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Bluetooth: Fix typo in hci_event.c
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / l2cap.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
27/* Bluetooth L2CAP core and sockets. */
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>
57
dd135240 58#define VERSION "2.15"
44dd46de
MH		 59
60static int enable_ertm = 0;
f0709e03 61
47ec1dcd 62static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
e1027a7c 63static u8 l2cap_fixed_chan[8] = { 0x02, };
1da177e4 64
90ddc4f0 65static const struct proto_ops l2cap_sock_ops;
1da177e4 66
1890d36b
GP		 67static struct workqueue_struct *_busy_wq;
68
1da177e4 69static struct bt_sock_list l2cap_sk_list = {
d5fb2962 70 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
1da177e4
LT		 71};
72
1890d36b
GP		 73static void l2cap_busy_work(struct work_struct *work);
74
1da177e4
LT		 75static void __l2cap_sock_close(struct sock *sk, int reason);
76static void l2cap_sock_close(struct sock *sk);
77static void l2cap_sock_kill(struct sock *sk);
78
e9aeb2dd 79static int l2cap_build_conf_req(struct sock *sk, void *data);
1da177e4
LT		 80static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
81 u8 code, u8 ident, u16 dlen, void *data);
82
218bb9df
GP		 83static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
84
1da177e4
LT		 85/* ---- L2CAP timers ---- */
86static void l2cap_sock_timeout(unsigned long arg)
87{
88 struct sock *sk = (struct sock *) arg;
b1235d79 89 int reason;
1da177e4
LT		 90
91 BT_DBG("sock %p state %d", sk, sk->sk_state);
92
93 bh_lock_sock(sk);
b1235d79 94
f62e4323
MH		 95 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
96 reason = ECONNREFUSED;
97 else if (sk->sk_state == BT_CONNECT &&
2af6b9d5 98 l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
b1235d79
MH		 99 reason = ECONNREFUSED;
100 else
101 reason = ETIMEDOUT;
102
103 __l2cap_sock_close(sk, reason);
104
1da177e4
LT		 105 bh_unlock_sock(sk);
106
107 l2cap_sock_kill(sk);
108 sock_put(sk);
109}
110
111static void l2cap_sock_set_timer(struct sock *sk, long timeout)
112{
113 BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
114 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
115}
116
117static void l2cap_sock_clear_timer(struct sock *sk)
118{
119 BT_DBG("sock %p state %d", sk, sk->sk_state);
120 sk_stop_timer(sk, &sk->sk_timer);
121}
122
0139418c
MH		 123/* ---- L2CAP channels ---- */
124static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
125{
126 struct sock *s;
127 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
128 if (l2cap_pi(s)->dcid == cid)
129 break;
130 }
131 return s;
132}
133
134static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
135{
136 struct sock *s;
137 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
138 if (l2cap_pi(s)->scid == cid)
139 break;
140 }
141 return s;
142}
143
144/* Find channel with given SCID.
145 * Returns locked socket */
146static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
147{
148 struct sock *s;
149 read_lock(&l->lock);
150 s = __l2cap_get_chan_by_scid(l, cid);
af05b30b
GP		 151 if (s)
152 bh_lock_sock(s);
0139418c
MH		 153 read_unlock(&l->lock);
154 return s;
155}
156
157static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
158{
159 struct sock *s;
160 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
161 if (l2cap_pi(s)->ident == ident)
162 break;
163 }
164 return s;
165}
166
167static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
168{
169 struct sock *s;
170 read_lock(&l->lock);
171 s = __l2cap_get_chan_by_ident(l, ident);
af05b30b
GP		 172 if (s)
173 bh_lock_sock(s);
0139418c
MH		 174 read_unlock(&l->lock);
175 return s;
176}
177
178static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
179{
8db4dc46 180 u16 cid = L2CAP_CID_DYN_START;
0139418c 181
8db4dc46 182 for (; cid < L2CAP_CID_DYN_END; cid++) {
af05b30b 183 if (!__l2cap_get_chan_by_scid(l, cid))
0139418c
MH		 184 return cid;
185 }
186
187 return 0;
188}
189
190static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
191{
192 sock_hold(sk);
193
194 if (l->head)
195 l2cap_pi(l->head)->prev_c = sk;
196
197 l2cap_pi(sk)->next_c = l->head;
198 l2cap_pi(sk)->prev_c = NULL;
199 l->head = sk;
200}
201
202static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
203{
204 struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
205
fd1278d7 206 write_lock_bh(&l->lock);
0139418c
MH		 207 if (sk == l->head)
208 l->head = next;
209
210 if (next)
211 l2cap_pi(next)->prev_c = prev;
212 if (prev)
213 l2cap_pi(prev)->next_c = next;
fd1278d7 214 write_unlock_bh(&l->lock);
0139418c
MH		 215
216 __sock_put(sk);
217}
218
219static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
220{
221 struct l2cap_chan_list *l = &conn->chan_list;
222
af05b30b
GP		 223 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
224 l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
0139418c 225
2950f21a
MH		 226 conn->disc_reason = 0x13;
227
0139418c
MH		 228 l2cap_pi(sk)->conn = conn;
229
bd3c9e25 230 if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) {
0139418c
MH		 231 /* Alloc CID for connection-oriented socket */
232 l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
233 } else if (sk->sk_type == SOCK_DGRAM) {
234 /* Connectionless socket */
8db4dc46
GP		 235 l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
236 l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
0139418c
MH		 237 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
238 } else {
239 /* Raw socket can send/recv signalling messages only */
8db4dc46
GP		 240 l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
241 l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
0139418c
MH		 242 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
243 }
244
245 __l2cap_chan_link(l, sk);
246
247 if (parent)
248 bt_accept_enqueue(parent, sk);
249}
250
8e87d142 251/* Delete channel.
0139418c
MH		 252 * Must be called on the locked socket. */
253static void l2cap_chan_del(struct sock *sk, int err)
254{
255 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
256 struct sock *parent = bt_sk(sk)->parent;
257
258 l2cap_sock_clear_timer(sk);
259
260 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
261
8e87d142 262 if (conn) {
0139418c
MH		 263 /* Unlink from channel list */
264 l2cap_chan_unlink(&conn->chan_list, sk);
265 l2cap_pi(sk)->conn = NULL;
266 hci_conn_put(conn->hcon);
267 }
268
b1235d79 269 sk->sk_state = BT_CLOSED;
0139418c
MH		 270 sock_set_flag(sk, SOCK_ZAPPED);
271
272 if (err)
273 sk->sk_err = err;
274
275 if (parent) {
276 bt_accept_unlink(sk);
277 parent->sk_data_ready(parent, 0);
278 } else
279 sk->sk_state_change(sk);
c13ffa62
GP		 280
281 skb_queue_purge(TX_QUEUE(sk));
282
283 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
284 struct srej_list *l, *tmp;
285
286 del_timer(&l2cap_pi(sk)->retrans_timer);
287 del_timer(&l2cap_pi(sk)->monitor_timer);
288 del_timer(&l2cap_pi(sk)->ack_timer);
289
290 skb_queue_purge(SREJ_QUEUE(sk));
291 skb_queue_purge(BUSY_QUEUE(sk));
292
293 list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
294 list_del(&l->list);
295 kfree(l);
296 }
297 }
0139418c
MH		 298}
299
79d554a6 300/* Service level security */
2af6b9d5 301static inline int l2cap_check_security(struct sock *sk)
79d554a6
MH		 302{
303 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
0684e5f9
MH		 304 __u8 auth_type;
305
00ae4af9
MH		 306 if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
307 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
308 auth_type = HCI_AT_NO_BONDING_MITM;
309 else
af05b30b 310 auth_type = HCI_AT_NO_BONDING;
00ae4af9
MH		 311
312 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
313 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
314 } else {
315 switch (l2cap_pi(sk)->sec_level) {
316 case BT_SECURITY_HIGH:
317 auth_type = HCI_AT_GENERAL_BONDING_MITM;
318 break;
319 case BT_SECURITY_MEDIUM:
320 auth_type = HCI_AT_GENERAL_BONDING;
321 break;
322 default:
323 auth_type = HCI_AT_NO_BONDING;
324 break;
325 }
0684e5f9 326 }
79d554a6 327
0684e5f9
MH		 328 return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
329 auth_type);
79d554a6
MH		 330}
331
4e8402a3
MH		 332static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
333{
334 u8 id;
335
336 /* Get next available identificator.
337 * 1 - 128 are used by kernel.
338 * 129 - 199 are reserved.
339 * 200 - 254 are used by utilities like l2ping, etc.
340 */
341
342 spin_lock_bh(&conn->lock);
343
344 if (++conn->tx_ident > 128)
345 conn->tx_ident = 1;
346
347 id = conn->tx_ident;
348
349 spin_unlock_bh(&conn->lock);
350
351 return id;
352}
353
9a9c6a34 354static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 355{
356 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
357
358 BT_DBG("code 0x%2.2x", code);
359
360 if (!skb)
9a9c6a34 361 return;
4e8402a3 362
9a9c6a34 363 hci_send_acl(conn->hcon, skb, 0);
4e8402a3
MH		 364}
365
9a9c6a34 366static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
1c2acffb
GP		 367{
368 struct sk_buff *skb;
369 struct l2cap_hdr *lh;
370 struct l2cap_conn *conn = pi->conn;
c13ffa62 371 struct sock *sk = (struct sock *)pi;
fcc203c3
GP		 372 int count, hlen = L2CAP_HDR_SIZE + 2;
373
c13ffa62
GP		 374 if (sk->sk_state != BT_CONNECTED)
375 return;
376
fcc203c3
GP		 377 if (pi->fcs == L2CAP_FCS_CRC16)
378 hlen += 2;
1c2acffb
GP		 379
380 BT_DBG("pi %p, control 0x%2.2x", pi, control);
381
fcc203c3 382 count = min_t(unsigned int, conn->mtu, hlen);
1c2acffb
GP		 383 control |= L2CAP_CTRL_FRAME_TYPE;
384
9e917af1
GP		 385 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
386 control |= L2CAP_CTRL_FINAL;
387 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
388 }
389
f0946ccf
GP		 390 if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
391 control |= L2CAP_CTRL_POLL;
392 pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
393 }
394
1c2acffb
GP		 395 skb = bt_skb_alloc(count, GFP_ATOMIC);
396 if (!skb)
9a9c6a34 397 return;
1c2acffb
GP		 398
399 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fcc203c3 400 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1c2acffb
GP		 401 lh->cid = cpu_to_le16(pi->dcid);
402 put_unaligned_le16(control, skb_put(skb, 2));
403
fcc203c3
GP		 404 if (pi->fcs == L2CAP_FCS_CRC16) {
405 u16 fcs = crc16(0, (u8 *)lh, count - 2);
406 put_unaligned_le16(fcs, skb_put(skb, 2));
407 }
408
9a9c6a34 409 hci_send_acl(pi->conn->hcon, skb, 0);
1c2acffb
GP		 410}
411
9a9c6a34 412static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
7e743090 413{
1890d36b 414 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
7e743090 415 control |= L2CAP_SUPER_RCV_NOT_READY;
1890d36b
GP		 416 pi->conn_state |= L2CAP_CONN_RNR_SENT;
417 } else
7e743090
GP		 418 control |= L2CAP_SUPER_RCV_READY;
419
2ab25cdd
GP		 420 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
421
9a9c6a34 422 l2cap_send_sframe(pi, control);
7e743090
GP		 423}
424
e501d055
AE		 425static inline int __l2cap_no_conn_pending(struct sock *sk)
426{
427 return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND);
428}
429
79d554a6
MH		 430static void l2cap_do_start(struct sock *sk)
431{
432 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
433
434 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 435 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
436 return;
437
e501d055 438 if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) {
b1235d79
MH		 439 struct l2cap_conn_req req;
440 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
441 req.psm = l2cap_pi(sk)->psm;
79d554a6 442
b1235d79 443 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
e501d055 444 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
79d554a6 445
b1235d79 446 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
79d554a6 447 L2CAP_CONN_REQ, sizeof(req), &req);
b1235d79 448 }
79d554a6
MH		 449 } else {
450 struct l2cap_info_req req;
451 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
452
453 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
454 conn->info_ident = l2cap_get_ident(conn);
455
456 mod_timer(&conn->info_timer, jiffies +
457 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
458
459 l2cap_send_cmd(conn, conn->info_ident,
460 L2CAP_INFO_REQ, sizeof(req), &req);
461 }
462}
463
cf6c2c0b
GP		 464static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
465{
466 u32 local_feat_mask = l2cap_feat_mask;
467 if (enable_ertm)
468 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
469
470 switch (mode) {
471 case L2CAP_MODE_ERTM:
472 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
473 case L2CAP_MODE_STREAMING:
474 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
475 default:
476 return 0x00;
477 }
478}
479
9b108fc0 480static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err)
22121fc9
GP		 481{
482 struct l2cap_disconn_req req;
483
c13ffa62
GP		 484 if (!conn)
485 return;
486
487 skb_queue_purge(TX_QUEUE(sk));
488
489 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
490 del_timer(&l2cap_pi(sk)->retrans_timer);
491 del_timer(&l2cap_pi(sk)->monitor_timer);
492 del_timer(&l2cap_pi(sk)->ack_timer);
493 }
494
22121fc9
GP		 495 req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
496 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
497 l2cap_send_cmd(conn, l2cap_get_ident(conn),
498 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62
GP		 499
500 sk->sk_state = BT_DISCONN;
9b108fc0 501 sk->sk_err = err;
22121fc9
GP		 502}
503
1da177e4 504/* ---- L2CAP connections ---- */
4e8402a3
MH		 505static void l2cap_conn_start(struct l2cap_conn *conn)
506{
507 struct l2cap_chan_list *l = &conn->chan_list;
cf6c2c0b 508 struct sock_del_list del, *tmp1, *tmp2;
4e8402a3
MH		 509 struct sock *sk;
510
511 BT_DBG("conn %p", conn);
512
cf6c2c0b
GP		 513 INIT_LIST_HEAD(&del.list);
514
4e8402a3
MH		 515 read_lock(&l->lock);
516
517 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
518 bh_lock_sock(sk);
519
bd3c9e25
GP		 520 if (sk->sk_type != SOCK_SEQPACKET &&
521 sk->sk_type != SOCK_STREAM) {
79d554a6
MH		 522 bh_unlock_sock(sk);
523 continue;
524 }
525
526 if (sk->sk_state == BT_CONNECT) {
47731de7 527 struct l2cap_conn_req req;
79d554a6 528
47731de7
GP		 529 if (!l2cap_check_security(sk) ||
530 !__l2cap_no_conn_pending(sk)) {
531 bh_unlock_sock(sk);
532 continue;
533 }
79d554a6 534
47731de7
GP		 535 if (!l2cap_mode_supported(l2cap_pi(sk)->mode,
536 conn->feat_mask)
537 && l2cap_pi(sk)->conf_state &
538 L2CAP_CONF_STATE2_DEVICE) {
539 tmp1 = kzalloc(sizeof(struct sock_del_list),
540 GFP_ATOMIC);
541 tmp1->sk = sk;
542 list_add_tail(&tmp1->list, &del.list);
543 bh_unlock_sock(sk);
544 continue;
b1235d79 545 }
47731de7
GP		 546
547 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
548 req.psm = l2cap_pi(sk)->psm;
549
550 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
551 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
552
553 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
554 L2CAP_CONN_REQ, sizeof(req), &req);
555
79d554a6
MH		 556 } else if (sk->sk_state == BT_CONNECT2) {
557 struct l2cap_conn_rsp rsp;
e9aeb2dd 558 char buf[128];
79d554a6
MH		 559 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
560 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
561
2af6b9d5 562 if (l2cap_check_security(sk)) {
f66dc81f
MH		 563 if (bt_sk(sk)->defer_setup) {
564 struct sock *parent = bt_sk(sk)->parent;
565 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
566 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
567 parent->sk_data_ready(parent, 0);
568
569 } else {
570 sk->sk_state = BT_CONFIG;
571 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
572 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
573 }
79d554a6
MH		 574 } else {
575 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
576 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
577 }
578
579 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
580 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
e9aeb2dd
GP		 581
582 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT ||
583 rsp.result != L2CAP_CR_SUCCESS) {
584 bh_unlock_sock(sk);
585 continue;
586 }
587
588 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
589 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
590 l2cap_build_conf_req(sk, buf), buf);
591 l2cap_pi(sk)->num_conf_req++;
4e8402a3
MH		 592 }
593
594 bh_unlock_sock(sk);
595 }
596
597 read_unlock(&l->lock);
cf6c2c0b
GP		 598
599 list_for_each_entry_safe(tmp1, tmp2, &del.list, list) {
600 bh_lock_sock(tmp1->sk);
601 __l2cap_sock_close(tmp1->sk, ECONNRESET);
602 bh_unlock_sock(tmp1->sk);
603 list_del(&tmp1->list);
604 kfree(tmp1);
605 }
4e8402a3
MH		 606}
607
608static void l2cap_conn_ready(struct l2cap_conn *conn)
609{
79d554a6
MH		 610 struct l2cap_chan_list *l = &conn->chan_list;
611 struct sock *sk;
4e8402a3 612
79d554a6 613 BT_DBG("conn %p", conn);
4e8402a3 614
79d554a6 615 read_lock(&l->lock);
4e8402a3 616
79d554a6
MH		 617 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
618 bh_lock_sock(sk);
4e8402a3 619
bd3c9e25
GP		 620 if (sk->sk_type != SOCK_SEQPACKET &&
621 sk->sk_type != SOCK_STREAM) {
79d554a6
MH		 622 l2cap_sock_clear_timer(sk);
623 sk->sk_state = BT_CONNECTED;
624 sk->sk_state_change(sk);
625 } else if (sk->sk_state == BT_CONNECT)
626 l2cap_do_start(sk);
4e8402a3 627
79d554a6 628 bh_unlock_sock(sk);
4e8402a3 629 }
79d554a6
MH		 630
631 read_unlock(&l->lock);
4e8402a3
MH		 632}
633
634/* Notify sockets that we cannot guaranty reliability anymore */
635static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
636{
637 struct l2cap_chan_list *l = &conn->chan_list;
638 struct sock *sk;
639
640 BT_DBG("conn %p", conn);
641
642 read_lock(&l->lock);
643
644 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2af6b9d5 645 if (l2cap_pi(sk)->force_reliable)
4e8402a3
MH		 646 sk->sk_err = err;
647 }
648
649 read_unlock(&l->lock);
650}
651
652static void l2cap_info_timeout(unsigned long arg)
653{
654 struct l2cap_conn *conn = (void *) arg;
655
984947dc 656 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 657 conn->info_ident = 0;
984947dc 658
4e8402a3
MH		 659 l2cap_conn_start(conn);
660}
661
1da177e4
LT		 662static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
663{
0139418c 664 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 665
0139418c 666 if (conn || status)
1da177e4
LT		 667 return conn;
668
0139418c
MH		 669 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
670 if (!conn)
1da177e4 671 return NULL;
1da177e4
LT		 672
673 hcon->l2cap_data = conn;
674 conn->hcon = hcon;
675
0139418c
MH		 676 BT_DBG("hcon %p conn %p", hcon, conn);
677
1da177e4
LT		 678 conn->mtu = hcon->hdev->acl_mtu;
679 conn->src = &hcon->hdev->bdaddr;
680 conn->dst = &hcon->dst;
681
4e8402a3
MH		 682 conn->feat_mask = 0;
683
1da177e4
LT		 684 spin_lock_init(&conn->lock);
685 rwlock_init(&conn->chan_list.lock);
686
45054dc1
DY		 687 setup_timer(&conn->info_timer, l2cap_info_timeout,
688 (unsigned long) conn);
689
2950f21a
MH		 690 conn->disc_reason = 0x13;
691
1da177e4
LT		 692 return conn;
693}
694
0139418c 695static void l2cap_conn_del(struct hci_conn *hcon, int err)
1da177e4 696{
0139418c 697 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4
LT		 698 struct sock *sk;
699
0139418c
MH		 700 if (!conn)
701 return;
1da177e4
LT		 702
703 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
704
7585b97a 705 kfree_skb(conn->rx_skb);
1da177e4
LT		 706
707 /* Kill channels */
708 while ((sk = conn->chan_list.head)) {
709 bh_lock_sock(sk);
710 l2cap_chan_del(sk, err);
711 bh_unlock_sock(sk);
712 l2cap_sock_kill(sk);
713 }
714
8e8440f5
DY		 715 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
716 del_timer_sync(&conn->info_timer);
3ab22731 717
1da177e4
LT		 718 hcon->l2cap_data = NULL;
719 kfree(conn);
1da177e4
LT		 720}
721
722static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
723{
724 struct l2cap_chan_list *l = &conn->chan_list;
fd1278d7 725 write_lock_bh(&l->lock);
1da177e4 726 __l2cap_chan_add(conn, sk, parent);
fd1278d7 727 write_unlock_bh(&l->lock);
1da177e4
LT		 728}
729
1da177e4 730/* ---- Socket interface ---- */
8e036fc3 731static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
1da177e4
LT		 732{
733 struct sock *sk;
734 struct hlist_node *node;
735 sk_for_each(sk, node, &l2cap_sk_list.head)
736 if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
737 goto found;
738 sk = NULL;
739found:
740 return sk;
741}
742
743/* Find socket with psm and source bdaddr.
