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fc15174c612c3d087c43ccf736eda23aa2c60054
[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
40 #include "smp.h"
41 #include "a2mp.h"
42 #include "amp.h"
43
44 #define LE_FLOWCTL_MAX_CREDITS 65535
45
46 bool disable_ertm;
47
48 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
49 static u8 l2cap_fixed_chan[8] = { L2CAP_FC_SIG_BREDR | L2CAP_FC_CONNLESS, };
50
51 static LIST_HEAD(chan_list);
52 static DEFINE_RWLOCK(chan_list_lock);
53
54 static u16 le_max_credits = L2CAP_LE_MAX_CREDITS;
55 static u16 le_default_mps = L2CAP_LE_DEFAULT_MPS;
56
57 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
58 u8 code, u8 ident, u16 dlen, void *data);
59 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
60 void *data);
61 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
62 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
63
64 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
65 struct sk_buff_head *skbs, u8 event);
66
67 static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
68 {
69 if (hcon->type == LE_LINK) {
70 if (type == ADDR_LE_DEV_PUBLIC)
71 return BDADDR_LE_PUBLIC;
72 else
73 return BDADDR_LE_RANDOM;
74 }
75
76 return BDADDR_BREDR;
77 }
78
79 /* ---- L2CAP channels ---- */
80
81 static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
82 u16 cid)
83 {
84 struct l2cap_chan *c;
85
86 list_for_each_entry(c, &conn->chan_l, list) {
87 if (c->dcid == cid)
88 return c;
89 }
90 return NULL;
91 }
92
93 static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
94 u16 cid)
95 {
96 struct l2cap_chan *c;
97
98 list_for_each_entry(c, &conn->chan_l, list) {
99 if (c->scid == cid)
100 return c;
101 }
102 return NULL;
103 }
104
105 /* Find channel with given SCID.
106 * Returns locked channel. */
107 static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
108 u16 cid)
109 {
110 struct l2cap_chan *c;
111
112 mutex_lock(&conn->chan_lock);
113 c = __l2cap_get_chan_by_scid(conn, cid);
114 if (c)
115 l2cap_chan_lock(c);
116 mutex_unlock(&conn->chan_lock);
117
118 return c;
119 }
120
121 /* Find channel with given DCID.
122 * Returns locked channel.
123 */
124 static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
125 u16 cid)
126 {
127 struct l2cap_chan *c;
128
129 mutex_lock(&conn->chan_lock);
130 c = __l2cap_get_chan_by_dcid(conn, cid);
131 if (c)
132 l2cap_chan_lock(c);
133 mutex_unlock(&conn->chan_lock);
134
135 return c;
136 }
137
138 static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
139 u8 ident)
140 {
141 struct l2cap_chan *c;
142
143 list_for_each_entry(c, &conn->chan_l, list) {
144 if (c->ident == ident)
145 return c;
146 }
147 return NULL;
148 }
149
150 static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
151 u8 ident)
152 {
153 struct l2cap_chan *c;
154
155 mutex_lock(&conn->chan_lock);
156 c = __l2cap_get_chan_by_ident(conn, ident);
157 if (c)
158 l2cap_chan_lock(c);
159 mutex_unlock(&conn->chan_lock);
160
161 return c;
162 }
163
164 static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
165 {
166 struct l2cap_chan *c;
167
168 list_for_each_entry(c, &chan_list, global_l) {
169 if (c->sport == psm && !bacmp(&c->src, src))
170 return c;
171 }
172 return NULL;
173 }
174
175 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
176 {
177 int err;
178
179 write_lock(&chan_list_lock);
180
181 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
182 err = -EADDRINUSE;
183 goto done;
184 }
185
186 if (psm) {
187 chan->psm = psm;
188 chan->sport = psm;
189 err = 0;
190 } else {
191 u16 p;
192
193 err = -EINVAL;
194 for (p = 0x1001; p < 0x1100; p += 2)
195 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
196 chan->psm = cpu_to_le16(p);
197 chan->sport = cpu_to_le16(p);
198 err = 0;
199 break;
200 }
201 }
202
203 done:
204 write_unlock(&chan_list_lock);
205 return err;
206 }
207 EXPORT_SYMBOL_GPL(l2cap_add_psm);
208
209 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
210 {
211 write_lock(&chan_list_lock);
212
213 /* Override the defaults (which are for conn-oriented) */
214 chan->omtu = L2CAP_DEFAULT_MTU;
215 chan->chan_type = L2CAP_CHAN_FIXED;
216
217 chan->scid = scid;
218
219 write_unlock(&chan_list_lock);
220
221 return 0;
222 }
223
224 static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
225 {
226 u16 cid, dyn_end;
227
228 if (conn->hcon->type == LE_LINK)
229 dyn_end = L2CAP_CID_LE_DYN_END;
230 else
231 dyn_end = L2CAP_CID_DYN_END;
232
233 for (cid = L2CAP_CID_DYN_START; cid < dyn_end; cid++) {
234 if (!__l2cap_get_chan_by_scid(conn, cid))
235 return cid;
236 }
237
238 return 0;
239 }
240
241 static void l2cap_state_change(struct l2cap_chan *chan, int state)
242 {
243 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
244 state_to_string(state));
245
246 chan->state = state;
247 chan->ops->state_change(chan, state, 0);
248 }
249
250 static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
251 int state, int err)
252 {
253 chan->state = state;
254 chan->ops->state_change(chan, chan->state, err);
255 }
256
257 static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
258 {
259 chan->ops->state_change(chan, chan->state, err);
260 }
261
262 static void __set_retrans_timer(struct l2cap_chan *chan)
263 {
264 if (!delayed_work_pending(&chan->monitor_timer) &&
265 chan->retrans_timeout) {
266 l2cap_set_timer(chan, &chan->retrans_timer,
267 msecs_to_jiffies(chan->retrans_timeout));
268 }
269 }
270
271 static void __set_monitor_timer(struct l2cap_chan *chan)
272 {
273 __clear_retrans_timer(chan);
274 if (chan->monitor_timeout) {
275 l2cap_set_timer(chan, &chan->monitor_timer,
276 msecs_to_jiffies(chan->monitor_timeout));
277 }
278 }
279
280 static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
281 u16 seq)
282 {
283 struct sk_buff *skb;
284
285 skb_queue_walk(head, skb) {
286 if (bt_cb(skb)->control.txseq == seq)
287 return skb;
288 }
289
290 return NULL;
291 }
292
293 /* ---- L2CAP sequence number lists ---- */
294
295 /* For ERTM, ordered lists of sequence numbers must be tracked for
296 * SREJ requests that are received and for frames that are to be
297 * retransmitted. These seq_list functions implement a singly-linked
298 * list in an array, where membership in the list can also be checked
299 * in constant time. Items can also be added to the tail of the list
300 * and removed from the head in constant time, without further memory
301 * allocs or frees.
302 */
303
304 static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
305 {
306 size_t alloc_size, i;
307
308 /* Allocated size is a power of 2 to map sequence numbers
309 * (which may be up to 14 bits) in to a smaller array that is
310 * sized for the negotiated ERTM transmit windows.
311 */
312 alloc_size = roundup_pow_of_two(size);
313
314 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
315 if (!seq_list->list)
316 return -ENOMEM;
317
318 seq_list->mask = alloc_size - 1;
319 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
320 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
321 for (i = 0; i < alloc_size; i++)
322 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
323
324 return 0;
325 }
326
327 static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
328 {
329 kfree(seq_list->list);
330 }
331
332 static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
333 u16 seq)
334 {
335 /* Constant-time check for list membership */
336 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
337 }
338
339 static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
340 {
341 u16 seq = seq_list->head;
342 u16 mask = seq_list->mask;
343
344 seq_list->head = seq_list->list[seq & mask];
345 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
346
347 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
348 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
349 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
350 }
351
352 return seq;
353 }
354
355 static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
356 {
357 u16 i;
358
359 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
360 return;
361
362 for (i = 0; i <= seq_list->mask; i++)
363 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
364
365 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
366 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
367 }
368
369 static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
370 {
371 u16 mask = seq_list->mask;
372
373 /* All appends happen in constant time */
374
375 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
376 return;
377
378 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
379 seq_list->head = seq;
380 else
381 seq_list->list[seq_list->tail & mask] = seq;
382
383 seq_list->tail = seq;
384 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
385 }
386
387 static void l2cap_chan_timeout(struct work_struct *work)
388 {
389 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
390 chan_timer.work);
391 struct l2cap_conn *conn = chan->conn;
392 int reason;
393
394 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
395
396 mutex_lock(&conn->chan_lock);
397 l2cap_chan_lock(chan);
398
399 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
400 reason = ECONNREFUSED;
401 else if (chan->state == BT_CONNECT &&
402 chan->sec_level != BT_SECURITY_SDP)
403 reason = ECONNREFUSED;
404 else
405 reason = ETIMEDOUT;
406
407 l2cap_chan_close(chan, reason);
408
409 l2cap_chan_unlock(chan);
410
411 chan->ops->close(chan);
412 mutex_unlock(&conn->chan_lock);
413
414 l2cap_chan_put(chan);
415 }
416
417 struct l2cap_chan *l2cap_chan_create(void)
418 {
419 struct l2cap_chan *chan;
420
421 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
422 if (!chan)
423 return NULL;
424
425 mutex_init(&chan->lock);
426
427 write_lock(&chan_list_lock);
428 list_add(&chan->global_l, &chan_list);
429 write_unlock(&chan_list_lock);
430
431 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
432
433 chan->state = BT_OPEN;
434
435 kref_init(&chan->kref);
436
437 /* This flag is cleared in l2cap_chan_ready() */
438 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
439
440 BT_DBG("chan %p", chan);
441
442 return chan;
443 }
444 EXPORT_SYMBOL_GPL(l2cap_chan_create);
445
446 static void l2cap_chan_destroy(struct kref *kref)
447 {
448 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
449
450 BT_DBG("chan %p", chan);
451
452 write_lock(&chan_list_lock);
453 list_del(&chan->global_l);
454 write_unlock(&chan_list_lock);
455
456 kfree(chan);
457 }
458
459 void l2cap_chan_hold(struct l2cap_chan *c)
460 {
461 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
462
463 kref_get(&c->kref);
464 }
465
466 void l2cap_chan_put(struct l2cap_chan *c)
467 {
468 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
469
470 kref_put(&c->kref, l2cap_chan_destroy);
471 }
472 EXPORT_SYMBOL_GPL(l2cap_chan_put);
473
474 void l2cap_chan_set_defaults(struct l2cap_chan *chan)
475 {
476 chan->fcs = L2CAP_FCS_CRC16;
477 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
478 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
479 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
480 chan->remote_max_tx = chan->max_tx;
481 chan->remote_tx_win = chan->tx_win;
482 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
483 chan->sec_level = BT_SECURITY_LOW;
484 chan->flush_to = L2CAP_DEFAULT_FLUSH_TO;
485 chan->retrans_timeout = L2CAP_DEFAULT_RETRANS_TO;
486 chan->monitor_timeout = L2CAP_DEFAULT_MONITOR_TO;
487 chan->conf_state = 0;
488
489 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
490 }
491 EXPORT_SYMBOL_GPL(l2cap_chan_set_defaults);
492
493 static void l2cap_le_flowctl_init(struct l2cap_chan *chan)
494 {
495 chan->sdu = NULL;
496 chan->sdu_last_frag = NULL;
497 chan->sdu_len = 0;
498 chan->tx_credits = 0;
499 chan->rx_credits = le_max_credits;
500 chan->mps = min_t(u16, chan->imtu, le_default_mps);
501
502 skb_queue_head_init(&chan->tx_q);
503 }
504
505 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
506 {
507 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
508 __le16_to_cpu(chan->psm), chan->dcid);
509
510 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
511
512 chan->conn = conn;
513
514 switch (chan->chan_type) {
515 case L2CAP_CHAN_CONN_ORIENTED:
516 /* Alloc CID for connection-oriented socket */
517 chan->scid = l2cap_alloc_cid(conn);
518 if (conn->hcon->type == ACL_LINK)
519 chan->omtu = L2CAP_DEFAULT_MTU;
520 break;
521
522 case L2CAP_CHAN_CONN_LESS:
523 /* Connectionless socket */
524 chan->scid = L2CAP_CID_CONN_LESS;
525 chan->dcid = L2CAP_CID_CONN_LESS;
526 chan->omtu = L2CAP_DEFAULT_MTU;
527 break;
528
529 case L2CAP_CHAN_FIXED:
530 /* Caller will set CID and CID specific MTU values */
531 break;
532
533 default:
534 /* Raw socket can send/recv signalling messages only */
535 chan->scid = L2CAP_CID_SIGNALING;
536 chan->dcid = L2CAP_CID_SIGNALING;
537 chan->omtu = L2CAP_DEFAULT_MTU;
538 }
539
540 chan->local_id = L2CAP_BESTEFFORT_ID;
541 chan->local_stype = L2CAP_SERV_BESTEFFORT;
542 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
543 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
544 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
545 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
546
547 l2cap_chan_hold(chan);
548
549 /* Only keep a reference for fixed channels if they requested it */
550 if (chan->chan_type != L2CAP_CHAN_FIXED ||
551 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
552 hci_conn_hold(conn->hcon);
553
554 list_add(&chan->list, &conn->chan_l);
555 }
556
557 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
558 {
559 mutex_lock(&conn->chan_lock);
560 __l2cap_chan_add(conn, chan);
561 mutex_unlock(&conn->chan_lock);
562 }
563
564 void l2cap_chan_del(struct l2cap_chan *chan, int err)
565 {
566 struct l2cap_conn *conn = chan->conn;
567
568 __clear_chan_timer(chan);
569
570 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
571
572 chan->ops->teardown(chan, err);
573
574 if (conn) {
575 struct amp_mgr *mgr = conn->hcon->amp_mgr;
576 /* Delete from channel list */
577 list_del(&chan->list);
578
579 l2cap_chan_put(chan);
580
581 chan->conn = NULL;
582
583 /* Reference was only held for non-fixed channels or
584 * fixed channels that explicitly requested it using the
585 * FLAG_HOLD_HCI_CONN flag.
586 */
587 if (chan->chan_type != L2CAP_CHAN_FIXED ||
588 test_bit(FLAG_HOLD_HCI_CONN, &chan->flags))
589 hci_conn_drop(conn->hcon);
590
591 if (mgr && mgr->bredr_chan == chan)
592 mgr->bredr_chan = NULL;
593 }
594
595 if (chan->hs_hchan) {
596 struct hci_chan *hs_hchan = chan->hs_hchan;
597
598 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
599 amp_disconnect_logical_link(hs_hchan);
600 }
601
602 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
603 return;
604
605 switch(chan->mode) {
606 case L2CAP_MODE_BASIC:
607 break;
608
609 case L2CAP_MODE_LE_FLOWCTL:
610 skb_queue_purge(&chan->tx_q);
611 break;
612
613 case L2CAP_MODE_ERTM:
614 __clear_retrans_timer(chan);
615 __clear_monitor_timer(chan);
616 __clear_ack_timer(chan);
617
618 skb_queue_purge(&chan->srej_q);
619
620 l2cap_seq_list_free(&chan->srej_list);
621 l2cap_seq_list_free(&chan->retrans_list);
622
623 /* fall through */
624
625 case L2CAP_MODE_STREAMING:
626 skb_queue_purge(&chan->tx_q);
627 break;
628 }
629
630 return;
631 }
632 EXPORT_SYMBOL_GPL(l2cap_chan_del);
633
634 static void l2cap_conn_update_id_addr(struct work_struct *work)
635 {
636 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
637 id_addr_update_work);
638 struct hci_conn *hcon = conn->hcon;
639 struct l2cap_chan *chan;
640
641 mutex_lock(&conn->chan_lock);
642
643 list_for_each_entry(chan, &conn->chan_l, list) {
644 l2cap_chan_lock(chan);
645 bacpy(&chan->dst, &hcon->dst);
646 chan->dst_type = bdaddr_type(hcon, hcon->dst_type);
647 l2cap_chan_unlock(chan);
648 }
649
650 mutex_unlock(&conn->chan_lock);
651 }
652
653 static void l2cap_chan_le_connect_reject(struct l2cap_chan *chan)
654 {
655 struct l2cap_conn *conn = chan->conn;
656 struct l2cap_le_conn_rsp rsp;
657 u16 result;
658
659 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
660 result = L2CAP_CR_AUTHORIZATION;
661 else
662 result = L2CAP_CR_BAD_PSM;
663
664 l2cap_state_change(chan, BT_DISCONN);
665
666 rsp.dcid = cpu_to_le16(chan->scid);
667 rsp.mtu = cpu_to_le16(chan->imtu);
668 rsp.mps = cpu_to_le16(chan->mps);
669 rsp.credits = cpu_to_le16(chan->rx_credits);
670 rsp.result = cpu_to_le16(result);
671
672 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
673 &rsp);
674 }
675
676 static void l2cap_chan_connect_reject(struct l2cap_chan *chan)
677 {
678 struct l2cap_conn *conn = chan->conn;
679 struct l2cap_conn_rsp rsp;
680 u16 result;
681
682 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
683 result = L2CAP_CR_SEC_BLOCK;
684 else
685 result = L2CAP_CR_BAD_PSM;
686
687 l2cap_state_change(chan, BT_DISCONN);
688
689 rsp.scid = cpu_to_le16(chan->dcid);
690 rsp.dcid = cpu_to_le16(chan->scid);
691 rsp.result = cpu_to_le16(result);
692 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
693
694 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp);
695 }
696
697 void l2cap_chan_close(struct l2cap_chan *chan, int reason)
698 {
699 struct l2cap_conn *conn = chan->conn;
700
701 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
702
703 switch (chan->state) {
704 case BT_LISTEN:
705 chan->ops->teardown(chan, 0);
706 break;
707
708 case BT_CONNECTED:
709 case BT_CONFIG:
710 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
711 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
712 l2cap_send_disconn_req(chan, reason);
713 } else
714 l2cap_chan_del(chan, reason);
715 break;
716
717 case BT_CONNECT2:
718 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED) {
719 if (conn->hcon->type == ACL_LINK)
720 l2cap_chan_connect_reject(chan);
721 else if (conn->hcon->type == LE_LINK)
722 l2cap_chan_le_connect_reject(chan);
723 }
724
725 l2cap_chan_del(chan, reason);
726 break;
727
728 case BT_CONNECT:
729 case BT_DISCONN:
730 l2cap_chan_del(chan, reason);
731 break;
732
733 default:
734 chan->ops->teardown(chan, 0);
735 break;
736 }
737 }
738 EXPORT_SYMBOL(l2cap_chan_close);
739
740 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
741 {
742 switch (chan->chan_type) {
743 case L2CAP_CHAN_RAW:
744 switch (chan->sec_level) {
745 case BT_SECURITY_HIGH:
746 case BT_SECURITY_FIPS:
747 return HCI_AT_DEDICATED_BONDING_MITM;
748 case BT_SECURITY_MEDIUM:
749 return HCI_AT_DEDICATED_BONDING;
750 default:
751 return HCI_AT_NO_BONDING;
752 }
753 break;
754 case L2CAP_CHAN_CONN_LESS:
755 if (chan->psm == cpu_to_le16(L2CAP_PSM_3DSP)) {
756 if (chan->sec_level == BT_SECURITY_LOW)
757 chan->sec_level = BT_SECURITY_SDP;
758 }
759 if (chan->sec_level == BT_SECURITY_HIGH ||
760 chan->sec_level == BT_SECURITY_FIPS)
761 return HCI_AT_NO_BONDING_MITM;
762 else
763 return HCI_AT_NO_BONDING;
764 break;
765 case L2CAP_CHAN_CONN_ORIENTED:
766 if (chan->psm == cpu_to_le16(L2CAP_PSM_SDP)) {
767 if (chan->sec_level == BT_SECURITY_LOW)
768 chan->sec_level = BT_SECURITY_SDP;
769
770 if (chan->sec_level == BT_SECURITY_HIGH ||
771 chan->sec_level == BT_SECURITY_FIPS)
772 return HCI_AT_NO_BONDING_MITM;
773 else
774 return HCI_AT_NO_BONDING;
775 }
776 /* fall through */
777 default:
778 switch (chan->sec_level) {
779 case BT_SECURITY_HIGH:
780 case BT_SECURITY_FIPS:
781 return HCI_AT_GENERAL_BONDING_MITM;
782 case BT_SECURITY_MEDIUM:
783 return HCI_AT_GENERAL_BONDING;
784 default:
785 return HCI_AT_NO_BONDING;
786 }
787 break;
788 }
789 }
790
791 /* Service level security */
792 int l2cap_chan_check_security(struct l2cap_chan *chan, bool initiator)
793 {
794 struct l2cap_conn *conn = chan->conn;
795 __u8 auth_type;
796
797 if (conn->hcon->type == LE_LINK)
798 return smp_conn_security(conn->hcon, chan->sec_level);
799
800 auth_type = l2cap_get_auth_type(chan);
801
802 return hci_conn_security(conn->hcon, chan->sec_level, auth_type,
803 initiator);
804 }
805
806 static u8 l2cap_get_ident(struct l2cap_conn *conn)
807 {
808 u8 id;
809
810 /* Get next available identificator.
811 * 1 - 128 are used by kernel.
812 * 129 - 199 are reserved.
813 * 200 - 254 are used by utilities like l2ping, etc.
