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Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[deliverable/linux.git] / net / bluetooth / l2cap_core.c
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 Copyright (C) 2011 ProFUSION Embedded Systems
7 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
8
9 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License version 2 as
13 published by the Free Software Foundation;
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
16 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
18 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
19 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
20 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
21 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
22 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23
24 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
25 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
26 SOFTWARE IS DISCLAIMED.
27 */
28
29 /* Bluetooth L2CAP core. */
30
31 #include <linux/module.h>
32
33 #include <linux/debugfs.h>
34 #include <linux/crc16.h>
35
36 #include <net/bluetooth/bluetooth.h>
37 #include <net/bluetooth/hci_core.h>
38 #include <net/bluetooth/l2cap.h>
39 #include <net/bluetooth/smp.h>
40 #include <net/bluetooth/a2mp.h>
41 #include <net/bluetooth/amp.h>
42
43 bool disable_ertm;
44
45 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN;
46 static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP, };
47
48 static LIST_HEAD(chan_list);
49 static DEFINE_RWLOCK(chan_list_lock);
50
51 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
52 u8 code, u8 ident, u16 dlen, void *data);
53 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
54 void *data);
55 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
56 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
57
58 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
59 struct sk_buff_head *skbs, u8 event);
60
61 /* ---- L2CAP channels ---- */
62
63 static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
64 u16 cid)
65 {
66 struct l2cap_chan *c;
67
68 list_for_each_entry(c, &conn->chan_l, list) {
69 if (c->dcid == cid)
70 return c;
71 }
72 return NULL;
73 }
74
75 static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
76 u16 cid)
77 {
78 struct l2cap_chan *c;
79
80 list_for_each_entry(c, &conn->chan_l, list) {
81 if (c->scid == cid)
82 return c;
83 }
84 return NULL;
85 }
86
87 /* Find channel with given SCID.
88 * Returns locked channel. */
89 static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
90 u16 cid)
91 {
92 struct l2cap_chan *c;
93
94 mutex_lock(&conn->chan_lock);
95 c = __l2cap_get_chan_by_scid(conn, cid);
96 if (c)
97 l2cap_chan_lock(c);
98 mutex_unlock(&conn->chan_lock);
99
100 return c;
101 }
102
103 /* Find channel with given DCID.
104 * Returns locked channel.
105 */
106 static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
107 u16 cid)
108 {
109 struct l2cap_chan *c;
110
111 mutex_lock(&conn->chan_lock);
112 c = __l2cap_get_chan_by_dcid(conn, cid);
113 if (c)
114 l2cap_chan_lock(c);
115 mutex_unlock(&conn->chan_lock);
116
117 return c;
118 }
119
120 static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
121 u8 ident)
122 {
123 struct l2cap_chan *c;
124
125 list_for_each_entry(c, &conn->chan_l, list) {
126 if (c->ident == ident)
127 return c;
128 }
129 return NULL;
130 }
131
132 static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
133 u8 ident)
134 {
135 struct l2cap_chan *c;
136
137 mutex_lock(&conn->chan_lock);
138 c = __l2cap_get_chan_by_ident(conn, ident);
139 if (c)
140 l2cap_chan_lock(c);
141 mutex_unlock(&conn->chan_lock);
142
143 return c;
144 }
145
146 static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
147 {
148 struct l2cap_chan *c;
149
150 list_for_each_entry(c, &chan_list, global_l) {
151 if (c->sport == psm && !bacmp(&bt_sk(c->sk)->src, src))
152 return c;
153 }
154 return NULL;
155 }
156
157 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
158 {
159 int err;
160
161 write_lock(&chan_list_lock);
162
163 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
164 err = -EADDRINUSE;
165 goto done;
166 }
167
168 if (psm) {
169 chan->psm = psm;
170 chan->sport = psm;
171 err = 0;
172 } else {
173 u16 p;
174
175 err = -EINVAL;
176 for (p = 0x1001; p < 0x1100; p += 2)
177 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
178 chan->psm = cpu_to_le16(p);
179 chan->sport = cpu_to_le16(p);
180 err = 0;
181 break;
182 }
183 }
184
185 done:
186 write_unlock(&chan_list_lock);
187 return err;
188 }
189
190 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
191 {
192 write_lock(&chan_list_lock);
193
194 chan->scid = scid;
195
196 write_unlock(&chan_list_lock);
197
198 return 0;
199 }
200
201 static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
202 {
203 u16 cid = L2CAP_CID_DYN_START;
204
205 for (; cid < L2CAP_CID_DYN_END; cid++) {
206 if (!__l2cap_get_chan_by_scid(conn, cid))
207 return cid;
208 }
209
210 return 0;
211 }
212
213 static void __l2cap_state_change(struct l2cap_chan *chan, int state)
214 {
215 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
216 state_to_string(state));
217
218 chan->state = state;
219 chan->ops->state_change(chan, state);
220 }
221
222 static void l2cap_state_change(struct l2cap_chan *chan, int state)
223 {
224 struct sock *sk = chan->sk;
225
226 lock_sock(sk);
227 __l2cap_state_change(chan, state);
228 release_sock(sk);
229 }
230
231 static inline void __l2cap_chan_set_err(struct l2cap_chan *chan, int err)
232 {
233 struct sock *sk = chan->sk;
234
235 sk->sk_err = err;
236 }
237
238 static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
239 {
240 struct sock *sk = chan->sk;
241
242 lock_sock(sk);
243 __l2cap_chan_set_err(chan, err);
244 release_sock(sk);
245 }
246
247 static void __set_retrans_timer(struct l2cap_chan *chan)
248 {
249 if (!delayed_work_pending(&chan->monitor_timer) &&
250 chan->retrans_timeout) {
251 l2cap_set_timer(chan, &chan->retrans_timer,
252 msecs_to_jiffies(chan->retrans_timeout));
253 }
254 }
255
256 static void __set_monitor_timer(struct l2cap_chan *chan)
257 {
258 __clear_retrans_timer(chan);
259 if (chan->monitor_timeout) {
260 l2cap_set_timer(chan, &chan->monitor_timer,
261 msecs_to_jiffies(chan->monitor_timeout));
262 }
263 }
264
265 static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
266 u16 seq)
267 {
268 struct sk_buff *skb;
269
270 skb_queue_walk(head, skb) {
271 if (bt_cb(skb)->control.txseq == seq)
272 return skb;
273 }
274
275 return NULL;
276 }
277
278 /* ---- L2CAP sequence number lists ---- */
279
280 /* For ERTM, ordered lists of sequence numbers must be tracked for
281 * SREJ requests that are received and for frames that are to be
282 * retransmitted. These seq_list functions implement a singly-linked
283 * list in an array, where membership in the list can also be checked
284 * in constant time. Items can also be added to the tail of the list
285 * and removed from the head in constant time, without further memory
286 * allocs or frees.
287 */
288
289 static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
290 {
291 size_t alloc_size, i;
292
293 /* Allocated size is a power of 2 to map sequence numbers
294 * (which may be up to 14 bits) in to a smaller array that is
295 * sized for the negotiated ERTM transmit windows.
296 */
297 alloc_size = roundup_pow_of_two(size);
298
299 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
300 if (!seq_list->list)
301 return -ENOMEM;
302
303 seq_list->mask = alloc_size - 1;
304 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
305 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
306 for (i = 0; i < alloc_size; i++)
307 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
308
309 return 0;
310 }
311
312 static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
313 {
314 kfree(seq_list->list);
315 }
316
317 static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
318 u16 seq)
319 {
320 /* Constant-time check for list membership */
321 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
322 }
323
324 static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
325 {
326 u16 mask = seq_list->mask;
327
328 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
329 /* In case someone tries to pop the head of an empty list */
330 return L2CAP_SEQ_LIST_CLEAR;
331 } else if (seq_list->head == seq) {
332 /* Head can be removed in constant time */
333 seq_list->head = seq_list->list[seq & mask];
334 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
335
336 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
337 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
338 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
339 }
340 } else {
341 /* Walk the list to find the sequence number */
342 u16 prev = seq_list->head;
343 while (seq_list->list[prev & mask] != seq) {
344 prev = seq_list->list[prev & mask];
345 if (prev == L2CAP_SEQ_LIST_TAIL)
346 return L2CAP_SEQ_LIST_CLEAR;
347 }
348
349 /* Unlink the number from the list and clear it */
350 seq_list->list[prev & mask] = seq_list->list[seq & mask];
351 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
352 if (seq_list->tail == seq)
353 seq_list->tail = prev;
354 }
355 return seq;
356 }
357
358 static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
359 {
360 /* Remove the head in constant time */
361 return l2cap_seq_list_remove(seq_list, seq_list->head);
362 }
363
364 static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
365 {
366 u16 i;
367
368 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
369 return;
370
371 for (i = 0; i <= seq_list->mask; i++)
372 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
373
374 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
375 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
376 }
377
378 static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
379 {
380 u16 mask = seq_list->mask;
381
382 /* All appends happen in constant time */
383
384 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
385 return;
386
387 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
388 seq_list->head = seq;
389 else
390 seq_list->list[seq_list->tail & mask] = seq;
391
392 seq_list->tail = seq;
393 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
394 }
395
396 static void l2cap_chan_timeout(struct work_struct *work)
397 {
398 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
399 chan_timer.work);
400 struct l2cap_conn *conn = chan->conn;
401 int reason;
402
403 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
404
405 mutex_lock(&conn->chan_lock);
406 l2cap_chan_lock(chan);
407
408 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
409 reason = ECONNREFUSED;
410 else if (chan->state == BT_CONNECT &&
411 chan->sec_level != BT_SECURITY_SDP)
412 reason = ECONNREFUSED;
413 else
414 reason = ETIMEDOUT;
415
416 l2cap_chan_close(chan, reason);
417
418 l2cap_chan_unlock(chan);
419
420 chan->ops->close(chan);
421 mutex_unlock(&conn->chan_lock);
422
423 l2cap_chan_put(chan);
424 }
425
426 struct l2cap_chan *l2cap_chan_create(void)
427 {
428 struct l2cap_chan *chan;
429
430 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
431 if (!chan)
432 return NULL;
433
434 mutex_init(&chan->lock);
435
436 write_lock(&chan_list_lock);
437 list_add(&chan->global_l, &chan_list);
438 write_unlock(&chan_list_lock);
439
440 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
441
442 chan->state = BT_OPEN;
443
444 kref_init(&chan->kref);
445
446 /* This flag is cleared in l2cap_chan_ready() */
447 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
448
449 BT_DBG("chan %p", chan);
450
451 return chan;
452 }
453
454 static void l2cap_chan_destroy(struct kref *kref)
455 {
456 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
457
458 BT_DBG("chan %p", chan);
459
460 write_lock(&chan_list_lock);
461 list_del(&chan->global_l);
462 write_unlock(&chan_list_lock);
463
464 kfree(chan);
465 }
466
467 void l2cap_chan_hold(struct l2cap_chan *c)
468 {
469 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
470
471 kref_get(&c->kref);
472 }
473
474 void l2cap_chan_put(struct l2cap_chan *c)
475 {
476 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
477
478 kref_put(&c->kref, l2cap_chan_destroy);
479 }
480
481 void l2cap_chan_set_defaults(struct l2cap_chan *chan)
482 {
483 chan->fcs = L2CAP_FCS_CRC16;
484 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
485 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
486 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
487 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
488 chan->sec_level = BT_SECURITY_LOW;
489
490 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
491 }
492
493 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
494 {
495 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
496 __le16_to_cpu(chan->psm), chan->dcid);
497
498 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
499
500 chan->conn = conn;
501
502 switch (chan->chan_type) {
503 case L2CAP_CHAN_CONN_ORIENTED:
504 if (conn->hcon->type == LE_LINK) {
505 /* LE connection */
506 chan->omtu = L2CAP_DEFAULT_MTU;
507 if (chan->dcid == L2CAP_CID_ATT)
508 chan->scid = L2CAP_CID_ATT;
509 else
510 chan->scid = l2cap_alloc_cid(conn);
511 } else {
512 /* Alloc CID for connection-oriented socket */
513 chan->scid = l2cap_alloc_cid(conn);
514 chan->omtu = L2CAP_DEFAULT_MTU;
515 }
516 break;
517
518 case L2CAP_CHAN_CONN_LESS:
519 /* Connectionless socket */
520 chan->scid = L2CAP_CID_CONN_LESS;
521 chan->dcid = L2CAP_CID_CONN_LESS;
522 chan->omtu = L2CAP_DEFAULT_MTU;
523 break;
524
525 case L2CAP_CHAN_CONN_FIX_A2MP:
526 chan->scid = L2CAP_CID_A2MP;
527 chan->dcid = L2CAP_CID_A2MP;
528 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
529 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
530 break;
531
532 default:
533 /* Raw socket can send/recv signalling messages only */
534 chan->scid = L2CAP_CID_SIGNALING;
535 chan->dcid = L2CAP_CID_SIGNALING;
536 chan->omtu = L2CAP_DEFAULT_MTU;
537 }
538
539 chan->local_id = L2CAP_BESTEFFORT_ID;
540 chan->local_stype = L2CAP_SERV_BESTEFFORT;
541 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
542 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
543 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
544 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
545
546 l2cap_chan_hold(chan);
547
548 hci_conn_hold(conn->hcon);
549
550 list_add(&chan->list, &conn->chan_l);
551 }
552
553 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
554 {
555 mutex_lock(&conn->chan_lock);
556 __l2cap_chan_add(conn, chan);
557 mutex_unlock(&conn->chan_lock);
558 }
559
560 void l2cap_chan_del(struct l2cap_chan *chan, int err)
561 {
562 struct l2cap_conn *conn = chan->conn;
563
564 __clear_chan_timer(chan);
565
566 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
567
568 if (conn) {
569 struct amp_mgr *mgr = conn->hcon->amp_mgr;
570 /* Delete from channel list */
571 list_del(&chan->list);
572
573 l2cap_chan_put(chan);
574
575 chan->conn = NULL;
576
577 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
578 hci_conn_drop(conn->hcon);
579
580 if (mgr && mgr->bredr_chan == chan)
581 mgr->bredr_chan = NULL;
582 }
583
584 if (chan->hs_hchan) {
585 struct hci_chan *hs_hchan = chan->hs_hchan;
586
587 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
588 amp_disconnect_logical_link(hs_hchan);
589 }
590
591 chan->ops->teardown(chan, err);
592
593 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
594 return;
595
596 switch(chan->mode) {
597 case L2CAP_MODE_BASIC:
598 break;
599
600 case L2CAP_MODE_ERTM:
601 __clear_retrans_timer(chan);
602 __clear_monitor_timer(chan);
603 __clear_ack_timer(chan);
604
605 skb_queue_purge(&chan->srej_q);
606
607 l2cap_seq_list_free(&chan->srej_list);
608 l2cap_seq_list_free(&chan->retrans_list);
609
610 /* fall through */
611
612 case L2CAP_MODE_STREAMING:
613 skb_queue_purge(&chan->tx_q);
614 break;
615 }
616
617 return;
618 }
619
620 void l2cap_chan_close(struct l2cap_chan *chan, int reason)
621 {
622 struct l2cap_conn *conn = chan->conn;
623 struct sock *sk = chan->sk;
624
625 BT_DBG("chan %p state %s sk %p", chan, state_to_string(chan->state),
626 sk);
627
628 switch (chan->state) {
629 case BT_LISTEN:
630 chan->ops->teardown(chan, 0);
631 break;
632
633 case BT_CONNECTED:
634 case BT_CONFIG:
635 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
636 conn->hcon->type == ACL_LINK) {
637 __set_chan_timer(chan, sk->sk_sndtimeo);
638 l2cap_send_disconn_req(chan, reason);
639 } else
640 l2cap_chan_del(chan, reason);
641 break;
642
643 case BT_CONNECT2:
644 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
645 conn->hcon->type == ACL_LINK) {
646 struct l2cap_conn_rsp rsp;
647 __u16 result;
648
649 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
650 result = L2CAP_CR_SEC_BLOCK;
651 else
652 result = L2CAP_CR_BAD_PSM;
653 l2cap_state_change(chan, BT_DISCONN);
654
655 rsp.scid = cpu_to_le16(chan->dcid);
656 rsp.dcid = cpu_to_le16(chan->scid);
657 rsp.result = cpu_to_le16(result);
658 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
659 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
660 sizeof(rsp), &rsp);
661 }
662
663 l2cap_chan_del(chan, reason);
664 break;
665
666 case BT_CONNECT:
667 case BT_DISCONN:
668 l2cap_chan_del(chan, reason);
669 break;
670
671 default:
672 chan->ops->teardown(chan, 0);
673 break;
674 }
675 }
676
677 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
678 {
679 if (chan->chan_type == L2CAP_CHAN_RAW) {
680 switch (chan->sec_level) {
681 case BT_SECURITY_HIGH:
682 return HCI_AT_DEDICATED_BONDING_MITM;
683 case BT_SECURITY_MEDIUM:
684 return HCI_AT_DEDICATED_BONDING;
685 default:
686 return HCI_AT_NO_BONDING;
687 }
688 } else if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
689 if (chan->sec_level == BT_SECURITY_LOW)
690 chan->sec_level = BT_SECURITY_SDP;
691
692 if (chan->sec_level == BT_SECURITY_HIGH)
693 return HCI_AT_NO_BONDING_MITM;
694 else
695 return HCI_AT_NO_BONDING;
696 } else {
697 switch (chan->sec_level) {
698 case BT_SECURITY_HIGH:
699 return HCI_AT_GENERAL_BONDING_MITM;
700 case BT_SECURITY_MEDIUM:
701 return HCI_AT_GENERAL_BONDING;
702 default:
703 return HCI_AT_NO_BONDING;
704 }
705 }
706 }
707
708 /* Service level security */
709 int l2cap_chan_check_security(struct l2cap_chan *chan)
710 {
711 struct l2cap_conn *conn = chan->conn;
712 __u8 auth_type;
713
714 auth_type = l2cap_get_auth_type(chan);
715
716 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
717 }
718
719 static u8 l2cap_get_ident(struct l2cap_conn *conn)
720 {
721 u8 id;
722
723 /* Get next available identificator.
724 * 1 - 128 are used by kernel.
725 * 129 - 199 are reserved.
726 * 200 - 254 are used by utilities like l2ping, etc.
