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Bluetooth: Finish implementation for Rec RR (P=1) on ERTM
[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
0565c1c2
GP		 2238static inline void l2cap_ertm_init(struct sock *sk)
2239{
2240 l2cap_pi(sk)->expected_ack_seq = 0;
2241 l2cap_pi(sk)->unacked_frames = 0;
2242 l2cap_pi(sk)->buffer_seq = 0;
2243 l2cap_pi(sk)->num_to_ack = 0;
d5392c8f 2244 l2cap_pi(sk)->frames_sent = 0;
0565c1c2
GP		 2245
2246 setup_timer(&l2cap_pi(sk)->retrans_timer,
2247 l2cap_retrans_timeout, (unsigned long) sk);
2248 setup_timer(&l2cap_pi(sk)->monitor_timer,
2249 l2cap_monitor_timeout, (unsigned long) sk);
2250
2251 __skb_queue_head_init(SREJ_QUEUE(sk));
2252}
2253
f2fcfcd6
GP		 2254static int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
2255{
2256 u32 local_feat_mask = l2cap_feat_mask;
2257 if (enable_ertm)
6840ed07 2258 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
f2fcfcd6
GP		 2259
2260 switch (mode) {
2261 case L2CAP_MODE_ERTM:
2262 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
2263 case L2CAP_MODE_STREAMING:
2264 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
2265 default:
2266 return 0x00;
2267 }
2268}
2269
2270static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
2271{
2272 switch (mode) {
2273 case L2CAP_MODE_STREAMING:
2274 case L2CAP_MODE_ERTM:
2275 if (l2cap_mode_supported(mode, remote_feat_mask))
2276 return mode;
2277 /* fall through */
2278 default:
2279 return L2CAP_MODE_BASIC;
2280 }
2281}
2282
1da177e4
LT		 2283static int l2cap_build_conf_req(struct sock *sk, void *data)
2284{
2285 struct l2cap_pinfo *pi = l2cap_pi(sk);
2286 struct l2cap_conf_req *req = data;
a0e55a32 2287 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
1da177e4
LT		 2288 void *ptr = req->data;
2289
2290 BT_DBG("sk %p", sk);
2291
f2fcfcd6
GP		 2292 if (pi->num_conf_req || pi->num_conf_rsp)
2293 goto done;
2294
2295 switch (pi->mode) {
2296 case L2CAP_MODE_STREAMING:
2297 case L2CAP_MODE_ERTM:
2298 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
22121fc9
GP		 2299 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
2300 l2cap_send_disconn_req(pi->conn, sk);
f2fcfcd6
GP		 2301 break;
2302 default:
2303 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2304 break;
2305 }
2306
2307done:
65c7c491
MH		 2308 switch (pi->mode) {
2309 case L2CAP_MODE_BASIC:
2310 if (pi->imtu != L2CAP_DEFAULT_MTU)
2311 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu);
2312 break;
2313
2314 case L2CAP_MODE_ERTM:
2315 rfc.mode = L2CAP_MODE_ERTM;
f2fcfcd6 2316 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
5fbcd3d1 2317 rfc.max_transmit = max_transmit;
f2fcfcd6
GP		 2318 rfc.retrans_timeout = 0;
2319 rfc.monitor_timeout = 0;
c74e560c 2320 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091
GP		 2321 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
2322 rfc.max_pdu_size = pi->conn->mtu - 10;
f2fcfcd6
GP		 2323
2324 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2325 sizeof(rfc), (unsigned long) &rfc);
fcc203c3
GP		 2326
2327 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2328 break;
2329
2330 if (pi->fcs == L2CAP_FCS_NONE ||
2331 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2332 pi->fcs = L2CAP_FCS_NONE;
2333 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2334 }
f2fcfcd6
GP		 2335 break;
2336
2337 case L2CAP_MODE_STREAMING:
2338 rfc.mode = L2CAP_MODE_STREAMING;
2339 rfc.txwin_size = 0;
2340 rfc.max_transmit = 0;
2341 rfc.retrans_timeout = 0;
2342 rfc.monitor_timeout = 0;
c74e560c 2343 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
d1daa091
GP		 2344 if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10)
2345 rfc.max_pdu_size = pi->conn->mtu - 10;
65c7c491
MH		 2346
2347 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2348 sizeof(rfc), (unsigned long) &rfc);
fcc203c3
GP		 2349
2350 if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS))
2351 break;
2352
2353 if (pi->fcs == L2CAP_FCS_NONE ||
2354 pi->conf_state & L2CAP_CONF_NO_FCS_RECV) {
2355 pi->fcs = L2CAP_FCS_NONE;
2356 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs);
2357 }
65c7c491
MH		 2358 break;
2359 }
1da177e4
LT		 2360
2361 /* FIXME: Need actual value of the flush timeout */
2362 //if (flush_to != L2CAP_DEFAULT_FLUSH_TO)
2363 // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to);
2364
aca3192c
YH		 2365 req->dcid = cpu_to_le16(pi->dcid);
2366 req->flags = cpu_to_le16(0);
1da177e4
LT		 2367
2368 return ptr - data;
2369}
2370
5dee9e7c 2371static int l2cap_parse_conf_req(struct sock *sk, void *data)
1da177e4
LT		 2372{
2373 struct l2cap_pinfo *pi = l2cap_pi(sk);
5dee9e7c
MH		 2374 struct l2cap_conf_rsp *rsp = data;
2375 void *ptr = rsp->data;
2376 void *req = pi->conf_req;
2377 int len = pi->conf_len;
2378 int type, hint, olen;
2379 unsigned long val;
6464f35f 2380 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
861d6882 2381 u16 mtu = L2CAP_DEFAULT_MTU;
5dee9e7c 2382 u16 result = L2CAP_CONF_SUCCESS;
1da177e4 2383
5dee9e7c 2384 BT_DBG("sk %p", sk);
820ae1b8 2385
5dee9e7c
MH		 2386 while (len >= L2CAP_CONF_OPT_SIZE) {
2387 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1da177e4 2388
589d2746 2389 hint = type & L2CAP_CONF_HINT;
47ec1dcd 2390 type &= L2CAP_CONF_MASK;
5dee9e7c
MH		 2391
2392 switch (type) {
2393 case L2CAP_CONF_MTU:
861d6882 2394 mtu = val;
5dee9e7c
MH		 2395 break;
2396
2397 case L2CAP_CONF_FLUSH_TO:
2398 pi->flush_to = val;
2399 break;
2400
2401 case L2CAP_CONF_QOS:
2402 break;
2403
6464f35f
MH		 2404 case L2CAP_CONF_RFC:
2405 if (olen == sizeof(rfc))
2406 memcpy(&rfc, (void *) val, olen);
2407 break;
2408
fcc203c3
GP		 2409 case L2CAP_CONF_FCS:
2410 if (val == L2CAP_FCS_NONE)
2411 pi->conf_state |= L2CAP_CONF_NO_FCS_RECV;
2412
2413 break;
2414
5dee9e7c
MH		 2415 default:
2416 if (hint)
2417 break;
2418
2419 result = L2CAP_CONF_UNKNOWN;
2420 *((u8 *) ptr++) = type;
2421 break;
2422 }
2423 }
2424
f2fcfcd6
GP		 2425 if (pi->num_conf_rsp || pi->num_conf_req)
2426 goto done;
2427
2428 switch (pi->mode) {
2429 case L2CAP_MODE_STREAMING:
2430 case L2CAP_MODE_ERTM:
2431 pi->conf_state |= L2CAP_CONF_STATE2_DEVICE;
2432 if (!l2cap_mode_supported(pi->mode, pi->conn->feat_mask))
2433 return -ECONNREFUSED;
2434 break;
2435 default:
2436 pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
2437 break;
2438 }
2439
2440done:
2441 if (pi->mode != rfc.mode) {
2442 result = L2CAP_CONF_UNACCEPT;
2443 rfc.mode = pi->mode;
2444
2445 if (pi->num_conf_rsp == 1)
2446 return -ECONNREFUSED;
2447
2448 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2449 sizeof(rfc), (unsigned long) &rfc);
2450 }
2451
2452
5dee9e7c
MH		 2453 if (result == L2CAP_CONF_SUCCESS) {
2454 /* Configure output options and let the other side know
2455 * which ones we don't like. */
2456
f2fcfcd6
GP		 2457 if (mtu < L2CAP_DEFAULT_MIN_MTU)
2458 result = L2CAP_CONF_UNACCEPT;
2459 else {
2460 pi->omtu = mtu;
2461 pi->conf_state |= L2CAP_CONF_MTU_DONE;
2462 }
2463 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
6464f35f 2464
f2fcfcd6
GP		 2465 switch (rfc.mode) {
2466 case L2CAP_MODE_BASIC:
2467 pi->fcs = L2CAP_FCS_NONE;
2468 pi->conf_state |= L2CAP_CONF_MODE_DONE;
2469 break;
2470
2471 case L2CAP_MODE_ERTM:
2472 pi->remote_tx_win = rfc.txwin_size;
2473 pi->remote_max_tx = rfc.max_transmit;
2474 pi->max_pdu_size = rfc.max_pdu_size;
