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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->dst, hcon->type,
3877 hcon->dst_type, 0, NULL, 0,
3878 hcon->dev_class);
3879 hci_dev_unlock(hdev);
3880
3881 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
3882 return 0;
3883 }
3884
3885 static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
3886 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3887 u8 *data)
3888 {
3889 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3890 u16 scid, dcid, result, status;
3891 struct l2cap_chan *chan;
3892 u8 req[128];
3893 int err;
3894
3895 if (cmd_len < sizeof(*rsp))
3896 return -EPROTO;
3897
3898 scid = __le16_to_cpu(rsp->scid);
3899 dcid = __le16_to_cpu(rsp->dcid);
3900 result = __le16_to_cpu(rsp->result);
3901 status = __le16_to_cpu(rsp->status);
3902
3903 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3904 dcid, scid, result, status);
3905
3906 mutex_lock(&conn->chan_lock);
3907
3908 if (scid) {
3909 chan = __l2cap_get_chan_by_scid(conn, scid);
3910 if (!chan) {
3911 err = -EBADSLT;
3912 goto unlock;
3913 }
3914 } else {
3915 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3916 if (!chan) {
3917 err = -EBADSLT;
3918 goto unlock;
3919 }
3920 }
3921
3922 err = 0;
3923
3924 l2cap_chan_lock(chan);
3925
3926 switch (result) {
3927 case L2CAP_CR_SUCCESS:
3928 l2cap_state_change(chan, BT_CONFIG);
3929 chan->ident = 0;
3930 chan->dcid = dcid;
3931 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
3932
3933 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3934 break;
3935
3936 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3937 l2cap_build_conf_req(chan, req), req);
3938 chan->num_conf_req++;
3939 break;
3940
3941 case L2CAP_CR_PEND:
3942 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
3943 break;
3944
3945 default:
3946 l2cap_chan_del(chan, ECONNREFUSED);
3947 break;
3948 }
3949
3950 l2cap_chan_unlock(chan);
3951
3952 unlock:
3953 mutex_unlock(&conn->chan_lock);
3954
3955 return err;
3956 }
3957
3958 static inline void set_default_fcs(struct l2cap_chan *chan)
3959 {
3960 /* FCS is enabled only in ERTM or streaming mode, if one or both
3961 * sides request it.
3962 */
3963 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
3964 chan->fcs = L2CAP_FCS_NONE;
3965 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
3966 chan->fcs = L2CAP_FCS_CRC16;
3967 }
3968
3969 static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3970 u8 ident, u16 flags)
3971 {
3972 struct l2cap_conn *conn = chan->conn;
3973
3974 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3975 flags);
3976
3977 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3978 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3979
3980 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3981 l2cap_build_conf_rsp(chan, data,
3982 L2CAP_CONF_SUCCESS, flags), data);
3983 }
3984
3985 static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
3986 u16 scid, u16 dcid)
3987 {
3988 struct l2cap_cmd_rej_cid rej;
3989
3990 rej.reason = cpu_to_le16(L2CAP_REJ_INVALID_CID);
3991 rej.scid = __cpu_to_le16(scid);
3992 rej.dcid = __cpu_to_le16(dcid);
3993
3994 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3995 }
3996
3997 static inline int l2cap_config_req(struct l2cap_conn *conn,
3998 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3999 u8 *data)
4000 {
4001 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
4002 u16 dcid, flags;
4003 u8 rsp[64];
4004 struct l2cap_chan *chan;
4005 int len, err = 0;
4006
4007 if (cmd_len < sizeof(*req))
4008 return -EPROTO;
4009
4010 dcid = __le16_to_cpu(req->dcid);
4011 flags = __le16_to_cpu(req->flags);
4012
4013 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
4014
4015 chan = l2cap_get_chan_by_scid(conn, dcid);
4016 if (!chan) {
4017 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
4018 return 0;
4019 }
4020
4021 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
4022 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4023 chan->dcid);
4024 goto unlock;
4025 }
4026
4027 /* Reject if config buffer is too small. */
4028 len = cmd_len - sizeof(*req);
4029 if (chan->conf_len + len > sizeof(chan->conf_req)) {
4030 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4031 l2cap_build_conf_rsp(chan, rsp,
4032 L2CAP_CONF_REJECT, flags), rsp);
4033 goto unlock;
4034 }
4035
4036 /* Store config. */
4037 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4038 chan->conf_len += len;
4039
4040 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
4041 /* Incomplete config. Send empty response. */
4042 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4043 l2cap_build_conf_rsp(chan, rsp,
4044 L2CAP_CONF_SUCCESS, flags), rsp);
4045 goto unlock;
4046 }
4047
4048 /* Complete config. */
4049 len = l2cap_parse_conf_req(chan, rsp);
4050 if (len < 0) {
4051 l2cap_send_disconn_req(chan, ECONNRESET);
4052 goto unlock;
4053 }
4054
4055 chan->ident = cmd->ident;
4056 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
4057 chan->num_conf_rsp++;
4058
4059 /* Reset config buffer. */
4060 chan->conf_len = 0;
4061
4062 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
4063 goto unlock;
4064
4065 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4066 set_default_fcs(chan);
4067
4068 if (chan->mode == L2CAP_MODE_ERTM ||
4069 chan->mode == L2CAP_MODE_STREAMING)
4070 err = l2cap_ertm_init(chan);
4071
4072 if (err < 0)
4073 l2cap_send_disconn_req(chan, -err);
4074 else
4075 l2cap_chan_ready(chan);
4076
4077 goto unlock;
4078 }
4079
4080 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
4081 u8 buf[64];
4082 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
4083 l2cap_build_conf_req(chan, buf), buf);
4084 chan->num_conf_req++;
4085 }
4086
4087 /* Got Conf Rsp PENDING from remote side and asume we sent
4088 Conf Rsp PENDING in the code above */
4089 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
4090 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4091
4092 /* check compatibility */
4093
4094 /* Send rsp for BR/EDR channel */
4095 if (!chan->hs_hcon)
4096 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4097 else
4098 chan->ident = cmd->ident;
4099 }
4100
4101 unlock:
4102 l2cap_chan_unlock(chan);
4103 return err;
4104 }
4105
4106 static inline int l2cap_config_rsp(struct l2cap_conn *conn,
4107 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4108 u8 *data)
4109 {
4110 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4111 u16 scid, flags, result;
4112 struct l2cap_chan *chan;
4113 int len = cmd_len - sizeof(*rsp);
4114 int err = 0;
4115
4116 if (cmd_len < sizeof(*rsp))
4117 return -EPROTO;
4118
4119 scid = __le16_to_cpu(rsp->scid);
4120 flags = __le16_to_cpu(rsp->flags);
4121 result = __le16_to_cpu(rsp->result);
4122
4123 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4124 result, len);
4125
4126 chan = l2cap_get_chan_by_scid(conn, scid);
4127 if (!chan)
4128 return 0;
4129
4130 switch (result) {
4131 case L2CAP_CONF_SUCCESS:
4132 l2cap_conf_rfc_get(chan, rsp->data, len);
4133 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4134 break;
4135
4136 case L2CAP_CONF_PENDING:
4137 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4138
4139 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4140 char buf[64];
4141
4142 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4143 buf, &result);
4144 if (len < 0) {
4145 l2cap_send_disconn_req(chan, ECONNRESET);
4146 goto done;
4147 }
4148
4149 if (!chan->hs_hcon) {
4150 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4151 0);
4152 } else {
4153 if (l2cap_check_efs(chan)) {
4154 amp_create_logical_link(chan);
4155 chan->ident = cmd->ident;
4156 }
4157 }
4158 }
4159 goto done;
4160
4161 case L2CAP_CONF_UNACCEPT:
4162 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
4163 char req[64];
4164
4165 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
4166 l2cap_send_disconn_req(chan, ECONNRESET);
4167 goto done;
4168 }
4169
4170 /* throw out any old stored conf requests */
4171 result = L2CAP_CONF_SUCCESS;
4172 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4173 req, &result);
4174 if (len < 0) {
4175 l2cap_send_disconn_req(chan, ECONNRESET);
4176 goto done;
4177 }
4178
4179 l2cap_send_cmd(conn, l2cap_get_ident(conn),
4180 L2CAP_CONF_REQ, len, req);
4181 chan->num_conf_req++;
4182 if (result != L2CAP_CONF_SUCCESS)
4183 goto done;
4184 break;
4185 }
4186
4187 default:
4188 l2cap_chan_set_err(chan, ECONNRESET);
4189
4190 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
4191 l2cap_send_disconn_req(chan, ECONNRESET);
4192 goto done;
4193 }
4194
4195 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
4196 goto done;
4197
4198 set_bit(CONF_INPUT_DONE, &chan->conf_state);
4199
4200 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
4201 set_default_fcs(chan);
4202
4203 if (chan->mode == L2CAP_MODE_ERTM ||
4204 chan->mode == L2CAP_MODE_STREAMING)
4205 err = l2cap_ertm_init(chan);
4206
4207 if (err < 0)
4208 l2cap_send_disconn_req(chan, -err);
4209 else
4210 l2cap_chan_ready(chan);
4211 }
4212
4213 done:
4214 l2cap_chan_unlock(chan);
4215 return err;
4216 }
4217
4218 static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4219 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4220 u8 *data)
4221 {
4222 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4223 struct l2cap_disconn_rsp rsp;
4224 u16 dcid, scid;
4225 struct l2cap_chan *chan;
4226
4227 if (cmd_len != sizeof(*req))
4228 return -EPROTO;
4229
4230 scid = __le16_to_cpu(req->scid);
4231 dcid = __le16_to_cpu(req->dcid);
4232
4233 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4234
4235 mutex_lock(&conn->chan_lock);
4236
4237 chan = __l2cap_get_chan_by_scid(conn, dcid);
4238 if (!chan) {
4239 mutex_unlock(&conn->chan_lock);
4240 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4241 return 0;
4242 }
4243
4244 l2cap_chan_lock(chan);
4245
4246 rsp.dcid = cpu_to_le16(chan->scid);
4247 rsp.scid = cpu_to_le16(chan->dcid);
4248 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4249
4250 chan->ops->set_shutdown(chan);
4251
4252 l2cap_chan_hold(chan);
4253 l2cap_chan_del(chan, ECONNRESET);
4254
4255 l2cap_chan_unlock(chan);
4256
4257 chan->ops->close(chan);
4258 l2cap_chan_put(chan);
4259
4260 mutex_unlock(&conn->chan_lock);
4261
4262 return 0;
4263 }
4264
4265 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4266 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4267 u8 *data)
4268 {
4269 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4270 u16 dcid, scid;
4271 struct l2cap_chan *chan;
4272
4273 if (cmd_len != sizeof(*rsp))
4274 return -EPROTO;
4275
4276 scid = __le16_to_cpu(rsp->scid);
4277 dcid = __le16_to_cpu(rsp->dcid);
4278
4279 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4280
4281 mutex_lock(&conn->chan_lock);
4282
4283 chan = __l2cap_get_chan_by_scid(conn, scid);
4284 if (!chan) {
4285 mutex_unlock(&conn->chan_lock);
4286 return 0;
4287 }
4288
4289 l2cap_chan_lock(chan);
4290
4291 l2cap_chan_hold(chan);
4292 l2cap_chan_del(chan, 0);
4293
4294 l2cap_chan_unlock(chan);
4295
4296 chan->ops->close(chan);
4297 l2cap_chan_put(chan);
4298
4299 mutex_unlock(&conn->chan_lock);
4300
4301 return 0;
4302 }
4303
4304 static inline int l2cap_information_req(struct l2cap_conn *conn,
4305 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4306 u8 *data)
4307 {
4308 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
4309 u16 type;
4310
4311 if (cmd_len != sizeof(*req))
4312 return -EPROTO;
4313
4314 type = __le16_to_cpu(req->type);
4315
4316 BT_DBG("type 0x%4.4x", type);
4317
4318 if (type == L2CAP_IT_FEAT_MASK) {
4319 u8 buf[8];
4320 u32 feat_mask = l2cap_feat_mask;
4321 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4322 rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK);
4323 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
4324 if (!disable_ertm)
4325 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
4326 | L2CAP_FEAT_FCS;
4327 if (conn->hs_enabled)
4328 feat_mask |= L2CAP_FEAT_EXT_FLOW
4329 | L2CAP_FEAT_EXT_WINDOW;
4330
4331 put_unaligned_le32(feat_mask, rsp->data);
4332 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4333 buf);
4334 } else if (type == L2CAP_IT_FIXED_CHAN) {
4335 u8 buf[12];
4336 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4337
4338 if (conn->hs_enabled)
4339 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4340 else
4341 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4342
4343 rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4344 rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
4345 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
4346 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4347 buf);
4348 } else {
4349 struct l2cap_info_rsp rsp;
4350 rsp.type = cpu_to_le16(type);
4351 rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
4352 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4353 &rsp);
4354 }
4355
4356 return 0;
4357 }
4358
4359 static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4360 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4361 u8 *data)
4362 {
4363 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4364 u16 type, result;
4365
4366 if (cmd_len < sizeof(*rsp))
4367 return -EPROTO;
4368
4369 type = __le16_to_cpu(rsp->type);
4370 result = __le16_to_cpu(rsp->result);
4371
4372 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4373
4374 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4375 if (cmd->ident != conn->info_ident ||
4376 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
4377 return 0;
4378
4379 cancel_delayed_work(&conn->info_timer);
4380
4381 if (result != L2CAP_IR_SUCCESS) {
4382 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4383 conn->info_ident = 0;
4384
4385 l2cap_conn_start(conn);
4386
4387 return 0;
4388 }
4389
4390 switch (type) {
4391 case L2CAP_IT_FEAT_MASK:
4392 conn->feat_mask = get_unaligned_le32(rsp->data);
4393
4394 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
4395 struct l2cap_info_req req;
4396 req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4397
4398 conn->info_ident = l2cap_get_ident(conn);
4399
4400 l2cap_send_cmd(conn, conn->info_ident,
