;
2609 struct l2cap_hdr *lh;
2610 int len, count;
2611
af05b30b
GP		 2612 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2613 conn, code, ident, dlen);
1da177e4
LT		 2614
2615 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2616 count = min_t(unsigned int, conn->mtu, len);
2617
2618 skb = bt_skb_alloc(count, GFP_ATOMIC);
2619 if (!skb)
2620 return NULL;
2621
2622 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2623 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2624
2625 if (conn->hcon->type == LE_LINK)
2626 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
2627 else
2628 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2629
2630 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2631 cmd->code = code;
2632 cmd->ident = ident;
aca3192c 2633 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2634
2635 if (dlen) {
2636 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2637 memcpy(skb_put(skb, count), data, count);
2638 data += count;
2639 }
2640
2641 len -= skb->len;
2642
2643 /* Continuation fragments (no L2CAP header) */
2644 frag = &skb_shinfo(skb)->frag_list;
2645 while (len) {
2646 count = min_t(unsigned int, conn->mtu, len);
2647
2648 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2649 if (!*frag)
2650 goto fail;
2651
2652 memcpy(skb_put(*frag, count), data, count);
2653
2654 len -= count;
2655 data += count;
2656
2657 frag = &(*frag)->next;
2658 }
2659
2660 return skb;
2661
2662fail:
2663 kfree_skb(skb);
2664 return NULL;
2665}
2666
2667static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2668{
2669 struct l2cap_conf_opt *opt = *ptr;
2670 int len;
2671
2672 len = L2CAP_CONF_OPT_SIZE + opt->len;
2673 *ptr += len;
2674
2675 *type = opt->type;
2676 *olen = opt->len;
2677
2678 switch (opt->len) {
2679 case 1:
2680 *val = *((u8 *) opt->val);
2681 break;
2682
2683 case 2:
bfaaeb3e 2684 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2685 break;
2686
2687 case 4:
bfaaeb3e 2688 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2689 break;
2690
2691 default:
2692 *val = (unsigned long) opt->val;
2693 break;
2694 }
2695
2696 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2697 return len;
2698}
2699
1da177e4
LT		 2700static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2701{
2702 struct l2cap_conf_opt *opt = *ptr;
2703
2704 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2705
2706 opt->type = type;
2707 opt->len = len;
2708
2709 switch (len) {
2710 case 1:
2711 *((u8 *) opt->val) = val;
2712 break;
2713
2714 case 2:
4f8b691c 2715 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2716 break;
2717
2718 case 4:
4f8b691c 2719 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2720 break;
2721
2722 default:
2723 memcpy(opt->val, (void *) val, len);
2724 break;
2725 }
2726
2727 *ptr += L2CAP_CONF_OPT_SIZE + len;
2728}
2729
f89cef09
AE		 2730static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2731{
2732 struct l2cap_conf_efs efs;
2733
1ec918ce 2734 switch (chan->mode) {
f89cef09
AE		 2735 case L2CAP_MODE_ERTM:
2736 efs.id = chan->local_id;
2737 efs.stype = chan->local_stype;
2738 efs.msdu = cpu_to_le16(chan->local_msdu);
2739 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2740 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2741 efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO);
2742 break;
2743
2744 case L2CAP_MODE_STREAMING:
2745 efs.id = 1;
2746 efs.stype = L2CAP_SERV_BESTEFFORT;
2747 efs.msdu = cpu_to_le16(chan->local_msdu);
2748 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2749 efs.acc_lat = 0;
2750 efs.flush_to = 0;
2751 break;
2752
2753 default:
2754 return;
2755 }
2756
2757 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
2758 (unsigned long) &efs);
2759}
2760
721c4181 2761static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 2762{
721c4181
GP		 2763 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2764 ack_timer.work);
c1b4f43b 2765
2fb9b3d4
GP		 2766 BT_DBG("chan %p", chan);
2767
6be36555
AE		 2768 l2cap_chan_lock(chan);
2769
0a0aba42 2770 l2cap_send_ack(chan);
6be36555
AE		 2771
2772 l2cap_chan_unlock(chan);
09bfb2ee
SJ		 2773
2774 l2cap_chan_put(chan);
c1b4f43b
GP		 2775}
2776
3c588192 2777static inline int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 2778{
3c588192
MM		 2779 int err;
2780
105bdf9e
MM		 2781 chan->next_tx_seq = 0;
2782 chan->expected_tx_seq = 0;
42e5c802 2783 chan->expected_ack_seq = 0;
6a026610 2784 chan->unacked_frames = 0;
42e5c802 2785 chan->buffer_seq = 0;
6a026610 2786 chan->frames_sent = 0;
105bdf9e
MM		 2787 chan->last_acked_seq = 0;
2788 chan->sdu = NULL;
2789 chan->sdu_last_frag = NULL;
2790 chan->sdu_len = 0;
2791
d34c34fb
MM		 2792 skb_queue_head_init(&chan->tx_q);
2793
105bdf9e
MM		 2794 if (chan->mode != L2CAP_MODE_ERTM)
2795 return 0;
2796
2797 chan->rx_state = L2CAP_RX_STATE_RECV;
2798 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 2799
721c4181
GP		 2800 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2801 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2802 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 2803
f1c6775b 2804 skb_queue_head_init(&chan->srej_q);
1890d36b 2805
3c588192
MM		 2806 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
2807 if (err < 0)
2808 return err;
2809
9dc9affc
MM		 2810 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
2811 if (err < 0)
2812 l2cap_seq_list_free(&chan->srej_list);
2813
2814 return err;
0565c1c2
GP		 2815}
2816
f2fcfcd6
GP		 2817static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2818{
2819 switch (mode) {
2820 case L2CAP_MODE_STREAMING:
2821 case L2CAP_MODE_ERTM:
2822 if (l2cap_mode_supported(mode, remote_feat_mask))
2823 return mode;
2824 /* fall through */
2825 default:
2826 return L2CAP_MODE_BASIC;
2827 }
2828}
2829
6327eb98
AE		 2830static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2831{
2832 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2833}
2834
f89cef09
AE		 2835static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2836{
2837 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2838}
2839
6327eb98
AE		 2840static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
2841{
2842 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
836be934 2843 __l2cap_ews_supported(chan)) {
6327eb98
AE		 2844 /* use extended control field */
2845 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 2846 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
2847 } else {
6327eb98
AE		 2848 chan->tx_win = min_t(u16, chan->tx_win,
2849 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 2850 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
2851 }
6327eb98
AE		 2852}
2853
710f9b0a 2854static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2855{
1da177e4 2856 struct l2cap_conf_req *req = data;
0c1bc5c6 2857 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 2858 void *ptr = req->data;
c8f79162 2859 u16 size;
1da177e4 2860
49208c9c 2861 BT_DBG("chan %p", chan);
1da177e4 2862
73ffa904 2863 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 2864 goto done;
2865
0c1bc5c6 2866 switch (chan->mode) {
f2fcfcd6
GP		 2867 case L2CAP_MODE_STREAMING:
2868 case L2CAP_MODE_ERTM:
c1360a1c 2869 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 2870 break;
85eb53c6 2871
f89cef09
AE		 2872 if (__l2cap_efs_supported(chan))
2873 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2874
2ba13ed6 2875 /* fall through */
f2fcfcd6 2876 default:
8c1d787b 2877 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 2878 break;
2879 }
2880
2881done:
0c1bc5c6
GP		 2882 if (chan->imtu != L2CAP_DEFAULT_MTU)
2883 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 2884
0c1bc5c6 2885 switch (chan->mode) {
65c7c491 2886 case L2CAP_MODE_BASIC:
8c1d787b
GP		 2887 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2888 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 2889 break;
2890
62547752
GP		 2891 rfc.mode = L2CAP_MODE_BASIC;
2892 rfc.txwin_size = 0;
2893 rfc.max_transmit = 0;
2894 rfc.retrans_timeout = 0;
2895 rfc.monitor_timeout = 0;
2896 rfc.max_pdu_size = 0;
2897
63406504
GP		 2898 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2899 (unsigned long) &rfc);
65c7c491
MH		 2900 break;
2901
2902 case L2CAP_MODE_ERTM:
2903 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 2904 rfc.max_transmit = chan->max_tx;
f2fcfcd6
GP		 2905 rfc.retrans_timeout = 0;
2906 rfc.monitor_timeout = 0;
c8f79162
AE		 2907
2908 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2909 L2CAP_EXT_HDR_SIZE -
2910 L2CAP_SDULEN_SIZE -
2911 L2CAP_FCS_SIZE);
2912 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 2913
6327eb98
AE		 2914 l2cap_txwin_setup(chan);
2915
2916 rfc.txwin_size = min_t(u16, chan->tx_win,
2917 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 2918
63406504
GP		 2919 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2920 (unsigned long) &rfc);
2921
f89cef09
AE		 2922 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2923 l2cap_add_opt_efs(&ptr, chan);
2924
8c1d787b 2925 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2926 break;
2927
47d1ec61 2928 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2929 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2930 chan->fcs = L2CAP_FCS_NONE;
2931 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2932 }
6327eb98
AE		 2933
2934 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2935 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2936 chan->tx_win);
f2fcfcd6
GP		 2937 break;
2938
2939 case L2CAP_MODE_STREAMING:
2940 rfc.mode = L2CAP_MODE_STREAMING;
2941 rfc.txwin_size = 0;
2942 rfc.max_transmit = 0;
2943 rfc.retrans_timeout = 0;
2944 rfc.monitor_timeout = 0;
c8f79162
AE		 2945
2946 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2947 L2CAP_EXT_HDR_SIZE -
2948 L2CAP_SDULEN_SIZE -
2949 L2CAP_FCS_SIZE);
2950 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 2951
63406504
GP		 2952 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2953 (unsigned long) &rfc);
2954
f89cef09
AE		 2955 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2956 l2cap_add_opt_efs(&ptr, chan);
2957
8c1d787b 2958 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2959 break;
2960
47d1ec61 2961 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2962 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2963 chan->fcs = L2CAP_FCS_NONE;
2964 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2965 }
65c7c491
MH		 2966 break;
2967 }
1da177e4 2968
fe4128e0 2969 req->dcid = cpu_to_le16(chan->dcid);
aca3192c 2970 req->flags = cpu_to_le16(0);
1da177e4
LT		 2971
2972 return ptr - data;
2973}
2974
73ffa904 2975static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2976{
5dee9e7c
MH		 2977 struct l2cap_conf_rsp *rsp = data;
2978 void *ptr = rsp->data;
73ffa904
GP		 2979 void *req = chan->conf_req;
2980 int len = chan->conf_len;
5dee9e7c
MH		 2981 int type, hint, olen;
2982 unsigned long val;
6464f35f 2983 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 2984 struct l2cap_conf_efs efs;
2985 u8 remote_efs = 0;
861d6882 2986 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2987 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 2988 u16 size;
1da177e4 2989
73ffa904 2990 BT_DBG("chan %p", chan);
820ae1b8 2991
5dee9e7c
MH		 2992 while (len >= L2CAP_CONF_OPT_SIZE) {