727 */
728
729 spin_lock(&conn->lock);
730
731 if (++conn->tx_ident > 128)
732 conn->tx_ident = 1;
733
734 id = conn->tx_ident;
735
736 spin_unlock(&conn->lock);
737
738 return id;
739 }
740
741 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
742 void *data)
743 {
744 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
745 u8 flags;
746
747 BT_DBG("code 0x%2.2x", code);
748
749 if (!skb)
750 return;
751
752 if (lmp_no_flush_capable(conn->hcon->hdev))
753 flags = ACL_START_NO_FLUSH;
754 else
755 flags = ACL_START;
756
757 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
758 skb->priority = HCI_PRIO_MAX;
759
760 hci_send_acl(conn->hchan, skb, flags);
761 }
762
763 static bool __chan_is_moving(struct l2cap_chan *chan)
764 {
765 return chan->move_state != L2CAP_MOVE_STABLE &&
766 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
767 }
768
769 static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
770 {
771 struct hci_conn *hcon = chan->conn->hcon;
772 u16 flags;
773
774 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
775 skb->priority);
776
777 if (chan->hs_hcon && !__chan_is_moving(chan)) {
778 if (chan->hs_hchan)
779 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
780 else
781 kfree_skb(skb);
782
783 return;
784 }
785
786 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
787 lmp_no_flush_capable(hcon->hdev))
788 flags = ACL_START_NO_FLUSH;
789 else
790 flags = ACL_START;
791
792 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
793 hci_send_acl(chan->conn->hchan, skb, flags);
794 }
795
796 static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
797 {
798 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
799 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
800
801 if (enh & L2CAP_CTRL_FRAME_TYPE) {
802 /* S-Frame */
803 control->sframe = 1;
804 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
805 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
806
807 control->sar = 0;
808 control->txseq = 0;
809 } else {
810 /* I-Frame */
811 control->sframe = 0;
812 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
813 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
814
815 control->poll = 0;
816 control->super = 0;
817 }
818 }
819
820 static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
821 {
822 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
823 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
824
825 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
826 /* S-Frame */
827 control->sframe = 1;
828 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
829 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
830
831 control->sar = 0;
832 control->txseq = 0;
833 } else {
834 /* I-Frame */
835 control->sframe = 0;
836 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
837 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
838
839 control->poll = 0;
840 control->super = 0;
841 }
842 }
843
844 static inline void __unpack_control(struct l2cap_chan *chan,
845 struct sk_buff *skb)
846 {
847 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
848 __unpack_extended_control(get_unaligned_le32(skb->data),
849 &bt_cb(skb)->control);
850 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
851 } else {
852 __unpack_enhanced_control(get_unaligned_le16(skb->data),
853 &bt_cb(skb)->control);
854 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
855 }
856 }
857
858 static u32 __pack_extended_control(struct l2cap_ctrl *control)
859 {
860 u32 packed;
861
862 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
863 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
864
865 if (control->sframe) {
866 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
867 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
868 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
869 } else {
870 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
871 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
872 }
873
874 return packed;
875 }
876
877 static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
878 {
879 u16 packed;
880
881 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
882 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
883
884 if (control->sframe) {
885 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
886 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
887 packed |= L2CAP_CTRL_FRAME_TYPE;
888 } else {
889 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
890 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
891 }
892
893 return packed;
894 }
895
896 static inline void __pack_control(struct l2cap_chan *chan,
897 struct l2cap_ctrl *control,
898 struct sk_buff *skb)
899 {
900 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
901 put_unaligned_le32(__pack_extended_control(control),
902 skb->data + L2CAP_HDR_SIZE);
903 } else {
904 put_unaligned_le16(__pack_enhanced_control(control),
905 skb->data + L2CAP_HDR_SIZE);
906 }
907 }
908
909 static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
910 {
911 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
912 return L2CAP_EXT_HDR_SIZE;
913 else
914 return L2CAP_ENH_HDR_SIZE;
915 }
916
917 static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
918 u32 control)
919 {
920 struct sk_buff *skb;
921 struct l2cap_hdr *lh;
922 int hlen = __ertm_hdr_size(chan);
923
924 if (chan->fcs == L2CAP_FCS_CRC16)
925 hlen += L2CAP_FCS_SIZE;
926
927 skb = bt_skb_alloc(hlen, GFP_KERNEL);
928
929 if (!skb)
930 return ERR_PTR(-ENOMEM);
931
932 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
933 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
934 lh->cid = cpu_to_le16(chan->dcid);
935
936 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
937 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
938 else
939 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
940
941 if (chan->fcs == L2CAP_FCS_CRC16) {
942 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
943 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
944 }
945
946 skb->priority = HCI_PRIO_MAX;
947 return skb;
948 }
949
950 static void l2cap_send_sframe(struct l2cap_chan *chan,
951 struct l2cap_ctrl *control)
952 {
953 struct sk_buff *skb;
954 u32 control_field;
955
956 BT_DBG("chan %p, control %p", chan, control);
957
958 if (!control->sframe)
959 return;
960
961 if (__chan_is_moving(chan))
962 return;
963
964 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
965 !control->poll)
966 control->final = 1;
967
968 if (control->super == L2CAP_SUPER_RR)
969 clear_bit(CONN_RNR_SENT, &chan->conn_state);
970 else if (control->super == L2CAP_SUPER_RNR)
971 set_bit(CONN_RNR_SENT, &chan->conn_state);
972
973 if (control->super != L2CAP_SUPER_SREJ) {
974 chan->last_acked_seq = control->reqseq;
975 __clear_ack_timer(chan);
976 }
977
978 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
979 control->final, control->poll, control->super);
980
981 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
982 control_field = __pack_extended_control(control);
983 else
984 control_field = __pack_enhanced_control(control);
985
986 skb = l2cap_create_sframe_pdu(chan, control_field);
987 if (!IS_ERR(skb))
988 l2cap_do_send(chan, skb);
989 }
990
991 static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
992 {
993 struct l2cap_ctrl control;
994
995 BT_DBG("chan %p, poll %d", chan, poll);
996
997 memset(&control, 0, sizeof(control));
998 control.sframe = 1;
999 control.poll = poll;
1000
1001 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1002 control.super = L2CAP_SUPER_RNR;
1003 else
1004 control.super = L2CAP_SUPER_RR;
1005
1006 control.reqseq = chan->buffer_seq;
1007 l2cap_send_sframe(chan, &control);
1008 }
1009
1010 static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
1011 {
1012 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
1013 }
1014
1015 static bool __amp_capable(struct l2cap_chan *chan)
1016 {
1017 struct l2cap_conn *conn = chan->conn;
1018
1019 if (enable_hs &&
1020 hci_amp_capable() &&
1021 chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED &&
1022 conn->fixed_chan_mask & L2CAP_FC_A2MP)
1023 return true;
1024 else
1025 return false;
1026 }
1027
1028 static bool l2cap_check_efs(struct l2cap_chan *chan)
1029 {
1030 /* Check EFS parameters */
1031 return true;
1032 }
1033
1034 void l2cap_send_conn_req(struct l2cap_chan *chan)
1035 {
1036 struct l2cap_conn *conn = chan->conn;
1037 struct l2cap_conn_req req;
1038
1039 req.scid = cpu_to_le16(chan->scid);
1040 req.psm = chan->psm;
1041
1042 chan->ident = l2cap_get_ident(conn);
1043
1044 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1045
1046 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1047 }
1048
1049 static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1050 {
1051 struct l2cap_create_chan_req req;
1052 req.scid = cpu_to_le16(chan->scid);
1053 req.psm = chan->psm;
1054 req.amp_id = amp_id;
1055
1056 chan->ident = l2cap_get_ident(chan->conn);
1057
1058 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1059 sizeof(req), &req);
1060 }
1061
1062 static void l2cap_move_setup(struct l2cap_chan *chan)
1063 {
1064 struct sk_buff *skb;
1065
1066 BT_DBG("chan %p", chan);
1067
1068 if (chan->mode != L2CAP_MODE_ERTM)
1069 return;
1070
1071 __clear_retrans_timer(chan);
1072 __clear_monitor_timer(chan);
1073 __clear_ack_timer(chan);
1074
1075 chan->retry_count = 0;
1076 skb_queue_walk(&chan->tx_q, skb) {
1077 if (bt_cb(skb)->control.retries)
1078 bt_cb(skb)->control.retries = 1;
1079 else
1080 break;
1081 }
1082
1083 chan->expected_tx_seq = chan->buffer_seq;
1084
1085 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1086 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1087 l2cap_seq_list_clear(&chan->retrans_list);
1088 l2cap_seq_list_clear(&chan->srej_list);
1089 skb_queue_purge(&chan->srej_q);
1090
1091 chan->tx_state = L2CAP_TX_STATE_XMIT;
1092 chan->rx_state = L2CAP_RX_STATE_MOVE;
1093
1094 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1095 }
1096
1097 static void l2cap_move_done(struct l2cap_chan *chan)
1098 {
1099 u8 move_role = chan->move_role;
1100 BT_DBG("chan %p", chan);
1101
1102 chan->move_state = L2CAP_MOVE_STABLE;
1103 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1104
1105 if (chan->mode != L2CAP_MODE_ERTM)
1106 return;
1107
1108 switch (move_role) {
1109 case L2CAP_MOVE_ROLE_INITIATOR:
1110 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1111 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1112 break;
1113 case L2CAP_MOVE_ROLE_RESPONDER:
1114 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1115 break;
1116 }
1117 }
1118
1119 static void l2cap_chan_ready(struct l2cap_chan *chan)
1120 {
1121 /* This clears all conf flags, including CONF_NOT_COMPLETE */
1122 chan->conf_state = 0;
1123 __clear_chan_timer(chan);
1124
1125 chan->state = BT_CONNECTED;
1126
1127 chan->ops->ready(chan);
1128 }
1129
1130 static void l2cap_start_connection(struct l2cap_chan *chan)
1131 {
1132 if (__amp_capable(chan)) {
1133 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1134 a2mp_discover_amp(chan);
1135 } else {
1136 l2cap_send_conn_req(chan);
1137 }
1138 }
1139
1140 static void l2cap_do_start(struct l2cap_chan *chan)
1141 {
1142 struct l2cap_conn *conn = chan->conn;
1143
1144 if (conn->hcon->type == LE_LINK) {
1145 l2cap_chan_ready(chan);
1146 return;
1147 }
1148
1149 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
1150 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1151 return;
1152
1153 if (l2cap_chan_check_security(chan) &&
1154 __l2cap_no_conn_pending(chan)) {
1155 l2cap_start_connection(chan);
1156 }
1157 } else {
1158 struct l2cap_info_req req;
1159 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
1160
1161 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1162 conn->info_ident = l2cap_get_ident(conn);
1163
1164 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1165
1166 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1167 sizeof(req), &req);
1168 }
1169 }
1170
1171 static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1172 {
1173 u32 local_feat_mask = l2cap_feat_mask;
1174 if (!disable_ertm)
1175 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1176
1177 switch (mode) {
1178 case L2CAP_MODE_ERTM:
1179 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1180 case L2CAP_MODE_STREAMING:
1181 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1182 default:
1183 return 0x00;
1184 }
1185 }
1186
1187 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
1188 {
1189 struct sock *sk = chan->sk;
1190 struct l2cap_conn *conn = chan->conn;
1191 struct l2cap_disconn_req req;
1192
1193 if (!conn)
1194 return;
1195
1196 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1197 __clear_retrans_timer(chan);
1198 __clear_monitor_timer(chan);
1199 __clear_ack_timer(chan);
1200 }
1201
1202 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1203 l2cap_state_change(chan, BT_DISCONN);
1204 return;
1205 }
1206
1207 req.dcid = cpu_to_le16(chan->dcid);
1208 req.scid = cpu_to_le16(chan->scid);
1209 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1210 sizeof(req), &req);
1211
1212 lock_sock(sk);
1213 __l2cap_state_change(chan, BT_DISCONN);
1214 __l2cap_chan_set_err(chan, err);
1215 release_sock(sk);
1216 }
1217
1218 /* ---- L2CAP connections ---- */
1219 static void l2cap_conn_start(struct l2cap_conn *conn)
1220 {
1221 struct l2cap_chan *chan, *tmp;
1222
1223 BT_DBG("conn %p", conn);
1224
1225 mutex_lock(&conn->chan_lock);
1226
1227 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
1228 struct sock *sk = chan->sk;
1229
1230 l2cap_chan_lock(chan);
1231
1232 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1233 l2cap_chan_unlock(chan);
1234 continue;
1235 }
1236
1237 if (chan->state == BT_CONNECT) {
1238 if (!l2cap_chan_check_security(chan) ||
1239 !__l2cap_no_conn_pending(chan)) {
1240 l2cap_chan_unlock(chan);
1241 continue;
1242 }
1243
1244 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1245 && test_bit(CONF_STATE2_DEVICE,
1246 &chan->conf_state)) {
1247 l2cap_chan_close(chan, ECONNRESET);
1248 l2cap_chan_unlock(chan);
1249 continue;
1250 }
1251
1252 l2cap_start_connection(chan);
1253
1254 } else if (chan->state == BT_CONNECT2) {
1255 struct l2cap_conn_rsp rsp;
1256 char buf[128];
1257 rsp.scid = cpu_to_le16(chan->dcid);
1258 rsp.dcid = cpu_to_le16(chan->scid);
1259
1260 if (l2cap_chan_check_security(chan)) {
1261 lock_sock(sk);
1262 if (test_bit(BT_SK_DEFER_SETUP,
1263 &bt_sk(sk)->flags)) {
1264 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1265 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
1266 chan->ops->defer(chan);
1267
1268 } else {
1269 __l2cap_state_change(chan, BT_CONFIG);
1270 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1271 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
1272 }
1273 release_sock(sk);
1274 } else {
1275 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1276 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
1277 }
1278
1279 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1280 sizeof(rsp), &rsp);
1281
1282 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
1283 rsp.result != L2CAP_CR_SUCCESS) {
1284 l2cap_chan_unlock(chan);
1285 continue;
1286 }
1287
1288 set_bit(CONF_REQ_SENT, &chan->conf_state);
1289 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1290 l2cap_build_conf_req(chan, buf), buf);
1291 chan->num_conf_req++;
1292 }
1293
1294 l2cap_chan_unlock(chan);
1295 }
1296
1297 mutex_unlock(&conn->chan_lock);
1298 }
1299
1300 /* Find socket with cid and source/destination bdaddr.
1301 * Returns closest match, locked.
1302 */
1303 static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
1304 bdaddr_t *src,
1305 bdaddr_t *dst)
1306 {
1307 struct l2cap_chan *c, *c1 = NULL;
1308
1309 read_lock(&chan_list_lock);
1310
1311 list_for_each_entry(c, &chan_list, global_l) {
1312 struct sock *sk = c->sk;
1313
1314 if (state && c->state != state)
1315 continue;
1316
1317 if (c->scid == cid) {
1318 int src_match, dst_match;
1319 int src_any, dst_any;
1320
1321 /* Exact match. */
1322 src_match = !bacmp(&bt_sk(sk)->src, src);
1323 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1324 if (src_match && dst_match) {
1325 read_unlock(&chan_list_lock);
1326 return c;
1327 }
1328
1329 /* Closest match */
1330 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1331 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1332 if ((src_match && dst_any) || (src_any && dst_match) ||
1333 (src_any && dst_any))
1334 c1 = c;
1335 }
1336 }
1337
1338 read_unlock(&chan_list_lock);
1339
1340 return c1;
1341 }
1342
1343 static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1344 {
1345 struct sock *parent;
1346 struct l2cap_chan *chan, *pchan;
1347
1348 BT_DBG("");
1349
1350 /* Check if we have socket listening on cid */
1351 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
1352 conn->src, conn->dst);
1353 if (!pchan)
1354 return;
1355
1356 /* Client ATT sockets should override the server one */
1357 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1358 return;
1359
1360 parent = pchan->sk;
1361
1362 lock_sock(parent);
1363
1364 chan = pchan->ops->new_connection(pchan);
1365 if (!chan)
1366 goto clean;
1367
1368 chan->dcid = L2CAP_CID_ATT;
1369
1370 bacpy(&bt_sk(chan->sk)->src, conn->src);
1371 bacpy(&bt_sk(chan->sk)->dst, conn->dst);
1372
1373 __l2cap_chan_add(conn, chan);
1374
1375 clean:
1376 release_sock(parent);
1377 }
1378
1379 static void l2cap_conn_ready(struct l2cap_conn *conn)
1380 {
1381 struct l2cap_chan *chan;
1382 struct hci_conn *hcon = conn->hcon;
1383
1384 BT_DBG("conn %p", conn);
1385
1386 /* For outgoing pairing which doesn't necessarily have an
1387 * associated socket (e.g. mgmt_pair_device).
1388 */
1389 if (hcon->out && hcon->type == LE_LINK)
1390 smp_conn_security(hcon, hcon->pending_sec_level);
1391
1392 mutex_lock(&conn->chan_lock);
1393
1394 if (hcon->type == LE_LINK)
1395 l2cap_le_conn_ready(conn);
1396
1397 list_for_each_entry(chan, &conn->chan_l, list) {
1398
1399 l2cap_chan_lock(chan);
1400
1401 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1402 l2cap_chan_unlock(chan);
1403 continue;
1404 }
1405
1406 if (hcon->type == LE_LINK) {
1407 if (smp_conn_security(hcon, chan->sec_level))
1408 l2cap_chan_ready(chan);
1409
1410 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1411 struct sock *sk = chan->sk;
1412 __clear_chan_timer(chan);
1413 lock_sock(sk);
1414 __l2cap_state_change(chan, BT_CONNECTED);
1415 sk->sk_state_change(sk);
1416 release_sock(sk);
1417
1418 } else if (chan->state == BT_CONNECT)
1419 l2cap_do_start(chan);
1420
1421 l2cap_chan_unlock(chan);
1422 }
1423
1424 mutex_unlock(&conn->chan_lock);
1425 }
1426
1427 /* Notify sockets that we cannot guaranty reliability anymore */
1428 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1429 {
1430 struct l2cap_chan *chan;
1431
1432 BT_DBG("conn %p", conn);
1433
1434 mutex_lock(&conn->chan_lock);
1435
1436 list_for_each_entry(chan, &conn->chan_l, list) {
1437 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1438 l2cap_chan_set_err(chan, err);
1439 }
1440
1441 mutex_unlock(&conn->chan_lock);
1442 }
1443
1444 static void l2cap_info_timeout(struct work_struct *work)
1445 {
1446 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1447 info_timer.work);
1448
1449 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
1450 conn->info_ident = 0;
1451
1452 l2cap_conn_start(conn);
1453 }
1454
1455 /*
1456 * l2cap_user
1457 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1458 * callback is called during registration. The ->remove callback is called
1459 * during unregistration.
1460 * An l2cap_user object can either be explicitly unregistered or when the
1461 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1462 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1463 * External modules must own a reference to the l2cap_conn object if they intend
1464 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1465 * any time if they don't.
1466 */
1467
1468 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1469 {
1470 struct hci_dev *hdev = conn->hcon->hdev;
1471 int ret;
1472
1473 /* We need to check whether l2cap_conn is registered. If it is not, we
1474 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1475 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1476 * relies on the parent hci_conn object to be locked. This itself relies
1477 * on the hci_dev object to be locked. So we must lock the hci device
1478 * here, too. */
1479
1480 hci_dev_lock(hdev);
1481
1482 if (user->list.next || user->list.prev) {
1483 ret = -EINVAL;
1484 goto out_unlock;
1485 }
1486
1487 /* conn->hchan is NULL after l2cap_conn_del() was called */
1488 if (!conn->hchan) {
1489 ret = -ENODEV;
1490 goto out_unlock;
1491 }
1492
1493 ret = user->probe(conn, user);
1494 if (ret)
1495 goto out_unlock;
1496
1497 list_add(&user->list, &conn->users);
1498 ret = 0;
1499
1500 out_unlock:
1501 hci_dev_unlock(hdev);
1502 return ret;
1503 }
1504 EXPORT_SYMBOL(l2cap_register_user);
1505
1506 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1507 {
1508 struct hci_dev *hdev = conn->hcon->hdev;
1509
1510 hci_dev_lock(hdev);
1511
1512 if (!user->list.next || !user->list.prev)
1513 goto out_unlock;
1514
1515 list_del(&user->list);
1516 user->list.next = NULL;
1517 user->list.prev = NULL;
1518 user->remove(conn, user);
1519
1520 out_unlock:
1521 hci_dev_unlock(hdev);
1522 }
1523 EXPORT_SYMBOL(l2cap_unregister_user);
1524
1525 static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1526 {
1527 struct l2cap_user *user;
1528
1529 while (!list_empty(&conn->users)) {
1530 user = list_first_entry(&conn->users, struct l2cap_user, list);
1531 list_del(&user->list);
1532 user->list.next = NULL;
1533 user->list.prev = NULL;
1534 user->remove(conn, user);
1535 }
1536 }
1537
1538 static void l2cap_conn_del(struct hci_conn *hcon, int err)
1539 {
1540 struct l2cap_conn *conn = hcon->l2cap_data;
1541 struct l2cap_chan *chan, *l;
1542
1543 if (!conn)
1544 return;
1545
1546 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1547
1548 kfree_skb(conn->rx_skb);
1549
1550 l2cap_unregister_all_users(conn);
1551
1552 mutex_lock(&conn->chan_lock);
1553
1554 /* Kill channels */
1555 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
1556 l2cap_chan_hold(chan);
1557 l2cap_chan_lock(chan);
1558
1559 l2cap_chan_del(chan, err);
1560
1561 l2cap_chan_unlock(chan);
1562
1563 chan->ops->close(chan);
1564 l2cap_chan_put(chan);
1565 }
1566
1567 mutex_unlock(&conn->chan_lock);
1568
1569 hci_chan_del(conn->hchan);
1570
1571 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1572 cancel_delayed_work_sync(&conn->info_timer);
1573
1574 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
1575 cancel_delayed_work_sync(&conn->security_timer);
1576 smp_chan_destroy(conn);
1577 }
1578
1579 hcon->l2cap_data = NULL;
1580 conn->hchan = NULL;
1581 l2cap_conn_put(conn);
1582 }
1583
1584 static void security_timeout(struct work_struct *work)
1585 {
1586 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1587 security_timer.work);
1588
1589 BT_DBG("conn %p", conn);
1590
1591 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1592 smp_chan_destroy(conn);
1593 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1594 }
1595 }
1596
1597 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
1598 {
1599 struct l2cap_conn *conn = hcon->l2cap_data;
1600 struct hci_chan *hchan;
1601
1602 if (conn)
1603 return conn;
1604
1605 hchan = hci_chan_create(hcon);
1606 if (!hchan)
1607 return NULL;
1608
1609 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
1610 if (!conn) {
1611 hci_chan_del(hchan);
1612 return NULL;
1613 }
1614
1615 kref_init(&conn->ref);
1616 hcon->l2cap_data = conn;
1617 conn->hcon = hcon;
1618 hci_conn_get(conn->hcon);
1619 conn->hchan = hchan;
1620
1621 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
1622
1623 switch (hcon->type) {
1624 case LE_LINK:
1625 if (hcon->hdev->le_mtu) {
1626 conn->mtu = hcon->hdev->le_mtu;
1627 break;
1628 }
1629 /* fall through */
1630 default:
1631 conn->mtu = hcon->hdev->acl_mtu;
1632 break;
1633 }
1634
1635 conn->src = &hcon->hdev->bdaddr;
1636 conn->dst = &hcon->dst;
1637
1638 conn->feat_mask = 0;
1639
1640 spin_lock_init(&conn->lock);
1641 mutex_init(&conn->chan_lock);
1642
1643 INIT_LIST_HEAD(&conn->chan_l);
1644 INIT_LIST_HEAD(&conn->users);
1645
1646 if (hcon->type == LE_LINK)
1647 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
1648 else
1649 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
1650
1651 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
1652
1653 return conn;
1654 }
1655
1656 static void l2cap_conn_free(struct kref *ref)
1657 {
1658 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1659
1660 hci_conn_put(conn->hcon);
1661 kfree(conn);
1662 }
1663
1664 void l2cap_conn_get(struct l2cap_conn *conn)
1665 {
1666 kref_get(&conn->ref);
1667 }
1668 EXPORT_SYMBOL(l2cap_conn_get);
1669
1670 void l2cap_conn_put(struct l2cap_conn *conn)
1671 {
1672 kref_put(&conn->ref, l2cap_conn_free);
1673 }
1674 EXPORT_SYMBOL(l2cap_conn_put);
1675
1676 /* ---- Socket interface ---- */
1677
1678 /* Find socket with psm and source / destination bdaddr.
1679 * Returns closest match.