4401 L2CAP_INFO_REQ, sizeof(req), &req);
4402 } else {
4403 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4404 conn->info_ident = 0;
4405
4406 l2cap_conn_start(conn);
4407 }
4408 break;
4409
4410 case L2CAP_IT_FIXED_CHAN:
4411 conn->fixed_chan_mask = rsp->data[0];
4412 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4413 conn->info_ident = 0;
4414
4415 l2cap_conn_start(conn);
4416 break;
4417 }
4418
4419 return 0;
4420 }
4421
4422 static int l2cap_create_channel_req(struct l2cap_conn *conn,
4423 struct l2cap_cmd_hdr *cmd,
4424 u16 cmd_len, void *data)
4425 {
4426 struct l2cap_create_chan_req *req = data;
4427 struct l2cap_create_chan_rsp rsp;
4428 struct l2cap_chan *chan;
4429 struct hci_dev *hdev;
4430 u16 psm, scid;
4431
4432 if (cmd_len != sizeof(*req))
4433 return -EPROTO;
4434
4435 if (!conn->hs_enabled)
4436 return -EINVAL;
4437
4438 psm = le16_to_cpu(req->psm);
4439 scid = le16_to_cpu(req->scid);
4440
4441 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
4442
4443 /* For controller id 0 make BR/EDR connection */
4444 if (req->amp_id == AMP_ID_BREDR) {
4445 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4446 req->amp_id);
4447 return 0;
4448 }
4449
4450 /* Validate AMP controller id */
4451 hdev = hci_dev_get(req->amp_id);
4452 if (!hdev)
4453 goto error;
4454
4455 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4456 hci_dev_put(hdev);
4457 goto error;
4458 }
4459
4460 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4461 req->amp_id);
4462 if (chan) {
4463 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4464 struct hci_conn *hs_hcon;
4465
4466 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4467 &conn->hcon->dst);
4468 if (!hs_hcon) {
4469 hci_dev_put(hdev);
4470 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4471 chan->dcid);
4472 return 0;
4473 }
4474
4475 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4476
4477 mgr->bredr_chan = chan;
4478 chan->hs_hcon = hs_hcon;
4479 chan->fcs = L2CAP_FCS_NONE;
4480 conn->mtu = hdev->block_mtu;
4481 }
4482
4483 hci_dev_put(hdev);
4484
4485 return 0;
4486
4487 error:
4488 rsp.dcid = 0;
4489 rsp.scid = cpu_to_le16(scid);
4490 rsp.result = cpu_to_le16(L2CAP_CR_BAD_AMP);
4491 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4492
4493 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4494 sizeof(rsp), &rsp);
4495
4496 return 0;
4497 }
4498
4499 static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4500 {
4501 struct l2cap_move_chan_req req;
4502 u8 ident;
4503
4504 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4505
4506 ident = l2cap_get_ident(chan->conn);
4507 chan->ident = ident;
4508
4509 req.icid = cpu_to_le16(chan->scid);
4510 req.dest_amp_id = dest_amp_id;
4511
4512 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4513 &req);
4514
4515 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4516 }
4517
4518 static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
4519 {
4520 struct l2cap_move_chan_rsp rsp;
4521
4522 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4523
4524 rsp.icid = cpu_to_le16(chan->dcid);
4525 rsp.result = cpu_to_le16(result);
4526
4527 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4528 sizeof(rsp), &rsp);
4529 }
4530
4531 static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
4532 {
4533 struct l2cap_move_chan_cfm cfm;
4534
4535 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4536
4537 chan->ident = l2cap_get_ident(chan->conn);
4538
4539 cfm.icid = cpu_to_le16(chan->scid);
4540 cfm.result = cpu_to_le16(result);
4541
4542 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4543 sizeof(cfm), &cfm);
4544
4545 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4546 }
4547
4548 static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4549 {
4550 struct l2cap_move_chan_cfm cfm;
4551
4552 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4553
4554 cfm.icid = cpu_to_le16(icid);
4555 cfm.result = cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4556
4557 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4558 sizeof(cfm), &cfm);
4559 }
4560
4561 static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
4562 u16 icid)
4563 {
4564 struct l2cap_move_chan_cfm_rsp rsp;
4565
4566 BT_DBG("icid 0x%4.4x", icid);
4567
4568 rsp.icid = cpu_to_le16(icid);
4569 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4570 }
4571
4572 static void __release_logical_link(struct l2cap_chan *chan)
4573 {
4574 chan->hs_hchan = NULL;
4575 chan->hs_hcon = NULL;
4576
4577 /* Placeholder - release the logical link */
4578 }
4579
4580 static void l2cap_logical_fail(struct l2cap_chan *chan)
4581 {
4582 /* Logical link setup failed */
4583 if (chan->state != BT_CONNECTED) {
4584 /* Create channel failure, disconnect */
4585 l2cap_send_disconn_req(chan, ECONNRESET);
4586 return;
4587 }
4588
4589 switch (chan->move_role) {
4590 case L2CAP_MOVE_ROLE_RESPONDER:
4591 l2cap_move_done(chan);
4592 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4593 break;
4594 case L2CAP_MOVE_ROLE_INITIATOR:
4595 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4596 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4597 /* Remote has only sent pending or
4598 * success responses, clean up
4599 */
4600 l2cap_move_done(chan);
4601 }
4602
4603 /* Other amp move states imply that the move
4604 * has already aborted
4605 */
4606 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4607 break;
4608 }
4609 }
4610
4611 static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4612 struct hci_chan *hchan)
4613 {
4614 struct l2cap_conf_rsp rsp;
4615
4616 chan->hs_hchan = hchan;
4617 chan->hs_hcon->l2cap_data = chan->conn;
4618
4619 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
4620
4621 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4622 int err;
4623
4624 set_default_fcs(chan);
4625
4626 err = l2cap_ertm_init(chan);
4627 if (err < 0)
4628 l2cap_send_disconn_req(chan, -err);
4629 else
4630 l2cap_chan_ready(chan);
4631 }
4632 }
4633
4634 static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4635 struct hci_chan *hchan)
4636 {
4637 chan->hs_hcon = hchan->conn;
4638 chan->hs_hcon->l2cap_data = chan->conn;
4639
4640 BT_DBG("move_state %d", chan->move_state);
4641
4642 switch (chan->move_state) {
4643 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4644 /* Move confirm will be sent after a success
4645 * response is received
4646 */
4647 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4648 break;
4649 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4650 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4651 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4652 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4653 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4654 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4655 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4656 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4657 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4658 }
4659 break;
4660 default:
4661 /* Move was not in expected state, free the channel */
4662 __release_logical_link(chan);
4663
4664 chan->move_state = L2CAP_MOVE_STABLE;
4665 }
4666 }
4667
4668 /* Call with chan locked */
4669 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4670 u8 status)
4671 {
4672 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4673
4674 if (status) {
4675 l2cap_logical_fail(chan);
4676 __release_logical_link(chan);
4677 return;
4678 }
4679
4680 if (chan->state != BT_CONNECTED) {
4681 /* Ignore logical link if channel is on BR/EDR */
4682 if (chan->local_amp_id != AMP_ID_BREDR)
4683 l2cap_logical_finish_create(chan, hchan);
4684 } else {
4685 l2cap_logical_finish_move(chan, hchan);
4686 }
4687 }
4688
4689 void l2cap_move_start(struct l2cap_chan *chan)
4690 {
4691 BT_DBG("chan %p", chan);
4692
4693 if (chan->local_amp_id == AMP_ID_BREDR) {
4694 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4695 return;
4696 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4697 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4698 /* Placeholder - start physical link setup */
4699 } else {
4700 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4701 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4702 chan->move_id = 0;
4703 l2cap_move_setup(chan);
4704 l2cap_send_move_chan_req(chan, 0);
4705 }
4706 }
4707
4708 static void l2cap_do_create(struct l2cap_chan *chan, int result,
4709 u8 local_amp_id, u8 remote_amp_id)
4710 {
4711 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4712 local_amp_id, remote_amp_id);
4713
4714 chan->fcs = L2CAP_FCS_NONE;
4715
4716 /* Outgoing channel on AMP */
4717 if (chan->state == BT_CONNECT) {
4718 if (result == L2CAP_CR_SUCCESS) {
4719 chan->local_amp_id = local_amp_id;
4720 l2cap_send_create_chan_req(chan, remote_amp_id);
4721 } else {
4722 /* Revert to BR/EDR connect */
4723 l2cap_send_conn_req(chan);
4724 }
4725
4726 return;
4727 }
4728
4729 /* Incoming channel on AMP */
4730 if (__l2cap_no_conn_pending(chan)) {
4731 struct l2cap_conn_rsp rsp;
4732 char buf[128];
4733 rsp.scid = cpu_to_le16(chan->dcid);
4734 rsp.dcid = cpu_to_le16(chan->scid);
4735
4736 if (result == L2CAP_CR_SUCCESS) {
4737 /* Send successful response */
4738 rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS);
4739 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4740 } else {
4741 /* Send negative response */
4742 rsp.result = cpu_to_le16(L2CAP_CR_NO_MEM);
4743 rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO);
4744 }
4745
4746 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4747 sizeof(rsp), &rsp);
4748
4749 if (result == L2CAP_CR_SUCCESS) {
4750 l2cap_state_change(chan, BT_CONFIG);
4751 set_bit(CONF_REQ_SENT, &chan->conf_state);
4752 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4753 L2CAP_CONF_REQ,
4754 l2cap_build_conf_req(chan, buf), buf);
4755 chan->num_conf_req++;
4756 }
4757 }
4758 }
4759
4760 static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4761 u8 remote_amp_id)
4762 {
4763 l2cap_move_setup(chan);
4764 chan->move_id = local_amp_id;
4765 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4766
4767 l2cap_send_move_chan_req(chan, remote_amp_id);
4768 }
4769
4770 static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4771 {
4772 struct hci_chan *hchan = NULL;
4773
4774 /* Placeholder - get hci_chan for logical link */
4775
4776 if (hchan) {
4777 if (hchan->state == BT_CONNECTED) {
4778 /* Logical link is ready to go */
4779 chan->hs_hcon = hchan->conn;
4780 chan->hs_hcon->l2cap_data = chan->conn;
4781 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4782 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4783
4784 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4785 } else {
4786 /* Wait for logical link to be ready */
4787 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4788 }
4789 } else {
4790 /* Logical link not available */
4791 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4792 }
4793 }
4794
4795 static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4796 {
4797 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4798 u8 rsp_result;
4799 if (result == -EINVAL)
4800 rsp_result = L2CAP_MR_BAD_ID;
4801 else
4802 rsp_result = L2CAP_MR_NOT_ALLOWED;
4803
4804 l2cap_send_move_chan_rsp(chan, rsp_result);
4805 }
4806
4807 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4808 chan->move_state = L2CAP_MOVE_STABLE;
4809
4810 /* Restart data transmission */
4811 l2cap_ertm_send(chan);
4812 }
4813
4814 /* Invoke with locked chan */
4815 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
4816 {
4817 u8 local_amp_id = chan->local_amp_id;
4818 u8 remote_amp_id = chan->remote_amp_id;
4819
4820 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4821 chan, result, local_amp_id, remote_amp_id);
4822
4823 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4824 l2cap_chan_unlock(chan);
4825 return;
4826 }
4827
4828 if (chan->state != BT_CONNECTED) {
4829 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4830 } else if (result != L2CAP_MR_SUCCESS) {
4831 l2cap_do_move_cancel(chan, result);
4832 } else {
4833 switch (chan->move_role) {
4834 case L2CAP_MOVE_ROLE_INITIATOR:
4835 l2cap_do_move_initiate(chan, local_amp_id,
4836 remote_amp_id);
4837 break;
4838 case L2CAP_MOVE_ROLE_RESPONDER:
4839 l2cap_do_move_respond(chan, result);
4840 break;
4841 default:
4842 l2cap_do_move_cancel(chan, result);
4843 break;
4844 }
4845 }
4846 }
4847
4848 static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
4849 struct l2cap_cmd_hdr *cmd,
4850 u16 cmd_len, void *data)
4851 {
4852 struct l2cap_move_chan_req *req = data;
4853 struct l2cap_move_chan_rsp rsp;
4854 struct l2cap_chan *chan;
4855 u16 icid = 0;
4856 u16 result = L2CAP_MR_NOT_ALLOWED;
4857
4858 if (cmd_len != sizeof(*req))
4859 return -EPROTO;
4860
4861 icid = le16_to_cpu(req->icid);
4862
4863 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
4864
4865 if (!conn->hs_enabled)
4866 return -EINVAL;
4867
4868 chan = l2cap_get_chan_by_dcid(conn, icid);
4869 if (!chan) {
4870 rsp.icid = cpu_to_le16(icid);
4871 rsp.result = cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4872 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4873 sizeof(rsp), &rsp);
4874 return 0;
4875 }
4876
4877 chan->ident = cmd->ident;
4878
4879 if (chan->scid < L2CAP_CID_DYN_START ||
4880 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4881 (chan->mode != L2CAP_MODE_ERTM &&
4882 chan->mode != L2CAP_MODE_STREAMING)) {
4883 result = L2CAP_MR_NOT_ALLOWED;
4884 goto send_move_response;
4885 }
4886
4887 if (chan->local_amp_id == req->dest_amp_id) {
4888 result = L2CAP_MR_SAME_ID;
4889 goto send_move_response;
4890 }
4891
4892 if (req->dest_amp_id != AMP_ID_BREDR) {
4893 struct hci_dev *hdev;
4894 hdev = hci_dev_get(req->dest_amp_id);
4895 if (!hdev || hdev->dev_type != HCI_AMP ||
4896 !test_bit(HCI_UP, &hdev->flags)) {
4897 if (hdev)
4898 hci_dev_put(hdev);
4899
4900 result = L2CAP_MR_BAD_ID;
4901 goto send_move_response;
4902 }
4903 hci_dev_put(hdev);
4904 }
4905
4906 /* Detect a move collision. Only send a collision response
4907 * if this side has "lost", otherwise proceed with the move.
