]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - net/bluetooth/l2cap_core.c
projects / mirror_ubuntu-zesty-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge remote-tracking branch 'asoc/topic/cs42xx8' into asoc-next
[mirror_ubuntu-zesty-kernel.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
333static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
334{
335 u16 mask = seq_list->mask;
336
337 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
338 /* In case someone tries to pop the head of an empty list */
339 return L2CAP_SEQ_LIST_CLEAR;
340 } else if (seq_list->head == seq) {
341 /* Head can be removed in constant time */
342 seq_list->head = seq_list->list[seq & mask];
343 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
344
345 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
346 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
347 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
348 }
349 } else {
350 /* Walk the list to find the sequence number */
351 u16 prev = seq_list->head;
352 while (seq_list->list[prev & mask] != seq) {
353 prev = seq_list->list[prev & mask];
354 if (prev == L2CAP_SEQ_LIST_TAIL)
355 return L2CAP_SEQ_LIST_CLEAR;
356 }
357
358 /* Unlink the number from the list and clear it */
359 seq_list->list[prev & mask] = seq_list->list[seq & mask];
360 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
361 if (seq_list->tail == seq)
362 seq_list->tail = prev;
363 }
364 return seq;
365}
366
367static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
368{
369 /* Remove the head in constant time */
370 return l2cap_seq_list_remove(seq_list, seq_list->head);
371}
372
373static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
374{
f522ae36 375 u16 i;
3c588192 376
f522ae36
GP		 377 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
378 return;
379
380 for (i = 0; i <= seq_list->mask; i++)
381 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
382
383 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
384 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
3c588192
MM		 385}
386
387static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
388{
389 u16 mask = seq_list->mask;
390
391 /* All appends happen in constant time */
392
f522ae36
GP		 393 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
394 return;
3c588192 395
f522ae36
GP		 396 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
397 seq_list->head = seq;
398 else
399 seq_list->list[seq_list->tail & mask] = seq;
400
401 seq_list->tail = seq;
402 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
3c588192
MM		 403}
404
721c4181 405static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 406{
721c4181 407 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
2d792818 408 chan_timer.work);
3df91ea2 409 struct l2cap_conn *conn = chan->conn;
ab07801d
GP		 410 int reason;
411
e05dcc32 412 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
ab07801d 413
3df91ea2 414 mutex_lock(&conn->chan_lock);
6be36555 415 l2cap_chan_lock(chan);
ab07801d 416
89bc500e 417 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 418 reason = ECONNREFUSED;
89bc500e 419 else if (chan->state == BT_CONNECT &&
2d792818 420 chan->sec_level != BT_SECURITY_SDP)
ab07801d
GP		 421 reason = ECONNREFUSED;
422 else
423 reason = ETIMEDOUT;
424
0f852724 425 l2cap_chan_close(chan, reason);
ab07801d 426
6be36555 427 l2cap_chan_unlock(chan);
ab07801d 428
80b98027 429 chan->ops->close(chan);
3df91ea2
AE		 430 mutex_unlock(&conn->chan_lock);
431
371fd835 432 l2cap_chan_put(chan);
ab07801d
GP		 433}
434
eef1d9b6 435struct l2cap_chan *l2cap_chan_create(void)
48454079
GP		 436{
437 struct l2cap_chan *chan;
438
439 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
440 if (!chan)
441 return NULL;
442
c03b355e
AE		 443 mutex_init(&chan->lock);
444
333055f2 445 write_lock(&chan_list_lock);
23691d75 446 list_add(&chan->global_l, &chan_list);
333055f2 447 write_unlock(&chan_list_lock);
23691d75 448
721c4181 449 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 450
89bc500e
GP		 451 chan->state = BT_OPEN;
452
144ad330 453 kref_init(&chan->kref);
71ba0e56 454
2827011f
MM		 455 /* This flag is cleared in l2cap_chan_ready() */
456 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
457
eef1d9b6 458 BT_DBG("chan %p", chan);
abc545b8 459
48454079
GP		 460 return chan;
461}
462
144ad330 463static void l2cap_chan_destroy(struct kref *kref)
6ff5abbf 464{
144ad330
SS		 465 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
466
4af66c69
JK		 467 BT_DBG("chan %p", chan);
468
333055f2 469 write_lock(&chan_list_lock);
23691d75 470 list_del(&chan->global_l);
333055f2 471 write_unlock(&chan_list_lock);
23691d75 472
4af66c69 473 kfree(chan);
6ff5abbf
GP		 474}
475
30648372
JK		 476void l2cap_chan_hold(struct l2cap_chan *c)
477{
144ad330 478 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 479
144ad330 480 kref_get(&c->kref);
30648372
JK		 481}
482
483void l2cap_chan_put(struct l2cap_chan *c)
484{
144ad330 485 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
30648372 486
144ad330 487 kref_put(&c->kref, l2cap_chan_destroy);
30648372
JK		 488}
489
bd4b1653
AE		 490void l2cap_chan_set_defaults(struct l2cap_chan *chan)
491{
492 chan->fcs = L2CAP_FCS_CRC16;
493 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
494 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
495 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
c20f8e35 496 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
bd4b1653
AE		 497 chan->sec_level = BT_SECURITY_LOW;
498
499 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
500}
501
0ce43ce6 502static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
38319713 503{
0ce43ce6
JH		 504 chan->sdu = NULL;
505 chan->sdu_last_frag = NULL;
506 chan->sdu_len = 0;
0cd75f7e 507 chan->tx_credits = 0;
f15b8ecf 508 chan->rx_credits = le_max_credits;
f1324ea5 509 chan->mps = min_t(u16, chan->imtu, L2CAP_LE_DEFAULT_MPS);
0ce43ce6
JH		 510
511 skb_queue_head_init(&chan->tx_q);
38319713
JH		 512}
513
93c3e8f5 514void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 515{
af05b30b 516 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
097db76c 517 __le16_to_cpu(chan->psm), chan->dcid);
0139418c 518
9f5a0d7b 519 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 520
8c1d787b 521 chan->conn = conn;
0139418c 522
5491120e
AE		 523 switch (chan->chan_type) {
524 case L2CAP_CHAN_CONN_ORIENTED:
b62f328b 525 if (conn->hcon->type == LE_LINK) {
aeddd075
JH		 526 if (chan->dcid == L2CAP_CID_ATT) {
527 chan->omtu = L2CAP_DEFAULT_MTU;
9f22398c 528 chan->scid = L2CAP_CID_ATT;
aeddd075 529 } else {
9f22398c 530 chan->scid = l2cap_alloc_cid(conn);
aeddd075 531 }
b62f328b
VT		 532 } else {
533 /* Alloc CID for connection-oriented socket */
fe4128e0 534 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 535 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 536 }
5491120e
AE		 537 break;
538
539 case L2CAP_CHAN_CONN_LESS:
0139418c 540 /* Connectionless socket */
fe4128e0
GP		 541 chan->scid = L2CAP_CID_CONN_LESS;
542 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 543 chan->omtu = L2CAP_DEFAULT_MTU;
5491120e
AE		 544 break;
545
416fa752
AE		 546 case L2CAP_CHAN_CONN_FIX_A2MP:
547 chan->scid = L2CAP_CID_A2MP;
548 chan->dcid = L2CAP_CID_A2MP;
549 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
550 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
551 break;
552
5491120e 553 default:
0139418c 554 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 555 chan->scid = L2CAP_CID_SIGNALING;
556 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 557 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 558 }
559
8f7975b1
AE		 560 chan->local_id = L2CAP_BESTEFFORT_ID;
561 chan->local_stype = L2CAP_SERV_BESTEFFORT;
562 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
563 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
564 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
8936fa6d 565 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
8f7975b1 566
371fd835 567 l2cap_chan_hold(chan);
baa7e1fa 568
5ee9891d
JH		 569 hci_conn_hold(conn->hcon);
570
3df91ea2 571 list_add(&chan->list, &conn->chan_l);
643162a8
AE		 572}
573
466f8004 574void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
643162a8
AE		 575{
576 mutex_lock(&conn->chan_lock);
577 __l2cap_chan_add(conn, chan);
3df91ea2 578 mutex_unlock(&conn->chan_lock);
0139418c
MH		 579}
580
466f8004 581void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 582{
8c1d787b 583 struct l2cap_conn *conn = chan->conn;
0139418c 584
c9b66675 585 __clear_chan_timer(chan);
0139418c 586
49208c9c 587 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 588
8e87d142 589 if (conn) {
56f60984 590 struct amp_mgr *mgr = conn->hcon->amp_mgr;
baa7e1fa 591 /* Delete from channel list */
3df91ea2 592 list_del(&chan->list);
3d57dc68 593
371fd835 594 l2cap_chan_put(chan);
baa7e1fa 595
8c1d787b 596 chan->conn = NULL;
3cabbfda
AE		 597
598 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
76a68ba0 599 hci_conn_drop(conn->hcon);
56f60984
AE		 600
601 if (mgr && mgr->bredr_chan == chan)
602 mgr->bredr_chan = NULL;
0139418c
MH		 603 }
604
419e08c1
AE		 605 if (chan->hs_hchan) {
606 struct hci_chan *hs_hchan = chan->hs_hchan;
607
608 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
609 amp_disconnect_logical_link(hs_hchan);
610 }
611
b699ec0d 612 chan->ops->teardown(chan, err);
6be36555 613
2827011f 614 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
6ff5abbf 615 return;
2ead70b8 616
ee556f66
GP		 617 switch(chan->mode) {
618 case L2CAP_MODE_BASIC:
619 break;
c13ffa62 620
38319713 621 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b 622 skb_queue_purge(&chan->tx_q);
38319713
JH		 623 break;
624
ee556f66 625 case L2CAP_MODE_ERTM:
1a09bcb9
GP		 626 __clear_retrans_timer(chan);
627 __clear_monitor_timer(chan);
628 __clear_ack_timer(chan);
c13ffa62 629
f1c6775b 630 skb_queue_purge(&chan->srej_q);
c13ffa62 631
3c588192
MM		 632 l2cap_seq_list_free(&chan->srej_list);
633 l2cap_seq_list_free(&chan->retrans_list);
ee556f66
GP		 634
635 /* fall through */
636
637 case L2CAP_MODE_STREAMING:
638 skb_queue_purge(&chan->tx_q);
639 break;
c13ffa62 640 }
ee556f66
GP		 641
642 return;
0139418c
MH		 643}
644
27e2d4c8
JH		 645static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
646{
647 struct l2cap_conn *conn = chan->conn;
648 struct l2cap_le_conn_rsp rsp;
649 u16 result;
650
651 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
652 result = L2CAP_CR_AUTHORIZATION;
653 else
654 result = L2CAP_CR_BAD_PSM;
655
656 l2cap_state_change(chan, BT_DISCONN);
657
658 rsp.dcid = cpu_to_le16(chan->scid);
659 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 660 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 661 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 662 rsp.result = cpu_to_le16(result);
663
664 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
665 &rsp);
666}
667
791d60f7
JH		 668static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
669{
670 struct l2cap_conn *conn = chan->conn;
671 struct l2cap_conn_rsp rsp;
672 u16 result;
673
674 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
675 result = L2CAP_CR_SEC_BLOCK;
676 else
677 result = L2CAP_CR_BAD_PSM;
678
679 l2cap_state_change(chan, BT_DISCONN);
680
681 rsp.scid = cpu_to_le16(chan->dcid);
682 rsp.dcid = cpu_to_le16(chan->scid);
683 rsp.result = cpu_to_le16(result);
684 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
685
686 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
687}
688
0f852724 689void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 690{
691 struct l2cap_conn *conn = chan->conn;
4519de9a 692
7eafc59e 693 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
4519de9a 694
89bc500e 695 switch (chan->state) {
4519de9a 696 case BT_LISTEN:
b699ec0d 697 chan->ops->teardown(chan, 0);
4519de9a
GP		 698 break;
699
700 case BT_CONNECTED:
701 case BT_CONFIG:
cea04ce3
JH		 702 /* ATT uses L2CAP_CHAN_CONN_ORIENTED so we must also
703 * check for chan->psm.
704 */
705 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && chan->psm) {
8d836d71 706 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5e4e3972 707 l2cap_send_disconn_req(chan, reason);
4519de9a
GP		 708 } else
709 l2cap_chan_del(chan, reason);
710 break;
711
712 case BT_CONNECT2:
791d60f7
JH		 713 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
714 if (conn->hcon->type == ACL_LINK)
715 l2cap_chan_connect_reject(chan);
27e2d4c8
JH		 716 else if (conn->hcon->type == LE_LINK)
717 l2cap_chan_le_connect_reject(chan);
4519de9a
GP		 718 }
719
720 l2cap_chan_del(chan, reason);
721 break;
722
723 case BT_CONNECT:
724 case BT_DISCONN:
725 l2cap_chan_del(chan, reason);
726 break;
727
728 default:
b699ec0d 729 chan->ops->teardown(chan, 0);
4519de9a
GP		 730 break;
731 }
732}
733
4343478f 734static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 735{
6a974b50
MH		 736 switch (chan->chan_type) {
737 case L2CAP_CHAN_RAW:
4343478f 738 switch (chan->sec_level) {
8556edd3
JH		 739 case BT_SECURITY_HIGH:
740 return HCI_AT_DEDICATED_BONDING_MITM;
741 case BT_SECURITY_MEDIUM:
742 return HCI_AT_DEDICATED_BONDING;
743 default:
744 return HCI_AT_NO_BONDING;
745 }
6a974b50 746 break;
3124b843
MH		 747 case L2CAP_CHAN_CONN_LESS:
748 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) {
749 if (chan->sec_level == BT_SECURITY_LOW)
750 chan->sec_level = BT_SECURITY_SDP;
751 }
752 if (chan->sec_level == BT_SECURITY_HIGH)
753 return HCI_AT_NO_BONDING_MITM;
754 else
755 return HCI_AT_NO_BONDING;
756 break;
6a974b50
MH		 757 case L2CAP_CHAN_CONN_ORIENTED:
758 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
759 if (chan->sec_level == BT_SECURITY_LOW)
760 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 761
6a974b50
MH		 762 if (chan->sec_level == BT_SECURITY_HIGH)
763 return HCI_AT_NO_BONDING_MITM;
764 else
765 return HCI_AT_NO_BONDING;
766 }
767 /* fall through */
768 default:
4343478f 769 switch (chan->sec_level) {
00ae4af9 770 case BT_SECURITY_HIGH:
8556edd3 771 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 772 case BT_SECURITY_MEDIUM:
8556edd3 773 return HCI_AT_GENERAL_BONDING;
00ae4af9 774 default:
8556edd3 775 return HCI_AT_NO_BONDING;
00ae4af9 776 }
6a974b50 777 break;
0684e5f9 778 }
8556edd3
JH		 779}
780
781/* Service level security */
d45fc423 782int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 783{
8c1d787b 784 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 785 __u8 auth_type;
786
a17de2fe
JH		 787 if (conn->hcon->type == LE_LINK)
788 return smp_conn_security(conn->hcon, chan->sec_level);
789
4343478f 790 auth_type = l2cap_get_auth_type(chan);
79d554a6 791
4343478f 792 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 793}
794
b5ad8b7f 795static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 796{
797 u8 id;
798
799 /* Get next available identificator.
800 * 1 - 128 are used by kernel.
801 * 129 - 199 are reserved.
802 * 200 - 254 are used by utilities like l2ping, etc.
803 */
804
333055f2 805 spin_lock(&conn->lock);
4e8402a3
MH		 806
807 if (++conn->tx_ident > 128)
808 conn->tx_ident = 1;
809
810 id = conn->tx_ident;
811
333055f2 812 spin_unlock(&conn->lock);
4e8402a3
MH		 813
814 return id;
815}
816
2d792818
GP		 817static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
818 void *data)
4e8402a3
MH		 819{
820 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 821 u8 flags;
4e8402a3
MH		 822
823 BT_DBG("code 0x%2.2x", code);
824
825 if (!skb)
9a9c6a34 826 return;
4e8402a3 827
e702112f
AE		 828 if (lmp_no_flush_capable(conn->hcon->hdev))
829 flags = ACL_START_NO_FLUSH;
830 else
831 flags = ACL_START;
832
14b12d0b 833 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 834 skb->priority = HCI_PRIO_MAX;
14b12d0b 835
73d80deb
LAD		 836 hci_send_acl(conn->hchan, skb, flags);
837}
838
02b0fbb9
MM		 839static bool __chan_is_moving(struct l2cap_chan *chan)
840{
841 return chan->move_state != L2CAP_MOVE_STABLE &&
842 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
843}
844
73d80deb
LAD		 845static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
846{
847 struct hci_conn *hcon = chan->conn->hcon;
848 u16 flags;
849
850 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
2d792818 851 skb->priority);
73d80deb 852
d5f8a75d
MM		 853 if (chan->hs_hcon && !__chan_is_moving(chan)) {
854 if (chan->hs_hchan)
855 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
856 else
857 kfree_skb(skb);
858
859 return;
860 }
861
73d80deb 862 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
2d792818 863 lmp_no_flush_capable(hcon->hdev))
73d80deb
LAD		 864 flags = ACL_START_NO_FLUSH;
865 else
866 flags = ACL_START;
14b12d0b 867
73d80deb
LAD		 868 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
869 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 870}
871
b76bbd66
MM		 872static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
873{
874 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
875 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
876
877 if (enh & L2CAP_CTRL_FRAME_TYPE) {
878 /* S-Frame */
879 control->sframe = 1;
880 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
881 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
882
883 control->sar = 0;
884 control->txseq = 0;
885 } else {
886 /* I-Frame */
887 control->sframe = 0;
888 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
889 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
890
891 control->poll = 0;
892 control->super = 0;
893 }
894}
895
b76bbd66
MM		 896static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
897{
898 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
899 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
900
901 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
902 /* S-Frame */
903 control->sframe = 1;
904 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
905 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
906
907 control->sar = 0;
908 control->txseq = 0;
909 } else {
910 /* I-Frame */
911 control->sframe = 0;
912 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
913 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
914
915 control->poll = 0;
916 control->super = 0;
917 }
918}
919
920static inline void __unpack_control(struct l2cap_chan *chan,
921 struct sk_buff *skb)
922{
923 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
924 __unpack_extended_control(get_unaligned_le32(skb->data),
925 &bt_cb(skb)->control);
cec8ab6e 926 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
b76bbd66
MM		 927 } else {
928 __unpack_enhanced_control(get_unaligned_le16(skb->data),
929 &bt_cb(skb)->control);
cec8ab6e 930 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
b76bbd66
MM		 931 }
932}
933
b5c6aaed
MM		 934static u32 __pack_extended_control(struct l2cap_ctrl *control)
935{
936 u32 packed;
937
938 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
939 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
940
941 if (control->sframe) {
942 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
943 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
944 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
945 } else {
946 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
947 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
948 }
949
950 return packed;
951}
952
953static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
954{
955 u16 packed;
956
957 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
958 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
959
960 if (control->sframe) {
961 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
962 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
963 packed |= L2CAP_CTRL_FRAME_TYPE;
964 } else {
965 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
966 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
967 }
968
969 return packed;
970}
971
b76bbd66
MM		 972static inline void __pack_control(struct l2cap_chan *chan,
973 struct l2cap_ctrl *control,
974 struct sk_buff *skb)
975{
976 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
977 put_unaligned_le32(__pack_extended_control(control),
978 skb->data + L2CAP_HDR_SIZE);
979 } else {
980 put_unaligned_le16(__pack_enhanced_control(control),
981 skb->data + L2CAP_HDR_SIZE);
982 }
983}
984
ba7aa64f
GP		 985static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
986{
987 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
988 return L2CAP_EXT_HDR_SIZE;
989 else
990 return L2CAP_ENH_HDR_SIZE;
991}
992
a67d7f6f
MM		 993static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
994 u32 control)
b5c6aaed
MM		 995{
996 struct sk_buff *skb;
997 struct l2cap_hdr *lh;
ba7aa64f 998 int hlen = __ertm_hdr_size(chan);
b5c6aaed
MM		 999
1000 if (chan->fcs == L2CAP_FCS_CRC16)
1001 hlen += L2CAP_FCS_SIZE;
1002
a67d7f6f 1003 skb = bt_skb_alloc(hlen, GFP_KERNEL);
b5c6aaed 1004
b5c6aaed 1005 if (!skb)
a67d7f6f 1006 return ERR_PTR(-ENOMEM);
b5c6aaed
MM		 1007
1008 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1009 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1010 lh->cid = cpu_to_le16(chan->dcid);
1011
a67d7f6f
MM		 1012 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1013 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1014 else
1015 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
b5c6aaed
MM		 1016
1017 if (chan->fcs == L2CAP_FCS_CRC16) {
a67d7f6f 1018 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
b5c6aaed
MM		 1019 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1020 }
1021
1022 skb->priority = HCI_PRIO_MAX;
a67d7f6f
MM		 1023 return skb;
1024}
1025
1026static void l2cap_send_sframe(struct l2cap_chan *chan,
1027 struct l2cap_ctrl *control)
1028{
1029 struct sk_buff *skb;
1030 u32 control_field;
1031
1032 BT_DBG("chan %p, control %p", chan, control);
1033
1034 if (!control->sframe)
1035 return;
1036
b99e13ad
MM		 1037 if (__chan_is_moving(chan))
1038 return;
1039
a67d7f6f
MM		 1040 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1041 !control->poll)
1042 control->final = 1;
1043
1044 if (control->super == L2CAP_SUPER_RR)
1045 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1046 else if (control->super == L2CAP_SUPER_RNR)
1047 set_bit(CONN_RNR_SENT, &chan->conn_state);
1048
1049 if (control->super != L2CAP_SUPER_SREJ) {
1050 chan->last_acked_seq = control->reqseq;
1051 __clear_ack_timer(chan);
1052 }
1053
1054 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1055 control->final, control->poll, control->super);
1056
1057 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1058 control_field = __pack_extended_control(control);
1059 else
1060 control_field = __pack_enhanced_control(control);
1061
1062 skb = l2cap_create_sframe_pdu(chan, control_field);
1063 if (!IS_ERR(skb))
1064 l2cap_do_send(chan, skb);
b5c6aaed
MM		 1065}
1066
c9e3d5e0 1067static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
b5c6aaed 1068{
c9e3d5e0
MM		 1069 struct l2cap_ctrl control;
1070
1071 BT_DBG("chan %p, poll %d", chan, poll);
1072
1073 memset(&control, 0, sizeof(control));
1074 control.sframe = 1;
1075 control.poll = poll;
1076
1077 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1078 control.super = L2CAP_SUPER_RNR;
1079 else
1080 control.super = L2CAP_SUPER_RR;
b5c6aaed 1081
c9e3d5e0
MM		 1082 control.reqseq = chan->buffer_seq;
1083 l2cap_send_sframe(chan, &control);
b5c6aaed
MM		 1084}
1085
b4450035 1086static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 1087{
c1360a1c 1088 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 1089}
1090
1df7b17a 1091static bool __amp_capable(struct l2cap_chan *chan)
80d58d0b 1092{
1df7b17a 1093 struct l2cap_conn *conn = chan->conn;
80d58d0b 1094 struct hci_dev *hdev;
1df7b17a
MH		 1095 bool amp_available = false;
1096
1097 if (!conn->hs_enabled)
1098 return false;
1099
1100 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1101 return false;
80d58d0b
MH		 1102
1103 read_lock(&hci_dev_list_lock);
1df7b17a 1104 list_for_each_entry(hdev, &hci_dev_list, list) {
80d58d0b 1105 if (hdev->amp_type != AMP_TYPE_BREDR &&
1df7b17a
MH		 1106 test_bit(HCI_UP, &hdev->flags)) {
1107 amp_available = true;
1108 break;
1109 }
1110 }
80d58d0b
MH		 1111 read_unlock(&hci_dev_list_lock);
1112
1df7b17a
MH		 1113 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1114 return amp_available;
848566b3
MH		 1115
1116 return false;
93c3e8f5
AE		 1117}
1118
5ce66b59
AE		 1119static bool l2cap_check_efs(struct l2cap_chan *chan)
1120{
1121 /* Check EFS parameters */
1122 return true;
1123}
1124
2766be48 1125void l2cap_send_conn_req(struct l2cap_chan *chan)
9b27f350
AE		 1126{
1127 struct l2cap_conn *conn = chan->conn;
1128 struct l2cap_conn_req req;
1129
1130 req.scid = cpu_to_le16(chan->scid);
1131 req.psm = chan->psm;
1132
1133 chan->ident = l2cap_get_ident(conn);
1134
1135 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1136
1137 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1138}
1139
8eb200bd
MM		 1140static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1141{
1142 struct l2cap_create_chan_req req;
1143 req.scid = cpu_to_le16(chan->scid);
1144 req.psm = chan->psm;
1145 req.amp_id = amp_id;
1146
1147 chan->ident = l2cap_get_ident(chan->conn);
1148
1149 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1150 sizeof(req), &req);
1151}
1152
02b0fbb9
MM		 1153static void l2cap_move_setup(struct l2cap_chan *chan)
1154{
1155 struct sk_buff *skb;
1156
1157 BT_DBG("chan %p", chan);
1158
1159 if (chan->mode != L2CAP_MODE_ERTM)
1160 return;
1161
1162 __clear_retrans_timer(chan);
1163 __clear_monitor_timer(chan);
1164 __clear_ack_timer(chan);
1165
1166 chan->retry_count = 0;
1167 skb_queue_walk(&chan->tx_q, skb) {
1168 if (bt_cb(skb)->control.retries)
1169 bt_cb(skb)->control.retries = 1;
1170 else
1171 break;
1172 }
1173
1174 chan->expected_tx_seq = chan->buffer_seq;
1175
1176 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1177 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1178 l2cap_seq_list_clear(&chan->retrans_list);
1179 l2cap_seq_list_clear(&chan->srej_list);
1180 skb_queue_purge(&chan->srej_q);
1181
1182 chan->tx_state = L2CAP_TX_STATE_XMIT;
1183 chan->rx_state = L2CAP_RX_STATE_MOVE;
1184
1185 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1186}
1187
5f3847a4
MM		 1188static void l2cap_move_done(struct l2cap_chan *chan)
1189{
1190 u8 move_role = chan->move_role;
1191 BT_DBG("chan %p", chan);
1192
1193 chan->move_state = L2CAP_MOVE_STABLE;
1194 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1195
1196 if (chan->mode != L2CAP_MODE_ERTM)
1197 return;
1198
1199 switch (move_role) {
1200 case L2CAP_MOVE_ROLE_INITIATOR:
1201 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1202 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1203 break;
1204 case L2CAP_MOVE_ROLE_RESPONDER:
1205 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1206 break;
1207 }
1208}
1209
9f0caeb1
VCG		 1210static void l2cap_chan_ready(struct l2cap_chan *chan)
1211{
2827011f 1212 /* This clears all conf flags, including CONF_NOT_COMPLETE */
9f0caeb1
VCG		 1213 chan->conf_state = 0;
1214 __clear_chan_timer(chan);
1215
0ce43ce6
JH		 1216 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1217 chan->ops->suspend(chan);
177f8f2b 1218
54a59aa2 1219 chan->state = BT_CONNECTED;
9f0caeb1 1220
fd83e2c2 1221 chan->ops->ready(chan);
9f0caeb1
VCG		 1222}
1223
f1496dee
JH		 1224static void l2cap_le_connect(struct l2cap_chan *chan)
1225{
1226 struct l2cap_conn *conn = chan->conn;
1227 struct l2cap_le_conn_req req;
1228
595177f3
JH		 1229 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1230 return;
1231
f1496dee
JH		 1232 req.psm = chan->psm;
1233 req.scid = cpu_to_le16(chan->scid);
1234 req.mtu = cpu_to_le16(chan->imtu);
3916aed8 1235 req.mps = cpu_to_le16(chan->mps);
0cd75f7e 1236 req.credits = cpu_to_le16(chan->rx_credits);
f1496dee
JH		 1237
1238 chan->ident = l2cap_get_ident(conn);
1239
1240 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1241 sizeof(req), &req);
1242}
1243
1244static void l2cap_le_start(struct l2cap_chan *chan)
1245{
1246 struct l2cap_conn *conn = chan->conn;
1247
1248 if (!smp_conn_security(conn->hcon, chan->sec_level))
1249 return;
1250
1251 if (!chan->psm) {
1252 l2cap_chan_ready(chan);
1253 return;
1254 }
1255
1256 if (chan->state == BT_CONNECT)
1257 l2cap_le_connect(chan);
1258}
1259
93c3e8f5
AE		 1260static void l2cap_start_connection(struct l2cap_chan *chan)
1261{
1262 if (__amp_capable(chan)) {
1263 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1264 a2mp_discover_amp(chan);
f1496dee
JH		 1265 } else if (chan->conn->hcon->type == LE_LINK) {
1266 l2cap_le_start(chan);
93c3e8f5
AE		 1267 } else {
1268 l2cap_send_conn_req(chan);
1269 }
1270}
1271
fc7f8a7e 1272static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 1273{
8c1d787b 1274 struct l2cap_conn *conn = chan->conn;
79d554a6 1275
9f0caeb1 1276 if (conn->hcon->type == LE_LINK) {
96ac34fb 1277 l2cap_le_start(chan);
9f0caeb1
VCG		 1278 return;
1279 }
1280
79d554a6 1281 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 1282 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1283 return;
1284
d45fc423 1285 if (l2cap_chan_check_security(chan) &&
2d792818 1286 __l2cap_no_conn_pending(chan)) {
93c3e8f5
AE		 1287 l2cap_start_connection(chan);
1288 }
79d554a6
MH		 1289 } else {
1290 struct l2cap_info_req req;
ac73498c 1291 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 1292
1293 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1294 conn->info_ident = l2cap_get_ident(conn);
1295
ba13ccd9 1296 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 1297
2d792818
GP		 1298 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1299 sizeof(req), &req);
79d554a6
MH		 1300 }
1301}
1302
cf6c2c0b
GP		 1303static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1304{
1305 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 1306 if (!disable_ertm)
cf6c2c0b
GP		 1307 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1308
1309 switch (mode) {
1310 case L2CAP_MODE_ERTM:
1311 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1312 case L2CAP_MODE_STREAMING:
1313 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1314 default:
1315 return 0x00;
1316 }
1317}
1318
5e4e3972 1319static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
22121fc9 1320{
5e4e3972 1321 struct l2cap_conn *conn = chan->conn;
22121fc9
GP		 1322 struct l2cap_disconn_req req;
1323
c13ffa62
GP		 1324 if (!conn)
1325 return;
1326
aad3d0e3 1327 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1a09bcb9
GP		 1328 __clear_retrans_timer(chan);
1329 __clear_monitor_timer(chan);
1330 __clear_ack_timer(chan);
c13ffa62
GP		 1331 }
1332
416fa752 1333 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
d117773c 1334 l2cap_state_change(chan, BT_DISCONN);
416fa752
AE		 1335 return;
1336 }
1337
fe4128e0
GP		 1338 req.dcid = cpu_to_le16(chan->dcid);
1339 req.scid = cpu_to_le16(chan->scid);
2d792818
GP		 1340 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1341 sizeof(req), &req);
c13ffa62 1342
f8e73017 1343 l2cap_state_change_and_error(chan, BT_DISCONN, err);
22121fc9
GP		 1344}
1345
1da177e4 1346/* ---- L2CAP connections ---- */
4e8402a3
MH		 1347static void l2cap_conn_start(struct l2cap_conn *conn)
1348{
3df91ea2 1349 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 1350
1351 BT_DBG("conn %p", conn);
1352
3df91ea2 1353 mutex_lock(&conn->chan_lock);
4e8402a3 1354
3df91ea2 1355 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
6be36555 1356 l2cap_chan_lock(chan);
4e8402a3 1357
715ec005 1358 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
6be36555 1359 l2cap_chan_unlock(chan);
79d554a6
MH		 1360 continue;
1361 }
1362
89bc500e 1363 if (chan->state == BT_CONNECT) {
d45fc423 1364 if (!l2cap_chan_check_security(chan) ||
2d792818 1365 !__l2cap_no_conn_pending(chan)) {
6be36555 1366 l2cap_chan_unlock(chan);
47731de7
GP		 1367 continue;
1368 }
79d554a6 1369
c1360a1c 1370 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
2d792818 1371 && test_bit(CONF_STATE2_DEVICE,
c1360a1c 1372 &chan->conf_state)) {
89bc500e 1373 l2cap_chan_close(chan, ECONNRESET);
6be36555 1374 l2cap_chan_unlock(chan);
47731de7 1375 continue;
b1235d79 1376 }
47731de7 1377
93c3e8f5 1378 l2cap_start_connection(chan);
47731de7 1379
89bc500e 1380 } else if (chan->state == BT_CONNECT2) {
79d554a6 1381 struct l2cap_conn_rsp rsp;
e9aeb2dd 1382 char buf[128];
fe4128e0
GP		 1383 rsp.scid = cpu_to_le16(chan->dcid);
1384 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 1385
d45fc423 1386 if (l2cap_chan_check_security(chan)) {
bdc25783 1387 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
ac73498c
AE		 1388 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1389 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
2dc4e510 1390 chan->ops->defer(chan);
f66dc81f
MH		 1391
1392 } else {
acdcabf5 1393 l2cap_state_change(chan, BT_CONFIG);
ac73498c
AE		 1394 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1395 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
f66dc81f 1396 }
79d554a6 1397 } else {
ac73498c
AE		 1398 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1399 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
79d554a6
MH		 1400 }
1401
fc7f8a7e 1402 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 1403 sizeof(rsp), &rsp);
e9aeb2dd 1404
c1360a1c 1405 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
2d792818 1406 rsp.result != L2CAP_CR_SUCCESS) {
6be36555 1407 l2cap_chan_unlock(chan);
e9aeb2dd
GP		 1408 continue;
1409 }
1410
c1360a1c 1411 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 1412 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 1413 l2cap_build_conf_req(chan, buf), buf);
73ffa904 1414 chan->num_conf_req++;
4e8402a3
MH		 1415 }
1416
6be36555 1417 l2cap_chan_unlock(chan);
4e8402a3
MH		 1418 }
1419
3df91ea2 1420 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1421}
1422
c2287681 1423/* Find socket with cid and source/destination bdaddr.
