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ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / net / bluetooth / l2cap_core.c
blob7705e26e699f158f028c773a53d61ee5b08dba84
1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4 Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org>
5 Copyright (C) 2010 Google Inc.
6
7 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License version 2 as
11 published by the Free Software Foundation;
12
13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
14 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
16 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
17 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
18 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
19 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
20 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21
22 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
23 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
24 SOFTWARE IS DISCLAIMED.
25 */
26
27 /* Bluetooth L2CAP core. */
28
29 #include <linux/module.h>
30
31 #include <linux/types.h>
32 #include <linux/capability.h>
33 #include <linux/errno.h>
34 #include <linux/kernel.h>
35 #include <linux/sched.h>
36 #include <linux/slab.h>
37 #include <linux/poll.h>
38 #include <linux/fcntl.h>
39 #include <linux/init.h>
40 #include <linux/interrupt.h>
41 #include <linux/socket.h>
42 #include <linux/skbuff.h>
43 #include <linux/list.h>
44 #include <linux/device.h>
45 #include <linux/debugfs.h>
46 #include <linux/seq_file.h>
47 #include <linux/uaccess.h>
48 #include <linux/crc16.h>
49 #include <net/sock.h>
50
51 #include <asm/system.h>
52 #include <asm/unaligned.h>
53
54 #include <net/bluetooth/bluetooth.h>
55 #include <net/bluetooth/hci_core.h>
56 #include <net/bluetooth/l2cap.h>
57
58 int disable_ertm;
59
60 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
61 static u8 l2cap_fixed_chan[8] = { 0x02, };
62
63 static struct workqueue_struct *_busy_wq;
64
65 LIST_HEAD(chan_list);
66 DEFINE_RWLOCK(chan_list_lock);
67
68 static void l2cap_busy_work(struct work_struct *work);
69
70 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
71 u8 code, u8 ident, u16 dlen, void *data);
72 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
73
74 static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);
75
76 /* ---- L2CAP channels ---- */
77 static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
78 {
79 struct l2cap_chan *c;
80
81 list_for_each_entry(c, &conn->chan_l, list) {
82 if (c->dcid == cid)
83 return c;
84 }
85 return NULL;
86
87 }
88
89 static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
90 {
91 struct l2cap_chan *c;
92
93 list_for_each_entry(c, &conn->chan_l, list) {
94 if (c->scid == cid)
95 return c;
96 }
97 return NULL;
98 }
99
100 /* Find channel with given SCID.
101 * Returns locked socket */
102 static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
103 {
104 struct l2cap_chan *c;
105
106 read_lock(&conn->chan_lock);
107 c = __l2cap_get_chan_by_scid(conn, cid);
108 if (c)
109 bh_lock_sock(c->sk);
110 read_unlock(&conn->chan_lock);
111 return c;
112 }
113
114 static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
115 {
116 struct l2cap_chan *c;
117
118 list_for_each_entry(c, &conn->chan_l, list) {
119 if (c->ident == ident)
120 return c;
121 }
122 return NULL;
123 }
124
125 static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
126 {
127 struct l2cap_chan *c;
128
129 read_lock(&conn->chan_lock);
130 c = __l2cap_get_chan_by_ident(conn, ident);
131 if (c)
132 bh_lock_sock(c->sk);
133 read_unlock(&conn->chan_lock);
134 return c;
135 }
136
137 static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
138 {
139 struct l2cap_chan *c;
140
141 list_for_each_entry(c, &chan_list, global_l) {
142 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
143 goto found;
144 }
145
146 c = NULL;
147 found:
148 return c;
149 }
150
151 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
152 {
153 int err;
154
155 write_lock_bh(&chan_list_lock);
156
157 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
158 err = -EADDRINUSE;
159 goto done;
160 }
161
162 if (psm) {
163 chan->psm = psm;
164 chan->sport = psm;
165 err = 0;
166 } else {
167 u16 p;
168
169 err = -EINVAL;
170 for (p = 0x1001; p < 0x1100; p += 2)
171 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
172 chan->psm = cpu_to_le16(p);
173 chan->sport = cpu_to_le16(p);
174 err = 0;
175 break;
176 }
177 }
178
179 done:
180 write_unlock_bh(&chan_list_lock);
181 return err;
182 }
183
184 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
185 {
186 write_lock_bh(&chan_list_lock);
187
188 chan->scid = scid;
189
190 write_unlock_bh(&chan_list_lock);
191
192 return 0;
193 }
194
195 static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
196 {
197 u16 cid = L2CAP_CID_DYN_START;
198
199 for (; cid < L2CAP_CID_DYN_END; cid++) {
200 if (!__l2cap_get_chan_by_scid(conn, cid))
201 return cid;
202 }
203
204 return 0;
205 }
206
207 struct l2cap_chan *l2cap_chan_create(struct sock *sk)
208 {
209 struct l2cap_chan *chan;
210
211 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
212 if (!chan)
213 return NULL;
214
215 chan->sk = sk;
216
217 write_lock_bh(&chan_list_lock);
218 list_add(&chan->global_l, &chan_list);
219 write_unlock_bh(&chan_list_lock);
220
221 return chan;
222 }
223
224 void l2cap_chan_destroy(struct l2cap_chan *chan)
225 {
226 write_lock_bh(&chan_list_lock);
227 list_del(&chan->global_l);
228 write_unlock_bh(&chan_list_lock);
229
230 kfree(chan);
231 }
232
233 static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
234 {
235 struct sock *sk = chan->sk;
236
237 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
238 chan->psm, chan->dcid);
239
240 conn->disc_reason = 0x13;
241
242 chan->conn = conn;
243
244 if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) {
245 if (conn->hcon->type == LE_LINK) {
246 /* LE connection */
247 chan->omtu = L2CAP_LE_DEFAULT_MTU;
248 chan->scid = L2CAP_CID_LE_DATA;
249 chan->dcid = L2CAP_CID_LE_DATA;
250 } else {
251 /* Alloc CID for connection-oriented socket */
252 chan->scid = l2cap_alloc_cid(conn);
253 chan->omtu = L2CAP_DEFAULT_MTU;
254 }
255 } else if (sk->sk_type == SOCK_DGRAM) {
256 /* Connectionless socket */
257 chan->scid = L2CAP_CID_CONN_LESS;
258 chan->dcid = L2CAP_CID_CONN_LESS;
259 chan->omtu = L2CAP_DEFAULT_MTU;
260 } else {
261 /* Raw socket can send/recv signalling messages only */
262 chan->scid = L2CAP_CID_SIGNALING;
263 chan->dcid = L2CAP_CID_SIGNALING;
264 chan->omtu = L2CAP_DEFAULT_MTU;
265 }
266
267 sock_hold(sk);
268
269 list_add(&chan->list, &conn->chan_l);
270 }
271
272 /* Delete channel.
273 * Must be called on the locked socket. */
274 void l2cap_chan_del(struct l2cap_chan *chan, int err)
275 {
276 struct sock *sk = chan->sk;
277 struct l2cap_conn *conn = chan->conn;
278 struct sock *parent = bt_sk(sk)->parent;
279
280 l2cap_sock_clear_timer(sk);
281
282 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
283
284 if (conn) {
285 /* Delete from channel list */
286 write_lock_bh(&conn->chan_lock);
287 list_del(&chan->list);
288 write_unlock_bh(&conn->chan_lock);
289 __sock_put(sk);
290
291 chan->conn = NULL;
292 hci_conn_put(conn->hcon);
293 }
294
295 sk->sk_state = BT_CLOSED;
296 sock_set_flag(sk, SOCK_ZAPPED);
297
298 if (err)
299 sk->sk_err = err;
300
301 if (parent) {
302 bt_accept_unlink(sk);
303 parent->sk_data_ready(parent, 0);
304 } else
305 sk->sk_state_change(sk);
306
307 if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE &&
308 chan->conf_state & L2CAP_CONF_INPUT_DONE))
309 return;
310
311 skb_queue_purge(&chan->tx_q);
312
313 if (chan->mode == L2CAP_MODE_ERTM) {
314 struct srej_list *l, *tmp;
315
316 del_timer(&chan->retrans_timer);
317 del_timer(&chan->monitor_timer);
318 del_timer(&chan->ack_timer);
319
320 skb_queue_purge(&chan->srej_q);
321 skb_queue_purge(&chan->busy_q);
322
323 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
324 list_del(&l->list);
325 kfree(l);
326 }
327 }
328 }
329
330 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
331 {
332 struct sock *sk = chan->sk;
333
334 if (sk->sk_type == SOCK_RAW) {
335 switch (chan->sec_level) {
336 case BT_SECURITY_HIGH:
337 return HCI_AT_DEDICATED_BONDING_MITM;
338 case BT_SECURITY_MEDIUM:
339 return HCI_AT_DEDICATED_BONDING;
340 default:
341 return HCI_AT_NO_BONDING;
342 }
343 } else if (chan->psm == cpu_to_le16(0x0001)) {
344 if (chan->sec_level == BT_SECURITY_LOW)
345 chan->sec_level = BT_SECURITY_SDP;
346
347 if (chan->sec_level == BT_SECURITY_HIGH)
348 return HCI_AT_NO_BONDING_MITM;
349 else
350 return HCI_AT_NO_BONDING;
351 } else {
352 switch (chan->sec_level) {
353 case BT_SECURITY_HIGH:
354 return HCI_AT_GENERAL_BONDING_MITM;
355 case BT_SECURITY_MEDIUM:
356 return HCI_AT_GENERAL_BONDING;
357 default:
358 return HCI_AT_NO_BONDING;
359 }
360 }
361 }
362
363 /* Service level security */
364 static inline int l2cap_check_security(struct l2cap_chan *chan)
365 {
366 struct l2cap_conn *conn = chan->conn;
367 __u8 auth_type;
368
369 auth_type = l2cap_get_auth_type(chan);
370
371 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
372 }
373
374 u8 l2cap_get_ident(struct l2cap_conn *conn)
375 {
376 u8 id;
377
378 /* Get next available identificator.
379 * 1 - 128 are used by kernel.
380 * 129 - 199 are reserved.
381 * 200 - 254 are used by utilities like l2ping, etc.
382 */
383
384 spin_lock_bh(&conn->lock);
385
386 if (++conn->tx_ident > 128)
387 conn->tx_ident = 1;
388
389 id = conn->tx_ident;
390
391 spin_unlock_bh(&conn->lock);
392
393 return id;
394 }
395
396 void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data)
397 {
398 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
399 u8 flags;
400
401 BT_DBG("code 0x%2.2x", code);
402
403 if (!skb)
404 return;
405
406 if (lmp_no_flush_capable(conn->hcon->hdev))
407 flags = ACL_START_NO_FLUSH;
408 else
409 flags = ACL_START;
410
411 hci_send_acl(conn->hcon, skb, flags);
412 }
413
414 static inline void l2cap_send_sframe(struct l2cap_chan *chan, u16 control)
415 {
416 struct sk_buff *skb;
417 struct l2cap_hdr *lh;
418 struct l2cap_pinfo *pi = l2cap_pi(chan->sk);
419 struct l2cap_conn *conn = chan->conn;
420 struct sock *sk = (struct sock *)pi;
421 int count, hlen = L2CAP_HDR_SIZE + 2;
422 u8 flags;
423
424 if (sk->sk_state != BT_CONNECTED)
425 return;
426
427 if (chan->fcs == L2CAP_FCS_CRC16)
428 hlen += 2;
429
430 BT_DBG("chan %p, control 0x%2.2x", chan, control);
431
432 count = min_t(unsigned int, conn->mtu, hlen);
433 control |= L2CAP_CTRL_FRAME_TYPE;
434
435 if (chan->conn_state & L2CAP_CONN_SEND_FBIT) {
436 control |= L2CAP_CTRL_FINAL;
437 chan->conn_state &= ~L2CAP_CONN_SEND_FBIT;
438 }
439
440 if (chan->conn_state & L2CAP_CONN_SEND_PBIT) {
441 control |= L2CAP_CTRL_POLL;
442 chan->conn_state &= ~L2CAP_CONN_SEND_PBIT;
443 }
444
445 skb = bt_skb_alloc(count, GFP_ATOMIC);
446 if (!skb)
447 return;
448
449 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
450 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
451 lh->cid = cpu_to_le16(chan->dcid);
452 put_unaligned_le16(control, skb_put(skb, 2));
453
454 if (chan->fcs == L2CAP_FCS_CRC16) {
455 u16 fcs = crc16(0, (u8 *)lh, count - 2);
456 put_unaligned_le16(fcs, skb_put(skb, 2));
457 }
458
459 if (lmp_no_flush_capable(conn->hcon->hdev))
460 flags = ACL_START_NO_FLUSH;
461 else
462 flags = ACL_START;
463
464 hci_send_acl(chan->conn->hcon, skb, flags);
465 }
466
467 static inline void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, u16 control)
468 {
469 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
470 control |= L2CAP_SUPER_RCV_NOT_READY;
471 chan->conn_state |= L2CAP_CONN_RNR_SENT;
472 } else
473 control |= L2CAP_SUPER_RCV_READY;
474
475 control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
476
477 l2cap_send_sframe(chan, control);
478 }
479
480 static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
481 {
482 return !(chan->conf_state & L2CAP_CONF_CONNECT_PEND);
483 }
484
485 static void l2cap_do_start(struct l2cap_chan *chan)
486 {
487 struct l2cap_conn *conn = chan->conn;
488
489 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
490 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
491 return;
492
493 if (l2cap_check_security(chan) &&
494 __l2cap_no_conn_pending(chan)) {
495 struct l2cap_conn_req req;
496 req.scid = cpu_to_le16(chan->scid);
497 req.psm = chan->psm;
498
499 chan->ident = l2cap_get_ident(conn);
500 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
501
502 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
503 sizeof(req), &req);
504 }
505 } else {
506 struct l2cap_info_req req;
507 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
508
509 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
510 conn->info_ident = l2cap_get_ident(conn);
511
512 mod_timer(&conn->info_timer, jiffies +
513 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
514
515 l2cap_send_cmd(conn, conn->info_ident,
516 L2CAP_INFO_REQ, sizeof(req), &req);
517 }
518 }
519
520 static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
521 {
522 u32 local_feat_mask = l2cap_feat_mask;
523 if (!disable_ertm)
524 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
525
526 switch (mode) {
527 case L2CAP_MODE_ERTM:
528 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
529 case L2CAP_MODE_STREAMING:
530 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
531 default:
532 return 0x00;
533 }
534 }
535
536 void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *chan, int err)
537 {
538 struct sock *sk;
539 struct l2cap_disconn_req req;
540
541 if (!conn)
542 return;
543
544 sk = chan->sk;
545
546 if (chan->mode == L2CAP_MODE_ERTM) {
547 del_timer(&chan->retrans_timer);
548 del_timer(&chan->monitor_timer);
549 del_timer(&chan->ack_timer);
550 }
551
552 req.dcid = cpu_to_le16(chan->dcid);
553 req.scid = cpu_to_le16(chan->scid);
554 l2cap_send_cmd(conn, l2cap_get_ident(conn),
555 L2CAP_DISCONN_REQ, sizeof(req), &req);
556
557 sk->sk_state = BT_DISCONN;
558 sk->sk_err = err;
559 }
560
561 /* ---- L2CAP connections ---- */
562 static void l2cap_conn_start(struct l2cap_conn *conn)
563 {
564 struct l2cap_chan *chan, *tmp;
565
566 BT_DBG("conn %p", conn);
567
568 read_lock(&conn->chan_lock);
569
570 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
571 struct sock *sk = chan->sk;
572
573 bh_lock_sock(sk);
574
575 if (sk->sk_type != SOCK_SEQPACKET &&
576 sk->sk_type != SOCK_STREAM) {
577 bh_unlock_sock(sk);
578 continue;
579 }
580
581 if (sk->sk_state == BT_CONNECT) {
582 struct l2cap_conn_req req;
583
584 if (!l2cap_check_security(chan) ||
585 !__l2cap_no_conn_pending(chan)) {
586 bh_unlock_sock(sk);
587 continue;
588 }
589
590 if (!l2cap_mode_supported(chan->mode,
591 conn->feat_mask)
592 && chan->conf_state &
593 L2CAP_CONF_STATE2_DEVICE) {
594 /* __l2cap_sock_close() calls list_del(chan)
595 * so release the lock */
596 read_unlock_bh(&conn->chan_lock);
597 __l2cap_sock_close(sk, ECONNRESET);
598 read_lock_bh(&conn->chan_lock);
599 bh_unlock_sock(sk);
600 continue;
601 }
602
603 req.scid = cpu_to_le16(chan->scid);
604 req.psm = chan->psm;
605
606 chan->ident = l2cap_get_ident(conn);
607 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
608
609 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ,
610 sizeof(req), &req);
611
612 } else if (sk->sk_state == BT_CONNECT2) {
613 struct l2cap_conn_rsp rsp;
614 char buf[128];
615 rsp.scid = cpu_to_le16(chan->dcid);
616 rsp.dcid = cpu_to_le16(chan->scid);
617
618 if (l2cap_check_security(chan)) {
619 if (bt_sk(sk)->defer_setup) {
620 struct sock *parent = bt_sk(sk)->parent;
621 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
622 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
623 if (parent)
624 parent->sk_data_ready(parent, 0);
625
626 } else {
627 sk->sk_state = BT_CONFIG;
628 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
629 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
630 }
631 } else {
632 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
633 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
634 }
635
636 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
637 sizeof(rsp), &rsp);
638
639 if (chan->conf_state & L2CAP_CONF_REQ_SENT ||
640 rsp.result != L2CAP_CR_SUCCESS) {
641 bh_unlock_sock(sk);
642 continue;
643 }
644
645 chan->conf_state |= L2CAP_CONF_REQ_SENT;
646 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
647 l2cap_build_conf_req(chan, buf), buf);
648 chan->num_conf_req++;
649 }
650
651 bh_unlock_sock(sk);
652 }
653
654 read_unlock(&conn->chan_lock);
655 }
656
657 /* Find socket with cid and source bdaddr.
