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Bluetooth: Clean up logic in hci_cc_write_scan_enable
[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.
1da177e4
LT		 6
7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License version 2 as
11 published by the Free Software Foundation;
12
13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
16 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 17 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
18 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21
8e87d142
YH		 22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 24 SOFTWARE IS DISCLAIMED.
25*/
26
bb58f747 27/* Bluetooth L2CAP core. */
1da177e4 28
1da177e4
LT		 29#include <linux/module.h>
30
31#include <linux/types.h>
4fc268d2 32#include <linux/capability.h>
1da177e4
LT		 33#include <linux/errno.h>
34#include <linux/kernel.h>
1da177e4
LT		 35#include <linux/sched.h>
36#include <linux/slab.h>
37#include <linux/poll.h>
38#include <linux/fcntl.h>
39#include <linux/init.h>
40#include <linux/interrupt.h>
41#include <linux/socket.h>
42#include <linux/skbuff.h>
1da177e4 43#include <linux/list.h>
be9d1227 44#include <linux/device.h>
aef7d97c
MH		 45#include <linux/debugfs.h>
46#include <linux/seq_file.h>
af05b30b 47#include <linux/uaccess.h>
fcc203c3 48#include <linux/crc16.h>
1da177e4
LT		 49#include <net/sock.h>
50
51#include <asm/system.h>
1da177e4
LT		 52#include <asm/unaligned.h>
53
54#include <net/bluetooth/bluetooth.h>
55#include <net/bluetooth/hci_core.h>
56#include <net/bluetooth/l2cap.h>
b501d6a1 57#include <net/bluetooth/smp.h>
1da177e4 58
bb58f747 59int disable_ertm;
a5fd6f30 60int enable_hs;
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
GP		 79
80static inline void chan_hold(struct l2cap_chan *c)
81{
82 atomic_inc(&c->refcnt);
83}
84
85static inline void chan_put(struct l2cap_chan *c)
86{
87 if (atomic_dec_and_test(&c->refcnt))
88 kfree(c);
89}
90
baa7e1fa 91static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
0139418c 92{
48454079 93 struct l2cap_chan *c;
baa7e1fa
GP		 94
95 list_for_each_entry(c, &conn->chan_l, list) {
fe4128e0 96 if (c->dcid == cid)
baa7e1fa 97 return c;
0139418c 98 }
baa7e1fa
GP		 99 return NULL;
100
0139418c
MH		 101}
102
baa7e1fa 103static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
0139418c 104{
48454079 105 struct l2cap_chan *c;
baa7e1fa
GP		 106
107 list_for_each_entry(c, &conn->chan_l, list) {
fe4128e0 108 if (c->scid == cid)
baa7e1fa 109 return c;
0139418c 110 }
baa7e1fa 111 return NULL;
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
GP		 119
120 read_lock(&conn->chan_lock);
121 c = __l2cap_get_chan_by_scid(conn, cid);
48454079
GP		 122 if (c)
123 bh_lock_sock(c->sk);
baa7e1fa 124 read_unlock(&conn->chan_lock);
48454079 125 return c;
0139418c
MH		 126}
127
baa7e1fa 128static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 129{
48454079 130 struct l2cap_chan *c;
baa7e1fa
GP		 131
132 list_for_each_entry(c, &conn->chan_l, list) {
fc7f8a7e 133 if (c->ident == ident)
baa7e1fa 134 return c;
0139418c 135 }
baa7e1fa 136 return NULL;
0139418c
MH		 137}
138
baa7e1fa 139static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
0139418c 140{
48454079 141 struct l2cap_chan *c;
baa7e1fa
GP		 142
143 read_lock(&conn->chan_lock);
144 c = __l2cap_get_chan_by_ident(conn, ident);
48454079
GP		 145 if (c)
146 bh_lock_sock(c->sk);
baa7e1fa 147 read_unlock(&conn->chan_lock);
48454079 148 return c;
0139418c
MH		 149}
150
23691d75 151static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
9e4425ff 152{
23691d75 153 struct l2cap_chan *c;
9e4425ff 154
23691d75
GP		 155 list_for_each_entry(c, &chan_list, global_l) {
156 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
9e4425ff
GP		 157 goto found;
158 }
159
23691d75 160 c = NULL;
9e4425ff 161found:
23691d75 162 return c;
9e4425ff
GP		 163}
164
165int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
166{
73b2ec18
GP		 167 int err;
168
23691d75 169 write_lock_bh(&chan_list_lock);
9e4425ff 170
23691d75 171 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
73b2ec18
GP		 172 err = -EADDRINUSE;
173 goto done;
9e4425ff
GP		 174 }
175
73b2ec18
GP		 176 if (psm) {
177 chan->psm = psm;
178 chan->sport = psm;
179 err = 0;
180 } else {
181 u16 p;
182
183 err = -EINVAL;
184 for (p = 0x1001; p < 0x1100; p += 2)
23691d75 185 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
73b2ec18
GP		 186 chan->psm = cpu_to_le16(p);
187 chan->sport = cpu_to_le16(p);
188 err = 0;
189 break;
190 }
191 }
9e4425ff 192
73b2ec18 193done:
23691d75 194 write_unlock_bh(&chan_list_lock);
73b2ec18 195 return err;
9e4425ff
GP		 196}
197
198int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
199{
23691d75 200 write_lock_bh(&chan_list_lock);
9e4425ff
GP		 201
202 chan->scid = scid;
203
23691d75 204 write_unlock_bh(&chan_list_lock);
9e4425ff
GP		 205
206 return 0;
207}
208
baa7e1fa 209static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
0139418c 210{
8db4dc46 211 u16 cid = L2CAP_CID_DYN_START;
0139418c 212
8db4dc46 213 for (; cid < L2CAP_CID_DYN_END; cid++) {
baa7e1fa 214 if (!__l2cap_get_chan_by_scid(conn, cid))
0139418c
MH		 215 return cid;
216 }
217
218 return 0;
219}
220
c9b66675 221static void l2cap_set_timer(struct l2cap_chan *chan, struct timer_list *timer, long timeout)
ab07801d 222{
457f4850 223 BT_DBG("chan %p state %d timeout %ld", chan, chan->state, timeout);
89bc500e 224
942ecc9c 225 if (!mod_timer(timer, jiffies + msecs_to_jiffies(timeout)))
774e5651 226 chan_hold(chan);
ab07801d
GP		 227}
228
c9b66675 229static void l2cap_clear_timer(struct l2cap_chan *chan, struct timer_list *timer)
ab07801d 230{
774e5651 231 BT_DBG("chan %p state %d", chan, chan->state);
ab07801d 232
774e5651
MM		 233 if (timer_pending(timer) && del_timer(timer))
234 chan_put(chan);
ab07801d
GP		 235}
236
89bc500e
GP		 237static void l2cap_state_change(struct l2cap_chan *chan, int state)
238{
239 chan->state = state;
240 chan->ops->state_change(chan->data, state);
241}
242
ab07801d
GP		 243static void l2cap_chan_timeout(unsigned long arg)
244{
245 struct l2cap_chan *chan = (struct l2cap_chan *) arg;
246 struct sock *sk = chan->sk;
247 int reason;
248
89bc500e 249 BT_DBG("chan %p state %d", chan, chan->state);
ab07801d
GP		 250
251 bh_lock_sock(sk);
252
253 if (sock_owned_by_user(sk)) {
254 /* sk is owned by user. Try again later */
c9b66675 255 __set_chan_timer(chan, HZ / 5);
ab07801d 256 bh_unlock_sock(sk);
71ba0e56 257 chan_put(chan);
ab07801d
GP		 258 return;
259 }
260
89bc500e 261 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
ab07801d 262 reason = ECONNREFUSED;
89bc500e 263 else if (chan->state == BT_CONNECT &&
ab07801d
GP		 264 chan->sec_level != BT_SECURITY_SDP)
265 reason = ECONNREFUSED;
266 else
267 reason = ETIMEDOUT;
268
0f852724 269 l2cap_chan_close(chan, reason);
ab07801d
GP		 270
271 bh_unlock_sock(sk);
272
ba3bd0ee 273 chan->ops->close(chan->data);
71ba0e56 274 chan_put(chan);
ab07801d
GP		 275}
276
23691d75 277struct l2cap_chan *l2cap_chan_create(struct sock *sk)
48454079
GP		 278{
279 struct l2cap_chan *chan;
280
281 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
282 if (!chan)
283 return NULL;
284
285 chan->sk = sk;
286
23691d75
GP		 287 write_lock_bh(&chan_list_lock);
288 list_add(&chan->global_l, &chan_list);
289 write_unlock_bh(&chan_list_lock);
290
ab07801d
GP		 291 setup_timer(&chan->chan_timer, l2cap_chan_timeout, (unsigned long) chan);
292
89bc500e
GP		 293 chan->state = BT_OPEN;
294
71ba0e56
GP		 295 atomic_set(&chan->refcnt, 1);
296
abc545b8
SJ		 297 BT_DBG("sk %p chan %p", sk, chan);
298
48454079
GP		 299 return chan;
300}
301
23691d75 302void l2cap_chan_destroy(struct l2cap_chan *chan)
6ff5abbf 303{
23691d75
GP		 304 write_lock_bh(&chan_list_lock);
305 list_del(&chan->global_l);
306 write_unlock_bh(&chan_list_lock);
307
71ba0e56 308 chan_put(chan);
6ff5abbf
GP		 309}
310
48454079 311static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
0139418c 312{
af05b30b 313 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
fe4128e0 314 chan->psm, chan->dcid);
0139418c 315
2950f21a
MH		 316 conn->disc_reason = 0x13;
317
8c1d787b 318 chan->conn = conn;
0139418c 319
715ec005 320 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
b62f328b
VT		 321 if (conn->hcon->type == LE_LINK) {
322 /* LE connection */
0c1bc5c6 323 chan->omtu = L2CAP_LE_DEFAULT_MTU;
fe4128e0
GP		 324 chan->scid = L2CAP_CID_LE_DATA;
325 chan->dcid = L2CAP_CID_LE_DATA;
b62f328b
VT		 326 } else {
327 /* Alloc CID for connection-oriented socket */
fe4128e0 328 chan->scid = l2cap_alloc_cid(conn);
0c1bc5c6 329 chan->omtu = L2CAP_DEFAULT_MTU;
b62f328b 330 }
715ec005 331 } else if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
0139418c 332 /* Connectionless socket */
fe4128e0
GP		 333 chan->scid = L2CAP_CID_CONN_LESS;
334 chan->dcid = L2CAP_CID_CONN_LESS;
0c1bc5c6 335 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 336 } else {
337 /* Raw socket can send/recv signalling messages only */
fe4128e0
GP		 338 chan->scid = L2CAP_CID_SIGNALING;
339 chan->dcid = L2CAP_CID_SIGNALING;
0c1bc5c6 340 chan->omtu = L2CAP_DEFAULT_MTU;
0139418c
MH		 341 }
342
8f7975b1
AE		 343 chan->local_id = L2CAP_BESTEFFORT_ID;
344 chan->local_stype = L2CAP_SERV_BESTEFFORT;
345 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
346 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
347 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
348 chan->local_flush_to = L2CAP_DEFAULT_FLUSH_TO;
349
71ba0e56 350 chan_hold(chan);
baa7e1fa
GP		 351
352 list_add(&chan->list, &conn->chan_l);
0139418c
MH		 353}
354
8e87d142 355/* Delete channel.
0139418c 356 * Must be called on the locked socket. */
4519de9a 357static void l2cap_chan_del(struct l2cap_chan *chan, int err)
0139418c 358{
48454079 359 struct sock *sk = chan->sk;
8c1d787b 360 struct l2cap_conn *conn = chan->conn;
0139418c
MH		 361 struct sock *parent = bt_sk(sk)->parent;
362
c9b66675 363 __clear_chan_timer(chan);
0139418c 364
49208c9c 365 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
0139418c 366
8e87d142 367 if (conn) {
baa7e1fa
GP		 368 /* Delete from channel list */
369 write_lock_bh(&conn->chan_lock);
370 list_del(&chan->list);
371 write_unlock_bh(&conn->chan_lock);
71ba0e56 372 chan_put(chan);
baa7e1fa 373
8c1d787b 374 chan->conn = NULL;
0139418c
MH		 375 hci_conn_put(conn->hcon);
376 }
377
89bc500e 378 l2cap_state_change(chan, BT_CLOSED);
0139418c
MH		 379 sock_set_flag(sk, SOCK_ZAPPED);
380
381 if (err)
382 sk->sk_err = err;
383
384 if (parent) {
385 bt_accept_unlink(sk);
386 parent->sk_data_ready(parent, 0);
387 } else
388 sk->sk_state_change(sk);
c13ffa62 389
c1360a1c
GP		 390 if (!(test_bit(CONF_OUTPUT_DONE, &chan->conf_state) &&
391 test_bit(CONF_INPUT_DONE, &chan->conf_state)))
6ff5abbf 392 return;
2ead70b8 393
58d35f87 394 skb_queue_purge(&chan->tx_q);
c13ffa62 395
0c1bc5c6 396 if (chan->mode == L2CAP_MODE_ERTM) {
c13ffa62
GP		 397 struct srej_list *l, *tmp;
398
1a09bcb9
GP		 399 __clear_retrans_timer(chan);
400 __clear_monitor_timer(chan);
401 __clear_ack_timer(chan);
c13ffa62 402
f1c6775b 403 skb_queue_purge(&chan->srej_q);
c13ffa62 404
39d5a3ee 405 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
c13ffa62
GP		 406 list_del(&l->list);
407 kfree(l);
408 }
409 }
0139418c
MH		 410}
411
4519de9a
GP		 412static void l2cap_chan_cleanup_listen(struct sock *parent)
413{
414 struct sock *sk;
415
416 BT_DBG("parent %p", parent);
417
418 /* Close not yet accepted channels */
0f852724 419 while ((sk = bt_accept_dequeue(parent, NULL))) {
ba3bd0ee 420 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
c9b66675 421 __clear_chan_timer(chan);
0f852724 422 lock_sock(sk);
ba3bd0ee 423 l2cap_chan_close(chan, ECONNRESET);
0f852724 424 release_sock(sk);
ba3bd0ee 425 chan->ops->close(chan->data);
0f852724 426 }
4519de9a
GP		 427}
428
0f852724 429void l2cap_chan_close(struct l2cap_chan *chan, int reason)
4519de9a
GP		 430{
431 struct l2cap_conn *conn = chan->conn;
432 struct sock *sk = chan->sk;
433
89bc500e 434 BT_DBG("chan %p state %d socket %p", chan, chan->state, sk->sk_socket);
4519de9a 435
89bc500e 436 switch (chan->state) {
4519de9a
GP		 437 case BT_LISTEN:
438 l2cap_chan_cleanup_listen(sk);
89bc500e
GP		 439
440 l2cap_state_change(chan, BT_CLOSED);
441 sock_set_flag(sk, SOCK_ZAPPED);
4519de9a
GP		 442 break;
443
444 case BT_CONNECTED:
445 case BT_CONFIG:
715ec005 446 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a 447 conn->hcon->type == ACL_LINK) {
c9b66675
GP		 448 __clear_chan_timer(chan);
449 __set_chan_timer(chan, sk->sk_sndtimeo);
4519de9a
GP		 450 l2cap_send_disconn_req(conn, chan, reason);
451 } else
452 l2cap_chan_del(chan, reason);
453 break;
454
455 case BT_CONNECT2:
715ec005 456 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
4519de9a
GP		 457 conn->hcon->type == ACL_LINK) {
458 struct l2cap_conn_rsp rsp;
459 __u16 result;
460
461 if (bt_sk(sk)->defer_setup)
462 result = L2CAP_CR_SEC_BLOCK;
463 else
464 result = L2CAP_CR_BAD_PSM;
89bc500e 465 l2cap_state_change(chan, BT_DISCONN);
4519de9a
GP		 466
467 rsp.scid = cpu_to_le16(chan->dcid);
468 rsp.dcid = cpu_to_le16(chan->scid);
469 rsp.result = cpu_to_le16(result);
470 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
471 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
472 sizeof(rsp), &rsp);
473 }
474
475 l2cap_chan_del(chan, reason);
476 break;
477
478 case BT_CONNECT:
479 case BT_DISCONN:
480 l2cap_chan_del(chan, reason);
481 break;
482
483 default:
484 sock_set_flag(sk, SOCK_ZAPPED);
485 break;
486 }
487}
488
4343478f 489static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
79d554a6 490{
715ec005 491 if (chan->chan_type == L2CAP_CHAN_RAW) {
4343478f 492 switch (chan->sec_level) {
8556edd3
JH		 493 case BT_SECURITY_HIGH:
494 return HCI_AT_DEDICATED_BONDING_MITM;
495 case BT_SECURITY_MEDIUM:
496 return HCI_AT_DEDICATED_BONDING;
497 default:
498 return HCI_AT_NO_BONDING;
499 }
fe4128e0 500 } else if (chan->psm == cpu_to_le16(0x0001)) {
4343478f
GP		 501 if (chan->sec_level == BT_SECURITY_LOW)
502 chan->sec_level = BT_SECURITY_SDP;
0684e5f9 503
4343478f 504 if (chan->sec_level == BT_SECURITY_HIGH)
8556edd3 505 return HCI_AT_NO_BONDING_MITM;
00ae4af9 506 else
8556edd3 507 return HCI_AT_NO_BONDING;
00ae4af9 508 } else {
4343478f 509 switch (chan->sec_level) {
00ae4af9 510 case BT_SECURITY_HIGH:
8556edd3 511 return HCI_AT_GENERAL_BONDING_MITM;
00ae4af9 512 case BT_SECURITY_MEDIUM:
8556edd3 513 return HCI_AT_GENERAL_BONDING;
00ae4af9 514 default:
8556edd3 515 return HCI_AT_NO_BONDING;
00ae4af9 516 }
0684e5f9 517 }
8556edd3
JH		 518}
519
520/* Service level security */
4343478f 521static inline int l2cap_check_security(struct l2cap_chan *chan)
8556edd3 522{
8c1d787b 523 struct l2cap_conn *conn = chan->conn;
8556edd3
JH		 524 __u8 auth_type;
525
4343478f 526 auth_type = l2cap_get_auth_type(chan);
79d554a6 527
4343478f 528 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
79d554a6
MH		 529}
530
b5ad8b7f 531static u8 l2cap_get_ident(struct l2cap_conn *conn)
4e8402a3
MH		 532{
533 u8 id;
534
535 /* Get next available identificator.
536 * 1 - 128 are used by kernel.
537 * 129 - 199 are reserved.
538 * 200 - 254 are used by utilities like l2ping, etc.
