projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Bluetooth: Fix CID initialization for fixed channels
[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"
18722c24 43#include "6lowpan.h"
1da177e4 44
d1de6d46 45bool disable_ertm;
f0709e03 46
547d1032 47static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
d40bffbc 48static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, };
1da177e4 49
b5ad8b7f
JB		 50static LIST_HEAD(chan_list);
51static DEFINE_RWLOCK(chan_list_lock);
1da177e4 52
f15b8ecf
JH		 53static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
54static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
55
1da177e4 56static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2d792818 57 u8 code, u8 ident, u16 dlen, void *data);
4519de9a 58static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
2d792818 59 void *data);
710f9b0a 60static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
5e4e3972 61static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
1da177e4 62
d660366d 63static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2d792818 64 struct sk_buff_head *skbs, u8 event);
608bcc6d 65
4f1654e0
MH		 66static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
67{
68 if (hcon->type == LE_LINK) {
69 if (type == ADDR_LE_DEV_PUBLIC)
70 return BDADDR_LE_PUBLIC;
71 else
72 return BDADDR_LE_RANDOM;
73 }
74
75 return BDADDR_BREDR;
76}
77
0139418c 78/* ---- L2CAP channels ---- */
71ba0e56 79
2d792818
GP		 80static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
81 u16 cid)
0139418c 82{
3df91ea2 83 struct l2cap_chan *c;
3d57dc68 84
3df91ea2
AE		 85 list_for_each_entry(c, &conn->chan_l, list) {
86 if (c->dcid == cid)
87 return c;
0139418c 88 }
3df91ea2 89 return NULL;
0139418c
MH		 90}
91
2d792818
GP		 92static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
93 u16 cid)
0139418c 94{
3df91ea2 95 struct l2cap_chan *c;
3d57dc68 96
3df91ea2
AE		 97 list_for_each_entry(c, &conn->chan_l, list) {
98 if (c->scid == cid)
99 return c;
0139418c 100 }
3df91ea2 101 return NULL;
0139418c
MH		 102}
103
104/* Find channel with given SCID.
ef191ade 105 * Returns locked channel. */
2d792818
GP		 106static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
107 u16 cid)
0139418c 108{
48454079 109 struct l2cap_chan *c;
baa7e1fa 110
3df91ea2 111 mutex_lock(&conn->chan_lock);
baa7e1fa 112 c = __l2cap_get_chan_by_scid(conn, cid);
ef191ade
MM		 113 if (c)
114 l2cap_chan_lock(c);
3df91ea2
AE		 115 mutex_unlock(&conn->chan_lock);
116
48454079 117 return c;
0139418c
MH		 118}
119
b1a130b7
MM		 120/* Find channel with given DCID.
121 * Returns locked channel.
122 */
123static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
124 u16 cid)
125{
126 struct l2cap_chan *c;
127
128 mutex_lock(&conn->chan_lock);
129 c = __l2cap_get_chan_by_dcid(conn, cid);
130 if (c)
131 l2cap_chan_lock(c);
132 mutex_unlock(&conn->chan_lock);
133
134 return c;
135}
136
2d792818
GP		 137static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
138 u8 ident)
0139418c 139{
3df91ea2 140 struct l2cap_chan *c;
3d57dc68 141
3df91ea2
AE		 142 list_for_each_entry(c, &conn->chan_l, list) {
143 if (c->ident == ident)
144 return c;
0139418c 145 }
3df91ea2 146 return NULL;
0139418c
MH		 147}
148
5b155ef9
MM		 149static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
150 u8 ident)
151{
152 struct l2cap_chan *c;
153
154 mutex_lock(&conn->chan_lock);
155 c = __l2cap_get_chan_by_ident(conn, ident);
156 if (c)
157 l2cap_chan_lock(c);
158 mutex_unlock(&conn->chan_lock);
159
160 return c;
161}
162
23691d75 163static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 164{
23691d75 165 struct l2cap_chan *c;
9e4425ff 166
23691d75 167 list_for_each_entry(c, &chan_list, global_l) {
7eafc59e 168 if (c->sport == psm && !bacmp(&c->src, src))
250938cb 169 return c;
9e4425ff 170 }
250938cb 171 return NULL;
9e4425ff
GP		 172}
173
174int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
175{
73b2ec18
GP		 176 int err;
177
333055f2 178 write_lock(&chan_list_lock);
9e4425ff 179
23691d75 180 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 181 err = -EADDRINUSE;
182 goto done;
9e4425ff
GP		 183 }
184
73b2ec18
GP		 185 if (psm) {
186 chan->psm = psm;
187 chan->sport = psm;
188 err = 0;
189 } else {
190 u16 p;
191
192 err = -EINVAL;
193 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 194 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 195 chan->psm = cpu_to_le16(p);
196 chan->sport = cpu_to_le16(p);
197 err = 0;
198 break;
199 }
200 }
9e4425ff 201
73b2ec18 202done:
333055f2 203 write_unlock(&chan_list_lock);
73b2ec18 204 return err;
9e4425ff
GP		 205}
206
207int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
208{
333055f2 209 write_lock(&chan_list_lock);
9e4425ff
GP		 210
211 chan->scid = scid;
212
333055f2 213 write_unlock(&chan_list_lock);
9e4425ff
GP		 214
215 return 0;
216}
217
baa7e1fa 218static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 219{
e77af755 220 u16 cid, dyn_end;
0139418c 221
e77af755
JH		 222 if (conn->hcon->type == LE_LINK)
223 dyn_end = L2CAP_CID_LE_DYN_END;
224 else
225 dyn_end = L2CAP_CID_DYN_END;
226
227 for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) {
baa7e1fa 228 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 229 return cid;
230 }
231
232 return 0;
233}
234
f93fa273 235static void l2cap_state_change(struct l2cap_chan *chan, int state)
89bc500e 236{
42d2d87c 237 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
2d792818 238 state_to_string(state));
badaaa00 239
89bc500e 240 chan->state = state;
53f52121 241 chan->ops->state_change(chan, state, 0);
89bc500e
GP		 242}
243
f8e73017
GP		 244static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
245 int state, int err)
2e0052e4 246{
f8e73017 247 chan->state = state;
53f52121 248 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 249}
250
251static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
252{
f8e73017 253 chan->ops->state_change(chan, chan->state, err);
2e0052e4
AE		 254}
255
4239d16f
MM		 256static void __set_retrans_timer(struct l2cap_chan *chan)
257{
258 if (!delayed_work_pending(&chan->monitor_timer) &&
259 chan->retrans_timeout) {
260 l2cap_set_timer(chan, &chan->retrans_timer,
261 msecs_to_jiffies(chan->retrans_timeout));
262 }
263}
264
265static void __set_monitor_timer(struct l2cap_chan *chan)
266{
267 __clear_retrans_timer(chan);
268 if (chan->monitor_timeout) {
269 l2cap_set_timer(chan, &chan->monitor_timer,
270 msecs_to_jiffies(chan->monitor_timeout));
271 }
272}
273
608bcc6d
MM		 274static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
275 u16 seq)
276{
277 struct sk_buff *skb;
278
279 skb_queue_walk(head, skb) {
280 if (bt_cb(skb)->control.txseq == seq)
281 return skb;
282 }
283
284 return NULL;
285}
286
3c588192
MM		 287/* ---- L2CAP sequence number lists ---- */
288
289/* For ERTM, ordered lists of sequence numbers must be tracked for
290 * SREJ requests that are received and for frames that are to be
291 * retransmitted. These seq_list functions implement a singly-linked
292 * list in an array, where membership in the list can also be checked
293 * in constant time. Items can also be added to the tail of the list
294 * and removed from the head in constant time, without further memory
295 * allocs or frees.
296 */
297
298static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
299{
300 size_t alloc_size, i;
301
302 /* Allocated size is a power of 2 to map sequence numbers
303 * (which may be up to 14 bits) in to a smaller array that is
304 * sized for the negotiated ERTM transmit windows.
305 */
306 alloc_size = roundup_pow_of_two(size);
307
308 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
309 if (!seq_list->list)
310 return -ENOMEM;
311
312 seq_list->mask = alloc_size - 1;
313 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
314 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
315 for (i = 0; i < alloc_size; i++)
316 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
317
318 return 0;
319}
320
321static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
322{
323 kfree(seq_list->list);
324}
325
326static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
327 u16 seq)
328{
329 /* Constant-time check for list membership */
330 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
331}
332
03a0c5d6 333static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
3c588192 334{
03a0c5d6 335 u16 seq = seq_list->head;
3c588192
MM		 336 u16 mask = seq_list->mask;
337
03a0c5d6
JH		 338 seq_list->head = seq_list->list[seq & mask];
339 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
340
341 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
342 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
343 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192 344 }
3c588192 345
03a0c5d6 346 return seq;
3c588192
MM		 347}
348
349static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
350{
f522ae36 351 u16 i;
3c588192 352
f522ae36
GP		 353 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
354 return;
355
356 for (i = 0; i <= seq_list->mask; i++)
357 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
358
359 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
360 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 361}
362
363static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
364{
365 u16 mask = seq_list->mask;
366
367 /* All appends happen in constant time */
368
f522ae36
GP		 369 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
370 return;
3c588192 371
f522ae36
GP		 372 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
373 seq_list->head = seq;
374 else
375 seq_list->list[seq_list->tail & mask] = seq;
376
377 seq_list->tail = seq;
378 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 379}
380
721c4181 381static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 382{
721c4181 383 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 384 chan_timer.work);
3df91ea2 385 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 386 int reason;
387
e05dcc32 388 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 389
3df91ea2 390 mutex_lock(&conn->chan_lock);
6be36555 391 l2cap_chan_lock(chan);
ab07801d 392
89bc500e 393 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 394 reason = ECONNREFUSED;
89bc500e 395 else if (chan->state == BT_CONNECT &&
2d792818 396 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 397 reason = ECONNREFUSED;
398 else
399 reason = ETIMEDOUT;
400
0f852724 401 l2cap_chan_close(chan, reason);
ab07801d 402
6be36555 403 l2cap_chan_unlock(chan);
ab07801d 404
80b98027 405 chan->ops->close(chan);
3df91ea2
AE		 406 mutex_unlock(&conn->chan_lock);
407
371fd835 408 l2cap_chan_put(chan);
ab07801d
GP		 409}
410
eef1d9b6 411struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 412{
413 struct l2cap_chan *chan;
414
415 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
416 if (!chan)
417 return NULL;
418
c03b355e
AE		 419 mutex_init(&chan->lock);
420
333055f2 421 write_lock(&chan_list_lock);
23691d75 422 list_add(&chan->global_l, &chan_list);
333055f2 423 write_unlock(&chan_list_lock);
23691d75 424
721c4181 425 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 426
89bc500e
GP		 427 chan->state = BT_OPEN;
428
144ad330 429 kref_init(&chan->kref);
71ba0e56 430
2827011f
MM		 431 /* This flag is cleared in l2cap_chan_ready() */
432 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
433
eef1d9b6 434 BT_DBG("chan %p", chan);
abc545b8 435
48454079
GP		 436 return chan;
437}
438
144ad330 439static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 440{
144ad330
SS		 441 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
442
4af66c69
JK		 443 BT_DBG("chan %p", chan);
444
333055f2 445 write_lock(&chan_list_lock);
23691d75 446 list_del(&chan->global_l);
333055f2 447 write_unlock(&chan_list_lock);
23691d75 448
4af66c69 449 kfree(chan);
6ff5abbf
GP		 450}
451
30648372
JK		 452void l2cap_chan_hold(struct l2cap_chan *c)
453{
144ad330 454 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 455
144ad330 456 kref_get(&c->kref);
30648372
JK		 457}
458
459void l2cap_chan_put(struct l2cap_chan *c)
460{
144ad330 461 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 462
144ad330 463 kref_put(&c->kref, l2cap_chan_destroy);
30648372
JK		 464}
465
bd4b1653
AE		 466void l2cap_chan_set_defaults(struct l2cap_chan *chan)
467{
468 chan->fcs = L2CAP_FCS_CRC16;
469 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
470 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
471 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
c20f8e35 472 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653
AE		 473 chan->sec_level = BT_SECURITY_LOW;
474
475 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
476}
477
0ce43ce6 478static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 479{
0ce43ce6
JH		 480 chan->sdu = NULL;
481 chan->sdu_last_frag = NULL;
482 chan->sdu_len = 0;
0cd75f7e 483 chan->tx_credits = 0;
f15b8ecf 484 chan->rx_credits = le_max_credits;
f1324ea5 485 chan->mps = min_t(u16, chan->imtu, L2CAP_LE_DEFAULT_MPS);
0ce43ce6
JH		 486
487 skb_queue_head_init(&chan->tx_q);
38319713
JH		 488}
489
93c3e8f5 490void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 491{
af05b30b 492 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 493 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 494
9f5a0d7b 495 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 496
8c1d787b 497 chan->conn = conn;
0139418c 498
5491120e
AE		 499 switch (chan->chan_type) {
500 case L2CAP_CHAN_CONN_ORIENTED:
21626e62
JH		 501 /* Alloc CID for connection-oriented socket */
502 chan->scid = l2cap_alloc_cid(conn);
503 if (conn->hcon->type == ACL_LINK)
0c1bc5c6 504 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 505 break;
506
507 case L2CAP_CHAN_CONN_LESS:
0139418c 508 /* Connectionless socket */
fe4128e0
GP		 509 chan->scid = L2CAP_CID_CONN_LESS;
510 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 511 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 512 break;
513
2338a7e0
JH		 514 case L2CAP_CHAN_FIXED:
515 /* Caller will set CID and CID specific MTU values */
416fa752
AE		 516 break;
517
5491120e 518 default:
0139418c 519 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 520 chan->scid = L2CAP_CID_SIGNALING;
521 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 522 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 523 }
524
8f7975b1
AE		 525 chan->local_id = L2CAP_BESTEFFORT_ID;
526 chan->local_stype = L2CAP_SERV_BESTEFFORT;
527 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
528 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
529 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 530 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 531
371fd835 532 l2cap_chan_hold(chan);
baa7e1fa 533
5ee9891d
JH		 534 hci_conn_hold(conn->hcon);
535
3df91ea2 536 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 537}
538
466f8004 539void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 540{
541 mutex_lock(&conn->chan_lock);
542 __l2cap_chan_add(conn, chan);
3df91ea2 543 mutex_unlock(&conn->chan_lock);
0139418c
MH		 544}
545
466f8004 546void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 547{
8c1d787b 548 struct l2cap_conn *conn = chan->conn;
0139418c 549
c9b66675 550 __clear_chan_timer(chan);
0139418c 551
49208c9c 552 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 553
8e87d142 554 if (conn) {
56f60984 555 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 556 /* Delete from channel list */
3df91ea2 557 list_del(&chan->list);
3d57dc68 558
371fd835 559 l2cap_chan_put(chan);
baa7e1fa 560
8c1d787b 561 chan->conn = NULL;
3cabbfda 562
2338a7e0 563 if (chan->scid != L2CAP_CID_A2MP)
76a68ba0 564 hci_conn_drop(conn->hcon);
56f60984
AE		 565
566 if (mgr && mgr->bredr_chan == chan)
567 mgr->bredr_chan = NULL;
0139418c
MH		 568 }
569
419e08c1
AE		 570 if (chan->hs_hchan) {
571 struct hci_chan *hs_hchan = chan->hs_hchan;
572
573 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
574 amp_disconnect_logical_link(hs_hchan);
575 }
576
b699ec0d 577 chan->ops->teardown(chan, err);
6be36555 578
2827011f 579 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 580 return;
2ead70b8 581
ee556f66
GP		 582 switch(chan->mode) {
583 case L2CAP_MODE_BASIC:
584 break;
c13ffa62 585
38319713 586 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 587 skb_queue_purge(&chan->tx_q);
38319713
JH		 588 break;
589
ee556f66 590 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 591 __clear_retrans_timer(chan);
592 __clear_monitor_timer(chan);
593 __clear_ack_timer(chan);
c13ffa62 594
f1c6775b 595 skb_queue_purge(&chan->srej_q);
c13ffa62 596
3c588192
MM		 597 l2cap_seq_list_free(&chan->srej_list);
598 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 599
600 /* fall through */
601
602 case L2CAP_MODE_STREAMING:
603 skb_queue_purge(&chan->tx_q);
604 break;
c13ffa62 605 }
ee556f66
GP		 606
607 return;
0139418c
MH		 608}
609
27e2d4c8
JH		 610static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
611{
612 struct l2cap_conn *conn = chan->conn;
613 struct l2cap_le_conn_rsp rsp;
614 u16 result;
615
616 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
617 result = L2CAP_CR_AUTHORIZATION;
618 else
619 result = L2CAP_CR_BAD_PSM;
620
621 l2cap_state_change(chan, BT_DISCONN);
622
623 rsp.dcid = cpu_to_le16(chan->scid);
624 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 625 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 626 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 627 rsp.result = cpu_to_le16(result);
628
629 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
630 &rsp);
631}
632
791d60f7
JH		 633static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
634{
635 struct l2cap_conn *conn = chan->conn;
636 struct l2cap_conn_rsp rsp;
637 u16 result;
638
639 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
640 result = L2CAP_CR_SEC_BLOCK;
641 else
642 result = L2CAP_CR_BAD_PSM;
643
644 l2cap_state_change(chan, BT_DISCONN);
645
646 rsp.scid = cpu_to_le16(chan->dcid);
647 rsp.dcid = cpu_to_le16(chan->scid);
648 rsp.result = cpu_to_le16(result);
649 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
650
651 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
652}
653
0f852724 654void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 655{
656 struct l2cap_conn *conn = chan->conn;
4519de9a 657
7eafc59e 658 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 659
89bc500e 660 switch (chan->state) {
4519de9a 661 case BT_LISTEN:
b699ec0d 662 chan->ops->teardown(chan, 0);
4519de9a
GP		 663 break;
664
665 case BT_CONNECTED:
666 case BT_CONFIG:
cea04ce3
JH		 667 /* ATT uses L2CAP_CHAN_CONN_ORIENTED so we must also
668 * check for chan->psm.
669 */
670 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && chan->psm) {
8d836d71 671 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 672 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 673 } else
674 l2cap_chan_del(chan, reason);
675 break;
676
677 case BT_CONNECT2:
791d60f7
JH		 678 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
679 if (conn->hcon->type == ACL_LINK)
680 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 681 else if (conn->hcon->type == LE_LINK)
682 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 683 }
684
685 l2cap_chan_del(chan, reason);
686 break;
687
688 case BT_CONNECT:
689 case BT_DISCONN:
690 l2cap_chan_del(chan, reason);
691 break;
692
693 default:
b699ec0d 694 chan->ops->teardown(chan, 0);
4519de9a
GP		 695 break;
696 }
697}
698
4343478f 699static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 700{
6a974b50
MH		 701 switch (chan->chan_type) {
702 case L2CAP_CHAN_RAW:
4343478f 703 switch (chan->sec_level) {
8556edd3 704 case BT_SECURITY_HIGH:
7d513e92 705 case BT_SECURITY_FIPS:
8556edd3
JH		 706 return HCI_AT_DEDICATED_BONDING_MITM;
707 case BT_SECURITY_MEDIUM:
708 return HCI_AT_DEDICATED_BONDING;
709 default:
710 return HCI_AT_NO_BONDING;
711 }
6a974b50 712 break;
3124b843
MH		 713 case L2CAP_CHAN_CONN_LESS:
714 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) {
715 if (chan->sec_level == BT_SECURITY_LOW)
716 chan->sec_level = BT_SECURITY_SDP;
717 }
7d513e92
MH		 718 if (chan->sec_level == BT_SECURITY_HIGH ||
719 chan->sec_level == BT_SECURITY_FIPS)
3124b843
MH		 720 return HCI_AT_NO_BONDING_MITM;
721 else
722 return HCI_AT_NO_BONDING;
723 break;
6a974b50
MH		 724 case L2CAP_CHAN_CONN_ORIENTED:
725 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
726 if (chan->sec_level == BT_SECURITY_LOW)
727 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 728
7d513e92
MH		 729 if (chan->sec_level == BT_SECURITY_HIGH ||
730 chan->sec_level == BT_SECURITY_FIPS)
6a974b50
MH		 731 return HCI_AT_NO_BONDING_MITM;
732 else
733 return HCI_AT_NO_BONDING;
734 }
735 /* fall through */
736 default:
4343478f 737 switch (chan->sec_level) {
00ae4af9 738 case BT_SECURITY_HIGH:
7d513e92 739 case BT_SECURITY_FIPS:
8556edd3 740 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 741 case BT_SECURITY_MEDIUM:
8556edd3 742 return HCI_AT_GENERAL_BONDING;
00ae4af9 743 default:
8556edd3 744 return HCI_AT_NO_BONDING;
00ae4af9 745 }
6a974b50 746 break;
0684e5f9 747 }
8556edd3
JH		 748}
749
750/* Service level security */
d45fc423 751int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 752{
8c1d787b 753 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 754 __u8 auth_type;
755
a17de2fe
JH		 756 if (conn->hcon->type == LE_LINK)
757 return smp_conn_security(conn->hcon, chan->sec_level);
758
4343478f 759 auth_type = l2cap_get_auth_type(chan);
79d554a6 760
4343478f 761 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 762}
763
b5ad8b7f 764static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 765{
766 u8 id;
767
768 /* Get next available identificator.
769 * 1 - 128 are used by kernel.
770 * 129 - 199 are reserved.
771 * 200 - 254 are used by utilities like l2ping, etc.