814 */
815
816 mutex_lock(&conn->ident_lock);
817
818 if (++conn->tx_ident > 128)
819 conn->tx_ident = 1;
820
821 id = conn->tx_ident;
822
823 mutex_unlock(&conn->ident_lock);
824
825 return id;
826 }
827
828 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
829 void *data)
830 {
831 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
832 u8 flags;
833
834 BT_DBG("code 0x%2.2x", code);
835
836 if (!skb)
837 return;
838
839 if (lmp_no_flush_capable(conn->hcon->hdev))
840 flags = ACL_START_NO_FLUSH;
841 else
842 flags = ACL_START;
843
844 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
845 skb->priority = HCI_PRIO_MAX;
846
847 hci_send_acl(conn->hchan, skb, flags);
848 }
849
850 static bool __chan_is_moving(struct l2cap_chan *chan)
851 {
852 return chan->move_state != L2CAP_MOVE_STABLE &&
853 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
854 }
855
856 static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
857 {
858 struct hci_conn *hcon = chan->conn->hcon;
859 u16 flags;
860
861 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
862 skb->priority);
863
864 if (chan->hs_hcon && !__chan_is_moving(chan)) {
865 if (chan->hs_hchan)
866 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
867 else
868 kfree_skb(skb);
869
870 return;
871 }
872
873 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
874 lmp_no_flush_capable(hcon->hdev))
875 flags = ACL_START_NO_FLUSH;
876 else
877 flags = ACL_START;
878
879 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
880 hci_send_acl(chan->conn->hchan, skb, flags);
881 }
882
883 static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
884 {
885 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
886 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
887
888 if (enh & L2CAP_CTRL_FRAME_TYPE) {
889 /* S-Frame */
890 control->sframe = 1;
891 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
892 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
893
894 control->sar = 0;
895 control->txseq = 0;
896 } else {
897 /* I-Frame */
898 control->sframe = 0;
899 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
900 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
901
902 control->poll = 0;
903 control->super = 0;
904 }
905 }
906
907 static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
908 {
909 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
910 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
911
912 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
913 /* S-Frame */
914 control->sframe = 1;
915 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
916 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
917
918 control->sar = 0;
919 control->txseq = 0;
920 } else {
921 /* I-Frame */
922 control->sframe = 0;
923 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
924 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
925
926 control->poll = 0;
927 control->super = 0;
928 }
929 }
930
931 static inline void __unpack_control(struct l2cap_chan *chan,
932 struct sk_buff *skb)
933 {
934 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
935 __unpack_extended_control(get_unaligned_le32(skb->data),
936 &bt_cb(skb)->control);
937 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
938 } else {
939 __unpack_enhanced_control(get_unaligned_le16(skb->data),
940 &bt_cb(skb)->control);
941 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
942 }
943 }
944
945 static u32 __pack_extended_control(struct l2cap_ctrl *control)
946 {
947 u32 packed;
948
949 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
950 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
951
952 if (control->sframe) {
953 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
954 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
955 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
956 } else {
957 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
958 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
959 }
960
961 return packed;
962 }
963
964 static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
965 {
966 u16 packed;
967
968 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
969 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
970
971 if (control->sframe) {
972 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
973 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
974 packed |= L2CAP_CTRL_FRAME_TYPE;
975 } else {
976 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
977 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
978 }
979
980 return packed;
981 }
982
983 static inline void __pack_control(struct l2cap_chan *chan,
984 struct l2cap_ctrl *control,
985 struct sk_buff *skb)
986 {
987 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
988 put_unaligned_le32(__pack_extended_control(control),
989 skb->data + L2CAP_HDR_SIZE);
990 } else {
991 put_unaligned_le16(__pack_enhanced_control(control),
992 skb->data + L2CAP_HDR_SIZE);
993 }
994 }
995
996 static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
997 {
998 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
999 return L2CAP_EXT_HDR_SIZE;
1000 else
1001 return L2CAP_ENH_HDR_SIZE;
1002 }
1003
1004 static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
1005 u32 control)
1006 {
1007 struct sk_buff *skb;
1008 struct l2cap_hdr *lh;
1009 int hlen = __ertm_hdr_size(chan);
1010
1011 if (chan->fcs == L2CAP_FCS_CRC16)
1012 hlen += L2CAP_FCS_SIZE;
1013
1014 skb = bt_skb_alloc(hlen, GFP_KERNEL);
1015
1016 if (!skb)
1017 return ERR_PTR(-ENOMEM);
1018
1019 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
1020 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
1021 lh->cid = cpu_to_le16(chan->dcid);
1022
1023 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1024 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
1025 else
1026 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
1027
1028 if (chan->fcs == L2CAP_FCS_CRC16) {
1029 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
1030 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1031 }
1032
1033 skb->priority = HCI_PRIO_MAX;
1034 return skb;
1035 }
1036
1037 static void l2cap_send_sframe(struct l2cap_chan *chan,
1038 struct l2cap_ctrl *control)
1039 {
1040 struct sk_buff *skb;
1041 u32 control_field;
1042
1043 BT_DBG("chan %p, control %p", chan, control);
1044
1045 if (!control->sframe)
1046 return;
1047
1048 if (__chan_is_moving(chan))
1049 return;
1050
1051 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
1052 !control->poll)
1053 control->final = 1;
1054
1055 if (control->super == L2CAP_SUPER_RR)
1056 clear_bit(CONN_RNR_SENT, &chan->conn_state);
1057 else if (control->super == L2CAP_SUPER_RNR)
1058 set_bit(CONN_RNR_SENT, &chan->conn_state);
1059
1060 if (control->super != L2CAP_SUPER_SREJ) {
1061 chan->last_acked_seq = control->reqseq;
1062 __clear_ack_timer(chan);
1063 }
1064
1065 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
1066 control->final, control->poll, control->super);
1067
1068 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
1069 control_field = __pack_extended_control(control);
1070 else
1071 control_field = __pack_enhanced_control(control);
1072
1073 skb = l2cap_create_sframe_pdu(chan, control_field);
1074 if (!IS_ERR(skb))
1075 l2cap_do_send(chan, skb);
1076 }
1077
1078 static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
1079 {
1080 struct l2cap_ctrl control;
1081
1082 BT_DBG("chan %p, poll %d", chan, poll);
1083
1084 memset(&control, 0, sizeof(control));
1085 control.sframe = 1;
1086 control.poll = poll;
1087
1088 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1089 control.super = L2CAP_SUPER_RNR;
1090 else
1091 control.super = L2CAP_SUPER_RR;
1092
1093 control.reqseq = chan->buffer_seq;
1094 l2cap_send_sframe(chan, &control);
1095 }
1096
1097 static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
1098 {
1099 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
1100 return true;
1101
1102 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
1103 }
1104
1105 static bool __amp_capable(struct l2cap_chan *chan)
1106 {
1107 struct l2cap_conn *conn = chan->conn;
1108 struct hci_dev *hdev;
1109 bool amp_available = false;
1110
1111 if (!conn->hs_enabled)
1112 return false;
1113
1114 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1115 return false;
1116
1117 read_lock(&hci_dev_list_lock);
1118 list_for_each_entry(hdev, &hci_dev_list, list) {
1119 if (hdev->amp_type != AMP_TYPE_BREDR &&
1120 test_bit(HCI_UP, &hdev->flags)) {
1121 amp_available = true;
1122 break;
1123 }
1124 }
1125 read_unlock(&hci_dev_list_lock);
1126
1127 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1128 return amp_available;
1129
1130 return false;
1131 }
1132
1133 static bool l2cap_check_efs(struct l2cap_chan *chan)
1134 {
1135 /* Check EFS parameters */
1136 return true;
1137 }
1138
1139 void l2cap_send_conn_req(struct l2cap_chan *chan)
1140 {
1141 struct l2cap_conn *conn = chan->conn;
1142 struct l2cap_conn_req req;
1143
1144 req.scid = cpu_to_le16(chan->scid);
1145 req.psm = chan->psm;
1146
1147 chan->ident = l2cap_get_ident(conn);
1148
1149 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1150
1151 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1152 }
1153
1154 static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1155 {
1156 struct l2cap_create_chan_req req;
1157 req.scid = cpu_to_le16(chan->scid);
1158 req.psm = chan->psm;
1159 req.amp_id = amp_id;
1160
1161 chan->ident = l2cap_get_ident(chan->conn);
1162
1163 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1164 sizeof(req), &req);
1165 }
1166
1167 static void l2cap_move_setup(struct l2cap_chan *chan)
1168 {
1169 struct sk_buff *skb;
1170
1171 BT_DBG("chan %p", chan);
1172
1173 if (chan->mode != L2CAP_MODE_ERTM)
1174 return;
1175
1176 __clear_retrans_timer(chan);
1177 __clear_monitor_timer(chan);
1178 __clear_ack_timer(chan);
1179
1180 chan->retry_count = 0;
1181 skb_queue_walk(&chan->tx_q, skb) {
1182 if (bt_cb(skb)->control.retries)
1183 bt_cb(skb)->control.retries = 1;
1184 else
1185 break;
1186 }
1187
1188 chan->expected_tx_seq = chan->buffer_seq;
1189
1190 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1191 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1192 l2cap_seq_list_clear(&chan->retrans_list);
1193 l2cap_seq_list_clear(&chan->srej_list);
1194 skb_queue_purge(&chan->srej_q);
1195
1196 chan->tx_state = L2CAP_TX_STATE_XMIT;
1197 chan->rx_state = L2CAP_RX_STATE_MOVE;
1198
1199 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1200 }
1201
1202 static void l2cap_move_done(struct l2cap_chan *chan)
1203 {
1204 u8 move_role = chan->move_role;
1205 BT_DBG("chan %p", chan);
1206
1207 chan->move_state = L2CAP_MOVE_STABLE;
1208 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1209
1210 if (chan->mode != L2CAP_MODE_ERTM)
1211 return;
1212
1213 switch (move_role) {
1214 case L2CAP_MOVE_ROLE_INITIATOR:
1215 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1216 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1217 break;
1218 case L2CAP_MOVE_ROLE_RESPONDER:
1219 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1220 break;
1221 }
1222 }
1223
1224 static void l2cap_chan_ready(struct l2cap_chan *chan)
1225 {
1226 /* This clears all conf flags, including CONF_NOT_COMPLETE */
1227 chan->conf_state = 0;
1228 __clear_chan_timer(chan);
1229
1230 if (chan->mode == L2CAP_MODE_LE_FLOWCTL && !chan->tx_credits)
1231 chan->ops->suspend(chan);
1232
1233 chan->state = BT_CONNECTED;
1234
1235 chan->ops->ready(chan);
1236 }
1237
1238 static void l2cap_le_connect(struct l2cap_chan *chan)
1239 {
1240 struct l2cap_conn *conn = chan->conn;
1241 struct l2cap_le_conn_req req;
1242
1243 if (test_and_set_bit(FLAG_LE_CONN_REQ_SENT, &chan->flags))
1244 return;
1245
1246 req.psm = chan->psm;
1247 req.scid = cpu_to_le16(chan->scid);
1248 req.mtu = cpu_to_le16(chan->imtu);
1249 req.mps = cpu_to_le16(chan->mps);
1250 req.credits = cpu_to_le16(chan->rx_credits);
1251
1252 chan->ident = l2cap_get_ident(conn);
1253
1254 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_REQ,
1255 sizeof(req), &req);
1256 }
1257
1258 static void l2cap_le_start(struct l2cap_chan *chan)
1259 {
1260 struct l2cap_conn *conn = chan->conn;
1261
1262 if (!smp_conn_security(conn->hcon, chan->sec_level))
1263 return;
1264
1265 if (!chan->psm) {
1266 l2cap_chan_ready(chan);
1267 return;
1268 }
1269
1270 if (chan->state == BT_CONNECT)
1271 l2cap_le_connect(chan);
1272 }
1273
1274 static void l2cap_start_connection(struct l2cap_chan *chan)
1275 {
1276 if (__amp_capable(chan)) {
1277 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1278 a2mp_discover_amp(chan);
1279 } else if (chan->conn->hcon->type == LE_LINK) {
1280 l2cap_le_start(chan);
1281 } else {
1282 l2cap_send_conn_req(chan);
1283 }
1284 }
1285
1286 static void l2cap_request_info(struct l2cap_conn *conn)
1287 {
1288 struct l2cap_info_req req;
1289
1290 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1291 return;
1292
1293 req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
1294
1295 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1296 conn->info_ident = l2cap_get_ident(conn);
1297
1298 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1299
1300 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1301 sizeof(req), &req);
1302 }
1303
1304 static void l2cap_do_start(struct l2cap_chan *chan)
1305 {
1306 struct l2cap_conn *conn = chan->conn;
1307
1308 if (conn->hcon->type == LE_LINK) {
1309 l2cap_le_start(chan);
1310 return;
1311 }
1312
1313 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)) {
1314 l2cap_request_info(conn);
1315 return;
1316 }
1317
1318 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1319 return;
1320
1321 if (l2cap_chan_check_security(chan, true) &&
1322 __l2cap_no_conn_pending(chan))
1323 l2cap_start_connection(chan);
1324 }
1325
1326 static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1327 {
1328 u32 local_feat_mask = l2cap_feat_mask;
1329 if (!disable_ertm)
1330 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1331
1332 switch (mode) {
1333 case L2CAP_MODE_ERTM:
1334 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1335 case L2CAP_MODE_STREAMING:
1336 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1337 default:
1338 return 0x00;
1339 }
1340 }
1341
1342 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
1343 {
1344 struct l2cap_conn *conn = chan->conn;
1345 struct l2cap_disconn_req req;
1346
1347 if (!conn)
1348 return;
1349
1350 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1351 __clear_retrans_timer(chan);
1352 __clear_monitor_timer(chan);
1353 __clear_ack_timer(chan);
1354 }
1355
1356 if (chan->scid == L2CAP_CID_A2MP) {
1357 l2cap_state_change(chan, BT_DISCONN);
1358 return;
1359 }
1360
1361 req.dcid = cpu_to_le16(chan->dcid);
1362 req.scid = cpu_to_le16(chan->scid);
1363 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1364 sizeof(req), &req);
1365
1366 l2cap_state_change_and_error(chan, BT_DISCONN, err);
1367 }
1368
1369 /* ---- L2CAP connections ---- */
1370 static void l2cap_conn_start(struct l2cap_conn *conn)
1371 {
1372 struct l2cap_chan *chan, *tmp;
1373
1374 BT_DBG("conn %p", conn);
1375
1376 mutex_lock(&conn->chan_lock);
1377
1378 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
1379 l2cap_chan_lock(chan);
1380
1381 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1382 l2cap_chan_ready(chan);
1383 l2cap_chan_unlock(chan);
1384 continue;
1385 }
1386
1387 if (chan->state == BT_CONNECT) {
1388 if (!l2cap_chan_check_security(chan, true) ||
1389 !__l2cap_no_conn_pending(chan)) {
1390 l2cap_chan_unlock(chan);
1391 continue;
1392 }
1393
1394 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1395 && test_bit(CONF_STATE2_DEVICE,
1396 &chan->conf_state)) {
1397 l2cap_chan_close(chan, ECONNRESET);
1398 l2cap_chan_unlock(chan);
1399 continue;
1400 }
1401
1402 l2cap_start_connection(chan);
1403
1404 } else if (chan->state == BT_CONNECT2) {
1405 struct l2cap_conn_rsp rsp;
1406 char buf[128];
1407 rsp.scid = cpu_to_le16(chan->dcid);
1408 rsp.dcid = cpu_to_le16(chan->scid);
1409
1410 if (l2cap_chan_check_security(chan, false)) {
1411 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
1412 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1413 rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
1414 chan->ops->defer(chan);
1415
1416 } else {
1417 l2cap_state_change(chan, BT_CONFIG);
1418 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
1419 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
1420 }
1421 } else {
1422 rsp.result = cpu_to_le16(L2CAP_CR_PEND);
1423 rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
1424 }
1425
1426 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1427 sizeof(rsp), &rsp);
1428
1429 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
1430 rsp.result != L2CAP_CR_SUCCESS) {
1431 l2cap_chan_unlock(chan);
1432 continue;
1433 }
1434
1435 set_bit(CONF_REQ_SENT, &chan->conf_state);
1436 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1437 l2cap_build_conf_req(chan, buf), buf);
1438 chan->num_conf_req++;
1439 }
1440
1441 l2cap_chan_unlock(chan);
1442 }
1443
1444 mutex_unlock(&conn->chan_lock);
1445 }
1446
1447 static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1448 {
1449 struct hci_conn *hcon = conn->hcon;
1450 struct hci_dev *hdev = hcon->hdev;
1451
1452 BT_DBG("%s conn %p", hdev->name, conn);
1453
1454 /* For outgoing pairing which doesn't necessarily have an
1455 * associated socket (e.g. mgmt_pair_device).
1456 */
1457 if (hcon->out)
1458 smp_conn_security(hcon, hcon->pending_sec_level);
1459
1460 /* For LE slave connections, make sure the connection interval
1461 * is in the range of the minium and maximum interval that has
1462 * been configured for this connection. If not, then trigger
1463 * the connection update procedure.
1464 */
1465 if (hcon->role == HCI_ROLE_SLAVE &&
1466 (hcon->le_conn_interval < hcon->le_conn_min_interval ||
1467 hcon->le_conn_interval > hcon->le_conn_max_interval)) {
1468 struct l2cap_conn_param_update_req req;
1469
1470 req.min = cpu_to_le16(hcon->le_conn_min_interval);
1471 req.max = cpu_to_le16(hcon->le_conn_max_interval);
1472 req.latency = cpu_to_le16(hcon->le_conn_latency);
1473 req.to_multiplier = cpu_to_le16(hcon->le_supv_timeout);
1474
1475 l2cap_send_cmd(conn, l2cap_get_ident(conn),
1476 L2CAP_CONN_PARAM_UPDATE_REQ, sizeof(req), &req);
1477 }
1478 }
1479
1480 static void l2cap_conn_ready(struct l2cap_conn *conn)
1481 {
1482 struct l2cap_chan *chan;
1483 struct hci_conn *hcon = conn->hcon;
1484
1485 BT_DBG("conn %p", conn);
1486
1487 if (hcon->type == ACL_LINK)
1488 l2cap_request_info(conn);
1489
1490 mutex_lock(&conn->chan_lock);
1491
1492 list_for_each_entry(chan, &conn->chan_l, list) {
1493
1494 l2cap_chan_lock(chan);
1495
1496 if (chan->scid == L2CAP_CID_A2MP) {
1497 l2cap_chan_unlock(chan);
1498 continue;
1499 }
1500
1501 if (hcon->type == LE_LINK) {
1502 l2cap_le_start(chan);
1503 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1504 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
1505 l2cap_chan_ready(chan);
1506 } else if (chan->state == BT_CONNECT) {
1507 l2cap_do_start(chan);
1508 }
1509
1510 l2cap_chan_unlock(chan);
1511 }
1512
1513 mutex_unlock(&conn->chan_lock);
1514
1515 if (hcon->type == LE_LINK)
1516 l2cap_le_conn_ready(conn);
1517
1518 queue_work(hcon->hdev->workqueue, &conn->pending_rx_work);
1519 }
1520
1521 /* Notify sockets that we cannot guaranty reliability anymore */
1522 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1523 {
1524 struct l2cap_chan *chan;
1525
1526 BT_DBG("conn %p", conn);
1527
1528 mutex_lock(&conn->chan_lock);
1529
1530 list_for_each_entry(chan, &conn->chan_l, list) {
1531 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1532 l2cap_chan_set_err(chan, err);
1533 }
1534
1535 mutex_unlock(&conn->chan_lock);
1536 }
1537
1538 static void l2cap_info_timeout(struct work_struct *work)
1539 {
1540 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1541 info_timer.work);
1542
1543 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
1544 conn->info_ident = 0;
1545
1546 l2cap_conn_start(conn);
1547 }
1548
1549 /*
1550 * l2cap_user
1551 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1552 * callback is called during registration. The ->remove callback is called
1553 * during unregistration.
1554 * An l2cap_user object can either be explicitly unregistered or when the
1555 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1556 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1557 * External modules must own a reference to the l2cap_conn object if they intend
1558 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1559 * any time if they don't.
1560 */
1561
1562 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1563 {
1564 struct hci_dev *hdev = conn->hcon->hdev;
1565 int ret;
1566
1567 /* We need to check whether l2cap_conn is registered. If it is not, we
1568 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1569 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1570 * relies on the parent hci_conn object to be locked. This itself relies
1571 * on the hci_dev object to be locked. So we must lock the hci device
1572 * here, too. */
1573
1574 hci_dev_lock(hdev);
1575
1576 if (user->list.next || user->list.prev) {
1577 ret = -EINVAL;
1578 goto out_unlock;
1579 }
1580
1581 /* conn->hchan is NULL after l2cap_conn_del() was called */
1582 if (!conn->hchan) {
1583 ret = -ENODEV;
1584 goto out_unlock;
1585 }
1586
1587 ret = user->probe(conn, user);
1588 if (ret)
1589 goto out_unlock;
1590
1591 list_add(&user->list, &conn->users);
1592 ret = 0;
1593
1594 out_unlock:
1595 hci_dev_unlock(hdev);
1596 return ret;
1597 }
1598 EXPORT_SYMBOL(l2cap_register_user);
1599
1600 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1601 {
1602 struct hci_dev *hdev = conn->hcon->hdev;
1603
1604 hci_dev_lock(hdev);
1605
1606 if (!user->list.next || !user->list.prev)
1607 goto out_unlock;
1608
1609 list_del(&user->list);
1610 user->list.next = NULL;
1611 user->list.prev = NULL;
1612 user->remove(conn, user);
1613
1614 out_unlock:
1615 hci_dev_unlock(hdev);
1616 }
1617 EXPORT_SYMBOL(l2cap_unregister_user);
1618
1619 static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1620 {
1621 struct l2cap_user *user;
1622
1623 while (!list_empty(&conn->users)) {
1624 user = list_first_entry(&conn->users, struct l2cap_user, list);
1625 list_del(&user->list);
1626 user->list.next = NULL;
1627 user->list.prev = NULL;
1628 user->remove(conn, user);
1629 }
1630 }
1631
1632 static void l2cap_conn_del(struct hci_conn *hcon, int err)
1633 {
1634 struct l2cap_conn *conn = hcon->l2cap_data;
1635 struct l2cap_chan *chan, *l;
1636
1637 if (!conn)
1638 return;
1639
1640 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1641
1642 kfree_skb(conn->rx_skb);
1643
1644 skb_queue_purge(&conn->pending_rx);
1645
1646 /* We can not call flush_work(&conn->pending_rx_work) here since we
1647 * might block if we are running on a worker from the same workqueue
1648 * pending_rx_work is waiting on.
1649 */
1650 if (work_pending(&conn->pending_rx_work))
1651 cancel_work_sync(&conn->pending_rx_work);
1652
1653 if (work_pending(&conn->id_addr_update_work))
1654 cancel_work_sync(&conn->id_addr_update_work);
1655
1656 l2cap_unregister_all_users(conn);
1657
1658 /* Force the connection to be immediately dropped */
1659 hcon->disc_timeout = 0;
1660
1661 mutex_lock(&conn->chan_lock);
1662
1663 /* Kill channels */
1664 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
1665 l2cap_chan_hold(chan);
1666 l2cap_chan_lock(chan);
1667
1668 l2cap_chan_del(chan, err);
1669
1670 l2cap_chan_unlock(chan);
1671
1672 chan->ops->close(chan);
1673 l2cap_chan_put(chan);
1674 }
1675
1676 mutex_unlock(&conn->chan_lock);
1677
1678 hci_chan_del(conn->hchan);
1679
1680 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1681 cancel_delayed_work_sync(&conn->info_timer);
1682
1683 hcon->l2cap_data = NULL;
1684 conn->hchan = NULL;
1685 l2cap_conn_put(conn);
1686 }
1687
1688 static void l2cap_conn_free(struct kref *ref)
1689 {
1690 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1691
1692 hci_conn_put(conn->hcon);
1693 kfree(conn);
1694 }
1695
1696 struct l2cap_conn *l2cap_conn_get(struct l2cap_conn *conn)
1697 {
1698 kref_get(&conn->ref);
1699 return conn;
1700 }
1701 EXPORT_SYMBOL(l2cap_conn_get);
1702
1703 void l2cap_conn_put(struct l2cap_conn *conn)
1704 {
1705 kref_put(&conn->ref, l2cap_conn_free);
1706 }
1707 EXPORT_SYMBOL(l2cap_conn_put);
1708
1709 /* ---- Socket interface ---- */
1710
1711 /* Find socket with psm and source / destination bdaddr.
1712 * Returns closest match.
1713 */
1714 static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1715 bdaddr_t *src,
1716 bdaddr_t *dst,
1717 u8 link_type)
1718 {
1719 struct l2cap_chan *c, *c1 = NULL;
1720
1721 read_lock(&chan_list_lock);
1722
1723 list_for_each_entry(c, &chan_list, global_l) {
1724 if (state && c->state != state)
1725 continue;
1726
1727 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
1728 continue;
1729
1730 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
1731 continue;
1732
1733 if (c->psm == psm) {
1734 int src_match, dst_match;
1735 int src_any, dst_any;
1736
1737 /* Exact match. */
1738 src_match = !bacmp(&c->src, src);
1739 dst_match = !bacmp(&c->dst, dst);
1740 if (src_match && dst_match) {
1741 l2cap_chan_hold(c);
1742 read_unlock(&chan_list_lock);
1743 return c;
1744 }
1745
1746 /* Closest match */
1747 src_any = !bacmp(&c->src, BDADDR_ANY);
1748 dst_any = !bacmp(&c->dst, BDADDR_ANY);
1749 if ((src_match && dst_any) || (src_any && dst_match) ||
1750 (src_any && dst_any))
1751 c1 = c;
1752 }
1753 }
1754
1755 if (c1)
1756 l2cap_chan_hold(c1);
1757
1758 read_unlock(&chan_list_lock);
1759
1760 return c1;
1761 }
1762
1763 static void l2cap_monitor_timeout(struct work_struct *work)
1764 {
1765 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1766 monitor_timer.work);
1767
1768 BT_DBG("chan %p", chan);
1769
1770 l2cap_chan_lock(chan);
1771
1772 if (!chan->conn) {
1773 l2cap_chan_unlock(chan);
1774 l2cap_chan_put(chan);
1775 return;
1776 }
1777
1778 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
1779
1780 l2cap_chan_unlock(chan);
1781 l2cap_chan_put(chan);
1782 }
1783
1784 static void l2cap_retrans_timeout(struct work_struct *work)
1785 {
1786 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1787 retrans_timer.work);
1788
1789 BT_DBG("chan %p", chan);
1790
1791 l2cap_chan_lock(chan);
1792
1793 if (!chan->conn) {
1794 l2cap_chan_unlock(chan);
1795 l2cap_chan_put(chan);
1796 return;
1797 }
1798
1799 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
1800 l2cap_chan_unlock(chan);
1801 l2cap_chan_put(chan);
1802 }
1803
1804 static void l2cap_streaming_send(struct l2cap_chan *chan,
1805 struct sk_buff_head *skbs)
1806 {
1807 struct sk_buff *skb;
1808 struct l2cap_ctrl *control;
1809
1810 BT_DBG("chan %p, skbs %p", chan, skbs);
1811
1812 if (__chan_is_moving(chan))
1813 return;
1814
1815 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1816
1817 while (!skb_queue_empty(&chan->tx_q)) {
1818
1819 skb = skb_dequeue(&chan->tx_q);
1820
1821 bt_cb(skb)->control.retries = 1;
1822 control = &bt_cb(skb)->control;
1823
1824 control->reqseq = 0;
1825 control->txseq = chan->next_tx_seq;
1826
1827 __pack_control(chan, control, skb);
1828
1829 if (chan->fcs == L2CAP_FCS_CRC16) {
1830 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1831 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1832 }
1833
1834 l2cap_do_send(chan, skb);
1835
1836 BT_DBG("Sent txseq %u", control->txseq);
1837
1838 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1839 chan->frames_sent++;
1840 }
1841 }
1842
1843 static int l2cap_ertm_send(struct l2cap_chan *chan)
1844 {
1845 struct sk_buff *skb, *tx_skb;
1846 struct l2cap_ctrl *control;
1847 int sent = 0;
1848
1849 BT_DBG("chan %p", chan);
1850
1851 if (chan->state != BT_CONNECTED)
1852 return -ENOTCONN;
1853
1854 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1855 return 0;
1856
1857 if (__chan_is_moving(chan))
1858 return 0;
1859
1860 while (chan->tx_send_head &&
1861 chan->unacked_frames < chan->remote_tx_win &&
1862 chan->tx_state == L2CAP_TX_STATE_XMIT) {
1863
1864 skb = chan->tx_send_head;
1865
1866 bt_cb(skb)->control.retries = 1;
1867 control = &bt_cb(skb)->control;
1868
1869 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1870 control->final = 1;
1871
1872 control->reqseq = chan->buffer_seq;
1873 chan->last_acked_seq = chan->buffer_seq;
1874 control->txseq = chan->next_tx_seq;
1875
1876 __pack_control(chan, control, skb);
1877
1878 if (chan->fcs == L2CAP_FCS_CRC16) {
1879 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1880 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1881 }
1882
1883 /* Clone after data has been modified. Data is assumed to be
1884 read-only (for locking purposes) on cloned sk_buffs.
