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Bluetooth: Move l2cap_wait_ack() to l2cap_sock.c
[linux-2.6-block.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
422e925b 7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
1da177e4
LT		 8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
8e87d142
YH		 24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 26 SOFTWARE IS DISCLAIMED.
27*/
28
bb58f747 29/* Bluetooth L2CAP core. */
1da177e4 30
1da177e4
LT		 31#include <linux/module.h>
32
aef7d97c 33#include <linux/debugfs.h>
fcc203c3 34#include <linux/crc16.h>
1da177e4
LT		 35
36#include <net/bluetooth/bluetooth.h>
37#include <net/bluetooth/hci_core.h>
38#include <net/bluetooth/l2cap.h>
7ef9fbf0 39
ac4b7236 40#include "smp.h"
7024728e 41#include "a2mp.h"
7ef9fbf0 42#include "amp.h"
1da177e4 43
d1de6d46 44bool disable_ertm;
f0709e03 45
547d1032 46static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
d40bffbc 47static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, };
1da177e4 48
b5ad8b7f
JB		 49static LIST_HEAD(chan_list);
50static DEFINE_RWLOCK(chan_list_lock);
1da177e4 51
1da177e4 52static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 53 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 54static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 55 void *data);
710f9b0a 56static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 57static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 58
d660366d 59static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 60 struct sk_buff_head *skbs, u8 event);
608bcc6d 61
4f1654e0
MH		 62static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
63{
64 if (hcon->type == LE_LINK) {
65 if (type == ADDR_LE_DEV_PUBLIC)
66 return BDADDR_LE_PUBLIC;
67 else
68 return BDADDR_LE_RANDOM;
69 }
70
71 return BDADDR_BREDR;
72}
73
0139418c 74/* ---- L2CAP channels ---- */
71ba0e56 75
2d792818
GP		 76static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
77 u16 cid)
0139418c 78{
3df91ea2 79 struct l2cap_chan *c;
3d57dc68 80
3df91ea2
AE		 81 list_for_each_entry(c, &conn->chan_l, list) {
82 if (c->dcid == cid)
83 return c;
0139418c 84 }
3df91ea2 85 return NULL;
0139418c
MH		 86}
87
2d792818
GP		 88static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
89 u16 cid)
0139418c 90{
3df91ea2 91 struct l2cap_chan *c;
3d57dc68 92
3df91ea2
AE		 93 list_for_each_entry(c, &conn->chan_l, list) {
94 if (c->scid == cid)
95 return c;
0139418c 96 }
3df91ea2 97 return NULL;
0139418c
MH		 98}
99
100/* Find channel with given SCID.
ef191ade 101 * Returns locked channel. */
2d792818
GP		 102static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
103 u16 cid)
0139418c 104{
48454079 105 struct l2cap_chan *c;
baa7e1fa 106
3df91ea2 107 mutex_lock(&conn->chan_lock);
baa7e1fa 108 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 109 if (c)
110 l2cap_chan_lock(c);
3df91ea2
AE		 111 mutex_unlock(&conn->chan_lock);
112
48454079 113 return c;
0139418c
MH		 114}
115
b1a130b7
MM		 116/* Find channel with given DCID.
117 * Returns locked channel.
118 */
119static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
120 u16 cid)
121{
122 struct l2cap_chan *c;
123
124 mutex_lock(&conn->chan_lock);
125 c = __l2cap_get_chan_by_dcid(conn, cid);
126 if (c)
127 l2cap_chan_lock(c);
128 mutex_unlock(&conn->chan_lock);
129
130 return c;
131}
132
2d792818
GP		 133static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
134 u8 ident)
0139418c 135{
3df91ea2 136 struct l2cap_chan *c;
3d57dc68 137
3df91ea2
AE		 138 list_for_each_entry(c, &conn->chan_l, list) {
139 if (c->ident == ident)
140 return c;
0139418c 141 }
3df91ea2 142 return NULL;
0139418c
MH		 143}
144
5b155ef9
MM		 145static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
146 u8 ident)
147{
148 struct l2cap_chan *c;
149
150 mutex_lock(&conn->chan_lock);
151 c = __l2cap_get_chan_by_ident(conn, ident);
152 if (c)
153 l2cap_chan_lock(c);
154 mutex_unlock(&conn->chan_lock);
155
156 return c;
157}
158
23691d75 159static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 160{
23691d75 161 struct l2cap_chan *c;
9e4425ff 162
23691d75 163 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 164 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 165 return c;
9e4425ff 166 }
250938cb 167 return NULL;
9e4425ff
GP		 168}
169
170int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
171{
73b2ec18
GP		 172 int err;
173
333055f2 174 write_lock(&chan_list_lock);
9e4425ff 175
23691d75 176 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 177 err = -EADDRINUSE;
178 goto done;
9e4425ff
GP		 179 }
180
73b2ec18
GP		 181 if (psm) {
182 chan->psm = psm;
183 chan->sport = psm;
184 err = 0;
185 } else {
186 u16 p;
187
188 err = -EINVAL;
189 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 190 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 191 chan->psm = cpu_to_le16(p);
192 chan->sport = cpu_to_le16(p);
193 err = 0;
194 break;
195 }
196 }
9e4425ff 197
73b2ec18 198done:
333055f2 199 write_unlock(&chan_list_lock);
73b2ec18 200 return err;
9e4425ff
GP		 201}
202
203int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
204{
333055f2 205 write_lock(&chan_list_lock);
9e4425ff
GP		 206
207 chan->scid = scid;
208
333055f2 209 write_unlock(&chan_list_lock);
9e4425ff
GP		 210
211 return 0;
212}
213
baa7e1fa 214static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 215{
8db4dc46 216 u16 cid = L2CAP_CID_DYN_START;
0139418c 217
8db4dc46 218 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 219 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 220 return cid;
221 }
222
223 return 0;
224}
225
0e587be7 226static void __l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 227{
42d2d87c 228 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 229 state_to_string(state));
badaaa00 230
89bc500e 231 chan->state = state;
53f52121 232 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 233}
234
0e587be7
AE		 235static void l2cap_state_change(struct l2cap_chan *chan, int state)
236{
237 struct sock *sk = chan->sk;
238
239 lock_sock(sk);
240 __l2cap_state_change(chan, state);
241 release_sock(sk);
242}
243
f8e73017
GP		 244static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
245 int state, int err)
2e0052e4 246{
f8e73017
GP		 247 struct sock *sk = chan->sk;
248
249 lock_sock(sk);
250 chan->state = state;
53f52121 251 chan->ops->state_change(chan, chan->state, err);
f8e73017 252 release_sock(sk);
2e0052e4
AE		 253}
254
255static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
256{
257 struct sock *sk = chan->sk;
258
259 lock_sock(sk);
f8e73017 260 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 261 release_sock(sk);
262}
263
4239d16f
MM		 264static void __set_retrans_timer(struct l2cap_chan *chan)
265{
266 if (!delayed_work_pending(&chan->monitor_timer) &&
267 chan->retrans_timeout) {
268 l2cap_set_timer(chan, &chan->retrans_timer,
269 msecs_to_jiffies(chan->retrans_timeout));
270 }
271}
272
273static void __set_monitor_timer(struct l2cap_chan *chan)
274{
275 __clear_retrans_timer(chan);
276 if (chan->monitor_timeout) {
277 l2cap_set_timer(chan, &chan->monitor_timer,
278 msecs_to_jiffies(chan->monitor_timeout));
279 }
280}
281
608bcc6d
MM		 282static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
283 u16 seq)
284{
285 struct sk_buff *skb;
286
287 skb_queue_walk(head, skb) {
288 if (bt_cb(skb)->control.txseq == seq)
289 return skb;
290 }
291
292 return NULL;
293}
294
3c588192
MM		 295/* ---- L2CAP sequence number lists ---- */
296
297/* For ERTM, ordered lists of sequence numbers must be tracked for
298 * SREJ requests that are received and for frames that are to be
299 * retransmitted. These seq_list functions implement a singly-linked
300 * list in an array, where membership in the list can also be checked
301 * in constant time. Items can also be added to the tail of the list
302 * and removed from the head in constant time, without further memory
303 * allocs or frees.
304 */
305
306static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
307{
308 size_t alloc_size, i;
309
310 /* Allocated size is a power of 2 to map sequence numbers
311 * (which may be up to 14 bits) in to a smaller array that is
312 * sized for the negotiated ERTM transmit windows.
313 */
314 alloc_size = roundup_pow_of_two(size);
315
316 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
317 if (!seq_list->list)
318 return -ENOMEM;
319
320 seq_list->mask = alloc_size - 1;
321 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
322 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
323 for (i = 0; i < alloc_size; i++)
324 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
325
326 return 0;
327}
328
329static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
330{
331 kfree(seq_list->list);
332}
333
334static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
335 u16 seq)
336{
337 /* Constant-time check for list membership */
338 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
339}
340
341static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
342{
343 u16 mask = seq_list->mask;
344
345 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
346 /* In case someone tries to pop the head of an empty list */
347 return L2CAP_SEQ_LIST_CLEAR;
348 } else if (seq_list->head == seq) {
349 /* Head can be removed in constant time */
350 seq_list->head = seq_list->list[seq & mask];
351 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
352
353 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
354 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
355 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
356 }
357 } else {
358 /* Walk the list to find the sequence number */
359 u16 prev = seq_list->head;
360 while (seq_list->list[prev & mask] != seq) {
361 prev = seq_list->list[prev & mask];
362 if (prev == L2CAP_SEQ_LIST_TAIL)
363 return L2CAP_SEQ_LIST_CLEAR;
364 }
365
366 /* Unlink the number from the list and clear it */
367 seq_list->list[prev & mask] = seq_list->list[seq & mask];
368 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
369 if (seq_list->tail == seq)
370 seq_list->tail = prev;
371 }
372 return seq;
373}
374
375static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
376{
377 /* Remove the head in constant time */
378 return l2cap_seq_list_remove(seq_list, seq_list->head);
379}
380
381static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
382{
f522ae36 383 u16 i;
3c588192 384
f522ae36
GP		 385 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
386 return;
387
388 for (i = 0; i <= seq_list->mask; i++)
389 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
390
391 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
392 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 393}
394
395static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
396{
397 u16 mask = seq_list->mask;
398
399 /* All appends happen in constant time */
400
f522ae36
GP		 401 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
402 return;
3c588192 403
f522ae36
GP		 404 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
405 seq_list->head = seq;
406 else
407 seq_list->list[seq_list->tail & mask] = seq;
408
409 seq_list->tail = seq;
410 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 411}
412
721c4181 413static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 414{
721c4181 415 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 416 chan_timer.work);
3df91ea2 417 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 418 int reason;
419
e05dcc32 420 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 421
3df91ea2 422 mutex_lock(&conn->chan_lock);
6be36555 423 l2cap_chan_lock(chan);
ab07801d 424
89bc500e 425 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 426 reason = ECONNREFUSED;
89bc500e 427 else if (chan->state == BT_CONNECT &&
2d792818 428 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 429 reason = ECONNREFUSED;
430 else
431 reason = ETIMEDOUT;
432
0f852724 433 l2cap_chan_close(chan, reason);
ab07801d 434
6be36555 435 l2cap_chan_unlock(chan);
ab07801d 436
80b98027 437 chan->ops->close(chan);
3df91ea2
AE		 438 mutex_unlock(&conn->chan_lock);
439
371fd835 440 l2cap_chan_put(chan);
ab07801d
GP		 441}
442
eef1d9b6 443struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 444{
445 struct l2cap_chan *chan;
446
447 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
448 if (!chan)
449 return NULL;
450
c03b355e
AE		 451 mutex_init(&chan->lock);
452
333055f2 453 write_lock(&chan_list_lock);
23691d75 454 list_add(&chan->global_l, &chan_list);
333055f2 455 write_unlock(&chan_list_lock);
23691d75 456
721c4181 457 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 458
89bc500e
GP		 459 chan->state = BT_OPEN;
460
144ad330 461 kref_init(&chan->kref);
71ba0e56 462
2827011f
MM		 463 /* This flag is cleared in l2cap_chan_ready() */
464 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
465
eef1d9b6 466 BT_DBG("chan %p", chan);
abc545b8 467
48454079
GP		 468 return chan;
469}
470
144ad330 471static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 472{
144ad330
SS		 473 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
474
4af66c69
JK		 475 BT_DBG("chan %p", chan);
476
333055f2 477 write_lock(&chan_list_lock);
23691d75 478 list_del(&chan->global_l);
333055f2 479 write_unlock(&chan_list_lock);
23691d75 480
4af66c69 481 kfree(chan);
6ff5abbf
GP		 482}
483
30648372
JK		 484void l2cap_chan_hold(struct l2cap_chan *c)
485{
144ad330 486 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 487
144ad330 488 kref_get(&c->kref);
30648372
JK		 489}
490
491void l2cap_chan_put(struct l2cap_chan *c)
492{
144ad330 493 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 494
144ad330 495 kref_put(&c->kref, l2cap_chan_destroy);
30648372
JK		 496}
497
bd4b1653
AE		 498void l2cap_chan_set_defaults(struct l2cap_chan *chan)
499{
500 chan->fcs = L2CAP_FCS_CRC16;
501 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
502 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
503 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
c20f8e35 504 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653
AE		 505 chan->sec_level = BT_SECURITY_LOW;
506
507 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
508}
509
93c3e8f5 510void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 511{
af05b30b 512 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 513 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 514
9f5a0d7b 515 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 516
8c1d787b 517 chan->conn = conn;
0139418c 518
5491120e
AE		 519 switch (chan->chan_type) {
520 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b
VT		 521 if (conn->hcon->type == LE_LINK) {
522 /* LE connection */
6fcb06a2 523 chan->omtu = L2CAP_DEFAULT_MTU;
9f22398c
JH		 524 if (chan->dcid == L2CAP_CID_ATT)
525 chan->scid = L2CAP_CID_ATT;
526 else
527 chan->scid = l2cap_alloc_cid(conn);
b62f328b
VT		 528 } else {
529 /* Alloc CID for connection-oriented socket */
fe4128e0 530 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 531 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 532 }
5491120e
AE		 533 break;
534
535 case L2CAP_CHAN_CONN_LESS:
0139418c 536 /* Connectionless socket */
fe4128e0
GP		 537 chan->scid = L2CAP_CID_CONN_LESS;
538 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 539 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 540 break;
541
416fa752
AE		 542 case L2CAP_CHAN_CONN_FIX_A2MP:
543 chan->scid = L2CAP_CID_A2MP;
544 chan->dcid = L2CAP_CID_A2MP;
545 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
546 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
547 break;
548
5491120e 549 default:
0139418c 550 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 551 chan->scid = L2CAP_CID_SIGNALING;
552 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 553 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 554 }
555
8f7975b1
AE		 556 chan->local_id = L2CAP_BESTEFFORT_ID;
557 chan->local_stype = L2CAP_SERV_BESTEFFORT;
558 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
559 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
560 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 561 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 562
371fd835 563 l2cap_chan_hold(chan);
baa7e1fa 564
5ee9891d
JH		 565 hci_conn_hold(conn->hcon);
566
3df91ea2 567 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 568}
569
466f8004 570void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 571{
572 mutex_lock(&conn->chan_lock);
573 __l2cap_chan_add(conn, chan);
3df91ea2 574 mutex_unlock(&conn->chan_lock);
0139418c
MH		 575}
576
466f8004 577void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 578{
8c1d787b 579 struct l2cap_conn *conn = chan->conn;
0139418c 580
c9b66675 581 __clear_chan_timer(chan);
0139418c 582
49208c9c 583 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 584
8e87d142 585 if (conn) {
56f60984 586 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 587 /* Delete from channel list */
3df91ea2 588 list_del(&chan->list);
3d57dc68 589
371fd835 590 l2cap_chan_put(chan);
baa7e1fa 591
8c1d787b 592 chan->conn = NULL;
3cabbfda
AE		 593
594 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
76a68ba0 595 hci_conn_drop(conn->hcon);
56f60984
AE		 596
597 if (mgr && mgr->bredr_chan == chan)
598 mgr->bredr_chan = NULL;
0139418c
MH		 599 }
600
419e08c1
AE		 601 if (chan->hs_hchan) {
602 struct hci_chan *hs_hchan = chan->hs_hchan;
603
604 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
605 amp_disconnect_logical_link(hs_hchan);
606 }
607
b699ec0d 608 chan->ops->teardown(chan, err);
6be36555 609
2827011f 610 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 611 return;
2ead70b8 612
ee556f66
GP		 613 switch(chan->mode) {
614 case L2CAP_MODE_BASIC:
615 break;
c13ffa62 616
ee556f66 617 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 618 __clear_retrans_timer(chan);
619 __clear_monitor_timer(chan);
620 __clear_ack_timer(chan);
c13ffa62 621
f1c6775b 622 skb_queue_purge(&chan->srej_q);
c13ffa62 623
3c588192
MM		 624 l2cap_seq_list_free(&chan->srej_list);
625 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 626
627 /* fall through */
628
629 case L2CAP_MODE_STREAMING:
630 skb_queue_purge(&chan->tx_q);
631 break;
c13ffa62 632 }
ee556f66
GP		 633
634 return;
0139418c
MH		 635}
636
0f852724 637void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 638{
639 struct l2cap_conn *conn = chan->conn;
4519de9a 640
7eafc59e 641 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 642
89bc500e 643 switch (chan->state) {
4519de9a 644 case BT_LISTEN:
b699ec0d 645 chan->ops->teardown(chan, 0);
4519de9a
GP		 646 break;
647
648 case BT_CONNECTED:
649 case BT_CONFIG:
715ec005 650 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 651 conn->hcon->type == ACL_LINK) {
8d836d71 652 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 653 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 654 } else
655 l2cap_chan_del(chan, reason);
656 break;
657
658 case BT_CONNECT2:
715ec005 659 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
2d792818 660 conn->hcon->type == ACL_LINK) {
4519de9a
GP		 661 struct l2cap_conn_rsp rsp;
662 __u16 result;
663
bdc25783 664 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
4519de9a
GP		 665 result = L2CAP_CR_SEC_BLOCK;
666 else
667 result = L2CAP_CR_BAD_PSM;
bdc25783 668
89bc500e 669 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 670
671 rsp.scid = cpu_to_le16(chan->dcid);
672 rsp.dcid = cpu_to_le16(chan->scid);
673 rsp.result = cpu_to_le16(result);
ac73498c 674 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4519de9a 675 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 676 sizeof(rsp), &rsp);
4519de9a
GP		 677 }
678
679 l2cap_chan_del(chan, reason);
680 break;
681
682 case BT_CONNECT:
683 case BT_DISCONN:
684 l2cap_chan_del(chan, reason);
685 break;
686
687 default:
b699ec0d 688 chan->ops->teardown(chan, 0);
4519de9a
GP		 689 break;
690 }
691}
692
4343478f 693static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 694{
6a974b50
MH		 695 switch (chan->chan_type) {
696 case L2CAP_CHAN_RAW:
4343478f 697 switch (chan->sec_level) {
8556edd3
JH		 698 case BT_SECURITY_HIGH:
699 return HCI_AT_DEDICATED_BONDING_MITM;
700 case BT_SECURITY_MEDIUM:
701 return HCI_AT_DEDICATED_BONDING;
702 default:
703 return HCI_AT_NO_BONDING;
704 }
6a974b50 705 break;
3124b843
MH		 706 case L2CAP_CHAN_CONN_LESS:
707 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) {
708 if (chan->sec_level == BT_SECURITY_LOW)
709 chan->sec_level = BT_SECURITY_SDP;
710 }
711 if (chan->sec_level == BT_SECURITY_HIGH)
712 return HCI_AT_NO_BONDING_MITM;
713 else
714 return HCI_AT_NO_BONDING;
715 break;
6a974b50
MH		 716 case L2CAP_CHAN_CONN_ORIENTED:
717 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
718 if (chan->sec_level == BT_SECURITY_LOW)
719 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 720
6a974b50
MH		 721 if (chan->sec_level == BT_SECURITY_HIGH)
722 return HCI_AT_NO_BONDING_MITM;
723 else
724 return HCI_AT_NO_BONDING;
725 }
726 /* fall through */
727 default:
4343478f 728 switch (chan->sec_level) {
00ae4af9 729 case BT_SECURITY_HIGH:
8556edd3 730 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 731 case BT_SECURITY_MEDIUM:
8556edd3 732 return HCI_AT_GENERAL_BONDING;
00ae4af9 733 default:
8556edd3 734 return HCI_AT_NO_BONDING;
00ae4af9 735 }
6a974b50 736 break;
0684e5f9 737 }
8556edd3
JH		 738}
739
740/* Service level security */
d45fc423 741int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 742{
8c1d787b 743 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 744 __u8 auth_type;
745
4343478f 746 auth_type = l2cap_get_auth_type(chan);
79d554a6 747
4343478f 748 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 749}
750
b5ad8b7f 751static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 752{
753 u8 id;
754
755 /* Get next available identificator.
756 * 1 - 128 are used by kernel.
757 * 129 - 199 are reserved.
758 * 200 - 254 are used by utilities like l2ping, etc.