4908 * The winner has the larger bd_addr.
4909 */
4910 if ((__chan_is_moving(chan) ||
4911 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4912 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
4913 result = L2CAP_MR_COLLISION;
4914 goto send_move_response;
4915 }
4916
4917 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4918 l2cap_move_setup(chan);
4919 chan->move_id = req->dest_amp_id;
4920 icid = chan->dcid;
4921
4922 if (req->dest_amp_id == AMP_ID_BREDR) {
4923 /* Moving to BR/EDR */
4924 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4925 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4926 result = L2CAP_MR_PEND;
4927 } else {
4928 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4929 result = L2CAP_MR_SUCCESS;
4930 }
4931 } else {
4932 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4933 /* Placeholder - uncomment when amp functions are available */
4934 /*amp_accept_physical(chan, req->dest_amp_id);*/
4935 result = L2CAP_MR_PEND;
4936 }
4937
4938 send_move_response:
4939 l2cap_send_move_chan_rsp(chan, result);
4940
4941 l2cap_chan_unlock(chan);
4942
4943 return 0;
4944 }
4945
4946 static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4947 {
4948 struct l2cap_chan *chan;
4949 struct hci_chan *hchan = NULL;
4950
4951 chan = l2cap_get_chan_by_scid(conn, icid);
4952 if (!chan) {
4953 l2cap_send_move_chan_cfm_icid(conn, icid);
4954 return;
4955 }
4956
4957 __clear_chan_timer(chan);
4958 if (result == L2CAP_MR_PEND)
4959 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4960
4961 switch (chan->move_state) {
4962 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4963 /* Move confirm will be sent when logical link
4964 * is complete.
4965 */
4966 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4967 break;
4968 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4969 if (result == L2CAP_MR_PEND) {
4970 break;
4971 } else if (test_bit(CONN_LOCAL_BUSY,
4972 &chan->conn_state)) {
4973 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4974 } else {
4975 /* Logical link is up or moving to BR/EDR,
4976 * proceed with move
4977 */
4978 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4979 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4980 }
4981 break;
4982 case L2CAP_MOVE_WAIT_RSP:
4983 /* Moving to AMP */
4984 if (result == L2CAP_MR_SUCCESS) {
4985 /* Remote is ready, send confirm immediately
4986 * after logical link is ready
4987 */
4988 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4989 } else {
4990 /* Both logical link and move success
4991 * are required to confirm
4992 */
4993 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4994 }
4995
4996 /* Placeholder - get hci_chan for logical link */
4997 if (!hchan) {
4998 /* Logical link not available */
4999 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5000 break;
5001 }
5002
5003 /* If the logical link is not yet connected, do not
5004 * send confirmation.
5005 */
5006 if (hchan->state != BT_CONNECTED)
5007 break;
5008
5009 /* Logical link is already ready to go */
5010
5011 chan->hs_hcon = hchan->conn;
5012 chan->hs_hcon->l2cap_data = chan->conn;
5013
5014 if (result == L2CAP_MR_SUCCESS) {
5015 /* Can confirm now */
5016 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
5017 } else {
5018 /* Now only need move success
5019 * to confirm
5020 */
5021 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
5022 }
5023
5024 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
5025 break;
5026 default:
5027 /* Any other amp move state means the move failed. */
5028 chan->move_id = chan->local_amp_id;
5029 l2cap_move_done(chan);
5030 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5031 }
5032
5033 l2cap_chan_unlock(chan);
5034 }
5035
5036 static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5037 u16 result)
5038 {
5039 struct l2cap_chan *chan;
5040
5041 chan = l2cap_get_chan_by_ident(conn, ident);
5042 if (!chan) {
5043 /* Could not locate channel, icid is best guess */
5044 l2cap_send_move_chan_cfm_icid(conn, icid);
5045 return;
5046 }
5047
5048 __clear_chan_timer(chan);
5049
5050 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5051 if (result == L2CAP_MR_COLLISION) {
5052 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5053 } else {
5054 /* Cleanup - cancel move */
5055 chan->move_id = chan->local_amp_id;
5056 l2cap_move_done(chan);
5057 }
5058 }
5059
5060 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5061
5062 l2cap_chan_unlock(chan);
5063 }
5064
5065 static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5066 struct l2cap_cmd_hdr *cmd,
5067 u16 cmd_len, void *data)
5068 {
5069 struct l2cap_move_chan_rsp *rsp = data;
5070 u16 icid, result;
5071
5072 if (cmd_len != sizeof(*rsp))
5073 return -EPROTO;
5074
5075 icid = le16_to_cpu(rsp->icid);
5076 result = le16_to_cpu(rsp->result);
5077
5078 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5079
5080 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5081 l2cap_move_continue(conn, icid, result);
5082 else
5083 l2cap_move_fail(conn, cmd->ident, icid, result);
5084
5085 return 0;
5086 }
5087
5088 static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5089 struct l2cap_cmd_hdr *cmd,
5090 u16 cmd_len, void *data)
5091 {
5092 struct l2cap_move_chan_cfm *cfm = data;
5093 struct l2cap_chan *chan;
5094 u16 icid, result;
5095
5096 if (cmd_len != sizeof(*cfm))
5097 return -EPROTO;
5098
5099 icid = le16_to_cpu(cfm->icid);
5100 result = le16_to_cpu(cfm->result);
5101
5102 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5103
5104 chan = l2cap_get_chan_by_dcid(conn, icid);
5105 if (!chan) {
5106 /* Spec requires a response even if the icid was not found */
5107 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5108 return 0;
5109 }
5110
5111 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5112 if (result == L2CAP_MC_CONFIRMED) {
5113 chan->local_amp_id = chan->move_id;
5114 if (chan->local_amp_id == AMP_ID_BREDR)
5115 __release_logical_link(chan);
5116 } else {
5117 chan->move_id = chan->local_amp_id;
5118 }
5119
5120 l2cap_move_done(chan);
5121 }
5122
5123 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5124
5125 l2cap_chan_unlock(chan);
5126
5127 return 0;
5128 }
5129
5130 static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
5131 struct l2cap_cmd_hdr *cmd,
5132 u16 cmd_len, void *data)
5133 {
5134 struct l2cap_move_chan_cfm_rsp *rsp = data;
5135 struct l2cap_chan *chan;
5136 u16 icid;
5137
5138 if (cmd_len != sizeof(*rsp))
5139 return -EPROTO;
5140
5141 icid = le16_to_cpu(rsp->icid);
5142
5143 BT_DBG("icid 0x%4.4x", icid);
5144
5145 chan = l2cap_get_chan_by_scid(conn, icid);
5146 if (!chan)
5147 return 0;
5148
5149 __clear_chan_timer(chan);
5150
5151 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5152 chan->local_amp_id = chan->move_id;
5153
5154 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
5155 __release_logical_link(chan);
5156
5157 l2cap_move_done(chan);
5158 }
5159
5160 l2cap_chan_unlock(chan);
5161
5162 return 0;
5163 }
5164
5165 static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
5166 struct l2cap_cmd_hdr *cmd,
5167 u16 cmd_len, u8 *data)
5168 {
5169 struct hci_conn *hcon = conn->hcon;
5170 struct l2cap_conn_param_update_req *req;
5171 struct l2cap_conn_param_update_rsp rsp;
5172 u16 min, max, latency, to_multiplier;
5173 int err;
5174
5175 if (hcon->role != HCI_ROLE_MASTER)
5176 return -EINVAL;
5177
5178 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5179 return -EPROTO;
5180
5181 req = (struct l2cap_conn_param_update_req *) data;
5182 min = __le16_to_cpu(req->min);
5183 max = __le16_to_cpu(req->max);
5184 latency = __le16_to_cpu(req->latency);
5185 to_multiplier = __le16_to_cpu(req->to_multiplier);
5186
5187 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
5188 min, max, latency, to_multiplier);
5189
5190 memset(&rsp, 0, sizeof(rsp));
5191
5192 err = hci_check_conn_params(min, max, latency, to_multiplier);
5193 if (err)
5194 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
5195 else
5196 rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
5197
5198 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
5199 sizeof(rsp), &rsp);
5200
5201 if (!err) {
5202 u8 store_hint;
5203
5204 store_hint = hci_le_conn_update(hcon, min, max, latency,
5205 to_multiplier);
5206 mgmt_new_conn_param(hcon->hdev, &hcon->dst, hcon->dst_type,
5207 store_hint, min, max, latency,
5208 to_multiplier);
5209
5210 }
5211
5212 return 0;
5213 }
5214
5215 static int l2cap_le_connect_rsp(struct l2cap_conn *conn,
5216 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5217 u8 *data)
5218 {
5219 struct l2cap_le_conn_rsp *rsp = (struct l2cap_le_conn_rsp *) data;
5220 u16 dcid, mtu, mps, credits, result;
5221 struct l2cap_chan *chan;
5222 int err;
5223
5224 if (cmd_len < sizeof(*rsp))
5225 return -EPROTO;
5226
5227 dcid = __le16_to_cpu(rsp->dcid);
5228 mtu = __le16_to_cpu(rsp->mtu);
5229 mps = __le16_to_cpu(rsp->mps);
5230 credits = __le16_to_cpu(rsp->credits);
5231 result = __le16_to_cpu(rsp->result);
5232
5233 if (result == L2CAP_CR_SUCCESS && (mtu < 23 || mps < 23))
5234 return -EPROTO;
5235
5236 BT_DBG("dcid 0x%4.4x mtu %u mps %u credits %u result 0x%2.2x",
5237 dcid, mtu, mps, credits, result);
5238
5239 mutex_lock(&conn->chan_lock);
5240
5241 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5242 if (!chan) {
5243 err = -EBADSLT;
5244 goto unlock;
5245 }
5246
5247 err = 0;
5248
5249 l2cap_chan_lock(chan);
5250
5251 switch (result) {
5252 case L2CAP_CR_SUCCESS:
5253 chan->ident = 0;
5254 chan->dcid = dcid;
5255 chan->omtu = mtu;
5256 chan->remote_mps = mps;
5257 chan->tx_credits = credits;
5258 l2cap_chan_ready(chan);
5259 break;
5260
5261 default:
5262 l2cap_chan_del(chan, ECONNREFUSED);
5263 break;
5264 }
5265
5266 l2cap_chan_unlock(chan);
5267
5268 unlock:
5269 mutex_unlock(&conn->chan_lock);
5270
5271 return err;
5272 }
5273
5274 static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
5275 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5276 u8 *data)
5277 {
5278 int err = 0;
5279
5280 switch (cmd->code) {
5281 case L2CAP_COMMAND_REJ:
5282 l2cap_command_rej(conn, cmd, cmd_len, data);
5283 break;
5284
5285 case L2CAP_CONN_REQ:
5286 err = l2cap_connect_req(conn, cmd, cmd_len, data);
5287 break;
5288
5289 case L2CAP_CONN_RSP:
5290 case L2CAP_CREATE_CHAN_RSP:
5291 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
5292 break;
5293
5294 case L2CAP_CONF_REQ:
5295 err = l2cap_config_req(conn, cmd, cmd_len, data);
5296 break;
5297
5298 case L2CAP_CONF_RSP:
5299 l2cap_config_rsp(conn, cmd, cmd_len, data);
5300 break;
5301
5302 case L2CAP_DISCONN_REQ:
5303 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5304 break;
5305
5306 case L2CAP_DISCONN_RSP:
5307 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5308 break;
5309
5310 case L2CAP_ECHO_REQ:
5311 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5312 break;
5313
5314 case L2CAP_ECHO_RSP:
5315 break;
5316
5317 case L2CAP_INFO_REQ:
5318 err = l2cap_information_req(conn, cmd, cmd_len, data);
5319 break;
5320
5321 case L2CAP_INFO_RSP:
5322 l2cap_information_rsp(conn, cmd, cmd_len, data);
5323 break;
5324
5325 case L2CAP_CREATE_CHAN_REQ:
5326 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5327 break;
5328
5329 case L2CAP_MOVE_CHAN_REQ:
5330 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5331 break;
5332
5333 case L2CAP_MOVE_CHAN_RSP:
5334 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5335 break;
5336
5337 case L2CAP_MOVE_CHAN_CFM:
5338 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5339 break;
5340
5341 case L2CAP_MOVE_CHAN_CFM_RSP:
5342 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5343 break;
5344
5345 default:
5346 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5347 err = -EINVAL;
5348 break;
5349 }
5350
5351 return err;
5352 }
5353
5354 static int l2cap_le_connect_req(struct l2cap_conn *conn,
5355 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5356 u8 *data)
5357 {
5358 struct l2cap_le_conn_req *req = (struct l2cap_le_conn_req *) data;
5359 struct l2cap_le_conn_rsp rsp;
5360 struct l2cap_chan *chan, *pchan;
5361 u16 dcid, scid, credits, mtu, mps;
5362 __le16 psm;
5363 u8 result;
5364
5365 if (cmd_len != sizeof(*req))
5366 return -EPROTO;
5367
5368 scid = __le16_to_cpu(req->scid);
5369 mtu = __le16_to_cpu(req->mtu);
5370 mps = __le16_to_cpu(req->mps);
5371 psm = req->psm;
5372 dcid = 0;
5373 credits = 0;
5374
5375 if (mtu < 23 || mps < 23)
5376 return -EPROTO;
5377
5378 BT_DBG("psm 0x%2.2x scid 0x%4.4x mtu %u mps %u", __le16_to_cpu(psm),
5379 scid, mtu, mps);
5380
5381 /* Check if we have socket listening on psm */
5382 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
5383 &conn->hcon->dst, LE_LINK);
5384 if (!pchan) {
5385 result = L2CAP_CR_BAD_PSM;
5386 chan = NULL;
5387 goto response;
5388 }
5389
5390 mutex_lock(&conn->chan_lock);
5391 l2cap_chan_lock(pchan);
5392
5393 if (!smp_sufficient_security(conn->hcon, pchan->sec_level)) {
5394 result = L2CAP_CR_AUTHENTICATION;
5395 chan = NULL;
5396 goto response_unlock;
5397 }
5398
5399 /* Check if we already have channel with that dcid */
5400 if (__l2cap_get_chan_by_dcid(conn, scid)) {
5401 result = L2CAP_CR_NO_MEM;
5402 chan = NULL;
5403 goto response_unlock;
5404 }
5405
5406 chan = pchan->ops->new_connection(pchan);
5407 if (!chan) {
5408 result = L2CAP_CR_NO_MEM;
5409 goto response_unlock;
5410 }
5411
5412 l2cap_le_flowctl_init(chan);
5413
5414 bacpy(&chan->src, &conn->hcon->src);
5415 bacpy(&chan->dst, &conn->hcon->dst);
5416 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
5417 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
5418 chan->psm = psm;
5419 chan->dcid = scid;
5420 chan->omtu = mtu;
5421 chan->remote_mps = mps;
5422 chan->tx_credits = __le16_to_cpu(req->credits);
5423
5424 __l2cap_chan_add(conn, chan);
5425 dcid = chan->scid;
5426 credits = chan->rx_credits;
5427
5428 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
5429
5430 chan->ident = cmd->ident;
5431
5432 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
5433 l2cap_state_change(chan, BT_CONNECT2);
5434 /* The following result value is actually not defined
5435 * for LE CoC but we use it to let the function know
5436 * that it should bail out after doing its cleanup
5437 * instead of sending a response.