1680 */
1681 static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1682 bdaddr_t *src,
1683 bdaddr_t *dst)
1684 {
1685 struct l2cap_chan *c, *c1 = NULL;
1686
1687 read_lock(&chan_list_lock);
1688
1689 list_for_each_entry(c, &chan_list, global_l) {
1690 struct sock *sk = c->sk;
1691
1692 if (state && c->state != state)
1693 continue;
1694
1695 if (c->psm == psm) {
1696 int src_match, dst_match;
1697 int src_any, dst_any;
1698
1699 /* Exact match. */
1700 src_match = !bacmp(&bt_sk(sk)->src, src);
1701 dst_match = !bacmp(&bt_sk(sk)->dst, dst);
1702 if (src_match && dst_match) {
1703 read_unlock(&chan_list_lock);
1704 return c;
1705 }
1706
1707 /* Closest match */
1708 src_any = !bacmp(&bt_sk(sk)->src, BDADDR_ANY);
1709 dst_any = !bacmp(&bt_sk(sk)->dst, BDADDR_ANY);
1710 if ((src_match && dst_any) || (src_any && dst_match) ||
1711 (src_any && dst_any))
1712 c1 = c;
1713 }
1714 }
1715
1716 read_unlock(&chan_list_lock);
1717
1718 return c1;
1719 }
1720
1721 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1722 bdaddr_t *dst, u8 dst_type)
1723 {
1724 struct sock *sk = chan->sk;
1725 bdaddr_t *src = &bt_sk(sk)->src;
1726 struct l2cap_conn *conn;
1727 struct hci_conn *hcon;
1728 struct hci_dev *hdev;
1729 __u8 auth_type;
1730 int err;
1731
1732 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", src, dst,
1733 dst_type, __le16_to_cpu(psm));
1734
1735 hdev = hci_get_route(dst, src);
1736 if (!hdev)
1737 return -EHOSTUNREACH;
1738
1739 hci_dev_lock(hdev);
1740
1741 l2cap_chan_lock(chan);
1742
1743 /* PSM must be odd and lsb of upper byte must be 0 */
1744 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1745 chan->chan_type != L2CAP_CHAN_RAW) {
1746 err = -EINVAL;
1747 goto done;
1748 }
1749
1750 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1751 err = -EINVAL;
1752 goto done;
1753 }
1754
1755 switch (chan->mode) {
1756 case L2CAP_MODE_BASIC:
1757 break;
1758 case L2CAP_MODE_ERTM:
1759 case L2CAP_MODE_STREAMING:
1760 if (!disable_ertm)
1761 break;
1762 /* fall through */
1763 default:
1764 err = -ENOTSUPP;
1765 goto done;
1766 }
1767
1768 switch (chan->state) {
1769 case BT_CONNECT:
1770 case BT_CONNECT2:
1771 case BT_CONFIG:
1772 /* Already connecting */
1773 err = 0;
1774 goto done;
1775
1776 case BT_CONNECTED:
1777 /* Already connected */
1778 err = -EISCONN;
1779 goto done;
1780
1781 case BT_OPEN:
1782 case BT_BOUND:
1783 /* Can connect */
1784 break;
1785
1786 default:
1787 err = -EBADFD;
1788 goto done;
1789 }
1790
1791 /* Set destination address and psm */
1792 lock_sock(sk);
1793 bacpy(&bt_sk(sk)->dst, dst);
1794 release_sock(sk);
1795
1796 chan->psm = psm;
1797 chan->dcid = cid;
1798
1799 auth_type = l2cap_get_auth_type(chan);
1800
1801 if (bdaddr_type_is_le(dst_type))
1802 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
1803 chan->sec_level, auth_type);
1804 else
1805 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
1806 chan->sec_level, auth_type);
1807
1808 if (IS_ERR(hcon)) {
1809 err = PTR_ERR(hcon);
1810 goto done;
1811 }
1812
1813 conn = l2cap_conn_add(hcon);
1814 if (!conn) {
1815 hci_conn_drop(hcon);
1816 err = -ENOMEM;
1817 goto done;
1818 }
1819
1820 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
1821 hci_conn_drop(hcon);
1822 err = -EBUSY;
1823 goto done;
1824 }
1825
1826 /* Update source addr of the socket */
1827 bacpy(src, conn->src);
1828
1829 l2cap_chan_unlock(chan);
1830 l2cap_chan_add(conn, chan);
1831 l2cap_chan_lock(chan);
1832
1833 /* l2cap_chan_add takes its own ref so we can drop this one */
1834 hci_conn_drop(hcon);
1835
1836 l2cap_state_change(chan, BT_CONNECT);
1837 __set_chan_timer(chan, sk->sk_sndtimeo);
1838
1839 if (hcon->state == BT_CONNECTED) {
1840 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1841 __clear_chan_timer(chan);
1842 if (l2cap_chan_check_security(chan))
1843 l2cap_state_change(chan, BT_CONNECTED);
1844 } else
1845 l2cap_do_start(chan);
1846 }
1847
1848 err = 0;
1849
1850 done:
1851 l2cap_chan_unlock(chan);
1852 hci_dev_unlock(hdev);
1853 hci_dev_put(hdev);
1854 return err;
1855 }
1856
1857 int __l2cap_wait_ack(struct sock *sk)
1858 {
1859 struct l2cap_chan *chan = l2cap_pi(sk)->chan;
1860 DECLARE_WAITQUEUE(wait, current);
1861 int err = 0;
1862 int timeo = HZ/5;
1863
1864 add_wait_queue(sk_sleep(sk), &wait);
1865 set_current_state(TASK_INTERRUPTIBLE);
1866 while (chan->unacked_frames > 0 && chan->conn) {
1867 if (!timeo)
1868 timeo = HZ/5;
1869
1870 if (signal_pending(current)) {
1871 err = sock_intr_errno(timeo);
1872 break;
1873 }
1874
1875 release_sock(sk);
1876 timeo = schedule_timeout(timeo);
1877 lock_sock(sk);
1878 set_current_state(TASK_INTERRUPTIBLE);
1879
1880 err = sock_error(sk);
1881 if (err)
1882 break;
1883 }
1884 set_current_state(TASK_RUNNING);
1885 remove_wait_queue(sk_sleep(sk), &wait);
1886 return err;
1887 }
1888
1889 static void l2cap_monitor_timeout(struct work_struct *work)
1890 {
1891 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1892 monitor_timer.work);
1893
1894 BT_DBG("chan %p", chan);
1895
1896 l2cap_chan_lock(chan);
1897
1898 if (!chan->conn) {
1899 l2cap_chan_unlock(chan);
1900 l2cap_chan_put(chan);
1901 return;
1902 }
1903
1904 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
1905
1906 l2cap_chan_unlock(chan);
1907 l2cap_chan_put(chan);
1908 }
1909
1910 static void l2cap_retrans_timeout(struct work_struct *work)
1911 {
1912 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1913 retrans_timer.work);
1914
1915 BT_DBG("chan %p", chan);
1916
1917 l2cap_chan_lock(chan);
1918
1919 if (!chan->conn) {
1920 l2cap_chan_unlock(chan);
1921 l2cap_chan_put(chan);
1922 return;
1923 }
1924
1925 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
1926 l2cap_chan_unlock(chan);
1927 l2cap_chan_put(chan);
1928 }
1929
1930 static void l2cap_streaming_send(struct l2cap_chan *chan,
1931 struct sk_buff_head *skbs)
1932 {
1933 struct sk_buff *skb;
1934 struct l2cap_ctrl *control;
1935
1936 BT_DBG("chan %p, skbs %p", chan, skbs);
1937
1938 if (__chan_is_moving(chan))
1939 return;
1940
1941 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1942
1943 while (!skb_queue_empty(&chan->tx_q)) {
1944
1945 skb = skb_dequeue(&chan->tx_q);
1946
1947 bt_cb(skb)->control.retries = 1;
1948 control = &bt_cb(skb)->control;
1949
1950 control->reqseq = 0;
1951 control->txseq = chan->next_tx_seq;
1952
1953 __pack_control(chan, control, skb);
1954
1955 if (chan->fcs == L2CAP_FCS_CRC16) {
1956 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1957 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1958 }
1959
1960 l2cap_do_send(chan, skb);
1961
1962 BT_DBG("Sent txseq %u", control->txseq);
1963
1964 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1965 chan->frames_sent++;
1966 }
1967 }
1968
1969 static int l2cap_ertm_send(struct l2cap_chan *chan)
1970 {
1971 struct sk_buff *skb, *tx_skb;
1972 struct l2cap_ctrl *control;
1973 int sent = 0;
1974
1975 BT_DBG("chan %p", chan);
1976
1977 if (chan->state != BT_CONNECTED)
1978 return -ENOTCONN;
1979
1980 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1981 return 0;
1982
1983 if (__chan_is_moving(chan))
1984 return 0;
1985
1986 while (chan->tx_send_head &&
1987 chan->unacked_frames < chan->remote_tx_win &&
1988 chan->tx_state == L2CAP_TX_STATE_XMIT) {
1989
1990 skb = chan->tx_send_head;
1991
1992 bt_cb(skb)->control.retries = 1;
1993 control = &bt_cb(skb)->control;
1994
1995 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1996 control->final = 1;
1997
1998 control->reqseq = chan->buffer_seq;
1999 chan->last_acked_seq = chan->buffer_seq;
2000 control->txseq = chan->next_tx_seq;
2001
2002 __pack_control(chan, control, skb);
2003
2004 if (chan->fcs == L2CAP_FCS_CRC16) {
2005 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
2006 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
2007 }
2008
2009 /* Clone after data has been modified. Data is assumed to be
2010 read-only (for locking purposes) on cloned sk_buffs.
2011 */
2012 tx_skb = skb_clone(skb, GFP_KERNEL);
2013
2014 if (!tx_skb)
2015 break;
2016
2017 __set_retrans_timer(chan);
2018
2019 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
2020 chan->unacked_frames++;
2021 chan->frames_sent++;
2022 sent++;
2023
2024 if (skb_queue_is_last(&chan->tx_q, skb))
2025 chan->tx_send_head = NULL;
2026 else
2027 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
2028
2029 l2cap_do_send(chan, tx_skb);
2030 BT_DBG("Sent txseq %u", control->txseq);
2031 }
2032
2033 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
2034 chan->unacked_frames, skb_queue_len(&chan->tx_q));
2035
2036 return sent;
2037 }
2038
2039 static void l2cap_ertm_resend(struct l2cap_chan *chan)
2040 {
2041 struct l2cap_ctrl control;
2042 struct sk_buff *skb;
2043 struct sk_buff *tx_skb;
2044 u16 seq;
2045
2046 BT_DBG("chan %p", chan);
2047
2048 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2049 return;
2050
2051 if (__chan_is_moving(chan))
2052 return;
2053
2054 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
2055 seq = l2cap_seq_list_pop(&chan->retrans_list);
2056
2057 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
2058 if (!skb) {
2059 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2060 seq);
2061 continue;
2062 }
2063
2064 bt_cb(skb)->control.retries++;
2065 control = bt_cb(skb)->control;
2066
2067 if (chan->max_tx != 0 &&
2068 bt_cb(skb)->control.retries > chan->max_tx) {
2069 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
2070 l2cap_send_disconn_req(chan, ECONNRESET);
2071 l2cap_seq_list_clear(&chan->retrans_list);
2072 break;
2073 }
2074
2075 control.reqseq = chan->buffer_seq;
2076 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2077 control.final = 1;
2078 else
2079 control.final = 0;
2080
2081 if (skb_cloned(skb)) {
2082 /* Cloned sk_buffs are read-only, so we need a
2083 * writeable copy
2084 */
2085 tx_skb = skb_copy(skb, GFP_KERNEL);
2086 } else {
2087 tx_skb = skb_clone(skb, GFP_KERNEL);
2088 }
2089
2090 if (!tx_skb) {
2091 l2cap_seq_list_clear(&chan->retrans_list);
2092 break;
2093 }
2094
2095 /* Update skb contents */
2096 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2097 put_unaligned_le32(__pack_extended_control(&control),
2098 tx_skb->data + L2CAP_HDR_SIZE);
2099 } else {
2100 put_unaligned_le16(__pack_enhanced_control(&control),
2101 tx_skb->data + L2CAP_HDR_SIZE);
2102 }
2103
2104 if (chan->fcs == L2CAP_FCS_CRC16) {
2105 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2106 put_unaligned_le16(fcs, skb_put(tx_skb,
2107 L2CAP_FCS_SIZE));
2108 }
2109
2110 l2cap_do_send(chan, tx_skb);
2111
2112 BT_DBG("Resent txseq %d", control.txseq);
2113
2114 chan->last_acked_seq = chan->buffer_seq;
2115 }
2116 }
2117
2118 static void l2cap_retransmit(struct l2cap_chan *chan,
2119 struct l2cap_ctrl *control)
2120 {
2121 BT_DBG("chan %p, control %p", chan, control);
2122
2123 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2124 l2cap_ertm_resend(chan);
2125 }
2126
2127 static void l2cap_retransmit_all(struct l2cap_chan *chan,
2128 struct l2cap_ctrl *control)
2129 {
2130 struct sk_buff *skb;
2131
2132 BT_DBG("chan %p, control %p", chan, control);
2133
2134 if (control->poll)
2135 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2136
2137 l2cap_seq_list_clear(&chan->retrans_list);
2138
2139 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2140 return;
2141
2142 if (chan->unacked_frames) {
2143 skb_queue_walk(&chan->tx_q, skb) {
2144 if (bt_cb(skb)->control.txseq == control->reqseq ||
2145 skb == chan->tx_send_head)
2146 break;
2147 }
2148
2149 skb_queue_walk_from(&chan->tx_q, skb) {
2150 if (skb == chan->tx_send_head)
2151 break;
2152
2153 l2cap_seq_list_append(&chan->retrans_list,
2154 bt_cb(skb)->control.txseq);
2155 }
2156
2157 l2cap_ertm_resend(chan);
2158 }
2159 }
2160
2161 static void l2cap_send_ack(struct l2cap_chan *chan)
2162 {
2163 struct l2cap_ctrl control;
2164 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2165 chan->last_acked_seq);
2166 int threshold;
2167
2168 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2169 chan, chan->last_acked_seq, chan->buffer_seq);
2170
2171 memset(&control, 0, sizeof(control));
2172 control.sframe = 1;
2173
2174 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2175 chan->rx_state == L2CAP_RX_STATE_RECV) {
2176 __clear_ack_timer(chan);
2177 control.super = L2CAP_SUPER_RNR;
2178 control.reqseq = chan->buffer_seq;
2179 l2cap_send_sframe(chan, &control);
2180 } else {
2181 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2182 l2cap_ertm_send(chan);
2183 /* If any i-frames were sent, they included an ack */
2184 if (chan->buffer_seq == chan->last_acked_seq)
2185 frames_to_ack = 0;
2186 }
2187
2188 /* Ack now if the window is 3/4ths full.
2189 * Calculate without mul or div
2190 */
2191 threshold = chan->ack_win;
2192 threshold += threshold << 1;
2193 threshold >>= 2;
2194
2195 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
2196 threshold);
2197
2198 if (frames_to_ack >= threshold) {
2199 __clear_ack_timer(chan);
2200 control.super = L2CAP_SUPER_RR;
2201 control.reqseq = chan->buffer_seq;
2202 l2cap_send_sframe(chan, &control);
2203 frames_to_ack = 0;
2204 }
2205
2206 if (frames_to_ack)
2207 __set_ack_timer(chan);
2208 }
2209 }
2210
2211 static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2212 struct msghdr *msg, int len,
2213 int count, struct sk_buff *skb)
2214 {
2215 struct l2cap_conn *conn = chan->conn;
2216 struct sk_buff **frag;
2217 int sent = 0;
2218
2219 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
2220 return -EFAULT;
2221
2222 sent += count;
2223 len -= count;
2224
2225 /* Continuation fragments (no L2CAP header) */
2226 frag = &skb_shinfo(skb)->frag_list;
2227 while (len) {
2228 struct sk_buff *tmp;
2229
2230 count = min_t(unsigned int, conn->mtu, len);
2231
2232 tmp = chan->ops->alloc_skb(chan, count,
2233 msg->msg_flags & MSG_DONTWAIT);
2234 if (IS_ERR(tmp))
2235 return PTR_ERR(tmp);
2236
2237 *frag = tmp;
2238
2239 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2240 return -EFAULT;
2241
2242 (*frag)->priority = skb->priority;
2243
2244 sent += count;
2245 len -= count;
2246
2247 skb->len += (*frag)->len;
2248 skb->data_len += (*frag)->len;
2249
2250 frag = &(*frag)->next;
2251 }
2252
2253 return sent;
2254 }
2255
2256 static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
2257 struct msghdr *msg, size_t len,
2258 u32 priority)
2259 {
2260 struct l2cap_conn *conn = chan->conn;
2261 struct sk_buff *skb;
2262 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
2263 struct l2cap_hdr *lh;
2264
2265 BT_DBG("chan %p len %zu priority %u", chan, len, priority);
2266
2267 count = min_t(unsigned int, (conn->mtu - hlen), len);
2268
2269 skb = chan->ops->alloc_skb(chan, count + hlen,
2270 msg->msg_flags & MSG_DONTWAIT);
2271 if (IS_ERR(skb))
2272 return skb;
2273
2274 skb->priority = priority;
2275
2276 /* Create L2CAP header */
2277 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2278 lh->cid = cpu_to_le16(chan->dcid);
2279 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2280 put_unaligned(chan->psm, skb_put(skb, L2CAP_PSMLEN_SIZE));
2281
2282 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2283 if (unlikely(err < 0)) {
2284 kfree_skb(skb);
2285 return ERR_PTR(err);
2286 }
2287 return skb;
2288 }
2289
2290 static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
2291 struct msghdr *msg, size_t len,
2292 u32 priority)
2293 {
2294 struct l2cap_conn *conn = chan->conn;
2295 struct sk_buff *skb;
2296 int err, count;
2297 struct l2cap_hdr *lh;
2298
2299 BT_DBG("chan %p len %zu", chan, len);
2300
2301 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2302
2303 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
2304 msg->msg_flags & MSG_DONTWAIT);
2305 if (IS_ERR(skb))
2306 return skb;
2307
2308 skb->priority = priority;
2309
2310 /* Create L2CAP header */
2311 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2312 lh->cid = cpu_to_le16(chan->dcid);
2313 lh->len = cpu_to_le16(len);
2314
2315 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2316 if (unlikely(err < 0)) {
2317 kfree_skb(skb);
2318 return ERR_PTR(err);
2319 }
2320 return skb;
2321 }
2322
2323 static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
2324 struct msghdr *msg, size_t len,
2325 u16 sdulen)
2326 {
2327 struct l2cap_conn *conn = chan->conn;
2328 struct sk_buff *skb;
2329 int err, count, hlen;
2330 struct l2cap_hdr *lh;
2331
2332 BT_DBG("chan %p len %zu", chan, len);
2333
2334 if (!conn)
2335 return ERR_PTR(-ENOTCONN);
2336
2337 hlen = __ertm_hdr_size(chan);
2338
2339 if (sdulen)
2340 hlen += L2CAP_SDULEN_SIZE;
2341
2342 if (chan->fcs == L2CAP_FCS_CRC16)
2343 hlen += L2CAP_FCS_SIZE;
2344
2345 count = min_t(unsigned int, (conn->mtu - hlen), len);
2346
2347 skb = chan->ops->alloc_skb(chan, count + hlen,
2348 msg->msg_flags & MSG_DONTWAIT);
2349 if (IS_ERR(skb))
2350 return skb;
2351
2352 /* Create L2CAP header */
2353 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2354 lh->cid = cpu_to_le16(chan->dcid);
2355 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2356
2357 /* Control header is populated later */
2358 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2359 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2360 else
2361 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
2362
2363 if (sdulen)
2364 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2365
2366 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2367 if (unlikely(err < 0)) {
2368 kfree_skb(skb);
2369 return ERR_PTR(err);
2370 }
2371
2372 bt_cb(skb)->control.fcs = chan->fcs;
2373 bt_cb(skb)->control.retries = 0;
2374 return skb;
2375 }
2376
2377 static int l2cap_segment_sdu(struct l2cap_chan *chan,
2378 struct sk_buff_head *seg_queue,
2379 struct msghdr *msg, size_t len)
2380 {
2381 struct sk_buff *skb;
2382 u16 sdu_len;
2383 size_t pdu_len;
2384 u8 sar;
2385
2386 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2387
2388 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2389 * so fragmented skbs are not used. The HCI layer's handling
2390 * of fragmented skbs is not compatible with ERTM's queueing.
2391 */
2392
2393 /* PDU size is derived from the HCI MTU */
2394 pdu_len = chan->conn->mtu;
2395
2396 /* Constrain PDU size for BR/EDR connections */
2397 if (!chan->hs_hcon)
2398 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2399
2400 /* Adjust for largest possible L2CAP overhead. */
2401 if (chan->fcs)
2402 pdu_len -= L2CAP_FCS_SIZE;
2403
2404 pdu_len -= __ertm_hdr_size(chan);
2405
2406 /* Remote device may have requested smaller PDUs */
2407 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2408
2409 if (len <= pdu_len) {
2410 sar = L2CAP_SAR_UNSEGMENTED;
2411 sdu_len = 0;
2412 pdu_len = len;
2413 } else {
2414 sar = L2CAP_SAR_START;
2415 sdu_len = len;
2416 pdu_len -= L2CAP_SDULEN_SIZE;
2417 }
2418
2419 while (len > 0) {
2420 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
2421
2422 if (IS_ERR(skb)) {
2423 __skb_queue_purge(seg_queue);
2424 return PTR_ERR(skb);
2425 }
2426
2427 bt_cb(skb)->control.sar = sar;
2428 __skb_queue_tail(seg_queue, skb);
2429
2430 len -= pdu_len;
2431 if (sdu_len) {
2432 sdu_len = 0;
2433 pdu_len += L2CAP_SDULEN_SIZE;
2434 }
2435
2436 if (len <= pdu_len) {
2437 sar = L2CAP_SAR_END;
2438 pdu_len = len;
2439 } else {
2440 sar = L2CAP_SAR_CONTINUE;
2441 }
2442 }
2443
2444 return 0;
2445 }
2446
2447 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2448 u32 priority)
2449 {
2450 struct sk_buff *skb;
2451 int err;
2452 struct sk_buff_head seg_queue;
2453
2454 /* Connectionless channel */
2455 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
2456 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
2457 if (IS_ERR(skb))
2458 return PTR_ERR(skb);
2459
2460 l2cap_do_send(chan, skb);
2461 return len;
2462 }
2463
2464 switch (chan->mode) {
2465 case L2CAP_MODE_BASIC:
2466 /* Check outgoing MTU */
2467 if (len > chan->omtu)
2468 return -EMSGSIZE;
2469
2470 /* Create a basic PDU */
2471 skb = l2cap_create_basic_pdu(chan, msg, len, priority);
2472 if (IS_ERR(skb))
2473 return PTR_ERR(skb);
2474
2475 l2cap_do_send(chan, skb);
2476 err = len;
2477 break;
2478
2479 case L2CAP_MODE_ERTM:
2480 case L2CAP_MODE_STREAMING:
2481 /* Check outgoing MTU */
2482 if (len > chan->omtu) {
2483 err = -EMSGSIZE;
2484 break;
2485 }
2486
2487 __skb_queue_head_init(&seg_queue);
2488
2489 /* Do segmentation before calling in to the state machine,
2490 * since it's possible to block while waiting for memory
2491 * allocation.
2492 */
2493 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
2494
2495 /* The channel could have been closed while segmenting,
2496 * check that it is still connected.
2497 */
2498 if (chan->state != BT_CONNECTED) {
2499 __skb_queue_purge(&seg_queue);
2500 err = -ENOTCONN;
2501 }
2502
2503 if (err)
2504 break;
2505
2506 if (chan->mode == L2CAP_MODE_ERTM)
2507 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
2508 else
2509 l2cap_streaming_send(chan, &seg_queue);
2510
2511 err = len;
2512
2513 /* If the skbs were not queued for sending, they'll still be in
2514 * seg_queue and need to be purged.
2515 */
2516 __skb_queue_purge(&seg_queue);
2517 break;
2518
2519 default:
2520 BT_DBG("bad state %1.1x", chan->mode);
2521 err = -EBADFD;
2522 }
2523
2524 return err;
2525 }
2526
2527 static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2528 {
2529 struct l2cap_ctrl control;
2530 u16 seq;
2531
2532 BT_DBG("chan %p, txseq %u", chan, txseq);
2533
2534 memset(&control, 0, sizeof(control));
2535 control.sframe = 1;
2536 control.super = L2CAP_SUPER_SREJ;
2537
2538 for (seq = chan->expected_tx_seq; seq != txseq;
2539 seq = __next_seq(chan, seq)) {
2540 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2541 control.reqseq = seq;
2542 l2cap_send_sframe(chan, &control);
2543 l2cap_seq_list_append(&chan->srej_list, seq);
2544 }
2545 }
2546
2547 chan->expected_tx_seq = __next_seq(chan, txseq);
2548 }
2549
2550 static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2551 {
2552 struct l2cap_ctrl control;
2553
2554 BT_DBG("chan %p", chan);
2555
2556 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2557 return;
2558
2559 memset(&control, 0, sizeof(control));
2560 control.sframe = 1;
2561 control.super = L2CAP_SUPER_SREJ;
2562 control.reqseq = chan->srej_list.tail;
2563 l2cap_send_sframe(chan, &control);
2564 }
2565
2566 static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2567 {
2568 struct l2cap_ctrl control;
2569 u16 initial_head;
2570 u16 seq;
2571
2572 BT_DBG("chan %p, txseq %u", chan, txseq);
2573
2574 memset(&control, 0, sizeof(control));
2575 control.sframe = 1;
2576 control.super = L2CAP_SUPER_SREJ;
2577
2578 /* Capture initial list head to allow only one pass through the list. */
2579 initial_head = chan->srej_list.head;
2580
2581 do {
2582 seq = l2cap_seq_list_pop(&chan->srej_list);
2583 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2584 break;
2585
2586 control.reqseq = seq;
2587 l2cap_send_sframe(chan, &control);
2588 l2cap_seq_list_append(&chan->srej_list, seq);
2589 } while (chan->srej_list.head != initial_head);
2590 }
2591
2592 static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2593 {
2594 struct sk_buff *acked_skb;
2595 u16 ackseq;
2596
2597 BT_DBG("chan %p, reqseq %u", chan, reqseq);
2598
2599 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2600 return;
2601
2602 BT_DBG("expected_ack_seq %u, unacked_frames %u",
2603 chan->expected_ack_seq, chan->unacked_frames);
2604
2605 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2606 ackseq = __next_seq(chan, ackseq)) {
2607
2608 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2609 if (acked_skb) {
2610 skb_unlink(acked_skb, &chan->tx_q);
2611 kfree_skb(acked_skb);
2612 chan->unacked_frames--;
2613 }
2614 }
2615
2616 chan->expected_ack_seq = reqseq;
2617
2618 if (chan->unacked_frames == 0)
2619 __clear_retrans_timer(chan);
2620
2621 BT_DBG("unacked_frames %u", chan->unacked_frames);
2622 }
2623
2624 static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2625 {
2626 BT_DBG("chan %p", chan);
2627
2628 chan->expected_tx_seq = chan->buffer_seq;
2629 l2cap_seq_list_clear(&chan->srej_list);
2630 skb_queue_purge(&chan->srej_q);
2631 chan->rx_state = L2CAP_RX_STATE_RECV;
2632 }
2633
2634 static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2635 struct l2cap_ctrl *control,
2636 struct sk_buff_head *skbs, u8 event)
2637 {
2638 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2639 event);
2640
2641 switch (event) {
2642 case L2CAP_EV_DATA_REQUEST:
2643 if (chan->tx_send_head == NULL)
2644 chan->tx_send_head = skb_peek(skbs);
2645
2646 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2647 l2cap_ertm_send(chan);
2648 break;
2649 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2650 BT_DBG("Enter LOCAL_BUSY");
2651 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2652
2653 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2654 /* The SREJ_SENT state must be aborted if we are to
2655 * enter the LOCAL_BUSY state.