759 */
760
333055f2 761 spin_lock(&conn->lock);
4e8402a3
MH		 762
763 if (++conn->tx_ident > 128)
764 conn->tx_ident = 1;
765
766 id = conn->tx_ident;
767
333055f2 768 spin_unlock(&conn->lock);
4e8402a3
MH		 769
770 return id;
771}
772
2d792818
GP		 773static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
774 void *data)
4e8402a3
MH		 775{
776 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 777 u8 flags;
4e8402a3
MH		 778
779 BT_DBG("code 0x%2.2x", code);
780
781 if (!skb)
9a9c6a34 782 return;
4e8402a3 783
e702112f
AE		 784 if (lmp_no_flush_capable(conn->hcon->hdev))
785 flags = ACL_START_NO_FLUSH;
786 else
787 flags = ACL_START;
788
14b12d0b 789 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 790 skb->priority = HCI_PRIO_MAX;
14b12d0b 791
73d80deb
LAD		 792 hci_send_acl(conn->hchan, skb, flags);
793}
794
02b0fbb9
MM		 795static bool __chan_is_moving(struct l2cap_chan *chan)
796{
797 return chan->move_state != L2CAP_MOVE_STABLE &&
798 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
799}
800
73d80deb
LAD		 801static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
802{
803 struct hci_conn *hcon = chan->conn->hcon;
804 u16 flags;
805
806 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 807 skb->priority);
73d80deb 808
d5f8a75d
MM		 809 if (chan->hs_hcon && !__chan_is_moving(chan)) {
810 if (chan->hs_hchan)
811 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
812 else
813 kfree_skb(skb);
814
815 return;
816 }
817
73d80deb 818 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 819 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 820 flags = ACL_START_NO_FLUSH;
821 else
822 flags = ACL_START;
14b12d0b 823
73d80deb
LAD		 824 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
825 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 826}
827
b76bbd66
MM		 828static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
829{
830 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
831 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
832
833 if (enh & L2CAP_CTRL_FRAME_TYPE) {
834 /* S-Frame */
835 control->sframe = 1;
836 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
837 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
838
839 control->sar = 0;
840 control->txseq = 0;
841 } else {
842 /* I-Frame */
843 control->sframe = 0;
844 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
845 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
846
847 control->poll = 0;
848 control->super = 0;
849 }
850}
851
b76bbd66
MM		 852static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
853{
854 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
855 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
856
857 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
858 /* S-Frame */
859 control->sframe = 1;
860 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
861 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
862
863 control->sar = 0;
864 control->txseq = 0;
865 } else {
866 /* I-Frame */
867 control->sframe = 0;
868 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
869 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
870
871 control->poll = 0;
872 control->super = 0;
873 }
874}
875
876static inline void __unpack_control(struct l2cap_chan *chan,
877 struct sk_buff *skb)
878{
879 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
880 __unpack_extended_control(get_unaligned_le32(skb->data),
881 &bt_cb(skb)->control);
cec8ab6e 882 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 883 } else {
884 __unpack_enhanced_control(get_unaligned_le16(skb->data),
885 &bt_cb(skb)->control);
cec8ab6e 886 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 887 }
888}
889
b5c6aaed
MM		 890static u32 __pack_extended_control(struct l2cap_ctrl *control)
891{
892 u32 packed;
893
894 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
895 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
896
897 if (control->sframe) {
898 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
899 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
900 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
901 } else {
902 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
903 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
904 }
905
906 return packed;
907}
908
909static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
910{
911 u16 packed;
912
913 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
914 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
915
916 if (control->sframe) {
917 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
918 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
919 packed |= L2CAP_CTRL_FRAME_TYPE;
920 } else {
921 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
922 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
923 }
924
925 return packed;
926}
927
b76bbd66
MM		 928static inline void __pack_control(struct l2cap_chan *chan,
929 struct l2cap_ctrl *control,
930 struct sk_buff *skb)
931{
932 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
933 put_unaligned_le32(__pack_extended_control(control),
934 skb->data + L2CAP_HDR_SIZE);
935 } else {
936 put_unaligned_le16(__pack_enhanced_control(control),
937 skb->data + L2CAP_HDR_SIZE);
938 }
939}
940
ba7aa64f
GP		 941static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
942{
943 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
944 return L2CAP_EXT_HDR_SIZE;
945 else
946 return L2CAP_ENH_HDR_SIZE;
947}
948
a67d7f6f
MM		 949static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
950 u32 control)
b5c6aaed
MM		 951{
952 struct sk_buff *skb;
953 struct l2cap_hdr *lh;
ba7aa64f 954 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 955
956 if (chan->fcs == L2CAP_FCS_CRC16)
957 hlen += L2CAP_FCS_SIZE;
958
a67d7f6f 959 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 960
b5c6aaed 961 if (!skb)
a67d7f6f 962 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 963
964 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
965 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
966 lh->cid = cpu_to_le16(chan->dcid);
967
a67d7f6f
MM		 968 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
969 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
970 else
971 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 972
973 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 974 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 975 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
976 }
977
978 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 979 return skb;
980}
981
982static void l2cap_send_sframe(struct l2cap_chan *chan,
983 struct l2cap_ctrl *control)
984{
985 struct sk_buff *skb;
986 u32 control_field;
987
988 BT_DBG("chan %p, control %p", chan, control);
989
990 if (!control->sframe)
991 return;
992
b99e13ad
MM		 993 if (__chan_is_moving(chan))
994 return;
995
a67d7f6f
MM		 996 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
997 !control->poll)
998 control->final = 1;
999
1000 if (control->super == L2CAP_SUPER_RR)
1001 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1002 else if (control->super == L2CAP_SUPER_RNR)
1003 set_bit(CONN_RNR_SENT, &chan->conn_state);
1004
1005 if (control->super != L2CAP_SUPER_SREJ) {
1006 chan->last_acked_seq = control->reqseq;
1007 __clear_ack_timer(chan);
1008 }
1009
1010 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1011 control->final, control->poll, control->super);
1012
1013 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1014 control_field = __pack_extended_control(control);
1015 else
1016 control_field = __pack_enhanced_control(control);
1017
1018 skb = l2cap_create_sframe_pdu(chan, control_field);
1019 if (!IS_ERR(skb))
1020 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1021}
1022
c9e3d5e0 1023static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1024{
c9e3d5e0
MM		 1025 struct l2cap_ctrl control;
1026
1027 BT_DBG("chan %p, poll %d", chan, poll);
1028
1029 memset(&control, 0, sizeof(control));
1030 control.sframe = 1;
1031 control.poll = poll;
1032
1033 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1034 control.super = L2CAP_SUPER_RNR;
1035 else
1036 control.super = L2CAP_SUPER_RR;
b5c6aaed 1037
c9e3d5e0
MM		 1038 control.reqseq = chan->buffer_seq;
1039 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1040}
1041
b4450035 1042static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1043{
c1360a1c 1044 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1045}
1046
1df7b17a 1047static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1048{
1df7b17a 1049 struct l2cap_conn *conn = chan->conn;
80d58d0b 1050 struct hci_dev *hdev;
1df7b17a
MH		 1051 bool amp_available = false;
1052
1053 if (!conn->hs_enabled)
1054 return false;
1055
1056 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1057 return false;
80d58d0b
MH		 1058
1059 read_lock(&hci_dev_list_lock);
1df7b17a 1060 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1061 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1062 test_bit(HCI_UP, &hdev->flags)) {
1063 amp_available = true;
1064 break;
1065 }
1066 }
80d58d0b
MH		 1067 read_unlock(&hci_dev_list_lock);
1068
1df7b17a
MH		 1069 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1070 return amp_available;
848566b3
MH		 1071
1072 return false;
93c3e8f5
AE		 1073}
1074
5ce66b59
AE		 1075static bool l2cap_check_efs(struct l2cap_chan *chan)
1076{
1077 /* Check EFS parameters */
1078 return true;
1079}
1080
2766be48 1081void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1082{
1083 struct l2cap_conn *conn = chan->conn;
1084 struct l2cap_conn_req req;
1085
1086 req.scid = cpu_to_le16(chan->scid);
1087 req.psm = chan->psm;
1088
1089 chan->ident = l2cap_get_ident(conn);
1090
1091 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1092
1093 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1094}
1095
8eb200bd
MM		 1096static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1097{
1098 struct l2cap_create_chan_req req;
1099 req.scid = cpu_to_le16(chan->scid);
1100 req.psm = chan->psm;
1101 req.amp_id = amp_id;
1102
1103 chan->ident = l2cap_get_ident(chan->conn);
1104
1105 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1106 sizeof(req), &req);
1107}
1108
02b0fbb9
MM		 1109static void l2cap_move_setup(struct l2cap_chan *chan)
1110{
1111 struct sk_buff *skb;
1112
1113 BT_DBG("chan %p", chan);
1114
1115 if (chan->mode != L2CAP_MODE_ERTM)
1116 return;
1117
1118 __clear_retrans_timer(chan);
1119 __clear_monitor_timer(chan);
1120 __clear_ack_timer(chan);
1121
1122 chan->retry_count = 0;
1123 skb_queue_walk(&chan->tx_q, skb) {
1124 if (bt_cb(skb)->control.retries)
1125 bt_cb(skb)->control.retries = 1;
1126 else
1127 break;
1128 }
1129
1130 chan->expected_tx_seq = chan->buffer_seq;
1131
1132 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1133 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1134 l2cap_seq_list_clear(&chan->retrans_list);
1135 l2cap_seq_list_clear(&chan->srej_list);
1136 skb_queue_purge(&chan->srej_q);
1137
1138 chan->tx_state = L2CAP_TX_STATE_XMIT;
1139 chan->rx_state = L2CAP_RX_STATE_MOVE;
1140
1141 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1142}
1143
5f3847a4
MM		 1144static void l2cap_move_done(struct l2cap_chan *chan)
1145{
1146 u8 move_role = chan->move_role;
1147 BT_DBG("chan %p", chan);
1148
1149 chan->move_state = L2CAP_MOVE_STABLE;
1150 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1151
1152 if (chan->mode != L2CAP_MODE_ERTM)
1153 return;
1154
1155 switch (move_role) {
1156 case L2CAP_MOVE_ROLE_INITIATOR:
1157 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1158 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1159 break;
1160 case L2CAP_MOVE_ROLE_RESPONDER:
1161 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1162 break;
1163 }
1164}
1165
9f0caeb1
VCG		 1166static void l2cap_chan_ready(struct l2cap_chan *chan)
1167{
2827011f 1168 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1169 chan->conf_state = 0;
1170 __clear_chan_timer(chan);
1171
54a59aa2 1172 chan->state = BT_CONNECTED;
9f0caeb1 1173
fd83e2c2 1174 chan->ops->ready(chan);
9f0caeb1
VCG		 1175}
1176
93c3e8f5
AE		 1177static void l2cap_start_connection(struct l2cap_chan *chan)
1178{
1179 if (__amp_capable(chan)) {
1180 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1181 a2mp_discover_amp(chan);
1182 } else {
1183 l2cap_send_conn_req(chan);
1184 }
1185}
1186
fc7f8a7e 1187static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1188{
8c1d787b 1189 struct l2cap_conn *conn = chan->conn;
79d554a6 1190
9f0caeb1
VCG		 1191 if (conn->hcon->type == LE_LINK) {
1192 l2cap_chan_ready(chan);
1193 return;
1194 }
1195
79d554a6 1196 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1197 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1198 return;
1199
d45fc423 1200 if (l2cap_chan_check_security(chan) &&
2d792818 1201 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1202 l2cap_start_connection(chan);
1203 }
79d554a6
MH		 1204 } else {
1205 struct l2cap_info_req req;
ac73498c 1206 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1207
1208 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1209 conn->info_ident = l2cap_get_ident(conn);
1210
ba13ccd9 1211 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1212
2d792818
GP		 1213 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1214 sizeof(req), &req);
79d554a6
MH		 1215 }
1216}
1217
cf6c2c0b
GP		 1218static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1219{
1220 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1221 if (!disable_ertm)
cf6c2c0b
GP		 1222 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1223
1224 switch (mode) {
1225 case L2CAP_MODE_ERTM:
1226 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1227 case L2CAP_MODE_STREAMING:
1228 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1229 default:
1230 return 0x00;
1231 }
1232}
1233
5e4e3972 1234static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1235{
5e4e3972 1236 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1237 struct l2cap_disconn_req req;
1238
c13ffa62
GP		 1239 if (!conn)
1240 return;
1241
aad3d0e3 1242 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1243 __clear_retrans_timer(chan);
1244 __clear_monitor_timer(chan);
1245 __clear_ack_timer(chan);
c13ffa62
GP		 1246 }
1247
416fa752 1248 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
d117773c 1249 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1250 return;
1251 }
1252
fe4128e0
GP		 1253 req.dcid = cpu_to_le16(chan->dcid);
1254 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1255 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1256 sizeof(req), &req);
c13ffa62 1257
f8e73017 1258 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1259}
1260
1da177e4 1261/* ---- L2CAP connections ---- */
4e8402a3
MH		 1262static void l2cap_conn_start(struct l2cap_conn *conn)
1263{
3df91ea2 1264 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1265
1266 BT_DBG("conn %p", conn);
1267
3df91ea2 1268 mutex_lock(&conn->chan_lock);
4e8402a3 1269
3df91ea2 1270 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1271 l2cap_chan_lock(chan);
4e8402a3 1272
715ec005 1273 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1274 l2cap_chan_unlock(chan);
79d554a6
MH		 1275 continue;
1276 }
1277
89bc500e 1278 if (chan->state == BT_CONNECT) {
d45fc423 1279 if (!l2cap_chan_check_security(chan) ||
2d792818 1280 !__l2cap_no_conn_pending(chan)) {
6be36555 1281 l2cap_chan_unlock(chan);
47731de7
GP		 1282 continue;
1283 }
79d554a6 1284
c1360a1c 1285 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1286 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1287 &chan->conf_state)) {
89bc500e 1288 l2cap_chan_close(chan, ECONNRESET);
6be36555 1289 l2cap_chan_unlock(chan);
47731de7 1290 continue;
b1235d79 1291 }
47731de7 1292
93c3e8f5 1293 l2cap_start_connection(chan);
47731de7 1294
89bc500e 1295 } else if (chan->state == BT_CONNECT2) {
79d554a6 1296 struct l2cap_conn_rsp rsp;
e9aeb2dd 1297 char buf[128];
fe4128e0
GP		 1298 rsp.scid = cpu_to_le16(chan->dcid);
1299 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1300
d45fc423 1301 if (l2cap_chan_check_security(chan)) {
bdc25783
MH		 1302 struct sock *sk = chan->sk;
1303
6be36555 1304 lock_sock(sk);
bdc25783 1305 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
ac73498c
AE		 1306 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1307 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1308 chan->ops->defer(chan);
f66dc81f
MH		 1309
1310 } else {
0e587be7 1311 __l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1312 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1313 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1314 }
6be36555 1315 release_sock(sk);
79d554a6 1316 } else {
ac73498c
AE		 1317 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1318 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1319 }
1320
fc7f8a7e 1321 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1322 sizeof(rsp), &rsp);
e9aeb2dd 1323
c1360a1c 1324 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1325 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1326 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1327 continue;
1328 }
1329
c1360a1c 1330 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1331 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1332 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1333 chan->num_conf_req++;
4e8402a3
MH		 1334 }
1335
6be36555 1336 l2cap_chan_unlock(chan);
4e8402a3
MH		 1337 }
1338
3df91ea2 1339 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1340}
1341
c2287681 1342/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1343 * Returns closest match, locked.
1344 */
d9b88702 1345static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1346 bdaddr_t *src,
1347 bdaddr_t *dst)
b62f328b 1348{
23691d75 1349 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1350
23691d75 1351 read_lock(&chan_list_lock);
b62f328b 1352
23691d75 1353 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1354 if (state && c->state != state)
b62f328b
VT		 1355 continue;
1356
23691d75 1357 if (c->scid == cid) {
c2287681
IY		 1358 int src_match, dst_match;
1359 int src_any, dst_any;
1360
b62f328b 1361 /* Exact match. */
7eafc59e
MH		 1362 src_match = !bacmp(&c->src, src);
1363 dst_match = !bacmp(&c->dst, dst);
c2287681 1364 if (src_match && dst_match) {
23691d75
GP		 1365 read_unlock(&chan_list_lock);
1366 return c;
1367 }
b62f328b
VT		 1368
1369 /* Closest match */
7eafc59e
MH		 1370 src_any = !bacmp(&c->src, BDADDR_ANY);
1371 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1372 if ((src_match && dst_any) || (src_any && dst_match) ||
1373 (src_any && dst_any))
23691d75 1374 c1 = c;
b62f328b
VT		 1375 }
1376 }
280f294f 1377
23691d75 1378 read_unlock(&chan_list_lock);
b62f328b 1379
23691d75 1380 return c1;
b62f328b
VT		 1381}
1382
1383static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1384{
60bac184 1385 struct sock *parent;
23691d75 1386 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 1387
1388 BT_DBG("");
1389
1390 /* Check if we have socket listening on cid */
073d1cf3 1391 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
6f59b904 1392 &conn->hcon->src, &conn->hcon->dst);
23691d75 1393 if (!pchan)
b62f328b
VT		 1394 return;
1395
44f3b0fb
JH		 1396 /* Client ATT sockets should override the server one */
1397 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1398 return;
1399
23691d75
GP		 1400 parent = pchan->sk;
1401
aa2ac881 1402 lock_sock(parent);
62f3a2cf 1403
80b98027 1404 chan = pchan->ops->new_connection(pchan);
80808e43 1405 if (!chan)
b62f328b
VT		 1406 goto clean;
1407
9f22398c
JH		 1408 chan->dcid = L2CAP_CID_ATT;
1409
7eafc59e
MH		 1410 bacpy(&chan->src, &conn->hcon->src);
1411 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 1412 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
1413 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
b62f328b 1414
44f3b0fb 1415 __l2cap_chan_add(conn, chan);
48454079 1416
b62f328b 1417clean:
aa2ac881 1418 release_sock(parent);
b62f328b
VT		 1419}
1420
4e8402a3
MH		 1421static void l2cap_conn_ready(struct l2cap_conn *conn)
1422{
48454079 1423 struct l2cap_chan *chan;
cc110922 1424 struct hci_conn *hcon = conn->hcon;
4e8402a3 1425
79d554a6 1426 BT_DBG("conn %p", conn);
4e8402a3 1427
d8729922
JH		 1428 /* For outgoing pairing which doesn't necessarily have an
1429 * associated socket (e.g. mgmt_pair_device).
1430 */
cc110922
VCG		 1431 if (hcon->out && hcon->type == LE_LINK)
1432 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1433
3df91ea2 1434 mutex_lock(&conn->chan_lock);
4e8402a3 1435
44f3b0fb
JH		 1436 if (hcon->type == LE_LINK)
1437 l2cap_le_conn_ready(conn);
1438
3df91ea2 1439 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1440
6be36555 1441 l2cap_chan_lock(chan);
4e8402a3 1442
416fa752
AE		 1443 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1444 l2cap_chan_unlock(chan);
1445 continue;
1446 }
1447
cc110922
VCG		 1448 if (hcon->type == LE_LINK) {
1449 if (smp_conn_security(hcon, chan->sec_level))
cf4cd009 1450 l2cap_chan_ready(chan);
acd7d370 1451
63128451 1452 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1453 struct sock *sk = chan->sk;
c9b66675 1454 __clear_chan_timer(chan);
6be36555 1455 lock_sock(sk);
0e587be7 1456 __l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1457 sk->sk_state_change(sk);
6be36555 1458 release_sock(sk);
b501d6a1 1459
1c244f79 1460 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1461 l2cap_do_start(chan);
1c244f79 1462 }
4e8402a3 1463
6be36555 1464 l2cap_chan_unlock(chan);
4e8402a3 1465 }
79d554a6 1466
3df91ea2 1467 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1468}
1469
1470/* Notify sockets that we cannot guaranty reliability anymore */
1471static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1472{
48454079 1473 struct l2cap_chan *chan;
4e8402a3
MH		 1474
1475 BT_DBG("conn %p", conn);
1476
3df91ea2 1477 mutex_lock(&conn->chan_lock);
4e8402a3 1478
3df91ea2 1479 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1480 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1481 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1482 }
1483
3df91ea2 1484 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1485}
1486
f878fcad 1487static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1488{
f878fcad 1489 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1490 info_timer.work);
4e8402a3 1491
984947dc 1492 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1493 conn->info_ident = 0;
984947dc 1494
4e8402a3
MH		 1495 l2cap_conn_start(conn);
1496}
1497
2c8e1411
DH		 1498/*
1499 * l2cap_user
1500 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1501 * callback is called during registration. The ->remove callback is called
1502 * during unregistration.
1503 * An l2cap_user object can either be explicitly unregistered or when the
1504 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1505 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1506 * External modules must own a reference to the l2cap_conn object if they intend
1507 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1508 * any time if they don't.
1509 */
1510
1511int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1512{
1513 struct hci_dev *hdev = conn->hcon->hdev;
1514 int ret;
1515
1516 /* We need to check whether l2cap_conn is registered. If it is not, we
1517 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1518 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1519 * relies on the parent hci_conn object to be locked. This itself relies
1520 * on the hci_dev object to be locked. So we must lock the hci device
1521 * here, too. */
1522
1523 hci_dev_lock(hdev);
1524
1525 if (user->list.next || user->list.prev) {
1526 ret = -EINVAL;
1527 goto out_unlock;
1528 }
1529
1530 /* conn->hchan is NULL after l2cap_conn_del() was called */
1531 if (!conn->hchan) {
1532 ret = -ENODEV;
1533 goto out_unlock;
1534 }
1535
1536 ret = user->probe(conn, user);
1537 if (ret)
1538 goto out_unlock;
1539
1540 list_add(&user->list, &conn->users);
1541 ret = 0;
1542
1543out_unlock:
1544 hci_dev_unlock(hdev);
1545 return ret;
1546}
1547EXPORT_SYMBOL(l2cap_register_user);
1548
1549void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1550{
1551 struct hci_dev *hdev = conn->hcon->hdev;
1552
1553 hci_dev_lock(hdev);
1554
1555 if (!user->list.next || !user->list.prev)
1556 goto out_unlock;
1557
1558 list_del(&user->list);
1559 user->list.next = NULL;
1560 user->list.prev = NULL;
1561 user->remove(conn, user);
1562
1563out_unlock:
1564 hci_dev_unlock(hdev);
1565}
1566EXPORT_SYMBOL(l2cap_unregister_user);
1567
1568static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1569{
1570 struct l2cap_user *user;
1571
1572 while (!list_empty(&conn->users)) {
1573 user = list_first_entry(&conn->users, struct l2cap_user, list);
1574 list_del(&user->list);
1575 user->list.next = NULL;
1576 user->list.prev = NULL;
1577 user->remove(conn, user);
1578 }
1579}
1580
5d3de7df
VCG		 1581static void l2cap_conn_del(struct hci_conn *hcon, int err)
1582{
1583 struct l2cap_conn *conn = hcon->l2cap_data;
1584 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1585
1586 if (!conn)
1587 return;
1588
1589 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1590
1591 kfree_skb(conn->rx_skb);
1592
2c8e1411
DH		 1593 l2cap_unregister_all_users(conn);
1594
3df91ea2
AE		 1595 mutex_lock(&conn->chan_lock);
1596
5d3de7df
VCG		 1597 /* Kill channels */
1598 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1599 l2cap_chan_hold(chan);
6be36555
AE		 1600 l2cap_chan_lock(chan);
1601
5d3de7df 1602 l2cap_chan_del(chan, err);
6be36555
AE		 1603
1604 l2cap_chan_unlock(chan);
1605
80b98027 1606 chan->ops->close(chan);
61d6ef3e 1607 l2cap_chan_put(chan);
5d3de7df
VCG		 1608 }
1609
3df91ea2
AE		 1610 mutex_unlock(&conn->chan_lock);
1611
73d80deb
LAD		 1612 hci_chan_del(conn->hchan);
1613
5d3de7df 1614 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1615 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1616
51a8efd7 1617 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1618 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1619 smp_chan_destroy(conn);
d26a2345 1620 }
5d3de7df
VCG		 1621
1622 hcon->l2cap_data = NULL;
9c903e37
DH		 1623 conn->hchan = NULL;
1624 l2cap_conn_put(conn);
5d3de7df
VCG		 1625}
1626
6c9d42a1 1627static void security_timeout(struct work_struct *work)
5d3de7df 1628{
6c9d42a1 1629 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1630 security_timer.work);
5d3de7df 1631
d06cc416
JH		 1632 BT_DBG("conn %p", conn);
1633
1634 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1635 smp_chan_destroy(conn);
1636 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1637 }
5d3de7df
VCG		 1638}
1639
baf43251 1640static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
1da177e4 1641{
0139418c 1642 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1643 struct hci_chan *hchan;
1da177e4 1644
baf43251 1645 if (conn)
1da177e4
LT		 1646 return conn;
1647
73d80deb
LAD		 1648 hchan = hci_chan_create(hcon);
1649 if (!hchan)
1650 return NULL;
1651
8bcde1f2 1652 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
73d80deb
LAD		 1653 if (!conn) {
1654 hci_chan_del(hchan);
1da177e4 1655 return NULL;
73d80deb 1656 }
1da177e4 1657
9c903e37 1658 kref_init(&conn->ref);
1da177e4
LT		 1659 hcon->l2cap_data = conn;
1660 conn->hcon = hcon;
9c903e37 1661 hci_conn_get(conn->hcon);
73d80deb 1662 conn->hchan = hchan;
1da177e4 1663
73d80deb 1664 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1665
dcc042d5 1666 switch (hcon->type) {
dcc042d5
AE		 1667 case LE_LINK:
1668 if (hcon->hdev->le_mtu) {
1669 conn->mtu = hcon->hdev->le_mtu;
1670 break;
1671 }
1672 /* fall through */
dcc042d5 1673 default:
acd7d370 1674 conn->mtu = hcon->hdev->acl_mtu;
dcc042d5
AE		 1675 break;
1676 }
acd7d370 1677
4e8402a3
MH		 1678 conn->feat_mask = 0;
1679
848566b3
MH		 1680 if (hcon->type == ACL_LINK)
1681 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
1682 &hcon->hdev->dev_flags);
1683
1da177e4 1684 spin_lock_init(&conn->lock);
3df91ea2 1685 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1686
1687 INIT_LIST_HEAD(&conn->chan_l);
2c8e1411 1688 INIT_LIST_HEAD(&conn->users);
1da177e4 1689
5d3de7df 1690 if (hcon->type == LE_LINK)
6c9d42a1 1691 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1692 else
030013d8 1693 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1694
9f5a0d7b 1695 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1696
1da177e4
LT		 1697 return conn;
1698}
1699
9c903e37
DH		 1700static void l2cap_conn_free(struct kref *ref)
1701{
1702 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1703
1704 hci_conn_put(conn->hcon);
1705 kfree(conn);
1706}
1707
1708void l2cap_conn_get(struct l2cap_conn *conn)
1709{
1710 kref_get(&conn->ref);
1711}
1712EXPORT_SYMBOL(l2cap_conn_get);
1713
1714void l2cap_conn_put(struct l2cap_conn *conn)
1715{
1716 kref_put(&conn->ref, l2cap_conn_free);
1717}
1718EXPORT_SYMBOL(l2cap_conn_put);
1719
1da177e4 1720/* ---- Socket interface ---- */
1da177e4 1721
c2287681 1722/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1723 * Returns closest match.