b62f328b
VT		 1424 * Returns closest match, locked.
1425 */
d9b88702 1426static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
c2287681
IY		 1427 bdaddr_t *src,
1428 bdaddr_t *dst)
b62f328b 1429{
23691d75 1430 struct l2cap_chan *c, *c1 = NULL;
b62f328b 1431
23691d75 1432 read_lock(&chan_list_lock);
b62f328b 1433
23691d75 1434 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1435 if (state && c->state != state)
b62f328b
VT		 1436 continue;
1437
23691d75 1438 if (c->scid == cid) {
c2287681
IY		 1439 int src_match, dst_match;
1440 int src_any, dst_any;
1441
b62f328b 1442 /* Exact match. */
7eafc59e
MH		 1443 src_match = !bacmp(&c->src, src);
1444 dst_match = !bacmp(&c->dst, dst);
c2287681 1445 if (src_match && dst_match) {
23691d75
GP		 1446 read_unlock(&chan_list_lock);
1447 return c;
1448 }
b62f328b
VT		 1449
1450 /* Closest match */
7eafc59e
MH		 1451 src_any = !bacmp(&c->src, BDADDR_ANY);
1452 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1453 if ((src_match && dst_any) || (src_any && dst_match) ||
1454 (src_any && dst_any))
23691d75 1455 c1 = c;
b62f328b
VT		 1456 }
1457 }
280f294f 1458
23691d75 1459 read_unlock(&chan_list_lock);
b62f328b 1460
23691d75 1461 return c1;
b62f328b
VT		 1462}
1463
1464static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1465{
cc8dba2b 1466 struct hci_conn *hcon = conn->hcon;
23691d75 1467 struct l2cap_chan *chan, *pchan;
cc8dba2b 1468 u8 dst_type;
b62f328b
VT		 1469
1470 BT_DBG("");
1471
18722c24
JR		 1472 bt_6lowpan_add_conn(conn);
1473
b62f328b 1474 /* Check if we have socket listening on cid */
073d1cf3 1475 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
cc8dba2b 1476 &hcon->src, &hcon->dst);
23691d75 1477 if (!pchan)
b62f328b
VT		 1478 return;
1479
44f3b0fb
JH		 1480 /* Client ATT sockets should override the server one */
1481 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1482 return;
1483
cc8dba2b
MH		 1484 dst_type = bdaddr_type(hcon, hcon->dst_type);
1485
1486 /* If device is blocked, do not create a channel for it */
1487 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type))
1488 return;
1489
8ffb9290 1490 l2cap_chan_lock(pchan);
62f3a2cf 1491
80b98027 1492 chan = pchan->ops->new_connection(pchan);
80808e43 1493 if (!chan)
b62f328b
VT		 1494 goto clean;
1495
9f22398c
JH		 1496 chan->dcid = L2CAP_CID_ATT;
1497
cc8dba2b
MH		 1498 bacpy(&chan->src, &hcon->src);
1499 bacpy(&chan->dst, &hcon->dst);
1500 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1501 chan->dst_type = dst_type;
b62f328b 1502
44f3b0fb 1503 __l2cap_chan_add(conn, chan);
48454079 1504
b62f328b 1505clean:
8ffb9290 1506 l2cap_chan_unlock(pchan);
b62f328b
VT		 1507}
1508
4e8402a3
MH		 1509static void l2cap_conn_ready(struct l2cap_conn *conn)
1510{
48454079 1511 struct l2cap_chan *chan;
cc110922 1512 struct hci_conn *hcon = conn->hcon;
4e8402a3 1513
79d554a6 1514 BT_DBG("conn %p", conn);
4e8402a3 1515
d8729922
JH		 1516 /* For outgoing pairing which doesn't necessarily have an
1517 * associated socket (e.g. mgmt_pair_device).
1518 */
cc110922
VCG		 1519 if (hcon->out && hcon->type == LE_LINK)
1520 smp_conn_security(hcon, hcon->pending_sec_level);
160dc6ac 1521
3df91ea2 1522 mutex_lock(&conn->chan_lock);
4e8402a3 1523
44f3b0fb
JH		 1524 if (hcon->type == LE_LINK)
1525 l2cap_le_conn_ready(conn);
1526
3df91ea2 1527 list_for_each_entry(chan, &conn->chan_l, list) {
baa7e1fa 1528
6be36555 1529 l2cap_chan_lock(chan);
4e8402a3 1530
416fa752
AE		 1531 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1532 l2cap_chan_unlock(chan);
1533 continue;
1534 }
1535
cc110922 1536 if (hcon->type == LE_LINK) {
f1496dee 1537 l2cap_le_start(chan);
63128451 1538 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
74e75740 1539 l2cap_chan_ready(chan);
b501d6a1 1540
1c244f79 1541 } else if (chan->state == BT_CONNECT) {
fc7f8a7e 1542 l2cap_do_start(chan);
1c244f79 1543 }
4e8402a3 1544
6be36555 1545 l2cap_chan_unlock(chan);
4e8402a3 1546 }
79d554a6 1547
3df91ea2 1548 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1549}
1550
1551/* Notify sockets that we cannot guaranty reliability anymore */
1552static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1553{
48454079 1554 struct l2cap_chan *chan;
4e8402a3
MH		 1555
1556 BT_DBG("conn %p", conn);
1557
3df91ea2 1558 mutex_lock(&conn->chan_lock);
4e8402a3 1559
3df91ea2 1560 list_for_each_entry(chan, &conn->chan_l, list) {
ecf61bdb 1561 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1d8b1fd5 1562 l2cap_chan_set_err(chan, err);
4e8402a3
MH		 1563 }
1564
3df91ea2 1565 mutex_unlock(&conn->chan_lock);
4e8402a3
MH		 1566}
1567
f878fcad 1568static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 1569{
f878fcad 1570 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1571 info_timer.work);
4e8402a3 1572
984947dc 1573 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 1574 conn->info_ident = 0;
984947dc 1575
4e8402a3
MH		 1576 l2cap_conn_start(conn);
1577}
1578
2c8e1411
DH		 1579/*
1580 * l2cap_user
1581 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1582 * callback is called during registration. The ->remove callback is called
1583 * during unregistration.
1584 * An l2cap_user object can either be explicitly unregistered or when the
1585 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1586 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1587 * External modules must own a reference to the l2cap_conn object if they intend
1588 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1589 * any time if they don't.
1590 */
1591
1592int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1593{
1594 struct hci_dev *hdev = conn->hcon->hdev;
1595 int ret;
1596
1597 /* We need to check whether l2cap_conn is registered. If it is not, we
1598 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1599 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1600 * relies on the parent hci_conn object to be locked. This itself relies
1601 * on the hci_dev object to be locked. So we must lock the hci device
1602 * here, too. */
1603
1604 hci_dev_lock(hdev);
1605
1606 if (user->list.next || user->list.prev) {
1607 ret = -EINVAL;
1608 goto out_unlock;
1609 }
1610
1611 /* conn->hchan is NULL after l2cap_conn_del() was called */
1612 if (!conn->hchan) {
1613 ret = -ENODEV;
1614 goto out_unlock;
1615 }
1616
1617 ret = user->probe(conn, user);
1618 if (ret)
1619 goto out_unlock;
1620
1621 list_add(&user->list, &conn->users);
1622 ret = 0;
1623
1624out_unlock:
1625 hci_dev_unlock(hdev);
1626 return ret;
1627}
1628EXPORT_SYMBOL(l2cap_register_user);
1629
1630void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1631{
1632 struct hci_dev *hdev = conn->hcon->hdev;
1633
1634 hci_dev_lock(hdev);
1635
1636 if (!user->list.next || !user->list.prev)
1637 goto out_unlock;
1638
1639 list_del(&user->list);
1640 user->list.next = NULL;
1641 user->list.prev = NULL;
1642 user->remove(conn, user);
1643
1644out_unlock:
1645 hci_dev_unlock(hdev);
1646}
1647EXPORT_SYMBOL(l2cap_unregister_user);
1648
1649static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1650{
1651 struct l2cap_user *user;
1652
1653 while (!list_empty(&conn->users)) {
1654 user = list_first_entry(&conn->users, struct l2cap_user, list);
1655 list_del(&user->list);
1656 user->list.next = NULL;
1657 user->list.prev = NULL;
1658 user->remove(conn, user);
1659 }
1660}
1661
5d3de7df
VCG		 1662static void l2cap_conn_del(struct hci_conn *hcon, int err)
1663{
1664 struct l2cap_conn *conn = hcon->l2cap_data;
1665 struct l2cap_chan *chan, *l;
5d3de7df
VCG		 1666
1667 if (!conn)
1668 return;
1669
1670 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1671
1672 kfree_skb(conn->rx_skb);
1673
2c8e1411
DH		 1674 l2cap_unregister_all_users(conn);
1675
3df91ea2
AE		 1676 mutex_lock(&conn->chan_lock);
1677
5d3de7df
VCG		 1678 /* Kill channels */
1679 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
61d6ef3e 1680 l2cap_chan_hold(chan);
6be36555
AE		 1681 l2cap_chan_lock(chan);
1682
5d3de7df 1683 l2cap_chan_del(chan, err);
6be36555
AE		 1684
1685 l2cap_chan_unlock(chan);
1686
80b98027 1687 chan->ops->close(chan);
61d6ef3e 1688 l2cap_chan_put(chan);
5d3de7df
VCG		 1689 }
1690
3df91ea2
AE		 1691 mutex_unlock(&conn->chan_lock);
1692
73d80deb
LAD		 1693 hci_chan_del(conn->hchan);
1694
5d3de7df 1695 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
127074bf 1696 cancel_delayed_work_sync(&conn->info_timer);
5d3de7df 1697
51a8efd7 1698 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
127074bf 1699 cancel_delayed_work_sync(&conn->security_timer);
8aab4757 1700 smp_chan_destroy(conn);
d26a2345 1701 }
5d3de7df
VCG		 1702
1703 hcon->l2cap_data = NULL;
9c903e37
DH		 1704 conn->hchan = NULL;
1705 l2cap_conn_put(conn);
5d3de7df
VCG		 1706}
1707
6c9d42a1 1708static void security_timeout(struct work_struct *work)
5d3de7df 1709{
6c9d42a1 1710 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
2d792818 1711 security_timer.work);
5d3de7df 1712
d06cc416
JH		 1713 BT_DBG("conn %p", conn);
1714
1715 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1716 smp_chan_destroy(conn);
1717 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1718 }
5d3de7df
VCG		 1719}
1720
baf43251 1721static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
1da177e4 1722{
0139418c 1723 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1724 struct hci_chan *hchan;
1da177e4 1725
baf43251 1726 if (conn)
1da177e4
LT		 1727 return conn;
1728
73d80deb
LAD		 1729 hchan = hci_chan_create(hcon);
1730 if (!hchan)
1731 return NULL;
1732
8bcde1f2 1733 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
73d80deb
LAD		 1734 if (!conn) {
1735 hci_chan_del(hchan);
1da177e4 1736 return NULL;
73d80deb 1737 }
1da177e4 1738
9c903e37 1739 kref_init(&conn->ref);
1da177e4
LT		 1740 hcon->l2cap_data = conn;
1741 conn->hcon = hcon;
9c903e37 1742 hci_conn_get(conn->hcon);
73d80deb 1743 conn->hchan = hchan;
1da177e4 1744
73d80deb 1745 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1746
dcc042d5 1747 switch (hcon->type) {
dcc042d5
AE		 1748 case LE_LINK:
1749 if (hcon->hdev->le_mtu) {
1750 conn->mtu = hcon->hdev->le_mtu;
1751 break;
1752 }
1753 /* fall through */
dcc042d5 1754 default:
acd7d370 1755 conn->mtu = hcon->hdev->acl_mtu;
dcc042d5
AE		 1756 break;
1757 }
acd7d370 1758
4e8402a3
MH		 1759 conn->feat_mask = 0;
1760
848566b3
MH		 1761 if (hcon->type == ACL_LINK)
1762 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
1763 &hcon->hdev->dev_flags);
1764
1da177e4 1765 spin_lock_init(&conn->lock);
3df91ea2 1766 mutex_init(&conn->chan_lock);
baa7e1fa
GP		 1767
1768 INIT_LIST_HEAD(&conn->chan_l);
2c8e1411 1769 INIT_LIST_HEAD(&conn->users);
1da177e4 1770
5d3de7df 1771 if (hcon->type == LE_LINK)
6c9d42a1 1772 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1773 else
030013d8 1774 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1775
9f5a0d7b 1776 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1777
1da177e4
LT		 1778 return conn;
1779}
1780
9c903e37
DH		 1781static void l2cap_conn_free(struct kref *ref)
1782{
1783 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1784
1785 hci_conn_put(conn->hcon);
1786 kfree(conn);
1787}
1788
1789void l2cap_conn_get(struct l2cap_conn *conn)
1790{
1791 kref_get(&conn->ref);
1792}
1793EXPORT_SYMBOL(l2cap_conn_get);
1794
1795void l2cap_conn_put(struct l2cap_conn *conn)
1796{
1797 kref_put(&conn->ref, l2cap_conn_free);
1798}
1799EXPORT_SYMBOL(l2cap_conn_put);
1800
1da177e4 1801/* ---- Socket interface ---- */
1da177e4 1802
c2287681 1803/* Find socket with psm and source / destination bdaddr.
1da177e4
LT		 1804 * Returns closest match.
1805 */
c2287681
IY		 1806static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1807 bdaddr_t *src,
bf20fd4e
JH		 1808 bdaddr_t *dst,
1809 u8 link_type)
1da177e4 1810{
23691d75 1811 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1812
23691d75 1813 read_lock(&chan_list_lock);
e0f0cb56 1814
23691d75 1815 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 1816 if (state && c->state != state)
1da177e4
LT		 1817 continue;
1818
bf20fd4e
JH		 1819 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1820 continue;
1821
1822 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1823 continue;
1824
23691d75 1825 if (c->psm == psm) {
c2287681
IY		 1826 int src_match, dst_match;
1827 int src_any, dst_any;
1828
1da177e4 1829 /* Exact match. */
7eafc59e
MH		 1830 src_match = !bacmp(&c->src, src);
1831 dst_match = !bacmp(&c->dst, dst);
c2287681 1832 if (src_match && dst_match) {
a7567b20 1833 read_unlock(&chan_list_lock);
23691d75
GP		 1834 return c;
1835 }
1da177e4
LT		 1836
1837 /* Closest match */
7eafc59e
MH		 1838 src_any = !bacmp(&c->src, BDADDR_ANY);
1839 dst_any = !bacmp(&c->dst, BDADDR_ANY);
c2287681
IY		 1840 if ((src_match && dst_any) || (src_any && dst_match) ||
1841 (src_any && dst_any))
23691d75 1842 c1 = c;
1da177e4
LT		 1843 }
1844 }
1da177e4 1845
23691d75 1846 read_unlock(&chan_list_lock);
e0f0cb56 1847
23691d75 1848 return c1;
1da177e4
LT		 1849}
1850
4946096d
JH		 1851static bool is_valid_psm(u16 psm, u8 dst_type)
1852{
1853 if (!psm)
1854 return false;
1855
1856 if (bdaddr_type_is_le(dst_type))
c8afe8d0 1857 return (psm <= 0x00ff);
4946096d
JH		 1858
1859 /* PSM must be odd and lsb of upper byte must be 0 */
1860 return ((psm & 0x0101) == 0x0001);
1861}
1862
8e9f9892
AG		 1863int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1864 bdaddr_t *dst, u8 dst_type)
1da177e4 1865{
1da177e4
LT		 1866 struct l2cap_conn *conn;
1867 struct hci_conn *hcon;
1868 struct hci_dev *hdev;
09ab6f4c 1869 __u8 auth_type;
44d0e48e 1870 int err;
1da177e4 1871
7eafc59e 1872 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
ab19516a 1873 dst_type, __le16_to_cpu(psm));
1da177e4 1874
7eafc59e 1875 hdev = hci_get_route(dst, &chan->src);
af05b30b 1876 if (!hdev)
1da177e4
LT		 1877 return -EHOSTUNREACH;
1878
09fd0de5 1879 hci_dev_lock(hdev);
1da177e4 1880
6be36555 1881 l2cap_chan_lock(chan);
03a00194 1882
4946096d 1883 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
2d792818 1884 chan->chan_type != L2CAP_CHAN_RAW) {
03a00194
GP		 1885 err = -EINVAL;
1886 goto done;
1887 }
1888
1889 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1890 err = -EINVAL;
1891 goto done;
1892 }
1893
1894 switch (chan->mode) {
1895 case L2CAP_MODE_BASIC:
0ce43ce6 1896 break;
38319713 1897 case L2CAP_MODE_LE_FLOWCTL:
0ce43ce6 1898 l2cap_le_flowctl_init(chan);
03a00194
GP		 1899 break;
1900 case L2CAP_MODE_ERTM:
1901 case L2CAP_MODE_STREAMING:
1902 if (!disable_ertm)
1903 break;
1904 /* fall through */
1905 default:
1906 err = -ENOTSUPP;
1907 goto done;
1908 }
1909
0797e01d 1910 switch (chan->state) {
03a00194
GP		 1911 case BT_CONNECT:
1912 case BT_CONNECT2:
1913 case BT_CONFIG:
1914 /* Already connecting */
1915 err = 0;
1916 goto done;
1917
1918 case BT_CONNECTED:
1919 /* Already connected */
1920 err = -EISCONN;
1921 goto done;
1922
1923 case BT_OPEN:
1924 case BT_BOUND:
1925 /* Can connect */
1926 break;
1927
1928 default:
1929 err = -EBADFD;
1930 goto done;
1931 }
1932
1933 /* Set destination address and psm */
7eafc59e 1934 bacpy(&chan->dst, dst);
4f1654e0 1935 chan->dst_type = dst_type;
6be36555 1936
03a00194
GP		 1937 chan->psm = psm;
1938 chan->dcid = cid;
1da177e4 1939
4343478f 1940 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1941
f224ca5f 1942 if (bdaddr_type_is_le(dst_type))
8e9f9892 1943 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
b12f62cf 1944 chan->sec_level, auth_type);
acd7d370 1945 else
8e9f9892 1946 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
b12f62cf 1947 chan->sec_level, auth_type);
acd7d370 1948
30e76272
VT		 1949 if (IS_ERR(hcon)) {
1950 err = PTR_ERR(hcon);
1da177e4 1951 goto done;
30e76272 1952 }
1da177e4 1953
baf43251 1954 conn = l2cap_conn_add(hcon);
1da177e4 1955 if (!conn) {
76a68ba0 1956 hci_conn_drop(hcon);
30e76272 1957 err = -ENOMEM;
1da177e4
LT		 1958 goto done;
1959 }
1960
141d5706
JH		 1961 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
1962 hci_conn_drop(hcon);
1963 err = -EBUSY;
1964 goto done;
9f0caeb1
VCG		 1965 }
1966
1da177e4 1967 /* Update source addr of the socket */
7eafc59e 1968 bacpy(&chan->src, &hcon->src);
4f1654e0 1969 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1da177e4 1970
6be36555 1971 l2cap_chan_unlock(chan);
48454079 1972 l2cap_chan_add(conn, chan);
6be36555 1973 l2cap_chan_lock(chan);
48454079 1974
5ee9891d
JH		 1975 /* l2cap_chan_add takes its own ref so we can drop this one */
1976 hci_conn_drop(hcon);
1977
6be36555 1978 l2cap_state_change(chan, BT_CONNECT);
8d836d71 1979 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4
LT		 1980
1981 if (hcon->state == BT_CONNECTED) {
715ec005 1982 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1983 __clear_chan_timer(chan);
d45fc423 1984 if (l2cap_chan_check_security(chan))
6be36555 1985 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1986 } else
fc7f8a7e 1987 l2cap_do_start(chan);
1da177e4
LT		 1988 }
1989
30e76272
VT		 1990 err = 0;
1991
1da177e4 1992done:
6be36555 1993 l2cap_chan_unlock(chan);
09fd0de5 1994 hci_dev_unlock(hdev);
1da177e4
LT		 1995 hci_dev_put(hdev);
1996 return err;
1997}
1998
721c4181 1999static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 2000{
721c4181 2001 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 2002 monitor_timer.work);
e90bac06 2003
525cd185 2004 BT_DBG("chan %p", chan);
0e98958d 2005
6be36555
AE		 2006 l2cap_chan_lock(chan);
2007
80909e04 2008 if (!chan->conn) {
6be36555 2009 l2cap_chan_unlock(chan);
8d7e1c7f 2010 l2cap_chan_put(chan);
e90bac06
GP		 2011 return;
2012 }
2013
401bb1f7 2014 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
e90bac06 2015
6be36555 2016 l2cap_chan_unlock(chan);
8d7e1c7f 2017 l2cap_chan_put(chan);
e90bac06
GP		 2018}
2019
721c4181 2020static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 2021{
721c4181 2022 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
4239d16f 2023 retrans_timer.work);
e90bac06 2024
49208c9c 2025 BT_DBG("chan %p", chan);
0e98958d 2026
6be36555
AE		 2027 l2cap_chan_lock(chan);
2028
80909e04
MM		 2029 if (!chan->conn) {
2030 l2cap_chan_unlock(chan);
2031 l2cap_chan_put(chan);
2032 return;
2033 }
6be36555 2034
401bb1f7 2035 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
6be36555 2036 l2cap_chan_unlock(chan);
8d7e1c7f 2037 l2cap_chan_put(chan);
e90bac06
GP		 2038}
2039
d660366d
GP		 2040static void l2cap_streaming_send(struct l2cap_chan *chan,
2041 struct sk_buff_head *skbs)
6840ed07 2042{
ccbb84af 2043 struct sk_buff *skb;
3733937d 2044 struct l2cap_ctrl *control;
6840ed07 2045
3733937d
MM		 2046 BT_DBG("chan %p, skbs %p", chan, skbs);
2047
b99e13ad
MM		 2048 if (__chan_is_moving(chan))
2049 return;
2050
3733937d
MM		 2051 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2052
2053 while (!skb_queue_empty(&chan->tx_q)) {
2054
2055 skb = skb_dequeue(&chan->tx_q);
2056
2057 bt_cb(skb)->control.retries = 1;
2058 control = &bt_cb(skb)->control;
2059
2060 control->reqseq = 0;
2061 control->txseq = chan->next_tx_seq;
2062
2063 __pack_control(chan, control, skb);
6840ed07 2064
47d1ec61 2065 if (chan->fcs == L2CAP_FCS_CRC16) {
3733937d
MM		 2066 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
2067 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 2068 }
2069
4343478f 2070 l2cap_do_send(chan, skb);
6840ed07 2071
b4400672 2072 BT_DBG("Sent txseq %u", control->txseq);
3733937d 2073
836be934 2074 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
3733937d 2075 chan->frames_sent++;
6840ed07 2076 }
6840ed07
GP		 2077}
2078
67c9e840 2079static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 2080{
2081 struct sk_buff *skb, *tx_skb;
18a48e76
MM		 2082 struct l2cap_ctrl *control;
2083 int sent = 0;
2084
2085 BT_DBG("chan %p", chan);
1c2acffb 2086
89bc500e 2087 if (chan->state != BT_CONNECTED)
c13ffa62 2088 return -ENOTCONN;
e90bac06 2089
94122bbe
MM		 2090 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2091 return 0;
2092
b99e13ad
MM		 2093 if (__chan_is_moving(chan))
2094 return 0;
2095
18a48e76
MM		 2096 while (chan->tx_send_head &&
2097 chan->unacked_frames < chan->remote_tx_win &&
2098 chan->tx_state == L2CAP_TX_STATE_XMIT) {
e420aba3 2099
18a48e76 2100 skb = chan->tx_send_head;
e90bac06 2101
18a48e76
MM		 2102 bt_cb(skb)->control.retries = 1;
2103 control = &bt_cb(skb)->control;
95ffa978 2104
e2ab4353 2105 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
18a48e76 2106 control->final = 1;
e2ab4353 2107
18a48e76
MM		 2108 control->reqseq = chan->buffer_seq;
2109 chan->last_acked_seq = chan->buffer_seq;
2110 control->txseq = chan->next_tx_seq;
1c2acffb 2111
18a48e76 2112 __pack_control(chan, control, skb);
e90bac06 2113
47d1ec61 2114 if (chan->fcs == L2CAP_FCS_CRC16) {
18a48e76
MM		 2115 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
2116 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 2117 }
2118
18a48e76
MM		 2119 /* Clone after data has been modified. Data is assumed to be
2120 read-only (for locking purposes) on cloned sk_buffs.