2993 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2994
589d2746 2995 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2996 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2997
2998 switch (type) {
2999 case L2CAP_CONF_MTU:
861d6882 3000 mtu = val;
5dee9e7c
MH		 3001 break;
3002
3003 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3004 chan->flush_to = val;
5dee9e7c
MH		 3005 break;
3006
3007 case L2CAP_CONF_QOS:
3008 break;
3009
6464f35f
MH		 3010 case L2CAP_CONF_RFC:
3011 if (olen == sizeof(rfc))
3012 memcpy(&rfc, (void *) val, olen);
3013 break;
3014
fcc203c3
GP		 3015 case L2CAP_CONF_FCS:
3016 if (val == L2CAP_FCS_NONE)
c1360a1c 3017 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 3018 break;
fcc203c3 3019
42dceae2
AE		 3020 case L2CAP_CONF_EFS:
3021 remote_efs = 1;
3022 if (olen == sizeof(efs))
3023 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3024 break;
3025
6327eb98
AE		 3026 case L2CAP_CONF_EWS:
3027 if (!enable_hs)
3028 return -ECONNREFUSED;
fcc203c3 3029
6327eb98
AE		 3030 set_bit(FLAG_EXT_CTRL, &chan->flags);
3031 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3032 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3033 chan->remote_tx_win = val;
fcc203c3
GP		 3034 break;
3035
5dee9e7c
MH		 3036 default:
3037 if (hint)
3038 break;
3039
3040 result = L2CAP_CONF_UNKNOWN;
3041 *((u8 *) ptr++) = type;
3042 break;
3043 }
3044 }
3045
73ffa904 3046 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3047 goto done;
3048
0c1bc5c6 3049 switch (chan->mode) {
f2fcfcd6
GP		 3050 case L2CAP_MODE_STREAMING:
3051 case L2CAP_MODE_ERTM:
c1360a1c 3052 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3053 chan->mode = l2cap_select_mode(rfc.mode,
8c1d787b 3054 chan->conn->feat_mask);
85eb53c6
GP		 3055 break;
3056 }
3057
42dceae2
AE		 3058 if (remote_efs) {
3059 if (__l2cap_efs_supported(chan))
3060 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3061 else
3062 return -ECONNREFUSED;
3063 }
3064
0c1bc5c6 3065 if (chan->mode != rfc.mode)
f2fcfcd6 3066 return -ECONNREFUSED;
742e519b 3067
f2fcfcd6 3068 break;
f2fcfcd6
GP		 3069 }
3070
3071done:
0c1bc5c6 3072 if (chan->mode != rfc.mode) {
f2fcfcd6 3073 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3074 rfc.mode = chan->mode;
f2fcfcd6 3075
73ffa904 3076 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3077 return -ECONNREFUSED;
3078
3079 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3080 sizeof(rfc), (unsigned long) &rfc);
3081 }
3082
5dee9e7c
MH		 3083 if (result == L2CAP_CONF_SUCCESS) {
3084 /* Configure output options and let the other side know
3085 * which ones we don't like. */
3086
f2fcfcd6
GP		 3087 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3088 result = L2CAP_CONF_UNACCEPT;
3089 else {
0c1bc5c6 3090 chan->omtu = mtu;
c1360a1c 3091 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3092 }
0c1bc5c6 3093 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3094
42dceae2
AE		 3095 if (remote_efs) {
3096 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3097 efs.stype != L2CAP_SERV_NOTRAFIC &&
3098 efs.stype != chan->local_stype) {
3099
3100 result = L2CAP_CONF_UNACCEPT;
3101
3102 if (chan->num_conf_req >= 1)
3103 return -ECONNREFUSED;
3104
3105 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3e6b3b95 3106 sizeof(efs),
42dceae2 3107 (unsigned long) &efs);
0e8b207e 3108 } else {
3e6b3b95 3109 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3110 result = L2CAP_CONF_PENDING;
3111 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3112 }
3113 }
3114
f2fcfcd6
GP		 3115 switch (rfc.mode) {
3116 case L2CAP_MODE_BASIC:
47d1ec61 3117 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3118 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3119 break;
3120
3121 case L2CAP_MODE_ERTM:
6327eb98
AE		 3122 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3123 chan->remote_tx_win = rfc.txwin_size;
3124 else
3125 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3126
2c03a7a4 3127 chan->remote_max_tx = rfc.max_transmit;
1c762159 3128
c8f79162
AE		 3129 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3130 chan->conn->mtu -
3131 L2CAP_EXT_HDR_SIZE -
3132 L2CAP_SDULEN_SIZE -
3133 L2CAP_FCS_SIZE);
3134 rfc.max_pdu_size = cpu_to_le16(size);
3135 chan->remote_mps = size;
f2fcfcd6 3136
10467e9e 3137 rfc.retrans_timeout =
4fd21a88 3138 __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
10467e9e 3139 rfc.monitor_timeout =
4fd21a88 3140 __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6 3141
c1360a1c 3142 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3143
3144 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3145 sizeof(rfc), (unsigned long) &rfc);
3146
42dceae2
AE		 3147 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3148 chan->remote_id = efs.id;
3149 chan->remote_stype = efs.stype;
3150 chan->remote_msdu = le16_to_cpu(efs.msdu);
3151 chan->remote_flush_to =
3152 le32_to_cpu(efs.flush_to);
3153 chan->remote_acc_lat =
3154 le32_to_cpu(efs.acc_lat);
3155 chan->remote_sdu_itime =
3156 le32_to_cpu(efs.sdu_itime);
3157 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3158 sizeof(efs), (unsigned long) &efs);
3159 }
f2fcfcd6
GP		 3160 break;
3161
3162 case L2CAP_MODE_STREAMING:
c8f79162
AE		 3163 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3164 chan->conn->mtu -
3165 L2CAP_EXT_HDR_SIZE -
3166 L2CAP_SDULEN_SIZE -
3167 L2CAP_FCS_SIZE);
3168 rfc.max_pdu_size = cpu_to_le16(size);
3169 chan->remote_mps = size;
f2fcfcd6 3170
c1360a1c 3171 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3172
3173 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3174 sizeof(rfc), (unsigned long) &rfc);
3175
f2fcfcd6
GP		 3176 break;
3177
3178 default:
5dee9e7c 3179 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3180
6464f35f 3181 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3182 rfc.mode = chan->mode;
f2fcfcd6 3183 }
6464f35f 3184
f2fcfcd6 3185 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3186 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3187 }
fe4128e0 3188 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c
MH		 3189 rsp->result = cpu_to_le16(result);
3190 rsp->flags = cpu_to_le16(0x0000);
3191
3192 return ptr - data;
1da177e4
LT		 3193}
3194
b4450035 3195static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
f2fcfcd6 3196{
f2fcfcd6
GP		 3197 struct l2cap_conf_req *req = data;
3198 void *ptr = req->data;
3199 int type, olen;
3200 unsigned long val;
36e999a8 3201 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3202 struct l2cap_conf_efs efs;
f2fcfcd6 3203
fe4128e0 3204 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3205
3206 while (len >= L2CAP_CONF_OPT_SIZE) {
3207 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3208
3209 switch (type) {
3210 case L2CAP_CONF_MTU:
3211 if (val < L2CAP_DEFAULT_MIN_MTU) {
3212 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3213 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3214 } else
0c1bc5c6
GP		 3215 chan->imtu = val;
3216 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3217 break;
3218
3219 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3220 chan->flush_to = val;
f2fcfcd6 3221 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
0c1bc5c6 3222 2, chan->flush_to);
f2fcfcd6
GP		 3223 break;
3224
3225 case L2CAP_CONF_RFC:
3226 if (olen == sizeof(rfc))
3227 memcpy(&rfc, (void *)val, olen);
3228
c1360a1c 3229 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
0c1bc5c6 3230 rfc.mode != chan->mode)
f2fcfcd6
GP		 3231 return -ECONNREFUSED;
3232
47d1ec61 3233 chan->fcs = 0;
f2fcfcd6
GP		 3234
3235 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3236 sizeof(rfc), (unsigned long) &rfc);
3237 break;
6327eb98
AE		 3238
3239 case L2CAP_CONF_EWS:
3240 chan->tx_win = min_t(u16, val,
3241 L2CAP_DEFAULT_EXT_WINDOW);
3e6b3b95
GP		 3242 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3243 chan->tx_win);
6327eb98 3244 break;
66af7aaf
AE		 3245
3246 case L2CAP_CONF_EFS:
3247 if (olen == sizeof(efs))
3248 memcpy(&efs, (void *)val, olen);
3249
3250 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3251 efs.stype != L2CAP_SERV_NOTRAFIC &&
3252 efs.stype != chan->local_stype)
3253 return -ECONNREFUSED;
3254
3255 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3256 sizeof(efs), (unsigned long) &efs);
3257 break;
f2fcfcd6
GP		 3258 }
3259 }
3260
0c1bc5c6 3261 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3262 return -ECONNREFUSED;
3263
0c1bc5c6 3264 chan->mode = rfc.mode;
6c2ea7a8 3265
0e8b207e 3266 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3267 switch (rfc.mode) {
3268 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3269 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3270 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3271 chan->mps = le16_to_cpu(rfc.max_pdu_size);
66af7aaf
AE		 3272
3273 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3274 chan->local_msdu = le16_to_cpu(efs.msdu);
3275 chan->local_sdu_itime =
3276 le32_to_cpu(efs.sdu_itime);
3277 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3278 chan->local_flush_to =
3279 le32_to_cpu(efs.flush_to);
3280 }
f2fcfcd6 3281 break;
66af7aaf 3282
f2fcfcd6 3283 case L2CAP_MODE_STREAMING:
47d1ec61 3284 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3285 }
3286 }
3287
fe4128e0 3288 req->dcid = cpu_to_le16(chan->dcid);
f2fcfcd6
GP		 3289 req->flags = cpu_to_le16(0x0000);
3290
3291 return ptr - data;
3292}
3293
fe4128e0 3294static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1da177e4
LT		 3295{
3296 struct l2cap_conf_rsp *rsp = data;
3297 void *ptr = rsp->data;
1da177e4 3298
fe4128e0 3299 BT_DBG("chan %p", chan);
1da177e4 3300
fe4128e0 3301 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3302 rsp->result = cpu_to_le16(result);
aca3192c 3303 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3304
3305 return ptr - data;
3306}
3307
8c1d787b 3308void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3309{
3310 struct l2cap_conn_rsp rsp;
8c1d787b 3311 struct l2cap_conn *conn = chan->conn;
710f9b0a
GP		 3312 u8 buf[128];
3313
fe4128e0
GP		 3314 rsp.scid = cpu_to_le16(chan->dcid);
3315 rsp.dcid = cpu_to_le16(chan->scid);
710f9b0a
GP		 3316 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3317 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
3318 l2cap_send_cmd(conn, chan->ident,
3319 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
3320
c1360a1c 3321 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3322 return;
3323
710f9b0a
GP		 3324 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3325 l2cap_build_conf_req(chan, buf), buf);
3326 chan->num_conf_req++;
3327}
3328
47d1ec61 3329static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3330{
7b1c0049
GP		 3331 int type, olen;
3332 unsigned long val;
3333 struct l2cap_conf_rfc rfc;
3334
47d1ec61 3335 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3336
0c1bc5c6 3337 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3338 return;
3339
3340 while (len >= L2CAP_CONF_OPT_SIZE) {
3341 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3342
3343 switch (type) {
3344 case L2CAP_CONF_RFC:
3345 if (olen == sizeof(rfc))
3346 memcpy(&rfc, (void *)val, olen);
3347 goto done;
3348 }
3349 }
3350
36e999a8
MM		 3351 /* Use sane default values in case a misbehaving remote device
3352 * did not send an RFC option.