744 * Returns closest match.
745 */
8e036fc3 746static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4
LT		 747{
748 struct sock *sk = NULL, *sk1 = NULL;
749 struct hlist_node *node;
750
751 sk_for_each(sk, node, &l2cap_sk_list.head) {
752 if (state && sk->sk_state != state)
753 continue;
754
755 if (l2cap_pi(sk)->psm == psm) {
756 /* Exact match. */
757 if (!bacmp(&bt_sk(sk)->src, src))
758 break;
759
760 /* Closest match */
761 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
762 sk1 = sk;
763 }
764 }
765 return node ? sk : sk1;
766}
767
768/* Find socket with given address (psm, src).
769 * Returns locked socket */
8e036fc3 770static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4
LT		 771{
772 struct sock *s;
773 read_lock(&l2cap_sk_list.lock);
774 s = __l2cap_get_sock_by_psm(state, psm, src);
af05b30b
GP		 775 if (s)
776 bh_lock_sock(s);
1da177e4
LT		 777 read_unlock(&l2cap_sk_list.lock);
778 return s;
779}
780
781static void l2cap_sock_destruct(struct sock *sk)
782{
783 BT_DBG("sk %p", sk);
784
785 skb_queue_purge(&sk->sk_receive_queue);
786 skb_queue_purge(&sk->sk_write_queue);
787}
788
789static void l2cap_sock_cleanup_listen(struct sock *parent)
790{
791 struct sock *sk;
792
793 BT_DBG("parent %p", parent);
794
795 /* Close not yet accepted channels */
796 while ((sk = bt_accept_dequeue(parent, NULL)))
797 l2cap_sock_close(sk);
798
b1235d79 799 parent->sk_state = BT_CLOSED;
1da177e4
LT		 800 sock_set_flag(parent, SOCK_ZAPPED);
801}
802
803/* Kill socket (only if zapped and orphan)
804 * Must be called on unlocked socket.
805 */
806static void l2cap_sock_kill(struct sock *sk)
807{
808 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
809 return;
810
811 BT_DBG("sk %p state %d", sk, sk->sk_state);
812
813 /* Kill poor orphan */
814 bt_sock_unlink(&l2cap_sk_list, sk);
815 sock_set_flag(sk, SOCK_DEAD);
816 sock_put(sk);
817}
818
819static void __l2cap_sock_close(struct sock *sk, int reason)
820{
821 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
822
823 switch (sk->sk_state) {
824 case BT_LISTEN:
825 l2cap_sock_cleanup_listen(sk);
826 break;
827
828 case BT_CONNECTED:
829 case BT_CONFIG:
bd3c9e25
GP		 830 if (sk->sk_type == SOCK_SEQPACKET ||
831 sk->sk_type == SOCK_STREAM) {
1da177e4 832 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1da177e4 833
1da177e4 834 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
9b108fc0 835 l2cap_send_disconn_req(conn, sk, reason);
b1235d79 836 } else
1da177e4 837 l2cap_chan_del(sk, reason);
1da177e4
LT		 838 break;
839
f66dc81f 840 case BT_CONNECT2:
bd3c9e25
GP		 841 if (sk->sk_type == SOCK_SEQPACKET ||
842 sk->sk_type == SOCK_STREAM) {
f66dc81f
MH		 843 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
844 struct l2cap_conn_rsp rsp;
845 __u16 result;
846
847 if (bt_sk(sk)->defer_setup)
848 result = L2CAP_CR_SEC_BLOCK;
849 else
850 result = L2CAP_CR_BAD_PSM;
851
852 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
853 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
854 rsp.result = cpu_to_le16(result);
855 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
856 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
857 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
858 } else
859 l2cap_chan_del(sk, reason);
860 break;
861
1da177e4
LT		 862 case BT_CONNECT:
863 case BT_DISCONN:
864 l2cap_chan_del(sk, reason);
865 break;
866
867 default:
868 sock_set_flag(sk, SOCK_ZAPPED);
869 break;
870 }
871}
872
873/* Must be called on unlocked socket. */
874static void l2cap_sock_close(struct sock *sk)
875{
876 l2cap_sock_clear_timer(sk);
877 lock_sock(sk);
878 __l2cap_sock_close(sk, ECONNRESET);
879 release_sock(sk);
880 l2cap_sock_kill(sk);
881}
882
883static void l2cap_sock_init(struct sock *sk, struct sock *parent)
884{
885 struct l2cap_pinfo *pi = l2cap_pi(sk);
886
887 BT_DBG("sk %p", sk);
888
889 if (parent) {
890 sk->sk_type = parent->sk_type;
f66dc81f
MH		 891 bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
892
1da177e4
LT		 893 pi->imtu = l2cap_pi(parent)->imtu;
894 pi->omtu = l2cap_pi(parent)->omtu;
85eb53c6 895 pi->conf_state = l2cap_pi(parent)->conf_state;
c6b03cf9
MH		 896 pi->mode = l2cap_pi(parent)->mode;
897 pi->fcs = l2cap_pi(parent)->fcs;
68d7f0ce 898 pi->max_tx = l2cap_pi(parent)->max_tx;
14b5aa71 899 pi->tx_win = l2cap_pi(parent)->tx_win;
2af6b9d5
MH		 900 pi->sec_level = l2cap_pi(parent)->sec_level;
901 pi->role_switch = l2cap_pi(parent)->role_switch;
902 pi->force_reliable = l2cap_pi(parent)->force_reliable;
1da177e4
LT		 903 } else {
904 pi->imtu = L2CAP_DEFAULT_MTU;
905 pi->omtu = 0;
85eb53c6 906 if (enable_ertm && sk->sk_type == SOCK_STREAM) {
bd3c9e25 907 pi->mode = L2CAP_MODE_ERTM;
85eb53c6
GP		 908 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
909 } else {
bd3c9e25 910 pi->mode = L2CAP_MODE_BASIC;
85eb53c6 911 }
fd059b9b 912 pi->max_tx = L2CAP_DEFAULT_MAX_TX;
c6b03cf9 913 pi->fcs = L2CAP_FCS_CRC16;
fd059b9b 914 pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
2af6b9d5
MH		 915 pi->sec_level = BT_SECURITY_LOW;
916 pi->role_switch = 0;
917 pi->force_reliable = 0;
1da177e4
LT		 918 }
919
920 /* Default config options */
5dee9e7c 921 pi->conf_len = 0;
1da177e4 922 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
45054dc1
DY		 923 skb_queue_head_init(TX_QUEUE(sk));
924 skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b 925 skb_queue_head_init(BUSY_QUEUE(sk));
45054dc1 926 INIT_LIST_HEAD(SREJ_LIST(sk));
1da177e4
LT		 927}
928
929static struct proto l2cap_proto = {
930 .name = "L2CAP",
931 .owner = THIS_MODULE,
932 .obj_size = sizeof(struct l2cap_pinfo)
933};
934
1b8d7ae4 935static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
1da177e4
LT		 936{
937 struct sock *sk;
938
6257ff21 939 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
1da177e4
LT		 940 if (!sk)
941 return NULL;
942
943 sock_init_data(sock, sk);
944 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
945
946 sk->sk_destruct = l2cap_sock_destruct;
4e8402a3 947 sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
1da177e4
LT		 948
949 sock_reset_flag(sk, SOCK_ZAPPED);
950
951 sk->sk_protocol = proto;
b1235d79 952 sk->sk_state = BT_OPEN;
1da177e4 953
b1235d79 954 setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
1da177e4
LT		 955
956 bt_sock_link(&l2cap_sk_list, sk);
957 return sk;
958}
959
3f378b68
EP		 960static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
961 int kern)
1da177e4
LT		 962{
963 struct sock *sk;
964
965 BT_DBG("sock %p", sock);
966
967 sock->state = SS_UNCONNECTED;
968
bd3c9e25 969 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1da177e4
LT		 970 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
971 return -ESOCKTNOSUPPORT;
972
c84b3268 973 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1da177e4
LT		 974 return -EPERM;
975
976 sock->ops = &l2cap_sock_ops;
977
1b8d7ae4 978 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1da177e4
LT		 979 if (!sk)
980 return -ENOMEM;
981
982 l2cap_sock_init(sk, NULL);
983 return 0;
984}
985
f29972de 986static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
1da177e4 987{
1da177e4 988 struct sock *sk = sock->sk;
f29972de
MH		 989 struct sockaddr_l2 la;
990 int len, err = 0;
1da177e4 991
f29972de 992 BT_DBG("sk %p", sk);
1da177e4
LT		 993
994 if (!addr || addr->sa_family != AF_BLUETOOTH)
995 return -EINVAL;
996
f29972de
MH		 997 memset(&la, 0, sizeof(la));
998 len = min_t(unsigned int, sizeof(la), alen);
999 memcpy(&la, addr, len);
1000
2a517ca6
MH		 1001 if (la.l2_cid)
1002 return -EINVAL;
1003
1da177e4
LT		 1004 lock_sock(sk);
1005
1006 if (sk->sk_state != BT_OPEN) {
1007 err = -EBADFD;
1008 goto done;
1009 }
1010
b4324b5d 1011 if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 &&
847641d7
MH		 1012 !capable(CAP_NET_BIND_SERVICE)) {
1013 err = -EACCES;
1014 goto done;
1015 }
8e87d142 1016
1da177e4
LT		 1017 write_lock_bh(&l2cap_sk_list.lock);
1018
f29972de 1019 if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
1da177e4
LT		 1020 err = -EADDRINUSE;
1021 } else {
1022 /* Save source address */
f29972de
MH		 1023 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
1024 l2cap_pi(sk)->psm = la.l2_psm;
1025 l2cap_pi(sk)->sport = la.l2_psm;
1da177e4 1026 sk->sk_state = BT_BOUND;
2af6b9d5 1027
b4324b5d
MH		 1028 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
1029 __le16_to_cpu(la.l2_psm) == 0x0003)
2af6b9d5 1030 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
1da177e4
LT		 1031 }
1032
1033 write_unlock_bh(&l2cap_sk_list.lock);
1034
1035done:
1036 release_sock(sk);
1037 return err;
1038}
1039
1040static int l2cap_do_connect(struct sock *sk)
1041{
1042 bdaddr_t *src = &bt_sk(sk)->src;
1043 bdaddr_t *dst = &bt_sk(sk)->dst;
1044 struct l2cap_conn *conn;
1045 struct hci_conn *hcon;
1046 struct hci_dev *hdev;
09ab6f4c 1047 __u8 auth_type;
44d0e48e 1048 int err;
1da177e4 1049
f29972de
MH		 1050 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
1051 l2cap_pi(sk)->psm);
1da177e4 1052
af05b30b
GP		 1053 hdev = hci_get_route(dst, src);
1054 if (!hdev)
1da177e4
LT		 1055 return -EHOSTUNREACH;
1056
1057 hci_dev_lock_bh(hdev);
1058
1059 err = -ENOMEM;
1060
8c1b2355 1061 if (sk->sk_type == SOCK_RAW) {
2af6b9d5
MH		 1062 switch (l2cap_pi(sk)->sec_level) {
1063 case BT_SECURITY_HIGH:
8c1b2355 1064 auth_type = HCI_AT_DEDICATED_BONDING_MITM;
2af6b9d5
MH		 1065 break;
1066 case BT_SECURITY_MEDIUM:
8c1b2355 1067 auth_type = HCI_AT_DEDICATED_BONDING;
2af6b9d5
MH		 1068 break;
1069 default:
09ab6f4c 1070 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 1071 break;
1072 }
8c1b2355 1073 } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
2af6b9d5 1074 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
8c1b2355 1075 auth_type = HCI_AT_NO_BONDING_MITM;
09ab6f4c 1076 else
8c1b2355 1077 auth_type = HCI_AT_NO_BONDING;
435fef20
MH		 1078
1079 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
1080 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
8c1b2355 1081 } else {
2af6b9d5
MH		 1082 switch (l2cap_pi(sk)->sec_level) {
1083 case BT_SECURITY_HIGH:
8c1b2355 1084 auth_type = HCI_AT_GENERAL_BONDING_MITM;
2af6b9d5
MH		 1085 break;
1086 case BT_SECURITY_MEDIUM:
09ab6f4c 1087 auth_type = HCI_AT_GENERAL_BONDING;
2af6b9d5
MH		 1088 break;
1089 default:
8c1b2355 1090 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 1091 break;
1092 }
09ab6f4c
MH		 1093 }
1094
2af6b9d5
MH		 1095 hcon = hci_connect(hdev, ACL_LINK, dst,
1096 l2cap_pi(sk)->sec_level, auth_type);
1da177e4
LT		 1097 if (!hcon)
1098 goto done;
1099
1100 conn = l2cap_conn_add(hcon, 0);
1101 if (!conn) {
1102 hci_conn_put(hcon);
1103 goto done;
1104 }
1105
1106 err = 0;
1107
1108 /* Update source addr of the socket */
1109 bacpy(src, conn->src);
1110
1111 l2cap_chan_add(conn, sk, NULL);
1112
1113 sk->sk_state = BT_CONNECT;
1114 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
1115
1116 if (hcon->state == BT_CONNECTED) {
bd3c9e25
GP		 1117 if (sk->sk_type != SOCK_SEQPACKET &&
1118 sk->sk_type != SOCK_STREAM) {
1da177e4
LT		 1119 l2cap_sock_clear_timer(sk);
1120 sk->sk_state = BT_CONNECTED;
79d554a6
MH		 1121 } else
1122 l2cap_do_start(sk);
1da177e4
LT		 1123 }
1124
1125done:
1126 hci_dev_unlock_bh(hdev);
1127 hci_dev_put(hdev);
1128 return err;
1129}
1130
1131static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
1132{
1da177e4 1133 struct sock *sk = sock->sk;
f29972de
MH		 1134 struct sockaddr_l2 la;
1135 int len, err = 0;
1da177e4 1136
1da177e4
LT		 1137 BT_DBG("sk %p", sk);
1138
6503d961
CG		 1139 if (!addr || alen < sizeof(addr->sa_family) ||
1140 addr->sa_family != AF_BLUETOOTH)
2a517ca6 1141 return -EINVAL;
1da177e4 1142
f29972de
MH		 1143 memset(&la, 0, sizeof(la));
1144 len = min_t(unsigned int, sizeof(la), alen);
1145 memcpy(&la, addr, len);
1146
2a517ca6
MH		 1147 if (la.l2_cid)
1148 return -EINVAL;
1149
1150 lock_sock(sk);
1151
bd3c9e25
GP		 1152 if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM)
1153 && !la.l2_psm) {
1da177e4
LT		 1154 err = -EINVAL;
1155 goto done;
1156 }
1157
c6b03cf9
MH		 1158 switch (l2cap_pi(sk)->mode) {
1159 case L2CAP_MODE_BASIC:
1160 break;
1161 case L2CAP_MODE_ERTM:
f2fcfcd6 1162 case L2CAP_MODE_STREAMING:
c6b03cf9
MH		 1163 if (enable_ertm)
1164 break;
1165 /* fall through */
1166 default:
1167 err = -ENOTSUPP;
1168 goto done;
1169 }
1170
af05b30b 1171 switch (sk->sk_state) {
1da177e4
LT		 1172 case BT_CONNECT:
1173 case BT_CONNECT2:
1174 case BT_CONFIG:
1175 /* Already connecting */
1176 goto wait;
1177
1178 case BT_CONNECTED:
1179 /* Already connected */
8b0dc6dc 1180 err = -EISCONN;
1da177e4
LT		 1181 goto done;
1182
1183 case BT_OPEN:
1184 case BT_BOUND:
1185 /* Can connect */
1186 break;
1187
1188 default:
1189 err = -EBADFD;
1190 goto done;
1191 }
1192
1193 /* Set destination address and psm */
f29972de
MH		 1194 bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
1195 l2cap_pi(sk)->psm = la.l2_psm;
1da177e4 1196
af05b30b
GP		 1197 err = l2cap_do_connect(sk);
1198 if (err)
1da177e4
LT		 1199 goto done;
1200
1201wait:
1202 err = bt_sock_wait_state(sk, BT_CONNECTED,
1203 sock_sndtimeo(sk, flags & O_NONBLOCK));
1204done:
1205 release_sock(sk);
1206 return err;
1207}
1208
1209static int l2cap_sock_listen(struct socket *sock, int backlog)
1210{
1211 struct sock *sk = sock->sk;
1212 int err = 0;
1213
1214 BT_DBG("sk %p backlog %d", sk, backlog);
1215
1216 lock_sock(sk);
1217
bd3c9e25
GP		 1218 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
1219 || sk->sk_state != BT_BOUND) {
1da177e4
LT		 1220 err = -EBADFD;
1221 goto done;
1222 }
1223
c6b03cf9
MH		 1224 switch (l2cap_pi(sk)->mode) {
1225 case L2CAP_MODE_BASIC:
1226 break;
1227 case L2CAP_MODE_ERTM:
f2fcfcd6 1228 case L2CAP_MODE_STREAMING:
c6b03cf9
MH		 1229 if (enable_ertm)
1230 break;
1231 /* fall through */
1232 default:
1233 err = -ENOTSUPP;
1234 goto done;
1235 }
1236
1da177e4
LT		 1237 if (!l2cap_pi(sk)->psm) {
1238 bdaddr_t *src = &bt_sk(sk)->src;
1239 u16 psm;
1240
1241 err = -EINVAL;
1242
1243 write_lock_bh(&l2cap_sk_list.lock);
1244
1245 for (psm = 0x1001; psm < 0x1100; psm += 2)
b4324b5d
MH		 1246 if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
1247 l2cap_pi(sk)->psm = cpu_to_le16(psm);
1248 l2cap_pi(sk)->sport = cpu_to_le16(psm);
1da177e4
LT		 1249 err = 0;
1250 break;
1251 }
1252
1253 write_unlock_bh(&l2cap_sk_list.lock);
1254
1255 if (err < 0)
1256 goto done;
1257 }
1258
1259 sk->sk_max_ack_backlog = backlog;
1260 sk->sk_ack_backlog = 0;
1261 sk->sk_state = BT_LISTEN;
1262
1263done:
1264 release_sock(sk);
1265 return err;
1266}
1267
1268static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
1269{
