projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Bluetooth: Remove check for supported mode
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / l2cap.c
CommitLineData
8e87d142 1/*
1da177e4
LT		 2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142
YH		 15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4
LT		 18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
8e87d142
YH		 20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4
LT		 22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth L2CAP core and sockets. */
26
1da177e4
LT		 27#include <linux/module.h>
28
29#include <linux/types.h>
4fc268d2 30#include <linux/capability.h>
1da177e4
LT		 31#include <linux/errno.h>
32#include <linux/kernel.h>
1da177e4
LT		 33#include <linux/sched.h>
34#include <linux/slab.h>
35#include <linux/poll.h>
36#include <linux/fcntl.h>
37#include <linux/init.h>
38#include <linux/interrupt.h>
39#include <linux/socket.h>
40#include <linux/skbuff.h>
1da177e4 41#include <linux/list.h>
be9d1227 42#include <linux/device.h>
aef7d97c
MH		 43#include <linux/debugfs.h>
44#include <linux/seq_file.h>
af05b30b 45#include <linux/uaccess.h>
fcc203c3 46#include <linux/crc16.h>
1da177e4
LT		 47#include <net/sock.h>
48
49#include <asm/system.h>
1da177e4
LT		 50#include <asm/unaligned.h>
51
52#include <net/bluetooth/bluetooth.h>
53#include <net/bluetooth/hci_core.h>
54#include <net/bluetooth/l2cap.h>
55
44dd46de
MH		 56#define VERSION "2.14"
57
58static int enable_ertm = 0;
f0709e03 59
47ec1dcd 60static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
e1027a7c 61static u8 l2cap_fixed_chan[8] = { 0x02, };
1da177e4 62
90ddc4f0 63static const struct proto_ops l2cap_sock_ops;
1da177e4 64
1890d36b
GP		 65static struct workqueue_struct *_busy_wq;
66
1da177e4 67static struct bt_sock_list l2cap_sk_list = {
d5fb2962 68 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
1da177e4
LT		 69};
70
1890d36b
GP		 71static void l2cap_busy_work(struct work_struct *work);
72
1da177e4
LT		 73static void __l2cap_sock_close(struct sock *sk, int reason);
74static void l2cap_sock_close(struct sock *sk);
75static void l2cap_sock_kill(struct sock *sk);
76
77static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
78 u8 code, u8 ident, u16 dlen, void *data);
79
80/* ---- L2CAP timers ---- */
81static void l2cap_sock_timeout(unsigned long arg)
82{
83 struct sock *sk = (struct sock *) arg;
b1235d79 84 int reason;
1da177e4
LT		 85
86 BT_DBG("sock %p state %d", sk, sk->sk_state);
87
88 bh_lock_sock(sk);
b1235d79 89
f62e4323
MH		 90 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
91 reason = ECONNREFUSED;
92 else if (sk->sk_state == BT_CONNECT &&
2af6b9d5 93 l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
b1235d79
MH		 94 reason = ECONNREFUSED;
95 else
96 reason = ETIMEDOUT;
97
98 __l2cap_sock_close(sk, reason);
99
1da177e4
LT		 100 bh_unlock_sock(sk);
101
102 l2cap_sock_kill(sk);
103 sock_put(sk);
104}
105
106static void l2cap_sock_set_timer(struct sock *sk, long timeout)
107{
108 BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
109 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
110}
111
112static void l2cap_sock_clear_timer(struct sock *sk)
113{
114 BT_DBG("sock %p state %d", sk, sk->sk_state);
115 sk_stop_timer(sk, &sk->sk_timer);
116}
117
0139418c
MH		 118/* ---- L2CAP channels ---- */
119static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
120{
121 struct sock *s;
122 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
123 if (l2cap_pi(s)->dcid == cid)
124 break;
125 }
126 return s;
127}
128
129static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
130{
131 struct sock *s;
132 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
133 if (l2cap_pi(s)->scid == cid)
134 break;
135 }
136 return s;
137}
138
139/* Find channel with given SCID.
140 * Returns locked socket */
141static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
142{
143 struct sock *s;
144 read_lock(&l->lock);
145 s = __l2cap_get_chan_by_scid(l, cid);
af05b30b
GP		 146 if (s)
147 bh_lock_sock(s);
0139418c
MH		 148 read_unlock(&l->lock);
149 return s;
150}
151
152static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
153{
154 struct sock *s;
155 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
156 if (l2cap_pi(s)->ident == ident)
157 break;
158 }
159 return s;
160}
161
162static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
163{
164 struct sock *s;
165 read_lock(&l->lock);
166 s = __l2cap_get_chan_by_ident(l, ident);
af05b30b
GP		 167 if (s)
168 bh_lock_sock(s);
0139418c
MH		 169 read_unlock(&l->lock);
170 return s;
171}
172
173static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
174{
8db4dc46 175 u16 cid = L2CAP_CID_DYN_START;
0139418c 176
8db4dc46 177 for (; cid < L2CAP_CID_DYN_END; cid++) {
af05b30b 178 if (!__l2cap_get_chan_by_scid(l, cid))
0139418c
MH		 179 return cid;
180 }
181
182 return 0;
183}
184
185static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
186{
187 sock_hold(sk);
188
189 if (l->head)
190 l2cap_pi(l->head)->prev_c = sk;
191
192 l2cap_pi(sk)->next_c = l->head;
193 l2cap_pi(sk)->prev_c = NULL;
194 l->head = sk;
195}
196
197static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
198{
199 struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
200
fd1278d7 201 write_lock_bh(&l->lock);
0139418c
MH		 202 if (sk == l->head)
203 l->head = next;
204
205 if (next)
206 l2cap_pi(next)->prev_c = prev;
207 if (prev)
208 l2cap_pi(prev)->next_c = next;
fd1278d7 209 write_unlock_bh(&l->lock);
0139418c
MH		 210
211 __sock_put(sk);
212}
213
214static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
215{
216 struct l2cap_chan_list *l = &conn->chan_list;
217
af05b30b
GP		 218 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
219 l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
0139418c 220
2950f21a
MH		 221 conn->disc_reason = 0x13;
222
0139418c
MH		 223 l2cap_pi(sk)->conn = conn;
224
bd3c9e25 225 if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) {
0139418c
MH		 226 /* Alloc CID for connection-oriented socket */
227 l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
228 } else if (sk->sk_type == SOCK_DGRAM) {
229 /* Connectionless socket */
8db4dc46
GP		 230 l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
231 l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
0139418c
MH		 232 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
233 } else {
234 /* Raw socket can send/recv signalling messages only */
8db4dc46
GP		 235 l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
236 l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
0139418c
MH		 237 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
238 }
239
240 __l2cap_chan_link(l, sk);
241
242 if (parent)
243 bt_accept_enqueue(parent, sk);
244}
245
8e87d142 246/* Delete channel.
0139418c
MH		 247 * Must be called on the locked socket. */
248static void l2cap_chan_del(struct sock *sk, int err)
249{
250 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
251 struct sock *parent = bt_sk(sk)->parent;
252
253 l2cap_sock_clear_timer(sk);
254
255 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
256
8e87d142 257 if (conn) {
0139418c
MH		 258 /* Unlink from channel list */
259 l2cap_chan_unlink(&conn->chan_list, sk);
260 l2cap_pi(sk)->conn = NULL;
261 hci_conn_put(conn->hcon);
262 }
263
b1235d79 264 sk->sk_state = BT_CLOSED;
0139418c
MH		 265 sock_set_flag(sk, SOCK_ZAPPED);
266
267 if (err)
268 sk->sk_err = err;
269
270 if (parent) {
271 bt_accept_unlink(sk);
272 parent->sk_data_ready(parent, 0);
273 } else
274 sk->sk_state_change(sk);
c13ffa62
GP		 275
276 skb_queue_purge(TX_QUEUE(sk));
277
278 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
279 struct srej_list *l, *tmp;
280
281 del_timer(&l2cap_pi(sk)->retrans_timer);
282 del_timer(&l2cap_pi(sk)->monitor_timer);
283 del_timer(&l2cap_pi(sk)->ack_timer);
284
285 skb_queue_purge(SREJ_QUEUE(sk));
286 skb_queue_purge(BUSY_QUEUE(sk));
287
288 list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
289 list_del(&l->list);
290 kfree(l);
291 }
292 }
0139418c
MH		 293}
294
79d554a6 295/* Service level security */
2af6b9d5 296static inline int l2cap_check_security(struct sock *sk)
79d554a6
MH		 297{
298 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
0684e5f9
MH		 299 __u8 auth_type;
300
00ae4af9
MH		 301 if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
302 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
303 auth_type = HCI_AT_NO_BONDING_MITM;
304 else
af05b30b 305 auth_type = HCI_AT_NO_BONDING;
00ae4af9
MH		 306
307 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
308 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
309 } else {
310 switch (l2cap_pi(sk)->sec_level) {
311 case BT_SECURITY_HIGH:
312 auth_type = HCI_AT_GENERAL_BONDING_MITM;
313 break;
314 case BT_SECURITY_MEDIUM:
315 auth_type = HCI_AT_GENERAL_BONDING;
316 break;
317 default:
318 auth_type = HCI_AT_NO_BONDING;
319 break;
320 }
0684e5f9 321 }
79d554a6 322
0684e5f9
MH		 323 return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
324 auth_type);
79d554a6
MH		 325}
326
4e8402a3
MH		 327static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
328{
329 u8 id;
330
331 /* Get next available identificator.
332 * 1 - 128 are used by kernel.
333 * 129 - 199 are reserved.
334 * 200 - 254 are used by utilities like l2ping, etc.
335 */
336
337 spin_lock_bh(&conn->lock);
338
339 if (++conn->tx_ident > 128)
340 conn->tx_ident = 1;
341
342 id = conn->tx_ident;
343
344 spin_unlock_bh(&conn->lock);
345
346 return id;
347}
348
9a9c6a34 349static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
4e8402a3
MH		 350{
351 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
352
353 BT_DBG("code 0x%2.2x", code);
354
355 if (!skb)
9a9c6a34 356 return;
4e8402a3 357
9a9c6a34 358 hci_send_acl(conn->hcon, skb, 0);
4e8402a3
MH		 359}
360
9a9c6a34 361static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
1c2acffb
GP		 362{
363 struct sk_buff *skb;
364 struct l2cap_hdr *lh;
365 struct l2cap_conn *conn = pi->conn;
c13ffa62 366 struct sock *sk = (struct sock *)pi;
fcc203c3
GP		 367 int count, hlen = L2CAP_HDR_SIZE + 2;
368
c13ffa62
GP		 369 if (sk->sk_state != BT_CONNECTED)
370 return;
371
fcc203c3
GP		 372 if (pi->fcs == L2CAP_FCS_CRC16)
373 hlen += 2;
1c2acffb
GP		 374
375 BT_DBG("pi %p, control 0x%2.2x", pi, control);
376
fcc203c3 377 count = min_t(unsigned int, conn->mtu, hlen);
1c2acffb
GP		 378 control |= L2CAP_CTRL_FRAME_TYPE;
379
9e917af1
GP		 380 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
381 control |= L2CAP_CTRL_FINAL;
382 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
383 }
384
f0946ccf
GP		 385 if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
386 control |= L2CAP_CTRL_POLL;
387 pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
388 }
389
1c2acffb
GP		 390 skb = bt_skb_alloc(count, GFP_ATOMIC);
391 if (!skb)
9a9c6a34 392 return;
1c2acffb
GP		 393
394 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fcc203c3 395 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1c2acffb
GP		 396 lh->cid = cpu_to_le16(pi->dcid);
397 put_unaligned_le16(control, skb_put(skb, 2));
398
fcc203c3
GP		 399 if (pi->fcs == L2CAP_FCS_CRC16) {
400 u16 fcs = crc16(0, (u8 *)lh, count - 2);
401 put_unaligned_le16(fcs, skb_put(skb, 2));
402 }
403
9a9c6a34 404 hci_send_acl(pi->conn->hcon, skb, 0);
1c2acffb
GP		 405}
406
9a9c6a34 407static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
7e743090 408{
1890d36b 409 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
7e743090 410 control |= L2CAP_SUPER_RCV_NOT_READY;
1890d36b
GP		 411 pi->conn_state |= L2CAP_CONN_RNR_SENT;
412 } else
7e743090
GP		 413 control |= L2CAP_SUPER_RCV_READY;
414
2ab25cdd
GP		 415 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
416
9a9c6a34 417 l2cap_send_sframe(pi, control);
7e743090
GP		 418}
419
e501d055
AE		 420static inline int __l2cap_no_conn_pending(struct sock *sk)
421{
422 return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND);
423}
424
79d554a6
MH		 425static void l2cap_do_start(struct sock *sk)
426{
427 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
428
429 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 430 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
431 return;
432
e501d055 433 if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) {
b1235d79
MH		 434 struct l2cap_conn_req req;
435 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
436 req.psm = l2cap_pi(sk)->psm;
79d554a6 437
b1235d79 438 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
e501d055 439 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
79d554a6 440
b1235d79 441 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
79d554a6 442 L2CAP_CONN_REQ, sizeof(req), &req);
b1235d79 443 }
79d554a6
MH		 444 } else {
445 struct l2cap_info_req req;
446 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
447
448 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
449 conn->info_ident = l2cap_get_ident(conn);
450
451 mod_timer(&conn->info_timer, jiffies +
452 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
453
454 l2cap_send_cmd(conn, conn->info_ident,
455 L2CAP_INFO_REQ, sizeof(req), &req);
456 }
457}
458
9b108fc0 459static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err)
22121fc9
GP		 460{
461 struct l2cap_disconn_req req;
462
c13ffa62
GP		 463 if (!conn)
464 return;
465
466 skb_queue_purge(TX_QUEUE(sk));
467
468 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
469 del_timer(&l2cap_pi(sk)->retrans_timer);
470 del_timer(&l2cap_pi(sk)->monitor_timer);
471 del_timer(&l2cap_pi(sk)->ack_timer);
472 }
473
22121fc9
GP		 474 req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
475 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
476 l2cap_send_cmd(conn, l2cap_get_ident(conn),
477 L2CAP_DISCONN_REQ, sizeof(req), &req);
c13ffa62
GP		 478
479 sk->sk_state = BT_DISCONN;
9b108fc0 480 sk->sk_err = err;
22121fc9
GP		 481}
482
1da177e4 483/* ---- L2CAP connections ---- */
4e8402a3
MH		 484static void l2cap_conn_start(struct l2cap_conn *conn)
485{
486 struct l2cap_chan_list *l = &conn->chan_list;
487 struct sock *sk;
488
489 BT_DBG("conn %p", conn);
490
491 read_lock(&l->lock);
492
493 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
494 bh_lock_sock(sk);
495
bd3c9e25
GP		 496 if (sk->sk_type != SOCK_SEQPACKET &&
497 sk->sk_type != SOCK_STREAM) {
79d554a6
MH		 498 bh_unlock_sock(sk);
499 continue;
500 }
501
502 if (sk->sk_state == BT_CONNECT) {
e501d055
AE		 503 if (l2cap_check_security(sk) &&
504 __l2cap_no_conn_pending(sk)) {
b1235d79
MH		 505 struct l2cap_conn_req req;
506 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
507 req.psm = l2cap_pi(sk)->psm;
79d554a6 508
b1235d79 509 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
e501d055 510 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
79d554a6 511
b1235d79 512 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4e8402a3 513 L2CAP_CONN_REQ, sizeof(req), &req);
b1235d79 514 }
79d554a6
MH		 515 } else if (sk->sk_state == BT_CONNECT2) {
516 struct l2cap_conn_rsp rsp;
517 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
518 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
519
2af6b9d5 520 if (l2cap_check_security(sk)) {
f66dc81f
MH		 521 if (bt_sk(sk)->defer_setup) {
522 struct sock *parent = bt_sk(sk)->parent;
523 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
524 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
525 parent->sk_data_ready(parent, 0);
526
527 } else {
528 sk->sk_state = BT_CONFIG;
529 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
530 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
531 }
79d554a6
MH		 532 } else {
533 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
534 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
535 }
536
537 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
538 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4e8402a3
MH		 539 }
540
541 bh_unlock_sock(sk);
542 }
543
544 read_unlock(&l->lock);
545}
546
547static void l2cap_conn_ready(struct l2cap_conn *conn)
548{
79d554a6
MH		 549 struct l2cap_chan_list *l = &conn->chan_list;
550 struct sock *sk;
4e8402a3 551
79d554a6 552 BT_DBG("conn %p", conn);
4e8402a3 553
79d554a6 554 read_lock(&l->lock);
4e8402a3 555
79d554a6
MH		 556 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
557 bh_lock_sock(sk);
4e8402a3 558
bd3c9e25
GP		 559 if (sk->sk_type != SOCK_SEQPACKET &&
560 sk->sk_type != SOCK_STREAM) {
79d554a6
MH		 561 l2cap_sock_clear_timer(sk);
562 sk->sk_state = BT_CONNECTED;
563 sk->sk_state_change(sk);
564 } else if (sk->sk_state == BT_CONNECT)
565 l2cap_do_start(sk);
4e8402a3 566
79d554a6 567 bh_unlock_sock(sk);
4e8402a3 568 }
79d554a6
MH		 569
570 read_unlock(&l->lock);
4e8402a3
MH		 571}
572
573/* Notify sockets that we cannot guaranty reliability anymore */
574static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
575{
576 struct l2cap_chan_list *l = &conn->chan_list;
577 struct sock *sk;
578
579 BT_DBG("conn %p", conn);
580
581 read_lock(&l->lock);
582
583 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2af6b9d5 584 if (l2cap_pi(sk)->force_reliable)
4e8402a3
MH		 585 sk->sk_err = err;
586 }
587
588 read_unlock(&l->lock);
589}
590
591static void l2cap_info_timeout(unsigned long arg)
592{
593 struct l2cap_conn *conn = (void *) arg;
594
984947dc 595 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 596 conn->info_ident = 0;
984947dc 597
4e8402a3
MH		 598 l2cap_conn_start(conn);
599}
600
1da177e4
LT		 601static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
602{
0139418c 603 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 604
0139418c 605 if (conn || status)
1da177e4
LT		 606 return conn;
607
0139418c
MH		 608 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
609 if (!conn)
1da177e4 610 return NULL;
1da177e4
LT		 611
612 hcon->l2cap_data = conn;
613 conn->hcon = hcon;
614
0139418c
MH		 615 BT_DBG("hcon %p conn %p", hcon, conn);
616
1da177e4
LT		 617 conn->mtu = hcon->hdev->acl_mtu;
618 conn->src = &hcon->hdev->bdaddr;
619 conn->dst = &hcon->dst;
620
4e8402a3
MH		 621 conn->feat_mask = 0;
622
1da177e4
LT		 623 spin_lock_init(&conn->lock);
624 rwlock_init(&conn->chan_list.lock);
625
45054dc1
DY		 626 setup_timer(&conn->info_timer, l2cap_info_timeout,
627 (unsigned long) conn);
628
2950f21a
MH		 629 conn->disc_reason = 0x13;
630
1da177e4
LT		 631 return conn;
632}
633
0139418c 634static void l2cap_conn_del(struct hci_conn *hcon, int err)
1da177e4 635{
0139418c 636 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4
LT		 637 struct sock *sk;
638
0139418c
MH		 639 if (!conn)
640 return;
1da177e4
LT		 641
642 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
643
7585b97a 644 kfree_skb(conn->rx_skb);
1da177e4
LT		 645
646 /* Kill channels */
647 while ((sk = conn->chan_list.head)) {
648 bh_lock_sock(sk);
649 l2cap_chan_del(sk, err);
650 bh_unlock_sock(sk);
651 l2cap_sock_kill(sk);
652 }
653
8e8440f5
DY		 654 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
655 del_timer_sync(&conn->info_timer);
3ab22731 656
1da177e4
LT		 657 hcon->l2cap_data = NULL;
658 kfree(conn);
1da177e4
LT		 659}
660
661static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
662{
663 struct l2cap_chan_list *l = &conn->chan_list;
fd1278d7 664 write_lock_bh(&l->lock);
1da177e4 665 __l2cap_chan_add(conn, sk, parent);
fd1278d7 666 write_unlock_bh(&l->lock);
1da177e4
LT		 667}
668
1da177e4 669/* ---- Socket interface ---- */
8e036fc3 670static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
1da177e4
LT		 671{
672 struct sock *sk;
673 struct hlist_node *node;
674 sk_for_each(sk, node, &l2cap_sk_list.head)
675 if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
676 goto found;
677 sk = NULL;
678found:
679 return sk;
680}
681
682/* Find socket with psm and source bdaddr.