2475
2476 rfc.retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
2477 rfc.monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
2478
2479 pi->conf_state |= L2CAP_CONF_MODE_DONE;
68ae6639
GP		 2480
2481 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2482 sizeof(rfc), (unsigned long) &rfc);
2483
f2fcfcd6
GP		 2484 break;
2485
2486 case L2CAP_MODE_STREAMING:
2487 pi->remote_tx_win = rfc.txwin_size;
2488 pi->max_pdu_size = rfc.max_pdu_size;
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 default:
5dee9e7c 2498 result = L2CAP_CONF_UNACCEPT;
5dee9e7c 2499
6464f35f 2500 memset(&rfc, 0, sizeof(rfc));
f2fcfcd6
GP		 2501 rfc.mode = pi->mode;
2502 }
6464f35f 2503
f2fcfcd6
GP		 2504 if (result == L2CAP_CONF_SUCCESS)
2505 pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
2506 }
5dee9e7c
MH		 2507 rsp->scid = cpu_to_le16(pi->dcid);
2508 rsp->result = cpu_to_le16(result);
2509 rsp->flags = cpu_to_le16(0x0000);
2510
2511 return ptr - data;
1da177e4
LT		 2512}
2513
f2fcfcd6
GP		 2514static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result)
2515{
2516 struct l2cap_pinfo *pi = l2cap_pi(sk);
2517 struct l2cap_conf_req *req = data;
2518 void *ptr = req->data;
2519 int type, olen;
2520 unsigned long val;
2521 struct l2cap_conf_rfc rfc;
2522
2523 BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data);
2524
2525 while (len >= L2CAP_CONF_OPT_SIZE) {
2526 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2527
2528 switch (type) {
2529 case L2CAP_CONF_MTU:
2530 if (val < L2CAP_DEFAULT_MIN_MTU) {
2531 *result = L2CAP_CONF_UNACCEPT;
2532 pi->omtu = L2CAP_DEFAULT_MIN_MTU;
2533 } else
2534 pi->omtu = val;
2535 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
2536 break;
2537
2538 case L2CAP_CONF_FLUSH_TO:
2539 pi->flush_to = val;
2540 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
2541 2, pi->flush_to);
2542 break;
2543
2544 case L2CAP_CONF_RFC:
2545 if (olen == sizeof(rfc))
2546 memcpy(&rfc, (void *)val, olen);
2547
2548 if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
2549 rfc.mode != pi->mode)
2550 return -ECONNREFUSED;
2551
2552 pi->mode = rfc.mode;
2553 pi->fcs = 0;
2554
2555 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
2556 sizeof(rfc), (unsigned long) &rfc);
2557 break;
2558 }
2559 }
2560
2561 if (*result == L2CAP_CONF_SUCCESS) {
2562 switch (rfc.mode) {
2563 case L2CAP_MODE_ERTM:
2564 pi->remote_tx_win = rfc.txwin_size;
2565 pi->retrans_timeout = rfc.retrans_timeout;
2566 pi->monitor_timeout = rfc.monitor_timeout;
2567 pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
2568 break;
2569 case L2CAP_MODE_STREAMING:
2570 pi->max_pdu_size = le16_to_cpu(rfc.max_pdu_size);
2571 break;
2572 }
2573 }
2574
2575 req->dcid = cpu_to_le16(pi->dcid);
2576 req->flags = cpu_to_le16(0x0000);
2577
2578 return ptr - data;
2579}
2580
5dee9e7c 2581static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags)
1da177e4
LT		 2582{
2583 struct l2cap_conf_rsp *rsp = data;
2584 void *ptr = rsp->data;
1da177e4 2585
5dee9e7c 2586 BT_DBG("sk %p", sk);
1da177e4 2587
aca3192c 2588 rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid);
5dee9e7c 2589 rsp->result = cpu_to_le16(result);
aca3192c 2590 rsp->flags = cpu_to_le16(flags);
1da177e4
LT		 2591
2592 return ptr - data;
2593}
2594
4e8402a3
MH		 2595static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2596{
2597 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2598
2599 if (rej->reason != 0x0000)
2600 return 0;
2601
2602 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2603 cmd->ident == conn->info_ident) {
4e8402a3 2604 del_timer(&conn->info_timer);
984947dc
MH		 2605
2606 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 2607 conn->info_ident = 0;
984947dc 2608
4e8402a3
MH		 2609 l2cap_conn_start(conn);
2610 }
2611
2612 return 0;
2613}
2614
1da177e4
LT		 2615static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2616{
2617 struct l2cap_chan_list *list = &conn->chan_list;
2618 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2619 struct l2cap_conn_rsp rsp;
2620 struct sock *sk, *parent;
e7c29cb1 2621 int result, status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2622
2623 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
e7c29cb1 2624 __le16 psm = req->psm;
1da177e4
LT		 2625
2626 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2627
2628 /* Check if we have socket listening on psm */
2629 parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src);
2630 if (!parent) {
2631 result = L2CAP_CR_BAD_PSM;
2632 goto sendresp;
2633 }
2634
e7c29cb1
MH		 2635 /* Check if the ACL is secure enough (if not SDP) */
2636 if (psm != cpu_to_le16(0x0001) &&
2637 !hci_conn_check_link_mode(conn->hcon)) {
2950f21a 2638 conn->disc_reason = 0x05;
e7c29cb1
MH		 2639 result = L2CAP_CR_SEC_BLOCK;
2640 goto response;
2641 }
2642
1da177e4
LT		 2643 result = L2CAP_CR_NO_MEM;
2644
2645 /* Check for backlog size */
2646 if (sk_acceptq_is_full(parent)) {
8e87d142 2647 BT_DBG("backlog full %d", parent->sk_ack_backlog);
1da177e4
LT		 2648 goto response;
2649 }
2650
3b1e0a65 2651 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
1da177e4
LT		 2652 if (!sk)
2653 goto response;
2654
fd1278d7 2655 write_lock_bh(&list->lock);
1da177e4
LT		 2656
2657 /* Check if we already have channel with that dcid */
2658 if (__l2cap_get_chan_by_dcid(list, scid)) {
fd1278d7 2659 write_unlock_bh(&list->lock);
1da177e4
LT		 2660 sock_set_flag(sk, SOCK_ZAPPED);
2661 l2cap_sock_kill(sk);
2662 goto response;
2663 }
2664
2665 hci_conn_hold(conn->hcon);
2666
2667 l2cap_sock_init(sk, parent);
2668 bacpy(&bt_sk(sk)->src, conn->src);
2669 bacpy(&bt_sk(sk)->dst, conn->dst);
2670 l2cap_pi(sk)->psm = psm;
2671 l2cap_pi(sk)->dcid = scid;
2672
2673 __l2cap_chan_add(conn, sk, parent);
2674 dcid = l2cap_pi(sk)->scid;
2675
2676 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2677
1da177e4
LT		 2678 l2cap_pi(sk)->ident = cmd->ident;
2679
984947dc 2680 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2af6b9d5 2681 if (l2cap_check_security(sk)) {
f66dc81f
MH		 2682 if (bt_sk(sk)->defer_setup) {
2683 sk->sk_state = BT_CONNECT2;
2684 result = L2CAP_CR_PEND;
2685 status = L2CAP_CS_AUTHOR_PEND;
2686 parent->sk_data_ready(parent, 0);
2687 } else {
2688 sk->sk_state = BT_CONFIG;
2689 result = L2CAP_CR_SUCCESS;
2690 status = L2CAP_CS_NO_INFO;
2691 }
79d554a6
MH		 2692 } else {
2693 sk->sk_state = BT_CONNECT2;
2694 result = L2CAP_CR_PEND;
2695 status = L2CAP_CS_AUTHEN_PEND;
2696 }
2697 } else {
2698 sk->sk_state = BT_CONNECT2;
2699 result = L2CAP_CR_PEND;
2700 status = L2CAP_CS_NO_INFO;
1da177e4
LT		 2701 }
2702
fd1278d7 2703 write_unlock_bh(&list->lock);
1da177e4
LT		 2704
2705response:
2706 bh_unlock_sock(parent);
2707
2708sendresp:
aca3192c
YH		 2709 rsp.scid = cpu_to_le16(scid);
2710 rsp.dcid = cpu_to_le16(dcid);
2711 rsp.result = cpu_to_le16(result);
2712 rsp.status = cpu_to_le16(status);
1da177e4 2713 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
79d554a6
MH		 2714
2715 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2716 struct l2cap_info_req info;
2717 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2718
2719 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2720 conn->info_ident = l2cap_get_ident(conn);
2721
2722 mod_timer(&conn->info_timer, jiffies +
2723 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2724