5438 */
5439 result = L2CAP_CR_PEND;
5440 chan->ops->defer(chan);
5441 } else {
5442 l2cap_chan_ready(chan);
5443 result = L2CAP_CR_SUCCESS;
5444 }
5445
5446 response_unlock:
5447 l2cap_chan_unlock(pchan);
5448 mutex_unlock(&conn->chan_lock);
5449 l2cap_chan_put(pchan);
5450
5451 if (result == L2CAP_CR_PEND)
5452 return 0;
5453
5454 response:
5455 if (chan) {
5456 rsp.mtu = cpu_to_le16(chan->imtu);
5457 rsp.mps = cpu_to_le16(chan->mps);
5458 } else {
5459 rsp.mtu = 0;
5460 rsp.mps = 0;
5461 }
5462
5463 rsp.dcid = cpu_to_le16(dcid);
5464 rsp.credits = cpu_to_le16(credits);
5465 rsp.result = cpu_to_le16(result);
5466
5467 l2cap_send_cmd(conn, cmd->ident, L2CAP_LE_CONN_RSP, sizeof(rsp), &rsp);
5468
5469 return 0;
5470 }
5471
5472 static inline int l2cap_le_credits(struct l2cap_conn *conn,
5473 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5474 u8 *data)
5475 {
5476 struct l2cap_le_credits *pkt;
5477 struct l2cap_chan *chan;
5478 u16 cid, credits, max_credits;
5479
5480 if (cmd_len != sizeof(*pkt))
5481 return -EPROTO;
5482
5483 pkt = (struct l2cap_le_credits *) data;
5484 cid = __le16_to_cpu(pkt->cid);
5485 credits = __le16_to_cpu(pkt->credits);
5486
5487 BT_DBG("cid 0x%4.4x credits 0x%4.4x", cid, credits);
5488
5489 chan = l2cap_get_chan_by_dcid(conn, cid);
5490 if (!chan)
5491 return -EBADSLT;
5492
5493 max_credits = LE_FLOWCTL_MAX_CREDITS - chan->tx_credits;
5494 if (credits > max_credits) {
5495 BT_ERR("LE credits overflow");
5496 l2cap_send_disconn_req(chan, ECONNRESET);
5497
5498 /* Return 0 so that we don't trigger an unnecessary
5499 * command reject packet.
5500 */
5501 return 0;
5502 }
5503
5504 chan->tx_credits += credits;
5505
5506 while (chan->tx_credits && !skb_queue_empty(&chan->tx_q)) {
5507 l2cap_do_send(chan, skb_dequeue(&chan->tx_q));
5508 chan->tx_credits--;
5509 }
5510
5511 if (chan->tx_credits)
5512 chan->ops->resume(chan);
5513
5514 l2cap_chan_unlock(chan);
5515
5516 return 0;
5517 }
5518
5519 static inline int l2cap_le_command_rej(struct l2cap_conn *conn,
5520 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5521 u8 *data)
5522 {
5523 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
5524 struct l2cap_chan *chan;
5525
5526 if (cmd_len < sizeof(*rej))
5527 return -EPROTO;
5528
5529 mutex_lock(&conn->chan_lock);
5530
5531 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
5532 if (!chan)
5533 goto done;
5534
5535 l2cap_chan_lock(chan);
5536 l2cap_chan_del(chan, ECONNREFUSED);
5537 l2cap_chan_unlock(chan);
5538
5539 done:
5540 mutex_unlock(&conn->chan_lock);
5541 return 0;
5542 }
5543
5544 static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
5545 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5546 u8 *data)
5547 {
5548 int err = 0;
5549
5550 switch (cmd->code) {
5551 case L2CAP_COMMAND_REJ:
5552 l2cap_le_command_rej(conn, cmd, cmd_len, data);
5553 break;
5554
5555 case L2CAP_CONN_PARAM_UPDATE_REQ:
5556 err = l2cap_conn_param_update_req(conn, cmd, cmd_len, data);
5557 break;
5558
5559 case L2CAP_CONN_PARAM_UPDATE_RSP:
5560 break;
5561
5562 case L2CAP_LE_CONN_RSP:
5563 l2cap_le_connect_rsp(conn, cmd, cmd_len, data);
5564 break;
5565
5566 case L2CAP_LE_CONN_REQ:
5567 err = l2cap_le_connect_req(conn, cmd, cmd_len, data);
5568 break;
5569
5570 case L2CAP_LE_CREDITS:
5571 err = l2cap_le_credits(conn, cmd, cmd_len, data);
5572 break;
5573
5574 case L2CAP_DISCONN_REQ:
5575 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5576 break;
5577
5578 case L2CAP_DISCONN_RSP:
5579 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5580 break;
5581
5582 default:
5583 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5584 err = -EINVAL;
5585 break;
5586 }
5587
5588 return err;
5589 }
5590
5591 static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5592 struct sk_buff *skb)
5593 {
5594 struct hci_conn *hcon = conn->hcon;
5595 struct l2cap_cmd_hdr *cmd;
5596 u16 len;
5597 int err;
5598
5599 if (hcon->type != LE_LINK)
5600 goto drop;
5601
5602 if (skb->len < L2CAP_CMD_HDR_SIZE)
5603 goto drop;
5604
5605 cmd = (void *) skb->data;
5606 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
5607
5608 len = le16_to_cpu(cmd->len);
5609
5610 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
5611
5612 if (len != skb->len || !cmd->ident) {
5613 BT_DBG("corrupted command");
5614 goto drop;
5615 }
5616
5617 err = l2cap_le_sig_cmd(conn, cmd, len, skb->data);
5618 if (err) {
5619 struct l2cap_cmd_rej_unk rej;
5620
5621 BT_ERR("Wrong link type (%d)", err);
5622
5623 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5624 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5625 sizeof(rej), &rej);
5626 }
5627
5628 drop:
5629 kfree_skb(skb);
5630 }
5631
5632 static inline void l2cap_sig_channel(struct l2cap_conn *conn,
5633 struct sk_buff *skb)
5634 {
5635 struct hci_conn *hcon = conn->hcon;
5636 u8 *data = skb->data;
5637 int len = skb->len;
5638 struct l2cap_cmd_hdr cmd;
5639 int err;
5640
5641 l2cap_raw_recv(conn, skb);
5642
5643 if (hcon->type != ACL_LINK)
5644 goto drop;
5645
5646 while (len >= L2CAP_CMD_HDR_SIZE) {
5647 u16 cmd_len;
5648 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5649 data += L2CAP_CMD_HDR_SIZE;
5650 len -= L2CAP_CMD_HDR_SIZE;
5651
5652 cmd_len = le16_to_cpu(cmd.len);
5653
5654 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5655 cmd.ident);
5656
5657 if (cmd_len > len || !cmd.ident) {
5658 BT_DBG("corrupted command");
5659 break;
5660 }
5661
5662 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
5663 if (err) {
5664 struct l2cap_cmd_rej_unk rej;
5665
5666 BT_ERR("Wrong link type (%d)", err);
5667
5668 rej.reason = cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5669 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5670 sizeof(rej), &rej);
5671 }
5672
5673 data += cmd_len;
5674 len -= cmd_len;
5675 }
5676
5677 drop:
5678 kfree_skb(skb);
5679 }
5680
5681 static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
5682 {
5683 u16 our_fcs, rcv_fcs;
5684 int hdr_size;
5685
5686 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5687 hdr_size = L2CAP_EXT_HDR_SIZE;
5688 else
5689 hdr_size = L2CAP_ENH_HDR_SIZE;
5690
5691 if (chan->fcs == L2CAP_FCS_CRC16) {
5692 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
5693 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5694 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5695
5696 if (our_fcs != rcv_fcs)
5697 return -EBADMSG;
5698 }
5699 return 0;
5700 }
5701
5702 static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
5703 {
5704 struct l2cap_ctrl control;
5705
5706 BT_DBG("chan %p", chan);
5707
5708 memset(&control, 0, sizeof(control));
5709 control.sframe = 1;
5710 control.final = 1;
5711 control.reqseq = chan->buffer_seq;
5712 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5713
5714 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5715 control.super = L2CAP_SUPER_RNR;
5716 l2cap_send_sframe(chan, &control);
5717 }
5718
5719 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5720 chan->unacked_frames > 0)
5721 __set_retrans_timer(chan);
5722
5723 /* Send pending iframes */
5724 l2cap_ertm_send(chan);
5725
5726 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
5727 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5728 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5729 * send it now.
5730 */
5731 control.super = L2CAP_SUPER_RR;
5732 l2cap_send_sframe(chan, &control);
5733 }
5734 }
5735
5736 static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5737 struct sk_buff **last_frag)
5738 {
5739 /* skb->len reflects data in skb as well as all fragments
5740 * skb->data_len reflects only data in fragments
5741 */
5742 if (!skb_has_frag_list(skb))
5743 skb_shinfo(skb)->frag_list = new_frag;
5744
5745 new_frag->next = NULL;
5746
5747 (*last_frag)->next = new_frag;
5748 *last_frag = new_frag;
5749
5750 skb->len += new_frag->len;
5751 skb->data_len += new_frag->len;
5752 skb->truesize += new_frag->truesize;
5753 }
5754
5755 static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5756 struct l2cap_ctrl *control)
5757 {
5758 int err = -EINVAL;
5759
5760 switch (control->sar) {
5761 case L2CAP_SAR_UNSEGMENTED:
5762 if (chan->sdu)
5763 break;
5764
5765 err = chan->ops->recv(chan, skb);
5766 break;
5767
5768 case L2CAP_SAR_START:
5769 if (chan->sdu)
5770 break;
5771
5772 chan->sdu_len = get_unaligned_le16(skb->data);
5773 skb_pull(skb, L2CAP_SDULEN_SIZE);
5774
5775 if (chan->sdu_len > chan->imtu) {
5776 err = -EMSGSIZE;
5777 break;
5778 }
5779
5780 if (skb->len >= chan->sdu_len)
5781 break;
5782
5783 chan->sdu = skb;
5784 chan->sdu_last_frag = skb;
5785
5786 skb = NULL;
5787 err = 0;
5788 break;
5789
5790 case L2CAP_SAR_CONTINUE:
5791 if (!chan->sdu)
5792 break;
5793
5794 append_skb_frag(chan->sdu, skb,
5795 &chan->sdu_last_frag);
5796 skb = NULL;
5797
5798 if (chan->sdu->len >= chan->sdu_len)
5799 break;
5800
5801 err = 0;
5802 break;
5803
5804 case L2CAP_SAR_END:
5805 if (!chan->sdu)
5806 break;
5807
5808 append_skb_frag(chan->sdu, skb,
5809 &chan->sdu_last_frag);
5810 skb = NULL;
5811
5812 if (chan->sdu->len != chan->sdu_len)
5813 break;
5814
5815 err = chan->ops->recv(chan, chan->sdu);
5816
5817 if (!err) {
5818 /* Reassembly complete */
5819 chan->sdu = NULL;
5820 chan->sdu_last_frag = NULL;
5821 chan->sdu_len = 0;
5822 }
5823 break;
5824 }
5825
5826 if (err) {
5827 kfree_skb(skb);
5828 kfree_skb(chan->sdu);
5829 chan->sdu = NULL;
5830 chan->sdu_last_frag = NULL;
5831 chan->sdu_len = 0;
5832 }
5833
5834 return err;
5835 }
5836
5837 static int l2cap_resegment(struct l2cap_chan *chan)
5838 {
5839 /* Placeholder */
5840 return 0;
5841 }
5842
5843 void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
5844 {
5845 u8 event;
5846
5847 if (chan->mode != L2CAP_MODE_ERTM)
5848 return;
5849
5850 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
5851 l2cap_tx(chan, NULL, NULL, event);
5852 }
5853
5854 static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5855 {
5856 int err = 0;
5857 /* Pass sequential frames to l2cap_reassemble_sdu()
5858 * until a gap is encountered.