1724 */
c2287681
IY		 1725static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1726 bdaddr_t *src,
1727 bdaddr_t *dst)
1da177e4 1728{
23691d75 1729 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1730
23691d75 1731 read_lock(&chan_list_lock);
e0f0cb56 1732
23691d75 1733 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1734 if (state && c->state != state)
1da177e4
LT		 1735 continue;
1736
23691d75 1737 if (c->psm == psm) {
c2287681
IY		 1738 int src_match, dst_match;
1739 int src_any, dst_any;
1740
1da177e4 1741 /* Exact match. */
7eafc59e
MH		 1742 src_match = !bacmp(&c->src, src);
1743 dst_match = !bacmp(&c->dst, dst);
c2287681 1744 if (src_match && dst_match) {
a7567b20 1745 read_unlock(&chan_list_lock);
23691d75
GP		 1746 return c;
1747 }
1da177e4
LT		 1748
1749 /* Closest match */
7eafc59e
MH		 1750 src_any = !bacmp(&c->src, BDADDR_ANY);
1751 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1752 if ((src_match && dst_any) || (src_any && dst_match) ||
1753 (src_any && dst_any))
23691d75 1754 c1 = c;
1da177e4
LT		 1755 }
1756 }
1da177e4 1757
23691d75 1758 read_unlock(&chan_list_lock);
e0f0cb56 1759
23691d75 1760 return c1;
1da177e4
LT		 1761}
1762
8e9f9892
AG		 1763int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1764 bdaddr_t *dst, u8 dst_type)
1da177e4 1765{
1da177e4
LT		 1766 struct l2cap_conn *conn;
1767 struct hci_conn *hcon;
1768 struct hci_dev *hdev;
09ab6f4c 1769 __u8 auth_type;
44d0e48e 1770 int err;
1da177e4 1771
7eafc59e 1772 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
ab19516a 1773 dst_type, __le16_to_cpu(psm));
1da177e4 1774
7eafc59e 1775 hdev = hci_get_route(dst, &chan->src);
af05b30b 1776 if (!hdev)
1da177e4
LT		 1777 return -EHOSTUNREACH;
1778
09fd0de5 1779 hci_dev_lock(hdev);
1da177e4 1780
6be36555 1781 l2cap_chan_lock(chan);
03a00194
GP		 1782
1783 /* PSM must be odd and lsb of upper byte must be 0 */
1784 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
2d792818 1785 chan->chan_type != L2CAP_CHAN_RAW) {
03a00194
GP		 1786 err = -EINVAL;
1787 goto done;
1788 }
1789
1790 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1791 err = -EINVAL;
1792 goto done;
1793 }
1794
1795 switch (chan->mode) {
1796 case L2CAP_MODE_BASIC:
1797 break;
1798 case L2CAP_MODE_ERTM:
1799 case L2CAP_MODE_STREAMING:
1800 if (!disable_ertm)
1801 break;
1802 /* fall through */
1803 default:
1804 err = -ENOTSUPP;
1805 goto done;
1806 }
1807
0797e01d 1808 switch (chan->state) {
03a00194
GP		 1809 case BT_CONNECT:
1810 case BT_CONNECT2:
1811 case BT_CONFIG:
1812 /* Already connecting */
1813 err = 0;
1814 goto done;
1815
1816 case BT_CONNECTED:
1817 /* Already connected */
1818 err = -EISCONN;
1819 goto done;
1820
1821 case BT_OPEN:
1822 case BT_BOUND:
1823 /* Can connect */
1824 break;
1825
1826 default:
1827 err = -EBADFD;
1828 goto done;
1829 }
1830
1831 /* Set destination address and psm */
7eafc59e 1832 bacpy(&chan->dst, dst);
4f1654e0 1833 chan->dst_type = dst_type;
6be36555 1834
03a00194
GP		 1835 chan->psm = psm;
1836 chan->dcid = cid;
1da177e4 1837
4343478f 1838 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1839
f224ca5f 1840 if (bdaddr_type_is_le(dst_type))
8e9f9892 1841 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1842 chan->sec_level, auth_type);
acd7d370 1843 else
8e9f9892 1844 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1845 chan->sec_level, auth_type);
acd7d370 1846
30e76272
VT		 1847 if (IS_ERR(hcon)) {
1848 err = PTR_ERR(hcon);
1da177e4 1849 goto done;
30e76272 1850 }
1da177e4 1851
baf43251 1852 conn = l2cap_conn_add(hcon);
1da177e4 1853 if (!conn) {
76a68ba0 1854 hci_conn_drop(hcon);
30e76272 1855 err = -ENOMEM;
1da177e4
LT		 1856 goto done;
1857 }
1858
141d5706
JH		 1859 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
1860 hci_conn_drop(hcon);
1861 err = -EBUSY;
1862 goto done;
9f0caeb1
VCG		 1863 }
1864
1da177e4 1865 /* Update source addr of the socket */
7eafc59e 1866 bacpy(&chan->src, &hcon->src);
4f1654e0 1867 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1da177e4 1868
6be36555 1869 l2cap_chan_unlock(chan);
48454079 1870 l2cap_chan_add(conn, chan);
6be36555 1871 l2cap_chan_lock(chan);
48454079 1872
5ee9891d
JH		 1873 /* l2cap_chan_add takes its own ref so we can drop this one */
1874 hci_conn_drop(hcon);
1875
6be36555 1876 l2cap_state_change(chan, BT_CONNECT);
8d836d71 1877 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4
LT		 1878
1879 if (hcon->state == BT_CONNECTED) {
715ec005 1880 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1881 __clear_chan_timer(chan);
d45fc423 1882 if (l2cap_chan_check_security(chan))
6be36555 1883 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1884 } else
fc7f8a7e 1885 l2cap_do_start(chan);
1da177e4
LT		 1886 }
1887
30e76272
VT		 1888 err = 0;
1889
1da177e4 1890done:
6be36555 1891 l2cap_chan_unlock(chan);
09fd0de5 1892 hci_dev_unlock(hdev);
1da177e4
LT		 1893 hci_dev_put(hdev);
1894 return err;
1895}
1896
721c4181 1897static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1898{
721c4181 1899 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1900 monitor_timer.work);
e90bac06 1901
525cd185 1902 BT_DBG("chan %p", chan);
0e98958d 1903
6be36555
AE		 1904 l2cap_chan_lock(chan);
1905
80909e04 1906 if (!chan->conn) {
6be36555 1907 l2cap_chan_unlock(chan);
8d7e1c7f 1908 l2cap_chan_put(chan);
e90bac06
GP		 1909 return;
1910 }
1911
401bb1f7 1912 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1913
6be36555 1914 l2cap_chan_unlock(chan);
8d7e1c7f 1915 l2cap_chan_put(chan);
e90bac06
GP		 1916}
1917
721c4181 1918static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1919{
721c4181 1920 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1921 retrans_timer.work);
e90bac06 1922
49208c9c 1923 BT_DBG("chan %p", chan);
0e98958d 1924
6be36555
AE		 1925 l2cap_chan_lock(chan);
1926
80909e04
MM		 1927 if (!chan->conn) {
1928 l2cap_chan_unlock(chan);
1929 l2cap_chan_put(chan);
1930 return;
1931 }
6be36555 1932
401bb1f7 1933 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1934 l2cap_chan_unlock(chan);
8d7e1c7f 1935 l2cap_chan_put(chan);
e90bac06
GP		 1936}
1937
d660366d
GP		 1938static void l2cap_streaming_send(struct l2cap_chan *chan,
1939 struct sk_buff_head *skbs)
6840ed07 1940{
ccbb84af 1941 struct sk_buff *skb;
3733937d 1942 struct l2cap_ctrl *control;
6840ed07 1943
3733937d
MM		 1944 BT_DBG("chan %p, skbs %p", chan, skbs);
1945
b99e13ad
MM		 1946 if (__chan_is_moving(chan))
1947 return;
1948
3733937d
MM		 1949 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1950
1951 while (!skb_queue_empty(&chan->tx_q)) {
1952
1953 skb = skb_dequeue(&chan->tx_q);
1954
1955 bt_cb(skb)->control.retries = 1;
1956 control = &bt_cb(skb)->control;
1957
1958 control->reqseq = 0;
1959 control->txseq = chan->next_tx_seq;
1960
1961 __pack_control(chan, control, skb);
6840ed07 1962
47d1ec61 1963 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1964 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1965 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1966 }
1967
4343478f 1968 l2cap_do_send(chan, skb);
6840ed07 1969
b4400672 1970 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1971
836be934 1972 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1973 chan->frames_sent++;
6840ed07 1974 }
6840ed07
GP		 1975}
1976
67c9e840 1977static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1978{
1979 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1980 struct l2cap_ctrl *control;
1981 int sent = 0;
1982
1983 BT_DBG("chan %p", chan);
1c2acffb 1984
89bc500e 1985 if (chan->state != BT_CONNECTED)
c13ffa62 1986 return -ENOTCONN;
e90bac06 1987
94122bbe
MM		 1988 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1989 return 0;
1990
b99e13ad
MM		 1991 if (__chan_is_moving(chan))
1992 return 0;
1993
18a48e76
MM		 1994 while (chan->tx_send_head &&
1995 chan->unacked_frames < chan->remote_tx_win &&
1996 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1997
18a48e76 1998 skb = chan->tx_send_head;
e90bac06 1999
18a48e76
MM		 2000 bt_cb(skb)->control.retries = 1;
2001 control = &bt_cb(skb)->control;
95ffa978 2002
e2ab4353 2003 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 2004 control->final = 1;
e2ab4353 2005
18a48e76
MM		 2006 control->reqseq = chan->buffer_seq;
2007 chan->last_acked_seq = chan->buffer_seq;
2008 control->txseq = chan->next_tx_seq;
1c2acffb 2009
18a48e76 2010 __pack_control(chan, control, skb);
e90bac06 2011
47d1ec61 2012 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 2013 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
2014 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 2015 }
2016
18a48e76
MM		 2017 /* Clone after data has been modified. Data is assumed to be
2018 read-only (for locking purposes) on cloned sk_buffs.
2019 */
2020 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 2021
18a48e76
MM		 2022 if (!tx_skb)
2023 break;
1c2acffb 2024
18a48e76 2025 __set_retrans_timer(chan);
836be934
AE		 2026
2027 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 2028 chan->unacked_frames++;
6a026610 2029 chan->frames_sent++;
18a48e76 2030 sent++;
1c2acffb 2031
58d35f87
GP		 2032 if (skb_queue_is_last(&chan->tx_q, skb))
2033 chan->tx_send_head = NULL;
1c2acffb 2034 else
58d35f87 2035 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 2036
2037 l2cap_do_send(chan, tx_skb);
b4400672 2038 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 2039 }
2040
b4400672
AE		 2041 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
2042 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 2043
2044 return sent;
9e917af1
GP		 2045}
2046
e1fbd4c1
MM		 2047static void l2cap_ertm_resend(struct l2cap_chan *chan)
2048{
2049 struct l2cap_ctrl control;
2050 struct sk_buff *skb;
2051 struct sk_buff *tx_skb;
2052 u16 seq;
2053
2054 BT_DBG("chan %p", chan);
2055
2056 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2057 return;
2058
b99e13ad
MM		 2059 if (__chan_is_moving(chan))
2060 return;
2061
e1fbd4c1
MM		 2062 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
2063 seq = l2cap_seq_list_pop(&chan->retrans_list);
2064
2065 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
2066 if (!skb) {
2067 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 2068 seq);
e1fbd4c1
MM		 2069 continue;
2070 }
2071
2072 bt_cb(skb)->control.retries++;
2073 control = bt_cb(skb)->control;
2074
2075 if (chan->max_tx != 0 &&
2076 bt_cb(skb)->control.retries > chan->max_tx) {
2077 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 2078 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 2079 l2cap_seq_list_clear(&chan->retrans_list);
2080 break;
2081 }
2082
2083 control.reqseq = chan->buffer_seq;
2084 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2085 control.final = 1;
2086 else
2087 control.final = 0;
2088
2089 if (skb_cloned(skb)) {
2090 /* Cloned sk_buffs are read-only, so we need a
2091 * writeable copy
2092 */
8bcde1f2 2093 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 2094 } else {
8bcde1f2 2095 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 2096 }
2097
2098 if (!tx_skb) {
2099 l2cap_seq_list_clear(&chan->retrans_list);
2100 break;
2101 }
2102
2103 /* Update skb contents */
2104 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2105 put_unaligned_le32(__pack_extended_control(&control),
2106 tx_skb->data + L2CAP_HDR_SIZE);
2107 } else {
2108 put_unaligned_le16(__pack_enhanced_control(&control),
2109 tx_skb->data + L2CAP_HDR_SIZE);
2110 }
2111
2112 if (chan->fcs == L2CAP_FCS_CRC16) {
2113 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2114 put_unaligned_le16(fcs, skb_put(tx_skb,
2115 L2CAP_FCS_SIZE));
2116 }
2117
2118 l2cap_do_send(chan, tx_skb);
2119
2120 BT_DBG("Resent txseq %d", control.txseq);
2121
2122 chan->last_acked_seq = chan->buffer_seq;
2123 }
2124}
2125
f80842a8
MM		 2126static void l2cap_retransmit(struct l2cap_chan *chan,
2127 struct l2cap_ctrl *control)
2128{
2129 BT_DBG("chan %p, control %p", chan, control);
2130
2131 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2132 l2cap_ertm_resend(chan);
2133}
2134
d2a7ac5d
MM		 2135static void l2cap_retransmit_all(struct l2cap_chan *chan,
2136 struct l2cap_ctrl *control)
2137{
e1fbd4c1
MM		 2138 struct sk_buff *skb;
2139
2140 BT_DBG("chan %p, control %p", chan, control);
2141
2142 if (control->poll)
2143 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2144
2145 l2cap_seq_list_clear(&chan->retrans_list);
2146
2147 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2148 return;
2149
2150 if (chan->unacked_frames) {
2151 skb_queue_walk(&chan->tx_q, skb) {
2152 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2153 skb == chan->tx_send_head)
e1fbd4c1
MM		 2154 break;
2155 }
2156
2157 skb_queue_walk_from(&chan->tx_q, skb) {
2158 if (skb == chan->tx_send_head)
2159 break;
2160
2161 l2cap_seq_list_append(&chan->retrans_list,
2162 bt_cb(skb)->control.txseq);
2163 }
2164
2165 l2cap_ertm_resend(chan);
2166 }
d2a7ac5d
MM		 2167}
2168
0a0aba42 2169static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2170{
0a0aba42
MM		 2171 struct l2cap_ctrl control;
2172 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2173 chan->last_acked_seq);
2174 int threshold;
9e917af1 2175
0a0aba42
MM		 2176 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2177 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2178
0a0aba42
MM		 2179 memset(&control, 0, sizeof(control));
2180 control.sframe = 1;
dfc909be 2181
0a0aba42
MM		 2182 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2183 chan->rx_state == L2CAP_RX_STATE_RECV) {
2184 __clear_ack_timer(chan);
2185 control.super = L2CAP_SUPER_RNR;
2186 control.reqseq = chan->buffer_seq;
2187 l2cap_send_sframe(chan, &control);
2188 } else {
2189 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2190 l2cap_ertm_send(chan);
2191 /* If any i-frames were sent, they included an ack */
2192 if (chan->buffer_seq == chan->last_acked_seq)
2193 frames_to_ack = 0;
2194 }
dfc909be 2195
c20f8e35 2196 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2197 * Calculate without mul or div
2198 */
c20f8e35 2199 threshold = chan->ack_win;
0a0aba42
MM		 2200 threshold += threshold << 1;
2201 threshold >>= 2;
2202
b4400672 2203 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2204 threshold);
2205
2206 if (frames_to_ack >= threshold) {
2207 __clear_ack_timer(chan);
2208 control.super = L2CAP_SUPER_RR;
2209 control.reqseq = chan->buffer_seq;
2210 l2cap_send_sframe(chan, &control);
2211 frames_to_ack = 0;
2212 }
1c2acffb 2213
0a0aba42
MM		 2214 if (frames_to_ack)
2215 __set_ack_timer(chan);
2216 }
b17e73bb
SJ		 2217}
2218
04124681
GP		 2219static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2220 struct msghdr *msg, int len,
2221 int count, struct sk_buff *skb)
1c2acffb 2222{
0952a57a 2223 struct l2cap_conn *conn = chan->conn;
1c2acffb 2224 struct sk_buff **frag;
90338947 2225 int sent = 0;
1da177e4 2226
59203a21 2227 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2228 return -EFAULT;
1da177e4
LT		 2229
2230 sent += count;
2231 len -= count;
2232
2233 /* Continuation fragments (no L2CAP header) */
2234 frag = &skb_shinfo(skb)->frag_list;
2235 while (len) {
fbe00700
GP		 2236 struct sk_buff *tmp;
2237
1da177e4
LT		 2238 count = min_t(unsigned int, conn->mtu, len);
2239
fbe00700
GP		 2240 tmp = chan->ops->alloc_skb(chan, count,
2241 msg->msg_flags & MSG_DONTWAIT);
2242 if (IS_ERR(tmp))
2243 return PTR_ERR(tmp);
2244
2245 *frag = tmp;
2f7719ce 2246
1c2acffb
GP		 2247 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2248 return -EFAULT;
1da177e4 2249
5e59b791
LAD		 2250 (*frag)->priority = skb->priority;
2251
1da177e4
LT		 2252 sent += count;
2253 len -= count;
2254
2d0ed3d5
GP		 2255 skb->len += (*frag)->len;
2256 skb->data_len += (*frag)->len;
2257
1da177e4
LT		 2258 frag = &(*frag)->next;
2259 }
1da177e4
LT		 2260
2261 return sent;
1c2acffb 2262}
1da177e4 2263
5e59b791 2264static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2265 struct msghdr *msg, size_t len,
2266 u32 priority)
1c2acffb 2267{
8c1d787b 2268 struct l2cap_conn *conn = chan->conn;
1c2acffb 2269 struct sk_buff *skb;
03a51213 2270 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2271 struct l2cap_hdr *lh;
2272
43b1b8df
MH		 2273 BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan,
2274 __le16_to_cpu(chan->psm), len, priority);
1c2acffb
GP		 2275
2276 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2277
2278 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2279 msg->msg_flags & MSG_DONTWAIT);
2280 if (IS_ERR(skb))
2281 return skb;
1c2acffb 2282
5e59b791
LAD		 2283 skb->priority = priority;
2284
1c2acffb
GP		 2285 /* Create L2CAP header */
2286 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2287 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2288 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2289 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2290
0952a57a 2291 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2292 if (unlikely(err < 0)) {
2293 kfree_skb(skb);
2294 return ERR_PTR(err);
2295 }
2296 return skb;
2297}
2298
5e59b791 2299static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2300 struct msghdr *msg, size_t len,
2301 u32 priority)
1c2acffb 2302{
8c1d787b 2303 struct l2cap_conn *conn = chan->conn;
1c2acffb 2304 struct sk_buff *skb;
f2ba7fae 2305 int err, count;
1c2acffb
GP		 2306 struct l2cap_hdr *lh;
2307
b4400672 2308 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2309
f2ba7fae 2310 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2311
f2ba7fae 2312 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2313 msg->msg_flags & MSG_DONTWAIT);
2314 if (IS_ERR(skb))
2315 return skb;
1c2acffb 2316
5e59b791
LAD		 2317 skb->priority = priority;
2318
1c2acffb
GP		 2319 /* Create L2CAP header */
2320 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2321 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2322 lh->len = cpu_to_le16(len);
1c2acffb 2323
0952a57a 2324 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2325 if (unlikely(err < 0)) {
2326 kfree_skb(skb);
2327 return ERR_PTR(err);
2328 }
2329 return skb;
2330}
2331
ab0ff76d 2332static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2333 struct msghdr *msg, size_t len,
2334 u16 sdulen)
1c2acffb 2335{
8c1d787b 2336 struct l2cap_conn *conn = chan->conn;
1c2acffb 2337 struct sk_buff *skb;
e4ca6d98 2338 int err, count, hlen;
1c2acffb
GP		 2339 struct l2cap_hdr *lh;
2340
b4400672 2341 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2342
0ee0d208
GP		 2343 if (!conn)
2344 return ERR_PTR(-ENOTCONN);
2345
ba7aa64f 2346 hlen = __ertm_hdr_size(chan);
e4ca6d98 2347
c74e560c 2348 if (sdulen)
03a51213 2349 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2350
47d1ec61 2351 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2352 hlen += L2CAP_FCS_SIZE;
fcc203c3 2353
1c2acffb 2354 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2355
2356 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2357 msg->msg_flags & MSG_DONTWAIT);
2358 if (IS_ERR(skb))
2359 return skb;
1c2acffb
GP		 2360
2361 /* Create L2CAP header */
2362 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2363 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2364 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2365
18a48e76
MM		 2366 /* Control header is populated later */
2367 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2368 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2369 else
2370 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2371
c74e560c 2372 if (sdulen)
03a51213 2373 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2374
0952a57a 2375 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2376 if (unlikely(err < 0)) {
2377 kfree_skb(skb);
2378 return ERR_PTR(err);
2379 }
e90bac06 2380
18a48e76 2381 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2382 bt_cb(skb)->control.retries = 0;
1c2acffb 2383 return skb;
1da177e4
LT		 2384}
2385
94122bbe
MM		 2386static int l2cap_segment_sdu(struct l2cap_chan *chan,
2387 struct sk_buff_head *seg_queue,
2388 struct msghdr *msg, size_t len)
c74e560c 2389{
c74e560c 2390 struct sk_buff *skb;
94122bbe
MM		 2391 u16 sdu_len;
2392 size_t pdu_len;
94122bbe 2393 u8 sar;
c74e560c 2394
b4400672 2395 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2396
94122bbe
MM		 2397 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2398 * so fragmented skbs are not used. The HCI layer's handling
2399 * of fragmented skbs is not compatible with ERTM's queueing.
2400 */
c74e560c 2401
94122bbe
MM		 2402 /* PDU size is derived from the HCI MTU */
2403 pdu_len = chan->conn->mtu;
c74e560c 2404
a549574d
MM		 2405 /* Constrain PDU size for BR/EDR connections */
2406 if (!chan->hs_hcon)
2407 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2408
2409 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2410 if (chan->fcs)
2411 pdu_len -= L2CAP_FCS_SIZE;
2412
ba7aa64f 2413 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2414
2415 /* Remote device may have requested smaller PDUs */
2416 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2417
2418 if (len <= pdu_len) {
2419 sar = L2CAP_SAR_UNSEGMENTED;
2420 sdu_len = 0;
2421 pdu_len = len;
2422 } else {
2423 sar = L2CAP_SAR_START;
2424 sdu_len = len;
2425 pdu_len -= L2CAP_SDULEN_SIZE;
2426 }
2427
2428 while (len > 0) {
2429 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2430
c74e560c 2431 if (IS_ERR(skb)) {
94122bbe 2432 __skb_queue_purge(seg_queue);
c74e560c
GP		 2433 return PTR_ERR(skb);
2434 }
2435
94122bbe
MM		 2436 bt_cb(skb)->control.sar = sar;
2437 __skb_queue_tail(seg_queue, skb);
2438
2439 len -= pdu_len;
2440 if (sdu_len) {
2441 sdu_len = 0;
2442 pdu_len += L2CAP_SDULEN_SIZE;
2443 }
2444
2445 if (len <= pdu_len) {
2446 sar = L2CAP_SAR_END;
2447 pdu_len = len;
2448 } else {
2449 sar = L2CAP_SAR_CONTINUE;
2450 }
c74e560c 2451 }
c74e560c 2452
f0f62799 2453 return 0;
c74e560c
GP		 2454}
2455
5e59b791 2456int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2457 u32 priority)
9a91a04a 2458{
9a91a04a 2459 struct sk_buff *skb;
9a91a04a 2460 int err;
94122bbe 2461 struct sk_buff_head seg_queue;
9a91a04a
GP		 2462
2463 /* Connectionless channel */
715ec005 2464 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2465 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2466 if (IS_ERR(skb))
2467 return PTR_ERR(skb);
2468
2469 l2cap_do_send(chan, skb);
2470 return len;
2471 }
2472
2473 switch (chan->mode) {
2474 case L2CAP_MODE_BASIC:
2475 /* Check outgoing MTU */
2476 if (len > chan->omtu)
2477 return -EMSGSIZE;
2478
2479 /* Create a basic PDU */
5e59b791 2480 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2481 if (IS_ERR(skb))
2482 return PTR_ERR(skb);
2483
2484 l2cap_do_send(chan, skb);
2485 err = len;
2486 break;
2487
2488 case L2CAP_MODE_ERTM:
2489 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2490 /* Check outgoing MTU */
2491 if (len > chan->omtu) {
2492 err = -EMSGSIZE;
2493 break;
2494 }
9a91a04a 2495
94122bbe 2496 __skb_queue_head_init(&seg_queue);
9a91a04a 2497
94122bbe
MM		 2498 /* Do segmentation before calling in to the state machine,
2499 * since it's possible to block while waiting for memory
2500 * allocation.
2501 */
2502 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2503
94122bbe
MM		 2504 /* The channel could have been closed while segmenting,
2505 * check that it is still connected.
2506 */
2507 if (chan->state != BT_CONNECTED) {
2508 __skb_queue_purge(&seg_queue);
2509 err = -ENOTCONN;
9a91a04a
GP		 2510 }
2511
94122bbe 2512 if (err)
9a91a04a 2513 break;
9a91a04a 2514
3733937d 2515 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2516 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2517 else
d660366d 2518 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2519
d660366d 2520 err = len;
9a91a04a 2521
94122bbe
MM		 2522 /* If the skbs were not queued for sending, they'll still be in
2523 * seg_queue and need to be purged.