539 */
540
541 spin_lock_bh(&conn->lock);
542
543 if (++conn->tx_ident > 128)
544 conn->tx_ident = 1;
545
546 id = conn->tx_ident;
547
548 spin_unlock_bh(&conn->lock);
549
550 return id;
551}
552
4519de9a 553static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 554{
555 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
e702112f 556 u8 flags;
4e8402a3
MH		 557
558 BT_DBG("code 0x%2.2x", code);
559
560 if (!skb)
9a9c6a34 561 return;
4e8402a3 562
e702112f
AE		 563 if (lmp_no_flush_capable(conn->hcon->hdev))
564 flags = ACL_START_NO_FLUSH;
565 else
566 flags = ACL_START;
567
14b12d0b 568 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
5e59b791 569 skb->priority = HCI_PRIO_MAX;
14b12d0b 570
73d80deb
LAD		 571 hci_send_acl(conn->hchan, skb, flags);
572}
573
574static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
575{
576 struct hci_conn *hcon = chan->conn->hcon;
577 u16 flags;
578
579 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
580 skb->priority);
581
582 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
583 lmp_no_flush_capable(hcon->hdev))
584 flags = ACL_START_NO_FLUSH;
585 else
586 flags = ACL_START;
587
588 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
589 hci_send_acl(chan->conn->hchan, skb, flags);
4e8402a3
MH		 590}
591
88843ab0 592static inline void l2cap_send_sframe(struct l2cap_chan *chan, u32 control)
1c2acffb
GP		 593{
594 struct sk_buff *skb;
595 struct l2cap_hdr *lh;
8c1d787b 596 struct l2cap_conn *conn = chan->conn;
e4ca6d98 597 int count, hlen;
fcc203c3 598
89bc500e 599 if (chan->state != BT_CONNECTED)
c13ffa62
GP		 600 return;
601
e4ca6d98
AE		 602 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
603 hlen = L2CAP_EXT_HDR_SIZE;
604 else
605 hlen = L2CAP_ENH_HDR_SIZE;
606
47d1ec61 607 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 608 hlen += L2CAP_FCS_SIZE;
1c2acffb 609
88843ab0 610 BT_DBG("chan %p, control 0x%8.8x", chan, control);
1c2acffb 611
fcc203c3 612 count = min_t(unsigned int, conn->mtu, hlen);
793c2f1c
AE		 613
614 control |= __set_sframe(chan);
1c2acffb 615
e2ab4353 616 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
03f6715d 617 control |= __set_ctrl_final(chan);
9e917af1 618
e2ab4353 619 if (test_and_clear_bit(CONN_SEND_PBIT, &chan->conn_state))
e3781735 620 control |= __set_ctrl_poll(chan);
f0946ccf 621
1c2acffb
GP		 622 skb = bt_skb_alloc(count, GFP_ATOMIC);
623 if (!skb)
9a9c6a34 624 return;
1c2acffb
GP		 625
626 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fcc203c3 627 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
fe4128e0 628 lh->cid = cpu_to_le16(chan->dcid);
88843ab0
AE		 629
630 __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
1c2acffb 631
47d1ec61 632 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 633 u16 fcs = crc16(0, (u8 *)lh, count - L2CAP_FCS_SIZE);
634 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3
GP		 635 }
636
73d80deb
LAD		 637 skb->priority = HCI_PRIO_MAX;
638 l2cap_do_send(chan, skb);
1c2acffb
GP		 639}
640
88843ab0 641static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u32 control)
7e743090 642{
e2ab4353 643 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 644 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
e2ab4353 645 set_bit(CONN_RNR_SENT, &chan->conn_state);
1890d36b 646 } else
ab784b73 647 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
7e743090 648
0b209fae 649 control |= __set_reqseq(chan, chan->buffer_seq);
2ab25cdd 650
525cd185 651 l2cap_send_sframe(chan, control);
7e743090
GP		 652}
653
b4450035 654static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
e501d055 655{
c1360a1c 656 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
e501d055
AE		 657}
658
fc7f8a7e 659static void l2cap_do_start(struct l2cap_chan *chan)
79d554a6 660{
8c1d787b 661 struct l2cap_conn *conn = chan->conn;
79d554a6
MH		 662
663 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 664 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
665 return;
666
4343478f
GP		 667 if (l2cap_check_security(chan) &&
668 __l2cap_no_conn_pending(chan)) {
b1235d79 669 struct l2cap_conn_req req;
fe4128e0
GP		 670 req.scid = cpu_to_le16(chan->scid);
671 req.psm = chan->psm;
79d554a6 672
fc7f8a7e 673 chan->ident = l2cap_get_ident(conn);
c1360a1c 674 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
79d554a6 675
fc7f8a7e
GP		 676 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
677 sizeof(req), &req);
b1235d79 678 }
79d554a6
MH		 679 } else {
680 struct l2cap_info_req req;
681 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
682
683 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
684 conn->info_ident = l2cap_get_ident(conn);
685
686 mod_timer(&conn->info_timer, jiffies +
687 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
688
689 l2cap_send_cmd(conn, conn->info_ident,
690 L2CAP_INFO_REQ, sizeof(req), &req);
691 }
692}
693
cf6c2c0b
GP		 694static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
695{
696 u32 local_feat_mask = l2cap_feat_mask;
d1c4a17d 697 if (!disable_ertm)
cf6c2c0b
GP		 698 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
699
700 switch (mode) {
701 case L2CAP_MODE_ERTM:
702 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
703 case L2CAP_MODE_STREAMING:
704 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
705 default:
706 return 0x00;
707 }
708}
709
4519de9a 710static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
22121fc9 711{
e92c8e70 712 struct sock *sk;
22121fc9
GP		 713 struct l2cap_disconn_req req;
714
c13ffa62
GP		 715 if (!conn)
716 return;
717
e92c8e70
GP		 718 sk = chan->sk;
719
0c1bc5c6 720 if (chan->mode == L2CAP_MODE_ERTM) {
1a09bcb9
GP		 721 __clear_retrans_timer(chan);
722 __clear_monitor_timer(chan);
723 __clear_ack_timer(chan);
c13ffa62
GP		 724 }
725
fe4128e0
GP		 726 req.dcid = cpu_to_le16(chan->dcid);
727 req.scid = cpu_to_le16(chan->scid);
22121fc9
GP		 728 l2cap_send_cmd(conn, l2cap_get_ident(conn),
729 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62 730
89bc500e 731 l2cap_state_change(chan, BT_DISCONN);
9b108fc0 732 sk->sk_err = err;
22121fc9
GP		 733}
734
1da177e4 735/* ---- L2CAP connections ---- */
4e8402a3
MH		 736static void l2cap_conn_start(struct l2cap_conn *conn)
737{
820ffdb3 738 struct l2cap_chan *chan, *tmp;
4e8402a3
MH		 739
740 BT_DBG("conn %p", conn);
741
baa7e1fa 742 read_lock(&conn->chan_lock);
4e8402a3 743
820ffdb3 744 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
48454079 745 struct sock *sk = chan->sk;
baa7e1fa 746
4e8402a3
MH		 747 bh_lock_sock(sk);
748
715ec005 749 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
79d554a6
MH		 750 bh_unlock_sock(sk);
751 continue;
752 }
753
89bc500e 754 if (chan->state == BT_CONNECT) {
47731de7 755 struct l2cap_conn_req req;
79d554a6 756
4343478f 757 if (!l2cap_check_security(chan) ||
b4450035 758 !__l2cap_no_conn_pending(chan)) {
47731de7
GP		 759 bh_unlock_sock(sk);
760 continue;
761 }
79d554a6 762
c1360a1c
GP		 763 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
764 && test_bit(CONF_STATE2_DEVICE,
765 &chan->conf_state)) {
0f852724 766 /* l2cap_chan_close() calls list_del(chan)
820ffdb3 767 * so release the lock */
2461daac 768 read_unlock(&conn->chan_lock);
89bc500e 769 l2cap_chan_close(chan, ECONNRESET);
2461daac 770 read_lock(&conn->chan_lock);
47731de7
GP		 771 bh_unlock_sock(sk);
772 continue;
b1235d79 773 }
47731de7 774
fe4128e0
GP		 775 req.scid = cpu_to_le16(chan->scid);
776 req.psm = chan->psm;
47731de7 777
fc7f8a7e 778 chan->ident = l2cap_get_ident(conn);
c1360a1c 779 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
47731de7 780
fc7f8a7e
GP		 781 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
782 sizeof(req), &req);
47731de7 783
89bc500e 784 } else if (chan->state == BT_CONNECT2) {
79d554a6 785 struct l2cap_conn_rsp rsp;
e9aeb2dd 786 char buf[128];
fe4128e0
GP		 787 rsp.scid = cpu_to_le16(chan->dcid);
788 rsp.dcid = cpu_to_le16(chan->scid);
79d554a6 789
4343478f 790 if (l2cap_check_security(chan)) {
f66dc81f
MH		 791 if (bt_sk(sk)->defer_setup) {
792 struct sock *parent = bt_sk(sk)->parent;
793 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
794 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
05e9a2f6
IK		 795 if (parent)
796 parent->sk_data_ready(parent, 0);
f66dc81f
MH		 797
798 } else {
89bc500e 799 l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 800 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
801 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
802 }
79d554a6
MH		 803 } else {
804 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
805 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
806 }
807
fc7f8a7e
GP		 808 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
809 sizeof(rsp), &rsp);
e9aeb2dd 810
c1360a1c 811 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
e9aeb2dd
GP		 812 rsp.result != L2CAP_CR_SUCCESS) {
813 bh_unlock_sock(sk);
814 continue;
815 }
816
c1360a1c 817 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 818 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 819 l2cap_build_conf_req(chan, buf), buf);
820 chan->num_conf_req++;
4e8402a3
MH		 821 }
822
823 bh_unlock_sock(sk);
824 }
825
baa7e1fa 826 read_unlock(&conn->chan_lock);
4e8402a3
MH		 827}
828
b62f328b
VT		 829/* Find socket with cid and source bdaddr.
830 * Returns closest match, locked.
831 */
23691d75 832static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src)
b62f328b 833{
23691d75 834 struct l2cap_chan *c, *c1 = NULL;
b62f328b 835
23691d75 836 read_lock(&chan_list_lock);
b62f328b 837
23691d75
GP		 838 list_for_each_entry(c, &chan_list, global_l) {
839 struct sock *sk = c->sk;
fe4128e0 840
89bc500e 841 if (state && c->state != state)
b62f328b
VT		 842 continue;
843
23691d75 844 if (c->scid == cid) {
b62f328b 845 /* Exact match. */
23691d75
GP		 846 if (!bacmp(&bt_sk(sk)->src, src)) {
847 read_unlock(&chan_list_lock);
848 return c;
849 }
b62f328b
VT		 850
851 /* Closest match */
852 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
23691d75 853 c1 = c;
b62f328b
VT		 854 }
855 }
280f294f 856
23691d75 857 read_unlock(&chan_list_lock);
b62f328b 858
23691d75 859 return c1;
b62f328b
VT		 860}
861
862static void l2cap_le_conn_ready(struct l2cap_conn *conn)
863{
c916fbe4 864 struct sock *parent, *sk;
23691d75 865 struct l2cap_chan *chan, *pchan;
b62f328b
VT		 866
867 BT_DBG("");
868
869 /* Check if we have socket listening on cid */
23691d75 870 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
b62f328b 871 conn->src);
23691d75 872 if (!pchan)
b62f328b
VT		 873 return;
874
23691d75
GP		 875 parent = pchan->sk;
876
62f3a2cf
GP		 877 bh_lock_sock(parent);
878
b62f328b
VT		 879 /* Check for backlog size */
880 if (sk_acceptq_is_full(parent)) {
881 BT_DBG("backlog full %d", parent->sk_ack_backlog);
882 goto clean;
883 }
884
80808e43
GP		 885 chan = pchan->ops->new_connection(pchan->data);
886 if (!chan)
b62f328b
VT		 887 goto clean;
888
80808e43 889 sk = chan->sk;
5d41ce1d 890
baa7e1fa 891 write_lock_bh(&conn->chan_lock);
b62f328b
VT		 892
893 hci_conn_hold(conn->hcon);
894
b62f328b
VT		 895 bacpy(&bt_sk(sk)->src, conn->src);
896 bacpy(&bt_sk(sk)->dst, conn->dst);
897
d1010240
GP		 898 bt_accept_enqueue(parent, sk);
899
48454079
GP		 900 __l2cap_chan_add(conn, chan);
901
c9b66675 902 __set_chan_timer(chan, sk->sk_sndtimeo);
b62f328b 903
89bc500e 904 l2cap_state_change(chan, BT_CONNECTED);
b62f328b
VT		 905 parent->sk_data_ready(parent, 0);
906
baa7e1fa 907 write_unlock_bh(&conn->chan_lock);
b62f328b
VT		 908
909clean:
910 bh_unlock_sock(parent);
911}
912
f1cb9af5
VCG		 913static void l2cap_chan_ready(struct sock *sk)
914{
915 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
916 struct sock *parent = bt_sk(sk)->parent;
917
918 BT_DBG("sk %p, parent %p", sk, parent);
919
920 chan->conf_state = 0;
921 __clear_chan_timer(chan);
922
43f3dc41 923 l2cap_state_change(chan, BT_CONNECTED);
f1cb9af5
VCG		 924 sk->sk_state_change(sk);
925
926 if (parent)
927 parent->sk_data_ready(parent, 0);
928}
929
4e8402a3
MH		 930static void l2cap_conn_ready(struct l2cap_conn *conn)
931{
48454079 932 struct l2cap_chan *chan;
4e8402a3 933
79d554a6 934 BT_DBG("conn %p", conn);
4e8402a3 935
b62f328b
VT		 936 if (!conn->hcon->out && conn->hcon->type == LE_LINK)
937 l2cap_le_conn_ready(conn);
938
160dc6ac
VCG		 939 if (conn->hcon->out && conn->hcon->type == LE_LINK)
940 smp_conn_security(conn, conn->hcon->pending_sec_level);
941
baa7e1fa 942 read_lock(&conn->chan_lock);
4e8402a3 943
baa7e1fa 944 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 945 struct sock *sk = chan->sk;
baa7e1fa 946
79d554a6 947 bh_lock_sock(sk);
4e8402a3 948
63128451 949 if (conn->hcon->type == LE_LINK) {
b501d6a1 950 if (smp_conn_security(conn, chan->sec_level))
f1cb9af5 951 l2cap_chan_ready(sk);
acd7d370 952
63128451 953 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 954 __clear_chan_timer(chan);
89bc500e 955 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 956 sk->sk_state_change(sk);
b501d6a1 957
89bc500e 958 } else if (chan->state == BT_CONNECT)
fc7f8a7e 959 l2cap_do_start(chan);
4e8402a3 960
79d554a6 961 bh_unlock_sock(sk);
4e8402a3 962 }
79d554a6 963
baa7e1fa 964 read_unlock(&conn->chan_lock);
4e8402a3
MH		 965}
966
967/* Notify sockets that we cannot guaranty reliability anymore */
968static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
969{
48454079 970 struct l2cap_chan *chan;
4e8402a3
MH		 971
972 BT_DBG("conn %p", conn);
973
baa7e1fa 974 read_lock(&conn->chan_lock);
4e8402a3 975
baa7e1fa 976 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 977 struct sock *sk = chan->sk;
baa7e1fa 978
ecf61bdb 979 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
4e8402a3
MH		 980 sk->sk_err = err;
981 }
982
baa7e1fa 983 read_unlock(&conn->chan_lock);
4e8402a3
MH		 984}
985
986static void l2cap_info_timeout(unsigned long arg)
987{
988 struct l2cap_conn *conn = (void *) arg;
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;
1012 bh_lock_sock(sk);
1013 l2cap_chan_del(chan, err);
1014 bh_unlock_sock(sk);
1015 chan->ops->close(chan->data);
1016 }
1017
73d80deb
LAD		 1018 hci_chan_del(conn->hchan);
1019
5d3de7df
VCG		 1020 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1021 del_timer_sync(&conn->info_timer);
1022
d26a2345 1023 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend)) {
5d3de7df 1024 del_timer(&conn->security_timer);
8aab4757 1025 smp_chan_destroy(conn);
d26a2345 1026 }
5d3de7df
VCG		 1027
1028 hcon->l2cap_data = NULL;
1029 kfree(conn);
1030}
1031
1032static void security_timeout(unsigned long arg)
1033{
1034 struct l2cap_conn *conn = (void *) arg;
1035
1036 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1037}
1038
1da177e4
LT		 1039static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
1040{
0139418c 1041 struct l2cap_conn *conn = hcon->l2cap_data;
73d80deb 1042 struct hci_chan *hchan;
1da177e4 1043
0139418c 1044 if (conn || status)
1da177e4
LT		 1045 return conn;
1046
73d80deb
LAD		 1047 hchan = hci_chan_create(hcon);
1048 if (!hchan)
1049 return NULL;
1050
0139418c 1051 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
73d80deb
LAD		 1052 if (!conn) {
1053 hci_chan_del(hchan);
1da177e4 1054 return NULL;
73d80deb 1055 }
1da177e4
LT		 1056
1057 hcon->l2cap_data = conn;
1058 conn->hcon = hcon;
73d80deb 1059 conn->hchan = hchan;
1da177e4 1060
73d80deb 1061 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
0139418c 1062
acd7d370
VT		 1063 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
1064 conn->mtu = hcon->hdev->le_mtu;
1065 else
1066 conn->mtu = hcon->hdev->acl_mtu;
1067
1da177e4
LT		 1068 conn->src = &hcon->hdev->bdaddr;
1069 conn->dst = &hcon->dst;
1070
4e8402a3
MH		 1071 conn->feat_mask = 0;
1072
1da177e4 1073 spin_lock_init(&conn->lock);
baa7e1fa
GP		 1074 rwlock_init(&conn->chan_lock);
1075
1076 INIT_LIST_HEAD(&conn->chan_l);
1da177e4 1077
5d3de7df
VCG		 1078 if (hcon->type == LE_LINK)
1079 setup_timer(&conn->security_timer, security_timeout,
1080 (unsigned long) conn);
1081 else
b62f328b 1082 setup_timer(&conn->info_timer, l2cap_info_timeout,
45054dc1
DY		 1083 (unsigned long) conn);
1084
2950f21a
MH		 1085 conn->disc_reason = 0x13;
1086
1da177e4
LT		 1087 return conn;
1088}
1089
48454079 1090static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
1da177e4 1091{
baa7e1fa 1092 write_lock_bh(&conn->chan_lock);
48454079 1093 __l2cap_chan_add(conn, chan);
baa7e1fa 1094 write_unlock_bh(&conn->chan_lock);
1da177e4
LT		 1095}
1096
1da177e4 1097/* ---- Socket interface ---- */
1da177e4
LT		 1098
1099/* Find socket with psm and source bdaddr.
1100 * Returns closest match.
