]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - net/bluetooth/l2cap.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Bluetooth: Check sk is not owned before freeing l2cap_conn
[mirror_ubuntu-bionic-kernel.git] / net / bluetooth / l2cap.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
ce5706bd 4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5d8868ff 5 Copyright (C) 2010 Google Inc.
1da177e4
LT		 6
7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License version 2 as
11 published by the Free Software Foundation;
12
13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
16 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 17 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
18 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21
8e87d142
YH		 22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 24 SOFTWARE IS DISCLAIMED.
25*/
26
27/* Bluetooth L2CAP core and sockets. */
28
1da177e4
LT		 29#include <linux/module.h>
30
31#include <linux/types.h>
4fc268d2 32#include <linux/capability.h>
1da177e4
LT		 33#include <linux/errno.h>
34#include <linux/kernel.h>
1da177e4
LT		 35#include <linux/sched.h>
36#include <linux/slab.h>
37#include <linux/poll.h>
38#include <linux/fcntl.h>
39#include <linux/init.h>
40#include <linux/interrupt.h>
41#include <linux/socket.h>
42#include <linux/skbuff.h>
1da177e4 43#include <linux/list.h>
be9d1227 44#include <linux/device.h>
aef7d97c
MH		 45#include <linux/debugfs.h>
46#include <linux/seq_file.h>
af05b30b 47#include <linux/uaccess.h>
fcc203c3 48#include <linux/crc16.h>
1da177e4
LT		 49#include <net/sock.h>
50
51#include <asm/system.h>
1da177e4
LT		 52#include <asm/unaligned.h>
53
54#include <net/bluetooth/bluetooth.h>
55#include <net/bluetooth/hci_core.h>
56#include <net/bluetooth/l2cap.h>
57
dd135240 58#define VERSION "2.15"
44dd46de 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
0fba2558
MM		 1011 if (la.l2_psm) {
1012 __u16 psm = __le16_to_cpu(la.l2_psm);
1013
1014 /* PSM must be odd and lsb of upper byte must be 0 */
1015 if ((psm & 0x0101) != 0x0001) {
1016 err = -EINVAL;
1017 goto done;
1018 }
1019
1020 /* Restrict usage of well-known PSMs */
1021 if (psm < 0x1001 && !capable(CAP_NET_BIND_SERVICE)) {
1022 err = -EACCES;
1023 goto done;
1024 }
847641d7 1025 }
8e87d142 1026
1da177e4
LT		 1027 write_lock_bh(&l2cap_sk_list.lock);
1028
f29972de 1029 if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
1da177e4
LT		 1030 err = -EADDRINUSE;
1031 } else {
1032 /* Save source address */
f29972de
MH		 1033 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
1034 l2cap_pi(sk)->psm = la.l2_psm;
1035 l2cap_pi(sk)->sport = la.l2_psm;
1da177e4 1036 sk->sk_state = BT_BOUND;
2af6b9d5 1037
b4324b5d
MH		 1038 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
1039 __le16_to_cpu(la.l2_psm) == 0x0003)
2af6b9d5 1040 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
1da177e4
LT		 1041 }
1042
1043 write_unlock_bh(&l2cap_sk_list.lock);
1044
1045done:
1046 release_sock(sk);
1047 return err;
1048}
1049
1050static int l2cap_do_connect(struct sock *sk)
1051{
1052 bdaddr_t *src = &bt_sk(sk)->src;
1053 bdaddr_t *dst = &bt_sk(sk)->dst;
1054 struct l2cap_conn *conn;
1055 struct hci_conn *hcon;
1056 struct hci_dev *hdev;
09ab6f4c 1057 __u8 auth_type;
44d0e48e 1058 int err;
1da177e4 1059
f29972de
MH		 1060 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
1061 l2cap_pi(sk)->psm);
1da177e4 1062
af05b30b
GP		 1063 hdev = hci_get_route(dst, src);
1064 if (!hdev)
1da177e4
LT		 1065 return -EHOSTUNREACH;
1066
1067 hci_dev_lock_bh(hdev);
1068
1069 err = -ENOMEM;
1070
8c1b2355 1071 if (sk->sk_type == SOCK_RAW) {
2af6b9d5
MH		 1072 switch (l2cap_pi(sk)->sec_level) {
1073 case BT_SECURITY_HIGH:
8c1b2355 1074 auth_type = HCI_AT_DEDICATED_BONDING_MITM;
2af6b9d5
MH		 1075 break;
1076 case BT_SECURITY_MEDIUM:
8c1b2355 1077 auth_type = HCI_AT_DEDICATED_BONDING;
2af6b9d5
MH		 1078 break;
1079 default:
09ab6f4c 1080 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 1081 break;
1082 }
8c1b2355 1083 } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
2af6b9d5 1084 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
8c1b2355 1085 auth_type = HCI_AT_NO_BONDING_MITM;
09ab6f4c 1086 else
8c1b2355 1087 auth_type = HCI_AT_NO_BONDING;
435fef20
MH		 1088
1089 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
1090 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
8c1b2355 1091 } else {
2af6b9d5
MH		 1092 switch (l2cap_pi(sk)->sec_level) {
1093 case BT_SECURITY_HIGH:
8c1b2355 1094 auth_type = HCI_AT_GENERAL_BONDING_MITM;
2af6b9d5
MH		 1095 break;
1096 case BT_SECURITY_MEDIUM:
09ab6f4c 1097 auth_type = HCI_AT_GENERAL_BONDING;
2af6b9d5
MH		 1098 break;
1099 default:
8c1b2355 1100 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 1101 break;
1102 }
09ab6f4c
MH		 1103 }
1104
2af6b9d5
MH		 1105 hcon = hci_connect(hdev, ACL_LINK, dst,
1106 l2cap_pi(sk)->sec_level, auth_type);
1da177e4
LT		 1107 if (!hcon)
1108 goto done;
1109
1110 conn = l2cap_conn_add(hcon, 0);
1111 if (!conn) {
1112 hci_conn_put(hcon);
1113 goto done;
1114 }
1115
1116 err = 0;
1117
1118 /* Update source addr of the socket */
1119 bacpy(src, conn->src);
1120
1121 l2cap_chan_add(conn, sk, NULL);
1122
1123 sk->sk_state = BT_CONNECT;
1124 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
1125
1126 if (hcon->state == BT_CONNECTED) {
bd3c9e25
GP		 1127 if (sk->sk_type != SOCK_SEQPACKET &&
1128 sk->sk_type != SOCK_STREAM) {
1da177e4
LT		 1129 l2cap_sock_clear_timer(sk);
1130 sk->sk_state = BT_CONNECTED;
79d554a6
MH		 1131 } else
1132 l2cap_do_start(sk);
1da177e4
LT		 1133 }
1134
1135done:
1136 hci_dev_unlock_bh(hdev);
1137 hci_dev_put(hdev);
1138 return err;
1139}
1140
1141static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
1142{
1da177e4 1143 struct sock *sk = sock->sk;
f29972de
MH		 1144 struct sockaddr_l2 la;
1145 int len, err = 0;
1da177e4 1146
1da177e4
LT		 1147 BT_DBG("sk %p", sk);
1148
6503d961
CG		 1149 if (!addr || alen < sizeof(addr->sa_family) ||
1150 addr->sa_family != AF_BLUETOOTH)
2a517ca6 1151 return -EINVAL;
1da177e4 1152
f29972de
MH		 1153 memset(&la, 0, sizeof(la));
1154 len = min_t(unsigned int, sizeof(la), alen);
1155 memcpy(&la, addr, len);
1156
2a517ca6
MH		 1157 if (la.l2_cid)
1158 return -EINVAL;
1159
1160 lock_sock(sk);
1161
bd3c9e25
GP		 1162 if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM)
1163 && !la.l2_psm) {
1da177e4
LT		 1164 err = -EINVAL;
1165 goto done;
1166 }
1167
c6b03cf9
MH		 1168 switch (l2cap_pi(sk)->mode) {
1169 case L2CAP_MODE_BASIC:
1170 break;
1171 case L2CAP_MODE_ERTM:
f2fcfcd6 1172 case L2CAP_MODE_STREAMING:
d1c4a17d 1173 if (!disable_ertm)
c6b03cf9
MH		 1174 break;
1175 /* fall through */
1176 default:
1177 err = -ENOTSUPP;
1178 goto done;
1179 }
1180
af05b30b 1181 switch (sk->sk_state) {
1da177e4
LT		 1182 case BT_CONNECT:
1183 case BT_CONNECT2:
1184 case BT_CONFIG:
1185 /* Already connecting */
1186 goto wait;
1187
1188 case BT_CONNECTED:
1189 /* Already connected */
8b0dc6dc 1190 err = -EISCONN;
1da177e4
LT		 1191 goto done;
1192
1193 case BT_OPEN:
1194 case BT_BOUND:
1195 /* Can connect */
1196 break;
1197
1198 default:
1199 err = -EBADFD;
1200 goto done;
1201 }
1202
0fba2558
MM		 1203 /* PSM must be odd and lsb of upper byte must be 0 */
1204 if ((__le16_to_cpu(la.l2_psm) & 0x0101) != 0x0001 &&
1205 sk->sk_type != SOCK_RAW) {
1206 err = -EINVAL;
1207 goto done;
1208 }
1209
1da177e4 1210 /* Set destination address and psm */
f29972de
MH		 1211 bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
1212 l2cap_pi(sk)->psm = la.l2_psm;
1da177e4 1213
af05b30b
GP		 1214 err = l2cap_do_connect(sk);
1215 if (err)
1da177e4
LT		 1216 goto done;
1217
1218wait:
1219 err = bt_sock_wait_state(sk, BT_CONNECTED,
1220 sock_sndtimeo(sk, flags & O_NONBLOCK));
1221done:
1222 release_sock(sk);
1223 return err;
1224}
1225
1226static int l2cap_sock_listen(struct socket *sock, int backlog)
1227{
1228 struct sock *sk = sock->sk;
1229 int err = 0;
1230
1231 BT_DBG("sk %p backlog %d", sk, backlog);
1232
1233 lock_sock(sk);
1234
bd3c9e25
GP		 1235 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
1236 || sk->sk_state != BT_BOUND) {
1da177e4
LT		 1237 err = -EBADFD;
1238 goto done;
1239 }
1240
c6b03cf9
MH		 1241 switch (l2cap_pi(sk)->mode) {
1242 case L2CAP_MODE_BASIC:
1243 break;
1244 case L2CAP_MODE_ERTM:
f2fcfcd6 1245 case L2CAP_MODE_STREAMING:
d1c4a17d 1246 if (!disable_ertm)
c6b03cf9
MH		 1247 break;
1248 /* fall through */
1249 default:
1250 err = -ENOTSUPP;
1251 goto done;
1252 }
1253
1da177e4
LT		 1254 if (!l2cap_pi(sk)->psm) {
1255 bdaddr_t *src = &bt_sk(sk)->src;
1256 u16 psm;
1257
1258 err = -EINVAL;
1259
1260 write_lock_bh(&l2cap_sk_list.lock);
1261
1262 for (psm = 0x1001; psm < 0x1100; psm += 2)
b4324b5d
MH		 1263 if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
1264 l2cap_pi(sk)->psm = cpu_to_le16(psm);
1265 l2cap_pi(sk)->sport = cpu_to_le16(psm);
1da177e4
LT		 1266 err = 0;
1267 break;
1268 }
1269
1270 write_unlock_bh(&l2cap_sk_list.lock);
1271
1272 if (err < 0)
1273 goto done;
1274 }
1275
1276 sk->sk_max_ack_backlog = backlog;
1277 sk->sk_ack_backlog = 0;
1278 sk->sk_state = BT_LISTEN;
1279
1280done:
1281 release_sock(sk);
1282 return err;
1283}
1284
1285static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
1286{
1287 DECLARE_WAITQUEUE(wait, current);
1288 struct sock *sk = sock->sk, *nsk;
1289 long timeo;
1290 int err = 0;
1291
fcc70d5f 1292 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1293
1294 if (sk->sk_state != BT_LISTEN) {
1295 err = -EBADFD;
1296 goto done;
1297 }
1298
1299 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1300
1301 BT_DBG("sk %p timeo %ld", sk, timeo);
1302
1303 /* Wait for an incoming connection. (wake-one). */
aa395145 1304 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 1305 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
1306 set_current_state(TASK_INTERRUPTIBLE);
1307 if (!timeo) {
1308 err = -EAGAIN;
1309 break;
1310 }
1311
1312 release_sock(sk);
1313 timeo = schedule_timeout(timeo);
fcc70d5f 1314 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1315
1316 if (sk->sk_state != BT_LISTEN) {
1317 err = -EBADFD;
1318 break;
1319 }
1320
1321 if (signal_pending(current)) {
1322 err = sock_intr_errno(timeo);
1323 break;
1324 }
1325 }
1326 set_current_state(TASK_RUNNING);
aa395145 1327 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 1328
1329 if (err)
1330 goto done;
1331
1332 newsock->state = SS_CONNECTED;
1333
1334 BT_DBG("new socket %p", nsk);
1335
1336done:
1337 release_sock(sk);
1338 return err;
1339}
1340
1341static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
1342{
1343 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
1344 struct sock *sk = sock->sk;
1345
1346 BT_DBG("sock %p, sk %p", sock, sk);
1347
1348 addr->sa_family = AF_BLUETOOTH;
1349 *len = sizeof(struct sockaddr_l2);
1350
f29972de
MH		 1351 if (peer) {
1352 la->l2_psm = l2cap_pi(sk)->psm;
1da177e4 1353 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
b4324b5d 1354 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
f29972de
MH		 1355 } else {
1356 la->l2_psm = l2cap_pi(sk)->sport;
1da177e4 1357 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
b4324b5d 1358 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
f29972de 1359 }
1da177e4 1360
1da177e4
LT		 1361 return 0;
1362}
1363
6161c038
GP		 1364static int __l2cap_wait_ack(struct sock *sk)
1365{
1366 DECLARE_WAITQUEUE(wait, current);
1367 int err = 0;
1368 int timeo = HZ/5;
1369
2b0b05dd 1370 add_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1371 while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) {
1372 set_current_state(TASK_INTERRUPTIBLE);
1373
1374 if (!timeo)
1375 timeo = HZ/5;
1376
1377 if (signal_pending(current)) {
1378 err = sock_intr_errno(timeo);
1379 break;
1380 }
1381
1382 release_sock(sk);
1383 timeo = schedule_timeout(timeo);
1384 lock_sock(sk);
1385
1386 err = sock_error(sk);
1387 if (err)
1388 break;
1389 }
1390 set_current_state(TASK_RUNNING);
2b0b05dd 1391 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1392 return err;
1393}
1394
e90bac06
GP		 1395static void l2cap_monitor_timeout(unsigned long arg)
1396{
1397 struct sock *sk = (void *) arg;
e90bac06 1398
0e98958d
GP		 1399 BT_DBG("sk %p", sk);
1400
e686219a 1401 bh_lock_sock(sk);
e90bac06 1402 if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
9b108fc0 1403 l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED);
b13f5860 1404 bh_unlock_sock(sk);
e90bac06
GP		 1405 return;
1406 }
1407
1408 l2cap_pi(sk)->retry_count++;
1409 __mod_monitor_timer();
1410
a2e12a2a 1411 l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
e686219a 1412 bh_unlock_sock(sk);
e90bac06
GP		 1413}
1414
1415static void l2cap_retrans_timeout(unsigned long arg)
1416{
1417 struct sock *sk = (void *) arg;
e90bac06 1418
0e98958d
GP		 1419 BT_DBG("sk %p", sk);
1420