2121 */
2122 tx_skb = skb_clone(skb, GFP_KERNEL);
9a9c6a34 2123
18a48e76
MM		 2124 if (!tx_skb)
2125 break;
1c2acffb 2126
18a48e76 2127 __set_retrans_timer(chan);
836be934
AE		 2128
2129 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
18a48e76 2130 chan->unacked_frames++;
6a026610 2131 chan->frames_sent++;
18a48e76 2132 sent++;
1c2acffb 2133
58d35f87
GP		 2134 if (skb_queue_is_last(&chan->tx_q, skb))
2135 chan->tx_send_head = NULL;
1c2acffb 2136 else
58d35f87 2137 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
18a48e76
MM		 2138
2139 l2cap_do_send(chan, tx_skb);
b4400672 2140 BT_DBG("Sent txseq %u", control->txseq);
1c2acffb
GP		 2141 }
2142
b4400672
AE		 2143 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
2144 chan->unacked_frames, skb_queue_len(&chan->tx_q));
18a48e76
MM		 2145
2146 return sent;
9e917af1
GP		 2147}
2148
e1fbd4c1
MM		 2149static void l2cap_ertm_resend(struct l2cap_chan *chan)
2150{
2151 struct l2cap_ctrl control;
2152 struct sk_buff *skb;
2153 struct sk_buff *tx_skb;
2154 u16 seq;
2155
2156 BT_DBG("chan %p", chan);
2157
2158 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2159 return;
2160
b99e13ad
MM		 2161 if (__chan_is_moving(chan))
2162 return;
2163
e1fbd4c1
MM		 2164 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
2165 seq = l2cap_seq_list_pop(&chan->retrans_list);
2166
2167 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
2168 if (!skb) {
2169 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2d792818 2170 seq);
e1fbd4c1
MM		 2171 continue;
2172 }
2173
2174 bt_cb(skb)->control.retries++;
2175 control = bt_cb(skb)->control;
2176
2177 if (chan->max_tx != 0 &&
2178 bt_cb(skb)->control.retries > chan->max_tx) {
2179 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 2180 l2cap_send_disconn_req(chan, ECONNRESET);
e1fbd4c1
MM		 2181 l2cap_seq_list_clear(&chan->retrans_list);
2182 break;
2183 }
2184
2185 control.reqseq = chan->buffer_seq;
2186 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2187 control.final = 1;
2188 else
2189 control.final = 0;
2190
2191 if (skb_cloned(skb)) {
2192 /* Cloned sk_buffs are read-only, so we need a
2193 * writeable copy
2194 */
8bcde1f2 2195 tx_skb = skb_copy(skb, GFP_KERNEL);
e1fbd4c1 2196 } else {
8bcde1f2 2197 tx_skb = skb_clone(skb, GFP_KERNEL);
e1fbd4c1
MM		 2198 }
2199
2200 if (!tx_skb) {
2201 l2cap_seq_list_clear(&chan->retrans_list);
2202 break;
2203 }
2204
2205 /* Update skb contents */
2206 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2207 put_unaligned_le32(__pack_extended_control(&control),
2208 tx_skb->data + L2CAP_HDR_SIZE);
2209 } else {
2210 put_unaligned_le16(__pack_enhanced_control(&control),
2211 tx_skb->data + L2CAP_HDR_SIZE);
2212 }
2213
2214 if (chan->fcs == L2CAP_FCS_CRC16) {
2215 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2216 put_unaligned_le16(fcs, skb_put(tx_skb,
2217 L2CAP_FCS_SIZE));
2218 }
2219
2220 l2cap_do_send(chan, tx_skb);
2221
2222 BT_DBG("Resent txseq %d", control.txseq);
2223
2224 chan->last_acked_seq = chan->buffer_seq;
2225 }
2226}
2227
f80842a8
MM		 2228static void l2cap_retransmit(struct l2cap_chan *chan,
2229 struct l2cap_ctrl *control)
2230{
2231 BT_DBG("chan %p, control %p", chan, control);
2232
2233 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2234 l2cap_ertm_resend(chan);
2235}
2236
d2a7ac5d
MM		 2237static void l2cap_retransmit_all(struct l2cap_chan *chan,
2238 struct l2cap_ctrl *control)
2239{
e1fbd4c1
MM		 2240 struct sk_buff *skb;
2241
2242 BT_DBG("chan %p, control %p", chan, control);
2243
2244 if (control->poll)
2245 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2246
2247 l2cap_seq_list_clear(&chan->retrans_list);
2248
2249 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2250 return;
2251
2252 if (chan->unacked_frames) {
2253 skb_queue_walk(&chan->tx_q, skb) {
2254 if (bt_cb(skb)->control.txseq == control->reqseq ||
2d792818 2255 skb == chan->tx_send_head)
e1fbd4c1
MM		 2256 break;
2257 }
2258
2259 skb_queue_walk_from(&chan->tx_q, skb) {
2260 if (skb == chan->tx_send_head)
2261 break;
2262
2263 l2cap_seq_list_append(&chan->retrans_list,
2264 bt_cb(skb)->control.txseq);
2265 }
2266
2267 l2cap_ertm_resend(chan);
2268 }
d2a7ac5d
MM		 2269}
2270
0a0aba42 2271static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 2272{
0a0aba42
MM		 2273 struct l2cap_ctrl control;
2274 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2275 chan->last_acked_seq);
2276 int threshold;
9e917af1 2277
0a0aba42
MM		 2278 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2279 chan, chan->last_acked_seq, chan->buffer_seq);
9e917af1 2280
0a0aba42
MM		 2281 memset(&control, 0, sizeof(control));
2282 control.sframe = 1;
dfc909be 2283
0a0aba42
MM		 2284 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2285 chan->rx_state == L2CAP_RX_STATE_RECV) {
2286 __clear_ack_timer(chan);
2287 control.super = L2CAP_SUPER_RNR;
2288 control.reqseq = chan->buffer_seq;
2289 l2cap_send_sframe(chan, &control);
2290 } else {
2291 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2292 l2cap_ertm_send(chan);
2293 /* If any i-frames were sent, they included an ack */
2294 if (chan->buffer_seq == chan->last_acked_seq)
2295 frames_to_ack = 0;
2296 }
dfc909be 2297
c20f8e35 2298 /* Ack now if the window is 3/4ths full.
0a0aba42
MM		 2299 * Calculate without mul or div
2300 */
c20f8e35 2301 threshold = chan->ack_win;
0a0aba42
MM		 2302 threshold += threshold << 1;
2303 threshold >>= 2;
2304
b4400672 2305 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
0a0aba42
MM		 2306 threshold);
2307
2308 if (frames_to_ack >= threshold) {
2309 __clear_ack_timer(chan);
2310 control.super = L2CAP_SUPER_RR;
2311 control.reqseq = chan->buffer_seq;
2312 l2cap_send_sframe(chan, &control);
2313 frames_to_ack = 0;
2314 }
1c2acffb 2315
0a0aba42
MM		 2316 if (frames_to_ack)
2317 __set_ack_timer(chan);
2318 }
b17e73bb
SJ		 2319}
2320
04124681
GP		 2321static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2322 struct msghdr *msg, int len,
2323 int count, struct sk_buff *skb)
1c2acffb 2324{
0952a57a 2325 struct l2cap_conn *conn = chan->conn;
1c2acffb 2326 struct sk_buff **frag;
90338947 2327 int sent = 0;
1da177e4 2328
59203a21 2329 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 2330 return -EFAULT;
1da177e4
LT		 2331
2332 sent += count;
2333 len -= count;
2334
2335 /* Continuation fragments (no L2CAP header) */
2336 frag = &skb_shinfo(skb)->frag_list;
2337 while (len) {
fbe00700
GP		 2338 struct sk_buff *tmp;
2339
1da177e4
LT		 2340 count = min_t(unsigned int, conn->mtu, len);
2341
fbe00700
GP		 2342 tmp = chan->ops->alloc_skb(chan, count,
2343 msg->msg_flags & MSG_DONTWAIT);
2344 if (IS_ERR(tmp))
2345 return PTR_ERR(tmp);
2346
2347 *frag = tmp;
2f7719ce 2348
1c2acffb
GP		 2349 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2350 return -EFAULT;
1da177e4 2351
5e59b791
LAD		 2352 (*frag)->priority = skb->priority;
2353
1da177e4
LT		 2354 sent += count;
2355 len -= count;
2356
2d0ed3d5
GP		 2357 skb->len += (*frag)->len;
2358 skb->data_len += (*frag)->len;
2359
1da177e4
LT		 2360 frag = &(*frag)->next;
2361 }
1da177e4
LT		 2362
2363 return sent;
1c2acffb 2364}
1da177e4 2365
5e59b791 2366static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
b4400672
AE		 2367 struct msghdr *msg, size_t len,
2368 u32 priority)
1c2acffb 2369{
8c1d787b 2370 struct l2cap_conn *conn = chan->conn;
1c2acffb 2371 struct sk_buff *skb;
03a51213 2372 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 2373 struct l2cap_hdr *lh;
2374
43b1b8df
MH		 2375 BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan,
2376 __le16_to_cpu(chan->psm), len, priority);
1c2acffb
GP		 2377
2378 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2379
2380 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2381 msg->msg_flags & MSG_DONTWAIT);
2382 if (IS_ERR(skb))
2383 return skb;
1c2acffb 2384
5e59b791
LAD		 2385 skb->priority = priority;
2386
1c2acffb
GP		 2387 /* Create L2CAP header */
2388 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2389 lh->cid = cpu_to_le16(chan->dcid);
daf6a78c 2390 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
43b1b8df 2391 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
1c2acffb 2392
0952a57a 2393 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2394 if (unlikely(err < 0)) {
2395 kfree_skb(skb);
2396 return ERR_PTR(err);
2397 }
2398 return skb;
2399}
2400
5e59b791 2401static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
b4400672
AE		 2402 struct msghdr *msg, size_t len,
2403 u32 priority)
1c2acffb 2404{
8c1d787b 2405 struct l2cap_conn *conn = chan->conn;
1c2acffb 2406 struct sk_buff *skb;
f2ba7fae 2407 int err, count;
1c2acffb
GP		 2408 struct l2cap_hdr *lh;
2409
b4400672 2410 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2411
f2ba7fae 2412 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2f7719ce 2413
f2ba7fae 2414 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
90338947
GP		 2415 msg->msg_flags & MSG_DONTWAIT);
2416 if (IS_ERR(skb))
2417 return skb;
1c2acffb 2418
5e59b791
LAD		 2419 skb->priority = priority;
2420
1c2acffb
GP		 2421 /* Create L2CAP header */
2422 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2423 lh->cid = cpu_to_le16(chan->dcid);
6ff9b5ef 2424 lh->len = cpu_to_le16(len);
1c2acffb 2425
0952a57a 2426 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2427 if (unlikely(err < 0)) {
2428 kfree_skb(skb);
2429 return ERR_PTR(err);
2430 }
2431 return skb;
2432}
2433
ab0ff76d 2434static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
b4400672
AE		 2435 struct msghdr *msg, size_t len,
2436 u16 sdulen)
1c2acffb 2437{
8c1d787b 2438 struct l2cap_conn *conn = chan->conn;
1c2acffb 2439 struct sk_buff *skb;
e4ca6d98 2440 int err, count, hlen;
1c2acffb
GP		 2441 struct l2cap_hdr *lh;
2442
b4400672 2443 BT_DBG("chan %p len %zu", chan, len);
1c2acffb 2444
0ee0d208
GP		 2445 if (!conn)
2446 return ERR_PTR(-ENOTCONN);
2447
ba7aa64f 2448 hlen = __ertm_hdr_size(chan);
e4ca6d98 2449
c74e560c 2450 if (sdulen)
03a51213 2451 hlen += L2CAP_SDULEN_SIZE;
c74e560c 2452
47d1ec61 2453 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 2454 hlen += L2CAP_FCS_SIZE;
fcc203c3 2455
1c2acffb 2456 count = min_t(unsigned int, (conn->mtu - hlen), len);
2f7719ce
AE		 2457
2458 skb = chan->ops->alloc_skb(chan, count + hlen,
90338947
GP		 2459 msg->msg_flags & MSG_DONTWAIT);
2460 if (IS_ERR(skb))
2461 return skb;
1c2acffb
GP		 2462
2463 /* Create L2CAP header */
2464 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 2465 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 2466 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0 2467
18a48e76
MM		 2468 /* Control header is populated later */
2469 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2470 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2471 else
2472 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
88843ab0 2473
c74e560c 2474 if (sdulen)
03a51213 2475 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb 2476
0952a57a 2477 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
1c2acffb
GP		 2478 if (unlikely(err < 0)) {
2479 kfree_skb(skb);
2480 return ERR_PTR(err);
2481 }
e90bac06 2482
18a48e76 2483 bt_cb(skb)->control.fcs = chan->fcs;
3ce3514f 2484 bt_cb(skb)->control.retries = 0;
1c2acffb 2485 return skb;
1da177e4
LT		 2486}
2487
94122bbe
MM		 2488static int l2cap_segment_sdu(struct l2cap_chan *chan,
2489 struct sk_buff_head *seg_queue,
2490 struct msghdr *msg, size_t len)
c74e560c 2491{
c74e560c 2492 struct sk_buff *skb;
94122bbe
MM		 2493 u16 sdu_len;
2494 size_t pdu_len;
94122bbe 2495 u8 sar;
c74e560c 2496
b4400672 2497 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
c74e560c 2498
94122bbe
MM		 2499 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2500 * so fragmented skbs are not used. The HCI layer's handling
2501 * of fragmented skbs is not compatible with ERTM's queueing.
2502 */
c74e560c 2503
94122bbe
MM		 2504 /* PDU size is derived from the HCI MTU */
2505 pdu_len = chan->conn->mtu;
c74e560c 2506
a549574d
MM		 2507 /* Constrain PDU size for BR/EDR connections */
2508 if (!chan->hs_hcon)
2509 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
94122bbe
MM		 2510
2511 /* Adjust for largest possible L2CAP overhead. */
35d401df
GP		 2512 if (chan->fcs)
2513 pdu_len -= L2CAP_FCS_SIZE;
2514
ba7aa64f 2515 pdu_len -= __ertm_hdr_size(chan);
94122bbe
MM		 2516
2517 /* Remote device may have requested smaller PDUs */
2518 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2519
2520 if (len <= pdu_len) {
2521 sar = L2CAP_SAR_UNSEGMENTED;
2522 sdu_len = 0;
2523 pdu_len = len;
2524 } else {
2525 sar = L2CAP_SAR_START;
2526 sdu_len = len;
2527 pdu_len -= L2CAP_SDULEN_SIZE;
2528 }
2529
2530 while (len > 0) {
2531 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
c74e560c 2532
c74e560c 2533 if (IS_ERR(skb)) {
94122bbe 2534 __skb_queue_purge(seg_queue);
c74e560c
GP		 2535 return PTR_ERR(skb);
2536 }
2537
94122bbe
MM		 2538 bt_cb(skb)->control.sar = sar;
2539 __skb_queue_tail(seg_queue, skb);
2540
2541 len -= pdu_len;
2542 if (sdu_len) {
2543 sdu_len = 0;
2544 pdu_len += L2CAP_SDULEN_SIZE;
2545 }
2546
2547 if (len <= pdu_len) {
2548 sar = L2CAP_SAR_END;
2549 pdu_len = len;
2550 } else {
2551 sar = L2CAP_SAR_CONTINUE;
2552 }
c74e560c 2553 }
c74e560c 2554
f0f62799 2555 return 0;
c74e560c
GP		 2556}
2557
177f8f2b
JH		 2558static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2559 struct msghdr *msg,
2560 size_t len, u16 sdulen)
2561{
2562 struct l2cap_conn *conn = chan->conn;
2563 struct sk_buff *skb;
2564 int err, count, hlen;
2565 struct l2cap_hdr *lh;
2566
2567 BT_DBG("chan %p len %zu", chan, len);
2568
2569 if (!conn)
2570 return ERR_PTR(-ENOTCONN);
2571
2572 hlen = L2CAP_HDR_SIZE;
2573
2574 if (sdulen)
2575 hlen += L2CAP_SDULEN_SIZE;
2576
2577 count = min_t(unsigned int, (conn->mtu - hlen), len);
2578
2579 skb = chan->ops->alloc_skb(chan, count + hlen,
2580 msg->msg_flags & MSG_DONTWAIT);
2581 if (IS_ERR(skb))
2582 return skb;
2583
2584 /* Create L2CAP header */
2585 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2586 lh->cid = cpu_to_le16(chan->dcid);
2587 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2588
2589 if (sdulen)
2590 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2591
2592 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2593 if (unlikely(err < 0)) {
2594 kfree_skb(skb);
2595 return ERR_PTR(err);
2596 }
2597
2598 return skb;
2599}
2600
2601static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2602 struct sk_buff_head *seg_queue,
2603 struct msghdr *msg, size_t len)
2604{
2605 struct sk_buff *skb;
2606 size_t pdu_len;
2607 u16 sdu_len;
2608
2609 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2610
2611 pdu_len = chan->conn->mtu - L2CAP_HDR_SIZE;
2612
2613 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2614
2615 sdu_len = len;
2616 pdu_len -= L2CAP_SDULEN_SIZE;
2617
2618 while (len > 0) {
2619 if (len <= pdu_len)
2620 pdu_len = len;
2621
2622 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2623 if (IS_ERR(skb)) {
2624 __skb_queue_purge(seg_queue);
2625 return PTR_ERR(skb);
2626 }
2627
2628 __skb_queue_tail(seg_queue, skb);
2629
2630 len -= pdu_len;
2631
2632 if (sdu_len) {
2633 sdu_len = 0;
2634 pdu_len += L2CAP_SDULEN_SIZE;
2635 }
2636 }
2637
2638 return 0;
2639}
2640
5e59b791 2641int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2d792818 2642 u32 priority)
9a91a04a 2643{
9a91a04a 2644 struct sk_buff *skb;
9a91a04a 2645 int err;
94122bbe 2646 struct sk_buff_head seg_queue;
9a91a04a 2647
31e8ce80
SWK		 2648 if (!chan->conn)
2649 return -ENOTCONN;
2650
9a91a04a 2651 /* Connectionless channel */
715ec005 2652 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 2653 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 2654 if (IS_ERR(skb))
2655 return PTR_ERR(skb);
2656
2657 l2cap_do_send(chan, skb);
2658 return len;
2659 }
2660
2661 switch (chan->mode) {
38319713 2662 case L2CAP_MODE_LE_FLOWCTL:
177f8f2b
JH		 2663 /* Check outgoing MTU */
2664 if (len > chan->omtu)
2665 return -EMSGSIZE;
2666
fad5fc89
JH		 2667 if (!chan->tx_credits)
2668 return -EAGAIN;
2669
177f8f2b
JH		 2670 __skb_queue_head_init(&seg_queue);
2671
2672 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2673
2674 if (chan->state != BT_CONNECTED) {
2675 __skb_queue_purge(&seg_queue);
2676 err = -ENOTCONN;
2677 }
2678
2679 if (err)
2680 return err;
2681
2682 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2683
2684 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2685 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2686 chan->tx_credits--;
2687 }
2688
2689 if (!chan->tx_credits)
2690 chan->ops->suspend(chan);
2691
2692 err = len;
2693
2694 break;
2695
fad5fc89 2696 case L2CAP_MODE_BASIC:
9a91a04a
GP		 2697 /* Check outgoing MTU */
2698 if (len > chan->omtu)
2699 return -EMSGSIZE;
2700
2701 /* Create a basic PDU */
5e59b791 2702 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 2703 if (IS_ERR(skb))
2704 return PTR_ERR(skb);
2705
2706 l2cap_do_send(chan, skb);
2707 err = len;
2708 break;
2709
2710 case L2CAP_MODE_ERTM:
2711 case L2CAP_MODE_STREAMING:
94122bbe
MM		 2712 /* Check outgoing MTU */
2713 if (len > chan->omtu) {
2714 err = -EMSGSIZE;
2715 break;
2716 }
9a91a04a 2717
94122bbe 2718 __skb_queue_head_init(&seg_queue);
9a91a04a 2719
94122bbe
MM		 2720 /* Do segmentation before calling in to the state machine,
2721 * since it's possible to block while waiting for memory
2722 * allocation.
2723 */
2724 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
9a91a04a 2725
94122bbe
MM		 2726 /* The channel could have been closed while segmenting,
2727 * check that it is still connected.
2728 */
2729 if (chan->state != BT_CONNECTED) {
2730 __skb_queue_purge(&seg_queue);
2731 err = -ENOTCONN;
9a91a04a
GP		 2732 }
2733
94122bbe 2734 if (err)
9a91a04a 2735 break;
9a91a04a 2736
3733937d 2737 if (chan->mode == L2CAP_MODE_ERTM)
d660366d 2738 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
3733937d 2739 else
d660366d 2740 l2cap_streaming_send(chan, &seg_queue);
9a91a04a 2741
d660366d 2742 err = len;
9a91a04a 2743
94122bbe
MM		 2744 /* If the skbs were not queued for sending, they'll still be in
2745 * seg_queue and need to be purged.
2746 */
2747 __skb_queue_purge(&seg_queue);
9a91a04a
GP		 2748 break;
2749
2750 default:
2751 BT_DBG("bad state %1.1x", chan->mode);
2752 err = -EBADFD;
2753 }
2754
2755 return err;
2756}
2757
d2a7ac5d
MM		 2758static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2759{
bed68bde
MM		 2760 struct l2cap_ctrl control;
2761 u16 seq;
2762
b4400672 2763 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2764
2765 memset(&control, 0, sizeof(control));
2766 control.sframe = 1;
2767 control.super = L2CAP_SUPER_SREJ;
2768
2769 for (seq = chan->expected_tx_seq; seq != txseq;
2770 seq = __next_seq(chan, seq)) {
2771 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2772 control.reqseq = seq;
2773 l2cap_send_sframe(chan, &control);
2774 l2cap_seq_list_append(&chan->srej_list, seq);
2775 }
2776 }
2777
2778 chan->expected_tx_seq = __next_seq(chan, txseq);
d2a7ac5d
MM		 2779}
2780
2781static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2782{
bed68bde
MM		 2783 struct l2cap_ctrl control;
2784
2785 BT_DBG("chan %p", chan);
2786
2787 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2788 return;
2789
2790 memset(&control, 0, sizeof(control));
2791 control.sframe = 1;
2792 control.super = L2CAP_SUPER_SREJ;
2793 control.reqseq = chan->srej_list.tail;
2794 l2cap_send_sframe(chan, &control);
d2a7ac5d
MM		 2795}
2796
2797static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2798{
bed68bde
MM		 2799 struct l2cap_ctrl control;
2800 u16 initial_head;
2801 u16 seq;
2802
b4400672 2803 BT_DBG("chan %p, txseq %u", chan, txseq);
bed68bde
MM		 2804
2805 memset(&control, 0, sizeof(control));
2806 control.sframe = 1;
2807 control.super = L2CAP_SUPER_SREJ;
2808
2809 /* Capture initial list head to allow only one pass through the list. */
2810 initial_head = chan->srej_list.head;
2811
2812 do {
2813 seq = l2cap_seq_list_pop(&chan->srej_list);
2814 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2815 break;
2816
2817 control.reqseq = seq;
2818 l2cap_send_sframe(chan, &control);
2819 l2cap_seq_list_append(&chan->srej_list, seq);
2820 } while (chan->srej_list.head != initial_head);
d2a7ac5d
MM		 2821}
2822
608bcc6d
MM		 2823static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2824{
2825 struct sk_buff *acked_skb;
2826 u16 ackseq;
2827
b4400672 2828 BT_DBG("chan %p, reqseq %u", chan, reqseq);
608bcc6d
MM		 2829
2830 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2831 return;
2832
b4400672 2833 BT_DBG("expected_ack_seq %u, unacked_frames %u",
608bcc6d
MM		 2834 chan->expected_ack_seq, chan->unacked_frames);
2835
2836 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2837 ackseq = __next_seq(chan, ackseq)) {
2838
2839 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2840 if (acked_skb) {
2841 skb_unlink(acked_skb, &chan->tx_q);
2842 kfree_skb(acked_skb);
2843 chan->unacked_frames--;
2844 }
2845 }
2846
2847 chan->expected_ack_seq = reqseq;
2848
2849 if (chan->unacked_frames == 0)
2850 __clear_retrans_timer(chan);
2851
b4400672 2852 BT_DBG("unacked_frames %u", chan->unacked_frames);
608bcc6d
MM		 2853}
2854
2855static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2856{
2857 BT_DBG("chan %p", chan);
2858
2859 chan->expected_tx_seq = chan->buffer_seq;
2860 l2cap_seq_list_clear(&chan->srej_list);
2861 skb_queue_purge(&chan->srej_q);
2862 chan->rx_state = L2CAP_RX_STATE_RECV;
2863}
2864
d660366d
GP		 2865static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2866 struct l2cap_ctrl *control,
2867 struct sk_buff_head *skbs, u8 event)
608bcc6d 2868{
608bcc6d
MM		 2869 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2870 event);
2871
2872 switch (event) {
2873 case L2CAP_EV_DATA_REQUEST:
2874 if (chan->tx_send_head == NULL)
2875 chan->tx_send_head = skb_peek(skbs);
2876
2877 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2878 l2cap_ertm_send(chan);
2879 break;
2880 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2881 BT_DBG("Enter LOCAL_BUSY");
2882 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2883
2884 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2885 /* The SREJ_SENT state must be aborted if we are to
2886 * enter the LOCAL_BUSY state.
2887 */
2888 l2cap_abort_rx_srej_sent(chan);
2889 }
2890
2891 l2cap_send_ack(chan);
2892
2893 break;
2894 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2895 BT_DBG("Exit LOCAL_BUSY");
2896 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2897
2898 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2899 struct l2cap_ctrl local_control;
2900
2901 memset(&local_control, 0, sizeof(local_control));
2902 local_control.sframe = 1;
2903 local_control.super = L2CAP_SUPER_RR;
2904 local_control.poll = 1;
2905 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2906 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2907
2908 chan->retry_count = 1;
2909 __set_monitor_timer(chan);
2910 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2911 }
2912 break;
2913 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2914 l2cap_process_reqseq(chan, control->reqseq);
2915 break;
2916 case L2CAP_EV_EXPLICIT_POLL:
2917 l2cap_send_rr_or_rnr(chan, 1);
2918 chan->retry_count = 1;
2919 __set_monitor_timer(chan);
2920 __clear_ack_timer(chan);
2921 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2922 break;
2923 case L2CAP_EV_RETRANS_TO:
2924 l2cap_send_rr_or_rnr(chan, 1);
2925 chan->retry_count = 1;
2926 __set_monitor_timer(chan);
2927 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2928 break;
2929 case L2CAP_EV_RECV_FBIT:
2930 /* Nothing to process */
2931 break;
2932 default:
2933 break;
2934 }
608bcc6d
MM		 2935}
2936
d660366d
GP		 2937static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2938 struct l2cap_ctrl *control,
2939 struct sk_buff_head *skbs, u8 event)
608bcc6d 2940{
608bcc6d
MM		 2941 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2942 event);
2943
2944 switch (event) {
2945 case L2CAP_EV_DATA_REQUEST:
2946 if (chan->tx_send_head == NULL)
2947 chan->tx_send_head = skb_peek(skbs);
2948 /* Queue data, but don't send. */
2949 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2950 break;
2951 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2952 BT_DBG("Enter LOCAL_BUSY");
2953 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2954
2955 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2956 /* The SREJ_SENT state must be aborted if we are to
2957 * enter the LOCAL_BUSY state.
