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Bluetooth: Fix a compile warning in 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
2fb9b3d4
GP		 1988 BT_DBG("chan %p", chan);
1989
721c4181 1990 lock_sock(chan->sk);
525cd185 1991 l2cap_send_ack(chan);
721c4181 1992 release_sock(chan->sk);
c1b4f43b
GP		 1993}
1994
525cd185 1995static inline void l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 1996{
42e5c802 1997 chan->expected_ack_seq = 0;
6a026610 1998 chan->unacked_frames = 0;
42e5c802 1999 chan->buffer_seq = 0;
6a026610
GP		 2000 chan->num_acked = 0;
2001 chan->frames_sent = 0;
0565c1c2 2002
721c4181
GP		 2003 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
2004 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
2005 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
0565c1c2 2006
f1c6775b 2007 skb_queue_head_init(&chan->srej_q);
1890d36b 2008
39d5a3ee 2009 INIT_LIST_HEAD(&chan->srej_l);
0565c1c2
GP		 2010}
2011
f2fcfcd6
GP		 2012static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2013{
2014 switch (mode) {
2015 case L2CAP_MODE_STREAMING:
2016 case L2CAP_MODE_ERTM:
2017 if (l2cap_mode_supported(mode, remote_feat_mask))
2018 return mode;
2019 /* fall through */
2020 default:
2021 return L2CAP_MODE_BASIC;
2022 }
2023}
2024
6327eb98
AE		 2025static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
2026{
2027 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
2028}
2029
f89cef09
AE		 2030static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
2031{
2032 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
2033}
2034
6327eb98
AE		 2035static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
2036{
2037 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
836be934 2038 __l2cap_ews_supported(chan)) {
6327eb98
AE		 2039 /* use extended control field */
2040 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 2041 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
2042 } else {
6327eb98
AE		 2043 chan->tx_win = min_t(u16, chan->tx_win,
2044 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 2045 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
2046 }
6327eb98
AE		 2047}
2048
710f9b0a 2049static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2050{
1da177e4 2051 struct l2cap_conf_req *req = data;
0c1bc5c6 2052 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 2053 void *ptr = req->data;
c8f79162 2054 u16 size;
1da177e4 2055
49208c9c 2056 BT_DBG("chan %p", chan);
1da177e4 2057
73ffa904 2058 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 2059 goto done;
2060
0c1bc5c6 2061 switch (chan->mode) {
f2fcfcd6
GP		 2062 case L2CAP_MODE_STREAMING:
2063 case L2CAP_MODE_ERTM:
c1360a1c 2064 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 2065 break;
85eb53c6 2066
f89cef09
AE		 2067 if (__l2cap_efs_supported(chan))
2068 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2069
2ba13ed6 2070 /* fall through */
f2fcfcd6 2071 default:
8c1d787b 2072 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 2073 break;
2074 }
2075
2076done:
0c1bc5c6
GP		 2077 if (chan->imtu != L2CAP_DEFAULT_MTU)
2078 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 2079
0c1bc5c6 2080 switch (chan->mode) {
65c7c491 2081 case L2CAP_MODE_BASIC:
8c1d787b
GP		 2082 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2083 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 2084 break;
2085
62547752
GP		 2086 rfc.mode = L2CAP_MODE_BASIC;
2087 rfc.txwin_size = 0;
2088 rfc.max_transmit = 0;
2089 rfc.retrans_timeout = 0;
2090 rfc.monitor_timeout = 0;
2091 rfc.max_pdu_size = 0;
2092
63406504
GP		 2093 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2094 (unsigned long) &rfc);
65c7c491
MH		 2095 break;
2096
2097 case L2CAP_MODE_ERTM:
2098 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 2099 rfc.max_transmit = chan->max_tx;
f2fcfcd6
GP		 2100 rfc.retrans_timeout = 0;
2101 rfc.monitor_timeout = 0;
c8f79162
AE		 2102
2103 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2104 L2CAP_EXT_HDR_SIZE -
2105 L2CAP_SDULEN_SIZE -
2106 L2CAP_FCS_SIZE);
2107 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 2108
6327eb98
AE		 2109 l2cap_txwin_setup(chan);
2110
2111 rfc.txwin_size = min_t(u16, chan->tx_win,
2112 L2CAP_DEFAULT_TX_WINDOW);
f2fcfcd6 2113
63406504
GP		 2114 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2115 (unsigned long) &rfc);
2116
f89cef09
AE		 2117 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2118 l2cap_add_opt_efs(&ptr, chan);
2119
8c1d787b 2120 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2121 break;
2122
47d1ec61 2123 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2124 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2125 chan->fcs = L2CAP_FCS_NONE;
2126 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2127 }
6327eb98
AE		 2128
2129 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2130 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2131 chan->tx_win);
f2fcfcd6
GP		 2132 break;
2133
2134 case L2CAP_MODE_STREAMING:
2135 rfc.mode = L2CAP_MODE_STREAMING;
2136 rfc.txwin_size = 0;
2137 rfc.max_transmit = 0;
2138 rfc.retrans_timeout = 0;
2139 rfc.monitor_timeout = 0;
c8f79162
AE		 2140
2141 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2142 L2CAP_EXT_HDR_SIZE -
2143 L2CAP_SDULEN_SIZE -
2144 L2CAP_FCS_SIZE);
2145 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 2146
63406504
GP		 2147 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2148 (unsigned long) &rfc);
2149
f89cef09
AE		 2150 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2151 l2cap_add_opt_efs(&ptr, chan);
2152
8c1d787b 2153 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2154 break;
2155
47d1ec61 2156 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2157 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2158 chan->fcs = L2CAP_FCS_NONE;
2159 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2160 }
65c7c491
MH		 2161 break;
2162 }
1da177e4 2163
fe4128e0 2164 req->dcid = cpu_to_le16(chan->dcid);
aca3192c 2165 req->flags = cpu_to_le16(0);
1da177e4
LT		 2166
2167 return ptr - data;
2168}
2169
73ffa904 2170static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2171{
5dee9e7c
MH		 2172 struct l2cap_conf_rsp *rsp = data;
2173 void *ptr = rsp->data;
73ffa904
GP		 2174 void *req = chan->conf_req;
2175 int len = chan->conf_len;
5dee9e7c
MH		 2176 int type, hint, olen;
2177 unsigned long val;
6464f35f 2178 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 2179 struct l2cap_conf_efs efs;
2180 u8 remote_efs = 0;
861d6882 2181 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2182 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 2183 u16 size;
1da177e4 2184
73ffa904 2185 BT_DBG("chan %p", chan);
820ae1b8 2186
5dee9e7c
MH		 2187 while (len >= L2CAP_CONF_OPT_SIZE) {
2188 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2189
589d2746 2190 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2191 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2192
2193 switch (type) {
2194 case L2CAP_CONF_MTU:
861d6882 2195 mtu = val;
5dee9e7c
MH		 2196 break;
2197
2198 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2199 chan->flush_to = val;
5dee9e7c
MH		 2200 break;
2201
2202 case L2CAP_CONF_QOS:
2203 break;
2204
6464f35f
MH		 2205 case L2CAP_CONF_RFC:
2206 if (olen == sizeof(rfc))
2207 memcpy(&rfc, (void *) val, olen);
2208 break;
2209
fcc203c3
GP		 2210 case L2CAP_CONF_FCS:
2211 if (val == L2CAP_FCS_NONE)
c1360a1c 2212 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 2213 break;
fcc203c3 2214
42dceae2
AE		 2215 case L2CAP_CONF_EFS:
2216 remote_efs = 1;
2217 if (olen == sizeof(efs))
2218 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 2219 break;
2220
6327eb98
AE		 2221 case L2CAP_CONF_EWS:
2222 if (!enable_hs)
2223 return -ECONNREFUSED;
fcc203c3 2224
6327eb98
AE		 2225 set_bit(FLAG_EXT_CTRL, &chan->flags);
2226 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 2227 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98 2228 chan->remote_tx_win = val;
fcc203c3
GP		 2229 break;
2230
5dee9e7c
MH		 2231 default:
2232 if (hint)
2233 break;
2234
2235 result = L2CAP_CONF_UNKNOWN;
2236 *((u8 *) ptr++) = type;
2237 break;
2238 }
2239 }
2240
73ffa904 2241 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 2242 goto done;
2243
0c1bc5c6 2244 switch (chan->mode) {
f2fcfcd6
GP		 2245 case L2CAP_MODE_STREAMING:
2246 case L2CAP_MODE_ERTM:
c1360a1c 2247 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 2248 chan->mode = l2cap_select_mode(rfc.mode,
8c1d787b 2249 chan->conn->feat_mask);
85eb53c6
GP		 2250 break;
2251 }
2252
42dceae2
AE		 2253 if (remote_efs) {
2254 if (__l2cap_efs_supported(chan))
2255 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2256 else
2257 return -ECONNREFUSED;
2258 }
2259
0c1bc5c6 2260 if (chan->mode != rfc.mode)
f2fcfcd6 2261 return -ECONNREFUSED;
742e519b 2262
f2fcfcd6 2263 break;
f2fcfcd6
GP		 2264 }
2265
2266done:
0c1bc5c6 2267 if (chan->mode != rfc.mode) {
f2fcfcd6 2268 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2269 rfc.mode = chan->mode;
f2fcfcd6 2270
73ffa904 2271 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 2272 return -ECONNREFUSED;
2273
2274 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2275 sizeof(rfc), (unsigned long) &rfc);
2276 }
2277
5dee9e7c
MH		 2278 if (result == L2CAP_CONF_SUCCESS) {
2279 /* Configure output options and let the other side know
2280 * which ones we don't like. */
2281
f2fcfcd6
GP		 2282 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2283 result = L2CAP_CONF_UNACCEPT;
2284 else {
0c1bc5c6 2285 chan->omtu = mtu;
c1360a1c 2286 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 2287 }
0c1bc5c6 2288 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 2289
42dceae2
AE		 2290 if (remote_efs) {
2291 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2292 efs.stype != L2CAP_SERV_NOTRAFIC &&
2293 efs.stype != chan->local_stype) {
2294
2295 result = L2CAP_CONF_UNACCEPT;
2296
2297 if (chan->num_conf_req >= 1)
2298 return -ECONNREFUSED;
2299
2300 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3e6b3b95 2301 sizeof(efs),
42dceae2 2302 (unsigned long) &efs);
0e8b207e 2303 } else {
3e6b3b95 2304 /* Send PENDING Conf Rsp */
0e8b207e
AE		 2305 result = L2CAP_CONF_PENDING;
2306 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 2307 }
2308 }
2309
f2fcfcd6
GP		 2310 switch (rfc.mode) {
2311 case L2CAP_MODE_BASIC:
47d1ec61 2312 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 2313 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 2314 break;
2315
2316 case L2CAP_MODE_ERTM:
6327eb98
AE		 2317 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
2318 chan->remote_tx_win = rfc.txwin_size;
2319 else
2320 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
86b1b263 2321
2c03a7a4 2322 chan->remote_max_tx = rfc.max_transmit;
1c762159 2323
c8f79162
AE		 2324 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2325 chan->conn->mtu -
2326 L2CAP_EXT_HDR_SIZE -
2327 L2CAP_SDULEN_SIZE -
2328 L2CAP_FCS_SIZE);
2329 rfc.max_pdu_size = cpu_to_le16(size);
2330 chan->remote_mps = size;
f2fcfcd6 2331
10467e9e
GP		 2332 rfc.retrans_timeout =
2333 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2334 rfc.monitor_timeout =
2335 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6 2336
c1360a1c 2337 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 2338
2339 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2340 sizeof(rfc), (unsigned long) &rfc);
2341
42dceae2
AE		 2342 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2343 chan->remote_id = efs.id;
2344 chan->remote_stype = efs.stype;
2345 chan->remote_msdu = le16_to_cpu(efs.msdu);
2346 chan->remote_flush_to =
2347 le32_to_cpu(efs.flush_to);
2348 chan->remote_acc_lat =
2349 le32_to_cpu(efs.acc_lat);
2350 chan->remote_sdu_itime =
2351 le32_to_cpu(efs.sdu_itime);
2352 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2353 sizeof(efs), (unsigned long) &efs);
2354 }
f2fcfcd6
GP		 2355 break;
2356
2357 case L2CAP_MODE_STREAMING:
c8f79162
AE		 2358 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2359 chan->conn->mtu -
2360 L2CAP_EXT_HDR_SIZE -
2361 L2CAP_SDULEN_SIZE -
2362 L2CAP_FCS_SIZE);
2363 rfc.max_pdu_size = cpu_to_le16(size);
2364 chan->remote_mps = size;
f2fcfcd6 2365
c1360a1c 2366 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 2367
2368 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2369 sizeof(rfc), (unsigned long) &rfc);
2370
f2fcfcd6
GP		 2371 break;
2372
2373 default:
5dee9e7c 2374 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2375
6464f35f 2376 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 2377 rfc.mode = chan->mode;
f2fcfcd6 2378 }
6464f35f 2379
f2fcfcd6 2380 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 2381 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 2382 }