5859 */
5860
5861 BT_DBG("chan %p", chan);
5862
5863 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5864 struct sk_buff *skb;
5865 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5866 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5867
5868 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5869
5870 if (!skb)
5871 break;
5872
5873 skb_unlink(skb, &chan->srej_q);
5874 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5875 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5876 if (err)
5877 break;
5878 }
5879
5880 if (skb_queue_empty(&chan->srej_q)) {
5881 chan->rx_state = L2CAP_RX_STATE_RECV;
5882 l2cap_send_ack(chan);
5883 }
5884
5885 return err;
5886 }
5887
5888 static void l2cap_handle_srej(struct l2cap_chan *chan,
5889 struct l2cap_ctrl *control)
5890 {
5891 struct sk_buff *skb;
5892
5893 BT_DBG("chan %p, control %p", chan, control);
5894
5895 if (control->reqseq == chan->next_tx_seq) {
5896 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5897 l2cap_send_disconn_req(chan, ECONNRESET);
5898 return;
5899 }
5900
5901 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5902
5903 if (skb == NULL) {
5904 BT_DBG("Seq %d not available for retransmission",
5905 control->reqseq);
5906 return;
5907 }
5908
5909 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5910 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5911 l2cap_send_disconn_req(chan, ECONNRESET);
5912 return;
5913 }
5914
5915 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5916
5917 if (control->poll) {
5918 l2cap_pass_to_tx(chan, control);
5919
5920 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5921 l2cap_retransmit(chan, control);
5922 l2cap_ertm_send(chan);
5923
5924 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5925 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5926 chan->srej_save_reqseq = control->reqseq;
5927 }
5928 } else {
5929 l2cap_pass_to_tx_fbit(chan, control);
5930
5931 if (control->final) {
5932 if (chan->srej_save_reqseq != control->reqseq ||
5933 !test_and_clear_bit(CONN_SREJ_ACT,
5934 &chan->conn_state))
5935 l2cap_retransmit(chan, control);
5936 } else {
5937 l2cap_retransmit(chan, control);
5938 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5939 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5940 chan->srej_save_reqseq = control->reqseq;
5941 }
5942 }
5943 }
5944 }
5945
5946 static void l2cap_handle_rej(struct l2cap_chan *chan,
5947 struct l2cap_ctrl *control)
5948 {
5949 struct sk_buff *skb;
5950
5951 BT_DBG("chan %p, control %p", chan, control);
5952
5953 if (control->reqseq == chan->next_tx_seq) {
5954 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5955 l2cap_send_disconn_req(chan, ECONNRESET);
5956 return;
5957 }
5958
5959 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5960
5961 if (chan->max_tx && skb &&
5962 bt_cb(skb)->control.retries >= chan->max_tx) {
5963 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5964 l2cap_send_disconn_req(chan, ECONNRESET);
5965 return;
5966 }
5967
5968 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5969
5970 l2cap_pass_to_tx(chan, control);
5971
5972 if (control->final) {
5973 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5974 l2cap_retransmit_all(chan, control);
5975 } else {
5976 l2cap_retransmit_all(chan, control);
5977 l2cap_ertm_send(chan);
5978 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5979 set_bit(CONN_REJ_ACT, &chan->conn_state);
5980 }
5981 }
5982
5983 static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5984 {
5985 BT_DBG("chan %p, txseq %d", chan, txseq);
5986
5987 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5988 chan->expected_tx_seq);
5989
5990 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5991 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5992 chan->tx_win) {
5993 /* See notes below regarding "double poll" and
5994 * invalid packets.
5995 */
5996 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5997 BT_DBG("Invalid/Ignore - after SREJ");
5998 return L2CAP_TXSEQ_INVALID_IGNORE;
5999 } else {
6000 BT_DBG("Invalid - in window after SREJ sent");
6001 return L2CAP_TXSEQ_INVALID;
6002 }
6003 }
6004
6005 if (chan->srej_list.head == txseq) {
6006 BT_DBG("Expected SREJ");
6007 return L2CAP_TXSEQ_EXPECTED_SREJ;
6008 }
6009
6010 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
6011 BT_DBG("Duplicate SREJ - txseq already stored");
6012 return L2CAP_TXSEQ_DUPLICATE_SREJ;
6013 }
6014
6015 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
6016 BT_DBG("Unexpected SREJ - not requested");
6017 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
6018 }
6019 }
6020
6021 if (chan->expected_tx_seq == txseq) {
6022 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
6023 chan->tx_win) {
6024 BT_DBG("Invalid - txseq outside tx window");
6025 return L2CAP_TXSEQ_INVALID;
6026 } else {
6027 BT_DBG("Expected");
6028 return L2CAP_TXSEQ_EXPECTED;
6029 }
6030 }
6031
6032 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
6033 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
6034 BT_DBG("Duplicate - expected_tx_seq later than txseq");
6035 return L2CAP_TXSEQ_DUPLICATE;
6036 }
6037
6038 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
6039 /* A source of invalid packets is a "double poll" condition,
6040 * where delays cause us to send multiple poll packets. If
6041 * the remote stack receives and processes both polls,
6042 * sequence numbers can wrap around in such a way that a
6043 * resent frame has a sequence number that looks like new data
6044 * with a sequence gap. This would trigger an erroneous SREJ
6045 * request.
6046 *
6047 * Fortunately, this is impossible with a tx window that's
6048 * less than half of the maximum sequence number, which allows
6049 * invalid frames to be safely ignored.
6050 *
6051 * With tx window sizes greater than half of the tx window
6052 * maximum, the frame is invalid and cannot be ignored. This
6053 * causes a disconnect.
6054 */
6055
6056 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
6057 BT_DBG("Invalid/Ignore - txseq outside tx window");
6058 return L2CAP_TXSEQ_INVALID_IGNORE;
6059 } else {
6060 BT_DBG("Invalid - txseq outside tx window");
6061 return L2CAP_TXSEQ_INVALID;
6062 }
6063 } else {
6064 BT_DBG("Unexpected - txseq indicates missing frames");
6065 return L2CAP_TXSEQ_UNEXPECTED;
6066 }
6067 }
6068
6069 static int l2cap_rx_state_recv(struct l2cap_chan *chan,
6070 struct l2cap_ctrl *control,
6071 struct sk_buff *skb, u8 event)
6072 {
6073 int err = 0;
6074 bool skb_in_use = false;
6075
6076 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6077 event);
6078
6079 switch (event) {
6080 case L2CAP_EV_RECV_IFRAME:
6081 switch (l2cap_classify_txseq(chan, control->txseq)) {
6082 case L2CAP_TXSEQ_EXPECTED:
6083 l2cap_pass_to_tx(chan, control);
6084
6085 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6086 BT_DBG("Busy, discarding expected seq %d",
6087 control->txseq);
6088 break;
6089 }
6090
6091 chan->expected_tx_seq = __next_seq(chan,
6092 control->txseq);
6093
6094 chan->buffer_seq = chan->expected_tx_seq;
6095 skb_in_use = true;
6096
6097 err = l2cap_reassemble_sdu(chan, skb, control);
6098 if (err)
6099 break;
6100
6101 if (control->final) {
6102 if (!test_and_clear_bit(CONN_REJ_ACT,
6103 &chan->conn_state)) {
6104 control->final = 0;
6105 l2cap_retransmit_all(chan, control);
6106 l2cap_ertm_send(chan);
6107 }
6108 }
6109
6110 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
6111 l2cap_send_ack(chan);
6112 break;
6113 case L2CAP_TXSEQ_UNEXPECTED:
6114 l2cap_pass_to_tx(chan, control);
6115
6116 /* Can't issue SREJ frames in the local busy state.
6117 * Drop this frame, it will be seen as missing
6118 * when local busy is exited.
6119 */
6120 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
6121 BT_DBG("Busy, discarding unexpected seq %d",
6122 control->txseq);
6123 break;
6124 }
6125
6126 /* There was a gap in the sequence, so an SREJ
6127 * must be sent for each missing frame. The
6128 * current frame is stored for later use.
6129 */
6130 skb_queue_tail(&chan->srej_q, skb);
6131 skb_in_use = true;
6132 BT_DBG("Queued %p (queue len %d)", skb,
6133 skb_queue_len(&chan->srej_q));
6134
6135 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
6136 l2cap_seq_list_clear(&chan->srej_list);
6137 l2cap_send_srej(chan, control->txseq);
6138
6139 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
6140 break;
6141 case L2CAP_TXSEQ_DUPLICATE:
6142 l2cap_pass_to_tx(chan, control);
6143 break;
6144 case L2CAP_TXSEQ_INVALID_IGNORE:
6145 break;
6146 case L2CAP_TXSEQ_INVALID:
6147 default:
6148 l2cap_send_disconn_req(chan, ECONNRESET);
6149 break;
6150 }
6151 break;
6152 case L2CAP_EV_RECV_RR:
6153 l2cap_pass_to_tx(chan, control);
6154 if (control->final) {
6155 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6156
6157 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
6158 !__chan_is_moving(chan)) {
6159 control->final = 0;
6160 l2cap_retransmit_all(chan, control);
6161 }
6162
6163 l2cap_ertm_send(chan);
6164 } else if (control->poll) {
6165 l2cap_send_i_or_rr_or_rnr(chan);
6166 } else {
6167 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6168 &chan->conn_state) &&
6169 chan->unacked_frames)
6170 __set_retrans_timer(chan);
6171
6172 l2cap_ertm_send(chan);
6173 }
6174 break;
6175 case L2CAP_EV_RECV_RNR:
6176 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6177 l2cap_pass_to_tx(chan, control);
6178 if (control && control->poll) {
6179 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6180 l2cap_send_rr_or_rnr(chan, 0);
6181 }
6182 __clear_retrans_timer(chan);
6183 l2cap_seq_list_clear(&chan->retrans_list);
6184 break;
6185 case L2CAP_EV_RECV_REJ:
6186 l2cap_handle_rej(chan, control);
6187 break;
6188 case L2CAP_EV_RECV_SREJ:
6189 l2cap_handle_srej(chan, control);
6190 break;
6191 default:
6192 break;
6193 }
6194
6195 if (skb && !skb_in_use) {
6196 BT_DBG("Freeing %p", skb);
6197 kfree_skb(skb);
6198 }
6199
6200 return err;
6201 }
6202
6203 static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
6204 struct l2cap_ctrl *control,
6205 struct sk_buff *skb, u8 event)
6206 {
6207 int err = 0;
6208 u16 txseq = control->txseq;
6209 bool skb_in_use = false;
6210
6211 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6212 event);
6213
6214 switch (event) {
6215 case L2CAP_EV_RECV_IFRAME:
6216 switch (l2cap_classify_txseq(chan, txseq)) {
6217 case L2CAP_TXSEQ_EXPECTED:
6218 /* Keep frame for reassembly later */
6219 l2cap_pass_to_tx(chan, control);
6220 skb_queue_tail(&chan->srej_q, skb);
6221 skb_in_use = true;
6222 BT_DBG("Queued %p (queue len %d)", skb,
6223 skb_queue_len(&chan->srej_q));
6224
6225 chan->expected_tx_seq = __next_seq(chan, txseq);
6226 break;
6227 case L2CAP_TXSEQ_EXPECTED_SREJ:
6228 l2cap_seq_list_pop(&chan->srej_list);
6229
6230 l2cap_pass_to_tx(chan, control);
6231 skb_queue_tail(&chan->srej_q, skb);
6232 skb_in_use = true;
6233 BT_DBG("Queued %p (queue len %d)", skb,
6234 skb_queue_len(&chan->srej_q));
6235
6236 err = l2cap_rx_queued_iframes(chan);
6237 if (err)
6238 break;
6239
6240 break;
6241 case L2CAP_TXSEQ_UNEXPECTED:
6242 /* Got a frame that can't be reassembled yet.