2958 */
2959 l2cap_abort_rx_srej_sent(chan);
2960 }
2961
2962 l2cap_send_ack(chan);
2963
2964 break;
2965 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2966 BT_DBG("Exit LOCAL_BUSY");
2967 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2968
2969 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2970 struct l2cap_ctrl local_control;
2971 memset(&local_control, 0, sizeof(local_control));
2972 local_control.sframe = 1;
2973 local_control.super = L2CAP_SUPER_RR;
2974 local_control.poll = 1;
2975 local_control.reqseq = chan->buffer_seq;
a67d7f6f 2976 l2cap_send_sframe(chan, &local_control);
608bcc6d
MM		 2977
2978 chan->retry_count = 1;
2979 __set_monitor_timer(chan);
2980 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2981 }
2982 break;
2983 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2984 l2cap_process_reqseq(chan, control->reqseq);
2985
2986 /* Fall through */
2987
2988 case L2CAP_EV_RECV_FBIT:
2989 if (control && control->final) {
2990 __clear_monitor_timer(chan);
2991 if (chan->unacked_frames > 0)
2992 __set_retrans_timer(chan);
2993 chan->retry_count = 0;
2994 chan->tx_state = L2CAP_TX_STATE_XMIT;
2995 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2996 }
2997 break;
2998 case L2CAP_EV_EXPLICIT_POLL:
2999 /* Ignore */
3000 break;
3001 case L2CAP_EV_MONITOR_TO:
3002 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
3003 l2cap_send_rr_or_rnr(chan, 1);
3004 __set_monitor_timer(chan);
3005 chan->retry_count++;
3006 } else {
5e4e3972 3007 l2cap_send_disconn_req(chan, ECONNABORTED);
608bcc6d
MM		 3008 }
3009 break;
3010 default:
3011 break;
3012 }
608bcc6d
MM		 3013}
3014
d660366d
GP		 3015static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
3016 struct sk_buff_head *skbs, u8 event)
608bcc6d 3017{
608bcc6d
MM		 3018 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
3019 chan, control, skbs, event, chan->tx_state);
3020
3021 switch (chan->tx_state) {
3022 case L2CAP_TX_STATE_XMIT:
d660366d 3023 l2cap_tx_state_xmit(chan, control, skbs, event);
608bcc6d
MM		 3024 break;
3025 case L2CAP_TX_STATE_WAIT_F:
d660366d 3026 l2cap_tx_state_wait_f(chan, control, skbs, event);
608bcc6d
MM		 3027 break;
3028 default:
3029 /* Ignore event */
3030 break;
3031 }
608bcc6d
MM		 3032}
3033
4b51dae9
MM		 3034static void l2cap_pass_to_tx(struct l2cap_chan *chan,
3035 struct l2cap_ctrl *control)
3036{
3037 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 3038 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
4b51dae9
MM		 3039}
3040
f80842a8
MM		 3041static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
3042 struct l2cap_ctrl *control)
3043{
3044 BT_DBG("chan %p, control %p", chan, control);
401bb1f7 3045 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
f80842a8
MM		 3046}
3047
1da177e4
LT		 3048/* Copy frame to all raw sockets on that connection */
3049static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
3050{
1da177e4 3051 struct sk_buff *nskb;
48454079 3052 struct l2cap_chan *chan;
1da177e4
LT		 3053
3054 BT_DBG("conn %p", conn);
3055
3df91ea2 3056 mutex_lock(&conn->chan_lock);
3d57dc68 3057
3df91ea2 3058 list_for_each_entry(chan, &conn->chan_l, list) {
715ec005 3059 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 3060 continue;
3061
7f5396a7
GP		 3062 /* Don't send frame to the channel it came from */
3063 if (bt_cb(skb)->chan == chan)
1da177e4 3064 continue;
7f5396a7 3065
8bcde1f2 3066 nskb = skb_clone(skb, GFP_KERNEL);
af05b30b 3067 if (!nskb)
1da177e4 3068 continue;
80b98027 3069 if (chan->ops->recv(chan, nskb))
1da177e4
LT		 3070 kfree_skb(nskb);
3071 }
3d57dc68 3072
3df91ea2 3073 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 3074}
3075
3076/* ---- L2CAP signalling commands ---- */
b4400672
AE		 3077static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
3078 u8 ident, u16 dlen, void *data)
1da177e4
LT		 3079{
3080 struct sk_buff *skb, **frag;
3081 struct l2cap_cmd_hdr *cmd;
3082 struct l2cap_hdr *lh;
3083 int len, count;
3084
b4400672
AE		 3085 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
3086 conn, code, ident, dlen);
1da177e4 3087
300b962e
AL		 3088 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
3089 return NULL;
3090
1da177e4
LT		 3091 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
3092 count = min_t(unsigned int, conn->mtu, len);
3093
8bcde1f2 3094 skb = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 3095 if (!skb)
3096 return NULL;
3097
3098 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 3099 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 3100
3101 if (conn->hcon->type == LE_LINK)
ac73498c 3102 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
3300d9a9 3103 else
ac73498c 3104 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 3105
3106 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
3107 cmd->code = code;
3108 cmd->ident = ident;
aca3192c 3109 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 3110
3111 if (dlen) {
3112 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
3113 memcpy(skb_put(skb, count), data, count);
3114 data += count;
3115 }
3116
3117 len -= skb->len;
3118
3119 /* Continuation fragments (no L2CAP header) */
3120 frag = &skb_shinfo(skb)->frag_list;
3121 while (len) {
3122 count = min_t(unsigned int, conn->mtu, len);
3123
8bcde1f2 3124 *frag = bt_skb_alloc(count, GFP_KERNEL);
1da177e4
LT		 3125 if (!*frag)
3126 goto fail;
3127
3128 memcpy(skb_put(*frag, count), data, count);
3129
3130 len -= count;
3131 data += count;
3132
3133 frag = &(*frag)->next;
3134 }
3135
3136 return skb;
3137
3138fail:
3139 kfree_skb(skb);
3140 return NULL;
3141}
3142
2d792818
GP		 3143static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
3144 unsigned long *val)
1da177e4
LT		 3145{
3146 struct l2cap_conf_opt *opt = *ptr;
3147 int len;
3148
3149 len = L2CAP_CONF_OPT_SIZE + opt->len;
3150 *ptr += len;
3151
3152 *type = opt->type;
3153 *olen = opt->len;
3154
3155 switch (opt->len) {
3156 case 1:
3157 *val = *((u8 *) opt->val);
3158 break;
3159
3160 case 2:
bfaaeb3e 3161 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 3162 break;
3163
3164 case 4:
bfaaeb3e 3165 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 3166 break;
3167
3168 default:
3169 *val = (unsigned long) opt->val;
3170 break;
3171 }
3172
b4400672 3173 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
1da177e4
LT		 3174 return len;
3175}
3176
1da177e4
LT		 3177static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
3178{
3179 struct l2cap_conf_opt *opt = *ptr;
3180
b4400672 3181 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
1da177e4
LT		 3182
3183 opt->type = type;
3184 opt->len = len;
3185
3186 switch (len) {
3187 case 1:
3188 *((u8 *) opt->val) = val;
3189 break;
3190
3191 case 2:
4f8b691c 3192 put_unaligned_le16(val, opt->val);
1da177e4
LT		 3193 break;
3194
3195 case 4:
4f8b691c 3196 put_unaligned_le32(val, opt->val);
1da177e4
LT		 3197 break;
3198
3199 default:
3200 memcpy(opt->val, (void *) val, len);
3201 break;
3202 }
3203
3204 *ptr += L2CAP_CONF_OPT_SIZE + len;
3205}
3206
f89cef09
AE		 3207static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
3208{
3209 struct l2cap_conf_efs efs;
3210
1ec918ce 3211 switch (chan->mode) {
f89cef09
AE		 3212 case L2CAP_MODE_ERTM:
3213 efs.id = chan->local_id;
3214 efs.stype = chan->local_stype;
3215 efs.msdu = cpu_to_le16(chan->local_msdu);
3216 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
ac73498c 3217 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
8936fa6d 3218 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
f89cef09
AE		 3219 break;
3220
3221 case L2CAP_MODE_STREAMING:
3222 efs.id = 1;
3223 efs.stype = L2CAP_SERV_BESTEFFORT;
3224 efs.msdu = cpu_to_le16(chan->local_msdu);
3225 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
3226 efs.acc_lat = 0;
3227 efs.flush_to = 0;
3228 break;
3229
3230 default:
3231 return;
3232 }
3233
3234 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
8936fa6d 3235 (unsigned long) &efs);
f89cef09
AE		 3236}
3237
721c4181 3238static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 3239{
721c4181 3240 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
0362520b
MM		 3241 ack_timer.work);
3242 u16 frames_to_ack;
c1b4f43b 3243
2fb9b3d4
GP		 3244 BT_DBG("chan %p", chan);
3245
6be36555
AE		 3246 l2cap_chan_lock(chan);
3247
0362520b
MM		 3248 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3249 chan->last_acked_seq);
6be36555 3250
0362520b
MM		 3251 if (frames_to_ack)
3252 l2cap_send_rr_or_rnr(chan, 0);
09bfb2ee 3253
0362520b 3254 l2cap_chan_unlock(chan);
09bfb2ee 3255 l2cap_chan_put(chan);
c1b4f43b
GP		 3256}
3257
466f8004 3258int l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 3259{
3c588192
MM		 3260 int err;
3261
105bdf9e
MM		 3262 chan->next_tx_seq = 0;
3263 chan->expected_tx_seq = 0;
42e5c802 3264 chan->expected_ack_seq = 0;
6a026610 3265 chan->unacked_frames = 0;
42e5c802 3266 chan->buffer_seq = 0;
6a026610 3267 chan->frames_sent = 0;
105bdf9e
MM		 3268 chan->last_acked_seq = 0;
3269 chan->sdu = NULL;
3270 chan->sdu_last_frag = NULL;
3271 chan->sdu_len = 0;
3272
d34c34fb
MM		 3273 skb_queue_head_init(&chan->tx_q);
3274
6ed971ca
MH		 3275 chan->local_amp_id = AMP_ID_BREDR;
3276 chan->move_id = AMP_ID_BREDR;
08333283
MM		 3277 chan->move_state = L2CAP_MOVE_STABLE;
3278 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3279
105bdf9e
MM		 3280 if (chan->mode != L2CAP_MODE_ERTM)
3281 return 0;
3282
3283 chan->rx_state = L2CAP_RX_STATE_RECV;
3284 chan->tx_state = L2CAP_TX_STATE_XMIT;
0565c1c2 3285
721c4181
GP		 3286 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3287 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3288 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 3289
f1c6775b 3290 skb_queue_head_init(&chan->srej_q);
1890d36b 3291
3c588192
MM		 3292 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3293 if (err < 0)
3294 return err;
3295
9dc9affc
MM		 3296 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3297 if (err < 0)
3298 l2cap_seq_list_free(&chan->srej_list);
3299
3300 return err;
0565c1c2
GP		 3301}
3302
f2fcfcd6
GP		 3303static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3304{
3305 switch (mode) {
3306 case L2CAP_MODE_STREAMING:
3307 case L2CAP_MODE_ERTM:
3308 if (l2cap_mode_supported(mode, remote_feat_mask))
3309 return mode;
3310 /* fall through */
3311 default:
3312 return L2CAP_MODE_BASIC;
3313 }
3314}
3315
848566b3 3316static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
6327eb98 3317{
848566b3 3318 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
6327eb98
AE		 3319}
3320
848566b3 3321static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
f89cef09 3322{
848566b3 3323 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
f89cef09
AE		 3324}
3325
36c86c85
MM		 3326static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3327 struct l2cap_conf_rfc *rfc)
3328{
6ed971ca 3329 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
36c86c85
MM		 3330 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3331
3332 /* Class 1 devices have must have ERTM timeouts
3333 * exceeding the Link Supervision Timeout. The
3334 * default Link Supervision Timeout for AMP
3335 * controllers is 10 seconds.
3336 *
3337 * Class 1 devices use 0xffffffff for their
3338 * best-effort flush timeout, so the clamping logic
3339 * will result in a timeout that meets the above
3340 * requirement. ERTM timeouts are 16-bit values, so
3341 * the maximum timeout is 65.535 seconds.
3342 */
3343
3344 /* Convert timeout to milliseconds and round */
3345 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3346
3347 /* This is the recommended formula for class 2 devices
3348 * that start ERTM timers when packets are sent to the
3349 * controller.
3350 */
3351 ertm_to = 3 * ertm_to + 500;
3352
3353 if (ertm_to > 0xffff)
3354 ertm_to = 0xffff;
3355
3356 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3357 rfc->monitor_timeout = rfc->retrans_timeout;
3358 } else {
3359 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3360 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3361 }
3362}
3363
6327eb98
AE		 3364static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3365{
3366 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
848566b3 3367 __l2cap_ews_supported(chan->conn)) {
6327eb98
AE		 3368 /* use extended control field */
3369 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 3370 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3371 } else {
6327eb98 3372 chan->tx_win = min_t(u16, chan->tx_win,
2d792818 3373 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 3374 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3375 }
c20f8e35 3376 chan->ack_win = chan->tx_win;
6327eb98
AE		 3377}
3378
710f9b0a 3379static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3380{
1da177e4 3381 struct l2cap_conf_req *req = data;
0c1bc5c6 3382 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 3383 void *ptr = req->data;
c8f79162 3384 u16 size;
1da177e4 3385
49208c9c 3386 BT_DBG("chan %p", chan);
1da177e4 3387
73ffa904 3388 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 3389 goto done;
3390
0c1bc5c6 3391 switch (chan->mode) {
f2fcfcd6
GP		 3392 case L2CAP_MODE_STREAMING:
3393 case L2CAP_MODE_ERTM:
c1360a1c 3394 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 3395 break;
85eb53c6 3396
848566b3 3397 if (__l2cap_efs_supported(chan->conn))
f89cef09
AE		 3398 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3399
2ba13ed6 3400 /* fall through */
f2fcfcd6 3401 default:
8c1d787b 3402 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 3403 break;
3404 }
3405
3406done:
0c1bc5c6
GP		 3407 if (chan->imtu != L2CAP_DEFAULT_MTU)
3408 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 3409
0c1bc5c6 3410 switch (chan->mode) {
65c7c491 3411 case L2CAP_MODE_BASIC:
8c1d787b 3412 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2d792818 3413 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 3414 break;
3415
62547752
GP		 3416 rfc.mode = L2CAP_MODE_BASIC;
3417 rfc.txwin_size = 0;
3418 rfc.max_transmit = 0;
3419 rfc.retrans_timeout = 0;
3420 rfc.monitor_timeout = 0;
3421 rfc.max_pdu_size = 0;
3422
63406504 3423 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3424 (unsigned long) &rfc);
65c7c491
MH		 3425 break;
3426
3427 case L2CAP_MODE_ERTM:
3428 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 3429 rfc.max_transmit = chan->max_tx;
36c86c85
MM		 3430
3431 __l2cap_set_ertm_timeouts(chan, &rfc);
c8f79162
AE		 3432
3433 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3434 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3435 L2CAP_FCS_SIZE);
c8f79162 3436 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 3437
6327eb98
AE		 3438 l2cap_txwin_setup(chan);
3439
3440 rfc.txwin_size = min_t(u16, chan->tx_win,
2d792818 3441 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 3442
63406504 3443 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3444 (unsigned long) &rfc);
63406504 3445
f89cef09
AE		 3446 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3447 l2cap_add_opt_efs(&ptr, chan);
3448
6327eb98
AE		 3449 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3450 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2d792818 3451 chan->tx_win);
60918918
AE		 3452
3453 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3454 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3455 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3456 chan->fcs = L2CAP_FCS_NONE;
3457 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3458 chan->fcs);
3459 }
f2fcfcd6
GP		 3460 break;
3461
3462 case L2CAP_MODE_STREAMING:
273759e2 3463 l2cap_txwin_setup(chan);
f2fcfcd6
GP		 3464 rfc.mode = L2CAP_MODE_STREAMING;
3465 rfc.txwin_size = 0;
3466 rfc.max_transmit = 0;
3467 rfc.retrans_timeout = 0;
3468 rfc.monitor_timeout = 0;
c8f79162
AE		 3469
3470 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2d792818
GP		 3471 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3472 L2CAP_FCS_SIZE);
c8f79162 3473 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 3474
63406504 3475 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2d792818 3476 (unsigned long) &rfc);
63406504 3477
f89cef09
AE		 3478 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3479 l2cap_add_opt_efs(&ptr, chan);
3480
60918918
AE		 3481 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3482 if (chan->fcs == L2CAP_FCS_NONE ||
f2592d3e 3483 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
60918918
AE		 3484 chan->fcs = L2CAP_FCS_NONE;
3485 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3486 chan->fcs);
3487 }
65c7c491
MH		 3488 break;
3489 }
1da177e4 3490
fe4128e0 3491 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3492 req->flags = __constant_cpu_to_le16(0);
1da177e4
LT		 3493
3494 return ptr - data;
3495}
3496
73ffa904 3497static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 3498{
5dee9e7c
MH		 3499 struct l2cap_conf_rsp *rsp = data;
3500 void *ptr = rsp->data;
73ffa904
GP		 3501 void *req = chan->conf_req;
3502 int len = chan->conf_len;
5dee9e7c
MH		 3503 int type, hint, olen;
3504 unsigned long val;
6464f35f 3505 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 3506 struct l2cap_conf_efs efs;
3507 u8 remote_efs = 0;
861d6882 3508 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 3509 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 3510 u16 size;
1da177e4 3511
73ffa904 3512 BT_DBG("chan %p", chan);
820ae1b8 3513
5dee9e7c
MH		 3514 while (len >= L2CAP_CONF_OPT_SIZE) {
3515 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 3516
589d2746 3517 hint = type & L2CAP_CONF_HINT;
47ec1dcd 3518 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 3519
3520 switch (type) {
3521 case L2CAP_CONF_MTU:
861d6882 3522 mtu = val;
5dee9e7c
MH		 3523 break;
3524
3525 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3526 chan->flush_to = val;
5dee9e7c
MH		 3527 break;
3528
3529 case L2CAP_CONF_QOS:
3530 break;
3531
6464f35f
MH		 3532 case L2CAP_CONF_RFC:
3533 if (olen == sizeof(rfc))
3534 memcpy(&rfc, (void *) val, olen);
3535 break;
3536
fcc203c3
GP		 3537 case L2CAP_CONF_FCS:
3538 if (val == L2CAP_FCS_NONE)
f2592d3e 3539 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
42dceae2 3540 break;
fcc203c3 3541
42dceae2
AE		 3542 case L2CAP_CONF_EFS:
3543 remote_efs = 1;
3544 if (olen == sizeof(efs))
3545 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 3546 break;
3547
6327eb98 3548 case L2CAP_CONF_EWS:
848566b3 3549 if (!chan->conn->hs_enabled)
6327eb98 3550 return -ECONNREFUSED;
fcc203c3 3551
6327eb98
AE		 3552 set_bit(FLAG_EXT_CTRL, &chan->flags);
3553 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 3554 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 3555 chan->remote_tx_win = val;
fcc203c3
GP		 3556 break;
3557
5dee9e7c
MH		 3558 default:
3559 if (hint)
3560 break;
3561
3562 result = L2CAP_CONF_UNKNOWN;
3563 *((u8 *) ptr++) = type;
3564 break;
3565 }
3566 }
3567
73ffa904 3568 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 3569 goto done;
3570
0c1bc5c6 3571 switch (chan->mode) {
f2fcfcd6
GP		 3572 case L2CAP_MODE_STREAMING:
3573 case L2CAP_MODE_ERTM:
c1360a1c 3574 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 3575 chan->mode = l2cap_select_mode(rfc.mode,
2d792818 3576 chan->conn->feat_mask);
85eb53c6
GP		 3577 break;
3578 }
3579
42dceae2 3580 if (remote_efs) {
848566b3 3581 if (__l2cap_efs_supported(chan->conn))
42dceae2
AE		 3582 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3583 else
3584 return -ECONNREFUSED;
3585 }
3586
0c1bc5c6 3587 if (chan->mode != rfc.mode)
f2fcfcd6 3588 return -ECONNREFUSED;
742e519b 3589
f2fcfcd6 3590 break;
f2fcfcd6
GP		 3591 }
3592
3593done:
0c1bc5c6 3594 if (chan->mode != rfc.mode) {
f2fcfcd6 3595 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3596 rfc.mode = chan->mode;
f2fcfcd6 3597
73ffa904 3598 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 3599 return -ECONNREFUSED;
3600
2d792818
GP		 3601 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3602 (unsigned long) &rfc);
f2fcfcd6
GP		 3603 }
3604
5dee9e7c
MH		 3605 if (result == L2CAP_CONF_SUCCESS) {
3606 /* Configure output options and let the other side know
3607 * which ones we don't like. */
3608
f2fcfcd6
GP		 3609 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3610 result = L2CAP_CONF_UNACCEPT;
3611 else {
0c1bc5c6 3612 chan->omtu = mtu;
c1360a1c 3613 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 3614 }
0c1bc5c6 3615 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 3616
42dceae2
AE		 3617 if (remote_efs) {
3618 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3619 efs.stype != L2CAP_SERV_NOTRAFIC &&
3620 efs.stype != chan->local_stype) {
42dceae2
AE		 3621
3622 result = L2CAP_CONF_UNACCEPT;
3623
3624 if (chan->num_conf_req >= 1)
3625 return -ECONNREFUSED;
3626
3627 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3628 sizeof(efs),
3629 (unsigned long) &efs);
0e8b207e 3630 } else {
3e6b3b95 3631 /* Send PENDING Conf Rsp */
0e8b207e
AE		 3632 result = L2CAP_CONF_PENDING;
3633 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 3634 }
3635 }
3636
f2fcfcd6
GP		 3637 switch (rfc.mode) {
3638 case L2CAP_MODE_BASIC:
47d1ec61 3639 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 3640 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 3641 break;
3642
3643 case L2CAP_MODE_ERTM:
6327eb98
AE		 3644 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3645 chan->remote_tx_win = rfc.txwin_size;
3646 else
3647 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 3648
2c03a7a4 3649 chan->remote_max_tx = rfc.max_transmit;
1c762159 3650
c8f79162 3651 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3652 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3653 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3654 rfc.max_pdu_size = cpu_to_le16(size);
3655 chan->remote_mps = size;
f2fcfcd6 3656
36c86c85 3657 __l2cap_set_ertm_timeouts(chan, &rfc);
f2fcfcd6 3658
c1360a1c 3659 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 3660
3661 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3662 sizeof(rfc), (unsigned long) &rfc);
68ae6639 3663
42dceae2
AE		 3664 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3665 chan->remote_id = efs.id;
3666 chan->remote_stype = efs.stype;
3667 chan->remote_msdu = le16_to_cpu(efs.msdu);
3668 chan->remote_flush_to =
2d792818 3669 le32_to_cpu(efs.flush_to);
42dceae2 3670 chan->remote_acc_lat =
2d792818 3671 le32_to_cpu(efs.acc_lat);
42dceae2
AE		 3672 chan->remote_sdu_itime =
3673 le32_to_cpu(efs.sdu_itime);
3674 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2d792818
GP		 3675 sizeof(efs),
3676 (unsigned long) &efs);
42dceae2 3677 }
f2fcfcd6
GP		 3678 break;
3679
3680 case L2CAP_MODE_STREAMING:
c8f79162 3681 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2d792818
GP		 3682 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3683 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
c8f79162
AE		 3684 rfc.max_pdu_size = cpu_to_le16(size);
3685 chan->remote_mps = size;
f2fcfcd6 3686
c1360a1c 3687 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639 3688
2d792818
GP		 3689 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3690 (unsigned long) &rfc);
68ae6639 3691
f2fcfcd6
GP		 3692 break;
3693
3694 default:
5dee9e7c 3695 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 3696
6464f35f 3697 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 3698 rfc.mode = chan->mode;
f2fcfcd6 3699 }
6464f35f 3700
f2fcfcd6 3701 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 3702 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 3703 }
fe4128e0 3704 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3705 rsp->result = cpu_to_le16(result);
59e54bd1 3706 rsp->flags = __constant_cpu_to_le16(0);
5dee9e7c
MH		 3707
3708 return ptr - data;
1da177e4
LT		 3709}
3710
2d792818
GP		 3711static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3712 void *data, u16 *result)
f2fcfcd6 3713{
f2fcfcd6
GP		 3714 struct l2cap_conf_req *req = data;
3715 void *ptr = req->data;
3716 int type, olen;
3717 unsigned long val;
36e999a8 3718 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 3719 struct l2cap_conf_efs efs;
f2fcfcd6 3720
fe4128e0 3721 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 3722
3723 while (len >= L2CAP_CONF_OPT_SIZE) {
3724 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3725
3726 switch (type) {
3727 case L2CAP_CONF_MTU:
3728 if (val < L2CAP_DEFAULT_MIN_MTU) {
3729 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 3730 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 3731 } else
0c1bc5c6
GP		 3732 chan->imtu = val;
3733 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 3734 break;
3735
3736 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 3737 chan->flush_to = val;
f2fcfcd6 3738 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2d792818 3739 2, chan->flush_to);
f2fcfcd6
GP		 3740 break;
3741
3742 case L2CAP_CONF_RFC:
3743 if (olen == sizeof(rfc))
3744 memcpy(&rfc, (void *)val, olen);
3745
c1360a1c 3746 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
2d792818 3747 rfc.mode != chan->mode)
f2fcfcd6
GP		 3748 return -ECONNREFUSED;
3749
47d1ec61 3750 chan->fcs = 0;
f2fcfcd6
GP		 3751
3752 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2d792818 3753 sizeof(rfc), (unsigned long) &rfc);
f2fcfcd6 3754 break;
6327eb98
AE		 3755
3756 case L2CAP_CONF_EWS:
c20f8e35 3757 chan->ack_win = min_t(u16, val, chan->ack_win);
3e6b3b95 3758 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
c20f8e35 3759 chan->tx_win);
6327eb98 3760 break;
66af7aaf
AE		 3761
3762 case L2CAP_CONF_EFS:
3763 if (olen == sizeof(efs))
3764 memcpy(&efs, (void *)val, olen);
3765
3766 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2d792818
GP		 3767 efs.stype != L2CAP_SERV_NOTRAFIC &&
3768 efs.stype != chan->local_stype)
66af7aaf
AE		 3769 return -ECONNREFUSED;
3770
2d792818
GP		 3771 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3772 (unsigned long) &efs);
66af7aaf 3773 break;
cbabee78
AE		 3774
3775 case L2CAP_CONF_FCS:
3776 if (*result == L2CAP_CONF_PENDING)
3777 if (val == L2CAP_FCS_NONE)
f2592d3e 3778 set_bit(CONF_RECV_NO_FCS,
cbabee78
AE		 3779 &chan->conf_state);
3780 break;
f2fcfcd6
GP		 3781 }
3782 }
3783
0c1bc5c6 3784 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 3785 return -ECONNREFUSED;
3786
0c1bc5c6 3787 chan->mode = rfc.mode;
6c2ea7a8 3788
0e8b207e 3789 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 3790 switch (rfc.mode) {
3791 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3792 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3793 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3794 chan->mps = le16_to_cpu(rfc.max_pdu_size);
c20f8e35
MM		 3795 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3796 chan->ack_win = min_t(u16, chan->ack_win,
3797 rfc.txwin_size);
66af7aaf
AE		 3798
3799 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3800 chan->local_msdu = le16_to_cpu(efs.msdu);
3801 chan->local_sdu_itime =
2d792818 3802 le32_to_cpu(efs.sdu_itime);
66af7aaf
AE		 3803 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3804 chan->local_flush_to =
2d792818 3805 le32_to_cpu(efs.flush_to);
66af7aaf 3806 }
f2fcfcd6 3807 break;
66af7aaf 3808
f2fcfcd6 3809 case L2CAP_MODE_STREAMING:
47d1ec61 3810 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 3811 }
3812 }
3813
fe4128e0 3814 req->dcid = cpu_to_le16(chan->dcid);
59e54bd1 3815 req->flags = __constant_cpu_to_le16(0);
f2fcfcd6
GP		 3816
3817 return ptr - data;
3818}
3819
2d792818
GP		 3820static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3821 u16 result, u16 flags)
1da177e4
LT		 3822{
3823 struct l2cap_conf_rsp *rsp = data;
3824 void *ptr = rsp->data;
1da177e4 3825
fe4128e0 3826 BT_DBG("chan %p", chan);
1da177e4 3827
fe4128e0 3828 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 3829 rsp->result = cpu_to_le16(result);
aca3192c 3830 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 3831
3832 return ptr - data;
3833}
3834
27e2d4c8
JH		 3835void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3836{
3837 struct l2cap_le_conn_rsp rsp;
3838 struct l2cap_conn *conn = chan->conn;
3839
3840 BT_DBG("chan %p", chan);
3841
3842 rsp.dcid = cpu_to_le16(chan->scid);
3843 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 3844 rsp.mps = cpu_to_le16(chan->mps);
0cd75f7e 3845 rsp.credits = cpu_to_le16(chan->rx_credits);
27e2d4c8
JH		 3846 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3847
3848 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3849 &rsp);
3850}
3851
8c1d787b 3852void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 3853{
3854 struct l2cap_conn_rsp rsp;
8c1d787b 3855 struct l2cap_conn *conn = chan->conn;
710f9b0a 3856 u8 buf[128];
439f34ac 3857 u8 rsp_code;
710f9b0a 3858
fe4128e0
GP		 3859 rsp.scid = cpu_to_le16(chan->dcid);
3860 rsp.dcid = cpu_to_le16(chan->scid);
ac73498c
AE		 3861 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3862 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
439f34ac
AE		 3863
3864 if (chan->hs_hcon)
3865 rsp_code = L2CAP_CREATE_CHAN_RSP;
3866 else
3867 rsp_code = L2CAP_CONN_RSP;
3868
3869 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3870
3871 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
710f9b0a 3872
c1360a1c 3873 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 3874 return;
3875
710f9b0a 3876 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 3877 l2cap_build_conf_req(chan, buf), buf);
710f9b0a
GP		 3878 chan->num_conf_req++;
3879}
3880
47d1ec61 3881static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 3882{
7b1c0049
GP		 3883 int type, olen;
3884 unsigned long val;
c20f8e35
MM		 3885 /* Use sane default values in case a misbehaving remote device
3886 * did not send an RFC or extended window size option.
