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Bluetooth: Ignore Tx Window value with Streaming 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;
5fbcd3d1 59static int max_transmit = L2CAP_DEFAULT_MAX_TX;
f0709e03 60
47ec1dcd 61static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
e1027a7c 62static u8 l2cap_fixed_chan[8] = { 0x02, };
1da177e4 63
90ddc4f0 64static const struct proto_ops l2cap_sock_ops;
1da177e4
LT		 65
66static struct bt_sock_list l2cap_sk_list = {
d5fb2962 67 .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
1da177e4
LT		 68};
69
1da177e4
LT		 70static void __l2cap_sock_close(struct sock *sk, int reason);
71static void l2cap_sock_close(struct sock *sk);
72static void l2cap_sock_kill(struct sock *sk);
73
74static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
75 u8 code, u8 ident, u16 dlen, void *data);
76
77/* ---- L2CAP timers ---- */
78static void l2cap_sock_timeout(unsigned long arg)
79{
80 struct sock *sk = (struct sock *) arg;
b1235d79 81 int reason;
1da177e4
LT		 82
83 BT_DBG("sock %p state %d", sk, sk->sk_state);
84
85 bh_lock_sock(sk);
b1235d79 86
f62e4323
MH		 87 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG)
88 reason = ECONNREFUSED;
89 else if (sk->sk_state == BT_CONNECT &&
2af6b9d5 90 l2cap_pi(sk)->sec_level != BT_SECURITY_SDP)
b1235d79
MH		 91 reason = ECONNREFUSED;
92 else
93 reason = ETIMEDOUT;
94
95 __l2cap_sock_close(sk, reason);
96
1da177e4
LT		 97 bh_unlock_sock(sk);
98
99 l2cap_sock_kill(sk);
100 sock_put(sk);
101}
102
103static void l2cap_sock_set_timer(struct sock *sk, long timeout)
104{
105 BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout);
106 sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout);
107}
108
109static void l2cap_sock_clear_timer(struct sock *sk)
110{
111 BT_DBG("sock %p state %d", sk, sk->sk_state);
112 sk_stop_timer(sk, &sk->sk_timer);
113}
114
0139418c
MH		 115/* ---- L2CAP channels ---- */
116static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
117{
118 struct sock *s;
119 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
120 if (l2cap_pi(s)->dcid == cid)
121 break;
122 }
123 return s;
124}
125
126static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
127{
128 struct sock *s;
129 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
130 if (l2cap_pi(s)->scid == cid)
131 break;
132 }
133 return s;
134}
135
136/* Find channel with given SCID.
137 * Returns locked socket */
138static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
139{
140 struct sock *s;
141 read_lock(&l->lock);
142 s = __l2cap_get_chan_by_scid(l, cid);
af05b30b
GP		 143 if (s)
144 bh_lock_sock(s);
0139418c
MH		 145 read_unlock(&l->lock);
146 return s;
147}
148
149static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
150{
151 struct sock *s;
152 for (s = l->head; s; s = l2cap_pi(s)->next_c) {
153 if (l2cap_pi(s)->ident == ident)
154 break;
155 }
156 return s;
157}
158
159static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
160{
161 struct sock *s;
162 read_lock(&l->lock);
163 s = __l2cap_get_chan_by_ident(l, ident);
af05b30b
GP		 164 if (s)
165 bh_lock_sock(s);
0139418c
MH		 166 read_unlock(&l->lock);
167 return s;
168}
169
170static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
171{
8db4dc46 172 u16 cid = L2CAP_CID_DYN_START;
0139418c 173
8db4dc46 174 for (; cid < L2CAP_CID_DYN_END; cid++) {
af05b30b 175 if (!__l2cap_get_chan_by_scid(l, cid))
0139418c
MH		 176 return cid;
177 }
178
179 return 0;
180}
181
182static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
183{
184 sock_hold(sk);
185
186 if (l->head)
187 l2cap_pi(l->head)->prev_c = sk;
188
189 l2cap_pi(sk)->next_c = l->head;
190 l2cap_pi(sk)->prev_c = NULL;
191 l->head = sk;
192}
193
194static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
195{
196 struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
197
fd1278d7 198 write_lock_bh(&l->lock);
0139418c
MH		 199 if (sk == l->head)
200 l->head = next;
201
202 if (next)
203 l2cap_pi(next)->prev_c = prev;
204 if (prev)
205 l2cap_pi(prev)->next_c = next;
fd1278d7 206 write_unlock_bh(&l->lock);
0139418c
MH		 207
208 __sock_put(sk);
209}
210
211static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
212{
213 struct l2cap_chan_list *l = &conn->chan_list;
214
af05b30b
GP		 215 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
216 l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
0139418c 217
2950f21a
MH		 218 conn->disc_reason = 0x13;
219
0139418c
MH		 220 l2cap_pi(sk)->conn = conn;
221
222 if (sk->sk_type == SOCK_SEQPACKET) {
223 /* Alloc CID for connection-oriented socket */
224 l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
225 } else if (sk->sk_type == SOCK_DGRAM) {
226 /* Connectionless socket */
8db4dc46
GP		 227 l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS;
228 l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS;
0139418c
MH		 229 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
230 } else {
231 /* Raw socket can send/recv signalling messages only */
8db4dc46
GP		 232 l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING;
233 l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING;
0139418c
MH		 234 l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
235 }
236
237 __l2cap_chan_link(l, sk);
238
239 if (parent)
240 bt_accept_enqueue(parent, sk);
241}
242
8e87d142 243/* Delete channel.
0139418c
MH		 244 * Must be called on the locked socket. */
245static void l2cap_chan_del(struct sock *sk, int err)
246{
247 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
248 struct sock *parent = bt_sk(sk)->parent;
249
250 l2cap_sock_clear_timer(sk);
251
252 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
253
8e87d142 254 if (conn) {
0139418c
MH		 255 /* Unlink from channel list */
256 l2cap_chan_unlink(&conn->chan_list, sk);
257 l2cap_pi(sk)->conn = NULL;
258 hci_conn_put(conn->hcon);
259 }
260
b1235d79 261 sk->sk_state = BT_CLOSED;
0139418c
MH		 262 sock_set_flag(sk, SOCK_ZAPPED);
263
264 if (err)
265 sk->sk_err = err;
266
267 if (parent) {
268 bt_accept_unlink(sk);
269 parent->sk_data_ready(parent, 0);
270 } else
271 sk->sk_state_change(sk);
272}
273
79d554a6 274/* Service level security */
2af6b9d5 275static inline int l2cap_check_security(struct sock *sk)
79d554a6
MH		 276{
277 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
0684e5f9
MH		 278 __u8 auth_type;
279
00ae4af9
MH		 280 if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
281 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
282 auth_type = HCI_AT_NO_BONDING_MITM;
283 else
af05b30b 284 auth_type = HCI_AT_NO_BONDING;
00ae4af9
MH		 285
286 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
287 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
288 } else {
289 switch (l2cap_pi(sk)->sec_level) {
290 case BT_SECURITY_HIGH:
291 auth_type = HCI_AT_GENERAL_BONDING_MITM;
292 break;
293 case BT_SECURITY_MEDIUM:
294 auth_type = HCI_AT_GENERAL_BONDING;
295 break;
296 default:
297 auth_type = HCI_AT_NO_BONDING;
298 break;
299 }
0684e5f9 300 }
79d554a6 301
0684e5f9
MH		 302 return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level,
303 auth_type);
79d554a6
MH		 304}
305
4e8402a3
MH		 306static inline u8 l2cap_get_ident(struct l2cap_conn *conn)
307{
308 u8 id;
309
310 /* Get next available identificator.
311 * 1 - 128 are used by kernel.
312 * 129 - 199 are reserved.
313 * 200 - 254 are used by utilities like l2ping, etc.
314 */
315
316 spin_lock_bh(&conn->lock);
317
318 if (++conn->tx_ident > 128)
319 conn->tx_ident = 1;
320
321 id = conn->tx_ident;
322
323 spin_unlock_bh(&conn->lock);
324
325 return id;
326}
327
328static inline int l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
329{
330 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
331
332 BT_DBG("code 0x%2.2x", code);
333
334 if (!skb)
335 return -ENOMEM;
336
337 return hci_send_acl(conn->hcon, skb, 0);
338}
339
1c2acffb
GP		 340static inline int l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control)
341{
342 struct sk_buff *skb;
343 struct l2cap_hdr *lh;
344 struct l2cap_conn *conn = pi->conn;
fcc203c3
GP		 345 int count, hlen = L2CAP_HDR_SIZE + 2;
346
347 if (pi->fcs == L2CAP_FCS_CRC16)
348 hlen += 2;
1c2acffb
GP		 349
350 BT_DBG("pi %p, control 0x%2.2x", pi, control);
351
fcc203c3 352 count = min_t(unsigned int, conn->mtu, hlen);
1c2acffb
GP		 353 control |= L2CAP_CTRL_FRAME_TYPE;
354
9e917af1
GP		 355 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
356 control |= L2CAP_CTRL_FINAL;
357 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
358 }
359
f0946ccf
GP		 360 if (pi->conn_state & L2CAP_CONN_SEND_PBIT) {
361 control |= L2CAP_CTRL_POLL;
362 pi->conn_state &= ~L2CAP_CONN_SEND_PBIT;
363 }
364
1c2acffb
GP		 365 skb = bt_skb_alloc(count, GFP_ATOMIC);
366 if (!skb)
367 return -ENOMEM;
368
369 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
fcc203c3 370 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1c2acffb
GP		 371 lh->cid = cpu_to_le16(pi->dcid);
372 put_unaligned_le16(control, skb_put(skb, 2));
373
fcc203c3
GP		 374 if (pi->fcs == L2CAP_FCS_CRC16) {
375 u16 fcs = crc16(0, (u8 *)lh, count - 2);
376 put_unaligned_le16(fcs, skb_put(skb, 2));
377 }
378
1c2acffb
GP		 379 return hci_send_acl(pi->conn->hcon, skb, 0);
380}
381
7e743090
GP		 382static inline int l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control)
383{
384 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY)
385 control |= L2CAP_SUPER_RCV_NOT_READY;
386 else
387 control |= L2CAP_SUPER_RCV_READY;
388
2ab25cdd
GP		 389 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
390
7e743090
GP		 391 return l2cap_send_sframe(pi, control);
392}
393
79d554a6
MH		 394static void l2cap_do_start(struct sock *sk)
395{
396 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
397
398 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
984947dc
MH		 399 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
400 return;
401
2af6b9d5 402 if (l2cap_check_security(sk)) {
b1235d79
MH		 403 struct l2cap_conn_req req;
404 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
405 req.psm = l2cap_pi(sk)->psm;
79d554a6 406
b1235d79 407 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
79d554a6 408
b1235d79 409 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
79d554a6 410 L2CAP_CONN_REQ, sizeof(req), &req);
b1235d79 411 }
79d554a6
MH		 412 } else {
413 struct l2cap_info_req req;
414 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
415
416 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
417 conn->info_ident = l2cap_get_ident(conn);
418
419 mod_timer(&conn->info_timer, jiffies +
420 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
421
422 l2cap_send_cmd(conn, conn->info_ident,
423 L2CAP_INFO_REQ, sizeof(req), &req);
424 }
425}
426
22121fc9
GP		 427static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk)
428{
429 struct l2cap_disconn_req req;
430
431 req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid);
432 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
433 l2cap_send_cmd(conn, l2cap_get_ident(conn),
434 L2CAP_DISCONN_REQ, sizeof(req), &req);
435}
436
1da177e4 437/* ---- L2CAP connections ---- */
4e8402a3
MH		 438static void l2cap_conn_start(struct l2cap_conn *conn)
439{
440 struct l2cap_chan_list *l = &conn->chan_list;
441 struct sock *sk;
442
443 BT_DBG("conn %p", conn);
444
445 read_lock(&l->lock);
446
447 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
448 bh_lock_sock(sk);
449
450 if (sk->sk_type != SOCK_SEQPACKET) {
79d554a6
MH		 451 bh_unlock_sock(sk);
452 continue;
453 }
454
455 if (sk->sk_state == BT_CONNECT) {
2af6b9d5 456 if (l2cap_check_security(sk)) {
b1235d79
MH		 457 struct l2cap_conn_req req;
458 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
459 req.psm = l2cap_pi(sk)->psm;
79d554a6 460
b1235d79 461 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
79d554a6 462
b1235d79 463 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4e8402a3 464 L2CAP_CONN_REQ, sizeof(req), &req);
b1235d79 465 }
79d554a6
MH		 466 } else if (sk->sk_state == BT_CONNECT2) {
467 struct l2cap_conn_rsp rsp;
468 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
469 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
470
2af6b9d5 471 if (l2cap_check_security(sk)) {
f66dc81f
MH		 472 if (bt_sk(sk)->defer_setup) {
473 struct sock *parent = bt_sk(sk)->parent;
474 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
475 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
476 parent->sk_data_ready(parent, 0);
477
478 } else {
479 sk->sk_state = BT_CONFIG;
480 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
481 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
482 }
79d554a6
MH		 483 } else {
484 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
485 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
486 }
487
488 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
489 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4e8402a3
MH		 490 }
491
492 bh_unlock_sock(sk);
493 }
494
495 read_unlock(&l->lock);
496}
497
498static void l2cap_conn_ready(struct l2cap_conn *conn)
499{
79d554a6
MH		 500 struct l2cap_chan_list *l = &conn->chan_list;
501 struct sock *sk;
4e8402a3 502
79d554a6 503 BT_DBG("conn %p", conn);
4e8402a3 504
79d554a6 505 read_lock(&l->lock);
4e8402a3 506
79d554a6
MH		 507 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
508 bh_lock_sock(sk);
4e8402a3 509
79d554a6
MH		 510 if (sk->sk_type != SOCK_SEQPACKET) {
511 l2cap_sock_clear_timer(sk);
512 sk->sk_state = BT_CONNECTED;
513 sk->sk_state_change(sk);
514 } else if (sk->sk_state == BT_CONNECT)
515 l2cap_do_start(sk);
4e8402a3 516
79d554a6 517 bh_unlock_sock(sk);
4e8402a3 518 }
79d554a6
MH		 519
520 read_unlock(&l->lock);
4e8402a3
MH		 521}
522
523/* Notify sockets that we cannot guaranty reliability anymore */
524static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
525{
526 struct l2cap_chan_list *l = &conn->chan_list;
527 struct sock *sk;
528
529 BT_DBG("conn %p", conn);
530
531 read_lock(&l->lock);
532
533 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2af6b9d5 534 if (l2cap_pi(sk)->force_reliable)
4e8402a3
MH		 535 sk->sk_err = err;
536 }
537
538 read_unlock(&l->lock);
539}
540
541static void l2cap_info_timeout(unsigned long arg)
542{
543 struct l2cap_conn *conn = (void *) arg;
544
984947dc 545 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 546 conn->info_ident = 0;
984947dc 547
4e8402a3
MH		 548 l2cap_conn_start(conn);
549}
550
1da177e4
LT		 551static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
552{
0139418c 553 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 554
0139418c 555 if (conn || status)
1da177e4
LT		 556 return conn;
557
0139418c
MH		 558 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
559 if (!conn)
1da177e4 560 return NULL;
1da177e4
LT		 561
562 hcon->l2cap_data = conn;
563 conn->hcon = hcon;
564
0139418c
MH		 565 BT_DBG("hcon %p conn %p", hcon, conn);
566
1da177e4
LT		 567 conn->mtu = hcon->hdev->acl_mtu;
568 conn->src = &hcon->hdev->bdaddr;
569 conn->dst = &hcon->dst;
570
4e8402a3
MH		 571 conn->feat_mask = 0;
572
1da177e4
LT		 573 spin_lock_init(&conn->lock);
574 rwlock_init(&conn->chan_list.lock);
575
45054dc1
DY		 576 setup_timer(&conn->info_timer, l2cap_info_timeout,
577 (unsigned long) conn);
578
2950f21a
MH		 579 conn->disc_reason = 0x13;
580
1da177e4
LT		 581 return conn;
582}
583
0139418c 584static void l2cap_conn_del(struct hci_conn *hcon, int err)
1da177e4 585{
0139418c 586 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4
LT		 587 struct sock *sk;
588
0139418c
MH		 589 if (!conn)
590 return;
1da177e4
LT		 591
592 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
593
7585b97a 594 kfree_skb(conn->rx_skb);
1da177e4
LT		 595
596 /* Kill channels */
597 while ((sk = conn->chan_list.head)) {
598 bh_lock_sock(sk);
599 l2cap_chan_del(sk, err);
600 bh_unlock_sock(sk);
601 l2cap_sock_kill(sk);
602 }
603
8e8440f5
DY		 604 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
605 del_timer_sync(&conn->info_timer);
3ab22731 606
1da177e4
LT		 607 hcon->l2cap_data = NULL;
608 kfree(conn);
1da177e4
LT		 609}
610
611static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
612{
613 struct l2cap_chan_list *l = &conn->chan_list;
fd1278d7 614 write_lock_bh(&l->lock);
1da177e4 615 __l2cap_chan_add(conn, sk, parent);
fd1278d7 616 write_unlock_bh(&l->lock);
1da177e4
LT		 617}
618
1da177e4 619/* ---- Socket interface ---- */
8e036fc3 620static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src)
1da177e4
LT		 621{
622 struct sock *sk;
623 struct hlist_node *node;
624 sk_for_each(sk, node, &l2cap_sk_list.head)
625 if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src))
626 goto found;
627 sk = NULL;
628found:
629 return sk;
630}
631
632/* Find socket with psm and source bdaddr.
