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Bluetooth: Disable FCS only for new HS channels
[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
aef7d97c 33#include <linux/debugfs.h>
fcc203c3 34#include <linux/crc16.h>
1da177e4
LT		 35
36#include <net/bluetooth/bluetooth.h>
37#include <net/bluetooth/hci_core.h>
38#include <net/bluetooth/l2cap.h>
b501d6a1 39#include <net/bluetooth/smp.h>
97e8e89d 40#include <net/bluetooth/a2mp.h>
5ce66b59 41#include <net/bluetooth/amp.h>
1da177e4 42
d1de6d46 43bool disable_ertm;
f0709e03 44
47ec1dcd 45static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
50a147cd 46static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
1da177e4 47
b5ad8b7f
JB		 48static LIST_HEAD(chan_list);
49static DEFINE_RWLOCK(chan_list_lock);
1da177e4 50
1da177e4 51static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 52 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 53static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 54 void *data);
710f9b0a 55static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
4519de9a 56static void l2cap_send_disconn_req(struct l2cap_conn *conn,
c5daa683 57 struct l2cap_chan *chan, int err);
1da177e4 58
d660366d 59static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 60 struct sk_buff_head *skbs, u8 event);
608bcc6d 61
0139418c 62/* ---- L2CAP channels ---- */
71ba0e56 63
2d792818
GP		 64static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
65 u16 cid)
0139418c 66{
3df91ea2 67 struct l2cap_chan *c;
3d57dc68 68
3df91ea2
AE		 69 list_for_each_entry(c, &conn->chan_l, list) {
70 if (c->dcid == cid)
71 return c;
0139418c 72 }
3df91ea2 73 return NULL;
0139418c
MH		 74}
75
2d792818
GP		 76static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
77 u16 cid)
0139418c 78{
3df91ea2 79 struct l2cap_chan *c;
3d57dc68 80
3df91ea2
AE		 81 list_for_each_entry(c, &conn->chan_l, list) {
82 if (c->scid == cid)
83 return c;
0139418c 84 }
3df91ea2 85 return NULL;
0139418c
MH		 86}
87
88/* Find channel with given SCID.
ef191ade 89 * Returns locked channel. */
2d792818
GP		 90static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
91 u16 cid)
0139418c 92{
48454079 93 struct l2cap_chan *c;
baa7e1fa 94
3df91ea2 95 mutex_lock(&conn->chan_lock);
baa7e1fa 96 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 97 if (c)
98 l2cap_chan_lock(c);
3df91ea2
AE		 99 mutex_unlock(&conn->chan_lock);
100
48454079 101 return c;
0139418c
MH		 102}
103
b1a130b7
MM		 104/* Find channel with given DCID.
105 * Returns locked channel.
106 */
107static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
108 u16 cid)
109{
110 struct l2cap_chan *c;
111
112 mutex_lock(&conn->chan_lock);
113 c = __l2cap_get_chan_by_dcid(conn, cid);
114 if (c)
115 l2cap_chan_lock(c);
116 mutex_unlock(&conn->chan_lock);
117
118 return c;
119}
120
2d792818
GP		 121static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
122 u8 ident)
0139418c 123{
3df91ea2 124 struct l2cap_chan *c;
3d57dc68 125
3df91ea2
AE		 126 list_for_each_entry(c, &conn->chan_l, list) {
127 if (c->ident == ident)
128 return c;
0139418c 129 }
3df91ea2 130 return NULL;
0139418c
MH		 131}
132
5b155ef9
MM		 133static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
134 u8 ident)
135{
136 struct l2cap_chan *c;
137
138 mutex_lock(&conn->chan_lock);
139 c = __l2cap_get_chan_by_ident(conn, ident);
140 if (c)
141 l2cap_chan_lock(c);
142 mutex_unlock(&conn->chan_lock);
143
144 return c;
145}
146
23691d75 147static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 148{
23691d75 149 struct l2cap_chan *c;
9e4425ff 150
23691d75
GP		 151 list_for_each_entry(c, &chan_list, global_l) {
152 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
250938cb 153 return c;
9e4425ff 154 }
250938cb 155 return NULL;
9e4425ff
GP		 156}
157
158int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
159{
73b2ec18
GP		 160 int err;
161
333055f2 162 write_lock(&chan_list_lock);
9e4425ff 163
23691d75 164 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 165 err = -EADDRINUSE;
166 goto done;
9e4425ff
GP		 167 }
168
73b2ec18
GP		 169 if (psm) {
170 chan->psm = psm;
171 chan->sport = psm;
172 err = 0;
173 } else {
174 u16 p;
175
176 err = -EINVAL;
177 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 178 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 179 chan->psm = cpu_to_le16(p);
180 chan->sport = cpu_to_le16(p);
181 err = 0;
182 break;
183 }
184 }
9e4425ff 185
73b2ec18 186done:
333055f2 187 write_unlock(&chan_list_lock);
73b2ec18 188 return err;
9e4425ff
GP		 189}
190
191int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
192{
333055f2 193 write_lock(&chan_list_lock);
9e4425ff
GP		 194
195 chan->scid = scid;
196
333055f2 197 write_unlock(&chan_list_lock);
9e4425ff
GP		 198
199 return 0;
200}
201
baa7e1fa 202static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 203{
8db4dc46 204 u16 cid = L2CAP_CID_DYN_START;
0139418c 205
8db4dc46 206 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 207 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 208 return cid;
209 }
210
211 return 0;
212}
213
0e587be7 214static void __l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 215{
42d2d87c 216 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 217 state_to_string(state));
badaaa00 218
89bc500e 219 chan->state = state;
80b98027 220 chan->ops->state_change(chan, state);
89bc500e
GP		 221}
222
0e587be7
AE		 223static void l2cap_state_change(struct l2cap_chan *chan, int state)
224{
225 struct sock *sk = chan->sk;
226
227 lock_sock(sk);
228 __l2cap_state_change(chan, state);
229 release_sock(sk);
230}
231
2e0052e4
AE		 232static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err)
233{
234 struct sock *sk = chan->sk;
235
236 sk->sk_err = err;
237}
238
239static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
240{
241 struct sock *sk = chan->sk;
242
243 lock_sock(sk);
244 __l2cap_chan_set_err(chan, err);
245 release_sock(sk);
246}
247
4239d16f
MM		 248static void __set_retrans_timer(struct l2cap_chan *chan)
249{
250 if (!delayed_work_pending(&chan->monitor_timer) &&
251 chan->retrans_timeout) {
252 l2cap_set_timer(chan, &chan->retrans_timer,
253 msecs_to_jiffies(chan->retrans_timeout));
254 }
255}
256
257static void __set_monitor_timer(struct l2cap_chan *chan)
258{
259 __clear_retrans_timer(chan);
260 if (chan->monitor_timeout) {
261 l2cap_set_timer(chan, &chan->monitor_timer,
262 msecs_to_jiffies(chan->monitor_timeout));
263 }
264}
265
608bcc6d
MM		 266static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
267 u16 seq)
268{
269 struct sk_buff *skb;
270
271 skb_queue_walk(head, skb) {
272 if (bt_cb(skb)->control.txseq == seq)
273 return skb;
274 }
275
276 return NULL;
277}
278
3c588192
MM		 279/* ---- L2CAP sequence number lists ---- */
280
281/* For ERTM, ordered lists of sequence numbers must be tracked for
282 * SREJ requests that are received and for frames that are to be
283 * retransmitted. These seq_list functions implement a singly-linked
284 * list in an array, where membership in the list can also be checked
285 * in constant time. Items can also be added to the tail of the list
286 * and removed from the head in constant time, without further memory
287 * allocs or frees.
288 */
289
290static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
291{
292 size_t alloc_size, i;
293
294 /* Allocated size is a power of 2 to map sequence numbers
295 * (which may be up to 14 bits) in to a smaller array that is
296 * sized for the negotiated ERTM transmit windows.
297 */
298 alloc_size = roundup_pow_of_two(size);
299
300 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
301 if (!seq_list->list)
302 return -ENOMEM;
303
304 seq_list->mask = alloc_size - 1;
305 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
306 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
307 for (i = 0; i < alloc_size; i++)
308 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
309
310 return 0;
311}
312
313static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
314{
315 kfree(seq_list->list);
316}
317
318static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
319 u16 seq)
320{
321 /* Constant-time check for list membership */
322 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
323}
324
325static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
326{
327 u16 mask = seq_list->mask;
328
329 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
330 /* In case someone tries to pop the head of an empty list */
331 return L2CAP_SEQ_LIST_CLEAR;
332 } else if (seq_list->head == seq) {
333 /* Head can be removed in constant time */
334 seq_list->head = seq_list->list[seq & mask];
335 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
336
337 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
338 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
339 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
340 }
341 } else {
342 /* Walk the list to find the sequence number */
343 u16 prev = seq_list->head;
344 while (seq_list->list[prev & mask] != seq) {
345 prev = seq_list->list[prev & mask];
346 if (prev == L2CAP_SEQ_LIST_TAIL)
347 return L2CAP_SEQ_LIST_CLEAR;
348 }
349
350 /* Unlink the number from the list and clear it */
351 seq_list->list[prev & mask] = seq_list->list[seq & mask];
352 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
353 if (seq_list->tail == seq)
354 seq_list->tail = prev;
355 }
356 return seq;
357}
358
359static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
360{
361 /* Remove the head in constant time */
362 return l2cap_seq_list_remove(seq_list, seq_list->head);
363}
364
365static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
366{
f522ae36 367 u16 i;
3c588192 368
f522ae36
GP		 369 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
370 return;
371
372 for (i = 0; i <= seq_list->mask; i++)
373 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
374
375 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
376 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 377}
378
379static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
380{
381 u16 mask = seq_list->mask;
382
383 /* All appends happen in constant time */
384
f522ae36
GP		 385 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
386 return;
3c588192 387
f522ae36
GP		 388 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
389 seq_list->head = seq;
390 else
391 seq_list->list[seq_list->tail & mask] = seq;
392
393 seq_list->tail = seq;
394 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 395}
396
721c4181 397static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 398{
721c4181 399 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 400 chan_timer.work);
3df91ea2 401 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 402 int reason;
403
e05dcc32 404 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 405
3df91ea2 406 mutex_lock(&conn->chan_lock);
6be36555 407 l2cap_chan_lock(chan);
ab07801d 408
89bc500e 409 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 410 reason = ECONNREFUSED;
89bc500e 411 else if (chan->state == BT_CONNECT &&
2d792818 412 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 413 reason = ECONNREFUSED;
414 else
415 reason = ETIMEDOUT;
416
0f852724 417 l2cap_chan_close(chan, reason);
ab07801d 418
6be36555 419 l2cap_chan_unlock(chan);
ab07801d 420
80b98027 421 chan->ops->close(chan);
3df91ea2
AE		 422 mutex_unlock(&conn->chan_lock);
423
371fd835 424 l2cap_chan_put(chan);
ab07801d
GP		 425}
426
eef1d9b6 427struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 428{
429 struct l2cap_chan *chan;
430
431 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
432 if (!chan)
433 return NULL;
434
c03b355e
AE		 435 mutex_init(&chan->lock);
436
333055f2 437 write_lock(&chan_list_lock);
23691d75 438 list_add(&chan->global_l, &chan_list);
333055f2 439 write_unlock(&chan_list_lock);
23691d75 440
721c4181 441 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 442
89bc500e
GP		 443 chan->state = BT_OPEN;
444
144ad330 445 kref_init(&chan->kref);
71ba0e56 446
2827011f
MM		 447 /* This flag is cleared in l2cap_chan_ready() */
448 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
449
eef1d9b6 450 BT_DBG("chan %p", chan);
abc545b8 451
48454079
GP		 452 return chan;
453}
454
144ad330 455static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 456{
144ad330
SS		 457 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
458
4af66c69
JK		 459 BT_DBG("chan %p", chan);
460
333055f2 461 write_lock(&chan_list_lock);
23691d75 462 list_del(&chan->global_l);
333055f2 463 write_unlock(&chan_list_lock);
23691d75 464
4af66c69 465 kfree(chan);
6ff5abbf
GP		 466}
467
30648372
JK		 468void l2cap_chan_hold(struct l2cap_chan *c)
469{
144ad330 470 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 471
144ad330 472 kref_get(&c->kref);
30648372
JK		 473}
474
475void l2cap_chan_put(struct l2cap_chan *c)
476{
144ad330 477 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 478
144ad330 479 kref_put(&c->kref, l2cap_chan_destroy);
30648372
JK		 480}
481
bd4b1653
AE		 482void l2cap_chan_set_defaults(struct l2cap_chan *chan)
483{
484 chan->fcs = L2CAP_FCS_CRC16;
485 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
486 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
487 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
c20f8e35 488 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653
AE		 489 chan->sec_level = BT_SECURITY_LOW;
490
491 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
492}
493
93c3e8f5 494void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 495{
af05b30b 496 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 497 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 498
9f5a0d7b 499 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 500
8c1d787b 501 chan->conn = conn;
0139418c 502
5491120e
AE		 503 switch (chan->chan_type) {
504 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b
VT		 505 if (conn->hcon->type == LE_LINK) {
506 /* LE connection */
6fcb06a2 507 chan->omtu = L2CAP_DEFAULT_MTU;
fe4128e0
GP		 508 chan->scid = L2CAP_CID_LE_DATA;
509 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 510 } else {
511 /* Alloc CID for connection-oriented socket */
fe4128e0 512 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 513 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 514 }
5491120e
AE		 515 break;
516
517 case L2CAP_CHAN_CONN_LESS:
0139418c 518 /* Connectionless socket */
fe4128e0
GP		 519 chan->scid = L2CAP_CID_CONN_LESS;
520 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 521 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 522 break;
523
416fa752
AE		 524 case L2CAP_CHAN_CONN_FIX_A2MP:
525 chan->scid = L2CAP_CID_A2MP;
526 chan->dcid = L2CAP_CID_A2MP;
527 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
528 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
529 break;
530
5491120e 531 default:
0139418c 532 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 533 chan->scid = L2CAP_CID_SIGNALING;
534 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 535 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 536 }
537
8f7975b1
AE		 538 chan->local_id = L2CAP_BESTEFFORT_ID;
539 chan->local_stype = L2CAP_SERV_BESTEFFORT;
540 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
541 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
542 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 543 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 544
371fd835 545 l2cap_chan_hold(chan);
baa7e1fa 546
3df91ea2 547 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 548}
549
466f8004 550void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 551{
552 mutex_lock(&conn->chan_lock);
553 __l2cap_chan_add(conn, chan);
3df91ea2 554 mutex_unlock(&conn->chan_lock);
0139418c
MH		 555}
556
466f8004 557void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 558{
8c1d787b 559 struct l2cap_conn *conn = chan->conn;
0139418c 560
c9b66675 561 __clear_chan_timer(chan);
0139418c 562
49208c9c 563 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 564
8e87d142 565 if (conn) {
56f60984 566 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 567 /* Delete from channel list */
3df91ea2 568 list_del(&chan->list);
3d57dc68 569
371fd835 570 l2cap_chan_put(chan);
baa7e1fa 571
8c1d787b 572 chan->conn = NULL;
3cabbfda
AE		 573
574 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
575 hci_conn_put(conn->hcon);
56f60984
AE		 576
577 if (mgr && mgr->bredr_chan == chan)
578 mgr->bredr_chan = NULL;
0139418c
MH		 579 }
580
419e08c1
AE		 581 if (chan->hs_hchan) {
582 struct hci_chan *hs_hchan = chan->hs_hchan;
583
584 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
585 amp_disconnect_logical_link(hs_hchan);
586 }
587
b699ec0d 588 chan->ops->teardown(chan, err);
6be36555 589
2827011f 590 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 591 return;
2ead70b8 592
ee556f66
GP		 593 switch(chan->mode) {
594 case L2CAP_MODE_BASIC:
595 break;
c13ffa62 596
ee556f66 597 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 598 __clear_retrans_timer(chan);
599 __clear_monitor_timer(chan);
600 __clear_ack_timer(chan);
c13ffa62 601
f1c6775b 602 skb_queue_purge(&chan->srej_q);
c13ffa62 603
3c588192
MM		 604 l2cap_seq_list_free(&chan->srej_list);
605 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 606
607 /* fall through */
608
609 case L2CAP_MODE_STREAMING:
610 skb_queue_purge(&chan->tx_q);
611 break;
c13ffa62 612 }
ee556f66
GP		 613
614 return;
0139418c
MH		 615}
616
0f852724 617void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 618{
619 struct l2cap_conn *conn = chan->conn;
620 struct sock *sk = chan->sk;
621
2d792818
GP		 622 BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state),
623 sk);
4519de9a 624
89bc500e 625 switch (chan->state) {
4519de9a 626 case BT_LISTEN:
b699ec0d 627 chan->ops->teardown(chan, 0);
4519de9a
GP		 628 break;
629
630 case BT_CONNECTED:
631 case BT_CONFIG:
715ec005 632 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 633 conn->hcon->type == ACL_LINK) {
c9b66675 634 __set_chan_timer(chan, sk->sk_sndtimeo);
4519de9a
GP		 635 l2cap_send_disconn_req(conn, chan, reason);
636 } else
637 l2cap_chan_del(chan, reason);
638 break;
639
640 case BT_CONNECT2:
715ec005 641 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 642 conn->hcon->type == ACL_LINK) {
4519de9a
GP		 643 struct l2cap_conn_rsp rsp;
644 __u16 result;
645
c5daa683 646 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
4519de9a
GP		 647 result = L2CAP_CR_SEC_BLOCK;
648 else
649 result = L2CAP_CR_BAD_PSM;
89bc500e 650 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 651
652 rsp.scid = cpu_to_le16(chan->dcid);
653 rsp.dcid = cpu_to_le16(chan->scid);
654 rsp.result = cpu_to_le16(result);
ac73498c 655 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4519de9a 656 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 657 sizeof(rsp), &rsp);
4519de9a
GP		 658 }
659
660 l2cap_chan_del(chan, reason);
661 break;
662
663 case BT_CONNECT:
664 case BT_DISCONN:
665 l2cap_chan_del(chan, reason);
666 break;
667
668 default:
b699ec0d 669 chan->ops->teardown(chan, 0);
4519de9a
GP		 670 break;
671 }
672}
673
4343478f 674static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 675{
715ec005 676 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 677 switch (chan->sec_level) {
8556edd3
JH		 678 case BT_SECURITY_HIGH:
679 return HCI_AT_DEDICATED_BONDING_MITM;
680 case BT_SECURITY_MEDIUM:
681 return HCI_AT_DEDICATED_BONDING;
682 default:
683 return HCI_AT_NO_BONDING;
684 }
2983fd68 685 } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
4343478f
GP		 686 if (chan->sec_level == BT_SECURITY_LOW)
687 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 688
4343478f 689 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 690 return HCI_AT_NO_BONDING_MITM;
00ae4af9 691 else
8556edd3 692 return HCI_AT_NO_BONDING;
00ae4af9 693 } else {
4343478f 694 switch (chan->sec_level) {
00ae4af9 695 case BT_SECURITY_HIGH:
8556edd3 696 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 697 case BT_SECURITY_MEDIUM:
8556edd3 698 return HCI_AT_GENERAL_BONDING;
00ae4af9 699 default:
8556edd3 700 return HCI_AT_NO_BONDING;
00ae4af9 701 }
0684e5f9 702 }
8556edd3
JH		 703}
704
705/* Service level security */
d45fc423 706int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 707{
8c1d787b 708 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 709 __u8 auth_type;
710
4343478f 711 auth_type = l2cap_get_auth_type(chan);
79d554a6 712
4343478f 713 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 714}
715
b5ad8b7f 716static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 717{
718 u8 id;
719
720 /* Get next available identificator.
721 * 1 - 128 are used by kernel.
722 * 129 - 199 are reserved.
723 * 200 - 254 are used by utilities like l2ping, etc.