3887 */
3888 u16 txwin_ext = chan->ack_win;
3889 struct l2cap_conf_rfc rfc = {
3890 .mode = chan->mode,
3891 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3892 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3893 .max_pdu_size = cpu_to_le16(chan->imtu),
3894 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3895 };
7b1c0049 3896
47d1ec61 3897 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 3898
0c1bc5c6 3899 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 3900 return;
3901
3902 while (len >= L2CAP_CONF_OPT_SIZE) {
3903 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3904
c20f8e35
MM		 3905 switch (type) {
3906 case L2CAP_CONF_RFC:
3907 if (olen == sizeof(rfc))
3908 memcpy(&rfc, (void *)val, olen);
8f321f85 3909 break;
c20f8e35
MM		 3910 case L2CAP_CONF_EWS:
3911 txwin_ext = val;
3912 break;
3913 }
7b1c0049
GP		 3914 }
3915
7b1c0049
GP		 3916 switch (rfc.mode) {
3917 case L2CAP_MODE_ERTM:
47d1ec61
GP		 3918 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3919 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
c20f8e35
MM		 3920 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3921 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3922 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3923 else
3924 chan->ack_win = min_t(u16, chan->ack_win,
3925 rfc.txwin_size);
7b1c0049
GP		 3926 break;
3927 case L2CAP_MODE_STREAMING:
47d1ec61 3928 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 3929 }
3930}
3931
2d792818 3932static inline int l2cap_command_rej(struct l2cap_conn *conn,
cb3b3152
JH		 3933 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3934 u8 *data)
4e8402a3 3935{
e2fd318e 3936 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 3937
cb3b3152
JH		 3938 if (cmd_len < sizeof(*rej))
3939 return -EPROTO;
3940
e2fd318e 3941 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 3942 return 0;
3943
3944 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2d792818 3945 cmd->ident == conn->info_ident) {
17cd3f37 3946 cancel_delayed_work(&conn->info_timer);
984947dc
MH		 3947
3948 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3949 conn->info_ident = 0;
984947dc 3950
4e8402a3
MH		 3951 l2cap_conn_start(conn);
3952 }
3953
3954 return 0;
3955}
3956
1700915f
MM		 3957static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3958 struct l2cap_cmd_hdr *cmd,
3959 u8 *data, u8 rsp_code, u8 amp_id)
1da177e4 3960{
1da177e4
LT		 3961 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3962 struct l2cap_conn_rsp rsp;
23691d75 3963 struct l2cap_chan *chan = NULL, *pchan;
e7c29cb1 3964 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 3965
3966 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 3967 __le16 psm = req->psm;
1da177e4 3968
097db76c 3969 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
1da177e4
LT		 3970
3971 /* Check if we have socket listening on psm */
6f59b904 3972 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
bf20fd4e 3973 &conn->hcon->dst, ACL_LINK);
23691d75 3974 if (!pchan) {
1da177e4
LT		 3975 result = L2CAP_CR_BAD_PSM;
3976 goto sendresp;
3977 }
3978
3df91ea2 3979 mutex_lock(&conn->chan_lock);
8ffb9290 3980 l2cap_chan_lock(pchan);
e0f0cb56 3981
e7c29cb1 3982 /* Check if the ACL is secure enough (if not SDP) */
2983fd68 3983 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
2d792818 3984 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 3985 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 3986 result = L2CAP_CR_SEC_BLOCK;
3987 goto response;
3988 }
3989
1da177e4
LT		 3990 result = L2CAP_CR_NO_MEM;
3991
2dfa1003
GP		 3992 /* Check if we already have channel with that dcid */
3993 if (__l2cap_get_chan_by_dcid(conn, scid))
3994 goto response;
3995
80b98027 3996 chan = pchan->ops->new_connection(pchan);
80808e43 3997 if (!chan)
1da177e4
LT		 3998 goto response;
3999
330b6c15
SS		 4000 /* For certain devices (ex: HID mouse), support for authentication,
4001 * pairing and bonding is optional. For such devices, inorder to avoid
4002 * the ACL alive for too long after L2CAP disconnection, reset the ACL
4003 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
4004 */
4005 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
4006
7eafc59e
MH		 4007 bacpy(&chan->src, &conn->hcon->src);
4008 bacpy(&chan->dst, &conn->hcon->dst);
4f1654e0
MH		 4009 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
4010 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
fe4128e0
GP		 4011 chan->psm = psm;
4012 chan->dcid = scid;
1700915f 4013 chan->local_amp_id = amp_id;
1da177e4 4014
6be36555 4015 __l2cap_chan_add(conn, chan);
48454079 4016
fe4128e0 4017 dcid = chan->scid;
1da177e4 4018
8d836d71 4019 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1da177e4 4020
fc7f8a7e 4021 chan->ident = cmd->ident;
1da177e4 4022
984947dc 4023 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 4024 if (l2cap_chan_check_security(chan)) {
bdc25783 4025 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
f93fa273 4026 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 4027 result = L2CAP_CR_PEND;
4028 status = L2CAP_CS_AUTHOR_PEND;
2dc4e510 4029 chan->ops->defer(chan);
f66dc81f 4030 } else {
1700915f
MM		 4031 /* Force pending result for AMP controllers.
4032 * The connection will succeed after the
4033 * physical link is up.
4034 */
6ed971ca 4035 if (amp_id == AMP_ID_BREDR) {
f93fa273 4036 l2cap_state_change(chan, BT_CONFIG);
1700915f 4037 result = L2CAP_CR_SUCCESS;
6ed971ca 4038 } else {
f93fa273 4039 l2cap_state_change(chan, BT_CONNECT2);
6ed971ca 4040 result = L2CAP_CR_PEND;
1700915f 4041 }
f66dc81f
MH		 4042 status = L2CAP_CS_NO_INFO;
4043 }
79d554a6 4044 } else {
f93fa273 4045 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 4046 result = L2CAP_CR_PEND;
4047 status = L2CAP_CS_AUTHEN_PEND;
4048 }
4049 } else {
f93fa273 4050 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 4051 result = L2CAP_CR_PEND;
4052 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 4053 }
4054
1da177e4 4055response:
8ffb9290 4056 l2cap_chan_unlock(pchan);
3df91ea2 4057 mutex_unlock(&conn->chan_lock);
1da177e4
LT		 4058
4059sendresp:
aca3192c
YH		 4060 rsp.scid = cpu_to_le16(scid);
4061 rsp.dcid = cpu_to_le16(dcid);
4062 rsp.result = cpu_to_le16(result);
4063 rsp.status = cpu_to_le16(status);
4c89b6aa 4064 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
79d554a6
MH		 4065
4066 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
4067 struct l2cap_info_req info;
ac73498c 4068 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
79d554a6
MH		 4069
4070 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
4071 conn->info_ident = l2cap_get_ident(conn);
4072
ba13ccd9 4073 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
79d554a6 4074
2d792818
GP		 4075 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
4076 sizeof(info), &info);
79d554a6
MH		 4077 }
4078
c1360a1c 4079 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
2d792818 4080 result == L2CAP_CR_SUCCESS) {
e9aeb2dd 4081 u8 buf[128];
c1360a1c 4082 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 4083 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4084 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4085 chan->num_conf_req++;
e9aeb2dd 4086 }
1700915f
MM		 4087
4088 return chan;
4c89b6aa 4089}
e9aeb2dd 4090
4c89b6aa 4091static int l2cap_connect_req(struct l2cap_conn *conn,
cb3b3152 4092 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
4c89b6aa 4093{
7b064eda
JK		 4094 struct hci_dev *hdev = conn->hcon->hdev;
4095 struct hci_conn *hcon = conn->hcon;
4096
cb3b3152
JH		 4097 if (cmd_len < sizeof(struct l2cap_conn_req))
4098 return -EPROTO;
4099
7b064eda
JK		 4100 hci_dev_lock(hdev);
4101 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
4102 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
4103 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
4104 hcon->dst_type, 0, NULL, 0,
4105 hcon->dev_class);
4106 hci_dev_unlock(hdev);
4107
300229f9 4108 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
1da177e4
LT		 4109 return 0;
4110}
4111
5909cf30 4112static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4113 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4114 u8 *data)
1da177e4
LT		 4115{
4116 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
4117 u16 scid, dcid, result, status;
48454079 4118 struct l2cap_chan *chan;
1da177e4 4119 u8 req[128];
3df91ea2 4120 int err;
1da177e4 4121
cb3b3152
JH		 4122 if (cmd_len < sizeof(*rsp))
4123 return -EPROTO;
4124
1da177e4
LT		 4125 scid = __le16_to_cpu(rsp->scid);
4126 dcid = __le16_to_cpu(rsp->dcid);
4127 result = __le16_to_cpu(rsp->result);
4128 status = __le16_to_cpu(rsp->status);
4129
1b009c98 4130 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
2d792818 4131 dcid, scid, result, status);
1da177e4 4132
3df91ea2
AE		 4133 mutex_lock(&conn->chan_lock);
4134
1da177e4 4135 if (scid) {
3df91ea2
AE		 4136 chan = __l2cap_get_chan_by_scid(conn, scid);
4137 if (!chan) {
21870b52 4138 err = -EBADSLT;
3df91ea2
AE		 4139 goto unlock;
4140 }
1da177e4 4141 } else {
3df91ea2
AE		 4142 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
4143 if (!chan) {
21870b52 4144 err = -EBADSLT;
3df91ea2
AE		 4145 goto unlock;
4146 }
1da177e4
LT		 4147 }
4148
3df91ea2
AE		 4149 err = 0;
4150
6be36555 4151 l2cap_chan_lock(chan);
48454079 4152
1da177e4
LT		 4153 switch (result) {
4154 case L2CAP_CR_SUCCESS:
89bc500e 4155 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 4156 chan->ident = 0;
fe4128e0 4157 chan->dcid = dcid;
c1360a1c 4158 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 4159
c1360a1c 4160 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 4161 break;
4162
1da177e4 4163 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4164 l2cap_build_conf_req(chan, req), req);
73ffa904 4165 chan->num_conf_req++;
1da177e4
LT		 4166 break;
4167
4168 case L2CAP_CR_PEND:
c1360a1c 4169 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 4170 break;
4171
4172 default:
48454079 4173 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 4174 break;
4175 }
4176
6be36555 4177 l2cap_chan_unlock(chan);
3df91ea2
AE		 4178
4179unlock:
4180 mutex_unlock(&conn->chan_lock);
4181
4182 return err;
1da177e4
LT		 4183}
4184
47d1ec61 4185static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 4186{
4187 /* FCS is enabled only in ERTM or streaming mode, if one or both
4188 * sides request it.
4189 */
0c1bc5c6 4190 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 4191 chan->fcs = L2CAP_FCS_NONE;
f2592d3e 4192 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
47d1ec61 4193 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 4194}
4195
29d8a590
AE		 4196static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
4197 u8 ident, u16 flags)
4198{
4199 struct l2cap_conn *conn = chan->conn;
4200
4201 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
4202 flags);
4203
4204 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
4205 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
4206
4207 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
4208 l2cap_build_conf_rsp(chan, data,
4209 L2CAP_CONF_SUCCESS, flags), data);
4210}
4211
662d652d
JH		 4212static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
4213 u16 scid, u16 dcid)
4214{
4215 struct l2cap_cmd_rej_cid rej;
4216
4217 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
4218 rej.scid = __cpu_to_le16(scid);
4219 rej.dcid = __cpu_to_le16(dcid);
4220
4221 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
4222}
4223
2d792818
GP		 4224static inline int l2cap_config_req(struct l2cap_conn *conn,
4225 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4226 u8 *data)
1da177e4
LT		 4227{
4228 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4229 u16 dcid, flags;
4230 u8 rsp[64];
48454079 4231 struct l2cap_chan *chan;
3c588192 4232 int len, err = 0;
1da177e4 4233
cb3b3152
JH		 4234 if (cmd_len < sizeof(*req))
4235 return -EPROTO;
4236
1da177e4
LT		 4237 dcid = __le16_to_cpu(req->dcid);
4238 flags = __le16_to_cpu(req->flags);
4239
4240 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4241
baa7e1fa 4242 chan = l2cap_get_chan_by_scid(conn, dcid);
662d652d
JH		 4243 if (!chan) {
4244 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4245 return 0;
4246 }
1da177e4 4247
033b1142 4248 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
662d652d
JH		 4249 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4250 chan->dcid);
354f60a9 4251 goto unlock;
df6bd743 4252 }
354f60a9 4253
5dee9e7c 4254 /* Reject if config buffer is too small. */
88219a0f 4255 len = cmd_len - sizeof(*req);
cb3b3152 4256 if (chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 4257 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4258 l2cap_build_conf_rsp(chan, rsp,
4259 L2CAP_CONF_REJECT, flags), rsp);
5dee9e7c
MH		 4260 goto unlock;
4261 }
4262
4263 /* Store config. */
73ffa904
GP		 4264 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4265 chan->conf_len += len;
1da177e4 4266
59e54bd1 4267 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
1da177e4
LT		 4268 /* Incomplete config. Send empty response. */
4269 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2d792818
GP		 4270 l2cap_build_conf_rsp(chan, rsp,
4271 L2CAP_CONF_SUCCESS, flags), rsp);
1da177e4
LT		 4272 goto unlock;
4273 }
4274
4275 /* Complete config. */
73ffa904 4276 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 4277 if (len < 0) {
5e4e3972 4278 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4 4279 goto unlock;
f2fcfcd6 4280 }
1da177e4 4281
1500109b 4282 chan->ident = cmd->ident;
5dee9e7c 4283 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 4284 chan->num_conf_rsp++;
5dee9e7c 4285
5dee9e7c 4286 /* Reset config buffer. */
73ffa904 4287 chan->conf_len = 0;
5dee9e7c 4288
c1360a1c 4289 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 4290 goto unlock;
4291
c1360a1c 4292 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 4293 set_default_fcs(chan);
fcc203c3 4294
105bdf9e
MM		 4295 if (chan->mode == L2CAP_MODE_ERTM ||
4296 chan->mode == L2CAP_MODE_STREAMING)
3c588192
MM		 4297 err = l2cap_ertm_init(chan);
4298
4299 if (err < 0)
5e4e3972 4300 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4301 else
4302 l2cap_chan_ready(chan);
0565c1c2 4303
876d9484
MH		 4304 goto unlock;
4305 }
4306
c1360a1c 4307 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 4308 u8 buf[64];
1da177e4 4309 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2d792818 4310 l2cap_build_conf_req(chan, buf), buf);
73ffa904 4311 chan->num_conf_req++;
1da177e4
LT		 4312 }
4313
0e8b207e
AE		 4314 /* Got Conf Rsp PENDING from remote side and asume we sent
4315 Conf Rsp PENDING in the code above */
4316 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
29d8a590 4317 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
0e8b207e
AE		 4318
4319 /* check compatibility */
4320
79de886d 4321 /* Send rsp for BR/EDR channel */
f351bc72 4322 if (!chan->hs_hcon)
79de886d
AE		 4323 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4324 else
4325 chan->ident = cmd->ident;
0e8b207e
AE		 4326 }
4327
1da177e4 4328unlock:
6be36555 4329 l2cap_chan_unlock(chan);
3c588192 4330 return err;
1da177e4
LT		 4331}
4332
2d792818 4333static inline int l2cap_config_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4334 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4335 u8 *data)
1da177e4
LT		 4336{
4337 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4338 u16 scid, flags, result;
48454079 4339 struct l2cap_chan *chan;
cb3b3152 4340 int len = cmd_len - sizeof(*rsp);
3c588192 4341 int err = 0;
1da177e4 4342
cb3b3152
JH		 4343 if (cmd_len < sizeof(*rsp))
4344 return -EPROTO;
4345
1da177e4
LT		 4346 scid = __le16_to_cpu(rsp->scid);
4347 flags = __le16_to_cpu(rsp->flags);
4348 result = __le16_to_cpu(rsp->result);
4349
61386cba
AE		 4350 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4351 result, len);
1da177e4 4352
baa7e1fa 4353 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 4354 if (!chan)
1da177e4
LT		 4355 return 0;
4356
4357 switch (result) {
4358 case L2CAP_CONF_SUCCESS:
47d1ec61 4359 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 4360 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 4361 break;
4362
0e8b207e
AE		 4363 case L2CAP_CONF_PENDING:
4364 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4365
4366 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4367 char buf[64];
4368
4369 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4370 buf, &result);
0e8b207e 4371 if (len < 0) {
5e4e3972 4372 l2cap_send_disconn_req(chan, ECONNRESET);
0e8b207e
AE		 4373 goto done;
4374 }
4375
f351bc72 4376 if (!chan->hs_hcon) {
79de886d
AE		 4377 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4378 0);
5ce66b59
AE		 4379 } else {
4380 if (l2cap_check_efs(chan)) {
4381 amp_create_logical_link(chan);
4382 chan->ident = cmd->ident;
4383 }
4384 }
0e8b207e
AE		 4385 }
4386 goto done;
4387
1da177e4 4388 case L2CAP_CONF_UNACCEPT:
73ffa904 4389 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 4390 char req[64];
4391
c2c77ec8 4392 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
5e4e3972 4393 l2cap_send_disconn_req(chan, ECONNRESET);
c2c77ec8
AE		 4394 goto done;
4395 }
4396
f2fcfcd6
GP		 4397 /* throw out any old stored conf requests */
4398 result = L2CAP_CONF_SUCCESS;
b4450035 4399 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2d792818 4400 req, &result);
f2fcfcd6 4401 if (len < 0) {
5e4e3972 4402 l2cap_send_disconn_req(chan, ECONNRESET);
f2fcfcd6
GP		 4403 goto done;
4404 }
4405
4406 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2d792818 4407 L2CAP_CONF_REQ, len, req);
73ffa904 4408 chan->num_conf_req++;
f2fcfcd6
GP		 4409 if (result != L2CAP_CONF_SUCCESS)
4410 goto done;
4411 break;
1da177e4
LT		 4412 }
4413
8e87d142 4414 default:
6be36555 4415 l2cap_chan_set_err(chan, ECONNRESET);
2e0052e4 4416
ba13ccd9 4417 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
5e4e3972 4418 l2cap_send_disconn_req(chan, ECONNRESET);
1da177e4
LT		 4419 goto done;
4420 }
4421
59e54bd1 4422 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
1da177e4
LT		 4423 goto done;
4424
c1360a1c 4425 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 4426
c1360a1c 4427 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 4428 set_default_fcs(chan);
fcc203c3 4429
105bdf9e
MM		 4430 if (chan->mode == L2CAP_MODE_ERTM ||
4431 chan->mode == L2CAP_MODE_STREAMING)
3c588192 4432 err = l2cap_ertm_init(chan);
0565c1c2 4433
3c588192 4434 if (err < 0)
5e4e3972 4435 l2cap_send_disconn_req(chan, -err);
3c588192
MM		 4436 else
4437 l2cap_chan_ready(chan);
1da177e4
LT		 4438 }
4439
4440done:
6be36555 4441 l2cap_chan_unlock(chan);
3c588192 4442 return err;
1da177e4
LT		 4443}
4444
2d792818 4445static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
cb3b3152
JH		 4446 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4447 u8 *data)
1da177e4
LT		 4448{
4449 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4450 struct l2cap_disconn_rsp rsp;
4451 u16 dcid, scid;
48454079 4452 struct l2cap_chan *chan;
1da177e4 4453
cb3b3152
JH		 4454 if (cmd_len != sizeof(*req))
4455 return -EPROTO;
4456
1da177e4
LT		 4457 scid = __le16_to_cpu(req->scid);
4458 dcid = __le16_to_cpu(req->dcid);
4459
4460 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4461
3df91ea2
AE		 4462 mutex_lock(&conn->chan_lock);
4463
4464 chan = __l2cap_get_chan_by_scid(conn, dcid);
4465 if (!chan) {
4466 mutex_unlock(&conn->chan_lock);
662d652d
JH		 4467 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4468 return 0;
3df91ea2 4469 }
1da177e4 4470
6be36555
AE		 4471 l2cap_chan_lock(chan);
4472
fe4128e0
GP		 4473 rsp.dcid = cpu_to_le16(chan->scid);
4474 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 4475 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4476
5ec1bbe5 4477 chan->ops->set_shutdown(chan);
1da177e4 4478
61d6ef3e 4479 l2cap_chan_hold(chan);
48454079 4480 l2cap_chan_del(chan, ECONNRESET);
6be36555
AE		 4481
4482 l2cap_chan_unlock(chan);
1da177e4 4483
80b98027 4484 chan->ops->close(chan);
61d6ef3e 4485 l2cap_chan_put(chan);
3df91ea2
AE		 4486
4487 mutex_unlock(&conn->chan_lock);
4488
1da177e4
LT		 4489 return 0;
4490}
4491
2d792818 4492static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4493 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4494 u8 *data)
1da177e4
LT		 4495{
4496 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4497 u16 dcid, scid;
48454079 4498 struct l2cap_chan *chan;
1da177e4 4499
cb3b3152
JH		 4500 if (cmd_len != sizeof(*rsp))
4501 return -EPROTO;
4502
1da177e4
LT		 4503 scid = __le16_to_cpu(rsp->scid);
4504 dcid = __le16_to_cpu(rsp->dcid);
4505
4506 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4507
3df91ea2
AE		 4508 mutex_lock(&conn->chan_lock);
4509
4510 chan = __l2cap_get_chan_by_scid(conn, scid);
4511 if (!chan) {
4512 mutex_unlock(&conn->chan_lock);
1da177e4 4513 return 0;
3df91ea2 4514 }
1da177e4 4515
6be36555 4516 l2cap_chan_lock(chan);
48454079 4517
61d6ef3e 4518 l2cap_chan_hold(chan);
48454079 4519 l2cap_chan_del(chan, 0);
6be36555
AE		 4520
4521 l2cap_chan_unlock(chan);
1da177e4 4522
80b98027 4523 chan->ops->close(chan);
61d6ef3e 4524 l2cap_chan_put(chan);
3df91ea2
AE		 4525
4526 mutex_unlock(&conn->chan_lock);
4527
1da177e4
LT		 4528 return 0;
4529}
4530
2d792818 4531static inline int l2cap_information_req(struct l2cap_conn *conn,
cb3b3152
JH		 4532 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4533 u8 *data)
1da177e4
LT		 4534{
4535 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 4536 u16 type;
4537
cb3b3152
JH		 4538 if (cmd_len != sizeof(*req))
4539 return -EPROTO;
4540
1da177e4
LT		 4541 type = __le16_to_cpu(req->type);
4542
4543 BT_DBG("type 0x%4.4x", type);
4544
f0709e03
MH		 4545 if (type == L2CAP_IT_FEAT_MASK) {
4546 u8 buf[8];
44dd46de 4547 u32 feat_mask = l2cap_feat_mask;
f0709e03 4548 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
ac73498c
AE		 4549 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4550 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 4551 if (!disable_ertm)
fcc203c3 4552 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2d792818 4553 | L2CAP_FEAT_FCS;
848566b3 4554 if (conn->hs_enabled)
6327eb98 4555 feat_mask |= L2CAP_FEAT_EXT_FLOW
2d792818 4556 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 4557
1b7bf4ed 4558 put_unaligned_le32(feat_mask, rsp->data);
2d792818
GP		 4559 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4560 buf);
e1027a7c
MH		 4561 } else if (type == L2CAP_IT_FIXED_CHAN) {
4562 u8 buf[12];
4563 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd 4564
848566b3 4565 if (conn->hs_enabled)
50a147cd
MM		 4566 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4567 else
4568 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4569
ac73498c
AE		 4570 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4571 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 4572 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
2d792818
GP		 4573 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4574 buf);
f0709e03
MH		 4575 } else {
4576 struct l2cap_info_rsp rsp;
4577 rsp.type = cpu_to_le16(type);
ac73498c 4578 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
2d792818
GP		 4579 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4580 &rsp);
f0709e03 4581 }
1da177e4
LT		 4582
4583 return 0;
4584}
4585
2d792818 4586static inline int l2cap_information_rsp(struct l2cap_conn *conn,
cb3b3152
JH		 4587 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4588 u8 *data)
1da177e4
LT		 4589{
4590 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4591 u16 type, result;
4592
3f6fa3d4 4593 if (cmd_len < sizeof(*rsp))
cb3b3152
JH		 4594 return -EPROTO;
4595
1da177e4
LT		 4596 type = __le16_to_cpu(rsp->type);
4597 result = __le16_to_cpu(rsp->result);
4598
4599 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4600
e90165be
AE		 4601 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4602 if (cmd->ident != conn->info_ident ||
2d792818 4603 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
e90165be
AE		 4604 return 0;
4605
17cd3f37 4606 cancel_delayed_work(&conn->info_timer);
4e8402a3 4607
adb08ede
VT		 4608 if (result != L2CAP_IR_SUCCESS) {
4609 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4610 conn->info_ident = 0;
4611
4612 l2cap_conn_start(conn);
4613
4614 return 0;
4615 }
4616
978c93b9
AE		 4617 switch (type) {
4618 case L2CAP_IT_FEAT_MASK:
83985319 4619 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 4620
47ec1dcd 4621 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c 4622 struct l2cap_info_req req;
ac73498c 4623 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
e1027a7c
MH		 4624
4625 conn->info_ident = l2cap_get_ident(conn);
4626
4627 l2cap_send_cmd(conn, conn->info_ident,
2d792818 4628 L2CAP_INFO_REQ, sizeof(req), &req);
e1027a7c
MH		 4629 } else {
4630 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4631 conn->info_ident = 0;
4632
4633 l2cap_conn_start(conn);
4634 }
978c93b9
AE		 4635 break;
4636
4637 case L2CAP_IT_FIXED_CHAN:
4638 conn->fixed_chan_mask = rsp->data[0];
984947dc 4639 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 4640 conn->info_ident = 0;
984947dc
MH		 4641
4642 l2cap_conn_start(conn);
978c93b9 4643 break;
984947dc 4644 }
4e8402a3 4645
1da177e4
LT		 4646 return 0;
4647}
4648
1700915f
MM		 4649static int l2cap_create_channel_req(struct l2cap_conn *conn,
4650 struct l2cap_cmd_hdr *cmd,
4651 u16 cmd_len, void *data)
f94ff6ff
MM		 4652{
4653 struct l2cap_create_chan_req *req = data;
6e1df6a6 4654 struct l2cap_create_chan_rsp rsp;
1700915f 4655 struct l2cap_chan *chan;
6e1df6a6 4656 struct hci_dev *hdev;
f94ff6ff
MM		 4657 u16 psm, scid;
4658
4659 if (cmd_len != sizeof(*req))
4660 return -EPROTO;
4661
848566b3 4662 if (!conn->hs_enabled)
f94ff6ff
MM		 4663 return -EINVAL;
4664
4665 psm = le16_to_cpu(req->psm);
4666 scid = le16_to_cpu(req->scid);
4667
ad0ac6ca 4668 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
f94ff6ff 4669
6e1df6a6 4670 /* For controller id 0 make BR/EDR connection */
6ed971ca 4671 if (req->amp_id == AMP_ID_BREDR) {
6e1df6a6
AE		 4672 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4673 req->amp_id);
4674 return 0;
4675 }
1700915f 4676
6e1df6a6
AE		 4677 /* Validate AMP controller id */
4678 hdev = hci_dev_get(req->amp_id);
4679 if (!hdev)
4680 goto error;
1700915f 4681
6e1df6a6
AE		 4682 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4683 hci_dev_put(hdev);
4684 goto error;
4685 }
1700915f 4686
6e1df6a6
AE		 4687 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4688 req->amp_id);
4689 if (chan) {
4690 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4691 struct hci_conn *hs_hcon;
1700915f 4692
98e0f7ea
MH		 4693 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4694 &conn->hcon->dst);
6e1df6a6
AE		 4695 if (!hs_hcon) {
4696 hci_dev_put(hdev);
662d652d
JH		 4697 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4698 chan->dcid);
4699 return 0;
1700915f
MM		 4700 }
4701
6e1df6a6
AE		 4702 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4703
6e1df6a6
AE		 4704 mgr->bredr_chan = chan;
4705 chan->hs_hcon = hs_hcon;
fd45bf4c 4706 chan->fcs = L2CAP_FCS_NONE;
6e1df6a6 4707 conn->mtu = hdev->block_mtu;
1700915f 4708 }
f94ff6ff 4709
6e1df6a6 4710 hci_dev_put(hdev);
f94ff6ff
MM		 4711
4712 return 0;
6e1df6a6
AE		 4713
4714error:
4715 rsp.dcid = 0;
4716 rsp.scid = cpu_to_le16(scid);
4717 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4718 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4719
4720 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4721 sizeof(rsp), &rsp);
4722
dc280801 4723 return 0;
f94ff6ff
MM		 4724}
4725
8eb200bd
MM		 4726static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4727{
4728 struct l2cap_move_chan_req req;
4729 u8 ident;
4730
4731 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4732
4733 ident = l2cap_get_ident(chan->conn);
4734 chan->ident = ident;
4735
4736 req.icid = cpu_to_le16(chan->scid);
4737 req.dest_amp_id = dest_amp_id;
4738
4739 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4740 &req);
4741
4742 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4743}
4744
1500109b 4745static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4746{
4747 struct l2cap_move_chan_rsp rsp;
4748
1500109b 4749 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4750
1500109b 4751 rsp.icid = cpu_to_le16(chan->dcid);
8d5a04a1
MM		 4752 rsp.result = cpu_to_le16(result);
4753
1500109b
MM		 4754 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4755 sizeof(rsp), &rsp);
8d5a04a1
MM		 4756}
4757
5b155ef9 4758static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
8d5a04a1
MM		 4759{
4760 struct l2cap_move_chan_cfm cfm;
8d5a04a1 4761
5b155ef9 4762 BT_DBG("chan %p, result 0x%4.4x", chan, result);
8d5a04a1 4763
5b155ef9 4764 chan->ident = l2cap_get_ident(chan->conn);
8d5a04a1 4765
5b155ef9 4766 cfm.icid = cpu_to_le16(chan->scid);
8d5a04a1
MM		 4767 cfm.result = cpu_to_le16(result);
4768
5b155ef9
MM		 4769 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4770 sizeof(cfm), &cfm);
4771
4772 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4773}
4774
4775static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4776{
4777 struct l2cap_move_chan_cfm cfm;
4778
4779 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4780
4781 cfm.icid = cpu_to_le16(icid);
4782 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4783
4784 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4785 sizeof(cfm), &cfm);
8d5a04a1
MM		 4786}
4787
4788static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
ad0ac6ca 4789 u16 icid)
8d5a04a1
MM		 4790{
4791 struct l2cap_move_chan_cfm_rsp rsp;
4792
ad0ac6ca 4793 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1
MM		 4794
4795 rsp.icid = cpu_to_le16(icid);
4796 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4797}
4798
5f3847a4
MM		 4799static void __release_logical_link(struct l2cap_chan *chan)
4800{
4801 chan->hs_hchan = NULL;
4802 chan->hs_hcon = NULL;
4803
4804 /* Placeholder - release the logical link */
4805}
4806
1500109b
MM		 4807static void l2cap_logical_fail(struct l2cap_chan *chan)
4808{
4809 /* Logical link setup failed */
4810 if (chan->state != BT_CONNECTED) {
4811 /* Create channel failure, disconnect */
5e4e3972 4812 l2cap_send_disconn_req(chan, ECONNRESET);
1500109b
MM		 4813 return;
4814 }
4815
4816 switch (chan->move_role) {
4817 case L2CAP_MOVE_ROLE_RESPONDER:
4818 l2cap_move_done(chan);
4819 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4820 break;
4821 case L2CAP_MOVE_ROLE_INITIATOR:
4822 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4823 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4824 /* Remote has only sent pending or
4825 * success responses, clean up
4826 */
4827 l2cap_move_done(chan);
4828 }
4829
4830 /* Other amp move states imply that the move
4831 * has already aborted
4832 */
4833 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4834 break;
4835 }
4836}
4837
4838static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4839 struct hci_chan *hchan)
4840{
4841 struct l2cap_conf_rsp rsp;
1500109b 4842
336178a3 4843 chan->hs_hchan = hchan;
1500109b
MM		 4844 chan->hs_hcon->l2cap_data = chan->conn;
4845
35ba9561 4846 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
1500109b
MM		 4847
4848 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
fe79c6fe 4849 int err;
1500109b
MM		 4850
4851 set_default_fcs(chan);
4852
4853 err = l2cap_ertm_init(chan);
4854 if (err < 0)
5e4e3972 4855 l2cap_send_disconn_req(chan, -err);
1500109b
MM		 4856 else
4857 l2cap_chan_ready(chan);
4858 }
4859}
4860
4861static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4862 struct hci_chan *hchan)
4863{
4864 chan->hs_hcon = hchan->conn;
4865 chan->hs_hcon->l2cap_data = chan->conn;
4866
4867 BT_DBG("move_state %d", chan->move_state);
4868
4869 switch (chan->move_state) {
4870 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4871 /* Move confirm will be sent after a success
4872 * response is received
4873 */
4874 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4875 break;
