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drm/radeon/kms: add new NI pci ids
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / bluetooth / l2cap_core.c
blobebff14c690786ae8e4e0766dfd51cc7e16d3e2ce
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 parent->sk_data_ready(parent, 0);
624
625 } else {
626 sk->sk_state = BT_CONFIG;
627 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
628 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
629 }
630 } else {
631 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
632 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
633 }
634
635 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
636 sizeof(rsp), &rsp);
637
638 if (chan->conf_state & L2CAP_CONF_REQ_SENT ||
639 rsp.result != L2CAP_CR_SUCCESS) {
640 bh_unlock_sock(sk);
641 continue;
642 }
643
644 chan->conf_state |= L2CAP_CONF_REQ_SENT;
645 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
646 l2cap_build_conf_req(chan, buf), buf);
647 chan->num_conf_req++;
648 }
649
650 bh_unlock_sock(sk);
651 }
652
653 read_unlock(&conn->chan_lock);
654 }
655
656 /* Find socket with cid and source bdaddr.
657 * Returns closest match, locked.
658 */
659 static struct l2cap_chan *l2cap_global_chan_by_scid(int state, __le16 cid, bdaddr_t *src)
660 {
661 struct l2cap_chan *c, *c1 = NULL;
662
663 read_lock(&chan_list_lock);
664
665 list_for_each_entry(c, &chan_list, global_l) {
666 struct sock *sk = c->sk;
667
668 if (state && sk->sk_state != state)
669 continue;
670
671 if (c->scid == cid) {
672 /* Exact match. */
673 if (!bacmp(&bt_sk(sk)->src, src)) {
674 read_unlock(&chan_list_lock);
675 return c;
676 }
677
678 /* Closest match */
679 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
680 c1 = c;
681 }
682 }
683
684 read_unlock(&chan_list_lock);
685
686 return c1;
687 }
688
689 static void l2cap_le_conn_ready(struct l2cap_conn *conn)
690 {
691 struct sock *parent, *sk;
692 struct l2cap_chan *chan, *pchan;
693
694 BT_DBG("");
695
696 /* Check if we have socket listening on cid */
697 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_LE_DATA,
698 conn->src);
699 if (!pchan)
700 return;
701
702 parent = pchan->sk;
703
704 bh_lock_sock(parent);
705
706 /* Check for backlog size */
707 if (sk_acceptq_is_full(parent)) {
708 BT_DBG("backlog full %d", parent->sk_ack_backlog);
709 goto clean;
710 }
711
712 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
713 if (!sk)
714 goto clean;
715
716 chan = l2cap_chan_create(sk);
717 if (!chan) {
718 l2cap_sock_kill(sk);
719 goto clean;
720 }
721
722 l2cap_pi(sk)->chan = chan;
723
724 write_lock_bh(&conn->chan_lock);
725
726 hci_conn_hold(conn->hcon);
727
728 l2cap_sock_init(sk, parent);
729
730 bacpy(&bt_sk(sk)->src, conn->src);
731 bacpy(&bt_sk(sk)->dst, conn->dst);
732
733 bt_accept_enqueue(parent, sk);
734
735 __l2cap_chan_add(conn, chan);
736
737 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
738
739 sk->sk_state = BT_CONNECTED;
740 parent->sk_data_ready(parent, 0);
741
742 write_unlock_bh(&conn->chan_lock);
743
744 clean:
745 bh_unlock_sock(parent);
746 }
747
748 static void l2cap_conn_ready(struct l2cap_conn *conn)
749 {
750 struct l2cap_chan *chan;
751
752 BT_DBG("conn %p", conn);
753
754 if (!conn->hcon->out && conn->hcon->type == LE_LINK)
755 l2cap_le_conn_ready(conn);
756
757 read_lock(&conn->chan_lock);
758
759 list_for_each_entry(chan, &conn->chan_l, list) {
760 struct sock *sk = chan->sk;
761
762 bh_lock_sock(sk);
763
764 if (conn->hcon->type == LE_LINK) {
765 l2cap_sock_clear_timer(sk);
766 sk->sk_state = BT_CONNECTED;
767 sk->sk_state_change(sk);
768 }
769
770 if (sk->sk_type != SOCK_SEQPACKET &&
771 sk->sk_type != SOCK_STREAM) {
772 l2cap_sock_clear_timer(sk);
773 sk->sk_state = BT_CONNECTED;
774 sk->sk_state_change(sk);
775 } else if (sk->sk_state == BT_CONNECT)
776 l2cap_do_start(chan);
777
778 bh_unlock_sock(sk);
779 }
780
781 read_unlock(&conn->chan_lock);
782 }
783
784 /* Notify sockets that we cannot guaranty reliability anymore */
785 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
786 {
787 struct l2cap_chan *chan;
788
789 BT_DBG("conn %p", conn);
790
791 read_lock(&conn->chan_lock);
792
793 list_for_each_entry(chan, &conn->chan_l, list) {
794 struct sock *sk = chan->sk;
795
796 if (chan->force_reliable)
797 sk->sk_err = err;
798 }
799
800 read_unlock(&conn->chan_lock);
801 }
802
803 static void l2cap_info_timeout(unsigned long arg)
804 {
805 struct l2cap_conn *conn = (void *) arg;
806
807 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
808 conn->info_ident = 0;
809
810 l2cap_conn_start(conn);
811 }
812
813 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
814 {
815 struct l2cap_conn *conn = hcon->l2cap_data;
816
817 if (conn || status)
818 return conn;
819
820 conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
821 if (!conn)
822 return NULL;
823
824 hcon->l2cap_data = conn;
825 conn->hcon = hcon;
826
827 BT_DBG("hcon %p conn %p", hcon, conn);
828
829 if (hcon->hdev->le_mtu && hcon->type == LE_LINK)
830 conn->mtu = hcon->hdev->le_mtu;
831 else
832 conn->mtu = hcon->hdev->acl_mtu;
833
834 conn->src = &hcon->hdev->bdaddr;
835 conn->dst = &hcon->dst;
836
837 conn->feat_mask = 0;
838
839 spin_lock_init(&conn->lock);
840 rwlock_init(&conn->chan_lock);
841
842 INIT_LIST_HEAD(&conn->chan_l);
843
844 if (hcon->type != LE_LINK)
845 setup_timer(&conn->info_timer, l2cap_info_timeout,
846 (unsigned long) conn);
847
848 conn->disc_reason = 0x13;
849
850 return conn;
851 }
852
853 static void l2cap_conn_del(struct hci_conn *hcon, int err)
854 {
855 struct l2cap_conn *conn = hcon->l2cap_data;
856 struct l2cap_chan *chan, *l;
857 struct sock *sk;
858
859 if (!conn)
860 return;
861
862 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
863
864 kfree_skb(conn->rx_skb);
865
866 /* Kill channels */
867 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
868 sk = chan->sk;
869 bh_lock_sock(sk);
870 l2cap_chan_del(chan, err);
871 bh_unlock_sock(sk);
872 l2cap_sock_kill(sk);
873 }
874
875 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
876 del_timer_sync(&conn->info_timer);
877
878 hcon->l2cap_data = NULL;
879 kfree(conn);
880 }
881
882 static inline void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
883 {
884 write_lock_bh(&conn->chan_lock);
885 __l2cap_chan_add(conn, chan);
886 write_unlock_bh(&conn->chan_lock);
887 }
888
889 /* ---- Socket interface ---- */
890
891 /* Find socket with psm and source bdaddr.
892 * Returns closest match.
