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Bluetooth: Actively send request for Basic 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:
85eb53c6
GP		 2476 if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
2477 pi->mode = l2cap_select_mode(rfc.mode,
2478 pi->conn->feat_mask);
2479 break;
2480 }
2481
22121fc9 2482 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
9b108fc0 2483 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
f2fcfcd6
GP		 2484 break;
2485 default:
2486 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2487 break;
2488 }
2489
2490done:
65c7c491
MH		 2491 switch (pi->mode) {
2492 case L2CAP_MODE_BASIC:
2493 if (pi->imtu != L2CAP_DEFAULT_MTU)
2494 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
62547752
GP		 2495
2496 rfc.mode = L2CAP_MODE_BASIC;
2497 rfc.txwin_size = 0;
2498 rfc.max_transmit = 0;
2499 rfc.retrans_timeout = 0;
2500 rfc.monitor_timeout = 0;
2501 rfc.max_pdu_size = 0;
2502
65c7c491
MH		 2503 break;
2504
2505 case L2CAP_MODE_ERTM:
2506 rfc.mode = L2CAP_MODE_ERTM;
14b5aa71 2507 rfc.txwin_size = pi->tx_win;
68d7f0ce 2508 rfc.max_transmit = pi->max_tx;
f2fcfcd6
GP		 2509 rfc.retrans_timeout = 0;
2510 rfc.monitor_timeout = 0;
c74e560c 2511 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2512 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2513 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
f2fcfcd6 2514
fcc203c3
GP		 2515 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2516 break;
2517
2518 if (pi->fcs == L2CAP_FCS_NONE ||
2519 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2520 pi->fcs = L2CAP_FCS_NONE;
2521 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2522 }
f2fcfcd6
GP		 2523 break;
2524
2525 case L2CAP_MODE_STREAMING:
2526 rfc.mode = L2CAP_MODE_STREAMING;
2527 rfc.txwin_size = 0;
2528 rfc.max_transmit = 0;
2529 rfc.retrans_timeout = 0;
2530 rfc.monitor_timeout = 0;
c74e560c 2531 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091 2532 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
1c762159 2533 rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10);
65c7c491 2534
fcc203c3
GP		 2535 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2536 break;
2537
2538 if (pi->fcs == L2CAP_FCS_NONE ||
2539 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2540 pi->fcs = L2CAP_FCS_NONE;
2541 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2542 }
65c7c491
MH		 2543 break;
2544 }
1da177e4 2545
62547752
GP		 2546 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
2547 (unsigned long) &rfc);
2548
1da177e4
LT		 2549 /* FIXME: Need actual value of the flush timeout */
2550 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2551 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2552
aca3192c
YH		 2553 req->dcid = cpu_to_le16(pi->dcid);
2554 req->flags = cpu_to_le16(0);
1da177e4
LT		 2555
2556 return ptr - data;
2557}
2558
5dee9e7c 2559static int l2cap_parse_conf_req(struct sock *sk, void *data)
1da177e4
LT		 2560{
2561 struct l2cap_pinfo *pi = l2cap_pi(sk);
5dee9e7c
MH		 2562 struct l2cap_conf_rsp *rsp = data;
2563 void *ptr = rsp->data;
2564 void *req = pi->conf_req;
2565 int len = pi->conf_len;
2566 int type, hint, olen;
2567 unsigned long val;
6464f35f 2568 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 2569 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2570 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2571
5dee9e7c 2572 BT_DBG("sk %p", sk);
820ae1b8 2573
5dee9e7c
MH		 2574 while (len >= L2CAP_CONF_OPT_SIZE) {
2575 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2576
589d2746 2577 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2578 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2579
2580 switch (type) {
2581 case L2CAP_CONF_MTU:
861d6882 2582 mtu = val;
5dee9e7c
MH		 2583 break;
2584
2585 case L2CAP_CONF_FLUSH_TO:
2586 pi->flush_to = val;
2587 break;
2588
2589 case L2CAP_CONF_QOS:
2590 break;
2591
6464f35f
MH		 2592 case L2CAP_CONF_RFC:
2593 if (olen == sizeof(rfc))
2594 memcpy(&rfc, (void *) val, olen);
2595 break;
2596
fcc203c3
GP		 2597 case L2CAP_CONF_FCS:
2598 if (val == L2CAP_FCS_NONE)
2599 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2600
2601 break;
2602
5dee9e7c
MH		 2603 default:
2604 if (hint)
2605 break;
2606
2607 result = L2CAP_CONF_UNKNOWN;
2608 *((u8 *) ptr++) = type;
2609 break;
2610 }
2611 }
2612
f2fcfcd6
GP		 2613 if (pi->num_conf_rsp || pi->num_conf_req)
2614 goto done;
2615
2616 switch (pi->mode) {
2617 case L2CAP_MODE_STREAMING:
2618 case L2CAP_MODE_ERTM:
85eb53c6
GP		 2619 if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
2620 pi->mode = l2cap_select_mode(rfc.mode,
2621 pi->conn->feat_mask);
2622 break;
2623 }
2624
742e519b 2625 if (pi->mode != rfc.mode)
f2fcfcd6 2626 return -ECONNREFUSED;
742e519b 2627
f2fcfcd6 2628 break;
f2fcfcd6
GP		 2629 }
2630
2631done:
2632 if (pi->mode != rfc.mode) {
2633 result = L2CAP_CONF_UNACCEPT;
2634 rfc.mode = pi->mode;
2635
2636 if (pi->num_conf_rsp == 1)
2637 return -ECONNREFUSED;
2638
2639 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2640 sizeof(rfc), (unsigned long) &rfc);
2641 }
2642
2643
5dee9e7c
MH		 2644 if (result == L2CAP_CONF_SUCCESS) {
2645 /* Configure output options and let the other side know
2646 * which ones we don't like. */
2647
f2fcfcd6
GP		 2648 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2649 result = L2CAP_CONF_UNACCEPT;
2650 else {
2651 pi->omtu = mtu;
2652 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2653 }
2654 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
6464f35f 2655
f2fcfcd6
GP		 2656 switch (rfc.mode) {
2657 case L2CAP_MODE_BASIC:
2658 pi->fcs = L2CAP_FCS_NONE;
2659 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2660 break;
2661
2662 case L2CAP_MODE_ERTM:
2663 pi->remote_tx_win = rfc.txwin_size;
2664 pi->remote_max_tx = rfc.max_transmit;
1c762159
GP		 2665 if (rfc.max_pdu_size > pi->conn->mtu - 10)
2666 rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
2667
2668 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6 2669
10467e9e
GP		 2670 rfc.retrans_timeout =
2671 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
2672 rfc.monitor_timeout =
2673 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
f2fcfcd6
GP		 2674
2675 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2676
2677 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2678 sizeof(rfc), (unsigned long) &rfc);
2679
f2fcfcd6
GP		 2680 break;
2681
2682 case L2CAP_MODE_STREAMING:
1c762159
GP		 2683 if (rfc.max_pdu_size > pi->conn->mtu - 10)
2684 rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10);
2685
2686 pi->remote_mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2687
2688 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2689
2690 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2691 sizeof(rfc), (unsigned long) &rfc);
2692
f2fcfcd6
GP		 2693 break;
2694
2695 default:
5dee9e7c 2696 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2697
6464f35f 2698 memset(&rfc, 0, sizeof(rfc));
f2fcfcd6
GP		 2699 rfc.mode = pi->mode;
2700 }
6464f35f 2701
f2fcfcd6
GP		 2702 if (result == L2CAP_CONF_SUCCESS)
2703 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2704 }
5dee9e7c
MH		 2705 rsp->scid = cpu_to_le16(pi->dcid);
2706 rsp->result = cpu_to_le16(result);
2707 rsp->flags = cpu_to_le16(0x0000);
2708
2709 return ptr - data;
1da177e4
LT		 2710}
2711
f2fcfcd6
GP		 2712static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2713{
2714 struct l2cap_pinfo *pi = l2cap_pi(sk);
2715 struct l2cap_conf_req *req = data;
2716 void *ptr = req->data;
2717 int type, olen;
2718 unsigned long val;
2719 struct l2cap_conf_rfc rfc;
2720
2721 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2722
2723 while (len >= L2CAP_CONF_OPT_SIZE) {
2724 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2725
2726 switch (type) {
2727 case L2CAP_CONF_MTU:
2728 if (val < L2CAP_DEFAULT_MIN_MTU) {
2729 *result = L2CAP_CONF_UNACCEPT;
2730 pi->omtu = L2CAP_DEFAULT_MIN_MTU;
2731 } else
2732 pi->omtu = val;
2733 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2734 break;
2735
2736 case L2CAP_CONF_FLUSH_TO:
2737 pi->flush_to = val;
2738 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2739 2, pi->flush_to);
2740 break;
2741
2742 case L2CAP_CONF_RFC:
2743 if (olen == sizeof(rfc))
2744 memcpy(&rfc, (void *)val, olen);
2745
2746 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2747 rfc.mode != pi->mode)
2748 return -ECONNREFUSED;
2749
2750 pi->mode = rfc.mode;
2751 pi->fcs = 0;
2752
2753 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2754 sizeof(rfc), (unsigned long) &rfc);
2755 break;
2756 }
2757 }
2758
2759 if (*result == L2CAP_CONF_SUCCESS) {
2760 switch (rfc.mode) {
2761 case L2CAP_MODE_ERTM:
2762 pi->remote_tx_win = rfc.txwin_size;
10467e9e
GP		 2763 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2764 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
1c762159 2765 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2766 break;
2767 case L2CAP_MODE_STREAMING:
1c762159 2768 pi->mps = le16_to_cpu(rfc.max_pdu_size);
f2fcfcd6
GP		 2769 }
2770 }
2771
2772 req->dcid = cpu_to_le16(pi->dcid);
2773 req->flags = cpu_to_le16(0x0000);
2774
2775 return ptr - data;
2776}
2777
5dee9e7c 2778static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1da177e4
LT		 2779{
