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Bluetooth: Remove l2cap priority from inside RFCOMM.
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / l2cap_core.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
590051de 6 Copyright (C) 2011 ProFUSION Embedded Systems
1da177e4
LT		 7
8 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
8e87d142
YH		 23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 25 SOFTWARE IS DISCLAIMED.
26*/
27
bb58f747 28/* Bluetooth L2CAP core. */
1da177e4 29
1da177e4
LT		 30#include <linux/module.h>
31
32#include <linux/types.h>
4fc268d2 33#include <linux/capability.h>
1da177e4
LT		 34#include <linux/errno.h>
35#include <linux/kernel.h>
1da177e4
LT		 36#include <linux/sched.h>
37#include <linux/slab.h>
38#include <linux/poll.h>
39#include <linux/fcntl.h>
40#include <linux/init.h>
41#include <linux/interrupt.h>
42#include <linux/socket.h>
43#include <linux/skbuff.h>
1da177e4 44#include <linux/list.h>
be9d1227 45#include <linux/device.h>
aef7d97c
MH		 46#include <linux/debugfs.h>
47#include <linux/seq_file.h>
af05b30b 48#include <linux/uaccess.h>
fcc203c3 49#include <linux/crc16.h>
1da177e4
LT		 50#include <net/sock.h>
51
52#include <asm/system.h>
1da177e4
LT		 53#include <asm/unaligned.h>
54
55#include <net/bluetooth/bluetooth.h>
56#include <net/bluetooth/hci_core.h>
57#include <net/bluetooth/l2cap.h>
b501d6a1 58#include <net/bluetooth/smp.h>
1da177e4 59
bb58f747 60int disable_ertm;
f0709e03 61
47ec1dcd 62static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
50a147cd 63static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
1da177e4 64
b5ad8b7f
JB		 65static LIST_HEAD(chan_list);
66static DEFINE_RWLOCK(chan_list_lock);
1da177e4 67
1da177e4
LT		 68static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
69 u8 code, u8 ident, u16 dlen, void *data);
4519de9a
GP		 70static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
71 void *data);
710f9b0a 72static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
4519de9a
GP		 73static void l2cap_send_disconn_req(struct l2cap_conn *conn,
74 struct l2cap_chan *chan, int err);
1da177e4 75
218bb9df
GP		 76static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
77
0139418c 78/* ---- L2CAP channels ---- */
71ba0e56 79
baa7e1fa 80static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
0139418c 81{
3d57dc68 82 struct l2cap_chan *c, *r = NULL;
baa7e1fa 83
3d57dc68
GP		 84 rcu_read_lock();
85
86 list_for_each_entry_rcu(c, &conn->chan_l, list) {
87 if (c->dcid == cid) {
88 r = c;
89 break;
90 }
0139418c 91 }
3d57dc68
GP		 92
93 rcu_read_unlock();
94 return r;
0139418c
MH		 95}
96
baa7e1fa 97static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 98{
3d57dc68 99 struct l2cap_chan *c, *r = NULL;
baa7e1fa 100
3d57dc68
GP		 101 rcu_read_lock();
102
103 list_for_each_entry_rcu(c, &conn->chan_l, list) {
104 if (c->scid == cid) {
105 r = c;
106 break;
107 }
0139418c 108 }
3d57dc68
GP		 109
110 rcu_read_unlock();
111 return r;
0139418c
MH		 112}
113
114/* Find channel with given SCID.
115 * Returns locked socket */
baa7e1fa 116static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 117{
48454079 118 struct l2cap_chan *c;
baa7e1fa 119
baa7e1fa 120 c = __l2cap_get_chan_by_scid(conn, cid);
48454079 121 if (c)
aa2ac881 122 lock_sock(c->sk);
48454079 123 return c;
0139418c
MH		 124}
125
baa7e1fa 126static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 127{
3d57dc68 128 struct l2cap_chan *c, *r = NULL;
baa7e1fa 129
3d57dc68
GP		 130 rcu_read_lock();
131
132 list_for_each_entry_rcu(c, &conn->chan_l, list) {
133 if (c->ident == ident) {
134 r = c;
135 break;
136 }
0139418c 137 }
3d57dc68
GP		 138
139 rcu_read_unlock();
140 return r;
0139418c
MH		 141}
142
baa7e1fa 143static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 144{
48454079 145 struct l2cap_chan *c;
baa7e1fa 146
baa7e1fa 147 c = __l2cap_get_chan_by_ident(conn, ident);
48454079 148 if (c)
aa2ac881 149 lock_sock(c->sk);
48454079 150 return c;
0139418c
MH		 151}
152
23691d75 153static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 154{
23691d75 155 struct l2cap_chan *c;
9e4425ff 156
23691d75
GP		 157 list_for_each_entry(c, &chan_list, global_l) {
158 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
250938cb 159 return c;
9e4425ff 160 }
250938cb 161 return NULL;
9e4425ff
GP		 162}
163
164int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
165{
73b2ec18
GP		 166 int err;
167
23691d75 168 write_lock_bh(&chan_list_lock);
9e4425ff 169
23691d75 170 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 171 err = -EADDRINUSE;
172 goto done;
9e4425ff
GP		 173 }
174
73b2ec18
GP		 175 if (psm) {
176 chan->psm = psm;
177 chan->sport = psm;
178 err = 0;
179 } else {
180 u16 p;
181
182 err = -EINVAL;
183 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 184 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 185 chan->psm = cpu_to_le16(p);
186 chan->sport = cpu_to_le16(p);
187 err = 0;
188 break;
189 }
190 }
9e4425ff 191
73b2ec18 192done:
23691d75 193 write_unlock_bh(&chan_list_lock);
73b2ec18 194 return err;
9e4425ff
GP		 195}
196
197int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
198{
23691d75 199 write_lock_bh(&chan_list_lock);
9e4425ff
GP		 200
201 chan->scid = scid;
202
23691d75 203 write_unlock_bh(&chan_list_lock);
9e4425ff
GP		 204
205 return 0;
206}
207
baa7e1fa 208static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 209{
8db4dc46 210 u16 cid = L2CAP_CID_DYN_START;
0139418c 211
8db4dc46 212 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 213 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 214 return cid;
215 }
216
217 return 0;
218}
219
badaaa00
GP		 220static char *state_to_string(int state)
221{
222 switch(state) {
223 case BT_CONNECTED:
224 return "BT_CONNECTED";
225 case BT_OPEN:
226 return "BT_OPEN";
227 case BT_BOUND:
228 return "BT_BOUND";
229 case BT_LISTEN:
230 return "BT_LISTEN";
231 case BT_CONNECT:
232 return "BT_CONNECT";
233 case BT_CONNECT2:
234 return "BT_CONNECT2";
235 case BT_CONFIG:
236 return "BT_CONFIG";
237 case BT_DISCONN:
238 return "BT_DISCONN";
239 case BT_CLOSED:
240 return "BT_CLOSED";
241 }
242
243 return "invalid state";
244}
245
89bc500e
GP		 246static void l2cap_state_change(struct l2cap_chan *chan, int state)
247{
badaaa00
GP		 248 BT_DBG("%p %s -> %s", chan, state_to_string(chan->state),
249 state_to_string(state));
250
89bc500e
GP		 251 chan->state = state;
252 chan->ops->state_change(chan->data, state);
253}
254
721c4181 255static void l2cap_chan_timeout(struct work_struct *work)
ab07801d 256{
721c4181
GP		 257 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
258 chan_timer.work);
ab07801d
GP		 259 struct sock *sk = chan->sk;
260 int reason;
261
89bc500e 262 BT_DBG("chan %p state %d", chan, chan->state);
ab07801d 263
721c4181 264 lock_sock(sk);
ab07801d 265
89bc500e 266 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 267 reason = ECONNREFUSED;
89bc500e 268 else if (chan->state == BT_CONNECT &&
ab07801d
GP		 269 chan->sec_level != BT_SECURITY_SDP)
270 reason = ECONNREFUSED;
271 else
272 reason = ETIMEDOUT;
273
0f852724 274 l2cap_chan_close(chan, reason);
ab07801d 275
721c4181 276 release_sock(sk);
ab07801d 277
ba3bd0ee 278 chan->ops->close(chan->data);
371fd835 279 l2cap_chan_put(chan);
ab07801d
GP		 280}
281
23691d75 282struct l2cap_chan *l2cap_chan_create(struct sock *sk)
48454079
GP		 283{
284 struct l2cap_chan *chan;
285
286 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
287 if (!chan)
288 return NULL;
289
290 chan->sk = sk;
291
23691d75
GP		 292 write_lock_bh(&chan_list_lock);
293 list_add(&chan->global_l, &chan_list);
294 write_unlock_bh(&chan_list_lock);
295
721c4181 296 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
ab07801d 297
89bc500e
GP		 298 chan->state = BT_OPEN;
299
71ba0e56
GP		 300 atomic_set(&chan->refcnt, 1);
301
abc545b8
SJ		 302 BT_DBG("sk %p chan %p", sk, chan);
303
48454079
GP		 304 return chan;
305}
306
23691d75 307void l2cap_chan_destroy(struct l2cap_chan *chan)
6ff5abbf 308{
23691d75
GP		 309 write_lock_bh(&chan_list_lock);
310 list_del(&chan->global_l);
311 write_unlock_bh(&chan_list_lock);
312
371fd835 313 l2cap_chan_put(chan);
6ff5abbf
GP		 314}
315
3d57dc68 316static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 317{
af05b30b 318 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
fe4128e0 319 chan->psm, chan->dcid);
0139418c 320
9f5a0d7b 321 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 322
8c1d787b 323 chan->conn = conn;
0139418c 324
715ec005 325 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
b62f328b
VT		 326 if (conn->hcon->type == LE_LINK) {
327 /* LE connection */
0c1bc5c6 328 chan->omtu = L2CAP_LE_DEFAULT_MTU;
fe4128e0
GP		 329 chan->scid = L2CAP_CID_LE_DATA;
330 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 331 } else {
332 /* Alloc CID for connection-oriented socket */
fe4128e0 333 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 334 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 335 }
715ec005 336 } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
0139418c 337 /* Connectionless socket */
fe4128e0
GP		 338 chan->scid = L2CAP_CID_CONN_LESS;
339 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 340 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 341 } else {
342 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 343 chan->scid = L2CAP_CID_SIGNALING;
344 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 345 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 346 }
347
8f7975b1
AE		 348 chan->local_id = L2CAP_BESTEFFORT_ID;
349 chan->local_stype = L2CAP_SERV_BESTEFFORT;
350 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
351 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
352 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
353 chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO;
354
371fd835 355 l2cap_chan_hold(chan);
baa7e1fa 356
3d57dc68 357 list_add_rcu(&chan->list, &conn->chan_l);
0139418c
MH		 358}
359
8e87d142 360/* Delete channel.
0139418c 361 * Must be called on the locked socket. */
4519de9a 362static void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 363{
48454079 364 struct sock *sk = chan->sk;
8c1d787b 365 struct l2cap_conn *conn = chan->conn;
0139418c
MH		 366 struct sock *parent = bt_sk(sk)->parent;
367
c9b66675 368 __clear_chan_timer(chan);
0139418c 369
49208c9c 370 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 371
8e87d142 372 if (conn) {
baa7e1fa 373 /* Delete from channel list */
3d57dc68
GP		 374 list_del_rcu(&chan->list);
375 synchronize_rcu();
376
371fd835 377 l2cap_chan_put(chan);
baa7e1fa 378
8c1d787b 379 chan->conn = NULL;
0139418c
MH		 380 hci_conn_put(conn->hcon);
381 }
382
89bc500e 383 l2cap_state_change(chan, BT_CLOSED);
0139418c
MH		 384 sock_set_flag(sk, SOCK_ZAPPED);
385
386 if (err)
387 sk->sk_err = err;
388
389 if (parent) {
390 bt_accept_unlink(sk);
391 parent->sk_data_ready(parent, 0);
392 } else
393 sk->sk_state_change(sk);
c13ffa62 394
c1360a1c
GP		 395 if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) &&
396 test_bit(CONF_INPUT_DONE, &chan->conf_state)))
6ff5abbf 397 return;
2ead70b8 398
58d35f87 399 skb_queue_purge(&chan->tx_q);
c13ffa62 400
0c1bc5c6 401 if (chan->mode == L2CAP_MODE_ERTM) {
c13ffa62
GP		 402 struct srej_list *l, *tmp;
403
1a09bcb9
GP		 404 __clear_retrans_timer(chan);
405 __clear_monitor_timer(chan);
406 __clear_ack_timer(chan);
c13ffa62 407
f1c6775b 408 skb_queue_purge(&chan->srej_q);
c13ffa62 409
39d5a3ee 410 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
c13ffa62
GP		 411 list_del(&l->list);
412 kfree(l);
413 }
414 }
0139418c
MH		 415}
416
4519de9a
GP		 417static void l2cap_chan_cleanup_listen(struct sock *parent)
418{
419 struct sock *sk;
420
421 BT_DBG("parent %p", parent);
422
423 /* Close not yet accepted channels */
0f852724 424 while ((sk = bt_accept_dequeue(parent, NULL))) {
ba3bd0ee 425 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
c9b66675 426 __clear_chan_timer(chan);
0f852724 427 lock_sock(sk);
ba3bd0ee 428 l2cap_chan_close(chan, ECONNRESET);
0f852724 429 release_sock(sk);
ba3bd0ee 430 chan->ops->close(chan->data);
0f852724 431 }
4519de9a
GP		 432}
433
0f852724 434void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 435{
436 struct l2cap_conn *conn = chan->conn;
437 struct sock *sk = chan->sk;
438
89bc500e 439 BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket);
4519de9a 440
89bc500e 441 switch (chan->state) {
4519de9a
GP		 442 case BT_LISTEN:
443 l2cap_chan_cleanup_listen(sk);
89bc500e
GP		 444
445 l2cap_state_change(chan, BT_CLOSED);
446 sock_set_flag(sk, SOCK_ZAPPED);
4519de9a
GP		 447 break;
448
449 case BT_CONNECTED:
450 case BT_CONFIG:
715ec005 451 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a 452 conn->hcon->type == ACL_LINK) {
c9b66675
GP		 453 __clear_chan_timer(chan);
454 __set_chan_timer(chan, sk->sk_sndtimeo);
4519de9a
GP		 455 l2cap_send_disconn_req(conn, chan, reason);
456 } else
457 l2cap_chan_del(chan, reason);
458 break;
459
460 case BT_CONNECT2:
715ec005 461 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a
GP		 462 conn->hcon->type == ACL_LINK) {
463 struct l2cap_conn_rsp rsp;
464 __u16 result;
465
466 if (bt_sk(sk)->defer_setup)
467 result = L2CAP_CR_SEC_BLOCK;
468 else
469 result = L2CAP_CR_BAD_PSM;
89bc500e 470 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 471
472 rsp.scid = cpu_to_le16(chan->dcid);
473 rsp.dcid = cpu_to_le16(chan->scid);
474 rsp.result = cpu_to_le16(result);
475 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
476 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
477 sizeof(rsp), &rsp);
478 }
479
480 l2cap_chan_del(chan, reason);
481 break;
482
483 case BT_CONNECT:
484 case BT_DISCONN:
485 l2cap_chan_del(chan, reason);
486 break;
487
488 default:
489 sock_set_flag(sk, SOCK_ZAPPED);
490 break;
491 }
492}
493
4343478f 494static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 495{
715ec005 496 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 497 switch (chan->sec_level) {
8556edd3
JH		 498 case BT_SECURITY_HIGH:
499 return HCI_AT_DEDICATED_BONDING_MITM;
500 case BT_SECURITY_MEDIUM:
501 return HCI_AT_DEDICATED_BONDING;
502 default:
503 return HCI_AT_NO_BONDING;
504 }
fe4128e0 505 } else if (chan->psm == cpu_to_le16(0x0001)) {
4343478f
GP		 506 if (chan->sec_level == BT_SECURITY_LOW)
507 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 508
4343478f 509 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 510 return HCI_AT_NO_BONDING_MITM;
00ae4af9 511 else
8556edd3 512 return HCI_AT_NO_BONDING;
00ae4af9 513 } else {
4343478f 514 switch (chan->sec_level) {
00ae4af9 515 case BT_SECURITY_HIGH:
8556edd3 516 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 517 case BT_SECURITY_MEDIUM:
8556edd3 518 return HCI_AT_GENERAL_BONDING;
00ae4af9 519 default:
8556edd3 520 return HCI_AT_NO_BONDING;
00ae4af9 521 }
0684e5f9 522 }
8556edd3
JH		 523}
524
525/* Service level security */
d45fc423 526int l2cap_chan_check_security(struct l2cap_chan *chan)
8556edd3 527{
8c1d787b 528 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 529 __u8 auth_type;
530
4343478f 531 auth_type = l2cap_get_auth_type(chan);
79d554a6 532
4343478f 533 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 534}
535
b5ad8b7f 536static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 537{
538 u8 id;
539
540 /* Get next available identificator.
541 * 1 - 128 are used by kernel.
542 * 129 - 199 are reserved.
543 * 200 - 254 are used by utilities like l2ping, etc.