1270 DECLARE_WAITQUEUE(wait, current);
1271 struct sock *sk = sock->sk, *nsk;
1272 long timeo;
1273 int err = 0;
1274
fcc70d5f 1275 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1276
1277 if (sk->sk_state != BT_LISTEN) {
1278 err = -EBADFD;
1279 goto done;
1280 }
1281
1282 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1283
1284 BT_DBG("sk %p timeo %ld", sk, timeo);
1285
1286 /* Wait for an incoming connection. (wake-one). */
aa395145 1287 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 1288 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
1289 set_current_state(TASK_INTERRUPTIBLE);
1290 if (!timeo) {
1291 err = -EAGAIN;
1292 break;
1293 }
1294
1295 release_sock(sk);
1296 timeo = schedule_timeout(timeo);
fcc70d5f 1297 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1298
1299 if (sk->sk_state != BT_LISTEN) {
1300 err = -EBADFD;
1301 break;
1302 }
1303
1304 if (signal_pending(current)) {
1305 err = sock_intr_errno(timeo);
1306 break;
1307 }
1308 }
1309 set_current_state(TASK_RUNNING);
aa395145 1310 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 1311
1312 if (err)
1313 goto done;
1314
1315 newsock->state = SS_CONNECTED;
1316
1317 BT_DBG("new socket %p", nsk);
1318
1319done:
1320 release_sock(sk);
1321 return err;
1322}
1323
1324static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
1325{
1326 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
1327 struct sock *sk = sock->sk;
1328
1329 BT_DBG("sock %p, sk %p", sock, sk);
1330
1331 addr->sa_family = AF_BLUETOOTH;
1332 *len = sizeof(struct sockaddr_l2);
1333
f29972de
MH		 1334 if (peer) {
1335 la->l2_psm = l2cap_pi(sk)->psm;
1da177e4 1336 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
b4324b5d 1337 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
f29972de
MH		 1338 } else {
1339 la->l2_psm = l2cap_pi(sk)->sport;
1da177e4 1340 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
b4324b5d 1341 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
f29972de 1342 }
1da177e4 1343
1da177e4
LT		 1344 return 0;
1345}
1346
6161c038
GP		 1347static int __l2cap_wait_ack(struct sock *sk)
1348{
1349 DECLARE_WAITQUEUE(wait, current);
1350 int err = 0;
1351 int timeo = HZ/5;
1352
2b0b05dd 1353 add_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1354 while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) {
1355 set_current_state(TASK_INTERRUPTIBLE);
1356
1357 if (!timeo)
1358 timeo = HZ/5;
1359
1360 if (signal_pending(current)) {
1361 err = sock_intr_errno(timeo);
1362 break;
1363 }
1364
1365 release_sock(sk);
1366 timeo = schedule_timeout(timeo);
1367 lock_sock(sk);
1368
1369 err = sock_error(sk);
1370 if (err)
1371 break;
1372 }
1373 set_current_state(TASK_RUNNING);
2b0b05dd 1374 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1375 return err;
1376}
1377
e90bac06
GP		 1378static void l2cap_monitor_timeout(unsigned long arg)
1379{
1380 struct sock *sk = (void *) arg;
e90bac06 1381
0e98958d
GP		 1382 BT_DBG("sk %p", sk);
1383
e686219a 1384 bh_lock_sock(sk);
e90bac06 1385 if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
9b108fc0 1386 l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED);
b13f5860 1387 bh_unlock_sock(sk);
e90bac06
GP		 1388 return;
1389 }
1390
1391 l2cap_pi(sk)->retry_count++;
1392 __mod_monitor_timer();
1393
a2e12a2a 1394 l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
e686219a 1395 bh_unlock_sock(sk);
e90bac06
GP		 1396}
1397
1398static void l2cap_retrans_timeout(unsigned long arg)
1399{
1400 struct sock *sk = (void *) arg;
e90bac06 1401
0e98958d
GP		 1402 BT_DBG("sk %p", sk);
1403
e686219a 1404 bh_lock_sock(sk);
e90bac06
GP		 1405 l2cap_pi(sk)->retry_count = 1;
1406 __mod_monitor_timer();
1407
1408 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
1409
a2e12a2a 1410 l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
e686219a 1411 bh_unlock_sock(sk);
e90bac06
GP		 1412}
1413
1c2acffb 1414static void l2cap_drop_acked_frames(struct sock *sk)
1da177e4 1415{
1c2acffb 1416 struct sk_buff *skb;
1da177e4 1417
812e737e
GP		 1418 while ((skb = skb_peek(TX_QUEUE(sk))) &&
1419 l2cap_pi(sk)->unacked_frames) {
1c2acffb
GP		 1420 if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
1421 break;
1da177e4 1422
1c2acffb
GP		 1423 skb = skb_dequeue(TX_QUEUE(sk));
1424 kfree_skb(skb);
1da177e4 1425
1c2acffb
GP		 1426 l2cap_pi(sk)->unacked_frames--;
1427 }
1da177e4 1428
e90bac06
GP		 1429 if (!l2cap_pi(sk)->unacked_frames)
1430 del_timer(&l2cap_pi(sk)->retrans_timer);
1c2acffb 1431}
1da177e4 1432
9a9c6a34 1433static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
1c2acffb
GP		 1434{
1435 struct l2cap_pinfo *pi = l2cap_pi(sk);
1c2acffb
GP		 1436
1437 BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
1da177e4 1438
9a9c6a34 1439 hci_send_acl(pi->conn->hcon, skb, 0);
1c2acffb
GP		 1440}
1441
305682e8 1442static void l2cap_streaming_send(struct sock *sk)
6840ed07
GP		 1443{
1444 struct sk_buff *skb, *tx_skb;
1445 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1446 u16 control, fcs;
6840ed07
GP		 1447
1448 while ((skb = sk->sk_send_head)) {
1449 tx_skb = skb_clone(skb, GFP_ATOMIC);
1450
1451 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1452 control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
1453 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1454
e8235c6b 1455 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1456 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1457 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1458 }
1459
9a9c6a34 1460 l2cap_do_send(sk, tx_skb);
6840ed07
GP		 1461
1462 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1463
1464 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1465 sk->sk_send_head = NULL;
1466 else
1467 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
1468
1469 skb = skb_dequeue(TX_QUEUE(sk));
1470 kfree_skb(skb);
1471 }
6840ed07
GP		 1472}
1473
dfc909be 1474static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq)
8f17154f
GP		 1475{
1476 struct l2cap_pinfo *pi = l2cap_pi(sk);
1477 struct sk_buff *skb, *tx_skb;
1478 u16 control, fcs;
8f17154f
GP		 1479
1480 skb = skb_peek(TX_QUEUE(sk));
f11d676d
GP		 1481 if (!skb)
1482 return;
8f17154f 1483
f11d676d
GP		 1484 do {
1485 if (bt_cb(skb)->tx_seq == tx_seq)
8f17154f 1486 break;
8f17154f 1487
f11d676d
GP		 1488 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1489 return;
8f17154f 1490
f11d676d 1491 } while ((skb = skb_queue_next(TX_QUEUE(sk), skb)));
8f17154f 1492
f11d676d
GP		 1493 if (pi->remote_max_tx &&
1494 bt_cb(skb)->retries == pi->remote_max_tx) {
9b108fc0 1495 l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
f11d676d
GP		 1496 return;
1497 }
1498
1499 tx_skb = skb_clone(skb, GFP_ATOMIC);
1500 bt_cb(skb)->retries++;
1501 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
3cb123d1
GP		 1502
1503 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1504 control |= L2CAP_CTRL_FINAL;
1505 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1506 }
95ffa978 1507
f11d676d
GP		 1508 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1509 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
3cb123d1 1510
f11d676d
GP		 1511 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1512
1513 if (pi->fcs == L2CAP_FCS_CRC16) {
1514 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1515 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1516 }
1517
1518 l2cap_do_send(sk, tx_skb);
8f17154f
GP		 1519}
1520
1c2acffb
GP		 1521static int l2cap_ertm_send(struct sock *sk)
1522{
1523 struct sk_buff *skb, *tx_skb;
1524 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1525 u16 control, fcs;
9a9c6a34 1526 int nsent = 0;
1c2acffb 1527
c13ffa62
GP		 1528 if (sk->sk_state != BT_CONNECTED)
1529 return -ENOTCONN;
e90bac06 1530
6e2b6722 1531 while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) {
1c2acffb 1532
e90bac06
GP		 1533 if (pi->remote_max_tx &&
1534 bt_cb(skb)->retries == pi->remote_max_tx) {
9b108fc0 1535 l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
e90bac06
GP		 1536 break;
1537 }
1538
e420aba3
AE		 1539 tx_skb = skb_clone(skb, GFP_ATOMIC);
1540
e90bac06
GP		 1541 bt_cb(skb)->retries++;
1542
1c2acffb 1543 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
95ffa978
GP		 1544 control &= L2CAP_CTRL_SAR;
1545
d5392c8f
GP		 1546 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1547 control |= L2CAP_CTRL_FINAL;
1548 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1549 }
9f121a5a 1550 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1c2acffb
GP		 1551 | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1552 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1553
e90bac06 1554
e8235c6b 1555 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1556 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1557 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1558 }
1559
9a9c6a34
GP		 1560 l2cap_do_send(sk, tx_skb);
1561
e90bac06 1562 __mod_retrans_timer();
1c2acffb
GP		 1563
1564 bt_cb(skb)->tx_seq = pi->next_tx_seq;
1565 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1566
1567 pi->unacked_frames++;
d5392c8f 1568 pi->frames_sent++;
1c2acffb
GP		 1569
1570 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1571 sk->sk_send_head = NULL;
1572 else
1573 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
9e917af1
GP		 1574
1575 nsent++;
1c2acffb
GP		 1576 }
1577
9e917af1
GP		 1578 return nsent;
1579}
1580
dfc909be
GP		 1581static int l2cap_retransmit_frames(struct sock *sk)
1582{
1583 struct l2cap_pinfo *pi = l2cap_pi(sk);
1584 int ret;
1585
dfc909be
GP		 1586 if (!skb_queue_empty(TX_QUEUE(sk)))
1587 sk->sk_send_head = TX_QUEUE(sk)->next;
1588
1589 pi->next_tx_seq = pi->expected_ack_seq;
1590 ret = l2cap_ertm_send(sk);
dfc909be
GP		 1591 return ret;
1592}
1593
9a9c6a34 1594static void l2cap_send_ack(struct l2cap_pinfo *pi)
9e917af1
GP		 1595{
1596 struct sock *sk = (struct sock *)pi;
1597 u16 control = 0;
1598
1599 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1600
1601 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1602 control |= L2CAP_SUPER_RCV_NOT_READY;
1890d36b 1603 pi->conn_state |= L2CAP_CONN_RNR_SENT;
9a9c6a34
GP		 1604 l2cap_send_sframe(pi, control);
1605 return;
9e917af1 1606 }
dfc909be 1607
e0f66218 1608 if (l2cap_ertm_send(sk) > 0)
dfc909be
GP		 1609 return;
1610
1611 control |= L2CAP_SUPER_RCV_READY;
1612 l2cap_send_sframe(pi, control);
1c2acffb
GP		 1613}
1614
9a9c6a34 1615static void l2cap_send_srejtail(struct sock *sk)
99b0d4b7
GP		 1616{
1617 struct srej_list *tail;
1618 u16 control;
1619
1620 control = L2CAP_SUPER_SELECT_REJECT;
1621 control |= L2CAP_CTRL_FINAL;
1622
1623 tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
1624 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1625
1626 l2cap_send_sframe(l2cap_pi(sk), control);
99b0d4b7
GP		 1627}
1628
1c2acffb
GP		 1629static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1630{
1631 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1632 struct sk_buff **frag;
1633 int err, sent = 0;
1da177e4 1634
59203a21 1635 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1636 return -EFAULT;
1da177e4
LT		 1637
1638 sent += count;
1639 len -= count;
1640
1641 /* Continuation fragments (no L2CAP header) */
1642 frag = &skb_shinfo(skb)->frag_list;
1643 while (len) {
1644 count = min_t(unsigned int, conn->mtu, len);
1645
1646 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1647 if (!*frag)
1c2acffb
GP		 1648 return -EFAULT;
1649 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1650 return -EFAULT;
1da177e4
LT		 1651
1652 sent += count;
1653 len -= count;
1654
1655 frag = &(*frag)->next;
1656 }
1da177e4
LT		 1657
1658 return sent;
1c2acffb 1659}
1da177e4 1660
1c2acffb
GP		 1661static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1662{
1663 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1664 struct sk_buff *skb;
1665 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1666 struct l2cap_hdr *lh;
1667
1668 BT_DBG("sk %p len %d", sk, (int)len);
1669
1670 count = min_t(unsigned int, (conn->mtu - hlen), len);
1671 skb = bt_skb_send_alloc(sk, count + hlen,
1672 msg->msg_flags & MSG_DONTWAIT, &err);
1673 if (!skb)
1674 return ERR_PTR(-ENOMEM);
1675
1676 /* Create L2CAP header */
1677 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1678 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1679 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1680 put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
1681
1682 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1683 if (unlikely(err < 0)) {
1684 kfree_skb(skb);
1685 return ERR_PTR(err);
1686 }
1687 return skb;
1688}
1689
1690static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1691{
1692 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1693 struct sk_buff *skb;
1694 int err, count, hlen = L2CAP_HDR_SIZE;
1695 struct l2cap_hdr *lh;
1696
1697 BT_DBG("sk %p len %d", sk, (int)len);
1698
1699 count = min_t(unsigned int, (conn->mtu - hlen), len);
1700 skb = bt_skb_send_alloc(sk, count + hlen,
1701 msg->msg_flags & MSG_DONTWAIT, &err);
1702 if (!skb)
1703 return ERR_PTR(-ENOMEM);
1704
1705 /* Create L2CAP header */
1706 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1707 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1708 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1709
1710 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1711 if (unlikely(err < 0)) {
1712 kfree_skb(skb);
1713 return ERR_PTR(err);
1714 }
1715 return skb;
1716}
1717
6840ed07 1718static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1c2acffb
GP		 1719{
1720 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1721 struct sk_buff *skb;
1722 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1723 struct l2cap_hdr *lh;
1724
1725 BT_DBG("sk %p len %d", sk, (int)len);
1726
0ee0d208
GP		 1727 if (!conn)
1728 return ERR_PTR(-ENOTCONN);
1729
c74e560c
GP		 1730 if (sdulen)
1731 hlen += 2;
1732
fcc203c3
GP		 1733 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1734 hlen += 2;
1735
1c2acffb
GP		 1736 count = min_t(unsigned int, (conn->mtu - hlen), len);
1737 skb = bt_skb_send_alloc(sk, count + hlen,
1738 msg->msg_flags & MSG_DONTWAIT, &err);
1739 if (!skb)
1740 return ERR_PTR(-ENOMEM);
1741
1742 /* Create L2CAP header */
1743 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1744 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1745 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1746 put_unaligned_le16(control, skb_put(skb, 2));
c74e560c
GP		 1747 if (sdulen)
1748 put_unaligned_le16(sdulen, skb_put(skb, 2));
1c2acffb
GP		 1749