2524 */
2525 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2526 break;
2527
2528 default:
2529 BT_DBG("bad state %1.1x", chan->mode);
2530 err = -EBADFD;
2531 }
2532
2533 return err;
2534}
2535
d2a7ac5d
MM		 2536static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2537{
bed68bde
MM		 2538 struct l2cap_ctrl control;
2539 u16 seq;
2540
b4400672 2541 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2542
2543 memset(&control, 0, sizeof(control));
2544 control.sframe = 1;
2545 control.super = L2CAP_SUPER_SREJ;
2546
2547 for (seq = chan->expected_tx_seq; seq != txseq;
2548 seq = __next_seq(chan, seq)) {
2549 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2550 control.reqseq = seq;
2551 l2cap_send_sframe(chan, &control);
2552 l2cap_seq_list_append(&chan->srej_list, seq);
2553 }
2554 }
2555
2556 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2557}
2558
2559static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2560{
bed68bde
MM		 2561 struct l2cap_ctrl control;
2562
2563 BT_DBG("chan %p", chan);
2564
2565 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2566 return;
2567
2568 memset(&control, 0, sizeof(control));
2569 control.sframe = 1;
2570 control.super = L2CAP_SUPER_SREJ;
2571 control.reqseq = chan->srej_list.tail;
2572 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2573}
2574
2575static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2576{
bed68bde
MM		 2577 struct l2cap_ctrl control;
2578 u16 initial_head;
2579 u16 seq;
2580
b4400672 2581 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2582
2583 memset(&control, 0, sizeof(control));
2584 control.sframe = 1;
2585 control.super = L2CAP_SUPER_SREJ;
2586
2587 /* Capture initial list head to allow only one pass through the list. */
2588 initial_head = chan->srej_list.head;
2589
2590 do {
2591 seq = l2cap_seq_list_pop(&chan->srej_list);
2592 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2593 break;
2594
2595 control.reqseq = seq;
2596 l2cap_send_sframe(chan, &control);
2597 l2cap_seq_list_append(&chan->srej_list, seq);
2598 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2599}
2600
608bcc6d
MM		 2601static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2602{
2603 struct sk_buff *acked_skb;
2604 u16 ackseq;
2605
b4400672 2606 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2607
2608 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2609 return;
2610
b4400672 2611 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2612 chan->expected_ack_seq, chan->unacked_frames);
2613
2614 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2615 ackseq = __next_seq(chan, ackseq)) {
2616
2617 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2618 if (acked_skb) {
2619 skb_unlink(acked_skb, &chan->tx_q);
2620 kfree_skb(acked_skb);
2621 chan->unacked_frames--;
2622 }
2623 }
2624
2625 chan->expected_ack_seq = reqseq;
2626
2627 if (chan->unacked_frames == 0)
2628 __clear_retrans_timer(chan);
2629
b4400672 2630 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2631}
2632
2633static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2634{
2635 BT_DBG("chan %p", chan);
2636
2637 chan->expected_tx_seq = chan->buffer_seq;
2638 l2cap_seq_list_clear(&chan->srej_list);
2639 skb_queue_purge(&chan->srej_q);
2640 chan->rx_state = L2CAP_RX_STATE_RECV;
2641}
2642
d660366d
GP		 2643static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2644 struct l2cap_ctrl *control,
2645 struct sk_buff_head *skbs, u8 event)
608bcc6d 2646{
608bcc6d
MM		 2647 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2648 event);
2649
2650 switch (event) {
2651 case L2CAP_EV_DATA_REQUEST:
2652 if (chan->tx_send_head == NULL)
2653 chan->tx_send_head = skb_peek(skbs);
2654
2655 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2656 l2cap_ertm_send(chan);
2657 break;
2658 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2659 BT_DBG("Enter LOCAL_BUSY");
2660 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2661
2662 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2663 /* The SREJ_SENT state must be aborted if we are to
2664 * enter the LOCAL_BUSY state.
2665 */
2666 l2cap_abort_rx_srej_sent(chan);
2667 }
2668
2669 l2cap_send_ack(chan);
2670
2671 break;
2672 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2673 BT_DBG("Exit LOCAL_BUSY");
2674 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2675
2676 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2677 struct l2cap_ctrl local_control;
2678
2679 memset(&local_control, 0, sizeof(local_control));
2680 local_control.sframe = 1;
2681 local_control.super = L2CAP_SUPER_RR;
2682 local_control.poll = 1;
2683 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2684 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2685
2686 chan->retry_count = 1;
2687 __set_monitor_timer(chan);
2688 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2689 }
2690 break;
2691 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2692 l2cap_process_reqseq(chan, control->reqseq);
2693 break;
2694 case L2CAP_EV_EXPLICIT_POLL:
2695 l2cap_send_rr_or_rnr(chan, 1);
2696 chan->retry_count = 1;
2697 __set_monitor_timer(chan);
2698 __clear_ack_timer(chan);
2699 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2700 break;
2701 case L2CAP_EV_RETRANS_TO:
2702 l2cap_send_rr_or_rnr(chan, 1);
2703 chan->retry_count = 1;
2704 __set_monitor_timer(chan);
2705 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2706 break;
2707 case L2CAP_EV_RECV_FBIT:
2708 /* Nothing to process */
2709 break;
2710 default:
2711 break;
2712 }
608bcc6d
MM		 2713}
2714
d660366d
GP		 2715static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2716 struct l2cap_ctrl *control,
2717 struct sk_buff_head *skbs, u8 event)
608bcc6d 2718{
608bcc6d
MM		 2719 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2720 event);
2721
2722 switch (event) {
2723 case L2CAP_EV_DATA_REQUEST:
2724 if (chan->tx_send_head == NULL)
2725 chan->tx_send_head = skb_peek(skbs);
2726 /* Queue data, but don't send. */
2727 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2728 break;
2729 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2730 BT_DBG("Enter LOCAL_BUSY");
2731 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2732
2733 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2734 /* The SREJ_SENT state must be aborted if we are to
2735 * enter the LOCAL_BUSY state.
2736 */
2737 l2cap_abort_rx_srej_sent(chan);
2738 }
2739
2740 l2cap_send_ack(chan);
2741
2742 break;
2743 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2744 BT_DBG("Exit LOCAL_BUSY");
2745 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2746
2747 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2748 struct l2cap_ctrl local_control;
2749 memset(&local_control, 0, sizeof(local_control));
2750 local_control.sframe = 1;
2751 local_control.super = L2CAP_SUPER_RR;
2752 local_control.poll = 1;
2753 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2754 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2755
2756 chan->retry_count = 1;
2757 __set_monitor_timer(chan);
2758 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2759 }
2760 break;
2761 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2762 l2cap_process_reqseq(chan, control->reqseq);
2763
2764 /* Fall through */
2765
2766 case L2CAP_EV_RECV_FBIT:
2767 if (control && control->final) {
2768 __clear_monitor_timer(chan);
2769 if (chan->unacked_frames > 0)
2770 __set_retrans_timer(chan);
2771 chan->retry_count = 0;
2772 chan->tx_state = L2CAP_TX_STATE_XMIT;
2773 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2774 }
2775 break;
2776 case L2CAP_EV_EXPLICIT_POLL:
2777 /* Ignore */
2778 break;
2779 case L2CAP_EV_MONITOR_TO:
2780 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2781 l2cap_send_rr_or_rnr(chan, 1);
2782 __set_monitor_timer(chan);
2783 chan->retry_count++;
2784 } else {
5e4e3972 2785 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2786 }
2787 break;
2788 default:
2789 break;
2790 }
608bcc6d
MM		 2791}
2792
d660366d
GP		 2793static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2794 struct sk_buff_head *skbs, u8 event)
608bcc6d 2795{
608bcc6d
MM		 2796 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2797 chan, control, skbs, event, chan->tx_state);
2798
2799 switch (chan->tx_state) {
2800 case L2CAP_TX_STATE_XMIT:
d660366d 2801 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2802 break;
2803 case L2CAP_TX_STATE_WAIT_F:
d660366d 2804 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2805 break;
2806 default:
2807 /* Ignore event */
2808 break;
2809 }
608bcc6d
MM		 2810}
2811
4b51dae9
MM		 2812static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2813 struct l2cap_ctrl *control)
2814{
2815 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2816 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2817}
2818
f80842a8
MM		 2819static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2820 struct l2cap_ctrl *control)
2821{
2822 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2823 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2824}
2825
1da177e4
LT		 2826/* Copy frame to all raw sockets on that connection */
2827static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2828{
1da177e4 2829 struct sk_buff *nskb;
48454079 2830 struct l2cap_chan *chan;
1da177e4
LT		 2831
2832 BT_DBG("conn %p", conn);
2833
3df91ea2 2834 mutex_lock(&conn->chan_lock);
3d57dc68 2835
3df91ea2 2836 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 2837 struct sock *sk = chan->sk;
715ec005 2838 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2839 continue;
2840
2841 /* Don't send frame to the socket it came from */
2842 if (skb->sk == sk)
2843 continue;
8bcde1f2 2844 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2845 if (!nskb)
1da177e4
LT		 2846 continue;
2847
80b98027 2848 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2849 kfree_skb(nskb);
2850 }
3d57dc68 2851
3df91ea2 2852 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2853}
2854
2855/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2856static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2857 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2858{
2859 struct sk_buff *skb, **frag;
2860 struct l2cap_cmd_hdr *cmd;
2861 struct l2cap_hdr *lh;
2862 int len, count;
2863
b4400672
AE		 2864 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2865 conn, code, ident, dlen);
1da177e4 2866
300b962e
AL		 2867 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2868 return NULL;
2869
1da177e4
LT		 2870 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2871 count = min_t(unsigned int, conn->mtu, len);
2872
8bcde1f2 2873 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2874 if (!skb)
2875 return NULL;
2876
2877 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2878 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2879
2880 if (conn->hcon->type == LE_LINK)
ac73498c 2881 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2882 else
ac73498c 2883 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2884
2885 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2886 cmd->code = code;
2887 cmd->ident = ident;
aca3192c 2888 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2889
2890 if (dlen) {
2891 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2892 memcpy(skb_put(skb, count), data, count);
2893 data += count;
2894 }
2895
2896 len -= skb->len;
2897
2898 /* Continuation fragments (no L2CAP header) */
2899 frag = &skb_shinfo(skb)->frag_list;
2900 while (len) {
2901 count = min_t(unsigned int, conn->mtu, len);
2902
8bcde1f2 2903 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2904 if (!*frag)
2905 goto fail;
2906
2907 memcpy(skb_put(*frag, count), data, count);
2908
2909 len -= count;
2910 data += count;
2911
2912 frag = &(*frag)->next;
2913 }
2914
2915 return skb;
2916
2917fail:
2918 kfree_skb(skb);
2919 return NULL;
2920}
2921
2d792818
GP		 2922static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2923 unsigned long *val)
1da177e4
LT		 2924{
2925 struct l2cap_conf_opt *opt = *ptr;
2926 int len;
2927
2928 len = L2CAP_CONF_OPT_SIZE + opt->len;
2929 *ptr += len;
2930
2931 *type = opt->type;
2932 *olen = opt->len;
2933
2934 switch (opt->len) {
2935 case 1:
2936 *val = *((u8 *) opt->val);
2937 break;
2938
2939 case 2:
bfaaeb3e 2940 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2941 break;
2942
2943 case 4:
bfaaeb3e 2944 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2945 break;
2946
2947 default:
2948 *val = (unsigned long) opt->val;
2949 break;
2950 }
2951
b4400672 2952 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2953 return len;
2954}
2955
1da177e4
LT		 2956static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2957{
2958 struct l2cap_conf_opt *opt = *ptr;
2959
b4400672 2960 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2961
2962 opt->type = type;
2963 opt->len = len;
2964
2965 switch (len) {
2966 case 1:
2967 *((u8 *) opt->val) = val;
2968 break;
2969
2970 case 2:
4f8b691c 2971 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2972 break;
2973
2974 case 4:
4f8b691c 2975 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2976 break;
2977
2978 default:
2979 memcpy(opt->val, (void *) val, len);
2980 break;
2981 }
2982
2983 *ptr += L2CAP_CONF_OPT_SIZE + len;
2984}
2985
f89cef09
AE		 2986static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2987{
2988 struct l2cap_conf_efs efs;
2989
1ec918ce 2990 switch (chan->mode) {
f89cef09
AE		 2991 case L2CAP_MODE_ERTM:
2992 efs.id = chan->local_id;
2993 efs.stype = chan->local_stype;
2994 efs.msdu = cpu_to_le16(chan->local_msdu);
2995 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 2996 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 2997 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 2998 break;
2999
3000 case L2CAP_MODE_STREAMING:
3001 efs.id = 1;
3002 efs.stype = L2CAP_SERV_BESTEFFORT;
3003 efs.msdu = cpu_to_le16(chan->local_msdu);
3004 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3005 efs.acc_lat = 0;
3006 efs.flush_to = 0;
3007 break;
3008
3009 default:
3010 return;
3011 }
3012
3013 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3014 (unsigned long) &efs);
f89cef09
AE		 3015}
3016
721c4181 3017static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3018{
721c4181 3019 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3020 ack_timer.work);
3021 u16 frames_to_ack;
c1b4f43b 3022
2fb9b3d4
GP		 3023 BT_DBG("chan %p", chan);
3024
6be36555
AE		 3025 l2cap_chan_lock(chan);
3026
0362520b
MM		 3027 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3028 chan->last_acked_seq);
6be36555 3029
0362520b
MM		 3030 if (frames_to_ack)
3031 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3032
0362520b 3033 l2cap_chan_unlock(chan);
09bfb2ee 3034 l2cap_chan_put(chan);
c1b4f43b
GP		 3035}
3036
466f8004 3037int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3038{
3c588192
MM		 3039 int err;
3040
105bdf9e
MM		 3041 chan->next_tx_seq = 0;
3042 chan->expected_tx_seq = 0;
42e5c802 3043 chan->expected_ack_seq = 0;
6a026610 3044 chan->unacked_frames = 0;
42e5c802 3045 chan->buffer_seq = 0;
6a026610 3046 chan->frames_sent = 0;
105bdf9e
MM		 3047 chan->last_acked_seq = 0;
3048 chan->sdu = NULL;
3049 chan->sdu_last_frag = NULL;
3050 chan->sdu_len = 0;
3051
d34c34fb
MM		 3052 skb_queue_head_init(&chan->tx_q);
3053
6ed971ca
MH		 3054 chan->local_amp_id = AMP_ID_BREDR;
3055 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3056 chan->move_state = L2CAP_MOVE_STABLE;
3057 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3058
105bdf9e
MM		 3059 if (chan->mode != L2CAP_MODE_ERTM)
3060 return 0;
3061
3062 chan->rx_state = L2CAP_RX_STATE_RECV;
3063 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3064
721c4181
GP		 3065 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3066 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3067 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3068
f1c6775b 3069 skb_queue_head_init(&chan->srej_q);
1890d36b 3070
3c588192
MM		 3071 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3072 if (err < 0)
3073 return err;
3074
9dc9affc
MM		 3075 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3076 if (err < 0)
3077 l2cap_seq_list_free(&chan->srej_list);
3078
3079 return err;
0565c1c2
GP		 3080}
3081
f2fcfcd6
GP		 3082static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3083{
3084 switch (mode) {
3085 case L2CAP_MODE_STREAMING:
3086 case L2CAP_MODE_ERTM:
3087 if (l2cap_mode_supported(mode, remote_feat_mask))
3088 return mode;
3089 /* fall through */
3090 default:
3091 return L2CAP_MODE_BASIC;
3092 }
3093}
3094
848566b3 3095static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3096{
848566b3 3097 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
6327eb98
AE		 3098}
3099
848566b3 3100static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3101{
848566b3 3102 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
f89cef09
AE		 3103}
3104
36c86c85
MM		 3105static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3106 struct l2cap_conf_rfc *rfc)
3107{
6ed971ca 3108 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3109 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3110
3111 /* Class 1 devices have must have ERTM timeouts
3112 * exceeding the Link Supervision Timeout. The
3113 * default Link Supervision Timeout for AMP
3114 * controllers is 10 seconds.
3115 *
3116 * Class 1 devices use 0xffffffff for their
3117 * best-effort flush timeout, so the clamping logic
3118 * will result in a timeout that meets the above
3119 * requirement. ERTM timeouts are 16-bit values, so
3120 * the maximum timeout is 65.535 seconds.
3121 */
3122
3123 /* Convert timeout to milliseconds and round */
3124 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3125
3126 /* This is the recommended formula for class 2 devices
3127 * that start ERTM timers when packets are sent to the
3128 * controller.
3129 */
3130 ertm_to = 3 * ertm_to + 500;
3131
3132 if (ertm_to > 0xffff)
3133 ertm_to = 0xffff;
3134
3135 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3136 rfc->monitor_timeout = rfc->retrans_timeout;
3137 } else {
3138 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3139 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3140 }
3141}
3142
6327eb98
AE		 3143static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3144{
3145 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3146 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3147 /* use extended control field */
3148 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3149 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3150 } else {
6327eb98 3151 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3152 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3153 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3154 }
c20f8e35 3155 chan->ack_win = chan->tx_win;
6327eb98
AE		 3156}
3157
710f9b0a 3158static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3159{
1da177e4 3160 struct l2cap_conf_req *req = data;
0c1bc5c6 3161 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3162 void *ptr = req->data;
c8f79162 3163 u16 size;
1da177e4 3164
49208c9c 3165 BT_DBG("chan %p", chan);
1da177e4 3166
73ffa904 3167 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3168 goto done;
3169
0c1bc5c6 3170 switch (chan->mode) {
f2fcfcd6
GP		 3171 case L2CAP_MODE_STREAMING:
3172 case L2CAP_MODE_ERTM:
c1360a1c 3173 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3174 break;
85eb53c6 3175
848566b3 3176 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3177 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3178
2ba13ed6 3179 /* fall through */
f2fcfcd6 3180 default:
8c1d787b 3181 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3182 break;
3183 }
3184
3185done:
0c1bc5c6
GP		 3186 if (chan->imtu != L2CAP_DEFAULT_MTU)
3187 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3188
0c1bc5c6 3189 switch (chan->mode) {
65c7c491 3190 case L2CAP_MODE_BASIC:
8c1d787b 3191 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3192 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3193 break;
3194
62547752
GP		 3195 rfc.mode = L2CAP_MODE_BASIC;
3196 rfc.txwin_size = 0;
3197 rfc.max_transmit = 0;
3198 rfc.retrans_timeout = 0;
3199 rfc.monitor_timeout = 0;
3200 rfc.max_pdu_size = 0;
3201
63406504 3202 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3203 (unsigned long) &rfc);
65c7c491
MH		 3204 break;
3205
3206 case L2CAP_MODE_ERTM:
3207 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3208 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3209
3210 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3211
3212 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3213 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3214 L2CAP_FCS_SIZE);
c8f79162 3215 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3216
6327eb98
AE		 3217 l2cap_txwin_setup(chan);
3218
3219 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3220 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3221
63406504 3222 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3223 (unsigned long) &rfc);
63406504 3224
f89cef09
AE		 3225 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3226 l2cap_add_opt_efs(&ptr, chan);
3227
6327eb98
AE		 3228 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3229 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3230 chan->tx_win);
60918918
AE		 3231
3232 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3233 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3234 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3235 chan->fcs = L2CAP_FCS_NONE;
3236 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3237 chan->fcs);
3238 }
f2fcfcd6
GP		 3239 break;
3240
3241 case L2CAP_MODE_STREAMING:
273759e2 3242 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3243 rfc.mode = L2CAP_MODE_STREAMING;
3244 rfc.txwin_size = 0;
3245 rfc.max_transmit = 0;
3246 rfc.retrans_timeout = 0;
3247 rfc.monitor_timeout = 0;
c8f79162
AE		 3248
3249 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3250 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3251 L2CAP_FCS_SIZE);
c8f79162 3252 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3253
63406504 3254 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3255 (unsigned long) &rfc);
63406504 3256
f89cef09
AE		 3257 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3258 l2cap_add_opt_efs(&ptr, chan);
3259
60918918
AE		 3260 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3261 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3262 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3263 chan->fcs = L2CAP_FCS_NONE;
3264 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3265 chan->fcs);
3266 }
65c7c491
MH		 3267 break;
3268 }
1da177e4 3269
fe4128e0 3270 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3271 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3272
3273 return ptr - data;
3274}
3275
73ffa904 3276static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3277{
5dee9e7c
MH		 3278 struct l2cap_conf_rsp *rsp = data;
3279 void *ptr = rsp->data;
73ffa904
GP		 3280 void *req = chan->conf_req;
3281 int len = chan->conf_len;
5dee9e7c
MH		 3282 int type, hint, olen;
3283 unsigned long val;
6464f35f 3284 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3285 struct l2cap_conf_efs efs;
3286 u8 remote_efs = 0;
861d6882 3287 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3288 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3289 u16 size;
1da177e4 3290
73ffa904 3291 BT_DBG("chan %p", chan);
820ae1b8 3292
5dee9e7c
MH		 3293 while (len >= L2CAP_CONF_OPT_SIZE) {
3294 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3295
589d2746 3296 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3297 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3298
3299 switch (type) {
3300 case L2CAP_CONF_MTU:
861d6882 3301 mtu = val;
5dee9e7c
MH		 3302 break;
3303
3304 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3305 chan->flush_to = val;
5dee9e7c
MH		 3306 break;
3307
3308 case L2CAP_CONF_QOS:
3309 break;
3310
6464f35f
MH		 3311 case L2CAP_CONF_RFC:
3312 if (olen == sizeof(rfc))
3313 memcpy(&rfc, (void *) val, olen);
3314 break;
3315
fcc203c3
GP		 3316 case L2CAP_CONF_FCS:
3317 if (val == L2CAP_FCS_NONE)
f2592d3e 3318 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3319 break;
fcc203c3 3320
42dceae2
AE		 3321 case L2CAP_CONF_EFS:
3322 remote_efs = 1;
3323 if (olen == sizeof(efs))
3324 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3325 break;
3326
6327eb98 3327 case L2CAP_CONF_EWS:
848566b3 3328 if (!chan->conn->hs_enabled)
6327eb98 3329 return -ECONNREFUSED;
fcc203c3 3330
6327eb98
AE		 3331 set_bit(FLAG_EXT_CTRL, &chan->flags);
3332 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3333 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3334 chan->remote_tx_win = val;
fcc203c3
GP		 3335 break;
3336
5dee9e7c
MH		 3337 default:
3338 if (hint)
3339 break;
3340
3341 result = L2CAP_CONF_UNKNOWN;
3342 *((u8 *) ptr++) = type;
3343 break;
3344 }
3345 }
3346
73ffa904 3347 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3348 goto done;
3349
0c1bc5c6 3350 switch (chan->mode) {
f2fcfcd6
GP		 3351 case L2CAP_MODE_STREAMING:
3352 case L2CAP_MODE_ERTM:
c1360a1c 3353 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3354 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3355 chan->conn->feat_mask);
85eb53c6
GP		 3356 break;
3357 }
3358
42dceae2 3359 if (remote_efs) {
848566b3 3360 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3361 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3362 else
3363 return -ECONNREFUSED;
3364 }
3365
0c1bc5c6 3366 if (chan->mode != rfc.mode)
f2fcfcd6 3367 return -ECONNREFUSED;
742e519b 3368
f2fcfcd6 3369 break;
f2fcfcd6
GP		 3370 }
3371
3372done:
0c1bc5c6 3373 if (chan->mode != rfc.mode) {
f2fcfcd6 3374 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3375 rfc.mode = chan->mode;
f2fcfcd6 3376
73ffa904 3377 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3378 return -ECONNREFUSED;
3379
2d792818
GP		 3380 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3381 (unsigned long) &rfc);
f2fcfcd6
GP		 3382 }
3383
5dee9e7c
MH		 3384 if (result == L2CAP_CONF_SUCCESS) {
3385 /* Configure output options and let the other side know
3386 * which ones we don't like. */
3387
f2fcfcd6
GP		 3388 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3389 result = L2CAP_CONF_UNACCEPT;
3390 else {
0c1bc5c6 3391 chan->omtu = mtu;
c1360a1c 3392 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3393 }
0c1bc5c6 3394 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3395
42dceae2
AE		 3396 if (remote_efs) {
3397 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3398 efs.stype != L2CAP_SERV_NOTRAFIC &&
3399 efs.stype != chan->local_stype) {
42dceae2
AE		 3400
3401 result = L2CAP_CONF_UNACCEPT;
3402
3403 if (chan->num_conf_req >= 1)
3404 return -ECONNREFUSED;
3405
3406 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3407 sizeof(efs),
3408 (unsigned long) &efs);
0e8b207e 3409 } else {
3e6b3b95 3410 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3411 result = L2CAP_CONF_PENDING;
3412 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3413 }
3414 }
3415
f2fcfcd6
GP		 3416 switch (rfc.mode) {
3417 case L2CAP_MODE_BASIC:
47d1ec61 3418 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3419 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3420 break;
3421
3422 case L2CAP_MODE_ERTM:
6327eb98
AE		 3423 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3424 chan->remote_tx_win = rfc.txwin_size;
3425 else
3426 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3427
2c03a7a4 3428 chan->remote_max_tx = rfc.max_transmit;
1c762159 3429
c8f79162 3430 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3431 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3432 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3433 rfc.max_pdu_size = cpu_to_le16(size);
3434 chan->remote_mps = size;
f2fcfcd6 3435
36c86c85 3436 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3437
c1360a1c 3438 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3439
3440 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3441 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3442
42dceae2
AE		 3443 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3444 chan->remote_id = efs.id;
3445 chan->remote_stype = efs.stype;
3446 chan->remote_msdu = le16_to_cpu(efs.msdu);
3447 chan->remote_flush_to =
2d792818 3448 le32_to_cpu(efs.flush_to);
42dceae2 3449 chan->remote_acc_lat =
2d792818 3450 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3451 chan->remote_sdu_itime =
3452 le32_to_cpu(efs.sdu_itime);
3453 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3454 sizeof(efs),
3455 (unsigned long) &efs);
42dceae2 3456 }
f2fcfcd6
GP		 3457 break;
3458
3459 case L2CAP_MODE_STREAMING:
c8f79162 3460 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3461 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3462 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3463 rfc.max_pdu_size = cpu_to_le16(size);
3464 chan->remote_mps = size;
f2fcfcd6 3465
c1360a1c 3466 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3467
2d792818
GP		 3468 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3469 (unsigned long) &rfc);
68ae6639 3470
f2fcfcd6
GP		 3471 break;
3472
3473 default:
5dee9e7c 3474 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3475
6464f35f 3476 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3477 rfc.mode = chan->mode;
f2fcfcd6 3478 }
6464f35f 3479
f2fcfcd6 3480 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3481 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3482 }
fe4128e0 3483 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3484 rsp->result = cpu_to_le16(result);
59e54bd1 3485 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3486
3487 return ptr - data;
1da177e4
LT		 3488}
3489
2d792818
GP		 3490static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3491 void *data, u16 *result)
f2fcfcd6 3492{
f2fcfcd6
GP		 3493 struct l2cap_conf_req *req = data;
3494 void *ptr = req->data;
3495 int type, olen;
3496 unsigned long val;
36e999a8 3497 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3498 struct l2cap_conf_efs efs;
f2fcfcd6 3499
fe4128e0 3500 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3501
3502 while (len >= L2CAP_CONF_OPT_SIZE) {
3503 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3504
3505 switch (type) {
3506 case L2CAP_CONF_MTU:
3507 if (val < L2CAP_DEFAULT_MIN_MTU) {
3508 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3509 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3510 } else
0c1bc5c6
GP		 3511 chan->imtu = val;
3512 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3513 break;
3514
3515 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3516 chan->flush_to = val;
f2fcfcd6 3517 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3518 2, chan->flush_to);
f2fcfcd6
GP		 3519 break;
3520
3521 case L2CAP_CONF_RFC:
3522 if (olen == sizeof(rfc))
3523 memcpy(&rfc, (void *)val, olen);
3524
c1360a1c 3525 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3526 rfc.mode != chan->mode)
f2fcfcd6
GP		 3527 return -ECONNREFUSED;
3528
47d1ec61 3529 chan->fcs = 0;
f2fcfcd6
GP		 3530
3531 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3532 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3533 break;
6327eb98
AE		 3534
3535 case L2CAP_CONF_EWS:
c20f8e35 3536 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3537 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3538 chan->tx_win);
6327eb98 3539 break;
66af7aaf
AE		 3540
3541 case L2CAP_CONF_EFS:
3542 if (olen == sizeof(efs))
3543 memcpy(&efs, (void *)val, olen);
3544
3545 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3546 efs.stype != L2CAP_SERV_NOTRAFIC &&
3547 efs.stype != chan->local_stype)
66af7aaf
AE		 3548 return -ECONNREFUSED;
3549
2d792818
GP		 3550 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3551 (unsigned long) &efs);
66af7aaf 3552 break;
cbabee78
AE		 3553
3554 case L2CAP_CONF_FCS:
3555 if (*result == L2CAP_CONF_PENDING)
3556 if (val == L2CAP_FCS_NONE)
f2592d3e 3557 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3558 &chan->conf_state);
3559 break;
f2fcfcd6
GP		 3560 }
3561 }
3562
0c1bc5c6 3563 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3564 return -ECONNREFUSED;
3565
0c1bc5c6 3566 chan->mode = rfc.mode;
6c2ea7a8 3567
0e8b207e 3568 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3569 switch (rfc.mode) {
3570 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3571 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3572 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3573 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3574 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3575 chan->ack_win = min_t(u16, chan->ack_win,
3576 rfc.txwin_size);
66af7aaf
AE		 3577
3578 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3579 chan->local_msdu = le16_to_cpu(efs.msdu);
3580 chan->local_sdu_itime =
2d792818 3581 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3582 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3583 chan->local_flush_to =
2d792818 3584 le32_to_cpu(efs.flush_to);
66af7aaf 3585 }
f2fcfcd6 3586 break;
66af7aaf 3587
f2fcfcd6 3588 case L2CAP_MODE_STREAMING:
47d1ec61 3589 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3590 }
3591 }
3592
fe4128e0 3593 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3594 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3595
3596 return ptr - data;
3597}
3598
2d792818
GP		 3599static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3600 u16 result, u16 flags)
1da177e4
LT		 3601{
3602 struct l2cap_conf_rsp *rsp = data;
3603 void *ptr = rsp->data;
1da177e4 3604
fe4128e0 3605 BT_DBG("chan %p", chan);
1da177e4 3606
fe4128e0 3607 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3608 rsp->result = cpu_to_le16(result);
aca3192c 3609 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3610
3611 return ptr - data;
3612}
3613
8c1d787b 3614void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3615{
3616 struct l2cap_conn_rsp rsp;
8c1d787b 3617 struct l2cap_conn *conn = chan->conn;
710f9b0a 3618 u8 buf[128];
439f34ac 3619 u8 rsp_code;
710f9b0a 3620
fe4128e0
GP		 3621 rsp.scid = cpu_to_le16(chan->dcid);
3622 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3623 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3624 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3625
3626 if (chan->hs_hcon)
3627 rsp_code = L2CAP_CREATE_CHAN_RSP;
3628 else
3629 rsp_code = L2CAP_CONN_RSP;
3630
3631 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3632
3633 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3634
c1360a1c 3635 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3636 return;
3637
710f9b0a 3638 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3639 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3640 chan->num_conf_req++;
3641}
3642
47d1ec61 3643static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3644{
7b1c0049
GP		 3645 int type, olen;
3646 unsigned long val;
c20f8e35
MM		 3647 /* Use sane default values in case a misbehaving remote device
3648 * did not send an RFC or extended window size option.