544 */
545
546 spin_lock_bh(&conn->lock);
547
548 if (++conn->tx_ident > 128)
549 conn->tx_ident = 1;
550
551 id = conn->tx_ident;
552
553 spin_unlock_bh(&conn->lock);
554
555 return id;
556}
557
4519de9a 558static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 559{
560 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 561 u8 flags;
4e8402a3
MH		 562
563 BT_DBG("code 0x%2.2x", code);
564
565 if (!skb)
9a9c6a34 566 return;
4e8402a3 567
e702112f
AE		 568 if (lmp_no_flush_capable(conn->hcon->hdev))
569 flags = ACL_START_NO_FLUSH;
570 else
571 flags = ACL_START;
572
14b12d0b 573 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 574 skb->priority = HCI_PRIO_MAX;
14b12d0b 575
73d80deb
LAD		 576 hci_send_acl(conn->hchan, skb, flags);
577}
578
579static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
580{
581 struct hci_conn *hcon = chan->conn->hcon;
582 u16 flags;
583
584 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
585 skb->priority);
586
587 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
588 lmp_no_flush_capable(hcon->hdev))
589 flags = ACL_START_NO_FLUSH;
590 else
591 flags = ACL_START;
14b12d0b 592
73d80deb
LAD		 593 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
594 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 595}
596
88843ab0 597static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control)
1c2acffb
GP		 598{
599 struct sk_buff *skb;
600 struct l2cap_hdr *lh;
8c1d787b 601 struct l2cap_conn *conn = chan->conn;
e4ca6d98 602 int count, hlen;
fcc203c3 603
89bc500e 604 if (chan->state != BT_CONNECTED)
c13ffa62
GP		 605 return;
606
e4ca6d98
AE		 607 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
608 hlen = L2CAP_EXT_HDR_SIZE;
609 else
610 hlen = L2CAP_ENH_HDR_SIZE;
611
47d1ec61 612 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 613 hlen += L2CAP_FCS_SIZE;
1c2acffb 614
88843ab0 615 BT_DBG("chan %p, control 0x%8.8x", chan, control);
1c2acffb 616
fcc203c3 617 count = min_t(unsigned int, conn->mtu, hlen);
793c2f1c
AE		 618
619 control |= __set_sframe(chan);
1c2acffb 620
e2ab4353 621 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
03f6715d 622 control |= __set_ctrl_final(chan);
9e917af1 623
e2ab4353 624 if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state))
e3781735 625 control |= __set_ctrl_poll(chan);
f0946ccf 626
1c2acffb
GP		 627 skb = bt_skb_alloc(count, GFP_ATOMIC);
628 if (!skb)
9a9c6a34 629 return;
1c2acffb
GP		 630
631 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fcc203c3 632 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
fe4128e0 633 lh->cid = cpu_to_le16(chan->dcid);
88843ab0
AE		 634
635 __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
1c2acffb 636
47d1ec61 637 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 638 u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE);
639 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 640 }
641
73d80deb
LAD		 642 skb->priority = HCI_PRIO_MAX;
643 l2cap_do_send(chan, skb);
1c2acffb
GP		 644}
645
88843ab0 646static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control)
7e743090 647{
e2ab4353 648 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 649 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
e2ab4353 650 set_bit(CONN_RNR_SENT, &chan->conn_state);
1890d36b 651 } else
ab784b73 652 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
7e743090 653
0b209fae 654 control |= __set_reqseq(chan, chan->buffer_seq);
2ab25cdd 655
525cd185 656 l2cap_send_sframe(chan, control);
7e743090
GP		 657}
658
b4450035 659static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 660{
c1360a1c 661 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 662}
663
fc7f8a7e 664static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 665{
8c1d787b 666 struct l2cap_conn *conn = chan->conn;
79d554a6
MH		 667
668 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 669 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
670 return;
671
d45fc423 672 if (l2cap_chan_check_security(chan) &&
4343478f 673 __l2cap_no_conn_pending(chan)) {
b1235d79 674 struct l2cap_conn_req req;
fe4128e0
GP		 675 req.scid = cpu_to_le16(chan->scid);
676 req.psm = chan->psm;
79d554a6 677
fc7f8a7e 678 chan->ident = l2cap_get_ident(conn);
c1360a1c 679 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
79d554a6 680
fc7f8a7e
GP		 681 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
682 sizeof(req), &req);
b1235d79 683 }
79d554a6
MH		 684 } else {
685 struct l2cap_info_req req;
686 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
687
688 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
689 conn->info_ident = l2cap_get_ident(conn);
690
030013d8 691 schedule_delayed_work(&conn->info_timer,
79d554a6
MH		 692 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
693
694 l2cap_send_cmd(conn, conn->info_ident,
695 L2CAP_INFO_REQ, sizeof(req), &req);
696 }
697}
698
cf6c2c0b
GP		 699static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
700{
701 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 702 if (!disable_ertm)
cf6c2c0b
GP		 703 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
704
705 switch (mode) {
706 case L2CAP_MODE_ERTM:
707 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
708 case L2CAP_MODE_STREAMING:
709 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
710 default:
711 return 0x00;
712 }
713}
714
4519de9a 715static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
22121fc9 716{
e92c8e70 717 struct sock *sk;
22121fc9
GP		 718 struct l2cap_disconn_req req;
719
c13ffa62
GP		 720 if (!conn)
721 return;
722
e92c8e70
GP		 723 sk = chan->sk;
724
0c1bc5c6 725 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 726 __clear_retrans_timer(chan);
727 __clear_monitor_timer(chan);
728 __clear_ack_timer(chan);
c13ffa62
GP		 729 }
730
fe4128e0
GP		 731 req.dcid = cpu_to_le16(chan->dcid);
732 req.scid = cpu_to_le16(chan->scid);
22121fc9
GP		 733 l2cap_send_cmd(conn, l2cap_get_ident(conn),
734 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62 735
89bc500e 736 l2cap_state_change(chan, BT_DISCONN);
9b108fc0 737 sk->sk_err = err;
22121fc9
GP		 738}
739
1da177e4 740/* ---- L2CAP connections ---- */
4e8402a3
MH		 741static void l2cap_conn_start(struct l2cap_conn *conn)
742{
3d57dc68 743 struct l2cap_chan *chan;
4e8402a3
MH		 744
745 BT_DBG("conn %p", conn);
746
3d57dc68 747 rcu_read_lock();
4e8402a3 748
3d57dc68 749 list_for_each_entry_rcu(chan, &conn->chan_l, list) {
48454079 750 struct sock *sk = chan->sk;
baa7e1fa 751
4e8402a3
MH		 752 bh_lock_sock(sk);
753
715ec005 754 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
79d554a6
MH		 755 bh_unlock_sock(sk);
756 continue;
757 }
758
89bc500e 759 if (chan->state == BT_CONNECT) {
47731de7 760 struct l2cap_conn_req req;
79d554a6 761
d45fc423 762 if (!l2cap_chan_check_security(chan) ||
b4450035 763 !__l2cap_no_conn_pending(chan)) {
47731de7
GP		 764 bh_unlock_sock(sk);
765 continue;
766 }
79d554a6 767
c1360a1c
GP		 768 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
769 && test_bit(CONF_STATE2_DEVICE,
770 &chan->conf_state)) {
0f852724 771 /* l2cap_chan_close() calls list_del(chan)
820ffdb3 772 * so release the lock */
89bc500e 773 l2cap_chan_close(chan, ECONNRESET);
47731de7
GP		 774 bh_unlock_sock(sk);
775 continue;
b1235d79 776 }
47731de7 777
fe4128e0
GP		 778 req.scid = cpu_to_le16(chan->scid);
779 req.psm = chan->psm;
47731de7 780
fc7f8a7e 781 chan->ident = l2cap_get_ident(conn);
c1360a1c 782 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
47731de7 783
fc7f8a7e
GP		 784 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
785 sizeof(req), &req);
47731de7 786
89bc500e 787 } else if (chan->state == BT_CONNECT2) {
79d554a6 788 struct l2cap_conn_rsp rsp;
e9aeb2dd 789 char buf[128];
fe4128e0
GP		 790 rsp.scid = cpu_to_le16(chan->dcid);
791 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 792
d45fc423 793 if (l2cap_chan_check_security(chan)) {
f66dc81f
MH		 794 if (bt_sk(sk)->defer_setup) {
795 struct sock *parent = bt_sk(sk)->parent;
796 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
797 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
05e9a2f6
IK		 798 if (parent)
799 parent->sk_data_ready(parent, 0);
f66dc81f
MH		 800
801 } else {
89bc500e 802 l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 803 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
804 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
805 }
79d554a6
MH		 806 } else {
807 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
808 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
809 }
810
fc7f8a7e
GP		 811 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
812 sizeof(rsp), &rsp);
e9aeb2dd 813
c1360a1c 814 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
e9aeb2dd
GP		 815 rsp.result != L2CAP_CR_SUCCESS) {
816 bh_unlock_sock(sk);
817 continue;
818 }
819
c1360a1c 820 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 821 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 822 l2cap_build_conf_req(chan, buf), buf);
823 chan->num_conf_req++;
4e8402a3
MH		 824 }
825
826 bh_unlock_sock(sk);
827 }
828
3d57dc68 829 rcu_read_unlock();
4e8402a3
MH		 830}
831
b62f328b
VT		 832/* Find socket with cid and source bdaddr.
833 * Returns closest match, locked.
834 */
23691d75 835static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src)
b62f328b 836{
23691d75 837 struct l2cap_chan *c, *c1 = NULL;
b62f328b 838
23691d75 839 read_lock(&chan_list_lock);
b62f328b 840
23691d75
GP		 841 list_for_each_entry(c, &chan_list, global_l) {
842 struct sock *sk = c->sk;
fe4128e0 843
89bc500e 844 if (state && c->state != state)
b62f328b
VT		 845 continue;
846
23691d75 847 if (c->scid == cid) {
b62f328b 848 /* Exact match. */
23691d75
GP		 849 if (!bacmp(&bt_sk(sk)->src, src)) {
850 read_unlock(&chan_list_lock);
851 return c;
852 }
b62f328b
VT		 853
854 /* Closest match */
855 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
23691d75 856 c1 = c;
b62f328b
VT		 857 }
858 }
280f294f 859
23691d75 860 read_unlock(&chan_list_lock);
b62f328b 861
23691d75 862 return c1;
b62f328b
VT		 863}
864
865static void l2cap_le_conn_ready(struct l2cap_conn *conn)
866{
c916fbe4 867 struct sock *parent, *sk;
23691d75 868 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 869
870 BT_DBG("");
871
872 /* Check if we have socket listening on cid */
23691d75 873 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
b62f328b 874 conn->src);
23691d75 875 if (!pchan)
b62f328b
VT		 876 return;
877
23691d75
GP		 878 parent = pchan->sk;
879
aa2ac881 880 lock_sock(parent);
62f3a2cf 881
b62f328b
VT		 882 /* Check for backlog size */
883 if (sk_acceptq_is_full(parent)) {
884 BT_DBG("backlog full %d", parent->sk_ack_backlog);
885 goto clean;
886 }
887
80808e43
GP		 888 chan = pchan->ops->new_connection(pchan->data);
889 if (!chan)
b62f328b
VT		 890 goto clean;
891
80808e43 892 sk = chan->sk;
5d41ce1d 893
b62f328b
VT		 894 hci_conn_hold(conn->hcon);
895
b62f328b
VT		 896 bacpy(&bt_sk(sk)->src, conn->src);
897 bacpy(&bt_sk(sk)->dst, conn->dst);
898
d1010240
GP		 899 bt_accept_enqueue(parent, sk);
900
3d57dc68 901 l2cap_chan_add(conn, chan);
48454079 902
c9b66675 903 __set_chan_timer(chan, sk->sk_sndtimeo);
b62f328b 904
89bc500e 905 l2cap_state_change(chan, BT_CONNECTED);
b62f328b
VT		 906 parent->sk_data_ready(parent, 0);
907
b62f328b 908clean:
aa2ac881 909 release_sock(parent);
b62f328b
VT		 910}
911
f1cb9af5
VCG		 912static void l2cap_chan_ready(struct sock *sk)
913{
914 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
915 struct sock *parent = bt_sk(sk)->parent;
916
917 BT_DBG("sk %p, parent %p", sk, parent);
918
919 chan->conf_state = 0;
920 __clear_chan_timer(chan);
921
43f3dc41 922 l2cap_state_change(chan, BT_CONNECTED);
f1cb9af5
VCG		 923 sk->sk_state_change(sk);
924
925 if (parent)
926 parent->sk_data_ready(parent, 0);
927}
928
4e8402a3
MH		 929static void l2cap_conn_ready(struct l2cap_conn *conn)
930{
48454079 931 struct l2cap_chan *chan;
4e8402a3 932
79d554a6 933 BT_DBG("conn %p", conn);
4e8402a3 934
b62f328b
VT		 935 if (!conn->hcon->out && conn->hcon->type == LE_LINK)
936 l2cap_le_conn_ready(conn);
937
160dc6ac
VCG		 938 if (conn->hcon->out && conn->hcon->type == LE_LINK)
939 smp_conn_security(conn, conn->hcon->pending_sec_level);
940
3d57dc68 941 rcu_read_lock();
4e8402a3 942
3d57dc68 943 list_for_each_entry_rcu(chan, &conn->chan_l, list) {
48454079 944 struct sock *sk = chan->sk;
baa7e1fa 945
79d554a6 946 bh_lock_sock(sk);
4e8402a3 947
63128451 948 if (conn->hcon->type == LE_LINK) {
b501d6a1 949 if (smp_conn_security(conn, chan->sec_level))
f1cb9af5 950 l2cap_chan_ready(sk);
acd7d370 951
63128451 952 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 953 __clear_chan_timer(chan);
89bc500e 954 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 955 sk->sk_state_change(sk);
b501d6a1 956
89bc500e 957 } else if (chan->state == BT_CONNECT)
fc7f8a7e 958 l2cap_do_start(chan);
4e8402a3 959
79d554a6 960 bh_unlock_sock(sk);
4e8402a3 961 }
79d554a6 962
3d57dc68 963 rcu_read_unlock();
4e8402a3
MH		 964}
965
966/* Notify sockets that we cannot guaranty reliability anymore */
967static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
968{
48454079 969 struct l2cap_chan *chan;
4e8402a3
MH		 970
971 BT_DBG("conn %p", conn);
972
3d57dc68 973 rcu_read_lock();
4e8402a3 974
3d57dc68 975 list_for_each_entry_rcu(chan, &conn->chan_l, list) {
48454079 976 struct sock *sk = chan->sk;
baa7e1fa 977
ecf61bdb 978 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
4e8402a3
MH		 979 sk->sk_err = err;
980 }
981
3d57dc68 982 rcu_read_unlock();
4e8402a3
MH		 983}
984
f878fcad 985static void l2cap_info_timeout(struct work_struct *work)
4e8402a3 986{
f878fcad 987 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
030013d8 988 info_timer.work);
4e8402a3 989
984947dc 990 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 991 conn->info_ident = 0;
984947dc 992
4e8402a3
MH		 993 l2cap_conn_start(conn);
994}
995
5d3de7df
VCG		 996static void l2cap_conn_del(struct hci_conn *hcon, int err)
997{
998 struct l2cap_conn *conn = hcon->l2cap_data;
999 struct l2cap_chan *chan, *l;
1000 struct sock *sk;
1001
1002 if (!conn)
1003 return;
1004
1005 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1006
1007 kfree_skb(conn->rx_skb);
1008
1009 /* Kill channels */
1010 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
1011 sk = chan->sk;
aa2ac881 1012 lock_sock(sk);
5d3de7df 1013 l2cap_chan_del(chan, err);
aa2ac881 1014 release_sock(sk);
5d3de7df
VCG		 1015 chan->ops->close(chan->data);
1016 }
1017
73d80deb
LAD		 1018 hci_chan_del(conn->hchan);
1019
5d3de7df 1020 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
371fd835 1021 __cancel_delayed_work(&conn->info_timer);
5d3de7df 1022
d26a2345 1023 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) {
371fd835 1024 __cancel_delayed_work(&conn->security_timer);
8aab4757 1025 smp_chan_destroy(conn);
d26a2345 1026 }
5d3de7df
VCG		 1027
1028 hcon->l2cap_data = NULL;
1029 kfree(conn);
1030}
1031
6c9d42a1 1032static void security_timeout(struct work_struct *work)
5d3de7df 1033{
6c9d42a1
GP		 1034 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1035 security_timer.work);
5d3de7df
VCG		 1036
1037 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1038}
1039
1da177e4
LT		 1040static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1041{
0139418c 1042 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1043 struct hci_chan *hchan;
1da177e4 1044
0139418c 1045 if (conn || status)
1da177e4
LT		 1046 return conn;
1047
73d80deb
LAD		 1048 hchan = hci_chan_create(hcon);
1049 if (!hchan)
1050 return NULL;
1051
0139418c 1052 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
73d80deb
LAD		 1053 if (!conn) {
1054 hci_chan_del(hchan);
1da177e4 1055 return NULL;
73d80deb 1056 }
1da177e4
LT		 1057
1058 hcon->l2cap_data = conn;
1059 conn->hcon = hcon;
73d80deb 1060 conn->hchan = hchan;
1da177e4 1061
73d80deb 1062 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1063
acd7d370
VT		 1064 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
1065 conn->mtu = hcon->hdev->le_mtu;
1066 else
1067 conn->mtu = hcon->hdev->acl_mtu;
1068
1da177e4
LT		 1069 conn->src = &hcon->hdev->bdaddr;
1070 conn->dst = &hcon->dst;
1071
4e8402a3
MH		 1072 conn->feat_mask = 0;
1073
1da177e4 1074 spin_lock_init(&conn->lock);
baa7e1fa
GP		 1075
1076 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1077
5d3de7df 1078 if (hcon->type == LE_LINK)
6c9d42a1 1079 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
5d3de7df 1080 else
030013d8 1081 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
45054dc1 1082
9f5a0d7b 1083 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
2950f21a 1084
1da177e4
LT		 1085 return conn;
1086}
1087
1da177e4 1088/* ---- Socket interface ---- */
1da177e4
LT		 1089
1090/* Find socket with psm and source bdaddr.
1091 * Returns closest match.