2780 struct l2cap_conf_rsp *rsp = data;
2781 void *ptr = rsp->data;
1da177e4 2782
5dee9e7c 2783 BT_DBG("sk %p", sk);
1da177e4 2784
aca3192c 2785 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
5dee9e7c 2786 rsp->result = cpu_to_le16(result);
aca3192c 2787 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2788
2789 return ptr - data;
2790}
2791
7b1c0049
GP		 2792static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len)
2793{
2794 struct l2cap_pinfo *pi = l2cap_pi(sk);
2795 int type, olen;
2796 unsigned long val;
2797 struct l2cap_conf_rfc rfc;
2798
2799 BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len);
2800
2801 if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING))
2802 return;
2803
2804 while (len >= L2CAP_CONF_OPT_SIZE) {
2805 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2806
2807 switch (type) {
2808 case L2CAP_CONF_RFC:
2809 if (olen == sizeof(rfc))
2810 memcpy(&rfc, (void *)val, olen);
2811 goto done;
2812 }
2813 }
2814
2815done:
2816 switch (rfc.mode) {
2817 case L2CAP_MODE_ERTM:
2818 pi->remote_tx_win = rfc.txwin_size;
10467e9e
GP		 2819 pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2820 pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
7b1c0049
GP		 2821 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2822 break;
2823 case L2CAP_MODE_STREAMING:
2824 pi->mps = le16_to_cpu(rfc.max_pdu_size);
2825 }
2826}
2827
4e8402a3
MH		 2828static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2829{
2830 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2831
2832 if (rej->reason != 0x0000)
2833 return 0;
2834
2835 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2836 cmd->ident == conn->info_ident) {
4e8402a3 2837 del_timer(&conn->info_timer);
984947dc
MH		 2838
2839 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2840 conn->info_ident = 0;
984947dc 2841
4e8402a3
MH		 2842 l2cap_conn_start(conn);
2843 }
2844
2845 return 0;
2846}
2847
1da177e4
LT		 2848static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2849{
2850 struct l2cap_chan_list *list = &conn->chan_list;
2851 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2852 struct l2cap_conn_rsp rsp;
2853 struct sock *sk, *parent;
e7c29cb1 2854 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2855
2856 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2857 __le16 psm = req->psm;
1da177e4
LT		 2858
2859 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2860
2861 /* Check if we have socket listening on psm */
2862 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2863 if (!parent) {
2864 result = L2CAP_CR_BAD_PSM;
2865 goto sendresp;
2866 }
2867
e7c29cb1
MH		 2868 /* Check if the ACL is secure enough (if not SDP) */
2869 if (psm != cpu_to_le16(0x0001) &&
2870 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2871 conn->disc_reason = 0x05;
e7c29cb1
MH		 2872 result = L2CAP_CR_SEC_BLOCK;
2873 goto response;
2874 }
2875
1da177e4
LT		 2876 result = L2CAP_CR_NO_MEM;
2877
2878 /* Check for backlog size */
2879 if (sk_acceptq_is_full(parent)) {
8e87d142 2880 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2881 goto response;
2882 }
2883
3b1e0a65 2884 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1da177e4
LT		 2885 if (!sk)
2886 goto response;
2887
fd1278d7 2888 write_lock_bh(&list->lock);
1da177e4
LT		 2889
2890 /* Check if we already have channel with that dcid */
2891 if (__l2cap_get_chan_by_dcid(list, scid)) {
fd1278d7 2892 write_unlock_bh(&list->lock);
1da177e4
LT		 2893 sock_set_flag(sk, SOCK_ZAPPED);
2894 l2cap_sock_kill(sk);
2895 goto response;
2896 }
2897
2898 hci_conn_hold(conn->hcon);
2899
2900 l2cap_sock_init(sk, parent);
2901 bacpy(&bt_sk(sk)->src, conn->src);
2902 bacpy(&bt_sk(sk)->dst, conn->dst);
2903 l2cap_pi(sk)->psm = psm;
2904 l2cap_pi(sk)->dcid = scid;
2905
2906 __l2cap_chan_add(conn, sk, parent);
2907 dcid = l2cap_pi(sk)->scid;
2908
2909 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2910
1da177e4
LT		 2911 l2cap_pi(sk)->ident = cmd->ident;
2912
984947dc 2913 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2af6b9d5 2914 if (l2cap_check_security(sk)) {
f66dc81f
MH		 2915 if (bt_sk(sk)->defer_setup) {
2916 sk->sk_state = BT_CONNECT2;
2917 result = L2CAP_CR_PEND;
2918 status = L2CAP_CS_AUTHOR_PEND;
2919 parent->sk_data_ready(parent, 0);
2920 } else {
2921 sk->sk_state = BT_CONFIG;
2922 result = L2CAP_CR_SUCCESS;
2923 status = L2CAP_CS_NO_INFO;
2924 }
79d554a6
MH		 2925 } else {
2926 sk->sk_state = BT_CONNECT2;
2927 result = L2CAP_CR_PEND;
2928 status = L2CAP_CS_AUTHEN_PEND;
2929 }
2930 } else {
2931 sk->sk_state = BT_CONNECT2;
2932 result = L2CAP_CR_PEND;
2933 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2934 }
2935
fd1278d7 2936 write_unlock_bh(&list->lock);
1da177e4
LT		 2937
2938response:
2939 bh_unlock_sock(parent);
2940
2941sendresp:
aca3192c
YH		 2942 rsp.scid = cpu_to_le16(scid);
2943 rsp.dcid = cpu_to_le16(dcid);
2944 rsp.result = cpu_to_le16(result);
2945 rsp.status = cpu_to_le16(status);
1da177e4 2946 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2947
2948 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2949 struct l2cap_info_req info;
2950 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2951
2952 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2953 conn->info_ident = l2cap_get_ident(conn);
2954
2955 mod_timer(&conn->info_timer, jiffies +
2956 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2957
2958 l2cap_send_cmd(conn, conn->info_ident,
2959 L2CAP_INFO_REQ, sizeof(info), &info);
2960 }
2961
1da177e4
LT		 2962 return 0;
2963}
2964
2965static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2966{
2967 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2968 u16 scid, dcid, result, status;
2969 struct sock *sk;
2970 u8 req[128];
2971
2972 scid = __le16_to_cpu(rsp->scid);
2973 dcid = __le16_to_cpu(rsp->dcid);
2974 result = __le16_to_cpu(rsp->result);
2975 status = __le16_to_cpu(rsp->status);
2976
2977 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2978
2979 if (scid) {
af05b30b
GP		 2980 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2981 if (!sk)
1da177e4
LT		 2982 return 0;
2983 } else {
af05b30b
GP		 2984 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
2985 if (!sk)
1da177e4
LT		 2986 return 0;
2987 }
2988
2989 switch (result) {
2990 case L2CAP_CR_SUCCESS:
2991 sk->sk_state = BT_CONFIG;
2992 l2cap_pi(sk)->ident = 0;
2993 l2cap_pi(sk)->dcid = dcid;
2994 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
6a8d3010
MH		 2995 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
2996
1da177e4
LT		 2997 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2998 l2cap_build_conf_req(sk, req), req);
f2fcfcd6 2999 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3000 break;
3001
3002 case L2CAP_CR_PEND:
6a8d3010 3003 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 3004 break;
3005
3006 default:
3007 l2cap_chan_del(sk, ECONNREFUSED);
3008 break;
3009 }
3010
3011 bh_unlock_sock(sk);
3012 return 0;
3013}
3014
88219a0f 3015static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 3016{
3017 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3018 u16 dcid, flags;
3019 u8 rsp[64];
3020 struct sock *sk;
5dee9e7c 3021 int len;
1da177e4
LT		 3022
3023 dcid = __le16_to_cpu(req->dcid);
3024 flags = __le16_to_cpu(req->flags);
3025
3026 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3027
af05b30b
GP		 3028 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3029 if (!sk)
1da177e4
LT		 3030 return -ENOENT;
3031
354f60a9
MH		 3032 if (sk->sk_state == BT_DISCONN)
3033 goto unlock;
3034
5dee9e7c 3035 /* Reject if config buffer is too small. */
88219a0f 3036 len = cmd_len - sizeof(*req);
5dee9e7c
MH		 3037 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
3038 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3039 l2cap_build_conf_rsp(sk, rsp,
3040 L2CAP_CONF_REJECT, flags), rsp);
3041 goto unlock;
3042 }
3043
3044 /* Store config. */
3045 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
3046 l2cap_pi(sk)->conf_len += len;
1da177e4
LT		 3047
3048 if (flags & 0x0001) {
3049 /* Incomplete config. Send empty response. */
3050 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
5dee9e7c
MH		 3051 l2cap_build_conf_rsp(sk, rsp,
3052 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 3053 goto unlock;
3054 }
3055
3056 /* Complete config. */
5dee9e7c 3057 len = l2cap_parse_conf_req(sk, rsp);
f2fcfcd6 3058 if (len < 0) {
9b108fc0 3059 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4 3060 goto unlock;
f2fcfcd6 3061 }
1da177e4 3062
5dee9e7c 3063 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
f2fcfcd6 3064 l2cap_pi(sk)->num_conf_rsp++;
5dee9e7c 3065
5dee9e7c
MH		 3066 /* Reset config buffer. */
3067 l2cap_pi(sk)->conf_len = 0;
3068
876d9484
MH		 3069 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
3070 goto unlock;
3071
1da177e4 3072 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
f64f9e71
JP		 3073 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
3074 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 3075 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
3076
1da177e4 3077 sk->sk_state = BT_CONNECTED;
e90bac06 3078
0565c1c2
GP		 3079 l2cap_pi(sk)->next_tx_seq = 0;
3080 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3081 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3082 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3083 l2cap_ertm_init(sk);