893 */
894 static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm, bdaddr_t *src)
895 {
896 struct l2cap_chan *c, *c1 = NULL;
897
898 read_lock(&chan_list_lock);
899
900 list_for_each_entry(c, &chan_list, global_l) {
901 struct sock *sk = c->sk;
902
903 if (state && sk->sk_state != state)
904 continue;
905
906 if (c->psm == psm) {
907 /* Exact match. */
908 if (!bacmp(&bt_sk(sk)->src, src)) {
909 read_unlock(&chan_list_lock);
910 return c;
911 }
912
913 /* Closest match */
914 if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY))
915 c1 = c;
916 }
917 }
918
919 read_unlock(&chan_list_lock);
920
921 return c1;
922 }
923
924 int l2cap_chan_connect(struct l2cap_chan *chan)
925 {
926 struct sock *sk = chan->sk;
927 bdaddr_t *src = &bt_sk(sk)->src;
928 bdaddr_t *dst = &bt_sk(sk)->dst;
929 struct l2cap_conn *conn;
930 struct hci_conn *hcon;
931 struct hci_dev *hdev;
932 __u8 auth_type;
933 int err;
934
935 BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst),
936 chan->psm);
937
938 hdev = hci_get_route(dst, src);
939 if (!hdev)
940 return -EHOSTUNREACH;
941
942 hci_dev_lock_bh(hdev);
943
944 auth_type = l2cap_get_auth_type(chan);
945
946 if (chan->dcid == L2CAP_CID_LE_DATA)
947 hcon = hci_connect(hdev, LE_LINK, dst,
948 chan->sec_level, auth_type);
949 else
950 hcon = hci_connect(hdev, ACL_LINK, dst,
951 chan->sec_level, auth_type);
952
953 if (IS_ERR(hcon)) {
954 err = PTR_ERR(hcon);
955 goto done;
956 }
957
958 conn = l2cap_conn_add(hcon, 0);
959 if (!conn) {
960 hci_conn_put(hcon);
961 err = -ENOMEM;
962 goto done;
963 }
964
965 /* Update source addr of the socket */
966 bacpy(src, conn->src);
967
968 l2cap_chan_add(conn, chan);
969
970 sk->sk_state = BT_CONNECT;
971 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
972
973 if (hcon->state == BT_CONNECTED) {
974 if (sk->sk_type != SOCK_SEQPACKET &&
975 sk->sk_type != SOCK_STREAM) {
976 l2cap_sock_clear_timer(sk);
977 if (l2cap_check_security(chan))
978 sk->sk_state = BT_CONNECTED;
979 } else
980 l2cap_do_start(chan);
981 }
982
983 err = 0;
984
985 done:
986 hci_dev_unlock_bh(hdev);
987 hci_dev_put(hdev);
988 return err;
989 }
990
991 int __l2cap_wait_ack(struct sock *sk)
992 {
993 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
994 DECLARE_WAITQUEUE(wait, current);
995 int err = 0;
996 int timeo = HZ/5;
997
998 add_wait_queue(sk_sleep(sk), &wait);
999 while ((chan->unacked_frames > 0 && chan->conn)) {
1000 set_current_state(TASK_INTERRUPTIBLE);
1001
1002 if (!timeo)
1003 timeo = HZ/5;
1004
1005 if (signal_pending(current)) {
1006 err = sock_intr_errno(timeo);
1007 break;
1008 }
1009
1010 release_sock(sk);
1011 timeo = schedule_timeout(timeo);
1012 lock_sock(sk);
1013
1014 err = sock_error(sk);
1015 if (err)
1016 break;
1017 }
1018 set_current_state(TASK_RUNNING);
1019 remove_wait_queue(sk_sleep(sk), &wait);
1020 return err;
1021 }
1022
1023 static void l2cap_monitor_timeout(unsigned long arg)
1024 {
1025 struct l2cap_chan *chan = (void *) arg;
1026 struct sock *sk = chan->sk;
1027
1028 BT_DBG("chan %p", chan);
1029
1030 bh_lock_sock(sk);
1031 if (chan->retry_count >= chan->remote_max_tx) {
1032 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1033 bh_unlock_sock(sk);
1034 return;
1035 }
1036
1037 chan->retry_count++;
1038 __mod_monitor_timer();
1039
1040 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
1041 bh_unlock_sock(sk);
1042 }
1043
1044 static void l2cap_retrans_timeout(unsigned long arg)
1045 {
1046 struct l2cap_chan *chan = (void *) arg;
1047 struct sock *sk = chan->sk;
1048
1049 BT_DBG("chan %p", chan);
1050
1051 bh_lock_sock(sk);
1052 chan->retry_count = 1;
1053 __mod_monitor_timer();
1054
1055 chan->conn_state |= L2CAP_CONN_WAIT_F;
1056
1057 l2cap_send_rr_or_rnr(chan, L2CAP_CTRL_POLL);
1058 bh_unlock_sock(sk);
1059 }
1060
1061 static void l2cap_drop_acked_frames(struct l2cap_chan *chan)
1062 {
1063 struct sk_buff *skb;
1064
1065 while ((skb = skb_peek(&chan->tx_q)) &&
1066 chan->unacked_frames) {
1067 if (bt_cb(skb)->tx_seq == chan->expected_ack_seq)
1068 break;
1069
1070 skb = skb_dequeue(&chan->tx_q);
1071 kfree_skb(skb);
1072
1073 chan->unacked_frames--;
1074 }
1075
1076 if (!chan->unacked_frames)
1077 del_timer(&chan->retrans_timer);
1078 }
1079
1080 void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
1081 {
1082 struct hci_conn *hcon = chan->conn->hcon;
1083 u16 flags;
1084
1085 BT_DBG("chan %p, skb %p len %d", chan, skb, skb->len);
1086
1087 if (!chan->flushable && lmp_no_flush_capable(hcon->hdev))
1088 flags = ACL_START_NO_FLUSH;
1089 else
1090 flags = ACL_START;
1091
1092 hci_send_acl(hcon, skb, flags);
1093 }
1094
1095 void l2cap_streaming_send(struct l2cap_chan *chan)
1096 {
1097 struct sk_buff *skb;
1098 u16 control, fcs;
1099
1100 while ((skb = skb_dequeue(&chan->tx_q))) {
1101 control = get_unaligned_le16(skb->data + L2CAP_HDR_SIZE);
1102 control |= chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT;
1103 put_unaligned_le16(control, skb->data + L2CAP_HDR_SIZE);
1104
1105 if (chan->fcs == L2CAP_FCS_CRC16) {
1106 fcs = crc16(0, (u8 *)skb->data, skb->len - 2);
1107 put_unaligned_le16(fcs, skb->data + skb->len - 2);
1108 }
1109
1110 l2cap_do_send(chan, skb);
1111
1112 chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
1113 }
1114 }
1115
1116 static void l2cap_retransmit_one_frame(struct l2cap_chan *chan, u8 tx_seq)
1117 {
1118 struct sk_buff *skb, *tx_skb;
1119 u16 control, fcs;
1120
1121 skb = skb_peek(&chan->tx_q);
1122 if (!skb)
1123 return;
1124
1125 do {
1126 if (bt_cb(skb)->tx_seq == tx_seq)
1127 break;
1128
1129 if (skb_queue_is_last(&chan->tx_q, skb))
1130 return;
1131
1132 } while ((skb = skb_queue_next(&chan->tx_q, skb)));
1133
1134 if (chan->remote_max_tx &&
1135 bt_cb(skb)->retries == chan->remote_max_tx) {
1136 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1137 return;
1138 }
1139
1140 tx_skb = skb_clone(skb, GFP_ATOMIC);
1141 bt_cb(skb)->retries++;
1142 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1143 control &= L2CAP_CTRL_SAR;
1144
1145 if (chan->conn_state & L2CAP_CONN_SEND_FBIT) {
1146 control |= L2CAP_CTRL_FINAL;