1750 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1751 if (unlikely(err < 0)) {
1752 kfree_skb(skb);
1753 return ERR_PTR(err);
1754 }
e90bac06 1755
fcc203c3
GP		 1756 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1757 put_unaligned_le16(0, skb_put(skb, 2));
1758
e90bac06 1759 bt_cb(skb)->retries = 0;
1c2acffb 1760 return skb;
1da177e4
LT		 1761}
1762
c74e560c
GP		 1763static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
1764{
1765 struct l2cap_pinfo *pi = l2cap_pi(sk);
1766 struct sk_buff *skb;
1767 struct sk_buff_head sar_queue;
1768 u16 control;
1769 size_t size = 0;
1770
ff12fd64 1771 skb_queue_head_init(&sar_queue);
c74e560c 1772 control = L2CAP_SDU_START;
1c762159 1773 skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len);
c74e560c
GP		 1774 if (IS_ERR(skb))
1775 return PTR_ERR(skb);
1776
1777 __skb_queue_tail(&sar_queue, skb);
1c762159
GP		 1778 len -= pi->remote_mps;
1779 size += pi->remote_mps;
c74e560c
GP		 1780
1781 while (len > 0) {
1782 size_t buflen;
1783
1c762159 1784 if (len > pi->remote_mps) {
44651b85 1785 control = L2CAP_SDU_CONTINUE;
1c762159 1786 buflen = pi->remote_mps;
c74e560c 1787 } else {
44651b85 1788 control = L2CAP_SDU_END;
c74e560c
GP		 1789 buflen = len;
1790 }
1791
6840ed07 1792 skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0);
c74e560c
GP		 1793 if (IS_ERR(skb)) {
1794 skb_queue_purge(&sar_queue);
1795 return PTR_ERR(skb);
1796 }
1797
1798 __skb_queue_tail(&sar_queue, skb);
1799 len -= buflen;
1800 size += buflen;
c74e560c
GP		 1801 }
1802 skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
1803 if (sk->sk_send_head == NULL)
1804 sk->sk_send_head = sar_queue.next;
1805
1806 return size;
1807}
1808
1da177e4
LT		 1809static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
1810{
1811 struct sock *sk = sock->sk;
1c2acffb
GP		 1812 struct l2cap_pinfo *pi = l2cap_pi(sk);
1813 struct sk_buff *skb;
1814 u16 control;
1815 int err;
1da177e4
LT		 1816
1817 BT_DBG("sock %p, sk %p", sock, sk);
1818
c1cbe4b7
BL		 1819 err = sock_error(sk);
1820 if (err)
1821 return err;
1da177e4
LT		 1822
1823 if (msg->msg_flags & MSG_OOB)
1824 return -EOPNOTSUPP;
1825
1da177e4
LT		 1826 lock_sock(sk);
1827
1c2acffb 1828 if (sk->sk_state != BT_CONNECTED) {
1da177e4 1829 err = -ENOTCONN;
1c2acffb
GP		 1830 goto done;
1831 }
1da177e4 1832
1c2acffb
GP		 1833 /* Connectionless channel */
1834 if (sk->sk_type == SOCK_DGRAM) {
1835 skb = l2cap_create_connless_pdu(sk, msg, len);
9a9c6a34 1836 if (IS_ERR(skb)) {
477fffb0 1837 err = PTR_ERR(skb);
9a9c6a34
GP		 1838 } else {
1839 l2cap_do_send(sk, skb);
1840 err = len;
1841 }
1c2acffb
GP		 1842 goto done;
1843 }
1844
1845 switch (pi->mode) {
1846 case L2CAP_MODE_BASIC:
c69163e9
GP		 1847 /* Check outgoing MTU */
1848 if (len > pi->omtu) {
f9dd11b0 1849 err = -EMSGSIZE;
c69163e9
GP		 1850 goto done;
1851 }
1852
1c2acffb
GP		 1853 /* Create a basic PDU */
1854 skb = l2cap_create_basic_pdu(sk, msg, len);
1855 if (IS_ERR(skb)) {
1856 err = PTR_ERR(skb);
1857 goto done;
1858 }
1859
9a9c6a34
GP		 1860 l2cap_do_send(sk, skb);
1861 err = len;
1c2acffb
GP		 1862 break;
1863
1864 case L2CAP_MODE_ERTM:
6840ed07 1865 case L2CAP_MODE_STREAMING:
1c2acffb 1866 /* Entire SDU fits into one PDU */
1c762159 1867 if (len <= pi->remote_mps) {
1c2acffb 1868 control = L2CAP_SDU_UNSEGMENTED;
6840ed07 1869 skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
1c2acffb
GP		 1870 if (IS_ERR(skb)) {
1871 err = PTR_ERR(skb);
1872 goto done;
1873 }
c74e560c 1874 __skb_queue_tail(TX_QUEUE(sk), skb);
dfc909be 1875
c74e560c
GP		 1876 if (sk->sk_send_head == NULL)
1877 sk->sk_send_head = skb;
dfc909be 1878
1c2acffb 1879 } else {
c74e560c
GP		 1880 /* Segment SDU into multiples PDUs */
1881 err = l2cap_sar_segment_sdu(sk, msg, len);
1882 if (err < 0)
1883 goto done;
1c2acffb 1884 }
1c2acffb 1885
dfc909be 1886 if (pi->mode == L2CAP_MODE_STREAMING) {
305682e8 1887 l2cap_streaming_send(sk);
dfc909be 1888 } else {
6e2b6722
GP		 1889 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY &&
1890 pi->conn_state && L2CAP_CONN_WAIT_F) {
1891 err = len;
1892 break;
1893 }
6840ed07 1894 err = l2cap_ertm_send(sk);
dfc909be 1895 }
6840ed07 1896
9e917af1 1897 if (err >= 0)
1c2acffb
GP		 1898 err = len;
1899 break;
1900
1901 default:
1902 BT_DBG("bad state %1.1x", pi->mode);
bc766db2 1903 err = -EBADFD;
1c2acffb
GP		 1904 }
1905
1906done:
1da177e4
LT		 1907 release_sock(sk);
1908 return err;
1909}
1910
f66dc81f
MH		 1911static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
1912{
1913 struct sock *sk = sock->sk;
1914
1915 lock_sock(sk);
1916
1917 if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
1918 struct l2cap_conn_rsp rsp;
e9aeb2dd
GP		 1919 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1920 u8 buf[128];
f66dc81f
MH		 1921
1922 sk->sk_state = BT_CONFIG;
1923
1924 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1925 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
1926 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1927 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1928 l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
1929 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1930
e9aeb2dd
GP		 1931 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) {
1932 release_sock(sk);
1933 return 0;
1934 }
1935
1936 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
1937 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1938 l2cap_build_conf_req(sk, buf), buf);
1939 l2cap_pi(sk)->num_conf_req++;
1940
f66dc81f
MH		 1941 release_sock(sk);
1942 return 0;
1943 }
1944
1945 release_sock(sk);
1946
1947 return bt_sock_recvmsg(iocb, sock, msg, len, flags);
1948}
1949
b7058842 1950static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 1951{
1952 struct sock *sk = sock->sk;
1953 struct l2cap_options opts;
f29972de 1954 int len, err = 0;
1da177e4
LT		 1955 u32 opt;
1956
1957 BT_DBG("sk %p", sk);
1958
1959 lock_sock(sk);
1960
1961 switch (optname) {
1962 case L2CAP_OPTIONS:
0878b666
MH		 1963 opts.imtu = l2cap_pi(sk)->imtu;
1964 opts.omtu = l2cap_pi(sk)->omtu;
1965 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 1966 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 1967 opts.fcs = l2cap_pi(sk)->fcs;
68d7f0ce 1968 opts.max_tx = l2cap_pi(sk)->max_tx;
14b5aa71 1969 opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
0878b666 1970
1da177e4
LT		 1971 len = min_t(unsigned int, sizeof(opts), optlen);
1972 if (copy_from_user((char *) &opts, optval, len)) {
1973 err = -EFAULT;
1974 break;
1975 }
0878b666 1976
45d65c46
GP		 1977 if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
1978 err = -EINVAL;
1979 break;
1980 }
1981
0041ecfa
JPRV		 1982 l2cap_pi(sk)->mode = opts.mode;
1983 switch (l2cap_pi(sk)->mode) {
1984 case L2CAP_MODE_BASIC:
85eb53c6 1985 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE;
0041ecfa
JPRV		 1986 break;
1987 case L2CAP_MODE_ERTM:
1988 case L2CAP_MODE_STREAMING:
1989 if (enable_ertm)
1990 break;
1991 /* fall through */
1992 default:
1993 err = -EINVAL;
1994 break;
1995 }
1996
c6b03cf9
MH		 1997 l2cap_pi(sk)->imtu = opts.imtu;
1998 l2cap_pi(sk)->omtu = opts.omtu;
fcc203c3 1999 l2cap_pi(sk)->fcs = opts.fcs;
68d7f0ce 2000 l2cap_pi(sk)->max_tx = opts.max_tx;
14b5aa71 2001 l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size;
1da177e4
LT		 2002 break;
2003
2004 case L2CAP_LM:
2005 if (get_user(opt, (u32 __user *) optval)) {
2006 err = -EFAULT;
2007 break;
2008 }
2009
2af6b9d5
MH		 2010 if (opt & L2CAP_LM_AUTH)
2011 l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
2012 if (opt & L2CAP_LM_ENCRYPT)
2013 l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
2014 if (opt & L2CAP_LM_SECURE)
2015 l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
2016
2017 l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
2018 l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
1da177e4
LT		 2019 break;
2020
2021 default:
2022 err = -ENOPROTOOPT;
2023 break;
2024 }
2025
2026 release_sock(sk);
2027 return err;
2028}
2029
b7058842 2030static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
d58daf42
MH		 2031{
2032 struct sock *sk = sock->sk;
2af6b9d5
MH		 2033 struct bt_security sec;
2034 int len, err = 0;
f66dc81f 2035 u32 opt;
d58daf42
MH		 2036
2037 BT_DBG("sk %p", sk);
2038
2039 if (level == SOL_L2CAP)
2040 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
2041
0588d94f
MH		 2042 if (level != SOL_BLUETOOTH)
2043 return -ENOPROTOOPT;
2044
d58daf42
MH		 2045 lock_sock(sk);
2046
2047 switch (optname) {
2af6b9d5 2048 case BT_SECURITY:
bd3c9e25
GP		 2049 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
2050 && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 2051 err = -EINVAL;
2052 break;
2053 }
2054
2af6b9d5
MH		 2055 sec.level = BT_SECURITY_LOW;
2056
2057 len = min_t(unsigned int, sizeof(sec), optlen);
2058 if (copy_from_user((char *) &sec, optval, len)) {
2059 err = -EFAULT;
2060 break;
2061 }
2062
2063 if (sec.level < BT_SECURITY_LOW ||
2064 sec.level > BT_SECURITY_HIGH) {
2065 err = -EINVAL;
2066 break;
2067 }
2068
2069 l2cap_pi(sk)->sec_level = sec.level;
2070 break;
2071
f66dc81f
MH		 2072 case BT_DEFER_SETUP:
2073 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2074 err = -EINVAL;
2075 break;
2076 }
2077
2078 if (get_user(opt, (u32 __user *) optval)) {
2079 err = -EFAULT;
2080 break;
2081 }
2082
2083 bt_sk(sk)->defer_setup = opt;
2084 break;
2085
d58daf42
MH		 2086 default:
2087 err = -ENOPROTOOPT;
2088 break;
2089 }
2090
2091 release_sock(sk);
2092 return err;
2093}
2094
2095static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
1da177e4
LT		 2096{
2097 struct sock *sk = sock->sk;
2098 struct l2cap_options opts;
2099 struct l2cap_conninfo cinfo;
2100 int len, err = 0;
2af6b9d5 2101 u32 opt;
1da177e4
LT		 2102
2103 BT_DBG("sk %p", sk);
2104
2105 if (get_user(len, optlen))
2106 return -EFAULT;
2107
2108 lock_sock(sk);
2109
2110 switch (optname) {
2111 case L2CAP_OPTIONS:
2112 opts.imtu = l2cap_pi(sk)->imtu;
2113 opts.omtu = l2cap_pi(sk)->omtu;
2114 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 2115 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 2116 opts.fcs = l2cap_pi(sk)->fcs;
68d7f0ce 2117 opts.max_tx = l2cap_pi(sk)->max_tx;
14b5aa71 2118 opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
1da177e4
LT		 2119
2120 len = min_t(unsigned int, len, sizeof(opts));
2121 if (copy_to_user(optval, (char *) &opts, len))
2122 err = -EFAULT;
2123
2124 break;
2125
2126 case L2CAP_LM:
2af6b9d5
MH		 2127 switch (l2cap_pi(sk)->sec_level) {
2128 case BT_SECURITY_LOW:
2129 opt = L2CAP_LM_AUTH;
2130 break;
2131 case BT_SECURITY_MEDIUM:
2132 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
2133 break;
2134 case BT_SECURITY_HIGH:
2135 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
2136 L2CAP_LM_SECURE;
2137 break;
2138 default:
2139 opt = 0;
2140 break;
2141 }
2142
2143 if (l2cap_pi(sk)->role_switch)
2144 opt |= L2CAP_LM_MASTER;
2145
2146 if (l2cap_pi(sk)->force_reliable)
2147 opt |= L2CAP_LM_RELIABLE;
2148
2149 if (put_user(opt, (u32 __user *) optval))
1da177e4
LT		 2150 err = -EFAULT;
2151 break;
2152
2153 case L2CAP_CONNINFO:
f66dc81f
MH		 2154 if (sk->sk_state != BT_CONNECTED &&
2155 !(sk->sk_state == BT_CONNECT2 &&
2156 bt_sk(sk)->defer_setup)) {
1da177e4
LT		 2157 err = -ENOTCONN;
2158 break;
2159 }
2160
2161 cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
2162 memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
2163
2164 len = min_t(unsigned int, len, sizeof(cinfo));
2165 if (copy_to_user(optval, (char *) &cinfo, len))
2166 err = -EFAULT;
2167
2168 break;
2169
2170 default:
2171 err = -ENOPROTOOPT;
2172 break;
2173 }
2174
2175 release_sock(sk);
2176 return err;
2177}
2178
d58daf42
MH		 2179static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
2180{
2181 struct sock *sk = sock->sk;
2af6b9d5 2182 struct bt_security sec;
d58daf42
MH		 2183 int len, err = 0;
2184
2185 BT_DBG("sk %p", sk);
2186
2187 if (level == SOL_L2CAP)
2188 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
2189
0588d94f
MH		 2190 if (level != SOL_BLUETOOTH)
2191 return -ENOPROTOOPT;
2192
d58daf42
MH		 2193 if (get_user(len, optlen))
2194 return -EFAULT;
2195
2196 lock_sock(sk);
2197
2198 switch (optname) {
2af6b9d5 2199 case BT_SECURITY:
bd3c9e25
GP		 2200 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
2201 && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 2202 err = -EINVAL;
2203 break;
2204 }
2205
2af6b9d5
MH		 2206 sec.level = l2cap_pi(sk)->sec_level;
2207
2208 len = min_t(unsigned int, len, sizeof(sec));
2209 if (copy_to_user(optval, (char *) &sec, len))
2210 err = -EFAULT;
2211
2212 break;
2213
f66dc81f
MH		 2214 case BT_DEFER_SETUP:
2215 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2216 err = -EINVAL;
2217 break;
2218 }
2219
2220 if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
2221 err = -EFAULT;
2222
2223 break;
2224
d58daf42
MH		 2225 default:
2226 err = -ENOPROTOOPT;
2227 break;
2228 }
2229
2230 release_sock(sk);
2231 return err;
2232}
2233
1da177e4
LT		 2234static int l2cap_sock_shutdown(struct socket *sock, int how)
2235{
2236 struct sock *sk = sock->sk;
2237 int err = 0;
2238
2239 BT_DBG("sock %p, sk %p", sock, sk);
2240
2241 if (!sk)
2242 return 0;
2243
2244 lock_sock(sk);
2245 if (!sk->sk_shutdown) {
6161c038
GP		 2246 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2247 err = __l2cap_wait_ack(sk);
2248
1da177e4
LT		 2249 sk->sk_shutdown = SHUTDOWN_MASK;
2250 l2cap_sock_clear_timer(sk);
2251 __l2cap_sock_close(sk, 0);
2252
2253 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
b1235d79
MH		 2254 err = bt_sock_wait_state(sk, BT_CLOSED,
2255 sk->sk_lingertime);
1da177e4 2256 }
9b108fc0
GP		 2257
2258 if (!err && sk->sk_err)
2259 err = -sk->sk_err;
2260
1da177e4
LT		 2261 release_sock(sk);
2262 return err;
2263}
2264
2265static int l2cap_sock_release(struct socket *sock)
2266{
2267 struct sock *sk = sock->sk;
2268 int err;
2269
2270 BT_DBG("sock %p, sk %p", sock, sk);
2271
2272 if (!sk)
2273 return 0;
2274
2275 err = l2cap_sock_shutdown(sock, 2);
2276
2277 sock_orphan(sk);
2278 l2cap_sock_kill(sk);
2279 return err;
2280}
2281
1da177e4
LT		 2282static void l2cap_chan_ready(struct sock *sk)
2283{
2284 struct sock *parent = bt_sk(sk)->parent;
2285
2286 BT_DBG("sk %p, parent %p", sk, parent);
2287
2288 l2cap_pi(sk)->conf_state = 0;
2289 l2cap_sock_clear_timer(sk);
2290
2291 if (!parent) {
2292 /* Outgoing channel.
2293 * Wake up socket sleeping on connect.
2294 */
2295 sk->sk_state = BT_CONNECTED;
2296 sk->sk_state_change(sk);
2297 } else {
2298 /* Incoming channel.
2299 * Wake up socket sleeping on accept.