2656 */
2657 l2cap_abort_rx_srej_sent(chan);
2658 }
2659
2660 l2cap_send_ack(chan);
2661
2662 break;
2663 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2664 BT_DBG("Exit LOCAL_BUSY");
2665 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2666
2667 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2668 struct l2cap_ctrl local_control;
2669
2670 memset(&local_control, 0, sizeof(local_control));
2671 local_control.sframe = 1;
2672 local_control.super = L2CAP_SUPER_RR;
2673 local_control.poll = 1;
2674 local_control.reqseq = chan->buffer_seq;
2675 l2cap_send_sframe(chan, &local_control);
2676
2677 chan->retry_count = 1;
2678 __set_monitor_timer(chan);
2679 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2680 }
2681 break;
2682 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2683 l2cap_process_reqseq(chan, control->reqseq);
2684 break;
2685 case L2CAP_EV_EXPLICIT_POLL:
2686 l2cap_send_rr_or_rnr(chan, 1);
2687 chan->retry_count = 1;
2688 __set_monitor_timer(chan);
2689 __clear_ack_timer(chan);
2690 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2691 break;
2692 case L2CAP_EV_RETRANS_TO:
2693 l2cap_send_rr_or_rnr(chan, 1);
2694 chan->retry_count = 1;
2695 __set_monitor_timer(chan);
2696 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2697 break;
2698 case L2CAP_EV_RECV_FBIT:
2699 /* Nothing to process */
2700 break;
2701 default:
2702 break;
2703 }
2704 }
2705
2706 static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2707 struct l2cap_ctrl *control,
2708 struct sk_buff_head *skbs, u8 event)
2709 {
2710 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2711 event);
2712
2713 switch (event) {
2714 case L2CAP_EV_DATA_REQUEST:
2715 if (chan->tx_send_head == NULL)
2716 chan->tx_send_head = skb_peek(skbs);
2717 /* Queue data, but don't send. */
2718 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2719 break;
2720 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2721 BT_DBG("Enter LOCAL_BUSY");
2722 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2723
2724 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2725 /* The SREJ_SENT state must be aborted if we are to
2726 * enter the LOCAL_BUSY state.
2727 */
2728 l2cap_abort_rx_srej_sent(chan);
2729 }
2730
2731 l2cap_send_ack(chan);
2732
2733 break;
2734 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2735 BT_DBG("Exit LOCAL_BUSY");
2736 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2737
2738 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2739 struct l2cap_ctrl local_control;
2740 memset(&local_control, 0, sizeof(local_control));
2741 local_control.sframe = 1;
2742 local_control.super = L2CAP_SUPER_RR;
2743 local_control.poll = 1;
2744 local_control.reqseq = chan->buffer_seq;
2745 l2cap_send_sframe(chan, &local_control);
2746
2747 chan->retry_count = 1;
2748 __set_monitor_timer(chan);
2749 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2750 }
2751 break;
2752 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2753 l2cap_process_reqseq(chan, control->reqseq);
2754
2755 /* Fall through */
2756
2757 case L2CAP_EV_RECV_FBIT:
2758 if (control && control->final) {
2759 __clear_monitor_timer(chan);
2760 if (chan->unacked_frames > 0)
2761 __set_retrans_timer(chan);
2762 chan->retry_count = 0;
2763 chan->tx_state = L2CAP_TX_STATE_XMIT;
2764 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2765 }
2766 break;
2767 case L2CAP_EV_EXPLICIT_POLL:
2768 /* Ignore */
2769 break;
2770 case L2CAP_EV_MONITOR_TO:
2771 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2772 l2cap_send_rr_or_rnr(chan, 1);
2773 __set_monitor_timer(chan);
2774 chan->retry_count++;
2775 } else {
2776 l2cap_send_disconn_req(chan, ECONNABORTED);
2777 }
2778 break;
2779 default:
2780 break;
2781 }
2782 }
2783
2784 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2785 struct sk_buff_head *skbs, u8 event)
2786 {
2787 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2788 chan, control, skbs, event, chan->tx_state);
2789
2790 switch (chan->tx_state) {
2791 case L2CAP_TX_STATE_XMIT:
2792 l2cap_tx_state_xmit(chan, control, skbs, event);
2793 break;
2794 case L2CAP_TX_STATE_WAIT_F:
2795 l2cap_tx_state_wait_f(chan, control, skbs, event);
2796 break;
2797 default:
2798 /* Ignore event */
2799 break;
2800 }
2801 }
2802
2803 static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2804 struct l2cap_ctrl *control)
2805 {
2806 BT_DBG("chan %p, control %p", chan, control);
2807 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
2808 }
2809
2810 static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2811 struct l2cap_ctrl *control)
2812 {
2813 BT_DBG("chan %p, control %p", chan, control);
2814 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
2815 }
2816
2817 /* Copy frame to all raw sockets on that connection */
2818 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2819 {
2820 struct sk_buff *nskb;
2821 struct l2cap_chan *chan;
2822
2823 BT_DBG("conn %p", conn);
2824
2825 mutex_lock(&conn->chan_lock);
2826
2827 list_for_each_entry(chan, &conn->chan_l, list) {
2828 struct sock *sk = chan->sk;
2829 if (chan->chan_type != L2CAP_CHAN_RAW)
2830 continue;
2831
2832 /* Don't send frame to the socket it came from */
2833 if (skb->sk == sk)
2834 continue;
2835 nskb = skb_clone(skb, GFP_KERNEL);
2836 if (!nskb)
2837 continue;
2838
2839 if (chan->ops->recv(chan, nskb))
2840 kfree_skb(nskb);
2841 }
2842
2843 mutex_unlock(&conn->chan_lock);
2844 }
2845
2846 /* ---- L2CAP signalling commands ---- */
2847 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2848 u8 ident, u16 dlen, void *data)
2849 {
2850 struct sk_buff *skb, **frag;
2851 struct l2cap_cmd_hdr *cmd;
2852 struct l2cap_hdr *lh;
2853 int len, count;
2854
2855 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2856 conn, code, ident, dlen);
2857
2858 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2859 return NULL;
2860
2861 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2862 count = min_t(unsigned int, conn->mtu, len);
2863
2864 skb = bt_skb_alloc(count, GFP_KERNEL);
2865 if (!skb)
2866 return NULL;
2867
2868 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2869 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
2870
2871 if (conn->hcon->type == LE_LINK)
2872 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
2873 else
2874 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
2875
2876 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2877 cmd->code = code;
2878 cmd->ident = ident;
2879 cmd->len = cpu_to_le16(dlen);
2880
2881 if (dlen) {
2882 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2883 memcpy(skb_put(skb, count), data, count);
2884 data += count;
2885 }
2886
2887 len -= skb->len;
2888
2889 /* Continuation fragments (no L2CAP header) */
2890 frag = &skb_shinfo(skb)->frag_list;
2891 while (len) {
2892 count = min_t(unsigned int, conn->mtu, len);
2893
2894 *frag = bt_skb_alloc(count, GFP_KERNEL);
2895 if (!*frag)
2896 goto fail;
2897
2898 memcpy(skb_put(*frag, count), data, count);
2899
2900 len -= count;
2901 data += count;
2902
2903 frag = &(*frag)->next;
2904 }
2905
2906 return skb;
2907
2908 fail:
2909 kfree_skb(skb);
2910 return NULL;
2911 }
2912
2913 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2914 unsigned long *val)
2915 {
2916 struct l2cap_conf_opt *opt = *ptr;
2917 int len;
2918
2919 len = L2CAP_CONF_OPT_SIZE + opt->len;
2920 *ptr += len;
2921
2922 *type = opt->type;
2923 *olen = opt->len;
2924
2925 switch (opt->len) {
2926 case 1:
2927 *val = *((u8 *) opt->val);
2928 break;
2929
2930 case 2:
2931 *val = get_unaligned_le16(opt->val);
2932 break;
2933
2934 case 4:
2935 *val = get_unaligned_le32(opt->val);
2936 break;
2937
2938 default:
2939 *val = (unsigned long) opt->val;
2940 break;
2941 }
2942
2943 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
2944 return len;
2945 }
2946
2947 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2948 {
2949 struct l2cap_conf_opt *opt = *ptr;
2950
2951 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
2952
2953 opt->type = type;
2954 opt->len = len;
2955
2956 switch (len) {
2957 case 1:
2958 *((u8 *) opt->val) = val;
2959 break;
2960
2961 case 2:
2962 put_unaligned_le16(val, opt->val);
2963 break;
2964
2965 case 4:
2966 put_unaligned_le32(val, opt->val);
2967 break;
2968
2969 default:
2970 memcpy(opt->val, (void *) val, len);
2971 break;
2972 }
2973
2974 *ptr += L2CAP_CONF_OPT_SIZE + len;
2975 }
2976
2977 static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2978 {
2979 struct l2cap_conf_efs efs;
2980
2981 switch (chan->mode) {
2982 case L2CAP_MODE_ERTM:
2983 efs.id = chan->local_id;
2984 efs.stype = chan->local_stype;
2985 efs.msdu = cpu_to_le16(chan->local_msdu);
2986 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2987 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2988 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
2989 break;
2990
2991 case L2CAP_MODE_STREAMING:
2992 efs.id = 1;
2993 efs.stype = L2CAP_SERV_BESTEFFORT;
2994 efs.msdu = cpu_to_le16(chan->local_msdu);
2995 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2996 efs.acc_lat = 0;
2997 efs.flush_to = 0;
2998 break;
2999
3000 default:
3001 return;
3002 }
3003
3004 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
3005 (unsigned long) &efs);
3006 }
3007
3008 static void l2cap_ack_timeout(struct work_struct *work)
3009 {
3010 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
3011 ack_timer.work);
3012 u16 frames_to_ack;
3013
3014 BT_DBG("chan %p", chan);
3015
3016 l2cap_chan_lock(chan);
3017
3018 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3019 chan->last_acked_seq);
3020
3021 if (frames_to_ack)
3022 l2cap_send_rr_or_rnr(chan, 0);
3023
3024 l2cap_chan_unlock(chan);
3025 l2cap_chan_put(chan);
3026 }
3027
3028 int l2cap_ertm_init(struct l2cap_chan *chan)
3029 {
3030 int err;
3031
3032 chan->next_tx_seq = 0;
3033 chan->expected_tx_seq = 0;
3034 chan->expected_ack_seq = 0;
3035 chan->unacked_frames = 0;
3036 chan->buffer_seq = 0;
3037 chan->frames_sent = 0;
3038 chan->last_acked_seq = 0;
3039 chan->sdu = NULL;
3040 chan->sdu_last_frag = NULL;
3041 chan->sdu_len = 0;
3042
3043 skb_queue_head_init(&chan->tx_q);
3044
3045 chan->local_amp_id = 0;
3046 chan->move_id = 0;
3047 chan->move_state = L2CAP_MOVE_STABLE;
3048 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3049
3050 if (chan->mode != L2CAP_MODE_ERTM)
3051 return 0;
3052
3053 chan->rx_state = L2CAP_RX_STATE_RECV;
3054 chan->tx_state = L2CAP_TX_STATE_XMIT;
3055
3056 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3057 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3058 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
3059
3060 skb_queue_head_init(&chan->srej_q);
3061
3062 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3063 if (err < 0)
3064 return err;
3065
3066 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3067 if (err < 0)
3068 l2cap_seq_list_free(&chan->srej_list);
3069
3070 return err;
3071 }
3072
3073 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3074 {
3075 switch (mode) {
3076 case L2CAP_MODE_STREAMING:
3077 case L2CAP_MODE_ERTM:
3078 if (l2cap_mode_supported(mode, remote_feat_mask))
3079 return mode;
3080 /* fall through */
3081 default:
3082 return L2CAP_MODE_BASIC;
3083 }
3084 }
3085
3086 static inline bool __l2cap_ews_supported(struct l2cap_chan *chan)
3087 {
3088 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
3089 }
3090
3091 static inline bool __l2cap_efs_supported(struct l2cap_chan *chan)
3092 {
3093 return enable_hs && chan->conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
3094 }
3095
3096 static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3097 struct l2cap_conf_rfc *rfc)
3098 {
3099 if (chan->local_amp_id && chan->hs_hcon) {
3100 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3101
3102 /* Class 1 devices have must have ERTM timeouts
3103 * exceeding the Link Supervision Timeout. The
3104 * default Link Supervision Timeout for AMP
3105 * controllers is 10 seconds.
3106 *
3107 * Class 1 devices use 0xffffffff for their
3108 * best-effort flush timeout, so the clamping logic
3109 * will result in a timeout that meets the above
3110 * requirement. ERTM timeouts are 16-bit values, so
3111 * the maximum timeout is 65.535 seconds.
3112 */
3113
3114 /* Convert timeout to milliseconds and round */
3115 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3116
3117 /* This is the recommended formula for class 2 devices
3118 * that start ERTM timers when packets are sent to the
3119 * controller.
3120 */
3121 ertm_to = 3 * ertm_to + 500;
3122
3123 if (ertm_to > 0xffff)
3124 ertm_to = 0xffff;
3125
3126 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3127 rfc->monitor_timeout = rfc->retrans_timeout;
3128 } else {
3129 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3130 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3131 }
3132 }
3133
3134 static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3135 {
3136 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
3137 __l2cap_ews_supported(chan)) {
3138 /* use extended control field */
3139 set_bit(FLAG_EXT_CTRL, &chan->flags);
3140 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3141 } else {
3142 chan->tx_win = min_t(u16, chan->tx_win,
3143 L2CAP_DEFAULT_TX_WINDOW);
3144 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3145 }
3146 chan->ack_win = chan->tx_win;
3147 }
3148
3149 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
3150 {
3151 struct l2cap_conf_req *req = data;
3152 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
3153 void *ptr = req->data;
3154 u16 size;
3155
3156 BT_DBG("chan %p", chan);
3157
3158 if (chan->num_conf_req || chan->num_conf_rsp)
3159 goto done;
3160
3161 switch (chan->mode) {
3162 case L2CAP_MODE_STREAMING:
3163 case L2CAP_MODE_ERTM:
3164 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
3165 break;
3166
3167 if (__l2cap_efs_supported(chan))
3168 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3169
3170 /* fall through */
3171 default:
3172 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
3173 break;
3174 }
3175
3176 done:
3177 if (chan->imtu != L2CAP_DEFAULT_MTU)
3178 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
3179
3180 switch (chan->mode) {
3181 case L2CAP_MODE_BASIC:
3182 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
3183 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
3184 break;
3185
3186 rfc.mode = L2CAP_MODE_BASIC;
3187 rfc.txwin_size = 0;
3188 rfc.max_transmit = 0;
3189 rfc.retrans_timeout = 0;
3190 rfc.monitor_timeout = 0;
3191 rfc.max_pdu_size = 0;
3192
3193 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3194 (unsigned long) &rfc);
3195 break;
3196
3197 case L2CAP_MODE_ERTM:
3198 rfc.mode = L2CAP_MODE_ERTM;
3199 rfc.max_transmit = chan->max_tx;
3200
3201 __l2cap_set_ertm_timeouts(chan, &rfc);
3202
3203 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3204 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3205 L2CAP_FCS_SIZE);
3206 rfc.max_pdu_size = cpu_to_le16(size);
3207
3208 l2cap_txwin_setup(chan);
3209
3210 rfc.txwin_size = min_t(u16, chan->tx_win,
3211 L2CAP_DEFAULT_TX_WINDOW);
3212
3213 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3214 (unsigned long) &rfc);
3215
3216 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3217 l2cap_add_opt_efs(&ptr, chan);
3218
3219 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3220 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3221 chan->tx_win);
3222
3223 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3224 if (chan->fcs == L2CAP_FCS_NONE ||
3225 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3226 chan->fcs = L2CAP_FCS_NONE;
3227 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3228 chan->fcs);
3229 }
3230 break;
3231
3232 case L2CAP_MODE_STREAMING:
3233 l2cap_txwin_setup(chan);
3234 rfc.mode = L2CAP_MODE_STREAMING;
3235 rfc.txwin_size = 0;
3236 rfc.max_transmit = 0;
3237 rfc.retrans_timeout = 0;
3238 rfc.monitor_timeout = 0;
3239
3240 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3241 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3242 L2CAP_FCS_SIZE);
3243 rfc.max_pdu_size = cpu_to_le16(size);
3244
3245 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3246 (unsigned long) &rfc);
3247
3248 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3249 l2cap_add_opt_efs(&ptr, chan);
3250
3251 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3252 if (chan->fcs == L2CAP_FCS_NONE ||
3253 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3254 chan->fcs = L2CAP_FCS_NONE;
3255 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3256 chan->fcs);
3257 }
3258 break;
3259 }
3260
3261 req->dcid = cpu_to_le16(chan->dcid);
3262 req->flags = __constant_cpu_to_le16(0);
3263
3264 return ptr - data;
3265 }
3266
3267 static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
3268 {
3269 struct l2cap_conf_rsp *rsp = data;
3270 void *ptr = rsp->data;
3271 void *req = chan->conf_req;
3272 int len = chan->conf_len;
3273 int type, hint, olen;
3274 unsigned long val;
3275 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3276 struct l2cap_conf_efs efs;
3277 u8 remote_efs = 0;
3278 u16 mtu = L2CAP_DEFAULT_MTU;
3279 u16 result = L2CAP_CONF_SUCCESS;
3280 u16 size;
3281
3282 BT_DBG("chan %p", chan);
3283
3284 while (len >= L2CAP_CONF_OPT_SIZE) {
3285 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
3286
3287 hint = type & L2CAP_CONF_HINT;
3288 type &= L2CAP_CONF_MASK;
3289
3290 switch (type) {
3291 case L2CAP_CONF_MTU:
3292 mtu = val;
3293 break;
3294
3295 case L2CAP_CONF_FLUSH_TO:
3296 chan->flush_to = val;
3297 break;
3298
3299 case L2CAP_CONF_QOS:
3300 break;
3301
3302 case L2CAP_CONF_RFC:
3303 if (olen == sizeof(rfc))
3304 memcpy(&rfc, (void *) val, olen);
3305 break;
3306
3307 case L2CAP_CONF_FCS:
3308 if (val == L2CAP_FCS_NONE)
3309 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
3310 break;
3311
3312 case L2CAP_CONF_EFS:
3313 remote_efs = 1;
3314 if (olen == sizeof(efs))
3315 memcpy(&efs, (void *) val, olen);
3316 break;
3317
3318 case L2CAP_CONF_EWS:
3319 if (!enable_hs)
3320 return -ECONNREFUSED;
3321
3322 set_bit(FLAG_EXT_CTRL, &chan->flags);
3323 set_bit(CONF_EWS_RECV, &chan->conf_state);
3324 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3325 chan->remote_tx_win = val;
3326 break;
3327
3328 default:
3329 if (hint)
3330 break;
3331
3332 result = L2CAP_CONF_UNKNOWN;
3333 *((u8 *) ptr++) = type;
3334 break;
3335 }
3336 }
3337
3338 if (chan->num_conf_rsp || chan->num_conf_req > 1)
3339 goto done;
3340
3341 switch (chan->mode) {
3342 case L2CAP_MODE_STREAMING:
3343 case L2CAP_MODE_ERTM:
3344 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
3345 chan->mode = l2cap_select_mode(rfc.mode,
3346 chan->conn->feat_mask);
3347 break;
3348 }
3349
3350 if (remote_efs) {
3351 if (__l2cap_efs_supported(chan))
3352 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3353 else
3354 return -ECONNREFUSED;
3355 }
3356
3357 if (chan->mode != rfc.mode)
3358 return -ECONNREFUSED;
3359
3360 break;
3361 }
3362
3363 done:
3364 if (chan->mode != rfc.mode) {
3365 result = L2CAP_CONF_UNACCEPT;
3366 rfc.mode = chan->mode;
3367
3368 if (chan->num_conf_rsp == 1)
3369 return -ECONNREFUSED;
3370
3371 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3372 (unsigned long) &rfc);
3373 }
3374
3375 if (result == L2CAP_CONF_SUCCESS) {
3376 /* Configure output options and let the other side know
3377 * which ones we don't like. */
3378
3379 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3380 result = L2CAP_CONF_UNACCEPT;
3381 else {
3382 chan->omtu = mtu;
3383 set_bit(CONF_MTU_DONE, &chan->conf_state);
3384 }
3385 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
3386
3387 if (remote_efs) {
3388 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3389 efs.stype != L2CAP_SERV_NOTRAFIC &&
3390 efs.stype != chan->local_stype) {
3391
3392 result = L2CAP_CONF_UNACCEPT;
3393
3394 if (chan->num_conf_req >= 1)
3395 return -ECONNREFUSED;
3396
3397 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3398 sizeof(efs),
3399 (unsigned long) &efs);
3400 } else {
3401 /* Send PENDING Conf Rsp */
3402 result = L2CAP_CONF_PENDING;
3403 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3404 }
3405 }
3406
3407 switch (rfc.mode) {
3408 case L2CAP_MODE_BASIC:
3409 chan->fcs = L2CAP_FCS_NONE;
3410 set_bit(CONF_MODE_DONE, &chan->conf_state);
3411 break;
3412
3413 case L2CAP_MODE_ERTM:
3414 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3415 chan->remote_tx_win = rfc.txwin_size;
3416 else
3417 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
3418
3419 chan->remote_max_tx = rfc.max_transmit;
3420
3421 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3422 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3423 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3424 rfc.max_pdu_size = cpu_to_le16(size);
3425 chan->remote_mps = size;
3426
3427 __l2cap_set_ertm_timeouts(chan, &rfc);
3428
3429 set_bit(CONF_MODE_DONE, &chan->conf_state);
3430
3431 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3432 sizeof(rfc), (unsigned long) &rfc);
3433
3434 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3435 chan->remote_id = efs.id;
3436 chan->remote_stype = efs.stype;
3437 chan->remote_msdu = le16_to_cpu(efs.msdu);
3438 chan->remote_flush_to =
3439 le32_to_cpu(efs.flush_to);
3440 chan->remote_acc_lat =
3441 le32_to_cpu(efs.acc_lat);
3442 chan->remote_sdu_itime =
3443 le32_to_cpu(efs.sdu_itime);
3444 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3445 sizeof(efs),
3446 (unsigned long) &efs);
3447 }
3448 break;
3449
3450 case L2CAP_MODE_STREAMING:
3451 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3452 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3453 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3454 rfc.max_pdu_size = cpu_to_le16(size);
3455 chan->remote_mps = size;
3456
3457 set_bit(CONF_MODE_DONE, &chan->conf_state);
3458
3459 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3460 (unsigned long) &rfc);
3461
3462 break;
3463
3464 default:
3465 result = L2CAP_CONF_UNACCEPT;
3466
3467 memset(&rfc, 0, sizeof(rfc));
3468 rfc.mode = chan->mode;
3469 }
3470
3471 if (result == L2CAP_CONF_SUCCESS)
3472 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3473 }
3474 rsp->scid = cpu_to_le16(chan->dcid);
3475 rsp->result = cpu_to_le16(result);
3476 rsp->flags = __constant_cpu_to_le16(0);
3477
3478 return ptr - data;
3479 }
3480
3481 static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3482 void *data, u16 *result)
3483 {
3484 struct l2cap_conf_req *req = data;
3485 void *ptr = req->data;
3486 int type, olen;
3487 unsigned long val;
3488 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3489 struct l2cap_conf_efs efs;
3490
3491 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
3492
3493 while (len >= L2CAP_CONF_OPT_SIZE) {
3494 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3495
3496 switch (type) {
3497 case L2CAP_CONF_MTU:
3498 if (val < L2CAP_DEFAULT_MIN_MTU) {
3499 *result = L2CAP_CONF_UNACCEPT;
3500 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
3501 } else
3502 chan->imtu = val;
3503 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
3504 break;
3505
3506 case L2CAP_CONF_FLUSH_TO:
3507 chan->flush_to = val;
3508 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
3509 2, chan->flush_to);
3510 break;
3511
3512 case L2CAP_CONF_RFC:
3513 if (olen == sizeof(rfc))
3514 memcpy(&rfc, (void *)val, olen);
3515
3516 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
3517 rfc.mode != chan->mode)
3518 return -ECONNREFUSED;
3519
3520 chan->fcs = 0;
3521
3522 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3523 sizeof(rfc), (unsigned long) &rfc);
3524 break;
3525
3526 case L2CAP_CONF_EWS:
3527 chan->ack_win = min_t(u16, val, chan->ack_win);
3528 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3529 chan->tx_win);
3530 break;
3531
3532 case L2CAP_CONF_EFS:
3533 if (olen == sizeof(efs))
3534 memcpy(&efs, (void *)val, olen);
3535
3536 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3537 efs.stype != L2CAP_SERV_NOTRAFIC &&
3538 efs.stype != chan->local_stype)
3539 return -ECONNREFUSED;
3540
3541 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3542 (unsigned long) &efs);
3543 break;
3544
3545 case L2CAP_CONF_FCS:
3546 if (*result == L2CAP_CONF_PENDING)
3547 if (val == L2CAP_FCS_NONE)
3548 set_bit(CONF_RECV_NO_FCS,
3549 &chan->conf_state);
3550 break;
3551 }
3552 }
3553
3554 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
3555 return -ECONNREFUSED;
3556
3557 chan->mode = rfc.mode;
3558
3559 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
3560 switch (rfc.mode) {
3561 case L2CAP_MODE_ERTM:
3562 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3563 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3564 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3565 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3566 chan->ack_win = min_t(u16, chan->ack_win,
3567 rfc.txwin_size);
3568
3569 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3570 chan->local_msdu = le16_to_cpu(efs.msdu);
3571 chan->local_sdu_itime =
3572 le32_to_cpu(efs.sdu_itime);
3573 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3574 chan->local_flush_to =
3575 le32_to_cpu(efs.flush_to);
3576 }
3577 break;
3578
3579 case L2CAP_MODE_STREAMING:
3580 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3581 }
3582 }
3583
3584 req->dcid = cpu_to_le16(chan->dcid);
3585 req->flags = __constant_cpu_to_le16(0);
3586
3587 return ptr - data;
3588 }
3589
3590 static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3591 u16 result, u16 flags)
3592 {
3593 struct l2cap_conf_rsp *rsp = data;
3594 void *ptr = rsp->data;
3595
3596 BT_DBG("chan %p", chan);
3597
3598 rsp->scid = cpu_to_le16(chan->dcid);
3599 rsp->result = cpu_to_le16(result);
3600 rsp->flags = cpu_to_le16(flags);
3601
3602 return ptr - data;
3603 }
3604
3605 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
3606 {
3607 struct l2cap_conn_rsp rsp;
3608 struct l2cap_conn *conn = chan->conn;
3609 u8 buf[128];
3610 u8 rsp_code;
3611
3612 rsp.scid = cpu_to_le16(chan->dcid);
3613 rsp.dcid = cpu_to_le16(chan->scid);
3614 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3615 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
3616
3617 if (chan->hs_hcon)
3618 rsp_code = L2CAP_CREATE_CHAN_RSP;
3619 else
3620 rsp_code = L2CAP_CONN_RSP;
3621
3622 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3623
3624 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
3625
3626 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3627 return;
3628
3629 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3630 l2cap_build_conf_req(chan, buf), buf);
3631 chan->num_conf_req++;
3632 }
3633
3634 static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
3635 {
3636 int type, olen;
3637 unsigned long val;
3638 /* Use sane default values in case a misbehaving remote device
3639 * did not send an RFC or extended window size option.