633 * Returns closest match.
634 */
8e036fc3 635static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4
LT		 636{
637 struct sock *sk = NULL, *sk1 = NULL;
638 struct hlist_node *node;
639
640 sk_for_each(sk, node, &l2cap_sk_list.head) {
641 if (state && sk->sk_state != state)
642 continue;
643
644 if (l2cap_pi(sk)->psm == psm) {
645 /* Exact match. */
646 if (!bacmp(&bt_sk(sk)->src, src))
647 break;
648
649 /* Closest match */
650 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
651 sk1 = sk;
652 }
653 }
654 return node ? sk : sk1;
655}
656
657/* Find socket with given address (psm, src).
658 * Returns locked socket */
8e036fc3 659static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src)
1da177e4
LT		 660{
661 struct sock *s;
662 read_lock(&l2cap_sk_list.lock);
663 s = __l2cap_get_sock_by_psm(state, psm, src);
af05b30b
GP		 664 if (s)
665 bh_lock_sock(s);
1da177e4
LT		 666 read_unlock(&l2cap_sk_list.lock);
667 return s;
668}
669
670static void l2cap_sock_destruct(struct sock *sk)
671{
672 BT_DBG("sk %p", sk);
673
674 skb_queue_purge(&sk->sk_receive_queue);
675 skb_queue_purge(&sk->sk_write_queue);
676}
677
678static void l2cap_sock_cleanup_listen(struct sock *parent)
679{
680 struct sock *sk;
681
682 BT_DBG("parent %p", parent);
683
684 /* Close not yet accepted channels */
685 while ((sk = bt_accept_dequeue(parent, NULL)))
686 l2cap_sock_close(sk);
687
b1235d79 688 parent->sk_state = BT_CLOSED;
1da177e4
LT		 689 sock_set_flag(parent, SOCK_ZAPPED);
690}
691
692/* Kill socket (only if zapped and orphan)
693 * Must be called on unlocked socket.
694 */
695static void l2cap_sock_kill(struct sock *sk)
696{
697 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
698 return;
699
700 BT_DBG("sk %p state %d", sk, sk->sk_state);
701
702 /* Kill poor orphan */
703 bt_sock_unlink(&l2cap_sk_list, sk);
704 sock_set_flag(sk, SOCK_DEAD);
705 sock_put(sk);
706}
707
708static void __l2cap_sock_close(struct sock *sk, int reason)
709{
710 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
711
712 switch (sk->sk_state) {
713 case BT_LISTEN:
714 l2cap_sock_cleanup_listen(sk);
715 break;
716
717 case BT_CONNECTED:
718 case BT_CONFIG:
1da177e4
LT		 719 if (sk->sk_type == SOCK_SEQPACKET) {
720 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1da177e4
LT		 721
722 sk->sk_state = BT_DISCONN;
723 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
22121fc9 724 l2cap_send_disconn_req(conn, sk);
b1235d79 725 } else
1da177e4 726 l2cap_chan_del(sk, reason);
1da177e4
LT		 727 break;
728
f66dc81f
MH		 729 case BT_CONNECT2:
730 if (sk->sk_type == SOCK_SEQPACKET) {
731 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
732 struct l2cap_conn_rsp rsp;
733 __u16 result;
734
735 if (bt_sk(sk)->defer_setup)
736 result = L2CAP_CR_SEC_BLOCK;
737 else
738 result = L2CAP_CR_BAD_PSM;
739
740 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
741 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
742 rsp.result = cpu_to_le16(result);
743 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
744 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
745 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
746 } else
747 l2cap_chan_del(sk, reason);
748 break;
749
1da177e4
LT		 750 case BT_CONNECT:
751 case BT_DISCONN:
752 l2cap_chan_del(sk, reason);
753 break;
754
755 default:
756 sock_set_flag(sk, SOCK_ZAPPED);
757 break;
758 }
759}
760
761/* Must be called on unlocked socket. */
762static void l2cap_sock_close(struct sock *sk)
763{
764 l2cap_sock_clear_timer(sk);
765 lock_sock(sk);
766 __l2cap_sock_close(sk, ECONNRESET);
767 release_sock(sk);
768 l2cap_sock_kill(sk);
769}
770
771static void l2cap_sock_init(struct sock *sk, struct sock *parent)
772{
773 struct l2cap_pinfo *pi = l2cap_pi(sk);
774
775 BT_DBG("sk %p", sk);
776
777 if (parent) {
778 sk->sk_type = parent->sk_type;
f66dc81f
MH		 779 bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup;
780
1da177e4
LT		 781 pi->imtu = l2cap_pi(parent)->imtu;
782 pi->omtu = l2cap_pi(parent)->omtu;
c6b03cf9
MH		 783 pi->mode = l2cap_pi(parent)->mode;
784 pi->fcs = l2cap_pi(parent)->fcs;
2af6b9d5
MH		 785 pi->sec_level = l2cap_pi(parent)->sec_level;
786 pi->role_switch = l2cap_pi(parent)->role_switch;
787 pi->force_reliable = l2cap_pi(parent)->force_reliable;
1da177e4
LT		 788 } else {
789 pi->imtu = L2CAP_DEFAULT_MTU;
790 pi->omtu = 0;
c6b03cf9
MH		 791 pi->mode = L2CAP_MODE_BASIC;
792 pi->fcs = L2CAP_FCS_CRC16;
2af6b9d5
MH		 793 pi->sec_level = BT_SECURITY_LOW;
794 pi->role_switch = 0;
795 pi->force_reliable = 0;
1da177e4
LT		 796 }
797
798 /* Default config options */
5dee9e7c 799 pi->conf_len = 0;
1da177e4 800 pi->flush_to = L2CAP_DEFAULT_FLUSH_TO;
45054dc1
DY		 801 skb_queue_head_init(TX_QUEUE(sk));
802 skb_queue_head_init(SREJ_QUEUE(sk));
803 INIT_LIST_HEAD(SREJ_LIST(sk));
1da177e4
LT		 804}
805
806static struct proto l2cap_proto = {
807 .name = "L2CAP",
808 .owner = THIS_MODULE,
809 .obj_size = sizeof(struct l2cap_pinfo)
810};
811
1b8d7ae4 812static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio)
1da177e4
LT		 813{
814 struct sock *sk;
815
6257ff21 816 sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto);
1da177e4
LT		 817 if (!sk)
818 return NULL;
819
820 sock_init_data(sock, sk);
821 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
822
823 sk->sk_destruct = l2cap_sock_destruct;
4e8402a3 824 sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT);
1da177e4
LT		 825
826 sock_reset_flag(sk, SOCK_ZAPPED);
827
828 sk->sk_protocol = proto;
b1235d79 829 sk->sk_state = BT_OPEN;
1da177e4 830
b1235d79 831 setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk);
1da177e4
LT		 832
833 bt_sock_link(&l2cap_sk_list, sk);
834 return sk;
835}
836
3f378b68
EP		 837static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
838 int kern)
1da177e4
LT		 839{
840 struct sock *sk;
841
842 BT_DBG("sock %p", sock);
843
844 sock->state = SS_UNCONNECTED;
845
846 if (sock->type != SOCK_SEQPACKET &&
847 sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
848 return -ESOCKTNOSUPPORT;
849
c84b3268 850 if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
1da177e4
LT		 851 return -EPERM;
852
853 sock->ops = &l2cap_sock_ops;
854
1b8d7ae4 855 sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC);
1da177e4
LT		 856 if (!sk)
857 return -ENOMEM;
858
859 l2cap_sock_init(sk, NULL);
860 return 0;
861}
862
f29972de 863static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
1da177e4 864{
1da177e4 865 struct sock *sk = sock->sk;
f29972de
MH		 866 struct sockaddr_l2 la;
867 int len, err = 0;
1da177e4 868
f29972de 869 BT_DBG("sk %p", sk);
1da177e4
LT		 870
871 if (!addr || addr->sa_family != AF_BLUETOOTH)
872 return -EINVAL;
873
f29972de
MH		 874 memset(&la, 0, sizeof(la));
875 len = min_t(unsigned int, sizeof(la), alen);
876 memcpy(&la, addr, len);
877
2a517ca6
MH		 878 if (la.l2_cid)
879 return -EINVAL;
880
1da177e4
LT		 881 lock_sock(sk);
882
883 if (sk->sk_state != BT_OPEN) {
884 err = -EBADFD;
885 goto done;
886 }
887
b4324b5d 888 if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 &&
847641d7
MH		 889 !capable(CAP_NET_BIND_SERVICE)) {
890 err = -EACCES;
891 goto done;
892 }
8e87d142 893
1da177e4
LT		 894 write_lock_bh(&l2cap_sk_list.lock);
895
f29972de 896 if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) {
1da177e4
LT		 897 err = -EADDRINUSE;
898 } else {
899 /* Save source address */
f29972de
MH		 900 bacpy(&bt_sk(sk)->src, &la.l2_bdaddr);
901 l2cap_pi(sk)->psm = la.l2_psm;
902 l2cap_pi(sk)->sport = la.l2_psm;
1da177e4 903 sk->sk_state = BT_BOUND;
2af6b9d5 904
b4324b5d
MH		 905 if (__le16_to_cpu(la.l2_psm) == 0x0001 ||
906 __le16_to_cpu(la.l2_psm) == 0x0003)
2af6b9d5 907 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
1da177e4
LT		 908 }
909
910 write_unlock_bh(&l2cap_sk_list.lock);
911
912done:
913 release_sock(sk);
914 return err;
915}
916
917static int l2cap_do_connect(struct sock *sk)
918{
919 bdaddr_t *src = &bt_sk(sk)->src;
920 bdaddr_t *dst = &bt_sk(sk)->dst;
921 struct l2cap_conn *conn;
922 struct hci_conn *hcon;
923 struct hci_dev *hdev;
09ab6f4c 924 __u8 auth_type;
44d0e48e 925 int err;
1da177e4 926
f29972de
MH		 927 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
928 l2cap_pi(sk)->psm);
1da177e4 929
af05b30b
GP		 930 hdev = hci_get_route(dst, src);
931 if (!hdev)
1da177e4
LT		 932 return -EHOSTUNREACH;
933
934 hci_dev_lock_bh(hdev);
935
936 err = -ENOMEM;
937
8c1b2355 938 if (sk->sk_type == SOCK_RAW) {
2af6b9d5
MH		 939 switch (l2cap_pi(sk)->sec_level) {
940 case BT_SECURITY_HIGH:
8c1b2355 941 auth_type = HCI_AT_DEDICATED_BONDING_MITM;
2af6b9d5
MH		 942 break;
943 case BT_SECURITY_MEDIUM:
8c1b2355 944 auth_type = HCI_AT_DEDICATED_BONDING;
2af6b9d5
MH		 945 break;
946 default:
09ab6f4c 947 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 948 break;
949 }
8c1b2355 950 } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) {
2af6b9d5 951 if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
8c1b2355 952 auth_type = HCI_AT_NO_BONDING_MITM;
09ab6f4c 953 else
8c1b2355 954 auth_type = HCI_AT_NO_BONDING;
435fef20
MH		 955
956 if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW)
957 l2cap_pi(sk)->sec_level = BT_SECURITY_SDP;
8c1b2355 958 } else {
2af6b9d5
MH		 959 switch (l2cap_pi(sk)->sec_level) {
960 case BT_SECURITY_HIGH:
8c1b2355 961 auth_type = HCI_AT_GENERAL_BONDING_MITM;
2af6b9d5
MH		 962 break;
963 case BT_SECURITY_MEDIUM:
09ab6f4c 964 auth_type = HCI_AT_GENERAL_BONDING;
2af6b9d5
MH		 965 break;
966 default:
8c1b2355 967 auth_type = HCI_AT_NO_BONDING;
2af6b9d5
MH		 968 break;
969 }
09ab6f4c
MH		 970 }
971
2af6b9d5
MH		 972 hcon = hci_connect(hdev, ACL_LINK, dst,
973 l2cap_pi(sk)->sec_level, auth_type);
1da177e4
LT		 974 if (!hcon)
975 goto done;
976
977 conn = l2cap_conn_add(hcon, 0);
978 if (!conn) {
979 hci_conn_put(hcon);
980 goto done;
981 }
982
983 err = 0;
984
985 /* Update source addr of the socket */
986 bacpy(src, conn->src);
987
988 l2cap_chan_add(conn, sk, NULL);
989
990 sk->sk_state = BT_CONNECT;
991 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
992
993 if (hcon->state == BT_CONNECTED) {
79d554a6 994 if (sk->sk_type != SOCK_SEQPACKET) {
1da177e4
LT		 995 l2cap_sock_clear_timer(sk);
996 sk->sk_state = BT_CONNECTED;
79d554a6
MH		 997 } else
998 l2cap_do_start(sk);
1da177e4
LT		 999 }
1000
1001done:
1002 hci_dev_unlock_bh(hdev);
1003 hci_dev_put(hdev);
1004 return err;
1005}
1006
1007static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags)
1008{
1da177e4 1009 struct sock *sk = sock->sk;
f29972de
MH		 1010 struct sockaddr_l2 la;
1011 int len, err = 0;
1da177e4 1012
1da177e4
LT		 1013 BT_DBG("sk %p", sk);
1014
6503d961
CG		 1015 if (!addr || alen < sizeof(addr->sa_family) ||
1016 addr->sa_family != AF_BLUETOOTH)
2a517ca6 1017 return -EINVAL;
1da177e4 1018
f29972de
MH		 1019 memset(&la, 0, sizeof(la));
1020 len = min_t(unsigned int, sizeof(la), alen);
1021 memcpy(&la, addr, len);
1022
2a517ca6
MH		 1023 if (la.l2_cid)
1024 return -EINVAL;
1025
1026 lock_sock(sk);
1027
f29972de 1028 if (sk->sk_type == SOCK_SEQPACKET && !la.l2_psm) {
1da177e4
LT		 1029 err = -EINVAL;
1030 goto done;
1031 }
1032
c6b03cf9
MH		 1033 switch (l2cap_pi(sk)->mode) {
1034 case L2CAP_MODE_BASIC:
1035 break;
1036 case L2CAP_MODE_ERTM:
f2fcfcd6 1037 case L2CAP_MODE_STREAMING:
c6b03cf9
MH		 1038 if (enable_ertm)
1039 break;
1040 /* fall through */
1041 default:
1042 err = -ENOTSUPP;
1043 goto done;
1044 }
1045
af05b30b 1046 switch (sk->sk_state) {
1da177e4
LT		 1047 case BT_CONNECT:
1048 case BT_CONNECT2:
1049 case BT_CONFIG:
1050 /* Already connecting */
1051 goto wait;
1052
1053 case BT_CONNECTED:
1054 /* Already connected */
1055 goto done;
1056
1057 case BT_OPEN:
1058 case BT_BOUND:
1059 /* Can connect */
1060 break;
1061
1062 default:
1063 err = -EBADFD;
1064 goto done;
1065 }
1066
1067 /* Set destination address and psm */
f29972de
MH		 1068 bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr);
1069 l2cap_pi(sk)->psm = la.l2_psm;
1da177e4 1070
af05b30b
GP		 1071 err = l2cap_do_connect(sk);
1072 if (err)
1da177e4
LT		 1073 goto done;
1074
1075wait:
1076 err = bt_sock_wait_state(sk, BT_CONNECTED,
1077 sock_sndtimeo(sk, flags & O_NONBLOCK));
1078done:
1079 release_sock(sk);
1080 return err;
1081}
1082
1083static int l2cap_sock_listen(struct socket *sock, int backlog)
1084{
1085 struct sock *sk = sock->sk;
1086 int err = 0;
1087
1088 BT_DBG("sk %p backlog %d", sk, backlog);
1089
1090 lock_sock(sk);
1091
1092 if (sk->sk_state != BT_BOUND || sock->type != SOCK_SEQPACKET) {
1093 err = -EBADFD;
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
1da177e4
LT		 1110 if (!l2cap_pi(sk)->psm) {
1111 bdaddr_t *src = &bt_sk(sk)->src;
1112 u16 psm;
1113
1114 err = -EINVAL;
1115
1116 write_lock_bh(&l2cap_sk_list.lock);
1117
1118 for (psm = 0x1001; psm < 0x1100; psm += 2)
b4324b5d
MH		 1119 if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) {
1120 l2cap_pi(sk)->psm = cpu_to_le16(psm);
1121 l2cap_pi(sk)->sport = cpu_to_le16(psm);
1da177e4
LT		 1122 err = 0;
1123 break;
1124 }
1125
1126 write_unlock_bh(&l2cap_sk_list.lock);
1127
1128 if (err < 0)