1885 */
1886 tx_skb = skb_clone(skb, GFP_KERNEL);
1887
1888 if (!tx_skb)
1889 break;
1890
1891 __set_retrans_timer(chan);
1892
1893 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1894 chan->unacked_frames++;
1895 chan->frames_sent++;
1896 sent++;
1897
1898 if (skb_queue_is_last(&chan->tx_q, skb))
1899 chan->tx_send_head = NULL;
1900 else
1901 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
1902
1903 l2cap_do_send(chan, tx_skb);
1904 BT_DBG("Sent txseq %u", control->txseq);
1905 }
1906
1907 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
1908 chan->unacked_frames, skb_queue_len(&chan->tx_q));
1909
1910 return sent;
1911 }
1912
1913 static void l2cap_ertm_resend(struct l2cap_chan *chan)
1914 {
1915 struct l2cap_ctrl control;
1916 struct sk_buff *skb;
1917 struct sk_buff *tx_skb;
1918 u16 seq;
1919
1920 BT_DBG("chan %p", chan);
1921
1922 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1923 return;
1924
1925 if (__chan_is_moving(chan))
1926 return;
1927
1928 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
1929 seq = l2cap_seq_list_pop(&chan->retrans_list);
1930
1931 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
1932 if (!skb) {
1933 BT_DBG("Error: Can't retransmit seq %d, frame missing",
1934 seq);
1935 continue;
1936 }
1937
1938 bt_cb(skb)->control.retries++;
1939 control = bt_cb(skb)->control;
1940
1941 if (chan->max_tx != 0 &&
1942 bt_cb(skb)->control.retries > chan->max_tx) {
1943 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
1944 l2cap_send_disconn_req(chan, ECONNRESET);
1945 l2cap_seq_list_clear(&chan->retrans_list);
1946 break;
1947 }
1948
1949 control.reqseq = chan->buffer_seq;
1950 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1951 control.final = 1;
1952 else
1953 control.final = 0;
1954
1955 if (skb_cloned(skb)) {
1956 /* Cloned sk_buffs are read-only, so we need a
1957 * writeable copy
1958 */
1959 tx_skb = skb_copy(skb, GFP_KERNEL);
1960 } else {
1961 tx_skb = skb_clone(skb, GFP_KERNEL);
1962 }
1963
1964 if (!tx_skb) {
1965 l2cap_seq_list_clear(&chan->retrans_list);
1966 break;
1967 }
1968
1969 /* Update skb contents */
1970 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
1971 put_unaligned_le32(__pack_extended_control(&control),
1972 tx_skb->data + L2CAP_HDR_SIZE);
1973 } else {
1974 put_unaligned_le16(__pack_enhanced_control(&control),
1975 tx_skb->data + L2CAP_HDR_SIZE);
1976 }
1977
1978 /* Update FCS */
1979 if (chan->fcs == L2CAP_FCS_CRC16) {
1980 u16 fcs = crc16(0, (u8 *) tx_skb->data,
1981 tx_skb->len - L2CAP_FCS_SIZE);
1982 put_unaligned_le16(fcs, skb_tail_pointer(tx_skb) -
1983 L2CAP_FCS_SIZE);
1984 }
1985
1986 l2cap_do_send(chan, tx_skb);
1987
1988 BT_DBG("Resent txseq %d", control.txseq);
1989
1990 chan->last_acked_seq = chan->buffer_seq;
1991 }
1992 }
1993
1994 static void l2cap_retransmit(struct l2cap_chan *chan,
1995 struct l2cap_ctrl *control)
1996 {
1997 BT_DBG("chan %p, control %p", chan, control);
1998
1999 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2000 l2cap_ertm_resend(chan);
2001 }
2002
2003 static void l2cap_retransmit_all(struct l2cap_chan *chan,
2004 struct l2cap_ctrl *control)
2005 {
2006 struct sk_buff *skb;
2007
2008 BT_DBG("chan %p, control %p", chan, control);
2009
2010 if (control->poll)
2011 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2012
2013 l2cap_seq_list_clear(&chan->retrans_list);
2014
2015 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2016 return;
2017
2018 if (chan->unacked_frames) {
2019 skb_queue_walk(&chan->tx_q, skb) {
2020 if (bt_cb(skb)->control.txseq == control->reqseq ||
2021 skb == chan->tx_send_head)
2022 break;
2023 }
2024
2025 skb_queue_walk_from(&chan->tx_q, skb) {
2026 if (skb == chan->tx_send_head)
2027 break;
2028
2029 l2cap_seq_list_append(&chan->retrans_list,
2030 bt_cb(skb)->control.txseq);
2031 }
2032
2033 l2cap_ertm_resend(chan);
2034 }
2035 }
2036
2037 static void l2cap_send_ack(struct l2cap_chan *chan)
2038 {
2039 struct l2cap_ctrl control;
2040 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2041 chan->last_acked_seq);
2042 int threshold;
2043
2044 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2045 chan, chan->last_acked_seq, chan->buffer_seq);
2046
2047 memset(&control, 0, sizeof(control));
2048 control.sframe = 1;
2049
2050 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2051 chan->rx_state == L2CAP_RX_STATE_RECV) {
2052 __clear_ack_timer(chan);
2053 control.super = L2CAP_SUPER_RNR;
2054 control.reqseq = chan->buffer_seq;
2055 l2cap_send_sframe(chan, &control);
2056 } else {
2057 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2058 l2cap_ertm_send(chan);
2059 /* If any i-frames were sent, they included an ack */
2060 if (chan->buffer_seq == chan->last_acked_seq)
2061 frames_to_ack = 0;
2062 }
2063
2064 /* Ack now if the window is 3/4ths full.
2065 * Calculate without mul or div
2066 */
2067 threshold = chan->ack_win;
2068 threshold += threshold << 1;
2069 threshold >>= 2;
2070
2071 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
2072 threshold);
2073
2074 if (frames_to_ack >= threshold) {
2075 __clear_ack_timer(chan);
2076 control.super = L2CAP_SUPER_RR;
2077 control.reqseq = chan->buffer_seq;
2078 l2cap_send_sframe(chan, &control);
2079 frames_to_ack = 0;
2080 }
2081
2082 if (frames_to_ack)
2083 __set_ack_timer(chan);
2084 }
2085 }
2086
2087 static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2088 struct msghdr *msg, int len,
2089 int count, struct sk_buff *skb)
2090 {
2091 struct l2cap_conn *conn = chan->conn;
2092 struct sk_buff **frag;
2093 int sent = 0;
2094
2095 if (chan->ops->memcpy_fromiovec(chan, skb_put(skb, count),
2096 msg->msg_iov, count))
2097 return -EFAULT;
2098
2099 sent += count;
2100 len -= count;
2101
2102 /* Continuation fragments (no L2CAP header) */
2103 frag = &skb_shinfo(skb)->frag_list;
2104 while (len) {
2105 struct sk_buff *tmp;
2106
2107 count = min_t(unsigned int, conn->mtu, len);
2108
2109 tmp = chan->ops->alloc_skb(chan, 0, count,
2110 msg->msg_flags & MSG_DONTWAIT);
2111 if (IS_ERR(tmp))
2112 return PTR_ERR(tmp);
2113
2114 *frag = tmp;
2115
2116 if (chan->ops->memcpy_fromiovec(chan, skb_put(*frag, count),
2117 msg->msg_iov, count))
2118 return -EFAULT;
2119
2120 sent += count;
2121 len -= count;
2122
2123 skb->len += (*frag)->len;
2124 skb->data_len += (*frag)->len;
2125
2126 frag = &(*frag)->next;
2127 }
2128
2129 return sent;
2130 }
2131
2132 static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
2133 struct msghdr *msg, size_t len)
2134 {
2135 struct l2cap_conn *conn = chan->conn;
2136 struct sk_buff *skb;
2137 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
2138 struct l2cap_hdr *lh;
2139
2140 BT_DBG("chan %p psm 0x%2.2x len %zu", chan,
2141 __le16_to_cpu(chan->psm), len);
2142
2143 count = min_t(unsigned int, (conn->mtu - hlen), len);
2144
2145 skb = chan->ops->alloc_skb(chan, hlen, count,
2146 msg->msg_flags & MSG_DONTWAIT);
2147 if (IS_ERR(skb))
2148 return skb;
2149
2150 /* Create L2CAP header */
2151 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2152 lh->cid = cpu_to_le16(chan->dcid);
2153 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2154 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
2155
2156 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2157 if (unlikely(err < 0)) {
2158 kfree_skb(skb);
2159 return ERR_PTR(err);
2160 }
2161 return skb;
2162 }
2163
2164 static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
2165 struct msghdr *msg, size_t len)
2166 {
2167 struct l2cap_conn *conn = chan->conn;
2168 struct sk_buff *skb;
2169 int err, count;
2170 struct l2cap_hdr *lh;
2171
2172 BT_DBG("chan %p len %zu", chan, len);
2173
2174 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2175
2176 skb = chan->ops->alloc_skb(chan, L2CAP_HDR_SIZE, count,
2177 msg->msg_flags & MSG_DONTWAIT);
2178 if (IS_ERR(skb))
2179 return skb;
2180
2181 /* Create L2CAP header */
2182 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2183 lh->cid = cpu_to_le16(chan->dcid);
2184 lh->len = cpu_to_le16(len);
2185
2186 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2187 if (unlikely(err < 0)) {
2188 kfree_skb(skb);
2189 return ERR_PTR(err);
2190 }
2191 return skb;
2192 }
2193
2194 static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
2195 struct msghdr *msg, size_t len,
2196 u16 sdulen)
2197 {
2198 struct l2cap_conn *conn = chan->conn;
2199 struct sk_buff *skb;
2200 int err, count, hlen;
2201 struct l2cap_hdr *lh;
2202
2203 BT_DBG("chan %p len %zu", chan, len);
2204
2205 if (!conn)
2206 return ERR_PTR(-ENOTCONN);
2207
2208 hlen = __ertm_hdr_size(chan);
2209
2210 if (sdulen)
2211 hlen += L2CAP_SDULEN_SIZE;
2212
2213 if (chan->fcs == L2CAP_FCS_CRC16)
2214 hlen += L2CAP_FCS_SIZE;
2215
2216 count = min_t(unsigned int, (conn->mtu - hlen), len);
2217
2218 skb = chan->ops->alloc_skb(chan, hlen, count,
2219 msg->msg_flags & MSG_DONTWAIT);
2220 if (IS_ERR(skb))
2221 return skb;
2222
2223 /* Create L2CAP header */
2224 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2225 lh->cid = cpu_to_le16(chan->dcid);
2226 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2227
2228 /* Control header is populated later */
2229 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2230 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2231 else
2232 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
2233
2234 if (sdulen)
2235 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2236
2237 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2238 if (unlikely(err < 0)) {
2239 kfree_skb(skb);
2240 return ERR_PTR(err);
2241 }
2242
2243 bt_cb(skb)->control.fcs = chan->fcs;
2244 bt_cb(skb)->control.retries = 0;
2245 return skb;
2246 }
2247
2248 static int l2cap_segment_sdu(struct l2cap_chan *chan,
2249 struct sk_buff_head *seg_queue,
2250 struct msghdr *msg, size_t len)
2251 {
2252 struct sk_buff *skb;
2253 u16 sdu_len;
2254 size_t pdu_len;
2255 u8 sar;
2256
2257 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2258
2259 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2260 * so fragmented skbs are not used. The HCI layer's handling
2261 * of fragmented skbs is not compatible with ERTM's queueing.
2262 */
2263
2264 /* PDU size is derived from the HCI MTU */
2265 pdu_len = chan->conn->mtu;
2266
2267 /* Constrain PDU size for BR/EDR connections */
2268 if (!chan->hs_hcon)
2269 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2270
2271 /* Adjust for largest possible L2CAP overhead. */
2272 if (chan->fcs)
2273 pdu_len -= L2CAP_FCS_SIZE;
2274
2275 pdu_len -= __ertm_hdr_size(chan);
2276
2277 /* Remote device may have requested smaller PDUs */
2278 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2279
2280 if (len <= pdu_len) {
2281 sar = L2CAP_SAR_UNSEGMENTED;
2282 sdu_len = 0;
2283 pdu_len = len;
2284 } else {
2285 sar = L2CAP_SAR_START;
2286 sdu_len = len;
2287 }
2288
2289 while (len > 0) {
2290 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
2291
2292 if (IS_ERR(skb)) {
2293 __skb_queue_purge(seg_queue);
2294 return PTR_ERR(skb);
2295 }
2296
2297 bt_cb(skb)->control.sar = sar;
2298 __skb_queue_tail(seg_queue, skb);
2299
2300 len -= pdu_len;
2301 if (sdu_len)
2302 sdu_len = 0;
2303
2304 if (len <= pdu_len) {
2305 sar = L2CAP_SAR_END;
2306 pdu_len = len;
2307 } else {
2308 sar = L2CAP_SAR_CONTINUE;
2309 }
2310 }
2311
2312 return 0;
2313 }
2314
2315 static struct sk_buff *l2cap_create_le_flowctl_pdu(struct l2cap_chan *chan,
2316 struct msghdr *msg,
2317 size_t len, u16 sdulen)
2318 {
2319 struct l2cap_conn *conn = chan->conn;
2320 struct sk_buff *skb;
2321 int err, count, hlen;
2322 struct l2cap_hdr *lh;
2323
2324 BT_DBG("chan %p len %zu", chan, len);
2325
2326 if (!conn)
2327 return ERR_PTR(-ENOTCONN);
2328
2329 hlen = L2CAP_HDR_SIZE;
2330
2331 if (sdulen)
2332 hlen += L2CAP_SDULEN_SIZE;
2333
2334 count = min_t(unsigned int, (conn->mtu - hlen), len);
2335
2336 skb = chan->ops->alloc_skb(chan, hlen, count,
2337 msg->msg_flags & MSG_DONTWAIT);
2338 if (IS_ERR(skb))
2339 return skb;
2340
2341 /* Create L2CAP header */
2342 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2343 lh->cid = cpu_to_le16(chan->dcid);
2344 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2345
2346 if (sdulen)
2347 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2348
2349 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2350 if (unlikely(err < 0)) {
2351 kfree_skb(skb);
2352 return ERR_PTR(err);
2353 }
2354
2355 return skb;
2356 }
2357
2358 static int l2cap_segment_le_sdu(struct l2cap_chan *chan,
2359 struct sk_buff_head *seg_queue,
2360 struct msghdr *msg, size_t len)
2361 {
2362 struct sk_buff *skb;
2363 size_t pdu_len;
2364 u16 sdu_len;
2365
2366 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2367
2368 sdu_len = len;
2369 pdu_len = chan->remote_mps - L2CAP_SDULEN_SIZE;
2370
2371 while (len > 0) {
2372 if (len <= pdu_len)
2373 pdu_len = len;
2374
2375 skb = l2cap_create_le_flowctl_pdu(chan, msg, pdu_len, sdu_len);
2376 if (IS_ERR(skb)) {
2377 __skb_queue_purge(seg_queue);
2378 return PTR_ERR(skb);
2379 }
2380
2381 __skb_queue_tail(seg_queue, skb);
2382
2383 len -= pdu_len;
2384
2385 if (sdu_len) {
2386 sdu_len = 0;
2387 pdu_len += L2CAP_SDULEN_SIZE;
2388 }
2389 }
2390
2391 return 0;
2392 }
2393
2394 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len)
2395 {
2396 struct sk_buff *skb;
2397 int err;
2398 struct sk_buff_head seg_queue;
2399
2400 if (!chan->conn)
2401 return -ENOTCONN;
2402
2403 /* Connectionless channel */
2404 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
2405 skb = l2cap_create_connless_pdu(chan, msg, len);
2406 if (IS_ERR(skb))
2407 return PTR_ERR(skb);
2408
2409 /* Channel lock is released before requesting new skb and then
2410 * reacquired thus we need to recheck channel state.
2411 */
2412 if (chan->state != BT_CONNECTED) {
2413 kfree_skb(skb);
2414 return -ENOTCONN;
2415 }
2416
2417 l2cap_do_send(chan, skb);
2418 return len;
2419 }
2420
2421 switch (chan->mode) {
2422 case L2CAP_MODE_LE_FLOWCTL:
2423 /* Check outgoing MTU */
2424 if (len > chan->omtu)
2425 return -EMSGSIZE;
2426
2427 if (!chan->tx_credits)
2428 return -EAGAIN;
2429
2430 __skb_queue_head_init(&seg_queue);
2431
2432 err = l2cap_segment_le_sdu(chan, &seg_queue, msg, len);
2433
2434 if (chan->state != BT_CONNECTED) {
2435 __skb_queue_purge(&seg_queue);
2436 err = -ENOTCONN;
2437 }
2438
2439 if (err)
2440 return err;
2441
2442 skb_queue_splice_tail_init(&seg_queue, &chan->tx_q);
2443
2444 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
2445 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
2446 chan->tx_credits--;
2447 }
2448
2449 if (!chan->tx_credits)
2450 chan->ops->suspend(chan);
2451
2452 err = len;
2453
2454 break;
2455
2456 case L2CAP_MODE_BASIC:
2457 /* Check outgoing MTU */
2458 if (len > chan->omtu)
2459 return -EMSGSIZE;
2460
2461 /* Create a basic PDU */
2462 skb = l2cap_create_basic_pdu(chan, msg, len);
2463 if (IS_ERR(skb))
2464 return PTR_ERR(skb);
2465
2466 /* Channel lock is released before requesting new skb and then
2467 * reacquired thus we need to recheck channel state.
2468 */
2469 if (chan->state != BT_CONNECTED) {
2470 kfree_skb(skb);
2471 return -ENOTCONN;
2472 }
2473
2474 l2cap_do_send(chan, skb);
2475 err = len;
2476 break;
2477
2478 case L2CAP_MODE_ERTM:
2479 case L2CAP_MODE_STREAMING:
2480 /* Check outgoing MTU */
2481 if (len > chan->omtu) {
2482 err = -EMSGSIZE;
2483 break;
2484 }
2485
2486 __skb_queue_head_init(&seg_queue);
2487
2488 /* Do segmentation before calling in to the state machine,
2489 * since it's possible to block while waiting for memory
2490 * allocation.
2491 */
2492 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
2493
2494 /* The channel could have been closed while segmenting,
2495 * check that it is still connected.
2496 */
2497 if (chan->state != BT_CONNECTED) {
2498 __skb_queue_purge(&seg_queue);
2499 err = -ENOTCONN;
2500 }
2501
2502 if (err)
2503 break;
2504
2505 if (chan->mode == L2CAP_MODE_ERTM)
2506 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
2507 else
2508 l2cap_streaming_send(chan, &seg_queue);
2509
2510 err = len;
2511
2512 /* If the skbs were not queued for sending, they'll still be in
2513 * seg_queue and need to be purged.
2514 */
2515 __skb_queue_purge(&seg_queue);
2516 break;
2517
2518 default:
2519 BT_DBG("bad state %1.1x", chan->mode);
2520 err = -EBADFD;
2521 }
2522
2523 return err;
2524 }
2525 EXPORT_SYMBOL_GPL(l2cap_chan_send);
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 if (chan->chan_type != L2CAP_CHAN_RAW)
2829 continue;
2830
2831 /* Don't send frame to the channel it came from */
2832 if (bt_cb(skb)->chan == chan)
2833 continue;
2834
2835 nskb = skb_clone(skb, GFP_KERNEL);
2836 if (!nskb)
2837 continue;
2838 if (chan->ops->recv(chan, nskb))
2839 kfree_skb(nskb);
2840 }
2841
2842 mutex_unlock(&conn->chan_lock);
2843 }
2844
2845 /* ---- L2CAP signalling commands ---- */
2846 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2847 u8 ident, u16 dlen, void *data)
2848 {
2849 struct sk_buff *skb, **frag;
2850 struct l2cap_cmd_hdr *cmd;
2851 struct l2cap_hdr *lh;
2852 int len, count;
2853
2854 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2855 conn, code, ident, dlen);
2856
2857 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2858 return NULL;
2859
2860 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2861 count = min_t(unsigned int, conn->mtu, len);
2862
2863 skb = bt_skb_alloc(count, GFP_KERNEL);
2864 if (!skb)
2865 return NULL;
2866
2867 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2868 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
2869
2870 if (conn->hcon->type == LE_LINK)
2871 lh->cid = cpu_to_le16(L2CAP_CID_LE_SIGNALING);
2872 else
2873 lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING);
2874
2875 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2876 cmd->code = code;
2877 cmd->ident = ident;
2878 cmd->len = cpu_to_le16(dlen);
2879
2880 if (dlen) {
2881 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2882 memcpy(skb_put(skb, count), data, count);
2883 data += count;
2884 }
2885
2886 len -= skb->len;
2887
2888 /* Continuation fragments (no L2CAP header) */
2889 frag = &skb_shinfo(skb)->frag_list;
2890 while (len) {
2891 count = min_t(unsigned int, conn->mtu, len);
2892
2893 *frag = bt_skb_alloc(count, GFP_KERNEL);
2894 if (!*frag)
2895 goto fail;
2896
2897 memcpy(skb_put(*frag, count), data, count);
2898
2899 len -= count;
2900 data += count;
2901
2902 frag = &(*frag)->next;
2903 }
2904
2905 return skb;
2906
2907 fail:
2908 kfree_skb(skb);
2909 return NULL;
2910 }
2911
2912 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2913 unsigned long *val)
2914 {
2915 struct l2cap_conf_opt *opt = *ptr;
2916 int len;
2917
2918 len = L2CAP_CONF_OPT_SIZE + opt->len;
2919 *ptr += len;
2920
2921 *type = opt->type;
2922 *olen = opt->len;
2923
2924 switch (opt->len) {
2925 case 1:
2926 *val = *((u8 *) opt->val);
2927 break;
2928
2929 case 2:
2930 *val = get_unaligned_le16(opt->val);
2931 break;
2932
2933 case 4:
2934 *val = get_unaligned_le32(opt->val);
2935 break;
2936
2937 default:
2938 *val = (unsigned long) opt->val;
2939 break;
2940 }
2941
2942 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
2943 return len;
2944 }
2945
2946 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2947 {
2948 struct l2cap_conf_opt *opt = *ptr;
2949
2950 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
2951
2952 opt->type = type;
2953 opt->len = len;
2954
2955 switch (len) {
2956 case 1:
2957 *((u8 *) opt->val) = val;
2958 break;
2959
2960 case 2:
2961 put_unaligned_le16(val, opt->val);
2962 break;
2963
2964 case 4:
2965 put_unaligned_le32(val, opt->val);
2966 break;
2967
2968 default:
2969 memcpy(opt->val, (void *) val, len);
2970 break;
2971 }
2972
2973 *ptr += L2CAP_CONF_OPT_SIZE + len;
2974 }
2975
2976 static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2977 {
2978 struct l2cap_conf_efs efs;
2979
2980 switch (chan->mode) {
2981 case L2CAP_MODE_ERTM:
2982 efs.id = chan->local_id;
2983 efs.stype = chan->local_stype;
2984 efs.msdu = cpu_to_le16(chan->local_msdu);
2985 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2986 efs.acc_lat = cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2987 efs.flush_to = cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
2988 break;
2989
2990 case L2CAP_MODE_STREAMING:
2991 efs.id = 1;
2992 efs.stype = L2CAP_SERV_BESTEFFORT;
2993 efs.msdu = cpu_to_le16(chan->local_msdu);
2994 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2995 efs.acc_lat = 0;
2996 efs.flush_to = 0;
2997 break;
2998
2999 default:
3000 return;
3001 }
3002
3003 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
3004 (unsigned long) &efs);
3005 }
3006
3007 static void l2cap_ack_timeout(struct work_struct *work)
3008 {
3009 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
3010 ack_timer.work);
3011 u16 frames_to_ack;
3012
3013 BT_DBG("chan %p", chan);
3014
3015 l2cap_chan_lock(chan);
3016
3017 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3018 chan->last_acked_seq);
3019
3020 if (frames_to_ack)
3021 l2cap_send_rr_or_rnr(chan, 0);
3022
3023 l2cap_chan_unlock(chan);
3024 l2cap_chan_put(chan);
3025 }
3026
3027 int l2cap_ertm_init(struct l2cap_chan *chan)
3028 {
3029 int err;
3030
3031 chan->next_tx_seq = 0;
3032 chan->expected_tx_seq = 0;
3033 chan->expected_ack_seq = 0;
3034 chan->unacked_frames = 0;
3035 chan->buffer_seq = 0;
3036 chan->frames_sent = 0;
3037 chan->last_acked_seq = 0;
3038 chan->sdu = NULL;
3039 chan->sdu_last_frag = NULL;
3040 chan->sdu_len = 0;
3041
3042 skb_queue_head_init(&chan->tx_q);
3043
3044 chan->local_amp_id = AMP_ID_BREDR;
3045 chan->move_id = AMP_ID_BREDR;
3046 chan->move_state = L2CAP_MOVE_STABLE;
3047 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3048
3049 if (chan->mode != L2CAP_MODE_ERTM)
3050 return 0;
3051
3052 chan->rx_state = L2CAP_RX_STATE_RECV;
3053 chan->tx_state = L2CAP_TX_STATE_XMIT;
3054
3055 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3056 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3057 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
3058
3059 skb_queue_head_init(&chan->srej_q);
3060
3061 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3062 if (err < 0)
3063 return err;
3064
3065 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3066 if (err < 0)
3067 l2cap_seq_list_free(&chan->srej_list);
3068
3069 return err;
3070 }
3071
3072 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3073 {
3074 switch (mode) {
3075 case L2CAP_MODE_STREAMING:
3076 case L2CAP_MODE_ERTM:
3077 if (l2cap_mode_supported(mode, remote_feat_mask))
3078 return mode;
3079 /* fall through */
3080 default:
3081 return L2CAP_MODE_BASIC;
3082 }
3083 }
3084
3085 static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
3086 {
3087 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
3088 }
3089
3090 static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
3091 {
3092 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
3093 }
3094
3095 static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3096 struct l2cap_conf_rfc *rfc)
3097 {
3098 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
3099 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3100
3101 /* Class 1 devices have must have ERTM timeouts
3102 * exceeding the Link Supervision Timeout. The
3103 * default Link Supervision Timeout for AMP
3104 * controllers is 10 seconds.