3353 */
3354 rfc.mode = chan->mode;
3355 rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3356 rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3357 rfc.max_pdu_size = cpu_to_le16(chan->imtu);
3358
3359 BT_ERR("Expected RFC option was not found, using defaults");
3360
7b1c0049
GP		 3361done:
3362 switch (rfc.mode) {
3363 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3364 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3365 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3366 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3367 break;
3368 case L2CAP_MODE_STREAMING:
47d1ec61 3369 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3370 }
3371}
3372
4e8402a3
MH		 3373static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3374{
e2fd318e 3375 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3376
e2fd318e 3377 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3378 return 0;
3379
3380 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
3381 cmd->ident == conn->info_ident) {
17cd3f37 3382 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3383
3384 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3385 conn->info_ident = 0;
984947dc 3386
4e8402a3
MH		 3387 l2cap_conn_start(conn);
3388 }
3389
3390 return 0;
3391}
3392
1da177e4
LT		 3393static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3394{
1da177e4
LT		 3395 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3396 struct l2cap_conn_rsp rsp;
23691d75 3397 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3398 struct sock *parent, *sk = NULL;
e7c29cb1 3399 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3400
3401 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3402 __le16 psm = req->psm;
1da177e4 3403
097db76c 3404 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3405
3406 /* Check if we have socket listening on psm */
c2287681 3407 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 3408 if (!pchan) {
1da177e4
LT		 3409 result = L2CAP_CR_BAD_PSM;
3410 goto sendresp;
3411 }
3412
23691d75
GP		 3413 parent = pchan->sk;
3414
3df91ea2 3415 mutex_lock(&conn->chan_lock);
aa2ac881 3416 lock_sock(parent);
e0f0cb56 3417
e7c29cb1
MH		 3418 /* Check if the ACL is secure enough (if not SDP) */
3419 if (psm != cpu_to_le16(0x0001) &&
3420 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3421 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3422 result = L2CAP_CR_SEC_BLOCK;
3423 goto response;
3424 }
3425
1da177e4
LT		 3426 result = L2CAP_CR_NO_MEM;
3427
3428 /* Check for backlog size */
3429 if (sk_acceptq_is_full(parent)) {
8e87d142 3430 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 3431 goto response;
3432 }
3433
80808e43
GP		 3434 chan = pchan->ops->new_connection(pchan->data);
3435 if (!chan)
1da177e4
LT		 3436 goto response;
3437
80808e43
GP		 3438 sk = chan->sk;
3439
1da177e4 3440 /* Check if we already have channel with that dcid */
baa7e1fa 3441 if (__l2cap_get_chan_by_dcid(conn, scid)) {
1da177e4 3442 sock_set_flag(sk, SOCK_ZAPPED);
ba3bd0ee 3443 chan->ops->close(chan->data);
1da177e4
LT		 3444 goto response;
3445 }
3446
3447 hci_conn_hold(conn->hcon);
3448
1da177e4
LT		 3449 bacpy(&bt_sk(sk)->src, conn->src);
3450 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3451 chan->psm = psm;
3452 chan->dcid = scid;
1da177e4 3453
d1010240
GP		 3454 bt_accept_enqueue(parent, sk);
3455
6be36555 3456 __l2cap_chan_add(conn, chan);
48454079 3457
fe4128e0 3458 dcid = chan->scid;
1da177e4 3459
c9b66675 3460 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3461
fc7f8a7e 3462 chan->ident = cmd->ident;
1da177e4 3463
984947dc 3464 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3465 if (l2cap_chan_check_security(chan)) {
c5daa683 3466 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
0e587be7 3467 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3468 result = L2CAP_CR_PEND;
3469 status = L2CAP_CS_AUTHOR_PEND;
3470 parent->sk_data_ready(parent, 0);
3471 } else {
0e587be7 3472 __l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 3473 result = L2CAP_CR_SUCCESS;
3474 status = L2CAP_CS_NO_INFO;
3475 }
79d554a6 3476 } else {
0e587be7 3477 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3478 result = L2CAP_CR_PEND;
3479 status = L2CAP_CS_AUTHEN_PEND;
3480 }
3481 } else {
0e587be7 3482 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3483 result = L2CAP_CR_PEND;
3484 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3485 }
3486
1da177e4 3487response:
aa2ac881 3488 release_sock(parent);
3df91ea2 3489 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3490
3491sendresp:
aca3192c
YH		 3492 rsp.scid = cpu_to_le16(scid);
3493 rsp.dcid = cpu_to_le16(dcid);
3494 rsp.result = cpu_to_le16(result);
3495 rsp.status = cpu_to_le16(status);
1da177e4 3496 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 3497
3498 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3499 struct l2cap_info_req info;
3500 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3501
3502 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3503 conn->info_ident = l2cap_get_ident(conn);
3504
ba13ccd9 3505 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6
MH		 3506
3507 l2cap_send_cmd(conn, conn->info_ident,
3508 L2CAP_INFO_REQ, sizeof(info), &info);
3509 }
3510
c1360a1c 3511 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
e9aeb2dd
GP		 3512 result == L2CAP_CR_SUCCESS) {
3513 u8 buf[128];
c1360a1c 3514 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3515 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3516 l2cap_build_conf_req(chan, buf), buf);
3517 chan->num_conf_req++;
e9aeb2dd
GP		 3518 }
3519
1da177e4
LT		 3520 return 0;
3521}
3522
3523static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3524{
3525 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3526 u16 scid, dcid, result, status;
48454079 3527 struct l2cap_chan *chan;
1da177e4 3528 u8 req[128];
3df91ea2 3529 int err;
1da177e4
LT		 3530
3531 scid = __le16_to_cpu(rsp->scid);
3532 dcid = __le16_to_cpu(rsp->dcid);
3533 result = __le16_to_cpu(rsp->result);
3534 status = __le16_to_cpu(rsp->status);
3535
1b009c98
AE		 3536 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3537 dcid, scid, result, status);
1da177e4 3538
3df91ea2
AE		 3539 mutex_lock(&conn->chan_lock);
3540
1da177e4 3541 if (scid) {
3df91ea2
AE		 3542 chan = __l2cap_get_chan_by_scid(conn, scid);
3543 if (!chan) {
3544 err = -EFAULT;
3545 goto unlock;
3546 }
1da177e4 3547 } else {
3df91ea2
AE		 3548 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3549 if (!chan) {
3550 err = -EFAULT;
3551 goto unlock;
3552 }
1da177e4
LT		 3553 }
3554
3df91ea2
AE		 3555 err = 0;
3556
6be36555 3557 l2cap_chan_lock(chan);
48454079 3558
1da177e4
LT		 3559 switch (result) {
3560 case L2CAP_CR_SUCCESS:
89bc500e 3561 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3562 chan->ident = 0;
fe4128e0 3563 chan->dcid = dcid;
c1360a1c 3564 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3565
c1360a1c 3566 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3567 break;
3568
1da177e4 3569 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3570 l2cap_build_conf_req(chan, req), req);
3571 chan->num_conf_req++;
1da177e4
LT		 3572 break;
3573
3574 case L2CAP_CR_PEND:
c1360a1c 3575 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3576 break;
3577
3578 default:
48454079 3579 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3580 break;
3581 }
3582
6be36555 3583 l2cap_chan_unlock(chan);
3df91ea2
AE		 3584
3585unlock:
3586 mutex_unlock(&conn->chan_lock);
3587
3588 return err;
1da177e4
LT		 3589}
3590
47d1ec61 3591static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3592{
3593 /* FCS is enabled only in ERTM or streaming mode, if one or both
3594 * sides request it.
3595 */
0c1bc5c6 3596 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3597 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3598 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 3599 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3600}
3601
88219a0f 3602static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3603{
3604 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3605 u16 dcid, flags;
3606 u8 rsp[64];
48454079 3607 struct l2cap_chan *chan;
3c588192 3608 int len, err = 0;
1da177e4
LT		 3609
3610 dcid = __le16_to_cpu(req->dcid);
3611 flags = __le16_to_cpu(req->flags);
3612
3613 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3614
baa7e1fa 3615 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3616 if (!chan)
1da177e4
LT		 3617 return -ENOENT;
3618
033b1142 3619 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3620 struct l2cap_cmd_rej_cid rej;
3621
3622 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
3623 rej.scid = cpu_to_le16(chan->scid);
3624 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3625
df6bd743
GP		 3626 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
3627 sizeof(rej), &rej);
354f60a9 3628 goto unlock;
df6bd743 3629 }
354f60a9 3630
5dee9e7c 3631 /* Reject if config buffer is too small. */
88219a0f 3632 len = cmd_len - sizeof(*req);
7ac28817 3633 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3634 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 3635 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c
MH		 3636 L2CAP_CONF_REJECT, flags), rsp);
3637 goto unlock;
3638 }
3639
3640 /* Store config. */
73ffa904
GP		 3641 memcpy(chan->conf_req + chan->conf_len, req->data, len);
3642 chan->conf_len += len;
1da177e4
LT		 3643
3644 if (flags & 0x0001) {
3645 /* Incomplete config. Send empty response. */
3646 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 3647 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c 3648 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 3649 goto unlock;
3650 }
3651
3652 /* Complete config. */
73ffa904 3653 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 3654 if (len < 0) {
e92c8e70 3655 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 3656 goto unlock;
f2fcfcd6 3657 }
1da177e4 3658
5dee9e7c 3659 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 3660 chan->num_conf_rsp++;
5dee9e7c 3661
5dee9e7c 3662 /* Reset config buffer. */
73ffa904 3663 chan->conf_len = 0;
5dee9e7c 3664
c1360a1c 3665 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 3666 goto unlock;
3667
c1360a1c 3668 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 3669 set_default_fcs(chan);
fcc203c3 3670
89bc500e 3671 l2cap_state_change(chan, BT_CONNECTED);
e90bac06 3672
105bdf9e
MM		 3673 if (chan->mode == L2CAP_MODE_ERTM ||
3674 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 3675 err = l2cap_ertm_init(chan);
3676
3677 if (err < 0)
3678 l2cap_send_disconn_req(chan->conn, chan, -err);
3679 else
3680 l2cap_chan_ready(chan);
0565c1c2 3681
876d9484
MH		 3682 goto unlock;
3683 }
3684
c1360a1c 3685 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 3686 u8 buf[64];
1da177e4 3687 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 3688 l2cap_build_conf_req(chan, buf), buf);
3689 chan->num_conf_req++;
1da177e4
LT		 3690 }
3691
0e8b207e
AE		 3692 /* Got Conf Rsp PENDING from remote side and asume we sent
3693 Conf Rsp PENDING in the code above */
3694 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
3695 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3696
3697 /* check compatibility */
3698
3699 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3700 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3701
3702 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 3703 l2cap_build_conf_rsp(chan, rsp,
0e8b207e
AE		 3704 L2CAP_CONF_SUCCESS, 0x0000), rsp);
3705 }
3706
1da177e4 3707unlock:
6be36555 3708 l2cap_chan_unlock(chan);
3c588192 3709 return err;
1da177e4
LT		 3710}
3711
3712static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3713{
3714 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3715 u16 scid, flags, result;
48454079 3716 struct l2cap_chan *chan;
61386cba 3717 int len = le16_to_cpu(cmd->len) - sizeof(*rsp);