1147 chan->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1148 }
1149
1150 control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1151 | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1152
1153 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1154
1155 if (chan->fcs == L2CAP_FCS_CRC16) {
1156 fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2);
1157 put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2);
1158 }
1159
1160 l2cap_do_send(chan, tx_skb);
1161 }
1162
1163 int l2cap_ertm_send(struct l2cap_chan *chan)
1164 {
1165 struct sk_buff *skb, *tx_skb;
1166 struct sock *sk = chan->sk;
1167 u16 control, fcs;
1168 int nsent = 0;
1169
1170 if (sk->sk_state != BT_CONNECTED)
1171 return -ENOTCONN;
1172
1173 while ((skb = chan->tx_send_head) && (!l2cap_tx_window_full(chan))) {
1174
1175 if (chan->remote_max_tx &&
1176 bt_cb(skb)->retries == chan->remote_max_tx) {
1177 l2cap_send_disconn_req(chan->conn, chan, ECONNABORTED);
1178 break;
1179 }
1180
1181 tx_skb = skb_clone(skb, GFP_ATOMIC);
1182
1183 bt_cb(skb)->retries++;
1184
1185 control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE);
1186 control &= L2CAP_CTRL_SAR;
1187
1188 if (chan->conn_state & L2CAP_CONN_SEND_FBIT) {
1189 control |= L2CAP_CTRL_FINAL;
1190 chan->conn_state &= ~L2CAP_CONN_SEND_FBIT;
1191 }
1192 control |= (chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT)
1193 | (chan->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT);
1194 put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE);
1195
1196
1197 if (chan->fcs == L2CAP_FCS_CRC16) {
1198 fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2);
1199 put_unaligned_le16(fcs, skb->data + tx_skb->len - 2);
1200 }
1201
1202 l2cap_do_send(chan, tx_skb);
1203
1204 __mod_retrans_timer();
1205
1206 bt_cb(skb)->tx_seq = chan->next_tx_seq;
1207 chan->next_tx_seq = (chan->next_tx_seq + 1) % 64;
1208
1209 if (bt_cb(skb)->retries == 1)
1210 chan->unacked_frames++;
1211
1212 chan->frames_sent++;
1213
1214 if (skb_queue_is_last(&chan->tx_q, skb))
1215 chan->tx_send_head = NULL;
1216 else
1217 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
1218
1219 nsent++;
1220 }
1221
1222 return nsent;
1223 }
1224
1225 static int l2cap_retransmit_frames(struct l2cap_chan *chan)
1226 {
1227 int ret;
1228
1229 if (!skb_queue_empty(&chan->tx_q))
1230 chan->tx_send_head = chan->tx_q.next;
1231
1232 chan->next_tx_seq = chan->expected_ack_seq;
1233 ret = l2cap_ertm_send(chan);
1234 return ret;
1235 }
1236
1237 static void l2cap_send_ack(struct l2cap_chan *chan)
1238 {
1239 u16 control = 0;
1240
1241 control |= chan->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1242
1243 if (chan->conn_state & L2CAP_CONN_LOCAL_BUSY) {
1244 control |= L2CAP_SUPER_RCV_NOT_READY;
1245 chan->conn_state |= L2CAP_CONN_RNR_SENT;
1246 l2cap_send_sframe(chan, control);
1247 return;
1248 }
1249
1250 if (l2cap_ertm_send(chan) > 0)
1251 return;
1252
1253 control |= L2CAP_SUPER_RCV_READY;
1254 l2cap_send_sframe(chan, control);
1255 }
1256
1257 static void l2cap_send_srejtail(struct l2cap_chan *chan)
1258 {
1259 struct srej_list *tail;
1260 u16 control;
1261
1262 control = L2CAP_SUPER_SELECT_REJECT;
1263 control |= L2CAP_CTRL_FINAL;
1264
1265 tail = list_entry((&chan->srej_l)->prev, struct srej_list, list);
1266 control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT;
1267
1268 l2cap_send_sframe(chan, control);
1269 }
1270
1271 static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb)
1272 {
1273 struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn;
1274 struct sk_buff **frag;
1275 int err, sent = 0;
1276
1277 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
1278 return -EFAULT;
1279
1280 sent += count;
1281 len -= count;
1282
1283 /* Continuation fragments (no L2CAP header) */
1284 frag = &skb_shinfo(skb)->frag_list;
1285 while (len) {
1286 count = min_t(unsigned int, conn->mtu, len);
1287
1288 *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err);
1289 if (!*frag)
1290 return err;
1291 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
1292 return -EFAULT;
1293
1294 sent += count;
1295 len -= count;
1296
1297 frag = &(*frag)->next;
1298 }
1299
1300 return sent;
1301 }
1302
1303 struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1304 {
1305 struct sock *sk = chan->sk;
1306 struct l2cap_conn *conn = chan->conn;
1307 struct sk_buff *skb;
1308 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1309 struct l2cap_hdr *lh;
1310
1311 BT_DBG("sk %p len %d", sk, (int)len);
1312
1313 count = min_t(unsigned int, (conn->mtu - hlen), len);
1314 skb = bt_skb_send_alloc(sk, count + hlen,
1315 msg->msg_flags & MSG_DONTWAIT, &err);
1316 if (!skb)
1317 return ERR_PTR(err);
1318
1319 /* Create L2CAP header */
1320 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1321 lh->cid = cpu_to_le16(chan->dcid);
1322 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1323 put_unaligned_le16(chan->psm, skb_put(skb, 2));
1324
1325 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1326 if (unlikely(err < 0)) {
1327 kfree_skb(skb);
1328 return ERR_PTR(err);
1329 }
1330 return skb;
1331 }
1332
1333 struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1334 {
1335 struct sock *sk = chan->sk;
1336 struct l2cap_conn *conn = chan->conn;
1337 struct sk_buff *skb;
1338 int err, count, hlen = L2CAP_HDR_SIZE;
1339 struct l2cap_hdr *lh;
1340
1341 BT_DBG("sk %p len %d", sk, (int)len);
1342
1343 count = min_t(unsigned int, (conn->mtu - hlen), len);
1344 skb = bt_skb_send_alloc(sk, count + hlen,
1345 msg->msg_flags & MSG_DONTWAIT, &err);
1346 if (!skb)
1347 return ERR_PTR(err);
1348
1349 /* Create L2CAP header */
1350 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1351 lh->cid = cpu_to_le16(chan->dcid);
1352 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1353
1354 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1355 if (unlikely(err < 0)) {
1356 kfree_skb(skb);
1357 return ERR_PTR(err);
1358 }
1359 return skb;
1360 }
1361
1362 struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len, u16 control, u16 sdulen)
1363 {
1364 struct sock *sk = chan->sk;