1092 */
23691d75 1093static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4 1094{
23691d75 1095 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1096
23691d75 1097 read_lock(&chan_list_lock);
e0f0cb56 1098
23691d75
GP		 1099 list_for_each_entry(c, &chan_list, global_l) {
1100 struct sock *sk = c->sk;
fe4128e0 1101
89bc500e 1102 if (state && c->state != state)
1da177e4
LT		 1103 continue;
1104
23691d75 1105 if (c->psm == psm) {
1da177e4 1106 /* Exact match. */
23691d75 1107 if (!bacmp(&bt_sk(sk)->src, src)) {
a7567b20 1108 read_unlock(&chan_list_lock);
23691d75
GP		 1109 return c;
1110 }
1da177e4
LT		 1111
1112 /* Closest match */
1113 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
23691d75 1114 c1 = c;
1da177e4
LT		 1115 }
1116 }
1da177e4 1117
23691d75 1118 read_unlock(&chan_list_lock);
e0f0cb56 1119
23691d75 1120 return c1;
1da177e4
LT		 1121}
1122
03a00194 1123inline int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid, bdaddr_t *dst)
1da177e4 1124{
5d41ce1d 1125 struct sock *sk = chan->sk;
1da177e4 1126 bdaddr_t *src = &bt_sk(sk)->src;
1da177e4
LT		 1127 struct l2cap_conn *conn;
1128 struct hci_conn *hcon;
1129 struct hci_dev *hdev;
09ab6f4c 1130 __u8 auth_type;
44d0e48e 1131 int err;
1da177e4 1132
f29972de 1133 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
fe4128e0 1134 chan->psm);
1da177e4 1135
af05b30b
GP		 1136 hdev = hci_get_route(dst, src);
1137 if (!hdev)
1da177e4
LT		 1138 return -EHOSTUNREACH;
1139
09fd0de5 1140 hci_dev_lock(hdev);
1da177e4 1141
03a00194
GP		 1142 lock_sock(sk);
1143
1144 /* PSM must be odd and lsb of upper byte must be 0 */
1145 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1146 chan->chan_type != L2CAP_CHAN_RAW) {
1147 err = -EINVAL;
1148 goto done;
1149 }
1150
1151 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1152 err = -EINVAL;
1153 goto done;
1154 }
1155
1156 switch (chan->mode) {
1157 case L2CAP_MODE_BASIC:
1158 break;
1159 case L2CAP_MODE_ERTM:
1160 case L2CAP_MODE_STREAMING:
1161 if (!disable_ertm)
1162 break;
1163 /* fall through */
1164 default:
1165 err = -ENOTSUPP;
1166 goto done;
1167 }
1168
1169 switch (sk->sk_state) {
1170 case BT_CONNECT:
1171 case BT_CONNECT2:
1172 case BT_CONFIG:
1173 /* Already connecting */
1174 err = 0;
1175 goto done;
1176
1177 case BT_CONNECTED:
1178 /* Already connected */
1179 err = -EISCONN;
1180 goto done;
1181
1182 case BT_OPEN:
1183 case BT_BOUND:
1184 /* Can connect */
1185 break;
1186
1187 default:
1188 err = -EBADFD;
1189 goto done;
1190 }
1191
1192 /* Set destination address and psm */
1193 bacpy(&bt_sk(sk)->dst, src);
1194 chan->psm = psm;
1195 chan->dcid = cid;
1196
4343478f 1197 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1198
fe4128e0 1199 if (chan->dcid == L2CAP_CID_LE_DATA)
acd7d370 1200 hcon = hci_connect(hdev, LE_LINK, dst,
4343478f 1201 chan->sec_level, auth_type);
acd7d370
VT		 1202 else
1203 hcon = hci_connect(hdev, ACL_LINK, dst,
4343478f 1204 chan->sec_level, auth_type);
acd7d370 1205
30e76272
VT		 1206 if (IS_ERR(hcon)) {
1207 err = PTR_ERR(hcon);
1da177e4 1208 goto done;
30e76272 1209 }
1da177e4
LT		 1210
1211 conn = l2cap_conn_add(hcon, 0);
1212 if (!conn) {
1213 hci_conn_put(hcon);
30e76272 1214 err = -ENOMEM;
1da177e4
LT		 1215 goto done;
1216 }
1217
1da177e4
LT		 1218 /* Update source addr of the socket */
1219 bacpy(src, conn->src);
1220
48454079
GP		 1221 l2cap_chan_add(conn, chan);
1222
89bc500e 1223 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1224 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1225
1226 if (hcon->state == BT_CONNECTED) {
715ec005 1227 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1228 __clear_chan_timer(chan);
d45fc423 1229 if (l2cap_chan_check_security(chan))
89bc500e 1230 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1231 } else
fc7f8a7e 1232 l2cap_do_start(chan);
1da177e4
LT		 1233 }
1234
30e76272
VT		 1235 err = 0;
1236
1da177e4 1237done:
09fd0de5 1238 hci_dev_unlock(hdev);
1da177e4
LT		 1239 hci_dev_put(hdev);
1240 return err;
1241}
1242
dcba0dba 1243int __l2cap_wait_ack(struct sock *sk)
6161c038 1244{
8c1d787b 1245 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1246 DECLARE_WAITQUEUE(wait, current);
1247 int err = 0;
1248 int timeo = HZ/5;
1249
2b0b05dd 1250 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1251 set_current_state(TASK_INTERRUPTIBLE);
1252 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1253 if (!timeo)
1254 timeo = HZ/5;
1255
1256 if (signal_pending(current)) {
1257 err = sock_intr_errno(timeo);
1258 break;
1259 }
1260
1261 release_sock(sk);
1262 timeo = schedule_timeout(timeo);
1263 lock_sock(sk);
a71a0cf4 1264 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1265
1266 err = sock_error(sk);
1267 if (err)
1268 break;
1269 }
1270 set_current_state(TASK_RUNNING);
2b0b05dd 1271 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1272 return err;
1273}
1274
721c4181 1275static void l2cap_monitor_timeout(struct work_struct *work)
e90bac06 1276{
721c4181
GP		 1277 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1278 monitor_timer.work);
525cd185 1279 struct sock *sk = chan->sk;
e90bac06 1280
525cd185 1281 BT_DBG("chan %p", chan);
0e98958d 1282
721c4181 1283 lock_sock(sk);
2c03a7a4 1284 if (chan->retry_count >= chan->remote_max_tx) {
8c1d787b 1285 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
721c4181 1286 release_sock(sk);
e90bac06
GP		 1287 return;
1288 }
1289
6a026610 1290 chan->retry_count++;
1a09bcb9 1291 __set_monitor_timer(chan);
e90bac06 1292
525cd185 1293 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
721c4181 1294 release_sock(sk);
e90bac06
GP		 1295}
1296
721c4181 1297static void l2cap_retrans_timeout(struct work_struct *work)
e90bac06 1298{
721c4181
GP		 1299 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1300 retrans_timer.work);
525cd185 1301 struct sock *sk = chan->sk;
e90bac06 1302
49208c9c 1303 BT_DBG("chan %p", chan);
0e98958d 1304
721c4181 1305 lock_sock(sk);
6a026610 1306 chan->retry_count = 1;
1a09bcb9 1307 __set_monitor_timer(chan);
e90bac06 1308
e2ab4353 1309 set_bit(CONN_WAIT_F, &chan->conn_state);
e90bac06 1310
525cd185 1311 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
721c4181 1312 release_sock(sk);
e90bac06
GP		 1313}
1314
42e5c802 1315static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
1da177e4 1316{
1c2acffb 1317 struct sk_buff *skb;
1da177e4 1318
58d35f87 1319 while ((skb = skb_peek(&chan->tx_q)) &&
6a026610 1320 chan->unacked_frames) {
42e5c802 1321 if (bt_cb(skb)->tx_seq == chan->expected_ack_seq)
1c2acffb 1322 break;
1da177e4 1323
58d35f87 1324 skb = skb_dequeue(&chan->tx_q);
1c2acffb 1325 kfree_skb(skb);
1da177e4 1326
6a026610 1327 chan->unacked_frames--;
1c2acffb 1328 }
1da177e4 1329
6a026610 1330 if (!chan->unacked_frames)
1a09bcb9 1331 __clear_retrans_timer(chan);
1c2acffb 1332}
1da177e4 1333
67c9e840 1334static void l2cap_streaming_send(struct l2cap_chan *chan)
6840ed07 1335{
ccbb84af 1336 struct sk_buff *skb;
88843ab0
AE		 1337 u32 control;
1338 u16 fcs;
6840ed07 1339
58d35f87 1340 while ((skb = skb_dequeue(&chan->tx_q))) {
88843ab0 1341 control = __get_control(chan, skb->data + L2CAP_HDR_SIZE);
fb45de7d 1342 control |= __set_txseq(chan, chan->next_tx_seq);
88843ab0 1343 __put_control(chan, control, skb->data + L2CAP_HDR_SIZE);
6840ed07 1344
47d1ec61 1345 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1346 fcs = crc16(0, (u8 *)skb->data,
1347 skb->len - L2CAP_FCS_SIZE);
1348 put_unaligned_le16(fcs,
1349 skb->data + skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 1350 }
1351
4343478f 1352 l2cap_do_send(chan, skb);
6840ed07 1353
836be934 1354 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
6840ed07 1355 }
6840ed07
GP		 1356}
1357
fb45de7d 1358static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 1359{
8f17154f 1360 struct sk_buff *skb, *tx_skb;
88843ab0
AE		 1361 u16 fcs;
1362 u32 control;
8f17154f 1363
58d35f87 1364 skb = skb_peek(&chan->tx_q);
f11d676d
GP		 1365 if (!skb)
1366 return;
8f17154f 1367
d1726b6d 1368 while (bt_cb(skb)->tx_seq != tx_seq) {
58d35f87 1369 if (skb_queue_is_last(&chan->tx_q, skb))
f11d676d 1370 return;
8f17154f 1371
d1726b6d
SJ		 1372 skb = skb_queue_next(&chan->tx_q, skb);
1373 }
8f17154f 1374
2c03a7a4
GP		 1375 if (chan->remote_max_tx &&
1376 bt_cb(skb)->retries == chan->remote_max_tx) {
8c1d787b 1377 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
f11d676d
GP		 1378 return;
1379 }
1380
1381 tx_skb = skb_clone(skb, GFP_ATOMIC);
1382 bt_cb(skb)->retries++;
88843ab0
AE		 1383
1384 control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
7e0ef6ee 1385 control &= __get_sar_mask(chan);
3cb123d1 1386
e2ab4353 1387 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
03f6715d 1388 control |= __set_ctrl_final(chan);
95ffa978 1389
0b209fae 1390 control |= __set_reqseq(chan, chan->buffer_seq);
fb45de7d 1391 control |= __set_txseq(chan, tx_seq);
3cb123d1 1392
88843ab0 1393 __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
f11d676d 1394
47d1ec61 1395 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1396 fcs = crc16(0, (u8 *)tx_skb->data,
1397 tx_skb->len - L2CAP_FCS_SIZE);
1398 put_unaligned_le16(fcs,
1399 tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE);
f11d676d
GP		 1400 }
1401
4343478f 1402 l2cap_do_send(chan, tx_skb);
8f17154f
GP		 1403}
1404
67c9e840 1405static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1406{
1407 struct sk_buff *skb, *tx_skb;
88843ab0
AE		 1408 u16 fcs;
1409 u32 control;
9a9c6a34 1410 int nsent = 0;
1c2acffb 1411
89bc500e 1412 if (chan->state != BT_CONNECTED)
c13ffa62 1413 return -ENOTCONN;
e90bac06 1414
58d35f87 1415 while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
1c2acffb 1416
2c03a7a4
GP		 1417 if (chan->remote_max_tx &&
1418 bt_cb(skb)->retries == chan->remote_max_tx) {
8c1d787b 1419 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
e90bac06
GP		 1420 break;
1421 }
1422
e420aba3
AE		 1423 tx_skb = skb_clone(skb, GFP_ATOMIC);
1424
e90bac06
GP		 1425 bt_cb(skb)->retries++;
1426
88843ab0 1427 control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
7e0ef6ee 1428 control &= __get_sar_mask(chan);
95ffa978 1429
e2ab4353 1430 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
03f6715d 1431 control |= __set_ctrl_final(chan);
e2ab4353 1432
0b209fae 1433 control |= __set_reqseq(chan, chan->buffer_seq);
fb45de7d 1434 control |= __set_txseq(chan, chan->next_tx_seq);
1c2acffb 1435
88843ab0 1436 __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
e90bac06 1437
47d1ec61 1438 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1439 fcs = crc16(0, (u8 *)skb->data,
1440 tx_skb->len - L2CAP_FCS_SIZE);
1441 put_unaligned_le16(fcs, skb->data +
1442 tx_skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 1443 }
1444
4343478f 1445 l2cap_do_send(chan, tx_skb);
9a9c6a34 1446
1a09bcb9 1447 __set_retrans_timer(chan);
1c2acffb 1448
42e5c802 1449 bt_cb(skb)->tx_seq = chan->next_tx_seq;
836be934
AE		 1450
1451 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1c2acffb 1452
23e9fde2 1453 if (bt_cb(skb)->retries == 1)
6a026610 1454 chan->unacked_frames++;
23e9fde2 1455
6a026610 1456 chan->frames_sent++;
1c2acffb 1457
58d35f87
GP		 1458 if (skb_queue_is_last(&chan->tx_q, skb))
1459 chan->tx_send_head = NULL;
1c2acffb 1460 else
58d35f87 1461 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
9e917af1
GP		 1462
1463 nsent++;
1c2acffb
GP		 1464 }
1465
9e917af1
GP		 1466 return nsent;
1467}
1468
525cd185 1469static int l2cap_retransmit_frames(struct l2cap_chan *chan)
dfc909be 1470{
dfc909be
GP		 1471 int ret;
1472
58d35f87
GP		 1473 if (!skb_queue_empty(&chan->tx_q))
1474 chan->tx_send_head = chan->tx_q.next;
dfc909be 1475
42e5c802 1476 chan->next_tx_seq = chan->expected_ack_seq;
525cd185 1477 ret = l2cap_ertm_send(chan);
dfc909be
GP		 1478 return ret;
1479}
1480
525cd185 1481static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 1482{
88843ab0 1483 u32 control = 0;
9e917af1 1484
0b209fae 1485 control |= __set_reqseq(chan, chan->buffer_seq);
9e917af1 1486
e2ab4353 1487 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 1488 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
e2ab4353 1489 set_bit(CONN_RNR_SENT, &chan->conn_state);
525cd185 1490 l2cap_send_sframe(chan, control);
9a9c6a34 1491 return;
9e917af1 1492 }
dfc909be 1493
525cd185 1494 if (l2cap_ertm_send(chan) > 0)
dfc909be
GP		 1495 return;
1496
ab784b73 1497 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 1498 l2cap_send_sframe(chan, control);
1c2acffb
GP		 1499}
1500
525cd185 1501static void l2cap_send_srejtail(struct l2cap_chan *chan)
99b0d4b7
GP		 1502{
1503 struct srej_list *tail;
88843ab0 1504 u32 control;
99b0d4b7 1505
ab784b73 1506 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
03f6715d 1507 control |= __set_ctrl_final(chan);
99b0d4b7 1508
39d5a3ee 1509 tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
0b209fae 1510 control |= __set_reqseq(chan, tail->tx_seq);
99b0d4b7 1511
525cd185 1512 l2cap_send_sframe(chan, control);
99b0d4b7
GP		 1513}
1514
1c2acffb
GP		 1515static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1516{
8c1d787b 1517 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
1c2acffb
GP		 1518 struct sk_buff **frag;
1519 int err, sent = 0;
1da177e4 1520
59203a21 1521 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1522 return -EFAULT;
1da177e4
LT		 1523
1524 sent += count;
1525 len -= count;
1526
1527 /* Continuation fragments (no L2CAP header) */
1528 frag = &skb_shinfo(skb)->frag_list;
1529 while (len) {
1530 count = min_t(unsigned int, conn->mtu, len);
1531
1532 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1533 if (!*frag)
0175d629 1534 return err;
1c2acffb
GP		 1535 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1536 return -EFAULT;
1da177e4 1537
5e59b791
LAD		 1538 (*frag)->priority = skb->priority;
1539
1da177e4
LT		 1540 sent += count;
1541 len -= count;
1542
1543 frag = &(*frag)->next;
1544 }
1da177e4
LT		 1545
1546 return sent;
1c2acffb 1547}
1da177e4 1548
5e59b791
LAD		 1549static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
1550 struct msghdr *msg, size_t len,
1551 u32 priority)
1c2acffb 1552{
fe4128e0 1553 struct sock *sk = chan->sk;
8c1d787b 1554 struct l2cap_conn *conn = chan->conn;
1c2acffb 1555 struct sk_buff *skb;
03a51213 1556 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 1557 struct l2cap_hdr *lh;
1558
5e59b791 1559 BT_DBG("sk %p len %d priority %u", sk, (int)len, priority);
1c2acffb
GP		 1560
1561 count = min_t(unsigned int, (conn->mtu - hlen), len);
1562 skb = bt_skb_send_alloc(sk, count + hlen,
1563 msg->msg_flags & MSG_DONTWAIT, &err);
1564 if (!skb)
0175d629 1565 return ERR_PTR(err);
1c2acffb 1566
5e59b791
LAD		 1567 skb->priority = priority;
1568
1c2acffb
GP		 1569 /* Create L2CAP header */
1570 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1571 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 1572 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
fe4128e0 1573 put_unaligned_le16(chan->psm, skb_put(skb, 2));
1c2acffb
GP		 1574
1575 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1576 if (unlikely(err < 0)) {
1577 kfree_skb(skb);
1578 return ERR_PTR(err);
1579 }
1580 return skb;
1581}
1582
5e59b791
LAD		 1583static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
1584 struct msghdr *msg, size_t len,
1585 u32 priority)
1c2acffb 1586{
fe4128e0 1587 struct sock *sk = chan->sk;
8c1d787b 1588 struct l2cap_conn *conn = chan->conn;
1c2acffb
GP		 1589 struct sk_buff *skb;
1590 int err, count, hlen = L2CAP_HDR_SIZE;
1591 struct l2cap_hdr *lh;
1592
1593 BT_DBG("sk %p len %d", sk, (int)len);
1594
1595 count = min_t(unsigned int, (conn->mtu - hlen), len);
1596 skb = bt_skb_send_alloc(sk, count + hlen,
1597 msg->msg_flags & MSG_DONTWAIT, &err);
1598 if (!skb)
0175d629 1599 return ERR_PTR(err);
1c2acffb 1600
5e59b791
LAD		 1601 skb->priority = priority;
1602
1c2acffb
GP		 1603 /* Create L2CAP header */
1604 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1605 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb
GP		 1606 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1607
1608 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1609 if (unlikely(err < 0)) {
1610 kfree_skb(skb);
1611 return ERR_PTR(err);
1612 }
1613 return skb;
1614}
1615
ab0ff76d
LAD		 1616static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
1617 struct msghdr *msg, size_t len,
88843ab0 1618 u32 control, u16 sdulen)
1c2acffb 1619{
47d1ec61 1620 struct sock *sk = chan->sk;
8c1d787b 1621 struct l2cap_conn *conn = chan->conn;
1c2acffb 1622 struct sk_buff *skb;
e4ca6d98 1623 int err, count, hlen;
1c2acffb
GP		 1624 struct l2cap_hdr *lh;
1625
1626 BT_DBG("sk %p len %d", sk, (int)len);
1627
0ee0d208
GP		 1628 if (!conn)
1629 return ERR_PTR(-ENOTCONN);
1630
e4ca6d98
AE		 1631 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1632 hlen = L2CAP_EXT_HDR_SIZE;
1633 else
1634 hlen = L2CAP_ENH_HDR_SIZE;
1635
c74e560c 1636 if (sdulen)
03a51213 1637 hlen += L2CAP_SDULEN_SIZE;
c74e560c 1638
47d1ec61 1639 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 1640 hlen += L2CAP_FCS_SIZE;
fcc203c3 1641
1c2acffb
GP		 1642 count = min_t(unsigned int, (conn->mtu - hlen), len);
1643 skb = bt_skb_send_alloc(sk, count + hlen,
1644 msg->msg_flags & MSG_DONTWAIT, &err);
1645 if (!skb)
0175d629 1646 return ERR_PTR(err);
1c2acffb
GP		 1647
1648 /* Create L2CAP header */
1649 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1650 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 1651 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0
AE		 1652
1653 __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
1654
c74e560c 1655 if (sdulen)
03a51213 1656 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb
GP		 1657
1658 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1659 if (unlikely(err < 0)) {
1660 kfree_skb(skb);
1661 return ERR_PTR(err);
1662 }
e90bac06 1663
47d1ec61 1664 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 1665 put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3 1666
e90bac06 1667 bt_cb(skb)->retries = 0;
1c2acffb 1668 return skb;
1da177e4
LT		 1669}
1670
67c9e840 1671static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
c74e560c 1672{
c74e560c
GP		 1673 struct sk_buff *skb;
1674 struct sk_buff_head sar_queue;
88843ab0 1675 u32 control;
c74e560c
GP		 1676 size_t size = 0;
1677
ff12fd64 1678 skb_queue_head_init(&sar_queue);
7e0ef6ee 1679 control = __set_ctrl_sar(chan, L2CAP_SAR_START);
47d1ec61 1680 skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len);
c74e560c
GP		 1681 if (IS_ERR(skb))
1682 return PTR_ERR(skb);
1683
1684 __skb_queue_tail(&sar_queue, skb);
2c03a7a4
GP		 1685 len -= chan->remote_mps;
1686 size += chan->remote_mps;
c74e560c
GP		 1687
1688 while (len > 0) {
1689 size_t buflen;
1690
2c03a7a4 1691 if (len > chan->remote_mps) {
7e0ef6ee 1692 control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE);
2c03a7a4 1693 buflen = chan->remote_mps;
c74e560c 1694 } else {
7e0ef6ee 1695 control = __set_ctrl_sar(chan, L2CAP_SAR_END);
c74e560c
GP		 1696 buflen = len;
1697 }
1698
47d1ec61 1699 skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0);
c74e560c
GP		 1700 if (IS_ERR(skb)) {
1701 skb_queue_purge(&sar_queue);
1702 return PTR_ERR(skb);
1703 }
1704
1705 __skb_queue_tail(&sar_queue, skb);
1706 len -= buflen;
1707 size += buflen;
c74e560c 1708 }
58d35f87
GP		 1709 skb_queue_splice_tail(&sar_queue, &chan->tx_q);
1710 if (chan->tx_send_head == NULL)
1711 chan->tx_send_head = sar_queue.next;
c74e560c
GP		 1712
1713 return size;
1714}
1715
5e59b791
LAD		 1716int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
1717 u32 priority)
9a91a04a 1718{
9a91a04a 1719 struct sk_buff *skb;
88843ab0 1720 u32 control;
9a91a04a
GP		 1721 int err;
1722
1723 /* Connectionless channel */
715ec005 1724 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 1725 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 1726 if (IS_ERR(skb))
1727 return PTR_ERR(skb);
1728
1729 l2cap_do_send(chan, skb);
1730 return len;
1731 }
1732
1733 switch (chan->mode) {
1734 case L2CAP_MODE_BASIC:
1735 /* Check outgoing MTU */
1736 if (len > chan->omtu)
1737 return -EMSGSIZE;
1738
1739 /* Create a basic PDU */
5e59b791 1740 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 1741 if (IS_ERR(skb))
1742 return PTR_ERR(skb);
1743
1744 l2cap_do_send(chan, skb);
1745 err = len;
1746 break;
1747
1748 case L2CAP_MODE_ERTM:
1749 case L2CAP_MODE_STREAMING:
1750 /* Entire SDU fits into one PDU */
1751 if (len <= chan->remote_mps) {
7e0ef6ee 1752 control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED);
9a91a04a
GP		 1753 skb = l2cap_create_iframe_pdu(chan, msg, len, control,
1754 0);
1755 if (IS_ERR(skb))
1756 return PTR_ERR(skb);
1757
1758 __skb_queue_tail(&chan->tx_q, skb);
1759
1760 if (chan->tx_send_head == NULL)
1761 chan->tx_send_head = skb;
1762
1763 } else {
1764 /* Segment SDU into multiples PDUs */
1765 err = l2cap_sar_segment_sdu(chan, msg, len);
1766 if (err < 0)
1767 return err;
1768 }
1769
1770 if (chan->mode == L2CAP_MODE_STREAMING) {
1771 l2cap_streaming_send(chan);
1772 err = len;
1773 break;
1774 }
1775
e2ab4353
GP		 1776 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
1777 test_bit(CONN_WAIT_F, &chan->conn_state)) {
9a91a04a
GP		 1778 err = len;
1779 break;
1780 }
1781
1782 err = l2cap_ertm_send(chan);
1783 if (err >= 0)
1784 err = len;
1785
1786 break;
1787
1788 default:
1789 BT_DBG("bad state %1.1x", chan->mode);
1790 err = -EBADFD;
1791 }
1792
1793 return err;
1794}
1795
1da177e4
LT		 1796/* Copy frame to all raw sockets on that connection */
1797static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
1798{
1da177e4 1799 struct sk_buff *nskb;
48454079 1800 struct l2cap_chan *chan;
1da177e4
LT		 1801
1802 BT_DBG("conn %p", conn);
1803
3d57dc68
GP		 1804 rcu_read_lock();
1805
1806 list_for_each_entry_rcu(chan, &conn->chan_l, list) {
48454079 1807 struct sock *sk = chan->sk;
715ec005 1808 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 1809 continue;
1810
1811 /* Don't send frame to the socket it came from */
1812 if (skb->sk == sk)
1813 continue;
af05b30b
GP		 1814 nskb = skb_clone(skb, GFP_ATOMIC);
1815 if (!nskb)
1da177e4
LT		 1816 continue;
1817
23070494 1818 if (chan->ops->recv(chan->data, nskb))