2725 l2cap_send_cmd(conn, conn->info_ident,
2726 L2CAP_INFO_REQ, sizeof(info), &info);
2727 }
2728
1da177e4
LT		 2729 return 0;
2730}
2731
2732static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2733{
2734 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2735 u16 scid, dcid, result, status;
2736 struct sock *sk;
2737 u8 req[128];
2738
2739 scid = __le16_to_cpu(rsp->scid);
2740 dcid = __le16_to_cpu(rsp->dcid);
2741 result = __le16_to_cpu(rsp->result);
2742 status = __le16_to_cpu(rsp->status);
2743
2744 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2745
2746 if (scid) {
af05b30b
GP		 2747 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2748 if (!sk)
1da177e4
LT		 2749 return 0;
2750 } else {
af05b30b
GP		 2751 sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident);
2752 if (!sk)
1da177e4
LT		 2753 return 0;
2754 }
2755
2756 switch (result) {
2757 case L2CAP_CR_SUCCESS:
2758 sk->sk_state = BT_CONFIG;
2759 l2cap_pi(sk)->ident = 0;
2760 l2cap_pi(sk)->dcid = dcid;
2761 l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT;
2762
6a8d3010
MH		 2763 l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
2764
1da177e4
LT		 2765 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2766 l2cap_build_conf_req(sk, req), req);
f2fcfcd6 2767 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 2768 break;
2769
2770 case L2CAP_CR_PEND:
6a8d3010 2771 l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND;
1da177e4
LT		 2772 break;
2773
2774 default:
2775 l2cap_chan_del(sk, ECONNREFUSED);
2776 break;
2777 }
2778
2779 bh_unlock_sock(sk);
2780 return 0;
2781}
2782
88219a0f 2783static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
1da177e4
LT		 2784{
2785 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2786 u16 dcid, flags;
2787 u8 rsp[64];
2788 struct sock *sk;
5dee9e7c 2789 int len;
1da177e4
LT		 2790
2791 dcid = __le16_to_cpu(req->dcid);
2792 flags = __le16_to_cpu(req->flags);
2793
2794 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2795
af05b30b
GP		 2796 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
2797 if (!sk)
1da177e4
LT		 2798 return -ENOENT;
2799
354f60a9
MH		 2800 if (sk->sk_state == BT_DISCONN)
2801 goto unlock;
2802
5dee9e7c 2803 /* Reject if config buffer is too small. */
88219a0f 2804 len = cmd_len - sizeof(*req);
5dee9e7c
MH		 2805 if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) {
2806 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2807 l2cap_build_conf_rsp(sk, rsp,
2808 L2CAP_CONF_REJECT, flags), rsp);
2809 goto unlock;
2810 }
2811
2812 /* Store config. */
2813 memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len);
2814 l2cap_pi(sk)->conf_len += len;
1da177e4
LT		 2815
2816 if (flags & 0x0001) {
2817 /* Incomplete config. Send empty response. */
2818 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
5dee9e7c
MH		 2819 l2cap_build_conf_rsp(sk, rsp,
2820 L2CAP_CONF_SUCCESS, 0x0001), rsp);
1da177e4
LT		 2821 goto unlock;
2822 }
2823
2824 /* Complete config. */
5dee9e7c 2825 len = l2cap_parse_conf_req(sk, rsp);
f2fcfcd6 2826 if (len < 0) {
22121fc9 2827 l2cap_send_disconn_req(conn, sk);
1da177e4 2828 goto unlock;
f2fcfcd6 2829 }
1da177e4 2830
5dee9e7c 2831 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
f2fcfcd6 2832 l2cap_pi(sk)->num_conf_rsp++;
5dee9e7c 2833
5dee9e7c
MH		 2834 /* Reset config buffer. */
2835 l2cap_pi(sk)->conf_len = 0;
2836
876d9484
MH		 2837 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
2838 goto unlock;
2839
1da177e4 2840 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
f64f9e71
JP		 2841 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
2842 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 2843 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
2844
1da177e4 2845 sk->sk_state = BT_CONNECTED;
e90bac06 2846
0565c1c2
GP		 2847 l2cap_pi(sk)->next_tx_seq = 0;
2848 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 2849 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 2850 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2851 l2cap_ertm_init(sk);
2852
1da177e4 2853 l2cap_chan_ready(sk);
876d9484
MH		 2854 goto unlock;
2855 }
2856
2857 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
79d554a6 2858 u8 buf[64];
1da177e4 2859 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
79d554a6 2860 l2cap_build_conf_req(sk, buf), buf);
f2fcfcd6 2861 l2cap_pi(sk)->num_conf_req++;
1da177e4
LT		 2862 }
2863
2864unlock:
2865 bh_unlock_sock(sk);
2866 return 0;
2867}
2868
2869static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2870{
2871 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2872 u16 scid, flags, result;
2873 struct sock *sk;
2874
2875 scid = __le16_to_cpu(rsp->scid);
2876 flags = __le16_to_cpu(rsp->flags);
2877 result = __le16_to_cpu(rsp->result);
2878
af05b30b
GP		 2879 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2880 scid, flags, result);
1da177e4 2881
af05b30b
GP		 2882 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2883 if (!sk)
1da177e4
LT		 2884 return 0;
2885
2886 switch (result) {
2887 case L2CAP_CONF_SUCCESS:
2888 break;
2889
2890 case L2CAP_CONF_UNACCEPT:
f2fcfcd6
GP		 2891 if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
2892 int len = cmd->len - sizeof(*rsp);
2893 char req[64];
2894
c2c77ec8
AE		 2895 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
2896 l2cap_send_disconn_req(conn, sk);
2897 goto done;
2898 }
2899
f2fcfcd6
GP		 2900 /* throw out any old stored conf requests */
2901 result = L2CAP_CONF_SUCCESS;
2902 len = l2cap_parse_conf_rsp(sk, rsp->data,
2903 len, req, &result);
2904 if (len < 0) {
22121fc9 2905 l2cap_send_disconn_req(conn, sk);
f2fcfcd6
GP		 2906 goto done;
2907 }
2908
2909 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2910 L2CAP_CONF_REQ, len, req);
2911 l2cap_pi(sk)->num_conf_req++;
2912 if (result != L2CAP_CONF_SUCCESS)
2913 goto done;
2914 break;
1da177e4
LT		 2915 }
2916
8e87d142 2917 default:
1da177e4 2918 sk->sk_state = BT_DISCONN;
b1235d79 2919 sk->sk_err = ECONNRESET;
1da177e4 2920 l2cap_sock_set_timer(sk, HZ * 5);
22121fc9 2921 l2cap_send_disconn_req(conn, sk);
1da177e4
LT		 2922 goto done;
2923 }
2924
2925 if (flags & 0x01)
2926 goto done;
2927
1da177e4
LT		 2928 l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
2929
2930 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {
f64f9e71
JP		 2931 if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) ||
2932 l2cap_pi(sk)->fcs != L2CAP_FCS_NONE)
fcc203c3
GP		 2933 l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16;
2934
1da177e4 2935 sk->sk_state = BT_CONNECTED;
0565c1c2 2936 l2cap_pi(sk)->next_tx_seq = 0;
1c2acffb 2937 l2cap_pi(sk)->expected_tx_seq = 0;
1c2acffb 2938 __skb_queue_head_init(TX_QUEUE(sk));
0565c1c2
GP		 2939 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM)
2940 l2cap_ertm_init(sk);
2941
1da177e4
LT		 2942 l2cap_chan_ready(sk);
2943 }
2944
2945done:
2946 bh_unlock_sock(sk);
2947 return 0;
2948}
2949
2950static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2951{
2952 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
2953 struct l2cap_disconn_rsp rsp;
2954 u16 dcid, scid;
2955 struct sock *sk;
2956
2957 scid = __le16_to_cpu(req->scid);
2958 dcid = __le16_to_cpu(req->dcid);
2959
2960 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
2961
af05b30b