724 */
725
333055f2 726 spin_lock(&conn->lock);
4e8402a3
MH		 727
728 if (++conn->tx_ident > 128)
729 conn->tx_ident = 1;
730
731 id = conn->tx_ident;
732
333055f2 733 spin_unlock(&conn->lock);
4e8402a3
MH		 734
735 return id;
736}
737
2d792818
GP		 738static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
739 void *data)
4e8402a3
MH		 740{
741 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 742 u8 flags;
4e8402a3
MH		 743
744 BT_DBG("code 0x%2.2x", code);
745
746 if (!skb)
9a9c6a34 747 return;
4e8402a3 748
e702112f
AE		 749 if (lmp_no_flush_capable(conn->hcon->hdev))
750 flags = ACL_START_NO_FLUSH;
751 else
752 flags = ACL_START;
753
14b12d0b 754 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 755 skb->priority = HCI_PRIO_MAX;
14b12d0b 756
73d80deb
LAD		 757 hci_send_acl(conn->hchan, skb, flags);
758}
759
02b0fbb9
MM		 760static bool __chan_is_moving(struct l2cap_chan *chan)
761{
762 return chan->move_state != L2CAP_MOVE_STABLE &&
763 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
764}
765
73d80deb
LAD		 766static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
767{
768 struct hci_conn *hcon = chan->conn->hcon;
769 u16 flags;
770
771 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 772 skb->priority);
73d80deb 773
d5f8a75d
MM		 774 if (chan->hs_hcon && !__chan_is_moving(chan)) {
775 if (chan->hs_hchan)
776 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
777 else
778 kfree_skb(skb);
779
780 return;
781 }
782
73d80deb 783 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 784 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 785 flags = ACL_START_NO_FLUSH;
786 else
787 flags = ACL_START;
14b12d0b 788
73d80deb
LAD		 789 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
790 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 791}
792
b76bbd66
MM		 793static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
794{
795 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
796 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
797
798 if (enh & L2CAP_CTRL_FRAME_TYPE) {
799 /* S-Frame */
800 control->sframe = 1;
801 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
802 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
803
804 control->sar = 0;
805 control->txseq = 0;
806 } else {
807 /* I-Frame */
808 control->sframe = 0;
809 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
810 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
811
812 control->poll = 0;
813 control->super = 0;
814 }
815}
816
b76bbd66
MM		 817static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
818{
819 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
820 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
821
822 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
823 /* S-Frame */
824 control->sframe = 1;
825 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
826 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
827
828 control->sar = 0;
829 control->txseq = 0;
830 } else {
831 /* I-Frame */
832 control->sframe = 0;
833 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
834 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
835
836 control->poll = 0;
837 control->super = 0;
838 }
839}
840
841static inline void __unpack_control(struct l2cap_chan *chan,
842 struct sk_buff *skb)
843{
844 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
845 __unpack_extended_control(get_unaligned_le32(skb->data),
846 &bt_cb(skb)->control);
cec8ab6e 847 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 848 } else {
849 __unpack_enhanced_control(get_unaligned_le16(skb->data),
850 &bt_cb(skb)->control);
cec8ab6e 851 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 852 }
853}
854
b5c6aaed
MM		 855static u32 __pack_extended_control(struct l2cap_ctrl *control)
856{
857 u32 packed;
858
859 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
860 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
861
862 if (control->sframe) {
863 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
864 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
865 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
866 } else {
867 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
868 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
869 }
870
871 return packed;
872}
873
874static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
875{
876 u16 packed;
877
878 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
879 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
880
881 if (control->sframe) {
882 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
883 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
884 packed |= L2CAP_CTRL_FRAME_TYPE;
885 } else {
886 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
887 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
888 }
889
890 return packed;
891}
892
b76bbd66
MM		 893static inline void __pack_control(struct l2cap_chan *chan,
894 struct l2cap_ctrl *control,
895 struct sk_buff *skb)
896{
897 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
898 put_unaligned_le32(__pack_extended_control(control),
899 skb->data + L2CAP_HDR_SIZE);
900 } else {
901 put_unaligned_le16(__pack_enhanced_control(control),
902 skb->data + L2CAP_HDR_SIZE);
903 }
904}
905
ba7aa64f
GP		 906static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
907{
908 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
909 return L2CAP_EXT_HDR_SIZE;
910 else
911 return L2CAP_ENH_HDR_SIZE;
912}
913
a67d7f6f
MM		 914static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
915 u32 control)
b5c6aaed
MM		 916{
917 struct sk_buff *skb;
918 struct l2cap_hdr *lh;
ba7aa64f 919 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 920
921 if (chan->fcs == L2CAP_FCS_CRC16)
922 hlen += L2CAP_FCS_SIZE;
923
a67d7f6f 924 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 925
b5c6aaed 926 if (!skb)
a67d7f6f 927 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 928
929 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
930 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
931 lh->cid = cpu_to_le16(chan->dcid);
932
a67d7f6f
MM		 933 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
934 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
935 else
936 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 937
938 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 939 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 940 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
941 }
942
943 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 944 return skb;
945}
946
947static void l2cap_send_sframe(struct l2cap_chan *chan,
948 struct l2cap_ctrl *control)
949{
950 struct sk_buff *skb;
951 u32 control_field;
952
953 BT_DBG("chan %p, control %p", chan, control);
954
955 if (!control->sframe)
956 return;
957
b99e13ad
MM		 958 if (__chan_is_moving(chan))
959 return;
960
a67d7f6f
MM		 961 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
962 !control->poll)
963 control->final = 1;
964
965 if (control->super == L2CAP_SUPER_RR)
966 clear_bit(CONN_RNR_SENT, &chan->conn_state);
967 else if (control->super == L2CAP_SUPER_RNR)
968 set_bit(CONN_RNR_SENT, &chan->conn_state);
969
970 if (control->super != L2CAP_SUPER_SREJ) {
971 chan->last_acked_seq = control->reqseq;
972 __clear_ack_timer(chan);
973 }
974
975 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
976 control->final, control->poll, control->super);
977
978 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
979 control_field = __pack_extended_control(control);
980 else
981 control_field = __pack_enhanced_control(control);
982
983 skb = l2cap_create_sframe_pdu(chan, control_field);
984 if (!IS_ERR(skb))
985 l2cap_do_send(chan, skb);
b5c6aaed
MM		 986}
987
c9e3d5e0 988static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 989{
c9e3d5e0
MM		 990 struct l2cap_ctrl control;
991
992 BT_DBG("chan %p, poll %d", chan, poll);
993
994 memset(&control, 0, sizeof(control));
995 control.sframe = 1;
996 control.poll = poll;
997
998 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
999 control.super = L2CAP_SUPER_RNR;
1000 else
1001 control.super = L2CAP_SUPER_RR;
b5c6aaed 1002
c9e3d5e0
MM		 1003 control.reqseq = chan->buffer_seq;
1004 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1005}
1006
b4450035 1007static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1008{
c1360a1c 1009 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1010}
1011
93c3e8f5
AE		 1012static bool __amp_capable(struct l2cap_chan *chan)
1013{
1014 struct l2cap_conn *conn = chan->conn;
1015
1016 if (enable_hs &&
1017 chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED &&
1018 conn->fixed_chan_mask & L2CAP_FC_A2MP)
1019 return true;
1020 else
1021 return false;
1022}
1023
5ce66b59
AE		 1024static bool l2cap_check_efs(struct l2cap_chan *chan)
1025{
1026 /* Check EFS parameters */
1027 return true;
1028}
1029
2766be48 1030void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1031{
1032 struct l2cap_conn *conn = chan->conn;
1033 struct l2cap_conn_req req;
1034
1035 req.scid = cpu_to_le16(chan->scid);
1036 req.psm = chan->psm;
1037
1038 chan->ident = l2cap_get_ident(conn);
1039
1040 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1041
1042 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1043}
1044
8eb200bd
MM		 1045static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1046{
1047 struct l2cap_create_chan_req req;
1048 req.scid = cpu_to_le16(chan->scid);
1049 req.psm = chan->psm;
1050 req.amp_id = amp_id;
1051
1052 chan->ident = l2cap_get_ident(chan->conn);
1053
1054 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1055 sizeof(req), &req);
1056}
1057
02b0fbb9
MM		 1058static void l2cap_move_setup(struct l2cap_chan *chan)
1059{
1060 struct sk_buff *skb;
1061
1062 BT_DBG("chan %p", chan);
1063
1064 if (chan->mode != L2CAP_MODE_ERTM)
1065 return;
1066
1067 __clear_retrans_timer(chan);
1068 __clear_monitor_timer(chan);
1069 __clear_ack_timer(chan);
1070
1071 chan->retry_count = 0;
1072 skb_queue_walk(&chan->tx_q, skb) {
1073 if (bt_cb(skb)->control.retries)
1074 bt_cb(skb)->control.retries = 1;
1075 else
1076 break;
1077 }
1078
1079 chan->expected_tx_seq = chan->buffer_seq;
1080
1081 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1082 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1083 l2cap_seq_list_clear(&chan->retrans_list);
1084 l2cap_seq_list_clear(&chan->srej_list);
1085 skb_queue_purge(&chan->srej_q);
1086
1087 chan->tx_state = L2CAP_TX_STATE_XMIT;
1088 chan->rx_state = L2CAP_RX_STATE_MOVE;
1089
1090 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1091}
1092
5f3847a4
MM		 1093static void l2cap_move_done(struct l2cap_chan *chan)
1094{
1095 u8 move_role = chan->move_role;
1096 BT_DBG("chan %p", chan);
1097
1098 chan->move_state = L2CAP_MOVE_STABLE;
1099 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1100
1101 if (chan->mode != L2CAP_MODE_ERTM)
1102 return;
1103
1104 switch (move_role) {
1105 case L2CAP_MOVE_ROLE_INITIATOR:
1106 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1107 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1108 break;
1109 case L2CAP_MOVE_ROLE_RESPONDER:
1110 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1111 break;
1112 }
1113}
1114
9f0caeb1
VCG		 1115static void l2cap_chan_ready(struct l2cap_chan *chan)
1116{
2827011f 1117 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1118 chan->conf_state = 0;
1119 __clear_chan_timer(chan);
1120
54a59aa2 1121 chan->state = BT_CONNECTED;
9f0caeb1 1122
fd83e2c2 1123 chan->ops->ready(chan);
9f0caeb1
VCG		 1124}
1125
93c3e8f5
AE		 1126static void l2cap_start_connection(struct l2cap_chan *chan)
1127{
1128 if (__amp_capable(chan)) {
1129 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1130 a2mp_discover_amp(chan);
1131 } else {
1132 l2cap_send_conn_req(chan);
1133 }
1134}
1135
fc7f8a7e 1136static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1137{
8c1d787b 1138 struct l2cap_conn *conn = chan->conn;
79d554a6 1139
9f0caeb1
VCG		 1140 if (conn->hcon->type == LE_LINK) {
1141 l2cap_chan_ready(chan);
1142 return;
1143 }
1144
79d554a6 1145 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1146 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1147 return;
1148
d45fc423 1149 if (l2cap_chan_check_security(chan) &&
2d792818 1150 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1151 l2cap_start_connection(chan);
1152 }
79d554a6
MH		 1153 } else {
1154 struct l2cap_info_req req;
ac73498c 1155 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1156
1157 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1158 conn->info_ident = l2cap_get_ident(conn);
1159
ba13ccd9 1160 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1161
2d792818
GP		 1162 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1163 sizeof(req), &req);
79d554a6
MH		 1164 }
1165}
1166
cf6c2c0b
GP		 1167static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1168{
1169 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1170 if (!disable_ertm)
cf6c2c0b
GP		 1171 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1172
1173 switch (mode) {
1174 case L2CAP_MODE_ERTM:
1175 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1176 case L2CAP_MODE_STREAMING:
1177 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1178 default:
1179 return 0x00;
1180 }
1181}
1182
2d792818
GP		 1183static void l2cap_send_disconn_req(struct l2cap_conn *conn,
1184 struct l2cap_chan *chan, int err)
22121fc9 1185{
6be36555 1186 struct sock *sk = chan->sk;
22121fc9
GP		 1187 struct l2cap_disconn_req req;
1188
c13ffa62
GP		 1189 if (!conn)
1190 return;
1191
aad3d0e3 1192 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1193 __clear_retrans_timer(chan);
1194 __clear_monitor_timer(chan);
1195 __clear_ack_timer(chan);
c13ffa62
GP		 1196 }
1197
416fa752 1198 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
d117773c 1199 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1200 return;
1201 }
1202
fe4128e0
GP		 1203 req.dcid = cpu_to_le16(chan->dcid);
1204 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1205 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1206 sizeof(req), &req);
c13ffa62 1207
6be36555 1208 lock_sock(sk);
0e587be7 1209 __l2cap_state_change(chan, BT_DISCONN);
2e0052e4 1210 __l2cap_chan_set_err(chan, err);
6be36555 1211 release_sock(sk);
22121fc9
GP		 1212}
1213
1da177e4 1214/* ---- L2CAP connections ---- */
4e8402a3
MH		 1215static void l2cap_conn_start(struct l2cap_conn *conn)
1216{
3df91ea2 1217 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1218
1219 BT_DBG("conn %p", conn);
1220
3df91ea2 1221 mutex_lock(&conn->chan_lock);
4e8402a3 1222
3df91ea2 1223 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 1224 struct sock *sk = chan->sk;
baa7e1fa 1225
6be36555 1226 l2cap_chan_lock(chan);
4e8402a3 1227
715ec005 1228 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1229 l2cap_chan_unlock(chan);
79d554a6
MH		 1230 continue;
1231 }
1232
89bc500e 1233 if (chan->state == BT_CONNECT) {
d45fc423 1234 if (!l2cap_chan_check_security(chan) ||
2d792818 1235 !__l2cap_no_conn_pending(chan)) {
6be36555 1236 l2cap_chan_unlock(chan);
47731de7
GP		 1237 continue;
1238 }
79d554a6 1239
c1360a1c 1240 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1241 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1242 &chan->conf_state)) {
89bc500e 1243 l2cap_chan_close(chan, ECONNRESET);
6be36555 1244 l2cap_chan_unlock(chan);
47731de7 1245 continue;
b1235d79 1246 }
47731de7 1247
93c3e8f5 1248 l2cap_start_connection(chan);
47731de7 1249
89bc500e 1250 } else if (chan->state == BT_CONNECT2) {
79d554a6 1251 struct l2cap_conn_rsp rsp;
e9aeb2dd 1252 char buf[128];
fe4128e0
GP		 1253 rsp.scid = cpu_to_le16(chan->dcid);
1254 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1255
d45fc423 1256 if (l2cap_chan_check_security(chan)) {
6be36555 1257 lock_sock(sk);
c5daa683
GP		 1258 if (test_bit(BT_SK_DEFER_SETUP,
1259 &bt_sk(sk)->flags)) {
ac73498c
AE		 1260 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1261 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1262 chan->ops->defer(chan);
f66dc81f
MH		 1263
1264 } else {
0e587be7 1265 __l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1266 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1267 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1268 }
6be36555 1269 release_sock(sk);
79d554a6 1270 } else {
ac73498c
AE		 1271 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1272 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1273 }
1274
fc7f8a7e 1275 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1276 sizeof(rsp), &rsp);
e9aeb2dd 1277
c1360a1c 1278 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1279 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1280 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1281 continue;
1282 }
1283
c1360a1c 1284 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1285 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1286 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1287 chan->num_conf_req++;
4e8402a3
MH		 1288 }
1289
6be36555 1290 l2cap_chan_unlock(chan);
4e8402a3
MH		 1291 }
1292
3df91ea2 1293 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1294}
1295
c2287681 1296/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1297 * Returns closest match, locked.
1298 */
d9b88702 1299static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1300 bdaddr_t *src,
1301 bdaddr_t *dst)
b62f328b 1302{
23691d75 1303 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1304
23691d75 1305 read_lock(&chan_list_lock);
b62f328b 1306
23691d75
GP		 1307 list_for_each_entry(c, &chan_list, global_l) {
1308 struct sock *sk = c->sk;
fe4128e0 1309
89bc500e 1310 if (state && c->state != state)
b62f328b
VT		 1311 continue;
1312
23691d75 1313 if (c->scid == cid) {
c2287681
IY		 1314 int src_match, dst_match;
1315 int src_any, dst_any;
1316
b62f328b 1317 /* Exact match. */
c2287681
IY		 1318 src_match = !bacmp(&bt_sk(sk)->src, src);
1319 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1320 if (src_match && dst_match) {
23691d75
GP		 1321 read_unlock(&chan_list_lock);
1322 return c;
1323 }
b62f328b
VT		 1324
1325 /* Closest match */
c2287681
IY		 1326 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1327 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1328 if ((src_match && dst_any) || (src_any && dst_match) ||
1329 (src_any && dst_any))
23691d75 1330 c1 = c;
b62f328b
VT		 1331 }
1332 }
280f294f 1333
23691d75 1334 read_unlock(&chan_list_lock);
b62f328b 1335
23691d75 1336 return c1;
b62f328b
VT		 1337}
1338
1339static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1340{
c916fbe4 1341 struct sock *parent, *sk;
23691d75 1342 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 1343
1344 BT_DBG("");
1345
1346 /* Check if we have socket listening on cid */
23691d75 1347 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
c2287681 1348 conn->src, conn->dst);
23691d75 1349 if (!pchan)
b62f328b
VT		 1350 return;
1351
23691d75
GP		 1352 parent = pchan->sk;
1353
aa2ac881 1354 lock_sock(parent);
62f3a2cf 1355
80b98027 1356 chan = pchan->ops->new_connection(pchan);
80808e43 1357 if (!chan)
b62f328b
VT		 1358 goto clean;
1359
80808e43 1360 sk = chan->sk;
5d41ce1d 1361
b62f328b 1362 hci_conn_hold(conn->hcon);
a9ea3ed9 1363 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
b62f328b 1364
b62f328b
VT		 1365 bacpy(&bt_sk(sk)->src, conn->src);
1366 bacpy(&bt_sk(sk)->dst, conn->dst);
1367
3d57dc68 1368 l2cap_chan_add(conn, chan);
48454079 1369
6754e0df 1370 l2cap_chan_ready(chan);
b62f328b 1371
b62f328b 1372clean:
aa2ac881 1373 release_sock(parent);
b62f328b
VT		 1374}
1375
4e8402a3
MH		 1376static void l2cap_conn_ready(struct l2cap_conn *conn)
1377{
48454079 1378 struct l2cap_chan *chan;
cc110922 1379 struct hci_conn *hcon = conn->hcon;
4e8402a3 1380
79d554a6 1381 BT_DBG("conn %p", conn);
4e8402a3 1382
cc110922 1383 if (!hcon->out && hcon->type == LE_LINK)
b62f328b
VT		 1384 l2cap_le_conn_ready(conn);
1385
cc110922
VCG		 1386 if (hcon->out && hcon->type == LE_LINK)
1387 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1388
3df91ea2 1389 mutex_lock(&conn->chan_lock);
4e8402a3 1390
3df91ea2 1391 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1392
6be36555 1393 l2cap_chan_lock(chan);
4e8402a3 1394
416fa752
AE		 1395 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1396 l2cap_chan_unlock(chan);
1397 continue;
1398 }
1399
cc110922
VCG		 1400 if (hcon->type == LE_LINK) {
1401 if (smp_conn_security(hcon, chan->sec_level))
cf4cd009 1402 l2cap_chan_ready(chan);
acd7d370 1403
63128451 1404 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1405 struct sock *sk = chan->sk;
c9b66675 1406 __clear_chan_timer(chan);
6be36555 1407 lock_sock(sk);
0e587be7 1408 __l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1409 sk->sk_state_change(sk);
6be36555 1410 release_sock(sk);
b501d6a1 1411
89bc500e 1412 } else if (chan->state == BT_CONNECT)
fc7f8a7e 1413 l2cap_do_start(chan);
4e8402a3 1414
6be36555 1415 l2cap_chan_unlock(chan);
4e8402a3 1416 }
79d554a6 1417
3df91ea2 1418 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1419}
1420
1421/* Notify sockets that we cannot guaranty reliability anymore */
1422static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1423{
48454079 1424 struct l2cap_chan *chan;
4e8402a3
MH		 1425
1426 BT_DBG("conn %p", conn);
1427
3df91ea2 1428 mutex_lock(&conn->chan_lock);
4e8402a3 1429
3df91ea2 1430 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1431 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1432 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1433 }
1434
3df91ea2 1435 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1436}
1437
f878fcad 1438static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1439{
f878fcad 1440 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1441 info_timer.work);
4e8402a3 1442
984947dc 1443 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1444 conn->info_ident = 0;
984947dc 1445
4e8402a3
MH		 1446 l2cap_conn_start(conn);
1447}
1448
5d3de7df
VCG		 1449static void l2cap_conn_del(struct hci_conn *hcon, int err)
1450{
1451 struct l2cap_conn *conn = hcon->l2cap_data;
1452 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1453
1454 if (!conn)
1455 return;
1456
1457 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1458
1459 kfree_skb(conn->rx_skb);
1460
3df91ea2
AE		 1461 mutex_lock(&conn->chan_lock);
1462
5d3de7df
VCG		 1463 /* Kill channels */
1464 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1465 l2cap_chan_hold(chan);
6be36555
AE		 1466 l2cap_chan_lock(chan);
1467
5d3de7df 1468 l2cap_chan_del(chan, err);
6be36555
AE		 1469
1470 l2cap_chan_unlock(chan);
1471
80b98027 1472 chan->ops->close(chan);
61d6ef3e 1473 l2cap_chan_put(chan);
5d3de7df
VCG		 1474 }
1475
3df91ea2
AE		 1476 mutex_unlock(&conn->chan_lock);
1477
73d80deb
LAD		 1478 hci_chan_del(conn->hchan);
1479
5d3de7df 1480 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1481 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1482
51a8efd7 1483 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1484 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1485 smp_chan_destroy(conn);
d26a2345 1486 }
5d3de7df
VCG		 1487
1488 hcon->l2cap_data = NULL;
1489 kfree(conn);
1490}
1491
6c9d42a1 1492static void security_timeout(struct work_struct *work)
5d3de7df 1493{
6c9d42a1 1494 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1495 security_timer.work);
5d3de7df 1496
d06cc416
JH		 1497 BT_DBG("conn %p", conn);
1498
1499 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1500 smp_chan_destroy(conn);
1501 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1502 }
5d3de7df
VCG		 1503}
1504
1da177e4
LT		 1505static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1506{
0139418c 1507 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1508 struct hci_chan *hchan;
1da177e4 1509
0139418c 1510 if (conn || status)
1da177e4
LT		 1511 return conn;
1512
73d80deb
LAD		 1513 hchan = hci_chan_create(hcon);
1514 if (!hchan)
1515 return NULL;
1516
8bcde1f2 1517 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
73d80deb
LAD		 1518 if (!conn) {
1519 hci_chan_del(hchan);
1da177e4 1520 return NULL;
73d80deb 1521 }
1da177e4
LT		 1522
1523 hcon->l2cap_data = conn;
1524 conn->hcon = hcon;
73d80deb 1525 conn->hchan = hchan;
1da177e4 1526
73d80deb 1527 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1528
dcc042d5
AE		 1529 switch (hcon->type) {
1530 case AMP_LINK:
1531 conn->mtu = hcon->hdev->block_mtu;
1532 break;
1533
1534 case LE_LINK:
1535 if (hcon->hdev->le_mtu) {
1536 conn->mtu = hcon->hdev->le_mtu;
1537 break;
1538 }
1539 /* fall through */
1540
1541 default:
acd7d370 1542 conn->mtu = hcon->hdev->acl_mtu;
dcc042d5
AE		 1543 break;
1544 }
acd7d370 1545
1da177e4
LT		 1546 conn->src = &hcon->hdev->bdaddr;
1547 conn->dst = &hcon->dst;
1548
4e8402a3
MH		 1549 conn->feat_mask = 0;
1550
1da177e4 1551 spin_lock_init(&conn->lock);
3df91ea2 1552 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1553
1554 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1555
5d3de7df 1556 if (hcon->type == LE_LINK)
6c9d42a1 1557 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1558 else
030013d8 1559 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1560
9f5a0d7b 1561 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1562
1da177e4
LT		 1563 return conn;
1564}
1565
1da177e4 1566/* ---- Socket interface ---- */
1da177e4 1567
c2287681 1568/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1569 * Returns closest match.