658 * Returns closest match, locked.
659 */
660 static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src)
661 {
662 struct l2cap_chan *c, *c1 = NULL;
663
664 read_lock(&chan_list_lock);
665
666 list_for_each_entry(c, &chan_list, global_l) {
667 struct sock *sk = c->sk;
668
669 if (state && sk->sk_state != state)
670 continue;
671
672 if (c->scid == cid) {
673 /* Exact match. */
674 if (!bacmp(&bt_sk(sk)->src, src)) {
675 read_unlock(&chan_list_lock);
676 return c;
677 }
678
679 /* Closest match */
680 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
681 c1 = c;
682 }
683 }
684
685 read_unlock(&chan_list_lock);
686
687 return c1;
688 }
689
690 static void l2cap_le_conn_ready(struct l2cap_conn *conn)
691 {
692 struct sock *parent, *sk;
693 struct l2cap_chan *chan, *pchan;
694
695 BT_DBG("");
696
697 /* Check if we have socket listening on cid */
698 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
699 conn->src);
700 if (!pchan)
701 return;
702
703 parent = pchan->sk;
704
705 bh_lock_sock(parent);
706
707 /* Check for backlog size */
708 if (sk_acceptq_is_full(parent)) {
709 BT_DBG("backlog full %d", parent->sk_ack_backlog);
710 goto clean;
711 }
712
713 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
714 if (!sk)
715 goto clean;
716
717 chan = l2cap_chan_create(sk);
718 if (!chan) {
719 l2cap_sock_kill(sk);
720 goto clean;
721 }
722
723 l2cap_pi(sk)->chan = chan;
724
725 write_lock_bh(&conn->chan_lock);
726
727 hci_conn_hold(conn->hcon);
728
729 l2cap_sock_init(sk, parent);
730
731 bacpy(&bt_sk(sk)->src, conn->src);
732 bacpy(&bt_sk(sk)->dst, conn->dst);
733
734 bt_accept_enqueue(parent, sk);
735
736 __l2cap_chan_add(conn, chan);
737
738 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
739
740 sk->sk_state = BT_CONNECTED;
741 parent->sk_data_ready(parent, 0);
742
743 write_unlock_bh(&conn->chan_lock);
744
745 clean:
746 bh_unlock_sock(parent);
747 }
748
749 static void l2cap_conn_ready(struct l2cap_conn *conn)
750 {
751 struct l2cap_chan *chan;
752
753 BT_DBG("conn %p", conn);
754
755 if (!conn->hcon->out && conn->hcon->type == LE_LINK)
756 l2cap_le_conn_ready(conn);
757
758 read_lock(&conn->chan_lock);
759
760 list_for_each_entry(chan, &conn->chan_l, list) {
761 struct sock *sk = chan->sk;
762
763 bh_lock_sock(sk);
764
765 if (conn->hcon->type == LE_LINK) {
766 l2cap_sock_clear_timer(sk);
767 sk->sk_state = BT_CONNECTED;
768 sk->sk_state_change(sk);
769 }
770
771 if (sk->sk_type != SOCK_SEQPACKET &&
772 sk->sk_type != SOCK_STREAM) {
773 l2cap_sock_clear_timer(sk);
774 sk->sk_state = BT_CONNECTED;
775 sk->sk_state_change(sk);
776 } else if (sk->sk_state == BT_CONNECT)
777 l2cap_do_start(chan);
778
779 bh_unlock_sock(sk);
780 }
781
782 read_unlock(&conn->chan_lock);
783 }
784
785 /* Notify sockets that we cannot guaranty reliability anymore */
786 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
787 {
788 struct l2cap_chan *chan;
789
790 BT_DBG("conn %p", conn);
791
792 read_lock(&conn->chan_lock);
793
794 list_for_each_entry(chan, &conn->chan_l, list) {
795 struct sock *sk = chan->sk;
796
797 if (chan->force_reliable)
798 sk->sk_err = err;
799 }
800
801 read_unlock(&conn->chan_lock);
802 }
803
804 static void l2cap_info_timeout(unsigned long arg)
805 {
806 struct l2cap_conn *conn = (void *) arg;
807
808 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
809 conn->info_ident = 0;
810
811 l2cap_conn_start(conn);
812 }
813
814 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
815 {
816 struct l2cap_conn *conn = hcon->l2cap_data;
817
818 if (conn || status)
819 return conn;
820
821 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
822 if (!conn)
823 return NULL;
824
825 hcon->l2cap_data = conn;
826 conn->hcon = hcon;
827
828 BT_DBG("hcon %p conn %p", hcon, conn);
829
830 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
831 conn->mtu = hcon->hdev->le_mtu;
832 else
833 conn->mtu = hcon->hdev->acl_mtu;
834
835 conn->src = &hcon->hdev->bdaddr;
836 conn->dst = &hcon->dst;
837
838 conn->feat_mask = 0;
839
840 spin_lock_init(&conn->lock);
841 rwlock_init(&conn->chan_lock);
842
843 INIT_LIST_HEAD(&conn->chan_l);
844
845 if (hcon->type != LE_LINK)
846 setup_timer(&conn->info_timer, l2cap_info_timeout,
847 (unsigned long) conn);
848
849 conn->disc_reason = 0x13;
850
851 return conn;
852 }
853
854 static void l2cap_conn_del(struct hci_conn *hcon, int err)
855 {
856 struct l2cap_conn *conn = hcon->l2cap_data;
857 struct l2cap_chan *chan, *l;
858 struct sock *sk;
859
860 if (!conn)
861 return;
862
863 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
864
865 kfree_skb(conn->rx_skb);
866
867 /* Kill channels */
868 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
869 sk = chan->sk;
870 bh_lock_sock(sk);
871 l2cap_chan_del(chan, err);
872 bh_unlock_sock(sk);
873 l2cap_sock_kill(sk);
874 }
875
876 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
877 del_timer_sync(&conn->info_timer);
878
879 hcon->l2cap_data = NULL;
880 kfree(conn);
881 }
882
883 static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
884 {
885 write_lock_bh(&conn->chan_lock);
886 __l2cap_chan_add(conn, chan);
887 write_unlock_bh(&conn->chan_lock);
888 }
889
890 /* ---- Socket interface ---- */
891
892 /* Find socket with psm and source bdaddr.
893 * Returns closest match.
894 */
895 static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src)
896 {
897 struct l2cap_chan *c, *c1 = NULL;
898
899 read_lock(&chan_list_lock);
900
901 list_for_each_entry(c, &chan_list, global_l) {
902 struct sock *sk = c->sk;
903
904 if (state && sk->sk_state != state)
905 continue;
906
907 if (c->psm == psm) {
908 /* Exact match. */
909 if (!bacmp(&bt_sk(sk)->src, src)) {
910 read_unlock(&chan_list_lock);
911 return c;
912 }
913
914 /* Closest match */
915 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
916 c1 = c;
917 }
918 }
919
920 read_unlock(&chan_list_lock);
921
922 return c1;
923 }
924
925 int l2cap_chan_connect(struct l2cap_chan *chan)
926 {
927 struct sock *sk = chan->sk;
928 bdaddr_t *src = &bt_sk(sk)->src;
929 bdaddr_t *dst = &bt_sk(sk)->dst;
930 struct l2cap_conn *conn;
931 struct hci_conn *hcon;
932 struct hci_dev *hdev;
933 __u8 auth_type;
934 int err;
935
936 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
937 chan->psm);
938
939 hdev = hci_get_route(dst, src);
940 if (!hdev)
941 return -EHOSTUNREACH;
942
943 hci_dev_lock_bh(hdev);
944
945 auth_type = l2cap_get_auth_type(chan);
946
947 if (chan->dcid == L2CAP_CID_LE_DATA)
948 hcon = hci_connect(hdev, LE_LINK, dst,
949 chan->sec_level, auth_type);
950 else
951 hcon = hci_connect(hdev, ACL_LINK, dst,
952 chan->sec_level, auth_type);
953
954 if (IS_ERR(hcon)) {
955 err = PTR_ERR(hcon);
956 goto done;
957 }
958
959 conn = l2cap_conn_add(hcon, 0);
960 if (!conn) {
961 hci_conn_put(hcon);
962 err = -ENOMEM;
963 goto done;
964 }
965
966 /* Update source addr of the socket */
967 bacpy(src, conn->src);
968
969 l2cap_chan_add(conn, chan);
970
971 sk->sk_state = BT_CONNECT;
972 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
973
974 if (hcon->state == BT_CONNECTED) {
975 if (sk->sk_type != SOCK_SEQPACKET &&
976 sk->sk_type != SOCK_STREAM) {
977 l2cap_sock_clear_timer(sk);
978 if (l2cap_check_security(chan))
979 sk->sk_state = BT_CONNECTED;
980 } else
981 l2cap_do_start(chan);
982 }
983
984 err = 0;
985
986 done:
987 hci_dev_unlock_bh(hdev);
988 hci_dev_put(hdev);
989 return err;
990 }
991
992 int __l2cap_wait_ack(struct sock *sk)
993 {
994 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
995 DECLARE_WAITQUEUE(wait, current);
996 int err = 0;
997 int timeo = HZ/5;
998
999 add_wait_queue(sk_sleep(sk), &wait);
1000 while ((chan->unacked_frames > 0 && chan->conn)) {
1001 set_current_state(TASK_INTERRUPTIBLE);
1002
1003 if (!timeo)
1004 timeo = HZ/5;
1005
1006 if (signal_pending(current)) {
1007 err = sock_intr_errno(timeo);
1008 break;
1009 }
1010
1011 release_sock(sk);
1012 timeo = schedule_timeout(timeo);
1013 lock_sock(sk);
1014
1015 err = sock_error(sk);
1016 if (err)
1017 break;
1018 }
1019 set_current_state(TASK_RUNNING);
1020 remove_wait_queue(sk_sleep(sk), &wait);
1021 return err;
1022 }
1023
1024 static void l2cap_monitor_timeout(unsigned long arg)
1025 {
1026 struct l2cap_chan *chan = (void *) arg;
1027 struct sock *sk = chan->sk;
1028
1029 BT_DBG("chan %p", chan);
1030
1031 bh_lock_sock(sk);
1032 if (chan->retry_count >= chan->remote_max_tx) {
1033 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1034 bh_unlock_sock(sk);
1035 return;
1036 }
1037
1038 chan->retry_count++;
1039 __mod_monitor_timer();
1040
1041 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
1042 bh_unlock_sock(sk);
1043 }
1044
1045 static void l2cap_retrans_timeout(unsigned long arg)
1046 {
1047 struct l2cap_chan *chan = (void *) arg;
1048 struct sock *sk = chan->sk;
1049
1050 BT_DBG("chan %p", chan);
1051
1052 bh_lock_sock(sk);
1053 chan->retry_count = 1;
1054 __mod_monitor_timer();
1055
1056 chan->conn_state |= L2CAP_CONN_WAIT_F;
1057
1058 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
1059 bh_unlock_sock(sk);
1060 }
1061
1062 static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
1063 {
1064 struct sk_buff *skb;
1065
1066 while ((skb = skb_peek(&chan->tx_q)) &&
1067 chan->unacked_frames) {
1068 if (bt_cb(skb)->tx_seq == chan->expected_ack_seq)
1069 break;
1070
1071 skb = skb_dequeue(&chan->tx_q);
1072 kfree_skb(skb);
1073
1074 chan->unacked_frames--;
1075 }
1076
1077 if (!chan->unacked_frames)
1078 del_timer(&chan->retrans_timer);
1079 }
1080
1081 void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
1082 {
1083 struct hci_conn *hcon = chan->conn->hcon;
1084 u16 flags;
1085
1086 BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len);
1087
1088 if (!chan->flushable && lmp_no_flush_capable(hcon->hdev))
1089 flags = ACL_START_NO_FLUSH;
1090 else
1091 flags = ACL_START;
1092
1093 hci_send_acl(hcon, skb, flags);
1094 }
1095
1096 void l2cap_streaming_send(struct l2cap_chan *chan)
1097 {
1098 struct sk_buff *skb;
1099 u16 control, fcs;
1100
1101 while ((skb = skb_dequeue(&chan->tx_q))) {
1102 control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
1103 control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
1104 put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
1105
1106 if (chan->fcs == L2CAP_FCS_CRC16) {
1107 fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
1108 put_unaligned_le16(fcs, skb->data + skb->len - 2);
1109 }
1110
1111 l2cap_do_send(chan, skb);
1112
1113 chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
1114 }
1115 }
1116
1117 static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq)
1118 {
1119 struct sk_buff *skb, *tx_skb;
1120 u16 control, fcs;
1121
1122 skb = skb_peek(&chan->tx_q);
1123 if (!skb)
1124 return;
1125
1126 do {
1127 if (bt_cb(skb)->tx_seq == tx_seq)
1128 break;
1129
1130 if (skb_queue_is_last(&chan->tx_q, skb))
1131 return;
1132
1133 } while ((skb = skb_queue_next(&chan->tx_q, skb)));
1134
1135 if (chan->remote_max_tx &&
1136 bt_cb(skb)->retries == chan->remote_max_tx) {
1137 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1138 return;
1139 }
1140
1141 tx_skb = skb_clone(skb, GFP_ATOMIC);
1142 bt_cb(skb)->retries++;
1143 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1144 control &= L2CAP_CTRL_SAR;
1145
1146 if (chan->conn_state & L2CAP_CONN_SEND_FBIT) {
1147 control |= L2CAP_CTRL_FINAL;
1148 chan->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1149 }
1150
1151 control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1152 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1153
1154 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1155
1156 if (chan->fcs == L2CAP_FCS_CRC16) {
1157 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1158 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1159 }
1160
1161 l2cap_do_send(chan, tx_skb);
1162 }
1163
1164 int l2cap_ertm_send(struct l2cap_chan *chan)
1165 {
1166 struct sk_buff *skb, *tx_skb;
1167 struct sock *sk = chan->sk;
1168 u16 control, fcs;
1169 int nsent = 0;
1170
1171 if (sk->sk_state != BT_CONNECTED)
1172 return -ENOTCONN;
1173
1174 while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
1175
1176 if (chan->remote_max_tx &&
1177 bt_cb(skb)->retries == chan->remote_max_tx) {
1178 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1179 break;
1180 }
1181
1182 tx_skb = skb_clone(skb, GFP_ATOMIC);
1183
1184 bt_cb(skb)->retries++;
1185
1186 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1187 control &= L2CAP_CTRL_SAR;
1188
1189 if (chan->conn_state & L2CAP_CONN_SEND_FBIT) {
1190 control |= L2CAP_CTRL_FINAL;
1191 chan->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1192 }
1193 control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1194 | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1195 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1196
1197
1198 if (chan->fcs == L2CAP_FCS_CRC16) {
1199 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1200 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1201 }
1202
1203 l2cap_do_send(chan, tx_skb);
1204
1205 __mod_retrans_timer();
1206
1207 bt_cb(skb)->tx_seq = chan->next_tx_seq;
1208 chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
1209
1210 if (bt_cb(skb)->retries == 1)
1211 chan->unacked_frames++;
1212
1213 chan->frames_sent++;
1214
1215 if (skb_queue_is_last(&chan->tx_q, skb))
1216 chan->tx_send_head = NULL;
1217 else
1218 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
1219
1220 nsent++;
1221 }
1222
1223 return nsent;
1224 }
1225
1226 static int l2cap_retransmit_frames(struct l2cap_chan *chan)
1227 {
1228 int ret;
1229
1230 if (!skb_queue_empty(&chan->tx_q))
1231 chan->tx_send_head = chan->tx_q.next;
1232
1233 chan->next_tx_seq = chan->expected_ack_seq;
1234 ret = l2cap_ertm_send(chan);
1235 return ret;
1236 }
1237
1238 static void l2cap_send_ack(struct l2cap_chan *chan)
1239 {
1240 u16 control = 0;
1241