1101 */
23691d75 1102static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4 1103{
23691d75 1104 struct l2cap_chan *c, *c1 = NULL;
1da177e4 1105
23691d75 1106 read_lock(&chan_list_lock);
e0f0cb56 1107
23691d75
GP		 1108 list_for_each_entry(c, &chan_list, global_l) {
1109 struct sock *sk = c->sk;
fe4128e0 1110
89bc500e 1111 if (state && c->state != state)
1da177e4
LT		 1112 continue;
1113
23691d75 1114 if (c->psm == psm) {
1da177e4 1115 /* Exact match. */
23691d75 1116 if (!bacmp(&bt_sk(sk)->src, src)) {
a7567b20 1117 read_unlock(&chan_list_lock);
23691d75
GP		 1118 return c;
1119 }
1da177e4
LT		 1120
1121 /* Closest match */
1122 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
23691d75 1123 c1 = c;
1da177e4
LT		 1124 }
1125 }
1da177e4 1126
23691d75 1127 read_unlock(&chan_list_lock);
e0f0cb56 1128
23691d75 1129 return c1;
1da177e4
LT		 1130}
1131
77a74c7e 1132int l2cap_chan_connect(struct l2cap_chan *chan)
1da177e4 1133{
5d41ce1d 1134 struct sock *sk = chan->sk;
1da177e4
LT		 1135 bdaddr_t *src = &bt_sk(sk)->src;
1136 bdaddr_t *dst = &bt_sk(sk)->dst;
1137 struct l2cap_conn *conn;
1138 struct hci_conn *hcon;
1139 struct hci_dev *hdev;
09ab6f4c 1140 __u8 auth_type;
44d0e48e 1141 int err;
1da177e4 1142
f29972de 1143 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
fe4128e0 1144 chan->psm);
1da177e4 1145
af05b30b
GP		 1146 hdev = hci_get_route(dst, src);
1147 if (!hdev)
1da177e4
LT		 1148 return -EHOSTUNREACH;
1149
1150 hci_dev_lock_bh(hdev);
1151
4343478f 1152 auth_type = l2cap_get_auth_type(chan);
09ab6f4c 1153
fe4128e0 1154 if (chan->dcid == L2CAP_CID_LE_DATA)
acd7d370 1155 hcon = hci_connect(hdev, LE_LINK, dst,
4343478f 1156 chan->sec_level, auth_type);
acd7d370
VT		 1157 else
1158 hcon = hci_connect(hdev, ACL_LINK, dst,
4343478f 1159 chan->sec_level, auth_type);
acd7d370 1160
30e76272
VT		 1161 if (IS_ERR(hcon)) {
1162 err = PTR_ERR(hcon);
1da177e4 1163 goto done;
30e76272 1164 }
1da177e4
LT		 1165
1166 conn = l2cap_conn_add(hcon, 0);
1167 if (!conn) {
1168 hci_conn_put(hcon);
30e76272 1169 err = -ENOMEM;
1da177e4
LT		 1170 goto done;
1171 }
1172
1da177e4
LT		 1173 /* Update source addr of the socket */
1174 bacpy(src, conn->src);
1175
48454079
GP		 1176 l2cap_chan_add(conn, chan);
1177
89bc500e 1178 l2cap_state_change(chan, BT_CONNECT);
c9b66675 1179 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4
LT		 1180
1181 if (hcon->state == BT_CONNECTED) {
715ec005 1182 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
c9b66675 1183 __clear_chan_timer(chan);
4343478f 1184 if (l2cap_check_security(chan))
89bc500e 1185 l2cap_state_change(chan, BT_CONNECTED);
79d554a6 1186 } else
fc7f8a7e 1187 l2cap_do_start(chan);
1da177e4
LT		 1188 }
1189
30e76272
VT		 1190 err = 0;
1191
1da177e4
LT		 1192done:
1193 hci_dev_unlock_bh(hdev);
1194 hci_dev_put(hdev);
1195 return err;
1196}
1197
dcba0dba 1198int __l2cap_wait_ack(struct sock *sk)
6161c038 1199{
8c1d787b 1200 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
6161c038
GP		 1201 DECLARE_WAITQUEUE(wait, current);
1202 int err = 0;
1203 int timeo = HZ/5;
1204
2b0b05dd 1205 add_wait_queue(sk_sleep(sk), &wait);
a71a0cf4
PH		 1206 set_current_state(TASK_INTERRUPTIBLE);
1207 while (chan->unacked_frames > 0 && chan->conn) {
6161c038
GP		 1208 if (!timeo)
1209 timeo = HZ/5;
1210
1211 if (signal_pending(current)) {
1212 err = sock_intr_errno(timeo);
1213 break;
1214 }
1215
1216 release_sock(sk);
1217 timeo = schedule_timeout(timeo);
1218 lock_sock(sk);
a71a0cf4 1219 set_current_state(TASK_INTERRUPTIBLE);
6161c038
GP		 1220
1221 err = sock_error(sk);
1222 if (err)
1223 break;
1224 }
1225 set_current_state(TASK_RUNNING);
2b0b05dd 1226 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1227 return err;
1228}
1229
e90bac06
GP		 1230static void l2cap_monitor_timeout(unsigned long arg)
1231{
525cd185
GP		 1232 struct l2cap_chan *chan = (void *) arg;
1233 struct sock *sk = chan->sk;
e90bac06 1234
525cd185 1235 BT_DBG("chan %p", chan);
0e98958d 1236
e686219a 1237 bh_lock_sock(sk);
2c03a7a4 1238 if (chan->retry_count >= chan->remote_max_tx) {
8c1d787b 1239 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
b13f5860 1240 bh_unlock_sock(sk);
e90bac06
GP		 1241 return;
1242 }
1243
6a026610 1244 chan->retry_count++;
1a09bcb9 1245 __set_monitor_timer(chan);
e90bac06 1246
525cd185 1247 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
e686219a 1248 bh_unlock_sock(sk);
e90bac06
GP		 1249}
1250
1251static void l2cap_retrans_timeout(unsigned long arg)
1252{
525cd185
GP		 1253 struct l2cap_chan *chan = (void *) arg;
1254 struct sock *sk = chan->sk;
e90bac06 1255
49208c9c 1256 BT_DBG("chan %p", chan);
0e98958d 1257
e686219a 1258 bh_lock_sock(sk);
6a026610 1259 chan->retry_count = 1;
1a09bcb9 1260 __set_monitor_timer(chan);
e90bac06 1261
e2ab4353 1262 set_bit(CONN_WAIT_F, &chan->conn_state);
e90bac06 1263
525cd185 1264 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
e686219a 1265 bh_unlock_sock(sk);
e90bac06
GP		 1266}
1267
42e5c802 1268static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
1da177e4 1269{
1c2acffb 1270 struct sk_buff *skb;
1da177e4 1271
58d35f87 1272 while ((skb = skb_peek(&chan->tx_q)) &&
6a026610 1273 chan->unacked_frames) {
42e5c802 1274 if (bt_cb(skb)->tx_seq == chan->expected_ack_seq)
1c2acffb 1275 break;
1da177e4 1276
58d35f87 1277 skb = skb_dequeue(&chan->tx_q);
1c2acffb 1278 kfree_skb(skb);
1da177e4 1279
6a026610 1280 chan->unacked_frames--;
1c2acffb 1281 }
1da177e4 1282
6a026610 1283 if (!chan->unacked_frames)
1a09bcb9 1284 __clear_retrans_timer(chan);
1c2acffb 1285}
1da177e4 1286
67c9e840 1287static void l2cap_streaming_send(struct l2cap_chan *chan)
6840ed07 1288{
ccbb84af 1289 struct sk_buff *skb;
88843ab0
AE		 1290 u32 control;
1291 u16 fcs;
6840ed07 1292
58d35f87 1293 while ((skb = skb_dequeue(&chan->tx_q))) {
88843ab0 1294 control = __get_control(chan, skb->data + L2CAP_HDR_SIZE);
fb45de7d 1295 control |= __set_txseq(chan, chan->next_tx_seq);
88843ab0 1296 __put_control(chan, control, skb->data + L2CAP_HDR_SIZE);
6840ed07 1297
47d1ec61 1298 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1299 fcs = crc16(0, (u8 *)skb->data,
1300 skb->len - L2CAP_FCS_SIZE);
1301 put_unaligned_le16(fcs,
1302 skb->data + skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 1303 }
1304
4343478f 1305 l2cap_do_send(chan, skb);
6840ed07 1306
836be934 1307 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
6840ed07 1308 }
6840ed07
GP		 1309}
1310
fb45de7d 1311static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 1312{
8f17154f 1313 struct sk_buff *skb, *tx_skb;
88843ab0
AE		 1314 u16 fcs;
1315 u32 control;
8f17154f 1316
58d35f87 1317 skb = skb_peek(&chan->tx_q);
f11d676d
GP		 1318 if (!skb)
1319 return;
8f17154f 1320
f11d676d
GP		 1321 do {
1322 if (bt_cb(skb)->tx_seq == tx_seq)
8f17154f 1323 break;
8f17154f 1324
58d35f87 1325 if (skb_queue_is_last(&chan->tx_q, skb))
f11d676d 1326 return;
8f17154f 1327
58d35f87 1328 } while ((skb = skb_queue_next(&chan->tx_q, skb)));
8f17154f 1329
2c03a7a4
GP		 1330 if (chan->remote_max_tx &&
1331 bt_cb(skb)->retries == chan->remote_max_tx) {
8c1d787b 1332 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
f11d676d
GP		 1333 return;
1334 }
1335
1336 tx_skb = skb_clone(skb, GFP_ATOMIC);
1337 bt_cb(skb)->retries++;
88843ab0
AE		 1338
1339 control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
7e0ef6ee 1340 control &= __get_sar_mask(chan);
3cb123d1 1341
e2ab4353 1342 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
03f6715d 1343 control |= __set_ctrl_final(chan);
95ffa978 1344
0b209fae 1345 control |= __set_reqseq(chan, chan->buffer_seq);
fb45de7d 1346 control |= __set_txseq(chan, tx_seq);
3cb123d1 1347
88843ab0 1348 __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
f11d676d 1349
47d1ec61 1350 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1351 fcs = crc16(0, (u8 *)tx_skb->data,
1352 tx_skb->len - L2CAP_FCS_SIZE);
1353 put_unaligned_le16(fcs,
1354 tx_skb->data + tx_skb->len - L2CAP_FCS_SIZE);
f11d676d
GP		 1355 }
1356
4343478f 1357 l2cap_do_send(chan, tx_skb);
8f17154f
GP		 1358}
1359
67c9e840 1360static int l2cap_ertm_send(struct l2cap_chan *chan)
1c2acffb
GP		 1361{
1362 struct sk_buff *skb, *tx_skb;
88843ab0
AE		 1363 u16 fcs;
1364 u32 control;
9a9c6a34 1365 int nsent = 0;
1c2acffb 1366
89bc500e 1367 if (chan->state != BT_CONNECTED)
c13ffa62 1368 return -ENOTCONN;
e90bac06 1369
58d35f87 1370 while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
1c2acffb 1371
2c03a7a4
GP		 1372 if (chan->remote_max_tx &&
1373 bt_cb(skb)->retries == chan->remote_max_tx) {
8c1d787b 1374 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
e90bac06
GP		 1375 break;
1376 }
1377
e420aba3
AE		 1378 tx_skb = skb_clone(skb, GFP_ATOMIC);
1379
e90bac06
GP		 1380 bt_cb(skb)->retries++;
1381
88843ab0 1382 control = __get_control(chan, tx_skb->data + L2CAP_HDR_SIZE);
7e0ef6ee 1383 control &= __get_sar_mask(chan);
95ffa978 1384
e2ab4353 1385 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
03f6715d 1386 control |= __set_ctrl_final(chan);
e2ab4353 1387
0b209fae 1388 control |= __set_reqseq(chan, chan->buffer_seq);
fb45de7d 1389 control |= __set_txseq(chan, chan->next_tx_seq);
1c2acffb 1390
88843ab0 1391 __put_control(chan, control, tx_skb->data + L2CAP_HDR_SIZE);
e90bac06 1392
47d1ec61 1393 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213
AE		 1394 fcs = crc16(0, (u8 *)skb->data,
1395 tx_skb->len - L2CAP_FCS_SIZE);
1396 put_unaligned_le16(fcs, skb->data +
1397 tx_skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 1398 }
1399
4343478f 1400 l2cap_do_send(chan, tx_skb);
9a9c6a34 1401
1a09bcb9 1402 __set_retrans_timer(chan);
1c2acffb 1403
42e5c802 1404 bt_cb(skb)->tx_seq = chan->next_tx_seq;
836be934
AE		 1405
1406 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1c2acffb 1407
23e9fde2 1408 if (bt_cb(skb)->retries == 1)
6a026610 1409 chan->unacked_frames++;
23e9fde2 1410
6a026610 1411 chan->frames_sent++;
1c2acffb 1412
58d35f87
GP		 1413 if (skb_queue_is_last(&chan->tx_q, skb))
1414 chan->tx_send_head = NULL;
1c2acffb 1415 else
58d35f87 1416 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
9e917af1
GP		 1417
1418 nsent++;
1c2acffb
GP		 1419 }
1420
9e917af1
GP		 1421 return nsent;
1422}
1423
525cd185 1424static int l2cap_retransmit_frames(struct l2cap_chan *chan)
dfc909be 1425{
dfc909be
GP		 1426 int ret;
1427
58d35f87
GP		 1428 if (!skb_queue_empty(&chan->tx_q))
1429 chan->tx_send_head = chan->tx_q.next;
dfc909be 1430
42e5c802 1431 chan->next_tx_seq = chan->expected_ack_seq;
525cd185 1432 ret = l2cap_ertm_send(chan);
dfc909be
GP		 1433 return ret;
1434}
1435
525cd185 1436static void l2cap_send_ack(struct l2cap_chan *chan)
9e917af1 1437{
88843ab0 1438 u32 control = 0;
9e917af1 1439
0b209fae 1440 control |= __set_reqseq(chan, chan->buffer_seq);
9e917af1 1441
e2ab4353 1442 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 1443 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
e2ab4353 1444 set_bit(CONN_RNR_SENT, &chan->conn_state);
525cd185 1445 l2cap_send_sframe(chan, control);
9a9c6a34 1446 return;
9e917af1 1447 }
dfc909be 1448
525cd185 1449 if (l2cap_ertm_send(chan) > 0)
dfc909be
GP		 1450 return;
1451
ab784b73 1452 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 1453 l2cap_send_sframe(chan, control);
1c2acffb
GP		 1454}
1455
525cd185 1456static void l2cap_send_srejtail(struct l2cap_chan *chan)
99b0d4b7
GP		 1457{
1458 struct srej_list *tail;
88843ab0 1459 u32 control;
99b0d4b7 1460
ab784b73 1461 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
03f6715d 1462 control |= __set_ctrl_final(chan);
99b0d4b7 1463
39d5a3ee 1464 tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
0b209fae 1465 control |= __set_reqseq(chan, tail->tx_seq);
99b0d4b7 1466
525cd185 1467 l2cap_send_sframe(chan, control);
99b0d4b7
GP		 1468}
1469
1c2acffb
GP		 1470static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1471{
8c1d787b 1472 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
1c2acffb
GP		 1473 struct sk_buff **frag;
1474 int err, sent = 0;
1da177e4 1475
59203a21 1476 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1477 return -EFAULT;
1da177e4
LT		 1478
1479 sent += count;
1480 len -= count;
1481
1482 /* Continuation fragments (no L2CAP header) */
1483 frag = &skb_shinfo(skb)->frag_list;
1484 while (len) {
1485 count = min_t(unsigned int, conn->mtu, len);
1486
1487 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1488 if (!*frag)
0175d629 1489 return err;
1c2acffb
GP		 1490 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1491 return -EFAULT;
1da177e4 1492
5e59b791
LAD		 1493 (*frag)->priority = skb->priority;
1494
1da177e4
LT		 1495 sent += count;
1496 len -= count;
1497
1498 frag = &(*frag)->next;
1499 }
1da177e4
LT		 1500
1501 return sent;
1c2acffb 1502}
1da177e4 1503
5e59b791
LAD		 1504static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
1505 struct msghdr *msg, size_t len,
1506 u32 priority)
1c2acffb 1507{
fe4128e0 1508 struct sock *sk = chan->sk;
8c1d787b 1509 struct l2cap_conn *conn = chan->conn;
1c2acffb 1510 struct sk_buff *skb;
03a51213 1511 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
1c2acffb
GP		 1512 struct l2cap_hdr *lh;
1513
5e59b791 1514 BT_DBG("sk %p len %d priority %u", sk, (int)len, priority);
1c2acffb
GP		 1515
1516 count = min_t(unsigned int, (conn->mtu - hlen), len);
1517 skb = bt_skb_send_alloc(sk, count + hlen,
1518 msg->msg_flags & MSG_DONTWAIT, &err);
1519 if (!skb)
0175d629 1520 return ERR_PTR(err);
1c2acffb 1521
5e59b791
LAD		 1522 skb->priority = priority;
1523
1c2acffb
GP		 1524 /* Create L2CAP header */
1525 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1526 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb 1527 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
fe4128e0 1528 put_unaligned_le16(chan->psm, skb_put(skb, 2));
1c2acffb
GP		 1529
1530 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1531 if (unlikely(err < 0)) {
1532 kfree_skb(skb);
1533 return ERR_PTR(err);
1534 }
1535 return skb;
1536}
1537
5e59b791
LAD		 1538static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
1539 struct msghdr *msg, size_t len,
1540 u32 priority)
1c2acffb 1541{
fe4128e0 1542 struct sock *sk = chan->sk;
8c1d787b 1543 struct l2cap_conn *conn = chan->conn;
1c2acffb
GP		 1544 struct sk_buff *skb;
1545 int err, count, hlen = L2CAP_HDR_SIZE;
1546 struct l2cap_hdr *lh;
1547
1548 BT_DBG("sk %p len %d", sk, (int)len);
1549
1550 count = min_t(unsigned int, (conn->mtu - hlen), len);
1551 skb = bt_skb_send_alloc(sk, count + hlen,
1552 msg->msg_flags & MSG_DONTWAIT, &err);
1553 if (!skb)
0175d629 1554 return ERR_PTR(err);
1c2acffb 1555
5e59b791
LAD		 1556 skb->priority = priority;
1557
1c2acffb
GP		 1558 /* Create L2CAP header */
1559 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fe4128e0 1560 lh->cid = cpu_to_le16(chan->dcid);
1c2acffb
GP		 1561 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1562
1563 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1564 if (unlikely(err < 0)) {
1565 kfree_skb(skb);
1566 return ERR_PTR(err);
1567 }
1568 return skb;
1569}
1570
ab0ff76d
LAD		 1571static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
1572 struct msghdr *msg, size_t len,
88843ab0 1573 u32 control, u16 sdulen)
1c2acffb 1574{
47d1ec61 1575 struct sock *sk = chan->sk;
8c1d787b 1576 struct l2cap_conn *conn = chan->conn;
1c2acffb 1577 struct sk_buff *skb;
e4ca6d98 1578 int err, count, hlen;
1c2acffb
GP		 1579 struct l2cap_hdr *lh;
1580
1581 BT_DBG("sk %p len %d", sk, (int)len);
1582
0ee0d208
GP		 1583 if (!conn)
1584 return ERR_PTR(-ENOTCONN);
1585
e4ca6d98
AE		 1586 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1587 hlen = L2CAP_EXT_HDR_SIZE;
1588 else
1589 hlen = L2CAP_ENH_HDR_SIZE;
1590
c74e560c 1591 if (sdulen)
03a51213 1592 hlen += L2CAP_SDULEN_SIZE;
c74e560c 1593
47d1ec61 1594 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 1595 hlen += L2CAP_FCS_SIZE;
fcc203c3 1596
1c2acffb
GP		 1597 count = min_t(unsigned int, (conn->mtu - hlen), len);
1598 skb = bt_skb_send_alloc(sk, count + hlen,
1599 msg->msg_flags & MSG_DONTWAIT, &err);
1600 if (!skb)
0175d629 1601 return ERR_PTR(err);
1c2acffb
GP		 1602
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 1606 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
88843ab0
AE		 1607
1608 __put_control(chan, control, skb_put(skb, __ctrl_size(chan)));
1609
c74e560c 1610 if (sdulen)
03a51213 1611 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
1c2acffb
GP		 1612
1613 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1614 if (unlikely(err < 0)) {
1615 kfree_skb(skb);
1616 return ERR_PTR(err);
1617 }
e90bac06 1618
47d1ec61 1619 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 1620 put_unaligned_le16(0, skb_put(skb, L2CAP_FCS_SIZE));
fcc203c3 1621
e90bac06 1622 bt_cb(skb)->retries = 0;
1c2acffb 1623 return skb;
1da177e4
LT		 1624}
1625
67c9e840 1626static int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
c74e560c 1627{
c74e560c
GP		 1628 struct sk_buff *skb;
1629 struct sk_buff_head sar_queue;
88843ab0 1630 u32 control;
c74e560c
GP		 1631 size_t size = 0;
1632
ff12fd64 1633 skb_queue_head_init(&sar_queue);
7e0ef6ee 1634 control = __set_ctrl_sar(chan, L2CAP_SAR_START);
47d1ec61 1635 skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len);
c74e560c
GP		 1636 if (IS_ERR(skb))
1637 return PTR_ERR(skb);
1638
1639 __skb_queue_tail(&sar_queue, skb);
2c03a7a4
GP		 1640 len -= chan->remote_mps;
1641 size += chan->remote_mps;
c74e560c
GP		 1642
1643 while (len > 0) {
1644 size_t buflen;
1645
2c03a7a4 1646 if (len > chan->remote_mps) {
7e0ef6ee 1647 control = __set_ctrl_sar(chan, L2CAP_SAR_CONTINUE);
2c03a7a4 1648 buflen = chan->remote_mps;
c74e560c 1649 } else {
7e0ef6ee 1650 control = __set_ctrl_sar(chan, L2CAP_SAR_END);
c74e560c
GP		 1651 buflen = len;
1652 }
1653
47d1ec61 1654 skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0);
c74e560c
GP		 1655 if (IS_ERR(skb)) {
1656 skb_queue_purge(&sar_queue);
1657 return PTR_ERR(skb);
1658 }
1659
1660 __skb_queue_tail(&sar_queue, skb);
1661 len -= buflen;
1662 size += buflen;
c74e560c 1663 }
58d35f87
GP		 1664 skb_queue_splice_tail(&sar_queue, &chan->tx_q);
1665 if (chan->tx_send_head == NULL)
1666 chan->tx_send_head = sar_queue.next;
c74e560c
GP		 1667
1668 return size;
1669}
1670
5e59b791
LAD		 1671int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
1672 u32 priority)
9a91a04a 1673{
9a91a04a 1674 struct sk_buff *skb;
88843ab0 1675 u32 control;
9a91a04a
GP		 1676 int err;
1677
1678 /* Connectionless channel */
715ec005 1679 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
5e59b791 1680 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
9a91a04a
GP		 1681 if (IS_ERR(skb))
1682 return PTR_ERR(skb);
1683
1684 l2cap_do_send(chan, skb);
1685 return len;
1686 }
1687
1688 switch (chan->mode) {
1689 case L2CAP_MODE_BASIC:
1690 /* Check outgoing MTU */
1691 if (len > chan->omtu)
1692 return -EMSGSIZE;
1693
1694 /* Create a basic PDU */
5e59b791 1695 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
9a91a04a
GP		 1696 if (IS_ERR(skb))
1697 return PTR_ERR(skb);
1698
1699 l2cap_do_send(chan, skb);
1700 err = len;
1701 break;
1702
1703 case L2CAP_MODE_ERTM:
1704 case L2CAP_MODE_STREAMING:
1705 /* Entire SDU fits into one PDU */