1365 struct l2cap_conn *conn = chan->conn;
1366 struct sk_buff *skb;
1367 int err, count, hlen = L2CAP_HDR_SIZE + 2;
1368 struct l2cap_hdr *lh;
1369
1370 BT_DBG("sk %p len %d", sk, (int)len);
1371
1372 if (!conn)
1373 return ERR_PTR(-ENOTCONN);
1374
1375 if (sdulen)
1376 hlen += 2;
1377
1378 if (chan->fcs == L2CAP_FCS_CRC16)
1379 hlen += 2;
1380
1381 count = min_t(unsigned int, (conn->mtu - hlen), len);
1382 skb = bt_skb_send_alloc(sk, count + hlen,
1383 msg->msg_flags & MSG_DONTWAIT, &err);
1384 if (!skb)
1385 return ERR_PTR(err);
1386
1387 /* Create L2CAP header */
1388 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1389 lh->cid = cpu_to_le16(chan->dcid);
1390 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
1391 put_unaligned_le16(control, skb_put(skb, 2));
1392 if (sdulen)
1393 put_unaligned_le16(sdulen, skb_put(skb, 2));
1394
1395 err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb);
1396 if (unlikely(err < 0)) {
1397 kfree_skb(skb);
1398 return ERR_PTR(err);
1399 }
1400
1401 if (chan->fcs == L2CAP_FCS_CRC16)
1402 put_unaligned_le16(0, skb_put(skb, 2));
1403
1404 bt_cb(skb)->retries = 0;
1405 return skb;
1406 }
1407
1408 int l2cap_sar_segment_sdu(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
1409 {
1410 struct sk_buff *skb;
1411 struct sk_buff_head sar_queue;
1412 u16 control;
1413 size_t size = 0;
1414
1415 skb_queue_head_init(&sar_queue);
1416 control = L2CAP_SDU_START;
1417 skb = l2cap_create_iframe_pdu(chan, msg, chan->remote_mps, control, len);
1418 if (IS_ERR(skb))
1419 return PTR_ERR(skb);
1420
1421 __skb_queue_tail(&sar_queue, skb);
1422 len -= chan->remote_mps;
1423 size += chan->remote_mps;
1424
1425 while (len > 0) {
1426 size_t buflen;
1427
1428 if (len > chan->remote_mps) {
1429 control = L2CAP_SDU_CONTINUE;
1430 buflen = chan->remote_mps;
1431 } else {
1432 control = L2CAP_SDU_END;
1433 buflen = len;
1434 }
1435
1436 skb = l2cap_create_iframe_pdu(chan, msg, buflen, control, 0);
1437 if (IS_ERR(skb)) {
1438 skb_queue_purge(&sar_queue);
1439 return PTR_ERR(skb);
1440 }
1441
1442 __skb_queue_tail(&sar_queue, skb);
1443 len -= buflen;
1444 size += buflen;
1445 }
1446 skb_queue_splice_tail(&sar_queue, &chan->tx_q);
1447 if (chan->tx_send_head == NULL)
1448 chan->tx_send_head = sar_queue.next;
1449
1450 return size;
1451 }
1452
1453 static void l2cap_chan_ready(struct sock *sk)
1454 {
1455 struct sock *parent = bt_sk(sk)->parent;
1456 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1457
1458 BT_DBG("sk %p, parent %p", sk, parent);
1459
1460 chan->conf_state = 0;
1461 l2cap_sock_clear_timer(sk);
1462
1463 if (!parent) {
1464 /* Outgoing channel.
1465 * Wake up socket sleeping on connect.
1466 */
1467 sk->sk_state = BT_CONNECTED;
1468 sk->sk_state_change(sk);
1469 } else {
1470 /* Incoming channel.
1471 * Wake up socket sleeping on accept.
1472 */
1473 parent->sk_data_ready(parent, 0);
1474 }
1475 }
1476
1477 /* Copy frame to all raw sockets on that connection */
1478 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
1479 {
1480 struct sk_buff *nskb;
1481 struct l2cap_chan *chan;
1482
1483 BT_DBG("conn %p", conn);
1484
1485 read_lock(&conn->chan_lock);
1486 list_for_each_entry(chan, &conn->chan_l, list) {
1487 struct sock *sk = chan->sk;
1488 if (sk->sk_type != SOCK_RAW)
1489 continue;
1490
1491 /* Don't send frame to the socket it came from */
1492 if (skb->sk == sk)
1493 continue;
1494 nskb = skb_clone(skb, GFP_ATOMIC);
1495 if (!nskb)
1496 continue;
1497
1498 if (sock_queue_rcv_skb(sk, nskb))
1499 kfree_skb(nskb);
1500 }
1501 read_unlock(&conn->chan_lock);
1502 }
1503
1504 /* ---- L2CAP signalling commands ---- */
1505 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
1506 u8 code, u8 ident, u16 dlen, void *data)
1507 {
1508 struct sk_buff *skb, **frag;
1509 struct l2cap_cmd_hdr *cmd;
1510 struct l2cap_hdr *lh;
1511 int len, count;
1512
1513 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d",
1514 conn, code, ident, dlen);
1515
1516 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
1517 count = min_t(unsigned int, conn->mtu, len);
1518
1519 skb = bt_skb_alloc(count, GFP_ATOMIC);
1520 if (!skb)
1521 return NULL;
1522
1523 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1524 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
1525
1526 if (conn->hcon->type == LE_LINK)
1527 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
1528 else
1529 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
1530
1531 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
1532 cmd->code = code;
1533 cmd->ident = ident;
1534 cmd->len = cpu_to_le16(dlen);
1535
1536 if (dlen) {
1537 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
1538 memcpy(skb_put(skb, count), data, count);
1539 data += count;
1540 }
1541
1542 len -= skb->len;
1543
1544 /* Continuation fragments (no L2CAP header) */
1545 frag = &skb_shinfo(skb)->frag_list;
1546 while (len) {
1547 count = min_t(unsigned int, conn->mtu, len);
1548
1549 *frag = bt_skb_alloc(count, GFP_ATOMIC);
1550 if (!*frag)
1551 goto fail;
1552
1553 memcpy(skb_put(*frag, count), data, count);
1554
1555 len -= count;
1556 data += count;
1557
1558 frag = &(*frag)->next;
1559 }
1560
1561 return skb;
1562
1563 fail:
1564 kfree_skb(skb);
1565 return NULL;
1566 }
1567
1568 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val)
1569 {
1570 struct l2cap_conf_opt *opt = *ptr;
1571 int len;
1572
1573 len = L2CAP_CONF_OPT_SIZE + opt->len;
1574 *ptr += len;
1575
1576 *type = opt->type;
1577 *olen = opt->len;
1578
1579 switch (opt->len) {
1580 case 1:
1581 *val = *((u8 *) opt->val);
1582 break;
1583
1584 case 2:
1585 *val = get_unaligned_le16(opt->val);
1586 break;
1587
1588 case 4:
1589 *val = get_unaligned_le32(opt->val);
1590 break;
1591
1592 default:
1593 *val = (unsigned long) opt->val;
1594 break;
1595 }
1596
1597 BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val);
1598 return len;
1599 }
1600
1601 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
1602 {
1603 struct l2cap_conf_opt *opt = *ptr;
1604
1605 BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val);
1606
1607 opt->type = type;
1608 opt->len = len;