e686219a 1421 bh_lock_sock(sk);
e90bac06
GP		 1422 l2cap_pi(sk)->retry_count = 1;
1423 __mod_monitor_timer();
1424
1425 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
1426
a2e12a2a 1427 l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
e686219a 1428 bh_unlock_sock(sk);
e90bac06
GP		 1429}
1430
1c2acffb 1431static void l2cap_drop_acked_frames(struct sock *sk)
1da177e4 1432{
1c2acffb 1433 struct sk_buff *skb;
1da177e4 1434
812e737e
GP		 1435 while ((skb = skb_peek(TX_QUEUE(sk))) &&
1436 l2cap_pi(sk)->unacked_frames) {
1c2acffb
GP		 1437 if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
1438 break;
1da177e4 1439
1c2acffb
GP		 1440 skb = skb_dequeue(TX_QUEUE(sk));
1441 kfree_skb(skb);
1da177e4 1442
1c2acffb
GP		 1443 l2cap_pi(sk)->unacked_frames--;
1444 }
1da177e4 1445
e90bac06
GP		 1446 if (!l2cap_pi(sk)->unacked_frames)
1447 del_timer(&l2cap_pi(sk)->retrans_timer);
1c2acffb 1448}
1da177e4 1449
9a9c6a34 1450static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
1c2acffb
GP		 1451{
1452 struct l2cap_pinfo *pi = l2cap_pi(sk);
1c2acffb
GP		 1453
1454 BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
1da177e4 1455
9a9c6a34 1456 hci_send_acl(pi->conn->hcon, skb, 0);
1c2acffb
GP		 1457}
1458
305682e8 1459static void l2cap_streaming_send(struct sock *sk)
6840ed07 1460{
ccbb84af 1461 struct sk_buff *skb;
6840ed07 1462 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1463 u16 control, fcs;
6840ed07 1464
ccbb84af
GP		 1465 while ((skb = skb_dequeue(TX_QUEUE(sk)))) {
1466 control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
6840ed07 1467 control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
ccbb84af 1468 put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
6840ed07 1469
e8235c6b 1470 if (pi->fcs == L2CAP_FCS_CRC16) {
ccbb84af
GP		 1471 fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
1472 put_unaligned_le16(fcs, skb->data + skb->len - 2);
fcc203c3
GP		 1473 }
1474
ccbb84af 1475 l2cap_do_send(sk, skb);
6840ed07
GP		 1476
1477 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
6840ed07 1478 }
6840ed07
GP		 1479}
1480
dfc909be 1481static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq)
8f17154f
GP		 1482{
1483 struct l2cap_pinfo *pi = l2cap_pi(sk);
1484 struct sk_buff *skb, *tx_skb;
1485 u16 control, fcs;
8f17154f
GP		 1486
1487 skb = skb_peek(TX_QUEUE(sk));
f11d676d
GP		 1488 if (!skb)
1489 return;
8f17154f 1490
f11d676d
GP		 1491 do {
1492 if (bt_cb(skb)->tx_seq == tx_seq)
8f17154f 1493 break;
8f17154f 1494
f11d676d
GP		 1495 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1496 return;
8f17154f 1497
f11d676d 1498 } while ((skb = skb_queue_next(TX_QUEUE(sk), skb)));
8f17154f 1499
f11d676d
GP		 1500 if (pi->remote_max_tx &&
1501 bt_cb(skb)->retries == pi->remote_max_tx) {
9b108fc0 1502 l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
f11d676d
GP		 1503 return;
1504 }
1505
1506 tx_skb = skb_clone(skb, GFP_ATOMIC);
1507 bt_cb(skb)->retries++;
1508 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
3cb123d1
GP		 1509
1510 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1511 control |= L2CAP_CTRL_FINAL;
1512 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1513 }
95ffa978 1514
f11d676d
GP		 1515 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1516 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
3cb123d1 1517
f11d676d
GP		 1518 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1519
1520 if (pi->fcs == L2CAP_FCS_CRC16) {
1521 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1522 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1523 }
1524
1525 l2cap_do_send(sk, tx_skb);
8f17154f
GP		 1526}
1527
1c2acffb
GP		 1528static int l2cap_ertm_send(struct sock *sk)
1529{
1530 struct sk_buff *skb, *tx_skb;
1531 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1532 u16 control, fcs;
9a9c6a34 1533 int nsent = 0;
1c2acffb 1534
c13ffa62
GP		 1535 if (sk->sk_state != BT_CONNECTED)
1536 return -ENOTCONN;
e90bac06 1537
6e2b6722 1538 while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) {
1c2acffb 1539
e90bac06
GP		 1540 if (pi->remote_max_tx &&
1541 bt_cb(skb)->retries == pi->remote_max_tx) {
9b108fc0 1542 l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
e90bac06
GP		 1543 break;
1544 }
1545
e420aba3
AE		 1546 tx_skb = skb_clone(skb, GFP_ATOMIC);
1547
e90bac06
GP		 1548 bt_cb(skb)->retries++;
1549
1c2acffb 1550 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
95ffa978
GP		 1551 control &= L2CAP_CTRL_SAR;
1552
d5392c8f
GP		 1553 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1554 control |= L2CAP_CTRL_FINAL;
1555 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1556 }
9f121a5a 1557 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1c2acffb
GP		 1558 | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1559 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1560
e90bac06 1561
e8235c6b 1562 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1563 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1564 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1565 }
1566
9a9c6a34
GP		 1567 l2cap_do_send(sk, tx_skb);
1568
e90bac06 1569 __mod_retrans_timer();
1c2acffb
GP		 1570
1571 bt_cb(skb)->tx_seq = pi->next_tx_seq;
1572 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1573
1574 pi->unacked_frames++;
d5392c8f 1575 pi->frames_sent++;
1c2acffb
GP		 1576
1577 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1578 sk->sk_send_head = NULL;
1579 else
1580 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
9e917af1
GP		 1581
1582 nsent++;
1c2acffb
GP		 1583 }
1584
9e917af1
GP		 1585 return nsent;
1586}
1587
dfc909be
GP		 1588static int l2cap_retransmit_frames(struct sock *sk)
1589{
1590 struct l2cap_pinfo *pi = l2cap_pi(sk);
1591 int ret;
1592
dfc909be
GP		 1593 if (!skb_queue_empty(TX_QUEUE(sk)))
1594 sk->sk_send_head = TX_QUEUE(sk)->next;
1595
1596 pi->next_tx_seq = pi->expected_ack_seq;
1597 ret = l2cap_ertm_send(sk);
dfc909be
GP		 1598 return ret;
1599}
1600
9a9c6a34 1601static void l2cap_send_ack(struct l2cap_pinfo *pi)
9e917af1
GP		 1602{
1603 struct sock *sk = (struct sock *)pi;
1604 u16 control = 0;
1605
1606 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1607
1608 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1609 control |= L2CAP_SUPER_RCV_NOT_READY;
1890d36b 1610 pi->conn_state |= L2CAP_CONN_RNR_SENT;
9a9c6a34
GP		 1611 l2cap_send_sframe(pi, control);
1612 return;
9e917af1 1613 }
dfc909be 1614
e0f66218 1615 if (l2cap_ertm_send(sk) > 0)
dfc909be
GP		 1616 return;
1617
1618 control |= L2CAP_SUPER_RCV_READY;
1619 l2cap_send_sframe(pi, control);
1c2acffb
GP		 1620}
1621
9a9c6a34 1622static void l2cap_send_srejtail(struct sock *sk)
99b0d4b7
GP		 1623{
1624 struct srej_list *tail;
1625 u16 control;
1626
1627 control = L2CAP_SUPER_SELECT_REJECT;
1628 control |= L2CAP_CTRL_FINAL;
1629
1630 tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
1631 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1632
1633 l2cap_send_sframe(l2cap_pi(sk), control);
99b0d4b7
GP		 1634}
1635
1c2acffb
GP		 1636static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1637{
1638 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1639 struct sk_buff **frag;
1640 int err, sent = 0;
1da177e4 1641
59203a21 1642 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1643 return -EFAULT;
1da177e4
LT		 1644
1645 sent += count;
1646 len -= count;
1647
1648 /* Continuation fragments (no L2CAP header) */
1649 frag = &skb_shinfo(skb)->frag_list;
1650 while (len) {
1651 count = min_t(unsigned int, conn->mtu, len);
1652
1653 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1654 if (!*frag)
0175d629 1655 return err;
1c2acffb
GP		 1656 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1657 return -EFAULT;
1da177e4
LT		 1658
1659 sent += count;
1660 len -= count;
1661
1662 frag = &(*frag)->next;
1663 }
1da177e4
LT		 1664
1665 return sent;
1c2acffb 1666}
1da177e4 1667
1c2acffb
GP		 1668static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1669{
1670 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1671 struct sk_buff *skb;
1672 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1673 struct l2cap_hdr *lh;
1674
1675 BT_DBG("sk %p len %d", sk, (int)len);
1676
1677 count = min_t(unsigned int, (conn->mtu - hlen), len);
1678 skb = bt_skb_send_alloc(sk, count + hlen,
1679 msg->msg_flags & MSG_DONTWAIT, &err);
1680 if (!skb)
0175d629 1681 return ERR_PTR(err);
1c2acffb
GP		 1682
1683 /* Create L2CAP header */
1684 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1685 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1686 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1687 put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
1688
1689 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1690 if (unlikely(err < 0)) {
1691 kfree_skb(skb);
1692 return ERR_PTR(err);
1693 }
1694 return skb;
1695}
1696
1697static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1698{
1699 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1700 struct sk_buff *skb;
1701 int err, count, hlen = L2CAP_HDR_SIZE;
1702 struct l2cap_hdr *lh;
1703
1704 BT_DBG("sk %p len %d", sk, (int)len);
1705
1706 count = min_t(unsigned int, (conn->mtu - hlen), len);
1707 skb = bt_skb_send_alloc(sk, count + hlen,
1708 msg->msg_flags & MSG_DONTWAIT, &err);
1709 if (!skb)
0175d629 1710 return ERR_PTR(err);
1c2acffb
GP		 1711
1712 /* Create L2CAP header */
1713 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1714 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1715 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1716
1717 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1718 if (unlikely(err < 0)) {
1719 kfree_skb(skb);
1720 return ERR_PTR(err);
1721 }
1722 return skb;
1723}
1724
6840ed07 1725static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1c2acffb
GP		 1726{
1727 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1728 struct sk_buff *skb;
1729 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1730 struct l2cap_hdr *lh;
1731
1732 BT_DBG("sk %p len %d", sk, (int)len);
1733
0ee0d208
GP		 1734 if (!conn)
1735 return ERR_PTR(-ENOTCONN);
1736
c74e560c
GP		 1737 if (sdulen)
1738 hlen += 2;
1739
fcc203c3
GP		 1740 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1741 hlen += 2;
1742
1c2acffb
GP		 1743 count = min_t(unsigned int, (conn->mtu - hlen), len);
1744 skb = bt_skb_send_alloc(sk, count + hlen,
1745 msg->msg_flags & MSG_DONTWAIT, &err);
1746 if (!skb)
0175d629 1747 return ERR_PTR(err);
1c2acffb
GP		 1748
1749 /* Create L2CAP header */
1750 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1751 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1752 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1753 put_unaligned_le16(control, skb_put(skb, 2));
c74e560c
GP		 1754 if (sdulen)
1755 put_unaligned_le16(sdulen, skb_put(skb, 2));
1c2acffb
GP		 1756
1757 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1758 if (unlikely(err < 0)) {
1759 kfree_skb(skb);
1760 return ERR_PTR(err);
1761 }
e90bac06 1762
fcc203c3
GP		 1763 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1764 put_unaligned_le16(0, skb_put(skb, 2));
1765
e90bac06 1766 bt_cb(skb)->retries = 0;
1c2acffb 1767 return skb;
1da177e4
LT		 1768}
1769
c74e560c
GP		 1770static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
1771{
1772 struct l2cap_pinfo *pi = l2cap_pi(sk);
1773 struct sk_buff *skb;
1774 struct sk_buff_head sar_queue;
1775 u16 control;
1776 size_t size = 0;
1777
ff12fd64 1778 skb_queue_head_init(&sar_queue);
c74e560c 1779 control = L2CAP_SDU_START;
1c762159 1780 skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len);
c74e560c
GP		 1781 if (IS_ERR(skb))
1782 return PTR_ERR(skb);
1783
1784 __skb_queue_tail(&sar_queue, skb);
1c762159
GP		 1785 len -= pi->remote_mps;
1786 size += pi->remote_mps;
c74e560c
GP		 1787
1788 while (len > 0) {
1789 size_t buflen;
1790
1c762159 1791 if (len > pi->remote_mps) {
44651b85 1792 control = L2CAP_SDU_CONTINUE;
1c762159 1793 buflen = pi->remote_mps;
c74e560c 1794 } else {
44651b85 1795 control = L2CAP_SDU_END;
c74e560c
GP		 1796 buflen = len;
1797 }
1798
6840ed07 1799 skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0);
c74e560c
GP		 1800 if (IS_ERR(skb)) {
1801 skb_queue_purge(&sar_queue);
1802 return PTR_ERR(skb);
1803 }
1804
1805 __skb_queue_tail(&sar_queue, skb);
1806 len -= buflen;
1807 size += buflen;
c74e560c
GP		 1808 }
1809 skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
1810 if (sk->sk_send_head == NULL)
1811 sk->sk_send_head = sar_queue.next;
1812
1813 return size;
1814}
1815
1da177e4
LT		 1816static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
1817{
1818 struct sock *sk = sock->sk;
1c2acffb
GP		 1819 struct l2cap_pinfo *pi = l2cap_pi(sk);
1820 struct sk_buff *skb;
1821 u16 control;
1822 int err;
1da177e4
LT		 1823
1824 BT_DBG("sock %p, sk %p", sock, sk);