3105 *
3106 * Class 1 devices use 0xffffffff for their
3107 * best-effort flush timeout, so the clamping logic
3108 * will result in a timeout that meets the above
3109 * requirement. ERTM timeouts are 16-bit values, so
3110 * the maximum timeout is 65.535 seconds.
3111 */
3112
3113 /* Convert timeout to milliseconds and round */
3114 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3115
3116 /* This is the recommended formula for class 2 devices
3117 * that start ERTM timers when packets are sent to the
3118 * controller.
3119 */
3120 ertm_to = 3 * ertm_to + 500;
3121
3122 if (ertm_to > 0xffff)
3123 ertm_to = 0xffff;
3124
3125 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3126 rfc->monitor_timeout = rfc->retrans_timeout;
3127 } else {
3128 rfc->retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3129 rfc->monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3130 }
3131 }
3132
3133 static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3134 {
3135 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
3136 __l2cap_ews_supported(chan->conn)) {
3137 /* use extended control field */
3138 set_bit(FLAG_EXT_CTRL, &chan->flags);
3139 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3140 } else {
3141 chan->tx_win = min_t(u16, chan->tx_win,
3142 L2CAP_DEFAULT_TX_WINDOW);
3143 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3144 }
3145 chan->ack_win = chan->tx_win;
3146 }
3147
3148 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
3149 {
3150 struct l2cap_conf_req *req = data;
3151 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
3152 void *ptr = req->data;
3153 u16 size;
3154
3155 BT_DBG("chan %p", chan);
3156
3157 if (chan->num_conf_req || chan->num_conf_rsp)
3158 goto done;
3159
3160 switch (chan->mode) {
3161 case L2CAP_MODE_STREAMING:
3162 case L2CAP_MODE_ERTM:
3163 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
3164 break;
3165
3166 if (__l2cap_efs_supported(chan->conn))
3167 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3168
3169 /* fall through */
3170 default:
3171 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
3172 break;
3173 }
3174
3175 done:
3176 if (chan->imtu != L2CAP_DEFAULT_MTU)
3177 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
3178
3179 switch (chan->mode) {
3180 case L2CAP_MODE_BASIC:
3181 if (disable_ertm)
3182 break;
3183
3184 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
3185 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
3186 break;
3187
3188 rfc.mode = L2CAP_MODE_BASIC;
3189 rfc.txwin_size = 0;
3190 rfc.max_transmit = 0;
3191 rfc.retrans_timeout = 0;
3192 rfc.monitor_timeout = 0;
3193 rfc.max_pdu_size = 0;
3194
3195 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3196 (unsigned long) &rfc);
3197 break;
3198
3199 case L2CAP_MODE_ERTM:
3200 rfc.mode = L2CAP_MODE_ERTM;
3201 rfc.max_transmit = chan->max_tx;
3202
3203 __l2cap_set_ertm_timeouts(chan, &rfc);
3204
3205 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3206 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3207 L2CAP_FCS_SIZE);
3208 rfc.max_pdu_size = cpu_to_le16(size);
3209
3210 l2cap_txwin_setup(chan);
3211
3212 rfc.txwin_size = min_t(u16, chan->tx_win,
3213 L2CAP_DEFAULT_TX_WINDOW);
3214
3215 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3216 (unsigned long) &rfc);
3217
3218 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3219 l2cap_add_opt_efs(&ptr, chan);
3220
3221 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3222 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3223 chan->tx_win);
3224
3225 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3226 if (chan->fcs == L2CAP_FCS_NONE ||
3227 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3228 chan->fcs = L2CAP_FCS_NONE;
3229 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3230 chan->fcs);
3231 }
3232 break;
3233
3234 case L2CAP_MODE_STREAMING:
3235 l2cap_txwin_setup(chan);
3236 rfc.mode = L2CAP_MODE_STREAMING;
3237 rfc.txwin_size = 0;
3238 rfc.max_transmit = 0;
3239 rfc.retrans_timeout = 0;
3240 rfc.monitor_timeout = 0;
3241
3242 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3243 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3244 L2CAP_FCS_SIZE);
3245 rfc.max_pdu_size = cpu_to_le16(size);
3246
3247 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3248 (unsigned long) &rfc);
3249
3250 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3251 l2cap_add_opt_efs(&ptr, chan);
3252
3253 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3254 if (chan->fcs == L2CAP_FCS_NONE ||
3255 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3256 chan->fcs = L2CAP_FCS_NONE;
3257 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3258 chan->fcs);
3259 }
3260 break;
3261 }
3262
3263 req->dcid = cpu_to_le16(chan->dcid);
3264 req->flags = cpu_to_le16(0);
3265
3266 return ptr - data;
3267 }
3268
3269 static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
3270 {
3271 struct l2cap_conf_rsp *rsp = data;
3272 void *ptr = rsp->data;
3273 void *req = chan->conf_req;
3274 int len = chan->conf_len;
3275 int type, hint, olen;
3276 unsigned long val;
3277 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3278 struct l2cap_conf_efs efs;
3279 u8 remote_efs = 0;
3280 u16 mtu = L2CAP_DEFAULT_MTU;
3281 u16 result = L2CAP_CONF_SUCCESS;
3282 u16 size;
3283
3284 BT_DBG("chan %p", chan);
3285
3286 while (len >= L2CAP_CONF_OPT_SIZE) {
3287 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
3288
3289 hint = type & L2CAP_CONF_HINT;
3290 type &= L2CAP_CONF_MASK;
3291
3292 switch (type) {
3293 case L2CAP_CONF_MTU:
3294 mtu = val;
3295 break;
3296
3297 case L2CAP_CONF_FLUSH_TO:
3298 chan->flush_to = val;
3299 break;
3300
3301 case L2CAP_CONF_QOS:
3302 break;
3303
3304 case L2CAP_CONF_RFC:
3305 if (olen == sizeof(rfc))
3306 memcpy(&rfc, (void *) val, olen);
3307 break;
3308
3309 case L2CAP_CONF_FCS:
3310 if (val == L2CAP_FCS_NONE)
3311 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
3312 break;
3313
3314 case L2CAP_CONF_EFS:
3315 remote_efs = 1;
3316 if (olen == sizeof(efs))
3317 memcpy(&efs, (void *) val, olen);
3318 break;
3319
3320 case L2CAP_CONF_EWS:
3321 if (!chan->conn->hs_enabled)
3322 return -ECONNREFUSED;
3323
3324 set_bit(FLAG_EXT_CTRL, &chan->flags);
3325 set_bit(CONF_EWS_RECV, &chan->conf_state);
3326 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3327 chan->remote_tx_win = val;
3328 break;
3329
3330 default:
3331 if (hint)
3332 break;
3333
3334 result = L2CAP_CONF_UNKNOWN;
3335 *((u8 *) ptr++) = type;
3336 break;
3337 }
3338 }
3339
3340 if (chan->num_conf_rsp || chan->num_conf_req > 1)
3341 goto done;
3342
3343 switch (chan->mode) {
3344 case L2CAP_MODE_STREAMING:
3345 case L2CAP_MODE_ERTM:
3346 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
3347 chan->mode = l2cap_select_mode(rfc.mode,
3348 chan->conn->feat_mask);
3349 break;
3350 }
3351
3352 if (remote_efs) {
3353 if (__l2cap_efs_supported(chan->conn))
3354 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3355 else
3356 return -ECONNREFUSED;
3357 }
3358
3359 if (chan->mode != rfc.mode)
3360 return -ECONNREFUSED;
3361
3362 break;
3363 }
3364
3365 done:
3366 if (chan->mode != rfc.mode) {
3367 result = L2CAP_CONF_UNACCEPT;
3368 rfc.mode = chan->mode;
3369
3370 if (chan->num_conf_rsp == 1)
3371 return -ECONNREFUSED;
3372
3373 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3374 (unsigned long) &rfc);
3375 }
3376
3377 if (result == L2CAP_CONF_SUCCESS) {
3378 /* Configure output options and let the other side know
3379 * which ones we don't like. */
3380
3381 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3382 result = L2CAP_CONF_UNACCEPT;
3383 else {
3384 chan->omtu = mtu;
3385 set_bit(CONF_MTU_DONE, &chan->conf_state);
3386 }
3387 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
3388
3389 if (remote_efs) {
3390 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3391 efs.stype != L2CAP_SERV_NOTRAFIC &&
3392 efs.stype != chan->local_stype) {
3393
3394 result = L2CAP_CONF_UNACCEPT;
3395
3396 if (chan->num_conf_req >= 1)
3397 return -ECONNREFUSED;
3398
3399 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3400 sizeof(efs),
3401 (unsigned long) &efs);
3402 } else {
3403 /* Send PENDING Conf Rsp */
3404 result = L2CAP_CONF_PENDING;
3405 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3406 }
3407 }
3408
3409 switch (rfc.mode) {
3410 case L2CAP_MODE_BASIC:
3411 chan->fcs = L2CAP_FCS_NONE;
3412 set_bit(CONF_MODE_DONE, &chan->conf_state);
3413 break;
3414
3415 case L2CAP_MODE_ERTM:
3416 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3417 chan->remote_tx_win = rfc.txwin_size;
3418 else
3419 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
3420
3421 chan->remote_max_tx = rfc.max_transmit;
3422
3423 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3424 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3425 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3426 rfc.max_pdu_size = cpu_to_le16(size);
3427 chan->remote_mps = size;
3428
3429 __l2cap_set_ertm_timeouts(chan, &rfc);
3430
3431 set_bit(CONF_MODE_DONE, &chan->conf_state);
3432
3433 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3434 sizeof(rfc), (unsigned long) &rfc);
3435
3436 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3437 chan->remote_id = efs.id;
3438 chan->remote_stype = efs.stype;
3439 chan->remote_msdu = le16_to_cpu(efs.msdu);
3440 chan->remote_flush_to =
3441 le32_to_cpu(efs.flush_to);
3442 chan->remote_acc_lat =
3443 le32_to_cpu(efs.acc_lat);
3444 chan->remote_sdu_itime =
3445 le32_to_cpu(efs.sdu_itime);
3446 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3447 sizeof(efs),
3448 (unsigned long) &efs);
3449 }
3450 break;
3451
3452 case L2CAP_MODE_STREAMING:
3453 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3454 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3455 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3456 rfc.max_pdu_size = cpu_to_le16(size);
3457 chan->remote_mps = size;
3458
3459 set_bit(CONF_MODE_DONE, &chan->conf_state);
3460
3461 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3462 (unsigned long) &rfc);
3463
3464 break;
3465
3466 default:
3467 result = L2CAP_CONF_UNACCEPT;
3468
3469 memset(&rfc, 0, sizeof(rfc));
3470 rfc.mode = chan->mode;
3471 }
3472
3473 if (result == L2CAP_CONF_SUCCESS)
3474 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3475 }
3476 rsp->scid = cpu_to_le16(chan->dcid);
3477 rsp->result = cpu_to_le16(result);
3478 rsp->flags = cpu_to_le16(0);
3479
3480 return ptr - data;
3481 }
3482
3483 static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3484 void *data, u16 *result)
3485 {
3486 struct l2cap_conf_req *req = data;
3487 void *ptr = req->data;
3488 int type, olen;
3489 unsigned long val;
3490 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3491 struct l2cap_conf_efs efs;
3492
3493 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
3494
3495 while (len >= L2CAP_CONF_OPT_SIZE) {
3496 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3497
3498 switch (type) {
3499 case L2CAP_CONF_MTU:
3500 if (val < L2CAP_DEFAULT_MIN_MTU) {
3501 *result = L2CAP_CONF_UNACCEPT;
3502 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
3503 } else
3504 chan->imtu = val;
3505 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
3506 break;
3507
3508 case L2CAP_CONF_FLUSH_TO:
3509 chan->flush_to = val;
3510 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
3511 2, chan->flush_to);
3512 break;
3513
3514 case L2CAP_CONF_RFC:
3515 if (olen == sizeof(rfc))
3516 memcpy(&rfc, (void *)val, olen);
3517
3518 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
3519 rfc.mode != chan->mode)
3520 return -ECONNREFUSED;
3521
3522 chan->fcs = 0;
3523
3524 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3525 sizeof(rfc), (unsigned long) &rfc);
3526 break;
3527
3528 case L2CAP_CONF_EWS:
3529 chan->ack_win = min_t(u16, val, chan->ack_win);
3530 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3531 chan->tx_win);
3532 break;
3533
3534 case L2CAP_CONF_EFS:
3535 if (olen == sizeof(efs))
3536 memcpy(&efs, (void *)val, olen);
3537
3538 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3539 efs.stype != L2CAP_SERV_NOTRAFIC &&
3540 efs.stype != chan->local_stype)
3541 return -ECONNREFUSED;
3542
3543 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3544 (unsigned long) &efs);
3545 break;
3546
3547 case L2CAP_CONF_FCS:
3548 if (*result == L2CAP_CONF_PENDING)
3549 if (val == L2CAP_FCS_NONE)
3550 set_bit(CONF_RECV_NO_FCS,
3551 &chan->conf_state);
3552 break;
3553 }
3554 }
3555
3556 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
3557 return -ECONNREFUSED;
3558
3559 chan->mode = rfc.mode;
3560
3561 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
3562 switch (rfc.mode) {
3563 case L2CAP_MODE_ERTM:
3564 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3565 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3566 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3567 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3568 chan->ack_win = min_t(u16, chan->ack_win,
3569 rfc.txwin_size);
3570
3571 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3572 chan->local_msdu = le16_to_cpu(efs.msdu);
3573 chan->local_sdu_itime =
3574 le32_to_cpu(efs.sdu_itime);
3575 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3576 chan->local_flush_to =
3577 le32_to_cpu(efs.flush_to);
3578 }
3579 break;
3580
3581 case L2CAP_MODE_STREAMING:
3582 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3583 }
3584 }
3585
3586 req->dcid = cpu_to_le16(chan->dcid);
3587 req->flags = cpu_to_le16(0);
3588
3589 return ptr - data;
3590 }
3591
3592 static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3593 u16 result, u16 flags)
3594 {
3595 struct l2cap_conf_rsp *rsp = data;
3596 void *ptr = rsp->data;
3597
3598 BT_DBG("chan %p", chan);
3599
3600 rsp->scid = cpu_to_le16(chan->dcid);
3601 rsp->result = cpu_to_le16(result);
3602 rsp->flags = cpu_to_le16(flags);
3603
3604 return ptr - data;
3605 }
3606
3607 void __l2cap_le_connect_rsp_defer(struct l2cap_chan *chan)
3608 {
3609 struct l2cap_le_conn_rsp rsp;
3610 struct l2cap_conn *conn = chan->conn;
3611
3612 BT_DBG("chan %p", chan);
3613
3614 rsp.dcid = cpu_to_le16(chan->scid);
3615 rsp.mtu = cpu_to_le16(chan->imtu);
3616 rsp.mps = cpu_to_le16(chan->mps);
3617 rsp.credits = cpu_to_le16(chan->rx_credits);
3618 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3619
3620 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CONN_RSP, sizeof(rsp),
3621 &rsp);
3622 }
3623
3624 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
3625 {
3626 struct l2cap_conn_rsp rsp;
3627 struct l2cap_conn *conn = chan->conn;
3628 u8 buf[128];
3629 u8 rsp_code;
3630
3631 rsp.scid = cpu_to_le16(chan->dcid);
3632 rsp.dcid = cpu_to_le16(chan->scid);
3633 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
3634 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
3635
3636 if (chan->hs_hcon)
3637 rsp_code = L2CAP_CREATE_CHAN_RSP;
3638 else
3639 rsp_code = L2CAP_CONN_RSP;
3640
3641 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3642
3643 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
3644
3645 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3646 return;
3647
3648 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3649 l2cap_build_conf_req(chan, buf), buf);
3650 chan->num_conf_req++;
3651 }
3652
3653 static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
3654 {
3655 int type, olen;
3656 unsigned long val;
3657 /* Use sane default values in case a misbehaving remote device
3658 * did not send an RFC or extended window size option.
3659 */
3660 u16 txwin_ext = chan->ack_win;
3661 struct l2cap_conf_rfc rfc = {
3662 .mode = chan->mode,
3663 .retrans_timeout = cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3664 .monitor_timeout = cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3665 .max_pdu_size = cpu_to_le16(chan->imtu),
3666 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3667 };
3668
3669 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
3670
3671 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
3672 return;
3673
3674 while (len >= L2CAP_CONF_OPT_SIZE) {
3675 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3676
3677 switch (type) {
3678 case L2CAP_CONF_RFC:
3679 if (olen == sizeof(rfc))
3680 memcpy(&rfc, (void *)val, olen);
3681 break;
3682 case L2CAP_CONF_EWS:
3683 txwin_ext = val;
3684 break;
3685 }
3686 }
3687
3688 switch (rfc.mode) {
3689 case L2CAP_MODE_ERTM:
3690 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3691 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3692 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3693 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3694 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3695 else
3696 chan->ack_win = min_t(u16, chan->ack_win,
3697 rfc.txwin_size);
3698 break;
3699 case L2CAP_MODE_STREAMING:
3700 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3701 }
3702 }
3703
3704 static inline int l2cap_command_rej(struct l2cap_conn *conn,
3705 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3706 u8 *data)
3707 {
3708 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
3709
3710 if (cmd_len < sizeof(*rej))
3711 return -EPROTO;
3712
3713 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
3714 return 0;
3715
3716 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
3717 cmd->ident == conn->info_ident) {
3718 cancel_delayed_work(&conn->info_timer);
3719
3720 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3721 conn->info_ident = 0;
3722
3723 l2cap_conn_start(conn);
3724 }
3725
3726 return 0;
3727 }
3728
3729 static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3730 struct l2cap_cmd_hdr *cmd,
3731 u8 *data, u8 rsp_code, u8 amp_id)
3732 {
3733 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3734 struct l2cap_conn_rsp rsp;
3735 struct l2cap_chan *chan = NULL, *pchan;
3736 int result, status = L2CAP_CS_NO_INFO;
3737
3738 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
3739 __le16 psm = req->psm;
3740
3741 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
3742
3743 /* Check if we have socket listening on psm */
3744 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
3745 &conn->hcon->dst, ACL_LINK);
3746 if (!pchan) {
3747 result = L2CAP_CR_BAD_PSM;
3748 goto sendresp;
3749 }
3750
3751 mutex_lock(&conn->chan_lock);
3752 l2cap_chan_lock(pchan);
3753
3754 /* Check if the ACL is secure enough (if not SDP) */
3755 if (psm != cpu_to_le16(L2CAP_PSM_SDP) &&
3756 !hci_conn_check_link_mode(conn->hcon)) {
3757 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
3758 result = L2CAP_CR_SEC_BLOCK;
3759 goto response;
3760 }
3761
3762 result = L2CAP_CR_NO_MEM;
3763
3764 /* Check if we already have channel with that dcid */
3765 if (__l2cap_get_chan_by_dcid(conn, scid))
3766 goto response;
3767
3768 chan = pchan->ops->new_connection(pchan);
3769 if (!chan)
3770 goto response;
3771
3772 /* For certain devices (ex: HID mouse), support for authentication,
3773 * pairing and bonding is optional. For such devices, inorder to avoid
3774 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3775 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3776 */
3777 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3778
3779 bacpy(&chan->src, &conn->hcon->src);
3780 bacpy(&chan->dst, &conn->hcon->dst);
3781 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3782 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
3783 chan->psm = psm;
3784 chan->dcid = scid;
3785 chan->local_amp_id = amp_id;
3786
3787 __l2cap_chan_add(conn, chan);
3788
3789 dcid = chan->scid;
3790
3791 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
3792
3793 chan->ident = cmd->ident;
3794
3795 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
3796 if (l2cap_chan_check_security(chan, false)) {
3797 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
3798 l2cap_state_change(chan, BT_CONNECT2);
3799 result = L2CAP_CR_PEND;
3800 status = L2CAP_CS_AUTHOR_PEND;
3801 chan->ops->defer(chan);
3802 } else {
3803 /* Force pending result for AMP controllers.
3804 * The connection will succeed after the
3805 * physical link is up.
3806 */
3807 if (amp_id == AMP_ID_BREDR) {
3808 l2cap_state_change(chan, BT_CONFIG);
3809 result = L2CAP_CR_SUCCESS;
3810 } else {
3811 l2cap_state_change(chan, BT_CONNECT2);
3812 result = L2CAP_CR_PEND;
3813 }
3814 status = L2CAP_CS_NO_INFO;
3815 }
3816 } else {
3817 l2cap_state_change(chan, BT_CONNECT2);
3818 result = L2CAP_CR_PEND;
3819 status = L2CAP_CS_AUTHEN_PEND;
3820 }
3821 } else {
3822 l2cap_state_change(chan, BT_CONNECT2);
3823 result = L2CAP_CR_PEND;
3824 status = L2CAP_CS_NO_INFO;
3825 }
3826
3827 response:
3828 l2cap_chan_unlock(pchan);
3829 mutex_unlock(&conn->chan_lock);
3830 l2cap_chan_put(pchan);
3831
3832 sendresp:
3833 rsp.scid = cpu_to_le16(scid);
3834 rsp.dcid = cpu_to_le16(dcid);
3835 rsp.result = cpu_to_le16(result);
3836 rsp.status = cpu_to_le16(status);
3837 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
3838
3839 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3840 struct l2cap_info_req info;
3841 info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
3842
3843 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3844 conn->info_ident = l2cap_get_ident(conn);
3845
3846 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
3847
3848 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3849 sizeof(info), &info);
3850 }
3851
3852 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
3853 result == L2CAP_CR_SUCCESS) {
3854 u8 buf[128];
3855 set_bit(CONF_REQ_SENT, &chan->conf_state);
3856 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3857 l2cap_build_conf_req(chan, buf), buf);
3858 chan->num_conf_req++;
3859 }
3860
3861 return chan;
3862 }
3863
3864 static int l2cap_connect_req(struct l2cap_conn *conn,
3865 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3866 {
3867 struct hci_dev *hdev = conn->hcon->hdev;
3868 struct hci_conn *hcon = conn->hcon;
3869
3870 if (cmd_len < sizeof(struct l2cap_conn_req))
3871 return -EPROTO;
3872
3873 hci_dev_lock(hdev);
3874 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3875 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3876 mgmt_device_connected(hdev, hcon, 0, NULL, 0);
3877 hci_dev_unlock(hdev);
3878
3879 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
3880 return 0;
3881 }
3882
3883 static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
3884 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3885 u8 *data)
3886 {
3887 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3888 u16 scid, dcid, result, status;
3889 struct l2cap_chan *chan;
3890 u8 req[128];
3891 int err;
3892
3893 if (cmd_len < sizeof(*rsp))
3894 return -EPROTO;
3895
3896 scid = __le16_to_cpu(rsp->scid);
3897 dcid = __le16_to_cpu(rsp->dcid);
3898 result = __le16_to_cpu(rsp->result);
3899 status = __le16_to_cpu(rsp->status);
3900
3901 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3902 dcid, scid, result, status);
3903
3904 mutex_lock(&conn->chan_lock);
3905
3906 if (scid) {
3907 chan = __l2cap_get_chan_by_scid(conn, scid);
3908 if (!chan) {
3909 err = -EBADSLT;
3910 goto unlock;
3911 }
3912 } else {
3913 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3914 if (!chan) {
3915 err = -EBADSLT;
3916 goto unlock;
3917 }
3918 }
3919
3920 err = 0;
3921
3922 l2cap_chan_lock(chan);
3923
3924 switch (result) {
3925 case L2CAP_CR_SUCCESS:
3926 l2cap_state_change(chan, BT_CONFIG);
3927 chan->ident = 0;
3928 chan->dcid = dcid;
3929 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
3930
3931 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3932 break;
3933
3934 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3935 l2cap_build_conf_req(chan, req), req);
3936 chan->num_conf_req++;
3937 break;
3938
3939 case L2CAP_CR_PEND:
3940 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
3941 break;
3942
3943 default:
3944 l2cap_chan_del(chan, ECONNREFUSED);
3945 break;
3946 }
3947
3948 l2cap_chan_unlock(chan);
3949
3950 unlock:
3951 mutex_unlock(&conn->chan_lock);
3952
3953 return err;
3954 }
3955
3956 static inline void set_default_fcs(struct l2cap_chan *chan)
3957 {
3958 /* FCS is enabled only in ERTM or streaming mode, if one or both
3959 * sides request it.