772 */
773
333055f2 774 spin_lock(&conn->lock);
4e8402a3
MH		 775
776 if (++conn->tx_ident > 128)
777 conn->tx_ident = 1;
778
779 id = conn->tx_ident;
780
333055f2 781 spin_unlock(&conn->lock);
4e8402a3
MH		 782
783 return id;
784}
785
2d792818
GP		 786static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
787 void *data)
4e8402a3
MH		 788{
789 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 790 u8 flags;
4e8402a3
MH		 791
792 BT_DBG("code 0x%2.2x", code);
793
794 if (!skb)
9a9c6a34 795 return;
4e8402a3 796
e702112f
AE		 797 if (lmp_no_flush_capable(conn->hcon->hdev))
798 flags = ACL_START_NO_FLUSH;
799 else
800 flags = ACL_START;
801
14b12d0b 802 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 803 skb->priority = HCI_PRIO_MAX;
14b12d0b 804
73d80deb
LAD		 805 hci_send_acl(conn->hchan, skb, flags);
806}
807
02b0fbb9
MM		 808static bool __chan_is_moving(struct l2cap_chan *chan)
809{
810 return chan->move_state != L2CAP_MOVE_STABLE &&
811 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
812}
813
73d80deb
LAD		 814static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
815{
816 struct hci_conn *hcon = chan->conn->hcon;
817 u16 flags;
818
819 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 820 skb->priority);
73d80deb 821
d5f8a75d
MM		 822 if (chan->hs_hcon && !__chan_is_moving(chan)) {
823 if (chan->hs_hchan)
824 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
825 else
826 kfree_skb(skb);
827
828 return;
829 }
830
73d80deb 831 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 832 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 833 flags = ACL_START_NO_FLUSH;
834 else
835 flags = ACL_START;
14b12d0b 836
73d80deb
LAD		 837 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
838 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 839}
840
b76bbd66
MM		 841static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
842{
843 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
844 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
845
846 if (enh & L2CAP_CTRL_FRAME_TYPE) {
847 /* S-Frame */
848 control->sframe = 1;
849 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
850 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
851
852 control->sar = 0;
853 control->txseq = 0;
854 } else {
855 /* I-Frame */
856 control->sframe = 0;
857 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
858 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
859
860 control->poll = 0;
861 control->super = 0;
862 }
863}
864
b76bbd66
MM		 865static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
866{
867 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
868 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
869
870 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
871 /* S-Frame */
872 control->sframe = 1;
873 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
874 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
875
876 control->sar = 0;
877 control->txseq = 0;
878 } else {
879 /* I-Frame */
880 control->sframe = 0;
881 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
882 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
883
884 control->poll = 0;
885 control->super = 0;
886 }
887}
888
889static inline void __unpack_control(struct l2cap_chan *chan,
890 struct sk_buff *skb)
891{
892 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
893 __unpack_extended_control(get_unaligned_le32(skb->data),
894 &bt_cb(skb)->control);
cec8ab6e 895 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 896 } else {
897 __unpack_enhanced_control(get_unaligned_le16(skb->data),
898 &bt_cb(skb)->control);
cec8ab6e 899 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 900 }
901}
902
b5c6aaed
MM		 903static u32 __pack_extended_control(struct l2cap_ctrl *control)
904{
905 u32 packed;
906
907 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
908 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
909
910 if (control->sframe) {
911 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
912 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
913 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
914 } else {
915 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
916 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
917 }
918
919 return packed;
920}
921
922static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
923{
924 u16 packed;
925
926 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
927 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
928
929 if (control->sframe) {
930 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
931 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
932 packed |= L2CAP_CTRL_FRAME_TYPE;
933 } else {
934 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
935 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
936 }
937
938 return packed;
939}
940
b76bbd66
MM		 941static inline void __pack_control(struct l2cap_chan *chan,
942 struct l2cap_ctrl *control,
943 struct sk_buff *skb)
944{
945 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
946 put_unaligned_le32(__pack_extended_control(control),
947 skb->data + L2CAP_HDR_SIZE);
948 } else {
949 put_unaligned_le16(__pack_enhanced_control(control),
950 skb->data + L2CAP_HDR_SIZE);
951 }
952}
953
ba7aa64f
GP		 954static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
955{
956 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
957 return L2CAP_EXT_HDR_SIZE;
958 else
959 return L2CAP_ENH_HDR_SIZE;
960}
961
a67d7f6f
MM		 962static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
963 u32 control)
b5c6aaed
MM		 964{
965 struct sk_buff *skb;
966 struct l2cap_hdr *lh;
ba7aa64f 967 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 968
969 if (chan->fcs == L2CAP_FCS_CRC16)
970 hlen += L2CAP_FCS_SIZE;
971
a67d7f6f 972 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 973
b5c6aaed 974 if (!skb)
a67d7f6f 975 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 976
977 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
978 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
979 lh->cid = cpu_to_le16(chan->dcid);
980
a67d7f6f
MM		 981 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
982 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
983 else
984 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 985
986 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 987 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 988 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
989 }
990
991 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 992 return skb;
993}
994
995static void l2cap_send_sframe(struct l2cap_chan *chan,
996 struct l2cap_ctrl *control)
997{
998 struct sk_buff *skb;
999 u32 control_field;
1000
1001 BT_DBG("chan %p, control %p", chan, control);
1002
1003 if (!control->sframe)
1004 return;
1005
b99e13ad
MM		 1006 if (__chan_is_moving(chan))
1007 return;
1008
a67d7f6f
MM		 1009 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1010 !control->poll)
1011 control->final = 1;
1012
1013 if (control->super == L2CAP_SUPER_RR)
1014 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1015 else if (control->super == L2CAP_SUPER_RNR)
1016 set_bit(CONN_RNR_SENT, &chan->conn_state);
1017
1018 if (control->super != L2CAP_SUPER_SREJ) {
1019 chan->last_acked_seq = control->reqseq;
1020 __clear_ack_timer(chan);
1021 }
1022
1023 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1024 control->final, control->poll, control->super);
1025
1026 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1027 control_field = __pack_extended_control(control);
1028 else
1029 control_field = __pack_enhanced_control(control);
1030
1031 skb = l2cap_create_sframe_pdu(chan, control_field);
1032 if (!IS_ERR(skb))
1033 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1034}
1035
c9e3d5e0 1036static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1037{
c9e3d5e0
MM		 1038 struct l2cap_ctrl control;
1039
1040 BT_DBG("chan %p, poll %d", chan, poll);
1041
1042 memset(&control, 0, sizeof(control));
1043 control.sframe = 1;
1044 control.poll = poll;
1045
1046 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1047 control.super = L2CAP_SUPER_RNR;
1048 else
1049 control.super = L2CAP_SUPER_RR;
b5c6aaed 1050
c9e3d5e0
MM		 1051 control.reqseq = chan->buffer_seq;
1052 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1053}
1054
b4450035 1055static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1056{
c1360a1c 1057 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1058}
1059
1df7b17a 1060static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1061{
1df7b17a 1062 struct l2cap_conn *conn = chan->conn;
80d58d0b 1063 struct hci_dev *hdev;
1df7b17a
MH		 1064 bool amp_available = false;
1065
1066 if (!conn->hs_enabled)
1067 return false;
1068
1069 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1070 return false;
80d58d0b
MH		 1071
1072 read_lock(&hci_dev_list_lock);
1df7b17a 1073 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1074 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1075 test_bit(HCI_UP, &hdev->flags)) {
1076 amp_available = true;
1077 break;
1078 }
1079 }
80d58d0b
MH		 1080 read_unlock(&hci_dev_list_lock);
1081
1df7b17a
MH		 1082 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1083 return amp_available;
848566b3
MH		 1084
1085 return false;
93c3e8f5
AE		 1086}
1087
5ce66b59
AE		 1088static bool l2cap_check_efs(struct l2cap_chan *chan)
1089{
1090 /* Check EFS parameters */
1091 return true;
1092}
1093
2766be48 1094void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1095{
1096 struct l2cap_conn *conn = chan->conn;
1097 struct l2cap_conn_req req;
1098
1099 req.scid = cpu_to_le16(chan->scid);
1100 req.psm = chan->psm;
1101
1102 chan->ident = l2cap_get_ident(conn);
1103
1104 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1105
1106 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1107}
1108
8eb200bd
MM		 1109static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1110{
1111 struct l2cap_create_chan_req req;
1112 req.scid = cpu_to_le16(chan->scid);
1113 req.psm = chan->psm;
1114 req.amp_id = amp_id;
1115
1116 chan->ident = l2cap_get_ident(chan->conn);
1117
1118 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1119 sizeof(req), &req);
1120}
1121
02b0fbb9
MM		 1122static void l2cap_move_setup(struct l2cap_chan *chan)
1123{
1124 struct sk_buff *skb;
1125
1126 BT_DBG("chan %p", chan);
1127
1128 if (chan->mode != L2CAP_MODE_ERTM)
1129 return;
1130
1131 __clear_retrans_timer(chan);
1132 __clear_monitor_timer(chan);
1133 __clear_ack_timer(chan);
1134
1135 chan->retry_count = 0;
1136 skb_queue_walk(&chan->tx_q, skb) {
1137 if (bt_cb(skb)->control.retries)
1138 bt_cb(skb)->control.retries = 1;
1139 else
1140 break;
1141 }
1142
1143 chan->expected_tx_seq = chan->buffer_seq;
1144
1145 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1146 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1147 l2cap_seq_list_clear(&chan->retrans_list);
1148 l2cap_seq_list_clear(&chan->srej_list);
1149 skb_queue_purge(&chan->srej_q);
1150
1151 chan->tx_state = L2CAP_TX_STATE_XMIT;
1152 chan->rx_state = L2CAP_RX_STATE_MOVE;
1153
1154 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1155}
1156
5f3847a4
MM		 1157static void l2cap_move_done(struct l2cap_chan *chan)
1158{
1159 u8 move_role = chan->move_role;
1160 BT_DBG("chan %p", chan);
1161
1162 chan->move_state = L2CAP_MOVE_STABLE;
1163 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1164
1165 if (chan->mode != L2CAP_MODE_ERTM)
1166 return;
1167
1168 switch (move_role) {
1169 case L2CAP_MOVE_ROLE_INITIATOR:
1170 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1171 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1172 break;
1173 case L2CAP_MOVE_ROLE_RESPONDER:
1174 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1175 break;
1176 }
1177}
1178
9f0caeb1
VCG		 1179static void l2cap_chan_ready(struct l2cap_chan *chan)
1180{
2827011f 1181 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1182 chan->conf_state = 0;
1183 __clear_chan_timer(chan);
1184
0ce43ce6
JH		 1185 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1186 chan->ops->suspend(chan);
177f8f2b 1187
54a59aa2 1188 chan->state = BT_CONNECTED;
9f0caeb1 1189
fd83e2c2 1190 chan->ops->ready(chan);
9f0caeb1
VCG		 1191}
1192
f1496dee
JH		 1193static void l2cap_le_connect(struct l2cap_chan *chan)
1194{
1195 struct l2cap_conn *conn = chan->conn;
1196 struct l2cap_le_conn_req req;
1197
595177f3
JH		 1198 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1199 return;
1200
f1496dee
JH		 1201 req.psm = chan->psm;
1202 req.scid = cpu_to_le16(chan->scid);
1203 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1204 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1205 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1206
1207 chan->ident = l2cap_get_ident(conn);
1208
1209 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1210 sizeof(req), &req);
1211}
1212
1213static void l2cap_le_start(struct l2cap_chan *chan)
1214{
1215 struct l2cap_conn *conn = chan->conn;
1216
1217 if (!smp_conn_security(conn->hcon, chan->sec_level))
1218 return;
1219
1220 if (!chan->psm) {
1221 l2cap_chan_ready(chan);
1222 return;
1223 }
1224
1225 if (chan->state == BT_CONNECT)
1226 l2cap_le_connect(chan);
1227}
1228
93c3e8f5
AE		 1229static void l2cap_start_connection(struct l2cap_chan *chan)
1230{
1231 if (__amp_capable(chan)) {
1232 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1233 a2mp_discover_amp(chan);
f1496dee
JH		 1234 } else if (chan->conn->hcon->type == LE_LINK) {
1235 l2cap_le_start(chan);
93c3e8f5
AE		 1236 } else {
1237 l2cap_send_conn_req(chan);
1238 }
1239}
1240
fc7f8a7e 1241static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1242{
8c1d787b 1243 struct l2cap_conn *conn = chan->conn;
79d554a6 1244
9f0caeb1 1245 if (conn->hcon->type == LE_LINK) {
96ac34fb 1246 l2cap_le_start(chan);
9f0caeb1
VCG		 1247 return;
1248 }
1249
79d554a6 1250 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1251 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1252 return;
1253
d45fc423 1254 if (l2cap_chan_check_security(chan) &&
2d792818 1255 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1256 l2cap_start_connection(chan);
1257 }
79d554a6
MH		 1258 } else {
1259 struct l2cap_info_req req;
ac73498c 1260 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1261
1262 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1263 conn->info_ident = l2cap_get_ident(conn);
1264
ba13ccd9 1265 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1266
2d792818
GP		 1267 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1268 sizeof(req), &req);
79d554a6
MH		 1269 }
1270}
1271
cf6c2c0b
GP		 1272static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1273{
1274 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1275 if (!disable_ertm)
cf6c2c0b
GP		 1276 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1277
1278 switch (mode) {
1279 case L2CAP_MODE_ERTM:
1280 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1281 case L2CAP_MODE_STREAMING:
1282 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1283 default:
1284 return 0x00;
1285 }
1286}
1287
5e4e3972 1288static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1289{
5e4e3972 1290 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1291 struct l2cap_disconn_req req;
1292
c13ffa62
GP		 1293 if (!conn)
1294 return;
1295
aad3d0e3 1296 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1297 __clear_retrans_timer(chan);
1298 __clear_monitor_timer(chan);
1299 __clear_ack_timer(chan);
c13ffa62
GP		 1300 }
1301
2338a7e0 1302 if (chan->scid == L2CAP_CID_A2MP) {
d117773c 1303 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1304 return;
1305 }
1306
fe4128e0
GP		 1307 req.dcid = cpu_to_le16(chan->dcid);
1308 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1309 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1310 sizeof(req), &req);
c13ffa62 1311
f8e73017 1312 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1313}
1314
1da177e4 1315/* ---- L2CAP connections ---- */
4e8402a3
MH		 1316static void l2cap_conn_start(struct l2cap_conn *conn)
1317{
3df91ea2 1318 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1319
1320 BT_DBG("conn %p", conn);
1321
3df91ea2 1322 mutex_lock(&conn->chan_lock);
4e8402a3 1323
3df91ea2 1324 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1325 l2cap_chan_lock(chan);
4e8402a3 1326
715ec005 1327 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1328 l2cap_chan_unlock(chan);
79d554a6
MH		 1329 continue;
1330 }
1331
89bc500e 1332 if (chan->state == BT_CONNECT) {
d45fc423 1333 if (!l2cap_chan_check_security(chan) ||
2d792818 1334 !__l2cap_no_conn_pending(chan)) {
6be36555 1335 l2cap_chan_unlock(chan);
47731de7
GP		 1336 continue;
1337 }
79d554a6 1338
c1360a1c 1339 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1340 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1341 &chan->conf_state)) {
89bc500e 1342 l2cap_chan_close(chan, ECONNRESET);
6be36555 1343 l2cap_chan_unlock(chan);
47731de7 1344 continue;
b1235d79 1345 }
47731de7 1346
93c3e8f5 1347 l2cap_start_connection(chan);
47731de7 1348
89bc500e 1349 } else if (chan->state == BT_CONNECT2) {
79d554a6 1350 struct l2cap_conn_rsp rsp;
e9aeb2dd 1351 char buf[128];
fe4128e0
GP		 1352 rsp.scid = cpu_to_le16(chan->dcid);
1353 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1354
d45fc423 1355 if (l2cap_chan_check_security(chan)) {
bdc25783 1356 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
ac73498c
AE		 1357 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1358 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1359 chan->ops->defer(chan);
f66dc81f
MH		 1360
1361 } else {
acdcabf5 1362 l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1363 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1364 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1365 }
79d554a6 1366 } else {
ac73498c
AE		 1367 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1368 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1369 }
1370
fc7f8a7e 1371 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1372 sizeof(rsp), &rsp);
e9aeb2dd 1373
c1360a1c 1374 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1375 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1376 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1377 continue;
1378 }
1379
c1360a1c 1380 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1381 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1382 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1383 chan->num_conf_req++;
4e8402a3
MH		 1384 }
1385
6be36555 1386 l2cap_chan_unlock(chan);
4e8402a3
MH		 1387 }
1388
3df91ea2 1389 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1390}
1391
c2287681 1392/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1393 * Returns closest match, locked.
1394 */
d9b88702 1395static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1396 bdaddr_t *src,
1397 bdaddr_t *dst)
b62f328b 1398{
23691d75 1399 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1400
23691d75 1401 read_lock(&chan_list_lock);
b62f328b 1402
23691d75 1403 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1404 if (state && c->state != state)
b62f328b
VT		 1405 continue;
1406
23691d75 1407 if (c->scid == cid) {
c2287681
IY		 1408 int src_match, dst_match;
1409 int src_any, dst_any;
1410
b62f328b 1411 /* Exact match. */
7eafc59e
MH		 1412 src_match = !bacmp(&c->src, src);
1413 dst_match = !bacmp(&c->dst, dst);
c2287681 1414 if (src_match && dst_match) {
23691d75
GP		 1415 read_unlock(&chan_list_lock);
1416 return c;
1417 }
b62f328b
VT		 1418
1419 /* Closest match */
7eafc59e
MH		 1420 src_any = !bacmp(&c->src, BDADDR_ANY);
1421 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1422 if ((src_match && dst_any) || (src_any && dst_match) ||
1423 (src_any && dst_any))
23691d75 1424 c1 = c;
b62f328b
VT		 1425 }
1426 }
280f294f 1427
23691d75 1428 read_unlock(&chan_list_lock);
b62f328b 1429
23691d75 1430 return c1;
b62f328b
VT		 1431}
1432
1433static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1434{
cc8dba2b 1435 struct hci_conn *hcon = conn->hcon;
23691d75 1436 struct l2cap_chan *chan, *pchan;
cc8dba2b 1437 u8 dst_type;
b62f328b
VT		 1438
1439 BT_DBG("");
1440
18722c24
JR		 1441 bt_6lowpan_add_conn(conn);
1442
b62f328b 1443 /* Check if we have socket listening on cid */
073d1cf3 1444 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
cc8dba2b 1445 &hcon->src, &hcon->dst);
23691d75 1446 if (!pchan)
b62f328b
VT		 1447 return;
1448
44f3b0fb
JH		 1449 /* Client ATT sockets should override the server one */
1450 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1451 return;
1452
cc8dba2b
MH		 1453 dst_type = bdaddr_type(hcon, hcon->dst_type);
1454
1455 /* If device is blocked, do not create a channel for it */
1456 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type))
1457 return;
1458
8ffb9290 1459 l2cap_chan_lock(pchan);
62f3a2cf 1460
80b98027 1461 chan = pchan->ops->new_connection(pchan);
80808e43 1462 if (!chan)
b62f328b
VT		 1463 goto clean;
1464
cc8dba2b
MH		 1465 bacpy(&chan->src, &hcon->src);
1466 bacpy(&chan->dst, &hcon->dst);
1467 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1468 chan->dst_type = dst_type;
b62f328b 1469
44f3b0fb 1470 __l2cap_chan_add(conn, chan);
48454079 1471
b62f328b 1472clean:
8ffb9290 1473 l2cap_chan_unlock(pchan);
b62f328b
VT		 1474}
1475
4e8402a3
MH		 1476static void l2cap_conn_ready(struct l2cap_conn *conn)
1477{
48454079 1478 struct l2cap_chan *chan;
cc110922 1479 struct hci_conn *hcon = conn->hcon;
4e8402a3 1480
79d554a6 1481 BT_DBG("conn %p", conn);
4e8402a3 1482
d8729922
JH		 1483 /* For outgoing pairing which doesn't necessarily have an
1484 * associated socket (e.g. mgmt_pair_device).
1485 */
cc110922
VCG		 1486 if (hcon->out && hcon->type == LE_LINK)
1487 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1488
3df91ea2 1489 mutex_lock(&conn->chan_lock);
4e8402a3 1490
44f3b0fb
JH		 1491 if (hcon->type == LE_LINK)
1492 l2cap_le_conn_ready(conn);
1493
3df91ea2 1494 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1495
6be36555 1496 l2cap_chan_lock(chan);
4e8402a3 1497
2338a7e0 1498 if (chan->scid == L2CAP_CID_A2MP) {
416fa752
AE		 1499 l2cap_chan_unlock(chan);
1500 continue;
1501 }
1502
cc110922 1503 if (hcon->type == LE_LINK) {
f1496dee 1504 l2cap_le_start(chan);
63128451 1505 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
74e75740 1506 l2cap_chan_ready(chan);
b501d6a1 1507
1c244f79 1508 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1509 l2cap_do_start(chan);
1c244f79 1510 }
4e8402a3 1511
6be36555 1512 l2cap_chan_unlock(chan);
4e8402a3 1513 }
79d554a6 1514
3df91ea2 1515 mutex_unlock(&conn->chan_lock);
61a939c6
JH		 1516
1517 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
4e8402a3
MH		 1518}
1519
1520/* Notify sockets that we cannot guaranty reliability anymore */
1521static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1522{
48454079 1523 struct l2cap_chan *chan;
4e8402a3
MH		 1524
1525 BT_DBG("conn %p", conn);
1526
3df91ea2 1527 mutex_lock(&conn->chan_lock);
4e8402a3 1528
3df91ea2 1529 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1530 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1531 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1532 }
1533
3df91ea2 1534 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1535}
1536
f878fcad 1537static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1538{
f878fcad 1539 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1540 info_timer.work);
4e8402a3 1541
984947dc 1542 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1543 conn->info_ident = 0;
984947dc 1544
4e8402a3
MH		 1545 l2cap_conn_start(conn);
1546}
1547
2c8e1411
DH		 1548/*
1549 * l2cap_user
1550 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1551 * callback is called during registration. The ->remove callback is called
1552 * during unregistration.
1553 * An l2cap_user object can either be explicitly unregistered or when the
1554 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1555 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1556 * External modules must own a reference to the l2cap_conn object if they intend
1557 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1558 * any time if they don't.
1559 */
1560
1561int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1562{
1563 struct hci_dev *hdev = conn->hcon->hdev;
1564 int ret;
1565
1566 /* We need to check whether l2cap_conn is registered. If it is not, we
1567 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1568 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1569 * relies on the parent hci_conn object to be locked. This itself relies
1570 * on the hci_dev object to be locked. So we must lock the hci device
1571 * here, too. */
1572
1573 hci_dev_lock(hdev);
1574
1575 if (user->list.next || user->list.prev) {
1576 ret = -EINVAL;
1577 goto out_unlock;
1578 }
1579
1580 /* conn->hchan is NULL after l2cap_conn_del() was called */
1581 if (!conn->hchan) {
1582 ret = -ENODEV;
1583 goto out_unlock;
1584 }
1585
1586 ret = user->probe(conn, user);
1587 if (ret)
1588 goto out_unlock;
1589
1590 list_add(&user->list, &conn->users);
1591 ret = 0;
1592
1593out_unlock:
1594 hci_dev_unlock(hdev);
1595 return ret;
1596}
1597EXPORT_SYMBOL(l2cap_register_user);
1598
1599void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1600{
1601 struct hci_dev *hdev = conn->hcon->hdev;
1602
1603 hci_dev_lock(hdev);
1604
1605 if (!user->list.next || !user->list.prev)
1606 goto out_unlock;
1607
1608 list_del(&user->list);
1609 user->list.next = NULL;
1610 user->list.prev = NULL;
1611 user->remove(conn, user);
1612
1613out_unlock:
1614 hci_dev_unlock(hdev);
1615}
1616EXPORT_SYMBOL(l2cap_unregister_user);
1617
1618static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1619{
1620 struct l2cap_user *user;
1621
1622 while (!list_empty(&conn->users)) {
1623 user = list_first_entry(&conn->users, struct l2cap_user, list);
1624 list_del(&user->list);
1625 user->list.next = NULL;
1626 user->list.prev = NULL;
1627 user->remove(conn, user);
1628 }
1629}
1630
5d3de7df
VCG		 1631static void l2cap_conn_del(struct hci_conn *hcon, int err)
1632{
1633 struct l2cap_conn *conn = hcon->l2cap_data;
1634 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1635
1636 if (!conn)
1637 return;
1638
1639 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1640
1641 kfree_skb(conn->rx_skb);
1642
61a939c6
JH		 1643 skb_queue_purge(&conn->pending_rx);
1644 flush_work(&conn->pending_rx_work);
1645
2c8e1411
DH		 1646 l2cap_unregister_all_users(conn);
1647
3df91ea2
AE		 1648 mutex_lock(&conn->chan_lock);
1649
5d3de7df
VCG		 1650 /* Kill channels */
1651 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1652 l2cap_chan_hold(chan);
6be36555
AE		 1653 l2cap_chan_lock(chan);
1654
5d3de7df 1655 l2cap_chan_del(chan, err);
6be36555
AE		 1656
1657 l2cap_chan_unlock(chan);
1658
80b98027 1659 chan->ops->close(chan);
61d6ef3e 1660 l2cap_chan_put(chan);
5d3de7df
VCG		 1661 }
1662
3df91ea2
AE		 1663 mutex_unlock(&conn->chan_lock);
1664
73d80deb
LAD		 1665 hci_chan_del(conn->hchan);
1666
5d3de7df 1667 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1668 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1669
51a8efd7 1670 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1671 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1672 smp_chan_destroy(conn);
d26a2345 1673 }
5d3de7df
VCG		 1674
1675 hcon->l2cap_data = NULL;
9c903e37
DH		 1676 conn->hchan = NULL;
1677 l2cap_conn_put(conn);
5d3de7df
VCG		 1678}
1679
6c9d42a1 1680static void security_timeout(struct work_struct *work)
5d3de7df 1681{
6c9d42a1 1682 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1683 security_timer.work);
5d3de7df 1684
d06cc416
JH		 1685 BT_DBG("conn %p", conn);
1686
1687 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1688 smp_chan_destroy(conn);
1689 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1690 }
5d3de7df
VCG		 1691}
1692
9c903e37
DH		 1693static void l2cap_conn_free(struct kref *ref)
1694{
1695 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1696
1697 hci_conn_put(conn->hcon);
1698 kfree(conn);
1699}
1700
1701void l2cap_conn_get(struct l2cap_conn *conn)
1702{
1703 kref_get(&conn->ref);
1704}
1705EXPORT_SYMBOL(l2cap_conn_get);
1706
1707void l2cap_conn_put(struct l2cap_conn *conn)
1708{
1709 kref_put(&conn->ref, l2cap_conn_free);
1710}
1711EXPORT_SYMBOL(l2cap_conn_put);
1712
1da177e4 1713/* ---- Socket interface ---- */
1da177e4 1714
c2287681 1715/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1716 * Returns closest match.
1717 */
c2287681
IY		 1718static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1719 bdaddr_t *src,
bf20fd4e
JH		 1720 bdaddr_t *dst,
1721 u8 link_type)
1da177e4 1722{
23691d75 1723 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1724
23691d75 1725 read_lock(&chan_list_lock);
e0f0cb56 1726
23691d75 1727 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1728 if (state && c->state != state)
1da177e4
LT		 1729 continue;
1730
bf20fd4e
JH		 1731 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1732 continue;
1733
1734 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
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
721c4181 1763static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1764{
721c4181 1765 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1766 monitor_timer.work);
e90bac06 1767
525cd185 1768 BT_DBG("chan %p", chan);
0e98958d 1769
6be36555
AE		 1770 l2cap_chan_lock(chan);
1771
80909e04 1772 if (!chan->conn) {
6be36555 1773 l2cap_chan_unlock(chan);
8d7e1c7f 1774 l2cap_chan_put(chan);
e90bac06
GP		 1775 return;
1776 }
1777
401bb1f7 1778 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 1779
6be36555 1780 l2cap_chan_unlock(chan);
8d7e1c7f 1781 l2cap_chan_put(chan);
e90bac06
GP		 1782}
1783
721c4181 1784static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1785{
721c4181 1786 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 1787 retrans_timer.work);
e90bac06 1788
49208c9c 1789 BT_DBG("chan %p", chan);
0e98958d 1790
6be36555
AE		 1791 l2cap_chan_lock(chan);
1792
80909e04
MM		 1793 if (!chan->conn) {
1794 l2cap_chan_unlock(chan);
1795 l2cap_chan_put(chan);
1796 return;
1797 }
6be36555 1798
401bb1f7 1799 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 1800 l2cap_chan_unlock(chan);
8d7e1c7f 1801 l2cap_chan_put(chan);
e90bac06
GP		 1802}
1803
d660366d
GP		 1804static void l2cap_streaming_send(struct l2cap_chan *chan,
1805 struct sk_buff_head *skbs)
6840ed07 1806{
ccbb84af 1807 struct sk_buff *skb;
3733937d 1808 struct l2cap_ctrl *control;
6840ed07 1809
3733937d
MM		 1810 BT_DBG("chan %p, skbs %p", chan, skbs);
1811
b99e13ad
MM		 1812 if (__chan_is_moving(chan))
1813 return;
1814
3733937d
MM		 1815 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1816
1817 while (!skb_queue_empty(&chan->tx_q)) {
1818
1819 skb = skb_dequeue(&chan->tx_q);
1820
1821 bt_cb(skb)->control.retries = 1;
1822 control = &bt_cb(skb)->control;
1823
1824 control->reqseq = 0;
1825 control->txseq = chan->next_tx_seq;
1826
1827 __pack_control(chan, control, skb);
6840ed07 1828
47d1ec61 1829 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 1830 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1831 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1832 }
1833
4343478f 1834 l2cap_do_send(chan, skb);
6840ed07 1835
b4400672 1836 BT_DBG("Sent txseq %u", control->txseq);
3733937d 1837
836be934 1838 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 1839 chan->frames_sent++;
6840ed07 1840 }
6840ed07
GP		 1841}
1842
67c9e840 1843static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1844{
1845 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 1846 struct l2cap_ctrl *control;
1847 int sent = 0;
1848
1849 BT_DBG("chan %p", chan);
1c2acffb 1850
89bc500e 1851 if (chan->state != BT_CONNECTED)
c13ffa62 1852 return -ENOTCONN;
e90bac06 1853
94122bbe
MM		 1854 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1855 return 0;
1856
b99e13ad
MM		 1857 if (__chan_is_moving(chan))
1858 return 0;
1859
18a48e76
MM		 1860 while (chan->tx_send_head &&
1861 chan->unacked_frames < chan->remote_tx_win &&
1862 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 1863
18a48e76 1864 skb = chan->tx_send_head;
e90bac06 1865
18a48e76
MM		 1866 bt_cb(skb)->control.retries = 1;
1867 control = &bt_cb(skb)->control;
95ffa978 1868
e2ab4353 1869 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 1870 control->final = 1;
e2ab4353 1871
18a48e76
MM		 1872 control->reqseq = chan->buffer_seq;
1873 chan->last_acked_seq = chan->buffer_seq;
1874 control->txseq = chan->next_tx_seq;
1c2acffb 1875
18a48e76 1876 __pack_control(chan, control, skb);
e90bac06 1877
47d1ec61 1878 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 1879 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1880 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 1881 }
1882
18a48e76
MM		 1883 /* Clone after data has been modified. Data is assumed to be
1884 read-only (for locking purposes) on cloned sk_buffs.