2300 */
2301 parent->sk_data_ready(parent, 0);
2302 }
2303}
2304
2305/* Copy frame to all raw sockets on that connection */
2306static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2307{
2308 struct l2cap_chan_list *l = &conn->chan_list;
2309 struct sk_buff *nskb;
af05b30b 2310 struct sock *sk;
1da177e4
LT		 2311
2312 BT_DBG("conn %p", conn);
2313
2314 read_lock(&l->lock);
2315 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2316 if (sk->sk_type != SOCK_RAW)
2317 continue;
2318
2319 /* Don't send frame to the socket it came from */
2320 if (skb->sk == sk)
2321 continue;
af05b30b
GP		 2322 nskb = skb_clone(skb, GFP_ATOMIC);
2323 if (!nskb)
1da177e4
LT		 2324 continue;
2325
2326 if (sock_queue_rcv_skb(sk, nskb))
2327 kfree_skb(nskb);
2328 }
2329 read_unlock(&l->lock);
2330}
2331
2332/* ---- L2CAP signalling commands ---- */
2333static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2334 u8 code, u8 ident, u16 dlen, void *data)
2335{
2336 struct sk_buff *skb, **frag;
2337 struct l2cap_cmd_hdr *cmd;
2338 struct l2cap_hdr *lh;
2339 int len, count;
2340
af05b30b
GP		 2341 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2342 conn, code, ident, dlen);
1da177e4
LT		 2343
2344 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2345 count = min_t(unsigned int, conn->mtu, len);
2346
2347 skb = bt_skb_alloc(count, GFP_ATOMIC);
2348 if (!skb)
2349 return NULL;
2350
2351 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2352 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
8db4dc46 2353 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2354
2355 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2356 cmd->code = code;
2357 cmd->ident = ident;
aca3192c 2358 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2359
2360 if (dlen) {
2361 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2362 memcpy(skb_put(skb, count), data, count);
2363 data += count;
2364 }
2365
2366 len -= skb->len;
2367
2368 /* Continuation fragments (no L2CAP header) */
2369 frag = &skb_shinfo(skb)->frag_list;
2370 while (len) {
2371 count = min_t(unsigned int, conn->mtu, len);
2372
2373 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2374 if (!*frag)
2375 goto fail;
2376
2377 memcpy(skb_put(*frag, count), data, count);
2378
2379 len -= count;
2380 data += count;
2381
2382 frag = &(*frag)->next;
2383 }
2384
2385 return skb;
2386
2387fail:
2388 kfree_skb(skb);
2389 return NULL;
2390}
2391
2392static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2393{
2394 struct l2cap_conf_opt *opt = *ptr;
2395 int len;
2396
2397 len = L2CAP_CONF_OPT_SIZE + opt->len;
2398 *ptr += len;
2399
2400 *type = opt->type;
2401 *olen = opt->len;
2402
2403 switch (opt->len) {
2404 case 1:
2405 *val = *((u8 *) opt->val);
2406 break;
2407
2408 case 2:
861d6882 2409 *val = __le16_to_cpu(*((__le16 *) opt->val));
1da177e4
LT		 2410 break;
2411
2412 case 4:
861d6882 2413 *val = __le32_to_cpu(*((__le32 *) opt->val));
1da177e4
LT		 2414 break;
2415
2416 default:
2417 *val = (unsigned long) opt->val;
2418 break;
2419 }
2420
2421 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2422 return len;
2423}
2424
1da177e4
LT		 2425static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2426{
2427 struct l2cap_conf_opt *opt = *ptr;
2428
2429 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2430
2431 opt->type = type;
2432 opt->len = len;
2433
2434 switch (len) {
2435 case 1:
2436 *((u8 *) opt->val) = val;
2437 break;
2438
2439 case 2:
8e036fc3 2440 *((__le16 *) opt->val) = cpu_to_le16(val);
1da177e4
LT		 2441 break;
2442
2443 case 4:
8e036fc3 2444 *((__le32 *) opt->val) = cpu_to_le32(val);
1da177e4
LT		 2445 break;
2446
2447 default:
2448 memcpy(opt->val, (void *) val, len);
2449 break;
2450 }
2451
2452 *ptr += L2CAP_CONF_OPT_SIZE + len;
2453}
2454
c1b4f43b
GP		 2455static void l2cap_ack_timeout(unsigned long arg)
2456{
2457 struct sock *sk = (void *) arg;
2458
2459 bh_lock_sock(sk);
2460 l2cap_send_ack(l2cap_pi(sk));
2461 bh_unlock_sock(sk);
2462}
2463
0565c1c2
GP		 2464static inline void l2cap_ertm_init(struct sock *sk)
2465{
2466 l2cap_pi(sk)->expected_ack_seq = 0;
2467 l2cap_pi(sk)->unacked_frames = 0;
2468 l2cap_pi(sk)->buffer_seq = 0;
803020c6 2469 l2cap_pi(sk)->num_acked = 0;
d5392c8f 2470 l2cap_pi(sk)->frames_sent = 0;
0565c1c2
GP		 2471
2472 setup_timer(&l2cap_pi(sk)->retrans_timer,
2473 l2cap_retrans_timeout, (unsigned long) sk);
2474 setup_timer(&l2cap_pi(sk)->monitor_timer,
2475 l2cap_monitor_timeout, (unsigned long) sk);
c1b4f43b
GP		 2476 setup_timer(&l2cap_pi(sk)->ack_timer,
2477 l2cap_ack_timeout, (unsigned long) sk);
0565c1c2
GP		 2478
2479 __skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b
GP		 2480 __skb_queue_head_init(BUSY_QUEUE(sk));
2481
2482 INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work);
218bb9df
GP		 2483
2484 sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
0565c1c2
GP		 2485}
2486
f2fcfcd6
GP		 2487static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2488{
2489 switch (mode) {
2490 case L2CAP_MODE_STREAMING:
2491 case L2CAP_MODE_ERTM:
2492 if (l2cap_mode_supported(mode, remote_feat_mask))
2493 return mode;
2494 /* fall through */
2495 default:
2496 return L2CAP_MODE_BASIC;
2497 }
2498}
2499
1da177e4
LT		 2500static int l2cap_build_conf_req(struct sock *sk, void *data)
2501{
2502 struct l2cap_pinfo *pi = l2cap_pi(sk);
2503 struct l2cap_conf_req *req = data;
bd3c9e25 2504 struct l2cap_conf_rfc rfc = { .mode = pi->mode };
1da177e4
LT		 2505 void *ptr = req->data;
2506
2507 BT_DBG("sk %p", sk);
2508
f2fcfcd6
GP		 2509 if (pi->num_conf_req || pi->num_conf_rsp)
2510 goto done;
2511
2512 switch (pi->mode) {
2513 case L2CAP_MODE_STREAMING:
2514 case L2CAP_MODE_ERTM:
2ba13ed6 2515 if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE)
85eb53c6 2516 break;
85eb53c6 2517
2ba13ed6 2518 /* fall through */
f2fcfcd6
GP		 2519 default:
2520 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2521 break;
2522 }
2523
2524done:
65c7c491
MH		 2525 switch (pi->mode) {
2526 case L2CAP_MODE_BASIC:
2527 if (pi->imtu != L2CAP_DEFAULT_MTU)
2528 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
62547752
GP		 2529
2530 rfc.mode = L2CAP_MODE_BASIC;
2531 rfc.txwin_size = 0;
2532 rfc.max_transmit = 0;
2533 rfc.retrans_timeout = 0;
2534 rfc.monitor_timeout = 0;
2535 rfc.max_pdu_size = 0;
2536
65c7c491
MH		 2537 break;
2538
2539 case L2CAP_MODE_ERTM:
2540 rfc.mode = L2CAP_MODE_ERTM;
14b5aa71 2541 rfc.txwin_size = pi->tx_win;
68d7f0ce 2542 rfc.max_transmit = pi->max_tx;
f2fcfcd6
GP		 2543 rfc.retrans_timeout = 0;
2544 rfc.monitor_timeout = 0;
c74e560c 2545 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2546 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2547 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
f2fcfcd6 2548
fcc203c3
GP		 2549 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2550 break;
2551
2552 if (pi->fcs == L2CAP_FCS_NONE ||
2553 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2554 pi->fcs = L2CAP_FCS_NONE;
2555 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2556 }
f2fcfcd6
GP		 2557 break;
2558
2559 case L2CAP_MODE_STREAMING:
2560 rfc.mode = L2CAP_MODE_STREAMING;
2561 rfc.txwin_size = 0;
2562 rfc.max_transmit = 0;
2563 rfc.retrans_timeout = 0;
2564 rfc.monitor_timeout = 0;
c74e560c 2565 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2566 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2567 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
65c7c491 2568
fcc203c3
GP		 2569 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2570 break;
2571
2572 if (pi->fcs == L2CAP_FCS_NONE ||
2573 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2574 pi->fcs = L2CAP_FCS_NONE;
2575 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2576 }
65c7c491
MH		 2577 break;
2578 }
1da177e4 2579
62547752
GP		 2580 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2581 (unsigned long) &rfc);
2582
1da177e4
LT		 2583 /* FIXME: Need actual value of the flush timeout */
2584 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2585 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2586
aca3192c
YH		 2587 req->dcid = cpu_to_le16(pi->dcid);
2588 req->flags = cpu_to_le16(0);
1da177e4
LT		 2589
2590 return ptr - data;
2591}
2592
5dee9e7c 2593static int l2cap_parse_conf_req(struct sock *sk, void *data)
1da177e4
LT		 2594{
2595 struct l2cap_pinfo *pi = l2cap_pi(sk);
5dee9e7c
MH		 2596 struct l2cap_conf_rsp *rsp = data;
2597 void *ptr = rsp->data;
2598 void *req = pi->conf_req;
2599 int len = pi->conf_len;
2600 int type, hint, olen;
2601 unsigned long val;
6464f35f 2602 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 2603 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2604 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2605
5dee9e7c 2606 BT_DBG("sk %p", sk);
820ae1b8 2607
5dee9e7c
MH		 2608 while (len >= L2CAP_CONF_OPT_SIZE) {
2609 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2610
589d2746 2611 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2612 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2613
2614 switch (type) {
2615 case L2CAP_CONF_MTU:
861d6882 2616 mtu = val;
5dee9e7c
MH		 2617 break;
2618
2619 case L2CAP_CONF_FLUSH_TO:
2620 pi->flush_to = val;
2621 break;
2622
2623 case L2CAP_CONF_QOS:
2624 break;
2625
6464f35f
MH		 2626 case L2CAP_CONF_RFC:
2627 if (olen == sizeof(rfc))
2628 memcpy(&rfc, (void *) val, olen);
2629 break;
2630
fcc203c3
GP		 2631 case L2CAP_CONF_FCS:
2632 if (val == L2CAP_FCS_NONE)
2633 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2634
2635 break;
2636
5dee9e7c
MH		 2637 default:
2638 if (hint)
2639 break;
2640
2641 result = L2CAP_CONF_UNKNOWN;
2642 *((u8 *) ptr++) = type;
2643 break;
2644 }
2645 }
2646
e9aeb2dd 2647 if (pi->num_conf_rsp || pi->num_conf_req > 1)
f2fcfcd6
GP		 2648 goto done;
2649
2650 switch (pi->mode) {
2651 case L2CAP_MODE_STREAMING:
2652 case L2CAP_MODE_ERTM:
85eb53c6
GP		 2653 if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
2654 pi->mode = l2cap_select_mode(rfc.mode,
2655 pi->conn->feat_mask);
2656 break;
2657 }
2658
742e519b 2659 if (pi->mode != rfc.mode)
f2fcfcd6 2660 return -ECONNREFUSED;
742e519b 2661
f2fcfcd6 2662 break;
f2fcfcd6
GP		 2663 }
2664
2665done:
2666 if (pi->mode != rfc.mode) {
2667 result = L2CAP_CONF_UNACCEPT;
2668 rfc.mode = pi->mode;
2669
2670 if (pi->num_conf_rsp == 1)
2671 return -ECONNREFUSED;
2672
2673 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2674 sizeof(rfc), (unsigned long) &rfc);
2675 }
2676
2677
5dee9e7c
MH		 2678 if (result == L2CAP_CONF_SUCCESS) {
2679 /* Configure output options and let the other side know
2680 * which ones we don't like. */
2681
f2fcfcd6
GP		 2682 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2683 result = L2CAP_CONF_UNACCEPT;
2684 else {
2685 pi->omtu = mtu;
2686 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2687 }
2688 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
6464f35f 2689
f2fcfcd6
GP		 2690 switch (rfc.mode) {
2691 case L2CAP_MODE_BASIC:
2692 pi->fcs = L2CAP_FCS_NONE;
2693 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2694 break;
2695
2696 case L2CAP_MODE_ERTM:
2697 pi->remote_tx_win = rfc.txwin_size;
2698 pi->remote_max_tx = rfc.max_transmit;
1c762159
GP		 2699 if (rfc.max_pdu_size > pi->conn->mtu - 10)
2700 rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
2701
2702 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6 2703
10467e9e
GP		 2704 rfc.retrans_timeout =
2705 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2706 rfc.monitor_timeout =
2707 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6
GP		 2708
2709 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2710
2711 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2712 sizeof(rfc), (unsigned long) &rfc);
2713
f2fcfcd6
GP		 2714 break;
2715
2716 case L2CAP_MODE_STREAMING:
1c762159
GP		 2717 if (rfc.max_pdu_size > pi->conn->mtu - 10)
2718 rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
2719
2720 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2721
2722 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2723
2724 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2725 sizeof(rfc), (unsigned long) &rfc);
2726
f2fcfcd6
GP		 2727 break;
2728
2729 default:
5dee9e7c 2730 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2731
6464f35f 2732 memset(&rfc, 0, sizeof(rfc));
f2fcfcd6
GP		 2733 rfc.mode = pi->mode;
2734 }
6464f35f 2735
f2fcfcd6
GP		 2736 if (result == L2CAP_CONF_SUCCESS)
2737 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2738 }
5dee9e7c
MH		 2739 rsp->scid = cpu_to_le16(pi->dcid);
2740 rsp->result = cpu_to_le16(result);
2741 rsp->flags = cpu_to_le16(0x0000);
2742
2743 return ptr - data;
1da177e4
LT		 2744}
2745
f2fcfcd6
GP		 2746static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2747{
2748 struct l2cap_pinfo *pi = l2cap_pi(sk);
2749 struct l2cap_conf_req *req = data;
2750 void *ptr = req->data;
2751 int type, olen;
2752 unsigned long val;
2753 struct l2cap_conf_rfc rfc;
2754
2755 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2756
2757 while (len >= L2CAP_CONF_OPT_SIZE) {
2758 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2759
2760 switch (type) {
2761 case L2CAP_CONF_MTU:
2762 if (val < L2CAP_DEFAULT_MIN_MTU) {
2763 *result = L2CAP_CONF_UNACCEPT;
2764 pi->omtu = L2CAP_DEFAULT_MIN_MTU;
2765 } else
2766 pi->omtu = val;
2767 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2768 break;
2769
2770 case L2CAP_CONF_FLUSH_TO:
2771 pi->flush_to = val;
2772 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2773 2, pi->flush_to);
2774 break;
2775
2776 case L2CAP_CONF_RFC:
2777 if (olen == sizeof(rfc))
2778 memcpy(&rfc, (void *)val, olen);
2779
2780 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2781 rfc.mode != pi->mode)
2782 return -ECONNREFUSED;
2783
f2fcfcd6
GP		 2784 pi->fcs = 0;
2785
2786 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2787 sizeof(rfc), (unsigned long) &rfc);
2788 break;
2789 }
2790 }
2791
6c2ea7a8
GP		 2792 if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode)
2793 return -ECONNREFUSED;
2794
2795 pi->mode = rfc.mode;
2796
f2fcfcd6
GP		 2797 if (*result == L2CAP_CONF_SUCCESS) {
2798 switch (rfc.mode) {
2799 case L2CAP_MODE_ERTM:
2800 pi->remote_tx_win = rfc.txwin_size;
10467e9e
GP		 2801 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2802 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
1c762159 2803 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2804 break;
2805 case L2CAP_MODE_STREAMING:
1c762159 2806 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2807 }
2808 }
2809
2810 req->dcid = cpu_to_le16(pi->dcid);
2811 req->flags = cpu_to_le16(0x0000);
2812
2813 return ptr - data;
2814}
2815
5dee9e7c 2816static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1da177e4
LT		 2817{
2818 struct l2cap_conf_rsp *rsp = data;
2819 void *ptr = rsp->data;
1da177e4 2820
5dee9e7c 2821 BT_DBG("sk %p", sk);
1da177e4 2822
aca3192c 2823 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
5dee9e7c 2824 rsp->result = cpu_to_le16(result);
aca3192c 2825 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2826
2827 return ptr - data;
2828}
2829
7b1c0049
GP		 2830static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
2831{
2832 struct l2cap_pinfo *pi = l2cap_pi(sk);
2833 int type, olen;
2834 unsigned long val;
2835 struct l2cap_conf_rfc rfc;
2836
2837 BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
2838
2839 if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
2840 return;
2841
2842 while (len >= L2CAP_CONF_OPT_SIZE) {
2843 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2844
2845 switch (type) {
2846 case L2CAP_CONF_RFC:
2847 if (olen == sizeof(rfc))
2848 memcpy(&rfc, (void *)val, olen);
2849 goto done;
2850 }
2851 }
2852
2853done:
2854 switch (rfc.mode) {
2855 case L2CAP_MODE_ERTM:
2856 pi->remote_tx_win = rfc.txwin_size;
10467e9e
GP		 2857 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2858 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
7b1c0049
GP		 2859 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2860 break;
2861 case L2CAP_MODE_STREAMING:
2862 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2863 }
2864}
2865
4e8402a3
MH		 2866static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2867{
2868 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2869
2870 if (rej->reason != 0x0000)
2871 return 0;
2872
2873 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2874 cmd->ident == conn->info_ident) {
4e8402a3 2875 del_timer(&conn->info_timer);
984947dc
MH		 2876
2877 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2878 conn->info_ident = 0;
984947dc 2879
4e8402a3
MH		 2880 l2cap_conn_start(conn);
2881 }
2882
2883 return 0;
2884}
2885
1da177e4
LT		 2886static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2887{
2888 struct l2cap_chan_list *list = &conn->chan_list;
2889 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2890 struct l2cap_conn_rsp rsp;
e9aeb2dd 2891 struct sock *parent, *uninitialized_var(sk);
e7c29cb1 2892 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2893
2894 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2895 __le16 psm = req->psm;
1da177e4
LT		 2896
2897 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2898
2899 /* Check if we have socket listening on psm */
2900 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2901 if (!parent) {
2902 result = L2CAP_CR_BAD_PSM;
2903 goto sendresp;
2904 }
2905
e7c29cb1
MH		 2906 /* Check if the ACL is secure enough (if not SDP) */
2907 if (psm != cpu_to_le16(0x0001) &&
2908 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2909 conn->disc_reason = 0x05;
e7c29cb1
MH		 2910 result = L2CAP_CR_SEC_BLOCK;
2911 goto response;
2912 }
2913
1da177e4
LT		 2914 result = L2CAP_CR_NO_MEM;
2915
2916 /* Check for backlog size */
2917 if (sk_acceptq_is_full(parent)) {
8e87d142 2918 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2919 goto response;
2920 }
2921
3b1e0a65 2922 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1da177e4
LT		 2923 if (!sk)
2924 goto response;
2925
fd1278d7 2926 write_lock_bh(&list->lock);
1da177e4
LT		 2927
2928 /* Check if we already have channel with that dcid */
2929 if (__l2cap_get_chan_by_dcid(list, scid)) {
fd1278d7 2930 write_unlock_bh(&list->lock);
1da177e4
LT		 2931 sock_set_flag(sk, SOCK_ZAPPED);
2932 l2cap_sock_kill(sk);
2933 goto response;
2934 }
2935
2936 hci_conn_hold(conn->hcon);
2937
2938 l2cap_sock_init(sk, parent);
2939 bacpy(&bt_sk(sk)->src, conn->src);
2940 bacpy(&bt_sk(sk)->dst, conn->dst);
2941 l2cap_pi(sk)->psm = psm;
2942 l2cap_pi(sk)->dcid = scid;
2943
2944 __l2cap_chan_add(conn, sk, parent);
2945 dcid = l2cap_pi(sk)->scid;
2946
2947 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2948
1da177e4
LT		 2949 l2cap_pi(sk)->ident = cmd->ident;
2950
984947dc 2951 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2af6b9d5 2952 if (l2cap_check_security(sk)) {
f66dc81f
MH		 2953 if (bt_sk(sk)->defer_setup) {
2954 sk->sk_state = BT_CONNECT2;
2955 result = L2CAP_CR_PEND;
2956 status = L2CAP_CS_AUTHOR_PEND;
2957 parent->sk_data_ready(parent, 0);
2958 } else {
2959 sk->sk_state = BT_CONFIG;
2960 result = L2CAP_CR_SUCCESS;
2961 status = L2CAP_CS_NO_INFO;
2962 }
79d554a6
MH		 2963 } else {
2964 sk->sk_state = BT_CONNECT2;
2965 result = L2CAP_CR_PEND;
2966 status = L2CAP_CS_AUTHEN_PEND;
2967 }
2968 } else {
2969 sk->sk_state = BT_CONNECT2;
2970 result = L2CAP_CR_PEND;
2971 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2972 }
2973
fd1278d7 2974 write_unlock_bh(&list->lock);
1da177e4
LT		 2975
2976response:
2977 bh_unlock_sock(parent);
2978
2979sendresp:
aca3192c
YH		 2980 rsp.scid = cpu_to_le16(scid);
2981 rsp.dcid = cpu_to_le16(dcid);
2982 rsp.result = cpu_to_le16(result);
2983 rsp.status = cpu_to_le16(status);
1da177e4 2984 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2985
2986 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2987 struct l2cap_info_req info;
2988 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2989
2990 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2991 conn->info_ident = l2cap_get_ident(conn);
2992
2993 mod_timer(&conn->info_timer, jiffies +
2994 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2995
2996 l2cap_send_cmd(conn, conn->info_ident,
2997 L2CAP_INFO_REQ, sizeof(info), &info);
2998 }
2999
e9aeb2dd
GP		 3000 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) &&
3001 result == L2CAP_CR_SUCCESS) {
3002 u8 buf[128];
3003 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
3004 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3005 l2cap_build_conf_req(sk, buf), buf);
3006 l2cap_pi(sk)->num_conf_req++;
3007 }
3008
1da177e4
LT		 3009 return 0;
3010}
3011
3012static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3013{
3014 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3015 u16 scid, dcid, result, status;
3016 struct sock *sk;
3017 u8 req[128];
3018
3019 scid = __le16_to_cpu(rsp->scid);
3020 dcid = __le16_to_cpu(rsp->dcid);
3021 result = __le16_to_cpu(rsp->result);
3022 status = __le16_to_cpu(rsp->status);
3023
3024 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
3025
3026 if (scid) {
af05b30b
GP		 3027 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3028 if (!sk)
57d3b22b 3029 return -EFAULT;
1da177e4 3030 } else {
af05b30b
GP		 3031 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
3032 if (!sk)
57d3b22b 3033 return -EFAULT;
1da177e4
LT		 3034 }
3035
3036 switch (result) {
3037 case L2CAP_CR_SUCCESS:
3038 sk->sk_state = BT_CONFIG;
3039 l2cap_pi(sk)->ident = 0;
3040 l2cap_pi(sk)->dcid = dcid;
6a8d3010
MH		 3041 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
3042
e9aeb2dd
GP		 3043 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)
3044 break;
3045
3046 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
3047
1da177e4