4876 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4877 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4878 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4879 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4880 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4881 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4882 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4883 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4884 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4885 }
4886 break;
4887 default:
4888 /* Move was not in expected state, free the channel */
4889 __release_logical_link(chan);
4890
4891 chan->move_state = L2CAP_MOVE_STABLE;
4892 }
4893}
4894
4895/* Call with chan locked */
27695fb4
AE		 4896void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4897 u8 status)
5b155ef9 4898{
1500109b
MM		 4899 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4900
4901 if (status) {
4902 l2cap_logical_fail(chan);
4903 __release_logical_link(chan);
4904 return;
4905 }
4906
4907 if (chan->state != BT_CONNECTED) {
4908 /* Ignore logical link if channel is on BR/EDR */
6ed971ca 4909 if (chan->local_amp_id != AMP_ID_BREDR)
1500109b
MM		 4910 l2cap_logical_finish_create(chan, hchan);
4911 } else {
4912 l2cap_logical_finish_move(chan, hchan);
4913 }
5b155ef9
MM		 4914}
4915
3f7a56c4
MM		 4916void l2cap_move_start(struct l2cap_chan *chan)
4917{
4918 BT_DBG("chan %p", chan);
4919
6ed971ca 4920 if (chan->local_amp_id == AMP_ID_BREDR) {
3f7a56c4
MM		 4921 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4922 return;
4923 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4924 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4925 /* Placeholder - start physical link setup */
4926 } else {
4927 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4928 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4929 chan->move_id = 0;
4930 l2cap_move_setup(chan);
4931 l2cap_send_move_chan_req(chan, 0);
4932 }
4933}
4934
8eb200bd
MM		 4935static void l2cap_do_create(struct l2cap_chan *chan, int result,
4936 u8 local_amp_id, u8 remote_amp_id)
4937{
62748ca1
AE		 4938 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4939 local_amp_id, remote_amp_id);
4940
12d6cc60
AE		 4941 chan->fcs = L2CAP_FCS_NONE;
4942
62748ca1
AE		 4943 /* Outgoing channel on AMP */
4944 if (chan->state == BT_CONNECT) {
4945 if (result == L2CAP_CR_SUCCESS) {
4946 chan->local_amp_id = local_amp_id;
4947 l2cap_send_create_chan_req(chan, remote_amp_id);
4948 } else {
4949 /* Revert to BR/EDR connect */
4950 l2cap_send_conn_req(chan);
4951 }
4952
4953 return;
4954 }
4955
4956 /* Incoming channel on AMP */
4957 if (__l2cap_no_conn_pending(chan)) {
8eb200bd
MM		 4958 struct l2cap_conn_rsp rsp;
4959 char buf[128];
4960 rsp.scid = cpu_to_le16(chan->dcid);
4961 rsp.dcid = cpu_to_le16(chan->scid);
4962
8eb200bd
MM		 4963 if (result == L2CAP_CR_SUCCESS) {
4964 /* Send successful response */
62cd50e2
AE		 4965 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4966 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4967 } else {
4968 /* Send negative response */
62cd50e2
AE		 4969 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4970 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
8eb200bd
MM		 4971 }
4972
4973 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4974 sizeof(rsp), &rsp);
4975
4976 if (result == L2CAP_CR_SUCCESS) {
f93fa273 4977 l2cap_state_change(chan, BT_CONFIG);
8eb200bd
MM		 4978 set_bit(CONF_REQ_SENT, &chan->conf_state);
4979 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4980 L2CAP_CONF_REQ,
4981 l2cap_build_conf_req(chan, buf), buf);
4982 chan->num_conf_req++;
4983 }
8eb200bd
MM		 4984 }
4985}
4986
4987static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4988 u8 remote_amp_id)
4989{
4990 l2cap_move_setup(chan);
4991 chan->move_id = local_amp_id;
4992 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4993
4994 l2cap_send_move_chan_req(chan, remote_amp_id);
4995}
4996
4997static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4998{
4999 struct hci_chan *hchan = NULL;
5000
5001 /* Placeholder - get hci_chan for logical link */
5002
5003 if (hchan) {
5004 if (hchan->state == BT_CONNECTED) {
5005 /* Logical link is ready to go */
5006 chan->hs_hcon = hchan->conn;
5007 chan->hs_hcon->l2cap_data = chan->conn;
5008 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
5009 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
5010
5011 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5012 } else {
5013 /* Wait for logical link to be ready */
5014 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5015 }
5016 } else {
5017 /* Logical link not available */
5018 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
5019 }
5020}
5021
5022static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
5023{
5024 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
5025 u8 rsp_result;
5026 if (result == -EINVAL)
5027 rsp_result = L2CAP_MR_BAD_ID;
5028 else
5029 rsp_result = L2CAP_MR_NOT_ALLOWED;
5030
5031 l2cap_send_move_chan_rsp(chan, rsp_result);
5032 }
5033
5034 chan->move_role = L2CAP_MOVE_ROLE_NONE;
5035 chan->move_state = L2CAP_MOVE_STABLE;
5036
5037 /* Restart data transmission */
5038 l2cap_ertm_send(chan);
5039}
5040
a514b17f
AE		 5041/* Invoke with locked chan */
5042void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
8eb200bd 5043{
770bfefa 5044 u8 local_amp_id = chan->local_amp_id;
fffadc08 5045 u8 remote_amp_id = chan->remote_amp_id;
770bfefa 5046
8eb200bd
MM		 5047 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
5048 chan, result, local_amp_id, remote_amp_id);
5049
8eb200bd
MM		 5050 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
5051 l2cap_chan_unlock(chan);
5052 return;
5053 }
5054
5055 if (chan->state != BT_CONNECTED) {
5056 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
5057 } else if (result != L2CAP_MR_SUCCESS) {
5058 l2cap_do_move_cancel(chan, result);
5059 } else {
5060 switch (chan->move_role) {
5061 case L2CAP_MOVE_ROLE_INITIATOR:
5062 l2cap_do_move_initiate(chan, local_amp_id,
5063 remote_amp_id);
5064 break;
5065 case L2CAP_MOVE_ROLE_RESPONDER:
5066 l2cap_do_move_respond(chan, result);
5067 break;
5068 default:
5069 l2cap_do_move_cancel(chan, result);
5070 break;
5071 }
5072 }
8eb200bd
MM		 5073}
5074
8d5a04a1 5075static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
ad0ac6ca
AE		 5076 struct l2cap_cmd_hdr *cmd,
5077 u16 cmd_len, void *data)
8d5a04a1
MM		 5078{
5079 struct l2cap_move_chan_req *req = data;
1500109b 5080 struct l2cap_move_chan_rsp rsp;
02b0fbb9 5081 struct l2cap_chan *chan;
8d5a04a1
MM		 5082 u16 icid = 0;
5083 u16 result = L2CAP_MR_NOT_ALLOWED;
5084
5085 if (cmd_len != sizeof(*req))
5086 return -EPROTO;
5087
5088 icid = le16_to_cpu(req->icid);
5089
ad0ac6ca 5090 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
8d5a04a1 5091
848566b3 5092 if (!conn->hs_enabled)
8d5a04a1
MM		 5093 return -EINVAL;
5094
02b0fbb9
MM		 5095 chan = l2cap_get_chan_by_dcid(conn, icid);
5096 if (!chan) {
1500109b
MM		 5097 rsp.icid = cpu_to_le16(icid);
5098 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
5099 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
5100 sizeof(rsp), &rsp);
02b0fbb9
MM		 5101 return 0;
5102 }
5103
1500109b
MM		 5104 chan->ident = cmd->ident;
5105
02b0fbb9
MM		 5106 if (chan->scid < L2CAP_CID_DYN_START ||
5107 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
5108 (chan->mode != L2CAP_MODE_ERTM &&
5109 chan->mode != L2CAP_MODE_STREAMING)) {
5110 result = L2CAP_MR_NOT_ALLOWED;
5111 goto send_move_response;
5112 }
5113
5114 if (chan->local_amp_id == req->dest_amp_id) {
5115 result = L2CAP_MR_SAME_ID;
5116 goto send_move_response;
5117 }
5118
6ed971ca 5119 if (req->dest_amp_id != AMP_ID_BREDR) {
02b0fbb9
MM		 5120 struct hci_dev *hdev;
5121 hdev = hci_dev_get(req->dest_amp_id);
5122 if (!hdev || hdev->dev_type != HCI_AMP ||
5123 !test_bit(HCI_UP, &hdev->flags)) {
5124 if (hdev)
5125 hci_dev_put(hdev);
5126
5127 result = L2CAP_MR_BAD_ID;
5128 goto send_move_response;
5129 }
5130 hci_dev_put(hdev);
5131 }
5132
5133 /* Detect a move collision. Only send a collision response
5134 * if this side has "lost", otherwise proceed with the move.
5135 * The winner has the larger bd_addr.
5136 */
5137 if ((__chan_is_moving(chan) ||
5138 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
6f59b904 5139 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
02b0fbb9
MM		 5140 result = L2CAP_MR_COLLISION;
5141 goto send_move_response;
5142 }
5143
02b0fbb9
MM		 5144 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5145 l2cap_move_setup(chan);
5146 chan->move_id = req->dest_amp_id;
5147 icid = chan->dcid;
5148
6ed971ca 5149 if (req->dest_amp_id == AMP_ID_BREDR) {
02b0fbb9
MM		 5150 /* Moving to BR/EDR */
5151 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5152 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
5153 result = L2CAP_MR_PEND;
5154 } else {
5155 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
5156 result = L2CAP_MR_SUCCESS;
5157 }
5158 } else {
5159 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
5160 /* Placeholder - uncomment when amp functions are available */
5161 /*amp_accept_physical(chan, req->dest_amp_id);*/
5162 result = L2CAP_MR_PEND;
5163 }
5164
5165send_move_response:
1500109b 5166 l2cap_send_move_chan_rsp(chan, result);
8d5a04a1 5167
02b0fbb9
MM		 5168 l2cap_chan_unlock(chan);
5169
8d5a04a1
MM		 5170 return 0;
5171}
5172
5b155ef9
MM		 5173static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
5174{
5175 struct l2cap_chan *chan;
5176 struct hci_chan *hchan = NULL;
5177
5178 chan = l2cap_get_chan_by_scid(conn, icid);
5179 if (!chan) {
5180 l2cap_send_move_chan_cfm_icid(conn, icid);
5181 return;
5182 }
5183
5184 __clear_chan_timer(chan);
5185 if (result == L2CAP_MR_PEND)
5186 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
5187
5188 switch (chan->move_state) {
5189 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
5190 /* Move confirm will be sent when logical link
5191 * is complete.
5192 */
5193 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5194 break;
5195 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
5196 if (result == L2CAP_MR_PEND) {
5197 break;
5198 } else if (test_bit(CONN_LOCAL_BUSY,
5199 &chan->conn_state)) {
5200 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
5201 } else {
5202 /* Logical link is up or moving to BR/EDR,
5203 * proceed with move
5204 */
5205 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
5206 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5207 }
5208 break;
5209 case L2CAP_MOVE_WAIT_RSP:
5210 /* Moving to AMP */
5211 if (result == L2CAP_MR_SUCCESS) {
5212 /* Remote is ready, send confirm immediately
5213 * after logical link is ready
5214 */
5215 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
5216 } else {
5217 /* Both logical link and move success
5218 * are required to confirm
5219 */
5220 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
5221 }
5222
5223 /* Placeholder - get hci_chan for logical link */
5224 if (!hchan) {
5225 /* Logical link not available */
5226 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5227 break;
5228 }
5229
5230 /* If the logical link is not yet connected, do not
5231 * send confirmation.
5232 */
5233 if (hchan->state != BT_CONNECTED)
5234 break;
5235
5236 /* Logical link is already ready to go */
5237
5238 chan->hs_hcon = hchan->conn;
5239 chan->hs_hcon->l2cap_data = chan->conn;
5240
5241 if (result == L2CAP_MR_SUCCESS) {
5242 /* Can confirm now */
5243 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5244 } else {
5245 /* Now only need move success
5246 * to confirm
5247 */
5248 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5249 }
5250
5251 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5252 break;
5253 default:
5254 /* Any other amp move state means the move failed. */
5255 chan->move_id = chan->local_amp_id;
5256 l2cap_move_done(chan);
5257 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5258 }
5259
5260 l2cap_chan_unlock(chan);
5261}
5262
5263static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5264 u16 result)
5265{
5266 struct l2cap_chan *chan;
5267
5268 chan = l2cap_get_chan_by_ident(conn, ident);
5269 if (!chan) {
5270 /* Could not locate channel, icid is best guess */
5271 l2cap_send_move_chan_cfm_icid(conn, icid);
5272 return;
5273 }
5274
5275 __clear_chan_timer(chan);
5276
5277 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5278 if (result == L2CAP_MR_COLLISION) {
5279 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5280 } else {
5281 /* Cleanup - cancel move */
5282 chan->move_id = chan->local_amp_id;
5283 l2cap_move_done(chan);
5284 }
5285 }
5286
5287 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5288
5289 l2cap_chan_unlock(chan);
5290}
5291
5292static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5293 struct l2cap_cmd_hdr *cmd,
5294 u16 cmd_len, void *data)
8d5a04a1
MM		 5295{
5296 struct l2cap_move_chan_rsp *rsp = data;
5297 u16 icid, result;
5298
5299 if (cmd_len != sizeof(*rsp))
5300 return -EPROTO;
5301
5302 icid = le16_to_cpu(rsp->icid);
5303 result = le16_to_cpu(rsp->result);
5304
ad0ac6ca 5305 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5306
5b155ef9
MM		 5307 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5308 l2cap_move_continue(conn, icid, result);
5309 else
5310 l2cap_move_fail(conn, cmd->ident, icid, result);
8d5a04a1
MM		 5311
5312 return 0;
5313}
5314
5f3847a4
MM		 5315static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5316 struct l2cap_cmd_hdr *cmd,
5317 u16 cmd_len, void *data)
8d5a04a1
MM		 5318{
5319 struct l2cap_move_chan_cfm *cfm = data;
5f3847a4 5320 struct l2cap_chan *chan;
8d5a04a1
MM		 5321 u16 icid, result;
5322
5323 if (cmd_len != sizeof(*cfm))
5324 return -EPROTO;
5325
5326 icid = le16_to_cpu(cfm->icid);
5327 result = le16_to_cpu(cfm->result);
5328
ad0ac6ca 5329 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
8d5a04a1 5330
5f3847a4
MM		 5331 chan = l2cap_get_chan_by_dcid(conn, icid);
5332 if (!chan) {
5333 /* Spec requires a response even if the icid was not found */
5334 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5335 return 0;
5336 }
5337
5338 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5339 if (result == L2CAP_MC_CONFIRMED) {
5340 chan->local_amp_id = chan->move_id;
6ed971ca 5341 if (chan->local_amp_id == AMP_ID_BREDR)
5f3847a4
MM		 5342 __release_logical_link(chan);
5343 } else {
5344 chan->move_id = chan->local_amp_id;
5345 }
5346
5347 l2cap_move_done(chan);
5348 }
5349
8d5a04a1
MM		 5350 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5351
5f3847a4
MM		 5352 l2cap_chan_unlock(chan);
5353
8d5a04a1
MM		 5354 return 0;
5355}
5356
5357static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
ad0ac6ca
AE		 5358 struct l2cap_cmd_hdr *cmd,
5359 u16 cmd_len, void *data)
8d5a04a1
MM		 5360{
5361 struct l2cap_move_chan_cfm_rsp *rsp = data;
3fd71a0a 5362 struct l2cap_chan *chan;
8d5a04a1
MM		 5363 u16 icid;
5364
5365 if (cmd_len != sizeof(*rsp))
5366 return -EPROTO;
5367
5368 icid = le16_to_cpu(rsp->icid);
5369
ad0ac6ca 5370 BT_DBG("icid 0x%4.4x", icid);
8d5a04a1 5371
3fd71a0a
MM		 5372 chan = l2cap_get_chan_by_scid(conn, icid);
5373 if (!chan)
5374 return 0;
5375
5376 __clear_chan_timer(chan);
5377
5378 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5379 chan->local_amp_id = chan->move_id;
5380
6ed971ca 5381 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
3fd71a0a
MM		 5382 __release_logical_link(chan);
5383
5384 l2cap_move_done(chan);
5385 }
5386
5387 l2cap_chan_unlock(chan);
5388
8d5a04a1
MM		 5389 return 0;
5390}
5391
e2174ca4 5392static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2d792818 5393 u16 to_multiplier)
de73115a
CT		 5394{
5395 u16 max_latency;
5396
5397 if (min > max || min < 6 || max > 3200)
5398 return -EINVAL;
5399
5400 if (to_multiplier < 10 || to_multiplier > 3200)
5401 return -EINVAL;
5402
5403 if (max >= to_multiplier * 8)
5404 return -EINVAL;
5405
5406 max_latency = (to_multiplier * 8 / max) - 1;
5407 if (latency > 499 || latency > max_latency)
5408 return -EINVAL;
5409
5410 return 0;
5411}
5412
5413static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2d792818 5414 struct l2cap_cmd_hdr *cmd,
203e639e 5415 u16 cmd_len, u8 *data)
de73115a
CT		 5416{
5417 struct hci_conn *hcon = conn->hcon;
5418 struct l2cap_conn_param_update_req *req;
5419 struct l2cap_conn_param_update_rsp rsp;
203e639e 5420 u16 min, max, latency, to_multiplier;
2ce603eb 5421 int err;
de73115a
CT		 5422
5423 if (!(hcon->link_mode & HCI_LM_MASTER))
5424 return -EINVAL;
5425
de73115a
CT		 5426 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5427 return -EPROTO;
5428
5429 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 5430 min = __le16_to_cpu(req->min);
5431 max = __le16_to_cpu(req->max);
de73115a
CT		 5432 latency = __le16_to_cpu(req->latency);
5433 to_multiplier = __le16_to_cpu(req->to_multiplier);
5434
5435 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2d792818 5436 min, max, latency, to_multiplier);
de73115a
CT		 5437
5438 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 5439
5440 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5441 if (err)
ac73498c 5442 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
de73115a 5443 else
ac73498c 5444 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
de73115a
CT		 5445
5446 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2d792818 5447 sizeof(rsp), &rsp);
de73115a 5448
2ce603eb
CT		 5449 if (!err)
5450 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5451
de73115a
CT		 5452 return 0;
5453}
5454
f1496dee
JH		 5455static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5456 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5457 u8 *data)
5458{
5459 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5460 u16 dcid, mtu, mps, credits, result;
5461 struct l2cap_chan *chan;
5462 int err;
5463
5464 if (cmd_len < sizeof(*rsp))
5465 return -EPROTO;
5466
5467 dcid = __le16_to_cpu(rsp->dcid);
5468 mtu = __le16_to_cpu(rsp->mtu);
5469 mps = __le16_to_cpu(rsp->mps);
5470 credits = __le16_to_cpu(rsp->credits);
5471 result = __le16_to_cpu(rsp->result);
5472
5473 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5474 return -EPROTO;
5475
5476 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5477 dcid, mtu, mps, credits, result);
5478
5479 mutex_lock(&conn->chan_lock);
5480
5481 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5482 if (!chan) {
5483 err = -EBADSLT;
5484 goto unlock;
5485 }
5486
5487 err = 0;
5488
5489 l2cap_chan_lock(chan);
5490
5491 switch (result) {
5492 case L2CAP_CR_SUCCESS:
5493 chan->ident = 0;
5494 chan->dcid = dcid;
5495 chan->omtu = mtu;
5496 chan->remote_mps = mps;
0cd75f7e 5497 chan->tx_credits = credits;
f1496dee
JH		 5498 l2cap_chan_ready(chan);
5499 break;
5500
5501 default:
5502 l2cap_chan_del(chan, ECONNREFUSED);
5503 break;
5504 }
5505
5506 l2cap_chan_unlock(chan);
5507
5508unlock:
5509 mutex_unlock(&conn->chan_lock);
5510
5511 return err;
5512}
5513
3300d9a9 5514static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2d792818
GP		 5515 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5516 u8 *data)
3300d9a9
CT		 5517{
5518 int err = 0;
5519
5520 switch (cmd->code) {
5521 case L2CAP_COMMAND_REJ:
cb3b3152 5522 l2cap_command_rej(conn, cmd, cmd_len, data);
3300d9a9
CT		 5523 break;
5524
5525 case L2CAP_CONN_REQ:
cb3b3152 5526 err = l2cap_connect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5527 break;
5528
5529 case L2CAP_CONN_RSP:
f5a2598d 5530 case L2CAP_CREATE_CHAN_RSP:
9245e737 5531 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5532 break;
5533
5534 case L2CAP_CONF_REQ:
5535 err = l2cap_config_req(conn, cmd, cmd_len, data);
5536 break;
5537
5538 case L2CAP_CONF_RSP:
9245e737 5539 l2cap_config_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5540 break;
5541
5542 case L2CAP_DISCONN_REQ:
cb3b3152 5543 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5544 break;
5545
5546 case L2CAP_DISCONN_RSP:
9245e737 5547 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5548 break;
5549
5550 case L2CAP_ECHO_REQ:
5551 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5552 break;
5553
5554 case L2CAP_ECHO_RSP:
5555 break;
5556
5557 case L2CAP_INFO_REQ:
cb3b3152 5558 err = l2cap_information_req(conn, cmd, cmd_len, data);
3300d9a9
CT		 5559 break;
5560
5561 case L2CAP_INFO_RSP:
9245e737 5562 l2cap_information_rsp(conn, cmd, cmd_len, data);
3300d9a9
CT		 5563 break;
5564
f94ff6ff
MM		 5565 case L2CAP_CREATE_CHAN_REQ:
5566 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5567 break;
5568
8d5a04a1
MM		 5569 case L2CAP_MOVE_CHAN_REQ:
5570 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5571 break;
5572
5573 case L2CAP_MOVE_CHAN_RSP:
9245e737 5574 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5575 break;
5576
5577 case L2CAP_MOVE_CHAN_CFM:
5578 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5579 break;
5580
5581 case L2CAP_MOVE_CHAN_CFM_RSP:
9245e737 5582 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
8d5a04a1
MM		 5583 break;
5584
3300d9a9
CT		 5585 default:
5586 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5587 err = -EINVAL;
5588 break;
5589 }
5590
5591 return err;
5592}
5593
27e2d4c8
JH		 5594static int l2cap_le_connect_req(struct l2cap_conn *conn,
5595 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5596 u8 *data)
5597{
5598 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5599 struct l2cap_le_conn_rsp rsp;
5600 struct l2cap_chan *chan, *pchan;
0cd75f7e 5601 u16 dcid, scid, credits, mtu, mps;
27e2d4c8
JH		 5602 __le16 psm;
5603 u8 result;
5604
5605 if (cmd_len != sizeof(*req))
5606 return -EPROTO;
5607
5608 scid = __le16_to_cpu(req->scid);
5609 mtu = __le16_to_cpu(req->mtu);
5610 mps = __le16_to_cpu(req->mps);
5611 psm = req->psm;
5612 dcid = 0;
0cd75f7e 5613 credits = 0;
27e2d4c8
JH		 5614
5615 if (mtu < 23 || mps < 23)
5616 return -EPROTO;
5617
5618 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5619 scid, mtu, mps);
5620
5621 /* Check if we have socket listening on psm */
5622 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5623 &conn->hcon->dst, LE_LINK);
5624 if (!pchan) {
5625 result = L2CAP_CR_BAD_PSM;
5626 chan = NULL;
5627 goto response;
5628 }
5629
5630 mutex_lock(&conn->chan_lock);
5631 l2cap_chan_lock(pchan);
5632
5633 if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
5634 result = L2CAP_CR_AUTHENTICATION;
5635 chan = NULL;
5636 goto response_unlock;
5637 }
5638
5639 /* Check if we already have channel with that dcid */
5640 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5641 result = L2CAP_CR_NO_MEM;
5642 chan = NULL;
5643 goto response_unlock;
5644 }
5645
5646 chan = pchan->ops->new_connection(pchan);
5647 if (!chan) {
5648 result = L2CAP_CR_NO_MEM;
5649 goto response_unlock;
5650 }
5651
0ce43ce6
JH		 5652 l2cap_le_flowctl_init(chan);
5653
27e2d4c8
JH		 5654 bacpy(&chan->src, &conn->hcon->src);
5655 bacpy(&chan->dst, &conn->hcon->dst);
5656 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
5657 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
5658 chan->psm = psm;
5659 chan->dcid = scid;
5660 chan->omtu = mtu;
5661 chan->remote_mps = mps;
0cd75f7e 5662 chan->tx_credits = __le16_to_cpu(req->credits);
27e2d4c8
JH		 5663
5664 __l2cap_chan_add(conn, chan);
5665 dcid = chan->scid;
0cd75f7e 5666 credits = chan->rx_credits;
27e2d4c8
JH		 5667
5668 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5669
5670 chan->ident = cmd->ident;
5671
5672 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5673 l2cap_state_change(chan, BT_CONNECT2);
5674 result = L2CAP_CR_PEND;
5675 chan->ops->defer(chan);
5676 } else {
5677 l2cap_chan_ready(chan);
5678 result = L2CAP_CR_SUCCESS;
5679 }
5680
5681response_unlock:
5682 l2cap_chan_unlock(pchan);
5683 mutex_unlock(&conn->chan_lock);
5684
5685 if (result == L2CAP_CR_PEND)
5686 return 0;
5687
5688response:
5689 if (chan) {
5690 rsp.mtu = cpu_to_le16(chan->imtu);
3916aed8 5691 rsp.mps = cpu_to_le16(chan->mps);
27e2d4c8
JH		 5692 } else {
5693 rsp.mtu = 0;
5694 rsp.mps = 0;
5695 }
5696
5697 rsp.dcid = cpu_to_le16(dcid);
0cd75f7e 5698 rsp.credits = cpu_to_le16(credits);
27e2d4c8
JH		 5699 rsp.result = cpu_to_le16(result);
5700
5701 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5702
5703 return 0;
5704}
5705
fad5fc89
JH		 5706static inline int l2cap_le_credits(struct l2cap_conn *conn,
5707 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5708 u8 *data)
5709{
5710 struct l2cap_le_credits *pkt;
5711 struct l2cap_chan *chan;
5712 u16 cid, credits;
5713
5714 if (cmd_len != sizeof(*pkt))
5715 return -EPROTO;
5716
5717 pkt = (struct l2cap_le_credits *) data;
5718 cid = __le16_to_cpu(pkt->cid);
5719 credits = __le16_to_cpu(pkt->credits);
5720
5721 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5722
5723 chan = l2cap_get_chan_by_dcid(conn, cid);
5724 if (!chan)
5725 return -EBADSLT;
5726
5727 chan->tx_credits += credits;
5728
5729 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5730 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5731 chan->tx_credits--;
5732 }
5733
5734 if (chan->tx_credits)
5735 chan->ops->resume(chan);
5736
5737 l2cap_chan_unlock(chan);
5738
5739 return 0;
5740}
5741
71fb4197
JH		 5742static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5743 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5744 u8 *data)
5745{
5746 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5747 struct l2cap_chan *chan;
5748
5749 if (cmd_len < sizeof(*rej))
5750 return -EPROTO;
5751
5752 mutex_lock(&conn->chan_lock);
5753
5754 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5755 if (!chan)
5756 goto done;
5757
5758 l2cap_chan_lock(chan);
5759 l2cap_chan_del(chan, ECONNREFUSED);
5760 l2cap_chan_unlock(chan);
5761
5762done:
5763 mutex_unlock(&conn->chan_lock);
5764 return 0;
5765}
5766
3300d9a9 5767static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
203e639e
JH		 5768 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5769 u8 *data)
3300d9a9 5770{
b5ecba64
JH		 5771 int err = 0;
5772
3af8ace6
JH		 5773 if (!enable_lecoc) {
5774 switch (cmd->code) {
5775 case L2CAP_LE_CONN_REQ:
5776 case L2CAP_LE_CONN_RSP:
5777 case L2CAP_LE_CREDITS:
5778 case L2CAP_DISCONN_REQ:
5779 case L2CAP_DISCONN_RSP:
5780 return -EINVAL;
5781 }
5782 }
5783
3300d9a9
CT		 5784 switch (cmd->code) {
5785 case L2CAP_COMMAND_REJ:
71fb4197 5786 l2cap_le_command_rej(conn, cmd, cmd_len, data);
b5ecba64 5787 break;
3300d9a9
CT		 5788
5789 case L2CAP_CONN_PARAM_UPDATE_REQ:
b5ecba64
JH		 5790 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5791 break;
3300d9a9
CT		 5792
5793 case L2CAP_CONN_PARAM_UPDATE_RSP:
b5ecba64 5794 break;
3300d9a9 5795
f1496dee
JH		 5796 case L2CAP_LE_CONN_RSP:
5797 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5798 break;
f1496dee 5799
27e2d4c8 5800 case L2CAP_LE_CONN_REQ:
b5ecba64
JH		 5801 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5802 break;
27e2d4c8 5803
fad5fc89
JH		 5804 case L2CAP_LE_CREDITS:
5805 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5806 break;
5807
3defe01a 5808 case L2CAP_DISCONN_REQ:
b5ecba64
JH		 5809 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5810 break;
3defe01a
JH		 5811
5812 case L2CAP_DISCONN_RSP:
5813 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
b5ecba64 5814 break;
3defe01a 5815
3300d9a9
CT		 5816 default:
5817 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
b5ecba64
JH		 5818 err = -EINVAL;
5819 break;
3300d9a9 5820 }
b5ecba64
JH		 5821
5822 return err;
3300d9a9
CT		 5823}
5824
c5623556
JH		 5825static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5826 struct sk_buff *skb)
5827{
69c4e4e8 5828 struct hci_conn *hcon = conn->hcon;
4f3e219d
MH		 5829 struct l2cap_cmd_hdr *cmd;
5830 u16 len;
c5623556
JH		 5831 int err;
5832
69c4e4e8 5833 if (hcon->type != LE_LINK)
3b166295 5834 goto drop;
69c4e4e8 5835
4f3e219d
MH		 5836 if (skb->len < L2CAP_CMD_HDR_SIZE)
5837 goto drop;
c5623556 5838
4f3e219d
MH		 5839 cmd = (void *) skb->data;
5840 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
c5623556 5841
4f3e219d 5842 len = le16_to_cpu(cmd->len);
c5623556 5843
4f3e219d 5844 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
c5623556 5845
4f3e219d
MH		 5846 if (len != skb->len || !cmd->ident) {
5847 BT_DBG("corrupted command");
5848 goto drop;
5849 }
c5623556 5850
203e639e 5851 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
4f3e219d
MH		 5852 if (err) {
5853 struct l2cap_cmd_rej_unk rej;
c5623556 5854
4f3e219d 5855 BT_ERR("Wrong link type (%d)", err);
c5623556 5856
a521149a 5857 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
4f3e219d
MH		 5858 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5859 sizeof(rej), &rej);
c5623556
JH		 5860 }
5861
3b166295 5862drop:
c5623556
JH		 5863 kfree_skb(skb);
5864}
5865
3300d9a9 5866static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2d792818 5867 struct sk_buff *skb)
1da177e4 5868{
69c4e4e8 5869 struct hci_conn *hcon = conn->hcon;
1da177e4
LT		 5870 u8 *data = skb->data;
5871 int len = skb->len;
5872 struct l2cap_cmd_hdr cmd;
3300d9a9 5873 int err;
1da177e4
LT		 5874
5875 l2cap_raw_recv(conn, skb);
5876
69c4e4e8 5877 if (hcon->type != ACL_LINK)
3b166295 5878 goto drop;
69c4e4e8 5879
1da177e4 5880 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 5881 u16 cmd_len;
1da177e4
LT		 5882 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5883 data += L2CAP_CMD_HDR_SIZE;
5884 len -= L2CAP_CMD_HDR_SIZE;
5885
88219a0f 5886 cmd_len = le16_to_cpu(cmd.len);
1da177e4 5887
2d792818
GP		 5888 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5889 cmd.ident);
1da177e4 5890
88219a0f 5891 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 5892 BT_DBG("corrupted command");
5893 break;
5894 }
5895
c5623556 5896 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4 5897 if (err) {
e2fd318e 5898 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 5899
5900 BT_ERR("Wrong link type (%d)", err);
1da177e4 5901
a521149a 5902 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
2d792818
GP		 5903 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5904 sizeof(rej), &rej);
1da177e4
LT		 5905 }
5906
88219a0f
AV		 5907 data += cmd_len;
5908 len -= cmd_len;
1da177e4
LT		 5909 }
5910
3b166295 5911drop:
1da177e4
LT		 5912 kfree_skb(skb);
5913}
5914
47d1ec61 5915static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 5916{
5917 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 5918 int hdr_size;
5919
5920 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5921 hdr_size = L2CAP_EXT_HDR_SIZE;
5922 else
5923 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 5924
47d1ec61 5925 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 5926 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 5927 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5928 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5929
5930 if (our_fcs != rcv_fcs)
7a560e5c 5931 return -EBADMSG;
fcc203c3
GP		 5932 }
5933 return 0;
5934}
5935
6ea00485 5936static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 5937{
e31f7633 5938 struct l2cap_ctrl control;
d5392c8f 5939
e31f7633 5940 BT_DBG("chan %p", chan);
d5392c8f 5941
e31f7633
MM		 5942 memset(&control, 0, sizeof(control));
5943 control.sframe = 1;
5944 control.final = 1;
5945 control.reqseq = chan->buffer_seq;
5946 set_bit(CONN_SEND_FBIT, &chan->conn_state);
d5392c8f 5947
e2ab4353 5948 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
e31f7633
MM		 5949 control.super = L2CAP_SUPER_RNR;
5950 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5951 }
5952
e31f7633
MM		 5953 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5954 chan->unacked_frames > 0)
5955 __set_retrans_timer(chan);
d5392c8f 5956
e31f7633 5957 /* Send pending iframes */
525cd185 5958 l2cap_ertm_send(chan);
d5392c8f 5959
e2ab4353 5960 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
e31f7633
MM		 5961 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5962 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5963 * send it now.