1129 goto done;
1130 }
1131
1132 sk->sk_max_ack_backlog = backlog;
1133 sk->sk_ack_backlog = 0;
1134 sk->sk_state = BT_LISTEN;
1135
1136done:
1137 release_sock(sk);
1138 return err;
1139}
1140
1141static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags)
1142{
1143 DECLARE_WAITQUEUE(wait, current);
1144 struct sock *sk = sock->sk, *nsk;
1145 long timeo;
1146 int err = 0;
1147
fcc70d5f 1148 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1149
1150 if (sk->sk_state != BT_LISTEN) {
1151 err = -EBADFD;
1152 goto done;
1153 }
1154
1155 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1156
1157 BT_DBG("sk %p timeo %ld", sk, timeo);
1158
1159 /* Wait for an incoming connection. (wake-one). */
aa395145 1160 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1da177e4
LT		 1161 while (!(nsk = bt_accept_dequeue(sk, newsock))) {
1162 set_current_state(TASK_INTERRUPTIBLE);
1163 if (!timeo) {
1164 err = -EAGAIN;
1165 break;
1166 }
1167
1168 release_sock(sk);
1169 timeo = schedule_timeout(timeo);
fcc70d5f 1170 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
1da177e4
LT		 1171
1172 if (sk->sk_state != BT_LISTEN) {
1173 err = -EBADFD;
1174 break;
1175 }
1176
1177 if (signal_pending(current)) {
1178 err = sock_intr_errno(timeo);
1179 break;
1180 }
1181 }
1182 set_current_state(TASK_RUNNING);
aa395145 1183 remove_wait_queue(sk_sleep(sk), &wait);
1da177e4
LT		 1184
1185 if (err)
1186 goto done;
1187
1188 newsock->state = SS_CONNECTED;
1189
1190 BT_DBG("new socket %p", nsk);
1191
1192done:
1193 release_sock(sk);
1194 return err;
1195}
1196
1197static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer)
1198{
1199 struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr;
1200 struct sock *sk = sock->sk;
1201
1202 BT_DBG("sock %p, sk %p", sock, sk);
1203
1204 addr->sa_family = AF_BLUETOOTH;
1205 *len = sizeof(struct sockaddr_l2);
1206
f29972de
MH		 1207 if (peer) {
1208 la->l2_psm = l2cap_pi(sk)->psm;
1da177e4 1209 bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst);
b4324b5d 1210 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid);
f29972de
MH		 1211 } else {
1212 la->l2_psm = l2cap_pi(sk)->sport;
1da177e4 1213 bacpy(&la->l2_bdaddr, &bt_sk(sk)->src);
b4324b5d 1214 la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid);
f29972de 1215 }
1da177e4 1216
1da177e4
LT		 1217 return 0;
1218}
1219
e90bac06
GP		 1220static void l2cap_monitor_timeout(unsigned long arg)
1221{
1222 struct sock *sk = (void *) arg;
1223 u16 control;
1224
e686219a 1225 bh_lock_sock(sk);
e90bac06
GP		 1226 if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) {
1227 l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk);
b13f5860 1228 bh_unlock_sock(sk);
e90bac06
GP		 1229 return;
1230 }
1231
1232 l2cap_pi(sk)->retry_count++;
1233 __mod_monitor_timer();
1234
1235 control = L2CAP_CTRL_POLL;
7e743090 1236 l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
e686219a 1237 bh_unlock_sock(sk);
e90bac06
GP		 1238}
1239
1240static void l2cap_retrans_timeout(unsigned long arg)
1241{
1242 struct sock *sk = (void *) arg;
1243 u16 control;
1244
e686219a 1245 bh_lock_sock(sk);
e90bac06
GP		 1246 l2cap_pi(sk)->retry_count = 1;
1247 __mod_monitor_timer();
1248
1249 l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F;
1250
1251 control = L2CAP_CTRL_POLL;
7e743090 1252 l2cap_send_rr_or_rnr(l2cap_pi(sk), control);
e686219a 1253 bh_unlock_sock(sk);
e90bac06
GP		 1254}
1255
1c2acffb 1256static void l2cap_drop_acked_frames(struct sock *sk)
1da177e4 1257{
1c2acffb 1258 struct sk_buff *skb;
1da177e4 1259
1c2acffb
GP		 1260 while ((skb = skb_peek(TX_QUEUE(sk)))) {
1261 if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq)
1262 break;
1da177e4 1263
1c2acffb
GP		 1264 skb = skb_dequeue(TX_QUEUE(sk));
1265 kfree_skb(skb);
1da177e4 1266
1c2acffb
GP		 1267 l2cap_pi(sk)->unacked_frames--;
1268 }
1da177e4 1269
e90bac06
GP		 1270 if (!l2cap_pi(sk)->unacked_frames)
1271 del_timer(&l2cap_pi(sk)->retrans_timer);
1272
1c2acffb
GP		 1273 return;
1274}
1da177e4 1275
1c2acffb
GP		 1276static inline int l2cap_do_send(struct sock *sk, struct sk_buff *skb)
1277{
1278 struct l2cap_pinfo *pi = l2cap_pi(sk);
1279 int err;
1280
1281 BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len);
1da177e4 1282
1c2acffb
GP		 1283 err = hci_send_acl(pi->conn->hcon, skb, 0);
1284 if (err < 0)
1285 kfree_skb(skb);
1286
1287 return err;
1288}
1289
6840ed07
GP		 1290static int l2cap_streaming_send(struct sock *sk)
1291{
1292 struct sk_buff *skb, *tx_skb;
1293 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1294 u16 control, fcs;
6840ed07
GP		 1295 int err;
1296
1297 while ((skb = sk->sk_send_head)) {
1298 tx_skb = skb_clone(skb, GFP_ATOMIC);
1299
1300 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1301 control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
1302 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1303
e8235c6b 1304 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1305 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1306 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1307 }
1308
6840ed07
GP		 1309 err = l2cap_do_send(sk, tx_skb);
1310 if (err < 0) {
1311 l2cap_send_disconn_req(pi->conn, sk);
1312 return err;
1313 }
1314
1315 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1316
1317 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1318 sk->sk_send_head = NULL;
1319 else
1320 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
1321
1322 skb = skb_dequeue(TX_QUEUE(sk));
1323 kfree_skb(skb);
1324 }
1325 return 0;
1326}
1327
8f17154f
GP		 1328static int l2cap_retransmit_frame(struct sock *sk, u8 tx_seq)
1329{
1330 struct l2cap_pinfo *pi = l2cap_pi(sk);
1331 struct sk_buff *skb, *tx_skb;
1332 u16 control, fcs;
1333 int err;
1334
1335 skb = skb_peek(TX_QUEUE(sk));
1336 do {
1337 if (bt_cb(skb)->tx_seq != tx_seq) {
1338 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1339 break;
1340 skb = skb_queue_next(TX_QUEUE(sk), skb);
1341 continue;
1342 }
1343
1344 if (pi->remote_max_tx &&
1345 bt_cb(skb)->retries == pi->remote_max_tx) {
1346 l2cap_send_disconn_req(pi->conn, sk);
1347 break;
1348 }
1349
1350 tx_skb = skb_clone(skb, GFP_ATOMIC);
1351 bt_cb(skb)->retries++;
1352 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
9f121a5a 1353 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
8f17154f
GP		 1354 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1355 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1356
e8235c6b 1357 if (pi->fcs == L2CAP_FCS_CRC16) {
8f17154f
GP		 1358 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1359 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1360 }
1361
1362 err = l2cap_do_send(sk, tx_skb);
1363 if (err < 0) {
1364 l2cap_send_disconn_req(pi->conn, sk);
1365 return err;
1366 }
1367 break;
1368 } while(1);
1369 return 0;
1370}
1371
1c2acffb
GP		 1372static int l2cap_ertm_send(struct sock *sk)
1373{
1374 struct sk_buff *skb, *tx_skb;
1375 struct l2cap_pinfo *pi = l2cap_pi(sk);
fcc203c3 1376 u16 control, fcs;
9e917af1 1377 int err, nsent = 0;
1c2acffb 1378
e90bac06
GP		 1379 if (pi->conn_state & L2CAP_CONN_WAIT_F)
1380 return 0;
1381
f64f9e71
JP		 1382 while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk)) &&
1383 !(pi->conn_state & L2CAP_CONN_REMOTE_BUSY)) {
1c2acffb 1384
e90bac06
GP		 1385 if (pi->remote_max_tx &&
1386 bt_cb(skb)->retries == pi->remote_max_tx) {
1387 l2cap_send_disconn_req(pi->conn, sk);
1388 break;
1389 }
1390
e420aba3
AE		 1391 tx_skb = skb_clone(skb, GFP_ATOMIC);
1392
e90bac06
GP		 1393 bt_cb(skb)->retries++;
1394
1c2acffb 1395 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
d5392c8f
GP		 1396 if (pi->conn_state & L2CAP_CONN_SEND_FBIT) {
1397 control |= L2CAP_CTRL_FINAL;
1398 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1399 }
9f121a5a 1400 control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1c2acffb
GP		 1401 | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1402 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1403
e90bac06 1404
e8235c6b 1405 if (pi->fcs == L2CAP_FCS_CRC16) {
fcc203c3
GP		 1406 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1407 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1408 }
1409
1c2acffb
GP		 1410 err = l2cap_do_send(sk, tx_skb);
1411 if (err < 0) {
1412 l2cap_send_disconn_req(pi->conn, sk);
1413 return err;
1414 }
e90bac06 1415 __mod_retrans_timer();
1c2acffb
GP		 1416
1417 bt_cb(skb)->tx_seq = pi->next_tx_seq;
1418 pi->next_tx_seq = (pi->next_tx_seq + 1) % 64;
1419
1420 pi->unacked_frames++;
d5392c8f 1421 pi->frames_sent++;
1c2acffb
GP		 1422
1423 if (skb_queue_is_last(TX_QUEUE(sk), skb))
1424 sk->sk_send_head = NULL;
1425 else
1426 sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb);
9e917af1
GP		 1427
1428 nsent++;
1c2acffb
GP		 1429 }
1430
9e917af1
GP		 1431 return nsent;
1432}
1433
1434static int l2cap_send_ack(struct l2cap_pinfo *pi)
1435{
1436 struct sock *sk = (struct sock *)pi;
1437 u16 control = 0;
1438
1439 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1440
1441 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1442 control |= L2CAP_SUPER_RCV_NOT_READY;
1443 return l2cap_send_sframe(pi, control);
1444 } else if (l2cap_ertm_send(sk) == 0) {
1445 control |= L2CAP_SUPER_RCV_READY;
1446 return l2cap_send_sframe(pi, control);
1447 }
1c2acffb
GP		 1448 return 0;
1449}
1450
99b0d4b7
GP		 1451static int l2cap_send_srejtail(struct sock *sk)
1452{
1453 struct srej_list *tail;
1454 u16 control;
1455
1456 control = L2CAP_SUPER_SELECT_REJECT;
1457 control |= L2CAP_CTRL_FINAL;
1458
1459 tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list);
1460 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1461
1462 l2cap_send_sframe(l2cap_pi(sk), control);
1463
1464 return 0;
1465}
1466
1c2acffb
GP		 1467static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1468{
1469 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1470 struct sk_buff **frag;
1471 int err, sent = 0;
1da177e4
LT		 1472
1473 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) {
1c2acffb 1474 return -EFAULT;
1da177e4
LT		 1475 }
1476
1477 sent += count;
1478 len -= count;
1479
1480 /* Continuation fragments (no L2CAP header) */
1481 frag = &skb_shinfo(skb)->frag_list;
1482 while (len) {
1483 count = min_t(unsigned int, conn->mtu, len);
1484
1485 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1486 if (!*frag)
1c2acffb
GP		 1487 return -EFAULT;
1488 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1489 return -EFAULT;
1da177e4
LT		 1490
1491 sent += count;
1492 len -= count;
1493
1494 frag = &(*frag)->next;
1495 }
1da177e4
LT		 1496
1497 return sent;
1c2acffb 1498}
1da177e4 1499
1c2acffb
GP		 1500static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1501{
1502 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1503 struct sk_buff *skb;
1504 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1505 struct l2cap_hdr *lh;
1506
1507 BT_DBG("sk %p len %d", sk, (int)len);
1508
1509 count = min_t(unsigned int, (conn->mtu - hlen), len);
1510 skb = bt_skb_send_alloc(sk, count + hlen,
1511 msg->msg_flags & MSG_DONTWAIT, &err);
1512 if (!skb)
1513 return ERR_PTR(-ENOMEM);
1514
1515 /* Create L2CAP header */
1516 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1517 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1518 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1519 put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2));
1520
1521 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1522 if (unlikely(err < 0)) {
1523 kfree_skb(skb);
1524 return ERR_PTR(err);
1525 }
1526 return skb;
1527}
1528
1529static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len)
1530{
1531 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1532 struct sk_buff *skb;
1533 int err, count, hlen = L2CAP_HDR_SIZE;
1534 struct l2cap_hdr *lh;
1535
1536 BT_DBG("sk %p len %d", sk, (int)len);
1537
1538 count = min_t(unsigned int, (conn->mtu - hlen), len);
1539 skb = bt_skb_send_alloc(sk, count + hlen,
1540 msg->msg_flags & MSG_DONTWAIT, &err);
1541 if (!skb)
1542 return ERR_PTR(-ENOMEM);
1543
1544 /* Create L2CAP header */
1545 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1546 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1547 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1548
1549 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1550 if (unlikely(err < 0)) {
1551 kfree_skb(skb);
1552 return ERR_PTR(err);
1553 }
1554 return skb;
1555}
1556
6840ed07 1557static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1c2acffb
GP		 1558{
1559 struct l2cap_conn *conn = l2cap_pi(sk)->conn;
1560 struct sk_buff *skb;
1561 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1562 struct l2cap_hdr *lh;
1563
1564 BT_DBG("sk %p len %d", sk, (int)len);
1565
c74e560c
GP		 1566 if (sdulen)
1567 hlen += 2;
1568
fcc203c3
GP		 1569 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1570 hlen += 2;
1571
1c2acffb
GP		 1572 count = min_t(unsigned int, (conn->mtu - hlen), len);
1573 skb = bt_skb_send_alloc(sk, count + hlen,
1574 msg->msg_flags & MSG_DONTWAIT, &err);
1575 if (!skb)