3960 */
3961 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
3962 chan->fcs = L2CAP_FCS_NONE;
3963 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
3964 chan->fcs = L2CAP_FCS_CRC16;
3965 }
3966
3967 static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3968 u8 ident, u16 flags)
3969 {
3970 struct l2cap_conn *conn = chan->conn;
3971
3972 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3973 flags);
3974
3975 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3976 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3977
3978 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3979 l2cap_build_conf_rsp(chan, data,
3980 L2CAP_CONF_SUCCESS, flags), data);
3981 }
3982
3983 static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
3984 u16 scid, u16 dcid)
3985 {
3986 struct l2cap_cmd_rej_cid rej;
3987
3988 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
3989 rej.scid = __cpu_to_le16(scid);
3990 rej.dcid = __cpu_to_le16(dcid);
3991
3992 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3993 }
3994
3995 static inline int l2cap_config_req(struct l2cap_conn *conn,
3996 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3997 u8 *data)
3998 {
3999 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4000 u16 dcid, flags;
4001 u8 rsp[64];
4002 struct l2cap_chan *chan;
4003 int len, err = 0;
4004
4005 if (cmd_len < sizeof(*req))
4006 return -EPROTO;
4007
4008 dcid = __le16_to_cpu(req->dcid);
4009 flags = __le16_to_cpu(req->flags);
4010
4011 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4012
4013 chan = l2cap_get_chan_by_scid(conn, dcid);
4014 if (!chan) {
4015 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4016 return 0;
4017 }
4018
4019 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
4020 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4021 chan->dcid);
4022 goto unlock;
4023 }
4024
4025 /* Reject if config buffer is too small. */
4026 len = cmd_len - sizeof(*req);
4027 if (chan->conf_len + len > sizeof(chan->conf_req)) {
4028 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4029 l2cap_build_conf_rsp(chan, rsp,
4030 L2CAP_CONF_REJECT, flags), rsp);
4031 goto unlock;
4032 }
4033
4034 /* Store config. */
4035 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4036 chan->conf_len += len;
4037
4038 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
4039 /* Incomplete config. Send empty response. */
4040 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4041 l2cap_build_conf_rsp(chan, rsp,
4042 L2CAP_CONF_SUCCESS, flags), rsp);
4043 goto unlock;
4044 }
4045
4046 /* Complete config. */
4047 len = l2cap_parse_conf_req(chan, rsp);
4048 if (len < 0) {
4049 l2cap_send_disconn_req(chan, ECONNRESET);
4050 goto unlock;
4051 }
4052
4053 chan->ident = cmd->ident;
4054 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
4055 chan->num_conf_rsp++;
4056
4057 /* Reset config buffer. */
4058 chan->conf_len = 0;
4059
4060 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
4061 goto unlock;
4062
4063 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4064 set_default_fcs(chan);
4065
4066 if (chan->mode == L2CAP_MODE_ERTM ||
4067 chan->mode == L2CAP_MODE_STREAMING)
4068 err = l2cap_ertm_init(chan);
4069
4070 if (err < 0)
4071 l2cap_send_disconn_req(chan, -err);
4072 else
4073 l2cap_chan_ready(chan);
4074
4075 goto unlock;
4076 }
4077
4078 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
4079 u8 buf[64];
4080 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
4081 l2cap_build_conf_req(chan, buf), buf);
4082 chan->num_conf_req++;
4083 }
4084
4085 /* Got Conf Rsp PENDING from remote side and assume we sent
4086 Conf Rsp PENDING in the code above */
4087 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
4088 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4089
4090 /* check compatibility */
4091
4092 /* Send rsp for BR/EDR channel */
4093 if (!chan->hs_hcon)
4094 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4095 else
4096 chan->ident = cmd->ident;
4097 }
4098
4099 unlock:
4100 l2cap_chan_unlock(chan);
4101 return err;
4102 }
4103
4104 static inline int l2cap_config_rsp(struct l2cap_conn *conn,
4105 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4106 u8 *data)
4107 {
4108 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4109 u16 scid, flags, result;
4110 struct l2cap_chan *chan;
4111 int len = cmd_len - sizeof(*rsp);
4112 int err = 0;
4113
4114 if (cmd_len < sizeof(*rsp))
4115 return -EPROTO;
4116
4117 scid = __le16_to_cpu(rsp->scid);
4118 flags = __le16_to_cpu(rsp->flags);
4119 result = __le16_to_cpu(rsp->result);
4120
4121 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4122 result, len);
4123
4124 chan = l2cap_get_chan_by_scid(conn, scid);
4125 if (!chan)
4126 return 0;
4127
4128 switch (result) {
4129 case L2CAP_CONF_SUCCESS:
4130 l2cap_conf_rfc_get(chan, rsp->data, len);
4131 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4132 break;
4133
4134 case L2CAP_CONF_PENDING:
4135 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4136
4137 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4138 char buf[64];
4139
4140 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4141 buf, &result);
4142 if (len < 0) {
4143 l2cap_send_disconn_req(chan, ECONNRESET);
4144 goto done;
4145 }
4146
4147 if (!chan->hs_hcon) {
4148 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4149 0);
4150 } else {
4151 if (l2cap_check_efs(chan)) {
4152 amp_create_logical_link(chan);
4153 chan->ident = cmd->ident;
4154 }
4155 }
4156 }
4157 goto done;
4158
4159 case L2CAP_CONF_UNACCEPT:
4160 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
4161 char req[64];
4162
4163 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
4164 l2cap_send_disconn_req(chan, ECONNRESET);
4165 goto done;
4166 }
4167
4168 /* throw out any old stored conf requests */
4169 result = L2CAP_CONF_SUCCESS;
4170 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4171 req, &result);
4172 if (len < 0) {
4173 l2cap_send_disconn_req(chan, ECONNRESET);
4174 goto done;
4175 }
4176
4177 l2cap_send_cmd(conn, l2cap_get_ident(conn),
4178 L2CAP_CONF_REQ, len, req);
4179 chan->num_conf_req++;
4180 if (result != L2CAP_CONF_SUCCESS)
4181 goto done;
4182 break;
4183 }
4184
4185 default:
4186 l2cap_chan_set_err(chan, ECONNRESET);
4187
4188 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
4189 l2cap_send_disconn_req(chan, ECONNRESET);
4190 goto done;
4191 }
4192
4193 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
4194 goto done;
4195
4196 set_bit(CONF_INPUT_DONE, &chan->conf_state);
4197
4198 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
4199 set_default_fcs(chan);
4200
4201 if (chan->mode == L2CAP_MODE_ERTM ||
4202 chan->mode == L2CAP_MODE_STREAMING)
4203 err = l2cap_ertm_init(chan);
4204
4205 if (err < 0)
4206 l2cap_send_disconn_req(chan, -err);
4207 else
4208 l2cap_chan_ready(chan);
4209 }
4210
4211 done:
4212 l2cap_chan_unlock(chan);
4213 return err;
4214 }
4215
4216 static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4217 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4218 u8 *data)
4219 {
4220 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4221 struct l2cap_disconn_rsp rsp;
4222 u16 dcid, scid;
4223 struct l2cap_chan *chan;
4224
4225 if (cmd_len != sizeof(*req))
4226 return -EPROTO;
4227
4228 scid = __le16_to_cpu(req->scid);
4229 dcid = __le16_to_cpu(req->dcid);
4230
4231 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4232
4233 mutex_lock(&conn->chan_lock);
4234
4235 chan = __l2cap_get_chan_by_scid(conn, dcid);
4236 if (!chan) {
4237 mutex_unlock(&conn->chan_lock);
4238 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4239 return 0;
4240 }
4241
4242 l2cap_chan_lock(chan);
4243
4244 rsp.dcid = cpu_to_le16(chan->scid);
4245 rsp.scid = cpu_to_le16(chan->dcid);
4246 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4247
4248 chan->ops->set_shutdown(chan);
4249
4250 l2cap_chan_hold(chan);
4251 l2cap_chan_del(chan, ECONNRESET);
4252
4253 l2cap_chan_unlock(chan);
4254
4255 chan->ops->close(chan);
4256 l2cap_chan_put(chan);
4257
4258 mutex_unlock(&conn->chan_lock);
4259
4260 return 0;
4261 }
4262
4263 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4264 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4265 u8 *data)
4266 {
4267 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4268 u16 dcid, scid;
4269 struct l2cap_chan *chan;
4270
4271 if (cmd_len != sizeof(*rsp))
4272 return -EPROTO;
4273
4274 scid = __le16_to_cpu(rsp->scid);
4275 dcid = __le16_to_cpu(rsp->dcid);
4276
4277 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4278
4279 mutex_lock(&conn->chan_lock);
4280
4281 chan = __l2cap_get_chan_by_scid(conn, scid);
4282 if (!chan) {
4283 mutex_unlock(&conn->chan_lock);
4284 return 0;
4285 }
4286
4287 l2cap_chan_lock(chan);
4288
4289 l2cap_chan_hold(chan);
4290 l2cap_chan_del(chan, 0);
4291
4292 l2cap_chan_unlock(chan);
4293
4294 chan->ops->close(chan);
4295 l2cap_chan_put(chan);
4296
4297 mutex_unlock(&conn->chan_lock);
4298
4299 return 0;
4300 }
4301
4302 static inline int l2cap_information_req(struct l2cap_conn *conn,
4303 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4304 u8 *data)
4305 {
4306 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
4307 u16 type;
4308
4309 if (cmd_len != sizeof(*req))
4310 return -EPROTO;
4311
4312 type = __le16_to_cpu(req->type);
4313
4314 BT_DBG("type 0x%4.4x", type);
4315
4316 if (type == L2CAP_IT_FEAT_MASK) {
4317 u8 buf[8];
4318 u32 feat_mask = l2cap_feat_mask;
4319 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4320 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4321 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
4322 if (!disable_ertm)
4323 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
4324 | L2CAP_FEAT_FCS;
4325 if (conn->hs_enabled)
4326 feat_mask |= L2CAP_FEAT_EXT_FLOW
4327 | L2CAP_FEAT_EXT_WINDOW;
4328
4329 put_unaligned_le32(feat_mask, rsp->data);
4330 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4331 buf);
4332 } else if (type == L2CAP_IT_FIXED_CHAN) {
4333 u8 buf[12];
4334 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4335
4336 if (conn->hs_enabled)
4337 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4338 else
4339 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4340
4341 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4342 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
4343 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
4344 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4345 buf);
4346 } else {
4347 struct l2cap_info_rsp rsp;
4348 rsp.type = cpu_to_le16(type);
4349 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
4350 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4351 &rsp);
4352 }
4353
4354 return 0;
4355 }
4356
4357 static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4358 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4359 u8 *data)
4360 {
4361 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4362 u16 type, result;
4363
4364 if (cmd_len < sizeof(*rsp))
4365 return -EPROTO;
4366
4367 type = __le16_to_cpu(rsp->type);
4368 result = __le16_to_cpu(rsp->result);
4369
4370 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4371
4372 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4373 if (cmd->ident != conn->info_ident ||
4374 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
4375 return 0;
4376
4377 cancel_delayed_work(&conn->info_timer);
4378
4379 if (result != L2CAP_IR_SUCCESS) {
4380 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4381 conn->info_ident = 0;
4382
4383 l2cap_conn_start(conn);
4384
4385 return 0;
4386 }
4387
4388 switch (type) {
4389 case L2CAP_IT_FEAT_MASK:
4390 conn->feat_mask = get_unaligned_le32(rsp->data);
4391
4392 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
4393 struct l2cap_info_req req;
4394 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4395
4396 conn->info_ident = l2cap_get_ident(conn);
4397
4398 l2cap_send_cmd(conn, conn->info_ident,
4399 L2CAP_INFO_REQ, sizeof(req), &req);
4400 } else {
4401 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4402 conn->info_ident = 0;
4403
4404 l2cap_conn_start(conn);
4405 }
4406 break;
4407
4408 case L2CAP_IT_FIXED_CHAN:
4409 conn->fixed_chan_mask = rsp->data[0];
4410 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4411 conn->info_ident = 0;
4412
4413 l2cap_conn_start(conn);
4414 break;
4415 }
4416
4417 return 0;
4418 }
4419
4420 static int l2cap_create_channel_req(struct l2cap_conn *conn,
4421 struct l2cap_cmd_hdr *cmd,
4422 u16 cmd_len, void *data)
4423 {
4424 struct l2cap_create_chan_req *req = data;
4425 struct l2cap_create_chan_rsp rsp;
4426 struct l2cap_chan *chan;
4427 struct hci_dev *hdev;
4428 u16 psm, scid;
4429
4430 if (cmd_len != sizeof(*req))
4431 return -EPROTO;
4432
4433 if (!conn->hs_enabled)
4434 return -EINVAL;
4435
4436 psm = le16_to_cpu(req->psm);
4437 scid = le16_to_cpu(req->scid);
4438
4439 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
4440
4441 /* For controller id 0 make BR/EDR connection */
4442 if (req->amp_id == AMP_ID_BREDR) {
4443 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4444 req->amp_id);
4445 return 0;
4446 }
4447
4448 /* Validate AMP controller id */
4449 hdev = hci_dev_get(req->amp_id);
4450 if (!hdev)
4451 goto error;
4452
4453 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4454 hci_dev_put(hdev);
4455 goto error;
4456 }
4457
4458 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4459 req->amp_id);
4460 if (chan) {
4461 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4462 struct hci_conn *hs_hcon;
4463
4464 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4465 &conn->hcon->dst);
4466 if (!hs_hcon) {
4467 hci_dev_put(hdev);
4468 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4469 chan->dcid);
4470 return 0;
4471 }
4472
4473 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4474
4475 mgr->bredr_chan = chan;
4476 chan->hs_hcon = hs_hcon;
4477 chan->fcs = L2CAP_FCS_NONE;
4478 conn->mtu = hdev->block_mtu;
4479 }
4480
4481 hci_dev_put(hdev);
4482
4483 return 0;
4484
4485 error:
4486 rsp.dcid = 0;
4487 rsp.scid = cpu_to_le16(scid);
4488 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4489 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4490
4491 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4492 sizeof(rsp), &rsp);
4493
4494 return 0;
4495 }
4496
4497 static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4498 {
4499 struct l2cap_move_chan_req req;
4500 u8 ident;
4501
4502 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4503
4504 ident = l2cap_get_ident(chan->conn);
4505 chan->ident = ident;
4506
4507 req.icid = cpu_to_le16(chan->scid);
4508 req.dest_amp_id = dest_amp_id;
4509
4510 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4511 &req);
4512
4513 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4514 }
4515
4516 static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
4517 {
4518 struct l2cap_move_chan_rsp rsp;
4519
4520 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4521
4522 rsp.icid = cpu_to_le16(chan->dcid);
4523 rsp.result = cpu_to_le16(result);
4524
4525 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4526 sizeof(rsp), &rsp);
4527 }
4528
4529 static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
4530 {
4531 struct l2cap_move_chan_cfm cfm;
4532
4533 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4534
4535 chan->ident = l2cap_get_ident(chan->conn);
4536
4537 cfm.icid = cpu_to_le16(chan->scid);
4538 cfm.result = cpu_to_le16(result);
4539
4540 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4541 sizeof(cfm), &cfm);
4542
4543 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4544 }
4545
4546 static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4547 {
4548 struct l2cap_move_chan_cfm cfm;
4549
4550 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4551
4552 cfm.icid = cpu_to_le16(icid);
4553 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4554
4555 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4556 sizeof(cfm), &cfm);
4557 }
4558
4559 static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
4560 u16 icid)
4561 {
4562 struct l2cap_move_chan_cfm_rsp rsp;
4563
4564 BT_DBG("icid 0x%4.4x", icid);
4565
4566 rsp.icid = cpu_to_le16(icid);
4567 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4568 }
4569
4570 static void __release_logical_link(struct l2cap_chan *chan)
4571 {
4572 chan->hs_hchan = NULL;
4573 chan->hs_hcon = NULL;
4574
4575 /* Placeholder - release the logical link */
4576 }
4577
4578 static void l2cap_logical_fail(struct l2cap_chan *chan)
4579 {
4580 /* Logical link setup failed */
4581 if (chan->state != BT_CONNECTED) {
4582 /* Create channel failure, disconnect */
4583 l2cap_send_disconn_req(chan, ECONNRESET);
4584 return;
4585 }
4586
4587 switch (chan->move_role) {
4588 case L2CAP_MOVE_ROLE_RESPONDER:
4589 l2cap_move_done(chan);
4590 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4591 break;
4592 case L2CAP_MOVE_ROLE_INITIATOR:
4593 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4594 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4595 /* Remote has only sent pending or
4596 * success responses, clean up
4597 */
4598 l2cap_move_done(chan);
4599 }
4600
4601 /* Other amp move states imply that the move
4602 * has already aborted
4603 */
4604 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4605 break;
4606 }
4607 }
4608
4609 static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4610 struct hci_chan *hchan)
4611 {
4612 struct l2cap_conf_rsp rsp;
4613
4614 chan->hs_hchan = hchan;
4615 chan->hs_hcon->l2cap_data = chan->conn;
4616
4617 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
4618
4619 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4620 int err;
4621
4622 set_default_fcs(chan);
4623
4624 err = l2cap_ertm_init(chan);
4625 if (err < 0)
4626 l2cap_send_disconn_req(chan, -err);
4627 else
4628 l2cap_chan_ready(chan);
4629 }
4630 }
4631
4632 static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4633 struct hci_chan *hchan)
4634 {
4635 chan->hs_hcon = hchan->conn;
4636 chan->hs_hcon->l2cap_data = chan->conn;
4637
4638 BT_DBG("move_state %d", chan->move_state);
4639
4640 switch (chan->move_state) {
4641 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4642 /* Move confirm will be sent after a success
4643 * response is received
4644 */
4645 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4646 break;
4647 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4648 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4649 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4650 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4651 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4652 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4653 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4654 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4655 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4656 }
4657 break;
4658 default:
4659 /* Move was not in expected state, free the channel */
4660 __release_logical_link(chan);
4661
4662 chan->move_state = L2CAP_MOVE_STABLE;
4663 }
4664 }
4665
4666 /* Call with chan locked */
4667 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4668 u8 status)
4669 {
4670 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4671
4672 if (status) {
4673 l2cap_logical_fail(chan);
4674 __release_logical_link(chan);
4675 return;
4676 }
4677
4678 if (chan->state != BT_CONNECTED) {
4679 /* Ignore logical link if channel is on BR/EDR */
4680 if (chan->local_amp_id != AMP_ID_BREDR)
4681 l2cap_logical_finish_create(chan, hchan);
4682 } else {
4683 l2cap_logical_finish_move(chan, hchan);
4684 }
4685 }
4686
4687 void l2cap_move_start(struct l2cap_chan *chan)
4688 {
4689 BT_DBG("chan %p", chan);
4690
4691 if (chan->local_amp_id == AMP_ID_BREDR) {
4692 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4693 return;
4694 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4695 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4696 /* Placeholder - start physical link setup */
4697 } else {
4698 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4699 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4700 chan->move_id = 0;
4701 l2cap_move_setup(chan);
4702 l2cap_send_move_chan_req(chan, 0);
4703 }
4704 }
4705
4706 static void l2cap_do_create(struct l2cap_chan *chan, int result,
4707 u8 local_amp_id, u8 remote_amp_id)
4708 {
4709 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4710 local_amp_id, remote_amp_id);
4711
4712 chan->fcs = L2CAP_FCS_NONE;
4713
4714 /* Outgoing channel on AMP */
4715 if (chan->state == BT_CONNECT) {
4716 if (result == L2CAP_CR_SUCCESS) {
4717 chan->local_amp_id = local_amp_id;
4718 l2cap_send_create_chan_req(chan, remote_amp_id);
4719 } else {
4720 /* Revert to BR/EDR connect */
4721 l2cap_send_conn_req(chan);
4722 }
4723
4724 return;
4725 }
4726
4727 /* Incoming channel on AMP */
4728 if (__l2cap_no_conn_pending(chan)) {
4729 struct l2cap_conn_rsp rsp;
4730 char buf[128];
4731 rsp.scid = cpu_to_le16(chan->dcid);
4732 rsp.dcid = cpu_to_le16(chan->scid);
4733
4734 if (result == L2CAP_CR_SUCCESS) {
4735 /* Send successful response */
4736 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4737 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4738 } else {
4739 /* Send negative response */
4740 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4741 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4742 }
4743
4744 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4745 sizeof(rsp), &rsp);
4746
4747 if (result == L2CAP_CR_SUCCESS) {
4748 l2cap_state_change(chan, BT_CONFIG);
4749 set_bit(CONF_REQ_SENT, &chan->conf_state);
4750 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4751 L2CAP_CONF_REQ,
4752 l2cap_build_conf_req(chan, buf), buf);
4753 chan->num_conf_req++;
4754 }
4755 }
4756 }
4757
4758 static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4759 u8 remote_amp_id)
4760 {
4761 l2cap_move_setup(chan);
4762 chan->move_id = local_amp_id;
4763 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4764
4765 l2cap_send_move_chan_req(chan, remote_amp_id);
4766 }
4767
4768 static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4769 {
4770 struct hci_chan *hchan = NULL;
4771
4772 /* Placeholder - get hci_chan for logical link */
4773
4774 if (hchan) {
4775 if (hchan->state == BT_CONNECTED) {
4776 /* Logical link is ready to go */
4777 chan->hs_hcon = hchan->conn;
4778 chan->hs_hcon->l2cap_data = chan->conn;
4779 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4780 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4781
4782 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4783 } else {
4784 /* Wait for logical link to be ready */
4785 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4786 }
4787 } else {
4788 /* Logical link not available */
4789 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4790 }
4791 }
4792
4793 static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4794 {
4795 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4796 u8 rsp_result;
4797 if (result == -EINVAL)
4798 rsp_result = L2CAP_MR_BAD_ID;
4799 else
4800 rsp_result = L2CAP_MR_NOT_ALLOWED;
4801
4802 l2cap_send_move_chan_rsp(chan, rsp_result);
4803 }
4804
4805 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4806 chan->move_state = L2CAP_MOVE_STABLE;
4807
4808 /* Restart data transmission */
4809 l2cap_ertm_send(chan);
4810 }
4811
4812 /* Invoke with locked chan */
4813 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
4814 {
4815 u8 local_amp_id = chan->local_amp_id;
4816 u8 remote_amp_id = chan->remote_amp_id;
4817
4818 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4819 chan, result, local_amp_id, remote_amp_id);
4820
4821 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4822 l2cap_chan_unlock(chan);
4823 return;
4824 }
4825
4826 if (chan->state != BT_CONNECTED) {
4827 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4828 } else if (result != L2CAP_MR_SUCCESS) {
4829 l2cap_do_move_cancel(chan, result);
4830 } else {
4831 switch (chan->move_role) {
4832 case L2CAP_MOVE_ROLE_INITIATOR:
4833 l2cap_do_move_initiate(chan, local_amp_id,
4834 remote_amp_id);
4835 break;
4836 case L2CAP_MOVE_ROLE_RESPONDER:
4837 l2cap_do_move_respond(chan, result);
4838 break;
4839 default:
4840 l2cap_do_move_cancel(chan, result);
4841 break;
4842 }
4843 }
4844 }
4845
4846 static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
4847 struct l2cap_cmd_hdr *cmd,
4848 u16 cmd_len, void *data)
4849 {
4850 struct l2cap_move_chan_req *req = data;
4851 struct l2cap_move_chan_rsp rsp;
4852 struct l2cap_chan *chan;
4853 u16 icid = 0;
4854 u16 result = L2CAP_MR_NOT_ALLOWED;
4855
4856 if (cmd_len != sizeof(*req))
4857 return -EPROTO;
4858
4859 icid = le16_to_cpu(req->icid);
4860
4861 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
4862
4863 if (!conn->hs_enabled)
4864 return -EINVAL;
4865
4866 chan = l2cap_get_chan_by_dcid(conn, icid);
4867 if (!chan) {
4868 rsp.icid = cpu_to_le16(icid);
4869 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4870 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4871 sizeof(rsp), &rsp);
4872 return 0;
4873 }
4874
4875 chan->ident = cmd->ident;
4876
4877 if (chan->scid < L2CAP_CID_DYN_START ||
4878 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4879 (chan->mode != L2CAP_MODE_ERTM &&
4880 chan->mode != L2CAP_MODE_STREAMING)) {
4881 result = L2CAP_MR_NOT_ALLOWED;
4882 goto send_move_response;
4883 }
4884
4885 if (chan->local_amp_id == req->dest_amp_id) {
4886 result = L2CAP_MR_SAME_ID;
4887 goto send_move_response;
4888 }
4889
4890 if (req->dest_amp_id != AMP_ID_BREDR) {
4891 struct hci_dev *hdev;
4892 hdev = hci_dev_get(req->dest_amp_id);
4893 if (!hdev || hdev->dev_type != HCI_AMP ||
4894 !test_bit(HCI_UP, &hdev->flags)) {
4895 if (hdev)
4896 hci_dev_put(hdev);
4897
4898 result = L2CAP_MR_BAD_ID;
4899 goto send_move_response;
4900 }
4901 hci_dev_put(hdev);
4902 }
4903
4904 /* Detect a move collision. Only send a collision response
4905 * if this side has "lost", otherwise proceed with the move.