5964 */
5965 control.super = L2CAP_SUPER_RR;
5966 l2cap_send_sframe(chan, &control);
d5392c8f
GP		 5967 }
5968}
5969
2d792818
GP		 5970static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5971 struct sk_buff **last_frag)
18778a63 5972{
84084a31
MM		 5973 /* skb->len reflects data in skb as well as all fragments
5974 * skb->data_len reflects only data in fragments
5975 */
5976 if (!skb_has_frag_list(skb))
5977 skb_shinfo(skb)->frag_list = new_frag;
5978
5979 new_frag->next = NULL;
5980
5981 (*last_frag)->next = new_frag;
5982 *last_frag = new_frag;
5983
5984 skb->len += new_frag->len;
5985 skb->data_len += new_frag->len;
5986 skb->truesize += new_frag->truesize;
5987}
5988
4b51dae9
MM		 5989static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5990 struct l2cap_ctrl *control)
84084a31
MM		 5991{
5992 int err = -EINVAL;
18778a63 5993
4b51dae9 5994 switch (control->sar) {
7e0ef6ee 5995 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 5996 if (chan->sdu)
5997 break;
18778a63 5998
80b98027 5999 err = chan->ops->recv(chan, skb);
84084a31 6000 break;
18778a63 6001
7e0ef6ee 6002 case L2CAP_SAR_START:
84084a31
MM		 6003 if (chan->sdu)
6004 break;
18778a63 6005
6f61fd47 6006 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 6007 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 6008
84084a31
MM		 6009 if (chan->sdu_len > chan->imtu) {
6010 err = -EMSGSIZE;
6011 break;
6012 }
1890d36b 6013
84084a31
MM		 6014 if (skb->len >= chan->sdu_len)
6015 break;
18778a63 6016
84084a31
MM		 6017 chan->sdu = skb;
6018 chan->sdu_last_frag = skb;
18778a63 6019
84084a31
MM		 6020 skb = NULL;
6021 err = 0;
18778a63
GP		 6022 break;
6023
7e0ef6ee 6024 case L2CAP_SAR_CONTINUE:
6f61fd47 6025 if (!chan->sdu)
84084a31 6026 break;
18778a63 6027
84084a31
MM		 6028 append_skb_frag(chan->sdu, skb,
6029 &chan->sdu_last_frag);
6030 skb = NULL;
18778a63 6031
84084a31
MM		 6032 if (chan->sdu->len >= chan->sdu_len)
6033 break;
4178ba46 6034
84084a31 6035 err = 0;
18778a63
GP		 6036 break;
6037
7e0ef6ee 6038 case L2CAP_SAR_END:
6f61fd47 6039 if (!chan->sdu)
84084a31 6040 break;
18778a63 6041
84084a31
MM		 6042 append_skb_frag(chan->sdu, skb,
6043 &chan->sdu_last_frag);
6044 skb = NULL;
4178ba46 6045
84084a31
MM		 6046 if (chan->sdu->len != chan->sdu_len)
6047 break;
18778a63 6048
80b98027 6049 err = chan->ops->recv(chan, chan->sdu);
1890d36b 6050
84084a31
MM		 6051 if (!err) {
6052 /* Reassembly complete */
6053 chan->sdu = NULL;
6054 chan->sdu_last_frag = NULL;
6055 chan->sdu_len = 0;
1890d36b 6056 }
18778a63
GP		 6057 break;
6058 }
6059
84084a31
MM		 6060 if (err) {
6061 kfree_skb(skb);
6062 kfree_skb(chan->sdu);
6063 chan->sdu = NULL;
6064 chan->sdu_last_frag = NULL;
6065 chan->sdu_len = 0;
6066 }
18778a63 6067
84084a31 6068 return err;
18778a63
GP		 6069}
6070
32b32735
MM		 6071static int l2cap_resegment(struct l2cap_chan *chan)
6072{
6073 /* Placeholder */
6074 return 0;
6075}
6076
61aa4f5b 6077void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
26f880d2 6078{
61aa4f5b 6079 u8 event;
712132eb 6080
61aa4f5b
MM		 6081 if (chan->mode != L2CAP_MODE_ERTM)
6082 return;
712132eb 6083
61aa4f5b 6084 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
401bb1f7 6085 l2cap_tx(chan, NULL, NULL, event);
1890d36b
GP		 6086}
6087
d2a7ac5d
MM		 6088static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
6089{
63838725
MM		 6090 int err = 0;
6091 /* Pass sequential frames to l2cap_reassemble_sdu()
6092 * until a gap is encountered.
6093 */
6094
6095 BT_DBG("chan %p", chan);
6096
6097 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6098 struct sk_buff *skb;
6099 BT_DBG("Searching for skb with txseq %d (queue len %d)",
6100 chan->buffer_seq, skb_queue_len(&chan->srej_q));
6101
6102 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
6103
6104 if (!skb)
6105 break;
6106
6107 skb_unlink(skb, &chan->srej_q);
6108 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6109 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
6110 if (err)
6111 break;
6112 }
6113
6114 if (skb_queue_empty(&chan->srej_q)) {
6115 chan->rx_state = L2CAP_RX_STATE_RECV;
6116 l2cap_send_ack(chan);
6117 }
6118
6119 return err;
d2a7ac5d
MM		 6120}
6121
6122static void l2cap_handle_srej(struct l2cap_chan *chan,
6123 struct l2cap_ctrl *control)
6124{
f80842a8
MM		 6125 struct sk_buff *skb;
6126
6127 BT_DBG("chan %p, control %p", chan, control);
6128
6129 if (control->reqseq == chan->next_tx_seq) {
6130 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 6131 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 6132 return;
6133 }
6134
6135 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
6136
6137 if (skb == NULL) {
6138 BT_DBG("Seq %d not available for retransmission",
6139 control->reqseq);
6140 return;
6141 }
6142
6143 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
6144 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 6145 l2cap_send_disconn_req(chan, ECONNRESET);
f80842a8
MM		 6146 return;
6147 }
6148
6149 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6150
6151 if (control->poll) {
6152 l2cap_pass_to_tx(chan, control);
6153
6154 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6155 l2cap_retransmit(chan, control);
6156 l2cap_ertm_send(chan);
6157
6158 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
6159 set_bit(CONN_SREJ_ACT, &chan->conn_state);
6160 chan->srej_save_reqseq = control->reqseq;
6161 }
6162 } else {
6163 l2cap_pass_to_tx_fbit(chan, control);
6164
6165 if (control->final) {
6166 if (chan->srej_save_reqseq != control->reqseq ||
6167 !test_and_clear_bit(CONN_SREJ_ACT,
6168 &chan->conn_state))
6169 l2cap_retransmit(chan, control);
6170 } else {
6171 l2cap_retransmit(chan, control);
6172 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
6173 set_bit(CONN_SREJ_ACT, &chan->conn_state);
6174 chan->srej_save_reqseq = control->reqseq;
6175 }
6176 }
6177 }
d2a7ac5d
MM		 6178}
6179
6180static void l2cap_handle_rej(struct l2cap_chan *chan,
6181 struct l2cap_ctrl *control)
6182{
fcd289df
MM		 6183 struct sk_buff *skb;
6184
6185 BT_DBG("chan %p, control %p", chan, control);
6186
6187 if (control->reqseq == chan->next_tx_seq) {
6188 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5e4e3972 6189 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6190 return;
6191 }
6192
6193 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
6194
6195 if (chan->max_tx && skb &&
6196 bt_cb(skb)->control.retries >= chan->max_tx) {
6197 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5e4e3972 6198 l2cap_send_disconn_req(chan, ECONNRESET);
fcd289df
MM		 6199 return;
6200 }
6201
6202 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6203
6204 l2cap_pass_to_tx(chan, control);
6205
6206 if (control->final) {
6207 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
6208 l2cap_retransmit_all(chan, control);
6209 } else {
6210 l2cap_retransmit_all(chan, control);
6211 l2cap_ertm_send(chan);
6212 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
6213 set_bit(CONN_REJ_ACT, &chan->conn_state);
6214 }
d2a7ac5d
MM		 6215}
6216
4b51dae9
MM		 6217static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
6218{
6219 BT_DBG("chan %p, txseq %d", chan, txseq);
6220
6221 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
6222 chan->expected_tx_seq);
6223
6224 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
6225 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
2d792818 6226 chan->tx_win) {
4b51dae9
MM		 6227 /* See notes below regarding "double poll" and
6228 * invalid packets.
6229 */
6230 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6231 BT_DBG("Invalid/Ignore - after SREJ");
6232 return L2CAP_TXSEQ_INVALID_IGNORE;
6233 } else {
6234 BT_DBG("Invalid - in window after SREJ sent");
6235 return L2CAP_TXSEQ_INVALID;
6236 }
6237 }
6238
6239 if (chan->srej_list.head == txseq) {
6240 BT_DBG("Expected SREJ");
6241 return L2CAP_TXSEQ_EXPECTED_SREJ;
6242 }
6243
6244 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6245 BT_DBG("Duplicate SREJ - txseq already stored");
6246 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6247 }
6248
6249 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6250 BT_DBG("Unexpected SREJ - not requested");
6251 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6252 }
6253 }
6254
6255 if (chan->expected_tx_seq == txseq) {
6256 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6257 chan->tx_win) {
6258 BT_DBG("Invalid - txseq outside tx window");
6259 return L2CAP_TXSEQ_INVALID;
6260 } else {
6261 BT_DBG("Expected");
6262 return L2CAP_TXSEQ_EXPECTED;
6263 }
6264 }
6265
6266 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
2d792818 6267 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
4b51dae9
MM		 6268 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6269 return L2CAP_TXSEQ_DUPLICATE;
6270 }
6271
6272 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6273 /* A source of invalid packets is a "double poll" condition,
6274 * where delays cause us to send multiple poll packets. If
6275 * the remote stack receives and processes both polls,
6276 * sequence numbers can wrap around in such a way that a
6277 * resent frame has a sequence number that looks like new data
6278 * with a sequence gap. This would trigger an erroneous SREJ
6279 * request.
6280 *
6281 * Fortunately, this is impossible with a tx window that's
6282 * less than half of the maximum sequence number, which allows
6283 * invalid frames to be safely ignored.
6284 *
6285 * With tx window sizes greater than half of the tx window
6286 * maximum, the frame is invalid and cannot be ignored. This
6287 * causes a disconnect.
6288 */
6289
6290 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6291 BT_DBG("Invalid/Ignore - txseq outside tx window");
6292 return L2CAP_TXSEQ_INVALID_IGNORE;
6293 } else {
6294 BT_DBG("Invalid - txseq outside tx window");
6295 return L2CAP_TXSEQ_INVALID;
6296 }
6297 } else {
6298 BT_DBG("Unexpected - txseq indicates missing frames");
6299 return L2CAP_TXSEQ_UNEXPECTED;
6300 }
6301}
6302
d2a7ac5d
MM		 6303static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6304 struct l2cap_ctrl *control,
6305 struct sk_buff *skb, u8 event)
6306{
6307 int err = 0;
941247f9 6308 bool skb_in_use = false;
d2a7ac5d
MM		 6309
6310 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6311 event);
6312
6313 switch (event) {
6314 case L2CAP_EV_RECV_IFRAME:
6315 switch (l2cap_classify_txseq(chan, control->txseq)) {
6316 case L2CAP_TXSEQ_EXPECTED:
6317 l2cap_pass_to_tx(chan, control);
6318
6319 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6320 BT_DBG("Busy, discarding expected seq %d",
6321 control->txseq);
6322 break;
6323 }
6324
6325 chan->expected_tx_seq = __next_seq(chan,
6326 control->txseq);
6327
6328 chan->buffer_seq = chan->expected_tx_seq;
941247f9 6329 skb_in_use = true;
d2a7ac5d
MM		 6330
6331 err = l2cap_reassemble_sdu(chan, skb, control);
6332 if (err)
6333 break;
6334
6335 if (control->final) {
6336 if (!test_and_clear_bit(CONN_REJ_ACT,
6337 &chan->conn_state)) {
6338 control->final = 0;
6339 l2cap_retransmit_all(chan, control);
6340 l2cap_ertm_send(chan);
6341 }
6342 }
6343
6344 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6345 l2cap_send_ack(chan);
6346 break;
6347 case L2CAP_TXSEQ_UNEXPECTED:
6348 l2cap_pass_to_tx(chan, control);
6349
6350 /* Can't issue SREJ frames in the local busy state.
6351 * Drop this frame, it will be seen as missing
6352 * when local busy is exited.
6353 */
6354 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6355 BT_DBG("Busy, discarding unexpected seq %d",
6356 control->txseq);
6357 break;
6358 }
6359
6360 /* There was a gap in the sequence, so an SREJ
6361 * must be sent for each missing frame. The
6362 * current frame is stored for later use.
6363 */
6364 skb_queue_tail(&chan->srej_q, skb);
941247f9 6365 skb_in_use = true;
d2a7ac5d
MM		 6366 BT_DBG("Queued %p (queue len %d)", skb,
6367 skb_queue_len(&chan->srej_q));
6368
6369 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6370 l2cap_seq_list_clear(&chan->srej_list);
6371 l2cap_send_srej(chan, control->txseq);
6372
6373 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6374 break;
6375 case L2CAP_TXSEQ_DUPLICATE:
6376 l2cap_pass_to_tx(chan, control);
6377 break;
6378 case L2CAP_TXSEQ_INVALID_IGNORE:
6379 break;
6380 case L2CAP_TXSEQ_INVALID:
6381 default:
5e4e3972 6382 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6383 break;
6384 }
6385 break;
6386 case L2CAP_EV_RECV_RR:
6387 l2cap_pass_to_tx(chan, control);
6388 if (control->final) {
6389 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6390
e6a3ee6e
MM		 6391 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6392 !__chan_is_moving(chan)) {
d2a7ac5d
MM		 6393 control->final = 0;
6394 l2cap_retransmit_all(chan, control);
6395 }
6396
6397 l2cap_ertm_send(chan);
6398 } else if (control->poll) {
6399 l2cap_send_i_or_rr_or_rnr(chan);
6400 } else {
6401 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6402 &chan->conn_state) &&
6403 chan->unacked_frames)
6404 __set_retrans_timer(chan);
6405
6406 l2cap_ertm_send(chan);
6407 }
6408 break;
6409 case L2CAP_EV_RECV_RNR:
6410 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6411 l2cap_pass_to_tx(chan, control);
6412 if (control && control->poll) {
6413 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6414 l2cap_send_rr_or_rnr(chan, 0);
6415 }
6416 __clear_retrans_timer(chan);
6417 l2cap_seq_list_clear(&chan->retrans_list);
6418 break;
6419 case L2CAP_EV_RECV_REJ:
6420 l2cap_handle_rej(chan, control);
6421 break;
6422 case L2CAP_EV_RECV_SREJ:
6423 l2cap_handle_srej(chan, control);
6424 break;
6425 default:
6426 break;
6427 }
6428
6429 if (skb && !skb_in_use) {
6430 BT_DBG("Freeing %p", skb);
6431 kfree_skb(skb);
6432 }
6433
6434 return err;
6435}
6436
6437static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6438 struct l2cap_ctrl *control,
6439 struct sk_buff *skb, u8 event)
6440{
6441 int err = 0;
6442 u16 txseq = control->txseq;
941247f9 6443 bool skb_in_use = false;
d2a7ac5d
MM		 6444
6445 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6446 event);
6447
6448 switch (event) {
6449 case L2CAP_EV_RECV_IFRAME:
6450 switch (l2cap_classify_txseq(chan, txseq)) {
6451 case L2CAP_TXSEQ_EXPECTED:
6452 /* Keep frame for reassembly later */
6453 l2cap_pass_to_tx(chan, control);
6454 skb_queue_tail(&chan->srej_q, skb);
941247f9 6455 skb_in_use = true;
d2a7ac5d
MM		 6456 BT_DBG("Queued %p (queue len %d)", skb,
6457 skb_queue_len(&chan->srej_q));
6458
6459 chan->expected_tx_seq = __next_seq(chan, txseq);
6460 break;
6461 case L2CAP_TXSEQ_EXPECTED_SREJ:
6462 l2cap_seq_list_pop(&chan->srej_list);
6463
6464 l2cap_pass_to_tx(chan, control);
6465 skb_queue_tail(&chan->srej_q, skb);
941247f9 6466 skb_in_use = true;
d2a7ac5d
MM		 6467 BT_DBG("Queued %p (queue len %d)", skb,
6468 skb_queue_len(&chan->srej_q));
6469
6470 err = l2cap_rx_queued_iframes(chan);
6471 if (err)
6472 break;
6473
6474 break;
6475 case L2CAP_TXSEQ_UNEXPECTED:
6476 /* Got a frame that can't be reassembled yet.
6477 * Save it for later, and send SREJs to cover
6478 * the missing frames.
6479 */
6480 skb_queue_tail(&chan->srej_q, skb);
941247f9 6481 skb_in_use = true;
d2a7ac5d
MM		 6482 BT_DBG("Queued %p (queue len %d)", skb,
6483 skb_queue_len(&chan->srej_q));
6484
6485 l2cap_pass_to_tx(chan, control);
6486 l2cap_send_srej(chan, control->txseq);
6487 break;
6488 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6489 /* This frame was requested with an SREJ, but
6490 * some expected retransmitted frames are
6491 * missing. Request retransmission of missing
6492 * SREJ'd frames.
6493 */
6494 skb_queue_tail(&chan->srej_q, skb);
941247f9 6495 skb_in_use = true;
d2a7ac5d
MM		 6496 BT_DBG("Queued %p (queue len %d)", skb,
6497 skb_queue_len(&chan->srej_q));
6498
6499 l2cap_pass_to_tx(chan, control);
6500 l2cap_send_srej_list(chan, control->txseq);
6501 break;
6502 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6503 /* We've already queued this frame. Drop this copy. */
6504 l2cap_pass_to_tx(chan, control);
6505 break;
6506 case L2CAP_TXSEQ_DUPLICATE:
6507 /* Expecting a later sequence number, so this frame
6508 * was already received. Ignore it completely.
6509 */
6510 break;
6511 case L2CAP_TXSEQ_INVALID_IGNORE:
6512 break;
6513 case L2CAP_TXSEQ_INVALID:
6514 default:
5e4e3972 6515 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6516 break;
6517 }
6518 break;
6519 case L2CAP_EV_RECV_RR:
6520 l2cap_pass_to_tx(chan, control);
6521 if (control->final) {
6522 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6523
6524 if (!test_and_clear_bit(CONN_REJ_ACT,
6525 &chan->conn_state)) {
6526 control->final = 0;
6527 l2cap_retransmit_all(chan, control);
6528 }
6529
6530 l2cap_ertm_send(chan);
6531 } else if (control->poll) {
6532 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6533 &chan->conn_state) &&
6534 chan->unacked_frames) {
6535 __set_retrans_timer(chan);
6536 }
6537
6538 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6539 l2cap_send_srej_tail(chan);
6540 } else {
6541 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6542 &chan->conn_state) &&
6543 chan->unacked_frames)
6544 __set_retrans_timer(chan);
6545
6546 l2cap_send_ack(chan);
6547 }
6548 break;
6549 case L2CAP_EV_RECV_RNR:
6550 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6551 l2cap_pass_to_tx(chan, control);
6552 if (control->poll) {
6553 l2cap_send_srej_tail(chan);
6554 } else {
6555 struct l2cap_ctrl rr_control;
6556 memset(&rr_control, 0, sizeof(rr_control));
6557 rr_control.sframe = 1;
6558 rr_control.super = L2CAP_SUPER_RR;
6559 rr_control.reqseq = chan->buffer_seq;
6560 l2cap_send_sframe(chan, &rr_control);
6561 }
6562
6563 break;
6564 case L2CAP_EV_RECV_REJ:
6565 l2cap_handle_rej(chan, control);
6566 break;
6567 case L2CAP_EV_RECV_SREJ:
6568 l2cap_handle_srej(chan, control);
6569 break;
6570 }
6571
6572 if (skb && !skb_in_use) {
6573 BT_DBG("Freeing %p", skb);
6574 kfree_skb(skb);
6575 }
6576
6577 return err;
6578}
6579
32b32735
MM		 6580static int l2cap_finish_move(struct l2cap_chan *chan)
6581{
6582 BT_DBG("chan %p", chan);
6583
6584 chan->rx_state = L2CAP_RX_STATE_RECV;
6585
6586 if (chan->hs_hcon)
6587 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6588 else
6589 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6590
6591 return l2cap_resegment(chan);
6592}
6593
6594static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6595 struct l2cap_ctrl *control,
6596 struct sk_buff *skb, u8 event)
6597{
6598 int err;
6599
6600 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6601 event);
6602
6603 if (!control->poll)
6604 return -EPROTO;
6605
6606 l2cap_process_reqseq(chan, control->reqseq);
6607
6608 if (!skb_queue_empty(&chan->tx_q))
6609 chan->tx_send_head = skb_peek(&chan->tx_q);
6610 else
6611 chan->tx_send_head = NULL;
6612
6613 /* Rewind next_tx_seq to the point expected
6614 * by the receiver.