683 * Returns closest match.
684 */
8e036fc3 685static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4
LT		 686{
687 struct sock *sk = NULL, *sk1 = NULL;
688 struct hlist_node *node;
689
690 sk_for_each(sk, node, &l2cap_sk_list.head) {
691 if (state && sk->sk_state != state)
692 continue;
693
694 if (l2cap_pi(sk)->psm == psm) {
695 /* Exact match. */
696 if (!bacmp(&bt_sk(sk)->src, src))
697 break;
698
699 /* Closest match */
700 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
701 sk1 = sk;
702 }
703 }
704 return node ? sk : sk1;
705}
706
707/* Find socket with given address (psm, src).
708 * Returns locked socket */
8e036fc3 709static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4
LT		 710{
711 struct sock *s;
712 read_lock(&l2cap_sk_list.lock);
713 s = __l2cap_get_sock_by_psm(state, psm, src);
af05b30b
GP		 714 if (s)
715 bh_lock_sock(s);
1da177e4
LT		 716 read_unlock(&l2cap_sk_list.lock);
717 return s;
718}
719
720static void l2cap_sock_destruct(struct sock *sk)
721{
722 BT_DBG("sk %p", sk);
723
724 skb_queue_purge(&sk->sk_receive_queue);
725 skb_queue_purge(&sk->sk_write_queue);
726}
727
728static void l2cap_sock_cleanup_listen(struct sock *parent)
729{
730 struct sock *sk;
731
732 BT_DBG("parent %p", parent);
733
734 /* Close not yet accepted channels */
735 while ((sk = bt_accept_dequeue(parent, NULL)))
736 l2cap_sock_close(sk);
737
b1235d79 738 parent->sk_state = BT_CLOSED;
1da177e4
LT		 739 sock_set_flag(parent, SOCK_ZAPPED);
740}
741
742/* Kill socket (only if zapped and orphan)
743 * Must be called on unlocked socket.
744 */
745static void l2cap_sock_kill(struct sock *sk)
746{
747 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
748 return;
749
750 BT_DBG("sk %p state %d", sk, sk->sk_state);
751
752 /* Kill poor orphan */
753 bt_sock_unlink(&l2cap_sk_list, sk);
754 sock_set_flag(sk, SOCK_DEAD);
755 sock_put(sk);
756}
757
758static void __l2cap_sock_close(struct sock *sk, int reason)
759{
760 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
761
762 switch (sk->sk_state) {
763 case BT_LISTEN:
764 l2cap_sock_cleanup_listen(sk);
765 break;
766
767 case BT_CONNECTED:
768 case BT_CONFIG:
bd3c9e25
GP		 769 if (sk->sk_type == SOCK_SEQPACKET ||
770 sk->sk_type == SOCK_STREAM) {
1da177e4 771 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1da177e4 772
1da177e4 773 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
9b108fc0 774 l2cap_send_disconn_req(conn, sk, reason);
b1235d79 775 } else
1da177e4 776 l2cap_chan_del(sk, reason);
1da177e4
LT		 777 break;
778
f66dc81f 779 case BT_CONNECT2:
bd3c9e25
GP		 780 if (sk->sk_type == SOCK_SEQPACKET ||
781 sk->sk_type == SOCK_STREAM) {
f66dc81f
MH		 782 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
783 struct l2cap_conn_rsp rsp;
784 __u16 result;
785
786 if (bt_sk(sk)->defer_setup)
787 result = L2CAP_CR_SEC_BLOCK;
788 else
789 result = L2CAP_CR_BAD_PSM;
790
791 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
792 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
793 rsp.result = cpu_to_le16(result);
794 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
795 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
796 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
797 } else
798 l2cap_chan_del(sk, reason);
799 break;
800
1da177e4
LT		 801 case BT_CONNECT:
802 case BT_DISCONN:
803 l2cap_chan_del(sk, reason);
804 break;
805
806 default:
807 sock_set_flag(sk, SOCK_ZAPPED);
808 break;
809 }
810}
811
812/* Must be called on unlocked socket. */
813static void l2cap_sock_close(struct sock *sk)
814{
815 l2cap_sock_clear_timer(sk);
816 lock_sock(sk);
817 __l2cap_sock_close(sk, ECONNRESET);
818 release_sock(sk);
819 l2cap_sock_kill(sk);
820}
821
822static void l2cap_sock_init(struct sock *sk, struct sock *parent)
823{
824 struct l2cap_pinfo *pi = l2cap_pi(sk);
825
826 BT_DBG("sk %p", sk);
827
828 if (parent) {
829 sk->sk_type = parent->sk_type;
f66dc81f
MH		 830 bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
831
1da177e4
LT		 832 pi->imtu = l2cap_pi(parent)->imtu;
833 pi->omtu = l2cap_pi(parent)->omtu;
85eb53c6 834 pi->conf_state = l2cap_pi(parent)->conf_state;
c6b03cf9
MH		 835 pi->mode = l2cap_pi(parent)->mode;
836 pi->fcs = l2cap_pi(parent)->fcs;
68d7f0ce 837 pi->max_tx = l2cap_pi(parent)->max_tx;
14b5aa71 838 pi->tx_win = l2cap_pi(parent)->tx_win;
2af6b9d5
MH		 839 pi->sec_level = l2cap_pi(parent)->sec_level;
840 pi->role_switch = l2cap_pi(parent)->role_switch;
841 pi->force_reliable = l2cap_pi(parent)->force_reliable;
1da177e4
LT		 842 } else {
843 pi->imtu = L2CAP_DEFAULT_MTU;
844 pi->omtu = 0;
85eb53c6 845 if (enable_ertm && sk->sk_type == SOCK_STREAM) {
bd3c9e25 846 pi->mode = L2CAP_MODE_ERTM;
85eb53c6
GP		 847 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
848 } else {
bd3c9e25 849 pi->mode = L2CAP_MODE_BASIC;
85eb53c6 850 }
fd059b9b 851 pi->max_tx = L2CAP_DEFAULT_MAX_TX;
c6b03cf9 852 pi->fcs = L2CAP_FCS_CRC16;
fd059b9b 853 pi->tx_win = L2CAP_DEFAULT_TX_WINDOW;
2af6b9d5
MH		 854 pi->sec_level = BT_SECURITY_LOW;
855 pi->role_switch = 0;
856 pi->force_reliable = 0;
1da177e4
LT		 857 }
858
859 /* Default config options */
5dee9e7c 860 pi->conf_len = 0;
1da177e4 861 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
45054dc1
DY		 862 skb_queue_head_init(TX_QUEUE(sk));
863 skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b 864 skb_queue_head_init(BUSY_QUEUE(sk));
45054dc1 865 INIT_LIST_HEAD(SREJ_LIST(sk));
1da177e4
LT		 866}
867
868static struct proto l2cap_proto = {
869 .name = "L2CAP",
870 .owner = THIS_MODULE,
871 .obj_size = sizeof(struct l2cap_pinfo)
872};
873
1b8d7ae4 874static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
1da177e4
LT		 875{
876 struct sock *sk;
877
6257ff21 878 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
1da177e4
LT		 879 if (!sk)
880 return NULL;
881
882 sock_init_data(sock, sk);
883 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
884
885 sk->sk_destruct = l2cap_sock_destruct;
4e8402a3 886 sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
1da177e4
LT		 887
888 sock_reset_flag(sk, SOCK_ZAPPED);
889
890 sk->sk_protocol = proto;
b1235d79 891 sk->sk_state = BT_OPEN;
1da177e4 892
b1235d79 893 setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
1da177e4
LT		 894
895 bt_sock_link(&l2cap_sk_list, sk);
896 return sk;
897}
898
3f378b68
EP		 899static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
900 int kern)
1da177e4
LT		 901{
902 struct sock *sk;
903
904 BT_DBG("sock %p", sock);
905
906 sock->state = SS_UNCONNECTED;
907
bd3c9e25 908 if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM &&
1da177e4
LT		 909 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
910 return -ESOCKTNOSUPPORT;
911
c84b3268 912 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1da177e4
LT		 913 return -EPERM;
914
915 sock->ops = &l2cap_sock_ops;
916
1b8d7ae4 917 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1da177e4
LT		 918 if (!sk)
919 return -ENOMEM;
920
921 l2cap_sock_init(sk, NULL);
922 return 0;
923}
924
f29972de 925static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
1da177e4 926{
1da177e4 927 struct sock *sk = sock->sk;
f29972de
MH		 928 struct sockaddr_l2 la;
929 int len, err = 0;
1da177e4 930
f29972de 931 BT_DBG("sk %p", sk);
1da177e4
LT		 932
933 if (!addr || addr->sa_family != AF_BLUETOOTH)
934 return -EINVAL;
935
f29972de
MH		 936 memset(&la, 0, sizeof(la));
937 len = min_t(unsigned int, sizeof(la), alen);
938 memcpy(&la, addr, len);
939
2a517ca6
MH		 940 if (la.l2_cid)
941 return -EINVAL;
942
1da177e4
LT		 943 lock_sock(sk);
944
945 if (sk->sk_state != BT_OPEN) {
946 err = -EBADFD;
947 goto done;
948 }
949
b4324b5d 950 if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 &&
847641d7
MH		 951 !capable(CAP_NET_BIND_SERVICE)) {
952 err = -EACCES;
953 goto done;
954 }
8e87d142 955
1da177e4
LT		 956 write_lock_bh(&l2cap_sk_list.lock);
957
f29972de 958 if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
1da177e4
LT		 959 err = -EADDRINUSE;
960 } else {
961 /* Save source address */
f29972de
MH		 962 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
963 l2cap_pi(sk)->psm = la.l2_psm;
964 l2cap_pi(sk)->sport = la.l2_psm;
1da177e4 965 sk->sk_state = BT_BOUND;
2af6b9d5 966
b4324b5d
MH		 967 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
968 __le16_to_cpu(la.l2_psm) == 0x0003)
2af6b9d5 969 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
1da177e4
LT		 970 }
971
972 write_unlock_bh(&l2cap_sk_list.lock);
973
974done:
975 release_sock(sk);
976 return err;
977}
978
979static int l2cap_do_connect(struct sock *sk)
980{
981 bdaddr_t *src = &bt_sk(sk)->src;
982 bdaddr_t *dst = &bt_sk(sk)->dst;
983 struct l2cap_conn *conn;
984 struct hci_conn *hcon;
985 struct hci_dev *hdev;
09ab6f4c 986 __u8 auth_type;
44d0e48e 987 int err;
1da177e4 988
f29972de
MH		 989 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
990 l2cap_pi(sk)->psm);
1da177e4 991
af05b30b
GP		 992 hdev = hci_get_route(dst, src);
993 if (!hdev)
1da177e4
LT		 994 return -EHOSTUNREACH;
995
996 hci_dev_lock_bh(hdev);
997
998 err = -ENOMEM;
999
8c1b2355 1000 if (sk->sk_type == SOCK_RAW) {
2af6b9d5
MH		 1001 switch (l2cap_pi(sk)->sec_level) {
1002 case BT_SECURITY_HIGH:
8c1b2355 1003 auth_type = HCI_AT_DEDICATED_BONDING_MITM;
2af6b9d5
MH		 1004 break;
1005 case BT_SECURITY_MEDIUM:
8c1b2355 1006 auth_type = HCI_AT_DEDICATED_BONDING;
2af6b9d5
MH		 1007 break;
1008 default:
09ab6f4c 1009 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 1010 break;
1011 }
8c1b2355 1012 } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
2af6b9d5 1013 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
8c1b2355 1014 auth_type = HCI_AT_NO_BONDING_MITM;
09ab6f4c 1015 else
8c1b2355 1016 auth_type = HCI_AT_NO_BONDING;
435fef20
MH		 1017
1018 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
1019 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
8c1b2355 1020 } else {
2af6b9d5
MH		 1021 switch (l2cap_pi(sk)->sec_level) {
1022 case BT_SECURITY_HIGH:
8c1b2355 1023 auth_type = HCI_AT_GENERAL_BONDING_MITM;
2af6b9d5
MH		 1024 break;
1025 case BT_SECURITY_MEDIUM:
09ab6f4c 1026 auth_type = HCI_AT_GENERAL_BONDING;
2af6b9d5
MH		 1027 break;
1028 default:
8c1b2355 1029 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 1030 break;
1031 }
09ab6f4c
MH		 1032 }
1033
2af6b9d5
MH		 1034 hcon = hci_connect(hdev, ACL_LINK, dst,
1035 l2cap_pi(sk)->sec_level, auth_type);
1da177e4
LT		 1036 if (!hcon)
1037 goto done;
1038
1039 conn = l2cap_conn_add(hcon, 0);
1040 if (!conn) {
1041 hci_conn_put(hcon);
1042 goto done;
1043 }
1044
1045 err = 0;
1046
1047 /* Update source addr of the socket */
1048 bacpy(src, conn->src);
1049
1050 l2cap_chan_add(conn, sk, NULL);
1051
1052 sk->sk_state = BT_CONNECT;
1053 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
1054
1055 if (hcon->state == BT_CONNECTED) {
bd3c9e25
GP		 1056 if (sk->sk_type != SOCK_SEQPACKET &&
1057 sk->sk_type != SOCK_STREAM) {
1da177e4
LT		 1058 l2cap_sock_clear_timer(sk);
1059 sk->sk_state = BT_CONNECTED;
79d554a6
MH		 1060 } else
1061 l2cap_do_start(sk);
1da177e4
LT		 1062 }
1063
1064done:
1065 hci_dev_unlock_bh(hdev);
1066 hci_dev_put(hdev);
1067 return err;
1068}
1069
1070static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
1071{
1da177e4 1072 struct sock *sk = sock->sk;
f29972de
MH		 1073 struct sockaddr_l2 la;
1074 int len, err = 0;
1da177e4 1075
1da177e4
LT		 1076 BT_DBG("sk %p", sk);
1077
6503d961
CG		 1078 if (!addr || alen < sizeof(addr->sa_family) ||
1079 addr->sa_family != AF_BLUETOOTH)
2a517ca6 1080 return -EINVAL;
1da177e4 1081
f29972de
MH		 1082 memset(&la, 0, sizeof(la));
1083 len = min_t(unsigned int, sizeof(la), alen);
1084 memcpy(&la, addr, len);
1085
2a517ca6
MH		 1086 if (la.l2_cid)
1087 return -EINVAL;
1088
1089 lock_sock(sk);
1090
bd3c9e25
GP		 1091 if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM)
1092 && !la.l2_psm) {
1da177e4
LT		 1093 err = -EINVAL;
1094 goto done;
1095 }
1096
c6b03cf9
MH		 1097 switch (l2cap_pi(sk)->mode) {
1098 case L2CAP_MODE_BASIC:
1099 break;
1100 case L2CAP_MODE_ERTM:
f2fcfcd6 1101 case L2CAP_MODE_STREAMING:
c6b03cf9
MH		 1102 if (enable_ertm)
1103 break;
1104 /* fall through */
1105 default:
1106 err = -ENOTSUPP;
1107 goto done;
1108 }
1109
af05b30b 1110 switch (sk->sk_state) {
1da177e4
LT		 1111 case BT_CONNECT:
1112 case BT_CONNECT2:
1113 case BT_CONFIG:
1114 /* Already connecting */
1115 goto wait;
1116
1117 case BT_CONNECTED:
1118 /* Already connected */
1119 goto done;
1120
1121 case BT_OPEN:
1122 case BT_BOUND:
1123 /* Can connect */
1124 break;
1125
1126 default:
1127 err = -EBADFD;
1128 goto done;
1129 }
1130
1131 /* Set destination address and psm */
f29972de
MH		 1132 bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
1133 l2cap_pi(sk)->psm = la.l2_psm;
1da177e4 1134
af05b30b
GP		 1135 err = l2cap_do_connect(sk);
1136 if (err)
1da177e4
LT		 1137 goto done;
1138
1139wait:
1140 err = bt_sock_wait_state(sk, BT_CONNECTED,
1141 sock_sndtimeo(sk, flags & O_NONBLOCK));
1142done:
1143 release_sock(sk);
1144 return err;
1145}
1146
1147static int l2cap_sock_listen(struct socket *sock, int backlog)
1148{
1149 struct sock *sk = sock->sk;
1150 int err = 0;
1151
1152 BT_DBG("sk %p backlog %d", sk, backlog);
1153
1154 lock_sock(sk);
1155
bd3c9e25
GP		 1156 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM)
1157 || sk->sk_state != BT_BOUND) {
1da177e4
LT		 1158 err = -EBADFD;
1159 goto done;
1160 }
1161
c6b03cf9
MH		 1162 switch (l2cap_pi(sk)->mode) {
1163 case L2CAP_MODE_BASIC:
1164 break;
1165 case L2CAP_MODE_ERTM:
f2fcfcd6 1166 case L2CAP_MODE_STREAMING:
c6b03cf9
MH		 1167 if (enable_ertm)
1168 break;
1169 /* fall through */
1170 default:
1171 err = -ENOTSUPP;
1172 goto done;
1173 }
1174
1da177e4
LT		 1175 if (!l2cap_pi(sk)->psm) {
1176 bdaddr_t *src = &bt_sk(sk)->src;
1177 u16 psm;
1178
1179 err = -EINVAL;
1180
1181 write_lock_bh(&l2cap_sk_list.lock);
1182
1183 for (psm = 0x1001; psm < 0x1100; psm += 2)
b4324b5d
MH		 1184 if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
1185 l2cap_pi(sk)->psm = cpu_to_le16(psm);
1186 l2cap_pi(sk)->sport = cpu_to_le16(psm);
1da177e4
LT		 1187 err = 0;
1188 break;
1189 }
1190
1191 write_unlock_bh(&l2cap_sk_list.lock);
1192
1193 if (err < 0)
1194 goto done;
1195 }
1196
1197 sk->sk_max_ack_backlog = backlog;
1198 sk->sk_ack_backlog = 0;
1199 sk->sk_state = BT_LISTEN;
1200
1201done:
1202 release_sock(sk);
1203 return err;
1204}
1205
1206static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
1207{
1208 DECLARE_WAITQUEUE(wait, current);
1209 struct sock *sk = sock->sk, *nsk;
1210 long timeo;
1211 int err = 0;