1885 */
1886 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 1887
18a48e76
MM		 1888 if (!tx_skb)
1889 break;
1c2acffb 1890
18a48e76 1891 __set_retrans_timer(chan);
836be934
AE		 1892
1893 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 1894 chan->unacked_frames++;
6a026610 1895 chan->frames_sent++;
18a48e76 1896 sent++;
1c2acffb 1897
58d35f87
GP		 1898 if (skb_queue_is_last(&chan->tx_q, skb))
1899 chan->tx_send_head = NULL;
1c2acffb 1900 else
58d35f87 1901 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 1902
1903 l2cap_do_send(chan, tx_skb);
b4400672 1904 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 1905 }
1906
b4400672
AE		 1907 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1908 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 1909
1910 return sent;
9e917af1
GP		 1911}
1912
e1fbd4c1
MM		 1913static void l2cap_ertm_resend(struct l2cap_chan *chan)
1914{
1915 struct l2cap_ctrl control;
1916 struct sk_buff *skb;
1917 struct sk_buff *tx_skb;
1918 u16 seq;
1919
1920 BT_DBG("chan %p", chan);
1921
1922 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1923 return;
1924
b99e13ad
MM		 1925 if (__chan_is_moving(chan))
1926 return;
1927
e1fbd4c1
MM		 1928 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1929 seq = l2cap_seq_list_pop(&chan->retrans_list);
1930
1931 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1932 if (!skb) {
1933 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 1934 seq);
e1fbd4c1
MM		 1935 continue;
1936 }
1937
1938 bt_cb(skb)->control.retries++;
1939 control = bt_cb(skb)->control;
1940
1941 if (chan->max_tx != 0 &&
1942 bt_cb(skb)->control.retries > chan->max_tx) {
1943 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 1944 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 1945 l2cap_seq_list_clear(&chan->retrans_list);
1946 break;
1947 }
1948
1949 control.reqseq = chan->buffer_seq;
1950 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1951 control.final = 1;
1952 else
1953 control.final = 0;
1954
1955 if (skb_cloned(skb)) {
1956 /* Cloned sk_buffs are read-only, so we need a
1957 * writeable copy
1958 */
8bcde1f2 1959 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 1960 } else {
8bcde1f2 1961 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 1962 }
1963
1964 if (!tx_skb) {
1965 l2cap_seq_list_clear(&chan->retrans_list);
1966 break;
1967 }
1968
1969 /* Update skb contents */
1970 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1971 put_unaligned_le32(__pack_extended_control(&control),
1972 tx_skb->data + L2CAP_HDR_SIZE);
1973 } else {
1974 put_unaligned_le16(__pack_enhanced_control(&control),
1975 tx_skb->data + L2CAP_HDR_SIZE);
1976 }
1977
1978 if (chan->fcs == L2CAP_FCS_CRC16) {
1979 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
1980 put_unaligned_le16(fcs, skb_put(tx_skb,
1981 L2CAP_FCS_SIZE));
1982 }
1983
1984 l2cap_do_send(chan, tx_skb);
1985
1986 BT_DBG("Resent txseq %d", control.txseq);
1987
1988 chan->last_acked_seq = chan->buffer_seq;
1989 }
1990}
1991
f80842a8
MM		 1992static void l2cap_retransmit(struct l2cap_chan *chan,
1993 struct l2cap_ctrl *control)
1994{
1995 BT_DBG("chan %p, control %p", chan, control);
1996
1997 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
1998 l2cap_ertm_resend(chan);
1999}
2000
d2a7ac5d
MM		 2001static void l2cap_retransmit_all(struct l2cap_chan *chan,
2002 struct l2cap_ctrl *control)
2003{
e1fbd4c1
MM		 2004 struct sk_buff *skb;
2005
2006 BT_DBG("chan %p, control %p", chan, control);
2007
2008 if (control->poll)
2009 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2010
2011 l2cap_seq_list_clear(&chan->retrans_list);
2012
2013 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2014 return;
2015
2016 if (chan->unacked_frames) {
2017 skb_queue_walk(&chan->tx_q, skb) {
2018 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2019 skb == chan->tx_send_head)
e1fbd4c1
MM		 2020 break;
2021 }
2022
2023 skb_queue_walk_from(&chan->tx_q, skb) {
2024 if (skb == chan->tx_send_head)
2025 break;
2026
2027 l2cap_seq_list_append(&chan->retrans_list,
2028 bt_cb(skb)->control.txseq);
2029 }
2030
2031 l2cap_ertm_resend(chan);
2032 }
d2a7ac5d
MM		 2033}
2034
0a0aba42 2035static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2036{
0a0aba42
MM		 2037 struct l2cap_ctrl control;
2038 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2039 chan->last_acked_seq);
2040 int threshold;
9e917af1 2041
0a0aba42
MM		 2042 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2043 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2044
0a0aba42
MM		 2045 memset(&control, 0, sizeof(control));
2046 control.sframe = 1;
dfc909be 2047
0a0aba42
MM		 2048 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2049 chan->rx_state == L2CAP_RX_STATE_RECV) {
2050 __clear_ack_timer(chan);
2051 control.super = L2CAP_SUPER_RNR;
2052 control.reqseq = chan->buffer_seq;
2053 l2cap_send_sframe(chan, &control);
2054 } else {
2055 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2056 l2cap_ertm_send(chan);
2057 /* If any i-frames were sent, they included an ack */
2058 if (chan->buffer_seq == chan->last_acked_seq)
2059 frames_to_ack = 0;
2060 }
dfc909be 2061
c20f8e35 2062 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2063 * Calculate without mul or div
2064 */
c20f8e35 2065 threshold = chan->ack_win;
0a0aba42
MM		 2066 threshold += threshold << 1;
2067 threshold >>= 2;
2068
b4400672 2069 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2070 threshold);
2071
2072 if (frames_to_ack >= threshold) {
2073 __clear_ack_timer(chan);
2074 control.super = L2CAP_SUPER_RR;
2075 control.reqseq = chan->buffer_seq;
2076 l2cap_send_sframe(chan, &control);
2077 frames_to_ack = 0;
2078 }
1c2acffb 2079
0a0aba42
MM		 2080 if (frames_to_ack)
2081 __set_ack_timer(chan);
2082 }
b17e73bb
SJ		 2083}
2084
04124681
GP		 2085static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2086 struct msghdr *msg, int len,
2087 int count, struct sk_buff *skb)
1c2acffb 2088{
0952a57a 2089 struct l2cap_conn *conn = chan->conn;
1c2acffb 2090 struct sk_buff **frag;
90338947 2091 int sent = 0;
1da177e4 2092
59203a21 2093 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2094 return -EFAULT;
1da177e4
LT		 2095
2096 sent += count;
2097 len -= count;
2098
2099 /* Continuation fragments (no L2CAP header) */
2100 frag = &skb_shinfo(skb)->frag_list;
2101 while (len) {
fbe00700
GP		 2102 struct sk_buff *tmp;
2103
1da177e4
LT		 2104 count = min_t(unsigned int, conn->mtu, len);
2105
fbe00700
GP		 2106 tmp = chan->ops->alloc_skb(chan, count,
2107 msg->msg_flags & MSG_DONTWAIT);
2108 if (IS_ERR(tmp))
2109 return PTR_ERR(tmp);
2110
2111 *frag = tmp;
2f7719ce 2112
1c2acffb
GP		 2113 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2114 return -EFAULT;
1da177e4 2115
5e59b791
LAD		 2116 (*frag)->priority = skb->priority;
2117
1da177e4
LT		 2118 sent += count;
2119 len -= count;
2120
2d0ed3d5
GP		 2121 skb->len += (*frag)->len;
2122 skb->data_len += (*frag)->len;
2123
1da177e4
LT		 2124 frag = &(*frag)->next;
2125 }
1da177e4
LT		 2126
2127 return sent;
1c2acffb 2128}
1da177e4 2129
5e59b791 2130static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2131 struct msghdr *msg, size_t len,
2132 u32 priority)
1c2acffb 2133{
8c1d787b 2134 struct l2cap_conn *conn = chan->conn;
1c2acffb 2135 struct sk_buff *skb;
03a51213 2136 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2137 struct l2cap_hdr *lh;
2138
43b1b8df
MH		 2139 BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan,
2140 __le16_to_cpu(chan->psm), len, priority);
1c2acffb
GP		 2141
2142 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2143
2144 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2145 msg->msg_flags & MSG_DONTWAIT);
2146 if (IS_ERR(skb))
2147 return skb;
1c2acffb 2148
5e59b791
LAD		 2149 skb->priority = priority;
2150
1c2acffb
GP		 2151 /* Create L2CAP header */
2152 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2153 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2154 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2155 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2156
0952a57a 2157 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2158 if (unlikely(err < 0)) {
2159 kfree_skb(skb);
2160 return ERR_PTR(err);
2161 }
2162 return skb;
2163}
2164
5e59b791 2165static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2166 struct msghdr *msg, size_t len,
2167 u32 priority)
1c2acffb 2168{
8c1d787b 2169 struct l2cap_conn *conn = chan->conn;
1c2acffb 2170 struct sk_buff *skb;
f2ba7fae 2171 int err, count;
1c2acffb
GP		 2172 struct l2cap_hdr *lh;
2173
b4400672 2174 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2175
f2ba7fae 2176 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2177
f2ba7fae 2178 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2179 msg->msg_flags & MSG_DONTWAIT);
2180 if (IS_ERR(skb))
2181 return skb;
1c2acffb 2182
5e59b791
LAD		 2183 skb->priority = priority;
2184
1c2acffb
GP		 2185 /* Create L2CAP header */
2186 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2187 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2188 lh->len = cpu_to_le16(len);
1c2acffb 2189
0952a57a 2190 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2191 if (unlikely(err < 0)) {
2192 kfree_skb(skb);
2193 return ERR_PTR(err);
2194 }
2195 return skb;
2196}
2197
ab0ff76d 2198static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2199 struct msghdr *msg, size_t len,
2200 u16 sdulen)
1c2acffb 2201{
8c1d787b 2202 struct l2cap_conn *conn = chan->conn;
1c2acffb 2203 struct sk_buff *skb;
e4ca6d98 2204 int err, count, hlen;
1c2acffb
GP		 2205 struct l2cap_hdr *lh;
2206
b4400672 2207 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2208
0ee0d208
GP		 2209 if (!conn)
2210 return ERR_PTR(-ENOTCONN);
2211
ba7aa64f 2212 hlen = __ertm_hdr_size(chan);
e4ca6d98 2213
c74e560c 2214 if (sdulen)
03a51213 2215 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2216
47d1ec61 2217 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2218 hlen += L2CAP_FCS_SIZE;
fcc203c3 2219
1c2acffb 2220 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2221
2222 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2223 msg->msg_flags & MSG_DONTWAIT);
2224 if (IS_ERR(skb))
2225 return skb;
1c2acffb
GP		 2226
2227 /* Create L2CAP header */
2228 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2229 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2230 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2231
18a48e76
MM		 2232 /* Control header is populated later */
2233 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2234 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2235 else
2236 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2237
c74e560c 2238 if (sdulen)
03a51213 2239 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2240
0952a57a 2241 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2242 if (unlikely(err < 0)) {
2243 kfree_skb(skb);
2244 return ERR_PTR(err);
2245 }
e90bac06 2246
18a48e76 2247 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2248 bt_cb(skb)->control.retries = 0;
1c2acffb 2249 return skb;
1da177e4
LT		 2250}
2251
94122bbe
MM		 2252static int l2cap_segment_sdu(struct l2cap_chan *chan,
2253 struct sk_buff_head *seg_queue,
2254 struct msghdr *msg, size_t len)
c74e560c 2255{
c74e560c 2256 struct sk_buff *skb;
94122bbe
MM		 2257 u16 sdu_len;
2258 size_t pdu_len;
94122bbe 2259 u8 sar;
c74e560c 2260
b4400672 2261 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2262
94122bbe
MM		 2263 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2264 * so fragmented skbs are not used. The HCI layer's handling
2265 * of fragmented skbs is not compatible with ERTM's queueing.
2266 */
c74e560c 2267
94122bbe
MM		 2268 /* PDU size is derived from the HCI MTU */
2269 pdu_len = chan->conn->mtu;
c74e560c 2270
a549574d
MM		 2271 /* Constrain PDU size for BR/EDR connections */
2272 if (!chan->hs_hcon)
2273 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2274
2275 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2276 if (chan->fcs)
2277 pdu_len -= L2CAP_FCS_SIZE;
2278
ba7aa64f 2279 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2280
2281 /* Remote device may have requested smaller PDUs */
2282 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2283
2284 if (len <= pdu_len) {
2285 sar = L2CAP_SAR_UNSEGMENTED;
2286 sdu_len = 0;
2287 pdu_len = len;
2288 } else {
2289 sar = L2CAP_SAR_START;
2290 sdu_len = len;
2291 pdu_len -= L2CAP_SDULEN_SIZE;
2292 }
2293
2294 while (len > 0) {
2295 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2296
c74e560c 2297 if (IS_ERR(skb)) {
94122bbe 2298 __skb_queue_purge(seg_queue);
c74e560c
GP		 2299 return PTR_ERR(skb);
2300 }
2301
94122bbe
MM		 2302 bt_cb(skb)->control.sar = sar;
2303 __skb_queue_tail(seg_queue, skb);
2304
2305 len -= pdu_len;
2306 if (sdu_len) {
2307 sdu_len = 0;
2308 pdu_len += L2CAP_SDULEN_SIZE;
2309 }
2310
2311 if (len <= pdu_len) {
2312 sar = L2CAP_SAR_END;
2313 pdu_len = len;
2314 } else {
2315 sar = L2CAP_SAR_CONTINUE;
2316 }
c74e560c 2317 }
c74e560c 2318
f0f62799 2319 return 0;
c74e560c
GP		 2320}
2321
177f8f2b
JH		 2322static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2323 struct msghdr *msg,
2324 size_t len, u16 sdulen)
2325{
2326 struct l2cap_conn *conn = chan->conn;
2327 struct sk_buff *skb;
2328 int err, count, hlen;
2329 struct l2cap_hdr *lh;
2330
2331 BT_DBG("chan %p len %zu", chan, len);
2332
2333 if (!conn)
2334 return ERR_PTR(-ENOTCONN);
2335
2336 hlen = L2CAP_HDR_SIZE;
2337
2338 if (sdulen)
2339 hlen += L2CAP_SDULEN_SIZE;
2340
2341 count = min_t(unsigned int, (conn->mtu - hlen), len);
2342
2343 skb = chan->ops->alloc_skb(chan, count + hlen,
2344 msg->msg_flags & MSG_DONTWAIT);
2345 if (IS_ERR(skb))
2346 return skb;
2347
2348 /* Create L2CAP header */
2349 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2350 lh->cid = cpu_to_le16(chan->dcid);
2351 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2352
2353 if (sdulen)
2354 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2355
2356 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2357 if (unlikely(err < 0)) {
2358 kfree_skb(skb);
2359 return ERR_PTR(err);
2360 }
2361
2362 return skb;
2363}
2364
2365static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2366 struct sk_buff_head *seg_queue,
2367 struct msghdr *msg, size_t len)
2368{
2369 struct sk_buff *skb;
2370 size_t pdu_len;
2371 u16 sdu_len;
2372
2373 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2374
2375 pdu_len = chan->conn->mtu - L2CAP_HDR_SIZE;
2376
2377 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2378
2379 sdu_len = len;
2380 pdu_len -= L2CAP_SDULEN_SIZE;
2381
2382 while (len > 0) {
2383 if (len <= pdu_len)
2384 pdu_len = len;
2385
2386 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2387 if (IS_ERR(skb)) {
2388 __skb_queue_purge(seg_queue);
2389 return PTR_ERR(skb);
2390 }
2391
2392 __skb_queue_tail(seg_queue, skb);
2393
2394 len -= pdu_len;
2395
2396 if (sdu_len) {
2397 sdu_len = 0;
2398 pdu_len += L2CAP_SDULEN_SIZE;
2399 }
2400 }
2401
2402 return 0;
2403}
2404
5e59b791 2405int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2406 u32 priority)
9a91a04a 2407{
9a91a04a 2408 struct sk_buff *skb;
9a91a04a 2409 int err;
94122bbe 2410 struct sk_buff_head seg_queue;
9a91a04a 2411
31e8ce80
SWK		 2412 if (!chan->conn)
2413 return -ENOTCONN;
2414
9a91a04a 2415 /* Connectionless channel */
715ec005 2416 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2417 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2418 if (IS_ERR(skb))
2419 return PTR_ERR(skb);
2420
2421 l2cap_do_send(chan, skb);
2422 return len;
2423 }
2424
2425 switch (chan->mode) {
38319713 2426 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2427 /* Check outgoing MTU */
2428 if (len > chan->omtu)
2429 return -EMSGSIZE;
2430
fad5fc89
JH		 2431 if (!chan->tx_credits)
2432 return -EAGAIN;
2433
177f8f2b
JH		 2434 __skb_queue_head_init(&seg_queue);
2435
2436 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2437
2438 if (chan->state != BT_CONNECTED) {
2439 __skb_queue_purge(&seg_queue);
2440 err = -ENOTCONN;
2441 }
2442
2443 if (err)
2444 return err;
2445
2446 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2447
2448 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2449 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2450 chan->tx_credits--;
2451 }
2452
2453 if (!chan->tx_credits)
2454 chan->ops->suspend(chan);
2455
2456 err = len;
2457
2458 break;
2459
fad5fc89 2460 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2461 /* Check outgoing MTU */
2462 if (len > chan->omtu)
2463 return -EMSGSIZE;
2464
2465 /* Create a basic PDU */
5e59b791 2466 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2467 if (IS_ERR(skb))
2468 return PTR_ERR(skb);
2469
2470 l2cap_do_send(chan, skb);
2471 err = len;
2472 break;
2473
2474 case L2CAP_MODE_ERTM:
2475 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2476 /* Check outgoing MTU */
2477 if (len > chan->omtu) {
2478 err = -EMSGSIZE;
2479 break;
2480 }
9a91a04a 2481
94122bbe 2482 __skb_queue_head_init(&seg_queue);
9a91a04a 2483
94122bbe
MM		 2484 /* Do segmentation before calling in to the state machine,
2485 * since it's possible to block while waiting for memory
2486 * allocation.
2487 */
2488 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2489
94122bbe
MM		 2490 /* The channel could have been closed while segmenting,
2491 * check that it is still connected.
2492 */
2493 if (chan->state != BT_CONNECTED) {
2494 __skb_queue_purge(&seg_queue);
2495 err = -ENOTCONN;
9a91a04a
GP		 2496 }
2497
94122bbe 2498 if (err)
9a91a04a 2499 break;
9a91a04a 2500
3733937d 2501 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2502 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2503 else
d660366d 2504 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2505
d660366d 2506 err = len;
9a91a04a 2507
94122bbe
MM		 2508 /* If the skbs were not queued for sending, they'll still be in
2509 * seg_queue and need to be purged.
2510 */
2511 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2512 break;
2513
2514 default:
2515 BT_DBG("bad state %1.1x", chan->mode);
2516 err = -EBADFD;
2517 }
2518
2519 return err;
2520}
2521
d2a7ac5d
MM		 2522static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2523{
bed68bde
MM		 2524 struct l2cap_ctrl control;
2525 u16 seq;
2526
b4400672 2527 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2528
2529 memset(&control, 0, sizeof(control));
2530 control.sframe = 1;
2531 control.super = L2CAP_SUPER_SREJ;
2532
2533 for (seq = chan->expected_tx_seq; seq != txseq;
2534 seq = __next_seq(chan, seq)) {
2535 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2536 control.reqseq = seq;
2537 l2cap_send_sframe(chan, &control);
2538 l2cap_seq_list_append(&chan->srej_list, seq);
2539 }
2540 }
2541
2542 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2543}
2544
2545static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2546{
bed68bde
MM		 2547 struct l2cap_ctrl control;
2548
2549 BT_DBG("chan %p", chan);
2550
2551 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2552 return;
2553
2554 memset(&control, 0, sizeof(control));
2555 control.sframe = 1;
2556 control.super = L2CAP_SUPER_SREJ;
2557 control.reqseq = chan->srej_list.tail;
2558 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2559}
2560
2561static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2562{
bed68bde
MM		 2563 struct l2cap_ctrl control;
2564 u16 initial_head;
2565 u16 seq;
2566
b4400672 2567 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2568
2569 memset(&control, 0, sizeof(control));
2570 control.sframe = 1;
2571 control.super = L2CAP_SUPER_SREJ;
2572
2573 /* Capture initial list head to allow only one pass through the list. */
2574 initial_head = chan->srej_list.head;
2575
2576 do {
2577 seq = l2cap_seq_list_pop(&chan->srej_list);
2578 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2579 break;
2580
2581 control.reqseq = seq;
2582 l2cap_send_sframe(chan, &control);
2583 l2cap_seq_list_append(&chan->srej_list, seq);
2584 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2585}
2586
608bcc6d
MM		 2587static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2588{
2589 struct sk_buff *acked_skb;
2590 u16 ackseq;
2591
b4400672 2592 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2593
2594 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2595 return;
2596
b4400672 2597 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2598 chan->expected_ack_seq, chan->unacked_frames);
2599
2600 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2601 ackseq = __next_seq(chan, ackseq)) {
2602
2603 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2604 if (acked_skb) {
2605 skb_unlink(acked_skb, &chan->tx_q);
2606 kfree_skb(acked_skb);
2607 chan->unacked_frames--;
2608 }
2609 }
2610
2611 chan->expected_ack_seq = reqseq;
2612
2613 if (chan->unacked_frames == 0)
2614 __clear_retrans_timer(chan);
2615
b4400672 2616 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2617}
2618
2619static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2620{
2621 BT_DBG("chan %p", chan);
2622
2623 chan->expected_tx_seq = chan->buffer_seq;
2624 l2cap_seq_list_clear(&chan->srej_list);
2625 skb_queue_purge(&chan->srej_q);
2626 chan->rx_state = L2CAP_RX_STATE_RECV;
2627}
2628
d660366d
GP		 2629static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2630 struct l2cap_ctrl *control,
2631 struct sk_buff_head *skbs, u8 event)
608bcc6d 2632{
608bcc6d
MM		 2633 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2634 event);
2635
2636 switch (event) {
2637 case L2CAP_EV_DATA_REQUEST:
2638 if (chan->tx_send_head == NULL)
2639 chan->tx_send_head = skb_peek(skbs);
2640
2641 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2642 l2cap_ertm_send(chan);
2643 break;
2644 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2645 BT_DBG("Enter LOCAL_BUSY");
2646 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2647
2648 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2649 /* The SREJ_SENT state must be aborted if we are to
2650 * enter the LOCAL_BUSY state.
2651 */
2652 l2cap_abort_rx_srej_sent(chan);
2653 }
2654
2655 l2cap_send_ack(chan);
2656
2657 break;
2658 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2659 BT_DBG("Exit LOCAL_BUSY");
2660 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2661
2662 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2663 struct l2cap_ctrl local_control;
2664
2665 memset(&local_control, 0, sizeof(local_control));
2666 local_control.sframe = 1;
2667 local_control.super = L2CAP_SUPER_RR;
2668 local_control.poll = 1;
2669 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2670 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2671
2672 chan->retry_count = 1;
2673 __set_monitor_timer(chan);
2674 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2675 }
2676 break;
2677 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2678 l2cap_process_reqseq(chan, control->reqseq);
2679 break;
2680 case L2CAP_EV_EXPLICIT_POLL:
2681 l2cap_send_rr_or_rnr(chan, 1);
2682 chan->retry_count = 1;
2683 __set_monitor_timer(chan);
2684 __clear_ack_timer(chan);
2685 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2686 break;
2687 case L2CAP_EV_RETRANS_TO:
2688 l2cap_send_rr_or_rnr(chan, 1);
2689 chan->retry_count = 1;
2690 __set_monitor_timer(chan);
2691 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2692 break;
2693 case L2CAP_EV_RECV_FBIT:
2694 /* Nothing to process */
2695 break;
2696 default:
2697 break;
2698 }
608bcc6d
MM		 2699}
2700
d660366d
GP		 2701static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2702 struct l2cap_ctrl *control,
2703 struct sk_buff_head *skbs, u8 event)
608bcc6d 2704{
608bcc6d
MM		 2705 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2706 event);
2707
2708 switch (event) {
2709 case L2CAP_EV_DATA_REQUEST:
2710 if (chan->tx_send_head == NULL)
2711 chan->tx_send_head = skb_peek(skbs);
2712 /* Queue data, but don't send. */
2713 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2714 break;
2715 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2716 BT_DBG("Enter LOCAL_BUSY");
2717 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2718
2719 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2720 /* The SREJ_SENT state must be aborted if we are to
2721 * enter the LOCAL_BUSY state.