1570 */
c2287681
IY		 1571static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1572 bdaddr_t *src,
1573 bdaddr_t *dst)
1da177e4 1574{
23691d75 1575 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1576
23691d75 1577 read_lock(&chan_list_lock);
e0f0cb56 1578
23691d75
GP		 1579 list_for_each_entry(c, &chan_list, global_l) {
1580 struct sock *sk = c->sk;
fe4128e0 1581
89bc500e 1582 if (state && c->state != state)
1da177e4
LT		 1583 continue;
1584
23691d75 1585 if (c->psm == psm) {
c2287681
IY		 1586 int src_match, dst_match;
1587 int src_any, dst_any;
1588
1da177e4 1589 /* Exact match. */
c2287681
IY		 1590 src_match = !bacmp(&bt_sk(sk)->src, src);
1591 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1592 if (src_match && dst_match) {
a7567b20 1593 read_unlock(&chan_list_lock);
23691d75
GP		 1594 return c;
1595 }
1da177e4
LT		 1596
1597 /* Closest match */
c2287681
IY		 1598 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1599 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1600 if ((src_match && dst_any) || (src_any && dst_match) ||
1601 (src_any && dst_any))
23691d75 1602 c1 = c;
1da177e4
LT		 1603 }
1604 }
1da177e4 1605
23691d75 1606 read_unlock(&chan_list_lock);
e0f0cb56 1607
23691d75 1608 return c1;
1da177e4
LT		 1609}
1610
8e9f9892
AG		 1611int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1612 bdaddr_t *dst, u8 dst_type)
1da177e4 1613{
5d41ce1d 1614 struct sock *sk = chan->sk;
1da177e4 1615 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1616 struct l2cap_conn *conn;
1617 struct hci_conn *hcon;
1618 struct hci_dev *hdev;
09ab6f4c 1619 __u8 auth_type;
44d0e48e 1620 int err;
1da177e4 1621
6ed93dc6 1622 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst,
ab19516a 1623 dst_type, __le16_to_cpu(psm));
1da177e4 1624
af05b30b
GP		 1625 hdev = hci_get_route(dst, src);
1626 if (!hdev)
1da177e4
LT		 1627 return -EHOSTUNREACH;
1628
09fd0de5 1629 hci_dev_lock(hdev);
1da177e4 1630
6be36555 1631 l2cap_chan_lock(chan);
03a00194
GP		 1632
1633 /* PSM must be odd and lsb of upper byte must be 0 */
1634 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
2d792818 1635 chan->chan_type != L2CAP_CHAN_RAW) {
03a00194
GP		 1636 err = -EINVAL;
1637 goto done;
1638 }
1639
1640 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1641 err = -EINVAL;
1642 goto done;
1643 }
1644
1645 switch (chan->mode) {
1646 case L2CAP_MODE_BASIC:
1647 break;
1648 case L2CAP_MODE_ERTM:
1649 case L2CAP_MODE_STREAMING:
1650 if (!disable_ertm)
1651 break;
1652 /* fall through */
1653 default:
1654 err = -ENOTSUPP;
1655 goto done;
1656 }
1657
0797e01d 1658 switch (chan->state) {
03a00194
GP		 1659 case BT_CONNECT:
1660 case BT_CONNECT2:
1661 case BT_CONFIG:
1662 /* Already connecting */
1663 err = 0;
1664 goto done;
1665
1666 case BT_CONNECTED:
1667 /* Already connected */
1668 err = -EISCONN;
1669 goto done;
1670
1671 case BT_OPEN:
1672 case BT_BOUND:
1673 /* Can connect */
1674 break;
1675
1676 default:
1677 err = -EBADFD;
1678 goto done;
1679 }
1680
1681 /* Set destination address and psm */
0797e01d 1682 lock_sock(sk);
9219b2a0 1683 bacpy(&bt_sk(sk)->dst, dst);
6be36555
AE		 1684 release_sock(sk);
1685
03a00194
GP		 1686 chan->psm = psm;
1687 chan->dcid = cid;
1da177e4 1688
4343478f 1689 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1690
fe4128e0 1691 if (chan->dcid == L2CAP_CID_LE_DATA)
8e9f9892 1692 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1693 chan->sec_level, auth_type);
acd7d370 1694 else
8e9f9892 1695 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1696 chan->sec_level, auth_type);
acd7d370 1697
30e76272
VT		 1698 if (IS_ERR(hcon)) {
1699 err = PTR_ERR(hcon);
1da177e4 1700 goto done;
30e76272 1701 }
1da177e4
LT		 1702
1703 conn = l2cap_conn_add(hcon, 0);
1704 if (!conn) {
1705 hci_conn_put(hcon);
30e76272 1706 err = -ENOMEM;
1da177e4
LT		 1707 goto done;
1708 }
1709
9f0caeb1
VCG		 1710 if (hcon->type == LE_LINK) {
1711 err = 0;
1712
1713 if (!list_empty(&conn->chan_l)) {
1714 err = -EBUSY;
1715 hci_conn_put(hcon);
1716 }
1717
1718 if (err)
1719 goto done;
1720 }
1721
1da177e4
LT		 1722 /* Update source addr of the socket */
1723 bacpy(src, conn->src);
1724
6be36555 1725 l2cap_chan_unlock(chan);
48454079 1726 l2cap_chan_add(conn, chan);
6be36555 1727 l2cap_chan_lock(chan);
48454079 1728
6be36555 1729 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1730 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1731
1732 if (hcon->state == BT_CONNECTED) {
715ec005 1733 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1734 __clear_chan_timer(chan);
d45fc423 1735 if (l2cap_chan_check_security(chan))
6be36555 1736 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1737 } else
fc7f8a7e 1738 l2cap_do_start(chan);
1da177e4
LT		 1739 }
1740
30e76272
VT		 1741 err = 0;
1742
1da177e4 1743done:
6be36555 1744 l2cap_chan_unlock(chan);
09fd0de5 1745 hci_dev_unlock(hdev);
1da177e4
LT		 1746 hci_dev_put(hdev);
1747 return err;
1748}
1749
dcba0dba 1750int __l2cap_wait_ack(struct sock *sk)
6161c038 1751{
8c1d787b 1752 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1753 DECLARE_WAITQUEUE(wait, current);
1754 int err = 0;
1755 int timeo = HZ/5;
1756
2b0b05dd 1757 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1758 set_current_state(TASK_INTERRUPTIBLE);
1759 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1760 if (!timeo)
1761 timeo = HZ/5;
1762
1763 if (signal_pending(current)) {
1764 err = sock_intr_errno(timeo);
1765 break;
1766 }
1767
1768 release_sock(sk);
1769 timeo = schedule_timeout(timeo);
1770 lock_sock(sk);
a71a0cf4 1771 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1772
1773 err = sock_error(sk);
1774 if (err)
1775 break;
1776 }
1777 set_current_state(TASK_RUNNING);
2b0b05dd 1778 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1779 return err;
1780}
1781
721c4181 1782static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1783{
721c4181 1784 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1785 monitor_timer.work);
e90bac06 1786
525cd185 1787 BT_DBG("chan %p", chan);
0e98958d 1788
6be36555
AE		 1789 l2cap_chan_lock(chan);
1790
80909e04 1791 if (!chan->conn) {
6be36555 1792 l2cap_chan_unlock(chan);
8d7e1c7f 1793 l2cap_chan_put(chan);
e90bac06
GP		 1794 return;
1795 }
1796
401bb1f7 1797 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1798
6be36555 1799 l2cap_chan_unlock(chan);
8d7e1c7f 1800 l2cap_chan_put(chan);
e90bac06
GP		 1801}
1802
721c4181 1803static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1804{
721c4181 1805 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1806 retrans_timer.work);
e90bac06 1807
49208c9c 1808 BT_DBG("chan %p", chan);
0e98958d 1809
6be36555
AE		 1810 l2cap_chan_lock(chan);
1811
80909e04
MM		 1812 if (!chan->conn) {
1813 l2cap_chan_unlock(chan);
1814 l2cap_chan_put(chan);
1815 return;
1816 }
6be36555 1817
401bb1f7 1818 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1819 l2cap_chan_unlock(chan);
8d7e1c7f 1820 l2cap_chan_put(chan);
e90bac06
GP		 1821}
1822
d660366d
GP		 1823static void l2cap_streaming_send(struct l2cap_chan *chan,
1824 struct sk_buff_head *skbs)
6840ed07 1825{
ccbb84af 1826 struct sk_buff *skb;
3733937d 1827 struct l2cap_ctrl *control;
6840ed07 1828
3733937d
MM		 1829 BT_DBG("chan %p, skbs %p", chan, skbs);
1830
b99e13ad
MM		 1831 if (__chan_is_moving(chan))
1832 return;
1833
3733937d
MM		 1834 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1835
1836 while (!skb_queue_empty(&chan->tx_q)) {
1837
1838 skb = skb_dequeue(&chan->tx_q);
1839
1840 bt_cb(skb)->control.retries = 1;
1841 control = &bt_cb(skb)->control;
1842
1843 control->reqseq = 0;
1844 control->txseq = chan->next_tx_seq;
1845
1846 __pack_control(chan, control, skb);
6840ed07 1847
47d1ec61 1848 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1849 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1850 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1851 }
1852
4343478f 1853 l2cap_do_send(chan, skb);
6840ed07 1854
b4400672 1855 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1856
836be934 1857 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1858 chan->frames_sent++;
6840ed07 1859 }
6840ed07
GP		 1860}
1861
67c9e840 1862static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1863{
1864 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1865 struct l2cap_ctrl *control;
1866 int sent = 0;
1867
1868 BT_DBG("chan %p", chan);
1c2acffb 1869
89bc500e 1870 if (chan->state != BT_CONNECTED)
c13ffa62 1871 return -ENOTCONN;
e90bac06 1872
94122bbe
MM		 1873 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1874 return 0;
1875
b99e13ad
MM		 1876 if (__chan_is_moving(chan))
1877 return 0;
1878
18a48e76
MM		 1879 while (chan->tx_send_head &&
1880 chan->unacked_frames < chan->remote_tx_win &&
1881 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1882
18a48e76 1883 skb = chan->tx_send_head;
e90bac06 1884
18a48e76
MM		 1885 bt_cb(skb)->control.retries = 1;
1886 control = &bt_cb(skb)->control;
95ffa978 1887
e2ab4353 1888 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1889 control->final = 1;
e2ab4353 1890
18a48e76
MM		 1891 control->reqseq = chan->buffer_seq;
1892 chan->last_acked_seq = chan->buffer_seq;
1893 control->txseq = chan->next_tx_seq;
1c2acffb 1894
18a48e76 1895 __pack_control(chan, control, skb);
e90bac06 1896
47d1ec61 1897 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1898 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1899 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1900 }
1901
18a48e76
MM		 1902 /* Clone after data has been modified. Data is assumed to be
1903 read-only (for locking purposes) on cloned sk_buffs.
1904 */
1905 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1906
18a48e76
MM		 1907 if (!tx_skb)
1908 break;
1c2acffb 1909
18a48e76 1910 __set_retrans_timer(chan);
836be934
AE		 1911
1912 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1913 chan->unacked_frames++;
6a026610 1914 chan->frames_sent++;
18a48e76 1915 sent++;
1c2acffb 1916
58d35f87
GP		 1917 if (skb_queue_is_last(&chan->tx_q, skb))
1918 chan->tx_send_head = NULL;
1c2acffb 1919 else
58d35f87 1920 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1921
1922 l2cap_do_send(chan, tx_skb);
b4400672 1923 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1924 }
1925
b4400672
AE		 1926 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1927 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1928
1929 return sent;
9e917af1
GP		 1930}
1931
e1fbd4c1
MM		 1932static void l2cap_ertm_resend(struct l2cap_chan *chan)
1933{
1934 struct l2cap_ctrl control;
1935 struct sk_buff *skb;
1936 struct sk_buff *tx_skb;
1937 u16 seq;
1938
1939 BT_DBG("chan %p", chan);
1940
1941 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1942 return;
1943
b99e13ad
MM		 1944 if (__chan_is_moving(chan))
1945 return;
1946
e1fbd4c1
MM		 1947 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1948 seq = l2cap_seq_list_pop(&chan->retrans_list);
1949
1950 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1951 if (!skb) {
1952 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1953 seq);
e1fbd4c1
MM		 1954 continue;
1955 }
1956
1957 bt_cb(skb)->control.retries++;
1958 control = bt_cb(skb)->control;
1959
1960 if (chan->max_tx != 0 &&
1961 bt_cb(skb)->control.retries > chan->max_tx) {
1962 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
1963 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
1964 l2cap_seq_list_clear(&chan->retrans_list);
1965 break;
1966 }
1967
1968 control.reqseq = chan->buffer_seq;
1969 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1970 control.final = 1;
1971 else
1972 control.final = 0;
1973
1974 if (skb_cloned(skb)) {
1975 /* Cloned sk_buffs are read-only, so we need a
1976 * writeable copy
1977 */
8bcde1f2 1978 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1979 } else {
8bcde1f2 1980 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1981 }
1982
1983 if (!tx_skb) {
1984 l2cap_seq_list_clear(&chan->retrans_list);
1985 break;
1986 }
1987
1988 /* Update skb contents */
1989 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1990 put_unaligned_le32(__pack_extended_control(&control),
1991 tx_skb->data + L2CAP_HDR_SIZE);
1992 } else {
1993 put_unaligned_le16(__pack_enhanced_control(&control),
1994 tx_skb->data + L2CAP_HDR_SIZE);
1995 }
1996
1997 if (chan->fcs == L2CAP_FCS_CRC16) {
1998 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
1999 put_unaligned_le16(fcs, skb_put(tx_skb,
2000 L2CAP_FCS_SIZE));
2001 }
2002
2003 l2cap_do_send(chan, tx_skb);
2004
2005 BT_DBG("Resent txseq %d", control.txseq);
2006
2007 chan->last_acked_seq = chan->buffer_seq;
2008 }
2009}
2010
f80842a8
MM		 2011static void l2cap_retransmit(struct l2cap_chan *chan,
2012 struct l2cap_ctrl *control)
2013{
2014 BT_DBG("chan %p, control %p", chan, control);
2015
2016 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2017 l2cap_ertm_resend(chan);
2018}
2019
d2a7ac5d
MM		 2020static void l2cap_retransmit_all(struct l2cap_chan *chan,
2021 struct l2cap_ctrl *control)
2022{
e1fbd4c1
MM		 2023 struct sk_buff *skb;
2024
2025 BT_DBG("chan %p, control %p", chan, control);
2026
2027 if (control->poll)
2028 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2029
2030 l2cap_seq_list_clear(&chan->retrans_list);
2031
2032 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2033 return;
2034
2035 if (chan->unacked_frames) {
2036 skb_queue_walk(&chan->tx_q, skb) {
2037 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2038 skb == chan->tx_send_head)
e1fbd4c1
MM		 2039 break;
2040 }
2041
2042 skb_queue_walk_from(&chan->tx_q, skb) {
2043 if (skb == chan->tx_send_head)
2044 break;
2045
2046 l2cap_seq_list_append(&chan->retrans_list,
2047 bt_cb(skb)->control.txseq);
2048 }
2049
2050 l2cap_ertm_resend(chan);
2051 }
d2a7ac5d
MM		 2052}
2053
0a0aba42 2054static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2055{
0a0aba42
MM		 2056 struct l2cap_ctrl control;
2057 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2058 chan->last_acked_seq);
2059 int threshold;
9e917af1 2060
0a0aba42
MM		 2061 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2062 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2063
0a0aba42
MM		 2064 memset(&control, 0, sizeof(control));
2065 control.sframe = 1;
dfc909be 2066
0a0aba42
MM		 2067 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2068 chan->rx_state == L2CAP_RX_STATE_RECV) {
2069 __clear_ack_timer(chan);
2070 control.super = L2CAP_SUPER_RNR;
2071 control.reqseq = chan->buffer_seq;
2072 l2cap_send_sframe(chan, &control);
2073 } else {
2074 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2075 l2cap_ertm_send(chan);
2076 /* If any i-frames were sent, they included an ack */
2077 if (chan->buffer_seq == chan->last_acked_seq)
2078 frames_to_ack = 0;
2079 }
dfc909be 2080
c20f8e35 2081 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2082 * Calculate without mul or div
2083 */
c20f8e35 2084 threshold = chan->ack_win;
0a0aba42
MM		 2085 threshold += threshold << 1;
2086 threshold >>= 2;
2087
b4400672 2088 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2089 threshold);
2090
2091 if (frames_to_ack >= threshold) {
2092 __clear_ack_timer(chan);
2093 control.super = L2CAP_SUPER_RR;
2094 control.reqseq = chan->buffer_seq;
2095 l2cap_send_sframe(chan, &control);
2096 frames_to_ack = 0;
2097 }
1c2acffb 2098
0a0aba42
MM		 2099 if (frames_to_ack)
2100 __set_ack_timer(chan);
2101 }
b17e73bb
SJ		 2102}
2103
04124681
GP		 2104static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2105 struct msghdr *msg, int len,
2106 int count, struct sk_buff *skb)
1c2acffb 2107{
0952a57a 2108 struct l2cap_conn *conn = chan->conn;
1c2acffb 2109 struct sk_buff **frag;
90338947 2110 int sent = 0;
1da177e4 2111
59203a21 2112 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2113 return -EFAULT;
1da177e4
LT		 2114
2115 sent += count;
2116 len -= count;
2117
2118 /* Continuation fragments (no L2CAP header) */
2119 frag = &skb_shinfo(skb)->frag_list;
2120 while (len) {
fbe00700
GP		 2121 struct sk_buff *tmp;
2122
1da177e4
LT		 2123 count = min_t(unsigned int, conn->mtu, len);
2124
fbe00700
GP		 2125 tmp = chan->ops->alloc_skb(chan, count,
2126 msg->msg_flags & MSG_DONTWAIT);
2127 if (IS_ERR(tmp))
2128 return PTR_ERR(tmp);
2129
2130 *frag = tmp;
2f7719ce 2131
1c2acffb
GP		 2132 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2133 return -EFAULT;
1da177e4 2134
5e59b791
LAD		 2135 (*frag)->priority = skb->priority;
2136
1da177e4
LT		 2137 sent += count;
2138 len -= count;
2139
2d0ed3d5
GP		 2140 skb->len += (*frag)->len;
2141 skb->data_len += (*frag)->len;
2142
1da177e4
LT		 2143 frag = &(*frag)->next;
2144 }
1da177e4
LT		 2145
2146 return sent;
1c2acffb 2147}
1da177e4 2148
5e59b791 2149static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2150 struct msghdr *msg, size_t len,
2151 u32 priority)
1c2acffb 2152{
8c1d787b 2153 struct l2cap_conn *conn = chan->conn;
1c2acffb 2154 struct sk_buff *skb;
03a51213 2155 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2156 struct l2cap_hdr *lh;
2157
b4400672 2158 BT_DBG("chan %p len %zu priority %u", chan, len, priority);
1c2acffb
GP		 2159
2160 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2161
2162 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2163 msg->msg_flags & MSG_DONTWAIT);
2164 if (IS_ERR(skb))
2165 return skb;
1c2acffb 2166
5e59b791
LAD		 2167 skb->priority = priority;
2168
1c2acffb
GP		 2169 /* Create L2CAP header */
2170 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2171 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c
AE		 2172 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2173 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2174
0952a57a 2175 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2176 if (unlikely(err < 0)) {
2177 kfree_skb(skb);
2178 return ERR_PTR(err);
2179 }
2180 return skb;
2181}
2182
5e59b791 2183static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2184 struct msghdr *msg, size_t len,
2185 u32 priority)
1c2acffb 2186{
8c1d787b 2187 struct l2cap_conn *conn = chan->conn;
1c2acffb 2188 struct sk_buff *skb;
f2ba7fae 2189 int err, count;
1c2acffb
GP		 2190 struct l2cap_hdr *lh;
2191
b4400672 2192 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2193
f2ba7fae 2194 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2195
f2ba7fae 2196 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2197 msg->msg_flags & MSG_DONTWAIT);
2198 if (IS_ERR(skb))
2199 return skb;
1c2acffb 2200
5e59b791
LAD		 2201 skb->priority = priority;
2202
1c2acffb
GP		 2203 /* Create L2CAP header */
2204 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2205 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2206 lh->len = cpu_to_le16(len);
1c2acffb 2207
0952a57a 2208 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2209 if (unlikely(err < 0)) {
2210 kfree_skb(skb);
2211 return ERR_PTR(err);
2212 }
2213 return skb;
2214}
2215
ab0ff76d 2216static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2217 struct msghdr *msg, size_t len,
2218 u16 sdulen)
1c2acffb 2219{
8c1d787b 2220 struct l2cap_conn *conn = chan->conn;
1c2acffb 2221 struct sk_buff *skb;
e4ca6d98 2222 int err, count, hlen;
1c2acffb
GP		 2223 struct l2cap_hdr *lh;
2224
b4400672 2225 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2226
0ee0d208
GP		 2227 if (!conn)
2228 return ERR_PTR(-ENOTCONN);
2229
ba7aa64f 2230 hlen = __ertm_hdr_size(chan);
e4ca6d98 2231
c74e560c 2232 if (sdulen)
03a51213 2233 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2234
47d1ec61 2235 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2236 hlen += L2CAP_FCS_SIZE;
fcc203c3 2237
1c2acffb 2238 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2239
2240 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2241 msg->msg_flags & MSG_DONTWAIT);
2242 if (IS_ERR(skb))
2243 return skb;
1c2acffb
GP		 2244
2245 /* Create L2CAP header */
2246 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2247 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2248 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2249
18a48e76
MM		 2250 /* Control header is populated later */
2251 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2252 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2253 else
2254 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2255
c74e560c 2256 if (sdulen)
03a51213 2257 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2258
0952a57a 2259 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2260 if (unlikely(err < 0)) {
2261 kfree_skb(skb);
2262 return ERR_PTR(err);
2263 }
e90bac06 2264
18a48e76 2265 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2266 bt_cb(skb)->control.retries = 0;
1c2acffb 2267 return skb;
1da177e4
LT		 2268}
2269
94122bbe
MM		 2270static int l2cap_segment_sdu(struct l2cap_chan *chan,
2271 struct sk_buff_head *seg_queue,
2272 struct msghdr *msg, size_t len)
c74e560c 2273{
c74e560c 2274 struct sk_buff *skb;
94122bbe
MM		 2275 u16 sdu_len;
2276 size_t pdu_len;
94122bbe 2277 u8 sar;
c74e560c 2278
b4400672 2279 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2280
94122bbe
MM		 2281 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2282 * so fragmented skbs are not used. The HCI layer's handling
2283 * of fragmented skbs is not compatible with ERTM's queueing.
2284 */
c74e560c 2285
94122bbe
MM		 2286 /* PDU size is derived from the HCI MTU */
2287 pdu_len = chan->conn->mtu;
c74e560c 2288
a549574d
MM		 2289 /* Constrain PDU size for BR/EDR connections */
2290 if (!chan->hs_hcon)
2291 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2292
2293 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2294 if (chan->fcs)
2295 pdu_len -= L2CAP_FCS_SIZE;
2296
ba7aa64f 2297 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2298
2299 /* Remote device may have requested smaller PDUs */
2300 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2301
2302 if (len <= pdu_len) {
2303 sar = L2CAP_SAR_UNSEGMENTED;
2304 sdu_len = 0;
2305 pdu_len = len;
2306 } else {
2307 sar = L2CAP_SAR_START;
2308 sdu_len = len;
2309 pdu_len -= L2CAP_SDULEN_SIZE;
2310 }
2311
2312 while (len > 0) {
2313 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2314
c74e560c 2315 if (IS_ERR(skb)) {
94122bbe 2316 __skb_queue_purge(seg_queue);
c74e560c
GP		 2317 return PTR_ERR(skb);
2318 }
2319
94122bbe
MM		 2320 bt_cb(skb)->control.sar = sar;
2321 __skb_queue_tail(seg_queue, skb);
2322
2323 len -= pdu_len;
2324 if (sdu_len) {
2325 sdu_len = 0;
2326 pdu_len += L2CAP_SDULEN_SIZE;
2327 }
2328
2329 if (len <= pdu_len) {
2330 sar = L2CAP_SAR_END;
2331 pdu_len = len;
2332 } else {
2333 sar = L2CAP_SAR_CONTINUE;
2334 }
c74e560c 2335 }
c74e560c 2336
f0f62799 2337 return 0;
c74e560c
GP		 2338}
2339
5e59b791 2340int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2341 u32 priority)
9a91a04a 2342{
9a91a04a 2343 struct sk_buff *skb;
9a91a04a 2344 int err;
94122bbe 2345 struct sk_buff_head seg_queue;
9a91a04a
GP		 2346
2347 /* Connectionless channel */
715ec005 2348 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2349 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2350 if (IS_ERR(skb))
2351 return PTR_ERR(skb);
2352
2353 l2cap_do_send(chan, skb);
2354 return len;
2355 }
2356
2357 switch (chan->mode) {
2358 case L2CAP_MODE_BASIC:
2359 /* Check outgoing MTU */
2360 if (len > chan->omtu)
2361 return -EMSGSIZE;
2362
2363 /* Create a basic PDU */
5e59b791 2364 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2365 if (IS_ERR(skb))
2366 return PTR_ERR(skb);
2367
2368 l2cap_do_send(chan, skb);
2369 err = len;
2370 break;
2371
2372 case L2CAP_MODE_ERTM:
2373 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2374 /* Check outgoing MTU */
2375 if (len > chan->omtu) {
2376 err = -EMSGSIZE;
2377 break;
2378 }
9a91a04a 2379
94122bbe 2380 __skb_queue_head_init(&seg_queue);
9a91a04a 2381
94122bbe
MM		 2382 /* Do segmentation before calling in to the state machine,
2383 * since it's possible to block while waiting for memory
2384 * allocation.
2385 */
2386 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2387
94122bbe
MM		 2388 /* The channel could have been closed while segmenting,
2389 * check that it is still connected.
2390 */
2391 if (chan->state != BT_CONNECTED) {
2392 __skb_queue_purge(&seg_queue);
2393 err = -ENOTCONN;
9a91a04a
GP		 2394 }
2395
94122bbe 2396 if (err)
9a91a04a 2397 break;
9a91a04a 2398
3733937d 2399 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2400 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2401 else
d660366d 2402 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2403
d660366d 2404 err = len;
9a91a04a 2405
94122bbe
MM		 2406 /* If the skbs were not queued for sending, they'll still be in
2407 * seg_queue and need to be purged.
2408 */
2409 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2410 break;
2411
2412 default:
2413 BT_DBG("bad state %1.1x", chan->mode);
2414 err = -EBADFD;
2415 }
2416
2417 return err;
2418}
2419
d2a7ac5d
MM		 2420static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2421{
bed68bde
MM		 2422 struct l2cap_ctrl control;
2423 u16 seq;
2424
b4400672 2425 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2426
2427 memset(&control, 0, sizeof(control));
2428 control.sframe = 1;
2429 control.super = L2CAP_SUPER_SREJ;
2430
2431 for (seq = chan->expected_tx_seq; seq != txseq;
2432 seq = __next_seq(chan, seq)) {
2433 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2434 control.reqseq = seq;
2435 l2cap_send_sframe(chan, &control);
2436 l2cap_seq_list_append(&chan->srej_list, seq);
2437 }
2438 }
2439
2440 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2441}
2442
2443static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2444{
bed68bde
MM		 2445 struct l2cap_ctrl control;
2446
2447 BT_DBG("chan %p", chan);
2448
2449 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2450 return;
2451
2452 memset(&control, 0, sizeof(control));
2453 control.sframe = 1;
2454 control.super = L2CAP_SUPER_SREJ;
2455 control.reqseq = chan->srej_list.tail;
2456 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2457}
2458
2459static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2460{
bed68bde
MM		 2461 struct l2cap_ctrl control;
2462 u16 initial_head;
2463 u16 seq;
2464
b4400672 2465 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2466
2467 memset(&control, 0, sizeof(control));
2468 control.sframe = 1;
2469 control.super = L2CAP_SUPER_SREJ;
2470
2471 /* Capture initial list head to allow only one pass through the list. */
2472 initial_head = chan->srej_list.head;
2473
2474 do {
2475 seq = l2cap_seq_list_pop(&chan->srej_list);
2476 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2477 break;
2478
2479 control.reqseq = seq;
2480 l2cap_send_sframe(chan, &control);
2481 l2cap_seq_list_append(&chan->srej_list, seq);
2482 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2483}
2484
608bcc6d
MM		 2485static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2486{
2487 struct sk_buff *acked_skb;
2488 u16 ackseq;
2489
b4400672 2490 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2491
2492 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2493 return;
2494
b4400672 2495 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2496 chan->expected_ack_seq, chan->unacked_frames);
2497
2498 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2499 ackseq = __next_seq(chan, ackseq)) {
2500
2501 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2502 if (acked_skb) {
2503 skb_unlink(acked_skb, &chan->tx_q);
2504 kfree_skb(acked_skb);
2505 chan->unacked_frames--;
2506 }
2507 }
2508
2509 chan->expected_ack_seq = reqseq;
2510
2511 if (chan->unacked_frames == 0)
2512 __clear_retrans_timer(chan);
2513
b4400672 2514 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2515}
2516
2517static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2518{
2519 BT_DBG("chan %p", chan);
2520
2521 chan->expected_tx_seq = chan->buffer_seq;
2522 l2cap_seq_list_clear(&chan->srej_list);
2523 skb_queue_purge(&chan->srej_q);
2524 chan->rx_state = L2CAP_RX_STATE_RECV;
2525}
2526
d660366d
GP		 2527static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2528 struct l2cap_ctrl *control,
2529 struct sk_buff_head *skbs, u8 event)
608bcc6d 2530{
608bcc6d
MM		 2531 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2532 event);
2533
2534 switch (event) {
2535 case L2CAP_EV_DATA_REQUEST:
2536 if (chan->tx_send_head == NULL)
2537 chan->tx_send_head = skb_peek(skbs);
2538
2539 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2540 l2cap_ertm_send(chan);
2541 break;
2542 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2543 BT_DBG("Enter LOCAL_BUSY");
2544 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2545
2546 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2547 /* The SREJ_SENT state must be aborted if we are to
2548 * enter the LOCAL_BUSY state.