1da177e4
LT		 1819 kfree_skb(nskb);
1820 }
3d57dc68
GP		 1821
1822 rcu_read_unlock();
1da177e4
LT		 1823}
1824
1825/* ---- L2CAP signalling commands ---- */
1826static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
1827 u8 code, u8 ident, u16 dlen, void *data)
1828{
1829 struct sk_buff *skb, **frag;
1830 struct l2cap_cmd_hdr *cmd;
1831 struct l2cap_hdr *lh;
1832 int len, count;
1833
af05b30b
GP		 1834 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
1835 conn, code, ident, dlen);
1da177e4
LT		 1836
1837 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
1838 count = min_t(unsigned int, conn->mtu, len);
1839
1840 skb = bt_skb_alloc(count, GFP_ATOMIC);
1841 if (!skb)
1842 return NULL;
1843
1844 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 1845 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 1846
1847 if (conn->hcon->type == LE_LINK)
1848 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
1849 else
1850 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 1851
1852 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
1853 cmd->code = code;
1854 cmd->ident = ident;
aca3192c 1855 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 1856
1857 if (dlen) {
1858 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
1859 memcpy(skb_put(skb, count), data, count);
1860 data += count;
1861 }
1862
1863 len -= skb->len;
1864
1865 /* Continuation fragments (no L2CAP header) */
1866 frag = &skb_shinfo(skb)->frag_list;
1867 while (len) {
1868 count = min_t(unsigned int, conn->mtu, len);
1869
1870 *frag = bt_skb_alloc(count, GFP_ATOMIC);
1871 if (!*frag)
1872 goto fail;
1873
1874 memcpy(skb_put(*frag, count), data, count);
1875
1876 len -= count;
1877 data += count;
1878
1879 frag = &(*frag)->next;
1880 }
1881
1882 return skb;
1883
1884fail:
1885 kfree_skb(skb);
1886 return NULL;
1887}
1888
1889static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
1890{
1891 struct l2cap_conf_opt *opt = *ptr;
1892 int len;
1893
1894 len = L2CAP_CONF_OPT_SIZE + opt->len;
1895 *ptr += len;
1896
1897 *type = opt->type;
1898 *olen = opt->len;
1899
1900 switch (opt->len) {
1901 case 1:
1902 *val = *((u8 *) opt->val);
1903 break;
1904
1905 case 2:
bfaaeb3e 1906 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 1907 break;
1908
1909 case 4:
bfaaeb3e 1910 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 1911 break;
1912
1913 default:
1914 *val = (unsigned long) opt->val;
1915 break;
1916 }
1917
1918 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
1919 return len;
1920}
1921
1da177e4
LT		 1922static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
1923{
1924 struct l2cap_conf_opt *opt = *ptr;
1925
1926 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
1927
1928 opt->type = type;
1929 opt->len = len;
1930
1931 switch (len) {
1932 case 1:
1933 *((u8 *) opt->val) = val;
1934 break;
1935
1936 case 2:
4f8b691c 1937 put_unaligned_le16(val, opt->val);
1da177e4
LT		 1938 break;
1939
1940 case 4:
4f8b691c 1941 put_unaligned_le32(val, opt->val);
1da177e4
LT		 1942 break;
1943
1944 default:
1945 memcpy(opt->val, (void *) val, len);
1946 break;
1947 }
1948
1949 *ptr += L2CAP_CONF_OPT_SIZE + len;
1950}
1951
f89cef09
AE		 1952static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
1953{
1954 struct l2cap_conf_efs efs;
1955
1ec918ce 1956 switch (chan->mode) {
f89cef09
AE		 1957 case L2CAP_MODE_ERTM:
1958 efs.id = chan->local_id;
1959 efs.stype = chan->local_stype;
1960 efs.msdu = cpu_to_le16(chan->local_msdu);
1961 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
1962 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
1963 efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO);
1964 break;
1965
1966 case L2CAP_MODE_STREAMING:
1967 efs.id = 1;
1968 efs.stype = L2CAP_SERV_BESTEFFORT;
1969 efs.msdu = cpu_to_le16(chan->local_msdu);
1970 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
1971 efs.acc_lat = 0;
1972 efs.flush_to = 0;
1973 break;
1974
1975 default:
1976 return;
1977 }
1978
1979 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
1980 (unsigned long) &efs);
1981}
1982
721c4181 1983static void l2cap_ack_timeout(struct work_struct *work)
c1b4f43b 1984{
721c4181
GP		 1985 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1986 ack_timer.work);
c1b4f43b 1987
721c4181 1988 lock_sock(chan->sk);
525cd185 1989 l2cap_send_ack(chan);
721c4181 1990 release_sock(chan->sk);
c1b4f43b
GP		 1991}
1992
525cd185 1993static inline void l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 1994{
42e5c802 1995 chan->expected_ack_seq = 0;
6a026610 1996 chan->unacked_frames = 0;
42e5c802 1997 chan->buffer_seq = 0;
6a026610
GP		 1998 chan->num_acked = 0;
1999 chan->frames_sent = 0;
0565c1c2 2000
721c4181
GP		 2001 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2002 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2003 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 2004
f1c6775b 2005 skb_queue_head_init(&chan->srej_q);
1890d36b 2006
39d5a3ee 2007 INIT_LIST_HEAD(&chan->srej_l);
0565c1c2
GP		 2008}
2009
f2fcfcd6
GP		 2010static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2011{
2012 switch (mode) {
2013 case L2CAP_MODE_STREAMING:
2014 case L2CAP_MODE_ERTM:
2015 if (l2cap_mode_supported(mode, remote_feat_mask))
2016 return mode;
2017 /* fall through */
2018 default:
2019 return L2CAP_MODE_BASIC;
2020 }
2021}
2022
6327eb98
AE		 2023static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2024{
2025 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2026}
2027
f89cef09
AE		 2028static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2029{
2030 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2031}
2032
6327eb98
AE		 2033static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
2034{
2035 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
836be934 2036 __l2cap_ews_supported(chan)) {
6327eb98
AE		 2037 /* use extended control field */
2038 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 2039 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
2040 } else {
6327eb98
AE		 2041 chan->tx_win = min_t(u16, chan->tx_win,
2042 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 2043 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
2044 }
6327eb98
AE		 2045}
2046
710f9b0a 2047static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2048{
1da177e4 2049 struct l2cap_conf_req *req = data;
0c1bc5c6 2050 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 2051 void *ptr = req->data;
c8f79162 2052 u16 size;
1da177e4 2053
49208c9c 2054 BT_DBG("chan %p", chan);
1da177e4 2055
73ffa904 2056 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 2057 goto done;
2058
0c1bc5c6 2059 switch (chan->mode) {
f2fcfcd6
GP		 2060 case L2CAP_MODE_STREAMING:
2061 case L2CAP_MODE_ERTM:
c1360a1c 2062 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 2063 break;
85eb53c6 2064
f89cef09
AE		 2065 if (__l2cap_efs_supported(chan))
2066 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2067
2ba13ed6 2068 /* fall through */
f2fcfcd6 2069 default:
8c1d787b 2070 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 2071 break;
2072 }
2073
2074done:
0c1bc5c6
GP		 2075 if (chan->imtu != L2CAP_DEFAULT_MTU)
2076 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 2077
0c1bc5c6 2078 switch (chan->mode) {
65c7c491 2079 case L2CAP_MODE_BASIC:
8c1d787b
GP		 2080 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2081 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 2082 break;
2083
62547752
GP		 2084 rfc.mode = L2CAP_MODE_BASIC;
2085 rfc.txwin_size = 0;
2086 rfc.max_transmit = 0;
2087 rfc.retrans_timeout = 0;
2088 rfc.monitor_timeout = 0;
2089 rfc.max_pdu_size = 0;
2090
63406504
GP		 2091 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2092 (unsigned long) &rfc);
65c7c491
MH		 2093 break;
2094
2095 case L2CAP_MODE_ERTM:
2096 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 2097 rfc.max_transmit = chan->max_tx;
f2fcfcd6
GP		 2098 rfc.retrans_timeout = 0;
2099 rfc.monitor_timeout = 0;
c8f79162
AE		 2100
2101 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2102 L2CAP_EXT_HDR_SIZE -
2103 L2CAP_SDULEN_SIZE -
2104 L2CAP_FCS_SIZE);
2105 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 2106
6327eb98
AE		 2107 l2cap_txwin_setup(chan);
2108
2109 rfc.txwin_size = min_t(u16, chan->tx_win,
2110 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 2111
63406504
GP		 2112 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2113 (unsigned long) &rfc);
2114
f89cef09
AE		 2115 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2116 l2cap_add_opt_efs(&ptr, chan);
2117
8c1d787b 2118 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2119 break;
2120
47d1ec61 2121 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2122 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2123 chan->fcs = L2CAP_FCS_NONE;
2124 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2125 }
6327eb98
AE		 2126
2127 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2128 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2129 chan->tx_win);
f2fcfcd6
GP		 2130 break;
2131
2132 case L2CAP_MODE_STREAMING:
2133 rfc.mode = L2CAP_MODE_STREAMING;
2134 rfc.txwin_size = 0;
2135 rfc.max_transmit = 0;
2136 rfc.retrans_timeout = 0;
2137 rfc.monitor_timeout = 0;
c8f79162
AE		 2138
2139 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2140 L2CAP_EXT_HDR_SIZE -
2141 L2CAP_SDULEN_SIZE -
2142 L2CAP_FCS_SIZE);
2143 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 2144
63406504
GP		 2145 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2146 (unsigned long) &rfc);
2147
f89cef09
AE		 2148 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2149 l2cap_add_opt_efs(&ptr, chan);
2150
8c1d787b 2151 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2152 break;
2153
47d1ec61 2154 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2155 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2156 chan->fcs = L2CAP_FCS_NONE;
2157 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2158 }
65c7c491
MH		 2159 break;
2160 }
1da177e4 2161
fe4128e0 2162 req->dcid = cpu_to_le16(chan->dcid);
aca3192c 2163 req->flags = cpu_to_le16(0);
1da177e4
LT		 2164
2165 return ptr - data;
2166}
2167
73ffa904 2168static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2169{
5dee9e7c
MH		 2170 struct l2cap_conf_rsp *rsp = data;
2171 void *ptr = rsp->data;
73ffa904
GP		 2172 void *req = chan->conf_req;
2173 int len = chan->conf_len;
5dee9e7c
MH		 2174 int type, hint, olen;
2175 unsigned long val;
6464f35f 2176 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 2177 struct l2cap_conf_efs efs;
2178 u8 remote_efs = 0;
861d6882 2179 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2180 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 2181 u16 size;
1da177e4 2182
73ffa904 2183 BT_DBG("chan %p", chan);
820ae1b8 2184
5dee9e7c
MH		 2185 while (len >= L2CAP_CONF_OPT_SIZE) {
2186 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2187
589d2746 2188 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2189 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2190
2191 switch (type) {
2192 case L2CAP_CONF_MTU:
861d6882 2193 mtu = val;
5dee9e7c
MH		 2194 break;
2195
2196 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2197 chan->flush_to = val;
5dee9e7c
MH		 2198 break;
2199
2200 case L2CAP_CONF_QOS:
2201 break;
2202
6464f35f
MH		 2203 case L2CAP_CONF_RFC:
2204 if (olen == sizeof(rfc))
2205 memcpy(&rfc, (void *) val, olen);
2206 break;
2207
fcc203c3
GP		 2208 case L2CAP_CONF_FCS:
2209 if (val == L2CAP_FCS_NONE)
c1360a1c 2210 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 2211 break;
fcc203c3 2212
42dceae2
AE		 2213 case L2CAP_CONF_EFS:
2214 remote_efs = 1;
2215 if (olen == sizeof(efs))
2216 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 2217 break;
2218
6327eb98
AE		 2219 case L2CAP_CONF_EWS:
2220 if (!enable_hs)
2221 return -ECONNREFUSED;
fcc203c3 2222
6327eb98
AE		 2223 set_bit(FLAG_EXT_CTRL, &chan->flags);
2224 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 2225 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 2226 chan->remote_tx_win = val;
fcc203c3
GP		 2227 break;
2228
5dee9e7c
MH		 2229 default:
2230 if (hint)
2231 break;
2232
2233 result = L2CAP_CONF_UNKNOWN;
2234 *((u8 *) ptr++) = type;
2235 break;
2236 }
2237 }
2238
73ffa904 2239 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 2240 goto done;
2241
0c1bc5c6 2242 switch (chan->mode) {
f2fcfcd6
GP		 2243 case L2CAP_MODE_STREAMING:
2244 case L2CAP_MODE_ERTM:
c1360a1c 2245 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 2246 chan->mode = l2cap_select_mode(rfc.mode,
8c1d787b 2247 chan->conn->feat_mask);
85eb53c6
GP		 2248 break;
2249 }
2250
42dceae2
AE		 2251 if (remote_efs) {
2252 if (__l2cap_efs_supported(chan))
2253 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2254 else
2255 return -ECONNREFUSED;
2256 }
2257
0c1bc5c6 2258 if (chan->mode != rfc.mode)
f2fcfcd6 2259 return -ECONNREFUSED;
742e519b 2260
f2fcfcd6 2261 break;
f2fcfcd6
GP		 2262 }
2263
2264done:
0c1bc5c6 2265 if (chan->mode != rfc.mode) {
f2fcfcd6 2266 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2267 rfc.mode = chan->mode;
f2fcfcd6 2268
73ffa904 2269 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 2270 return -ECONNREFUSED;
2271
2272 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2273 sizeof(rfc), (unsigned long) &rfc);
2274 }
2275
5dee9e7c
MH		 2276 if (result == L2CAP_CONF_SUCCESS) {
2277 /* Configure output options and let the other side know
2278 * which ones we don't like. */
2279
f2fcfcd6
GP		 2280 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2281 result = L2CAP_CONF_UNACCEPT;
2282 else {
0c1bc5c6 2283 chan->omtu = mtu;
c1360a1c 2284 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 2285 }
0c1bc5c6 2286 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 2287
42dceae2
AE		 2288 if (remote_efs) {
2289 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2290 efs.stype != L2CAP_SERV_NOTRAFIC &&
2291 efs.stype != chan->local_stype) {
2292
2293 result = L2CAP_CONF_UNACCEPT;
2294
2295 if (chan->num_conf_req >= 1)
2296 return -ECONNREFUSED;
2297
2298 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3e6b3b95 2299 sizeof(efs),
42dceae2 2300 (unsigned long) &efs);
0e8b207e 2301 } else {
3e6b3b95 2302 /* Send PENDING Conf Rsp */
0e8b207e
AE		 2303 result = L2CAP_CONF_PENDING;
2304 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 2305 }
2306 }
2307
f2fcfcd6
GP		 2308 switch (rfc.mode) {
2309 case L2CAP_MODE_BASIC:
47d1ec61 2310 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 2311 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 2312 break;
2313
2314 case L2CAP_MODE_ERTM:
6327eb98
AE		 2315 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
2316 chan->remote_tx_win = rfc.txwin_size;
2317 else
2318 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 2319
2c03a7a4 2320 chan->remote_max_tx = rfc.max_transmit;
1c762159 2321
c8f79162
AE		 2322 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2323 chan->conn->mtu -
2324 L2CAP_EXT_HDR_SIZE -
2325 L2CAP_SDULEN_SIZE -
2326 L2CAP_FCS_SIZE);
2327 rfc.max_pdu_size = cpu_to_le16(size);
2328 chan->remote_mps = size;
f2fcfcd6 2329
10467e9e
GP		 2330 rfc.retrans_timeout =
2331 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2332 rfc.monitor_timeout =
2333 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6 2334
c1360a1c 2335 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 2336
2337 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2338 sizeof(rfc), (unsigned long) &rfc);
2339
42dceae2
AE		 2340 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2341 chan->remote_id = efs.id;
2342 chan->remote_stype = efs.stype;
2343 chan->remote_msdu = le16_to_cpu(efs.msdu);
2344 chan->remote_flush_to =
2345 le32_to_cpu(efs.flush_to);
2346 chan->remote_acc_lat =
2347 le32_to_cpu(efs.acc_lat);
2348 chan->remote_sdu_itime =
2349 le32_to_cpu(efs.sdu_itime);
2350 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2351 sizeof(efs), (unsigned long) &efs);
2352 }
f2fcfcd6
GP		 2353 break;
2354
2355 case L2CAP_MODE_STREAMING:
c8f79162
AE		 2356 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2357 chan->conn->mtu -
2358 L2CAP_EXT_HDR_SIZE -
2359 L2CAP_SDULEN_SIZE -
2360 L2CAP_FCS_SIZE);
2361 rfc.max_pdu_size = cpu_to_le16(size);
2362 chan->remote_mps = size;
f2fcfcd6 2363
c1360a1c 2364 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 2365
2366 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2367 sizeof(rfc), (unsigned long) &rfc);
2368
f2fcfcd6
GP		 2369 break;
2370
2371 default:
5dee9e7c 2372 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2373
6464f35f 2374 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 2375 rfc.mode = chan->mode;
f2fcfcd6 2376 }
6464f35f 2377
f2fcfcd6 2378 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 2379 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 2380 }
fe4128e0 2381 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c
MH		 2382 rsp->result = cpu_to_le16(result);
2383 rsp->flags = cpu_to_le16(0x0000);
2384
2385 return ptr - data;
1da177e4
LT		 2386}
2387
b4450035 2388static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
f2fcfcd6 2389{
f2fcfcd6
GP		 2390 struct l2cap_conf_req *req = data;
2391 void *ptr = req->data;
2392 int type, olen;
2393 unsigned long val;
36e999a8 2394 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 2395 struct l2cap_conf_efs efs;
f2fcfcd6 2396
fe4128e0 2397 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 2398
2399 while (len >= L2CAP_CONF_OPT_SIZE) {
2400 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2401
2402 switch (type) {
2403 case L2CAP_CONF_MTU:
2404 if (val < L2CAP_DEFAULT_MIN_MTU) {
2405 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2406 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 2407 } else
0c1bc5c6
GP		 2408 chan->imtu = val;
2409 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 2410 break;
2411
2412 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2413 chan->flush_to = val;
f2fcfcd6 2414 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
0c1bc5c6 2415 2, chan->flush_to);
f2fcfcd6
GP		 2416 break;
2417
2418 case L2CAP_CONF_RFC:
2419 if (olen == sizeof(rfc))
2420 memcpy(&rfc, (void *)val, olen);
2421
c1360a1c 2422 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
0c1bc5c6 2423 rfc.mode != chan->mode)
f2fcfcd6
GP		 2424 return -ECONNREFUSED;
2425
47d1ec61 2426 chan->fcs = 0;
f2fcfcd6
GP		 2427
2428 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2429 sizeof(rfc), (unsigned long) &rfc);
2430 break;
6327eb98
AE		 2431
2432 case L2CAP_CONF_EWS:
2433 chan->tx_win = min_t(u16, val,
2434 L2CAP_DEFAULT_EXT_WINDOW);
3e6b3b95
GP		 2435 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2436 chan->tx_win);
6327eb98 2437 break;
66af7aaf
AE		 2438
2439 case L2CAP_CONF_EFS:
2440 if (olen == sizeof(efs))
2441 memcpy(&efs, (void *)val, olen);
2442
2443 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2444 efs.stype != L2CAP_SERV_NOTRAFIC &&
2445 efs.stype != chan->local_stype)
2446 return -ECONNREFUSED;
2447
2448 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2449 sizeof(efs), (unsigned long) &efs);
2450 break;
f2fcfcd6
GP		 2451 }
2452 }
2453
0c1bc5c6 2454 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 2455 return -ECONNREFUSED;
2456
0c1bc5c6 2457 chan->mode = rfc.mode;
6c2ea7a8 2458
0e8b207e 2459 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 2460 switch (rfc.mode) {
2461 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2462 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2463 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2464 chan->mps = le16_to_cpu(rfc.max_pdu_size);
66af7aaf
AE		 2465
2466 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2467 chan->local_msdu = le16_to_cpu(efs.msdu);
2468 chan->local_sdu_itime =
2469 le32_to_cpu(efs.sdu_itime);
2470 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
2471 chan->local_flush_to =
2472 le32_to_cpu(efs.flush_to);
2473 }
f2fcfcd6 2474 break;
66af7aaf 2475
f2fcfcd6 2476 case L2CAP_MODE_STREAMING:
47d1ec61 2477 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2478 }
2479 }
2480
fe4128e0 2481 req->dcid = cpu_to_le16(chan->dcid);
f2fcfcd6
GP		 2482 req->flags = cpu_to_le16(0x0000);
2483
2484 return ptr - data;
2485}
2486
fe4128e0 2487static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1da177e4
LT		 2488{
2489 struct l2cap_conf_rsp *rsp = data;
2490 void *ptr = rsp->data;
1da177e4 2491
fe4128e0 2492 BT_DBG("chan %p", chan);
1da177e4 2493
fe4128e0 2494 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 2495 rsp->result = cpu_to_le16(result);
aca3192c 2496 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2497
2498 return ptr - data;
2499}
2500
8c1d787b 2501void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 2502{
2503 struct l2cap_conn_rsp rsp;
8c1d787b 2504 struct l2cap_conn *conn = chan->conn;
710f9b0a
GP		 2505 u8 buf[128];
2506
fe4128e0
GP		 2507 rsp.scid = cpu_to_le16(chan->dcid);
2508 rsp.dcid = cpu_to_le16(chan->scid);
710f9b0a
GP		 2509 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
2510 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
2511 l2cap_send_cmd(conn, chan->ident,
2512 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2513
c1360a1c 2514 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 2515 return;
2516
710f9b0a
GP		 2517 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2518 l2cap_build_conf_req(chan, buf), buf);
2519 chan->num_conf_req++;
2520}
2521
47d1ec61 2522static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 2523{
7b1c0049
GP		 2524 int type, olen;
2525 unsigned long val;
2526 struct l2cap_conf_rfc rfc;
2527
47d1ec61 2528 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 2529
0c1bc5c6 2530 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 2531 return;
2532
2533 while (len >= L2CAP_CONF_OPT_SIZE) {
2534 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2535
2536 switch (type) {
2537 case L2CAP_CONF_RFC:
2538 if (olen == sizeof(rfc))
2539 memcpy(&rfc, (void *)val, olen);
2540 goto done;
2541 }
2542 }
2543
36e999a8
MM		 2544 /* Use sane default values in case a misbehaving remote device
2545 * did not send an RFC option.