2722 */
2723 l2cap_abort_rx_srej_sent(chan);
2724 }
2725
2726 l2cap_send_ack(chan);
2727
2728 break;
2729 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2730 BT_DBG("Exit LOCAL_BUSY");
2731 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2732
2733 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2734 struct l2cap_ctrl local_control;
2735 memset(&local_control, 0, sizeof(local_control));
2736 local_control.sframe = 1;
2737 local_control.super = L2CAP_SUPER_RR;
2738 local_control.poll = 1;
2739 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2740 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2741
2742 chan->retry_count = 1;
2743 __set_monitor_timer(chan);
2744 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2745 }
2746 break;
2747 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2748 l2cap_process_reqseq(chan, control->reqseq);
2749
2750 /* Fall through */
2751
2752 case L2CAP_EV_RECV_FBIT:
2753 if (control && control->final) {
2754 __clear_monitor_timer(chan);
2755 if (chan->unacked_frames > 0)
2756 __set_retrans_timer(chan);
2757 chan->retry_count = 0;
2758 chan->tx_state = L2CAP_TX_STATE_XMIT;
2759 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2760 }
2761 break;
2762 case L2CAP_EV_EXPLICIT_POLL:
2763 /* Ignore */
2764 break;
2765 case L2CAP_EV_MONITOR_TO:
2766 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2767 l2cap_send_rr_or_rnr(chan, 1);
2768 __set_monitor_timer(chan);
2769 chan->retry_count++;
2770 } else {
5e4e3972 2771 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 2772 }
2773 break;
2774 default:
2775 break;
2776 }
608bcc6d
MM		 2777}
2778
d660366d
GP		 2779static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2780 struct sk_buff_head *skbs, u8 event)
608bcc6d 2781{
608bcc6d
MM		 2782 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2783 chan, control, skbs, event, chan->tx_state);
2784
2785 switch (chan->tx_state) {
2786 case L2CAP_TX_STATE_XMIT:
d660366d 2787 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 2788 break;
2789 case L2CAP_TX_STATE_WAIT_F:
d660366d 2790 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 2791 break;
2792 default:
2793 /* Ignore event */
2794 break;
2795 }
608bcc6d
MM		 2796}
2797
4b51dae9
MM		 2798static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2799 struct l2cap_ctrl *control)
2800{
2801 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2802 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 2803}
2804
f80842a8
MM		 2805static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2806 struct l2cap_ctrl *control)
2807{
2808 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 2809 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 2810}
2811
1da177e4
LT		 2812/* Copy frame to all raw sockets on that connection */
2813static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2814{
1da177e4 2815 struct sk_buff *nskb;
48454079 2816 struct l2cap_chan *chan;
1da177e4
LT		 2817
2818 BT_DBG("conn %p", conn);
2819
3df91ea2 2820 mutex_lock(&conn->chan_lock);
3d57dc68 2821
3df91ea2 2822 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 2823 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 2824 continue;
2825
7f5396a7
GP		 2826 /* Don't send frame to the channel it came from */
2827 if (bt_cb(skb)->chan == chan)
1da177e4 2828 continue;
7f5396a7 2829
8bcde1f2 2830 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 2831 if (!nskb)
1da177e4 2832 continue;
80b98027 2833 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 2834 kfree_skb(nskb);
2835 }
3d57dc68 2836
3df91ea2 2837 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 2838}
2839
2840/* ---- L2CAP signalling commands ---- */
b4400672
AE		 2841static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2842 u8 ident, u16 dlen, void *data)
1da177e4
LT		 2843{
2844 struct sk_buff *skb, **frag;
2845 struct l2cap_cmd_hdr *cmd;
2846 struct l2cap_hdr *lh;
2847 int len, count;
2848
b4400672
AE		 2849 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2850 conn, code, ident, dlen);
1da177e4 2851
300b962e
AL		 2852 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2853 return NULL;
2854
1da177e4
LT		 2855 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2856 count = min_t(unsigned int, conn->mtu, len);
2857
8bcde1f2 2858 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2859 if (!skb)
2860 return NULL;
2861
2862 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2863 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 2864
2865 if (conn->hcon->type == LE_LINK)
ac73498c 2866 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 2867 else
ac73498c 2868 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2869
2870 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2871 cmd->code = code;
2872 cmd->ident = ident;
aca3192c 2873 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2874
2875 if (dlen) {
2876 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2877 memcpy(skb_put(skb, count), data, count);
2878 data += count;
2879 }
2880
2881 len -= skb->len;
2882
2883 /* Continuation fragments (no L2CAP header) */
2884 frag = &skb_shinfo(skb)->frag_list;
2885 while (len) {
2886 count = min_t(unsigned int, conn->mtu, len);
2887
8bcde1f2 2888 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 2889 if (!*frag)
2890 goto fail;
2891
2892 memcpy(skb_put(*frag, count), data, count);
2893
2894 len -= count;
2895 data += count;
2896
2897 frag = &(*frag)->next;
2898 }
2899
2900 return skb;
2901
2902fail:
2903 kfree_skb(skb);
2904 return NULL;
2905}
2906
2d792818
GP		 2907static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2908 unsigned long *val)
1da177e4
LT		 2909{
2910 struct l2cap_conf_opt *opt = *ptr;
2911 int len;
2912
2913 len = L2CAP_CONF_OPT_SIZE + opt->len;
2914 *ptr += len;
2915
2916 *type = opt->type;
2917 *olen = opt->len;
2918
2919 switch (opt->len) {
2920 case 1:
2921 *val = *((u8 *) opt->val);
2922 break;
2923
2924 case 2:
bfaaeb3e 2925 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2926 break;
2927
2928 case 4:
bfaaeb3e 2929 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2930 break;
2931
2932 default:
2933 *val = (unsigned long) opt->val;
2934 break;
2935 }
2936
b4400672 2937 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 2938 return len;
2939}
2940
1da177e4
LT		 2941static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2942{
2943 struct l2cap_conf_opt *opt = *ptr;
2944
b4400672 2945 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 2946
2947 opt->type = type;
2948 opt->len = len;
2949
2950 switch (len) {
2951 case 1:
2952 *((u8 *) opt->val) = val;
2953 break;
2954
2955 case 2:
4f8b691c 2956 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2957 break;
2958
2959 case 4:
4f8b691c 2960 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2961 break;
2962
2963 default:
2964 memcpy(opt->val, (void *) val, len);
2965 break;
2966 }
2967
2968 *ptr += L2CAP_CONF_OPT_SIZE + len;
2969}
2970
f89cef09
AE		 2971static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2972{
2973 struct l2cap_conf_efs efs;
2974
1ec918ce 2975 switch (chan->mode) {
f89cef09
AE		 2976 case L2CAP_MODE_ERTM:
2977 efs.id = chan->local_id;
2978 efs.stype = chan->local_stype;
2979 efs.msdu = cpu_to_le16(chan->local_msdu);
2980 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 2981 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 2982 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 2983 break;
2984
2985 case L2CAP_MODE_STREAMING:
2986 efs.id = 1;
2987 efs.stype = L2CAP_SERV_BESTEFFORT;
2988 efs.msdu = cpu_to_le16(chan->local_msdu);
2989 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2990 efs.acc_lat = 0;
2991 efs.flush_to = 0;
2992 break;
2993
2994 default:
2995 return;
2996 }
2997
2998 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 2999 (unsigned long) &efs);
f89cef09
AE		 3000}
3001
721c4181 3002static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3003{
721c4181 3004 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3005 ack_timer.work);
3006 u16 frames_to_ack;
c1b4f43b 3007
2fb9b3d4
GP		 3008 BT_DBG("chan %p", chan);
3009
6be36555
AE		 3010 l2cap_chan_lock(chan);
3011
0362520b
MM		 3012 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3013 chan->last_acked_seq);
6be36555 3014
0362520b
MM		 3015 if (frames_to_ack)
3016 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3017
0362520b 3018 l2cap_chan_unlock(chan);
09bfb2ee 3019 l2cap_chan_put(chan);
c1b4f43b
GP		 3020}
3021
466f8004 3022int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3023{
3c588192
MM		 3024 int err;
3025
105bdf9e
MM		 3026 chan->next_tx_seq = 0;
3027 chan->expected_tx_seq = 0;
42e5c802 3028 chan->expected_ack_seq = 0;
6a026610 3029 chan->unacked_frames = 0;
42e5c802 3030 chan->buffer_seq = 0;
6a026610 3031 chan->frames_sent = 0;
105bdf9e
MM		 3032 chan->last_acked_seq = 0;
3033 chan->sdu = NULL;
3034 chan->sdu_last_frag = NULL;
3035 chan->sdu_len = 0;
3036
d34c34fb
MM		 3037 skb_queue_head_init(&chan->tx_q);
3038
6ed971ca
MH		 3039 chan->local_amp_id = AMP_ID_BREDR;
3040 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3041 chan->move_state = L2CAP_MOVE_STABLE;
3042 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3043
105bdf9e
MM		 3044 if (chan->mode != L2CAP_MODE_ERTM)
3045 return 0;
3046
3047 chan->rx_state = L2CAP_RX_STATE_RECV;
3048 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3049
721c4181
GP		 3050 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3051 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3052 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3053
f1c6775b 3054 skb_queue_head_init(&chan->srej_q);
1890d36b 3055
3c588192
MM		 3056 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3057 if (err < 0)
3058 return err;
3059
9dc9affc
MM		 3060 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3061 if (err < 0)
3062 l2cap_seq_list_free(&chan->srej_list);
3063
3064 return err;
0565c1c2
GP		 3065}
3066
f2fcfcd6
GP		 3067static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3068{
3069 switch (mode) {
3070 case L2CAP_MODE_STREAMING:
3071 case L2CAP_MODE_ERTM:
3072 if (l2cap_mode_supported(mode, remote_feat_mask))
3073 return mode;
3074 /* fall through */
3075 default:
3076 return L2CAP_MODE_BASIC;
3077 }
3078}
3079
848566b3 3080static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3081{
848566b3 3082 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
6327eb98
AE		 3083}
3084
848566b3 3085static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3086{
848566b3 3087 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
f89cef09
AE		 3088}
3089
36c86c85
MM		 3090static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3091 struct l2cap_conf_rfc *rfc)
3092{
6ed971ca 3093 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3094 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3095
3096 /* Class 1 devices have must have ERTM timeouts
3097 * exceeding the Link Supervision Timeout. The
3098 * default Link Supervision Timeout for AMP
3099 * controllers is 10 seconds.
3100 *
3101 * Class 1 devices use 0xffffffff for their
3102 * best-effort flush timeout, so the clamping logic
3103 * will result in a timeout that meets the above
3104 * requirement. ERTM timeouts are 16-bit values, so
3105 * the maximum timeout is 65.535 seconds.
3106 */
3107
3108 /* Convert timeout to milliseconds and round */
3109 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3110
3111 /* This is the recommended formula for class 2 devices
3112 * that start ERTM timers when packets are sent to the
3113 * controller.
3114 */
3115 ertm_to = 3 * ertm_to + 500;
3116
3117 if (ertm_to > 0xffff)
3118 ertm_to = 0xffff;
3119
3120 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3121 rfc->monitor_timeout = rfc->retrans_timeout;
3122 } else {
3123 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3124 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3125 }
3126}
3127
6327eb98
AE		 3128static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3129{
3130 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3131 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3132 /* use extended control field */
3133 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3134 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3135 } else {
6327eb98 3136 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3137 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3138 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3139 }
c20f8e35 3140 chan->ack_win = chan->tx_win;
6327eb98
AE		 3141}
3142
710f9b0a 3143static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3144{
1da177e4 3145 struct l2cap_conf_req *req = data;
0c1bc5c6 3146 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3147 void *ptr = req->data;
c8f79162 3148 u16 size;
1da177e4 3149
49208c9c 3150 BT_DBG("chan %p", chan);
1da177e4 3151
73ffa904 3152 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3153 goto done;
3154
0c1bc5c6 3155 switch (chan->mode) {
f2fcfcd6
GP		 3156 case L2CAP_MODE_STREAMING:
3157 case L2CAP_MODE_ERTM:
c1360a1c 3158 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3159 break;
85eb53c6 3160
848566b3 3161 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3162 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3163
2ba13ed6 3164 /* fall through */
f2fcfcd6 3165 default:
8c1d787b 3166 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3167 break;
3168 }
3169
3170done:
0c1bc5c6
GP		 3171 if (chan->imtu != L2CAP_DEFAULT_MTU)
3172 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3173
0c1bc5c6 3174 switch (chan->mode) {
65c7c491 3175 case L2CAP_MODE_BASIC:
8c1d787b 3176 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3177 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3178 break;
3179
62547752
GP		 3180 rfc.mode = L2CAP_MODE_BASIC;
3181 rfc.txwin_size = 0;
3182 rfc.max_transmit = 0;
3183 rfc.retrans_timeout = 0;
3184 rfc.monitor_timeout = 0;
3185 rfc.max_pdu_size = 0;
3186
63406504 3187 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3188 (unsigned long) &rfc);
65c7c491
MH		 3189 break;
3190
3191 case L2CAP_MODE_ERTM:
3192 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3193 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3194
3195 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3196
3197 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3198 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3199 L2CAP_FCS_SIZE);
c8f79162 3200 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3201
6327eb98
AE		 3202 l2cap_txwin_setup(chan);
3203
3204 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3205 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3206
63406504 3207 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3208 (unsigned long) &rfc);
63406504 3209
f89cef09
AE		 3210 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3211 l2cap_add_opt_efs(&ptr, chan);
3212
6327eb98
AE		 3213 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3214 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3215 chan->tx_win);
60918918
AE		 3216
3217 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3218 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3219 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3220 chan->fcs = L2CAP_FCS_NONE;
3221 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3222 chan->fcs);
3223 }
f2fcfcd6
GP		 3224 break;
3225
3226 case L2CAP_MODE_STREAMING:
273759e2 3227 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3228 rfc.mode = L2CAP_MODE_STREAMING;
3229 rfc.txwin_size = 0;
3230 rfc.max_transmit = 0;
3231 rfc.retrans_timeout = 0;
3232 rfc.monitor_timeout = 0;
c8f79162
AE		 3233
3234 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3235 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3236 L2CAP_FCS_SIZE);
c8f79162 3237 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3238
63406504 3239 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3240 (unsigned long) &rfc);
63406504 3241
f89cef09
AE		 3242 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3243 l2cap_add_opt_efs(&ptr, chan);
3244
60918918
AE		 3245 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3246 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3247 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3248 chan->fcs = L2CAP_FCS_NONE;
3249 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3250 chan->fcs);
3251 }
65c7c491
MH		 3252 break;
3253 }
1da177e4 3254
fe4128e0 3255 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3256 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3257
3258 return ptr - data;
3259}
3260
73ffa904 3261static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3262{
5dee9e7c
MH		 3263 struct l2cap_conf_rsp *rsp = data;
3264 void *ptr = rsp->data;
73ffa904
GP		 3265 void *req = chan->conf_req;
3266 int len = chan->conf_len;
5dee9e7c
MH		 3267 int type, hint, olen;
3268 unsigned long val;
6464f35f 3269 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3270 struct l2cap_conf_efs efs;
3271 u8 remote_efs = 0;
861d6882 3272 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3273 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3274 u16 size;
1da177e4 3275
73ffa904 3276 BT_DBG("chan %p", chan);
820ae1b8 3277
5dee9e7c
MH		 3278 while (len >= L2CAP_CONF_OPT_SIZE) {
3279 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3280
589d2746 3281 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3282 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3283
3284 switch (type) {
3285 case L2CAP_CONF_MTU:
861d6882 3286 mtu = val;
5dee9e7c
MH		 3287 break;
3288
3289 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3290 chan->flush_to = val;
5dee9e7c
MH		 3291 break;
3292
3293 case L2CAP_CONF_QOS:
3294 break;
3295
6464f35f
MH		 3296 case L2CAP_CONF_RFC:
3297 if (olen == sizeof(rfc))
3298 memcpy(&rfc, (void *) val, olen);
3299 break;
3300
fcc203c3
GP		 3301 case L2CAP_CONF_FCS:
3302 if (val == L2CAP_FCS_NONE)
f2592d3e 3303 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3304 break;
fcc203c3 3305
42dceae2
AE		 3306 case L2CAP_CONF_EFS:
3307 remote_efs = 1;
3308 if (olen == sizeof(efs))
3309 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3310 break;
3311
6327eb98 3312 case L2CAP_CONF_EWS:
848566b3 3313 if (!chan->conn->hs_enabled)
6327eb98 3314 return -ECONNREFUSED;
fcc203c3 3315
6327eb98
AE		 3316 set_bit(FLAG_EXT_CTRL, &chan->flags);
3317 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3318 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3319 chan->remote_tx_win = val;
fcc203c3
GP		 3320 break;
3321
5dee9e7c
MH		 3322 default:
3323 if (hint)
3324 break;
3325
3326 result = L2CAP_CONF_UNKNOWN;
3327 *((u8 *) ptr++) = type;
3328 break;
3329 }
3330 }
3331
73ffa904 3332 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3333 goto done;
3334
0c1bc5c6 3335 switch (chan->mode) {
f2fcfcd6
GP		 3336 case L2CAP_MODE_STREAMING:
3337 case L2CAP_MODE_ERTM:
c1360a1c 3338 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3339 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3340 chan->conn->feat_mask);
85eb53c6
GP		 3341 break;
3342 }
3343
42dceae2 3344 if (remote_efs) {
848566b3 3345 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3346 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3347 else
3348 return -ECONNREFUSED;
3349 }
3350
0c1bc5c6 3351 if (chan->mode != rfc.mode)
f2fcfcd6 3352 return -ECONNREFUSED;
742e519b 3353
f2fcfcd6 3354 break;
f2fcfcd6
GP		 3355 }
3356
3357done:
0c1bc5c6 3358 if (chan->mode != rfc.mode) {
f2fcfcd6 3359 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3360 rfc.mode = chan->mode;
f2fcfcd6 3361
73ffa904 3362 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3363 return -ECONNREFUSED;
3364
2d792818
GP		 3365 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3366 (unsigned long) &rfc);
f2fcfcd6
GP		 3367 }
3368
5dee9e7c
MH		 3369 if (result == L2CAP_CONF_SUCCESS) {
3370 /* Configure output options and let the other side know
3371 * which ones we don't like. */
3372
f2fcfcd6
GP		 3373 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3374 result = L2CAP_CONF_UNACCEPT;
3375 else {
0c1bc5c6 3376 chan->omtu = mtu;
c1360a1c 3377 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3378 }
0c1bc5c6 3379 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3380
42dceae2
AE		 3381 if (remote_efs) {
3382 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3383 efs.stype != L2CAP_SERV_NOTRAFIC &&
3384 efs.stype != chan->local_stype) {
42dceae2
AE		 3385
3386 result = L2CAP_CONF_UNACCEPT;
3387
3388 if (chan->num_conf_req >= 1)
3389 return -ECONNREFUSED;
3390
3391 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3392 sizeof(efs),
3393 (unsigned long) &efs);
0e8b207e 3394 } else {
3e6b3b95 3395 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3396 result = L2CAP_CONF_PENDING;
3397 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3398 }
3399 }
3400
f2fcfcd6
GP		 3401 switch (rfc.mode) {
3402 case L2CAP_MODE_BASIC:
47d1ec61 3403 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3404 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3405 break;
3406
3407 case L2CAP_MODE_ERTM:
6327eb98
AE		 3408 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3409 chan->remote_tx_win = rfc.txwin_size;
3410 else
3411 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3412
2c03a7a4 3413 chan->remote_max_tx = rfc.max_transmit;
1c762159 3414
c8f79162 3415 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3416 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3417 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3418 rfc.max_pdu_size = cpu_to_le16(size);
3419 chan->remote_mps = size;
f2fcfcd6 3420
36c86c85 3421 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3422
c1360a1c 3423 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3424
3425 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3426 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3427
42dceae2
AE		 3428 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3429 chan->remote_id = efs.id;
3430 chan->remote_stype = efs.stype;
3431 chan->remote_msdu = le16_to_cpu(efs.msdu);
3432 chan->remote_flush_to =
2d792818 3433 le32_to_cpu(efs.flush_to);
42dceae2 3434 chan->remote_acc_lat =
2d792818 3435 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3436 chan->remote_sdu_itime =
3437 le32_to_cpu(efs.sdu_itime);
3438 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3439 sizeof(efs),
3440 (unsigned long) &efs);
42dceae2 3441 }
f2fcfcd6
GP		 3442 break;
3443
3444 case L2CAP_MODE_STREAMING:
c8f79162 3445 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3446 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3447 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3448 rfc.max_pdu_size = cpu_to_le16(size);
3449 chan->remote_mps = size;
f2fcfcd6 3450
c1360a1c 3451 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3452
2d792818
GP		 3453 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3454 (unsigned long) &rfc);
68ae6639 3455
f2fcfcd6
GP		 3456 break;
3457
3458 default:
5dee9e7c 3459 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3460
6464f35f 3461 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3462 rfc.mode = chan->mode;
f2fcfcd6 3463 }
6464f35f 3464
f2fcfcd6 3465 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3466 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3467 }
fe4128e0 3468 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3469 rsp->result = cpu_to_le16(result);
59e54bd1 3470 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3471
3472 return ptr - data;
1da177e4
LT		 3473}
3474
2d792818
GP		 3475static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3476 void *data, u16 *result)
f2fcfcd6 3477{
f2fcfcd6
GP		 3478 struct l2cap_conf_req *req = data;
3479 void *ptr = req->data;
3480 int type, olen;
3481 unsigned long val;
36e999a8 3482 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3483 struct l2cap_conf_efs efs;
f2fcfcd6 3484
fe4128e0 3485 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3486
3487 while (len >= L2CAP_CONF_OPT_SIZE) {
3488 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3489
3490 switch (type) {
3491 case L2CAP_CONF_MTU:
3492 if (val < L2CAP_DEFAULT_MIN_MTU) {
3493 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3494 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3495 } else
0c1bc5c6
GP		 3496 chan->imtu = val;
3497 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3498 break;
3499
3500 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3501 chan->flush_to = val;
f2fcfcd6 3502 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3503 2, chan->flush_to);
f2fcfcd6
GP		 3504 break;
3505
3506 case L2CAP_CONF_RFC:
3507 if (olen == sizeof(rfc))
3508 memcpy(&rfc, (void *)val, olen);
3509
c1360a1c 3510 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3511 rfc.mode != chan->mode)
f2fcfcd6
GP		 3512 return -ECONNREFUSED;
3513
47d1ec61 3514 chan->fcs = 0;
f2fcfcd6
GP		 3515
3516 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3517 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3518 break;
6327eb98
AE		 3519
3520 case L2CAP_CONF_EWS:
c20f8e35 3521 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3522 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3523 chan->tx_win);
6327eb98 3524 break;
66af7aaf
AE		 3525
3526 case L2CAP_CONF_EFS:
3527 if (olen == sizeof(efs))
3528 memcpy(&efs, (void *)val, olen);
3529
3530 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3531 efs.stype != L2CAP_SERV_NOTRAFIC &&
3532 efs.stype != chan->local_stype)
66af7aaf
AE		 3533 return -ECONNREFUSED;
3534
2d792818
GP		 3535 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3536 (unsigned long) &efs);
66af7aaf 3537 break;
cbabee78
AE		 3538
3539 case L2CAP_CONF_FCS:
3540 if (*result == L2CAP_CONF_PENDING)
3541 if (val == L2CAP_FCS_NONE)
f2592d3e 3542 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3543 &chan->conf_state);
3544 break;
f2fcfcd6
GP		 3545 }
3546 }
3547
0c1bc5c6 3548 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3549 return -ECONNREFUSED;
3550
0c1bc5c6 3551 chan->mode = rfc.mode;
6c2ea7a8 3552
0e8b207e 3553 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3554 switch (rfc.mode) {
3555 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3556 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3557 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3558 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3559 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3560 chan->ack_win = min_t(u16, chan->ack_win,
3561 rfc.txwin_size);
66af7aaf
AE		 3562
3563 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3564 chan->local_msdu = le16_to_cpu(efs.msdu);
3565 chan->local_sdu_itime =
2d792818 3566 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3567 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3568 chan->local_flush_to =
2d792818 3569 le32_to_cpu(efs.flush_to);
66af7aaf 3570 }
f2fcfcd6 3571 break;
66af7aaf 3572
f2fcfcd6 3573 case L2CAP_MODE_STREAMING:
47d1ec61 3574 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3575 }
3576 }
3577
fe4128e0 3578 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3579 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3580
3581 return ptr - data;
3582}
3583
2d792818
GP		 3584static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3585 u16 result, u16 flags)
1da177e4
LT		 3586{
3587 struct l2cap_conf_rsp *rsp = data;
3588 void *ptr = rsp->data;
1da177e4 3589
fe4128e0 3590 BT_DBG("chan %p", chan);
1da177e4 3591
fe4128e0 3592 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3593 rsp->result = cpu_to_le16(result);
aca3192c 3594 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3595
3596 return ptr - data;
3597}
3598
27e2d4c8
JH		 3599void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3600{
3601 struct l2cap_le_conn_rsp rsp;
3602 struct l2cap_conn *conn = chan->conn;
3603
3604 BT_DBG("chan %p", chan);
3605
3606 rsp.dcid = cpu_to_le16(chan->scid);
3607 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3608 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3609 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 3610 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3611
3612 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3613 &rsp);
3614}
3615
8c1d787b 3616void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3617{
3618 struct l2cap_conn_rsp rsp;
8c1d787b 3619 struct l2cap_conn *conn = chan->conn;
710f9b0a 3620 u8 buf[128];
439f34ac 3621 u8 rsp_code;
710f9b0a 3622
fe4128e0
GP		 3623 rsp.scid = cpu_to_le16(chan->dcid);
3624 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3625 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3626 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3627
3628 if (chan->hs_hcon)
3629 rsp_code = L2CAP_CREATE_CHAN_RSP;
3630 else
3631 rsp_code = L2CAP_CONN_RSP;
3632
3633 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3634
3635 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3636
c1360a1c 3637 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3638 return;
3639
710f9b0a 3640 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3641 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3642 chan->num_conf_req++;
3643}
3644
47d1ec61 3645static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3646{
7b1c0049
GP		 3647 int type, olen;
3648 unsigned long val;
c20f8e35
MM		 3649 /* Use sane default values in case a misbehaving remote device
3650 * did not send an RFC or extended window size option.
3651 */
3652 u16 txwin_ext = chan->ack_win;
3653 struct l2cap_conf_rfc rfc = {
3654 .mode = chan->mode,
3655 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3656 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3657 .max_pdu_size = cpu_to_le16(chan->imtu),
3658 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3659 };
7b1c0049 3660
47d1ec61 3661 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3662
0c1bc5c6 3663 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3664 return;
3665
3666 while (len >= L2CAP_CONF_OPT_SIZE) {
3667 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3668
c20f8e35
MM		 3669 switch (type) {
3670 case L2CAP_CONF_RFC:
3671 if (olen == sizeof(rfc))
3672 memcpy(&rfc, (void *)val, olen);
8f321f85 3673 break;
c20f8e35
MM		 3674 case L2CAP_CONF_EWS:
3675 txwin_ext = val;
3676 break;
3677 }
7b1c0049
GP		 3678 }
3679
7b1c0049
GP		 3680 switch (rfc.mode) {
3681 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3682 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3683 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3684 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3685 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3686 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3687 else
3688 chan->ack_win = min_t(u16, chan->ack_win,
3689 rfc.txwin_size);
7b1c0049
GP		 3690 break;
3691 case L2CAP_MODE_STREAMING:
47d1ec61 3692 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3693 }
3694}
3695
2d792818 3696static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3697 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3698 u8 *data)
4e8402a3 3699{
e2fd318e 3700 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3701
cb3b3152
JH		 3702 if (cmd_len < sizeof(*rej))
3703 return -EPROTO;
3704
e2fd318e 3705 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3706 return 0;
3707
3708 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3709 cmd->ident == conn->info_ident) {
17cd3f37 3710 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3711
3712 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3713 conn->info_ident = 0;
984947dc 3714
4e8402a3
MH		 3715 l2cap_conn_start(conn);
3716 }
3717
3718 return 0;
3719}
3720
1700915f
MM		 3721static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3722 struct l2cap_cmd_hdr *cmd,
3723 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3724{
1da177e4
LT		 3725 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3726 struct l2cap_conn_rsp rsp;
23691d75 3727 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3728 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3729
3730 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3731 __le16 psm = req->psm;
1da177e4 3732
097db76c 3733 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3734
3735 /* Check if we have socket listening on psm */
6f59b904 3736 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3737 &conn->hcon->dst, ACL_LINK);
23691d75 3738 if (!pchan) {
1da177e4
LT		 3739 result = L2CAP_CR_BAD_PSM;
3740 goto sendresp;
3741 }
3742
3df91ea2 3743 mutex_lock(&conn->chan_lock);
8ffb9290 3744 l2cap_chan_lock(pchan);
e0f0cb56 3745
e7c29cb1 3746 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3747 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3748 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3749 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3750 result = L2CAP_CR_SEC_BLOCK;
3751 goto response;
3752 }
3753
1da177e4
LT		 3754 result = L2CAP_CR_NO_MEM;
3755
2dfa1003
GP		 3756 /* Check if we already have channel with that dcid */
3757 if (__l2cap_get_chan_by_dcid(conn, scid))
3758 goto response;
3759
80b98027 3760 chan = pchan->ops->new_connection(pchan);
80808e43 3761 if (!chan)
1da177e4
LT		 3762 goto response;
3763
330b6c15
SS		 3764 /* For certain devices (ex: HID mouse), support for authentication,
3765 * pairing and bonding is optional. For such devices, inorder to avoid
3766 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3767 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3768 */
3769 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3770
7eafc59e
MH		 3771 bacpy(&chan->src, &conn->hcon->src);
3772 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 3773 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3774 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
fe4128e0
GP		 3775 chan->psm = psm;
3776 chan->dcid = scid;
1700915f 3777 chan->local_amp_id = amp_id;
1da177e4 3778
6be36555 3779 __l2cap_chan_add(conn, chan);
48454079 3780
fe4128e0 3781 dcid = chan->scid;
1da177e4 3782
8d836d71 3783 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 3784
fc7f8a7e 3785 chan->ident = cmd->ident;
1da177e4 3786
984947dc 3787 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 3788 if (l2cap_chan_check_security(chan)) {
bdc25783 3789 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 3790 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 3791 result = L2CAP_CR_PEND;
3792 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 3793 chan->ops->defer(chan);
f66dc81f 3794 } else {
1700915f
MM		 3795 /* Force pending result for AMP controllers.
3796 * The connection will succeed after the
3797 * physical link is up.