GP		 2962 sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid);
2963 if (!sk)
1da177e4
LT		 2964 return 0;
2965
aca3192c
YH		 2966 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
2967 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
1da177e4
LT		 2968 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
2969
2970 sk->sk_shutdown = SHUTDOWN_MASK;
2971
1c2acffb 2972 skb_queue_purge(TX_QUEUE(sk));
0565c1c2
GP		 2973
2974 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
2975 skb_queue_purge(SREJ_QUEUE(sk));
2976 del_timer(&l2cap_pi(sk)->retrans_timer);
2977 del_timer(&l2cap_pi(sk)->monitor_timer);
2978 }
1c2acffb 2979
1da177e4
LT		 2980 l2cap_chan_del(sk, ECONNRESET);
2981 bh_unlock_sock(sk);
2982
2983 l2cap_sock_kill(sk);
2984 return 0;
2985}
2986
2987static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2988{
2989 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
2990 u16 dcid, scid;
2991 struct sock *sk;
2992
2993 scid = __le16_to_cpu(rsp->scid);
2994 dcid = __le16_to_cpu(rsp->dcid);
2995
2996 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
2997
af05b30b
GP		 2998 sk = l2cap_get_chan_by_scid(&conn->chan_list, scid);
2999 if (!sk)
1da177e4
LT		 3000 return 0;
3001
1c2acffb 3002 skb_queue_purge(TX_QUEUE(sk));
0565c1c2
GP		 3003
3004 if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) {
3005 skb_queue_purge(SREJ_QUEUE(sk));
3006 del_timer(&l2cap_pi(sk)->retrans_timer);
3007 del_timer(&l2cap_pi(sk)->monitor_timer);
3008 }
1c2acffb 3009
1da177e4
LT		 3010 l2cap_chan_del(sk, 0);
3011 bh_unlock_sock(sk);
3012
3013 l2cap_sock_kill(sk);
3014 return 0;
3015}
3016
3017static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3018{
3019 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
1da177e4
LT		 3020 u16 type;
3021
3022 type = __le16_to_cpu(req->type);
3023
3024 BT_DBG("type 0x%4.4x", type);
3025
f0709e03
MH		 3026 if (type == L2CAP_IT_FEAT_MASK) {
3027 u8 buf[8];
44dd46de 3028 u32 feat_mask = l2cap_feat_mask;
f0709e03
MH		 3029 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3030 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3031 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
44dd46de 3032 if (enable_ertm)
fcc203c3
GP		 3033 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
3034 | L2CAP_FEAT_FCS;
1b7bf4ed 3035 put_unaligned_le32(feat_mask, rsp->data);
f0709e03
MH		 3036 l2cap_send_cmd(conn, cmd->ident,
3037 L2CAP_INFO_RSP, sizeof(buf), buf);
e1027a7c
MH		 3038 } else if (type == L2CAP_IT_FIXED_CHAN) {
3039 u8 buf[12];
3040 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
3041 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3042 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
3043 memcpy(buf + 4, l2cap_fixed_chan, 8);
3044 l2cap_send_cmd(conn, cmd->ident,
3045 L2CAP_INFO_RSP, sizeof(buf), buf);
f0709e03
MH		 3046 } else {
3047 struct l2cap_info_rsp rsp;
3048 rsp.type = cpu_to_le16(type);
3049 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
3050 l2cap_send_cmd(conn, cmd->ident,
3051 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
3052 }
1da177e4
LT		 3053
3054 return 0;
3055}
3056
3057static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
3058{
3059 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
3060 u16 type, result;
3061
3062 type = __le16_to_cpu(rsp->type);
3063 result = __le16_to_cpu(rsp->result);
3064
3065 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
3066
4e8402a3
MH		 3067 del_timer(&conn->info_timer);
3068
984947dc 3069 if (type == L2CAP_IT_FEAT_MASK) {
83985319 3070 conn->feat_mask = get_unaligned_le32(rsp->data);
4e8402a3 3071
47ec1dcd 3072 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
e1027a7c
MH		 3073 struct l2cap_info_req req;
3074 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
3075
3076 conn->info_ident = l2cap_get_ident(conn);
3077
3078 l2cap_send_cmd(conn, conn->info_ident,
3079 L2CAP_INFO_REQ, sizeof(req), &req);
3080 } else {
3081 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3082 conn->info_ident = 0;
3083
3084 l2cap_conn_start(conn);
3085 }
3086 } else if (type == L2CAP_IT_FIXED_CHAN) {
984947dc 3087 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
e1027a7c 3088 conn->info_ident = 0;
984947dc
MH		 3089
3090 l2cap_conn_start(conn);
3091 }
4e8402a3 3092
1da177e4
LT		 3093 return 0;
3094}
3095
3096static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
3097{
3098 u8 *data = skb->data;
3099 int len = skb->len;
3100 struct l2cap_cmd_hdr cmd;
3101 int err = 0;
3102
3103 l2cap_raw_recv(conn, skb);
3104
3105 while (len >= L2CAP_CMD_HDR_SIZE) {
88219a0f 3106 u16 cmd_len;
1da177e4
LT		 3107 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
3108 data += L2CAP_CMD_HDR_SIZE;
3109 len -= L2CAP_CMD_HDR_SIZE;
3110
88219a0f 3111 cmd_len = le16_to_cpu(cmd.len);
1da177e4 3112
88219a0f 3113 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
1da177e4 3114
88219a0f 3115 if (cmd_len > len || !cmd.ident) {
1da177e4
LT		 3116 BT_DBG("corrupted command");
3117 break;
3118 }
3119
3120 switch (cmd.code) {
3121 case L2CAP_COMMAND_REJ:
4e8402a3 3122 l2cap_command_rej(conn, &cmd, data);
1da177e4
LT		 3123 break;
3124
3125 case L2CAP_CONN_REQ:
3126 err = l2cap_connect_req(conn, &cmd, data);
3127 break;
3128
3129 case L2CAP_CONN_RSP:
3130 err = l2cap_connect_rsp(conn, &cmd, data);
3131 break;
3132
3133 case L2CAP_CONF_REQ:
88219a0f 3134 err = l2cap_config_req(conn, &cmd, cmd_len, data);
1da177e4
LT		 3135 break;
3136
3137 case L2CAP_CONF_RSP:
3138 err = l2cap_config_rsp(conn, &cmd, data);
3139 break;
3140
3141 case L2CAP_DISCONN_REQ:
3142 err = l2cap_disconnect_req(conn, &cmd, data);
3143 break;
3144
3145 case L2CAP_DISCONN_RSP:
3146 err = l2cap_disconnect_rsp(conn, &cmd, data);
3147 break;
3148
3149 case L2CAP_ECHO_REQ:
88219a0f 3150 l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data);
1da177e4
LT		 3151 break;
3152
3153 case L2CAP_ECHO_RSP:
3154 break;
3155
3156 case L2CAP_INFO_REQ:
3157 err = l2cap_information_req(conn, &cmd, data);
3158 break;
3159
3160 case L2CAP_INFO_RSP:
3161 err = l2cap_information_rsp(conn, &cmd, data);
3162 break;
3163
3164 default:
3165 BT_ERR("Unknown signaling command 0x%2.2x", cmd.code);
3166 err = -EINVAL;
3167 break;
3168 }
3169
3170 if (err) {
3171 struct l2cap_cmd_rej rej;
3172 BT_DBG("error %d", err);
3173
3174 /* FIXME: Map err to a valid reason */
aca3192c 3175 rej.reason = cpu_to_le16(0);
1da177e4
LT		 3176 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3177 }
3178
88219a0f
AV		 3179 data += cmd_len;
3180 len -= cmd_len;
1da177e4
LT		 3181 }
3182
3183 kfree_skb(skb);
3184}
3185
fcc203c3
GP		 3186static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb)
3187{
3188 u16 our_fcs, rcv_fcs;
3189 int hdr_size = L2CAP_HDR_SIZE + 2;
3190
3191 if (pi->fcs == L2CAP_FCS_CRC16) {
3192 skb_trim(skb, skb->len - 2);
3193 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
3194 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
3195
3196 if (our_fcs != rcv_fcs)
3197 return -EINVAL;
3198 }
3199 return 0;
3200}
3201
d5392c8f
GP		 3202static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk)
3203{
3204 struct l2cap_pinfo *pi = l2cap_pi(sk);
3205 u16 control = 0;
3206
3207 pi->frames_sent = 0;
3208 pi->conn_state |= L2CAP_CONN_SEND_FBIT;
3209
3210 control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3211