1825
c1cbe4b7
BL		 1826 err = sock_error(sk);
1827 if (err)
1828 return err;
1da177e4
LT		 1829
1830 if (msg->msg_flags & MSG_OOB)
1831 return -EOPNOTSUPP;
1832
1da177e4
LT		 1833 lock_sock(sk);
1834
1c2acffb 1835 if (sk->sk_state != BT_CONNECTED) {
1da177e4 1836 err = -ENOTCONN;
1c2acffb
GP		 1837 goto done;
1838 }
1da177e4 1839
1c2acffb
GP		 1840 /* Connectionless channel */
1841 if (sk->sk_type == SOCK_DGRAM) {
1842 skb = l2cap_create_connless_pdu(sk, msg, len);
9a9c6a34 1843 if (IS_ERR(skb)) {
477fffb0 1844 err = PTR_ERR(skb);
9a9c6a34
GP		 1845 } else {
1846 l2cap_do_send(sk, skb);
1847 err = len;
1848 }
1c2acffb
GP		 1849 goto done;
1850 }
1851
1852 switch (pi->mode) {
1853 case L2CAP_MODE_BASIC:
c69163e9
GP		 1854 /* Check outgoing MTU */
1855 if (len > pi->omtu) {
f9dd11b0 1856 err = -EMSGSIZE;
c69163e9
GP		 1857 goto done;
1858 }
1859
1c2acffb
GP		 1860 /* Create a basic PDU */
1861 skb = l2cap_create_basic_pdu(sk, msg, len);
1862 if (IS_ERR(skb)) {
1863 err = PTR_ERR(skb);
1864 goto done;
1865 }
1866
9a9c6a34
GP		 1867 l2cap_do_send(sk, skb);
1868 err = len;
1c2acffb
GP		 1869 break;
1870
1871 case L2CAP_MODE_ERTM:
6840ed07 1872 case L2CAP_MODE_STREAMING:
1c2acffb 1873 /* Entire SDU fits into one PDU */
1c762159 1874 if (len <= pi->remote_mps) {
1c2acffb 1875 control = L2CAP_SDU_UNSEGMENTED;
6840ed07 1876 skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
1c2acffb
GP		 1877 if (IS_ERR(skb)) {
1878 err = PTR_ERR(skb);
1879 goto done;
1880 }
c74e560c 1881 __skb_queue_tail(TX_QUEUE(sk), skb);
dfc909be 1882
c74e560c
GP		 1883 if (sk->sk_send_head == NULL)
1884 sk->sk_send_head = skb;
dfc909be 1885
1c2acffb 1886 } else {
c74e560c
GP		 1887 /* Segment SDU into multiples PDUs */
1888 err = l2cap_sar_segment_sdu(sk, msg, len);
1889 if (err < 0)
1890 goto done;
1c2acffb 1891 }
1c2acffb 1892
dfc909be 1893 if (pi->mode == L2CAP_MODE_STREAMING) {
305682e8 1894 l2cap_streaming_send(sk);
dfc909be 1895 } else {
6e2b6722
GP		 1896 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY &&
1897 pi->conn_state && L2CAP_CONN_WAIT_F) {
1898 err = len;
1899 break;
1900 }
6840ed07 1901 err = l2cap_ertm_send(sk);
dfc909be 1902 }
6840ed07 1903
9e917af1 1904 if (err >= 0)
1c2acffb
GP		 1905 err = len;
1906 break;
1907
1908 default:
1909 BT_DBG("bad state %1.1x", pi->mode);
bc766db2 1910 err = -EBADFD;
1c2acffb
GP		 1911 }
1912
1913done:
1da177e4
LT		 1914 release_sock(sk);
1915 return err;
1916}
1917
f66dc81f
MH		 1918static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
1919{
1920 struct sock *sk = sock->sk;
1921
1922 lock_sock(sk);
1923
1924 if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
1925 struct l2cap_conn_rsp rsp;
e9aeb2dd
GP		 1926 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1927 u8 buf[128];
f66dc81f
MH		 1928
1929 sk->sk_state = BT_CONFIG;
1930
1931 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1932 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
1933 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1934 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1935 l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
1936 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1937
e9aeb2dd
GP		 1938 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) {
1939 release_sock(sk);
1940 return 0;
1941 }
1942
1943 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
1944 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1945 l2cap_build_conf_req(sk, buf), buf);
1946 l2cap_pi(sk)->num_conf_req++;
1947
f66dc81f
MH		 1948 release_sock(sk);
1949 return 0;
1950 }
1951
1952 release_sock(sk);
1953
6fdf482b
MM		 1954 if (sock->type == SOCK_STREAM)
1955 return bt_sock_stream_recvmsg(iocb, sock, msg, len, flags);
1956
f66dc81f
MH		 1957 return bt_sock_recvmsg(iocb, sock, msg, len, flags);
1958}
1959
b7058842 1960static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 1961{
1962 struct sock *sk = sock->sk;
1963 struct l2cap_options opts;
f29972de 1964 int len, err = 0;
1da177e4
LT		 1965 u32 opt;
1966
1967 BT_DBG("sk %p", sk);
1968
1969 lock_sock(sk);
1970
1971 switch (optname) {
1972 case L2CAP_OPTIONS:
eaa71b31
GP		 1973 if (sk->sk_state == BT_CONNECTED) {
1974 err = -EINVAL;
1975 break;
1976 }
1977
0878b666
MH		 1978 opts.imtu = l2cap_pi(sk)->imtu;
1979 opts.omtu = l2cap_pi(sk)->omtu;
1980 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 1981 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 1982 opts.fcs = l2cap_pi(sk)->fcs;
68d7f0ce 1983 opts.max_tx = l2cap_pi(sk)->max_tx;
14b5aa71 1984 opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
0878b666 1985
1da177e4
LT		 1986 len = min_t(unsigned int, sizeof(opts), optlen);
1987 if (copy_from_user((char *) &opts, optval, len)) {
1988 err = -EFAULT;
1989 break;
1990 }
0878b666 1991
45d65c46
GP		 1992 if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
1993 err = -EINVAL;
1994 break;
1995 }
1996
0041ecfa
JPRV		 1997 l2cap_pi(sk)->mode = opts.mode;
1998 switch (l2cap_pi(sk)->mode) {
1999 case L2CAP_MODE_BASIC:
85eb53c6 2000 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE;
0041ecfa
JPRV		 2001 break;
2002 case L2CAP_MODE_ERTM:
2003 case L2CAP_MODE_STREAMING:
d1c4a17d 2004 if (!disable_ertm)
0041ecfa
JPRV		 2005 break;
2006 /* fall through */
2007 default:
2008 err = -EINVAL;
2009 break;
2010 }
2011
c6b03cf9
MH		 2012 l2cap_pi(sk)->imtu = opts.imtu;
2013 l2cap_pi(sk)->omtu = opts.omtu;
fcc203c3 2014 l2cap_pi(sk)->fcs = opts.fcs;
68d7f0ce 2015 l2cap_pi(sk)->max_tx = opts.max_tx;
14b5aa71 2016 l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size;
1da177e4
LT		 2017 break;
2018
2019 case L2CAP_LM:
2020 if (get_user(opt, (u32 __user *) optval)) {
2021 err = -EFAULT;
2022 break;
2023 }
2024
2af6b9d5
MH		 2025 if (opt & L2CAP_LM_AUTH)
2026 l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
2027 if (opt & L2CAP_LM_ENCRYPT)
2028 l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
2029 if (opt & L2CAP_LM_SECURE)
2030 l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
2031
2032 l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
2033 l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
1da177e4
LT		 2034 break;
2035
2036 default:
2037 err = -ENOPROTOOPT;
2038 break;
2039 }
2040
2041 release_sock(sk);
2042 return err;
2043}
2044
b7058842 2045static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
d58daf42
MH		 2046{
2047 struct sock *sk = sock->sk;
2af6b9d5
MH		 2048 struct bt_security sec;
2049 int len, err = 0;
f66dc81f 2050 u32 opt;
d58daf42
MH		 2051
2052 BT_DBG("sk %p", sk);
2053
2054 if (level == SOL_L2CAP)
2055 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
2056
0588d94f
MH		 2057 if (level != SOL_BLUETOOTH)
2058 return -ENOPROTOOPT;
2059
d58daf42
MH		 2060 lock_sock(sk);
2061
2062 switch (optname) {
2af6b9d5 2063 case BT_SECURITY:
bd3c9e25
GP		 2064 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
2065 && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 2066 err = -EINVAL;
2067 break;
2068 }
2069
2af6b9d5
MH		 2070 sec.level = BT_SECURITY_LOW;
2071
2072 len = min_t(unsigned int, sizeof(sec), optlen);
2073 if (copy_from_user((char *) &sec, optval, len)) {
2074 err = -EFAULT;
2075 break;
2076 }
2077
2078 if (sec.level < BT_SECURITY_LOW ||
2079 sec.level > BT_SECURITY_HIGH) {
2080 err = -EINVAL;
2081 break;
2082 }
2083
2084 l2cap_pi(sk)->sec_level = sec.level;
2085 break;
2086
f66dc81f
MH		 2087 case BT_DEFER_SETUP:
2088 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2089 err = -EINVAL;
2090 break;
2091 }
2092
2093 if (get_user(opt, (u32 __user *) optval)) {
2094 err = -EFAULT;
2095 break;
2096 }
2097
2098 bt_sk(sk)->defer_setup = opt;
2099 break;
2100
d58daf42
MH		 2101 default:
2102 err = -ENOPROTOOPT;
2103 break;
2104 }
2105
2106 release_sock(sk);
2107 return err;
2108}
2109
2110static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
1da177e4
LT		 2111{
2112 struct sock *sk = sock->sk;
2113 struct l2cap_options opts;
2114 struct l2cap_conninfo cinfo;
2115 int len, err = 0;
2af6b9d5 2116 u32 opt;
1da177e4
LT		 2117
2118 BT_DBG("sk %p", sk);
2119
2120 if (get_user(len, optlen))
2121 return -EFAULT;
2122
2123 lock_sock(sk);
2124
2125 switch (optname) {
2126 case L2CAP_OPTIONS:
2127 opts.imtu = l2cap_pi(sk)->imtu;
2128 opts.omtu = l2cap_pi(sk)->omtu;
2129 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 2130 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 2131 opts.fcs = l2cap_pi(sk)->fcs;
68d7f0ce 2132 opts.max_tx = l2cap_pi(sk)->max_tx;
14b5aa71 2133 opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
1da177e4
LT		 2134
2135 len = min_t(unsigned int, len, sizeof(opts));
2136 if (copy_to_user(optval, (char *) &opts, len))
2137 err = -EFAULT;
2138
2139 break;
2140
2141 case L2CAP_LM:
2af6b9d5
MH		 2142 switch (l2cap_pi(sk)->sec_level) {
2143 case BT_SECURITY_LOW:
2144 opt = L2CAP_LM_AUTH;
2145 break;
2146 case BT_SECURITY_MEDIUM:
2147 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
2148 break;
2149 case BT_SECURITY_HIGH:
2150 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
2151 L2CAP_LM_SECURE;
2152 break;
2153 default:
2154 opt = 0;
2155 break;
2156 }
2157
2158 if (l2cap_pi(sk)->role_switch)
2159 opt |= L2CAP_LM_MASTER;
2160
2161 if (l2cap_pi(sk)->force_reliable)
2162 opt |= L2CAP_LM_RELIABLE;
2163
2164 if (put_user(opt, (u32 __user *) optval))
1da177e4
LT		 2165 err = -EFAULT;
2166 break;
2167
2168 case L2CAP_CONNINFO:
f66dc81f
MH		 2169 if (sk->sk_state != BT_CONNECTED &&
2170 !(sk->sk_state == BT_CONNECT2 &&
2171 bt_sk(sk)->defer_setup)) {
1da177e4
LT		 2172 err = -ENOTCONN;
2173 break;
2174 }
2175
2176 cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
2177 memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
2178
2179 len = min_t(unsigned int, len, sizeof(cinfo));
2180 if (copy_to_user(optval, (char *) &cinfo, len))
2181 err = -EFAULT;
2182
2183 break;
2184
2185 default:
2186 err = -ENOPROTOOPT;
2187 break;
2188 }
2189
2190 release_sock(sk);
2191 return err;
2192}
2193
d58daf42
MH		 2194static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
2195{
2196 struct sock *sk = sock->sk;
2af6b9d5 2197 struct bt_security sec;
d58daf42
MH		 2198 int len, err = 0;
2199
2200 BT_DBG("sk %p", sk);
2201
2202 if (level == SOL_L2CAP)
2203 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
2204
0588d94f
MH		 2205 if (level != SOL_BLUETOOTH)
2206 return -ENOPROTOOPT;
2207
d58daf42
MH		 2208 if (get_user(len, optlen))
2209 return -EFAULT;
2210
2211 lock_sock(sk);
2212
2213 switch (optname) {
2af6b9d5 2214 case BT_SECURITY:
bd3c9e25
GP		 2215 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
2216 && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 2217 err = -EINVAL;
2218 break;
2219 }
2220
2af6b9d5
MH		 2221 sec.level = l2cap_pi(sk)->sec_level;
2222
2223 len = min_t(unsigned int, len, sizeof(sec));
2224 if (copy_to_user(optval, (char *) &sec, len))
2225 err = -EFAULT;
2226
2227 break;
2228
f66dc81f
MH		 2229 case BT_DEFER_SETUP:
2230 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2231 err = -EINVAL;
2232 break;
2233 }
2234
2235 if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
2236 err = -EFAULT;
2237
2238 break;
2239
d58daf42
MH		 2240 default:
2241 err = -ENOPROTOOPT;
2242 break;
2243 }
2244
2245 release_sock(sk);
2246 return err;
2247}
2248
1da177e4
LT		 2249static int l2cap_sock_shutdown(struct socket *sock, int how)
2250{
2251 struct sock *sk = sock->sk;
2252 int err = 0;
2253
2254 BT_DBG("sock %p, sk %p", sock, sk);
2255
2256 if (!sk)
2257 return 0;
2258
2259 lock_sock(sk);
2260 if (!sk->sk_shutdown) {
6161c038
GP		 2261 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2262 err = __l2cap_wait_ack(sk);
2263
1da177e4
LT		 2264 sk->sk_shutdown = SHUTDOWN_MASK;
2265 l2cap_sock_clear_timer(sk);
2266 __l2cap_sock_close(sk, 0);
2267
2268 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
b1235d79
MH		 2269 err = bt_sock_wait_state(sk, BT_CLOSED,
2270 sk->sk_lingertime);
1da177e4 2271 }
9b108fc0
GP		 2272
2273 if (!err && sk->sk_err)
2274 err = -sk->sk_err;
2275
1da177e4
LT		 2276 release_sock(sk);
2277 return err;
2278}
2279
2280static int l2cap_sock_release(struct socket *sock)
2281{
2282 struct sock *sk = sock->sk;
2283 int err;
2284
2285 BT_DBG("sock %p, sk %p", sock, sk);
2286
2287 if (!sk)
2288 return 0;
2289
2290 err = l2cap_sock_shutdown(sock, 2);
2291
2292 sock_orphan(sk);
2293 l2cap_sock_kill(sk);
2294 return err;
2295}
2296
1da177e4
LT		 2297static void l2cap_chan_ready(struct sock *sk)
2298{
2299 struct sock *parent = bt_sk(sk)->parent;
2300
2301 BT_DBG("sk %p, parent %p", sk, parent);
2302
2303 l2cap_pi(sk)->conf_state = 0;
2304 l2cap_sock_clear_timer(sk);
2305
2306 if (!parent) {
2307 /* Outgoing channel.
2308 * Wake up socket sleeping on connect.
2309 */
2310 sk->sk_state = BT_CONNECTED;
2311 sk->sk_state_change(sk);
2312 } else {
2313 /* Incoming channel.
2314 * Wake up socket sleeping on accept.