1212
fcc70d5f 1213 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1214
1215 if (sk->sk_state != BT_LISTEN) {
1216 err = -EBADFD;
1217 goto done;
1218 }
1219
1220 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1221
1222 BT_DBG("sk %p timeo %ld", sk, timeo);
1223
1224 /* Wait for an incoming connection. (wake-one). */
aa395145 1225 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 1226 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
1227 set_current_state(TASK_INTERRUPTIBLE);
1228 if (!timeo) {
1229 err = -EAGAIN;
1230 break;
1231 }
1232
1233 release_sock(sk);
1234 timeo = schedule_timeout(timeo);
fcc70d5f 1235 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1236
1237 if (sk->sk_state != BT_LISTEN) {
1238 err = -EBADFD;
1239 break;
1240 }
1241
1242 if (signal_pending(current)) {
1243 err = sock_intr_errno(timeo);
1244 break;
1245 }
1246 }
1247 set_current_state(TASK_RUNNING);
aa395145 1248 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 1249
1250 if (err)
1251 goto done;
1252
1253 newsock->state = SS_CONNECTED;
1254
1255 BT_DBG("new socket %p", nsk);
1256
1257done:
1258 release_sock(sk);
1259 return err;
1260}
1261
1262static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
1263{
1264 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
1265 struct sock *sk = sock->sk;
1266
1267 BT_DBG("sock %p, sk %p", sock, sk);
1268
1269 addr->sa_family = AF_BLUETOOTH;
1270 *len = sizeof(struct sockaddr_l2);
1271
f29972de
MH		 1272 if (peer) {
1273 la->l2_psm = l2cap_pi(sk)->psm;
1da177e4 1274 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
b4324b5d 1275 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
f29972de
MH		 1276 } else {
1277 la->l2_psm = l2cap_pi(sk)->sport;
1da177e4 1278 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
b4324b5d 1279 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
f29972de 1280 }
1da177e4 1281
1da177e4
LT		 1282 return 0;
1283}
1284
6161c038
GP		 1285static int __l2cap_wait_ack(struct sock *sk)
1286{
1287 DECLARE_WAITQUEUE(wait, current);
1288 int err = 0;
1289 int timeo = HZ/5;
1290
2b0b05dd 1291 add_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1292 while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) {
1293 set_current_state(TASK_INTERRUPTIBLE);
1294
1295 if (!timeo)
1296 timeo = HZ/5;
1297
1298 if (signal_pending(current)) {
1299 err = sock_intr_errno(timeo);
1300 break;
1301 }
1302
1303 release_sock(sk);
1304 timeo = schedule_timeout(timeo);
1305 lock_sock(sk);
1306
1307 err = sock_error(sk);
1308 if (err)
1309 break;
1310 }
1311 set_current_state(TASK_RUNNING);
2b0b05dd 1312 remove_wait_queue(sk_sleep(sk), &wait);
6161c038
GP		 1313 return err;
1314}
1315
e90bac06
GP		 1316static void l2cap_monitor_timeout(unsigned long arg)
1317{
1318 struct sock *sk = (void *) arg;
e90bac06 1319
0e98958d
GP		 1320 BT_DBG("sk %p", sk);
1321
e686219a 1322 bh_lock_sock(sk);
e90bac06 1323 if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
9b108fc0 1324 l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED);
b13f5860 1325 bh_unlock_sock(sk);
e90bac06
GP		 1326 return;
1327 }
1328
1329 l2cap_pi(sk)->retry_count++;
1330 __mod_monitor_timer();
1331
a2e12a2a 1332 l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
e686219a 1333 bh_unlock_sock(sk);
e90bac06
GP		 1334}
1335
1336static void l2cap_retrans_timeout(unsigned long arg)
1337{
1338 struct sock *sk = (void *) arg;
e90bac06 1339
0e98958d
GP		 1340 BT_DBG("sk %p", sk);
1341
e686219a 1342 bh_lock_sock(sk);
e90bac06
GP		 1343 l2cap_pi(sk)->retry_count = 1;
1344 __mod_monitor_timer();
1345
1346 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
1347
a2e12a2a 1348 l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL);
e686219a 1349 bh_unlock_sock(sk);
e90bac06
GP		 1350}
1351
1c2acffb 1352static void l2cap_drop_acked_frames(struct sock *sk)
1da177e4 1353{
1c2acffb 1354 struct sk_buff *skb;
1da177e4 1355
812e737e
GP		 1356 while ((skb = skb_peek(TX_QUEUE(sk))) &&
1357 l2cap_pi(sk)->unacked_frames) {
1c2acffb
GP		 1358 if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
1359 break;
1da177e4 1360
1c2acffb
GP		 1361 skb = skb_dequeue(TX_QUEUE(sk));
1362 kfree_skb(skb);
1da177e4 1363
1c2acffb
GP		 1364 l2cap_pi(sk)->unacked_frames--;
1365 }
1da177e4 1366
e90bac06
GP		 1367 if (!l2cap_pi(sk)->unacked_frames)
1368 del_timer(&l2cap_pi(sk)->retrans_timer);
1c2acffb 1369}
1da177e4 1370
9a9c6a34 1371static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb)
1c2acffb
GP		 1372{
1373 struct l2cap_pinfo *pi = l2cap_pi(sk);
1c2acffb
GP		 1374
1375 BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
1da177e4 1376
9a9c6a34 1377 hci_send_acl(pi->conn->hcon, skb, 0);
1c2acffb
GP		 1378}
1379
6840ed07
GP		 1380static int l2cap_streaming_send(struct sock *sk)
1381{
1382 struct sk_buff *skb, *tx_skb;
1383 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1384 u16 control, fcs;
6840ed07
GP		 1385
1386 while ((skb = sk->sk_send_head)) {
1387 tx_skb = skb_clone(skb, GFP_ATOMIC);
1388
1389 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1390 control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
1391 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1392
e8235c6b 1393 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1394 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1395 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1396 }
1397
9a9c6a34 1398 l2cap_do_send(sk, tx_skb);
6840ed07
GP		 1399
1400 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1401
1402 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1403 sk->sk_send_head = NULL;
1404 else
1405 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
1406
1407 skb = skb_dequeue(TX_QUEUE(sk));
1408 kfree_skb(skb);
1409 }
1410 return 0;
1411}
1412
dfc909be 1413static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq)
8f17154f
GP		 1414{
1415 struct l2cap_pinfo *pi = l2cap_pi(sk);
1416 struct sk_buff *skb, *tx_skb;
1417 u16 control, fcs;
8f17154f
GP		 1418
1419 skb = skb_peek(TX_QUEUE(sk));
f11d676d
GP		 1420 if (!skb)
1421 return;
8f17154f 1422
f11d676d
GP		 1423 do {
1424 if (bt_cb(skb)->tx_seq == tx_seq)
8f17154f 1425 break;
8f17154f 1426
f11d676d
GP		 1427 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1428 return;
8f17154f 1429
f11d676d 1430 } while ((skb = skb_queue_next(TX_QUEUE(sk), skb)));
8f17154f 1431
f11d676d
GP		 1432 if (pi->remote_max_tx &&
1433 bt_cb(skb)->retries == pi->remote_max_tx) {
9b108fc0 1434 l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
f11d676d
GP		 1435 return;
1436 }
1437
1438 tx_skb = skb_clone(skb, GFP_ATOMIC);
1439 bt_cb(skb)->retries++;
1440 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
3cb123d1
GP		 1441
1442 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1443 control |= L2CAP_CTRL_FINAL;
1444 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1445 }
95ffa978 1446
f11d676d
GP		 1447 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1448 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
3cb123d1 1449
f11d676d
GP		 1450 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1451
1452 if (pi->fcs == L2CAP_FCS_CRC16) {
1453 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1454 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1455 }
1456
1457 l2cap_do_send(sk, tx_skb);
8f17154f
GP		 1458}
1459
1c2acffb
GP		 1460static int l2cap_ertm_send(struct sock *sk)
1461{
1462 struct sk_buff *skb, *tx_skb;
1463 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1464 u16 control, fcs;
9a9c6a34 1465 int nsent = 0;
1c2acffb 1466
c13ffa62
GP		 1467 if (sk->sk_state != BT_CONNECTED)
1468 return -ENOTCONN;
e90bac06 1469
6e2b6722 1470 while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) {
1c2acffb 1471
e90bac06
GP		 1472 if (pi->remote_max_tx &&
1473 bt_cb(skb)->retries == pi->remote_max_tx) {
9b108fc0 1474 l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED);
e90bac06
GP		 1475 break;
1476 }
1477
e420aba3
AE		 1478 tx_skb = skb_clone(skb, GFP_ATOMIC);
1479
e90bac06
GP		 1480 bt_cb(skb)->retries++;
1481
1c2acffb 1482 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
95ffa978
GP		 1483 control &= L2CAP_CTRL_SAR;
1484
d5392c8f
GP		 1485 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1486 control |= L2CAP_CTRL_FINAL;
1487 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1488 }
9f121a5a 1489 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1c2acffb
GP		 1490 | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1491 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1492
e90bac06 1493
e8235c6b 1494 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1495 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1496 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1497 }
1498
9a9c6a34
GP		 1499 l2cap_do_send(sk, tx_skb);
1500
e90bac06 1501 __mod_retrans_timer();
1c2acffb
GP		 1502
1503 bt_cb(skb)->tx_seq = pi->next_tx_seq;
1504 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1505
1506 pi->unacked_frames++;
d5392c8f 1507 pi->frames_sent++;
1c2acffb
GP		 1508
1509 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1510 sk->sk_send_head = NULL;
1511 else
1512 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
9e917af1
GP		 1513
1514 nsent++;
1c2acffb
GP		 1515 }
1516
9e917af1
GP		 1517 return nsent;
1518}
1519
dfc909be
GP		 1520static int l2cap_retransmit_frames(struct sock *sk)
1521{
1522 struct l2cap_pinfo *pi = l2cap_pi(sk);
1523 int ret;
1524
1525 spin_lock_bh(&pi->send_lock);
1526
1527 if (!skb_queue_empty(TX_QUEUE(sk)))
1528 sk->sk_send_head = TX_QUEUE(sk)->next;
1529
1530 pi->next_tx_seq = pi->expected_ack_seq;
1531 ret = l2cap_ertm_send(sk);
1532
1533 spin_unlock_bh(&pi->send_lock);
1534
1535 return ret;
1536}
1537
9a9c6a34 1538static void l2cap_send_ack(struct l2cap_pinfo *pi)
9e917af1
GP		 1539{
1540 struct sock *sk = (struct sock *)pi;
1541 u16 control = 0;
dfc909be 1542 int nframes;
9e917af1
GP		 1543
1544 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1545
1546 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1547 control |= L2CAP_SUPER_RCV_NOT_READY;
1890d36b 1548 pi->conn_state |= L2CAP_CONN_RNR_SENT;
9a9c6a34
GP		 1549 l2cap_send_sframe(pi, control);
1550 return;
9e917af1 1551 }
dfc909be
GP		 1552
1553 spin_lock_bh(&pi->send_lock);
1554 nframes = l2cap_ertm_send(sk);
1555 spin_unlock_bh(&pi->send_lock);
1556
1557 if (nframes > 0)
1558 return;
1559
1560 control |= L2CAP_SUPER_RCV_READY;
1561 l2cap_send_sframe(pi, control);
1c2acffb
GP		 1562}
1563
9a9c6a34 1564static void l2cap_send_srejtail(struct sock *sk)
99b0d4b7
GP		 1565{
1566 struct srej_list *tail;
1567 u16 control;
1568
1569 control = L2CAP_SUPER_SELECT_REJECT;
1570 control |= L2CAP_CTRL_FINAL;
1571
1572 tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
1573 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1574
1575 l2cap_send_sframe(l2cap_pi(sk), control);
99b0d4b7
GP		 1576}
1577
1c2acffb
GP		 1578static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1579{
1580 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1581 struct sk_buff **frag;
1582 int err, sent = 0;
1da177e4 1583
59203a21 1584 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1c2acffb 1585 return -EFAULT;
1da177e4
LT		 1586
1587 sent += count;
1588 len -= count;
1589
1590 /* Continuation fragments (no L2CAP header) */
1591 frag = &skb_shinfo(skb)->frag_list;
1592 while (len) {
1593 count = min_t(unsigned int, conn->mtu, len);
1594
1595 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1596 if (!*frag)
1c2acffb
GP		 1597 return -EFAULT;
1598 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1599 return -EFAULT;
1da177e4
LT		 1600
1601 sent += count;
1602 len -= count;
1603
1604 frag = &(*frag)->next;
1605 }
1da177e4
LT		 1606
1607 return sent;
1c2acffb 1608}
1da177e4 1609
1c2acffb
GP		 1610static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1611{
1612 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1613 struct sk_buff *skb;
1614 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1615 struct l2cap_hdr *lh;
1616
1617 BT_DBG("sk %p len %d", sk, (int)len);
1618
1619 count = min_t(unsigned int, (conn->mtu - hlen), len);
1620 skb = bt_skb_send_alloc(sk, count + hlen,
1621 msg->msg_flags & MSG_DONTWAIT, &err);
1622 if (!skb)
1623 return ERR_PTR(-ENOMEM);
1624
1625 /* Create L2CAP header */
1626 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1627 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1628 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1629 put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
1630
1631 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1632 if (unlikely(err < 0)) {
1633 kfree_skb(skb);
1634 return ERR_PTR(err);
1635 }
1636 return skb;
1637}
1638
1639static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1640{
1641 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1642 struct sk_buff *skb;
1643 int err, count, hlen = L2CAP_HDR_SIZE;
1644 struct l2cap_hdr *lh;
1645
1646 BT_DBG("sk %p len %d", sk, (int)len);
1647
1648 count = min_t(unsigned int, (conn->mtu - hlen), len);
1649 skb = bt_skb_send_alloc(sk, count + hlen,
1650 msg->msg_flags & MSG_DONTWAIT, &err);
1651 if (!skb)
1652 return ERR_PTR(-ENOMEM);
1653
1654 /* Create L2CAP header */
1655 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1656 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1657 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1658
1659 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1660 if (unlikely(err < 0)) {
1661 kfree_skb(skb);
1662 return ERR_PTR(err);
1663 }
1664 return skb;
1665}
1666
6840ed07 1667static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1c2acffb
GP		 1668{
1669 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1670 struct sk_buff *skb;
1671 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1672 struct l2cap_hdr *lh;
1673
1674 BT_DBG("sk %p len %d", sk, (int)len);
1675
0ee0d208
GP		 1676 if (!conn)
1677 return ERR_PTR(-ENOTCONN);
1678
c74e560c
GP		 1679 if (sdulen)
1680 hlen += 2;
1681
fcc203c3
GP		 1682 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1683 hlen += 2;
1684
1c2acffb
GP		 1685 count = min_t(unsigned int, (conn->mtu - hlen), len);
1686 skb = bt_skb_send_alloc(sk, count + hlen,
1687 msg->msg_flags & MSG_DONTWAIT, &err);
1688 if (!skb)
1689 return ERR_PTR(-ENOMEM);
1690
1691 /* Create L2CAP header */
1692 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1693 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1694 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1695 put_unaligned_le16(control, skb_put(skb, 2));