3798 */
6ed971ca 3799 if (amp_id == AMP_ID_BREDR) {
f93fa273 3800 l2cap_state_change(chan, BT_CONFIG);
1700915f 3801 result = L2CAP_CR_SUCCESS;
6ed971ca 3802 } else {
f93fa273 3803 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 3804 result = L2CAP_CR_PEND;
1700915f 3805 }
f66dc81f
MH		 3806 status = L2CAP_CS_NO_INFO;
3807 }
79d554a6 3808 } else {
f93fa273 3809 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3810 result = L2CAP_CR_PEND;
3811 status = L2CAP_CS_AUTHEN_PEND;
3812 }
3813 } else {
f93fa273 3814 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 3815 result = L2CAP_CR_PEND;
3816 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3817 }
3818
1da177e4 3819response:
8ffb9290 3820 l2cap_chan_unlock(pchan);
3df91ea2 3821 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3822
3823sendresp:
aca3192c
YH		 3824 rsp.scid = cpu_to_le16(scid);
3825 rsp.dcid = cpu_to_le16(dcid);
3826 rsp.result = cpu_to_le16(result);
3827 rsp.status = cpu_to_le16(status);
4c89b6aa 3828 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 3829
3830 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3831 struct l2cap_info_req info;
ac73498c 3832 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 3833
3834 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3835 conn->info_ident = l2cap_get_ident(conn);
3836
ba13ccd9 3837 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 3838
2d792818
GP		 3839 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3840 sizeof(info), &info);
79d554a6
MH		 3841 }
3842
c1360a1c 3843 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 3844 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 3845 u8 buf[128];
c1360a1c 3846 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 3847 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3848 l2cap_build_conf_req(chan, buf), buf);
73ffa904 3849 chan->num_conf_req++;
e9aeb2dd 3850 }
1700915f
MM		 3851
3852 return chan;
4c89b6aa 3853}
e9aeb2dd 3854
4c89b6aa 3855static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 3856 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 3857{
7b064eda
JK		 3858 struct hci_dev *hdev = conn->hcon->hdev;
3859 struct hci_conn *hcon = conn->hcon;
3860
cb3b3152
JH		 3861 if (cmd_len < sizeof(struct l2cap_conn_req))
3862 return -EPROTO;
3863
7b064eda
JK		 3864 hci_dev_lock(hdev);
3865 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3866 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3867 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3868 hcon->dst_type, 0, NULL, 0,
3869 hcon->dev_class);
3870 hci_dev_unlock(hdev);
3871
300229f9 3872 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 3873 return 0;
3874}
3875
5909cf30 3876static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 3877 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3878 u8 *data)
1da177e4
LT		 3879{
3880 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3881 u16 scid, dcid, result, status;
48454079 3882 struct l2cap_chan *chan;
1da177e4 3883 u8 req[128];
3df91ea2 3884 int err;
1da177e4 3885
cb3b3152
JH		 3886 if (cmd_len < sizeof(*rsp))
3887 return -EPROTO;
3888
1da177e4
LT		 3889 scid = __le16_to_cpu(rsp->scid);
3890 dcid = __le16_to_cpu(rsp->dcid);
3891 result = __le16_to_cpu(rsp->result);
3892 status = __le16_to_cpu(rsp->status);
3893
1b009c98 3894 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 3895 dcid, scid, result, status);
1da177e4 3896
3df91ea2
AE		 3897 mutex_lock(&conn->chan_lock);
3898
1da177e4 3899 if (scid) {
3df91ea2
AE		 3900 chan = __l2cap_get_chan_by_scid(conn, scid);
3901 if (!chan) {
21870b52 3902 err = -EBADSLT;
3df91ea2
AE		 3903 goto unlock;
3904 }
1da177e4 3905 } else {
3df91ea2
AE		 3906 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3907 if (!chan) {
21870b52 3908 err = -EBADSLT;
3df91ea2
AE		 3909 goto unlock;
3910 }
1da177e4
LT		 3911 }
3912
3df91ea2
AE		 3913 err = 0;
3914
6be36555 3915 l2cap_chan_lock(chan);
48454079 3916
1da177e4
LT		 3917 switch (result) {
3918 case L2CAP_CR_SUCCESS:
89bc500e 3919 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 3920 chan->ident = 0;
fe4128e0 3921 chan->dcid = dcid;
c1360a1c 3922 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 3923
c1360a1c 3924 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 3925 break;
3926
1da177e4 3927 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3928 l2cap_build_conf_req(chan, req), req);
73ffa904 3929 chan->num_conf_req++;
1da177e4
LT		 3930 break;
3931
3932 case L2CAP_CR_PEND:
c1360a1c 3933 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 3934 break;
3935
3936 default:
48454079 3937 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 3938 break;
3939 }
3940
6be36555 3941 l2cap_chan_unlock(chan);
3df91ea2
AE		 3942
3943unlock:
3944 mutex_unlock(&conn->chan_lock);
3945
3946 return err;
1da177e4
LT		 3947}
3948
47d1ec61 3949static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 3950{
3951 /* FCS is enabled only in ERTM or streaming mode, if one or both
3952 * sides request it.
3953 */
0c1bc5c6 3954 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 3955 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 3956 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 3957 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 3958}
3959
29d8a590
AE		 3960static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3961 u8 ident, u16 flags)
3962{
3963 struct l2cap_conn *conn = chan->conn;
3964
3965 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3966 flags);
3967
3968 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3969 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3970
3971 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3972 l2cap_build_conf_rsp(chan, data,
3973 L2CAP_CONF_SUCCESS, flags), data);
3974}
3975
662d652d
JH		 3976static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
3977 u16 scid, u16 dcid)
3978{
3979 struct l2cap_cmd_rej_cid rej;
3980
3981 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
3982 rej.scid = __cpu_to_le16(scid);
3983 rej.dcid = __cpu_to_le16(dcid);
3984
3985 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3986}
3987
2d792818
GP		 3988static inline int l2cap_config_req(struct l2cap_conn *conn,
3989 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3990 u8 *data)
1da177e4
LT		 3991{
3992 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3993 u16 dcid, flags;
3994 u8 rsp[64];
48454079 3995 struct l2cap_chan *chan;
3c588192 3996 int len, err = 0;
1da177e4 3997
cb3b3152
JH		 3998 if (cmd_len < sizeof(*req))
3999 return -EPROTO;
4000
1da177e4
LT		 4001 dcid = __le16_to_cpu(req->dcid);
4002 flags = __le16_to_cpu(req->flags);
4003
4004 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4005
baa7e1fa 4006 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4007 if (!chan) {
4008 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4009 return 0;
4010 }
1da177e4 4011
033b1142 4012 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4013 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4014 chan->dcid);
354f60a9 4015 goto unlock;
df6bd743 4016 }
354f60a9 4017
5dee9e7c 4018 /* Reject if config buffer is too small. */
88219a0f 4019 len = cmd_len - sizeof(*req);
cb3b3152 4020 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4021 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4022 l2cap_build_conf_rsp(chan, rsp,
4023 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4024 goto unlock;
4025 }
4026
4027 /* Store config. */
73ffa904
GP		 4028 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4029 chan->conf_len += len;
1da177e4 4030
59e54bd1 4031 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4032 /* Incomplete config. Send empty response. */
4033 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4034 l2cap_build_conf_rsp(chan, rsp,
4035 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4036 goto unlock;
4037 }
4038
4039 /* Complete config. */
73ffa904 4040 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4041 if (len < 0) {
5e4e3972 4042 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4043 goto unlock;
f2fcfcd6 4044 }
1da177e4 4045
1500109b 4046 chan->ident = cmd->ident;
5dee9e7c 4047 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4048 chan->num_conf_rsp++;
5dee9e7c 4049
5dee9e7c 4050 /* Reset config buffer. */
73ffa904 4051 chan->conf_len = 0;
5dee9e7c 4052
c1360a1c 4053 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4054 goto unlock;
4055
c1360a1c 4056 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4057 set_default_fcs(chan);
fcc203c3 4058
105bdf9e
MM		 4059 if (chan->mode == L2CAP_MODE_ERTM ||
4060 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4061 err = l2cap_ertm_init(chan);
4062
4063 if (err < 0)
5e4e3972 4064 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4065 else
4066 l2cap_chan_ready(chan);
0565c1c2 4067
876d9484
MH		 4068 goto unlock;
4069 }
4070
c1360a1c 4071 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4072 u8 buf[64];
1da177e4 4073 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4074 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4075 chan->num_conf_req++;
1da177e4
LT		 4076 }
4077
0e8b207e
AE		 4078 /* Got Conf Rsp PENDING from remote side and asume we sent
4079 Conf Rsp PENDING in the code above */
4080 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4081 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4082
4083 /* check compatibility */
4084
79de886d 4085 /* Send rsp for BR/EDR channel */
f351bc72 4086 if (!chan->hs_hcon)
79de886d
AE		 4087 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4088 else
4089 chan->ident = cmd->ident;
0e8b207e
AE		 4090 }
4091
1da177e4 4092unlock:
6be36555 4093 l2cap_chan_unlock(chan);
3c588192 4094 return err;
1da177e4
LT		 4095}
4096
2d792818 4097static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4098 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4099 u8 *data)
1da177e4
LT		 4100{
4101 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4102 u16 scid, flags, result;
48454079 4103 struct l2cap_chan *chan;
cb3b3152 4104 int len = cmd_len - sizeof(*rsp);
3c588192 4105 int err = 0;
1da177e4 4106
cb3b3152
JH		 4107 if (cmd_len < sizeof(*rsp))
4108 return -EPROTO;
4109
1da177e4
LT		 4110 scid = __le16_to_cpu(rsp->scid);
4111 flags = __le16_to_cpu(rsp->flags);
4112 result = __le16_to_cpu(rsp->result);
4113
61386cba
AE		 4114 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4115 result, len);
1da177e4 4116
baa7e1fa 4117 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4118 if (!chan)
1da177e4
LT		 4119 return 0;
4120
4121 switch (result) {
4122 case L2CAP_CONF_SUCCESS:
47d1ec61 4123 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4124 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4125 break;
4126
0e8b207e
AE		 4127 case L2CAP_CONF_PENDING:
4128 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4129
4130 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4131 char buf[64];
4132
4133 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4134 buf, &result);
0e8b207e 4135 if (len < 0) {
5e4e3972 4136 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4137 goto done;
4138 }
4139
f351bc72 4140 if (!chan->hs_hcon) {
79de886d
AE		 4141 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4142 0);
5ce66b59
AE		 4143 } else {
4144 if (l2cap_check_efs(chan)) {
4145 amp_create_logical_link(chan);
4146 chan->ident = cmd->ident;
4147 }
4148 }
0e8b207e
AE		 4149 }
4150 goto done;
4151
1da177e4 4152 case L2CAP_CONF_UNACCEPT:
73ffa904 4153 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4154 char req[64];
4155
c2c77ec8 4156 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4157 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4158 goto done;
4159 }
4160
f2fcfcd6
GP		 4161 /* throw out any old stored conf requests */
4162 result = L2CAP_CONF_SUCCESS;
b4450035 4163 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4164 req, &result);
f2fcfcd6 4165 if (len < 0) {
5e4e3972 4166 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4167 goto done;
4168 }
4169
4170 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4171 L2CAP_CONF_REQ, len, req);
73ffa904 4172 chan->num_conf_req++;
f2fcfcd6
GP		 4173 if (result != L2CAP_CONF_SUCCESS)
4174 goto done;
4175 break;
1da177e4
LT		 4176 }
4177
8e87d142 4178 default:
6be36555 4179 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4180
ba13ccd9 4181 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4182 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4183 goto done;
4184 }
4185
59e54bd1 4186 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4187 goto done;
4188
c1360a1c 4189 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4190
c1360a1c 4191 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4192 set_default_fcs(chan);
fcc203c3 4193
105bdf9e
MM		 4194 if (chan->mode == L2CAP_MODE_ERTM ||
4195 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4196 err = l2cap_ertm_init(chan);
0565c1c2 4197
3c588192 4198 if (err < 0)
5e4e3972 4199 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4200 else
4201 l2cap_chan_ready(chan);
1da177e4
LT		 4202 }
4203
4204done:
6be36555 4205 l2cap_chan_unlock(chan);
3c588192 4206 return err;
1da177e4
LT		 4207}
4208
2d792818 4209static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4210 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4211 u8 *data)
1da177e4
LT		 4212{
4213 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4214 struct l2cap_disconn_rsp rsp;
4215 u16 dcid, scid;
48454079 4216 struct l2cap_chan *chan;
1da177e4 4217
cb3b3152
JH		 4218 if (cmd_len != sizeof(*req))
4219 return -EPROTO;
4220
1da177e4
LT		 4221 scid = __le16_to_cpu(req->scid);
4222 dcid = __le16_to_cpu(req->dcid);
4223
4224 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4225
3df91ea2
AE		 4226 mutex_lock(&conn->chan_lock);
4227
4228 chan = __l2cap_get_chan_by_scid(conn, dcid);
4229 if (!chan) {
4230 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4231 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4232 return 0;
3df91ea2 4233 }
1da177e4 4234
6be36555
AE		 4235 l2cap_chan_lock(chan);
4236
fe4128e0
GP		 4237 rsp.dcid = cpu_to_le16(chan->scid);
4238 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4239 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4240
5ec1bbe5 4241 chan->ops->set_shutdown(chan);
1da177e4 4242
61d6ef3e 4243 l2cap_chan_hold(chan);
48454079 4244 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4245
4246 l2cap_chan_unlock(chan);
1da177e4 4247
80b98027 4248 chan->ops->close(chan);
61d6ef3e 4249 l2cap_chan_put(chan);
3df91ea2
AE		 4250
4251 mutex_unlock(&conn->chan_lock);
4252
1da177e4
LT		 4253 return 0;
4254}
4255
2d792818 4256static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4257 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4258 u8 *data)
1da177e4
LT		 4259{
4260 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4261 u16 dcid, scid;
48454079 4262 struct l2cap_chan *chan;
1da177e4 4263
cb3b3152
JH		 4264 if (cmd_len != sizeof(*rsp))
4265 return -EPROTO;
4266
1da177e4
LT		 4267 scid = __le16_to_cpu(rsp->scid);
4268 dcid = __le16_to_cpu(rsp->dcid);
4269
4270 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4271
3df91ea2
AE		 4272 mutex_lock(&conn->chan_lock);
4273
4274 chan = __l2cap_get_chan_by_scid(conn, scid);
4275 if (!chan) {
4276 mutex_unlock(&conn->chan_lock);
1da177e4 4277 return 0;
3df91ea2 4278 }
1da177e4 4279
6be36555 4280 l2cap_chan_lock(chan);
48454079 4281
61d6ef3e 4282 l2cap_chan_hold(chan);
48454079 4283 l2cap_chan_del(chan, 0);
6be36555
AE		 4284
4285 l2cap_chan_unlock(chan);
1da177e4 4286
80b98027 4287 chan->ops->close(chan);
61d6ef3e 4288 l2cap_chan_put(chan);
3df91ea2
AE		 4289
4290 mutex_unlock(&conn->chan_lock);
4291
1da177e4
LT		 4292 return 0;
4293}
4294
2d792818 4295static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4296 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4297 u8 *data)
1da177e4
LT		 4298{
4299 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4300 u16 type;
4301
cb3b3152
JH		 4302 if (cmd_len != sizeof(*req))
4303 return -EPROTO;
4304
1da177e4
LT		 4305 type = __le16_to_cpu(req->type);
4306
4307 BT_DBG("type 0x%4.4x", type);
4308
f0709e03
MH		 4309 if (type == L2CAP_IT_FEAT_MASK) {
4310 u8 buf[8];
44dd46de 4311 u32 feat_mask = l2cap_feat_mask;
f0709e03 4312 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4313 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4314 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4315 if (!disable_ertm)
fcc203c3 4316 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4317 | L2CAP_FEAT_FCS;
848566b3 4318 if (conn->hs_enabled)
6327eb98 4319 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4320 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4321
1b7bf4ed 4322 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4323 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4324 buf);
e1027a7c
MH		 4325 } else if (type == L2CAP_IT_FIXED_CHAN) {
4326 u8 buf[12];
4327 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4328
848566b3 4329 if (conn->hs_enabled)
50a147cd
MM		 4330 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4331 else
4332 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4333
ac73498c
AE		 4334 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4335 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4336 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4337 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4338 buf);
f0709e03
MH		 4339 } else {
4340 struct l2cap_info_rsp rsp;
4341 rsp.type = cpu_to_le16(type);
ac73498c 4342 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4343 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4344 &rsp);
f0709e03 4345 }
1da177e4
LT		 4346
4347 return 0;
4348}
4349
2d792818 4350static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4351 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4352 u8 *data)
1da177e4
LT		 4353{
4354 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4355 u16 type, result;
4356
3f6fa3d4 4357 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4358 return -EPROTO;
4359
1da177e4
LT		 4360 type = __le16_to_cpu(rsp->type);
4361 result = __le16_to_cpu(rsp->result);
4362
4363 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4364
e90165be
AE		 4365 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4366 if (cmd->ident != conn->info_ident ||
2d792818 4367 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4368 return 0;
4369
17cd3f37 4370 cancel_delayed_work(&conn->info_timer);
4e8402a3 4371
adb08ede
VT		 4372 if (result != L2CAP_IR_SUCCESS) {
4373 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4374 conn->info_ident = 0;
4375
4376 l2cap_conn_start(conn);
4377
4378 return 0;
4379 }
4380
978c93b9
AE		 4381 switch (type) {
4382 case L2CAP_IT_FEAT_MASK:
83985319 4383 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4384
47ec1dcd 4385 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4386 struct l2cap_info_req req;
ac73498c 4387 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4388
4389 conn->info_ident = l2cap_get_ident(conn);
4390
4391 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4392 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4393 } else {
4394 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4395 conn->info_ident = 0;
4396
4397 l2cap_conn_start(conn);
4398 }
978c93b9
AE		 4399 break;
4400
4401 case L2CAP_IT_FIXED_CHAN:
4402 conn->fixed_chan_mask = rsp->data[0];
984947dc 4403 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4404 conn->info_ident = 0;
984947dc
MH		 4405
4406 l2cap_conn_start(conn);
978c93b9 4407 break;
984947dc 4408 }
4e8402a3 4409
1da177e4
LT		 4410 return 0;
4411}
4412
1700915f
MM		 4413static int l2cap_create_channel_req(struct l2cap_conn *conn,
4414 struct l2cap_cmd_hdr *cmd,
4415 u16 cmd_len, void *data)
f94ff6ff
MM		 4416{
4417 struct l2cap_create_chan_req *req = data;
6e1df6a6 4418 struct l2cap_create_chan_rsp rsp;
1700915f 4419 struct l2cap_chan *chan;
6e1df6a6 4420 struct hci_dev *hdev;
f94ff6ff
MM		 4421 u16 psm, scid;
4422
4423 if (cmd_len != sizeof(*req))
4424 return -EPROTO;
4425
848566b3 4426 if (!conn->hs_enabled)
f94ff6ff
MM		 4427 return -EINVAL;
4428
4429 psm = le16_to_cpu(req->psm);
4430 scid = le16_to_cpu(req->scid);
4431
ad0ac6ca 4432 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4433
6e1df6a6 4434 /* For controller id 0 make BR/EDR connection */
6ed971ca 4435 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4436 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4437 req->amp_id);
4438 return 0;
4439 }
1700915f 4440
6e1df6a6
AE		 4441 /* Validate AMP controller id */
4442 hdev = hci_dev_get(req->amp_id);
4443 if (!hdev)
4444 goto error;
1700915f 4445
6e1df6a6
AE		 4446 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4447 hci_dev_put(hdev);
4448 goto error;
4449 }
1700915f 4450
6e1df6a6
AE		 4451 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4452 req->amp_id);
4453 if (chan) {
4454 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4455 struct hci_conn *hs_hcon;
1700915f 4456
98e0f7ea
MH		 4457 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4458 &conn->hcon->dst);
6e1df6a6
AE		 4459 if (!hs_hcon) {
4460 hci_dev_put(hdev);
662d652d
JH		 4461 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4462 chan->dcid);
4463 return 0;
1700915f
MM		 4464 }
4465
6e1df6a6
AE		 4466 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4467
6e1df6a6
AE		 4468 mgr->bredr_chan = chan;
4469 chan->hs_hcon = hs_hcon;
fd45bf4c 4470 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4471 conn->mtu = hdev->block_mtu;
1700915f 4472 }
f94ff6ff 4473
6e1df6a6 4474 hci_dev_put(hdev);
f94ff6ff
MM		 4475
4476 return 0;
6e1df6a6
AE		 4477
4478error:
4479 rsp.dcid = 0;
4480 rsp.scid = cpu_to_le16(scid);
4481 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4482 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4483
4484 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4485 sizeof(rsp), &rsp);
4486
dc280801 4487 return 0;
f94ff6ff
MM		 4488}
4489
8eb200bd
MM		 4490static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4491{
4492 struct l2cap_move_chan_req req;
4493 u8 ident;
4494
4495 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4496
4497 ident = l2cap_get_ident(chan->conn);
4498 chan->ident = ident;
4499
4500 req.icid = cpu_to_le16(chan->scid);
4501 req.dest_amp_id = dest_amp_id;
4502
4503 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4504 &req);
4505
4506 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4507}
4508
1500109b 4509static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4510{
4511 struct l2cap_move_chan_rsp rsp;
4512
1500109b 4513 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4514
1500109b 4515 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4516 rsp.result = cpu_to_le16(result);
4517
1500109b
MM		 4518 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4519 sizeof(rsp), &rsp);
8d5a04a1
MM		 4520}
4521
5b155ef9 4522static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4523{
4524 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4525
5b155ef9 4526 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4527
5b155ef9 4528 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4529
5b155ef9 4530 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4531 cfm.result = cpu_to_le16(result);
4532
5b155ef9
MM		 4533 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4534 sizeof(cfm), &cfm);
4535
4536 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4537}
4538
4539static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4540{
4541 struct l2cap_move_chan_cfm cfm;
4542
4543 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4544
4545 cfm.icid = cpu_to_le16(icid);
4546 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4547
4548 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4549 sizeof(cfm), &cfm);
8d5a04a1
MM		 4550}
4551
4552static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4553 u16 icid)
8d5a04a1
MM		 4554{
4555 struct l2cap_move_chan_cfm_rsp rsp;
4556
ad0ac6ca 4557 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4558
4559 rsp.icid = cpu_to_le16(icid);
4560 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4561}
4562
5f3847a4
MM		 4563static void __release_logical_link(struct l2cap_chan *chan)
4564{
4565 chan->hs_hchan = NULL;
4566 chan->hs_hcon = NULL;
4567
4568 /* Placeholder - release the logical link */
4569}
4570
1500109b
MM		 4571static void l2cap_logical_fail(struct l2cap_chan *chan)
4572{
4573 /* Logical link setup failed */
4574 if (chan->state != BT_CONNECTED) {
4575 /* Create channel failure, disconnect */
5e4e3972 4576 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4577 return;
4578 }
4579
4580 switch (chan->move_role) {
4581 case L2CAP_MOVE_ROLE_RESPONDER:
4582 l2cap_move_done(chan);
4583 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4584 break;
4585 case L2CAP_MOVE_ROLE_INITIATOR:
4586 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4587 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4588 /* Remote has only sent pending or
4589 * success responses, clean up
4590 */
4591 l2cap_move_done(chan);
4592 }
4593
4594 /* Other amp move states imply that the move
4595 * has already aborted
4596 */
4597 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4598 break;
4599 }
4600}
4601
4602static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4603 struct hci_chan *hchan)
4604{
4605 struct l2cap_conf_rsp rsp;
1500109b 4606
336178a3 4607 chan->hs_hchan = hchan;
1500109b
MM		 4608 chan->hs_hcon->l2cap_data = chan->conn;
4609
35ba9561 4610 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4611
4612 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4613 int err;
1500109b
MM		 4614
4615 set_default_fcs(chan);
4616
4617 err = l2cap_ertm_init(chan);
4618 if (err < 0)
5e4e3972 4619 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4620 else
4621 l2cap_chan_ready(chan);
4622 }
4623}
4624
4625static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4626 struct hci_chan *hchan)
4627{
4628 chan->hs_hcon = hchan->conn;
4629 chan->hs_hcon->l2cap_data = chan->conn;
4630
4631 BT_DBG("move_state %d", chan->move_state);
4632
4633 switch (chan->move_state) {
4634 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4635 /* Move confirm will be sent after a success
4636 * response is received
4637 */
4638 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4639 break;
4640 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4641 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4642 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4643 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4644 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4645 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4646 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4647 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4648 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4649 }
4650 break;
4651 default:
4652 /* Move was not in expected state, free the channel */
4653 __release_logical_link(chan);
4654
4655 chan->move_state = L2CAP_MOVE_STABLE;
4656 }
4657}
4658
4659/* Call with chan locked */
27695fb4
AE		 4660void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4661 u8 status)
5b155ef9 4662{
1500109b
MM		 4663 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4664
4665 if (status) {
4666 l2cap_logical_fail(chan);
4667 __release_logical_link(chan);
4668 return;
4669 }
4670
4671 if (chan->state != BT_CONNECTED) {
4672 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4673 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4674 l2cap_logical_finish_create(chan, hchan);
4675 } else {
4676 l2cap_logical_finish_move(chan, hchan);
4677 }
5b155ef9
MM		 4678}
4679
3f7a56c4
MM		 4680void l2cap_move_start(struct l2cap_chan *chan)
4681{
4682 BT_DBG("chan %p", chan);
4683
6ed971ca 4684 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4685 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4686 return;
4687 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4688 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4689 /* Placeholder - start physical link setup */
4690 } else {
4691 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4692 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4693 chan->move_id = 0;
4694 l2cap_move_setup(chan);
4695 l2cap_send_move_chan_req(chan, 0);
4696 }
4697}
4698
8eb200bd
MM		 4699static void l2cap_do_create(struct l2cap_chan *chan, int result,
4700 u8 local_amp_id, u8 remote_amp_id)
4701{
62748ca1
AE		 4702 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4703 local_amp_id, remote_amp_id);
4704
12d6cc60
AE		 4705 chan->fcs = L2CAP_FCS_NONE;
4706
62748ca1
AE		 4707 /* Outgoing channel on AMP */
4708 if (chan->state == BT_CONNECT) {
4709 if (result == L2CAP_CR_SUCCESS) {
4710 chan->local_amp_id = local_amp_id;
4711 l2cap_send_create_chan_req(chan, remote_amp_id);
4712 } else {
4713 /* Revert to BR/EDR connect */
4714 l2cap_send_conn_req(chan);
4715 }
4716
4717 return;
4718 }
4719
4720 /* Incoming channel on AMP */
4721 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4722 struct l2cap_conn_rsp rsp;
4723 char buf[128];
4724 rsp.scid = cpu_to_le16(chan->dcid);
4725 rsp.dcid = cpu_to_le16(chan->scid);
4726
8eb200bd
MM		 4727 if (result == L2CAP_CR_SUCCESS) {
4728 /* Send successful response */
62cd50e2
AE		 4729 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4730 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4731 } else {
4732 /* Send negative response */
62cd50e2
AE		 4733 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4734 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4735 }
4736
4737 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4738 sizeof(rsp), &rsp);
4739
4740 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4741 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4742 set_bit(CONF_REQ_SENT, &chan->conf_state);
4743 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4744 L2CAP_CONF_REQ,
4745 l2cap_build_conf_req(chan, buf), buf);
4746 chan->num_conf_req++;
4747 }
8eb200bd
MM		 4748 }
4749}
4750
4751static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4752 u8 remote_amp_id)
4753{
4754 l2cap_move_setup(chan);
4755 chan->move_id = local_amp_id;
4756 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4757
4758 l2cap_send_move_chan_req(chan, remote_amp_id);
4759}
4760
4761static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4762{
4763 struct hci_chan *hchan = NULL;
4764
4765 /* Placeholder - get hci_chan for logical link */
4766
4767 if (hchan) {
4768 if (hchan->state == BT_CONNECTED) {
4769 /* Logical link is ready to go */
4770 chan->hs_hcon = hchan->conn;
4771 chan->hs_hcon->l2cap_data = chan->conn;
4772 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4773 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4774
4775 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4776 } else {
4777 /* Wait for logical link to be ready */
4778 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4779 }
4780 } else {
4781 /* Logical link not available */
4782 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4783 }
4784}
4785
4786static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4787{
4788 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4789 u8 rsp_result;
4790 if (result == -EINVAL)
4791 rsp_result = L2CAP_MR_BAD_ID;
4792 else
4793 rsp_result = L2CAP_MR_NOT_ALLOWED;
4794
4795 l2cap_send_move_chan_rsp(chan, rsp_result);
4796 }
4797
4798 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4799 chan->move_state = L2CAP_MOVE_STABLE;
4800
4801 /* Restart data transmission */
4802 l2cap_ertm_send(chan);
4803}
4804
a514b17f
AE		 4805/* Invoke with locked chan */
4806void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 4807{
770bfefa 4808 u8 local_amp_id = chan->local_amp_id;
fffadc08 4809 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 4810
8eb200bd
MM		 4811 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4812 chan, result, local_amp_id, remote_amp_id);
4813
8eb200bd
MM		 4814 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4815 l2cap_chan_unlock(chan);
4816 return;
4817 }
4818
4819 if (chan->state != BT_CONNECTED) {
4820 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4821 } else if (result != L2CAP_MR_SUCCESS) {
4822 l2cap_do_move_cancel(chan, result);
4823 } else {
4824 switch (chan->move_role) {
4825 case L2CAP_MOVE_ROLE_INITIATOR:
4826 l2cap_do_move_initiate(chan, local_amp_id,
4827 remote_amp_id);
4828 break;
4829 case L2CAP_MOVE_ROLE_RESPONDER:
4830 l2cap_do_move_respond(chan, result);
4831 break;
4832 default:
4833 l2cap_do_move_cancel(chan, result);
4834 break;
4835 }
4836 }
8eb200bd
MM		 4837}
4838
8d5a04a1 4839static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 4840 struct l2cap_cmd_hdr *cmd,
4841 u16 cmd_len, void *data)
8d5a04a1
MM		 4842{
4843 struct l2cap_move_chan_req *req = data;
1500109b 4844 struct l2cap_move_chan_rsp rsp;
02b0fbb9 4845 struct l2cap_chan *chan;
8d5a04a1
MM		 4846 u16 icid = 0;
4847 u16 result = L2CAP_MR_NOT_ALLOWED;
4848
4849 if (cmd_len != sizeof(*req))
4850 return -EPROTO;
4851
4852 icid = le16_to_cpu(req->icid);
4853
ad0ac6ca 4854 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 4855
848566b3 4856 if (!conn->hs_enabled)
8d5a04a1
MM		 4857 return -EINVAL;
4858
02b0fbb9
MM		 4859 chan = l2cap_get_chan_by_dcid(conn, icid);
4860 if (!chan) {
1500109b
MM		 4861 rsp.icid = cpu_to_le16(icid);
4862 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4863 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4864 sizeof(rsp), &rsp);
02b0fbb9
MM		 4865 return 0;
4866 }
4867
1500109b
MM		 4868 chan->ident = cmd->ident;
4869
02b0fbb9
MM		 4870 if (chan->scid < L2CAP_CID_DYN_START ||
4871 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4872 (chan->mode != L2CAP_MODE_ERTM &&
4873 chan->mode != L2CAP_MODE_STREAMING)) {
4874 result = L2CAP_MR_NOT_ALLOWED;
4875 goto send_move_response;
4876 }
4877
4878 if (chan->local_amp_id == req->dest_amp_id) {
4879 result = L2CAP_MR_SAME_ID;
4880 goto send_move_response;
4881 }
4882
6ed971ca 4883 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 4884 struct hci_dev *hdev;
4885 hdev = hci_dev_get(req->dest_amp_id);
4886 if (!hdev || hdev->dev_type != HCI_AMP ||
4887 !test_bit(HCI_UP, &hdev->flags)) {
4888 if (hdev)
4889 hci_dev_put(hdev);
4890
4891 result = L2CAP_MR_BAD_ID;
4892 goto send_move_response;
4893 }
4894 hci_dev_put(hdev);
4895 }
4896
4897 /* Detect a move collision. Only send a collision response
4898 * if this side has "lost", otherwise proceed with the move.