1609
1610 switch (len) {
1611 case 1:
1612 *((u8 *) opt->val) = val;
1613 break;
1614
1615 case 2:
1616 put_unaligned_le16(val, opt->val);
1617 break;
1618
1619 case 4:
1620 put_unaligned_le32(val, opt->val);
1621 break;
1622
1623 default:
1624 memcpy(opt->val, (void *) val, len);
1625 break;
1626 }
1627
1628 *ptr += L2CAP_CONF_OPT_SIZE + len;
1629 }
1630
1631 static void l2cap_ack_timeout(unsigned long arg)
1632 {
1633 struct l2cap_chan *chan = (void *) arg;
1634
1635 bh_lock_sock(chan->sk);
1636 l2cap_send_ack(chan);
1637 bh_unlock_sock(chan->sk);
1638 }
1639
1640 static inline void l2cap_ertm_init(struct l2cap_chan *chan)
1641 {
1642 struct sock *sk = chan->sk;
1643
1644 chan->expected_ack_seq = 0;
1645 chan->unacked_frames = 0;
1646 chan->buffer_seq = 0;
1647 chan->num_acked = 0;
1648 chan->frames_sent = 0;
1649
1650 setup_timer(&chan->retrans_timer, l2cap_retrans_timeout,
1651 (unsigned long) chan);
1652 setup_timer(&chan->monitor_timer, l2cap_monitor_timeout,
1653 (unsigned long) chan);
1654 setup_timer(&chan->ack_timer, l2cap_ack_timeout, (unsigned long) chan);
1655
1656 skb_queue_head_init(&chan->srej_q);
1657 skb_queue_head_init(&chan->busy_q);
1658
1659 INIT_LIST_HEAD(&chan->srej_l);
1660
1661 INIT_WORK(&chan->busy_work, l2cap_busy_work);
1662
1663 sk->sk_backlog_rcv = l2cap_ertm_data_rcv;
1664 }
1665
1666 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
1667 {
1668 switch (mode) {
1669 case L2CAP_MODE_STREAMING:
1670 case L2CAP_MODE_ERTM:
1671 if (l2cap_mode_supported(mode, remote_feat_mask))
1672 return mode;
1673 /* fall through */
1674 default:
1675 return L2CAP_MODE_BASIC;
1676 }
1677 }
1678
1679 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
1680 {
1681 struct l2cap_conf_req *req = data;
1682 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
1683 void *ptr = req->data;
1684
1685 BT_DBG("chan %p", chan);
1686
1687 if (chan->num_conf_req || chan->num_conf_rsp)
1688 goto done;
1689
1690 switch (chan->mode) {
1691 case L2CAP_MODE_STREAMING:
1692 case L2CAP_MODE_ERTM:
1693 if (chan->conf_state & L2CAP_CONF_STATE2_DEVICE)
1694 break;
1695
1696 /* fall through */
1697 default:
1698 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
1699 break;
1700 }
1701
1702 done:
1703 if (chan->imtu != L2CAP_DEFAULT_MTU)
1704 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
1705
1706 switch (chan->mode) {
1707 case L2CAP_MODE_BASIC:
1708 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
1709 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
1710 break;
1711
1712 rfc.mode = L2CAP_MODE_BASIC;
1713 rfc.txwin_size = 0;
1714 rfc.max_transmit = 0;
1715 rfc.retrans_timeout = 0;
1716 rfc.monitor_timeout = 0;
1717 rfc.max_pdu_size = 0;
1718
1719 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1720 (unsigned long) &rfc);
1721 break;
1722
1723 case L2CAP_MODE_ERTM:
1724 rfc.mode = L2CAP_MODE_ERTM;
1725 rfc.txwin_size = chan->tx_win;
1726 rfc.max_transmit = chan->max_tx;
1727 rfc.retrans_timeout = 0;
1728 rfc.monitor_timeout = 0;
1729 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
1730 if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
1731 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1732
1733 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1734 (unsigned long) &rfc);
1735
1736 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
1737 break;
1738
1739 if (chan->fcs == L2CAP_FCS_NONE ||
1740 chan->conf_state & L2CAP_CONF_NO_FCS_RECV) {
1741 chan->fcs = L2CAP_FCS_NONE;
1742 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
1743 }
1744 break;
1745
1746 case L2CAP_MODE_STREAMING:
1747 rfc.mode = L2CAP_MODE_STREAMING;
1748 rfc.txwin_size = 0;
1749 rfc.max_transmit = 0;
1750 rfc.retrans_timeout = 0;
1751 rfc.monitor_timeout = 0;
1752 rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE);
1753 if (L2CAP_DEFAULT_MAX_PDU_SIZE > chan->conn->mtu - 10)
1754 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1755
1756 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
1757 (unsigned long) &rfc);
1758
1759 if (!(chan->conn->feat_mask & L2CAP_FEAT_FCS))
1760 break;
1761
1762 if (chan->fcs == L2CAP_FCS_NONE ||
1763 chan->conf_state & L2CAP_CONF_NO_FCS_RECV) {
1764 chan->fcs = L2CAP_FCS_NONE;
1765 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, chan->fcs);
1766 }
1767 break;
1768 }
1769
1770 req->dcid = cpu_to_le16(chan->dcid);
1771 req->flags = cpu_to_le16(0);
1772
1773 return ptr - data;
1774 }
1775
1776 static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
1777 {
1778 struct l2cap_conf_rsp *rsp = data;
1779 void *ptr = rsp->data;
1780 void *req = chan->conf_req;
1781 int len = chan->conf_len;
1782 int type, hint, olen;
1783 unsigned long val;
1784 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
1785 u16 mtu = L2CAP_DEFAULT_MTU;
1786 u16 result = L2CAP_CONF_SUCCESS;
1787
1788 BT_DBG("chan %p", chan);
1789
1790 while (len >= L2CAP_CONF_OPT_SIZE) {
1791 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
1792
1793 hint = type & L2CAP_CONF_HINT;
1794 type &= L2CAP_CONF_MASK;
1795
1796 switch (type) {
1797 case L2CAP_CONF_MTU:
1798 mtu = val;
1799 break;
1800
1801 case L2CAP_CONF_FLUSH_TO:
1802 chan->flush_to = val;
1803 break;
1804
1805 case L2CAP_CONF_QOS:
1806 break;
1807
1808 case L2CAP_CONF_RFC:
1809 if (olen == sizeof(rfc))
1810 memcpy(&rfc, (void *) val, olen);
1811 break;
1812
1813 case L2CAP_CONF_FCS:
1814 if (val == L2CAP_FCS_NONE)
1815 chan->conf_state |= L2CAP_CONF_NO_FCS_RECV;
1816
1817 break;
1818
1819 default:
1820 if (hint)
1821 break;
1822
1823 result = L2CAP_CONF_UNKNOWN;
1824 *((u8 *) ptr++) = type;
1825 break;
1826 }
1827 }
1828
1829 if (chan->num_conf_rsp || chan->num_conf_req > 1)
1830 goto done;
1831
1832 switch (chan->mode) {
1833 case L2CAP_MODE_STREAMING:
1834 case L2CAP_MODE_ERTM:
1835 if (!(chan->conf_state & L2CAP_CONF_STATE2_DEVICE)) {
1836 chan->mode = l2cap_select_mode(rfc.mode,
1837 chan->conn->feat_mask);
1838 break;
1839 }
1840
1841 if (chan->mode != rfc.mode)
1842 return -ECONNREFUSED;
1843
1844 break;
1845 }
1846
1847 done:
1848 if (chan->mode != rfc.mode) {
1849 result = L2CAP_CONF_UNACCEPT;