3640 */
3641 u16 txwin_ext = chan->ack_win;
3642 struct l2cap_conf_rfc rfc = {
3643 .mode = chan->mode,
3644 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3645 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3646 .max_pdu_size = cpu_to_le16(chan->imtu),
3647 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3648 };
3649
3650 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
3651
3652 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
3653 return;
3654
3655 while (len >= L2CAP_CONF_OPT_SIZE) {
3656 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3657
3658 switch (type) {
3659 case L2CAP_CONF_RFC:
3660 if (olen == sizeof(rfc))
3661 memcpy(&rfc, (void *)val, olen);
3662 break;
3663 case L2CAP_CONF_EWS:
3664 txwin_ext = val;
3665 break;
3666 }
3667 }
3668
3669 switch (rfc.mode) {
3670 case L2CAP_MODE_ERTM:
3671 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3672 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3673 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3674 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3675 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3676 else
3677 chan->ack_win = min_t(u16, chan->ack_win,
3678 rfc.txwin_size);
3679 break;
3680 case L2CAP_MODE_STREAMING:
3681 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3682 }
3683 }
3684
3685 static inline int l2cap_command_rej(struct l2cap_conn *conn,
3686 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3687 u8 *data)
3688 {
3689 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
3690
3691 if (cmd_len < sizeof(*rej))
3692 return -EPROTO;
3693
3694 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
3695 return 0;
3696
3697 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
3698 cmd->ident == conn->info_ident) {
3699 cancel_delayed_work(&conn->info_timer);
3700
3701 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3702 conn->info_ident = 0;
3703
3704 l2cap_conn_start(conn);
3705 }
3706
3707 return 0;
3708 }
3709
3710 static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3711 struct l2cap_cmd_hdr *cmd,
3712 u8 *data, u8 rsp_code, u8 amp_id)
3713 {
3714 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3715 struct l2cap_conn_rsp rsp;
3716 struct l2cap_chan *chan = NULL, *pchan;
3717 struct sock *parent, *sk = NULL;
3718 int result, status = L2CAP_CS_NO_INFO;
3719
3720 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
3721 __le16 psm = req->psm;
3722
3723 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
3724
3725 /* Check if we have socket listening on psm */
3726 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, conn->src, conn->dst);
3727 if (!pchan) {
3728 result = L2CAP_CR_BAD_PSM;
3729 goto sendresp;
3730 }
3731
3732 parent = pchan->sk;
3733
3734 mutex_lock(&conn->chan_lock);
3735 lock_sock(parent);
3736
3737 /* Check if the ACL is secure enough (if not SDP) */
3738 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
3739 !hci_conn_check_link_mode(conn->hcon)) {
3740 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
3741 result = L2CAP_CR_SEC_BLOCK;
3742 goto response;
3743 }
3744
3745 result = L2CAP_CR_NO_MEM;
3746
3747 /* Check if we already have channel with that dcid */
3748 if (__l2cap_get_chan_by_dcid(conn, scid))
3749 goto response;
3750
3751 chan = pchan->ops->new_connection(pchan);
3752 if (!chan)
3753 goto response;
3754
3755 sk = chan->sk;
3756
3757 bacpy(&bt_sk(sk)->src, conn->src);
3758 bacpy(&bt_sk(sk)->dst, conn->dst);
3759 chan->psm = psm;
3760 chan->dcid = scid;
3761 chan->local_amp_id = amp_id;
3762
3763 __l2cap_chan_add(conn, chan);
3764
3765 dcid = chan->scid;
3766
3767 __set_chan_timer(chan, sk->sk_sndtimeo);
3768
3769 chan->ident = cmd->ident;
3770
3771 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
3772 if (l2cap_chan_check_security(chan)) {
3773 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
3774 __l2cap_state_change(chan, BT_CONNECT2);
3775 result = L2CAP_CR_PEND;
3776 status = L2CAP_CS_AUTHOR_PEND;
3777 chan->ops->defer(chan);
3778 } else {
3779 /* Force pending result for AMP controllers.
3780 * The connection will succeed after the
3781 * physical link is up.
3782 */
3783 if (amp_id) {
3784 __l2cap_state_change(chan, BT_CONNECT2);
3785 result = L2CAP_CR_PEND;
3786 } else {
3787 __l2cap_state_change(chan, BT_CONFIG);
3788 result = L2CAP_CR_SUCCESS;
3789 }
3790 status = L2CAP_CS_NO_INFO;
3791 }
3792 } else {
3793 __l2cap_state_change(chan, BT_CONNECT2);
3794 result = L2CAP_CR_PEND;
3795 status = L2CAP_CS_AUTHEN_PEND;
3796 }
3797 } else {
3798 __l2cap_state_change(chan, BT_CONNECT2);
3799 result = L2CAP_CR_PEND;
3800 status = L2CAP_CS_NO_INFO;
3801 }
3802
3803 response:
3804 release_sock(parent);
3805 mutex_unlock(&conn->chan_lock);
3806
3807 sendresp:
3808 rsp.scid = cpu_to_le16(scid);
3809 rsp.dcid = cpu_to_le16(dcid);
3810 rsp.result = cpu_to_le16(result);
3811 rsp.status = cpu_to_le16(status);
3812 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
3813
3814 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3815 struct l2cap_info_req info;
3816 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
3817
3818 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3819 conn->info_ident = l2cap_get_ident(conn);
3820
3821 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
3822
3823 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3824 sizeof(info), &info);
3825 }
3826
3827 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
3828 result == L2CAP_CR_SUCCESS) {
3829 u8 buf[128];
3830 set_bit(CONF_REQ_SENT, &chan->conf_state);
3831 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3832 l2cap_build_conf_req(chan, buf), buf);
3833 chan->num_conf_req++;
3834 }
3835
3836 return chan;
3837 }
3838
3839 static int l2cap_connect_req(struct l2cap_conn *conn,
3840 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3841 {
3842 struct hci_dev *hdev = conn->hcon->hdev;
3843 struct hci_conn *hcon = conn->hcon;
3844
3845 if (cmd_len < sizeof(struct l2cap_conn_req))
3846 return -EPROTO;
3847
3848 hci_dev_lock(hdev);
3849 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3850 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3851 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3852 hcon->dst_type, 0, NULL, 0,
3853 hcon->dev_class);
3854 hci_dev_unlock(hdev);
3855
3856 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
3857 return 0;
3858 }
3859
3860 static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
3861 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3862 u8 *data)
3863 {
3864 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3865 u16 scid, dcid, result, status;
3866 struct l2cap_chan *chan;
3867 u8 req[128];
3868 int err;
3869
3870 if (cmd_len < sizeof(*rsp))
3871 return -EPROTO;
3872
3873 scid = __le16_to_cpu(rsp->scid);
3874 dcid = __le16_to_cpu(rsp->dcid);
3875 result = __le16_to_cpu(rsp->result);
3876 status = __le16_to_cpu(rsp->status);
3877
3878 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3879 dcid, scid, result, status);
3880
3881 mutex_lock(&conn->chan_lock);
3882
3883 if (scid) {
3884 chan = __l2cap_get_chan_by_scid(conn, scid);
3885 if (!chan) {
3886 err = -EFAULT;
3887 goto unlock;
3888 }
3889 } else {
3890 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3891 if (!chan) {
3892 err = -EFAULT;
3893 goto unlock;
3894 }
3895 }
3896
3897 err = 0;
3898
3899 l2cap_chan_lock(chan);
3900
3901 switch (result) {
3902 case L2CAP_CR_SUCCESS:
3903 l2cap_state_change(chan, BT_CONFIG);
3904 chan->ident = 0;
3905 chan->dcid = dcid;
3906 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
3907
3908 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3909 break;
3910
3911 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3912 l2cap_build_conf_req(chan, req), req);
3913 chan->num_conf_req++;
3914 break;
3915
3916 case L2CAP_CR_PEND:
3917 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
3918 break;
3919
3920 default:
3921 l2cap_chan_del(chan, ECONNREFUSED);
3922 break;
3923 }
3924
3925 l2cap_chan_unlock(chan);
3926
3927 unlock:
3928 mutex_unlock(&conn->chan_lock);
3929
3930 return err;
3931 }
3932
3933 static inline void set_default_fcs(struct l2cap_chan *chan)
3934 {
3935 /* FCS is enabled only in ERTM or streaming mode, if one or both
3936 * sides request it.
3937 */
3938 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
3939 chan->fcs = L2CAP_FCS_NONE;
3940 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
3941 chan->fcs = L2CAP_FCS_CRC16;
3942 }
3943
3944 static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3945 u8 ident, u16 flags)
3946 {
3947 struct l2cap_conn *conn = chan->conn;
3948
3949 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3950 flags);
3951
3952 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3953 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3954
3955 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3956 l2cap_build_conf_rsp(chan, data,
3957 L2CAP_CONF_SUCCESS, flags), data);
3958 }
3959
3960 static inline int l2cap_config_req(struct l2cap_conn *conn,
3961 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3962 u8 *data)
3963 {
3964 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3965 u16 dcid, flags;
3966 u8 rsp[64];
3967 struct l2cap_chan *chan;
3968 int len, err = 0;
3969
3970 if (cmd_len < sizeof(*req))
3971 return -EPROTO;
3972
3973 dcid = __le16_to_cpu(req->dcid);
3974 flags = __le16_to_cpu(req->flags);
3975
3976 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3977
3978 chan = l2cap_get_chan_by_scid(conn, dcid);
3979 if (!chan)
3980 return -ENOENT;
3981
3982 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
3983 struct l2cap_cmd_rej_cid rej;
3984
3985 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
3986 rej.scid = cpu_to_le16(chan->scid);
3987 rej.dcid = cpu_to_le16(chan->dcid);
3988
3989 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
3990 sizeof(rej), &rej);
3991 goto unlock;
3992 }
3993
3994 /* Reject if config buffer is too small. */
3995 len = cmd_len - sizeof(*req);
3996 if (chan->conf_len + len > sizeof(chan->conf_req)) {
3997 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
3998 l2cap_build_conf_rsp(chan, rsp,
3999 L2CAP_CONF_REJECT, flags), rsp);
4000 goto unlock;
4001 }
4002
4003 /* Store config. */
4004 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4005 chan->conf_len += len;
4006
4007 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
4008 /* Incomplete config. Send empty response. */
4009 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4010 l2cap_build_conf_rsp(chan, rsp,
4011 L2CAP_CONF_SUCCESS, flags), rsp);
4012 goto unlock;
4013 }
4014
4015 /* Complete config. */
4016 len = l2cap_parse_conf_req(chan, rsp);
4017 if (len < 0) {
4018 l2cap_send_disconn_req(chan, ECONNRESET);
4019 goto unlock;
4020 }
4021
4022 chan->ident = cmd->ident;
4023 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
4024 chan->num_conf_rsp++;
4025
4026 /* Reset config buffer. */
4027 chan->conf_len = 0;
4028
4029 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
4030 goto unlock;
4031
4032 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4033 set_default_fcs(chan);
4034
4035 if (chan->mode == L2CAP_MODE_ERTM ||
4036 chan->mode == L2CAP_MODE_STREAMING)
4037 err = l2cap_ertm_init(chan);
4038
4039 if (err < 0)
4040 l2cap_send_disconn_req(chan, -err);
4041 else
4042 l2cap_chan_ready(chan);
4043
4044 goto unlock;
4045 }
4046
4047 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
4048 u8 buf[64];
4049 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
4050 l2cap_build_conf_req(chan, buf), buf);
4051 chan->num_conf_req++;
4052 }
4053
4054 /* Got Conf Rsp PENDING from remote side and asume we sent
4055 Conf Rsp PENDING in the code above */
4056 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
4057 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4058
4059 /* check compatibility */
4060
4061 /* Send rsp for BR/EDR channel */
4062 if (!chan->hs_hcon)
4063 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4064 else
4065 chan->ident = cmd->ident;
4066 }
4067
4068 unlock:
4069 l2cap_chan_unlock(chan);
4070 return err;
4071 }
4072
4073 static inline int l2cap_config_rsp(struct l2cap_conn *conn,
4074 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4075 u8 *data)
4076 {
4077 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4078 u16 scid, flags, result;
4079 struct l2cap_chan *chan;
4080 int len = cmd_len - sizeof(*rsp);
4081 int err = 0;
4082
4083 if (cmd_len < sizeof(*rsp))
4084 return -EPROTO;
4085
4086 scid = __le16_to_cpu(rsp->scid);
4087 flags = __le16_to_cpu(rsp->flags);
4088 result = __le16_to_cpu(rsp->result);
4089
4090 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4091 result, len);
4092
4093 chan = l2cap_get_chan_by_scid(conn, scid);
4094 if (!chan)
4095 return 0;
4096
4097 switch (result) {
4098 case L2CAP_CONF_SUCCESS:
4099 l2cap_conf_rfc_get(chan, rsp->data, len);
4100 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4101 break;
4102
4103 case L2CAP_CONF_PENDING:
4104 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4105
4106 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4107 char buf[64];
4108
4109 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4110 buf, &result);
4111 if (len < 0) {
4112 l2cap_send_disconn_req(chan, ECONNRESET);
4113 goto done;
4114 }
4115
4116 if (!chan->hs_hcon) {
4117 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4118 0);
4119 } else {
4120 if (l2cap_check_efs(chan)) {
4121 amp_create_logical_link(chan);
4122 chan->ident = cmd->ident;
4123 }
4124 }
4125 }
4126 goto done;
4127
4128 case L2CAP_CONF_UNACCEPT:
4129 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
4130 char req[64];
4131
4132 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
4133 l2cap_send_disconn_req(chan, ECONNRESET);
4134 goto done;
4135 }
4136
4137 /* throw out any old stored conf requests */
4138 result = L2CAP_CONF_SUCCESS;
4139 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4140 req, &result);
4141 if (len < 0) {
4142 l2cap_send_disconn_req(chan, ECONNRESET);
4143 goto done;
4144 }
4145
4146 l2cap_send_cmd(conn, l2cap_get_ident(conn),
4147 L2CAP_CONF_REQ, len, req);
4148 chan->num_conf_req++;
4149 if (result != L2CAP_CONF_SUCCESS)
4150 goto done;
4151 break;
4152 }
4153
4154 default:
4155 l2cap_chan_set_err(chan, ECONNRESET);
4156
4157 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
4158 l2cap_send_disconn_req(chan, ECONNRESET);
4159 goto done;
4160 }
4161
4162 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
4163 goto done;
4164
4165 set_bit(CONF_INPUT_DONE, &chan->conf_state);
4166
4167 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
4168 set_default_fcs(chan);
4169
4170 if (chan->mode == L2CAP_MODE_ERTM ||
4171 chan->mode == L2CAP_MODE_STREAMING)
4172 err = l2cap_ertm_init(chan);
4173
4174 if (err < 0)
4175 l2cap_send_disconn_req(chan, -err);
4176 else
4177 l2cap_chan_ready(chan);
4178 }
4179
4180 done:
4181 l2cap_chan_unlock(chan);
4182 return err;
4183 }
4184
4185 static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4186 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4187 u8 *data)
4188 {
4189 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4190 struct l2cap_disconn_rsp rsp;
4191 u16 dcid, scid;
4192 struct l2cap_chan *chan;
4193 struct sock *sk;
4194
4195 if (cmd_len != sizeof(*req))
4196 return -EPROTO;
4197
4198 scid = __le16_to_cpu(req->scid);
4199 dcid = __le16_to_cpu(req->dcid);
4200
4201 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4202
4203 mutex_lock(&conn->chan_lock);
4204
4205 chan = __l2cap_get_chan_by_scid(conn, dcid);
4206 if (!chan) {
4207 mutex_unlock(&conn->chan_lock);
4208 return 0;
4209 }
4210
4211 l2cap_chan_lock(chan);
4212
4213 sk = chan->sk;
4214
4215 rsp.dcid = cpu_to_le16(chan->scid);
4216 rsp.scid = cpu_to_le16(chan->dcid);
4217 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4218
4219 lock_sock(sk);
4220 sk->sk_shutdown = SHUTDOWN_MASK;
4221 release_sock(sk);
4222
4223 l2cap_chan_hold(chan);
4224 l2cap_chan_del(chan, ECONNRESET);
4225
4226 l2cap_chan_unlock(chan);
4227
4228 chan->ops->close(chan);
4229 l2cap_chan_put(chan);
4230
4231 mutex_unlock(&conn->chan_lock);
4232
4233 return 0;
4234 }
4235
4236 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4237 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4238 u8 *data)
4239 {
4240 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4241 u16 dcid, scid;
4242 struct l2cap_chan *chan;
4243
4244 if (cmd_len != sizeof(*rsp))
4245 return -EPROTO;
4246
4247 scid = __le16_to_cpu(rsp->scid);
4248 dcid = __le16_to_cpu(rsp->dcid);
4249
4250 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4251
4252 mutex_lock(&conn->chan_lock);
4253
4254 chan = __l2cap_get_chan_by_scid(conn, scid);
4255 if (!chan) {
4256 mutex_unlock(&conn->chan_lock);
4257 return 0;
4258 }
4259
4260 l2cap_chan_lock(chan);
4261
4262 l2cap_chan_hold(chan);
4263 l2cap_chan_del(chan, 0);
4264
4265 l2cap_chan_unlock(chan);
4266
4267 chan->ops->close(chan);
4268 l2cap_chan_put(chan);
4269
4270 mutex_unlock(&conn->chan_lock);
4271
4272 return 0;
4273 }
4274
4275 static inline int l2cap_information_req(struct l2cap_conn *conn,
4276 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4277 u8 *data)
4278 {
4279 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
4280 u16 type;
4281
4282 if (cmd_len != sizeof(*req))
4283 return -EPROTO;
4284
4285 type = __le16_to_cpu(req->type);
4286
4287 BT_DBG("type 0x%4.4x", type);
4288
4289 if (type == L2CAP_IT_FEAT_MASK) {
4290 u8 buf[8];
4291 u32 feat_mask = l2cap_feat_mask;
4292 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4293 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4294 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
4295 if (!disable_ertm)
4296 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
4297 | L2CAP_FEAT_FCS;
4298 if (enable_hs)
4299 feat_mask |= L2CAP_FEAT_EXT_FLOW
4300 | L2CAP_FEAT_EXT_WINDOW;
4301
4302 put_unaligned_le32(feat_mask, rsp->data);
4303 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4304 buf);
4305 } else if (type == L2CAP_IT_FIXED_CHAN) {
4306 u8 buf[12];
4307 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4308
4309 if (enable_hs)
4310 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4311 else
4312 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4313
4314 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4315 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
4316 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