4899 * The winner has the larger bd_addr.
4900 */
4901 if ((__chan_is_moving(chan) ||
4902 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 4903 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 4904 result = L2CAP_MR_COLLISION;
4905 goto send_move_response;
4906 }
4907
02b0fbb9
MM		 4908 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4909 l2cap_move_setup(chan);
4910 chan->move_id = req->dest_amp_id;
4911 icid = chan->dcid;
4912
6ed971ca 4913 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 4914 /* Moving to BR/EDR */
4915 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4916 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4917 result = L2CAP_MR_PEND;
4918 } else {
4919 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4920 result = L2CAP_MR_SUCCESS;
4921 }
4922 } else {
4923 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4924 /* Placeholder - uncomment when amp functions are available */
4925 /*amp_accept_physical(chan, req->dest_amp_id);*/
4926 result = L2CAP_MR_PEND;
4927 }
4928
4929send_move_response:
1500109b 4930 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 4931
02b0fbb9
MM		 4932 l2cap_chan_unlock(chan);
4933
8d5a04a1
MM		 4934 return 0;
4935}
4936
5b155ef9
MM		 4937static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4938{
4939 struct l2cap_chan *chan;
4940 struct hci_chan *hchan = NULL;
4941
4942 chan = l2cap_get_chan_by_scid(conn, icid);
4943 if (!chan) {
4944 l2cap_send_move_chan_cfm_icid(conn, icid);
4945 return;
4946 }
4947
4948 __clear_chan_timer(chan);
4949 if (result == L2CAP_MR_PEND)
4950 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4951
4952 switch (chan->move_state) {
4953 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4954 /* Move confirm will be sent when logical link
4955 * is complete.
4956 */
4957 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4958 break;
4959 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4960 if (result == L2CAP_MR_PEND) {
4961 break;
4962 } else if (test_bit(CONN_LOCAL_BUSY,
4963 &chan->conn_state)) {
4964 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4965 } else {
4966 /* Logical link is up or moving to BR/EDR,
4967 * proceed with move
4968 */
4969 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4970 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4971 }
4972 break;
4973 case L2CAP_MOVE_WAIT_RSP:
4974 /* Moving to AMP */
4975 if (result == L2CAP_MR_SUCCESS) {
4976 /* Remote is ready, send confirm immediately
4977 * after logical link is ready
4978 */
4979 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4980 } else {
4981 /* Both logical link and move success
4982 * are required to confirm
4983 */
4984 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4985 }
4986
4987 /* Placeholder - get hci_chan for logical link */
4988 if (!hchan) {
4989 /* Logical link not available */
4990 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4991 break;
4992 }
4993
4994 /* If the logical link is not yet connected, do not
4995 * send confirmation.
4996 */
4997 if (hchan->state != BT_CONNECTED)
4998 break;
4999
5000 /* Logical link is already ready to go */
5001
5002 chan->hs_hcon = hchan->conn;
5003 chan->hs_hcon->l2cap_data = chan->conn;
5004
5005 if (result == L2CAP_MR_SUCCESS) {
5006 /* Can confirm now */
5007 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5008 } else {
5009 /* Now only need move success
5010 * to confirm
5011 */
5012 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5013 }
5014
5015 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5016 break;
5017 default:
5018 /* Any other amp move state means the move failed. */
5019 chan->move_id = chan->local_amp_id;
5020 l2cap_move_done(chan);
5021 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5022 }
5023
5024 l2cap_chan_unlock(chan);
5025}
5026
5027static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5028 u16 result)
5029{
5030 struct l2cap_chan *chan;
5031
5032 chan = l2cap_get_chan_by_ident(conn, ident);
5033 if (!chan) {
5034 /* Could not locate channel, icid is best guess */
5035 l2cap_send_move_chan_cfm_icid(conn, icid);
5036 return;
5037 }
5038
5039 __clear_chan_timer(chan);
5040
5041 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5042 if (result == L2CAP_MR_COLLISION) {
5043 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5044 } else {
5045 /* Cleanup - cancel move */
5046 chan->move_id = chan->local_amp_id;
5047 l2cap_move_done(chan);
5048 }
5049 }
5050
5051 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5052
5053 l2cap_chan_unlock(chan);
5054}
5055
5056static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5057 struct l2cap_cmd_hdr *cmd,
5058 u16 cmd_len, void *data)
8d5a04a1
MM		 5059{
5060 struct l2cap_move_chan_rsp *rsp = data;
5061 u16 icid, result;
5062
5063 if (cmd_len != sizeof(*rsp))
5064 return -EPROTO;
5065
5066 icid = le16_to_cpu(rsp->icid);
5067 result = le16_to_cpu(rsp->result);
5068
ad0ac6ca 5069 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5070
5b155ef9
MM		 5071 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5072 l2cap_move_continue(conn, icid, result);
5073 else
5074 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5075
5076 return 0;
5077}
5078
5f3847a4
MM		 5079static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5080 struct l2cap_cmd_hdr *cmd,
5081 u16 cmd_len, void *data)
8d5a04a1
MM		 5082{
5083 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5084 struct l2cap_chan *chan;
8d5a04a1
MM		 5085 u16 icid, result;
5086
5087 if (cmd_len != sizeof(*cfm))
5088 return -EPROTO;
5089
5090 icid = le16_to_cpu(cfm->icid);
5091 result = le16_to_cpu(cfm->result);
5092
ad0ac6ca 5093 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5094
5f3847a4
MM		 5095 chan = l2cap_get_chan_by_dcid(conn, icid);
5096 if (!chan) {
5097 /* Spec requires a response even if the icid was not found */
5098 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5099 return 0;
5100 }
5101
5102 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5103 if (result == L2CAP_MC_CONFIRMED) {
5104 chan->local_amp_id = chan->move_id;
6ed971ca 5105 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5106 __release_logical_link(chan);
5107 } else {
5108 chan->move_id = chan->local_amp_id;
5109 }
5110
5111 l2cap_move_done(chan);
5112 }
5113
8d5a04a1
MM		 5114 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5115
5f3847a4
MM		 5116 l2cap_chan_unlock(chan);
5117
8d5a04a1
MM		 5118 return 0;
5119}
5120
5121static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5122 struct l2cap_cmd_hdr *cmd,
5123 u16 cmd_len, void *data)
8d5a04a1
MM		 5124{
5125 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5126 struct l2cap_chan *chan;
8d5a04a1
MM		 5127 u16 icid;
5128
5129 if (cmd_len != sizeof(*rsp))
5130 return -EPROTO;
5131
5132 icid = le16_to_cpu(rsp->icid);
5133
ad0ac6ca 5134 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5135
3fd71a0a
MM		 5136 chan = l2cap_get_chan_by_scid(conn, icid);
5137 if (!chan)
5138 return 0;
5139
5140 __clear_chan_timer(chan);
5141
5142 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5143 chan->local_amp_id = chan->move_id;
5144
6ed971ca 5145 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5146 __release_logical_link(chan);
5147
5148 l2cap_move_done(chan);
5149 }
5150
5151 l2cap_chan_unlock(chan);
5152
8d5a04a1
MM		 5153 return 0;
5154}
5155
e2174ca4 5156static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 5157 u16 to_multiplier)
de73115a
CT		 5158{
5159 u16 max_latency;
5160
5161 if (min > max || min < 6 || max > 3200)
5162 return -EINVAL;
5163
5164 if (to_multiplier < 10 || to_multiplier > 3200)
5165 return -EINVAL;
5166
5167 if (max >= to_multiplier * 8)
5168 return -EINVAL;
5169
5170 max_latency = (to_multiplier * 8 / max) - 1;
5171 if (latency > 499 || latency > max_latency)
5172 return -EINVAL;
5173
5174 return 0;
5175}
5176
5177static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5178 struct l2cap_cmd_hdr *cmd,
203e639e 5179 u16 cmd_len, u8 *data)
de73115a
CT		 5180{
5181 struct hci_conn *hcon = conn->hcon;
5182 struct l2cap_conn_param_update_req *req;
5183 struct l2cap_conn_param_update_rsp rsp;
203e639e 5184 u16 min, max, latency, to_multiplier;
2ce603eb 5185 int err;
de73115a
CT		 5186
5187 if (!(hcon->link_mode & HCI_LM_MASTER))
5188 return -EINVAL;
5189
de73115a
CT		 5190 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5191 return -EPROTO;
5192
5193 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5194 min = __le16_to_cpu(req->min);
5195 max = __le16_to_cpu(req->max);
de73115a
CT		 5196 latency = __le16_to_cpu(req->latency);
5197 to_multiplier = __le16_to_cpu(req->to_multiplier);
5198
5199 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5200 min, max, latency, to_multiplier);
de73115a
CT		 5201
5202 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5203
5204 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5205 if (err)
ac73498c 5206 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5207 else
ac73498c 5208 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5209
5210 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5211 sizeof(rsp), &rsp);
de73115a 5212
2ce603eb
CT		 5213 if (!err)
5214 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5215
de73115a
CT		 5216 return 0;
5217}
5218
f1496dee
JH		 5219static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5220 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5221 u8 *data)
5222{
5223 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5224 u16 dcid, mtu, mps, credits, result;
5225 struct l2cap_chan *chan;
5226 int err;
5227
5228 if (cmd_len < sizeof(*rsp))
5229 return -EPROTO;
5230
5231 dcid = __le16_to_cpu(rsp->dcid);
5232 mtu = __le16_to_cpu(rsp->mtu);
5233 mps = __le16_to_cpu(rsp->mps);
5234 credits = __le16_to_cpu(rsp->credits);
5235 result = __le16_to_cpu(rsp->result);
5236
5237 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5238 return -EPROTO;
5239
5240 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5241 dcid, mtu, mps, credits, result);
5242
5243 mutex_lock(&conn->chan_lock);
5244
5245 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5246 if (!chan) {
5247 err = -EBADSLT;
5248 goto unlock;
5249 }
5250
5251 err = 0;
5252
5253 l2cap_chan_lock(chan);
5254
5255 switch (result) {
5256 case L2CAP_CR_SUCCESS:
5257 chan->ident = 0;
5258 chan->dcid = dcid;
5259 chan->omtu = mtu;
5260 chan->remote_mps = mps;
0cd75f7e 5261 chan->tx_credits = credits;
f1496dee
JH		 5262 l2cap_chan_ready(chan);
5263 break;
5264
5265 default:
5266 l2cap_chan_del(chan, ECONNREFUSED);
5267 break;
5268 }
5269
5270 l2cap_chan_unlock(chan);
5271
5272unlock:
5273 mutex_unlock(&conn->chan_lock);
5274
5275 return err;
5276}
5277
3300d9a9 5278static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5279 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5280 u8 *data)
3300d9a9
CT		 5281{
5282 int err = 0;
5283
5284 switch (cmd->code) {
5285 case L2CAP_COMMAND_REJ:
cb3b3152 5286 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5287 break;
5288
5289 case L2CAP_CONN_REQ:
cb3b3152 5290 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5291 break;
5292
5293 case L2CAP_CONN_RSP:
f5a2598d 5294 case L2CAP_CREATE_CHAN_RSP:
9245e737 5295 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5296 break;
5297
5298 case L2CAP_CONF_REQ:
5299 err = l2cap_config_req(conn, cmd, cmd_len, data);
5300 break;
5301
5302 case L2CAP_CONF_RSP:
9245e737 5303 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5304 break;
5305
5306 case L2CAP_DISCONN_REQ:
cb3b3152 5307 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5308 break;
5309
5310 case L2CAP_DISCONN_RSP:
9245e737 5311 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5312 break;
5313
5314 case L2CAP_ECHO_REQ:
5315 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5316 break;
5317
5318 case L2CAP_ECHO_RSP:
5319 break;
5320
5321 case L2CAP_INFO_REQ:
cb3b3152 5322 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5323 break;
5324
5325 case L2CAP_INFO_RSP:
9245e737 5326 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5327 break;
5328
f94ff6ff
MM		 5329 case L2CAP_CREATE_CHAN_REQ:
5330 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5331 break;
5332
8d5a04a1
MM		 5333 case L2CAP_MOVE_CHAN_REQ:
5334 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5335 break;
5336
5337 case L2CAP_MOVE_CHAN_RSP:
9245e737 5338 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5339 break;
5340
5341 case L2CAP_MOVE_CHAN_CFM:
5342 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5343 break;
5344
5345 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5346 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5347 break;
5348
3300d9a9
CT		 5349 default:
5350 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5351 err = -EINVAL;
5352 break;
5353 }
5354
5355 return err;
5356}
5357
27e2d4c8
JH		 5358static int l2cap_le_connect_req(struct l2cap_conn *conn,
5359 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5360 u8 *data)
5361{
5362 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5363 struct l2cap_le_conn_rsp rsp;
5364 struct l2cap_chan *chan, *pchan;
0cd75f7e 5365 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5366 __le16 psm;
5367 u8 result;
5368
5369 if (cmd_len != sizeof(*req))
5370 return -EPROTO;
5371
5372 scid = __le16_to_cpu(req->scid);
5373 mtu = __le16_to_cpu(req->mtu);
5374 mps = __le16_to_cpu(req->mps);
5375 psm = req->psm;
5376 dcid = 0;
0cd75f7e 5377 credits = 0;
27e2d4c8
JH		 5378
5379 if (mtu < 23 || mps < 23)
5380 return -EPROTO;
5381
5382 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5383 scid, mtu, mps);
5384
5385 /* Check if we have socket listening on psm */
5386 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5387 &conn->hcon->dst, LE_LINK);
5388 if (!pchan) {
5389 result = L2CAP_CR_BAD_PSM;
5390 chan = NULL;
5391 goto response;
5392 }
5393
5394 mutex_lock(&conn->chan_lock);
5395 l2cap_chan_lock(pchan);
5396
5397 if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
5398 result = L2CAP_CR_AUTHENTICATION;
5399 chan = NULL;
5400 goto response_unlock;
5401 }
5402
5403 /* Check if we already have channel with that dcid */
5404 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5405 result = L2CAP_CR_NO_MEM;
5406 chan = NULL;
5407 goto response_unlock;
5408 }
5409
5410 chan = pchan->ops->new_connection(pchan);
5411 if (!chan) {
5412 result = L2CAP_CR_NO_MEM;
5413 goto response_unlock;
5414 }
5415
0ce43ce6
JH		 5416 l2cap_le_flowctl_init(chan);
5417
27e2d4c8
JH		 5418 bacpy(&chan->src, &conn->hcon->src);
5419 bacpy(&chan->dst, &conn->hcon->dst);
5420 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
5421 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
5422 chan->psm = psm;
5423 chan->dcid = scid;
5424 chan->omtu = mtu;
5425 chan->remote_mps = mps;
0cd75f7e 5426 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5427
5428 __l2cap_chan_add(conn, chan);
5429 dcid = chan->scid;
0cd75f7e 5430 credits = chan->rx_credits;
27e2d4c8
JH		 5431
5432 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5433
5434 chan->ident = cmd->ident;
5435
5436 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5437 l2cap_state_change(chan, BT_CONNECT2);
5438 result = L2CAP_CR_PEND;
5439 chan->ops->defer(chan);
5440 } else {
5441 l2cap_chan_ready(chan);
5442 result = L2CAP_CR_SUCCESS;
5443 }
5444
5445response_unlock:
5446 l2cap_chan_unlock(pchan);
5447 mutex_unlock(&conn->chan_lock);
5448
5449 if (result == L2CAP_CR_PEND)
5450 return 0;
5451
5452response:
5453 if (chan) {
5454 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5455 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5456 } else {
5457 rsp.mtu = 0;
5458 rsp.mps = 0;
5459 }
5460
5461 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5462 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5463 rsp.result = cpu_to_le16(result);
5464
5465 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5466
5467 return 0;
5468}
5469
fad5fc89
JH		 5470static inline int l2cap_le_credits(struct l2cap_conn *conn,
5471 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5472 u8 *data)
5473{
5474 struct l2cap_le_credits *pkt;
5475 struct l2cap_chan *chan;
5476 u16 cid, credits;
5477
5478 if (cmd_len != sizeof(*pkt))
5479 return -EPROTO;
5480
5481 pkt = (struct l2cap_le_credits *) data;
5482 cid = __le16_to_cpu(pkt->cid);
5483 credits = __le16_to_cpu(pkt->credits);
5484
5485 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5486
5487 chan = l2cap_get_chan_by_dcid(conn, cid);
5488 if (!chan)
5489 return -EBADSLT;
5490
5491 chan->tx_credits += credits;
5492
5493 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5494 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5495 chan->tx_credits--;
5496 }
5497
5498 if (chan->tx_credits)
5499 chan->ops->resume(chan);
5500
5501 l2cap_chan_unlock(chan);
5502
5503 return 0;
5504}
5505
71fb4197
JH		 5506static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5507 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5508 u8 *data)
5509{
5510 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5511 struct l2cap_chan *chan;
5512
5513 if (cmd_len < sizeof(*rej))
5514 return -EPROTO;
5515
5516 mutex_lock(&conn->chan_lock);
5517
5518 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5519 if (!chan)
5520 goto done;
5521
5522 l2cap_chan_lock(chan);
5523 l2cap_chan_del(chan, ECONNREFUSED);
5524 l2cap_chan_unlock(chan);
5525
5526done:
5527 mutex_unlock(&conn->chan_lock);
5528 return 0;
5529}
5530
3300d9a9 5531static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5532 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5533 u8 *data)
3300d9a9 5534{
b5ecba64
JH		 5535 int err = 0;
5536
3af8ace6
JH		 5537 if (!enable_lecoc) {
5538 switch (cmd->code) {
5539 case L2CAP_LE_CONN_REQ:
5540 case L2CAP_LE_CONN_RSP:
5541 case L2CAP_LE_CREDITS:
5542 case L2CAP_DISCONN_REQ:
5543 case L2CAP_DISCONN_RSP:
5544 return -EINVAL;
5545 }
5546 }
5547
3300d9a9
CT		 5548 switch (cmd->code) {
5549 case L2CAP_COMMAND_REJ:
71fb4197 5550 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5551 break;
3300d9a9
CT		 5552
5553 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5554 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5555 break;
3300d9a9
CT		 5556
5557 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5558 break;
3300d9a9 5559
f1496dee
JH		 5560 case L2CAP_LE_CONN_RSP:
5561 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5562 break;
f1496dee 5563
27e2d4c8 5564 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5565 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5566 break;
27e2d4c8 5567
fad5fc89
JH		 5568 case L2CAP_LE_CREDITS:
5569 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5570 break;
5571
3defe01a 5572 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5573 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5574 break;
3defe01a
JH		 5575
5576 case L2CAP_DISCONN_RSP:
5577 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5578 break;
3defe01a 5579
3300d9a9
CT		 5580 default:
5581 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5582 err = -EINVAL;
5583 break;
3300d9a9 5584 }
b5ecba64
JH		 5585
5586 return err;
3300d9a9
CT		 5587}
5588
c5623556
JH		 5589static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5590 struct sk_buff *skb)
5591{
69c4e4e8 5592 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5593 struct l2cap_cmd_hdr *cmd;
5594 u16 len;
c5623556
JH		 5595 int err;
5596
69c4e4e8 5597 if (hcon->type != LE_LINK)
3b166295 5598 goto drop;
69c4e4e8 5599
4f3e219d
MH		 5600 if (skb->len < L2CAP_CMD_HDR_SIZE)
5601 goto drop;
c5623556 5602
4f3e219d
MH		 5603 cmd = (void *) skb->data;
5604 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5605
4f3e219d 5606 len = le16_to_cpu(cmd->len);
c5623556 5607
4f3e219d 5608 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5609
4f3e219d
MH		 5610 if (len != skb->len || !cmd->ident) {
5611 BT_DBG("corrupted command");
5612 goto drop;
5613 }
c5623556 5614
203e639e 5615 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5616 if (err) {
5617 struct l2cap_cmd_rej_unk rej;
c5623556 5618
4f3e219d 5619 BT_ERR("Wrong link type (%d)", err);
c5623556 5620
a521149a 5621 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5622 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5623 sizeof(rej), &rej);
c5623556
JH		 5624 }
5625
3b166295 5626drop:
c5623556
JH		 5627 kfree_skb(skb);
5628}
5629
3300d9a9 5630static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5631 struct sk_buff *skb)
1da177e4 5632{
69c4e4e8 5633 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5634 u8 *data = skb->data;
5635 int len = skb->len;
5636 struct l2cap_cmd_hdr cmd;
3300d9a9 5637 int err;
1da177e4
LT		 5638
5639 l2cap_raw_recv(conn, skb);
5640
69c4e4e8 5641 if (hcon->type != ACL_LINK)
3b166295 5642 goto drop;
69c4e4e8 5643
1da177e4 5644 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5645 u16 cmd_len;
1da177e4
LT		 5646 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5647 data += L2CAP_CMD_HDR_SIZE;
5648 len -= L2CAP_CMD_HDR_SIZE;
5649
88219a0f 5650 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5651
2d792818
GP		 5652 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5653 cmd.ident);
1da177e4 5654
88219a0f 5655 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5656 BT_DBG("corrupted command");
5657 break;
5658 }
5659
c5623556 5660 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5661 if (err) {
e2fd318e 5662 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5663
5664 BT_ERR("Wrong link type (%d)", err);
1da177e4 5665
a521149a 5666 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5667 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5668 sizeof(rej), &rej);
1da177e4
LT		 5669 }
5670
88219a0f
AV		 5671 data += cmd_len;
5672 len -= cmd_len;
1da177e4
LT		 5673 }
5674
3b166295 5675drop:
1da177e4
LT		 5676 kfree_skb(skb);
5677}
5678
47d1ec61 5679static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5680{
5681 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5682 int hdr_size;
5683
5684 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5685 hdr_size = L2CAP_EXT_HDR_SIZE;
5686 else
5687 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5688
47d1ec61 5689 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5690 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5691 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5692 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5693
5694 if (our_fcs != rcv_fcs)
7a560e5c 5695 return -EBADMSG;
fcc203c3
GP		 5696 }
5697 return 0;
5698}
5699
6ea00485 5700static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5701{
e31f7633 5702 struct l2cap_ctrl control;
d5392c8f 5703
e31f7633 5704 BT_DBG("chan %p", chan);
d5392c8f 5705
e31f7633
MM		 5706 memset(&control, 0, sizeof(control));
5707 control.sframe = 1;
5708 control.final = 1;
5709 control.reqseq = chan->buffer_seq;
5710 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5711
e2ab4353 5712 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5713 control.super = L2CAP_SUPER_RNR;
5714 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5715 }
5716
e31f7633
MM		 5717 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5718 chan->unacked_frames > 0)
5719 __set_retrans_timer(chan);
d5392c8f 5720
e31f7633 5721 /* Send pending iframes */
525cd185 5722 l2cap_ertm_send(chan);
d5392c8f 5723
e2ab4353 5724 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5725 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5726 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5727 * send it now.