1706 if (len <= chan->remote_mps) {
7e0ef6ee 1707 control = __set_ctrl_sar(chan, L2CAP_SAR_UNSEGMENTED);
9a91a04a
GP		 1708 skb = l2cap_create_iframe_pdu(chan, msg, len, control,
1709 0);
1710 if (IS_ERR(skb))
1711 return PTR_ERR(skb);
1712
1713 __skb_queue_tail(&chan->tx_q, skb);
1714
1715 if (chan->tx_send_head == NULL)
1716 chan->tx_send_head = skb;
1717
1718 } else {
1719 /* Segment SDU into multiples PDUs */
1720 err = l2cap_sar_segment_sdu(chan, msg, len);
1721 if (err < 0)
1722 return err;
1723 }
1724
1725 if (chan->mode == L2CAP_MODE_STREAMING) {
1726 l2cap_streaming_send(chan);
1727 err = len;
1728 break;
1729 }
1730
e2ab4353
GP		 1731 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
1732 test_bit(CONN_WAIT_F, &chan->conn_state)) {
9a91a04a
GP		 1733 err = len;
1734 break;
1735 }
1736
1737 err = l2cap_ertm_send(chan);
1738 if (err >= 0)
1739 err = len;
1740
1741 break;
1742
1743 default:
1744 BT_DBG("bad state %1.1x", chan->mode);
1745 err = -EBADFD;
1746 }
1747
1748 return err;
1749}
1750
1da177e4
LT		 1751/* Copy frame to all raw sockets on that connection */
1752static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
1753{
1da177e4 1754 struct sk_buff *nskb;
48454079 1755 struct l2cap_chan *chan;
1da177e4
LT		 1756
1757 BT_DBG("conn %p", conn);
1758
baa7e1fa
GP		 1759 read_lock(&conn->chan_lock);
1760 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 1761 struct sock *sk = chan->sk;
715ec005 1762 if (chan->chan_type != L2CAP_CHAN_RAW)
1da177e4
LT		 1763 continue;
1764
1765 /* Don't send frame to the socket it came from */
1766 if (skb->sk == sk)
1767 continue;
af05b30b
GP		 1768 nskb = skb_clone(skb, GFP_ATOMIC);
1769 if (!nskb)
1da177e4
LT		 1770 continue;
1771
23070494 1772 if (chan->ops->recv(chan->data, nskb))
1da177e4
LT		 1773 kfree_skb(nskb);
1774 }
baa7e1fa 1775 read_unlock(&conn->chan_lock);
1da177e4
LT		 1776}
1777
1778/* ---- L2CAP signalling commands ---- */
1779static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
1780 u8 code, u8 ident, u16 dlen, void *data)
1781{
1782 struct sk_buff *skb, **frag;
1783 struct l2cap_cmd_hdr *cmd;
1784 struct l2cap_hdr *lh;
1785 int len, count;
1786
af05b30b
GP		 1787 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
1788 conn, code, ident, dlen);
1da177e4
LT		 1789
1790 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
1791 count = min_t(unsigned int, conn->mtu, len);
1792
1793 skb = bt_skb_alloc(count, GFP_ATOMIC);
1794 if (!skb)
1795 return NULL;
1796
1797 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 1798 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
3300d9a9
CT		 1799
1800 if (conn->hcon->type == LE_LINK)
1801 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
1802 else
1803 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 1804
1805 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
1806 cmd->code = code;
1807 cmd->ident = ident;
aca3192c 1808 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 1809
1810 if (dlen) {
1811 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
1812 memcpy(skb_put(skb, count), data, count);
1813 data += count;
1814 }
1815
1816 len -= skb->len;
1817
1818 /* Continuation fragments (no L2CAP header) */
1819 frag = &skb_shinfo(skb)->frag_list;
1820 while (len) {
1821 count = min_t(unsigned int, conn->mtu, len);
1822
1823 *frag = bt_skb_alloc(count, GFP_ATOMIC);
1824 if (!*frag)
1825 goto fail;
1826
1827 memcpy(skb_put(*frag, count), data, count);
1828
1829 len -= count;
1830 data += count;
1831
1832 frag = &(*frag)->next;
1833 }
1834
1835 return skb;
1836
1837fail:
1838 kfree_skb(skb);
1839 return NULL;
1840}
1841
1842static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
1843{
1844 struct l2cap_conf_opt *opt = *ptr;
1845 int len;
1846
1847 len = L2CAP_CONF_OPT_SIZE + opt->len;
1848 *ptr += len;
1849
1850 *type = opt->type;
1851 *olen = opt->len;
1852
1853 switch (opt->len) {
1854 case 1:
1855 *val = *((u8 *) opt->val);
1856 break;
1857
1858 case 2:
bfaaeb3e 1859 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 1860 break;
1861
1862 case 4:
bfaaeb3e 1863 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 1864 break;
1865
1866 default:
1867 *val = (unsigned long) opt->val;
1868 break;
1869 }
1870
1871 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
1872 return len;
1873}
1874
1da177e4
LT		 1875static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
1876{
1877 struct l2cap_conf_opt *opt = *ptr;
1878
1879 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
1880
1881 opt->type = type;
1882 opt->len = len;
1883
1884 switch (len) {
1885 case 1:
1886 *((u8 *) opt->val) = val;
1887 break;
1888
1889 case 2:
4f8b691c 1890 put_unaligned_le16(val, opt->val);
1da177e4
LT		 1891 break;
1892
1893 case 4:
4f8b691c 1894 put_unaligned_le32(val, opt->val);
1da177e4
LT		 1895 break;
1896
1897 default:
1898 memcpy(opt->val, (void *) val, len);
1899 break;
1900 }
1901
1902 *ptr += L2CAP_CONF_OPT_SIZE + len;
1903}
1904
f89cef09
AE		 1905static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
1906{
1907 struct l2cap_conf_efs efs;
1908
1909 switch(chan->mode) {
1910 case L2CAP_MODE_ERTM:
1911 efs.id = chan->local_id;
1912 efs.stype = chan->local_stype;
1913 efs.msdu = cpu_to_le16(chan->local_msdu);
1914 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
1915 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
1916 efs.flush_to = cpu_to_le32(L2CAP_DEFAULT_FLUSH_TO);
1917 break;
1918
1919 case L2CAP_MODE_STREAMING:
1920 efs.id = 1;
1921 efs.stype = L2CAP_SERV_BESTEFFORT;
1922 efs.msdu = cpu_to_le16(chan->local_msdu);
1923 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
1924 efs.acc_lat = 0;
1925 efs.flush_to = 0;
1926 break;
1927
1928 default:
1929 return;
1930 }
1931
1932 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
1933 (unsigned long) &efs);
1934}
1935
c1b4f43b
GP		 1936static void l2cap_ack_timeout(unsigned long arg)
1937{
525cd185 1938 struct l2cap_chan *chan = (void *) arg;
c1b4f43b 1939
525cd185
GP		 1940 bh_lock_sock(chan->sk);
1941 l2cap_send_ack(chan);
1942 bh_unlock_sock(chan->sk);
c1b4f43b
GP		 1943}
1944
525cd185 1945static inline void l2cap_ertm_init(struct l2cap_chan *chan)
0565c1c2 1946{
525cd185
GP		 1947 struct sock *sk = chan->sk;
1948
42e5c802 1949 chan->expected_ack_seq = 0;
6a026610 1950 chan->unacked_frames = 0;
42e5c802 1951 chan->buffer_seq = 0;
6a026610
GP		 1952 chan->num_acked = 0;
1953 chan->frames_sent = 0;
0565c1c2 1954
e92c8e70
GP		 1955 setup_timer(&chan->retrans_timer, l2cap_retrans_timeout,
1956 (unsigned long) chan);
1957 setup_timer(&chan->monitor_timer, l2cap_monitor_timeout,
1958 (unsigned long) chan);
1959 setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan);
0565c1c2 1960
f1c6775b 1961 skb_queue_head_init(&chan->srej_q);
1890d36b 1962
39d5a3ee
GP		 1963 INIT_LIST_HEAD(&chan->srej_l);
1964
218bb9df
GP		 1965
1966 sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
0565c1c2
GP		 1967}
1968
f2fcfcd6
GP		 1969static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
1970{
1971 switch (mode) {
1972 case L2CAP_MODE_STREAMING:
1973 case L2CAP_MODE_ERTM:
1974 if (l2cap_mode_supported(mode, remote_feat_mask))
1975 return mode;
1976 /* fall through */
1977 default:
1978 return L2CAP_MODE_BASIC;
1979 }
1980}
1981
6327eb98
AE		 1982static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
1983{
1984 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
1985}
1986
f89cef09
AE		 1987static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
1988{
1989 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
1990}
1991
6327eb98
AE		 1992static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
1993{
1994 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
836be934 1995 __l2cap_ews_supported(chan)) {
6327eb98
AE		 1996 /* use extended control field */
1997 set_bit(FLAG_EXT_CTRL, &chan->flags);
836be934
AE		 1998 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
1999 } else {
6327eb98
AE		 2000 chan->tx_win = min_t(u16, chan->tx_win,
2001 L2CAP_DEFAULT_TX_WINDOW);
836be934
AE		 2002 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
2003 }
6327eb98
AE		 2004}
2005
710f9b0a 2006static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2007{
1da177e4 2008 struct l2cap_conf_req *req = data;
0c1bc5c6 2009 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1da177e4 2010 void *ptr = req->data;
c8f79162 2011 u16 size;
1da177e4 2012
49208c9c 2013 BT_DBG("chan %p", chan);
1da177e4 2014
73ffa904 2015 if (chan->num_conf_req || chan->num_conf_rsp)
f2fcfcd6
GP		 2016 goto done;
2017
0c1bc5c6 2018 switch (chan->mode) {
f2fcfcd6
GP		 2019 case L2CAP_MODE_STREAMING:
2020 case L2CAP_MODE_ERTM:
c1360a1c 2021 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
85eb53c6 2022 break;
85eb53c6 2023
f89cef09
AE		 2024 if (__l2cap_efs_supported(chan))
2025 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2026
2ba13ed6 2027 /* fall through */
f2fcfcd6 2028 default:
8c1d787b 2029 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
f2fcfcd6
GP		 2030 break;
2031 }
2032
2033done:
0c1bc5c6
GP		 2034 if (chan->imtu != L2CAP_DEFAULT_MTU)
2035 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
7990681c 2036
0c1bc5c6 2037 switch (chan->mode) {
65c7c491 2038 case L2CAP_MODE_BASIC:
8c1d787b
GP		 2039 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2040 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
63406504
GP		 2041 break;
2042
62547752
GP		 2043 rfc.mode = L2CAP_MODE_BASIC;
2044 rfc.txwin_size = 0;
2045 rfc.max_transmit = 0;
2046 rfc.retrans_timeout = 0;
2047 rfc.monitor_timeout = 0;
2048 rfc.max_pdu_size = 0;
2049
63406504
GP		 2050 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2051 (unsigned long) &rfc);
65c7c491
MH		 2052 break;
2053
2054 case L2CAP_MODE_ERTM:
2055 rfc.mode = L2CAP_MODE_ERTM;
47d1ec61 2056 rfc.max_transmit = chan->max_tx;
f2fcfcd6
GP		 2057 rfc.retrans_timeout = 0;
2058 rfc.monitor_timeout = 0;
c8f79162
AE		 2059
2060 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2061 L2CAP_EXT_HDR_SIZE -
2062 L2CAP_SDULEN_SIZE -
2063 L2CAP_FCS_SIZE);
2064 rfc.max_pdu_size = cpu_to_le16(size);
f2fcfcd6 2065
6327eb98
AE		 2066 l2cap_txwin_setup(chan);
2067
2068 rfc.txwin_size = min_t(u16, chan->tx_win,
2069 L2CAP_DEFAULT_TX_WINDOW);
2070
63406504
GP		 2071 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2072 (unsigned long) &rfc);
2073
f89cef09
AE		 2074 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2075 l2cap_add_opt_efs(&ptr, chan);
2076
8c1d787b 2077 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2078 break;
2079
47d1ec61 2080 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2081 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2082 chan->fcs = L2CAP_FCS_NONE;
2083 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2084 }
6327eb98
AE		 2085
2086 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2087 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2088 chan->tx_win);
f2fcfcd6
GP		 2089 break;
2090
2091 case L2CAP_MODE_STREAMING:
2092 rfc.mode = L2CAP_MODE_STREAMING;
2093 rfc.txwin_size = 0;
2094 rfc.max_transmit = 0;
2095 rfc.retrans_timeout = 0;
2096 rfc.monitor_timeout = 0;
c8f79162
AE		 2097
2098 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
2099 L2CAP_EXT_HDR_SIZE -
2100 L2CAP_SDULEN_SIZE -
2101 L2CAP_FCS_SIZE);
2102 rfc.max_pdu_size = cpu_to_le16(size);
65c7c491 2103
63406504
GP		 2104 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2105 (unsigned long) &rfc);
2106
f89cef09
AE		 2107 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
2108 l2cap_add_opt_efs(&ptr, chan);
2109
8c1d787b 2110 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
fcc203c3
GP		 2111 break;
2112
47d1ec61 2113 if (chan->fcs == L2CAP_FCS_NONE ||
c1360a1c 2114 test_bit(CONF_NO_FCS_RECV, &chan->conf_state)) {
47d1ec61
GP		 2115 chan->fcs = L2CAP_FCS_NONE;
2116 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
fcc203c3 2117 }
65c7c491
MH		 2118 break;
2119 }
1da177e4 2120
fe4128e0 2121 req->dcid = cpu_to_le16(chan->dcid);
aca3192c 2122 req->flags = cpu_to_le16(0);
1da177e4
LT		 2123
2124 return ptr - data;
2125}
2126
73ffa904 2127static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1da177e4 2128{
5dee9e7c
MH		 2129 struct l2cap_conf_rsp *rsp = data;
2130 void *ptr = rsp->data;
73ffa904
GP		 2131 void *req = chan->conf_req;
2132 int len = chan->conf_len;
5dee9e7c
MH		 2133 int type, hint, olen;
2134 unsigned long val;
6464f35f 2135 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
42dceae2
AE		 2136 struct l2cap_conf_efs efs;
2137 u8 remote_efs = 0;
861d6882 2138 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2139 u16 result = L2CAP_CONF_SUCCESS;
c8f79162 2140 u16 size;
1da177e4 2141
73ffa904 2142 BT_DBG("chan %p", chan);
820ae1b8 2143
5dee9e7c
MH		 2144 while (len >= L2CAP_CONF_OPT_SIZE) {
2145 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2146
589d2746 2147 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2148 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2149
2150 switch (type) {
2151 case L2CAP_CONF_MTU:
861d6882 2152 mtu = val;
5dee9e7c
MH		 2153 break;
2154
2155 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2156 chan->flush_to = val;
5dee9e7c
MH		 2157 break;
2158
2159 case L2CAP_CONF_QOS:
2160 break;
2161
6464f35f
MH		 2162 case L2CAP_CONF_RFC:
2163 if (olen == sizeof(rfc))
2164 memcpy(&rfc, (void *) val, olen);
2165 break;
2166
fcc203c3
GP		 2167 case L2CAP_CONF_FCS:
2168 if (val == L2CAP_FCS_NONE)
c1360a1c 2169 set_bit(CONF_NO_FCS_RECV, &chan->conf_state);
42dceae2 2170 break;
fcc203c3 2171
42dceae2
AE		 2172 case L2CAP_CONF_EFS:
2173 remote_efs = 1;
2174 if (olen == sizeof(efs))
2175 memcpy(&efs, (void *) val, olen);
fcc203c3
GP		 2176 break;
2177
6327eb98
AE		 2178 case L2CAP_CONF_EWS:
2179 if (!enable_hs)
2180 return -ECONNREFUSED;
2181
2182 set_bit(FLAG_EXT_CTRL, &chan->flags);
2183 set_bit(CONF_EWS_RECV, &chan->conf_state);
836be934 2184 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
6327eb98
AE		 2185 chan->remote_tx_win = val;
2186 break;
2187
5dee9e7c
MH		 2188 default:
2189 if (hint)
2190 break;
2191
2192 result = L2CAP_CONF_UNKNOWN;
2193 *((u8 *) ptr++) = type;
2194 break;
2195 }
2196 }
2197
73ffa904 2198 if (chan->num_conf_rsp || chan->num_conf_req > 1)
f2fcfcd6
GP		 2199 goto done;
2200
0c1bc5c6 2201 switch (chan->mode) {
f2fcfcd6
GP		 2202 case L2CAP_MODE_STREAMING:
2203 case L2CAP_MODE_ERTM:
c1360a1c 2204 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
0c1bc5c6 2205 chan->mode = l2cap_select_mode(rfc.mode,
8c1d787b 2206 chan->conn->feat_mask);
85eb53c6
GP		 2207 break;
2208 }
2209
42dceae2
AE		 2210 if (remote_efs) {
2211 if (__l2cap_efs_supported(chan))
2212 set_bit(FLAG_EFS_ENABLE, &chan->flags);
2213 else
2214 return -ECONNREFUSED;
2215 }
2216
0c1bc5c6 2217 if (chan->mode != rfc.mode)
f2fcfcd6 2218 return -ECONNREFUSED;
742e519b 2219
f2fcfcd6 2220 break;
f2fcfcd6
GP		 2221 }
2222
2223done:
0c1bc5c6 2224 if (chan->mode != rfc.mode) {
f2fcfcd6 2225 result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2226 rfc.mode = chan->mode;
f2fcfcd6 2227
73ffa904 2228 if (chan->num_conf_rsp == 1)
f2fcfcd6
GP		 2229 return -ECONNREFUSED;
2230
2231 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2232 sizeof(rfc), (unsigned long) &rfc);
2233 }
2234
5dee9e7c
MH		 2235 if (result == L2CAP_CONF_SUCCESS) {
2236 /* Configure output options and let the other side know
2237 * which ones we don't like. */
2238
f2fcfcd6
GP		 2239 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2240 result = L2CAP_CONF_UNACCEPT;
2241 else {
0c1bc5c6 2242 chan->omtu = mtu;
c1360a1c 2243 set_bit(CONF_MTU_DONE, &chan->conf_state);
f2fcfcd6 2244 }
0c1bc5c6 2245 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
6464f35f 2246
42dceae2
AE		 2247 if (remote_efs) {
2248 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
2249 efs.stype != L2CAP_SERV_NOTRAFIC &&
2250 efs.stype != chan->local_stype) {
2251
2252 result = L2CAP_CONF_UNACCEPT;
2253
2254 if (chan->num_conf_req >= 1)
2255 return -ECONNREFUSED;
2256
2257 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3e6b3b95 2258 sizeof(efs),
42dceae2 2259 (unsigned long) &efs);
0e8b207e 2260 } else {
3e6b3b95 2261 /* Send PENDING Conf Rsp */
0e8b207e
AE		 2262 result = L2CAP_CONF_PENDING;
2263 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
42dceae2
AE		 2264 }
2265 }
2266
f2fcfcd6
GP		 2267 switch (rfc.mode) {
2268 case L2CAP_MODE_BASIC:
47d1ec61 2269 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 2270 set_bit(CONF_MODE_DONE, &chan->conf_state);
f2fcfcd6
GP		 2271 break;
2272
2273 case L2CAP_MODE_ERTM:
6327eb98
AE		 2274 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
2275 chan->remote_tx_win = rfc.txwin_size;
2276 else
2277 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
2278
2c03a7a4 2279 chan->remote_max_tx = rfc.max_transmit;
86b1b263 2280
c8f79162
AE		 2281 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2282 chan->conn->mtu -
2283 L2CAP_EXT_HDR_SIZE -
2284 L2CAP_SDULEN_SIZE -
2285 L2CAP_FCS_SIZE);
2286 rfc.max_pdu_size = cpu_to_le16(size);
2287 chan->remote_mps = size;
f2fcfcd6 2288
10467e9e
GP		 2289 rfc.retrans_timeout =
2290 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2291 rfc.monitor_timeout =
2292 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6 2293
c1360a1c 2294 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 2295
2296 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2297 sizeof(rfc), (unsigned long) &rfc);
2298
42dceae2
AE		 2299 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
2300 chan->remote_id = efs.id;
2301 chan->remote_stype = efs.stype;
2302 chan->remote_msdu = le16_to_cpu(efs.msdu);
2303 chan->remote_flush_to =
2304 le32_to_cpu(efs.flush_to);
2305 chan->remote_acc_lat =
2306 le32_to_cpu(efs.acc_lat);
2307 chan->remote_sdu_itime =
2308 le32_to_cpu(efs.sdu_itime);
2309 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
2310 sizeof(efs), (unsigned long) &efs);
2311 }
f2fcfcd6
GP		 2312 break;
2313
2314 case L2CAP_MODE_STREAMING:
c8f79162
AE		 2315 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
2316 chan->conn->mtu -
2317 L2CAP_EXT_HDR_SIZE -
2318 L2CAP_SDULEN_SIZE -
2319 L2CAP_FCS_SIZE);
2320 rfc.max_pdu_size = cpu_to_le16(size);
2321 chan->remote_mps = size;
f2fcfcd6 2322
c1360a1c 2323 set_bit(CONF_MODE_DONE, &chan->conf_state);
68ae6639
GP		 2324
2325 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2326 sizeof(rfc), (unsigned long) &rfc);
2327
f2fcfcd6
GP		 2328 break;
2329
2330 default:
5dee9e7c 2331 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2332
6464f35f 2333 memset(&rfc, 0, sizeof(rfc));
0c1bc5c6 2334 rfc.mode = chan->mode;
f2fcfcd6 2335 }
6464f35f 2336
f2fcfcd6 2337 if (result == L2CAP_CONF_SUCCESS)
c1360a1c 2338 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
f2fcfcd6 2339 }
fe4128e0 2340 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c
MH		 2341 rsp->result = cpu_to_le16(result);
2342 rsp->flags = cpu_to_le16(0x0000);
2343
2344 return ptr - data;
1da177e4
LT		 2345}
2346
b4450035 2347static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
f2fcfcd6 2348{
f2fcfcd6
GP		 2349 struct l2cap_conf_req *req = data;
2350 void *ptr = req->data;
2351 int type, olen;
2352 unsigned long val;
2353 struct l2cap_conf_rfc rfc;
2354