LT		 3048 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3049 l2cap_build_conf_req(sk, req), req);
f2fcfcd6 3050 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3051 break;
3052
3053 case L2CAP_CR_PEND:
6a8d3010 3054 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 3055 break;
3056
3057 default:
3058 l2cap_chan_del(sk, ECONNREFUSED);
3059 break;
3060 }
3061
3062 bh_unlock_sock(sk);
3063 return 0;
3064}
3065
88219a0f 3066static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3067{
3068 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3069 u16 dcid, flags;
3070 u8 rsp[64];
3071 struct sock *sk;
5dee9e7c 3072 int len;
1da177e4
LT		 3073
3074 dcid = __le16_to_cpu(req->dcid);
3075 flags = __le16_to_cpu(req->flags);
3076
3077 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3078
af05b30b
GP		 3079 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3080 if (!sk)
1da177e4
LT		 3081 return -ENOENT;
3082
8cb8e6f1
GP		 3083 if (sk->sk_state != BT_CONFIG) {
3084 struct l2cap_cmd_rej rej;
3085
3086 rej.reason = cpu_to_le16(0x0002);
3087 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
3088 sizeof(rej), &rej);
354f60a9 3089 goto unlock;
8cb8e6f1 3090 }
354f60a9 3091
5dee9e7c 3092 /* Reject if config buffer is too small. */
88219a0f 3093 len = cmd_len - sizeof(*req);
5dee9e7c
MH		 3094 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
3095 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3096 l2cap_build_conf_rsp(sk, rsp,
3097 L2CAP_CONF_REJECT, flags), rsp);
3098 goto unlock;
3099 }
3100
3101 /* Store config. */
3102 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
3103 l2cap_pi(sk)->conf_len += len;
1da177e4
LT		 3104
3105 if (flags & 0x0001) {
3106 /* Incomplete config. Send empty response. */
3107 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
5dee9e7c
MH		 3108 l2cap_build_conf_rsp(sk, rsp,
3109 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 3110 goto unlock;
3111 }
3112
3113 /* Complete config. */
5dee9e7c 3114 len = l2cap_parse_conf_req(sk, rsp);
f2fcfcd6 3115 if (len < 0) {
9b108fc0 3116 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4 3117 goto unlock;
f2fcfcd6 3118 }
1da177e4 3119
5dee9e7c 3120 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
f2fcfcd6 3121 l2cap_pi(sk)->num_conf_rsp++;
5dee9e7c 3122
5dee9e7c
MH		 3123 /* Reset config buffer. */
3124 l2cap_pi(sk)->conf_len = 0;
3125
876d9484
MH		 3126 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
3127 goto unlock;
3128
1da177e4 3129 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
f64f9e71
JP		 3130 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
3131 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 3132 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
3133
1da177e4 3134 sk->sk_state = BT_CONNECTED;
e90bac06 3135
0565c1c2
GP		 3136 l2cap_pi(sk)->next_tx_seq = 0;
3137 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3138 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3139 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3140 l2cap_ertm_init(sk);
3141
1da177e4 3142 l2cap_chan_ready(sk);
876d9484
MH		 3143 goto unlock;
3144 }
3145
3146 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 3147 u8 buf[64];
1da177e4 3148 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
79d554a6 3149 l2cap_build_conf_req(sk, buf), buf);
f2fcfcd6 3150 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3151 }
3152
3153unlock:
3154 bh_unlock_sock(sk);
3155 return 0;
3156}
3157
3158static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3159{
3160 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3161 u16 scid, flags, result;
3162 struct sock *sk;
7b1c0049 3163 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 3164
3165 scid = __le16_to_cpu(rsp->scid);
3166 flags = __le16_to_cpu(rsp->flags);
3167 result = __le16_to_cpu(rsp->result);
3168
af05b30b
GP		 3169 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
3170 scid, flags, result);
1da177e4 3171
af05b30b
GP		 3172 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3173 if (!sk)
1da177e4
LT		 3174 return 0;
3175
3176 switch (result) {
3177 case L2CAP_CONF_SUCCESS:
7b1c0049 3178 l2cap_conf_rfc_get(sk, rsp->data, len);
1da177e4
LT		 3179 break;
3180
3181 case L2CAP_CONF_UNACCEPT:
f2fcfcd6 3182 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3183 char req[64];
3184
c2c77ec8 3185 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
9b108fc0 3186 l2cap_send_disconn_req(conn, sk, ECONNRESET);
c2c77ec8
AE		 3187 goto done;
3188 }
3189
f2fcfcd6
GP		 3190 /* throw out any old stored conf requests */
3191 result = L2CAP_CONF_SUCCESS;
3192 len = l2cap_parse_conf_rsp(sk, rsp->data,
3193 len, req, &result);
3194 if (len < 0) {
9b108fc0 3195 l2cap_send_disconn_req(conn, sk, ECONNRESET);
f2fcfcd6
GP		 3196 goto done;
3197 }
3198
3199 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3200 L2CAP_CONF_REQ, len, req);
3201 l2cap_pi(sk)->num_conf_req++;
3202 if (result != L2CAP_CONF_SUCCESS)
3203 goto done;
3204 break;
1da177e4
LT		 3205 }
3206
8e87d142 3207 default:
b1235d79 3208 sk->sk_err = ECONNRESET;
1da177e4 3209 l2cap_sock_set_timer(sk, HZ * 5);
9b108fc0 3210 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4
LT		 3211 goto done;
3212 }
3213
3214 if (flags & 0x01)
3215 goto done;
3216
1da177e4
LT		 3217 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
3218
3219 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
f64f9e71
JP		 3220 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
3221 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 3222 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
3223
1da177e4 3224 sk->sk_state = BT_CONNECTED;
0565c1c2 3225 l2cap_pi(sk)->next_tx_seq = 0;
1c2acffb 3226 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3227 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3228 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3229 l2cap_ertm_init(sk);
3230
1da177e4
LT		 3231 l2cap_chan_ready(sk);
3232 }
3233
3234done:
3235 bh_unlock_sock(sk);
3236 return 0;
3237}
3238
3239static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3240{
3241 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3242 struct l2cap_disconn_rsp rsp;
3243 u16 dcid, scid;
3244 struct sock *sk;
3245
3246 scid = __le16_to_cpu(req->scid);
3247 dcid = __le16_to_cpu(req->dcid);
3248
3249 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3250
af05b30b
GP		 3251 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3252 if (!sk)
1da177e4
LT		 3253 return 0;
3254
aca3192c
YH		 3255 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3256 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1da177e4
LT		 3257 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3258
3259 sk->sk_shutdown = SHUTDOWN_MASK;
3260
3261 l2cap_chan_del(sk, ECONNRESET);
3262 bh_unlock_sock(sk);
3263
3264 l2cap_sock_kill(sk);
3265 return 0;
3266}
3267
3268static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3269{
3270 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3271 u16 dcid, scid;
3272 struct sock *sk;
3273
3274 scid = __le16_to_cpu(rsp->scid);
3275 dcid = __le16_to_cpu(rsp->dcid);
3276
3277 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3278
af05b30b
GP		 3279 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3280 if (!sk)
1da177e4
LT		 3281 return 0;
3282
3283 l2cap_chan_del(sk, 0);
3284 bh_unlock_sock(sk);
3285
3286 l2cap_sock_kill(sk);
3287 return 0;
3288}
3289
3290static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3291{
3292 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3293 u16 type;
3294
3295 type = __le16_to_cpu(req->type);
3296
3297 BT_DBG("type 0x%4.4x", type);
3298
f0709e03
MH		 3299 if (type == L2CAP_IT_FEAT_MASK) {
3300 u8 buf[8];
44dd46de 3301 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3302 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3303 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3304 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
44dd46de 3305 if (enable_ertm)
fcc203c3
GP		 3306 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3307 | L2CAP_FEAT_FCS;
1b7bf4ed 3308 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3309 l2cap_send_cmd(conn, cmd->ident,
3310 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3311 } else if (type == L2CAP_IT_FIXED_CHAN) {
3312 u8 buf[12];
3313 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3314 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3315 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3316 memcpy(buf + 4, l2cap_fixed_chan, 8);
3317 l2cap_send_cmd(conn, cmd->ident,
3318 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3319 } else {
3320 struct l2cap_info_rsp rsp;
3321 rsp.type = cpu_to_le16(type);
3322 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3323 l2cap_send_cmd(conn, cmd->ident,
3324 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3325 }
1da177e4
LT		 3326
3327 return 0;
3328}
3329
3330static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3331{
3332 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3333 u16 type, result;
3334
3335 type = __le16_to_cpu(rsp->type);
3336 result = __le16_to_cpu(rsp->result);
3337
3338 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3339
4e8402a3
MH		 3340 del_timer(&conn->info_timer);
3341
984947dc 3342 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3343 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3344
47ec1dcd 3345 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3346 struct l2cap_info_req req;
3347 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3348
3349 conn->info_ident = l2cap_get_ident(conn);
3350
3351 l2cap_send_cmd(conn, conn->info_ident,
3352 L2CAP_INFO_REQ, sizeof(req), &req);
3353 } else {
3354 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3355 conn->info_ident = 0;
3356
3357 l2cap_conn_start(conn);
3358 }
3359 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3360 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3361 conn->info_ident = 0;
984947dc
MH		 3362
3363 l2cap_conn_start(conn);
3364 }
4e8402a3 3365
1da177e4
LT		 3366 return 0;
3367}
3368
3369static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3370{
3371 u8 *data = skb->data;
3372 int len = skb->len;
3373 struct l2cap_cmd_hdr cmd;
3374 int err = 0;
3375
3376 l2cap_raw_recv(conn, skb);
3377
3378 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3379 u16 cmd_len;
1da177e4
LT		 3380 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3381 data += L2CAP_CMD_HDR_SIZE;
3382 len -= L2CAP_CMD_HDR_SIZE;
3383
88219a0f 3384 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3385
88219a0f 3386 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3387
88219a0f 3388 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3389 BT_DBG("corrupted command");
3390 break;
3391 }
3392
3393 switch (cmd.code) {
3394 case L2CAP_COMMAND_REJ:
4e8402a3 3395 l2cap_command_rej(conn, &cmd, data);
1da177e4
LT		 3396 break;
3397
3398 case L2CAP_CONN_REQ:
3399 err = l2cap_connect_req(conn, &cmd, data);
3400 break;
3401
3402 case L2CAP_CONN_RSP:
3403 err = l2cap_connect_rsp(conn, &cmd, data);
3404 break;
3405
3406 case L2CAP_CONF_REQ:
88219a0f 3407 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1da177e4
LT		 3408 break;
3409
3410 case L2CAP_CONF_RSP:
3411 err = l2cap_config_rsp(conn, &cmd, data);
3412 break;
3413
3414 case L2CAP_DISCONN_REQ:
3415 err = l2cap_disconnect_req(conn, &cmd, data);
3416 break;
3417
3418 case L2CAP_DISCONN_RSP:
3419 err = l2cap_disconnect_rsp(conn, &cmd, data);
3420 break;
3421
3422 case L2CAP_ECHO_REQ:
88219a0f 3423 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1da177e4
LT		 3424 break;
3425
3426 case L2CAP_ECHO_RSP:
3427 break;
3428
3429 case L2CAP_INFO_REQ:
3430 err = l2cap_information_req(conn, &cmd, data);
3431 break;
3432
3433 case L2CAP_INFO_RSP:
3434 err = l2cap_information_rsp(conn, &cmd, data);
3435 break;
3436
3437 default:
3438 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3439 err = -EINVAL;
3440 break;
3441 }
3442
3443 if (err) {
3444 struct l2cap_cmd_rej rej;
3445 BT_DBG("error %d", err);
3446
3447 /* FIXME: Map err to a valid reason */
aca3192c 3448 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3449 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3450 }
3451
88219a0f
AV		 3452 data += cmd_len;
3453 len -= cmd_len;
1da177e4
LT		 3454 }
3455
3456 kfree_skb(skb);
3457}
3458
fcc203c3
GP		 3459static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3460{
3461 u16 our_fcs, rcv_fcs;
3462 int hdr_size = L2CAP_HDR_SIZE + 2;
3463
3464 if (pi->fcs == L2CAP_FCS_CRC16) {
3465 skb_trim(skb, skb->len - 2);
3466 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3467 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3468
3469 if (our_fcs != rcv_fcs)
7a560e5c 3470 return -EBADMSG;
fcc203c3
GP		 3471 }
3472 return 0;
3473}
3474
d5392c8f
GP		 3475static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3476{
3477 struct l2cap_pinfo *pi = l2cap_pi(sk);
3478 u16 control = 0;
3479
3480 pi->frames_sent = 0;
d5392c8f
GP		 3481
3482 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3483
3484 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
64988868 3485 control |= L2CAP_SUPER_RCV_NOT_READY;
d5392c8f 3486 l2cap_send_sframe(pi, control);
1890d36b 3487 pi->conn_state |= L2CAP_CONN_RNR_SENT;
d5392c8f
GP		 3488 }
3489
4ea727ef
GP		 3490 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY)
3491 l2cap_retransmit_frames(sk);
d5392c8f
GP		 3492
3493 l2cap_ertm_send(sk);
3494
3495 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3496 pi->frames_sent == 0) {
3497 control |= L2CAP_SUPER_RCV_READY;
d5392c8f
GP		 3498 l2cap_send_sframe(pi, control);
3499 }
3500}
3501
9b53350d 3502static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
8f17154f
GP		 3503{
3504 struct sk_buff *next_skb;
bfbacc11
JPRV		 3505 struct l2cap_pinfo *pi = l2cap_pi(sk);
3506 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3507
3508 bt_cb(skb)->tx_seq = tx_seq;
3509 bt_cb(skb)->sar = sar;
3510
3511 next_skb = skb_peek(SREJ_QUEUE(sk));
3512 if (!next_skb) {
3513 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d 3514 return 0;
8f17154f
GP		 3515 }
3516
bfbacc11
JPRV		 3517 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3518 if (tx_seq_offset < 0)
3519 tx_seq_offset += 64;
3520
8f17154f 3521 do {
9b53350d
JPRV		 3522 if (bt_cb(next_skb)->tx_seq == tx_seq)
3523 return -EINVAL;
3524
bfbacc11
JPRV		 3525 next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
3526 pi->buffer_seq) % 64;
3527 if (next_tx_seq_offset < 0)
3528 next_tx_seq_offset += 64;
3529
3530 if (next_tx_seq_offset > tx_seq_offset) {
8f17154f 3531 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
9b53350d 3532 return 0;
8f17154f
GP		 3533 }
3534
3535 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3536 break;
3537
59203a21 3538 } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
8f17154f
GP		 3539
3540 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d
JPRV		 3541
3542 return 0;
8f17154f
GP		 3543}
3544
18778a63
GP		 3545static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3546{
3547 struct l2cap_pinfo *pi = l2cap_pi(sk);
3548 struct sk_buff *_skb;
1890d36b 3549 int err;
18778a63
GP		 3550
3551 switch (control & L2CAP_CTRL_SAR) {
3552 case L2CAP_SDU_UNSEGMENTED:
3553 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3554 goto drop;
3555
3556 err = sock_queue_rcv_skb(sk, skb);
3557 if (!err)
3558 return err;
3559
3560 break;
3561
3562 case L2CAP_SDU_START:
3563 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3564 goto drop;
3565
3566 pi->sdu_len = get_unaligned_le16(skb->data);
18778a63
GP		 3567
3568 if (pi->sdu_len > pi->imtu)
3569 goto disconnect;
3570
3571 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
1890d36b
GP		 3572 if (!pi->sdu)
3573 return -ENOMEM;
3574
3575 /* pull sdu_len bytes only after alloc, because of Local Busy
3576 * condition we have to be sure that this will be executed
3577 * only once, i.e., when alloc does not fail */
3578 skb_pull(skb, 2);
18778a63
GP		 3579
3580 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3581
3582 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3583 pi->partial_sdu_len = skb->len;
3584 break;
3585
3586 case L2CAP_SDU_CONTINUE:
3587 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3588 goto disconnect;
3589
3590 if (!pi->sdu)
3591 goto disconnect;
3592
18778a63
GP		 3593 pi->partial_sdu_len += skb->len;
3594 if (pi->partial_sdu_len > pi->sdu_len)
3595 goto drop;
3596
4178ba46
GP		 3597 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3598
18778a63
GP		 3599 break;
3600
3601 case L2CAP_SDU_END:
3602 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3603 goto disconnect;
3604
3605 if (!pi->sdu)
3606 goto disconnect;
3607
1890d36b 3608 if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) {
1890d36b 3609 pi->partial_sdu_len += skb->len;
18778a63 3610
1890d36b
GP		 3611 if (pi->partial_sdu_len > pi->imtu)
3612 goto drop;
18778a63 3613
1890d36b
GP		 3614 if (pi->partial_sdu_len != pi->sdu_len)
3615 goto drop;
4178ba46
GP		 3616
3617 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
1890d36b 3618 }
18778a63
GP		 3619
3620 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
1890d36b
GP		 3621 if (!_skb) {
3622 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3623 return -ENOMEM;
3624 }
3625
18778a63 3626 err = sock_queue_rcv_skb(sk, _skb);
1890d36b 3627 if (err < 0) {
18778a63 3628 kfree_skb(_skb);
1890d36b
GP		 3629 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3630 return err;
3631 }
3632
3633 pi->conn_state &= ~L2CAP_CONN_SAR_RETRY;
3634 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
18778a63
GP		 3635
3636 kfree_skb(pi->sdu);
3637 break;
3638 }
3639
3640 kfree_skb(skb);
1890d36b 3641 return 0;
18778a63
GP		 3642
3643drop:
3644 kfree_skb(pi->sdu);
3645 pi->sdu = NULL;
3646
3647disconnect:
9b108fc0 3648 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
18778a63
GP		 3649 kfree_skb(skb);
3650 return 0;
3651}
3652
712132eb
GP		 3653static int l2cap_try_push_rx_skb(struct sock *sk)
3654{
3655 struct l2cap_pinfo *pi = l2cap_pi(sk);
3656 struct sk_buff *skb;
3657 u16 control;
3658 int err;
3659
3660 while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) {
3661 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3662 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3663 if (err < 0) {
3664 skb_queue_head(BUSY_QUEUE(sk), skb);
3665 return -EBUSY;
3666 }
3667
3668 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3669 }
3670
3671 if (!(pi->conn_state & L2CAP_CONN_RNR_SENT))
3672 goto done;
3673
3674 control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3675 control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
3676 l2cap_send_sframe(pi, control);
3677 l2cap_pi(sk)->retry_count = 1;
3678
3679 del_timer(&pi->retrans_timer);
3680 __mod_monitor_timer();
3681
3682 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
3683
3684done:
3685 pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
3686 pi->conn_state &= ~L2CAP_CONN_RNR_SENT;
3687
3688 BT_DBG("sk %p, Exit local busy", sk);
3689
3690 return 0;
3691}
3692
1890d36b
GP		 3693static void l2cap_busy_work(struct work_struct *work)
3694{
3695 DECLARE_WAITQUEUE(wait, current);
3696 struct l2cap_pinfo *pi =
3697 container_of(work, struct l2cap_pinfo, busy_work);
3698 struct sock *sk = (struct sock *)pi;
3699 int n_tries = 0, timeo = HZ/5, err;
3700 struct sk_buff *skb;
1890d36b
GP		 3701
3702 lock_sock(sk);
3703
2b0b05dd 3704 add_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3705 while ((skb = skb_peek(BUSY_QUEUE(sk)))) {
3706 set_current_state(TASK_INTERRUPTIBLE);
3707
3708 if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
3709 err = -EBUSY;
9b108fc0 3710 l2cap_send_disconn_req(pi->conn, sk, EBUSY);
712132eb 3711 break;
1890d36b
GP		 3712 }
3713
3714 if (!timeo)
3715 timeo = HZ/5;
3716
3717 if (signal_pending(current)) {
3718 err = sock_intr_errno(timeo);
712132eb 3719 break;
1890d36b
GP		 3720 }
3721
3722 release_sock(sk);
3723 timeo = schedule_timeout(timeo);
3724 lock_sock(sk);
3725
3726 err = sock_error(sk);
3727 if (err)
712132eb 3728 break;
1890d36b 3729
712132eb 3730 if (l2cap_try_push_rx_skb(sk) == 0)
1890d36b
GP		 3731 break;
3732 }
3733
1890d36b 3734 set_current_state(TASK_RUNNING);
2b0b05dd 3735 remove_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3736
3737 release_sock(sk);
3738}
3739
3740static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control)
3741{
3742 struct l2cap_pinfo *pi = l2cap_pi(sk);
3743 int sctrl, err;
3744
3745 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3746 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3747 __skb_queue_tail(BUSY_QUEUE(sk), skb);
712132eb
GP		 3748 return l2cap_try_push_rx_skb(sk);
3749
3750
1890d36b
GP		 3751 }
3752
3753 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3754 if (err >= 0) {
3755 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3756 return err;
3757 }
3758
3759 /* Busy Condition */
0e98958d
GP		 3760 BT_DBG("sk %p, Enter local busy", sk);
3761
1890d36b
GP		 3762 pi->conn_state |= L2CAP_CONN_LOCAL_BUSY;
3763 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3764 __skb_queue_tail(BUSY_QUEUE(sk), skb);
3765
3766 sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3767 sctrl |= L2CAP_SUPER_RCV_NOT_READY;
3768 l2cap_send_sframe(pi, sctrl);
3769
3770 pi->conn_state |= L2CAP_CONN_RNR_SENT;
3771
7fe9b298
GP		 3772 del_timer(&pi->ack_timer);
3773
1890d36b
GP		 3774 queue_work(_busy_wq, &pi->busy_work);
3775
3776 return err;
3777}
3778
18778a63 3779static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
c74e560c
GP		 3780{
3781 struct l2cap_pinfo *pi = l2cap_pi(sk);
3782 struct sk_buff *_skb;
3783 int err = -EINVAL;
3784
18778a63
GP		 3785 /*
3786 * TODO: We have to notify the userland if some data is lost with the
3787 * Streaming Mode.
