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igbvf.txt: Add igbvf Documentation
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / l2cap.c
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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 59
d1c4a17d 60static int disable_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;
d1c4a17d 467 if (!disable_ertm)
cf6c2c0b
GP		 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;
d1c4a17d 906 if (!disable_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:
d1c4a17d 1163 if (!disable_ertm)
c6b03cf9
MH		 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:
d1c4a17d 1229 if (!disable_ertm)
c6b03cf9
MH		 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:
d1c4a17d 1989 if (!disable_ertm)
0041ecfa
JPRV		 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 2529
63406504
GP		 2530 if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2531 !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING))
2532 break;
2533
62547752
GP		 2534 rfc.mode = L2CAP_MODE_BASIC;
2535 rfc.txwin_size = 0;
2536 rfc.max_transmit = 0;
2537 rfc.retrans_timeout = 0;
2538 rfc.monitor_timeout = 0;
2539 rfc.max_pdu_size = 0;
2540
63406504
GP		 2541 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2542 (unsigned long) &rfc);
65c7c491
MH		 2543 break;
2544
2545 case L2CAP_MODE_ERTM:
2546 rfc.mode = L2CAP_MODE_ERTM;
14b5aa71 2547 rfc.txwin_size = pi->tx_win;
68d7f0ce 2548 rfc.max_transmit = pi->max_tx;
f2fcfcd6
GP		 2549 rfc.retrans_timeout = 0;
2550 rfc.monitor_timeout = 0;
c74e560c 2551 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2552 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2553 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
f2fcfcd6 2554
63406504
GP		 2555 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2556 (unsigned long) &rfc);
2557
fcc203c3
GP		 2558 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2559 break;
2560
2561 if (pi->fcs == L2CAP_FCS_NONE ||
2562 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2563 pi->fcs = L2CAP_FCS_NONE;
2564 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2565 }
f2fcfcd6
GP		 2566 break;
2567
2568 case L2CAP_MODE_STREAMING:
2569 rfc.mode = L2CAP_MODE_STREAMING;
2570 rfc.txwin_size = 0;
2571 rfc.max_transmit = 0;
2572 rfc.retrans_timeout = 0;
2573 rfc.monitor_timeout = 0;
c74e560c 2574 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2575 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2576 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
65c7c491 2577
63406504
GP		 2578 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2579 (unsigned long) &rfc);
2580
fcc203c3
GP		 2581 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2582 break;
2583
2584 if (pi->fcs == L2CAP_FCS_NONE ||
2585 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2586 pi->fcs = L2CAP_FCS_NONE;
2587 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2588 }
65c7c491
MH		 2589 break;
2590 }
1da177e4
LT		 2591
2592 /* FIXME: Need actual value of the flush timeout */
2593 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2594 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2595
aca3192c
YH		 2596 req->dcid = cpu_to_le16(pi->dcid);
2597 req->flags = cpu_to_le16(0);
1da177e4
LT		 2598
2599 return ptr - data;
2600}
2601
5dee9e7c 2602static int l2cap_parse_conf_req(struct sock *sk, void *data)
1da177e4
LT		 2603{
2604 struct l2cap_pinfo *pi = l2cap_pi(sk);
5dee9e7c
MH		 2605 struct l2cap_conf_rsp *rsp = data;
2606 void *ptr = rsp->data;
2607 void *req = pi->conf_req;
2608 int len = pi->conf_len;
2609 int type, hint, olen;
2610 unsigned long val;
6464f35f 2611 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 2612 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2613 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2614
5dee9e7c 2615 BT_DBG("sk %p", sk);
820ae1b8 2616
5dee9e7c
MH		 2617 while (len >= L2CAP_CONF_OPT_SIZE) {
2618 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2619
589d2746 2620 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2621 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2622
2623 switch (type) {
2624 case L2CAP_CONF_MTU:
861d6882 2625 mtu = val;
5dee9e7c
MH		 2626 break;
2627
2628 case L2CAP_CONF_FLUSH_TO:
2629 pi->flush_to = val;
2630 break;
2631
2632 case L2CAP_CONF_QOS:
2633 break;
2634
6464f35f
MH		 2635 case L2CAP_CONF_RFC:
2636 if (olen == sizeof(rfc))
2637 memcpy(&rfc, (void *) val, olen);
2638 break;
2639
fcc203c3
GP		 2640 case L2CAP_CONF_FCS:
2641 if (val == L2CAP_FCS_NONE)
2642 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2643
2644 break;
2645
5dee9e7c
MH		 2646 default:
2647 if (hint)
2648 break;
2649
2650 result = L2CAP_CONF_UNKNOWN;
2651 *((u8 *) ptr++) = type;
2652 break;
2653 }
2654 }
2655
e9aeb2dd 2656 if (pi->num_conf_rsp || pi->num_conf_req > 1)
f2fcfcd6
GP		 2657 goto done;
2658
2659 switch (pi->mode) {
2660 case L2CAP_MODE_STREAMING:
2661 case L2CAP_MODE_ERTM:
85eb53c6
GP		 2662 if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
2663 pi->mode = l2cap_select_mode(rfc.mode,
2664 pi->conn->feat_mask);
2665 break;
2666 }
2667
742e519b 2668 if (pi->mode != rfc.mode)
f2fcfcd6 2669 return -ECONNREFUSED;
742e519b 2670
f2fcfcd6 2671 break;
f2fcfcd6
GP		 2672 }
2673
2674done:
2675 if (pi->mode != rfc.mode) {
2676 result = L2CAP_CONF_UNACCEPT;
2677 rfc.mode = pi->mode;
2678
2679 if (pi->num_conf_rsp == 1)
2680 return -ECONNREFUSED;
2681
2682 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2683 sizeof(rfc), (unsigned long) &rfc);
2684 }
2685
2686
5dee9e7c
MH		 2687 if (result == L2CAP_CONF_SUCCESS) {
2688 /* Configure output options and let the other side know
2689 * which ones we don't like. */
2690
f2fcfcd6
GP		 2691 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2692 result = L2CAP_CONF_UNACCEPT;
2693 else {
2694 pi->omtu = mtu;
2695 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2696 }
2697 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
6464f35f 2698
f2fcfcd6
GP		 2699 switch (rfc.mode) {
2700 case L2CAP_MODE_BASIC:
2701 pi->fcs = L2CAP_FCS_NONE;
2702 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2703 break;
2704
2705 case L2CAP_MODE_ERTM:
2706 pi->remote_tx_win = rfc.txwin_size;
2707 pi->remote_max_tx = rfc.max_transmit;
1c762159
GP		 2708 if (rfc.max_pdu_size > pi->conn->mtu - 10)
2709 rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
2710
2711 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6 2712
10467e9e
GP		 2713 rfc.retrans_timeout =
2714 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2715 rfc.monitor_timeout =
2716 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6
GP		 2717
2718 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2719
2720 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2721 sizeof(rfc), (unsigned long) &rfc);
2722
f2fcfcd6
GP		 2723 break;
2724
2725 case L2CAP_MODE_STREAMING:
1c762159
GP		 2726 if (rfc.max_pdu_size > pi->conn->mtu - 10)
2727 rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
2728
2729 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2730
2731 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2732
2733 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2734 sizeof(rfc), (unsigned long) &rfc);
2735
f2fcfcd6
GP		 2736 break;
2737
2738 default:
5dee9e7c 2739 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2740
6464f35f 2741 memset(&rfc, 0, sizeof(rfc));
f2fcfcd6
GP		 2742 rfc.mode = pi->mode;
2743 }
6464f35f 2744
f2fcfcd6
GP		 2745 if (result == L2CAP_CONF_SUCCESS)
2746 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2747 }
5dee9e7c
MH		 2748 rsp->scid = cpu_to_le16(pi->dcid);
2749 rsp->result = cpu_to_le16(result);
2750 rsp->flags = cpu_to_le16(0x0000);
2751
2752 return ptr - data;
1da177e4
LT		 2753}
2754
f2fcfcd6
GP		 2755static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2756{
2757 struct l2cap_pinfo *pi = l2cap_pi(sk);
2758 struct l2cap_conf_req *req = data;
2759 void *ptr = req->data;
2760 int type, olen;
2761 unsigned long val;
2762 struct l2cap_conf_rfc rfc;
2763
2764 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2765
2766 while (len >= L2CAP_CONF_OPT_SIZE) {
2767 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2768
2769 switch (type) {
2770 case L2CAP_CONF_MTU:
2771 if (val < L2CAP_DEFAULT_MIN_MTU) {
2772 *result = L2CAP_CONF_UNACCEPT;
2773 pi->omtu = L2CAP_DEFAULT_MIN_MTU;
2774 } else
2775 pi->omtu = val;
2776 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2777 break;
2778
2779 case L2CAP_CONF_FLUSH_TO:
2780 pi->flush_to = val;
2781 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2782 2, pi->flush_to);
2783 break;
2784
2785 case L2CAP_CONF_RFC:
2786 if (olen == sizeof(rfc))
2787 memcpy(&rfc, (void *)val, olen);
2788
2789 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2790 rfc.mode != pi->mode)
2791 return -ECONNREFUSED;
2792
f2fcfcd6
GP		 2793 pi->fcs = 0;
2794
2795 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2796 sizeof(rfc), (unsigned long) &rfc);
2797 break;
2798 }
2799 }
2800
6c2ea7a8
GP		 2801 if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode)
2802 return -ECONNREFUSED;
2803
2804 pi->mode = rfc.mode;
2805
f2fcfcd6
GP		 2806 if (*result == L2CAP_CONF_SUCCESS) {
2807 switch (rfc.mode) {
2808 case L2CAP_MODE_ERTM:
2809 pi->remote_tx_win = rfc.txwin_size;
10467e9e
GP		 2810 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2811 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
1c762159 2812 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2813 break;
2814 case L2CAP_MODE_STREAMING:
1c762159 2815 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2816 }
2817 }
2818
2819 req->dcid = cpu_to_le16(pi->dcid);
2820 req->flags = cpu_to_le16(0x0000);
2821
2822 return ptr - data;