3212 if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3213 control |= L2CAP_SUPER_RCV_NOT_READY | L2CAP_CTRL_FINAL;
3214 l2cap_send_sframe(pi, control);
3215 pi->conn_state &= ~L2CAP_CONN_SEND_FBIT;
3216 }
3217
3218 if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && pi->unacked_frames > 0)
3219 __mod_retrans_timer();
3220
3221 l2cap_ertm_send(sk);
3222
3223 if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
3224 pi->frames_sent == 0) {
3225 control |= L2CAP_SUPER_RCV_READY;
d5392c8f
GP		 3226 l2cap_send_sframe(pi, control);
3227 }
3228}
3229
8f17154f
GP		 3230static void l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar)
3231{
3232 struct sk_buff *next_skb;
3233
3234 bt_cb(skb)->tx_seq = tx_seq;
3235 bt_cb(skb)->sar = sar;
3236
3237 next_skb = skb_peek(SREJ_QUEUE(sk));
3238 if (!next_skb) {
3239 __skb_queue_tail(SREJ_QUEUE(sk), skb);
3240 return;
3241 }
3242
3243 do {
3244 if (bt_cb(next_skb)->tx_seq > tx_seq) {
3245 __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb);
3246 return;
3247 }
3248
3249 if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb))
3250 break;
3251
3252 } while((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb)));
3253
3254 __skb_queue_tail(SREJ_QUEUE(sk), skb);
3255}
3256
c74e560c
GP		 3257static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control)
3258{
3259 struct l2cap_pinfo *pi = l2cap_pi(sk);
3260 struct sk_buff *_skb;
3261 int err = -EINVAL;
3262
3263 switch (control & L2CAP_CTRL_SAR) {
3264 case L2CAP_SDU_UNSEGMENTED:
3265 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3266 kfree_skb(pi->sdu);
3267 break;
3268 }
3269
3270 err = sock_queue_rcv_skb(sk, skb);
3271 if (!err)
3272 return 0;
3273
3274 break;
3275
3276 case L2CAP_SDU_START:
3277 if (pi->conn_state & L2CAP_CONN_SAR_SDU) {
3278 kfree_skb(pi->sdu);
3279 break;
3280 }
3281
3282 pi->sdu_len = get_unaligned_le16(skb->data);
3283 skb_pull(skb, 2);
3284
3285 pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
3286 if (!pi->sdu) {
3287 err = -ENOMEM;
3288 break;
3289 }
3290
3291 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3292
3293 pi->conn_state |= L2CAP_CONN_SAR_SDU;
3294 pi->partial_sdu_len = skb->len;
3295 err = 0;
3296 break;
3297
3298 case L2CAP_SDU_CONTINUE:
3299 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3300 break;
3301
3302 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3303
3304 pi->partial_sdu_len += skb->len;
3305 if (pi->partial_sdu_len > pi->sdu_len)
3306 kfree_skb(pi->sdu);
3307 else
3308 err = 0;
3309
3310 break;
3311
3312 case L2CAP_SDU_END:
3313 if (!(pi->conn_state & L2CAP_CONN_SAR_SDU))
3314 break;
3315
3316 memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len);
3317
3318 pi->conn_state &= ~L2CAP_CONN_SAR_SDU;
3319 pi->partial_sdu_len += skb->len;
3320
36f2fd58
GP		 3321 if (pi->partial_sdu_len > pi->imtu)
3322 goto drop;
3323
c74e560c
GP		 3324 if (pi->partial_sdu_len == pi->sdu_len) {
3325 _skb = skb_clone(pi->sdu, GFP_ATOMIC);
3326 err = sock_queue_rcv_skb(sk, _skb);
3327 if (err < 0)
3328 kfree_skb(_skb);
3329 }
c74e560c
GP		 3330 err = 0;
3331
36f2fd58
GP		 3332drop:
3333 kfree_skb(pi->sdu);
c74e560c
GP		 3334 break;
3335 }
3336
3337 kfree_skb(skb);
3338 return err;
3339}
3340
8f17154f
GP		 3341static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq)
3342{
3343 struct sk_buff *skb;
3344 u16 control = 0;
3345
3346 while((skb = skb_peek(SREJ_QUEUE(sk)))) {
3347 if (bt_cb(skb)->tx_seq != tx_seq)
3348 break;
3349
3350 skb = skb_dequeue(SREJ_QUEUE(sk));
3351 control |= bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3352 l2cap_sar_reassembly_sdu(sk, skb, control);
3353 l2cap_pi(sk)->buffer_seq_srej =
3354 (l2cap_pi(sk)->buffer_seq_srej + 1) % 64;
3355 tx_seq++;
3356 }
3357}
3358
3359static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq)
3360{
3361 struct l2cap_pinfo *pi = l2cap_pi(sk);
3362 struct srej_list *l, *tmp;
3363 u16 control;
3364
3365 list_for_each_entry_safe(l,tmp, SREJ_LIST(sk), list) {
3366 if (l->tx_seq == tx_seq) {
3367 list_del(&l->list);
3368 kfree(l);
3369 return;
3370 }
3371 control = L2CAP_SUPER_SELECT_REJECT;
3372 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3373 l2cap_send_sframe(pi, control);
3374 list_del(&l->list);
3375 list_add_tail(&l->list, SREJ_LIST(sk));
3376 }
3377}
3378
3379static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq)
3380{
3381 struct l2cap_pinfo *pi = l2cap_pi(sk);
3382 struct srej_list *new;
3383 u16 control;
3384
3385 while (tx_seq != pi->expected_tx_seq) {
3386 control = L2CAP_SUPER_SELECT_REJECT;
3387 control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3388 l2cap_send_sframe(pi, control);
3389
3390 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
3391 new->tx_seq = pi->expected_tx_seq++;
3392 list_add_tail(&new->list, SREJ_LIST(sk));
3393 }
3394 pi->expected_tx_seq++;
3395}
3396
1c2acffb
GP		 3397static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3398{
3399 struct l2cap_pinfo *pi = l2cap_pi(sk);
3400 u8 tx_seq = __get_txseq(rx_control);
9f121a5a 3401 u8 req_seq = __get_reqseq(rx_control);
8f17154f 3402 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
1c2acffb
GP		 3403 int err = 0;
3404
3405 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
3406
1d8f5d16
GP		 3407 if (L2CAP_CTRL_FINAL & rx_control) {
3408 del_timer(&pi->monitor_timer);
3409 if (pi->unacked_frames > 0)
3410 __mod_retrans_timer();
3411 pi->conn_state &= ~L2CAP_CONN_WAIT_F;
3412 }
3413
9f121a5a
GP		 3414 pi->expected_ack_seq = req_seq;
3415 l2cap_drop_acked_frames(sk);
3416
8f17154f
GP		 3417 if (tx_seq == pi->expected_tx_seq)
3418 goto expected;
1c2acffb 3419
8f17154f
GP		 3420 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3421 struct srej_list *first;
30afb5b2 3422
8f17154f
GP		 3423 first = list_first_entry(SREJ_LIST(sk),
3424 struct srej_list, list);
3425 if (tx_seq == first->tx_seq) {
3426 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3427 l2cap_check_srej_gap(sk, tx_seq);
3428
3429 list_del(&first->list);
3430 kfree(first);
3431
3432 if (list_empty(SREJ_LIST(sk))) {
3433 pi->buffer_seq = pi->buffer_seq_srej;
3434 pi->conn_state &= ~L2CAP_CONN_SREJ_SENT;
3435 }
3436 } else {
3437 struct srej_list *l;
3438 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3439
3440 list_for_each_entry(l, SREJ_LIST(sk), list) {
3441 if (l->tx_seq == tx_seq) {
3442 l2cap_resend_srejframe(sk, tx_seq);
3443 return 0;
3444 }
3445 }
3446 l2cap_send_srejframe(sk, tx_seq);
30afb5b2
GP		 3447 }
3448 } else {
8f17154f 3449 pi->conn_state |= L2CAP_CONN_SREJ_SENT;
1c2acffb 3450
8f17154f
GP		 3451 INIT_LIST_HEAD(SREJ_LIST(sk));
3452 pi->buffer_seq_srej = pi->buffer_seq;
3453
3454 __skb_queue_head_init(SREJ_QUEUE(sk));
3455 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3456
ef54fd93
GP		 3457 pi->conn_state |= L2CAP_CONN_SEND_PBIT;
3458
8f17154f 3459 l2cap_send_srejframe(sk, tx_seq);
1c2acffb 3460 }
30afb5b2
GP		 3461 return 0;
3462
8f17154f
GP		 3463expected:
3464 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3465
3466 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3467 l2cap_add_to_srej_queue(sk, skb, tx_seq, sar);
3468 return 0;
3469 }
3470
4ec10d97
GP		 3471 if (rx_control & L2CAP_CTRL_FINAL) {
3472 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3473 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3474 else {