6243 * Save it for later, and send SREJs to cover
6244 * the missing frames.
6245 */
6246 skb_queue_tail(&chan->srej_q, skb);
6247 skb_in_use = true;
6248 BT_DBG("Queued %p (queue len %d)", skb,
6249 skb_queue_len(&chan->srej_q));
6250
6251 l2cap_pass_to_tx(chan, control);
6252 l2cap_send_srej(chan, control->txseq);
6253 break;
6254 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
6255 /* This frame was requested with an SREJ, but
6256 * some expected retransmitted frames are
6257 * missing. Request retransmission of missing
6258 * SREJ'd frames.
6259 */
6260 skb_queue_tail(&chan->srej_q, skb);
6261 skb_in_use = true;
6262 BT_DBG("Queued %p (queue len %d)", skb,
6263 skb_queue_len(&chan->srej_q));
6264
6265 l2cap_pass_to_tx(chan, control);
6266 l2cap_send_srej_list(chan, control->txseq);
6267 break;
6268 case L2CAP_TXSEQ_DUPLICATE_SREJ:
6269 /* We've already queued this frame. Drop this copy. */
6270 l2cap_pass_to_tx(chan, control);
6271 break;
6272 case L2CAP_TXSEQ_DUPLICATE:
6273 /* Expecting a later sequence number, so this frame
6274 * was already received. Ignore it completely.
6275 */
6276 break;
6277 case L2CAP_TXSEQ_INVALID_IGNORE:
6278 break;
6279 case L2CAP_TXSEQ_INVALID:
6280 default:
6281 l2cap_send_disconn_req(chan, ECONNRESET);
6282 break;
6283 }
6284 break;
6285 case L2CAP_EV_RECV_RR:
6286 l2cap_pass_to_tx(chan, control);
6287 if (control->final) {
6288 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6289
6290 if (!test_and_clear_bit(CONN_REJ_ACT,
6291 &chan->conn_state)) {
6292 control->final = 0;
6293 l2cap_retransmit_all(chan, control);
6294 }
6295
6296 l2cap_ertm_send(chan);
6297 } else if (control->poll) {
6298 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6299 &chan->conn_state) &&
6300 chan->unacked_frames) {
6301 __set_retrans_timer(chan);
6302 }
6303
6304 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6305 l2cap_send_srej_tail(chan);
6306 } else {
6307 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6308 &chan->conn_state) &&
6309 chan->unacked_frames)
6310 __set_retrans_timer(chan);
6311
6312 l2cap_send_ack(chan);
6313 }
6314 break;
6315 case L2CAP_EV_RECV_RNR:
6316 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6317 l2cap_pass_to_tx(chan, control);
6318 if (control->poll) {
6319 l2cap_send_srej_tail(chan);
6320 } else {
6321 struct l2cap_ctrl rr_control;
6322 memset(&rr_control, 0, sizeof(rr_control));
6323 rr_control.sframe = 1;
6324 rr_control.super = L2CAP_SUPER_RR;
6325 rr_control.reqseq = chan->buffer_seq;
6326 l2cap_send_sframe(chan, &rr_control);
6327 }
6328
6329 break;
6330 case L2CAP_EV_RECV_REJ:
6331 l2cap_handle_rej(chan, control);
6332 break;
6333 case L2CAP_EV_RECV_SREJ:
6334 l2cap_handle_srej(chan, control);
6335 break;
6336 }
6337
6338 if (skb && !skb_in_use) {
6339 BT_DBG("Freeing %p", skb);
6340 kfree_skb(skb);
6341 }
6342
6343 return err;
6344 }
6345
6346 static int l2cap_finish_move(struct l2cap_chan *chan)
6347 {
6348 BT_DBG("chan %p", chan);
6349
6350 chan->rx_state = L2CAP_RX_STATE_RECV;
6351
6352 if (chan->hs_hcon)
6353 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6354 else
6355 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6356
6357 return l2cap_resegment(chan);
6358 }
6359
6360 static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6361 struct l2cap_ctrl *control,
6362 struct sk_buff *skb, u8 event)
6363 {
6364 int err;
6365
6366 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6367 event);
6368
6369 if (!control->poll)
6370 return -EPROTO;
6371
6372 l2cap_process_reqseq(chan, control->reqseq);
6373
6374 if (!skb_queue_empty(&chan->tx_q))
6375 chan->tx_send_head = skb_peek(&chan->tx_q);
6376 else
6377 chan->tx_send_head = NULL;
6378
6379 /* Rewind next_tx_seq to the point expected
6380 * by the receiver.
6381 */
6382 chan->next_tx_seq = control->reqseq;
6383 chan->unacked_frames = 0;
6384
6385 err = l2cap_finish_move(chan);
6386 if (err)
6387 return err;
6388
6389 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6390 l2cap_send_i_or_rr_or_rnr(chan);
6391
6392 if (event == L2CAP_EV_RECV_IFRAME)
6393 return -EPROTO;
6394
6395 return l2cap_rx_state_recv(chan, control, NULL, event);
6396 }
6397
6398 static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6399 struct l2cap_ctrl *control,
6400 struct sk_buff *skb, u8 event)
6401 {
6402 int err;
6403
6404 if (!control->final)
6405 return -EPROTO;
6406
6407 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6408
6409 chan->rx_state = L2CAP_RX_STATE_RECV;
6410 l2cap_process_reqseq(chan, control->reqseq);
6411
6412 if (!skb_queue_empty(&chan->tx_q))
6413 chan->tx_send_head = skb_peek(&chan->tx_q);
6414 else
6415 chan->tx_send_head = NULL;
6416
6417 /* Rewind next_tx_seq to the point expected
6418 * by the receiver.
6419 */
6420 chan->next_tx_seq = control->reqseq;
6421 chan->unacked_frames = 0;
6422
6423 if (chan->hs_hcon)
6424 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6425 else
6426 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6427
6428 err = l2cap_resegment(chan);
6429
6430 if (!err)
6431 err = l2cap_rx_state_recv(chan, control, skb, event);
6432
6433 return err;
6434 }
6435
6436 static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6437 {
6438 /* Make sure reqseq is for a packet that has been sent but not acked */
6439 u16 unacked;
6440
6441 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6442 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6443 }
6444
6445 static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6446 struct sk_buff *skb, u8 event)
6447 {
6448 int err = 0;
6449
6450 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6451 control, skb, event, chan->rx_state);
6452
6453 if (__valid_reqseq(chan, control->reqseq)) {
6454 switch (chan->rx_state) {
6455 case L2CAP_RX_STATE_RECV:
6456 err = l2cap_rx_state_recv(chan, control, skb, event);
6457 break;
6458 case L2CAP_RX_STATE_SREJ_SENT:
6459 err = l2cap_rx_state_srej_sent(chan, control, skb,
6460 event);
6461 break;
6462 case L2CAP_RX_STATE_WAIT_P:
6463 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6464 break;
6465 case L2CAP_RX_STATE_WAIT_F:
6466 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6467 break;
6468 default:
6469 /* shut it down */
6470 break;
6471 }
6472 } else {
6473 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6474 control->reqseq, chan->next_tx_seq,
6475 chan->expected_ack_seq);
6476 l2cap_send_disconn_req(chan, ECONNRESET);
6477 }
6478
6479 return err;
6480 }
6481
6482 static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6483 struct sk_buff *skb)
6484 {
6485 int err = 0;
6486
6487 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6488 chan->rx_state);
6489
6490 if (l2cap_classify_txseq(chan, control->txseq) ==
6491 L2CAP_TXSEQ_EXPECTED) {
6492 l2cap_pass_to_tx(chan, control);
6493
6494 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6495 __next_seq(chan, chan->buffer_seq));
6496
6497 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6498
6499 l2cap_reassemble_sdu(chan, skb, control);
6500 } else {
6501 if (chan->sdu) {
6502 kfree_skb(chan->sdu);
6503 chan->sdu = NULL;
6504 }
6505 chan->sdu_last_frag = NULL;
6506 chan->sdu_len = 0;
6507
6508 if (skb) {
6509 BT_DBG("Freeing %p", skb);
6510 kfree_skb(skb);
6511 }
6512 }
6513
6514 chan->last_acked_seq = control->txseq;
6515 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6516
6517 return err;
6518 }
6519
6520 static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6521 {
6522 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6523 u16 len;
6524 u8 event;
6525
6526 __unpack_control(chan, skb);
6527
6528 len = skb->len;
6529
6530 /*
6531 * We can just drop the corrupted I-frame here.
6532 * Receiver will miss it and start proper recovery
6533 * procedures and ask for retransmission.
6534 */
6535 if (l2cap_check_fcs(chan, skb))
6536 goto drop;
6537
6538 if (!control->sframe && control->sar == L2CAP_SAR_START)
6539 len -= L2CAP_SDULEN_SIZE;
6540
6541 if (chan->fcs == L2CAP_FCS_CRC16)
6542 len -= L2CAP_FCS_SIZE;
6543
6544 if (len > chan->mps) {
6545 l2cap_send_disconn_req(chan, ECONNRESET);
6546 goto drop;
6547 }
6548
6549 if (!control->sframe) {
6550 int err;
6551
6552 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6553 control->sar, control->reqseq, control->final,
6554 control->txseq);
6555
6556 /* Validate F-bit - F=0 always valid, F=1 only
6557 * valid in TX WAIT_F
6558 */
6559 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
6560 goto drop;
6561
6562 if (chan->mode != L2CAP_MODE_STREAMING) {
6563 event = L2CAP_EV_RECV_IFRAME;
6564 err = l2cap_rx(chan, control, skb, event);
6565 } else {
6566 err = l2cap_stream_rx(chan, control, skb);
6567 }
6568
6569 if (err)
6570 l2cap_send_disconn_req(chan, ECONNRESET);
6571 } else {
6572 const u8 rx_func_to_event[4] = {
6573 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6574 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6575 };
6576
6577 /* Only I-frames are expected in streaming mode */
6578 if (chan->mode == L2CAP_MODE_STREAMING)
6579 goto drop;
6580
6581 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6582 control->reqseq, control->final, control->poll,
6583 control->super);
6584
6585 if (len != 0) {
6586 BT_ERR("Trailing bytes: %d in sframe", len);
6587 l2cap_send_disconn_req(chan, ECONNRESET);
6588 goto drop;
6589 }
6590
6591 /* Validate F and P bits */
6592 if (control->final && (control->poll ||
6593 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6594 goto drop;
6595
6596 event = rx_func_to_event[control->super];
6597 if (l2cap_rx(chan, control, skb, event))
6598 l2cap_send_disconn_req(chan, ECONNRESET);
6599 }
6600
6601 return 0;
6602
6603 drop:
6604 kfree_skb(skb);
6605 return 0;
6606 }
6607
6608 static void l2cap_chan_le_send_credits(struct l2cap_chan *chan)
6609 {
6610 struct l2cap_conn *conn = chan->conn;
6611 struct l2cap_le_credits pkt;
6612 u16 return_credits;
6613
6614 /* We return more credits to the sender only after the amount of
6615 * credits falls below half of the initial amount.
6616 */
6617 if (chan->rx_credits >= (le_max_credits + 1) / 2)
6618 return;
6619
6620 return_credits = le_max_credits - chan->rx_credits;
6621
6622 BT_DBG("chan %p returning %u credits to sender", chan, return_credits);
6623
6624 chan->rx_credits += return_credits;
6625
6626 pkt.cid = cpu_to_le16(chan->scid);
6627 pkt.credits = cpu_to_le16(return_credits);
6628
6629 chan->ident = l2cap_get_ident(conn);
6630
6631 l2cap_send_cmd(conn, chan->ident, L2CAP_LE_CREDITS, sizeof(pkt), &pkt);
6632 }
6633
6634 static int l2cap_le_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6635 {
6636 int err;
6637
6638 if (!chan->rx_credits) {
6639 BT_ERR("No credits to receive LE L2CAP data");
6640 l2cap_send_disconn_req(chan, ECONNRESET);
6641 return -ENOBUFS;
6642 }
6643
6644 if (chan->imtu < skb->len) {
6645 BT_ERR("Too big LE L2CAP PDU");
6646 return -ENOBUFS;
6647 }
6648
6649 chan->rx_credits--;
6650 BT_DBG("rx_credits %u -> %u", chan->rx_credits + 1, chan->rx_credits);
6651
6652 l2cap_chan_le_send_credits(chan);
6653
6654 err = 0;
6655
6656 if (!chan->sdu) {
6657 u16 sdu_len;
6658
6659 sdu_len = get_unaligned_le16(skb->data);
6660 skb_pull(skb, L2CAP_SDULEN_SIZE);
6661
6662 BT_DBG("Start of new SDU. sdu_len %u skb->len %u imtu %u",
6663 sdu_len, skb->len, chan->imtu);
6664
6665 if (sdu_len > chan->imtu) {
6666 BT_ERR("Too big LE L2CAP SDU length received");
6667 err = -EMSGSIZE;
6668 goto failed;
6669 }
6670
6671 if (skb->len > sdu_len) {
6672 BT_ERR("Too much LE L2CAP data received");
6673 err = -EINVAL;
6674 goto failed;
6675 }
6676
6677 if (skb->len == sdu_len)
6678 return chan->ops->recv(chan, skb);
6679
6680 chan->sdu = skb;
6681 chan->sdu_len = sdu_len;
6682 chan->sdu_last_frag = skb;
6683
6684 return 0;
6685 }
6686
6687 BT_DBG("SDU fragment. chan->sdu->len %u skb->len %u chan->sdu_len %u",
6688 chan->sdu->len, skb->len, chan->sdu_len);
6689
6690 if (chan->sdu->len + skb->len > chan->sdu_len) {
6691 BT_ERR("Too much LE L2CAP data received");
6692 err = -EINVAL;
6693 goto failed;
6694 }
6695
6696 append_skb_frag(chan->sdu, skb, &chan->sdu_last_frag);
6697 skb = NULL;
6698
6699 if (chan->sdu->len == chan->sdu_len) {
6700 err = chan->ops->recv(chan, chan->sdu);
6701 if (!err) {
6702 chan->sdu = NULL;
6703 chan->sdu_last_frag = NULL;
6704 chan->sdu_len = 0;
6705 }
6706 }
6707
6708 failed:
6709 if (err) {
6710 kfree_skb(skb);
6711 kfree_skb(chan->sdu);
6712 chan->sdu = NULL;
6713 chan->sdu_last_frag = NULL;
6714 chan->sdu_len = 0;
6715 }
6716
6717 /* We can't return an error here since we took care of the skb
6718 * freeing internally. An error return would cause the caller to
6719 * do a double-free of the skb.
6720 */
6721 return 0;
6722 }
6723
6724 static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6725 struct sk_buff *skb)
6726 {
6727 struct l2cap_chan *chan;
6728
6729 chan = l2cap_get_chan_by_scid(conn, cid);
6730 if (!chan) {
6731 if (cid == L2CAP_CID_A2MP) {
6732 chan = a2mp_channel_create(conn, skb);
6733 if (!chan) {
6734 kfree_skb(skb);
6735 return;
6736 }
6737
6738 l2cap_chan_lock(chan);
6739 } else {
6740 BT_DBG("unknown cid 0x%4.4x", cid);
6741 /* Drop packet and return */
6742 kfree_skb(skb);
6743 return;
6744 }
6745 }
6746
6747 BT_DBG("chan %p, len %d", chan, skb->len);
6748
6749 if (chan->state != BT_CONNECTED)
6750 goto drop;
6751
6752 switch (chan->mode) {
6753 case L2CAP_MODE_LE_FLOWCTL:
6754 if (l2cap_le_data_rcv(chan, skb) < 0)
6755 goto drop;
6756
6757 goto done;
6758
6759 case L2CAP_MODE_BASIC:
6760 /* If socket recv buffers overflows we drop data here
6761 * which is *bad* because L2CAP has to be reliable.
6762 * But we don't have any other choice. L2CAP doesn't
6763 * provide flow control mechanism. */
6764
6765 if (chan->imtu < skb->len) {
6766 BT_ERR("Dropping L2CAP data: receive buffer overflow");
6767 goto drop;
6768 }
6769
6770 if (!chan->ops->recv(chan, skb))
6771 goto done;
6772 break;
6773
6774 case L2CAP_MODE_ERTM:
6775 case L2CAP_MODE_STREAMING:
6776 l2cap_data_rcv(chan, skb);
6777 goto done;
6778
6779 default:
6780 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
6781 break;
6782 }
6783
6784 drop:
6785 kfree_skb(skb);
6786
6787 done:
6788 l2cap_chan_unlock(chan);
6789 }
6790
6791 static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6792 struct sk_buff *skb)
6793 {
6794 struct hci_conn *hcon = conn->hcon;
6795 struct l2cap_chan *chan;
6796
6797 if (hcon->type != ACL_LINK)
6798 goto free_skb;
6799
6800 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst,
6801 ACL_LINK);
6802 if (!chan)
6803 goto free_skb;
6804
6805 BT_DBG("chan %p, len %d", chan, skb->len);
6806
6807 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
6808 goto drop;
6809
6810 if (chan->imtu < skb->len)
6811 goto drop;
6812
6813 /* Store remote BD_ADDR and PSM for msg_name */
6814 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
6815 bt_cb(skb)->psm = psm;
6816
6817 if (!chan->ops->recv(chan, skb)) {
6818 l2cap_chan_put(chan);
6819 return;
6820 }
6821
6822 drop:
6823 l2cap_chan_put(chan);
6824 free_skb:
6825 kfree_skb(skb);
6826 }
6827
6828 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6829 {
6830 struct l2cap_hdr *lh = (void *) skb->data;
6831 struct hci_conn *hcon = conn->hcon;
6832 u16 cid, len;
6833 __le16 psm;
6834
6835 if (hcon->state != BT_CONNECTED) {
6836 BT_DBG("queueing pending rx skb");
6837 skb_queue_tail(&conn->pending_rx, skb);
6838 return;
6839 }
6840
6841 skb_pull(skb, L2CAP_HDR_SIZE);
6842 cid = __le16_to_cpu(lh->cid);
6843 len = __le16_to_cpu(lh->len);
6844
6845 if (len != skb->len) {
6846 kfree_skb(skb);
6847 return;
6848 }
6849
6850 /* Since we can't actively block incoming LE connections we must
6851 * at least ensure that we ignore incoming data from them.
6852 */
6853 if (hcon->type == LE_LINK &&
6854 hci_bdaddr_list_lookup(&hcon->hdev->blacklist, &hcon->dst,
6855 bdaddr_type(hcon, hcon->dst_type))) {
6856 kfree_skb(skb);
6857 return;
6858 }
6859
6860 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6861
6862 switch (cid) {
6863 case L2CAP_CID_SIGNALING:
6864 l2cap_sig_channel(conn, skb);
6865 break;
6866
6867 case L2CAP_CID_CONN_LESS:
6868 psm = get_unaligned((__le16 *) skb->data);
6869 skb_pull(skb, L2CAP_PSMLEN_SIZE);
6870 l2cap_conless_channel(conn, psm, skb);
6871 break;
6872
6873 case L2CAP_CID_LE_SIGNALING:
6874 l2cap_le_sig_channel(conn, skb);
6875 break;
6876
6877 default:
6878 l2cap_data_channel(conn, cid, skb);
6879 break;
6880 }
6881 }
6882
6883 static void process_pending_rx(struct work_struct *work)
6884 {
6885 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
6886 pending_rx_work);
6887 struct sk_buff *skb;
6888
6889 BT_DBG("");
6890
6891 while ((skb = skb_dequeue(&conn->pending_rx)))
6892 l2cap_recv_frame(conn, skb);
6893 }
6894
6895 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
6896 {
6897 struct l2cap_conn *conn = hcon->l2cap_data;
6898 struct hci_chan *hchan;
6899
6900 if (conn)
6901 return conn;
6902
6903 hchan = hci_chan_create(hcon);
6904 if (!hchan)
6905 return NULL;
6906
6907 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
6908 if (!conn) {
6909 hci_chan_del(hchan);
6910 return NULL;
6911 }
6912
6913 kref_init(&conn->ref);
6914 hcon->l2cap_data = conn;
6915 conn->hcon = hci_conn_get(hcon);
6916 conn->hchan = hchan;
6917
6918 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
6919
6920 switch (hcon->type) {
6921 case LE_LINK:
6922 if (hcon->hdev->le_mtu) {
6923 conn->mtu = hcon->hdev->le_mtu;
6924 break;
6925 }
6926 /* fall through */
6927 default:
6928 conn->mtu = hcon->hdev->acl_mtu;
6929 break;
6930 }
6931
6932 conn->feat_mask = 0;
6933
6934 if (hcon->type == ACL_LINK)
6935 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
6936 &hcon->hdev->dev_flags);
6937
6938 mutex_init(&conn->ident_lock);
6939 mutex_init(&conn->chan_lock);
6940
6941 INIT_LIST_HEAD(&conn->chan_l);
6942 INIT_LIST_HEAD(&conn->users);
6943
6944 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
6945
6946 skb_queue_head_init(&conn->pending_rx);
6947 INIT_WORK(&conn->pending_rx_work, process_pending_rx);
6948 INIT_WORK(&conn->id_addr_update_work, l2cap_conn_update_id_addr);
6949
6950 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
6951
6952 return conn;
6953 }
6954
6955 static bool is_valid_psm(u16 psm, u8 dst_type) {
6956 if (!psm)
6957 return false;
6958
6959 if (bdaddr_type_is_le(dst_type))
6960 return (psm <= 0x00ff);
6961
6962 /* PSM must be odd and lsb of upper byte must be 0 */
6963 return ((psm & 0x0101) == 0x0001);
6964 }
6965
6966 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
6967 bdaddr_t *dst, u8 dst_type)
6968 {
6969 struct l2cap_conn *conn;
6970 struct hci_conn *hcon;
6971 struct hci_dev *hdev;
6972 int err;
6973
6974 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
6975 dst_type, __le16_to_cpu(psm));
6976
6977 hdev = hci_get_route(dst, &chan->src);
6978 if (!hdev)
6979 return -EHOSTUNREACH;
6980
6981 hci_dev_lock(hdev);
6982
6983 if (!is_valid_psm(__le16_to_cpu(psm), dst_type) && !cid &&
6984 chan->chan_type != L2CAP_CHAN_RAW) {
6985 err = -EINVAL;
6986 goto done;
6987 }
6988
6989 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !psm) {
6990 err = -EINVAL;
6991 goto done;
6992 }
6993
6994 if (chan->chan_type == L2CAP_CHAN_FIXED && !cid) {
6995 err = -EINVAL;
6996 goto done;
6997 }
6998
6999 switch (chan->mode) {
7000 case L2CAP_MODE_BASIC:
7001 break;
7002 case L2CAP_MODE_LE_FLOWCTL:
7003 l2cap_le_flowctl_init(chan);
7004 break;
7005 case L2CAP_MODE_ERTM:
7006 case L2CAP_MODE_STREAMING:
7007 if (!disable_ertm)
7008 break;
7009 /* fall through */
7010 default:
7011 err = -EOPNOTSUPP;
7012 goto done;
7013 }
7014
7015 switch (chan->state) {
7016 case BT_CONNECT:
7017 case BT_CONNECT2:
7018 case BT_CONFIG:
7019 /* Already connecting */
7020 err = 0;
7021 goto done;
7022
7023 case BT_CONNECTED:
7024 /* Already connected */
7025 err = -EISCONN;
7026 goto done;
7027
7028 case BT_OPEN:
7029 case BT_BOUND:
7030 /* Can connect */
7031 break;
7032
7033 default:
7034 err = -EBADFD;
7035 goto done;
7036 }
7037
7038 /* Set destination address and psm */
7039 bacpy(&chan->dst, dst);
7040 chan->dst_type = dst_type;
7041
7042 chan->psm = psm;
7043 chan->dcid = cid;
7044
7045 if (bdaddr_type_is_le(dst_type)) {
7046 u8 role;
7047
7048 /* Convert from L2CAP channel address type to HCI address type
7049 */
7050 if (dst_type == BDADDR_LE_PUBLIC)
7051 dst_type = ADDR_LE_DEV_PUBLIC;
7052 else
7053 dst_type = ADDR_LE_DEV_RANDOM;
7054
7055 if (test_bit(HCI_ADVERTISING, &hdev->dev_flags))
7056 role = HCI_ROLE_SLAVE;
7057 else
7058 role = HCI_ROLE_MASTER;
7059
7060 hcon = hci_connect_le(hdev, dst, dst_type, chan->sec_level,
7061 HCI_LE_CONN_TIMEOUT, role);
7062 } else {
7063 u8 auth_type = l2cap_get_auth_type(chan);
7064 hcon = hci_connect_acl(hdev, dst, chan->sec_level, auth_type);
7065 }
7066
7067 if (IS_ERR(hcon)) {
7068 err = PTR_ERR(hcon);
7069 goto done;
7070 }
7071
7072 conn = l2cap_conn_add(hcon);
7073 if (!conn) {
7074 hci_conn_drop(hcon);
7075 err = -ENOMEM;
7076 goto done;
7077 }
7078
7079 mutex_lock(&conn->chan_lock);
7080 l2cap_chan_lock(chan);
7081
7082 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
7083 hci_conn_drop(hcon);
7084 err = -EBUSY;
7085 goto chan_unlock;
7086 }
7087
7088 /* Update source addr of the socket */
7089 bacpy(&chan->src, &hcon->src);
7090 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7091
7092 __l2cap_chan_add(conn, chan);
7093
7094 /* l2cap_chan_add takes its own ref so we can drop this one */
7095 hci_conn_drop(hcon);
7096
7097 l2cap_state_change(chan, BT_CONNECT);
7098 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
7099
7100 /* Release chan->sport so that it can be reused by other
7101 * sockets (as it's only used for listening sockets).