3c588192 3718 int err = 0;
1da177e4
LT		 3719
3720 scid = __le16_to_cpu(rsp->scid);
3721 flags = __le16_to_cpu(rsp->flags);
3722 result = __le16_to_cpu(rsp->result);
3723
61386cba
AE		 3724 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
3725 result, len);
1da177e4 3726
baa7e1fa 3727 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3728 if (!chan)
1da177e4
LT		 3729 return 0;
3730
3731 switch (result) {
3732 case L2CAP_CONF_SUCCESS:
47d1ec61 3733 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 3734 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 3735 break;
3736
0e8b207e
AE		 3737 case L2CAP_CONF_PENDING:
3738 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
3739
3740 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3741 char buf[64];
3742
3743 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
3744 buf, &result);
3745 if (len < 0) {
3746 l2cap_send_disconn_req(conn, chan, ECONNRESET);
3747 goto done;
3748 }
3749
3750 /* check compatibility */
3751
3752 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3753 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3754
3755 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 3756 l2cap_build_conf_rsp(chan, buf,
0e8b207e
AE		 3757 L2CAP_CONF_SUCCESS, 0x0000), buf);
3758 }
3759 goto done;
3760
1da177e4 3761 case L2CAP_CONF_UNACCEPT:
73ffa904 3762 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3763 char req[64];
3764
c2c77ec8 3765 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 3766 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 3767 goto done;
3768 }
3769
f2fcfcd6
GP		 3770 /* throw out any old stored conf requests */
3771 result = L2CAP_CONF_SUCCESS;
b4450035
GP		 3772 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
3773 req, &result);
f2fcfcd6 3774 if (len < 0) {
e92c8e70 3775 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 3776 goto done;
3777 }
3778
3779 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3780 L2CAP_CONF_REQ, len, req);
73ffa904 3781 chan->num_conf_req++;
f2fcfcd6
GP		 3782 if (result != L2CAP_CONF_SUCCESS)
3783 goto done;
3784 break;
1da177e4
LT		 3785 }
3786
8e87d142 3787 default:
6be36555 3788 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 3789
ba13ccd9 3790 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
e92c8e70 3791 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 3792 goto done;
3793 }
3794
3795 if (flags & 0x01)
3796 goto done;
3797
c1360a1c 3798 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 3799
c1360a1c 3800 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 3801 set_default_fcs(chan);
fcc203c3 3802
89bc500e 3803 l2cap_state_change(chan, BT_CONNECTED);
105bdf9e
MM		 3804 if (chan->mode == L2CAP_MODE_ERTM ||
3805 chan->mode == L2CAP_MODE_STREAMING)
3c588192 3806 err = l2cap_ertm_init(chan);
0565c1c2 3807
3c588192
MM		 3808 if (err < 0)
3809 l2cap_send_disconn_req(chan->conn, chan, -err);
3810 else
3811 l2cap_chan_ready(chan);
1da177e4
LT		 3812 }
3813
3814done:
6be36555 3815 l2cap_chan_unlock(chan);
3c588192 3816 return err;
1da177e4
LT		 3817}
3818
3819static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3820{
3821 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3822 struct l2cap_disconn_rsp rsp;
3823 u16 dcid, scid;
48454079 3824 struct l2cap_chan *chan;
1da177e4
LT		 3825 struct sock *sk;
3826
3827 scid = __le16_to_cpu(req->scid);
3828 dcid = __le16_to_cpu(req->dcid);
3829
3830 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3831
3df91ea2
AE		 3832 mutex_lock(&conn->chan_lock);
3833
3834 chan = __l2cap_get_chan_by_scid(conn, dcid);
3835 if (!chan) {
3836 mutex_unlock(&conn->chan_lock);
1da177e4 3837 return 0;
3df91ea2 3838 }
1da177e4 3839
6be36555
AE		 3840 l2cap_chan_lock(chan);
3841
48454079
GP		 3842 sk = chan->sk;
3843
fe4128e0
GP		 3844 rsp.dcid = cpu_to_le16(chan->scid);
3845 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 3846 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3847
6be36555 3848 lock_sock(sk);
1da177e4 3849 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 3850 release_sock(sk);
1da177e4 3851
61d6ef3e 3852 l2cap_chan_hold(chan);
48454079 3853 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 3854
3855 l2cap_chan_unlock(chan);
1da177e4 3856
ba3bd0ee 3857 chan->ops->close(chan->data);
61d6ef3e 3858 l2cap_chan_put(chan);
3df91ea2
AE		 3859
3860 mutex_unlock(&conn->chan_lock);
3861
1da177e4
LT		 3862 return 0;
3863}
3864
3865static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3866{
3867 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3868 u16 dcid, scid;
48454079 3869 struct l2cap_chan *chan;
1da177e4
LT		 3870
3871 scid = __le16_to_cpu(rsp->scid);
3872 dcid = __le16_to_cpu(rsp->dcid);
3873
3874 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3875
3df91ea2
AE		 3876 mutex_lock(&conn->chan_lock);
3877
3878 chan = __l2cap_get_chan_by_scid(conn, scid);
3879 if (!chan) {
3880 mutex_unlock(&conn->chan_lock);
1da177e4 3881 return 0;
3df91ea2 3882 }
1da177e4 3883
6be36555 3884 l2cap_chan_lock(chan);
48454079 3885
61d6ef3e 3886 l2cap_chan_hold(chan);
48454079 3887 l2cap_chan_del(chan, 0);
6be36555
AE		 3888
3889 l2cap_chan_unlock(chan);
1da177e4 3890
ba3bd0ee 3891 chan->ops->close(chan->data);
61d6ef3e 3892 l2cap_chan_put(chan);
3df91ea2
AE		 3893
3894 mutex_unlock(&conn->chan_lock);
3895
1da177e4
LT		 3896 return 0;
3897}
3898
3899static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3900{
3901 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3902 u16 type;
3903
3904 type = __le16_to_cpu(req->type);
3905
3906 BT_DBG("type 0x%4.4x", type);
3907
f0709e03
MH		 3908 if (type == L2CAP_IT_FEAT_MASK) {
3909 u8 buf[8];
44dd46de 3910 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3911 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3912 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3913 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3914 if (!disable_ertm)
fcc203c3
GP		 3915 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3916 | L2CAP_FEAT_FCS;
a5fd6f30 3917 if (enable_hs)
6327eb98
AE		 3918 feat_mask |= L2CAP_FEAT_EXT_FLOW
3919 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 3920
1b7bf4ed 3921 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3922 l2cap_send_cmd(conn, cmd->ident,
3923 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3924 } else if (type == L2CAP_IT_FIXED_CHAN) {
3925 u8 buf[12];
3926 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 3927
3928 if (enable_hs)
3929 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
3930 else
3931 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
3932
e1027a7c
MH		 3933 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3934 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 3935 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
e1027a7c
MH		 3936 l2cap_send_cmd(conn, cmd->ident,
3937 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3938 } else {
3939 struct l2cap_info_rsp rsp;
3940 rsp.type = cpu_to_le16(type);
3941 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3942 l2cap_send_cmd(conn, cmd->ident,
3943 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3944 }
1da177e4
LT		 3945
3946 return 0;
3947}
3948
3949static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3950{
3951 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3952 u16 type, result;
3953
3954 type = __le16_to_cpu(rsp->type);
3955 result = __le16_to_cpu(rsp->result);
3956
3957 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3958
e90165be
AE		 3959 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
3960 if (cmd->ident != conn->info_ident ||
3961 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
3962 return 0;
3963
17cd3f37 3964 cancel_delayed_work(&conn->info_timer);
4e8402a3 3965
adb08ede
VT		 3966 if (result != L2CAP_IR_SUCCESS) {
3967 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3968 conn->info_ident = 0;
3969
3970 l2cap_conn_start(conn);
3971
3972 return 0;
3973 }
3974
978c93b9
AE		 3975 switch (type) {
3976 case L2CAP_IT_FEAT_MASK:
83985319 3977 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3978
47ec1dcd 3979 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3980 struct l2cap_info_req req;
3981 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3982
3983 conn->info_ident = l2cap_get_ident(conn);
3984
3985 l2cap_send_cmd(conn, conn->info_ident,
3986 L2CAP_INFO_REQ, sizeof(req), &req);
3987 } else {
3988 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3989 conn->info_ident = 0;
3990
3991 l2cap_conn_start(conn);
3992 }
978c93b9
AE		 3993 break;
3994
3995 case L2CAP_IT_FIXED_CHAN:
3996 conn->fixed_chan_mask = rsp->data[0];
984947dc 3997 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3998 conn->info_ident = 0;
984947dc
MH		 3999
4000 l2cap_conn_start(conn);
978c93b9 4001 break;
984947dc 4002 }
4e8402a3 4003
1da177e4
LT		 4004 return 0;
4005}
4006
f94ff6ff
MM		 4007static inline int l2cap_create_channel_req(struct l2cap_conn *conn,
4008 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4009 void *data)
4010{
4011 struct l2cap_create_chan_req *req = data;
4012 struct l2cap_create_chan_rsp rsp;
4013 u16 psm, scid;
4014
4015 if (cmd_len != sizeof(*req))
4016 return -EPROTO;
4017
4018 if (!enable_hs)
4019 return -EINVAL;
4020
4021 psm = le16_to_cpu(req->psm);
4022 scid = le16_to_cpu(req->scid);
4023
4024 BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id);
4025
4026 /* Placeholder: Always reject */
4027 rsp.dcid = 0;
4028 rsp.scid = cpu_to_le16(scid);
8ce0c498
AE		 4029 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4030 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f94ff6ff
MM		 4031
4032 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4033 sizeof(rsp), &rsp);
4034
4035 return 0;
4036}
4037
4038static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn,
4039 struct l2cap_cmd_hdr *cmd, void *data)
4040{
4041 BT_DBG("conn %p", conn);
4042
4043 return l2cap_connect_rsp(conn, cmd, data);
4044}
4045
8d5a04a1
MM		 4046static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
4047 u16 icid, u16 result)
4048{
4049 struct l2cap_move_chan_rsp rsp;
4050
4051 BT_DBG("icid %d, result %d", icid, result);
4052
4053 rsp.icid = cpu_to_le16(icid);
4054 rsp.result = cpu_to_le16(result);
4055
4056 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
4057}
4058
4059static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn,
4060 struct l2cap_chan *chan, u16 icid, u16 result)
4061{
4062 struct l2cap_move_chan_cfm cfm;
4063 u8 ident;
4064
4065 BT_DBG("icid %d, result %d", icid, result);
4066
4067 ident = l2cap_get_ident(conn);
4068 if (chan)
4069 chan->ident = ident;
4070
4071 cfm.icid = cpu_to_le16(icid);
4072 cfm.result = cpu_to_le16(result);
4073
4074 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm);
4075}
4076
4077static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
4078 u16 icid)
4079{
4080 struct l2cap_move_chan_cfm_rsp rsp;
4081
4082 BT_DBG("icid %d", icid);
4083
4084 rsp.icid = cpu_to_le16(icid);
4085 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4086}
4087
4088static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
4089 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
4090{
4091 struct l2cap_move_chan_req *req = data;
4092 u16 icid = 0;
4093 u16 result = L2CAP_MR_NOT_ALLOWED;
4094
4095 if (cmd_len != sizeof(*req))
4096 return -EPROTO;
4097
4098 icid = le16_to_cpu(req->icid);
4099
4100 BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id);
4101
4102 if (!enable_hs)
4103 return -EINVAL;
4104
4105 /* Placeholder: Always refuse */
4106 l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
4107
4108 return 0;
4109}
4110
4111static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
4112 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
4113{
4114 struct l2cap_move_chan_rsp *rsp = data;
4115 u16 icid, result;
4116
4117 if (cmd_len != sizeof(*rsp))
4118 return -EPROTO;
4119