fe4128e0 2383 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c
MH		 2384 rsp->result = cpu_to_le16(result);
2385 rsp->flags = cpu_to_le16(0x0000);
2386
2387 return ptr - data;
1da177e4
LT		 2388}
2389
b4450035 2390static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
f2fcfcd6 2391{
f2fcfcd6
GP		 2392 struct l2cap_conf_req *req = data;
2393 void *ptr = req->data;
2394 int type, olen;
2395 unsigned long val;
36e999a8 2396 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
66af7aaf 2397 struct l2cap_conf_efs efs;
f2fcfcd6 2398
fe4128e0 2399 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 2400
2401 while (len >= L2CAP_CONF_OPT_SIZE) {
2402 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2403
2404 switch (type) {
2405 case L2CAP_CONF_MTU:
2406 if (val < L2CAP_DEFAULT_MIN_MTU) {
2407 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2408 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 2409 } else
0c1bc5c6
GP		 2410 chan->imtu = val;
2411 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 2412 break;
2413
2414 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2415 chan->flush_to = val;
f2fcfcd6 2416 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
0c1bc5c6 2417 2, chan->flush_to);
f2fcfcd6
GP		 2418 break;
2419
2420 case L2CAP_CONF_RFC:
2421 if (olen == sizeof(rfc))
2422 memcpy(&rfc, (void *)val, olen);
2423
c1360a1c 2424 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
0c1bc5c6 2425 rfc.mode != chan->mode)
f2fcfcd6
GP		 2426 return -ECONNREFUSED;
2427
47d1ec61 2428 chan->fcs = 0;
f2fcfcd6
GP		 2429
2430 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2431 sizeof(rfc), (unsigned long) &rfc);
2432 break;
6327eb98
AE		 2433
2434 case L2CAP_CONF_EWS:
2435 chan->tx_win = min_t(u16, val,
2436 L2CAP_DEFAULT_EXT_WINDOW);
3e6b3b95
GP		 2437 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2438 chan->tx_win);
6327eb98 2439 break;
66af7aaf
AE		 2440
2441 case L2CAP_CONF_EFS:
2442 if (olen == sizeof(efs))
2443 memcpy(&efs, (void *)val, olen);
2444
2445 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2446 efs.stype != L2CAP_SERV_NOTRAFIC &&
2447 efs.stype != chan->local_stype)
2448 return -ECONNREFUSED;
2449
2450 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2451 sizeof(efs), (unsigned long) &efs);
2452 break;
f2fcfcd6
GP		 2453 }
2454 }
2455
0c1bc5c6 2456 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 2457 return -ECONNREFUSED;
2458
0c1bc5c6 2459 chan->mode = rfc.mode;
6c2ea7a8 2460
0e8b207e 2461 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 2462 switch (rfc.mode) {
2463 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2464 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2465 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2466 chan->mps = le16_to_cpu(rfc.max_pdu_size);
66af7aaf
AE		 2467
2468 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2469 chan->local_msdu = le16_to_cpu(efs.msdu);
2470 chan->local_sdu_itime =
2471 le32_to_cpu(efs.sdu_itime);
2472 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
2473 chan->local_flush_to =
2474 le32_to_cpu(efs.flush_to);
2475 }
f2fcfcd6 2476 break;
66af7aaf 2477
f2fcfcd6 2478 case L2CAP_MODE_STREAMING:
47d1ec61 2479 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2480 }
2481 }
2482
fe4128e0 2483 req->dcid = cpu_to_le16(chan->dcid);
f2fcfcd6
GP		 2484 req->flags = cpu_to_le16(0x0000);
2485
2486 return ptr - data;
2487}
2488
fe4128e0 2489static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1da177e4
LT		 2490{
2491 struct l2cap_conf_rsp *rsp = data;
2492 void *ptr = rsp->data;
1da177e4 2493
fe4128e0 2494 BT_DBG("chan %p", chan);
1da177e4 2495
fe4128e0 2496 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 2497 rsp->result = cpu_to_le16(result);
aca3192c 2498 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2499
2500 return ptr - data;
2501}
2502
8c1d787b 2503void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 2504{
2505 struct l2cap_conn_rsp rsp;
8c1d787b 2506 struct l2cap_conn *conn = chan->conn;
710f9b0a
GP		 2507 u8 buf[128];
2508
fe4128e0
GP		 2509 rsp.scid = cpu_to_le16(chan->dcid);
2510 rsp.dcid = cpu_to_le16(chan->scid);
710f9b0a
GP		 2511 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
2512 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
2513 l2cap_send_cmd(conn, chan->ident,
2514 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2515
c1360a1c 2516 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 2517 return;
2518
710f9b0a
GP		 2519 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2520 l2cap_build_conf_req(chan, buf), buf);
2521 chan->num_conf_req++;
2522}
2523
47d1ec61 2524static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 2525{
7b1c0049
GP		 2526 int type, olen;
2527 unsigned long val;
2528 struct l2cap_conf_rfc rfc;
2529
47d1ec61 2530 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 2531
0c1bc5c6 2532 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 2533 return;
2534
2535 while (len >= L2CAP_CONF_OPT_SIZE) {
2536 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2537
2538 switch (type) {
2539 case L2CAP_CONF_RFC:
2540 if (olen == sizeof(rfc))
2541 memcpy(&rfc, (void *)val, olen);
2542 goto done;
2543 }
2544 }
2545
36e999a8
MM		 2546 /* Use sane default values in case a misbehaving remote device
2547 * did not send an RFC option.
2548 */
2549 rfc.mode = chan->mode;
2550 rfc.retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
2551 rfc.monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
2552 rfc.max_pdu_size = cpu_to_le16(chan->imtu);
2553
2554 BT_ERR("Expected RFC option was not found, using defaults");
2555
7b1c0049
GP		 2556done:
2557 switch (rfc.mode) {
2558 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2559 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2560 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2561 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2562 break;
2563 case L2CAP_MODE_STREAMING:
47d1ec61 2564 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2565 }
2566}
2567
4e8402a3
MH		 2568static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2569{
e2fd318e 2570 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 2571
e2fd318e 2572 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 2573 return 0;
2574
2575 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2576 cmd->ident == conn->info_ident) {
371fd835 2577 __cancel_delayed_work(&conn->info_timer);
984947dc
MH		 2578
2579 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2580 conn->info_ident = 0;
984947dc 2581
4e8402a3
MH		 2582 l2cap_conn_start(conn);
2583 }
2584
2585 return 0;
2586}
2587
1da177e4
LT		 2588static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2589{
1da177e4
LT		 2590 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2591 struct l2cap_conn_rsp rsp;
23691d75 2592 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 2593 struct sock *parent, *sk = NULL;
e7c29cb1 2594 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2595
2596 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2597 __le16 psm = req->psm;
1da177e4
LT		 2598
2599 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2600
2601 /* Check if we have socket listening on psm */
23691d75
GP		 2602 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src);
2603 if (!pchan) {
1da177e4
LT		 2604 result = L2CAP_CR_BAD_PSM;
2605 goto sendresp;
2606 }
2607
23691d75
GP		 2608 parent = pchan->sk;
2609
aa2ac881 2610 lock_sock(parent);
e0f0cb56 2611
e7c29cb1
MH		 2612 /* Check if the ACL is secure enough (if not SDP) */
2613 if (psm != cpu_to_le16(0x0001) &&
2614 !hci_conn_check_link_mode(conn->hcon)) {
9f5a0d7b 2615 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
e7c29cb1
MH		 2616 result = L2CAP_CR_SEC_BLOCK;
2617 goto response;
2618 }
2619
1da177e4
LT		 2620 result = L2CAP_CR_NO_MEM;
2621
2622 /* Check for backlog size */
2623 if (sk_acceptq_is_full(parent)) {
8e87d142 2624 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2625 goto response;
2626 }
2627
80808e43
GP		 2628 chan = pchan->ops->new_connection(pchan->data);
2629 if (!chan)
1da177e4
LT		 2630 goto response;
2631
80808e43
GP		 2632 sk = chan->sk;
2633
1da177e4 2634 /* Check if we already have channel with that dcid */
baa7e1fa 2635 if (__l2cap_get_chan_by_dcid(conn, scid)) {
1da177e4 2636 sock_set_flag(sk, SOCK_ZAPPED);
ba3bd0ee 2637 chan->ops->close(chan->data);
1da177e4
LT		 2638 goto response;
2639 }
2640
2641 hci_conn_hold(conn->hcon);
2642
1da177e4
LT		 2643 bacpy(&bt_sk(sk)->src, conn->src);
2644 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 2645 chan->psm = psm;
2646 chan->dcid = scid;
1da177e4 2647
d1010240
GP		 2648 bt_accept_enqueue(parent, sk);
2649
3d57dc68 2650 l2cap_chan_add(conn, chan);
48454079 2651
fe4128e0 2652 dcid = chan->scid;
1da177e4 2653
c9b66675 2654 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 2655
fc7f8a7e 2656 chan->ident = cmd->ident;
1da177e4 2657
984947dc 2658 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
d45fc423 2659 if (l2cap_chan_check_security(chan)) {
f66dc81f 2660 if (bt_sk(sk)->defer_setup) {
89bc500e 2661 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 2662 result = L2CAP_CR_PEND;
2663 status = L2CAP_CS_AUTHOR_PEND;
2664 parent->sk_data_ready(parent, 0);
2665 } else {
89bc500e 2666 l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 2667 result = L2CAP_CR_SUCCESS;
2668 status = L2CAP_CS_NO_INFO;
2669 }
79d554a6 2670 } else {
89bc500e 2671 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 2672 result = L2CAP_CR_PEND;
2673 status = L2CAP_CS_AUTHEN_PEND;
2674 }
2675 } else {
89bc500e 2676 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 2677 result = L2CAP_CR_PEND;
2678 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2679 }
2680
1da177e4 2681response:
aa2ac881 2682 release_sock(parent);
1da177e4
LT		 2683
2684sendresp:
aca3192c
YH		 2685 rsp.scid = cpu_to_le16(scid);
2686 rsp.dcid = cpu_to_le16(dcid);
2687 rsp.result = cpu_to_le16(result);
2688 rsp.status = cpu_to_le16(status);
1da177e4 2689 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2690
2691 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2692 struct l2cap_info_req info;
2693 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2694
2695 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2696 conn->info_ident = l2cap_get_ident(conn);
2697
030013d8 2698 schedule_delayed_work(&conn->info_timer,
79d554a6
MH		 2699 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2700
2701 l2cap_send_cmd(conn, conn->info_ident,
2702 L2CAP_INFO_REQ, sizeof(info), &info);
2703 }
2704
c1360a1c 2705 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
e9aeb2dd
GP		 2706 result == L2CAP_CR_SUCCESS) {
2707 u8 buf[128];
c1360a1c 2708 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 2709 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2710 l2cap_build_conf_req(chan, buf), buf);
2711 chan->num_conf_req++;
e9aeb2dd
GP		 2712 }
2713
1da177e4
LT		 2714 return 0;
2715}
2716
2717static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2718{
2719 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2720 u16 scid, dcid, result, status;
48454079 2721 struct l2cap_chan *chan;
1da177e4
LT		 2722 struct sock *sk;
2723 u8 req[128];
2724
2725 scid = __le16_to_cpu(rsp->scid);
2726 dcid = __le16_to_cpu(rsp->dcid);
2727 result = __le16_to_cpu(rsp->result);
2728 status = __le16_to_cpu(rsp->status);
2729
2730 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2731
2732 if (scid) {
baa7e1fa 2733 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2734 if (!chan)
57d3b22b 2735 return -EFAULT;
1da177e4 2736 } else {
baa7e1fa 2737 chan = l2cap_get_chan_by_ident(conn, cmd->ident);
48454079 2738 if (!chan)
57d3b22b 2739 return -EFAULT;
1da177e4
LT		 2740 }
2741
48454079
GP		 2742 sk = chan->sk;
2743
1da177e4
LT		 2744 switch (result) {
2745 case L2CAP_CR_SUCCESS:
89bc500e 2746 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 2747 chan->ident = 0;
fe4128e0 2748 chan->dcid = dcid;
c1360a1c 2749 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 2750
c1360a1c 2751 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 2752 break;
2753
1da177e4 2754 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2755 l2cap_build_conf_req(chan, req), req);
2756 chan->num_conf_req++;
1da177e4
LT		 2757 break;
2758
2759 case L2CAP_CR_PEND:
c1360a1c 2760 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 2761 break;
2762
2763 default:
48454079 2764 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 2765 break;
2766 }
2767
aa2ac881 2768 release_sock(sk);
1da177e4
LT		 2769 return 0;
2770}
2771
47d1ec61 2772static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 2773{
2774 /* FCS is enabled only in ERTM or streaming mode, if one or both
2775 * sides request it.