5728 */
5729 control.super = L2CAP_SUPER_RR;
5730 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5731 }
5732}
5733
2d792818
GP		 5734static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5735 struct sk_buff **last_frag)
18778a63 5736{
84084a31
MM		 5737 /* skb->len reflects data in skb as well as all fragments
5738 * skb->data_len reflects only data in fragments
5739 */
5740 if (!skb_has_frag_list(skb))
5741 skb_shinfo(skb)->frag_list = new_frag;
5742
5743 new_frag->next = NULL;
5744
5745 (*last_frag)->next = new_frag;
5746 *last_frag = new_frag;
5747
5748 skb->len += new_frag->len;
5749 skb->data_len += new_frag->len;
5750 skb->truesize += new_frag->truesize;
5751}
5752
4b51dae9
MM		 5753static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5754 struct l2cap_ctrl *control)
84084a31
MM		 5755{
5756 int err = -EINVAL;
18778a63 5757
4b51dae9 5758 switch (control->sar) {
7e0ef6ee 5759 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5760 if (chan->sdu)
5761 break;
18778a63 5762
80b98027 5763 err = chan->ops->recv(chan, skb);
84084a31 5764 break;
18778a63 5765
7e0ef6ee 5766 case L2CAP_SAR_START:
84084a31
MM		 5767 if (chan->sdu)
5768 break;
18778a63 5769
6f61fd47 5770 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 5771 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 5772
84084a31
MM		 5773 if (chan->sdu_len > chan->imtu) {
5774 err = -EMSGSIZE;
5775 break;
5776 }
1890d36b 5777
84084a31
MM		 5778 if (skb->len >= chan->sdu_len)
5779 break;
18778a63 5780
84084a31
MM		 5781 chan->sdu = skb;
5782 chan->sdu_last_frag = skb;
18778a63 5783
84084a31
MM		 5784 skb = NULL;
5785 err = 0;
18778a63
GP		 5786 break;
5787
7e0ef6ee 5788 case L2CAP_SAR_CONTINUE:
6f61fd47 5789 if (!chan->sdu)
84084a31 5790 break;
18778a63 5791
84084a31
MM		 5792 append_skb_frag(chan->sdu, skb,
5793 &chan->sdu_last_frag);
5794 skb = NULL;
18778a63 5795
84084a31
MM		 5796 if (chan->sdu->len >= chan->sdu_len)
5797 break;
4178ba46 5798
84084a31 5799 err = 0;
18778a63
GP		 5800 break;
5801
7e0ef6ee 5802 case L2CAP_SAR_END:
6f61fd47 5803 if (!chan->sdu)
84084a31 5804 break;
18778a63 5805
84084a31
MM		 5806 append_skb_frag(chan->sdu, skb,
5807 &chan->sdu_last_frag);
5808 skb = NULL;
4178ba46 5809
84084a31
MM		 5810 if (chan->sdu->len != chan->sdu_len)
5811 break;
18778a63 5812
80b98027 5813 err = chan->ops->recv(chan, chan->sdu);
1890d36b 5814
84084a31
MM		 5815 if (!err) {
5816 /* Reassembly complete */
5817 chan->sdu = NULL;
5818 chan->sdu_last_frag = NULL;
5819 chan->sdu_len = 0;
1890d36b 5820 }
18778a63
GP		 5821 break;
5822 }
5823
84084a31
MM		 5824 if (err) {
5825 kfree_skb(skb);
5826 kfree_skb(chan->sdu);
5827 chan->sdu = NULL;
5828 chan->sdu_last_frag = NULL;
5829 chan->sdu_len = 0;
5830 }
18778a63 5831
84084a31 5832 return err;
18778a63
GP		 5833}
5834
32b32735
MM		 5835static int l2cap_resegment(struct l2cap_chan *chan)
5836{
5837 /* Placeholder */
5838 return 0;
5839}
5840
61aa4f5b 5841void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 5842{
61aa4f5b 5843 u8 event;
712132eb 5844
61aa4f5b
MM		 5845 if (chan->mode != L2CAP_MODE_ERTM)
5846 return;
712132eb 5847
61aa4f5b 5848 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 5849 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 5850}
5851
d2a7ac5d
MM		 5852static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5853{
63838725
MM		 5854 int err = 0;
5855 /* Pass sequential frames to l2cap_reassemble_sdu()
5856 * until a gap is encountered.
5857 */
5858
5859 BT_DBG("chan %p", chan);
5860
5861 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5862 struct sk_buff *skb;
5863 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5864 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5865
5866 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5867
5868 if (!skb)
5869 break;
5870
5871 skb_unlink(skb, &chan->srej_q);
5872 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5873 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5874 if (err)
5875 break;
5876 }
5877
5878 if (skb_queue_empty(&chan->srej_q)) {
5879 chan->rx_state = L2CAP_RX_STATE_RECV;
5880 l2cap_send_ack(chan);
5881 }
5882
5883 return err;
d2a7ac5d
MM		 5884}
5885
5886static void l2cap_handle_srej(struct l2cap_chan *chan,
5887 struct l2cap_ctrl *control)
5888{
f80842a8
MM		 5889 struct sk_buff *skb;
5890
5891 BT_DBG("chan %p, control %p", chan, control);
5892
5893 if (control->reqseq == chan->next_tx_seq) {
5894 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5895 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5896 return;
5897 }
5898
5899 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5900
5901 if (skb == NULL) {
5902 BT_DBG("Seq %d not available for retransmission",
5903 control->reqseq);
5904 return;
5905 }
5906
5907 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5908 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5909 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 5910 return;
5911 }
5912
5913 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5914
5915 if (control->poll) {
5916 l2cap_pass_to_tx(chan, control);
5917
5918 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5919 l2cap_retransmit(chan, control);
5920 l2cap_ertm_send(chan);
5921
5922 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5923 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5924 chan->srej_save_reqseq = control->reqseq;
5925 }
5926 } else {
5927 l2cap_pass_to_tx_fbit(chan, control);
5928
5929 if (control->final) {
5930 if (chan->srej_save_reqseq != control->reqseq ||
5931 !test_and_clear_bit(CONN_SREJ_ACT,
5932 &chan->conn_state))
5933 l2cap_retransmit(chan, control);
5934 } else {
5935 l2cap_retransmit(chan, control);
5936 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5937 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5938 chan->srej_save_reqseq = control->reqseq;
5939 }
5940 }
5941 }
d2a7ac5d
MM		 5942}
5943
5944static void l2cap_handle_rej(struct l2cap_chan *chan,
5945 struct l2cap_ctrl *control)
5946{
fcd289df
MM		 5947 struct sk_buff *skb;
5948
5949 BT_DBG("chan %p, control %p", chan, control);
5950
5951 if (control->reqseq == chan->next_tx_seq) {
5952 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 5953 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5954 return;
5955 }
5956
5957 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5958
5959 if (chan->max_tx && skb &&
5960 bt_cb(skb)->control.retries >= chan->max_tx) {
5961 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 5962 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 5963 return;
5964 }
5965
5966 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5967
5968 l2cap_pass_to_tx(chan, control);
5969
5970 if (control->final) {
5971 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5972 l2cap_retransmit_all(chan, control);
5973 } else {
5974 l2cap_retransmit_all(chan, control);
5975 l2cap_ertm_send(chan);
5976 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5977 set_bit(CONN_REJ_ACT, &chan->conn_state);
5978 }
d2a7ac5d
MM		 5979}
5980
4b51dae9
MM		 5981static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5982{
5983 BT_DBG("chan %p, txseq %d", chan, txseq);
5984
5985 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5986 chan->expected_tx_seq);
5987
5988 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5989 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 5990 chan->tx_win) {
4b51dae9
MM		 5991 /* See notes below regarding "double poll" and
5992 * invalid packets.
5993 */
5994 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5995 BT_DBG("Invalid/Ignore - after SREJ");
5996 return L2CAP_TXSEQ_INVALID_IGNORE;
5997 } else {
5998 BT_DBG("Invalid - in window after SREJ sent");
5999 return L2CAP_TXSEQ_INVALID;
6000 }
6001 }
6002
6003 if (chan->srej_list.head == txseq) {
6004 BT_DBG("Expected SREJ");
6005 return L2CAP_TXSEQ_EXPECTED_SREJ;
6006 }
6007
6008 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6009 BT_DBG("Duplicate SREJ - txseq already stored");
6010 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6011 }
6012
6013 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6014 BT_DBG("Unexpected SREJ - not requested");
6015 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6016 }
6017 }
6018
6019 if (chan->expected_tx_seq == txseq) {
6020 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6021 chan->tx_win) {
6022 BT_DBG("Invalid - txseq outside tx window");
6023 return L2CAP_TXSEQ_INVALID;
6024 } else {
6025 BT_DBG("Expected");
6026 return L2CAP_TXSEQ_EXPECTED;
6027 }
6028 }
6029
6030 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6031 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6032 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6033 return L2CAP_TXSEQ_DUPLICATE;
6034 }
6035
6036 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6037 /* A source of invalid packets is a "double poll" condition,
6038 * where delays cause us to send multiple poll packets. If
6039 * the remote stack receives and processes both polls,
6040 * sequence numbers can wrap around in such a way that a
6041 * resent frame has a sequence number that looks like new data
6042 * with a sequence gap. This would trigger an erroneous SREJ
6043 * request.
6044 *
6045 * Fortunately, this is impossible with a tx window that's
6046 * less than half of the maximum sequence number, which allows
6047 * invalid frames to be safely ignored.
6048 *
6049 * With tx window sizes greater than half of the tx window
6050 * maximum, the frame is invalid and cannot be ignored. This
6051 * causes a disconnect.
6052 */
6053
6054 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6055 BT_DBG("Invalid/Ignore - txseq outside tx window");
6056 return L2CAP_TXSEQ_INVALID_IGNORE;
6057 } else {
6058 BT_DBG("Invalid - txseq outside tx window");
6059 return L2CAP_TXSEQ_INVALID;
6060 }
6061 } else {
6062 BT_DBG("Unexpected - txseq indicates missing frames");
6063 return L2CAP_TXSEQ_UNEXPECTED;
6064 }
6065}
6066
d2a7ac5d
MM		 6067static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6068 struct l2cap_ctrl *control,
6069 struct sk_buff *skb, u8 event)
6070{
6071 int err = 0;
941247f9 6072 bool skb_in_use = false;
d2a7ac5d
MM		 6073
6074 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6075 event);
6076
6077 switch (event) {
6078 case L2CAP_EV_RECV_IFRAME:
6079 switch (l2cap_classify_txseq(chan, control->txseq)) {
6080 case L2CAP_TXSEQ_EXPECTED:
6081 l2cap_pass_to_tx(chan, control);
6082
6083 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6084 BT_DBG("Busy, discarding expected seq %d",
6085 control->txseq);
6086 break;
6087 }
6088
6089 chan->expected_tx_seq = __next_seq(chan,
6090 control->txseq);
6091
6092 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6093 skb_in_use = true;
d2a7ac5d
MM		 6094
6095 err = l2cap_reassemble_sdu(chan, skb, control);
6096 if (err)
6097 break;
6098
6099 if (control->final) {
6100 if (!test_and_clear_bit(CONN_REJ_ACT,
6101 &chan->conn_state)) {
6102 control->final = 0;
6103 l2cap_retransmit_all(chan, control);
6104 l2cap_ertm_send(chan);
6105 }
6106 }
6107
6108 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6109 l2cap_send_ack(chan);
6110 break;
6111 case L2CAP_TXSEQ_UNEXPECTED:
6112 l2cap_pass_to_tx(chan, control);
6113
6114 /* Can't issue SREJ frames in the local busy state.
6115 * Drop this frame, it will be seen as missing
6116 * when local busy is exited.
6117 */
6118 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6119 BT_DBG("Busy, discarding unexpected seq %d",
6120 control->txseq);
6121 break;
6122 }
6123
6124 /* There was a gap in the sequence, so an SREJ
6125 * must be sent for each missing frame. The
6126 * current frame is stored for later use.
6127 */
6128 skb_queue_tail(&chan->srej_q, skb);
941247f9 6129 skb_in_use = true;
d2a7ac5d
MM		 6130 BT_DBG("Queued %p (queue len %d)", skb,
6131 skb_queue_len(&chan->srej_q));
6132
6133 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6134 l2cap_seq_list_clear(&chan->srej_list);
6135 l2cap_send_srej(chan, control->txseq);
6136
6137 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6138 break;
6139 case L2CAP_TXSEQ_DUPLICATE:
6140 l2cap_pass_to_tx(chan, control);
6141 break;
6142 case L2CAP_TXSEQ_INVALID_IGNORE:
6143 break;
6144 case L2CAP_TXSEQ_INVALID:
6145 default:
5e4e3972 6146 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6147 break;
6148 }
6149 break;
6150 case L2CAP_EV_RECV_RR:
6151 l2cap_pass_to_tx(chan, control);
6152 if (control->final) {
6153 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6154
e6a3ee6e
MM		 6155 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6156 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6157 control->final = 0;
6158 l2cap_retransmit_all(chan, control);
6159 }
6160
6161 l2cap_ertm_send(chan);
6162 } else if (control->poll) {
6163 l2cap_send_i_or_rr_or_rnr(chan);
6164 } else {
6165 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6166 &chan->conn_state) &&
6167 chan->unacked_frames)
6168 __set_retrans_timer(chan);
6169
6170 l2cap_ertm_send(chan);
6171 }
6172 break;
6173 case L2CAP_EV_RECV_RNR:
6174 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6175 l2cap_pass_to_tx(chan, control);
6176 if (control && control->poll) {
6177 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6178 l2cap_send_rr_or_rnr(chan, 0);
6179 }
6180 __clear_retrans_timer(chan);
6181 l2cap_seq_list_clear(&chan->retrans_list);
6182 break;
6183 case L2CAP_EV_RECV_REJ:
6184 l2cap_handle_rej(chan, control);
6185 break;
6186 case L2CAP_EV_RECV_SREJ:
6187 l2cap_handle_srej(chan, control);
6188 break;
6189 default:
6190 break;
6191 }
6192
6193 if (skb && !skb_in_use) {
6194 BT_DBG("Freeing %p", skb);
6195 kfree_skb(skb);
6196 }
6197
6198 return err;
6199}
6200
6201static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6202 struct l2cap_ctrl *control,
6203 struct sk_buff *skb, u8 event)
6204{
6205 int err = 0;
6206 u16 txseq = control->txseq;
941247f9 6207 bool skb_in_use = false;
d2a7ac5d
MM		 6208
6209 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6210 event);
6211
6212 switch (event) {
6213 case L2CAP_EV_RECV_IFRAME:
6214 switch (l2cap_classify_txseq(chan, txseq)) {
6215 case L2CAP_TXSEQ_EXPECTED:
6216 /* Keep frame for reassembly later */
6217 l2cap_pass_to_tx(chan, control);
6218 skb_queue_tail(&chan->srej_q, skb);
941247f9 6219 skb_in_use = true;
d2a7ac5d
MM		 6220 BT_DBG("Queued %p (queue len %d)", skb,
6221 skb_queue_len(&chan->srej_q));
6222
6223 chan->expected_tx_seq = __next_seq(chan, txseq);
6224 break;
6225 case L2CAP_TXSEQ_EXPECTED_SREJ:
6226 l2cap_seq_list_pop(&chan->srej_list);
6227
6228 l2cap_pass_to_tx(chan, control);
6229 skb_queue_tail(&chan->srej_q, skb);
941247f9 6230 skb_in_use = true;
d2a7ac5d
MM		 6231 BT_DBG("Queued %p (queue len %d)", skb,
6232 skb_queue_len(&chan->srej_q));
6233
6234 err = l2cap_rx_queued_iframes(chan);
6235 if (err)
6236 break;
6237
6238 break;
6239 case L2CAP_TXSEQ_UNEXPECTED:
6240 /* Got a frame that can't be reassembled yet.
6241 * Save it for later, and send SREJs to cover
6242 * the missing frames.
6243 */
6244 skb_queue_tail(&chan->srej_q, skb);
941247f9 6245 skb_in_use = true;
d2a7ac5d
MM		 6246 BT_DBG("Queued %p (queue len %d)", skb,
6247 skb_queue_len(&chan->srej_q));
6248
6249 l2cap_pass_to_tx(chan, control);
6250 l2cap_send_srej(chan, control->txseq);
6251 break;
6252 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6253 /* This frame was requested with an SREJ, but
6254 * some expected retransmitted frames are
6255 * missing. Request retransmission of missing
6256 * SREJ'd frames.
6257 */
6258 skb_queue_tail(&chan->srej_q, skb);
941247f9 6259 skb_in_use = true;
d2a7ac5d
MM		 6260 BT_DBG("Queued %p (queue len %d)", skb,
6261 skb_queue_len(&chan->srej_q));
6262
6263 l2cap_pass_to_tx(chan, control);
6264 l2cap_send_srej_list(chan, control->txseq);
6265 break;
6266 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6267 /* We've already queued this frame. Drop this copy. */
6268 l2cap_pass_to_tx(chan, control);
6269 break;
6270 case L2CAP_TXSEQ_DUPLICATE:
6271 /* Expecting a later sequence number, so this frame
6272 * was already received. Ignore it completely.
6273 */
6274 break;
6275 case L2CAP_TXSEQ_INVALID_IGNORE:
6276 break;
6277 case L2CAP_TXSEQ_INVALID:
6278 default:
5e4e3972 6279 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6280 break;
6281 }
6282 break;
6283 case L2CAP_EV_RECV_RR:
6284 l2cap_pass_to_tx(chan, control);
6285 if (control->final) {
6286 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6287
6288 if (!test_and_clear_bit(CONN_REJ_ACT,
6289 &chan->conn_state)) {
6290 control->final = 0;
6291 l2cap_retransmit_all(chan, control);
6292 }
6293
6294 l2cap_ertm_send(chan);
6295 } else if (control->poll) {
6296 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6297 &chan->conn_state) &&
6298 chan->unacked_frames) {
6299 __set_retrans_timer(chan);
6300 }
6301
6302 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6303 l2cap_send_srej_tail(chan);
6304 } else {
6305 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6306 &chan->conn_state) &&
6307 chan->unacked_frames)
6308 __set_retrans_timer(chan);
6309
6310 l2cap_send_ack(chan);
6311 }
6312 break;
6313 case L2CAP_EV_RECV_RNR:
6314 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6315 l2cap_pass_to_tx(chan, control);
6316 if (control->poll) {
6317 l2cap_send_srej_tail(chan);
6318 } else {
6319 struct l2cap_ctrl rr_control;
6320 memset(&rr_control, 0, sizeof(rr_control));
6321 rr_control.sframe = 1;
6322 rr_control.super = L2CAP_SUPER_RR;
6323 rr_control.reqseq = chan->buffer_seq;
6324 l2cap_send_sframe(chan, &rr_control);
6325 }
6326
6327 break;
6328 case L2CAP_EV_RECV_REJ:
6329 l2cap_handle_rej(chan, control);
6330 break;
6331 case L2CAP_EV_RECV_SREJ:
6332 l2cap_handle_srej(chan, control);
6333 break;
6334 }
6335
6336 if (skb && !skb_in_use) {
6337 BT_DBG("Freeing %p", skb);
6338 kfree_skb(skb);
6339 }
6340
6341 return err;
6342}
6343
32b32735
MM		 6344static int l2cap_finish_move(struct l2cap_chan *chan)
6345{
6346 BT_DBG("chan %p", chan);
6347
6348 chan->rx_state = L2CAP_RX_STATE_RECV;
6349
6350 if (chan->hs_hcon)
6351 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6352 else
6353 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6354
6355 return l2cap_resegment(chan);
6356}
6357
6358static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6359 struct l2cap_ctrl *control,
6360 struct sk_buff *skb, u8 event)
6361{
6362 int err;
6363
6364 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6365 event);
6366
6367 if (!control->poll)
6368 return -EPROTO;
6369
6370 l2cap_process_reqseq(chan, control->reqseq);
6371
6372 if (!skb_queue_empty(&chan->tx_q))
6373 chan->tx_send_head = skb_peek(&chan->tx_q);
6374 else
6375 chan->tx_send_head = NULL;
6376
6377 /* Rewind next_tx_seq to the point expected
6378 * by the receiver.
6379 */
6380 chan->next_tx_seq = control->reqseq;
6381 chan->unacked_frames = 0;
6382
6383 err = l2cap_finish_move(chan);
6384 if (err)
6385 return err;
6386
6387 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6388 l2cap_send_i_or_rr_or_rnr(chan);
6389
6390 if (event == L2CAP_EV_RECV_IFRAME)
6391 return -EPROTO;
6392
6393 return l2cap_rx_state_recv(chan, control, NULL, event);
6394}
6395
6396static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6397 struct l2cap_ctrl *control,
6398 struct sk_buff *skb, u8 event)
6399{
6400 int err;
6401
6402 if (!control->final)
6403 return -EPROTO;
6404
6405 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6406
6407 chan->rx_state = L2CAP_RX_STATE_RECV;
6408 l2cap_process_reqseq(chan, control->reqseq);
6409
6410 if (!skb_queue_empty(&chan->tx_q))
6411 chan->tx_send_head = skb_peek(&chan->tx_q);
6412 else
6413 chan->tx_send_head = NULL;
6414
6415 /* Rewind next_tx_seq to the point expected
6416 * by the receiver.
6417 */
6418 chan->next_tx_seq = control->reqseq;
6419 chan->unacked_frames = 0;
6420
6421 if (chan->hs_hcon)
6422 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6423 else
6424 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6425
6426 err = l2cap_resegment(chan);
6427
6428 if (!err)
6429 err = l2cap_rx_state_recv(chan, control, skb, event);
6430
6431 return err;
6432}
6433
d2a7ac5d
MM		 6434static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6435{
6436 /* Make sure reqseq is for a packet that has been sent but not acked */
6437 u16 unacked;
6438
6439 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6440 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6441}
6442
cec8ab6e
MM		 6443static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6444 struct sk_buff *skb, u8 event)
218bb9df 6445{
d2a7ac5d
MM		 6446 int err = 0;
6447
6448 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6449 control, skb, event, chan->rx_state);
6450
6451 if (__valid_reqseq(chan, control->reqseq)) {
6452 switch (chan->rx_state) {
6453 case L2CAP_RX_STATE_RECV:
6454 err = l2cap_rx_state_recv(chan, control, skb, event);
6455 break;
6456 case L2CAP_RX_STATE_SREJ_SENT:
6457 err = l2cap_rx_state_srej_sent(chan, control, skb,
6458 event);
6459 break;
32b32735
MM		 6460 case L2CAP_RX_STATE_WAIT_P:
6461 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6462 break;
6463 case L2CAP_RX_STATE_WAIT_F:
6464 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6465 break;
d2a7ac5d
MM		 6466 default:
6467 /* shut it down */
6468 break;
6469 }
6470 } else {
6471 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6472 control->reqseq, chan->next_tx_seq,
6473 chan->expected_ack_seq);
5e4e3972 6474 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6475 }
6476
6477 return err;
cec8ab6e
MM		 6478}
6479
6480static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6481 struct sk_buff *skb)
6482{
4b51dae9
MM		 6483 int err = 0;
6484
6485 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6486 chan->rx_state);
6487
6488 if (l2cap_classify_txseq(chan, control->txseq) ==
6489 L2CAP_TXSEQ_EXPECTED) {
6490 l2cap_pass_to_tx(chan, control);
6491
6492 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6493 __next_seq(chan, chan->buffer_seq));
6494
6495 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6496
6497 l2cap_reassemble_sdu(chan, skb, control);
6498 } else {
6499 if (chan->sdu) {
6500 kfree_skb(chan->sdu);
6501 chan->sdu = NULL;
6502 }
6503 chan->sdu_last_frag = NULL;
6504 chan->sdu_len = 0;
6505
6506 if (skb) {
6507 BT_DBG("Freeing %p", skb);
6508 kfree_skb(skb);
6509 }
6510 }
6511
6512 chan->last_acked_seq = control->txseq;
6513 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6514
6515 return err;
cec8ab6e
MM		 6516}
6517
6518static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6519{
6520 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6521 u16 len;
6522 u8 event;
218bb9df 6523
b76bbd66
MM		 6524 __unpack_control(chan, skb);
6525
218bb9df
GP		 6526 len = skb->len;
6527
6528 /*
6529 * We can just drop the corrupted I-frame here.
6530 * Receiver will miss it and start proper recovery
cec8ab6e 6531 * procedures and ask for retransmission.
218bb9df 6532 */
47d1ec61 6533 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6534 goto drop;
6535
cec8ab6e 6536 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6537 len -= L2CAP_SDULEN_SIZE;
218bb9df 6538
47d1ec61 6539 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6540 len -= L2CAP_FCS_SIZE;
218bb9df 6541
47d1ec61 6542 if (len > chan->mps) {
5e4e3972 6543 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6544 goto drop;
6545 }
6546
cec8ab6e
MM		 6547 if (!control->sframe) {
6548 int err;
218bb9df 6549
cec8ab6e
MM		 6550 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6551 control->sar, control->reqseq, control->final,
6552 control->txseq);
218bb9df 6553
cec8ab6e
MM		 6554 /* Validate F-bit - F=0 always valid, F=1 only
6555 * valid in TX WAIT_F
6556 */
6557 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6558 goto drop;
cec8ab6e
MM		 6559
6560 if (chan->mode != L2CAP_MODE_STREAMING) {
6561 event = L2CAP_EV_RECV_IFRAME;
6562 err = l2cap_rx(chan, control, skb, event);
6563 } else {
6564 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6565 }
6566
cec8ab6e 6567 if (err)
5e4e3972 6568 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6569 } else {
cec8ab6e
MM		 6570 const u8 rx_func_to_event[4] = {
6571 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6572 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6573 };
6574
6575 /* Only I-frames are expected in streaming mode */
6576 if (chan->mode == L2CAP_MODE_STREAMING)
6577 goto drop;
6578
6579 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6580 control->reqseq, control->final, control->poll,
6581 control->super);
6582
218bb9df 6583 if (len != 0) {
1bb166e6 6584 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6585 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6586 goto drop;
6587 }
6588
cec8ab6e
MM		 6589 /* Validate F and P bits */
6590 if (control->final && (control->poll ||
6591 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6592 goto drop;
6593
6594 event = rx_func_to_event[control->super];
6595 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6596 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6597 }
6598
6599 return 0;
6600
6601drop:
6602 kfree_skb(skb);
6603 return 0;
6604}
6605
b1c325c2
JH		 6606static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6607{
6608 struct l2cap_conn *conn = chan->conn;
6609 struct l2cap_le_credits pkt;
6610 u16 return_credits;
6611
6612 /* We return more credits to the sender only after the amount of
6613 * credits falls below half of the initial amount.