1850 rfc.mode = chan->mode;
1851
1852 if (chan->num_conf_rsp == 1)
1853 return -ECONNREFUSED;
1854
1855 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
1856 sizeof(rfc), (unsigned long) &rfc);
1857 }
1858
1859
1860 if (result == L2CAP_CONF_SUCCESS) {
1861 /* Configure output options and let the other side know
1862 * which ones we don't like. */
1863
1864 if (mtu < L2CAP_DEFAULT_MIN_MTU)
1865 result = L2CAP_CONF_UNACCEPT;
1866 else {
1867 chan->omtu = mtu;
1868 chan->conf_state |= L2CAP_CONF_MTU_DONE;
1869 }
1870 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
1871
1872 switch (rfc.mode) {
1873 case L2CAP_MODE_BASIC:
1874 chan->fcs = L2CAP_FCS_NONE;
1875 chan->conf_state |= L2CAP_CONF_MODE_DONE;
1876 break;
1877
1878 case L2CAP_MODE_ERTM:
1879 chan->remote_tx_win = rfc.txwin_size;
1880 chan->remote_max_tx = rfc.max_transmit;
1881
1882 if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
1883 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1884
1885 chan->remote_mps = le16_to_cpu(rfc.max_pdu_size);
1886
1887 rfc.retrans_timeout =
1888 le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO);
1889 rfc.monitor_timeout =
1890 le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO);
1891
1892 chan->conf_state |= L2CAP_CONF_MODE_DONE;
1893
1894 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
1895 sizeof(rfc), (unsigned long) &rfc);
1896
1897 break;
1898
1899 case L2CAP_MODE_STREAMING:
1900 if (le16_to_cpu(rfc.max_pdu_size) > chan->conn->mtu - 10)
1901 rfc.max_pdu_size = cpu_to_le16(chan->conn->mtu - 10);
1902
1903 chan->remote_mps = le16_to_cpu(rfc.max_pdu_size);
1904
1905 chan->conf_state |= L2CAP_CONF_MODE_DONE;
1906
1907 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
1908 sizeof(rfc), (unsigned long) &rfc);
1909
1910 break;
1911
1912 default:
1913 result = L2CAP_CONF_UNACCEPT;
1914
1915 memset(&rfc, 0, sizeof(rfc));
1916 rfc.mode = chan->mode;
1917 }
1918
1919 if (result == L2CAP_CONF_SUCCESS)
1920 chan->conf_state |= L2CAP_CONF_OUTPUT_DONE;
1921 }
1922 rsp->scid = cpu_to_le16(chan->dcid);
1923 rsp->result = cpu_to_le16(result);
1924 rsp->flags = cpu_to_le16(0x0000);
1925
1926 return ptr - data;
1927 }
1928
1929 static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len, void *data, u16 *result)
1930 {
1931 struct l2cap_conf_req *req = data;
1932 void *ptr = req->data;
1933 int type, olen;
1934 unsigned long val;
1935 struct l2cap_conf_rfc rfc;
1936
1937 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
1938
1939 while (len >= L2CAP_CONF_OPT_SIZE) {
1940 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
1941
1942 switch (type) {
1943 case L2CAP_CONF_MTU:
1944 if (val < L2CAP_DEFAULT_MIN_MTU) {
1945 *result = L2CAP_CONF_UNACCEPT;
1946 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
1947 } else
1948 chan->imtu = val;
1949 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
1950 break;
1951
1952 case L2CAP_CONF_FLUSH_TO:
1953 chan->flush_to = val;
1954 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
1955 2, chan->flush_to);
1956 break;
1957
1958 case L2CAP_CONF_RFC:
1959 if (olen == sizeof(rfc))
1960 memcpy(&rfc, (void *)val, olen);
1961
1962 if ((chan->conf_state & L2CAP_CONF_STATE2_DEVICE) &&
1963 rfc.mode != chan->mode)
1964 return -ECONNREFUSED;
1965
1966 chan->fcs = 0;
1967
1968 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
1969 sizeof(rfc), (unsigned long) &rfc);
1970 break;
1971 }
1972 }
1973
1974 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
1975 return -ECONNREFUSED;
1976
1977 chan->mode = rfc.mode;
1978
1979 if (*result == L2CAP_CONF_SUCCESS) {
1980 switch (rfc.mode) {
1981 case L2CAP_MODE_ERTM:
1982 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
1983 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
1984 chan->mps = le16_to_cpu(rfc.max_pdu_size);
1985 break;
1986 case L2CAP_MODE_STREAMING:
1987 chan->mps = le16_to_cpu(rfc.max_pdu_size);
1988 }
1989 }
1990
1991 req->dcid = cpu_to_le16(chan->dcid);
1992 req->flags = cpu_to_le16(0x0000);
1993
1994 return ptr - data;
1995 }
1996
1997 static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data, u16 result, u16 flags)
1998 {
1999 struct l2cap_conf_rsp *rsp = data;
2000 void *ptr = rsp->data;
2001
2002 BT_DBG("chan %p", chan);
2003
2004 rsp->scid = cpu_to_le16(chan->dcid);
2005 rsp->result = cpu_to_le16(result);
2006 rsp->flags = cpu_to_le16(flags);
2007
2008 return ptr - data;
2009 }
2010
2011 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
2012 {
2013 struct l2cap_conn_rsp rsp;
2014 struct l2cap_conn *conn = chan->conn;
2015 u8 buf[128];
2016
2017 rsp.scid = cpu_to_le16(chan->dcid);
2018 rsp.dcid = cpu_to_le16(chan->scid);
2019 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
2020 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
2021 l2cap_send_cmd(conn, chan->ident,
2022 L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2023
2024 if (chan->conf_state & L2CAP_CONF_REQ_SENT)
2025 return;
2026
2027 chan->conf_state |= L2CAP_CONF_REQ_SENT;
2028 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2029 l2cap_build_conf_req(chan, buf), buf);
2030 chan->num_conf_req++;
2031 }
2032
2033 static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
2034 {
2035 int type, olen;
2036 unsigned long val;
2037 struct l2cap_conf_rfc rfc;
2038
2039 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
2040
2041 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
2042 return;
2043
2044 while (len >= L2CAP_CONF_OPT_SIZE) {
2045 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
2046
2047 switch (type) {
2048 case L2CAP_CONF_RFC:
2049 if (olen == sizeof(rfc))
2050 memcpy(&rfc, (void *)val, olen);
2051 goto done;
2052 }
2053 }
2054
2055 done:
2056 switch (rfc.mode) {
2057 case L2CAP_MODE_ERTM:
2058 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
2059 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
2060 chan->mps = le16_to_cpu(rfc.max_pdu_size);
2061 break;
2062 case L2CAP_MODE_STREAMING:
2063 chan->mps = le16_to_cpu(rfc.max_pdu_size);
2064 }
2065 }
2066
2067 static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2068 {