3475 sk->sk_send_head = TX_QUEUE(sk)->next;
3476 pi->next_tx_seq = pi->expected_ack_seq;
3477 l2cap_ertm_send(sk);
3478 }
3479 }
3480
8f17154f
GP		 3481 pi->buffer_seq = (pi->buffer_seq + 1) % 64;
3482
3483 err = l2cap_sar_reassembly_sdu(sk, skb, rx_control);
3484 if (err < 0)
3485 return err;
3486
3487 pi->num_to_ack = (pi->num_to_ack + 1) % L2CAP_DEFAULT_NUM_TO_ACK;
9e917af1
GP		 3488 if (pi->num_to_ack == L2CAP_DEFAULT_NUM_TO_ACK - 1)
3489 l2cap_send_ack(pi);
3490
8f17154f 3491 return 0;
1c2acffb
GP		 3492}
3493
e072745f 3494static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control)
1c2acffb
GP		 3495{
3496 struct l2cap_pinfo *pi = l2cap_pi(sk);
6e3a5981
GP		 3497
3498 pi->expected_ack_seq = __get_reqseq(rx_control);
3499 l2cap_drop_acked_frames(sk);
1c2acffb 3500
e072745f 3501 if (rx_control & L2CAP_CTRL_POLL) {
05fbd89d
GP		 3502 if (pi->conn_state & L2CAP_CONN_SREJ_SENT) {
3503 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3504 (pi->unacked_frames > 0))
3505 __mod_retrans_timer();
3506
3507 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3508 l2cap_send_srejtail(sk);
3509 } else {
3510 l2cap_send_i_or_rr_or_rnr(sk);
3511 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3512 }
1d8f5d16 3513
e072745f
GP		 3514 } else if (rx_control & L2CAP_CTRL_FINAL) {
3515 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
4ec10d97 3516
e072745f
GP		 3517 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3518 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3519 else {
3520 sk->sk_send_head = TX_QUEUE(sk)->next;
3521 pi->next_tx_seq = pi->expected_ack_seq;
3522 l2cap_ertm_send(sk);
3523 }
2246b2f1 3524
e072745f 3525 } else {
e072745f
GP		 3526 if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3527 (pi->unacked_frames > 0))
3528 __mod_retrans_timer();
1c2acffb 3529
2246b2f1 3530 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
e072745f
GP		 3531 if (pi->conn_state & L2CAP_CONN_SREJ_SENT)
3532 l2cap_send_ack(pi);
3533 else
3534 l2cap_ertm_send(sk);
3535 }
3536}
2246b2f1 3537
e072745f
GP		 3538static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control)
3539{
3540 struct l2cap_pinfo *pi = l2cap_pi(sk);
3541 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 3542
e072745f
GP		 3543 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3544
8abb52ee 3545 pi->expected_ack_seq = tx_seq;
e072745f
GP		 3546 l2cap_drop_acked_frames(sk);
3547
3548 if (rx_control & L2CAP_CTRL_FINAL) {
3549 if (pi->conn_state & L2CAP_CONN_REJ_ACT)
3550 pi->conn_state &= ~L2CAP_CONN_REJ_ACT;
3551 else {
4ec10d97
GP		 3552 sk->sk_send_head = TX_QUEUE(sk)->next;
3553 pi->next_tx_seq = pi->expected_ack_seq;
3554 l2cap_ertm_send(sk);
4ec10d97 3555 }
e072745f
GP		 3556 } else {
3557 sk->sk_send_head = TX_QUEUE(sk)->next;
3558 pi->next_tx_seq = pi->expected_ack_seq;
3559 l2cap_ertm_send(sk);
30afb5b2 3560
e072745f
GP		 3561 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3562 pi->srej_save_reqseq = tx_seq;
3563 pi->conn_state |= L2CAP_CONN_REJ_ACT;
3564 }
3565 }
3566}
3567static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control)
3568{
3569 struct l2cap_pinfo *pi = l2cap_pi(sk);
3570 u8 tx_seq = __get_reqseq(rx_control);
30afb5b2 3571
e072745f 3572 pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
2246b2f1 3573
e072745f
GP		 3574 if (rx_control & L2CAP_CTRL_POLL) {
3575 pi->expected_ack_seq = tx_seq;
3576 l2cap_drop_acked_frames(sk);
3577 l2cap_retransmit_frame(sk, tx_seq);
3578 l2cap_ertm_send(sk);
3579 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3580 pi->srej_save_reqseq = tx_seq;
3581 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 3582 }
e072745f
GP		 3583 } else if (rx_control & L2CAP_CTRL_FINAL) {
3584 if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) &&
3585 pi->srej_save_reqseq == tx_seq)
3586 pi->conn_state &= ~L2CAP_CONN_SREJ_ACT;
3587 else
ef54fd93 3588 l2cap_retransmit_frame(sk, tx_seq);
e072745f
GP		 3589 } else {
3590 l2cap_retransmit_frame(sk, tx_seq);
3591 if (pi->conn_state & L2CAP_CONN_WAIT_F) {
3592 pi->srej_save_reqseq = tx_seq;
3593 pi->conn_state |= L2CAP_CONN_SREJ_ACT;
ef54fd93 3594 }
e072745f
GP		 3595 }
3596}
3597
3598static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control)
3599{
3600 struct l2cap_pinfo *pi = l2cap_pi(sk);
3601 u8 tx_seq = __get_reqseq(rx_control);
3602
3603 pi->conn_state |= L2CAP_CONN_REMOTE_BUSY;
3604 pi->expected_ack_seq = tx_seq;
3605 l2cap_drop_acked_frames(sk);
3606
99b0d4b7
GP		 3607 if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) {
3608 del_timer(&pi->retrans_timer);
3609 if (rx_control & L2CAP_CTRL_POLL) {
3610 u16 control = L2CAP_CTRL_FINAL;
3611 l2cap_send_rr_or_rnr(pi, control);
3612 }
3613 return;
e072745f 3614 }
99b0d4b7
GP		 3615
3616 if (rx_control & L2CAP_CTRL_POLL)
3617 l2cap_send_srejtail(sk);
3618 else
3619 l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY);
e072745f
GP		 3620}
3621
3622static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb)
3623{
3624 BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len);
3625
3626 if (L2CAP_CTRL_FINAL & rx_control) {
3627 del_timer(&l2cap_pi(sk)->monitor_timer);
3628 if (l2cap_pi(sk)->unacked_frames > 0)
3629 __mod_retrans_timer();
3630 l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F;
3631 }
3632
3633 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
3634 case L2CAP_SUPER_RCV_READY:
3635 l2cap_data_channel_rrframe(sk, rx_control);
8f17154f
GP		 3636 break;
3637
e072745f
GP		 3638 case L2CAP_SUPER_REJECT:
3639 l2cap_data_channel_rejframe(sk, rx_control);
3640 break;
2246b2f1 3641
e072745f
GP		 3642 case L2CAP_SUPER_SELECT_REJECT:
3643 l2cap_data_channel_srejframe(sk, rx_control);
3644 break;
3645
3646 case L2CAP_SUPER_RCV_NOT_READY:
3647 l2cap_data_channel_rnrframe(sk, rx_control);
1c2acffb
GP		 3648 break;
3649 }
3650
faaebd19 3651 kfree_skb(skb);
1c2acffb
GP		 3652 return 0;
3653}
3654
1da177e4
LT		 3655static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
3656{
3657 struct sock *sk;
6840ed07 3658 struct l2cap_pinfo *pi;
c74e560c 3659 u16 control, len;
6840ed07 3660 u8 tx_seq;
1da177e4
LT		 3661
3662 sk = l2cap_get_chan_by_scid(&conn->chan_list, cid);
3663 if (!sk) {
3664 BT_DBG("unknown cid 0x%4.4x", cid);
3665 goto drop;
3666 }
3667
6840ed07
GP		 3668 pi = l2cap_pi(sk);
3669
1da177e4
LT		 3670 BT_DBG("sk %p, len %d", sk, skb->len);
3671
3672 if (sk->sk_state != BT_CONNECTED)
3673 goto drop;
3674
6840ed07 3675 switch (pi->mode) {
1c2acffb
GP		 3676 case L2CAP_MODE_BASIC:
3677 /* If socket recv buffers overflows we drop data here
3678 * which is *bad* because L2CAP has to be reliable.
3679 * But we don't have any other choice. L2CAP doesn't
3680 * provide flow control mechanism. */
1da177e4 3681
6840ed07 3682 if (pi->imtu < skb->len)
1c2acffb 3683 goto drop;
1da177e4 3684
1c2acffb
GP		 3685 if (!sock_queue_rcv_skb(sk, skb))
3686 goto done;
3687 break;
3688
3689 case L2CAP_MODE_ERTM:
3690 control = get_unaligned_le16(skb->data);
3691 skb_pull(skb, 2);
c74e560c 3692 len = skb->len;
1c2acffb 3693
c74e560c
GP		 3694 if (__is_sar_start(control))
3695 len -= 2;
3696
fcc203c3
GP		 3697 if (pi->fcs == L2CAP_FCS_CRC16)
3698 len -= 2;
3699
30afb5b2
GP		 3700 /*
3701 * We can just drop the corrupted I-frame here.
3702 * Receiver will miss it and start proper recovery
3703 * procedures and ask retransmission.