4317 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4318 buf);
4319 } else {
4320 struct l2cap_info_rsp rsp;
4321 rsp.type = cpu_to_le16(type);
4322 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
4323 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4324 &rsp);
4325 }
4326
4327 return 0;
4328 }
4329
4330 static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4331 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4332 u8 *data)
4333 {
4334 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4335 u16 type, result;
4336
4337 if (cmd_len < sizeof(*rsp))
4338 return -EPROTO;
4339
4340 type = __le16_to_cpu(rsp->type);
4341 result = __le16_to_cpu(rsp->result);
4342
4343 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4344
4345 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4346 if (cmd->ident != conn->info_ident ||
4347 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
4348 return 0;
4349
4350 cancel_delayed_work(&conn->info_timer);
4351
4352 if (result != L2CAP_IR_SUCCESS) {
4353 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4354 conn->info_ident = 0;
4355
4356 l2cap_conn_start(conn);
4357
4358 return 0;
4359 }
4360
4361 switch (type) {
4362 case L2CAP_IT_FEAT_MASK:
4363 conn->feat_mask = get_unaligned_le32(rsp->data);
4364
4365 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
4366 struct l2cap_info_req req;
4367 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4368
4369 conn->info_ident = l2cap_get_ident(conn);
4370
4371 l2cap_send_cmd(conn, conn->info_ident,
4372 L2CAP_INFO_REQ, sizeof(req), &req);
4373 } else {
4374 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4375 conn->info_ident = 0;
4376
4377 l2cap_conn_start(conn);
4378 }
4379 break;
4380
4381 case L2CAP_IT_FIXED_CHAN:
4382 conn->fixed_chan_mask = rsp->data[0];
4383 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4384 conn->info_ident = 0;
4385
4386 l2cap_conn_start(conn);
4387 break;
4388 }
4389
4390 return 0;
4391 }
4392
4393 static int l2cap_create_channel_req(struct l2cap_conn *conn,
4394 struct l2cap_cmd_hdr *cmd,
4395 u16 cmd_len, void *data)
4396 {
4397 struct l2cap_create_chan_req *req = data;
4398 struct l2cap_create_chan_rsp rsp;
4399 struct l2cap_chan *chan;
4400 struct hci_dev *hdev;
4401 u16 psm, scid;
4402
4403 if (cmd_len != sizeof(*req))
4404 return -EPROTO;
4405
4406 if (!enable_hs)
4407 return -EINVAL;
4408
4409 psm = le16_to_cpu(req->psm);
4410 scid = le16_to_cpu(req->scid);
4411
4412 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
4413
4414 /* For controller id 0 make BR/EDR connection */
4415 if (req->amp_id == HCI_BREDR_ID) {
4416 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4417 req->amp_id);
4418 return 0;
4419 }
4420
4421 /* Validate AMP controller id */
4422 hdev = hci_dev_get(req->amp_id);
4423 if (!hdev)
4424 goto error;
4425
4426 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4427 hci_dev_put(hdev);
4428 goto error;
4429 }
4430
4431 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4432 req->amp_id);
4433 if (chan) {
4434 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4435 struct hci_conn *hs_hcon;
4436
4437 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK, conn->dst);
4438 if (!hs_hcon) {
4439 hci_dev_put(hdev);
4440 return -EFAULT;
4441 }
4442
4443 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4444
4445 mgr->bredr_chan = chan;
4446 chan->hs_hcon = hs_hcon;
4447 chan->fcs = L2CAP_FCS_NONE;
4448 conn->mtu = hdev->block_mtu;
4449 }
4450
4451 hci_dev_put(hdev);
4452
4453 return 0;
4454
4455 error:
4456 rsp.dcid = 0;
4457 rsp.scid = cpu_to_le16(scid);
4458 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4459 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4460
4461 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4462 sizeof(rsp), &rsp);
4463
4464 return -EFAULT;
4465 }
4466
4467 static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4468 {
4469 struct l2cap_move_chan_req req;
4470 u8 ident;
4471
4472 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4473
4474 ident = l2cap_get_ident(chan->conn);
4475 chan->ident = ident;
4476
4477 req.icid = cpu_to_le16(chan->scid);
4478 req.dest_amp_id = dest_amp_id;
4479
4480 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4481 &req);
4482
4483 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4484 }
4485
4486 static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
4487 {
4488 struct l2cap_move_chan_rsp rsp;
4489
4490 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4491
4492 rsp.icid = cpu_to_le16(chan->dcid);
4493 rsp.result = cpu_to_le16(result);
4494
4495 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4496 sizeof(rsp), &rsp);
4497 }
4498
4499 static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
4500 {
4501 struct l2cap_move_chan_cfm cfm;
4502
4503 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4504
4505 chan->ident = l2cap_get_ident(chan->conn);
4506
4507 cfm.icid = cpu_to_le16(chan->scid);
4508 cfm.result = cpu_to_le16(result);
4509
4510 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4511 sizeof(cfm), &cfm);
4512
4513 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4514 }
4515
4516 static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4517 {
4518 struct l2cap_move_chan_cfm cfm;
4519
4520 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4521
4522 cfm.icid = cpu_to_le16(icid);
4523 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4524
4525 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4526 sizeof(cfm), &cfm);
4527 }
4528
4529 static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
4530 u16 icid)
4531 {
4532 struct l2cap_move_chan_cfm_rsp rsp;
4533
4534 BT_DBG("icid 0x%4.4x", icid);
4535
4536 rsp.icid = cpu_to_le16(icid);
4537 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4538 }
4539
4540 static void __release_logical_link(struct l2cap_chan *chan)
4541 {
4542 chan->hs_hchan = NULL;
4543 chan->hs_hcon = NULL;
4544
4545 /* Placeholder - release the logical link */
4546 }
4547
4548 static void l2cap_logical_fail(struct l2cap_chan *chan)
4549 {
4550 /* Logical link setup failed */
4551 if (chan->state != BT_CONNECTED) {
4552 /* Create channel failure, disconnect */
4553 l2cap_send_disconn_req(chan, ECONNRESET);
4554 return;
4555 }
4556
4557 switch (chan->move_role) {
4558 case L2CAP_MOVE_ROLE_RESPONDER:
4559 l2cap_move_done(chan);
4560 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4561 break;
4562 case L2CAP_MOVE_ROLE_INITIATOR:
4563 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4564 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4565 /* Remote has only sent pending or
4566 * success responses, clean up
4567 */
4568 l2cap_move_done(chan);
4569 }
4570
4571 /* Other amp move states imply that the move
4572 * has already aborted
4573 */
4574 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4575 break;
4576 }
4577 }
4578
4579 static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4580 struct hci_chan *hchan)
4581 {
4582 struct l2cap_conf_rsp rsp;
4583
4584 chan->hs_hchan = hchan;
4585 chan->hs_hcon->l2cap_data = chan->conn;
4586
4587 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
4588
4589 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4590 int err;
4591
4592 set_default_fcs(chan);
4593
4594 err = l2cap_ertm_init(chan);
4595 if (err < 0)
4596 l2cap_send_disconn_req(chan, -err);
4597 else
4598 l2cap_chan_ready(chan);
4599 }
4600 }
4601
4602 static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4603 struct hci_chan *hchan)
4604 {
4605 chan->hs_hcon = hchan->conn;
4606 chan->hs_hcon->l2cap_data = chan->conn;
4607
4608 BT_DBG("move_state %d", chan->move_state);
4609
4610 switch (chan->move_state) {
4611 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4612 /* Move confirm will be sent after a success
4613 * response is received
4614 */
4615 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4616 break;
4617 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4618 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4619 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4620 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4621 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4622 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4623 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4624 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4625 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4626 }
4627 break;
4628 default:
4629 /* Move was not in expected state, free the channel */
4630 __release_logical_link(chan);
4631
4632 chan->move_state = L2CAP_MOVE_STABLE;
4633 }
4634 }
4635
4636 /* Call with chan locked */
4637 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4638 u8 status)
4639 {
4640 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4641
4642 if (status) {
4643 l2cap_logical_fail(chan);
4644 __release_logical_link(chan);
4645 return;
4646 }
4647
4648 if (chan->state != BT_CONNECTED) {
4649 /* Ignore logical link if channel is on BR/EDR */
4650 if (chan->local_amp_id)
4651 l2cap_logical_finish_create(chan, hchan);
4652 } else {
4653 l2cap_logical_finish_move(chan, hchan);
4654 }
4655 }
4656
4657 void l2cap_move_start(struct l2cap_chan *chan)
4658 {
4659 BT_DBG("chan %p", chan);
4660
4661 if (chan->local_amp_id == HCI_BREDR_ID) {
4662 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4663 return;
4664 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4665 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4666 /* Placeholder - start physical link setup */
4667 } else {
4668 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4669 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4670 chan->move_id = 0;
4671 l2cap_move_setup(chan);
4672 l2cap_send_move_chan_req(chan, 0);
4673 }
4674 }
4675
4676 static void l2cap_do_create(struct l2cap_chan *chan, int result,
4677 u8 local_amp_id, u8 remote_amp_id)
4678 {
4679 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4680 local_amp_id, remote_amp_id);
4681
4682 chan->fcs = L2CAP_FCS_NONE;
4683
4684 /* Outgoing channel on AMP */
4685 if (chan->state == BT_CONNECT) {
4686 if (result == L2CAP_CR_SUCCESS) {
4687 chan->local_amp_id = local_amp_id;
4688 l2cap_send_create_chan_req(chan, remote_amp_id);
4689 } else {
4690 /* Revert to BR/EDR connect */
4691 l2cap_send_conn_req(chan);
4692 }
4693
4694 return;
4695 }
4696
4697 /* Incoming channel on AMP */
4698 if (__l2cap_no_conn_pending(chan)) {
4699 struct l2cap_conn_rsp rsp;
4700 char buf[128];
4701 rsp.scid = cpu_to_le16(chan->dcid);
4702 rsp.dcid = cpu_to_le16(chan->scid);
4703
4704 if (result == L2CAP_CR_SUCCESS) {
4705 /* Send successful response */
4706 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4707 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4708 } else {
4709 /* Send negative response */
4710 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4711 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4712 }
4713
4714 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4715 sizeof(rsp), &rsp);
4716
4717 if (result == L2CAP_CR_SUCCESS) {
4718 __l2cap_state_change(chan, BT_CONFIG);
4719 set_bit(CONF_REQ_SENT, &chan->conf_state);
4720 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4721 L2CAP_CONF_REQ,
4722 l2cap_build_conf_req(chan, buf), buf);
4723 chan->num_conf_req++;
4724 }
4725 }
4726 }
4727
4728 static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4729 u8 remote_amp_id)
4730 {
4731 l2cap_move_setup(chan);
4732 chan->move_id = local_amp_id;
4733 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4734
4735 l2cap_send_move_chan_req(chan, remote_amp_id);
4736 }
4737
4738 static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4739 {
4740 struct hci_chan *hchan = NULL;
4741
4742 /* Placeholder - get hci_chan for logical link */
4743
4744 if (hchan) {
4745 if (hchan->state == BT_CONNECTED) {
4746 /* Logical link is ready to go */
4747 chan->hs_hcon = hchan->conn;
4748 chan->hs_hcon->l2cap_data = chan->conn;
4749 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4750 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4751
4752 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4753 } else {
4754 /* Wait for logical link to be ready */
4755 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4756 }
4757 } else {
4758 /* Logical link not available */
4759 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4760 }
4761 }
4762
4763 static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4764 {
4765 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4766 u8 rsp_result;
4767 if (result == -EINVAL)
4768 rsp_result = L2CAP_MR_BAD_ID;
4769 else
4770 rsp_result = L2CAP_MR_NOT_ALLOWED;
4771
4772 l2cap_send_move_chan_rsp(chan, rsp_result);
4773 }
4774
4775 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4776 chan->move_state = L2CAP_MOVE_STABLE;
4777
4778 /* Restart data transmission */
4779 l2cap_ertm_send(chan);
4780 }
4781
4782 /* Invoke with locked chan */
4783 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
4784 {
4785 u8 local_amp_id = chan->local_amp_id;
4786 u8 remote_amp_id = chan->remote_amp_id;
4787
4788 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4789 chan, result, local_amp_id, remote_amp_id);
4790
4791 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4792 l2cap_chan_unlock(chan);
4793 return;
4794 }
4795
4796 if (chan->state != BT_CONNECTED) {
4797 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4798 } else if (result != L2CAP_MR_SUCCESS) {
4799 l2cap_do_move_cancel(chan, result);
4800 } else {
4801 switch (chan->move_role) {
4802 case L2CAP_MOVE_ROLE_INITIATOR:
4803 l2cap_do_move_initiate(chan, local_amp_id,
4804 remote_amp_id);
4805 break;
4806 case L2CAP_MOVE_ROLE_RESPONDER:
4807 l2cap_do_move_respond(chan, result);
4808 break;
4809 default:
4810 l2cap_do_move_cancel(chan, result);
4811 break;
4812 }
4813 }
4814 }
4815
4816 static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
4817 struct l2cap_cmd_hdr *cmd,
4818 u16 cmd_len, void *data)
4819 {
4820 struct l2cap_move_chan_req *req = data;
4821 struct l2cap_move_chan_rsp rsp;
4822 struct l2cap_chan *chan;
4823 u16 icid = 0;
4824 u16 result = L2CAP_MR_NOT_ALLOWED;
4825
4826 if (cmd_len != sizeof(*req))
4827 return -EPROTO;
4828
4829 icid = le16_to_cpu(req->icid);
4830
4831 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
4832
4833 if (!enable_hs)
4834 return -EINVAL;
4835
4836 chan = l2cap_get_chan_by_dcid(conn, icid);
4837 if (!chan) {
4838 rsp.icid = cpu_to_le16(icid);
4839 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4840 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4841 sizeof(rsp), &rsp);
4842 return 0;
4843 }
4844
4845 chan->ident = cmd->ident;
4846
4847 if (chan->scid < L2CAP_CID_DYN_START ||
4848 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4849 (chan->mode != L2CAP_MODE_ERTM &&
4850 chan->mode != L2CAP_MODE_STREAMING)) {
4851 result = L2CAP_MR_NOT_ALLOWED;
4852 goto send_move_response;
4853 }
4854
4855 if (chan->local_amp_id == req->dest_amp_id) {
4856 result = L2CAP_MR_SAME_ID;
4857 goto send_move_response;
4858 }
4859
4860 if (req->dest_amp_id) {
4861 struct hci_dev *hdev;
4862 hdev = hci_dev_get(req->dest_amp_id);
4863 if (!hdev || hdev->dev_type != HCI_AMP ||
4864 !test_bit(HCI_UP, &hdev->flags)) {
4865 if (hdev)
4866 hci_dev_put(hdev);
4867
4868 result = L2CAP_MR_BAD_ID;
4869 goto send_move_response;
4870 }
4871 hci_dev_put(hdev);
4872 }
4873
4874 /* Detect a move collision. Only send a collision response
4875 * if this side has "lost", otherwise proceed with the move.
4876 * The winner has the larger bd_addr.
4877 */
4878 if ((__chan_is_moving(chan) ||
4879 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4880 bacmp(conn->src, conn->dst) > 0) {
4881 result = L2CAP_MR_COLLISION;
4882 goto send_move_response;
4883 }
4884
4885 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4886 l2cap_move_setup(chan);
4887 chan->move_id = req->dest_amp_id;
4888 icid = chan->dcid;
4889
4890 if (!req->dest_amp_id) {
4891 /* Moving to BR/EDR */
4892 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4893 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4894 result = L2CAP_MR_PEND;
4895 } else {
4896 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4897 result = L2CAP_MR_SUCCESS;
4898 }
4899 } else {
4900 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4901 /* Placeholder - uncomment when amp functions are available */
4902 /*amp_accept_physical(chan, req->dest_amp_id);*/
4903 result = L2CAP_MR_PEND;
4904 }
4905
4906 send_move_response:
4907 l2cap_send_move_chan_rsp(chan, result);
4908
4909 l2cap_chan_unlock(chan);
4910
4911 return 0;
4912 }
4913
4914 static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4915 {
4916 struct l2cap_chan *chan;
4917 struct hci_chan *hchan = NULL;
4918
4919 chan = l2cap_get_chan_by_scid(conn, icid);
4920 if (!chan) {
4921 l2cap_send_move_chan_cfm_icid(conn, icid);
4922 return;
4923 }
4924
4925 __clear_chan_timer(chan);
4926 if (result == L2CAP_MR_PEND)
4927 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4928
4929 switch (chan->move_state) {
4930 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4931 /* Move confirm will be sent when logical link
4932 * is complete.
4933 */
4934 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4935 break;
4936 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4937 if (result == L2CAP_MR_PEND) {
4938 break;
4939 } else if (test_bit(CONN_LOCAL_BUSY,
4940 &chan->conn_state)) {
4941 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4942 } else {
4943 /* Logical link is up or moving to BR/EDR,
4944 * proceed with move
4945 */
4946 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4947 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4948 }
4949 break;
4950 case L2CAP_MOVE_WAIT_RSP:
4951 /* Moving to AMP */
4952 if (result == L2CAP_MR_SUCCESS) {
4953 /* Remote is ready, send confirm immediately
4954 * after logical link is ready
4955 */
4956 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4957 } else {
4958 /* Both logical link and move success
4959 * are required to confirm
4960 */
4961 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4962 }
4963
4964 /* Placeholder - get hci_chan for logical link */
4965 if (!hchan) {
4966 /* Logical link not available */
4967 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4968 break;
4969 }
4970
4971 /* If the logical link is not yet connected, do not
4972 * send confirmation.