fe4128e0 2355 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
f2fcfcd6
GP		 2356
2357 while (len >= L2CAP_CONF_OPT_SIZE) {
2358 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2359
2360 switch (type) {
2361 case L2CAP_CONF_MTU:
2362 if (val < L2CAP_DEFAULT_MIN_MTU) {
2363 *result = L2CAP_CONF_UNACCEPT;
0c1bc5c6 2364 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 2365 } else
0c1bc5c6
GP		 2366 chan->imtu = val;
2367 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
f2fcfcd6
GP		 2368 break;
2369
2370 case L2CAP_CONF_FLUSH_TO:
0c1bc5c6 2371 chan->flush_to = val;
f2fcfcd6 2372 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
0c1bc5c6 2373 2, chan->flush_to);
f2fcfcd6
GP		 2374 break;
2375
2376 case L2CAP_CONF_RFC:
2377 if (olen == sizeof(rfc))
2378 memcpy(&rfc, (void *)val, olen);
2379
c1360a1c 2380 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
0c1bc5c6 2381 rfc.mode != chan->mode)
f2fcfcd6
GP		 2382 return -ECONNREFUSED;
2383
47d1ec61 2384 chan->fcs = 0;
f2fcfcd6
GP		 2385
2386 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2387 sizeof(rfc), (unsigned long) &rfc);
2388 break;
6327eb98
AE		 2389
2390 case L2CAP_CONF_EWS:
2391 chan->tx_win = min_t(u16, val,
2392 L2CAP_DEFAULT_EXT_WINDOW);
3e6b3b95
GP		 2393 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
2394 chan->tx_win);
6327eb98 2395 break;
f2fcfcd6
GP		 2396 }
2397 }
2398
0c1bc5c6 2399 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
6c2ea7a8
GP		 2400 return -ECONNREFUSED;
2401
0c1bc5c6 2402 chan->mode = rfc.mode;
6c2ea7a8 2403
0e8b207e 2404 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
f2fcfcd6
GP		 2405 switch (rfc.mode) {
2406 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2407 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2408 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2409 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2410 break;
2411 case L2CAP_MODE_STREAMING:
47d1ec61 2412 chan->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2413 }
2414 }
2415
fe4128e0 2416 req->dcid = cpu_to_le16(chan->dcid);
f2fcfcd6
GP		 2417 req->flags = cpu_to_le16(0x0000);
2418
2419 return ptr - data;
2420}
2421
fe4128e0 2422static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1da177e4
LT		 2423{
2424 struct l2cap_conf_rsp *rsp = data;
2425 void *ptr = rsp->data;
1da177e4 2426
fe4128e0 2427 BT_DBG("chan %p", chan);
1da177e4 2428
fe4128e0 2429 rsp->scid = cpu_to_le16(chan->dcid);
5dee9e7c 2430 rsp->result = cpu_to_le16(result);
aca3192c 2431 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2432
2433 return ptr - data;
2434}
2435
8c1d787b 2436void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
710f9b0a
GP		 2437{
2438 struct l2cap_conn_rsp rsp;
8c1d787b 2439 struct l2cap_conn *conn = chan->conn;
710f9b0a
GP		 2440 u8 buf[128];
2441
fe4128e0
GP		 2442 rsp.scid = cpu_to_le16(chan->dcid);
2443 rsp.dcid = cpu_to_le16(chan->scid);
710f9b0a
GP		 2444 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
2445 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
2446 l2cap_send_cmd(conn, chan->ident,
2447 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2448
c1360a1c 2449 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
710f9b0a
GP		 2450 return;
2451
710f9b0a
GP		 2452 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2453 l2cap_build_conf_req(chan, buf), buf);
2454 chan->num_conf_req++;
2455}
2456
47d1ec61 2457static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
7b1c0049 2458{
7b1c0049
GP		 2459 int type, olen;
2460 unsigned long val;
2461 struct l2cap_conf_rfc rfc;
2462
47d1ec61 2463 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
7b1c0049 2464
0c1bc5c6 2465 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
7b1c0049
GP		 2466 return;
2467
2468 while (len >= L2CAP_CONF_OPT_SIZE) {
2469 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2470
2471 switch (type) {
2472 case L2CAP_CONF_RFC:
2473 if (olen == sizeof(rfc))
2474 memcpy(&rfc, (void *)val, olen);
2475 goto done;
2476 }
2477 }
2478
2479done:
2480 switch (rfc.mode) {
2481 case L2CAP_MODE_ERTM:
47d1ec61
GP		 2482 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2483 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2484 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2485 break;
2486 case L2CAP_MODE_STREAMING:
47d1ec61 2487 chan->mps = le16_to_cpu(rfc.max_pdu_size);
7b1c0049
GP		 2488 }
2489}
2490
4e8402a3
MH		 2491static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2492{
e2fd318e 2493 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
4e8402a3 2494
e2fd318e 2495 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
4e8402a3
MH		 2496 return 0;
2497
2498 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2499 cmd->ident == conn->info_ident) {
4e8402a3 2500 del_timer(&conn->info_timer);
984947dc
MH		 2501
2502 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2503 conn->info_ident = 0;
984947dc 2504
4e8402a3
MH		 2505 l2cap_conn_start(conn);
2506 }
2507
2508 return 0;
2509}
2510
1da177e4
LT		 2511static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2512{
1da177e4
LT		 2513 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2514 struct l2cap_conn_rsp rsp;
23691d75 2515 struct l2cap_chan *chan = NULL, *pchan;
d793fe8c 2516 struct sock *parent, *sk = NULL;
e7c29cb1 2517 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2518
2519 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2520 __le16 psm = req->psm;
1da177e4
LT		 2521
2522 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2523
2524 /* Check if we have socket listening on psm */
23691d75
GP		 2525 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src);
2526 if (!pchan) {
1da177e4
LT		 2527 result = L2CAP_CR_BAD_PSM;
2528 goto sendresp;
2529 }
2530
23691d75
GP		 2531 parent = pchan->sk;
2532
e0f0cb56
GP		 2533 bh_lock_sock(parent);
2534
e7c29cb1
MH		 2535 /* Check if the ACL is secure enough (if not SDP) */
2536 if (psm != cpu_to_le16(0x0001) &&
2537 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2538 conn->disc_reason = 0x05;
e7c29cb1
MH		 2539 result = L2CAP_CR_SEC_BLOCK;
2540 goto response;
2541 }
2542
1da177e4
LT		 2543 result = L2CAP_CR_NO_MEM;
2544
2545 /* Check for backlog size */
2546 if (sk_acceptq_is_full(parent)) {
8e87d142 2547 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2548 goto response;
2549 }
2550
80808e43
GP		 2551 chan = pchan->ops->new_connection(pchan->data);
2552 if (!chan)
1da177e4
LT		 2553 goto response;
2554
80808e43
GP		 2555 sk = chan->sk;
2556
baa7e1fa 2557 write_lock_bh(&conn->chan_lock);
1da177e4
LT		 2558
2559 /* Check if we already have channel with that dcid */
baa7e1fa
GP		 2560 if (__l2cap_get_chan_by_dcid(conn, scid)) {
2561 write_unlock_bh(&conn->chan_lock);
1da177e4 2562 sock_set_flag(sk, SOCK_ZAPPED);
ba3bd0ee 2563 chan->ops->close(chan->data);
1da177e4
LT		 2564 goto response;
2565 }
2566
2567 hci_conn_hold(conn->hcon);
2568
1da177e4
LT		 2569 bacpy(&bt_sk(sk)->src, conn->src);
2570 bacpy(&bt_sk(sk)->dst, conn->dst);
fe4128e0
GP		 2571 chan->psm = psm;
2572 chan->dcid = scid;
1da177e4 2573
d1010240
GP		 2574 bt_accept_enqueue(parent, sk);
2575
48454079
GP		 2576 __l2cap_chan_add(conn, chan);
2577
fe4128e0 2578 dcid = chan->scid;
1da177e4 2579
c9b66675 2580 __set_chan_timer(chan, sk->sk_sndtimeo);
1da177e4 2581
fc7f8a7e 2582 chan->ident = cmd->ident;
1da177e4 2583
984947dc 2584 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
4343478f 2585 if (l2cap_check_security(chan)) {
f66dc81f 2586 if (bt_sk(sk)->defer_setup) {
89bc500e 2587 l2cap_state_change(chan, BT_CONNECT2);
f66dc81f
MH		 2588 result = L2CAP_CR_PEND;
2589 status = L2CAP_CS_AUTHOR_PEND;
2590 parent->sk_data_ready(parent, 0);
2591 } else {
89bc500e 2592 l2cap_state_change(chan, BT_CONFIG);
f66dc81f
MH		 2593 result = L2CAP_CR_SUCCESS;
2594 status = L2CAP_CS_NO_INFO;
2595 }
79d554a6 2596 } else {
89bc500e 2597 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 2598 result = L2CAP_CR_PEND;
2599 status = L2CAP_CS_AUTHEN_PEND;
2600 }
2601 } else {
89bc500e 2602 l2cap_state_change(chan, BT_CONNECT2);
79d554a6
MH		 2603 result = L2CAP_CR_PEND;
2604 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2605 }
2606
baa7e1fa 2607 write_unlock_bh(&conn->chan_lock);
1da177e4
LT		 2608
2609response:
2610 bh_unlock_sock(parent);
2611
2612sendresp:
aca3192c
YH		 2613 rsp.scid = cpu_to_le16(scid);
2614 rsp.dcid = cpu_to_le16(dcid);
2615 rsp.result = cpu_to_le16(result);
2616 rsp.status = cpu_to_le16(status);
1da177e4 2617 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2618
2619 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2620 struct l2cap_info_req info;
2621 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2622
2623 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2624 conn->info_ident = l2cap_get_ident(conn);
2625
2626 mod_timer(&conn->info_timer, jiffies +
2627 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2628
2629 l2cap_send_cmd(conn, conn->info_ident,
2630 L2CAP_INFO_REQ, sizeof(info), &info);
2631 }
2632
c1360a1c 2633 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
e9aeb2dd
GP		 2634 result == L2CAP_CR_SUCCESS) {
2635 u8 buf[128];
c1360a1c 2636 set_bit(CONF_REQ_SENT, &chan->conf_state);
e9aeb2dd 2637 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2638 l2cap_build_conf_req(chan, buf), buf);
2639 chan->num_conf_req++;
e9aeb2dd
GP		 2640 }
2641
1da177e4
LT		 2642 return 0;
2643}
2644
2645static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2646{
2647 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2648 u16 scid, dcid, result, status;
48454079 2649 struct l2cap_chan *chan;
1da177e4
LT		 2650 struct sock *sk;
2651 u8 req[128];
2652
2653 scid = __le16_to_cpu(rsp->scid);
2654 dcid = __le16_to_cpu(rsp->dcid);
2655 result = __le16_to_cpu(rsp->result);
2656 status = __le16_to_cpu(rsp->status);
2657
2658 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2659
2660 if (scid) {
baa7e1fa 2661 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2662 if (!chan)
57d3b22b 2663 return -EFAULT;
1da177e4 2664 } else {
baa7e1fa 2665 chan = l2cap_get_chan_by_ident(conn, cmd->ident);
48454079 2666 if (!chan)
57d3b22b 2667 return -EFAULT;
1da177e4
LT		 2668 }
2669
48454079
GP		 2670 sk = chan->sk;
2671
1da177e4
LT		 2672 switch (result) {
2673 case L2CAP_CR_SUCCESS:
89bc500e 2674 l2cap_state_change(chan, BT_CONFIG);
fc7f8a7e 2675 chan->ident = 0;
fe4128e0 2676 chan->dcid = dcid;
c1360a1c 2677 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
6a8d3010 2678
c1360a1c 2679 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
e9aeb2dd
GP		 2680 break;
2681
1da177e4 2682 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2683 l2cap_build_conf_req(chan, req), req);
2684 chan->num_conf_req++;
1da177e4
LT		 2685 break;
2686
2687 case L2CAP_CR_PEND:
c1360a1c 2688 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4
LT		 2689 break;
2690
2691 default:
a49184c2
AE		 2692 /* don't delete l2cap channel if sk is owned by user */
2693 if (sock_owned_by_user(sk)) {
89bc500e 2694 l2cap_state_change(chan, BT_DISCONN);
c9b66675
GP		 2695 __clear_chan_timer(chan);
2696 __set_chan_timer(chan, HZ / 5);
a49184c2
AE		 2697 break;
2698 }
2699
48454079 2700 l2cap_chan_del(chan, ECONNREFUSED);
1da177e4
LT		 2701 break;
2702 }
2703
2704 bh_unlock_sock(sk);
2705 return 0;
2706}
2707
47d1ec61 2708static inline void set_default_fcs(struct l2cap_chan *chan)
8c462b60
MM		 2709{
2710 /* FCS is enabled only in ERTM or streaming mode, if one or both
2711 * sides request it.
2712 */
0c1bc5c6 2713 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
47d1ec61 2714 chan->fcs = L2CAP_FCS_NONE;
c1360a1c 2715 else if (!test_bit(CONF_NO_FCS_RECV, &chan->conf_state))
47d1ec61 2716 chan->fcs = L2CAP_FCS_CRC16;
8c462b60
MM		 2717}
2718
88219a0f 2719static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 2720{
2721 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2722 u16 dcid, flags;
2723 u8 rsp[64];
48454079 2724 struct l2cap_chan *chan;
1da177e4 2725 struct sock *sk;
5dee9e7c 2726 int len;
1da177e4
LT		 2727
2728 dcid = __le16_to_cpu(req->dcid);
2729 flags = __le16_to_cpu(req->flags);
2730
2731 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2732
baa7e1fa 2733 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 2734 if (!chan)
1da177e4
LT		 2735 return -ENOENT;
2736
48454079
GP		 2737 sk = chan->sk;
2738
033b1142 2739 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
e2fd318e
IK		 2740 struct l2cap_cmd_rej_cid rej;
2741
2742 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
2743 rej.scid = cpu_to_le16(chan->scid);
2744 rej.dcid = cpu_to_le16(chan->dcid);
df6bd743 2745
df6bd743
GP		 2746 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2747 sizeof(rej), &rej);
354f60a9 2748 goto unlock;
df6bd743 2749 }
354f60a9 2750
5dee9e7c 2751 /* Reject if config buffer is too small. */
88219a0f 2752 len = cmd_len - sizeof(*req);
7ac28817 2753 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
5dee9e7c 2754 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 2755 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c
MH		 2756 L2CAP_CONF_REJECT, flags), rsp);
2757 goto unlock;
2758 }
2759
2760 /* Store config. */
73ffa904
GP		 2761 memcpy(chan->conf_req + chan->conf_len, req->data, len);
2762 chan->conf_len += len;
1da177e4
LT		 2763
2764 if (flags & 0x0001) {
2765 /* Incomplete config. Send empty response. */
2766 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
fe4128e0 2767 l2cap_build_conf_rsp(chan, rsp,
5dee9e7c 2768 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 2769 goto unlock;
2770 }
2771
2772 /* Complete config. */
73ffa904 2773 len = l2cap_parse_conf_req(chan, rsp);
f2fcfcd6 2774 if (len < 0) {
e92c8e70 2775 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4 2776 goto unlock;
f2fcfcd6 2777 }
1da177e4 2778
5dee9e7c 2779 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
73ffa904 2780 chan->num_conf_rsp++;
5dee9e7c 2781
5dee9e7c 2782 /* Reset config buffer. */
73ffa904 2783 chan->conf_len = 0;
5dee9e7c 2784
c1360a1c 2785 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
876d9484
MH		 2786 goto unlock;
2787
c1360a1c 2788 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
47d1ec61 2789 set_default_fcs(chan);
fcc203c3 2790
89bc500e 2791 l2cap_state_change(chan, BT_CONNECTED);
e90bac06 2792
42e5c802
GP		 2793 chan->next_tx_seq = 0;
2794 chan->expected_tx_seq = 0;
58d35f87 2795 skb_queue_head_init(&chan->tx_q);
0c1bc5c6 2796 if (chan->mode == L2CAP_MODE_ERTM)
525cd185 2797 l2cap_ertm_init(chan);
0565c1c2 2798
1da177e4 2799 l2cap_chan_ready(sk);
876d9484
MH		 2800 goto unlock;
2801 }
2802
c1360a1c 2803 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
79d554a6 2804 u8 buf[64];
1da177e4 2805 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
73ffa904
GP		 2806 l2cap_build_conf_req(chan, buf), buf);
2807 chan->num_conf_req++;
1da177e4
LT		 2808 }
2809
0e8b207e
AE		 2810 /* Got Conf Rsp PENDING from remote side and asume we sent
2811 Conf Rsp PENDING in the code above */
2812 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
2813 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
2814
2815 /* check compatibility */
2816
2817 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2818 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2819
2820 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 2821 l2cap_build_conf_rsp(chan, rsp,
0e8b207e
AE		 2822 L2CAP_CONF_SUCCESS, 0x0000), rsp);
2823 }
2824
1da177e4
LT		 2825unlock:
2826 bh_unlock_sock(sk);
2827 return 0;
2828}
2829
2830static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2831{
2832 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2833 u16 scid, flags, result;
48454079 2834 struct l2cap_chan *chan;
1da177e4 2835 struct sock *sk;
7b1c0049 2836 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 2837
2838 scid = __le16_to_cpu(rsp->scid);
2839 flags = __le16_to_cpu(rsp->flags);
2840 result = __le16_to_cpu(rsp->result);
2841
af05b30b
GP		 2842 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2843 scid, flags, result);
1da177e4 2844
baa7e1fa 2845 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2846 if (!chan)
1da177e4
LT		 2847 return 0;
2848
48454079
GP		 2849 sk = chan->sk;
2850
1da177e4
LT		 2851 switch (result) {
2852 case L2CAP_CONF_SUCCESS:
47d1ec61 2853 l2cap_conf_rfc_get(chan, rsp->data, len);
0e8b207e 2854 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
1da177e4
LT		 2855 break;
2856
0e8b207e
AE		 2857 case L2CAP_CONF_PENDING:
2858 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
2859
2860 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
2861 char buf[64];
2862
2863 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2864 buf, &result);
2865 if (len < 0) {
2866 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2867 goto done;
2868 }
2869
2870 /* check compatibility */
2871
2872 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
2873 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
2874
2875 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3e6b3b95 2876 l2cap_build_conf_rsp(chan, buf,
0e8b207e
AE		 2877 L2CAP_CONF_SUCCESS, 0x0000), buf);
2878 }
2879 goto done;
2880
1da177e4 2881 case L2CAP_CONF_UNACCEPT:
73ffa904 2882 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 2883 char req[64];
2884
c2c77ec8 2885 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
e92c8e70 2886 l2cap_send_disconn_req(conn, chan, ECONNRESET);
c2c77ec8
AE		 2887 goto done;
2888 }
2889
f2fcfcd6
GP		 2890 /* throw out any old stored conf requests */
2891 result = L2CAP_CONF_SUCCESS;
b4450035
GP		 2892 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2893 req, &result);
f2fcfcd6 2894 if (len < 0) {
e92c8e70 2895 l2cap_send_disconn_req(conn, chan, ECONNRESET);
f2fcfcd6
GP		 2896 goto done;
2897 }
2898
2899 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2900 L2CAP_CONF_REQ, len, req);
73ffa904 2901 chan->num_conf_req++;
f2fcfcd6
GP		 2902 if (result != L2CAP_CONF_SUCCESS)
2903 goto done;
2904 break;
1da177e4
LT		 2905 }
2906
8e87d142 2907 default:
b1235d79 2908 sk->sk_err = ECONNRESET;
c9b66675 2909 __set_chan_timer(chan, HZ * 5);
e92c8e70 2910 l2cap_send_disconn_req(conn, chan, ECONNRESET);
1da177e4
LT		 2911 goto done;
2912 }
2913
2914 if (flags & 0x01)
2915 goto done;
2916
c1360a1c 2917 set_bit(CONF_INPUT_DONE, &chan->conf_state);
1da177e4 2918
c1360a1c 2919 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
47d1ec61 2920 set_default_fcs(chan);
fcc203c3 2921
89bc500e 2922 l2cap_state_change(chan, BT_CONNECTED);
42e5c802
GP		 2923 chan->next_tx_seq = 0;
2924 chan->expected_tx_seq = 0;
58d35f87 2925 skb_queue_head_init(&chan->tx_q);
0c1bc5c6 2926 if (chan->mode == L2CAP_MODE_ERTM)
525cd185 2927 l2cap_ertm_init(chan);
0565c1c2 2928
1da177e4
LT		 2929 l2cap_chan_ready(sk);
2930 }
2931
2932done:
2933 bh_unlock_sock(sk);
2934 return 0;
2935}
2936
2937static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2938{
2939 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
2940 struct l2cap_disconn_rsp rsp;
2941 u16 dcid, scid;
48454079 2942 struct l2cap_chan *chan;
1da177e4
LT		 2943 struct sock *sk;
2944
2945 scid = __le16_to_cpu(req->scid);
2946 dcid = __le16_to_cpu(req->dcid);
2947