2549 */
2550 l2cap_abort_rx_srej_sent(chan);
2551 }
2552
2553 l2cap_send_ack(chan);
2554
2555 break;
2556 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2557 BT_DBG("Exit LOCAL_BUSY");
2558 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2559
2560 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2561 struct l2cap_ctrl local_control;
2562
2563 memset(&local_control, 0, sizeof(local_control));
2564 local_control.sframe = 1;
2565 local_control.super = L2CAP_SUPER_RR;
2566 local_control.poll = 1;
2567 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2568 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2569
2570 chan->retry_count = 1;
2571 __set_monitor_timer(chan);
2572 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2573 }
2574 break;
2575 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2576 l2cap_process_reqseq(chan, control->reqseq);
2577 break;
2578 case L2CAP_EV_EXPLICIT_POLL:
2579 l2cap_send_rr_or_rnr(chan, 1);
2580 chan->retry_count = 1;
2581 __set_monitor_timer(chan);
2582 __clear_ack_timer(chan);
2583 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2584 break;
2585 case L2CAP_EV_RETRANS_TO:
2586 l2cap_send_rr_or_rnr(chan, 1);
2587 chan->retry_count = 1;
2588 __set_monitor_timer(chan);
2589 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2590 break;
2591 case L2CAP_EV_RECV_FBIT:
2592 /* Nothing to process */
2593 break;
2594 default:
2595 break;
2596 }
608bcc6d
MM		 2597}
2598
d660366d
GP		 2599static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2600 struct l2cap_ctrl *control,
2601 struct sk_buff_head *skbs, u8 event)
608bcc6d 2602{
608bcc6d
MM		 2603 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2604 event);
2605
2606 switch (event) {
2607 case L2CAP_EV_DATA_REQUEST:
2608 if (chan->tx_send_head == NULL)
2609 chan->tx_send_head = skb_peek(skbs);
2610 /* Queue data, but don't send. */
2611 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2612 break;
2613 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2614 BT_DBG("Enter LOCAL_BUSY");
2615 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2616
2617 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2618 /* The SREJ_SENT state must be aborted if we are to
2619 * enter the LOCAL_BUSY state.
2620 */
2621 l2cap_abort_rx_srej_sent(chan);
2622 }
2623
2624 l2cap_send_ack(chan);
2625
2626 break;
2627 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2628 BT_DBG("Exit LOCAL_BUSY");
2629 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2630
2631 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2632 struct l2cap_ctrl local_control;
2633 memset(&local_control, 0, sizeof(local_control));
2634 local_control.sframe = 1;
2635 local_control.super = L2CAP_SUPER_RR;
2636 local_control.poll = 1;
2637 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2638 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2639
2640 chan->retry_count = 1;
2641 __set_monitor_timer(chan);
2642 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2643 }
2644 break;
2645 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2646 l2cap_process_reqseq(chan, control->reqseq);
2647
2648 /* Fall through */
2649
2650 case L2CAP_EV_RECV_FBIT:
2651 if (control && control->final) {
2652 __clear_monitor_timer(chan);
2653 if (chan->unacked_frames > 0)
2654 __set_retrans_timer(chan);
2655 chan->retry_count = 0;
2656 chan->tx_state = L2CAP_TX_STATE_XMIT;
2657 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2658 }
2659 break;
2660 case L2CAP_EV_EXPLICIT_POLL:
2661 /* Ignore */
2662 break;
2663 case L2CAP_EV_MONITOR_TO:
2664 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2665 l2cap_send_rr_or_rnr(chan, 1);
2666 __set_monitor_timer(chan);
2667 chan->retry_count++;
2668 } else {
2669 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
2670 }
2671 break;
2672 default:
2673 break;
2674 }
608bcc6d
MM		 2675}
2676
d660366d
GP		 2677static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2678 struct sk_buff_head *skbs, u8 event)
608bcc6d 2679{
608bcc6d
MM		 2680 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2681 chan, control, skbs, event, chan->tx_state);
2682
2683 switch (chan->tx_state) {
2684 case L2CAP_TX_STATE_XMIT:
d660366d 2685 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2686 break;
2687 case L2CAP_TX_STATE_WAIT_F:
d660366d 2688 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2689 break;
2690 default:
2691 /* Ignore event */
2692 break;
2693 }
608bcc6d
MM		 2694}
2695
4b51dae9
MM		 2696static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2697 struct l2cap_ctrl *control)
2698{
2699 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2700 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2701}
2702
f80842a8
MM		 2703static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2704 struct l2cap_ctrl *control)
2705{
2706 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2707 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2708}
2709
1da177e4
LT		 2710/* Copy frame to all raw sockets on that connection */
2711static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2712{
1da177e4 2713 struct sk_buff *nskb;
48454079 2714 struct l2cap_chan *chan;
1da177e4
LT		 2715
2716 BT_DBG("conn %p", conn);
2717
3df91ea2 2718 mutex_lock(&conn->chan_lock);
3d57dc68 2719
3df91ea2 2720 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2721 struct sock *sk = chan->sk;
715ec005 2722 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2723 continue;
2724
2725 /* Don't send frame to the socket it came from */
2726 if (skb->sk == sk)
2727 continue;
8bcde1f2 2728 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2729 if (!nskb)
1da177e4
LT		 2730 continue;
2731
80b98027 2732 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2733 kfree_skb(nskb);
2734 }
3d57dc68 2735
3df91ea2 2736 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2737}
2738
2739/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2740static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2741 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2742{
2743 struct sk_buff *skb, **frag;
2744 struct l2cap_cmd_hdr *cmd;
2745 struct l2cap_hdr *lh;
2746 int len, count;
2747
b4400672
AE		 2748 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2749 conn, code, ident, dlen);
1da177e4
LT		 2750
2751 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2752 count = min_t(unsigned int, conn->mtu, len);
2753
8bcde1f2 2754 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2755 if (!skb)
2756 return NULL;
2757
2758 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2759 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2760
2761 if (conn->hcon->type == LE_LINK)
ac73498c 2762 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2763 else
ac73498c 2764 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2765
2766 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2767 cmd->code = code;
2768 cmd->ident = ident;
aca3192c 2769 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2770
2771 if (dlen) {
2772 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2773 memcpy(skb_put(skb, count), data, count);
2774 data += count;
2775 }
2776
2777 len -= skb->len;
2778
2779 /* Continuation fragments (no L2CAP header) */
2780 frag = &skb_shinfo(skb)->frag_list;
2781 while (len) {
2782 count = min_t(unsigned int, conn->mtu, len);
2783
8bcde1f2 2784 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2785 if (!*frag)
2786 goto fail;
2787
2788 memcpy(skb_put(*frag, count), data, count);
2789
2790 len -= count;
2791 data += count;
2792
2793 frag = &(*frag)->next;
2794 }
2795
2796 return skb;
2797
2798fail:
2799 kfree_skb(skb);
2800 return NULL;
2801}
2802
2d792818
GP		 2803static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2804 unsigned long *val)
1da177e4
LT		 2805{
2806 struct l2cap_conf_opt *opt = *ptr;
2807 int len;
2808
2809 len = L2CAP_CONF_OPT_SIZE + opt->len;
2810 *ptr += len;
2811
2812 *type = opt->type;
2813 *olen = opt->len;
2814
2815 switch (opt->len) {
2816 case 1:
2817 *val = *((u8 *) opt->val);
2818 break;
2819
2820 case 2:
bfaaeb3e 2821 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2822 break;
2823
2824 case 4:
bfaaeb3e 2825 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2826 break;
2827
2828 default:
2829 *val = (unsigned long) opt->val;
2830 break;
2831 }
2832
b4400672 2833 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2834 return len;
2835}
2836
1da177e4
LT		 2837static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2838{
2839 struct l2cap_conf_opt *opt = *ptr;
2840
b4400672 2841 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2842
2843 opt->type = type;
2844 opt->len = len;
2845
2846 switch (len) {
2847 case 1:
2848 *((u8 *) opt->val) = val;
2849 break;
2850
2851 case 2:
4f8b691c 2852 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2853 break;
2854
2855 case 4:
4f8b691c 2856 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2857 break;
2858
2859 default:
2860 memcpy(opt->val, (void *) val, len);
2861 break;
2862 }
2863
2864 *ptr += L2CAP_CONF_OPT_SIZE + len;
2865}
2866
f89cef09
AE		 2867static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2868{
2869 struct l2cap_conf_efs efs;
2870
1ec918ce 2871 switch (chan->mode) {
f89cef09
AE		 2872 case L2CAP_MODE_ERTM:
2873 efs.id = chan->local_id;
2874 efs.stype = chan->local_stype;
2875 efs.msdu = cpu_to_le16(chan->local_msdu);
2876 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 2877 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 2878 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 2879 break;
2880
2881 case L2CAP_MODE_STREAMING:
2882 efs.id = 1;
2883 efs.stype = L2CAP_SERV_BESTEFFORT;
2884 efs.msdu = cpu_to_le16(chan->local_msdu);
2885 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2886 efs.acc_lat = 0;
2887 efs.flush_to = 0;
2888 break;
2889
2890 default:
2891 return;
2892 }
2893
2894 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 2895 (unsigned long) &efs);
f89cef09
AE		 2896}
2897
721c4181 2898static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 2899{
721c4181 2900 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 2901 ack_timer.work);
2902 u16 frames_to_ack;
c1b4f43b 2903
2fb9b3d4
GP		 2904 BT_DBG("chan %p", chan);
2905
6be36555
AE		 2906 l2cap_chan_lock(chan);
2907
0362520b
MM		 2908 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2909 chan->last_acked_seq);
6be36555 2910
0362520b
MM		 2911 if (frames_to_ack)
2912 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 2913
0362520b 2914 l2cap_chan_unlock(chan);
09bfb2ee 2915 l2cap_chan_put(chan);
c1b4f43b
GP		 2916}
2917
466f8004 2918int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 2919{
3c588192
MM		 2920 int err;
2921
105bdf9e
MM		 2922 chan->next_tx_seq = 0;
2923 chan->expected_tx_seq = 0;
42e5c802 2924 chan->expected_ack_seq = 0;
6a026610 2925 chan->unacked_frames = 0;
42e5c802 2926 chan->buffer_seq = 0;
6a026610 2927 chan->frames_sent = 0;
105bdf9e
MM		 2928 chan->last_acked_seq = 0;
2929 chan->sdu = NULL;
2930 chan->sdu_last_frag = NULL;
2931 chan->sdu_len = 0;
2932
d34c34fb
MM		 2933 skb_queue_head_init(&chan->tx_q);
2934
08333283
MM		 2935 chan->local_amp_id = 0;
2936 chan->move_id = 0;
2937 chan->move_state = L2CAP_MOVE_STABLE;
2938 chan->move_role = L2CAP_MOVE_ROLE_NONE;
2939
105bdf9e
MM		 2940 if (chan->mode != L2CAP_MODE_ERTM)
2941 return 0;
2942
2943 chan->rx_state = L2CAP_RX_STATE_RECV;
2944 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 2945
721c4181
GP		 2946 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2947 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2948 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 2949
f1c6775b 2950 skb_queue_head_init(&chan->srej_q);
1890d36b 2951
3c588192
MM		 2952 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
2953 if (err < 0)
2954 return err;
2955
9dc9affc
MM		 2956 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
2957 if (err < 0)
2958 l2cap_seq_list_free(&chan->srej_list);
2959
2960 return err;
0565c1c2
GP		 2961}
2962
f2fcfcd6
GP		 2963static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2964{
2965 switch (mode) {
2966 case L2CAP_MODE_STREAMING:
2967 case L2CAP_MODE_ERTM:
2968 if (l2cap_mode_supported(mode, remote_feat_mask))
2969 return mode;
2970 /* fall through */
2971 default:
2972 return L2CAP_MODE_BASIC;
2973 }
2974}
2975
6327eb98
AE		 2976static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2977{
2978 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2979}
2980
f89cef09
AE		 2981static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2982{
2983 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2984}
2985
36c86c85
MM		 2986static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
2987 struct l2cap_conf_rfc *rfc)
2988{
2989 if (chan->local_amp_id && chan->hs_hcon) {
2990 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
2991
2992 /* Class 1 devices have must have ERTM timeouts
2993 * exceeding the Link Supervision Timeout. The
2994 * default Link Supervision Timeout for AMP
2995 * controllers is 10 seconds.
2996 *
2997 * Class 1 devices use 0xffffffff for their
2998 * best-effort flush timeout, so the clamping logic
2999 * will result in a timeout that meets the above
3000 * requirement. ERTM timeouts are 16-bit values, so
3001 * the maximum timeout is 65.535 seconds.
3002 */
3003
3004 /* Convert timeout to milliseconds and round */
3005 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3006
3007 /* This is the recommended formula for class 2 devices
3008 * that start ERTM timers when packets are sent to the
3009 * controller.
3010 */
3011 ertm_to = 3 * ertm_to + 500;
3012
3013 if (ertm_to > 0xffff)
3014 ertm_to = 0xffff;
3015
3016 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3017 rfc->monitor_timeout = rfc->retrans_timeout;
3018 } else {
3019 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3020 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3021 }
3022}
3023
6327eb98
AE		 3024static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3025{
3026 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
2d792818 3027 __l2cap_ews_supported(chan)) {
6327eb98
AE		 3028 /* use extended control field */
3029 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3030 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3031 } else {
6327eb98 3032 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3033 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3034 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3035 }
c20f8e35 3036 chan->ack_win = chan->tx_win;
6327eb98
AE		 3037}
3038
710f9b0a 3039static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3040{
1da177e4 3041 struct l2cap_conf_req *req = data;
0c1bc5c6 3042 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3043 void *ptr = req->data;
c8f79162 3044 u16 size;
1da177e4 3045
49208c9c 3046 BT_DBG("chan %p", chan);
1da177e4 3047
73ffa904 3048 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3049 goto done;
3050
0c1bc5c6 3051 switch (chan->mode) {
f2fcfcd6
GP		 3052 case L2CAP_MODE_STREAMING:
3053 case L2CAP_MODE_ERTM:
c1360a1c 3054 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3055 break;
85eb53c6 3056
f89cef09
AE		 3057 if (__l2cap_efs_supported(chan))
3058 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3059
2ba13ed6 3060 /* fall through */
f2fcfcd6 3061 default:
8c1d787b 3062 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3063 break;
3064 }
3065
3066done:
0c1bc5c6
GP		 3067 if (chan->imtu != L2CAP_DEFAULT_MTU)
3068 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3069
0c1bc5c6 3070 switch (chan->mode) {
65c7c491 3071 case L2CAP_MODE_BASIC:
8c1d787b 3072 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3073 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3074 break;
3075
62547752
GP		 3076 rfc.mode = L2CAP_MODE_BASIC;
3077 rfc.txwin_size = 0;
3078 rfc.max_transmit = 0;
3079 rfc.retrans_timeout = 0;
3080 rfc.monitor_timeout = 0;
3081 rfc.max_pdu_size = 0;
3082
63406504 3083 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3084 (unsigned long) &rfc);
65c7c491
MH		 3085 break;
3086
3087 case L2CAP_MODE_ERTM:
3088 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3089 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3090
3091 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3092
3093 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3094 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3095 L2CAP_FCS_SIZE);
c8f79162 3096 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3097
6327eb98
AE		 3098 l2cap_txwin_setup(chan);
3099
3100 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3101 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3102
63406504 3103 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3104 (unsigned long) &rfc);
63406504 3105
f89cef09
AE		 3106 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3107 l2cap_add_opt_efs(&ptr, chan);
3108
8c1d787b 3109 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 3110 break;
3111
47d1ec61 3112 if (chan->fcs == L2CAP_FCS_NONE ||
2d792818 3113 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 3114 chan->fcs = L2CAP_FCS_NONE;
3115 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 3116 }
6327eb98
AE		 3117
3118 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3119 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3120 chan->tx_win);
f2fcfcd6
GP		 3121 break;
3122
3123 case L2CAP_MODE_STREAMING:
273759e2 3124 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3125 rfc.mode = L2CAP_MODE_STREAMING;
3126 rfc.txwin_size = 0;
3127 rfc.max_transmit = 0;
3128 rfc.retrans_timeout = 0;
3129 rfc.monitor_timeout = 0;
c8f79162
AE		 3130
3131 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3132 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3133 L2CAP_FCS_SIZE);
c8f79162 3134 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3135
63406504 3136 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3137 (unsigned long) &rfc);
63406504 3138
f89cef09
AE		 3139 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3140 l2cap_add_opt_efs(&ptr, chan);
3141
8c1d787b 3142 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 3143 break;
3144
47d1ec61 3145 if (chan->fcs == L2CAP_FCS_NONE ||
2d792818 3146 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 3147 chan->fcs = L2CAP_FCS_NONE;
3148 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 3149 }
65c7c491
MH		 3150 break;
3151 }
1da177e4 3152
fe4128e0 3153 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3154 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3155
3156 return ptr - data;
3157}
3158
73ffa904 3159static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3160{
5dee9e7c
MH		 3161 struct l2cap_conf_rsp *rsp = data;
3162 void *ptr = rsp->data;
73ffa904
GP		 3163 void *req = chan->conf_req;
3164 int len = chan->conf_len;
5dee9e7c
MH		 3165 int type, hint, olen;
3166 unsigned long val;
6464f35f 3167 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3168 struct l2cap_conf_efs efs;
3169 u8 remote_efs = 0;
861d6882 3170 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3171 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3172 u16 size;
1da177e4 3173
73ffa904 3174 BT_DBG("chan %p", chan);
820ae1b8 3175
5dee9e7c
MH		 3176 while (len >= L2CAP_CONF_OPT_SIZE) {
3177 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3178
589d2746 3179 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3180 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3181
3182 switch (type) {
3183 case L2CAP_CONF_MTU:
861d6882 3184 mtu = val;
5dee9e7c
MH		 3185 break;
3186
3187 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3188 chan->flush_to = val;
5dee9e7c
MH		 3189 break;
3190
3191 case L2CAP_CONF_QOS:
3192 break;
3193
6464f35f
MH		 3194 case L2CAP_CONF_RFC:
3195 if (olen == sizeof(rfc))
3196 memcpy(&rfc, (void *) val, olen);
3197 break;
3198
fcc203c3
GP		 3199 case L2CAP_CONF_FCS:
3200 if (val == L2CAP_FCS_NONE)
c1360a1c 3201 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 3202 break;
fcc203c3 3203
42dceae2
AE		 3204 case L2CAP_CONF_EFS:
3205 remote_efs = 1;
3206 if (olen == sizeof(efs))
3207 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3208 break;
3209
6327eb98
AE		 3210 case L2CAP_CONF_EWS:
3211 if (!enable_hs)
3212 return -ECONNREFUSED;
fcc203c3 3213
6327eb98
AE		 3214 set_bit(FLAG_EXT_CTRL, &chan->flags);
3215 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3216 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3217 chan->remote_tx_win = val;
fcc203c3
GP		 3218 break;
3219
5dee9e7c
MH		 3220 default:
3221 if (hint)
3222 break;
3223
3224 result = L2CAP_CONF_UNKNOWN;
3225 *((u8 *) ptr++) = type;
3226 break;
3227 }
3228 }
3229
73ffa904 3230 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3231 goto done;
3232
0c1bc5c6 3233 switch (chan->mode) {
f2fcfcd6
GP		 3234 case L2CAP_MODE_STREAMING:
3235 case L2CAP_MODE_ERTM:
c1360a1c 3236 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3237 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3238 chan->conn->feat_mask);
85eb53c6
GP		 3239 break;
3240 }
3241
42dceae2
AE		 3242 if (remote_efs) {
3243 if (__l2cap_efs_supported(chan))
3244 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3245 else
3246 return -ECONNREFUSED;
3247 }
3248
0c1bc5c6 3249 if (chan->mode != rfc.mode)
f2fcfcd6 3250 return -ECONNREFUSED;
742e519b 3251
f2fcfcd6 3252 break;
f2fcfcd6
GP		 3253 }
3254
3255done:
0c1bc5c6 3256 if (chan->mode != rfc.mode) {
f2fcfcd6 3257 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3258 rfc.mode = chan->mode;
f2fcfcd6 3259
73ffa904 3260 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3261 return -ECONNREFUSED;
3262
2d792818
GP		 3263 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3264 (unsigned long) &rfc);
f2fcfcd6
GP		 3265 }
3266
5dee9e7c
MH		 3267 if (result == L2CAP_CONF_SUCCESS) {
3268 /* Configure output options and let the other side know
3269 * which ones we don't like. */
3270
f2fcfcd6
GP		 3271 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3272 result = L2CAP_CONF_UNACCEPT;
3273 else {
0c1bc5c6 3274 chan->omtu = mtu;
c1360a1c 3275 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3276 }
0c1bc5c6 3277 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3278
42dceae2
AE		 3279 if (remote_efs) {
3280 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3281 efs.stype != L2CAP_SERV_NOTRAFIC &&
3282 efs.stype != chan->local_stype) {
42dceae2
AE		 3283
3284 result = L2CAP_CONF_UNACCEPT;
3285
3286 if (chan->num_conf_req >= 1)
3287 return -ECONNREFUSED;
3288
3289 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3290 sizeof(efs),
3291 (unsigned long) &efs);
0e8b207e 3292 } else {
3e6b3b95 3293 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3294 result = L2CAP_CONF_PENDING;
3295 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3296 }
3297 }
3298
f2fcfcd6
GP		 3299 switch (rfc.mode) {
3300 case L2CAP_MODE_BASIC:
47d1ec61 3301 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3302 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3303 break;
3304
3305 case L2CAP_MODE_ERTM:
6327eb98
AE		 3306 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3307 chan->remote_tx_win = rfc.txwin_size;
3308 else
3309 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3310
2c03a7a4 3311 chan->remote_max_tx = rfc.max_transmit;
1c762159 3312
c8f79162 3313 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3314 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3315 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3316 rfc.max_pdu_size = cpu_to_le16(size);
3317 chan->remote_mps = size;
f2fcfcd6 3318
36c86c85 3319 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3320
c1360a1c 3321 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3322
3323 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3324 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3325
42dceae2
AE		 3326 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3327 chan->remote_id = efs.id;
3328 chan->remote_stype = efs.stype;
3329 chan->remote_msdu = le16_to_cpu(efs.msdu);
3330 chan->remote_flush_to =
2d792818 3331 le32_to_cpu(efs.flush_to);
42dceae2 3332 chan->remote_acc_lat =
2d792818 3333 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3334 chan->remote_sdu_itime =
3335 le32_to_cpu(efs.sdu_itime);
3336 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3337 sizeof(efs),
3338 (unsigned long) &efs);
42dceae2 3339 }
f2fcfcd6
GP		 3340 break;
3341
3342 case L2CAP_MODE_STREAMING:
c8f79162 3343 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3344 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3345 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3346 rfc.max_pdu_size = cpu_to_le16(size);
3347 chan->remote_mps = size;
f2fcfcd6 3348
c1360a1c 3349 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3350
2d792818
GP		 3351 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3352 (unsigned long) &rfc);
68ae6639 3353
f2fcfcd6
GP		 3354 break;
3355
3356 default:
5dee9e7c 3357 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3358
6464f35f 3359 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3360 rfc.mode = chan->mode;
f2fcfcd6 3361 }
6464f35f 3362
f2fcfcd6 3363 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3364 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3365 }
fe4128e0 3366 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3367 rsp->result = cpu_to_le16(result);
59e54bd1 3368 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3369
3370 return ptr - data;
1da177e4
LT		 3371}
3372
2d792818
GP		 3373static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3374 void *data, u16 *result)
f2fcfcd6 3375{
f2fcfcd6
GP		 3376 struct l2cap_conf_req *req = data;
3377 void *ptr = req->data;
3378 int type, olen;
3379 unsigned long val;
36e999a8 3380 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3381 struct l2cap_conf_efs efs;
f2fcfcd6 3382
fe4128e0 3383 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3384
3385 while (len >= L2CAP_CONF_OPT_SIZE) {
3386 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3387
3388 switch (type) {
3389 case L2CAP_CONF_MTU:
3390 if (val < L2CAP_DEFAULT_MIN_MTU) {
3391 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3392 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3393 } else
0c1bc5c6
GP		 3394 chan->imtu = val;
3395 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3396 break;
3397
3398 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3399 chan->flush_to = val;
f2fcfcd6 3400 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3401 2, chan->flush_to);
f2fcfcd6
GP		 3402 break;
3403
3404 case L2CAP_CONF_RFC:
3405 if (olen == sizeof(rfc))
3406 memcpy(&rfc, (void *)val, olen);
3407
c1360a1c 3408 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3409 rfc.mode != chan->mode)
f2fcfcd6
GP		 3410 return -ECONNREFUSED;
3411
47d1ec61 3412 chan->fcs = 0;
f2fcfcd6
GP		 3413
3414 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3415 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3416 break;
6327eb98
AE		 3417
3418 case L2CAP_CONF_EWS:
c20f8e35 3419 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3420 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3421 chan->tx_win);
6327eb98 3422 break;
66af7aaf
AE		 3423
3424 case L2CAP_CONF_EFS:
3425 if (olen == sizeof(efs))
3426 memcpy(&efs, (void *)val, olen);
3427
3428 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3429 efs.stype != L2CAP_SERV_NOTRAFIC &&
3430 efs.stype != chan->local_stype)
66af7aaf
AE		 3431 return -ECONNREFUSED;
3432
2d792818
GP		 3433 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3434 (unsigned long) &efs);
66af7aaf 3435 break;
f2fcfcd6
GP		 3436 }
3437 }
3438
0c1bc5c6 3439 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3440 return -ECONNREFUSED;
3441
0c1bc5c6 3442 chan->mode = rfc.mode;
6c2ea7a8 3443
0e8b207e 3444 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3445 switch (rfc.mode) {
3446 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3447 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3448 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3449 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3450 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3451 chan->ack_win = min_t(u16, chan->ack_win,
3452 rfc.txwin_size);
66af7aaf
AE		 3453
3454 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3455 chan->local_msdu = le16_to_cpu(efs.msdu);
3456 chan->local_sdu_itime =
2d792818 3457 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3458 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3459 chan->local_flush_to =
2d792818 3460 le32_to_cpu(efs.flush_to);
66af7aaf 3461 }
f2fcfcd6 3462 break;
66af7aaf 3463
f2fcfcd6 3464 case L2CAP_MODE_STREAMING:
47d1ec61 3465 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3466 }
3467 }
3468
fe4128e0 3469 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3470 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3471
3472 return ptr - data;
3473}
3474
2d792818
GP		 3475static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3476 u16 result, u16 flags)
1da177e4
LT		 3477{
3478 struct l2cap_conf_rsp *rsp = data;
3479 void *ptr = rsp->data;
1da177e4 3480
fe4128e0 3481 BT_DBG("chan %p", chan);
1da177e4 3482
fe4128e0 3483 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3484 rsp->result = cpu_to_le16(result);
aca3192c 3485 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3486
3487 return ptr - data;
3488}
3489
8c1d787b 3490void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3491{
3492 struct l2cap_conn_rsp rsp;
8c1d787b 3493 struct l2cap_conn *conn = chan->conn;
710f9b0a 3494 u8 buf[128];
439f34ac 3495 u8 rsp_code;
710f9b0a 3496
fe4128e0
GP		 3497 rsp.scid = cpu_to_le16(chan->dcid);
3498 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3499 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3500 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3501
3502 if (chan->hs_hcon)
3503 rsp_code = L2CAP_CREATE_CHAN_RSP;
3504 else
3505 rsp_code = L2CAP_CONN_RSP;
3506
3507 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3508
3509 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3510
c1360a1c 3511 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3512 return;
3513
710f9b0a 3514 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3515 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3516 chan->num_conf_req++;
3517}
3518
47d1ec61 3519static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3520{
7b1c0049
GP		 3521 int type, olen;
3522 unsigned long val;
c20f8e35
MM		 3523 /* Use sane default values in case a misbehaving remote device
3524 * did not send an RFC or extended window size option.