7102 */
7103 write_lock(&chan_list_lock);
7104 chan->sport = 0;
7105 write_unlock(&chan_list_lock);
7106
7107 if (hcon->state == BT_CONNECTED) {
7108 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
7109 __clear_chan_timer(chan);
7110 if (l2cap_chan_check_security(chan, true))
7111 l2cap_state_change(chan, BT_CONNECTED);
7112 } else
7113 l2cap_do_start(chan);
7114 }
7115
7116 err = 0;
7117
7118 chan_unlock:
7119 l2cap_chan_unlock(chan);
7120 mutex_unlock(&conn->chan_lock);
7121 done:
7122 hci_dev_unlock(hdev);
7123 hci_dev_put(hdev);
7124 return err;
7125 }
7126 EXPORT_SYMBOL_GPL(l2cap_chan_connect);
7127
7128 /* ---- L2CAP interface with lower layer (HCI) ---- */
7129
7130 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
7131 {
7132 int exact = 0, lm1 = 0, lm2 = 0;
7133 struct l2cap_chan *c;
7134
7135 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
7136
7137 /* Find listening sockets and check their link_mode */
7138 read_lock(&chan_list_lock);
7139 list_for_each_entry(c, &chan_list, global_l) {
7140 if (c->state != BT_LISTEN)
7141 continue;
7142
7143 if (!bacmp(&c->src, &hdev->bdaddr)) {
7144 lm1 |= HCI_LM_ACCEPT;
7145 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
7146 lm1 |= HCI_LM_MASTER;
7147 exact++;
7148 } else if (!bacmp(&c->src, BDADDR_ANY)) {
7149 lm2 |= HCI_LM_ACCEPT;
7150 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
7151 lm2 |= HCI_LM_MASTER;
7152 }
7153 }
7154 read_unlock(&chan_list_lock);
7155
7156 return exact ? lm1 : lm2;
7157 }
7158
7159 /* Find the next fixed channel in BT_LISTEN state, continue iteration
7160 * from an existing channel in the list or from the beginning of the
7161 * global list (by passing NULL as first parameter).
7162 */
7163 static struct l2cap_chan *l2cap_global_fixed_chan(struct l2cap_chan *c,
7164 bdaddr_t *src, u8 link_type)
7165 {
7166 read_lock(&chan_list_lock);
7167
7168 if (c)
7169 c = list_next_entry(c, global_l);
7170 else
7171 c = list_entry(chan_list.next, typeof(*c), global_l);
7172
7173 list_for_each_entry_from(c, &chan_list, global_l) {
7174 if (c->chan_type != L2CAP_CHAN_FIXED)
7175 continue;
7176 if (c->state != BT_LISTEN)
7177 continue;
7178 if (bacmp(&c->src, src) && bacmp(&c->src, BDADDR_ANY))
7179 continue;
7180 if (link_type == ACL_LINK && c->src_type != BDADDR_BREDR)
7181 continue;
7182 if (link_type == LE_LINK && c->src_type == BDADDR_BREDR)
7183 continue;
7184
7185 l2cap_chan_hold(c);
7186 read_unlock(&chan_list_lock);
7187 return c;
7188 }
7189
7190 read_unlock(&chan_list_lock);
7191
7192 return NULL;
7193 }
7194
7195 void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
7196 {
7197 struct hci_dev *hdev = hcon->hdev;
7198 struct l2cap_conn *conn;
7199 struct l2cap_chan *pchan;
7200 u8 dst_type;
7201
7202 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
7203
7204 if (status) {
7205 l2cap_conn_del(hcon, bt_to_errno(status));
7206 return;
7207 }
7208
7209 conn = l2cap_conn_add(hcon);
7210 if (!conn)
7211 return;
7212
7213 dst_type = bdaddr_type(hcon, hcon->dst_type);
7214
7215 /* If device is blocked, do not create channels for it */
7216 if (hci_bdaddr_list_lookup(&hdev->blacklist, &hcon->dst, dst_type))
7217 return;
7218
7219 /* Find fixed channels and notify them of the new connection. We
7220 * use multiple individual lookups, continuing each time where
7221 * we left off, because the list lock would prevent calling the
7222 * potentially sleeping l2cap_chan_lock() function.
7223 */
7224 pchan = l2cap_global_fixed_chan(NULL, &hdev->bdaddr, hcon->type);
7225 while (pchan) {
7226 struct l2cap_chan *chan, *next;
7227
7228 /* Client fixed channels should override server ones */
7229 if (__l2cap_get_chan_by_dcid(conn, pchan->scid))
7230 goto next;
7231
7232 l2cap_chan_lock(pchan);
7233 chan = pchan->ops->new_connection(pchan);
7234 if (chan) {
7235 bacpy(&chan->src, &hcon->src);
7236 bacpy(&chan->dst, &hcon->dst);
7237 chan->src_type = bdaddr_type(hcon, hcon->src_type);
7238 chan->dst_type = dst_type;
7239
7240 __l2cap_chan_add(conn, chan);
7241 }
7242
7243 l2cap_chan_unlock(pchan);
7244 next:
7245 next = l2cap_global_fixed_chan(pchan, &hdev->bdaddr,
7246 hcon->type);
7247 l2cap_chan_put(pchan);
7248 pchan = next;
7249 }
7250
7251 l2cap_conn_ready(conn);
7252 }
7253
7254 int l2cap_disconn_ind(struct hci_conn *hcon)
7255 {
7256 struct l2cap_conn *conn = hcon->l2cap_data;
7257
7258 BT_DBG("hcon %p", hcon);
7259
7260 if (!conn)
7261 return HCI_ERROR_REMOTE_USER_TERM;
7262 return conn->disc_reason;
7263 }
7264
7265 void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
7266 {
7267 BT_DBG("hcon %p reason %d", hcon, reason);
7268
7269 l2cap_conn_del(hcon, bt_to_errno(reason));
7270 }
7271
7272 static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
7273 {
7274 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
7275 return;
7276
7277 if (encrypt == 0x00) {
7278 if (chan->sec_level == BT_SECURITY_MEDIUM) {
7279 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
7280 } else if (chan->sec_level == BT_SECURITY_HIGH ||
7281 chan->sec_level == BT_SECURITY_FIPS)
7282 l2cap_chan_close(chan, ECONNREFUSED);
7283 } else {
7284 if (chan->sec_level == BT_SECURITY_MEDIUM)
7285 __clear_chan_timer(chan);
7286 }
7287 }
7288
7289 int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
7290 {
7291 struct l2cap_conn *conn = hcon->l2cap_data;
7292 struct l2cap_chan *chan;
7293
7294 if (!conn)
7295 return 0;
7296
7297 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
7298
7299 mutex_lock(&conn->chan_lock);
7300
7301 list_for_each_entry(chan, &conn->chan_l, list) {
7302 l2cap_chan_lock(chan);
7303
7304 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
7305 state_to_string(chan->state));
7306
7307 if (chan->scid == L2CAP_CID_A2MP) {
7308 l2cap_chan_unlock(chan);
7309 continue;
7310 }
7311
7312 if (!status && encrypt)
7313 chan->sec_level = hcon->sec_level;
7314
7315 if (!__l2cap_no_conn_pending(chan)) {
7316 l2cap_chan_unlock(chan);
7317 continue;
7318 }
7319
7320 if (!status && (chan->state == BT_CONNECTED ||
7321 chan->state == BT_CONFIG)) {
7322 chan->ops->resume(chan);
7323 l2cap_check_encryption(chan, encrypt);
7324 l2cap_chan_unlock(chan);
7325 continue;
7326 }
7327
7328 if (chan->state == BT_CONNECT) {
7329 if (!status)
7330 l2cap_start_connection(chan);
7331 else
7332 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
7333 } else if (chan->state == BT_CONNECT2) {
7334 struct l2cap_conn_rsp rsp;
7335 __u16 res, stat;
7336
7337 if (!status) {
7338 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
7339 res = L2CAP_CR_PEND;
7340 stat = L2CAP_CS_AUTHOR_PEND;
7341 chan->ops->defer(chan);
7342 } else {
7343 l2cap_state_change(chan, BT_CONFIG);
7344 res = L2CAP_CR_SUCCESS;
7345 stat = L2CAP_CS_NO_INFO;
7346 }
7347 } else {
7348 l2cap_state_change(chan, BT_DISCONN);
7349 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
7350 res = L2CAP_CR_SEC_BLOCK;
7351 stat = L2CAP_CS_NO_INFO;
7352 }
7353
7354 rsp.scid = cpu_to_le16(chan->dcid);
7355 rsp.dcid = cpu_to_le16(chan->scid);
7356 rsp.result = cpu_to_le16(res);
7357 rsp.status = cpu_to_le16(stat);
7358 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
7359 sizeof(rsp), &rsp);
7360
7361 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
7362 res == L2CAP_CR_SUCCESS) {
7363 char buf[128];
7364 set_bit(CONF_REQ_SENT, &chan->conf_state);
7365 l2cap_send_cmd(conn, l2cap_get_ident(conn),
7366 L2CAP_CONF_REQ,
7367 l2cap_build_conf_req(chan, buf),
7368 buf);
7369 chan->num_conf_req++;
7370 }
7371 }
7372
7373 l2cap_chan_unlock(chan);
7374 }
7375
7376 mutex_unlock(&conn->chan_lock);
7377
7378 return 0;
7379 }
7380
7381 int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
7382 {
7383 struct l2cap_conn *conn = hcon->l2cap_data;
7384 struct l2cap_hdr *hdr;
7385 int len;
7386
7387 /* For AMP controller do not create l2cap conn */
7388 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
7389 goto drop;
7390
7391 if (!conn)
7392 conn = l2cap_conn_add(hcon);
7393
7394 if (!conn)
7395 goto drop;
7396
7397 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
7398
7399 switch (flags) {
7400 case ACL_START:
7401 case ACL_START_NO_FLUSH:
7402 case ACL_COMPLETE:
7403 if (conn->rx_len) {
7404 BT_ERR("Unexpected start frame (len %d)", skb->len);
7405 kfree_skb(conn->rx_skb);
7406 conn->rx_skb = NULL;
7407 conn->rx_len = 0;
7408 l2cap_conn_unreliable(conn, ECOMM);
7409 }
7410
7411 /* Start fragment always begin with Basic L2CAP header */
7412 if (skb->len < L2CAP_HDR_SIZE) {
7413 BT_ERR("Frame is too short (len %d)", skb->len);
7414 l2cap_conn_unreliable(conn, ECOMM);
7415 goto drop;
7416 }
7417
7418 hdr = (struct l2cap_hdr *) skb->data;
7419 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
7420
7421 if (len == skb->len) {
7422 /* Complete frame received */
7423 l2cap_recv_frame(conn, skb);
7424 return 0;
7425 }
7426
7427 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
7428
7429 if (skb->len > len) {
7430 BT_ERR("Frame is too long (len %d, expected len %d)",
7431 skb->len, len);
7432 l2cap_conn_unreliable(conn, ECOMM);
7433 goto drop;
7434 }
7435
7436 /* Allocate skb for the complete frame (with header) */
7437 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
7438 if (!conn->rx_skb)
7439 goto drop;
7440
7441 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
7442 skb->len);
7443 conn->rx_len = len - skb->len;
7444 break;
7445
7446 case ACL_CONT:
7447 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
7448
7449 if (!conn->rx_len) {
7450 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
7451 l2cap_conn_unreliable(conn, ECOMM);
7452 goto drop;
7453 }
7454
7455 if (skb->len > conn->rx_len) {
7456 BT_ERR("Fragment is too long (len %d, expected %d)",
7457 skb->len, conn->rx_len);
7458 kfree_skb(conn->rx_skb);
7459 conn->rx_skb = NULL;
7460 conn->rx_len = 0;
7461 l2cap_conn_unreliable(conn, ECOMM);
7462 goto drop;
7463 }
7464
7465 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
7466 skb->len);
7467 conn->rx_len -= skb->len;
7468
7469 if (!conn->rx_len) {
7470 /* Complete frame received. l2cap_recv_frame
7471 * takes ownership of the skb so set the global
7472 * rx_skb pointer to NULL first.
7473 */
7474 struct sk_buff *rx_skb = conn->rx_skb;
7475 conn->rx_skb = NULL;
7476 l2cap_recv_frame(conn, rx_skb);
7477 }
7478 break;
7479 }
7480
7481 drop:
7482 kfree_skb(skb);
7483 return 0;
7484 }
7485
7486 static int l2cap_debugfs_show(struct seq_file *f, void *p)
7487 {
7488 struct l2cap_chan *c;
7489
7490 read_lock(&chan_list_lock);
7491
7492 list_for_each_entry(c, &chan_list, global_l) {
7493 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
7494 &c->src, &c->dst,
7495 c->state, __le16_to_cpu(c->psm),
7496 c->scid, c->dcid, c->imtu, c->omtu,
7497 c->sec_level, c->mode);
7498 }
7499
7500 read_unlock(&chan_list_lock);
7501
7502 return 0;
7503 }
7504
7505 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
7506 {
7507 return single_open(file, l2cap_debugfs_show, inode->i_private);
7508 }
7509
7510 static const struct file_operations l2cap_debugfs_fops = {
7511 .open = l2cap_debugfs_open,
7512 .read = seq_read,
7513 .llseek = seq_lseek,
7514 .release = single_release,
7515 };
7516
7517 static struct dentry *l2cap_debugfs;
7518
7519 int __init l2cap_init(void)
7520 {
7521 int err;
7522
7523 err = l2cap_init_sockets();
7524 if (err < 0)
7525 return err;
7526
7527 if (IS_ERR_OR_NULL(bt_debugfs))
7528 return 0;
7529
7530 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
7531 NULL, &l2cap_debugfs_fops);
7532
7533 debugfs_create_u16("l2cap_le_max_credits", 0644, bt_debugfs,
7534 &le_max_credits);
7535 debugfs_create_u16("l2cap_le_default_mps", 0644, bt_debugfs,
7536 &le_default_mps);
7537
7538 return 0;
7539 }
7540
7541 void l2cap_exit(void)
7542 {
7543 debugfs_remove(l2cap_debugfs);
7544 l2cap_cleanup_sockets();
7545 }
7546
7547 module_param(disable_ertm, bool, 0644);
7548 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
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