1576 return ERR_PTR(-ENOMEM);
1577
1578 /* Create L2CAP header */
1579 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1580 lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid);
1581 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1582 put_unaligned_le16(control, skb_put(skb, 2));
c74e560c
GP		 1583 if (sdulen)
1584 put_unaligned_le16(sdulen, skb_put(skb, 2));
1c2acffb
GP		 1585
1586 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1587 if (unlikely(err < 0)) {
1588 kfree_skb(skb);
1589 return ERR_PTR(err);
1590 }
e90bac06 1591
fcc203c3
GP		 1592 if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16)
1593 put_unaligned_le16(0, skb_put(skb, 2));
1594
e90bac06 1595 bt_cb(skb)->retries = 0;
1c2acffb 1596 return skb;
1da177e4
LT		 1597}
1598
c74e560c
GP		 1599static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len)
1600{
1601 struct l2cap_pinfo *pi = l2cap_pi(sk);
1602 struct sk_buff *skb;
1603 struct sk_buff_head sar_queue;
1604 u16 control;
1605 size_t size = 0;
1606
1607 __skb_queue_head_init(&sar_queue);
1608 control = L2CAP_SDU_START;
6840ed07 1609 skb = l2cap_create_iframe_pdu(sk, msg, pi->max_pdu_size, control, len);
c74e560c
GP		 1610 if (IS_ERR(skb))
1611 return PTR_ERR(skb);
1612
1613 __skb_queue_tail(&sar_queue, skb);
1614 len -= pi->max_pdu_size;
1615 size +=pi->max_pdu_size;
1616 control = 0;
1617
1618 while (len > 0) {
1619 size_t buflen;
1620
1621 if (len > pi->max_pdu_size) {
1622 control |= L2CAP_SDU_CONTINUE;
1623 buflen = pi->max_pdu_size;
1624 } else {
1625 control |= L2CAP_SDU_END;
1626 buflen = len;
1627 }
1628
6840ed07 1629 skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0);
c74e560c
GP		 1630 if (IS_ERR(skb)) {
1631 skb_queue_purge(&sar_queue);
1632 return PTR_ERR(skb);
1633 }
1634
1635 __skb_queue_tail(&sar_queue, skb);
1636 len -= buflen;
1637 size += buflen;
1638 control = 0;
1639 }
1640 skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk));
1641 if (sk->sk_send_head == NULL)
1642 sk->sk_send_head = sar_queue.next;
1643
1644 return size;
1645}
1646
1da177e4
LT		 1647static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len)
1648{
1649 struct sock *sk = sock->sk;
1c2acffb
GP		 1650 struct l2cap_pinfo *pi = l2cap_pi(sk);
1651 struct sk_buff *skb;
1652 u16 control;
1653 int err;
1da177e4
LT		 1654
1655 BT_DBG("sock %p, sk %p", sock, sk);
1656
c1cbe4b7
BL		 1657 err = sock_error(sk);
1658 if (err)
1659 return err;
1da177e4
LT		 1660
1661 if (msg->msg_flags & MSG_OOB)
1662 return -EOPNOTSUPP;
1663
1da177e4
LT		 1664 lock_sock(sk);
1665
1c2acffb 1666 if (sk->sk_state != BT_CONNECTED) {
1da177e4 1667 err = -ENOTCONN;
1c2acffb
GP		 1668 goto done;
1669 }
1da177e4 1670
1c2acffb
GP		 1671 /* Connectionless channel */
1672 if (sk->sk_type == SOCK_DGRAM) {
1673 skb = l2cap_create_connless_pdu(sk, msg, len);
477fffb0
DC		 1674 if (IS_ERR(skb))
1675 err = PTR_ERR(skb);
1676 else
1677 err = l2cap_do_send(sk, skb);
1c2acffb
GP		 1678 goto done;
1679 }
1680
1681 switch (pi->mode) {
1682 case L2CAP_MODE_BASIC:
c69163e9
GP		 1683 /* Check outgoing MTU */
1684 if (len > pi->omtu) {
1685 err = -EINVAL;
1686 goto done;
1687 }
1688
1c2acffb
GP		 1689 /* Create a basic PDU */
1690 skb = l2cap_create_basic_pdu(sk, msg, len);
1691 if (IS_ERR(skb)) {
1692 err = PTR_ERR(skb);
1693 goto done;
1694 }
1695
1696 err = l2cap_do_send(sk, skb);
1697 if (!err)
1698 err = len;
1699 break;
1700
1701 case L2CAP_MODE_ERTM:
6840ed07 1702 case L2CAP_MODE_STREAMING:
1c2acffb 1703 /* Entire SDU fits into one PDU */
c74e560c 1704 if (len <= pi->max_pdu_size) {
1c2acffb 1705 control = L2CAP_SDU_UNSEGMENTED;
6840ed07 1706 skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0);
1c2acffb
GP		 1707 if (IS_ERR(skb)) {
1708 err = PTR_ERR(skb);
1709 goto done;
1710 }
c74e560c
GP		 1711 __skb_queue_tail(TX_QUEUE(sk), skb);
1712 if (sk->sk_send_head == NULL)
1713 sk->sk_send_head = skb;
1c2acffb 1714 } else {
c74e560c
GP		 1715 /* Segment SDU into multiples PDUs */
1716 err = l2cap_sar_segment_sdu(sk, msg, len);
1717 if (err < 0)
1718 goto done;
1c2acffb 1719 }
1c2acffb 1720
6840ed07
GP		 1721 if (pi->mode == L2CAP_MODE_STREAMING)
1722 err = l2cap_streaming_send(sk);
1723 else
1724 err = l2cap_ertm_send(sk);
1725
9e917af1 1726 if (err >= 0)
1c2acffb
GP		 1727 err = len;
1728 break;
1729
1730 default:
1731 BT_DBG("bad state %1.1x", pi->mode);
1732 err = -EINVAL;
1733 }
1734
1735done:
1da177e4
LT		 1736 release_sock(sk);
1737 return err;
1738}
1739
f66dc81f
MH		 1740static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags)
1741{
1742 struct sock *sk = sock->sk;
1743
1744 lock_sock(sk);
1745
1746 if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) {
1747 struct l2cap_conn_rsp rsp;
1748
1749 sk->sk_state = BT_CONFIG;
1750
1751 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1752 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
1753 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1754 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1755 l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident,
1756 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
1757
1758 release_sock(sk);
1759 return 0;
1760 }
1761
1762 release_sock(sk);
1763
1764 return bt_sock_recvmsg(iocb, sock, msg, len, flags);
1765}
1766
b7058842 1767static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen)
1da177e4
LT		 1768{
1769 struct sock *sk = sock->sk;
1770 struct l2cap_options opts;
f29972de 1771 int len, err = 0;
1da177e4
LT		 1772 u32 opt;
1773
1774 BT_DBG("sk %p", sk);
1775
1776 lock_sock(sk);
1777
1778 switch (optname) {
1779 case L2CAP_OPTIONS:
0878b666
MH		 1780 opts.imtu = l2cap_pi(sk)->imtu;
1781 opts.omtu = l2cap_pi(sk)->omtu;
1782 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 1783 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 1784 opts.fcs = l2cap_pi(sk)->fcs;
0878b666 1785
1da177e4
LT		 1786 len = min_t(unsigned int, sizeof(opts), optlen);
1787 if (copy_from_user((char *) &opts, optval, len)) {
1788 err = -EFAULT;
1789 break;
1790 }
0878b666 1791
c6b03cf9
MH		 1792 l2cap_pi(sk)->imtu = opts.imtu;
1793 l2cap_pi(sk)->omtu = opts.omtu;
1794 l2cap_pi(sk)->mode = opts.mode;
fcc203c3 1795 l2cap_pi(sk)->fcs = opts.fcs;
1da177e4
LT		 1796 break;
1797
1798 case L2CAP_LM:
1799 if (get_user(opt, (u32 __user *) optval)) {
1800 err = -EFAULT;
1801 break;
1802 }
1803
2af6b9d5
MH		 1804 if (opt & L2CAP_LM_AUTH)
1805 l2cap_pi(sk)->sec_level = BT_SECURITY_LOW;
1806 if (opt & L2CAP_LM_ENCRYPT)
1807 l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM;
1808 if (opt & L2CAP_LM_SECURE)
1809 l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH;
1810
1811 l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER);
1812 l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE);
1da177e4
LT		 1813 break;
1814
1815 default:
1816 err = -ENOPROTOOPT;
1817 break;
1818 }
1819
1820 release_sock(sk);
1821 return err;
1822}
1823
b7058842 1824static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen)
d58daf42
MH		 1825{
1826 struct sock *sk = sock->sk;
2af6b9d5
MH		 1827 struct bt_security sec;
1828 int len, err = 0;
f66dc81f 1829 u32 opt;
d58daf42
MH		 1830
1831 BT_DBG("sk %p", sk);
1832
1833 if (level == SOL_L2CAP)
1834 return l2cap_sock_setsockopt_old(sock, optname, optval, optlen);
1835
0588d94f
MH		 1836 if (level != SOL_BLUETOOTH)
1837 return -ENOPROTOOPT;
1838
d58daf42
MH		 1839 lock_sock(sk);
1840
1841 switch (optname) {
2af6b9d5 1842 case BT_SECURITY:
2526d3d8 1843 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 1844 err = -EINVAL;
1845 break;
1846 }
1847
2af6b9d5
MH		 1848 sec.level = BT_SECURITY_LOW;
1849
1850 len = min_t(unsigned int, sizeof(sec), optlen);
1851 if (copy_from_user((char *) &sec, optval, len)) {
1852 err = -EFAULT;
1853 break;
1854 }
1855
1856 if (sec.level < BT_SECURITY_LOW ||
1857 sec.level > BT_SECURITY_HIGH) {
1858 err = -EINVAL;
1859 break;
1860 }
1861
1862 l2cap_pi(sk)->sec_level = sec.level;
1863 break;
1864
f66dc81f
MH		 1865 case BT_DEFER_SETUP:
1866 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1867 err = -EINVAL;
1868 break;
1869 }
1870
1871 if (get_user(opt, (u32 __user *) optval)) {
1872 err = -EFAULT;
1873 break;
1874 }
1875
1876 bt_sk(sk)->defer_setup = opt;
1877 break;
1878
d58daf42
MH		 1879 default:
1880 err = -ENOPROTOOPT;
1881 break;
1882 }
1883
1884 release_sock(sk);
1885 return err;
1886}
1887
1888static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen)
1da177e4
LT		 1889{
1890 struct sock *sk = sock->sk;
1891 struct l2cap_options opts;
1892 struct l2cap_conninfo cinfo;
1893 int len, err = 0;
2af6b9d5 1894 u32 opt;
1da177e4
LT		 1895
1896 BT_DBG("sk %p", sk);
1897
1898 if (get_user(len, optlen))
1899 return -EFAULT;
1900
1901 lock_sock(sk);
1902
1903 switch (optname) {
1904 case L2CAP_OPTIONS:
1905 opts.imtu = l2cap_pi(sk)->imtu;
1906 opts.omtu = l2cap_pi(sk)->omtu;
1907 opts.flush_to = l2cap_pi(sk)->flush_to;
c6b03cf9 1908 opts.mode = l2cap_pi(sk)->mode;
fcc203c3 1909 opts.fcs = l2cap_pi(sk)->fcs;
1da177e4
LT		 1910
1911 len = min_t(unsigned int, len, sizeof(opts));
1912 if (copy_to_user(optval, (char *) &opts, len))
1913 err = -EFAULT;
1914
1915 break;
1916
1917 case L2CAP_LM:
2af6b9d5
MH		 1918 switch (l2cap_pi(sk)->sec_level) {
1919 case BT_SECURITY_LOW:
1920 opt = L2CAP_LM_AUTH;
1921 break;
1922 case BT_SECURITY_MEDIUM:
1923 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT;
1924 break;
1925 case BT_SECURITY_HIGH:
1926 opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT |
1927 L2CAP_LM_SECURE;
1928 break;
1929 default:
1930 opt = 0;
1931 break;
1932 }
1933
1934 if (l2cap_pi(sk)->role_switch)
1935 opt |= L2CAP_LM_MASTER;
1936
1937 if (l2cap_pi(sk)->force_reliable)
1938 opt |= L2CAP_LM_RELIABLE;
1939
1940 if (put_user(opt, (u32 __user *) optval))
1da177e4
LT		 1941 err = -EFAULT;
1942 break;
1943
1944 case L2CAP_CONNINFO:
f66dc81f
MH		 1945 if (sk->sk_state != BT_CONNECTED &&
1946 !(sk->sk_state == BT_CONNECT2 &&
1947 bt_sk(sk)->defer_setup)) {
1da177e4
LT		 1948 err = -ENOTCONN;
1949 break;
1950 }
1951
1952 cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle;
1953 memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3);
1954
1955 len = min_t(unsigned int, len, sizeof(cinfo));
1956 if (copy_to_user(optval, (char *) &cinfo, len))
1957 err = -EFAULT;
1958
1959 break;
1960
1961 default:
1962 err = -ENOPROTOOPT;
1963 break;
1964 }
1965
1966 release_sock(sk);
1967 return err;
1968}
1969
d58daf42
MH		 1970static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen)
1971{
1972 struct sock *sk = sock->sk;
2af6b9d5 1973 struct bt_security sec;
d58daf42
MH		 1974 int len, err = 0;
1975
1976 BT_DBG("sk %p", sk);
1977
1978 if (level == SOL_L2CAP)
1979 return l2cap_sock_getsockopt_old(sock, optname, optval, optlen);
1980
0588d94f
MH		 1981 if (level != SOL_BLUETOOTH)
1982 return -ENOPROTOOPT;
1983
d58daf42
MH		 1984 if (get_user(len, optlen))
1985 return -EFAULT;
1986
1987 lock_sock(sk);
1988
1989 switch (optname) {
2af6b9d5 1990 case BT_SECURITY:
2526d3d8 1991 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_RAW) {
0588d94f
MH		 1992 err = -EINVAL;
1993 break;
1994 }
1995
2af6b9d5
MH		 1996 sec.level = l2cap_pi(sk)->sec_level;
1997
1998 len = min_t(unsigned int, len, sizeof(sec));
1999 if (copy_to_user(optval, (char *) &sec, len))
2000 err = -EFAULT;
2001
2002 break;
2003
f66dc81f
MH		 2004 case BT_DEFER_SETUP:
2005 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
2006 err = -EINVAL;
2007 break;
2008 }
2009
2010 if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval))
2011 err = -EFAULT;
2012
2013 break;
2014
d58daf42
MH		 2015 default:
2016 err = -ENOPROTOOPT;
2017 break;
2018 }
2019
2020 release_sock(sk);
2021 return err;
2022}
2023
1da177e4
LT		 2024static int l2cap_sock_shutdown(struct socket *sock, int how)
2025{
2026 struct sock *sk = sock->sk;
2027 int err = 0;
2028
2029 BT_DBG("sock %p, sk %p", sock, sk);
2030
2031 if (!sk)
2032 return 0;
2033
2034 lock_sock(sk);
2035 if (!sk->sk_shutdown) {
2036 sk->sk_shutdown = SHUTDOWN_MASK;
2037 l2cap_sock_clear_timer(sk);
2038 __l2cap_sock_close(sk, 0);
2039
2040 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
b1235d79
MH		 2041 err = bt_sock_wait_state(sk, BT_CLOSED,
2042 sk->sk_lingertime);
1da177e4
LT		 2043 }
2044 release_sock(sk);
2045 return err;
2046}
2047
2048static int l2cap_sock_release(struct socket *sock)
2049{
2050 struct sock *sk = sock->sk;
2051 int err;
2052
2053 BT_DBG("sock %p, sk %p", sock, sk);
2054
2055 if (!sk)
2056 return 0;
2057
2058 err = l2cap_sock_shutdown(sock, 2);
2059
2060 sock_orphan(sk);
2061 l2cap_sock_kill(sk);
2062 return err;
2063}
2064
1da177e4
LT		 2065static void l2cap_chan_ready(struct sock *sk)
2066{
2067 struct sock *parent = bt_sk(sk)->parent;
2068
2069 BT_DBG("sk %p, parent %p", sk, parent);
2070
2071 l2cap_pi(sk)->conf_state = 0;
2072 l2cap_sock_clear_timer(sk);
2073
2074 if (!parent) {
2075 /* Outgoing channel.
2076 * Wake up socket sleeping on connect.
2077 */
2078 sk->sk_state = BT_CONNECTED;
2079 sk->sk_state_change(sk);
2080 } else {
2081 /* Incoming channel.
2082 * Wake up socket sleeping on accept.