2823}
2824
5dee9e7c 2825static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1da177e4
LT		 2826{
2827 struct l2cap_conf_rsp *rsp = data;
2828 void *ptr = rsp->data;
1da177e4 2829
5dee9e7c 2830 BT_DBG("sk %p", sk);
1da177e4 2831
aca3192c 2832 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
5dee9e7c 2833 rsp->result = cpu_to_le16(result);
aca3192c 2834 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2835
2836 return ptr - data;
2837}
2838
7b1c0049
GP		 2839static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
2840{
2841 struct l2cap_pinfo *pi = l2cap_pi(sk);
2842 int type, olen;
2843 unsigned long val;
2844 struct l2cap_conf_rfc rfc;
2845
2846 BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
2847
2848 if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
2849 return;
2850
2851 while (len >= L2CAP_CONF_OPT_SIZE) {
2852 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2853
2854 switch (type) {
2855 case L2CAP_CONF_RFC:
2856 if (olen == sizeof(rfc))
2857 memcpy(&rfc, (void *)val, olen);
2858 goto done;
2859 }
2860 }
2861
2862done:
2863 switch (rfc.mode) {
2864 case L2CAP_MODE_ERTM:
2865 pi->remote_tx_win = rfc.txwin_size;
10467e9e
GP		 2866 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2867 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
7b1c0049
GP		 2868 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2869 break;
2870 case L2CAP_MODE_STREAMING:
2871 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2872 }
2873}
2874
4e8402a3
MH		 2875static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2876{
2877 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2878
2879 if (rej->reason != 0x0000)
2880 return 0;
2881
2882 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2883 cmd->ident == conn->info_ident) {
4e8402a3 2884 del_timer(&conn->info_timer);
984947dc
MH		 2885
2886 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2887 conn->info_ident = 0;
984947dc 2888
4e8402a3
MH		 2889 l2cap_conn_start(conn);
2890 }
2891
2892 return 0;
2893}
2894
1da177e4
LT		 2895static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2896{
2897 struct l2cap_chan_list *list = &conn->chan_list;
2898 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2899 struct l2cap_conn_rsp rsp;
e9aeb2dd 2900 struct sock *parent, *uninitialized_var(sk);
e7c29cb1 2901 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2902
2903 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2904 __le16 psm = req->psm;
1da177e4
LT		 2905
2906 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2907
2908 /* Check if we have socket listening on psm */
2909 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2910 if (!parent) {
2911 result = L2CAP_CR_BAD_PSM;
2912 goto sendresp;
2913 }
2914
e7c29cb1
MH		 2915 /* Check if the ACL is secure enough (if not SDP) */
2916 if (psm != cpu_to_le16(0x0001) &&
2917 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2918 conn->disc_reason = 0x05;
e7c29cb1
MH		 2919 result = L2CAP_CR_SEC_BLOCK;
2920 goto response;
2921 }
2922
1da177e4
LT		 2923 result = L2CAP_CR_NO_MEM;
2924
2925 /* Check for backlog size */
2926 if (sk_acceptq_is_full(parent)) {
8e87d142 2927 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2928 goto response;
2929 }
2930
3b1e0a65 2931 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1da177e4
LT		 2932 if (!sk)
2933 goto response;
2934
fd1278d7 2935 write_lock_bh(&list->lock);
1da177e4
LT		 2936
2937 /* Check if we already have channel with that dcid */
2938 if (__l2cap_get_chan_by_dcid(list, scid)) {
fd1278d7 2939 write_unlock_bh(&list->lock);
1da177e4
LT		 2940 sock_set_flag(sk, SOCK_ZAPPED);
2941 l2cap_sock_kill(sk);
2942 goto response;
2943 }
2944
2945 hci_conn_hold(conn->hcon);
2946
2947 l2cap_sock_init(sk, parent);
2948 bacpy(&bt_sk(sk)->src, conn->src);
2949 bacpy(&bt_sk(sk)->dst, conn->dst);
2950 l2cap_pi(sk)->psm = psm;
2951 l2cap_pi(sk)->dcid = scid;
2952
2953 __l2cap_chan_add(conn, sk, parent);
2954 dcid = l2cap_pi(sk)->scid;
2955
2956 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2957
1da177e4
LT		 2958 l2cap_pi(sk)->ident = cmd->ident;
2959
984947dc 2960 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2af6b9d5 2961 if (l2cap_check_security(sk)) {
f66dc81f
MH		 2962 if (bt_sk(sk)->defer_setup) {
2963 sk->sk_state = BT_CONNECT2;
2964 result = L2CAP_CR_PEND;
2965 status = L2CAP_CS_AUTHOR_PEND;
2966 parent->sk_data_ready(parent, 0);
2967 } else {
2968 sk->sk_state = BT_CONFIG;
2969 result = L2CAP_CR_SUCCESS;
2970 status = L2CAP_CS_NO_INFO;
2971 }
79d554a6
MH		 2972 } else {
2973 sk->sk_state = BT_CONNECT2;
2974 result = L2CAP_CR_PEND;
2975 status = L2CAP_CS_AUTHEN_PEND;
2976 }
2977 } else {
2978 sk->sk_state = BT_CONNECT2;
2979 result = L2CAP_CR_PEND;
2980 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2981 }
2982
fd1278d7 2983 write_unlock_bh(&list->lock);
1da177e4
LT		 2984
2985response:
2986 bh_unlock_sock(parent);
2987
2988sendresp:
aca3192c
YH		 2989 rsp.scid = cpu_to_le16(scid);
2990 rsp.dcid = cpu_to_le16(dcid);
2991 rsp.result = cpu_to_le16(result);
2992 rsp.status = cpu_to_le16(status);
1da177e4 2993 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2994
2995 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2996 struct l2cap_info_req info;
2997 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2998
2999 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3000 conn->info_ident = l2cap_get_ident(conn);
3001
3002 mod_timer(&conn->info_timer, jiffies +
3003 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
3004
3005 l2cap_send_cmd(conn, conn->info_ident,
3006 L2CAP_INFO_REQ, sizeof(info), &info);
3007 }
3008
e9aeb2dd
GP		 3009 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) &&
3010 result == L2CAP_CR_SUCCESS) {
3011 u8 buf[128];
3012 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
3013 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3014 l2cap_build_conf_req(sk, buf), buf);
3015 l2cap_pi(sk)->num_conf_req++;
3016 }
3017
1da177e4
LT		 3018 return 0;
3019}
3020
3021static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3022{
3023 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3024 u16 scid, dcid, result, status;
3025 struct sock *sk;
3026 u8 req[128];
3027
3028 scid = __le16_to_cpu(rsp->scid);
3029 dcid = __le16_to_cpu(rsp->dcid);
3030 result = __le16_to_cpu(rsp->result);
3031 status = __le16_to_cpu(rsp->status);
3032
3033 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
3034
3035 if (scid) {
af05b30b
GP		 3036 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3037 if (!sk)
57d3b22b 3038 return -EFAULT;
1da177e4 3039 } else {
af05b30b
GP		 3040 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
3041 if (!sk)
57d3b22b 3042 return -EFAULT;
1da177e4
LT		 3043 }
3044
3045 switch (result) {
3046 case L2CAP_CR_SUCCESS:
3047 sk->sk_state = BT_CONFIG;
3048 l2cap_pi(sk)->ident = 0;
3049 l2cap_pi(sk)->dcid = dcid;
6a8d3010
MH		 3050 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
3051
e9aeb2dd
GP		 3052 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)
3053 break;
3054
3055 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
3056
1da177e4
LT		 3057 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3058 l2cap_build_conf_req(sk, req), req);
f2fcfcd6 3059 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3060 break;
3061
3062 case L2CAP_CR_PEND:
6a8d3010 3063 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 3064 break;
3065
3066 default:
3067 l2cap_chan_del(sk, ECONNREFUSED);
3068 break;
3069 }
3070
3071 bh_unlock_sock(sk);
3072 return 0;
3073}
3074
88219a0f 3075static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3076{
3077 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3078 u16 dcid, flags;
3079 u8 rsp[64];
3080 struct sock *sk;
5dee9e7c 3081 int len;
1da177e4
LT		 3082
3083 dcid = __le16_to_cpu(req->dcid);
3084 flags = __le16_to_cpu(req->flags);
3085
3086 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3087
af05b30b
GP		 3088 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3089 if (!sk)
1da177e4
LT		 3090 return -ENOENT;
3091
8cb8e6f1
GP		 3092 if (sk->sk_state != BT_CONFIG) {
3093 struct l2cap_cmd_rej rej;
3094
3095 rej.reason = cpu_to_le16(0x0002);
3096 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
3097 sizeof(rej), &rej);
354f60a9 3098 goto unlock;
8cb8e6f1 3099 }
354f60a9 3100
5dee9e7c 3101 /* Reject if config buffer is too small. */
88219a0f 3102 len = cmd_len - sizeof(*req);
5dee9e7c
MH		 3103 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
3104 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3105 l2cap_build_conf_rsp(sk, rsp,
3106 L2CAP_CONF_REJECT, flags), rsp);
3107 goto unlock;
3108 }
3109
3110 /* Store config. */
3111 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
3112 l2cap_pi(sk)->conf_len += len;
1da177e4
LT		 3113
3114 if (flags & 0x0001) {
3115 /* Incomplete config. Send empty response. */
3116 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
5dee9e7c
MH		 3117 l2cap_build_conf_rsp(sk, rsp,
3118 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 3119 goto unlock;
3120 }
3121
3122 /* Complete config. */
5dee9e7c 3123 len = l2cap_parse_conf_req(sk, rsp);
f2fcfcd6 3124 if (len < 0) {
9b108fc0 3125 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4 3126 goto unlock;
f2fcfcd6 3127 }
1da177e4 3128
5dee9e7c 3129 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
f2fcfcd6 3130 l2cap_pi(sk)->num_conf_rsp++;
5dee9e7c 3131
5dee9e7c
MH		 3132 /* Reset config buffer. */
3133 l2cap_pi(sk)->conf_len = 0;
3134
876d9484
MH		 3135 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
3136 goto unlock;
3137
1da177e4 3138 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
f64f9e71
JP		 3139 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