3525 */
3526 u16 txwin_ext = chan->ack_win;
3527 struct l2cap_conf_rfc rfc = {
3528 .mode = chan->mode,
3529 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3530 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3531 .max_pdu_size = cpu_to_le16(chan->imtu),
3532 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3533 };
7b1c0049 3534
47d1ec61 3535 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3536
0c1bc5c6 3537 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3538 return;
3539
3540 while (len >= L2CAP_CONF_OPT_SIZE) {
3541 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3542
c20f8e35
MM		 3543 switch (type) {
3544 case L2CAP_CONF_RFC:
3545 if (olen == sizeof(rfc))
3546 memcpy(&rfc, (void *)val, olen);
8f321f85 3547 break;
c20f8e35
MM		 3548 case L2CAP_CONF_EWS:
3549 txwin_ext = val;
3550 break;
3551 }
7b1c0049
GP		 3552 }
3553
7b1c0049
GP		 3554 switch (rfc.mode) {
3555 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3556 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3557 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3558 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3559 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3560 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3561 else
3562 chan->ack_win = min_t(u16, chan->ack_win,
3563 rfc.txwin_size);
7b1c0049
GP		 3564 break;
3565 case L2CAP_MODE_STREAMING:
47d1ec61 3566 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3567 }
3568}
3569
2d792818
GP		 3570static inline int l2cap_command_rej(struct l2cap_conn *conn,
3571 struct l2cap_cmd_hdr *cmd, u8 *data)
4e8402a3 3572{
e2fd318e 3573 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3574
e2fd318e 3575 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3576 return 0;
3577
3578 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3579 cmd->ident == conn->info_ident) {
17cd3f37 3580 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3581
3582 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3583 conn->info_ident = 0;
984947dc 3584
4e8402a3
MH		 3585 l2cap_conn_start(conn);
3586 }
3587
3588 return 0;
3589}
3590
1700915f
MM		 3591static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3592 struct l2cap_cmd_hdr *cmd,
3593 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3594{
1da177e4
LT		 3595 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3596 struct l2cap_conn_rsp rsp;
23691d75 3597 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3598 struct sock *parent, *sk = NULL;
e7c29cb1 3599 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3600
3601 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3602 __le16 psm = req->psm;
1da177e4 3603
097db76c 3604 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3605
3606 /* Check if we have socket listening on psm */
c2287681 3607 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
23691d75 3608 if (!pchan) {
1da177e4
LT		 3609 result = L2CAP_CR_BAD_PSM;
3610 goto sendresp;
3611 }
3612
23691d75
GP		 3613 parent = pchan->sk;
3614
3df91ea2 3615 mutex_lock(&conn->chan_lock);
aa2ac881 3616 lock_sock(parent);
e0f0cb56 3617
e7c29cb1 3618 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3619 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3620 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3621 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3622 result = L2CAP_CR_SEC_BLOCK;
3623 goto response;
3624 }
3625
1da177e4
LT		 3626 result = L2CAP_CR_NO_MEM;
3627
2dfa1003
GP		 3628 /* Check if we already have channel with that dcid */
3629 if (__l2cap_get_chan_by_dcid(conn, scid))
3630 goto response;
3631
80b98027 3632 chan = pchan->ops->new_connection(pchan);
80808e43 3633 if (!chan)
1da177e4
LT		 3634 goto response;
3635
80808e43
GP		 3636 sk = chan->sk;
3637
1da177e4
LT		 3638 hci_conn_hold(conn->hcon);
3639
1da177e4
LT		 3640 bacpy(&bt_sk(sk)->src, conn->src);
3641 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 3642 chan->psm = psm;
3643 chan->dcid = scid;
1700915f 3644 chan->local_amp_id = amp_id;
1da177e4 3645
6be36555 3646 __l2cap_chan_add(conn, chan);
48454079 3647
fe4128e0 3648 dcid = chan->scid;
1da177e4 3649
c9b66675 3650 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 3651
fc7f8a7e 3652 chan->ident = cmd->ident;
1da177e4 3653
984947dc 3654 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3655 if (l2cap_chan_check_security(chan)) {
c5daa683 3656 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
0e587be7 3657 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3658 result = L2CAP_CR_PEND;
3659 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3660 chan->ops->defer(chan);
f66dc81f 3661 } else {
1700915f
MM		 3662 /* Force pending result for AMP controllers.
3663 * The connection will succeed after the
3664 * physical link is up.
3665 */
3666 if (amp_id) {
3667 __l2cap_state_change(chan, BT_CONNECT2);
3668 result = L2CAP_CR_PEND;
3669 } else {
3670 __l2cap_state_change(chan, BT_CONFIG);
3671 result = L2CAP_CR_SUCCESS;
3672 }
f66dc81f
MH		 3673 status = L2CAP_CS_NO_INFO;
3674 }
79d554a6 3675 } else {
0e587be7 3676 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3677 result = L2CAP_CR_PEND;
3678 status = L2CAP_CS_AUTHEN_PEND;
3679 }
3680 } else {
0e587be7 3681 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3682 result = L2CAP_CR_PEND;
3683 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3684 }
3685
1da177e4 3686response:
aa2ac881 3687 release_sock(parent);
3df91ea2 3688 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3689
3690sendresp:
aca3192c
YH		 3691 rsp.scid = cpu_to_le16(scid);
3692 rsp.dcid = cpu_to_le16(dcid);
3693 rsp.result = cpu_to_le16(result);
3694 rsp.status = cpu_to_le16(status);
4c89b6aa 3695 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3696
3697 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3698 struct l2cap_info_req info;
ac73498c 3699 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3700
3701 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3702 conn->info_ident = l2cap_get_ident(conn);
3703
ba13ccd9 3704 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3705
2d792818
GP		 3706 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3707 sizeof(info), &info);
79d554a6
MH		 3708 }
3709
c1360a1c 3710 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3711 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3712 u8 buf[128];
c1360a1c 3713 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3714 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3715 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3716 chan->num_conf_req++;
e9aeb2dd 3717 }
1700915f
MM		 3718
3719 return chan;
4c89b6aa 3720}
e9aeb2dd 3721
4c89b6aa
MM		 3722static int l2cap_connect_req(struct l2cap_conn *conn,
3723 struct l2cap_cmd_hdr *cmd, u8 *data)
3724{
300229f9 3725 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3726 return 0;
3727}
3728
5909cf30 3729static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
2d792818 3730 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 3731{
3732 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3733 u16 scid, dcid, result, status;
48454079 3734 struct l2cap_chan *chan;
1da177e4 3735 u8 req[128];
3df91ea2 3736 int err;
1da177e4
LT		 3737
3738 scid = __le16_to_cpu(rsp->scid);
3739 dcid = __le16_to_cpu(rsp->dcid);
3740 result = __le16_to_cpu(rsp->result);
3741 status = __le16_to_cpu(rsp->status);
3742
1b009c98 3743 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3744 dcid, scid, result, status);
1da177e4 3745
3df91ea2
AE		 3746 mutex_lock(&conn->chan_lock);
3747
1da177e4 3748 if (scid) {
3df91ea2
AE		 3749 chan = __l2cap_get_chan_by_scid(conn, scid);
3750 if (!chan) {
3751 err = -EFAULT;
3752 goto unlock;
3753 }
1da177e4 3754 } else {
3df91ea2
AE		 3755 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3756 if (!chan) {
3757 err = -EFAULT;
3758 goto unlock;
3759 }
1da177e4
LT		 3760 }
3761
3df91ea2
AE		 3762 err = 0;
3763
6be36555 3764 l2cap_chan_lock(chan);
48454079 3765
1da177e4
LT		 3766 switch (result) {
3767 case L2CAP_CR_SUCCESS:
89bc500e 3768 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3769 chan->ident = 0;
fe4128e0 3770 chan->dcid = dcid;
c1360a1c 3771 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3772
c1360a1c 3773 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3774 break;
3775
1da177e4 3776 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3777 l2cap_build_conf_req(chan, req), req);
73ffa904 3778 chan->num_conf_req++;
1da177e4
LT		 3779 break;
3780
3781 case L2CAP_CR_PEND:
c1360a1c 3782 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3783 break;
3784
3785 default:
48454079 3786 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3787 break;
3788 }
3789
6be36555 3790 l2cap_chan_unlock(chan);
3df91ea2
AE		 3791
3792unlock:
3793 mutex_unlock(&conn->chan_lock);
3794
3795 return err;
1da177e4
LT		 3796}
3797
47d1ec61 3798static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3799{
3800 /* FCS is enabled only in ERTM or streaming mode, if one or both
3801 * sides request it.
3802 */
0c1bc5c6 3803 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3804 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3805 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 3806 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3807}
3808
29d8a590
AE		 3809static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3810 u8 ident, u16 flags)
3811{
3812 struct l2cap_conn *conn = chan->conn;
3813
3814 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3815 flags);
3816
3817 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3818 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3819
3820 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3821 l2cap_build_conf_rsp(chan, data,
3822 L2CAP_CONF_SUCCESS, flags), data);
3823}
3824
2d792818
GP		 3825static inline int l2cap_config_req(struct l2cap_conn *conn,
3826 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3827 u8 *data)
1da177e4
LT		 3828{
3829 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3830 u16 dcid, flags;
3831 u8 rsp[64];
48454079 3832 struct l2cap_chan *chan;
3c588192 3833 int len, err = 0;
1da177e4
LT		 3834
3835 dcid = __le16_to_cpu(req->dcid);
3836 flags = __le16_to_cpu(req->flags);
3837
3838 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3839
baa7e1fa 3840 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3841 if (!chan)
1da177e4
LT		 3842 return -ENOENT;
3843
033b1142 3844 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 3845 struct l2cap_cmd_rej_cid rej;
3846
ac73498c 3847 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
e2fd318e
IK		 3848 rej.scid = cpu_to_le16(chan->scid);
3849 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 3850
df6bd743 3851 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2d792818 3852 sizeof(rej), &rej);
354f60a9 3853 goto unlock;
df6bd743 3854 }
354f60a9 3855
5dee9e7c 3856 /* Reject if config buffer is too small. */
88219a0f 3857 len = cmd_len - sizeof(*req);
7ac28817 3858 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 3859 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 3860 l2cap_build_conf_rsp(chan, rsp,
3861 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 3862 goto unlock;
3863 }
3864
3865 /* Store config. */
73ffa904
GP		 3866 memcpy(chan->conf_req + chan->conf_len, req->data, len);
3867 chan->conf_len += len;
1da177e4 3868
59e54bd1 3869 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 3870 /* Incomplete config. Send empty response. */
3871 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 3872 l2cap_build_conf_rsp(chan, rsp,
3873 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 3874 goto unlock;
3875 }
3876
3877 /* Complete config. */
73ffa904 3878 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 3879 if (len < 0) {
e92c8e70 3880 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 3881 goto unlock;
f2fcfcd6 3882 }
1da177e4 3883
1500109b 3884 chan->ident = cmd->ident;
5dee9e7c 3885 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 3886 chan->num_conf_rsp++;
5dee9e7c 3887
5dee9e7c 3888 /* Reset config buffer. */
73ffa904 3889 chan->conf_len = 0;
5dee9e7c 3890
c1360a1c 3891 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 3892 goto unlock;
3893
c1360a1c 3894 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 3895 set_default_fcs(chan);
fcc203c3 3896
105bdf9e
MM		 3897 if (chan->mode == L2CAP_MODE_ERTM ||
3898 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 3899 err = l2cap_ertm_init(chan);
3900
3901 if (err < 0)
3902 l2cap_send_disconn_req(chan->conn, chan, -err);
3903 else
3904 l2cap_chan_ready(chan);
0565c1c2 3905
876d9484
MH		 3906 goto unlock;
3907 }
3908
c1360a1c 3909 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 3910 u8 buf[64];
1da177e4 3911 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3912 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3913 chan->num_conf_req++;
1da177e4
LT		 3914 }
3915
0e8b207e
AE		 3916 /* Got Conf Rsp PENDING from remote side and asume we sent
3917 Conf Rsp PENDING in the code above */
3918 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 3919 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 3920
3921 /* check compatibility */
3922
79de886d 3923 /* Send rsp for BR/EDR channel */
f351bc72 3924 if (!chan->hs_hcon)
79de886d
AE		 3925 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
3926 else
3927 chan->ident = cmd->ident;
0e8b207e
AE		 3928 }
3929
1da177e4 3930unlock:
6be36555 3931 l2cap_chan_unlock(chan);
3c588192 3932 return err;
1da177e4
LT		 3933}
3934
2d792818
GP		 3935static inline int l2cap_config_rsp(struct l2cap_conn *conn,
3936 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 3937{
3938 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3939 u16 scid, flags, result;
48454079 3940 struct l2cap_chan *chan;
61386cba 3941 int len = le16_to_cpu(cmd->len) - sizeof(*rsp);
3c588192 3942 int err = 0;
1da177e4
LT		 3943
3944 scid = __le16_to_cpu(rsp->scid);
3945 flags = __le16_to_cpu(rsp->flags);
3946 result = __le16_to_cpu(rsp->result);
3947
61386cba
AE		 3948 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
3949 result, len);
1da177e4 3950
baa7e1fa 3951 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3952 if (!chan)
1da177e4
LT		 3953 return 0;
3954
3955 switch (result) {
3956 case L2CAP_CONF_SUCCESS:
47d1ec61 3957 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 3958 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 3959 break;
3960
0e8b207e
AE		 3961 case L2CAP_CONF_PENDING:
3962 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
3963
3964 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
3965 char buf[64];
3966
3967 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 3968 buf, &result);
0e8b207e
AE		 3969 if (len < 0) {
3970 l2cap_send_disconn_req(conn, chan, ECONNRESET);
3971 goto done;
3972 }
3973
f351bc72 3974 if (!chan->hs_hcon) {
79de886d
AE		 3975 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
3976 0);
5ce66b59
AE		 3977 } else {
3978 if (l2cap_check_efs(chan)) {
3979 amp_create_logical_link(chan);
3980 chan->ident = cmd->ident;
3981 }
3982 }
0e8b207e
AE		 3983 }
3984 goto done;
3985
1da177e4 3986 case L2CAP_CONF_UNACCEPT:
73ffa904 3987 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3988 char req[64];
3989
c2c77ec8 3990 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 3991 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 3992 goto done;
3993 }
3994
f2fcfcd6
GP		 3995 /* throw out any old stored conf requests */
3996 result = L2CAP_CONF_SUCCESS;
b4450035 3997 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 3998 req, &result);
f2fcfcd6 3999 if (len < 0) {
e92c8e70 4000 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 4001 goto done;
4002 }
4003
4004 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4005 L2CAP_CONF_REQ, len, req);
73ffa904 4006 chan->num_conf_req++;
f2fcfcd6
GP		 4007 if (result != L2CAP_CONF_SUCCESS)
4008 goto done;
4009 break;
1da177e4
LT		 4010 }
4011
8e87d142 4012 default:
6be36555 4013 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4014
ba13ccd9 4015 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
e92c8e70 4016 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 4017 goto done;
4018 }
4019
59e54bd1 4020 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4021 goto done;
4022
c1360a1c 4023 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4024
c1360a1c 4025 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4026 set_default_fcs(chan);
fcc203c3 4027
105bdf9e
MM		 4028 if (chan->mode == L2CAP_MODE_ERTM ||
4029 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4030 err = l2cap_ertm_init(chan);
0565c1c2 4031
3c588192
MM		 4032 if (err < 0)
4033 l2cap_send_disconn_req(chan->conn, chan, -err);
4034 else
4035 l2cap_chan_ready(chan);
1da177e4
LT		 4036 }
4037
4038done:
6be36555 4039 l2cap_chan_unlock(chan);
3c588192 4040 return err;
1da177e4
LT		 4041}
4042
2d792818
GP		 4043static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4044 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4045{
4046 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4047 struct l2cap_disconn_rsp rsp;
4048 u16 dcid, scid;
48454079 4049 struct l2cap_chan *chan;
1da177e4
LT		 4050 struct sock *sk;
4051
4052 scid = __le16_to_cpu(req->scid);
4053 dcid = __le16_to_cpu(req->dcid);
4054
4055 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4056
3df91ea2
AE		 4057 mutex_lock(&conn->chan_lock);
4058
4059 chan = __l2cap_get_chan_by_scid(conn, dcid);
4060 if (!chan) {
4061 mutex_unlock(&conn->chan_lock);
1da177e4 4062 return 0;
3df91ea2 4063 }
1da177e4 4064
6be36555
AE		 4065 l2cap_chan_lock(chan);
4066
48454079
GP		 4067 sk = chan->sk;
4068
fe4128e0
GP		 4069 rsp.dcid = cpu_to_le16(chan->scid);
4070 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4071 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4072
6be36555 4073 lock_sock(sk);
1da177e4 4074 sk->sk_shutdown = SHUTDOWN_MASK;
6be36555 4075 release_sock(sk);
1da177e4 4076
61d6ef3e 4077 l2cap_chan_hold(chan);
48454079 4078 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4079
4080 l2cap_chan_unlock(chan);
1da177e4 4081
80b98027 4082 chan->ops->close(chan);
61d6ef3e 4083 l2cap_chan_put(chan);
3df91ea2
AE		 4084
4085 mutex_unlock(&conn->chan_lock);
4086
1da177e4
LT		 4087 return 0;
4088}
4089
2d792818
GP		 4090static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4091 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4092{
4093 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4094 u16 dcid, scid;
48454079 4095 struct l2cap_chan *chan;
1da177e4
LT		 4096
4097 scid = __le16_to_cpu(rsp->scid);
4098 dcid = __le16_to_cpu(rsp->dcid);
4099
4100 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4101
3df91ea2
AE		 4102 mutex_lock(&conn->chan_lock);
4103
4104 chan = __l2cap_get_chan_by_scid(conn, scid);
4105 if (!chan) {
4106 mutex_unlock(&conn->chan_lock);
1da177e4 4107 return 0;
3df91ea2 4108 }
1da177e4 4109
6be36555 4110 l2cap_chan_lock(chan);
48454079 4111
61d6ef3e 4112 l2cap_chan_hold(chan);
48454079 4113 l2cap_chan_del(chan, 0);
6be36555
AE		 4114
4115 l2cap_chan_unlock(chan);
1da177e4 4116
80b98027 4117 chan->ops->close(chan);
61d6ef3e 4118 l2cap_chan_put(chan);
3df91ea2
AE		 4119
4120 mutex_unlock(&conn->chan_lock);
4121
1da177e4
LT		 4122 return 0;
4123}
4124
2d792818
GP		 4125static inline int l2cap_information_req(struct l2cap_conn *conn,
4126 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4127{
4128 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4129 u16 type;
4130
4131 type = __le16_to_cpu(req->type);
4132
4133 BT_DBG("type 0x%4.4x", type);
4134
f0709e03
MH		 4135 if (type == L2CAP_IT_FEAT_MASK) {
4136 u8 buf[8];
44dd46de 4137 u32 feat_mask = l2cap_feat_mask;
f0709e03 4138 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4139 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4140 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4141 if (!disable_ertm)
fcc203c3 4142 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4143 | L2CAP_FEAT_FCS;
a5fd6f30 4144 if (enable_hs)
6327eb98 4145 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4146 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4147
1b7bf4ed 4148 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4149 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4150 buf);
e1027a7c
MH		 4151 } else if (type == L2CAP_IT_FIXED_CHAN) {
4152 u8 buf[12];
4153 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 4154
4155 if (enable_hs)
4156 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4157 else
4158 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4159
ac73498c
AE		 4160 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4161 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4162 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4163 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4164 buf);
f0709e03
MH		 4165 } else {
4166 struct l2cap_info_rsp rsp;
4167 rsp.type = cpu_to_le16(type);
ac73498c 4168 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4169 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4170 &rsp);
f0709e03 4171 }
1da177e4
LT		 4172
4173 return 0;
4174}
4175
2d792818
GP		 4176static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4177 struct l2cap_cmd_hdr *cmd, u8 *data)
1da177e4
LT		 4178{
4179 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4180 u16 type, result;
4181
4182 type = __le16_to_cpu(rsp->type);
4183 result = __le16_to_cpu(rsp->result);
4184
4185 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4186
e90165be
AE		 4187 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4188 if (cmd->ident != conn->info_ident ||
2d792818 4189 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4190 return 0;
4191
17cd3f37 4192 cancel_delayed_work(&conn->info_timer);
4e8402a3 4193
adb08ede
VT		 4194 if (result != L2CAP_IR_SUCCESS) {
4195 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4196 conn->info_ident = 0;
4197
4198 l2cap_conn_start(conn);
4199
4200 return 0;
4201 }
4202
978c93b9
AE		 4203 switch (type) {
4204 case L2CAP_IT_FEAT_MASK:
83985319 4205 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4206
47ec1dcd 4207 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4208 struct l2cap_info_req req;
ac73498c 4209 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4210
4211 conn->info_ident = l2cap_get_ident(conn);
4212
4213 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4214 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4215 } else {
4216 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4217 conn->info_ident = 0;
4218
4219 l2cap_conn_start(conn);
4220 }
978c93b9
AE		 4221 break;
4222
4223 case L2CAP_IT_FIXED_CHAN:
4224 conn->fixed_chan_mask = rsp->data[0];
984947dc 4225 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4226 conn->info_ident = 0;
984947dc
MH		 4227
4228 l2cap_conn_start(conn);
978c93b9 4229 break;
984947dc 4230 }
4e8402a3 4231
1da177e4
LT		 4232 return 0;
4233}
4234
1700915f
MM		 4235static int l2cap_create_channel_req(struct l2cap_conn *conn,
4236 struct l2cap_cmd_hdr *cmd,
4237 u16 cmd_len, void *data)
f94ff6ff
MM		 4238{
4239 struct l2cap_create_chan_req *req = data;
6e1df6a6 4240 struct l2cap_create_chan_rsp rsp;
1700915f 4241 struct l2cap_chan *chan;
6e1df6a6 4242 struct hci_dev *hdev;
f94ff6ff
MM		 4243 u16 psm, scid;
4244
4245 if (cmd_len != sizeof(*req))
4246 return -EPROTO;
4247
4248 if (!enable_hs)
4249 return -EINVAL;
4250
4251 psm = le16_to_cpu(req->psm);
4252 scid = le16_to_cpu(req->scid);
4253
ad0ac6ca 4254 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4255
6e1df6a6
AE		 4256 /* For controller id 0 make BR/EDR connection */
4257 if (req->amp_id == HCI_BREDR_ID) {
4258 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4259 req->amp_id);
4260 return 0;
4261 }
1700915f 4262
6e1df6a6
AE		 4263 /* Validate AMP controller id */
4264 hdev = hci_dev_get(req->amp_id);
4265 if (!hdev)
4266 goto error;
1700915f 4267
6e1df6a6
AE		 4268 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4269 hci_dev_put(hdev);
4270 goto error;
4271 }
1700915f 4272
6e1df6a6
AE		 4273 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4274 req->amp_id);
4275 if (chan) {
4276 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4277 struct hci_conn *hs_hcon;
1700915f 4278
6e1df6a6
AE		 4279 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst);
4280 if (!hs_hcon) {
4281 hci_dev_put(hdev);
4282 return -EFAULT;
1700915f
MM		 4283 }
4284
6e1df6a6
AE		 4285 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4286
6e1df6a6
AE		 4287 mgr->bredr_chan = chan;
4288 chan->hs_hcon = hs_hcon;
4289 conn->mtu = hdev->block_mtu;
1700915f 4290 }
f94ff6ff 4291
6e1df6a6 4292 hci_dev_put(hdev);
f94ff6ff
MM		 4293
4294 return 0;
6e1df6a6
AE		 4295
4296error:
4297 rsp.dcid = 0;
4298 rsp.scid = cpu_to_le16(scid);
4299 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4300 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4301
4302 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4303 sizeof(rsp), &rsp);
4304
4305 return -EFAULT;
f94ff6ff
MM		 4306}
4307
8eb200bd
MM		 4308static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4309{
4310 struct l2cap_move_chan_req req;
4311 u8 ident;
4312
4313 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4314
4315 ident = l2cap_get_ident(chan->conn);
4316 chan->ident = ident;
4317
4318 req.icid = cpu_to_le16(chan->scid);
4319 req.dest_amp_id = dest_amp_id;
4320
4321 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4322 &req);
4323
4324 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4325}
4326
1500109b 4327static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4328{
4329 struct l2cap_move_chan_rsp rsp;
4330
1500109b 4331 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4332
1500109b 4333 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4334 rsp.result = cpu_to_le16(result);
4335
1500109b
MM		 4336 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4337 sizeof(rsp), &rsp);
8d5a04a1
MM		 4338}
4339
5b155ef9 4340static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4341{