3649 */
3650 u16 txwin_ext = chan->ack_win;
3651 struct l2cap_conf_rfc rfc = {
3652 .mode = chan->mode,
3653 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3654 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3655 .max_pdu_size = cpu_to_le16(chan->imtu),
3656 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3657 };
7b1c0049 3658
47d1ec61 3659 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3660
0c1bc5c6 3661 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3662 return;
3663
3664 while (len >= L2CAP_CONF_OPT_SIZE) {
3665 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3666
c20f8e35
MM		 3667 switch (type) {
3668 case L2CAP_CONF_RFC:
3669 if (olen == sizeof(rfc))
3670 memcpy(&rfc, (void *)val, olen);
8f321f85 3671 break;
c20f8e35
MM		 3672 case L2CAP_CONF_EWS:
3673 txwin_ext = val;
3674 break;
3675 }
7b1c0049
GP		 3676 }
3677
7b1c0049
GP		 3678 switch (rfc.mode) {
3679 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3680 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3681 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3682 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3683 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3684 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3685 else
3686 chan->ack_win = min_t(u16, chan->ack_win,
3687 rfc.txwin_size);
7b1c0049
GP		 3688 break;
3689 case L2CAP_MODE_STREAMING:
47d1ec61 3690 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3691 }
3692}
3693
2d792818 3694static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3695 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3696 u8 *data)
4e8402a3 3697{
e2fd318e 3698 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3699
cb3b3152
JH		 3700 if (cmd_len < sizeof(*rej))
3701 return -EPROTO;
3702
e2fd318e 3703 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3704 return 0;
3705
3706 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3707 cmd->ident == conn->info_ident) {
17cd3f37 3708 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3709
3710 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3711 conn->info_ident = 0;
984947dc 3712
4e8402a3
MH		 3713 l2cap_conn_start(conn);
3714 }
3715
3716 return 0;
3717}
3718
1700915f
MM		 3719static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3720 struct l2cap_cmd_hdr *cmd,
3721 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3722{
1da177e4
LT		 3723 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3724 struct l2cap_conn_rsp rsp;
23691d75 3725 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 3726 struct sock *parent, *sk = NULL;
e7c29cb1 3727 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3728
3729 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3730 __le16 psm = req->psm;
1da177e4 3731
097db76c 3732 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3733
3734 /* Check if we have socket listening on psm */
6f59b904 3735 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
98e0f7ea 3736 &conn->hcon->dst);
23691d75 3737 if (!pchan) {
1da177e4
LT		 3738 result = L2CAP_CR_BAD_PSM;
3739 goto sendresp;
3740 }
3741
23691d75
GP		 3742 parent = pchan->sk;
3743
3df91ea2 3744 mutex_lock(&conn->chan_lock);
aa2ac881 3745 lock_sock(parent);
e0f0cb56 3746
e7c29cb1 3747 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3748 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3749 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3750 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3751 result = L2CAP_CR_SEC_BLOCK;
3752 goto response;
3753 }
3754
1da177e4
LT		 3755 result = L2CAP_CR_NO_MEM;
3756
2dfa1003
GP		 3757 /* Check if we already have channel with that dcid */
3758 if (__l2cap_get_chan_by_dcid(conn, scid))
3759 goto response;
3760
80b98027 3761 chan = pchan->ops->new_connection(pchan);
80808e43 3762 if (!chan)
1da177e4
LT		 3763 goto response;
3764
80808e43
GP		 3765 sk = chan->sk;
3766
330b6c15
SS		 3767 /* For certain devices (ex: HID mouse), support for authentication,
3768 * pairing and bonding is optional. For such devices, inorder to avoid
3769 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3770 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3771 */
3772 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3773
7eafc59e
MH		 3774 bacpy(&chan->src, &conn->hcon->src);
3775 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 3776 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3777 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
fe4128e0
GP		 3778 chan->psm = psm;
3779 chan->dcid = scid;
1700915f 3780 chan->local_amp_id = amp_id;
1da177e4 3781
6be36555 3782 __l2cap_chan_add(conn, chan);
48454079 3783
fe4128e0 3784 dcid = chan->scid;
1da177e4 3785
8d836d71 3786 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3787
fc7f8a7e 3788 chan->ident = cmd->ident;
1da177e4 3789
984947dc 3790 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3791 if (l2cap_chan_check_security(chan)) {
bdc25783 3792 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
0e587be7 3793 __l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3794 result = L2CAP_CR_PEND;
3795 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3796 chan->ops->defer(chan);
f66dc81f 3797 } else {
1700915f
MM		 3798 /* Force pending result for AMP controllers.
3799 * The connection will succeed after the
3800 * physical link is up.
3801 */
6ed971ca 3802 if (amp_id == AMP_ID_BREDR) {
1700915f
MM		 3803 __l2cap_state_change(chan, BT_CONFIG);
3804 result = L2CAP_CR_SUCCESS;
6ed971ca
MH		 3805 } else {
3806 __l2cap_state_change(chan, BT_CONNECT2);
3807 result = L2CAP_CR_PEND;
1700915f 3808 }
f66dc81f
MH		 3809 status = L2CAP_CS_NO_INFO;
3810 }
79d554a6 3811 } else {
0e587be7 3812 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3813 result = L2CAP_CR_PEND;
3814 status = L2CAP_CS_AUTHEN_PEND;
3815 }
3816 } else {
0e587be7 3817 __l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3818 result = L2CAP_CR_PEND;
3819 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3820 }
3821
1da177e4 3822response:
aa2ac881 3823 release_sock(parent);
3df91ea2 3824 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3825
3826sendresp:
aca3192c
YH		 3827 rsp.scid = cpu_to_le16(scid);
3828 rsp.dcid = cpu_to_le16(dcid);
3829 rsp.result = cpu_to_le16(result);
3830 rsp.status = cpu_to_le16(status);
4c89b6aa 3831 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3832
3833 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3834 struct l2cap_info_req info;
ac73498c 3835 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3836
3837 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3838 conn->info_ident = l2cap_get_ident(conn);
3839
ba13ccd9 3840 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3841
2d792818
GP		 3842 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3843 sizeof(info), &info);
79d554a6
MH		 3844 }
3845
c1360a1c 3846 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3847 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3848 u8 buf[128];
c1360a1c 3849 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3850 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3851 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3852 chan->num_conf_req++;
e9aeb2dd 3853 }
1700915f
MM		 3854
3855 return chan;
4c89b6aa 3856}
e9aeb2dd 3857
4c89b6aa 3858static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3859 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3860{
7b064eda
JK		 3861 struct hci_dev *hdev = conn->hcon->hdev;
3862 struct hci_conn *hcon = conn->hcon;
3863
cb3b3152
JH		 3864 if (cmd_len < sizeof(struct l2cap_conn_req))
3865 return -EPROTO;
3866
7b064eda
JK		 3867 hci_dev_lock(hdev);
3868 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3869 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3870 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3871 hcon->dst_type, 0, NULL, 0,
3872 hcon->dev_class);
3873 hci_dev_unlock(hdev);
3874
300229f9 3875 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3876 return 0;
3877}
3878
5909cf30 3879static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3880 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3881 u8 *data)
1da177e4
LT		 3882{
3883 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3884 u16 scid, dcid, result, status;
48454079 3885 struct l2cap_chan *chan;
1da177e4 3886 u8 req[128];
3df91ea2 3887 int err;
1da177e4 3888
cb3b3152
JH		 3889 if (cmd_len < sizeof(*rsp))
3890 return -EPROTO;
3891
1da177e4
LT		 3892 scid = __le16_to_cpu(rsp->scid);
3893 dcid = __le16_to_cpu(rsp->dcid);
3894 result = __le16_to_cpu(rsp->result);
3895 status = __le16_to_cpu(rsp->status);
3896
1b009c98 3897 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3898 dcid, scid, result, status);
1da177e4 3899
3df91ea2
AE		 3900 mutex_lock(&conn->chan_lock);
3901
1da177e4 3902 if (scid) {
3df91ea2
AE		 3903 chan = __l2cap_get_chan_by_scid(conn, scid);
3904 if (!chan) {
21870b52 3905 err = -EBADSLT;
3df91ea2
AE		 3906 goto unlock;
3907 }
1da177e4 3908 } else {
3df91ea2
AE		 3909 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3910 if (!chan) {
21870b52 3911 err = -EBADSLT;
3df91ea2
AE		 3912 goto unlock;
3913 }
1da177e4
LT		 3914 }
3915
3df91ea2
AE		 3916 err = 0;
3917
6be36555 3918 l2cap_chan_lock(chan);
48454079 3919
1da177e4
LT		 3920 switch (result) {
3921 case L2CAP_CR_SUCCESS:
89bc500e 3922 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3923 chan->ident = 0;
fe4128e0 3924 chan->dcid = dcid;
c1360a1c 3925 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3926
c1360a1c 3927 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3928 break;
3929
1da177e4 3930 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3931 l2cap_build_conf_req(chan, req), req);
73ffa904 3932 chan->num_conf_req++;
1da177e4
LT		 3933 break;
3934
3935 case L2CAP_CR_PEND:
c1360a1c 3936 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3937 break;
3938
3939 default:
48454079 3940 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3941 break;
3942 }
3943
6be36555 3944 l2cap_chan_unlock(chan);
3df91ea2
AE		 3945
3946unlock:
3947 mutex_unlock(&conn->chan_lock);
3948
3949 return err;
1da177e4
LT		 3950}
3951
47d1ec61 3952static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3953{
3954 /* FCS is enabled only in ERTM or streaming mode, if one or both
3955 * sides request it.
3956 */
0c1bc5c6 3957 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3958 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3959 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3960 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3961}
3962
29d8a590
AE		 3963static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3964 u8 ident, u16 flags)
3965{
3966 struct l2cap_conn *conn = chan->conn;
3967
3968 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3969 flags);
3970
3971 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3972 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3973
3974 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3975 l2cap_build_conf_rsp(chan, data,
3976 L2CAP_CONF_SUCCESS, flags), data);
3977}
3978
2d792818
GP		 3979static inline int l2cap_config_req(struct l2cap_conn *conn,
3980 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3981 u8 *data)
1da177e4
LT		 3982{
3983 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3984 u16 dcid, flags;
3985 u8 rsp[64];
48454079 3986 struct l2cap_chan *chan;
3c588192 3987 int len, err = 0;
1da177e4 3988
cb3b3152
JH		 3989 if (cmd_len < sizeof(*req))
3990 return -EPROTO;
3991
1da177e4
LT		 3992 dcid = __le16_to_cpu(req->dcid);
3993 flags = __le16_to_cpu(req->flags);
3994
3995 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3996
baa7e1fa 3997 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3998 if (!chan)
21870b52 3999 return -EBADSLT;
1da177e4 4000
033b1142 4001 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 4002 struct l2cap_cmd_rej_cid rej;
4003
ac73498c 4004 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
e2fd318e
IK		 4005 rej.scid = cpu_to_le16(chan->scid);
4006 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 4007
df6bd743 4008 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2d792818 4009 sizeof(rej), &rej);
354f60a9 4010 goto unlock;
df6bd743 4011 }
354f60a9 4012
5dee9e7c 4013 /* Reject if config buffer is too small. */
88219a0f 4014 len = cmd_len - sizeof(*req);
cb3b3152 4015 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4016 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4017 l2cap_build_conf_rsp(chan, rsp,
4018 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4019 goto unlock;
4020 }
4021
4022 /* Store config. */
73ffa904
GP		 4023 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4024 chan->conf_len += len;
1da177e4 4025
59e54bd1 4026 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4027 /* Incomplete config. Send empty response. */
4028 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4029 l2cap_build_conf_rsp(chan, rsp,
4030 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4031 goto unlock;
4032 }
4033
4034 /* Complete config. */
73ffa904 4035 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4036 if (len < 0) {
5e4e3972 4037 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4038 goto unlock;
f2fcfcd6 4039 }
1da177e4 4040
1500109b 4041 chan->ident = cmd->ident;
5dee9e7c 4042 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4043 chan->num_conf_rsp++;
5dee9e7c 4044
5dee9e7c 4045 /* Reset config buffer. */
73ffa904 4046 chan->conf_len = 0;
5dee9e7c 4047
c1360a1c 4048 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4049 goto unlock;
4050
c1360a1c 4051 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4052 set_default_fcs(chan);
fcc203c3 4053
105bdf9e
MM		 4054 if (chan->mode == L2CAP_MODE_ERTM ||
4055 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4056 err = l2cap_ertm_init(chan);
4057
4058 if (err < 0)
5e4e3972 4059 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4060 else
4061 l2cap_chan_ready(chan);
0565c1c2 4062
876d9484
MH		 4063 goto unlock;
4064 }
4065
c1360a1c 4066 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4067 u8 buf[64];
1da177e4 4068 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4069 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4070 chan->num_conf_req++;
1da177e4
LT		 4071 }
4072
0e8b207e
AE		 4073 /* Got Conf Rsp PENDING from remote side and asume we sent
4074 Conf Rsp PENDING in the code above */
4075 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4076 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4077
4078 /* check compatibility */
4079
79de886d 4080 /* Send rsp for BR/EDR channel */
f351bc72 4081 if (!chan->hs_hcon)
79de886d
AE		 4082 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4083 else
4084 chan->ident = cmd->ident;
0e8b207e
AE		 4085 }
4086
1da177e4 4087unlock:
6be36555 4088 l2cap_chan_unlock(chan);
3c588192 4089 return err;
1da177e4
LT		 4090}
4091
2d792818 4092static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4093 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4094 u8 *data)
1da177e4
LT		 4095{
4096 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4097 u16 scid, flags, result;
48454079 4098 struct l2cap_chan *chan;
cb3b3152 4099 int len = cmd_len - sizeof(*rsp);
3c588192 4100 int err = 0;
1da177e4 4101
cb3b3152
JH		 4102 if (cmd_len < sizeof(*rsp))
4103 return -EPROTO;
4104
1da177e4
LT		 4105 scid = __le16_to_cpu(rsp->scid);
4106 flags = __le16_to_cpu(rsp->flags);
4107 result = __le16_to_cpu(rsp->result);
4108
61386cba
AE		 4109 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4110 result, len);
1da177e4 4111
baa7e1fa 4112 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4113 if (!chan)
1da177e4
LT		 4114 return 0;
4115
4116 switch (result) {
4117 case L2CAP_CONF_SUCCESS:
47d1ec61 4118 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4119 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4120 break;
4121
0e8b207e
AE		 4122 case L2CAP_CONF_PENDING:
4123 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4124
4125 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4126 char buf[64];
4127
4128 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4129 buf, &result);
0e8b207e 4130 if (len < 0) {
5e4e3972 4131 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4132 goto done;
4133 }
4134
f351bc72 4135 if (!chan->hs_hcon) {
79de886d
AE		 4136 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4137 0);
5ce66b59
AE		 4138 } else {
4139 if (l2cap_check_efs(chan)) {
4140 amp_create_logical_link(chan);
4141 chan->ident = cmd->ident;
4142 }
4143 }
0e8b207e
AE		 4144 }
4145 goto done;
4146
1da177e4 4147 case L2CAP_CONF_UNACCEPT:
73ffa904 4148 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4149 char req[64];
4150
c2c77ec8 4151 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4152 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4153 goto done;
4154 }
4155
f2fcfcd6
GP		 4156 /* throw out any old stored conf requests */
4157 result = L2CAP_CONF_SUCCESS;
b4450035 4158 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4159 req, &result);
f2fcfcd6 4160 if (len < 0) {
5e4e3972 4161 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4162 goto done;
4163 }
4164
4165 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4166 L2CAP_CONF_REQ, len, req);
73ffa904 4167 chan->num_conf_req++;
f2fcfcd6
GP		 4168 if (result != L2CAP_CONF_SUCCESS)
4169 goto done;
4170 break;
1da177e4
LT		 4171 }
4172
8e87d142 4173 default:
6be36555 4174 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4175
ba13ccd9 4176 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4177 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4178 goto done;
4179 }
4180
59e54bd1 4181 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4182 goto done;
4183
c1360a1c 4184 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4185
c1360a1c 4186 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4187 set_default_fcs(chan);
fcc203c3 4188
105bdf9e
MM		 4189 if (chan->mode == L2CAP_MODE_ERTM ||
4190 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4191 err = l2cap_ertm_init(chan);
0565c1c2 4192
3c588192 4193 if (err < 0)
5e4e3972 4194 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4195 else
4196 l2cap_chan_ready(chan);
1da177e4
LT		 4197 }
4198
4199done:
6be36555 4200 l2cap_chan_unlock(chan);
3c588192 4201 return err;
1da177e4
LT		 4202}
4203
2d792818 4204static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4205 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4206 u8 *data)
1da177e4
LT		 4207{
4208 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4209 struct l2cap_disconn_rsp rsp;
4210 u16 dcid, scid;
48454079 4211 struct l2cap_chan *chan;
1da177e4 4212
cb3b3152
JH		 4213 if (cmd_len != sizeof(*req))
4214 return -EPROTO;
4215
1da177e4
LT		 4216 scid = __le16_to_cpu(req->scid);
4217 dcid = __le16_to_cpu(req->dcid);
4218
4219 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4220
3df91ea2
AE		 4221 mutex_lock(&conn->chan_lock);
4222
4223 chan = __l2cap_get_chan_by_scid(conn, dcid);
4224 if (!chan) {
4225 mutex_unlock(&conn->chan_lock);
c4ea249f 4226 return -EBADSLT;
3df91ea2 4227 }
1da177e4 4228
6be36555
AE		 4229 l2cap_chan_lock(chan);
4230
fe4128e0
GP		 4231 rsp.dcid = cpu_to_le16(chan->scid);
4232 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4233 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4234
5ec1bbe5 4235 chan->ops->set_shutdown(chan);
1da177e4 4236
61d6ef3e 4237 l2cap_chan_hold(chan);
48454079 4238 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4239
4240 l2cap_chan_unlock(chan);
1da177e4 4241
80b98027 4242 chan->ops->close(chan);
61d6ef3e 4243 l2cap_chan_put(chan);
3df91ea2
AE		 4244
4245 mutex_unlock(&conn->chan_lock);
4246
1da177e4
LT		 4247 return 0;
4248}
4249
2d792818 4250static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4251 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4252 u8 *data)
1da177e4
LT		 4253{
4254 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4255 u16 dcid, scid;
48454079 4256 struct l2cap_chan *chan;
1da177e4 4257
cb3b3152
JH		 4258 if (cmd_len != sizeof(*rsp))
4259 return -EPROTO;
4260
1da177e4
LT		 4261 scid = __le16_to_cpu(rsp->scid);
4262 dcid = __le16_to_cpu(rsp->dcid);
4263
4264 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4265
3df91ea2
AE		 4266 mutex_lock(&conn->chan_lock);
4267
4268 chan = __l2cap_get_chan_by_scid(conn, scid);
4269 if (!chan) {
4270 mutex_unlock(&conn->chan_lock);
1da177e4 4271 return 0;
3df91ea2 4272 }
1da177e4 4273
6be36555 4274 l2cap_chan_lock(chan);
48454079 4275
61d6ef3e 4276 l2cap_chan_hold(chan);
48454079 4277 l2cap_chan_del(chan, 0);
6be36555
AE		 4278
4279 l2cap_chan_unlock(chan);
1da177e4 4280
80b98027 4281 chan->ops->close(chan);
61d6ef3e 4282 l2cap_chan_put(chan);
3df91ea2
AE		 4283
4284 mutex_unlock(&conn->chan_lock);
4285
1da177e4
LT		 4286 return 0;
4287}
4288
2d792818 4289static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4290 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4291 u8 *data)
1da177e4
LT		 4292{
4293 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4294 u16 type;
4295
cb3b3152
JH		 4296 if (cmd_len != sizeof(*req))
4297 return -EPROTO;
4298
1da177e4
LT		 4299 type = __le16_to_cpu(req->type);
4300
4301 BT_DBG("type 0x%4.4x", type);
4302
f0709e03
MH		 4303 if (type == L2CAP_IT_FEAT_MASK) {