c74e560c
GP		 1696 if (sdulen)
1697 put_unaligned_le16(sdulen, skb_put(skb, 2));
1c2acffb
GP		 1698
1699 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1700 if (unlikely(err < 0)) {
1701 kfree_skb(skb);
1702 return ERR_PTR(err);
1703 }
e90bac06 1704
fcc203c3
GP		 1705 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1706 put_unaligned_le16(0, skb_put(skb, 2));
1707
e90bac06 1708 bt_cb(skb)->retries = 0;
1c2acffb 1709 return skb;
1da177e4
LT		 1710}
1711
c74e560c
GP		 1712static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
1713{
1714 struct l2cap_pinfo *pi = l2cap_pi(sk);
1715 struct sk_buff *skb;
1716 struct sk_buff_head sar_queue;
1717 u16 control;
1718 size_t size = 0;
1719
ff12fd64 1720 skb_queue_head_init(&sar_queue);
c74e560c 1721 control = L2CAP_SDU_START;
1c762159 1722 skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len);
c74e560c
GP		 1723 if (IS_ERR(skb))
1724 return PTR_ERR(skb);
1725
1726 __skb_queue_tail(&sar_queue, skb);
1c762159
GP		 1727 len -= pi->remote_mps;
1728 size += pi->remote_mps;
c74e560c
GP		 1729
1730 while (len > 0) {
1731 size_t buflen;
1732
1c762159 1733 if (len > pi->remote_mps) {
44651b85 1734 control = L2CAP_SDU_CONTINUE;
1c762159 1735 buflen = pi->remote_mps;
c74e560c 1736 } else {
44651b85 1737 control = L2CAP_SDU_END;
c74e560c
GP		 1738 buflen = len;
1739 }
1740
6840ed07 1741 skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0);
c74e560c
GP		 1742 if (IS_ERR(skb)) {
1743 skb_queue_purge(&sar_queue);
1744 return PTR_ERR(skb);
1745 }
1746
1747 __skb_queue_tail(&sar_queue, skb);
1748 len -= buflen;
1749 size += buflen;
c74e560c
GP		 1750 }
1751 skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
dfc909be 1752 spin_lock_bh(&pi->send_lock);
c74e560c
GP		 1753 if (sk->sk_send_head == NULL)
1754 sk->sk_send_head = sar_queue.next;
dfc909be 1755 spin_unlock_bh(&pi->send_lock);
c74e560c
GP		 1756
1757 return size;
1758}
1759
1da177e4
LT		 1760static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
1761{
1762 struct sock *sk = sock->sk;
1c2acffb
GP		 1763 struct l2cap_pinfo *pi = l2cap_pi(sk);
1764 struct sk_buff *skb;
1765 u16 control;
1766 int err;
1da177e4
LT		 1767
1768 BT_DBG("sock %p, sk %p", sock, sk);
1769
c1cbe4b7
BL		 1770 err = sock_error(sk);
1771 if (err)
1772 return err;
1da177e4
LT		 1773
1774 if (msg->msg_flags & MSG_OOB)
1775 return -EOPNOTSUPP;
1776
1da177e4
LT		 1777 lock_sock(sk);
1778
1c2acffb 1779 if (sk->sk_state != BT_CONNECTED) {
1da177e4 1780 err = -ENOTCONN;
1c2acffb
GP		 1781 goto done;
1782 }
1da177e4 1783
1c2acffb
GP		 1784 /* Connectionless channel */
1785 if (sk->sk_type == SOCK_DGRAM) {
1786 skb = l2cap_create_connless_pdu(sk, msg, len);
9a9c6a34 1787 if (IS_ERR(skb)) {
477fffb0 1788 err = PTR_ERR(skb);
9a9c6a34
GP		 1789 } else {
1790 l2cap_do_send(sk, skb);
1791 err = len;
1792 }
1c2acffb
GP		 1793 goto done;
1794 }
1795
1796 switch (pi->mode) {
1797 case L2CAP_MODE_BASIC:
c69163e9
GP		 1798 /* Check outgoing MTU */
1799 if (len > pi->omtu) {
1800 err = -EINVAL;
1801 goto done;
1802 }
1803
1c2acffb
GP		 1804 /* Create a basic PDU */
1805 skb = l2cap_create_basic_pdu(sk, msg, len);
1806 if (IS_ERR(skb)) {
1807 err = PTR_ERR(skb);
1808 goto done;
1809 }
1810
9a9c6a34
GP		 1811 l2cap_do_send(sk, skb);
1812 err = len;
1c2acffb
GP		 1813 break;
1814
1815 case L2CAP_MODE_ERTM:
6840ed07 1816 case L2CAP_MODE_STREAMING:
1c2acffb 1817 /* Entire SDU fits into one PDU */
1c762159 1818 if (len <= pi->remote_mps) {
1c2acffb 1819 control = L2CAP_SDU_UNSEGMENTED;
6840ed07 1820 skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
1c2acffb
GP		 1821 if (IS_ERR(skb)) {
1822 err = PTR_ERR(skb);
1823 goto done;
1824 }
c74e560c 1825 __skb_queue_tail(TX_QUEUE(sk), skb);
dfc909be
GP		 1826
1827 if (pi->mode == L2CAP_MODE_ERTM)
1828 spin_lock_bh(&pi->send_lock);
1829
c74e560c
GP		 1830 if (sk->sk_send_head == NULL)
1831 sk->sk_send_head = skb;
dfc909be
GP		 1832
1833 if (pi->mode == L2CAP_MODE_ERTM)
1834 spin_unlock_bh(&pi->send_lock);
1c2acffb 1835 } else {
c74e560c
GP		 1836 /* Segment SDU into multiples PDUs */
1837 err = l2cap_sar_segment_sdu(sk, msg, len);
1838 if (err < 0)
1839 goto done;
1c2acffb 1840 }
1c2acffb 1841
dfc909be 1842 if (pi->mode == L2CAP_MODE_STREAMING) {
6840ed07 1843 err = l2cap_streaming_send(sk);
dfc909be 1844 } else {
6e2b6722
GP		 1845 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY &&
1846 pi->conn_state && L2CAP_CONN_WAIT_F) {
1847 err = len;
1848 break;
1849 }
dfc909be 1850 spin_lock_bh(&pi->send_lock);
6840ed07 1851 err = l2cap_ertm_send(sk);
dfc909be
GP		 1852 spin_unlock_bh(&pi->send_lock);
1853 }
6840ed07 1854
9e917af1 1855 if (err >= 0)
1c2acffb
GP		 1856 err = len;
1857 break;
1858
1859 default:
1860 BT_DBG("bad state %1.1x", pi->mode);
1861 err = -EINVAL;
1862 }
1863
1864done:
1da177e4
LT		 1865 release_sock(sk);
1866 return err;
1867}
1868
f66dc81f
MH		 1869static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
1870{
1871 struct sock *sk = sock->sk;
1872
1873 lock_sock(sk);
1874
1875 if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
1876 struct l2cap_conn_rsp rsp;
1877
1878 sk->sk_state = BT_CONFIG;
1879
1880 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1881 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
1882 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1883 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1884 l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
1885 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1886
1887 release_sock(sk);
1888 return 0;
1889 }
1890
1891 release_sock(sk);
1892
1893 return bt_sock_recvmsg(iocb, sock, msg, len, flags);
1894}
1895
b7058842 1896static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 1897{
1898 struct sock *sk = sock->sk;
1899 struct l2cap_options opts;
f29972de 1900 int len, err = 0;
1da177e4
LT		 1901 u32 opt;
1902
1903 BT_DBG("sk %p", sk);
1904
1905 lock_sock(sk);
1906
1907 switch (optname) {
1908 case L2CAP_OPTIONS:
0878b666
MH		 1909 opts.imtu = l2cap_pi(sk)->imtu;
1910 opts.omtu = l2cap_pi(sk)->omtu;
1911 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 1912 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 1913 opts.fcs = l2cap_pi(sk)->fcs;
68d7f0ce 1914 opts.max_tx = l2cap_pi(sk)->max_tx;
14b5aa71 1915 opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
0878b666 1916
1da177e4
LT		 1917 len = min_t(unsigned int, sizeof(opts), optlen);
1918 if (copy_from_user((char *) &opts, optval, len)) {
1919 err = -EFAULT;
1920 break;
1921 }
0878b666 1922
45d65c46
GP		 1923 if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) {
1924 err = -EINVAL;
1925 break;
1926 }
1927
0041ecfa
JPRV		 1928 l2cap_pi(sk)->mode = opts.mode;
1929 switch (l2cap_pi(sk)->mode) {
1930 case L2CAP_MODE_BASIC:
85eb53c6 1931 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE;
0041ecfa
JPRV		 1932 break;
1933 case L2CAP_MODE_ERTM:
1934 case L2CAP_MODE_STREAMING:
1935 if (enable_ertm)
1936 break;
1937 /* fall through */
1938 default:
1939 err = -EINVAL;
1940 break;
1941 }
1942
c6b03cf9
MH		 1943 l2cap_pi(sk)->imtu = opts.imtu;
1944 l2cap_pi(sk)->omtu = opts.omtu;
fcc203c3 1945 l2cap_pi(sk)->fcs = opts.fcs;
68d7f0ce 1946 l2cap_pi(sk)->max_tx = opts.max_tx;
14b5aa71 1947 l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size;
1da177e4
LT		 1948 break;
1949
1950 case L2CAP_LM:
1951 if (get_user(opt, (u32 __user *) optval)) {
1952 err = -EFAULT;
1953 break;
1954 }
1955
2af6b9d5
MH		 1956 if (opt & L2CAP_LM_AUTH)
1957 l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
1958 if (opt & L2CAP_LM_ENCRYPT)
1959 l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
1960 if (opt & L2CAP_LM_SECURE)
1961 l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
1962
1963 l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
1964 l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
1da177e4
LT		 1965 break;
1966
1967 default:
1968 err = -ENOPROTOOPT;
1969 break;
1970 }
1971
1972 release_sock(sk);
1973 return err;
1974}
1975
b7058842 1976static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
d58daf42
MH		 1977{
1978 struct sock *sk = sock->sk;
2af6b9d5
MH		 1979 struct bt_security sec;
1980 int len, err = 0;
f66dc81f 1981 u32 opt;
d58daf42
MH		 1982
1983 BT_DBG("sk %p", sk);
1984
1985 if (level == SOL_L2CAP)
1986 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
1987
0588d94f
MH		 1988 if (level != SOL_BLUETOOTH)
1989 return -ENOPROTOOPT;
1990
d58daf42
MH		 1991 lock_sock(sk);
1992
1993 switch (optname) {
2af6b9d5 1994 case BT_SECURITY:
bd3c9e25
GP		 1995 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
1996 && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 1997 err = -EINVAL;
1998 break;
1999 }
2000
2af6b9d5
MH		 2001 sec.level = BT_SECURITY_LOW;
2002
2003 len = min_t(unsigned int, sizeof(sec), optlen);
2004 if (copy_from_user((char *) &sec, optval, len)) {
2005 err = -EFAULT;
2006 break;
2007 }
2008
2009 if (sec.level < BT_SECURITY_LOW ||
2010 sec.level > BT_SECURITY_HIGH) {
2011 err = -EINVAL;
2012 break;
2013 }
2014
2015 l2cap_pi(sk)->sec_level = sec.level;
2016 break;
2017
f66dc81f
MH		 2018 case BT_DEFER_SETUP:
2019 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2020 err = -EINVAL;
2021 break;
2022 }
2023
2024 if (get_user(opt, (u32 __user *) optval)) {
2025 err = -EFAULT;
2026 break;
2027 }
2028
2029 bt_sk(sk)->defer_setup = opt;
2030 break;
2031
d58daf42
MH		 2032 default:
2033 err = -ENOPROTOOPT;
2034 break;
2035 }
2036
2037 release_sock(sk);
2038 return err;
2039}
2040
2041static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
1da177e4
LT		 2042{
2043 struct sock *sk = sock->sk;
2044 struct l2cap_options opts;
2045 struct l2cap_conninfo cinfo;
2046 int len, err = 0;
2af6b9d5 2047 u32 opt;
1da177e4
LT		 2048
2049 BT_DBG("sk %p", sk);
2050
2051 if (get_user(len, optlen))
2052 return -EFAULT;
2053
2054 lock_sock(sk);
2055
2056 switch (optname) {
2057 case L2CAP_OPTIONS:
2058 opts.imtu = l2cap_pi(sk)->imtu;
2059 opts.omtu = l2cap_pi(sk)->omtu;
2060 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 2061 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 2062 opts.fcs = l2cap_pi(sk)->fcs;
68d7f0ce 2063 opts.max_tx = l2cap_pi(sk)->max_tx;
14b5aa71 2064 opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win;
1da177e4
LT		 2065
2066 len = min_t(unsigned int, len, sizeof(opts));
2067 if (copy_to_user(optval, (char *) &opts, len))
2068 err = -EFAULT;
2069
2070 break;
2071
2072 case L2CAP_LM:
2af6b9d5
MH		 2073 switch (l2cap_pi(sk)->sec_level) {
2074 case BT_SECURITY_LOW:
2075 opt = L2CAP_LM_AUTH;
2076 break;
2077 case BT_SECURITY_MEDIUM:
2078 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
2079 break;
2080 case BT_SECURITY_HIGH:
2081 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
2082 L2CAP_LM_SECURE;
2083 break;
2084 default:
2085 opt = 0;
2086 break;
2087 }
2088
2089 if (l2cap_pi(sk)->role_switch)
2090 opt |= L2CAP_LM_MASTER;
2091
2092 if (l2cap_pi(sk)->force_reliable)
2093 opt |= L2CAP_LM_RELIABLE;
2094
2095 if (put_user(opt, (u32 __user *) optval))
1da177e4
LT		 2096 err = -EFAULT;
2097 break;
2098
2099 case L2CAP_CONNINFO:
f66dc81f
MH		 2100 if (sk->sk_state != BT_CONNECTED &&
2101 !(sk->sk_state == BT_CONNECT2 &&
2102 bt_sk(sk)->defer_setup)) {
1da177e4
LT		 2103 err = -ENOTCONN;
2104 break;
2105 }
2106
2107 cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
2108 memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
2109
2110 len = min_t(unsigned int, len, sizeof(cinfo));
2111 if (copy_to_user(optval, (char *) &cinfo, len))
2112 err = -EFAULT;
2113
2114 break;
2115
2116 default:
2117 err = -ENOPROTOOPT;
2118 break;
2119 }
2120
2121 release_sock(sk);
2122 return err;
2123}
2124
d58daf42
MH		 2125static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
2126{
2127 struct sock *sk = sock->sk;
2af6b9d5 2128 struct bt_security sec;
d58daf42
MH		 2129 int len, err = 0;
2130
2131 BT_DBG("sk %p", sk);
2132
2133 if (level == SOL_L2CAP)
2134 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
2135
0588d94f
MH		 2136 if (level != SOL_BLUETOOTH)
2137 return -ENOPROTOOPT;
2138
d58daf42
MH		 2139 if (get_user(len, optlen))
2140 return -EFAULT;
2141
2142 lock_sock(sk);
2143
2144 switch (optname) {
2af6b9d5 2145 case BT_SECURITY:
bd3c9e25
GP		 2146 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM
2147 && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 2148 err = -EINVAL;
2149 break;
2150 }
2151
2af6b9d5
MH		 2152 sec.level = l2cap_pi(sk)->sec_level;
2153
2154 len = min_t(unsigned int, len, sizeof(sec));
2155 if (copy_to_user(optval, (char *) &sec, len))
2156 err = -EFAULT;
2157
2158 break;
2159
f66dc81f
MH		 2160 case BT_DEFER_SETUP:
2161 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2162 err = -EINVAL;
2163 break;
2164 }
2165
2166 if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
2167 err = -EFAULT;
2168
2169 break;
2170
d58daf42
MH		 2171 default:
2172 err = -ENOPROTOOPT;
2173 break;
2174 }
2175
2176 release_sock(sk);
2177 return err;
2178}
2179
1da177e4
LT		 2180static int l2cap_sock_shutdown(struct socket *sock, int how)
2181{
2182 struct sock *sk = sock->sk;
2183 int err = 0;
2184
2185 BT_DBG("sock %p, sk %p", sock, sk);
2186
2187 if (!sk)
2188 return 0;
2189
2190 lock_sock(sk);
2191 if (!sk->sk_shutdown) {
6161c038
GP		 2192 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2193 err = __l2cap_wait_ack(sk);
2194
1da177e4
LT		 2195 sk->sk_shutdown = SHUTDOWN_MASK;
2196 l2cap_sock_clear_timer(sk);
2197 __l2cap_sock_close(sk, 0);
2198
2199 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
b1235d79
MH		 2200 err = bt_sock_wait_state(sk, BT_CLOSED,
2201 sk->sk_lingertime);
1da177e4 2202 }
9b108fc0
GP		 2203
2204 if (!err && sk->sk_err)
2205 err = -sk->sk_err;
2206
1da177e4
LT		 2207 release_sock(sk);
2208 return err;
2209}
2210
2211static int l2cap_sock_release(struct socket *sock)
2212{
2213 struct sock *sk = sock->sk;
2214 int err;
2215
2216 BT_DBG("sock %p, sk %p", sock, sk);
2217
2218 if (!sk)
2219 return 0;
2220
2221 err = l2cap_sock_shutdown(sock, 2);
2222
2223 sock_orphan(sk);
2224 l2cap_sock_kill(sk);
2225 return err;
2226}
2227
1da177e4
LT		 2228static void l2cap_chan_ready(struct sock *sk)
2229{
2230 struct sock *parent = bt_sk(sk)->parent;
2231
2232 BT_DBG("sk %p, parent %p", sk, parent);
2233
2234 l2cap_pi(sk)->conf_state = 0;
2235 l2cap_sock_clear_timer(sk);
2236
2237 if (!parent) {
2238 /* Outgoing channel.
2239 * Wake up socket sleeping on connect.
2240 */
2241 sk->sk_state = BT_CONNECTED;
2242 sk->sk_state_change(sk);
2243 } else {
2244 /* Incoming channel.
2245 * Wake up socket sleeping on accept.