4906 * The winner has the larger bd_addr.
4907 */
4908 if ((__chan_is_moving(chan) ||
4909 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4910 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
4911 result = L2CAP_MR_COLLISION;
4912 goto send_move_response;
4913 }
4914
4915 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4916 l2cap_move_setup(chan);
4917 chan->move_id = req->dest_amp_id;
4918 icid = chan->dcid;
4919
4920 if (req->dest_amp_id == AMP_ID_BREDR) {
4921 /* Moving to BR/EDR */
4922 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4923 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4924 result = L2CAP_MR_PEND;
4925 } else {
4926 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4927 result = L2CAP_MR_SUCCESS;
4928 }
4929 } else {
4930 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4931 /* Placeholder - uncomment when amp functions are available */
4932 /*amp_accept_physical(chan, req->dest_amp_id);*/
4933 result = L2CAP_MR_PEND;
4934 }
4935
4936 send_move_response:
4937 l2cap_send_move_chan_rsp(chan, result);
4938
4939 l2cap_chan_unlock(chan);
4940
4941 return 0;
4942 }
4943
4944 static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4945 {
4946 struct l2cap_chan *chan;
4947 struct hci_chan *hchan = NULL;
4948
4949 chan = l2cap_get_chan_by_scid(conn, icid);
4950 if (!chan) {
4951 l2cap_send_move_chan_cfm_icid(conn, icid);
4952 return;
4953 }
4954
4955 __clear_chan_timer(chan);
4956 if (result == L2CAP_MR_PEND)
4957 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4958
4959 switch (chan->move_state) {
4960 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4961 /* Move confirm will be sent when logical link
4962 * is complete.
4963 */
4964 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4965 break;
4966 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4967 if (result == L2CAP_MR_PEND) {
4968 break;
4969 } else if (test_bit(CONN_LOCAL_BUSY,
4970 &chan->conn_state)) {
4971 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4972 } else {
4973 /* Logical link is up or moving to BR/EDR,
4974 * proceed with move
4975 */
4976 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4977 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4978 }
4979 break;
4980 case L2CAP_MOVE_WAIT_RSP:
4981 /* Moving to AMP */
4982 if (result == L2CAP_MR_SUCCESS) {
4983 /* Remote is ready, send confirm immediately
4984 * after logical link is ready
4985 */
4986 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4987 } else {
4988 /* Both logical link and move success
4989 * are required to confirm
4990 */
4991 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4992 }
4993
4994 /* Placeholder - get hci_chan for logical link */
4995 if (!hchan) {
4996 /* Logical link not available */
4997 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4998 break;
4999 }
5000
5001 /* If the logical link is not yet connected, do not
5002 * send confirmation.
5003 */
5004 if (hchan->state != BT_CONNECTED)
5005 break;
5006
5007 /* Logical link is already ready to go */
5008
5009 chan->hs_hcon = hchan->conn;
5010 chan->hs_hcon->l2cap_data = chan->conn;
5011
5012 if (result == L2CAP_MR_SUCCESS) {
5013 /* Can confirm now */
5014 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5015 } else {
5016 /* Now only need move success
5017 * to confirm
5018 */
5019 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5020 }
5021
5022 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5023 break;
5024 default:
5025 /* Any other amp move state means the move failed. */
5026 chan->move_id = chan->local_amp_id;
5027 l2cap_move_done(chan);
5028 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5029 }
5030
5031 l2cap_chan_unlock(chan);
5032 }
5033
5034 static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5035 u16 result)
5036 {
5037 struct l2cap_chan *chan;
5038
5039 chan = l2cap_get_chan_by_ident(conn, ident);
5040 if (!chan) {
5041 /* Could not locate channel, icid is best guess */
5042 l2cap_send_move_chan_cfm_icid(conn, icid);
5043 return;
5044 }
5045
5046 __clear_chan_timer(chan);
5047
5048 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5049 if (result == L2CAP_MR_COLLISION) {
5050 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5051 } else {
5052 /* Cleanup - cancel move */
5053 chan->move_id = chan->local_amp_id;
5054 l2cap_move_done(chan);
5055 }
5056 }
5057
5058 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5059
5060 l2cap_chan_unlock(chan);
5061 }
5062
5063 static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5064 struct l2cap_cmd_hdr *cmd,
5065 u16 cmd_len, void *data)
5066 {
5067 struct l2cap_move_chan_rsp *rsp = data;
5068 u16 icid, result;
5069
5070 if (cmd_len != sizeof(*rsp))
5071 return -EPROTO;
5072
5073 icid = le16_to_cpu(rsp->icid);
5074 result = le16_to_cpu(rsp->result);
5075
5076 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5077
5078 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5079 l2cap_move_continue(conn, icid, result);
5080 else
5081 l2cap_move_fail(conn, cmd->ident, icid, result);
5082
5083 return 0;
5084 }
5085
5086 static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5087 struct l2cap_cmd_hdr *cmd,
5088 u16 cmd_len, void *data)
5089 {
5090 struct l2cap_move_chan_cfm *cfm = data;
5091 struct l2cap_chan *chan;
5092 u16 icid, result;
5093
5094 if (cmd_len != sizeof(*cfm))
5095 return -EPROTO;
5096
5097 icid = le16_to_cpu(cfm->icid);
5098 result = le16_to_cpu(cfm->result);
5099
5100 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5101
5102 chan = l2cap_get_chan_by_dcid(conn, icid);
5103 if (!chan) {
5104 /* Spec requires a response even if the icid was not found */
5105 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5106 return 0;
5107 }
5108
5109 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5110 if (result == L2CAP_MC_CONFIRMED) {
5111 chan->local_amp_id = chan->move_id;
5112 if (chan->local_amp_id == AMP_ID_BREDR)
5113 __release_logical_link(chan);
5114 } else {
5115 chan->move_id = chan->local_amp_id;
5116 }
5117
5118 l2cap_move_done(chan);
5119 }
5120
5121 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5122
5123 l2cap_chan_unlock(chan);
5124
5125 return 0;
5126 }
5127
5128 static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
5129 struct l2cap_cmd_hdr *cmd,
5130 u16 cmd_len, void *data)
5131 {
5132 struct l2cap_move_chan_cfm_rsp *rsp = data;
5133 struct l2cap_chan *chan;
5134 u16 icid;
5135
5136 if (cmd_len != sizeof(*rsp))
5137 return -EPROTO;
5138
5139 icid = le16_to_cpu(rsp->icid);
5140
5141 BT_DBG("icid 0x%4.4x", icid);
5142
5143 chan = l2cap_get_chan_by_scid(conn, icid);
5144 if (!chan)
5145 return 0;
5146
5147 __clear_chan_timer(chan);
5148
5149 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5150 chan->local_amp_id = chan->move_id;
5151
5152 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
5153 __release_logical_link(chan);
5154
5155 l2cap_move_done(chan);
5156 }
5157
5158 l2cap_chan_unlock(chan);
5159
5160 return 0;
5161 }
5162
5163 static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
5164 struct l2cap_cmd_hdr *cmd,
5165 u16 cmd_len, u8 *data)
5166 {
5167 struct hci_conn *hcon = conn->hcon;
5168 struct l2cap_conn_param_update_req *req;
5169 struct l2cap_conn_param_update_rsp rsp;
5170 u16 min, max, latency, to_multiplier;
5171 int err;
5172
5173 if (hcon->role != HCI_ROLE_MASTER)
5174 return -EINVAL;
5175
5176 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5177 return -EPROTO;
5178
5179 req = (struct l2cap_conn_param_update_req *) data;
5180 min = __le16_to_cpu(req->min);
5181 max = __le16_to_cpu(req->max);
5182 latency = __le16_to_cpu(req->latency);
5183 to_multiplier = __le16_to_cpu(req->to_multiplier);
5184
5185 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
5186 min, max, latency, to_multiplier);
5187
5188 memset(&rsp, 0, sizeof(rsp));
5189
5190 err = hci_check_conn_params(min, max, latency, to_multiplier);
5191 if (err)
5192 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
5193 else
5194 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
5195
5196 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
5197 sizeof(rsp), &rsp);
5198
5199 if (!err) {
5200 u8 store_hint;
5201
5202 store_hint = hci_le_conn_update(hcon, min, max, latency,
5203 to_multiplier);
5204 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
5205 store_hint, min, max, latency,
5206 to_multiplier);
5207
5208 }
5209
5210 return 0;
5211 }
5212
5213 static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5214 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5215 u8 *data)
5216 {
5217 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5218 u16 dcid, mtu, mps, credits, result;
5219 struct l2cap_chan *chan;
5220 int err;
5221
5222 if (cmd_len < sizeof(*rsp))
5223 return -EPROTO;
5224
5225 dcid = __le16_to_cpu(rsp->dcid);
5226 mtu = __le16_to_cpu(rsp->mtu);
5227 mps = __le16_to_cpu(rsp->mps);
5228 credits = __le16_to_cpu(rsp->credits);
5229 result = __le16_to_cpu(rsp->result);
5230
5231 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5232 return -EPROTO;
5233
5234 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5235 dcid, mtu, mps, credits, result);
5236
5237 mutex_lock(&conn->chan_lock);
5238
5239 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5240 if (!chan) {
5241 err = -EBADSLT;
5242 goto unlock;
5243 }
5244
5245 err = 0;
5246
5247 l2cap_chan_lock(chan);
5248
5249 switch (result) {
5250 case L2CAP_CR_SUCCESS:
5251 chan->ident = 0;
5252 chan->dcid = dcid;
5253 chan->omtu = mtu;
5254 chan->remote_mps = mps;
5255 chan->tx_credits = credits;
5256 l2cap_chan_ready(chan);
5257 break;
5258
5259 default:
5260 l2cap_chan_del(chan, ECONNREFUSED);
5261 break;
5262 }
5263
5264 l2cap_chan_unlock(chan);
5265
5266 unlock:
5267 mutex_unlock(&conn->chan_lock);
5268
5269 return err;
5270 }
5271
5272 static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
5273 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5274 u8 *data)
5275 {
5276 int err = 0;
5277
5278 switch (cmd->code) {
5279 case L2CAP_COMMAND_REJ:
5280 l2cap_command_rej(conn, cmd, cmd_len, data);
5281 break;
5282
5283 case L2CAP_CONN_REQ:
5284 err = l2cap_connect_req(conn, cmd, cmd_len, data);
5285 break;
5286
5287 case L2CAP_CONN_RSP:
5288 case L2CAP_CREATE_CHAN_RSP:
5289 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
5290 break;
5291
5292 case L2CAP_CONF_REQ:
5293 err = l2cap_config_req(conn, cmd, cmd_len, data);
5294 break;
5295
5296 case L2CAP_CONF_RSP:
5297 l2cap_config_rsp(conn, cmd, cmd_len, data);
5298 break;
5299
5300 case L2CAP_DISCONN_REQ:
5301 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5302 break;
5303
5304 case L2CAP_DISCONN_RSP:
5305 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5306 break;
5307
5308 case L2CAP_ECHO_REQ:
5309 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5310 break;
5311
5312 case L2CAP_ECHO_RSP:
5313 break;
5314
5315 case L2CAP_INFO_REQ:
5316 err = l2cap_information_req(conn, cmd, cmd_len, data);
5317 break;
5318
5319 case L2CAP_INFO_RSP:
5320 l2cap_information_rsp(conn, cmd, cmd_len, data);
5321 break;
5322
5323 case L2CAP_CREATE_CHAN_REQ:
5324 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5325 break;
5326
5327 case L2CAP_MOVE_CHAN_REQ:
5328 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5329 break;
5330
5331 case L2CAP_MOVE_CHAN_RSP:
5332 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5333 break;
5334
5335 case L2CAP_MOVE_CHAN_CFM:
5336 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5337 break;
5338
5339 case L2CAP_MOVE_CHAN_CFM_RSP:
5340 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5341 break;
5342
5343 default:
5344 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5345 err = -EINVAL;
5346 break;
5347 }
5348
5349 return err;
5350 }
5351
5352 static int l2cap_le_connect_req(struct l2cap_conn *conn,
5353 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5354 u8 *data)
5355 {
5356 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5357 struct l2cap_le_conn_rsp rsp;
5358 struct l2cap_chan *chan, *pchan;
5359 u16 dcid, scid, credits, mtu, mps;
5360 __le16 psm;
5361 u8 result;
5362
5363 if (cmd_len != sizeof(*req))
5364 return -EPROTO;
5365
5366 scid = __le16_to_cpu(req->scid);
5367 mtu = __le16_to_cpu(req->mtu);
5368 mps = __le16_to_cpu(req->mps);
5369 psm = req->psm;
5370 dcid = 0;
5371 credits = 0;
5372
5373 if (mtu < 23 || mps < 23)
5374 return -EPROTO;
5375
5376 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5377 scid, mtu, mps);
5378
5379 /* Check if we have socket listening on psm */
5380 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5381 &conn->hcon->dst, LE_LINK);
5382 if (!pchan) {
5383 result = L2CAP_CR_BAD_PSM;
5384 chan = NULL;
5385 goto response;
5386 }
5387
5388 mutex_lock(&conn->chan_lock);
5389 l2cap_chan_lock(pchan);
5390
5391 if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
5392 result = L2CAP_CR_AUTHENTICATION;
5393 chan = NULL;
5394 goto response_unlock;
5395 }
5396
5397 /* Check if we already have channel with that dcid */
5398 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5399 result = L2CAP_CR_NO_MEM;
5400 chan = NULL;
5401 goto response_unlock;
5402 }
5403
5404 chan = pchan->ops->new_connection(pchan);
5405 if (!chan) {
5406 result = L2CAP_CR_NO_MEM;
5407 goto response_unlock;
5408 }
5409
5410 l2cap_le_flowctl_init(chan);
5411
5412 bacpy(&chan->src, &conn->hcon->src);
5413 bacpy(&chan->dst, &conn->hcon->dst);
5414 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
5415 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
5416 chan->psm = psm;
5417 chan->dcid = scid;
5418 chan->omtu = mtu;
5419 chan->remote_mps = mps;
5420 chan->tx_credits = __le16_to_cpu(req->credits);
5421
5422 __l2cap_chan_add(conn, chan);
5423 dcid = chan->scid;
5424 credits = chan->rx_credits;
5425
5426 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5427
5428 chan->ident = cmd->ident;
5429
5430 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5431 l2cap_state_change(chan, BT_CONNECT2);
5432 /* The following result value is actually not defined
5433 * for LE CoC but we use it to let the function know
5434 * that it should bail out after doing its cleanup
5435 * instead of sending a response.
5436 */
5437 result = L2CAP_CR_PEND;
5438 chan->ops->defer(chan);
5439 } else {
5440 l2cap_chan_ready(chan);
5441 result = L2CAP_CR_SUCCESS;
5442 }
5443
5444 response_unlock:
5445 l2cap_chan_unlock(pchan);
5446 mutex_unlock(&conn->chan_lock);
5447 l2cap_chan_put(pchan);
5448
5449 if (result == L2CAP_CR_PEND)
5450 return 0;
5451
5452 response:
5453 if (chan) {
5454 rsp.mtu = cpu_to_le16(chan->imtu);
5455 rsp.mps = cpu_to_le16(chan->mps);
5456 } else {
5457 rsp.mtu = 0;
5458 rsp.mps = 0;
5459 }
5460
5461 rsp.dcid = cpu_to_le16(dcid);
5462 rsp.credits = cpu_to_le16(credits);
5463 rsp.result = cpu_to_le16(result);
5464
5465 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5466
5467 return 0;
5468 }
5469
5470 static inline int l2cap_le_credits(struct l2cap_conn *conn,
5471 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5472 u8 *data)
5473 {
5474 struct l2cap_le_credits *pkt;
5475 struct l2cap_chan *chan;
5476 u16 cid, credits, max_credits;
5477
5478 if (cmd_len != sizeof(*pkt))
5479 return -EPROTO;
5480
5481 pkt = (struct l2cap_le_credits *) data;
5482 cid = __le16_to_cpu(pkt->cid);
5483 credits = __le16_to_cpu(pkt->credits);
5484
5485 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5486
5487 chan = l2cap_get_chan_by_dcid(conn, cid);
5488 if (!chan)
5489 return -EBADSLT;
5490
5491 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5492 if (credits > max_credits) {
5493 BT_ERR("LE credits overflow");
5494 l2cap_send_disconn_req(chan, ECONNRESET);
5495 l2cap_chan_unlock(chan);
5496
5497 /* Return 0 so that we don't trigger an unnecessary
5498 * command reject packet.
5499 */
5500 return 0;
5501 }
5502
5503 chan->tx_credits += credits;
5504
5505 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5506 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5507 chan->tx_credits--;
5508 }
5509
5510 if (chan->tx_credits)
5511 chan->ops->resume(chan);
5512
5513 l2cap_chan_unlock(chan);
5514
5515 return 0;
5516 }
5517
5518 static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5519 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5520 u8 *data)
5521 {
5522 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5523 struct l2cap_chan *chan;
5524
5525 if (cmd_len < sizeof(*rej))
5526 return -EPROTO;
5527
5528 mutex_lock(&conn->chan_lock);
5529
5530 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5531 if (!chan)
5532 goto done;
5533
5534 l2cap_chan_lock(chan);
5535 l2cap_chan_del(chan, ECONNREFUSED);
5536 l2cap_chan_unlock(chan);
5537
5538 done:
5539 mutex_unlock(&conn->chan_lock);
5540 return 0;
5541 }
5542
5543 static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
5544 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5545 u8 *data)
5546 {
5547 int err = 0;
5548
5549 switch (cmd->code) {
5550 case L2CAP_COMMAND_REJ:
5551 l2cap_le_command_rej(conn, cmd, cmd_len, data);
5552 break;
5553
5554 case L2CAP_CONN_PARAM_UPDATE_REQ:
5555 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5556 break;
5557
5558 case L2CAP_CONN_PARAM_UPDATE_RSP:
5559 break;
5560
5561 case L2CAP_LE_CONN_RSP:
5562 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
5563 break;
5564
5565 case L2CAP_LE_CONN_REQ:
5566 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5567 break;
5568
5569 case L2CAP_LE_CREDITS:
5570 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5571 break;
5572
5573 case L2CAP_DISCONN_REQ:
5574 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5575 break;
5576
5577 case L2CAP_DISCONN_RSP:
5578 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5579 break;
5580
5581 default:
5582 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5583 err = -EINVAL;
5584 break;
5585 }
5586
5587 return err;
5588 }
5589
5590 static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5591 struct sk_buff *skb)
5592 {
5593 struct hci_conn *hcon = conn->hcon;
5594 struct l2cap_cmd_hdr *cmd;
5595 u16 len;
5596 int err;
5597
5598 if (hcon->type != LE_LINK)
5599 goto drop;
5600
5601 if (skb->len < L2CAP_CMD_HDR_SIZE)
5602 goto drop;
5603
5604 cmd = (void *) skb->data;
5605 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
5606
5607 len = le16_to_cpu(cmd->len);
5608
5609 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
5610
5611 if (len != skb->len || !cmd->ident) {
5612 BT_DBG("corrupted command");
5613 goto drop;
5614 }
5615
5616 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
5617 if (err) {
5618 struct l2cap_cmd_rej_unk rej;
5619
5620 BT_ERR("Wrong link type (%d)", err);
5621
5622 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5623 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5624 sizeof(rej), &rej);
5625 }
5626
5627 drop:
5628 kfree_skb(skb);
5629 }
5630
5631 static inline void l2cap_sig_channel(struct l2cap_conn *conn,
5632 struct sk_buff *skb)
5633 {
5634 struct hci_conn *hcon = conn->hcon;
5635 u8 *data = skb->data;
5636 int len = skb->len;
5637 struct l2cap_cmd_hdr cmd;
5638 int err;
5639
5640 l2cap_raw_recv(conn, skb);
5641
5642 if (hcon->type != ACL_LINK)
5643 goto drop;
5644
5645 while (len >= L2CAP_CMD_HDR_SIZE) {
5646 u16 cmd_len;
5647 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5648 data += L2CAP_CMD_HDR_SIZE;
5649 len -= L2CAP_CMD_HDR_SIZE;
5650
5651 cmd_len = le16_to_cpu(cmd.len);
5652
5653 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5654 cmd.ident);
5655
5656 if (cmd_len > len || !cmd.ident) {
5657 BT_DBG("corrupted command");
5658 break;
5659 }
5660
5661 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
5662 if (err) {
5663 struct l2cap_cmd_rej_unk rej;
5664
5665 BT_ERR("Wrong link type (%d)", err);
5666
5667 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5668 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5669 sizeof(rej), &rej);
5670 }
5671
5672 data += cmd_len;
5673 len -= cmd_len;
5674 }
5675
5676 drop:
5677 kfree_skb(skb);
5678 }
5679
5680 static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
5681 {
5682 u16 our_fcs, rcv_fcs;
5683 int hdr_size;
5684
5685 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5686 hdr_size = L2CAP_EXT_HDR_SIZE;
5687 else
5688 hdr_size = L2CAP_ENH_HDR_SIZE;
5689
5690 if (chan->fcs == L2CAP_FCS_CRC16) {
5691 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
5692 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5693 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5694
5695 if (our_fcs != rcv_fcs)
5696 return -EBADMSG;
5697 }
5698 return 0;
5699 }
5700
5701 static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
5702 {
5703 struct l2cap_ctrl control;
5704
5705 BT_DBG("chan %p", chan);
5706
5707 memset(&control, 0, sizeof(control));
5708 control.sframe = 1;
5709 control.final = 1;
5710 control.reqseq = chan->buffer_seq;
5711 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5712
5713 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5714 control.super = L2CAP_SUPER_RNR;
5715 l2cap_send_sframe(chan, &control);
5716 }
5717
5718 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5719 chan->unacked_frames > 0)
5720 __set_retrans_timer(chan);
5721
5722 /* Send pending iframes */
5723 l2cap_ertm_send(chan);
5724
5725 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
5726 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5727 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5728 * send it now.
5729 */
5730 control.super = L2CAP_SUPER_RR;
5731 l2cap_send_sframe(chan, &control);
5732 }
5733 }
5734
5735 static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5736 struct sk_buff **last_frag)
5737 {
5738 /* skb->len reflects data in skb as well as all fragments
5739 * skb->data_len reflects only data in fragments
5740 */
5741 if (!skb_has_frag_list(skb))
5742 skb_shinfo(skb)->frag_list = new_frag;
5743
5744 new_frag->next = NULL;
5745
5746 (*last_frag)->next = new_frag;
5747 *last_frag = new_frag;
5748
5749 skb->len += new_frag->len;
5750 skb->data_len += new_frag->len;
5751 skb->truesize += new_frag->truesize;
5752 }
5753
5754 static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5755 struct l2cap_ctrl *control)
5756 {
5757 int err = -EINVAL;
5758
5759 switch (control->sar) {
5760 case L2CAP_SAR_UNSEGMENTED:
5761 if (chan->sdu)
5762 break;
5763
5764 err = chan->ops->recv(chan, skb);
5765 break;
5766
5767 case L2CAP_SAR_START:
5768 if (chan->sdu)
5769 break;
5770
5771 chan->sdu_len = get_unaligned_le16(skb->data);
5772 skb_pull(skb, L2CAP_SDULEN_SIZE);
5773
5774 if (chan->sdu_len > chan->imtu) {
5775 err = -EMSGSIZE;
5776 break;
5777 }
5778
5779 if (skb->len >= chan->sdu_len)
5780 break;
5781
5782 chan->sdu = skb;
5783 chan->sdu_last_frag = skb;
5784
5785 skb = NULL;
5786 err = 0;
5787 break;
5788
5789 case L2CAP_SAR_CONTINUE:
5790 if (!chan->sdu)
5791 break;
5792
5793 append_skb_frag(chan->sdu, skb,
5794 &chan->sdu_last_frag);
5795 skb = NULL;
5796
5797 if (chan->sdu->len >= chan->sdu_len)
5798 break;
5799
5800 err = 0;
5801 break;
5802
5803 case L2CAP_SAR_END:
5804 if (!chan->sdu)
5805 break;
5806
5807 append_skb_frag(chan->sdu, skb,
5808 &chan->sdu_last_frag);
5809 skb = NULL;
5810
5811 if (chan->sdu->len != chan->sdu_len)
5812 break;
5813
5814 err = chan->ops->recv(chan, chan->sdu);
5815
5816 if (!err) {
5817 /* Reassembly complete */
5818 chan->sdu = NULL;
5819 chan->sdu_last_frag = NULL;
5820 chan->sdu_len = 0;
5821 }
5822 break;
5823 }
5824
5825 if (err) {
5826 kfree_skb(skb);
5827 kfree_skb(chan->sdu);
5828 chan->sdu = NULL;
5829 chan->sdu_last_frag = NULL;
5830 chan->sdu_len = 0;
5831 }
5832
5833 return err;
5834 }
5835
5836 static int l2cap_resegment(struct l2cap_chan *chan)
5837 {
5838 /* Placeholder */
5839 return 0;
5840 }
5841
5842 void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
5843 {
5844 u8 event;
5845
5846 if (chan->mode != L2CAP_MODE_ERTM)
5847 return;
5848
5849 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
5850 l2cap_tx(chan, NULL, NULL, event);
5851 }
5852
5853 static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5854 {
5855 int err = 0;
5856 /* Pass sequential frames to l2cap_reassemble_sdu()
5857 * until a gap is encountered.