4304 u8 buf[8];
44dd46de 4305 u32 feat_mask = l2cap_feat_mask;
f0709e03 4306 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4307 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4308 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4309 if (!disable_ertm)
fcc203c3 4310 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4311 | L2CAP_FEAT_FCS;
848566b3 4312 if (conn->hs_enabled)
6327eb98 4313 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4314 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4315
1b7bf4ed 4316 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4317 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4318 buf);
e1027a7c
MH		 4319 } else if (type == L2CAP_IT_FIXED_CHAN) {
4320 u8 buf[12];
4321 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4322
848566b3 4323 if (conn->hs_enabled)
50a147cd
MM		 4324 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4325 else
4326 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4327
ac73498c
AE		 4328 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4329 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4330 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4331 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4332 buf);
f0709e03
MH		 4333 } else {
4334 struct l2cap_info_rsp rsp;
4335 rsp.type = cpu_to_le16(type);
ac73498c 4336 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4337 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4338 &rsp);
f0709e03 4339 }
1da177e4
LT		 4340
4341 return 0;
4342}
4343
2d792818 4344static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4345 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4346 u8 *data)
1da177e4
LT		 4347{
4348 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4349 u16 type, result;
4350
3f6fa3d4 4351 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4352 return -EPROTO;
4353
1da177e4
LT		 4354 type = __le16_to_cpu(rsp->type);
4355 result = __le16_to_cpu(rsp->result);
4356
4357 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4358
e90165be
AE		 4359 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4360 if (cmd->ident != conn->info_ident ||
2d792818 4361 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4362 return 0;
4363
17cd3f37 4364 cancel_delayed_work(&conn->info_timer);
4e8402a3 4365
adb08ede
VT		 4366 if (result != L2CAP_IR_SUCCESS) {
4367 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4368 conn->info_ident = 0;
4369
4370 l2cap_conn_start(conn);
4371
4372 return 0;
4373 }
4374
978c93b9
AE		 4375 switch (type) {
4376 case L2CAP_IT_FEAT_MASK:
83985319 4377 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4378
47ec1dcd 4379 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4380 struct l2cap_info_req req;
ac73498c 4381 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4382
4383 conn->info_ident = l2cap_get_ident(conn);
4384
4385 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4386 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4387 } else {
4388 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4389 conn->info_ident = 0;
4390
4391 l2cap_conn_start(conn);
4392 }
978c93b9
AE		 4393 break;
4394
4395 case L2CAP_IT_FIXED_CHAN:
4396 conn->fixed_chan_mask = rsp->data[0];
984947dc 4397 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4398 conn->info_ident = 0;
984947dc
MH		 4399
4400 l2cap_conn_start(conn);
978c93b9 4401 break;
984947dc 4402 }
4e8402a3 4403
1da177e4
LT		 4404 return 0;
4405}
4406
1700915f
MM		 4407static int l2cap_create_channel_req(struct l2cap_conn *conn,
4408 struct l2cap_cmd_hdr *cmd,
4409 u16 cmd_len, void *data)
f94ff6ff
MM		 4410{
4411 struct l2cap_create_chan_req *req = data;
6e1df6a6 4412 struct l2cap_create_chan_rsp rsp;
1700915f 4413 struct l2cap_chan *chan;
6e1df6a6 4414 struct hci_dev *hdev;
f94ff6ff
MM		 4415 u16 psm, scid;
4416
4417 if (cmd_len != sizeof(*req))
4418 return -EPROTO;
4419
848566b3 4420 if (!conn->hs_enabled)
f94ff6ff
MM		 4421 return -EINVAL;
4422
4423 psm = le16_to_cpu(req->psm);
4424 scid = le16_to_cpu(req->scid);
4425
ad0ac6ca 4426 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4427
6e1df6a6 4428 /* For controller id 0 make BR/EDR connection */
6ed971ca 4429 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4430 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4431 req->amp_id);
4432 return 0;
4433 }
1700915f 4434
6e1df6a6
AE		 4435 /* Validate AMP controller id */
4436 hdev = hci_dev_get(req->amp_id);
4437 if (!hdev)
4438 goto error;
1700915f 4439
6e1df6a6
AE		 4440 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4441 hci_dev_put(hdev);
4442 goto error;
4443 }
1700915f 4444
6e1df6a6
AE		 4445 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4446 req->amp_id);
4447 if (chan) {
4448 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4449 struct hci_conn *hs_hcon;
1700915f 4450
98e0f7ea
MH		 4451 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4452 &conn->hcon->dst);
6e1df6a6
AE		 4453 if (!hs_hcon) {
4454 hci_dev_put(hdev);
21870b52 4455 return -EBADSLT;
1700915f
MM		 4456 }
4457
6e1df6a6
AE		 4458 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4459
6e1df6a6
AE		 4460 mgr->bredr_chan = chan;
4461 chan->hs_hcon = hs_hcon;
fd45bf4c 4462 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4463 conn->mtu = hdev->block_mtu;
1700915f 4464 }
f94ff6ff 4465
6e1df6a6 4466 hci_dev_put(hdev);
f94ff6ff
MM		 4467
4468 return 0;
6e1df6a6
AE		 4469
4470error:
4471 rsp.dcid = 0;
4472 rsp.scid = cpu_to_le16(scid);
4473 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4474 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4475
4476 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4477 sizeof(rsp), &rsp);
4478
dc280801 4479 return 0;
f94ff6ff
MM		 4480}
4481
8eb200bd
MM		 4482static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4483{
4484 struct l2cap_move_chan_req req;
4485 u8 ident;
4486
4487 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4488
4489 ident = l2cap_get_ident(chan->conn);
4490 chan->ident = ident;
4491
4492 req.icid = cpu_to_le16(chan->scid);
4493 req.dest_amp_id = dest_amp_id;
4494
4495 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4496 &req);
4497
4498 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4499}
4500
1500109b 4501static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4502{
4503 struct l2cap_move_chan_rsp rsp;
4504
1500109b 4505 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4506
1500109b 4507 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4508 rsp.result = cpu_to_le16(result);
4509
1500109b
MM		 4510 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4511 sizeof(rsp), &rsp);
8d5a04a1
MM		 4512}
4513
5b155ef9 4514static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4515{
4516 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4517
5b155ef9 4518 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4519
5b155ef9 4520 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4521
5b155ef9 4522 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4523 cfm.result = cpu_to_le16(result);
4524
5b155ef9
MM		 4525 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4526 sizeof(cfm), &cfm);
4527
4528 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4529}
4530
4531static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4532{
4533 struct l2cap_move_chan_cfm cfm;
4534
4535 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4536
4537 cfm.icid = cpu_to_le16(icid);
4538 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4539
4540 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4541 sizeof(cfm), &cfm);
8d5a04a1
MM		 4542}
4543
4544static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4545 u16 icid)
8d5a04a1
MM		 4546{
4547 struct l2cap_move_chan_cfm_rsp rsp;
4548
ad0ac6ca 4549 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4550
4551 rsp.icid = cpu_to_le16(icid);
4552 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4553}
4554
5f3847a4
MM		 4555static void __release_logical_link(struct l2cap_chan *chan)
4556{
4557 chan->hs_hchan = NULL;
4558 chan->hs_hcon = NULL;
4559
4560 /* Placeholder - release the logical link */
4561}
4562
1500109b
MM		 4563static void l2cap_logical_fail(struct l2cap_chan *chan)
4564{
4565 /* Logical link setup failed */
4566 if (chan->state != BT_CONNECTED) {
4567 /* Create channel failure, disconnect */
5e4e3972 4568 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4569 return;
4570 }
4571
4572 switch (chan->move_role) {
4573 case L2CAP_MOVE_ROLE_RESPONDER:
4574 l2cap_move_done(chan);
4575 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4576 break;
4577 case L2CAP_MOVE_ROLE_INITIATOR:
4578 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4579 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4580 /* Remote has only sent pending or
4581 * success responses, clean up
4582 */
4583 l2cap_move_done(chan);
4584 }
4585
4586 /* Other amp move states imply that the move
4587 * has already aborted
4588 */
4589 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4590 break;
4591 }
4592}
4593
4594static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4595 struct hci_chan *hchan)
4596{
4597 struct l2cap_conf_rsp rsp;
1500109b 4598
336178a3 4599 chan->hs_hchan = hchan;
1500109b
MM		 4600 chan->hs_hcon->l2cap_data = chan->conn;
4601
35ba9561 4602 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4603
4604 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4605 int err;
1500109b
MM		 4606
4607 set_default_fcs(chan);
4608
4609 err = l2cap_ertm_init(chan);
4610 if (err < 0)
5e4e3972 4611 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4612 else
4613 l2cap_chan_ready(chan);
4614 }
4615}
4616
4617static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4618 struct hci_chan *hchan)
4619{
4620 chan->hs_hcon = hchan->conn;
4621 chan->hs_hcon->l2cap_data = chan->conn;
4622
4623 BT_DBG("move_state %d", chan->move_state);
4624
4625 switch (chan->move_state) {
4626 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4627 /* Move confirm will be sent after a success
4628 * response is received
4629 */
4630 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4631 break;
4632 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4633 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4634 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4635 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4636 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4637 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4638 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4639 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4640 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4641 }
4642 break;
4643 default:
4644 /* Move was not in expected state, free the channel */
4645 __release_logical_link(chan);
4646
4647 chan->move_state = L2CAP_MOVE_STABLE;
4648 }
4649}
4650
4651/* Call with chan locked */
27695fb4
AE		 4652void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4653 u8 status)
5b155ef9 4654{
1500109b
MM		 4655 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4656
4657 if (status) {
4658 l2cap_logical_fail(chan);
4659 __release_logical_link(chan);
4660 return;
4661 }
4662
4663 if (chan->state != BT_CONNECTED) {
4664 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4665 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4666 l2cap_logical_finish_create(chan, hchan);
4667 } else {
4668 l2cap_logical_finish_move(chan, hchan);
4669 }
5b155ef9
MM		 4670}
4671
3f7a56c4
MM		 4672void l2cap_move_start(struct l2cap_chan *chan)
4673{
4674 BT_DBG("chan %p", chan);
4675
6ed971ca 4676 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4677 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4678 return;
4679 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4680 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4681 /* Placeholder - start physical link setup */
4682 } else {
4683 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4684 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4685 chan->move_id = 0;
4686 l2cap_move_setup(chan);
4687 l2cap_send_move_chan_req(chan, 0);
4688 }
4689}
4690
8eb200bd
MM		 4691static void l2cap_do_create(struct l2cap_chan *chan, int result,
4692 u8 local_amp_id, u8 remote_amp_id)
4693{
62748ca1
AE		 4694 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4695 local_amp_id, remote_amp_id);
4696
12d6cc60
AE		 4697 chan->fcs = L2CAP_FCS_NONE;
4698
62748ca1
AE		 4699 /* Outgoing channel on AMP */
4700 if (chan->state == BT_CONNECT) {
4701 if (result == L2CAP_CR_SUCCESS) {
4702 chan->local_amp_id = local_amp_id;
4703 l2cap_send_create_chan_req(chan, remote_amp_id);
4704 } else {
4705 /* Revert to BR/EDR connect */
4706 l2cap_send_conn_req(chan);
4707 }
4708
4709 return;
4710 }
4711
4712 /* Incoming channel on AMP */
4713 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4714 struct l2cap_conn_rsp rsp;
4715 char buf[128];
4716 rsp.scid = cpu_to_le16(chan->dcid);
4717 rsp.dcid = cpu_to_le16(chan->scid);
4718
8eb200bd
MM		 4719 if (result == L2CAP_CR_SUCCESS) {
4720 /* Send successful response */
62cd50e2
AE		 4721 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4722 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4723 } else {
4724 /* Send negative response */
62cd50e2
AE		 4725 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4726 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4727 }
4728
4729 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4730 sizeof(rsp), &rsp);
4731
4732 if (result == L2CAP_CR_SUCCESS) {
4733 __l2cap_state_change(chan, BT_CONFIG);
4734 set_bit(CONF_REQ_SENT, &chan->conf_state);
4735 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4736 L2CAP_CONF_REQ,
4737 l2cap_build_conf_req(chan, buf), buf);
4738 chan->num_conf_req++;
4739 }
8eb200bd
MM		 4740 }
4741}
4742
4743static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4744 u8 remote_amp_id)
4745{
4746 l2cap_move_setup(chan);
4747 chan->move_id = local_amp_id;
4748 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4749
4750 l2cap_send_move_chan_req(chan, remote_amp_id);
4751}
4752
4753static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4754{
4755 struct hci_chan *hchan = NULL;
4756
4757 /* Placeholder - get hci_chan for logical link */
4758
4759 if (hchan) {
4760 if (hchan->state == BT_CONNECTED) {
4761 /* Logical link is ready to go */
4762 chan->hs_hcon = hchan->conn;
4763 chan->hs_hcon->l2cap_data = chan->conn;
4764 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4765 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4766
4767 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4768 } else {
4769 /* Wait for logical link to be ready */
4770 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4771 }
4772 } else {
4773 /* Logical link not available */
4774 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4775 }
4776}
4777
4778static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4779{
4780 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4781 u8 rsp_result;
4782 if (result == -EINVAL)
4783 rsp_result = L2CAP_MR_BAD_ID;
4784 else
4785 rsp_result = L2CAP_MR_NOT_ALLOWED;
4786
4787 l2cap_send_move_chan_rsp(chan, rsp_result);
4788 }
4789
4790 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4791 chan->move_state = L2CAP_MOVE_STABLE;
4792
4793 /* Restart data transmission */
4794 l2cap_ertm_send(chan);
4795}
4796
a514b17f
AE		 4797/* Invoke with locked chan */
4798void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4799{
770bfefa 4800 u8 local_amp_id = chan->local_amp_id;
fffadc08 4801 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4802
8eb200bd
MM		 4803 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4804 chan, result, local_amp_id, remote_amp_id);
4805
8eb200bd
MM		 4806 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4807 l2cap_chan_unlock(chan);
4808 return;
4809 }
4810
4811 if (chan->state != BT_CONNECTED) {
4812 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4813 } else if (result != L2CAP_MR_SUCCESS) {
4814 l2cap_do_move_cancel(chan, result);
4815 } else {
4816 switch (chan->move_role) {
4817 case L2CAP_MOVE_ROLE_INITIATOR:
4818 l2cap_do_move_initiate(chan, local_amp_id,
4819 remote_amp_id);
4820 break;
4821 case L2CAP_MOVE_ROLE_RESPONDER:
4822 l2cap_do_move_respond(chan, result);
4823 break;
4824 default:
4825 l2cap_do_move_cancel(chan, result);
4826 break;
4827 }
4828 }
8eb200bd
MM		 4829}
4830
8d5a04a1 4831static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4832 struct l2cap_cmd_hdr *cmd,
4833 u16 cmd_len, void *data)
8d5a04a1
MM		 4834{
4835 struct l2cap_move_chan_req *req = data;
1500109b 4836 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4837 struct l2cap_chan *chan;
8d5a04a1
MM		 4838 u16 icid = 0;
4839 u16 result = L2CAP_MR_NOT_ALLOWED;
4840
4841 if (cmd_len != sizeof(*req))
4842 return -EPROTO;
4843
4844 icid = le16_to_cpu(req->icid);
4845
ad0ac6ca 4846 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4847
848566b3 4848 if (!conn->hs_enabled)
8d5a04a1
MM		 4849 return -EINVAL;
4850
02b0fbb9
MM		 4851 chan = l2cap_get_chan_by_dcid(conn, icid);
4852 if (!chan) {
1500109b
MM		 4853 rsp.icid = cpu_to_le16(icid);
4854 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4855 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4856 sizeof(rsp), &rsp);
02b0fbb9
MM		 4857 return 0;
4858 }
4859
1500109b
MM		 4860 chan->ident = cmd->ident;
4861
02b0fbb9
MM		 4862 if (chan->scid < L2CAP_CID_DYN_START ||
4863 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4864 (chan->mode != L2CAP_MODE_ERTM &&
4865 chan->mode != L2CAP_MODE_STREAMING)) {
4866 result = L2CAP_MR_NOT_ALLOWED;
4867 goto send_move_response;
4868 }
4869
4870 if (chan->local_amp_id == req->dest_amp_id) {
4871 result = L2CAP_MR_SAME_ID;
4872 goto send_move_response;
4873 }
4874
6ed971ca 4875 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4876 struct hci_dev *hdev;
4877 hdev = hci_dev_get(req->dest_amp_id);
4878 if (!hdev || hdev->dev_type != HCI_AMP ||
4879 !test_bit(HCI_UP, &hdev->flags)) {
4880 if (hdev)
4881 hci_dev_put(hdev);
4882
4883 result = L2CAP_MR_BAD_ID;
4884 goto send_move_response;
4885 }
4886 hci_dev_put(hdev);
4887 }
4888
4889 /* Detect a move collision. Only send a collision response
4890 * if this side has "lost", otherwise proceed with the move.
4891 * The winner has the larger bd_addr.
4892 */
4893 if ((__chan_is_moving(chan) ||
4894 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4895 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4896 result = L2CAP_MR_COLLISION;
4897 goto send_move_response;
4898 }
4899
02b0fbb9
MM		 4900 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4901 l2cap_move_setup(chan);
4902 chan->move_id = req->dest_amp_id;
4903 icid = chan->dcid;
4904
6ed971ca 4905 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4906 /* Moving to BR/EDR */
4907 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4908 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4909 result = L2CAP_MR_PEND;
4910 } else {
4911 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4912 result = L2CAP_MR_SUCCESS;
4913 }
4914 } else {
4915 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4916 /* Placeholder - uncomment when amp functions are available */
4917 /*amp_accept_physical(chan, req->dest_amp_id);*/
4918 result = L2CAP_MR_PEND;
4919 }
4920
4921send_move_response:
1500109b 4922 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4923
02b0fbb9
MM		 4924 l2cap_chan_unlock(chan);
4925
8d5a04a1
MM		 4926 return 0;
4927}
4928
5b155ef9
MM		 4929static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4930{
4931 struct l2cap_chan *chan;
4932 struct hci_chan *hchan = NULL;
4933
4934 chan = l2cap_get_chan_by_scid(conn, icid);
4935 if (!chan) {
4936 l2cap_send_move_chan_cfm_icid(conn, icid);
4937 return;
4938 }
4939
4940 __clear_chan_timer(chan);
4941 if (result == L2CAP_MR_PEND)
4942 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4943
4944 switch (chan->move_state) {
4945 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4946 /* Move confirm will be sent when logical link
4947 * is complete.
4948 */
4949 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4950 break;
4951 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4952 if (result == L2CAP_MR_PEND) {
4953 break;
4954 } else if (test_bit(CONN_LOCAL_BUSY,
4955 &chan->conn_state)) {
4956 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4957 } else {
4958 /* Logical link is up or moving to BR/EDR,
4959 * proceed with move
4960 */
4961 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4962 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4963 }
4964 break;
4965 case L2CAP_MOVE_WAIT_RSP:
4966 /* Moving to AMP */
4967 if (result == L2CAP_MR_SUCCESS) {
4968 /* Remote is ready, send confirm immediately
4969 * after logical link is ready
4970 */
4971 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4972 } else {
4973 /* Both logical link and move success
4974 * are required to confirm
4975 */
4976 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4977 }
4978
4979 /* Placeholder - get hci_chan for logical link */
4980 if (!hchan) {
4981 /* Logical link not available */
4982 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4983 break;
4984 }
4985
4986 /* If the logical link is not yet connected, do not
4987 * send confirmation.