2546 */
2547 rfc.mode = chan->mode;
2548 rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
2549 rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
2550 rfc.max_pdu_size = cpu_to_le16(chan->imtu);
2551
2552 BT_ERR("Expected RFC option was not found, using defaults");
2553
7b1c0049
GP		 2554done:
2555 switch (rfc.mode) {
2556 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2557 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2558 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2559 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2560 break;
2561 case L2CAP_MODE_STREAMING:
47d1ec61 2562 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2563 }
2564}
2565
4e8402a3
MH		 2566static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2567{
e2fd318e 2568 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 2569
e2fd318e 2570 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 2571 return 0;
2572
2573 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2574 cmd->ident == conn->info_ident) {
371fd835 2575 __cancel_delayed_work(&conn->info_timer);
984947dc
MH		 2576
2577 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2578 conn->info_ident = 0;
984947dc 2579
4e8402a3
MH		 2580 l2cap_conn_start(conn);
2581 }
2582
2583 return 0;
2584}
2585
1da177e4
LT		 2586static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2587{
1da177e4
LT		 2588 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2589 struct l2cap_conn_rsp rsp;
23691d75 2590 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 2591 struct sock *parent, *sk = NULL;
e7c29cb1 2592 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2593
2594 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2595 __le16 psm = req->psm;
1da177e4
LT		 2596
2597 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2598
2599 /* Check if we have socket listening on psm */
23691d75
GP		 2600 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src);
2601 if (!pchan) {
1da177e4
LT		 2602 result = L2CAP_CR_BAD_PSM;
2603 goto sendresp;
2604 }
2605
23691d75
GP		 2606 parent = pchan->sk;
2607
aa2ac881 2608 lock_sock(parent);
e0f0cb56 2609
e7c29cb1
MH		 2610 /* Check if the ACL is secure enough (if not SDP) */
2611 if (psm != cpu_to_le16(0x0001) &&
2612 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 2613 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 2614 result = L2CAP_CR_SEC_BLOCK;
2615 goto response;
2616 }
2617
1da177e4
LT		 2618 result = L2CAP_CR_NO_MEM;
2619
2620 /* Check for backlog size */
2621 if (sk_acceptq_is_full(parent)) {
8e87d142 2622 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2623 goto response;
2624 }
2625
80808e43
GP		 2626 chan = pchan->ops->new_connection(pchan->data);
2627 if (!chan)
1da177e4
LT		 2628 goto response;
2629
80808e43
GP		 2630 sk = chan->sk;
2631
1da177e4 2632 /* Check if we already have channel with that dcid */
baa7e1fa 2633 if (__l2cap_get_chan_by_dcid(conn, scid)) {
1da177e4 2634 sock_set_flag(sk, SOCK_ZAPPED);
ba3bd0ee 2635 chan->ops->close(chan->data);
1da177e4
LT		 2636 goto response;
2637 }
2638
2639 hci_conn_hold(conn->hcon);
2640
1da177e4
LT		 2641 bacpy(&bt_sk(sk)->src, conn->src);
2642 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 2643 chan->psm = psm;
2644 chan->dcid = scid;
1da177e4 2645
d1010240
GP		 2646 bt_accept_enqueue(parent, sk);
2647
3d57dc68 2648 l2cap_chan_add(conn, chan);
48454079 2649
fe4128e0 2650 dcid = chan->scid;
1da177e4 2651
c9b66675 2652 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 2653
fc7f8a7e 2654 chan->ident = cmd->ident;
1da177e4 2655
984947dc 2656 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 2657 if (l2cap_chan_check_security(chan)) {
f66dc81f 2658 if (bt_sk(sk)->defer_setup) {
89bc500e 2659 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 2660 result = L2CAP_CR_PEND;
2661 status = L2CAP_CS_AUTHOR_PEND;
2662 parent->sk_data_ready(parent, 0);
2663 } else {
89bc500e 2664 l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 2665 result = L2CAP_CR_SUCCESS;
2666 status = L2CAP_CS_NO_INFO;
2667 }
79d554a6 2668 } else {
89bc500e 2669 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 2670 result = L2CAP_CR_PEND;
2671 status = L2CAP_CS_AUTHEN_PEND;
2672 }
2673 } else {
89bc500e 2674 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 2675 result = L2CAP_CR_PEND;
2676 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2677 }
2678
1da177e4 2679response:
aa2ac881 2680 release_sock(parent);
1da177e4
LT		 2681
2682sendresp:
aca3192c
YH		 2683 rsp.scid = cpu_to_le16(scid);
2684 rsp.dcid = cpu_to_le16(dcid);
2685 rsp.result = cpu_to_le16(result);
2686 rsp.status = cpu_to_le16(status);
1da177e4 2687 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2688
2689 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2690 struct l2cap_info_req info;
2691 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2692
2693 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2694 conn->info_ident = l2cap_get_ident(conn);
2695
030013d8 2696 schedule_delayed_work(&conn->info_timer,
79d554a6
MH		 2697 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2698
2699 l2cap_send_cmd(conn, conn->info_ident,
2700 L2CAP_INFO_REQ, sizeof(info), &info);
2701 }
2702
c1360a1c 2703 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
e9aeb2dd
GP		 2704 result == L2CAP_CR_SUCCESS) {
2705 u8 buf[128];
c1360a1c 2706 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 2707 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2708 l2cap_build_conf_req(chan, buf), buf);
2709 chan->num_conf_req++;
e9aeb2dd
GP		 2710 }
2711
1da177e4
LT		 2712 return 0;
2713}
2714
2715static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2716{
2717 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2718 u16 scid, dcid, result, status;
48454079 2719 struct l2cap_chan *chan;
1da177e4
LT		 2720 struct sock *sk;
2721 u8 req[128];
2722
2723 scid = __le16_to_cpu(rsp->scid);
2724 dcid = __le16_to_cpu(rsp->dcid);
2725 result = __le16_to_cpu(rsp->result);
2726 status = __le16_to_cpu(rsp->status);
2727
2728 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2729
2730 if (scid) {
baa7e1fa 2731 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2732 if (!chan)
57d3b22b 2733 return -EFAULT;
1da177e4 2734 } else {
baa7e1fa 2735 chan = l2cap_get_chan_by_ident(conn, cmd->ident);
48454079 2736 if (!chan)
57d3b22b 2737 return -EFAULT;
1da177e4
LT		 2738 }
2739
48454079
GP		 2740 sk = chan->sk;
2741
1da177e4
LT		 2742 switch (result) {
2743 case L2CAP_CR_SUCCESS:
89bc500e 2744 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 2745 chan->ident = 0;
fe4128e0 2746 chan->dcid = dcid;
c1360a1c 2747 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 2748
c1360a1c 2749 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 2750 break;
2751
1da177e4 2752 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2753 l2cap_build_conf_req(chan, req), req);
2754 chan->num_conf_req++;
1da177e4
LT		 2755 break;
2756
2757 case L2CAP_CR_PEND:
c1360a1c 2758 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 2759 break;
2760
2761 default:
48454079 2762 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 2763 break;
2764 }
2765
aa2ac881 2766 release_sock(sk);
1da177e4
LT		 2767 return 0;
2768}
2769
47d1ec61 2770static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 2771{
2772 /* FCS is enabled only in ERTM or streaming mode, if one or both
2773 * sides request it.
2774 */
0c1bc5c6 2775 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 2776 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 2777 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 2778 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 2779}
2780
88219a0f 2781static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 2782{
2783 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2784 u16 dcid, flags;
2785 u8 rsp[64];
48454079 2786 struct l2cap_chan *chan;
1da177e4 2787 struct sock *sk;
5dee9e7c 2788 int len;
1da177e4
LT		 2789
2790 dcid = __le16_to_cpu(req->dcid);
2791 flags = __le16_to_cpu(req->flags);
2792
2793 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2794
baa7e1fa 2795 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 2796 if (!chan)
1da177e4
LT		 2797 return -ENOENT;
2798
48454079
GP		 2799 sk = chan->sk;
2800
033b1142 2801 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 2802 struct l2cap_cmd_rej_cid rej;
2803
2804 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
2805 rej.scid = cpu_to_le16(chan->scid);
2806 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 2807
df6bd743
GP		 2808 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2809 sizeof(rej), &rej);
354f60a9 2810 goto unlock;
df6bd743 2811 }
354f60a9 2812
5dee9e7c 2813 /* Reject if config buffer is too small. */
88219a0f 2814 len = cmd_len - sizeof(*req);
7ac28817 2815 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 2816 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 2817 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c
MH		 2818 L2CAP_CONF_REJECT, flags), rsp);
2819 goto unlock;
2820 }
2821
2822 /* Store config. */
73ffa904
GP		 2823 memcpy(chan->conf_req + chan->conf_len, req->data, len);
2824 chan->conf_len += len;
1da177e4
LT		 2825
2826 if (flags & 0x0001) {
2827 /* Incomplete config. Send empty response. */
2828 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 2829 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c 2830 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 2831 goto unlock;
2832 }
2833
2834 /* Complete config. */
73ffa904 2835 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 2836 if (len < 0) {
e92c8e70 2837 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 2838 goto unlock;
f2fcfcd6 2839 }
1da177e4 2840
5dee9e7c 2841 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 2842 chan->num_conf_rsp++;
5dee9e7c 2843
5dee9e7c 2844 /* Reset config buffer. */
73ffa904 2845 chan->conf_len = 0;
5dee9e7c 2846
c1360a1c 2847 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 2848 goto unlock;
2849
c1360a1c 2850 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 2851 set_default_fcs(chan);
fcc203c3 2852
89bc500e 2853 l2cap_state_change(chan, BT_CONNECTED);
e90bac06 2854
42e5c802
GP		 2855 chan->next_tx_seq = 0;
2856 chan->expected_tx_seq = 0;
58d35f87 2857 skb_queue_head_init(&chan->tx_q);
0c1bc5c6 2858 if (chan->mode == L2CAP_MODE_ERTM)
525cd185 2859 l2cap_ertm_init(chan);
0565c1c2 2860
1da177e4 2861 l2cap_chan_ready(sk);
876d9484
MH		 2862 goto unlock;
2863 }
2864
c1360a1c 2865 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 2866 u8 buf[64];
1da177e4 2867 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2868 l2cap_build_conf_req(chan, buf), buf);
2869 chan->num_conf_req++;
1da177e4
LT		 2870 }
2871
0e8b207e
AE		 2872 /* Got Conf Rsp PENDING from remote side and asume we sent
2873 Conf Rsp PENDING in the code above */
2874 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
2875 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
2876
2877 /* check compatibility */
2878
2879 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2880 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2881
2882 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 2883 l2cap_build_conf_rsp(chan, rsp,
0e8b207e
AE		 2884 L2CAP_CONF_SUCCESS, 0x0000), rsp);
2885 }
2886
1da177e4 2887unlock:
aa2ac881 2888 release_sock(sk);
1da177e4
LT		 2889 return 0;
2890}
2891
2892static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2893{
2894 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2895 u16 scid, flags, result;
48454079 2896 struct l2cap_chan *chan;
1da177e4 2897 struct sock *sk;
7b1c0049 2898 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 2899
2900 scid = __le16_to_cpu(rsp->scid);
2901 flags = __le16_to_cpu(rsp->flags);
2902 result = __le16_to_cpu(rsp->result);
2903
af05b30b
GP		 2904 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2905 scid, flags, result);
1da177e4 2906
baa7e1fa 2907 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2908 if (!chan)
1da177e4
LT		 2909 return 0;
2910
48454079
GP		 2911 sk = chan->sk;
2912
1da177e4
LT		 2913 switch (result) {
2914 case L2CAP_CONF_SUCCESS:
47d1ec61 2915 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 2916 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 2917 break;
2918
0e8b207e
AE		 2919 case L2CAP_CONF_PENDING:
2920 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
2921
2922 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
2923 char buf[64];
2924
2925 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2926 buf, &result);
2927 if (len < 0) {
2928 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2929 goto done;
2930 }
2931
2932 /* check compatibility */
2933
2934 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2935 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2936
2937 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 2938 l2cap_build_conf_rsp(chan, buf,
0e8b207e
AE		 2939 L2CAP_CONF_SUCCESS, 0x0000), buf);
2940 }
2941 goto done;
2942
1da177e4 2943 case L2CAP_CONF_UNACCEPT:
73ffa904 2944 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 2945 char req[64];
2946
c2c77ec8 2947 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 2948 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 2949 goto done;
2950 }
2951
f2fcfcd6
GP		 2952 /* throw out any old stored conf requests */
2953 result = L2CAP_CONF_SUCCESS;
b4450035
GP		 2954 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2955 req, &result);
f2fcfcd6 2956 if (len < 0) {
e92c8e70 2957 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 2958 goto done;
2959 }
2960
2961 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2962 L2CAP_CONF_REQ, len, req);
73ffa904 2963 chan->num_conf_req++;
f2fcfcd6
GP		 2964 if (result != L2CAP_CONF_SUCCESS)
2965 goto done;
2966 break;
1da177e4
LT		 2967 }
2968
8e87d142 2969 default:
b1235d79 2970 sk->sk_err = ECONNRESET;
f3f668b0 2971 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
e92c8e70 2972 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 2973 goto done;
2974 }
2975
2976 if (flags & 0x01)
2977 goto done;
2978
c1360a1c 2979 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 2980
c1360a1c 2981 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 2982 set_default_fcs(chan);
fcc203c3 2983
89bc500e 2984 l2cap_state_change(chan, BT_CONNECTED);
42e5c802
GP		 2985 chan->next_tx_seq = 0;
2986 chan->expected_tx_seq = 0;
58d35f87 2987 skb_queue_head_init(&chan->tx_q);
0c1bc5c6 2988 if (chan->mode == L2CAP_MODE_ERTM)
525cd185 2989 l2cap_ertm_init(chan);
0565c1c2 2990
1da177e4
LT		 2991 l2cap_chan_ready(sk);
2992 }
2993
2994done:
aa2ac881 2995 release_sock(sk);
1da177e4
LT		 2996 return 0;
2997}
2998
2999static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3000{
3001 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3002 struct l2cap_disconn_rsp rsp;
3003 u16 dcid, scid;
48454079 3004 struct l2cap_chan *chan;
1da177e4
LT		 3005 struct sock *sk;
3006
3007 scid = __le16_to_cpu(req->scid);
3008 dcid = __le16_to_cpu(req->dcid);
3009
3010 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3011
baa7e1fa 3012 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3013 if (!chan)
1da177e4
LT		 3014 return 0;
3015
48454079
GP		 3016 sk = chan->sk;
3017
fe4128e0
GP		 3018 rsp.dcid = cpu_to_le16(chan->scid);
3019 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 3020 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3021
3022 sk->sk_shutdown = SHUTDOWN_MASK;
3023
48454079 3024 l2cap_chan_del(chan, ECONNRESET);
aa2ac881 3025 release_sock(sk);
1da177e4 3026
ba3bd0ee 3027 chan->ops->close(chan->data);
1da177e4
LT		 3028 return 0;
3029}
3030
3031static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3032{
3033 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3034 u16 dcid, scid;
48454079 3035 struct l2cap_chan *chan;
1da177e4
LT		 3036 struct sock *sk;
3037
3038 scid = __le16_to_cpu(rsp->scid);
3039 dcid = __le16_to_cpu(rsp->dcid);
3040
3041 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3042
baa7e1fa 3043 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3044 if (!chan)
1da177e4
LT		 3045 return 0;
3046
48454079
GP		 3047 sk = chan->sk;
3048
48454079 3049 l2cap_chan_del(chan, 0);
aa2ac881 3050 release_sock(sk);
1da177e4 3051
ba3bd0ee 3052 chan->ops->close(chan->data);
1da177e4
LT		 3053 return 0;
3054}
3055
3056static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3057{
3058 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3059 u16 type;
3060
3061 type = __le16_to_cpu(req->type);
3062
3063 BT_DBG("type 0x%4.4x", type);
3064
f0709e03
MH		 3065 if (type == L2CAP_IT_FEAT_MASK) {
3066 u8 buf[8];
44dd46de 3067 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3068 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3069 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3070 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3071 if (!disable_ertm)
fcc203c3
GP		 3072 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3073 | L2CAP_FEAT_FCS;
a5fd6f30 3074 if (enable_hs)
6327eb98
AE		 3075 feat_mask |= L2CAP_FEAT_EXT_FLOW
3076 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 3077
1b7bf4ed 3078 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3079 l2cap_send_cmd(conn, cmd->ident,
3080 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3081 } else if (type == L2CAP_IT_FIXED_CHAN) {
3082 u8 buf[12];
3083 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 3084
3085 if (enable_hs)
3086 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
3087 else
3088 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
3089
e1027a7c
MH		 3090 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3091 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 3092 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
e1027a7c
MH		 3093 l2cap_send_cmd(conn, cmd->ident,
3094 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3095 } else {
3096 struct l2cap_info_rsp rsp;
3097 rsp.type = cpu_to_le16(type);
3098 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3099 l2cap_send_cmd(conn, cmd->ident,
3100 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3101 }
1da177e4
LT		 3102
3103 return 0;
3104}
3105
3106static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3107{
3108 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3109 u16 type, result;
3110
3111 type = __le16_to_cpu(rsp->type);
3112 result = __le16_to_cpu(rsp->result);
3113
3114 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3115
e90165be
AE		 3116 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
3117 if (cmd->ident != conn->info_ident ||
3118 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
3119 return 0;
3120
371fd835 3121 __cancel_delayed_work(&conn->info_timer);
4e8402a3 3122
adb08ede
VT		 3123 if (result != L2CAP_IR_SUCCESS) {
3124 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3125 conn->info_ident = 0;
3126
3127 l2cap_conn_start(conn);
3128
3129 return 0;
3130 }
3131
984947dc 3132 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3133 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3134
47ec1dcd 3135 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3136 struct l2cap_info_req req;
3137 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3138
3139 conn->info_ident = l2cap_get_ident(conn);
3140
3141 l2cap_send_cmd(conn, conn->info_ident,
3142 L2CAP_INFO_REQ, sizeof(req), &req);
3143 } else {
3144 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3145 conn->info_ident = 0;
3146
3147 l2cap_conn_start(conn);
3148 }
3149 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3150 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3151 conn->info_ident = 0;
984947dc
MH		 3152
3153 l2cap_conn_start(conn);
3154 }
4e8402a3 3155
1da177e4
LT		 3156 return 0;
3157}
3158
f94ff6ff
MM		 3159static inline int l2cap_create_channel_req(struct l2cap_conn *conn,
3160 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3161 void *data)
3162{
3163 struct l2cap_create_chan_req *req = data;
3164 struct l2cap_create_chan_rsp rsp;
3165 u16 psm, scid;
3166
3167 if (cmd_len != sizeof(*req))
3168 return -EPROTO;
3169
3170 if (!enable_hs)
3171 return -EINVAL;
3172
3173 psm = le16_to_cpu(req->psm);
3174 scid = le16_to_cpu(req->scid);
3175
3176 BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id);
3177
3178 /* Placeholder: Always reject */
3179 rsp.dcid = 0;
3180 rsp.scid = cpu_to_le16(scid);
3181 rsp.result = L2CAP_CR_NO_MEM;
3182 rsp.status = L2CAP_CS_NO_INFO;
3183
3184 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
3185 sizeof(rsp), &rsp);
3186
3187 return 0;
3188}
3189
3190static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn,
3191 struct l2cap_cmd_hdr *cmd, void *data)
3192{
3193 BT_DBG("conn %p", conn);
3194
3195 return l2cap_connect_rsp(conn, cmd, data);
3196}
3197
8d5a04a1
MM		 3198static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
3199 u16 icid, u16 result)
3200{
3201 struct l2cap_move_chan_rsp rsp;
3202
3203 BT_DBG("icid %d, result %d", icid, result);
3204
3205 rsp.icid = cpu_to_le16(icid);
3206 rsp.result = cpu_to_le16(result);
3207
3208 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
3209}
3210
3211static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn,
3212 struct l2cap_chan *chan, u16 icid, u16 result)
3213{
3214 struct l2cap_move_chan_cfm cfm;
3215 u8 ident;
3216
3217 BT_DBG("icid %d, result %d", icid, result);
3218
3219 ident = l2cap_get_ident(conn);
3220 if (chan)
3221 chan->ident = ident;
3222
3223 cfm.icid = cpu_to_le16(icid);
3224 cfm.result = cpu_to_le16(result);
3225
3226 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm);
3227}
3228
3229static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
3230 u16 icid)
3231{
3232 struct l2cap_move_chan_cfm_rsp rsp;
3233
3234 BT_DBG("icid %d", icid);
3235
3236 rsp.icid = cpu_to_le16(icid);
3237 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
3238}
3239
3240static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
3241 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3242{
3243 struct l2cap_move_chan_req *req = data;
3244 u16 icid = 0;
3245 u16 result = L2CAP_MR_NOT_ALLOWED;
3246
3247 if (cmd_len != sizeof(*req))
3248 return -EPROTO;
3249
3250 icid = le16_to_cpu(req->icid);
3251
3252 BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id);
3253
3254 if (!enable_hs)
3255 return -EINVAL;
3256
3257 /* Placeholder: Always refuse */
3258 l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
3259
3260 return 0;
3261}
3262
3263static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
3264 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3265{
3266 struct l2cap_move_chan_rsp *rsp = data;
3267 u16 icid, result;
3268
3269 if (cmd_len != sizeof(*rsp))
3270 return -EPROTO;
3271
3272 icid = le16_to_cpu(rsp->icid);
3273 result = le16_to_cpu(rsp->result);
3274
3275 BT_DBG("icid %d, result %d", icid, result);
3276
3277 /* Placeholder: Always unconfirmed */
3278 l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED);
3279
3280 return 0;
3281}
3282
3283static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
3284 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3285{
3286 struct l2cap_move_chan_cfm *cfm = data;
3287 u16 icid, result;
3288
3289 if (cmd_len != sizeof(*cfm))
3290 return -EPROTO;
3291
3292 icid = le16_to_cpu(cfm->icid);
3293 result = le16_to_cpu(cfm->result);
3294
3295 BT_DBG("icid %d, result %d", icid, result);
3296
3297 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
3298
3299 return 0;
3300}
3301
3302static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
3303 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3304{
3305 struct l2cap_move_chan_cfm_rsp *rsp = data;
3306 u16 icid;
3307
3308 if (cmd_len != sizeof(*rsp))
3309 return -EPROTO;
3310
3311 icid = le16_to_cpu(rsp->icid);
3312
3313 BT_DBG("icid %d", icid);
3314
3315 return 0;
3316}
3317
e2174ca4 3318static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
de73115a
CT		 3319 u16 to_multiplier)
3320{
3321 u16 max_latency;
3322
3323 if (min > max || min < 6 || max > 3200)
3324 return -EINVAL;
3325
3326 if (to_multiplier < 10 || to_multiplier > 3200)
3327 return -EINVAL;
3328
3329 if (max >= to_multiplier * 8)
3330 return -EINVAL;
3331
3332 max_latency = (to_multiplier * 8 / max) - 1;
3333 if (latency > 499 || latency > max_latency)
3334 return -EINVAL;
3335
3336 return 0;
3337}
3338
3339static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
3340 struct l2cap_cmd_hdr *cmd, u8 *data)
3341{
3342 struct hci_conn *hcon = conn->hcon;
3343 struct l2cap_conn_param_update_req *req;
3344 struct l2cap_conn_param_update_rsp rsp;
3345 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 3346 int err;
de73115a
CT		 3347
3348 if (!(hcon->link_mode & HCI_LM_MASTER))
3349 return -EINVAL;
3350
3351 cmd_len = __le16_to_cpu(cmd->len);
3352 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
3353 return -EPROTO;
3354
3355 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 3356 min = __le16_to_cpu(req->min);
3357 max = __le16_to_cpu(req->max);
de73115a
CT		 3358 latency = __le16_to_cpu(req->latency);
3359 to_multiplier = __le16_to_cpu(req->to_multiplier);
3360
3361 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
3362 min, max, latency, to_multiplier);
3363
3364 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 3365
3366 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
3367 if (err)
de73115a
CT		 3368 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
3369 else
3370 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
3371
3372 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
3373 sizeof(rsp), &rsp);
3374
2ce603eb
CT		 3375 if (!err)
3376 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
3377
de73115a
CT		 3378 return 0;
3379}
3380
3300d9a9
CT		 3381static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
3382 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3383{
3384 int err = 0;
3385
3386 switch (cmd->code) {
3387 case L2CAP_COMMAND_REJ:
3388 l2cap_command_rej(conn, cmd, data);
3389 break;
3390
3391 case L2CAP_CONN_REQ:
3392 err = l2cap_connect_req(conn, cmd, data);
3393 break;
3394
3395 case L2CAP_CONN_RSP:
3396 err = l2cap_connect_rsp(conn, cmd, data);
3397 break;
3398
3399 case L2CAP_CONF_REQ:
3400 err = l2cap_config_req(conn, cmd, cmd_len, data);
3401 break;
3402
3403 case L2CAP_CONF_RSP:
3404 err = l2cap_config_rsp(conn, cmd, data);
3405 break;
3406
3407 case L2CAP_DISCONN_REQ:
3408 err = l2cap_disconnect_req(conn, cmd, data);
3409 break;
3410
3411 case L2CAP_DISCONN_RSP:
3412 err = l2cap_disconnect_rsp(conn, cmd, data);
3413 break;
3414
3415 case L2CAP_ECHO_REQ:
3416 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
3417 break;
3418
3419 case L2CAP_ECHO_RSP:
3420 break;
3421
3422 case L2CAP_INFO_REQ:
3423 err = l2cap_information_req(conn, cmd, data);
3424 break;
3425
3426 case L2CAP_INFO_RSP:
3427 err = l2cap_information_rsp(conn, cmd, data);
3428 break;
3429
f94ff6ff
MM		 3430 case L2CAP_CREATE_CHAN_REQ:
3431 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
3432 break;
3433
3434 case L2CAP_CREATE_CHAN_RSP:
3435 err = l2cap_create_channel_rsp(conn, cmd, data);
3436 break;
3437
8d5a04a1
MM		 3438 case L2CAP_MOVE_CHAN_REQ:
3439 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
3440 break;
3441
3442 case L2CAP_MOVE_CHAN_RSP:
3443 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
3444 break;
3445
3446 case L2CAP_MOVE_CHAN_CFM:
3447 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
3448 break;
3449
3450 case L2CAP_MOVE_CHAN_CFM_RSP:
3451 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
3452 break;
3453
3300d9a9
CT		 3454 default:
3455 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
3456 err = -EINVAL;
3457 break;
3458 }
3459
3460 return err;
3461}
3462
3463static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
3464 struct l2cap_cmd_hdr *cmd, u8 *data)
3465{
3466 switch (cmd->code) {
3467 case L2CAP_COMMAND_REJ:
3468 return 0;
3469
3470 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 3471 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 3472
3473 case L2CAP_CONN_PARAM_UPDATE_RSP:
3474 return 0;
3475
3476 default:
3477 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
3478 return -EINVAL;
3479 }
3480}
3481
3482static inline void l2cap_sig_channel(struct l2cap_conn *conn,
3483 struct sk_buff *skb)
1da177e4
LT		 3484{
3485 u8 *data = skb->data;
3486 int len = skb->len;
3487 struct l2cap_cmd_hdr cmd;
3300d9a9 3488 int err;
1da177e4
LT		 3489
3490 l2cap_raw_recv(conn, skb);
3491
3492 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3493 u16 cmd_len;
1da177e4
LT		 3494 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3495 data += L2CAP_CMD_HDR_SIZE;
3496 len -= L2CAP_CMD_HDR_SIZE;
3497
88219a0f 3498 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3499
88219a0f 3500 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3501
88219a0f 3502 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3503 BT_DBG("corrupted command");
3504 break;
3505 }
3506
3300d9a9
CT		 3507 if (conn->hcon->type == LE_LINK)
3508 err = l2cap_le_sig_cmd(conn, &cmd, data);
3509 else
3510 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 3511
3512 if (err) {
e2fd318e 3513 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 3514
3515 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 3516
3517 /* FIXME: Map err to a valid reason */
e2fd318e 3518 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
1da177e4
LT		 3519 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3520 }
3521
88219a0f
AV		 3522 data += cmd_len;
3523 len -= cmd_len;
1da177e4
LT		 3524 }
3525
3526 kfree_skb(skb);
3527}
3528
47d1ec61 3529static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 3530{
3531 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 3532 int hdr_size;
3533
3534 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3535 hdr_size = L2CAP_EXT_HDR_SIZE;
3536 else
3537 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 3538
47d1ec61 3539 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 3540 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 3541 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3542 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3543
3544 if (our_fcs != rcv_fcs)
7a560e5c 3545 return -EBADMSG;
fcc203c3
GP		 3546 }
3547 return 0;
3548}
3549
525cd185 3550static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 3551{
88843ab0 3552 u32 control = 0;
d5392c8f 3553
6a026610 3554 chan->frames_sent = 0;
d5392c8f 3555
0b209fae 3556 control |= __set_reqseq(chan, chan->buffer_seq);
d5392c8f 3557
e2ab4353 3558 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 3559 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
525cd185 3560 l2cap_send_sframe(chan, control);
e2ab4353 3561 set_bit(CONN_RNR_SENT, &chan->conn_state);
d5392c8f
GP		 3562 }
3563
e2ab4353 3564 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
525cd185 3565 l2cap_retransmit_frames(chan);
d5392c8f 3566
525cd185 3567 l2cap_ertm_send(chan);
d5392c8f 3568
e2ab4353 3569 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
6a026610 3570 chan->frames_sent == 0) {
ab784b73 3571 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 3572 l2cap_send_sframe(chan, control);
d5392c8f
GP		 3573 }
3574}
3575
fb45de7d 3576static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar)
8f17154f
GP		 3577{
3578 struct sk_buff *next_skb;
bfbacc11 3579 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3580
3581 bt_cb(skb)->tx_seq = tx_seq;
3582 bt_cb(skb)->sar = sar;
3583
f1c6775b 3584 next_skb = skb_peek(&chan->srej_q);
8f17154f 3585
836be934 3586 tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
bfbacc11 3587
039d9572 3588 while (next_skb) {
9b53350d
JPRV		 3589 if (bt_cb(next_skb)->tx_seq == tx_seq)
3590 return -EINVAL;
3591
836be934
AE		 3592 next_tx_seq_offset = __seq_offset(chan,
3593 bt_cb(next_skb)->tx_seq, chan->buffer_seq);
bfbacc11
JPRV		 3594
3595 if (next_tx_seq_offset > tx_seq_offset) {
f1c6775b 3596 __skb_queue_before(&chan->srej_q, next_skb, skb);
9b53350d 3597 return 0;
8f17154f
GP		 3598 }
3599
f1c6775b 3600 if (skb_queue_is_last(&chan->srej_q, next_skb))
039d9572
SJ		 3601 next_skb = NULL;
3602 else
3603 next_skb = skb_queue_next(&chan->srej_q, next_skb);
3604 }
8f17154f 3605
f1c6775b 3606 __skb_queue_tail(&chan->srej_q, skb);
9b53350d
JPRV		 3607
3608 return 0;
8f17154f
GP		 3609}
3610
84084a31
MM		 3611static void append_skb_frag(struct sk_buff *skb,
3612 struct sk_buff *new_frag, struct sk_buff **last_frag)
18778a63 3613{
84084a31
MM		 3614 /* skb->len reflects data in skb as well as all fragments
3615 * skb->data_len reflects only data in fragments
3616 */
3617 if (!skb_has_frag_list(skb))
3618 skb_shinfo(skb)->frag_list = new_frag;
3619
3620 new_frag->next = NULL;
3621
3622 (*last_frag)->next = new_frag;
3623 *last_frag = new_frag;
3624
3625 skb->len += new_frag->len;
3626 skb->data_len += new_frag->len;
3627 skb->truesize += new_frag->truesize;
3628}
3629
88843ab0 3630static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control)
84084a31
MM		 3631{
3632 int err = -EINVAL;
18778a63 3633
7e0ef6ee
AE		 3634 switch (__get_ctrl_sar(chan, control)) {
3635 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 3636 if (chan->sdu)
3637 break;
18778a63 3638
84084a31
MM		 3639 err = chan->ops->recv(chan->data, skb);
3640 break;
18778a63 3641
7e0ef6ee 3642 case L2CAP_SAR_START:
84084a31
MM		 3643 if (chan->sdu)
3644 break;
18778a63 3645
6f61fd47 3646 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 3647 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 3648
84084a31
MM		 3649 if (chan->sdu_len > chan->imtu) {
3650 err = -EMSGSIZE;
3651 break;
3652 }
1890d36b 3653
84084a31
MM		 3654 if (skb->len >= chan->sdu_len)
3655 break;
18778a63 3656
84084a31
MM		 3657 chan->sdu = skb;
3658 chan->sdu_last_frag = skb;
18778a63 3659
84084a31
MM		 3660 skb = NULL;
3661 err = 0;
18778a63
GP		 3662 break;
3663
7e0ef6ee 3664 case L2CAP_SAR_CONTINUE:
6f61fd47 3665 if (!chan->sdu)
84084a31 3666 break;
18778a63 3667
84084a31
MM		 3668 append_skb_frag(chan->sdu, skb,
3669 &chan->sdu_last_frag);
3670 skb = NULL;
18778a63 3671
84084a31
MM		 3672 if (chan->sdu->len >= chan->sdu_len)
3673 break;
4178ba46 3674
84084a31 3675 err = 0;
18778a63
GP		 3676 break;
3677
7e0ef6ee 3678 case L2CAP_SAR_END:
6f61fd47 3679 if (!chan->sdu)
84084a31 3680 break;
18778a63 3681
84084a31
MM		 3682 append_skb_frag(chan->sdu, skb,
3683 &chan->sdu_last_frag);
3684 skb = NULL;
4178ba46 3685
84084a31
MM		 3686 if (chan->sdu->len != chan->sdu_len)
3687 break;
18778a63 3688
84084a31 3689 err = chan->ops->recv(chan->data, chan->sdu);
1890d36b 3690
84084a31
MM		 3691 if (!err) {
3692 /* Reassembly complete */
3693 chan->sdu = NULL;
3694 chan->sdu_last_frag = NULL;
3695 chan->sdu_len = 0;
1890d36b 3696 }
18778a63
GP		 3697 break;
3698 }
3699
84084a31
MM		 3700 if (err) {
3701 kfree_skb(skb);
3702 kfree_skb(chan->sdu);
3703 chan->sdu = NULL;
3704 chan->sdu_last_frag = NULL;
3705 chan->sdu_len = 0;
3706 }
18778a63 3707
84084a31 3708 return err;
18778a63
GP		 3709}
3710
26f880d2 3711static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan)
712132eb 3712{
88843ab0 3713 u32 control;
712132eb 3714
26f880d2 3715 BT_DBG("chan %p, Enter local busy", chan);
712132eb 3716
26f880d2
MM		 3717 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3718
0b209fae 3719 control = __set_reqseq(chan, chan->buffer_seq);
ab784b73 3720 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
26f880d2
MM		 3721 l2cap_send_sframe(chan, control);
3722
3723 set_bit(CONN_RNR_SENT, &chan->conn_state);
3724
3725 __clear_ack_timer(chan);
3726}
3727
3728static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan)
3729{
88843ab0 3730 u32 control;
712132eb 3731
e2ab4353 3732 if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
712132eb
GP		 3733 goto done;
3734
0b209fae 3735 control = __set_reqseq(chan, chan->buffer_seq);
e3781735 3736 control |= __set_ctrl_poll(chan);
ab784b73 3737 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 3738 l2cap_send_sframe(chan, control);
6a026610 3739 chan->retry_count = 1;
712132eb 3740
1a09bcb9
GP		 3741 __clear_retrans_timer(chan);
3742 __set_monitor_timer(chan);
712132eb 3743
e2ab4353 3744 set_bit(CONN_WAIT_F, &chan->conn_state);
712132eb
GP		 3745
3746done:
e2ab4353
GP		 3747 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3748 clear_bit(CONN_RNR_SENT, &chan->conn_state);
712132eb 3749
49208c9c 3750 BT_DBG("chan %p, Exit local busy", chan);
712132eb
GP		 3751}
3752
e328140f 3753void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
1890d36b 3754{
e328140f
MM		 3755 if (chan->mode == L2CAP_MODE_ERTM) {
3756 if (busy)
3757 l2cap_ertm_enter_local_busy(chan);
3758 else
3759 l2cap_ertm_exit_local_busy(chan);
1890d36b 3760 }
1890d36b
GP		 3761}
3762
fb45de7d 3763static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq)
8f17154f
GP		 3764{
3765 struct sk_buff *skb;
88843ab0 3766 u32 control;
8f17154f 3767
e328140f
MM		 3768 while ((skb = skb_peek(&chan->srej_q)) &&
3769 !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
3770 int err;
3771
8f17154f
GP		 3772 if (bt_cb(skb)->tx_seq != tx_seq)
3773 break;
3774
f1c6775b 3775 skb = skb_dequeue(&chan->srej_q);
7e0ef6ee 3776 control = __set_ctrl_sar(chan, bt_cb(skb)->sar);
84084a31 3777 err = l2cap_reassemble_sdu(chan, skb, control);
e328140f
MM		 3778
3779 if (err < 0) {
3780 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3781 break;
3782 }
3783
836be934
AE		 3784 chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej);
3785 tx_seq = __next_seq(chan, tx_seq);
8f17154f
GP		 3786 }
3787}
3788
fb45de7d 3789static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 3790{
8f17154f 3791 struct srej_list *l, *tmp;
88843ab0 3792 u32 control;
8f17154f 3793
39d5a3ee 3794 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
8f17154f
GP		 3795 if (l->tx_seq == tx_seq) {
3796 list_del(&l->list);
3797 kfree(l);
3798 return;
3799 }
ab784b73 3800 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
0b209fae 3801 control |= __set_reqseq(chan, l->tx_seq);
525cd185 3802 l2cap_send_sframe(chan, control);
8f17154f 3803 list_del(&l->list);
39d5a3ee 3804 list_add_tail(&l->list, &chan->srej_l);
8f17154f
GP		 3805 }
3806}
3807
aef89f21 3808static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 3809{
8f17154f 3810 struct srej_list *new;
88843ab0 3811 u32 control;
8f17154f 3812
42e5c802 3813 while (tx_seq != chan->expected_tx_seq) {
ab784b73 3814 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
0b209fae 3815 control |= __set_reqseq(chan, chan->expected_tx_seq);
525cd185 3816 l2cap_send_sframe(chan, control);
8f17154f
GP		 3817
3818 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
aef89f21
SJ		 3819 if (!new)
3820 return -ENOMEM;
3821
42e5c802 3822 new->tx_seq = chan->expected_tx_seq;
836be934
AE		 3823
3824 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
3825
39d5a3ee 3826 list_add_tail(&new->list, &chan->srej_l);
8f17154f 3827 }
836be934
AE		 3828
3829 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
aef89f21
SJ		 3830
3831 return 0;
8f17154f
GP		 3832}
3833
88843ab0 3834static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
1c2acffb 3835{
fb45de7d 3836 u16 tx_seq = __get_txseq(chan, rx_control);
0b209fae 3837 u16 req_seq = __get_reqseq(chan, rx_control);
7e0ef6ee 3838 u8 sar = __get_ctrl_sar(chan, rx_control);
f6337c77 3839 int tx_seq_offset, expected_tx_seq_offset;
47d1ec61 3840 int num_to_ack = (chan->tx_win/6) + 1;
1c2acffb
GP		 3841 int err = 0;
3842
88843ab0 3843 BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len,
525cd185 3844 tx_seq, rx_control);
1c2acffb 3845
03f6715d 3846 if (__is_ctrl_final(chan, rx_control) &&
e2ab4353 3847 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1a09bcb9 3848 __clear_monitor_timer(chan);
6a026610 3849 if (chan->unacked_frames > 0)
1a09bcb9 3850 __set_retrans_timer(chan);
e2ab4353 3851 clear_bit(CONN_WAIT_F, &chan->conn_state);
1d8f5d16
GP		 3852 }
3853
42e5c802
GP		 3854 chan->expected_ack_seq = req_seq;
3855 l2cap_drop_acked_frames(chan);
9f121a5a 3856
836be934 3857 tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
9b53350d
JPRV		 3858
3859 /* invalid tx_seq */
47d1ec61 3860 if (tx_seq_offset >= chan->tx_win) {
8c1d787b 3861 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
9b53350d
JPRV		 3862 goto drop;
3863 }
3864
e2ab4353 3865 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1890d36b
GP		 3866 goto drop;
3867
02f1b641
MM		 3868 if (tx_seq == chan->expected_tx_seq)
3869 goto expected;
3870
e2ab4353 3871 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
8f17154f 3872 struct srej_list *first;
30afb5b2 3873
39d5a3ee 3874 first = list_first_entry(&chan->srej_l,
8f17154f
GP		 3875 struct srej_list, list);
3876 if (tx_seq == first->tx_seq) {
42e5c802 3877 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
525cd185 3878 l2cap_check_srej_gap(chan, tx_seq);
8f17154f
GP		 3879
3880 list_del(&first->list);
3881 kfree(first);
3882
39d5a3ee 3883 if (list_empty(&chan->srej_l)) {
42e5c802 3884 chan->buffer_seq = chan->buffer_seq_srej;
e2ab4353 3885 clear_bit(CONN_SREJ_SENT, &chan->conn_state);
525cd185 3886 l2cap_send_ack(chan);
49208c9c 3887 BT_DBG("chan %p, Exit SREJ_SENT", chan);
8f17154f
GP		 3888 }
3889 } else {
3890 struct srej_list *l;
9b53350d
JPRV		 3891
3892 /* duplicated tx_seq */
42e5c802 3893 if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
9b53350d 3894 goto drop;
8f17154f 3895
39d5a3ee 3896 list_for_each_entry(l, &chan->srej_l, list) {
8f17154f 3897 if (l->tx_seq == tx_seq) {
525cd185 3898 l2cap_resend_srejframe(chan, tx_seq);
8f17154f
GP		 3899 return 0;
3900 }
3901 }
aef89f21
SJ		 3902
3903 err = l2cap_send_srejframe(chan, tx_seq);
3904 if (err < 0) {
3905 l2cap_send_disconn_req(chan->conn, chan, -err);
3906 return err;
3907 }
30afb5b2
GP		 3908 }
3909 } else {
836be934
AE		 3910 expected_tx_seq_offset = __seq_offset(chan,
3911 chan->expected_tx_seq, chan->buffer_seq);
9b53350d
JPRV		 3912
3913 /* duplicated tx_seq */
3914 if (tx_seq_offset < expected_tx_seq_offset)
3915 goto drop;
3916
e2ab4353 3917 set_bit(CONN_SREJ_SENT, &chan->conn_state);
1c2acffb 3918
49208c9c 3919 BT_DBG("chan %p, Enter SREJ", chan);
0e98958d 3920
39d5a3ee 3921 INIT_LIST_HEAD(&chan->srej_l);
42e5c802 3922 chan->buffer_seq_srej = chan->buffer_seq;
8f17154f 3923
f1c6775b 3924 __skb_queue_head_init(&chan->srej_q);
42e5c802 3925 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
8f17154f 3926
e2ab4353 3927 set_bit(CONN_SEND_PBIT, &chan->conn_state);
ef54fd93 3928
aef89f21
SJ		 3929 err = l2cap_send_srejframe(chan, tx_seq);
3930 if (err < 0) {
3931 l2cap_send_disconn_req(chan->conn, chan, -err);
3932 return err;
3933 }
7fe9b298 3934
1a09bcb9 3935 __clear_ack_timer(chan);
1c2acffb 3936 }
30afb5b2
GP		 3937 return 0;
3938
8f17154f 3939expected:
836be934 3940 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
8f17154f 3941
e2ab4353 3942 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3b1a9f3f
GP		 3943 bt_cb(skb)->tx_seq = tx_seq;
3944 bt_cb(skb)->sar = sar;
f1c6775b 3945 __skb_queue_tail(&chan->srej_q, skb);
8f17154f
GP		 3946 return 0;
3947 }
3948
84084a31 3949 err = l2cap_reassemble_sdu(chan, skb, rx_control);
836be934
AE		 3950 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
3951
e328140f
MM		 3952 if (err < 0) {
3953 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3954 return err;
3955 }
2ece3684 3956
03f6715d 3957 if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 3958 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 3959 l2cap_retransmit_frames(chan);
4ec10d97
GP		 3960 }
3961
c1b4f43b 3962
6a026610
GP		 3963 chan->num_acked = (chan->num_acked + 1) % num_to_ack;
3964 if (chan->num_acked == num_to_ack - 1)
525cd185 3965 l2cap_send_ack(chan);
4d611e4d
GP		 3966 else
3967 __set_ack_timer(chan);
9e917af1 3968
8f17154f 3969 return 0;
9b53350d
JPRV		 3970
3971drop:
3972 kfree_skb(skb);
3973 return 0;
1c2acffb
GP		 3974}
3975
88843ab0 3976static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control)
1c2acffb 3977{
88843ab0 3978 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan,
0b209fae 3979 __get_reqseq(chan, rx_control), rx_control);
0e98958d 3980
0b209fae 3981 chan->expected_ack_seq = __get_reqseq(chan, rx_control);
42e5c802 3982 l2cap_drop_acked_frames(chan);
1c2acffb 3983
e3781735 3984 if (__is_ctrl_poll(chan, rx_control)) {
e2ab4353
GP		 3985 set_bit(CONN_SEND_FBIT, &chan->conn_state);
3986 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3987 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
6a026610 3988 (chan->unacked_frames > 0))
1a09bcb9 3989 __set_retrans_timer(chan);
05fbd89d 3990
e2ab4353 3991 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
525cd185 3992 l2cap_send_srejtail(chan);
05fbd89d 3993 } else {
525cd185 3994 l2cap_send_i_or_rr_or_rnr(chan);
05fbd89d 3995 }
1d8f5d16 3996
03f6715d 3997 } else if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 3998 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4ec10d97 3999
e2ab4353 4000 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 4001 l2cap_retransmit_frames(chan);
2246b2f1 4002
e072745f 4003 } else {
e2ab4353 4004 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
6a026610 4005 (chan->unacked_frames > 0))
1a09bcb9 4006 __set_retrans_timer(chan);
1c2acffb 4007
e2ab4353
GP		 4008 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4009 if (test_bit(CONN_SREJ_SENT, &chan->conn_state))
525cd185 4010 l2cap_send_ack(chan);
894718a6 4011 else
525cd185 4012 l2cap_ertm_send(chan);
e072745f
GP		 4013 }
4014}
2246b2f1 4015
88843ab0 4016static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4017{
0b209fae 4018 u16 tx_seq = __get_reqseq(chan, rx_control);
30afb5b2 4019
88843ab0 4020 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4021
e2ab4353 4022 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
e072745f 4023
42e5c802
GP		 4024 chan->expected_ack_seq = tx_seq;
4025 l2cap_drop_acked_frames(chan);
e072745f 4026
03f6715d 4027 if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4028 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 4029 l2cap_retransmit_frames(chan);
e072745f 4030 } else {
525cd185 4031 l2cap_retransmit_frames(chan);
30afb5b2 4032
e2ab4353
GP		 4033 if (test_bit(CONN_WAIT_F, &chan->conn_state))
4034 set_bit(CONN_REJ_ACT, &chan->conn_state);
e072745f
GP		 4035 }
4036}
88843ab0 4037static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4038{
0b209fae 4039 u16 tx_seq = __get_reqseq(chan, rx_control);
30afb5b2 4040
88843ab0 4041 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4042
e2ab4353 4043 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
2246b2f1 4044
e3781735 4045 if (__is_ctrl_poll(chan, rx_control)) {
42e5c802
GP		 4046 chan->expected_ack_seq = tx_seq;
4047 l2cap_drop_acked_frames(chan);
3cb123d1 4048
e2ab4353 4049 set_bit(CONN_SEND_FBIT, &chan->conn_state);
525cd185 4050 l2cap_retransmit_one_frame(chan, tx_seq);
dfc909be 4051
525cd185 4052 l2cap_ertm_send(chan);
dfc909be 4053
e2ab4353 4054 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
6a026610 4055 chan->srej_save_reqseq = tx_seq;
e2ab4353 4056 set_bit(CONN_SREJ_ACT, &chan->conn_state);
ef54fd93 4057 }
03f6715d 4058 } else if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4059 if (test_bit(CONN_SREJ_ACT, &chan->conn_state) &&
6a026610 4060 chan->srej_save_reqseq == tx_seq)
e2ab4353 4061 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
e072745f 4062 else
525cd185 4063 l2cap_retransmit_one_frame(chan, tx_seq);
e072745f 4064 } else {
525cd185 4065 l2cap_retransmit_one_frame(chan, tx_seq);
e2ab4353 4066 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
6a026610 4067 chan->srej_save_reqseq = tx_seq;
e2ab4353 4068 set_bit(CONN_SREJ_ACT, &chan->conn_state);
ef54fd93 4069 }
e072745f
GP		 4070 }
4071}
4072
88843ab0 4073static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4074{
0b209fae 4075 u16 tx_seq = __get_reqseq(chan, rx_control);
e072745f 4076
88843ab0 4077 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4078
e2ab4353 4079 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
42e5c802
GP		 4080 chan->expected_ack_seq = tx_seq;
4081 l2cap_drop_acked_frames(chan);
e072745f 4082
e3781735 4083 if (__is_ctrl_poll(chan, rx_control))
e2ab4353 4084 set_bit(CONN_SEND_FBIT, &chan->conn_state);
3cb123d1 4085
e2ab4353 4086 if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
1a09bcb9 4087 __clear_retrans_timer(chan);
e3781735 4088 if (__is_ctrl_poll(chan, rx_control))
525cd185 4089 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
99b0d4b7 4090 return;
e072745f 4091 }
99b0d4b7 4092
e3781735 4093 if (__is_ctrl_poll(chan, rx_control)) {
525cd185 4094 l2cap_send_srejtail(chan);
ab784b73
AE		 4095 } else {
4096 rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR);
4097 l2cap_send_sframe(chan, rx_control);
4098 }
e072745f
GP		 4099}
4100
88843ab0 4101static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
e072745f 4102{
88843ab0 4103 BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len);
e072745f 4104
03f6715d 4105 if (__is_ctrl_final(chan, rx_control) &&
e2ab4353 4106 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1a09bcb9 4107 __clear_monitor_timer(chan);
6a026610 4108 if (chan->unacked_frames > 0)
1a09bcb9 4109 __set_retrans_timer(chan);
e2ab4353 4110 clear_bit(CONN_WAIT_F, &chan->conn_state);
e072745f
GP		 4111 }
4112
ab784b73
AE		 4113 switch (__get_ctrl_super(chan, rx_control)) {
4114 case L2CAP_SUPER_RR:
525cd185 4115 l2cap_data_channel_rrframe(chan, rx_control);
8f17154f
GP		 4116 break;
4117
ab784b73 4118 case L2CAP_SUPER_REJ:
525cd185 4119 l2cap_data_channel_rejframe(chan, rx_control);
e072745f 4120 break;
2246b2f1 4121
ab784b73 4122 case L2CAP_SUPER_SREJ:
525cd185 4123 l2cap_data_channel_srejframe(chan, rx_control);
e072745f
GP		 4124 break;
4125
ab784b73 4126 case L2CAP_SUPER_RNR:
525cd185 4127 l2cap_data_channel_rnrframe(chan, rx_control);
1c2acffb
GP		 4128 break;
4129 }
4130
faaebd19 4131 kfree_skb(skb);
1c2acffb
GP		 4132 return 0;
4133}
4134
218bb9df
GP		 4135static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
4136{
525cd185 4137 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
88843ab0 4138 u32 control;
0b209fae 4139 u16 req_seq;
218bb9df
GP		 4140 int len, next_tx_seq_offset, req_seq_offset;
4141
88843ab0
AE		 4142 control = __get_control(chan, skb->data);
4143 skb_pull(skb, __ctrl_size(chan));
218bb9df
GP		 4144 len = skb->len;
4145
4146 /*
4147 * We can just drop the corrupted I-frame here.
4148 * Receiver will miss it and start proper recovery
4149 * procedures and ask retransmission.
4150 */
47d1ec61 4151 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 4152 goto drop;
4153
793c2f1c 4154 if (__is_sar_start(chan, control) && !__is_sframe(chan, control))
03a51213 4155 len -= L2CAP_SDULEN_SIZE;
218bb9df 4156
47d1ec61 4157 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 4158 len -= L2CAP_FCS_SIZE;
218bb9df 4159
47d1ec61 4160 if (len > chan->mps) {
8c1d787b 4161 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4162 goto drop;
4163 }
4164
0b209fae 4165 req_seq = __get_reqseq(chan, control);
218bb9df 4166
836be934
AE		 4167 req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq);
4168
4169 next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq,
4170 chan->expected_ack_seq);
218bb9df
GP		 4171
4172 /* check for invalid req-seq */
4173 if (req_seq_offset > next_tx_seq_offset) {
8c1d787b 4174 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4175 goto drop;
4176 }
4177
793c2f1c 4178 if (!__is_sframe(chan, control)) {
218bb9df 4179 if (len < 0) {
8c1d787b 4180 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4181 goto drop;
4182 }
4183
525cd185 4184 l2cap_data_channel_iframe(chan, control, skb);
218bb9df
GP		 4185 } else {
4186 if (len != 0) {
4187 BT_ERR("%d", len);
8c1d787b 4188 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4189 goto drop;
4190 }
4191
525cd185 4192 l2cap_data_channel_sframe(chan, control, skb);
218bb9df
GP		 4193 }
4194
4195 return 0;
4196
4197drop:
4198 kfree_skb(skb);
4199 return 0;
4200}
4201
1da177e4
LT		 4202static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4203{
48454079 4204 struct l2cap_chan *chan;
bf734843 4205 struct sock *sk = NULL;
88843ab0 4206 u32 control;
fb45de7d 4207 u16 tx_seq;
218bb9df 4208 int len;
1da177e4 4209
baa7e1fa 4210 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 4211 if (!chan) {
1da177e4
LT		 4212 BT_DBG("unknown cid 0x%4.4x", cid);
4213 goto drop;
4214 }
4215
48454079 4216 sk = chan->sk;
6840ed07 4217
49208c9c 4218 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 4219
89bc500e 4220 if (chan->state != BT_CONNECTED)
1da177e4
LT		 4221 goto drop;
4222
0c1bc5c6 4223 switch (chan->mode) {
1c2acffb
GP		 4224 case L2CAP_MODE_BASIC:
4225 /* If socket recv buffers overflows we drop data here
4226 * which is *bad* because L2CAP has to be reliable.
4227 * But we don't have any other choice. L2CAP doesn't
4228 * provide flow control mechanism. */
1da177e4 4229
0c1bc5c6 4230 if (chan->imtu < skb->len)
1c2acffb 4231 goto drop;
1da177e4 4232
23070494 4233 if (!chan->ops->recv(chan->data, skb))
1c2acffb
GP		 4234 goto done;
4235 break;
4236
4237 case L2CAP_MODE_ERTM:
eb403a1b 4238 l2cap_ertm_data_rcv(sk, skb);
1c2acffb 4239
fcafde2e 4240 goto done;
1c2acffb 4241
6840ed07 4242 case L2CAP_MODE_STREAMING:
88843ab0
AE		 4243 control = __get_control(chan, skb->data);
4244 skb_pull(skb, __ctrl_size(chan));
6840ed07
GP		 4245 len = skb->len;
4246
47d1ec61 4247 if (l2cap_check_fcs(chan, skb))
26000089
GP		 4248 goto drop;
4249
7e0ef6ee 4250 if (__is_sar_start(chan, control))
03a51213 4251 len -= L2CAP_SDULEN_SIZE;
6840ed07 4252
47d1ec61 4253 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 4254 len -= L2CAP_FCS_SIZE;
fcc203c3 4255
793c2f1c 4256 if (len > chan->mps || len < 0 || __is_sframe(chan, control))
6840ed07
GP		 4257 goto drop;
4258
fb45de7d 4259 tx_seq = __get_txseq(chan, control);
6840ed07 4260
84084a31
MM		 4261 if (chan->expected_tx_seq != tx_seq) {
4262 /* Frame(s) missing - must discard partial SDU */
4263 kfree_skb(chan->sdu);
4264 chan->sdu = NULL;
4265 chan->sdu_last_frag = NULL;
4266 chan->sdu_len = 0;
6840ed07 4267
84084a31
MM		 4268 /* TODO: Notify userland of missing data */
4269 }
4270
836be934 4271 chan->expected_tx_seq = __next_seq(chan, tx_seq);
84084a31
MM		 4272
4273 if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE)
4274 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
6840ed07
GP		 4275
4276 goto done;
4277
1c2acffb 4278 default:
0c1bc5c6 4279 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 4280 break;
4281 }
1da177e4
LT		 4282
4283drop:
4284 kfree_skb(skb);
4285
4286done:
0139418c 4287 if (sk)
aa2ac881 4288 release_sock(sk);
0139418c 4289
1da177e4
LT		 4290 return 0;
4291}
4292
8e036fc3 4293static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4 4294{
6dcae1ea 4295 struct sock *sk = NULL;
23691d75 4296 struct l2cap_chan *chan;
1da177e4 4297
23691d75
GP		 4298 chan = l2cap_global_chan_by_psm(0, psm, conn->src);
4299 if (!chan)
1da177e4
LT		 4300 goto drop;
4301
23691d75
GP		 4302 sk = chan->sk;
4303
aa2ac881 4304 lock_sock(sk);
e0f0cb56 4305
1da177e4
LT		 4306 BT_DBG("sk %p, len %d", sk, skb->len);
4307
89bc500e 4308 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 4309 goto drop;
4310
e13e21dc 4311 if (chan->imtu < skb->len)
1da177e4
LT		 4312 goto drop;
4313
23070494 4314 if (!chan->ops->recv(chan->data, skb))
1da177e4
LT		 4315 goto done;
4316
4317drop:
4318 kfree_skb(skb);
4319
4320done:
af05b30b 4321 if (sk)
aa2ac881 4322 release_sock(sk);
1da177e4
LT		 4323 return 0;
4324}
4325
9f69bda6
GP		 4326static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb)
4327{
6dcae1ea 4328 struct sock *sk = NULL;
23691d75 4329 struct l2cap_chan *chan;
9f69bda6 4330
23691d75
GP		 4331 chan = l2cap_global_chan_by_scid(0, cid, conn->src);
4332 if (!chan)
9f69bda6
GP		 4333 goto drop;
4334
23691d75
GP		 4335 sk = chan->sk;
4336
aa2ac881 4337 lock_sock(sk);
9f69bda6
GP		 4338
4339 BT_DBG("sk %p, len %d", sk, skb->len);
4340
89bc500e 4341 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 4342 goto drop;
4343
e13e21dc 4344 if (chan->imtu < skb->len)
9f69bda6
GP		 4345 goto drop;
4346
23070494 4347 if (!chan->ops->recv(chan->data, skb))
9f69bda6
GP		 4348 goto done;
4349
4350drop:
4351 kfree_skb(skb);
4352
4353done:
4354 if (sk)
aa2ac881 4355 release_sock(sk);
9f69bda6
GP		 4356 return 0;
4357}
4358
1da177e4
LT		 4359static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4360{
4361 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4362 u16 cid, len;
4363 __le16 psm;
1da177e4
LT		 4364
4365 skb_pull(skb, L2CAP_HDR_SIZE);
4366 cid = __le16_to_cpu(lh->cid);
4367 len = __le16_to_cpu(lh->len);
4368
1c2acffb
GP		 4369 if (len != skb->len) {
4370 kfree_skb(skb);
4371 return;
4372 }
4373
1da177e4
LT		 4374 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4375
4376 switch (cid) {
3300d9a9 4377 case L2CAP_CID_LE_SIGNALING:
8db4dc46 4378 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4379 l2cap_sig_channel(conn, skb);
4380 break;
4381
8db4dc46 4382 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4383 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4384 skb_pull(skb, 2);
4385 l2cap_conless_channel(conn, psm, skb);
4386 break;
4387
9f69bda6
GP		 4388 case L2CAP_CID_LE_DATA:
4389 l2cap_att_channel(conn, cid, skb);
4390 break;
4391
b501d6a1
AB		 4392 case L2CAP_CID_SMP:
4393 if (smp_sig_channel(conn, skb))
4394 l2cap_conn_del(conn->hcon, EACCES);
4395 break;
4396
1da177e4
LT		 4397 default:
4398 l2cap_data_channel(conn, cid, skb);
4399 break;
4400 }
4401}
4402
4403/* ---- L2CAP interface with lower layer (HCI) ---- */
4404
686ebf28 4405int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 4406{
4407 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 4408 struct l2cap_chan *c;
1da177e4 4409
1da177e4
LT		 4410 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4411
4412 /* Find listening sockets and check their link_mode */
23691d75
GP		 4413 read_lock(&chan_list_lock);
4414 list_for_each_entry(c, &chan_list, global_l) {
4415 struct sock *sk = c->sk;
4343478f 4416
89bc500e 4417 if (c->state != BT_LISTEN)
1da177e4
LT		 4418 continue;
4419
4420 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 4421 lm1 |= HCI_LM_ACCEPT;
43bd0f32 4422 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 4423 lm1 |= HCI_LM_MASTER;
1da177e4 4424 exact++;
2af6b9d5
MH		 4425 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4426 lm2 |= HCI_LM_ACCEPT;
43bd0f32 4427 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 4428 lm2 |= HCI_LM_MASTER;
4429 }
1da177e4 4430 }
23691d75 4431 read_unlock(&chan_list_lock);
1da177e4
LT		 4432
4433 return exact ? lm1 : lm2;
4434}
4435
686ebf28 4436int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 4437{
0139418c
MH		 4438 struct l2cap_conn *conn;
4439
1da177e4
LT		 4440 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4441
1da177e4 4442 if (!status) {
1da177e4
LT		 4443 conn = l2cap_conn_add(hcon, status);
4444 if (conn)
4445 l2cap_conn_ready(conn);
0139418c 4446 } else
e175072f 4447 l2cap_conn_del(hcon, bt_to_errno(status));
1da177e4
LT		 4448
4449 return 0;
4450}
4451
686ebf28 4452int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 4453{
4454 struct l2cap_conn *conn = hcon->l2cap_data;
4455
4456 BT_DBG("hcon %p", hcon);
4457
686ebf28 4458 if (!conn)
9f5a0d7b 4459 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 4460 return conn->disc_reason;
4461}
4462
686ebf28 4463int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4464{
4465 BT_DBG("hcon %p reason %d", hcon, reason);
4466
e175072f 4467 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 4468 return 0;
4469}
4470
4343478f 4471static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 4472{
715ec005 4473 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 4474 return;
4475
f62e4323 4476 if (encrypt == 0x00) {
4343478f 4477 if (chan->sec_level == BT_SECURITY_MEDIUM) {
c9b66675 4478 __clear_chan_timer(chan);
f3f668b0 4479 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 4480 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 4481 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 4482 } else {
4343478f 4483 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 4484 __clear_chan_timer(chan);
f62e4323
MH		 4485 }
4486}
4487
686ebf28 4488int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 4489{
0139418c 4490 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 4491 struct l2cap_chan *chan;
1da177e4 4492
0139418c 4493 if (!conn)
1da177e4 4494 return 0;
0139418c 4495
1da177e4
LT		 4496 BT_DBG("conn %p", conn);
4497
160dc6ac
VCG		 4498 if (hcon->type == LE_LINK) {
4499 smp_distribute_keys(conn, 0);
371fd835 4500 __cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 4501 }
4502
3d57dc68 4503 rcu_read_lock();
1da177e4 4504
3d57dc68 4505 list_for_each_entry_rcu(chan, &conn->chan_l, list) {
48454079 4506 struct sock *sk = chan->sk;
baa7e1fa 4507
1da177e4
LT		 4508 bh_lock_sock(sk);
4509
f1cb9af5
VCG		 4510 BT_DBG("chan->scid %d", chan->scid);
4511
4512 if (chan->scid == L2CAP_CID_LE_DATA) {
4513 if (!status && encrypt) {
4514 chan->sec_level = hcon->sec_level;
4515 l2cap_chan_ready(sk);
4516 }
4517
4518 bh_unlock_sock(sk);
4519 continue;
4520 }
4521
c1360a1c 4522 if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
6a8d3010
MH		 4523 bh_unlock_sock(sk);
4524 continue;
4525 }
4526
89bc500e
GP		 4527 if (!status && (chan->state == BT_CONNECTED ||
4528 chan->state == BT_CONFIG)) {
4343478f 4529 l2cap_check_encryption(chan, encrypt);
9719f8af
MH		 4530 bh_unlock_sock(sk);
4531 continue;
4532 }
4533
89bc500e 4534 if (chan->state == BT_CONNECT) {
b1235d79
MH		 4535 if (!status) {
4536 struct l2cap_conn_req req;
fe4128e0
GP		 4537 req.scid = cpu_to_le16(chan->scid);
4538 req.psm = chan->psm;
1da177e4 4539
fc7f8a7e 4540 chan->ident = l2cap_get_ident(conn);
c1360a1c 4541 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4 4542
fc7f8a7e 4543 l2cap_send_cmd(conn, chan->ident,
b1235d79
MH		 4544 L2CAP_CONN_REQ, sizeof(req), &req);
4545 } else {
c9b66675 4546 __clear_chan_timer(chan);
f3f668b0 4547 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 4548 }
89bc500e 4549 } else if (chan->state == BT_CONNECT2) {
b1235d79 4550 struct l2cap_conn_rsp rsp;
df3c3931 4551 __u16 res, stat;
1da177e4 4552
b1235d79 4553 if (!status) {
df3c3931
JH		 4554 if (bt_sk(sk)->defer_setup) {
4555 struct sock *parent = bt_sk(sk)->parent;
4556 res = L2CAP_CR_PEND;
4557 stat = L2CAP_CS_AUTHOR_PEND;
05e9a2f6
IK		 4558 if (parent)
4559 parent->sk_data_ready(parent, 0);
df3c3931 4560 } else {
05558911 4561 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 4562 res = L2CAP_CR_SUCCESS;
4563 stat = L2CAP_CS_NO_INFO;
4564 }
b1235d79 4565 } else {
89bc500e 4566 l2cap_state_change(chan, BT_DISCONN);
f3f668b0 4567 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 4568 res = L2CAP_CR_SEC_BLOCK;
4569 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 4570 }
4571
fe4128e0
GP		 4572 rsp.scid = cpu_to_le16(chan->dcid);
4573 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 4574 rsp.result = cpu_to_le16(res);
4575 rsp.status = cpu_to_le16(stat);
fc7f8a7e
GP		 4576 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
4577 sizeof(rsp), &rsp);
b1235d79 4578 }
1da177e4
LT		 4579
4580 bh_unlock_sock(sk);
4581 }
4582
3d57dc68 4583 rcu_read_unlock();
b1235d79 4584
1da177e4
LT		 4585 return 0;
4586}
4587
686ebf28 4588int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 4589{
4590 struct l2cap_conn *conn = hcon->l2cap_data;
4591
5a08ecce
AE		 4592 if (!conn)
4593 conn = l2cap_conn_add(hcon, 0);
4594
4595 if (!conn)
1da177e4
LT		 4596 goto drop;
4597
4598 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4599
e702112f 4600 if (!(flags & ACL_CONT)) {
1da177e4 4601 struct l2cap_hdr *hdr;
48454079 4602 struct l2cap_chan *chan;
89794813 4603 u16 cid;
1da177e4
LT		 4604 int len;
4605
4606 if (conn->rx_len) {
4607 BT_ERR("Unexpected start frame (len %d)", skb->len);
4608 kfree_skb(conn->rx_skb);
4609 conn->rx_skb = NULL;
4610 conn->rx_len = 0;
4611 l2cap_conn_unreliable(conn, ECOMM);
4612 }
4613
aae7fe22
AE		 4614 /* Start fragment always begin with Basic L2CAP header */
4615 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 4616 BT_ERR("Frame is too short (len %d)", skb->len);
4617 l2cap_conn_unreliable(conn, ECOMM);
4618 goto drop;
4619 }
4620
4621 hdr = (struct l2cap_hdr *) skb->data;
4622 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
89794813 4623 cid = __le16_to_cpu(hdr->cid);
1da177e4
LT		 4624
4625 if (len == skb->len) {
4626 /* Complete frame received */
4627 l2cap_recv_frame(conn, skb);
4628 return 0;
4629 }
4630
4631 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4632
4633 if (skb->len > len) {
4634 BT_ERR("Frame is too long (len %d, expected len %d)",
4635 skb->len, len);
4636 l2cap_conn_unreliable(conn, ECOMM);
4637 goto drop;
4638 }
4639
baa7e1fa 4640 chan = l2cap_get_chan_by_scid(conn, cid);
89794813 4641
48454079
GP		 4642 if (chan && chan->sk) {
4643 struct sock *sk = chan->sk;
89794813 4644
0c1bc5c6 4645 if (chan->imtu < len - L2CAP_HDR_SIZE) {
48454079
GP		 4646 BT_ERR("Frame exceeding recv MTU (len %d, "
4647 "MTU %d)", len,
0c1bc5c6 4648 chan->imtu);
aa2ac881 4649 release_sock(sk);
48454079
GP		 4650 l2cap_conn_unreliable(conn, ECOMM);
4651 goto drop;
4652 }
aa2ac881 4653 release_sock(sk);
48454079 4654 }
89794813 4655
1da177e4 4656 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4657 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4658 if (!conn->rx_skb)
1da177e4
LT		 4659 goto drop;
4660
d626f62b 4661 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4662 skb->len);
1da177e4
LT		 4663 conn->rx_len = len - skb->len;
4664 } else {
4665 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4666
4667 if (!conn->rx_len) {
4668 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4669 l2cap_conn_unreliable(conn, ECOMM);
4670 goto drop;
4671 }
4672
4673 if (skb->len > conn->rx_len) {
4674 BT_ERR("Fragment is too long (len %d, expected %d)",
4675 skb->len, conn->rx_len);
4676 kfree_skb(conn->rx_skb);
4677 conn->rx_skb = NULL;
4678 conn->rx_len = 0;
4679 l2cap_conn_unreliable(conn, ECOMM);
4680 goto drop;
4681 }
4682
d626f62b 4683 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4684 skb->len);
1da177e4
LT		 4685 conn->rx_len -= skb->len;
4686
4687 if (!conn->rx_len) {
4688 /* Complete frame received */
4689 l2cap_recv_frame(conn, conn->rx_skb);
4690 conn->rx_skb = NULL;
4691 }
4692 }
4693
4694drop:
4695 kfree_skb(skb);
4696 return 0;
4697}
4698
aef7d97c 4699static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 4700{
23691d75 4701 struct l2cap_chan *c;
1da177e4 4702
23691d75 4703 read_lock_bh(&chan_list_lock);
1da177e4 4704
23691d75
GP		 4705 list_for_each_entry(c, &chan_list, global_l) {
4706 struct sock *sk = c->sk;
101545f6 4707
903d343e 4708 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
aef7d97c
MH		 4709 batostr(&bt_sk(sk)->src),
4710 batostr(&bt_sk(sk)->dst),
89bc500e 4711 c->state, __le16_to_cpu(c->psm),
23691d75
GP		 4712 c->scid, c->dcid, c->imtu, c->omtu,
4713 c->sec_level, c->mode);
05558911 4714}
1da177e4 4715
23691d75 4716 read_unlock_bh(&chan_list_lock);
1da177e4 4717
aef7d97c 4718 return 0;
1da177e4
LT		 4719}
4720
aef7d97c
MH		 4721static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4722{
4723 return single_open(file, l2cap_debugfs_show, inode->i_private);
4724}
4725
4726static const struct file_operations l2cap_debugfs_fops = {
4727 .open = l2cap_debugfs_open,
4728 .read = seq_read,
4729 .llseek = seq_lseek,
4730 .release = single_release,
4731};
4732
4733static struct dentry *l2cap_debugfs;
1da177e4 4734
64274518 4735int __init l2cap_init(void)
1da177e4
LT		 4736{
4737 int err;
be9d1227 4738
bb58f747 4739 err = l2cap_init_sockets();
1da177e4
LT		 4740 if (err < 0)
4741 return err;
4742
aef7d97c
MH		 4743 if (bt_debugfs) {
4744 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4745 bt_debugfs, NULL, &l2cap_debugfs_fops);
4746 if (!l2cap_debugfs)
4747 BT_ERR("Failed to create L2CAP debug file");
4748 }
1da177e4 4749
1da177e4 4750 return 0;
1da177e4
LT		 4751}
4752
64274518 4753void l2cap_exit(void)
1da177e4 4754{
aef7d97c 4755 debugfs_remove(l2cap_debugfs);
bb58f747 4756 l2cap_cleanup_sockets();
1da177e4
LT		 4757}
4758
d1c4a17d
GP		 4759module_param(disable_ertm, bool, 0644);
4760MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)