4120 icid = le16_to_cpu(rsp->icid);
4121 result = le16_to_cpu(rsp->result);
4122
4123 BT_DBG("icid %d, result %d", icid, result);
4124
4125 /* Placeholder: Always unconfirmed */
4126 l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED);
4127
4128 return 0;
4129}
4130
4131static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
4132 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
4133{
4134 struct l2cap_move_chan_cfm *cfm = data;
4135 u16 icid, result;
4136
4137 if (cmd_len != sizeof(*cfm))
4138 return -EPROTO;
4139
4140 icid = le16_to_cpu(cfm->icid);
4141 result = le16_to_cpu(cfm->result);
4142
4143 BT_DBG("icid %d, result %d", icid, result);
4144
4145 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4146
4147 return 0;
4148}
4149
4150static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
4151 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
4152{
4153 struct l2cap_move_chan_cfm_rsp *rsp = data;
4154 u16 icid;
4155
4156 if (cmd_len != sizeof(*rsp))
4157 return -EPROTO;
4158
4159 icid = le16_to_cpu(rsp->icid);
4160
4161 BT_DBG("icid %d", icid);
4162
4163 return 0;
4164}
4165
e2174ca4 4166static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
de73115a
CT		 4167 u16 to_multiplier)
4168{
4169 u16 max_latency;
4170
4171 if (min > max || min < 6 || max > 3200)
4172 return -EINVAL;
4173
4174 if (to_multiplier < 10 || to_multiplier > 3200)
4175 return -EINVAL;
4176
4177 if (max >= to_multiplier * 8)
4178 return -EINVAL;
4179
4180 max_latency = (to_multiplier * 8 / max) - 1;
4181 if (latency > 499 || latency > max_latency)
4182 return -EINVAL;
4183
4184 return 0;
4185}
4186
4187static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
4188 struct l2cap_cmd_hdr *cmd, u8 *data)
4189{
4190 struct hci_conn *hcon = conn->hcon;
4191 struct l2cap_conn_param_update_req *req;
4192 struct l2cap_conn_param_update_rsp rsp;
4193 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 4194 int err;
de73115a
CT		 4195
4196 if (!(hcon->link_mode & HCI_LM_MASTER))
4197 return -EINVAL;
4198
4199 cmd_len = __le16_to_cpu(cmd->len);
4200 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
4201 return -EPROTO;
4202
4203 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 4204 min = __le16_to_cpu(req->min);
4205 max = __le16_to_cpu(req->max);
de73115a
CT		 4206 latency = __le16_to_cpu(req->latency);
4207 to_multiplier = __le16_to_cpu(req->to_multiplier);
4208
4209 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
4210 min, max, latency, to_multiplier);
4211
4212 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 4213
4214 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
4215 if (err)
de73115a
CT		 4216 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
4217 else
4218 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
4219
4220 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
4221 sizeof(rsp), &rsp);
4222
2ce603eb
CT		 4223 if (!err)
4224 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
4225
de73115a
CT		 4226 return 0;
4227}
4228
3300d9a9
CT		 4229static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
4230 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4231{
4232 int err = 0;
4233
4234 switch (cmd->code) {
4235 case L2CAP_COMMAND_REJ:
4236 l2cap_command_rej(conn, cmd, data);
4237 break;
4238
4239 case L2CAP_CONN_REQ:
4240 err = l2cap_connect_req(conn, cmd, data);
4241 break;
4242
4243 case L2CAP_CONN_RSP:
4244 err = l2cap_connect_rsp(conn, cmd, data);
4245 break;
4246
4247 case L2CAP_CONF_REQ:
4248 err = l2cap_config_req(conn, cmd, cmd_len, data);
4249 break;
4250
4251 case L2CAP_CONF_RSP:
4252 err = l2cap_config_rsp(conn, cmd, data);
4253 break;
4254
4255 case L2CAP_DISCONN_REQ:
4256 err = l2cap_disconnect_req(conn, cmd, data);
4257 break;
4258
4259 case L2CAP_DISCONN_RSP:
4260 err = l2cap_disconnect_rsp(conn, cmd, data);
4261 break;
4262
4263 case L2CAP_ECHO_REQ:
4264 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
4265 break;
4266
4267 case L2CAP_ECHO_RSP:
4268 break;
4269
4270 case L2CAP_INFO_REQ:
4271 err = l2cap_information_req(conn, cmd, data);
4272 break;
4273
4274 case L2CAP_INFO_RSP:
4275 err = l2cap_information_rsp(conn, cmd, data);
4276 break;
4277
f94ff6ff
MM		 4278 case L2CAP_CREATE_CHAN_REQ:
4279 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
4280 break;
4281
4282 case L2CAP_CREATE_CHAN_RSP:
4283 err = l2cap_create_channel_rsp(conn, cmd, data);
4284 break;
4285
8d5a04a1
MM		 4286 case L2CAP_MOVE_CHAN_REQ:
4287 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
4288 break;
4289
4290 case L2CAP_MOVE_CHAN_RSP:
4291 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
4292 break;
4293
4294 case L2CAP_MOVE_CHAN_CFM:
4295 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
4296 break;
4297
4298 case L2CAP_MOVE_CHAN_CFM_RSP:
4299 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
4300 break;
4301
3300d9a9
CT		 4302 default:
4303 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
4304 err = -EINVAL;
4305 break;
4306 }
4307
4308 return err;
4309}
4310
4311static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
4312 struct l2cap_cmd_hdr *cmd, u8 *data)
4313{
4314 switch (cmd->code) {
4315 case L2CAP_COMMAND_REJ:
4316 return 0;
4317
4318 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 4319 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 4320
4321 case L2CAP_CONN_PARAM_UPDATE_RSP:
4322 return 0;
4323
4324 default:
4325 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
4326 return -EINVAL;
4327 }
4328}
4329
4330static inline void l2cap_sig_channel(struct l2cap_conn *conn,
4331 struct sk_buff *skb)
1da177e4
LT		 4332{
4333 u8 *data = skb->data;
4334 int len = skb->len;
4335 struct l2cap_cmd_hdr cmd;
3300d9a9 4336 int err;
1da177e4
LT		 4337
4338 l2cap_raw_recv(conn, skb);
4339
4340 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 4341 u16 cmd_len;
1da177e4
LT		 4342 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
4343 data += L2CAP_CMD_HDR_SIZE;
4344 len -= L2CAP_CMD_HDR_SIZE;
4345
88219a0f 4346 cmd_len = le16_to_cpu(cmd.len);
1da177e4 4347
88219a0f 4348 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 4349
88219a0f 4350 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 4351 BT_DBG("corrupted command");
4352 break;
4353 }
4354
3300d9a9
CT		 4355 if (conn->hcon->type == LE_LINK)
4356 err = l2cap_le_sig_cmd(conn, &cmd, data);
4357 else
4358 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 4359
4360 if (err) {
e2fd318e 4361 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 4362
4363 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 4364
4365 /* FIXME: Map err to a valid reason */
e2fd318e 4366 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
1da177e4
LT		 4367 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4368 }
4369
88219a0f
AV		 4370 data += cmd_len;
4371 len -= cmd_len;
1da177e4
LT		 4372 }
4373
4374 kfree_skb(skb);
4375}
4376
47d1ec61 4377static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 4378{
4379 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 4380 int hdr_size;
4381
4382 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
4383 hdr_size = L2CAP_EXT_HDR_SIZE;
4384 else
4385 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 4386
47d1ec61 4387 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 4388 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 4389 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
4390 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
4391
4392 if (our_fcs != rcv_fcs)
7a560e5c 4393 return -EBADMSG;
fcc203c3
GP		 4394 }
4395 return 0;
4396}
4397
525cd185 4398static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 4399{
e31f7633 4400 struct l2cap_ctrl control;
d5392c8f 4401
e31f7633 4402 BT_DBG("chan %p", chan);
d5392c8f 4403
e31f7633
MM		 4404 memset(&control, 0, sizeof(control));
4405 control.sframe = 1;
4406 control.final = 1;
4407 control.reqseq = chan->buffer_seq;
4408 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 4409
e2ab4353 4410 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 4411 control.super = L2CAP_SUPER_RNR;
4412 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 4413 }
4414
e31f7633
MM		 4415 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
4416 chan->unacked_frames > 0)
4417 __set_retrans_timer(chan);
d5392c8f 4418
e31f7633 4419 /* Send pending iframes */
525cd185 4420 l2cap_ertm_send(chan);
d5392c8f 4421
e2ab4353 4422 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 4423 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
4424 /* F-bit wasn't sent in an s-frame or i-frame yet, so
4425 * send it now.
4426 */
4427 control.super = L2CAP_SUPER_RR;
4428 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 4429 }
4430}
4431
84084a31
MM		 4432static void append_skb_frag(struct sk_buff *skb,
4433 struct sk_buff *new_frag, struct sk_buff **last_frag)
18778a63 4434{
84084a31
MM		 4435 /* skb->len reflects data in skb as well as all fragments
4436 * skb->data_len reflects only data in fragments
4437 */
4438 if (!skb_has_frag_list(skb))
4439 skb_shinfo(skb)->frag_list = new_frag;
4440
4441 new_frag->next = NULL;
4442
4443 (*last_frag)->next = new_frag;
4444 *last_frag = new_frag;
4445
4446 skb->len += new_frag->len;
4447 skb->data_len += new_frag->len;
4448 skb->truesize += new_frag->truesize;
4449}
4450
4b51dae9
MM		 4451static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
4452 struct l2cap_ctrl *control)
84084a31
MM		 4453{
4454 int err = -EINVAL;
18778a63 4455
4b51dae9 4456 switch (control->sar) {
7e0ef6ee 4457 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 4458 if (chan->sdu)
4459 break;
18778a63 4460
84084a31
MM		 4461 err = chan->ops->recv(chan->data, skb);
4462 break;
18778a63 4463
7e0ef6ee 4464 case L2CAP_SAR_START:
84084a31
MM		 4465 if (chan->sdu)
4466 break;
18778a63 4467
6f61fd47 4468 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 4469 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 4470
84084a31
MM		 4471 if (chan->sdu_len > chan->imtu) {
4472 err = -EMSGSIZE;
4473 break;
4474 }
1890d36b 4475
84084a31
MM		 4476 if (skb->len >= chan->sdu_len)
4477 break;
18778a63 4478
84084a31
MM		 4479 chan->sdu = skb;
4480 chan->sdu_last_frag = skb;
18778a63 4481
84084a31
MM		 4482 skb = NULL;
4483 err = 0;
18778a63
GP		 4484 break;
4485
7e0ef6ee 4486 case L2CAP_SAR_CONTINUE:
6f61fd47 4487 if (!chan->sdu)
84084a31 4488 break;
18778a63 4489
84084a31
MM		 4490 append_skb_frag(chan->sdu, skb,
4491 &chan->sdu_last_frag);
4492 skb = NULL;
18778a63 4493
84084a31
MM		 4494 if (chan->sdu->len >= chan->sdu_len)
4495 break;
4178ba46 4496
84084a31 4497 err = 0;
18778a63
GP		 4498 break;
4499
7e0ef6ee 4500 case L2CAP_SAR_END:
6f61fd47 4501 if (!chan->sdu)
84084a31 4502 break;
18778a63 4503
84084a31
MM		 4504 append_skb_frag(chan->sdu, skb,
4505 &chan->sdu_last_frag);
4506 skb = NULL;
4178ba46 4507
84084a31
MM		 4508 if (chan->sdu->len != chan->sdu_len)
4509 break;
18778a63 4510
84084a31 4511 err = chan->ops->recv(chan->data, chan->sdu);
1890d36b 4512
84084a31
MM		 4513 if (!err) {
4514 /* Reassembly complete */
4515 chan->sdu = NULL;
4516 chan->sdu_last_frag = NULL;
4517 chan->sdu_len = 0;
1890d36b 4518 }
18778a63
GP		 4519 break;
4520 }
4521
84084a31
MM		 4522 if (err) {
4523 kfree_skb(skb);
4524 kfree_skb(chan->sdu);
4525 chan->sdu = NULL;
4526 chan->sdu_last_frag = NULL;
4527 chan->sdu_len = 0;
4528 }
18778a63 4529
84084a31 4530 return err;
18778a63
GP		 4531}
4532
61aa4f5b 4533void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 4534{
61aa4f5b 4535 u8 event;
712132eb 4536
61aa4f5b
MM		 4537 if (chan->mode != L2CAP_MODE_ERTM)
4538 return;
712132eb 4539
61aa4f5b
MM		 4540 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
4541 l2cap_tx(chan, 0, 0, event);
1890d36b
GP		 4542}
4543
d2a7ac5d
MM		 4544static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
4545{
63838725
MM		 4546 int err = 0;
4547 /* Pass sequential frames to l2cap_reassemble_sdu()
4548 * until a gap is encountered.