4988 */
4989 if (hchan->state != BT_CONNECTED)
4990 break;
4991
4992 /* Logical link is already ready to go */
4993
4994 chan->hs_hcon = hchan->conn;
4995 chan->hs_hcon->l2cap_data = chan->conn;
4996
4997 if (result == L2CAP_MR_SUCCESS) {
4998 /* Can confirm now */
4999 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5000 } else {
5001 /* Now only need move success
5002 * to confirm
5003 */
5004 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5005 }
5006
5007 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5008 break;
5009 default:
5010 /* Any other amp move state means the move failed. */
5011 chan->move_id = chan->local_amp_id;
5012 l2cap_move_done(chan);
5013 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5014 }
5015
5016 l2cap_chan_unlock(chan);
5017}
5018
5019static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5020 u16 result)
5021{
5022 struct l2cap_chan *chan;
5023
5024 chan = l2cap_get_chan_by_ident(conn, ident);
5025 if (!chan) {
5026 /* Could not locate channel, icid is best guess */
5027 l2cap_send_move_chan_cfm_icid(conn, icid);
5028 return;
5029 }
5030
5031 __clear_chan_timer(chan);
5032
5033 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5034 if (result == L2CAP_MR_COLLISION) {
5035 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5036 } else {
5037 /* Cleanup - cancel move */
5038 chan->move_id = chan->local_amp_id;
5039 l2cap_move_done(chan);
5040 }
5041 }
5042
5043 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5044
5045 l2cap_chan_unlock(chan);
5046}
5047
5048static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5049 struct l2cap_cmd_hdr *cmd,
5050 u16 cmd_len, void *data)
8d5a04a1
MM		 5051{
5052 struct l2cap_move_chan_rsp *rsp = data;
5053 u16 icid, result;
5054
5055 if (cmd_len != sizeof(*rsp))
5056 return -EPROTO;
5057
5058 icid = le16_to_cpu(rsp->icid);
5059 result = le16_to_cpu(rsp->result);
5060
ad0ac6ca 5061 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5062
5b155ef9
MM		 5063 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5064 l2cap_move_continue(conn, icid, result);
5065 else
5066 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5067
5068 return 0;
5069}
5070
5f3847a4
MM		 5071static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5072 struct l2cap_cmd_hdr *cmd,
5073 u16 cmd_len, void *data)
8d5a04a1
MM		 5074{
5075 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5076 struct l2cap_chan *chan;
8d5a04a1
MM		 5077 u16 icid, result;
5078
5079 if (cmd_len != sizeof(*cfm))
5080 return -EPROTO;
5081
5082 icid = le16_to_cpu(cfm->icid);
5083 result = le16_to_cpu(cfm->result);
5084
ad0ac6ca 5085 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5086
5f3847a4
MM		 5087 chan = l2cap_get_chan_by_dcid(conn, icid);
5088 if (!chan) {
5089 /* Spec requires a response even if the icid was not found */
5090 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5091 return 0;
5092 }
5093
5094 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5095 if (result == L2CAP_MC_CONFIRMED) {
5096 chan->local_amp_id = chan->move_id;
6ed971ca 5097 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5098 __release_logical_link(chan);
5099 } else {
5100 chan->move_id = chan->local_amp_id;
5101 }
5102
5103 l2cap_move_done(chan);
5104 }
5105
8d5a04a1
MM		 5106 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5107
5f3847a4
MM		 5108 l2cap_chan_unlock(chan);
5109
8d5a04a1
MM		 5110 return 0;
5111}
5112
5113static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5114 struct l2cap_cmd_hdr *cmd,
5115 u16 cmd_len, void *data)
8d5a04a1
MM		 5116{
5117 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5118 struct l2cap_chan *chan;
8d5a04a1
MM		 5119 u16 icid;
5120
5121 if (cmd_len != sizeof(*rsp))
5122 return -EPROTO;
5123
5124 icid = le16_to_cpu(rsp->icid);
5125
ad0ac6ca 5126 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5127
3fd71a0a
MM		 5128 chan = l2cap_get_chan_by_scid(conn, icid);
5129 if (!chan)
5130 return 0;
5131
5132 __clear_chan_timer(chan);
5133
5134 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5135 chan->local_amp_id = chan->move_id;
5136
6ed971ca 5137 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5138 __release_logical_link(chan);
5139
5140 l2cap_move_done(chan);
5141 }
5142
5143 l2cap_chan_unlock(chan);
5144
8d5a04a1
MM		 5145 return 0;
5146}
5147
e2174ca4 5148static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 5149 u16 to_multiplier)
de73115a
CT		 5150{
5151 u16 max_latency;
5152
5153 if (min > max || min < 6 || max > 3200)
5154 return -EINVAL;
5155
5156 if (to_multiplier < 10 || to_multiplier > 3200)
5157 return -EINVAL;
5158
5159 if (max >= to_multiplier * 8)
5160 return -EINVAL;
5161
5162 max_latency = (to_multiplier * 8 / max) - 1;
5163 if (latency > 499 || latency > max_latency)
5164 return -EINVAL;
5165
5166 return 0;
5167}
5168
5169static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818
GP		 5170 struct l2cap_cmd_hdr *cmd,
5171 u8 *data)
de73115a
CT		 5172{
5173 struct hci_conn *hcon = conn->hcon;
5174 struct l2cap_conn_param_update_req *req;
5175 struct l2cap_conn_param_update_rsp rsp;
5176 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 5177 int err;
de73115a
CT		 5178
5179 if (!(hcon->link_mode & HCI_LM_MASTER))
5180 return -EINVAL;
5181
5182 cmd_len = __le16_to_cpu(cmd->len);
5183 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5184 return -EPROTO;
5185
5186 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5187 min = __le16_to_cpu(req->min);
5188 max = __le16_to_cpu(req->max);
de73115a
CT		 5189 latency = __le16_to_cpu(req->latency);
5190 to_multiplier = __le16_to_cpu(req->to_multiplier);
5191
5192 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5193 min, max, latency, to_multiplier);
de73115a
CT		 5194
5195 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5196
5197 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5198 if (err)
ac73498c 5199 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5200 else
ac73498c 5201 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5202
5203 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5204 sizeof(rsp), &rsp);
de73115a 5205
2ce603eb
CT		 5206 if (!err)
5207 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5208
de73115a
CT		 5209 return 0;
5210}
5211
3300d9a9 5212static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5213 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5214 u8 *data)
3300d9a9
CT		 5215{
5216 int err = 0;
5217
5218 switch (cmd->code) {
5219 case L2CAP_COMMAND_REJ:
cb3b3152 5220 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5221 break;
5222
5223 case L2CAP_CONN_REQ:
cb3b3152 5224 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5225 break;
5226
5227 case L2CAP_CONN_RSP:
f5a2598d 5228 case L2CAP_CREATE_CHAN_RSP:
9245e737 5229 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5230 break;
5231
5232 case L2CAP_CONF_REQ:
5233 err = l2cap_config_req(conn, cmd, cmd_len, data);
5234 break;
5235
5236 case L2CAP_CONF_RSP:
9245e737 5237 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5238 break;
5239
5240 case L2CAP_DISCONN_REQ:
cb3b3152 5241 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5242 break;
5243
5244 case L2CAP_DISCONN_RSP:
9245e737 5245 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5246 break;
5247
5248 case L2CAP_ECHO_REQ:
5249 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5250 break;
5251
5252 case L2CAP_ECHO_RSP:
5253 break;
5254
5255 case L2CAP_INFO_REQ:
cb3b3152 5256 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5257 break;
5258
5259 case L2CAP_INFO_RSP:
9245e737 5260 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5261 break;
5262
f94ff6ff
MM		 5263 case L2CAP_CREATE_CHAN_REQ:
5264 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5265 break;
5266
8d5a04a1
MM		 5267 case L2CAP_MOVE_CHAN_REQ:
5268 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5269 break;
5270
5271 case L2CAP_MOVE_CHAN_RSP:
9245e737 5272 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5273 break;
5274
5275 case L2CAP_MOVE_CHAN_CFM:
5276 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5277 break;
5278
5279 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5280 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5281 break;
5282
3300d9a9
CT		 5283 default:
5284 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5285 err = -EINVAL;
5286 break;
5287 }
5288
5289 return err;
5290}
5291
5292static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2d792818 5293 struct l2cap_cmd_hdr *cmd, u8 *data)
3300d9a9
CT		 5294{
5295 switch (cmd->code) {
5296 case L2CAP_COMMAND_REJ:
5297 return 0;
5298
5299 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 5300 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 5301
5302 case L2CAP_CONN_PARAM_UPDATE_RSP:
5303 return 0;
5304
5305 default:
5306 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5307 return -EINVAL;
5308 }
5309}
5310
7c2005d6
JH		 5311static __le16 l2cap_err_to_reason(int err)
5312{
5313 switch (err) {
5314 case -EBADSLT:
5315 return __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
5316 case -EMSGSIZE:
5317 return __constant_cpu_to_le16(L2CAP_REJ_MTU_EXCEEDED);
5318 case -EINVAL:
5319 case -EPROTO:
5320 default:
5321 return __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5322 }
5323}
5324
c5623556
JH		 5325static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5326 struct sk_buff *skb)
5327{
69c4e4e8 5328 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5329 struct l2cap_cmd_hdr *cmd;
5330 u16 len;
c5623556
JH		 5331 int err;
5332
69c4e4e8 5333 if (hcon->type != LE_LINK)
3b166295 5334 goto drop;
69c4e4e8 5335
4f3e219d
MH		 5336 if (skb->len < L2CAP_CMD_HDR_SIZE)
5337 goto drop;
c5623556 5338
4f3e219d
MH		 5339 cmd = (void *) skb->data;
5340 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5341
4f3e219d 5342 len = le16_to_cpu(cmd->len);
c5623556 5343
4f3e219d 5344 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5345
4f3e219d
MH		 5346 if (len != skb->len || !cmd->ident) {
5347 BT_DBG("corrupted command");
5348 goto drop;
5349 }
c5623556 5350
4f3e219d
MH		 5351 err = l2cap_le_sig_cmd(conn, cmd, skb->data);
5352 if (err) {
5353 struct l2cap_cmd_rej_unk rej;
c5623556 5354
4f3e219d 5355 BT_ERR("Wrong link type (%d)", err);
c5623556 5356
4f3e219d
MH		 5357 rej.reason = l2cap_err_to_reason(err);
5358 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5359 sizeof(rej), &rej);
c5623556
JH		 5360 }
5361
3b166295 5362drop:
c5623556
JH		 5363 kfree_skb(skb);
5364}
5365
3300d9a9 5366static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5367 struct sk_buff *skb)
1da177e4 5368{
69c4e4e8 5369 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5370 u8 *data = skb->data;
5371 int len = skb->len;
5372 struct l2cap_cmd_hdr cmd;
3300d9a9 5373 int err;
1da177e4
LT		 5374
5375 l2cap_raw_recv(conn, skb);
5376
69c4e4e8 5377 if (hcon->type != ACL_LINK)
3b166295 5378 goto drop;
69c4e4e8 5379
1da177e4 5380 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5381 u16 cmd_len;
1da177e4
LT		 5382 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5383 data += L2CAP_CMD_HDR_SIZE;
5384 len -= L2CAP_CMD_HDR_SIZE;
5385
88219a0f 5386 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5387
2d792818
GP		 5388 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5389 cmd.ident);
1da177e4 5390
88219a0f 5391 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5392 BT_DBG("corrupted command");
5393 break;
5394 }
5395
c5623556 5396 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5397 if (err) {
e2fd318e 5398 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5399
5400 BT_ERR("Wrong link type (%d)", err);
1da177e4 5401
7c2005d6 5402 rej.reason = l2cap_err_to_reason(err);
2d792818
GP		 5403 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5404 sizeof(rej), &rej);
1da177e4
LT		 5405 }
5406
88219a0f
AV		 5407 data += cmd_len;
5408 len -= cmd_len;
1da177e4
LT		 5409 }
5410
3b166295 5411drop:
1da177e4
LT		 5412 kfree_skb(skb);
5413}
5414
47d1ec61 5415static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5416{
5417 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5418 int hdr_size;
5419
5420 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5421 hdr_size = L2CAP_EXT_HDR_SIZE;
5422 else
5423 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5424
47d1ec61 5425 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5426 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5427 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5428 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5429
5430 if (our_fcs != rcv_fcs)
7a560e5c 5431 return -EBADMSG;
fcc203c3
GP		 5432 }
5433 return 0;
5434}
5435
6ea00485 5436static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5437{
e31f7633 5438 struct l2cap_ctrl control;
d5392c8f 5439
e31f7633 5440 BT_DBG("chan %p", chan);
d5392c8f 5441
e31f7633
MM		 5442 memset(&control, 0, sizeof(control));
5443 control.sframe = 1;
5444 control.final = 1;
5445 control.reqseq = chan->buffer_seq;
5446 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5447
e2ab4353 5448 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5449 control.super = L2CAP_SUPER_RNR;
5450 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5451 }
5452
e31f7633
MM		 5453 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5454 chan->unacked_frames > 0)
5455 __set_retrans_timer(chan);
d5392c8f 5456
e31f7633 5457 /* Send pending iframes */
525cd185 5458 l2cap_ertm_send(chan);
d5392c8f 5459
e2ab4353 5460 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5461 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5462 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5463 * send it now.
5464 */
5465 control.super = L2CAP_SUPER_RR;
5466 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5467 }
5468}
5469
2d792818
GP		 5470static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5471 struct sk_buff **last_frag)
18778a63 5472{
84084a31
MM		 5473 /* skb->len reflects data in skb as well as all fragments
5474 * skb->data_len reflects only data in fragments
5475 */
5476 if (!skb_has_frag_list(skb))
5477 skb_shinfo(skb)->frag_list = new_frag;
5478
5479 new_frag->next = NULL;
5480
5481 (*last_frag)->next = new_frag;
5482 *last_frag = new_frag;
5483
5484 skb->len += new_frag->len;
5485 skb->data_len += new_frag->len;
5486 skb->truesize += new_frag->truesize;
5487}
5488
4b51dae9
MM		 5489static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5490 struct l2cap_ctrl *control)
84084a31
MM		 5491{
5492 int err = -EINVAL;
18778a63 5493
4b51dae9 5494 switch (control->sar) {
7e0ef6ee 5495 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5496 if (chan->sdu)
5497 break;
18778a63 5498
80b98027 5499 err = chan->ops->recv(chan, skb);
84084a31 5500 break;
18778a63 5501
7e0ef6ee 5502 case L2CAP_SAR_START:
84084a31
MM		 5503 if (chan->sdu)
5504 break;
18778a63 5505
6f61fd47 5506 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5507 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5508
84084a31
MM		 5509 if (chan->sdu_len > chan->imtu) {
5510 err = -EMSGSIZE;
5511 break;
5512 }
1890d36b 5513
84084a31
MM		 5514 if (skb->len >= chan->sdu_len)
5515 break;
18778a63 5516
84084a31
MM		 5517 chan->sdu = skb;
5518 chan->sdu_last_frag = skb;
18778a63 5519
84084a31
MM		 5520 skb = NULL;
5521 err = 0;
18778a63
GP		 5522 break;
5523
7e0ef6ee 5524 case L2CAP_SAR_CONTINUE:
6f61fd47 5525 if (!chan->sdu)
84084a31 5526 break;
18778a63 5527
84084a31
MM		 5528 append_skb_frag(chan->sdu, skb,
5529 &chan->sdu_last_frag);
5530 skb = NULL;
18778a63 5531
84084a31
MM		 5532 if (chan->sdu->len >= chan->sdu_len)
5533 break;
4178ba46 5534
84084a31 5535 err = 0;
18778a63
GP		 5536 break;
5537
7e0ef6ee 5538 case L2CAP_SAR_END:
6f61fd47 5539 if (!chan->sdu)
84084a31 5540 break;
18778a63 5541
84084a31
MM		 5542 append_skb_frag(chan->sdu, skb,
5543 &chan->sdu_last_frag);
5544 skb = NULL;
4178ba46 5545
84084a31
MM		 5546 if (chan->sdu->len != chan->sdu_len)
5547 break;
18778a63 5548
80b98027 5549 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5550
84084a31
MM		 5551 if (!err) {
5552 /* Reassembly complete */
5553 chan->sdu = NULL;
5554 chan->sdu_last_frag = NULL;
5555 chan->sdu_len = 0;
1890d36b 5556 }
18778a63
GP		 5557 break;
5558 }
5559
84084a31
MM		 5560 if (err) {
5561 kfree_skb(skb);
5562 kfree_skb(chan->sdu);
5563 chan->sdu = NULL;
5564 chan->sdu_last_frag = NULL;
5565 chan->sdu_len = 0;
5566 }
18778a63 5567
84084a31 5568 return err;
18778a63
GP		 5569}
5570
32b32735
MM		 5571static int l2cap_resegment(struct l2cap_chan *chan)
5572{
5573 /* Placeholder */
5574 return 0;
5575}
5576
61aa4f5b 5577void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5578{
61aa4f5b 5579 u8 event;
712132eb 5580
61aa4f5b
MM		 5581 if (chan->mode != L2CAP_MODE_ERTM)
5582 return;
712132eb 5583
61aa4f5b 5584 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5585 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5586}
5587
d2a7ac5d
MM		 5588static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5589{
63838725
MM		 5590 int err = 0;
5591 /* Pass sequential frames to l2cap_reassemble_sdu()
5592 * until a gap is encountered.
5593 */
5594
5595 BT_DBG("chan %p", chan);
5596
5597 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5598 struct sk_buff *skb;
5599 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5600 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5601
5602 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5603
5604 if (!skb)
5605 break;
5606
5607 skb_unlink(skb, &chan->srej_q);
5608 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5609 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5610 if (err)
5611 break;
5612 }
5613
5614 if (skb_queue_empty(&chan->srej_q)) {
5615 chan->rx_state = L2CAP_RX_STATE_RECV;
5616 l2cap_send_ack(chan);
5617 }
5618
5619 return err;
d2a7ac5d
MM		 5620}
5621
5622static void l2cap_handle_srej(struct l2cap_chan *chan,
5623 struct l2cap_ctrl *control)
5624{
f80842a8
MM		 5625 struct sk_buff *skb;
5626
5627 BT_DBG("chan %p, control %p", chan, control);
5628
5629 if (control->reqseq == chan->next_tx_seq) {
5630 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5631 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5632 return;
5633 }
5634
5635 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5636
5637 if (skb == NULL) {
5638 BT_DBG("Seq %d not available for retransmission",
5639 control->reqseq);
5640 return;
5641 }
5642
5643 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5644 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5645 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5646 return;
5647 }
5648
5649 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5650
5651 if (control->poll) {
5652 l2cap_pass_to_tx(chan, control);
5653
5654 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5655 l2cap_retransmit(chan, control);
5656 l2cap_ertm_send(chan);
5657
5658 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5659 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5660 chan->srej_save_reqseq = control->reqseq;
5661 }
5662 } else {
5663 l2cap_pass_to_tx_fbit(chan, control);
5664
5665 if (control->final) {
5666 if (chan->srej_save_reqseq != control->reqseq ||
5667 !test_and_clear_bit(CONN_SREJ_ACT,
5668 &chan->conn_state))
5669 l2cap_retransmit(chan, control);
5670 } else {
5671 l2cap_retransmit(chan, control);
5672 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5673 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5674 chan->srej_save_reqseq = control->reqseq;
5675 }
5676 }
5677 }
d2a7ac5d
MM		 5678}
5679
5680static void l2cap_handle_rej(struct l2cap_chan *chan,
5681 struct l2cap_ctrl *control)
5682{
fcd289df
MM		 5683 struct sk_buff *skb;
5684
5685 BT_DBG("chan %p, control %p", chan, control);
5686
5687 if (control->reqseq == chan->next_tx_seq) {
5688 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5689 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5690 return;
5691 }
5692
5693 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5694
5695 if (chan->max_tx && skb &&
5696 bt_cb(skb)->control.retries >= chan->max_tx) {
5697 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5698 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5699 return;
5700 }
5701
5702 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5703
5704 l2cap_pass_to_tx(chan, control);
5705
5706 if (control->final) {
5707 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5708 l2cap_retransmit_all(chan, control);
5709 } else {
5710 l2cap_retransmit_all(chan, control);
5711 l2cap_ertm_send(chan);
5712 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5713 set_bit(CONN_REJ_ACT, &chan->conn_state);
5714 }
d2a7ac5d
MM		 5715}
5716
4b51dae9
MM		 5717static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5718{
5719 BT_DBG("chan %p, txseq %d", chan, txseq);
5720
5721 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5722 chan->expected_tx_seq);
5723
5724 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5725 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5726 chan->tx_win) {
4b51dae9
MM		 5727 /* See notes below regarding "double poll" and
5728 * invalid packets.
5729 */
5730 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5731 BT_DBG("Invalid/Ignore - after SREJ");
5732 return L2CAP_TXSEQ_INVALID_IGNORE;
5733 } else {
5734 BT_DBG("Invalid - in window after SREJ sent");
5735 return L2CAP_TXSEQ_INVALID;
5736 }
5737 }
5738
5739 if (chan->srej_list.head == txseq) {
5740 BT_DBG("Expected SREJ");
5741 return L2CAP_TXSEQ_EXPECTED_SREJ;
5742 }
5743
5744 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5745 BT_DBG("Duplicate SREJ - txseq already stored");
5746 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5747 }
5748
5749 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5750 BT_DBG("Unexpected SREJ - not requested");
5751 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5752 }
5753 }
5754
5755 if (chan->expected_tx_seq == txseq) {
5756 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5757 chan->tx_win) {
5758 BT_DBG("Invalid - txseq outside tx window");
5759 return L2CAP_TXSEQ_INVALID;
5760 } else {
5761 BT_DBG("Expected");
5762 return L2CAP_TXSEQ_EXPECTED;
5763 }
5764 }
5765
5766 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 5767 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 5768 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5769 return L2CAP_TXSEQ_DUPLICATE;
5770 }
5771
5772 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5773 /* A source of invalid packets is a "double poll" condition,
5774 * where delays cause us to send multiple poll packets. If
5775 * the remote stack receives and processes both polls,
5776 * sequence numbers can wrap around in such a way that a
5777 * resent frame has a sequence number that looks like new data
5778 * with a sequence gap. This would trigger an erroneous SREJ
5779 * request.
5780 *
5781 * Fortunately, this is impossible with a tx window that's
5782 * less than half of the maximum sequence number, which allows
5783 * invalid frames to be safely ignored.
5784 *
5785 * With tx window sizes greater than half of the tx window
5786 * maximum, the frame is invalid and cannot be ignored. This
5787 * causes a disconnect.
5788 */
5789
5790 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5791 BT_DBG("Invalid/Ignore - txseq outside tx window");
5792 return L2CAP_TXSEQ_INVALID_IGNORE;
5793 } else {
5794 BT_DBG("Invalid - txseq outside tx window");
5795 return L2CAP_TXSEQ_INVALID;
5796 }
5797 } else {
5798 BT_DBG("Unexpected - txseq indicates missing frames");
5799 return L2CAP_TXSEQ_UNEXPECTED;
5800 }
5801}
5802
d2a7ac5d
MM		 5803static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5804 struct l2cap_ctrl *control,
5805 struct sk_buff *skb, u8 event)
5806{
5807 int err = 0;
941247f9 5808 bool skb_in_use = false;
d2a7ac5d
MM		 5809
5810 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5811 event);
5812
5813 switch (event) {
5814 case L2CAP_EV_RECV_IFRAME:
5815 switch (l2cap_classify_txseq(chan, control->txseq)) {
5816 case L2CAP_TXSEQ_EXPECTED:
5817 l2cap_pass_to_tx(chan, control);
5818
5819 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5820 BT_DBG("Busy, discarding expected seq %d",
5821 control->txseq);
5822 break;
5823 }
5824
5825 chan->expected_tx_seq = __next_seq(chan,
5826 control->txseq);
5827
5828 chan->buffer_seq = chan->expected_tx_seq;
941247f9 5829 skb_in_use = true;
d2a7ac5d
MM		 5830
5831 err = l2cap_reassemble_sdu(chan, skb, control);
5832 if (err)
5833 break;
5834
5835 if (control->final) {
5836 if (!test_and_clear_bit(CONN_REJ_ACT,
5837 &chan->conn_state)) {
5838 control->final = 0;
5839 l2cap_retransmit_all(chan, control);
5840 l2cap_ertm_send(chan);
5841 }
5842 }
5843
5844 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5845 l2cap_send_ack(chan);
5846 break;
5847 case L2CAP_TXSEQ_UNEXPECTED:
5848 l2cap_pass_to_tx(chan, control);
5849
5850 /* Can't issue SREJ frames in the local busy state.
5851 * Drop this frame, it will be seen as missing
5852 * when local busy is exited.
5853 */
5854 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5855 BT_DBG("Busy, discarding unexpected seq %d",
5856 control->txseq);
5857 break;
5858 }
5859
5860 /* There was a gap in the sequence, so an SREJ
5861 * must be sent for each missing frame. The
5862 * current frame is stored for later use.
5863 */
5864 skb_queue_tail(&chan->srej_q, skb);
941247f9 5865 skb_in_use = true;
d2a7ac5d
MM		 5866 BT_DBG("Queued %p (queue len %d)", skb,
5867 skb_queue_len(&chan->srej_q));
5868
5869 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5870 l2cap_seq_list_clear(&chan->srej_list);
5871 l2cap_send_srej(chan, control->txseq);
5872
5873 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5874 break;
5875 case L2CAP_TXSEQ_DUPLICATE:
5876 l2cap_pass_to_tx(chan, control);
5877 break;
5878 case L2CAP_TXSEQ_INVALID_IGNORE:
5879 break;
5880 case L2CAP_TXSEQ_INVALID:
5881 default:
5e4e3972 5882 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 5883 break;
5884 }
5885 break;
5886 case L2CAP_EV_RECV_RR:
5887 l2cap_pass_to_tx(chan, control);
5888 if (control->final) {
5889 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5890
e6a3ee6e
MM		 5891 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5892 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 5893 control->final = 0;
5894 l2cap_retransmit_all(chan, control);
5895 }
5896
5897 l2cap_ertm_send(chan);
5898 } else if (control->poll) {
5899 l2cap_send_i_or_rr_or_rnr(chan);
5900 } else {
5901 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5902 &chan->conn_state) &&
5903 chan->unacked_frames)
5904 __set_retrans_timer(chan);
5905
5906 l2cap_ertm_send(chan);
5907 }
5908 break;
5909 case L2CAP_EV_RECV_RNR:
5910 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5911 l2cap_pass_to_tx(chan, control);
5912 if (control && control->poll) {
5913 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5914 l2cap_send_rr_or_rnr(chan, 0);
5915 }
5916 __clear_retrans_timer(chan);
5917 l2cap_seq_list_clear(&chan->retrans_list);
5918 break;
5919 case L2CAP_EV_RECV_REJ:
5920 l2cap_handle_rej(chan, control);
5921 break;
5922 case L2CAP_EV_RECV_SREJ:
5923 l2cap_handle_srej(chan, control);
5924 break;
5925 default:
5926 break;
5927 }
5928
5929 if (skb && !skb_in_use) {
5930 BT_DBG("Freeing %p", skb);
5931 kfree_skb(skb);
5932 }
5933
5934 return err;
5935}
5936
5937static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5938 struct l2cap_ctrl *control,
5939 struct sk_buff *skb, u8 event)
5940{
5941 int err = 0;
5942 u16 txseq = control->txseq;
941247f9 5943 bool skb_in_use = false;
d2a7ac5d
MM		 5944
5945 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5946 event);
5947
5948 switch (event) {
5949 case L2CAP_EV_RECV_IFRAME:
5950 switch (l2cap_classify_txseq(chan, txseq)) {
5951 case L2CAP_TXSEQ_EXPECTED:
5952 /* Keep frame for reassembly later */
5953 l2cap_pass_to_tx(chan, control);
5954 skb_queue_tail(&chan->srej_q, skb);
941247f9 5955 skb_in_use = true;
d2a7ac5d
MM		 5956 BT_DBG("Queued %p (queue len %d)", skb,
5957 skb_queue_len(&chan->srej_q));
5958
5959 chan->expected_tx_seq = __next_seq(chan, txseq);
5960 break;
5961 case L2CAP_TXSEQ_EXPECTED_SREJ:
5962 l2cap_seq_list_pop(&chan->srej_list);
5963
5964 l2cap_pass_to_tx(chan, control);
5965 skb_queue_tail(&chan->srej_q, skb);
941247f9 5966 skb_in_use = true;
d2a7ac5d
MM		 5967 BT_DBG("Queued %p (queue len %d)", skb,
5968 skb_queue_len(&chan->srej_q));
5969
5970 err = l2cap_rx_queued_iframes(chan);
5971 if (err)
5972 break;
5973
5974 break;
5975 case L2CAP_TXSEQ_UNEXPECTED:
5976 /* Got a frame that can't be reassembled yet.
5977 * Save it for later, and send SREJs to cover
5978 * the missing frames.
5979 */
5980 skb_queue_tail(&chan->srej_q, skb);
941247f9 5981 skb_in_use = true;
d2a7ac5d
MM		 5982 BT_DBG("Queued %p (queue len %d)", skb,
5983 skb_queue_len(&chan->srej_q));
5984
5985 l2cap_pass_to_tx(chan, control);
5986 l2cap_send_srej(chan, control->txseq);
5987 break;
5988 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5989 /* This frame was requested with an SREJ, but
5990 * some expected retransmitted frames are
5991 * missing. Request retransmission of missing
5992 * SREJ'd frames.
5993 */
5994 skb_queue_tail(&chan->srej_q, skb);
941247f9 5995 skb_in_use = true;
d2a7ac5d
MM		 5996 BT_DBG("Queued %p (queue len %d)", skb,
5997 skb_queue_len(&chan->srej_q));
5998
5999 l2cap_pass_to_tx(chan, control);
6000 l2cap_send_srej_list(chan, control->txseq);
6001 break;
6002 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6003 /* We've already queued this frame. Drop this copy. */
6004 l2cap_pass_to_tx(chan, control);
6005 break;
6006 case L2CAP_TXSEQ_DUPLICATE:
6007 /* Expecting a later sequence number, so this frame
6008 * was already received. Ignore it completely.