3704 */
c74e560c 3705 if (len > L2CAP_DEFAULT_MAX_PDU_SIZE)
1c2acffb
GP		 3706 goto drop;
3707
fcc203c3
GP		 3708 if (l2cap_check_fcs(pi, skb))
3709 goto drop;
3710
277ffbe3
GP		 3711 if (__is_iframe(control)) {
3712 if (len < 4)
3713 goto drop;
3714
fcafde2e 3715 l2cap_data_channel_iframe(sk, control, skb);
277ffbe3
GP		 3716 } else {
3717 if (len != 0)
3718 goto drop;
3719
fcafde2e 3720 l2cap_data_channel_sframe(sk, control, skb);
277ffbe3 3721 }
1c2acffb 3722
fcafde2e 3723 goto done;
1c2acffb 3724
6840ed07
GP		 3725 case L2CAP_MODE_STREAMING:
3726 control = get_unaligned_le16(skb->data);
3727 skb_pull(skb, 2);
3728 len = skb->len;
3729
3730 if (__is_sar_start(control))
3731 len -= 2;
3732
fcc203c3
GP		 3733 if (pi->fcs == L2CAP_FCS_CRC16)
3734 len -= 2;
3735
277ffbe3
GP		 3736 if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || len < 4
3737 || __is_sframe(control))
6840ed07
GP		 3738 goto drop;
3739
fcc203c3
GP		 3740 if (l2cap_check_fcs(pi, skb))
3741 goto drop;
3742
6840ed07
GP		 3743 tx_seq = __get_txseq(control);
3744
3745 if (pi->expected_tx_seq == tx_seq)
3746 pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64;
3747 else
7dffe421 3748 pi->expected_tx_seq = (tx_seq + 1) % 64;
6840ed07 3749
fcafde2e 3750 l2cap_sar_reassembly_sdu(sk, skb, control);
6840ed07
GP		 3751
3752 goto done;
3753
1c2acffb 3754 default:
e8235c6b 3755 BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode);
1c2acffb
GP		 3756 break;
3757 }
1da177e4
LT		 3758
3759drop:
3760 kfree_skb(skb);
3761
3762done:
0139418c
MH		 3763 if (sk)
3764 bh_unlock_sock(sk);
3765
1da177e4
LT		 3766 return 0;
3767}
3768
8e036fc3 3769static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
1da177e4
LT		 3770{
3771 struct sock *sk;
3772
3773 sk = l2cap_get_sock_by_psm(0, psm, conn->src);
3774 if (!sk)
3775 goto drop;
3776
3777 BT_DBG("sk %p, len %d", sk, skb->len);
3778
3779 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
3780 goto drop;
3781
3782 if (l2cap_pi(sk)->imtu < skb->len)
3783 goto drop;
3784
3785 if (!sock_queue_rcv_skb(sk, skb))
3786 goto done;
3787
3788drop:
3789 kfree_skb(skb);
3790
3791done:
af05b30b
GP		 3792 if (sk)
3793 bh_unlock_sock(sk);
1da177e4
LT		 3794 return 0;
3795}
3796
3797static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
3798{
3799 struct l2cap_hdr *lh = (void *) skb->data;
8e036fc3
AV		 3800 u16 cid, len;
3801 __le16 psm;
1da177e4
LT		 3802
3803 skb_pull(skb, L2CAP_HDR_SIZE);
3804 cid = __le16_to_cpu(lh->cid);
3805 len = __le16_to_cpu(lh->len);
3806
1c2acffb
GP		 3807 if (len != skb->len) {
3808 kfree_skb(skb);
3809 return;
3810 }
3811
1da177e4
LT		 3812 BT_DBG("len %d, cid 0x%4.4x", len, cid);
3813
3814 switch (cid) {
8db4dc46 3815 case L2CAP_CID_SIGNALING:
1da177e4
LT		 3816 l2cap_sig_channel(conn, skb);
3817 break;
3818
8db4dc46 3819 case L2CAP_CID_CONN_LESS:
1b7bf4ed 3820 psm = get_unaligned_le16(skb->data);
1da177e4
LT		 3821 skb_pull(skb, 2);
3822 l2cap_conless_channel(conn, psm, skb);
3823 break;
3824
3825 default:
3826 l2cap_data_channel(conn, cid, skb);
3827 break;
3828 }
3829}
3830
3831/* ---- L2CAP interface with lower layer (HCI) ---- */
3832
3833static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
3834{
3835 int exact = 0, lm1 = 0, lm2 = 0;
3836 register struct sock *sk;
3837 struct hlist_node *node;
3838
3839 if (type != ACL_LINK)
3840 return 0;
3841
3842 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
3843
3844 /* Find listening sockets and check their link_mode */
3845 read_lock(&l2cap_sk_list.lock);
3846 sk_for_each(sk, node, &l2cap_sk_list.head) {
3847 if (sk->sk_state != BT_LISTEN)
3848 continue;
3849
3850 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
2af6b9d5
MH		 3851 lm1 |= HCI_LM_ACCEPT;
3852 if (l2cap_pi(sk)->role_switch)
3853 lm1 |= HCI_LM_MASTER;
1da177e4 3854 exact++;
2af6b9d5
MH		 3855 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
3856 lm2 |= HCI_LM_ACCEPT;
3857 if (l2cap_pi(sk)->role_switch)
3858 lm2 |= HCI_LM_MASTER;
3859 }
1da177e4
LT		 3860 }
3861 read_unlock(&l2cap_sk_list.lock);
3862
3863 return exact ? lm1 : lm2;
3864}
3865
3866static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
3867{
0139418c
MH		 3868 struct l2cap_conn *conn;
3869
1da177e4
LT		 3870 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
3871
3872 if (hcon->type != ACL_LINK)
3873 return 0;
3874
3875 if (!status) {
1da177e4
LT		 3876 conn = l2cap_conn_add(hcon, status);
3877 if (conn)
3878 l2cap_conn_ready(conn);
0139418c 3879 } else
1da177e4
LT		 3880 l2cap_conn_del(hcon, bt_err(status));
3881
3882 return 0;
3883}
3884
2950f21a
MH		 3885static int l2cap_disconn_ind(struct hci_conn *hcon)
3886{
3887 struct l2cap_conn *conn = hcon->l2cap_data;
3888
3889 BT_DBG("hcon %p", hcon);
3890
3891 if (hcon->type != ACL_LINK || !conn)
3892 return 0x13;
3893
3894 return conn->disc_reason;
3895}
3896
3897static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
1da177e4
LT		 3898{
3899 BT_DBG("hcon %p reason %d", hcon, reason);
3900
3901 if (hcon->type != ACL_LINK)
3902 return 0;
3903
3904 l2cap_conn_del(hcon, bt_err(reason));
0139418c 3905
1da177e4
LT		 3906 return 0;
3907}
3908
f62e4323
MH		 3909static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt)
3910{
255c7601
MH		 3911 if (sk->sk_type != SOCK_SEQPACKET)
3912 return;
3913
f62e4323
MH		 3914 if (encrypt == 0x00) {
3915 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) {
3916 l2cap_sock_clear_timer(sk);
3917 l2cap_sock_set_timer(sk, HZ * 5);
3918 } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH)
3919 __l2cap_sock_close(sk, ECONNREFUSED);
3920 } else {
3921 if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM)
3922 l2cap_sock_clear_timer(sk);
3923 }
3924}
3925
8c1b2355 3926static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
1da177e4
LT		 3927{
3928 struct l2cap_chan_list *l;
0139418c 3929 struct l2cap_conn *conn = hcon->l2cap_data;
1da177e4 3930 struct sock *sk;
1da177e4 3931
0139418c 3932 if (!conn)
1da177e4 3933 return 0;
0139418c 3934
1da177e4
LT		 3935 l = &conn->chan_list;
3936
3937 BT_DBG("conn %p", conn);
3938
3939 read_lock(&l->lock);
3940
3941 for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) {
3942 bh_lock_sock(sk);
3943
6a8d3010
MH		 3944 if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) {
3945 bh_unlock_sock(sk);
3946 continue;
3947 }
3948
f62e4323 3949 if (!status && (sk->sk_state == BT_CONNECTED ||
8c1b2355 3950 sk->sk_state == BT_CONFIG)) {
f62e4323 3951 l2cap_check_encryption(sk, encrypt);
9719f8af
MH		 3952 bh_unlock_sock(sk);
3953 continue;
3954 }
3955
b1235d79
MH		 3956 if (sk->sk_state == BT_CONNECT) {
3957 if (!status) {
3958 struct l2cap_conn_req req;
3959 req.scid = cpu_to_le16(l2cap_pi(sk)->scid);
3960 req.psm = l2cap_pi(sk)->psm;
1da177e4 3961
b1235d79 3962 l2cap_pi(sk)->ident = l2cap_get_ident(conn);
1da177e4 3963
b1235d79
MH		 3964 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
3965 L2CAP_CONN_REQ, sizeof(req), &req);
3966 } else {
3967 l2cap_sock_clear_timer(sk);
3968 l2cap_sock_set_timer(sk, HZ / 10);
3969 }
3970 } else if (sk->sk_state == BT_CONNECT2) {
3971 struct l2cap_conn_rsp rsp;
3972 __u16 result;
1da177e4 3973
b1235d79
MH		 3974 if (!status) {
3975 sk->sk_state = BT_CONFIG;
3976 result = L2CAP_CR_SUCCESS;
3977 } else {
3978 sk->sk_state = BT_DISCONN;
3979 l2cap_sock_set_timer(sk, HZ / 10);
3980 result = L2CAP_CR_SEC_BLOCK;
3981 }
3982
3983 rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid);