2948 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
2949
baa7e1fa 2950 chan = l2cap_get_chan_by_scid(conn, dcid);
48454079 2951 if (!chan)
1da177e4
LT		 2952 return 0;
2953
48454079
GP		 2954 sk = chan->sk;
2955
fe4128e0
GP		 2956 rsp.dcid = cpu_to_le16(chan->scid);
2957 rsp.scid = cpu_to_le16(chan->dcid);
1da177e4
LT		 2958 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
2959
2960 sk->sk_shutdown = SHUTDOWN_MASK;
2961
a49184c2
AE		 2962 /* don't delete l2cap channel if sk is owned by user */
2963 if (sock_owned_by_user(sk)) {
89bc500e 2964 l2cap_state_change(chan, BT_DISCONN);
c9b66675
GP		 2965 __clear_chan_timer(chan);
2966 __set_chan_timer(chan, HZ / 5);
a49184c2
AE		 2967 bh_unlock_sock(sk);
2968 return 0;
2969 }
2970
48454079 2971 l2cap_chan_del(chan, ECONNRESET);
1da177e4
LT		 2972 bh_unlock_sock(sk);
2973
ba3bd0ee 2974 chan->ops->close(chan->data);
1da177e4
LT		 2975 return 0;
2976}
2977
2978static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2979{
2980 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
2981 u16 dcid, scid;
48454079 2982 struct l2cap_chan *chan;
1da177e4
LT		 2983 struct sock *sk;
2984
2985 scid = __le16_to_cpu(rsp->scid);
2986 dcid = __le16_to_cpu(rsp->dcid);
2987
2988 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
2989
baa7e1fa 2990 chan = l2cap_get_chan_by_scid(conn, scid);
48454079 2991 if (!chan)
1da177e4
LT		 2992 return 0;
2993
48454079
GP		 2994 sk = chan->sk;
2995
a49184c2
AE		 2996 /* don't delete l2cap channel if sk is owned by user */
2997 if (sock_owned_by_user(sk)) {
89bc500e 2998 l2cap_state_change(chan,BT_DISCONN);
c9b66675
GP		 2999 __clear_chan_timer(chan);
3000 __set_chan_timer(chan, HZ / 5);
a49184c2
AE		 3001 bh_unlock_sock(sk);
3002 return 0;
3003 }
3004
48454079 3005 l2cap_chan_del(chan, 0);
1da177e4
LT		 3006 bh_unlock_sock(sk);
3007
ba3bd0ee 3008 chan->ops->close(chan->data);
1da177e4
LT		 3009 return 0;
3010}
3011
3012static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3013{
3014 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3015 u16 type;
3016
3017 type = __le16_to_cpu(req->type);
3018
3019 BT_DBG("type 0x%4.4x", type);
3020
f0709e03
MH		 3021 if (type == L2CAP_IT_FEAT_MASK) {
3022 u8 buf[8];
44dd46de 3023 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3024 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3025 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3026 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3027 if (!disable_ertm)
fcc203c3
GP		 3028 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3029 | L2CAP_FEAT_FCS;
a5fd6f30 3030 if (enable_hs)
6327eb98
AE		 3031 feat_mask |= L2CAP_FEAT_EXT_FLOW
3032 | L2CAP_FEAT_EXT_WINDOW;
a5fd6f30 3033
1b7bf4ed 3034 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3035 l2cap_send_cmd(conn, cmd->ident,
3036 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3037 } else if (type == L2CAP_IT_FIXED_CHAN) {
3038 u8 buf[12];
3039 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
50a147cd
MM		 3040
3041 if (enable_hs)
3042 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
3043 else
3044 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
3045
e1027a7c
MH		 3046 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3047 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
c6337ea6 3048 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
e1027a7c
MH		 3049 l2cap_send_cmd(conn, cmd->ident,
3050 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3051 } else {
3052 struct l2cap_info_rsp rsp;
3053 rsp.type = cpu_to_le16(type);
3054 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3055 l2cap_send_cmd(conn, cmd->ident,
3056 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3057 }
1da177e4
LT		 3058
3059 return 0;
3060}
3061
3062static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3063{
3064 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3065 u16 type, result;
3066
3067 type = __le16_to_cpu(rsp->type);
3068 result = __le16_to_cpu(rsp->result);
3069
3070 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3071
e90165be
AE		 3072 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
3073 if (cmd->ident != conn->info_ident ||
3074 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
3075 return 0;
3076
4e8402a3
MH		 3077 del_timer(&conn->info_timer);
3078
adb08ede
VT		 3079 if (result != L2CAP_IR_SUCCESS) {
3080 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3081 conn->info_ident = 0;
3082
3083 l2cap_conn_start(conn);
3084
3085 return 0;
3086 }
3087
984947dc 3088 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3089 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3090
47ec1dcd 3091 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3092 struct l2cap_info_req req;
3093 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3094
3095 conn->info_ident = l2cap_get_ident(conn);
3096
3097 l2cap_send_cmd(conn, conn->info_ident,
3098 L2CAP_INFO_REQ, sizeof(req), &req);
3099 } else {
3100 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3101 conn->info_ident = 0;
3102
3103 l2cap_conn_start(conn);
3104 }
3105 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3106 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3107 conn->info_ident = 0;
984947dc
MH		 3108
3109 l2cap_conn_start(conn);
3110 }
4e8402a3 3111
1da177e4
LT		 3112 return 0;
3113}
3114
f94ff6ff
MM		 3115static inline int l2cap_create_channel_req(struct l2cap_conn *conn,
3116 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3117 void *data)
3118{
3119 struct l2cap_create_chan_req *req = data;
3120 struct l2cap_create_chan_rsp rsp;
3121 u16 psm, scid;
3122
3123 if (cmd_len != sizeof(*req))
3124 return -EPROTO;
3125
3126 if (!enable_hs)
3127 return -EINVAL;
3128
3129 psm = le16_to_cpu(req->psm);
3130 scid = le16_to_cpu(req->scid);
3131
3132 BT_DBG("psm %d, scid %d, amp_id %d", psm, scid, req->amp_id);
3133
3134 /* Placeholder: Always reject */
3135 rsp.dcid = 0;
3136 rsp.scid = cpu_to_le16(scid);
3137 rsp.result = L2CAP_CR_NO_MEM;
3138 rsp.status = L2CAP_CS_NO_INFO;
3139
3140 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
3141 sizeof(rsp), &rsp);
3142
3143 return 0;
3144}
3145
3146static inline int l2cap_create_channel_rsp(struct l2cap_conn *conn,
3147 struct l2cap_cmd_hdr *cmd, void *data)
3148{
3149 BT_DBG("conn %p", conn);
3150
3151 return l2cap_connect_rsp(conn, cmd, data);
3152}
3153
8d5a04a1
MM		 3154static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
3155 u16 icid, u16 result)
3156{
3157 struct l2cap_move_chan_rsp rsp;
3158
3159 BT_DBG("icid %d, result %d", icid, result);
3160
3161 rsp.icid = cpu_to_le16(icid);
3162 rsp.result = cpu_to_le16(result);
3163
3164 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
3165}
3166
3167static void l2cap_send_move_chan_cfm(struct l2cap_conn *conn,
3168 struct l2cap_chan *chan, u16 icid, u16 result)
3169{
3170 struct l2cap_move_chan_cfm cfm;
3171 u8 ident;
3172
3173 BT_DBG("icid %d, result %d", icid, result);
3174
3175 ident = l2cap_get_ident(conn);
3176 if (chan)
3177 chan->ident = ident;
3178
3179 cfm.icid = cpu_to_le16(icid);
3180 cfm.result = cpu_to_le16(result);
3181
3182 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM, sizeof(cfm), &cfm);
3183}
3184
3185static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
3186 u16 icid)
3187{
3188 struct l2cap_move_chan_cfm_rsp rsp;
3189
3190 BT_DBG("icid %d", icid);
3191
3192 rsp.icid = cpu_to_le16(icid);
3193 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
3194}
3195
3196static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
3197 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3198{
3199 struct l2cap_move_chan_req *req = data;
3200 u16 icid = 0;
3201 u16 result = L2CAP_MR_NOT_ALLOWED;
3202
3203 if (cmd_len != sizeof(*req))
3204 return -EPROTO;
3205
3206 icid = le16_to_cpu(req->icid);
3207
3208 BT_DBG("icid %d, dest_amp_id %d", icid, req->dest_amp_id);
3209
3210 if (!enable_hs)
3211 return -EINVAL;
3212
3213 /* Placeholder: Always refuse */
3214 l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
3215
3216 return 0;
3217}
3218
3219static inline int l2cap_move_channel_rsp(struct l2cap_conn *conn,
3220 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3221{
3222 struct l2cap_move_chan_rsp *rsp = data;
3223 u16 icid, result;
3224
3225 if (cmd_len != sizeof(*rsp))
3226 return -EPROTO;
3227
3228 icid = le16_to_cpu(rsp->icid);
3229 result = le16_to_cpu(rsp->result);
3230
3231 BT_DBG("icid %d, result %d", icid, result);
3232
3233 /* Placeholder: Always unconfirmed */
3234 l2cap_send_move_chan_cfm(conn, NULL, icid, L2CAP_MC_UNCONFIRMED);
3235
3236 return 0;
3237}
3238
3239static inline int l2cap_move_channel_confirm(struct l2cap_conn *conn,
3240 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3241{
3242 struct l2cap_move_chan_cfm *cfm = data;
3243 u16 icid, result;
3244
3245 if (cmd_len != sizeof(*cfm))
3246 return -EPROTO;
3247
3248 icid = le16_to_cpu(cfm->icid);
3249 result = le16_to_cpu(cfm->result);
3250
3251 BT_DBG("icid %d, result %d", icid, result);
3252
3253 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
3254
3255 return 0;
3256}
3257
3258static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
3259 struct l2cap_cmd_hdr *cmd, u16 cmd_len, void *data)
3260{
3261 struct l2cap_move_chan_cfm_rsp *rsp = data;
3262 u16 icid;
3263
3264 if (cmd_len != sizeof(*rsp))
3265 return -EPROTO;
3266
3267 icid = le16_to_cpu(rsp->icid);
3268
3269 BT_DBG("icid %d", icid);
3270
3271 return 0;
3272}
3273
e2174ca4 3274static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
de73115a
CT		 3275 u16 to_multiplier)
3276{
3277 u16 max_latency;
3278
3279 if (min > max || min < 6 || max > 3200)
3280 return -EINVAL;
3281
3282 if (to_multiplier < 10 || to_multiplier > 3200)
3283 return -EINVAL;
3284
3285 if (max >= to_multiplier * 8)
3286 return -EINVAL;
3287
3288 max_latency = (to_multiplier * 8 / max) - 1;
3289 if (latency > 499 || latency > max_latency)
3290 return -EINVAL;
3291
3292 return 0;
3293}
3294
3295static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
3296 struct l2cap_cmd_hdr *cmd, u8 *data)
3297{
3298 struct hci_conn *hcon = conn->hcon;
3299 struct l2cap_conn_param_update_req *req;
3300 struct l2cap_conn_param_update_rsp rsp;
3301 u16 min, max, latency, to_multiplier, cmd_len;
2ce603eb 3302 int err;
de73115a
CT		 3303
3304 if (!(hcon->link_mode & HCI_LM_MASTER))
3305 return -EINVAL;
3306
3307 cmd_len = __le16_to_cpu(cmd->len);
3308 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
3309 return -EPROTO;
3310
3311 req = (struct l2cap_conn_param_update_req *) data;
e2174ca4
GP		 3312 min = __le16_to_cpu(req->min);
3313 max = __le16_to_cpu(req->max);
de73115a
CT		 3314 latency = __le16_to_cpu(req->latency);
3315 to_multiplier = __le16_to_cpu(req->to_multiplier);
3316
3317 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
3318 min, max, latency, to_multiplier);
3319
3320 memset(&rsp, 0, sizeof(rsp));
2ce603eb
CT		 3321
3322 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
3323 if (err)
de73115a
CT		 3324 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
3325 else
3326 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
3327
3328 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
3329 sizeof(rsp), &rsp);
3330
2ce603eb
CT		 3331 if (!err)
3332 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
3333
de73115a
CT		 3334 return 0;
3335}
3336
3300d9a9
CT		 3337static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
3338 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3339{
3340 int err = 0;
3341
3342 switch (cmd->code) {
3343 case L2CAP_COMMAND_REJ:
3344 l2cap_command_rej(conn, cmd, data);
3345 break;
3346
3347 case L2CAP_CONN_REQ:
3348 err = l2cap_connect_req(conn, cmd, data);
3349 break;
3350
3351 case L2CAP_CONN_RSP:
3352 err = l2cap_connect_rsp(conn, cmd, data);
3353 break;
3354
3355 case L2CAP_CONF_REQ:
3356 err = l2cap_config_req(conn, cmd, cmd_len, data);
3357 break;
3358
3359 case L2CAP_CONF_RSP:
3360 err = l2cap_config_rsp(conn, cmd, data);
3361 break;
3362
3363 case L2CAP_DISCONN_REQ:
3364 err = l2cap_disconnect_req(conn, cmd, data);
3365 break;
3366
3367 case L2CAP_DISCONN_RSP:
3368 err = l2cap_disconnect_rsp(conn, cmd, data);
3369 break;
3370
3371 case L2CAP_ECHO_REQ:
3372 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
3373 break;
3374
3375 case L2CAP_ECHO_RSP:
3376 break;
3377
3378 case L2CAP_INFO_REQ:
3379 err = l2cap_information_req(conn, cmd, data);
3380 break;
3381
3382 case L2CAP_INFO_RSP:
3383 err = l2cap_information_rsp(conn, cmd, data);
3384 break;
3385
f94ff6ff
MM		 3386 case L2CAP_CREATE_CHAN_REQ:
3387 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
3388 break;
3389
3390 case L2CAP_CREATE_CHAN_RSP:
3391 err = l2cap_create_channel_rsp(conn, cmd, data);
3392 break;
3393
8d5a04a1
MM		 3394 case L2CAP_MOVE_CHAN_REQ:
3395 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
3396 break;
3397
3398 case L2CAP_MOVE_CHAN_RSP:
3399 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
3400 break;
3401
3402 case L2CAP_MOVE_CHAN_CFM:
3403 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
3404 break;
3405
3406 case L2CAP_MOVE_CHAN_CFM_RSP:
3407 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
3408 break;
3409
3300d9a9
CT		 3410 default:
3411 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
3412 err = -EINVAL;
3413 break;
3414 }
3415
3416 return err;
3417}
3418
3419static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
3420 struct l2cap_cmd_hdr *cmd, u8 *data)
3421{
3422 switch (cmd->code) {
3423 case L2CAP_COMMAND_REJ:
3424 return 0;
3425
3426 case L2CAP_CONN_PARAM_UPDATE_REQ:
de73115a 3427 return l2cap_conn_param_update_req(conn, cmd, data);
3300d9a9
CT		 3428
3429 case L2CAP_CONN_PARAM_UPDATE_RSP:
3430 return 0;
3431
3432 default:
3433 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
3434 return -EINVAL;
3435 }
3436}
3437
3438static inline void l2cap_sig_channel(struct l2cap_conn *conn,
3439 struct sk_buff *skb)
1da177e4
LT		 3440{
3441 u8 *data = skb->data;
3442 int len = skb->len;
3443 struct l2cap_cmd_hdr cmd;
3300d9a9 3444 int err;
1da177e4
LT		 3445
3446 l2cap_raw_recv(conn, skb);
3447
3448 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3449 u16 cmd_len;
1da177e4
LT		 3450 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3451 data += L2CAP_CMD_HDR_SIZE;
3452 len -= L2CAP_CMD_HDR_SIZE;
3453
88219a0f 3454 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3455
88219a0f 3456 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3457
88219a0f 3458 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3459 BT_DBG("corrupted command");
3460 break;
3461 }
3462
3300d9a9
CT		 3463 if (conn->hcon->type == LE_LINK)
3464 err = l2cap_le_sig_cmd(conn, &cmd, data);
3465 else
3466 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
1da177e4
LT		 3467
3468 if (err) {
e2fd318e 3469 struct l2cap_cmd_rej_unk rej;
2c6d1a2e
GP		 3470
3471 BT_ERR("Wrong link type (%d)", err);
1da177e4
LT		 3472
3473 /* FIXME: Map err to a valid reason */
e2fd318e 3474 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
1da177e4
LT		 3475 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3476 }
3477
88219a0f
AV		 3478 data += cmd_len;
3479 len -= cmd_len;
1da177e4
LT		 3480 }
3481
3482 kfree_skb(skb);
3483}
3484
47d1ec61 3485static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
fcc203c3
GP		 3486{
3487 u16 our_fcs, rcv_fcs;
e4ca6d98
AE		 3488 int hdr_size;
3489
3490 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3491 hdr_size = L2CAP_EXT_HDR_SIZE;
3492 else
3493 hdr_size = L2CAP_ENH_HDR_SIZE;
fcc203c3 3494
47d1ec61 3495 if (chan->fcs == L2CAP_FCS_CRC16) {
03a51213 3496 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
fcc203c3
GP		 3497 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3498 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3499
3500 if (our_fcs != rcv_fcs)
7a560e5c 3501 return -EBADMSG;
fcc203c3
GP		 3502 }
3503 return 0;
3504}
3505
525cd185 3506static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
d5392c8f 3507{
88843ab0 3508 u32 control = 0;
d5392c8f 3509
6a026610 3510 chan->frames_sent = 0;
d5392c8f 3511
0b209fae 3512 control |= __set_reqseq(chan, chan->buffer_seq);
d5392c8f 3513
e2ab4353 3514 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
ab784b73 3515 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
525cd185 3516 l2cap_send_sframe(chan, control);
e2ab4353 3517 set_bit(CONN_RNR_SENT, &chan->conn_state);
d5392c8f
GP		 3518 }
3519
e2ab4353 3520 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
525cd185 3521 l2cap_retransmit_frames(chan);
d5392c8f 3522
525cd185 3523 l2cap_ertm_send(chan);
d5392c8f 3524
e2ab4353 3525 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
6a026610 3526 chan->frames_sent == 0) {
ab784b73 3527 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 3528 l2cap_send_sframe(chan, control);
d5392c8f
GP		 3529 }
3530}
3531
fb45de7d 3532static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u16 tx_seq, u8 sar)
8f17154f
GP		 3533{
3534 struct sk_buff *next_skb;
bfbacc11 3535 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3536
3537 bt_cb(skb)->tx_seq = tx_seq;
3538 bt_cb(skb)->sar = sar;
3539
f1c6775b 3540 next_skb = skb_peek(&chan->srej_q);
8f17154f 3541 if (!next_skb) {
f1c6775b 3542 __skb_queue_tail(&chan->srej_q, skb);
9b53350d 3543 return 0;
8f17154f
GP		 3544 }
3545
836be934 3546 tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
bfbacc11 3547
8f17154f 3548 do {
9b53350d
JPRV		 3549 if (bt_cb(next_skb)->tx_seq == tx_seq)
3550 return -EINVAL;
3551
836be934
AE		 3552 next_tx_seq_offset = __seq_offset(chan,
3553 bt_cb(next_skb)->tx_seq, chan->buffer_seq);
bfbacc11
JPRV		 3554
3555 if (next_tx_seq_offset > tx_seq_offset) {
f1c6775b 3556 __skb_queue_before(&chan->srej_q, next_skb, skb);
9b53350d 3557 return 0;
8f17154f
GP		 3558 }
3559
f1c6775b 3560 if (skb_queue_is_last(&chan->srej_q, next_skb))
8f17154f
GP		 3561 break;
3562
f1c6775b 3563 } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb)));
8f17154f 3564
f1c6775b 3565 __skb_queue_tail(&chan->srej_q, skb);
9b53350d
JPRV		 3566
3567 return 0;
8f17154f
GP		 3568}
3569
84084a31
MM		 3570static void append_skb_frag(struct sk_buff *skb,
3571 struct sk_buff *new_frag, struct sk_buff **last_frag)
18778a63 3572{
84084a31
MM		 3573 /* skb->len reflects data in skb as well as all fragments
3574 * skb->data_len reflects only data in fragments
3575 */
3576 if (!skb_has_frag_list(skb))
3577 skb_shinfo(skb)->frag_list = new_frag;
3578
3579 new_frag->next = NULL;
3580
3581 (*last_frag)->next = new_frag;
3582 *last_frag = new_frag;
3583
3584 skb->len += new_frag->len;
3585 skb->data_len += new_frag->len;
3586 skb->truesize += new_frag->truesize;
3587}
3588
88843ab0 3589static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u32 control)
84084a31
MM		 3590{
3591 int err = -EINVAL;
18778a63 3592
7e0ef6ee
AE		 3593 switch (__get_ctrl_sar(chan, control)) {
3594 case L2CAP_SAR_UNSEGMENTED:
84084a31
MM		 3595 if (chan->sdu)
3596 break;
18778a63 3597
84084a31
MM		 3598 err = chan->ops->recv(chan->data, skb);
3599 break;
18778a63 3600
7e0ef6ee 3601 case L2CAP_SAR_START:
84084a31
MM		 3602 if (chan->sdu)
3603 break;
18778a63 3604
6f61fd47 3605 chan->sdu_len = get_unaligned_le16(skb->data);
03a51213 3606 skb_pull(skb, L2CAP_SDULEN_SIZE);