2776 */
0c1bc5c6 2777 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 2778 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 2779 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 2780 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 2781}
2782
88219a0f 2783static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 2784{
2785 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2786 u16 dcid, flags;
2787 u8 rsp[64];
48454079 2788 struct l2cap_chan *chan;
1da177e4 2789 struct sock *sk;
5dee9e7c 2790 int len;
1da177e4
LT		 2791
2792 dcid = __le16_to_cpu(req->dcid);
2793 flags = __le16_to_cpu(req->flags);
2794
2795 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2796
baa7e1fa 2797 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 2798 if (!chan)
1da177e4
LT		 2799 return -ENOENT;
2800
48454079
GP		 2801 sk = chan->sk;
2802
033b1142 2803 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 2804 struct l2cap_cmd_rej_cid rej;
2805
2806 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
2807 rej.scid = cpu_to_le16(chan->scid);
2808 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 2809
df6bd743
GP		 2810 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2811 sizeof(rej), &rej);
354f60a9 2812 goto unlock;
df6bd743 2813 }
354f60a9 2814
5dee9e7c 2815 /* Reject if config buffer is too small. */
88219a0f 2816 len = cmd_len - sizeof(*req);
7ac28817 2817 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 2818 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 2819 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c
MH		 2820 L2CAP_CONF_REJECT, flags), rsp);
2821 goto unlock;
2822 }
2823
2824 /* Store config. */
73ffa904
GP		 2825 memcpy(chan->conf_req + chan->conf_len, req->data, len);
2826 chan->conf_len += len;
1da177e4
LT		 2827
2828 if (flags & 0x0001) {
2829 /* Incomplete config. Send empty response. */
2830 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 2831 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c 2832 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 2833 goto unlock;
2834 }
2835
2836 /* Complete config. */
73ffa904 2837 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 2838 if (len < 0) {
e92c8e70 2839 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 2840 goto unlock;
f2fcfcd6 2841 }
1da177e4 2842
5dee9e7c 2843 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 2844 chan->num_conf_rsp++;
5dee9e7c 2845
5dee9e7c 2846 /* Reset config buffer. */
73ffa904 2847 chan->conf_len = 0;
5dee9e7c 2848
c1360a1c 2849 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 2850 goto unlock;
2851
c1360a1c 2852 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 2853 set_default_fcs(chan);
fcc203c3 2854
89bc500e 2855 l2cap_state_change(chan, BT_CONNECTED);
e90bac06 2856
42e5c802
GP		 2857 chan->next_tx_seq = 0;
2858 chan->expected_tx_seq = 0;
58d35f87 2859 skb_queue_head_init(&chan->tx_q);
0c1bc5c6 2860 if (chan->mode == L2CAP_MODE_ERTM)
525cd185 2861 l2cap_ertm_init(chan);
0565c1c2 2862
1da177e4 2863 l2cap_chan_ready(sk);
876d9484
MH		 2864 goto unlock;
2865 }
2866
c1360a1c 2867 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 2868 u8 buf[64];
1da177e4 2869 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2870 l2cap_build_conf_req(chan, buf), buf);
2871 chan->num_conf_req++;
1da177e4
LT		 2872 }
2873
0e8b207e
AE		 2874 /* Got Conf Rsp PENDING from remote side and asume we sent
2875 Conf Rsp PENDING in the code above */
2876 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
2877 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
2878
2879 /* check compatibility */
2880
2881 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2882 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2883
2884 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 2885 l2cap_build_conf_rsp(chan, rsp,
0e8b207e
AE		 2886 L2CAP_CONF_SUCCESS, 0x0000), rsp);
2887 }
2888
1da177e4 2889unlock:
aa2ac881 2890 release_sock(sk);
1da177e4
LT		 2891 return 0;
2892}
2893
2894static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2895{
2896 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2897 u16 scid, flags, result;
48454079 2898 struct l2cap_chan *chan;
1da177e4 2899 struct sock *sk;
7b1c0049 2900 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 2901
2902 scid = __le16_to_cpu(rsp->scid);
2903 flags = __le16_to_cpu(rsp->flags);
2904 result = __le16_to_cpu(rsp->result);
2905
af05b30b
GP		 2906 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2907 scid, flags, result);
1da177e4 2908
baa7e1fa 2909 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2910 if (!chan)
1da177e4
LT		 2911 return 0;
2912
48454079
GP		 2913 sk = chan->sk;
2914
1da177e4
LT		 2915 switch (result) {
2916 case L2CAP_CONF_SUCCESS:
47d1ec61 2917 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 2918 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 2919 break;
2920
0e8b207e
AE		 2921 case L2CAP_CONF_PENDING:
2922 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
2923
2924 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
2925 char buf[64];
2926
2927 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2928 buf, &result);
2929 if (len < 0) {
2930 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2931 goto done;
2932 }
2933
2934 /* check compatibility */
2935
2936 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2937 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2938
2939 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 2940 l2cap_build_conf_rsp(chan, buf,
0e8b207e
AE		 2941 L2CAP_CONF_SUCCESS, 0x0000), buf);
2942 }
2943 goto done;
2944
1da177e4 2945 case L2CAP_CONF_UNACCEPT:
73ffa904 2946 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 2947 char req[64];
2948
c2c77ec8 2949 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 2950 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 2951 goto done;
2952 }
2953
f2fcfcd6
GP		 2954 /* throw out any old stored conf requests */
2955 result = L2CAP_CONF_SUCCESS;
b4450035
GP		 2956 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2957 req, &result);
f2fcfcd6 2958 if (len < 0) {
e92c8e70 2959 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 2960 goto done;
2961 }
2962
2963 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2964 L2CAP_CONF_REQ, len, req);
73ffa904 2965 chan->num_conf_req++;
f2fcfcd6
GP		 2966 if (result != L2CAP_CONF_SUCCESS)
2967 goto done;
2968 break;
1da177e4
LT		 2969 }
2970
8e87d142 2971 default:
b1235d79 2972 sk->sk_err = ECONNRESET;
f3f668b0 2973 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
e92c8e70 2974 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 2975 goto done;
2976 }
2977
2978 if (flags & 0x01)
2979 goto done;
2980
c1360a1c 2981 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 2982
c1360a1c 2983 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 2984 set_default_fcs(chan);
fcc203c3 2985
89bc500e 2986 l2cap_state_change(chan, BT_CONNECTED);
42e5c802
GP		 2987 chan->next_tx_seq = 0;
2988 chan->expected_tx_seq = 0;
58d35f87 2989 skb_queue_head_init(&chan->tx_q);
0c1bc5c6 2990 if (chan->mode == L2CAP_MODE_ERTM)
525cd185 2991 l2cap_ertm_init(chan);
0565c1c2 2992
1da177e4
LT		 2993 l2cap_chan_ready(sk);
2994 }
2995
2996done:
aa2ac881 2997 release_sock(sk);
1da177e4
LT		 2998 return 0;
2999}
3000
3001static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3002{
3003 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3004 struct l2cap_disconn_rsp rsp;
3005 u16 dcid, scid;
48454079 3006 struct l2cap_chan *chan;
1da177e4
LT		 3007 struct sock *sk;
3008
3009 scid = __le16_to_cpu(req->scid);
3010 dcid = __le16_to_cpu(req->dcid);
3011
3012 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3013
baa7e1fa 3014 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 3015 if (!chan)
1da177e4
LT		 3016 return 0;
3017
48454079
GP		 3018 sk = chan->sk;
3019
fe4128e0
GP		 3020 rsp.dcid = cpu_to_le16(chan->scid);
3021 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 3022 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3023
3024 sk->sk_shutdown = SHUTDOWN_MASK;
3025
48454079 3026 l2cap_chan_del(chan, ECONNRESET);
aa2ac881 3027 release_sock(sk);
1da177e4 3028
ba3bd0ee 3029 chan->ops->close(chan->data);
1da177e4
LT		 3030 return 0;
3031}
3032
3033static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3034{
3035 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3036 u16 dcid, scid;
48454079 3037 struct l2cap_chan *chan;
1da177e4
LT		 3038 struct sock *sk;
3039
3040 scid = __le16_to_cpu(rsp->scid);
3041 dcid = __le16_to_cpu(rsp->dcid);
3042
3043 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3044
baa7e1fa 3045 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 3046 if (!chan)
1da177e4
LT		 3047 return 0;
3048
48454079
GP		 3049 sk = chan->sk;
3050
48454079 3051 l2cap_chan_del(chan, 0);
aa2ac881 3052 release_sock(sk);
1da177e4 3053
ba3bd0ee 3054 chan->ops->close(chan->data);
1da177e4
LT		 3055 return 0;
3056}
3057
3058static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3059{
3060 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3061 u16 type;
3062
3063 type = __le16_to_cpu(req->type);
3064
3065 BT_DBG("type 0x%4.4x", type);
3066
f0709e03
MH		 3067 if (type == L2CAP_IT_FEAT_MASK) {
3068 u8 buf[8];
44dd46de 3069 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3070 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3071 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3072 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3073 if (!disable_ertm)
fcc203c3
GP		 3074 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3075 | L2CAP_FEAT_FCS;
a5fd6f30 3076 if (enable_hs)
6327eb98
AE		 3077 feat_mask |= L2CAP_FEAT_EXT_FLOW
3078 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 3079
1b7bf4ed 3080 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3081 l2cap_send_cmd(conn, cmd->ident,
3082 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3083 } else if (type == L2CAP_IT_FIXED_CHAN) {
3084 u8 buf[12];
3085 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 3086
3087 if (enable_hs)
3088 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
3089 else
3090 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
3091
e1027a7c
MH		 3092 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3093 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 3094 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
e1027a7c
MH		 3095 l2cap_send_cmd(conn, cmd->ident,
3096 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3097 } else {
3098 struct l2cap_info_rsp rsp;
3099 rsp.type = cpu_to_le16(type);
3100 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3101 l2cap_send_cmd(conn, cmd->ident,
3102 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3103 }
1da177e4
LT		 3104
3105 return 0;