4973 */
4974 if (hchan->state != BT_CONNECTED)
4975 break;
4976
4977 /* Logical link is already ready to go */
4978
4979 chan->hs_hcon = hchan->conn;
4980 chan->hs_hcon->l2cap_data = chan->conn;
4981
4982 if (result == L2CAP_MR_SUCCESS) {
4983 /* Can confirm now */
4984 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4985 } else {
4986 /* Now only need move success
4987 * to confirm
4988 */
4989 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4990 }
4991
4992 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4993 break;
4994 default:
4995 /* Any other amp move state means the move failed. */
4996 chan->move_id = chan->local_amp_id;
4997 l2cap_move_done(chan);
4998 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4999 }
5000
5001 l2cap_chan_unlock(chan);
5002 }
5003
5004 static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5005 u16 result)
5006 {
5007 struct l2cap_chan *chan;
5008
5009 chan = l2cap_get_chan_by_ident(conn, ident);
5010 if (!chan) {
5011 /* Could not locate channel, icid is best guess */
5012 l2cap_send_move_chan_cfm_icid(conn, icid);
5013 return;
5014 }
5015
5016 __clear_chan_timer(chan);
5017
5018 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5019 if (result == L2CAP_MR_COLLISION) {
5020 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5021 } else {
5022 /* Cleanup - cancel move */
5023 chan->move_id = chan->local_amp_id;
5024 l2cap_move_done(chan);
5025 }
5026 }
5027
5028 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5029
5030 l2cap_chan_unlock(chan);
5031 }
5032
5033 static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5034 struct l2cap_cmd_hdr *cmd,
5035 u16 cmd_len, void *data)
5036 {
5037 struct l2cap_move_chan_rsp *rsp = data;
5038 u16 icid, result;
5039
5040 if (cmd_len != sizeof(*rsp))
5041 return -EPROTO;
5042
5043 icid = le16_to_cpu(rsp->icid);
5044 result = le16_to_cpu(rsp->result);
5045
5046 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5047
5048 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5049 l2cap_move_continue(conn, icid, result);
5050 else
5051 l2cap_move_fail(conn, cmd->ident, icid, result);
5052
5053 return 0;
5054 }
5055
5056 static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5057 struct l2cap_cmd_hdr *cmd,
5058 u16 cmd_len, void *data)
5059 {
5060 struct l2cap_move_chan_cfm *cfm = data;
5061 struct l2cap_chan *chan;
5062 u16 icid, result;
5063
5064 if (cmd_len != sizeof(*cfm))
5065 return -EPROTO;
5066
5067 icid = le16_to_cpu(cfm->icid);
5068 result = le16_to_cpu(cfm->result);
5069
5070 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5071
5072 chan = l2cap_get_chan_by_dcid(conn, icid);
5073 if (!chan) {
5074 /* Spec requires a response even if the icid was not found */
5075 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5076 return 0;
5077 }
5078
5079 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5080 if (result == L2CAP_MC_CONFIRMED) {
5081 chan->local_amp_id = chan->move_id;
5082 if (!chan->local_amp_id)
5083 __release_logical_link(chan);
5084 } else {
5085 chan->move_id = chan->local_amp_id;
5086 }
5087
5088 l2cap_move_done(chan);
5089 }
5090
5091 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5092
5093 l2cap_chan_unlock(chan);
5094
5095 return 0;
5096 }
5097
5098 static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
5099 struct l2cap_cmd_hdr *cmd,
5100 u16 cmd_len, void *data)
5101 {
5102 struct l2cap_move_chan_cfm_rsp *rsp = data;
5103 struct l2cap_chan *chan;
5104 u16 icid;
5105
5106 if (cmd_len != sizeof(*rsp))
5107 return -EPROTO;
5108
5109 icid = le16_to_cpu(rsp->icid);
5110
5111 BT_DBG("icid 0x%4.4x", icid);
5112
5113 chan = l2cap_get_chan_by_scid(conn, icid);
5114 if (!chan)
5115 return 0;
5116
5117 __clear_chan_timer(chan);
5118
5119 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5120 chan->local_amp_id = chan->move_id;
5121
5122 if (!chan->local_amp_id && chan->hs_hchan)
5123 __release_logical_link(chan);
5124
5125 l2cap_move_done(chan);
5126 }
5127
5128 l2cap_chan_unlock(chan);
5129
5130 return 0;
5131 }
5132
5133 static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
5134 u16 to_multiplier)
5135 {
5136 u16 max_latency;
5137
5138 if (min > max || min < 6 || max > 3200)
5139 return -EINVAL;
5140
5141 if (to_multiplier < 10 || to_multiplier > 3200)
5142 return -EINVAL;
5143
5144 if (max >= to_multiplier * 8)
5145 return -EINVAL;
5146
5147 max_latency = (to_multiplier * 8 / max) - 1;
5148 if (latency > 499 || latency > max_latency)
5149 return -EINVAL;
5150
5151 return 0;
5152 }
5153
5154 static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
5155 struct l2cap_cmd_hdr *cmd,
5156 u8 *data)
5157 {
5158 struct hci_conn *hcon = conn->hcon;
5159 struct l2cap_conn_param_update_req *req;
5160 struct l2cap_conn_param_update_rsp rsp;
5161 u16 min, max, latency, to_multiplier, cmd_len;
5162 int err;
5163
5164 if (!(hcon->link_mode & HCI_LM_MASTER))
5165 return -EINVAL;
5166
5167 cmd_len = __le16_to_cpu(cmd->len);
5168 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5169 return -EPROTO;
5170
5171 req = (struct l2cap_conn_param_update_req *) data;
5172 min = __le16_to_cpu(req->min);
5173 max = __le16_to_cpu(req->max);
5174 latency = __le16_to_cpu(req->latency);
5175 to_multiplier = __le16_to_cpu(req->to_multiplier);
5176
5177 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
5178 min, max, latency, to_multiplier);
5179
5180 memset(&rsp, 0, sizeof(rsp));
5181
5182 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5183 if (err)
5184 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
5185 else
5186 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
5187
5188 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
5189 sizeof(rsp), &rsp);
5190
5191 if (!err)
5192 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5193
5194 return 0;
5195 }
5196
5197 static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
5198 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5199 u8 *data)
5200 {
5201 int err = 0;
5202
5203 switch (cmd->code) {
5204 case L2CAP_COMMAND_REJ:
5205 l2cap_command_rej(conn, cmd, cmd_len, data);
5206 break;
5207
5208 case L2CAP_CONN_REQ:
5209 err = l2cap_connect_req(conn, cmd, cmd_len, data);
5210 break;
5211
5212 case L2CAP_CONN_RSP:
5213 case L2CAP_CREATE_CHAN_RSP:
5214 err = l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
5215 break;
5216
5217 case L2CAP_CONF_REQ:
5218 err = l2cap_config_req(conn, cmd, cmd_len, data);
5219 break;
5220
5221 case L2CAP_CONF_RSP:
5222 err = l2cap_config_rsp(conn, cmd, cmd_len, data);
5223 break;
5224
5225 case L2CAP_DISCONN_REQ:
5226 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5227 break;
5228
5229 case L2CAP_DISCONN_RSP:
5230 err = l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5231 break;
5232
5233 case L2CAP_ECHO_REQ:
5234 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5235 break;
5236
5237 case L2CAP_ECHO_RSP:
5238 break;
5239
5240 case L2CAP_INFO_REQ:
5241 err = l2cap_information_req(conn, cmd, cmd_len, data);
5242 break;
5243
5244 case L2CAP_INFO_RSP:
5245 err = l2cap_information_rsp(conn, cmd, cmd_len, data);
5246 break;
5247
5248 case L2CAP_CREATE_CHAN_REQ:
5249 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5250 break;
5251
5252 case L2CAP_MOVE_CHAN_REQ:
5253 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5254 break;
5255
5256 case L2CAP_MOVE_CHAN_RSP:
5257 err = l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5258 break;
5259
5260 case L2CAP_MOVE_CHAN_CFM:
5261 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5262 break;
5263
5264 case L2CAP_MOVE_CHAN_CFM_RSP:
5265 err = l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5266 break;
5267
5268 default:
5269 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5270 err = -EINVAL;
5271 break;
5272 }
5273
5274 return err;
5275 }
5276
5277 static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
5278 struct l2cap_cmd_hdr *cmd, u8 *data)
5279 {
5280 switch (cmd->code) {
5281 case L2CAP_COMMAND_REJ:
5282 return 0;
5283
5284 case L2CAP_CONN_PARAM_UPDATE_REQ:
5285 return l2cap_conn_param_update_req(conn, cmd, data);
5286
5287 case L2CAP_CONN_PARAM_UPDATE_RSP:
5288 return 0;
5289
5290 default:
5291 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5292 return -EINVAL;
5293 }
5294 }
5295
5296 static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5297 struct sk_buff *skb)
5298 {
5299 u8 *data = skb->data;
5300 int len = skb->len;
5301 struct l2cap_cmd_hdr cmd;
5302 int err;
5303
5304 l2cap_raw_recv(conn, skb);
5305
5306 while (len >= L2CAP_CMD_HDR_SIZE) {
5307 u16 cmd_len;
5308 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5309 data += L2CAP_CMD_HDR_SIZE;
5310 len -= L2CAP_CMD_HDR_SIZE;
5311
5312 cmd_len = le16_to_cpu(cmd.len);
5313
5314 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5315 cmd.ident);
5316
5317 if (cmd_len > len || !cmd.ident) {
5318 BT_DBG("corrupted command");
5319 break;
5320 }
5321
5322 err = l2cap_le_sig_cmd(conn, &cmd, data);
5323 if (err) {
5324 struct l2cap_cmd_rej_unk rej;
5325
5326 BT_ERR("Wrong link type (%d)", err);
5327
5328 /* FIXME: Map err to a valid reason */
5329 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5330 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5331 sizeof(rej), &rej);
5332 }
5333
5334 data += cmd_len;
5335 len -= cmd_len;
5336 }
5337
5338 kfree_skb(skb);
5339 }
5340
5341 static inline void l2cap_sig_channel(struct l2cap_conn *conn,
5342 struct sk_buff *skb)
5343 {
5344 u8 *data = skb->data;
5345 int len = skb->len;
5346 struct l2cap_cmd_hdr cmd;
5347 int err;
5348
5349 l2cap_raw_recv(conn, skb);
5350
5351 while (len >= L2CAP_CMD_HDR_SIZE) {
5352 u16 cmd_len;
5353 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5354 data += L2CAP_CMD_HDR_SIZE;
5355 len -= L2CAP_CMD_HDR_SIZE;
5356
5357 cmd_len = le16_to_cpu(cmd.len);
5358
5359 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5360 cmd.ident);
5361
5362 if (cmd_len > len || !cmd.ident) {
5363 BT_DBG("corrupted command");
5364 break;
5365 }
5366
5367 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
5368 if (err) {
5369 struct l2cap_cmd_rej_unk rej;
5370
5371 BT_ERR("Wrong link type (%d)", err);
5372
5373 /* FIXME: Map err to a valid reason */
5374 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5375 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5376 sizeof(rej), &rej);
5377 }
5378
5379 data += cmd_len;
5380 len -= cmd_len;
5381 }
5382
5383 kfree_skb(skb);
5384 }
5385
5386 static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
5387 {
5388 u16 our_fcs, rcv_fcs;
5389 int hdr_size;
5390
5391 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5392 hdr_size = L2CAP_EXT_HDR_SIZE;
5393 else
5394 hdr_size = L2CAP_ENH_HDR_SIZE;
5395
5396 if (chan->fcs == L2CAP_FCS_CRC16) {
5397 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
5398 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5399 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5400
5401 if (our_fcs != rcv_fcs)
5402 return -EBADMSG;
5403 }
5404 return 0;
5405 }
5406
5407 static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
5408 {
5409 struct l2cap_ctrl control;
5410
5411 BT_DBG("chan %p", chan);
5412
5413 memset(&control, 0, sizeof(control));
5414 control.sframe = 1;
5415 control.final = 1;
5416 control.reqseq = chan->buffer_seq;
5417 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5418
5419 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5420 control.super = L2CAP_SUPER_RNR;
5421 l2cap_send_sframe(chan, &control);
5422 }
5423
5424 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5425 chan->unacked_frames > 0)
5426 __set_retrans_timer(chan);
5427
5428 /* Send pending iframes */
5429 l2cap_ertm_send(chan);
5430
5431 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
5432 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5433 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5434 * send it now.
5435 */
5436 control.super = L2CAP_SUPER_RR;
5437 l2cap_send_sframe(chan, &control);
5438 }
5439 }
5440
5441 static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5442 struct sk_buff **last_frag)
5443 {
5444 /* skb->len reflects data in skb as well as all fragments
5445 * skb->data_len reflects only data in fragments
5446 */
5447 if (!skb_has_frag_list(skb))
5448 skb_shinfo(skb)->frag_list = new_frag;
5449
5450 new_frag->next = NULL;
5451
5452 (*last_frag)->next = new_frag;
5453 *last_frag = new_frag;
5454
5455 skb->len += new_frag->len;
5456 skb->data_len += new_frag->len;
5457 skb->truesize += new_frag->truesize;
5458 }
5459
5460 static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5461 struct l2cap_ctrl *control)
5462 {
5463 int err = -EINVAL;
5464
5465 switch (control->sar) {
5466 case L2CAP_SAR_UNSEGMENTED:
5467 if (chan->sdu)
5468 break;
5469
5470 err = chan->ops->recv(chan, skb);
5471 break;
5472
5473 case L2CAP_SAR_START:
5474 if (chan->sdu)
5475 break;
5476
5477 chan->sdu_len = get_unaligned_le16(skb->data);
5478 skb_pull(skb, L2CAP_SDULEN_SIZE);
5479
5480 if (chan->sdu_len > chan->imtu) {
5481 err = -EMSGSIZE;
5482 break;
5483 }
5484
5485 if (skb->len >= chan->sdu_len)
5486 break;
5487
5488 chan->sdu = skb;
5489 chan->sdu_last_frag = skb;
5490
5491 skb = NULL;
5492 err = 0;
5493 break;
5494
5495 case L2CAP_SAR_CONTINUE:
5496 if (!chan->sdu)
5497 break;
5498
5499 append_skb_frag(chan->sdu, skb,
5500 &chan->sdu_last_frag);
5501 skb = NULL;
5502
5503 if (chan->sdu->len >= chan->sdu_len)
5504 break;
5505
5506 err = 0;
5507 break;
5508
5509 case L2CAP_SAR_END:
5510 if (!chan->sdu)
5511 break;
5512
5513 append_skb_frag(chan->sdu, skb,
5514 &chan->sdu_last_frag);
5515 skb = NULL;
5516
5517 if (chan->sdu->len != chan->sdu_len)
5518 break;
5519
5520 err = chan->ops->recv(chan, chan->sdu);
5521
5522 if (!err) {
5523 /* Reassembly complete */
5524 chan->sdu = NULL;
5525 chan->sdu_last_frag = NULL;
5526 chan->sdu_len = 0;
5527 }
5528 break;
5529 }
5530
5531 if (err) {
5532 kfree_skb(skb);
5533 kfree_skb(chan->sdu);
5534 chan->sdu = NULL;
5535 chan->sdu_last_frag = NULL;
5536 chan->sdu_len = 0;
5537 }
5538
5539 return err;
5540 }
5541
5542 static int l2cap_resegment(struct l2cap_chan *chan)
5543 {
5544 /* Placeholder */
5545 return 0;
5546 }
5547
5548 void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
5549 {
5550 u8 event;
5551
5552 if (chan->mode != L2CAP_MODE_ERTM)
5553 return;
5554
5555 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
5556 l2cap_tx(chan, NULL, NULL, event);
5557 }
5558
5559 static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5560 {
5561 int err = 0;
5562 /* Pass sequential frames to l2cap_reassemble_sdu()
5563 * until a gap is encountered.
5564 */
5565
5566 BT_DBG("chan %p", chan);
5567
5568 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5569 struct sk_buff *skb;
5570 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5571 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5572
5573 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5574
5575 if (!skb)
5576 break;
5577
5578 skb_unlink(skb, &chan->srej_q);
5579 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5580 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5581 if (err)
5582 break;
5583 }
5584
5585 if (skb_queue_empty(&chan->srej_q)) {
5586 chan->rx_state = L2CAP_RX_STATE_RECV;
5587 l2cap_send_ack(chan);
5588 }
5589
5590 return err;
5591 }
5592
5593 static void l2cap_handle_srej(struct l2cap_chan *chan,
5594 struct l2cap_ctrl *control)
5595 {
5596 struct sk_buff *skb;
5597
5598 BT_DBG("chan %p, control %p", chan, control);
5599
5600 if (control->reqseq == chan->next_tx_seq) {
5601 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5602 l2cap_send_disconn_req(chan, ECONNRESET);
5603 return;
5604 }
5605
5606 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5607
5608 if (skb == NULL) {
5609 BT_DBG("Seq %d not available for retransmission",
5610 control->reqseq);
5611 return;
5612 }
5613
5614 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5615 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5616 l2cap_send_disconn_req(chan, ECONNRESET);
5617 return;
5618 }
5619
5620 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5621
5622 if (control->poll) {
5623 l2cap_pass_to_tx(chan, control);
5624
5625 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5626 l2cap_retransmit(chan, control);
5627 l2cap_ertm_send(chan);
5628
5629 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5630 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5631 chan->srej_save_reqseq = control->reqseq;
5632 }
5633 } else {
5634 l2cap_pass_to_tx_fbit(chan, control);
5635
5636 if (control->final) {
5637 if (chan->srej_save_reqseq != control->reqseq ||
5638 !test_and_clear_bit(CONN_SREJ_ACT,
5639 &chan->conn_state))
5640 l2cap_retransmit(chan, control);
5641 } else {
5642 l2cap_retransmit(chan, control);
5643 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5644 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5645 chan->srej_save_reqseq = control->reqseq;
5646 }
5647 }
5648 }
5649 }
5650
5651 static void l2cap_handle_rej(struct l2cap_chan *chan,
5652 struct l2cap_ctrl *control)
5653 {
5654 struct sk_buff *skb;
5655
5656 BT_DBG("chan %p, control %p", chan, control);
5657
5658 if (control->reqseq == chan->next_tx_seq) {
5659 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5660 l2cap_send_disconn_req(chan, ECONNRESET);
5661 return;
5662 }
5663
5664 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5665
5666 if (chan->max_tx && skb &&
5667 bt_cb(skb)->control.retries >= chan->max_tx) {
5668 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5669 l2cap_send_disconn_req(chan, ECONNRESET);
5670 return;
5671 }
5672
5673 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5674
5675 l2cap_pass_to_tx(chan, control);
5676
5677 if (control->final) {
5678 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5679 l2cap_retransmit_all(chan, control);
5680 } else {
5681 l2cap_retransmit_all(chan, control);
5682 l2cap_ertm_send(chan);
5683 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5684 set_bit(CONN_REJ_ACT, &chan->conn_state);
5685 }
5686 }
5687
5688 static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5689 {
5690 BT_DBG("chan %p, txseq %d", chan, txseq);
5691
5692 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5693 chan->expected_tx_seq);
5694
5695 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5696 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5697 chan->tx_win) {
5698 /* See notes below regarding "double poll" and
5699 * invalid packets.
5700 */
5701 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5702 BT_DBG("Invalid/Ignore - after SREJ");
5703 return L2CAP_TXSEQ_INVALID_IGNORE;
5704 } else {
5705 BT_DBG("Invalid - in window after SREJ sent");
5706 return L2CAP_TXSEQ_INVALID;
5707 }
5708 }
5709
5710 if (chan->srej_list.head == txseq) {
5711 BT_DBG("Expected SREJ");
5712 return L2CAP_TXSEQ_EXPECTED_SREJ;
5713 }
5714
5715 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5716 BT_DBG("Duplicate SREJ - txseq already stored");
5717 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5718 }
5719
5720 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5721 BT_DBG("Unexpected SREJ - not requested");
5722 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5723 }
5724 }
5725
5726 if (chan->expected_tx_seq == txseq) {
5727 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5728 chan->tx_win) {
5729 BT_DBG("Invalid - txseq outside tx window");
5730 return L2CAP_TXSEQ_INVALID;
5731 } else {
5732 BT_DBG("Expected");
5733 return L2CAP_TXSEQ_EXPECTED;
5734 }
5735 }
5736
5737 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
5738 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
5739 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5740 return L2CAP_TXSEQ_DUPLICATE;
5741 }
5742
5743 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5744 /* A source of invalid packets is a "double poll" condition,
5745 * where delays cause us to send multiple poll packets. If
5746 * the remote stack receives and processes both polls,
5747 * sequence numbers can wrap around in such a way that a
5748 * resent frame has a sequence number that looks like new data
5749 * with a sequence gap. This would trigger an erroneous SREJ
5750 * request.
5751 *
5752 * Fortunately, this is impossible with a tx window that's
5753 * less than half of the maximum sequence number, which allows
5754 * invalid frames to be safely ignored.
5755 *
5756 * With tx window sizes greater than half of the tx window
5757 * maximum, the frame is invalid and cannot be ignored. This
5758 * causes a disconnect.
5759 */
5760
5761 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5762 BT_DBG("Invalid/Ignore - txseq outside tx window");
5763 return L2CAP_TXSEQ_INVALID_IGNORE;
5764 } else {
5765 BT_DBG("Invalid - txseq outside tx window");
5766 return L2CAP_TXSEQ_INVALID;
5767 }
5768 } else {
5769 BT_DBG("Unexpected - txseq indicates missing frames");
5770 return L2CAP_TXSEQ_UNEXPECTED;
5771 }
5772 }
5773
5774 static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5775 struct l2cap_ctrl *control,
5776 struct sk_buff *skb, u8 event)
5777 {
5778 int err = 0;
5779 bool skb_in_use = 0;
5780
5781 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5782 event);
5783
5784 switch (event) {
5785 case L2CAP_EV_RECV_IFRAME:
5786 switch (l2cap_classify_txseq(chan, control->txseq)) {
5787 case L2CAP_TXSEQ_EXPECTED:
5788 l2cap_pass_to_tx(chan, control);
5789
5790 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5791 BT_DBG("Busy, discarding expected seq %d",
5792 control->txseq);
5793 break;
5794 }
5795
5796 chan->expected_tx_seq = __next_seq(chan,
5797 control->txseq);
5798
5799 chan->buffer_seq = chan->expected_tx_seq;
5800 skb_in_use = 1;
5801
5802 err = l2cap_reassemble_sdu(chan, skb, control);
5803 if (err)
5804 break;
5805
5806 if (control->final) {
5807 if (!test_and_clear_bit(CONN_REJ_ACT,
5808 &chan->conn_state)) {
5809 control->final = 0;
5810 l2cap_retransmit_all(chan, control);
5811 l2cap_ertm_send(chan);
5812 }
5813 }
5814
5815 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5816 l2cap_send_ack(chan);
5817 break;
5818 case L2CAP_TXSEQ_UNEXPECTED:
5819 l2cap_pass_to_tx(chan, control);
5820
5821 /* Can't issue SREJ frames in the local busy state.
5822 * Drop this frame, it will be seen as missing
5823 * when local busy is exited.
5824 */
5825 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5826 BT_DBG("Busy, discarding unexpected seq %d",
5827 control->txseq);
5828 break;
5829 }
5830
5831 /* There was a gap in the sequence, so an SREJ
5832 * must be sent for each missing frame. The
5833 * current frame is stored for later use.
5834 */
5835 skb_queue_tail(&chan->srej_q, skb);
5836 skb_in_use = 1;
5837 BT_DBG("Queued %p (queue len %d)", skb,
5838 skb_queue_len(&chan->srej_q));
5839
5840 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5841 l2cap_seq_list_clear(&chan->srej_list);
5842 l2cap_send_srej(chan, control->txseq);
5843
5844 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5845 break;
5846 case L2CAP_TXSEQ_DUPLICATE:
5847 l2cap_pass_to_tx(chan, control);
5848 break;
5849 case L2CAP_TXSEQ_INVALID_IGNORE:
5850 break;
5851 case L2CAP_TXSEQ_INVALID:
5852 default:
5853 l2cap_send_disconn_req(chan, ECONNRESET);
5854 break;
5855 }
5856 break;
5857 case L2CAP_EV_RECV_RR:
5858 l2cap_pass_to_tx(chan, control);
5859 if (control->final) {
5860 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5861
5862 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5863 !__chan_is_moving(chan)) {
5864 control->final = 0;
5865 l2cap_retransmit_all(chan, control);
5866 }
5867
5868 l2cap_ertm_send(chan);
5869 } else if (control->poll) {
5870 l2cap_send_i_or_rr_or_rnr(chan);
5871 } else {
5872 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5873 &chan->conn_state) &&
5874 chan->unacked_frames)
5875 __set_retrans_timer(chan);
5876
5877 l2cap_ertm_send(chan);
5878 }
5879 break;
5880 case L2CAP_EV_RECV_RNR:
5881 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5882 l2cap_pass_to_tx(chan, control);
5883 if (control && control->poll) {
5884 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5885 l2cap_send_rr_or_rnr(chan, 0);
5886 }
5887 __clear_retrans_timer(chan);
5888 l2cap_seq_list_clear(&chan->retrans_list);
5889 break;
5890 case L2CAP_EV_RECV_REJ:
5891 l2cap_handle_rej(chan, control);
5892 break;
5893 case L2CAP_EV_RECV_SREJ:
5894 l2cap_handle_srej(chan, control);
5895 break;
5896 default:
5897 break;
5898 }
5899
5900 if (skb && !skb_in_use) {
5901 BT_DBG("Freeing %p", skb);
5902 kfree_skb(skb);
5903 }
5904
5905 return err;
5906 }
5907
5908 static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5909 struct l2cap_ctrl *control,
5910 struct sk_buff *skb, u8 event)
5911 {
5912 int err = 0;
5913 u16 txseq = control->txseq;
5914 bool skb_in_use = 0;
5915
5916 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5917 event);
5918
5919 switch (event) {
5920 case L2CAP_EV_RECV_IFRAME:
5921 switch (l2cap_classify_txseq(chan, txseq)) {
5922 case L2CAP_TXSEQ_EXPECTED:
5923 /* Keep frame for reassembly later */
5924 l2cap_pass_to_tx(chan, control);
5925 skb_queue_tail(&chan->srej_q, skb);
5926 skb_in_use = 1;
5927 BT_DBG("Queued %p (queue len %d)", skb,
5928 skb_queue_len(&chan->srej_q));
5929
5930 chan->expected_tx_seq = __next_seq(chan, txseq);
5931 break;
5932 case L2CAP_TXSEQ_EXPECTED_SREJ:
5933 l2cap_seq_list_pop(&chan->srej_list);
5934
5935 l2cap_pass_to_tx(chan, control);
5936 skb_queue_tail(&chan->srej_q, skb);
5937 skb_in_use = 1;
5938 BT_DBG("Queued %p (queue len %d)", skb,
5939 skb_queue_len(&chan->srej_q));
5940
5941 err = l2cap_rx_queued_iframes(chan);
5942 if (err)
5943 break;
5944
5945 break;
5946 case L2CAP_TXSEQ_UNEXPECTED:
5947 /* Got a frame that can't be reassembled yet.
5948 * Save it for later, and send SREJs to cover
5949 * the missing frames.
5950 */
5951 skb_queue_tail(&chan->srej_q, skb);
5952 skb_in_use = 1;
5953 BT_DBG("Queued %p (queue len %d)", skb,
5954 skb_queue_len(&chan->srej_q));
5955
5956 l2cap_pass_to_tx(chan, control);
5957 l2cap_send_srej(chan, control->txseq);
5958 break;
5959 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5960 /* This frame was requested with an SREJ, but
5961 * some expected retransmitted frames are
5962 * missing. Request retransmission of missing
5963 * SREJ'd frames.
5964 */
5965 skb_queue_tail(&chan->srej_q, skb);
5966 skb_in_use = 1;
5967 BT_DBG("Queued %p (queue len %d)", skb,
5968 skb_queue_len(&chan->srej_q));
5969
5970 l2cap_pass_to_tx(chan, control);
5971 l2cap_send_srej_list(chan, control->txseq);
5972 break;
5973 case L2CAP_TXSEQ_DUPLICATE_SREJ:
5974 /* We've already queued this frame. Drop this copy. */
5975 l2cap_pass_to_tx(chan, control);
5976 break;
5977 case L2CAP_TXSEQ_DUPLICATE:
5978 /* Expecting a later sequence number, so this frame
5979 * was already received. Ignore it completely.