18778a63 3607
84084a31
MM		 3608 if (chan->sdu_len > chan->imtu) {
3609 err = -EMSGSIZE;
3610 break;
3611 }
1890d36b 3612
84084a31
MM		 3613 if (skb->len >= chan->sdu_len)
3614 break;
18778a63 3615
84084a31
MM		 3616 chan->sdu = skb;
3617 chan->sdu_last_frag = skb;
18778a63 3618
84084a31
MM		 3619 skb = NULL;
3620 err = 0;
18778a63
GP		 3621 break;
3622
7e0ef6ee 3623 case L2CAP_SAR_CONTINUE:
6f61fd47 3624 if (!chan->sdu)
84084a31 3625 break;
18778a63 3626
84084a31
MM		 3627 append_skb_frag(chan->sdu, skb,
3628 &chan->sdu_last_frag);
3629 skb = NULL;
18778a63 3630
84084a31
MM		 3631 if (chan->sdu->len >= chan->sdu_len)
3632 break;
4178ba46 3633
84084a31 3634 err = 0;
18778a63
GP		 3635 break;
3636
7e0ef6ee 3637 case L2CAP_SAR_END:
6f61fd47 3638 if (!chan->sdu)
84084a31 3639 break;
18778a63 3640
84084a31
MM		 3641 append_skb_frag(chan->sdu, skb,
3642 &chan->sdu_last_frag);
3643 skb = NULL;
4178ba46 3644
84084a31
MM		 3645 if (chan->sdu->len != chan->sdu_len)
3646 break;
18778a63 3647
84084a31 3648 err = chan->ops->recv(chan->data, chan->sdu);
1890d36b 3649
84084a31
MM		 3650 if (!err) {
3651 /* Reassembly complete */
3652 chan->sdu = NULL;
3653 chan->sdu_last_frag = NULL;
3654 chan->sdu_len = 0;
1890d36b 3655 }
18778a63
GP		 3656 break;
3657 }
3658
84084a31
MM		 3659 if (err) {
3660 kfree_skb(skb);
3661 kfree_skb(chan->sdu);
3662 chan->sdu = NULL;
3663 chan->sdu_last_frag = NULL;
3664 chan->sdu_len = 0;
3665 }
18778a63 3666
84084a31 3667 return err;
18778a63
GP		 3668}
3669
26f880d2 3670static void l2cap_ertm_enter_local_busy(struct l2cap_chan *chan)
712132eb 3671{
88843ab0 3672 u32 control;
712132eb 3673
26f880d2 3674 BT_DBG("chan %p, Enter local busy", chan);
712132eb 3675
26f880d2
MM		 3676 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3677
0b209fae 3678 control = __set_reqseq(chan, chan->buffer_seq);
ab784b73 3679 control |= __set_ctrl_super(chan, L2CAP_SUPER_RNR);
26f880d2
MM		 3680 l2cap_send_sframe(chan, control);
3681
3682 set_bit(CONN_RNR_SENT, &chan->conn_state);
3683
3684 __clear_ack_timer(chan);
3685}
3686
3687static void l2cap_ertm_exit_local_busy(struct l2cap_chan *chan)
3688{
88843ab0 3689 u32 control;
712132eb 3690
e2ab4353 3691 if (!test_bit(CONN_RNR_SENT, &chan->conn_state))
712132eb
GP		 3692 goto done;
3693
0b209fae 3694 control = __set_reqseq(chan, chan->buffer_seq);
e3781735 3695 control |= __set_ctrl_poll(chan);
ab784b73 3696 control |= __set_ctrl_super(chan, L2CAP_SUPER_RR);
525cd185 3697 l2cap_send_sframe(chan, control);
6a026610 3698 chan->retry_count = 1;
712132eb 3699
1a09bcb9
GP		 3700 __clear_retrans_timer(chan);
3701 __set_monitor_timer(chan);
712132eb 3702
e2ab4353 3703 set_bit(CONN_WAIT_F, &chan->conn_state);
712132eb
GP		 3704
3705done:
e2ab4353
GP		 3706 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
3707 clear_bit(CONN_RNR_SENT, &chan->conn_state);
712132eb 3708
49208c9c 3709 BT_DBG("chan %p, Exit local busy", chan);
712132eb
GP		 3710}
3711
e328140f 3712void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
1890d36b 3713{
e328140f
MM		 3714 if (chan->mode == L2CAP_MODE_ERTM) {
3715 if (busy)
3716 l2cap_ertm_enter_local_busy(chan);
3717 else
3718 l2cap_ertm_exit_local_busy(chan);
1890d36b 3719 }
1890d36b
GP		 3720}
3721
fb45de7d 3722static void l2cap_check_srej_gap(struct l2cap_chan *chan, u16 tx_seq)
8f17154f
GP		 3723{
3724 struct sk_buff *skb;
88843ab0 3725 u32 control;
8f17154f 3726
e328140f
MM		 3727 while ((skb = skb_peek(&chan->srej_q)) &&
3728 !test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
3729 int err;
3730
8f17154f
GP		 3731 if (bt_cb(skb)->tx_seq != tx_seq)
3732 break;
3733
f1c6775b 3734 skb = skb_dequeue(&chan->srej_q);
7e0ef6ee 3735 control = __set_ctrl_sar(chan, bt_cb(skb)->sar);
84084a31 3736 err = l2cap_reassemble_sdu(chan, skb, control);
e328140f
MM		 3737
3738 if (err < 0) {
3739 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3740 break;
3741 }
3742
836be934
AE		 3743 chan->buffer_seq_srej = __next_seq(chan, chan->buffer_seq_srej);
3744 tx_seq = __next_seq(chan, tx_seq);
8f17154f
GP		 3745 }
3746}
3747
fb45de7d 3748static void l2cap_resend_srejframe(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 3749{
8f17154f 3750 struct srej_list *l, *tmp;
88843ab0 3751 u32 control;
8f17154f 3752
39d5a3ee 3753 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
8f17154f
GP		 3754 if (l->tx_seq == tx_seq) {
3755 list_del(&l->list);
3756 kfree(l);
3757 return;
3758 }
ab784b73 3759 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
0b209fae 3760 control |= __set_reqseq(chan, l->tx_seq);
525cd185 3761 l2cap_send_sframe(chan, control);
8f17154f 3762 list_del(&l->list);
39d5a3ee 3763 list_add_tail(&l->list, &chan->srej_l);
8f17154f
GP		 3764 }
3765}
3766
fb45de7d 3767static void l2cap_send_srejframe(struct l2cap_chan *chan, u16 tx_seq)
8f17154f 3768{
8f17154f 3769 struct srej_list *new;
88843ab0 3770 u32 control;
8f17154f 3771
42e5c802 3772 while (tx_seq != chan->expected_tx_seq) {
ab784b73 3773 control = __set_ctrl_super(chan, L2CAP_SUPER_SREJ);
0b209fae 3774 control |= __set_reqseq(chan, chan->expected_tx_seq);
525cd185 3775 l2cap_send_sframe(chan, control);
8f17154f
GP		 3776
3777 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
42e5c802 3778 new->tx_seq = chan->expected_tx_seq;
836be934
AE		 3779
3780 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
3781
39d5a3ee 3782 list_add_tail(&new->list, &chan->srej_l);
8f17154f 3783 }
836be934
AE		 3784
3785 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
8f17154f
GP		 3786}
3787
88843ab0 3788static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
1c2acffb 3789{
fb45de7d 3790 u16 tx_seq = __get_txseq(chan, rx_control);
0b209fae 3791 u16 req_seq = __get_reqseq(chan, rx_control);
7e0ef6ee 3792 u8 sar = __get_ctrl_sar(chan, rx_control);
f6337c77 3793 int tx_seq_offset, expected_tx_seq_offset;
47d1ec61 3794 int num_to_ack = (chan->tx_win/6) + 1;
1c2acffb
GP		 3795 int err = 0;
3796
88843ab0 3797 BT_DBG("chan %p len %d tx_seq %d rx_control 0x%8.8x", chan, skb->len,
525cd185 3798 tx_seq, rx_control);
1c2acffb 3799
03f6715d 3800 if (__is_ctrl_final(chan, rx_control) &&
e2ab4353 3801 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1a09bcb9 3802 __clear_monitor_timer(chan);
6a026610 3803 if (chan->unacked_frames > 0)
1a09bcb9 3804 __set_retrans_timer(chan);
e2ab4353 3805 clear_bit(CONN_WAIT_F, &chan->conn_state);
1d8f5d16
GP		 3806 }
3807
42e5c802
GP		 3808 chan->expected_ack_seq = req_seq;
3809 l2cap_drop_acked_frames(chan);
9f121a5a 3810
836be934 3811 tx_seq_offset = __seq_offset(chan, tx_seq, chan->buffer_seq);
9b53350d
JPRV		 3812
3813 /* invalid tx_seq */
47d1ec61 3814 if (tx_seq_offset >= chan->tx_win) {
8c1d787b 3815 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
9b53350d
JPRV		 3816 goto drop;
3817 }
3818
e2ab4353 3819 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1890d36b
GP		 3820 goto drop;
3821
02f1b641
MM		 3822 if (tx_seq == chan->expected_tx_seq)
3823 goto expected;
3824
e2ab4353 3825 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
8f17154f 3826 struct srej_list *first;
30afb5b2 3827
39d5a3ee 3828 first = list_first_entry(&chan->srej_l,
8f17154f
GP		 3829 struct srej_list, list);
3830 if (tx_seq == first->tx_seq) {
42e5c802 3831 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
525cd185 3832 l2cap_check_srej_gap(chan, tx_seq);
8f17154f
GP		 3833
3834 list_del(&first->list);
3835 kfree(first);
3836
39d5a3ee 3837 if (list_empty(&chan->srej_l)) {
42e5c802 3838 chan->buffer_seq = chan->buffer_seq_srej;
e2ab4353 3839 clear_bit(CONN_SREJ_SENT, &chan->conn_state);
525cd185 3840 l2cap_send_ack(chan);
49208c9c 3841 BT_DBG("chan %p, Exit SREJ_SENT", chan);
8f17154f
GP		 3842 }
3843 } else {
3844 struct srej_list *l;
9b53350d
JPRV		 3845
3846 /* duplicated tx_seq */
42e5c802 3847 if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
9b53350d 3848 goto drop;
8f17154f 3849
39d5a3ee 3850 list_for_each_entry(l, &chan->srej_l, list) {
8f17154f 3851 if (l->tx_seq == tx_seq) {
525cd185 3852 l2cap_resend_srejframe(chan, tx_seq);
8f17154f
GP		 3853 return 0;
3854 }
3855 }
525cd185 3856 l2cap_send_srejframe(chan, tx_seq);
30afb5b2
GP		 3857 }
3858 } else {
836be934
AE		 3859 expected_tx_seq_offset = __seq_offset(chan,
3860 chan->expected_tx_seq, chan->buffer_seq);
9b53350d
JPRV		 3861
3862 /* duplicated tx_seq */
3863 if (tx_seq_offset < expected_tx_seq_offset)
3864 goto drop;
3865
e2ab4353 3866 set_bit(CONN_SREJ_SENT, &chan->conn_state);
1c2acffb 3867
49208c9c 3868 BT_DBG("chan %p, Enter SREJ", chan);
0e98958d 3869
39d5a3ee 3870 INIT_LIST_HEAD(&chan->srej_l);
42e5c802 3871 chan->buffer_seq_srej = chan->buffer_seq;
8f17154f 3872
f1c6775b 3873 __skb_queue_head_init(&chan->srej_q);
42e5c802 3874 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
8f17154f 3875
e2ab4353 3876 set_bit(CONN_SEND_PBIT, &chan->conn_state);
ef54fd93 3877
525cd185 3878 l2cap_send_srejframe(chan, tx_seq);
7fe9b298 3879
1a09bcb9 3880 __clear_ack_timer(chan);
1c2acffb 3881 }
30afb5b2
GP		 3882 return 0;
3883
8f17154f 3884expected:
836be934 3885 chan->expected_tx_seq = __next_seq(chan, chan->expected_tx_seq);
8f17154f 3886
e2ab4353 3887 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3b1a9f3f
GP		 3888 bt_cb(skb)->tx_seq = tx_seq;
3889 bt_cb(skb)->sar = sar;
f1c6775b 3890 __skb_queue_tail(&chan->srej_q, skb);
8f17154f
GP		 3891 return 0;
3892 }
3893
84084a31 3894 err = l2cap_reassemble_sdu(chan, skb, rx_control);
836be934
AE		 3895 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
3896
e328140f
MM		 3897 if (err < 0) {
3898 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3899 return err;
3900 }
2ece3684 3901
03f6715d 3902 if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 3903 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 3904 l2cap_retransmit_frames(chan);
4ec10d97
GP		 3905 }
3906
1a09bcb9 3907 __set_ack_timer(chan);
c1b4f43b 3908
6a026610
GP		 3909 chan->num_acked = (chan->num_acked + 1) % num_to_ack;
3910 if (chan->num_acked == num_to_ack - 1)
525cd185 3911 l2cap_send_ack(chan);
9e917af1 3912
8f17154f 3913 return 0;
9b53350d
JPRV		 3914
3915drop:
3916 kfree_skb(skb);
3917 return 0;
1c2acffb
GP		 3918}
3919
88843ab0 3920static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u32 rx_control)
1c2acffb 3921{
88843ab0 3922 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan,
0b209fae 3923 __get_reqseq(chan, rx_control), rx_control);
0e98958d 3924
0b209fae 3925 chan->expected_ack_seq = __get_reqseq(chan, rx_control);
42e5c802 3926 l2cap_drop_acked_frames(chan);
1c2acffb 3927
e3781735 3928 if (__is_ctrl_poll(chan, rx_control)) {
e2ab4353
GP		 3929 set_bit(CONN_SEND_FBIT, &chan->conn_state);
3930 if (test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
3931 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
6a026610 3932 (chan->unacked_frames > 0))
1a09bcb9 3933 __set_retrans_timer(chan);
05fbd89d 3934
e2ab4353 3935 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
525cd185 3936 l2cap_send_srejtail(chan);
05fbd89d 3937 } else {
525cd185 3938 l2cap_send_i_or_rr_or_rnr(chan);
05fbd89d 3939 }
1d8f5d16 3940
03f6715d 3941 } else if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 3942 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
4ec10d97 3943
e2ab4353 3944 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 3945 l2cap_retransmit_frames(chan);
2246b2f1 3946
e072745f 3947 } else {
e2ab4353 3948 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
6a026610 3949 (chan->unacked_frames > 0))
1a09bcb9 3950 __set_retrans_timer(chan);
1c2acffb 3951
e2ab4353
GP		 3952 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
3953 if (test_bit(CONN_SREJ_SENT, &chan->conn_state))
525cd185 3954 l2cap_send_ack(chan);
894718a6 3955 else
525cd185 3956 l2cap_ertm_send(chan);
e072745f
GP		 3957 }
3958}
2246b2f1 3959
88843ab0 3960static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 3961{
0b209fae 3962 u16 tx_seq = __get_reqseq(chan, rx_control);
30afb5b2 3963
88843ab0 3964 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 3965
e2ab4353 3966 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
e072745f 3967
42e5c802
GP		 3968 chan->expected_ack_seq = tx_seq;
3969 l2cap_drop_acked_frames(chan);
e072745f 3970
03f6715d 3971 if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 3972 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
525cd185 3973 l2cap_retransmit_frames(chan);
e072745f 3974 } else {
525cd185 3975 l2cap_retransmit_frames(chan);
30afb5b2 3976
e2ab4353
GP		 3977 if (test_bit(CONN_WAIT_F, &chan->conn_state))
3978 set_bit(CONN_REJ_ACT, &chan->conn_state);
e072745f
GP		 3979 }
3980}
88843ab0 3981static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 3982{
0b209fae 3983 u16 tx_seq = __get_reqseq(chan, rx_control);
30afb5b2 3984
88843ab0 3985 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 3986
e2ab4353 3987 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
2246b2f1 3988
e3781735 3989 if (__is_ctrl_poll(chan, rx_control)) {
42e5c802
GP		 3990 chan->expected_ack_seq = tx_seq;
3991 l2cap_drop_acked_frames(chan);
3cb123d1 3992
e2ab4353 3993 set_bit(CONN_SEND_FBIT, &chan->conn_state);
525cd185 3994 l2cap_retransmit_one_frame(chan, tx_seq);
dfc909be 3995
525cd185 3996 l2cap_ertm_send(chan);
dfc909be 3997
e2ab4353 3998 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
6a026610 3999 chan->srej_save_reqseq = tx_seq;
e2ab4353 4000 set_bit(CONN_SREJ_ACT, &chan->conn_state);
ef54fd93 4001 }
03f6715d 4002 } else if (__is_ctrl_final(chan, rx_control)) {
e2ab4353 4003 if (test_bit(CONN_SREJ_ACT, &chan->conn_state) &&
6a026610 4004 chan->srej_save_reqseq == tx_seq)
e2ab4353 4005 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
e072745f 4006 else
525cd185 4007 l2cap_retransmit_one_frame(chan, tx_seq);
e072745f 4008 } else {
525cd185 4009 l2cap_retransmit_one_frame(chan, tx_seq);
e2ab4353 4010 if (test_bit(CONN_WAIT_F, &chan->conn_state)) {
6a026610 4011 chan->srej_save_reqseq = tx_seq;
e2ab4353 4012 set_bit(CONN_SREJ_ACT, &chan->conn_state);
ef54fd93 4013 }
e072745f
GP		 4014 }
4015}
4016
88843ab0 4017static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u32 rx_control)
e072745f 4018{
0b209fae 4019 u16 tx_seq = __get_reqseq(chan, rx_control);
e072745f 4020
88843ab0 4021 BT_DBG("chan %p, req_seq %d ctrl 0x%8.8x", chan, tx_seq, rx_control);
0e98958d 4022
e2ab4353 4023 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
42e5c802
GP		 4024 chan->expected_ack_seq = tx_seq;
4025 l2cap_drop_acked_frames(chan);
e072745f 4026
e3781735 4027 if (__is_ctrl_poll(chan, rx_control))
e2ab4353 4028 set_bit(CONN_SEND_FBIT, &chan->conn_state);
3cb123d1 4029
e2ab4353 4030 if (!test_bit(CONN_SREJ_SENT, &chan->conn_state)) {
1a09bcb9 4031 __clear_retrans_timer(chan);
e3781735 4032 if (__is_ctrl_poll(chan, rx_control))
525cd185 4033 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
99b0d4b7 4034 return;
e072745f 4035 }
99b0d4b7 4036
e3781735 4037 if (__is_ctrl_poll(chan, rx_control)) {
525cd185 4038 l2cap_send_srejtail(chan);
ab784b73
AE		 4039 } else {
4040 rx_control = __set_ctrl_super(chan, L2CAP_SUPER_RR);
4041 l2cap_send_sframe(chan, rx_control);
4042 }
e072745f
GP		 4043}
4044
88843ab0 4045static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u32 rx_control, struct sk_buff *skb)
e072745f 4046{
88843ab0 4047 BT_DBG("chan %p rx_control 0x%8.8x len %d", chan, rx_control, skb->len);
e072745f 4048
03f6715d 4049 if (__is_ctrl_final(chan, rx_control) &&
e2ab4353 4050 test_bit(CONN_WAIT_F, &chan->conn_state)) {
1a09bcb9 4051 __clear_monitor_timer(chan);
6a026610 4052 if (chan->unacked_frames > 0)
1a09bcb9 4053 __set_retrans_timer(chan);
e2ab4353 4054 clear_bit(CONN_WAIT_F, &chan->conn_state);
e072745f
GP		 4055 }
4056
ab784b73
AE		 4057 switch (__get_ctrl_super(chan, rx_control)) {
4058 case L2CAP_SUPER_RR:
525cd185 4059 l2cap_data_channel_rrframe(chan, rx_control);
8f17154f
GP		 4060 break;
4061
ab784b73 4062 case L2CAP_SUPER_REJ:
525cd185 4063 l2cap_data_channel_rejframe(chan, rx_control);
e072745f 4064 break;
2246b2f1 4065
ab784b73 4066 case L2CAP_SUPER_SREJ:
525cd185 4067 l2cap_data_channel_srejframe(chan, rx_control);
e072745f
GP		 4068 break;
4069
ab784b73 4070 case L2CAP_SUPER_RNR:
525cd185 4071 l2cap_data_channel_rnrframe(chan, rx_control);
1c2acffb
GP		 4072 break;
4073 }
4074
faaebd19 4075 kfree_skb(skb);
1c2acffb
GP		 4076 return 0;
4077}
4078
218bb9df
GP		 4079static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
4080{
525cd185 4081 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
88843ab0 4082 u32 control;
0b209fae 4083 u16 req_seq;
218bb9df
GP		 4084 int len, next_tx_seq_offset, req_seq_offset;
4085
88843ab0
AE		 4086 control = __get_control(chan, skb->data);
4087 skb_pull(skb, __ctrl_size(chan));
218bb9df
GP		 4088 len = skb->len;
4089
4090 /*
4091 * We can just drop the corrupted I-frame here.
4092 * Receiver will miss it and start proper recovery
4093 * procedures and ask retransmission.
4094 */
47d1ec61 4095 if (l2cap_check_fcs(chan, skb))
218bb9df
GP		 4096 goto drop;
4097
793c2f1c 4098 if (__is_sar_start(chan, control) && !__is_sframe(chan, control))
03a51213 4099 len -= L2CAP_SDULEN_SIZE;
218bb9df 4100
47d1ec61 4101 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 4102 len -= L2CAP_FCS_SIZE;
218bb9df 4103
47d1ec61 4104 if (len > chan->mps) {
8c1d787b 4105 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4106 goto drop;
4107 }
4108
0b209fae 4109 req_seq = __get_reqseq(chan, control);
218bb9df 4110
836be934
AE		 4111 req_seq_offset = __seq_offset(chan, req_seq, chan->expected_ack_seq);
4112
4113 next_tx_seq_offset = __seq_offset(chan, chan->next_tx_seq,
4114 chan->expected_ack_seq);
218bb9df
GP		 4115
4116 /* check for invalid req-seq */
4117 if (req_seq_offset > next_tx_seq_offset) {
8c1d787b 4118 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4119 goto drop;
4120 }
4121
793c2f1c 4122 if (!__is_sframe(chan, control)) {
218bb9df 4123 if (len < 0) {
8c1d787b 4124 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4125 goto drop;
4126 }
4127
525cd185 4128 l2cap_data_channel_iframe(chan, control, skb);
218bb9df
GP		 4129 } else {
4130 if (len != 0) {
4131 BT_ERR("%d", len);
8c1d787b 4132 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
218bb9df
GP		 4133 goto drop;
4134 }
4135
525cd185 4136 l2cap_data_channel_sframe(chan, control, skb);
218bb9df
GP		 4137 }
4138
4139 return 0;
4140
4141drop:
4142 kfree_skb(skb);
4143 return 0;
4144}
4145
1da177e4
LT		 4146static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4147{
48454079 4148 struct l2cap_chan *chan;
bf734843 4149 struct sock *sk = NULL;
88843ab0 4150 u32 control;
fb45de7d 4151 u16 tx_seq;
218bb9df 4152 int len;
1da177e4 4153
baa7e1fa 4154 chan = l2cap_get_chan_by_scid(conn, cid);
48454079 4155 if (!chan) {
1da177e4
LT		 4156 BT_DBG("unknown cid 0x%4.4x", cid);
4157 goto drop;
4158 }
4159
48454079 4160 sk = chan->sk;
6840ed07 4161
49208c9c 4162 BT_DBG("chan %p, len %d", chan, skb->len);
1da177e4 4163
89bc500e 4164 if (chan->state != BT_CONNECTED)
1da177e4
LT		 4165 goto drop;
4166
0c1bc5c6 4167 switch (chan->mode) {
1c2acffb
GP		 4168 case L2CAP_MODE_BASIC:
4169 /* If socket recv buffers overflows we drop data here
4170 * which is *bad* because L2CAP has to be reliable.
