?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / net / bluetooth / l2cap_core.c
blob4af3821df880f70dd17cd36161eff766c3e49334
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 bool disable_ertm;
45
46 static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN | L2CAP_FEAT_UCD;
47 static u8 l2cap_fixed_chan[8] = { L2CAP_FC_L2CAP | L2CAP_FC_CONNLESS, };
48
49 static LIST_HEAD(chan_list);
50 static DEFINE_RWLOCK(chan_list_lock);
51
52 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn,
53 u8 code, u8 ident, u16 dlen, void *data);
54 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
55 void *data);
56 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data);
57 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err);
58
59 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
60 struct sk_buff_head *skbs, u8 event);
61
62 static inline __u8 bdaddr_type(struct hci_conn *hcon, __u8 type)
63 {
64 if (hcon->type == LE_LINK) {
65 if (type == ADDR_LE_DEV_PUBLIC)
66 return BDADDR_LE_PUBLIC;
67 else
68 return BDADDR_LE_RANDOM;
69 }
70
71 return BDADDR_BREDR;
72 }
73
74 /* ---- L2CAP channels ---- */
75
76 static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
77 u16 cid)
78 {
79 struct l2cap_chan *c;
80
81 list_for_each_entry(c, &conn->chan_l, list) {
82 if (c->dcid == cid)
83 return c;
84 }
85 return NULL;
86 }
87
88 static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn,
89 u16 cid)
90 {
91 struct l2cap_chan *c;
92
93 list_for_each_entry(c, &conn->chan_l, list) {
94 if (c->scid == cid)
95 return c;
96 }
97 return NULL;
98 }
99
100 /* Find channel with given SCID.
101 * Returns locked channel. */
102 static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn,
103 u16 cid)
104 {
105 struct l2cap_chan *c;
106
107 mutex_lock(&conn->chan_lock);
108 c = __l2cap_get_chan_by_scid(conn, cid);
109 if (c)
110 l2cap_chan_lock(c);
111 mutex_unlock(&conn->chan_lock);
112
113 return c;
114 }
115
116 /* Find channel with given DCID.
117 * Returns locked channel.
118 */
119 static struct l2cap_chan *l2cap_get_chan_by_dcid(struct l2cap_conn *conn,
120 u16 cid)
121 {
122 struct l2cap_chan *c;
123
124 mutex_lock(&conn->chan_lock);
125 c = __l2cap_get_chan_by_dcid(conn, cid);
126 if (c)
127 l2cap_chan_lock(c);
128 mutex_unlock(&conn->chan_lock);
129
130 return c;
131 }
132
133 static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn,
134 u8 ident)
135 {
136 struct l2cap_chan *c;
137
138 list_for_each_entry(c, &conn->chan_l, list) {
139 if (c->ident == ident)
140 return c;
141 }
142 return NULL;
143 }
144
145 static struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn,
146 u8 ident)
147 {
148 struct l2cap_chan *c;
149
150 mutex_lock(&conn->chan_lock);
151 c = __l2cap_get_chan_by_ident(conn, ident);
152 if (c)
153 l2cap_chan_lock(c);
154 mutex_unlock(&conn->chan_lock);
155
156 return c;
157 }
158
159 static struct l2cap_chan *__l2cap_global_chan_by_addr(__le16 psm, bdaddr_t *src)
160 {
161 struct l2cap_chan *c;
162
163 list_for_each_entry(c, &chan_list, global_l) {
164 if (c->sport == psm && !bacmp(&c->src, src))
165 return c;
166 }
167 return NULL;
168 }
169
170 int l2cap_add_psm(struct l2cap_chan *chan, bdaddr_t *src, __le16 psm)
171 {
172 int err;
173
174 write_lock(&chan_list_lock);
175
176 if (psm && __l2cap_global_chan_by_addr(psm, src)) {
177 err = -EADDRINUSE;
178 goto done;
179 }
180
181 if (psm) {
182 chan->psm = psm;
183 chan->sport = psm;
184 err = 0;
185 } else {
186 u16 p;
187
188 err = -EINVAL;
189 for (p = 0x1001; p < 0x1100; p += 2)
190 if (!__l2cap_global_chan_by_addr(cpu_to_le16(p), src)) {
191 chan->psm = cpu_to_le16(p);
192 chan->sport = cpu_to_le16(p);
193 err = 0;
194 break;
195 }
196 }
197
198 done:
199 write_unlock(&chan_list_lock);
200 return err;
201 }
202
203 int l2cap_add_scid(struct l2cap_chan *chan, __u16 scid)
204 {
205 write_lock(&chan_list_lock);
206
207 chan->scid = scid;
208
209 write_unlock(&chan_list_lock);
210
211 return 0;
212 }
213
214 static u16 l2cap_alloc_cid(struct l2cap_conn *conn)
215 {
216 u16 cid = L2CAP_CID_DYN_START;
217
218 for (; cid < L2CAP_CID_DYN_END; cid++) {
219 if (!__l2cap_get_chan_by_scid(conn, cid))
220 return cid;
221 }
222
223 return 0;
224 }
225
226 static void l2cap_state_change(struct l2cap_chan *chan, int state)
227 {
228 BT_DBG("chan %p %s -> %s", chan, state_to_string(chan->state),
229 state_to_string(state));
230
231 chan->state = state;
232 chan->ops->state_change(chan, state, 0);
233 }
234
235 static inline void l2cap_state_change_and_error(struct l2cap_chan *chan,
236 int state, int err)
237 {
238 chan->state = state;
239 chan->ops->state_change(chan, chan->state, err);
240 }
241
242 static inline void l2cap_chan_set_err(struct l2cap_chan *chan, int err)
243 {
244 chan->ops->state_change(chan, chan->state, err);
245 }
246
247 static void __set_retrans_timer(struct l2cap_chan *chan)
248 {
249 if (!delayed_work_pending(&chan->monitor_timer) &&
250 chan->retrans_timeout) {
251 l2cap_set_timer(chan, &chan->retrans_timer,
252 msecs_to_jiffies(chan->retrans_timeout));
253 }
254 }
255
256 static void __set_monitor_timer(struct l2cap_chan *chan)
257 {
258 __clear_retrans_timer(chan);
259 if (chan->monitor_timeout) {
260 l2cap_set_timer(chan, &chan->monitor_timer,
261 msecs_to_jiffies(chan->monitor_timeout));
262 }
263 }
264
265 static struct sk_buff *l2cap_ertm_seq_in_queue(struct sk_buff_head *head,
266 u16 seq)
267 {
268 struct sk_buff *skb;
269
270 skb_queue_walk(head, skb) {
271 if (bt_cb(skb)->control.txseq == seq)
272 return skb;
273 }
274
275 return NULL;
276 }
277
278 /* ---- L2CAP sequence number lists ---- */
279
280 /* For ERTM, ordered lists of sequence numbers must be tracked for
281 * SREJ requests that are received and for frames that are to be
282 * retransmitted. These seq_list functions implement a singly-linked
283 * list in an array, where membership in the list can also be checked
284 * in constant time. Items can also be added to the tail of the list
285 * and removed from the head in constant time, without further memory
286 * allocs or frees.
287 */
288
289 static int l2cap_seq_list_init(struct l2cap_seq_list *seq_list, u16 size)
290 {
291 size_t alloc_size, i;
292
293 /* Allocated size is a power of 2 to map sequence numbers
294 * (which may be up to 14 bits) in to a smaller array that is
295 * sized for the negotiated ERTM transmit windows.
296 */
297 alloc_size = roundup_pow_of_two(size);
298
299 seq_list->list = kmalloc(sizeof(u16) * alloc_size, GFP_KERNEL);
300 if (!seq_list->list)
301 return -ENOMEM;
302
303 seq_list->mask = alloc_size - 1;
304 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
305 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
306 for (i = 0; i < alloc_size; i++)
307 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
308
309 return 0;
310 }
311
312 static inline void l2cap_seq_list_free(struct l2cap_seq_list *seq_list)
313 {
314 kfree(seq_list->list);
315 }
316
317 static inline bool l2cap_seq_list_contains(struct l2cap_seq_list *seq_list,
318 u16 seq)
319 {
320 /* Constant-time check for list membership */
321 return seq_list->list[seq & seq_list->mask] != L2CAP_SEQ_LIST_CLEAR;
322 }
323
324 static u16 l2cap_seq_list_remove(struct l2cap_seq_list *seq_list, u16 seq)
325 {
326 u16 mask = seq_list->mask;
327
328 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR) {
329 /* In case someone tries to pop the head of an empty list */
330 return L2CAP_SEQ_LIST_CLEAR;
331 } else if (seq_list->head == seq) {
332 /* Head can be removed in constant time */
333 seq_list->head = seq_list->list[seq & mask];
334 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
335
336 if (seq_list->head == L2CAP_SEQ_LIST_TAIL) {
337 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
338 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
339 }
340 } else {
341 /* Walk the list to find the sequence number */
342 u16 prev = seq_list->head;
343 while (seq_list->list[prev & mask] != seq) {
344 prev = seq_list->list[prev & mask];
345 if (prev == L2CAP_SEQ_LIST_TAIL)
346 return L2CAP_SEQ_LIST_CLEAR;
347 }
348
349 /* Unlink the number from the list and clear it */
350 seq_list->list[prev & mask] = seq_list->list[seq & mask];
351 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_CLEAR;
352 if (seq_list->tail == seq)
353 seq_list->tail = prev;
354 }
355 return seq;
356 }
357
358 static inline u16 l2cap_seq_list_pop(struct l2cap_seq_list *seq_list)
359 {
360 /* Remove the head in constant time */
361 return l2cap_seq_list_remove(seq_list, seq_list->head);
362 }
363
364 static void l2cap_seq_list_clear(struct l2cap_seq_list *seq_list)
365 {
366 u16 i;
367
368 if (seq_list->head == L2CAP_SEQ_LIST_CLEAR)
369 return;
370
371 for (i = 0; i <= seq_list->mask; i++)
372 seq_list->list[i] = L2CAP_SEQ_LIST_CLEAR;
373
374 seq_list->head = L2CAP_SEQ_LIST_CLEAR;
375 seq_list->tail = L2CAP_SEQ_LIST_CLEAR;
376 }
377
378 static void l2cap_seq_list_append(struct l2cap_seq_list *seq_list, u16 seq)
379 {
380 u16 mask = seq_list->mask;
381
382 /* All appends happen in constant time */
383
384 if (seq_list->list[seq & mask] != L2CAP_SEQ_LIST_CLEAR)
385 return;
386
387 if (seq_list->tail == L2CAP_SEQ_LIST_CLEAR)
388 seq_list->head = seq;
389 else
390 seq_list->list[seq_list->tail & mask] = seq;
391
392 seq_list->tail = seq;
393 seq_list->list[seq & mask] = L2CAP_SEQ_LIST_TAIL;
394 }
395
396 static void l2cap_chan_timeout(struct work_struct *work)
397 {
398 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
399 chan_timer.work);
400 struct l2cap_conn *conn = chan->conn;
401 int reason;
402
403 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
404
405 mutex_lock(&conn->chan_lock);
406 l2cap_chan_lock(chan);
407
408 if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
409 reason = ECONNREFUSED;
410 else if (chan->state == BT_CONNECT &&
411 chan->sec_level != BT_SECURITY_SDP)
412 reason = ECONNREFUSED;
413 else
414 reason = ETIMEDOUT;
415
416 l2cap_chan_close(chan, reason);
417
418 l2cap_chan_unlock(chan);
419
420 chan->ops->close(chan);
421 mutex_unlock(&conn->chan_lock);
422
423 l2cap_chan_put(chan);
424 }
425
426 struct l2cap_chan *l2cap_chan_create(void)
427 {
428 struct l2cap_chan *chan;
429
430 chan = kzalloc(sizeof(*chan), GFP_ATOMIC);
431 if (!chan)
432 return NULL;
433
434 mutex_init(&chan->lock);
435
436 write_lock(&chan_list_lock);
437 list_add(&chan->global_l, &chan_list);
438 write_unlock(&chan_list_lock);
439
440 INIT_DELAYED_WORK(&chan->chan_timer, l2cap_chan_timeout);
441
442 chan->state = BT_OPEN;
443
444 kref_init(&chan->kref);
445
446 /* This flag is cleared in l2cap_chan_ready() */
447 set_bit(CONF_NOT_COMPLETE, &chan->conf_state);
448
449 BT_DBG("chan %p", chan);
450
451 return chan;
452 }
453
454 static void l2cap_chan_destroy(struct kref *kref)
455 {
456 struct l2cap_chan *chan = container_of(kref, struct l2cap_chan, kref);
457
458 BT_DBG("chan %p", chan);
459
460 write_lock(&chan_list_lock);
461 list_del(&chan->global_l);
462 write_unlock(&chan_list_lock);
463
464 kfree(chan);
465 }
466
467 void l2cap_chan_hold(struct l2cap_chan *c)
468 {
469 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
470
471 kref_get(&c->kref);
472 }
473
474 void l2cap_chan_put(struct l2cap_chan *c)
475 {
476 BT_DBG("chan %p orig refcnt %d", c, atomic_read(&c->kref.refcount));
477
478 kref_put(&c->kref, l2cap_chan_destroy);
479 }
480
481 void l2cap_chan_set_defaults(struct l2cap_chan *chan)
482 {
483 chan->fcs = L2CAP_FCS_CRC16;
484 chan->max_tx = L2CAP_DEFAULT_MAX_TX;
485 chan->tx_win = L2CAP_DEFAULT_TX_WINDOW;
486 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
487 chan->ack_win = L2CAP_DEFAULT_TX_WINDOW;
488 chan->sec_level = BT_SECURITY_LOW;
489
490 set_bit(FLAG_FORCE_ACTIVE, &chan->flags);
491 }
492
493 void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
494 {
495 BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,
496 __le16_to_cpu(chan->psm), chan->dcid);
497
498 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
499
500 chan->conn = conn;
501
502 switch (chan->chan_type) {
503 case L2CAP_CHAN_CONN_ORIENTED:
504 if (conn->hcon->type == LE_LINK) {
505 /* LE connection */
506 chan->omtu = L2CAP_DEFAULT_MTU;
507 if (chan->dcid == L2CAP_CID_ATT)
508 chan->scid = L2CAP_CID_ATT;
509 else
510 chan->scid = l2cap_alloc_cid(conn);
511 } else {
512 /* Alloc CID for connection-oriented socket */
513 chan->scid = l2cap_alloc_cid(conn);
514 chan->omtu = L2CAP_DEFAULT_MTU;
515 }
516 break;
517
518 case L2CAP_CHAN_CONN_LESS:
519 /* Connectionless socket */
520 chan->scid = L2CAP_CID_CONN_LESS;
521 chan->dcid = L2CAP_CID_CONN_LESS;
522 chan->omtu = L2CAP_DEFAULT_MTU;
523 break;
524
525 case L2CAP_CHAN_CONN_FIX_A2MP:
526 chan->scid = L2CAP_CID_A2MP;
527 chan->dcid = L2CAP_CID_A2MP;
528 chan->omtu = L2CAP_A2MP_DEFAULT_MTU;
529 chan->imtu = L2CAP_A2MP_DEFAULT_MTU;
530 break;
531
532 default:
533 /* Raw socket can send/recv signalling messages only */
534 chan->scid = L2CAP_CID_SIGNALING;
535 chan->dcid = L2CAP_CID_SIGNALING;
536 chan->omtu = L2CAP_DEFAULT_MTU;
537 }
538
539 chan->local_id = L2CAP_BESTEFFORT_ID;
540 chan->local_stype = L2CAP_SERV_BESTEFFORT;
541 chan->local_msdu = L2CAP_DEFAULT_MAX_SDU_SIZE;
542 chan->local_sdu_itime = L2CAP_DEFAULT_SDU_ITIME;
543 chan->local_acc_lat = L2CAP_DEFAULT_ACC_LAT;
544 chan->local_flush_to = L2CAP_EFS_DEFAULT_FLUSH_TO;
545
546 l2cap_chan_hold(chan);
547
548 hci_conn_hold(conn->hcon);
549
550 list_add(&chan->list, &conn->chan_l);
551 }
552
553 void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
554 {
555 mutex_lock(&conn->chan_lock);
556 __l2cap_chan_add(conn, chan);
557 mutex_unlock(&conn->chan_lock);
558 }
559
560 void l2cap_chan_del(struct l2cap_chan *chan, int err)
561 {
562 struct l2cap_conn *conn = chan->conn;
563
564 __clear_chan_timer(chan);
565
566 BT_DBG("chan %p, conn %p, err %d", chan, conn, err);
567
568 if (conn) {
569 struct amp_mgr *mgr = conn->hcon->amp_mgr;
570 /* Delete from channel list */
571 list_del(&chan->list);
572
573 l2cap_chan_put(chan);
574
575 chan->conn = NULL;
576
577 if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
578 hci_conn_drop(conn->hcon);
579
580 if (mgr && mgr->bredr_chan == chan)
581 mgr->bredr_chan = NULL;
582 }
583
584 if (chan->hs_hchan) {
585 struct hci_chan *hs_hchan = chan->hs_hchan;
586
587 BT_DBG("chan %p disconnect hs_hchan %p", chan, hs_hchan);
588 amp_disconnect_logical_link(hs_hchan);
589 }
590
591 chan->ops->teardown(chan, err);
592
593 if (test_bit(CONF_NOT_COMPLETE, &chan->conf_state))
594 return;
595
596 switch(chan->mode) {
597 case L2CAP_MODE_BASIC:
598 break;
599
600 case L2CAP_MODE_ERTM:
601 __clear_retrans_timer(chan);
602 __clear_monitor_timer(chan);
603 __clear_ack_timer(chan);
604
605 skb_queue_purge(&chan->srej_q);
606
607 l2cap_seq_list_free(&chan->srej_list);
608 l2cap_seq_list_free(&chan->retrans_list);
609
610 /* fall through */
611
612 case L2CAP_MODE_STREAMING:
613 skb_queue_purge(&chan->tx_q);
614 break;
615 }
616
617 return;
618 }
619
620 void l2cap_chan_close(struct l2cap_chan *chan, int reason)
621 {
622 struct l2cap_conn *conn = chan->conn;
623
624 BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
625
626 switch (chan->state) {
627 case BT_LISTEN:
628 chan->ops->teardown(chan, 0);
629 break;
630
631 case BT_CONNECTED:
632 case BT_CONFIG:
633 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
634 conn->hcon->type == ACL_LINK) {
635 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
636 l2cap_send_disconn_req(chan, reason);
637 } else
638 l2cap_chan_del(chan, reason);
639 break;
640
641 case BT_CONNECT2:
642 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED &&
643 conn->hcon->type == ACL_LINK) {
644 struct l2cap_conn_rsp rsp;
645 __u16 result;
646
647 if (test_bit(FLAG_DEFER_SETUP, &chan->flags))
648 result = L2CAP_CR_SEC_BLOCK;
649 else
650 result = L2CAP_CR_BAD_PSM;
651
652 l2cap_state_change(chan, BT_DISCONN);
653
654 rsp.scid = cpu_to_le16(chan->dcid);
655 rsp.dcid = cpu_to_le16(chan->scid);
656 rsp.result = cpu_to_le16(result);
657 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
658 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
659 sizeof(rsp), &rsp);
660 }
661
662 l2cap_chan_del(chan, reason);
663 break;
664
665 case BT_CONNECT:
666 case BT_DISCONN:
667 l2cap_chan_del(chan, reason);
668 break;
669
670 default:
671 chan->ops->teardown(chan, 0);
672 break;
673 }
674 }
675
676 static inline u8 l2cap_get_auth_type(struct l2cap_chan *chan)
677 {
678 switch (chan->chan_type) {
679 case L2CAP_CHAN_RAW:
680 switch (chan->sec_level) {
681 case BT_SECURITY_HIGH:
682 return HCI_AT_DEDICATED_BONDING_MITM;
683 case BT_SECURITY_MEDIUM:
684 return HCI_AT_DEDICATED_BONDING;
685 default:
686 return HCI_AT_NO_BONDING;
687 }
688 break;
689 case L2CAP_CHAN_CONN_LESS:
690 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_3DSP)) {
691 if (chan->sec_level == BT_SECURITY_LOW)
692 chan->sec_level = BT_SECURITY_SDP;
693 }
694 if (chan->sec_level == BT_SECURITY_HIGH)
695 return HCI_AT_NO_BONDING_MITM;
696 else
697 return HCI_AT_NO_BONDING;
698 break;
699 case L2CAP_CHAN_CONN_ORIENTED:
700 if (chan->psm == __constant_cpu_to_le16(L2CAP_PSM_SDP)) {
701 if (chan->sec_level == BT_SECURITY_LOW)
702 chan->sec_level = BT_SECURITY_SDP;
703
704 if (chan->sec_level == BT_SECURITY_HIGH)
705 return HCI_AT_NO_BONDING_MITM;
706 else
707 return HCI_AT_NO_BONDING;
708 }
709 /* fall through */
710 default:
711 switch (chan->sec_level) {
712 case BT_SECURITY_HIGH:
713 return HCI_AT_GENERAL_BONDING_MITM;
714 case BT_SECURITY_MEDIUM:
715 return HCI_AT_GENERAL_BONDING;
716 default:
717 return HCI_AT_NO_BONDING;
718 }
719 break;
720 }
721 }
722
723 /* Service level security */
724 int l2cap_chan_check_security(struct l2cap_chan *chan)
725 {
726 struct l2cap_conn *conn = chan->conn;
727 __u8 auth_type;
728
729 auth_type = l2cap_get_auth_type(chan);
730
731 return hci_conn_security(conn->hcon, chan->sec_level, auth_type);
732 }
733
734 static u8 l2cap_get_ident(struct l2cap_conn *conn)
735 {
736 u8 id;
737
738 /* Get next available identificator.
739 * 1 - 128 are used by kernel.
740 * 129 - 199 are reserved.
741 * 200 - 254 are used by utilities like l2ping, etc.
742 */
743
744 spin_lock(&conn->lock);
745
746 if (++conn->tx_ident > 128)
747 conn->tx_ident = 1;
748
749 id = conn->tx_ident;
750
751 spin_unlock(&conn->lock);
752
753 return id;
754 }
755
756 static void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len,
757 void *data)
758 {
759 struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data);
760 u8 flags;
761
762 BT_DBG("code 0x%2.2x", code);
763
764 if (!skb)
765 return;
766
767 if (lmp_no_flush_capable(conn->hcon->hdev))
768 flags = ACL_START_NO_FLUSH;
769 else
770 flags = ACL_START;
771
772 bt_cb(skb)->force_active = BT_POWER_FORCE_ACTIVE_ON;
773 skb->priority = HCI_PRIO_MAX;
774
775 hci_send_acl(conn->hchan, skb, flags);
776 }
777
778 static bool __chan_is_moving(struct l2cap_chan *chan)
779 {
780 return chan->move_state != L2CAP_MOVE_STABLE &&
781 chan->move_state != L2CAP_MOVE_WAIT_PREPARE;
782 }
783
784 static void l2cap_do_send(struct l2cap_chan *chan, struct sk_buff *skb)
785 {
786 struct hci_conn *hcon = chan->conn->hcon;
787 u16 flags;
788
789 BT_DBG("chan %p, skb %p len %d priority %u", chan, skb, skb->len,
790 skb->priority);
791
792 if (chan->hs_hcon && !__chan_is_moving(chan)) {
793 if (chan->hs_hchan)
794 hci_send_acl(chan->hs_hchan, skb, ACL_COMPLETE);
795 else
796 kfree_skb(skb);
797
798 return;
799 }
800
801 if (!test_bit(FLAG_FLUSHABLE, &chan->flags) &&
802 lmp_no_flush_capable(hcon->hdev))
803 flags = ACL_START_NO_FLUSH;
804 else
805 flags = ACL_START;
806
807 bt_cb(skb)->force_active = test_bit(FLAG_FORCE_ACTIVE, &chan->flags);
808 hci_send_acl(chan->conn->hchan, skb, flags);
809 }
810
811 static void __unpack_enhanced_control(u16 enh, struct l2cap_ctrl *control)
812 {
813 control->reqseq = (enh & L2CAP_CTRL_REQSEQ) >> L2CAP_CTRL_REQSEQ_SHIFT;
814 control->final = (enh & L2CAP_CTRL_FINAL) >> L2CAP_CTRL_FINAL_SHIFT;
815
816 if (enh & L2CAP_CTRL_FRAME_TYPE) {
817 /* S-Frame */
818 control->sframe = 1;
819 control->poll = (enh & L2CAP_CTRL_POLL) >> L2CAP_CTRL_POLL_SHIFT;
820 control->super = (enh & L2CAP_CTRL_SUPERVISE) >> L2CAP_CTRL_SUPER_SHIFT;
821
822 control->sar = 0;
823 control->txseq = 0;
824 } else {
825 /* I-Frame */
826 control->sframe = 0;
827 control->sar = (enh & L2CAP_CTRL_SAR) >> L2CAP_CTRL_SAR_SHIFT;
828 control->txseq = (enh & L2CAP_CTRL_TXSEQ) >> L2CAP_CTRL_TXSEQ_SHIFT;
829
830 control->poll = 0;
831 control->super = 0;
832 }
833 }
834
835 static void __unpack_extended_control(u32 ext, struct l2cap_ctrl *control)
836 {
837 control->reqseq = (ext & L2CAP_EXT_CTRL_REQSEQ) >> L2CAP_EXT_CTRL_REQSEQ_SHIFT;
838 control->final = (ext & L2CAP_EXT_CTRL_FINAL) >> L2CAP_EXT_CTRL_FINAL_SHIFT;
839
840 if (ext & L2CAP_EXT_CTRL_FRAME_TYPE) {
841 /* S-Frame */
842 control->sframe = 1;
843 control->poll = (ext & L2CAP_EXT_CTRL_POLL) >> L2CAP_EXT_CTRL_POLL_SHIFT;
844 control->super = (ext & L2CAP_EXT_CTRL_SUPERVISE) >> L2CAP_EXT_CTRL_SUPER_SHIFT;
845
846 control->sar = 0;
847 control->txseq = 0;
848 } else {
849 /* I-Frame */
850 control->sframe = 0;
851 control->sar = (ext & L2CAP_EXT_CTRL_SAR) >> L2CAP_EXT_CTRL_SAR_SHIFT;
852 control->txseq = (ext & L2CAP_EXT_CTRL_TXSEQ) >> L2CAP_EXT_CTRL_TXSEQ_SHIFT;
853
854 control->poll = 0;
855 control->super = 0;
856 }
857 }
858
859 static inline void __unpack_control(struct l2cap_chan *chan,
860 struct sk_buff *skb)
861 {
862 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
863 __unpack_extended_control(get_unaligned_le32(skb->data),
864 &bt_cb(skb)->control);
865 skb_pull(skb, L2CAP_EXT_CTRL_SIZE);
866 } else {
867 __unpack_enhanced_control(get_unaligned_le16(skb->data),
868 &bt_cb(skb)->control);
869 skb_pull(skb, L2CAP_ENH_CTRL_SIZE);
870 }
871 }
872
873 static u32 __pack_extended_control(struct l2cap_ctrl *control)
874 {
875 u32 packed;
876
877 packed = control->reqseq << L2CAP_EXT_CTRL_REQSEQ_SHIFT;
878 packed |= control->final << L2CAP_EXT_CTRL_FINAL_SHIFT;
879
880 if (control->sframe) {
881 packed |= control->poll << L2CAP_EXT_CTRL_POLL_SHIFT;
882 packed |= control->super << L2CAP_EXT_CTRL_SUPER_SHIFT;
883 packed |= L2CAP_EXT_CTRL_FRAME_TYPE;
884 } else {
885 packed |= control->sar << L2CAP_EXT_CTRL_SAR_SHIFT;
886 packed |= control->txseq << L2CAP_EXT_CTRL_TXSEQ_SHIFT;
887 }
888
889 return packed;
890 }
891
892 static u16 __pack_enhanced_control(struct l2cap_ctrl *control)
893 {
894 u16 packed;
895
896 packed = control->reqseq << L2CAP_CTRL_REQSEQ_SHIFT;
897 packed |= control->final << L2CAP_CTRL_FINAL_SHIFT;
898
899 if (control->sframe) {
900 packed |= control->poll << L2CAP_CTRL_POLL_SHIFT;
901 packed |= control->super << L2CAP_CTRL_SUPER_SHIFT;
902 packed |= L2CAP_CTRL_FRAME_TYPE;
903 } else {
904 packed |= control->sar << L2CAP_CTRL_SAR_SHIFT;
905 packed |= control->txseq << L2CAP_CTRL_TXSEQ_SHIFT;
906 }
907
908 return packed;
909 }
910
911 static inline void __pack_control(struct l2cap_chan *chan,
912 struct l2cap_ctrl *control,
913 struct sk_buff *skb)
914 {
915 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
916 put_unaligned_le32(__pack_extended_control(control),
917 skb->data + L2CAP_HDR_SIZE);
918 } else {
919 put_unaligned_le16(__pack_enhanced_control(control),
920 skb->data + L2CAP_HDR_SIZE);
921 }
922 }
923
924 static inline unsigned int __ertm_hdr_size(struct l2cap_chan *chan)
925 {
926 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
927 return L2CAP_EXT_HDR_SIZE;
928 else
929 return L2CAP_ENH_HDR_SIZE;
930 }
931
932 static struct sk_buff *l2cap_create_sframe_pdu(struct l2cap_chan *chan,
933 u32 control)
934 {
935 struct sk_buff *skb;
936 struct l2cap_hdr *lh;
937 int hlen = __ertm_hdr_size(chan);
938
939 if (chan->fcs == L2CAP_FCS_CRC16)
940 hlen += L2CAP_FCS_SIZE;
941
942 skb = bt_skb_alloc(hlen, GFP_KERNEL);
943
944 if (!skb)
945 return ERR_PTR(-ENOMEM);
946
947 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
948 lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE);
949 lh->cid = cpu_to_le16(chan->dcid);
950
951 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
952 put_unaligned_le32(control, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
953 else
954 put_unaligned_le16(control, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
955
956 if (chan->fcs == L2CAP_FCS_CRC16) {
957 u16 fcs = crc16(0, (u8 *)skb->data, skb->len);
958 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
959 }
960
961 skb->priority = HCI_PRIO_MAX;
962 return skb;
963 }
964
965 static void l2cap_send_sframe(struct l2cap_chan *chan,
966 struct l2cap_ctrl *control)
967 {
968 struct sk_buff *skb;
969 u32 control_field;
970
971 BT_DBG("chan %p, control %p", chan, control);
972
973 if (!control->sframe)
974 return;
975
976 if (__chan_is_moving(chan))
977 return;
978
979 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state) &&
980 !control->poll)
981 control->final = 1;
982
983 if (control->super == L2CAP_SUPER_RR)
984 clear_bit(CONN_RNR_SENT, &chan->conn_state);
985 else if (control->super == L2CAP_SUPER_RNR)
986 set_bit(CONN_RNR_SENT, &chan->conn_state);
987
988 if (control->super != L2CAP_SUPER_SREJ) {
989 chan->last_acked_seq = control->reqseq;
990 __clear_ack_timer(chan);
991 }
992
993 BT_DBG("reqseq %d, final %d, poll %d, super %d", control->reqseq,
994 control->final, control->poll, control->super);
995
996 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
997 control_field = __pack_extended_control(control);
998 else
999 control_field = __pack_enhanced_control(control);
1000
1001 skb = l2cap_create_sframe_pdu(chan, control_field);
1002 if (!IS_ERR(skb))
1003 l2cap_do_send(chan, skb);
1004 }
1005
1006 static void l2cap_send_rr_or_rnr(struct l2cap_chan *chan, bool poll)
1007 {
1008 struct l2cap_ctrl control;
1009
1010 BT_DBG("chan %p, poll %d", chan, poll);
1011
1012 memset(&control, 0, sizeof(control));
1013 control.sframe = 1;
1014 control.poll = poll;
1015
1016 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
1017 control.super = L2CAP_SUPER_RNR;
1018 else
1019 control.super = L2CAP_SUPER_RR;
1020
1021 control.reqseq = chan->buffer_seq;
1022 l2cap_send_sframe(chan, &control);
1023 }
1024
1025 static inline int __l2cap_no_conn_pending(struct l2cap_chan *chan)
1026 {
1027 return !test_bit(CONF_CONNECT_PEND, &chan->conf_state);
1028 }
1029
1030 static bool __amp_capable(struct l2cap_chan *chan)
1031 {
1032 struct l2cap_conn *conn = chan->conn;
1033 struct hci_dev *hdev;
1034 bool amp_available = false;
1035
1036 if (!conn->hs_enabled)
1037 return false;
1038
1039 if (!(conn->fixed_chan_mask & L2CAP_FC_A2MP))
1040 return false;
1041
1042 read_lock(&hci_dev_list_lock);
1043 list_for_each_entry(hdev, &hci_dev_list, list) {
1044 if (hdev->amp_type != AMP_TYPE_BREDR &&
1045 test_bit(HCI_UP, &hdev->flags)) {
1046 amp_available = true;
1047 break;
1048 }
1049 }
1050 read_unlock(&hci_dev_list_lock);
1051
1052 if (chan->chan_policy == BT_CHANNEL_POLICY_AMP_PREFERRED)
1053 return amp_available;
1054
1055 return false;
1056 }
1057
1058 static bool l2cap_check_efs(struct l2cap_chan *chan)
1059 {
1060 /* Check EFS parameters */
1061 return true;
1062 }
1063
1064 void l2cap_send_conn_req(struct l2cap_chan *chan)
1065 {
1066 struct l2cap_conn *conn = chan->conn;
1067 struct l2cap_conn_req req;
1068
1069 req.scid = cpu_to_le16(chan->scid);
1070 req.psm = chan->psm;
1071
1072 chan->ident = l2cap_get_ident(conn);
1073
1074 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
1075
1076 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_REQ, sizeof(req), &req);
1077 }
1078
1079 static void l2cap_send_create_chan_req(struct l2cap_chan *chan, u8 amp_id)
1080 {
1081 struct l2cap_create_chan_req req;
1082 req.scid = cpu_to_le16(chan->scid);
1083 req.psm = chan->psm;
1084 req.amp_id = amp_id;
1085
1086 chan->ident = l2cap_get_ident(chan->conn);
1087
1088 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_REQ,
1089 sizeof(req), &req);
1090 }
1091
1092 static void l2cap_move_setup(struct l2cap_chan *chan)
1093 {
1094 struct sk_buff *skb;
1095
1096 BT_DBG("chan %p", chan);
1097
1098 if (chan->mode != L2CAP_MODE_ERTM)
1099 return;
1100
1101 __clear_retrans_timer(chan);
1102 __clear_monitor_timer(chan);
1103 __clear_ack_timer(chan);
1104
1105 chan->retry_count = 0;
1106 skb_queue_walk(&chan->tx_q, skb) {
1107 if (bt_cb(skb)->control.retries)
1108 bt_cb(skb)->control.retries = 1;
1109 else
1110 break;
1111 }
1112
1113 chan->expected_tx_seq = chan->buffer_seq;
1114
1115 clear_bit(CONN_REJ_ACT, &chan->conn_state);
1116 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
1117 l2cap_seq_list_clear(&chan->retrans_list);
1118 l2cap_seq_list_clear(&chan->srej_list);
1119 skb_queue_purge(&chan->srej_q);
1120
1121 chan->tx_state = L2CAP_TX_STATE_XMIT;
1122 chan->rx_state = L2CAP_RX_STATE_MOVE;
1123
1124 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
1125 }
1126
1127 static void l2cap_move_done(struct l2cap_chan *chan)
1128 {
1129 u8 move_role = chan->move_role;
1130 BT_DBG("chan %p", chan);
1131
1132 chan->move_state = L2CAP_MOVE_STABLE;
1133 chan->move_role = L2CAP_MOVE_ROLE_NONE;
1134
1135 if (chan->mode != L2CAP_MODE_ERTM)
1136 return;
1137
1138 switch (move_role) {
1139 case L2CAP_MOVE_ROLE_INITIATOR:
1140 l2cap_tx(chan, NULL, NULL, L2CAP_EV_EXPLICIT_POLL);
1141 chan->rx_state = L2CAP_RX_STATE_WAIT_F;
1142 break;
1143 case L2CAP_MOVE_ROLE_RESPONDER:
1144 chan->rx_state = L2CAP_RX_STATE_WAIT_P;
1145 break;
1146 }
1147 }
1148
1149 static void l2cap_chan_ready(struct l2cap_chan *chan)
1150 {
1151 /* This clears all conf flags, including CONF_NOT_COMPLETE */
1152 chan->conf_state = 0;
1153 __clear_chan_timer(chan);
1154
1155 chan->state = BT_CONNECTED;
1156
1157 chan->ops->ready(chan);
1158 }
1159
1160 static void l2cap_start_connection(struct l2cap_chan *chan)
1161 {
1162 if (__amp_capable(chan)) {
1163 BT_DBG("chan %p AMP capable: discover AMPs", chan);
1164 a2mp_discover_amp(chan);
1165 } else {
1166 l2cap_send_conn_req(chan);
1167 }
1168 }
1169
1170 static void l2cap_do_start(struct l2cap_chan *chan)
1171 {
1172 struct l2cap_conn *conn = chan->conn;
1173
1174 if (conn->hcon->type == LE_LINK) {
1175 l2cap_chan_ready(chan);
1176 return;
1177 }
1178
1179 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) {
1180 if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE))
1181 return;
1182
1183 if (l2cap_chan_check_security(chan) &&
1184 __l2cap_no_conn_pending(chan)) {
1185 l2cap_start_connection(chan);
1186 }
1187 } else {
1188 struct l2cap_info_req req;
1189 req.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
1190
1191 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
1192 conn->info_ident = l2cap_get_ident(conn);
1193
1194 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
1195
1196 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
1197 sizeof(req), &req);
1198 }
1199 }
1200
1201 static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask)
1202 {
1203 u32 local_feat_mask = l2cap_feat_mask;
1204 if (!disable_ertm)
1205 local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING;
1206
1207 switch (mode) {
1208 case L2CAP_MODE_ERTM:
1209 return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask;
1210 case L2CAP_MODE_STREAMING:
1211 return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask;
1212 default:
1213 return 0x00;
1214 }
1215 }
1216
1217 static void l2cap_send_disconn_req(struct l2cap_chan *chan, int err)
1218 {
1219 struct l2cap_conn *conn = chan->conn;
1220 struct l2cap_disconn_req req;
1221
1222 if (!conn)
1223 return;
1224
1225 if (chan->mode == L2CAP_MODE_ERTM && chan->state == BT_CONNECTED) {
1226 __clear_retrans_timer(chan);
1227 __clear_monitor_timer(chan);
1228 __clear_ack_timer(chan);
1229 }
1230
1231 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1232 l2cap_state_change(chan, BT_DISCONN);
1233 return;
1234 }
1235
1236 req.dcid = cpu_to_le16(chan->dcid);
1237 req.scid = cpu_to_le16(chan->scid);
1238 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_DISCONN_REQ,
1239 sizeof(req), &req);
1240
1241 l2cap_state_change_and_error(chan, BT_DISCONN, err);
1242 }
1243
1244 /* ---- L2CAP connections ---- */
1245 static void l2cap_conn_start(struct l2cap_conn *conn)
1246 {
1247 struct l2cap_chan *chan, *tmp;
1248
1249 BT_DBG("conn %p", conn);
1250
1251 mutex_lock(&conn->chan_lock);
1252
1253 list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
1254 l2cap_chan_lock(chan);
1255
1256 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1257 l2cap_chan_unlock(chan);
1258 continue;
1259 }
1260
1261 if (chan->state == BT_CONNECT) {
1262 if (!l2cap_chan_check_security(chan) ||
1263 !__l2cap_no_conn_pending(chan)) {
1264 l2cap_chan_unlock(chan);
1265 continue;
1266 }
1267
1268 if (!l2cap_mode_supported(chan->mode, conn->feat_mask)
1269 && test_bit(CONF_STATE2_DEVICE,
1270 &chan->conf_state)) {
1271 l2cap_chan_close(chan, ECONNRESET);
1272 l2cap_chan_unlock(chan);
1273 continue;
1274 }
1275
1276 l2cap_start_connection(chan);
1277
1278 } else if (chan->state == BT_CONNECT2) {
1279 struct l2cap_conn_rsp rsp;
1280 char buf[128];
1281 rsp.scid = cpu_to_le16(chan->dcid);
1282 rsp.dcid = cpu_to_le16(chan->scid);
1283
1284 if (l2cap_chan_check_security(chan)) {
1285 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
1286 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1287 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
1288 chan->ops->defer(chan);
1289
1290 } else {
1291 l2cap_state_change(chan, BT_CONFIG);
1292 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
1293 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
1294 }
1295 } else {
1296 rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
1297 rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
1298 }
1299
1300 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
1301 sizeof(rsp), &rsp);
1302
1303 if (test_bit(CONF_REQ_SENT, &chan->conf_state) ||
1304 rsp.result != L2CAP_CR_SUCCESS) {
1305 l2cap_chan_unlock(chan);
1306 continue;
1307 }
1308
1309 set_bit(CONF_REQ_SENT, &chan->conf_state);
1310 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
1311 l2cap_build_conf_req(chan, buf), buf);
1312 chan->num_conf_req++;
1313 }
1314
1315 l2cap_chan_unlock(chan);
1316 }
1317
1318 mutex_unlock(&conn->chan_lock);
1319 }
1320
1321 /* Find socket with cid and source/destination bdaddr.
1322 * Returns closest match, locked.
1323 */
1324 static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid,
1325 bdaddr_t *src,
1326 bdaddr_t *dst)
1327 {
1328 struct l2cap_chan *c, *c1 = NULL;
1329
1330 read_lock(&chan_list_lock);
1331
1332 list_for_each_entry(c, &chan_list, global_l) {
1333 if (state && c->state != state)
1334 continue;
1335
1336 if (c->scid == cid) {
1337 int src_match, dst_match;
1338 int src_any, dst_any;
1339
1340 /* Exact match. */
1341 src_match = !bacmp(&c->src, src);
1342 dst_match = !bacmp(&c->dst, dst);
1343 if (src_match && dst_match) {
1344 read_unlock(&chan_list_lock);
1345 return c;
1346 }
1347
1348 /* Closest match */
1349 src_any = !bacmp(&c->src, BDADDR_ANY);
1350 dst_any = !bacmp(&c->dst, BDADDR_ANY);
1351 if ((src_match && dst_any) || (src_any && dst_match) ||
1352 (src_any && dst_any))
1353 c1 = c;
1354 }
1355 }
1356
1357 read_unlock(&chan_list_lock);
1358
1359 return c1;
1360 }
1361
1362 static void l2cap_le_conn_ready(struct l2cap_conn *conn)
1363 {
1364 struct hci_conn *hcon = conn->hcon;
1365 struct l2cap_chan *chan, *pchan;
1366 u8 dst_type;
1367
1368 BT_DBG("");
1369
1370 /* Check if we have socket listening on cid */
1371 pchan = l2cap_global_chan_by_scid(BT_LISTEN, L2CAP_CID_ATT,
1372 &hcon->src, &hcon->dst);
1373 if (!pchan)
1374 return;
1375
1376 /* Client ATT sockets should override the server one */
1377 if (__l2cap_get_chan_by_dcid(conn, L2CAP_CID_ATT))
1378 return;
1379
1380 dst_type = bdaddr_type(hcon, hcon->dst_type);
1381
1382 /* If device is blocked, do not create a channel for it */
1383 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type))
1384 return;
1385
1386 l2cap_chan_lock(pchan);
1387
1388 chan = pchan->ops->new_connection(pchan);
1389 if (!chan)
1390 goto clean;
1391
1392 chan->dcid = L2CAP_CID_ATT;
1393
1394 bacpy(&chan->src, &hcon->src);
1395 bacpy(&chan->dst, &hcon->dst);
1396 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1397 chan->dst_type = dst_type;
1398
1399 __l2cap_chan_add(conn, chan);
1400
1401 clean:
1402 l2cap_chan_unlock(pchan);
1403 }
1404
1405 static void l2cap_conn_ready(struct l2cap_conn *conn)
1406 {
1407 struct l2cap_chan *chan;
1408 struct hci_conn *hcon = conn->hcon;
1409
1410 BT_DBG("conn %p", conn);
1411
1412 /* For outgoing pairing which doesn't necessarily have an
1413 * associated socket (e.g. mgmt_pair_device).
1414 */
1415 if (hcon->out && hcon->type == LE_LINK)
1416 smp_conn_security(hcon, hcon->pending_sec_level);
1417
1418 mutex_lock(&conn->chan_lock);
1419
1420 if (hcon->type == LE_LINK)
1421 l2cap_le_conn_ready(conn);
1422
1423 list_for_each_entry(chan, &conn->chan_l, list) {
1424
1425 l2cap_chan_lock(chan);
1426
1427 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
1428 l2cap_chan_unlock(chan);
1429 continue;
1430 }
1431
1432 if (hcon->type == LE_LINK) {
1433 if (smp_conn_security(hcon, chan->sec_level))
1434 l2cap_chan_ready(chan);
1435
1436 } else if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1437 l2cap_chan_ready(chan);
1438
1439 } else if (chan->state == BT_CONNECT) {
1440 l2cap_do_start(chan);
1441 }
1442
1443 l2cap_chan_unlock(chan);
1444 }
1445
1446 mutex_unlock(&conn->chan_lock);
1447 }
1448
1449 /* Notify sockets that we cannot guaranty reliability anymore */
1450 static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
1451 {
1452 struct l2cap_chan *chan;
1453
1454 BT_DBG("conn %p", conn);
1455
1456 mutex_lock(&conn->chan_lock);
1457
1458 list_for_each_entry(chan, &conn->chan_l, list) {
1459 if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
1460 l2cap_chan_set_err(chan, err);
1461 }
1462
1463 mutex_unlock(&conn->chan_lock);
1464 }
1465
1466 static void l2cap_info_timeout(struct work_struct *work)
1467 {
1468 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1469 info_timer.work);
1470
1471 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
1472 conn->info_ident = 0;
1473
1474 l2cap_conn_start(conn);
1475 }
1476
1477 /*
1478 * l2cap_user
1479 * External modules can register l2cap_user objects on l2cap_conn. The ->probe
1480 * callback is called during registration. The ->remove callback is called
1481 * during unregistration.
1482 * An l2cap_user object can either be explicitly unregistered or when the
1483 * underlying l2cap_conn object is deleted. This guarantees that l2cap->hcon,
1484 * l2cap->hchan, .. are valid as long as the remove callback hasn't been called.
1485 * External modules must own a reference to the l2cap_conn object if they intend
1486 * to call l2cap_unregister_user(). The l2cap_conn object might get destroyed at
1487 * any time if they don't.
1488 */
1489
1490 int l2cap_register_user(struct l2cap_conn *conn, struct l2cap_user *user)
1491 {
1492 struct hci_dev *hdev = conn->hcon->hdev;
1493 int ret;
1494
1495 /* We need to check whether l2cap_conn is registered. If it is not, we
1496 * must not register the l2cap_user. l2cap_conn_del() is unregisters
1497 * l2cap_conn objects, but doesn't provide its own locking. Instead, it
1498 * relies on the parent hci_conn object to be locked. This itself relies
1499 * on the hci_dev object to be locked. So we must lock the hci device
1500 * here, too. */
1501
1502 hci_dev_lock(hdev);
1503
1504 if (user->list.next || user->list.prev) {
1505 ret = -EINVAL;
1506 goto out_unlock;
1507 }
1508
1509 /* conn->hchan is NULL after l2cap_conn_del() was called */
1510 if (!conn->hchan) {
1511 ret = -ENODEV;
1512 goto out_unlock;
1513 }
1514
1515 ret = user->probe(conn, user);
1516 if (ret)
1517 goto out_unlock;
1518
1519 list_add(&user->list, &conn->users);
1520 ret = 0;
1521
1522 out_unlock:
1523 hci_dev_unlock(hdev);
1524 return ret;
1525 }
1526 EXPORT_SYMBOL(l2cap_register_user);
1527
1528 void l2cap_unregister_user(struct l2cap_conn *conn, struct l2cap_user *user)
1529 {
1530 struct hci_dev *hdev = conn->hcon->hdev;
1531
1532 hci_dev_lock(hdev);
1533
1534 if (!user->list.next || !user->list.prev)
1535 goto out_unlock;
1536
1537 list_del(&user->list);
1538 user->list.next = NULL;
1539 user->list.prev = NULL;
1540 user->remove(conn, user);
1541
1542 out_unlock:
1543 hci_dev_unlock(hdev);
1544 }
1545 EXPORT_SYMBOL(l2cap_unregister_user);
1546
1547 static void l2cap_unregister_all_users(struct l2cap_conn *conn)
1548 {
1549 struct l2cap_user *user;
1550
1551 while (!list_empty(&conn->users)) {
1552 user = list_first_entry(&conn->users, struct l2cap_user, list);
1553 list_del(&user->list);
1554 user->list.next = NULL;
1555 user->list.prev = NULL;
1556 user->remove(conn, user);
1557 }
1558 }
1559
1560 static void l2cap_conn_del(struct hci_conn *hcon, int err)
1561 {
1562 struct l2cap_conn *conn = hcon->l2cap_data;
1563 struct l2cap_chan *chan, *l;
1564
1565 if (!conn)
1566 return;
1567
1568 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
1569
1570 kfree_skb(conn->rx_skb);
1571
1572 l2cap_unregister_all_users(conn);
1573
1574 mutex_lock(&conn->chan_lock);
1575
1576 /* Kill channels */
1577 list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
1578 l2cap_chan_hold(chan);
1579 l2cap_chan_lock(chan);
1580
1581 l2cap_chan_del(chan, err);
1582
1583 l2cap_chan_unlock(chan);
1584
1585 chan->ops->close(chan);
1586 l2cap_chan_put(chan);
1587 }
1588
1589 mutex_unlock(&conn->chan_lock);
1590
1591 hci_chan_del(conn->hchan);
1592
1593 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
1594 cancel_delayed_work_sync(&conn->info_timer);
1595
1596 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
1597 cancel_delayed_work_sync(&conn->security_timer);
1598 smp_chan_destroy(conn);
1599 }
1600
1601 hcon->l2cap_data = NULL;
1602 conn->hchan = NULL;
1603 l2cap_conn_put(conn);
1604 }
1605
1606 static void security_timeout(struct work_struct *work)
1607 {
1608 struct l2cap_conn *conn = container_of(work, struct l2cap_conn,
1609 security_timer.work);
1610
1611 BT_DBG("conn %p", conn);
1612
1613 if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags)) {
1614 smp_chan_destroy(conn);
1615 l2cap_conn_del(conn->hcon, ETIMEDOUT);
1616 }
1617 }
1618
1619 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon)
1620 {
1621 struct l2cap_conn *conn = hcon->l2cap_data;
1622 struct hci_chan *hchan;
1623
1624 if (conn)
1625 return conn;
1626
1627 hchan = hci_chan_create(hcon);
1628 if (!hchan)
1629 return NULL;
1630
1631 conn = kzalloc(sizeof(struct l2cap_conn), GFP_KERNEL);
1632 if (!conn) {
1633 hci_chan_del(hchan);
1634 return NULL;
1635 }
1636
1637 kref_init(&conn->ref);
1638 hcon->l2cap_data = conn;
1639 conn->hcon = hcon;
1640 hci_conn_get(conn->hcon);
1641 conn->hchan = hchan;
1642
1643 BT_DBG("hcon %p conn %p hchan %p", hcon, conn, hchan);
1644
1645 switch (hcon->type) {
1646 case LE_LINK:
1647 if (hcon->hdev->le_mtu) {
1648 conn->mtu = hcon->hdev->le_mtu;
1649 break;
1650 }
1651 /* fall through */
1652 default:
1653 conn->mtu = hcon->hdev->acl_mtu;
1654 break;
1655 }
1656
1657 conn->feat_mask = 0;
1658
1659 if (hcon->type == ACL_LINK)
1660 conn->hs_enabled = test_bit(HCI_HS_ENABLED,
1661 &hcon->hdev->dev_flags);
1662
1663 spin_lock_init(&conn->lock);
1664 mutex_init(&conn->chan_lock);
1665
1666 INIT_LIST_HEAD(&conn->chan_l);
1667 INIT_LIST_HEAD(&conn->users);
1668
1669 if (hcon->type == LE_LINK)
1670 INIT_DELAYED_WORK(&conn->security_timer, security_timeout);
1671 else
1672 INIT_DELAYED_WORK(&conn->info_timer, l2cap_info_timeout);
1673
1674 conn->disc_reason = HCI_ERROR_REMOTE_USER_TERM;
1675
1676 return conn;
1677 }
1678
1679 static void l2cap_conn_free(struct kref *ref)
1680 {
1681 struct l2cap_conn *conn = container_of(ref, struct l2cap_conn, ref);
1682
1683 hci_conn_put(conn->hcon);
1684 kfree(conn);
1685 }
1686
1687 void l2cap_conn_get(struct l2cap_conn *conn)
1688 {
1689 kref_get(&conn->ref);
1690 }
1691 EXPORT_SYMBOL(l2cap_conn_get);
1692
1693 void l2cap_conn_put(struct l2cap_conn *conn)
1694 {
1695 kref_put(&conn->ref, l2cap_conn_free);
1696 }
1697 EXPORT_SYMBOL(l2cap_conn_put);
1698
1699 /* ---- Socket interface ---- */
1700
1701 /* Find socket with psm and source / destination bdaddr.
1702 * Returns closest match.
1703 */
1704 static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
1705 bdaddr_t *src,
1706 bdaddr_t *dst)
1707 {
1708 struct l2cap_chan *c, *c1 = NULL;
1709
1710 read_lock(&chan_list_lock);
1711
1712 list_for_each_entry(c, &chan_list, global_l) {
1713 if (state && c->state != state)
1714 continue;
1715
1716 if (c->psm == psm) {
1717 int src_match, dst_match;
1718 int src_any, dst_any;
1719
1720 /* Exact match. */
1721 src_match = !bacmp(&c->src, src);
1722 dst_match = !bacmp(&c->dst, dst);
1723 if (src_match && dst_match) {
1724 read_unlock(&chan_list_lock);
1725 return c;
1726 }
1727
1728 /* Closest match */
1729 src_any = !bacmp(&c->src, BDADDR_ANY);
1730 dst_any = !bacmp(&c->dst, BDADDR_ANY);
1731 if ((src_match && dst_any) || (src_any && dst_match) ||
1732 (src_any && dst_any))
1733 c1 = c;
1734 }
1735 }
1736
1737 read_unlock(&chan_list_lock);
1738
1739 return c1;
1740 }
1741
1742 int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
1743 bdaddr_t *dst, u8 dst_type)
1744 {
1745 struct l2cap_conn *conn;
1746 struct hci_conn *hcon;
1747 struct hci_dev *hdev;
1748 __u8 auth_type;
1749 int err;
1750
1751 BT_DBG("%pMR -> %pMR (type %u) psm 0x%2.2x", &chan->src, dst,
1752 dst_type, __le16_to_cpu(psm));
1753
1754 hdev = hci_get_route(dst, &chan->src);
1755 if (!hdev)
1756 return -EHOSTUNREACH;
1757
1758 hci_dev_lock(hdev);
1759
1760 l2cap_chan_lock(chan);
1761
1762 /* PSM must be odd and lsb of upper byte must be 0 */
1763 if ((__le16_to_cpu(psm) & 0x0101) != 0x0001 && !cid &&
1764 chan->chan_type != L2CAP_CHAN_RAW) {
1765 err = -EINVAL;
1766 goto done;
1767 }
1768
1769 if (chan->chan_type == L2CAP_CHAN_CONN_ORIENTED && !(psm || cid)) {
1770 err = -EINVAL;
1771 goto done;
1772 }
1773
1774 switch (chan->mode) {
1775 case L2CAP_MODE_BASIC:
1776 break;
1777 case L2CAP_MODE_ERTM:
1778 case L2CAP_MODE_STREAMING:
1779 if (!disable_ertm)
1780 break;
1781 /* fall through */
1782 default:
1783 err = -ENOTSUPP;
1784 goto done;
1785 }
1786
1787 switch (chan->state) {
1788 case BT_CONNECT:
1789 case BT_CONNECT2:
1790 case BT_CONFIG:
1791 /* Already connecting */
1792 err = 0;
1793 goto done;
1794
1795 case BT_CONNECTED:
1796 /* Already connected */
1797 err = -EISCONN;
1798 goto done;
1799
1800 case BT_OPEN:
1801 case BT_BOUND:
1802 /* Can connect */
1803 break;
1804
1805 default:
1806 err = -EBADFD;
1807 goto done;
1808 }
1809
1810 /* Set destination address and psm */
1811 bacpy(&chan->dst, dst);
1812 chan->dst_type = dst_type;
1813
1814 chan->psm = psm;
1815 chan->dcid = cid;
1816
1817 auth_type = l2cap_get_auth_type(chan);
1818
1819 if (bdaddr_type_is_le(dst_type))
1820 hcon = hci_connect(hdev, LE_LINK, dst, dst_type,
1821 chan->sec_level, auth_type);
1822 else
1823 hcon = hci_connect(hdev, ACL_LINK, dst, dst_type,
1824 chan->sec_level, auth_type);
1825
1826 if (IS_ERR(hcon)) {
1827 err = PTR_ERR(hcon);
1828 goto done;
1829 }
1830
1831 conn = l2cap_conn_add(hcon);
1832 if (!conn) {
1833 hci_conn_drop(hcon);
1834 err = -ENOMEM;
1835 goto done;
1836 }
1837
1838 if (cid && __l2cap_get_chan_by_dcid(conn, cid)) {
1839 hci_conn_drop(hcon);
1840 err = -EBUSY;
1841 goto done;
1842 }
1843
1844 /* Update source addr of the socket */
1845 bacpy(&chan->src, &hcon->src);
1846 chan->src_type = bdaddr_type(hcon, hcon->src_type);
1847
1848 l2cap_chan_unlock(chan);
1849 l2cap_chan_add(conn, chan);
1850 l2cap_chan_lock(chan);
1851
1852 /* l2cap_chan_add takes its own ref so we can drop this one */
1853 hci_conn_drop(hcon);
1854
1855 l2cap_state_change(chan, BT_CONNECT);
1856 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
1857
1858 if (hcon->state == BT_CONNECTED) {
1859 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED) {
1860 __clear_chan_timer(chan);
1861 if (l2cap_chan_check_security(chan))
1862 l2cap_state_change(chan, BT_CONNECTED);
1863 } else
1864 l2cap_do_start(chan);
1865 }
1866
1867 err = 0;
1868
1869 done:
1870 l2cap_chan_unlock(chan);
1871 hci_dev_unlock(hdev);
1872 hci_dev_put(hdev);
1873 return err;
1874 }
1875
1876 static void l2cap_monitor_timeout(struct work_struct *work)
1877 {
1878 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1879 monitor_timer.work);
1880
1881 BT_DBG("chan %p", chan);
1882
1883 l2cap_chan_lock(chan);
1884
1885 if (!chan->conn) {
1886 l2cap_chan_unlock(chan);
1887 l2cap_chan_put(chan);
1888 return;
1889 }
1890
1891 l2cap_tx(chan, NULL, NULL, L2CAP_EV_MONITOR_TO);
1892
1893 l2cap_chan_unlock(chan);
1894 l2cap_chan_put(chan);
1895 }
1896
1897 static void l2cap_retrans_timeout(struct work_struct *work)
1898 {
1899 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
1900 retrans_timer.work);
1901
1902 BT_DBG("chan %p", chan);
1903
1904 l2cap_chan_lock(chan);
1905
1906 if (!chan->conn) {
1907 l2cap_chan_unlock(chan);
1908 l2cap_chan_put(chan);
1909 return;
1910 }
1911
1912 l2cap_tx(chan, NULL, NULL, L2CAP_EV_RETRANS_TO);
1913 l2cap_chan_unlock(chan);
1914 l2cap_chan_put(chan);
1915 }
1916
1917 static void l2cap_streaming_send(struct l2cap_chan *chan,
1918 struct sk_buff_head *skbs)
1919 {
1920 struct sk_buff *skb;
1921 struct l2cap_ctrl *control;
1922
1923 BT_DBG("chan %p, skbs %p", chan, skbs);
1924
1925 if (__chan_is_moving(chan))
1926 return;
1927
1928 skb_queue_splice_tail_init(skbs, &chan->tx_q);
1929
1930 while (!skb_queue_empty(&chan->tx_q)) {
1931
1932 skb = skb_dequeue(&chan->tx_q);
1933
1934 bt_cb(skb)->control.retries = 1;
1935 control = &bt_cb(skb)->control;
1936
1937 control->reqseq = 0;
1938 control->txseq = chan->next_tx_seq;
1939
1940 __pack_control(chan, control, skb);
1941
1942 if (chan->fcs == L2CAP_FCS_CRC16) {
1943 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1944 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1945 }
1946
1947 l2cap_do_send(chan, skb);
1948
1949 BT_DBG("Sent txseq %u", control->txseq);
1950
1951 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
1952 chan->frames_sent++;
1953 }
1954 }
1955
1956 static int l2cap_ertm_send(struct l2cap_chan *chan)
1957 {
1958 struct sk_buff *skb, *tx_skb;
1959 struct l2cap_ctrl *control;
1960 int sent = 0;
1961
1962 BT_DBG("chan %p", chan);
1963
1964 if (chan->state != BT_CONNECTED)
1965 return -ENOTCONN;
1966
1967 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
1968 return 0;
1969
1970 if (__chan_is_moving(chan))
1971 return 0;
1972
1973 while (chan->tx_send_head &&
1974 chan->unacked_frames < chan->remote_tx_win &&
1975 chan->tx_state == L2CAP_TX_STATE_XMIT) {
1976
1977 skb = chan->tx_send_head;
1978
1979 bt_cb(skb)->control.retries = 1;
1980 control = &bt_cb(skb)->control;
1981
1982 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
1983 control->final = 1;
1984
1985 control->reqseq = chan->buffer_seq;
1986 chan->last_acked_seq = chan->buffer_seq;
1987 control->txseq = chan->next_tx_seq;
1988
1989 __pack_control(chan, control, skb);
1990
1991 if (chan->fcs == L2CAP_FCS_CRC16) {
1992 u16 fcs = crc16(0, (u8 *) skb->data, skb->len);
1993 put_unaligned_le16(fcs, skb_put(skb, L2CAP_FCS_SIZE));
1994 }
1995
1996 /* Clone after data has been modified. Data is assumed to be
1997 read-only (for locking purposes) on cloned sk_buffs.
1998 */
1999 tx_skb = skb_clone(skb, GFP_KERNEL);
2000
2001 if (!tx_skb)
2002 break;
2003
2004 __set_retrans_timer(chan);
2005
2006 chan->next_tx_seq = __next_seq(chan, chan->next_tx_seq);
2007 chan->unacked_frames++;
2008 chan->frames_sent++;
2009 sent++;
2010
2011 if (skb_queue_is_last(&chan->tx_q, skb))
2012 chan->tx_send_head = NULL;
2013 else
2014 chan->tx_send_head = skb_queue_next(&chan->tx_q, skb);
2015
2016 l2cap_do_send(chan, tx_skb);
2017 BT_DBG("Sent txseq %u", control->txseq);
2018 }
2019
2020 BT_DBG("Sent %d, %u unacked, %u in ERTM queue", sent,
2021 chan->unacked_frames, skb_queue_len(&chan->tx_q));
2022
2023 return sent;
2024 }
2025
2026 static void l2cap_ertm_resend(struct l2cap_chan *chan)
2027 {
2028 struct l2cap_ctrl control;
2029 struct sk_buff *skb;
2030 struct sk_buff *tx_skb;
2031 u16 seq;
2032
2033 BT_DBG("chan %p", chan);
2034
2035 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2036 return;
2037
2038 if (__chan_is_moving(chan))
2039 return;
2040
2041 while (chan->retrans_list.head != L2CAP_SEQ_LIST_CLEAR) {
2042 seq = l2cap_seq_list_pop(&chan->retrans_list);
2043
2044 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, seq);
2045 if (!skb) {
2046 BT_DBG("Error: Can't retransmit seq %d, frame missing",
2047 seq);
2048 continue;
2049 }
2050
2051 bt_cb(skb)->control.retries++;
2052 control = bt_cb(skb)->control;
2053
2054 if (chan->max_tx != 0 &&
2055 bt_cb(skb)->control.retries > chan->max_tx) {
2056 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
2057 l2cap_send_disconn_req(chan, ECONNRESET);
2058 l2cap_seq_list_clear(&chan->retrans_list);
2059 break;
2060 }
2061
2062 control.reqseq = chan->buffer_seq;
2063 if (test_and_clear_bit(CONN_SEND_FBIT, &chan->conn_state))
2064 control.final = 1;
2065 else
2066 control.final = 0;
2067
2068 if (skb_cloned(skb)) {
2069 /* Cloned sk_buffs are read-only, so we need a
2070 * writeable copy
2071 */
2072 tx_skb = skb_copy(skb, GFP_KERNEL);
2073 } else {
2074 tx_skb = skb_clone(skb, GFP_KERNEL);
2075 }
2076
2077 if (!tx_skb) {
2078 l2cap_seq_list_clear(&chan->retrans_list);
2079 break;
2080 }
2081
2082 /* Update skb contents */
2083 if (test_bit(FLAG_EXT_CTRL, &chan->flags)) {
2084 put_unaligned_le32(__pack_extended_control(&control),
2085 tx_skb->data + L2CAP_HDR_SIZE);
2086 } else {
2087 put_unaligned_le16(__pack_enhanced_control(&control),
2088 tx_skb->data + L2CAP_HDR_SIZE);
2089 }
2090
2091 if (chan->fcs == L2CAP_FCS_CRC16) {
2092 u16 fcs = crc16(0, (u8 *) tx_skb->data, tx_skb->len);
2093 put_unaligned_le16(fcs, skb_put(tx_skb,
2094 L2CAP_FCS_SIZE));
2095 }
2096
2097 l2cap_do_send(chan, tx_skb);
2098
2099 BT_DBG("Resent txseq %d", control.txseq);
2100
2101 chan->last_acked_seq = chan->buffer_seq;
2102 }
2103 }
2104
2105 static void l2cap_retransmit(struct l2cap_chan *chan,
2106 struct l2cap_ctrl *control)
2107 {
2108 BT_DBG("chan %p, control %p", chan, control);
2109
2110 l2cap_seq_list_append(&chan->retrans_list, control->reqseq);
2111 l2cap_ertm_resend(chan);
2112 }
2113
2114 static void l2cap_retransmit_all(struct l2cap_chan *chan,
2115 struct l2cap_ctrl *control)
2116 {
2117 struct sk_buff *skb;
2118
2119 BT_DBG("chan %p, control %p", chan, control);
2120
2121 if (control->poll)
2122 set_bit(CONN_SEND_FBIT, &chan->conn_state);
2123
2124 l2cap_seq_list_clear(&chan->retrans_list);
2125
2126 if (test_bit(CONN_REMOTE_BUSY, &chan->conn_state))
2127 return;
2128
2129 if (chan->unacked_frames) {
2130 skb_queue_walk(&chan->tx_q, skb) {
2131 if (bt_cb(skb)->control.txseq == control->reqseq ||
2132 skb == chan->tx_send_head)
2133 break;
2134 }
2135
2136 skb_queue_walk_from(&chan->tx_q, skb) {
2137 if (skb == chan->tx_send_head)
2138 break;
2139
2140 l2cap_seq_list_append(&chan->retrans_list,
2141 bt_cb(skb)->control.txseq);
2142 }
2143
2144 l2cap_ertm_resend(chan);
2145 }
2146 }
2147
2148 static void l2cap_send_ack(struct l2cap_chan *chan)
2149 {
2150 struct l2cap_ctrl control;
2151 u16 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
2152 chan->last_acked_seq);
2153 int threshold;
2154
2155 BT_DBG("chan %p last_acked_seq %d buffer_seq %d",
2156 chan, chan->last_acked_seq, chan->buffer_seq);
2157
2158 memset(&control, 0, sizeof(control));
2159 control.sframe = 1;
2160
2161 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
2162 chan->rx_state == L2CAP_RX_STATE_RECV) {
2163 __clear_ack_timer(chan);
2164 control.super = L2CAP_SUPER_RNR;
2165 control.reqseq = chan->buffer_seq;
2166 l2cap_send_sframe(chan, &control);
2167 } else {
2168 if (!test_bit(CONN_REMOTE_BUSY, &chan->conn_state)) {
2169 l2cap_ertm_send(chan);
2170 /* If any i-frames were sent, they included an ack */
2171 if (chan->buffer_seq == chan->last_acked_seq)
2172 frames_to_ack = 0;
2173 }
2174
2175 /* Ack now if the window is 3/4ths full.
2176 * Calculate without mul or div
2177 */
2178 threshold = chan->ack_win;
2179 threshold += threshold << 1;
2180 threshold >>= 2;
2181
2182 BT_DBG("frames_to_ack %u, threshold %d", frames_to_ack,
2183 threshold);
2184
2185 if (frames_to_ack >= threshold) {
2186 __clear_ack_timer(chan);
2187 control.super = L2CAP_SUPER_RR;
2188 control.reqseq = chan->buffer_seq;
2189 l2cap_send_sframe(chan, &control);
2190 frames_to_ack = 0;
2191 }
2192
2193 if (frames_to_ack)
2194 __set_ack_timer(chan);
2195 }
2196 }
2197
2198 static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
2199 struct msghdr *msg, int len,
2200 int count, struct sk_buff *skb)
2201 {
2202 struct l2cap_conn *conn = chan->conn;
2203 struct sk_buff **frag;
2204 int sent = 0;
2205
2206 if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count))
2207 return -EFAULT;
2208
2209 sent += count;
2210 len -= count;
2211
2212 /* Continuation fragments (no L2CAP header) */
2213 frag = &skb_shinfo(skb)->frag_list;
2214 while (len) {
2215 struct sk_buff *tmp;
2216
2217 count = min_t(unsigned int, conn->mtu, len);
2218
2219 tmp = chan->ops->alloc_skb(chan, count,
2220 msg->msg_flags & MSG_DONTWAIT);
2221 if (IS_ERR(tmp))
2222 return PTR_ERR(tmp);
2223
2224 *frag = tmp;
2225
2226 if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count))
2227 return -EFAULT;
2228
2229 (*frag)->priority = skb->priority;
2230
2231 sent += count;
2232 len -= count;
2233
2234 skb->len += (*frag)->len;
2235 skb->data_len += (*frag)->len;
2236
2237 frag = &(*frag)->next;
2238 }
2239
2240 return sent;
2241 }
2242
2243 static struct sk_buff *l2cap_create_connless_pdu(struct l2cap_chan *chan,
2244 struct msghdr *msg, size_t len,
2245 u32 priority)
2246 {
2247 struct l2cap_conn *conn = chan->conn;
2248 struct sk_buff *skb;
2249 int err, count, hlen = L2CAP_HDR_SIZE + L2CAP_PSMLEN_SIZE;
2250 struct l2cap_hdr *lh;
2251
2252 BT_DBG("chan %p psm 0x%2.2x len %zu priority %u", chan,
2253 __le16_to_cpu(chan->psm), len, priority);
2254
2255 count = min_t(unsigned int, (conn->mtu - hlen), len);
2256
2257 skb = chan->ops->alloc_skb(chan, count + hlen,
2258 msg->msg_flags & MSG_DONTWAIT);
2259 if (IS_ERR(skb))
2260 return skb;
2261
2262 skb->priority = priority;
2263
2264 /* Create L2CAP header */
2265 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2266 lh->cid = cpu_to_le16(chan->dcid);
2267 lh->len = cpu_to_le16(len + L2CAP_PSMLEN_SIZE);
2268 put_unaligned(chan->psm, (__le16 *) skb_put(skb, L2CAP_PSMLEN_SIZE));
2269
2270 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2271 if (unlikely(err < 0)) {
2272 kfree_skb(skb);
2273 return ERR_PTR(err);
2274 }
2275 return skb;
2276 }
2277
2278 static struct sk_buff *l2cap_create_basic_pdu(struct l2cap_chan *chan,
2279 struct msghdr *msg, size_t len,
2280 u32 priority)
2281 {
2282 struct l2cap_conn *conn = chan->conn;
2283 struct sk_buff *skb;
2284 int err, count;
2285 struct l2cap_hdr *lh;
2286
2287 BT_DBG("chan %p len %zu", chan, len);
2288
2289 count = min_t(unsigned int, (conn->mtu - L2CAP_HDR_SIZE), len);
2290
2291 skb = chan->ops->alloc_skb(chan, count + L2CAP_HDR_SIZE,
2292 msg->msg_flags & MSG_DONTWAIT);
2293 if (IS_ERR(skb))
2294 return skb;
2295
2296 skb->priority = priority;
2297
2298 /* Create L2CAP header */
2299 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2300 lh->cid = cpu_to_le16(chan->dcid);
2301 lh->len = cpu_to_le16(len);
2302
2303 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2304 if (unlikely(err < 0)) {
2305 kfree_skb(skb);
2306 return ERR_PTR(err);
2307 }
2308 return skb;
2309 }
2310
2311 static struct sk_buff *l2cap_create_iframe_pdu(struct l2cap_chan *chan,
2312 struct msghdr *msg, size_t len,
2313 u16 sdulen)
2314 {
2315 struct l2cap_conn *conn = chan->conn;
2316 struct sk_buff *skb;
2317 int err, count, hlen;
2318 struct l2cap_hdr *lh;
2319
2320 BT_DBG("chan %p len %zu", chan, len);
2321
2322 if (!conn)
2323 return ERR_PTR(-ENOTCONN);
2324
2325 hlen = __ertm_hdr_size(chan);
2326
2327 if (sdulen)
2328 hlen += L2CAP_SDULEN_SIZE;
2329
2330 if (chan->fcs == L2CAP_FCS_CRC16)
2331 hlen += L2CAP_FCS_SIZE;
2332
2333 count = min_t(unsigned int, (conn->mtu - hlen), len);
2334
2335 skb = chan->ops->alloc_skb(chan, count + hlen,
2336 msg->msg_flags & MSG_DONTWAIT);
2337 if (IS_ERR(skb))
2338 return skb;
2339
2340 /* Create L2CAP header */
2341 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2342 lh->cid = cpu_to_le16(chan->dcid);
2343 lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE));
2344
2345 /* Control header is populated later */
2346 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
2347 put_unaligned_le32(0, skb_put(skb, L2CAP_EXT_CTRL_SIZE));
2348 else
2349 put_unaligned_le16(0, skb_put(skb, L2CAP_ENH_CTRL_SIZE));
2350
2351 if (sdulen)
2352 put_unaligned_le16(sdulen, skb_put(skb, L2CAP_SDULEN_SIZE));
2353
2354 err = l2cap_skbuff_fromiovec(chan, msg, len, count, skb);
2355 if (unlikely(err < 0)) {
2356 kfree_skb(skb);
2357 return ERR_PTR(err);
2358 }
2359
2360 bt_cb(skb)->control.fcs = chan->fcs;
2361 bt_cb(skb)->control.retries = 0;
2362 return skb;
2363 }
2364
2365 static int l2cap_segment_sdu(struct l2cap_chan *chan,
2366 struct sk_buff_head *seg_queue,
2367 struct msghdr *msg, size_t len)
2368 {
2369 struct sk_buff *skb;
2370 u16 sdu_len;
2371 size_t pdu_len;
2372 u8 sar;
2373
2374 BT_DBG("chan %p, msg %p, len %zu", chan, msg, len);
2375
2376 /* It is critical that ERTM PDUs fit in a single HCI fragment,
2377 * so fragmented skbs are not used. The HCI layer's handling
2378 * of fragmented skbs is not compatible with ERTM's queueing.
2379 */
2380
2381 /* PDU size is derived from the HCI MTU */
2382 pdu_len = chan->conn->mtu;
2383
2384 /* Constrain PDU size for BR/EDR connections */
2385 if (!chan->hs_hcon)
2386 pdu_len = min_t(size_t, pdu_len, L2CAP_BREDR_MAX_PAYLOAD);
2387
2388 /* Adjust for largest possible L2CAP overhead. */
2389 if (chan->fcs)
2390 pdu_len -= L2CAP_FCS_SIZE;
2391
2392 pdu_len -= __ertm_hdr_size(chan);
2393
2394 /* Remote device may have requested smaller PDUs */
2395 pdu_len = min_t(size_t, pdu_len, chan->remote_mps);
2396
2397 if (len <= pdu_len) {
2398 sar = L2CAP_SAR_UNSEGMENTED;
2399 sdu_len = 0;
2400 pdu_len = len;
2401 } else {
2402 sar = L2CAP_SAR_START;
2403 sdu_len = len;
2404 pdu_len -= L2CAP_SDULEN_SIZE;
2405 }
2406
2407 while (len > 0) {
2408 skb = l2cap_create_iframe_pdu(chan, msg, pdu_len, sdu_len);
2409
2410 if (IS_ERR(skb)) {
2411 __skb_queue_purge(seg_queue);
2412 return PTR_ERR(skb);
2413 }
2414
2415 bt_cb(skb)->control.sar = sar;
2416 __skb_queue_tail(seg_queue, skb);
2417
2418 len -= pdu_len;
2419 if (sdu_len) {
2420 sdu_len = 0;
2421 pdu_len += L2CAP_SDULEN_SIZE;
2422 }
2423
2424 if (len <= pdu_len) {
2425 sar = L2CAP_SAR_END;
2426 pdu_len = len;
2427 } else {
2428 sar = L2CAP_SAR_CONTINUE;
2429 }
2430 }
2431
2432 return 0;
2433 }
2434
2435 int l2cap_chan_send(struct l2cap_chan *chan, struct msghdr *msg, size_t len,
2436 u32 priority)
2437 {
2438 struct sk_buff *skb;
2439 int err;
2440 struct sk_buff_head seg_queue;
2441
2442 if (!chan->conn)
2443 return -ENOTCONN;
2444
2445 /* Connectionless channel */
2446 if (chan->chan_type == L2CAP_CHAN_CONN_LESS) {
2447 skb = l2cap_create_connless_pdu(chan, msg, len, priority);
2448 if (IS_ERR(skb))
2449 return PTR_ERR(skb);
2450
2451 l2cap_do_send(chan, skb);
2452 return len;
2453 }
2454
2455 switch (chan->mode) {
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, priority);
2463 if (IS_ERR(skb))
2464 return PTR_ERR(skb);
2465
2466 l2cap_do_send(chan, skb);
2467 err = len;
2468 break;
2469
2470 case L2CAP_MODE_ERTM:
2471 case L2CAP_MODE_STREAMING:
2472 /* Check outgoing MTU */
2473 if (len > chan->omtu) {
2474 err = -EMSGSIZE;
2475 break;
2476 }
2477
2478 __skb_queue_head_init(&seg_queue);
2479
2480 /* Do segmentation before calling in to the state machine,
2481 * since it's possible to block while waiting for memory
2482 * allocation.
2483 */
2484 err = l2cap_segment_sdu(chan, &seg_queue, msg, len);
2485
2486 /* The channel could have been closed while segmenting,
2487 * check that it is still connected.
2488 */
2489 if (chan->state != BT_CONNECTED) {
2490 __skb_queue_purge(&seg_queue);
2491 err = -ENOTCONN;
2492 }
2493
2494 if (err)
2495 break;
2496
2497 if (chan->mode == L2CAP_MODE_ERTM)
2498 l2cap_tx(chan, NULL, &seg_queue, L2CAP_EV_DATA_REQUEST);
2499 else
2500 l2cap_streaming_send(chan, &seg_queue);
2501
2502 err = len;
2503
2504 /* If the skbs were not queued for sending, they'll still be in
2505 * seg_queue and need to be purged.
2506 */
2507 __skb_queue_purge(&seg_queue);
2508 break;
2509
2510 default:
2511 BT_DBG("bad state %1.1x", chan->mode);
2512 err = -EBADFD;
2513 }
2514
2515 return err;
2516 }
2517
2518 static void l2cap_send_srej(struct l2cap_chan *chan, u16 txseq)
2519 {
2520 struct l2cap_ctrl control;
2521 u16 seq;
2522
2523 BT_DBG("chan %p, txseq %u", chan, txseq);
2524
2525 memset(&control, 0, sizeof(control));
2526 control.sframe = 1;
2527 control.super = L2CAP_SUPER_SREJ;
2528
2529 for (seq = chan->expected_tx_seq; seq != txseq;
2530 seq = __next_seq(chan, seq)) {
2531 if (!l2cap_ertm_seq_in_queue(&chan->srej_q, seq)) {
2532 control.reqseq = seq;
2533 l2cap_send_sframe(chan, &control);
2534 l2cap_seq_list_append(&chan->srej_list, seq);
2535 }
2536 }
2537
2538 chan->expected_tx_seq = __next_seq(chan, txseq);
2539 }
2540
2541 static void l2cap_send_srej_tail(struct l2cap_chan *chan)
2542 {
2543 struct l2cap_ctrl control;
2544
2545 BT_DBG("chan %p", chan);
2546
2547 if (chan->srej_list.tail == L2CAP_SEQ_LIST_CLEAR)
2548 return;
2549
2550 memset(&control, 0, sizeof(control));
2551 control.sframe = 1;
2552 control.super = L2CAP_SUPER_SREJ;
2553 control.reqseq = chan->srej_list.tail;
2554 l2cap_send_sframe(chan, &control);
2555 }
2556
2557 static void l2cap_send_srej_list(struct l2cap_chan *chan, u16 txseq)
2558 {
2559 struct l2cap_ctrl control;
2560 u16 initial_head;
2561 u16 seq;
2562
2563 BT_DBG("chan %p, txseq %u", chan, txseq);
2564
2565 memset(&control, 0, sizeof(control));
2566 control.sframe = 1;
2567 control.super = L2CAP_SUPER_SREJ;
2568
2569 /* Capture initial list head to allow only one pass through the list. */
2570 initial_head = chan->srej_list.head;
2571
2572 do {
2573 seq = l2cap_seq_list_pop(&chan->srej_list);
2574 if (seq == txseq || seq == L2CAP_SEQ_LIST_CLEAR)
2575 break;
2576
2577 control.reqseq = seq;
2578 l2cap_send_sframe(chan, &control);
2579 l2cap_seq_list_append(&chan->srej_list, seq);
2580 } while (chan->srej_list.head != initial_head);
2581 }
2582
2583 static void l2cap_process_reqseq(struct l2cap_chan *chan, u16 reqseq)
2584 {
2585 struct sk_buff *acked_skb;
2586 u16 ackseq;
2587
2588 BT_DBG("chan %p, reqseq %u", chan, reqseq);
2589
2590 if (chan->unacked_frames == 0 || reqseq == chan->expected_ack_seq)
2591 return;
2592
2593 BT_DBG("expected_ack_seq %u, unacked_frames %u",
2594 chan->expected_ack_seq, chan->unacked_frames);
2595
2596 for (ackseq = chan->expected_ack_seq; ackseq != reqseq;
2597 ackseq = __next_seq(chan, ackseq)) {
2598
2599 acked_skb = l2cap_ertm_seq_in_queue(&chan->tx_q, ackseq);
2600 if (acked_skb) {
2601 skb_unlink(acked_skb, &chan->tx_q);
2602 kfree_skb(acked_skb);
2603 chan->unacked_frames--;
2604 }
2605 }
2606
2607 chan->expected_ack_seq = reqseq;
2608
2609 if (chan->unacked_frames == 0)
2610 __clear_retrans_timer(chan);
2611
2612 BT_DBG("unacked_frames %u", chan->unacked_frames);
2613 }
2614
2615 static void l2cap_abort_rx_srej_sent(struct l2cap_chan *chan)
2616 {
2617 BT_DBG("chan %p", chan);
2618
2619 chan->expected_tx_seq = chan->buffer_seq;
2620 l2cap_seq_list_clear(&chan->srej_list);
2621 skb_queue_purge(&chan->srej_q);
2622 chan->rx_state = L2CAP_RX_STATE_RECV;
2623 }
2624
2625 static void l2cap_tx_state_xmit(struct l2cap_chan *chan,
2626 struct l2cap_ctrl *control,
2627 struct sk_buff_head *skbs, u8 event)
2628 {
2629 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2630 event);
2631
2632 switch (event) {
2633 case L2CAP_EV_DATA_REQUEST:
2634 if (chan->tx_send_head == NULL)
2635 chan->tx_send_head = skb_peek(skbs);
2636
2637 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2638 l2cap_ertm_send(chan);
2639 break;
2640 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2641 BT_DBG("Enter LOCAL_BUSY");
2642 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2643
2644 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2645 /* The SREJ_SENT state must be aborted if we are to
2646 * enter the LOCAL_BUSY state.
2647 */
2648 l2cap_abort_rx_srej_sent(chan);
2649 }
2650
2651 l2cap_send_ack(chan);
2652
2653 break;
2654 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2655 BT_DBG("Exit LOCAL_BUSY");
2656 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2657
2658 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2659 struct l2cap_ctrl local_control;
2660
2661 memset(&local_control, 0, sizeof(local_control));
2662 local_control.sframe = 1;
2663 local_control.super = L2CAP_SUPER_RR;
2664 local_control.poll = 1;
2665 local_control.reqseq = chan->buffer_seq;
2666 l2cap_send_sframe(chan, &local_control);
2667
2668 chan->retry_count = 1;
2669 __set_monitor_timer(chan);
2670 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2671 }
2672 break;
2673 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2674 l2cap_process_reqseq(chan, control->reqseq);
2675 break;
2676 case L2CAP_EV_EXPLICIT_POLL:
2677 l2cap_send_rr_or_rnr(chan, 1);
2678 chan->retry_count = 1;
2679 __set_monitor_timer(chan);
2680 __clear_ack_timer(chan);
2681 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2682 break;
2683 case L2CAP_EV_RETRANS_TO:
2684 l2cap_send_rr_or_rnr(chan, 1);
2685 chan->retry_count = 1;
2686 __set_monitor_timer(chan);
2687 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2688 break;
2689 case L2CAP_EV_RECV_FBIT:
2690 /* Nothing to process */
2691 break;
2692 default:
2693 break;
2694 }
2695 }
2696
2697 static void l2cap_tx_state_wait_f(struct l2cap_chan *chan,
2698 struct l2cap_ctrl *control,
2699 struct sk_buff_head *skbs, u8 event)
2700 {
2701 BT_DBG("chan %p, control %p, skbs %p, event %d", chan, control, skbs,
2702 event);
2703
2704 switch (event) {
2705 case L2CAP_EV_DATA_REQUEST:
2706 if (chan->tx_send_head == NULL)
2707 chan->tx_send_head = skb_peek(skbs);
2708 /* Queue data, but don't send. */
2709 skb_queue_splice_tail_init(skbs, &chan->tx_q);
2710 break;
2711 case L2CAP_EV_LOCAL_BUSY_DETECTED:
2712 BT_DBG("Enter LOCAL_BUSY");
2713 set_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2714
2715 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
2716 /* The SREJ_SENT state must be aborted if we are to
2717 * enter the LOCAL_BUSY state.
2718 */
2719 l2cap_abort_rx_srej_sent(chan);
2720 }
2721
2722 l2cap_send_ack(chan);
2723
2724 break;
2725 case L2CAP_EV_LOCAL_BUSY_CLEAR:
2726 BT_DBG("Exit LOCAL_BUSY");
2727 clear_bit(CONN_LOCAL_BUSY, &chan->conn_state);
2728
2729 if (test_bit(CONN_RNR_SENT, &chan->conn_state)) {
2730 struct l2cap_ctrl local_control;
2731 memset(&local_control, 0, sizeof(local_control));
2732 local_control.sframe = 1;
2733 local_control.super = L2CAP_SUPER_RR;
2734 local_control.poll = 1;
2735 local_control.reqseq = chan->buffer_seq;
2736 l2cap_send_sframe(chan, &local_control);
2737
2738 chan->retry_count = 1;
2739 __set_monitor_timer(chan);
2740 chan->tx_state = L2CAP_TX_STATE_WAIT_F;
2741 }
2742 break;
2743 case L2CAP_EV_RECV_REQSEQ_AND_FBIT:
2744 l2cap_process_reqseq(chan, control->reqseq);
2745
2746 /* Fall through */
2747
2748 case L2CAP_EV_RECV_FBIT:
2749 if (control && control->final) {
2750 __clear_monitor_timer(chan);
2751 if (chan->unacked_frames > 0)
2752 __set_retrans_timer(chan);
2753 chan->retry_count = 0;
2754 chan->tx_state = L2CAP_TX_STATE_XMIT;
2755 BT_DBG("recv fbit tx_state 0x2.2%x", chan->tx_state);
2756 }
2757 break;
2758 case L2CAP_EV_EXPLICIT_POLL:
2759 /* Ignore */
2760 break;
2761 case L2CAP_EV_MONITOR_TO:
2762 if (chan->max_tx == 0 || chan->retry_count < chan->max_tx) {
2763 l2cap_send_rr_or_rnr(chan, 1);
2764 __set_monitor_timer(chan);
2765 chan->retry_count++;
2766 } else {
2767 l2cap_send_disconn_req(chan, ECONNABORTED);
2768 }
2769 break;
2770 default:
2771 break;
2772 }
2773 }
2774
2775 static void l2cap_tx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
2776 struct sk_buff_head *skbs, u8 event)
2777 {
2778 BT_DBG("chan %p, control %p, skbs %p, event %d, state %d",
2779 chan, control, skbs, event, chan->tx_state);
2780
2781 switch (chan->tx_state) {
2782 case L2CAP_TX_STATE_XMIT:
2783 l2cap_tx_state_xmit(chan, control, skbs, event);
2784 break;
2785 case L2CAP_TX_STATE_WAIT_F:
2786 l2cap_tx_state_wait_f(chan, control, skbs, event);
2787 break;
2788 default:
2789 /* Ignore event */
2790 break;
2791 }
2792 }
2793
2794 static void l2cap_pass_to_tx(struct l2cap_chan *chan,
2795 struct l2cap_ctrl *control)
2796 {
2797 BT_DBG("chan %p, control %p", chan, control);
2798 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_REQSEQ_AND_FBIT);
2799 }
2800
2801 static void l2cap_pass_to_tx_fbit(struct l2cap_chan *chan,
2802 struct l2cap_ctrl *control)
2803 {
2804 BT_DBG("chan %p, control %p", chan, control);
2805 l2cap_tx(chan, control, NULL, L2CAP_EV_RECV_FBIT);
2806 }
2807
2808 /* Copy frame to all raw sockets on that connection */
2809 static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
2810 {
2811 struct sk_buff *nskb;
2812 struct l2cap_chan *chan;
2813
2814 BT_DBG("conn %p", conn);
2815
2816 mutex_lock(&conn->chan_lock);
2817
2818 list_for_each_entry(chan, &conn->chan_l, list) {
2819 if (chan->chan_type != L2CAP_CHAN_RAW)
2820 continue;
2821
2822 /* Don't send frame to the channel it came from */
2823 if (bt_cb(skb)->chan == chan)
2824 continue;
2825
2826 nskb = skb_clone(skb, GFP_KERNEL);
2827 if (!nskb)
2828 continue;
2829 if (chan->ops->recv(chan, nskb))
2830 kfree_skb(nskb);
2831 }
2832
2833 mutex_unlock(&conn->chan_lock);
2834 }
2835
2836 /* ---- L2CAP signalling commands ---- */
2837 static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
2838 u8 ident, u16 dlen, void *data)
2839 {
2840 struct sk_buff *skb, **frag;
2841 struct l2cap_cmd_hdr *cmd;
2842 struct l2cap_hdr *lh;
2843 int len, count;
2844
2845 BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
2846 conn, code, ident, dlen);
2847
2848 if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
2849 return NULL;
2850
2851 len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
2852 count = min_t(unsigned int, conn->mtu, len);
2853
2854 skb = bt_skb_alloc(count, GFP_KERNEL);
2855 if (!skb)
2856 return NULL;
2857
2858 lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
2859 lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen);
2860
2861 if (conn->hcon->type == LE_LINK)
2862 lh->cid = __constant_cpu_to_le16(L2CAP_CID_LE_SIGNALING);
2863 else
2864 lh->cid = __constant_cpu_to_le16(L2CAP_CID_SIGNALING);
2865
2866 cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE);
2867 cmd->code = code;
2868 cmd->ident = ident;
2869 cmd->len = cpu_to_le16(dlen);
2870
2871 if (dlen) {
2872 count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE;
2873 memcpy(skb_put(skb, count), data, count);
2874 data += count;
2875 }
2876
2877 len -= skb->len;
2878
2879 /* Continuation fragments (no L2CAP header) */
2880 frag = &skb_shinfo(skb)->frag_list;
2881 while (len) {
2882 count = min_t(unsigned int, conn->mtu, len);
2883
2884 *frag = bt_skb_alloc(count, GFP_KERNEL);
2885 if (!*frag)
2886 goto fail;
2887
2888 memcpy(skb_put(*frag, count), data, count);
2889
2890 len -= count;
2891 data += count;
2892
2893 frag = &(*frag)->next;
2894 }
2895
2896 return skb;
2897
2898 fail:
2899 kfree_skb(skb);
2900 return NULL;
2901 }
2902
2903 static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen,
2904 unsigned long *val)
2905 {
2906 struct l2cap_conf_opt *opt = *ptr;
2907 int len;
2908
2909 len = L2CAP_CONF_OPT_SIZE + opt->len;
2910 *ptr += len;
2911
2912 *type = opt->type;
2913 *olen = opt->len;
2914
2915 switch (opt->len) {
2916 case 1:
2917 *val = *((u8 *) opt->val);
2918 break;
2919
2920 case 2:
2921 *val = get_unaligned_le16(opt->val);
2922 break;
2923
2924 case 4:
2925 *val = get_unaligned_le32(opt->val);
2926 break;
2927
2928 default:
2929 *val = (unsigned long) opt->val;
2930 break;
2931 }
2932
2933 BT_DBG("type 0x%2.2x len %u val 0x%lx", *type, opt->len, *val);
2934 return len;
2935 }
2936
2937 static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val)
2938 {
2939 struct l2cap_conf_opt *opt = *ptr;
2940
2941 BT_DBG("type 0x%2.2x len %u val 0x%lx", type, len, val);
2942
2943 opt->type = type;
2944 opt->len = len;
2945
2946 switch (len) {
2947 case 1:
2948 *((u8 *) opt->val) = val;
2949 break;
2950
2951 case 2:
2952 put_unaligned_le16(val, opt->val);
2953 break;
2954
2955 case 4:
2956 put_unaligned_le32(val, opt->val);
2957 break;
2958
2959 default:
2960 memcpy(opt->val, (void *) val, len);
2961 break;
2962 }
2963
2964 *ptr += L2CAP_CONF_OPT_SIZE + len;
2965 }
2966
2967 static void l2cap_add_opt_efs(void **ptr, struct l2cap_chan *chan)
2968 {
2969 struct l2cap_conf_efs efs;
2970
2971 switch (chan->mode) {
2972 case L2CAP_MODE_ERTM:
2973 efs.id = chan->local_id;
2974 efs.stype = chan->local_stype;
2975 efs.msdu = cpu_to_le16(chan->local_msdu);
2976 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2977 efs.acc_lat = __constant_cpu_to_le32(L2CAP_DEFAULT_ACC_LAT);
2978 efs.flush_to = __constant_cpu_to_le32(L2CAP_EFS_DEFAULT_FLUSH_TO);
2979 break;
2980
2981 case L2CAP_MODE_STREAMING:
2982 efs.id = 1;
2983 efs.stype = L2CAP_SERV_BESTEFFORT;
2984 efs.msdu = cpu_to_le16(chan->local_msdu);
2985 efs.sdu_itime = cpu_to_le32(chan->local_sdu_itime);
2986 efs.acc_lat = 0;
2987 efs.flush_to = 0;
2988 break;
2989
2990 default:
2991 return;
2992 }
2993
2994 l2cap_add_conf_opt(ptr, L2CAP_CONF_EFS, sizeof(efs),
2995 (unsigned long) &efs);
2996 }
2997
2998 static void l2cap_ack_timeout(struct work_struct *work)
2999 {
3000 struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
3001 ack_timer.work);
3002 u16 frames_to_ack;
3003
3004 BT_DBG("chan %p", chan);
3005
3006 l2cap_chan_lock(chan);
3007
3008 frames_to_ack = __seq_offset(chan, chan->buffer_seq,
3009 chan->last_acked_seq);
3010
3011 if (frames_to_ack)
3012 l2cap_send_rr_or_rnr(chan, 0);
3013
3014 l2cap_chan_unlock(chan);
3015 l2cap_chan_put(chan);
3016 }
3017
3018 int l2cap_ertm_init(struct l2cap_chan *chan)
3019 {
3020 int err;
3021
3022 chan->next_tx_seq = 0;
3023 chan->expected_tx_seq = 0;
3024 chan->expected_ack_seq = 0;
3025 chan->unacked_frames = 0;
3026 chan->buffer_seq = 0;
3027 chan->frames_sent = 0;
3028 chan->last_acked_seq = 0;
3029 chan->sdu = NULL;
3030 chan->sdu_last_frag = NULL;
3031 chan->sdu_len = 0;
3032
3033 skb_queue_head_init(&chan->tx_q);
3034
3035 chan->local_amp_id = AMP_ID_BREDR;
3036 chan->move_id = AMP_ID_BREDR;
3037 chan->move_state = L2CAP_MOVE_STABLE;
3038 chan->move_role = L2CAP_MOVE_ROLE_NONE;
3039
3040 if (chan->mode != L2CAP_MODE_ERTM)
3041 return 0;
3042
3043 chan->rx_state = L2CAP_RX_STATE_RECV;
3044 chan->tx_state = L2CAP_TX_STATE_XMIT;
3045
3046 INIT_DELAYED_WORK(&chan->retrans_timer, l2cap_retrans_timeout);
3047 INIT_DELAYED_WORK(&chan->monitor_timer, l2cap_monitor_timeout);
3048 INIT_DELAYED_WORK(&chan->ack_timer, l2cap_ack_timeout);
3049
3050 skb_queue_head_init(&chan->srej_q);
3051
3052 err = l2cap_seq_list_init(&chan->srej_list, chan->tx_win);
3053 if (err < 0)
3054 return err;
3055
3056 err = l2cap_seq_list_init(&chan->retrans_list, chan->remote_tx_win);
3057 if (err < 0)
3058 l2cap_seq_list_free(&chan->srej_list);
3059
3060 return err;
3061 }
3062
3063 static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask)
3064 {
3065 switch (mode) {
3066 case L2CAP_MODE_STREAMING:
3067 case L2CAP_MODE_ERTM:
3068 if (l2cap_mode_supported(mode, remote_feat_mask))
3069 return mode;
3070 /* fall through */
3071 default:
3072 return L2CAP_MODE_BASIC;
3073 }
3074 }
3075
3076 static inline bool __l2cap_ews_supported(struct l2cap_conn *conn)
3077 {
3078 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_WINDOW;
3079 }
3080
3081 static inline bool __l2cap_efs_supported(struct l2cap_conn *conn)
3082 {
3083 return conn->hs_enabled && conn->feat_mask & L2CAP_FEAT_EXT_FLOW;
3084 }
3085
3086 static void __l2cap_set_ertm_timeouts(struct l2cap_chan *chan,
3087 struct l2cap_conf_rfc *rfc)
3088 {
3089 if (chan->local_amp_id != AMP_ID_BREDR && chan->hs_hcon) {
3090 u64 ertm_to = chan->hs_hcon->hdev->amp_be_flush_to;
3091
3092 /* Class 1 devices have must have ERTM timeouts
3093 * exceeding the Link Supervision Timeout. The
3094 * default Link Supervision Timeout for AMP
3095 * controllers is 10 seconds.
3096 *
3097 * Class 1 devices use 0xffffffff for their
3098 * best-effort flush timeout, so the clamping logic
3099 * will result in a timeout that meets the above
3100 * requirement. ERTM timeouts are 16-bit values, so
3101 * the maximum timeout is 65.535 seconds.
3102 */
3103
3104 /* Convert timeout to milliseconds and round */
3105 ertm_to = DIV_ROUND_UP_ULL(ertm_to, 1000);
3106
3107 /* This is the recommended formula for class 2 devices
3108 * that start ERTM timers when packets are sent to the
3109 * controller.
3110 */
3111 ertm_to = 3 * ertm_to + 500;
3112
3113 if (ertm_to > 0xffff)
3114 ertm_to = 0xffff;
3115
3116 rfc->retrans_timeout = cpu_to_le16((u16) ertm_to);
3117 rfc->monitor_timeout = rfc->retrans_timeout;
3118 } else {
3119 rfc->retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO);
3120 rfc->monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO);
3121 }
3122 }
3123
3124 static inline void l2cap_txwin_setup(struct l2cap_chan *chan)
3125 {
3126 if (chan->tx_win > L2CAP_DEFAULT_TX_WINDOW &&
3127 __l2cap_ews_supported(chan->conn)) {
3128 /* use extended control field */
3129 set_bit(FLAG_EXT_CTRL, &chan->flags);
3130 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3131 } else {
3132 chan->tx_win = min_t(u16, chan->tx_win,
3133 L2CAP_DEFAULT_TX_WINDOW);
3134 chan->tx_win_max = L2CAP_DEFAULT_TX_WINDOW;
3135 }
3136 chan->ack_win = chan->tx_win;
3137 }
3138
3139 static int l2cap_build_conf_req(struct l2cap_chan *chan, void *data)
3140 {
3141 struct l2cap_conf_req *req = data;
3142 struct l2cap_conf_rfc rfc = { .mode = chan->mode };
3143 void *ptr = req->data;
3144 u16 size;
3145
3146 BT_DBG("chan %p", chan);
3147
3148 if (chan->num_conf_req || chan->num_conf_rsp)
3149 goto done;
3150
3151 switch (chan->mode) {
3152 case L2CAP_MODE_STREAMING:
3153 case L2CAP_MODE_ERTM:
3154 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state))
3155 break;
3156
3157 if (__l2cap_efs_supported(chan->conn))
3158 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3159
3160 /* fall through */
3161 default:
3162 chan->mode = l2cap_select_mode(rfc.mode, chan->conn->feat_mask);
3163 break;
3164 }
3165
3166 done:
3167 if (chan->imtu != L2CAP_DEFAULT_MTU)
3168 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
3169
3170 switch (chan->mode) {
3171 case L2CAP_MODE_BASIC:
3172 if (!(chan->conn->feat_mask & L2CAP_FEAT_ERTM) &&
3173 !(chan->conn->feat_mask & L2CAP_FEAT_STREAMING))
3174 break;
3175
3176 rfc.mode = L2CAP_MODE_BASIC;
3177 rfc.txwin_size = 0;
3178 rfc.max_transmit = 0;
3179 rfc.retrans_timeout = 0;
3180 rfc.monitor_timeout = 0;
3181 rfc.max_pdu_size = 0;
3182
3183 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3184 (unsigned long) &rfc);
3185 break;
3186
3187 case L2CAP_MODE_ERTM:
3188 rfc.mode = L2CAP_MODE_ERTM;
3189 rfc.max_transmit = chan->max_tx;
3190
3191 __l2cap_set_ertm_timeouts(chan, &rfc);
3192
3193 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3194 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3195 L2CAP_FCS_SIZE);
3196 rfc.max_pdu_size = cpu_to_le16(size);
3197
3198 l2cap_txwin_setup(chan);
3199
3200 rfc.txwin_size = min_t(u16, chan->tx_win,
3201 L2CAP_DEFAULT_TX_WINDOW);
3202
3203 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3204 (unsigned long) &rfc);
3205
3206 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3207 l2cap_add_opt_efs(&ptr, chan);
3208
3209 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3210 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3211 chan->tx_win);
3212
3213 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3214 if (chan->fcs == L2CAP_FCS_NONE ||
3215 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3216 chan->fcs = L2CAP_FCS_NONE;
3217 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3218 chan->fcs);
3219 }
3220 break;
3221
3222 case L2CAP_MODE_STREAMING:
3223 l2cap_txwin_setup(chan);
3224 rfc.mode = L2CAP_MODE_STREAMING;
3225 rfc.txwin_size = 0;
3226 rfc.max_transmit = 0;
3227 rfc.retrans_timeout = 0;
3228 rfc.monitor_timeout = 0;
3229
3230 size = min_t(u16, L2CAP_DEFAULT_MAX_PDU_SIZE, chan->conn->mtu -
3231 L2CAP_EXT_HDR_SIZE - L2CAP_SDULEN_SIZE -
3232 L2CAP_FCS_SIZE);
3233 rfc.max_pdu_size = cpu_to_le16(size);
3234
3235 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3236 (unsigned long) &rfc);
3237
3238 if (test_bit(FLAG_EFS_ENABLE, &chan->flags))
3239 l2cap_add_opt_efs(&ptr, chan);
3240
3241 if (chan->conn->feat_mask & L2CAP_FEAT_FCS)
3242 if (chan->fcs == L2CAP_FCS_NONE ||
3243 test_bit(CONF_RECV_NO_FCS, &chan->conf_state)) {
3244 chan->fcs = L2CAP_FCS_NONE;
3245 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1,
3246 chan->fcs);
3247 }
3248 break;
3249 }
3250
3251 req->dcid = cpu_to_le16(chan->dcid);
3252 req->flags = __constant_cpu_to_le16(0);
3253
3254 return ptr - data;
3255 }
3256
3257 static int l2cap_parse_conf_req(struct l2cap_chan *chan, void *data)
3258 {
3259 struct l2cap_conf_rsp *rsp = data;
3260 void *ptr = rsp->data;
3261 void *req = chan->conf_req;
3262 int len = chan->conf_len;
3263 int type, hint, olen;
3264 unsigned long val;
3265 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3266 struct l2cap_conf_efs efs;
3267 u8 remote_efs = 0;
3268 u16 mtu = L2CAP_DEFAULT_MTU;
3269 u16 result = L2CAP_CONF_SUCCESS;
3270 u16 size;
3271
3272 BT_DBG("chan %p", chan);
3273
3274 while (len >= L2CAP_CONF_OPT_SIZE) {
3275 len -= l2cap_get_conf_opt(&req, &type, &olen, &val);
3276
3277 hint = type & L2CAP_CONF_HINT;
3278 type &= L2CAP_CONF_MASK;
3279
3280 switch (type) {
3281 case L2CAP_CONF_MTU:
3282 mtu = val;
3283 break;
3284
3285 case L2CAP_CONF_FLUSH_TO:
3286 chan->flush_to = val;
3287 break;
3288
3289 case L2CAP_CONF_QOS:
3290 break;
3291
3292 case L2CAP_CONF_RFC:
3293 if (olen == sizeof(rfc))
3294 memcpy(&rfc, (void *) val, olen);
3295 break;
3296
3297 case L2CAP_CONF_FCS:
3298 if (val == L2CAP_FCS_NONE)
3299 set_bit(CONF_RECV_NO_FCS, &chan->conf_state);
3300 break;
3301
3302 case L2CAP_CONF_EFS:
3303 remote_efs = 1;
3304 if (olen == sizeof(efs))
3305 memcpy(&efs, (void *) val, olen);
3306 break;
3307
3308 case L2CAP_CONF_EWS:
3309 if (!chan->conn->hs_enabled)
3310 return -ECONNREFUSED;
3311
3312 set_bit(FLAG_EXT_CTRL, &chan->flags);
3313 set_bit(CONF_EWS_RECV, &chan->conf_state);
3314 chan->tx_win_max = L2CAP_DEFAULT_EXT_WINDOW;
3315 chan->remote_tx_win = val;
3316 break;
3317
3318 default:
3319 if (hint)
3320 break;
3321
3322 result = L2CAP_CONF_UNKNOWN;
3323 *((u8 *) ptr++) = type;
3324 break;
3325 }
3326 }
3327
3328 if (chan->num_conf_rsp || chan->num_conf_req > 1)
3329 goto done;
3330
3331 switch (chan->mode) {
3332 case L2CAP_MODE_STREAMING:
3333 case L2CAP_MODE_ERTM:
3334 if (!test_bit(CONF_STATE2_DEVICE, &chan->conf_state)) {
3335 chan->mode = l2cap_select_mode(rfc.mode,
3336 chan->conn->feat_mask);
3337 break;
3338 }
3339
3340 if (remote_efs) {
3341 if (__l2cap_efs_supported(chan->conn))
3342 set_bit(FLAG_EFS_ENABLE, &chan->flags);
3343 else
3344 return -ECONNREFUSED;
3345 }
3346
3347 if (chan->mode != rfc.mode)
3348 return -ECONNREFUSED;
3349
3350 break;
3351 }
3352
3353 done:
3354 if (chan->mode != rfc.mode) {
3355 result = L2CAP_CONF_UNACCEPT;
3356 rfc.mode = chan->mode;
3357
3358 if (chan->num_conf_rsp == 1)
3359 return -ECONNREFUSED;
3360
3361 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3362 (unsigned long) &rfc);
3363 }
3364
3365 if (result == L2CAP_CONF_SUCCESS) {
3366 /* Configure output options and let the other side know
3367 * which ones we don't like. */
3368
3369 if (mtu < L2CAP_DEFAULT_MIN_MTU)
3370 result = L2CAP_CONF_UNACCEPT;
3371 else {
3372 chan->omtu = mtu;
3373 set_bit(CONF_MTU_DONE, &chan->conf_state);
3374 }
3375 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->omtu);
3376
3377 if (remote_efs) {
3378 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3379 efs.stype != L2CAP_SERV_NOTRAFIC &&
3380 efs.stype != chan->local_stype) {
3381
3382 result = L2CAP_CONF_UNACCEPT;
3383
3384 if (chan->num_conf_req >= 1)
3385 return -ECONNREFUSED;
3386
3387 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3388 sizeof(efs),
3389 (unsigned long) &efs);
3390 } else {
3391 /* Send PENDING Conf Rsp */
3392 result = L2CAP_CONF_PENDING;
3393 set_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3394 }
3395 }
3396
3397 switch (rfc.mode) {
3398 case L2CAP_MODE_BASIC:
3399 chan->fcs = L2CAP_FCS_NONE;
3400 set_bit(CONF_MODE_DONE, &chan->conf_state);
3401 break;
3402
3403 case L2CAP_MODE_ERTM:
3404 if (!test_bit(CONF_EWS_RECV, &chan->conf_state))
3405 chan->remote_tx_win = rfc.txwin_size;
3406 else
3407 rfc.txwin_size = L2CAP_DEFAULT_TX_WINDOW;
3408
3409 chan->remote_max_tx = rfc.max_transmit;
3410
3411 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3412 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3413 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3414 rfc.max_pdu_size = cpu_to_le16(size);
3415 chan->remote_mps = size;
3416
3417 __l2cap_set_ertm_timeouts(chan, &rfc);
3418
3419 set_bit(CONF_MODE_DONE, &chan->conf_state);
3420
3421 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3422 sizeof(rfc), (unsigned long) &rfc);
3423
3424 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3425 chan->remote_id = efs.id;
3426 chan->remote_stype = efs.stype;
3427 chan->remote_msdu = le16_to_cpu(efs.msdu);
3428 chan->remote_flush_to =
3429 le32_to_cpu(efs.flush_to);
3430 chan->remote_acc_lat =
3431 le32_to_cpu(efs.acc_lat);
3432 chan->remote_sdu_itime =
3433 le32_to_cpu(efs.sdu_itime);
3434 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS,
3435 sizeof(efs),
3436 (unsigned long) &efs);
3437 }
3438 break;
3439
3440 case L2CAP_MODE_STREAMING:
3441 size = min_t(u16, le16_to_cpu(rfc.max_pdu_size),
3442 chan->conn->mtu - L2CAP_EXT_HDR_SIZE -
3443 L2CAP_SDULEN_SIZE - L2CAP_FCS_SIZE);
3444 rfc.max_pdu_size = cpu_to_le16(size);
3445 chan->remote_mps = size;
3446
3447 set_bit(CONF_MODE_DONE, &chan->conf_state);
3448
3449 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc),
3450 (unsigned long) &rfc);
3451
3452 break;
3453
3454 default:
3455 result = L2CAP_CONF_UNACCEPT;
3456
3457 memset(&rfc, 0, sizeof(rfc));
3458 rfc.mode = chan->mode;
3459 }
3460
3461 if (result == L2CAP_CONF_SUCCESS)
3462 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3463 }
3464 rsp->scid = cpu_to_le16(chan->dcid);
3465 rsp->result = cpu_to_le16(result);
3466 rsp->flags = __constant_cpu_to_le16(0);
3467
3468 return ptr - data;
3469 }
3470
3471 static int l2cap_parse_conf_rsp(struct l2cap_chan *chan, void *rsp, int len,
3472 void *data, u16 *result)
3473 {
3474 struct l2cap_conf_req *req = data;
3475 void *ptr = req->data;
3476 int type, olen;
3477 unsigned long val;
3478 struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC };
3479 struct l2cap_conf_efs efs;
3480
3481 BT_DBG("chan %p, rsp %p, len %d, req %p", chan, rsp, len, data);
3482
3483 while (len >= L2CAP_CONF_OPT_SIZE) {
3484 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3485
3486 switch (type) {
3487 case L2CAP_CONF_MTU:
3488 if (val < L2CAP_DEFAULT_MIN_MTU) {
3489 *result = L2CAP_CONF_UNACCEPT;
3490 chan->imtu = L2CAP_DEFAULT_MIN_MTU;
3491 } else
3492 chan->imtu = val;
3493 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, chan->imtu);
3494 break;
3495
3496 case L2CAP_CONF_FLUSH_TO:
3497 chan->flush_to = val;
3498 l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO,
3499 2, chan->flush_to);
3500 break;
3501
3502 case L2CAP_CONF_RFC:
3503 if (olen == sizeof(rfc))
3504 memcpy(&rfc, (void *)val, olen);
3505
3506 if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
3507 rfc.mode != chan->mode)
3508 return -ECONNREFUSED;
3509
3510 chan->fcs = 0;
3511
3512 l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
3513 sizeof(rfc), (unsigned long) &rfc);
3514 break;
3515
3516 case L2CAP_CONF_EWS:
3517 chan->ack_win = min_t(u16, val, chan->ack_win);
3518 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EWS, 2,
3519 chan->tx_win);
3520 break;
3521
3522 case L2CAP_CONF_EFS:
3523 if (olen == sizeof(efs))
3524 memcpy(&efs, (void *)val, olen);
3525
3526 if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
3527 efs.stype != L2CAP_SERV_NOTRAFIC &&
3528 efs.stype != chan->local_stype)
3529 return -ECONNREFUSED;
3530
3531 l2cap_add_conf_opt(&ptr, L2CAP_CONF_EFS, sizeof(efs),
3532 (unsigned long) &efs);
3533 break;
3534
3535 case L2CAP_CONF_FCS:
3536 if (*result == L2CAP_CONF_PENDING)
3537 if (val == L2CAP_FCS_NONE)
3538 set_bit(CONF_RECV_NO_FCS,
3539 &chan->conf_state);
3540 break;
3541 }
3542 }
3543
3544 if (chan->mode == L2CAP_MODE_BASIC && chan->mode != rfc.mode)
3545 return -ECONNREFUSED;
3546
3547 chan->mode = rfc.mode;
3548
3549 if (*result == L2CAP_CONF_SUCCESS || *result == L2CAP_CONF_PENDING) {
3550 switch (rfc.mode) {
3551 case L2CAP_MODE_ERTM:
3552 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3553 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3554 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3555 if (!test_bit(FLAG_EXT_CTRL, &chan->flags))
3556 chan->ack_win = min_t(u16, chan->ack_win,
3557 rfc.txwin_size);
3558
3559 if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
3560 chan->local_msdu = le16_to_cpu(efs.msdu);
3561 chan->local_sdu_itime =
3562 le32_to_cpu(efs.sdu_itime);
3563 chan->local_acc_lat = le32_to_cpu(efs.acc_lat);
3564 chan->local_flush_to =
3565 le32_to_cpu(efs.flush_to);
3566 }
3567 break;
3568
3569 case L2CAP_MODE_STREAMING:
3570 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3571 }
3572 }
3573
3574 req->dcid = cpu_to_le16(chan->dcid);
3575 req->flags = __constant_cpu_to_le16(0);
3576
3577 return ptr - data;
3578 }
3579
3580 static int l2cap_build_conf_rsp(struct l2cap_chan *chan, void *data,
3581 u16 result, u16 flags)
3582 {
3583 struct l2cap_conf_rsp *rsp = data;
3584 void *ptr = rsp->data;
3585
3586 BT_DBG("chan %p", chan);
3587
3588 rsp->scid = cpu_to_le16(chan->dcid);
3589 rsp->result = cpu_to_le16(result);
3590 rsp->flags = cpu_to_le16(flags);
3591
3592 return ptr - data;
3593 }
3594
3595 void __l2cap_connect_rsp_defer(struct l2cap_chan *chan)
3596 {
3597 struct l2cap_conn_rsp rsp;
3598 struct l2cap_conn *conn = chan->conn;
3599 u8 buf[128];
3600 u8 rsp_code;
3601
3602 rsp.scid = cpu_to_le16(chan->dcid);
3603 rsp.dcid = cpu_to_le16(chan->scid);
3604 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
3605 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
3606
3607 if (chan->hs_hcon)
3608 rsp_code = L2CAP_CREATE_CHAN_RSP;
3609 else
3610 rsp_code = L2CAP_CONN_RSP;
3611
3612 BT_DBG("chan %p rsp_code %u", chan, rsp_code);
3613
3614 l2cap_send_cmd(conn, chan->ident, rsp_code, sizeof(rsp), &rsp);
3615
3616 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3617 return;
3618
3619 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3620 l2cap_build_conf_req(chan, buf), buf);
3621 chan->num_conf_req++;
3622 }
3623
3624 static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
3625 {
3626 int type, olen;
3627 unsigned long val;
3628 /* Use sane default values in case a misbehaving remote device
3629 * did not send an RFC or extended window size option.
3630 */
3631 u16 txwin_ext = chan->ack_win;
3632 struct l2cap_conf_rfc rfc = {
3633 .mode = chan->mode,
3634 .retrans_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_RETRANS_TO),
3635 .monitor_timeout = __constant_cpu_to_le16(L2CAP_DEFAULT_MONITOR_TO),
3636 .max_pdu_size = cpu_to_le16(chan->imtu),
3637 .txwin_size = min_t(u16, chan->ack_win, L2CAP_DEFAULT_TX_WINDOW),
3638 };
3639
3640 BT_DBG("chan %p, rsp %p, len %d", chan, rsp, len);
3641
3642 if ((chan->mode != L2CAP_MODE_ERTM) && (chan->mode != L2CAP_MODE_STREAMING))
3643 return;
3644
3645 while (len >= L2CAP_CONF_OPT_SIZE) {
3646 len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
3647
3648 switch (type) {
3649 case L2CAP_CONF_RFC:
3650 if (olen == sizeof(rfc))
3651 memcpy(&rfc, (void *)val, olen);
3652 break;
3653 case L2CAP_CONF_EWS:
3654 txwin_ext = val;
3655 break;
3656 }
3657 }
3658
3659 switch (rfc.mode) {
3660 case L2CAP_MODE_ERTM:
3661 chan->retrans_timeout = le16_to_cpu(rfc.retrans_timeout);
3662 chan->monitor_timeout = le16_to_cpu(rfc.monitor_timeout);
3663 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3664 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
3665 chan->ack_win = min_t(u16, chan->ack_win, txwin_ext);
3666 else
3667 chan->ack_win = min_t(u16, chan->ack_win,
3668 rfc.txwin_size);
3669 break;
3670 case L2CAP_MODE_STREAMING:
3671 chan->mps = le16_to_cpu(rfc.max_pdu_size);
3672 }
3673 }
3674
3675 static inline int l2cap_command_rej(struct l2cap_conn *conn,
3676 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3677 u8 *data)
3678 {
3679 struct l2cap_cmd_rej_unk *rej = (struct l2cap_cmd_rej_unk *) data;
3680
3681 if (cmd_len < sizeof(*rej))
3682 return -EPROTO;
3683
3684 if (rej->reason != L2CAP_REJ_NOT_UNDERSTOOD)
3685 return 0;
3686
3687 if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) &&
3688 cmd->ident == conn->info_ident) {
3689 cancel_delayed_work(&conn->info_timer);
3690
3691 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
3692 conn->info_ident = 0;
3693
3694 l2cap_conn_start(conn);
3695 }
3696
3697 return 0;
3698 }
3699
3700 static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn,
3701 struct l2cap_cmd_hdr *cmd,
3702 u8 *data, u8 rsp_code, u8 amp_id)
3703 {
3704 struct l2cap_conn_req *req = (struct l2cap_conn_req *) data;
3705 struct l2cap_conn_rsp rsp;
3706 struct l2cap_chan *chan = NULL, *pchan;
3707 int result, status = L2CAP_CS_NO_INFO;
3708
3709 u16 dcid = 0, scid = __le16_to_cpu(req->scid);
3710 __le16 psm = req->psm;
3711
3712 BT_DBG("psm 0x%2.2x scid 0x%4.4x", __le16_to_cpu(psm), scid);
3713
3714 /* Check if we have socket listening on psm */
3715 pchan = l2cap_global_chan_by_psm(BT_LISTEN, psm, &conn->hcon->src,
3716 &conn->hcon->dst);
3717 if (!pchan) {
3718 result = L2CAP_CR_BAD_PSM;
3719 goto sendresp;
3720 }
3721
3722 mutex_lock(&conn->chan_lock);
3723 l2cap_chan_lock(pchan);
3724
3725 /* Check if the ACL is secure enough (if not SDP) */
3726 if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) &&
3727 !hci_conn_check_link_mode(conn->hcon)) {
3728 conn->disc_reason = HCI_ERROR_AUTH_FAILURE;
3729 result = L2CAP_CR_SEC_BLOCK;
3730 goto response;
3731 }
3732
3733 result = L2CAP_CR_NO_MEM;
3734
3735 /* Check if we already have channel with that dcid */
3736 if (__l2cap_get_chan_by_dcid(conn, scid))
3737 goto response;
3738
3739 chan = pchan->ops->new_connection(pchan);
3740 if (!chan)
3741 goto response;
3742
3743 /* For certain devices (ex: HID mouse), support for authentication,
3744 * pairing and bonding is optional. For such devices, inorder to avoid
3745 * the ACL alive for too long after L2CAP disconnection, reset the ACL
3746 * disc_timeout back to HCI_DISCONN_TIMEOUT during L2CAP connect.
3747 */
3748 conn->hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
3749
3750 bacpy(&chan->src, &conn->hcon->src);
3751 bacpy(&chan->dst, &conn->hcon->dst);
3752 chan->src_type = bdaddr_type(conn->hcon, conn->hcon->src_type);
3753 chan->dst_type = bdaddr_type(conn->hcon, conn->hcon->dst_type);
3754 chan->psm = psm;
3755 chan->dcid = scid;
3756 chan->local_amp_id = amp_id;
3757
3758 __l2cap_chan_add(conn, chan);
3759
3760 dcid = chan->scid;
3761
3762 __set_chan_timer(chan, chan->ops->get_sndtimeo(chan));
3763
3764 chan->ident = cmd->ident;
3765
3766 if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) {
3767 if (l2cap_chan_check_security(chan)) {
3768 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
3769 l2cap_state_change(chan, BT_CONNECT2);
3770 result = L2CAP_CR_PEND;
3771 status = L2CAP_CS_AUTHOR_PEND;
3772 chan->ops->defer(chan);
3773 } else {
3774 /* Force pending result for AMP controllers.
3775 * The connection will succeed after the
3776 * physical link is up.
3777 */
3778 if (amp_id == AMP_ID_BREDR) {
3779 l2cap_state_change(chan, BT_CONFIG);
3780 result = L2CAP_CR_SUCCESS;
3781 } else {
3782 l2cap_state_change(chan, BT_CONNECT2);
3783 result = L2CAP_CR_PEND;
3784 }
3785 status = L2CAP_CS_NO_INFO;
3786 }
3787 } else {
3788 l2cap_state_change(chan, BT_CONNECT2);
3789 result = L2CAP_CR_PEND;
3790 status = L2CAP_CS_AUTHEN_PEND;
3791 }
3792 } else {
3793 l2cap_state_change(chan, BT_CONNECT2);
3794 result = L2CAP_CR_PEND;
3795 status = L2CAP_CS_NO_INFO;
3796 }
3797
3798 response:
3799 l2cap_chan_unlock(pchan);
3800 mutex_unlock(&conn->chan_lock);
3801
3802 sendresp:
3803 rsp.scid = cpu_to_le16(scid);
3804 rsp.dcid = cpu_to_le16(dcid);
3805 rsp.result = cpu_to_le16(result);
3806 rsp.status = cpu_to_le16(status);
3807 l2cap_send_cmd(conn, cmd->ident, rsp_code, sizeof(rsp), &rsp);
3808
3809 if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) {
3810 struct l2cap_info_req info;
3811 info.type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
3812
3813 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT;
3814 conn->info_ident = l2cap_get_ident(conn);
3815
3816 schedule_delayed_work(&conn->info_timer, L2CAP_INFO_TIMEOUT);
3817
3818 l2cap_send_cmd(conn, conn->info_ident, L2CAP_INFO_REQ,
3819 sizeof(info), &info);
3820 }
3821
3822 if (chan && !test_bit(CONF_REQ_SENT, &chan->conf_state) &&
3823 result == L2CAP_CR_SUCCESS) {
3824 u8 buf[128];
3825 set_bit(CONF_REQ_SENT, &chan->conf_state);
3826 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3827 l2cap_build_conf_req(chan, buf), buf);
3828 chan->num_conf_req++;
3829 }
3830
3831 return chan;
3832 }
3833
3834 static int l2cap_connect_req(struct l2cap_conn *conn,
3835 struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data)
3836 {
3837 struct hci_dev *hdev = conn->hcon->hdev;
3838 struct hci_conn *hcon = conn->hcon;
3839
3840 if (cmd_len < sizeof(struct l2cap_conn_req))
3841 return -EPROTO;
3842
3843 hci_dev_lock(hdev);
3844 if (test_bit(HCI_MGMT, &hdev->dev_flags) &&
3845 !test_and_set_bit(HCI_CONN_MGMT_CONNECTED, &hcon->flags))
3846 mgmt_device_connected(hdev, &hcon->dst, hcon->type,
3847 hcon->dst_type, 0, NULL, 0,
3848 hcon->dev_class);
3849 hci_dev_unlock(hdev);
3850
3851 l2cap_connect(conn, cmd, data, L2CAP_CONN_RSP, 0);
3852 return 0;
3853 }
3854
3855 static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
3856 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3857 u8 *data)
3858 {
3859 struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data;
3860 u16 scid, dcid, result, status;
3861 struct l2cap_chan *chan;
3862 u8 req[128];
3863 int err;
3864
3865 if (cmd_len < sizeof(*rsp))
3866 return -EPROTO;
3867
3868 scid = __le16_to_cpu(rsp->scid);
3869 dcid = __le16_to_cpu(rsp->dcid);
3870 result = __le16_to_cpu(rsp->result);
3871 status = __le16_to_cpu(rsp->status);
3872
3873 BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
3874 dcid, scid, result, status);
3875
3876 mutex_lock(&conn->chan_lock);
3877
3878 if (scid) {
3879 chan = __l2cap_get_chan_by_scid(conn, scid);
3880 if (!chan) {
3881 err = -EBADSLT;
3882 goto unlock;
3883 }
3884 } else {
3885 chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
3886 if (!chan) {
3887 err = -EBADSLT;
3888 goto unlock;
3889 }
3890 }
3891
3892 err = 0;
3893
3894 l2cap_chan_lock(chan);
3895
3896 switch (result) {
3897 case L2CAP_CR_SUCCESS:
3898 l2cap_state_change(chan, BT_CONFIG);
3899 chan->ident = 0;
3900 chan->dcid = dcid;
3901 clear_bit(CONF_CONNECT_PEND, &chan->conf_state);
3902
3903 if (test_and_set_bit(CONF_REQ_SENT, &chan->conf_state))
3904 break;
3905
3906 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
3907 l2cap_build_conf_req(chan, req), req);
3908 chan->num_conf_req++;
3909 break;
3910
3911 case L2CAP_CR_PEND:
3912 set_bit(CONF_CONNECT_PEND, &chan->conf_state);
3913 break;
3914
3915 default:
3916 l2cap_chan_del(chan, ECONNREFUSED);
3917 break;
3918 }
3919
3920 l2cap_chan_unlock(chan);
3921
3922 unlock:
3923 mutex_unlock(&conn->chan_lock);
3924
3925 return err;
3926 }
3927
3928 static inline void set_default_fcs(struct l2cap_chan *chan)
3929 {
3930 /* FCS is enabled only in ERTM or streaming mode, if one or both
3931 * sides request it.
3932 */
3933 if (chan->mode != L2CAP_MODE_ERTM && chan->mode != L2CAP_MODE_STREAMING)
3934 chan->fcs = L2CAP_FCS_NONE;
3935 else if (!test_bit(CONF_RECV_NO_FCS, &chan->conf_state))
3936 chan->fcs = L2CAP_FCS_CRC16;
3937 }
3938
3939 static void l2cap_send_efs_conf_rsp(struct l2cap_chan *chan, void *data,
3940 u8 ident, u16 flags)
3941 {
3942 struct l2cap_conn *conn = chan->conn;
3943
3944 BT_DBG("conn %p chan %p ident %d flags 0x%4.4x", conn, chan, ident,
3945 flags);
3946
3947 clear_bit(CONF_LOC_CONF_PEND, &chan->conf_state);
3948 set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
3949
3950 l2cap_send_cmd(conn, ident, L2CAP_CONF_RSP,
3951 l2cap_build_conf_rsp(chan, data,
3952 L2CAP_CONF_SUCCESS, flags), data);
3953 }
3954
3955 static void cmd_reject_invalid_cid(struct l2cap_conn *conn, u8 ident,
3956 u16 scid, u16 dcid)
3957 {
3958 struct l2cap_cmd_rej_cid rej;
3959
3960 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_INVALID_CID);
3961 rej.scid = __cpu_to_le16(scid);
3962 rej.dcid = __cpu_to_le16(dcid);
3963
3964 l2cap_send_cmd(conn, ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej);
3965 }
3966
3967 static inline int l2cap_config_req(struct l2cap_conn *conn,
3968 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
3969 u8 *data)
3970 {
3971 struct l2cap_conf_req *req = (struct l2cap_conf_req *) data;
3972 u16 dcid, flags;
3973 u8 rsp[64];
3974 struct l2cap_chan *chan;
3975 int len, err = 0;
3976
3977 if (cmd_len < sizeof(*req))
3978 return -EPROTO;
3979
3980 dcid = __le16_to_cpu(req->dcid);
3981 flags = __le16_to_cpu(req->flags);
3982
3983 BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags);
3984
3985 chan = l2cap_get_chan_by_scid(conn, dcid);
3986 if (!chan) {
3987 cmd_reject_invalid_cid(conn, cmd->ident, dcid, 0);
3988 return 0;
3989 }
3990
3991 if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
3992 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
3993 chan->dcid);
3994 goto unlock;
3995 }
3996
3997 /* Reject if config buffer is too small. */
3998 len = cmd_len - sizeof(*req);
3999 if (chan->conf_len + len > sizeof(chan->conf_req)) {
4000 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4001 l2cap_build_conf_rsp(chan, rsp,
4002 L2CAP_CONF_REJECT, flags), rsp);
4003 goto unlock;
4004 }
4005
4006 /* Store config. */
4007 memcpy(chan->conf_req + chan->conf_len, req->data, len);
4008 chan->conf_len += len;
4009
4010 if (flags & L2CAP_CONF_FLAG_CONTINUATION) {
4011 /* Incomplete config. Send empty response. */
4012 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP,
4013 l2cap_build_conf_rsp(chan, rsp,
4014 L2CAP_CONF_SUCCESS, flags), rsp);
4015 goto unlock;
4016 }
4017
4018 /* Complete config. */
4019 len = l2cap_parse_conf_req(chan, rsp);
4020 if (len < 0) {
4021 l2cap_send_disconn_req(chan, ECONNRESET);
4022 goto unlock;
4023 }
4024
4025 chan->ident = cmd->ident;
4026 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
4027 chan->num_conf_rsp++;
4028
4029 /* Reset config buffer. */
4030 chan->conf_len = 0;
4031
4032 if (!test_bit(CONF_OUTPUT_DONE, &chan->conf_state))
4033 goto unlock;
4034
4035 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4036 set_default_fcs(chan);
4037
4038 if (chan->mode == L2CAP_MODE_ERTM ||
4039 chan->mode == L2CAP_MODE_STREAMING)
4040 err = l2cap_ertm_init(chan);
4041
4042 if (err < 0)
4043 l2cap_send_disconn_req(chan, -err);
4044 else
4045 l2cap_chan_ready(chan);
4046
4047 goto unlock;
4048 }
4049
4050 if (!test_and_set_bit(CONF_REQ_SENT, &chan->conf_state)) {
4051 u8 buf[64];
4052 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
4053 l2cap_build_conf_req(chan, buf), buf);
4054 chan->num_conf_req++;
4055 }
4056
4057 /* Got Conf Rsp PENDING from remote side and asume we sent
4058 Conf Rsp PENDING in the code above */
4059 if (test_bit(CONF_REM_CONF_PEND, &chan->conf_state) &&
4060 test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4061
4062 /* check compatibility */
4063
4064 /* Send rsp for BR/EDR channel */
4065 if (!chan->hs_hcon)
4066 l2cap_send_efs_conf_rsp(chan, rsp, cmd->ident, flags);
4067 else
4068 chan->ident = cmd->ident;
4069 }
4070
4071 unlock:
4072 l2cap_chan_unlock(chan);
4073 return err;
4074 }
4075
4076 static inline int l2cap_config_rsp(struct l2cap_conn *conn,
4077 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4078 u8 *data)
4079 {
4080 struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data;
4081 u16 scid, flags, result;
4082 struct l2cap_chan *chan;
4083 int len = cmd_len - sizeof(*rsp);
4084 int err = 0;
4085
4086 if (cmd_len < sizeof(*rsp))
4087 return -EPROTO;
4088
4089 scid = __le16_to_cpu(rsp->scid);
4090 flags = __le16_to_cpu(rsp->flags);
4091 result = __le16_to_cpu(rsp->result);
4092
4093 BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
4094 result, len);
4095
4096 chan = l2cap_get_chan_by_scid(conn, scid);
4097 if (!chan)
4098 return 0;
4099
4100 switch (result) {
4101 case L2CAP_CONF_SUCCESS:
4102 l2cap_conf_rfc_get(chan, rsp->data, len);
4103 clear_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4104 break;
4105
4106 case L2CAP_CONF_PENDING:
4107 set_bit(CONF_REM_CONF_PEND, &chan->conf_state);
4108
4109 if (test_bit(CONF_LOC_CONF_PEND, &chan->conf_state)) {
4110 char buf[64];
4111
4112 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4113 buf, &result);
4114 if (len < 0) {
4115 l2cap_send_disconn_req(chan, ECONNRESET);
4116 goto done;
4117 }
4118
4119 if (!chan->hs_hcon) {
4120 l2cap_send_efs_conf_rsp(chan, buf, cmd->ident,
4121 0);
4122 } else {
4123 if (l2cap_check_efs(chan)) {
4124 amp_create_logical_link(chan);
4125 chan->ident = cmd->ident;
4126 }
4127 }
4128 }
4129 goto done;
4130
4131 case L2CAP_CONF_UNACCEPT:
4132 if (chan->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) {
4133 char req[64];
4134
4135 if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
4136 l2cap_send_disconn_req(chan, ECONNRESET);
4137 goto done;
4138 }
4139
4140 /* throw out any old stored conf requests */
4141 result = L2CAP_CONF_SUCCESS;
4142 len = l2cap_parse_conf_rsp(chan, rsp->data, len,
4143 req, &result);
4144 if (len < 0) {
4145 l2cap_send_disconn_req(chan, ECONNRESET);
4146 goto done;
4147 }
4148
4149 l2cap_send_cmd(conn, l2cap_get_ident(conn),
4150 L2CAP_CONF_REQ, len, req);
4151 chan->num_conf_req++;
4152 if (result != L2CAP_CONF_SUCCESS)
4153 goto done;
4154 break;
4155 }
4156
4157 default:
4158 l2cap_chan_set_err(chan, ECONNRESET);
4159
4160 __set_chan_timer(chan, L2CAP_DISC_REJ_TIMEOUT);
4161 l2cap_send_disconn_req(chan, ECONNRESET);
4162 goto done;
4163 }
4164
4165 if (flags & L2CAP_CONF_FLAG_CONTINUATION)
4166 goto done;
4167
4168 set_bit(CONF_INPUT_DONE, &chan->conf_state);
4169
4170 if (test_bit(CONF_OUTPUT_DONE, &chan->conf_state)) {
4171 set_default_fcs(chan);
4172
4173 if (chan->mode == L2CAP_MODE_ERTM ||
4174 chan->mode == L2CAP_MODE_STREAMING)
4175 err = l2cap_ertm_init(chan);
4176
4177 if (err < 0)
4178 l2cap_send_disconn_req(chan, -err);
4179 else
4180 l2cap_chan_ready(chan);
4181 }
4182
4183 done:
4184 l2cap_chan_unlock(chan);
4185 return err;
4186 }
4187
4188 static inline int l2cap_disconnect_req(struct l2cap_conn *conn,
4189 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4190 u8 *data)
4191 {
4192 struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data;
4193 struct l2cap_disconn_rsp rsp;
4194 u16 dcid, scid;
4195 struct l2cap_chan *chan;
4196
4197 if (cmd_len != sizeof(*req))
4198 return -EPROTO;
4199
4200 scid = __le16_to_cpu(req->scid);
4201 dcid = __le16_to_cpu(req->dcid);
4202
4203 BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
4204
4205 mutex_lock(&conn->chan_lock);
4206
4207 chan = __l2cap_get_chan_by_scid(conn, dcid);
4208 if (!chan) {
4209 mutex_unlock(&conn->chan_lock);
4210 cmd_reject_invalid_cid(conn, cmd->ident, dcid, scid);
4211 return 0;
4212 }
4213
4214 l2cap_chan_lock(chan);
4215
4216 rsp.dcid = cpu_to_le16(chan->scid);
4217 rsp.scid = cpu_to_le16(chan->dcid);
4218 l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp);
4219
4220 chan->ops->set_shutdown(chan);
4221
4222 l2cap_chan_hold(chan);
4223 l2cap_chan_del(chan, ECONNRESET);
4224
4225 l2cap_chan_unlock(chan);
4226
4227 chan->ops->close(chan);
4228 l2cap_chan_put(chan);
4229
4230 mutex_unlock(&conn->chan_lock);
4231
4232 return 0;
4233 }
4234
4235 static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
4236 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4237 u8 *data)
4238 {
4239 struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data;
4240 u16 dcid, scid;
4241 struct l2cap_chan *chan;
4242
4243 if (cmd_len != sizeof(*rsp))
4244 return -EPROTO;
4245
4246 scid = __le16_to_cpu(rsp->scid);
4247 dcid = __le16_to_cpu(rsp->dcid);
4248
4249 BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
4250
4251 mutex_lock(&conn->chan_lock);
4252
4253 chan = __l2cap_get_chan_by_scid(conn, scid);
4254 if (!chan) {
4255 mutex_unlock(&conn->chan_lock);
4256 return 0;
4257 }
4258
4259 l2cap_chan_lock(chan);
4260
4261 l2cap_chan_hold(chan);
4262 l2cap_chan_del(chan, 0);
4263
4264 l2cap_chan_unlock(chan);
4265
4266 chan->ops->close(chan);
4267 l2cap_chan_put(chan);
4268
4269 mutex_unlock(&conn->chan_lock);
4270
4271 return 0;
4272 }
4273
4274 static inline int l2cap_information_req(struct l2cap_conn *conn,
4275 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4276 u8 *data)
4277 {
4278 struct l2cap_info_req *req = (struct l2cap_info_req *) data;
4279 u16 type;
4280
4281 if (cmd_len != sizeof(*req))
4282 return -EPROTO;
4283
4284 type = __le16_to_cpu(req->type);
4285
4286 BT_DBG("type 0x%4.4x", type);
4287
4288 if (type == L2CAP_IT_FEAT_MASK) {
4289 u8 buf[8];
4290 u32 feat_mask = l2cap_feat_mask;
4291 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4292 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FEAT_MASK);
4293 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
4294 if (!disable_ertm)
4295 feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING
4296 | L2CAP_FEAT_FCS;
4297 if (conn->hs_enabled)
4298 feat_mask |= L2CAP_FEAT_EXT_FLOW
4299 | L2CAP_FEAT_EXT_WINDOW;
4300
4301 put_unaligned_le32(feat_mask, rsp->data);
4302 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4303 buf);
4304 } else if (type == L2CAP_IT_FIXED_CHAN) {
4305 u8 buf[12];
4306 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
4307
4308 if (conn->hs_enabled)
4309 l2cap_fixed_chan[0] |= L2CAP_FC_A2MP;
4310 else
4311 l2cap_fixed_chan[0] &= ~L2CAP_FC_A2MP;
4312
4313 rsp->type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4314 rsp->result = __constant_cpu_to_le16(L2CAP_IR_SUCCESS);
4315 memcpy(rsp->data, l2cap_fixed_chan, sizeof(l2cap_fixed_chan));
4316 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(buf),
4317 buf);
4318 } else {
4319 struct l2cap_info_rsp rsp;
4320 rsp.type = cpu_to_le16(type);
4321 rsp.result = __constant_cpu_to_le16(L2CAP_IR_NOTSUPP);
4322 l2cap_send_cmd(conn, cmd->ident, L2CAP_INFO_RSP, sizeof(rsp),
4323 &rsp);
4324 }
4325
4326 return 0;
4327 }
4328
4329 static inline int l2cap_information_rsp(struct l2cap_conn *conn,
4330 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
4331 u8 *data)
4332 {
4333 struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data;
4334 u16 type, result;
4335
4336 if (cmd_len < sizeof(*rsp))
4337 return -EPROTO;
4338
4339 type = __le16_to_cpu(rsp->type);
4340 result = __le16_to_cpu(rsp->result);
4341
4342 BT_DBG("type 0x%4.4x result 0x%2.2x", type, result);
4343
4344 /* L2CAP Info req/rsp are unbound to channels, add extra checks */
4345 if (cmd->ident != conn->info_ident ||
4346 conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)
4347 return 0;
4348
4349 cancel_delayed_work(&conn->info_timer);
4350
4351 if (result != L2CAP_IR_SUCCESS) {
4352 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4353 conn->info_ident = 0;
4354
4355 l2cap_conn_start(conn);
4356
4357 return 0;
4358 }
4359
4360 switch (type) {
4361 case L2CAP_IT_FEAT_MASK:
4362 conn->feat_mask = get_unaligned_le32(rsp->data);
4363
4364 if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) {
4365 struct l2cap_info_req req;
4366 req.type = __constant_cpu_to_le16(L2CAP_IT_FIXED_CHAN);
4367
4368 conn->info_ident = l2cap_get_ident(conn);
4369
4370 l2cap_send_cmd(conn, conn->info_ident,
4371 L2CAP_INFO_REQ, sizeof(req), &req);
4372 } else {
4373 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4374 conn->info_ident = 0;
4375
4376 l2cap_conn_start(conn);
4377 }
4378 break;
4379
4380 case L2CAP_IT_FIXED_CHAN:
4381 conn->fixed_chan_mask = rsp->data[0];
4382 conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE;
4383 conn->info_ident = 0;
4384
4385 l2cap_conn_start(conn);
4386 break;
4387 }
4388
4389 return 0;
4390 }
4391
4392 static int l2cap_create_channel_req(struct l2cap_conn *conn,
4393 struct l2cap_cmd_hdr *cmd,
4394 u16 cmd_len, void *data)
4395 {
4396 struct l2cap_create_chan_req *req = data;
4397 struct l2cap_create_chan_rsp rsp;
4398 struct l2cap_chan *chan;
4399 struct hci_dev *hdev;
4400 u16 psm, scid;
4401
4402 if (cmd_len != sizeof(*req))
4403 return -EPROTO;
4404
4405 if (!conn->hs_enabled)
4406 return -EINVAL;
4407
4408 psm = le16_to_cpu(req->psm);
4409 scid = le16_to_cpu(req->scid);
4410
4411 BT_DBG("psm 0x%2.2x, scid 0x%4.4x, amp_id %d", psm, scid, req->amp_id);
4412
4413 /* For controller id 0 make BR/EDR connection */
4414 if (req->amp_id == AMP_ID_BREDR) {
4415 l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4416 req->amp_id);
4417 return 0;
4418 }
4419
4420 /* Validate AMP controller id */
4421 hdev = hci_dev_get(req->amp_id);
4422 if (!hdev)
4423 goto error;
4424
4425 if (hdev->dev_type != HCI_AMP || !test_bit(HCI_UP, &hdev->flags)) {
4426 hci_dev_put(hdev);
4427 goto error;
4428 }
4429
4430 chan = l2cap_connect(conn, cmd, data, L2CAP_CREATE_CHAN_RSP,
4431 req->amp_id);
4432 if (chan) {
4433 struct amp_mgr *mgr = conn->hcon->amp_mgr;
4434 struct hci_conn *hs_hcon;
4435
4436 hs_hcon = hci_conn_hash_lookup_ba(hdev, AMP_LINK,
4437 &conn->hcon->dst);
4438 if (!hs_hcon) {
4439 hci_dev_put(hdev);
4440 cmd_reject_invalid_cid(conn, cmd->ident, chan->scid,
4441 chan->dcid);
4442 return 0;
4443 }
4444
4445 BT_DBG("mgr %p bredr_chan %p hs_hcon %p", mgr, chan, hs_hcon);
4446
4447 mgr->bredr_chan = chan;
4448 chan->hs_hcon = hs_hcon;
4449 chan->fcs = L2CAP_FCS_NONE;
4450 conn->mtu = hdev->block_mtu;
4451 }
4452
4453 hci_dev_put(hdev);
4454
4455 return 0;
4456
4457 error:
4458 rsp.dcid = 0;
4459 rsp.scid = cpu_to_le16(scid);
4460 rsp.result = __constant_cpu_to_le16(L2CAP_CR_BAD_AMP);
4461 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4462
4463 l2cap_send_cmd(conn, cmd->ident, L2CAP_CREATE_CHAN_RSP,
4464 sizeof(rsp), &rsp);
4465
4466 return 0;
4467 }
4468
4469 static void l2cap_send_move_chan_req(struct l2cap_chan *chan, u8 dest_amp_id)
4470 {
4471 struct l2cap_move_chan_req req;
4472 u8 ident;
4473
4474 BT_DBG("chan %p, dest_amp_id %d", chan, dest_amp_id);
4475
4476 ident = l2cap_get_ident(chan->conn);
4477 chan->ident = ident;
4478
4479 req.icid = cpu_to_le16(chan->scid);
4480 req.dest_amp_id = dest_amp_id;
4481
4482 l2cap_send_cmd(chan->conn, ident, L2CAP_MOVE_CHAN_REQ, sizeof(req),
4483 &req);
4484
4485 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4486 }
4487
4488 static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
4489 {
4490 struct l2cap_move_chan_rsp rsp;
4491
4492 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4493
4494 rsp.icid = cpu_to_le16(chan->dcid);
4495 rsp.result = cpu_to_le16(result);
4496
4497 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
4498 sizeof(rsp), &rsp);
4499 }
4500
4501 static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
4502 {
4503 struct l2cap_move_chan_cfm cfm;
4504
4505 BT_DBG("chan %p, result 0x%4.4x", chan, result);
4506
4507 chan->ident = l2cap_get_ident(chan->conn);
4508
4509 cfm.icid = cpu_to_le16(chan->scid);
4510 cfm.result = cpu_to_le16(result);
4511
4512 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_CFM,
4513 sizeof(cfm), &cfm);
4514
4515 __set_chan_timer(chan, L2CAP_MOVE_TIMEOUT);
4516 }
4517
4518 static void l2cap_send_move_chan_cfm_icid(struct l2cap_conn *conn, u16 icid)
4519 {
4520 struct l2cap_move_chan_cfm cfm;
4521
4522 BT_DBG("conn %p, icid 0x%4.4x", conn, icid);
4523
4524 cfm.icid = cpu_to_le16(icid);
4525 cfm.result = __constant_cpu_to_le16(L2CAP_MC_UNCONFIRMED);
4526
4527 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_MOVE_CHAN_CFM,
4528 sizeof(cfm), &cfm);
4529 }
4530
4531 static void l2cap_send_move_chan_cfm_rsp(struct l2cap_conn *conn, u8 ident,
4532 u16 icid)
4533 {
4534 struct l2cap_move_chan_cfm_rsp rsp;
4535
4536 BT_DBG("icid 0x%4.4x", icid);
4537
4538 rsp.icid = cpu_to_le16(icid);
4539 l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_CFM_RSP, sizeof(rsp), &rsp);
4540 }
4541
4542 static void __release_logical_link(struct l2cap_chan *chan)
4543 {
4544 chan->hs_hchan = NULL;
4545 chan->hs_hcon = NULL;
4546
4547 /* Placeholder - release the logical link */
4548 }
4549
4550 static void l2cap_logical_fail(struct l2cap_chan *chan)
4551 {
4552 /* Logical link setup failed */
4553 if (chan->state != BT_CONNECTED) {
4554 /* Create channel failure, disconnect */
4555 l2cap_send_disconn_req(chan, ECONNRESET);
4556 return;
4557 }
4558
4559 switch (chan->move_role) {
4560 case L2CAP_MOVE_ROLE_RESPONDER:
4561 l2cap_move_done(chan);
4562 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
4563 break;
4564 case L2CAP_MOVE_ROLE_INITIATOR:
4565 if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
4566 chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
4567 /* Remote has only sent pending or
4568 * success responses, clean up
4569 */
4570 l2cap_move_done(chan);
4571 }
4572
4573 /* Other amp move states imply that the move
4574 * has already aborted
4575 */
4576 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4577 break;
4578 }
4579 }
4580
4581 static void l2cap_logical_finish_create(struct l2cap_chan *chan,
4582 struct hci_chan *hchan)
4583 {
4584 struct l2cap_conf_rsp rsp;
4585
4586 chan->hs_hchan = hchan;
4587 chan->hs_hcon->l2cap_data = chan->conn;
4588
4589 l2cap_send_efs_conf_rsp(chan, &rsp, chan->ident, 0);
4590
4591 if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
4592 int err;
4593
4594 set_default_fcs(chan);
4595
4596 err = l2cap_ertm_init(chan);
4597 if (err < 0)
4598 l2cap_send_disconn_req(chan, -err);
4599 else
4600 l2cap_chan_ready(chan);
4601 }
4602 }
4603
4604 static void l2cap_logical_finish_move(struct l2cap_chan *chan,
4605 struct hci_chan *hchan)
4606 {
4607 chan->hs_hcon = hchan->conn;
4608 chan->hs_hcon->l2cap_data = chan->conn;
4609
4610 BT_DBG("move_state %d", chan->move_state);
4611
4612 switch (chan->move_state) {
4613 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4614 /* Move confirm will be sent after a success
4615 * response is received
4616 */
4617 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4618 break;
4619 case L2CAP_MOVE_WAIT_LOGICAL_CFM:
4620 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4621 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4622 } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
4623 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4624 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4625 } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4626 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4627 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4628 }
4629 break;
4630 default:
4631 /* Move was not in expected state, free the channel */
4632 __release_logical_link(chan);
4633
4634 chan->move_state = L2CAP_MOVE_STABLE;
4635 }
4636 }
4637
4638 /* Call with chan locked */
4639 void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
4640 u8 status)
4641 {
4642 BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
4643
4644 if (status) {
4645 l2cap_logical_fail(chan);
4646 __release_logical_link(chan);
4647 return;
4648 }
4649
4650 if (chan->state != BT_CONNECTED) {
4651 /* Ignore logical link if channel is on BR/EDR */
4652 if (chan->local_amp_id != AMP_ID_BREDR)
4653 l2cap_logical_finish_create(chan, hchan);
4654 } else {
4655 l2cap_logical_finish_move(chan, hchan);
4656 }
4657 }
4658
4659 void l2cap_move_start(struct l2cap_chan *chan)
4660 {
4661 BT_DBG("chan %p", chan);
4662
4663 if (chan->local_amp_id == AMP_ID_BREDR) {
4664 if (chan->chan_policy != BT_CHANNEL_POLICY_AMP_PREFERRED)
4665 return;
4666 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4667 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4668 /* Placeholder - start physical link setup */
4669 } else {
4670 chan->move_role = L2CAP_MOVE_ROLE_INITIATOR;
4671 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4672 chan->move_id = 0;
4673 l2cap_move_setup(chan);
4674 l2cap_send_move_chan_req(chan, 0);
4675 }
4676 }
4677
4678 static void l2cap_do_create(struct l2cap_chan *chan, int result,
4679 u8 local_amp_id, u8 remote_amp_id)
4680 {
4681 BT_DBG("chan %p state %s %u -> %u", chan, state_to_string(chan->state),
4682 local_amp_id, remote_amp_id);
4683
4684 chan->fcs = L2CAP_FCS_NONE;
4685
4686 /* Outgoing channel on AMP */
4687 if (chan->state == BT_CONNECT) {
4688 if (result == L2CAP_CR_SUCCESS) {
4689 chan->local_amp_id = local_amp_id;
4690 l2cap_send_create_chan_req(chan, remote_amp_id);
4691 } else {
4692 /* Revert to BR/EDR connect */
4693 l2cap_send_conn_req(chan);
4694 }
4695
4696 return;
4697 }
4698
4699 /* Incoming channel on AMP */
4700 if (__l2cap_no_conn_pending(chan)) {
4701 struct l2cap_conn_rsp rsp;
4702 char buf[128];
4703 rsp.scid = cpu_to_le16(chan->dcid);
4704 rsp.dcid = cpu_to_le16(chan->scid);
4705
4706 if (result == L2CAP_CR_SUCCESS) {
4707 /* Send successful response */
4708 rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
4709 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4710 } else {
4711 /* Send negative response */
4712 rsp.result = __constant_cpu_to_le16(L2CAP_CR_NO_MEM);
4713 rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
4714 }
4715
4716 l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CREATE_CHAN_RSP,
4717 sizeof(rsp), &rsp);
4718
4719 if (result == L2CAP_CR_SUCCESS) {
4720 l2cap_state_change(chan, BT_CONFIG);
4721 set_bit(CONF_REQ_SENT, &chan->conf_state);
4722 l2cap_send_cmd(chan->conn, l2cap_get_ident(chan->conn),
4723 L2CAP_CONF_REQ,
4724 l2cap_build_conf_req(chan, buf), buf);
4725 chan->num_conf_req++;
4726 }
4727 }
4728 }
4729
4730 static void l2cap_do_move_initiate(struct l2cap_chan *chan, u8 local_amp_id,
4731 u8 remote_amp_id)
4732 {
4733 l2cap_move_setup(chan);
4734 chan->move_id = local_amp_id;
4735 chan->move_state = L2CAP_MOVE_WAIT_RSP;
4736
4737 l2cap_send_move_chan_req(chan, remote_amp_id);
4738 }
4739
4740 static void l2cap_do_move_respond(struct l2cap_chan *chan, int result)
4741 {
4742 struct hci_chan *hchan = NULL;
4743
4744 /* Placeholder - get hci_chan for logical link */
4745
4746 if (hchan) {
4747 if (hchan->state == BT_CONNECTED) {
4748 /* Logical link is ready to go */
4749 chan->hs_hcon = hchan->conn;
4750 chan->hs_hcon->l2cap_data = chan->conn;
4751 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4752 l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
4753
4754 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4755 } else {
4756 /* Wait for logical link to be ready */
4757 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4758 }
4759 } else {
4760 /* Logical link not available */
4761 l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_ALLOWED);
4762 }
4763 }
4764
4765 static void l2cap_do_move_cancel(struct l2cap_chan *chan, int result)
4766 {
4767 if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
4768 u8 rsp_result;
4769 if (result == -EINVAL)
4770 rsp_result = L2CAP_MR_BAD_ID;
4771 else
4772 rsp_result = L2CAP_MR_NOT_ALLOWED;
4773
4774 l2cap_send_move_chan_rsp(chan, rsp_result);
4775 }
4776
4777 chan->move_role = L2CAP_MOVE_ROLE_NONE;
4778 chan->move_state = L2CAP_MOVE_STABLE;
4779
4780 /* Restart data transmission */
4781 l2cap_ertm_send(chan);
4782 }
4783
4784 /* Invoke with locked chan */
4785 void __l2cap_physical_cfm(struct l2cap_chan *chan, int result)
4786 {
4787 u8 local_amp_id = chan->local_amp_id;
4788 u8 remote_amp_id = chan->remote_amp_id;
4789
4790 BT_DBG("chan %p, result %d, local_amp_id %d, remote_amp_id %d",
4791 chan, result, local_amp_id, remote_amp_id);
4792
4793 if (chan->state == BT_DISCONN || chan->state == BT_CLOSED) {
4794 l2cap_chan_unlock(chan);
4795 return;
4796 }
4797
4798 if (chan->state != BT_CONNECTED) {
4799 l2cap_do_create(chan, result, local_amp_id, remote_amp_id);
4800 } else if (result != L2CAP_MR_SUCCESS) {
4801 l2cap_do_move_cancel(chan, result);
4802 } else {
4803 switch (chan->move_role) {
4804 case L2CAP_MOVE_ROLE_INITIATOR:
4805 l2cap_do_move_initiate(chan, local_amp_id,
4806 remote_amp_id);
4807 break;
4808 case L2CAP_MOVE_ROLE_RESPONDER:
4809 l2cap_do_move_respond(chan, result);
4810 break;
4811 default:
4812 l2cap_do_move_cancel(chan, result);
4813 break;
4814 }
4815 }
4816 }
4817
4818 static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
4819 struct l2cap_cmd_hdr *cmd,
4820 u16 cmd_len, void *data)
4821 {
4822 struct l2cap_move_chan_req *req = data;
4823 struct l2cap_move_chan_rsp rsp;
4824 struct l2cap_chan *chan;
4825 u16 icid = 0;
4826 u16 result = L2CAP_MR_NOT_ALLOWED;
4827
4828 if (cmd_len != sizeof(*req))
4829 return -EPROTO;
4830
4831 icid = le16_to_cpu(req->icid);
4832
4833 BT_DBG("icid 0x%4.4x, dest_amp_id %d", icid, req->dest_amp_id);
4834
4835 if (!conn->hs_enabled)
4836 return -EINVAL;
4837
4838 chan = l2cap_get_chan_by_dcid(conn, icid);
4839 if (!chan) {
4840 rsp.icid = cpu_to_le16(icid);
4841 rsp.result = __constant_cpu_to_le16(L2CAP_MR_NOT_ALLOWED);
4842 l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
4843 sizeof(rsp), &rsp);
4844 return 0;
4845 }
4846
4847 chan->ident = cmd->ident;
4848
4849 if (chan->scid < L2CAP_CID_DYN_START ||
4850 chan->chan_policy == BT_CHANNEL_POLICY_BREDR_ONLY ||
4851 (chan->mode != L2CAP_MODE_ERTM &&
4852 chan->mode != L2CAP_MODE_STREAMING)) {
4853 result = L2CAP_MR_NOT_ALLOWED;
4854 goto send_move_response;
4855 }
4856
4857 if (chan->local_amp_id == req->dest_amp_id) {
4858 result = L2CAP_MR_SAME_ID;
4859 goto send_move_response;
4860 }
4861
4862 if (req->dest_amp_id != AMP_ID_BREDR) {
4863 struct hci_dev *hdev;
4864 hdev = hci_dev_get(req->dest_amp_id);
4865 if (!hdev || hdev->dev_type != HCI_AMP ||
4866 !test_bit(HCI_UP, &hdev->flags)) {
4867 if (hdev)
4868 hci_dev_put(hdev);
4869
4870 result = L2CAP_MR_BAD_ID;
4871 goto send_move_response;
4872 }
4873 hci_dev_put(hdev);
4874 }
4875
4876 /* Detect a move collision. Only send a collision response
4877 * if this side has "lost", otherwise proceed with the move.
4878 * The winner has the larger bd_addr.
4879 */
4880 if ((__chan_is_moving(chan) ||
4881 chan->move_role != L2CAP_MOVE_ROLE_NONE) &&
4882 bacmp(&conn->hcon->src, &conn->hcon->dst) > 0) {
4883 result = L2CAP_MR_COLLISION;
4884 goto send_move_response;
4885 }
4886
4887 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
4888 l2cap_move_setup(chan);
4889 chan->move_id = req->dest_amp_id;
4890 icid = chan->dcid;
4891
4892 if (req->dest_amp_id == AMP_ID_BREDR) {
4893 /* Moving to BR/EDR */
4894 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
4895 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4896 result = L2CAP_MR_PEND;
4897 } else {
4898 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
4899 result = L2CAP_MR_SUCCESS;
4900 }
4901 } else {
4902 chan->move_state = L2CAP_MOVE_WAIT_PREPARE;
4903 /* Placeholder - uncomment when amp functions are available */
4904 /*amp_accept_physical(chan, req->dest_amp_id);*/
4905 result = L2CAP_MR_PEND;
4906 }
4907
4908 send_move_response:
4909 l2cap_send_move_chan_rsp(chan, result);
4910
4911 l2cap_chan_unlock(chan);
4912
4913 return 0;
4914 }
4915
4916 static void l2cap_move_continue(struct l2cap_conn *conn, u16 icid, u16 result)
4917 {
4918 struct l2cap_chan *chan;
4919 struct hci_chan *hchan = NULL;
4920
4921 chan = l2cap_get_chan_by_scid(conn, icid);
4922 if (!chan) {
4923 l2cap_send_move_chan_cfm_icid(conn, icid);
4924 return;
4925 }
4926
4927 __clear_chan_timer(chan);
4928 if (result == L2CAP_MR_PEND)
4929 __set_chan_timer(chan, L2CAP_MOVE_ERTX_TIMEOUT);
4930
4931 switch (chan->move_state) {
4932 case L2CAP_MOVE_WAIT_LOGICAL_COMP:
4933 /* Move confirm will be sent when logical link
4934 * is complete.
4935 */
4936 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4937 break;
4938 case L2CAP_MOVE_WAIT_RSP_SUCCESS:
4939 if (result == L2CAP_MR_PEND) {
4940 break;
4941 } else if (test_bit(CONN_LOCAL_BUSY,
4942 &chan->conn_state)) {
4943 chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
4944 } else {
4945 /* Logical link is up or moving to BR/EDR,
4946 * proceed with move
4947 */
4948 chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
4949 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4950 }
4951 break;
4952 case L2CAP_MOVE_WAIT_RSP:
4953 /* Moving to AMP */
4954 if (result == L2CAP_MR_SUCCESS) {
4955 /* Remote is ready, send confirm immediately
4956 * after logical link is ready
4957 */
4958 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_CFM;
4959 } else {
4960 /* Both logical link and move success
4961 * are required to confirm
4962 */
4963 chan->move_state = L2CAP_MOVE_WAIT_LOGICAL_COMP;
4964 }
4965
4966 /* Placeholder - get hci_chan for logical link */
4967 if (!hchan) {
4968 /* Logical link not available */
4969 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
4970 break;
4971 }
4972
4973 /* If the logical link is not yet connected, do not
4974 * send confirmation.
4975 */
4976 if (hchan->state != BT_CONNECTED)
4977 break;
4978
4979 /* Logical link is already ready to go */
4980
4981 chan->hs_hcon = hchan->conn;
4982 chan->hs_hcon->l2cap_data = chan->conn;
4983
4984 if (result == L2CAP_MR_SUCCESS) {
4985 /* Can confirm now */
4986 l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
4987 } else {
4988 /* Now only need move success
4989 * to confirm
4990 */
4991 chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
4992 }
4993
4994 l2cap_logical_cfm(chan, hchan, L2CAP_MR_SUCCESS);
4995 break;
4996 default:
4997 /* Any other amp move state means the move failed. */
4998 chan->move_id = chan->local_amp_id;
4999 l2cap_move_done(chan);
5000 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5001 }
5002
5003 l2cap_chan_unlock(chan);
5004 }
5005
5006 static void l2cap_move_fail(struct l2cap_conn *conn, u8 ident, u16 icid,
5007 u16 result)
5008 {
5009 struct l2cap_chan *chan;
5010
5011 chan = l2cap_get_chan_by_ident(conn, ident);
5012 if (!chan) {
5013 /* Could not locate channel, icid is best guess */
5014 l2cap_send_move_chan_cfm_icid(conn, icid);
5015 return;
5016 }
5017
5018 __clear_chan_timer(chan);
5019
5020 if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
5021 if (result == L2CAP_MR_COLLISION) {
5022 chan->move_role = L2CAP_MOVE_ROLE_RESPONDER;
5023 } else {
5024 /* Cleanup - cancel move */
5025 chan->move_id = chan->local_amp_id;
5026 l2cap_move_done(chan);
5027 }
5028 }
5029
5030 l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
5031
5032 l2cap_chan_unlock(chan);
5033 }
5034
5035 static int l2cap_move_channel_rsp(struct l2cap_conn *conn,
5036 struct l2cap_cmd_hdr *cmd,
5037 u16 cmd_len, void *data)
5038 {
5039 struct l2cap_move_chan_rsp *rsp = data;
5040 u16 icid, result;
5041
5042 if (cmd_len != sizeof(*rsp))
5043 return -EPROTO;
5044
5045 icid = le16_to_cpu(rsp->icid);
5046 result = le16_to_cpu(rsp->result);
5047
5048 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5049
5050 if (result == L2CAP_MR_SUCCESS || result == L2CAP_MR_PEND)
5051 l2cap_move_continue(conn, icid, result);
5052 else
5053 l2cap_move_fail(conn, cmd->ident, icid, result);
5054
5055 return 0;
5056 }
5057
5058 static int l2cap_move_channel_confirm(struct l2cap_conn *conn,
5059 struct l2cap_cmd_hdr *cmd,
5060 u16 cmd_len, void *data)
5061 {
5062 struct l2cap_move_chan_cfm *cfm = data;
5063 struct l2cap_chan *chan;
5064 u16 icid, result;
5065
5066 if (cmd_len != sizeof(*cfm))
5067 return -EPROTO;
5068
5069 icid = le16_to_cpu(cfm->icid);
5070 result = le16_to_cpu(cfm->result);
5071
5072 BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
5073
5074 chan = l2cap_get_chan_by_dcid(conn, icid);
5075 if (!chan) {
5076 /* Spec requires a response even if the icid was not found */
5077 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5078 return 0;
5079 }
5080
5081 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM) {
5082 if (result == L2CAP_MC_CONFIRMED) {
5083 chan->local_amp_id = chan->move_id;
5084 if (chan->local_amp_id == AMP_ID_BREDR)
5085 __release_logical_link(chan);
5086 } else {
5087 chan->move_id = chan->local_amp_id;
5088 }
5089
5090 l2cap_move_done(chan);
5091 }
5092
5093 l2cap_send_move_chan_cfm_rsp(conn, cmd->ident, icid);
5094
5095 l2cap_chan_unlock(chan);
5096
5097 return 0;
5098 }
5099
5100 static inline int l2cap_move_channel_confirm_rsp(struct l2cap_conn *conn,
5101 struct l2cap_cmd_hdr *cmd,
5102 u16 cmd_len, void *data)
5103 {
5104 struct l2cap_move_chan_cfm_rsp *rsp = data;
5105 struct l2cap_chan *chan;
5106 u16 icid;
5107
5108 if (cmd_len != sizeof(*rsp))
5109 return -EPROTO;
5110
5111 icid = le16_to_cpu(rsp->icid);
5112
5113 BT_DBG("icid 0x%4.4x", icid);
5114
5115 chan = l2cap_get_chan_by_scid(conn, icid);
5116 if (!chan)
5117 return 0;
5118
5119 __clear_chan_timer(chan);
5120
5121 if (chan->move_state == L2CAP_MOVE_WAIT_CONFIRM_RSP) {
5122 chan->local_amp_id = chan->move_id;
5123
5124 if (chan->local_amp_id == AMP_ID_BREDR && chan->hs_hchan)
5125 __release_logical_link(chan);
5126
5127 l2cap_move_done(chan);
5128 }
5129
5130 l2cap_chan_unlock(chan);
5131
5132 return 0;
5133 }
5134
5135 static inline int l2cap_check_conn_param(u16 min, u16 max, u16 latency,
5136 u16 to_multiplier)
5137 {
5138 u16 max_latency;
5139
5140 if (min > max || min < 6 || max > 3200)
5141 return -EINVAL;
5142
5143 if (to_multiplier < 10 || to_multiplier > 3200)
5144 return -EINVAL;
5145
5146 if (max >= to_multiplier * 8)
5147 return -EINVAL;
5148
5149 max_latency = (to_multiplier * 8 / max) - 1;
5150 if (latency > 499 || latency > max_latency)
5151 return -EINVAL;
5152
5153 return 0;
5154 }
5155
5156 static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
5157 struct l2cap_cmd_hdr *cmd,
5158 u8 *data)
5159 {
5160 struct hci_conn *hcon = conn->hcon;
5161 struct l2cap_conn_param_update_req *req;
5162 struct l2cap_conn_param_update_rsp rsp;
5163 u16 min, max, latency, to_multiplier, cmd_len;
5164 int err;
5165
5166 if (!(hcon->link_mode & HCI_LM_MASTER))
5167 return -EINVAL;
5168
5169 cmd_len = __le16_to_cpu(cmd->len);
5170 if (cmd_len != sizeof(struct l2cap_conn_param_update_req))
5171 return -EPROTO;
5172
5173 req = (struct l2cap_conn_param_update_req *) data;
5174 min = __le16_to_cpu(req->min);
5175 max = __le16_to_cpu(req->max);
5176 latency = __le16_to_cpu(req->latency);
5177 to_multiplier = __le16_to_cpu(req->to_multiplier);
5178
5179 BT_DBG("min 0x%4.4x max 0x%4.4x latency: 0x%4.4x Timeout: 0x%4.4x",
5180 min, max, latency, to_multiplier);
5181
5182 memset(&rsp, 0, sizeof(rsp));
5183
5184 err = l2cap_check_conn_param(min, max, latency, to_multiplier);
5185 if (err)
5186 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
5187 else
5188 rsp.result = __constant_cpu_to_le16(L2CAP_CONN_PARAM_ACCEPTED);
5189
5190 l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_PARAM_UPDATE_RSP,
5191 sizeof(rsp), &rsp);
5192
5193 if (!err)
5194 hci_le_conn_update(hcon, min, max, latency, to_multiplier);
5195
5196 return 0;
5197 }
5198
5199 static inline int l2cap_bredr_sig_cmd(struct l2cap_conn *conn,
5200 struct l2cap_cmd_hdr *cmd, u16 cmd_len,
5201 u8 *data)
5202 {
5203 int err = 0;
5204
5205 switch (cmd->code) {
5206 case L2CAP_COMMAND_REJ:
5207 l2cap_command_rej(conn, cmd, cmd_len, data);
5208 break;
5209
5210 case L2CAP_CONN_REQ:
5211 err = l2cap_connect_req(conn, cmd, cmd_len, data);
5212 break;
5213
5214 case L2CAP_CONN_RSP:
5215 case L2CAP_CREATE_CHAN_RSP:
5216 l2cap_connect_create_rsp(conn, cmd, cmd_len, data);
5217 break;
5218
5219 case L2CAP_CONF_REQ:
5220 err = l2cap_config_req(conn, cmd, cmd_len, data);
5221 break;
5222
5223 case L2CAP_CONF_RSP:
5224 l2cap_config_rsp(conn, cmd, cmd_len, data);
5225 break;
5226
5227 case L2CAP_DISCONN_REQ:
5228 err = l2cap_disconnect_req(conn, cmd, cmd_len, data);
5229 break;
5230
5231 case L2CAP_DISCONN_RSP:
5232 l2cap_disconnect_rsp(conn, cmd, cmd_len, data);
5233 break;
5234
5235 case L2CAP_ECHO_REQ:
5236 l2cap_send_cmd(conn, cmd->ident, L2CAP_ECHO_RSP, cmd_len, data);
5237 break;
5238
5239 case L2CAP_ECHO_RSP:
5240 break;
5241
5242 case L2CAP_INFO_REQ:
5243 err = l2cap_information_req(conn, cmd, cmd_len, data);
5244 break;
5245
5246 case L2CAP_INFO_RSP:
5247 l2cap_information_rsp(conn, cmd, cmd_len, data);
5248 break;
5249
5250 case L2CAP_CREATE_CHAN_REQ:
5251 err = l2cap_create_channel_req(conn, cmd, cmd_len, data);
5252 break;
5253
5254 case L2CAP_MOVE_CHAN_REQ:
5255 err = l2cap_move_channel_req(conn, cmd, cmd_len, data);
5256 break;
5257
5258 case L2CAP_MOVE_CHAN_RSP:
5259 l2cap_move_channel_rsp(conn, cmd, cmd_len, data);
5260 break;
5261
5262 case L2CAP_MOVE_CHAN_CFM:
5263 err = l2cap_move_channel_confirm(conn, cmd, cmd_len, data);
5264 break;
5265
5266 case L2CAP_MOVE_CHAN_CFM_RSP:
5267 l2cap_move_channel_confirm_rsp(conn, cmd, cmd_len, data);
5268 break;
5269
5270 default:
5271 BT_ERR("Unknown BR/EDR signaling command 0x%2.2x", cmd->code);
5272 err = -EINVAL;
5273 break;
5274 }
5275
5276 return err;
5277 }
5278
5279 static inline int l2cap_le_sig_cmd(struct l2cap_conn *conn,
5280 struct l2cap_cmd_hdr *cmd, u8 *data)
5281 {
5282 switch (cmd->code) {
5283 case L2CAP_COMMAND_REJ:
5284 return 0;
5285
5286 case L2CAP_CONN_PARAM_UPDATE_REQ:
5287 return l2cap_conn_param_update_req(conn, cmd, data);
5288
5289 case L2CAP_CONN_PARAM_UPDATE_RSP:
5290 return 0;
5291
5292 default:
5293 BT_ERR("Unknown LE signaling command 0x%2.2x", cmd->code);
5294 return -EINVAL;
5295 }
5296 }
5297
5298 static inline void l2cap_le_sig_channel(struct l2cap_conn *conn,
5299 struct sk_buff *skb)
5300 {
5301 struct hci_conn *hcon = conn->hcon;
5302 struct l2cap_cmd_hdr *cmd;
5303 u16 len;
5304 int err;
5305
5306 if (hcon->type != LE_LINK)
5307 goto drop;
5308
5309 if (skb->len < L2CAP_CMD_HDR_SIZE)
5310 goto drop;
5311
5312 cmd = (void *) skb->data;
5313 skb_pull(skb, L2CAP_CMD_HDR_SIZE);
5314
5315 len = le16_to_cpu(cmd->len);
5316
5317 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd->code, len, cmd->ident);
5318
5319 if (len != skb->len || !cmd->ident) {
5320 BT_DBG("corrupted command");
5321 goto drop;
5322 }
5323
5324 err = l2cap_le_sig_cmd(conn, cmd, skb->data);
5325 if (err) {
5326 struct l2cap_cmd_rej_unk rej;
5327
5328 BT_ERR("Wrong link type (%d)", err);
5329
5330 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5331 l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
5332 sizeof(rej), &rej);
5333 }
5334
5335 drop:
5336 kfree_skb(skb);
5337 }
5338
5339 static inline void l2cap_sig_channel(struct l2cap_conn *conn,
5340 struct sk_buff *skb)
5341 {
5342 struct hci_conn *hcon = conn->hcon;
5343 u8 *data = skb->data;
5344 int len = skb->len;
5345 struct l2cap_cmd_hdr cmd;
5346 int err;
5347
5348 l2cap_raw_recv(conn, skb);
5349
5350 if (hcon->type != ACL_LINK)
5351 goto drop;
5352
5353 while (len >= L2CAP_CMD_HDR_SIZE) {
5354 u16 cmd_len;
5355 memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE);
5356 data += L2CAP_CMD_HDR_SIZE;
5357 len -= L2CAP_CMD_HDR_SIZE;
5358
5359 cmd_len = le16_to_cpu(cmd.len);
5360
5361 BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len,
5362 cmd.ident);
5363
5364 if (cmd_len > len || !cmd.ident) {
5365 BT_DBG("corrupted command");
5366 break;
5367 }
5368
5369 err = l2cap_bredr_sig_cmd(conn, &cmd, cmd_len, data);
5370 if (err) {
5371 struct l2cap_cmd_rej_unk rej;
5372
5373 BT_ERR("Wrong link type (%d)", err);
5374
5375 rej.reason = __constant_cpu_to_le16(L2CAP_REJ_NOT_UNDERSTOOD);
5376 l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ,
5377 sizeof(rej), &rej);
5378 }
5379
5380 data += cmd_len;
5381 len -= cmd_len;
5382 }
5383
5384 drop:
5385 kfree_skb(skb);
5386 }
5387
5388 static int l2cap_check_fcs(struct l2cap_chan *chan, struct sk_buff *skb)
5389 {
5390 u16 our_fcs, rcv_fcs;
5391 int hdr_size;
5392
5393 if (test_bit(FLAG_EXT_CTRL, &chan->flags))
5394 hdr_size = L2CAP_EXT_HDR_SIZE;
5395 else
5396 hdr_size = L2CAP_ENH_HDR_SIZE;
5397
5398 if (chan->fcs == L2CAP_FCS_CRC16) {
5399 skb_trim(skb, skb->len - L2CAP_FCS_SIZE);
5400 rcv_fcs = get_unaligned_le16(skb->data + skb->len);
5401 our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size);
5402
5403 if (our_fcs != rcv_fcs)
5404 return -EBADMSG;
5405 }
5406 return 0;
5407 }
5408
5409 static void l2cap_send_i_or_rr_or_rnr(struct l2cap_chan *chan)
5410 {
5411 struct l2cap_ctrl control;
5412
5413 BT_DBG("chan %p", chan);
5414
5415 memset(&control, 0, sizeof(control));
5416 control.sframe = 1;
5417 control.final = 1;
5418 control.reqseq = chan->buffer_seq;
5419 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5420
5421 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5422 control.super = L2CAP_SUPER_RNR;
5423 l2cap_send_sframe(chan, &control);
5424 }
5425
5426 if (test_and_clear_bit(CONN_REMOTE_BUSY, &chan->conn_state) &&
5427 chan->unacked_frames > 0)
5428 __set_retrans_timer(chan);
5429
5430 /* Send pending iframes */
5431 l2cap_ertm_send(chan);
5432
5433 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state) &&
5434 test_bit(CONN_SEND_FBIT, &chan->conn_state)) {
5435 /* F-bit wasn't sent in an s-frame or i-frame yet, so
5436 * send it now.
5437 */
5438 control.super = L2CAP_SUPER_RR;
5439 l2cap_send_sframe(chan, &control);
5440 }
5441 }
5442
5443 static void append_skb_frag(struct sk_buff *skb, struct sk_buff *new_frag,
5444 struct sk_buff **last_frag)
5445 {
5446 /* skb->len reflects data in skb as well as all fragments
5447 * skb->data_len reflects only data in fragments
5448 */
5449 if (!skb_has_frag_list(skb))
5450 skb_shinfo(skb)->frag_list = new_frag;
5451
5452 new_frag->next = NULL;
5453
5454 (*last_frag)->next = new_frag;
5455 *last_frag = new_frag;
5456
5457 skb->len += new_frag->len;
5458 skb->data_len += new_frag->len;
5459 skb->truesize += new_frag->truesize;
5460 }
5461
5462 static int l2cap_reassemble_sdu(struct l2cap_chan *chan, struct sk_buff *skb,
5463 struct l2cap_ctrl *control)
5464 {
5465 int err = -EINVAL;
5466
5467 switch (control->sar) {
5468 case L2CAP_SAR_UNSEGMENTED:
5469 if (chan->sdu)
5470 break;
5471
5472 err = chan->ops->recv(chan, skb);
5473 break;
5474
5475 case L2CAP_SAR_START:
5476 if (chan->sdu)
5477 break;
5478
5479 chan->sdu_len = get_unaligned_le16(skb->data);
5480 skb_pull(skb, L2CAP_SDULEN_SIZE);
5481
5482 if (chan->sdu_len > chan->imtu) {
5483 err = -EMSGSIZE;
5484 break;
5485 }
5486
5487 if (skb->len >= chan->sdu_len)
5488 break;
5489
5490 chan->sdu = skb;
5491 chan->sdu_last_frag = skb;
5492
5493 skb = NULL;
5494 err = 0;
5495 break;
5496
5497 case L2CAP_SAR_CONTINUE:
5498 if (!chan->sdu)
5499 break;
5500
5501 append_skb_frag(chan->sdu, skb,
5502 &chan->sdu_last_frag);
5503 skb = NULL;
5504
5505 if (chan->sdu->len >= chan->sdu_len)
5506 break;
5507
5508 err = 0;
5509 break;
5510
5511 case L2CAP_SAR_END:
5512 if (!chan->sdu)
5513 break;
5514
5515 append_skb_frag(chan->sdu, skb,
5516 &chan->sdu_last_frag);
5517 skb = NULL;
5518
5519 if (chan->sdu->len != chan->sdu_len)
5520 break;
5521
5522 err = chan->ops->recv(chan, chan->sdu);
5523
5524 if (!err) {
5525 /* Reassembly complete */
5526 chan->sdu = NULL;
5527 chan->sdu_last_frag = NULL;
5528 chan->sdu_len = 0;
5529 }
5530 break;
5531 }
5532
5533 if (err) {
5534 kfree_skb(skb);
5535 kfree_skb(chan->sdu);
5536 chan->sdu = NULL;
5537 chan->sdu_last_frag = NULL;
5538 chan->sdu_len = 0;
5539 }
5540
5541 return err;
5542 }
5543
5544 static int l2cap_resegment(struct l2cap_chan *chan)
5545 {
5546 /* Placeholder */
5547 return 0;
5548 }
5549
5550 void l2cap_chan_busy(struct l2cap_chan *chan, int busy)
5551 {
5552 u8 event;
5553
5554 if (chan->mode != L2CAP_MODE_ERTM)
5555 return;
5556
5557 event = busy ? L2CAP_EV_LOCAL_BUSY_DETECTED : L2CAP_EV_LOCAL_BUSY_CLEAR;
5558 l2cap_tx(chan, NULL, NULL, event);
5559 }
5560
5561 static int l2cap_rx_queued_iframes(struct l2cap_chan *chan)
5562 {
5563 int err = 0;
5564 /* Pass sequential frames to l2cap_reassemble_sdu()
5565 * until a gap is encountered.
5566 */
5567
5568 BT_DBG("chan %p", chan);
5569
5570 while (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5571 struct sk_buff *skb;
5572 BT_DBG("Searching for skb with txseq %d (queue len %d)",
5573 chan->buffer_seq, skb_queue_len(&chan->srej_q));
5574
5575 skb = l2cap_ertm_seq_in_queue(&chan->srej_q, chan->buffer_seq);
5576
5577 if (!skb)
5578 break;
5579
5580 skb_unlink(skb, &chan->srej_q);
5581 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
5582 err = l2cap_reassemble_sdu(chan, skb, &bt_cb(skb)->control);
5583 if (err)
5584 break;
5585 }
5586
5587 if (skb_queue_empty(&chan->srej_q)) {
5588 chan->rx_state = L2CAP_RX_STATE_RECV;
5589 l2cap_send_ack(chan);
5590 }
5591
5592 return err;
5593 }
5594
5595 static void l2cap_handle_srej(struct l2cap_chan *chan,
5596 struct l2cap_ctrl *control)
5597 {
5598 struct sk_buff *skb;
5599
5600 BT_DBG("chan %p, control %p", chan, control);
5601
5602 if (control->reqseq == chan->next_tx_seq) {
5603 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5604 l2cap_send_disconn_req(chan, ECONNRESET);
5605 return;
5606 }
5607
5608 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5609
5610 if (skb == NULL) {
5611 BT_DBG("Seq %d not available for retransmission",
5612 control->reqseq);
5613 return;
5614 }
5615
5616 if (chan->max_tx != 0 && bt_cb(skb)->control.retries >= chan->max_tx) {
5617 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5618 l2cap_send_disconn_req(chan, ECONNRESET);
5619 return;
5620 }
5621
5622 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5623
5624 if (control->poll) {
5625 l2cap_pass_to_tx(chan, control);
5626
5627 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5628 l2cap_retransmit(chan, control);
5629 l2cap_ertm_send(chan);
5630
5631 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5632 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5633 chan->srej_save_reqseq = control->reqseq;
5634 }
5635 } else {
5636 l2cap_pass_to_tx_fbit(chan, control);
5637
5638 if (control->final) {
5639 if (chan->srej_save_reqseq != control->reqseq ||
5640 !test_and_clear_bit(CONN_SREJ_ACT,
5641 &chan->conn_state))
5642 l2cap_retransmit(chan, control);
5643 } else {
5644 l2cap_retransmit(chan, control);
5645 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F) {
5646 set_bit(CONN_SREJ_ACT, &chan->conn_state);
5647 chan->srej_save_reqseq = control->reqseq;
5648 }
5649 }
5650 }
5651 }
5652
5653 static void l2cap_handle_rej(struct l2cap_chan *chan,
5654 struct l2cap_ctrl *control)
5655 {
5656 struct sk_buff *skb;
5657
5658 BT_DBG("chan %p, control %p", chan, control);
5659
5660 if (control->reqseq == chan->next_tx_seq) {
5661 BT_DBG("Invalid reqseq %d, disconnecting", control->reqseq);
5662 l2cap_send_disconn_req(chan, ECONNRESET);
5663 return;
5664 }
5665
5666 skb = l2cap_ertm_seq_in_queue(&chan->tx_q, control->reqseq);
5667
5668 if (chan->max_tx && skb &&
5669 bt_cb(skb)->control.retries >= chan->max_tx) {
5670 BT_DBG("Retry limit exceeded (%d)", chan->max_tx);
5671 l2cap_send_disconn_req(chan, ECONNRESET);
5672 return;
5673 }
5674
5675 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5676
5677 l2cap_pass_to_tx(chan, control);
5678
5679 if (control->final) {
5680 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state))
5681 l2cap_retransmit_all(chan, control);
5682 } else {
5683 l2cap_retransmit_all(chan, control);
5684 l2cap_ertm_send(chan);
5685 if (chan->tx_state == L2CAP_TX_STATE_WAIT_F)
5686 set_bit(CONN_REJ_ACT, &chan->conn_state);
5687 }
5688 }
5689
5690 static u8 l2cap_classify_txseq(struct l2cap_chan *chan, u16 txseq)
5691 {
5692 BT_DBG("chan %p, txseq %d", chan, txseq);
5693
5694 BT_DBG("last_acked_seq %d, expected_tx_seq %d", chan->last_acked_seq,
5695 chan->expected_tx_seq);
5696
5697 if (chan->rx_state == L2CAP_RX_STATE_SREJ_SENT) {
5698 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5699 chan->tx_win) {
5700 /* See notes below regarding "double poll" and
5701 * invalid packets.
5702 */
5703 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5704 BT_DBG("Invalid/Ignore - after SREJ");
5705 return L2CAP_TXSEQ_INVALID_IGNORE;
5706 } else {
5707 BT_DBG("Invalid - in window after SREJ sent");
5708 return L2CAP_TXSEQ_INVALID;
5709 }
5710 }
5711
5712 if (chan->srej_list.head == txseq) {
5713 BT_DBG("Expected SREJ");
5714 return L2CAP_TXSEQ_EXPECTED_SREJ;
5715 }
5716
5717 if (l2cap_ertm_seq_in_queue(&chan->srej_q, txseq)) {
5718 BT_DBG("Duplicate SREJ - txseq already stored");
5719 return L2CAP_TXSEQ_DUPLICATE_SREJ;
5720 }
5721
5722 if (l2cap_seq_list_contains(&chan->srej_list, txseq)) {
5723 BT_DBG("Unexpected SREJ - not requested");
5724 return L2CAP_TXSEQ_UNEXPECTED_SREJ;
5725 }
5726 }
5727
5728 if (chan->expected_tx_seq == txseq) {
5729 if (__seq_offset(chan, txseq, chan->last_acked_seq) >=
5730 chan->tx_win) {
5731 BT_DBG("Invalid - txseq outside tx window");
5732 return L2CAP_TXSEQ_INVALID;
5733 } else {
5734 BT_DBG("Expected");
5735 return L2CAP_TXSEQ_EXPECTED;
5736 }
5737 }
5738
5739 if (__seq_offset(chan, txseq, chan->last_acked_seq) <
5740 __seq_offset(chan, chan->expected_tx_seq, chan->last_acked_seq)) {
5741 BT_DBG("Duplicate - expected_tx_seq later than txseq");
5742 return L2CAP_TXSEQ_DUPLICATE;
5743 }
5744
5745 if (__seq_offset(chan, txseq, chan->last_acked_seq) >= chan->tx_win) {
5746 /* A source of invalid packets is a "double poll" condition,
5747 * where delays cause us to send multiple poll packets. If
5748 * the remote stack receives and processes both polls,
5749 * sequence numbers can wrap around in such a way that a
5750 * resent frame has a sequence number that looks like new data
5751 * with a sequence gap. This would trigger an erroneous SREJ
5752 * request.
5753 *
5754 * Fortunately, this is impossible with a tx window that's
5755 * less than half of the maximum sequence number, which allows
5756 * invalid frames to be safely ignored.
5757 *
5758 * With tx window sizes greater than half of the tx window
5759 * maximum, the frame is invalid and cannot be ignored. This
5760 * causes a disconnect.
5761 */
5762
5763 if (chan->tx_win <= ((chan->tx_win_max + 1) >> 1)) {
5764 BT_DBG("Invalid/Ignore - txseq outside tx window");
5765 return L2CAP_TXSEQ_INVALID_IGNORE;
5766 } else {
5767 BT_DBG("Invalid - txseq outside tx window");
5768 return L2CAP_TXSEQ_INVALID;
5769 }
5770 } else {
5771 BT_DBG("Unexpected - txseq indicates missing frames");
5772 return L2CAP_TXSEQ_UNEXPECTED;
5773 }
5774 }
5775
5776 static int l2cap_rx_state_recv(struct l2cap_chan *chan,
5777 struct l2cap_ctrl *control,
5778 struct sk_buff *skb, u8 event)
5779 {
5780 int err = 0;
5781 bool skb_in_use = false;
5782
5783 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5784 event);
5785
5786 switch (event) {
5787 case L2CAP_EV_RECV_IFRAME:
5788 switch (l2cap_classify_txseq(chan, control->txseq)) {
5789 case L2CAP_TXSEQ_EXPECTED:
5790 l2cap_pass_to_tx(chan, control);
5791
5792 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5793 BT_DBG("Busy, discarding expected seq %d",
5794 control->txseq);
5795 break;
5796 }
5797
5798 chan->expected_tx_seq = __next_seq(chan,
5799 control->txseq);
5800
5801 chan->buffer_seq = chan->expected_tx_seq;
5802 skb_in_use = true;
5803
5804 err = l2cap_reassemble_sdu(chan, skb, control);
5805 if (err)
5806 break;
5807
5808 if (control->final) {
5809 if (!test_and_clear_bit(CONN_REJ_ACT,
5810 &chan->conn_state)) {
5811 control->final = 0;
5812 l2cap_retransmit_all(chan, control);
5813 l2cap_ertm_send(chan);
5814 }
5815 }
5816
5817 if (!test_bit(CONN_LOCAL_BUSY, &chan->conn_state))
5818 l2cap_send_ack(chan);
5819 break;
5820 case L2CAP_TXSEQ_UNEXPECTED:
5821 l2cap_pass_to_tx(chan, control);
5822
5823 /* Can't issue SREJ frames in the local busy state.
5824 * Drop this frame, it will be seen as missing
5825 * when local busy is exited.
5826 */
5827 if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
5828 BT_DBG("Busy, discarding unexpected seq %d",
5829 control->txseq);
5830 break;
5831 }
5832
5833 /* There was a gap in the sequence, so an SREJ
5834 * must be sent for each missing frame. The
5835 * current frame is stored for later use.
5836 */
5837 skb_queue_tail(&chan->srej_q, skb);
5838 skb_in_use = true;
5839 BT_DBG("Queued %p (queue len %d)", skb,
5840 skb_queue_len(&chan->srej_q));
5841
5842 clear_bit(CONN_SREJ_ACT, &chan->conn_state);
5843 l2cap_seq_list_clear(&chan->srej_list);
5844 l2cap_send_srej(chan, control->txseq);
5845
5846 chan->rx_state = L2CAP_RX_STATE_SREJ_SENT;
5847 break;
5848 case L2CAP_TXSEQ_DUPLICATE:
5849 l2cap_pass_to_tx(chan, control);
5850 break;
5851 case L2CAP_TXSEQ_INVALID_IGNORE:
5852 break;
5853 case L2CAP_TXSEQ_INVALID:
5854 default:
5855 l2cap_send_disconn_req(chan, ECONNRESET);
5856 break;
5857 }
5858 break;
5859 case L2CAP_EV_RECV_RR:
5860 l2cap_pass_to_tx(chan, control);
5861 if (control->final) {
5862 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5863
5864 if (!test_and_clear_bit(CONN_REJ_ACT, &chan->conn_state) &&
5865 !__chan_is_moving(chan)) {
5866 control->final = 0;
5867 l2cap_retransmit_all(chan, control);
5868 }
5869
5870 l2cap_ertm_send(chan);
5871 } else if (control->poll) {
5872 l2cap_send_i_or_rr_or_rnr(chan);
5873 } else {
5874 if (test_and_clear_bit(CONN_REMOTE_BUSY,
5875 &chan->conn_state) &&
5876 chan->unacked_frames)
5877 __set_retrans_timer(chan);
5878
5879 l2cap_ertm_send(chan);
5880 }
5881 break;
5882 case L2CAP_EV_RECV_RNR:
5883 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5884 l2cap_pass_to_tx(chan, control);
5885 if (control && control->poll) {
5886 set_bit(CONN_SEND_FBIT, &chan->conn_state);
5887 l2cap_send_rr_or_rnr(chan, 0);
5888 }
5889 __clear_retrans_timer(chan);
5890 l2cap_seq_list_clear(&chan->retrans_list);
5891 break;
5892 case L2CAP_EV_RECV_REJ:
5893 l2cap_handle_rej(chan, control);
5894 break;
5895 case L2CAP_EV_RECV_SREJ:
5896 l2cap_handle_srej(chan, control);
5897 break;
5898 default:
5899 break;
5900 }
5901
5902 if (skb && !skb_in_use) {
5903 BT_DBG("Freeing %p", skb);
5904 kfree_skb(skb);
5905 }
5906
5907 return err;
5908 }
5909
5910 static int l2cap_rx_state_srej_sent(struct l2cap_chan *chan,
5911 struct l2cap_ctrl *control,
5912 struct sk_buff *skb, u8 event)
5913 {
5914 int err = 0;
5915 u16 txseq = control->txseq;
5916 bool skb_in_use = false;
5917
5918 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
5919 event);
5920
5921 switch (event) {
5922 case L2CAP_EV_RECV_IFRAME:
5923 switch (l2cap_classify_txseq(chan, txseq)) {
5924 case L2CAP_TXSEQ_EXPECTED:
5925 /* Keep frame for reassembly later */
5926 l2cap_pass_to_tx(chan, control);
5927 skb_queue_tail(&chan->srej_q, skb);
5928 skb_in_use = true;
5929 BT_DBG("Queued %p (queue len %d)", skb,
5930 skb_queue_len(&chan->srej_q));
5931
5932 chan->expected_tx_seq = __next_seq(chan, txseq);
5933 break;
5934 case L2CAP_TXSEQ_EXPECTED_SREJ:
5935 l2cap_seq_list_pop(&chan->srej_list);
5936
5937 l2cap_pass_to_tx(chan, control);
5938 skb_queue_tail(&chan->srej_q, skb);
5939 skb_in_use = true;
5940 BT_DBG("Queued %p (queue len %d)", skb,
5941 skb_queue_len(&chan->srej_q));
5942
5943 err = l2cap_rx_queued_iframes(chan);
5944 if (err)
5945 break;
5946
5947 break;
5948 case L2CAP_TXSEQ_UNEXPECTED:
5949 /* Got a frame that can't be reassembled yet.
5950 * Save it for later, and send SREJs to cover
5951 * the missing frames.
5952 */
5953 skb_queue_tail(&chan->srej_q, skb);
5954 skb_in_use = true;
5955 BT_DBG("Queued %p (queue len %d)", skb,
5956 skb_queue_len(&chan->srej_q));
5957
5958 l2cap_pass_to_tx(chan, control);
5959 l2cap_send_srej(chan, control->txseq);
5960 break;
5961 case L2CAP_TXSEQ_UNEXPECTED_SREJ:
5962 /* This frame was requested with an SREJ, but
5963 * some expected retransmitted frames are
5964 * missing. Request retransmission of missing
5965 * SREJ'd frames.
5966 */
5967 skb_queue_tail(&chan->srej_q, skb);
5968 skb_in_use = true;
5969 BT_DBG("Queued %p (queue len %d)", skb,
5970 skb_queue_len(&chan->srej_q));
5971
5972 l2cap_pass_to_tx(chan, control);
5973 l2cap_send_srej_list(chan, control->txseq);
5974 break;
5975 case L2CAP_TXSEQ_DUPLICATE_SREJ:
5976 /* We've already queued this frame. Drop this copy. */
5977 l2cap_pass_to_tx(chan, control);
5978 break;
5979 case L2CAP_TXSEQ_DUPLICATE:
5980 /* Expecting a later sequence number, so this frame
5981 * was already received. Ignore it completely.
5982 */
5983 break;
5984 case L2CAP_TXSEQ_INVALID_IGNORE:
5985 break;
5986 case L2CAP_TXSEQ_INVALID:
5987 default:
5988 l2cap_send_disconn_req(chan, ECONNRESET);
5989 break;
5990 }
5991 break;
5992 case L2CAP_EV_RECV_RR:
5993 l2cap_pass_to_tx(chan, control);
5994 if (control->final) {
5995 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
5996
5997 if (!test_and_clear_bit(CONN_REJ_ACT,
5998 &chan->conn_state)) {
5999 control->final = 0;
6000 l2cap_retransmit_all(chan, control);
6001 }
6002
6003 l2cap_ertm_send(chan);
6004 } else if (control->poll) {
6005 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6006 &chan->conn_state) &&
6007 chan->unacked_frames) {
6008 __set_retrans_timer(chan);
6009 }
6010
6011 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6012 l2cap_send_srej_tail(chan);
6013 } else {
6014 if (test_and_clear_bit(CONN_REMOTE_BUSY,
6015 &chan->conn_state) &&
6016 chan->unacked_frames)
6017 __set_retrans_timer(chan);
6018
6019 l2cap_send_ack(chan);
6020 }
6021 break;
6022 case L2CAP_EV_RECV_RNR:
6023 set_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6024 l2cap_pass_to_tx(chan, control);
6025 if (control->poll) {
6026 l2cap_send_srej_tail(chan);
6027 } else {
6028 struct l2cap_ctrl rr_control;
6029 memset(&rr_control, 0, sizeof(rr_control));
6030 rr_control.sframe = 1;
6031 rr_control.super = L2CAP_SUPER_RR;
6032 rr_control.reqseq = chan->buffer_seq;
6033 l2cap_send_sframe(chan, &rr_control);
6034 }
6035
6036 break;
6037 case L2CAP_EV_RECV_REJ:
6038 l2cap_handle_rej(chan, control);
6039 break;
6040 case L2CAP_EV_RECV_SREJ:
6041 l2cap_handle_srej(chan, control);
6042 break;
6043 }
6044
6045 if (skb && !skb_in_use) {
6046 BT_DBG("Freeing %p", skb);
6047 kfree_skb(skb);
6048 }
6049
6050 return err;
6051 }
6052
6053 static int l2cap_finish_move(struct l2cap_chan *chan)
6054 {
6055 BT_DBG("chan %p", chan);
6056
6057 chan->rx_state = L2CAP_RX_STATE_RECV;
6058
6059 if (chan->hs_hcon)
6060 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6061 else
6062 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6063
6064 return l2cap_resegment(chan);
6065 }
6066
6067 static int l2cap_rx_state_wait_p(struct l2cap_chan *chan,
6068 struct l2cap_ctrl *control,
6069 struct sk_buff *skb, u8 event)
6070 {
6071 int err;
6072
6073 BT_DBG("chan %p, control %p, skb %p, event %d", chan, control, skb,
6074 event);
6075
6076 if (!control->poll)
6077 return -EPROTO;
6078
6079 l2cap_process_reqseq(chan, control->reqseq);
6080
6081 if (!skb_queue_empty(&chan->tx_q))
6082 chan->tx_send_head = skb_peek(&chan->tx_q);
6083 else
6084 chan->tx_send_head = NULL;
6085
6086 /* Rewind next_tx_seq to the point expected
6087 * by the receiver.
6088 */
6089 chan->next_tx_seq = control->reqseq;
6090 chan->unacked_frames = 0;
6091
6092 err = l2cap_finish_move(chan);
6093 if (err)
6094 return err;
6095
6096 set_bit(CONN_SEND_FBIT, &chan->conn_state);
6097 l2cap_send_i_or_rr_or_rnr(chan);
6098
6099 if (event == L2CAP_EV_RECV_IFRAME)
6100 return -EPROTO;
6101
6102 return l2cap_rx_state_recv(chan, control, NULL, event);
6103 }
6104
6105 static int l2cap_rx_state_wait_f(struct l2cap_chan *chan,
6106 struct l2cap_ctrl *control,
6107 struct sk_buff *skb, u8 event)
6108 {
6109 int err;
6110
6111 if (!control->final)
6112 return -EPROTO;
6113
6114 clear_bit(CONN_REMOTE_BUSY, &chan->conn_state);
6115
6116 chan->rx_state = L2CAP_RX_STATE_RECV;
6117 l2cap_process_reqseq(chan, control->reqseq);
6118
6119 if (!skb_queue_empty(&chan->tx_q))
6120 chan->tx_send_head = skb_peek(&chan->tx_q);
6121 else
6122 chan->tx_send_head = NULL;
6123
6124 /* Rewind next_tx_seq to the point expected
6125 * by the receiver.
6126 */
6127 chan->next_tx_seq = control->reqseq;
6128 chan->unacked_frames = 0;
6129
6130 if (chan->hs_hcon)
6131 chan->conn->mtu = chan->hs_hcon->hdev->block_mtu;
6132 else
6133 chan->conn->mtu = chan->conn->hcon->hdev->acl_mtu;
6134
6135 err = l2cap_resegment(chan);
6136
6137 if (!err)
6138 err = l2cap_rx_state_recv(chan, control, skb, event);
6139
6140 return err;
6141 }
6142
6143 static bool __valid_reqseq(struct l2cap_chan *chan, u16 reqseq)
6144 {
6145 /* Make sure reqseq is for a packet that has been sent but not acked */
6146 u16 unacked;
6147
6148 unacked = __seq_offset(chan, chan->next_tx_seq, chan->expected_ack_seq);
6149 return __seq_offset(chan, chan->next_tx_seq, reqseq) <= unacked;
6150 }
6151
6152 static int l2cap_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6153 struct sk_buff *skb, u8 event)
6154 {
6155 int err = 0;
6156
6157 BT_DBG("chan %p, control %p, skb %p, event %d, state %d", chan,
6158 control, skb, event, chan->rx_state);
6159
6160 if (__valid_reqseq(chan, control->reqseq)) {
6161 switch (chan->rx_state) {
6162 case L2CAP_RX_STATE_RECV:
6163 err = l2cap_rx_state_recv(chan, control, skb, event);
6164 break;
6165 case L2CAP_RX_STATE_SREJ_SENT:
6166 err = l2cap_rx_state_srej_sent(chan, control, skb,
6167 event);
6168 break;
6169 case L2CAP_RX_STATE_WAIT_P:
6170 err = l2cap_rx_state_wait_p(chan, control, skb, event);
6171 break;
6172 case L2CAP_RX_STATE_WAIT_F:
6173 err = l2cap_rx_state_wait_f(chan, control, skb, event);
6174 break;
6175 default:
6176 /* shut it down */
6177 break;
6178 }
6179 } else {
6180 BT_DBG("Invalid reqseq %d (next_tx_seq %d, expected_ack_seq %d",
6181 control->reqseq, chan->next_tx_seq,
6182 chan->expected_ack_seq);
6183 l2cap_send_disconn_req(chan, ECONNRESET);
6184 }
6185
6186 return err;
6187 }
6188
6189 static int l2cap_stream_rx(struct l2cap_chan *chan, struct l2cap_ctrl *control,
6190 struct sk_buff *skb)
6191 {
6192 int err = 0;
6193
6194 BT_DBG("chan %p, control %p, skb %p, state %d", chan, control, skb,
6195 chan->rx_state);
6196
6197 if (l2cap_classify_txseq(chan, control->txseq) ==
6198 L2CAP_TXSEQ_EXPECTED) {
6199 l2cap_pass_to_tx(chan, control);
6200
6201 BT_DBG("buffer_seq %d->%d", chan->buffer_seq,
6202 __next_seq(chan, chan->buffer_seq));
6203
6204 chan->buffer_seq = __next_seq(chan, chan->buffer_seq);
6205
6206 l2cap_reassemble_sdu(chan, skb, control);
6207 } else {
6208 if (chan->sdu) {
6209 kfree_skb(chan->sdu);
6210 chan->sdu = NULL;
6211 }
6212 chan->sdu_last_frag = NULL;
6213 chan->sdu_len = 0;
6214
6215 if (skb) {
6216 BT_DBG("Freeing %p", skb);
6217 kfree_skb(skb);
6218 }
6219 }
6220
6221 chan->last_acked_seq = control->txseq;
6222 chan->expected_tx_seq = __next_seq(chan, control->txseq);
6223
6224 return err;
6225 }
6226
6227 static int l2cap_data_rcv(struct l2cap_chan *chan, struct sk_buff *skb)
6228 {
6229 struct l2cap_ctrl *control = &bt_cb(skb)->control;
6230 u16 len;
6231 u8 event;
6232
6233 __unpack_control(chan, skb);
6234
6235 len = skb->len;
6236
6237 /*
6238 * We can just drop the corrupted I-frame here.
6239 * Receiver will miss it and start proper recovery
6240 * procedures and ask for retransmission.
6241 */
6242 if (l2cap_check_fcs(chan, skb))
6243 goto drop;
6244
6245 if (!control->sframe && control->sar == L2CAP_SAR_START)
6246 len -= L2CAP_SDULEN_SIZE;
6247
6248 if (chan->fcs == L2CAP_FCS_CRC16)
6249 len -= L2CAP_FCS_SIZE;
6250
6251 if (len > chan->mps) {
6252 l2cap_send_disconn_req(chan, ECONNRESET);
6253 goto drop;
6254 }
6255
6256 if (!control->sframe) {
6257 int err;
6258
6259 BT_DBG("iframe sar %d, reqseq %d, final %d, txseq %d",
6260 control->sar, control->reqseq, control->final,
6261 control->txseq);
6262
6263 /* Validate F-bit - F=0 always valid, F=1 only
6264 * valid in TX WAIT_F
6265 */
6266 if (control->final && chan->tx_state != L2CAP_TX_STATE_WAIT_F)
6267 goto drop;
6268
6269 if (chan->mode != L2CAP_MODE_STREAMING) {
6270 event = L2CAP_EV_RECV_IFRAME;
6271 err = l2cap_rx(chan, control, skb, event);
6272 } else {
6273 err = l2cap_stream_rx(chan, control, skb);
6274 }
6275
6276 if (err)
6277 l2cap_send_disconn_req(chan, ECONNRESET);
6278 } else {
6279 const u8 rx_func_to_event[4] = {
6280 L2CAP_EV_RECV_RR, L2CAP_EV_RECV_REJ,
6281 L2CAP_EV_RECV_RNR, L2CAP_EV_RECV_SREJ
6282 };
6283
6284 /* Only I-frames are expected in streaming mode */
6285 if (chan->mode == L2CAP_MODE_STREAMING)
6286 goto drop;
6287
6288 BT_DBG("sframe reqseq %d, final %d, poll %d, super %d",
6289 control->reqseq, control->final, control->poll,
6290 control->super);
6291
6292 if (len != 0) {
6293 BT_ERR("Trailing bytes: %d in sframe", len);
6294 l2cap_send_disconn_req(chan, ECONNRESET);
6295 goto drop;
6296 }
6297
6298 /* Validate F and P bits */
6299 if (control->final && (control->poll ||
6300 chan->tx_state != L2CAP_TX_STATE_WAIT_F))
6301 goto drop;
6302
6303 event = rx_func_to_event[control->super];
6304 if (l2cap_rx(chan, control, skb, event))
6305 l2cap_send_disconn_req(chan, ECONNRESET);
6306 }
6307
6308 return 0;
6309
6310 drop:
6311 kfree_skb(skb);
6312 return 0;
6313 }
6314
6315 static void l2cap_data_channel(struct l2cap_conn *conn, u16 cid,
6316 struct sk_buff *skb)
6317 {
6318 struct l2cap_chan *chan;
6319
6320 chan = l2cap_get_chan_by_scid(conn, cid);
6321 if (!chan) {
6322 if (cid == L2CAP_CID_A2MP) {
6323 chan = a2mp_channel_create(conn, skb);
6324 if (!chan) {
6325 kfree_skb(skb);
6326 return;
6327 }
6328
6329 l2cap_chan_lock(chan);
6330 } else {
6331 BT_DBG("unknown cid 0x%4.4x", cid);
6332 /* Drop packet and return */
6333 kfree_skb(skb);
6334 return;
6335 }
6336 }
6337
6338 BT_DBG("chan %p, len %d", chan, skb->len);
6339
6340 if (chan->state != BT_CONNECTED)
6341 goto drop;
6342
6343 switch (chan->mode) {
6344 case L2CAP_MODE_BASIC:
6345 /* If socket recv buffers overflows we drop data here
6346 * which is *bad* because L2CAP has to be reliable.
6347 * But we don't have any other choice. L2CAP doesn't
6348 * provide flow control mechanism. */
6349
6350 if (chan->imtu < skb->len)
6351 goto drop;
6352
6353 if (!chan->ops->recv(chan, skb))
6354 goto done;
6355 break;
6356
6357 case L2CAP_MODE_ERTM:
6358 case L2CAP_MODE_STREAMING:
6359 l2cap_data_rcv(chan, skb);
6360 goto done;
6361
6362 default:
6363 BT_DBG("chan %p: bad mode 0x%2.2x", chan, chan->mode);
6364 break;
6365 }
6366
6367 drop:
6368 kfree_skb(skb);
6369
6370 done:
6371 l2cap_chan_unlock(chan);
6372 }
6373
6374 static void l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm,
6375 struct sk_buff *skb)
6376 {
6377 struct hci_conn *hcon = conn->hcon;
6378 struct l2cap_chan *chan;
6379
6380 if (hcon->type != ACL_LINK)
6381 goto drop;
6382
6383 chan = l2cap_global_chan_by_psm(0, psm, &hcon->src, &hcon->dst);
6384 if (!chan)
6385 goto drop;
6386
6387 BT_DBG("chan %p, len %d", chan, skb->len);
6388
6389 if (chan->state != BT_BOUND && chan->state != BT_CONNECTED)
6390 goto drop;
6391
6392 if (chan->imtu < skb->len)
6393 goto drop;
6394
6395 /* Store remote BD_ADDR and PSM for msg_name */
6396 bacpy(&bt_cb(skb)->bdaddr, &hcon->dst);
6397 bt_cb(skb)->psm = psm;
6398
6399 if (!chan->ops->recv(chan, skb))
6400 return;
6401
6402 drop:
6403 kfree_skb(skb);
6404 }
6405
6406 static void l2cap_att_channel(struct l2cap_conn *conn,
6407 struct sk_buff *skb)
6408 {
6409 struct hci_conn *hcon = conn->hcon;
6410 struct l2cap_chan *chan;
6411
6412 if (hcon->type != LE_LINK)
6413 goto drop;
6414
6415 chan = l2cap_global_chan_by_scid(BT_CONNECTED, L2CAP_CID_ATT,
6416 &hcon->src, &hcon->dst);
6417 if (!chan)
6418 goto drop;
6419
6420 BT_DBG("chan %p, len %d", chan, skb->len);
6421
6422 if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, hcon->dst_type))
6423 goto drop;
6424
6425 if (chan->imtu < skb->len)
6426 goto drop;
6427
6428 if (!chan->ops->recv(chan, skb))
6429 return;
6430
6431 drop:
6432 kfree_skb(skb);
6433 }
6434
6435 static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb)
6436 {
6437 struct l2cap_hdr *lh = (void *) skb->data;
6438 u16 cid, len;
6439 __le16 psm;
6440
6441 skb_pull(skb, L2CAP_HDR_SIZE);
6442 cid = __le16_to_cpu(lh->cid);
6443 len = __le16_to_cpu(lh->len);
6444
6445 if (len != skb->len) {
6446 kfree_skb(skb);
6447 return;
6448 }
6449
6450 BT_DBG("len %d, cid 0x%4.4x", len, cid);
6451
6452 switch (cid) {
6453 case L2CAP_CID_SIGNALING:
6454 l2cap_sig_channel(conn, skb);
6455 break;
6456
6457 case L2CAP_CID_CONN_LESS:
6458 psm = get_unaligned((__le16 *) skb->data);
6459 skb_pull(skb, L2CAP_PSMLEN_SIZE);
6460 l2cap_conless_channel(conn, psm, skb);
6461 break;
6462
6463 case L2CAP_CID_ATT:
6464 l2cap_att_channel(conn, skb);
6465 break;
6466
6467 case L2CAP_CID_LE_SIGNALING:
6468 l2cap_le_sig_channel(conn, skb);
6469 break;
6470
6471 case L2CAP_CID_SMP:
6472 if (smp_sig_channel(conn, skb))
6473 l2cap_conn_del(conn->hcon, EACCES);
6474 break;
6475
6476 default:
6477 l2cap_data_channel(conn, cid, skb);
6478 break;
6479 }
6480 }
6481
6482 /* ---- L2CAP interface with lower layer (HCI) ---- */
6483
6484 int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr)
6485 {
6486 int exact = 0, lm1 = 0, lm2 = 0;
6487 struct l2cap_chan *c;
6488
6489 BT_DBG("hdev %s, bdaddr %pMR", hdev->name, bdaddr);
6490
6491 /* Find listening sockets and check their link_mode */
6492 read_lock(&chan_list_lock);
6493 list_for_each_entry(c, &chan_list, global_l) {
6494 if (c->state != BT_LISTEN)
6495 continue;
6496
6497 if (!bacmp(&c->src, &hdev->bdaddr)) {
6498 lm1 |= HCI_LM_ACCEPT;
6499 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
6500 lm1 |= HCI_LM_MASTER;
6501 exact++;
6502 } else if (!bacmp(&c->src, BDADDR_ANY)) {
6503 lm2 |= HCI_LM_ACCEPT;
6504 if (test_bit(FLAG_ROLE_SWITCH, &c->flags))
6505 lm2 |= HCI_LM_MASTER;
6506 }
6507 }
6508 read_unlock(&chan_list_lock);
6509
6510 return exact ? lm1 : lm2;
6511 }
6512
6513 void l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
6514 {
6515 struct l2cap_conn *conn;
6516
6517 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
6518
6519 if (!status) {
6520 conn = l2cap_conn_add(hcon);
6521 if (conn)
6522 l2cap_conn_ready(conn);
6523 } else {
6524 l2cap_conn_del(hcon, bt_to_errno(status));
6525 }
6526 }
6527
6528 int l2cap_disconn_ind(struct hci_conn *hcon)
6529 {
6530 struct l2cap_conn *conn = hcon->l2cap_data;
6531
6532 BT_DBG("hcon %p", hcon);
6533
6534 if (!conn)
6535 return HCI_ERROR_REMOTE_USER_TERM;
6536 return conn->disc_reason;
6537 }
6538
6539 void l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason)
6540 {
6541 BT_DBG("hcon %p reason %d", hcon, reason);
6542
6543 l2cap_conn_del(hcon, bt_to_errno(reason));
6544 }
6545
6546 static inline void l2cap_check_encryption(struct l2cap_chan *chan, u8 encrypt)
6547 {
6548 if (chan->chan_type != L2CAP_CHAN_CONN_ORIENTED)
6549 return;
6550
6551 if (encrypt == 0x00) {
6552 if (chan->sec_level == BT_SECURITY_MEDIUM) {
6553 __set_chan_timer(chan, L2CAP_ENC_TIMEOUT);
6554 } else if (chan->sec_level == BT_SECURITY_HIGH)
6555 l2cap_chan_close(chan, ECONNREFUSED);
6556 } else {
6557 if (chan->sec_level == BT_SECURITY_MEDIUM)
6558 __clear_chan_timer(chan);
6559 }
6560 }
6561
6562 int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
6563 {
6564 struct l2cap_conn *conn = hcon->l2cap_data;
6565 struct l2cap_chan *chan;
6566
6567 if (!conn)
6568 return 0;
6569
6570 BT_DBG("conn %p status 0x%2.2x encrypt %u", conn, status, encrypt);
6571
6572 if (hcon->type == LE_LINK) {
6573 if (!status && encrypt)
6574 smp_distribute_keys(conn, 0);
6575 cancel_delayed_work(&conn->security_timer);
6576 }
6577
6578 mutex_lock(&conn->chan_lock);
6579
6580 list_for_each_entry(chan, &conn->chan_l, list) {
6581 l2cap_chan_lock(chan);
6582
6583 BT_DBG("chan %p scid 0x%4.4x state %s", chan, chan->scid,
6584 state_to_string(chan->state));
6585
6586 if (chan->chan_type == L2CAP_CHAN_CONN_FIX_A2MP) {
6587 l2cap_chan_unlock(chan);
6588 continue;
6589 }
6590
6591 if (chan->scid == L2CAP_CID_ATT) {
6592 if (!status && encrypt) {
6593 chan->sec_level = hcon->sec_level;
6594 l2cap_chan_ready(chan);
6595 }
6596
6597 l2cap_chan_unlock(chan);
6598 continue;
6599 }
6600
6601 if (!__l2cap_no_conn_pending(chan)) {
6602 l2cap_chan_unlock(chan);
6603 continue;
6604 }
6605
6606 if (!status && (chan->state == BT_CONNECTED ||
6607 chan->state == BT_CONFIG)) {
6608 chan->ops->resume(chan);
6609 l2cap_check_encryption(chan, encrypt);
6610 l2cap_chan_unlock(chan);
6611 continue;
6612 }
6613
6614 if (chan->state == BT_CONNECT) {
6615 if (!status) {
6616 l2cap_start_connection(chan);
6617 } else {
6618 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
6619 }
6620 } else if (chan->state == BT_CONNECT2) {
6621 struct l2cap_conn_rsp rsp;
6622 __u16 res, stat;
6623
6624 if (!status) {
6625 if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
6626 res = L2CAP_CR_PEND;
6627 stat = L2CAP_CS_AUTHOR_PEND;
6628 chan->ops->defer(chan);
6629 } else {
6630 l2cap_state_change(chan, BT_CONFIG);
6631 res = L2CAP_CR_SUCCESS;
6632 stat = L2CAP_CS_NO_INFO;
6633 }
6634 } else {
6635 l2cap_state_change(chan, BT_DISCONN);
6636 __set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
6637 res = L2CAP_CR_SEC_BLOCK;
6638 stat = L2CAP_CS_NO_INFO;
6639 }
6640
6641 rsp.scid = cpu_to_le16(chan->dcid);
6642 rsp.dcid = cpu_to_le16(chan->scid);
6643 rsp.result = cpu_to_le16(res);
6644 rsp.status = cpu_to_le16(stat);
6645 l2cap_send_cmd(conn, chan->ident, L2CAP_CONN_RSP,
6646 sizeof(rsp), &rsp);
6647
6648 if (!test_bit(CONF_REQ_SENT, &chan->conf_state) &&
6649 res == L2CAP_CR_SUCCESS) {
6650 char buf[128];
6651 set_bit(CONF_REQ_SENT, &chan->conf_state);
6652 l2cap_send_cmd(conn, l2cap_get_ident(conn),
6653 L2CAP_CONF_REQ,
6654 l2cap_build_conf_req(chan, buf),
6655 buf);
6656 chan->num_conf_req++;
6657 }
6658 }
6659
6660 l2cap_chan_unlock(chan);
6661 }
6662
6663 mutex_unlock(&conn->chan_lock);
6664
6665 return 0;
6666 }
6667
6668 int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
6669 {
6670 struct l2cap_conn *conn = hcon->l2cap_data;
6671 struct l2cap_hdr *hdr;
6672 int len;
6673
6674 /* For AMP controller do not create l2cap conn */
6675 if (!conn && hcon->hdev->dev_type != HCI_BREDR)
6676 goto drop;
6677
6678 if (!conn)
6679 conn = l2cap_conn_add(hcon);
6680
6681 if (!conn)
6682 goto drop;
6683
6684 BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags);
6685
6686 switch (flags) {
6687 case ACL_START:
6688 case ACL_START_NO_FLUSH:
6689 case ACL_COMPLETE:
6690 if (conn->rx_len) {
6691 BT_ERR("Unexpected start frame (len %d)", skb->len);
6692 kfree_skb(conn->rx_skb);
6693 conn->rx_skb = NULL;
6694 conn->rx_len = 0;
6695 l2cap_conn_unreliable(conn, ECOMM);
6696 }
6697
6698 /* Start fragment always begin with Basic L2CAP header */
6699 if (skb->len < L2CAP_HDR_SIZE) {
6700 BT_ERR("Frame is too short (len %d)", skb->len);
6701 l2cap_conn_unreliable(conn, ECOMM);
6702 goto drop;
6703 }
6704
6705 hdr = (struct l2cap_hdr *) skb->data;
6706 len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE;
6707
6708 if (len == skb->len) {
6709 /* Complete frame received */
6710 l2cap_recv_frame(conn, skb);
6711 return 0;
6712 }
6713
6714 BT_DBG("Start: total len %d, frag len %d", len, skb->len);
6715
6716 if (skb->len > len) {
6717 BT_ERR("Frame is too long (len %d, expected len %d)",
6718 skb->len, len);
6719 l2cap_conn_unreliable(conn, ECOMM);
6720 goto drop;
6721 }
6722
6723 /* Allocate skb for the complete frame (with header) */
6724 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
6725 if (!conn->rx_skb)
6726 goto drop;
6727
6728 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
6729 skb->len);
6730 conn->rx_len = len - skb->len;
6731 break;
6732
6733 case ACL_CONT:
6734 BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len);
6735
6736 if (!conn->rx_len) {
6737 BT_ERR("Unexpected continuation frame (len %d)", skb->len);
6738 l2cap_conn_unreliable(conn, ECOMM);
6739 goto drop;
6740 }
6741
6742 if (skb->len > conn->rx_len) {
6743 BT_ERR("Fragment is too long (len %d, expected %d)",
6744 skb->len, conn->rx_len);
6745 kfree_skb(conn->rx_skb);
6746 conn->rx_skb = NULL;
6747 conn->rx_len = 0;
6748 l2cap_conn_unreliable(conn, ECOMM);
6749 goto drop;
6750 }
6751
6752 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
6753 skb->len);
6754 conn->rx_len -= skb->len;
6755
6756 if (!conn->rx_len) {
6757 /* Complete frame received. l2cap_recv_frame
6758 * takes ownership of the skb so set the global
6759 * rx_skb pointer to NULL first.
6760 */
6761 struct sk_buff *rx_skb = conn->rx_skb;
6762 conn->rx_skb = NULL;
6763 l2cap_recv_frame(conn, rx_skb);
6764 }
6765 break;
6766 }
6767
6768 drop:
6769 kfree_skb(skb);
6770 return 0;
6771 }
6772
6773 static int l2cap_debugfs_show(struct seq_file *f, void *p)
6774 {
6775 struct l2cap_chan *c;
6776
6777 read_lock(&chan_list_lock);
6778
6779 list_for_each_entry(c, &chan_list, global_l) {
6780 seq_printf(f, "%pMR %pMR %d %d 0x%4.4x 0x%4.4x %d %d %d %d\n",
6781 &c->src, &c->dst,
6782 c->state, __le16_to_cpu(c->psm),
6783 c->scid, c->dcid, c->imtu, c->omtu,
6784 c->sec_level, c->mode);
6785 }
6786
6787 read_unlock(&chan_list_lock);
6788
6789 return 0;
6790 }
6791
6792 static int l2cap_debugfs_open(struct inode *inode, struct file *file)
6793 {
6794 return single_open(file, l2cap_debugfs_show, inode->i_private);
6795 }
6796
6797 static const struct file_operations l2cap_debugfs_fops = {
6798 .open = l2cap_debugfs_open,
6799 .read = seq_read,
6800 .llseek = seq_lseek,
6801 .release = single_release,
6802 };
6803
6804 static struct dentry *l2cap_debugfs;
6805
6806 int __init l2cap_init(void)
6807 {
6808 int err;
6809
6810 err = l2cap_init_sockets();
6811 if (err < 0)
6812 return err;
6813
6814 if (IS_ERR_OR_NULL(bt_debugfs))
6815 return 0;
6816
6817 l2cap_debugfs = debugfs_create_file("l2cap", 0444, bt_debugfs,
6818 NULL, &l2cap_debugfs_fops);
6819
6820 return 0;
6821 }
6822
6823 void l2cap_exit(void)
6824 {
6825 debugfs_remove(l2cap_debugfs);
6826 l2cap_cleanup_sockets();
6827 }
6828
6829 module_param(disable_ertm, bool, 0644);
6830 MODULE_PARM_DESC(disable_ertm, "Disable enhanced retransmission mode");
Linus' kernel tree