5980 */
5981 break;
5982 case L2CAP_TXSEQ_INVALID_IGNORE:
5983 break;
5984 case L2CAP_TXSEQ_INVALID:
5985 default:
5986 l2cap_send_disconn_req(chan, ECONNRESET);
5987 break;
5988 }
5989 break;
5990 case L2CAP_EV_RECV_RR:
5991 l2cap_pass_to_tx(chan, control);
5992 if (control->final) {
5993 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5994
5995 if (!test_and_clear_bit(CONN_REJ_ACT,
5996 &chan->conn_state)) {
5997 control->final = 0;
5998 l2cap_retransmit_all(chan, control);
5999 }
6000
6001 l2cap_ertm_send(chan);
6002 } else if (control->poll) {
6003 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6004 &chan->conn_state) &&
6005 chan->unacked_frames) {
6006 __set_retrans_timer(chan);
6007 }
6008
6009 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6010 l2cap_send_srej_tail(chan);
6011 } else {
6012 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6013 &chan->conn_state) &&
6014 chan->unacked_frames)
6015 __set_retrans_timer(chan);
6016
6017 l2cap_send_ack(chan);
6018 }
6019 break;
6020 case L2CAP_EV_RECV_RNR:
6021 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6022 l2cap_pass_to_tx(chan, control);
6023 if (control->poll) {
6024 l2cap_send_srej_tail(chan);
6025 } else {
6026 struct l2cap_ctrl rr_control;
6027 memset(&rr_control, 0, sizeof(rr_control));
6028 rr_control.sframe = 1;
6029 rr_control.super = L2CAP_SUPER_RR;
6030 rr_control.reqseq = chan->buffer_seq;
6031 l2cap_send_sframe(chan, &rr_control);
6032 }
6033
6034 break;
6035 case L2CAP_EV_RECV_REJ:
6036 l2cap_handle_rej(chan, control);
6037 break;
6038 case L2CAP_EV_RECV_SREJ:
6039 l2cap_handle_srej(chan, control);
6040 break;
6041 }
6042
6043 if (skb && !skb_in_use) {
6044 BT_DBG("Freeing %p", skb);
6045 kfree_skb(skb);
6046 }
6047
6048 return err;
6049 }
6050
6051 static int l2cap_finish_move(struct l2cap_chan *chan)
6052 {
6053 BT_DBG("chan %p", chan);
6054
6055 chan->rx_state = L2CAP_RX_STATE_RECV;
6056
6057 if (chan->hs_hcon)
6058 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6059 else
6060 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6061
6062 return l2cap_resegment(chan);
6063 }
6064
6065 static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6066 struct l2cap_ctrl *control,
6067 struct sk_buff *skb, u8 event)
6068 {
6069 int err;
6070
6071 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6072 event);
6073
6074 if (!control->poll)
6075 return -EPROTO;
6076
6077 l2cap_process_reqseq(chan, control->reqseq);
6078
6079 if (!skb_queue_empty(&chan->tx_q))
6080 chan->tx_send_head = skb_peek(&chan->tx_q);
6081 else
6082 chan->tx_send_head = NULL;
6083
6084 /* Rewind next_tx_seq to the point expected
6085 * by the receiver.
6086 */
6087 chan->next_tx_seq = control->reqseq;
6088 chan->unacked_frames = 0;
6089
6090 err = l2cap_finish_move(chan);
6091 if (err)
6092 return err;
6093
6094 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6095 l2cap_send_i_or_rr_or_rnr(chan);
6096
6097 if (event == L2CAP_EV_RECV_IFRAME)
6098 return -EPROTO;
6099
6100 return l2cap_rx_state_recv(chan, control, NULL, event);
6101 }
6102
6103 static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6104 struct l2cap_ctrl *control,
6105 struct sk_buff *skb, u8 event)
6106 {
6107 int err;
6108
6109 if (!control->final)
6110 return -EPROTO;
6111
6112 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6113
6114 chan->rx_state = L2CAP_RX_STATE_RECV;
6115 l2cap_process_reqseq(chan, control->reqseq);
6116
6117 if (!skb_queue_empty(&chan->tx_q))
6118 chan->tx_send_head = skb_peek(&chan->tx_q);
6119 else
6120 chan->tx_send_head = NULL;
6121
6122 /* Rewind next_tx_seq to the point expected
6123 * by the receiver.
6124 */
6125 chan->next_tx_seq = control->reqseq;
6126 chan->unacked_frames = 0;
6127
6128 if (chan->hs_hcon)
6129 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6130 else
6131 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6132
6133 err = l2cap_resegment(chan);
6134
6135 if (!err)
6136 err = l2cap_rx_state_recv(chan, control, skb, event);
6137
6138 return err;
6139 }
6140
6141 static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6142 {
6143 /* Make sure reqseq is for a packet that has been sent but not acked */
6144 u16 unacked;
6145
6146 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6147 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6148 }
6149
6150 static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6151 struct sk_buff *skb, u8 event)
6152 {
6153 int err = 0;
6154
6155 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6156 control, skb, event, chan->rx_state);
6157
6158 if (__valid_reqseq(chan, control->reqseq)) {
6159 switch (chan->rx_state) {
6160 case L2CAP_RX_STATE_RECV:
6161 err = l2cap_rx_state_recv(chan, control, skb, event);
6162 break;
6163 case L2CAP_RX_STATE_SREJ_SENT:
6164 err = l2cap_rx_state_srej_sent(chan, control, skb,
6165 event);
6166 break;
6167 case L2CAP_RX_STATE_WAIT_P:
6168 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6169 break;
6170 case L2CAP_RX_STATE_WAIT_F:
6171 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6172 break;
6173 default:
6174 /* shut it down */
6175 break;
6176 }
6177 } else {
6178 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6179 control->reqseq, chan->next_tx_seq,
6180 chan->expected_ack_seq);
6181 l2cap_send_disconn_req(chan, ECONNRESET);
6182 }
6183
6184 return err;
6185 }
6186
6187 static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6188 struct sk_buff *skb)
6189 {
6190 int err = 0;
6191
6192 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6193 chan->rx_state);
6194
6195 if (l2cap_classify_txseq(chan, control->txseq) ==
6196 L2CAP_TXSEQ_EXPECTED) {
6197 l2cap_pass_to_tx(chan, control);
6198
6199 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6200 __next_seq(chan, chan->buffer_seq));
6201
6202 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6203
6204 l2cap_reassemble_sdu(chan, skb, control);
6205 } else {
6206 if (chan->sdu) {
6207 kfree_skb(chan->sdu);
6208 chan->sdu = NULL;
6209 }
6210 chan->sdu_last_frag = NULL;
6211 chan->sdu_len = 0;
6212
6213 if (skb) {
6214 BT_DBG("Freeing %p", skb);
6215 kfree_skb(skb);
6216 }
6217 }
6218
6219 chan->last_acked_seq = control->txseq;
6220 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6221
6222 return err;
6223 }
6224
6225 static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6226 {
6227 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6228 u16 len;
6229 u8 event;
6230
6231 __unpack_control(chan, skb);
6232
6233 len = skb->len;
6234
6235 /*
6236 * We can just drop the corrupted I-frame here.
6237 * Receiver will miss it and start proper recovery
6238 * procedures and ask for retransmission.
6239 */
6240 if (l2cap_check_fcs(chan, skb))
6241 goto drop;
6242
6243 if (!control->sframe && control->sar == L2CAP_SAR_START)
6244 len -= L2CAP_SDULEN_SIZE;
6245
6246 if (chan->fcs == L2CAP_FCS_CRC16)
6247 len -= L2CAP_FCS_SIZE;
6248
6249 if (len > chan->mps) {
6250 l2cap_send_disconn_req(chan, ECONNRESET);
6251 goto drop;
6252 }
6253
6254 if (!control->sframe) {
6255 int err;
6256
6257 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6258 control->sar, control->reqseq, control->final,
6259 control->txseq);
6260
6261 /* Validate F-bit - F=0 always valid, F=1 only
6262 * valid in TX WAIT_F
6263 */
6264 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
6265 goto drop;
6266
6267 if (chan->mode != L2CAP_MODE_STREAMING) {
6268 event = L2CAP_EV_RECV_IFRAME;
6269 err = l2cap_rx(chan, control, skb, event);
6270 } else {
6271 err = l2cap_stream_rx(chan, control, skb);
6272 }
6273
6274 if (err)
6275 l2cap_send_disconn_req(chan, ECONNRESET);
6276 } else {
6277 const u8 rx_func_to_event[4] = {
6278 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6279 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6280 };
6281
6282 /* Only I-frames are expected in streaming mode */
6283 if (chan->mode == L2CAP_MODE_STREAMING)
6284 goto drop;
6285
6286 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6287 control->reqseq, control->final, control->poll,
6288 control->super);
6289
6290 if (len != 0) {
6291 BT_ERR("Trailing bytes: %d in sframe", len);
6292 l2cap_send_disconn_req(chan, ECONNRESET);
6293 goto drop;
6294 }
6295
6296 /* Validate F and P bits */
6297 if (control->final && (control->poll ||
6298 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6299 goto drop;
6300
6301 event = rx_func_to_event[control->super];
6302 if (l2cap_rx(chan, control, skb, event))
6303 l2cap_send_disconn_req(chan, ECONNRESET);
6304 }
6305
6306 return 0;
6307
6308 drop:
6309 kfree_skb(skb);
6310 return 0;
6311 }
6312
6313 static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6314 struct sk_buff *skb)
6315 {
6316 struct l2cap_chan *chan;
6317
6318 chan = l2cap_get_chan_by_scid(conn, cid);
6319 if (!chan) {
6320 if (cid == L2CAP_CID_A2MP) {
6321 chan = a2mp_channel_create(conn, skb);
6322 if (!chan) {
6323 kfree_skb(skb);
6324 return;
6325 }
6326
6327 l2cap_chan_lock(chan);
6328 } else {
6329 BT_DBG("unknown cid 0x%4.4x", cid);
6330 /* Drop packet and return */
6331 kfree_skb(skb);
6332 return;
6333 }
6334 }
6335
6336 BT_DBG("chan %p, len %d", chan, skb->len);
6337
6338 if (chan->state != BT_CONNECTED)
6339 goto drop;
6340
6341 switch (chan->mode) {
6342 case L2CAP_MODE_BASIC:
6343 /* If socket recv buffers overflows we drop data here
6344 * which is *bad* because L2CAP has to be reliable.
6345 * But we don't have any other choice. L2CAP doesn't
6346 * provide flow control mechanism. */
6347
6348 if (chan->imtu < skb->len)
6349 goto drop;
6350
6351 if (!chan->ops->recv(chan, skb))
6352 goto done;
6353 break;
6354
6355 case L2CAP_MODE_ERTM:
6356 case L2CAP_MODE_STREAMING:
6357 l2cap_data_rcv(chan, skb);
6358 goto done;
6359
6360 default:
6361 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
6362 break;
6363 }
6364
6365 drop:
6366 kfree_skb(skb);
6367
6368 done:
6369 l2cap_chan_unlock(chan);
6370 }
6371
6372 static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6373 struct sk_buff *skb)
6374 {
6375 struct l2cap_chan *chan;
6376
6377 chan = l2cap_global_chan_by_psm(0, psm, conn->src, conn->dst);
6378 if (!chan)
6379 goto drop;
6380
6381 BT_DBG("chan %p, len %d", chan, skb->len);
6382
6383 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
6384 goto drop;
6385
6386 if (chan->imtu < skb->len)
6387 goto drop;
6388
6389 if (!chan->ops->recv(chan, skb))
6390 return;
6391
6392 drop:
6393 kfree_skb(skb);
6394 }
6395
6396 static void l2cap_att_channel(struct l2cap_conn *conn,
6397 struct sk_buff *skb)
6398 {
6399 struct l2cap_chan *chan;
6400
6401 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
6402 conn->src, conn->dst);
6403 if (!chan)
6404 goto drop;
6405
6406 BT_DBG("chan %p, len %d", chan, skb->len);
6407
6408 if (chan->imtu < skb->len)
6409 goto drop;
6410
6411 if (!chan->ops->recv(chan, skb))
6412 return;
6413
6414 drop:
6415 kfree_skb(skb);
6416 }
6417
6418 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6419 {
6420 struct l2cap_hdr *lh = (void *) skb->data;
6421 u16 cid, len;
6422 __le16 psm;
6423
6424 skb_pull(skb, L2CAP_HDR_SIZE);
6425 cid = __le16_to_cpu(lh->cid);
6426 len = __le16_to_cpu(lh->len);
6427
6428 if (len != skb->len) {
6429 kfree_skb(skb);
6430 return;
6431 }
6432
6433 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6434
6435 switch (cid) {
6436 case L2CAP_CID_LE_SIGNALING:
6437 l2cap_le_sig_channel(conn, skb);
6438 break;
6439 case L2CAP_CID_SIGNALING:
6440 l2cap_sig_channel(conn, skb);
6441 break;
6442
6443 case L2CAP_CID_CONN_LESS:
6444 psm = get_unaligned((__le16 *) skb->data);
6445 skb_pull(skb, L2CAP_PSMLEN_SIZE);
6446 l2cap_conless_channel(conn, psm, skb);
6447 break;
6448
6449 case L2CAP_CID_ATT:
6450 l2cap_att_channel(conn, skb);
6451 break;
6452
6453 case L2CAP_CID_SMP:
6454 if (smp_sig_channel(conn, skb))
6455 l2cap_conn_del(conn->hcon, EACCES);
6456 break;
6457
6458 default:
6459 l2cap_data_channel(conn, cid, skb);
6460 break;
6461 }
6462 }
6463
6464 /* ---- L2CAP interface with lower layer (HCI) ---- */
6465
6466 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
6467 {
6468 int exact = 0, lm1 = 0, lm2 = 0;
6469 struct l2cap_chan *c;
6470
6471 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
6472
6473 /* Find listening sockets and check their link_mode */
6474 read_lock(&chan_list_lock);
6475 list_for_each_entry(c, &chan_list, global_l) {
6476 struct sock *sk = c->sk;
6477
6478 if (c->state != BT_LISTEN)
6479 continue;
6480
6481 if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) {
6482 lm1 |= HCI_LM_ACCEPT;
6483 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
6484 lm1 |= HCI_LM_MASTER;
6485 exact++;
6486 } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) {
6487 lm2 |= HCI_LM_ACCEPT;
6488 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
6489 lm2 |= HCI_LM_MASTER;
6490 }
6491 }
6492 read_unlock(&chan_list_lock);
6493
6494 return exact ? lm1 : lm2;
6495 }
6496
6497 void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
6498 {
6499 struct l2cap_conn *conn;
6500
6501 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
6502
6503 if (!status) {
6504 conn = l2cap_conn_add(hcon);
6505 if (conn)
6506 l2cap_conn_ready(conn);
6507 } else {
6508 l2cap_conn_del(hcon, bt_to_errno(status));
6509 }
6510 }
6511
6512 int l2cap_disconn_ind(struct hci_conn *hcon)
6513 {
6514 struct l2cap_conn *conn = hcon->l2cap_data;
6515
6516 BT_DBG("hcon %p", hcon);
6517
6518 if (!conn)
6519 return HCI_ERROR_REMOTE_USER_TERM;
6520 return conn->disc_reason;
6521 }
6522
6523 void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
6524 {
6525 BT_DBG("hcon %p reason %d", hcon, reason);
6526
6527 l2cap_conn_del(hcon, bt_to_errno(reason));
6528 }
6529
6530 static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
6531 {
6532 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
6533 return;
6534
6535 if (encrypt == 0x00) {
6536 if (chan->sec_level == BT_SECURITY_MEDIUM) {
6537 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
6538 } else if (chan->sec_level == BT_SECURITY_HIGH)
6539 l2cap_chan_close(chan, ECONNREFUSED);
6540 } else {
6541 if (chan->sec_level == BT_SECURITY_MEDIUM)
6542 __clear_chan_timer(chan);
6543 }
6544 }
6545
6546 int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
6547 {
6548 struct l2cap_conn *conn = hcon->l2cap_data;
6549 struct l2cap_chan *chan;
6550
6551 if (!conn)
6552 return 0;
6553
6554 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
6555
6556 if (hcon->type == LE_LINK) {
6557 if (!status && encrypt)
6558 smp_distribute_keys(conn, 0);
6559 cancel_delayed_work(&conn->security_timer);
6560 }
6561
6562 mutex_lock(&conn->chan_lock);
6563
6564 list_for_each_entry(chan, &conn->chan_l, list) {
6565 l2cap_chan_lock(chan);
6566
6567 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6568 state_to_string(chan->state));
6569
6570 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6571 l2cap_chan_unlock(chan);
6572 continue;
6573 }
6574
6575 if (chan->scid == L2CAP_CID_ATT) {
6576 if (!status && encrypt) {
6577 chan->sec_level = hcon->sec_level;
6578 l2cap_chan_ready(chan);
6579 }
6580
6581 l2cap_chan_unlock(chan);
6582 continue;
6583 }
6584
6585 if (!__l2cap_no_conn_pending(chan)) {
6586 l2cap_chan_unlock(chan);
6587 continue;
6588 }
6589
6590 if (!status && (chan->state == BT_CONNECTED ||
6591 chan->state == BT_CONFIG)) {
6592 struct sock *sk = chan->sk;
6593
6594 clear_bit(BT_SK_SUSPEND, &bt_sk(sk)->flags);
6595 sk->sk_state_change(sk);
6596
6597 l2cap_check_encryption(chan, encrypt);
6598 l2cap_chan_unlock(chan);
6599 continue;
6600 }
6601
6602 if (chan->state == BT_CONNECT) {
6603 if (!status) {
6604 l2cap_start_connection(chan);
6605 } else {
6606 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
6607 }
6608 } else if (chan->state == BT_CONNECT2) {
6609 struct sock *sk = chan->sk;
6610 struct l2cap_conn_rsp rsp;
6611 __u16 res, stat;
6612
6613 lock_sock(sk);
6614
6615 if (!status) {
6616 if (test_bit(BT_SK_DEFER_SETUP,
6617 &bt_sk(sk)->flags)) {
6618 res = L2CAP_CR_PEND;
6619 stat = L2CAP_CS_AUTHOR_PEND;
6620 chan->ops->defer(chan);
6621 } else {
6622 __l2cap_state_change(chan, BT_CONFIG);
6623 res = L2CAP_CR_SUCCESS;
6624 stat = L2CAP_CS_NO_INFO;
6625 }
6626 } else {
6627 __l2cap_state_change(chan, BT_DISCONN);
6628 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
6629 res = L2CAP_CR_SEC_BLOCK;
6630 stat = L2CAP_CS_NO_INFO;
6631 }
6632
6633 release_sock(sk);
6634
6635 rsp.scid = cpu_to_le16(chan->dcid);
6636 rsp.dcid = cpu_to_le16(chan->scid);
6637 rsp.result = cpu_to_le16(res);
6638 rsp.status = cpu_to_le16(stat);
6639 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
6640 sizeof(rsp), &rsp);
6641
6642 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6643 res == L2CAP_CR_SUCCESS) {
6644 char buf[128];
6645 set_bit(CONF_REQ_SENT, &chan->conf_state);
6646 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6647 L2CAP_CONF_REQ,
6648 l2cap_build_conf_req(chan, buf),
6649 buf);
6650 chan->num_conf_req++;
6651 }
6652 }
6653
6654 l2cap_chan_unlock(chan);
6655 }
6656
6657 mutex_unlock(&conn->chan_lock);
6658
6659 return 0;
6660 }
6661
6662 int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
6663 {
6664 struct l2cap_conn *conn = hcon->l2cap_data;
6665 struct l2cap_hdr *hdr;
6666 int len;
6667
6668 /* For AMP controller do not create l2cap conn */
6669 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6670 goto drop;
6671
6672 if (!conn)
6673 conn = l2cap_conn_add(hcon);
6674
6675 if (!conn)
6676 goto drop;
6677
6678 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6679
6680 switch (flags) {
6681 case ACL_START:
6682 case ACL_START_NO_FLUSH:
6683 case ACL_COMPLETE:
6684 if (conn->rx_len) {
6685 BT_ERR("Unexpected start frame (len %d)", skb->len);
6686 kfree_skb(conn->rx_skb);
6687 conn->rx_skb = NULL;
6688 conn->rx_len = 0;
6689 l2cap_conn_unreliable(conn, ECOMM);
6690 }
6691
6692 /* Start fragment always begin with Basic L2CAP header */
6693 if (skb->len < L2CAP_HDR_SIZE) {
6694 BT_ERR("Frame is too short (len %d)", skb->len);
6695 l2cap_conn_unreliable(conn, ECOMM);
6696 goto drop;
6697 }
6698
6699 hdr = (struct l2cap_hdr *) skb->data;
6700 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6701
6702 if (len == skb->len) {
6703 /* Complete frame received */
6704 l2cap_recv_frame(conn, skb);
6705 return 0;
6706 }
6707
6708 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6709
6710 if (skb->len > len) {
6711 BT_ERR("Frame is too long (len %d, expected len %d)",
6712 skb->len, len);
6713 l2cap_conn_unreliable(conn, ECOMM);
6714 goto drop;
6715 }
6716
6717 /* Allocate skb for the complete frame (with header) */
6718 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
6719 if (!conn->rx_skb)
6720 goto drop;
6721
6722 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
6723 skb->len);
6724 conn->rx_len = len - skb->len;
6725 break;
6726
6727 case ACL_CONT:
6728 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6729
6730 if (!conn->rx_len) {
6731 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6732 l2cap_conn_unreliable(conn, ECOMM);
6733 goto drop;
6734 }
6735
6736 if (skb->len > conn->rx_len) {
6737 BT_ERR("Fragment is too long (len %d, expected %d)",
6738 skb->len, conn->rx_len);
6739 kfree_skb(conn->rx_skb);
6740 conn->rx_skb = NULL;
6741 conn->rx_len = 0;
6742 l2cap_conn_unreliable(conn, ECOMM);
6743 goto drop;
6744 }
6745
6746 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
6747 skb->len);
6748 conn->rx_len -= skb->len;
6749
6750 if (!conn->rx_len) {
6751 /* Complete frame received */
6752 l2cap_recv_frame(conn, conn->rx_skb);
6753 conn->rx_skb = NULL;
6754 }
6755 break;
6756 }
6757
6758 drop:
6759 kfree_skb(skb);
6760 return 0;
6761 }
6762
6763 static int l2cap_debugfs_show(struct seq_file *f, void *p)
6764 {
6765 struct l2cap_chan *c;
6766
6767 read_lock(&chan_list_lock);
6768
6769 list_for_each_entry(c, &chan_list, global_l) {
6770 struct sock *sk = c->sk;
6771
6772 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
6773 &bt_sk(sk)->src, &bt_sk(sk)->dst,
6774 c->state, __le16_to_cpu(c->psm),
6775 c->scid, c->dcid, c->imtu, c->omtu,
6776 c->sec_level, c->mode);
6777 }
6778
6779 read_unlock(&chan_list_lock);
6780
6781 return 0;
6782 }
6783
6784 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6785 {
6786 return single_open(file, l2cap_debugfs_show, inode->i_private);
6787 }
6788
6789 static const struct file_operations l2cap_debugfs_fops = {
6790 .open = l2cap_debugfs_open,
6791 .read = seq_read,
6792 .llseek = seq_lseek,
6793 .release = single_release,
6794 };
6795
6796 static struct dentry *l2cap_debugfs;
6797
6798 int __init l2cap_init(void)
6799 {
6800 int err;
6801
6802 err = l2cap_init_sockets();
6803 if (err < 0)
6804 return err;
6805
6806 if (bt_debugfs) {
6807 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6808 NULL, &l2cap_debugfs_fops);
6809 if (!l2cap_debugfs)
6810 BT_ERR("Failed to create L2CAP debug file");
6811 }
6812
6813 return 0;
6814 }
6815
6816 void l2cap_exit(void)
6817 {
6818 debugfs_remove(l2cap_debugfs);
6819 l2cap_cleanup_sockets();
6820 }
6821
6822 module_param(disable_ertm, bool, 0644);
6823 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
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