2246 */
2247 parent->sk_data_ready(parent, 0);
2248 }
2249}
2250
2251/* Copy frame to all raw sockets on that connection */
2252static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2253{
2254 struct l2cap_chan_list *l = &conn->chan_list;
2255 struct sk_buff *nskb;
af05b30b 2256 struct sock *sk;
1da177e4
LT		 2257
2258 BT_DBG("conn %p", conn);
2259
2260 read_lock(&l->lock);
2261 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2262 if (sk->sk_type != SOCK_RAW)
2263 continue;
2264
2265 /* Don't send frame to the socket it came from */
2266 if (skb->sk == sk)
2267 continue;
af05b30b
GP		 2268 nskb = skb_clone(skb, GFP_ATOMIC);
2269 if (!nskb)
1da177e4
LT		 2270 continue;
2271
2272 if (sock_queue_rcv_skb(sk, nskb))
2273 kfree_skb(nskb);
2274 }
2275 read_unlock(&l->lock);
2276}
2277
2278/* ---- L2CAP signalling commands ---- */
2279static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2280 u8 code, u8 ident, u16 dlen, void *data)
2281{
2282 struct sk_buff *skb, **frag;
2283 struct l2cap_cmd_hdr *cmd;
2284 struct l2cap_hdr *lh;
2285 int len, count;
2286
af05b30b
GP		 2287 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2288 conn, code, ident, dlen);
1da177e4
LT		 2289
2290 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2291 count = min_t(unsigned int, conn->mtu, len);
2292
2293 skb = bt_skb_alloc(count, GFP_ATOMIC);
2294 if (!skb)
2295 return NULL;
2296
2297 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2298 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
8db4dc46 2299 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2300
2301 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2302 cmd->code = code;
2303 cmd->ident = ident;
aca3192c 2304 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2305
2306 if (dlen) {
2307 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2308 memcpy(skb_put(skb, count), data, count);
2309 data += count;
2310 }
2311
2312 len -= skb->len;
2313
2314 /* Continuation fragments (no L2CAP header) */
2315 frag = &skb_shinfo(skb)->frag_list;
2316 while (len) {
2317 count = min_t(unsigned int, conn->mtu, len);
2318
2319 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2320 if (!*frag)
2321 goto fail;
2322
2323 memcpy(skb_put(*frag, count), data, count);
2324
2325 len -= count;
2326 data += count;
2327
2328 frag = &(*frag)->next;
2329 }
2330
2331 return skb;
2332
2333fail:
2334 kfree_skb(skb);
2335 return NULL;
2336}
2337
2338static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2339{
2340 struct l2cap_conf_opt *opt = *ptr;
2341 int len;
2342
2343 len = L2CAP_CONF_OPT_SIZE + opt->len;
2344 *ptr += len;
2345
2346 *type = opt->type;
2347 *olen = opt->len;
2348
2349 switch (opt->len) {
2350 case 1:
2351 *val = *((u8 *) opt->val);
2352 break;
2353
2354 case 2:
861d6882 2355 *val = __le16_to_cpu(*((__le16 *) opt->val));
1da177e4
LT		 2356 break;
2357
2358 case 4:
861d6882 2359 *val = __le32_to_cpu(*((__le32 *) opt->val));
1da177e4
LT		 2360 break;
2361
2362 default:
2363 *val = (unsigned long) opt->val;
2364 break;
2365 }
2366
2367 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2368 return len;
2369}
2370
1da177e4
LT		 2371static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2372{
2373 struct l2cap_conf_opt *opt = *ptr;
2374
2375 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2376
2377 opt->type = type;
2378 opt->len = len;
2379
2380 switch (len) {
2381 case 1:
2382 *((u8 *) opt->val) = val;
2383 break;
2384
2385 case 2:
8e036fc3 2386 *((__le16 *) opt->val) = cpu_to_le16(val);
1da177e4
LT		 2387 break;
2388
2389 case 4:
8e036fc3 2390 *((__le32 *) opt->val) = cpu_to_le32(val);
1da177e4
LT		 2391 break;
2392
2393 default:
2394 memcpy(opt->val, (void *) val, len);
2395 break;
2396 }
2397
2398 *ptr += L2CAP_CONF_OPT_SIZE + len;
2399}
2400
c1b4f43b
GP		 2401static void l2cap_ack_timeout(unsigned long arg)
2402{
2403 struct sock *sk = (void *) arg;
2404
2405 bh_lock_sock(sk);
2406 l2cap_send_ack(l2cap_pi(sk));
2407 bh_unlock_sock(sk);
2408}
2409
0565c1c2
GP		 2410static inline void l2cap_ertm_init(struct sock *sk)
2411{
2412 l2cap_pi(sk)->expected_ack_seq = 0;
2413 l2cap_pi(sk)->unacked_frames = 0;
2414 l2cap_pi(sk)->buffer_seq = 0;
803020c6 2415 l2cap_pi(sk)->num_acked = 0;
d5392c8f 2416 l2cap_pi(sk)->frames_sent = 0;
0565c1c2
GP		 2417
2418 setup_timer(&l2cap_pi(sk)->retrans_timer,
2419 l2cap_retrans_timeout, (unsigned long) sk);
2420 setup_timer(&l2cap_pi(sk)->monitor_timer,
2421 l2cap_monitor_timeout, (unsigned long) sk);
c1b4f43b
GP		 2422 setup_timer(&l2cap_pi(sk)->ack_timer,
2423 l2cap_ack_timeout, (unsigned long) sk);
0565c1c2
GP		 2424
2425 __skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b 2426 __skb_queue_head_init(BUSY_QUEUE(sk));
dfc909be 2427 spin_lock_init(&l2cap_pi(sk)->send_lock);
1890d36b
GP		 2428
2429 INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work);
0565c1c2
GP		 2430}
2431
f2fcfcd6
GP		 2432static int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
2433{
2434 u32 local_feat_mask = l2cap_feat_mask;
2435 if (enable_ertm)
6840ed07 2436 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
f2fcfcd6
GP		 2437
2438 switch (mode) {
2439 case L2CAP_MODE_ERTM:
2440 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
2441 case L2CAP_MODE_STREAMING:
2442 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
2443 default:
2444 return 0x00;
2445 }
2446}
2447
2448static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2449{
2450 switch (mode) {
2451 case L2CAP_MODE_STREAMING:
2452 case L2CAP_MODE_ERTM:
2453 if (l2cap_mode_supported(mode, remote_feat_mask))
2454 return mode;
2455 /* fall through */
2456 default:
2457 return L2CAP_MODE_BASIC;
2458 }
2459}
2460
1da177e4
LT		 2461static int l2cap_build_conf_req(struct sock *sk, void *data)
2462{
2463 struct l2cap_pinfo *pi = l2cap_pi(sk);
2464 struct l2cap_conf_req *req = data;
bd3c9e25 2465 struct l2cap_conf_rfc rfc = { .mode = pi->mode };
1da177e4
LT		 2466 void *ptr = req->data;
2467
2468 BT_DBG("sk %p", sk);
2469
f2fcfcd6
GP		 2470 if (pi->num_conf_req || pi->num_conf_rsp)
2471 goto done;
2472
2473 switch (pi->mode) {
2474 case L2CAP_MODE_STREAMING:
2475 case L2CAP_MODE_ERTM:
2ba13ed6 2476 if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE)
85eb53c6 2477 break;
85eb53c6 2478
2ba13ed6 2479 /* fall through */
f2fcfcd6
GP		 2480 default:
2481 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2482 break;
2483 }
2484
2485done:
65c7c491
MH		 2486 switch (pi->mode) {
2487 case L2CAP_MODE_BASIC:
2488 if (pi->imtu != L2CAP_DEFAULT_MTU)
2489 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
62547752
GP		 2490
2491 rfc.mode = L2CAP_MODE_BASIC;
2492 rfc.txwin_size = 0;
2493 rfc.max_transmit = 0;
2494 rfc.retrans_timeout = 0;
2495 rfc.monitor_timeout = 0;
2496 rfc.max_pdu_size = 0;
2497
65c7c491
MH		 2498 break;
2499
2500 case L2CAP_MODE_ERTM:
2501 rfc.mode = L2CAP_MODE_ERTM;
14b5aa71 2502 rfc.txwin_size = pi->tx_win;
68d7f0ce 2503 rfc.max_transmit = pi->max_tx;
f2fcfcd6
GP		 2504 rfc.retrans_timeout = 0;
2505 rfc.monitor_timeout = 0;
c74e560c 2506 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2507 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2508 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
f2fcfcd6 2509
fcc203c3
GP		 2510 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2511 break;
2512
2513 if (pi->fcs == L2CAP_FCS_NONE ||
2514 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2515 pi->fcs = L2CAP_FCS_NONE;
2516 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2517 }
f2fcfcd6
GP		 2518 break;
2519
2520 case L2CAP_MODE_STREAMING:
2521 rfc.mode = L2CAP_MODE_STREAMING;
2522 rfc.txwin_size = 0;
2523 rfc.max_transmit = 0;
2524 rfc.retrans_timeout = 0;
2525 rfc.monitor_timeout = 0;
c74e560c 2526 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2527 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2528 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
65c7c491 2529
fcc203c3
GP		 2530 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2531 break;
2532
2533 if (pi->fcs == L2CAP_FCS_NONE ||
2534 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2535 pi->fcs = L2CAP_FCS_NONE;
2536 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2537 }
65c7c491
MH		 2538 break;
2539 }
1da177e4 2540
62547752
GP		 2541 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2542 (unsigned long) &rfc);
2543
1da177e4
LT		 2544 /* FIXME: Need actual value of the flush timeout */
2545 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2546 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2547
aca3192c
YH		 2548 req->dcid = cpu_to_le16(pi->dcid);
2549 req->flags = cpu_to_le16(0);
1da177e4
LT		 2550
2551 return ptr - data;
2552}
2553
5dee9e7c 2554static int l2cap_parse_conf_req(struct sock *sk, void *data)
1da177e4
LT		 2555{
2556 struct l2cap_pinfo *pi = l2cap_pi(sk);
5dee9e7c
MH		 2557 struct l2cap_conf_rsp *rsp = data;
2558 void *ptr = rsp->data;
2559 void *req = pi->conf_req;
2560 int len = pi->conf_len;
2561 int type, hint, olen;
2562 unsigned long val;
6464f35f 2563 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 2564 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2565 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2566
5dee9e7c 2567 BT_DBG("sk %p", sk);
820ae1b8 2568
5dee9e7c
MH		 2569 while (len >= L2CAP_CONF_OPT_SIZE) {
2570 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2571
589d2746 2572 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2573 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2574
2575 switch (type) {
2576 case L2CAP_CONF_MTU:
861d6882 2577 mtu = val;
5dee9e7c
MH		 2578 break;
2579
2580 case L2CAP_CONF_FLUSH_TO:
2581 pi->flush_to = val;
2582 break;
2583
2584 case L2CAP_CONF_QOS:
2585 break;
2586
6464f35f
MH		 2587 case L2CAP_CONF_RFC:
2588 if (olen == sizeof(rfc))
2589 memcpy(&rfc, (void *) val, olen);
2590 break;
2591
fcc203c3
GP		 2592 case L2CAP_CONF_FCS:
2593 if (val == L2CAP_FCS_NONE)
2594 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2595
2596 break;
2597
5dee9e7c
MH		 2598 default:
2599 if (hint)
2600 break;
2601
2602 result = L2CAP_CONF_UNKNOWN;
2603 *((u8 *) ptr++) = type;
2604 break;
2605 }
2606 }
2607
f2fcfcd6
GP		 2608 if (pi->num_conf_rsp || pi->num_conf_req)
2609 goto done;
2610
2611 switch (pi->mode) {
2612 case L2CAP_MODE_STREAMING:
2613 case L2CAP_MODE_ERTM:
85eb53c6
GP		 2614 if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
2615 pi->mode = l2cap_select_mode(rfc.mode,
2616 pi->conn->feat_mask);
2617 break;
2618 }
2619
742e519b 2620 if (pi->mode != rfc.mode)
f2fcfcd6 2621 return -ECONNREFUSED;
742e519b 2622
f2fcfcd6 2623 break;
f2fcfcd6
GP		 2624 }
2625
2626done:
2627 if (pi->mode != rfc.mode) {
2628 result = L2CAP_CONF_UNACCEPT;
2629 rfc.mode = pi->mode;
2630
2631 if (pi->num_conf_rsp == 1)
2632 return -ECONNREFUSED;
2633
2634 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2635 sizeof(rfc), (unsigned long) &rfc);
2636 }
2637
2638
5dee9e7c
MH		 2639 if (result == L2CAP_CONF_SUCCESS) {
2640 /* Configure output options and let the other side know
2641 * which ones we don't like. */
2642
f2fcfcd6
GP		 2643 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2644 result = L2CAP_CONF_UNACCEPT;
2645 else {
2646 pi->omtu = mtu;
2647 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2648 }
2649 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
6464f35f 2650
f2fcfcd6
GP		 2651 switch (rfc.mode) {
2652 case L2CAP_MODE_BASIC:
2653 pi->fcs = L2CAP_FCS_NONE;
2654 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2655 break;
2656
2657 case L2CAP_MODE_ERTM:
2658 pi->remote_tx_win = rfc.txwin_size;
2659 pi->remote_max_tx = rfc.max_transmit;
1c762159
GP		 2660 if (rfc.max_pdu_size > pi->conn->mtu - 10)
2661 rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
2662
2663 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6 2664
10467e9e
GP		 2665 rfc.retrans_timeout =
2666 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2667 rfc.monitor_timeout =
2668 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6
GP		 2669
2670 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2671
2672 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2673 sizeof(rfc), (unsigned long) &rfc);
2674
f2fcfcd6
GP		 2675 break;
2676
2677 case L2CAP_MODE_STREAMING:
1c762159
GP		 2678 if (rfc.max_pdu_size > pi->conn->mtu - 10)
2679 rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
2680
2681 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2682
2683 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2684
2685 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2686 sizeof(rfc), (unsigned long) &rfc);
2687
f2fcfcd6
GP		 2688 break;
2689
2690 default:
5dee9e7c 2691 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2692
6464f35f 2693 memset(&rfc, 0, sizeof(rfc));
f2fcfcd6
GP		 2694 rfc.mode = pi->mode;
2695 }
6464f35f 2696
f2fcfcd6
GP		 2697 if (result == L2CAP_CONF_SUCCESS)
2698 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2699 }
5dee9e7c
MH		 2700 rsp->scid = cpu_to_le16(pi->dcid);
2701 rsp->result = cpu_to_le16(result);
2702 rsp->flags = cpu_to_le16(0x0000);
2703
2704 return ptr - data;
1da177e4
LT		 2705}
2706
f2fcfcd6
GP		 2707static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2708{
2709 struct l2cap_pinfo *pi = l2cap_pi(sk);
2710 struct l2cap_conf_req *req = data;
2711 void *ptr = req->data;
2712 int type, olen;
2713 unsigned long val;
2714 struct l2cap_conf_rfc rfc;
2715
2716 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2717
2718 while (len >= L2CAP_CONF_OPT_SIZE) {
2719 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2720
2721 switch (type) {
2722 case L2CAP_CONF_MTU:
2723 if (val < L2CAP_DEFAULT_MIN_MTU) {
2724 *result = L2CAP_CONF_UNACCEPT;
2725 pi->omtu = L2CAP_DEFAULT_MIN_MTU;
2726 } else
2727 pi->omtu = val;
2728 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2729 break;
2730
2731 case L2CAP_CONF_FLUSH_TO:
2732 pi->flush_to = val;
2733 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2734 2, pi->flush_to);
2735 break;
2736
2737 case L2CAP_CONF_RFC:
2738 if (olen == sizeof(rfc))
2739 memcpy(&rfc, (void *)val, olen);
2740
2741 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2742 rfc.mode != pi->mode)
2743 return -ECONNREFUSED;
2744
f2fcfcd6
GP		 2745 pi->fcs = 0;
2746
2747 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2748 sizeof(rfc), (unsigned long) &rfc);
2749 break;
2750 }
2751 }
2752
6c2ea7a8
GP		 2753 if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode)
2754 return -ECONNREFUSED;
2755
2756 pi->mode = rfc.mode;
2757
f2fcfcd6
GP		 2758 if (*result == L2CAP_CONF_SUCCESS) {
2759 switch (rfc.mode) {
2760 case L2CAP_MODE_ERTM:
2761 pi->remote_tx_win = rfc.txwin_size;
10467e9e
GP		 2762 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2763 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
1c762159 2764 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2765 break;
2766 case L2CAP_MODE_STREAMING:
1c762159 2767 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2768 }
2769 }
2770
2771 req->dcid = cpu_to_le16(pi->dcid);
2772 req->flags = cpu_to_le16(0x0000);
2773
2774 return ptr - data;
2775}
2776
5dee9e7c 2777static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1da177e4
LT		 2778{
2779 struct l2cap_conf_rsp *rsp = data;
2780 void *ptr = rsp->data;
1da177e4 2781
5dee9e7c 2782 BT_DBG("sk %p", sk);
1da177e4 2783
aca3192c 2784 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
5dee9e7c 2785 rsp->result = cpu_to_le16(result);
aca3192c 2786 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2787
2788 return ptr - data;
2789}
2790
7b1c0049
GP		 2791static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
2792{
2793 struct l2cap_pinfo *pi = l2cap_pi(sk);
2794 int type, olen;
2795 unsigned long val;
2796 struct l2cap_conf_rfc rfc;
2797
2798 BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
2799
2800 if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
2801 return;
2802
2803 while (len >= L2CAP_CONF_OPT_SIZE) {
2804 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2805
2806 switch (type) {
2807 case L2CAP_CONF_RFC:
2808 if (olen == sizeof(rfc))
2809 memcpy(&rfc, (void *)val, olen);
2810 goto done;
2811 }
2812 }
2813
2814done:
2815 switch (rfc.mode) {
2816 case L2CAP_MODE_ERTM:
2817 pi->remote_tx_win = rfc.txwin_size;
10467e9e
GP		 2818 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2819 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
7b1c0049
GP		 2820 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2821 break;
2822 case L2CAP_MODE_STREAMING:
2823 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2824 }
2825}
2826
4e8402a3
MH		 2827static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2828{
2829 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2830
2831 if (rej->reason != 0x0000)
2832 return 0;
2833
2834 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2835 cmd->ident == conn->info_ident) {
4e8402a3 2836 del_timer(&conn->info_timer);
984947dc
MH		 2837
2838 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2839 conn->info_ident = 0;
984947dc 2840
4e8402a3
MH		 2841 l2cap_conn_start(conn);
2842 }
2843
2844 return 0;
2845}
2846
1da177e4
LT		 2847static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2848{
2849 struct l2cap_chan_list *list = &conn->chan_list;
2850 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2851 struct l2cap_conn_rsp rsp;
2852 struct sock *sk, *parent;
e7c29cb1 2853 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2854
2855 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2856 __le16 psm = req->psm;
1da177e4
LT		 2857
2858 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2859
2860 /* Check if we have socket listening on psm */
2861 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2862 if (!parent) {
2863 result = L2CAP_CR_BAD_PSM;
2864 goto sendresp;
2865 }
2866
e7c29cb1
MH		 2867 /* Check if the ACL is secure enough (if not SDP) */
2868 if (psm != cpu_to_le16(0x0001) &&
2869 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2870 conn->disc_reason = 0x05;
e7c29cb1
MH		 2871 result = L2CAP_CR_SEC_BLOCK;
2872 goto response;
2873 }
2874
1da177e4
LT		 2875 result = L2CAP_CR_NO_MEM;
2876
2877 /* Check for backlog size */
2878 if (sk_acceptq_is_full(parent)) {
8e87d142 2879 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2880 goto response;
2881 }
2882
3b1e0a65 2883 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1da177e4
LT		 2884 if (!sk)
2885 goto response;
2886
fd1278d7 2887 write_lock_bh(&list->lock);
1da177e4
LT		 2888
2889 /* Check if we already have channel with that dcid */
2890 if (__l2cap_get_chan_by_dcid(list, scid)) {
fd1278d7 2891 write_unlock_bh(&list->lock);
1da177e4
LT		 2892 sock_set_flag(sk, SOCK_ZAPPED);
2893 l2cap_sock_kill(sk);
2894 goto response;
2895 }
2896
2897 hci_conn_hold(conn->hcon);
2898
2899 l2cap_sock_init(sk, parent);
2900 bacpy(&bt_sk(sk)->src, conn->src);
2901 bacpy(&bt_sk(sk)->dst, conn->dst);
2902 l2cap_pi(sk)->psm = psm;
2903 l2cap_pi(sk)->dcid = scid;
2904
2905 __l2cap_chan_add(conn, sk, parent);
2906 dcid = l2cap_pi(sk)->scid;
2907
2908 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2909
1da177e4
LT		 2910 l2cap_pi(sk)->ident = cmd->ident;
2911
984947dc 2912 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2af6b9d5 2913 if (l2cap_check_security(sk)) {
f66dc81f
MH		 2914 if (bt_sk(sk)->defer_setup) {
2915 sk->sk_state = BT_CONNECT2;
2916 result = L2CAP_CR_PEND;
2917 status = L2CAP_CS_AUTHOR_PEND;
2918 parent->sk_data_ready(parent, 0);
2919 } else {
2920 sk->sk_state = BT_CONFIG;
2921 result = L2CAP_CR_SUCCESS;
2922 status = L2CAP_CS_NO_INFO;
2923 }
79d554a6
MH		 2924 } else {
2925 sk->sk_state = BT_CONNECT2;
2926 result = L2CAP_CR_PEND;
2927 status = L2CAP_CS_AUTHEN_PEND;
2928 }
2929 } else {
2930 sk->sk_state = BT_CONNECT2;
2931 result = L2CAP_CR_PEND;
2932 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2933 }
2934
fd1278d7 2935 write_unlock_bh(&list->lock);
1da177e4
LT		 2936
2937response:
2938 bh_unlock_sock(parent);
2939
2940sendresp:
aca3192c
YH		 2941 rsp.scid = cpu_to_le16(scid);
2942 rsp.dcid = cpu_to_le16(dcid);
2943 rsp.result = cpu_to_le16(result);
2944 rsp.status = cpu_to_le16(status);
1da177e4 2945 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2946
2947 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2948 struct l2cap_info_req info;
2949 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2950
2951 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2952 conn->info_ident = l2cap_get_ident(conn);
2953
2954 mod_timer(&conn->info_timer, jiffies +
2955 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2956
2957 l2cap_send_cmd(conn, conn->info_ident,
2958 L2CAP_INFO_REQ, sizeof(info), &info);
2959 }
2960
1da177e4
LT		 2961 return 0;
2962}
2963
2964static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2965{
2966 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2967 u16 scid, dcid, result, status;
2968 struct sock *sk;
2969 u8 req[128];
2970
2971 scid = __le16_to_cpu(rsp->scid);
2972 dcid = __le16_to_cpu(rsp->dcid);
2973 result = __le16_to_cpu(rsp->result);
2974 status = __le16_to_cpu(rsp->status);
2975
2976 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2977
2978 if (scid) {
af05b30b
GP		 2979 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2980 if (!sk)
1da177e4
LT		 2981 return 0;
2982 } else {
af05b30b
GP		 2983 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
2984 if (!sk)
1da177e4
LT		 2985 return 0;
2986 }
2987
2988 switch (result) {
2989 case L2CAP_CR_SUCCESS:
2990 sk->sk_state = BT_CONFIG;
2991 l2cap_pi(sk)->ident = 0;