4342 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4343
5b155ef9 4344 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4345
5b155ef9 4346 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4347
5b155ef9 4348 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4349 cfm.result = cpu_to_le16(result);
4350
5b155ef9
MM		 4351 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4352 sizeof(cfm), &cfm);
4353
4354 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4355}
4356
4357static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4358{
4359 struct l2cap_move_chan_cfm cfm;
4360
4361 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4362
4363 cfm.icid = cpu_to_le16(icid);
4364 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4365
4366 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4367 sizeof(cfm), &cfm);
8d5a04a1
MM		 4368}
4369
4370static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4371 u16 icid)
8d5a04a1
MM		 4372{
4373 struct l2cap_move_chan_cfm_rsp rsp;
4374
ad0ac6ca 4375 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4376
4377 rsp.icid = cpu_to_le16(icid);
4378 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4379}
4380
5f3847a4
MM		 4381static void __release_logical_link(struct l2cap_chan *chan)
4382{
4383 chan->hs_hchan = NULL;
4384 chan->hs_hcon = NULL;
4385
4386 /* Placeholder - release the logical link */
4387}
4388
1500109b
MM		 4389static void l2cap_logical_fail(struct l2cap_chan *chan)
4390{
4391 /* Logical link setup failed */
4392 if (chan->state != BT_CONNECTED) {
4393 /* Create channel failure, disconnect */
4394 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
4395 return;
4396 }
4397
4398 switch (chan->move_role) {
4399 case L2CAP_MOVE_ROLE_RESPONDER:
4400 l2cap_move_done(chan);
4401 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4402 break;
4403 case L2CAP_MOVE_ROLE_INITIATOR:
4404 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4405 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4406 /* Remote has only sent pending or
4407 * success responses, clean up
4408 */
4409 l2cap_move_done(chan);
4410 }
4411
4412 /* Other amp move states imply that the move
4413 * has already aborted
4414 */
4415 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4416 break;
4417 }
4418}
4419
4420static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4421 struct hci_chan *hchan)
4422{
4423 struct l2cap_conf_rsp rsp;
1500109b 4424
336178a3 4425 chan->hs_hchan = hchan;
1500109b
MM		 4426 chan->hs_hcon->l2cap_data = chan->conn;
4427
35ba9561 4428 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4429
4430 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4431 int err;
1500109b
MM		 4432
4433 set_default_fcs(chan);
4434
4435 err = l2cap_ertm_init(chan);
4436 if (err < 0)
4437 l2cap_send_disconn_req(chan->conn, chan, -err);
4438 else
4439 l2cap_chan_ready(chan);
4440 }
4441}
4442
4443static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4444 struct hci_chan *hchan)
4445{
4446 chan->hs_hcon = hchan->conn;
4447 chan->hs_hcon->l2cap_data = chan->conn;
4448
4449 BT_DBG("move_state %d", chan->move_state);
4450
4451 switch (chan->move_state) {
4452 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4453 /* Move confirm will be sent after a success
4454 * response is received
4455 */
4456 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4457 break;
4458 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4459 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4460 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4461 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4462 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4463 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4464 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4465 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4466 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4467 }
4468 break;
4469 default:
4470 /* Move was not in expected state, free the channel */
4471 __release_logical_link(chan);
4472
4473 chan->move_state = L2CAP_MOVE_STABLE;
4474 }
4475}
4476
4477/* Call with chan locked */
27695fb4
AE		 4478void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4479 u8 status)
5b155ef9 4480{
1500109b
MM		 4481 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4482
4483 if (status) {
4484 l2cap_logical_fail(chan);
4485 __release_logical_link(chan);
4486 return;
4487 }
4488
4489 if (chan->state != BT_CONNECTED) {
4490 /* Ignore logical link if channel is on BR/EDR */
4491 if (chan->local_amp_id)
4492 l2cap_logical_finish_create(chan, hchan);
4493 } else {
4494 l2cap_logical_finish_move(chan, hchan);
4495 }
5b155ef9
MM		 4496}
4497
3f7a56c4
MM		 4498void l2cap_move_start(struct l2cap_chan *chan)
4499{
4500 BT_DBG("chan %p", chan);
4501
4502 if (chan->local_amp_id == HCI_BREDR_ID) {
4503 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4504 return;
4505 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4506 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4507 /* Placeholder - start physical link setup */
4508 } else {
4509 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4510 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4511 chan->move_id = 0;
4512 l2cap_move_setup(chan);
4513 l2cap_send_move_chan_req(chan, 0);
4514 }
4515}
4516
8eb200bd
MM		 4517static void l2cap_do_create(struct l2cap_chan *chan, int result,
4518 u8 local_amp_id, u8 remote_amp_id)
4519{
12d6cc60
AE		 4520 chan->fcs = L2CAP_FCS_NONE;
4521
8eb200bd
MM		 4522 if (!test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
4523 struct l2cap_conn_rsp rsp;
4524 char buf[128];
4525 rsp.scid = cpu_to_le16(chan->dcid);
4526 rsp.dcid = cpu_to_le16(chan->scid);
4527
4528 /* Incoming channel on AMP */
4529 if (result == L2CAP_CR_SUCCESS) {
4530 /* Send successful response */
4531 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4532 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4533 } else {
4534 /* Send negative response */
4535 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4536 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4537 }
4538
4539 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4540 sizeof(rsp), &rsp);
4541
4542 if (result == L2CAP_CR_SUCCESS) {
4543 __l2cap_state_change(chan, BT_CONFIG);
4544 set_bit(CONF_REQ_SENT, &chan->conf_state);
4545 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4546 L2CAP_CONF_REQ,
4547 l2cap_build_conf_req(chan, buf), buf);
4548 chan->num_conf_req++;
4549 }
4550 } else {
4551 /* Outgoing channel on AMP */
4552 if (result == L2CAP_CR_SUCCESS) {
4553 chan->local_amp_id = local_amp_id;
4554 l2cap_send_create_chan_req(chan, remote_amp_id);
4555 } else {
4556 /* Revert to BR/EDR connect */
4557 l2cap_send_conn_req(chan);
4558 }
4559 }
4560}
4561
4562static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4563 u8 remote_amp_id)
4564{
4565 l2cap_move_setup(chan);
4566 chan->move_id = local_amp_id;
4567 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4568
4569 l2cap_send_move_chan_req(chan, remote_amp_id);
4570}
4571
4572static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4573{
4574 struct hci_chan *hchan = NULL;
4575
4576 /* Placeholder - get hci_chan for logical link */
4577
4578 if (hchan) {
4579 if (hchan->state == BT_CONNECTED) {
4580 /* Logical link is ready to go */
4581 chan->hs_hcon = hchan->conn;
4582 chan->hs_hcon->l2cap_data = chan->conn;
4583 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4584 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4585
4586 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4587 } else {
4588 /* Wait for logical link to be ready */
4589 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4590 }
4591 } else {
4592 /* Logical link not available */
4593 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4594 }
4595}
4596
4597static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4598{
4599 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4600 u8 rsp_result;
4601 if (result == -EINVAL)
4602 rsp_result = L2CAP_MR_BAD_ID;
4603 else
4604 rsp_result = L2CAP_MR_NOT_ALLOWED;
4605
4606 l2cap_send_move_chan_rsp(chan, rsp_result);
4607 }
4608
4609 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4610 chan->move_state = L2CAP_MOVE_STABLE;
4611
4612 /* Restart data transmission */
4613 l2cap_ertm_send(chan);
4614}
4615
a514b17f
AE		 4616/* Invoke with locked chan */
4617void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4618{
770bfefa 4619 u8 local_amp_id = chan->local_amp_id;
fffadc08 4620 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4621
8eb200bd
MM		 4622 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4623 chan, result, local_amp_id, remote_amp_id);
4624
8eb200bd
MM		 4625 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4626 l2cap_chan_unlock(chan);
4627 return;
4628 }
4629
4630 if (chan->state != BT_CONNECTED) {
4631 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4632 } else if (result != L2CAP_MR_SUCCESS) {
4633 l2cap_do_move_cancel(chan, result);
4634 } else {
4635 switch (chan->move_role) {
4636 case L2CAP_MOVE_ROLE_INITIATOR:
4637 l2cap_do_move_initiate(chan, local_amp_id,
4638 remote_amp_id);
4639 break;
4640 case L2CAP_MOVE_ROLE_RESPONDER:
4641 l2cap_do_move_respond(chan, result);
4642 break;
4643 default:
4644 l2cap_do_move_cancel(chan, result);
4645 break;
4646 }
4647 }
8eb200bd
MM		 4648}
4649
8d5a04a1 4650static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4651 struct l2cap_cmd_hdr *cmd,
4652 u16 cmd_len, void *data)
8d5a04a1
MM		 4653{
4654 struct l2cap_move_chan_req *req = data;
1500109b 4655 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4656 struct l2cap_chan *chan;
8d5a04a1
MM		 4657 u16 icid = 0;
4658 u16 result = L2CAP_MR_NOT_ALLOWED;
4659
4660 if (cmd_len != sizeof(*req))
4661 return -EPROTO;
4662
4663 icid = le16_to_cpu(req->icid);
4664
ad0ac6ca 4665 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1
MM		 4666
4667 if (!enable_hs)
4668 return -EINVAL;
4669
02b0fbb9
MM		 4670 chan = l2cap_get_chan_by_dcid(conn, icid);
4671 if (!chan) {
1500109b
MM		 4672 rsp.icid = cpu_to_le16(icid);
4673 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4674 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4675 sizeof(rsp), &rsp);
02b0fbb9
MM		 4676 return 0;
4677 }
4678
1500109b
MM		 4679 chan->ident = cmd->ident;
4680
02b0fbb9
MM		 4681 if (chan->scid < L2CAP_CID_DYN_START ||
4682 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4683 (chan->mode != L2CAP_MODE_ERTM &&
4684 chan->mode != L2CAP_MODE_STREAMING)) {
4685 result = L2CAP_MR_NOT_ALLOWED;
4686 goto send_move_response;
4687 }
4688
4689 if (chan->local_amp_id == req->dest_amp_id) {
4690 result = L2CAP_MR_SAME_ID;
4691 goto send_move_response;
4692 }
4693
4694 if (req->dest_amp_id) {
4695 struct hci_dev *hdev;
4696 hdev = hci_dev_get(req->dest_amp_id);
4697 if (!hdev || hdev->dev_type != HCI_AMP ||
4698 !test_bit(HCI_UP, &hdev->flags)) {
4699 if (hdev)
4700 hci_dev_put(hdev);
4701
4702 result = L2CAP_MR_BAD_ID;
4703 goto send_move_response;
4704 }
4705 hci_dev_put(hdev);
4706 }
4707
4708 /* Detect a move collision. Only send a collision response
4709 * if this side has "lost", otherwise proceed with the move.
4710 * The winner has the larger bd_addr.
4711 */
4712 if ((__chan_is_moving(chan) ||
4713 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4714 bacmp(conn->src, conn->dst) > 0) {
4715 result = L2CAP_MR_COLLISION;
4716 goto send_move_response;
4717 }
4718
02b0fbb9
MM		 4719 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4720 l2cap_move_setup(chan);
4721 chan->move_id = req->dest_amp_id;
4722 icid = chan->dcid;
4723
4724 if (!req->dest_amp_id) {
4725 /* Moving to BR/EDR */
4726 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4727 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4728 result = L2CAP_MR_PEND;
4729 } else {
4730 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4731 result = L2CAP_MR_SUCCESS;
4732 }
4733 } else {
4734 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4735 /* Placeholder - uncomment when amp functions are available */
4736 /*amp_accept_physical(chan, req->dest_amp_id);*/
4737 result = L2CAP_MR_PEND;
4738 }
4739
4740send_move_response:
1500109b 4741 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4742
02b0fbb9
MM		 4743 l2cap_chan_unlock(chan);
4744
8d5a04a1
MM		 4745 return 0;
4746}
4747
5b155ef9
MM		 4748static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4749{
4750 struct l2cap_chan *chan;
4751 struct hci_chan *hchan = NULL;
4752
4753 chan = l2cap_get_chan_by_scid(conn, icid);
4754 if (!chan) {
4755 l2cap_send_move_chan_cfm_icid(conn, icid);
4756 return;
4757 }
4758
4759 __clear_chan_timer(chan);
4760 if (result == L2CAP_MR_PEND)
4761 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4762
4763 switch (chan->move_state) {
4764 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4765 /* Move confirm will be sent when logical link
4766 * is complete.
4767 */
4768 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4769 break;
4770 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4771 if (result == L2CAP_MR_PEND) {
4772 break;
4773 } else if (test_bit(CONN_LOCAL_BUSY,
4774 &chan->conn_state)) {
4775 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4776 } else {
4777 /* Logical link is up or moving to BR/EDR,
4778 * proceed with move
4779 */
4780 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4781 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4782 }
4783 break;
4784 case L2CAP_MOVE_WAIT_RSP:
4785 /* Moving to AMP */
4786 if (result == L2CAP_MR_SUCCESS) {
4787 /* Remote is ready, send confirm immediately
4788 * after logical link is ready
4789 */
4790 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4791 } else {
4792 /* Both logical link and move success
4793 * are required to confirm
4794 */
4795 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4796 }
4797
4798 /* Placeholder - get hci_chan for logical link */
4799 if (!hchan) {
4800 /* Logical link not available */
4801 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4802 break;
4803 }
4804
4805 /* If the logical link is not yet connected, do not
4806 * send confirmation.
4807 */
4808 if (hchan->state != BT_CONNECTED)
4809 break;
4810
4811 /* Logical link is already ready to go */
4812
4813 chan->hs_hcon = hchan->conn;
4814 chan->hs_hcon->l2cap_data = chan->conn;
4815
4816 if (result == L2CAP_MR_SUCCESS) {
4817 /* Can confirm now */
4818 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4819 } else {
4820 /* Now only need move success
4821 * to confirm
4822 */
4823 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4824 }
4825
4826 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4827 break;
4828 default:
4829 /* Any other amp move state means the move failed. */
4830 chan->move_id = chan->local_amp_id;
4831 l2cap_move_done(chan);
4832 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4833 }
4834
4835 l2cap_chan_unlock(chan);
4836}
4837
4838static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
4839 u16 result)
4840{
4841 struct l2cap_chan *chan;
4842
4843 chan = l2cap_get_chan_by_ident(conn, ident);
4844 if (!chan) {
4845 /* Could not locate channel, icid is best guess */
4846 l2cap_send_move_chan_cfm_icid(conn, icid);
4847 return;
4848 }
4849
4850 __clear_chan_timer(chan);
4851
4852 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4853 if (result == L2CAP_MR_COLLISION) {
4854 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4855 } else {
4856 /* Cleanup - cancel move */
4857 chan->move_id = chan->local_amp_id;
4858 l2cap_move_done(chan);
4859 }
4860 }
4861
4862 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4863
4864 l2cap_chan_unlock(chan);
4865}
4866
4867static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
4868 struct l2cap_cmd_hdr *cmd,
4869 u16 cmd_len, void *data)
8d5a04a1
MM		 4870{
4871 struct l2cap_move_chan_rsp *rsp = data;
4872 u16 icid, result;
4873
4874 if (cmd_len != sizeof(*rsp))
4875 return -EPROTO;
4876
4877 icid = le16_to_cpu(rsp->icid);
4878 result = le16_to_cpu(rsp->result);
4879
ad0ac6ca 4880 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 4881
5b155ef9
MM		 4882 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
4883 l2cap_move_continue(conn, icid, result);
4884 else
4885 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 4886
4887 return 0;
4888}
4889
5f3847a4
MM		 4890static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
4891 struct l2cap_cmd_hdr *cmd,
4892 u16 cmd_len, void *data)
8d5a04a1
MM		 4893{
4894 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 4895 struct l2cap_chan *chan;
8d5a04a1
MM		 4896 u16 icid, result;
4897
4898 if (cmd_len != sizeof(*cfm))
4899 return -EPROTO;
4900
4901 icid = le16_to_cpu(cfm->icid);
4902 result = le16_to_cpu(cfm->result);
4903
ad0ac6ca 4904 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 4905
5f3847a4
MM		 4906 chan = l2cap_get_chan_by_dcid(conn, icid);
4907 if (!chan) {
4908 /* Spec requires a response even if the icid was not found */
4909 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4910 return 0;
4911 }
4912
4913 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
4914 if (result == L2CAP_MC_CONFIRMED) {
4915 chan->local_amp_id = chan->move_id;
4916 if (!chan->local_amp_id)
4917 __release_logical_link(chan);
4918 } else {
4919 chan->move_id = chan->local_amp_id;
4920 }
4921
4922 l2cap_move_done(chan);
4923 }
4924
8d5a04a1
MM		 4925 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
4926
5f3847a4
MM		 4927 l2cap_chan_unlock(chan);
4928
8d5a04a1
MM		 4929 return 0;
4930}
4931
4932static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 4933 struct l2cap_cmd_hdr *cmd,
4934 u16 cmd_len, void *data)
8d5a04a1
MM		 4935{
4936 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 4937 struct l2cap_chan *chan;
8d5a04a1
MM		 4938 u16 icid;
4939
4940 if (cmd_len != sizeof(*rsp))
4941 return -EPROTO;
4942
4943 icid = le16_to_cpu(rsp->icid);
4944
ad0ac6ca 4945 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 4946
3fd71a0a
MM		 4947 chan = l2cap_get_chan_by_scid(conn, icid);
4948 if (!chan)
4949 return 0;
4950
4951 __clear_chan_timer(chan);
4952
4953 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
4954 chan->local_amp_id = chan->move_id;
4955
4956 if (!chan->local_amp_id && chan->hs_hchan)
4957 __release_logical_link(chan);
4958
4959 l2cap_move_done(chan);
4960 }
4961
4962 l2cap_chan_unlock(chan);
4963
8d5a04a1
MM		 4964 return 0;
4965}
4966
e2174ca4 4967static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 4968 u16 to_multiplier)
de73115a
CT		 4969{
4970 u16 max_latency;
4971
4972 if (min > max || min < 6 || max > 3200)
4973 return -EINVAL;
4974
4975 if (to_multiplier < 10 || to_multiplier > 3200)
4976 return -EINVAL;
4977
4978 if (max >= to_multiplier * 8)
4979 return -EINVAL;
4980
4981 max_latency = (to_multiplier * 8 / max) - 1;
4982 if (latency > 499 || latency > max_latency)
4983 return -EINVAL;
4984
4985 return 0;
4986}
4987
4988static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818
GP		 4989 struct l2cap_cmd_hdr *cmd,
4990 u8 *data)
de73115a
CT		 4991{
4992 struct hci_conn *hcon = conn->hcon;
4993 struct l2cap_conn_param_update_req *req;
4994 struct l2cap_conn_param_update_rsp rsp;
4995 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 4996 int err;
de73115a
CT		 4997
4998 if (!(hcon->link_mode & HCI_LM_MASTER))
4999 return -EINVAL;
5000
5001 cmd_len = __le16_to_cpu(cmd->len);
5002 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5003 return -EPROTO;
5004
5005 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5006 min = __le16_to_cpu(req->min);
5007 max = __le16_to_cpu(req->max);
de73115a
CT		 5008 latency = __le16_to_cpu(req->latency);
5009 to_multiplier = __le16_to_cpu(req->to_multiplier);
5010
5011 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5012 min, max, latency, to_multiplier);
de73115a
CT		 5013
5014 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5015
5016 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5017 if (err)
ac73498c 5018 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5019 else
ac73498c 5020 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5021
5022 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5023 sizeof(rsp), &rsp);
de73115a 5024
2ce603eb
CT		 5025 if (!err)
5026 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5027
de73115a
CT		 5028 return 0;
5029}
5030
3300d9a9 5031static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5032 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5033 u8 *data)
3300d9a9
CT		 5034{
5035 int err = 0;
5036
5037 switch (cmd->code) {
5038 case L2CAP_COMMAND_REJ:
5039 l2cap_command_rej(conn, cmd, data);
5040 break;
5041
5042 case L2CAP_CONN_REQ:
5043 err = l2cap_connect_req(conn, cmd, data);
5044 break;
5045
5046 case L2CAP_CONN_RSP:
f5a2598d 5047 case L2CAP_CREATE_CHAN_RSP:
5909cf30 5048 err = l2cap_connect_create_rsp(conn, cmd, data);
3300d9a9
CT		 5049 break;
5050
5051 case L2CAP_CONF_REQ:
5052 err = l2cap_config_req(conn, cmd, cmd_len, data);
5053 break;
5054
5055 case L2CAP_CONF_RSP:
5056 err = l2cap_config_rsp(conn, cmd, data);
5057 break;
5058
5059 case L2CAP_DISCONN_REQ:
5060 err = l2cap_disconnect_req(conn, cmd, data);
5061 break;
5062
5063 case L2CAP_DISCONN_RSP:
5064 err = l2cap_disconnect_rsp(conn, cmd, data);
5065 break;
5066
5067 case L2CAP_ECHO_REQ:
5068 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5069 break;
5070
5071 case L2CAP_ECHO_RSP:
5072 break;
5073
5074 case L2CAP_INFO_REQ:
5075 err = l2cap_information_req(conn, cmd, data);
5076 break;
5077
5078 case L2CAP_INFO_RSP:
5079 err = l2cap_information_rsp(conn, cmd, data);
5080 break;
5081
f94ff6ff
MM		 5082 case L2CAP_CREATE_CHAN_REQ:
5083 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5084 break;
5085
8d5a04a1
MM		 5086 case L2CAP_MOVE_CHAN_REQ:
5087 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5088 break;
5089
5090 case L2CAP_MOVE_CHAN_RSP:
5091 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5092 break;
5093
5094 case L2CAP_MOVE_CHAN_CFM:
5095 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5096 break;
5097
5098 case L2CAP_MOVE_CHAN_CFM_RSP:
5099 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5100 break;
5101
3300d9a9
CT		 5102 default:
5103 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5104 err = -EINVAL;
5105 break;
5106 }
5107
5108 return err;
5109}
5110
5111static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2d792818 5112 struct l2cap_cmd_hdr *cmd, u8 *data)
3300d9a9
CT		 5113{
5114 switch (cmd->code) {
5115 case L2CAP_COMMAND_REJ:
5116 return 0;
5117
5118 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 5119 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 5120
5121 case L2CAP_CONN_PARAM_UPDATE_RSP:
5122 return 0;
5123
5124 default:
5125 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5126 return -EINVAL;
5127 }
5128}
5129
5130static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5131 struct sk_buff *skb)
1da177e4
LT		 5132{
5133 u8 *data = skb->data;
5134 int len = skb->len;
5135 struct l2cap_cmd_hdr cmd;
3300d9a9 5136 int err;
1da177e4
LT		 5137
5138 l2cap_raw_recv(conn, skb);
5139
5140 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5141 u16 cmd_len;
1da177e4
LT		 5142 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5143 data += L2CAP_CMD_HDR_SIZE;
5144 len -= L2CAP_CMD_HDR_SIZE;
5145
88219a0f 5146 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5147
2d792818
GP		 5148 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5149 cmd.ident);
1da177e4 5150
88219a0f 5151 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5152 BT_DBG("corrupted command");
5153 break;
5154 }
5155
3300d9a9
CT		 5156 if (conn->hcon->type == LE_LINK)
5157 err = l2cap_le_sig_cmd(conn, &cmd, data);
5158 else
5159 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 5160
5161 if (err) {
e2fd318e 5162 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5163
5164 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 5165
5166 /* FIXME: Map err to a valid reason */
ac73498c 5167 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5168 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5169 sizeof(rej), &rej);
1da177e4
LT		 5170 }
5171
88219a0f
AV		 5172 data += cmd_len;
5173 len -= cmd_len;
1da177e4
LT		 5174 }
5175
5176 kfree_skb(skb);
5177}
5178
47d1ec61 5179static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5180{
5181 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5182 int hdr_size;
5183
5184 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5185 hdr_size = L2CAP_EXT_HDR_SIZE;
5186 else
5187 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5188
47d1ec61 5189 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5190 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5191 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5192 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5193
5194 if (our_fcs != rcv_fcs)
7a560e5c 5195 return -EBADMSG;
fcc203c3
GP		 5196 }
5197 return 0;
5198}
5199
6ea00485 5200static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5201{
e31f7633 5202 struct l2cap_ctrl control;
d5392c8f 5203
e31f7633 5204 BT_DBG("chan %p", chan);
d5392c8f 5205
e31f7633
MM		 5206 memset(&control, 0, sizeof(control));
5207 control.sframe = 1;
5208 control.final = 1;
5209 control.reqseq = chan->buffer_seq;
5210 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5211
e2ab4353 5212 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5213 control.super = L2CAP_SUPER_RNR;
5214 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5215 }
5216
e31f7633
MM		 5217 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5218 chan->unacked_frames > 0)
5219 __set_retrans_timer(chan);
d5392c8f 5220
e31f7633 5221 /* Send pending iframes */
525cd185 5222 l2cap_ertm_send(chan);
d5392c8f 5223
e2ab4353 5224 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5225 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5226 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5227 * send it now.