3140 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 3141 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
3142
1da177e4 3143 sk->sk_state = BT_CONNECTED;
e90bac06 3144
0565c1c2
GP		 3145 l2cap_pi(sk)->next_tx_seq = 0;
3146 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3147 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3148 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3149 l2cap_ertm_init(sk);
3150
1da177e4 3151 l2cap_chan_ready(sk);
876d9484
MH		 3152 goto unlock;
3153 }
3154
3155 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 3156 u8 buf[64];
1da177e4 3157 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
79d554a6 3158 l2cap_build_conf_req(sk, buf), buf);
f2fcfcd6 3159 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3160 }
3161
3162unlock:
3163 bh_unlock_sock(sk);
3164 return 0;
3165}
3166
3167static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3168{
3169 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3170 u16 scid, flags, result;
3171 struct sock *sk;
7b1c0049 3172 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 3173
3174 scid = __le16_to_cpu(rsp->scid);
3175 flags = __le16_to_cpu(rsp->flags);
3176 result = __le16_to_cpu(rsp->result);
3177
af05b30b
GP		 3178 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
3179 scid, flags, result);
1da177e4 3180
af05b30b
GP		 3181 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3182 if (!sk)
1da177e4
LT		 3183 return 0;
3184
3185 switch (result) {
3186 case L2CAP_CONF_SUCCESS:
7b1c0049 3187 l2cap_conf_rfc_get(sk, rsp->data, len);
1da177e4
LT		 3188 break;
3189
3190 case L2CAP_CONF_UNACCEPT:
f2fcfcd6 3191 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3192 char req[64];
3193
c2c77ec8 3194 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
9b108fc0 3195 l2cap_send_disconn_req(conn, sk, ECONNRESET);
c2c77ec8
AE		 3196 goto done;
3197 }
3198
f2fcfcd6
GP		 3199 /* throw out any old stored conf requests */
3200 result = L2CAP_CONF_SUCCESS;
3201 len = l2cap_parse_conf_rsp(sk, rsp->data,
3202 len, req, &result);
3203 if (len < 0) {
9b108fc0 3204 l2cap_send_disconn_req(conn, sk, ECONNRESET);
f2fcfcd6
GP		 3205 goto done;
3206 }
3207
3208 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3209 L2CAP_CONF_REQ, len, req);
3210 l2cap_pi(sk)->num_conf_req++;
3211 if (result != L2CAP_CONF_SUCCESS)
3212 goto done;
3213 break;
1da177e4
LT		 3214 }
3215
8e87d142 3216 default:
b1235d79 3217 sk->sk_err = ECONNRESET;
1da177e4 3218 l2cap_sock_set_timer(sk, HZ * 5);
9b108fc0 3219 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4
LT		 3220 goto done;
3221 }
3222
3223 if (flags & 0x01)
3224 goto done;
3225
1da177e4
LT		 3226 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
3227
3228 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
f64f9e71
JP		 3229 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
3230 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 3231 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
3232
1da177e4 3233 sk->sk_state = BT_CONNECTED;
0565c1c2 3234 l2cap_pi(sk)->next_tx_seq = 0;
1c2acffb 3235 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3236 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3237 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3238 l2cap_ertm_init(sk);
3239
1da177e4
LT		 3240 l2cap_chan_ready(sk);
3241 }
3242
3243done:
3244 bh_unlock_sock(sk);
3245 return 0;
3246}
3247
3248static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3249{
3250 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3251 struct l2cap_disconn_rsp rsp;
3252 u16 dcid, scid;
3253 struct sock *sk;
3254
3255 scid = __le16_to_cpu(req->scid);
3256 dcid = __le16_to_cpu(req->dcid);
3257
3258 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3259
af05b30b
GP		 3260 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3261 if (!sk)
1da177e4
LT		 3262 return 0;
3263
aca3192c
YH		 3264 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3265 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1da177e4
LT		 3266 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3267
3268 sk->sk_shutdown = SHUTDOWN_MASK;
3269
3270 l2cap_chan_del(sk, ECONNRESET);
3271 bh_unlock_sock(sk);
3272
3273 l2cap_sock_kill(sk);
3274 return 0;
3275}
3276
3277static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3278{
3279 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3280 u16 dcid, scid;
3281 struct sock *sk;
3282
3283 scid = __le16_to_cpu(rsp->scid);
3284 dcid = __le16_to_cpu(rsp->dcid);
3285
3286 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3287
af05b30b
GP		 3288 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3289 if (!sk)
1da177e4
LT		 3290 return 0;
3291
3292 l2cap_chan_del(sk, 0);
3293 bh_unlock_sock(sk);
3294
3295 l2cap_sock_kill(sk);
3296 return 0;
3297}
3298
3299static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3300{
3301 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3302 u16 type;
3303
3304 type = __le16_to_cpu(req->type);
3305
3306 BT_DBG("type 0x%4.4x", type);
3307
f0709e03
MH		 3308 if (type == L2CAP_IT_FEAT_MASK) {
3309 u8 buf[8];
44dd46de 3310 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3311 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3312 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3313 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3314 if (!disable_ertm)
fcc203c3
GP		 3315 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3316 | L2CAP_FEAT_FCS;
1b7bf4ed 3317 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3318 l2cap_send_cmd(conn, cmd->ident,
3319 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3320 } else if (type == L2CAP_IT_FIXED_CHAN) {
3321 u8 buf[12];
3322 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3323 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3324 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3325 memcpy(buf + 4, l2cap_fixed_chan, 8);
3326 l2cap_send_cmd(conn, cmd->ident,
3327 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3328 } else {
3329 struct l2cap_info_rsp rsp;
3330 rsp.type = cpu_to_le16(type);
3331 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3332 l2cap_send_cmd(conn, cmd->ident,
3333 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3334 }
1da177e4
LT		 3335
3336 return 0;
3337}
3338
3339static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3340{
3341 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3342 u16 type, result;
3343
3344 type = __le16_to_cpu(rsp->type);
3345 result = __le16_to_cpu(rsp->result);
3346
3347 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3348
4e8402a3
MH		 3349 del_timer(&conn->info_timer);
3350
adb08ede
VT		 3351 if (result != L2CAP_IR_SUCCESS) {
3352 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3353 conn->info_ident = 0;
3354
3355 l2cap_conn_start(conn);
3356
3357 return 0;
3358 }
3359
984947dc 3360 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3361 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3362
47ec1dcd 3363 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3364 struct l2cap_info_req req;
3365 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3366
3367 conn->info_ident = l2cap_get_ident(conn);
3368
3369 l2cap_send_cmd(conn, conn->info_ident,
3370 L2CAP_INFO_REQ, sizeof(req), &req);
3371 } else {
3372 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3373 conn->info_ident = 0;
3374
3375 l2cap_conn_start(conn);
3376 }
3377 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3378 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3379 conn->info_ident = 0;
984947dc
MH		 3380
3381 l2cap_conn_start(conn);
3382 }
4e8402a3 3383
1da177e4
LT		 3384 return 0;
3385}
3386
3387static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3388{
3389 u8 *data = skb->data;
3390 int len = skb->len;
3391 struct l2cap_cmd_hdr cmd;
3392 int err = 0;
3393
3394 l2cap_raw_recv(conn, skb);
3395
3396 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3397 u16 cmd_len;
1da177e4
LT		 3398 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3399 data += L2CAP_CMD_HDR_SIZE;
3400 len -= L2CAP_CMD_HDR_SIZE;
3401
88219a0f 3402 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3403
88219a0f 3404 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3405
88219a0f 3406 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3407 BT_DBG("corrupted command");
3408 break;
3409 }
3410
3411 switch (cmd.code) {
3412 case L2CAP_COMMAND_REJ:
4e8402a3 3413 l2cap_command_rej(conn, &cmd, data);
1da177e4
LT		 3414 break;
3415
3416 case L2CAP_CONN_REQ:
3417 err = l2cap_connect_req(conn, &cmd, data);
3418 break;
3419
3420 case L2CAP_CONN_RSP:
3421 err = l2cap_connect_rsp(conn, &cmd, data);
3422 break;
3423
3424 case L2CAP_CONF_REQ:
88219a0f 3425 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1da177e4
LT		 3426 break;
3427
3428 case L2CAP_CONF_RSP:
3429 err = l2cap_config_rsp(conn, &cmd, data);
3430 break;
3431
3432 case L2CAP_DISCONN_REQ:
3433 err = l2cap_disconnect_req(conn, &cmd, data);
3434 break;
3435
3436 case L2CAP_DISCONN_RSP:
3437 err = l2cap_disconnect_rsp(conn, &cmd, data);
3438 break;
3439
3440 case L2CAP_ECHO_REQ:
88219a0f 3441 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1da177e4
LT		 3442 break;
3443
3444 case L2CAP_ECHO_RSP:
3445 break;
3446
3447 case L2CAP_INFO_REQ:
3448 err = l2cap_information_req(conn, &cmd, data);
3449 break;
3450
3451 case L2CAP_INFO_RSP:
3452 err = l2cap_information_rsp(conn, &cmd, data);
3453 break;
3454
3455 default:
3456 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3457 err = -EINVAL;
3458 break;
3459 }
3460
3461 if (err) {
3462 struct l2cap_cmd_rej rej;
3463 BT_DBG("error %d", err);
3464
3465 /* FIXME: Map err to a valid reason */
aca3192c 3466 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3467 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3468 }
3469
88219a0f
AV		 3470 data += cmd_len;
3471 len -= cmd_len;
1da177e4
LT		 3472 }
3473
3474 kfree_skb(skb);
3475}
3476
fcc203c3
GP		 3477static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3478{
3479 u16 our_fcs, rcv_fcs;
3480 int hdr_size = L2CAP_HDR_SIZE + 2;
3481
3482 if (pi->fcs == L2CAP_FCS_CRC16) {
3483 skb_trim(skb, skb->len - 2);
3484 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3485 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3486
3487 if (our_fcs != rcv_fcs)
7a560e5c 3488 return -EBADMSG;
fcc203c3
GP		 3489 }
3490 return 0;
3491}
3492
d5392c8f
GP		 3493static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3494{
3495 struct l2cap_pinfo *pi = l2cap_pi(sk);
3496 u16 control = 0;
3497
3498 pi->frames_sent = 0;
d5392c8f
GP		 3499
3500 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3501
3502 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
64988868 3503 control |= L2CAP_SUPER_RCV_NOT_READY;
d5392c8f 3504 l2cap_send_sframe(pi, control);
1890d36b 3505 pi->conn_state |= L2CAP_CONN_RNR_SENT;
d5392c8f
GP		 3506 }
3507
4ea727ef
GP		 3508 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY)
3509 l2cap_retransmit_frames(sk);
d5392c8f
GP		 3510
3511 l2cap_ertm_send(sk);
3512
3513 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3514 pi->frames_sent == 0) {
3515 control |= L2CAP_SUPER_RCV_READY;
d5392c8f
GP		 3516 l2cap_send_sframe(pi, control);
3517 }
3518}
3519
9b53350d 3520static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
8f17154f
GP		 3521{
3522 struct sk_buff *next_skb;
bfbacc11
JPRV		 3523 struct l2cap_pinfo *pi = l2cap_pi(sk);
3524 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3525
3526 bt_cb(skb)->tx_seq = tx_seq;
3527 bt_cb(skb)->sar = sar;
3528
3529 next_skb = skb_peek(SREJ_QUEUE(sk));
3530 if (!next_skb) {
3531 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d 3532 return 0;
8f17154f
GP		 3533 }
3534
bfbacc11
JPRV		 3535 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3536 if (tx_seq_offset < 0)
3537 tx_seq_offset += 64;
3538
8f17154f 3539 do {
9b53350d
JPRV		 3540 if (bt_cb(next_skb)->tx_seq == tx_seq)
3541 return -EINVAL;
3542
bfbacc11
JPRV		 3543 next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
3544 pi->buffer_seq) % 64;
3545 if (next_tx_seq_offset < 0)
3546 next_tx_seq_offset += 64;
3547
3548 if (next_tx_seq_offset > tx_seq_offset) {
8f17154f 3549 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
9b53350d 3550 return 0;
8f17154f
GP		 3551 }
3552
3553 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3554 break;
3555
59203a21 3556 } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
8f17154f
GP		 3557
3558 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d
JPRV		 3559
3560 return 0;
8f17154f
GP		 3561}
3562
18778a63
GP		 3563static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3564{
3565 struct l2cap_pinfo *pi = l2cap_pi(sk);
3566 struct sk_buff *_skb;
1890d36b 3567 int err;
18778a63
GP		 3568
3569 switch (control & L2CAP_CTRL_SAR) {
3570 case L2CAP_SDU_UNSEGMENTED:
3571 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3572 goto drop;
3573
3574 err = sock_queue_rcv_skb(sk, skb);
3575 if (!err)
3576 return err;
3577
3578 break;
3579
3580 case L2CAP_SDU_START:
3581 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3582 goto drop;
3583
3584 pi->sdu_len = get_unaligned_le16(skb->data);
18778a63
GP		 3585
3586 if (pi->sdu_len > pi->imtu)
3587 goto disconnect;
3588
3589 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
1890d36b
GP		 3590 if (!pi->sdu)
3591 return -ENOMEM;
3592
3593 /* pull sdu_len bytes only after alloc, because of Local Busy
3594 * condition we have to be sure that this will be executed
3595 * only once, i.e., when alloc does not fail */
3596 skb_pull(skb, 2);
18778a63
GP		 3597
3598 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3599
3600 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3601 pi->partial_sdu_len = skb->len;
3602 break;
3603
3604 case L2CAP_SDU_CONTINUE:
3605 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3606 goto disconnect;
3607
3608 if (!pi->sdu)
3609 goto disconnect;
3610
18778a63
GP		 3611 pi->partial_sdu_len += skb->len;
3612 if (pi->partial_sdu_len > pi->sdu_len)
3613 goto drop;
3614
4178ba46
GP		 3615 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3616
18778a63
GP		 3617 break;
3618
3619 case L2CAP_SDU_END:
3620 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3621 goto disconnect;
3622
3623 if (!pi->sdu)
3624 goto disconnect;
3625
1890d36b 3626 if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) {
1890d36b 3627 pi->partial_sdu_len += skb->len;
18778a63 3628
1890d36b
GP		 3629 if (pi->partial_sdu_len > pi->imtu)
3630 goto drop;
18778a63 3631
1890d36b
GP		 3632 if (pi->partial_sdu_len != pi->sdu_len)
3633 goto drop;
4178ba46
GP		 3634
3635 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
1890d36b 3636 }
18778a63
GP		 3637
3638 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
1890d36b
GP		 3639 if (!_skb) {
3640 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3641 return -ENOMEM;
3642 }
3643
18778a63 3644 err = sock_queue_rcv_skb(sk, _skb);
1890d36b 3645 if (err < 0) {
18778a63 3646 kfree_skb(_skb);
1890d36b
GP		 3647 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3648 return err;
3649 }
3650
3651 pi->conn_state &= ~L2CAP_CONN_SAR_RETRY;
3652 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
18778a63
GP		 3653
3654 kfree_skb(pi->sdu);
3655 break;
3656 }
3657
3658 kfree_skb(skb);
1890d36b 3659 return 0;
18778a63
GP		 3660
3661drop:
3662 kfree_skb(pi->sdu);
3663 pi->sdu = NULL;
3664
3665disconnect:
9b108fc0 3666 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
18778a63
GP		 3667 kfree_skb(skb);
3668 return 0;
3669}
3670
712132eb
GP		 3671static int l2cap_try_push_rx_skb(struct sock *sk)
3672{
3673 struct l2cap_pinfo *pi = l2cap_pi(sk);
3674 struct sk_buff *skb;
3675 u16 control;
3676 int err;
3677
3678 while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) {
3679 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3680 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3681 if (err < 0) {
3682 skb_queue_head(BUSY_QUEUE(sk), skb);
3683 return -EBUSY;
3684 }
3685
3686 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3687 }
3688
3689 if (!(pi->conn_state & L2CAP_CONN_RNR_SENT))
3690 goto done;
3691
3692 control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3693 control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
3694 l2cap_send_sframe(pi, control);
3695 l2cap_pi(sk)->retry_count = 1;
3696
3697 del_timer(&pi->retrans_timer);
3698 __mod_monitor_timer();
3699
3700 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
3701
3702done:
3703 pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
3704 pi->conn_state &= ~L2CAP_CONN_RNR_SENT;
3705
3706 BT_DBG("sk %p, Exit local busy", sk);
3707
3708 return 0;
3709}
3710
1890d36b
GP		 3711static void l2cap_busy_work(struct work_struct *work)
3712{
3713 DECLARE_WAITQUEUE(wait, current);
3714 struct l2cap_pinfo *pi =
3715 container_of(work, struct l2cap_pinfo, busy_work);
3716 struct sock *sk = (struct sock *)pi;
3717 int n_tries = 0, timeo = HZ/5, err;
3718 struct sk_buff *skb;
1890d36b
GP		 3719
3720 lock_sock(sk);
3721
2b0b05dd 3722 add_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3723 while ((skb = skb_peek(BUSY_QUEUE(sk)))) {
3724 set_current_state(TASK_INTERRUPTIBLE);
3725
3726 if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
3727 err = -EBUSY;
9b108fc0 3728 l2cap_send_disconn_req(pi->conn, sk, EBUSY);
712132eb 3729 break;
1890d36b
GP		 3730 }
3731
3732 if (!timeo)
3733 timeo = HZ/5;
3734
3735 if (signal_pending(current)) {
3736 err = sock_intr_errno(timeo);
712132eb 3737 break;
1890d36b
GP		 3738 }
3739
3740 release_sock(sk);
3741 timeo = schedule_timeout(timeo);
3742 lock_sock(sk);
3743
3744 err = sock_error(sk);
3745 if (err)
712132eb 3746 break;
1890d36b 3747
712132eb 3748 if (l2cap_try_push_rx_skb(sk) == 0)
1890d36b
GP		 3749 break;
3750 }
3751
1890d36b 3752 set_current_state(TASK_RUNNING);
2b0b05dd 3753 remove_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3754
3755 release_sock(sk);
3756}
3757
3758static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control)
3759{
3760 struct l2cap_pinfo *pi = l2cap_pi(sk);
3761 int sctrl, err;
3762
3763 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3764 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3765 __skb_queue_tail(BUSY_QUEUE(sk), skb);
712132eb
GP		 3766 return l2cap_try_push_rx_skb(sk);
3767
3768
1890d36b
GP		 3769 }
3770
3771 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3772 if (err >= 0) {
3773 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3774 return err;
3775 }
3776
3777 /* Busy Condition */
0e98958d
GP		 3778 BT_DBG("sk %p, Enter local busy", sk);
3779
1890d36b
GP		 3780 pi->conn_state |= L2CAP_CONN_LOCAL_BUSY;
3781 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3782 __skb_queue_tail(BUSY_QUEUE(sk), skb);
3783
3784 sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3785 sctrl |= L2CAP_SUPER_RCV_NOT_READY;
3786 l2cap_send_sframe(pi, sctrl);
3787
3788 pi->conn_state |= L2CAP_CONN_RNR_SENT;
3789
7fe9b298
GP		 3790 del_timer(&pi->ack_timer);
3791
1890d36b
GP		 3792 queue_work(_busy_wq, &pi->busy_work);
3793
3794 return err;
3795}
3796
18778a63 3797static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
c74e560c
GP		 3798{
3799 struct l2cap_pinfo *pi = l2cap_pi(sk);
3800 struct sk_buff *_skb;
3801 int err = -EINVAL;
3802
18778a63
GP		 3803 /*
3804 * TODO: We have to notify the userland if some data is lost with the
3805 * Streaming Mode.
3806 */
3807
c74e560c
GP		 3808 switch (control & L2CAP_CTRL_SAR) {
3809 case L2CAP_SDU_UNSEGMENTED:
3810 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3811 kfree_skb(pi->sdu);
3812 break;
3813 }
3814
3815 err = sock_queue_rcv_skb(sk, skb);
3816 if (!err)
3817 return 0;
3818
3819 break;
3820
3821 case L2CAP_SDU_START:
3822 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3823 kfree_skb(pi->sdu);
3824 break;
3825 }
3826
3827 pi->sdu_len = get_unaligned_le16(skb->data);
3828 skb_pull(skb, 2);
3829
052897ca
GP		 3830 if (pi->sdu_len > pi->imtu) {
3831 err = -EMSGSIZE;
3832 break;
3833 }
3834
c74e560c
GP		 3835 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3836 if (!pi->sdu) {
3837 err = -ENOMEM;
3838 break;
3839 }
3840
3841 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3842
3843 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3844 pi->partial_sdu_len = skb->len;
3845 err = 0;
3846 break;
3847
3848 case L2CAP_SDU_CONTINUE:
3849 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3850 break;
3851
3852 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3853
3854 pi->partial_sdu_len += skb->len;
3855 if (pi->partial_sdu_len > pi->sdu_len)
3856 kfree_skb(pi->sdu);
3857 else
3858 err = 0;
3859
3860 break;
3861
3862 case L2CAP_SDU_END:
3863 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3864 break;
3865
3866 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3867
3868 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3869 pi->partial_sdu_len += skb->len;
3870
36f2fd58
GP		 3871 if (pi->partial_sdu_len > pi->imtu)
3872 goto drop;
3873
c74e560c
GP		 3874 if (pi->partial_sdu_len == pi->sdu_len) {
3875 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3876 err = sock_queue_rcv_skb(sk, _skb);
3877 if (err < 0)
3878 kfree_skb(_skb);
3879 }
c74e560c
GP		 3880 err = 0;
3881
36f2fd58
GP		 3882drop:
3883 kfree_skb(pi->sdu);
c74e560c
GP		 3884 break;
3885 }
3886
3887 kfree_skb(skb);
3888 return err;
3889}
3890
8f17154f
GP		 3891static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3892{
3893 struct sk_buff *skb;
afefdbc4 3894 u16 control;
8f17154f 3895
59203a21 3896 while ((skb = skb_peek(SREJ_QUEUE(sk)))) {
8f17154f
GP		 3897 if (bt_cb(skb)->tx_seq != tx_seq)
3898 break;
3899
3900 skb = skb_dequeue(SREJ_QUEUE(sk));
afefdbc4 3901 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
18778a63 3902 l2cap_ertm_reassembly_sdu(sk, skb, control);
8f17154f
GP		 3903 l2cap_pi(sk)->buffer_seq_srej =
3904 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
8ff50ec0 3905 tx_seq = (tx_seq + 1) % 64;
8f17154f
GP		 3906 }
3907}
3908
3909static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3910{
3911 struct l2cap_pinfo *pi = l2cap_pi(sk);
3912 struct srej_list *l, *tmp;
3913 u16 control;
3914
59203a21 3915 list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
8f17154f
GP		 3916 if (l->tx_seq == tx_seq) {
3917 list_del(&l->list);
3918 kfree(l);
3919 return;
3920 }
3921 control = L2CAP_SUPER_SELECT_REJECT;
3922 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3923 l2cap_send_sframe(pi, control);
3924 list_del(&l->list);
3925 list_add_tail(&l->list, SREJ_LIST(sk));
3926 }
3927}
3928
3929static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3930{
3931 struct l2cap_pinfo *pi = l2cap_pi(sk);
3932 struct srej_list *new;
3933 u16 control;
3934
3935 while (tx_seq != pi->expected_tx_seq) {
3936 control = L2CAP_SUPER_SELECT_REJECT;
3937 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3938 l2cap_send_sframe(pi, control);
3939
3940 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
8ff50ec0
GP		 3941 new->tx_seq = pi->expected_tx_seq;
3942 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3943 list_add_tail(&new->list, SREJ_LIST(sk));
3944 }
8ff50ec0 3945 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3946}
3947
1c2acffb
GP		 3948static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3949{
3950 struct l2cap_pinfo *pi = l2cap_pi(sk);
3951 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3952 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3953 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
f6337c77 3954 int tx_seq_offset, expected_tx_seq_offset;
803020c6 3955 int num_to_ack = (pi->tx_win/6) + 1;
1c2acffb
GP		 3956 int err = 0;
3957
0e98958d
GP		 3958 BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq,
3959 rx_control);
1c2acffb 3960
9b16dc65
GP		 3961 if (L2CAP_CTRL_FINAL & rx_control &&
3962 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
1d8f5d16
GP		 3963 del_timer(&pi->monitor_timer);
3964 if (pi->unacked_frames > 0)
3965 __mod_retrans_timer();
3966 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
3967 }
3968
9f121a5a
GP		 3969 pi->expected_ack_seq = req_seq;
3970 l2cap_drop_acked_frames(sk);
3971
8f17154f
GP		 3972 if (tx_seq == pi->expected_tx_seq)
3973 goto expected;
1c2acffb 3974
9b53350d
JPRV		 3975 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3976 if (tx_seq_offset < 0)
3977 tx_seq_offset += 64;
3978
3979 /* invalid tx_seq */
3980 if (tx_seq_offset >= pi->tx_win) {
9b108fc0 3981 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
9b53350d
JPRV		 3982 goto drop;
3983 }
3984
1890d36b
GP		 3985 if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY)
3986 goto drop;
3987
8f17154f
GP		 3988 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3989 struct srej_list *first;
30afb5b2 3990
8f17154f
GP		 3991 first = list_first_entry(SREJ_LIST(sk),
3992 struct srej_list, list);
3993 if (tx_seq == first->tx_seq) {
3994 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3995 l2cap_check_srej_gap(sk, tx_seq);
3996
3997 list_del(&first->list);
3998 kfree(first);
3999
4000 if (list_empty(SREJ_LIST(sk))) {
4001 pi->buffer_seq = pi->buffer_seq_srej;
4002 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
855666cc 4003 l2cap_send_ack(pi);
0e98958d 4004 BT_DBG("sk %p, Exit SREJ_SENT", sk);
8f17154f
GP		 4005 }
4006 } else {
4007 struct srej_list *l;
9b53350d
JPRV		 4008
4009 /* duplicated tx_seq */
4010 if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
4011 goto drop;
8f17154f
GP		 4012
4013 list_for_each_entry(l, SREJ_LIST(sk), list) {
4014 if (l->tx_seq == tx_seq) {
4015 l2cap_resend_srejframe(sk, tx_seq);
4016 return 0;
4017 }
4018 }
4019 l2cap_send_srejframe(sk, tx_seq);
30afb5b2
GP		 4020 }
4021 } else {
9b53350d
JPRV		 4022 expected_tx_seq_offset =
4023 (pi->expected_tx_seq - pi->buffer_seq) % 64;
4024 if (expected_tx_seq_offset < 0)
4025 expected_tx_seq_offset += 64;
4026
4027 /* duplicated tx_seq */
4028 if (tx_seq_offset < expected_tx_seq_offset)
4029 goto drop;
4030
8f17154f 4031 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 4032
0e98958d
GP		 4033 BT_DBG("sk %p, Enter SREJ", sk);
4034
8f17154f
GP		 4035 INIT_LIST_HEAD(SREJ_LIST(sk));
4036 pi->buffer_seq_srej = pi->buffer_seq;
4037
4038 __skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b 4039 __skb_queue_head_init(BUSY_QUEUE(sk));
8f17154f
GP		 4040 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
4041
ef54fd93
GP		 4042 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
4043
8f17154f 4044 l2cap_send_srejframe(sk, tx_seq);
7fe9b298
GP		 4045
4046 del_timer(&pi->ack_timer);
1c2acffb 4047 }
30afb5b2
GP		 4048 return 0;
4049
8f17154f
GP		 4050expected:
4051 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
4052
4053 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3b1a9f3f
GP		 4054 bt_cb(skb)->tx_seq = tx_seq;
4055 bt_cb(skb)->sar = sar;
4056 __skb_queue_tail(SREJ_QUEUE(sk), skb);
8f17154f
GP		 4057 return 0;
4058 }
4059
2ece3684
GP		 4060 err = l2cap_push_rx_skb(sk, skb, rx_control);
4061 if (err < 0)
4062 return 0;
4063
4ec10d97
GP		 4064 if (rx_control & L2CAP_CTRL_FINAL) {
4065 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4066 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4067 else
4068 l2cap_retransmit_frames(sk);
4ec10d97
GP		 4069 }
4070
c1b4f43b
GP		 4071 __mod_ack_timer();
4072
803020c6
GP		 4073 pi->num_acked = (pi->num_acked + 1) % num_to_ack;
4074 if (pi->num_acked == num_to_ack - 1)
9e917af1
GP		 4075 l2cap_send_ack(pi);
4076
8f17154f 4077 return 0;
9b53350d
JPRV		 4078
4079drop:
4080 kfree_skb(skb);
4081 return 0;
1c2acffb
GP		 4082}
4083
e072745f 4084static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
1c2acffb
GP		 4085{
4086 struct l2cap_pinfo *pi = l2cap_pi(sk);
6e3a5981 4087
0e98958d
GP		 4088 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control),
4089 rx_control);
4090
6e3a5981
GP		 4091 pi->expected_ack_seq = __get_reqseq(rx_control);
4092 l2cap_drop_acked_frames(sk);
1c2acffb 4093
e072745f 4094 if (rx_control & L2CAP_CTRL_POLL) {
3cb123d1 4095 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
05fbd89d
GP		 4096 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
4097 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4098 (pi->unacked_frames > 0))
4099 __mod_retrans_timer();
4100
4101 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4102 l2cap_send_srejtail(sk);
4103 } else {
4104 l2cap_send_i_or_rr_or_rnr(sk);
05fbd89d 4105 }
1d8f5d16 4106
e072745f
GP		 4107 } else if (rx_control & L2CAP_CTRL_FINAL) {
4108 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 4109
e072745f
GP		 4110 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4111 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4112 else
4113 l2cap_retransmit_frames(sk);
2246b2f1 4114
e072745f 4115 } else {
e072745f
GP		 4116 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4117 (pi->unacked_frames > 0))
4118 __mod_retrans_timer();
1c2acffb 4119
2246b2f1 4120 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
dfc909be 4121 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
e072745f 4122 l2cap_send_ack(pi);
dfc909be 4123 } else {
e072745f 4124 l2cap_ertm_send(sk);
dfc909be 4125 }
e072745f
GP		 4126 }
4127}
2246b2f1 4128
e072745f
GP		 4129static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
4130{
4131 struct l2cap_pinfo *pi = l2cap_pi(sk);
4132 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4133
0e98958d
GP		 4134 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4135
e072745f
GP		 4136 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4137
8abb52ee 4138 pi->expected_ack_seq = tx_seq;
e072745f
GP		 4139 l2cap_drop_acked_frames(sk);
4140
4141 if (rx_control & L2CAP_CTRL_FINAL) {
4142 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4143 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4144 else
4145 l2cap_retransmit_frames(sk);
e072745f 4146 } else {
dfc909be 4147 l2cap_retransmit_frames(sk);
30afb5b2 4148
0301ef04 4149 if (pi->conn_state & L2CAP_CONN_WAIT_F)
e072745f 4150 pi->conn_state |= L2CAP_CONN_REJ_ACT;
e072745f
GP		 4151 }
4152}
4153static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
4154{
4155 struct l2cap_pinfo *pi = l2cap_pi(sk);
4156 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4157
0e98958d
GP		 4158 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4159
e072745f 4160 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 4161
e072745f
GP		 4162 if (rx_control & L2CAP_CTRL_POLL) {
4163 pi->expected_ack_seq = tx_seq;
4164 l2cap_drop_acked_frames(sk);
3cb123d1
GP		 4165
4166 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
dfc909be
GP		 4167 l2cap_retransmit_one_frame(sk, tx_seq);
4168
e072745f 4169 l2cap_ertm_send(sk);
dfc909be 4170
e072745f
GP		 4171 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4172 pi->srej_save_reqseq = tx_seq;
4173 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4174 }
e072745f
GP		 4175 } else if (rx_control & L2CAP_CTRL_FINAL) {
4176 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
4177 pi->srej_save_reqseq == tx_seq)
4178 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
4179 else
dfc909be 4180 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f 4181 } else {
dfc909be 4182 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f
GP		 4183 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4184 pi->srej_save_reqseq = tx_seq;
4185 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4186 }
e072745f
GP		 4187 }
4188}
4189
4190static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
4191{
4192 struct l2cap_pinfo *pi = l2cap_pi(sk);
4193 u8 tx_seq = __get_reqseq(rx_control);
4194
0e98958d
GP		 4195 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4196
e072745f
GP		 4197 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
4198 pi->expected_ack_seq = tx_seq;
4199 l2cap_drop_acked_frames(sk);
4200
3cb123d1
GP		 4201 if (rx_control & L2CAP_CTRL_POLL)
4202 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
4203
99b0d4b7
GP		 4204 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
4205 del_timer(&pi->retrans_timer);
a2e12a2a
GP		 4206 if (rx_control & L2CAP_CTRL_POLL)
4207 l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL);
99b0d4b7 4208 return;
e072745f 4209 }
99b0d4b7
GP		 4210
4211 if (rx_control & L2CAP_CTRL_POLL)
4212 l2cap_send_srejtail(sk);
4213 else
4214 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
e072745f
GP		 4215}
4216
4217static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
4218{
4219 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
4220
9b16dc65
GP		 4221 if (L2CAP_CTRL_FINAL & rx_control &&
4222 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
e072745f
GP		 4223 del_timer(&l2cap_pi(sk)->monitor_timer);
4224 if (l2cap_pi(sk)->unacked_frames > 0)
4225 __mod_retrans_timer();
4226 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
4227 }
4228
4229 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
4230 case L2CAP_SUPER_RCV_READY:
4231 l2cap_data_channel_rrframe(sk, rx_control);
8f17154f
GP		 4232 break;
4233
e072745f
GP		 4234 case L2CAP_SUPER_REJECT:
4235 l2cap_data_channel_rejframe(sk, rx_control);
4236 break;
2246b2f1 4237
e072745f
GP		 4238 case L2CAP_SUPER_SELECT_REJECT:
4239 l2cap_data_channel_srejframe(sk, rx_control);
4240 break;
4241
4242 case L2CAP_SUPER_RCV_NOT_READY:
4243 l2cap_data_channel_rnrframe(sk, rx_control);
1c2acffb
GP		 4244 break;
4245 }
4246
faaebd19 4247 kfree_skb(skb);
1c2acffb
GP		 4248 return 0;
4249}
4250
218bb9df
GP		 4251static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
4252{
4253 struct l2cap_pinfo *pi = l2cap_pi(sk);
4254 u16 control;
4255 u8 req_seq;
4256 int len, next_tx_seq_offset, req_seq_offset;
4257
4258 control = get_unaligned_le16(skb->data);
4259 skb_pull(skb, 2);
4260 len = skb->len;
4261
4262 /*
4263 * We can just drop the corrupted I-frame here.
4264 * Receiver will miss it and start proper recovery
4265 * procedures and ask retransmission.
4266 */
4267 if (l2cap_check_fcs(pi, skb))
4268 goto drop;
4269
4270 if (__is_sar_start(control) && __is_iframe(control))
4271 len -= 2;
4272
4273 if (pi->fcs == L2CAP_FCS_CRC16)
4274 len -= 2;
4275
4276 if (len > pi->mps) {
4277 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4278 goto drop;
4279 }
4280
4281 req_seq = __get_reqseq(control);
4282 req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
4283 if (req_seq_offset < 0)
4284 req_seq_offset += 64;
4285
4286 next_tx_seq_offset =
4287 (pi->next_tx_seq - pi->expected_ack_seq) % 64;
4288 if (next_tx_seq_offset < 0)
4289 next_tx_seq_offset += 64;
4290
4291 /* check for invalid req-seq */
4292 if (req_seq_offset > next_tx_seq_offset) {
4293 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4294 goto drop;
4295 }
4296
4297 if (__is_iframe(control)) {
4298 if (len < 0) {
4299 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4300 goto drop;
4301 }
4302
4303 l2cap_data_channel_iframe(sk, control, skb);
4304 } else {
4305 if (len != 0) {
4306 BT_ERR("%d", len);
4307 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4308 goto drop;
4309 }
4310
4311 l2cap_data_channel_sframe(sk, control, skb);
4312 }
4313
4314 return 0;
4315
4316drop:
4317 kfree_skb(skb);
4318 return 0;
4319}
4320
1da177e4
LT		 4321static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4322{
4323 struct sock *sk;
6840ed07 4324 struct l2cap_pinfo *pi;
51893f88 4325 u16 control;
218bb9df
GP		 4326 u8 tx_seq;
4327 int len;
1da177e4
LT		 4328
4329 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
4330 if (!sk) {
4331 BT_DBG("unknown cid 0x%4.4x", cid);
4332 goto drop;
4333 }
4334
6840ed07
GP		 4335 pi = l2cap_pi(sk);
4336
1da177e4
LT		 4337 BT_DBG("sk %p, len %d", sk, skb->len);
4338
4339 if (sk->sk_state != BT_CONNECTED)
4340 goto drop;
4341
6840ed07 4342 switch (pi->mode) {
1c2acffb
GP		 4343 case L2CAP_MODE_BASIC:
4344 /* If socket recv buffers overflows we drop data here
4345 * which is *bad* because L2CAP has to be reliable.
4346 * But we don't have any other choice. L2CAP doesn't
4347 * provide flow control mechanism. */
1da177e4 4348
6840ed07 4349 if (pi->imtu < skb->len)
1c2acffb 4350 goto drop;
1da177e4 4351
1c2acffb
GP		 4352 if (!sock_queue_rcv_skb(sk, skb))
4353 goto done;
4354 break;
4355
4356 case L2CAP_MODE_ERTM:
218bb9df
GP		 4357 if (!sock_owned_by_user(sk)) {
4358 l2cap_ertm_data_rcv(sk, skb);
277ffbe3 4359 } else {
218bb9df 4360 if (sk_add_backlog(sk, skb))
277ffbe3 4361 goto drop;
277ffbe3 4362 }
1c2acffb 4363
fcafde2e 4364 goto done;
1c2acffb 4365
6840ed07
GP		 4366 case L2CAP_MODE_STREAMING:
4367 control = get_unaligned_le16(skb->data);
4368 skb_pull(skb, 2);
4369 len = skb->len;
4370
26000089
GP		 4371 if (l2cap_check_fcs(pi, skb))
4372 goto drop;
4373
6840ed07
GP		 4374 if (__is_sar_start(control))
4375 len -= 2;
4376
fcc203c3
GP		 4377 if (pi->fcs == L2CAP_FCS_CRC16)
4378 len -= 2;
4379
51893f88 4380 if (len > pi->mps || len < 0 || __is_sframe(control))
6840ed07
GP		 4381 goto drop;
4382
4383 tx_seq = __get_txseq(control);
4384
4385 if (pi->expected_tx_seq == tx_seq)
4386 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
4387 else
7dffe421 4388 pi->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 4389
18778a63 4390 l2cap_streaming_reassembly_sdu(sk, skb, control);
6840ed07
GP		 4391
4392 goto done;
4393
1c2acffb 4394 default:
e8235c6b 4395 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
1c2acffb
GP		 4396 break;
4397 }
1da177e4
LT		 4398
4399drop:
4400 kfree_skb(skb);
4401
4402done:
0139418c
MH		 4403 if (sk)
4404 bh_unlock_sock(sk);
4405
1da177e4
LT		 4406 return 0;
4407}
4408
8e036fc3 4409static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4
LT		 4410{
4411 struct sock *sk;
4412
4413 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
4414 if (!sk)
4415 goto drop;
4416
4417 BT_DBG("sk %p, len %d", sk, skb->len);
4418
4419 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
4420 goto drop;
4421
4422 if (l2cap_pi(sk)->imtu < skb->len)
4423 goto drop;
4424
4425 if (!sock_queue_rcv_skb(sk, skb))
4426 goto done;
4427
4428drop:
4429 kfree_skb(skb);
4430
4431done:
af05b30b
GP		 4432 if (sk)
4433 bh_unlock_sock(sk);
1da177e4
LT		 4434 return 0;
4435}
4436
4437static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4438{
4439 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4440 u16 cid, len;
4441 __le16 psm;
1da177e4
LT		 4442
4443 skb_pull(skb, L2CAP_HDR_SIZE);
4444 cid = __le16_to_cpu(lh->cid);
4445 len = __le16_to_cpu(lh->len);
4446
1c2acffb
GP		 4447 if (len != skb->len) {
4448 kfree_skb(skb);
4449 return;
4450 }
4451
1da177e4
LT		 4452 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4453
4454 switch (cid) {
8db4dc46 4455 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4456 l2cap_sig_channel(conn, skb);
4457 break;
4458
8db4dc46 4459 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4460 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4461 skb_pull(skb, 2);
4462 l2cap_conless_channel(conn, psm, skb);
4463 break;
4464
4465 default:
4466 l2cap_data_channel(conn, cid, skb);
4467 break;
4468 }
4469}
4470
4471/* ---- L2CAP interface with lower layer (HCI) ---- */
4472
4473static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
4474{
4475 int exact = 0, lm1 = 0, lm2 = 0;
4476 register struct sock *sk;
4477 struct hlist_node *node;
4478
4479 if (type != ACL_LINK)
963cf687 4480 return -EINVAL;
1da177e4
LT		 4481
4482 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4483
4484 /* Find listening sockets and check their link_mode */
4485 read_lock(&l2cap_sk_list.lock);
4486 sk_for_each(sk, node, &l2cap_sk_list.head) {
4487 if (sk->sk_state != BT_LISTEN)
4488 continue;
4489
4490 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5
MH		 4491 lm1 |= HCI_LM_ACCEPT;
4492 if (l2cap_pi(sk)->role_switch)
4493 lm1 |= HCI_LM_MASTER;
1da177e4 4494 exact++;
2af6b9d5
MH		 4495 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4496 lm2 |= HCI_LM_ACCEPT;
4497 if (l2cap_pi(sk)->role_switch)
4498 lm2 |= HCI_LM_MASTER;
4499 }
1da177e4
LT		 4500 }
4501 read_unlock(&l2cap_sk_list.lock);
4502
4503 return exact ? lm1 : lm2;
4504}
4505
4506static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
4507{
0139418c
MH		 4508 struct l2cap_conn *conn;
4509
1da177e4
LT		 4510 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4511
4512 if (hcon->type != ACL_LINK)
963cf687 4513 return -EINVAL;
1da177e4
LT		 4514
4515 if (!status) {
1da177e4
LT		 4516 conn = l2cap_conn_add(hcon, status);
4517 if (conn)
4518 l2cap_conn_ready(conn);
0139418c 4519 } else
1da177e4
LT		 4520 l2cap_conn_del(hcon, bt_err(status));
4521
4522 return 0;
4523}
4524
2950f21a
MH		 4525static int l2cap_disconn_ind(struct hci_conn *hcon)
4526{
4527 struct l2cap_conn *conn = hcon->l2cap_data;
4528
4529 BT_DBG("hcon %p", hcon);
4530
4531 if (hcon->type != ACL_LINK || !conn)
4532 return 0x13;
4533
4534 return conn->disc_reason;
4535}
4536
4537static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4538{
4539 BT_DBG("hcon %p reason %d", hcon, reason);
4540
4541 if (hcon->type != ACL_LINK)
963cf687 4542 return -EINVAL;
1da177e4
LT		 4543
4544 l2cap_conn_del(hcon, bt_err(reason));
0139418c 4545
1da177e4
LT		 4546 return 0;
4547}
4548
f62e4323
MH		 4549static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
4550{
bd3c9e25 4551 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
255c7601
MH		 4552 return;
4553
f62e4323
MH		 4554 if (encrypt == 0x00) {
4555 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
4556 l2cap_sock_clear_timer(sk);
4557 l2cap_sock_set_timer(sk, HZ * 5);
4558 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
4559 __l2cap_sock_close(sk, ECONNREFUSED);
4560 } else {
4561 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
4562 l2cap_sock_clear_timer(sk);
4563 }
4564}
4565
8c1b2355 4566static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4
LT		 4567{
4568 struct l2cap_chan_list *l;
0139418c 4569 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 4570 struct sock *sk;
1da177e4 4571
0139418c 4572 if (!conn)
1da177e4 4573 return 0;
0139418c 4574
1da177e4
LT		 4575 l = &conn->chan_list;
4576
4577 BT_DBG("conn %p", conn);
4578
4579 read_lock(&l->lock);
4580
4581 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
4582 bh_lock_sock(sk);
4583
6a8d3010
MH		 4584 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
4585 bh_unlock_sock(sk);
4586 continue;
4587 }
4588
f62e4323 4589 if (!status && (sk->sk_state == BT_CONNECTED ||
8c1b2355 4590 sk->sk_state == BT_CONFIG)) {
f62e4323 4591 l2cap_check_encryption(sk, encrypt);
9719f8af
MH		 4592 bh_unlock_sock(sk);
4593 continue;
4594 }
4595
b1235d79
MH		 4596 if (sk->sk_state == BT_CONNECT) {
4597 if (!status) {
4598 struct l2cap_conn_req req;
4599 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
4600 req.psm = l2cap_pi(sk)->psm;
1da177e4 4601
b1235d79 4602 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
e501d055 4603 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4 4604
b1235d79
MH		 4605 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4606 L2CAP_CONN_REQ, sizeof(req), &req);
4607 } else {
4608 l2cap_sock_clear_timer(sk);
4609 l2cap_sock_set_timer(sk, HZ / 10);
4610 }
4611 } else if (sk->sk_state == BT_CONNECT2) {
4612 struct l2cap_conn_rsp rsp;
4613 __u16 result;
1da177e4 4614
b1235d79
MH		 4615 if (!status) {
4616 sk->sk_state = BT_CONFIG;
4617 result = L2CAP_CR_SUCCESS;
4618 } else {
4619 sk->sk_state = BT_DISCONN;
4620 l2cap_sock_set_timer(sk, HZ / 10);
4621 result = L2CAP_CR_SEC_BLOCK;
4622 }
4623
4624 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
4625 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
4626 rsp.result = cpu_to_le16(result);
e7c29cb1 4627 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
b1235d79
MH		 4628 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4629 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4630 }
1da177e4
LT		 4631
4632 bh_unlock_sock(sk);
4633 }
4634
4635 read_unlock(&l->lock);
b1235d79 4636
1da177e4
LT		 4637 return 0;
4638}
4639
4640static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4641{
4642 struct l2cap_conn *conn = hcon->l2cap_data;
4643
4644 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4645 goto drop;
4646
4647 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4648
4649 if (flags & ACL_START) {
4650 struct l2cap_hdr *hdr;
4651 int len;
4652
4653 if (conn->rx_len) {
4654 BT_ERR("Unexpected start frame (len %d)", skb->len);
4655 kfree_skb(conn->rx_skb);
4656 conn->rx_skb = NULL;
4657 conn->rx_len = 0;
4658 l2cap_conn_unreliable(conn, ECOMM);
4659 }
4660
4661 if (skb->len < 2) {
4662 BT_ERR("Frame is too short (len %d)", skb->len);
4663 l2cap_conn_unreliable(conn, ECOMM);
4664 goto drop;
4665 }
4666
4667 hdr = (struct l2cap_hdr *) skb->data;
4668 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4669
4670 if (len == skb->len) {
4671 /* Complete frame received */
4672 l2cap_recv_frame(conn, skb);
4673 return 0;
4674 }
4675
4676 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4677
4678 if (skb->len > len) {
4679 BT_ERR("Frame is too long (len %d, expected len %d)",
4680 skb->len, len);
4681 l2cap_conn_unreliable(conn, ECOMM);
4682 goto drop;
4683 }
4684
4685 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4686 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4687 if (!conn->rx_skb)
1da177e4
LT		 4688 goto drop;
4689
d626f62b 4690 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4691 skb->len);
1da177e4
LT		 4692 conn->rx_len = len - skb->len;
4693 } else {
4694 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4695
4696 if (!conn->rx_len) {
4697 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4698 l2cap_conn_unreliable(conn, ECOMM);
4699 goto drop;
4700 }
4701
4702 if (skb->len > conn->rx_len) {
4703 BT_ERR("Fragment is too long (len %d, expected %d)",
4704 skb->len, conn->rx_len);
4705 kfree_skb(conn->rx_skb);
4706 conn->rx_skb = NULL;
4707 conn->rx_len = 0;
4708 l2cap_conn_unreliable(conn, ECOMM);
4709 goto drop;
4710 }
4711
d626f62b 4712 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4713 skb->len);
1da177e4
LT		 4714 conn->rx_len -= skb->len;
4715
4716 if (!conn->rx_len) {
4717 /* Complete frame received */
4718 l2cap_recv_frame(conn, conn->rx_skb);
4719 conn->rx_skb = NULL;
4720 }
4721 }
4722
4723drop:
4724 kfree_skb(skb);
4725 return 0;
4726}
4727
aef7d97c 4728static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4
LT		 4729{
4730 struct sock *sk;
4731 struct hlist_node *node;
1da177e4
LT		 4732
4733 read_lock_bh(&l2cap_sk_list.lock);
4734
be9d1227
MH		 4735 sk_for_each(sk, node, &l2cap_sk_list.head) {
4736 struct l2cap_pinfo *pi = l2cap_pi(sk);
101545f6 4737
aef7d97c
MH		 4738 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4739 batostr(&bt_sk(sk)->src),
4740 batostr(&bt_sk(sk)->dst),
4741 sk->sk_state, __le16_to_cpu(pi->psm),
4742 pi->scid, pi->dcid,
4743 pi->imtu, pi->omtu, pi->sec_level);
be9d1227 4744 }
1da177e4 4745
1da177e4 4746 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 4747
aef7d97c 4748 return 0;
1da177e4
LT		 4749}
4750
aef7d97c
MH		 4751static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4752{
4753 return single_open(file, l2cap_debugfs_show, inode->i_private);
4754}
4755
4756static const struct file_operations l2cap_debugfs_fops = {
4757 .open = l2cap_debugfs_open,
4758 .read = seq_read,
4759 .llseek = seq_lseek,
4760 .release = single_release,
4761};
4762
4763static struct dentry *l2cap_debugfs;
1da177e4 4764
90ddc4f0 4765static const struct proto_ops l2cap_sock_ops = {
1da177e4
LT		 4766 .family = PF_BLUETOOTH,
4767 .owner = THIS_MODULE,
4768 .release = l2cap_sock_release,
4769 .bind = l2cap_sock_bind,
4770 .connect = l2cap_sock_connect,
4771 .listen = l2cap_sock_listen,
4772 .accept = l2cap_sock_accept,
4773 .getname = l2cap_sock_getname,
4774 .sendmsg = l2cap_sock_sendmsg,
f66dc81f 4775 .recvmsg = l2cap_sock_recvmsg,
1da177e4 4776 .poll = bt_sock_poll,
3241ad82 4777 .ioctl = bt_sock_ioctl,
1da177e4
LT		 4778 .mmap = sock_no_mmap,
4779 .socketpair = sock_no_socketpair,
1da177e4
LT		 4780 .shutdown = l2cap_sock_shutdown,
4781 .setsockopt = l2cap_sock_setsockopt,
4782 .getsockopt = l2cap_sock_getsockopt
4783};
4784
ec1b4cf7 4785static const struct net_proto_family l2cap_sock_family_ops = {
1da177e4
LT		 4786 .family = PF_BLUETOOTH,
4787 .owner = THIS_MODULE,
4788 .create = l2cap_sock_create,
4789};
4790
4791static struct hci_proto l2cap_hci_proto = {
4792 .name = "L2CAP",
4793 .id = HCI_PROTO_L2CAP,
4794 .connect_ind = l2cap_connect_ind,
4795 .connect_cfm = l2cap_connect_cfm,
4796 .disconn_ind = l2cap_disconn_ind,
2950f21a 4797 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4798 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4799 .recv_acldata = l2cap_recv_acldata
4800};
4801
4802static int __init l2cap_init(void)
4803{
4804 int err;
be9d1227 4805
1da177e4
LT		 4806 err = proto_register(&l2cap_proto, 0);
4807 if (err < 0)
4808 return err;
4809
1890d36b
GP		 4810 _busy_wq = create_singlethread_workqueue("l2cap");
4811 if (!_busy_wq)
4812 goto error;
4813
1da177e4
LT		 4814 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4815 if (err < 0) {
4816 BT_ERR("L2CAP socket registration failed");
4817 goto error;
4818 }
4819
4820 err = hci_register_proto(&l2cap_hci_proto);
4821 if (err < 0) {
4822 BT_ERR("L2CAP protocol registration failed");
4823 bt_sock_unregister(BTPROTO_L2CAP);
4824 goto error;
4825 }
4826
aef7d97c
MH		 4827 if (bt_debugfs) {
4828 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4829 bt_debugfs, NULL, &l2cap_debugfs_fops);
4830 if (!l2cap_debugfs)
4831 BT_ERR("Failed to create L2CAP debug file");
4832 }
1da177e4
LT		 4833
4834 BT_INFO("L2CAP ver %s", VERSION);
4835 BT_INFO("L2CAP socket layer initialized");
4836
4837 return 0;
4838
4839error:
4840 proto_unregister(&l2cap_proto);
4841 return err;
4842}
4843
4844static void __exit l2cap_exit(void)
4845{
aef7d97c 4846 debugfs_remove(l2cap_debugfs);
1da177e4 4847
1890d36b
GP		 4848 flush_workqueue(_busy_wq);
4849 destroy_workqueue(_busy_wq);
4850
1da177e4
LT		 4851 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4852 BT_ERR("L2CAP socket unregistration failed");
4853
4854 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4855 BT_ERR("L2CAP protocol unregistration failed");
4856
4857 proto_unregister(&l2cap_proto);
4858}
4859
4860void l2cap_load(void)
4861{
4862 /* Dummy function to trigger automatic L2CAP module loading by
4863 * other modules that use L2CAP sockets but don't use any other
4864 * symbols from it. */
1da177e4
LT		 4865}
4866EXPORT_SYMBOL(l2cap_load);
4867
4868module_init(l2cap_init);
4869module_exit(l2cap_exit);
4870
d1c4a17d
GP		 4871module_param(disable_ertm, bool, 0644);
4872MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
44dd46de 4873
63fbd24e 4874MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 4875MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4876MODULE_VERSION(VERSION);
4877MODULE_LICENSE("GPL");
4878MODULE_ALIAS("bt-proto-0");
kernel source for telekom puls (alcatel/mediatek)