1242 control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1243
1244 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1245 control |= L2CAP_SUPER_RCV_NOT_READY;
1246 chan->conn_state |= L2CAP_CONN_RNR_SENT;
1247 l2cap_send_sframe(chan, control);
1248 return;
1249 }
1250
1251 if (l2cap_ertm_send(chan) > 0)
1252 return;
1253
1254 control |= L2CAP_SUPER_RCV_READY;
1255 l2cap_send_sframe(chan, control);
1256 }
1257
1258 static void l2cap_send_srejtail(struct l2cap_chan *chan)
1259 {
1260 struct srej_list *tail;
1261 u16 control;
1262
1263 control = L2CAP_SUPER_SELECT_REJECT;
1264 control |= L2CAP_CTRL_FINAL;
1265
1266 tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
1267 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1268
1269 l2cap_send_sframe(chan, control);
1270 }
1271
1272 static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1273 {
1274 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
1275 struct sk_buff **frag;
1276 int err, sent = 0;
1277
1278 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1279 return -EFAULT;
1280
1281 sent += count;
1282 len -= count;
1283
1284 /* Continuation fragments (no L2CAP header) */
1285 frag = &skb_shinfo(skb)->frag_list;
1286 while (len) {
1287 count = min_t(unsigned int, conn->mtu, len);
1288
1289 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1290 if (!*frag)
1291 return err;
1292 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1293 return -EFAULT;
1294
1295 sent += count;
1296 len -= count;
1297
1298 frag = &(*frag)->next;
1299 }
1300
1301 return sent;
1302 }
1303
1304 struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1305 {
1306 struct sock *sk = chan->sk;
1307 struct l2cap_conn *conn = chan->conn;
1308 struct sk_buff *skb;
1309 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1310 struct l2cap_hdr *lh;
1311
1312 BT_DBG("sk %p len %d", sk, (int)len);
1313
1314 count = min_t(unsigned int, (conn->mtu - hlen), len);
1315 skb = bt_skb_send_alloc(sk, count + hlen,
1316 msg->msg_flags & MSG_DONTWAIT, &err);
1317 if (!skb)
1318 return ERR_PTR(err);
1319
1320 /* Create L2CAP header */
1321 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1322 lh->cid = cpu_to_le16(chan->dcid);
1323 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1324 put_unaligned_le16(chan->psm, skb_put(skb, 2));
1325
1326 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1327 if (unlikely(err < 0)) {
1328 kfree_skb(skb);
1329 return ERR_PTR(err);
1330 }
1331 return skb;
1332 }
1333
1334 struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1335 {
1336 struct sock *sk = chan->sk;
1337 struct l2cap_conn *conn = chan->conn;
1338 struct sk_buff *skb;
1339 int err, count, hlen = L2CAP_HDR_SIZE;
1340 struct l2cap_hdr *lh;
1341
1342 BT_DBG("sk %p len %d", sk, (int)len);
1343
1344 count = min_t(unsigned int, (conn->mtu - hlen), len);
1345 skb = bt_skb_send_alloc(sk, count + hlen,
1346 msg->msg_flags & MSG_DONTWAIT, &err);
1347 if (!skb)
1348 return ERR_PTR(err);
1349
1350 /* Create L2CAP header */
1351 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1352 lh->cid = cpu_to_le16(chan->dcid);
1353 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1354
1355 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1356 if (unlikely(err < 0)) {
1357 kfree_skb(skb);
1358 return ERR_PTR(err);
1359 }
1360 return skb;
1361 }
1362
1363 struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1364 {
1365 struct sock *sk = chan->sk;
1366 struct l2cap_conn *conn = chan->conn;
1367 struct sk_buff *skb;
1368 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1369 struct l2cap_hdr *lh;
1370
1371 BT_DBG("sk %p len %d", sk, (int)len);
1372
1373 if (!conn)
1374 return ERR_PTR(-ENOTCONN);
1375
1376 if (sdulen)
1377 hlen += 2;
1378
1379 if (chan->fcs == L2CAP_FCS_CRC16)
1380 hlen += 2;
1381
1382 count = min_t(unsigned int, (conn->mtu - hlen), len);
1383 skb = bt_skb_send_alloc(sk, count + hlen,
1384 msg->msg_flags & MSG_DONTWAIT, &err);
1385 if (!skb)
1386 return ERR_PTR(err);
1387
1388 /* Create L2CAP header */
1389 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1390 lh->cid = cpu_to_le16(chan->dcid);
1391 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1392 put_unaligned_le16(control, skb_put(skb, 2));
1393 if (sdulen)
1394 put_unaligned_le16(sdulen, skb_put(skb, 2));
1395
1396 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1397 if (unlikely(err < 0)) {
1398 kfree_skb(skb);
1399 return ERR_PTR(err);
1400 }
1401
1402 if (chan->fcs == L2CAP_FCS_CRC16)
1403 put_unaligned_le16(0, skb_put(skb, 2));
1404
1405 bt_cb(skb)->retries = 0;
1406 return skb;
1407 }
1408
1409 int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1410 {
1411 struct sk_buff *skb;
1412 struct sk_buff_head sar_queue;
1413 u16 control;
1414 size_t size = 0;
1415
1416 skb_queue_head_init(&sar_queue);
1417 control = L2CAP_SDU_START;
1418 skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len);
1419 if (IS_ERR(skb))
1420 return PTR_ERR(skb);
1421
1422 __skb_queue_tail(&sar_queue, skb);
1423 len -= chan->remote_mps;
1424 size += chan->remote_mps;
1425
1426 while (len > 0) {
1427 size_t buflen;
1428
1429 if (len > chan->remote_mps) {
1430 control = L2CAP_SDU_CONTINUE;
1431 buflen = chan->remote_mps;
1432 } else {
1433 control = L2CAP_SDU_END;
1434 buflen = len;
1435 }
1436
1437 skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0);
1438 if (IS_ERR(skb)) {
1439 skb_queue_purge(&sar_queue);
1440 return PTR_ERR(skb);
1441 }
1442
1443 __skb_queue_tail(&sar_queue, skb);
1444 len -= buflen;
1445 size += buflen;
1446 }
1447 skb_queue_splice_tail(&sar_queue, &chan->tx_q);
1448 if (chan->tx_send_head == NULL)
1449 chan->tx_send_head = sar_queue.next;
1450
1451 return size;
1452 }
1453
1454 static void l2cap_chan_ready(struct sock *sk)
1455 {
1456 struct sock *parent = bt_sk(sk)->parent;
1457 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1458
1459 BT_DBG("sk %p, parent %p", sk, parent);
1460
1461 chan->conf_state = 0;
1462 l2cap_sock_clear_timer(sk);
1463
1464 if (!parent) {
1465 /* Outgoing channel.
1466 * Wake up socket sleeping on connect.
1467 */
1468 sk->sk_state = BT_CONNECTED;
1469 sk->sk_state_change(sk);
1470 } else {
1471 /* Incoming channel.
1472 * Wake up socket sleeping on accept.
1473 */
1474 parent->sk_data_ready(parent, 0);
1475 }
1476 }
1477
1478 /* Copy frame to all raw sockets on that connection */
1479 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
1480 {
1481 struct sk_buff *nskb;
1482 struct l2cap_chan *chan;
1483
1484 BT_DBG("conn %p", conn);
1485
1486 read_lock(&conn->chan_lock);
1487 list_for_each_entry(chan, &conn->chan_l, list) {
1488 struct sock *sk = chan->sk;
1489 if (sk->sk_type != SOCK_RAW)
1490 continue;
1491
1492 /* Don't send frame to the socket it came from */
1493 if (skb->sk == sk)
1494 continue;
1495 nskb = skb_clone(skb, GFP_ATOMIC);
1496 if (!nskb)
1497 continue;
1498
1499 if (sock_queue_rcv_skb(sk, nskb))
1500 kfree_skb(nskb);
1501 }
1502 read_unlock(&conn->chan_lock);
1503 }
1504
1505 /* ---- L2CAP signalling commands ---- */
1506 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
1507 u8 code, u8 ident, u16 dlen, void *data)
1508 {
1509 struct sk_buff *skb, **frag;
1510 struct l2cap_cmd_hdr *cmd;
1511 struct l2cap_hdr *lh;
1512 int len, count;
1513
1514 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
1515 conn, code, ident, dlen);
1516
1517 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
1518 count = min_t(unsigned int, conn->mtu, len);
1519
1520 skb = bt_skb_alloc(count, GFP_ATOMIC);
1521 if (!skb)
1522 return NULL;
1523
1524 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1525 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
1526
1527 if (conn->hcon->type == LE_LINK)
1528 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
1529 else
1530 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1531
1532 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
1533 cmd->code = code;
1534 cmd->ident = ident;
1535 cmd->len = cpu_to_le16(dlen);
1536
1537 if (dlen) {
1538 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
1539 memcpy(skb_put(skb, count), data, count);
1540 data += count;
1541 }
1542
1543 len -= skb->len;
1544
1545 /* Continuation fragments (no L2CAP header) */
1546 frag = &skb_shinfo(skb)->frag_list;
1547 while (len) {
1548 count = min_t(unsigned int, conn->mtu, len);
1549
1550 *frag = bt_skb_alloc(count, GFP_ATOMIC);
1551 if (!*frag)
1552 goto fail;
1553
1554 memcpy(skb_put(*frag, count), data, count);
1555
1556 len -= count;
1557 data += count;
1558
1559 frag = &(*frag)->next;
1560 }
1561
1562 return skb;
1563
1564 fail:
1565 kfree_skb(skb);
1566 return NULL;
1567 }
1568
1569 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
1570 {
1571 struct l2cap_conf_opt *opt = *ptr;
1572 int len;
1573
1574 len = L2CAP_CONF_OPT_SIZE + opt->len;
1575 *ptr += len;
1576
1577 *type = opt->type;
1578 *olen = opt->len;
1579
1580 switch (opt->len) {
1581 case 1:
1582 *val = *((u8 *) opt->val);
1583 break;
1584
1585 case 2:
1586 *val = get_unaligned_le16(opt->val);
1587 break;
1588
1589 case 4:
1590 *val = get_unaligned_le32(opt->val);
1591 break;
1592
1593 default:
1594 *val = (unsigned long) opt->val;
1595 break;
1596 }
1597
1598 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
1599 return len;
1600 }
1601
1602 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
1603 {
1604 struct l2cap_conf_opt *opt = *ptr;
1605
1606 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
1607
1608 opt->type = type;
1609 opt->len = len;
1610
1611 switch (len) {
1612 case 1:
1613 *((u8 *) opt->val) = val;
1614 break;
1615
1616 case 2:
1617 put_unaligned_le16(val, opt->val);
1618 break;
1619
1620 case 4:
1621 put_unaligned_le32(val, opt->val);
1622 break;
1623
1624 default:
1625 memcpy(opt->val, (void *) val, len);
1626 break;
1627 }
1628
1629 *ptr += L2CAP_CONF_OPT_SIZE + len;
1630 }
1631
1632 static void l2cap_ack_timeout(unsigned long arg)
1633 {
1634 struct l2cap_chan *chan = (void *) arg;
1635
1636 bh_lock_sock(chan->sk);
1637 l2cap_send_ack(chan);
1638 bh_unlock_sock(chan->sk);
1639 }
1640
1641 static inline void l2cap_ertm_init(struct l2cap_chan *chan)
1642 {
1643 struct sock *sk = chan->sk;
1644
1645 chan->expected_ack_seq = 0;
1646 chan->unacked_frames = 0;
1647 chan->buffer_seq = 0;
1648 chan->num_acked = 0;
1649 chan->frames_sent = 0;
1650
1651 setup_timer(&chan->retrans_timer, l2cap_retrans_timeout,
1652 (unsigned long) chan);
1653 setup_timer(&chan->monitor_timer, l2cap_monitor_timeout,
1654 (unsigned long) chan);
1655 setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan);
1656
1657 skb_queue_head_init(&chan->srej_q);
1658 skb_queue_head_init(&chan->busy_q);
1659
1660 INIT_LIST_HEAD(&chan->srej_l);
1661
1662 INIT_WORK(&chan->busy_work, l2cap_busy_work);
1663
1664 sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
1665 }
1666
1667 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
1668 {
1669 switch (mode) {
1670 case L2CAP_MODE_STREAMING:
1671 case L2CAP_MODE_ERTM:
1672 if (l2cap_mode_supported(mode, remote_feat_mask))
1673 return mode;
1674 /* fall through */
1675 default:
1676 return L2CAP_MODE_BASIC;
1677 }
1678 }
1679
1680 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1681 {
1682 struct l2cap_conf_req *req = data;
1683 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1684 void *ptr = req->data;
1685
1686 BT_DBG("chan %p", chan);
1687
1688 if (chan->num_conf_req || chan->num_conf_rsp)
1689 goto done;
1690
1691 switch (chan->mode) {
1692 case L2CAP_MODE_STREAMING:
1693 case L2CAP_MODE_ERTM:
1694 if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE)
1695 break;
1696
1697 /* fall through */
1698 default:
1699 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
1700 break;
1701 }
1702
1703 done:
1704 if (chan->imtu != L2CAP_DEFAULT_MTU)
1705 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
1706
1707 switch (chan->mode) {
1708 case L2CAP_MODE_BASIC:
1709 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
1710 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
1711 break;
1712
1713 rfc.mode = L2CAP_MODE_BASIC;
1714 rfc.txwin_size = 0;
1715 rfc.max_transmit = 0;
1716 rfc.retrans_timeout = 0;
1717 rfc.monitor_timeout = 0;
1718 rfc.max_pdu_size = 0;
1719
1720 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1721 (unsigned long) &rfc);
1722 break;
1723
1724 case L2CAP_MODE_ERTM:
1725 rfc.mode = L2CAP_MODE_ERTM;
1726 rfc.txwin_size = chan->tx_win;
1727 rfc.max_transmit = chan->max_tx;
1728 rfc.retrans_timeout = 0;
1729 rfc.monitor_timeout = 0;
1730 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
1731 if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
1732 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1733
1734 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1735 (unsigned long) &rfc);
1736
1737 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
1738 break;
1739
1740 if (chan->fcs == L2CAP_FCS_NONE ||
1741 chan->conf_state & L2CAP_CONF_NO_FCS_RECV) {
1742 chan->fcs = L2CAP_FCS_NONE;
1743 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
1744 }
1745 break;
1746
1747 case L2CAP_MODE_STREAMING:
1748 rfc.mode = L2CAP_MODE_STREAMING;
1749 rfc.txwin_size = 0;
1750 rfc.max_transmit = 0;
1751 rfc.retrans_timeout = 0;
1752 rfc.monitor_timeout = 0;
1753 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
1754 if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
1755 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1756
1757 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1758 (unsigned long) &rfc);
1759
1760 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
1761 break;
1762
1763 if (chan->fcs == L2CAP_FCS_NONE ||
1764 chan->conf_state & L2CAP_CONF_NO_FCS_RECV) {
1765 chan->fcs = L2CAP_FCS_NONE;
1766 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
1767 }
1768 break;
1769 }
1770
1771 req->dcid = cpu_to_le16(chan->dcid);
1772 req->flags = cpu_to_le16(0);
1773
1774 return ptr - data;
1775 }
1776
1777 static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1778 {
1779 struct l2cap_conf_rsp *rsp = data;
1780 void *ptr = rsp->data;
1781 void *req = chan->conf_req;
1782 int len = chan->conf_len;
1783 int type, hint, olen;
1784 unsigned long val;
1785 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
1786 u16 mtu = L2CAP_DEFAULT_MTU;
1787 u16 result = L2CAP_CONF_SUCCESS;
1788
1789 BT_DBG("chan %p", chan);
1790
1791 while (len >= L2CAP_CONF_OPT_SIZE) {
1792 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1793
1794 hint = type & L2CAP_CONF_HINT;
1795 type &= L2CAP_CONF_MASK;
1796
1797 switch (type) {
1798 case L2CAP_CONF_MTU:
1799 mtu = val;
1800 break;
1801
1802 case L2CAP_CONF_FLUSH_TO:
1803 chan->flush_to = val;
1804 break;
1805
1806 case L2CAP_CONF_QOS:
1807 break;
1808
1809 case L2CAP_CONF_RFC:
1810 if (olen == sizeof(rfc))
1811 memcpy(&rfc, (void *) val, olen);
1812 break;
1813
1814 case L2CAP_CONF_FCS:
1815 if (val == L2CAP_FCS_NONE)
1816 chan->conf_state |= L2CAP_CONF_NO_FCS_RECV;
1817
1818 break;
1819
1820 default:
1821 if (hint)
1822 break;
1823
1824 result = L2CAP_CONF_UNKNOWN;
1825 *((u8 *) ptr++) = type;
1826 break;
1827 }
1828 }
1829
1830 if (chan->num_conf_rsp || chan->num_conf_req > 1)
1831 goto done;
1832
1833 switch (chan->mode) {
1834 case L2CAP_MODE_STREAMING:
1835 case L2CAP_MODE_ERTM:
1836 if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
1837 chan->mode = l2cap_select_mode(rfc.mode,
1838 chan->conn->feat_mask);
1839 break;
1840 }
1841
1842 if (chan->mode != rfc.mode)
1843 return -ECONNREFUSED;
1844
1845 break;
1846 }
1847
1848 done:
1849 if (chan->mode != rfc.mode) {
1850 result = L2CAP_CONF_UNACCEPT;
1851 rfc.mode = chan->mode;
1852
1853 if (chan->num_conf_rsp == 1)
1854 return -ECONNREFUSED;
1855
1856 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
1857 sizeof(rfc), (unsigned long) &rfc);
1858 }
1859
1860
1861 if (result == L2CAP_CONF_SUCCESS) {
1862 /* Configure output options and let the other side know
1863 * which ones we don't like. */
1864
1865 if (mtu < L2CAP_DEFAULT_MIN_MTU)
1866 result = L2CAP_CONF_UNACCEPT;
1867 else {
1868 chan->omtu = mtu;
1869 chan->conf_state |= L2CAP_CONF_MTU_DONE;
1870 }
1871 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
1872
1873 switch (rfc.mode) {
1874 case L2CAP_MODE_BASIC:
1875 chan->fcs = L2CAP_FCS_NONE;
1876 chan->conf_state |= L2CAP_CONF_MODE_DONE;
1877 break;
1878
1879 case L2CAP_MODE_ERTM:
1880 chan->remote_tx_win = rfc.txwin_size;
1881 chan->remote_max_tx = rfc.max_transmit;
1882
1883 if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
1884 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1885
1886 chan->remote_mps = le16_to_cpu(rfc.max_pdu_size);
1887
1888 rfc.retrans_timeout =
1889 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
1890 rfc.monitor_timeout =
1891 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
1892
1893 chan->conf_state |= L2CAP_CONF_MODE_DONE;
1894
1895 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
1896 sizeof(rfc), (unsigned long) &rfc);
1897
1898 break;
1899
1900 case L2CAP_MODE_STREAMING:
1901 if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
1902 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1903
1904 chan->remote_mps = le16_to_cpu(rfc.max_pdu_size);
1905
1906 chan->conf_state |= L2CAP_CONF_MODE_DONE;
1907
1908 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
1909 sizeof(rfc), (unsigned long) &rfc);
1910
1911 break;
1912
1913 default:
1914 result = L2CAP_CONF_UNACCEPT;
1915
1916 memset(&rfc, 0, sizeof(rfc));
1917 rfc.mode = chan->mode;
1918 }
1919
1920 if (result == L2CAP_CONF_SUCCESS)
1921 chan->conf_state |= L2CAP_CONF_OUTPUT_DONE;
1922 }
1923 rsp->scid = cpu_to_le16(chan->dcid);
1924 rsp->result = cpu_to_le16(result);
1925 rsp->flags = cpu_to_le16(0x0000);
1926
1927 return ptr - data;
1928 }
1929
1930 static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
1931 {
1932 struct l2cap_conf_req *req = data;
1933 void *ptr = req->data;
1934 int type, olen;
1935 unsigned long val;
1936 struct l2cap_conf_rfc rfc;
1937
1938 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
1939
1940 while (len >= L2CAP_CONF_OPT_SIZE) {
1941 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
1942
1943 switch (type) {
1944 case L2CAP_CONF_MTU:
1945 if (val < L2CAP_DEFAULT_MIN_MTU) {
1946 *result = L2CAP_CONF_UNACCEPT;
1947 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
1948 } else
1949 chan->imtu = val;
1950 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
1951 break;
1952
1953 case L2CAP_CONF_FLUSH_TO:
1954 chan->flush_to = val;
1955 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
1956 2, chan->flush_to);
1957 break;
1958
1959 case L2CAP_CONF_RFC:
1960 if (olen == sizeof(rfc))
1961 memcpy(&rfc, (void *)val, olen);
1962
1963 if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
1964 rfc.mode != chan->mode)
1965 return -ECONNREFUSED;
1966
1967 chan->fcs = 0;
1968
1969 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
1970 sizeof(rfc), (unsigned long) &rfc);
1971 break;
1972 }
1973 }
1974
1975 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
1976 return -ECONNREFUSED;
1977
1978 chan->mode = rfc.mode;
1979
1980 if (*result == L2CAP_CONF_SUCCESS) {
1981 switch (rfc.mode) {
1982 case L2CAP_MODE_ERTM:
1983 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
1984 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
1985 chan->mps = le16_to_cpu(rfc.max_pdu_size);
1986 break;
1987 case L2CAP_MODE_STREAMING:
1988 chan->mps = le16_to_cpu(rfc.max_pdu_size);
1989 }
1990 }
1991
1992 req->dcid = cpu_to_le16(chan->dcid);
1993 req->flags = cpu_to_le16(0x0000);
1994
1995 return ptr - data;
1996 }
1997
1998 static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1999 {
2000 struct l2cap_conf_rsp *rsp = data;
2001 void *ptr = rsp->data;
2002
2003 BT_DBG("chan %p", chan);
2004
2005 rsp->scid = cpu_to_le16(chan->dcid);
2006 rsp->result = cpu_to_le16(result);
2007 rsp->flags = cpu_to_le16(flags);
2008
2009 return ptr - data;
2010 }
2011
2012 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
2013 {
2014 struct l2cap_conn_rsp rsp;
2015 struct l2cap_conn *conn = chan->conn;
2016 u8 buf[128];
2017
2018 rsp.scid = cpu_to_le16(chan->dcid);
2019 rsp.dcid = cpu_to_le16(chan->scid);
2020 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
2021 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
2022 l2cap_send_cmd(conn, chan->ident,
2023 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2024
2025 if (chan->conf_state & L2CAP_CONF_REQ_SENT)
2026 return;
2027
2028 chan->conf_state |= L2CAP_CONF_REQ_SENT;
2029 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2030 l2cap_build_conf_req(chan, buf), buf);
2031 chan->num_conf_req++;
2032 }
2033
2034 static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
2035 {
2036 int type, olen;
2037 unsigned long val;
2038 struct l2cap_conf_rfc rfc;
2039
2040 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
2041
2042 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
2043 return;
2044
2045 while (len >= L2CAP_CONF_OPT_SIZE) {
2046 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2047
2048 switch (type) {
2049 case L2CAP_CONF_RFC:
2050 if (olen == sizeof(rfc))
2051 memcpy(&rfc, (void *)val, olen);
2052 goto done;
2053 }
2054 }
2055
2056 done:
2057 switch (rfc.mode) {
2058 case L2CAP_MODE_ERTM:
2059 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2060 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2061 chan->mps = le16_to_cpu(rfc.max_pdu_size);
2062 break;
2063 case L2CAP_MODE_STREAMING:
2064 chan->mps = le16_to_cpu(rfc.max_pdu_size);
2065 }
2066 }
2067
2068 static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2069 {
2070 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2071
2072 if (rej->reason != 0x0000)
2073 return 0;
2074
2075 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2076 cmd->ident == conn->info_ident) {
2077 del_timer(&conn->info_timer);
2078
2079 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2080 conn->info_ident = 0;
2081
2082 l2cap_conn_start(conn);
2083 }
2084
2085 return 0;
2086 }
2087
2088 static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2089 {
2090 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2091 struct l2cap_conn_rsp rsp;
2092 struct l2cap_chan *chan = NULL, *pchan;
2093 struct sock *parent, *sk = NULL;
2094 int result, status = L2CAP_CS_NO_INFO;
2095
2096 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
2097 __le16 psm = req->psm;
2098
2099 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2100
2101 /* Check if we have socket listening on psm */
2102 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src);
2103 if (!pchan) {
2104 result = L2CAP_CR_BAD_PSM;
2105 goto sendresp;
2106 }
2107
2108 parent = pchan->sk;
2109
2110 bh_lock_sock(parent);
2111
2112 /* Check if the ACL is secure enough (if not SDP) */
2113 if (psm != cpu_to_le16(0x0001) &&
2114 !hci_conn_check_link_mode(conn->hcon)) {
2115 conn->disc_reason = 0x05;
2116 result = L2CAP_CR_SEC_BLOCK;
2117 goto response;
2118 }
2119
2120 result = L2CAP_CR_NO_MEM;
2121
2122 /* Check for backlog size */
2123 if (sk_acceptq_is_full(parent)) {
2124 BT_DBG("backlog full %d", parent->sk_ack_backlog);
2125 goto response;
2126 }
2127
2128 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
2129 if (!sk)
2130 goto response;
2131
2132 chan = l2cap_chan_create(sk);
2133 if (!chan) {
2134 l2cap_sock_kill(sk);
2135 goto response;
2136 }
2137
2138 l2cap_pi(sk)->chan = chan;
2139
2140 write_lock_bh(&conn->chan_lock);
2141
2142 /* Check if we already have channel with that dcid */
2143 if (__l2cap_get_chan_by_dcid(conn, scid)) {
2144 write_unlock_bh(&conn->chan_lock);
2145 sock_set_flag(sk, SOCK_ZAPPED);
2146 l2cap_sock_kill(sk);
2147 goto response;
2148 }
2149
2150 hci_conn_hold(conn->hcon);
2151
2152 l2cap_sock_init(sk, parent);
2153 bacpy(&bt_sk(sk)->src, conn->src);
2154 bacpy(&bt_sk(sk)->dst, conn->dst);
2155 chan->psm = psm;
2156 chan->dcid = scid;
2157
2158 bt_accept_enqueue(parent, sk);
2159
2160 __l2cap_chan_add(conn, chan);
2161
2162 dcid = chan->scid;
2163
2164 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2165
2166 chan->ident = cmd->ident;
2167
2168 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2169 if (l2cap_check_security(chan)) {
2170 if (bt_sk(sk)->defer_setup) {
2171 sk->sk_state = BT_CONNECT2;
2172 result = L2CAP_CR_PEND;
2173 status = L2CAP_CS_AUTHOR_PEND;
2174 parent->sk_data_ready(parent, 0);
2175 } else {
2176 sk->sk_state = BT_CONFIG;
2177 result = L2CAP_CR_SUCCESS;
2178 status = L2CAP_CS_NO_INFO;
2179 }
2180 } else {
2181 sk->sk_state = BT_CONNECT2;
2182 result = L2CAP_CR_PEND;
2183 status = L2CAP_CS_AUTHEN_PEND;
2184 }
2185 } else {
2186 sk->sk_state = BT_CONNECT2;
2187 result = L2CAP_CR_PEND;
2188 status = L2CAP_CS_NO_INFO;
2189 }
2190
2191 write_unlock_bh(&conn->chan_lock);
2192
2193 response:
2194 bh_unlock_sock(parent);
2195
2196 sendresp:
2197 rsp.scid = cpu_to_le16(scid);
2198 rsp.dcid = cpu_to_le16(dcid);
2199 rsp.result = cpu_to_le16(result);
2200 rsp.status = cpu_to_le16(status);
2201 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2202
2203 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2204 struct l2cap_info_req info;
2205 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2206
2207 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2208 conn->info_ident = l2cap_get_ident(conn);
2209
2210 mod_timer(&conn->info_timer, jiffies +
2211 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2212
2213 l2cap_send_cmd(conn, conn->info_ident,
2214 L2CAP_INFO_REQ, sizeof(info), &info);
2215 }
2216
2217 if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) &&
2218 result == L2CAP_CR_SUCCESS) {
2219 u8 buf[128];
2220 chan->conf_state |= L2CAP_CONF_REQ_SENT;
2221 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2222 l2cap_build_conf_req(chan, buf), buf);
2223 chan->num_conf_req++;
2224 }
2225
2226 return 0;
2227 }
2228
2229 static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2230 {
2231 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2232 u16 scid, dcid, result, status;
2233 struct l2cap_chan *chan;
2234 struct sock *sk;
2235 u8 req[128];
2236
2237 scid = __le16_to_cpu(rsp->scid);
2238 dcid = __le16_to_cpu(rsp->dcid);
2239 result = __le16_to_cpu(rsp->result);
2240 status = __le16_to_cpu(rsp->status);
2241
2242 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2243
2244 if (scid) {
2245 chan = l2cap_get_chan_by_scid(conn, scid);
2246 if (!chan)
2247 return -EFAULT;
2248 } else {
2249 chan = l2cap_get_chan_by_ident(conn, cmd->ident);
2250 if (!chan)
2251 return -EFAULT;
2252 }
2253
2254 sk = chan->sk;
2255
2256 switch (result) {
2257 case L2CAP_CR_SUCCESS:
2258 sk->sk_state = BT_CONFIG;
2259 chan->ident = 0;
2260 chan->dcid = dcid;
2261 chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
2262
2263 if (chan->conf_state & L2CAP_CONF_REQ_SENT)
2264 break;
2265
2266 chan->conf_state |= L2CAP_CONF_REQ_SENT;
2267
2268 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2269 l2cap_build_conf_req(chan, req), req);
2270 chan->num_conf_req++;
2271 break;
2272
2273 case L2CAP_CR_PEND:
2274 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
2275 break;
2276
2277 default:
2278 /* don't delete l2cap channel if sk is owned by user */
2279 if (sock_owned_by_user(sk)) {
2280 sk->sk_state = BT_DISCONN;
2281 l2cap_sock_clear_timer(sk);
2282 l2cap_sock_set_timer(sk, HZ / 5);
2283 break;
2284 }
2285
2286 l2cap_chan_del(chan, ECONNREFUSED);
2287 break;
2288 }
2289
2290 bh_unlock_sock(sk);
2291 return 0;
2292 }
2293
2294 static inline void set_default_fcs(struct l2cap_chan *chan)
2295 {
2296 struct l2cap_pinfo *pi = l2cap_pi(chan->sk);
2297
2298 /* FCS is enabled only in ERTM or streaming mode, if one or both
2299 * sides request it.
2300 */
2301 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
2302 chan->fcs = L2CAP_FCS_NONE;
2303 else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV))
2304 chan->fcs = L2CAP_FCS_CRC16;
2305 }
2306
2307 static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
2308 {
2309 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2310 u16 dcid, flags;
2311 u8 rsp[64];
2312 struct l2cap_chan *chan;
2313 struct sock *sk;
2314 int len;
2315
2316 dcid = __le16_to_cpu(req->dcid);
2317 flags = __le16_to_cpu(req->flags);
2318
2319 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2320
2321 chan = l2cap_get_chan_by_scid(conn, dcid);
2322 if (!chan)
2323 return -ENOENT;
2324
2325 sk = chan->sk;
2326
2327 if (sk->sk_state != BT_CONFIG && sk->sk_state != BT_CONNECT2) {
2328 struct l2cap_cmd_rej rej;
2329
2330 rej.reason = cpu_to_le16(0x0002);
2331 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
2332 sizeof(rej), &rej);
2333 goto unlock;
2334 }
2335
2336 /* Reject if config buffer is too small. */
2337 len = cmd_len - sizeof(*req);
2338 if (len < 0 || chan->conf_len + len > sizeof(chan->conf_req)) {
2339 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2340 l2cap_build_conf_rsp(chan, rsp,
2341 L2CAP_CONF_REJECT, flags), rsp);
2342 goto unlock;
2343 }
2344
2345 /* Store config. */
2346 memcpy(chan->conf_req + chan->conf_len, req->data, len);
2347 chan->conf_len += len;
2348
2349 if (flags & 0x0001) {
2350 /* Incomplete config. Send empty response. */
2351 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
2352 l2cap_build_conf_rsp(chan, rsp,
2353 L2CAP_CONF_SUCCESS, 0x0001), rsp);
2354 goto unlock;
2355 }
2356
2357 /* Complete config. */
2358 len = l2cap_parse_conf_req(chan, rsp);
2359 if (len < 0) {
2360 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2361 goto unlock;
2362 }
2363
2364 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
2365 chan->num_conf_rsp++;
2366
2367 /* Reset config buffer. */
2368 chan->conf_len = 0;
2369
2370 if (!(chan->conf_state & L2CAP_CONF_OUTPUT_DONE))
2371 goto unlock;
2372
2373 if (chan->conf_state & L2CAP_CONF_INPUT_DONE) {
2374 set_default_fcs(chan);
2375
2376 sk->sk_state = BT_CONNECTED;
2377
2378 chan->next_tx_seq = 0;
2379 chan->expected_tx_seq = 0;
2380 skb_queue_head_init(&chan->tx_q);
2381 if (chan->mode == L2CAP_MODE_ERTM)
2382 l2cap_ertm_init(chan);
2383
2384 l2cap_chan_ready(sk);
2385 goto unlock;
2386 }
2387
2388 if (!(chan->conf_state & L2CAP_CONF_REQ_SENT)) {
2389 u8 buf[64];
2390 chan->conf_state |= L2CAP_CONF_REQ_SENT;
2391 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2392 l2cap_build_conf_req(chan, buf), buf);
2393 chan->num_conf_req++;
2394 }
2395
2396 unlock:
2397 bh_unlock_sock(sk);
2398 return 0;
2399 }
2400
2401 static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2402 {
2403 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
2404 u16 scid, flags, result;
2405 struct l2cap_chan *chan;
2406 struct sock *sk;
2407 int len = cmd->len - sizeof(*rsp);
2408
2409 scid = __le16_to_cpu(rsp->scid);
2410 flags = __le16_to_cpu(rsp->flags);
2411 result = __le16_to_cpu(rsp->result);
2412
2413 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x",
2414 scid, flags, result);
2415
2416 chan = l2cap_get_chan_by_scid(conn, scid);
2417 if (!chan)
2418 return 0;
2419
2420 sk = chan->sk;
2421
2422 switch (result) {
2423 case L2CAP_CONF_SUCCESS:
2424 l2cap_conf_rfc_get(chan, rsp->data, len);
2425 break;
2426
2427 case L2CAP_CONF_UNACCEPT:
2428 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
2429 char req[64];
2430
2431 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
2432 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2433 goto done;
2434 }
2435
2436 /* throw out any old stored conf requests */
2437 result = L2CAP_CONF_SUCCESS;
2438 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
2439 req, &result);
2440 if (len < 0) {
2441 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2442 goto done;
2443 }
2444
2445 l2cap_send_cmd(conn, l2cap_get_ident(conn),
2446 L2CAP_CONF_REQ, len, req);
2447 chan->num_conf_req++;
2448 if (result != L2CAP_CONF_SUCCESS)
2449 goto done;
2450 break;
2451 }
2452
2453 default:
2454 sk->sk_err = ECONNRESET;
2455 l2cap_sock_set_timer(sk, HZ * 5);
2456 l2cap_send_disconn_req(conn, chan, ECONNRESET);
2457 goto done;
2458 }
2459
2460 if (flags & 0x01)
2461 goto done;
2462
2463 chan->conf_state |= L2CAP_CONF_INPUT_DONE;
2464
2465 if (chan->conf_state & L2CAP_CONF_OUTPUT_DONE) {
2466 set_default_fcs(chan);
2467
2468 sk->sk_state = BT_CONNECTED;
2469 chan->next_tx_seq = 0;
2470 chan->expected_tx_seq = 0;
2471 skb_queue_head_init(&chan->tx_q);
2472 if (chan->mode == L2CAP_MODE_ERTM)
2473 l2cap_ertm_init(chan);
2474
2475 l2cap_chan_ready(sk);
2476 }
2477
2478 done:
2479 bh_unlock_sock(sk);
2480 return 0;
2481 }
2482
2483 static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2484 {
2485 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
2486 struct l2cap_disconn_rsp rsp;
2487 u16 dcid, scid;
2488 struct l2cap_chan *chan;
2489 struct sock *sk;
2490
2491 scid = __le16_to_cpu(req->scid);
2492 dcid = __le16_to_cpu(req->dcid);
2493
2494 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
2495
2496 chan = l2cap_get_chan_by_scid(conn, dcid);
2497 if (!chan)
2498 return 0;
2499
2500 sk = chan->sk;
2501
2502 rsp.dcid = cpu_to_le16(chan->scid);
2503 rsp.scid = cpu_to_le16(chan->dcid);
2504 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
2505
2506 sk->sk_shutdown = SHUTDOWN_MASK;
2507
2508 /* don't delete l2cap channel if sk is owned by user */
2509 if (sock_owned_by_user(sk)) {
2510 sk->sk_state = BT_DISCONN;
2511 l2cap_sock_clear_timer(sk);
2512 l2cap_sock_set_timer(sk, HZ / 5);
2513 bh_unlock_sock(sk);
2514 return 0;
2515 }
2516
2517 l2cap_chan_del(chan, ECONNRESET);
2518 bh_unlock_sock(sk);
2519
2520 l2cap_sock_kill(sk);
2521 return 0;
2522 }
2523
2524 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2525 {
2526 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
2527 u16 dcid, scid;
2528 struct l2cap_chan *chan;
2529 struct sock *sk;
2530
2531 scid = __le16_to_cpu(rsp->scid);
2532 dcid = __le16_to_cpu(rsp->dcid);
2533
2534 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
2535
2536 chan = l2cap_get_chan_by_scid(conn, scid);
2537 if (!chan)
2538 return 0;
2539
2540 sk = chan->sk;
2541
2542 /* don't delete l2cap channel if sk is owned by user */
2543 if (sock_owned_by_user(sk)) {
2544 sk->sk_state = BT_DISCONN;
2545 l2cap_sock_clear_timer(sk);
2546 l2cap_sock_set_timer(sk, HZ / 5);
2547 bh_unlock_sock(sk);
2548 return 0;
2549 }
2550
2551 l2cap_chan_del(chan, 0);
2552 bh_unlock_sock(sk);
2553
2554 l2cap_sock_kill(sk);
2555 return 0;
2556 }
2557
2558 static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2559 {
2560 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
2561 u16 type;
2562
2563 type = __le16_to_cpu(req->type);
2564
2565 BT_DBG("type 0x%4.4x", type);
2566
2567 if (type == L2CAP_IT_FEAT_MASK) {
2568 u8 buf[8];
2569 u32 feat_mask = l2cap_feat_mask;
2570 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
2571 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2572 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
2573 if (!disable_ertm)
2574 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
2575 | L2CAP_FEAT_FCS;
2576 put_unaligned_le32(feat_mask, rsp->data);
2577 l2cap_send_cmd(conn, cmd->ident,
2578 L2CAP_INFO_RSP, sizeof(buf), buf);
2579 } else if (type == L2CAP_IT_FIXED_CHAN) {
2580 u8 buf[12];
2581 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
2582 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
2583 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
2584 memcpy(buf + 4, l2cap_fixed_chan, 8);
2585 l2cap_send_cmd(conn, cmd->ident,
2586 L2CAP_INFO_RSP, sizeof(buf), buf);
2587 } else {
2588 struct l2cap_info_rsp rsp;
2589 rsp.type = cpu_to_le16(type);
2590 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
2591 l2cap_send_cmd(conn, cmd->ident,
2592 L2CAP_INFO_RSP, sizeof(rsp), &rsp);
2593 }
2594
2595 return 0;
2596 }
2597
2598 static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2599 {
2600 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
2601 u16 type, result;
2602
2603 type = __le16_to_cpu(rsp->type);
2604 result = __le16_to_cpu(rsp->result);
2605
2606 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
2607
2608 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
2609 if (cmd->ident != conn->info_ident ||
2610 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
2611 return 0;
2612
2613 del_timer(&conn->info_timer);
2614
2615 if (result != L2CAP_IR_SUCCESS) {
2616 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2617 conn->info_ident = 0;
2618
2619 l2cap_conn_start(conn);
2620
2621 return 0;
2622 }
2623
2624 if (type == L2CAP_IT_FEAT_MASK) {
2625 conn->feat_mask = get_unaligned_le32(rsp->data);
2626
2627 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
2628 struct l2cap_info_req req;
2629 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
2630
2631 conn->info_ident = l2cap_get_ident(conn);
2632
2633 l2cap_send_cmd(conn, conn->info_ident,
2634 L2CAP_INFO_REQ, sizeof(req), &req);
2635 } else {
2636 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2637 conn->info_ident = 0;
2638
2639 l2cap_conn_start(conn);
2640 }
2641 } else if (type == L2CAP_IT_FIXED_CHAN) {
2642 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2643 conn->info_ident = 0;
2644
2645 l2cap_conn_start(conn);
2646 }
2647
2648 return 0;
2649 }
2650
2651 static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
2652 u16 to_multiplier)
2653 {
2654 u16 max_latency;
2655
2656 if (min > max || min < 6 || max > 3200)
2657 return -EINVAL;
2658
2659 if (to_multiplier < 10 || to_multiplier > 3200)
2660 return -EINVAL;
2661
2662 if (max >= to_multiplier * 8)
2663 return -EINVAL;
2664
2665 max_latency = (to_multiplier * 8 / max) - 1;
2666 if (latency > 499 || latency > max_latency)
2667 return -EINVAL;
2668
2669 return 0;
2670 }
2671
2672 static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
2673 struct l2cap_cmd_hdr *cmd, u8 *data)
2674 {
2675 struct hci_conn *hcon = conn->hcon;
2676 struct l2cap_conn_param_update_req *req;
2677 struct l2cap_conn_param_update_rsp rsp;
2678 u16 min, max, latency, to_multiplier, cmd_len;
2679 int err;
2680
2681 if (!(hcon->link_mode & HCI_LM_MASTER))
2682 return -EINVAL;
2683
2684 cmd_len = __le16_to_cpu(cmd->len);
2685 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
2686 return -EPROTO;
2687
2688 req = (struct l2cap_conn_param_update_req *) data;
2689 min = __le16_to_cpu(req->min);
2690 max = __le16_to_cpu(req->max);
2691 latency = __le16_to_cpu(req->latency);
2692 to_multiplier = __le16_to_cpu(req->to_multiplier);
2693
2694 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
2695 min, max, latency, to_multiplier);
2696
2697 memset(&rsp, 0, sizeof(rsp));
2698
2699 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
2700 if (err)
2701 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
2702 else
2703 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
2704
2705 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
2706 sizeof(rsp), &rsp);
2707
2708 if (!err)
2709 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
2710
2711 return 0;
2712 }
2713
2714 static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
2715 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
2716 {
2717 int err = 0;
2718
2719 switch (cmd->code) {
2720 case L2CAP_COMMAND_REJ:
2721 l2cap_command_rej(conn, cmd, data);
2722 break;
2723
2724 case L2CAP_CONN_REQ:
2725 err = l2cap_connect_req(conn, cmd, data);
2726 break;
2727
2728 case L2CAP_CONN_RSP:
2729 err = l2cap_connect_rsp(conn, cmd, data);
2730 break;
2731
2732 case L2CAP_CONF_REQ:
2733 err = l2cap_config_req(conn, cmd, cmd_len, data);
2734 break;
2735
2736 case L2CAP_CONF_RSP:
2737 err = l2cap_config_rsp(conn, cmd, data);
2738 break;
2739
2740 case L2CAP_DISCONN_REQ:
2741 err = l2cap_disconnect_req(conn, cmd, data);
2742 break;
2743
2744 case L2CAP_DISCONN_RSP:
2745 err = l2cap_disconnect_rsp(conn, cmd, data);
2746 break;
2747
2748 case L2CAP_ECHO_REQ:
2749 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
2750 break;
2751
2752 case L2CAP_ECHO_RSP:
2753 break;
2754
2755 case L2CAP_INFO_REQ:
2756 err = l2cap_information_req(conn, cmd, data);
2757 break;
2758
2759 case L2CAP_INFO_RSP:
2760 err = l2cap_information_rsp(conn, cmd, data);
2761 break;
2762
2763 default:
2764 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
2765 err = -EINVAL;
2766 break;
2767 }
2768
2769 return err;
2770 }
2771
2772 static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
2773 struct l2cap_cmd_hdr *cmd, u8 *data)
2774 {
2775 switch (cmd->code) {
2776 case L2CAP_COMMAND_REJ:
2777 return 0;
2778
2779 case L2CAP_CONN_PARAM_UPDATE_REQ:
2780 return l2cap_conn_param_update_req(conn, cmd, data);
2781
2782 case L2CAP_CONN_PARAM_UPDATE_RSP:
2783 return 0;
2784
2785 default:
2786 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
2787 return -EINVAL;
2788 }
2789 }
2790
2791 static inline void l2cap_sig_channel(struct l2cap_conn *conn,
2792 struct sk_buff *skb)
2793 {
2794 u8 *data = skb->data;
2795 int len = skb->len;
2796 struct l2cap_cmd_hdr cmd;
2797 int err;
2798
2799 l2cap_raw_recv(conn, skb);
2800
2801 while (len >= L2CAP_CMD_HDR_SIZE) {
2802 u16 cmd_len;
2803 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
2804 data += L2CAP_CMD_HDR_SIZE;
2805 len -= L2CAP_CMD_HDR_SIZE;
2806
2807 cmd_len = le16_to_cpu(cmd.len);
2808
2809 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident);
2810
2811 if (cmd_len > len || !cmd.ident) {
2812 BT_DBG("corrupted command");
2813 break;
2814 }
2815
2816 if (conn->hcon->type == LE_LINK)
2817 err = l2cap_le_sig_cmd(conn, &cmd, data);
2818 else
2819 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
2820
2821 if (err) {
2822 struct l2cap_cmd_rej rej;
2823
2824 BT_ERR("Wrong link type (%d)", err);
2825
2826 /* FIXME: Map err to a valid reason */
2827 rej.reason = cpu_to_le16(0);
2828 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
2829 }
2830
2831 data += cmd_len;
2832 len -= cmd_len;
2833 }
2834
2835 kfree_skb(skb);
2836 }
2837
2838 static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
2839 {
2840 u16 our_fcs, rcv_fcs;
2841 int hdr_size = L2CAP_HDR_SIZE + 2;
2842
2843 if (chan->fcs == L2CAP_FCS_CRC16) {
2844 skb_trim(skb, skb->len - 2);
2845 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
2846 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
2847
2848 if (our_fcs != rcv_fcs)
2849 return -EBADMSG;
2850 }
2851 return 0;
2852 }
2853
2854 static inline void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
2855 {
2856 u16 control = 0;
2857
2858 chan->frames_sent = 0;
2859
2860 control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
2861
2862 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
2863 control |= L2CAP_SUPER_RCV_NOT_READY;
2864 l2cap_send_sframe(chan, control);
2865 chan->conn_state |= L2CAP_CONN_RNR_SENT;
2866 }
2867
2868 if (chan->conn_state & L2CAP_CONN_REMOTE_BUSY)
2869 l2cap_retransmit_frames(chan);
2870
2871 l2cap_ertm_send(chan);
2872
2873 if (!(chan->conn_state & L2CAP_CONN_LOCAL_BUSY) &&
2874 chan->frames_sent == 0) {
2875 control |= L2CAP_SUPER_RCV_READY;
2876 l2cap_send_sframe(chan, control);
2877 }
2878 }
2879
2880 static int l2cap_add_to_srej_queue(struct l2cap_chan *chan, struct sk_buff *skb, u8 tx_seq, u8 sar)
2881 {
2882 struct sk_buff *next_skb;
2883 int tx_seq_offset, next_tx_seq_offset;
2884
2885 bt_cb(skb)->tx_seq = tx_seq;
2886 bt_cb(skb)->sar = sar;
2887
2888 next_skb = skb_peek(&chan->srej_q);
2889 if (!next_skb) {
2890 __skb_queue_tail(&chan->srej_q, skb);
2891 return 0;
2892 }
2893
2894 tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
2895 if (tx_seq_offset < 0)
2896 tx_seq_offset += 64;
2897
2898 do {
2899 if (bt_cb(next_skb)->tx_seq == tx_seq)
2900 return -EINVAL;
2901
2902 next_tx_seq_offset = (bt_cb(next_skb)->tx_seq -
2903 chan->buffer_seq) % 64;
2904 if (next_tx_seq_offset < 0)
2905 next_tx_seq_offset += 64;
2906
2907 if (next_tx_seq_offset > tx_seq_offset) {
2908 __skb_queue_before(&chan->srej_q, next_skb, skb);
2909 return 0;
2910 }
2911
2912 if (skb_queue_is_last(&chan->srej_q, next_skb))
2913 break;
2914
2915 } while ((next_skb = skb_queue_next(&chan->srej_q, next_skb)));
2916
2917 __skb_queue_tail(&chan->srej_q, skb);
2918
2919 return 0;
2920 }
2921
2922 static int l2cap_ertm_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control)
2923 {
2924 struct sk_buff *_skb;
2925 int err;
2926
2927 switch (control & L2CAP_CTRL_SAR) {
2928 case L2CAP_SDU_UNSEGMENTED:
2929 if (chan->conn_state & L2CAP_CONN_SAR_SDU)
2930 goto drop;
2931
2932 err = sock_queue_rcv_skb(chan->sk, skb);
2933 if (!err)
2934 return err;
2935
2936 break;
2937
2938 case L2CAP_SDU_START:
2939 if (chan->conn_state & L2CAP_CONN_SAR_SDU)
2940 goto drop;
2941
2942 chan->sdu_len = get_unaligned_le16(skb->data);
2943
2944 if (chan->sdu_len > chan->imtu)
2945 goto disconnect;
2946
2947 chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC);
2948 if (!chan->sdu)
2949 return -ENOMEM;
2950
2951 /* pull sdu_len bytes only after alloc, because of Local Busy
2952 * condition we have to be sure that this will be executed
2953 * only once, i.e., when alloc does not fail */
2954 skb_pull(skb, 2);
2955
2956 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
2957
2958 chan->conn_state |= L2CAP_CONN_SAR_SDU;
2959 chan->partial_sdu_len = skb->len;
2960 break;
2961
2962 case L2CAP_SDU_CONTINUE:
2963 if (!(chan->conn_state & L2CAP_CONN_SAR_SDU))
2964 goto disconnect;
2965
2966 if (!chan->sdu)
2967 goto disconnect;
2968
2969 chan->partial_sdu_len += skb->len;
2970 if (chan->partial_sdu_len > chan->sdu_len)
2971 goto drop;
2972
2973 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
2974
2975 break;
2976
2977 case L2CAP_SDU_END:
2978 if (!(chan->conn_state & L2CAP_CONN_SAR_SDU))
2979 goto disconnect;
2980
2981 if (!chan->sdu)
2982 goto disconnect;
2983
2984 if (!(chan->conn_state & L2CAP_CONN_SAR_RETRY)) {
2985 chan->partial_sdu_len += skb->len;
2986
2987 if (chan->partial_sdu_len > chan->imtu)
2988 goto drop;
2989
2990 if (chan->partial_sdu_len != chan->sdu_len)
2991 goto drop;
2992
2993 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
2994 }
2995
2996 _skb = skb_clone(chan->sdu, GFP_ATOMIC);
2997 if (!_skb) {
2998 chan->conn_state |= L2CAP_CONN_SAR_RETRY;
2999 return -ENOMEM;
3000 }
3001
3002 err = sock_queue_rcv_skb(chan->sk, _skb);
3003 if (err < 0) {
3004 kfree_skb(_skb);
3005 chan->conn_state |= L2CAP_CONN_SAR_RETRY;
3006 return err;
3007 }
3008
3009 chan->conn_state &= ~L2CAP_CONN_SAR_RETRY;
3010 chan->conn_state &= ~L2CAP_CONN_SAR_SDU;
3011
3012 kfree_skb(chan->sdu);
3013 break;
3014 }
3015
3016 kfree_skb(skb);
3017 return 0;
3018
3019 drop:
3020 kfree_skb(chan->sdu);
3021 chan->sdu = NULL;
3022
3023 disconnect:
3024 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3025 kfree_skb(skb);
3026 return 0;
3027 }
3028
3029 static int l2cap_try_push_rx_skb(struct l2cap_chan *chan)
3030 {
3031 struct sk_buff *skb;
3032 u16 control;
3033 int err;
3034
3035 while ((skb = skb_dequeue(&chan->busy_q))) {
3036 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3037 err = l2cap_ertm_reassembly_sdu(chan, skb, control);
3038 if (err < 0) {
3039 skb_queue_head(&chan->busy_q, skb);
3040 return -EBUSY;
3041 }
3042
3043 chan->buffer_seq = (chan->buffer_seq + 1) % 64;
3044 }
3045
3046 if (!(chan->conn_state & L2CAP_CONN_RNR_SENT))
3047 goto done;
3048
3049 control = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3050 control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL;
3051 l2cap_send_sframe(chan, control);
3052 chan->retry_count = 1;
3053
3054 del_timer(&chan->retrans_timer);
3055 __mod_monitor_timer();
3056
3057 chan->conn_state |= L2CAP_CONN_WAIT_F;
3058
3059 done:
3060 chan->conn_state &= ~L2CAP_CONN_LOCAL_BUSY;
3061 chan->conn_state &= ~L2CAP_CONN_RNR_SENT;
3062
3063 BT_DBG("chan %p, Exit local busy", chan);
3064
3065 return 0;
3066 }
3067
3068 static void l2cap_busy_work(struct work_struct *work)
3069 {
3070 DECLARE_WAITQUEUE(wait, current);
3071 struct l2cap_chan *chan =
3072 container_of(work, struct l2cap_chan, busy_work);
3073 struct sock *sk = chan->sk;
3074 int n_tries = 0, timeo = HZ/5, err;
3075 struct sk_buff *skb;
3076
3077 lock_sock(sk);
3078
3079 add_wait_queue(sk_sleep(sk), &wait);
3080 while ((skb = skb_peek(&chan->busy_q))) {
3081 set_current_state(TASK_INTERRUPTIBLE);
3082
3083 if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) {
3084 err = -EBUSY;
3085 l2cap_send_disconn_req(chan->conn, chan, EBUSY);
3086 break;
3087 }
3088
3089 if (!timeo)
3090 timeo = HZ/5;
3091
3092 if (signal_pending(current)) {
3093 err = sock_intr_errno(timeo);
3094 break;
3095 }
3096
3097 release_sock(sk);
3098 timeo = schedule_timeout(timeo);
3099 lock_sock(sk);
3100
3101 err = sock_error(sk);
3102 if (err)
3103 break;
3104
3105 if (l2cap_try_push_rx_skb(chan) == 0)
3106 break;
3107 }
3108
3109 set_current_state(TASK_RUNNING);
3110 remove_wait_queue(sk_sleep(sk), &wait);
3111
3112 release_sock(sk);
3113 }
3114
3115 static int l2cap_push_rx_skb(struct l2cap_chan *chan, struct sk_buff *skb, u16 control)
3116 {
3117 int sctrl, err;
3118
3119 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
3120 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3121 __skb_queue_tail(&chan->busy_q, skb);
3122 return l2cap_try_push_rx_skb(chan);
3123
3124
3125 }
3126
3127 err = l2cap_ertm_reassembly_sdu(chan, skb, control);
3128 if (err >= 0) {
3129 chan->buffer_seq = (chan->buffer_seq + 1) % 64;
3130 return err;
3131 }
3132
3133 /* Busy Condition */
3134 BT_DBG("chan %p, Enter local busy", chan);
3135
3136 chan->conn_state |= L2CAP_CONN_LOCAL_BUSY;
3137 bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT;
3138 __skb_queue_tail(&chan->busy_q, skb);
3139
3140 sctrl = chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3141 sctrl |= L2CAP_SUPER_RCV_NOT_READY;
3142 l2cap_send_sframe(chan, sctrl);
3143
3144 chan->conn_state |= L2CAP_CONN_RNR_SENT;
3145
3146 del_timer(&chan->ack_timer);
3147
3148 queue_work(_busy_wq, &chan->busy_work);
3149
3150 return err;
3151 }
3152
3153 static int l2cap_streaming_reassembly_sdu(struct l2cap_chan *chan, struct sk_buff *skb, u16 control)
3154 {
3155 struct sk_buff *_skb;
3156 int err = -EINVAL;
3157
3158 /*
3159 * TODO: We have to notify the userland if some data is lost with the
3160 * Streaming Mode.
3161 */
3162
3163 switch (control & L2CAP_CTRL_SAR) {
3164 case L2CAP_SDU_UNSEGMENTED:
3165 if (chan->conn_state & L2CAP_CONN_SAR_SDU) {
3166 kfree_skb(chan->sdu);
3167 break;
3168 }
3169
3170 err = sock_queue_rcv_skb(chan->sk, skb);
3171 if (!err)
3172 return 0;
3173
3174 break;
3175
3176 case L2CAP_SDU_START:
3177 if (chan->conn_state & L2CAP_CONN_SAR_SDU) {
3178 kfree_skb(chan->sdu);
3179 break;
3180 }
3181
3182 chan->sdu_len = get_unaligned_le16(skb->data);
3183 skb_pull(skb, 2);
3184
3185 if (chan->sdu_len > chan->imtu) {
3186 err = -EMSGSIZE;
3187 break;
3188 }
3189
3190 chan->sdu = bt_skb_alloc(chan->sdu_len, GFP_ATOMIC);
3191 if (!chan->sdu) {
3192 err = -ENOMEM;
3193 break;
3194 }
3195
3196 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
3197
3198 chan->conn_state |= L2CAP_CONN_SAR_SDU;
3199 chan->partial_sdu_len = skb->len;
3200 err = 0;
3201 break;
3202
3203 case L2CAP_SDU_CONTINUE:
3204 if (!(chan->conn_state & L2CAP_CONN_SAR_SDU))
3205 break;
3206
3207 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
3208
3209 chan->partial_sdu_len += skb->len;
3210 if (chan->partial_sdu_len > chan->sdu_len)
3211 kfree_skb(chan->sdu);
3212 else
3213 err = 0;
3214
3215 break;
3216
3217 case L2CAP_SDU_END:
3218 if (!(chan->conn_state & L2CAP_CONN_SAR_SDU))
3219 break;
3220
3221 memcpy(skb_put(chan->sdu, skb->len), skb->data, skb->len);
3222
3223 chan->conn_state &= ~L2CAP_CONN_SAR_SDU;
3224 chan->partial_sdu_len += skb->len;
3225
3226 if (chan->partial_sdu_len > chan->imtu)
3227 goto drop;
3228
3229 if (chan->partial_sdu_len == chan->sdu_len) {
3230 _skb = skb_clone(chan->sdu, GFP_ATOMIC);
3231 err = sock_queue_rcv_skb(chan->sk, _skb);
3232 if (err < 0)
3233 kfree_skb(_skb);
3234 }
3235 err = 0;
3236
3237 drop:
3238 kfree_skb(chan->sdu);
3239 break;
3240 }
3241
3242 kfree_skb(skb);
3243 return err;
3244 }
3245
3246 static void l2cap_check_srej_gap(struct l2cap_chan *chan, u8 tx_seq)
3247 {
3248 struct sk_buff *skb;
3249 u16 control;
3250
3251 while ((skb = skb_peek(&chan->srej_q))) {
3252 if (bt_cb(skb)->tx_seq != tx_seq)
3253 break;
3254
3255 skb = skb_dequeue(&chan->srej_q);
3256 control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT;
3257 l2cap_ertm_reassembly_sdu(chan, skb, control);
3258 chan->buffer_seq_srej =
3259 (chan->buffer_seq_srej + 1) % 64;
3260 tx_seq = (tx_seq + 1) % 64;
3261 }
3262 }
3263
3264 static void l2cap_resend_srejframe(struct l2cap_chan *chan, u8 tx_seq)
3265 {
3266 struct srej_list *l, *tmp;
3267 u16 control;
3268
3269 list_for_each_entry_safe(l, tmp, &chan->srej_l, list) {
3270 if (l->tx_seq == tx_seq) {
3271 list_del(&l->list);
3272 kfree(l);
3273 return;
3274 }
3275 control = L2CAP_SUPER_SELECT_REJECT;
3276 control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3277 l2cap_send_sframe(chan, control);
3278 list_del(&l->list);
3279 list_add_tail(&l->list, &chan->srej_l);
3280 }
3281 }
3282
3283 static void l2cap_send_srejframe(struct l2cap_chan *chan, u8 tx_seq)
3284 {
3285 struct srej_list *new;
3286 u16 control;
3287
3288 while (tx_seq != chan->expected_tx_seq) {
3289 control = L2CAP_SUPER_SELECT_REJECT;
3290 control |= chan->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
3291 l2cap_send_sframe(chan, control);
3292
3293 new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC);
3294 new->tx_seq = chan->expected_tx_seq;
3295 chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
3296 list_add_tail(&new->list, &chan->srej_l);
3297 }
3298 chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
3299 }
3300
3301 static inline int l2cap_data_channel_iframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb)
3302 {
3303 u8 tx_seq = __get_txseq(rx_control);
3304 u8 req_seq = __get_reqseq(rx_control);
3305 u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT;
3306 int tx_seq_offset, expected_tx_seq_offset;
3307 int num_to_ack = (chan->tx_win/6) + 1;
3308 int err = 0;
3309
3310 BT_DBG("chan %p len %d tx_seq %d rx_control 0x%4.4x", chan, skb->len,
3311 tx_seq, rx_control);
3312
3313 if (L2CAP_CTRL_FINAL & rx_control &&
3314 chan->conn_state & L2CAP_CONN_WAIT_F) {
3315 del_timer(&chan->monitor_timer);
3316 if (chan->unacked_frames > 0)
3317 __mod_retrans_timer();
3318 chan->conn_state &= ~L2CAP_CONN_WAIT_F;
3319 }
3320
3321 chan->expected_ack_seq = req_seq;
3322 l2cap_drop_acked_frames(chan);
3323
3324 if (tx_seq == chan->expected_tx_seq)
3325 goto expected;
3326
3327 tx_seq_offset = (tx_seq - chan->buffer_seq) % 64;
3328 if (tx_seq_offset < 0)
3329 tx_seq_offset += 64;
3330
3331 /* invalid tx_seq */
3332 if (tx_seq_offset >= chan->tx_win) {
3333 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3334 goto drop;
3335 }
3336
3337 if (chan->conn_state == L2CAP_CONN_LOCAL_BUSY)
3338 goto drop;
3339
3340 if (chan->conn_state & L2CAP_CONN_SREJ_SENT) {
3341 struct srej_list *first;
3342
3343 first = list_first_entry(&chan->srej_l,
3344 struct srej_list, list);
3345 if (tx_seq == first->tx_seq) {
3346 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
3347 l2cap_check_srej_gap(chan, tx_seq);
3348
3349 list_del(&first->list);
3350 kfree(first);
3351
3352 if (list_empty(&chan->srej_l)) {
3353 chan->buffer_seq = chan->buffer_seq_srej;
3354 chan->conn_state &= ~L2CAP_CONN_SREJ_SENT;
3355 l2cap_send_ack(chan);
3356 BT_DBG("chan %p, Exit SREJ_SENT", chan);
3357 }
3358 } else {
3359 struct srej_list *l;
3360
3361 /* duplicated tx_seq */
3362 if (l2cap_add_to_srej_queue(chan, skb, tx_seq, sar) < 0)
3363 goto drop;
3364
3365 list_for_each_entry(l, &chan->srej_l, list) {
3366 if (l->tx_seq == tx_seq) {
3367 l2cap_resend_srejframe(chan, tx_seq);
3368 return 0;
3369 }
3370 }
3371 l2cap_send_srejframe(chan, tx_seq);
3372 }
3373 } else {
3374 expected_tx_seq_offset =
3375 (chan->expected_tx_seq - chan->buffer_seq) % 64;
3376 if (expected_tx_seq_offset < 0)
3377 expected_tx_seq_offset += 64;
3378
3379 /* duplicated tx_seq */
3380 if (tx_seq_offset < expected_tx_seq_offset)
3381 goto drop;
3382
3383 chan->conn_state |= L2CAP_CONN_SREJ_SENT;
3384
3385 BT_DBG("chan %p, Enter SREJ", chan);
3386
3387 INIT_LIST_HEAD(&chan->srej_l);
3388 chan->buffer_seq_srej = chan->buffer_seq;
3389
3390 __skb_queue_head_init(&chan->srej_q);
3391 __skb_queue_head_init(&chan->busy_q);
3392 l2cap_add_to_srej_queue(chan, skb, tx_seq, sar);
3393
3394 chan->conn_state |= L2CAP_CONN_SEND_PBIT;
3395
3396 l2cap_send_srejframe(chan, tx_seq);
3397
3398 del_timer(&chan->ack_timer);
3399 }
3400 return 0;
3401
3402 expected:
3403 chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
3404
3405 if (chan->conn_state & L2CAP_CONN_SREJ_SENT) {
3406 bt_cb(skb)->tx_seq = tx_seq;
3407 bt_cb(skb)->sar = sar;
3408 __skb_queue_tail(&chan->srej_q, skb);
3409 return 0;
3410 }
3411
3412 err = l2cap_push_rx_skb(chan, skb, rx_control);
3413 if (err < 0)
3414 return 0;
3415
3416 if (rx_control & L2CAP_CTRL_FINAL) {
3417 if (chan->conn_state & L2CAP_CONN_REJ_ACT)
3418 chan->conn_state &= ~L2CAP_CONN_REJ_ACT;
3419 else
3420 l2cap_retransmit_frames(chan);
3421 }
3422
3423 __mod_ack_timer();
3424
3425 chan->num_acked = (chan->num_acked + 1) % num_to_ack;
3426 if (chan->num_acked == num_to_ack - 1)
3427 l2cap_send_ack(chan);
3428
3429 return 0;
3430
3431 drop:
3432 kfree_skb(skb);
3433 return 0;
3434 }
3435
3436 static inline void l2cap_data_channel_rrframe(struct l2cap_chan *chan, u16 rx_control)
3437 {
3438 BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, __get_reqseq(rx_control),
3439 rx_control);
3440
3441 chan->expected_ack_seq = __get_reqseq(rx_control);
3442 l2cap_drop_acked_frames(chan);
3443
3444 if (rx_control & L2CAP_CTRL_POLL) {
3445 chan->conn_state |= L2CAP_CONN_SEND_FBIT;
3446 if (chan->conn_state & L2CAP_CONN_SREJ_SENT) {
3447 if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3448 (chan->unacked_frames > 0))
3449 __mod_retrans_timer();
3450
3451 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3452 l2cap_send_srejtail(chan);
3453 } else {
3454 l2cap_send_i_or_rr_or_rnr(chan);
3455 }
3456
3457 } else if (rx_control & L2CAP_CTRL_FINAL) {
3458 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3459
3460 if (chan->conn_state & L2CAP_CONN_REJ_ACT)
3461 chan->conn_state &= ~L2CAP_CONN_REJ_ACT;
3462 else
3463 l2cap_retransmit_frames(chan);
3464
3465 } else {
3466 if ((chan->conn_state & L2CAP_CONN_REMOTE_BUSY) &&
3467 (chan->unacked_frames > 0))
3468 __mod_retrans_timer();
3469
3470 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3471 if (chan->conn_state & L2CAP_CONN_SREJ_SENT)
3472 l2cap_send_ack(chan);
3473 else
3474 l2cap_ertm_send(chan);
3475 }
3476 }
3477
3478 static inline void l2cap_data_channel_rejframe(struct l2cap_chan *chan, u16 rx_control)
3479 {
3480 u8 tx_seq = __get_reqseq(rx_control);
3481
3482 BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
3483
3484 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3485
3486 chan->expected_ack_seq = tx_seq;
3487 l2cap_drop_acked_frames(chan);
3488
3489 if (rx_control & L2CAP_CTRL_FINAL) {
3490 if (chan->conn_state & L2CAP_CONN_REJ_ACT)
3491 chan->conn_state &= ~L2CAP_CONN_REJ_ACT;
3492 else
3493 l2cap_retransmit_frames(chan);
3494 } else {
3495 l2cap_retransmit_frames(chan);
3496
3497 if (chan->conn_state & L2CAP_CONN_WAIT_F)
3498 chan->conn_state |= L2CAP_CONN_REJ_ACT;
3499 }
3500 }
3501 static inline void l2cap_data_channel_srejframe(struct l2cap_chan *chan, u16 rx_control)
3502 {
3503 u8 tx_seq = __get_reqseq(rx_control);
3504
3505 BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
3506
3507 chan->conn_state &= ~L2CAP_CONN_REMOTE_BUSY;
3508
3509 if (rx_control & L2CAP_CTRL_POLL) {
3510 chan->expected_ack_seq = tx_seq;
3511 l2cap_drop_acked_frames(chan);
3512
3513 chan->conn_state |= L2CAP_CONN_SEND_FBIT;
3514 l2cap_retransmit_one_frame(chan, tx_seq);
3515
3516 l2cap_ertm_send(chan);
3517
3518 if (chan->conn_state & L2CAP_CONN_WAIT_F) {
3519 chan->srej_save_reqseq = tx_seq;
3520 chan->conn_state |= L2CAP_CONN_SREJ_ACT;
3521 }
3522 } else if (rx_control & L2CAP_CTRL_FINAL) {
3523 if ((chan->conn_state & L2CAP_CONN_SREJ_ACT) &&
3524 chan->srej_save_reqseq == tx_seq)
3525 chan->conn_state &= ~L2CAP_CONN_SREJ_ACT;
3526 else
3527 l2cap_retransmit_one_frame(chan, tx_seq);
3528 } else {
3529 l2cap_retransmit_one_frame(chan, tx_seq);
3530 if (chan->conn_state & L2CAP_CONN_WAIT_F) {
3531 chan->srej_save_reqseq = tx_seq;
3532 chan->conn_state |= L2CAP_CONN_SREJ_ACT;
3533 }
3534 }
3535 }
3536
3537 static inline void l2cap_data_channel_rnrframe(struct l2cap_chan *chan, u16 rx_control)
3538 {
3539 u8 tx_seq = __get_reqseq(rx_control);
3540
3541 BT_DBG("chan %p, req_seq %d ctrl 0x%4.4x", chan, tx_seq, rx_control);
3542
3543 chan->conn_state |= L2CAP_CONN_REMOTE_BUSY;
3544 chan->expected_ack_seq = tx_seq;
3545 l2cap_drop_acked_frames(chan);
3546
3547 if (rx_control & L2CAP_CTRL_POLL)
3548 chan->conn_state |= L2CAP_CONN_SEND_FBIT;
3549
3550 if (!(chan->conn_state & L2CAP_CONN_SREJ_SENT)) {
3551 del_timer(&chan->retrans_timer);
3552 if (rx_control & L2CAP_CTRL_POLL)
3553 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_FINAL);
3554 return;
3555 }
3556
3557 if (rx_control & L2CAP_CTRL_POLL)
3558 l2cap_send_srejtail(chan);
3559 else
3560 l2cap_send_sframe(chan, L2CAP_SUPER_RCV_READY);
3561 }
3562
3563 static inline int l2cap_data_channel_sframe(struct l2cap_chan *chan, u16 rx_control, struct sk_buff *skb)
3564 {
3565 BT_DBG("chan %p rx_control 0x%4.4x len %d", chan, rx_control, skb->len);
3566
3567 if (L2CAP_CTRL_FINAL & rx_control &&
3568 chan->conn_state & L2CAP_CONN_WAIT_F) {
3569 del_timer(&chan->monitor_timer);
3570 if (chan->unacked_frames > 0)
3571 __mod_retrans_timer();
3572 chan->conn_state &= ~L2CAP_CONN_WAIT_F;
3573 }
3574
3575 switch (rx_control & L2CAP_CTRL_SUPERVISE) {
3576 case L2CAP_SUPER_RCV_READY:
3577 l2cap_data_channel_rrframe(chan, rx_control);
3578 break;
3579
3580 case L2CAP_SUPER_REJECT:
3581 l2cap_data_channel_rejframe(chan, rx_control);
3582 break;
3583
3584 case L2CAP_SUPER_SELECT_REJECT:
3585 l2cap_data_channel_srejframe(chan, rx_control);
3586 break;
3587
3588 case L2CAP_SUPER_RCV_NOT_READY:
3589 l2cap_data_channel_rnrframe(chan, rx_control);
3590 break;
3591 }
3592
3593 kfree_skb(skb);
3594 return 0;
3595 }
3596
3597 static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb)
3598 {
3599 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
3600 u16 control;
3601 u8 req_seq;
3602 int len, next_tx_seq_offset, req_seq_offset;
3603
3604 control = get_unaligned_le16(skb->data);
3605 skb_pull(skb, 2);
3606 len = skb->len;
3607
3608 /*
3609 * We can just drop the corrupted I-frame here.
3610 * Receiver will miss it and start proper recovery
3611 * procedures and ask retransmission.
3612 */
3613 if (l2cap_check_fcs(chan, skb))
3614 goto drop;
3615
3616 if (__is_sar_start(control) && __is_iframe(control))
3617 len -= 2;
3618
3619 if (chan->fcs == L2CAP_FCS_CRC16)
3620 len -= 2;
3621
3622 if (len > chan->mps) {
3623 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3624 goto drop;
3625 }
3626
3627 req_seq = __get_reqseq(control);
3628 req_seq_offset = (req_seq - chan->expected_ack_seq) % 64;
3629 if (req_seq_offset < 0)
3630 req_seq_offset += 64;
3631
3632 next_tx_seq_offset =
3633 (chan->next_tx_seq - chan->expected_ack_seq) % 64;
3634 if (next_tx_seq_offset < 0)
3635 next_tx_seq_offset += 64;
3636
3637 /* check for invalid req-seq */
3638 if (req_seq_offset > next_tx_seq_offset) {
3639 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3640 goto drop;
3641 }
3642
3643 if (__is_iframe(control)) {
3644 if (len < 0) {
3645 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3646 goto drop;
3647 }
3648
3649 l2cap_data_channel_iframe(chan, control, skb);
3650 } else {
3651 if (len != 0) {
3652 BT_ERR("%d", len);
3653 l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
3654 goto drop;
3655 }
3656
3657 l2cap_data_channel_sframe(chan, control, skb);
3658 }
3659
3660 return 0;
3661
3662 drop:
3663 kfree_skb(skb);
3664 return 0;
3665 }
3666
3667 static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb)
3668 {
3669 struct l2cap_chan *chan;
3670 struct sock *sk = NULL;
3671 struct l2cap_pinfo *pi;
3672 u16 control;
3673 u8 tx_seq;
3674 int len;
3675
3676 chan = l2cap_get_chan_by_scid(conn, cid);
3677 if (!chan) {
3678 BT_DBG("unknown cid 0x%4.4x", cid);
3679 goto drop;
3680 }
3681
3682 sk = chan->sk;
3683 pi = l2cap_pi(sk);
3684
3685 BT_DBG("chan %p, len %d", chan, skb->len);
3686
3687 if (sk->sk_state != BT_CONNECTED)
3688 goto drop;
3689
3690 switch (chan->mode) {
3691 case L2CAP_MODE_BASIC:
3692 /* If socket recv buffers overflows we drop data here
3693 * which is *bad* because L2CAP has to be reliable.
3694 * But we don't have any other choice. L2CAP doesn't
3695 * provide flow control mechanism. */
3696
3697 if (chan->imtu < skb->len)
3698 goto drop;
3699
3700 if (!sock_queue_rcv_skb(sk, skb))
3701 goto done;
3702 break;
3703
3704 case L2CAP_MODE_ERTM:
3705 if (!sock_owned_by_user(sk)) {
3706 l2cap_ertm_data_rcv(sk, skb);
3707 } else {
3708 if (sk_add_backlog(sk, skb))
3709 goto drop;
3710 }
3711
3712 goto done;
3713
3714 case L2CAP_MODE_STREAMING:
3715 control = get_unaligned_le16(skb->data);
3716 skb_pull(skb, 2);
3717 len = skb->len;
3718
3719 if (l2cap_check_fcs(chan, skb))
3720 goto drop;
3721
3722 if (__is_sar_start(control))
3723 len -= 2;
3724
3725 if (chan->fcs == L2CAP_FCS_CRC16)
3726 len -= 2;
3727
3728 if (len > chan->mps || len < 0 || __is_sframe(control))
3729 goto drop;
3730
3731 tx_seq = __get_txseq(control);
3732
3733 if (chan->expected_tx_seq == tx_seq)
3734 chan->expected_tx_seq = (chan->expected_tx_seq + 1) % 64;
3735 else
3736 chan->expected_tx_seq = (tx_seq + 1) % 64;
3737
3738 l2cap_streaming_reassembly_sdu(chan, skb, control);
3739
3740 goto done;
3741
3742 default:
3743 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
3744 break;
3745 }
3746
3747 drop:
3748 kfree_skb(skb);
3749
3750 done:
3751 if (sk)
3752 bh_unlock_sock(sk);
3753
3754 return 0;
3755 }
3756
3757 static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb)
3758 {
3759 struct sock *sk = NULL;
3760 struct l2cap_chan *chan;
3761
3762 chan = l2cap_global_chan_by_psm(0, psm, conn->src);
3763 if (!chan)
3764 goto drop;
3765
3766 sk = chan->sk;
3767
3768 bh_lock_sock(sk);
3769
3770 BT_DBG("sk %p, len %d", sk, skb->len);
3771
3772 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
3773 goto drop;
3774
3775 if (l2cap_pi(sk)->chan->imtu < skb->len)
3776 goto drop;
3777
3778 if (!sock_queue_rcv_skb(sk, skb))
3779 goto done;
3780
3781 drop:
3782 kfree_skb(skb);
3783
3784 done:
3785 if (sk)
3786 bh_unlock_sock(sk);
3787 return 0;
3788 }
3789
3790 static inline int l2cap_att_channel(struct l2cap_conn *conn, __le16 cid, struct sk_buff *skb)
3791 {
3792 struct sock *sk = NULL;
3793 struct l2cap_chan *chan;
3794
3795 chan = l2cap_global_chan_by_scid(0, cid, conn->src);
3796 if (!chan)
3797 goto drop;
3798
3799 sk = chan->sk;
3800
3801 bh_lock_sock(sk);
3802
3803 BT_DBG("sk %p, len %d", sk, skb->len);
3804
3805 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED)
3806 goto drop;
3807
3808 if (l2cap_pi(sk)->chan->imtu < skb->len)
3809 goto drop;
3810
3811 if (!sock_queue_rcv_skb(sk, skb))
3812 goto done;
3813
3814 drop:
3815 kfree_skb(skb);
3816
3817 done:
3818 if (sk)
3819 bh_unlock_sock(sk);
3820 return 0;
3821 }
3822
3823 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
3824 {
3825 struct l2cap_hdr *lh = (void *) skb->data;
3826 u16 cid, len;
3827 __le16 psm;
3828
3829 skb_pull(skb, L2CAP_HDR_SIZE);
3830 cid = __le16_to_cpu(lh->cid);
3831 len = __le16_to_cpu(lh->len);
3832
3833 if (len != skb->len) {
3834 kfree_skb(skb);
3835 return;
3836 }
3837
3838 BT_DBG("len %d, cid 0x%4.4x", len, cid);
3839
3840 switch (cid) {
3841 case L2CAP_CID_LE_SIGNALING:
3842 case L2CAP_CID_SIGNALING:
3843 l2cap_sig_channel(conn, skb);
3844 break;
3845
3846 case L2CAP_CID_CONN_LESS:
3847 psm = get_unaligned_le16(skb->data);
3848 skb_pull(skb, 2);
3849 l2cap_conless_channel(conn, psm, skb);
3850 break;
3851
3852 case L2CAP_CID_LE_DATA:
3853 l2cap_att_channel(conn, cid, skb);
3854 break;
3855
3856 default:
3857 l2cap_data_channel(conn, cid, skb);
3858 break;
3859 }
3860 }
3861
3862 /* ---- L2CAP interface with lower layer (HCI) ---- */
3863
3864 static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
3865 {
3866 int exact = 0, lm1 = 0, lm2 = 0;
3867 struct l2cap_chan *c;
3868
3869 if (type != ACL_LINK)
3870 return -EINVAL;
3871
3872 BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr));
3873
3874 /* Find listening sockets and check their link_mode */
3875 read_lock(&chan_list_lock);
3876 list_for_each_entry(c, &chan_list, global_l) {
3877 struct sock *sk = c->sk;
3878
3879 if (sk->sk_state != BT_LISTEN)
3880 continue;
3881
3882 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
3883 lm1 |= HCI_LM_ACCEPT;
3884 if (c->role_switch)
3885 lm1 |= HCI_LM_MASTER;
3886 exact++;
3887 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
3888 lm2 |= HCI_LM_ACCEPT;
3889 if (c->role_switch)
3890 lm2 |= HCI_LM_MASTER;
3891 }
3892 }
3893 read_unlock(&chan_list_lock);
3894
3895 return exact ? lm1 : lm2;
3896 }
3897
3898 static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
3899 {
3900 struct l2cap_conn *conn;
3901
3902 BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
3903
3904 if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK))
3905 return -EINVAL;
3906
3907 if (!status) {
3908 conn = l2cap_conn_add(hcon, status);
3909 if (conn)
3910 l2cap_conn_ready(conn);
3911 } else
3912 l2cap_conn_del(hcon, bt_err(status));
3913
3914 return 0;
3915 }
3916
3917 static int l2cap_disconn_ind(struct hci_conn *hcon)
3918 {
3919 struct l2cap_conn *conn = hcon->l2cap_data;
3920
3921 BT_DBG("hcon %p", hcon);
3922
3923 if (hcon->type != ACL_LINK || !conn)
3924 return 0x13;
3925
3926 return conn->disc_reason;
3927 }
3928
3929 static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
3930 {
3931 BT_DBG("hcon %p reason %d", hcon, reason);
3932
3933 if (!(hcon->type == ACL_LINK || hcon->type == LE_LINK))
3934 return -EINVAL;
3935
3936 l2cap_conn_del(hcon, bt_err(reason));
3937
3938 return 0;
3939 }
3940
3941 static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
3942 {
3943 struct sock *sk = chan->sk;
3944
3945 if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM)
3946 return;
3947
3948 if (encrypt == 0x00) {
3949 if (chan->sec_level == BT_SECURITY_MEDIUM) {
3950 l2cap_sock_clear_timer(sk);
3951 l2cap_sock_set_timer(sk, HZ * 5);
3952 } else if (chan->sec_level == BT_SECURITY_HIGH)
3953 __l2cap_sock_close(sk, ECONNREFUSED);
3954 } else {
3955 if (chan->sec_level == BT_SECURITY_MEDIUM)
3956 l2cap_sock_clear_timer(sk);
3957 }
3958 }
3959
3960 static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
3961 {
3962 struct l2cap_conn *conn = hcon->l2cap_data;
3963 struct l2cap_chan *chan;
3964
3965 if (!conn)
3966 return 0;
3967
3968 BT_DBG("conn %p", conn);
3969
3970 read_lock(&conn->chan_lock);
3971
3972 list_for_each_entry(chan, &conn->chan_l, list) {
3973 struct sock *sk = chan->sk;
3974
3975 bh_lock_sock(sk);
3976
3977 if (chan->conf_state & L2CAP_CONF_CONNECT_PEND) {
3978 bh_unlock_sock(sk);
3979 continue;
3980 }
3981
3982 if (!status && (sk->sk_state == BT_CONNECTED ||
3983 sk->sk_state == BT_CONFIG)) {
3984 l2cap_check_encryption(chan, encrypt);
3985 bh_unlock_sock(sk);
3986 continue;
3987 }
3988
3989 if (sk->sk_state == BT_CONNECT) {
3990 if (!status) {
3991 struct l2cap_conn_req req;
3992 req.scid = cpu_to_le16(chan->scid);
3993 req.psm = chan->psm;
3994
3995 chan->ident = l2cap_get_ident(conn);
3996 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
3997
3998 l2cap_send_cmd(conn, chan->ident,
3999 L2CAP_CONN_REQ, sizeof(req), &req);
4000 } else {
4001 l2cap_sock_clear_timer(sk);
4002 l2cap_sock_set_timer(sk, HZ / 10);
4003 }
4004 } else if (sk->sk_state == BT_CONNECT2) {
4005 struct l2cap_conn_rsp rsp;
4006 __u16 res, stat;
4007
4008 if (!status) {
4009 if (bt_sk(sk)->defer_setup) {
4010 struct sock *parent = bt_sk(sk)->parent;
4011 res = L2CAP_CR_PEND;
4012 stat = L2CAP_CS_AUTHOR_PEND;
4013 if (parent)
4014 parent->sk_data_ready(parent, 0);
4015 } else {
4016 sk->sk_state = BT_CONFIG;
4017 res = L2CAP_CR_SUCCESS;
4018 stat = L2CAP_CS_NO_INFO;
4019 }
4020 } else {
4021 sk->sk_state = BT_DISCONN;
4022 l2cap_sock_set_timer(sk, HZ / 10);
4023 res = L2CAP_CR_SEC_BLOCK;
4024 stat = L2CAP_CS_NO_INFO;
4025 }
4026
4027 rsp.scid = cpu_to_le16(chan->dcid);
4028 rsp.dcid = cpu_to_le16(chan->scid);
4029 rsp.result = cpu_to_le16(res);
4030 rsp.status = cpu_to_le16(stat);
4031 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
4032 sizeof(rsp), &rsp);
4033 }
4034
4035 bh_unlock_sock(sk);
4036 }
4037
4038 read_unlock(&conn->chan_lock);
4039
4040 return 0;
4041 }
4042
4043 static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4044 {
4045 struct l2cap_conn *conn = hcon->l2cap_data;
4046
4047 if (!conn)
4048 conn = l2cap_conn_add(hcon, 0);
4049
4050 if (!conn)
4051 goto drop;
4052
4053 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4054
4055 if (!(flags & ACL_CONT)) {
4056 struct l2cap_hdr *hdr;
4057 struct l2cap_chan *chan;
4058 u16 cid;
4059 int len;
4060
4061 if (conn->rx_len) {
4062 BT_ERR("Unexpected start frame (len %d)", skb->len);
4063 kfree_skb(conn->rx_skb);
4064 conn->rx_skb = NULL;
4065 conn->rx_len = 0;
4066 l2cap_conn_unreliable(conn, ECOMM);
4067 }
4068
4069 /* Start fragment always begin with Basic L2CAP header */
4070 if (skb->len < L2CAP_HDR_SIZE) {
4071 BT_ERR("Frame is too short (len %d)", skb->len);
4072 l2cap_conn_unreliable(conn, ECOMM);
4073 goto drop;
4074 }
4075
4076 hdr = (struct l2cap_hdr *) skb->data;
4077 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4078 cid = __le16_to_cpu(hdr->cid);
4079
4080 if (len == skb->len) {
4081 /* Complete frame received */
4082 l2cap_recv_frame(conn, skb);
4083 return 0;
4084 }
4085
4086 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4087
4088 if (skb->len > len) {
4089 BT_ERR("Frame is too long (len %d, expected len %d)",
4090 skb->len, len);
4091 l2cap_conn_unreliable(conn, ECOMM);
4092 goto drop;
4093 }
4094
4095 chan = l2cap_get_chan_by_scid(conn, cid);
4096
4097 if (chan && chan->sk) {
4098 struct sock *sk = chan->sk;
4099
4100 if (chan->imtu < len - L2CAP_HDR_SIZE) {
4101 BT_ERR("Frame exceeding recv MTU (len %d, "
4102 "MTU %d)", len,
4103 chan->imtu);
4104 bh_unlock_sock(sk);
4105 l2cap_conn_unreliable(conn, ECOMM);
4106 goto drop;
4107 }
4108 bh_unlock_sock(sk);
4109 }
4110
4111 /* Allocate skb for the complete frame (with header) */
4112 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4113 if (!conn->rx_skb)
4114 goto drop;
4115
4116 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
4117 skb->len);
4118 conn->rx_len = len - skb->len;
4119 } else {
4120 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4121
4122 if (!conn->rx_len) {
4123 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4124 l2cap_conn_unreliable(conn, ECOMM);
4125 goto drop;
4126 }
4127
4128 if (skb->len > conn->rx_len) {
4129 BT_ERR("Fragment is too long (len %d, expected %d)",
4130 skb->len, conn->rx_len);
4131 kfree_skb(conn->rx_skb);
4132 conn->rx_skb = NULL;
4133 conn->rx_len = 0;
4134 l2cap_conn_unreliable(conn, ECOMM);
4135 goto drop;
4136 }
4137
4138 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
4139 skb->len);
4140 conn->rx_len -= skb->len;
4141
4142 if (!conn->rx_len) {
4143 /* Complete frame received */
4144 l2cap_recv_frame(conn, conn->rx_skb);
4145 conn->rx_skb = NULL;
4146 }
4147 }
4148
4149 drop:
4150 kfree_skb(skb);
4151 return 0;
4152 }
4153
4154 static int l2cap_debugfs_show(struct seq_file *f, void *p)
4155 {
4156 struct l2cap_chan *c;
4157
4158 read_lock_bh(&chan_list_lock);
4159
4160 list_for_each_entry(c, &chan_list, global_l) {
4161 struct sock *sk = c->sk;
4162
4163 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
4164 batostr(&bt_sk(sk)->src),
4165 batostr(&bt_sk(sk)->dst),
4166 sk->sk_state, __le16_to_cpu(c->psm),
4167 c->scid, c->dcid, c->imtu, c->omtu,
4168 c->sec_level, c->mode);
4169 }
4170
4171 read_unlock_bh(&chan_list_lock);
4172
4173 return 0;
4174 }
4175
4176 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4177 {
4178 return single_open(file, l2cap_debugfs_show, inode->i_private);
4179 }
4180
4181 static const struct file_operations l2cap_debugfs_fops = {
4182 .open = l2cap_debugfs_open,
4183 .read = seq_read,
4184 .llseek = seq_lseek,
4185 .release = single_release,
4186 };
4187
4188 static struct dentry *l2cap_debugfs;
4189
4190 static struct hci_proto l2cap_hci_proto = {
4191 .name = "L2CAP",
4192 .id = HCI_PROTO_L2CAP,
4193 .connect_ind = l2cap_connect_ind,
4194 .connect_cfm = l2cap_connect_cfm,
4195 .disconn_ind = l2cap_disconn_ind,
4196 .disconn_cfm = l2cap_disconn_cfm,
4197 .security_cfm = l2cap_security_cfm,
4198 .recv_acldata = l2cap_recv_acldata
4199 };
4200
4201 int __init l2cap_init(void)
4202 {
4203 int err;
4204
4205 err = l2cap_init_sockets();
4206 if (err < 0)
4207 return err;
4208
4209 _busy_wq = create_singlethread_workqueue("l2cap");
4210 if (!_busy_wq) {
4211 err = -ENOMEM;
4212 goto error;
4213 }
4214
4215 err = hci_register_proto(&l2cap_hci_proto);
4216 if (err < 0) {
4217 BT_ERR("L2CAP protocol registration failed");
4218 bt_sock_unregister(BTPROTO_L2CAP);
4219 goto error;
4220 }
4221
4222 if (bt_debugfs) {
4223 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4224 bt_debugfs, NULL, &l2cap_debugfs_fops);
4225 if (!l2cap_debugfs)
4226 BT_ERR("Failed to create L2CAP debug file");
4227 }
4228
4229 return 0;
4230
4231 error:
4232 destroy_workqueue(_busy_wq);
4233 l2cap_cleanup_sockets();
4234 return err;
4235 }
4236
4237 void l2cap_exit(void)
4238 {
4239 debugfs_remove(l2cap_debugfs);
4240
4241 flush_workqueue(_busy_wq);
4242 destroy_workqueue(_busy_wq);
4243
4244 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4245 BT_ERR("L2CAP protocol unregistration failed");
4246
4247 l2cap_cleanup_sockets();
4248 }
4249
4250 module_param(disable_ertm, bool, 0644);
4251 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux with added FPC-III support