2069 struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data;
2070
2071 if (rej->reason != 0x0000)
2072 return 0;
2073
2074 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
2075 cmd->ident == conn->info_ident) {
2076 del_timer(&conn->info_timer);
2077
2078 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
2079 conn->info_ident = 0;
2080
2081 l2cap_conn_start(conn);
2082 }
2083
2084 return 0;
2085 }
2086
2087 static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2088 {
2089 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
2090 struct l2cap_conn_rsp rsp;
2091 struct l2cap_chan *chan = NULL, *pchan;
2092 struct sock *parent, *sk = NULL;
2093 int result, status = L2CAP_CS_NO_INFO;
2094
2095 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
2096 __le16 psm = req->psm;
2097
2098 BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid);
2099
2100 /* Check if we have socket listening on psm */
2101 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src);
2102 if (!pchan) {
2103 result = L2CAP_CR_BAD_PSM;
2104 goto sendresp;
2105 }
2106
2107 parent = pchan->sk;
2108
2109 bh_lock_sock(parent);
2110
2111 /* Check if the ACL is secure enough (if not SDP) */
2112 if (psm != cpu_to_le16(0x0001) &&
2113 !hci_conn_check_link_mode(conn->hcon)) {
2114 conn->disc_reason = 0x05;
2115 result = L2CAP_CR_SEC_BLOCK;
2116 goto response;
2117 }
2118
2119 result = L2CAP_CR_NO_MEM;
2120
2121 /* Check for backlog size */
2122 if (sk_acceptq_is_full(parent)) {
2123 BT_DBG("backlog full %d", parent->sk_ack_backlog);
2124 goto response;
2125 }
2126
2127 sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC);
2128 if (!sk)
2129 goto response;
2130
2131 chan = l2cap_chan_create(sk);
2132 if (!chan) {
2133 l2cap_sock_kill(sk);
2134 goto response;
2135 }
2136
2137 l2cap_pi(sk)->chan = chan;
2138
2139 write_lock_bh(&conn->chan_lock);
2140
2141 /* Check if we already have channel with that dcid */
2142 if (__l2cap_get_chan_by_dcid(conn, scid)) {
2143 write_unlock_bh(&conn->chan_lock);
2144 sock_set_flag(sk, SOCK_ZAPPED);
2145 l2cap_sock_kill(sk);
2146 goto response;
2147 }
2148
2149 hci_conn_hold(conn->hcon);
2150
2151 l2cap_sock_init(sk, parent);
2152 bacpy(&bt_sk(sk)->src, conn->src);
2153 bacpy(&bt_sk(sk)->dst, conn->dst);
2154 chan->psm = psm;
2155 chan->dcid = scid;
2156
2157 bt_accept_enqueue(parent, sk);
2158
2159 __l2cap_chan_add(conn, chan);
2160
2161 dcid = chan->scid;
2162
2163 l2cap_sock_set_timer(sk, sk->sk_sndtimeo);
2164
2165 chan->ident = cmd->ident;
2166
2167 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
2168 if (l2cap_check_security(chan)) {
2169 if (bt_sk(sk)->defer_setup) {
2170 sk->sk_state = BT_CONNECT2;
2171 result = L2CAP_CR_PEND;
2172 status = L2CAP_CS_AUTHOR_PEND;
2173 parent->sk_data_ready(parent, 0);
2174 } else {
2175 sk->sk_state = BT_CONFIG;
2176 result = L2CAP_CR_SUCCESS;
2177 status = L2CAP_CS_NO_INFO;
2178 }
2179 } else {
2180 sk->sk_state = BT_CONNECT2;
2181 result = L2CAP_CR_PEND;
2182 status = L2CAP_CS_AUTHEN_PEND;
2183 }
2184 } else {
2185 sk->sk_state = BT_CONNECT2;
2186 result = L2CAP_CR_PEND;
2187 status = L2CAP_CS_NO_INFO;
2188 }
2189
2190 write_unlock_bh(&conn->chan_lock);
2191
2192 response:
2193 bh_unlock_sock(parent);
2194
2195 sendresp:
2196 rsp.scid = cpu_to_le16(scid);
2197 rsp.dcid = cpu_to_le16(dcid);
2198 rsp.result = cpu_to_le16(result);
2199 rsp.status = cpu_to_le16(status);
2200 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
2201
2202 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
2203 struct l2cap_info_req info;
2204 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
2205
2206 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
2207 conn->info_ident = l2cap_get_ident(conn);
2208
2209 mod_timer(&conn->info_timer, jiffies +
2210 msecs_to_jiffies(L2CAP_INFO_TIMEOUT));
2211
2212 l2cap_send_cmd(conn, conn->info_ident,
2213 L2CAP_INFO_REQ, sizeof(info), &info);
2214 }
2215
2216 if (chan && !(chan->conf_state & L2CAP_CONF_REQ_SENT) &&
2217 result == L2CAP_CR_SUCCESS) {
2218 u8 buf[128];
2219 chan->conf_state |= L2CAP_CONF_REQ_SENT;
2220 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2221 l2cap_build_conf_req(chan, buf), buf);
2222 chan->num_conf_req++;
2223 }
2224
2225 return 0;
2226 }
2227
2228 static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
2229 {
2230 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
2231 u16 scid, dcid, result, status;
2232 struct l2cap_chan *chan;
2233 struct sock *sk;
2234 u8 req[128];
2235
2236 scid = __le16_to_cpu(rsp->scid);
2237 dcid = __le16_to_cpu(rsp->dcid);
2238 result = __le16_to_cpu(rsp->result);
2239 status = __le16_to_cpu(rsp->status);
2240
2241 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status);
2242
2243 if (scid) {
2244 chan = l2cap_get_chan_by_scid(conn, scid);
2245 if (!chan)
2246 return -EFAULT;
2247 } else {
2248 chan = l2cap_get_chan_by_ident(conn, cmd->ident);
2249 if (!chan)
2250 return -EFAULT;
2251 }
2252
2253 sk = chan->sk;
2254
2255 switch (result) {
2256 case L2CAP_CR_SUCCESS:
2257 sk->sk_state = BT_CONFIG;
2258 chan->ident = 0;
2259 chan->dcid = dcid;
2260 chan->conf_state &= ~L2CAP_CONF_CONNECT_PEND;
2261
2262 if (chan->conf_state & L2CAP_CONF_REQ_SENT)
2263 break;
2264
2265 chan->conf_state |= L2CAP_CONF_REQ_SENT;
2266
2267 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
2268 l2cap_build_conf_req(chan, req), req);
2269 chan->num_conf_req++;
2270 break;
2271
2272 case L2CAP_CR_PEND:
2273 chan->conf_state |= L2CAP_CONF_CONNECT_PEND;
2274 break;
2275
2276 default:
2277 /* don't delete l2cap channel if sk is owned by user */
2278 if (sock_owned_by_user(sk)) {
2279 sk->sk_state = BT_DISCONN;
2280 l2cap_sock_clear_timer(sk);
2281 l2cap_sock_set_timer(sk, HZ / 5);
2282 break;
2283 }
2284
2285 l2cap_chan_del(chan, ECONNREFUSED);
2286 break;
2287 }
2288
2289 bh_unlock_sock(sk);
2290 return 0;
2291 }
2292
2293 static inline void set_default_fcs(struct l2cap_chan *chan)
2294 {
2295 struct l2cap_pinfo *pi = l2cap_pi(chan->sk);
2296
2297 /* FCS is enabled only in ERTM or streaming mode, if one or both
2298 * sides request it.