5858 */
5859
5860 BT_DBG("chan %p", chan);
5861
5862 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5863 struct sk_buff *skb;
5864 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5865 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5866
5867 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5868
5869 if (!skb)
5870 break;
5871
5872 skb_unlink(skb, &chan->srej_q);
5873 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5874 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5875 if (err)
5876 break;
5877 }
5878
5879 if (skb_queue_empty(&chan->srej_q)) {
5880 chan->rx_state = L2CAP_RX_STATE_RECV;
5881 l2cap_send_ack(chan);
5882 }
5883
5884 return err;
5885 }
5886
5887 static void l2cap_handle_srej(struct l2cap_chan *chan,
5888 struct l2cap_ctrl *control)
5889 {
5890 struct sk_buff *skb;
5891
5892 BT_DBG("chan %p, control %p", chan, control);
5893
5894 if (control->reqseq == chan->next_tx_seq) {
5895 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5896 l2cap_send_disconn_req(chan, ECONNRESET);
5897 return;
5898 }
5899
5900 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5901
5902 if (skb == NULL) {
5903 BT_DBG("Seq %d not available for retransmission",
5904 control->reqseq);
5905 return;
5906 }
5907
5908 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5909 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5910 l2cap_send_disconn_req(chan, ECONNRESET);
5911 return;
5912 }
5913
5914 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5915
5916 if (control->poll) {
5917 l2cap_pass_to_tx(chan, control);
5918
5919 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5920 l2cap_retransmit(chan, control);
5921 l2cap_ertm_send(chan);
5922
5923 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5924 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5925 chan->srej_save_reqseq = control->reqseq;
5926 }
5927 } else {
5928 l2cap_pass_to_tx_fbit(chan, control);
5929
5930 if (control->final) {
5931 if (chan->srej_save_reqseq != control->reqseq ||
5932 !test_and_clear_bit(CONN_SREJ_ACT,
5933 &chan->conn_state))
5934 l2cap_retransmit(chan, control);
5935 } else {
5936 l2cap_retransmit(chan, control);
5937 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5938 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5939 chan->srej_save_reqseq = control->reqseq;
5940 }
5941 }
5942 }
5943 }
5944
5945 static void l2cap_handle_rej(struct l2cap_chan *chan,
5946 struct l2cap_ctrl *control)
5947 {
5948 struct sk_buff *skb;
5949
5950 BT_DBG("chan %p, control %p", chan, control);
5951
5952 if (control->reqseq == chan->next_tx_seq) {
5953 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5954 l2cap_send_disconn_req(chan, ECONNRESET);
5955 return;
5956 }
5957
5958 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5959
5960 if (chan->max_tx && skb &&
5961 bt_cb(skb)->control.retries >= chan->max_tx) {
5962 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5963 l2cap_send_disconn_req(chan, ECONNRESET);
5964 return;
5965 }
5966
5967 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5968
5969 l2cap_pass_to_tx(chan, control);
5970
5971 if (control->final) {
5972 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5973 l2cap_retransmit_all(chan, control);
5974 } else {
5975 l2cap_retransmit_all(chan, control);
5976 l2cap_ertm_send(chan);
5977 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5978 set_bit(CONN_REJ_ACT, &chan->conn_state);
5979 }
5980 }
5981
5982 static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5983 {
5984 BT_DBG("chan %p, txseq %d", chan, txseq);
5985
5986 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5987 chan->expected_tx_seq);
5988
5989 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5990 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5991 chan->tx_win) {
5992 /* See notes below regarding "double poll" and
5993 * invalid packets.
5994 */
5995 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5996 BT_DBG("Invalid/Ignore - after SREJ");
5997 return L2CAP_TXSEQ_INVALID_IGNORE;
5998 } else {
5999 BT_DBG("Invalid - in window after SREJ sent");
6000 return L2CAP_TXSEQ_INVALID;
6001 }
6002 }
6003
6004 if (chan->srej_list.head == txseq) {
6005 BT_DBG("Expected SREJ");
6006 return L2CAP_TXSEQ_EXPECTED_SREJ;
6007 }
6008
6009 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6010 BT_DBG("Duplicate SREJ - txseq already stored");
6011 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6012 }
6013
6014 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6015 BT_DBG("Unexpected SREJ - not requested");
6016 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6017 }
6018 }
6019
6020 if (chan->expected_tx_seq == txseq) {
6021 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6022 chan->tx_win) {
6023 BT_DBG("Invalid - txseq outside tx window");
6024 return L2CAP_TXSEQ_INVALID;
6025 } else {
6026 BT_DBG("Expected");
6027 return L2CAP_TXSEQ_EXPECTED;
6028 }
6029 }
6030
6031 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
6032 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
6033 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6034 return L2CAP_TXSEQ_DUPLICATE;
6035 }
6036
6037 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6038 /* A source of invalid packets is a "double poll" condition,
6039 * where delays cause us to send multiple poll packets. If
6040 * the remote stack receives and processes both polls,
6041 * sequence numbers can wrap around in such a way that a
6042 * resent frame has a sequence number that looks like new data
6043 * with a sequence gap. This would trigger an erroneous SREJ
6044 * request.
6045 *
6046 * Fortunately, this is impossible with a tx window that's
6047 * less than half of the maximum sequence number, which allows
6048 * invalid frames to be safely ignored.
6049 *
6050 * With tx window sizes greater than half of the tx window
6051 * maximum, the frame is invalid and cannot be ignored. This
6052 * causes a disconnect.
6053 */
6054
6055 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6056 BT_DBG("Invalid/Ignore - txseq outside tx window");
6057 return L2CAP_TXSEQ_INVALID_IGNORE;
6058 } else {
6059 BT_DBG("Invalid - txseq outside tx window");
6060 return L2CAP_TXSEQ_INVALID;
6061 }
6062 } else {
6063 BT_DBG("Unexpected - txseq indicates missing frames");
6064 return L2CAP_TXSEQ_UNEXPECTED;
6065 }
6066 }
6067
6068 static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6069 struct l2cap_ctrl *control,
6070 struct sk_buff *skb, u8 event)
6071 {
6072 int err = 0;
6073 bool skb_in_use = false;
6074
6075 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6076 event);
6077
6078 switch (event) {
6079 case L2CAP_EV_RECV_IFRAME:
6080 switch (l2cap_classify_txseq(chan, control->txseq)) {
6081 case L2CAP_TXSEQ_EXPECTED:
6082 l2cap_pass_to_tx(chan, control);
6083
6084 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6085 BT_DBG("Busy, discarding expected seq %d",
6086 control->txseq);
6087 break;
6088 }
6089
6090 chan->expected_tx_seq = __next_seq(chan,
6091 control->txseq);
6092
6093 chan->buffer_seq = chan->expected_tx_seq;
6094 skb_in_use = true;
6095
6096 err = l2cap_reassemble_sdu(chan, skb, control);
6097 if (err)
6098 break;
6099
6100 if (control->final) {
6101 if (!test_and_clear_bit(CONN_REJ_ACT,
6102 &chan->conn_state)) {
6103 control->final = 0;
6104 l2cap_retransmit_all(chan, control);
6105 l2cap_ertm_send(chan);
6106 }
6107 }
6108
6109 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6110 l2cap_send_ack(chan);
6111 break;
6112 case L2CAP_TXSEQ_UNEXPECTED:
6113 l2cap_pass_to_tx(chan, control);
6114
6115 /* Can't issue SREJ frames in the local busy state.
6116 * Drop this frame, it will be seen as missing
6117 * when local busy is exited.
6118 */
6119 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6120 BT_DBG("Busy, discarding unexpected seq %d",
6121 control->txseq);
6122 break;
6123 }
6124
6125 /* There was a gap in the sequence, so an SREJ
6126 * must be sent for each missing frame. The
6127 * current frame is stored for later use.
6128 */
6129 skb_queue_tail(&chan->srej_q, skb);
6130 skb_in_use = true;
6131 BT_DBG("Queued %p (queue len %d)", skb,
6132 skb_queue_len(&chan->srej_q));
6133
6134 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6135 l2cap_seq_list_clear(&chan->srej_list);
6136 l2cap_send_srej(chan, control->txseq);
6137
6138 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6139 break;
6140 case L2CAP_TXSEQ_DUPLICATE:
6141 l2cap_pass_to_tx(chan, control);
6142 break;
6143 case L2CAP_TXSEQ_INVALID_IGNORE:
6144 break;
6145 case L2CAP_TXSEQ_INVALID:
6146 default:
6147 l2cap_send_disconn_req(chan, ECONNRESET);
6148 break;
6149 }
6150 break;
6151 case L2CAP_EV_RECV_RR:
6152 l2cap_pass_to_tx(chan, control);
6153 if (control->final) {
6154 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6155
6156 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6157 !__chan_is_moving(chan)) {
6158 control->final = 0;
6159 l2cap_retransmit_all(chan, control);
6160 }
6161
6162 l2cap_ertm_send(chan);
6163 } else if (control->poll) {
6164 l2cap_send_i_or_rr_or_rnr(chan);
6165 } else {
6166 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6167 &chan->conn_state) &&
6168 chan->unacked_frames)
6169 __set_retrans_timer(chan);
6170
6171 l2cap_ertm_send(chan);
6172 }
6173 break;
6174 case L2CAP_EV_RECV_RNR:
6175 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6176 l2cap_pass_to_tx(chan, control);
6177 if (control && control->poll) {
6178 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6179 l2cap_send_rr_or_rnr(chan, 0);
6180 }
6181 __clear_retrans_timer(chan);
6182 l2cap_seq_list_clear(&chan->retrans_list);
6183 break;
6184 case L2CAP_EV_RECV_REJ:
6185 l2cap_handle_rej(chan, control);
6186 break;
6187 case L2CAP_EV_RECV_SREJ:
6188 l2cap_handle_srej(chan, control);
6189 break;
6190 default:
6191 break;
6192 }
6193
6194 if (skb && !skb_in_use) {
6195 BT_DBG("Freeing %p", skb);
6196 kfree_skb(skb);
6197 }
6198
6199 return err;
6200 }
6201
6202 static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6203 struct l2cap_ctrl *control,
6204 struct sk_buff *skb, u8 event)
6205 {
6206 int err = 0;
6207 u16 txseq = control->txseq;
6208 bool skb_in_use = false;
6209
6210 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6211 event);
6212
6213 switch (event) {
6214 case L2CAP_EV_RECV_IFRAME:
6215 switch (l2cap_classify_txseq(chan, txseq)) {
6216 case L2CAP_TXSEQ_EXPECTED:
6217 /* Keep frame for reassembly later */
6218 l2cap_pass_to_tx(chan, control);
6219 skb_queue_tail(&chan->srej_q, skb);
6220 skb_in_use = true;
6221 BT_DBG("Queued %p (queue len %d)", skb,
6222 skb_queue_len(&chan->srej_q));
6223
6224 chan->expected_tx_seq = __next_seq(chan, txseq);
6225 break;
6226 case L2CAP_TXSEQ_EXPECTED_SREJ:
6227 l2cap_seq_list_pop(&chan->srej_list);
6228
6229 l2cap_pass_to_tx(chan, control);
6230 skb_queue_tail(&chan->srej_q, skb);
6231 skb_in_use = true;
6232 BT_DBG("Queued %p (queue len %d)", skb,
6233 skb_queue_len(&chan->srej_q));
6234
6235 err = l2cap_rx_queued_iframes(chan);
6236 if (err)
6237 break;
6238
6239 break;
6240 case L2CAP_TXSEQ_UNEXPECTED:
6241 /* Got a frame that can't be reassembled yet.
6242 * Save it for later, and send SREJs to cover
6243 * the missing frames.
6244 */
6245 skb_queue_tail(&chan->srej_q, skb);
6246 skb_in_use = true;
6247 BT_DBG("Queued %p (queue len %d)", skb,
6248 skb_queue_len(&chan->srej_q));
6249
6250 l2cap_pass_to_tx(chan, control);
6251 l2cap_send_srej(chan, control->txseq);
6252 break;
6253 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6254 /* This frame was requested with an SREJ, but
6255 * some expected retransmitted frames are
6256 * missing. Request retransmission of missing
6257 * SREJ'd frames.
6258 */
6259 skb_queue_tail(&chan->srej_q, skb);
6260 skb_in_use = true;
6261 BT_DBG("Queued %p (queue len %d)", skb,
6262 skb_queue_len(&chan->srej_q));
6263
6264 l2cap_pass_to_tx(chan, control);
6265 l2cap_send_srej_list(chan, control->txseq);
6266 break;
6267 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6268 /* We've already queued this frame. Drop this copy. */
6269 l2cap_pass_to_tx(chan, control);
6270 break;
6271 case L2CAP_TXSEQ_DUPLICATE:
6272 /* Expecting a later sequence number, so this frame
6273 * was already received. Ignore it completely.
6274 */
6275 break;
6276 case L2CAP_TXSEQ_INVALID_IGNORE:
6277 break;
6278 case L2CAP_TXSEQ_INVALID:
6279 default:
6280 l2cap_send_disconn_req(chan, ECONNRESET);
6281 break;
6282 }
6283 break;
6284 case L2CAP_EV_RECV_RR:
6285 l2cap_pass_to_tx(chan, control);
6286 if (control->final) {
6287 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6288
6289 if (!test_and_clear_bit(CONN_REJ_ACT,
6290 &chan->conn_state)) {
6291 control->final = 0;
6292 l2cap_retransmit_all(chan, control);
6293 }
6294
6295 l2cap_ertm_send(chan);
6296 } else if (control->poll) {
6297 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6298 &chan->conn_state) &&
6299 chan->unacked_frames) {
6300 __set_retrans_timer(chan);
6301 }
6302
6303 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6304 l2cap_send_srej_tail(chan);
6305 } else {
6306 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6307 &chan->conn_state) &&
6308 chan->unacked_frames)
6309 __set_retrans_timer(chan);
6310
6311 l2cap_send_ack(chan);
6312 }
6313 break;
6314 case L2CAP_EV_RECV_RNR:
6315 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6316 l2cap_pass_to_tx(chan, control);
6317 if (control->poll) {
6318 l2cap_send_srej_tail(chan);
6319 } else {
6320 struct l2cap_ctrl rr_control;
6321 memset(&rr_control, 0, sizeof(rr_control));
6322 rr_control.sframe = 1;
6323 rr_control.super = L2CAP_SUPER_RR;
6324 rr_control.reqseq = chan->buffer_seq;
6325 l2cap_send_sframe(chan, &rr_control);
6326 }
6327
6328 break;
6329 case L2CAP_EV_RECV_REJ:
6330 l2cap_handle_rej(chan, control);
6331 break;
6332 case L2CAP_EV_RECV_SREJ:
6333 l2cap_handle_srej(chan, control);
6334 break;
6335 }
6336
6337 if (skb && !skb_in_use) {
6338 BT_DBG("Freeing %p", skb);
6339 kfree_skb(skb);
6340 }
6341
6342 return err;
6343 }
6344
6345 static int l2cap_finish_move(struct l2cap_chan *chan)
6346 {
6347 BT_DBG("chan %p", chan);
6348
6349 chan->rx_state = L2CAP_RX_STATE_RECV;
6350
6351 if (chan->hs_hcon)
6352 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6353 else
6354 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6355
6356 return l2cap_resegment(chan);
6357 }
6358
6359 static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6360 struct l2cap_ctrl *control,
6361 struct sk_buff *skb, u8 event)
6362 {
6363 int err;
6364
6365 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6366 event);
6367
6368 if (!control->poll)
6369 return -EPROTO;
6370
6371 l2cap_process_reqseq(chan, control->reqseq);
6372
6373 if (!skb_queue_empty(&chan->tx_q))
6374 chan->tx_send_head = skb_peek(&chan->tx_q);
6375 else
6376 chan->tx_send_head = NULL;
6377
6378 /* Rewind next_tx_seq to the point expected
6379 * by the receiver.
6380 */
6381 chan->next_tx_seq = control->reqseq;
6382 chan->unacked_frames = 0;
6383
6384 err = l2cap_finish_move(chan);
6385 if (err)
6386 return err;
6387
6388 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6389 l2cap_send_i_or_rr_or_rnr(chan);
6390
6391 if (event == L2CAP_EV_RECV_IFRAME)
6392 return -EPROTO;
6393
6394 return l2cap_rx_state_recv(chan, control, NULL, event);
6395 }
6396
6397 static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6398 struct l2cap_ctrl *control,
6399 struct sk_buff *skb, u8 event)
6400 {
6401 int err;
6402
6403 if (!control->final)
6404 return -EPROTO;
6405
6406 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6407
6408 chan->rx_state = L2CAP_RX_STATE_RECV;
6409 l2cap_process_reqseq(chan, control->reqseq);
6410
6411 if (!skb_queue_empty(&chan->tx_q))
6412 chan->tx_send_head = skb_peek(&chan->tx_q);
6413 else
6414 chan->tx_send_head = NULL;
6415
6416 /* Rewind next_tx_seq to the point expected
6417 * by the receiver.
6418 */
6419 chan->next_tx_seq = control->reqseq;
6420 chan->unacked_frames = 0;
6421
6422 if (chan->hs_hcon)
6423 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6424 else
6425 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6426
6427 err = l2cap_resegment(chan);
6428
6429 if (!err)
6430 err = l2cap_rx_state_recv(chan, control, skb, event);
6431
6432 return err;
6433 }
6434
6435 static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6436 {
6437 /* Make sure reqseq is for a packet that has been sent but not acked */
6438 u16 unacked;
6439
6440 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6441 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6442 }
6443
6444 static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6445 struct sk_buff *skb, u8 event)
6446 {
6447 int err = 0;
6448
6449 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6450 control, skb, event, chan->rx_state);
6451
6452 if (__valid_reqseq(chan, control->reqseq)) {
6453 switch (chan->rx_state) {
6454 case L2CAP_RX_STATE_RECV:
6455 err = l2cap_rx_state_recv(chan, control, skb, event);
6456 break;
6457 case L2CAP_RX_STATE_SREJ_SENT:
6458 err = l2cap_rx_state_srej_sent(chan, control, skb,
6459 event);
6460 break;
6461 case L2CAP_RX_STATE_WAIT_P:
6462 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6463 break;
6464 case L2CAP_RX_STATE_WAIT_F:
6465 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6466 break;
6467 default:
6468 /* shut it down */
6469 break;
6470 }
6471 } else {
6472 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6473 control->reqseq, chan->next_tx_seq,
6474 chan->expected_ack_seq);
6475 l2cap_send_disconn_req(chan, ECONNRESET);
6476 }
6477
6478 return err;
6479 }
6480
6481 static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6482 struct sk_buff *skb)
6483 {
6484 int err = 0;
6485
6486 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6487 chan->rx_state);
6488
6489 if (l2cap_classify_txseq(chan, control->txseq) ==
6490 L2CAP_TXSEQ_EXPECTED) {
6491 l2cap_pass_to_tx(chan, control);
6492
6493 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6494 __next_seq(chan, chan->buffer_seq));
6495
6496 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6497
6498 l2cap_reassemble_sdu(chan, skb, control);
6499 } else {
6500 if (chan->sdu) {
6501 kfree_skb(chan->sdu);
6502 chan->sdu = NULL;
6503 }
6504 chan->sdu_last_frag = NULL;
6505 chan->sdu_len = 0;
6506
6507 if (skb) {
6508 BT_DBG("Freeing %p", skb);
6509 kfree_skb(skb);
6510 }
6511 }
6512
6513 chan->last_acked_seq = control->txseq;
6514 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6515
6516 return err;
6517 }
6518
6519 static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6520 {
6521 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6522 u16 len;
6523 u8 event;
6524
6525 __unpack_control(chan, skb);
6526
6527 len = skb->len;
6528
6529 /*
6530 * We can just drop the corrupted I-frame here.
6531 * Receiver will miss it and start proper recovery
6532 * procedures and ask for retransmission.
6533 */
6534 if (l2cap_check_fcs(chan, skb))
6535 goto drop;
6536
6537 if (!control->sframe && control->sar == L2CAP_SAR_START)
6538 len -= L2CAP_SDULEN_SIZE;
6539
6540 if (chan->fcs == L2CAP_FCS_CRC16)
6541 len -= L2CAP_FCS_SIZE;
6542
6543 if (len > chan->mps) {
6544 l2cap_send_disconn_req(chan, ECONNRESET);
6545 goto drop;
6546 }
6547
6548 if (!control->sframe) {
6549 int err;
6550
6551 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6552 control->sar, control->reqseq, control->final,
6553 control->txseq);
6554
6555 /* Validate F-bit - F=0 always valid, F=1 only
6556 * valid in TX WAIT_F
6557 */
6558 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
6559 goto drop;
6560
6561 if (chan->mode != L2CAP_MODE_STREAMING) {
6562 event = L2CAP_EV_RECV_IFRAME;
6563 err = l2cap_rx(chan, control, skb, event);
6564 } else {
6565 err = l2cap_stream_rx(chan, control, skb);
6566 }
6567
6568 if (err)
6569 l2cap_send_disconn_req(chan, ECONNRESET);
6570 } else {
6571 const u8 rx_func_to_event[4] = {
6572 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6573 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6574 };
6575
6576 /* Only I-frames are expected in streaming mode */
6577 if (chan->mode == L2CAP_MODE_STREAMING)
6578 goto drop;
6579
6580 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6581 control->reqseq, control->final, control->poll,
6582 control->super);
6583
6584 if (len != 0) {
6585 BT_ERR("Trailing bytes: %d in sframe", len);
6586 l2cap_send_disconn_req(chan, ECONNRESET);
6587 goto drop;
6588 }
6589
6590 /* Validate F and P bits */
6591 if (control->final && (control->poll ||
6592 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6593 goto drop;
6594
6595 event = rx_func_to_event[control->super];
6596 if (l2cap_rx(chan, control, skb, event))
6597 l2cap_send_disconn_req(chan, ECONNRESET);
6598 }
6599
6600 return 0;
6601
6602 drop:
6603 kfree_skb(skb);
6604 return 0;
6605 }
6606
6607 static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6608 {
6609 struct l2cap_conn *conn = chan->conn;
6610 struct l2cap_le_credits pkt;
6611 u16 return_credits;
6612
6613 /* We return more credits to the sender only after the amount of
6614 * credits falls below half of the initial amount.
6615 */
6616 if (chan->rx_credits >= (le_max_credits + 1) / 2)
6617 return;
6618
6619 return_credits = le_max_credits - chan->rx_credits;
6620
6621 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6622
6623 chan->rx_credits += return_credits;
6624
6625 pkt.cid = cpu_to_le16(chan->scid);
6626 pkt.credits = cpu_to_le16(return_credits);
6627
6628 chan->ident = l2cap_get_ident(conn);
6629
6630 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6631 }
6632
6633 static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6634 {
6635 int err;
6636
6637 if (!chan->rx_credits) {
6638 BT_ERR("No credits to receive LE L2CAP data");
6639 l2cap_send_disconn_req(chan, ECONNRESET);
6640 return -ENOBUFS;
6641 }
6642
6643 if (chan->imtu < skb->len) {
6644 BT_ERR("Too big LE L2CAP PDU");
6645 return -ENOBUFS;
6646 }
6647
6648 chan->rx_credits--;
6649 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6650
6651 l2cap_chan_le_send_credits(chan);
6652
6653 err = 0;
6654
6655 if (!chan->sdu) {
6656 u16 sdu_len;
6657
6658 sdu_len = get_unaligned_le16(skb->data);
6659 skb_pull(skb, L2CAP_SDULEN_SIZE);
6660
6661 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6662 sdu_len, skb->len, chan->imtu);
6663
6664 if (sdu_len > chan->imtu) {
6665 BT_ERR("Too big LE L2CAP SDU length received");
6666 err = -EMSGSIZE;
6667 goto failed;
6668 }
6669
6670 if (skb->len > sdu_len) {
6671 BT_ERR("Too much LE L2CAP data received");
6672 err = -EINVAL;
6673 goto failed;
6674 }
6675
6676 if (skb->len == sdu_len)
6677 return chan->ops->recv(chan, skb);
6678
6679 chan->sdu = skb;
6680 chan->sdu_len = sdu_len;
6681 chan->sdu_last_frag = skb;
6682
6683 return 0;
6684 }
6685
6686 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6687 chan->sdu->len, skb->len, chan->sdu_len);
6688
6689 if (chan->sdu->len + skb->len > chan->sdu_len) {
6690 BT_ERR("Too much LE L2CAP data received");
6691 err = -EINVAL;
6692 goto failed;
6693 }
6694
6695 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6696 skb = NULL;
6697
6698 if (chan->sdu->len == chan->sdu_len) {
6699 err = chan->ops->recv(chan, chan->sdu);
6700 if (!err) {
6701 chan->sdu = NULL;
6702 chan->sdu_last_frag = NULL;
6703 chan->sdu_len = 0;
6704 }
6705 }
6706
6707 failed:
6708 if (err) {
6709 kfree_skb(skb);
6710 kfree_skb(chan->sdu);
6711 chan->sdu = NULL;
6712 chan->sdu_last_frag = NULL;
6713 chan->sdu_len = 0;
6714 }
6715
6716 /* We can't return an error here since we took care of the skb
6717 * freeing internally. An error return would cause the caller to
6718 * do a double-free of the skb.