4549 */
4550
4551 BT_DBG("chan %p", chan);
4552
4553 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4554 struct sk_buff *skb;
4555 BT_DBG("Searching for skb with txseq %d (queue len %d)",
4556 chan->buffer_seq, skb_queue_len(&chan->srej_q));
4557
4558 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
4559
4560 if (!skb)
4561 break;
4562
4563 skb_unlink(skb, &chan->srej_q);
4564 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
4565 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
4566 if (err)
4567 break;
4568 }
4569
4570 if (skb_queue_empty(&chan->srej_q)) {
4571 chan->rx_state = L2CAP_RX_STATE_RECV;
4572 l2cap_send_ack(chan);
4573 }
4574
4575 return err;
d2a7ac5d
MM		 4576}
4577
4578static void l2cap_handle_srej(struct l2cap_chan *chan,
4579 struct l2cap_ctrl *control)
4580{
f80842a8
MM		 4581 struct sk_buff *skb;
4582
4583 BT_DBG("chan %p, control %p", chan, control);
4584
4585 if (control->reqseq == chan->next_tx_seq) {
4586 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
4587 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4588 return;
4589 }
4590
4591 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
4592
4593 if (skb == NULL) {
4594 BT_DBG("Seq %d not available for retransmission",
4595 control->reqseq);
4596 return;
4597 }
4598
4599 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
4600 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
4601 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4602 return;
4603 }
4604
4605 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4606
4607 if (control->poll) {
4608 l2cap_pass_to_tx(chan, control);
4609
4610 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4611 l2cap_retransmit(chan, control);
4612 l2cap_ertm_send(chan);
4613
4614 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
4615 set_bit(CONN_SREJ_ACT, &chan->conn_state);
4616 chan->srej_save_reqseq = control->reqseq;
4617 }
4618 } else {
4619 l2cap_pass_to_tx_fbit(chan, control);
4620
4621 if (control->final) {
4622 if (chan->srej_save_reqseq != control->reqseq ||
4623 !test_and_clear_bit(CONN_SREJ_ACT,
4624 &chan->conn_state))
4625 l2cap_retransmit(chan, control);
4626 } else {
4627 l2cap_retransmit(chan, control);
4628 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
4629 set_bit(CONN_SREJ_ACT, &chan->conn_state);
4630 chan->srej_save_reqseq = control->reqseq;
4631 }
4632 }
4633 }
d2a7ac5d
MM		 4634}
4635
4636static void l2cap_handle_rej(struct l2cap_chan *chan,
4637 struct l2cap_ctrl *control)
4638{
fcd289df
MM		 4639 struct sk_buff *skb;
4640
4641 BT_DBG("chan %p, control %p", chan, control);
4642
4643 if (control->reqseq == chan->next_tx_seq) {
4644 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
4645 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4646 return;
4647 }
4648
4649 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
4650
4651 if (chan->max_tx && skb &&
4652 bt_cb(skb)->control.retries >= chan->max_tx) {
4653 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
4654 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4655 return;
4656 }
4657
4658 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4659
4660 l2cap_pass_to_tx(chan, control);
4661
4662 if (control->final) {
4663 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
4664 l2cap_retransmit_all(chan, control);
4665 } else {
4666 l2cap_retransmit_all(chan, control);
4667 l2cap_ertm_send(chan);
4668 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
4669 set_bit(CONN_REJ_ACT, &chan->conn_state);
4670 }
d2a7ac5d
MM		 4671}
4672
4b51dae9
MM		 4673static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
4674{
4675 BT_DBG("chan %p, txseq %d", chan, txseq);
4676
4677 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
4678 chan->expected_tx_seq);
4679
4680 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
4681 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
4682 chan->tx_win) {
4683 /* See notes below regarding "double poll" and
4684 * invalid packets.
4685 */
4686 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
4687 BT_DBG("Invalid/Ignore - after SREJ");
4688 return L2CAP_TXSEQ_INVALID_IGNORE;
4689 } else {
4690 BT_DBG("Invalid - in window after SREJ sent");
4691 return L2CAP_TXSEQ_INVALID;
4692 }
4693 }
4694
4695 if (chan->srej_list.head == txseq) {
4696 BT_DBG("Expected SREJ");
4697 return L2CAP_TXSEQ_EXPECTED_SREJ;
4698 }
4699
4700 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
4701 BT_DBG("Duplicate SREJ - txseq already stored");
4702 return L2CAP_TXSEQ_DUPLICATE_SREJ;
4703 }
4704
4705 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
4706 BT_DBG("Unexpected SREJ - not requested");
4707 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
4708 }
4709 }
4710
4711 if (chan->expected_tx_seq == txseq) {
4712 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
4713 chan->tx_win) {
4714 BT_DBG("Invalid - txseq outside tx window");
4715 return L2CAP_TXSEQ_INVALID;
4716 } else {
4717 BT_DBG("Expected");
4718 return L2CAP_TXSEQ_EXPECTED;
4719 }
4720 }
4721
4722 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
4723 __seq_offset(chan, chan->expected_tx_seq,
4724 chan->last_acked_seq)){
4725 BT_DBG("Duplicate - expected_tx_seq later than txseq");
4726 return L2CAP_TXSEQ_DUPLICATE;
4727 }
4728
4729 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
4730 /* A source of invalid packets is a "double poll" condition,
4731 * where delays cause us to send multiple poll packets. If
4732 * the remote stack receives and processes both polls,
4733 * sequence numbers can wrap around in such a way that a
4734 * resent frame has a sequence number that looks like new data
4735 * with a sequence gap. This would trigger an erroneous SREJ
4736 * request.
4737 *
4738 * Fortunately, this is impossible with a tx window that's
4739 * less than half of the maximum sequence number, which allows
4740 * invalid frames to be safely ignored.
4741 *
4742 * With tx window sizes greater than half of the tx window
4743 * maximum, the frame is invalid and cannot be ignored. This
4744 * causes a disconnect.
4745 */
4746
4747 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
4748 BT_DBG("Invalid/Ignore - txseq outside tx window");
4749 return L2CAP_TXSEQ_INVALID_IGNORE;
4750 } else {
4751 BT_DBG("Invalid - txseq outside tx window");
4752 return L2CAP_TXSEQ_INVALID;
4753 }
4754 } else {
4755 BT_DBG("Unexpected - txseq indicates missing frames");
4756 return L2CAP_TXSEQ_UNEXPECTED;
4757 }
4758}
4759
d2a7ac5d
MM		 4760static int l2cap_rx_state_recv(struct l2cap_chan *chan,
4761 struct l2cap_ctrl *control,
4762 struct sk_buff *skb, u8 event)
4763{
4764 int err = 0;
4765 bool skb_in_use = 0;
4766
4767 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
4768 event);
4769
4770 switch (event) {
4771 case L2CAP_EV_RECV_IFRAME:
4772 switch (l2cap_classify_txseq(chan, control->txseq)) {
4773 case L2CAP_TXSEQ_EXPECTED:
4774 l2cap_pass_to_tx(chan, control);
4775
4776 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4777 BT_DBG("Busy, discarding expected seq %d",
4778 control->txseq);
4779 break;
4780 }
4781
4782 chan->expected_tx_seq = __next_seq(chan,
4783 control->txseq);
4784
4785 chan->buffer_seq = chan->expected_tx_seq;
4786 skb_in_use = 1;
4787
4788 err = l2cap_reassemble_sdu(chan, skb, control);
4789 if (err)
4790 break;
4791
4792 if (control->final) {
4793 if (!test_and_clear_bit(CONN_REJ_ACT,
4794 &chan->conn_state)) {
4795 control->final = 0;
4796 l2cap_retransmit_all(chan, control);
4797 l2cap_ertm_send(chan);
4798 }
4799 }
4800
4801 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
4802 l2cap_send_ack(chan);
4803 break;
4804 case L2CAP_TXSEQ_UNEXPECTED:
4805 l2cap_pass_to_tx(chan, control);
4806
4807 /* Can't issue SREJ frames in the local busy state.
4808 * Drop this frame, it will be seen as missing
4809 * when local busy is exited.
4810 */
4811 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4812 BT_DBG("Busy, discarding unexpected seq %d",
4813 control->txseq);
4814 break;
4815 }
4816
4817 /* There was a gap in the sequence, so an SREJ
4818 * must be sent for each missing frame. The
4819 * current frame is stored for later use.
4820 */
4821 skb_queue_tail(&chan->srej_q, skb);
4822 skb_in_use = 1;
4823 BT_DBG("Queued %p (queue len %d)", skb,
4824 skb_queue_len(&chan->srej_q));
4825
4826 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
4827 l2cap_seq_list_clear(&chan->srej_list);
4828 l2cap_send_srej(chan, control->txseq);
4829
4830 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
4831 break;
4832 case L2CAP_TXSEQ_DUPLICATE:
4833 l2cap_pass_to_tx(chan, control);
4834 break;
4835 case L2CAP_TXSEQ_INVALID_IGNORE:
4836 break;
4837 case L2CAP_TXSEQ_INVALID:
4838 default:
4839 l2cap_send_disconn_req(chan->conn, chan,
4840 ECONNRESET);
4841 break;
4842 }
4843 break;
4844 case L2CAP_EV_RECV_RR:
4845 l2cap_pass_to_tx(chan, control);
4846 if (control->final) {
4847 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4848
4849 if (!test_and_clear_bit(CONN_REJ_ACT,
4850 &chan->conn_state)) {
4851 control->final = 0;
4852 l2cap_retransmit_all(chan, control);
4853 }
4854
4855 l2cap_ertm_send(chan);
4856 } else if (control->poll) {
4857 l2cap_send_i_or_rr_or_rnr(chan);
4858 } else {
4859 if (test_and_clear_bit(CONN_REMOTE_BUSY,
4860 &chan->conn_state) &&
4861 chan->unacked_frames)
4862 __set_retrans_timer(chan);
4863
4864 l2cap_ertm_send(chan);
4865 }
4866 break;
4867 case L2CAP_EV_RECV_RNR:
4868 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4869 l2cap_pass_to_tx(chan, control);
4870 if (control && control->poll) {
4871 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4872 l2cap_send_rr_or_rnr(chan, 0);
4873 }
4874 __clear_retrans_timer(chan);
4875 l2cap_seq_list_clear(&chan->retrans_list);
4876 break;
4877 case L2CAP_EV_RECV_REJ:
4878 l2cap_handle_rej(chan, control);
4879 break;
4880 case L2CAP_EV_RECV_SREJ:
4881 l2cap_handle_srej(chan, control);
4882 break;
4883 default:
4884 break;
4885 }
4886
4887 if (skb && !skb_in_use) {
4888 BT_DBG("Freeing %p", skb);
4889 kfree_skb(skb);
4890 }
4891
4892 return err;
4893}
4894
4895static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
4896 struct l2cap_ctrl *control,
4897 struct sk_buff *skb, u8 event)
4898{
4899 int err = 0;
4900 u16 txseq = control->txseq;
4901 bool skb_in_use = 0;
4902
4903 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
4904 event);
4905
4906 switch (event) {
4907 case L2CAP_EV_RECV_IFRAME:
4908 switch (l2cap_classify_txseq(chan, txseq)) {
4909 case L2CAP_TXSEQ_EXPECTED:
4910 /* Keep frame for reassembly later */
4911 l2cap_pass_to_tx(chan, control);
4912 skb_queue_tail(&chan->srej_q, skb);
4913 skb_in_use = 1;
4914 BT_DBG("Queued %p (queue len %d)", skb,
4915 skb_queue_len(&chan->srej_q));
4916
4917 chan->expected_tx_seq = __next_seq(chan, txseq);
4918 break;
4919 case L2CAP_TXSEQ_EXPECTED_SREJ:
4920 l2cap_seq_list_pop(&chan->srej_list);
4921
4922 l2cap_pass_to_tx(chan, control);
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 err = l2cap_rx_queued_iframes(chan);
4929 if (err)
4930 break;
4931
4932 break;
4933 case L2CAP_TXSEQ_UNEXPECTED:
4934 /* Got a frame that can't be reassembled yet.
4935 * Save it for later, and send SREJs to cover
4936 * the missing frames.
4937 */
4938 skb_queue_tail(&chan->srej_q, skb);
4939 skb_in_use = 1;
4940 BT_DBG("Queued %p (queue len %d)", skb,
4941 skb_queue_len(&chan->srej_q));
4942
4943 l2cap_pass_to_tx(chan, control);
4944 l2cap_send_srej(chan, control->txseq);
4945 break;
4946 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
4947 /* This frame was requested with an SREJ, but
4948 * some expected retransmitted frames are
4949 * missing. Request retransmission of missing
4950 * SREJ'd frames.
4951 */
4952 skb_queue_tail(&chan->srej_q, skb);
4953 skb_in_use = 1;
4954 BT_DBG("Queued %p (queue len %d)", skb,
4955 skb_queue_len(&chan->srej_q));
4956
4957 l2cap_pass_to_tx(chan, control);
4958 l2cap_send_srej_list(chan, control->txseq);
4959 break;
4960 case L2CAP_TXSEQ_DUPLICATE_SREJ:
4961 /* We've already queued this frame. Drop this copy. */
4962 l2cap_pass_to_tx(chan, control);
4963 break;
4964 case L2CAP_TXSEQ_DUPLICATE:
4965 /* Expecting a later sequence number, so this frame
4966 * was already received. Ignore it completely.