5228 */
5229 control.super = L2CAP_SUPER_RR;
5230 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5231 }
5232}
5233
2d792818
GP		 5234static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5235 struct sk_buff **last_frag)
18778a63 5236{
84084a31
MM		 5237 /* skb->len reflects data in skb as well as all fragments
5238 * skb->data_len reflects only data in fragments
5239 */
5240 if (!skb_has_frag_list(skb))
5241 skb_shinfo(skb)->frag_list = new_frag;
5242
5243 new_frag->next = NULL;
5244
5245 (*last_frag)->next = new_frag;
5246 *last_frag = new_frag;
5247
5248 skb->len += new_frag->len;
5249 skb->data_len += new_frag->len;
5250 skb->truesize += new_frag->truesize;
5251}
5252
4b51dae9
MM		 5253static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5254 struct l2cap_ctrl *control)
84084a31
MM		 5255{
5256 int err = -EINVAL;
18778a63 5257
4b51dae9 5258 switch (control->sar) {
7e0ef6ee 5259 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5260 if (chan->sdu)
5261 break;
18778a63 5262
80b98027 5263 err = chan->ops->recv(chan, skb);
84084a31 5264 break;
18778a63 5265
7e0ef6ee 5266 case L2CAP_SAR_START:
84084a31
MM		 5267 if (chan->sdu)
5268 break;
18778a63 5269
6f61fd47 5270 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5271 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5272
84084a31
MM		 5273 if (chan->sdu_len > chan->imtu) {
5274 err = -EMSGSIZE;
5275 break;
5276 }
1890d36b 5277
84084a31
MM		 5278 if (skb->len >= chan->sdu_len)
5279 break;
18778a63 5280
84084a31
MM		 5281 chan->sdu = skb;
5282 chan->sdu_last_frag = skb;
18778a63 5283
84084a31
MM		 5284 skb = NULL;
5285 err = 0;
18778a63
GP		 5286 break;
5287
7e0ef6ee 5288 case L2CAP_SAR_CONTINUE:
6f61fd47 5289 if (!chan->sdu)
84084a31 5290 break;
18778a63 5291
84084a31
MM		 5292 append_skb_frag(chan->sdu, skb,
5293 &chan->sdu_last_frag);
5294 skb = NULL;
18778a63 5295
84084a31
MM		 5296 if (chan->sdu->len >= chan->sdu_len)
5297 break;
4178ba46 5298
84084a31 5299 err = 0;
18778a63
GP		 5300 break;
5301
7e0ef6ee 5302 case L2CAP_SAR_END:
6f61fd47 5303 if (!chan->sdu)
84084a31 5304 break;
18778a63 5305
84084a31
MM		 5306 append_skb_frag(chan->sdu, skb,
5307 &chan->sdu_last_frag);
5308 skb = NULL;
4178ba46 5309
84084a31
MM		 5310 if (chan->sdu->len != chan->sdu_len)
5311 break;
18778a63 5312
80b98027 5313 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5314
84084a31
MM		 5315 if (!err) {
5316 /* Reassembly complete */
5317 chan->sdu = NULL;
5318 chan->sdu_last_frag = NULL;
5319 chan->sdu_len = 0;
1890d36b 5320 }
18778a63
GP		 5321 break;
5322 }
5323
84084a31
MM		 5324 if (err) {
5325 kfree_skb(skb);
5326 kfree_skb(chan->sdu);
5327 chan->sdu = NULL;
5328 chan->sdu_last_frag = NULL;
5329 chan->sdu_len = 0;
5330 }
18778a63 5331
84084a31 5332 return err;
18778a63
GP		 5333}
5334
32b32735
MM		 5335static int l2cap_resegment(struct l2cap_chan *chan)
5336{
5337 /* Placeholder */
5338 return 0;
5339}
5340
61aa4f5b 5341void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5342{
61aa4f5b 5343 u8 event;
712132eb 5344
61aa4f5b
MM		 5345 if (chan->mode != L2CAP_MODE_ERTM)
5346 return;
712132eb 5347
61aa4f5b 5348 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5349 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5350}
5351
d2a7ac5d
MM		 5352static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5353{
63838725
MM		 5354 int err = 0;
5355 /* Pass sequential frames to l2cap_reassemble_sdu()
5356 * until a gap is encountered.
5357 */
5358
5359 BT_DBG("chan %p", chan);
5360
5361 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5362 struct sk_buff *skb;
5363 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5364 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5365
5366 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5367
5368 if (!skb)
5369 break;
5370
5371 skb_unlink(skb, &chan->srej_q);
5372 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5373 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5374 if (err)
5375 break;
5376 }
5377
5378 if (skb_queue_empty(&chan->srej_q)) {
5379 chan->rx_state = L2CAP_RX_STATE_RECV;
5380 l2cap_send_ack(chan);
5381 }
5382
5383 return err;
d2a7ac5d
MM		 5384}
5385
5386static void l2cap_handle_srej(struct l2cap_chan *chan,
5387 struct l2cap_ctrl *control)
5388{
f80842a8
MM		 5389 struct sk_buff *skb;
5390
5391 BT_DBG("chan %p, control %p", chan, control);
5392
5393 if (control->reqseq == chan->next_tx_seq) {
5394 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5395 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
5396 return;
5397 }
5398
5399 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5400
5401 if (skb == NULL) {
5402 BT_DBG("Seq %d not available for retransmission",
5403 control->reqseq);
5404 return;
5405 }
5406
5407 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5408 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5409 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
5410 return;
5411 }
5412
5413 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5414
5415 if (control->poll) {
5416 l2cap_pass_to_tx(chan, control);
5417
5418 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5419 l2cap_retransmit(chan, control);
5420 l2cap_ertm_send(chan);
5421
5422 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5423 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5424 chan->srej_save_reqseq = control->reqseq;
5425 }
5426 } else {
5427 l2cap_pass_to_tx_fbit(chan, control);
5428
5429 if (control->final) {
5430 if (chan->srej_save_reqseq != control->reqseq ||
5431 !test_and_clear_bit(CONN_SREJ_ACT,
5432 &chan->conn_state))
5433 l2cap_retransmit(chan, control);
5434 } else {
5435 l2cap_retransmit(chan, control);
5436 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5437 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5438 chan->srej_save_reqseq = control->reqseq;
5439 }
5440 }
5441 }
d2a7ac5d
MM		 5442}
5443
5444static void l2cap_handle_rej(struct l2cap_chan *chan,
5445 struct l2cap_ctrl *control)
5446{
fcd289df
MM		 5447 struct sk_buff *skb;
5448
5449 BT_DBG("chan %p, control %p", chan, control);
5450
5451 if (control->reqseq == chan->next_tx_seq) {
5452 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5453 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
5454 return;
5455 }
5456
5457 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5458
5459 if (chan->max_tx && skb &&
5460 bt_cb(skb)->control.retries >= chan->max_tx) {
5461 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5462 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
5463 return;
5464 }
5465
5466 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5467
5468 l2cap_pass_to_tx(chan, control);
5469
5470 if (control->final) {
5471 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5472 l2cap_retransmit_all(chan, control);
5473 } else {
5474 l2cap_retransmit_all(chan, control);
5475 l2cap_ertm_send(chan);
5476 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5477 set_bit(CONN_REJ_ACT, &chan->conn_state);
5478 }
d2a7ac5d
MM		 5479}
5480
4b51dae9
MM		 5481static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5482{
5483 BT_DBG("chan %p, txseq %d", chan, txseq);
5484
5485 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5486 chan->expected_tx_seq);
5487
5488 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5489 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5490 chan->tx_win) {
4b51dae9
MM		 5491 /* See notes below regarding "double poll" and
5492 * invalid packets.
5493 */
5494 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5495 BT_DBG("Invalid/Ignore - after SREJ");
5496 return L2CAP_TXSEQ_INVALID_IGNORE;
5497 } else {
5498 BT_DBG("Invalid - in window after SREJ sent");
5499 return L2CAP_TXSEQ_INVALID;
5500 }
5501 }
5502
5503 if (chan->srej_list.head == txseq) {
5504 BT_DBG("Expected SREJ");
5505 return L2CAP_TXSEQ_EXPECTED_SREJ;
5506 }
5507
5508 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5509 BT_DBG("Duplicate SREJ - txseq already stored");
5510 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5511 }
5512
5513 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5514 BT_DBG("Unexpected SREJ - not requested");
5515 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5516 }
5517 }
5518
5519 if (chan->expected_tx_seq == txseq) {
5520 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5521 chan->tx_win) {
5522 BT_DBG("Invalid - txseq outside tx window");
5523 return L2CAP_TXSEQ_INVALID;
5524 } else {
5525 BT_DBG("Expected");
5526 return L2CAP_TXSEQ_EXPECTED;
5527 }
5528 }
5529
5530 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 5531 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 5532 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5533 return L2CAP_TXSEQ_DUPLICATE;
5534 }
5535
5536 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5537 /* A source of invalid packets is a "double poll" condition,
5538 * where delays cause us to send multiple poll packets. If
5539 * the remote stack receives and processes both polls,
5540 * sequence numbers can wrap around in such a way that a
5541 * resent frame has a sequence number that looks like new data
5542 * with a sequence gap. This would trigger an erroneous SREJ
5543 * request.
5544 *
5545 * Fortunately, this is impossible with a tx window that's
5546 * less than half of the maximum sequence number, which allows
5547 * invalid frames to be safely ignored.
5548 *
5549 * With tx window sizes greater than half of the tx window
5550 * maximum, the frame is invalid and cannot be ignored. This
5551 * causes a disconnect.
5552 */
5553
5554 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5555 BT_DBG("Invalid/Ignore - txseq outside tx window");
5556 return L2CAP_TXSEQ_INVALID_IGNORE;
5557 } else {
5558 BT_DBG("Invalid - txseq outside tx window");
5559 return L2CAP_TXSEQ_INVALID;
5560 }
5561 } else {
5562 BT_DBG("Unexpected - txseq indicates missing frames");
5563 return L2CAP_TXSEQ_UNEXPECTED;
5564 }
5565}
5566
d2a7ac5d
MM		 5567static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5568 struct l2cap_ctrl *control,
5569 struct sk_buff *skb, u8 event)
5570{
5571 int err = 0;
5572 bool skb_in_use = 0;
5573
5574 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5575 event);
5576
5577 switch (event) {
5578 case L2CAP_EV_RECV_IFRAME:
5579 switch (l2cap_classify_txseq(chan, control->txseq)) {
5580 case L2CAP_TXSEQ_EXPECTED:
5581 l2cap_pass_to_tx(chan, control);
5582
5583 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5584 BT_DBG("Busy, discarding expected seq %d",
5585 control->txseq);
5586 break;
5587 }
5588
5589 chan->expected_tx_seq = __next_seq(chan,
5590 control->txseq);
5591
5592 chan->buffer_seq = chan->expected_tx_seq;
5593 skb_in_use = 1;
5594
5595 err = l2cap_reassemble_sdu(chan, skb, control);
5596 if (err)
5597 break;
5598
5599 if (control->final) {
5600 if (!test_and_clear_bit(CONN_REJ_ACT,
5601 &chan->conn_state)) {
5602 control->final = 0;
5603 l2cap_retransmit_all(chan, control);
5604 l2cap_ertm_send(chan);
5605 }
5606 }
5607
5608 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5609 l2cap_send_ack(chan);
5610 break;
5611 case L2CAP_TXSEQ_UNEXPECTED:
5612 l2cap_pass_to_tx(chan, control);
5613
5614 /* Can't issue SREJ frames in the local busy state.
5615 * Drop this frame, it will be seen as missing
5616 * when local busy is exited.
5617 */
5618 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5619 BT_DBG("Busy, discarding unexpected seq %d",
5620 control->txseq);
5621 break;
5622 }
5623
5624 /* There was a gap in the sequence, so an SREJ
5625 * must be sent for each missing frame. The
5626 * current frame is stored for later use.
5627 */
5628 skb_queue_tail(&chan->srej_q, skb);
5629 skb_in_use = 1;
5630 BT_DBG("Queued %p (queue len %d)", skb,
5631 skb_queue_len(&chan->srej_q));
5632
5633 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5634 l2cap_seq_list_clear(&chan->srej_list);
5635 l2cap_send_srej(chan, control->txseq);
5636
5637 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5638 break;
5639 case L2CAP_TXSEQ_DUPLICATE:
5640 l2cap_pass_to_tx(chan, control);
5641 break;
5642 case L2CAP_TXSEQ_INVALID_IGNORE:
5643 break;
5644 case L2CAP_TXSEQ_INVALID:
5645 default:
5646 l2cap_send_disconn_req(chan->conn, chan,
5647 ECONNRESET);
5648 break;
5649 }
5650 break;
5651 case L2CAP_EV_RECV_RR:
5652 l2cap_pass_to_tx(chan, control);
5653 if (control->final) {
5654 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5655
e6a3ee6e
MM		 5656 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5657 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 5658 control->final = 0;
5659 l2cap_retransmit_all(chan, control);
5660 }
5661
5662 l2cap_ertm_send(chan);
5663 } else if (control->poll) {
5664 l2cap_send_i_or_rr_or_rnr(chan);
5665 } else {
5666 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5667 &chan->conn_state) &&
5668 chan->unacked_frames)
5669 __set_retrans_timer(chan);
5670
5671 l2cap_ertm_send(chan);
5672 }
5673 break;
5674 case L2CAP_EV_RECV_RNR:
5675 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5676 l2cap_pass_to_tx(chan, control);
5677 if (control && control->poll) {
5678 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5679 l2cap_send_rr_or_rnr(chan, 0);
5680 }
5681 __clear_retrans_timer(chan);
5682 l2cap_seq_list_clear(&chan->retrans_list);
5683 break;
5684 case L2CAP_EV_RECV_REJ:
5685 l2cap_handle_rej(chan, control);
5686 break;
5687 case L2CAP_EV_RECV_SREJ:
5688 l2cap_handle_srej(chan, control);
5689 break;
5690 default:
5691 break;
5692 }
5693
5694 if (skb && !skb_in_use) {
5695 BT_DBG("Freeing %p", skb);
5696 kfree_skb(skb);
5697 }
5698
5699 return err;
5700}
5701
5702static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5703 struct l2cap_ctrl *control,
5704 struct sk_buff *skb, u8 event)
5705{
5706 int err = 0;
5707 u16 txseq = control->txseq;
5708 bool skb_in_use = 0;
5709
5710 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5711 event);
5712
5713 switch (event) {
5714 case L2CAP_EV_RECV_IFRAME:
5715 switch (l2cap_classify_txseq(chan, txseq)) {
5716 case L2CAP_TXSEQ_EXPECTED:
5717 /* Keep frame for reassembly later */
5718 l2cap_pass_to_tx(chan, control);
5719 skb_queue_tail(&chan->srej_q, skb);
5720 skb_in_use = 1;
5721 BT_DBG("Queued %p (queue len %d)", skb,
5722 skb_queue_len(&chan->srej_q));
5723
5724 chan->expected_tx_seq = __next_seq(chan, txseq);
5725 break;
5726 case L2CAP_TXSEQ_EXPECTED_SREJ:
5727 l2cap_seq_list_pop(&chan->srej_list);
5728
5729 l2cap_pass_to_tx(chan, control);
5730 skb_queue_tail(&chan->srej_q, skb);
5731 skb_in_use = 1;
5732 BT_DBG("Queued %p (queue len %d)", skb,
5733 skb_queue_len(&chan->srej_q));
5734
5735 err = l2cap_rx_queued_iframes(chan);
5736 if (err)
5737 break;
5738
5739 break;
5740 case L2CAP_TXSEQ_UNEXPECTED:
5741 /* Got a frame that can't be reassembled yet.
5742 * Save it for later, and send SREJs to cover
5743 * the missing frames.
5744 */
5745 skb_queue_tail(&chan->srej_q, skb);
5746 skb_in_use = 1;
5747 BT_DBG("Queued %p (queue len %d)", skb,
5748 skb_queue_len(&chan->srej_q));
5749
5750 l2cap_pass_to_tx(chan, control);
5751 l2cap_send_srej(chan, control->txseq);
5752 break;
5753 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5754 /* This frame was requested with an SREJ, but
5755 * some expected retransmitted frames are
5756 * missing. Request retransmission of missing
5757 * SREJ'd frames.
5758 */
5759 skb_queue_tail(&chan->srej_q, skb);
5760 skb_in_use = 1;
5761 BT_DBG("Queued %p (queue len %d)", skb,
5762 skb_queue_len(&chan->srej_q));
5763
5764 l2cap_pass_to_tx(chan, control);
5765 l2cap_send_srej_list(chan, control->txseq);
5766 break;
5767 case L2CAP_TXSEQ_DUPLICATE_SREJ:
5768 /* We've already queued this frame. Drop this copy. */
5769 l2cap_pass_to_tx(chan, control);
5770 break;
5771 case L2CAP_TXSEQ_DUPLICATE:
5772 /* Expecting a later sequence number, so this frame
5773 * was already received. Ignore it completely.
5774 */
5775 break;
5776 case L2CAP_TXSEQ_INVALID_IGNORE:
5777 break;
5778 case L2CAP_TXSEQ_INVALID:
5779 default:
5780 l2cap_send_disconn_req(chan->conn, chan,
5781 ECONNRESET);
5782 break;
5783 }
5784 break;
5785 case L2CAP_EV_RECV_RR:
5786 l2cap_pass_to_tx(chan, control);
5787 if (control->final) {
5788 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5789
5790 if (!test_and_clear_bit(CONN_REJ_ACT,
5791 &chan->conn_state)) {
5792 control->final = 0;
5793 l2cap_retransmit_all(chan, control);
5794 }
5795
5796 l2cap_ertm_send(chan);
5797 } else if (control->poll) {
5798 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5799 &chan->conn_state) &&
5800 chan->unacked_frames) {
5801 __set_retrans_timer(chan);
5802 }
5803
5804 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5805 l2cap_send_srej_tail(chan);
5806 } else {
5807 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5808 &chan->conn_state) &&
5809 chan->unacked_frames)
5810 __set_retrans_timer(chan);
5811
5812 l2cap_send_ack(chan);
5813 }
5814 break;
5815 case L2CAP_EV_RECV_RNR:
5816 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5817 l2cap_pass_to_tx(chan, control);
5818 if (control->poll) {
5819 l2cap_send_srej_tail(chan);
5820 } else {
5821 struct l2cap_ctrl rr_control;
5822 memset(&rr_control, 0, sizeof(rr_control));
5823 rr_control.sframe = 1;
5824 rr_control.super = L2CAP_SUPER_RR;
5825 rr_control.reqseq = chan->buffer_seq;
5826 l2cap_send_sframe(chan, &rr_control);
5827 }
5828
5829 break;
5830 case L2CAP_EV_RECV_REJ:
5831 l2cap_handle_rej(chan, control);
5832 break;
5833 case L2CAP_EV_RECV_SREJ:
5834 l2cap_handle_srej(chan, control);
5835 break;
5836 }
5837
5838 if (skb && !skb_in_use) {
5839 BT_DBG("Freeing %p", skb);
5840 kfree_skb(skb);
5841 }
5842
5843 return err;
5844}
5845
32b32735
MM		 5846static int l2cap_finish_move(struct l2cap_chan *chan)
5847{
5848 BT_DBG("chan %p", chan);
5849
5850 chan->rx_state = L2CAP_RX_STATE_RECV;
5851
5852 if (chan->hs_hcon)
5853 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
5854 else
5855 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
5856
5857 return l2cap_resegment(chan);
5858}
5859
5860static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
5861 struct l2cap_ctrl *control,
5862 struct sk_buff *skb, u8 event)
5863{
5864 int err;
5865
5866 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5867 event);
5868
5869 if (!control->poll)
5870 return -EPROTO;
5871
5872 l2cap_process_reqseq(chan, control->reqseq);
5873
5874 if (!skb_queue_empty(&chan->tx_q))
5875 chan->tx_send_head = skb_peek(&chan->tx_q);
5876 else
5877 chan->tx_send_head = NULL;
5878
5879 /* Rewind next_tx_seq to the point expected
5880 * by the receiver.