3788 */
3789
c74e560c
GP		 3790 switch (control & L2CAP_CTRL_SAR) {
3791 case L2CAP_SDU_UNSEGMENTED:
3792 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3793 kfree_skb(pi->sdu);
3794 break;
3795 }
3796
3797 err = sock_queue_rcv_skb(sk, skb);
3798 if (!err)
3799 return 0;
3800
3801 break;
3802
3803 case L2CAP_SDU_START:
3804 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3805 kfree_skb(pi->sdu);
3806 break;
3807 }
3808
3809 pi->sdu_len = get_unaligned_le16(skb->data);
3810 skb_pull(skb, 2);
3811
052897ca
GP		 3812 if (pi->sdu_len > pi->imtu) {
3813 err = -EMSGSIZE;
3814 break;
3815 }
3816
c74e560c
GP		 3817 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3818 if (!pi->sdu) {
3819 err = -ENOMEM;
3820 break;
3821 }
3822
3823 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3824
3825 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3826 pi->partial_sdu_len = skb->len;
3827 err = 0;
3828 break;
3829
3830 case L2CAP_SDU_CONTINUE:
3831 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3832 break;
3833
3834 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3835
3836 pi->partial_sdu_len += skb->len;
3837 if (pi->partial_sdu_len > pi->sdu_len)
3838 kfree_skb(pi->sdu);
3839 else
3840 err = 0;
3841
3842 break;
3843
3844 case L2CAP_SDU_END:
3845 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3846 break;
3847
3848 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3849
3850 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3851 pi->partial_sdu_len += skb->len;
3852
36f2fd58
GP		 3853 if (pi->partial_sdu_len > pi->imtu)
3854 goto drop;
3855
c74e560c
GP		 3856 if (pi->partial_sdu_len == pi->sdu_len) {
3857 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3858 err = sock_queue_rcv_skb(sk, _skb);
3859 if (err < 0)
3860 kfree_skb(_skb);
3861 }
c74e560c
GP		 3862 err = 0;
3863
36f2fd58
GP		 3864drop:
3865 kfree_skb(pi->sdu);
c74e560c
GP		 3866 break;
3867 }
3868
3869 kfree_skb(skb);
3870 return err;
3871}
3872
8f17154f
GP		 3873static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3874{
3875 struct sk_buff *skb;
afefdbc4 3876 u16 control;
8f17154f 3877
59203a21 3878 while ((skb = skb_peek(SREJ_QUEUE(sk)))) {
8f17154f
GP		 3879 if (bt_cb(skb)->tx_seq != tx_seq)
3880 break;
3881
3882 skb = skb_dequeue(SREJ_QUEUE(sk));
afefdbc4 3883 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
18778a63 3884 l2cap_ertm_reassembly_sdu(sk, skb, control);
8f17154f
GP		 3885 l2cap_pi(sk)->buffer_seq_srej =
3886 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
8ff50ec0 3887 tx_seq = (tx_seq + 1) % 64;
8f17154f
GP		 3888 }
3889}
3890
3891static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3892{
3893 struct l2cap_pinfo *pi = l2cap_pi(sk);
3894 struct srej_list *l, *tmp;
3895 u16 control;
3896
59203a21 3897 list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
8f17154f
GP		 3898 if (l->tx_seq == tx_seq) {
3899 list_del(&l->list);
3900 kfree(l);
3901 return;
3902 }
3903 control = L2CAP_SUPER_SELECT_REJECT;
3904 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3905 l2cap_send_sframe(pi, control);
3906 list_del(&l->list);
3907 list_add_tail(&l->list, SREJ_LIST(sk));
3908 }
3909}
3910
3911static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3912{
3913 struct l2cap_pinfo *pi = l2cap_pi(sk);
3914 struct srej_list *new;
3915 u16 control;
3916
3917 while (tx_seq != pi->expected_tx_seq) {
3918 control = L2CAP_SUPER_SELECT_REJECT;
3919 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3920 l2cap_send_sframe(pi, control);
3921
3922 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
8ff50ec0
GP		 3923 new->tx_seq = pi->expected_tx_seq;
3924 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3925 list_add_tail(&new->list, SREJ_LIST(sk));
3926 }
8ff50ec0 3927 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3928}
3929
1c2acffb
GP		 3930static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3931{
3932 struct l2cap_pinfo *pi = l2cap_pi(sk);
3933 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3934 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3935 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
f6337c77 3936 int tx_seq_offset, expected_tx_seq_offset;
803020c6 3937 int num_to_ack = (pi->tx_win/6) + 1;
1c2acffb
GP		 3938 int err = 0;
3939
0e98958d
GP		 3940 BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq,
3941 rx_control);
1c2acffb 3942
9b16dc65
GP		 3943 if (L2CAP_CTRL_FINAL & rx_control &&
3944 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
1d8f5d16
GP		 3945 del_timer(&pi->monitor_timer);
3946 if (pi->unacked_frames > 0)
3947 __mod_retrans_timer();
3948 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
3949 }
3950
9f121a5a
GP		 3951 pi->expected_ack_seq = req_seq;
3952 l2cap_drop_acked_frames(sk);
3953
8f17154f
GP		 3954 if (tx_seq == pi->expected_tx_seq)
3955 goto expected;
1c2acffb 3956
9b53350d
JPRV		 3957 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3958 if (tx_seq_offset < 0)
3959 tx_seq_offset += 64;
3960
3961 /* invalid tx_seq */
3962 if (tx_seq_offset >= pi->tx_win) {
9b108fc0 3963 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
9b53350d
JPRV		 3964 goto drop;
3965 }
3966
1890d36b
GP		 3967 if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY)
3968 goto drop;
3969
8f17154f
GP		 3970 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3971 struct srej_list *first;
30afb5b2 3972
8f17154f
GP		 3973 first = list_first_entry(SREJ_LIST(sk),
3974 struct srej_list, list);
3975 if (tx_seq == first->tx_seq) {
3976 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3977 l2cap_check_srej_gap(sk, tx_seq);
3978
3979 list_del(&first->list);
3980 kfree(first);
3981
3982 if (list_empty(SREJ_LIST(sk))) {
3983 pi->buffer_seq = pi->buffer_seq_srej;
3984 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
855666cc 3985 l2cap_send_ack(pi);
0e98958d 3986 BT_DBG("sk %p, Exit SREJ_SENT", sk);
8f17154f
GP		 3987 }
3988 } else {
3989 struct srej_list *l;
9b53350d
JPRV		 3990
3991 /* duplicated tx_seq */
3992 if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
3993 goto drop;
8f17154f
GP		 3994
3995 list_for_each_entry(l, SREJ_LIST(sk), list) {
3996 if (l->tx_seq == tx_seq) {
3997 l2cap_resend_srejframe(sk, tx_seq);
3998 return 0;
3999 }
4000 }
4001 l2cap_send_srejframe(sk, tx_seq);
30afb5b2
GP		 4002 }
4003 } else {
9b53350d
JPRV		 4004 expected_tx_seq_offset =
4005 (pi->expected_tx_seq - pi->buffer_seq) % 64;
4006 if (expected_tx_seq_offset < 0)
4007 expected_tx_seq_offset += 64;
4008
4009 /* duplicated tx_seq */
4010 if (tx_seq_offset < expected_tx_seq_offset)
4011 goto drop;
4012
8f17154f 4013 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 4014
0e98958d
GP		 4015 BT_DBG("sk %p, Enter SREJ", sk);
4016
8f17154f
GP		 4017 INIT_LIST_HEAD(SREJ_LIST(sk));
4018 pi->buffer_seq_srej = pi->buffer_seq;
4019
4020 __skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b 4021 __skb_queue_head_init(BUSY_QUEUE(sk));
8f17154f
GP		 4022 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
4023
ef54fd93
GP		 4024 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
4025
8f17154f 4026 l2cap_send_srejframe(sk, tx_seq);
7fe9b298
GP		 4027
4028 del_timer(&pi->ack_timer);
1c2acffb 4029 }
30afb5b2
GP		 4030 return 0;
4031
8f17154f
GP		 4032expected:
4033 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
4034
4035 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3b1a9f3f
GP		 4036 bt_cb(skb)->tx_seq = tx_seq;
4037 bt_cb(skb)->sar = sar;
4038 __skb_queue_tail(SREJ_QUEUE(sk), skb);
8f17154f
GP		 4039 return 0;
4040 }
4041
2ece3684
GP		 4042 err = l2cap_push_rx_skb(sk, skb, rx_control);
4043 if (err < 0)
4044 return 0;
4045
4ec10d97
GP		 4046 if (rx_control & L2CAP_CTRL_FINAL) {
4047 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4048 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4049 else
4050 l2cap_retransmit_frames(sk);
4ec10d97
GP		 4051 }
4052
c1b4f43b
GP		 4053 __mod_ack_timer();
4054
803020c6
GP		 4055 pi->num_acked = (pi->num_acked + 1) % num_to_ack;
4056 if (pi->num_acked == num_to_ack - 1)
9e917af1
GP		 4057 l2cap_send_ack(pi);
4058
8f17154f 4059 return 0;
9b53350d
JPRV		 4060
4061drop:
4062 kfree_skb(skb);
4063 return 0;
1c2acffb
GP		 4064}
4065
e072745f 4066static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
1c2acffb
GP		 4067{
4068 struct l2cap_pinfo *pi = l2cap_pi(sk);
6e3a5981 4069
0e98958d
GP		 4070 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control),
4071 rx_control);
4072
6e3a5981
GP		 4073 pi->expected_ack_seq = __get_reqseq(rx_control);
4074 l2cap_drop_acked_frames(sk);
1c2acffb 4075
e072745f 4076 if (rx_control & L2CAP_CTRL_POLL) {
3cb123d1 4077 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
05fbd89d
GP		 4078 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
4079 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4080 (pi->unacked_frames > 0))
4081 __mod_retrans_timer();
4082
4083 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4084 l2cap_send_srejtail(sk);
4085 } else {
4086 l2cap_send_i_or_rr_or_rnr(sk);
05fbd89d 4087 }
1d8f5d16 4088
e072745f
GP		 4089 } else if (rx_control & L2CAP_CTRL_FINAL) {
4090 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 4091
e072745f
GP		 4092 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4093 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4094 else
4095 l2cap_retransmit_frames(sk);
2246b2f1 4096
e072745f 4097 } else {
e072745f
GP		 4098 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4099 (pi->unacked_frames > 0))
4100 __mod_retrans_timer();
1c2acffb 4101
2246b2f1 4102 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
dfc909be 4103 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
e072745f 4104 l2cap_send_ack(pi);
dfc909be 4105 } else {
e072745f 4106 l2cap_ertm_send(sk);
dfc909be 4107 }
e072745f
GP		 4108 }
4109}
2246b2f1 4110
e072745f
GP		 4111static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
4112{
4113 struct l2cap_pinfo *pi = l2cap_pi(sk);
4114 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4115
0e98958d
GP		 4116 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4117
e072745f
GP		 4118 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4119
8abb52ee 4120 pi->expected_ack_seq = tx_seq;
e072745f
GP		 4121 l2cap_drop_acked_frames(sk);
4122
4123 if (rx_control & L2CAP_CTRL_FINAL) {
4124 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4125 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4126 else
4127 l2cap_retransmit_frames(sk);
e072745f 4128 } else {
dfc909be 4129 l2cap_retransmit_frames(sk);
30afb5b2 4130
0301ef04 4131 if (pi->conn_state & L2CAP_CONN_WAIT_F)
e072745f 4132 pi->conn_state |= L2CAP_CONN_REJ_ACT;
e072745f
GP		 4133 }
4134}
4135static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
4136{
4137 struct l2cap_pinfo *pi = l2cap_pi(sk);
4138 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4139
0e98958d
GP		 4140 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4141
e072745f 4142 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 4143
e072745f
GP		 4144 if (rx_control & L2CAP_CTRL_POLL) {
4145 pi->expected_ack_seq = tx_seq;
4146 l2cap_drop_acked_frames(sk);
3cb123d1
GP		 4147
4148 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
dfc909be
GP		 4149 l2cap_retransmit_one_frame(sk, tx_seq);
4150
e072745f 4151 l2cap_ertm_send(sk);
dfc909be 4152
e072745f
GP		 4153 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4154 pi->srej_save_reqseq = tx_seq;
4155 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4156 }
e072745f
GP		 4157 } else if (rx_control & L2CAP_CTRL_FINAL) {
4158 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
4159 pi->srej_save_reqseq == tx_seq)
4160 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
4161 else
dfc909be 4162 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f 4163 } else {
dfc909be 4164 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f
GP		 4165 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4166 pi->srej_save_reqseq = tx_seq;
4167 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4168 }
e072745f
GP		 4169 }
4170}
4171
4172static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
4173{
4174 struct l2cap_pinfo *pi = l2cap_pi(sk);
4175 u8 tx_seq = __get_reqseq(rx_control);
4176
0e98958d
GP		 4177 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4178
e072745f
GP		 4179 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
4180 pi->expected_ack_seq = tx_seq;
4181 l2cap_drop_acked_frames(sk);
4182
3cb123d1
GP		 4183 if (rx_control & L2CAP_CTRL_POLL)
4184 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
4185
99b0d4b7
GP		 4186 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
4187 del_timer(&pi->retrans_timer);
a2e12a2a
GP		 4188 if (rx_control & L2CAP_CTRL_POLL)
4189 l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL);
99b0d4b7 4190 return;
e072745f 4191 }
99b0d4b7
GP		 4192
4193 if (rx_control & L2CAP_CTRL_POLL)
4194 l2cap_send_srejtail(sk);
4195 else
4196 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
e072745f
GP		 4197}
4198
4199static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
4200{
4201 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
4202
9b16dc65
GP		 4203 if (L2CAP_CTRL_FINAL & rx_control &&
4204 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
e072745f
GP		 4205 del_timer(&l2cap_pi(sk)->monitor_timer);
4206 if (l2cap_pi(sk)->unacked_frames > 0)
4207 __mod_retrans_timer();
4208 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
4209 }
4210
4211 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
4212 case L2CAP_SUPER_RCV_READY:
4213 l2cap_data_channel_rrframe(sk, rx_control);
8f17154f
GP		 4214 break;
4215
e072745f
GP		 4216 case L2CAP_SUPER_REJECT:
4217 l2cap_data_channel_rejframe(sk, rx_control);
4218 break;
2246b2f1 4219
e072745f
GP		 4220 case L2CAP_SUPER_SELECT_REJECT:
4221 l2cap_data_channel_srejframe(sk, rx_control);
4222 break;
4223
4224 case L2CAP_SUPER_RCV_NOT_READY:
4225 l2cap_data_channel_rnrframe(sk, rx_control);
1c2acffb
GP		 4226 break;
4227 }
4228
faaebd19 4229 kfree_skb(skb);
1c2acffb
GP		 4230 return 0;
4231}
4232
218bb9df
GP		 4233static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
4234{
4235 struct l2cap_pinfo *pi = l2cap_pi(sk);
4236 u16 control;
4237 u8 req_seq;
4238 int len, next_tx_seq_offset, req_seq_offset;
4239
4240 control = get_unaligned_le16(skb->data);
4241 skb_pull(skb, 2);
4242 len = skb->len;
4243
4244 /*
4245 * We can just drop the corrupted I-frame here.
4246 * Receiver will miss it and start proper recovery
4247 * procedures and ask retransmission.