4967 */
4968 break;
4969 case L2CAP_TXSEQ_INVALID_IGNORE:
4970 break;
4971 case L2CAP_TXSEQ_INVALID:
4972 default:
4973 l2cap_send_disconn_req(chan->conn, chan,
4974 ECONNRESET);
4975 break;
4976 }
4977 break;
4978 case L2CAP_EV_RECV_RR:
4979 l2cap_pass_to_tx(chan, control);
4980 if (control->final) {
4981 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4982
4983 if (!test_and_clear_bit(CONN_REJ_ACT,
4984 &chan->conn_state)) {
4985 control->final = 0;
4986 l2cap_retransmit_all(chan, control);
4987 }
4988
4989 l2cap_ertm_send(chan);
4990 } else if (control->poll) {
4991 if (test_and_clear_bit(CONN_REMOTE_BUSY,
4992 &chan->conn_state) &&
4993 chan->unacked_frames) {
4994 __set_retrans_timer(chan);
4995 }
4996
4997 set_bit(CONN_SEND_FBIT, &chan->conn_state);
4998 l2cap_send_srej_tail(chan);
4999 } else {
5000 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5001 &chan->conn_state) &&
5002 chan->unacked_frames)
5003 __set_retrans_timer(chan);
5004
5005 l2cap_send_ack(chan);
5006 }
5007 break;
5008 case L2CAP_EV_RECV_RNR:
5009 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5010 l2cap_pass_to_tx(chan, control);
5011 if (control->poll) {
5012 l2cap_send_srej_tail(chan);
5013 } else {
5014 struct l2cap_ctrl rr_control;
5015 memset(&rr_control, 0, sizeof(rr_control));
5016 rr_control.sframe = 1;
5017 rr_control.super = L2CAP_SUPER_RR;
5018 rr_control.reqseq = chan->buffer_seq;
5019 l2cap_send_sframe(chan, &rr_control);
5020 }
5021
5022 break;
5023 case L2CAP_EV_RECV_REJ:
5024 l2cap_handle_rej(chan, control);
5025 break;
5026 case L2CAP_EV_RECV_SREJ:
5027 l2cap_handle_srej(chan, control);
5028 break;
5029 }
5030
5031 if (skb && !skb_in_use) {
5032 BT_DBG("Freeing %p", skb);
5033 kfree_skb(skb);
5034 }
5035
5036 return err;
5037}
5038
5039static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
5040{
5041 /* Make sure reqseq is for a packet that has been sent but not acked */
5042 u16 unacked;
5043
5044 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
5045 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
5046}
5047
cec8ab6e
MM		 5048static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5049 struct sk_buff *skb, u8 event)
218bb9df 5050{
d2a7ac5d
MM		 5051 int err = 0;
5052
5053 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
5054 control, skb, event, chan->rx_state);
5055
5056 if (__valid_reqseq(chan, control->reqseq)) {
5057 switch (chan->rx_state) {
5058 case L2CAP_RX_STATE_RECV:
5059 err = l2cap_rx_state_recv(chan, control, skb, event);
5060 break;
5061 case L2CAP_RX_STATE_SREJ_SENT:
5062 err = l2cap_rx_state_srej_sent(chan, control, skb,
5063 event);
5064 break;
5065 default:
5066 /* shut it down */
5067 break;
5068 }
5069 } else {
5070 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
5071 control->reqseq, chan->next_tx_seq,
5072 chan->expected_ack_seq);
5073 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
5074 }
5075
5076 return err;
cec8ab6e
MM		 5077}
5078
5079static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5080 struct sk_buff *skb)
5081{
4b51dae9
MM		 5082 int err = 0;
5083
5084 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
5085 chan->rx_state);
5086
5087 if (l2cap_classify_txseq(chan, control->txseq) ==
5088 L2CAP_TXSEQ_EXPECTED) {
5089 l2cap_pass_to_tx(chan, control);
5090
5091 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
5092 __next_seq(chan, chan->buffer_seq));
5093
5094 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5095
5096 l2cap_reassemble_sdu(chan, skb, control);
5097 } else {
5098 if (chan->sdu) {
5099 kfree_skb(chan->sdu);
5100 chan->sdu = NULL;
5101 }
5102 chan->sdu_last_frag = NULL;
5103 chan->sdu_len = 0;
5104
5105 if (skb) {
5106 BT_DBG("Freeing %p", skb);
5107 kfree_skb(skb);
5108 }
5109 }
5110
5111 chan->last_acked_seq = control->txseq;
5112 chan->expected_tx_seq = __next_seq(chan, control->txseq);
5113
5114 return err;
cec8ab6e
MM		 5115}
5116
5117static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
5118{
5119 struct l2cap_ctrl *control = &bt_cb(skb)->control;
5120 u16 len;
5121 u8 event;
218bb9df 5122
b76bbd66
MM		 5123 __unpack_control(chan, skb);
5124
218bb9df
GP		 5125 len = skb->len;
5126
5127 /*
5128 * We can just drop the corrupted I-frame here.
5129 * Receiver will miss it and start proper recovery
cec8ab6e 5130 * procedures and ask for retransmission.
218bb9df 5131 */
47d1ec61 5132 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 5133 goto drop;
5134
cec8ab6e 5135 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 5136 len -= L2CAP_SDULEN_SIZE;
218bb9df 5137
47d1ec61 5138 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 5139 len -= L2CAP_FCS_SIZE;
218bb9df 5140
47d1ec61 5141 if (len > chan->mps) {
8c1d787b 5142 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5143 goto drop;
5144 }
5145
cec8ab6e
MM		 5146 if (!control->sframe) {
5147 int err;
218bb9df 5148
cec8ab6e
MM		 5149 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
5150 control->sar, control->reqseq, control->final,
5151 control->txseq);
218bb9df 5152
cec8ab6e
MM		 5153 /* Validate F-bit - F=0 always valid, F=1 only
5154 * valid in TX WAIT_F
5155 */
5156 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 5157 goto drop;
cec8ab6e
MM		 5158
5159 if (chan->mode != L2CAP_MODE_STREAMING) {
5160 event = L2CAP_EV_RECV_IFRAME;
5161 err = l2cap_rx(chan, control, skb, event);
5162 } else {
5163 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 5164 }
5165
cec8ab6e
MM		 5166 if (err)
5167 l2cap_send_disconn_req(chan->conn, chan,
5168 ECONNRESET);
218bb9df 5169 } else {
cec8ab6e
MM		 5170 const u8 rx_func_to_event[4] = {
5171 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
5172 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
5173 };
5174
5175 /* Only I-frames are expected in streaming mode */
5176 if (chan->mode == L2CAP_MODE_STREAMING)
5177 goto drop;
5178
5179 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
5180 control->reqseq, control->final, control->poll,
5181 control->super);
5182
218bb9df
GP		 5183 if (len != 0) {
5184 BT_ERR("%d", len);
8c1d787b 5185 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5186 goto drop;
5187 }
5188
cec8ab6e
MM		 5189 /* Validate F and P bits */
5190 if (control->final && (control->poll ||
5191 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
5192 goto drop;
5193
5194 event = rx_func_to_event[control->super];
5195 if (l2cap_rx(chan, control, skb, event))
5196 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 5197 }
5198
5199 return 0;
5200
5201drop:
5202 kfree_skb(skb);
5203 return 0;
5204}
5205
1da177e4
LT		 5206static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
5207{
48454079 5208 struct l2cap_chan *chan;
1da177e4 5209
baa7e1fa 5210 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 5211 if (!chan) {
1da177e4 5212 BT_DBG("unknown cid 0x%4.4x", cid);
6be36555 5213 /* Drop packet and return */
3379013b 5214 kfree_skb(skb);
6be36555 5215 return 0;
1da177e4
LT		 5216 }
5217
49208c9c 5218 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 5219
89bc500e 5220 if (chan->state != BT_CONNECTED)
1da177e4
LT		 5221 goto drop;
5222
0c1bc5c6 5223 switch (chan->mode) {
1c2acffb
GP		 5224 case L2CAP_MODE_BASIC:
5225 /* If socket recv buffers overflows we drop data here
5226 * which is *bad* because L2CAP has to be reliable.
5227 * But we don't have any other choice. L2CAP doesn't
5228 * provide flow control mechanism. */
1da177e4 5229
0c1bc5c6 5230 if (chan->imtu < skb->len)
1c2acffb 5231 goto drop;
1da177e4 5232
23070494 5233 if (!chan->ops->recv(chan->data, skb))
1c2acffb
GP		 5234 goto done;
5235 break;
5236
5237 case L2CAP_MODE_ERTM:
6840ed07 5238 case L2CAP_MODE_STREAMING:
cec8ab6e 5239 l2cap_data_rcv(chan, skb);
6840ed07
GP		 5240 goto done;
5241
1c2acffb 5242 default:
0c1bc5c6 5243 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 5244 break;
5245 }
1da177e4
LT		 5246
5247drop:
5248 kfree_skb(skb);
5249
5250done:
6be36555 5251 l2cap_chan_unlock(chan);
0139418c 5252
1da177e4
LT		 5253 return 0;
5254}
5255
8e036fc3 5256static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4 5257{
23691d75 5258 struct l2cap_chan *chan;
1da177e4 5259
c2287681 5260 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 5261 if (!chan)
1da177e4
LT		 5262 goto drop;
5263
5b4cedaa 5264 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 5265
89bc500e 5266 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 5267 goto drop;
5268
e13e21dc 5269 if (chan->imtu < skb->len)
1da177e4
LT		 5270 goto drop;
5271
23070494 5272 if (!chan->ops->recv(chan->data, skb))
5b4cedaa 5273 return 0;
1da177e4
LT		 5274
5275drop:
5276 kfree_skb(skb);
5277
1da177e4
LT		 5278 return 0;
5279}
5280
d9b88702
AE		 5281static inline int l2cap_att_channel(struct l2cap_conn *conn, u16 cid,
5282 struct sk_buff *skb)
9f69bda6 5283{
23691d75 5284 struct l2cap_chan *chan;
9f69bda6 5285
c2287681 5286 chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst);
23691d75 5287 if (!chan)
9f69bda6
GP		 5288 goto drop;
5289
5b4cedaa 5290 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 5291
89bc500e 5292 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 5293 goto drop;
5294
e13e21dc 5295 if (chan->imtu < skb->len)
9f69bda6
GP		 5296 goto drop;
5297
23070494 5298 if (!chan->ops->recv(chan->data, skb))
5b4cedaa 5299 return 0;
9f69bda6
GP		 5300
5301drop:
5302 kfree_skb(skb);
5303
9f69bda6
GP		 5304 return 0;
5305}
5306
1da177e4
LT		 5307static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
5308{
5309 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 5310 u16 cid, len;
5311 __le16 psm;
1da177e4
LT		 5312
5313 skb_pull(skb, L2CAP_HDR_SIZE);
5314 cid = __le16_to_cpu(lh->cid);
5315 len = __le16_to_cpu(lh->len);
5316
1c2acffb
GP		 5317 if (len != skb->len) {
5318 kfree_skb(skb);
5319 return;
5320 }
5321
1da177e4
LT		 5322 BT_DBG("len %d, cid 0x%4.4x", len, cid);
5323
5324 switch (cid) {
3300d9a9 5325 case L2CAP_CID_LE_SIGNALING:
8db4dc46 5326 case L2CAP_CID_SIGNALING:
1da177e4
LT		 5327 l2cap_sig_channel(conn, skb);
5328 break;
5329
8db4dc46 5330 case L2CAP_CID_CONN_LESS:
097db76c 5331 psm = get_unaligned((__le16 *) skb->data);
1da177e4
LT		 5332 skb_pull(skb, 2);
5333 l2cap_conless_channel(conn, psm, skb);
5334 break;
5335
9f69bda6
GP		 5336 case L2CAP_CID_LE_DATA:
5337 l2cap_att_channel(conn, cid, skb);
5338 break;
5339
b501d6a1
AB		 5340 case L2CAP_CID_SMP:
5341 if (smp_sig_channel(conn, skb))
5342 l2cap_conn_del(conn->hcon, EACCES);