6009 */
6010 break;
6011 case L2CAP_TXSEQ_INVALID_IGNORE:
6012 break;
6013 case L2CAP_TXSEQ_INVALID:
6014 default:
5e4e3972 6015 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6016 break;
6017 }
6018 break;
6019 case L2CAP_EV_RECV_RR:
6020 l2cap_pass_to_tx(chan, control);
6021 if (control->final) {
6022 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6023
6024 if (!test_and_clear_bit(CONN_REJ_ACT,
6025 &chan->conn_state)) {
6026 control->final = 0;
6027 l2cap_retransmit_all(chan, control);
6028 }
6029
6030 l2cap_ertm_send(chan);
6031 } else if (control->poll) {
6032 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6033 &chan->conn_state) &&
6034 chan->unacked_frames) {
6035 __set_retrans_timer(chan);
6036 }
6037
6038 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6039 l2cap_send_srej_tail(chan);
6040 } else {
6041 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6042 &chan->conn_state) &&
6043 chan->unacked_frames)
6044 __set_retrans_timer(chan);
6045
6046 l2cap_send_ack(chan);
6047 }
6048 break;
6049 case L2CAP_EV_RECV_RNR:
6050 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6051 l2cap_pass_to_tx(chan, control);
6052 if (control->poll) {
6053 l2cap_send_srej_tail(chan);
6054 } else {
6055 struct l2cap_ctrl rr_control;
6056 memset(&rr_control, 0, sizeof(rr_control));
6057 rr_control.sframe = 1;
6058 rr_control.super = L2CAP_SUPER_RR;
6059 rr_control.reqseq = chan->buffer_seq;
6060 l2cap_send_sframe(chan, &rr_control);
6061 }
6062
6063 break;
6064 case L2CAP_EV_RECV_REJ:
6065 l2cap_handle_rej(chan, control);
6066 break;
6067 case L2CAP_EV_RECV_SREJ:
6068 l2cap_handle_srej(chan, control);
6069 break;
6070 }
6071
6072 if (skb && !skb_in_use) {
6073 BT_DBG("Freeing %p", skb);
6074 kfree_skb(skb);
6075 }
6076
6077 return err;
6078}
6079
32b32735
MM		 6080static int l2cap_finish_move(struct l2cap_chan *chan)
6081{
6082 BT_DBG("chan %p", chan);
6083
6084 chan->rx_state = L2CAP_RX_STATE_RECV;
6085
6086 if (chan->hs_hcon)
6087 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6088 else
6089 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6090
6091 return l2cap_resegment(chan);
6092}
6093
6094static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6095 struct l2cap_ctrl *control,
6096 struct sk_buff *skb, u8 event)
6097{
6098 int err;
6099
6100 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6101 event);
6102
6103 if (!control->poll)
6104 return -EPROTO;
6105
6106 l2cap_process_reqseq(chan, control->reqseq);
6107
6108 if (!skb_queue_empty(&chan->tx_q))
6109 chan->tx_send_head = skb_peek(&chan->tx_q);
6110 else
6111 chan->tx_send_head = NULL;
6112
6113 /* Rewind next_tx_seq to the point expected
6114 * by the receiver.
6115 */
6116 chan->next_tx_seq = control->reqseq;
6117 chan->unacked_frames = 0;
6118
6119 err = l2cap_finish_move(chan);
6120 if (err)
6121 return err;
6122
6123 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6124 l2cap_send_i_or_rr_or_rnr(chan);
6125
6126 if (event == L2CAP_EV_RECV_IFRAME)
6127 return -EPROTO;
6128
6129 return l2cap_rx_state_recv(chan, control, NULL, event);
6130}
6131
6132static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6133 struct l2cap_ctrl *control,
6134 struct sk_buff *skb, u8 event)
6135{
6136 int err;
6137
6138 if (!control->final)
6139 return -EPROTO;
6140
6141 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6142
6143 chan->rx_state = L2CAP_RX_STATE_RECV;
6144 l2cap_process_reqseq(chan, control->reqseq);
6145
6146 if (!skb_queue_empty(&chan->tx_q))
6147 chan->tx_send_head = skb_peek(&chan->tx_q);
6148 else
6149 chan->tx_send_head = NULL;
6150
6151 /* Rewind next_tx_seq to the point expected
6152 * by the receiver.
6153 */
6154 chan->next_tx_seq = control->reqseq;
6155 chan->unacked_frames = 0;
6156
6157 if (chan->hs_hcon)
6158 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6159 else
6160 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6161
6162 err = l2cap_resegment(chan);
6163
6164 if (!err)
6165 err = l2cap_rx_state_recv(chan, control, skb, event);
6166
6167 return err;
6168}
6169
d2a7ac5d
MM		 6170static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6171{
6172 /* Make sure reqseq is for a packet that has been sent but not acked */
6173 u16 unacked;
6174
6175 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6176 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6177}
6178
cec8ab6e
MM		 6179static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6180 struct sk_buff *skb, u8 event)
218bb9df 6181{
d2a7ac5d
MM		 6182 int err = 0;
6183
6184 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6185 control, skb, event, chan->rx_state);
6186
6187 if (__valid_reqseq(chan, control->reqseq)) {
6188 switch (chan->rx_state) {
6189 case L2CAP_RX_STATE_RECV:
6190 err = l2cap_rx_state_recv(chan, control, skb, event);
6191 break;
6192 case L2CAP_RX_STATE_SREJ_SENT:
6193 err = l2cap_rx_state_srej_sent(chan, control, skb,
6194 event);
6195 break;
32b32735
MM		 6196 case L2CAP_RX_STATE_WAIT_P:
6197 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6198 break;
6199 case L2CAP_RX_STATE_WAIT_F:
6200 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6201 break;
d2a7ac5d
MM		 6202 default:
6203 /* shut it down */
6204 break;
6205 }
6206 } else {
6207 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6208 control->reqseq, chan->next_tx_seq,
6209 chan->expected_ack_seq);
5e4e3972 6210 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6211 }
6212
6213 return err;
cec8ab6e
MM		 6214}
6215
6216static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6217 struct sk_buff *skb)
6218{
4b51dae9
MM		 6219 int err = 0;
6220
6221 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6222 chan->rx_state);
6223
6224 if (l2cap_classify_txseq(chan, control->txseq) ==
6225 L2CAP_TXSEQ_EXPECTED) {
6226 l2cap_pass_to_tx(chan, control);
6227
6228 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6229 __next_seq(chan, chan->buffer_seq));
6230
6231 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6232
6233 l2cap_reassemble_sdu(chan, skb, control);
6234 } else {
6235 if (chan->sdu) {
6236 kfree_skb(chan->sdu);
6237 chan->sdu = NULL;
6238 }
6239 chan->sdu_last_frag = NULL;
6240 chan->sdu_len = 0;
6241
6242 if (skb) {
6243 BT_DBG("Freeing %p", skb);
6244 kfree_skb(skb);
6245 }
6246 }
6247
6248 chan->last_acked_seq = control->txseq;
6249 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6250
6251 return err;
cec8ab6e
MM		 6252}
6253
6254static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6255{
6256 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6257 u16 len;
6258 u8 event;
218bb9df 6259
b76bbd66
MM		 6260 __unpack_control(chan, skb);
6261
218bb9df
GP		 6262 len = skb->len;
6263
6264 /*
6265 * We can just drop the corrupted I-frame here.
6266 * Receiver will miss it and start proper recovery
cec8ab6e 6267 * procedures and ask for retransmission.
218bb9df 6268 */
47d1ec61 6269 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6270 goto drop;
6271
cec8ab6e 6272 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6273 len -= L2CAP_SDULEN_SIZE;
218bb9df 6274
47d1ec61 6275 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6276 len -= L2CAP_FCS_SIZE;
218bb9df 6277
47d1ec61 6278 if (len > chan->mps) {
5e4e3972 6279 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6280 goto drop;
6281 }
6282
cec8ab6e
MM		 6283 if (!control->sframe) {
6284 int err;
218bb9df 6285
cec8ab6e
MM		 6286 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6287 control->sar, control->reqseq, control->final,
6288 control->txseq);
218bb9df 6289
cec8ab6e
MM		 6290 /* Validate F-bit - F=0 always valid, F=1 only
6291 * valid in TX WAIT_F
6292 */
6293 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6294 goto drop;
cec8ab6e
MM		 6295
6296 if (chan->mode != L2CAP_MODE_STREAMING) {
6297 event = L2CAP_EV_RECV_IFRAME;
6298 err = l2cap_rx(chan, control, skb, event);
6299 } else {
6300 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6301 }
6302
cec8ab6e 6303 if (err)
5e4e3972 6304 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6305 } else {
cec8ab6e
MM		 6306 const u8 rx_func_to_event[4] = {
6307 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6308 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6309 };
6310
6311 /* Only I-frames are expected in streaming mode */
6312 if (chan->mode == L2CAP_MODE_STREAMING)
6313 goto drop;
6314
6315 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6316 control->reqseq, control->final, control->poll,
6317 control->super);
6318
218bb9df 6319 if (len != 0) {
1bb166e6 6320 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6321 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6322 goto drop;
6323 }
6324
cec8ab6e
MM		 6325 /* Validate F and P bits */
6326 if (control->final && (control->poll ||
6327 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6328 goto drop;
6329
6330 event = rx_func_to_event[control->super];
6331 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6332 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6333 }
6334
6335 return 0;
6336
6337drop:
6338 kfree_skb(skb);
6339 return 0;
6340}
6341
13ca56e0
AE		 6342static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6343 struct sk_buff *skb)
1da177e4 6344{
48454079 6345 struct l2cap_chan *chan;
1da177e4 6346
baa7e1fa 6347 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6348 if (!chan) {
97e8e89d
AE		 6349 if (cid == L2CAP_CID_A2MP) {
6350 chan = a2mp_channel_create(conn, skb);
6351 if (!chan) {
6352 kfree_skb(skb);
13ca56e0 6353 return;
97e8e89d
AE		 6354 }
6355
6356 l2cap_chan_lock(chan);
6357 } else {
6358 BT_DBG("unknown cid 0x%4.4x", cid);
6359 /* Drop packet and return */
6360 kfree_skb(skb);
13ca56e0 6361 return;
97e8e89d 6362 }
1da177e4
LT		 6363 }
6364
49208c9c 6365 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6366
89bc500e 6367 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6368 goto drop;
6369
0c1bc5c6 6370 switch (chan->mode) {
1c2acffb
GP		 6371 case L2CAP_MODE_BASIC:
6372 /* If socket recv buffers overflows we drop data here
6373 * which is *bad* because L2CAP has to be reliable.
6374 * But we don't have any other choice. L2CAP doesn't
6375 * provide flow control mechanism. */
1da177e4 6376
0c1bc5c6 6377 if (chan->imtu < skb->len)
1c2acffb 6378 goto drop;
1da177e4 6379
80b98027 6380 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6381 goto done;
6382 break;
6383
6384 case L2CAP_MODE_ERTM:
6840ed07 6385 case L2CAP_MODE_STREAMING:
cec8ab6e 6386 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6387 goto done;
6388
1c2acffb 6389 default:
0c1bc5c6 6390 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6391 break;
6392 }
1da177e4
LT		 6393
6394drop:
6395 kfree_skb(skb);
6396
6397done:
6be36555 6398 l2cap_chan_unlock(chan);
1da177e4
LT		 6399}
6400
84104b24
AE		 6401static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6402 struct sk_buff *skb)
1da177e4 6403{
ae4fd2d3 6404 struct hci_conn *hcon = conn->hcon;
23691d75 6405 struct l2cap_chan *chan;
1da177e4 6406
ae4fd2d3
MH		 6407 if (hcon->type != ACL_LINK)
6408 goto drop;
6409
6f59b904 6410 chan = l2cap_global_chan_by_psm(0, psm, &conn->hcon->src,
98e0f7ea 6411 &conn->hcon->dst);
23691d75 6412 if (!chan)
1da177e4
LT		 6413 goto drop;
6414
5b4cedaa 6415 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6416
89bc500e 6417 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6418 goto drop;
6419
e13e21dc 6420 if (chan->imtu < skb->len)
1da177e4
LT		 6421 goto drop;
6422
2edf870d
MH		 6423 /* Store remote BD_ADDR and PSM for msg_name */
6424 bacpy(&bt_cb(skb)->bdaddr, &conn->hcon->dst);
6425 bt_cb(skb)->psm = psm;
6426
80b98027 6427 if (!chan->ops->recv(chan, skb))
84104b24 6428 return;
1da177e4
LT		 6429
6430drop:
6431 kfree_skb(skb);
1da177e4
LT		 6432}
6433
72f78356 6434static void l2cap_att_channel(struct l2cap_conn *conn,
6810fca7 6435 struct sk_buff *skb)
9f69bda6 6436{
b99707d7 6437 struct hci_conn *hcon = conn->hcon;
23691d75 6438 struct l2cap_chan *chan;
9f69bda6 6439
b99707d7
MH		 6440 if (hcon->type != LE_LINK)
6441 goto drop;
6442
af1c0134 6443 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
6f59b904 6444 &conn->hcon->src, &conn->hcon->dst);
23691d75 6445 if (!chan)
9f69bda6
GP		 6446 goto drop;
6447
5b4cedaa 6448 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6449
e13e21dc 6450 if (chan->imtu < skb->len)
9f69bda6
GP		 6451 goto drop;
6452
80b98027 6453 if (!chan->ops->recv(chan, skb))
6810fca7 6454 return;
9f69bda6
GP		 6455
6456drop:
6457 kfree_skb(skb);
9f69bda6
GP		 6458}
6459
1da177e4
LT		 6460static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6461{
6462 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 6463 u16 cid, len;
6464 __le16 psm;
1da177e4
LT		 6465
6466 skb_pull(skb, L2CAP_HDR_SIZE);
6467 cid = __le16_to_cpu(lh->cid);
6468 len = __le16_to_cpu(lh->len);
6469
1c2acffb
GP		 6470 if (len != skb->len) {
6471 kfree_skb(skb);
6472 return;
6473 }
6474
1da177e4
LT		 6475 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6476
6477 switch (cid) {
8db4dc46 6478 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6479 l2cap_sig_channel(conn, skb);
6480 break;
6481
8db4dc46 6482 case L2CAP_CID_CONN_LESS:
097db76c 6483 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6484 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6485 l2cap_conless_channel(conn, psm, skb);
6486 break;
6487
073d1cf3 6488 case L2CAP_CID_ATT:
72f78356 6489 l2cap_att_channel(conn, skb);
9f69bda6
GP		 6490 break;
6491
a2877629
MH		 6492 case L2CAP_CID_LE_SIGNALING:
6493 l2cap_le_sig_channel(conn, skb);
6494 break;
6495
b501d6a1
AB		 6496 case L2CAP_CID_SMP:
6497 if (smp_sig_channel(conn, skb))
6498 l2cap_conn_del(conn->hcon, EACCES);
6499 break;
6500
1da177e4
LT		 6501 default:
6502 l2cap_data_channel(conn, cid, skb);
6503 break;
6504 }
6505}
6506
6507/* ---- L2CAP interface with lower layer (HCI) ---- */
6508
686ebf28 6509int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 6510{
6511 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 6512 struct l2cap_chan *c;
1da177e4 6513
6ed93dc6 6514 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 6515
6516 /* Find listening sockets and check their link_mode */
23691d75
GP		 6517 read_lock(&chan_list_lock);
6518 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 6519 if (c->state != BT_LISTEN)
1da177e4
LT		 6520 continue;
6521
7eafc59e 6522 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 6523 lm1 |= HCI_LM_ACCEPT;
43bd0f32 6524 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 6525 lm1 |= HCI_LM_MASTER;
1da177e4 6526 exact++;
7eafc59e 6527 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 6528 lm2 |= HCI_LM_ACCEPT;
43bd0f32 6529 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 6530 lm2 |= HCI_LM_MASTER;
6531 }
1da177e4 6532 }
23691d75 6533 read_unlock(&chan_list_lock);
1da177e4
LT		 6534
6535 return exact ? lm1 : lm2;
6536}
6537
9e664631 6538void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 6539{
0139418c
MH		 6540 struct l2cap_conn *conn;
6541
6ed93dc6 6542 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 6543
1da177e4 6544 if (!status) {
baf43251 6545 conn = l2cap_conn_add(hcon);
1da177e4
LT		 6546 if (conn)
6547 l2cap_conn_ready(conn);
ba6fc317 6548 } else {
e175072f 6549 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 6550 }
1da177e4
LT		 6551}
6552
686ebf28 6553int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 6554{
6555 struct l2cap_conn *conn = hcon->l2cap_data;
6556
6557 BT_DBG("hcon %p", hcon);
6558
686ebf28 6559 if (!conn)
9f5a0d7b 6560 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 6561 return conn->disc_reason;
6562}
6563
9e664631 6564void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 6565{
6566 BT_DBG("hcon %p reason %d", hcon, reason);
6567
e175072f 6568 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 6569}
6570
4343478f 6571static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 6572{
715ec005 6573 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 6574 return;
6575
f62e4323 6576 if (encrypt == 0x00) {
4343478f 6577 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 6578 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 6579 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 6580 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 6581 } else {
4343478f 6582 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 6583 __clear_chan_timer(chan);
f62e4323
MH		 6584 }
6585}
6586
686ebf28 6587int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 6588{
0139418c 6589 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 6590 struct l2cap_chan *chan;
1da177e4 6591
0139418c 6592 if (!conn)
1da177e4 6593 return 0;
0139418c 6594
89d8b407 6595 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 6596
160dc6ac 6597 if (hcon->type == LE_LINK) {
35d4adcc
HG		 6598 if (!status && encrypt)
6599 smp_distribute_keys(conn, 0);
17cd3f37 6600 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 6601 }
6602
3df91ea2 6603 mutex_lock(&conn->chan_lock);
1da177e4 6604
3df91ea2 6605 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 6606 l2cap_chan_lock(chan);
1da177e4 6607
89d8b407
AE		 6608 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6609 state_to_string(chan->state));
f1cb9af5 6610
78eb2f98
AE		 6611 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6612 l2cap_chan_unlock(chan);
6613 continue;
6614 }
6615
073d1cf3 6616 if (chan->scid == L2CAP_CID_ATT) {
f1cb9af5
VCG		 6617 if (!status && encrypt) {
6618 chan->sec_level = hcon->sec_level;
cf4cd009 6619 l2cap_chan_ready(chan);
f1cb9af5
VCG		 6620 }
6621
6be36555 6622 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 6623 continue;
6624 }
6625
96eff46e 6626 if (!__l2cap_no_conn_pending(chan)) {
6be36555 6627 l2cap_chan_unlock(chan);
6a8d3010
MH		 6628 continue;
6629 }
6630
89bc500e 6631 if (!status && (chan->state == BT_CONNECTED ||
2d792818 6632 chan->state == BT_CONFIG)) {
d97c899b 6633 chan->ops->resume(chan);
4343478f 6634 l2cap_check_encryption(chan, encrypt);
6be36555 6635 l2cap_chan_unlock(chan);
9719f8af
MH		 6636 continue;
6637 }
6638
89bc500e 6639 if (chan->state == BT_CONNECT) {
b1235d79 6640 if (!status) {
93c3e8f5 6641 l2cap_start_connection(chan);
b1235d79 6642 } else {
ba13ccd9 6643 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 6644 }
89bc500e 6645 } else if (chan->state == BT_CONNECT2) {
6be36555 6646 struct sock *sk = chan->sk;
b1235d79 6647 struct l2cap_conn_rsp rsp;
df3c3931 6648 __u16 res, stat;
1da177e4 6649
6be36555
AE		 6650 lock_sock(sk);
6651
b1235d79 6652 if (!status) {
bdc25783 6653 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 6654 res = L2CAP_CR_PEND;
6655 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 6656 chan->ops->defer(chan);
df3c3931 6657 } else {
0e587be7 6658 __l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 6659 res = L2CAP_CR_SUCCESS;
6660 stat = L2CAP_CS_NO_INFO;
6661 }
b1235d79 6662 } else {
0e587be7 6663 __l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 6664 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 6665 res = L2CAP_CR_SEC_BLOCK;
6666 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 6667 }
6668
6be36555
AE		 6669 release_sock(sk);
6670
fe4128e0
GP		 6671 rsp.scid = cpu_to_le16(chan->dcid);
6672 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 6673 rsp.result = cpu_to_le16(res);
6674 rsp.status = cpu_to_le16(stat);
fc7f8a7e 6675 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 6676 sizeof(rsp), &rsp);
2d369359
MM		 6677
6678 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6679 res == L2CAP_CR_SUCCESS) {
6680 char buf[128];
6681 set_bit(CONF_REQ_SENT, &chan->conf_state);
6682 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6683 L2CAP_CONF_REQ,
6684 l2cap_build_conf_req(chan, buf),
6685 buf);
6686 chan->num_conf_req++;
6687 }
b1235d79 6688 }
1da177e4 6689
6be36555 6690 l2cap_chan_unlock(chan);
1da177e4
LT		 6691 }
6692
3df91ea2 6693 mutex_unlock(&conn->chan_lock);
b1235d79 6694
1da177e4
LT		 6695 return 0;
6696}
6697
686ebf28 6698int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 6699{
6700 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 6701 struct l2cap_hdr *hdr;
6702 int len;
1da177e4 6703
1d13a254
AE		 6704 /* For AMP controller do not create l2cap conn */
6705 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6706 goto drop;
1da177e4 6707
5a08ecce 6708 if (!conn)
baf43251 6709 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 6710
6711 if (!conn)
1da177e4
LT		 6712 goto drop;
6713
6714 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6715
d73a0988
AE		 6716 switch (flags) {
6717 case ACL_START:
6718 case ACL_START_NO_FLUSH:
6719 case ACL_COMPLETE:
1da177e4
LT		 6720 if (conn->rx_len) {
6721 BT_ERR("Unexpected start frame (len %d)", skb->len);
6722 kfree_skb(conn->rx_skb);
6723 conn->rx_skb = NULL;
6724 conn->rx_len = 0;
6725 l2cap_conn_unreliable(conn, ECOMM);
6726 }
6727
aae7fe22
AE		 6728 /* Start fragment always begin with Basic L2CAP header */
6729 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 6730 BT_ERR("Frame is too short (len %d)", skb->len);
6731 l2cap_conn_unreliable(conn, ECOMM);
6732 goto drop;
6733 }
6734
6735 hdr = (struct l2cap_hdr *) skb->data;
6736 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6737
6738 if (len == skb->len) {
6739 /* Complete frame received */
6740 l2cap_recv_frame(conn, skb);
6741 return 0;
6742 }
6743
6744 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6745
6746 if (skb->len > len) {
6747 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 6748 skb->len, len);
1da177e4
LT		 6749 l2cap_conn_unreliable(conn, ECOMM);
6750 goto drop;
6751 }
6752
6753 /* Allocate skb for the complete frame (with header) */
8bcde1f2 6754 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 6755 if (!conn->rx_skb)
1da177e4
LT		 6756 goto drop;
6757
d626f62b 6758 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6759 skb->len);
1da177e4 6760 conn->rx_len = len - skb->len;
d73a0988
AE		 6761 break;
6762
6763 case ACL_CONT:
1da177e4
LT		 6764 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6765
6766 if (!conn->rx_len) {
6767 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6768 l2cap_conn_unreliable(conn, ECOMM);
6769 goto drop;
6770 }
6771
6772 if (skb->len > conn->rx_len) {
6773 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 6774 skb->len, conn->rx_len);
1da177e4
LT		 6775 kfree_skb(conn->rx_skb);
6776 conn->rx_skb = NULL;
6777 conn->rx_len = 0;
6778 l2cap_conn_unreliable(conn, ECOMM);
6779 goto drop;
6780 }
6781
d626f62b 6782 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 6783 skb->len);
1da177e4
LT		 6784 conn->rx_len -= skb->len;
6785
6786 if (!conn->rx_len) {
c4e5bafa
JH		 6787 /* Complete frame received. l2cap_recv_frame
6788 * takes ownership of the skb so set the global
6789 * rx_skb pointer to NULL first.
6790 */
6791 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 6792 conn->rx_skb = NULL;
c4e5bafa 6793 l2cap_recv_frame(conn, rx_skb);
1da177e4 6794 }
d73a0988 6795 break;
1da177e4
LT		 6796 }
6797
6798drop:
6799 kfree_skb(skb);
6800 return 0;
6801}
6802
aef7d97c 6803static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 6804{
23691d75 6805 struct l2cap_chan *c;
1da177e4 6806
333055f2 6807 read_lock(&chan_list_lock);
1da177e4 6808
23691d75 6809 list_for_each_entry(c, &chan_list, global_l) {
fcb73338 6810 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7eafc59e 6811 &c->src, &c->dst,
fcb73338
AE		 6812 c->state, __le16_to_cpu(c->psm),
6813 c->scid, c->dcid, c->imtu, c->omtu,
6814 c->sec_level, c->mode);
61e1b4b7 6815 }
1da177e4 6816
333055f2 6817 read_unlock(&chan_list_lock);
1da177e4 6818
aef7d97c 6819 return 0;
1da177e4
LT		 6820}
6821
aef7d97c
MH		 6822static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6823{
6824 return single_open(file, l2cap_debugfs_show, inode->i_private);
6825}
6826
6827static const struct file_operations l2cap_debugfs_fops = {
6828 .open = l2cap_debugfs_open,
6829 .read = seq_read,
6830 .llseek = seq_lseek,
6831 .release = single_release,
6832};
6833
6834static struct dentry *l2cap_debugfs;
1da177e4 6835
64274518 6836int __init l2cap_init(void)
1da177e4
LT		 6837{
6838 int err;
be9d1227 6839
bb58f747 6840 err = l2cap_init_sockets();
1da177e4
LT		 6841 if (err < 0)
6842 return err;
6843
aef7d97c 6844 if (bt_debugfs) {
2d792818
GP		 6845 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6846 NULL, &l2cap_debugfs_fops);
aef7d97c
MH		 6847 if (!l2cap_debugfs)
6848 BT_ERR("Failed to create L2CAP debug file");
6849 }
1da177e4 6850
1da177e4 6851 return 0;
1da177e4
LT		 6852}
6853
64274518 6854void l2cap_exit(void)
1da177e4 6855{
aef7d97c 6856 debugfs_remove(l2cap_debugfs);
bb58f747 6857 l2cap_cleanup_sockets();
1da177e4
LT		 6858}
6859
d1c4a17d
GP		 6860module_param(disable_ertm, bool, 0644);
6861MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux 6.x block layer and io_uring tree(s)