3084
1da177e4 3085 l2cap_chan_ready(sk);
876d9484
MH		 3086 goto unlock;
3087 }
3088
3089 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 3090 u8 buf[64];
1da177e4 3091 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
79d554a6 3092 l2cap_build_conf_req(sk, buf), buf);
f2fcfcd6 3093 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 3094 }
3095
3096unlock:
3097 bh_unlock_sock(sk);
3098 return 0;
3099}
3100
3101static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3102{
3103 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
3104 u16 scid, flags, result;
3105 struct sock *sk;
7b1c0049 3106 int len = cmd->len - sizeof(*rsp);
1da177e4
LT		 3107
3108 scid = __le16_to_cpu(rsp->scid);
3109 flags = __le16_to_cpu(rsp->flags);
3110 result = __le16_to_cpu(rsp->result);
3111
af05b30b
GP		 3112 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
3113 scid, flags, result);
1da177e4 3114
af05b30b
GP		 3115 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3116 if (!sk)
1da177e4
LT		 3117 return 0;
3118
3119 switch (result) {
3120 case L2CAP_CONF_SUCCESS:
7b1c0049 3121 l2cap_conf_rfc_get(sk, rsp->data, len);
1da177e4
LT		 3122 break;
3123
3124 case L2CAP_CONF_UNACCEPT:
f2fcfcd6 3125 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
f2fcfcd6
GP		 3126 char req[64];
3127
c2c77ec8 3128 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
9b108fc0 3129 l2cap_send_disconn_req(conn, sk, ECONNRESET);
c2c77ec8
AE		 3130 goto done;
3131 }
3132
f2fcfcd6
GP		 3133 /* throw out any old stored conf requests */
3134 result = L2CAP_CONF_SUCCESS;
3135 len = l2cap_parse_conf_rsp(sk, rsp->data,
3136 len, req, &result);
3137 if (len < 0) {
9b108fc0 3138 l2cap_send_disconn_req(conn, sk, ECONNRESET);
f2fcfcd6
GP		 3139 goto done;
3140 }
3141
3142 l2cap_send_cmd(conn, l2cap_get_ident(conn),
3143 L2CAP_CONF_REQ, len, req);
3144 l2cap_pi(sk)->num_conf_req++;
3145 if (result != L2CAP_CONF_SUCCESS)
3146 goto done;
3147 break;
1da177e4
LT		 3148 }
3149
8e87d142 3150 default:
b1235d79 3151 sk->sk_err = ECONNRESET;
1da177e4 3152 l2cap_sock_set_timer(sk, HZ * 5);
9b108fc0 3153 l2cap_send_disconn_req(conn, sk, ECONNRESET);
1da177e4
LT		 3154 goto done;
3155 }
3156
3157 if (flags & 0x01)
3158 goto done;
3159
1da177e4
LT		 3160 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
3161
3162 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
f64f9e71
JP		 3163 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
3164 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 3165 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
3166
1da177e4 3167 sk->sk_state = BT_CONNECTED;
0565c1c2 3168 l2cap_pi(sk)->next_tx_seq = 0;
1c2acffb 3169 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 3170 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 3171 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
3172 l2cap_ertm_init(sk);
3173
1da177e4
LT		 3174 l2cap_chan_ready(sk);
3175 }
3176
3177done:
3178 bh_unlock_sock(sk);
3179 return 0;
3180}
3181
3182static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3183{
3184 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
3185 struct l2cap_disconn_rsp rsp;
3186 u16 dcid, scid;
3187 struct sock *sk;
3188
3189 scid = __le16_to_cpu(req->scid);
3190 dcid = __le16_to_cpu(req->dcid);
3191
3192 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
3193
af05b30b
GP		 3194 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
3195 if (!sk)
1da177e4
LT		 3196 return 0;
3197
aca3192c
YH		 3198 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3199 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1da177e4
LT		 3200 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
3201
3202 sk->sk_shutdown = SHUTDOWN_MASK;
3203
3204 l2cap_chan_del(sk, ECONNRESET);
3205 bh_unlock_sock(sk);
3206
3207 l2cap_sock_kill(sk);
3208 return 0;
3209}
3210
3211static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3212{
3213 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3214 u16 dcid, scid;
3215 struct sock *sk;
3216
3217 scid = __le16_to_cpu(rsp->scid);
3218 dcid = __le16_to_cpu(rsp->dcid);
3219
3220 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3221
af05b30b
GP		 3222 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3223 if (!sk)
1da177e4
LT		 3224 return 0;
3225
3226 l2cap_chan_del(sk, 0);
3227 bh_unlock_sock(sk);
3228
3229 l2cap_sock_kill(sk);
3230 return 0;
3231}
3232
3233static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3234{
3235 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3236 u16 type;
3237
3238 type = __le16_to_cpu(req->type);
3239
3240 BT_DBG("type 0x%4.4x", type);
3241
f0709e03
MH		 3242 if (type == L2CAP_IT_FEAT_MASK) {
3243 u8 buf[8];
44dd46de 3244 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3245 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3246 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3247 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
44dd46de 3248 if (enable_ertm)
fcc203c3
GP		 3249 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3250 | L2CAP_FEAT_FCS;
1b7bf4ed 3251 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3252 l2cap_send_cmd(conn, cmd->ident,
3253 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3254 } else if (type == L2CAP_IT_FIXED_CHAN) {
3255 u8 buf[12];
3256 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3257 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3258 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3259 memcpy(buf + 4, l2cap_fixed_chan, 8);
3260 l2cap_send_cmd(conn, cmd->ident,
3261 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3262 } else {
3263 struct l2cap_info_rsp rsp;
3264 rsp.type = cpu_to_le16(type);
3265 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3266 l2cap_send_cmd(conn, cmd->ident,
3267 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3268 }
1da177e4
LT		 3269
3270 return 0;
3271}
3272
3273static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3274{
3275 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3276 u16 type, result;
3277
3278 type = __le16_to_cpu(rsp->type);
3279 result = __le16_to_cpu(rsp->result);
3280
3281 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3282
4e8402a3
MH		 3283 del_timer(&conn->info_timer);
3284
984947dc 3285 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3286 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3287
47ec1dcd 3288 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3289 struct l2cap_info_req req;
3290 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3291
3292 conn->info_ident = l2cap_get_ident(conn);
3293
3294 l2cap_send_cmd(conn, conn->info_ident,
3295 L2CAP_INFO_REQ, sizeof(req), &req);
3296 } else {
3297 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3298 conn->info_ident = 0;
3299
3300 l2cap_conn_start(conn);
3301 }
3302 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3303 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3304 conn->info_ident = 0;
984947dc
MH		 3305
3306 l2cap_conn_start(conn);
3307 }
4e8402a3 3308
1da177e4
LT		 3309 return 0;
3310}
3311
3312static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3313{
3314 u8 *data = skb->data;
3315 int len = skb->len;
3316 struct l2cap_cmd_hdr cmd;
3317 int err = 0;
3318
3319 l2cap_raw_recv(conn, skb);
3320
3321 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3322 u16 cmd_len;
1da177e4
LT		 3323 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3324 data += L2CAP_CMD_HDR_SIZE;
3325 len -= L2CAP_CMD_HDR_SIZE;
3326
88219a0f 3327 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3328
88219a0f 3329 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3330
88219a0f 3331 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3332 BT_DBG("corrupted command");
3333 break;
3334 }
3335
3336 switch (cmd.code) {
3337 case L2CAP_COMMAND_REJ:
4e8402a3 3338 l2cap_command_rej(conn, &cmd, data);
1da177e4
LT		 3339 break;
3340
3341 case L2CAP_CONN_REQ:
3342 err = l2cap_connect_req(conn, &cmd, data);
3343 break;
3344
3345 case L2CAP_CONN_RSP:
3346 err = l2cap_connect_rsp(conn, &cmd, data);
3347 break;
3348
3349 case L2CAP_CONF_REQ:
88219a0f 3350 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1da177e4
LT		 3351 break;
3352
3353 case L2CAP_CONF_RSP:
3354 err = l2cap_config_rsp(conn, &cmd, data);
3355 break;
3356
3357 case L2CAP_DISCONN_REQ:
3358 err = l2cap_disconnect_req(conn, &cmd, data);
3359 break;
3360
3361 case L2CAP_DISCONN_RSP:
3362 err = l2cap_disconnect_rsp(conn, &cmd, data);
3363 break;
3364
3365 case L2CAP_ECHO_REQ:
88219a0f 3366 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1da177e4
LT		 3367 break;
3368
3369 case L2CAP_ECHO_RSP:
3370 break;
3371
3372 case L2CAP_INFO_REQ:
3373 err = l2cap_information_req(conn, &cmd, data);
3374 break;
3375
3376 case L2CAP_INFO_RSP:
3377 err = l2cap_information_rsp(conn, &cmd, data);
3378 break;
3379
3380 default:
3381 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3382 err = -EINVAL;
3383 break;
3384 }
3385
3386 if (err) {
3387 struct l2cap_cmd_rej rej;
3388 BT_DBG("error %d", err);
3389
3390 /* FIXME: Map err to a valid reason */
aca3192c 3391 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3392 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3393 }
3394
88219a0f
AV		 3395 data += cmd_len;
3396 len -= cmd_len;
1da177e4
LT		 3397 }
3398
3399 kfree_skb(skb);
3400}
3401
fcc203c3
GP		 3402static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3403{
3404 u16 our_fcs, rcv_fcs;
3405 int hdr_size = L2CAP_HDR_SIZE + 2;
3406
3407 if (pi->fcs == L2CAP_FCS_CRC16) {
3408 skb_trim(skb, skb->len - 2);
3409 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3410 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3411
3412 if (our_fcs != rcv_fcs)
3413 return -EINVAL;
3414 }
3415 return 0;
3416}
3417
d5392c8f
GP		 3418static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3419{
3420 struct l2cap_pinfo *pi = l2cap_pi(sk);
3421 u16 control = 0;
3422
3423 pi->frames_sent = 0;
d5392c8f
GP		 3424
3425 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3426
3427 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
64988868 3428 control |= L2CAP_SUPER_RCV_NOT_READY;
d5392c8f 3429 l2cap_send_sframe(pi, control);
1890d36b 3430 pi->conn_state |= L2CAP_CONN_RNR_SENT;
d5392c8f
GP		 3431 }
3432
4ea727ef
GP		 3433 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY)
3434 l2cap_retransmit_frames(sk);
d5392c8f 3435
dfc909be 3436 spin_lock_bh(&pi->send_lock);
d5392c8f 3437 l2cap_ertm_send(sk);
dfc909be 3438 spin_unlock_bh(&pi->send_lock);
d5392c8f
GP		 3439
3440 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3441 pi->frames_sent == 0) {
3442 control |= L2CAP_SUPER_RCV_READY;
d5392c8f
GP		 3443 l2cap_send_sframe(pi, control);
3444 }
3445}
3446
9b53350d 3447static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
8f17154f
GP		 3448{
3449 struct sk_buff *next_skb;
bfbacc11
JPRV		 3450 struct l2cap_pinfo *pi = l2cap_pi(sk);
3451 int tx_seq_offset, next_tx_seq_offset;
8f17154f
GP		 3452
3453 bt_cb(skb)->tx_seq = tx_seq;
3454 bt_cb(skb)->sar = sar;
3455
3456 next_skb = skb_peek(SREJ_QUEUE(sk));
3457 if (!next_skb) {
3458 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d 3459 return 0;
8f17154f
GP		 3460 }
3461
bfbacc11
JPRV		 3462 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3463 if (tx_seq_offset < 0)
3464 tx_seq_offset += 64;
3465
8f17154f 3466 do {
9b53350d
JPRV		 3467 if (bt_cb(next_skb)->tx_seq == tx_seq)
3468 return -EINVAL;
3469
bfbacc11
JPRV		 3470 next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
3471 pi->buffer_seq) % 64;
3472 if (next_tx_seq_offset < 0)
3473 next_tx_seq_offset += 64;
3474
3475 if (next_tx_seq_offset > tx_seq_offset) {
8f17154f 3476 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
9b53350d 3477 return 0;
8f17154f
GP		 3478 }
3479
3480 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3481 break;
3482
59203a21 3483 } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
8f17154f
GP		 3484
3485 __skb_queue_tail(SREJ_QUEUE(sk), skb);
9b53350d
JPRV		 3486
3487 return 0;
8f17154f
GP		 3488}
3489
18778a63
GP		 3490static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3491{
3492 struct l2cap_pinfo *pi = l2cap_pi(sk);
3493 struct sk_buff *_skb;
1890d36b 3494 int err;
18778a63
GP		 3495
3496 switch (control & L2CAP_CTRL_SAR) {
3497 case L2CAP_SDU_UNSEGMENTED:
3498 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3499 goto drop;
3500
3501 err = sock_queue_rcv_skb(sk, skb);
3502 if (!err)
3503 return err;
3504
3505 break;
3506
3507 case L2CAP_SDU_START:
3508 if (pi->conn_state & L2CAP_CONN_SAR_SDU)
3509 goto drop;
3510
3511 pi->sdu_len = get_unaligned_le16(skb->data);
18778a63
GP		 3512
3513 if (pi->sdu_len > pi->imtu)
3514 goto disconnect;
3515
3516 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
1890d36b
GP		 3517 if (!pi->sdu)
3518 return -ENOMEM;
3519
3520 /* pull sdu_len bytes only after alloc, because of Local Busy
3521 * condition we have to be sure that this will be executed
3522 * only once, i.e., when alloc does not fail */
3523 skb_pull(skb, 2);
18778a63
GP		 3524
3525 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3526
3527 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3528 pi->partial_sdu_len = skb->len;
3529 break;
3530
3531 case L2CAP_SDU_CONTINUE:
3532 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3533 goto disconnect;
3534
3535 if (!pi->sdu)
3536 goto disconnect;
3537
18778a63
GP		 3538 pi->partial_sdu_len += skb->len;
3539 if (pi->partial_sdu_len > pi->sdu_len)
3540 goto drop;
3541
4178ba46
GP		 3542 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3543
18778a63
GP		 3544 break;
3545
3546 case L2CAP_SDU_END:
3547 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3548 goto disconnect;
3549
3550 if (!pi->sdu)
3551 goto disconnect;
3552
1890d36b 3553 if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) {
1890d36b 3554 pi->partial_sdu_len += skb->len;
18778a63 3555
1890d36b
GP		 3556 if (pi->partial_sdu_len > pi->imtu)
3557 goto drop;
18778a63 3558
1890d36b
GP		 3559 if (pi->partial_sdu_len != pi->sdu_len)
3560 goto drop;
4178ba46
GP		 3561
3562 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
1890d36b 3563 }
18778a63
GP		 3564
3565 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
1890d36b
GP		 3566 if (!_skb) {
3567 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3568 return -ENOMEM;
3569 }
3570
18778a63 3571 err = sock_queue_rcv_skb(sk, _skb);
1890d36b 3572 if (err < 0) {
18778a63 3573 kfree_skb(_skb);
1890d36b
GP		 3574 pi->conn_state |= L2CAP_CONN_SAR_RETRY;
3575 return err;
3576 }
3577
3578 pi->conn_state &= ~L2CAP_CONN_SAR_RETRY;
3579 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
18778a63
GP		 3580
3581 kfree_skb(pi->sdu);
3582 break;
3583 }
3584
3585 kfree_skb(skb);
1890d36b 3586 return 0;
18778a63
GP		 3587
3588drop:
3589 kfree_skb(pi->sdu);
3590 pi->sdu = NULL;
3591
3592disconnect:
9b108fc0 3593 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
18778a63
GP		 3594 kfree_skb(skb);
3595 return 0;
3596}
3597
1890d36b
GP		 3598static void l2cap_busy_work(struct work_struct *work)
3599{
3600 DECLARE_WAITQUEUE(wait, current);
3601 struct l2cap_pinfo *pi =
3602 container_of(work, struct l2cap_pinfo, busy_work);
3603 struct sock *sk = (struct sock *)pi;
3604 int n_tries = 0, timeo = HZ/5, err;
3605 struct sk_buff *skb;
3606 u16 control;
3607
3608 lock_sock(sk);
3609
2b0b05dd 3610 add_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3611 while ((skb = skb_peek(BUSY_QUEUE(sk)))) {
3612 set_current_state(TASK_INTERRUPTIBLE);
3613
3614 if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
3615 err = -EBUSY;
9b108fc0 3616 l2cap_send_disconn_req(pi->conn, sk, EBUSY);
1890d36b
GP		 3617 goto done;
3618 }
3619
3620 if (!timeo)
3621 timeo = HZ/5;
3622
3623 if (signal_pending(current)) {
3624 err = sock_intr_errno(timeo);
3625 goto done;
3626 }
3627
3628 release_sock(sk);
3629 timeo = schedule_timeout(timeo);
3630 lock_sock(sk);
3631
3632 err = sock_error(sk);
3633 if (err)
3634 goto done;
3635
3636 while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) {
3637 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3638 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3639 if (err < 0) {
3640 skb_queue_head(BUSY_QUEUE(sk), skb);
3641 break;
3642 }
3643
3644 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3645 }
3646
3647 if (!skb)
3648 break;
3649 }
3650
3651 if (!(pi->conn_state & L2CAP_CONN_RNR_SENT))
3652 goto done;
3653
3654 control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3655 control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
3656 l2cap_send_sframe(pi, control);
3657 l2cap_pi(sk)->retry_count = 1;
3658
3659 del_timer(&pi->retrans_timer);
3660 __mod_monitor_timer();
3661
3662 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
3663
3664done:
3665 pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
3666 pi->conn_state &= ~L2CAP_CONN_RNR_SENT;
3667
0e98958d
GP		 3668 BT_DBG("sk %p, Exit local busy", sk);
3669
1890d36b 3670 set_current_state(TASK_RUNNING);
2b0b05dd 3671 remove_wait_queue(sk_sleep(sk), &wait);
1890d36b
GP		 3672
3673 release_sock(sk);
3674}
3675
3676static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control)
3677{
3678 struct l2cap_pinfo *pi = l2cap_pi(sk);
3679 int sctrl, err;
3680
3681 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3682 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3683 __skb_queue_tail(BUSY_QUEUE(sk), skb);
3684 return -EBUSY;
3685 }
3686
3687 err = l2cap_ertm_reassembly_sdu(sk, skb, control);
3688 if (err >= 0) {
3689 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3690 return err;
3691 }
3692
3693 /* Busy Condition */
0e98958d
GP		 3694 BT_DBG("sk %p, Enter local busy", sk);
3695
1890d36b
GP		 3696 pi->conn_state |= L2CAP_CONN_LOCAL_BUSY;
3697 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3698 __skb_queue_tail(BUSY_QUEUE(sk), skb);
3699
3700 sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3701 sctrl |= L2CAP_SUPER_RCV_NOT_READY;
3702 l2cap_send_sframe(pi, sctrl);
3703
3704 pi->conn_state |= L2CAP_CONN_RNR_SENT;
3705
7fe9b298
GP		 3706 del_timer(&pi->ack_timer);
3707
1890d36b
GP		 3708 queue_work(_busy_wq, &pi->busy_work);
3709
3710 return err;
3711}
3712
18778a63 3713static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
c74e560c
GP		 3714{
3715 struct l2cap_pinfo *pi = l2cap_pi(sk);
3716 struct sk_buff *_skb;
3717 int err = -EINVAL;
3718
18778a63
GP		 3719 /*
3720 * TODO: We have to notify the userland if some data is lost with the
3721 * Streaming Mode.
3722 */
3723
c74e560c
GP		 3724 switch (control & L2CAP_CTRL_SAR) {
3725 case L2CAP_SDU_UNSEGMENTED:
3726 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3727 kfree_skb(pi->sdu);
3728 break;
3729 }
3730
3731 err = sock_queue_rcv_skb(sk, skb);
3732 if (!err)
3733 return 0;
3734
3735 break;
3736
3737 case L2CAP_SDU_START:
3738 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3739 kfree_skb(pi->sdu);
3740 break;
3741 }
3742
3743 pi->sdu_len = get_unaligned_le16(skb->data);
3744 skb_pull(skb, 2);
3745
052897ca
GP		 3746 if (pi->sdu_len > pi->imtu) {
3747 err = -EMSGSIZE;
3748 break;
3749 }
3750
c74e560c
GP		 3751 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3752 if (!pi->sdu) {
3753 err = -ENOMEM;
3754 break;
3755 }
3756
3757 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3758
3759 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3760 pi->partial_sdu_len = skb->len;
3761 err = 0;
3762 break;
3763
3764 case L2CAP_SDU_CONTINUE:
3765 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3766 break;
3767
3768 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3769
3770 pi->partial_sdu_len += skb->len;
3771 if (pi->partial_sdu_len > pi->sdu_len)
3772 kfree_skb(pi->sdu);
3773 else
3774 err = 0;
3775
3776 break;
3777
3778 case L2CAP_SDU_END:
3779 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3780 break;
3781
3782 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3783
3784 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3785 pi->partial_sdu_len += skb->len;
3786
36f2fd58
GP		 3787 if (pi->partial_sdu_len > pi->imtu)
3788 goto drop;
3789
c74e560c
GP		 3790 if (pi->partial_sdu_len == pi->sdu_len) {
3791 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3792 err = sock_queue_rcv_skb(sk, _skb);
3793 if (err < 0)
3794 kfree_skb(_skb);
3795 }
c74e560c
GP		 3796 err = 0;
3797
36f2fd58
GP		 3798drop:
3799 kfree_skb(pi->sdu);
c74e560c
GP		 3800 break;
3801 }
3802
3803 kfree_skb(skb);
3804 return err;
3805}
3806
8f17154f
GP		 3807static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3808{
3809 struct sk_buff *skb;
afefdbc4 3810 u16 control;
8f17154f 3811
59203a21 3812 while ((skb = skb_peek(SREJ_QUEUE(sk)))) {
8f17154f
GP		 3813 if (bt_cb(skb)->tx_seq != tx_seq)
3814 break;
3815
3816 skb = skb_dequeue(SREJ_QUEUE(sk));
afefdbc4 3817 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
18778a63 3818 l2cap_ertm_reassembly_sdu(sk, skb, control);
8f17154f
GP		 3819 l2cap_pi(sk)->buffer_seq_srej =
3820 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
8ff50ec0 3821 tx_seq = (tx_seq + 1) % 64;
8f17154f
GP		 3822 }
3823}
3824
3825static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3826{
3827 struct l2cap_pinfo *pi = l2cap_pi(sk);
3828 struct srej_list *l, *tmp;
3829 u16 control;
3830
59203a21 3831 list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) {
8f17154f
GP		 3832 if (l->tx_seq == tx_seq) {
3833 list_del(&l->list);
3834 kfree(l);
3835 return;
3836 }
3837 control = L2CAP_SUPER_SELECT_REJECT;
3838 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3839 l2cap_send_sframe(pi, control);
3840 list_del(&l->list);
3841 list_add_tail(&l->list, SREJ_LIST(sk));
3842 }
3843}
3844
3845static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3846{
3847 struct l2cap_pinfo *pi = l2cap_pi(sk);
3848 struct srej_list *new;
3849 u16 control;
3850
3851 while (tx_seq != pi->expected_tx_seq) {
3852 control = L2CAP_SUPER_SELECT_REJECT;
3853 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3854 l2cap_send_sframe(pi, control);
3855
3856 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
8ff50ec0
GP		 3857 new->tx_seq = pi->expected_tx_seq;
3858 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3859 list_add_tail(&new->list, SREJ_LIST(sk));
3860 }
8ff50ec0 3861 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
8f17154f
GP		 3862}
3863
1c2acffb
GP		 3864static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3865{
3866 struct l2cap_pinfo *pi = l2cap_pi(sk);
3867 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3868 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3869 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
f6337c77 3870 int tx_seq_offset, expected_tx_seq_offset;
803020c6 3871 int num_to_ack = (pi->tx_win/6) + 1;
1c2acffb
GP		 3872 int err = 0;
3873
0e98958d
GP		 3874 BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq,
3875 rx_control);
1c2acffb 3876
9b16dc65
GP		 3877 if (L2CAP_CTRL_FINAL & rx_control &&
3878 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
1d8f5d16
GP		 3879 del_timer(&pi->monitor_timer);
3880 if (pi->unacked_frames > 0)
3881 __mod_retrans_timer();
3882 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
3883 }
3884
9f121a5a
GP		 3885 pi->expected_ack_seq = req_seq;
3886 l2cap_drop_acked_frames(sk);
3887
8f17154f
GP		 3888 if (tx_seq == pi->expected_tx_seq)
3889 goto expected;
1c2acffb 3890
9b53350d
JPRV		 3891 tx_seq_offset = (tx_seq - pi->buffer_seq) % 64;
3892 if (tx_seq_offset < 0)
3893 tx_seq_offset += 64;
3894
3895 /* invalid tx_seq */
3896 if (tx_seq_offset >= pi->tx_win) {
9b108fc0 3897 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
9b53350d
JPRV		 3898 goto drop;
3899 }
3900
1890d36b
GP		 3901 if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY)
3902 goto drop;
3903
8f17154f
GP		 3904 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3905 struct srej_list *first;
30afb5b2 3906
8f17154f
GP		 3907 first = list_first_entry(SREJ_LIST(sk),
3908 struct srej_list, list);
3909 if (tx_seq == first->tx_seq) {
3910 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3911 l2cap_check_srej_gap(sk, tx_seq);
3912
3913 list_del(&first->list);
3914 kfree(first);
3915
3916 if (list_empty(SREJ_LIST(sk))) {
3917 pi->buffer_seq = pi->buffer_seq_srej;
3918 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
855666cc 3919 l2cap_send_ack(pi);
0e98958d 3920 BT_DBG("sk %p, Exit SREJ_SENT", sk);
8f17154f
GP		 3921 }
3922 } else {
3923 struct srej_list *l;
9b53350d
JPRV		 3924
3925 /* duplicated tx_seq */
3926 if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0)
3927 goto drop;
8f17154f
GP		 3928
3929 list_for_each_entry(l, SREJ_LIST(sk), list) {
3930 if (l->tx_seq == tx_seq) {
3931 l2cap_resend_srejframe(sk, tx_seq);
3932 return 0;
3933 }
3934 }
3935 l2cap_send_srejframe(sk, tx_seq);
30afb5b2
GP		 3936 }
3937 } else {
9b53350d
JPRV		 3938 expected_tx_seq_offset =
3939 (pi->expected_tx_seq - pi->buffer_seq) % 64;
3940 if (expected_tx_seq_offset < 0)
3941 expected_tx_seq_offset += 64;
3942
3943 /* duplicated tx_seq */
3944 if (tx_seq_offset < expected_tx_seq_offset)
3945 goto drop;
3946
8f17154f 3947 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 3948
0e98958d
GP		 3949 BT_DBG("sk %p, Enter SREJ", sk);
3950
8f17154f
GP		 3951 INIT_LIST_HEAD(SREJ_LIST(sk));
3952 pi->buffer_seq_srej = pi->buffer_seq;
3953
3954 __skb_queue_head_init(SREJ_QUEUE(sk));
1890d36b 3955 __skb_queue_head_init(BUSY_QUEUE(sk));
8f17154f
GP		 3956 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3957
ef54fd93
GP		 3958 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
3959
8f17154f 3960 l2cap_send_srejframe(sk, tx_seq);
7fe9b298
GP		 3961
3962 del_timer(&pi->ack_timer);
1c2acffb 3963 }
30afb5b2
GP		 3964 return 0;
3965
8f17154f
GP		 3966expected:
3967 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3968
3969 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3b1a9f3f
GP		 3970 bt_cb(skb)->tx_seq = tx_seq;
3971 bt_cb(skb)->sar = sar;
3972 __skb_queue_tail(SREJ_QUEUE(sk), skb);
8f17154f
GP		 3973 return 0;
3974 }
3975
2ece3684
GP		 3976 err = l2cap_push_rx_skb(sk, skb, rx_control);
3977 if (err < 0)
3978 return 0;
3979
4ec10d97
GP		 3980 if (rx_control & L2CAP_CTRL_FINAL) {
3981 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3982 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 3983 else
3984 l2cap_retransmit_frames(sk);
4ec10d97
GP		 3985 }
3986
c1b4f43b
GP		 3987 __mod_ack_timer();
3988
803020c6
GP		 3989 pi->num_acked = (pi->num_acked + 1) % num_to_ack;
3990 if (pi->num_acked == num_to_ack - 1)
9e917af1
GP		 3991 l2cap_send_ack(pi);
3992
8f17154f 3993 return 0;
9b53350d
JPRV		 3994
3995drop:
3996 kfree_skb(skb);
3997 return 0;
1c2acffb
GP		 3998}
3999
e072745f 4000static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
1c2acffb
GP		 4001{
4002 struct l2cap_pinfo *pi = l2cap_pi(sk);
6e3a5981 4003
0e98958d
GP		 4004 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control),
4005 rx_control);
4006
6e3a5981
GP		 4007 pi->expected_ack_seq = __get_reqseq(rx_control);
4008 l2cap_drop_acked_frames(sk);
1c2acffb 4009
e072745f 4010 if (rx_control & L2CAP_CTRL_POLL) {
3cb123d1 4011 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
05fbd89d
GP		 4012 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
4013 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4014 (pi->unacked_frames > 0))
4015 __mod_retrans_timer();
4016
4017 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4018 l2cap_send_srejtail(sk);
4019 } else {
4020 l2cap_send_i_or_rr_or_rnr(sk);
05fbd89d 4021 }
1d8f5d16 4022
e072745f
GP		 4023 } else if (rx_control & L2CAP_CTRL_FINAL) {
4024 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 4025
e072745f
GP		 4026 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4027 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4028 else
4029 l2cap_retransmit_frames(sk);
2246b2f1 4030
e072745f 4031 } else {
e072745f
GP		 4032 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
4033 (pi->unacked_frames > 0))
4034 __mod_retrans_timer();
1c2acffb 4035
2246b2f1 4036 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
dfc909be 4037 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
e072745f 4038 l2cap_send_ack(pi);
dfc909be
GP		 4039 } else {
4040 spin_lock_bh(&pi->send_lock);
e072745f 4041 l2cap_ertm_send(sk);
dfc909be
GP		 4042 spin_unlock_bh(&pi->send_lock);
4043 }
e072745f
GP		 4044 }
4045}
2246b2f1 4046
e072745f
GP		 4047static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
4048{
4049 struct l2cap_pinfo *pi = l2cap_pi(sk);
4050 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4051
0e98958d
GP		 4052 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4053
e072745f
GP		 4054 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4055
8abb52ee 4056 pi->expected_ack_seq = tx_seq;
e072745f
GP		 4057 l2cap_drop_acked_frames(sk);
4058
4059 if (rx_control & L2CAP_CTRL_FINAL) {
4060 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
4061 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
dfc909be
GP		 4062 else
4063 l2cap_retransmit_frames(sk);
e072745f 4064 } else {
dfc909be 4065 l2cap_retransmit_frames(sk);
30afb5b2 4066
0301ef04 4067 if (pi->conn_state & L2CAP_CONN_WAIT_F)
e072745f 4068 pi->conn_state |= L2CAP_CONN_REJ_ACT;
e072745f
GP		 4069 }
4070}
4071static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
4072{
4073 struct l2cap_pinfo *pi = l2cap_pi(sk);
4074 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 4075
0e98958d
GP		 4076 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4077
e072745f 4078 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 4079
e072745f
GP		 4080 if (rx_control & L2CAP_CTRL_POLL) {
4081 pi->expected_ack_seq = tx_seq;
4082 l2cap_drop_acked_frames(sk);
3cb123d1
GP		 4083
4084 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
dfc909be
GP		 4085 l2cap_retransmit_one_frame(sk, tx_seq);
4086
4087 spin_lock_bh(&pi->send_lock);
e072745f 4088 l2cap_ertm_send(sk);
dfc909be
GP		 4089 spin_unlock_bh(&pi->send_lock);
4090
e072745f
GP		 4091 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4092 pi->srej_save_reqseq = tx_seq;
4093 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4094 }
e072745f
GP		 4095 } else if (rx_control & L2CAP_CTRL_FINAL) {
4096 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
4097 pi->srej_save_reqseq == tx_seq)
4098 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
4099 else
dfc909be 4100 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f 4101 } else {
dfc909be 4102 l2cap_retransmit_one_frame(sk, tx_seq);
e072745f
GP		 4103 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
4104 pi->srej_save_reqseq = tx_seq;
4105 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 4106 }
e072745f
GP		 4107 }
4108}
4109
4110static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
4111{
4112 struct l2cap_pinfo *pi = l2cap_pi(sk);
4113 u8 tx_seq = __get_reqseq(rx_control);
4114
0e98958d
GP		 4115 BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control);
4116
e072745f
GP		 4117 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
4118 pi->expected_ack_seq = tx_seq;
4119 l2cap_drop_acked_frames(sk);
4120
3cb123d1
GP		 4121 if (rx_control & L2CAP_CTRL_POLL)
4122 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
4123
99b0d4b7
GP		 4124 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
4125 del_timer(&pi->retrans_timer);
a2e12a2a
GP		 4126 if (rx_control & L2CAP_CTRL_POLL)
4127 l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL);
99b0d4b7 4128 return;
e072745f 4129 }
99b0d4b7
GP		 4130
4131 if (rx_control & L2CAP_CTRL_POLL)
4132 l2cap_send_srejtail(sk);
4133 else
4134 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
e072745f
GP		 4135}
4136
4137static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
4138{
4139 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
4140
9b16dc65
GP		 4141 if (L2CAP_CTRL_FINAL & rx_control &&
4142 l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) {
e072745f
GP		 4143 del_timer(&l2cap_pi(sk)->monitor_timer);
4144 if (l2cap_pi(sk)->unacked_frames > 0)
4145 __mod_retrans_timer();
4146 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
4147 }
4148
4149 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
4150 case L2CAP_SUPER_RCV_READY:
4151 l2cap_data_channel_rrframe(sk, rx_control);
8f17154f
GP		 4152 break;
4153
e072745f
GP		 4154 case L2CAP_SUPER_REJECT:
4155 l2cap_data_channel_rejframe(sk, rx_control);
4156 break;
2246b2f1 4157
e072745f
GP		 4158 case L2CAP_SUPER_SELECT_REJECT:
4159 l2cap_data_channel_srejframe(sk, rx_control);
4160 break;
4161
4162 case L2CAP_SUPER_RCV_NOT_READY:
4163 l2cap_data_channel_rnrframe(sk, rx_control);
1c2acffb
GP		 4164 break;
4165 }
4166
faaebd19 4167 kfree_skb(skb);
1c2acffb
GP		 4168 return 0;
4169}
4170
1da177e4
LT		 4171static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
4172{
4173 struct sock *sk;
6840ed07 4174 struct l2cap_pinfo *pi;
51893f88 4175 u16 control;
f6337c77 4176 u8 tx_seq, req_seq;
51893f88 4177 int len, next_tx_seq_offset, req_seq_offset;
1da177e4
LT		 4178
4179 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
4180 if (!sk) {
4181 BT_DBG("unknown cid 0x%4.4x", cid);
4182 goto drop;
4183 }
4184
6840ed07
GP		 4185 pi = l2cap_pi(sk);
4186
1da177e4
LT		 4187 BT_DBG("sk %p, len %d", sk, skb->len);
4188
4189 if (sk->sk_state != BT_CONNECTED)
4190 goto drop;
4191
6840ed07 4192 switch (pi->mode) {
1c2acffb
GP		 4193 case L2CAP_MODE_BASIC:
4194 /* If socket recv buffers overflows we drop data here
4195 * which is *bad* because L2CAP has to be reliable.
4196 * But we don't have any other choice. L2CAP doesn't
4197 * provide flow control mechanism. */
1da177e4 4198
6840ed07 4199 if (pi->imtu < skb->len)
1c2acffb 4200 goto drop;
1da177e4 4201
1c2acffb
GP		 4202 if (!sock_queue_rcv_skb(sk, skb))
4203 goto done;
4204 break;
4205
4206 case L2CAP_MODE_ERTM:
4207 control = get_unaligned_le16(skb->data);
4208 skb_pull(skb, 2);
c74e560c 4209 len = skb->len;
1c2acffb 4210
26000089
GP		 4211 /*
4212 * We can just drop the corrupted I-frame here.
4213 * Receiver will miss it and start proper recovery
4214 * procedures and ask retransmission.
4215 */
4216 if (l2cap_check_fcs(pi, skb))
4217 goto drop;
4218
bc1b1f8b 4219 if (__is_sar_start(control) && __is_iframe(control))
c74e560c
GP		 4220 len -= 2;
4221
fcc203c3
GP		 4222 if (pi->fcs == L2CAP_FCS_CRC16)
4223 len -= 2;
4224
18778a63 4225 if (len > pi->mps) {
9b108fc0 4226 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
1c2acffb 4227 goto drop;
18778a63 4228 }
1c2acffb 4229
01760bdd
JPRV		 4230 req_seq = __get_reqseq(control);
4231 req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
4232 if (req_seq_offset < 0)
4233 req_seq_offset += 64;
4234
4235 next_tx_seq_offset =
4236 (pi->next_tx_seq - pi->expected_ack_seq) % 64;
4237 if (next_tx_seq_offset < 0)
4238 next_tx_seq_offset += 64;
4239
4240 /* check for invalid req-seq */
4241 if (req_seq_offset > next_tx_seq_offset) {
9b108fc0 4242 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
01760bdd
JPRV		 4243 goto drop;
4244 }
4245
277ffbe3 4246 if (__is_iframe(control)) {
51893f88 4247 if (len < 0) {
9b108fc0 4248 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
277ffbe3 4249 goto drop;
18778a63 4250 }
277ffbe3 4251
fcafde2e 4252 l2cap_data_channel_iframe(sk, control, skb);
277ffbe3 4253 } else {
18778a63 4254 if (len != 0) {
9b108fc0 4255 l2cap_send_disconn_req(pi->conn, sk, ECONNRESET);
277ffbe3 4256 goto drop;
18778a63 4257 }
277ffbe3 4258
fcafde2e 4259 l2cap_data_channel_sframe(sk, control, skb);
277ffbe3 4260 }
1c2acffb 4261
fcafde2e 4262 goto done;
1c2acffb 4263
6840ed07
GP		 4264 case L2CAP_MODE_STREAMING:
4265 control = get_unaligned_le16(skb->data);
4266 skb_pull(skb, 2);
4267 len = skb->len;
4268
26000089
GP		 4269 if (l2cap_check_fcs(pi, skb))
4270 goto drop;
4271
6840ed07
GP		 4272 if (__is_sar_start(control))
4273 len -= 2;
4274
fcc203c3
GP		 4275 if (pi->fcs == L2CAP_FCS_CRC16)
4276 len -= 2;
4277
51893f88 4278 if (len > pi->mps || len < 0 || __is_sframe(control))
6840ed07
GP		 4279 goto drop;
4280
4281 tx_seq = __get_txseq(control);
4282
4283 if (pi->expected_tx_seq == tx_seq)
4284 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
4285 else
7dffe421 4286 pi->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 4287
18778a63 4288 l2cap_streaming_reassembly_sdu(sk, skb, control);
6840ed07
GP		 4289
4290 goto done;
4291
1c2acffb 4292 default:
e8235c6b 4293 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
1c2acffb
GP		 4294 break;
4295 }
1da177e4
LT		 4296
4297drop:
4298 kfree_skb(skb);
4299
4300done:
0139418c
MH		 4301 if (sk)
4302 bh_unlock_sock(sk);
4303
1da177e4
LT		 4304 return 0;
4305}
4306
8e036fc3 4307static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4
LT		 4308{
4309 struct sock *sk;
4310
4311 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
4312 if (!sk)
4313 goto drop;
4314
4315 BT_DBG("sk %p, len %d", sk, skb->len);
4316
4317 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
4318 goto drop;
4319
4320 if (l2cap_pi(sk)->imtu < skb->len)
4321 goto drop;
4322
4323 if (!sock_queue_rcv_skb(sk, skb))
4324 goto done;
4325
4326drop:
4327 kfree_skb(skb);
4328
4329done:
af05b30b
GP		 4330 if (sk)
4331 bh_unlock_sock(sk);
1da177e4
LT		 4332 return 0;
4333}
4334
4335static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
4336{
4337 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 4338 u16 cid, len;
4339 __le16 psm;
1da177e4
LT		 4340
4341 skb_pull(skb, L2CAP_HDR_SIZE);
4342 cid = __le16_to_cpu(lh->cid);
4343 len = __le16_to_cpu(lh->len);
4344
1c2acffb
GP		 4345 if (len != skb->len) {
4346 kfree_skb(skb);
4347 return;
4348 }
4349
1da177e4
LT		 4350 BT_DBG("len %d, cid 0x%4.4x", len, cid);
4351
4352 switch (cid) {
8db4dc46 4353 case L2CAP_CID_SIGNALING:
1da177e4
LT		 4354 l2cap_sig_channel(conn, skb);
4355 break;
4356
8db4dc46 4357 case L2CAP_CID_CONN_LESS:
1b7bf4ed 4358 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 4359 skb_pull(skb, 2);
4360 l2cap_conless_channel(conn, psm, skb);
4361 break;
4362
4363 default:
4364 l2cap_data_channel(conn, cid, skb);
4365 break;
4366 }
4367}
4368
4369/* ---- L2CAP interface with lower layer (HCI) ---- */
4370
4371static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
4372{
4373 int exact = 0, lm1 = 0, lm2 = 0;
4374 register struct sock *sk;
4375 struct hlist_node *node;
4376
4377 if (type != ACL_LINK)
4378 return 0;
4379
4380 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
4381
4382 /* Find listening sockets and check their link_mode */
4383 read_lock(&l2cap_sk_list.lock);
4384 sk_for_each(sk, node, &l2cap_sk_list.head) {
4385 if (sk->sk_state != BT_LISTEN)
4386 continue;
4387
4388 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5
MH		 4389 lm1 |= HCI_LM_ACCEPT;
4390 if (l2cap_pi(sk)->role_switch)
4391 lm1 |= HCI_LM_MASTER;
1da177e4 4392 exact++;
2af6b9d5
MH		 4393 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
4394 lm2 |= HCI_LM_ACCEPT;
4395 if (l2cap_pi(sk)->role_switch)
4396 lm2 |= HCI_LM_MASTER;
4397 }
1da177e4
LT		 4398 }
4399 read_unlock(&l2cap_sk_list.lock);
4400
4401 return exact ? lm1 : lm2;
4402}
4403
4404static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
4405{
0139418c
MH		 4406 struct l2cap_conn *conn;
4407
1da177e4
LT		 4408 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
4409
4410 if (hcon->type != ACL_LINK)
4411 return 0;
4412
4413 if (!status) {
1da177e4
LT		 4414 conn = l2cap_conn_add(hcon, status);
4415 if (conn)
4416 l2cap_conn_ready(conn);
0139418c 4417 } else
1da177e4
LT		 4418 l2cap_conn_del(hcon, bt_err(status));
4419
4420 return 0;
4421}
4422
2950f21a
MH		 4423static int l2cap_disconn_ind(struct hci_conn *hcon)
4424{
4425 struct l2cap_conn *conn = hcon->l2cap_data;
4426
4427 BT_DBG("hcon %p", hcon);
4428
4429 if (hcon->type != ACL_LINK || !conn)
4430 return 0x13;
4431
4432 return conn->disc_reason;
4433}
4434
4435static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 4436{
4437 BT_DBG("hcon %p reason %d", hcon, reason);
4438
4439 if (hcon->type != ACL_LINK)
4440 return 0;
4441
4442 l2cap_conn_del(hcon, bt_err(reason));
0139418c 4443
1da177e4
LT		 4444 return 0;
4445}
4446
f62e4323
MH		 4447static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
4448{
bd3c9e25 4449 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
255c7601
MH		 4450 return;
4451
f62e4323
MH		 4452 if (encrypt == 0x00) {
4453 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
4454 l2cap_sock_clear_timer(sk);
4455 l2cap_sock_set_timer(sk, HZ * 5);
4456 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
4457 __l2cap_sock_close(sk, ECONNREFUSED);
4458 } else {
4459 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
4460 l2cap_sock_clear_timer(sk);
4461 }
4462}
4463
8c1b2355 4464static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4
LT		 4465{
4466 struct l2cap_chan_list *l;
0139418c 4467 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 4468 struct sock *sk;
1da177e4 4469
0139418c 4470 if (!conn)
1da177e4 4471 return 0;
0139418c 4472
1da177e4
LT		 4473 l = &conn->chan_list;
4474
4475 BT_DBG("conn %p", conn);
4476
4477 read_lock(&l->lock);
4478
4479 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
4480 bh_lock_sock(sk);
4481
6a8d3010
MH		 4482 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
4483 bh_unlock_sock(sk);
4484 continue;
4485 }
4486
f62e4323 4487 if (!status && (sk->sk_state == BT_CONNECTED ||
8c1b2355 4488 sk->sk_state == BT_CONFIG)) {
f62e4323 4489 l2cap_check_encryption(sk, encrypt);
9719f8af
MH		 4490 bh_unlock_sock(sk);
4491 continue;
4492 }
4493
b1235d79
MH		 4494 if (sk->sk_state == BT_CONNECT) {
4495 if (!status) {
4496 struct l2cap_conn_req req;
4497 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
4498 req.psm = l2cap_pi(sk)->psm;
1da177e4 4499
b1235d79 4500 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
e501d055 4501 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4 4502
b1235d79
MH		 4503 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4504 L2CAP_CONN_REQ, sizeof(req), &req);