5881 */
5882 chan->next_tx_seq = control->reqseq;
5883 chan->unacked_frames = 0;
5884
5885 err = l2cap_finish_move(chan);
5886 if (err)
5887 return err;
5888
5889 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5890 l2cap_send_i_or_rr_or_rnr(chan);
5891
5892 if (event == L2CAP_EV_RECV_IFRAME)
5893 return -EPROTO;
5894
5895 return l2cap_rx_state_recv(chan, control, NULL, event);
5896}
5897
5898static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
5899 struct l2cap_ctrl *control,
5900 struct sk_buff *skb, u8 event)
5901{
5902 int err;
5903
5904 if (!control->final)
5905 return -EPROTO;
5906
5907 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5908
5909 chan->rx_state = L2CAP_RX_STATE_RECV;
5910 l2cap_process_reqseq(chan, control->reqseq);
5911
5912 if (!skb_queue_empty(&chan->tx_q))
5913 chan->tx_send_head = skb_peek(&chan->tx_q);
5914 else
5915 chan->tx_send_head = NULL;
5916
5917 /* Rewind next_tx_seq to the point expected
5918 * by the receiver.
5919 */
5920 chan->next_tx_seq = control->reqseq;
5921 chan->unacked_frames = 0;
5922
5923 if (chan->hs_hcon)
5924 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
5925 else
5926 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
5927
5928 err = l2cap_resegment(chan);
5929
5930 if (!err)
5931 err = l2cap_rx_state_recv(chan, control, skb, event);
5932
5933 return err;
5934}
5935
d2a7ac5d
MM		 5936static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
5937{
5938 /* Make sure reqseq is for a packet that has been sent but not acked */
5939 u16 unacked;
5940
5941 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
5942 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
5943}
5944
cec8ab6e
MM		 5945static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5946 struct sk_buff *skb, u8 event)
218bb9df 5947{
d2a7ac5d
MM		 5948 int err = 0;
5949
5950 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
5951 control, skb, event, chan->rx_state);
5952
5953 if (__valid_reqseq(chan, control->reqseq)) {
5954 switch (chan->rx_state) {
5955 case L2CAP_RX_STATE_RECV:
5956 err = l2cap_rx_state_recv(chan, control, skb, event);
5957 break;
5958 case L2CAP_RX_STATE_SREJ_SENT:
5959 err = l2cap_rx_state_srej_sent(chan, control, skb,
5960 event);
5961 break;
32b32735
MM		 5962 case L2CAP_RX_STATE_WAIT_P:
5963 err = l2cap_rx_state_wait_p(chan, control, skb, event);
5964 break;
5965 case L2CAP_RX_STATE_WAIT_F:
5966 err = l2cap_rx_state_wait_f(chan, control, skb, event);
5967 break;
d2a7ac5d
MM		 5968 default:
5969 /* shut it down */
5970 break;
5971 }
5972 } else {
5973 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
5974 control->reqseq, chan->next_tx_seq,
5975 chan->expected_ack_seq);
5976 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
5977 }
5978
5979 return err;
cec8ab6e
MM		 5980}
5981
5982static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
5983 struct sk_buff *skb)
5984{
4b51dae9
MM		 5985 int err = 0;
5986
5987 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
5988 chan->rx_state);
5989
5990 if (l2cap_classify_txseq(chan, control->txseq) ==
5991 L2CAP_TXSEQ_EXPECTED) {
5992 l2cap_pass_to_tx(chan, control);
5993
5994 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
5995 __next_seq(chan, chan->buffer_seq));
5996
5997 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5998
5999 l2cap_reassemble_sdu(chan, skb, control);
6000 } else {
6001 if (chan->sdu) {
6002 kfree_skb(chan->sdu);
6003 chan->sdu = NULL;
6004 }
6005 chan->sdu_last_frag = NULL;
6006 chan->sdu_len = 0;
6007
6008 if (skb) {
6009 BT_DBG("Freeing %p", skb);
6010 kfree_skb(skb);
6011 }
6012 }
6013
6014 chan->last_acked_seq = control->txseq;
6015 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6016
6017 return err;
cec8ab6e
MM		 6018}
6019
6020static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6021{
6022 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6023 u16 len;
6024 u8 event;
218bb9df 6025
b76bbd66
MM		 6026 __unpack_control(chan, skb);
6027
218bb9df
GP		 6028 len = skb->len;
6029
6030 /*
6031 * We can just drop the corrupted I-frame here.
6032 * Receiver will miss it and start proper recovery
cec8ab6e 6033 * procedures and ask for retransmission.
218bb9df 6034 */
47d1ec61 6035 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6036 goto drop;
6037
cec8ab6e 6038 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6039 len -= L2CAP_SDULEN_SIZE;
218bb9df 6040
47d1ec61 6041 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6042 len -= L2CAP_FCS_SIZE;
218bb9df 6043
47d1ec61 6044 if (len > chan->mps) {
8c1d787b 6045 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 6046 goto drop;
6047 }
6048
cec8ab6e
MM		 6049 if (!control->sframe) {
6050 int err;
218bb9df 6051
cec8ab6e
MM		 6052 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6053 control->sar, control->reqseq, control->final,
6054 control->txseq);
218bb9df 6055
cec8ab6e
MM		 6056 /* Validate F-bit - F=0 always valid, F=1 only
6057 * valid in TX WAIT_F
6058 */
6059 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6060 goto drop;
cec8ab6e
MM		 6061
6062 if (chan->mode != L2CAP_MODE_STREAMING) {
6063 event = L2CAP_EV_RECV_IFRAME;
6064 err = l2cap_rx(chan, control, skb, event);
6065 } else {
6066 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6067 }
6068
cec8ab6e
MM		 6069 if (err)
6070 l2cap_send_disconn_req(chan->conn, chan,
6071 ECONNRESET);
218bb9df 6072 } else {
cec8ab6e
MM		 6073 const u8 rx_func_to_event[4] = {
6074 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6075 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6076 };
6077
6078 /* Only I-frames are expected in streaming mode */
6079 if (chan->mode == L2CAP_MODE_STREAMING)
6080 goto drop;
6081
6082 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6083 control->reqseq, control->final, control->poll,
6084 control->super);
6085
218bb9df
GP		 6086 if (len != 0) {
6087 BT_ERR("%d", len);
8c1d787b 6088 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 6089 goto drop;
6090 }
6091
cec8ab6e
MM		 6092 /* Validate F and P bits */
6093 if (control->final && (control->poll ||
6094 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6095 goto drop;
6096
6097 event = rx_func_to_event[control->super];
6098 if (l2cap_rx(chan, control, skb, event))
6099 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 6100 }
6101
6102 return 0;
6103
6104drop:
6105 kfree_skb(skb);
6106 return 0;
6107}
6108
13ca56e0
AE		 6109static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6110 struct sk_buff *skb)
1da177e4 6111{
48454079 6112 struct l2cap_chan *chan;
1da177e4 6113
baa7e1fa 6114 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6115 if (!chan) {
97e8e89d
AE		 6116 if (cid == L2CAP_CID_A2MP) {
6117 chan = a2mp_channel_create(conn, skb);
6118 if (!chan) {
6119 kfree_skb(skb);
13ca56e0 6120 return;
97e8e89d
AE		 6121 }
6122
6123 l2cap_chan_lock(chan);
6124 } else {
6125 BT_DBG("unknown cid 0x%4.4x", cid);
6126 /* Drop packet and return */
6127 kfree_skb(skb);
13ca56e0 6128 return;
97e8e89d 6129 }
1da177e4
LT		 6130 }
6131
49208c9c 6132 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6133
89bc500e 6134 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6135 goto drop;
6136
0c1bc5c6 6137 switch (chan->mode) {
1c2acffb
GP		 6138 case L2CAP_MODE_BASIC:
6139 /* If socket recv buffers overflows we drop data here
6140 * which is *bad* because L2CAP has to be reliable.
6141 * But we don't have any other choice. L2CAP doesn't
6142 * provide flow control mechanism. */
1da177e4 6143
0c1bc5c6 6144 if (chan->imtu < skb->len)
1c2acffb 6145 goto drop;
1da177e4 6146
80b98027 6147 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6148 goto done;
6149 break;
6150
6151 case L2CAP_MODE_ERTM:
6840ed07 6152 case L2CAP_MODE_STREAMING:
cec8ab6e 6153 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6154 goto done;
6155
1c2acffb 6156 default:
0c1bc5c6 6157 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6158 break;
6159 }
1da177e4
LT		 6160
6161drop:
6162 kfree_skb(skb);
6163
6164done:
6be36555 6165 l2cap_chan_unlock(chan);
1da177e4
LT		 6166}
6167
84104b24
AE		 6168static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6169 struct sk_buff *skb)
1da177e4 6170{
23691d75 6171 struct l2cap_chan *chan;
1da177e4 6172
c2287681 6173 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
23691d75 6174 if (!chan)
1da177e4
LT		 6175 goto drop;
6176
5b4cedaa 6177 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6178
89bc500e 6179 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6180 goto drop;
6181
e13e21dc 6182 if (chan->imtu < skb->len)
1da177e4
LT		 6183 goto drop;
6184
80b98027 6185 if (!chan->ops->recv(chan, skb))
84104b24 6186 return;
1da177e4
LT		 6187
6188drop:
6189 kfree_skb(skb);
1da177e4
LT		 6190}
6191
6810fca7
AE		 6192static void l2cap_att_channel(struct l2cap_conn *conn, u16 cid,
6193 struct sk_buff *skb)
9f69bda6 6194{
23691d75 6195 struct l2cap_chan *chan;
9f69bda6 6196
c2287681 6197 chan = l2cap_global_chan_by_scid(0, cid, conn->src, conn->dst);
23691d75 6198 if (!chan)
9f69bda6
GP		 6199 goto drop;
6200
5b4cedaa 6201 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6202
89bc500e 6203 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 6204 goto drop;
6205
e13e21dc 6206 if (chan->imtu < skb->len)
9f69bda6
GP		 6207 goto drop;
6208
80b98027 6209 if (!chan->ops->recv(chan, skb))
6810fca7 6210 return;
9f69bda6
GP		 6211
6212drop:
6213 kfree_skb(skb);
9f69bda6
GP		 6214}
6215
1da177e4
LT		 6216static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6217{
6218 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 6219 u16 cid, len;
6220 __le16 psm;
1da177e4
LT		 6221
6222 skb_pull(skb, L2CAP_HDR_SIZE);
6223 cid = __le16_to_cpu(lh->cid);
6224 len = __le16_to_cpu(lh->len);
6225
1c2acffb
GP		 6226 if (len != skb->len) {
6227 kfree_skb(skb);
6228 return;
6229 }
6230
1da177e4
LT		 6231 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6232
6233 switch (cid) {
3300d9a9 6234 case L2CAP_CID_LE_SIGNALING:
8db4dc46 6235 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6236 l2cap_sig_channel(conn, skb);
6237 break;
6238
8db4dc46 6239 case L2CAP_CID_CONN_LESS:
097db76c 6240 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6241 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6242 l2cap_conless_channel(conn, psm, skb);
6243 break;
6244
9f69bda6
GP		 6245 case L2CAP_CID_LE_DATA:
6246 l2cap_att_channel(conn, cid, skb);
6247 break;
6248
b501d6a1
AB		 6249 case L2CAP_CID_SMP:
6250 if (smp_sig_channel(conn, skb))
6251 l2cap_conn_del(conn->hcon, EACCES);
6252 break;
6253
1da177e4
LT		 6254 default:
6255 l2cap_data_channel(conn, cid, skb);
6256 break;
6257 }
6258}
6259
6260/* ---- L2CAP interface with lower layer (HCI) ---- */
6261
686ebf28 6262int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 6263{
6264 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 6265 struct l2cap_chan *c;
1da177e4 6266
6ed93dc6 6267 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 6268
6269 /* Find listening sockets and check their link_mode */
23691d75
GP		 6270 read_lock(&chan_list_lock);
6271 list_for_each_entry(c, &chan_list, global_l) {
6272 struct sock *sk = c->sk;
4343478f 6273
89bc500e 6274 if (c->state != BT_LISTEN)
1da177e4
LT		 6275 continue;
6276
6277 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 6278 lm1 |= HCI_LM_ACCEPT;
43bd0f32 6279 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 6280 lm1 |= HCI_LM_MASTER;
1da177e4 6281 exact++;
2af6b9d5
MH		 6282 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
6283 lm2 |= HCI_LM_ACCEPT;
43bd0f32 6284 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 6285 lm2 |= HCI_LM_MASTER;
6286 }
1da177e4 6287 }
23691d75 6288 read_unlock(&chan_list_lock);
1da177e4
LT		 6289
6290 return exact ? lm1 : lm2;
6291}
6292
9e664631 6293void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 6294{
0139418c
MH		 6295 struct l2cap_conn *conn;
6296
6ed93dc6 6297 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 6298
1da177e4 6299 if (!status) {
1da177e4
LT		 6300 conn = l2cap_conn_add(hcon, status);
6301 if (conn)
6302 l2cap_conn_ready(conn);
ba6fc317 6303 } else {
e175072f 6304 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 6305 }
1da177e4
LT		 6306}
6307
686ebf28 6308int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 6309{
6310 struct l2cap_conn *conn = hcon->l2cap_data;
6311
6312 BT_DBG("hcon %p", hcon);
6313
686ebf28 6314 if (!conn)
9f5a0d7b 6315 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 6316 return conn->disc_reason;
6317}
6318
9e664631 6319void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 6320{
6321 BT_DBG("hcon %p reason %d", hcon, reason);
6322
e175072f 6323 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 6324}
6325
4343478f 6326static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 6327{
715ec005 6328 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 6329 return;
6330
f62e4323 6331 if (encrypt == 0x00) {
4343478f 6332 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 6333 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 6334 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 6335 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 6336 } else {
4343478f 6337 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 6338 __clear_chan_timer(chan);
f62e4323
MH		 6339 }
6340}
6341
686ebf28 6342int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 6343{
0139418c 6344 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 6345 struct l2cap_chan *chan;
1da177e4 6346
0139418c 6347 if (!conn)
1da177e4 6348 return 0;
0139418c 6349
89d8b407 6350 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 6351
160dc6ac 6352 if (hcon->type == LE_LINK) {
35d4adcc
HG		 6353 if (!status && encrypt)
6354 smp_distribute_keys(conn, 0);
17cd3f37 6355 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 6356 }
6357
3df91ea2 6358 mutex_lock(&conn->chan_lock);
1da177e4 6359
3df91ea2 6360 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 6361 l2cap_chan_lock(chan);
1da177e4 6362
89d8b407
AE		 6363 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6364 state_to_string(chan->state));
f1cb9af5 6365
78eb2f98
AE		 6366 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6367 l2cap_chan_unlock(chan);
6368 continue;
6369 }
6370
f1cb9af5
VCG		 6371 if (chan->scid == L2CAP_CID_LE_DATA) {
6372 if (!status && encrypt) {
6373 chan->sec_level = hcon->sec_level;
cf4cd009 6374 l2cap_chan_ready(chan);
f1cb9af5
VCG		 6375 }
6376
6be36555 6377 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 6378 continue;
6379 }
6380
96eff46e 6381 if (!__l2cap_no_conn_pending(chan)) {
6be36555 6382 l2cap_chan_unlock(chan);
6a8d3010
MH		 6383 continue;
6384 }
6385
89bc500e 6386 if (!status && (chan->state == BT_CONNECTED ||
2d792818 6387 chan->state == BT_CONFIG)) {
a7d7723a
GP		 6388 struct sock *sk = chan->sk;
6389
c5daa683 6390 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
a7d7723a
GP		 6391 sk->sk_state_change(sk);
6392
4343478f 6393 l2cap_check_encryption(chan, encrypt);
6be36555 6394 l2cap_chan_unlock(chan);
9719f8af
MH		 6395 continue;
6396 }
6397
89bc500e 6398 if (chan->state == BT_CONNECT) {
b1235d79 6399 if (!status) {
93c3e8f5 6400 l2cap_start_connection(chan);
b1235d79 6401 } else {
ba13ccd9 6402 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 6403 }
89bc500e 6404 } else if (chan->state == BT_CONNECT2) {
6be36555 6405 struct sock *sk = chan->sk;
b1235d79 6406 struct l2cap_conn_rsp rsp;
df3c3931 6407 __u16 res, stat;
1da177e4 6408
6be36555
AE		 6409 lock_sock(sk);
6410
b1235d79 6411 if (!status) {
c5daa683
GP		 6412 if (test_bit(BT_SK_DEFER_SETUP,
6413 &bt_sk(sk)->flags)) {
df3c3931
JH		 6414 res = L2CAP_CR_PEND;
6415 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 6416 chan->ops->defer(chan);
df3c3931 6417 } else {
0e587be7 6418 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 6419 res = L2CAP_CR_SUCCESS;
6420 stat = L2CAP_CS_NO_INFO;
6421 }
b1235d79 6422 } else {
0e587be7 6423 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 6424 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 6425 res = L2CAP_CR_SEC_BLOCK;
6426 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 6427 }
6428
6be36555
AE		 6429 release_sock(sk);
6430
fe4128e0
GP		 6431 rsp.scid = cpu_to_le16(chan->dcid);
6432 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 6433 rsp.result = cpu_to_le16(res);
6434 rsp.status = cpu_to_le16(stat);
fc7f8a7e 6435 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 6436 sizeof(rsp), &rsp);
2d369359
MM		 6437
6438 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6439 res == L2CAP_CR_SUCCESS) {
6440 char buf[128];
6441 set_bit(CONF_REQ_SENT, &chan->conf_state);
6442 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6443 L2CAP_CONF_REQ,
6444 l2cap_build_conf_req(chan, buf),
6445 buf);
6446 chan->num_conf_req++;
6447 }
b1235d79 6448 }
1da177e4 6449
6be36555 6450 l2cap_chan_unlock(chan);
1da177e4
LT		 6451 }
6452
3df91ea2 6453 mutex_unlock(&conn->chan_lock);
b1235d79 6454
1da177e4
LT		 6455 return 0;
6456}
6457
686ebf28 6458int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 6459{
6460 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 6461 struct l2cap_hdr *hdr;
6462 int len;
1da177e4 6463
1d13a254
AE		 6464 /* For AMP controller do not create l2cap conn */
6465 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6466 goto drop;
1da177e4 6467
5a08ecce
AE		 6468 if (!conn)
6469 conn = l2cap_conn_add(hcon, 0);
6470
6471 if (!conn)
1da177e4
LT		 6472 goto drop;
6473
6474 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6475
d73a0988
AE		 6476 switch (flags) {
6477 case ACL_START:
6478 case ACL_START_NO_FLUSH:
6479 case ACL_COMPLETE:
1da177e4
LT		 6480 if (conn->rx_len) {
6481 BT_ERR("Unexpected start frame (len %d)", skb->len);
6482 kfree_skb(conn->rx_skb);
6483 conn->rx_skb = NULL;
6484 conn->rx_len = 0;
6485 l2cap_conn_unreliable(conn, ECOMM);
6486 }
6487
aae7fe22
AE		 6488 /* Start fragment always begin with Basic L2CAP header */
6489 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 6490 BT_ERR("Frame is too short (len %d)", skb->len);
6491 l2cap_conn_unreliable(conn, ECOMM);
6492 goto drop;
6493 }
6494
6495 hdr = (struct l2cap_hdr *) skb->data;
6496 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6497
6498 if (len == skb->len) {
6499 /* Complete frame received */
6500 l2cap_recv_frame(conn, skb);
6501 return 0;
6502 }
6503
6504 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6505
6506 if (skb->len > len) {
6507 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 6508 skb->len, len);
1da177e4
LT		 6509 l2cap_conn_unreliable(conn, ECOMM);
6510 goto drop;
6511 }
6512
6513 /* Allocate skb for the complete frame (with header) */
8bcde1f2 6514 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 6515 if (!conn->rx_skb)
1da177e4
LT		 6516 goto drop;
6517
d626f62b 6518 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6519 skb->len);
1da177e4 6520 conn->rx_len = len - skb->len;
d73a0988
AE		 6521 break;
6522
6523 case ACL_CONT:
1da177e4
LT		 6524 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6525
6526 if (!conn->rx_len) {
6527 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6528 l2cap_conn_unreliable(conn, ECOMM);
6529 goto drop;
6530 }
6531
6532 if (skb->len > conn->rx_len) {
6533 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 6534 skb->len, conn->rx_len);
1da177e4
LT		 6535 kfree_skb(conn->rx_skb);
6536 conn->rx_skb = NULL;
6537 conn->rx_len = 0;
6538 l2cap_conn_unreliable(conn, ECOMM);
6539 goto drop;
6540 }
6541
d626f62b 6542 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6543 skb->len);
1da177e4
LT		 6544 conn->rx_len -= skb->len;
6545
6546 if (!conn->rx_len) {
6547 /* Complete frame received */
6548 l2cap_recv_frame(conn, conn->rx_skb);
6549 conn->rx_skb = NULL;
6550 }
d73a0988 6551 break;
1da177e4
LT		 6552 }
6553
6554drop:
6555 kfree_skb(skb);
6556 return 0;
6557}
6558
aef7d97c 6559static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 6560{
23691d75 6561 struct l2cap_chan *c;
1da177e4 6562
333055f2 6563 read_lock(&chan_list_lock);
1da177e4 6564
23691d75
GP		 6565 list_for_each_entry(c, &chan_list, global_l) {
6566 struct sock *sk = c->sk;
101545f6 6567
fcb73338
AE		 6568 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
6569 &bt_sk(sk)->src, &bt_sk(sk)->dst,
6570 c->state, __le16_to_cpu(c->psm),
6571 c->scid, c->dcid, c->imtu, c->omtu,
6572 c->sec_level, c->mode);
61e1b4b7 6573 }
1da177e4 6574
333055f2 6575 read_unlock(&chan_list_lock);
1da177e4 6576
aef7d97c 6577 return 0;
1da177e4
LT		 6578}
6579
aef7d97c
MH		 6580static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6581{
6582 return single_open(file, l2cap_debugfs_show, inode->i_private);
6583}
6584
6585static const struct file_operations l2cap_debugfs_fops = {
6586 .open = l2cap_debugfs_open,
6587 .read = seq_read,
6588 .llseek = seq_lseek,
6589 .release = single_release,
6590};
6591
6592static struct dentry *l2cap_debugfs;
1da177e4 6593
64274518 6594int __init l2cap_init(void)
1da177e4
LT		 6595{
6596 int err;
be9d1227 6597
bb58f747 6598 err = l2cap_init_sockets();
1da177e4
LT		 6599 if (err < 0)
6600 return err;
6601
aef7d97c 6602 if (bt_debugfs) {
2d792818
GP		 6603 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6604 NULL, &l2cap_debugfs_fops);
aef7d97c
MH		 6605 if (!l2cap_debugfs)
6606 BT_ERR("Failed to create L2CAP debug file");
6607 }
1da177e4 6608
1da177e4 6609 return 0;
1da177e4
LT		 6610}
6611
64274518 6612void l2cap_exit(void)
1da177e4 6613{
aef7d97c 6614 debugfs_remove(l2cap_debugfs);
bb58f747 6615 l2cap_cleanup_sockets();
1da177e4
LT		 6616}
6617
d1c4a17d
GP		 6618module_param(disable_ertm, bool, 0644);
6619MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)