4171 * But we don't have any other choice. L2CAP doesn't
4172 * provide flow control mechanism. */
1da177e4 4173
0c1bc5c6 4174 if (chan->imtu < skb->len)
1c2acffb 4175 goto drop;
1da177e4 4176
23070494 4177 if (!chan->ops->recv(chan->data, skb))
1c2acffb
GP		 4178 goto done;
4179 break;
4180
4181 case L2CAP_MODE_ERTM:
218bb9df
GP		 4182 if (!sock_owned_by_user(sk)) {
4183 l2cap_ertm_data_rcv(sk, skb);
277ffbe3 4184 } else {
218bb9df 4185 if (sk_add_backlog(sk, skb))
277ffbe3 4186 goto drop;
277ffbe3 4187 }
1c2acffb 4188
fcafde2e 4189 goto done;
1c2acffb 4190
6840ed07 4191 case L2CAP_MODE_STREAMING:
88843ab0
AE		 4192 control = __get_control(chan, skb->data);
4193 skb_pull(skb, __ctrl_size(chan));
6840ed07
GP		 4194 len = skb->len;
4195
47d1ec61 4196 if (l2cap_check_fcs(chan, skb))
26000089
GP		 4197 goto drop;
4198
7e0ef6ee 4199 if (__is_sar_start(chan, control))
03a51213 4200 len -= L2CAP_SDULEN_SIZE;
6840ed07 4201
47d1ec61 4202 if (chan->fcs == L2CAP_FCS_CRC16)
03a51213 4203 len -= L2CAP_FCS_SIZE;
fcc203c3 4204
793c2f1c 4205 if (len > chan->mps || len < 0 || __is_sframe(chan, control))
6840ed07
GP		 4206 goto drop;
4207
fb45de7d 4208 tx_seq = __get_txseq(chan, control);
6840ed07 4209
84084a31
MM		 4210 if (chan->expected_tx_seq != tx_seq) {
4211 /* Frame(s) missing - must discard partial SDU */
4212 kfree_skb(chan->sdu);
4213 chan->sdu = NULL;
4214 chan->sdu_last_frag = NULL;
4215 chan->sdu_len = 0;
6840ed07 4216
84084a31
MM		 4217 /* TODO: Notify userland of missing data */
4218 }
4219
836be934 4220 chan->expected_tx_seq = __next_seq(chan, tx_seq);
84084a31
MM		 4221
4222 if (l2cap_reassemble_sdu(chan, skb, control) == -EMSGSIZE)
4223 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
6840ed07
GP		 4224
4225 goto done;
4226
1c2acffb 4227 default:
0c1bc5c6 4228 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
1c2acffb
GP		 4229 break;
4230 }
1da177e4
LT		 4231
4232drop:
4233 kfree_skb(skb);
4234
4235done:
0139418c
MH		 4236 if (sk)
4237 bh_unlock_sock(sk);
4238
1da177e4
LT		 4239 return 0;
4240}
4241
8e036fc3 4242static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4 4243{
6dcae1ea 4244 struct sock *sk = NULL;
23691d75 4245 struct l2cap_chan *chan;
1da177e4 4246
23691d75
GP		 4247 chan = l2cap_global_chan_by_psm(0, psm, conn->src);
4248 if (!chan)
1da177e4
LT		 4249 goto drop;
4250
23691d75
GP		 4251 sk = chan->sk;
4252
e0f0cb56
GP		 4253 bh_lock_sock(sk);
4254
1da177e4
LT		 4255 BT_DBG("sk %p, len %d", sk, skb->len);
4256
89bc500e 4257 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
1da177e4
LT		 4258 goto drop;
4259
e13e21dc 4260 if (chan->imtu < skb->len)
1da177e4
LT		 4261 goto drop;
4262
23070494 4263 if (!chan->ops->recv(chan->data, skb))
1da177e4
LT		 4264 goto done;
4265
4266drop:
4267 kfree_skb(skb);
4268
4269done:
af05b30b
GP		 4270 if (sk)
4271 bh_unlock_sock(sk);
1da177e4
LT		 4272 return 0;
4273}
4274
9f69bda6
GP		 4275static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb)
4276{
6dcae1ea 4277 struct sock *sk = NULL;
23691d75 4278 struct l2cap_chan *chan;
9f69bda6 4279
23691d75
GP		 4280 chan = l2cap_global_chan_by_scid(0, cid, conn->src);
4281 if (!chan)
9f69bda6
GP		 4282 goto drop;
4283
23691d75
GP		 4284 sk = chan->sk;
4285
9f69bda6
GP		 4286 bh_lock_sock(sk);
4287
4288 BT_DBG("sk %p, len %d", sk, skb->len);
4289
89bc500e 4290 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
9f69bda6
GP		 4291 goto drop;
4292
e13e21dc 4293 if (chan->imtu < skb->len)
9f69bda6
GP		 4294 goto drop;
4295
23070494 4296 if (!chan->ops->recv(chan->data, skb))
9f69bda6
GP		 4297 goto done;
4298
4299drop:
4300 kfree_skb(skb);
4301
4302done:
4303 if (sk)
4304 bh_unlock_sock(sk);
4305 return 0;
4306}
4307
1da177e4
LT		 4308static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4309{
4310 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4311 u16 cid, len;
4312 __le16 psm;
1da177e4
LT		 4313
4314 skb_pull(skb, L2CAP_HDR_SIZE);
4315 cid = __le16_to_cpu(lh->cid);
4316 len = __le16_to_cpu(lh->len);
4317
1c2acffb
GP		 4318 if (len != skb->len) {
4319 kfree_skb(skb);
4320 return;
4321 }
4322
1da177e4
LT		 4323 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4324
4325 switch (cid) {
3300d9a9 4326 case L2CAP_CID_LE_SIGNALING:
8db4dc46 4327 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4328 l2cap_sig_channel(conn, skb);
4329 break;
4330
8db4dc46 4331 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4332 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4333 skb_pull(skb, 2);
4334 l2cap_conless_channel(conn, psm, skb);
4335 break;
4336
9f69bda6
GP		 4337 case L2CAP_CID_LE_DATA:
4338 l2cap_att_channel(conn, cid, skb);
4339 break;
4340
b501d6a1
AB		 4341 case L2CAP_CID_SMP:
4342 if (smp_sig_channel(conn, skb))
4343 l2cap_conn_del(conn->hcon, EACCES);
4344 break;
4345
1da177e4
LT		 4346 default:
4347 l2cap_data_channel(conn, cid, skb);
4348 break;
4349 }
4350}
4351
4352/* ---- L2CAP interface with lower layer (HCI) ---- */
4353
4354static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
4355{
4356 int exact = 0, lm1 = 0, lm2 = 0;
23691d75 4357 struct l2cap_chan *c;
1da177e4
LT		 4358
4359 if (type != ACL_LINK)
963cf687 4360 return -EINVAL;
1da177e4
LT		 4361
4362 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4363
4364 /* Find listening sockets and check their link_mode */
23691d75
GP		 4365 read_lock(&chan_list_lock);
4366 list_for_each_entry(c, &chan_list, global_l) {
4367 struct sock *sk = c->sk;
4343478f 4368
89bc500e 4369 if (c->state != BT_LISTEN)
1da177e4
LT		 4370 continue;
4371
4372 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5 4373 lm1 |= HCI_LM_ACCEPT;
43bd0f32 4374 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5 4375 lm1 |= HCI_LM_MASTER;
1da177e4 4376 exact++;
2af6b9d5
MH		 4377 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4378 lm2 |= HCI_LM_ACCEPT;
43bd0f32 4379 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
2af6b9d5
MH		 4380 lm2 |= HCI_LM_MASTER;
4381 }
1da177e4 4382 }
23691d75 4383 read_unlock(&chan_list_lock);
1da177e4
LT		 4384
4385 return exact ? lm1 : lm2;
4386}
4387
4388static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
4389{
0139418c
MH		 4390 struct l2cap_conn *conn;
4391
1da177e4
LT		 4392 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4393
acd7d370 4394 if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK))
963cf687 4395 return -EINVAL;
1da177e4
LT		 4396
4397 if (!status) {
1da177e4
LT		 4398 conn = l2cap_conn_add(hcon, status);
4399 if (conn)
4400 l2cap_conn_ready(conn);
0139418c 4401 } else
e175072f 4402 l2cap_conn_del(hcon, bt_to_errno(status));
1da177e4
LT		 4403
4404 return 0;
4405}
4406
2950f21a
MH		 4407static int l2cap_disconn_ind(struct hci_conn *hcon)
4408{
4409 struct l2cap_conn *conn = hcon->l2cap_data;
4410
4411 BT_DBG("hcon %p", hcon);
4412
b5694506 4413 if ((hcon->type != ACL_LINK && hcon->type != LE_LINK) || !conn)
2950f21a
MH		 4414 return 0x13;
4415
4416 return conn->disc_reason;
4417}
4418
4419static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4420{
4421 BT_DBG("hcon %p reason %d", hcon, reason);
4422
acd7d370 4423 if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK))
963cf687 4424 return -EINVAL;
1da177e4 4425
e175072f 4426 l2cap_conn_del(hcon, bt_to_errno(reason));
0139418c 4427
1da177e4
LT		 4428 return 0;
4429}
4430
4343478f 4431static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
f62e4323 4432{
715ec005 4433 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
255c7601
MH		 4434 return;
4435
f62e4323 4436 if (encrypt == 0x00) {
4343478f 4437 if (chan->sec_level == BT_SECURITY_MEDIUM) {
c9b66675
GP		 4438 __clear_chan_timer(chan);
4439 __set_chan_timer(chan, HZ * 5);
4343478f 4440 } else if (chan->sec_level == BT_SECURITY_HIGH)
0f852724 4441 l2cap_chan_close(chan, ECONNREFUSED);
f62e4323 4442 } else {
4343478f 4443 if (chan->sec_level == BT_SECURITY_MEDIUM)
c9b66675 4444 __clear_chan_timer(chan);
f62e4323
MH		 4445 }
4446}
4447
8c1b2355 4448static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4 4449{
0139418c 4450 struct l2cap_conn *conn = hcon->l2cap_data;
48454079 4451 struct l2cap_chan *chan;
1da177e4 4452
0139418c 4453 if (!conn)
1da177e4 4454 return 0;
0139418c 4455
1da177e4
LT		 4456 BT_DBG("conn %p", conn);
4457
160dc6ac
VCG		 4458 if (hcon->type == LE_LINK) {
4459 smp_distribute_keys(conn, 0);
4460 del_timer(&conn->security_timer);
4461 }
4462
baa7e1fa 4463 read_lock(&conn->chan_lock);
1da177e4 4464
baa7e1fa 4465 list_for_each_entry(chan, &conn->chan_l, list) {
48454079 4466 struct sock *sk = chan->sk;
baa7e1fa 4467
1da177e4
LT		 4468 bh_lock_sock(sk);
4469
f1cb9af5
VCG		 4470 BT_DBG("chan->scid %d", chan->scid);
4471
4472 if (chan->scid == L2CAP_CID_LE_DATA) {
4473 if (!status && encrypt) {
4474 chan->sec_level = hcon->sec_level;
4475 l2cap_chan_ready(sk);
4476 }
4477
4478 bh_unlock_sock(sk);
4479 continue;
4480 }
4481
c1360a1c 4482 if (test_bit(CONF_CONNECT_PEND, &chan->conf_state)) {
6a8d3010
MH		 4483 bh_unlock_sock(sk);
4484 continue;
4485 }
4486
89bc500e
GP		 4487 if (!status && (chan->state == BT_CONNECTED ||
4488 chan->state == BT_CONFIG)) {
4343478f 4489 l2cap_check_encryption(chan, encrypt);
9719f8af
MH		 4490 bh_unlock_sock(sk);
4491 continue;
4492 }
4493
89bc500e 4494 if (chan->state == BT_CONNECT) {
b1235d79
MH		 4495 if (!status) {
4496 struct l2cap_conn_req req;
fe4128e0
GP		 4497 req.scid = cpu_to_le16(chan->scid);
4498 req.psm = chan->psm;
1da177e4 4499
fc7f8a7e 4500 chan->ident = l2cap_get_ident(conn);
c1360a1c 4501 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1da177e4 4502
fc7f8a7e 4503 l2cap_send_cmd(conn, chan->ident,
b1235d79
MH		 4504 L2CAP_CONN_REQ, sizeof(req), &req);
4505 } else {
c9b66675
GP		 4506 __clear_chan_timer(chan);
4507 __set_chan_timer(chan, HZ / 10);
b1235d79 4508 }
89bc500e 4509 } else if (chan->state == BT_CONNECT2) {
b1235d79 4510 struct l2cap_conn_rsp rsp;
df3c3931 4511 __u16 res, stat;
1da177e4 4512
b1235d79 4513 if (!status) {
df3c3931
JH		 4514 if (bt_sk(sk)->defer_setup) {
4515 struct sock *parent = bt_sk(sk)->parent;
4516 res = L2CAP_CR_PEND;
4517 stat = L2CAP_CS_AUTHOR_PEND;
05e9a2f6
IK		 4518 if (parent)
4519 parent->sk_data_ready(parent, 0);
df3c3931 4520 } else {
05558911 4521 l2cap_state_change(chan, BT_CONFIG);
df3c3931
JH		 4522 res = L2CAP_CR_SUCCESS;
4523 stat = L2CAP_CS_NO_INFO;
4524 }
b1235d79 4525 } else {
89bc500e 4526 l2cap_state_change(chan, BT_DISCONN);
c9b66675 4527 __set_chan_timer(chan, HZ / 10);
df3c3931
JH		 4528 res = L2CAP_CR_SEC_BLOCK;
4529 stat = L2CAP_CS_NO_INFO;
b1235d79
MH		 4530 }
4531
fe4128e0
GP		 4532 rsp.scid = cpu_to_le16(chan->dcid);
4533 rsp.dcid = cpu_to_le16(chan->scid);
df3c3931
JH		 4534 rsp.result = cpu_to_le16(res);
4535 rsp.status = cpu_to_le16(stat);
fc7f8a7e
GP		 4536 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
4537 sizeof(rsp), &rsp);
b1235d79 4538 }
1da177e4
LT		 4539
4540 bh_unlock_sock(sk);
4541 }
4542
baa7e1fa 4543 read_unlock(&conn->chan_lock);
b1235d79 4544
1da177e4
LT		 4545 return 0;
4546}
4547
4548static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4549{
4550 struct l2cap_conn *conn = hcon->l2cap_data;
4551
5a08ecce
AE		 4552 if (!conn)
4553 conn = l2cap_conn_add(hcon, 0);
4554
4555 if (!conn)
1da177e4
LT		 4556 goto drop;
4557
4558 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4559
e702112f 4560 if (!(flags & ACL_CONT)) {
1da177e4 4561 struct l2cap_hdr *hdr;
48454079 4562 struct l2cap_chan *chan;
89794813 4563 u16 cid;
1da177e4
LT		 4564 int len;
4565
4566 if (conn->rx_len) {
4567 BT_ERR("Unexpected start frame (len %d)", skb->len);
4568 kfree_skb(conn->rx_skb);
4569 conn->rx_skb = NULL;
4570 conn->rx_len = 0;
4571 l2cap_conn_unreliable(conn, ECOMM);
4572 }
4573
aae7fe22
AE		 4574 /* Start fragment always begin with Basic L2CAP header */
4575 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 4576 BT_ERR("Frame is too short (len %d)", skb->len);
4577 l2cap_conn_unreliable(conn, ECOMM);
4578 goto drop;
4579 }
4580
4581 hdr = (struct l2cap_hdr *) skb->data;
4582 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
89794813 4583 cid = __le16_to_cpu(hdr->cid);
1da177e4
LT		 4584
4585 if (len == skb->len) {
4586 /* Complete frame received */
4587 l2cap_recv_frame(conn, skb);
4588 return 0;
4589 }
4590
4591 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4592
4593 if (skb->len > len) {
4594 BT_ERR("Frame is too long (len %d, expected len %d)",
4595 skb->len, len);
4596 l2cap_conn_unreliable(conn, ECOMM);
4597 goto drop;
4598 }
4599
baa7e1fa 4600 chan = l2cap_get_chan_by_scid(conn, cid);
89794813 4601
48454079
GP		 4602 if (chan && chan->sk) {
4603 struct sock *sk = chan->sk;
89794813 4604
0c1bc5c6 4605 if (chan->imtu < len - L2CAP_HDR_SIZE) {
48454079
GP		 4606 BT_ERR("Frame exceeding recv MTU (len %d, "
4607 "MTU %d)", len,
0c1bc5c6 4608 chan->imtu);
48454079
GP		 4609 bh_unlock_sock(sk);
4610 l2cap_conn_unreliable(conn, ECOMM);
4611 goto drop;
4612 }
89794813 4613 bh_unlock_sock(sk);
48454079 4614 }
89794813 4615
1da177e4 4616 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4617 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4618 if (!conn->rx_skb)
1da177e4
LT		 4619 goto drop;
4620
d626f62b 4621 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4622 skb->len);
1da177e4
LT		 4623 conn->rx_len = len - skb->len;
4624 } else {
4625 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4626
4627 if (!conn->rx_len) {
4628 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4629 l2cap_conn_unreliable(conn, ECOMM);
4630 goto drop;
4631 }
4632
4633 if (skb->len > conn->rx_len) {
4634 BT_ERR("Fragment is too long (len %d, expected %d)",
4635 skb->len, conn->rx_len);
4636 kfree_skb(conn->rx_skb);
4637 conn->rx_skb = NULL;
4638 conn->rx_len = 0;
4639 l2cap_conn_unreliable(conn, ECOMM);
4640 goto drop;
4641 }
4642
d626f62b 4643 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4644 skb->len);
1da177e4
LT		 4645 conn->rx_len -= skb->len;
4646
4647 if (!conn->rx_len) {
4648 /* Complete frame received */
4649 l2cap_recv_frame(conn, conn->rx_skb);
4650 conn->rx_skb = NULL;
4651 }
4652 }
4653
4654drop:
4655 kfree_skb(skb);
4656 return 0;
4657}
4658
aef7d97c 4659static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4 4660{
23691d75 4661 struct l2cap_chan *c;
1da177e4 4662
23691d75 4663 read_lock_bh(&chan_list_lock);
1da177e4 4664
23691d75
GP		 4665 list_for_each_entry(c, &chan_list, global_l) {
4666 struct sock *sk = c->sk;
101545f6 4667
903d343e 4668 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
aef7d97c
MH		 4669 batostr(&bt_sk(sk)->src),
4670 batostr(&bt_sk(sk)->dst),
89bc500e 4671 c->state, __le16_to_cpu(c->psm),
23691d75
GP		 4672 c->scid, c->dcid, c->imtu, c->omtu,
4673 c->sec_level, c->mode);
05558911 4674}
1da177e4 4675
23691d75 4676 read_unlock_bh(&chan_list_lock);
1da177e4 4677
aef7d97c 4678 return 0;
1da177e4
LT		 4679}
4680
aef7d97c
MH		 4681static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4682{
4683 return single_open(file, l2cap_debugfs_show, inode->i_private);
4684}
4685
4686static const struct file_operations l2cap_debugfs_fops = {
4687 .open = l2cap_debugfs_open,
4688 .read = seq_read,
4689 .llseek = seq_lseek,
4690 .release = single_release,
4691};
4692
4693static struct dentry *l2cap_debugfs;
1da177e4 4694
1da177e4
LT		 4695static struct hci_proto l2cap_hci_proto = {
4696 .name = "L2CAP",
4697 .id = HCI_PROTO_L2CAP,
4698 .connect_ind = l2cap_connect_ind,
4699 .connect_cfm = l2cap_connect_cfm,
4700 .disconn_ind = l2cap_disconn_ind,
2950f21a 4701 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4702 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4703 .recv_acldata = l2cap_recv_acldata
4704};
4705
64274518 4706int __init l2cap_init(void)
1da177e4
LT		 4707{
4708 int err;
be9d1227 4709
bb58f747 4710 err = l2cap_init_sockets();
1da177e4
LT		 4711 if (err < 0)
4712 return err;
4713
1da177e4
LT		 4714 err = hci_register_proto(&l2cap_hci_proto);
4715 if (err < 0) {
4716 BT_ERR("L2CAP protocol registration failed");
4717 bt_sock_unregister(BTPROTO_L2CAP);
4718 goto error;
4719 }
4720
aef7d97c
MH		 4721 if (bt_debugfs) {
4722 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4723 bt_debugfs, NULL, &l2cap_debugfs_fops);
4724 if (!l2cap_debugfs)
4725 BT_ERR("Failed to create L2CAP debug file");
4726 }
1da177e4 4727
1da177e4
LT		 4728 return 0;
4729
4730error:
bb58f747 4731 l2cap_cleanup_sockets();
1da177e4
LT		 4732 return err;
4733}
4734
64274518 4735void l2cap_exit(void)
1da177e4 4736{
aef7d97c 4737 debugfs_remove(l2cap_debugfs);
1da177e4 4738
1da177e4
LT		 4739 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4740 BT_ERR("L2CAP protocol unregistration failed");
4741
bb58f747 4742 l2cap_cleanup_sockets();
1da177e4
LT		 4743}
4744
d1c4a17d
GP		 4745module_param(disable_ertm, bool, 0644);
4746MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
a5fd6f30
AE		 4747
4748module_param(enable_hs, bool, 0644);
4749MODULE_PARM_DESC(enable_hs, "Enable High Speed");
kernel source for telekom puls (alcatel/mediatek)