3106}
3107
3108static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3109{
3110 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3111 u16 type, result;
3112
3113 type = __le16_to_cpu(rsp->type);
3114 result = __le16_to_cpu(rsp->result);
3115
3116 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3117
e90165be
AE		 3118 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
3119 if (cmd->ident != conn->info_ident ||
3120 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
3121 return 0;
3122
371fd835 3123 __cancel_delayed_work(&conn->info_timer);
4e8402a3 3124
adb08ede
VT		 3125 if (result != L2CAP_IR_SUCCESS) {
3126 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3127 conn->info_ident = 0;
3128
3129 l2cap_conn_start(conn);
3130
3131 return 0;
3132 }
3133
984947dc 3134 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3135 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3136
47ec1dcd 3137 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3138 struct l2cap_info_req req;
3139 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3140
3141 conn->info_ident = l2cap_get_ident(conn);
3142
3143 l2cap_send_cmd(conn, conn->info_ident,
3144 L2CAP_INFO_REQ, sizeof(req), &req);
3145 } else {
3146 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3147 conn->info_ident = 0;
3148
3149 l2cap_conn_start(conn);
3150 }
3151 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3152 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3153 conn->info_ident = 0;
984947dc
MH		 3154
3155 l2cap_conn_start(conn);
3156 }
4e8402a3 3157
1da177e4
LT		 3158 return 0;
3159}
3160
f94ff6ff
MM		 3161static inline int l2cap_create_channel_req(struct l2cap_conn *conn,
3162 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3163 void *data)
3164{
3165 struct l2cap_create_chan_req *req = data;
3166 struct l2cap_create_chan_rsp rsp;
3167 u16 psm, scid;
3168
3169 if (cmd_len != sizeof(*req))
3170 return -EPROTO;
3171
3172 if (!enable_hs)
3173 return -EINVAL;
3174
3175 psm = le16_to_cpu(req->psm);
3176 scid = le16_to_cpu(req->scid);
3177
3178 BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id);
3179
3180 /* Placeholder: Always reject */
3181 rsp.dcid = 0;
3182 rsp.scid = cpu_to_le16(scid);
3183 rsp.result = L2CAP_CR_NO_MEM;
3184 rsp.status = L2CAP_CS_NO_INFO;
3185
3186 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
3187 sizeof(rsp), &rsp);
3188
3189 return 0;
3190}
3191
3192static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn,
3193 struct l2cap_cmd_hdr *cmd, void *data)
3194{
3195 BT_DBG("conn %p", conn);
3196
3197 return l2cap_connect_rsp(conn, cmd, data);
3198}
3199
8d5a04a1
MM		 3200static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
3201 u16 icid, u16 result)
3202{
3203 struct l2cap_move_chan_rsp rsp;
3204
3205 BT_DBG("icid %d, result %d", icid, result);
3206
3207 rsp.icid = cpu_to_le16(icid);
3208 rsp.result = cpu_to_le16(result);
3209
3210 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
3211}
3212
3213static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn,
3214 struct l2cap_chan *chan, u16 icid, u16 result)
3215{
3216 struct l2cap_move_chan_cfm cfm;
3217 u8 ident;
3218
3219 BT_DBG("icid %d, result %d", icid, result);
3220
3221 ident = l2cap_get_ident(conn);
3222 if (chan)
3223 chan->ident = ident;
3224
3225 cfm.icid = cpu_to_le16(icid);
3226 cfm.result = cpu_to_le16(result);
3227
3228 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm);
3229}
3230
3231static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
3232 u16 icid)
3233{
3234 struct l2cap_move_chan_cfm_rsp rsp;
3235
3236 BT_DBG("icid %d", icid);
3237
3238 rsp.icid = cpu_to_le16(icid);
3239 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
3240}
3241
3242static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
3243 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3244{
3245 struct l2cap_move_chan_req *req = data;
3246 u16 icid = 0;
3247 u16 result = L2CAP_MR_NOT_ALLOWED;
3248
3249 if (cmd_len != sizeof(*req))
3250 return -EPROTO;
3251
3252 icid = le16_to_cpu(req->icid);
3253
3254 BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id);
3255
3256 if (!enable_hs)
3257 return -EINVAL;
3258
3259 /* Placeholder: Always refuse */
3260 l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
3261
3262 return 0;
3263}
3264
3265static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
3266 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3267{
3268 struct l2cap_move_chan_rsp *rsp = data;
3269 u16 icid, result;
3270
3271 if (cmd_len != sizeof(*rsp))
3272 return -EPROTO;
3273
3274 icid = le16_to_cpu(rsp->icid);
3275 result = le16_to_cpu(rsp->result);
3276
3277 BT_DBG("icid %d, result %d", icid, result);
3278
3279 /* Placeholder: Always unconfirmed */
3280 l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED);
3281
3282 return 0;
3283}
3284
3285static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
3286 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3287{
3288 struct l2cap_move_chan_cfm *cfm = data;
3289 u16 icid, result;
3290
3291 if (cmd_len != sizeof(*cfm))
3292 return -EPROTO;
3293
3294 icid = le16_to_cpu(cfm->icid);
3295 result = le16_to_cpu(cfm->result);
3296
3297 BT_DBG("icid %d, result %d", icid, result);
3298
3299 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
3300
3301 return 0;
3302}
3303
3304static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
3305 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3306{
3307 struct l2cap_move_chan_cfm_rsp *rsp = data;
3308 u16 icid;
3309
3310 if (cmd_len != sizeof(*rsp))
3311 return -EPROTO;
3312
3313 icid = le16_to_cpu(rsp->icid);
3314
3315 BT_DBG("icid %d", icid);
3316
3317 return 0;
3318}
3319
e2174ca4 3320static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
de73115a
CT		 3321 u16 to_multiplier)
3322{
3323 u16 max_latency;
3324
3325 if (min > max || min < 6 || max > 3200)
3326 return -EINVAL;
3327
3328 if (to_multiplier < 10 || to_multiplier > 3200)
3329 return -EINVAL;
3330
3331 if (max >= to_multiplier * 8)
3332 return -EINVAL;
3333
3334 max_latency = (to_multiplier * 8 / max) - 1;
3335 if (latency > 499 || latency > max_latency)
3336 return -EINVAL;
3337
3338 return 0;
3339}
3340
3341static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
3342 struct l2cap_cmd_hdr *cmd, u8 *data)
3343{
3344 struct hci_conn *hcon = conn->hcon;
3345 struct l2cap_conn_param_update_req *req;
3346 struct l2cap_conn_param_update_rsp rsp;
3347 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 3348 int err;
de73115a
CT		 3349
3350 if (!(hcon->link_mode & HCI_LM_MASTER))
3351 return -EINVAL;
3352
3353 cmd_len = __le16_to_cpu(cmd->len);
3354 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
3355 return -EPROTO;
3356
3357 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 3358 min = __le16_to_cpu(req->min);
3359 max = __le16_to_cpu(req->max);
de73115a
CT		 3360 latency = __le16_to_cpu(req->latency);
3361 to_multiplier = __le16_to_cpu(req->to_multiplier);
3362
3363 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
3364 min, max, latency, to_multiplier);
3365
3366 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 3367
3368 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
3369 if (err)
de73115a
CT		 3370 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
3371 else
3372 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
3373
3374 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
3375 sizeof(rsp), &rsp);
3376
2ce603eb
CT		 3377 if (!err)
3378 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
3379
de73115a
CT		 3380 return 0;
3381}
3382
3300d9a9
CT		 3383static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
3384 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3385{
3386 int err = 0;
3387
3388 switch (cmd->code) {
3389 case L2CAP_COMMAND_REJ:
3390 l2cap_command_rej(conn, cmd, data);
3391 break;
3392
3393 case L2CAP_CONN_REQ:
3394 err = l2cap_connect_req(conn, cmd, data);
3395 break;
3396
3397 case L2CAP_CONN_RSP:
3398 err = l2cap_connect_rsp(conn, cmd, data);
3399 break;
3400
3401 case L2CAP_CONF_REQ:
3402 err = l2cap_config_req(conn, cmd, cmd_len, data);
3403 break;
3404
3405 case L2CAP_CONF_RSP:
3406 err = l2cap_config_rsp(conn, cmd, data);
3407 break;
3408
3409 case L2CAP_DISCONN_REQ:
3410 err = l2cap_disconnect_req(conn, cmd, data);
3411 break;
3412
3413 case L2CAP_DISCONN_RSP:
3414 err = l2cap_disconnect_rsp(conn, cmd, data);
3415 break;
3416
3417 case L2CAP_ECHO_REQ:
3418 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
3419 break;
3420
3421 case L2CAP_ECHO_RSP:
3422 break;
3423
3424 case L2CAP_INFO_REQ:
3425 err = l2cap_information_req(conn, cmd, data);
3426 break;
3427
3428 case L2CAP_INFO_RSP:
3429 err = l2cap_information_rsp(conn, cmd, data);
3430 break;
3431
f94ff6ff
MM		 3432 case L2CAP_CREATE_CHAN_REQ:
3433 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
3434 break;
3435
3436 case L2CAP_CREATE_CHAN_RSP:
3437 err = l2cap_create_channel_rsp(conn, cmd, data);
3438 break;
3439
8d5a04a1
MM		 3440 case L2CAP_MOVE_CHAN_REQ:
3441 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
3442 break;
3443
3444 case L2CAP_MOVE_CHAN_RSP:
3445 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
3446 break;
3447
3448 case L2CAP_MOVE_CHAN_CFM:
3449 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
3450 break;
3451
3452 case L2CAP_MOVE_CHAN_CFM_RSP:
3453 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
3454 break;
3455
3300d9a9
CT		 3456 default:
3457 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
3458 err = -EINVAL;
3459 break;
3460 }
3461
3462 return err;
3463}
3464
3465static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
3466 struct l2cap_cmd_hdr *cmd, u8 *data)
3467{
3468 switch (cmd->code) {
3469 case L2CAP_COMMAND_REJ:
3470 return 0;
3471
3472 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 3473 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 3474
3475 case L2CAP_CONN_PARAM_UPDATE_RSP:
3476 return 0;
3477
3478 default:
3479 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
3480 return -EINVAL;
3481 }
3482}
3483
3484static inline void l2cap_sig_channel(struct l2cap_conn *conn,
3485 struct sk_buff *skb)
1da177e4
LT		 3486{
3487 u8 *data = skb->data;
3488 int len = skb->len;
3489 struct l2cap_cmd_hdr cmd;
3300d9a9 3490 int err;
1da177e4
LT		 3491
3492 l2cap_raw_recv(conn, skb);
3493
3494 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3495 u16 cmd_len;
1da177e4
LT		 3496 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3497 data += L2CAP_CMD_HDR_SIZE;
3498 len -= L2CAP_CMD_HDR_SIZE;
3499
88219a0f 3500 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3501
88219a0f 3502 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3503
88219a0f 3504 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3505 BT_DBG("corrupted command");
3506 break;
3507 }
3508
3300d9a9
CT		 3509 if (conn->hcon->type == LE_LINK)
3510 err = l2cap_le_sig_cmd(conn, &cmd, data);
3511 else
3512 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 3513
3514 if (err) {
e2fd318e 3515 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 3516
3517 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 3518
3519 /* FIXME: Map err to a valid reason */
e2fd318e 3520 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
1da177e4
LT		 3521 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3522 }
3523
88219a0f
AV		 3524 data += cmd_len;
3525 len -= cmd_len;
1da177e4
LT		 3526 }
3527
3528 kfree_skb(skb);
3529}
3530
47d1ec61 3531static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 3532{
3533 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 3534 int hdr_size;
3535
3536 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3537 hdr_size = L2CAP_EXT_HDR_SIZE;
3538 else
3539 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 3540
47d1ec61 3541 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 3542 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 3543 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3544 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3545
3546 if (our_fcs != rcv_fcs)
7a560e5c 3547 return -EBADMSG;
fcc203c3
GP		 3548 }
3549 return 0;
3550}
3551
525cd185 3552static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 3553{
88843ab0 3554 u32 control = 0;
d5392c8f 3555
6a026610 3556 chan->frames_sent = 0;
d5392c8f 3557
0b209fae 3558 control |= __set_reqseq(chan, chan->buffer_seq);
d5392c8f 3559
e2ab4353 3560 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 3561 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
525cd185 3562 l2cap_send_sframe(chan, control);
e2ab4353 3563 set_bit(CONN_RNR_SENT, &chan->conn_state);
d5392c8f
GP		 3564 }
3565
e2ab4353 3566 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
525cd185 3567 l2cap_retransmit_frames(chan);
d5392c8f 3568
525cd185 3569 l2cap_ertm_send(chan);
d5392c8f 3570
e2ab4353 3571 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
6a026610 3572 chan->frames_sent == 0) {
ab784b73 3573 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 3574 l2cap_send_sframe(chan, control);
d5392c8f
GP		 3575 }
3576}
3577
fb45de7d 3578static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar)
8f17154f
GP		 3579{
3580 struct sk_buff *next_skb;
bfbacc11 3581 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3582
3583 bt_cb(skb)->tx_seq = tx_seq;
3584 bt_cb(skb)->sar = sar;
3585
f1c6775b 3586 next_skb = skb_peek(&chan->srej_q);
8f17154f 3587
836be934 3588 tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
bfbacc11 3589
039d9572 3590 while (next_skb) {
9b53350d
JPRV		 3591 if (bt_cb(next_skb)->tx_seq == tx_seq)
3592 return -EINVAL;
3593
836be934
AE		 3594 next_tx_seq_offset = __seq_offset(chan,
3595 bt_cb(next_skb)->tx_seq, chan->buffer_seq);
bfbacc11
JPRV		 3596
3597 if (next_tx_seq_offset > tx_seq_offset) {
f1c6775b 3598 __skb_queue_before(&chan->srej_q, next_skb, skb);
9b53350d 3599 return 0;
8f17154f
GP		 3600 }
3601
f1c6775b 3602 if (skb_queue_is_last(&chan->srej_q, next_skb))
039d9572
SJ		 3603 next_skb = NULL;
3604 else
3605 next_skb = skb_queue_next(&chan->srej_q, next_skb);
3606 }
8f17154f 3607
f1c6775b 3608 __skb_queue_tail(&chan->srej_q, skb);
9b53350d
JPRV		 3609
3610 return 0;
8f17154f
GP		 3611}
3612
84084a31
MM		 3613static void append_skb_frag(struct sk_buff *skb,
3614 struct sk_buff *new_frag, struct sk_buff **last_frag)
18778a63 3615{
84084a31
MM		 3616 /* skb->len reflects data in skb as well as all fragments
3617 * skb->data_len reflects only data in fragments
3618 */
3619 if (!skb_has_frag_list(skb))
3620 skb_shinfo(skb)->frag_list = new_frag;
3621
3622 new_frag->next = NULL;
3623
3624 (*last_frag)->next = new_frag;
3625 *last_frag = new_frag;
3626
3627 skb->len += new_frag->len;
3628 skb->data_len += new_frag->len;
3629 skb->truesize += new_frag->truesize;
3630}
3631
88843ab0 3632static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control)
84084a31
MM		 3633{
3634 int err = -EINVAL;
18778a63 3635
7e0ef6ee
AE		 3636 switch (__get_ctrl_sar(chan, control)) {
3637 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 3638 if (chan->sdu)
3639 break;
18778a63 3640
84084a31
MM		 3641 err = chan->ops->recv(chan->data, skb);
3642 break;
18778a63 3643
7e0ef6ee 3644 case L2CAP_SAR_START:
84084a31
MM		 3645 if (chan->sdu)
3646 break;
18778a63 3647
6f61fd47 3648 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 3649 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 3650
84084a31
MM		 3651 if (chan->sdu_len > chan->imtu) {
3652 err = -EMSGSIZE;
3653 break;
3654 }
1890d36b 3655
84084a31
MM		 3656 if (skb->len >= chan->sdu_len)
3657 break;
18778a63 3658
84084a31
MM		 3659 chan->sdu = skb;
3660 chan->sdu_last_frag = skb;
18778a63 3661
84084a31
MM		 3662 skb = NULL;
3663 err = 0;
18778a63
GP		 3664 break;
3665
7e0ef6ee 3666 case L2CAP_SAR_CONTINUE:
6f61fd47 3667 if (!chan->sdu)
84084a31 3668 break;
18778a63 3669
84084a31
MM		 3670 append_skb_frag(chan->sdu, skb,
3671 &chan->sdu_last_frag);
3672 skb = NULL;
18778a63 3673
84084a31
MM		 3674 if (chan->sdu->len >= chan->sdu_len)
3675 break;
4178ba46 3676
84084a31 3677 err = 0;
18778a63
GP		 3678 break;
3679
7e0ef6ee 3680 case L2CAP_SAR_END:
6f61fd47 3681 if (!chan->sdu)
84084a31 3682 break;
18778a63 3683
84084a31
MM		 3684 append_skb_frag(chan->sdu, skb,
3685 &chan->sdu_last_frag);
3686 skb = NULL;
4178ba46 3687
84084a31
MM		 3688 if (chan->sdu->len != chan->sdu_len)
3689 break;
18778a63 3690
84084a31 3691 err = chan->ops->recv(chan->data, chan->sdu);
1890d36b 3692
84084a31
MM		 3693 if (!err) {
3694 /* Reassembly complete */
3695 chan->sdu = NULL;
3696 chan->sdu_last_frag = NULL;
3697 chan->sdu_len = 0;
1890d36b 3698 }
18778a63
GP		 3699 break;
3700 }
3701
84084a31
MM		 3702 if (err) {
3703 kfree_skb(skb);
3704 kfree_skb(chan->sdu);
3705 chan->sdu = NULL;
3706 chan->sdu_last_frag = NULL;
3707 chan->sdu_len = 0;
3708 }
18778a63 3709
84084a31 3710 return err;
18778a63
GP		 3711}
3712
26f880d2 3713static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan)
712132eb 3714{
88843ab0 3715 u32 control;
712132eb 3716
26f880d2 3717 BT_DBG("chan %p, Enter local busy", chan);
712132eb 3718
26f880d2
MM		 3719 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3720
0b209fae 3721 control = __set_reqseq(chan, chan->buffer_seq);
ab784b73 3722 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
26f880d2
MM		 3723 l2cap_send_sframe(chan, control);
3724
3725 set_bit(CONN_RNR_SENT, &chan->conn_state);
3726
3727 __clear_ack_timer(chan);
3728}
3729
3730static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan)
3731{
88843ab0 3732 u32 control;
712132eb 3733
e2ab4353 3734 if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
712132eb
GP		 3735 goto done;
3736
0b209fae 3737 control = __set_reqseq(chan, chan->buffer_seq);
e3781735 3738 control |= __set_ctrl_poll(chan);
ab784b73 3739 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 3740 l2cap_send_sframe(chan, control);
6a026610 3741 chan->retry_count = 1;
712132eb 3742
1a09bcb9
GP		 3743 __clear_retrans_timer(chan);
3744 __set_monitor_timer(chan);
712132eb 3745
e2ab4353 3746 set_bit(CONN_WAIT_F, &chan->conn_state);
712132eb
GP		 3747
3748done:
e2ab4353
GP		 3749 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3750 clear_bit(CONN_RNR_SENT, &chan->conn_state);
712132eb 3751
49208c9c 3752 BT_DBG("chan %p, Exit local busy", chan);
712132eb
GP		 3753}
3754
e328140f 3755void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
1890d36b 3756{
e328140f
MM		 3757 if (chan->mode == L2CAP_MODE_ERTM) {
3758 if (busy)
3759 l2cap_ertm_enter_local_busy(chan);
3760 else
3761 l2cap_ertm_exit_local_busy(chan);
1890d36b 3762 }
1890d36b
GP		 3763}
3764
fb45de7d 3765static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq)
8f17154f
GP		 3766{
3767 struct sk_buff *skb;
88843ab0 3768 u32 control;
8f17154f 3769
e328140f
MM		 3770 while ((skb = skb_peek(&chan->srej_q)) &&
3771 !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
3772 int err;
3773
8f17154f
GP		 3774 if (bt_cb(skb)->tx_seq != tx_seq)
3775 break;
3776
f1c6775b 3777 skb = skb_dequeue(&chan->srej_q);
7e0ef6ee 3778 control = __set_ctrl_sar(chan, bt_cb(skb)->sar);
84084a31 3779 err = l2cap_reassemble_sdu(chan, skb, control);
e328140f
MM		 3780
3781 if (err < 0) {
3782 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3783 break;
3784 }
3785
836be934
AE		 3786 chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej);
3787 tx_seq = __next_seq(chan, tx_seq);
8f17154f
GP		 3788 }
3789}
3790
fb45de7d 3791static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 3792{
8f17154f 3793 struct srej_list *l, *tmp;
88843ab0 3794 u32 control;
8f17154f 3795
39d5a3ee 3796 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
8f17154f
GP		 3797 if (l->tx_seq == tx_seq) {
3798 list_del(&l->list);
3799 kfree(l);
3800 return;
3801 }
ab784b73 3802 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
0b209fae 3803 control |= __set_reqseq(chan, l->tx_seq);
525cd185 3804 l2cap_send_sframe(chan, control);
8f17154f 3805 list_del(&l->list);
39d5a3ee 3806 list_add_tail(&l->list, &chan->srej_l);
8f17154f
GP		 3807 }
3808}
3809
aef89f21 3810static int l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 3811{
8f17154f 3812 struct srej_list *new;
88843ab0 3813 u32 control;
8f17154f 3814
42e5c802 3815 while (tx_seq != chan->expected_tx_seq) {
ab784b73 3816 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
0b209fae 3817 control |= __set_reqseq(chan, chan->expected_tx_seq);
525cd185 3818 l2cap_send_sframe(chan, control);
8f17154f
GP		 3819
3820 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
aef89f21
SJ		 3821 if (!new)
3822 return -ENOMEM;
3823
42e5c802 3824 new->tx_seq = chan->expected_tx_seq;
836be934
AE		 3825
3826 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
3827
39d5a3ee 3828 list_add_tail(&new->list, &chan->srej_l);
8f17154f 3829 }
836be934
AE		 3830
3831 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
aef89f21
SJ		 3832
3833 return 0;
8f17154f
GP		 3834}
3835
88843ab0 3836static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
1c2acffb 3837{
fb45de7d 3838 u16 tx_seq = __get_txseq(chan, rx_control);
0b209fae 3839 u16 req_seq = __get_reqseq(chan, rx_control);
7e0ef6ee 3840 u8 sar = __get_ctrl_sar(chan, rx_control);
f6337c77 3841 int tx_seq_offset, expected_tx_seq_offset;
47d1ec61 3842 int num_to_ack = (chan->tx_win/6) + 1;
1c2acffb
GP		 3843 int err = 0;
3844
88843ab0 3845 BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len,
525cd185 3846 tx_seq, rx_control);
1c2acffb 3847
03f6715d 3848 if (__is_ctrl_final(chan, rx_control) &&
e2ab4353 3849 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1a09bcb9 3850 __clear_monitor_timer(chan);
6a026610 3851 if (chan->unacked_frames > 0)
1a09bcb9 3852 __set_retrans_timer(chan);
e2ab4353 3853 clear_bit(CONN_WAIT_F, &chan->conn_state);
1d8f5d16
GP		 3854 }
3855
42e5c802
GP		 3856 chan->expected_ack_seq = req_seq;
3857 l2cap_drop_acked_frames(chan);
9f121a5a 3858
836be934 3859 tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
9b53350d
JPRV		 3860
3861 /* invalid tx_seq */
47d1ec61 3862 if (tx_seq_offset >= chan->tx_win) {
8c1d787b 3863 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
9b53350d
JPRV		 3864 goto drop;
3865 }
3866
e2ab4353 3867 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1890d36b
GP		 3868 goto drop;
3869
02f1b641
MM		 3870 if (tx_seq == chan->expected_tx_seq)
3871 goto expected;
3872
e2ab4353 3873 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
8f17154f 3874 struct srej_list *first;
30afb5b2 3875
39d5a3ee 3876 first = list_first_entry(&chan->srej_l,
8f17154f
GP		 3877 struct srej_list, list);
3878 if (tx_seq == first->tx_seq) {
42e5c802 3879 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
525cd185 3880 l2cap_check_srej_gap(chan, tx_seq);
8f17154f
GP		 3881
3882 list_del(&first->list);
3883 kfree(first);
3884
39d5a3ee 3885 if (list_empty(&chan->srej_l)) {
42e5c802 3886 chan->buffer_seq = chan->buffer_seq_srej;
e2ab4353 3887 clear_bit(CONN_SREJ_SENT, &chan->conn_state);
525cd185 3888 l2cap_send_ack(chan);
49208c9c 3889 BT_DBG("chan %p, Exit SREJ_SENT", chan);
8f17154f
GP		 3890 }
3891 } else {
3892 struct srej_list *l;
9b53350d
JPRV		 3893
3894 /* duplicated tx_seq */
42e5c802 3895 if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
9b53350d 3896 goto drop;
8f17154f 3897
39d5a3ee 3898 list_for_each_entry(l, &chan->srej_l, list) {
8f17154f 3899 if (l->tx_seq == tx_seq) {
525cd185 3900 l2cap_resend_srejframe(chan, tx_seq);
8f17154f
GP		 3901 return 0;
3902 }
3903 }
aef89f21
SJ		 3904
3905 err = l2cap_send_srejframe(chan, tx_seq);
3906 if (err < 0) {
3907 l2cap_send_disconn_req(chan->conn, chan, -err);
3908 return err;
3909 }
30afb5b2
GP		 3910 }
3911 } else {
836be934
AE		 3912 expected_tx_seq_offset = __seq_offset(chan,
3913 chan->expected_tx_seq, chan->buffer_seq);
9b53350d
JPRV		 3914
3915 /* duplicated tx_seq */
3916 if (tx_seq_offset < expected_tx_seq_offset)
3917 goto drop;
3918
e2ab4353 3919 set_bit(CONN_SREJ_SENT, &chan->conn_state);
1c2acffb 3920
49208c9c 3921 BT_DBG("chan %p, Enter SREJ", chan);
0e98958d 3922
39d5a3ee 3923 INIT_LIST_HEAD(&chan->srej_l);
42e5c802 3924 chan->buffer_seq_srej = chan->buffer_seq;
8f17154f 3925
f1c6775b 3926 __skb_queue_head_init(&chan->srej_q);
42e5c802 3927 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
8f17154f 3928
e2ab4353 3929 set_bit(CONN_SEND_PBIT, &chan->conn_state);
ef54fd93 3930
aef89f21
SJ		 3931 err = l2cap_send_srejframe(chan, tx_seq);
3932 if (err < 0) {
3933 l2cap_send_disconn_req(chan->conn, chan, -err);
3934 return err;
3935 }
7fe9b298 3936
1a09bcb9 3937 __clear_ack_timer(chan);
1c2acffb 3938 }
30afb5b2
GP		 3939 return 0;
3940
8f17154f 3941expected:
836be934 3942 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
8f17154f 3943
e2ab4353 3944 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3b1a9f3f
GP		 3945 bt_cb(skb)->tx_seq = tx_seq;
3946 bt_cb(skb)->sar = sar;
f1c6775b 3947 __skb_queue_tail(&chan->srej_q, skb);
8f17154f
GP		 3948 return 0;
3949 }
3950
84084a31 3951 err = l2cap_reassemble_sdu(chan, skb, rx_control);
836be934
AE		 3952 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
3953
e328140f
MM		 3954 if (err < 0) {
3955 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3956 return err;
3957 }
2ece3684 3958
03f6715d 3959 if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 3960 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 3961 l2cap_retransmit_frames(chan);
4ec10d97
GP		 3962 }
3963
c1b4f43b 3964
6a026610
GP		 3965 chan->num_acked = (chan->num_acked + 1) % num_to_ack;
3966 if (chan->num_acked == num_to_ack - 1)
525cd185 3967 l2cap_send_ack(chan);
4d611e4d
GP		 3968 else
3969 __set_ack_timer(chan);
9e917af1 3970
8f17154f 3971 return 0;
9b53350d
JPRV		 3972
3973drop:
3974 kfree_skb(skb);
3975 return 0;
1c2acffb
GP		 3976}
3977
88843ab0 3978static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control)
1c2acffb 3979{
88843ab0 3980 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan,
0b209fae 3981 __get_reqseq(chan, rx_control), rx_control);
0e98958d 3982
0b209fae 3983 chan->expected_ack_seq = __get_reqseq(chan, rx_control);
42e5c802 3984 l2cap_drop_acked_frames(chan);
1c2acffb 3985
e3781735 3986 if (__is_ctrl_poll(chan, rx_control)) {
e2ab4353
GP		 3987 set_bit(CONN_SEND_FBIT, &chan->conn_state);
3988 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3989 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
6a026610 3990 (chan->unacked_frames > 0))
1a09bcb9 3991 __set_retrans_timer(chan);
05fbd89d 3992
e2ab4353 3993 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
525cd185 3994 l2cap_send_srejtail(chan);
05fbd89d 3995 } else {
525cd185 3996 l2cap_send_i_or_rr_or_rnr(chan);
05fbd89d 3997 }
1d8f5d16 3998
03f6715d 3999 } else if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4000 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4ec10d97 4001
e2ab4353 4002 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 4003 l2cap_retransmit_frames(chan);
2246b2f1 4004
e072745f 4005 } else {
e2ab4353 4006 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
6a026610 4007 (chan->unacked_frames > 0))
1a09bcb9 4008 __set_retrans_timer(chan);
1c2acffb 4009
e2ab4353
GP		 4010 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4011 if (test_bit(CONN_SREJ_SENT, &chan->conn_state))
525cd185 4012 l2cap_send_ack(chan);
894718a6 4013 else
525cd185 4014 l2cap_ertm_send(chan);
e072745f
GP		 4015 }
4016}
2246b2f1 4017
88843ab0 4018static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4019{
0b209fae 4020 u16 tx_seq = __get_reqseq(chan, rx_control);
30afb5b2 4021
88843ab0 4022 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4023
e2ab4353 4024 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
e072745f 4025
42e5c802
GP		 4026 chan->expected_ack_seq = tx_seq;
4027 l2cap_drop_acked_frames(chan);
e072745f 4028
03f6715d 4029 if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4030 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 4031 l2cap_retransmit_frames(chan);
e072745f 4032 } else {
525cd185 4033 l2cap_retransmit_frames(chan);
30afb5b2 4034
e2ab4353
GP		 4035 if (test_bit(CONN_WAIT_F, &chan->conn_state))
4036 set_bit(CONN_REJ_ACT, &chan->conn_state);
e072745f
GP		 4037 }
4038}
88843ab0 4039static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4040{
0b209fae 4041 u16 tx_seq = __get_reqseq(chan, rx_control);
30afb5b2 4042
88843ab0 4043 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4044
e2ab4353 4045 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
2246b2f1 4046
e3781735 4047 if (__is_ctrl_poll(chan, rx_control)) {
42e5c802
GP		 4048 chan->expected_ack_seq = tx_seq;
4049 l2cap_drop_acked_frames(chan);
3cb123d1 4050
e2ab4353 4051 set_bit(CONN_SEND_FBIT, &chan->conn_state);
525cd185 4052 l2cap_retransmit_one_frame(chan, tx_seq);
dfc909be 4053
525cd185 4054 l2cap_ertm_send(chan);
dfc909be 4055
e2ab4353 4056 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
6a026610 4057 chan->srej_save_reqseq = tx_seq;
e2ab4353 4058 set_bit(CONN_SREJ_ACT, &chan->conn_state);
ef54fd93 4059 }
03f6715d 4060 } else if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4061 if (test_bit(CONN_SREJ_ACT, &chan->conn_state) &&
6a026610 4062 chan->srej_save_reqseq == tx_seq)
e2ab4353 4063 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
e072745f 4064 else
525cd185 4065 l2cap_retransmit_one_frame(chan, tx_seq);
e072745f 4066 } else {
525cd185 4067 l2cap_retransmit_one_frame(chan, tx_seq);
e2ab4353 4068 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
6a026610 4069 chan->srej_save_reqseq = tx_seq;
e2ab4353 4070 set_bit(CONN_SREJ_ACT, &chan->conn_state);
ef54fd93 4071 }
e072745f
GP		 4072 }
4073}
4074
88843ab0 4075static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4076{
0b209fae 4077 u16 tx_seq = __get_reqseq(chan, rx_control);
e072745f 4078
88843ab0 4079 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4080
e2ab4353 4081 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
42e5c802
GP		 4082 chan->expected_ack_seq = tx_seq;
4083 l2cap_drop_acked_frames(chan);
e072745f 4084
e3781735 4085 if (__is_ctrl_poll(chan, rx_control))
e2ab4353 4086 set_bit(CONN_SEND_FBIT, &chan->conn_state);
3cb123d1 4087
e2ab4353 4088 if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
1a09bcb9 4089 __clear_retrans_timer(chan);
e3781735 4090 if (__is_ctrl_poll(chan, rx_control))
525cd185 4091 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
99b0d4b7 4092 return;
e072745f 4093 }
99b0d4b7 4094
e3781735 4095 if (__is_ctrl_poll(chan, rx_control)) {
525cd185 4096 l2cap_send_srejtail(chan);
ab784b73
AE		 4097 } else {
4098 rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR);
4099 l2cap_send_sframe(chan, rx_control);
4100 }
e072745f
GP		 4101}
4102
88843ab0 4103static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
e072745f 4104{
88843ab0 4105 BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len);
e072745f 4106
03f6715d 4107 if (__is_ctrl_final(chan, rx_control) &&
e2ab4353 4108 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1a09bcb9 4109 __clear_monitor_timer(chan);
6a026610 4110 if (chan->unacked_frames > 0)
1a09bcb9 4111 __set_retrans_timer(chan);
e2ab4353 4112 clear_bit(CONN_WAIT_F, &chan->conn_state);
e072745f
GP		 4113 }
4114
ab784b73
AE		 4115 switch (__get_ctrl_super(chan, rx_control)) {
4116 case L2CAP_SUPER_RR:
525cd185 4117 l2cap_data_channel_rrframe(chan, rx_control);
8f17154f
GP		 4118 break;
4119
ab784b73 4120 case L2CAP_SUPER_REJ:
525cd185 4121 l2cap_data_channel_rejframe(chan, rx_control);
e072745f 4122 break;
2246b2f1 4123
ab784b73 4124 case L2CAP_SUPER_SREJ:
525cd185 4125 l2cap_data_channel_srejframe(chan, rx_control);
e072745f
GP		 4126 break;
4127
ab784b73 4128 case L2CAP_SUPER_RNR:
525cd185 4129 l2cap_data_channel_rnrframe(chan, rx_control);
1c2acffb
GP		 4130 break;
4131 }
4132
faaebd19 4133 kfree_skb(skb);
1c2acffb
GP		 4134 return 0;
4135}
4136
218bb9df
GP		 4137static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
4138{
525cd185 4139 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
88843ab0 4140 u32 control;
0b209fae 4141 u16 req_seq;
218bb9df
GP		 4142 int len, next_tx_seq_offset, req_seq_offset;
4143
88843ab0
AE		 4144 control = __get_control(chan, skb->data);
4145 skb_pull(skb, __ctrl_size(chan));
218bb9df
GP		 4146 len = skb->len;
4147
4148 /*
4149 * We can just drop the corrupted I-frame here.
4150 * Receiver will miss it and start proper recovery
4151 * procedures and ask retransmission.
4152 */
47d1ec61 4153 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 4154 goto drop;
4155
793c2f1c 4156 if (__is_sar_start(chan, control) && !__is_sframe(chan, control))
03a51213 4157 len -= L2CAP_SDULEN_SIZE;
218bb9df 4158
47d1ec61 4159 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 4160 len -= L2CAP_FCS_SIZE;
218bb9df 4161
47d1ec61 4162 if (len > chan->mps) {
8c1d787b 4163 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4164 goto drop;
4165 }
4166
0b209fae 4167 req_seq = __get_reqseq(chan, control);
218bb9df 4168
836be934
AE		 4169 req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq);
4170
4171 next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq,
4172 chan->expected_ack_seq);
218bb9df
GP		 4173
4174 /* check for invalid req-seq */
4175 if (req_seq_offset > next_tx_seq_offset) {
8c1d787b 4176 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4177 goto drop;
4178 }
4179
793c2f1c 4180 if (!__is_sframe(chan, control)) {
218bb9df 4181 if (len < 0) {
8c1d787b 4182 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4183 goto drop;
4184 }
4185
525cd185 4186 l2cap_data_channel_iframe(chan, control, skb);
218bb9df
GP		 4187 } else {
4188 if (len != 0) {
4189 BT_ERR("%d", len);
8c1d787b 4190 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4191 goto drop;
4192 }
4193
525cd185 4194 l2cap_data_channel_sframe(chan, control, skb);
218bb9df
GP		 4195 }
4196
4197 return 0;
4198
4199drop:
4200 kfree_skb(skb);
4201 return 0;
4202}
4203
1da177e4
LT		 4204static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4205{
48454079 4206 struct l2cap_chan *chan;
bf734843 4207 struct sock *sk = NULL;
88843ab0 4208 u32 control;
fb45de7d 4209 u16 tx_seq;
218bb9df 4210 int len;
1da177e4 4211
baa7e1fa 4212 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 4213 if (!chan) {
1da177e4
LT		 4214 BT_DBG("unknown cid 0x%4.4x", cid);
4215 goto drop;
4216 }
4217
48454079 4218 sk = chan->sk;
6840ed07 4219
49208c9c 4220 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 4221
89bc500e 4222 if (chan->state != BT_CONNECTED)
1da177e4
LT		 4223 goto drop;
4224
0c1bc5c6 4225 switch (chan->mode) {
1c2acffb
GP		 4226 case L2CAP_MODE_BASIC:
4227 /* If socket recv buffers overflows we drop data here
4228 * which is *bad* because L2CAP has to be reliable.
4229 * But we don't have any other choice. L2CAP doesn't
4230 * provide flow control mechanism. */
1da177e4 4231
0c1bc5c6 4232 if (chan->imtu < skb->len)
1c2acffb 4233 goto drop;
1da177e4 4234
23070494 4235 if (!chan->ops->recv(chan->data, skb))
1c2acffb
GP		 4236 goto done;
4237 break;
4238
4239 case L2CAP_MODE_ERTM:
eb403a1b 4240 l2cap_ertm_data_rcv(sk, skb);
1c2acffb 4241
fcafde2e 4242 goto done;
1c2acffb 4243
6840ed07 4244 case L2CAP_MODE_STREAMING:
88843ab0
AE		 4245 control = __get_control(chan, skb->data);
4246 skb_pull(skb, __ctrl_size(chan));
6840ed07
GP		 4247 len = skb->len;
4248
47d1ec61 4249 if (l2cap_check_fcs(chan, skb))
26000089
GP		 4250 goto drop;
4251
7e0ef6ee 4252 if (__is_sar_start(chan, control))
03a51213 4253 len -= L2CAP_SDULEN_SIZE;
6840ed07 4254
47d1ec61 4255 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 4256 len -= L2CAP_FCS_SIZE;
fcc203c3 4257
793c2f1c 4258 if (len > chan->mps || len < 0 || __is_sframe(chan, control))
6840ed07
GP		 4259 goto drop;
4260
fb45de7d 4261 tx_seq = __get_txseq(chan, control);
6840ed07 4262
84084a31
MM		 4263 if (chan->expected_tx_seq != tx_seq) {
4264 /* Frame(s) missing - must discard partial SDU */
4265 kfree_skb(chan->sdu);
4266 chan->sdu = NULL;
4267 chan->sdu_last_frag = NULL;
4268 chan->sdu_len = 0;
6840ed07 4269
84084a31
MM		 4270 /* TODO: Notify userland of missing data */
4271 }
4272
836be934 4273 chan->expected_tx_seq = __next_seq(chan, tx_seq);
84084a31
MM		 4274
4275 if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE)
4276 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
6840ed07
GP		 4277
4278 goto done;
4279
1c2acffb 4280 default:
0c1bc5c6 4281 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 4282 break;
4283 }
1da177e4
LT		 4284
4285drop:
4286 kfree_skb(skb);
4287
4288done:
0139418c 4289 if (sk)
aa2ac881 4290 release_sock(sk);
0139418c 4291
1da177e4
LT		 4292 return 0;
4293}
4294
8e036fc3 4295static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4 4296{
6dcae1ea 4297 struct sock *sk = NULL;
23691d75 4298 struct l2cap_chan *chan;
1da177e4 4299
23691d75
GP		 4300 chan = l2cap_global_chan_by_psm(0, psm, conn->src);
4301 if (!chan)
1da177e4
LT		 4302 goto drop;
4303
23691d75
GP		 4304 sk = chan->sk;
4305
aa2ac881 4306 lock_sock(sk);
e0f0cb56 4307
1da177e4
LT		 4308 BT_DBG("sk %p, len %d", sk, skb->len);
4309
89bc500e 4310 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 4311 goto drop;
4312
e13e21dc 4313 if (chan->imtu < skb->len)
1da177e4
LT		 4314 goto drop;
4315
23070494 4316 if (!chan->ops->recv(chan->data, skb))
1da177e4
LT		 4317 goto done;
4318
4319drop:
4320 kfree_skb(skb);
4321
4322done:
af05b30b 4323 if (sk)
aa2ac881 4324 release_sock(sk);
1da177e4
LT		 4325 return 0;
4326}
4327
9f69bda6
GP		 4328static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb)
4329{
6dcae1ea 4330 struct sock *sk = NULL;
23691d75 4331 struct l2cap_chan *chan;
9f69bda6 4332
23691d75
GP		 4333 chan = l2cap_global_chan_by_scid(0, cid, conn->src);
4334 if (!chan)
9f69bda6
GP		 4335 goto drop;
4336
23691d75
GP		 4337 sk = chan->sk;
4338
aa2ac881 4339 lock_sock(sk);
9f69bda6
GP		 4340
4341 BT_DBG("sk %p, len %d", sk, skb->len);
4342
89bc500e 4343 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 4344 goto drop;
4345
e13e21dc 4346 if (chan->imtu < skb->len)
9f69bda6
GP		 4347 goto drop;
4348
23070494 4349 if (!chan->ops->recv(chan->data, skb))
9f69bda6
GP		 4350 goto done;
4351
4352drop:
4353 kfree_skb(skb);
4354
4355done:
4356 if (sk)
aa2ac881 4357 release_sock(sk);
9f69bda6
GP		 4358 return 0;
4359}
4360
1da177e4
LT		 4361static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4362{
4363 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4364 u16 cid, len;
4365 __le16 psm;
1da177e4
LT		 4366
4367 skb_pull(skb, L2CAP_HDR_SIZE);
4368 cid = __le16_to_cpu(lh->cid);
4369 len = __le16_to_cpu(lh->len);
4370
1c2acffb
GP		 4371 if (len != skb->len) {
4372 kfree_skb(skb);
4373 return;
4374 }
4375
1da177e4
LT		 4376 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4377
4378 switch (cid) {
3300d9a9 4379 case L2CAP_CID_LE_SIGNALING:
8db4dc46 4380 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4381 l2cap_sig_channel(conn, skb);
4382 break;
4383
8db4dc46 4384 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4385 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4386 skb_pull(skb, 2);
4387 l2cap_conless_channel(conn, psm, skb);
4388 break;
4389
9f69bda6
GP		 4390 case L2CAP_CID_LE_DATA:
4391 l2cap_att_channel(conn, cid, skb);
4392 break;
4393
b501d6a1
AB		 4394 case L2CAP_CID_SMP:
4395 if (smp_sig_channel(conn, skb))
4396 l2cap_conn_del(conn->hcon, EACCES);
4397 break;
4398
1da177e4
LT		 4399 default:
4400 l2cap_data_channel(conn, cid, skb);
4401 break;
4402 }
4403}
4404
4405/* ---- L2CAP interface with lower layer (HCI) ---- */
4406
686ebf28 4407int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
1da177e4
LT		 4408{
4409 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 4410 struct l2cap_chan *c;
1da177e4 4411
1da177e4
LT		 4412 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4413
4414 /* Find listening sockets and check their link_mode */
23691d75
GP		 4415 read_lock(&chan_list_lock);
4416 list_for_each_entry(c, &chan_list, global_l) {
4417 struct sock *sk = c->sk;
4343478f 4418
89bc500e 4419 if (c->state != BT_LISTEN)
1da177e4
LT		 4420 continue;
4421
4422 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 4423 lm1 |= HCI_LM_ACCEPT;
43bd0f32 4424 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 4425 lm1 |= HCI_LM_MASTER;
1da177e4 4426 exact++;
2af6b9d5
MH		 4427 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4428 lm2 |= HCI_LM_ACCEPT;
43bd0f32 4429 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 4430 lm2 |= HCI_LM_MASTER;
4431 }
1da177e4 4432 }
23691d75 4433 read_unlock(&chan_list_lock);
1da177e4
LT		 4434
4435 return exact ? lm1 : lm2;
4436}
4437
686ebf28 4438int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
1da177e4 4439{
0139418c
MH		 4440 struct l2cap_conn *conn;
4441
1da177e4
LT		 4442 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4443
1da177e4 4444 if (!status) {
1da177e4
LT		 4445 conn = l2cap_conn_add(hcon, status);
4446 if (conn)
4447 l2cap_conn_ready(conn);
0139418c 4448 } else
e175072f 4449 l2cap_conn_del(hcon, bt_to_errno(status));
1da177e4
LT		 4450
4451 return 0;
4452}
4453
686ebf28 4454int l2cap_disconn_ind(struct hci_conn *hcon)
2950f21a
MH		 4455{
4456 struct l2cap_conn *conn = hcon->l2cap_data;
4457
4458 BT_DBG("hcon %p", hcon);
4459
686ebf28 4460 if (!conn)
9f5a0d7b 4461 return HCI_ERROR_REMOTE_USER_TERM;
2950f21a
MH		 4462 return conn->disc_reason;
4463}
4464