4505 } else {
4506 l2cap_sock_clear_timer(sk);
4507 l2cap_sock_set_timer(sk, HZ / 10);
4508 }
4509 } else if (sk->sk_state == BT_CONNECT2) {
4510 struct l2cap_conn_rsp rsp;
4511 __u16 result;
1da177e4 4512
b1235d79
MH		 4513 if (!status) {
4514 sk->sk_state = BT_CONFIG;
4515 result = L2CAP_CR_SUCCESS;
4516 } else {
4517 sk->sk_state = BT_DISCONN;
4518 l2cap_sock_set_timer(sk, HZ / 10);
4519 result = L2CAP_CR_SEC_BLOCK;
4520 }
4521
4522 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
4523 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
4524 rsp.result = cpu_to_le16(result);
e7c29cb1 4525 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
b1235d79
MH		 4526 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4527 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4528 }
1da177e4
LT		 4529
4530 bh_unlock_sock(sk);
4531 }
4532
4533 read_unlock(&l->lock);
b1235d79 4534
1da177e4
LT		 4535 return 0;
4536}
4537
4538static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4539{
4540 struct l2cap_conn *conn = hcon->l2cap_data;
4541
4542 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4543 goto drop;
4544
4545 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4546
4547 if (flags & ACL_START) {
4548 struct l2cap_hdr *hdr;
4549 int len;
4550
4551 if (conn->rx_len) {
4552 BT_ERR("Unexpected start frame (len %d)", skb->len);
4553 kfree_skb(conn->rx_skb);
4554 conn->rx_skb = NULL;
4555 conn->rx_len = 0;
4556 l2cap_conn_unreliable(conn, ECOMM);
4557 }
4558
4559 if (skb->len < 2) {
4560 BT_ERR("Frame is too short (len %d)", skb->len);
4561 l2cap_conn_unreliable(conn, ECOMM);
4562 goto drop;
4563 }
4564
4565 hdr = (struct l2cap_hdr *) skb->data;
4566 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4567
4568 if (len == skb->len) {
4569 /* Complete frame received */
4570 l2cap_recv_frame(conn, skb);
4571 return 0;
4572 }
4573
4574 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4575
4576 if (skb->len > len) {
4577 BT_ERR("Frame is too long (len %d, expected len %d)",
4578 skb->len, len);
4579 l2cap_conn_unreliable(conn, ECOMM);
4580 goto drop;
4581 }
4582
4583 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4584 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4585 if (!conn->rx_skb)
1da177e4
LT		 4586 goto drop;
4587
d626f62b 4588 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4589 skb->len);
1da177e4
LT		 4590 conn->rx_len = len - skb->len;
4591 } else {
4592 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4593
4594 if (!conn->rx_len) {
4595 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4596 l2cap_conn_unreliable(conn, ECOMM);
4597 goto drop;
4598 }
4599
4600 if (skb->len > conn->rx_len) {
4601 BT_ERR("Fragment is too long (len %d, expected %d)",
4602 skb->len, conn->rx_len);
4603 kfree_skb(conn->rx_skb);
4604 conn->rx_skb = NULL;
4605 conn->rx_len = 0;
4606 l2cap_conn_unreliable(conn, ECOMM);
4607 goto drop;
4608 }
4609
d626f62b 4610 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4611 skb->len);
1da177e4
LT		 4612 conn->rx_len -= skb->len;
4613
4614 if (!conn->rx_len) {
4615 /* Complete frame received */
4616 l2cap_recv_frame(conn, conn->rx_skb);
4617 conn->rx_skb = NULL;
4618 }
4619 }
4620
4621drop:
4622 kfree_skb(skb);
4623 return 0;
4624}
4625
aef7d97c 4626static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4
LT		 4627{
4628 struct sock *sk;
4629 struct hlist_node *node;
1da177e4
LT		 4630
4631 read_lock_bh(&l2cap_sk_list.lock);
4632
be9d1227
MH		 4633 sk_for_each(sk, node, &l2cap_sk_list.head) {
4634 struct l2cap_pinfo *pi = l2cap_pi(sk);
101545f6 4635
aef7d97c
MH		 4636 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4637 batostr(&bt_sk(sk)->src),
4638 batostr(&bt_sk(sk)->dst),
4639 sk->sk_state, __le16_to_cpu(pi->psm),
4640 pi->scid, pi->dcid,
4641 pi->imtu, pi->omtu, pi->sec_level);
be9d1227 4642 }
1da177e4 4643
1da177e4 4644 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 4645
aef7d97c 4646 return 0;
1da177e4
LT		 4647}
4648
aef7d97c
MH		 4649static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4650{
4651 return single_open(file, l2cap_debugfs_show, inode->i_private);
4652}
4653
4654static const struct file_operations l2cap_debugfs_fops = {
4655 .open = l2cap_debugfs_open,
4656 .read = seq_read,
4657 .llseek = seq_lseek,
4658 .release = single_release,
4659};
4660
4661static struct dentry *l2cap_debugfs;
1da177e4 4662
90ddc4f0 4663static const struct proto_ops l2cap_sock_ops = {
1da177e4
LT		 4664 .family = PF_BLUETOOTH,
4665 .owner = THIS_MODULE,
4666 .release = l2cap_sock_release,
4667 .bind = l2cap_sock_bind,
4668 .connect = l2cap_sock_connect,
4669 .listen = l2cap_sock_listen,
4670 .accept = l2cap_sock_accept,
4671 .getname = l2cap_sock_getname,
4672 .sendmsg = l2cap_sock_sendmsg,
f66dc81f 4673 .recvmsg = l2cap_sock_recvmsg,
1da177e4 4674 .poll = bt_sock_poll,
3241ad82 4675 .ioctl = bt_sock_ioctl,
1da177e4
LT		 4676 .mmap = sock_no_mmap,
4677 .socketpair = sock_no_socketpair,
1da177e4
LT		 4678 .shutdown = l2cap_sock_shutdown,
4679 .setsockopt = l2cap_sock_setsockopt,
4680 .getsockopt = l2cap_sock_getsockopt
4681};
4682
ec1b4cf7 4683static const struct net_proto_family l2cap_sock_family_ops = {
1da177e4
LT		 4684 .family = PF_BLUETOOTH,
4685 .owner = THIS_MODULE,
4686 .create = l2cap_sock_create,
4687};
4688
4689static struct hci_proto l2cap_hci_proto = {
4690 .name = "L2CAP",
4691 .id = HCI_PROTO_L2CAP,
4692 .connect_ind = l2cap_connect_ind,
4693 .connect_cfm = l2cap_connect_cfm,
4694 .disconn_ind = l2cap_disconn_ind,
2950f21a 4695 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4696 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4697 .recv_acldata = l2cap_recv_acldata
4698};
4699
4700static int __init l2cap_init(void)
4701{
4702 int err;
be9d1227 4703
1da177e4
LT		 4704 err = proto_register(&l2cap_proto, 0);
4705 if (err < 0)
4706 return err;
4707
1890d36b
GP		 4708 _busy_wq = create_singlethread_workqueue("l2cap");
4709 if (!_busy_wq)
4710 goto error;
4711
1da177e4
LT		 4712 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4713 if (err < 0) {
4714 BT_ERR("L2CAP socket registration failed");
4715 goto error;
4716 }
4717
4718 err = hci_register_proto(&l2cap_hci_proto);
4719 if (err < 0) {
4720 BT_ERR("L2CAP protocol registration failed");
4721 bt_sock_unregister(BTPROTO_L2CAP);
4722 goto error;
4723 }
4724
aef7d97c
MH		 4725 if (bt_debugfs) {
4726 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4727 bt_debugfs, NULL, &l2cap_debugfs_fops);
4728 if (!l2cap_debugfs)
4729 BT_ERR("Failed to create L2CAP debug file");
4730 }
1da177e4
LT		 4731
4732 BT_INFO("L2CAP ver %s", VERSION);
4733 BT_INFO("L2CAP socket layer initialized");
4734
4735 return 0;
4736
4737error:
4738 proto_unregister(&l2cap_proto);
4739 return err;
4740}
4741
4742static void __exit l2cap_exit(void)
4743{
aef7d97c 4744 debugfs_remove(l2cap_debugfs);
1da177e4 4745
1890d36b
GP		 4746 flush_workqueue(_busy_wq);
4747 destroy_workqueue(_busy_wq);
4748
1da177e4
LT		 4749 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4750 BT_ERR("L2CAP socket unregistration failed");
4751
4752 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4753 BT_ERR("L2CAP protocol unregistration failed");
4754
4755 proto_unregister(&l2cap_proto);
4756}
4757
4758void l2cap_load(void)
4759{
4760 /* Dummy function to trigger automatic L2CAP module loading by
4761 * other modules that use L2CAP sockets but don't use any other
4762 * symbols from it. */
1da177e4
LT		 4763}
4764EXPORT_SYMBOL(l2cap_load);
4765
4766module_init(l2cap_init);
4767module_exit(l2cap_exit);
4768
44dd46de
MH		 4769module_param(enable_ertm, bool, 0644);
4770MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
4771
63fbd24e 4772MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 4773MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4774MODULE_VERSION(VERSION);
4775MODULE_LICENSE("GPL");
4776MODULE_ALIAS("bt-proto-0");
kernel source for telekom puls (alcatel/mediatek)