6614 */
f15b8ecf 6615 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6616 return;
6617
f15b8ecf 6618 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6619
6620 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6621
6622 chan->rx_credits += return_credits;
6623
6624 pkt.cid = cpu_to_le16(chan->scid);
6625 pkt.credits = cpu_to_le16(return_credits);
6626
6627 chan->ident = l2cap_get_ident(conn);
6628
6629 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6630}
6631
fad5fc89
JH		 6632static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6633{
aac23bf6
JH		 6634 int err;
6635
6636 if (!chan->rx_credits) {
6637 BT_ERR("No credits to receive LE L2CAP data");
fad5fc89 6638 return -ENOBUFS;
aac23bf6 6639 }
fad5fc89 6640
aac23bf6
JH		 6641 if (chan->imtu < skb->len) {
6642 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6643 return -ENOBUFS;
aac23bf6 6644 }
fad5fc89
JH		 6645
6646 chan->rx_credits--;
6647 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6648
6649 l2cap_chan_le_send_credits(chan);
6650
aac23bf6
JH		 6651 err = 0;
6652
6653 if (!chan->sdu) {
6654 u16 sdu_len;
6655
6656 sdu_len = get_unaligned_le16(skb->data);
6657 skb_pull(skb, L2CAP_SDULEN_SIZE);
6658
6659 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6660 sdu_len, skb->len, chan->imtu);
6661
6662 if (sdu_len > chan->imtu) {
6663 BT_ERR("Too big LE L2CAP SDU length received");
6664 err = -EMSGSIZE;
6665 goto failed;
6666 }
6667
6668 if (skb->len > sdu_len) {
6669 BT_ERR("Too much LE L2CAP data received");
6670 err = -EINVAL;
6671 goto failed;
6672 }
6673
6674 if (skb->len == sdu_len)
6675 return chan->ops->recv(chan, skb);
6676
6677 chan->sdu = skb;
6678 chan->sdu_len = sdu_len;
6679 chan->sdu_last_frag = skb;
6680
6681 return 0;
6682 }
6683
6684 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6685 chan->sdu->len, skb->len, chan->sdu_len);
6686
6687 if (chan->sdu->len + skb->len > chan->sdu_len) {
6688 BT_ERR("Too much LE L2CAP data received");
6689 err = -EINVAL;
6690 goto failed;
6691 }
6692
6693 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6694 skb = NULL;
6695
6696 if (chan->sdu->len == chan->sdu_len) {
6697 err = chan->ops->recv(chan, chan->sdu);
6698 if (!err) {
6699 chan->sdu = NULL;
6700 chan->sdu_last_frag = NULL;
6701 chan->sdu_len = 0;
6702 }
6703 }
6704
6705failed:
6706 if (err) {
6707 kfree_skb(skb);
6708 kfree_skb(chan->sdu);
6709 chan->sdu = NULL;
6710 chan->sdu_last_frag = NULL;
6711 chan->sdu_len = 0;
6712 }
6713
6714 /* We can't return an error here since we took care of the skb
6715 * freeing internally. An error return would cause the caller to
6716 * do a double-free of the skb.
6717 */
6718 return 0;
fad5fc89
JH		 6719}
6720
13ca56e0
AE		 6721static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6722 struct sk_buff *skb)
1da177e4 6723{
48454079 6724 struct l2cap_chan *chan;
1da177e4 6725
baa7e1fa 6726 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6727 if (!chan) {
97e8e89d
AE		 6728 if (cid == L2CAP_CID_A2MP) {
6729 chan = a2mp_channel_create(conn, skb);
6730 if (!chan) {
6731 kfree_skb(skb);
13ca56e0 6732 return;
97e8e89d
AE		 6733 }
6734
6735 l2cap_chan_lock(chan);
6736 } else {
6737 BT_DBG("unknown cid 0x%4.4x", cid);
6738 /* Drop packet and return */
6739 kfree_skb(skb);
13ca56e0 6740 return;
97e8e89d 6741 }
1da177e4
LT		 6742 }
6743
49208c9c 6744 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6745
89bc500e 6746 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6747 goto drop;
6748
0c1bc5c6 6749 switch (chan->mode) {
38319713 6750 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6751 if (l2cap_le_data_rcv(chan, skb) < 0)
6752 goto drop;
6753
6754 goto done;
6755
1c2acffb
GP		 6756 case L2CAP_MODE_BASIC:
6757 /* If socket recv buffers overflows we drop data here
6758 * which is *bad* because L2CAP has to be reliable.
6759 * But we don't have any other choice. L2CAP doesn't
6760 * provide flow control mechanism. */
1da177e4 6761
0c1bc5c6 6762 if (chan->imtu < skb->len)
1c2acffb 6763 goto drop;
1da177e4 6764
80b98027 6765 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 6766 goto done;
6767 break;
6768
6769 case L2CAP_MODE_ERTM:
6840ed07 6770 case L2CAP_MODE_STREAMING:
cec8ab6e 6771 l2cap_data_rcv(chan, skb);
6840ed07
GP		 6772 goto done;
6773
1c2acffb 6774 default:
0c1bc5c6 6775 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 6776 break;
6777 }
1da177e4
LT		 6778
6779drop:
6780 kfree_skb(skb);
6781
6782done:
6be36555 6783 l2cap_chan_unlock(chan);
1da177e4
LT		 6784}
6785
84104b24
AE		 6786static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6787 struct sk_buff *skb)
1da177e4 6788{
ae4fd2d3 6789 struct hci_conn *hcon = conn->hcon;
23691d75 6790 struct l2cap_chan *chan;
1da177e4 6791
ae4fd2d3
MH		 6792 if (hcon->type != ACL_LINK)
6793 goto drop;
6794
bf20fd4e
JH		 6795 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6796 ACL_LINK);
23691d75 6797 if (!chan)
1da177e4
LT		 6798 goto drop;
6799
5b4cedaa 6800 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6801
89bc500e 6802 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 6803 goto drop;
6804
e13e21dc 6805 if (chan->imtu < skb->len)
1da177e4
LT		 6806 goto drop;
6807
2edf870d 6808 /* Store remote BD_ADDR and PSM for msg_name */
06ae3314 6809 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
2edf870d
MH		 6810 bt_cb(skb)->psm = psm;
6811
80b98027 6812 if (!chan->ops->recv(chan, skb))
84104b24 6813 return;
1da177e4
LT		 6814
6815drop:
6816 kfree_skb(skb);
1da177e4
LT		 6817}
6818
72f78356 6819static void l2cap_att_channel(struct l2cap_conn *conn,
6810fca7 6820 struct sk_buff *skb)
9f69bda6 6821{
b99707d7 6822 struct hci_conn *hcon = conn->hcon;
23691d75 6823 struct l2cap_chan *chan;
9f69bda6 6824
b99707d7
MH		 6825 if (hcon->type != LE_LINK)
6826 goto drop;
6827
af1c0134 6828 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
06ae3314 6829 &hcon->src, &hcon->dst);
23691d75 6830 if (!chan)
9f69bda6
GP		 6831 goto drop;
6832
5b4cedaa 6833 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 6834
cc8dba2b
MH		 6835 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type))
6836 goto drop;
6837
e13e21dc 6838 if (chan->imtu < skb->len)
9f69bda6
GP		 6839 goto drop;
6840
80b98027 6841 if (!chan->ops->recv(chan, skb))
6810fca7 6842 return;
9f69bda6
GP		 6843
6844drop:
6845 kfree_skb(skb);
9f69bda6
GP		 6846}
6847
1da177e4
LT		 6848static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6849{
6850 struct l2cap_hdr *lh = (void *) skb->data;
61a939c6 6851 struct hci_conn *hcon = conn->hcon;
8e036fc3
AV		 6852 u16 cid, len;
6853 __le16 psm;
1da177e4 6854
61a939c6
JH		 6855 if (hcon->state != BT_CONNECTED) {
6856 BT_DBG("queueing pending rx skb");
6857 skb_queue_tail(&conn->pending_rx, skb);
6858 return;
6859 }
6860
1da177e4
LT		 6861 skb_pull(skb, L2CAP_HDR_SIZE);
6862 cid = __le16_to_cpu(lh->cid);
6863 len = __le16_to_cpu(lh->len);
6864
1c2acffb
GP		 6865 if (len != skb->len) {
6866 kfree_skb(skb);
6867 return;
6868 }
6869
1da177e4
LT		 6870 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6871
6872 switch (cid) {
8db4dc46 6873 case L2CAP_CID_SIGNALING:
1da177e4
LT		 6874 l2cap_sig_channel(conn, skb);
6875 break;
6876
8db4dc46 6877 case L2CAP_CID_CONN_LESS:
097db76c 6878 psm = get_unaligned((__le16 *) skb->data);
0181a70f 6879 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 6880 l2cap_conless_channel(conn, psm, skb);
6881 break;
6882
073d1cf3 6883 case L2CAP_CID_ATT:
72f78356 6884 l2cap_att_channel(conn, skb);
9f69bda6
GP		 6885 break;
6886
a2877629
MH		 6887 case L2CAP_CID_LE_SIGNALING:
6888 l2cap_le_sig_channel(conn, skb);
6889 break;
6890
b501d6a1
AB		 6891 case L2CAP_CID_SMP:
6892 if (smp_sig_channel(conn, skb))
6893 l2cap_conn_del(conn->hcon, EACCES);
6894 break;
6895
18722c24
JR		 6896 case L2CAP_FC_6LOWPAN:
6897 bt_6lowpan_recv(conn, skb);
6898 break;
6899
1da177e4
LT		 6900 default:
6901 l2cap_data_channel(conn, cid, skb);
6902 break;
6903 }
6904}
6905
61a939c6
JH		 6906static void process_pending_rx(struct work_struct *work)
6907{
6908 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6909 pending_rx_work);
6910 struct sk_buff *skb;
6911
6912 BT_DBG("");
6913
6914 while ((skb = skb_dequeue(&conn->pending_rx)))
6915 l2cap_recv_frame(conn, skb);
6916}
6917
162b49e7
JH		 6918static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6919{
6920 struct l2cap_conn *conn = hcon->l2cap_data;
6921 struct hci_chan *hchan;
6922
6923 if (conn)
6924 return conn;
6925
6926 hchan = hci_chan_create(hcon);
6927 if (!hchan)
6928 return NULL;
6929
6930 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
6931 if (!conn) {
6932 hci_chan_del(hchan);
6933 return NULL;
6934 }
6935
6936 kref_init(&conn->ref);
6937 hcon->l2cap_data = conn;
6938 conn->hcon = hcon;
6939 hci_conn_get(conn->hcon);
6940 conn->hchan = hchan;
6941
6942 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6943
6944 switch (hcon->type) {
6945 case LE_LINK:
6946 if (hcon->hdev->le_mtu) {
6947 conn->mtu = hcon->hdev->le_mtu;
6948 break;
6949 }
6950 /* fall through */
6951 default:
6952 conn->mtu = hcon->hdev->acl_mtu;
6953 break;
6954 }
6955
6956 conn->feat_mask = 0;
6957
6958 if (hcon->type == ACL_LINK)
6959 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
6960 &hcon->hdev->dev_flags);
6961
6962 spin_lock_init(&conn->lock);
6963 mutex_init(&conn->chan_lock);
6964
6965 INIT_LIST_HEAD(&conn->chan_l);
6966 INIT_LIST_HEAD(&conn->users);
6967
6968 if (hcon->type == LE_LINK)
6969 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
6970 else
6971 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
6972
61a939c6
JH		 6973 skb_queue_head_init(&conn->pending_rx);
6974 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
6975
162b49e7
JH		 6976 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
6977
6978 return conn;
6979}
6980
6981static bool is_valid_psm(u16 psm, u8 dst_type) {
6982 if (!psm)
6983 return false;
6984
6985 if (bdaddr_type_is_le(dst_type))
6986 return (psm <= 0x00ff);
6987
6988 /* PSM must be odd and lsb of upper byte must be 0 */
6989 return ((psm & 0x0101) == 0x0001);
6990}
6991
6992int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
6993 bdaddr_t *dst, u8 dst_type)
6994{
6995 struct l2cap_conn *conn;
6996 struct hci_conn *hcon;
6997 struct hci_dev *hdev;
6998 __u8 auth_type;
6999 int err;
7000
7001 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
7002 dst_type, __le16_to_cpu(psm));
7003
7004 hdev = hci_get_route(dst, &chan->src);
7005 if (!hdev)
7006 return -EHOSTUNREACH;
7007
7008 hci_dev_lock(hdev);
7009
7010 l2cap_chan_lock(chan);
7011
7012 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
7013 chan->chan_type != L2CAP_CHAN_RAW) {
7014 err = -EINVAL;
7015 goto done;
7016 }
7017
21626e62
JH		 7018 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
7019 err = -EINVAL;
7020 goto done;
7021 }
7022
7023 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
162b49e7
JH		 7024 err = -EINVAL;
7025 goto done;
7026 }
7027
7028 switch (chan->mode) {
7029 case L2CAP_MODE_BASIC:
7030 break;
7031 case L2CAP_MODE_LE_FLOWCTL:
7032 l2cap_le_flowctl_init(chan);
7033 break;
7034 case L2CAP_MODE_ERTM:
7035 case L2CAP_MODE_STREAMING:
7036 if (!disable_ertm)
7037 break;
7038 /* fall through */
7039 default:
7040 err = -ENOTSUPP;
7041 goto done;
7042 }
7043
7044 switch (chan->state) {
7045 case BT_CONNECT:
7046 case BT_CONNECT2:
7047 case BT_CONFIG:
7048 /* Already connecting */
7049 err = 0;
7050 goto done;
7051
7052 case BT_CONNECTED:
7053 /* Already connected */
7054 err = -EISCONN;
7055 goto done;
7056
7057 case BT_OPEN:
7058 case BT_BOUND:
7059 /* Can connect */
7060 break;
7061
7062 default:
7063 err = -EBADFD;
7064 goto done;
7065 }
7066
7067 /* Set destination address and psm */
7068 bacpy(&chan->dst, dst);
7069 chan->dst_type = dst_type;
7070
7071 chan->psm = psm;
7072 chan->dcid = cid;
7073
7074 auth_type = l2cap_get_auth_type(chan);
7075
7076 if (bdaddr_type_is_le(dst_type))
7077 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
7078 chan->sec_level, auth_type);
7079 else
7080 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
7081 chan->sec_level, auth_type);
7082
7083 if (IS_ERR(hcon)) {
7084 err = PTR_ERR(hcon);
7085 goto done;
7086 }
7087
7088 conn = l2cap_conn_add(hcon);
7089 if (!conn) {
7090 hci_conn_drop(hcon);
7091 err = -ENOMEM;
7092 goto done;
7093 }
7094
7095 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7096 hci_conn_drop(hcon);
7097 err = -EBUSY;
7098 goto done;
7099 }
7100
7101 /* Update source addr of the socket */
7102 bacpy(&chan->src, &hcon->src);
7103 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7104
7105 l2cap_chan_unlock(chan);
7106 l2cap_chan_add(conn, chan);
7107 l2cap_chan_lock(chan);
7108
7109 /* l2cap_chan_add takes its own ref so we can drop this one */
7110 hci_conn_drop(hcon);
7111
7112 l2cap_state_change(chan, BT_CONNECT);
7113 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7114
7115 if (hcon->state == BT_CONNECTED) {
7116 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7117 __clear_chan_timer(chan);
7118 if (l2cap_chan_check_security(chan))
7119 l2cap_state_change(chan, BT_CONNECTED);
7120 } else
7121 l2cap_do_start(chan);
7122 }
7123
7124 err = 0;
7125
7126done:
7127 l2cap_chan_unlock(chan);
7128 hci_dev_unlock(hdev);
7129 hci_dev_put(hdev);
7130 return err;
7131}
7132
1da177e4
LT		 7133/* ---- L2CAP interface with lower layer (HCI) ---- */
7134
686ebf28 7135int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7136{
7137 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7138 struct l2cap_chan *c;
1da177e4 7139
6ed93dc6 7140 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7141
7142 /* Find listening sockets and check their link_mode */
23691d75
GP		 7143 read_lock(&chan_list_lock);
7144 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7145 if (c->state != BT_LISTEN)
1da177e4
LT		 7146 continue;
7147
7eafc59e 7148 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7149 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7150 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7151 lm1 |= HCI_LM_MASTER;
1da177e4 7152 exact++;
7eafc59e 7153 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7154 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7155 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7156 lm2 |= HCI_LM_MASTER;
7157 }
1da177e4 7158 }
23691d75 7159 read_unlock(&chan_list_lock);
1da177e4
LT		 7160
7161 return exact ? lm1 : lm2;
7162}
7163
9e664631 7164void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7165{
0139418c
MH		 7166 struct l2cap_conn *conn;
7167
6ed93dc6 7168 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7169
1da177e4 7170 if (!status) {
baf43251 7171 conn = l2cap_conn_add(hcon);
1da177e4
LT		 7172 if (conn)
7173 l2cap_conn_ready(conn);
ba6fc317 7174 } else {
e175072f 7175 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 7176 }
1da177e4
LT		 7177}
7178
686ebf28 7179int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7180{
7181 struct l2cap_conn *conn = hcon->l2cap_data;
7182
7183 BT_DBG("hcon %p", hcon);
7184
686ebf28 7185 if (!conn)
9f5a0d7b 7186 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7187 return conn->disc_reason;
7188}
7189
9e664631 7190void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 7191{
7192 BT_DBG("hcon %p reason %d", hcon, reason);
7193
18722c24
JR		 7194 bt_6lowpan_del_conn(hcon->l2cap_data);
7195
e175072f 7196 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7197}
7198
4343478f 7199static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7200{
715ec005 7201 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7202 return;
7203
f62e4323 7204 if (encrypt == 0x00) {
4343478f 7205 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7206 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7d513e92
MH		 7207 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7208 chan->sec_level == BT_SECURITY_FIPS)
0f852724 7209 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7210 } else {
4343478f 7211 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7212 __clear_chan_timer(chan);
f62e4323
MH		 7213 }
7214}
7215
686ebf28 7216int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7217{
0139418c 7218 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7219 struct l2cap_chan *chan;
1da177e4 7220
0139418c 7221 if (!conn)
1da177e4 7222 return 0;
0139418c 7223
89d8b407 7224 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7225
160dc6ac 7226 if (hcon->type == LE_LINK) {
35d4adcc
HG		 7227 if (!status && encrypt)
7228 smp_distribute_keys(conn, 0);
17cd3f37 7229 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 7230 }
7231
3df91ea2 7232 mutex_lock(&conn->chan_lock);
1da177e4 7233
3df91ea2 7234 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7235 l2cap_chan_lock(chan);
1da177e4 7236
89d8b407
AE		 7237 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7238 state_to_string(chan->state));
f1cb9af5 7239
2338a7e0 7240 if (chan->scid == L2CAP_CID_A2MP) {
78eb2f98
AE		 7241 l2cap_chan_unlock(chan);
7242 continue;
7243 }
7244
073d1cf3 7245 if (chan->scid == L2CAP_CID_ATT) {
f1cb9af5
VCG		 7246 if (!status && encrypt) {
7247 chan->sec_level = hcon->sec_level;
cf4cd009 7248 l2cap_chan_ready(chan);
f1cb9af5
VCG		 7249 }
7250
6be36555 7251 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 7252 continue;
7253 }
7254
96eff46e 7255 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7256 l2cap_chan_unlock(chan);
6a8d3010
MH		 7257 continue;
7258 }
7259
89bc500e 7260 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7261 chan->state == BT_CONFIG)) {
d97c899b 7262 chan->ops->resume(chan);
4343478f 7263 l2cap_check_encryption(chan, encrypt);
6be36555 7264 l2cap_chan_unlock(chan);
9719f8af
MH		 7265 continue;
7266 }
7267
89bc500e 7268 if (chan->state == BT_CONNECT) {
6d3c15da 7269 if (!status)
93c3e8f5 7270 l2cap_start_connection(chan);
6d3c15da 7271 else
ba13ccd9 7272 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
89bc500e 7273 } else if (chan->state == BT_CONNECT2) {
b1235d79 7274 struct l2cap_conn_rsp rsp;
df3c3931 7275 __u16 res, stat;
1da177e4 7276
b1235d79 7277 if (!status) {
bdc25783 7278 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7279 res = L2CAP_CR_PEND;
7280 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7281 chan->ops->defer(chan);
df3c3931 7282 } else {
acdcabf5 7283 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7284 res = L2CAP_CR_SUCCESS;
7285 stat = L2CAP_CS_NO_INFO;
7286 }
b1235d79 7287 } else {
acdcabf5 7288 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7289 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7290 res = L2CAP_CR_SEC_BLOCK;
7291 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7292 }
7293
fe4128e0
GP		 7294 rsp.scid = cpu_to_le16(chan->dcid);
7295 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7296 rsp.result = cpu_to_le16(res);
7297 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7298 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7299 sizeof(rsp), &rsp);
2d369359
MM		 7300
7301 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7302 res == L2CAP_CR_SUCCESS) {
7303 char buf[128];
7304 set_bit(CONF_REQ_SENT, &chan->conf_state);
7305 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7306 L2CAP_CONF_REQ,
7307 l2cap_build_conf_req(chan, buf),
7308 buf);
7309 chan->num_conf_req++;
7310 }
b1235d79 7311 }
1da177e4 7312
6be36555 7313 l2cap_chan_unlock(chan);
1da177e4
LT		 7314 }
7315
3df91ea2 7316 mutex_unlock(&conn->chan_lock);
b1235d79 7317
1da177e4
LT		 7318 return 0;
7319}
7320
686ebf28 7321int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7322{
7323 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7324 struct l2cap_hdr *hdr;
7325 int len;
1da177e4 7326
1d13a254
AE		 7327 /* For AMP controller do not create l2cap conn */
7328 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7329 goto drop;
1da177e4 7330
5a08ecce 7331 if (!conn)
baf43251 7332 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7333
7334 if (!conn)
1da177e4
LT		 7335 goto drop;
7336
7337 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7338
d73a0988
AE		 7339 switch (flags) {
7340 case ACL_START:
7341 case ACL_START_NO_FLUSH:
7342 case ACL_COMPLETE:
1da177e4
LT		 7343 if (conn->rx_len) {
7344 BT_ERR("Unexpected start frame (len %d)", skb->len);
7345 kfree_skb(conn->rx_skb);
7346 conn->rx_skb = NULL;
7347 conn->rx_len = 0;
7348 l2cap_conn_unreliable(conn, ECOMM);
7349 }
7350
aae7fe22
AE		 7351 /* Start fragment always begin with Basic L2CAP header */
7352 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7353 BT_ERR("Frame is too short (len %d)", skb->len);
7354 l2cap_conn_unreliable(conn, ECOMM);
7355 goto drop;
7356 }
7357
7358 hdr = (struct l2cap_hdr *) skb->data;
7359 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7360
7361 if (len == skb->len) {
7362 /* Complete frame received */
7363 l2cap_recv_frame(conn, skb);
7364 return 0;
7365 }
7366
7367 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7368
7369 if (skb->len > len) {
7370 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7371 skb->len, len);
1da177e4
LT		 7372 l2cap_conn_unreliable(conn, ECOMM);
7373 goto drop;
7374 }
7375
7376 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7377 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7378 if (!conn->rx_skb)
1da177e4
LT		 7379 goto drop;
7380
d626f62b 7381 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7382 skb->len);
1da177e4 7383 conn->rx_len = len - skb->len;
d73a0988
AE		 7384 break;
7385
7386 case ACL_CONT:
1da177e4
LT		 7387 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7388
7389 if (!conn->rx_len) {
7390 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7391 l2cap_conn_unreliable(conn, ECOMM);
7392 goto drop;
7393 }
7394
7395 if (skb->len > conn->rx_len) {
7396 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7397 skb->len, conn->rx_len);
1da177e4
LT		 7398 kfree_skb(conn->rx_skb);
7399 conn->rx_skb = NULL;
7400 conn->rx_len = 0;
7401 l2cap_conn_unreliable(conn, ECOMM);
7402 goto drop;
7403 }
7404
d626f62b 7405 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7406 skb->len);
1da177e4
LT		 7407 conn->rx_len -= skb->len;
7408
7409 if (!conn->rx_len) {
c4e5bafa
JH		 7410 /* Complete frame received. l2cap_recv_frame
7411 * takes ownership of the skb so set the global
7412 * rx_skb pointer to NULL first.
7413 */
7414 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7415 conn->rx_skb = NULL;
c4e5bafa 7416 l2cap_recv_frame(conn, rx_skb);
1da177e4 7417 }
d73a0988 7418 break;
1da177e4
LT		 7419 }
7420
7421drop:
7422 kfree_skb(skb);
7423 return 0;
7424}
7425
aef7d97c 7426static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7427{
23691d75 7428 struct l2cap_chan *c;
1da177e4 7429
333055f2 7430 read_lock(&chan_list_lock);
1da177e4 7431
23691d75 7432 list_for_each_entry(c, &chan_list, global_l) {
fcb73338 7433 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7eafc59e 7434 &c->src, &c->dst,
fcb73338
AE		 7435 c->state, __le16_to_cpu(c->psm),
7436 c->scid, c->dcid, c->imtu, c->omtu,
7437 c->sec_level, c->mode);
61e1b4b7 7438 }
1da177e4 7439
333055f2 7440 read_unlock(&chan_list_lock);
1da177e4 7441
aef7d97c 7442 return 0;
1da177e4
LT		 7443}
7444
aef7d97c
MH		 7445static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7446{
7447 return single_open(file, l2cap_debugfs_show, inode->i_private);
7448}
7449
7450static const struct file_operations l2cap_debugfs_fops = {
7451 .open = l2cap_debugfs_open,
7452 .read = seq_read,
7453 .llseek = seq_lseek,
7454 .release = single_release,
7455};
7456
7457static struct dentry *l2cap_debugfs;
1da177e4 7458
64274518 7459int __init l2cap_init(void)
1da177e4
LT		 7460{
7461 int err;
be9d1227 7462
bb58f747 7463 err = l2cap_init_sockets();
1da177e4
LT		 7464 if (err < 0)
7465 return err;
7466
1120e4bf
MH		 7467 if (IS_ERR_OR_NULL(bt_debugfs))
7468 return 0;
7469
7470 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7471 NULL, &l2cap_debugfs_fops);
1da177e4 7472
f15b8ecf
JH		 7473 debugfs_create_u16("l2cap_le_max_credits", 0466, bt_debugfs,
7474 &le_max_credits);
7475 debugfs_create_u16("l2cap_le_default_mps", 0466, bt_debugfs,
7476 &le_default_mps);
7477
18722c24
JR		 7478 bt_6lowpan_init();
7479
1da177e4 7480 return 0;
1da177e4
LT		 7481}
7482
64274518 7483void l2cap_exit(void)
1da177e4 7484{
18722c24 7485 bt_6lowpan_cleanup();
aef7d97c 7486 debugfs_remove(l2cap_debugfs);
bb58f747 7487 l2cap_cleanup_sockets();
1da177e4
LT		 7488}
7489
d1c4a17d
GP		 7490module_param(disable_ertm, bool, 0644);
7491MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux 6.x block layer and io_uring tree(s)