6615 */
6616 chan->next_tx_seq = control->reqseq;
6617 chan->unacked_frames = 0;
6618
6619 err = l2cap_finish_move(chan);
6620 if (err)
6621 return err;
6622
6623 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6624 l2cap_send_i_or_rr_or_rnr(chan);
6625
6626 if (event == L2CAP_EV_RECV_IFRAME)
6627 return -EPROTO;
6628
6629 return l2cap_rx_state_recv(chan, control, NULL, event);
6630}
6631
6632static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6633 struct l2cap_ctrl *control,
6634 struct sk_buff *skb, u8 event)
6635{
6636 int err;
6637
6638 if (!control->final)
6639 return -EPROTO;
6640
6641 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6642
6643 chan->rx_state = L2CAP_RX_STATE_RECV;
6644 l2cap_process_reqseq(chan, control->reqseq);
6645
6646 if (!skb_queue_empty(&chan->tx_q))
6647 chan->tx_send_head = skb_peek(&chan->tx_q);
6648 else
6649 chan->tx_send_head = NULL;
6650
6651 /* Rewind next_tx_seq to the point expected
6652 * by the receiver.
6653 */
6654 chan->next_tx_seq = control->reqseq;
6655 chan->unacked_frames = 0;
6656
6657 if (chan->hs_hcon)
6658 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6659 else
6660 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6661
6662 err = l2cap_resegment(chan);
6663
6664 if (!err)
6665 err = l2cap_rx_state_recv(chan, control, skb, event);
6666
6667 return err;
6668}
6669
d2a7ac5d
MM		 6670static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6671{
6672 /* Make sure reqseq is for a packet that has been sent but not acked */
6673 u16 unacked;
6674
6675 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6676 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6677}
6678
cec8ab6e
MM		 6679static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6680 struct sk_buff *skb, u8 event)
218bb9df 6681{
d2a7ac5d
MM		 6682 int err = 0;
6683
6684 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6685 control, skb, event, chan->rx_state);
6686
6687 if (__valid_reqseq(chan, control->reqseq)) {
6688 switch (chan->rx_state) {
6689 case L2CAP_RX_STATE_RECV:
6690 err = l2cap_rx_state_recv(chan, control, skb, event);
6691 break;
6692 case L2CAP_RX_STATE_SREJ_SENT:
6693 err = l2cap_rx_state_srej_sent(chan, control, skb,
6694 event);
6695 break;
32b32735
MM		 6696 case L2CAP_RX_STATE_WAIT_P:
6697 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6698 break;
6699 case L2CAP_RX_STATE_WAIT_F:
6700 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6701 break;
d2a7ac5d
MM		 6702 default:
6703 /* shut it down */
6704 break;
6705 }
6706 } else {
6707 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6708 control->reqseq, chan->next_tx_seq,
6709 chan->expected_ack_seq);
5e4e3972 6710 l2cap_send_disconn_req(chan, ECONNRESET);
d2a7ac5d
MM		 6711 }
6712
6713 return err;
cec8ab6e
MM		 6714}
6715
6716static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6717 struct sk_buff *skb)
6718{
4b51dae9
MM		 6719 int err = 0;
6720
6721 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6722 chan->rx_state);
6723
6724 if (l2cap_classify_txseq(chan, control->txseq) ==
6725 L2CAP_TXSEQ_EXPECTED) {
6726 l2cap_pass_to_tx(chan, control);
6727
6728 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6729 __next_seq(chan, chan->buffer_seq));
6730
6731 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6732
6733 l2cap_reassemble_sdu(chan, skb, control);
6734 } else {
6735 if (chan->sdu) {
6736 kfree_skb(chan->sdu);
6737 chan->sdu = NULL;
6738 }
6739 chan->sdu_last_frag = NULL;
6740 chan->sdu_len = 0;
6741
6742 if (skb) {
6743 BT_DBG("Freeing %p", skb);
6744 kfree_skb(skb);
6745 }
6746 }
6747
6748 chan->last_acked_seq = control->txseq;
6749 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6750
6751 return err;
cec8ab6e
MM		 6752}
6753
6754static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6755{
6756 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6757 u16 len;
6758 u8 event;
218bb9df 6759
b76bbd66
MM		 6760 __unpack_control(chan, skb);
6761
218bb9df
GP		 6762 len = skb->len;
6763
6764 /*
6765 * We can just drop the corrupted I-frame here.
6766 * Receiver will miss it and start proper recovery
cec8ab6e 6767 * procedures and ask for retransmission.
218bb9df 6768 */
47d1ec61 6769 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 6770 goto drop;
6771
cec8ab6e 6772 if (!control->sframe && control->sar == L2CAP_SAR_START)
03a51213 6773 len -= L2CAP_SDULEN_SIZE;
218bb9df 6774
47d1ec61 6775 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 6776 len -= L2CAP_FCS_SIZE;
218bb9df 6777
47d1ec61 6778 if (len > chan->mps) {
5e4e3972 6779 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6780 goto drop;
6781 }
6782
cec8ab6e
MM		 6783 if (!control->sframe) {
6784 int err;
218bb9df 6785
cec8ab6e
MM		 6786 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6787 control->sar, control->reqseq, control->final,
6788 control->txseq);
218bb9df 6789
cec8ab6e
MM		 6790 /* Validate F-bit - F=0 always valid, F=1 only
6791 * valid in TX WAIT_F
6792 */
6793 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
218bb9df 6794 goto drop;
cec8ab6e
MM		 6795
6796 if (chan->mode != L2CAP_MODE_STREAMING) {
6797 event = L2CAP_EV_RECV_IFRAME;
6798 err = l2cap_rx(chan, control, skb, event);
6799 } else {
6800 err = l2cap_stream_rx(chan, control, skb);
218bb9df
GP		 6801 }
6802
cec8ab6e 6803 if (err)
5e4e3972 6804 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df 6805 } else {
cec8ab6e
MM		 6806 const u8 rx_func_to_event[4] = {
6807 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6808 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6809 };
6810
6811 /* Only I-frames are expected in streaming mode */
6812 if (chan->mode == L2CAP_MODE_STREAMING)
6813 goto drop;
6814
6815 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6816 control->reqseq, control->final, control->poll,
6817 control->super);
6818
218bb9df 6819 if (len != 0) {
1bb166e6 6820 BT_ERR("Trailing bytes: %d in sframe", len);
5e4e3972 6821 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6822 goto drop;
6823 }
6824
cec8ab6e
MM		 6825 /* Validate F and P bits */
6826 if (control->final && (control->poll ||
6827 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6828 goto drop;
6829
6830 event = rx_func_to_event[control->super];
6831 if (l2cap_rx(chan, control, skb, event))
5e4e3972 6832 l2cap_send_disconn_req(chan, ECONNRESET);
218bb9df
GP		 6833 }
6834
6835 return 0;
6836
6837drop:
6838 kfree_skb(skb);
6839 return 0;
6840}
6841
b1c325c2
JH		 6842static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6843{
6844 struct l2cap_conn *conn = chan->conn;
6845 struct l2cap_le_credits pkt;
6846 u16 return_credits;
6847
6848 /* We return more credits to the sender only after the amount of
6849 * credits falls below half of the initial amount.
6850 */
f15b8ecf 6851 if (chan->rx_credits >= (le_max_credits + 1) / 2)
b1c325c2
JH		 6852 return;
6853
f15b8ecf 6854 return_credits = le_max_credits - chan->rx_credits;
b1c325c2
JH		 6855
6856 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6857
6858 chan->rx_credits += return_credits;
6859
6860 pkt.cid = cpu_to_le16(chan->scid);
6861 pkt.credits = cpu_to_le16(return_credits);
6862
6863 chan->ident = l2cap_get_ident(conn);
6864
6865 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6866}
6867
fad5fc89
JH		 6868static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6869{
aac23bf6
JH		 6870 int err;
6871
6872 if (!chan->rx_credits) {
6873 BT_ERR("No credits to receive LE L2CAP data");
fad5fc89 6874 return -ENOBUFS;
aac23bf6 6875 }
fad5fc89 6876
aac23bf6
JH		 6877 if (chan->imtu < skb->len) {
6878 BT_ERR("Too big LE L2CAP PDU");
fad5fc89 6879 return -ENOBUFS;
aac23bf6 6880 }
fad5fc89
JH		 6881
6882 chan->rx_credits--;
6883 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6884
6885 l2cap_chan_le_send_credits(chan);
6886
aac23bf6
JH		 6887 err = 0;
6888
6889 if (!chan->sdu) {
6890 u16 sdu_len;
6891
6892 sdu_len = get_unaligned_le16(skb->data);
6893 skb_pull(skb, L2CAP_SDULEN_SIZE);
6894
6895 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6896 sdu_len, skb->len, chan->imtu);
6897
6898 if (sdu_len > chan->imtu) {
6899 BT_ERR("Too big LE L2CAP SDU length received");
6900 err = -EMSGSIZE;
6901 goto failed;
6902 }
6903
6904 if (skb->len > sdu_len) {
6905 BT_ERR("Too much LE L2CAP data received");
6906 err = -EINVAL;
6907 goto failed;
6908 }
6909
6910 if (skb->len == sdu_len)
6911 return chan->ops->recv(chan, skb);
6912
6913 chan->sdu = skb;
6914 chan->sdu_len = sdu_len;
6915 chan->sdu_last_frag = skb;
6916
6917 return 0;
6918 }
6919
6920 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6921 chan->sdu->len, skb->len, chan->sdu_len);
6922
6923 if (chan->sdu->len + skb->len > chan->sdu_len) {
6924 BT_ERR("Too much LE L2CAP data received");
6925 err = -EINVAL;
6926 goto failed;
6927 }
6928
6929 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6930 skb = NULL;
6931
6932 if (chan->sdu->len == chan->sdu_len) {
6933 err = chan->ops->recv(chan, chan->sdu);
6934 if (!err) {
6935 chan->sdu = NULL;
6936 chan->sdu_last_frag = NULL;
6937 chan->sdu_len = 0;
6938 }
6939 }
6940
6941failed:
6942 if (err) {
6943 kfree_skb(skb);
6944 kfree_skb(chan->sdu);
6945 chan->sdu = NULL;
6946 chan->sdu_last_frag = NULL;
6947 chan->sdu_len = 0;
6948 }
6949
6950 /* We can't return an error here since we took care of the skb
6951 * freeing internally. An error return would cause the caller to
6952 * do a double-free of the skb.
6953 */
6954 return 0;
fad5fc89
JH		 6955}
6956
13ca56e0
AE		 6957static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6958 struct sk_buff *skb)
1da177e4 6959{
48454079 6960 struct l2cap_chan *chan;
1da177e4 6961
baa7e1fa 6962 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 6963 if (!chan) {
97e8e89d
AE		 6964 if (cid == L2CAP_CID_A2MP) {
6965 chan = a2mp_channel_create(conn, skb);
6966 if (!chan) {
6967 kfree_skb(skb);
13ca56e0 6968 return;
97e8e89d
AE		 6969 }
6970
6971 l2cap_chan_lock(chan);
6972 } else {
6973 BT_DBG("unknown cid 0x%4.4x", cid);
6974 /* Drop packet and return */
6975 kfree_skb(skb);
13ca56e0 6976 return;
97e8e89d 6977 }
1da177e4
LT		 6978 }
6979
49208c9c 6980 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 6981
89bc500e 6982 if (chan->state != BT_CONNECTED)
1da177e4
LT		 6983 goto drop;
6984
0c1bc5c6 6985 switch (chan->mode) {
38319713 6986 case L2CAP_MODE_LE_FLOWCTL:
fad5fc89
JH		 6987 if (l2cap_le_data_rcv(chan, skb) < 0)
6988 goto drop;
6989
6990 goto done;
6991
1c2acffb
GP		 6992 case L2CAP_MODE_BASIC:
6993 /* If socket recv buffers overflows we drop data here
6994 * which is *bad* because L2CAP has to be reliable.
6995 * But we don't have any other choice. L2CAP doesn't
6996 * provide flow control mechanism. */
1da177e4 6997
0c1bc5c6 6998 if (chan->imtu < skb->len)
1c2acffb 6999 goto drop;
1da177e4 7000
80b98027 7001 if (!chan->ops->recv(chan, skb))
1c2acffb
GP		 7002 goto done;
7003 break;
7004
7005 case L2CAP_MODE_ERTM:
6840ed07 7006 case L2CAP_MODE_STREAMING:
cec8ab6e 7007 l2cap_data_rcv(chan, skb);
6840ed07
GP		 7008 goto done;
7009
1c2acffb 7010 default:
0c1bc5c6 7011 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 7012 break;
7013 }
1da177e4
LT		 7014
7015drop:
7016 kfree_skb(skb);
7017
7018done:
6be36555 7019 l2cap_chan_unlock(chan);
1da177e4
LT		 7020}
7021
84104b24
AE		 7022static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
7023 struct sk_buff *skb)
1da177e4 7024{
ae4fd2d3 7025 struct hci_conn *hcon = conn->hcon;
23691d75 7026 struct l2cap_chan *chan;
1da177e4 7027
ae4fd2d3
MH		 7028 if (hcon->type != ACL_LINK)
7029 goto drop;
7030
bf20fd4e
JH		 7031 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
7032 ACL_LINK);
23691d75 7033 if (!chan)
1da177e4
LT		 7034 goto drop;
7035
5b4cedaa 7036 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 7037
89bc500e 7038 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 7039 goto drop;
7040
e13e21dc 7041 if (chan->imtu < skb->len)
1da177e4
LT		 7042 goto drop;
7043
2edf870d 7044 /* Store remote BD_ADDR and PSM for msg_name */
06ae3314 7045 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
2edf870d
MH		 7046 bt_cb(skb)->psm = psm;
7047
80b98027 7048 if (!chan->ops->recv(chan, skb))
84104b24 7049 return;
1da177e4
LT		 7050
7051drop:
7052 kfree_skb(skb);
1da177e4
LT		 7053}
7054
72f78356 7055static void l2cap_att_channel(struct l2cap_conn *conn,
6810fca7 7056 struct sk_buff *skb)
9f69bda6 7057{
b99707d7 7058 struct hci_conn *hcon = conn->hcon;
23691d75 7059 struct l2cap_chan *chan;
9f69bda6 7060
b99707d7
MH		 7061 if (hcon->type != LE_LINK)
7062 goto drop;
7063
af1c0134 7064 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
06ae3314 7065 &hcon->src, &hcon->dst);
23691d75 7066 if (!chan)
9f69bda6
GP		 7067 goto drop;
7068
5b4cedaa 7069 BT_DBG("chan %p, len %d", chan, skb->len);
9f69bda6 7070
cc8dba2b
MH		 7071 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type))
7072 goto drop;
7073
e13e21dc 7074 if (chan->imtu < skb->len)
9f69bda6
GP		 7075 goto drop;
7076
80b98027 7077 if (!chan->ops->recv(chan, skb))
6810fca7 7078 return;
9f69bda6
GP		 7079
7080drop:
7081 kfree_skb(skb);
9f69bda6
GP		 7082}
7083
1da177e4
LT		 7084static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
7085{
7086 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 7087 u16 cid, len;
7088 __le16 psm;
1da177e4
LT		 7089
7090 skb_pull(skb, L2CAP_HDR_SIZE);
7091 cid = __le16_to_cpu(lh->cid);
7092 len = __le16_to_cpu(lh->len);
7093
1c2acffb
GP		 7094 if (len != skb->len) {
7095 kfree_skb(skb);
7096 return;
7097 }
7098
1da177e4
LT		 7099 BT_DBG("len %d, cid 0x%4.4x", len, cid);
7100
7101 switch (cid) {
8db4dc46 7102 case L2CAP_CID_SIGNALING:
1da177e4
LT		 7103 l2cap_sig_channel(conn, skb);
7104 break;
7105
8db4dc46 7106 case L2CAP_CID_CONN_LESS:
097db76c 7107 psm = get_unaligned((__le16 *) skb->data);
0181a70f 7108 skb_pull(skb, L2CAP_PSMLEN_SIZE);
1da177e4
LT		 7109 l2cap_conless_channel(conn, psm, skb);
7110 break;
7111
073d1cf3 7112 case L2CAP_CID_ATT:
72f78356 7113 l2cap_att_channel(conn, skb);
9f69bda6
GP		 7114 break;
7115
a2877629
MH		 7116 case L2CAP_CID_LE_SIGNALING:
7117 l2cap_le_sig_channel(conn, skb);
7118 break;
7119
b501d6a1
AB		 7120 case L2CAP_CID_SMP:
7121 if (smp_sig_channel(conn, skb))
7122 l2cap_conn_del(conn->hcon, EACCES);
7123 break;
7124
18722c24
JR		 7125 case L2CAP_FC_6LOWPAN:
7126 bt_6lowpan_recv(conn, skb);
7127 break;
7128
1da177e4
LT		 7129 default:
7130 l2cap_data_channel(conn, cid, skb);
7131 break;
7132 }
7133}
7134
7135/* ---- L2CAP interface with lower layer (HCI) ---- */
7136
686ebf28 7137int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 7138{
7139 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 7140 struct l2cap_chan *c;
1da177e4 7141
6ed93dc6 7142 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
1da177e4
LT		 7143
7144 /* Find listening sockets and check their link_mode */
23691d75
GP		 7145 read_lock(&chan_list_lock);
7146 list_for_each_entry(c, &chan_list, global_l) {
89bc500e 7147 if (c->state != BT_LISTEN)
1da177e4
LT		 7148 continue;
7149
7eafc59e 7150 if (!bacmp(&c->src, &hdev->bdaddr)) {
2af6b9d5 7151 lm1 |= HCI_LM_ACCEPT;
43bd0f32 7152 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 7153 lm1 |= HCI_LM_MASTER;
1da177e4 7154 exact++;
7eafc59e 7155 } else if (!bacmp(&c->src, BDADDR_ANY)) {
2af6b9d5 7156 lm2 |= HCI_LM_ACCEPT;
43bd0f32 7157 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 7158 lm2 |= HCI_LM_MASTER;
7159 }
1da177e4 7160 }
23691d75 7161 read_unlock(&chan_list_lock);
1da177e4
LT		 7162
7163 return exact ? lm1 : lm2;
7164}
7165
9e664631 7166void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 7167{
0139418c
MH		 7168 struct l2cap_conn *conn;
7169
6ed93dc6 7170 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1da177e4 7171
1da177e4 7172 if (!status) {
baf43251 7173 conn = l2cap_conn_add(hcon);
1da177e4
LT		 7174 if (conn)
7175 l2cap_conn_ready(conn);
ba6fc317 7176 } else {
e175072f 7177 l2cap_conn_del(hcon, bt_to_errno(status));
ba6fc317 7178 }
1da177e4
LT		 7179}
7180
686ebf28 7181int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 7182{
7183 struct l2cap_conn *conn = hcon->l2cap_data;
7184
7185 BT_DBG("hcon %p", hcon);
7186
686ebf28 7187 if (!conn)
9f5a0d7b 7188 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 7189 return conn->disc_reason;
7190}
7191
9e664631 7192void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 7193{
7194 BT_DBG("hcon %p reason %d", hcon, reason);
7195
18722c24
JR		 7196 bt_6lowpan_del_conn(hcon->l2cap_data);
7197
e175072f 7198 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 7199}
7200
4343478f 7201static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 7202{
715ec005 7203 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 7204 return;
7205
f62e4323 7206 if (encrypt == 0x00) {
4343478f 7207 if (chan->sec_level == BT_SECURITY_MEDIUM) {
ba13ccd9 7208 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 7209 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 7210 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 7211 } else {
4343478f 7212 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 7213 __clear_chan_timer(chan);
f62e4323
MH		 7214 }
7215}
7216
686ebf28 7217int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 7218{
0139418c 7219 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 7220 struct l2cap_chan *chan;
1da177e4 7221
0139418c 7222 if (!conn)
1da177e4 7223 return 0;
0139418c 7224
89d8b407 7225 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
1da177e4 7226
160dc6ac 7227 if (hcon->type == LE_LINK) {
35d4adcc
HG		 7228 if (!status && encrypt)
7229 smp_distribute_keys(conn, 0);
17cd3f37 7230 cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 7231 }
7232
3df91ea2 7233 mutex_lock(&conn->chan_lock);
1da177e4 7234
3df91ea2 7235 list_for_each_entry(chan, &conn->chan_l, list) {
6be36555 7236 l2cap_chan_lock(chan);
1da177e4 7237
89d8b407
AE		 7238 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7239 state_to_string(chan->state));
f1cb9af5 7240
78eb2f98
AE		 7241 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
7242 l2cap_chan_unlock(chan);
7243 continue;
7244 }
7245
073d1cf3 7246 if (chan->scid == L2CAP_CID_ATT) {
f1cb9af5
VCG		 7247 if (!status && encrypt) {
7248 chan->sec_level = hcon->sec_level;
cf4cd009 7249 l2cap_chan_ready(chan);
f1cb9af5
VCG		 7250 }
7251
6be36555 7252 l2cap_chan_unlock(chan);
f1cb9af5
VCG		 7253 continue;
7254 }
7255
96eff46e 7256 if (!__l2cap_no_conn_pending(chan)) {
6be36555 7257 l2cap_chan_unlock(chan);
6a8d3010
MH		 7258 continue;
7259 }
7260
89bc500e 7261 if (!status && (chan->state == BT_CONNECTED ||
2d792818 7262 chan->state == BT_CONFIG)) {
d97c899b 7263 chan->ops->resume(chan);
4343478f 7264 l2cap_check_encryption(chan, encrypt);
6be36555 7265 l2cap_chan_unlock(chan);
9719f8af
MH		 7266 continue;
7267 }
7268
89bc500e 7269 if (chan->state == BT_CONNECT) {
6d3c15da 7270 if (!status)
93c3e8f5 7271 l2cap_start_connection(chan);
6d3c15da 7272 else
ba13ccd9 7273 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
89bc500e 7274 } else if (chan->state == BT_CONNECT2) {
b1235d79 7275 struct l2cap_conn_rsp rsp;
df3c3931 7276 __u16 res, stat;
1da177e4 7277
b1235d79 7278 if (!status) {
bdc25783 7279 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
df3c3931
JH		 7280 res = L2CAP_CR_PEND;
7281 stat = L2CAP_CS_AUTHOR_PEND;
2dc4e510 7282 chan->ops->defer(chan);
df3c3931 7283 } else {
acdcabf5 7284 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 7285 res = L2CAP_CR_SUCCESS;
7286 stat = L2CAP_CS_NO_INFO;
7287 }
b1235d79 7288 } else {
acdcabf5 7289 l2cap_state_change(chan, BT_DISCONN);
ba13ccd9 7290 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 7291 res = L2CAP_CR_SEC_BLOCK;
7292 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 7293 }
7294
fe4128e0
GP		 7295 rsp.scid = cpu_to_le16(chan->dcid);
7296 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 7297 rsp.result = cpu_to_le16(res);
7298 rsp.status = cpu_to_le16(stat);
fc7f8a7e 7299 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
2d792818 7300 sizeof(rsp), &rsp);
2d369359
MM		 7301
7302 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7303 res == L2CAP_CR_SUCCESS) {
7304 char buf[128];
7305 set_bit(CONF_REQ_SENT, &chan->conf_state);
7306 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7307 L2CAP_CONF_REQ,
7308 l2cap_build_conf_req(chan, buf),
7309 buf);
7310 chan->num_conf_req++;
7311 }
b1235d79 7312 }
1da177e4 7313
6be36555 7314 l2cap_chan_unlock(chan);
1da177e4
LT		 7315 }
7316
3df91ea2 7317 mutex_unlock(&conn->chan_lock);
b1235d79 7318
1da177e4
LT		 7319 return 0;
7320}
7321
686ebf28 7322int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 7323{
7324 struct l2cap_conn *conn = hcon->l2cap_data;
d73a0988
AE		 7325 struct l2cap_hdr *hdr;
7326 int len;
1da177e4 7327
1d13a254
AE		 7328 /* For AMP controller do not create l2cap conn */
7329 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7330 goto drop;
1da177e4 7331
5a08ecce 7332 if (!conn)
baf43251 7333 conn = l2cap_conn_add(hcon);
5a08ecce
AE		 7334
7335 if (!conn)
1da177e4
LT		 7336 goto drop;
7337
7338 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7339
d73a0988
AE		 7340 switch (flags) {
7341 case ACL_START:
7342 case ACL_START_NO_FLUSH:
7343 case ACL_COMPLETE:
1da177e4
LT		 7344 if (conn->rx_len) {
7345 BT_ERR("Unexpected start frame (len %d)", skb->len);
7346 kfree_skb(conn->rx_skb);
7347 conn->rx_skb = NULL;
7348 conn->rx_len = 0;
7349 l2cap_conn_unreliable(conn, ECOMM);
7350 }
7351
aae7fe22
AE		 7352 /* Start fragment always begin with Basic L2CAP header */
7353 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 7354 BT_ERR("Frame is too short (len %d)", skb->len);
7355 l2cap_conn_unreliable(conn, ECOMM);
7356 goto drop;
7357 }
7358
7359 hdr = (struct l2cap_hdr *) skb->data;
7360 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7361
7362 if (len == skb->len) {
7363 /* Complete frame received */
7364 l2cap_recv_frame(conn, skb);
7365 return 0;
7366 }
7367
7368 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7369
7370 if (skb->len > len) {
7371 BT_ERR("Frame is too long (len %d, expected len %d)",
2d792818 7372 skb->len, len);
1da177e4
LT		 7373 l2cap_conn_unreliable(conn, ECOMM);
7374 goto drop;
7375 }
7376
7377 /* Allocate skb for the complete frame (with header) */
8bcde1f2 7378 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
af05b30b 7379 if (!conn->rx_skb)
1da177e4
LT		 7380 goto drop;
7381
d626f62b 7382 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7383 skb->len);
1da177e4 7384 conn->rx_len = len - skb->len;
d73a0988
AE		 7385 break;
7386
7387 case ACL_CONT:
1da177e4
LT		 7388 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7389
7390 if (!conn->rx_len) {
7391 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7392 l2cap_conn_unreliable(conn, ECOMM);
7393 goto drop;
7394 }
7395
7396 if (skb->len > conn->rx_len) {
7397 BT_ERR("Fragment is too long (len %d, expected %d)",
2d792818 7398 skb->len, conn->rx_len);
1da177e4
LT		 7399 kfree_skb(conn->rx_skb);
7400 conn->rx_skb = NULL;
7401 conn->rx_len = 0;
7402 l2cap_conn_unreliable(conn, ECOMM);
7403 goto drop;
7404 }
7405
d626f62b 7406 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
2d792818 7407 skb->len);
1da177e4
LT		 7408 conn->rx_len -= skb->len;
7409
7410 if (!conn->rx_len) {
c4e5bafa
JH		 7411 /* Complete frame received. l2cap_recv_frame
7412 * takes ownership of the skb so set the global
7413 * rx_skb pointer to NULL first.
7414 */
7415 struct sk_buff *rx_skb = conn->rx_skb;
1da177e4 7416 conn->rx_skb = NULL;
c4e5bafa 7417 l2cap_recv_frame(conn, rx_skb);
1da177e4 7418 }
d73a0988 7419 break;
1da177e4
LT		 7420 }
7421
7422drop:
7423 kfree_skb(skb);
7424 return 0;
7425}
7426
aef7d97c 7427static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 7428{
23691d75 7429 struct l2cap_chan *c;
1da177e4 7430
333055f2 7431 read_lock(&chan_list_lock);
1da177e4 7432
23691d75 7433 list_for_each_entry(c, &chan_list, global_l) {
fcb73338 7434 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7eafc59e 7435 &c->src, &c->dst,
fcb73338
AE		 7436 c->state, __le16_to_cpu(c->psm),
7437 c->scid, c->dcid, c->imtu, c->omtu,
7438 c->sec_level, c->mode);
61e1b4b7 7439 }
1da177e4 7440
333055f2 7441 read_unlock(&chan_list_lock);
1da177e4 7442
aef7d97c 7443 return 0;
1da177e4
LT		 7444}
7445
aef7d97c
MH		 7446static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7447{
7448 return single_open(file, l2cap_debugfs_show, inode->i_private);
7449}
7450
7451static const struct file_operations l2cap_debugfs_fops = {
7452 .open = l2cap_debugfs_open,
7453 .read = seq_read,
7454 .llseek = seq_lseek,
7455 .release = single_release,
7456};
7457
7458static struct dentry *l2cap_debugfs;
1da177e4 7459
64274518 7460int __init l2cap_init(void)
1da177e4
LT		 7461{
7462 int err;
be9d1227 7463
bb58f747 7464 err = l2cap_init_sockets();
1da177e4
LT		 7465 if (err < 0)
7466 return err;
7467
1120e4bf
MH		 7468 if (IS_ERR_OR_NULL(bt_debugfs))
7469 return 0;
7470
7471 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7472 NULL, &l2cap_debugfs_fops);
1da177e4 7473
f15b8ecf
JH		 7474 debugfs_create_u16("l2cap_le_max_credits", 0466, bt_debugfs,
7475 &le_max_credits);
7476 debugfs_create_u16("l2cap_le_default_mps", 0466, bt_debugfs,
7477 &le_default_mps);
7478
18722c24
JR		 7479 bt_6lowpan_init();
7480
1da177e4 7481 return 0;
1da177e4
LT		 7482}
7483
64274518 7484void l2cap_exit(void)
1da177e4 7485{
18722c24 7486 bt_6lowpan_cleanup();
aef7d97c 7487 debugfs_remove(l2cap_debugfs);
bb58f747 7488 l2cap_cleanup_sockets();
1da177e4
LT		 7489}
7490
d1c4a17d
GP		 7491module_param(disable_ertm, bool, 0644);
7492MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
ubuntu-zesty-kernel mirror