5343 break;
5344
1da177e4
LT		 5345 default:
5346 l2cap_data_channel(conn, cid, skb);
5347 break;
5348 }
5349}
5350
5351/* ---- L2CAP interface with lower layer (HCI) ---- */
5352
686ebf28 5353int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 5354{
5355 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 5356 struct l2cap_chan *c;
1da177e4 5357
1da177e4
LT		 5358 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
5359
5360 /* Find listening sockets and check their link_mode */
23691d75
GP		 5361 read_lock(&chan_list_lock);
5362 list_for_each_entry(c, &chan_list, global_l) {
5363 struct sock *sk = c->sk;
4343478f 5364
89bc500e 5365 if (c->state != BT_LISTEN)
1da177e4
LT		 5366 continue;
5367
5368 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 5369 lm1 |= HCI_LM_ACCEPT;
43bd0f32 5370 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 5371 lm1 |= HCI_LM_MASTER;
1da177e4 5372 exact++;
2af6b9d5
MH		 5373 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
5374 lm2 |= HCI_LM_ACCEPT;
43bd0f32 5375 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 5376 lm2 |= HCI_LM_MASTER;
5377 }
1da177e4 5378 }
23691d75 5379 read_unlock(&chan_list_lock);
1da177e4
LT		 5380
5381 return exact ? lm1 : lm2;
5382}
5383
686ebf28 5384int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 5385{
0139418c
MH		 5386 struct l2cap_conn *conn;
5387
1da177e4
LT		 5388 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
5389
1da177e4 5390 if (!status) {
1da177e4
LT		 5391 conn = l2cap_conn_add(hcon, status);
5392 if (conn)
5393 l2cap_conn_ready(conn);
0139418c 5394 } else
e175072f 5395 l2cap_conn_del(hcon, bt_to_errno(status));
1da177e4
LT		 5396
5397 return 0;
5398}
5399
686ebf28 5400int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 5401{
5402 struct l2cap_conn *conn = hcon->l2cap_data;
5403
5404 BT_DBG("hcon %p", hcon);
5405
686ebf28 5406 if (!conn)
9f5a0d7b 5407 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 5408 return conn->disc_reason;
5409}
5410
686ebf28 5411int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 5412{
5413 BT_DBG("hcon %p reason %d", hcon, reason);
5414
e175072f 5415 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 5416 return 0;
5417}
5418
4343478f 5419static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 5420{
715ec005 5421 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 5422 return;
5423
f62e4323 5424 if (encrypt == 0x00) {
4343478f 5425 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 5426 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 5427 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 5428 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 5429 } else {
4343478f 5430 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 5431 __clear_chan_timer(chan);
f62e4323
MH		 5432 }
5433}
5434
686ebf28 5435int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 5436{
0139418c 5437 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 5438 struct l2cap_chan *chan;
1da177e4 5439
0139418c 5440 if (!conn)
1da177e4 5441 return 0;
0139418c 5442
1da177e4
LT		 5443 BT_DBG("conn %p", conn);
5444
160dc6ac 5445 if (hcon->type == LE_LINK) {
35d4adcc
HG		 5446 if (!status && encrypt)
5447 smp_distribute_keys(conn, 0);
17cd3f37 5448 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 5449 }
5450
3df91ea2 5451 mutex_lock(&conn->chan_lock);
1da177e4 5452
3df91ea2 5453 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 5454 l2cap_chan_lock(chan);
1da177e4 5455
f1cb9af5
VCG		 5456 BT_DBG("chan->scid %d", chan->scid);
5457
5458 if (chan->scid == L2CAP_CID_LE_DATA) {
5459 if (!status && encrypt) {
5460 chan->sec_level = hcon->sec_level;
cf4cd009 5461 l2cap_chan_ready(chan);
f1cb9af5
VCG		 5462 }
5463
6be36555 5464 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 5465 continue;
5466 }
5467
c1360a1c 5468 if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
6be36555 5469 l2cap_chan_unlock(chan);
6a8d3010
MH		 5470 continue;
5471 }
5472
89bc500e
GP		 5473 if (!status && (chan->state == BT_CONNECTED ||
5474 chan->state == BT_CONFIG)) {
a7d7723a
GP		 5475 struct sock *sk = chan->sk;
5476
c5daa683 5477 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
a7d7723a
GP		 5478 sk->sk_state_change(sk);
5479
4343478f 5480 l2cap_check_encryption(chan, encrypt);
6be36555 5481 l2cap_chan_unlock(chan);
9719f8af
MH		 5482 continue;
5483 }
5484
89bc500e 5485 if (chan->state == BT_CONNECT) {
b1235d79 5486 if (!status) {
9b27f350 5487 l2cap_send_conn_req(chan);
b1235d79 5488 } else {
ba13ccd9 5489 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 5490 }
89bc500e 5491 } else if (chan->state == BT_CONNECT2) {
6be36555 5492 struct sock *sk = chan->sk;
b1235d79 5493 struct l2cap_conn_rsp rsp;
df3c3931 5494 __u16 res, stat;
1da177e4 5495
6be36555
AE		 5496 lock_sock(sk);
5497
b1235d79 5498 if (!status) {
c5daa683
GP		 5499 if (test_bit(BT_SK_DEFER_SETUP,
5500 &bt_sk(sk)->flags)) {
df3c3931
JH		 5501 struct sock *parent = bt_sk(sk)->parent;
5502 res = L2CAP_CR_PEND;
5503 stat = L2CAP_CS_AUTHOR_PEND;
05e9a2f6
IK		 5504 if (parent)
5505 parent->sk_data_ready(parent, 0);
df3c3931 5506 } else {
0e587be7 5507 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 5508 res = L2CAP_CR_SUCCESS;
5509 stat = L2CAP_CS_NO_INFO;
5510 }
b1235d79 5511 } else {
0e587be7 5512 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 5513 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 5514 res = L2CAP_CR_SEC_BLOCK;
5515 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 5516 }
5517
6be36555
AE		 5518 release_sock(sk);
5519
fe4128e0
GP		 5520 rsp.scid = cpu_to_le16(chan->dcid);
5521 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 5522 rsp.result = cpu_to_le16(res);
5523 rsp.status = cpu_to_le16(stat);
fc7f8a7e
GP		 5524 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
5525 sizeof(rsp), &rsp);
b1235d79 5526 }
1da177e4 5527
6be36555 5528 l2cap_chan_unlock(chan);
1da177e4
LT		 5529 }
5530
3df91ea2 5531 mutex_unlock(&conn->chan_lock);
b1235d79 5532
1da177e4
LT		 5533 return 0;
5534}
5535
686ebf28 5536int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 5537{
5538 struct l2cap_conn *conn = hcon->l2cap_data;
5539
5a08ecce
AE		 5540 if (!conn)
5541 conn = l2cap_conn_add(hcon, 0);
5542
5543 if (!conn)
1da177e4
LT		 5544 goto drop;
5545
5546 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
5547
e702112f 5548 if (!(flags & ACL_CONT)) {
1da177e4
LT		 5549 struct l2cap_hdr *hdr;
5550 int len;
5551
5552 if (conn->rx_len) {
5553 BT_ERR("Unexpected start frame (len %d)", skb->len);
5554 kfree_skb(conn->rx_skb);
5555 conn->rx_skb = NULL;
5556 conn->rx_len = 0;
5557 l2cap_conn_unreliable(conn, ECOMM);
5558 }
5559
aae7fe22
AE		 5560 /* Start fragment always begin with Basic L2CAP header */
5561 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 5562 BT_ERR("Frame is too short (len %d)", skb->len);
5563 l2cap_conn_unreliable(conn, ECOMM);
5564 goto drop;
5565 }
5566
5567 hdr = (struct l2cap_hdr *) skb->data;
5568 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
5569
5570 if (len == skb->len) {
5571 /* Complete frame received */
5572 l2cap_recv_frame(conn, skb);
5573 return 0;
5574 }
5575
5576 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
5577
5578 if (skb->len > len) {
5579 BT_ERR("Frame is too long (len %d, expected len %d)",
5580 skb->len, len);
5581 l2cap_conn_unreliable(conn, ECOMM);
5582 goto drop;
5583 }
5584
5585 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 5586 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
5587 if (!conn->rx_skb)
1da177e4
LT		 5588 goto drop;
5589
d626f62b 5590 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 5591 skb->len);
1da177e4
LT		 5592 conn->rx_len = len - skb->len;
5593 } else {
5594 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
5595
5596 if (!conn->rx_len) {
5597 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
5598 l2cap_conn_unreliable(conn, ECOMM);
5599 goto drop;
5600 }
5601
5602 if (skb->len > conn->rx_len) {
5603 BT_ERR("Fragment is too long (len %d, expected %d)",
5604 skb->len, conn->rx_len);
5605 kfree_skb(conn->rx_skb);
5606 conn->rx_skb = NULL;
5607 conn->rx_len = 0;
5608 l2cap_conn_unreliable(conn, ECOMM);
5609 goto drop;
5610 }
5611
d626f62b 5612 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 5613 skb->len);
1da177e4
LT		 5614 conn->rx_len -= skb->len;
5615
5616 if (!conn->rx_len) {
5617 /* Complete frame received */
5618 l2cap_recv_frame(conn, conn->rx_skb);
5619 conn->rx_skb = NULL;
5620 }
5621 }
5622
5623drop:
5624 kfree_skb(skb);
5625 return 0;
5626}
5627
aef7d97c 5628static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 5629{
23691d75 5630 struct l2cap_chan *c;
1da177e4 5631
333055f2 5632 read_lock(&chan_list_lock);
1da177e4 5633
23691d75
GP		 5634 list_for_each_entry(c, &chan_list, global_l) {
5635 struct sock *sk = c->sk;
101545f6 5636
903d343e 5637 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
aef7d97c
MH		 5638 batostr(&bt_sk(sk)->src),
5639 batostr(&bt_sk(sk)->dst),
89bc500e 5640 c->state, __le16_to_cpu(c->psm),
23691d75
GP		 5641 c->scid, c->dcid, c->imtu, c->omtu,
5642 c->sec_level, c->mode);
61e1b4b7 5643 }
1da177e4 5644
333055f2 5645 read_unlock(&chan_list_lock);
1da177e4 5646
aef7d97c 5647 return 0;
1da177e4
LT		 5648}
5649
aef7d97c
MH		 5650static int l2cap_debugfs_open(struct inode *inode, struct file *file)
5651{
5652 return single_open(file, l2cap_debugfs_show, inode->i_private);
5653}
5654
5655static const struct file_operations l2cap_debugfs_fops = {
5656 .open = l2cap_debugfs_open,
5657 .read = seq_read,
5658 .llseek = seq_lseek,
5659 .release = single_release,
5660};
5661
5662static struct dentry *l2cap_debugfs;
1da177e4 5663
64274518 5664int __init l2cap_init(void)
1da177e4
LT		 5665{
5666 int err;
be9d1227 5667
bb58f747 5668 err = l2cap_init_sockets();
1da177e4
LT		 5669 if (err < 0)
5670 return err;
5671
aef7d97c
MH		 5672 if (bt_debugfs) {
5673 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
5674 bt_debugfs, NULL, &l2cap_debugfs_fops);
5675 if (!l2cap_debugfs)
5676 BT_ERR("Failed to create L2CAP debug file");
5677 }
1da177e4 5678
1da177e4 5679 return 0;
1da177e4
LT		 5680}
5681
64274518 5682void l2cap_exit(void)
1da177e4 5683{
aef7d97c 5684 debugfs_remove(l2cap_debugfs);
bb58f747 5685 l2cap_cleanup_sockets();
1da177e4
LT		 5686}
5687
d1c4a17d
GP		 5688module_param(disable_ertm, bool, 0644);
5689MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)