4248 */
4249 if (l2cap_check_fcs(pi, skb))
4250 goto drop;
4251
4252 if (__is_sar_start(control) && __is_iframe(control))
4253 len -= 2;
4254
4255 if (pi->fcs == L2CAP_FCS_CRC16)
4256 len -= 2;
4257
4258 if (len > pi->mps) {
4259 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4260 goto drop;
4261 }
4262
4263 req_seq = __get_reqseq(control);
4264 req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
4265 if (req_seq_offset < 0)
4266 req_seq_offset += 64;
4267
4268 next_tx_seq_offset =
4269 (pi->next_tx_seq - pi->expected_ack_seq) % 64;
4270 if (next_tx_seq_offset < 0)
4271 next_tx_seq_offset += 64;
4272
4273 /* check for invalid req-seq */
4274 if (req_seq_offset > next_tx_seq_offset) {
4275 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4276 goto drop;
4277 }
4278
4279 if (__is_iframe(control)) {
4280 if (len < 0) {
4281 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4282 goto drop;
4283 }
4284
4285 l2cap_data_channel_iframe(sk, control, skb);
4286 } else {
4287 if (len != 0) {
4288 BT_ERR("%d", len);
4289 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4290 goto drop;
4291 }
4292
4293 l2cap_data_channel_sframe(sk, control, skb);
4294 }
4295
4296 return 0;
4297
4298drop:
4299 kfree_skb(skb);
4300 return 0;
4301}
4302
1da177e4
LT		 4303static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4304{
4305 struct sock *sk;
6840ed07 4306 struct l2cap_pinfo *pi;
51893f88 4307 u16 control;
218bb9df
GP		 4308 u8 tx_seq;
4309 int len;
1da177e4
LT		 4310
4311 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
4312 if (!sk) {
4313 BT_DBG("unknown cid 0x%4.4x", cid);
4314 goto drop;
4315 }
4316
6840ed07
GP		 4317 pi = l2cap_pi(sk);
4318
1da177e4
LT		 4319 BT_DBG("sk %p, len %d", sk, skb->len);
4320
4321 if (sk->sk_state != BT_CONNECTED)
4322 goto drop;
4323
6840ed07 4324 switch (pi->mode) {
1c2acffb
GP		 4325 case L2CAP_MODE_BASIC:
4326 /* If socket recv buffers overflows we drop data here
4327 * which is *bad* because L2CAP has to be reliable.
4328 * But we don't have any other choice. L2CAP doesn't
4329 * provide flow control mechanism. */
1da177e4 4330
6840ed07 4331 if (pi->imtu < skb->len)
1c2acffb 4332 goto drop;
1da177e4 4333
1c2acffb
GP		 4334 if (!sock_queue_rcv_skb(sk, skb))
4335 goto done;
4336 break;
4337
4338 case L2CAP_MODE_ERTM:
218bb9df
GP		 4339 if (!sock_owned_by_user(sk)) {
4340 l2cap_ertm_data_rcv(sk, skb);
277ffbe3 4341 } else {
218bb9df 4342 if (sk_add_backlog(sk, skb))
277ffbe3 4343 goto drop;
277ffbe3 4344 }
1c2acffb 4345
fcafde2e 4346 goto done;
1c2acffb 4347
6840ed07
GP		 4348 case L2CAP_MODE_STREAMING:
4349 control = get_unaligned_le16(skb->data);
4350 skb_pull(skb, 2);
4351 len = skb->len;
4352
26000089
GP		 4353 if (l2cap_check_fcs(pi, skb))
4354 goto drop;
4355
6840ed07
GP		 4356 if (__is_sar_start(control))
4357 len -= 2;
4358
fcc203c3
GP		 4359 if (pi->fcs == L2CAP_FCS_CRC16)
4360 len -= 2;
4361
51893f88 4362 if (len > pi->mps || len < 0 || __is_sframe(control))
6840ed07
GP		 4363 goto drop;
4364
4365 tx_seq = __get_txseq(control);
4366
4367 if (pi->expected_tx_seq == tx_seq)
4368 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
4369 else
7dffe421 4370 pi->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 4371
18778a63 4372 l2cap_streaming_reassembly_sdu(sk, skb, control);
6840ed07
GP		 4373
4374 goto done;
4375
1c2acffb 4376 default:
e8235c6b 4377 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
1c2acffb
GP		 4378 break;
4379 }
1da177e4
LT		 4380
4381drop:
4382 kfree_skb(skb);
4383
4384done:
0139418c
MH		 4385 if (sk)
4386 bh_unlock_sock(sk);
4387
1da177e4
LT		 4388 return 0;
4389}
4390
8e036fc3 4391static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4
LT		 4392{
4393 struct sock *sk;
4394
4395 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
4396 if (!sk)
4397 goto drop;
4398
4399 BT_DBG("sk %p, len %d", sk, skb->len);
4400
4401 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
4402 goto drop;
4403
4404 if (l2cap_pi(sk)->imtu < skb->len)
4405 goto drop;
4406
4407 if (!sock_queue_rcv_skb(sk, skb))
4408 goto done;
4409
4410drop:
4411 kfree_skb(skb);
4412
4413done:
af05b30b
GP		 4414 if (sk)
4415 bh_unlock_sock(sk);
1da177e4
LT		 4416 return 0;
4417}
4418
4419static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4420{
4421 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4422 u16 cid, len;
4423 __le16 psm;
1da177e4
LT		 4424
4425 skb_pull(skb, L2CAP_HDR_SIZE);
4426 cid = __le16_to_cpu(lh->cid);
4427 len = __le16_to_cpu(lh->len);
4428
1c2acffb
GP		 4429 if (len != skb->len) {
4430 kfree_skb(skb);
4431 return;
4432 }
4433
1da177e4
LT		 4434 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4435
4436 switch (cid) {
8db4dc46 4437 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4438 l2cap_sig_channel(conn, skb);
4439 break;
4440
8db4dc46 4441 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4442 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4443 skb_pull(skb, 2);
4444 l2cap_conless_channel(conn, psm, skb);
4445 break;
4446
4447 default:
4448 l2cap_data_channel(conn, cid, skb);
4449 break;
4450 }
4451}
4452
4453/* ---- L2CAP interface with lower layer (HCI) ---- */
4454
4455static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
4456{
4457 int exact = 0, lm1 = 0, lm2 = 0;
4458 register struct sock *sk;
4459 struct hlist_node *node;
4460
4461 if (type != ACL_LINK)
963cf687 4462 return -EINVAL;
1da177e4
LT		 4463
4464 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4465
4466 /* Find listening sockets and check their link_mode */
4467 read_lock(&l2cap_sk_list.lock);
4468 sk_for_each(sk, node, &l2cap_sk_list.head) {
4469 if (sk->sk_state != BT_LISTEN)
4470 continue;
4471
4472 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5
MH		 4473 lm1 |= HCI_LM_ACCEPT;
4474 if (l2cap_pi(sk)->role_switch)
4475 lm1 |= HCI_LM_MASTER;
1da177e4 4476 exact++;
2af6b9d5
MH		 4477 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4478 lm2 |= HCI_LM_ACCEPT;
4479 if (l2cap_pi(sk)->role_switch)
4480 lm2 |= HCI_LM_MASTER;
4481 }
1da177e4
LT		 4482 }
4483 read_unlock(&l2cap_sk_list.lock);
4484
4485 return exact ? lm1 : lm2;
4486}
4487
4488static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
4489{
0139418c
MH		 4490 struct l2cap_conn *conn;
4491
1da177e4
LT		 4492 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4493
4494 if (hcon->type != ACL_LINK)
963cf687 4495 return -EINVAL;
1da177e4
LT		 4496
4497 if (!status) {
1da177e4
LT		 4498 conn = l2cap_conn_add(hcon, status);
4499 if (conn)
4500 l2cap_conn_ready(conn);
0139418c 4501 } else
1da177e4
LT		 4502 l2cap_conn_del(hcon, bt_err(status));
4503
4504 return 0;
4505}
4506
2950f21a
MH		 4507static int l2cap_disconn_ind(struct hci_conn *hcon)
4508{
4509 struct l2cap_conn *conn = hcon->l2cap_data;
4510
4511 BT_DBG("hcon %p", hcon);
4512
4513 if (hcon->type != ACL_LINK || !conn)
4514 return 0x13;
4515
4516 return conn->disc_reason;
4517}
4518
4519static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4520{
4521 BT_DBG("hcon %p reason %d", hcon, reason);
4522
4523 if (hcon->type != ACL_LINK)
963cf687 4524 return -EINVAL;
1da177e4
LT		 4525
4526 l2cap_conn_del(hcon, bt_err(reason));
0139418c 4527
1da177e4
LT		 4528 return 0;
4529}
4530
f62e4323
MH		 4531static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
4532{
bd3c9e25 4533 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
255c7601
MH		 4534 return;
4535
f62e4323
MH		 4536 if (encrypt == 0x00) {
4537 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
4538 l2cap_sock_clear_timer(sk);
4539 l2cap_sock_set_timer(sk, HZ * 5);
4540 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
4541 __l2cap_sock_close(sk, ECONNREFUSED);
4542 } else {
4543 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
4544 l2cap_sock_clear_timer(sk);
4545 }
4546}
4547
8c1b2355 4548static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4
LT		 4549{
4550 struct l2cap_chan_list *l;
0139418c 4551 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 4552 struct sock *sk;
1da177e4 4553
0139418c 4554 if (!conn)
1da177e4 4555 return 0;
0139418c 4556
1da177e4
LT		 4557 l = &conn->chan_list;
4558
4559 BT_DBG("conn %p", conn);
4560
4561 read_lock(&l->lock);
4562
4563 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
4564 bh_lock_sock(sk);
4565
6a8d3010
MH		 4566 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
4567 bh_unlock_sock(sk);
4568 continue;
4569 }
4570
f62e4323 4571 if (!status && (sk->sk_state == BT_CONNECTED ||
8c1b2355 4572 sk->sk_state == BT_CONFIG)) {
f62e4323 4573 l2cap_check_encryption(sk, encrypt);
9719f8af
MH		 4574 bh_unlock_sock(sk);
4575 continue;
4576 }
4577
b1235d79
MH		 4578 if (sk->sk_state == BT_CONNECT) {
4579 if (!status) {
4580 struct l2cap_conn_req req;
4581 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
4582 req.psm = l2cap_pi(sk)->psm;
1da177e4 4583
b1235d79 4584 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
e501d055 4585 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4 4586
b1235d79
MH		 4587 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4588 L2CAP_CONN_REQ, sizeof(req), &req);
4589 } else {
4590 l2cap_sock_clear_timer(sk);
4591 l2cap_sock_set_timer(sk, HZ / 10);
4592 }
4593 } else if (sk->sk_state == BT_CONNECT2) {
4594 struct l2cap_conn_rsp rsp;
4595 __u16 result;
1da177e4 4596
b1235d79
MH		 4597 if (!status) {
4598 sk->sk_state = BT_CONFIG;
4599 result = L2CAP_CR_SUCCESS;
4600 } else {
4601 sk->sk_state = BT_DISCONN;
4602 l2cap_sock_set_timer(sk, HZ / 10);
4603 result = L2CAP_CR_SEC_BLOCK;
4604 }
4605
4606 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
4607 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
4608 rsp.result = cpu_to_le16(result);
e7c29cb1 4609 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
b1235d79
MH		 4610 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4611 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4612 }
1da177e4
LT		 4613
4614 bh_unlock_sock(sk);
4615 }
4616
4617 read_unlock(&l->lock);
b1235d79 4618
1da177e4
LT		 4619 return 0;
4620}
4621
4622static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4623{
4624 struct l2cap_conn *conn = hcon->l2cap_data;
4625
4626 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4627 goto drop;
4628
4629 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4630
4631 if (flags & ACL_START) {
4632 struct l2cap_hdr *hdr;
4633 int len;
4634
4635 if (conn->rx_len) {
4636 BT_ERR("Unexpected start frame (len %d)", skb->len);
4637 kfree_skb(conn->rx_skb);
4638 conn->rx_skb = NULL;
4639 conn->rx_len = 0;
4640 l2cap_conn_unreliable(conn, ECOMM);
4641 }
4642
4643 if (skb->len < 2) {
4644 BT_ERR("Frame is too short (len %d)", skb->len);
4645 l2cap_conn_unreliable(conn, ECOMM);
4646 goto drop;
4647 }
4648
4649 hdr = (struct l2cap_hdr *) skb->data;
4650 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4651
4652 if (len == skb->len) {
4653 /* Complete frame received */
4654 l2cap_recv_frame(conn, skb);
4655 return 0;
4656 }
4657
4658 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4659
4660 if (skb->len > len) {
4661 BT_ERR("Frame is too long (len %d, expected len %d)",
4662 skb->len, len);
4663 l2cap_conn_unreliable(conn, ECOMM);
4664 goto drop;
4665 }
4666
4667 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4668 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4669 if (!conn->rx_skb)
1da177e4
LT		 4670 goto drop;
4671
d626f62b 4672 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4673 skb->len);
1da177e4
LT		 4674 conn->rx_len = len - skb->len;
4675 } else {
4676 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4677
4678 if (!conn->rx_len) {
4679 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4680 l2cap_conn_unreliable(conn, ECOMM);
4681 goto drop;
4682 }
4683
4684 if (skb->len > conn->rx_len) {
4685 BT_ERR("Fragment is too long (len %d, expected %d)",
4686 skb->len, conn->rx_len);
4687 kfree_skb(conn->rx_skb);
4688 conn->rx_skb = NULL;
4689 conn->rx_len = 0;
4690 l2cap_conn_unreliable(conn, ECOMM);
4691 goto drop;
4692 }
4693
d626f62b 4694 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4695 skb->len);
1da177e4
LT		 4696 conn->rx_len -= skb->len;
4697
4698 if (!conn->rx_len) {
4699 /* Complete frame received */
4700 l2cap_recv_frame(conn, conn->rx_skb);
4701 conn->rx_skb = NULL;
4702 }
4703 }
4704
4705drop:
4706 kfree_skb(skb);
4707 return 0;
4708}
4709
aef7d97c 4710static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4
LT		 4711{
4712 struct sock *sk;
4713 struct hlist_node *node;
1da177e4
LT		 4714
4715 read_lock_bh(&l2cap_sk_list.lock);
4716
be9d1227
MH		 4717 sk_for_each(sk, node, &l2cap_sk_list.head) {
4718 struct l2cap_pinfo *pi = l2cap_pi(sk);
101545f6 4719
aef7d97c
MH		 4720 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4721 batostr(&bt_sk(sk)->src),
4722 batostr(&bt_sk(sk)->dst),
4723 sk->sk_state, __le16_to_cpu(pi->psm),
4724 pi->scid, pi->dcid,
4725 pi->imtu, pi->omtu, pi->sec_level);
be9d1227 4726 }
1da177e4 4727
1da177e4 4728 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 4729
aef7d97c 4730 return 0;
1da177e4
LT		 4731}
4732
aef7d97c
MH		 4733static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4734{
4735 return single_open(file, l2cap_debugfs_show, inode->i_private);
4736}
4737
4738static const struct file_operations l2cap_debugfs_fops = {
4739 .open = l2cap_debugfs_open,
4740 .read = seq_read,
4741 .llseek = seq_lseek,
4742 .release = single_release,
4743};
4744
4745static struct dentry *l2cap_debugfs;
1da177e4 4746
90ddc4f0 4747static const struct proto_ops l2cap_sock_ops = {
1da177e4
LT		 4748 .family = PF_BLUETOOTH,
4749 .owner = THIS_MODULE,
4750 .release = l2cap_sock_release,
4751 .bind = l2cap_sock_bind,
4752 .connect = l2cap_sock_connect,
4753 .listen = l2cap_sock_listen,
4754 .accept = l2cap_sock_accept,
4755 .getname = l2cap_sock_getname,
4756 .sendmsg = l2cap_sock_sendmsg,
f66dc81f 4757 .recvmsg = l2cap_sock_recvmsg,
1da177e4 4758 .poll = bt_sock_poll,
3241ad82 4759 .ioctl = bt_sock_ioctl,
1da177e4
LT		 4760 .mmap = sock_no_mmap,
4761 .socketpair = sock_no_socketpair,
1da177e4
LT		 4762 .shutdown = l2cap_sock_shutdown,
4763 .setsockopt = l2cap_sock_setsockopt,
4764 .getsockopt = l2cap_sock_getsockopt
4765};
4766
ec1b4cf7 4767static const struct net_proto_family l2cap_sock_family_ops = {
1da177e4
LT		 4768 .family = PF_BLUETOOTH,
4769 .owner = THIS_MODULE,
4770 .create = l2cap_sock_create,
4771};
4772
4773static struct hci_proto l2cap_hci_proto = {
4774 .name = "L2CAP",
4775 .id = HCI_PROTO_L2CAP,
4776 .connect_ind = l2cap_connect_ind,
4777 .connect_cfm = l2cap_connect_cfm,
4778 .disconn_ind = l2cap_disconn_ind,
2950f21a 4779 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4780 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4781 .recv_acldata = l2cap_recv_acldata
4782};
4783
4784static int __init l2cap_init(void)
4785{
4786 int err;
be9d1227 4787
1da177e4
LT		 4788 err = proto_register(&l2cap_proto, 0);
4789 if (err < 0)
4790 return err;
4791
1890d36b
GP		 4792 _busy_wq = create_singlethread_workqueue("l2cap");
4793 if (!_busy_wq)
4794 goto error;
4795
1da177e4
LT		 4796 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4797 if (err < 0) {
4798 BT_ERR("L2CAP socket registration failed");
4799 goto error;
4800 }
4801
4802 err = hci_register_proto(&l2cap_hci_proto);
4803 if (err < 0) {
4804 BT_ERR("L2CAP protocol registration failed");
4805 bt_sock_unregister(BTPROTO_L2CAP);
4806 goto error;
4807 }
4808
aef7d97c
MH		 4809 if (bt_debugfs) {
4810 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4811 bt_debugfs, NULL, &l2cap_debugfs_fops);
4812 if (!l2cap_debugfs)
4813 BT_ERR("Failed to create L2CAP debug file");
4814 }
1da177e4
LT		 4815
4816 BT_INFO("L2CAP ver %s", VERSION);
4817 BT_INFO("L2CAP socket layer initialized");
4818
4819 return 0;
4820
4821error:
4822 proto_unregister(&l2cap_proto);
4823 return err;
4824}
4825
4826static void __exit l2cap_exit(void)
4827{
aef7d97c 4828 debugfs_remove(l2cap_debugfs);
1da177e4 4829
1890d36b
GP		 4830 flush_workqueue(_busy_wq);
4831 destroy_workqueue(_busy_wq);
4832
1da177e4
LT		 4833 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4834 BT_ERR("L2CAP socket unregistration failed");
4835
4836 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4837 BT_ERR("L2CAP protocol unregistration failed");
4838
4839 proto_unregister(&l2cap_proto);
4840}
4841
4842void l2cap_load(void)
4843{
4844 /* Dummy function to trigger automatic L2CAP module loading by
4845 * other modules that use L2CAP sockets but don't use any other
4846 * symbols from it. */
1da177e4
LT		 4847}
4848EXPORT_SYMBOL(l2cap_load);
4849
4850module_init(l2cap_init);
4851module_exit(l2cap_exit);
4852
44dd46de
MH		 4853module_param(enable_ertm, bool, 0644);
4854MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
4855
63fbd24e 4856MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 4857MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4858MODULE_VERSION(VERSION);
4859MODULE_LICENSE("GPL");
4860MODULE_ALIAS("bt-proto-0");
kernel source for telekom puls (alcatel/mediatek)