3984 rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid);
3985 rsp.result = cpu_to_le16(result);
e7c29cb1 3986 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
b1235d79
MH		 3987 l2cap_send_cmd(conn, l2cap_pi(sk)->ident,
3988 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
3989 }
1da177e4
LT		 3990
3991 bh_unlock_sock(sk);
3992 }
3993
3994 read_unlock(&l->lock);
b1235d79 3995
1da177e4
LT		 3996 return 0;
3997}
3998
3999static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4000{
4001 struct l2cap_conn *conn = hcon->l2cap_data;
4002
4003 if (!conn && !(conn = l2cap_conn_add(hcon, 0)))
4004 goto drop;
4005
4006 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4007
4008 if (flags & ACL_START) {
4009 struct l2cap_hdr *hdr;
4010 int len;
4011
4012 if (conn->rx_len) {
4013 BT_ERR("Unexpected start frame (len %d)", skb->len);
4014 kfree_skb(conn->rx_skb);
4015 conn->rx_skb = NULL;
4016 conn->rx_len = 0;
4017 l2cap_conn_unreliable(conn, ECOMM);
4018 }
4019
4020 if (skb->len < 2) {
4021 BT_ERR("Frame is too short (len %d)", skb->len);
4022 l2cap_conn_unreliable(conn, ECOMM);
4023 goto drop;
4024 }
4025
4026 hdr = (struct l2cap_hdr *) skb->data;
4027 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4028
4029 if (len == skb->len) {
4030 /* Complete frame received */
4031 l2cap_recv_frame(conn, skb);
4032 return 0;
4033 }
4034
4035 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4036
4037 if (skb->len > len) {
4038 BT_ERR("Frame is too long (len %d, expected len %d)",
4039 skb->len, len);
4040 l2cap_conn_unreliable(conn, ECOMM);
4041 goto drop;
4042 }
4043
4044 /* Allocate skb for the complete frame (with header) */
af05b30b
GP		 4045 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4046 if (!conn->rx_skb)
1da177e4
LT		 4047 goto drop;
4048
d626f62b 4049 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4050 skb->len);
1da177e4
LT		 4051 conn->rx_len = len - skb->len;
4052 } else {
4053 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4054
4055 if (!conn->rx_len) {
4056 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4057 l2cap_conn_unreliable(conn, ECOMM);
4058 goto drop;
4059 }
4060
4061 if (skb->len > conn->rx_len) {
4062 BT_ERR("Fragment is too long (len %d, expected %d)",
4063 skb->len, conn->rx_len);
4064 kfree_skb(conn->rx_skb);
4065 conn->rx_skb = NULL;
4066 conn->rx_len = 0;
4067 l2cap_conn_unreliable(conn, ECOMM);
4068 goto drop;
4069 }
4070
d626f62b 4071 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
e1027a7c 4072 skb->len);
1da177e4
LT		 4073 conn->rx_len -= skb->len;
4074
4075 if (!conn->rx_len) {
4076 /* Complete frame received */
4077 l2cap_recv_frame(conn, conn->rx_skb);
4078 conn->rx_skb = NULL;
4079 }
4080 }
4081
4082drop:
4083 kfree_skb(skb);
4084 return 0;
4085}
4086
aef7d97c 4087static int l2cap_debugfs_show(struct seq_file *f, void *p)
1da177e4
LT		 4088{
4089 struct sock *sk;
4090 struct hlist_node *node;
1da177e4
LT		 4091
4092 read_lock_bh(&l2cap_sk_list.lock);
4093
be9d1227
MH		 4094 sk_for_each(sk, node, &l2cap_sk_list.head) {
4095 struct l2cap_pinfo *pi = l2cap_pi(sk);
101545f6 4096
aef7d97c
MH		 4097 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
4098 batostr(&bt_sk(sk)->src),
4099 batostr(&bt_sk(sk)->dst),
4100 sk->sk_state, __le16_to_cpu(pi->psm),
4101 pi->scid, pi->dcid,
4102 pi->imtu, pi->omtu, pi->sec_level);
be9d1227 4103 }
1da177e4 4104
1da177e4 4105 read_unlock_bh(&l2cap_sk_list.lock);
1da177e4 4106
aef7d97c 4107 return 0;
1da177e4
LT		 4108}
4109
aef7d97c
MH		 4110static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4111{
4112 return single_open(file, l2cap_debugfs_show, inode->i_private);
4113}
4114
4115static const struct file_operations l2cap_debugfs_fops = {
4116 .open = l2cap_debugfs_open,
4117 .read = seq_read,
4118 .llseek = seq_lseek,
4119 .release = single_release,
4120};
4121
4122static struct dentry *l2cap_debugfs;
1da177e4 4123
90ddc4f0 4124static const struct proto_ops l2cap_sock_ops = {
1da177e4
LT		 4125 .family = PF_BLUETOOTH,
4126 .owner = THIS_MODULE,
4127 .release = l2cap_sock_release,
4128 .bind = l2cap_sock_bind,
4129 .connect = l2cap_sock_connect,
4130 .listen = l2cap_sock_listen,
4131 .accept = l2cap_sock_accept,
4132 .getname = l2cap_sock_getname,
4133 .sendmsg = l2cap_sock_sendmsg,
f66dc81f 4134 .recvmsg = l2cap_sock_recvmsg,
1da177e4 4135 .poll = bt_sock_poll,
3241ad82 4136 .ioctl = bt_sock_ioctl,
1da177e4
LT		 4137 .mmap = sock_no_mmap,
4138 .socketpair = sock_no_socketpair,
1da177e4
LT		 4139 .shutdown = l2cap_sock_shutdown,
4140 .setsockopt = l2cap_sock_setsockopt,
4141 .getsockopt = l2cap_sock_getsockopt
4142};
4143
ec1b4cf7 4144static const struct net_proto_family l2cap_sock_family_ops = {
1da177e4
LT		 4145 .family = PF_BLUETOOTH,
4146 .owner = THIS_MODULE,
4147 .create = l2cap_sock_create,
4148};
4149
4150static struct hci_proto l2cap_hci_proto = {
4151 .name = "L2CAP",
4152 .id = HCI_PROTO_L2CAP,
4153 .connect_ind = l2cap_connect_ind,
4154 .connect_cfm = l2cap_connect_cfm,
4155 .disconn_ind = l2cap_disconn_ind,
2950f21a 4156 .disconn_cfm = l2cap_disconn_cfm,
8c1b2355 4157 .security_cfm = l2cap_security_cfm,
1da177e4
LT		 4158 .recv_acldata = l2cap_recv_acldata
4159};
4160
4161static int __init l2cap_init(void)
4162{
4163 int err;
be9d1227 4164
1da177e4
LT		 4165 err = proto_register(&l2cap_proto, 0);
4166 if (err < 0)
4167 return err;
4168
4169 err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
4170 if (err < 0) {
4171 BT_ERR("L2CAP socket registration failed");
4172 goto error;
4173 }
4174
4175 err = hci_register_proto(&l2cap_hci_proto);
4176 if (err < 0) {
4177 BT_ERR("L2CAP protocol registration failed");
4178 bt_sock_unregister(BTPROTO_L2CAP);
4179 goto error;
4180 }
4181
aef7d97c
MH		 4182 if (bt_debugfs) {
4183 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4184 bt_debugfs, NULL, &l2cap_debugfs_fops);
4185 if (!l2cap_debugfs)
4186 BT_ERR("Failed to create L2CAP debug file");
4187 }
1da177e4
LT		 4188
4189 BT_INFO("L2CAP ver %s", VERSION);
4190 BT_INFO("L2CAP socket layer initialized");
4191
4192 return 0;
4193
4194error:
4195 proto_unregister(&l2cap_proto);
4196 return err;
4197}
4198
4199static void __exit l2cap_exit(void)
4200{
aef7d97c 4201 debugfs_remove(l2cap_debugfs);
1da177e4
LT		 4202
4203 if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
4204 BT_ERR("L2CAP socket unregistration failed");
4205
4206 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4207 BT_ERR("L2CAP protocol unregistration failed");
4208
4209 proto_unregister(&l2cap_proto);
4210}
4211
4212void l2cap_load(void)
4213{
4214 /* Dummy function to trigger automatic L2CAP module loading by
4215 * other modules that use L2CAP sockets but don't use any other
4216 * symbols from it. */
4217 return;
4218}
4219EXPORT_SYMBOL(l2cap_load);
4220
4221module_init(l2cap_init);
4222module_exit(l2cap_exit);
4223
44dd46de
MH		 4224module_param(enable_ertm, bool, 0644);
4225MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode");
4226
5fbcd3d1
MH		 4227module_param(max_transmit, uint, 0644);
4228MODULE_PARM_DESC(max_transmit, "Max transmit value (default = 3)");
4229
63fbd24e 4230MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4
LT		 4231MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION);
4232MODULE_VERSION(VERSION);
4233MODULE_LICENSE("GPL");
4234MODULE_ALIAS("bt-proto-0");
kernel source for telekom puls (alcatel/mediatek)