2992 l2cap_pi(sk)->dcid = dcid;
2993 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
6a8d3010
MH		 2994 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
2995
1da177e4
LT		 2996 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2997 l2cap_build_conf_req(sk, req), req);
f2fcfcd6 2998 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 2999 break;
3000
3001 case L2CAP_CR_PEND:
6a8d3010 3002 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 3003 break;
3004
3005 default:
3006 l2cap_chan_del(sk, ECONNREFUSED);
3007 break;
3008 }
3009
3010 bh_unlock_sock(sk);
3011 return 0;
3012}
3013
88219a0f 3014static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3015{
3016 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3017 u16 dcid, flags;
3018 u8 rsp[64];
3019 struct sock *sk;
5dee9e7c 3020 int len;
1da177e4
LT		 3021
3022 dcid = __le16_to_cpu(req->dcid);
3023 flags = __le16_to_cpu(req->flags);
3024
3025 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3026
af05b30b
GP		 3027 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3028 if (!sk)
1da177e4
LT		 3029 return -ENOENT;
3030
354f60a9
MH		 3031 if (sk->sk_state == BT_DISCONN)
3032 goto unlock;
3033
5dee9e7c 3034 /* Reject if config buffer is too small. */
88219a0f 3035 len = cmd_len - sizeof(*req);
5dee9e7c
MH		 3036 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
3037 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3038 l2cap_build_conf_rsp(sk, rsp,
3039 L2CAP_CONF_REJECT, flags), rsp);
3040 goto unlock;
3041 }
3042
3043 /* Store config. */
3044 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
3045 l2cap_pi(sk)->conf_len += len;
1da177e4
LT		 3046
3047 if (flags & 0x0001) {
3048 /* Incomplete config. Send empty response. */
3049 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
5dee9e7c
MH		 3050 l2cap_build_conf_rsp(sk, rsp,
3051 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 3052 goto unlock;
3053 }
3054
3055 /* Complete config. */
5dee9e7c 3056 len = l2cap_parse_conf_req(sk, rsp);
f2fcfcd6 3057 if (len < 0) {
9b108fc0 3058 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4 3059 goto unlock;
f2fcfcd6 3060 }
1da177e4 3061
5dee9e7c 3062 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
f2fcfcd6 3063 l2cap_pi(sk)->num_conf_rsp++;
5dee9e7c 3064
5dee9e7c
MH		 3065 /* Reset config buffer. */
3066 l2cap_pi(sk)->conf_len = 0;
3067
876d9484
MH		 3068 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
3069 goto unlock;
3070
1da177e4 3071 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
f64f9e71
JP		 3072 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
3073 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 3074 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
3075
1da177e4 3076 sk->sk_state = BT_CONNECTED;
e90bac06 3077
0565c1c2
GP		 3078 l2cap_pi(sk)->next_tx_seq = 0;
3079 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3080 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3081 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3082 l2cap_ertm_init(sk);
3083
1da177e4 3084 l2cap_chan_ready(sk);
876d9484
MH		 3085 goto unlock;
3086 }
3087
3088 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 3089 u8 buf[64];
1da177e4 3090 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
79d554a6 3091 l2cap_build_conf_req(sk, buf), buf);
f2fcfcd6 3092 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3093 }
3094
3095unlock:
3096 bh_unlock_sock(sk);
3097 return 0;
3098}
3099
3100static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3101{
3102 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3103 u16 scid, flags, result;
3104 struct sock *sk;
7b1c0049 3105 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 3106
3107 scid = __le16_to_cpu(rsp->scid);
3108 flags = __le16_to_cpu(rsp->flags);
3109 result = __le16_to_cpu(rsp->result);
3110
af05b30b
GP		 3111 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
3112 scid, flags, result);
1da177e4 3113
af05b30b
GP		 3114 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3115 if (!sk)
1da177e4
LT		 3116 return 0;
3117
3118 switch (result) {
3119 case L2CAP_CONF_SUCCESS:
7b1c0049 3120 l2cap_conf_rfc_get(sk, rsp->data, len);
1da177e4
LT		 3121 break;
3122
3123 case L2CAP_CONF_UNACCEPT:
f2fcfcd6 3124 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3125 char req[64];
3126
c2c77ec8 3127 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
9b108fc0 3128 l2cap_send_disconn_req(conn, sk, ECONNRESET);
c2c77ec8
AE		 3129 goto done;
3130 }
3131
f2fcfcd6
GP		 3132 /* throw out any old stored conf requests */
3133 result = L2CAP_CONF_SUCCESS;
3134 len = l2cap_parse_conf_rsp(sk, rsp->data,
3135 len, req, &result);
3136 if (len < 0) {
9b108fc0 3137 l2cap_send_disconn_req(conn, sk, ECONNRESET);
f2fcfcd6
GP		 3138 goto done;
3139 }
3140
3141 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3142 L2CAP_CONF_REQ, len, req);
3143 l2cap_pi(sk)->num_conf_req++;
3144 if (result != L2CAP_CONF_SUCCESS)
3145 goto done;
3146 break;
1da177e4
LT		 3147 }
3148
8e87d142 3149 default:
b1235d79 3150 sk->sk_err = ECONNRESET;
1da177e4 3151 l2cap_sock_set_timer(sk, HZ * 5);
9b108fc0 3152 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4
LT		 3153 goto done;
3154 }
3155
3156 if (flags & 0x01)
3157 goto done;
3158
1da177e4
LT		 3159 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
3160
3161 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
f64f9e71
JP		 3162 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
3163 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 3164 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
3165
1da177e4 3166 sk->sk_state = BT_CONNECTED;
0565c1c2 3167 l2cap_pi(sk)->next_tx_seq = 0;
1c2acffb 3168 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3169 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3170 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3171 l2cap_ertm_init(sk);
3172
1da177e4
LT		 3173 l2cap_chan_ready(sk);
3174 }
3175
3176done:
3177 bh_unlock_sock(sk);
3178 return 0;
3179}
3180
3181static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3182{
3183 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3184 struct l2cap_disconn_rsp rsp;
3185 u16 dcid, scid;
3186 struct sock *sk;
3187
3188 scid = __le16_to_cpu(req->scid);
3189 dcid = __le16_to_cpu(req->dcid);
3190
3191 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3192
af05b30b
GP		 3193 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3194 if (!sk)
1da177e4
LT		 3195 return 0;
3196
aca3192c
YH		 3197 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3198 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1da177e4
LT		 3199 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3200
3201 sk->sk_shutdown = SHUTDOWN_MASK;
3202
3203 l2cap_chan_del(sk, ECONNRESET);
3204 bh_unlock_sock(sk);
3205
3206 l2cap_sock_kill(sk);
3207 return 0;
3208}
3209
3210static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3211{
3212 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3213 u16 dcid, scid;
3214 struct sock *sk;
3215
3216 scid = __le16_to_cpu(rsp->scid);
3217 dcid = __le16_to_cpu(rsp->dcid);
3218
3219 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3220
af05b30b
GP		 3221 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3222 if (!sk)
1da177e4
LT		 3223 return 0;
3224
3225 l2cap_chan_del(sk, 0);
3226 bh_unlock_sock(sk);
3227
3228 l2cap_sock_kill(sk);
3229 return 0;
3230}
3231
3232static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3233{
3234 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3235 u16 type;
3236
3237 type = __le16_to_cpu(req->type);
3238
3239 BT_DBG("type 0x%4.4x", type);
3240
f0709e03
MH		 3241 if (type == L2CAP_IT_FEAT_MASK) {
3242 u8 buf[8];
44dd46de 3243 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3244 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3245 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3246 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
44dd46de 3247 if (enable_ertm)
fcc203c3
GP		 3248 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3249 | L2CAP_FEAT_FCS;
1b7bf4ed 3250 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3251 l2cap_send_cmd(conn, cmd->ident,
3252 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3253 } else if (type == L2CAP_IT_FIXED_CHAN) {
3254 u8 buf[12];
3255 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3256 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3257 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3258 memcpy(buf + 4, l2cap_fixed_chan, 8);
3259 l2cap_send_cmd(conn, cmd->ident,
3260 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3261 } else {
3262 struct l2cap_info_rsp rsp;
3263 rsp.type = cpu_to_le16(type);
3264 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3265 l2cap_send_cmd(conn, cmd->ident,
3266 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3267 }
1da177e4
LT		 3268
3269 return 0;
3270}
3271
3272static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3273{
3274 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3275 u16 type, result;
3276
3277 type = __le16_to_cpu(rsp->type);
3278 result = __le16_to_cpu(rsp->result);
3279
3280 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3281
4e8402a3
MH		 3282 del_timer(&conn->info_timer);
3283
984947dc 3284 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3285 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3286
47ec1dcd 3287 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3288 struct l2cap_info_req req;
3289 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3290
3291 conn->info_ident = l2cap_get_ident(conn);
3292
3293 l2cap_send_cmd(conn, conn->info_ident,
3294 L2CAP_INFO_REQ, sizeof(req), &req);
3295 } else {
3296 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3297 conn->info_ident = 0;
3298
3299 l2cap_conn_start(conn);
3300 }
3301 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3302 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3303 conn->info_ident = 0;
984947dc
MH		 3304
3305 l2cap_conn_start(conn);
3306 }
4e8402a3 3307
1da177e4
LT		 3308 return 0;
3309}
3310
3311static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3312{
3313 u8 *data = skb->data;
3314 int len = skb->len;
3315 struct l2cap_cmd_hdr cmd;
3316 int err = 0;
3317
3318 l2cap_raw_recv(conn, skb);
3319
3320 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3321 u16 cmd_len;
1da177e4
LT		 3322 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3323 data += L2CAP_CMD_HDR_SIZE;
3324 len -= L2CAP_CMD_HDR_SIZE;
3325
88219a0f 3326 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3327
88219a0f 3328 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3329
88219a0f 3330 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3331 BT_DBG("corrupted command");
3332 break;
3333 }
3334
3335 switch (cmd.code) {
3336 case L2CAP_COMMAND_REJ:
4e8402a3 3337 l2cap_command_rej(conn, &cmd, data);
1da177e4
LT		 3338 break;
3339
3340 case L2CAP_CONN_REQ:
3341 err = l2cap_connect_req(conn, &cmd, data);
3342 break;
3343
3344 case L2CAP_CONN_RSP:
3345 err = l2cap_connect_rsp(conn, &cmd, data);
3346 break;
3347
3348 case L2CAP_CONF_REQ:
88219a0f 3349 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1da177e4
LT		 3350 break;
3351
3352 case L2CAP_CONF_RSP:
3353 err = l2cap_config_rsp(conn, &cmd, data);
3354 break;
3355
3356 case L2CAP_DISCONN_REQ:
3357 err = l2cap_disconnect_req(conn, &cmd, data);
3358 break;
3359
3360 case L2CAP_DISCONN_RSP:
3361 err = l2cap_disconnect_rsp(conn, &cmd, data);
3362 break;
3363
3364 case L2CAP_ECHO_REQ:
88219a0f 3365 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1da177e4
LT		 3366 break;
3367
3368 case L2CAP_ECHO_RSP:
3369 break;
3370
3371 case L2CAP_INFO_REQ:
3372 err = l2cap_information_req(conn, &cmd, data);
3373 break;
3374
3375 case L2CAP_INFO_RSP:
3376 err = l2cap_information_rsp(conn, &cmd, data);
3377 break;
3378
3379 default:
3380 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3381 err = -EINVAL;
3382 break;
3383 }
3384
3385 if (err) {
3386 struct l2cap_cmd_rej rej;
3387 BT_DBG("error %d", err);
3388
3389 /* FIXME: Map err to a valid reason */
aca3192c 3390 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3391 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3392 }
3393
88219a0f
AV		 3394 data += cmd_len;
3395 len -= cmd_len;
1da177e4
LT		 3396 }
3397
3398 kfree_skb(skb);
3399}
3400
fcc203c3
GP		 3401static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3402{
3403 u16 our_fcs, rcv_fcs;
3404 int hdr_size = L2CAP_HDR_SIZE + 2;
3405
3406 if (pi->fcs == L2CAP_FCS_CRC16) {
3407 skb_trim(skb, skb->len - 2);
3408 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3409 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3410
3411 if (our_fcs != rcv_fcs)
3412 return -EINVAL;
3413 }
3414 return 0;
3415}
3416
d5392c8f
GP		 3417static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3418{
3419 struct l2cap_pinfo *pi = l2cap_pi(sk);
3420 u16 control = 0;
3421
3422 pi->frames_sent = 0;
d5392c8f
GP		 3423
3424 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3425
3426 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
64988868 3427 control |= L2CAP_SUPER_RCV_NOT_READY;
d5392c8f 3428 l2cap_send_sframe(pi, control);
1890d36b 3429 pi->conn_state |= L2CAP_CONN_RNR_SENT;
d5392c8f
GP		 3430 }
3431
4ea727ef
GP		 3432 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY)
3433 l2cap_retransmit_frames(sk);
d5392c8f 3434
dfc909be 3435 spin_lock_bh(&pi->send_lock);
d5392c8f 3436 l2cap_ertm_send(sk);
dfc909be 3437 spin_unlock_bh(&pi->send_lock);
d5392c8f
GP		 3438
3439 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3440 pi->frames_sent == 0) {
3441 control |= L2CAP_SUPER_RCV_READY;
d5392c8f
GP		 3442 l2cap_send_sframe(pi, control);
3443 }
3444}
3445
9b53350d 3446static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
8f17154f
GP		 3447{
3448 struct sk_buff *next_skb;
bfbacc11
JPRV		 3449 struct l2cap_pinfo *pi = l2cap_pi(sk);
3450 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3451
3452 bt_cb(skb)->tx_seq = tx_seq;
3453 bt_cb(skb)->sar = sar;
3454
3455 next_skb = skb_peek(SREJ_QUEUE(sk));
3456 if (!next_skb) {
3457 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d 3458 return 0;
8f17154f
GP		 3459 }
3460
bfbacc11
JPRV		 3461 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3462 if (tx_seq_offset < 0)
3463 tx_seq_offset += 64;
3464
8f17154f 3465 do {
9b53350d
JPRV		 3466 if (bt_cb(next_skb)->tx_seq == tx_seq)
3467 return -EINVAL;
3468
bfbacc11
JPRV		 3469 next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
3470 pi->buffer_seq) % 64;
3471 if (next_tx_seq_offset < 0)
3472 next_tx_seq_offset += 64;
3473
3474 if (next_tx_seq_offset > tx_seq_offset) {
8f17154f 3475 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
9b53350d 3476 return 0;
8f17154f
GP		 3477 }
3478
3479 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3480 break;
3481
59203a21 3482 } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
8f17154f
GP		 3483
3484 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d
JPRV		 3485
3486 return 0;
8f17154f
GP		 3487}
3488
18778a63
GP		 3489static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3490{
3491 struct l2cap_pinfo *pi = l2cap_pi(sk);
3492 struct sk_buff *_skb;
1890d36b 3493 int err;
18778a63
GP		 3494
3495 switch (control & L2CAP_CTRL_SAR) {
3496 case L2CAP_SDU_UNSEGMENTED:
3497 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3498 goto drop;
3499
3500 err = sock_queue_rcv_skb(sk, skb);
3501 if (!err)
3502 return err;
3503
3504 break;
3505
3506 case L2CAP_SDU_START:
3507 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3508 goto drop;
3509
3510 pi->sdu_len = get_unaligned_le16(skb->data);
18778a63
GP		 3511
3512 if (pi->sdu_len > pi->imtu)
3513 goto disconnect;
3514
3515 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
1890d36b
GP		 3516 if (!pi->sdu)
3517 return -ENOMEM;
3518
3519 /* pull sdu_len bytes only after alloc, because of Local Busy
3520 * condition we have to be sure that this will be executed
3521 * only once, i.e., when alloc does not fail */
3522 skb_pull(skb, 2);
18778a63
GP		 3523
3524 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3525
3526 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3527 pi->partial_sdu_len = skb->len;
3528 break;
3529
3530 case L2CAP_SDU_CONTINUE:
3531 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3532 goto disconnect;
3533
3534 if (!pi->sdu)
3535 goto disconnect;
3536
18778a63
GP		 3537 pi->partial_sdu_len += skb->len;
3538 if (pi->partial_sdu_len > pi->sdu_len)
3539 goto drop;
3540
4178ba46
GP		 3541 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3542
18778a63
GP		 3543 break;
3544
3545 case L2CAP_SDU_END:
3546 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3547 goto disconnect;
3548
3549 if (!pi->sdu)
3550 goto disconnect;
3551
1890d36b 3552 if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) {
1890d36b 3553 pi->partial_sdu_len += skb->len;
18778a63 3554
1890d36b
GP		 3555 if (pi->partial_sdu_len > pi->imtu)
3556 goto drop;
18778a63 3557
1890d36b
GP		 3558 if (pi->partial_sdu_len != pi->sdu_len)
3559 goto drop;
4178ba46
GP		 3560
3561 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
1890d36b 3562 }
18778a63
GP		 3563
3564 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
1890d36b
GP		 3565 if (!_skb) {
3566 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3567 return -ENOMEM;
3568 }
3569
18778a63 3570 err = sock_queue_rcv_skb(sk, _skb);
1890d36b 3571 if (err < 0) {
18778a63 3572 kfree_skb(_skb);
1890d36b
GP		 3573 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3574 return err;
3575 }
3576
3577 pi->conn_state &= ~L2CAP_CONN_SAR_RETRY;
3578 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
18778a63
GP		 3579
3580 kfree_skb(pi->sdu);
3581 break;
3582 }
3583
3584 kfree_skb(skb);
1890d36b 3585 return 0;
18778a63
GP		 3586
3587drop:
3588 kfree_skb(pi->sdu);
3589 pi->sdu = NULL;
3590
3591disconnect:
9b108fc0 3592 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
18778a63
GP		 3593 kfree_skb(skb);
3594 return 0;
3595}
3596
1890d36b
GP		 3597static void l2cap_busy_work(struct work_struct *work)
3598{
3599 DECLARE_WAITQUEUE(wait, current);
3600 struct l2cap_pinfo *pi =
3601 container_of(work, struct l2cap_pinfo, busy_work);
3602 struct sock *sk = (struct sock *)pi;
3603 int n_tries = 0, timeo = HZ/5, err;
3604 struct sk_buff *skb;
3605 u16 control;
3606
3607 lock_sock(sk);
3608
2b0b05dd 3609 add_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3610 while ((skb = skb_peek(BUSY_QUEUE(sk)))) {
3611 set_current_state(TASK_INTERRUPTIBLE);
3612
3613 if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
3614 err = -EBUSY;
9b108fc0 3615 l2cap_send_disconn_req(pi->conn, sk, EBUSY);
1890d36b
GP		 3616 goto done;
3617 }
3618
3619 if (!timeo)
3620 timeo = HZ/5;
3621
3622 if (signal_pending(current)) {
3623 err = sock_intr_errno(timeo);
3624 goto done;
3625 }
3626
3627 release_sock(sk);
3628 timeo = schedule_timeout(timeo);
3629 lock_sock(sk);
3630
3631 err = sock_error(sk);
3632 if (err)
3633 goto done;
3634
3635 while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) {
3636 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3637 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3638 if (err < 0) {
3639 skb_queue_head(BUSY_QUEUE(sk), skb);
3640 break;
3641 }
3642
3643 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3644 }
3645
3646 if (!skb)
3647 break;
3648 }
3649
3650 if (!(pi->conn_state & L2CAP_CONN_RNR_SENT))
3651 goto done;
3652
3653 control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3654 control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
3655 l2cap_send_sframe(pi, control);
3656 l2cap_pi(sk)->retry_count = 1;
3657
3658 del_timer(&pi->retrans_timer);
3659 __mod_monitor_timer();
3660
3661 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
3662
3663done:
3664 pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
3665 pi->conn_state &= ~L2CAP_CONN_RNR_SENT;
3666
0e98958d
GP		 3667 BT_DBG("sk %p, Exit local busy", sk);
3668
1890d36b 3669 set_current_state(TASK_RUNNING);
2b0b05dd 3670 remove_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3671
3672 release_sock(sk);
3673}
3674
3675static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control)
3676{
3677 struct l2cap_pinfo *pi = l2cap_pi(sk);
3678 int sctrl, err;
3679
3680 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3681 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3682 __skb_queue_tail(BUSY_QUEUE(sk), skb);
3683 return -EBUSY;
3684 }
3685
3686 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3687 if (err >= 0) {
3688 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3689 return err;
3690 }
3691
3692 /* Busy Condition */
0e98958d
GP		 3693 BT_DBG("sk %p, Enter local busy", sk);
3694
1890d36b
GP		 3695 pi->conn_state |= L2CAP_CONN_LOCAL_BUSY;
3696 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3697 __skb_queue_tail(BUSY_QUEUE(sk), skb);
3698
3699 sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3700 sctrl |= L2CAP_SUPER_RCV_NOT_READY;
3701 l2cap_send_sframe(pi, sctrl);
3702
3703 pi->conn_state |= L2CAP_CONN_RNR_SENT;
3704
7fe9b298
GP		 3705 del_timer(&pi->ack_timer);
3706
1890d36b
GP		 3707 queue_work(_busy_wq, &pi->busy_work);
3708
3709 return err;
3710}
3711
18778a63 3712static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
c74e560c
GP		 3713{
3714 struct l2cap_pinfo *pi = l2cap_pi(sk);
3715 struct sk_buff *_skb;
3716 int err = -EINVAL;
3717
18778a63
GP		 3718 /*
3719 * TODO: We have to notify the userland if some data is lost with the
3720 * Streaming Mode.