2083 */
2084 parent->sk_data_ready(parent, 0);
2085 }
2086}
2087
2088/* Copy frame to all raw sockets on that connection */
2089static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2090{
2091 struct l2cap_chan_list *l = &conn->chan_list;
2092 struct sk_buff *nskb;
af05b30b 2093 struct sock *sk;
1da177e4
LT		 2094
2095 BT_DBG("conn %p", conn);
2096
2097 read_lock(&l->lock);
2098 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
2099 if (sk->sk_type != SOCK_RAW)
2100 continue;
2101
2102 /* Don't send frame to the socket it came from */
2103 if (skb->sk == sk)
2104 continue;
af05b30b
GP		 2105 nskb = skb_clone(skb, GFP_ATOMIC);
2106 if (!nskb)
1da177e4
LT		 2107 continue;
2108
2109 if (sock_queue_rcv_skb(sk, nskb))
2110 kfree_skb(nskb);
2111 }
2112 read_unlock(&l->lock);
2113}
2114
2115/* ---- L2CAP signalling commands ---- */
2116static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
2117 u8 code, u8 ident, u16 dlen, void *data)
2118{
2119 struct sk_buff *skb, **frag;
2120 struct l2cap_cmd_hdr *cmd;
2121 struct l2cap_hdr *lh;
2122 int len, count;
2123
af05b30b
GP		 2124 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
2125 conn, code, ident, dlen);
1da177e4
LT		 2126
2127 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2128 count = min_t(unsigned int, conn->mtu, len);
2129
2130 skb = bt_skb_alloc(count, GFP_ATOMIC);
2131 if (!skb)
2132 return NULL;
2133
2134 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
aca3192c 2135 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
8db4dc46 2136 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1da177e4
LT		 2137
2138 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2139 cmd->code = code;
2140 cmd->ident = ident;
aca3192c 2141 cmd->len = cpu_to_le16(dlen);
1da177e4
LT		 2142
2143 if (dlen) {
2144 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2145 memcpy(skb_put(skb, count), data, count);
2146 data += count;
2147 }
2148
2149 len -= skb->len;
2150
2151 /* Continuation fragments (no L2CAP header) */
2152 frag = &skb_shinfo(skb)->frag_list;
2153 while (len) {
2154 count = min_t(unsigned int, conn->mtu, len);
2155
2156 *frag = bt_skb_alloc(count, GFP_ATOMIC);
2157 if (!*frag)
2158 goto fail;
2159
2160 memcpy(skb_put(*frag, count), data, count);
2161
2162 len -= count;
2163 data += count;
2164
2165 frag = &(*frag)->next;
2166 }
2167
2168 return skb;
2169
2170fail:
2171 kfree_skb(skb);
2172 return NULL;
2173}
2174
2175static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
2176{
2177 struct l2cap_conf_opt *opt = *ptr;
2178 int len;
2179
2180 len = L2CAP_CONF_OPT_SIZE + opt->len;
2181 *ptr += len;
2182
2183 *type = opt->type;
2184 *olen = opt->len;
2185
2186 switch (opt->len) {
2187 case 1:
2188 *val = *((u8 *) opt->val);
2189 break;
2190
2191 case 2:
861d6882 2192 *val = __le16_to_cpu(*((__le16 *) opt->val));
1da177e4
LT		 2193 break;
2194
2195 case 4:
861d6882 2196 *val = __le32_to_cpu(*((__le32 *) opt->val));
1da177e4
LT		 2197 break;
2198
2199 default:
2200 *val = (unsigned long) opt->val;
2201 break;
2202 }
2203
2204 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
2205 return len;
2206}
2207
1da177e4
LT		 2208static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2209{
2210 struct l2cap_conf_opt *opt = *ptr;
2211
2212 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
2213
2214 opt->type = type;
2215 opt->len = len;
2216
2217 switch (len) {
2218 case 1:
2219 *((u8 *) opt->val) = val;
2220 break;
2221
2222 case 2:
8e036fc3 2223 *((__le16 *) opt->val) = cpu_to_le16(val);
1da177e4
LT		 2224 break;
2225
2226 case 4:
8e036fc3 2227 *((__le32 *) opt->val) = cpu_to_le32(val);
1da177e4
LT		 2228 break;
2229
2230 default:
2231 memcpy(opt->val, (void *) val, len);
2232 break;
2233 }
2234
2235 *ptr += L2CAP_CONF_OPT_SIZE + len;
2236}
2237
c1b4f43b
GP		 2238static void l2cap_ack_timeout(unsigned long arg)
2239{
2240 struct sock *sk = (void *) arg;
2241
2242 bh_lock_sock(sk);
2243 l2cap_send_ack(l2cap_pi(sk));
2244 bh_unlock_sock(sk);
2245}
2246
0565c1c2
GP		 2247static inline void l2cap_ertm_init(struct sock *sk)
2248{
2249 l2cap_pi(sk)->expected_ack_seq = 0;
2250 l2cap_pi(sk)->unacked_frames = 0;
2251 l2cap_pi(sk)->buffer_seq = 0;
2252 l2cap_pi(sk)->num_to_ack = 0;
d5392c8f 2253 l2cap_pi(sk)->frames_sent = 0;
0565c1c2
GP		 2254
2255 setup_timer(&l2cap_pi(sk)->retrans_timer,
2256 l2cap_retrans_timeout, (unsigned long) sk);
2257 setup_timer(&l2cap_pi(sk)->monitor_timer,
2258 l2cap_monitor_timeout, (unsigned long) sk);
c1b4f43b
GP		 2259 setup_timer(&l2cap_pi(sk)->ack_timer,
2260 l2cap_ack_timeout, (unsigned long) sk);
0565c1c2
GP		 2261
2262 __skb_queue_head_init(SREJ_QUEUE(sk));
2263}
2264
f2fcfcd6
GP		 2265static int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
2266{
2267 u32 local_feat_mask = l2cap_feat_mask;
2268 if (enable_ertm)
6840ed07 2269 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
f2fcfcd6
GP		 2270
2271 switch (mode) {
2272 case L2CAP_MODE_ERTM:
2273 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
2274 case L2CAP_MODE_STREAMING:
2275 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
2276 default:
2277 return 0x00;
2278 }
2279}
2280
2281static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2282{
2283 switch (mode) {
2284 case L2CAP_MODE_STREAMING:
2285 case L2CAP_MODE_ERTM:
2286 if (l2cap_mode_supported(mode, remote_feat_mask))
2287 return mode;
2288 /* fall through */
2289 default:
2290 return L2CAP_MODE_BASIC;
2291 }
2292}
2293
1da177e4
LT		 2294static int l2cap_build_conf_req(struct sock *sk, void *data)
2295{
2296 struct l2cap_pinfo *pi = l2cap_pi(sk);
2297 struct l2cap_conf_req *req = data;
a0e55a32 2298 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
1da177e4
LT		 2299 void *ptr = req->data;
2300
2301 BT_DBG("sk %p", sk);
2302
f2fcfcd6
GP		 2303 if (pi->num_conf_req || pi->num_conf_rsp)
2304 goto done;
2305
2306 switch (pi->mode) {
2307 case L2CAP_MODE_STREAMING:
2308 case L2CAP_MODE_ERTM:
2309 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
22121fc9
GP		 2310 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
2311 l2cap_send_disconn_req(pi->conn, sk);
f2fcfcd6
GP		 2312 break;
2313 default:
2314 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2315 break;
2316 }
2317
2318done:
65c7c491
MH		 2319 switch (pi->mode) {
2320 case L2CAP_MODE_BASIC:
2321 if (pi->imtu != L2CAP_DEFAULT_MTU)
2322 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
2323 break;
2324
2325 case L2CAP_MODE_ERTM:
2326 rfc.mode = L2CAP_MODE_ERTM;
f2fcfcd6 2327 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
5fbcd3d1 2328 rfc.max_transmit = max_transmit;
f2fcfcd6
GP		 2329 rfc.retrans_timeout = 0;
2330 rfc.monitor_timeout = 0;
c74e560c 2331 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091
GP		 2332 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
2333 rfc.max_pdu_size = pi->conn->mtu - 10;
f2fcfcd6
GP		 2334
2335 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2336 sizeof(rfc), (unsigned long) &rfc);
fcc203c3
GP		 2337
2338 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2339 break;
2340
2341 if (pi->fcs == L2CAP_FCS_NONE ||
2342 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2343 pi->fcs = L2CAP_FCS_NONE;
2344 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2345 }
f2fcfcd6
GP		 2346 break;
2347
2348 case L2CAP_MODE_STREAMING:
2349 rfc.mode = L2CAP_MODE_STREAMING;
2350 rfc.txwin_size = 0;
2351 rfc.max_transmit = 0;
2352 rfc.retrans_timeout = 0;
2353 rfc.monitor_timeout = 0;
c74e560c 2354 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091
GP		 2355 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
2356 rfc.max_pdu_size = pi->conn->mtu - 10;
65c7c491
MH		 2357
2358 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2359 sizeof(rfc), (unsigned long) &rfc);
fcc203c3
GP		 2360
2361 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2362 break;
2363
2364 if (pi->fcs == L2CAP_FCS_NONE ||
2365 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2366 pi->fcs = L2CAP_FCS_NONE;
2367 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2368 }
65c7c491
MH		 2369 break;
2370 }
1da177e4
LT		 2371
2372 /* FIXME: Need actual value of the flush timeout */
2373 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2374 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2375
aca3192c
YH		 2376 req->dcid = cpu_to_le16(pi->dcid);
2377 req->flags = cpu_to_le16(0);
1da177e4
LT		 2378
2379 return ptr - data;
2380}
2381
5dee9e7c 2382static int l2cap_parse_conf_req(struct sock *sk, void *data)
1da177e4
LT		 2383{
2384 struct l2cap_pinfo *pi = l2cap_pi(sk);
5dee9e7c
MH		 2385 struct l2cap_conf_rsp *rsp = data;
2386 void *ptr = rsp->data;
2387 void *req = pi->conf_req;
2388 int len = pi->conf_len;
2389 int type, hint, olen;
2390 unsigned long val;
6464f35f 2391 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 2392 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2393 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2394
5dee9e7c 2395 BT_DBG("sk %p", sk);
820ae1b8 2396
5dee9e7c
MH		 2397 while (len >= L2CAP_CONF_OPT_SIZE) {
2398 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2399
589d2746 2400 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2401 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2402
2403 switch (type) {
2404 case L2CAP_CONF_MTU:
861d6882 2405 mtu = val;
5dee9e7c
MH		 2406 break;
2407
2408 case L2CAP_CONF_FLUSH_TO:
2409 pi->flush_to = val;
2410 break;
2411
2412 case L2CAP_CONF_QOS:
2413 break;
2414
6464f35f
MH		 2415 case L2CAP_CONF_RFC:
2416 if (olen == sizeof(rfc))
2417 memcpy(&rfc, (void *) val, olen);
2418 break;
2419
fcc203c3
GP		 2420 case L2CAP_CONF_FCS:
2421 if (val == L2CAP_FCS_NONE)
2422 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2423
2424 break;
2425
5dee9e7c
MH		 2426 default:
2427 if (hint)
2428 break;
2429
2430 result = L2CAP_CONF_UNKNOWN;
2431 *((u8 *) ptr++) = type;
2432 break;
2433 }
2434 }
2435
f2fcfcd6
GP		 2436 if (pi->num_conf_rsp || pi->num_conf_req)
2437 goto done;
2438
2439 switch (pi->mode) {
2440 case L2CAP_MODE_STREAMING:
2441 case L2CAP_MODE_ERTM:
2442 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
2443 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
2444 return -ECONNREFUSED;
2445 break;
2446 default:
2447 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2448 break;
2449 }
2450
2451done:
2452 if (pi->mode != rfc.mode) {
2453 result = L2CAP_CONF_UNACCEPT;
2454 rfc.mode = pi->mode;
2455
2456 if (pi->num_conf_rsp == 1)
2457 return -ECONNREFUSED;
2458
2459 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2460 sizeof(rfc), (unsigned long) &rfc);
2461 }
2462
2463
5dee9e7c
MH		 2464 if (result == L2CAP_CONF_SUCCESS) {
2465 /* Configure output options and let the other side know
2466 * which ones we don't like. */
2467
f2fcfcd6
GP		 2468 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2469 result = L2CAP_CONF_UNACCEPT;
2470 else {
2471 pi->omtu = mtu;
2472 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2473 }
2474 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
6464f35f 2475
f2fcfcd6
GP		 2476 switch (rfc.mode) {
2477 case L2CAP_MODE_BASIC:
2478 pi->fcs = L2CAP_FCS_NONE;
2479 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2480 break;
2481
2482 case L2CAP_MODE_ERTM:
2483 pi->remote_tx_win = rfc.txwin_size;
2484 pi->remote_max_tx = rfc.max_transmit;
2485 pi->max_pdu_size = rfc.max_pdu_size;
2486
2487 rfc.retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
2488 rfc.monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
2489
2490 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2491
2492 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2493 sizeof(rfc), (unsigned long) &rfc);
2494
f2fcfcd6
GP		 2495 break;
2496
2497 case L2CAP_MODE_STREAMING:
f2fcfcd6
GP		 2498 pi->max_pdu_size = rfc.max_pdu_size;
2499
2500 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2501
2502 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2503 sizeof(rfc), (unsigned long) &rfc);
2504
f2fcfcd6
GP		 2505 break;
2506
2507 default:
5dee9e7c 2508 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2509
6464f35f 2510 memset(&rfc, 0, sizeof(rfc));
f2fcfcd6
GP		 2511 rfc.mode = pi->mode;
2512 }
6464f35f 2513
f2fcfcd6
GP		 2514 if (result == L2CAP_CONF_SUCCESS)
2515 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2516 }
5dee9e7c
MH		 2517 rsp->scid = cpu_to_le16(pi->dcid);
2518 rsp->result = cpu_to_le16(result);
2519 rsp->flags = cpu_to_le16(0x0000);
2520
2521 return ptr - data;
1da177e4
LT		 2522}
2523
f2fcfcd6
GP		 2524static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2525{
2526 struct l2cap_pinfo *pi = l2cap_pi(sk);
2527 struct l2cap_conf_req *req = data;
2528 void *ptr = req->data;
2529 int type, olen;
2530 unsigned long val;
2531 struct l2cap_conf_rfc rfc;
2532
2533 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2534
2535 while (len >= L2CAP_CONF_OPT_SIZE) {
2536 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2537
2538 switch (type) {
2539 case L2CAP_CONF_MTU:
2540 if (val < L2CAP_DEFAULT_MIN_MTU) {
2541 *result = L2CAP_CONF_UNACCEPT;
2542 pi->omtu = L2CAP_DEFAULT_MIN_MTU;
2543 } else
2544 pi->omtu = val;
2545 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2546 break;
2547
2548 case L2CAP_CONF_FLUSH_TO:
2549 pi->flush_to = val;
2550 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2551 2, pi->flush_to);
2552 break;
2553
2554 case L2CAP_CONF_RFC:
2555 if (olen == sizeof(rfc))
2556 memcpy(&rfc, (void *)val, olen);
2557
2558 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2559 rfc.mode != pi->mode)
2560 return -ECONNREFUSED;
2561
2562 pi->mode = rfc.mode;
2563 pi->fcs = 0;
2564
2565 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2566 sizeof(rfc), (unsigned long) &rfc);
2567 break;
2568 }
2569 }
2570
2571 if (*result == L2CAP_CONF_SUCCESS) {
2572 switch (rfc.mode) {
2573 case L2CAP_MODE_ERTM:
2574 pi->remote_tx_win = rfc.txwin_size;
2575 pi->retrans_timeout = rfc.retrans_timeout;
2576 pi->monitor_timeout = rfc.monitor_timeout;
2577 pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
2578 break;
2579 case L2CAP_MODE_STREAMING:
2580 pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
2581 break;
2582 }
2583 }
2584
2585 req->dcid = cpu_to_le16(pi->dcid);
2586 req->flags = cpu_to_le16(0x0000);
2587
2588 return ptr - data;
2589}
2590
5dee9e7c 2591static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1da177e4
LT		 2592{
2593 struct l2cap_conf_rsp *rsp = data;
2594 void *ptr = rsp->data;
1da177e4 2595
5dee9e7c 2596 BT_DBG("sk %p", sk);
1da177e4 2597
aca3192c 2598 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
5dee9e7c 2599 rsp->result = cpu_to_le16(result);
aca3192c 2600 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2601
2602 return ptr - data;
2603}
2604
4e8402a3
MH		 2605static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2606{
2607 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2608
2609 if (rej->reason != 0x0000)
2610 return 0;
2611
2612 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2613 cmd->ident == conn->info_ident) {
4e8402a3 2614 del_timer(&conn->info_timer);
984947dc
MH		 2615
2616 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2617 conn->info_ident = 0;
984947dc 2618
4e8402a3
MH		 2619 l2cap_conn_start(conn);
2620 }
2621
2622 return 0;
2623}
2624
1da177e4
LT		 2625static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2626{
2627 struct l2cap_chan_list *list = &conn->chan_list;
2628 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2629 struct l2cap_conn_rsp rsp;
2630 struct sock *sk, *parent;
e7c29cb1 2631 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2632
2633 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2634 __le16 psm = req->psm;
1da177e4
LT		 2635
2636 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2637
2638 /* Check if we have socket listening on psm */
2639 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2640 if (!parent) {
2641 result = L2CAP_CR_BAD_PSM;
2642 goto sendresp;
2643 }
2644
e7c29cb1
MH		 2645 /* Check if the ACL is secure enough (if not SDP) */
2646 if (psm != cpu_to_le16(0x0001) &&
2647 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2648 conn->disc_reason = 0x05;
e7c29cb1
MH		 2649 result = L2CAP_CR_SEC_BLOCK;
2650 goto response;
2651 }
2652
1da177e4
LT		 2653 result = L2CAP_CR_NO_MEM;
2654
2655 /* Check for backlog size */
2656 if (sk_acceptq_is_full(parent)) {
8e87d142 2657 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2658 goto response;
2659 }
2660
3b1e0a65 2661 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1da177e4
LT		 2662 if (!sk)
2663 goto response;
2664
fd1278d7 2665 write_lock_bh(&list->lock);
1da177e4
LT		 2666
2667 /* Check if we already have channel with that dcid */
2668 if (__l2cap_get_chan_by_dcid(list, scid)) {
fd1278d7 2669 write_unlock_bh(&list->lock);
1da177e4
LT		 2670 sock_set_flag(sk, SOCK_ZAPPED);
2671 l2cap_sock_kill(sk);
2672 goto response;
2673 }
2674
2675 hci_conn_hold(conn->hcon);
2676
2677 l2cap_sock_init(sk, parent);
2678 bacpy(&bt_sk(sk)->src, conn->src);
2679 bacpy(&bt_sk(sk)->dst, conn->dst);
2680 l2cap_pi(sk)->psm = psm;
2681 l2cap_pi(sk)->dcid = scid;
2682
2683 __l2cap_chan_add(conn, sk, parent);
2684 dcid = l2cap_pi(sk)->scid;
2685
2686 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2687
1da177e4
LT		 2688 l2cap_pi(sk)->ident = cmd->ident;
2689
984947dc 2690 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2af6b9d5 2691 if (l2cap_check_security(sk)) {
f66dc81f
MH		 2692 if (bt_sk(sk)->defer_setup) {
2693 sk->sk_state = BT_CONNECT2;
2694 result = L2CAP_CR_PEND;
2695 status = L2CAP_CS_AUTHOR_PEND;
2696 parent->sk_data_ready(parent, 0);
2697 } else {
2698 sk->sk_state = BT_CONFIG;
2699 result = L2CAP_CR_SUCCESS;
2700 status = L2CAP_CS_NO_INFO;
2701 }
79d554a6
MH		 2702 } else {
2703 sk->sk_state = BT_CONNECT2;
2704 result = L2CAP_CR_PEND;
2705 status = L2CAP_CS_AUTHEN_PEND;
2706 }
2707 } else {
2708 sk->sk_state = BT_CONNECT2;
2709 result = L2CAP_CR_PEND;
2710 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2711 }
2712
fd1278d7 2713 write_unlock_bh(&list->lock);
1da177e4
LT		 2714
2715response:
2716 bh_unlock_sock(parent);
2717
2718sendresp:
aca3192c
YH		 2719 rsp.scid = cpu_to_le16(scid);
2720 rsp.dcid = cpu_to_le16(dcid);
2721 rsp.result = cpu_to_le16(result);
2722 rsp.status = cpu_to_le16(status);
1da177e4 2723 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2724
2725 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2726 struct l2cap_info_req info;
2727 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2728
2729 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2730 conn->info_ident = l2cap_get_ident(conn);
2731
2732 mod_timer(&conn->info_timer, jiffies +
2733 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2734
2735 l2cap_send_cmd(conn, conn->info_ident,
2736 L2CAP_INFO_REQ, sizeof(info), &info);
2737 }
2738
1da177e4
LT		 2739 return 0;
2740}
2741
2742static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2743{
2744 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2745 u16 scid, dcid, result, status;
2746 struct sock *sk;
2747 u8 req[128];
2748
2749 scid = __le16_to_cpu(rsp->scid);
2750 dcid = __le16_to_cpu(rsp->dcid);
2751 result = __le16_to_cpu(rsp->result);
2752 status = __le16_to_cpu(rsp->status);
2753
2754 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2755
2756 if (scid) {
af05b30b
GP		 2757 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2758 if (!sk)
1da177e4
LT		 2759 return 0;
2760 } else {
af05b30b
GP		 2761 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
2762 if (!sk)
1da177e4
LT		 2763 return 0;
2764 }
2765
2766 switch (result) {
2767 case L2CAP_CR_SUCCESS:
2768 sk->sk_state = BT_CONFIG;
2769 l2cap_pi(sk)->ident = 0;
2770 l2cap_pi(sk)->dcid = dcid;
2771 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
2772
6a8d3010
MH		 2773 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
2774
1da177e4
LT		 2775 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2776 l2cap_build_conf_req(sk, req), req);
f2fcfcd6 2777 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 2778 break;
2779
2780 case L2CAP_CR_PEND:
6a8d3010 2781 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 2782 break;
2783
2784 default:
2785 l2cap_chan_del(sk, ECONNREFUSED);
2786 break;
2787 }
2788
2789 bh_unlock_sock(sk);
2790 return 0;
2791}
2792
88219a0f 2793static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 2794{
2795 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2796 u16 dcid, flags;
2797 u8 rsp[64];
2798 struct sock *sk;
5dee9e7c 2799 int len;
1da177e4
LT		 2800
2801 dcid = __le16_to_cpu(req->dcid);
2802 flags = __le16_to_cpu(req->flags);
2803
2804 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2805
af05b30b
GP		 2806 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
2807 if (!sk)
1da177e4
LT		 2808 return -ENOENT;
2809
354f60a9
MH		 2810 if (sk->sk_state == BT_DISCONN)
2811 goto unlock;
2812
5dee9e7c 2813 /* Reject if config buffer is too small. */
88219a0f 2814 len = cmd_len - sizeof(*req);
5dee9e7c
MH		 2815 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
2816 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2817 l2cap_build_conf_rsp(sk, rsp,
2818 L2CAP_CONF_REJECT, flags), rsp);
2819 goto unlock;
2820 }
2821
2822 /* Store config. */
2823 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
2824 l2cap_pi(sk)->conf_len += len;
1da177e4
LT		 2825
2826 if (flags & 0x0001) {
2827 /* Incomplete config. Send empty response. */
2828 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
5dee9e7c
MH		 2829 l2cap_build_conf_rsp(sk, rsp,
2830 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 2831 goto unlock;
2832 }
2833
2834 /* Complete config. */
5dee9e7c 2835 len = l2cap_parse_conf_req(sk, rsp);
f2fcfcd6 2836 if (len < 0) {
22121fc9 2837 l2cap_send_disconn_req(conn, sk);
1da177e4 2838 goto unlock;
f2fcfcd6 2839 }
1da177e4 2840
5dee9e7c 2841 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
f2fcfcd6 2842 l2cap_pi(sk)->num_conf_rsp++;
5dee9e7c 2843
5dee9e7c
MH		 2844 /* Reset config buffer. */
2845 l2cap_pi(sk)->conf_len = 0;
2846
876d9484
MH		 2847 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
2848 goto unlock;
2849
1da177e4 2850 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
f64f9e71
JP		 2851 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
2852 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 2853 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
2854
1da177e4 2855 sk->sk_state = BT_CONNECTED;
e90bac06 2856
0565c1c2
GP		 2857 l2cap_pi(sk)->next_tx_seq = 0;
2858 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 2859 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 2860 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2861 l2cap_ertm_init(sk);
2862
1da177e4 2863 l2cap_chan_ready(sk);
876d9484
MH		 2864 goto unlock;
2865 }
2866
2867 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 2868 u8 buf[64];
1da177e4 2869 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
79d554a6 2870 l2cap_build_conf_req(sk, buf), buf);
f2fcfcd6 2871 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 2872 }
2873
2874unlock:
2875 bh_unlock_sock(sk);
2876 return 0;
2877}
2878
2879static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2880{
2881 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2882 u16 scid, flags, result;
2883 struct sock *sk;
2884
2885 scid = __le16_to_cpu(rsp->scid);
2886 flags = __le16_to_cpu(rsp->flags);
2887 result = __le16_to_cpu(rsp->result);
2888
af05b30b
GP		 2889 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2890 scid, flags, result);
1da177e4 2891
af05b30b
GP		 2892 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2893 if (!sk)
1da177e4
LT		 2894 return 0;
2895
2896 switch (result) {
2897 case L2CAP_CONF_SUCCESS:
2898 break;
2899
2900 case L2CAP_CONF_UNACCEPT:
f2fcfcd6
GP		 2901 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
2902 int len = cmd->len - sizeof(*rsp);
2903 char req[64];
2904
c2c77ec8
AE		 2905 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
2906 l2cap_send_disconn_req(conn, sk);
2907 goto done;
2908 }
2909
f2fcfcd6
GP		 2910 /* throw out any old stored conf requests */
2911 result = L2CAP_CONF_SUCCESS;
2912 len = l2cap_parse_conf_rsp(sk, rsp->data,
2913 len, req, &result);
2914 if (len < 0) {
22121fc9 2915 l2cap_send_disconn_req(conn, sk);
f2fcfcd6
GP		 2916 goto done;
2917 }
2918
2919 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2920 L2CAP_CONF_REQ, len, req);
2921 l2cap_pi(sk)->num_conf_req++;
2922 if (result != L2CAP_CONF_SUCCESS)
2923 goto done;
2924 break;
1da177e4
LT		 2925 }
2926
8e87d142 2927 default:
1da177e4 2928 sk->sk_state = BT_DISCONN;
b1235d79 2929 sk->sk_err = ECONNRESET;
1da177e4 2930 l2cap_sock_set_timer(sk, HZ * 5);
22121fc9 2931 l2cap_send_disconn_req(conn, sk);
1da177e4
LT		 2932 goto done;
2933 }
2934
2935 if (flags & 0x01)
2936 goto done;
2937
1da177e4
LT		 2938 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
2939
2940 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
f64f9e71
JP		 2941 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
2942 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 2943 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
2944
1da177e4 2945 sk->sk_state = BT_CONNECTED;
0565c1c2 2946 l2cap_pi(sk)->next_tx_seq = 0;
1c2acffb 2947 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 2948 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 2949 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2950 l2cap_ertm_init(sk);
2951
1da177e4
LT		 2952 l2cap_chan_ready(sk);
2953 }
2954
2955done:
2956 bh_unlock_sock(sk);
2957 return 0;
2958}
2959
2960static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2961{
2962 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
2963 struct l2cap_disconn_rsp rsp;
2964 u16 dcid, scid;
2965 struct sock *sk;
2966
2967 scid = __le16_to_cpu(req->scid);
2968 dcid = __le16_to_cpu(req->dcid);
2969
2970 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
2971
af05b30b
GP		 2972 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
2973 if (!sk)
1da177e4
LT		 2974 return 0;
2975
aca3192c
YH		 2976 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
2977 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1da177e4
LT		 2978 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
2979
2980 sk->sk_shutdown = SHUTDOWN_MASK;
2981
1c2acffb 2982 skb_queue_purge(TX_QUEUE(sk));
0565c1c2
GP		 2983
2984 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
2985 skb_queue_purge(SREJ_QUEUE(sk));
2986 del_timer(&l2cap_pi(sk)->retrans_timer);
2987 del_timer(&l2cap_pi(sk)->monitor_timer);
c1b4f43b 2988 del_timer(&l2cap_pi(sk)->ack_timer);
0565c1c2 2989 }
1c2acffb 2990
1da177e4
LT		 2991 l2cap_chan_del(sk, ECONNRESET);
2992 bh_unlock_sock(sk);
2993
2994 l2cap_sock_kill(sk);
2995 return 0;
2996}
2997
2998static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2999{
3000 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
3001 u16 dcid, scid;
3002 struct sock *sk;
3003
3004 scid = __le16_to_cpu(rsp->scid);
3005 dcid = __le16_to_cpu(rsp->dcid);
3006
3007 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
3008
af05b30b
GP		 3009 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
3010 if (!sk)
1da177e4
LT		 3011 return 0;
3012
1c2acffb 3013 skb_queue_purge(TX_QUEUE(sk));
0565c1c2
GP		 3014
3015 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
3016 skb_queue_purge(SREJ_QUEUE(sk));
3017 del_timer(&l2cap_pi(sk)->retrans_timer);
3018 del_timer(&l2cap_pi(sk)->monitor_timer);
c1b4f43b 3019 del_timer(&l2cap_pi(sk)->ack_timer);
0565c1c2 3020 }
1c2acffb 3021
1da177e4
LT		 3022 l2cap_chan_del(sk, 0);
3023 bh_unlock_sock(sk);
3024
3025 l2cap_sock_kill(sk);
3026 return 0;
3027}
3028
3029static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3030{
3031 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3032 u16 type;
3033
3034 type = __le16_to_cpu(req->type);
3035
3036 BT_DBG("type 0x%4.4x", type);
3037
f0709e03
MH		 3038 if (type == L2CAP_IT_FEAT_MASK) {
3039 u8 buf[8];
44dd46de 3040 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3041 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3042 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3043 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
44dd46de 3044 if (enable_ertm)
fcc203c3
GP		 3045 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3046 | L2CAP_FEAT_FCS;
1b7bf4ed 3047 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3048 l2cap_send_cmd(conn, cmd->ident,
3049 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3050 } else if (type == L2CAP_IT_FIXED_CHAN) {
3051 u8 buf[12];
3052 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3053 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3054 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3055 memcpy(buf + 4, l2cap_fixed_chan, 8);
3056 l2cap_send_cmd(conn, cmd->ident,
3057 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3058 } else {
3059 struct l2cap_info_rsp rsp;
3060 rsp.type = cpu_to_le16(type);
3061 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3062 l2cap_send_cmd(conn, cmd->ident,
3063 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3064 }
1da177e4
LT		 3065
3066 return 0;
3067}
3068
3069static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3070{
3071 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3072 u16 type, result;
3073
3074 type = __le16_to_cpu(rsp->type);
3075 result = __le16_to_cpu(rsp->result);
3076
3077 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3078
4e8402a3
MH		 3079 del_timer(&conn->info_timer);
3080
984947dc 3081 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3082 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3083
47ec1dcd 3084 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3085 struct l2cap_info_req req;
3086 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3087
3088 conn->info_ident = l2cap_get_ident(conn);
3089
3090 l2cap_send_cmd(conn, conn->info_ident,
3091 L2CAP_INFO_REQ, sizeof(req), &req);
3092 } else {
3093 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3094 conn->info_ident = 0;
3095
3096 l2cap_conn_start(conn);
3097 }
3098 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3099 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3100 conn->info_ident = 0;
984947dc
MH		 3101
3102 l2cap_conn_start(conn);
3103 }
4e8402a3 3104
1da177e4
LT		 3105 return 0;
3106}
3107
3108static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3109{
3110 u8 *data = skb->data;
3111 int len = skb->len;
3112 struct l2cap_cmd_hdr cmd;
3113 int err = 0;
3114
3115 l2cap_raw_recv(conn, skb);
3116
3117 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3118 u16 cmd_len;
1da177e4
LT		 3119 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3120 data += L2CAP_CMD_HDR_SIZE;
3121 len -= L2CAP_CMD_HDR_SIZE;
3122
88219a0f 3123 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3124
88219a0f 3125 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3126
88219a0f 3127 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3128 BT_DBG("corrupted command");
3129 break;
3130 }
3131
3132 switch (cmd.code) {
3133 case L2CAP_COMMAND_REJ:
4e8402a3 3134 l2cap_command_rej(conn, &cmd, data);
1da177e4
LT		 3135 break;
3136
3137 case L2CAP_CONN_REQ:
3138 err = l2cap_connect_req(conn, &cmd, data);
3139 break;
3140
3141 case L2CAP_CONN_RSP:
3142 err = l2cap_connect_rsp(conn, &cmd, data);
3143 break;
3144
3145 case L2CAP_CONF_REQ:
88219a0f 3146 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1da177e4
LT		 3147 break;
3148
3149 case L2CAP_CONF_RSP:
3150 err = l2cap_config_rsp(conn, &cmd, data);
3151 break;
3152
3153 case L2CAP_DISCONN_REQ:
3154 err = l2cap_disconnect_req(conn, &cmd, data);
3155 break;
3156
3157 case L2CAP_DISCONN_RSP:
3158 err = l2cap_disconnect_rsp(conn, &cmd, data);
3159 break;
3160
3161 case L2CAP_ECHO_REQ:
88219a0f 3162 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1da177e4
LT		 3163 break;
3164
3165 case L2CAP_ECHO_RSP:
3166 break;
3167
3168 case L2CAP_INFO_REQ:
3169 err = l2cap_information_req(conn, &cmd, data);
3170 break;
3171
3172 case L2CAP_INFO_RSP:
3173 err = l2cap_information_rsp(conn, &cmd, data);
3174 break;
3175
3176 default:
3177 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3178 err = -EINVAL;
3179 break;
3180 }
3181
3182 if (err) {
3183 struct l2cap_cmd_rej rej;
3184 BT_DBG("error %d", err);
3185
3186 /* FIXME: Map err to a valid reason */
aca3192c 3187 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3188 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3189 }
3190
88219a0f
AV		 3191 data += cmd_len;
3192 len -= cmd_len;
1da177e4
LT		 3193 }
3194
3195 kfree_skb(skb);
3196}
3197
fcc203c3
GP		 3198static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3199{
3200 u16 our_fcs, rcv_fcs;
3201 int hdr_size = L2CAP_HDR_SIZE + 2;
3202
3203 if (pi->fcs == L2CAP_FCS_CRC16) {
3204 skb_trim(skb, skb->len - 2);
3205 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3206 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3207
3208 if (our_fcs != rcv_fcs)
3209 return -EINVAL;
3210 }
3211 return 0;
3212}
3213
d5392c8f
GP		 3214static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3215{
3216 struct l2cap_pinfo *pi = l2cap_pi(sk);
3217 u16 control = 0;
3218
3219 pi->frames_sent = 0;
3220 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
3221
3222 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3223
3224 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3225 control |= L2CAP_SUPER_RCV_NOT_READY | L2CAP_CTRL_FINAL;
3226 l2cap_send_sframe(pi, control);
3227 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
3228 }
3229
3230 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0)
3231 __mod_retrans_timer();
3232
3233 l2cap_ertm_send(sk);
3234
3235 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3236 pi->frames_sent == 0) {
3237 control |= L2CAP_SUPER_RCV_READY;
d5392c8f
GP		 3238 l2cap_send_sframe(pi, control);
3239 }
3240}
3241
8f17154f
GP		 3242static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
3243{
3244 struct sk_buff *next_skb;
3245
3246 bt_cb(skb)->tx_seq = tx_seq;
3247 bt_cb(skb)->sar = sar;
3248
3249 next_skb = skb_peek(SREJ_QUEUE(sk));
3250 if (!next_skb) {
3251 __skb_queue_tail(SREJ_QUEUE(sk), skb);
3252 return;
3253 }
3254
3255 do {
3256 if (bt_cb(next_skb)->tx_seq > tx_seq) {
3257 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
3258 return;
3259 }
3260
3261 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3262 break;
3263
3264 } while((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
3265
3266 __skb_queue_tail(SREJ_QUEUE(sk), skb);
3267}
3268
c74e560c
GP		 3269static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3270{
3271 struct l2cap_pinfo *pi = l2cap_pi(sk);
3272 struct sk_buff *_skb;
3273 int err = -EINVAL;
3274
3275 switch (control & L2CAP_CTRL_SAR) {
3276 case L2CAP_SDU_UNSEGMENTED:
3277 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3278 kfree_skb(pi->sdu);
3279 break;
3280 }
3281
3282 err = sock_queue_rcv_skb(sk, skb);
3283 if (!err)
3284 return 0;
3285
3286 break;
3287
3288 case L2CAP_SDU_START:
3289 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3290 kfree_skb(pi->sdu);
3291 break;
3292 }
3293
3294 pi->sdu_len = get_unaligned_le16(skb->data);
3295 skb_pull(skb, 2);
3296
3297 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3298 if (!pi->sdu) {
3299 err = -ENOMEM;
3300 break;
3301 }
3302
3303 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3304
3305 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3306 pi->partial_sdu_len = skb->len;
3307 err = 0;
3308 break;
3309
3310 case L2CAP_SDU_CONTINUE:
3311 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3312 break;
3313
3314 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3315
3316 pi->partial_sdu_len += skb->len;
3317 if (pi->partial_sdu_len > pi->sdu_len)
3318 kfree_skb(pi->sdu);
3319 else
3320 err = 0;
3321
3322 break;
3323
3324 case L2CAP_SDU_END:
3325 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3326 break;
3327
3328 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3329
3330 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3331 pi->partial_sdu_len += skb->len;
3332
36f2fd58
GP		 3333 if (pi->partial_sdu_len > pi->imtu)
3334 goto drop;
3335
c74e560c
GP		 3336 if (pi->partial_sdu_len == pi->sdu_len) {
3337 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3338 err = sock_queue_rcv_skb(sk, _skb);
3339 if (err < 0)
3340 kfree_skb(_skb);
3341 }
c74e560c
GP		 3342 err = 0;
3343
36f2fd58
GP		 3344drop:
3345 kfree_skb(pi->sdu);
c74e560c
GP		 3346 break;
3347 }
3348
3349 kfree_skb(skb);
3350 return err;
3351}
3352
8f17154f
GP		 3353static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3354{
3355 struct sk_buff *skb;
3356 u16 control = 0;
3357
3358 while((skb = skb_peek(SREJ_QUEUE(sk)))) {
3359 if (bt_cb(skb)->tx_seq != tx_seq)
3360 break;
3361
3362 skb = skb_dequeue(SREJ_QUEUE(sk));
3363 control |= bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3364 l2cap_sar_reassembly_sdu(sk, skb, control);
3365 l2cap_pi(sk)->buffer_seq_srej =
3366 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
3367 tx_seq++;
3368 }
3369}
3370
3371static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3372{
3373 struct l2cap_pinfo *pi = l2cap_pi(sk);
3374 struct srej_list *l, *tmp;
3375 u16 control;
3376
3377 list_for_each_entry_safe(l,tmp, SREJ_LIST(sk), list) {
3378 if (l->tx_seq == tx_seq) {
3379 list_del(&l->list);
3380 kfree(l);
3381 return;
3382 }
3383 control = L2CAP_SUPER_SELECT_REJECT;
3384 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3385 l2cap_send_sframe(pi, control);
3386 list_del(&l->list);
3387 list_add_tail(&l->list, SREJ_LIST(sk));
3388 }
3389}
3390
3391static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3392{
3393 struct l2cap_pinfo *pi = l2cap_pi(sk);
3394 struct srej_list *new;
3395 u16 control;
3396
3397 while (tx_seq != pi->expected_tx_seq) {
3398 control = L2CAP_SUPER_SELECT_REJECT;
3399 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3400 l2cap_send_sframe(pi, control);
3401
3402 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
3403 new->tx_seq = pi->expected_tx_seq++;
3404 list_add_tail(&new->list, SREJ_LIST(sk));
3405 }
3406 pi->expected_tx_seq++;
3407}
3408
1c2acffb
GP		 3409static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3410{
3411 struct l2cap_pinfo *pi = l2cap_pi(sk);
3412 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3413 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3414 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
1c2acffb
GP		 3415 int err = 0;
3416
3417 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
3418
1d8f5d16
GP		 3419 if (L2CAP_CTRL_FINAL & rx_control) {
3420 del_timer(&pi->monitor_timer);
3421 if (pi->unacked_frames > 0)
3422 __mod_retrans_timer();
3423 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
3424 }
3425
9f121a5a
GP		 3426 pi->expected_ack_seq = req_seq;
3427 l2cap_drop_acked_frames(sk);
3428
8f17154f
GP		 3429 if (tx_seq == pi->expected_tx_seq)
3430 goto expected;
1c2acffb 3431
8f17154f
GP		 3432 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3433 struct srej_list *first;
30afb5b2 3434
8f17154f
GP		 3435 first = list_first_entry(SREJ_LIST(sk),
3436 struct srej_list, list);
3437 if (tx_seq == first->tx_seq) {
3438 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3439 l2cap_check_srej_gap(sk, tx_seq);
3440
3441 list_del(&first->list);
3442 kfree(first);
3443
3444 if (list_empty(SREJ_LIST(sk))) {
3445 pi->buffer_seq = pi->buffer_seq_srej;
3446 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
3447 }
3448 } else {
3449 struct srej_list *l;
3450 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3451
3452 list_for_each_entry(l, SREJ_LIST(sk), list) {
3453 if (l->tx_seq == tx_seq) {
3454 l2cap_resend_srejframe(sk, tx_seq);
3455 return 0;
3456 }
3457 }
3458 l2cap_send_srejframe(sk, tx_seq);
30afb5b2
GP		 3459 }
3460 } else {
8f17154f 3461 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 3462
8f17154f
GP		 3463 INIT_LIST_HEAD(SREJ_LIST(sk));
3464 pi->buffer_seq_srej = pi->buffer_seq;
3465
3466 __skb_queue_head_init(SREJ_QUEUE(sk));
3467 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3468
ef54fd93
GP		 3469 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
3470
8f17154f 3471 l2cap_send_srejframe(sk, tx_seq);
1c2acffb 3472 }
30afb5b2
GP		 3473 return 0;
3474
8f17154f
GP		 3475expected:
3476 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3477
3478 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3479 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3480 return 0;
3481 }
3482
4ec10d97
GP		 3483 if (rx_control & L2CAP_CTRL_FINAL) {
3484 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3485 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3486 else {
3487 sk->sk_send_head = TX_QUEUE(sk)->next;
3488 pi->next_tx_seq = pi->expected_ack_seq;
3489 l2cap_ertm_send(sk);
3490 }
3491 }
3492
8f17154f
GP		 3493 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3494
3495 err = l2cap_sar_reassembly_sdu(sk, skb, rx_control);
3496 if (err < 0)
3497 return err;
3498
c1b4f43b
GP		 3499 __mod_ack_timer();
3500
8f17154f 3501 pi->num_to_ack = (pi->num_to_ack + 1) % L2CAP_DEFAULT_NUM_TO_ACK;
9e917af1
GP		 3502 if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1)
3503 l2cap_send_ack(pi);
3504
8f17154f 3505 return 0;
1c2acffb
GP		 3506}
3507
e072745f 3508static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
1c2acffb
GP		 3509{
3510 struct l2cap_pinfo *pi = l2cap_pi(sk);
6e3a5981
GP		 3511
3512 pi->expected_ack_seq = __get_reqseq(rx_control);
3513 l2cap_drop_acked_frames(sk);
1c2acffb 3514
e072745f 3515 if (rx_control & L2CAP_CTRL_POLL) {
05fbd89d
GP		 3516 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3517 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3518 (pi->unacked_frames > 0))
3519 __mod_retrans_timer();
3520
3521 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3522 l2cap_send_srejtail(sk);
3523 } else {
3524 l2cap_send_i_or_rr_or_rnr(sk);
3525 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3526 }
1d8f5d16 3527
e072745f
GP		 3528 } else if (rx_control & L2CAP_CTRL_FINAL) {
3529 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 3530
e072745f
GP		 3531 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3532 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3533 else {
3534 sk->sk_send_head = TX_QUEUE(sk)->next;
3535 pi->next_tx_seq = pi->expected_ack_seq;
3536 l2cap_ertm_send(sk);
3537 }
2246b2f1 3538
e072745f 3539 } else {
e072745f
GP		 3540 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3541 (pi->unacked_frames > 0))
3542 __mod_retrans_timer();
1c2acffb 3543
2246b2f1 3544 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
e072745f
GP		 3545 if (pi->conn_state & L2CAP_CONN_SREJ_SENT)
3546 l2cap_send_ack(pi);
3547 else
3548 l2cap_ertm_send(sk);
3549 }
3550}
2246b2f1 3551
e072745f
GP		 3552static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
3553{
3554 struct l2cap_pinfo *pi = l2cap_pi(sk);
3555 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 3556
e072745f
GP		 3557 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3558
8abb52ee 3559 pi->expected_ack_seq = tx_seq;
e072745f
GP		 3560 l2cap_drop_acked_frames(sk);
3561
3562 if (rx_control & L2CAP_CTRL_FINAL) {
3563 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3564 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3565 else {
4ec10d97
GP		 3566 sk->sk_send_head = TX_QUEUE(sk)->next;
3567 pi->next_tx_seq = pi->expected_ack_seq;
3568 l2cap_ertm_send(sk);
4ec10d97 3569 }
e072745f
GP		 3570 } else {
3571 sk->sk_send_head = TX_QUEUE(sk)->next;
3572 pi->next_tx_seq = pi->expected_ack_seq;
3573 l2cap_ertm_send(sk);
30afb5b2 3574
e072745f
GP		 3575 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3576 pi->srej_save_reqseq = tx_seq;
3577 pi->conn_state |= L2CAP_CONN_REJ_ACT;
3578 }
3579 }
3580}
3581static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
3582{
3583 struct l2cap_pinfo *pi = l2cap_pi(sk);
3584 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 3585
e072745f 3586 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 3587
e072745f
GP		 3588 if (rx_control & L2CAP_CTRL_POLL) {
3589 pi->expected_ack_seq = tx_seq;
3590 l2cap_drop_acked_frames(sk);
3591 l2cap_retransmit_frame(sk, tx_seq);
3592 l2cap_ertm_send(sk);
3593 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3594 pi->srej_save_reqseq = tx_seq;
3595 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 3596 }
e072745f
GP		 3597 } else if (rx_control & L2CAP_CTRL_FINAL) {
3598 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
3599 pi->srej_save_reqseq == tx_seq)
3600 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
3601 else
ef54fd93 3602 l2cap_retransmit_frame(sk, tx_seq);
e072745f
GP		 3603 } else {
3604 l2cap_retransmit_frame(sk, tx_seq);
3605 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3606 pi->srej_save_reqseq = tx_seq;
3607 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 3608 }
e072745f
GP		 3609 }
3610}
3611
3612static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
3613{
3614 struct l2cap_pinfo *pi = l2cap_pi(sk);
3615 u8 tx_seq = __get_reqseq(rx_control);
3616
3617 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
3618 pi->expected_ack_seq = tx_seq;
3619 l2cap_drop_acked_frames(sk);
3620
99b0d4b7
GP		 3621 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
3622 del_timer(&pi->retrans_timer);
3623 if (rx_control & L2CAP_CTRL_POLL) {
3624 u16 control = L2CAP_CTRL_FINAL;
3625 l2cap_send_rr_or_rnr(pi, control);
3626 }
3627 return;
e072745f 3628 }
99b0d4b7
GP		 3629
3630 if (rx_control & L2CAP_CTRL_POLL)
3631 l2cap_send_srejtail(sk);
3632 else
3633 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
e072745f
GP		 3634}
3635
3636static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3637{
3638 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
3639
3640 if (L2CAP_CTRL_FINAL & rx_control) {
3641 del_timer(&l2cap_pi(sk)->monitor_timer);
3642 if (l2cap_pi(sk)->unacked_frames > 0)
3643 __mod_retrans_timer();
3644 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
3645 }
3646
3647 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
3648 case L2CAP_SUPER_RCV_READY:
3649 l2cap_data_channel_rrframe(sk, rx_control);
8f17154f
GP		 3650 break;
3651
e072745f
GP		 3652 case L2CAP_SUPER_REJECT:
3653 l2cap_data_channel_rejframe(sk, rx_control);
3654 break;
2246b2f1 3655
e072745f
GP		 3656 case L2CAP_SUPER_SELECT_REJECT:
3657 l2cap_data_channel_srejframe(sk, rx_control);
3658 break;
3659
3660 case L2CAP_SUPER_RCV_NOT_READY:
3661 l2cap_data_channel_rnrframe(sk, rx_control);
1c2acffb
GP		 3662 break;
3663 }
3664
faaebd19 3665 kfree_skb(skb);
1c2acffb
GP		 3666 return 0;
3667}
3668
1da177e4
LT		 3669static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
3670{
3671 struct sock *sk;
6840ed07 3672 struct l2cap_pinfo *pi;
c74e560c 3673 u16 control, len;
6840ed07 3674 u8 tx_seq;
1da177e4
LT		 3675
3676 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
3677 if (!sk) {
3678 BT_DBG("unknown cid 0x%4.4x", cid);
3679 goto drop;
3680 }
3681
6840ed07
GP		 3682 pi = l2cap_pi(sk);
3683
1da177e4
LT		 3684 BT_DBG("sk %p, len %d", sk, skb->len);
3685
3686 if (sk->sk_state != BT_CONNECTED)
3687 goto drop;
3688
6840ed07 3689 switch (pi->mode) {
1c2acffb
GP		 3690 case L2CAP_MODE_BASIC:
3691 /* If socket recv buffers overflows we drop data here
3692 * which is *bad* because L2CAP has to be reliable.
3693 * But we don't have any other choice. L2CAP doesn't
3694 * provide flow control mechanism. */
1da177e4 3695
6840ed07 3696 if (pi->imtu < skb->len)
1c2acffb 3697 goto drop;
1da177e4 3698
1c2acffb
GP		 3699 if (!sock_queue_rcv_skb(sk, skb))
3700 goto done;
3701 break;
3702
3703 case L2CAP_MODE_ERTM:
3704 control = get_unaligned_le16(skb->data);
3705 skb_pull(skb, 2);
c74e560c 3706 len = skb->len;
1c2acffb 3707
c74e560c
GP		 3708 if (__is_sar_start(control))
3709 len -= 2;
3710
fcc203c3
GP		 3711 if (pi->fcs == L2CAP_FCS_CRC16)
3712 len -= 2;
3713
30afb5b2
GP		 3714 /*
3715 * We can just drop the corrupted I-frame here.
3716 * Receiver will miss it and start proper recovery
3717 * procedures and ask retransmission.
3718 */
c74e560c 3719 if (len > L2CAP_DEFAULT_MAX_PDU_SIZE)
1c2acffb
GP		 3720 goto drop;
3721
fcc203c3
GP		 3722 if (l2cap_check_fcs(pi, skb))
3723 goto drop;
3724
277ffbe3
GP		 3725 if (__is_iframe(control)) {
3726 if (len < 4)
3727 goto drop;
3728
fcafde2e 3729 l2cap_data_channel_iframe(sk, control, skb);
277ffbe3
GP		 3730 } else {
3731 if (len != 0)
3732 goto drop;
3733
fcafde2e 3734 l2cap_data_channel_sframe(sk, control, skb);
277ffbe3 3735 }
1c2acffb 3736
fcafde2e 3737 goto done;
1c2acffb 3738
6840ed07
GP		 3739 case L2CAP_MODE_STREAMING:
3740 control = get_unaligned_le16(skb->data);
3741 skb_pull(skb, 2);
3742 len = skb->len;
3743
3744 if (__is_sar_start(control))
3745 len -= 2;
3746
fcc203c3
GP		 3747 if (pi->fcs == L2CAP_FCS_CRC16)
3748 len -= 2;
3749
277ffbe3
GP		 3750 if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || len < 4
3751 || __is_sframe(control))
6840ed07
GP		 3752 goto drop;
3753
fcc203c3
GP		 3754 if (l2cap_check_fcs(pi, skb))
3755 goto drop;
3756
6840ed07
GP		 3757 tx_seq = __get_txseq(control);
3758
3759 if (pi->expected_tx_seq == tx_seq)
3760 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3761 else
7dffe421 3762 pi->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 3763
fcafde2e 3764 l2cap_sar_reassembly_sdu(sk, skb, control);
6840ed07
GP		 3765
3766 goto done;
3767
1c2acffb 3768 default:
e8235c6b 3769 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
1c2acffb
GP		 3770 break;
3771 }
1da177e4
LT		 3772
3773drop:
3774 kfree_skb(skb);
3775
3776done:
0139418c
MH		 3777 if (sk)
3778 bh_unlock_sock(sk);
3779
1da177e4
LT		 3780 return 0;
3781}
3782
8e036fc3 3783static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4
LT		 3784{
3785 struct sock *sk;
3786
3787 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
3788 if (!sk)
3789 goto drop;
3790
3791 BT_DBG("sk %p, len %d", sk, skb->len);
3792
3793 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
3794 goto drop;
3795
3796 if (l2cap_pi(sk)->imtu < skb->len)
3797 goto drop;
3798
3799 if (!sock_queue_rcv_skb(sk, skb))
3800 goto done;
3801
3802drop:
3803 kfree_skb(skb);
3804
3805done:
af05b30b
GP		 3806 if (sk)
3807 bh_unlock_sock(sk);
1da177e4
LT		 3808 return 0;
3809}
3810
3811static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
3812{
3813 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 3814 u16 cid, len;
3815 __le16 psm;
1da177e4
LT		 3816
3817 skb_pull(skb, L2CAP_HDR_SIZE);
3818 cid = __le16_to_cpu(lh->cid);
3819 len = __le16_to_cpu(lh->len);
3820
1c2acffb
GP		 3821 if (len != skb->len) {
3822 kfree_skb(skb);
3823 return;
3824 }
3825
1da177e4
LT		 3826 BT_DBG("len %d, cid 0x%4.4x", len, cid);
3827
3828 switch (cid) {
8db4dc46 3829 case L2CAP_CID_SIGNALING:
1da177e4
LT		 3830 l2cap_sig_channel(conn, skb);
3831 break;
3832
8db4dc46 3833 case L2CAP_CID_CONN_LESS:
1b7bf4ed 3834 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 3835 skb_pull(skb, 2);
3836 l2cap_conless_channel(conn, psm, skb);
3837 break;
3838
3839 default:
3840 l2cap_data_channel(conn, cid, skb);
3841 break;
3842 }
3843}
3844
3845/* ---- L2CAP interface with lower layer (HCI) ---- */
3846
3847static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
3848{
3849 int exact = 0, lm1 = 0, lm2 = 0;
3850 register struct sock *sk;
3851 struct hlist_node *node;
3852
3853 if (type != ACL_LINK)
3854 return 0;
3855
3856 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
3857
3858 /* Find listening sockets and check their link_mode */
3859 read_lock(&l2cap_sk_list.lock);
3860 sk_for_each(sk, node, &l2cap_sk_list.head) {
3861 if (sk->sk_state != BT_LISTEN)
3862 continue;
3863
3864 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5
MH		 3865 lm1 |= HCI_LM_ACCEPT;
3866 if (l2cap_pi(sk)->role_switch)
3867 lm1 |= HCI_LM_MASTER;
1da177e4 3868 exact++;
2af6b9d5
MH		 3869 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
3870 lm2 |= HCI_LM_ACCEPT;
3871 if (l2cap_pi(sk)->role_switch)
3872 lm2 |= HCI_LM_MASTER;
3873 }
1da177e4
LT		 3874 }
3875 read_unlock(&l2cap_sk_list.lock);
3876
3877 return exact ? lm1 : lm2;
3878}
3879
3880static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
3881{
0139418c
MH		 3882 struct l2cap_conn *conn;
3883
1da177e4
LT		 3884 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
3885
3886 if (hcon->type != ACL_LINK)
3887 return 0;
3888
3889 if (!status) {
1da177e4
LT		 3890 conn = l2cap_conn_add(hcon, status);
3891 if (conn)
3892 l2cap_conn_ready(conn);
0139418c 3893 } else
1da177e4
LT		 3894 l2cap_conn_del(hcon, bt_err(status));
3895
3896 return 0;
3897}
3898
2950f21a
MH		 3899static int l2cap_disconn_ind(struct hci_conn *hcon)
3900{
3901 struct l2cap_conn *conn = hcon->l2cap_data;
3902
3903 BT_DBG("hcon %p", hcon);
3904
3905 if (hcon->type != ACL_LINK || !conn)
3906 return 0x13;
3907
3908 return conn->disc_reason;
3909}
3910
3911static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 3912{
3913 BT_DBG("hcon %p reason %d", hcon, reason);
3914
3915 if (hcon->type != ACL_LINK)
3916 return 0;
3917
3918 l2cap_conn_del(hcon, bt_err(reason));
0139418c 3919
1da177e4
LT		 3920 return 0;
3921}
3922
f62e4323
MH		 3923static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
3924{
255c7601
MH		 3925 if (sk->sk_type != SOCK_SEQPACKET)
3926 return;
3927
f62e4323
MH		 3928 if (encrypt == 0x00) {
3929 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
3930 l2cap_sock_clear_timer(sk);
3931 l2cap_sock_set_timer(sk, HZ * 5);
3932 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
3933 __l2cap_sock_close(sk, ECONNREFUSED);
3934 } else {
3935 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
3936 l2cap_sock_clear_timer(sk);
3937 }
3938}
3939
8c1b2355 3940static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4
LT		 3941{
3942 struct l2cap_chan_list *l;
0139418c 3943 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 3944 struct sock *sk;
1da177e4 3945
0139418c 3946 if (!conn)
1da177e4 3947 return 0;
0139418c 3948
1da177e4
LT		 3949 l = &conn->chan_list;
3950
3951 BT_DBG("conn %p", conn);
3952
3953 read_lock(&l->lock);
3954
3955 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
3956 bh_lock_sock(sk);
3957
6a8d3010
MH		 3958 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
3959 bh_unlock_sock(sk);
3960 continue;
3961 }
3962
f62e4323 3963 if (!status && (sk->sk_state == BT_CONNECTED ||
8c1b2355 3964 sk->sk_state == BT_CONFIG)) {
f62e4323 3965 l2cap_check_encryption(sk, encrypt);
9719f8af
MH		 3966 bh_unlock_sock(sk);
3967 continue;
3968 }
3969
b1235d79
MH		 3970 if (sk->sk_state == BT_CONNECT) {
3971 if (!status) {
3972 struct l2cap_conn_req req;
3973 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
3974 req.psm = l2cap_pi(sk)->psm;
1da177e4 3975
b1235d79 3976 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
1da177e4 3977
b1235d79
MH		 3978 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
3979 L2CAP_CONN_REQ, sizeof(req), &req);
3980 } else {
3981 l2cap_sock_clear_timer(sk);
3982 l2cap_sock_set_timer(sk, HZ / 10);
3983 }
3984 } else if (sk->sk_state == BT_CONNECT2) {
3985 struct l2cap_conn_rsp rsp;
3986 __u16 result;
1da177e4 3987
b1235d79
MH		 3988 if (!status) {
3989 sk->sk_state = BT_CONFIG;
3990 result = L2CAP_CR_SUCCESS;
3991 } else {
3992 sk->sk_state = BT_DISCONN;
3993 l2cap_sock_set_timer(sk, HZ / 10);
3994 result = L2CAP_CR_SEC_BLOCK;
3995 }
3996
3997 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
3998 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3999 rsp.result = cpu_to_le16(result);
e7c29cb1 4000 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
b1235d79
MH		 4001 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
4002 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
4003 }
1da177e4
LT		 4004
4005 bh_unlock_sock(sk);
4006 }
4007
4008 read_unlock(&l->lock);
b1235d79 4009
1da177e4
LT		 4010 return 0;
4011}
4012
4013static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4014{
4015 struct l2cap_conn *conn = hcon->l2cap_data;
4016
4017 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4018 goto drop;
4019
4020 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4021
4022 if (flags & ACL_START) {
4023 struct l2cap_hdr *hdr;
4024 int len;
4025
4026 if (conn->rx_len) {
4027 BT_ERR("Unexpected start frame (len %d)", skb->len);
4028 kfree_skb(conn->rx_skb);
4029 conn->rx_skb = NULL;
4030 conn->rx_len = 0;
4031 l2cap_conn_unreliable(conn, ECOMM);
4032 }
4033
4034 if (skb->len < 2) {
4035 BT_ERR("Frame is too short (len %d)", skb->len);
4036 l2cap_conn_unreliable(conn, ECOMM);
4037 goto drop;
4038 }
4039
4040 hdr = (struct l2cap_hdr *) skb->data;
4041 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4042
4043 if (len == skb->len) {
4044 /* Complete frame received */
4045 l2cap_recv_frame(conn, skb);
4046 return 0;
4047 }
4048
4049 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4050
4051 if (skb->len > len) {
4052 BT_ERR("Frame is too long (len %d, expected len %d)",
4053 skb->len, len);
4054 l2cap_conn_unreliable(conn, ECOMM);
4055 goto drop;
4056 }
4057
4058 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4059 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4060 if (!conn->rx_skb)
1da177e4
LT		 4061 goto drop;
4062
d626f62b 4063 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4064 skb->len);
1da177e4
LT		 4065 conn->rx_len = len - skb->len;
4066 } else {
4067 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4068
4069 if (!conn->rx_len) {
4070 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4071 l2cap_conn_unreliable(conn, ECOMM);
4072 goto drop;
4073 }
4074
4075 if (skb->len > conn->rx_len) {
4076 BT_ERR("Fragment is too long (len %d, expected %d)",
4077 skb->len, conn->rx_len);
4078 kfree_skb(conn->rx_skb);
4079 conn->rx_skb = NULL;
4080 conn->rx_len = 0;
4081 l2cap_conn_unreliable(conn, ECOMM);
4082 goto drop;
4083 }
4084
d626f62b 4085 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4086 skb->len);
1da177e4
LT		 4087 conn->rx_len -= skb->len;
4088
4089 if (!conn->rx_len) {
4090 /* Complete frame received */
4091 l2cap_recv_frame(conn, conn->rx_skb);
4092 conn->rx_skb = NULL;
4093 }
4094 }
4095
4096drop:
4097 kfree_skb(skb);
4098 return 0;
4099}
4100
aef7d97c 4101static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4
LT		 4102{
4103 struct sock *sk;
4104 struct hlist_node *node;
1da177e4
LT		 4105
4106 read_lock_bh(&l2cap_sk_list.lock);
4107
be9d1227
MH		 4108 sk_for_each(sk, node, &l2cap_sk_list.head) {
4109 struct l2cap_pinfo *pi = l2cap_pi(sk);
101545f6 4110
aef7d97c
MH		 4111 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4112 batostr(&bt_sk(sk)->src),
4113 batostr(&bt_sk(sk)->dst),
4114 sk->sk_state, __le16_to_cpu(pi->psm),
4115 pi->scid, pi->dcid,
4116 pi->imtu, pi->omtu, pi->sec_level);
be9d1227 4117 }
1da177e4 4118
1da177e4 4119 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 4120
aef7d97c 4121 return 0;
1da177e4
LT		 4122}
4123
aef7d97c
MH		 4124static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4125{
4126 return single_open(file, l2cap_debugfs_show, inode->i_private);
4127}
4128
4129static const struct file_operations l2cap_debugfs_fops = {
4130 .open = l2cap_debugfs_open,
4131 .read = seq_read,
4132 .llseek = seq_lseek,
4133 .release = single_release,
4134};
4135
4136static struct dentry *l2cap_debugfs;
1da177e4 4137
90ddc4f0 4138static const struct proto_ops l2cap_sock_ops = {
1da177e4
LT		 4139 .family = PF_BLUETOOTH,
4140 .owner = THIS_MODULE,
4141 .release = l2cap_sock_release,
4142 .bind = l2cap_sock_bind,
4143 .connect = l2cap_sock_connect,
4144 .listen = l2cap_sock_listen,
4145 .accept = l2cap_sock_accept,
4146 .getname = l2cap_sock_getname,
4147 .sendmsg = l2cap_sock_sendmsg,
f66dc81f 4148 .recvmsg = l2cap_sock_recvmsg,
1da177e4 4149 .poll = bt_sock_poll,
3241ad82 4150 .ioctl = bt_sock_ioctl,
1da177e4
LT		 4151 .mmap = sock_no_mmap,
4152 .socketpair = sock_no_socketpair,
1da177e4
LT		 4153 .shutdown = l2cap_sock_shutdown,
4154 .setsockopt = l2cap_sock_setsockopt,
4155 .getsockopt = l2cap_sock_getsockopt
4156};
4157
ec1b4cf7 4158static const struct net_proto_family l2cap_sock_family_ops = {
1da177e4
LT		 4159 .family = PF_BLUETOOTH,
4160 .owner = THIS_MODULE,
4161 .create = l2cap_sock_create,
4162};
4163
4164static struct hci_proto l2cap_hci_proto = {
4165 .name = "L2CAP",
4166 .id = HCI_PROTO_L2CAP,
4167 .connect_ind = l2cap_connect_ind,
4168 .connect_cfm = l2cap_connect_cfm,
4169 .disconn_ind = l2cap_disconn_ind,
2950f21a 4170 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4171 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4172 .recv_acldata = l2cap_recv_acldata
4173};
4174
4175static int __init l2cap_init(void)
4176{
4177 int err;
be9d1227 4178
1da177e4
LT		 4179 err = proto_register(&l2cap_proto, 0);
4180 if (err < 0)
4181 return err;
4182
4183 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4184 if (err < 0) {
4185 BT_ERR("L2CAP socket registration failed");
4186 goto error;
4187 }
4188
4189 err = hci_register_proto(&l2cap_hci_proto);
4190 if (err < 0) {
4191 BT_ERR("L2CAP protocol registration failed");
4192 bt_sock_unregister(BTPROTO_L2CAP);
4193 goto error;
4194 }
4195
aef7d97c
MH		 4196 if (bt_debugfs) {
4197 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4198 bt_debugfs, NULL, &l2cap_debugfs_fops);
4199 if (!l2cap_debugfs)
4200 BT_ERR("Failed to create L2CAP debug file");
4201 }
1da177e4
LT		 4202
4203 BT_INFO("L2CAP ver %s", VERSION);
4204 BT_INFO("L2CAP socket layer initialized");
4205
4206 return 0;
4207
4208error:
4209 proto_unregister(&l2cap_proto);
4210 return err;
4211}
4212
4213static void __exit l2cap_exit(void)
4214{
aef7d97c 4215 debugfs_remove(l2cap_debugfs);
1da177e4
LT		 4216
4217 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4218 BT_ERR("L2CAP socket unregistration failed");
4219
4220 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4221 BT_ERR("L2CAP protocol unregistration failed");
4222
4223 proto_unregister(&l2cap_proto);
4224}
4225
4226void l2cap_load(void)
4227{
4228 /* Dummy function to trigger automatic L2CAP module loading by
4229 * other modules that use L2CAP sockets but don't use any other
4230 * symbols from it. */
4231 return;
4232}
4233EXPORT_SYMBOL(l2cap_load);
4234
4235module_init(l2cap_init);
4236module_exit(l2cap_exit);
4237
44dd46de
MH		 4238module_param(enable_ertm, bool, 0644);
4239MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
4240
5fbcd3d1
MH		 4241module_param(max_transmit, uint, 0644);
4242MODULE_PARM_DESC(max_transmit, "Max transmit value (default = 3)");
4243
63fbd24e 4244MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 4245MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4246MODULE_VERSION(VERSION);
4247MODULE_LICENSE("GPL");
4248MODULE_ALIAS("bt-proto-0");
kernel source for telekom puls (alcatel/mediatek)