2315 */
2316 parent->sk_data_ready(parent, 0);
2317 }
2318}
2319
2320/* Copy frame to all raw sockets on that connection */
2321static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2322{
2323 struct l2cap_chan_list *l = &conn->chan_list;
2324 struct sk_buff *nskb;
af05b30b 2325 struct sock *sk;
1da177e4
LT		 2326
2327 BT_DBG("conn %p", conn);
2328
2329 read_lock(&l->lock);
2330 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2331 if (sk->sk_type != SOCK_RAW)
2332 continue;
2333
2334 /* Don't send frame to the socket it came from */
2335 if (skb->sk == sk)
2336 continue;
af05b30b
GP		 2337 nskb = skb_clone(skb, GFP_ATOMIC);
2338 if (!nskb)
1da177e4
LT		 2339 continue;
2340
2341 if (sock_queue_rcv_skb(sk, nskb))
2342 kfree_skb(nskb);
2343 }
2344 read_unlock(&l->lock);
2345}
2346
2347/* ---- L2CAP signalling commands ---- */
2348static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2349 u8 code, u8 ident, u16 dlen, void *data)
2350{
2351 struct sk_buff *skb, **frag;
2352 struct l2cap_cmd_hdr *cmd;
2353 struct l2cap_hdr *lh;
2354 int len, count;
2355
af05b30b
GP		 2356 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2357 conn, code, ident, dlen);
1da177e4
LT		 2358
2359 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2360 count = min_t(unsigned int, conn->mtu, len);
2361
2362 skb = bt_skb_alloc(count, GFP_ATOMIC);
2363 if (!skb)
2364 return NULL;
2365
2366 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2367 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
8db4dc46 2368 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2369
2370 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2371 cmd->code = code;
2372 cmd->ident = ident;
aca3192c 2373 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2374
2375 if (dlen) {
2376 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2377 memcpy(skb_put(skb, count), data, count);
2378 data += count;
2379 }
2380
2381 len -= skb->len;
2382
2383 /* Continuation fragments (no L2CAP header) */
2384 frag = &skb_shinfo(skb)->frag_list;
2385 while (len) {
2386 count = min_t(unsigned int, conn->mtu, len);
2387
2388 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2389 if (!*frag)
2390 goto fail;
2391
2392 memcpy(skb_put(*frag, count), data, count);
2393
2394 len -= count;
2395 data += count;
2396
2397 frag = &(*frag)->next;
2398 }
2399
2400 return skb;
2401
2402fail:
2403 kfree_skb(skb);
2404 return NULL;
2405}
2406
2407static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2408{
2409 struct l2cap_conf_opt *opt = *ptr;
2410 int len;
2411
2412 len = L2CAP_CONF_OPT_SIZE + opt->len;
2413 *ptr += len;
2414
2415 *type = opt->type;
2416 *olen = opt->len;
2417
2418 switch (opt->len) {
2419 case 1:
2420 *val = *((u8 *) opt->val);
2421 break;
2422
2423 case 2:
bfaaeb3e 2424 *val = get_unaligned_le16(opt->val);
1da177e4
LT		 2425 break;
2426
2427 case 4:
bfaaeb3e 2428 *val = get_unaligned_le32(opt->val);
1da177e4
LT		 2429 break;
2430
2431 default:
2432 *val = (unsigned long) opt->val;
2433 break;
2434 }
2435
2436 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2437 return len;
2438}
2439
1da177e4
LT		 2440static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2441{
2442 struct l2cap_conf_opt *opt = *ptr;
2443
2444 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2445
2446 opt->type = type;
2447 opt->len = len;
2448
2449 switch (len) {
2450 case 1:
2451 *((u8 *) opt->val) = val;
2452 break;
2453
2454 case 2:
4f8b691c 2455 put_unaligned_le16(val, opt->val);
1da177e4
LT		 2456 break;
2457
2458 case 4:
4f8b691c 2459 put_unaligned_le32(val, opt->val);
1da177e4
LT		 2460 break;
2461
2462 default:
2463 memcpy(opt->val, (void *) val, len);
2464 break;
2465 }
2466
2467 *ptr += L2CAP_CONF_OPT_SIZE + len;
2468}
2469
c1b4f43b
GP		 2470static void l2cap_ack_timeout(unsigned long arg)
2471{
2472 struct sock *sk = (void *) arg;
2473
2474 bh_lock_sock(sk);
2475 l2cap_send_ack(l2cap_pi(sk));
2476 bh_unlock_sock(sk);
2477}
2478
0565c1c2
GP		 2479static inline void l2cap_ertm_init(struct sock *sk)
2480{
2481 l2cap_pi(sk)->expected_ack_seq = 0;
2482 l2cap_pi(sk)->unacked_frames = 0;
2483 l2cap_pi(sk)->buffer_seq = 0;
803020c6 2484 l2cap_pi(sk)->num_acked = 0;
d5392c8f 2485 l2cap_pi(sk)->frames_sent = 0;
0565c1c2
GP		 2486
2487 setup_timer(&l2cap_pi(sk)->retrans_timer,
2488 l2cap_retrans_timeout, (unsigned long) sk);
2489 setup_timer(&l2cap_pi(sk)->monitor_timer,
2490 l2cap_monitor_timeout, (unsigned long) sk);
c1b4f43b
GP		 2491 setup_timer(&l2cap_pi(sk)->ack_timer,
2492 l2cap_ack_timeout, (unsigned long) sk);
0565c1c2
GP		 2493
2494 __skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b
GP		 2495 __skb_queue_head_init(BUSY_QUEUE(sk));
2496
2497 INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work);
218bb9df
GP		 2498
2499 sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
0565c1c2
GP		 2500}
2501
f2fcfcd6
GP		 2502static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2503{
2504 switch (mode) {
2505 case L2CAP_MODE_STREAMING:
2506 case L2CAP_MODE_ERTM:
2507 if (l2cap_mode_supported(mode, remote_feat_mask))
2508 return mode;
2509 /* fall through */
2510 default:
2511 return L2CAP_MODE_BASIC;
2512 }
2513}
2514
1da177e4
LT		 2515static int l2cap_build_conf_req(struct sock *sk, void *data)
2516{
2517 struct l2cap_pinfo *pi = l2cap_pi(sk);
2518 struct l2cap_conf_req *req = data;
bd3c9e25 2519 struct l2cap_conf_rfc rfc = { .mode = pi->mode };
1da177e4
LT		 2520 void *ptr = req->data;
2521
2522 BT_DBG("sk %p", sk);
2523
f2fcfcd6
GP		 2524 if (pi->num_conf_req || pi->num_conf_rsp)
2525 goto done;
2526
2527 switch (pi->mode) {
2528 case L2CAP_MODE_STREAMING:
2529 case L2CAP_MODE_ERTM:
2ba13ed6 2530 if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE)
85eb53c6 2531 break;
85eb53c6 2532
2ba13ed6 2533 /* fall through */
f2fcfcd6
GP		 2534 default:
2535 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2536 break;
2537 }
2538
2539done:
65c7c491
MH		 2540 switch (pi->mode) {
2541 case L2CAP_MODE_BASIC:
2542 if (pi->imtu != L2CAP_DEFAULT_MTU)
2543 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
62547752 2544
63406504
GP		 2545 if (!(pi->conn->feat_mask & L2CAP_FEAT_ERTM) &&
2546 !(pi->conn->feat_mask & L2CAP_FEAT_STREAMING))
2547 break;
2548
62547752
GP		 2549 rfc.mode = L2CAP_MODE_BASIC;
2550 rfc.txwin_size = 0;
2551 rfc.max_transmit = 0;
2552 rfc.retrans_timeout = 0;
2553 rfc.monitor_timeout = 0;
2554 rfc.max_pdu_size = 0;
2555
63406504
GP		 2556 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2557 (unsigned long) &rfc);
65c7c491
MH		 2558 break;
2559
2560 case L2CAP_MODE_ERTM:
2561 rfc.mode = L2CAP_MODE_ERTM;
14b5aa71 2562 rfc.txwin_size = pi->tx_win;
68d7f0ce 2563 rfc.max_transmit = pi->max_tx;
f2fcfcd6
GP		 2564 rfc.retrans_timeout = 0;
2565 rfc.monitor_timeout = 0;
c74e560c 2566 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2567 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2568 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
f2fcfcd6 2569
63406504
GP		 2570 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2571 (unsigned long) &rfc);
2572
fcc203c3
GP		 2573 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2574 break;
2575
2576 if (pi->fcs == L2CAP_FCS_NONE ||
2577 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2578 pi->fcs = L2CAP_FCS_NONE;
2579 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2580 }
f2fcfcd6
GP		 2581 break;
2582
2583 case L2CAP_MODE_STREAMING:
2584 rfc.mode = L2CAP_MODE_STREAMING;
2585 rfc.txwin_size = 0;
2586 rfc.max_transmit = 0;
2587 rfc.retrans_timeout = 0;
2588 rfc.monitor_timeout = 0;
c74e560c 2589 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2590 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2591 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
65c7c491 2592
63406504
GP		 2593 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2594 (unsigned long) &rfc);
2595
fcc203c3
GP		 2596 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2597 break;
2598
2599 if (pi->fcs == L2CAP_FCS_NONE ||
2600 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2601 pi->fcs = L2CAP_FCS_NONE;
2602 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2603 }
65c7c491
MH		 2604 break;
2605 }
1da177e4
LT		 2606
2607 /* FIXME: Need actual value of the flush timeout */
2608 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2609 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2610
aca3192c
YH		 2611 req->dcid = cpu_to_le16(pi->dcid);
2612 req->flags = cpu_to_le16(0);
1da177e4
LT		 2613
2614 return ptr - data;
2615}
2616
5dee9e7c 2617static int l2cap_parse_conf_req(struct sock *sk, void *data)
1da177e4
LT		 2618{
2619 struct l2cap_pinfo *pi = l2cap_pi(sk);
5dee9e7c
MH		 2620 struct l2cap_conf_rsp *rsp = data;
2621 void *ptr = rsp->data;
2622 void *req = pi->conf_req;
2623 int len = pi->conf_len;
2624 int type, hint, olen;
2625 unsigned long val;
6464f35f 2626 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 2627 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2628 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2629
5dee9e7c 2630 BT_DBG("sk %p", sk);
820ae1b8 2631
5dee9e7c
MH		 2632 while (len >= L2CAP_CONF_OPT_SIZE) {
2633 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2634
589d2746 2635 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2636 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2637
2638 switch (type) {
2639 case L2CAP_CONF_MTU:
861d6882 2640 mtu = val;
5dee9e7c
MH		 2641 break;
2642
2643 case L2CAP_CONF_FLUSH_TO:
2644 pi->flush_to = val;
2645 break;
2646
2647 case L2CAP_CONF_QOS:
2648 break;
2649
6464f35f
MH		 2650 case L2CAP_CONF_RFC:
2651 if (olen == sizeof(rfc))
2652 memcpy(&rfc, (void *) val, olen);
2653 break;
2654
fcc203c3
GP		 2655 case L2CAP_CONF_FCS:
2656 if (val == L2CAP_FCS_NONE)
2657 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2658
2659 break;
2660
5dee9e7c
MH		 2661 default:
2662 if (hint)
2663 break;
2664
2665 result = L2CAP_CONF_UNKNOWN;
2666 *((u8 *) ptr++) = type;
2667 break;
2668 }
2669 }
2670
e9aeb2dd 2671 if (pi->num_conf_rsp || pi->num_conf_req > 1)
f2fcfcd6
GP		 2672 goto done;
2673
2674 switch (pi->mode) {
2675 case L2CAP_MODE_STREAMING:
2676 case L2CAP_MODE_ERTM:
85eb53c6
GP		 2677 if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
2678 pi->mode = l2cap_select_mode(rfc.mode,
2679 pi->conn->feat_mask);
2680 break;
2681 }
2682
742e519b 2683 if (pi->mode != rfc.mode)
f2fcfcd6 2684 return -ECONNREFUSED;
742e519b 2685
f2fcfcd6 2686 break;
f2fcfcd6
GP		 2687 }
2688
2689done:
2690 if (pi->mode != rfc.mode) {
2691 result = L2CAP_CONF_UNACCEPT;
2692 rfc.mode = pi->mode;
2693
2694 if (pi->num_conf_rsp == 1)
2695 return -ECONNREFUSED;
2696
2697 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2698 sizeof(rfc), (unsigned long) &rfc);
2699 }
2700
2701
5dee9e7c
MH		 2702 if (result == L2CAP_CONF_SUCCESS) {
2703 /* Configure output options and let the other side know
2704 * which ones we don't like. */
2705
f2fcfcd6
GP		 2706 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2707 result = L2CAP_CONF_UNACCEPT;
2708 else {
2709 pi->omtu = mtu;
2710 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2711 }
2712 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
6464f35f 2713
f2fcfcd6
GP		 2714 switch (rfc.mode) {
2715 case L2CAP_MODE_BASIC:
2716 pi->fcs = L2CAP_FCS_NONE;
2717 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2718 break;
2719
2720 case L2CAP_MODE_ERTM:
2721 pi->remote_tx_win = rfc.txwin_size;
2722 pi->remote_max_tx = rfc.max_transmit;
86b1b263
MM		 2723
2724 if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10)
2725 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
1c762159
GP		 2726
2727 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6 2728
10467e9e
GP		 2729 rfc.retrans_timeout =
2730 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2731 rfc.monitor_timeout =
2732 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6
GP		 2733
2734 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2735
2736 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2737 sizeof(rfc), (unsigned long) &rfc);
2738
f2fcfcd6
GP		 2739 break;
2740
2741 case L2CAP_MODE_STREAMING:
86b1b263
MM		 2742 if (le16_to_cpu(rfc.max_pdu_size) > pi->conn->mtu - 10)
2743 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
1c762159
GP		 2744
2745 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2746
2747 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2748
2749 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2750 sizeof(rfc), (unsigned long) &rfc);
2751
f2fcfcd6
GP		 2752 break;
2753
2754 default:
5dee9e7c 2755 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2756
6464f35f 2757 memset(&rfc, 0, sizeof(rfc));
f2fcfcd6
GP		 2758 rfc.mode = pi->mode;
2759 }
6464f35f 2760
f2fcfcd6
GP		 2761 if (result == L2CAP_CONF_SUCCESS)
2762 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2763 }
5dee9e7c
MH		 2764 rsp->scid = cpu_to_le16(pi->dcid);
2765 rsp->result = cpu_to_le16(result);
2766 rsp->flags = cpu_to_le16(0x0000);
2767
2768 return ptr - data;
1da177e4
LT		 2769}
2770
f2fcfcd6
GP		 2771static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2772{
2773 struct l2cap_pinfo *pi = l2cap_pi(sk);
2774 struct l2cap_conf_req *req = data;
2775 void *ptr = req->data;
2776 int type, olen;
2777 unsigned long val;
2778 struct l2cap_conf_rfc rfc;
2779
2780 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2781
2782 while (len >= L2CAP_CONF_OPT_SIZE) {
2783 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2784
2785 switch (type) {
2786 case L2CAP_CONF_MTU:
2787 if (val < L2CAP_DEFAULT_MIN_MTU) {
2788 *result = L2CAP_CONF_UNACCEPT;
8183b775 2789 pi->imtu = L2CAP_DEFAULT_MIN_MTU;
f2fcfcd6 2790 } else
8183b775
AE		 2791 pi->imtu = val;
2792 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
f2fcfcd6
GP		 2793 break;
2794
2795 case L2CAP_CONF_FLUSH_TO:
2796 pi->flush_to = val;
2797 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2798 2, pi->flush_to);
2799 break;
2800
2801 case L2CAP_CONF_RFC:
2802 if (olen == sizeof(rfc))
2803 memcpy(&rfc, (void *)val, olen);
2804
2805 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2806 rfc.mode != pi->mode)
2807 return -ECONNREFUSED;
2808
f2fcfcd6
GP		 2809 pi->fcs = 0;
2810
2811 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2812 sizeof(rfc), (unsigned long) &rfc);
2813 break;
2814 }
2815 }
2816
6c2ea7a8
GP		 2817 if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode)
2818 return -ECONNREFUSED;
2819
2820 pi->mode = rfc.mode;
2821
f2fcfcd6
GP		 2822 if (*result == L2CAP_CONF_SUCCESS) {
2823 switch (rfc.mode) {
2824 case L2CAP_MODE_ERTM:
10467e9e
GP		 2825 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2826 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
1c762159 2827 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2828 break;
2829 case L2CAP_MODE_STREAMING:
1c762159 2830 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2831 }
2832 }
2833
2834 req->dcid = cpu_to_le16(pi->dcid);
2835 req->flags = cpu_to_le16(0x0000);
2836
2837 return ptr - data;
2838}
2839
5dee9e7c 2840static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1da177e4
LT		 2841{
2842 struct l2cap_conf_rsp *rsp = data;
2843 void *ptr = rsp->data;
1da177e4 2844
5dee9e7c 2845 BT_DBG("sk %p", sk);
1da177e4 2846
aca3192c 2847 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
5dee9e7c 2848 rsp->result = cpu_to_le16(result);
aca3192c 2849 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2850
2851 return ptr - data;
2852}
2853
7b1c0049
GP		 2854static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
2855{
2856 struct l2cap_pinfo *pi = l2cap_pi(sk);
2857 int type, olen;
2858 unsigned long val;
2859 struct l2cap_conf_rfc rfc;
2860
2861 BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
2862
2863 if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
2864 return;
2865
2866 while (len >= L2CAP_CONF_OPT_SIZE) {
2867 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2868
2869 switch (type) {
2870 case L2CAP_CONF_RFC:
2871 if (olen == sizeof(rfc))
2872 memcpy(&rfc, (void *)val, olen);
2873 goto done;
2874 }
2875 }
2876
2877done:
2878 switch (rfc.mode) {
2879 case L2CAP_MODE_ERTM:
10467e9e
GP		 2880 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2881 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
7b1c0049
GP		 2882 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2883 break;
2884 case L2CAP_MODE_STREAMING:
2885 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2886 }
2887}
2888
4e8402a3
MH		 2889static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2890{
2891 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2892
2893 if (rej->reason != 0x0000)
2894 return 0;
2895
2896 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2897 cmd->ident == conn->info_ident) {
4e8402a3 2898 del_timer(&conn->info_timer);
984947dc
MH		 2899
2900 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2901 conn->info_ident = 0;
984947dc 2902
4e8402a3
MH		 2903 l2cap_conn_start(conn);
2904 }
2905
2906 return 0;
2907}
2908
1da177e4
LT		 2909static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2910{
2911 struct l2cap_chan_list *list = &conn->chan_list;
2912 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2913 struct l2cap_conn_rsp rsp;
d793fe8c 2914 struct sock *parent, *sk = NULL;
e7c29cb1 2915 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2916
2917 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2918 __le16 psm = req->psm;
1da177e4
LT		 2919
2920 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2921
2922 /* Check if we have socket listening on psm */
2923 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2924 if (!parent) {
2925 result = L2CAP_CR_BAD_PSM;
2926 goto sendresp;
2927 }
2928
e7c29cb1
MH		 2929 /* Check if the ACL is secure enough (if not SDP) */
2930 if (psm != cpu_to_le16(0x0001) &&
2931 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2932 conn->disc_reason = 0x05;
e7c29cb1
MH		 2933 result = L2CAP_CR_SEC_BLOCK;
2934 goto response;
2935 }
2936
1da177e4
LT		 2937 result = L2CAP_CR_NO_MEM;
2938
2939 /* Check for backlog size */
2940 if (sk_acceptq_is_full(parent)) {
8e87d142 2941 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2942 goto response;
2943 }
2944
3b1e0a65 2945 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1da177e4
LT		 2946 if (!sk)
2947 goto response;
2948
fd1278d7 2949 write_lock_bh(&list->lock);
1da177e4
LT		 2950
2951 /* Check if we already have channel with that dcid */
2952 if (__l2cap_get_chan_by_dcid(list, scid)) {
fd1278d7 2953 write_unlock_bh(&list->lock);
1da177e4
LT		 2954 sock_set_flag(sk, SOCK_ZAPPED);
2955 l2cap_sock_kill(sk);
2956 goto response;
2957 }
2958
2959 hci_conn_hold(conn->hcon);
2960
2961 l2cap_sock_init(sk, parent);
2962 bacpy(&bt_sk(sk)->src, conn->src);
2963 bacpy(&bt_sk(sk)->dst, conn->dst);
2964 l2cap_pi(sk)->psm = psm;
2965 l2cap_pi(sk)->dcid = scid;
2966
2967 __l2cap_chan_add(conn, sk, parent);
2968 dcid = l2cap_pi(sk)->scid;
2969
2970 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2971
1da177e4
LT		 2972 l2cap_pi(sk)->ident = cmd->ident;
2973
984947dc 2974 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2af6b9d5 2975 if (l2cap_check_security(sk)) {
f66dc81f
MH		 2976 if (bt_sk(sk)->defer_setup) {
2977 sk->sk_state = BT_CONNECT2;
2978 result = L2CAP_CR_PEND;
2979 status = L2CAP_CS_AUTHOR_PEND;
2980 parent->sk_data_ready(parent, 0);
2981 } else {
2982 sk->sk_state = BT_CONFIG;
2983 result = L2CAP_CR_SUCCESS;
2984 status = L2CAP_CS_NO_INFO;
2985 }
79d554a6
MH		 2986 } else {
2987 sk->sk_state = BT_CONNECT2;
2988 result = L2CAP_CR_PEND;
2989 status = L2CAP_CS_AUTHEN_PEND;
2990 }
2991 } else {
2992 sk->sk_state = BT_CONNECT2;
2993 result = L2CAP_CR_PEND;
2994 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2995 }
2996
fd1278d7 2997 write_unlock_bh(&list->lock);
1da177e4
LT		 2998
2999response:
3000 bh_unlock_sock(parent);
3001
3002sendresp:
aca3192c
YH		 3003 rsp.scid = cpu_to_le16(scid);
3004 rsp.dcid = cpu_to_le16(dcid);
3005 rsp.result = cpu_to_le16(result);
3006 rsp.status = cpu_to_le16(status);
1da177e4 3007 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 3008
3009 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3010 struct l2cap_info_req info;
3011 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3012
3013 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3014 conn->info_ident = l2cap_get_ident(conn);
3015
3016 mod_timer(&conn->info_timer, jiffies +
3017 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
3018
3019 l2cap_send_cmd(conn, conn->info_ident,
3020 L2CAP_INFO_REQ, sizeof(info), &info);
3021 }
3022
d793fe8c 3023 if (sk && !(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) &&
e9aeb2dd
GP		 3024 result == L2CAP_CR_SUCCESS) {
3025 u8 buf[128];
3026 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
3027 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3028 l2cap_build_conf_req(sk, buf), buf);
3029 l2cap_pi(sk)->num_conf_req++;
3030 }
3031
1da177e4
LT		 3032 return 0;
3033}
3034
3035static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3036{
3037 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3038 u16 scid, dcid, result, status;
3039 struct sock *sk;
3040 u8 req[128];
3041
3042 scid = __le16_to_cpu(rsp->scid);
3043 dcid = __le16_to_cpu(rsp->dcid);
3044 result = __le16_to_cpu(rsp->result);
3045 status = __le16_to_cpu(rsp->status);
3046
3047 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
3048
3049 if (scid) {
af05b30b
GP		 3050 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3051 if (!sk)
57d3b22b 3052 return -EFAULT;
1da177e4 3053 } else {
af05b30b
GP		 3054 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
3055 if (!sk)
57d3b22b 3056 return -EFAULT;
1da177e4
LT		 3057 }
3058
3059 switch (result) {
3060 case L2CAP_CR_SUCCESS:
3061 sk->sk_state = BT_CONFIG;
3062 l2cap_pi(sk)->ident = 0;
3063 l2cap_pi(sk)->dcid = dcid;
6a8d3010
MH		 3064 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
3065
e9aeb2dd
GP		 3066 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)
3067 break;
3068
3069 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
3070
1da177e4
LT		 3071 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3072 l2cap_build_conf_req(sk, req), req);
f2fcfcd6 3073 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3074 break;
3075
3076 case L2CAP_CR_PEND:
6a8d3010 3077 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 3078 break;
3079
3080 default:
a49184c2
AE		 3081 /* don't delete l2cap channel if sk is owned by user */
3082 if (sock_owned_by_user(sk)) {
3083 sk->sk_state = BT_DISCONN;
3084 l2cap_sock_clear_timer(sk);
3085 l2cap_sock_set_timer(sk, HZ / 5);
3086 break;
3087 }
3088
1da177e4
LT		 3089 l2cap_chan_del(sk, ECONNREFUSED);
3090 break;
3091 }
3092
3093 bh_unlock_sock(sk);
3094 return 0;
3095}
3096
8c462b60
MM		 3097static inline void set_default_fcs(struct l2cap_pinfo *pi)
3098{
3099 /* FCS is enabled only in ERTM or streaming mode, if one or both
3100 * sides request it.
3101 */
3102 if (pi->mode != L2CAP_MODE_ERTM && pi->mode != L2CAP_MODE_STREAMING)
3103 pi->fcs = L2CAP_FCS_NONE;
3104 else if (!(pi->conf_state & L2CAP_CONF_NO_FCS_RECV))
3105 pi->fcs = L2CAP_FCS_CRC16;
3106}
3107
88219a0f 3108static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3109{
3110 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3111 u16 dcid, flags;
3112 u8 rsp[64];
3113 struct sock *sk;
5dee9e7c 3114 int len;
1da177e4
LT		 3115
3116 dcid = __le16_to_cpu(req->dcid);
3117 flags = __le16_to_cpu(req->flags);
3118
3119 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3120
af05b30b
GP		 3121 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3122 if (!sk)
1da177e4
LT		 3123 return -ENOENT;
3124
b0239c80 3125 if (sk->sk_state == BT_DISCONN)
354f60a9
MH		 3126 goto unlock;
3127
5dee9e7c 3128 /* Reject if config buffer is too small. */
88219a0f 3129 len = cmd_len - sizeof(*req);
5dee9e7c
MH		 3130 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
3131 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3132 l2cap_build_conf_rsp(sk, rsp,
3133 L2CAP_CONF_REJECT, flags), rsp);
3134 goto unlock;
3135 }
3136
3137 /* Store config. */
3138 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
3139 l2cap_pi(sk)->conf_len += len;
1da177e4
LT		 3140
3141 if (flags & 0x0001) {
3142 /* Incomplete config. Send empty response. */
3143 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
5dee9e7c
MH		 3144 l2cap_build_conf_rsp(sk, rsp,
3145 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 3146 goto unlock;
3147 }
3148
3149 /* Complete config. */
5dee9e7c 3150 len = l2cap_parse_conf_req(sk, rsp);
f2fcfcd6 3151 if (len < 0) {
9b108fc0 3152 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4 3153 goto unlock;
f2fcfcd6 3154 }
1da177e4 3155
5dee9e7c 3156 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
f2fcfcd6 3157 l2cap_pi(sk)->num_conf_rsp++;
5dee9e7c 3158
5dee9e7c
MH		 3159 /* Reset config buffer. */
3160 l2cap_pi(sk)->conf_len = 0;
3161
876d9484
MH		 3162 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
3163 goto unlock;
3164
1da177e4 3165 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
8c462b60 3166 set_default_fcs(l2cap_pi(sk));
fcc203c3 3167
1da177e4 3168 sk->sk_state = BT_CONNECTED;
e90bac06 3169
0565c1c2
GP		 3170 l2cap_pi(sk)->next_tx_seq = 0;
3171 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3172 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3173 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3174 l2cap_ertm_init(sk);
3175
1da177e4 3176 l2cap_chan_ready(sk);
876d9484
MH		 3177 goto unlock;
3178 }
3179
3180 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 3181 u8 buf[64];
ab3e5715 3182 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
1da177e4 3183 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
79d554a6 3184 l2cap_build_conf_req(sk, buf), buf);
f2fcfcd6 3185 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3186 }
3187
3188unlock:
3189 bh_unlock_sock(sk);
3190 return 0;
3191}
3192
3193static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3194{
3195 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3196 u16 scid, flags, result;
3197 struct sock *sk;
7b1c0049 3198 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 3199
3200 scid = __le16_to_cpu(rsp->scid);
3201 flags = __le16_to_cpu(rsp->flags);
3202 result = __le16_to_cpu(rsp->result);
3203
af05b30b
GP		 3204 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
3205 scid, flags, result);
1da177e4 3206
af05b30b
GP		 3207 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3208 if (!sk)
1da177e4
LT		 3209 return 0;
3210
3211 switch (result) {
3212 case L2CAP_CONF_SUCCESS:
7b1c0049 3213 l2cap_conf_rfc_get(sk, rsp->data, len);
1da177e4
LT		 3214 break;
3215
3216 case L2CAP_CONF_UNACCEPT:
f2fcfcd6 3217 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3218 char req[64];
3219
c2c77ec8 3220 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
9b108fc0 3221 l2cap_send_disconn_req(conn, sk, ECONNRESET);
c2c77ec8
AE		 3222 goto done;
3223 }
3224
f2fcfcd6
GP		 3225 /* throw out any old stored conf requests */
3226 result = L2CAP_CONF_SUCCESS;
3227 len = l2cap_parse_conf_rsp(sk, rsp->data,
3228 len, req, &result);
3229 if (len < 0) {
9b108fc0 3230 l2cap_send_disconn_req(conn, sk, ECONNRESET);
f2fcfcd6
GP		 3231 goto done;
3232 }
3233
3234 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3235 L2CAP_CONF_REQ, len, req);
3236 l2cap_pi(sk)->num_conf_req++;
3237 if (result != L2CAP_CONF_SUCCESS)
3238 goto done;
3239 break;
1da177e4
LT		 3240 }
3241
8e87d142 3242 default:
b1235d79 3243 sk->sk_err = ECONNRESET;
1da177e4 3244 l2cap_sock_set_timer(sk, HZ * 5);
9b108fc0 3245 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4
LT		 3246 goto done;
3247 }
3248
3249 if (flags & 0x01)
3250 goto done;
3251
1da177e4
LT		 3252 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
3253
3254 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
8c462b60 3255 set_default_fcs(l2cap_pi(sk));
fcc203c3 3256
1da177e4 3257 sk->sk_state = BT_CONNECTED;
0565c1c2 3258 l2cap_pi(sk)->next_tx_seq = 0;
1c2acffb 3259 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3260 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3261 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3262 l2cap_ertm_init(sk);
3263
1da177e4
LT		 3264 l2cap_chan_ready(sk);
3265 }
3266
3267done:
3268 bh_unlock_sock(sk);
3269 return 0;
3270}
3271
3272static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3273{
3274 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3275 struct l2cap_disconn_rsp rsp;
3276 u16 dcid, scid;
3277 struct sock *sk;
3278
3279 scid = __le16_to_cpu(req->scid);
3280 dcid = __le16_to_cpu(req->dcid);
3281
3282 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3283
af05b30b
GP		 3284 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3285 if (!sk)
1da177e4
LT		 3286 return 0;
3287
aca3192c
YH		 3288 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3289 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1da177e4
LT		 3290 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3291
3292 sk->sk_shutdown = SHUTDOWN_MASK;
3293
a49184c2
AE		 3294 /* don't delete l2cap channel if sk is owned by user */
3295 if (sock_owned_by_user(sk)) {
3296 sk->sk_state = BT_DISCONN;
3297 l2cap_sock_clear_timer(sk);
3298 l2cap_sock_set_timer(sk, HZ / 5);
3299 bh_unlock_sock(sk);
3300 return 0;
3301 }
3302
1da177e4
LT		 3303 l2cap_chan_del(sk, ECONNRESET);
3304 bh_unlock_sock(sk);
3305
3306 l2cap_sock_kill(sk);
3307 return 0;
3308}
3309
3310static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3311{
3312 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3313 u16 dcid, scid;
3314 struct sock *sk;
3315
3316 scid = __le16_to_cpu(rsp->scid);
3317 dcid = __le16_to_cpu(rsp->dcid);
3318
3319 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3320
af05b30b
GP		 3321 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3322 if (!sk)
1da177e4
LT		 3323 return 0;
3324
a49184c2
AE		 3325 /* don't delete l2cap channel if sk is owned by user */
3326 if (sock_owned_by_user(sk)) {
3327 sk->sk_state = BT_DISCONN;
3328 l2cap_sock_clear_timer(sk);
3329 l2cap_sock_set_timer(sk, HZ / 5);
3330 bh_unlock_sock(sk);
3331 return 0;
3332 }
3333
1da177e4
LT		 3334 l2cap_chan_del(sk, 0);
3335 bh_unlock_sock(sk);
3336
3337 l2cap_sock_kill(sk);
3338 return 0;
3339}
3340
3341static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3342{
3343 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3344 u16 type;
3345
3346 type = __le16_to_cpu(req->type);
3347
3348 BT_DBG("type 0x%4.4x", type);
3349
f0709e03
MH		 3350 if (type == L2CAP_IT_FEAT_MASK) {
3351 u8 buf[8];
44dd46de 3352 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3353 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3354 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3355 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
d1c4a17d 3356 if (!disable_ertm)
fcc203c3
GP		 3357 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3358 | L2CAP_FEAT_FCS;
1b7bf4ed 3359 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3360 l2cap_send_cmd(conn, cmd->ident,
3361 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3362 } else if (type == L2CAP_IT_FIXED_CHAN) {
3363 u8 buf[12];
3364 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3365 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3366 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3367 memcpy(buf + 4, l2cap_fixed_chan, 8);
3368 l2cap_send_cmd(conn, cmd->ident,
3369 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3370 } else {
3371 struct l2cap_info_rsp rsp;
3372 rsp.type = cpu_to_le16(type);
3373 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3374 l2cap_send_cmd(conn, cmd->ident,
3375 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3376 }
1da177e4
LT		 3377
3378 return 0;
3379}
3380
3381static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3382{
3383 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3384 u16 type, result;
3385
3386 type = __le16_to_cpu(rsp->type);
3387 result = __le16_to_cpu(rsp->result);
3388
3389 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3390
4e8402a3
MH		 3391 del_timer(&conn->info_timer);
3392
adb08ede
VT		 3393 if (result != L2CAP_IR_SUCCESS) {
3394 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3395 conn->info_ident = 0;
3396
3397 l2cap_conn_start(conn);
3398
3399 return 0;
3400 }
3401
984947dc 3402 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3403 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3404
47ec1dcd 3405 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3406 struct l2cap_info_req req;
3407 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3408
3409 conn->info_ident = l2cap_get_ident(conn);
3410
3411 l2cap_send_cmd(conn, conn->info_ident,
3412 L2CAP_INFO_REQ, sizeof(req), &req);
3413 } else {
3414 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3415 conn->info_ident = 0;
3416
3417 l2cap_conn_start(conn);
3418 }
3419 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3420 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3421 conn->info_ident = 0;
984947dc
MH		 3422
3423 l2cap_conn_start(conn);
3424 }
4e8402a3 3425
1da177e4
LT		 3426 return 0;
3427}
3428
3429static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3430{
3431 u8 *data = skb->data;
3432 int len = skb->len;
3433 struct l2cap_cmd_hdr cmd;
3434 int err = 0;
3435
3436 l2cap_raw_recv(conn, skb);
3437
3438 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3439 u16 cmd_len;
1da177e4
LT		 3440 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3441 data += L2CAP_CMD_HDR_SIZE;
3442 len -= L2CAP_CMD_HDR_SIZE;
3443
88219a0f 3444 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3445
88219a0f 3446 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3447
88219a0f 3448 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3449 BT_DBG("corrupted command");
3450 break;
3451 }
3452
3453 switch (cmd.code) {
3454 case L2CAP_COMMAND_REJ:
4e8402a3 3455 l2cap_command_rej(conn, &cmd, data);
1da177e4
LT		 3456 break;
3457
3458 case L2CAP_CONN_REQ:
3459 err = l2cap_connect_req(conn, &cmd, data);
3460 break;
3461
3462 case L2CAP_CONN_RSP:
3463 err = l2cap_connect_rsp(conn, &cmd, data);
3464 break;
3465
3466 case L2CAP_CONF_REQ:
88219a0f 3467 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1da177e4
LT		 3468 break;
3469
3470 case L2CAP_CONF_RSP:
3471 err = l2cap_config_rsp(conn, &cmd, data);
3472 break;
3473
3474 case L2CAP_DISCONN_REQ:
3475 err = l2cap_disconnect_req(conn, &cmd, data);
3476 break;
3477
3478 case L2CAP_DISCONN_RSP:
3479 err = l2cap_disconnect_rsp(conn, &cmd, data);
3480 break;
3481
3482 case L2CAP_ECHO_REQ:
88219a0f 3483 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1da177e4
LT		 3484 break;
3485
3486 case L2CAP_ECHO_RSP:
3487 break;
3488
3489 case L2CAP_INFO_REQ:
3490 err = l2cap_information_req(conn, &cmd, data);
3491 break;
3492
3493 case L2CAP_INFO_RSP:
3494 err = l2cap_information_rsp(conn, &cmd, data);
3495 break;
3496
3497 default:
3498 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3499 err = -EINVAL;
3500 break;
3501 }
3502
3503 if (err) {
3504 struct l2cap_cmd_rej rej;
3505 BT_DBG("error %d", err);
3506
3507 /* FIXME: Map err to a valid reason */
aca3192c 3508 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3509 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3510 }
3511
88219a0f
AV		 3512 data += cmd_len;
3513 len -= cmd_len;
1da177e4
LT		 3514 }
3515
3516 kfree_skb(skb);
3517}
3518
fcc203c3
GP		 3519static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3520{
3521 u16 our_fcs, rcv_fcs;
3522 int hdr_size = L2CAP_HDR_SIZE + 2;
3523
3524 if (pi->fcs == L2CAP_FCS_CRC16) {
3525 skb_trim(skb, skb->len - 2);
3526 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3527 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3528
3529 if (our_fcs != rcv_fcs)
7a560e5c 3530 return -EBADMSG;
fcc203c3
GP		 3531 }
3532 return 0;
3533}
3534
d5392c8f
GP		 3535static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3536{
3537 struct l2cap_pinfo *pi = l2cap_pi(sk);
3538 u16 control = 0;
3539
3540 pi->frames_sent = 0;
d5392c8f
GP		 3541
3542 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3543
3544 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
64988868 3545 control |= L2CAP_SUPER_RCV_NOT_READY;
d5392c8f 3546 l2cap_send_sframe(pi, control);
1890d36b 3547 pi->conn_state |= L2CAP_CONN_RNR_SENT;
d5392c8f
GP		 3548 }
3549
4ea727ef
GP		 3550 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY)
3551 l2cap_retransmit_frames(sk);
d5392c8f
GP		 3552
3553 l2cap_ertm_send(sk);
3554
3555 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3556 pi->frames_sent == 0) {
3557 control |= L2CAP_SUPER_RCV_READY;
d5392c8f
GP		 3558 l2cap_send_sframe(pi, control);
3559 }
3560}
3561
9b53350d 3562static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
8f17154f
GP		 3563{
3564 struct sk_buff *next_skb;
bfbacc11
JPRV		 3565 struct l2cap_pinfo *pi = l2cap_pi(sk);
3566 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3567
3568 bt_cb(skb)->tx_seq = tx_seq;
3569 bt_cb(skb)->sar = sar;
3570
3571 next_skb = skb_peek(SREJ_QUEUE(sk));
3572 if (!next_skb) {
3573 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d 3574 return 0;
8f17154f
GP		 3575 }
3576
bfbacc11
JPRV		 3577 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3578 if (tx_seq_offset < 0)
3579 tx_seq_offset += 64;
3580
8f17154f 3581 do {
9b53350d
JPRV		 3582 if (bt_cb(next_skb)->tx_seq == tx_seq)
3583 return -EINVAL;
3584
bfbacc11
JPRV		 3585 next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
3586 pi->buffer_seq) % 64;
3587 if (next_tx_seq_offset < 0)
3588 next_tx_seq_offset += 64;
3589
3590 if (next_tx_seq_offset > tx_seq_offset) {
8f17154f 3591 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
9b53350d 3592 return 0;
8f17154f
GP		 3593 }
3594
3595 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3596 break;
3597
59203a21 3598 } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
8f17154f
GP		 3599
3600 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d
JPRV		 3601
3602 return 0;
8f17154f
GP		 3603}
3604
18778a63
GP		 3605static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3606{
3607 struct l2cap_pinfo *pi = l2cap_pi(sk);
3608 struct sk_buff *_skb;
1890d36b 3609 int err;
18778a63
GP		 3610
3611 switch (control & L2CAP_CTRL_SAR) {
3612 case L2CAP_SDU_UNSEGMENTED:
3613 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3614 goto drop;
3615
3616 err = sock_queue_rcv_skb(sk, skb);
3617 if (!err)
3618 return err;
3619
3620 break;
3621
3622 case L2CAP_SDU_START:
3623 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3624 goto drop;
3625
3626 pi->sdu_len = get_unaligned_le16(skb->data);
18778a63
GP		 3627
3628 if (pi->sdu_len > pi->imtu)
3629 goto disconnect;
3630
3631 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
1890d36b
GP		 3632 if (!pi->sdu)
3633 return -ENOMEM;
3634
3635 /* pull sdu_len bytes only after alloc, because of Local Busy
3636 * condition we have to be sure that this will be executed
3637 * only once, i.e., when alloc does not fail */
3638 skb_pull(skb, 2);
18778a63
GP		 3639
3640 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3641
3642 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3643 pi->partial_sdu_len = skb->len;
3644 break;
3645
3646 case L2CAP_SDU_CONTINUE:
3647 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3648 goto disconnect;
3649
3650 if (!pi->sdu)
3651 goto disconnect;
3652
18778a63
GP		 3653 pi->partial_sdu_len += skb->len;
3654 if (pi->partial_sdu_len > pi->sdu_len)
3655 goto drop;
3656
4178ba46
GP		 3657 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3658
18778a63
GP		 3659 break;
3660
3661 case L2CAP_SDU_END:
3662 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3663 goto disconnect;
3664
3665 if (!pi->sdu)
3666 goto disconnect;
3667
1890d36b 3668 if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) {
1890d36b 3669 pi->partial_sdu_len += skb->len;
18778a63 3670
1890d36b
GP		 3671 if (pi->partial_sdu_len > pi->imtu)
3672 goto drop;
18778a63 3673
1890d36b
GP		 3674 if (pi->partial_sdu_len != pi->sdu_len)
3675 goto drop;
4178ba46
GP		 3676
3677 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
1890d36b 3678 }
18778a63
GP		 3679
3680 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
1890d36b
GP		 3681 if (!_skb) {
3682 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3683 return -ENOMEM;
3684 }
3685
18778a63 3686 err = sock_queue_rcv_skb(sk, _skb);
1890d36b 3687 if (err < 0) {
18778a63 3688 kfree_skb(_skb);
1890d36b
GP		 3689 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3690 return err;
3691 }
3692
3693 pi->conn_state &= ~L2CAP_CONN_SAR_RETRY;
3694 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
18778a63
GP		 3695
3696 kfree_skb(pi->sdu);
3697 break;
3698 }
3699
3700 kfree_skb(skb);
1890d36b 3701 return 0;
18778a63
GP		 3702
3703drop:
3704 kfree_skb(pi->sdu);
3705 pi->sdu = NULL;
3706
3707disconnect:
9b108fc0 3708 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
18778a63
GP		 3709 kfree_skb(skb);
3710 return 0;
3711}
3712
712132eb
GP		 3713static int l2cap_try_push_rx_skb(struct sock *sk)
3714{
3715 struct l2cap_pinfo *pi = l2cap_pi(sk);
3716 struct sk_buff *skb;
3717 u16 control;
3718 int err;
3719
3720 while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) {
3721 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3722 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3723 if (err < 0) {
3724 skb_queue_head(BUSY_QUEUE(sk), skb);
3725 return -EBUSY;
3726 }
3727
3728 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3729 }
3730
3731 if (!(pi->conn_state & L2CAP_CONN_RNR_SENT))
3732 goto done;
3733
3734 control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3735 control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
3736 l2cap_send_sframe(pi, control);
3737 l2cap_pi(sk)->retry_count = 1;
3738
3739 del_timer(&pi->retrans_timer);
3740 __mod_monitor_timer();
3741
3742 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
3743
3744done:
3745 pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
3746 pi->conn_state &= ~L2CAP_CONN_RNR_SENT;
3747
3748 BT_DBG("sk %p, Exit local busy", sk);
3749
3750 return 0;
3751}
3752
1890d36b
GP		 3753static void l2cap_busy_work(struct work_struct *work)
3754{
3755 DECLARE_WAITQUEUE(wait, current);
3756 struct l2cap_pinfo *pi =
3757 container_of(work, struct l2cap_pinfo, busy_work);
3758 struct sock *sk = (struct sock *)pi;
3759 int n_tries = 0, timeo = HZ/5, err;
3760 struct sk_buff *skb;
1890d36b
GP		 3761
3762 lock_sock(sk);
3763
2b0b05dd 3764 add_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3765 while ((skb = skb_peek(BUSY_QUEUE(sk)))) {
3766 set_current_state(TASK_INTERRUPTIBLE);
3767
3768 if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
3769 err = -EBUSY;
9b108fc0 3770 l2cap_send_disconn_req(pi->conn, sk, EBUSY);
712132eb 3771 break;
1890d36b
GP		 3772 }
3773
3774 if (!timeo)
3775 timeo = HZ/5;
3776
3777 if (signal_pending(current)) {
3778 err = sock_intr_errno(timeo);
712132eb 3779 break;
1890d36b
GP		 3780 }
3781
3782 release_sock(sk);
3783 timeo = schedule_timeout(timeo);
3784 lock_sock(sk);
3785
3786 err = sock_error(sk);
3787 if (err)
712132eb 3788 break;
1890d36b 3789
712132eb 3790 if (l2cap_try_push_rx_skb(sk) == 0)
1890d36b
GP		 3791 break;
3792 }
3793
1890d36b 3794 set_current_state(TASK_RUNNING);
2b0b05dd 3795 remove_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3796
3797 release_sock(sk);
3798}
3799
3800static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control)
3801{
3802 struct l2cap_pinfo *pi = l2cap_pi(sk);
3803 int sctrl, err;
3804
3805 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3806 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3807 __skb_queue_tail(BUSY_QUEUE(sk), skb);
712132eb
GP		 3808 return l2cap_try_push_rx_skb(sk);
3809
3810
1890d36b
GP		 3811 }
3812
3813 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3814 if (err >= 0) {
3815 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3816 return err;
3817 }
3818
3819 /* Busy Condition */
0e98958d
GP		 3820 BT_DBG("sk %p, Enter local busy", sk);
3821
1890d36b
GP		 3822 pi->conn_state |= L2CAP_CONN_LOCAL_BUSY;
3823 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3824 __skb_queue_tail(BUSY_QUEUE(sk), skb);
3825
3826 sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3827 sctrl |= L2CAP_SUPER_RCV_NOT_READY;
3828 l2cap_send_sframe(pi, sctrl);
3829
3830 pi->conn_state |= L2CAP_CONN_RNR_SENT;
3831
7fe9b298
GP		 3832 del_timer(&pi->ack_timer);
3833
1890d36b
GP		 3834 queue_work(_busy_wq, &pi->busy_work);
3835
3836 return err;
3837}
3838
18778a63 3839static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
c74e560c
GP		 3840{
3841 struct l2cap_pinfo *pi = l2cap_pi(sk);
3842 struct sk_buff *_skb;
3843 int err = -EINVAL;
3844
18778a63
GP		 3845 /*
3846 * TODO: We have to notify the userland if some data is lost with the
3847 * Streaming Mode.
3848 */
3849
c74e560c
GP		 3850 switch (control & L2CAP_CTRL_SAR) {
3851 case L2CAP_SDU_UNSEGMENTED:
3852 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3853 kfree_skb(pi->sdu);
3854 break;
3855 }
3856
3857 err = sock_queue_rcv_skb(sk, skb);
3858 if (!err)
3859 return 0;
3860
3861 break;
3862
3863 case L2CAP_SDU_START:
3864 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3865 kfree_skb(pi->sdu);
3866 break;
3867 }
3868
3869 pi->sdu_len = get_unaligned_le16(skb->data);
3870 skb_pull(skb, 2);
3871
052897ca
GP		 3872 if (pi->sdu_len > pi->imtu) {
3873 err = -EMSGSIZE;
3874 break;
3875 }
3876
c74e560c
GP		 3877 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3878 if (!pi->sdu) {
3879 err = -ENOMEM;
3880 break;
3881 }
3882
3883 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3884
3885 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3886 pi->partial_sdu_len = skb->len;
3887 err = 0;
3888 break;
3889
3890 case L2CAP_SDU_CONTINUE:
3891 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3892 break;
3893
3894 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3895
3896 pi->partial_sdu_len += skb->len;
3897 if (pi->partial_sdu_len > pi->sdu_len)
3898 kfree_skb(pi->sdu);
3899 else
3900 err = 0;
3901
3902 break;
3903
3904 case L2CAP_SDU_END:
3905 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3906 break;
3907
3908 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3909
3910 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3911 pi->partial_sdu_len += skb->len;
3912
36f2fd58
GP		 3913 if (pi->partial_sdu_len > pi->imtu)
3914 goto drop;
3915
c74e560c
GP		 3916 if (pi->partial_sdu_len == pi->sdu_len) {
3917 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3918 err = sock_queue_rcv_skb(sk, _skb);
3919 if (err < 0)
3920 kfree_skb(_skb);
3921 }
c74e560c
GP		 3922 err = 0;
3923
36f2fd58
GP		 3924drop:
3925 kfree_skb(pi->sdu);
c74e560c
GP		 3926 break;
3927 }
3928
3929 kfree_skb(skb);
3930 return err;
3931}
3932
8f17154f
GP		 3933static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3934{
3935 struct sk_buff *skb;
afefdbc4 3936 u16 control;
8f17154f 3937
59203a21 3938 while ((skb = skb_peek(SREJ_QUEUE(sk)))) {
8f17154f
GP		 3939 if (bt_cb(skb)->tx_seq != tx_seq)
3940 break;
3941
3942 skb = skb_dequeue(SREJ_QUEUE(sk));
afefdbc4 3943 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
18778a63 3944 l2cap_ertm_reassembly_sdu(sk, skb, control);
8f17154f
GP		 3945 l2cap_pi(sk)->buffer_seq_srej =
3946 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
8ff50ec0 3947 tx_seq = (tx_seq + 1) % 64;
8f17154f
GP		 3948 }
3949}
3950
3951static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3952{
3953 struct l2cap_pinfo *pi = l2cap_pi(sk);
3954 struct srej_list *l, *tmp;
3955 u16 control;
3956
59203a21 3957 list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
8f17154f
GP		 3958 if (l->tx_seq == tx_seq) {
3959 list_del(&l->list);
3960 kfree(l);
3961 return;
3962 }
3963 control = L2CAP_SUPER_SELECT_REJECT;
3964 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3965 l2cap_send_sframe(pi, control);
3966 list_del(&l->list);
3967 list_add_tail(&l->list, SREJ_LIST(sk));
3968 }
3969}
3970
3971static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3972{
3973 struct l2cap_pinfo *pi = l2cap_pi(sk);
3974 struct srej_list *new;
3975 u16 control;
3976
3977 while (tx_seq != pi->expected_tx_seq) {
3978 control = L2CAP_SUPER_SELECT_REJECT;
3979 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3980 l2cap_send_sframe(pi, control);
3981
3982 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
8ff50ec0
GP		 3983 new->tx_seq = pi->expected_tx_seq;
3984 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3985 list_add_tail(&new->list, SREJ_LIST(sk));
3986 }
8ff50ec0 3987 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3988}
3989
1c2acffb
GP		 3990static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3991{
3992 struct l2cap_pinfo *pi = l2cap_pi(sk);
3993 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3994 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3995 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
f6337c77 3996 int tx_seq_offset, expected_tx_seq_offset;
803020c6 3997 int num_to_ack = (pi->tx_win/6) + 1;
1c2acffb
GP		 3998 int err = 0;
3999
0e98958d
GP		 4000 BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq,
4001 rx_control);
1c2acffb 4002
9b16dc65
GP		 4003 if (L2CAP_CTRL_FINAL & rx_control &&
4004 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
1d8f5d16
GP		 4005 del_timer(&pi->monitor_timer);
4006 if (pi->unacked_frames > 0)
4007 __mod_retrans_timer();
4008 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
4009 }
4010
9f121a5a
GP		 4011 pi->expected_ack_seq = req_seq;
4012 l2cap_drop_acked_frames(sk);
4013
8f17154f
GP		 4014 if (tx_seq == pi->expected_tx_seq)
4015 goto expected;
1c2acffb 4016
9b53350d
JPRV		 4017 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
4018 if (tx_seq_offset < 0)
4019 tx_seq_offset += 64;
4020
4021 /* invalid tx_seq */
4022 if (tx_seq_offset >= pi->tx_win) {
9b108fc0 4023 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
9b53350d
JPRV		 4024 goto drop;
4025 }
4026
1890d36b
GP		 4027 if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY)
4028 goto drop;
4029
8f17154f
GP		 4030 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
4031 struct srej_list *first;
30afb5b2 4032
8f17154f
GP		 4033 first = list_first_entry(SREJ_LIST(sk),
4034 struct srej_list, list);
4035 if (tx_seq == first->tx_seq) {
4036 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
4037 l2cap_check_srej_gap(sk, tx_seq);
4038
4039 list_del(&first->list);
4040 kfree(first);
4041
4042 if (list_empty(SREJ_LIST(sk))) {
4043 pi->buffer_seq = pi->buffer_seq_srej;
4044 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
855666cc 4045 l2cap_send_ack(pi);
0e98958d 4046 BT_DBG("sk %p, Exit SREJ_SENT", sk);
8f17154f
GP		 4047 }
4048 } else {
4049 struct srej_list *l;
9b53350d
JPRV		 4050
4051 /* duplicated tx_seq */
4052 if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
4053 goto drop;
8f17154f
GP		 4054
4055 list_for_each_entry(l, SREJ_LIST(sk), list) {
4056 if (l->tx_seq == tx_seq) {
4057 l2cap_resend_srejframe(sk, tx_seq);
4058 return 0;
4059 }
4060 }
4061 l2cap_send_srejframe(sk, tx_seq);
30afb5b2
GP		 4062 }
4063 } else {
9b53350d
JPRV		 4064 expected_tx_seq_offset =
4065 (pi->expected_tx_seq - pi->buffer_seq) % 64;
4066 if (expected_tx_seq_offset < 0)
4067 expected_tx_seq_offset += 64;
4068
4069 /* duplicated tx_seq */
4070 if (tx_seq_offset < expected_tx_seq_offset)
4071 goto drop;
4072
8f17154f 4073 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 4074
0e98958d
GP		 4075 BT_DBG("sk %p, Enter SREJ", sk);
4076
8f17154f
GP		 4077 INIT_LIST_HEAD(SREJ_LIST(sk));
4078 pi->buffer_seq_srej = pi->buffer_seq;
4079
4080 __skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b 4081 __skb_queue_head_init(BUSY_QUEUE(sk));
8f17154f
GP		 4082 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
4083
ef54fd93
GP		 4084 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
4085
8f17154f 4086 l2cap_send_srejframe(sk, tx_seq);
7fe9b298
GP		 4087
4088 del_timer(&pi->ack_timer);
1c2acffb 4089 }
30afb5b2
GP		 4090 return 0;
4091
8f17154f
GP		 4092expected:
4093 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
4094
4095 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3b1a9f3f
GP		 4096 bt_cb(skb)->tx_seq = tx_seq;
4097 bt_cb(skb)->sar = sar;
4098 __skb_queue_tail(SREJ_QUEUE(sk), skb);
8f17154f
GP		 4099 return 0;
4100 }
4101
2ece3684
GP		 4102 err = l2cap_push_rx_skb(sk, skb, rx_control);
4103 if (err < 0)
4104 return 0;
4105
4ec10d97
GP		 4106 if (rx_control & L2CAP_CTRL_FINAL) {
4107 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4108 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4109 else
4110 l2cap_retransmit_frames(sk);
4ec10d97
GP		 4111 }
4112
c1b4f43b
GP		 4113 __mod_ack_timer();
4114
803020c6
GP		 4115 pi->num_acked = (pi->num_acked + 1) % num_to_ack;
4116 if (pi->num_acked == num_to_ack - 1)
9e917af1
GP		 4117 l2cap_send_ack(pi);
4118
8f17154f 4119 return 0;
9b53350d
JPRV		 4120
4121drop:
4122 kfree_skb(skb);
4123 return 0;
1c2acffb
GP		 4124}
4125
e072745f 4126static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
1c2acffb
GP		 4127{
4128 struct l2cap_pinfo *pi = l2cap_pi(sk);
6e3a5981 4129
0e98958d
GP		 4130 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control),
4131 rx_control);
4132
6e3a5981
GP		 4133 pi->expected_ack_seq = __get_reqseq(rx_control);
4134 l2cap_drop_acked_frames(sk);
1c2acffb 4135
e072745f 4136 if (rx_control & L2CAP_CTRL_POLL) {
3cb123d1 4137 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
05fbd89d
GP		 4138 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
4139 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4140 (pi->unacked_frames > 0))
4141 __mod_retrans_timer();
4142
4143 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4144 l2cap_send_srejtail(sk);
4145 } else {
4146 l2cap_send_i_or_rr_or_rnr(sk);
05fbd89d 4147 }
1d8f5d16 4148
e072745f
GP		 4149 } else if (rx_control & L2CAP_CTRL_FINAL) {
4150 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 4151
e072745f
GP		 4152 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4153 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4154 else
4155 l2cap_retransmit_frames(sk);
2246b2f1 4156
e072745f 4157 } else {
e072745f
GP		 4158 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4159 (pi->unacked_frames > 0))
4160 __mod_retrans_timer();
1c2acffb 4161
2246b2f1 4162 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
dfc909be 4163 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
e072745f 4164 l2cap_send_ack(pi);
dfc909be 4165 } else {
e072745f 4166 l2cap_ertm_send(sk);
dfc909be 4167 }
e072745f
GP		 4168 }
4169}
2246b2f1 4170
e072745f
GP		 4171static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
4172{
4173 struct l2cap_pinfo *pi = l2cap_pi(sk);
4174 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4175
0e98958d
GP		 4176 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4177
e072745f
GP		 4178 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4179
8abb52ee 4180 pi->expected_ack_seq = tx_seq;
e072745f
GP		 4181 l2cap_drop_acked_frames(sk);
4182
4183 if (rx_control & L2CAP_CTRL_FINAL) {
4184 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4185 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4186 else
4187 l2cap_retransmit_frames(sk);
e072745f 4188 } else {
dfc909be 4189 l2cap_retransmit_frames(sk);
30afb5b2 4190
0301ef04 4191 if (pi->conn_state & L2CAP_CONN_WAIT_F)
e072745f 4192 pi->conn_state |= L2CAP_CONN_REJ_ACT;
e072745f
GP		 4193 }
4194}
4195static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
4196{
4197 struct l2cap_pinfo *pi = l2cap_pi(sk);
4198 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4199
0e98958d
GP		 4200 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4201
e072745f 4202 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 4203
e072745f
GP		 4204 if (rx_control & L2CAP_CTRL_POLL) {
4205 pi->expected_ack_seq = tx_seq;
4206 l2cap_drop_acked_frames(sk);
3cb123d1
GP		 4207
4208 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
dfc909be
GP		 4209 l2cap_retransmit_one_frame(sk, tx_seq);
4210
e072745f 4211 l2cap_ertm_send(sk);
dfc909be 4212
e072745f
GP		 4213 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4214 pi->srej_save_reqseq = tx_seq;
4215 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4216 }
e072745f
GP		 4217 } else if (rx_control & L2CAP_CTRL_FINAL) {
4218 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
4219 pi->srej_save_reqseq == tx_seq)
4220 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
4221 else
dfc909be 4222 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f 4223 } else {
dfc909be 4224 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f
GP		 4225 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4226 pi->srej_save_reqseq = tx_seq;
4227 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4228 }
e072745f
GP		 4229 }
4230}
4231
4232static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
4233{
4234 struct l2cap_pinfo *pi = l2cap_pi(sk);
4235 u8 tx_seq = __get_reqseq(rx_control);
4236
0e98958d
GP		 4237 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4238
e072745f
GP		 4239 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
4240 pi->expected_ack_seq = tx_seq;
4241 l2cap_drop_acked_frames(sk);
4242
3cb123d1
GP		 4243 if (rx_control & L2CAP_CTRL_POLL)
4244 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
4245
99b0d4b7
GP		 4246 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
4247 del_timer(&pi->retrans_timer);
a2e12a2a
GP		 4248 if (rx_control & L2CAP_CTRL_POLL)
4249 l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL);
99b0d4b7 4250 return;
e072745f 4251 }
99b0d4b7
GP		 4252
4253 if (rx_control & L2CAP_CTRL_POLL)
4254 l2cap_send_srejtail(sk);
4255 else
4256 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
e072745f
GP		 4257}
4258
4259static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
4260{
4261 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
4262
9b16dc65
GP		 4263 if (L2CAP_CTRL_FINAL & rx_control &&
4264 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
e072745f
GP		 4265 del_timer(&l2cap_pi(sk)->monitor_timer);
4266 if (l2cap_pi(sk)->unacked_frames > 0)
4267 __mod_retrans_timer();
4268 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
4269 }
4270
4271 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
4272 case L2CAP_SUPER_RCV_READY:
4273 l2cap_data_channel_rrframe(sk, rx_control);
8f17154f
GP		 4274 break;
4275
e072745f
GP		 4276 case L2CAP_SUPER_REJECT:
4277 l2cap_data_channel_rejframe(sk, rx_control);
4278 break;
2246b2f1 4279
e072745f
GP		 4280 case L2CAP_SUPER_SELECT_REJECT:
4281 l2cap_data_channel_srejframe(sk, rx_control);
4282 break;
4283
4284 case L2CAP_SUPER_RCV_NOT_READY:
4285 l2cap_data_channel_rnrframe(sk, rx_control);
1c2acffb
GP		 4286 break;
4287 }
4288
faaebd19 4289 kfree_skb(skb);
1c2acffb
GP		 4290 return 0;
4291}
4292
218bb9df
GP		 4293static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
4294{
4295 struct l2cap_pinfo *pi = l2cap_pi(sk);
4296 u16 control;
4297 u8 req_seq;
4298 int len, next_tx_seq_offset, req_seq_offset;
4299
4300 control = get_unaligned_le16(skb->data);
4301 skb_pull(skb, 2);
4302 len = skb->len;
4303
4304 /*
4305 * We can just drop the corrupted I-frame here.
4306 * Receiver will miss it and start proper recovery
4307 * procedures and ask retransmission.
4308 */
4309 if (l2cap_check_fcs(pi, skb))
4310 goto drop;
4311
4312 if (__is_sar_start(control) && __is_iframe(control))
4313 len -= 2;
4314
4315 if (pi->fcs == L2CAP_FCS_CRC16)
4316 len -= 2;
4317
4318 if (len > pi->mps) {
4319 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4320 goto drop;
4321 }
4322
4323 req_seq = __get_reqseq(control);
4324 req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
4325 if (req_seq_offset < 0)
4326 req_seq_offset += 64;
4327
4328 next_tx_seq_offset =
4329 (pi->next_tx_seq - pi->expected_ack_seq) % 64;
4330 if (next_tx_seq_offset < 0)
4331 next_tx_seq_offset += 64;
4332
4333 /* check for invalid req-seq */
4334 if (req_seq_offset > next_tx_seq_offset) {
4335 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4336 goto drop;
4337 }
4338
4339 if (__is_iframe(control)) {
4340 if (len < 0) {
4341 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4342 goto drop;
4343 }
4344
4345 l2cap_data_channel_iframe(sk, control, skb);
4346 } else {
4347 if (len != 0) {
4348 BT_ERR("%d", len);
4349 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
4350 goto drop;
4351 }
4352
4353 l2cap_data_channel_sframe(sk, control, skb);
4354 }
4355
4356 return 0;
4357
4358drop:
4359 kfree_skb(skb);
4360 return 0;
4361}
4362
1da177e4
LT		 4363static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4364{
4365 struct sock *sk;
6840ed07 4366 struct l2cap_pinfo *pi;
51893f88 4367 u16 control;
218bb9df
GP		 4368 u8 tx_seq;
4369 int len;
1da177e4
LT		 4370
4371 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
4372 if (!sk) {
4373 BT_DBG("unknown cid 0x%4.4x", cid);
4374 goto drop;
4375 }
4376
6840ed07
GP		 4377 pi = l2cap_pi(sk);
4378
1da177e4
LT		 4379 BT_DBG("sk %p, len %d", sk, skb->len);
4380
4381 if (sk->sk_state != BT_CONNECTED)
4382 goto drop;
4383
6840ed07 4384 switch (pi->mode) {
1c2acffb
GP		 4385 case L2CAP_MODE_BASIC:
4386 /* If socket recv buffers overflows we drop data here
4387 * which is *bad* because L2CAP has to be reliable.
4388 * But we don't have any other choice. L2CAP doesn't
4389 * provide flow control mechanism. */
1da177e4 4390
6840ed07 4391 if (pi->imtu < skb->len)
1c2acffb 4392 goto drop;
1da177e4 4393
1c2acffb
GP		 4394 if (!sock_queue_rcv_skb(sk, skb))
4395 goto done;
4396 break;
4397
4398 case L2CAP_MODE_ERTM:
218bb9df
GP		 4399 if (!sock_owned_by_user(sk)) {
4400 l2cap_ertm_data_rcv(sk, skb);
277ffbe3 4401 } else {
218bb9df 4402 if (sk_add_backlog(sk, skb))
277ffbe3 4403 goto drop;
277ffbe3 4404 }
1c2acffb 4405
fcafde2e 4406 goto done;
1c2acffb 4407
6840ed07
GP		 4408 case L2CAP_MODE_STREAMING:
4409 control = get_unaligned_le16(skb->data);
4410 skb_pull(skb, 2);
4411 len = skb->len;
4412
26000089
GP		 4413 if (l2cap_check_fcs(pi, skb))
4414 goto drop;
4415
6840ed07
GP		 4416 if (__is_sar_start(control))
4417 len -= 2;
4418
fcc203c3
GP		 4419 if (pi->fcs == L2CAP_FCS_CRC16)
4420 len -= 2;
4421
51893f88 4422 if (len > pi->mps || len < 0 || __is_sframe(control))
6840ed07
GP		 4423 goto drop;
4424
4425 tx_seq = __get_txseq(control);
4426
4427 if (pi->expected_tx_seq == tx_seq)
4428 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
4429 else
7dffe421 4430 pi->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 4431
18778a63 4432 l2cap_streaming_reassembly_sdu(sk, skb, control);
6840ed07
GP		 4433
4434 goto done;
4435
1c2acffb 4436 default:
e8235c6b 4437 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
1c2acffb
GP		 4438 break;
4439 }
1da177e4
LT		 4440
4441drop:
4442 kfree_skb(skb);
4443
4444done:
0139418c
MH		 4445 if (sk)
4446 bh_unlock_sock(sk);
4447
1da177e4
LT		 4448 return 0;
4449}
4450
8e036fc3 4451static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4
LT		 4452{
4453 struct sock *sk;
4454
4455 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
4456 if (!sk)
4457 goto drop;
4458
4459 BT_DBG("sk %p, len %d", sk, skb->len);
4460
4461 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
4462 goto drop;
4463
4464 if (l2cap_pi(sk)->imtu < skb->len)
4465 goto drop;
4466
4467 if (!sock_queue_rcv_skb(sk, skb))
4468 goto done;
4469
4470drop:
4471 kfree_skb(skb);
4472
4473done:
af05b30b
GP		 4474 if (sk)
4475 bh_unlock_sock(sk);
1da177e4
LT		 4476 return 0;
4477}
4478
4479static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4480{
4481 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4482 u16 cid, len;
4483 __le16 psm;
1da177e4
LT		 4484
4485 skb_pull(skb, L2CAP_HDR_SIZE);
4486 cid = __le16_to_cpu(lh->cid);
4487 len = __le16_to_cpu(lh->len);
4488
1c2acffb
GP		 4489 if (len != skb->len) {
4490 kfree_skb(skb);
4491 return;
4492 }
4493
1da177e4
LT		 4494 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4495
4496 switch (cid) {
8db4dc46 4497 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4498 l2cap_sig_channel(conn, skb);
4499 break;
4500
8db4dc46 4501 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4502 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4503 skb_pull(skb, 2);
4504 l2cap_conless_channel(conn, psm, skb);
4505 break;
4506
4507 default:
4508 l2cap_data_channel(conn, cid, skb);
4509 break;
4510 }
4511}
4512
4513/* ---- L2CAP interface with lower layer (HCI) ---- */
4514
4515static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
4516{
4517 int exact = 0, lm1 = 0, lm2 = 0;
4518 register struct sock *sk;
4519 struct hlist_node *node;
4520
4521 if (type != ACL_LINK)
963cf687 4522 return -EINVAL;
1da177e4
LT		 4523
4524 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4525
4526 /* Find listening sockets and check their link_mode */
4527 read_lock(&l2cap_sk_list.lock);
4528 sk_for_each(sk, node, &l2cap_sk_list.head) {
4529 if (sk->sk_state != BT_LISTEN)
4530 continue;
4531
4532 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5
MH		 4533 lm1 |= HCI_LM_ACCEPT;
4534 if (l2cap_pi(sk)->role_switch)
4535 lm1 |= HCI_LM_MASTER;
1da177e4 4536 exact++;
2af6b9d5
MH		 4537 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4538 lm2 |= HCI_LM_ACCEPT;
4539 if (l2cap_pi(sk)->role_switch)
4540 lm2 |= HCI_LM_MASTER;
4541 }
1da177e4
LT		 4542 }
4543 read_unlock(&l2cap_sk_list.lock);
4544
4545 return exact ? lm1 : lm2;
4546}
4547
4548static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
4549{
0139418c
MH		 4550 struct l2cap_conn *conn;
4551
1da177e4
LT		 4552 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4553
4554 if (hcon->type != ACL_LINK)
963cf687 4555 return -EINVAL;
1da177e4
LT		 4556
4557 if (!status) {
1da177e4
LT		 4558 conn = l2cap_conn_add(hcon, status);
4559 if (conn)
4560 l2cap_conn_ready(conn);
0139418c 4561 } else
1da177e4
LT		 4562 l2cap_conn_del(hcon, bt_err(status));
4563
4564 return 0;
4565}
4566
2950f21a
MH		 4567static int l2cap_disconn_ind(struct hci_conn *hcon)
4568{
4569 struct l2cap_conn *conn = hcon->l2cap_data;
4570
4571 BT_DBG("hcon %p", hcon);
4572
4573 if (hcon->type != ACL_LINK || !conn)
4574 return 0x13;
4575
4576 return conn->disc_reason;
4577}
4578
4579static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4580{
4581 BT_DBG("hcon %p reason %d", hcon, reason);
4582
4583 if (hcon->type != ACL_LINK)
963cf687 4584 return -EINVAL;
1da177e4
LT		 4585
4586 l2cap_conn_del(hcon, bt_err(reason));
0139418c 4587
1da177e4
LT		 4588 return 0;
4589}
4590
f62e4323
MH		 4591static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
4592{
bd3c9e25 4593 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
255c7601
MH		 4594 return;
4595
f62e4323
MH		 4596 if (encrypt == 0x00) {
4597 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
4598 l2cap_sock_clear_timer(sk);
4599 l2cap_sock_set_timer(sk, HZ * 5);
4600 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
4601 __l2cap_sock_close(sk, ECONNREFUSED);
4602 } else {
4603 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
4604 l2cap_sock_clear_timer(sk);
4605 }
4606}
4607
8c1b2355 4608static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4
LT		 4609{
4610 struct l2cap_chan_list *l;
0139418c 4611 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 4612 struct sock *sk;
1da177e4 4613
0139418c 4614 if (!conn)
1da177e4 4615 return 0;
0139418c 4616
1da177e4
LT		 4617 l = &conn->chan_list;
4618
4619 BT_DBG("conn %p", conn);
4620
4621 read_lock(&l->lock);
4622
4623 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
4624 bh_lock_sock(sk);
4625
6a8d3010
MH		 4626 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
4627 bh_unlock_sock(sk);
4628 continue;
4629 }
4630
f62e4323 4631 if (!status && (sk->sk_state == BT_CONNECTED ||
8c1b2355 4632 sk->sk_state == BT_CONFIG)) {
f62e4323 4633 l2cap_check_encryption(sk, encrypt);
9719f8af
MH		 4634 bh_unlock_sock(sk);
4635 continue;
4636 }
4637
b1235d79
MH		 4638 if (sk->sk_state == BT_CONNECT) {
4639 if (!status) {
4640 struct l2cap_conn_req req;
4641 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
4642 req.psm = l2cap_pi(sk)->psm;
1da177e4 4643
b1235d79 4644 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
e501d055 4645 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4 4646
b1235d79
MH		 4647 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4648 L2CAP_CONN_REQ, sizeof(req), &req);
4649 } else {
4650 l2cap_sock_clear_timer(sk);
4651 l2cap_sock_set_timer(sk, HZ / 10);
4652 }
4653 } else if (sk->sk_state == BT_CONNECT2) {
4654 struct l2cap_conn_rsp rsp;
4655 __u16 result;
1da177e4 4656
b1235d79
MH		 4657 if (!status) {
4658 sk->sk_state = BT_CONFIG;
4659 result = L2CAP_CR_SUCCESS;
4660 } else {
4661 sk->sk_state = BT_DISCONN;
4662 l2cap_sock_set_timer(sk, HZ / 10);
4663 result = L2CAP_CR_SEC_BLOCK;
4664 }
4665
4666 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
4667 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
4668 rsp.result = cpu_to_le16(result);
e7c29cb1 4669 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
b1235d79
MH		 4670 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4671 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4672 }
1da177e4
LT		 4673
4674 bh_unlock_sock(sk);
4675 }
4676
4677 read_unlock(&l->lock);
b1235d79 4678
1da177e4
LT		 4679 return 0;
4680}
4681
4682static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4683{
4684 struct l2cap_conn *conn = hcon->l2cap_data;
4685
4686 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4687 goto drop;
4688
4689 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4690
4691 if (flags & ACL_START) {
4692 struct l2cap_hdr *hdr;
89794813
AE		 4693 struct sock *sk;
4694 u16 cid;
1da177e4
LT		 4695 int len;
4696
4697 if (conn->rx_len) {
4698 BT_ERR("Unexpected start frame (len %d)", skb->len);
4699 kfree_skb(conn->rx_skb);
4700 conn->rx_skb = NULL;
4701 conn->rx_len = 0;
4702 l2cap_conn_unreliable(conn, ECOMM);
4703 }
4704
aae7fe22
AE		 4705 /* Start fragment always begin with Basic L2CAP header */
4706 if (skb->len < L2CAP_HDR_SIZE) {
1da177e4
LT		 4707 BT_ERR("Frame is too short (len %d)", skb->len);
4708 l2cap_conn_unreliable(conn, ECOMM);
4709 goto drop;
4710 }
4711
4712 hdr = (struct l2cap_hdr *) skb->data;
4713 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
89794813 4714 cid = __le16_to_cpu(hdr->cid);
1da177e4
LT		 4715
4716 if (len == skb->len) {
4717 /* Complete frame received */
4718 l2cap_recv_frame(conn, skb);
4719 return 0;
4720 }
4721
4722 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4723
4724 if (skb->len > len) {
4725 BT_ERR("Frame is too long (len %d, expected len %d)",
4726 skb->len, len);
4727 l2cap_conn_unreliable(conn, ECOMM);
4728 goto drop;
4729 }
4730
89794813
AE		 4731 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
4732
4733 if (sk && l2cap_pi(sk)->imtu < len - L2CAP_HDR_SIZE) {
4734 BT_ERR("Frame exceeding recv MTU (len %d, MTU %d)",
4735 len, l2cap_pi(sk)->imtu);
4736 bh_unlock_sock(sk);
4737 l2cap_conn_unreliable(conn, ECOMM);
4738 goto drop;
4739 }
4740
4741 if (sk)
4742 bh_unlock_sock(sk);
4743
1da177e4 4744 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4745 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4746 if (!conn->rx_skb)
1da177e4
LT		 4747 goto drop;
4748
d626f62b 4749 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4750 skb->len);
1da177e4
LT		 4751 conn->rx_len = len - skb->len;
4752 } else {
4753 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4754
4755 if (!conn->rx_len) {
4756 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4757 l2cap_conn_unreliable(conn, ECOMM);
4758 goto drop;
4759 }
4760
4761 if (skb->len > conn->rx_len) {
4762 BT_ERR("Fragment is too long (len %d, expected %d)",
4763 skb->len, conn->rx_len);
4764 kfree_skb(conn->rx_skb);
4765 conn->rx_skb = NULL;
4766 conn->rx_len = 0;
4767 l2cap_conn_unreliable(conn, ECOMM);
4768 goto drop;
4769 }
4770
d626f62b 4771 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4772 skb->len);
1da177e4
LT		 4773 conn->rx_len -= skb->len;
4774
4775 if (!conn->rx_len) {
4776 /* Complete frame received */
4777 l2cap_recv_frame(conn, conn->rx_skb);
4778 conn->rx_skb = NULL;
4779 }
4780 }
4781
4782drop:
4783 kfree_skb(skb);
4784 return 0;
4785}
4786
aef7d97c 4787static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4
LT		 4788{
4789 struct sock *sk;
4790 struct hlist_node *node;
1da177e4
LT		 4791
4792 read_lock_bh(&l2cap_sk_list.lock);
4793
be9d1227
MH		 4794 sk_for_each(sk, node, &l2cap_sk_list.head) {
4795 struct l2cap_pinfo *pi = l2cap_pi(sk);
101545f6 4796
aef7d97c
MH		 4797 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4798 batostr(&bt_sk(sk)->src),
4799 batostr(&bt_sk(sk)->dst),
4800 sk->sk_state, __le16_to_cpu(pi->psm),
4801 pi->scid, pi->dcid,
4802 pi->imtu, pi->omtu, pi->sec_level);
be9d1227 4803 }
1da177e4 4804
1da177e4 4805 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 4806
aef7d97c 4807 return 0;
1da177e4
LT		 4808}
4809
aef7d97c
MH		 4810static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4811{
4812 return single_open(file, l2cap_debugfs_show, inode->i_private);
4813}
4814
4815static const struct file_operations l2cap_debugfs_fops = {
4816 .open = l2cap_debugfs_open,
4817 .read = seq_read,
4818 .llseek = seq_lseek,
4819 .release = single_release,
4820};
4821
4822static struct dentry *l2cap_debugfs;
1da177e4 4823
90ddc4f0 4824static const struct proto_ops l2cap_sock_ops = {
1da177e4
LT		 4825 .family = PF_BLUETOOTH,
4826 .owner = THIS_MODULE,
4827 .release = l2cap_sock_release,
4828 .bind = l2cap_sock_bind,
4829 .connect = l2cap_sock_connect,
4830 .listen = l2cap_sock_listen,
4831 .accept = l2cap_sock_accept,
4832 .getname = l2cap_sock_getname,
4833 .sendmsg = l2cap_sock_sendmsg,
f66dc81f 4834 .recvmsg = l2cap_sock_recvmsg,
1da177e4 4835 .poll = bt_sock_poll,
3241ad82 4836 .ioctl = bt_sock_ioctl,
1da177e4
LT		 4837 .mmap = sock_no_mmap,
4838 .socketpair = sock_no_socketpair,
1da177e4
LT		 4839 .shutdown = l2cap_sock_shutdown,
4840 .setsockopt = l2cap_sock_setsockopt,
4841 .getsockopt = l2cap_sock_getsockopt
4842};
4843
ec1b4cf7 4844static const struct net_proto_family l2cap_sock_family_ops = {
1da177e4
LT		 4845 .family = PF_BLUETOOTH,
4846 .owner = THIS_MODULE,
4847 .create = l2cap_sock_create,
4848};
4849
4850static struct hci_proto l2cap_hci_proto = {
4851 .name = "L2CAP",
4852 .id = HCI_PROTO_L2CAP,
4853 .connect_ind = l2cap_connect_ind,
4854 .connect_cfm = l2cap_connect_cfm,
4855 .disconn_ind = l2cap_disconn_ind,
2950f21a 4856 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4857 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4858 .recv_acldata = l2cap_recv_acldata
4859};
4860
4861static int __init l2cap_init(void)
4862{
4863 int err;
be9d1227 4864
1da177e4
LT		 4865 err = proto_register(&l2cap_proto, 0);
4866 if (err < 0)
4867 return err;
4868
1890d36b
GP		 4869 _busy_wq = create_singlethread_workqueue("l2cap");
4870 if (!_busy_wq)
4871 goto error;
4872
1da177e4
LT		 4873 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4874 if (err < 0) {
4875 BT_ERR("L2CAP socket registration failed");
4876 goto error;
4877 }
4878
4879 err = hci_register_proto(&l2cap_hci_proto);
4880 if (err < 0) {
4881 BT_ERR("L2CAP protocol registration failed");
4882 bt_sock_unregister(BTPROTO_L2CAP);
4883 goto error;
4884 }
4885
aef7d97c
MH		 4886 if (bt_debugfs) {
4887 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4888 bt_debugfs, NULL, &l2cap_debugfs_fops);
4889 if (!l2cap_debugfs)
4890 BT_ERR("Failed to create L2CAP debug file");
4891 }
1da177e4
LT		 4892
4893 BT_INFO("L2CAP ver %s", VERSION);
4894 BT_INFO("L2CAP socket layer initialized");
4895
4896 return 0;
4897
4898error:
4899 proto_unregister(&l2cap_proto);
4900 return err;
4901}
4902
4903static void __exit l2cap_exit(void)
4904{
aef7d97c 4905 debugfs_remove(l2cap_debugfs);
1da177e4 4906
1890d36b
GP		 4907 flush_workqueue(_busy_wq);
4908 destroy_workqueue(_busy_wq);
4909
1da177e4
LT		 4910 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4911 BT_ERR("L2CAP socket unregistration failed");
4912
4913 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4914 BT_ERR("L2CAP protocol unregistration failed");
4915
4916 proto_unregister(&l2cap_proto);
4917}
4918
4919void l2cap_load(void)
4920{
4921 /* Dummy function to trigger automatic L2CAP module loading by
4922 * other modules that use L2CAP sockets but don't use any other
4923 * symbols from it. */
1da177e4
LT		 4924}
4925EXPORT_SYMBOL(l2cap_load);
4926
4927module_init(l2cap_init);
4928module_exit(l2cap_exit);
4929
d1c4a17d
GP		 4930module_param(disable_ertm, bool, 0644);
4931MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
44dd46de 4932
63fbd24e 4933MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 4934MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4935MODULE_VERSION(VERSION);
4936MODULE_LICENSE("GPL");
4937MODULE_ALIAS("bt-proto-0");
ubuntu-bionic-kernel mirror