6719 */
6720 return 0;
6721 }
6722
6723 static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6724 struct sk_buff *skb)
6725 {
6726 struct l2cap_chan *chan;
6727
6728 chan = l2cap_get_chan_by_scid(conn, cid);
6729 if (!chan) {
6730 if (cid == L2CAP_CID_A2MP) {
6731 chan = a2mp_channel_create(conn, skb);
6732 if (!chan) {
6733 kfree_skb(skb);
6734 return;
6735 }
6736
6737 l2cap_chan_lock(chan);
6738 } else {
6739 BT_DBG("unknown cid 0x%4.4x", cid);
6740 /* Drop packet and return */
6741 kfree_skb(skb);
6742 return;
6743 }
6744 }
6745
6746 BT_DBG("chan %p, len %d", chan, skb->len);
6747
6748 if (chan->state != BT_CONNECTED)
6749 goto drop;
6750
6751 switch (chan->mode) {
6752 case L2CAP_MODE_LE_FLOWCTL:
6753 if (l2cap_le_data_rcv(chan, skb) < 0)
6754 goto drop;
6755
6756 goto done;
6757
6758 case L2CAP_MODE_BASIC:
6759 /* If socket recv buffers overflows we drop data here
6760 * which is *bad* because L2CAP has to be reliable.
6761 * But we don't have any other choice. L2CAP doesn't
6762 * provide flow control mechanism. */
6763
6764 if (chan->imtu < skb->len) {
6765 BT_ERR("Dropping L2CAP data: receive buffer overflow");
6766 goto drop;
6767 }
6768
6769 if (!chan->ops->recv(chan, skb))
6770 goto done;
6771 break;
6772
6773 case L2CAP_MODE_ERTM:
6774 case L2CAP_MODE_STREAMING:
6775 l2cap_data_rcv(chan, skb);
6776 goto done;
6777
6778 default:
6779 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
6780 break;
6781 }
6782
6783 drop:
6784 kfree_skb(skb);
6785
6786 done:
6787 l2cap_chan_unlock(chan);
6788 }
6789
6790 static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6791 struct sk_buff *skb)
6792 {
6793 struct hci_conn *hcon = conn->hcon;
6794 struct l2cap_chan *chan;
6795
6796 if (hcon->type != ACL_LINK)
6797 goto free_skb;
6798
6799 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6800 ACL_LINK);
6801 if (!chan)
6802 goto free_skb;
6803
6804 BT_DBG("chan %p, len %d", chan, skb->len);
6805
6806 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
6807 goto drop;
6808
6809 if (chan->imtu < skb->len)
6810 goto drop;
6811
6812 /* Store remote BD_ADDR and PSM for msg_name */
6813 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
6814 bt_cb(skb)->psm = psm;
6815
6816 if (!chan->ops->recv(chan, skb)) {
6817 l2cap_chan_put(chan);
6818 return;
6819 }
6820
6821 drop:
6822 l2cap_chan_put(chan);
6823 free_skb:
6824 kfree_skb(skb);
6825 }
6826
6827 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6828 {
6829 struct l2cap_hdr *lh = (void *) skb->data;
6830 struct hci_conn *hcon = conn->hcon;
6831 u16 cid, len;
6832 __le16 psm;
6833
6834 if (hcon->state != BT_CONNECTED) {
6835 BT_DBG("queueing pending rx skb");
6836 skb_queue_tail(&conn->pending_rx, skb);
6837 return;
6838 }
6839
6840 skb_pull(skb, L2CAP_HDR_SIZE);
6841 cid = __le16_to_cpu(lh->cid);
6842 len = __le16_to_cpu(lh->len);
6843
6844 if (len != skb->len) {
6845 kfree_skb(skb);
6846 return;
6847 }
6848
6849 /* Since we can't actively block incoming LE connections we must
6850 * at least ensure that we ignore incoming data from them.
6851 */
6852 if (hcon->type == LE_LINK &&
6853 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
6854 bdaddr_type(hcon, hcon->dst_type))) {
6855 kfree_skb(skb);
6856 return;
6857 }
6858
6859 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6860
6861 switch (cid) {
6862 case L2CAP_CID_SIGNALING:
6863 l2cap_sig_channel(conn, skb);
6864 break;
6865
6866 case L2CAP_CID_CONN_LESS:
6867 psm = get_unaligned((__le16 *) skb->data);
6868 skb_pull(skb, L2CAP_PSMLEN_SIZE);
6869 l2cap_conless_channel(conn, psm, skb);
6870 break;
6871
6872 case L2CAP_CID_LE_SIGNALING:
6873 l2cap_le_sig_channel(conn, skb);
6874 break;
6875
6876 default:
6877 l2cap_data_channel(conn, cid, skb);
6878 break;
6879 }
6880 }
6881
6882 static void process_pending_rx(struct work_struct *work)
6883 {
6884 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6885 pending_rx_work);
6886 struct sk_buff *skb;
6887
6888 BT_DBG("");
6889
6890 while ((skb = skb_dequeue(&conn->pending_rx)))
6891 l2cap_recv_frame(conn, skb);
6892 }
6893
6894 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6895 {
6896 struct l2cap_conn *conn = hcon->l2cap_data;
6897 struct hci_chan *hchan;
6898
6899 if (conn)
6900 return conn;
6901
6902 hchan = hci_chan_create(hcon);
6903 if (!hchan)
6904 return NULL;
6905
6906 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
6907 if (!conn) {
6908 hci_chan_del(hchan);
6909 return NULL;
6910 }
6911
6912 kref_init(&conn->ref);
6913 hcon->l2cap_data = conn;
6914 conn->hcon = hci_conn_get(hcon);
6915 conn->hchan = hchan;
6916
6917 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6918
6919 switch (hcon->type) {
6920 case LE_LINK:
6921 if (hcon->hdev->le_mtu) {
6922 conn->mtu = hcon->hdev->le_mtu;
6923 break;
6924 }
6925 /* fall through */
6926 default:
6927 conn->mtu = hcon->hdev->acl_mtu;
6928 break;
6929 }
6930
6931 conn->feat_mask = 0;
6932
6933 if (hcon->type == ACL_LINK)
6934 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
6935 &hcon->hdev->dev_flags);
6936
6937 mutex_init(&conn->ident_lock);
6938 mutex_init(&conn->chan_lock);
6939
6940 INIT_LIST_HEAD(&conn->chan_l);
6941 INIT_LIST_HEAD(&conn->users);
6942
6943 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
6944
6945 skb_queue_head_init(&conn->pending_rx);
6946 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
6947 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
6948
6949 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
6950
6951 return conn;
6952 }
6953
6954 static bool is_valid_psm(u16 psm, u8 dst_type) {
6955 if (!psm)
6956 return false;
6957
6958 if (bdaddr_type_is_le(dst_type))
6959 return (psm <= 0x00ff);
6960
6961 /* PSM must be odd and lsb of upper byte must be 0 */
6962 return ((psm & 0x0101) == 0x0001);
6963 }
6964
6965 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
6966 bdaddr_t *dst, u8 dst_type)
6967 {
6968 struct l2cap_conn *conn;
6969 struct hci_conn *hcon;
6970 struct hci_dev *hdev;
6971 int err;
6972
6973 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
6974 dst_type, __le16_to_cpu(psm));
6975
6976 hdev = hci_get_route(dst, &chan->src);
6977 if (!hdev)
6978 return -EHOSTUNREACH;
6979
6980 hci_dev_lock(hdev);
6981
6982 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
6983 chan->chan_type != L2CAP_CHAN_RAW) {
6984 err = -EINVAL;
6985 goto done;
6986 }
6987
6988 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
6989 err = -EINVAL;
6990 goto done;
6991 }
6992
6993 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
6994 err = -EINVAL;
6995 goto done;
6996 }
6997
6998 switch (chan->mode) {
6999 case L2CAP_MODE_BASIC:
7000 break;
7001 case L2CAP_MODE_LE_FLOWCTL:
7002 l2cap_le_flowctl_init(chan);
7003 break;
7004 case L2CAP_MODE_ERTM:
7005 case L2CAP_MODE_STREAMING:
7006 if (!disable_ertm)
7007 break;
7008 /* fall through */
7009 default:
7010 err = -EOPNOTSUPP;
7011 goto done;
7012 }
7013
7014 switch (chan->state) {
7015 case BT_CONNECT:
7016 case BT_CONNECT2:
7017 case BT_CONFIG:
7018 /* Already connecting */
7019 err = 0;
7020 goto done;
7021
7022 case BT_CONNECTED:
7023 /* Already connected */
7024 err = -EISCONN;
7025 goto done;
7026
7027 case BT_OPEN:
7028 case BT_BOUND:
7029 /* Can connect */
7030 break;
7031
7032 default:
7033 err = -EBADFD;
7034 goto done;
7035 }
7036
7037 /* Set destination address and psm */
7038 bacpy(&chan->dst, dst);
7039 chan->dst_type = dst_type;
7040
7041 chan->psm = psm;
7042 chan->dcid = cid;
7043
7044 if (bdaddr_type_is_le(dst_type)) {
7045 u8 role;
7046
7047 /* Convert from L2CAP channel address type to HCI address type
7048 */
7049 if (dst_type == BDADDR_LE_PUBLIC)
7050 dst_type = ADDR_LE_DEV_PUBLIC;
7051 else
7052 dst_type = ADDR_LE_DEV_RANDOM;
7053
7054 if (test_bit(HCI_ADVERTISING, &hdev->dev_flags))
7055 role = HCI_ROLE_SLAVE;
7056 else
7057 role = HCI_ROLE_MASTER;
7058
7059 hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level,
7060 HCI_LE_CONN_TIMEOUT, role);
7061 } else {
7062 u8 auth_type = l2cap_get_auth_type(chan);
7063 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
7064 }
7065
7066 if (IS_ERR(hcon)) {
7067 err = PTR_ERR(hcon);
7068 goto done;
7069 }
7070
7071 conn = l2cap_conn_add(hcon);
7072 if (!conn) {
7073 hci_conn_drop(hcon);
7074 err = -ENOMEM;
7075 goto done;
7076 }
7077
7078 mutex_lock(&conn->chan_lock);
7079 l2cap_chan_lock(chan);
7080
7081 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7082 hci_conn_drop(hcon);
7083 err = -EBUSY;
7084 goto chan_unlock;
7085 }
7086
7087 /* Update source addr of the socket */
7088 bacpy(&chan->src, &hcon->src);
7089 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7090
7091 __l2cap_chan_add(conn, chan);
7092
7093 /* l2cap_chan_add takes its own ref so we can drop this one */
7094 hci_conn_drop(hcon);
7095
7096 l2cap_state_change(chan, BT_CONNECT);
7097 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7098
7099 /* Release chan->sport so that it can be reused by other
7100 * sockets (as it's only used for listening sockets).
7101 */
7102 write_lock(&chan_list_lock);
7103 chan->sport = 0;
7104 write_unlock(&chan_list_lock);
7105
7106 if (hcon->state == BT_CONNECTED) {
7107 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7108 __clear_chan_timer(chan);
7109 if (l2cap_chan_check_security(chan, true))
7110 l2cap_state_change(chan, BT_CONNECTED);
7111 } else
7112 l2cap_do_start(chan);
7113 }
7114
7115 err = 0;
7116
7117 chan_unlock:
7118 l2cap_chan_unlock(chan);
7119 mutex_unlock(&conn->chan_lock);
7120 done:
7121 hci_dev_unlock(hdev);
7122 hci_dev_put(hdev);
7123 return err;
7124 }
7125 EXPORT_SYMBOL_GPL(l2cap_chan_connect);
7126
7127 /* ---- L2CAP interface with lower layer (HCI) ---- */
7128
7129 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
7130 {
7131 int exact = 0, lm1 = 0, lm2 = 0;
7132 struct l2cap_chan *c;
7133
7134 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
7135
7136 /* Find listening sockets and check their link_mode */
7137 read_lock(&chan_list_lock);
7138 list_for_each_entry(c, &chan_list, global_l) {
7139 if (c->state != BT_LISTEN)
7140 continue;
7141
7142 if (!bacmp(&c->src, &hdev->bdaddr)) {
7143 lm1 |= HCI_LM_ACCEPT;
7144 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
7145 lm1 |= HCI_LM_MASTER;
7146 exact++;
7147 } else if (!bacmp(&c->src, BDADDR_ANY)) {
7148 lm2 |= HCI_LM_ACCEPT;
7149 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
7150 lm2 |= HCI_LM_MASTER;
7151 }
7152 }
7153 read_unlock(&chan_list_lock);
7154
7155 return exact ? lm1 : lm2;
7156 }
7157
7158 /* Find the next fixed channel in BT_LISTEN state, continue iteration
7159 * from an existing channel in the list or from the beginning of the
7160 * global list (by passing NULL as first parameter).
7161 */
7162 static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
7163 bdaddr_t *src, u8 link_type)
7164 {
7165 read_lock(&chan_list_lock);
7166
7167 if (c)
7168 c = list_next_entry(c, global_l);
7169 else
7170 c = list_entry(chan_list.next, typeof(*c), global_l);
7171
7172 list_for_each_entry_from(c, &chan_list, global_l) {
7173 if (c->chan_type != L2CAP_CHAN_FIXED)
7174 continue;
7175 if (c->state != BT_LISTEN)
7176 continue;
7177 if (bacmp(&c->src, src) && bacmp(&c->src, BDADDR_ANY))
7178 continue;
7179 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
7180 continue;
7181 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
7182 continue;
7183
7184 l2cap_chan_hold(c);
7185 read_unlock(&chan_list_lock);
7186 return c;
7187 }
7188
7189 read_unlock(&chan_list_lock);
7190
7191 return NULL;
7192 }
7193
7194 void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
7195 {
7196 struct hci_dev *hdev = hcon->hdev;
7197 struct l2cap_conn *conn;
7198 struct l2cap_chan *pchan;
7199 u8 dst_type;
7200
7201 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
7202
7203 if (status) {
7204 l2cap_conn_del(hcon, bt_to_errno(status));
7205 return;
7206 }
7207
7208 conn = l2cap_conn_add(hcon);
7209 if (!conn)
7210 return;
7211
7212 dst_type = bdaddr_type(hcon, hcon->dst_type);
7213
7214 /* If device is blocked, do not create channels for it */
7215 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7216 return;
7217
7218 /* Find fixed channels and notify them of the new connection. We
7219 * use multiple individual lookups, continuing each time where
7220 * we left off, because the list lock would prevent calling the
7221 * potentially sleeping l2cap_chan_lock() function.
7222 */
7223 pchan = l2cap_global_fixed_chan(NULL, &hdev->bdaddr, hcon->type);
7224 while (pchan) {
7225 struct l2cap_chan *chan, *next;
7226
7227 /* Client fixed channels should override server ones */
7228 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7229 goto next;
7230
7231 l2cap_chan_lock(pchan);
7232 chan = pchan->ops->new_connection(pchan);
7233 if (chan) {
7234 bacpy(&chan->src, &hcon->src);
7235 bacpy(&chan->dst, &hcon->dst);
7236 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7237 chan->dst_type = dst_type;
7238
7239 __l2cap_chan_add(conn, chan);
7240 }
7241
7242 l2cap_chan_unlock(pchan);
7243 next:
7244 next = l2cap_global_fixed_chan(pchan, &hdev->bdaddr,
7245 hcon->type);
7246 l2cap_chan_put(pchan);
7247 pchan = next;
7248 }
7249
7250 l2cap_conn_ready(conn);
7251 }
7252
7253 int l2cap_disconn_ind(struct hci_conn *hcon)
7254 {
7255 struct l2cap_conn *conn = hcon->l2cap_data;
7256
7257 BT_DBG("hcon %p", hcon);
7258
7259 if (!conn)
7260 return HCI_ERROR_REMOTE_USER_TERM;
7261 return conn->disc_reason;
7262 }
7263
7264 void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
7265 {
7266 BT_DBG("hcon %p reason %d", hcon, reason);
7267
7268 l2cap_conn_del(hcon, bt_to_errno(reason));
7269 }
7270
7271 static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
7272 {
7273 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
7274 return;
7275
7276 if (encrypt == 0x00) {
7277 if (chan->sec_level == BT_SECURITY_MEDIUM) {
7278 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7279 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7280 chan->sec_level == BT_SECURITY_FIPS)
7281 l2cap_chan_close(chan, ECONNREFUSED);
7282 } else {
7283 if (chan->sec_level == BT_SECURITY_MEDIUM)
7284 __clear_chan_timer(chan);
7285 }
7286 }
7287
7288 int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
7289 {
7290 struct l2cap_conn *conn = hcon->l2cap_data;
7291 struct l2cap_chan *chan;
7292
7293 if (!conn)
7294 return 0;
7295
7296 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
7297
7298 mutex_lock(&conn->chan_lock);
7299
7300 list_for_each_entry(chan, &conn->chan_l, list) {
7301 l2cap_chan_lock(chan);
7302
7303 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7304 state_to_string(chan->state));
7305
7306 if (chan->scid == L2CAP_CID_A2MP) {
7307 l2cap_chan_unlock(chan);
7308 continue;
7309 }
7310
7311 if (!status && encrypt)
7312 chan->sec_level = hcon->sec_level;
7313
7314 if (!__l2cap_no_conn_pending(chan)) {
7315 l2cap_chan_unlock(chan);
7316 continue;
7317 }
7318
7319 if (!status && (chan->state == BT_CONNECTED ||
7320 chan->state == BT_CONFIG)) {
7321 chan->ops->resume(chan);
7322 l2cap_check_encryption(chan, encrypt);
7323 l2cap_chan_unlock(chan);
7324 continue;
7325 }
7326
7327 if (chan->state == BT_CONNECT) {
7328 if (!status)
7329 l2cap_start_connection(chan);
7330 else
7331 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
7332 } else if (chan->state == BT_CONNECT2) {
7333 struct l2cap_conn_rsp rsp;
7334 __u16 res, stat;
7335
7336 if (!status) {
7337 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
7338 res = L2CAP_CR_PEND;
7339 stat = L2CAP_CS_AUTHOR_PEND;
7340 chan->ops->defer(chan);
7341 } else {
7342 l2cap_state_change(chan, BT_CONFIG);
7343 res = L2CAP_CR_SUCCESS;
7344 stat = L2CAP_CS_NO_INFO;
7345 }
7346 } else {
7347 l2cap_state_change(chan, BT_DISCONN);
7348 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
7349 res = L2CAP_CR_SEC_BLOCK;
7350 stat = L2CAP_CS_NO_INFO;
7351 }
7352
7353 rsp.scid = cpu_to_le16(chan->dcid);
7354 rsp.dcid = cpu_to_le16(chan->scid);
7355 rsp.result = cpu_to_le16(res);
7356 rsp.status = cpu_to_le16(stat);
7357 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
7358 sizeof(rsp), &rsp);
7359
7360 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7361 res == L2CAP_CR_SUCCESS) {
7362 char buf[128];
7363 set_bit(CONF_REQ_SENT, &chan->conf_state);
7364 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7365 L2CAP_CONF_REQ,
7366 l2cap_build_conf_req(chan, buf),
7367 buf);
7368 chan->num_conf_req++;
7369 }
7370 }
7371
7372 l2cap_chan_unlock(chan);
7373 }
7374
7375 mutex_unlock(&conn->chan_lock);
7376
7377 return 0;
7378 }
7379
7380 int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
7381 {
7382 struct l2cap_conn *conn = hcon->l2cap_data;
7383 struct l2cap_hdr *hdr;
7384 int len;
7385
7386 /* For AMP controller do not create l2cap conn */
7387 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7388 goto drop;
7389
7390 if (!conn)
7391 conn = l2cap_conn_add(hcon);
7392
7393 if (!conn)
7394 goto drop;
7395
7396 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7397
7398 switch (flags) {
7399 case ACL_START:
7400 case ACL_START_NO_FLUSH:
7401 case ACL_COMPLETE:
7402 if (conn->rx_len) {
7403 BT_ERR("Unexpected start frame (len %d)", skb->len);
7404 kfree_skb(conn->rx_skb);
7405 conn->rx_skb = NULL;
7406 conn->rx_len = 0;
7407 l2cap_conn_unreliable(conn, ECOMM);
7408 }
7409
7410 /* Start fragment always begin with Basic L2CAP header */
7411 if (skb->len < L2CAP_HDR_SIZE) {
7412 BT_ERR("Frame is too short (len %d)", skb->len);
7413 l2cap_conn_unreliable(conn, ECOMM);
7414 goto drop;
7415 }
7416
7417 hdr = (struct l2cap_hdr *) skb->data;
7418 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7419
7420 if (len == skb->len) {
7421 /* Complete frame received */
7422 l2cap_recv_frame(conn, skb);
7423 return 0;
7424 }
7425
7426 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7427
7428 if (skb->len > len) {
7429 BT_ERR("Frame is too long (len %d, expected len %d)",
7430 skb->len, len);
7431 l2cap_conn_unreliable(conn, ECOMM);
7432 goto drop;
7433 }
7434
7435 /* Allocate skb for the complete frame (with header) */
7436 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
7437 if (!conn->rx_skb)
7438 goto drop;
7439
7440 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
7441 skb->len);
7442 conn->rx_len = len - skb->len;
7443 break;
7444
7445 case ACL_CONT:
7446 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7447
7448 if (!conn->rx_len) {
7449 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7450 l2cap_conn_unreliable(conn, ECOMM);
7451 goto drop;
7452 }
7453
7454 if (skb->len > conn->rx_len) {
7455 BT_ERR("Fragment is too long (len %d, expected %d)",
7456 skb->len, conn->rx_len);
7457 kfree_skb(conn->rx_skb);
7458 conn->rx_skb = NULL;
7459 conn->rx_len = 0;
7460 l2cap_conn_unreliable(conn, ECOMM);
7461 goto drop;
7462 }
7463
7464 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
7465 skb->len);
7466 conn->rx_len -= skb->len;
7467
7468 if (!conn->rx_len) {
7469 /* Complete frame received. l2cap_recv_frame
7470 * takes ownership of the skb so set the global
7471 * rx_skb pointer to NULL first.
7472 */
7473 struct sk_buff *rx_skb = conn->rx_skb;
7474 conn->rx_skb = NULL;
7475 l2cap_recv_frame(conn, rx_skb);
7476 }
7477 break;
7478 }
7479
7480 drop:
7481 kfree_skb(skb);
7482 return 0;
7483 }
7484
7485 static int l2cap_debugfs_show(struct seq_file *f, void *p)
7486 {
7487 struct l2cap_chan *c;
7488
7489 read_lock(&chan_list_lock);
7490
7491 list_for_each_entry(c, &chan_list, global_l) {
7492 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7493 &c->src, &c->dst,
7494 c->state, __le16_to_cpu(c->psm),
7495 c->scid, c->dcid, c->imtu, c->omtu,
7496 c->sec_level, c->mode);
7497 }
7498
7499 read_unlock(&chan_list_lock);
7500
7501 return 0;
7502 }
7503
7504 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7505 {
7506 return single_open(file, l2cap_debugfs_show, inode->i_private);
7507 }
7508
7509 static const struct file_operations l2cap_debugfs_fops = {
7510 .open = l2cap_debugfs_open,
7511 .read = seq_read,
7512 .llseek = seq_lseek,
7513 .release = single_release,
7514 };
7515
7516 static struct dentry *l2cap_debugfs;
7517
7518 int __init l2cap_init(void)
7519 {
7520 int err;
7521
7522 err = l2cap_init_sockets();
7523 if (err < 0)
7524 return err;
7525
7526 if (IS_ERR_OR_NULL(bt_debugfs))
7527 return 0;
7528
7529 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7530 NULL, &l2cap_debugfs_fops);
7531
7532 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
7533 &le_max_credits);
7534 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
7535 &le_default_mps);
7536
7537 return 0;
7538 }
7539
7540 void l2cap_exit(void)
7541 {
7542 debugfs_remove(l2cap_debugfs);
7543 l2cap_cleanup_sockets();
7544 }
7545
7546 module_param(disable_ertm, bool, 0644);
7547 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linux kernel - Deliverables
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