3721 */
3722
c74e560c
GP		 3723 switch (control & L2CAP_CTRL_SAR) {
3724 case L2CAP_SDU_UNSEGMENTED:
3725 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3726 kfree_skb(pi->sdu);
3727 break;
3728 }
3729
3730 err = sock_queue_rcv_skb(sk, skb);
3731 if (!err)
3732 return 0;
3733
3734 break;
3735
3736 case L2CAP_SDU_START:
3737 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3738 kfree_skb(pi->sdu);
3739 break;
3740 }
3741
3742 pi->sdu_len = get_unaligned_le16(skb->data);
3743 skb_pull(skb, 2);
3744
052897ca
GP		 3745 if (pi->sdu_len > pi->imtu) {
3746 err = -EMSGSIZE;
3747 break;
3748 }
3749
c74e560c
GP		 3750 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3751 if (!pi->sdu) {
3752 err = -ENOMEM;
3753 break;
3754 }
3755
3756 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3757
3758 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3759 pi->partial_sdu_len = skb->len;
3760 err = 0;
3761 break;
3762
3763 case L2CAP_SDU_CONTINUE:
3764 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3765 break;
3766
3767 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3768
3769 pi->partial_sdu_len += skb->len;
3770 if (pi->partial_sdu_len > pi->sdu_len)
3771 kfree_skb(pi->sdu);
3772 else
3773 err = 0;
3774
3775 break;
3776
3777 case L2CAP_SDU_END:
3778 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3779 break;
3780
3781 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3782
3783 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3784 pi->partial_sdu_len += skb->len;
3785
36f2fd58
GP		 3786 if (pi->partial_sdu_len > pi->imtu)
3787 goto drop;
3788
c74e560c
GP		 3789 if (pi->partial_sdu_len == pi->sdu_len) {
3790 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3791 err = sock_queue_rcv_skb(sk, _skb);
3792 if (err < 0)
3793 kfree_skb(_skb);
3794 }
c74e560c
GP		 3795 err = 0;
3796
36f2fd58
GP		 3797drop:
3798 kfree_skb(pi->sdu);
c74e560c
GP		 3799 break;
3800 }
3801
3802 kfree_skb(skb);
3803 return err;
3804}
3805
8f17154f
GP		 3806static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3807{
3808 struct sk_buff *skb;
afefdbc4 3809 u16 control;
8f17154f 3810
59203a21 3811 while ((skb = skb_peek(SREJ_QUEUE(sk)))) {
8f17154f
GP		 3812 if (bt_cb(skb)->tx_seq != tx_seq)
3813 break;
3814
3815 skb = skb_dequeue(SREJ_QUEUE(sk));
afefdbc4 3816 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
18778a63 3817 l2cap_ertm_reassembly_sdu(sk, skb, control);
8f17154f
GP		 3818 l2cap_pi(sk)->buffer_seq_srej =
3819 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
8ff50ec0 3820 tx_seq = (tx_seq + 1) % 64;
8f17154f
GP		 3821 }
3822}
3823
3824static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3825{
3826 struct l2cap_pinfo *pi = l2cap_pi(sk);
3827 struct srej_list *l, *tmp;
3828 u16 control;
3829
59203a21 3830 list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
8f17154f
GP		 3831 if (l->tx_seq == tx_seq) {
3832 list_del(&l->list);
3833 kfree(l);
3834 return;
3835 }
3836 control = L2CAP_SUPER_SELECT_REJECT;
3837 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3838 l2cap_send_sframe(pi, control);
3839 list_del(&l->list);
3840 list_add_tail(&l->list, SREJ_LIST(sk));
3841 }
3842}
3843
3844static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3845{
3846 struct l2cap_pinfo *pi = l2cap_pi(sk);
3847 struct srej_list *new;
3848 u16 control;
3849
3850 while (tx_seq != pi->expected_tx_seq) {
3851 control = L2CAP_SUPER_SELECT_REJECT;
3852 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3853 l2cap_send_sframe(pi, control);
3854
3855 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
8ff50ec0
GP		 3856 new->tx_seq = pi->expected_tx_seq;
3857 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3858 list_add_tail(&new->list, SREJ_LIST(sk));
3859 }
8ff50ec0 3860 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3861}
3862
1c2acffb
GP		 3863static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3864{
3865 struct l2cap_pinfo *pi = l2cap_pi(sk);
3866 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3867 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3868 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
f6337c77 3869 int tx_seq_offset, expected_tx_seq_offset;
803020c6 3870 int num_to_ack = (pi->tx_win/6) + 1;
1c2acffb
GP		 3871 int err = 0;
3872
0e98958d
GP		 3873 BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq,
3874 rx_control);
1c2acffb 3875
9b16dc65
GP		 3876 if (L2CAP_CTRL_FINAL & rx_control &&
3877 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
1d8f5d16
GP		 3878 del_timer(&pi->monitor_timer);
3879 if (pi->unacked_frames > 0)
3880 __mod_retrans_timer();
3881 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
3882 }
3883
9f121a5a
GP		 3884 pi->expected_ack_seq = req_seq;
3885 l2cap_drop_acked_frames(sk);
3886
8f17154f
GP		 3887 if (tx_seq == pi->expected_tx_seq)
3888 goto expected;
1c2acffb 3889
9b53350d
JPRV		 3890 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3891 if (tx_seq_offset < 0)
3892 tx_seq_offset += 64;
3893
3894 /* invalid tx_seq */
3895 if (tx_seq_offset >= pi->tx_win) {
9b108fc0 3896 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
9b53350d
JPRV		 3897 goto drop;
3898 }
3899
1890d36b
GP		 3900 if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY)
3901 goto drop;
3902
8f17154f
GP		 3903 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3904 struct srej_list *first;
30afb5b2 3905
8f17154f
GP		 3906 first = list_first_entry(SREJ_LIST(sk),
3907 struct srej_list, list);
3908 if (tx_seq == first->tx_seq) {
3909 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3910 l2cap_check_srej_gap(sk, tx_seq);
3911
3912 list_del(&first->list);
3913 kfree(first);
3914
3915 if (list_empty(SREJ_LIST(sk))) {
3916 pi->buffer_seq = pi->buffer_seq_srej;
3917 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
855666cc 3918 l2cap_send_ack(pi);
0e98958d 3919 BT_DBG("sk %p, Exit SREJ_SENT", sk);
8f17154f
GP		 3920 }
3921 } else {
3922 struct srej_list *l;
9b53350d
JPRV		 3923
3924 /* duplicated tx_seq */
3925 if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
3926 goto drop;
8f17154f
GP		 3927
3928 list_for_each_entry(l, SREJ_LIST(sk), list) {
3929 if (l->tx_seq == tx_seq) {
3930 l2cap_resend_srejframe(sk, tx_seq);
3931 return 0;
3932 }
3933 }
3934 l2cap_send_srejframe(sk, tx_seq);
30afb5b2
GP		 3935 }
3936 } else {
9b53350d
JPRV		 3937 expected_tx_seq_offset =
3938 (pi->expected_tx_seq - pi->buffer_seq) % 64;
3939 if (expected_tx_seq_offset < 0)
3940 expected_tx_seq_offset += 64;
3941
3942 /* duplicated tx_seq */
3943 if (tx_seq_offset < expected_tx_seq_offset)
3944 goto drop;
3945
8f17154f 3946 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 3947
0e98958d
GP		 3948 BT_DBG("sk %p, Enter SREJ", sk);
3949
8f17154f
GP		 3950 INIT_LIST_HEAD(SREJ_LIST(sk));
3951 pi->buffer_seq_srej = pi->buffer_seq;
3952
3953 __skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b 3954 __skb_queue_head_init(BUSY_QUEUE(sk));
8f17154f
GP		 3955 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3956
ef54fd93
GP		 3957 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
3958
8f17154f 3959 l2cap_send_srejframe(sk, tx_seq);
7fe9b298
GP		 3960
3961 del_timer(&pi->ack_timer);
1c2acffb 3962 }
30afb5b2
GP		 3963 return 0;
3964
8f17154f
GP		 3965expected:
3966 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3967
3968 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3b1a9f3f
GP		 3969 bt_cb(skb)->tx_seq = tx_seq;
3970 bt_cb(skb)->sar = sar;
3971 __skb_queue_tail(SREJ_QUEUE(sk), skb);
8f17154f
GP		 3972 return 0;
3973 }
3974
2ece3684
GP		 3975 err = l2cap_push_rx_skb(sk, skb, rx_control);
3976 if (err < 0)
3977 return 0;
3978
4ec10d97
GP		 3979 if (rx_control & L2CAP_CTRL_FINAL) {
3980 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3981 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 3982 else
3983 l2cap_retransmit_frames(sk);
4ec10d97
GP		 3984 }
3985
c1b4f43b
GP		 3986 __mod_ack_timer();
3987
803020c6
GP		 3988 pi->num_acked = (pi->num_acked + 1) % num_to_ack;
3989 if (pi->num_acked == num_to_ack - 1)
9e917af1
GP		 3990 l2cap_send_ack(pi);
3991
8f17154f 3992 return 0;
9b53350d
JPRV		 3993
3994drop:
3995 kfree_skb(skb);
3996 return 0;
1c2acffb
GP		 3997}
3998
e072745f 3999static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
1c2acffb
GP		 4000{
4001 struct l2cap_pinfo *pi = l2cap_pi(sk);
6e3a5981 4002
0e98958d
GP		 4003 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control),
4004 rx_control);
4005
6e3a5981
GP		 4006 pi->expected_ack_seq = __get_reqseq(rx_control);
4007 l2cap_drop_acked_frames(sk);
1c2acffb 4008
e072745f 4009 if (rx_control & L2CAP_CTRL_POLL) {
3cb123d1 4010 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
05fbd89d
GP		 4011 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
4012 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4013 (pi->unacked_frames > 0))
4014 __mod_retrans_timer();
4015
4016 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4017 l2cap_send_srejtail(sk);
4018 } else {
4019 l2cap_send_i_or_rr_or_rnr(sk);
05fbd89d 4020 }
1d8f5d16 4021
e072745f
GP		 4022 } else if (rx_control & L2CAP_CTRL_FINAL) {
4023 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 4024
e072745f
GP		 4025 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4026 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4027 else
4028 l2cap_retransmit_frames(sk);
2246b2f1 4029
e072745f 4030 } else {
e072745f
GP		 4031 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4032 (pi->unacked_frames > 0))
4033 __mod_retrans_timer();
1c2acffb 4034
2246b2f1 4035 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
dfc909be 4036 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
e072745f 4037 l2cap_send_ack(pi);
dfc909be
GP		 4038 } else {
4039 spin_lock_bh(&pi->send_lock);
e072745f 4040 l2cap_ertm_send(sk);
dfc909be
GP		 4041 spin_unlock_bh(&pi->send_lock);
4042 }
e072745f
GP		 4043 }
4044}
2246b2f1 4045
e072745f
GP		 4046static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
4047{
4048 struct l2cap_pinfo *pi = l2cap_pi(sk);
4049 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4050
0e98958d
GP		 4051 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4052
e072745f
GP		 4053 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4054
8abb52ee 4055 pi->expected_ack_seq = tx_seq;
e072745f
GP		 4056 l2cap_drop_acked_frames(sk);
4057
4058 if (rx_control & L2CAP_CTRL_FINAL) {
4059 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4060 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4061 else
4062 l2cap_retransmit_frames(sk);
e072745f 4063 } else {
dfc909be 4064 l2cap_retransmit_frames(sk);
30afb5b2 4065
0301ef04 4066 if (pi->conn_state & L2CAP_CONN_WAIT_F)
e072745f 4067 pi->conn_state |= L2CAP_CONN_REJ_ACT;
e072745f
GP		 4068 }
4069}
4070static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
4071{
4072 struct l2cap_pinfo *pi = l2cap_pi(sk);
4073 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4074
0e98958d
GP		 4075 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4076
e072745f 4077 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 4078
e072745f
GP		 4079 if (rx_control & L2CAP_CTRL_POLL) {
4080 pi->expected_ack_seq = tx_seq;
4081 l2cap_drop_acked_frames(sk);
3cb123d1
GP		 4082
4083 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
dfc909be
GP		 4084 l2cap_retransmit_one_frame(sk, tx_seq);
4085
4086 spin_lock_bh(&pi->send_lock);
e072745f 4087 l2cap_ertm_send(sk);
dfc909be
GP		 4088 spin_unlock_bh(&pi->send_lock);
4089
e072745f
GP		 4090 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4091 pi->srej_save_reqseq = tx_seq;
4092 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4093 }
e072745f
GP		 4094 } else if (rx_control & L2CAP_CTRL_FINAL) {
4095 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
4096 pi->srej_save_reqseq == tx_seq)
4097 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
4098 else
dfc909be 4099 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f 4100 } else {
dfc909be 4101 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f
GP		 4102 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4103 pi->srej_save_reqseq = tx_seq;
4104 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4105 }
e072745f
GP		 4106 }
4107}
4108
4109static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
4110{
4111 struct l2cap_pinfo *pi = l2cap_pi(sk);
4112 u8 tx_seq = __get_reqseq(rx_control);
4113
0e98958d
GP		 4114 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4115
e072745f
GP		 4116 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
4117 pi->expected_ack_seq = tx_seq;
4118 l2cap_drop_acked_frames(sk);
4119
3cb123d1
GP		 4120 if (rx_control & L2CAP_CTRL_POLL)
4121 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
4122
99b0d4b7
GP		 4123 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
4124 del_timer(&pi->retrans_timer);
a2e12a2a
GP		 4125 if (rx_control & L2CAP_CTRL_POLL)
4126 l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL);
99b0d4b7 4127 return;
e072745f 4128 }
99b0d4b7
GP		 4129
4130 if (rx_control & L2CAP_CTRL_POLL)
4131 l2cap_send_srejtail(sk);
4132 else
4133 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
e072745f
GP		 4134}
4135
4136static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
4137{
4138 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
4139
9b16dc65
GP		 4140 if (L2CAP_CTRL_FINAL & rx_control &&
4141 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
e072745f
GP		 4142 del_timer(&l2cap_pi(sk)->monitor_timer);
4143 if (l2cap_pi(sk)->unacked_frames > 0)
4144 __mod_retrans_timer();
4145 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
4146 }
4147
4148 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
4149 case L2CAP_SUPER_RCV_READY:
4150 l2cap_data_channel_rrframe(sk, rx_control);
8f17154f
GP		 4151 break;
4152
e072745f
GP		 4153 case L2CAP_SUPER_REJECT:
4154 l2cap_data_channel_rejframe(sk, rx_control);
4155 break;
2246b2f1 4156
e072745f
GP		 4157 case L2CAP_SUPER_SELECT_REJECT:
4158 l2cap_data_channel_srejframe(sk, rx_control);
4159 break;
4160
4161 case L2CAP_SUPER_RCV_NOT_READY:
4162 l2cap_data_channel_rnrframe(sk, rx_control);
1c2acffb
GP		 4163 break;
4164 }
4165
faaebd19 4166 kfree_skb(skb);
1c2acffb
GP		 4167 return 0;
4168}
4169
1da177e4
LT		 4170static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4171{
4172 struct sock *sk;
6840ed07 4173 struct l2cap_pinfo *pi;
51893f88 4174 u16 control;
f6337c77 4175 u8 tx_seq, req_seq;
51893f88 4176 int len, next_tx_seq_offset, req_seq_offset;
1da177e4
LT		 4177
4178 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
4179 if (!sk) {
4180 BT_DBG("unknown cid 0x%4.4x", cid);
4181 goto drop;
4182 }
4183
6840ed07
GP		 4184 pi = l2cap_pi(sk);
4185
1da177e4
LT		 4186 BT_DBG("sk %p, len %d", sk, skb->len);
4187
4188 if (sk->sk_state != BT_CONNECTED)
4189 goto drop;
4190
6840ed07 4191 switch (pi->mode) {
1c2acffb
GP		 4192 case L2CAP_MODE_BASIC:
4193 /* If socket recv buffers overflows we drop data here
4194 * which is *bad* because L2CAP has to be reliable.
4195 * But we don't have any other choice. L2CAP doesn't
4196 * provide flow control mechanism. */
1da177e4 4197
6840ed07 4198 if (pi->imtu < skb->len)
1c2acffb 4199 goto drop;
1da177e4 4200
1c2acffb
GP		 4201 if (!sock_queue_rcv_skb(sk, skb))
4202 goto done;
4203 break;
4204
4205 case L2CAP_MODE_ERTM:
4206 control = get_unaligned_le16(skb->data);
4207 skb_pull(skb, 2);
c74e560c 4208 len = skb->len;
1c2acffb 4209
26000089
GP		 4210 /*
4211 * We can just drop the corrupted I-frame here.
4212 * Receiver will miss it and start proper recovery
4213 * procedures and ask retransmission.
4214 */
4215 if (l2cap_check_fcs(pi, skb))
4216 goto drop;
4217
bc1b1f8b 4218 if (__is_sar_start(control) && __is_iframe(control))
c74e560c
GP		 4219 len -= 2;
4220
fcc203c3
GP		 4221 if (pi->fcs == L2CAP_FCS_CRC16)
4222 len -= 2;
4223
18778a63 4224 if (len > pi->mps) {
9b108fc0 4225 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
1c2acffb 4226 goto drop;
18778a63 4227 }
1c2acffb 4228
01760bdd
JPRV		 4229 req_seq = __get_reqseq(control);
4230 req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
4231 if (req_seq_offset < 0)
4232 req_seq_offset += 64;
4233
4234 next_tx_seq_offset =
4235 (pi->next_tx_seq - pi->expected_ack_seq) % 64;
4236 if (next_tx_seq_offset < 0)
4237 next_tx_seq_offset += 64;
4238
4239 /* check for invalid req-seq */
4240 if (req_seq_offset > next_tx_seq_offset) {
9b108fc0 4241 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
01760bdd
JPRV		 4242 goto drop;
4243 }
4244
277ffbe3 4245 if (__is_iframe(control)) {
51893f88 4246 if (len < 0) {
9b108fc0 4247 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
277ffbe3 4248 goto drop;
18778a63 4249 }
277ffbe3 4250
fcafde2e 4251 l2cap_data_channel_iframe(sk, control, skb);
277ffbe3 4252 } else {
18778a63 4253 if (len != 0) {
9b108fc0 4254 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
277ffbe3 4255 goto drop;
18778a63 4256 }
277ffbe3 4257
fcafde2e 4258 l2cap_data_channel_sframe(sk, control, skb);
277ffbe3 4259 }
1c2acffb 4260
fcafde2e 4261 goto done;
1c2acffb 4262
6840ed07
GP		 4263 case L2CAP_MODE_STREAMING:
4264 control = get_unaligned_le16(skb->data);
4265 skb_pull(skb, 2);
4266 len = skb->len;
4267
26000089
GP		 4268 if (l2cap_check_fcs(pi, skb))
4269 goto drop;
4270
6840ed07
GP		 4271 if (__is_sar_start(control))
4272 len -= 2;
4273
fcc203c3
GP		 4274 if (pi->fcs == L2CAP_FCS_CRC16)
4275 len -= 2;
4276
51893f88 4277 if (len > pi->mps || len < 0 || __is_sframe(control))
6840ed07
GP		 4278 goto drop;
4279
4280 tx_seq = __get_txseq(control);
4281
4282 if (pi->expected_tx_seq == tx_seq)
4283 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
4284 else
7dffe421 4285 pi->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 4286
18778a63 4287 l2cap_streaming_reassembly_sdu(sk, skb, control);
6840ed07
GP		 4288
4289 goto done;
4290
1c2acffb 4291 default:
e8235c6b 4292 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
1c2acffb
GP		 4293 break;
4294 }
1da177e4
LT		 4295
4296drop:
4297 kfree_skb(skb);
4298
4299done:
0139418c
MH		 4300 if (sk)
4301 bh_unlock_sock(sk);
4302
1da177e4
LT		 4303 return 0;
4304}
4305
8e036fc3 4306static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4
LT		 4307{
4308 struct sock *sk;
4309
4310 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
4311 if (!sk)
4312 goto drop;
4313
4314 BT_DBG("sk %p, len %d", sk, skb->len);
4315
4316 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
4317 goto drop;
4318
4319 if (l2cap_pi(sk)->imtu < skb->len)
4320 goto drop;
4321
4322 if (!sock_queue_rcv_skb(sk, skb))
4323 goto done;
4324
4325drop:
4326 kfree_skb(skb);
4327
4328done:
af05b30b
GP		 4329 if (sk)
4330 bh_unlock_sock(sk);
1da177e4
LT		 4331 return 0;
4332}
4333
4334static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4335{
4336 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4337 u16 cid, len;
4338 __le16 psm;
1da177e4
LT		 4339
4340 skb_pull(skb, L2CAP_HDR_SIZE);
4341 cid = __le16_to_cpu(lh->cid);
4342 len = __le16_to_cpu(lh->len);
4343
1c2acffb
GP		 4344 if (len != skb->len) {
4345 kfree_skb(skb);
4346 return;
4347 }
4348
1da177e4
LT		 4349 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4350
4351 switch (cid) {
8db4dc46 4352 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4353 l2cap_sig_channel(conn, skb);
4354 break;
4355
8db4dc46 4356 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4357 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4358 skb_pull(skb, 2);
4359 l2cap_conless_channel(conn, psm, skb);
4360 break;
4361
4362 default:
4363 l2cap_data_channel(conn, cid, skb);
4364 break;
4365 }
4366}
4367
4368/* ---- L2CAP interface with lower layer (HCI) ---- */
4369
4370static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
4371{
4372 int exact = 0, lm1 = 0, lm2 = 0;
4373 register struct sock *sk;
4374 struct hlist_node *node;
4375
4376 if (type != ACL_LINK)
4377 return 0;
4378
4379 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4380
4381 /* Find listening sockets and check their link_mode */
4382 read_lock(&l2cap_sk_list.lock);
4383 sk_for_each(sk, node, &l2cap_sk_list.head) {
4384 if (sk->sk_state != BT_LISTEN)
4385 continue;
4386
4387 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5
MH		 4388 lm1 |= HCI_LM_ACCEPT;
4389 if (l2cap_pi(sk)->role_switch)
4390 lm1 |= HCI_LM_MASTER;
1da177e4 4391 exact++;
2af6b9d5
MH		 4392 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4393 lm2 |= HCI_LM_ACCEPT;
4394 if (l2cap_pi(sk)->role_switch)
4395 lm2 |= HCI_LM_MASTER;
4396 }
1da177e4
LT		 4397 }
4398 read_unlock(&l2cap_sk_list.lock);
4399
4400 return exact ? lm1 : lm2;
4401}
4402
4403static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
4404{
0139418c
MH		 4405 struct l2cap_conn *conn;
4406
1da177e4
LT		 4407 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4408
4409 if (hcon->type != ACL_LINK)
4410 return 0;
4411
4412 if (!status) {
1da177e4
LT		 4413 conn = l2cap_conn_add(hcon, status);
4414 if (conn)
4415 l2cap_conn_ready(conn);
0139418c 4416 } else
1da177e4
LT		 4417 l2cap_conn_del(hcon, bt_err(status));
4418
4419 return 0;
4420}
4421
2950f21a
MH		 4422static int l2cap_disconn_ind(struct hci_conn *hcon)
4423{
4424 struct l2cap_conn *conn = hcon->l2cap_data;
4425
4426 BT_DBG("hcon %p", hcon);
4427
4428 if (hcon->type != ACL_LINK || !conn)
4429 return 0x13;
4430
4431 return conn->disc_reason;
4432}
4433
4434static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4435{
4436 BT_DBG("hcon %p reason %d", hcon, reason);
4437
4438 if (hcon->type != ACL_LINK)
4439 return 0;
4440
4441 l2cap_conn_del(hcon, bt_err(reason));
0139418c 4442
1da177e4
LT		 4443 return 0;
4444}
4445
f62e4323
MH		 4446static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
4447{
bd3c9e25 4448 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
255c7601
MH		 4449 return;
4450
f62e4323
MH		 4451 if (encrypt == 0x00) {
4452 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
4453 l2cap_sock_clear_timer(sk);
4454 l2cap_sock_set_timer(sk, HZ * 5);
4455 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
4456 __l2cap_sock_close(sk, ECONNREFUSED);
4457 } else {
4458 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
4459 l2cap_sock_clear_timer(sk);
4460 }
4461}
4462
8c1b2355 4463static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4
LT		 4464{
4465 struct l2cap_chan_list *l;
0139418c 4466 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 4467 struct sock *sk;
1da177e4 4468
0139418c 4469 if (!conn)
1da177e4 4470 return 0;
0139418c 4471
1da177e4
LT		 4472 l = &conn->chan_list;
4473
4474 BT_DBG("conn %p", conn);
4475
4476 read_lock(&l->lock);
4477
4478 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
4479 bh_lock_sock(sk);
4480
6a8d3010
MH		 4481 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
4482 bh_unlock_sock(sk);
4483 continue;
4484 }
4485
f62e4323 4486 if (!status && (sk->sk_state == BT_CONNECTED ||
8c1b2355 4487 sk->sk_state == BT_CONFIG)) {
f62e4323 4488 l2cap_check_encryption(sk, encrypt);
9719f8af
MH		 4489 bh_unlock_sock(sk);
4490 continue;
4491 }
4492
b1235d79
MH		 4493 if (sk->sk_state == BT_CONNECT) {
4494 if (!status) {
4495 struct l2cap_conn_req req;
4496 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
4497 req.psm = l2cap_pi(sk)->psm;
1da177e4 4498
b1235d79 4499 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
e501d055 4500 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4 4501
b1235d79
MH		 4502 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4503 L2CAP_CONN_REQ, sizeof(req), &req);
4504 } else {
4505 l2cap_sock_clear_timer(sk);
4506 l2cap_sock_set_timer(sk, HZ / 10);
4507 }
4508 } else if (sk->sk_state == BT_CONNECT2) {
4509 struct l2cap_conn_rsp rsp;
4510 __u16 result;
1da177e4 4511
b1235d79
MH		 4512 if (!status) {
4513 sk->sk_state = BT_CONFIG;
4514 result = L2CAP_CR_SUCCESS;
4515 } else {
4516 sk->sk_state = BT_DISCONN;
4517 l2cap_sock_set_timer(sk, HZ / 10);
4518 result = L2CAP_CR_SEC_BLOCK;
4519 }
4520
4521 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
4522 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
4523 rsp.result = cpu_to_le16(result);
e7c29cb1 4524 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
b1235d79
MH		 4525 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4526 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4527 }
1da177e4
LT		 4528
4529 bh_unlock_sock(sk);
4530 }
4531
4532 read_unlock(&l->lock);
b1235d79 4533
1da177e4
LT		 4534 return 0;
4535}
4536
4537static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4538{
4539 struct l2cap_conn *conn = hcon->l2cap_data;
4540
4541 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4542 goto drop;
4543
4544 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4545
4546 if (flags & ACL_START) {
4547 struct l2cap_hdr *hdr;
4548 int len;
4549
4550 if (conn->rx_len) {
4551 BT_ERR("Unexpected start frame (len %d)", skb->len);
4552 kfree_skb(conn->rx_skb);
4553 conn->rx_skb = NULL;
4554 conn->rx_len = 0;
4555 l2cap_conn_unreliable(conn, ECOMM);
4556 }
4557
4558 if (skb->len < 2) {
4559 BT_ERR("Frame is too short (len %d)", skb->len);
4560 l2cap_conn_unreliable(conn, ECOMM);
4561 goto drop;
4562 }
4563
4564 hdr = (struct l2cap_hdr *) skb->data;
4565 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4566
4567 if (len == skb->len) {
4568 /* Complete frame received */
4569 l2cap_recv_frame(conn, skb);
4570 return 0;
4571 }
4572
4573 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4574
4575 if (skb->len > len) {
4576 BT_ERR("Frame is too long (len %d, expected len %d)",
4577 skb->len, len);
4578 l2cap_conn_unreliable(conn, ECOMM);
4579 goto drop;
4580 }
4581
4582 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4583 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4584 if (!conn->rx_skb)
1da177e4
LT		 4585 goto drop;
4586
d626f62b 4587 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4588 skb->len);
1da177e4
LT		 4589 conn->rx_len = len - skb->len;
4590 } else {
4591 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4592
4593 if (!conn->rx_len) {
4594 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4595 l2cap_conn_unreliable(conn, ECOMM);
4596 goto drop;
4597 }
4598
4599 if (skb->len > conn->rx_len) {
4600 BT_ERR("Fragment is too long (len %d, expected %d)",
4601 skb->len, conn->rx_len);
4602 kfree_skb(conn->rx_skb);
4603 conn->rx_skb = NULL;
4604 conn->rx_len = 0;
4605 l2cap_conn_unreliable(conn, ECOMM);
4606 goto drop;
4607 }
4608
d626f62b 4609 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4610 skb->len);
1da177e4
LT		 4611 conn->rx_len -= skb->len;
4612
4613 if (!conn->rx_len) {
4614 /* Complete frame received */
4615 l2cap_recv_frame(conn, conn->rx_skb);
4616 conn->rx_skb = NULL;
4617 }
4618 }
4619
4620drop:
4621 kfree_skb(skb);
4622 return 0;
4623}
4624
aef7d97c 4625static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4
LT		 4626{
4627 struct sock *sk;
4628 struct hlist_node *node;
1da177e4
LT		 4629
4630 read_lock_bh(&l2cap_sk_list.lock);
4631
be9d1227
MH		 4632 sk_for_each(sk, node, &l2cap_sk_list.head) {
4633 struct l2cap_pinfo *pi = l2cap_pi(sk);
101545f6 4634
aef7d97c
MH		 4635 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4636 batostr(&bt_sk(sk)->src),
4637 batostr(&bt_sk(sk)->dst),
4638 sk->sk_state, __le16_to_cpu(pi->psm),
4639 pi->scid, pi->dcid,
4640 pi->imtu, pi->omtu, pi->sec_level);
be9d1227 4641 }
1da177e4 4642
1da177e4 4643 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 4644
aef7d97c 4645 return 0;
1da177e4
LT		 4646}
4647
aef7d97c
MH		 4648static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4649{
4650 return single_open(file, l2cap_debugfs_show, inode->i_private);
4651}
4652
4653static const struct file_operations l2cap_debugfs_fops = {
4654 .open = l2cap_debugfs_open,
4655 .read = seq_read,
4656 .llseek = seq_lseek,
4657 .release = single_release,
4658};
4659
4660static struct dentry *l2cap_debugfs;
1da177e4 4661
90ddc4f0 4662static const struct proto_ops l2cap_sock_ops = {
1da177e4
LT		 4663 .family = PF_BLUETOOTH,
4664 .owner = THIS_MODULE,
4665 .release = l2cap_sock_release,
4666 .bind = l2cap_sock_bind,
4667 .connect = l2cap_sock_connect,
4668 .listen = l2cap_sock_listen,
4669 .accept = l2cap_sock_accept,
4670 .getname = l2cap_sock_getname,
4671 .sendmsg = l2cap_sock_sendmsg,
f66dc81f 4672 .recvmsg = l2cap_sock_recvmsg,
1da177e4 4673 .poll = bt_sock_poll,
3241ad82 4674 .ioctl = bt_sock_ioctl,
1da177e4
LT		 4675 .mmap = sock_no_mmap,
4676 .socketpair = sock_no_socketpair,
1da177e4
LT		 4677 .shutdown = l2cap_sock_shutdown,
4678 .setsockopt = l2cap_sock_setsockopt,
4679 .getsockopt = l2cap_sock_getsockopt
4680};
4681
ec1b4cf7 4682static const struct net_proto_family l2cap_sock_family_ops = {
1da177e4
LT		 4683 .family = PF_BLUETOOTH,
4684 .owner = THIS_MODULE,
4685 .create = l2cap_sock_create,
4686};
4687
4688static struct hci_proto l2cap_hci_proto = {
4689 .name = "L2CAP",
4690 .id = HCI_PROTO_L2CAP,
4691 .connect_ind = l2cap_connect_ind,
4692 .connect_cfm = l2cap_connect_cfm,
4693 .disconn_ind = l2cap_disconn_ind,
2950f21a 4694 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4695 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4696 .recv_acldata = l2cap_recv_acldata
4697};
4698
4699static int __init l2cap_init(void)
4700{
4701 int err;
be9d1227 4702
1da177e4
LT		 4703 err = proto_register(&l2cap_proto, 0);
4704 if (err < 0)
4705 return err;
4706
1890d36b
GP		 4707 _busy_wq = create_singlethread_workqueue("l2cap");
4708 if (!_busy_wq)
4709 goto error;
4710
1da177e4
LT		 4711 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4712 if (err < 0) {
4713 BT_ERR("L2CAP socket registration failed");
4714 goto error;
4715 }
4716
4717 err = hci_register_proto(&l2cap_hci_proto);
4718 if (err < 0) {
4719 BT_ERR("L2CAP protocol registration failed");
4720 bt_sock_unregister(BTPROTO_L2CAP);
4721 goto error;
4722 }
4723
aef7d97c
MH		 4724 if (bt_debugfs) {
4725 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4726 bt_debugfs, NULL, &l2cap_debugfs_fops);
4727 if (!l2cap_debugfs)
4728 BT_ERR("Failed to create L2CAP debug file");
4729 }
1da177e4
LT		 4730
4731 BT_INFO("L2CAP ver %s", VERSION);
4732 BT_INFO("L2CAP socket layer initialized");
4733
4734 return 0;
4735
4736error:
4737 proto_unregister(&l2cap_proto);
4738 return err;
4739}
4740
4741static void __exit l2cap_exit(void)
4742{
aef7d97c 4743 debugfs_remove(l2cap_debugfs);
1da177e4 4744
1890d36b
GP		 4745 flush_workqueue(_busy_wq);
4746 destroy_workqueue(_busy_wq);
4747
1da177e4
LT		 4748 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4749 BT_ERR("L2CAP socket unregistration failed");
4750
4751 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4752 BT_ERR("L2CAP protocol unregistration failed");
4753
4754 proto_unregister(&l2cap_proto);
4755}
4756
4757void l2cap_load(void)
4758{
4759 /* Dummy function to trigger automatic L2CAP module loading by
4760 * other modules that use L2CAP sockets but don't use any other
4761 * symbols from it. */
1da177e4
LT		 4762}
4763EXPORT_SYMBOL(l2cap_load);
4764
4765module_init(l2cap_init);
4766module_exit(l2cap_exit);
4767
44dd46de
MH		 4768module_param(enable_ertm, bool, 0644);
4769MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
4770
63fbd24e 4771MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 4772MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4773MODULE_VERSION(VERSION);
4774MODULE_LICENSE("GPL");
4775MODULE_ALIAS("bt-proto-0");
kernel source for telekom puls (alcatel/mediatek)