686ebf28 4465int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4466{
4467 BT_DBG("hcon %p reason %d", hcon, reason);
4468
e175072f 4469 l2cap_conn_del(hcon, bt_to_errno(reason));
1da177e4
LT		 4470 return 0;
4471}
4472
4343478f 4473static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 4474{
715ec005 4475 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 4476 return;
4477
f62e4323 4478 if (encrypt == 0x00) {
4343478f 4479 if (chan->sec_level == BT_SECURITY_MEDIUM) {
c9b66675 4480 __clear_chan_timer(chan);
f3f668b0 4481 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
4343478f 4482 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 4483 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 4484 } else {
4343478f 4485 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 4486 __clear_chan_timer(chan);
f62e4323
MH		 4487 }
4488}
4489
686ebf28 4490int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 4491{
0139418c 4492 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 4493 struct l2cap_chan *chan;
1da177e4 4494
0139418c 4495 if (!conn)
1da177e4 4496 return 0;
0139418c 4497
1da177e4
LT		 4498 BT_DBG("conn %p", conn);
4499
160dc6ac
VCG		 4500 if (hcon->type == LE_LINK) {
4501 smp_distribute_keys(conn, 0);
371fd835 4502 __cancel_delayed_work(&conn->security_timer);
160dc6ac
VCG		 4503 }
4504
3d57dc68 4505 rcu_read_lock();
1da177e4 4506
3d57dc68 4507 list_for_each_entry_rcu(chan, &conn->chan_l, list) {
48454079 4508 struct sock *sk = chan->sk;
baa7e1fa 4509
1da177e4
LT		 4510 bh_lock_sock(sk);
4511
f1cb9af5
VCG		 4512 BT_DBG("chan->scid %d", chan->scid);
4513
4514 if (chan->scid == L2CAP_CID_LE_DATA) {
4515 if (!status && encrypt) {
4516 chan->sec_level = hcon->sec_level;
4517 l2cap_chan_ready(sk);
4518 }
4519
4520 bh_unlock_sock(sk);
4521 continue;
4522 }
4523
c1360a1c 4524 if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
6a8d3010
MH		 4525 bh_unlock_sock(sk);
4526 continue;
4527 }
4528
89bc500e
GP		 4529 if (!status && (chan->state == BT_CONNECTED ||
4530 chan->state == BT_CONFIG)) {
4343478f 4531 l2cap_check_encryption(chan, encrypt);
9719f8af
MH		 4532 bh_unlock_sock(sk);
4533 continue;
4534 }
4535
89bc500e 4536 if (chan->state == BT_CONNECT) {
b1235d79
MH		 4537 if (!status) {
4538 struct l2cap_conn_req req;
fe4128e0
GP		 4539 req.scid = cpu_to_le16(chan->scid);
4540 req.psm = chan->psm;
1da177e4 4541
fc7f8a7e 4542 chan->ident = l2cap_get_ident(conn);
c1360a1c 4543 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4 4544
fc7f8a7e 4545 l2cap_send_cmd(conn, chan->ident,
b1235d79
MH		 4546 L2CAP_CONN_REQ, sizeof(req), &req);
4547 } else {
c9b66675 4548 __clear_chan_timer(chan);
f3f668b0 4549 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
b1235d79 4550 }
89bc500e 4551 } else if (chan->state == BT_CONNECT2) {
b1235d79 4552 struct l2cap_conn_rsp rsp;
df3c3931 4553 __u16 res, stat;
1da177e4 4554
b1235d79 4555 if (!status) {
df3c3931
JH		 4556 if (bt_sk(sk)->defer_setup) {
4557 struct sock *parent = bt_sk(sk)->parent;
4558 res = L2CAP_CR_PEND;
4559 stat = L2CAP_CS_AUTHOR_PEND;
05e9a2f6
IK		 4560 if (parent)
4561 parent->sk_data_ready(parent, 0);
df3c3931 4562 } else {
05558911 4563 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 4564 res = L2CAP_CR_SUCCESS;
4565 stat = L2CAP_CS_NO_INFO;
4566 }
b1235d79 4567 } else {
89bc500e 4568 l2cap_state_change(chan, BT_DISCONN);
f3f668b0 4569 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
df3c3931
JH		 4570 res = L2CAP_CR_SEC_BLOCK;
4571 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 4572 }
4573
fe4128e0
GP		 4574 rsp.scid = cpu_to_le16(chan->dcid);
4575 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 4576 rsp.result = cpu_to_le16(res);
4577 rsp.status = cpu_to_le16(stat);
fc7f8a7e
GP		 4578 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
4579 sizeof(rsp), &rsp);
b1235d79 4580 }
1da177e4
LT		 4581
4582 bh_unlock_sock(sk);
4583 }
4584
3d57dc68 4585 rcu_read_unlock();
b1235d79 4586
1da177e4
LT		 4587 return 0;
4588}
4589
686ebf28 4590int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1da177e4
LT		 4591{
4592 struct l2cap_conn *conn = hcon->l2cap_data;
4593
5a08ecce
AE		 4594 if (!conn)
4595 conn = l2cap_conn_add(hcon, 0);
4596
4597 if (!conn)
1da177e4
LT		 4598 goto drop;
4599
4600 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4601
e702112f 4602 if (!(flags & ACL_CONT)) {
1da177e4 4603 struct l2cap_hdr *hdr;
48454079 4604 struct l2cap_chan *chan;
89794813 4605 u16 cid;
1da177e4
LT		 4606 int len;
4607
4608 if (conn->rx_len) {
4609 BT_ERR("Unexpected start frame (len %d)", skb->len);
4610 kfree_skb(conn->rx_skb);
4611 conn->rx_skb = NULL;
4612 conn->rx_len = 0;
4613 l2cap_conn_unreliable(conn, ECOMM);
4614 }
4615
aae7fe22
AE		 4616 /* Start fragment always begin with Basic L2CAP header */
4617 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 4618 BT_ERR("Frame is too short (len %d)", skb->len);
4619 l2cap_conn_unreliable(conn, ECOMM);
4620 goto drop;
4621 }
4622
4623 hdr = (struct l2cap_hdr *) skb->data;
4624 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
89794813 4625 cid = __le16_to_cpu(hdr->cid);
1da177e4
LT		 4626
4627 if (len == skb->len) {
4628 /* Complete frame received */
4629 l2cap_recv_frame(conn, skb);
4630 return 0;
4631 }
4632
4633 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4634
4635 if (skb->len > len) {
4636 BT_ERR("Frame is too long (len %d, expected len %d)",
4637 skb->len, len);
4638 l2cap_conn_unreliable(conn, ECOMM);
4639 goto drop;
4640 }
4641
baa7e1fa 4642 chan = l2cap_get_chan_by_scid(conn, cid);
89794813 4643
48454079
GP		 4644 if (chan && chan->sk) {
4645 struct sock *sk = chan->sk;
89794813 4646
0c1bc5c6 4647 if (chan->imtu < len - L2CAP_HDR_SIZE) {
48454079
GP		 4648 BT_ERR("Frame exceeding recv MTU (len %d, "
4649 "MTU %d)", len,
0c1bc5c6 4650 chan->imtu);
aa2ac881 4651 release_sock(sk);
48454079
GP		 4652 l2cap_conn_unreliable(conn, ECOMM);
4653 goto drop;
4654 }
aa2ac881 4655 release_sock(sk);
48454079 4656 }
89794813 4657
1da177e4 4658 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4659 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4660 if (!conn->rx_skb)
1da177e4
LT		 4661 goto drop;
4662
d626f62b 4663 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4664 skb->len);
1da177e4
LT		 4665 conn->rx_len = len - skb->len;
4666 } else {
4667 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4668
4669 if (!conn->rx_len) {
4670 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4671 l2cap_conn_unreliable(conn, ECOMM);
4672 goto drop;
4673 }
4674
4675 if (skb->len > conn->rx_len) {
4676 BT_ERR("Fragment is too long (len %d, expected %d)",
4677 skb->len, conn->rx_len);
4678 kfree_skb(conn->rx_skb);
4679 conn->rx_skb = NULL;
4680 conn->rx_len = 0;
4681 l2cap_conn_unreliable(conn, ECOMM);
4682 goto drop;
4683 }
4684
d626f62b 4685 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4686 skb->len);
1da177e4
LT		 4687 conn->rx_len -= skb->len;
4688
4689 if (!conn->rx_len) {
4690 /* Complete frame received */
4691 l2cap_recv_frame(conn, conn->rx_skb);
4692 conn->rx_skb = NULL;
4693 }
4694 }
4695
4696drop:
4697 kfree_skb(skb);
4698 return 0;
4699}
4700
aef7d97c 4701static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 4702{
23691d75 4703 struct l2cap_chan *c;
1da177e4 4704
23691d75 4705 read_lock_bh(&chan_list_lock);
1da177e4 4706
23691d75
GP		 4707 list_for_each_entry(c, &chan_list, global_l) {
4708 struct sock *sk = c->sk;
101545f6 4709
903d343e 4710 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
aef7d97c
MH		 4711 batostr(&bt_sk(sk)->src),
4712 batostr(&bt_sk(sk)->dst),
89bc500e 4713 c->state, __le16_to_cpu(c->psm),
23691d75
GP		 4714 c->scid, c->dcid, c->imtu, c->omtu,
4715 c->sec_level, c->mode);
05558911 4716}
1da177e4 4717
23691d75 4718 read_unlock_bh(&chan_list_lock);
1da177e4 4719
aef7d97c 4720 return 0;
1da177e4
LT		 4721}
4722
aef7d97c
MH		 4723static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4724{
4725 return single_open(file, l2cap_debugfs_show, inode->i_private);
4726}
4727
4728static const struct file_operations l2cap_debugfs_fops = {
4729 .open = l2cap_debugfs_open,
4730 .read = seq_read,
4731 .llseek = seq_lseek,
4732 .release = single_release,
4733};
4734
4735static struct dentry *l2cap_debugfs;
1da177e4 4736
64274518 4737int __init l2cap_init(void)
1da177e4
LT		 4738{
4739 int err;
be9d1227 4740
bb58f747 4741 err = l2cap_init_sockets();
1da177e4
LT		 4742 if (err < 0)
4743 return err;
4744
aef7d97c
MH		 4745 if (bt_debugfs) {
4746 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4747 bt_debugfs, NULL, &l2cap_debugfs_fops);
4748 if (!l2cap_debugfs)
4749 BT_ERR("Failed to create L2CAP debug file");
4750 }
1da177e4 4751
1da177e4 4752 return 0;
1da177e4
LT		 4753}
4754
64274518 4755void l2cap_exit(void)
1da177e4 4756{
aef7d97c 4757 debugfs_remove(l2cap_debugfs);
bb58f747 4758 l2cap_cleanup_sockets();
1da177e4
LT		 4759}
4760
d1c4a17d
GP		 4761module_param(disable_ertm, bool, 0644);
4762MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
kernel source for telekom puls (alcatel/mediatek)