2299 */
2300 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
2301 chan->fcs = L2CAP_FCS_NONE;
2302 else if (!(pi->chan->conf_state & L2CAP_CONF_NO_FCS_RECV))
2303 chan->fcs = L2CAP_FCS_CRC16;
2304 }
2305
2306 static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
2307 {
2308 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
2309 u16 dcid, flags;
2310 u8 rsp[64];
2311 struct l2cap_chan *chan;
2312 struct sock *sk;
2313 int len;
2314
2315 dcid = __le16_to_cpu(req->dcid);
2316 flags = __le16_to_cpu(req->flags);
2317
2318 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
2319
2320 chan = l2cap_get_chan_by_scid(conn, dcid);
2321 if (!chan)
2322 return -ENOENT;
2323
2324 sk = chan->sk;
2325
2326 if ((bt_sk(sk)->defer_setup && sk->sk_state != BT_CONNECT2) ||
2327 (!bt_sk(sk)->defer_setup && sk->sk_state != BT_CONFIG)) {
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 parent->sk_data_ready(parent, 0);
4014 } else {
4015 sk->sk_state = BT_CONFIG;
4016 res = L2CAP_CR_SUCCESS;
4017 stat = L2CAP_CS_NO_INFO;
4018 }
4019 } else {
4020 sk->sk_state = BT_DISCONN;
4021 l2cap_sock_set_timer(sk, HZ / 10);
4022 res = L2CAP_CR_SEC_BLOCK;
4023 stat = L2CAP_CS_NO_INFO;
4024 }
4025
4026 rsp.scid = cpu_to_le16(chan->dcid);
4027 rsp.dcid = cpu_to_le16(chan->scid);
4028 rsp.result = cpu_to_le16(res);
4029 rsp.status = cpu_to_le16(stat);
4030 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
4031 sizeof(rsp), &rsp);
4032 }
4033
4034 bh_unlock_sock(sk);
4035 }
4036
4037 read_unlock(&conn->chan_lock);
4038
4039 return 0;
4040 }
4041
4042 static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
4043 {
4044 struct l2cap_conn *conn = hcon->l2cap_data;
4045
4046 if (!conn)
4047 conn = l2cap_conn_add(hcon, 0);
4048
4049 if (!conn)
4050 goto drop;
4051
4052 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
4053
4054 if (!(flags & ACL_CONT)) {
4055 struct l2cap_hdr *hdr;
4056 struct l2cap_chan *chan;
4057 u16 cid;
4058 int len;
4059
4060 if (conn->rx_len) {
4061 BT_ERR("Unexpected start frame (len %d)", skb->len);
4062 kfree_skb(conn->rx_skb);
4063 conn->rx_skb = NULL;
4064 conn->rx_len = 0;
4065 l2cap_conn_unreliable(conn, ECOMM);
4066 }
4067
4068 /* Start fragment always begin with Basic L2CAP header */
4069 if (skb->len < L2CAP_HDR_SIZE) {
4070 BT_ERR("Frame is too short (len %d)", skb->len);
4071 l2cap_conn_unreliable(conn, ECOMM);
4072 goto drop;
4073 }
4074
4075 hdr = (struct l2cap_hdr *) skb->data;
4076 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
4077 cid = __le16_to_cpu(hdr->cid);
4078
4079 if (len == skb->len) {
4080 /* Complete frame received */
4081 l2cap_recv_frame(conn, skb);
4082 return 0;
4083 }
4084
4085 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
4086
4087 if (skb->len > len) {
4088 BT_ERR("Frame is too long (len %d, expected len %d)",
4089 skb->len, len);
4090 l2cap_conn_unreliable(conn, ECOMM);
4091 goto drop;
4092 }
4093
4094 chan = l2cap_get_chan_by_scid(conn, cid);
4095
4096 if (chan && chan->sk) {
4097 struct sock *sk = chan->sk;
4098
4099 if (chan->imtu < len - L2CAP_HDR_SIZE) {
4100 BT_ERR("Frame exceeding recv MTU (len %d, "
4101 "MTU %d)", len,
4102 chan->imtu);
4103 bh_unlock_sock(sk);
4104 l2cap_conn_unreliable(conn, ECOMM);
4105 goto drop;
4106 }
4107 bh_unlock_sock(sk);
4108 }
4109
4110 /* Allocate skb for the complete frame (with header) */
4111 conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC);
4112 if (!conn->rx_skb)
4113 goto drop;
4114
4115 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
4116 skb->len);
4117 conn->rx_len = len - skb->len;
4118 } else {
4119 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
4120
4121 if (!conn->rx_len) {
4122 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
4123 l2cap_conn_unreliable(conn, ECOMM);
4124 goto drop;
4125 }
4126
4127 if (skb->len > conn->rx_len) {
4128 BT_ERR("Fragment is too long (len %d, expected %d)",
4129 skb->len, conn->rx_len);
4130 kfree_skb(conn->rx_skb);
4131 conn->rx_skb = NULL;
4132 conn->rx_len = 0;
4133 l2cap_conn_unreliable(conn, ECOMM);
4134 goto drop;
4135 }
4136
4137 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
4138 skb->len);
4139 conn->rx_len -= skb->len;
4140
4141 if (!conn->rx_len) {
4142 /* Complete frame received */
4143 l2cap_recv_frame(conn, conn->rx_skb);
4144 conn->rx_skb = NULL;
4145 }
4146 }
4147
4148 drop:
4149 kfree_skb(skb);
4150 return 0;
4151 }
4152
4153 static int l2cap_debugfs_show(struct seq_file *f, void *p)
4154 {
4155 struct l2cap_chan *c;
4156
4157 read_lock_bh(&chan_list_lock);
4158
4159 list_for_each_entry(c, &chan_list, global_l) {
4160 struct sock *sk = c->sk;
4161
4162 seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
4163 batostr(&bt_sk(sk)->src),
4164 batostr(&bt_sk(sk)->dst),
4165 sk->sk_state, __le16_to_cpu(c->psm),
4166 c->scid, c->dcid, c->imtu, c->omtu,
4167 c->sec_level, c->mode);
4168 }
4169
4170 read_unlock_bh(&chan_list_lock);
4171
4172 return 0;
4173 }
4174
4175 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
4176 {
4177 return single_open(file, l2cap_debugfs_show, inode->i_private);
4178 }
4179
4180 static const struct file_operations l2cap_debugfs_fops = {
4181 .open = l2cap_debugfs_open,
4182 .read = seq_read,
4183 .llseek = seq_lseek,
4184 .release = single_release,
4185 };
4186
4187 static struct dentry *l2cap_debugfs;
4188
4189 static struct hci_proto l2cap_hci_proto = {
4190 .name = "L2CAP",
4191 .id = HCI_PROTO_L2CAP,
4192 .connect_ind = l2cap_connect_ind,
4193 .connect_cfm = l2cap_connect_cfm,
4194 .disconn_ind = l2cap_disconn_ind,
4195 .disconn_cfm = l2cap_disconn_cfm,
4196 .security_cfm = l2cap_security_cfm,
4197 .recv_acldata = l2cap_recv_acldata
4198 };
4199
4200 int __init l2cap_init(void)
4201 {
4202 int err;
4203
4204 err = l2cap_init_sockets();
4205 if (err < 0)
4206 return err;
4207
4208 _busy_wq = create_singlethread_workqueue("l2cap");
4209 if (!_busy_wq) {
4210 err = -ENOMEM;
4211 goto error;
4212 }
4213
4214 err = hci_register_proto(&l2cap_hci_proto);
4215 if (err < 0) {
4216 BT_ERR("L2CAP protocol registration failed");
4217 bt_sock_unregister(BTPROTO_L2CAP);
4218 goto error;
4219 }
4220
4221 if (bt_debugfs) {
4222 l2cap_debugfs = debugfs_create_file("l2cap", 0444,
4223 bt_debugfs, NULL, &l2cap_debugfs_fops);
4224 if (!l2cap_debugfs)
4225 BT_ERR("Failed to create L2CAP debug file");
4226 }
4227
4228 return 0;
4229
4230 error:
4231 destroy_workqueue(_busy_wq);
4232 l2cap_cleanup_sockets();
4233 return err;
4234 }
4235
4236 void l2cap_exit(void)
4237 {
4238 debugfs_remove(l2cap_debugfs);
4239
4240 flush_workqueue(_busy_wq);
4241 destroy_workqueue(_busy_wq);
4242
4243 if (hci_unregister_proto(&l2cap_hci_proto) < 0)
4244 BT_ERR("L2CAP protocol unregistration failed");
4245
4246 l2cap_cleanup_sockets();
4247 }
4248
4249 module_param(disable_ertm, bool, 0644);
4250 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree