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1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23*/
24
25/* Bluetooth HCI connection handling. */
26
27#include <linux/export.h>
28#include <linux/debugfs.h>
29
30#include <net/bluetooth/bluetooth.h>
31#include <net/bluetooth/hci_core.h>
32#include <net/bluetooth/l2cap.h>
33
34#include "hci_request.h"
35#include "smp.h"
36#include "a2mp.h"
37
38struct sco_param {
39 u16 pkt_type;
40 u16 max_latency;
41 u8 retrans_effort;
42};
43
44static const struct sco_param esco_param_cvsd[] = {
45 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
46 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
47 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
48 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
49 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
50};
51
52static const struct sco_param sco_param_cvsd[] = {
53 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
54 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
55};
56
57static const struct sco_param esco_param_msbc[] = {
58 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
59 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
60};
61
62/* This function requires the caller holds hdev->lock */
63static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
64{
65 struct hci_conn_params *params;
66 struct hci_dev *hdev = conn->hdev;
67 struct smp_irk *irk;
68 bdaddr_t *bdaddr;
69 u8 bdaddr_type;
70
71 bdaddr = &conn->dst;
72 bdaddr_type = conn->dst_type;
73
74 /* Check if we need to convert to identity address */
75 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
76 if (irk) {
77 bdaddr = &irk->bdaddr;
78 bdaddr_type = irk->addr_type;
79 }
80
81 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
82 bdaddr_type);
83 if (!params || !params->explicit_connect)
84 return;
85
86 /* The connection attempt was doing scan for new RPA, and is
87 * in scan phase. If params are not associated with any other
88 * autoconnect action, remove them completely. If they are, just unmark
89 * them as waiting for connection, by clearing explicit_connect field.
90 */
91 params->explicit_connect = false;
92
93 list_del_init(¶ms->action);
94
95 switch (params->auto_connect) {
96 case HCI_AUTO_CONN_EXPLICIT:
97 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
98 /* return instead of break to avoid duplicate scan update */
99 return;
100 case HCI_AUTO_CONN_DIRECT:
101 case HCI_AUTO_CONN_ALWAYS:
102 list_add(¶ms->action, &hdev->pend_le_conns);
103 break;
104 case HCI_AUTO_CONN_REPORT:
105 list_add(¶ms->action, &hdev->pend_le_reports);
106 break;
107 default:
108 break;
109 }
110
111 hci_update_background_scan(hdev);
112}
113
114static void hci_conn_cleanup(struct hci_conn *conn)
115{
116 struct hci_dev *hdev = conn->hdev;
117
118 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
119 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
120
121 hci_chan_list_flush(conn);
122
123 hci_conn_hash_del(hdev, conn);
124
125 if (hdev->notify)
126 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
127
128 hci_conn_del_sysfs(conn);
129
130 debugfs_remove_recursive(conn->debugfs);
131
132 hci_dev_put(hdev);
133
134 hci_conn_put(conn);
135}
136
137static void le_scan_cleanup(struct work_struct *work)
138{
139 struct hci_conn *conn = container_of(work, struct hci_conn,
140 le_scan_cleanup);
141 struct hci_dev *hdev = conn->hdev;
142 struct hci_conn *c = NULL;
143
144 BT_DBG("%s hcon %p", hdev->name, conn);
145
146 hci_dev_lock(hdev);
147
148 /* Check that the hci_conn is still around */
149 rcu_read_lock();
150 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
151 if (c == conn)
152 break;
153 }
154 rcu_read_unlock();
155
156 if (c == conn) {
157 hci_connect_le_scan_cleanup(conn);
158 hci_conn_cleanup(conn);
159 }
160
161 hci_dev_unlock(hdev);
162 hci_dev_put(hdev);
163 hci_conn_put(conn);
164}
165
166static void hci_connect_le_scan_remove(struct hci_conn *conn)
167{
168 BT_DBG("%s hcon %p", conn->hdev->name, conn);
169
170 /* We can't call hci_conn_del/hci_conn_cleanup here since that
171 * could deadlock with another hci_conn_del() call that's holding
172 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
173 * Instead, grab temporary extra references to the hci_dev and
174 * hci_conn and perform the necessary cleanup in a separate work
175 * callback.
176 */
177
178 hci_dev_hold(conn->hdev);
179 hci_conn_get(conn);
180
181 /* Even though we hold a reference to the hdev, many other
182 * things might get cleaned up meanwhile, including the hdev's
183 * own workqueue, so we can't use that for scheduling.
184 */
185 schedule_work(&conn->le_scan_cleanup);
186}
187
188static void hci_acl_create_connection(struct hci_conn *conn)
189{
190 struct hci_dev *hdev = conn->hdev;
191 struct inquiry_entry *ie;
192 struct hci_cp_create_conn cp;
193
194 BT_DBG("hcon %p", conn);
195
196 conn->state = BT_CONNECT;
197 conn->out = true;
198 conn->role = HCI_ROLE_MASTER;
199
200 conn->attempt++;
201
202 conn->link_policy = hdev->link_policy;
203
204 memset(&cp, 0, sizeof(cp));
205 bacpy(&cp.bdaddr, &conn->dst);
206 cp.pscan_rep_mode = 0x02;
207
208 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
209 if (ie) {
210 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
211 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
212 cp.pscan_mode = ie->data.pscan_mode;
213 cp.clock_offset = ie->data.clock_offset |
214 cpu_to_le16(0x8000);
215 }
216
217 memcpy(conn->dev_class, ie->data.dev_class, 3);
218 if (ie->data.ssp_mode > 0)
219 set_bit(HCI_CONN_SSP_ENABLED, &conn->flags);
220 }
221
222 cp.pkt_type = cpu_to_le16(conn->pkt_type);
223 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
224 cp.role_switch = 0x01;
225 else
226 cp.role_switch = 0x00;
227
228 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
229}
230
231int hci_disconnect(struct hci_conn *conn, __u8 reason)
232{
233 BT_DBG("hcon %p", conn);
234
235 /* When we are master of an established connection and it enters
236 * the disconnect timeout, then go ahead and try to read the
237 * current clock offset. Processing of the result is done
238 * within the event handling and hci_clock_offset_evt function.
239 */
240 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
241 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
242 struct hci_dev *hdev = conn->hdev;
243 struct hci_cp_read_clock_offset clkoff_cp;
244
245 clkoff_cp.handle = cpu_to_le16(conn->handle);
246 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
247 &clkoff_cp);
248 }
249
250 return hci_abort_conn(conn, reason);
251}
252
253static void hci_add_sco(struct hci_conn *conn, __u16 handle)
254{
255 struct hci_dev *hdev = conn->hdev;
256 struct hci_cp_add_sco cp;
257
258 BT_DBG("hcon %p", conn);
259
260 conn->state = BT_CONNECT;
261 conn->out = true;
262
263 conn->attempt++;
264
265 cp.handle = cpu_to_le16(handle);
266 cp.pkt_type = cpu_to_le16(conn->pkt_type);
267
268 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
269}
270
271bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
272{
273 struct hci_dev *hdev = conn->hdev;
274 struct hci_cp_setup_sync_conn cp;
275 const struct sco_param *param;
276
277 BT_DBG("hcon %p", conn);
278
279 conn->state = BT_CONNECT;
280 conn->out = true;
281
282 conn->attempt++;
283
284 cp.handle = cpu_to_le16(handle);
285
286 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
287 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
288 cp.voice_setting = cpu_to_le16(conn->setting);
289
290 switch (conn->setting & SCO_AIRMODE_MASK) {
291 case SCO_AIRMODE_TRANSP:
292 if (conn->attempt > ARRAY_SIZE(esco_param_msbc))
293 return false;
294 param = &esco_param_msbc[conn->attempt - 1];
295 break;
296 case SCO_AIRMODE_CVSD:
297 if (lmp_esco_capable(conn->link)) {
298 if (conn->attempt > ARRAY_SIZE(esco_param_cvsd))
299 return false;
300 param = &esco_param_cvsd[conn->attempt - 1];
301 } else {
302 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
303 return false;
304 param = &sco_param_cvsd[conn->attempt - 1];
305 }
306 break;
307 default:
308 return false;
309 }
310
311 cp.retrans_effort = param->retrans_effort;
312 cp.pkt_type = __cpu_to_le16(param->pkt_type);
313 cp.max_latency = __cpu_to_le16(param->max_latency);
314
315 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
316 return false;
317
318 return true;
319}
320
321u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
322 u16 to_multiplier)
323{
324 struct hci_dev *hdev = conn->hdev;
325 struct hci_conn_params *params;
326 struct hci_cp_le_conn_update cp;
327
328 hci_dev_lock(hdev);
329
330 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
331 if (params) {
332 params->conn_min_interval = min;
333 params->conn_max_interval = max;
334 params->conn_latency = latency;
335 params->supervision_timeout = to_multiplier;
336 }
337
338 hci_dev_unlock(hdev);
339
340 memset(&cp, 0, sizeof(cp));
341 cp.handle = cpu_to_le16(conn->handle);
342 cp.conn_interval_min = cpu_to_le16(min);
343 cp.conn_interval_max = cpu_to_le16(max);
344 cp.conn_latency = cpu_to_le16(latency);
345 cp.supervision_timeout = cpu_to_le16(to_multiplier);
346 cp.min_ce_len = cpu_to_le16(0x0000);
347 cp.max_ce_len = cpu_to_le16(0x0000);
348
349 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
350
351 if (params)
352 return 0x01;
353
354 return 0x00;
355}
356
357void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
358 __u8 ltk[16], __u8 key_size)
359{
360 struct hci_dev *hdev = conn->hdev;
361 struct hci_cp_le_start_enc cp;
362
363 BT_DBG("hcon %p", conn);
364
365 memset(&cp, 0, sizeof(cp));
366
367 cp.handle = cpu_to_le16(conn->handle);
368 cp.rand = rand;
369 cp.ediv = ediv;
370 memcpy(cp.ltk, ltk, key_size);
371
372 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
373}
374
375/* Device _must_ be locked */
376void hci_sco_setup(struct hci_conn *conn, __u8 status)
377{
378 struct hci_conn *sco = conn->link;
379
380 if (!sco)
381 return;
382
383 BT_DBG("hcon %p", conn);
384
385 if (!status) {
386 if (lmp_esco_capable(conn->hdev))
387 hci_setup_sync(sco, conn->handle);
388 else
389 hci_add_sco(sco, conn->handle);
390 } else {
391 hci_connect_cfm(sco, status);
392 hci_conn_del(sco);
393 }
394}
395
396static void hci_conn_timeout(struct work_struct *work)
397{
398 struct hci_conn *conn = container_of(work, struct hci_conn,
399 disc_work.work);
400 int refcnt = atomic_read(&conn->refcnt);
401
402 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
403
404 WARN_ON(refcnt < 0);
405
406 /* FIXME: It was observed that in pairing failed scenario, refcnt
407 * drops below 0. Probably this is because l2cap_conn_del calls
408 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
409 * dropped. After that loop hci_chan_del is called which also drops
410 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
411 * otherwise drop it.
412 */
413 if (refcnt > 0)
414 return;
415
416 /* LE connections in scanning state need special handling */
417 if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
418 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
419 hci_connect_le_scan_remove(conn);
420 return;
421 }
422
423 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
424}
425
426/* Enter sniff mode */
427static void hci_conn_idle(struct work_struct *work)
428{
429 struct hci_conn *conn = container_of(work, struct hci_conn,
430 idle_work.work);
431 struct hci_dev *hdev = conn->hdev;
432
433 BT_DBG("hcon %p mode %d", conn, conn->mode);
434
435 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
436 return;
437
438 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
439 return;
440
441 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
442 struct hci_cp_sniff_subrate cp;
443 cp.handle = cpu_to_le16(conn->handle);
444 cp.max_latency = cpu_to_le16(0);
445 cp.min_remote_timeout = cpu_to_le16(0);
446 cp.min_local_timeout = cpu_to_le16(0);
447 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
448 }
449
450 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
451 struct hci_cp_sniff_mode cp;
452 cp.handle = cpu_to_le16(conn->handle);
453 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
454 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
455 cp.attempt = cpu_to_le16(4);
456 cp.timeout = cpu_to_le16(1);
457 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
458 }
459}
460
461static void hci_conn_auto_accept(struct work_struct *work)
462{
463 struct hci_conn *conn = container_of(work, struct hci_conn,
464 auto_accept_work.work);
465
466 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
467 &conn->dst);
468}
469
470static void le_conn_timeout(struct work_struct *work)
471{
472 struct hci_conn *conn = container_of(work, struct hci_conn,
473 le_conn_timeout.work);
474 struct hci_dev *hdev = conn->hdev;
475
476 BT_DBG("");
477
478 /* We could end up here due to having done directed advertising,
479 * so clean up the state if necessary. This should however only
480 * happen with broken hardware or if low duty cycle was used
481 * (which doesn't have a timeout of its own).
482 */
483 if (conn->role == HCI_ROLE_SLAVE) {
484 u8 enable = 0x00;
485 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
486 &enable);
487 hci_le_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
488 return;
489 }
490
491 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
492}
493
494struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
495 u8 role)
496{
497 struct hci_conn *conn;
498
499 BT_DBG("%s dst %pMR", hdev->name, dst);
500
501 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
502 if (!conn)
503 return NULL;
504
505 bacpy(&conn->dst, dst);
506 bacpy(&conn->src, &hdev->bdaddr);
507 conn->hdev = hdev;
508 conn->type = type;
509 conn->role = role;
510 conn->mode = HCI_CM_ACTIVE;
511 conn->state = BT_OPEN;
512 conn->auth_type = HCI_AT_GENERAL_BONDING;
513 conn->io_capability = hdev->io_capability;
514 conn->remote_auth = 0xff;
515 conn->key_type = 0xff;
516 conn->rssi = HCI_RSSI_INVALID;
517 conn->tx_power = HCI_TX_POWER_INVALID;
518 conn->max_tx_power = HCI_TX_POWER_INVALID;
519
520 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
521 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
522
523 if (conn->role == HCI_ROLE_MASTER)
524 conn->out = true;
525
526 switch (type) {
527 case ACL_LINK:
528 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
529 break;
530 case LE_LINK:
531 /* conn->src should reflect the local identity address */
532 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
533 break;
534 case SCO_LINK:
535 if (lmp_esco_capable(hdev))
536 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
537 (hdev->esco_type & EDR_ESCO_MASK);
538 else
539 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
540 break;
541 case ESCO_LINK:
542 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
543 break;
544 }
545
546 skb_queue_head_init(&conn->data_q);
547
548 INIT_LIST_HEAD(&conn->chan_list);
549
550 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
551 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
552 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
553 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
554 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
555
556 atomic_set(&conn->refcnt, 0);
557
558 hci_dev_hold(hdev);
559
560 hci_conn_hash_add(hdev, conn);
561 if (hdev->notify)
562 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
563
564 hci_conn_init_sysfs(conn);
565
566 return conn;
567}
568
569int hci_conn_del(struct hci_conn *conn)
570{
571 struct hci_dev *hdev = conn->hdev;
572
573 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
574
575 cancel_delayed_work_sync(&conn->disc_work);
576 cancel_delayed_work_sync(&conn->auto_accept_work);
577 cancel_delayed_work_sync(&conn->idle_work);
578
579 if (conn->type == ACL_LINK) {
580 struct hci_conn *sco = conn->link;
581 if (sco)
582 sco->link = NULL;
583
584 /* Unacked frames */
585 hdev->acl_cnt += conn->sent;
586 } else if (conn->type == LE_LINK) {
587 cancel_delayed_work(&conn->le_conn_timeout);
588
589 if (hdev->le_pkts)
590 hdev->le_cnt += conn->sent;
591 else
592 hdev->acl_cnt += conn->sent;
593 } else {
594 struct hci_conn *acl = conn->link;
595 if (acl) {
596 acl->link = NULL;
597 hci_conn_drop(acl);
598 }
599 }
600
601 if (conn->amp_mgr)
602 amp_mgr_put(conn->amp_mgr);
603
604 skb_queue_purge(&conn->data_q);
605
606 /* Remove the connection from the list and cleanup its remaining
607 * state. This is a separate function since for some cases like
608 * BT_CONNECT_SCAN we *only* want the cleanup part without the
609 * rest of hci_conn_del.
610 */
611 hci_conn_cleanup(conn);
612
613 return 0;
614}
615
616struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
617{
618 int use_src = bacmp(src, BDADDR_ANY);
619 struct hci_dev *hdev = NULL, *d;
620
621 BT_DBG("%pMR -> %pMR", src, dst);
622
623 read_lock(&hci_dev_list_lock);
624
625 list_for_each_entry(d, &hci_dev_list, list) {
626 if (!test_bit(HCI_UP, &d->flags) ||
627 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
628 d->dev_type != HCI_BREDR)
629 continue;
630
631 /* Simple routing:
632 * No source address - find interface with bdaddr != dst
633 * Source address - find interface with bdaddr == src
634 */
635
636 if (use_src) {
637 if (!bacmp(&d->bdaddr, src)) {
638 hdev = d; break;
639 }
640 } else {
641 if (bacmp(&d->bdaddr, dst)) {
642 hdev = d; break;
643 }
644 }
645 }
646
647 if (hdev)
648 hdev = hci_dev_hold(hdev);
649
650 read_unlock(&hci_dev_list_lock);
651 return hdev;
652}
653EXPORT_SYMBOL(hci_get_route);
654
655/* This function requires the caller holds hdev->lock */
656void hci_le_conn_failed(struct hci_conn *conn, u8 status)
657{
658 struct hci_dev *hdev = conn->hdev;
659 struct hci_conn_params *params;
660
661 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
662 conn->dst_type);
663 if (params && params->conn) {
664 hci_conn_drop(params->conn);
665 hci_conn_put(params->conn);
666 params->conn = NULL;
667 }
668
669 conn->state = BT_CLOSED;
670
671 /* If the status indicates successful cancellation of
672 * the attempt (i.e. Unkown Connection Id) there's no point of
673 * notifying failure since we'll go back to keep trying to
674 * connect. The only exception is explicit connect requests
675 * where a timeout + cancel does indicate an actual failure.
676 */
677 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
678 (params && params->explicit_connect))
679 mgmt_connect_failed(hdev, &conn->dst, conn->type,
680 conn->dst_type, status);
681
682 hci_connect_cfm(conn, status);
683
684 hci_conn_del(conn);
685
686 /* Since we may have temporarily stopped the background scanning in
687 * favor of connection establishment, we should restart it.
688 */
689 hci_update_background_scan(hdev);
690
691 /* Re-enable advertising in case this was a failed connection
692 * attempt as a peripheral.
693 */
694 hci_req_reenable_advertising(hdev);
695}
696
697static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
698{
699 struct hci_conn *conn;
700
701 hci_dev_lock(hdev);
702
703 conn = hci_lookup_le_connect(hdev);
704
705 if (!status) {
706 hci_connect_le_scan_cleanup(conn);
707 goto done;
708 }
709
710 BT_ERR("HCI request failed to create LE connection: status 0x%2.2x",
711 status);
712
713 if (!conn)
714 goto done;
715
716 hci_le_conn_failed(conn, status);
717
718done:
719 hci_dev_unlock(hdev);
720}
721
722static bool conn_use_rpa(struct hci_conn *conn)
723{
724 struct hci_dev *hdev = conn->hdev;
725
726 return hci_dev_test_flag(hdev, HCI_PRIVACY);
727}
728
729static void hci_req_add_le_create_conn(struct hci_request *req,
730 struct hci_conn *conn)
731{
732 struct hci_cp_le_create_conn cp;
733 struct hci_dev *hdev = conn->hdev;
734 u8 own_addr_type;
735
736 /* Update random address, but set require_privacy to false so
737 * that we never connect with an non-resolvable address.
738 */
739 if (hci_update_random_address(req, false, conn_use_rpa(conn),
740 &own_addr_type))
741 return;
742
743 memset(&cp, 0, sizeof(cp));
744
745 /* Set window to be the same value as the interval to enable
746 * continuous scanning.
747 */
748 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
749 cp.scan_window = cp.scan_interval;
750
751 bacpy(&cp.peer_addr, &conn->dst);
752 cp.peer_addr_type = conn->dst_type;
753 cp.own_address_type = own_addr_type;
754 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
755 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
756 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
757 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
758 cp.min_ce_len = cpu_to_le16(0x0000);
759 cp.max_ce_len = cpu_to_le16(0x0000);
760
761 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
762
763 conn->state = BT_CONNECT;
764 clear_bit(HCI_CONN_SCANNING, &conn->flags);
765}
766
767static void hci_req_directed_advertising(struct hci_request *req,
768 struct hci_conn *conn)
769{
770 struct hci_dev *hdev = req->hdev;
771 struct hci_cp_le_set_adv_param cp;
772 u8 own_addr_type;
773 u8 enable;
774
775 /* Clear the HCI_LE_ADV bit temporarily so that the
776 * hci_update_random_address knows that it's safe to go ahead
777 * and write a new random address. The flag will be set back on
778 * as soon as the SET_ADV_ENABLE HCI command completes.
779 */
780 hci_dev_clear_flag(hdev, HCI_LE_ADV);
781
782 /* Set require_privacy to false so that the remote device has a
783 * chance of identifying us.
784 */
785 if (hci_update_random_address(req, false, conn_use_rpa(conn),
786 &own_addr_type) < 0)
787 return;
788
789 memset(&cp, 0, sizeof(cp));
790 cp.type = LE_ADV_DIRECT_IND;
791 cp.own_address_type = own_addr_type;
792 cp.direct_addr_type = conn->dst_type;
793 bacpy(&cp.direct_addr, &conn->dst);
794 cp.channel_map = hdev->le_adv_channel_map;
795
796 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
797
798 enable = 0x01;
799 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
800
801 conn->state = BT_CONNECT;
802}
803
804struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
805 u8 dst_type, u8 sec_level, u16 conn_timeout,
806 u8 role)
807{
808 struct hci_conn_params *params;
809 struct hci_conn *conn;
810 struct smp_irk *irk;
811 struct hci_request req;
812 int err;
813
814 /* Let's make sure that le is enabled.*/
815 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
816 if (lmp_le_capable(hdev))
817 return ERR_PTR(-ECONNREFUSED);
818
819 return ERR_PTR(-EOPNOTSUPP);
820 }
821
822 /* Since the controller supports only one LE connection attempt at a
823 * time, we return -EBUSY if there is any connection attempt running.
824 */
825 if (hci_lookup_le_connect(hdev))
826 return ERR_PTR(-EBUSY);
827
828 /* If there's already a connection object but it's not in
829 * scanning state it means it must already be established, in
830 * which case we can't do anything else except report a failure
831 * to connect.
832 */
833 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
834 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
835 return ERR_PTR(-EBUSY);
836 }
837
838 /* When given an identity address with existing identity
839 * resolving key, the connection needs to be established
840 * to a resolvable random address.
841 *
842 * Storing the resolvable random address is required here
843 * to handle connection failures. The address will later
844 * be resolved back into the original identity address
845 * from the connect request.
846 */
847 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
848 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
849 dst = &irk->rpa;
850 dst_type = ADDR_LE_DEV_RANDOM;
851 }
852
853 if (conn) {
854 bacpy(&conn->dst, dst);
855 } else {
856 conn = hci_conn_add(hdev, LE_LINK, dst, role);
857 if (!conn)
858 return ERR_PTR(-ENOMEM);
859 hci_conn_hold(conn);
860 conn->pending_sec_level = sec_level;
861 }
862
863 conn->dst_type = dst_type;
864 conn->sec_level = BT_SECURITY_LOW;
865 conn->conn_timeout = conn_timeout;
866
867 hci_req_init(&req, hdev);
868
869 /* Disable advertising if we're active. For master role
870 * connections most controllers will refuse to connect if
871 * advertising is enabled, and for slave role connections we
872 * anyway have to disable it in order to start directed
873 * advertising.
874 */
875 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
876 u8 enable = 0x00;
877 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
878 &enable);
879 }
880
881 /* If requested to connect as slave use directed advertising */
882 if (conn->role == HCI_ROLE_SLAVE) {
883 /* If we're active scanning most controllers are unable
884 * to initiate advertising. Simply reject the attempt.
885 */
886 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
887 hdev->le_scan_type == LE_SCAN_ACTIVE) {
888 skb_queue_purge(&req.cmd_q);
889 hci_conn_del(conn);
890 return ERR_PTR(-EBUSY);
891 }
892
893 hci_req_directed_advertising(&req, conn);
894 goto create_conn;
895 }
896
897 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
898 if (params) {
899 conn->le_conn_min_interval = params->conn_min_interval;
900 conn->le_conn_max_interval = params->conn_max_interval;
901 conn->le_conn_latency = params->conn_latency;
902 conn->le_supv_timeout = params->supervision_timeout;
903 } else {
904 conn->le_conn_min_interval = hdev->le_conn_min_interval;
905 conn->le_conn_max_interval = hdev->le_conn_max_interval;
906 conn->le_conn_latency = hdev->le_conn_latency;
907 conn->le_supv_timeout = hdev->le_supv_timeout;
908 }
909
910 /* If controller is scanning, we stop it since some controllers are
911 * not able to scan and connect at the same time. Also set the
912 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
913 * handler for scan disabling knows to set the correct discovery
914 * state.
915 */
916 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
917 hci_req_add_le_scan_disable(&req);
918 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
919 }
920
921 hci_req_add_le_create_conn(&req, conn);
922
923create_conn:
924 err = hci_req_run(&req, create_le_conn_complete);
925 if (err) {
926 hci_conn_del(conn);
927 return ERR_PTR(err);
928 }
929
930 return conn;
931}
932
933static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
934{
935 struct hci_conn *conn;
936
937 conn = hci_conn_hash_lookup_le(hdev, addr, type);
938 if (!conn)
939 return false;
940
941 if (conn->state != BT_CONNECTED)
942 return false;
943
944 return true;
945}
946
947/* This function requires the caller holds hdev->lock */
948static int hci_explicit_conn_params_set(struct hci_dev *hdev,
949 bdaddr_t *addr, u8 addr_type)
950{
951 struct hci_conn_params *params;
952
953 if (is_connected(hdev, addr, addr_type))
954 return -EISCONN;
955
956 params = hci_conn_params_lookup(hdev, addr, addr_type);
957 if (!params) {
958 params = hci_conn_params_add(hdev, addr, addr_type);
959 if (!params)
960 return -ENOMEM;
961
962 /* If we created new params, mark them to be deleted in
963 * hci_connect_le_scan_cleanup. It's different case than
964 * existing disabled params, those will stay after cleanup.
965 */
966 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
967 }
968
969 /* We're trying to connect, so make sure params are at pend_le_conns */
970 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
971 params->auto_connect == HCI_AUTO_CONN_REPORT ||
972 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
973 list_del_init(¶ms->action);
974 list_add(¶ms->action, &hdev->pend_le_conns);
975 }
976
977 params->explicit_connect = true;
978
979 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
980 params->auto_connect);
981
982 return 0;
983}
984
985/* This function requires the caller holds hdev->lock */
986struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
987 u8 dst_type, u8 sec_level,
988 u16 conn_timeout)
989{
990 struct hci_conn *conn;
991
992 /* Let's make sure that le is enabled.*/
993 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
994 if (lmp_le_capable(hdev))
995 return ERR_PTR(-ECONNREFUSED);
996
997 return ERR_PTR(-EOPNOTSUPP);
998 }
999
1000 /* Some devices send ATT messages as soon as the physical link is
1001 * established. To be able to handle these ATT messages, the user-
1002 * space first establishes the connection and then starts the pairing
1003 * process.
1004 *
1005 * So if a hci_conn object already exists for the following connection
1006 * attempt, we simply update pending_sec_level and auth_type fields
1007 * and return the object found.
1008 */
1009 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1010 if (conn) {
1011 if (conn->pending_sec_level < sec_level)
1012 conn->pending_sec_level = sec_level;
1013 goto done;
1014 }
1015
1016 BT_DBG("requesting refresh of dst_addr");
1017
1018 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1019 if (!conn)
1020 return ERR_PTR(-ENOMEM);
1021
1022 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1023 return ERR_PTR(-EBUSY);
1024
1025 conn->state = BT_CONNECT;
1026 set_bit(HCI_CONN_SCANNING, &conn->flags);
1027 conn->dst_type = dst_type;
1028 conn->sec_level = BT_SECURITY_LOW;
1029 conn->pending_sec_level = sec_level;
1030 conn->conn_timeout = conn_timeout;
1031
1032 hci_update_background_scan(hdev);
1033
1034done:
1035 hci_conn_hold(conn);
1036 return conn;
1037}
1038
1039struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1040 u8 sec_level, u8 auth_type)
1041{
1042 struct hci_conn *acl;
1043
1044 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1045 if (lmp_bredr_capable(hdev))
1046 return ERR_PTR(-ECONNREFUSED);
1047
1048 return ERR_PTR(-EOPNOTSUPP);
1049 }
1050
1051 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1052 if (!acl) {
1053 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1054 if (!acl)
1055 return ERR_PTR(-ENOMEM);
1056 }
1057
1058 hci_conn_hold(acl);
1059
1060 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1061 acl->sec_level = BT_SECURITY_LOW;
1062 acl->pending_sec_level = sec_level;
1063 acl->auth_type = auth_type;
1064 hci_acl_create_connection(acl);
1065 }
1066
1067 return acl;
1068}
1069
1070struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1071 __u16 setting)
1072{
1073 struct hci_conn *acl;
1074 struct hci_conn *sco;
1075
1076 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1077 if (IS_ERR(acl))
1078 return acl;
1079
1080 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1081 if (!sco) {
1082 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1083 if (!sco) {
1084 hci_conn_drop(acl);
1085 return ERR_PTR(-ENOMEM);
1086 }
1087 }
1088
1089 acl->link = sco;
1090 sco->link = acl;
1091
1092 hci_conn_hold(sco);
1093
1094 sco->setting = setting;
1095
1096 if (acl->state == BT_CONNECTED &&
1097 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1098 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1099 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1100
1101 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1102 /* defer SCO setup until mode change completed */
1103 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1104 return sco;
1105 }
1106
1107 hci_sco_setup(acl, 0x00);
1108 }
1109
1110 return sco;
1111}
1112
1113/* Check link security requirement */
1114int hci_conn_check_link_mode(struct hci_conn *conn)
1115{
1116 BT_DBG("hcon %p", conn);
1117
1118 /* In Secure Connections Only mode, it is required that Secure
1119 * Connections is used and the link is encrypted with AES-CCM
1120 * using a P-256 authenticated combination key.
1121 */
1122 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1123 if (!hci_conn_sc_enabled(conn) ||
1124 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1125 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1126 return 0;
1127 }
1128
1129 if (hci_conn_ssp_enabled(conn) &&
1130 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1131 return 0;
1132
1133 return 1;
1134}
1135
1136/* Authenticate remote device */
1137static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1138{
1139 BT_DBG("hcon %p", conn);
1140
1141 if (conn->pending_sec_level > sec_level)
1142 sec_level = conn->pending_sec_level;
1143
1144 if (sec_level > conn->sec_level)
1145 conn->pending_sec_level = sec_level;
1146 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1147 return 1;
1148
1149 /* Make sure we preserve an existing MITM requirement*/
1150 auth_type |= (conn->auth_type & 0x01);
1151
1152 conn->auth_type = auth_type;
1153
1154 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1155 struct hci_cp_auth_requested cp;
1156
1157 cp.handle = cpu_to_le16(conn->handle);
1158 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1159 sizeof(cp), &cp);
1160
1161 /* If we're already encrypted set the REAUTH_PEND flag,
1162 * otherwise set the ENCRYPT_PEND.
1163 */
1164 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1165 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1166 else
1167 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1168 }
1169
1170 return 0;
1171}
1172
1173/* Encrypt the the link */
1174static void hci_conn_encrypt(struct hci_conn *conn)
1175{
1176 BT_DBG("hcon %p", conn);
1177
1178 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1179 struct hci_cp_set_conn_encrypt cp;
1180 cp.handle = cpu_to_le16(conn->handle);
1181 cp.encrypt = 0x01;
1182 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1183 &cp);
1184 }
1185}
1186
1187/* Enable security */
1188int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1189 bool initiator)
1190{
1191 BT_DBG("hcon %p", conn);
1192
1193 if (conn->type == LE_LINK)
1194 return smp_conn_security(conn, sec_level);
1195
1196 /* For sdp we don't need the link key. */
1197 if (sec_level == BT_SECURITY_SDP)
1198 return 1;
1199
1200 /* For non 2.1 devices and low security level we don't need the link
1201 key. */
1202 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1203 return 1;
1204
1205 /* For other security levels we need the link key. */
1206 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1207 goto auth;
1208
1209 /* An authenticated FIPS approved combination key has sufficient
1210 * security for security level 4. */
1211 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1212 sec_level == BT_SECURITY_FIPS)
1213 goto encrypt;
1214
1215 /* An authenticated combination key has sufficient security for
1216 security level 3. */
1217 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1218 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1219 sec_level == BT_SECURITY_HIGH)
1220 goto encrypt;
1221
1222 /* An unauthenticated combination key has sufficient security for
1223 security level 1 and 2. */
1224 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1225 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1226 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1227 goto encrypt;
1228
1229 /* A combination key has always sufficient security for the security
1230 levels 1 or 2. High security level requires the combination key
1231 is generated using maximum PIN code length (16).
1232 For pre 2.1 units. */
1233 if (conn->key_type == HCI_LK_COMBINATION &&
1234 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1235 conn->pin_length == 16))
1236 goto encrypt;
1237
1238auth:
1239 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1240 return 0;
1241
1242 if (initiator)
1243 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1244
1245 if (!hci_conn_auth(conn, sec_level, auth_type))
1246 return 0;
1247
1248encrypt:
1249 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1250 return 1;
1251
1252 hci_conn_encrypt(conn);
1253 return 0;
1254}
1255EXPORT_SYMBOL(hci_conn_security);
1256
1257/* Check secure link requirement */
1258int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1259{
1260 BT_DBG("hcon %p", conn);
1261
1262 /* Accept if non-secure or higher security level is required */
1263 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1264 return 1;
1265
1266 /* Accept if secure or higher security level is already present */
1267 if (conn->sec_level == BT_SECURITY_HIGH ||
1268 conn->sec_level == BT_SECURITY_FIPS)
1269 return 1;
1270
1271 /* Reject not secure link */
1272 return 0;
1273}
1274EXPORT_SYMBOL(hci_conn_check_secure);
1275
1276/* Switch role */
1277int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1278{
1279 BT_DBG("hcon %p", conn);
1280
1281 if (role == conn->role)
1282 return 1;
1283
1284 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1285 struct hci_cp_switch_role cp;
1286 bacpy(&cp.bdaddr, &conn->dst);
1287 cp.role = role;
1288 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1289 }
1290
1291 return 0;
1292}
1293EXPORT_SYMBOL(hci_conn_switch_role);
1294
1295/* Enter active mode */
1296void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1297{
1298 struct hci_dev *hdev = conn->hdev;
1299
1300 BT_DBG("hcon %p mode %d", conn, conn->mode);
1301
1302 if (conn->mode != HCI_CM_SNIFF)
1303 goto timer;
1304
1305 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1306 goto timer;
1307
1308 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1309 struct hci_cp_exit_sniff_mode cp;
1310 cp.handle = cpu_to_le16(conn->handle);
1311 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1312 }
1313
1314timer:
1315 if (hdev->idle_timeout > 0)
1316 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1317 msecs_to_jiffies(hdev->idle_timeout));
1318}
1319
1320/* Drop all connection on the device */
1321void hci_conn_hash_flush(struct hci_dev *hdev)
1322{
1323 struct hci_conn_hash *h = &hdev->conn_hash;
1324 struct hci_conn *c, *n;
1325
1326 BT_DBG("hdev %s", hdev->name);
1327
1328 list_for_each_entry_safe(c, n, &h->list, list) {
1329 c->state = BT_CLOSED;
1330
1331 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1332 hci_conn_del(c);
1333 }
1334}
1335
1336/* Check pending connect attempts */
1337void hci_conn_check_pending(struct hci_dev *hdev)
1338{
1339 struct hci_conn *conn;
1340
1341 BT_DBG("hdev %s", hdev->name);
1342
1343 hci_dev_lock(hdev);
1344
1345 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1346 if (conn)
1347 hci_acl_create_connection(conn);
1348
1349 hci_dev_unlock(hdev);
1350}
1351
1352static u32 get_link_mode(struct hci_conn *conn)
1353{
1354 u32 link_mode = 0;
1355
1356 if (conn->role == HCI_ROLE_MASTER)
1357 link_mode |= HCI_LM_MASTER;
1358
1359 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1360 link_mode |= HCI_LM_ENCRYPT;
1361
1362 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1363 link_mode |= HCI_LM_AUTH;
1364
1365 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1366 link_mode |= HCI_LM_SECURE;
1367
1368 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1369 link_mode |= HCI_LM_FIPS;
1370
1371 return link_mode;
1372}
1373
1374int hci_get_conn_list(void __user *arg)
1375{
1376 struct hci_conn *c;
1377 struct hci_conn_list_req req, *cl;
1378 struct hci_conn_info *ci;
1379 struct hci_dev *hdev;
1380 int n = 0, size, err;
1381
1382 if (copy_from_user(&req, arg, sizeof(req)))
1383 return -EFAULT;
1384
1385 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1386 return -EINVAL;
1387
1388 size = sizeof(req) + req.conn_num * sizeof(*ci);
1389
1390 cl = kmalloc(size, GFP_KERNEL);
1391 if (!cl)
1392 return -ENOMEM;
1393
1394 hdev = hci_dev_get(req.dev_id);
1395 if (!hdev) {
1396 kfree(cl);
1397 return -ENODEV;
1398 }
1399
1400 ci = cl->conn_info;
1401
1402 hci_dev_lock(hdev);
1403 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1404 bacpy(&(ci + n)->bdaddr, &c->dst);
1405 (ci + n)->handle = c->handle;
1406 (ci + n)->type = c->type;
1407 (ci + n)->out = c->out;
1408 (ci + n)->state = c->state;
1409 (ci + n)->link_mode = get_link_mode(c);
1410 if (++n >= req.conn_num)
1411 break;
1412 }
1413 hci_dev_unlock(hdev);
1414
1415 cl->dev_id = hdev->id;
1416 cl->conn_num = n;
1417 size = sizeof(req) + n * sizeof(*ci);
1418
1419 hci_dev_put(hdev);
1420
1421 err = copy_to_user(arg, cl, size);
1422 kfree(cl);
1423
1424 return err ? -EFAULT : 0;
1425}
1426
1427int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1428{
1429 struct hci_conn_info_req req;
1430 struct hci_conn_info ci;
1431 struct hci_conn *conn;
1432 char __user *ptr = arg + sizeof(req);
1433
1434 if (copy_from_user(&req, arg, sizeof(req)))
1435 return -EFAULT;
1436
1437 hci_dev_lock(hdev);
1438 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1439 if (conn) {
1440 bacpy(&ci.bdaddr, &conn->dst);
1441 ci.handle = conn->handle;
1442 ci.type = conn->type;
1443 ci.out = conn->out;
1444 ci.state = conn->state;
1445 ci.link_mode = get_link_mode(conn);
1446 }
1447 hci_dev_unlock(hdev);
1448
1449 if (!conn)
1450 return -ENOENT;
1451
1452 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1453}
1454
1455int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1456{
1457 struct hci_auth_info_req req;
1458 struct hci_conn *conn;
1459
1460 if (copy_from_user(&req, arg, sizeof(req)))
1461 return -EFAULT;
1462
1463 hci_dev_lock(hdev);
1464 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1465 if (conn)
1466 req.type = conn->auth_type;
1467 hci_dev_unlock(hdev);
1468
1469 if (!conn)
1470 return -ENOENT;
1471
1472 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1473}
1474
1475struct hci_chan *hci_chan_create(struct hci_conn *conn)
1476{
1477 struct hci_dev *hdev = conn->hdev;
1478 struct hci_chan *chan;
1479
1480 BT_DBG("%s hcon %p", hdev->name, conn);
1481
1482 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1483 BT_DBG("Refusing to create new hci_chan");
1484 return NULL;
1485 }
1486
1487 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1488 if (!chan)
1489 return NULL;
1490
1491 chan->conn = hci_conn_get(conn);
1492 skb_queue_head_init(&chan->data_q);
1493 chan->state = BT_CONNECTED;
1494
1495 list_add_rcu(&chan->list, &conn->chan_list);
1496
1497 return chan;
1498}
1499
1500void hci_chan_del(struct hci_chan *chan)
1501{
1502 struct hci_conn *conn = chan->conn;
1503 struct hci_dev *hdev = conn->hdev;
1504
1505 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1506
1507 list_del_rcu(&chan->list);
1508
1509 synchronize_rcu();
1510
1511 /* Prevent new hci_chan's to be created for this hci_conn */
1512 set_bit(HCI_CONN_DROP, &conn->flags);
1513
1514 hci_conn_put(conn);
1515
1516 skb_queue_purge(&chan->data_q);
1517 kfree(chan);
1518}
1519
1520void hci_chan_list_flush(struct hci_conn *conn)
1521{
1522 struct hci_chan *chan, *n;
1523
1524 BT_DBG("hcon %p", conn);
1525
1526 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1527 hci_chan_del(chan);
1528}
1529
1530static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1531 __u16 handle)
1532{
1533 struct hci_chan *hchan;
1534
1535 list_for_each_entry(hchan, &hcon->chan_list, list) {
1536 if (hchan->handle == handle)
1537 return hchan;
1538 }
1539
1540 return NULL;
1541}
1542
1543struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1544{
1545 struct hci_conn_hash *h = &hdev->conn_hash;
1546 struct hci_conn *hcon;
1547 struct hci_chan *hchan = NULL;
1548
1549 rcu_read_lock();
1550
1551 list_for_each_entry_rcu(hcon, &h->list, list) {
1552 hchan = __hci_chan_lookup_handle(hcon, handle);
1553 if (hchan)
1554 break;
1555 }
1556
1557 rcu_read_unlock();
1558
1559 return hchan;
1560}
1/*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.
4 Copyright 2023-2024 NXP
5
6 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License version 2 as
10 published by the Free Software Foundation;
11
12 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
13 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
15 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
16 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
17 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
18 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
19 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20
21 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
22 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
23 SOFTWARE IS DISCLAIMED.
24*/
25
26/* Bluetooth HCI connection handling. */
27
28#include <linux/export.h>
29#include <linux/debugfs.h>
30
31#include <net/bluetooth/bluetooth.h>
32#include <net/bluetooth/hci_core.h>
33#include <net/bluetooth/l2cap.h>
34#include <net/bluetooth/iso.h>
35#include <net/bluetooth/mgmt.h>
36
37#include "hci_request.h"
38#include "smp.h"
39#include "eir.h"
40
41struct sco_param {
42 u16 pkt_type;
43 u16 max_latency;
44 u8 retrans_effort;
45};
46
47struct conn_handle_t {
48 struct hci_conn *conn;
49 __u16 handle;
50};
51
52static const struct sco_param esco_param_cvsd[] = {
53 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000a, 0x01 }, /* S3 */
54 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x0007, 0x01 }, /* S2 */
55 { EDR_ESCO_MASK | ESCO_EV3, 0x0007, 0x01 }, /* S1 */
56 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0x01 }, /* D1 */
57 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0x01 }, /* D0 */
58};
59
60static const struct sco_param sco_param_cvsd[] = {
61 { EDR_ESCO_MASK | ESCO_HV3, 0xffff, 0xff }, /* D1 */
62 { EDR_ESCO_MASK | ESCO_HV1, 0xffff, 0xff }, /* D0 */
63};
64
65static const struct sco_param esco_param_msbc[] = {
66 { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
67 { EDR_ESCO_MASK | ESCO_EV3, 0x0008, 0x02 }, /* T1 */
68};
69
70/* This function requires the caller holds hdev->lock */
71void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status)
72{
73 struct hci_conn_params *params;
74 struct hci_dev *hdev = conn->hdev;
75 struct smp_irk *irk;
76 bdaddr_t *bdaddr;
77 u8 bdaddr_type;
78
79 bdaddr = &conn->dst;
80 bdaddr_type = conn->dst_type;
81
82 /* Check if we need to convert to identity address */
83 irk = hci_get_irk(hdev, bdaddr, bdaddr_type);
84 if (irk) {
85 bdaddr = &irk->bdaddr;
86 bdaddr_type = irk->addr_type;
87 }
88
89 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
90 bdaddr_type);
91 if (!params)
92 return;
93
94 if (params->conn) {
95 hci_conn_drop(params->conn);
96 hci_conn_put(params->conn);
97 params->conn = NULL;
98 }
99
100 if (!params->explicit_connect)
101 return;
102
103 /* If the status indicates successful cancellation of
104 * the attempt (i.e. Unknown Connection Id) there's no point of
105 * notifying failure since we'll go back to keep trying to
106 * connect. The only exception is explicit connect requests
107 * where a timeout + cancel does indicate an actual failure.
108 */
109 if (status && status != HCI_ERROR_UNKNOWN_CONN_ID)
110 mgmt_connect_failed(hdev, &conn->dst, conn->type,
111 conn->dst_type, status);
112
113 /* The connection attempt was doing scan for new RPA, and is
114 * in scan phase. If params are not associated with any other
115 * autoconnect action, remove them completely. If they are, just unmark
116 * them as waiting for connection, by clearing explicit_connect field.
117 */
118 params->explicit_connect = false;
119
120 hci_pend_le_list_del_init(params);
121
122 switch (params->auto_connect) {
123 case HCI_AUTO_CONN_EXPLICIT:
124 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
125 /* return instead of break to avoid duplicate scan update */
126 return;
127 case HCI_AUTO_CONN_DIRECT:
128 case HCI_AUTO_CONN_ALWAYS:
129 hci_pend_le_list_add(params, &hdev->pend_le_conns);
130 break;
131 case HCI_AUTO_CONN_REPORT:
132 hci_pend_le_list_add(params, &hdev->pend_le_reports);
133 break;
134 default:
135 break;
136 }
137
138 hci_update_passive_scan(hdev);
139}
140
141static void hci_conn_cleanup(struct hci_conn *conn)
142{
143 struct hci_dev *hdev = conn->hdev;
144
145 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
146 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
147
148 if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
149 hci_remove_link_key(hdev, &conn->dst);
150
151 hci_chan_list_flush(conn);
152
153 hci_conn_hash_del(hdev, conn);
154
155 if (HCI_CONN_HANDLE_UNSET(conn->handle))
156 ida_free(&hdev->unset_handle_ida, conn->handle);
157
158 if (conn->cleanup)
159 conn->cleanup(conn);
160
161 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
162 switch (conn->setting & SCO_AIRMODE_MASK) {
163 case SCO_AIRMODE_CVSD:
164 case SCO_AIRMODE_TRANSP:
165 if (hdev->notify)
166 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
167 break;
168 }
169 } else {
170 if (hdev->notify)
171 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
172 }
173
174 debugfs_remove_recursive(conn->debugfs);
175
176 hci_conn_del_sysfs(conn);
177
178 hci_dev_put(hdev);
179}
180
181int hci_disconnect(struct hci_conn *conn, __u8 reason)
182{
183 BT_DBG("hcon %p", conn);
184
185 /* When we are central of an established connection and it enters
186 * the disconnect timeout, then go ahead and try to read the
187 * current clock offset. Processing of the result is done
188 * within the event handling and hci_clock_offset_evt function.
189 */
190 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
191 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
192 struct hci_dev *hdev = conn->hdev;
193 struct hci_cp_read_clock_offset clkoff_cp;
194
195 clkoff_cp.handle = cpu_to_le16(conn->handle);
196 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
197 &clkoff_cp);
198 }
199
200 return hci_abort_conn(conn, reason);
201}
202
203static void hci_add_sco(struct hci_conn *conn, __u16 handle)
204{
205 struct hci_dev *hdev = conn->hdev;
206 struct hci_cp_add_sco cp;
207
208 BT_DBG("hcon %p", conn);
209
210 conn->state = BT_CONNECT;
211 conn->out = true;
212
213 conn->attempt++;
214
215 cp.handle = cpu_to_le16(handle);
216 cp.pkt_type = cpu_to_le16(conn->pkt_type);
217
218 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
219}
220
221static bool find_next_esco_param(struct hci_conn *conn,
222 const struct sco_param *esco_param, int size)
223{
224 if (!conn->parent)
225 return false;
226
227 for (; conn->attempt <= size; conn->attempt++) {
228 if (lmp_esco_2m_capable(conn->parent) ||
229 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
230 break;
231 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
232 conn, conn->attempt);
233 }
234
235 return conn->attempt <= size;
236}
237
238static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
239{
240 int err;
241 __u8 vnd_len, *vnd_data = NULL;
242 struct hci_op_configure_data_path *cmd = NULL;
243
244 if (!codec->data_path || !hdev->get_codec_config_data)
245 return 0;
246
247 /* Do not take me as error */
248 if (!hdev->get_codec_config_data)
249 return 0;
250
251 err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
252 &vnd_data);
253 if (err < 0)
254 goto error;
255
256 cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
257 if (!cmd) {
258 err = -ENOMEM;
259 goto error;
260 }
261
262 err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
263 if (err < 0)
264 goto error;
265
266 cmd->vnd_len = vnd_len;
267 memcpy(cmd->vnd_data, vnd_data, vnd_len);
268
269 cmd->direction = 0x00;
270 __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
271 sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
272
273 cmd->direction = 0x01;
274 err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
275 sizeof(*cmd) + vnd_len, cmd,
276 HCI_CMD_TIMEOUT);
277error:
278
279 kfree(cmd);
280 kfree(vnd_data);
281 return err;
282}
283
284static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
285{
286 struct conn_handle_t *conn_handle = data;
287 struct hci_conn *conn = conn_handle->conn;
288 __u16 handle = conn_handle->handle;
289 struct hci_cp_enhanced_setup_sync_conn cp;
290 const struct sco_param *param;
291
292 kfree(conn_handle);
293
294 bt_dev_dbg(hdev, "hcon %p", conn);
295
296 configure_datapath_sync(hdev, &conn->codec);
297
298 conn->state = BT_CONNECT;
299 conn->out = true;
300
301 conn->attempt++;
302
303 memset(&cp, 0x00, sizeof(cp));
304
305 cp.handle = cpu_to_le16(handle);
306
307 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
308 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
309
310 switch (conn->codec.id) {
311 case BT_CODEC_MSBC:
312 if (!find_next_esco_param(conn, esco_param_msbc,
313 ARRAY_SIZE(esco_param_msbc)))
314 return -EINVAL;
315
316 param = &esco_param_msbc[conn->attempt - 1];
317 cp.tx_coding_format.id = 0x05;
318 cp.rx_coding_format.id = 0x05;
319 cp.tx_codec_frame_size = __cpu_to_le16(60);
320 cp.rx_codec_frame_size = __cpu_to_le16(60);
321 cp.in_bandwidth = __cpu_to_le32(32000);
322 cp.out_bandwidth = __cpu_to_le32(32000);
323 cp.in_coding_format.id = 0x04;
324 cp.out_coding_format.id = 0x04;
325 cp.in_coded_data_size = __cpu_to_le16(16);
326 cp.out_coded_data_size = __cpu_to_le16(16);
327 cp.in_pcm_data_format = 2;
328 cp.out_pcm_data_format = 2;
329 cp.in_pcm_sample_payload_msb_pos = 0;
330 cp.out_pcm_sample_payload_msb_pos = 0;
331 cp.in_data_path = conn->codec.data_path;
332 cp.out_data_path = conn->codec.data_path;
333 cp.in_transport_unit_size = 1;
334 cp.out_transport_unit_size = 1;
335 break;
336
337 case BT_CODEC_TRANSPARENT:
338 if (!find_next_esco_param(conn, esco_param_msbc,
339 ARRAY_SIZE(esco_param_msbc)))
340 return false;
341 param = &esco_param_msbc[conn->attempt - 1];
342 cp.tx_coding_format.id = 0x03;
343 cp.rx_coding_format.id = 0x03;
344 cp.tx_codec_frame_size = __cpu_to_le16(60);
345 cp.rx_codec_frame_size = __cpu_to_le16(60);
346 cp.in_bandwidth = __cpu_to_le32(0x1f40);
347 cp.out_bandwidth = __cpu_to_le32(0x1f40);
348 cp.in_coding_format.id = 0x03;
349 cp.out_coding_format.id = 0x03;
350 cp.in_coded_data_size = __cpu_to_le16(16);
351 cp.out_coded_data_size = __cpu_to_le16(16);
352 cp.in_pcm_data_format = 2;
353 cp.out_pcm_data_format = 2;
354 cp.in_pcm_sample_payload_msb_pos = 0;
355 cp.out_pcm_sample_payload_msb_pos = 0;
356 cp.in_data_path = conn->codec.data_path;
357 cp.out_data_path = conn->codec.data_path;
358 cp.in_transport_unit_size = 1;
359 cp.out_transport_unit_size = 1;
360 break;
361
362 case BT_CODEC_CVSD:
363 if (conn->parent && lmp_esco_capable(conn->parent)) {
364 if (!find_next_esco_param(conn, esco_param_cvsd,
365 ARRAY_SIZE(esco_param_cvsd)))
366 return -EINVAL;
367 param = &esco_param_cvsd[conn->attempt - 1];
368 } else {
369 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
370 return -EINVAL;
371 param = &sco_param_cvsd[conn->attempt - 1];
372 }
373 cp.tx_coding_format.id = 2;
374 cp.rx_coding_format.id = 2;
375 cp.tx_codec_frame_size = __cpu_to_le16(60);
376 cp.rx_codec_frame_size = __cpu_to_le16(60);
377 cp.in_bandwidth = __cpu_to_le32(16000);
378 cp.out_bandwidth = __cpu_to_le32(16000);
379 cp.in_coding_format.id = 4;
380 cp.out_coding_format.id = 4;
381 cp.in_coded_data_size = __cpu_to_le16(16);
382 cp.out_coded_data_size = __cpu_to_le16(16);
383 cp.in_pcm_data_format = 2;
384 cp.out_pcm_data_format = 2;
385 cp.in_pcm_sample_payload_msb_pos = 0;
386 cp.out_pcm_sample_payload_msb_pos = 0;
387 cp.in_data_path = conn->codec.data_path;
388 cp.out_data_path = conn->codec.data_path;
389 cp.in_transport_unit_size = 16;
390 cp.out_transport_unit_size = 16;
391 break;
392 default:
393 return -EINVAL;
394 }
395
396 cp.retrans_effort = param->retrans_effort;
397 cp.pkt_type = __cpu_to_le16(param->pkt_type);
398 cp.max_latency = __cpu_to_le16(param->max_latency);
399
400 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
401 return -EIO;
402
403 return 0;
404}
405
406static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
407{
408 struct hci_dev *hdev = conn->hdev;
409 struct hci_cp_setup_sync_conn cp;
410 const struct sco_param *param;
411
412 bt_dev_dbg(hdev, "hcon %p", conn);
413
414 conn->state = BT_CONNECT;
415 conn->out = true;
416
417 conn->attempt++;
418
419 cp.handle = cpu_to_le16(handle);
420
421 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
422 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
423 cp.voice_setting = cpu_to_le16(conn->setting);
424
425 switch (conn->setting & SCO_AIRMODE_MASK) {
426 case SCO_AIRMODE_TRANSP:
427 if (!find_next_esco_param(conn, esco_param_msbc,
428 ARRAY_SIZE(esco_param_msbc)))
429 return false;
430 param = &esco_param_msbc[conn->attempt - 1];
431 break;
432 case SCO_AIRMODE_CVSD:
433 if (conn->parent && lmp_esco_capable(conn->parent)) {
434 if (!find_next_esco_param(conn, esco_param_cvsd,
435 ARRAY_SIZE(esco_param_cvsd)))
436 return false;
437 param = &esco_param_cvsd[conn->attempt - 1];
438 } else {
439 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
440 return false;
441 param = &sco_param_cvsd[conn->attempt - 1];
442 }
443 break;
444 default:
445 return false;
446 }
447
448 cp.retrans_effort = param->retrans_effort;
449 cp.pkt_type = __cpu_to_le16(param->pkt_type);
450 cp.max_latency = __cpu_to_le16(param->max_latency);
451
452 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
453 return false;
454
455 return true;
456}
457
458bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
459{
460 int result;
461 struct conn_handle_t *conn_handle;
462
463 if (enhanced_sync_conn_capable(conn->hdev)) {
464 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
465
466 if (!conn_handle)
467 return false;
468
469 conn_handle->conn = conn;
470 conn_handle->handle = handle;
471 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
472 conn_handle, NULL);
473 if (result < 0)
474 kfree(conn_handle);
475
476 return result == 0;
477 }
478
479 return hci_setup_sync_conn(conn, handle);
480}
481
482u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
483 u16 to_multiplier)
484{
485 struct hci_dev *hdev = conn->hdev;
486 struct hci_conn_params *params;
487 struct hci_cp_le_conn_update cp;
488
489 hci_dev_lock(hdev);
490
491 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
492 if (params) {
493 params->conn_min_interval = min;
494 params->conn_max_interval = max;
495 params->conn_latency = latency;
496 params->supervision_timeout = to_multiplier;
497 }
498
499 hci_dev_unlock(hdev);
500
501 memset(&cp, 0, sizeof(cp));
502 cp.handle = cpu_to_le16(conn->handle);
503 cp.conn_interval_min = cpu_to_le16(min);
504 cp.conn_interval_max = cpu_to_le16(max);
505 cp.conn_latency = cpu_to_le16(latency);
506 cp.supervision_timeout = cpu_to_le16(to_multiplier);
507 cp.min_ce_len = cpu_to_le16(0x0000);
508 cp.max_ce_len = cpu_to_le16(0x0000);
509
510 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
511
512 if (params)
513 return 0x01;
514
515 return 0x00;
516}
517
518void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
519 __u8 ltk[16], __u8 key_size)
520{
521 struct hci_dev *hdev = conn->hdev;
522 struct hci_cp_le_start_enc cp;
523
524 BT_DBG("hcon %p", conn);
525
526 memset(&cp, 0, sizeof(cp));
527
528 cp.handle = cpu_to_le16(conn->handle);
529 cp.rand = rand;
530 cp.ediv = ediv;
531 memcpy(cp.ltk, ltk, key_size);
532
533 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
534}
535
536/* Device _must_ be locked */
537void hci_sco_setup(struct hci_conn *conn, __u8 status)
538{
539 struct hci_link *link;
540
541 link = list_first_entry_or_null(&conn->link_list, struct hci_link, list);
542 if (!link || !link->conn)
543 return;
544
545 BT_DBG("hcon %p", conn);
546
547 if (!status) {
548 if (lmp_esco_capable(conn->hdev))
549 hci_setup_sync(link->conn, conn->handle);
550 else
551 hci_add_sco(link->conn, conn->handle);
552 } else {
553 hci_connect_cfm(link->conn, status);
554 hci_conn_del(link->conn);
555 }
556}
557
558static void hci_conn_timeout(struct work_struct *work)
559{
560 struct hci_conn *conn = container_of(work, struct hci_conn,
561 disc_work.work);
562 int refcnt = atomic_read(&conn->refcnt);
563
564 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
565
566 WARN_ON(refcnt < 0);
567
568 /* FIXME: It was observed that in pairing failed scenario, refcnt
569 * drops below 0. Probably this is because l2cap_conn_del calls
570 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
571 * dropped. After that loop hci_chan_del is called which also drops
572 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
573 * otherwise drop it.
574 */
575 if (refcnt > 0)
576 return;
577
578 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
579}
580
581/* Enter sniff mode */
582static void hci_conn_idle(struct work_struct *work)
583{
584 struct hci_conn *conn = container_of(work, struct hci_conn,
585 idle_work.work);
586 struct hci_dev *hdev = conn->hdev;
587
588 BT_DBG("hcon %p mode %d", conn, conn->mode);
589
590 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
591 return;
592
593 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
594 return;
595
596 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
597 struct hci_cp_sniff_subrate cp;
598 cp.handle = cpu_to_le16(conn->handle);
599 cp.max_latency = cpu_to_le16(0);
600 cp.min_remote_timeout = cpu_to_le16(0);
601 cp.min_local_timeout = cpu_to_le16(0);
602 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
603 }
604
605 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
606 struct hci_cp_sniff_mode cp;
607 cp.handle = cpu_to_le16(conn->handle);
608 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
609 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
610 cp.attempt = cpu_to_le16(4);
611 cp.timeout = cpu_to_le16(1);
612 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
613 }
614}
615
616static void hci_conn_auto_accept(struct work_struct *work)
617{
618 struct hci_conn *conn = container_of(work, struct hci_conn,
619 auto_accept_work.work);
620
621 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
622 &conn->dst);
623}
624
625static void le_disable_advertising(struct hci_dev *hdev)
626{
627 if (ext_adv_capable(hdev)) {
628 struct hci_cp_le_set_ext_adv_enable cp;
629
630 cp.enable = 0x00;
631 cp.num_of_sets = 0x00;
632
633 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
634 &cp);
635 } else {
636 u8 enable = 0x00;
637 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
638 &enable);
639 }
640}
641
642static void le_conn_timeout(struct work_struct *work)
643{
644 struct hci_conn *conn = container_of(work, struct hci_conn,
645 le_conn_timeout.work);
646 struct hci_dev *hdev = conn->hdev;
647
648 BT_DBG("");
649
650 /* We could end up here due to having done directed advertising,
651 * so clean up the state if necessary. This should however only
652 * happen with broken hardware or if low duty cycle was used
653 * (which doesn't have a timeout of its own).
654 */
655 if (conn->role == HCI_ROLE_SLAVE) {
656 /* Disable LE Advertising */
657 le_disable_advertising(hdev);
658 hci_dev_lock(hdev);
659 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
660 hci_dev_unlock(hdev);
661 return;
662 }
663
664 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
665}
666
667struct iso_cig_params {
668 struct hci_cp_le_set_cig_params cp;
669 struct hci_cis_params cis[0x1f];
670};
671
672struct iso_list_data {
673 union {
674 u8 cig;
675 u8 big;
676 };
677 union {
678 u8 cis;
679 u8 bis;
680 u16 sync_handle;
681 };
682 int count;
683 bool big_term;
684 bool pa_sync_term;
685 bool big_sync_term;
686};
687
688static void bis_list(struct hci_conn *conn, void *data)
689{
690 struct iso_list_data *d = data;
691
692 /* Skip if not broadcast/ANY address */
693 if (bacmp(&conn->dst, BDADDR_ANY))
694 return;
695
696 if (d->big != conn->iso_qos.bcast.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
697 d->bis != conn->iso_qos.bcast.bis)
698 return;
699
700 d->count++;
701}
702
703static int terminate_big_sync(struct hci_dev *hdev, void *data)
704{
705 struct iso_list_data *d = data;
706
707 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
708
709 hci_disable_per_advertising_sync(hdev, d->bis);
710 hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
711
712 /* Only terminate BIG if it has been created */
713 if (!d->big_term)
714 return 0;
715
716 return hci_le_terminate_big_sync(hdev, d->big,
717 HCI_ERROR_LOCAL_HOST_TERM);
718}
719
720static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
721{
722 kfree(data);
723}
724
725static int hci_le_terminate_big(struct hci_dev *hdev, struct hci_conn *conn)
726{
727 struct iso_list_data *d;
728 int ret;
729
730 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", conn->iso_qos.bcast.big,
731 conn->iso_qos.bcast.bis);
732
733 d = kzalloc(sizeof(*d), GFP_KERNEL);
734 if (!d)
735 return -ENOMEM;
736
737 d->big = conn->iso_qos.bcast.big;
738 d->bis = conn->iso_qos.bcast.bis;
739 d->big_term = test_and_clear_bit(HCI_CONN_BIG_CREATED, &conn->flags);
740
741 ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
742 terminate_big_destroy);
743 if (ret)
744 kfree(d);
745
746 return ret;
747}
748
749static int big_terminate_sync(struct hci_dev *hdev, void *data)
750{
751 struct iso_list_data *d = data;
752
753 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
754 d->sync_handle);
755
756 if (d->big_sync_term)
757 hci_le_big_terminate_sync(hdev, d->big);
758
759 if (d->pa_sync_term)
760 return hci_le_pa_terminate_sync(hdev, d->sync_handle);
761
762 return 0;
763}
764
765static void find_bis(struct hci_conn *conn, void *data)
766{
767 struct iso_list_data *d = data;
768
769 /* Ignore if BIG doesn't match */
770 if (d->big != conn->iso_qos.bcast.big)
771 return;
772
773 d->count++;
774}
775
776static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, struct hci_conn *conn)
777{
778 struct iso_list_data *d;
779 int ret;
780
781 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, conn->sync_handle);
782
783 d = kzalloc(sizeof(*d), GFP_KERNEL);
784 if (!d)
785 return -ENOMEM;
786
787 memset(d, 0, sizeof(*d));
788 d->big = big;
789 d->sync_handle = conn->sync_handle;
790
791 if (test_and_clear_bit(HCI_CONN_PA_SYNC, &conn->flags)) {
792 hci_conn_hash_list_flag(hdev, find_bis, ISO_LINK,
793 HCI_CONN_PA_SYNC, d);
794
795 if (!d->count)
796 d->pa_sync_term = true;
797
798 d->count = 0;
799 }
800
801 if (test_and_clear_bit(HCI_CONN_BIG_SYNC, &conn->flags)) {
802 hci_conn_hash_list_flag(hdev, find_bis, ISO_LINK,
803 HCI_CONN_BIG_SYNC, d);
804
805 if (!d->count)
806 d->big_sync_term = true;
807 }
808
809 ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
810 terminate_big_destroy);
811 if (ret)
812 kfree(d);
813
814 return ret;
815}
816
817/* Cleanup BIS connection
818 *
819 * Detects if there any BIS left connected in a BIG
820 * broadcaster: Remove advertising instance and terminate BIG.
821 * broadcaster receiver: Teminate BIG sync and terminate PA sync.
822 */
823static void bis_cleanup(struct hci_conn *conn)
824{
825 struct hci_dev *hdev = conn->hdev;
826 struct hci_conn *bis;
827
828 bt_dev_dbg(hdev, "conn %p", conn);
829
830 if (conn->role == HCI_ROLE_MASTER) {
831 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
832 return;
833
834 /* Check if ISO connection is a BIS and terminate advertising
835 * set and BIG if there are no other connections using it.
836 */
837 bis = hci_conn_hash_lookup_big(hdev, conn->iso_qos.bcast.big);
838 if (bis)
839 return;
840
841 hci_le_terminate_big(hdev, conn);
842 } else {
843 hci_le_big_terminate(hdev, conn->iso_qos.bcast.big,
844 conn);
845 }
846}
847
848static int remove_cig_sync(struct hci_dev *hdev, void *data)
849{
850 u8 handle = PTR_UINT(data);
851
852 return hci_le_remove_cig_sync(hdev, handle);
853}
854
855static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
856{
857 bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
858
859 return hci_cmd_sync_queue(hdev, remove_cig_sync, UINT_PTR(handle),
860 NULL);
861}
862
863static void find_cis(struct hci_conn *conn, void *data)
864{
865 struct iso_list_data *d = data;
866
867 /* Ignore broadcast or if CIG don't match */
868 if (!bacmp(&conn->dst, BDADDR_ANY) || d->cig != conn->iso_qos.ucast.cig)
869 return;
870
871 d->count++;
872}
873
874/* Cleanup CIS connection:
875 *
876 * Detects if there any CIS left connected in a CIG and remove it.
877 */
878static void cis_cleanup(struct hci_conn *conn)
879{
880 struct hci_dev *hdev = conn->hdev;
881 struct iso_list_data d;
882
883 if (conn->iso_qos.ucast.cig == BT_ISO_QOS_CIG_UNSET)
884 return;
885
886 memset(&d, 0, sizeof(d));
887 d.cig = conn->iso_qos.ucast.cig;
888
889 /* Check if ISO connection is a CIS and remove CIG if there are
890 * no other connections using it.
891 */
892 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_BOUND, &d);
893 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECT, &d);
894 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECTED, &d);
895 if (d.count)
896 return;
897
898 hci_le_remove_cig(hdev, conn->iso_qos.ucast.cig);
899}
900
901static int hci_conn_hash_alloc_unset(struct hci_dev *hdev)
902{
903 return ida_alloc_range(&hdev->unset_handle_ida, HCI_CONN_HANDLE_MAX + 1,
904 U16_MAX, GFP_ATOMIC);
905}
906
907struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
908 u8 role, u16 handle)
909{
910 struct hci_conn *conn;
911
912 switch (type) {
913 case ACL_LINK:
914 if (!hdev->acl_mtu)
915 return ERR_PTR(-ECONNREFUSED);
916 break;
917 case ISO_LINK:
918 if (hdev->iso_mtu)
919 /* Dedicated ISO Buffer exists */
920 break;
921 fallthrough;
922 case LE_LINK:
923 if (hdev->le_mtu && hdev->le_mtu < HCI_MIN_LE_MTU)
924 return ERR_PTR(-ECONNREFUSED);
925 if (!hdev->le_mtu && hdev->acl_mtu < HCI_MIN_LE_MTU)
926 return ERR_PTR(-ECONNREFUSED);
927 break;
928 case SCO_LINK:
929 case ESCO_LINK:
930 if (!hdev->sco_pkts)
931 /* Controller does not support SCO or eSCO over HCI */
932 return ERR_PTR(-ECONNREFUSED);
933 break;
934 default:
935 return ERR_PTR(-ECONNREFUSED);
936 }
937
938 bt_dev_dbg(hdev, "dst %pMR handle 0x%4.4x", dst, handle);
939
940 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
941 if (!conn)
942 return ERR_PTR(-ENOMEM);
943
944 bacpy(&conn->dst, dst);
945 bacpy(&conn->src, &hdev->bdaddr);
946 conn->handle = handle;
947 conn->hdev = hdev;
948 conn->type = type;
949 conn->role = role;
950 conn->mode = HCI_CM_ACTIVE;
951 conn->state = BT_OPEN;
952 conn->auth_type = HCI_AT_GENERAL_BONDING;
953 conn->io_capability = hdev->io_capability;
954 conn->remote_auth = 0xff;
955 conn->key_type = 0xff;
956 conn->rssi = HCI_RSSI_INVALID;
957 conn->tx_power = HCI_TX_POWER_INVALID;
958 conn->max_tx_power = HCI_TX_POWER_INVALID;
959 conn->sync_handle = HCI_SYNC_HANDLE_INVALID;
960
961 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
962 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
963
964 /* Set Default Authenticated payload timeout to 30s */
965 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
966
967 if (conn->role == HCI_ROLE_MASTER)
968 conn->out = true;
969
970 switch (type) {
971 case ACL_LINK:
972 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
973 conn->mtu = hdev->acl_mtu;
974 break;
975 case LE_LINK:
976 /* conn->src should reflect the local identity address */
977 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
978 conn->mtu = hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
979 break;
980 case ISO_LINK:
981 /* conn->src should reflect the local identity address */
982 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
983
984 /* set proper cleanup function */
985 if (!bacmp(dst, BDADDR_ANY))
986 conn->cleanup = bis_cleanup;
987 else if (conn->role == HCI_ROLE_MASTER)
988 conn->cleanup = cis_cleanup;
989
990 conn->mtu = hdev->iso_mtu ? hdev->iso_mtu :
991 hdev->le_mtu ? hdev->le_mtu : hdev->acl_mtu;
992 break;
993 case SCO_LINK:
994 if (lmp_esco_capable(hdev))
995 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
996 (hdev->esco_type & EDR_ESCO_MASK);
997 else
998 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
999
1000 conn->mtu = hdev->sco_mtu;
1001 break;
1002 case ESCO_LINK:
1003 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1004 conn->mtu = hdev->sco_mtu;
1005 break;
1006 }
1007
1008 skb_queue_head_init(&conn->data_q);
1009
1010 INIT_LIST_HEAD(&conn->chan_list);
1011 INIT_LIST_HEAD(&conn->link_list);
1012
1013 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1014 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1015 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1016 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1017
1018 atomic_set(&conn->refcnt, 0);
1019
1020 hci_dev_hold(hdev);
1021
1022 hci_conn_hash_add(hdev, conn);
1023
1024 /* The SCO and eSCO connections will only be notified when their
1025 * setup has been completed. This is different to ACL links which
1026 * can be notified right away.
1027 */
1028 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1029 if (hdev->notify)
1030 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1031 }
1032
1033 hci_conn_init_sysfs(conn);
1034
1035 return conn;
1036}
1037
1038struct hci_conn *hci_conn_add_unset(struct hci_dev *hdev, int type,
1039 bdaddr_t *dst, u8 role)
1040{
1041 int handle;
1042
1043 bt_dev_dbg(hdev, "dst %pMR", dst);
1044
1045 handle = hci_conn_hash_alloc_unset(hdev);
1046 if (unlikely(handle < 0))
1047 return ERR_PTR(-ECONNREFUSED);
1048
1049 return hci_conn_add(hdev, type, dst, role, handle);
1050}
1051
1052static void hci_conn_cleanup_child(struct hci_conn *conn, u8 reason)
1053{
1054 if (!reason)
1055 reason = HCI_ERROR_REMOTE_USER_TERM;
1056
1057 /* Due to race, SCO/ISO conn might be not established yet at this point,
1058 * and nothing else will clean it up. In other cases it is done via HCI
1059 * events.
1060 */
1061 switch (conn->type) {
1062 case SCO_LINK:
1063 case ESCO_LINK:
1064 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1065 hci_conn_failed(conn, reason);
1066 break;
1067 case ISO_LINK:
1068 if ((conn->state != BT_CONNECTED &&
1069 !test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) ||
1070 test_bit(HCI_CONN_BIG_CREATED, &conn->flags))
1071 hci_conn_failed(conn, reason);
1072 break;
1073 }
1074}
1075
1076static void hci_conn_unlink(struct hci_conn *conn)
1077{
1078 struct hci_dev *hdev = conn->hdev;
1079
1080 bt_dev_dbg(hdev, "hcon %p", conn);
1081
1082 if (!conn->parent) {
1083 struct hci_link *link, *t;
1084
1085 list_for_each_entry_safe(link, t, &conn->link_list, list) {
1086 struct hci_conn *child = link->conn;
1087
1088 hci_conn_unlink(child);
1089
1090 /* If hdev is down it means
1091 * hci_dev_close_sync/hci_conn_hash_flush is in progress
1092 * and links don't need to be cleanup as all connections
1093 * would be cleanup.
1094 */
1095 if (!test_bit(HCI_UP, &hdev->flags))
1096 continue;
1097
1098 hci_conn_cleanup_child(child, conn->abort_reason);
1099 }
1100
1101 return;
1102 }
1103
1104 if (!conn->link)
1105 return;
1106
1107 list_del_rcu(&conn->link->list);
1108 synchronize_rcu();
1109
1110 hci_conn_drop(conn->parent);
1111 hci_conn_put(conn->parent);
1112 conn->parent = NULL;
1113
1114 kfree(conn->link);
1115 conn->link = NULL;
1116}
1117
1118void hci_conn_del(struct hci_conn *conn)
1119{
1120 struct hci_dev *hdev = conn->hdev;
1121
1122 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1123
1124 hci_conn_unlink(conn);
1125
1126 cancel_delayed_work_sync(&conn->disc_work);
1127 cancel_delayed_work_sync(&conn->auto_accept_work);
1128 cancel_delayed_work_sync(&conn->idle_work);
1129
1130 if (conn->type == ACL_LINK) {
1131 /* Unacked frames */
1132 hdev->acl_cnt += conn->sent;
1133 } else if (conn->type == LE_LINK) {
1134 cancel_delayed_work(&conn->le_conn_timeout);
1135
1136 if (hdev->le_pkts)
1137 hdev->le_cnt += conn->sent;
1138 else
1139 hdev->acl_cnt += conn->sent;
1140 } else {
1141 /* Unacked ISO frames */
1142 if (conn->type == ISO_LINK) {
1143 if (hdev->iso_pkts)
1144 hdev->iso_cnt += conn->sent;
1145 else if (hdev->le_pkts)
1146 hdev->le_cnt += conn->sent;
1147 else
1148 hdev->acl_cnt += conn->sent;
1149 }
1150 }
1151
1152 skb_queue_purge(&conn->data_q);
1153
1154 /* Remove the connection from the list and cleanup its remaining
1155 * state. This is a separate function since for some cases like
1156 * BT_CONNECT_SCAN we *only* want the cleanup part without the
1157 * rest of hci_conn_del.
1158 */
1159 hci_conn_cleanup(conn);
1160
1161 /* Dequeue callbacks using connection pointer as data */
1162 hci_cmd_sync_dequeue(hdev, NULL, conn, NULL);
1163}
1164
1165struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1166{
1167 int use_src = bacmp(src, BDADDR_ANY);
1168 struct hci_dev *hdev = NULL, *d;
1169
1170 BT_DBG("%pMR -> %pMR", src, dst);
1171
1172 read_lock(&hci_dev_list_lock);
1173
1174 list_for_each_entry(d, &hci_dev_list, list) {
1175 if (!test_bit(HCI_UP, &d->flags) ||
1176 hci_dev_test_flag(d, HCI_USER_CHANNEL))
1177 continue;
1178
1179 /* Simple routing:
1180 * No source address - find interface with bdaddr != dst
1181 * Source address - find interface with bdaddr == src
1182 */
1183
1184 if (use_src) {
1185 bdaddr_t id_addr;
1186 u8 id_addr_type;
1187
1188 if (src_type == BDADDR_BREDR) {
1189 if (!lmp_bredr_capable(d))
1190 continue;
1191 bacpy(&id_addr, &d->bdaddr);
1192 id_addr_type = BDADDR_BREDR;
1193 } else {
1194 if (!lmp_le_capable(d))
1195 continue;
1196
1197 hci_copy_identity_address(d, &id_addr,
1198 &id_addr_type);
1199
1200 /* Convert from HCI to three-value type */
1201 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1202 id_addr_type = BDADDR_LE_PUBLIC;
1203 else
1204 id_addr_type = BDADDR_LE_RANDOM;
1205 }
1206
1207 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
1208 hdev = d; break;
1209 }
1210 } else {
1211 if (bacmp(&d->bdaddr, dst)) {
1212 hdev = d; break;
1213 }
1214 }
1215 }
1216
1217 if (hdev)
1218 hdev = hci_dev_hold(hdev);
1219
1220 read_unlock(&hci_dev_list_lock);
1221 return hdev;
1222}
1223EXPORT_SYMBOL(hci_get_route);
1224
1225/* This function requires the caller holds hdev->lock */
1226static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1227{
1228 struct hci_dev *hdev = conn->hdev;
1229
1230 hci_connect_le_scan_cleanup(conn, status);
1231
1232 /* Enable advertising in case this was a failed connection
1233 * attempt as a peripheral.
1234 */
1235 hci_enable_advertising(hdev);
1236}
1237
1238/* This function requires the caller holds hdev->lock */
1239void hci_conn_failed(struct hci_conn *conn, u8 status)
1240{
1241 struct hci_dev *hdev = conn->hdev;
1242
1243 bt_dev_dbg(hdev, "status 0x%2.2x", status);
1244
1245 switch (conn->type) {
1246 case LE_LINK:
1247 hci_le_conn_failed(conn, status);
1248 break;
1249 case ACL_LINK:
1250 mgmt_connect_failed(hdev, &conn->dst, conn->type,
1251 conn->dst_type, status);
1252 break;
1253 }
1254
1255 /* In case of BIG/PA sync failed, clear conn flags so that
1256 * the conns will be correctly cleaned up by ISO layer
1257 */
1258 test_and_clear_bit(HCI_CONN_BIG_SYNC_FAILED, &conn->flags);
1259 test_and_clear_bit(HCI_CONN_PA_SYNC_FAILED, &conn->flags);
1260
1261 conn->state = BT_CLOSED;
1262 hci_connect_cfm(conn, status);
1263 hci_conn_del(conn);
1264}
1265
1266/* This function requires the caller holds hdev->lock */
1267u8 hci_conn_set_handle(struct hci_conn *conn, u16 handle)
1268{
1269 struct hci_dev *hdev = conn->hdev;
1270
1271 bt_dev_dbg(hdev, "hcon %p handle 0x%4.4x", conn, handle);
1272
1273 if (conn->handle == handle)
1274 return 0;
1275
1276 if (handle > HCI_CONN_HANDLE_MAX) {
1277 bt_dev_err(hdev, "Invalid handle: 0x%4.4x > 0x%4.4x",
1278 handle, HCI_CONN_HANDLE_MAX);
1279 return HCI_ERROR_INVALID_PARAMETERS;
1280 }
1281
1282 /* If abort_reason has been sent it means the connection is being
1283 * aborted and the handle shall not be changed.
1284 */
1285 if (conn->abort_reason)
1286 return conn->abort_reason;
1287
1288 if (HCI_CONN_HANDLE_UNSET(conn->handle))
1289 ida_free(&hdev->unset_handle_ida, conn->handle);
1290
1291 conn->handle = handle;
1292
1293 return 0;
1294}
1295
1296struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1297 u8 dst_type, bool dst_resolved, u8 sec_level,
1298 u16 conn_timeout, u8 role, u8 phy, u8 sec_phy)
1299{
1300 struct hci_conn *conn;
1301 struct smp_irk *irk;
1302 int err;
1303
1304 /* Let's make sure that le is enabled.*/
1305 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1306 if (lmp_le_capable(hdev))
1307 return ERR_PTR(-ECONNREFUSED);
1308
1309 return ERR_PTR(-EOPNOTSUPP);
1310 }
1311
1312 /* Since the controller supports only one LE connection attempt at a
1313 * time, we return -EBUSY if there is any connection attempt running.
1314 */
1315 if (hci_lookup_le_connect(hdev))
1316 return ERR_PTR(-EBUSY);
1317
1318 /* If there's already a connection object but it's not in
1319 * scanning state it means it must already be established, in
1320 * which case we can't do anything else except report a failure
1321 * to connect.
1322 */
1323 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1324 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1325 return ERR_PTR(-EBUSY);
1326 }
1327
1328 /* Check if the destination address has been resolved by the controller
1329 * since if it did then the identity address shall be used.
1330 */
1331 if (!dst_resolved) {
1332 /* When given an identity address with existing identity
1333 * resolving key, the connection needs to be established
1334 * to a resolvable random address.
1335 *
1336 * Storing the resolvable random address is required here
1337 * to handle connection failures. The address will later
1338 * be resolved back into the original identity address
1339 * from the connect request.
1340 */
1341 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1342 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1343 dst = &irk->rpa;
1344 dst_type = ADDR_LE_DEV_RANDOM;
1345 }
1346 }
1347
1348 if (conn) {
1349 bacpy(&conn->dst, dst);
1350 } else {
1351 conn = hci_conn_add_unset(hdev, LE_LINK, dst, role);
1352 if (IS_ERR(conn))
1353 return conn;
1354 hci_conn_hold(conn);
1355 conn->pending_sec_level = sec_level;
1356 }
1357
1358 conn->dst_type = dst_type;
1359 conn->sec_level = BT_SECURITY_LOW;
1360 conn->conn_timeout = conn_timeout;
1361 conn->le_adv_phy = phy;
1362 conn->le_adv_sec_phy = sec_phy;
1363
1364 err = hci_connect_le_sync(hdev, conn);
1365 if (err) {
1366 hci_conn_del(conn);
1367 return ERR_PTR(err);
1368 }
1369
1370 return conn;
1371}
1372
1373static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1374{
1375 struct hci_conn *conn;
1376
1377 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1378 if (!conn)
1379 return false;
1380
1381 if (conn->state != BT_CONNECTED)
1382 return false;
1383
1384 return true;
1385}
1386
1387/* This function requires the caller holds hdev->lock */
1388static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1389 bdaddr_t *addr, u8 addr_type)
1390{
1391 struct hci_conn_params *params;
1392
1393 if (is_connected(hdev, addr, addr_type))
1394 return -EISCONN;
1395
1396 params = hci_conn_params_lookup(hdev, addr, addr_type);
1397 if (!params) {
1398 params = hci_conn_params_add(hdev, addr, addr_type);
1399 if (!params)
1400 return -ENOMEM;
1401
1402 /* If we created new params, mark them to be deleted in
1403 * hci_connect_le_scan_cleanup. It's different case than
1404 * existing disabled params, those will stay after cleanup.
1405 */
1406 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1407 }
1408
1409 /* We're trying to connect, so make sure params are at pend_le_conns */
1410 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1411 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1412 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1413 hci_pend_le_list_del_init(params);
1414 hci_pend_le_list_add(params, &hdev->pend_le_conns);
1415 }
1416
1417 params->explicit_connect = true;
1418
1419 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1420 params->auto_connect);
1421
1422 return 0;
1423}
1424
1425static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1426{
1427 struct hci_conn *conn;
1428 u8 big;
1429
1430 /* Allocate a BIG if not set */
1431 if (qos->bcast.big == BT_ISO_QOS_BIG_UNSET) {
1432 for (big = 0x00; big < 0xef; big++) {
1433
1434 conn = hci_conn_hash_lookup_big(hdev, big);
1435 if (!conn)
1436 break;
1437 }
1438
1439 if (big == 0xef)
1440 return -EADDRNOTAVAIL;
1441
1442 /* Update BIG */
1443 qos->bcast.big = big;
1444 }
1445
1446 return 0;
1447}
1448
1449static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1450{
1451 struct hci_conn *conn;
1452 u8 bis;
1453
1454 /* Allocate BIS if not set */
1455 if (qos->bcast.bis == BT_ISO_QOS_BIS_UNSET) {
1456 if (qos->bcast.big != BT_ISO_QOS_BIG_UNSET) {
1457 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1458
1459 if (conn) {
1460 /* If the BIG handle is already matched to an advertising
1461 * handle, do not allocate a new one.
1462 */
1463 qos->bcast.bis = conn->iso_qos.bcast.bis;
1464 return 0;
1465 }
1466 }
1467
1468 /* Find an unused adv set to advertise BIS, skip instance 0x00
1469 * since it is reserved as general purpose set.
1470 */
1471 for (bis = 0x01; bis < hdev->le_num_of_adv_sets;
1472 bis++) {
1473
1474 conn = hci_conn_hash_lookup_bis(hdev, BDADDR_ANY, bis);
1475 if (!conn)
1476 break;
1477 }
1478
1479 if (bis == hdev->le_num_of_adv_sets)
1480 return -EADDRNOTAVAIL;
1481
1482 /* Update BIS */
1483 qos->bcast.bis = bis;
1484 }
1485
1486 return 0;
1487}
1488
1489/* This function requires the caller holds hdev->lock */
1490static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1491 struct bt_iso_qos *qos, __u8 base_len,
1492 __u8 *base)
1493{
1494 struct hci_conn *conn;
1495 int err;
1496
1497 /* Let's make sure that le is enabled.*/
1498 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1499 if (lmp_le_capable(hdev))
1500 return ERR_PTR(-ECONNREFUSED);
1501 return ERR_PTR(-EOPNOTSUPP);
1502 }
1503
1504 err = qos_set_big(hdev, qos);
1505 if (err)
1506 return ERR_PTR(err);
1507
1508 err = qos_set_bis(hdev, qos);
1509 if (err)
1510 return ERR_PTR(err);
1511
1512 /* Check if the LE Create BIG command has already been sent */
1513 conn = hci_conn_hash_lookup_per_adv_bis(hdev, dst, qos->bcast.big,
1514 qos->bcast.big);
1515 if (conn)
1516 return ERR_PTR(-EADDRINUSE);
1517
1518 /* Check BIS settings against other bound BISes, since all
1519 * BISes in a BIG must have the same value for all parameters
1520 */
1521 conn = hci_conn_hash_lookup_big(hdev, qos->bcast.big);
1522
1523 if (conn && (memcmp(qos, &conn->iso_qos, sizeof(*qos)) ||
1524 base_len != conn->le_per_adv_data_len ||
1525 memcmp(conn->le_per_adv_data, base, base_len)))
1526 return ERR_PTR(-EADDRINUSE);
1527
1528 conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1529 if (IS_ERR(conn))
1530 return conn;
1531
1532 conn->state = BT_CONNECT;
1533
1534 hci_conn_hold(conn);
1535 return conn;
1536}
1537
1538/* This function requires the caller holds hdev->lock */
1539struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1540 u8 dst_type, u8 sec_level,
1541 u16 conn_timeout,
1542 enum conn_reasons conn_reason)
1543{
1544 struct hci_conn *conn;
1545
1546 /* Let's make sure that le is enabled.*/
1547 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1548 if (lmp_le_capable(hdev))
1549 return ERR_PTR(-ECONNREFUSED);
1550
1551 return ERR_PTR(-EOPNOTSUPP);
1552 }
1553
1554 /* Some devices send ATT messages as soon as the physical link is
1555 * established. To be able to handle these ATT messages, the user-
1556 * space first establishes the connection and then starts the pairing
1557 * process.
1558 *
1559 * So if a hci_conn object already exists for the following connection
1560 * attempt, we simply update pending_sec_level and auth_type fields
1561 * and return the object found.
1562 */
1563 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1564 if (conn) {
1565 if (conn->pending_sec_level < sec_level)
1566 conn->pending_sec_level = sec_level;
1567 goto done;
1568 }
1569
1570 BT_DBG("requesting refresh of dst_addr");
1571
1572 conn = hci_conn_add_unset(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1573 if (IS_ERR(conn))
1574 return conn;
1575
1576 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1577 hci_conn_del(conn);
1578 return ERR_PTR(-EBUSY);
1579 }
1580
1581 conn->state = BT_CONNECT;
1582 set_bit(HCI_CONN_SCANNING, &conn->flags);
1583 conn->dst_type = dst_type;
1584 conn->sec_level = BT_SECURITY_LOW;
1585 conn->pending_sec_level = sec_level;
1586 conn->conn_timeout = conn_timeout;
1587 conn->conn_reason = conn_reason;
1588
1589 hci_update_passive_scan(hdev);
1590
1591done:
1592 hci_conn_hold(conn);
1593 return conn;
1594}
1595
1596struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1597 u8 sec_level, u8 auth_type,
1598 enum conn_reasons conn_reason, u16 timeout)
1599{
1600 struct hci_conn *acl;
1601
1602 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1603 if (lmp_bredr_capable(hdev))
1604 return ERR_PTR(-ECONNREFUSED);
1605
1606 return ERR_PTR(-EOPNOTSUPP);
1607 }
1608
1609 /* Reject outgoing connection to device with same BD ADDR against
1610 * CVE-2020-26555
1611 */
1612 if (!bacmp(&hdev->bdaddr, dst)) {
1613 bt_dev_dbg(hdev, "Reject connection with same BD_ADDR %pMR\n",
1614 dst);
1615 return ERR_PTR(-ECONNREFUSED);
1616 }
1617
1618 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1619 if (!acl) {
1620 acl = hci_conn_add_unset(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1621 if (IS_ERR(acl))
1622 return acl;
1623 }
1624
1625 hci_conn_hold(acl);
1626
1627 acl->conn_reason = conn_reason;
1628 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1629 int err;
1630
1631 acl->sec_level = BT_SECURITY_LOW;
1632 acl->pending_sec_level = sec_level;
1633 acl->auth_type = auth_type;
1634 acl->conn_timeout = timeout;
1635
1636 err = hci_connect_acl_sync(hdev, acl);
1637 if (err) {
1638 hci_conn_del(acl);
1639 return ERR_PTR(err);
1640 }
1641 }
1642
1643 return acl;
1644}
1645
1646static struct hci_link *hci_conn_link(struct hci_conn *parent,
1647 struct hci_conn *conn)
1648{
1649 struct hci_dev *hdev = parent->hdev;
1650 struct hci_link *link;
1651
1652 bt_dev_dbg(hdev, "parent %p hcon %p", parent, conn);
1653
1654 if (conn->link)
1655 return conn->link;
1656
1657 if (conn->parent)
1658 return NULL;
1659
1660 link = kzalloc(sizeof(*link), GFP_KERNEL);
1661 if (!link)
1662 return NULL;
1663
1664 link->conn = hci_conn_hold(conn);
1665 conn->link = link;
1666 conn->parent = hci_conn_get(parent);
1667
1668 /* Use list_add_tail_rcu append to the list */
1669 list_add_tail_rcu(&link->list, &parent->link_list);
1670
1671 return link;
1672}
1673
1674struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1675 __u16 setting, struct bt_codec *codec,
1676 u16 timeout)
1677{
1678 struct hci_conn *acl;
1679 struct hci_conn *sco;
1680 struct hci_link *link;
1681
1682 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1683 CONN_REASON_SCO_CONNECT, timeout);
1684 if (IS_ERR(acl))
1685 return acl;
1686
1687 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1688 if (!sco) {
1689 sco = hci_conn_add_unset(hdev, type, dst, HCI_ROLE_MASTER);
1690 if (IS_ERR(sco)) {
1691 hci_conn_drop(acl);
1692 return sco;
1693 }
1694 }
1695
1696 link = hci_conn_link(acl, sco);
1697 if (!link) {
1698 hci_conn_drop(acl);
1699 hci_conn_drop(sco);
1700 return ERR_PTR(-ENOLINK);
1701 }
1702
1703 sco->setting = setting;
1704 sco->codec = *codec;
1705
1706 if (acl->state == BT_CONNECTED &&
1707 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1708 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1709 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1710
1711 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1712 /* defer SCO setup until mode change completed */
1713 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1714 return sco;
1715 }
1716
1717 hci_sco_setup(acl, 0x00);
1718 }
1719
1720 return sco;
1721}
1722
1723static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1724{
1725 struct hci_dev *hdev = conn->hdev;
1726 struct hci_cp_le_create_big cp;
1727 struct iso_list_data data;
1728
1729 memset(&cp, 0, sizeof(cp));
1730
1731 data.big = qos->bcast.big;
1732 data.bis = qos->bcast.bis;
1733 data.count = 0;
1734
1735 /* Create a BIS for each bound connection */
1736 hci_conn_hash_list_state(hdev, bis_list, ISO_LINK,
1737 BT_BOUND, &data);
1738
1739 cp.handle = qos->bcast.big;
1740 cp.adv_handle = qos->bcast.bis;
1741 cp.num_bis = data.count;
1742 hci_cpu_to_le24(qos->bcast.out.interval, cp.bis.sdu_interval);
1743 cp.bis.sdu = cpu_to_le16(qos->bcast.out.sdu);
1744 cp.bis.latency = cpu_to_le16(qos->bcast.out.latency);
1745 cp.bis.rtn = qos->bcast.out.rtn;
1746 cp.bis.phy = qos->bcast.out.phy;
1747 cp.bis.packing = qos->bcast.packing;
1748 cp.bis.framing = qos->bcast.framing;
1749 cp.bis.encryption = qos->bcast.encryption;
1750 memcpy(cp.bis.bcode, qos->bcast.bcode, sizeof(cp.bis.bcode));
1751
1752 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
1753}
1754
1755static int set_cig_params_sync(struct hci_dev *hdev, void *data)
1756{
1757 u8 cig_id = PTR_UINT(data);
1758 struct hci_conn *conn;
1759 struct bt_iso_qos *qos;
1760 struct iso_cig_params pdu;
1761 u8 cis_id;
1762
1763 conn = hci_conn_hash_lookup_cig(hdev, cig_id);
1764 if (!conn)
1765 return 0;
1766
1767 memset(&pdu, 0, sizeof(pdu));
1768
1769 qos = &conn->iso_qos;
1770 pdu.cp.cig_id = cig_id;
1771 hci_cpu_to_le24(qos->ucast.out.interval, pdu.cp.c_interval);
1772 hci_cpu_to_le24(qos->ucast.in.interval, pdu.cp.p_interval);
1773 pdu.cp.sca = qos->ucast.sca;
1774 pdu.cp.packing = qos->ucast.packing;
1775 pdu.cp.framing = qos->ucast.framing;
1776 pdu.cp.c_latency = cpu_to_le16(qos->ucast.out.latency);
1777 pdu.cp.p_latency = cpu_to_le16(qos->ucast.in.latency);
1778
1779 /* Reprogram all CIS(s) with the same CIG, valid range are:
1780 * num_cis: 0x00 to 0x1F
1781 * cis_id: 0x00 to 0xEF
1782 */
1783 for (cis_id = 0x00; cis_id < 0xf0 &&
1784 pdu.cp.num_cis < ARRAY_SIZE(pdu.cis); cis_id++) {
1785 struct hci_cis_params *cis;
1786
1787 conn = hci_conn_hash_lookup_cis(hdev, NULL, 0, cig_id, cis_id);
1788 if (!conn)
1789 continue;
1790
1791 qos = &conn->iso_qos;
1792
1793 cis = &pdu.cis[pdu.cp.num_cis++];
1794 cis->cis_id = cis_id;
1795 cis->c_sdu = cpu_to_le16(conn->iso_qos.ucast.out.sdu);
1796 cis->p_sdu = cpu_to_le16(conn->iso_qos.ucast.in.sdu);
1797 cis->c_phy = qos->ucast.out.phy ? qos->ucast.out.phy :
1798 qos->ucast.in.phy;
1799 cis->p_phy = qos->ucast.in.phy ? qos->ucast.in.phy :
1800 qos->ucast.out.phy;
1801 cis->c_rtn = qos->ucast.out.rtn;
1802 cis->p_rtn = qos->ucast.in.rtn;
1803 }
1804
1805 if (!pdu.cp.num_cis)
1806 return 0;
1807
1808 return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1809 sizeof(pdu.cp) +
1810 pdu.cp.num_cis * sizeof(pdu.cis[0]), &pdu,
1811 HCI_CMD_TIMEOUT);
1812}
1813
1814static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1815{
1816 struct hci_dev *hdev = conn->hdev;
1817 struct iso_list_data data;
1818
1819 memset(&data, 0, sizeof(data));
1820
1821 /* Allocate first still reconfigurable CIG if not set */
1822 if (qos->ucast.cig == BT_ISO_QOS_CIG_UNSET) {
1823 for (data.cig = 0x00; data.cig < 0xf0; data.cig++) {
1824 data.count = 0;
1825
1826 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
1827 BT_CONNECT, &data);
1828 if (data.count)
1829 continue;
1830
1831 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK,
1832 BT_CONNECTED, &data);
1833 if (!data.count)
1834 break;
1835 }
1836
1837 if (data.cig == 0xf0)
1838 return false;
1839
1840 /* Update CIG */
1841 qos->ucast.cig = data.cig;
1842 }
1843
1844 if (qos->ucast.cis != BT_ISO_QOS_CIS_UNSET) {
1845 if (hci_conn_hash_lookup_cis(hdev, NULL, 0, qos->ucast.cig,
1846 qos->ucast.cis))
1847 return false;
1848 goto done;
1849 }
1850
1851 /* Allocate first available CIS if not set */
1852 for (data.cig = qos->ucast.cig, data.cis = 0x00; data.cis < 0xf0;
1853 data.cis++) {
1854 if (!hci_conn_hash_lookup_cis(hdev, NULL, 0, data.cig,
1855 data.cis)) {
1856 /* Update CIS */
1857 qos->ucast.cis = data.cis;
1858 break;
1859 }
1860 }
1861
1862 if (qos->ucast.cis == BT_ISO_QOS_CIS_UNSET)
1863 return false;
1864
1865done:
1866 if (hci_cmd_sync_queue(hdev, set_cig_params_sync,
1867 UINT_PTR(qos->ucast.cig), NULL) < 0)
1868 return false;
1869
1870 return true;
1871}
1872
1873struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1874 __u8 dst_type, struct bt_iso_qos *qos)
1875{
1876 struct hci_conn *cis;
1877
1878 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type, qos->ucast.cig,
1879 qos->ucast.cis);
1880 if (!cis) {
1881 cis = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1882 if (IS_ERR(cis))
1883 return cis;
1884 cis->cleanup = cis_cleanup;
1885 cis->dst_type = dst_type;
1886 cis->iso_qos.ucast.cig = BT_ISO_QOS_CIG_UNSET;
1887 cis->iso_qos.ucast.cis = BT_ISO_QOS_CIS_UNSET;
1888 }
1889
1890 if (cis->state == BT_CONNECTED)
1891 return cis;
1892
1893 /* Check if CIS has been set and the settings matches */
1894 if (cis->state == BT_BOUND &&
1895 !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
1896 return cis;
1897
1898 /* Update LINK PHYs according to QoS preference */
1899 cis->le_tx_phy = qos->ucast.out.phy;
1900 cis->le_rx_phy = qos->ucast.in.phy;
1901
1902 /* If output interval is not set use the input interval as it cannot be
1903 * 0x000000.
1904 */
1905 if (!qos->ucast.out.interval)
1906 qos->ucast.out.interval = qos->ucast.in.interval;
1907
1908 /* If input interval is not set use the output interval as it cannot be
1909 * 0x000000.
1910 */
1911 if (!qos->ucast.in.interval)
1912 qos->ucast.in.interval = qos->ucast.out.interval;
1913
1914 /* If output latency is not set use the input latency as it cannot be
1915 * 0x0000.
1916 */
1917 if (!qos->ucast.out.latency)
1918 qos->ucast.out.latency = qos->ucast.in.latency;
1919
1920 /* If input latency is not set use the output latency as it cannot be
1921 * 0x0000.
1922 */
1923 if (!qos->ucast.in.latency)
1924 qos->ucast.in.latency = qos->ucast.out.latency;
1925
1926 if (!hci_le_set_cig_params(cis, qos)) {
1927 hci_conn_drop(cis);
1928 return ERR_PTR(-EINVAL);
1929 }
1930
1931 hci_conn_hold(cis);
1932
1933 cis->iso_qos = *qos;
1934 cis->state = BT_BOUND;
1935
1936 return cis;
1937}
1938
1939bool hci_iso_setup_path(struct hci_conn *conn)
1940{
1941 struct hci_dev *hdev = conn->hdev;
1942 struct hci_cp_le_setup_iso_path cmd;
1943
1944 memset(&cmd, 0, sizeof(cmd));
1945
1946 if (conn->iso_qos.ucast.out.sdu) {
1947 cmd.handle = cpu_to_le16(conn->handle);
1948 cmd.direction = 0x00; /* Input (Host to Controller) */
1949 cmd.path = 0x00; /* HCI path if enabled */
1950 cmd.codec = 0x03; /* Transparent Data */
1951
1952 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
1953 &cmd) < 0)
1954 return false;
1955 }
1956
1957 if (conn->iso_qos.ucast.in.sdu) {
1958 cmd.handle = cpu_to_le16(conn->handle);
1959 cmd.direction = 0x01; /* Output (Controller to Host) */
1960 cmd.path = 0x00; /* HCI path if enabled */
1961 cmd.codec = 0x03; /* Transparent Data */
1962
1963 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
1964 &cmd) < 0)
1965 return false;
1966 }
1967
1968 return true;
1969}
1970
1971int hci_conn_check_create_cis(struct hci_conn *conn)
1972{
1973 if (conn->type != ISO_LINK || !bacmp(&conn->dst, BDADDR_ANY))
1974 return -EINVAL;
1975
1976 if (!conn->parent || conn->parent->state != BT_CONNECTED ||
1977 conn->state != BT_CONNECT || HCI_CONN_HANDLE_UNSET(conn->handle))
1978 return 1;
1979
1980 return 0;
1981}
1982
1983static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
1984{
1985 return hci_le_create_cis_sync(hdev);
1986}
1987
1988int hci_le_create_cis_pending(struct hci_dev *hdev)
1989{
1990 struct hci_conn *conn;
1991 bool pending = false;
1992
1993 rcu_read_lock();
1994
1995 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
1996 if (test_bit(HCI_CONN_CREATE_CIS, &conn->flags)) {
1997 rcu_read_unlock();
1998 return -EBUSY;
1999 }
2000
2001 if (!hci_conn_check_create_cis(conn))
2002 pending = true;
2003 }
2004
2005 rcu_read_unlock();
2006
2007 if (!pending)
2008 return 0;
2009
2010 /* Queue Create CIS */
2011 return hci_cmd_sync_queue(hdev, hci_create_cis_sync, NULL, NULL);
2012}
2013
2014static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
2015 struct bt_iso_io_qos *qos, __u8 phy)
2016{
2017 /* Only set MTU if PHY is enabled */
2018 if (!qos->sdu && qos->phy)
2019 qos->sdu = conn->mtu;
2020
2021 /* Use the same PHY as ACL if set to any */
2022 if (qos->phy == BT_ISO_PHY_ANY)
2023 qos->phy = phy;
2024
2025 /* Use LE ACL connection interval if not set */
2026 if (!qos->interval)
2027 /* ACL interval unit in 1.25 ms to us */
2028 qos->interval = conn->le_conn_interval * 1250;
2029
2030 /* Use LE ACL connection latency if not set */
2031 if (!qos->latency)
2032 qos->latency = conn->le_conn_latency;
2033}
2034
2035static int create_big_sync(struct hci_dev *hdev, void *data)
2036{
2037 struct hci_conn *conn = data;
2038 struct bt_iso_qos *qos = &conn->iso_qos;
2039 u16 interval, sync_interval = 0;
2040 u32 flags = 0;
2041 int err;
2042
2043 if (qos->bcast.out.phy == 0x02)
2044 flags |= MGMT_ADV_FLAG_SEC_2M;
2045
2046 /* Align intervals */
2047 interval = (qos->bcast.out.interval / 1250) * qos->bcast.sync_factor;
2048
2049 if (qos->bcast.bis)
2050 sync_interval = interval * 4;
2051
2052 err = hci_start_per_adv_sync(hdev, qos->bcast.bis, conn->le_per_adv_data_len,
2053 conn->le_per_adv_data, flags, interval,
2054 interval, sync_interval);
2055 if (err)
2056 return err;
2057
2058 return hci_le_create_big(conn, &conn->iso_qos);
2059}
2060
2061static void create_pa_complete(struct hci_dev *hdev, void *data, int err)
2062{
2063 struct hci_cp_le_pa_create_sync *cp = data;
2064
2065 bt_dev_dbg(hdev, "");
2066
2067 if (err)
2068 bt_dev_err(hdev, "Unable to create PA: %d", err);
2069
2070 kfree(cp);
2071}
2072
2073static int create_pa_sync(struct hci_dev *hdev, void *data)
2074{
2075 struct hci_cp_le_pa_create_sync *cp = data;
2076 int err;
2077
2078 err = __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_CREATE_SYNC,
2079 sizeof(*cp), cp, HCI_CMD_TIMEOUT);
2080 if (err) {
2081 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2082 return err;
2083 }
2084
2085 return hci_update_passive_scan_sync(hdev);
2086}
2087
2088struct hci_conn *hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst,
2089 __u8 dst_type, __u8 sid,
2090 struct bt_iso_qos *qos)
2091{
2092 struct hci_cp_le_pa_create_sync *cp;
2093 struct hci_conn *conn;
2094 int err;
2095
2096 if (hci_dev_test_and_set_flag(hdev, HCI_PA_SYNC))
2097 return ERR_PTR(-EBUSY);
2098
2099 conn = hci_conn_add_unset(hdev, ISO_LINK, dst, HCI_ROLE_SLAVE);
2100 if (IS_ERR(conn))
2101 return conn;
2102
2103 conn->iso_qos = *qos;
2104 conn->state = BT_LISTEN;
2105
2106 hci_conn_hold(conn);
2107
2108 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
2109 if (!cp) {
2110 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2111 hci_conn_drop(conn);
2112 return ERR_PTR(-ENOMEM);
2113 }
2114
2115 cp->options = qos->bcast.options;
2116 cp->sid = sid;
2117 cp->addr_type = dst_type;
2118 bacpy(&cp->addr, dst);
2119 cp->skip = cpu_to_le16(qos->bcast.skip);
2120 cp->sync_timeout = cpu_to_le16(qos->bcast.sync_timeout);
2121 cp->sync_cte_type = qos->bcast.sync_cte_type;
2122
2123 /* Queue start pa_create_sync and scan */
2124 err = hci_cmd_sync_queue(hdev, create_pa_sync, cp, create_pa_complete);
2125 if (err < 0) {
2126 hci_conn_drop(conn);
2127 kfree(cp);
2128 return ERR_PTR(err);
2129 }
2130
2131 return conn;
2132}
2133
2134int hci_le_big_create_sync(struct hci_dev *hdev, struct hci_conn *hcon,
2135 struct bt_iso_qos *qos,
2136 __u16 sync_handle, __u8 num_bis, __u8 bis[])
2137{
2138 struct _packed {
2139 struct hci_cp_le_big_create_sync cp;
2140 __u8 bis[0x11];
2141 } pdu;
2142 int err;
2143
2144 if (num_bis < 0x01 || num_bis > sizeof(pdu.bis))
2145 return -EINVAL;
2146
2147 err = qos_set_big(hdev, qos);
2148 if (err)
2149 return err;
2150
2151 if (hcon)
2152 hcon->iso_qos.bcast.big = qos->bcast.big;
2153
2154 memset(&pdu, 0, sizeof(pdu));
2155 pdu.cp.handle = qos->bcast.big;
2156 pdu.cp.sync_handle = cpu_to_le16(sync_handle);
2157 pdu.cp.encryption = qos->bcast.encryption;
2158 memcpy(pdu.cp.bcode, qos->bcast.bcode, sizeof(pdu.cp.bcode));
2159 pdu.cp.mse = qos->bcast.mse;
2160 pdu.cp.timeout = cpu_to_le16(qos->bcast.timeout);
2161 pdu.cp.num_bis = num_bis;
2162 memcpy(pdu.bis, bis, num_bis);
2163
2164 return hci_send_cmd(hdev, HCI_OP_LE_BIG_CREATE_SYNC,
2165 sizeof(pdu.cp) + num_bis, &pdu);
2166}
2167
2168static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2169{
2170 struct hci_conn *conn = data;
2171
2172 bt_dev_dbg(hdev, "conn %p", conn);
2173
2174 if (err) {
2175 bt_dev_err(hdev, "Unable to create BIG: %d", err);
2176 hci_connect_cfm(conn, err);
2177 hci_conn_del(conn);
2178 }
2179}
2180
2181struct hci_conn *hci_bind_bis(struct hci_dev *hdev, bdaddr_t *dst,
2182 struct bt_iso_qos *qos,
2183 __u8 base_len, __u8 *base)
2184{
2185 struct hci_conn *conn;
2186 struct hci_conn *parent;
2187 __u8 eir[HCI_MAX_PER_AD_LENGTH];
2188 struct hci_link *link;
2189
2190 /* Look for any BIS that is open for rebinding */
2191 conn = hci_conn_hash_lookup_big_state(hdev, qos->bcast.big, BT_OPEN);
2192 if (conn) {
2193 memcpy(qos, &conn->iso_qos, sizeof(*qos));
2194 conn->state = BT_CONNECTED;
2195 return conn;
2196 }
2197
2198 if (base_len && base)
2199 base_len = eir_append_service_data(eir, 0, 0x1851,
2200 base, base_len);
2201
2202 /* We need hci_conn object using the BDADDR_ANY as dst */
2203 conn = hci_add_bis(hdev, dst, qos, base_len, eir);
2204 if (IS_ERR(conn))
2205 return conn;
2206
2207 /* Update LINK PHYs according to QoS preference */
2208 conn->le_tx_phy = qos->bcast.out.phy;
2209 conn->le_tx_phy = qos->bcast.out.phy;
2210
2211 /* Add Basic Announcement into Peridic Adv Data if BASE is set */
2212 if (base_len && base) {
2213 memcpy(conn->le_per_adv_data, eir, sizeof(eir));
2214 conn->le_per_adv_data_len = base_len;
2215 }
2216
2217 hci_iso_qos_setup(hdev, conn, &qos->bcast.out,
2218 conn->le_tx_phy ? conn->le_tx_phy :
2219 hdev->le_tx_def_phys);
2220
2221 conn->iso_qos = *qos;
2222 conn->state = BT_BOUND;
2223
2224 /* Link BISes together */
2225 parent = hci_conn_hash_lookup_big(hdev,
2226 conn->iso_qos.bcast.big);
2227 if (parent && parent != conn) {
2228 link = hci_conn_link(parent, conn);
2229 if (!link) {
2230 hci_conn_drop(conn);
2231 return ERR_PTR(-ENOLINK);
2232 }
2233
2234 /* Link takes the refcount */
2235 hci_conn_drop(conn);
2236 }
2237
2238 return conn;
2239}
2240
2241static void bis_mark_per_adv(struct hci_conn *conn, void *data)
2242{
2243 struct iso_list_data *d = data;
2244
2245 /* Skip if not broadcast/ANY address */
2246 if (bacmp(&conn->dst, BDADDR_ANY))
2247 return;
2248
2249 if (d->big != conn->iso_qos.bcast.big ||
2250 d->bis == BT_ISO_QOS_BIS_UNSET ||
2251 d->bis != conn->iso_qos.bcast.bis)
2252 return;
2253
2254 set_bit(HCI_CONN_PER_ADV, &conn->flags);
2255}
2256
2257struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2258 __u8 dst_type, struct bt_iso_qos *qos,
2259 __u8 base_len, __u8 *base)
2260{
2261 struct hci_conn *conn;
2262 int err;
2263 struct iso_list_data data;
2264
2265 conn = hci_bind_bis(hdev, dst, qos, base_len, base);
2266 if (IS_ERR(conn))
2267 return conn;
2268
2269 if (conn->state == BT_CONNECTED)
2270 return conn;
2271
2272 data.big = qos->bcast.big;
2273 data.bis = qos->bcast.bis;
2274
2275 /* Set HCI_CONN_PER_ADV for all bound connections, to mark that
2276 * the start periodic advertising and create BIG commands have
2277 * been queued
2278 */
2279 hci_conn_hash_list_state(hdev, bis_mark_per_adv, ISO_LINK,
2280 BT_BOUND, &data);
2281
2282 /* Queue start periodic advertising and create BIG */
2283 err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
2284 create_big_complete);
2285 if (err < 0) {
2286 hci_conn_drop(conn);
2287 return ERR_PTR(err);
2288 }
2289
2290 return conn;
2291}
2292
2293struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2294 __u8 dst_type, struct bt_iso_qos *qos)
2295{
2296 struct hci_conn *le;
2297 struct hci_conn *cis;
2298 struct hci_link *link;
2299
2300 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2301 le = hci_connect_le(hdev, dst, dst_type, false,
2302 BT_SECURITY_LOW,
2303 HCI_LE_CONN_TIMEOUT,
2304 HCI_ROLE_SLAVE, 0, 0);
2305 else
2306 le = hci_connect_le_scan(hdev, dst, dst_type,
2307 BT_SECURITY_LOW,
2308 HCI_LE_CONN_TIMEOUT,
2309 CONN_REASON_ISO_CONNECT);
2310 if (IS_ERR(le))
2311 return le;
2312
2313 hci_iso_qos_setup(hdev, le, &qos->ucast.out,
2314 le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
2315 hci_iso_qos_setup(hdev, le, &qos->ucast.in,
2316 le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
2317
2318 cis = hci_bind_cis(hdev, dst, dst_type, qos);
2319 if (IS_ERR(cis)) {
2320 hci_conn_drop(le);
2321 return cis;
2322 }
2323
2324 link = hci_conn_link(le, cis);
2325 if (!link) {
2326 hci_conn_drop(le);
2327 hci_conn_drop(cis);
2328 return ERR_PTR(-ENOLINK);
2329 }
2330
2331 /* Link takes the refcount */
2332 hci_conn_drop(cis);
2333
2334 cis->state = BT_CONNECT;
2335
2336 hci_le_create_cis_pending(hdev);
2337
2338 return cis;
2339}
2340
2341/* Check link security requirement */
2342int hci_conn_check_link_mode(struct hci_conn *conn)
2343{
2344 BT_DBG("hcon %p", conn);
2345
2346 /* In Secure Connections Only mode, it is required that Secure
2347 * Connections is used and the link is encrypted with AES-CCM
2348 * using a P-256 authenticated combination key.
2349 */
2350 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2351 if (!hci_conn_sc_enabled(conn) ||
2352 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2353 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2354 return 0;
2355 }
2356
2357 /* AES encryption is required for Level 4:
2358 *
2359 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2360 * page 1319:
2361 *
2362 * 128-bit equivalent strength for link and encryption keys
2363 * required using FIPS approved algorithms (E0 not allowed,
2364 * SAFER+ not allowed, and P-192 not allowed; encryption key
2365 * not shortened)
2366 */
2367 if (conn->sec_level == BT_SECURITY_FIPS &&
2368 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2369 bt_dev_err(conn->hdev,
2370 "Invalid security: Missing AES-CCM usage");
2371 return 0;
2372 }
2373
2374 if (hci_conn_ssp_enabled(conn) &&
2375 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2376 return 0;
2377
2378 return 1;
2379}
2380
2381/* Authenticate remote device */
2382static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2383{
2384 BT_DBG("hcon %p", conn);
2385
2386 if (conn->pending_sec_level > sec_level)
2387 sec_level = conn->pending_sec_level;
2388
2389 if (sec_level > conn->sec_level)
2390 conn->pending_sec_level = sec_level;
2391 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2392 return 1;
2393
2394 /* Make sure we preserve an existing MITM requirement*/
2395 auth_type |= (conn->auth_type & 0x01);
2396
2397 conn->auth_type = auth_type;
2398
2399 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
2400 struct hci_cp_auth_requested cp;
2401
2402 cp.handle = cpu_to_le16(conn->handle);
2403 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
2404 sizeof(cp), &cp);
2405
2406 /* Set the ENCRYPT_PEND to trigger encryption after
2407 * authentication.
2408 */
2409 if (!test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2410 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
2411 }
2412
2413 return 0;
2414}
2415
2416/* Encrypt the link */
2417static void hci_conn_encrypt(struct hci_conn *conn)
2418{
2419 BT_DBG("hcon %p", conn);
2420
2421 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
2422 struct hci_cp_set_conn_encrypt cp;
2423 cp.handle = cpu_to_le16(conn->handle);
2424 cp.encrypt = 0x01;
2425 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
2426 &cp);
2427 }
2428}
2429
2430/* Enable security */
2431int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2432 bool initiator)
2433{
2434 BT_DBG("hcon %p", conn);
2435
2436 if (conn->type == LE_LINK)
2437 return smp_conn_security(conn, sec_level);
2438
2439 /* For sdp we don't need the link key. */
2440 if (sec_level == BT_SECURITY_SDP)
2441 return 1;
2442
2443 /* For non 2.1 devices and low security level we don't need the link
2444 key. */
2445 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2446 return 1;
2447
2448 /* For other security levels we need the link key. */
2449 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2450 goto auth;
2451
2452 switch (conn->key_type) {
2453 case HCI_LK_AUTH_COMBINATION_P256:
2454 /* An authenticated FIPS approved combination key has
2455 * sufficient security for security level 4 or lower.
2456 */
2457 if (sec_level <= BT_SECURITY_FIPS)
2458 goto encrypt;
2459 break;
2460 case HCI_LK_AUTH_COMBINATION_P192:
2461 /* An authenticated combination key has sufficient security for
2462 * security level 3 or lower.
2463 */
2464 if (sec_level <= BT_SECURITY_HIGH)
2465 goto encrypt;
2466 break;
2467 case HCI_LK_UNAUTH_COMBINATION_P192:
2468 case HCI_LK_UNAUTH_COMBINATION_P256:
2469 /* An unauthenticated combination key has sufficient security
2470 * for security level 2 or lower.
2471 */
2472 if (sec_level <= BT_SECURITY_MEDIUM)
2473 goto encrypt;
2474 break;
2475 case HCI_LK_COMBINATION:
2476 /* A combination key has always sufficient security for the
2477 * security levels 2 or lower. High security level requires the
2478 * combination key is generated using maximum PIN code length
2479 * (16). For pre 2.1 units.
2480 */
2481 if (sec_level <= BT_SECURITY_MEDIUM || conn->pin_length == 16)
2482 goto encrypt;
2483 break;
2484 default:
2485 break;
2486 }
2487
2488auth:
2489 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2490 return 0;
2491
2492 if (initiator)
2493 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
2494
2495 if (!hci_conn_auth(conn, sec_level, auth_type))
2496 return 0;
2497
2498encrypt:
2499 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2500 /* Ensure that the encryption key size has been read,
2501 * otherwise stall the upper layer responses.
2502 */
2503 if (!conn->enc_key_size)
2504 return 0;
2505
2506 /* Nothing else needed, all requirements are met */
2507 return 1;
2508 }
2509
2510 hci_conn_encrypt(conn);
2511 return 0;
2512}
2513EXPORT_SYMBOL(hci_conn_security);
2514
2515/* Check secure link requirement */
2516int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2517{
2518 BT_DBG("hcon %p", conn);
2519
2520 /* Accept if non-secure or higher security level is required */
2521 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2522 return 1;
2523
2524 /* Accept if secure or higher security level is already present */
2525 if (conn->sec_level == BT_SECURITY_HIGH ||
2526 conn->sec_level == BT_SECURITY_FIPS)
2527 return 1;
2528
2529 /* Reject not secure link */
2530 return 0;
2531}
2532EXPORT_SYMBOL(hci_conn_check_secure);
2533
2534/* Switch role */
2535int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2536{
2537 BT_DBG("hcon %p", conn);
2538
2539 if (role == conn->role)
2540 return 1;
2541
2542 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
2543 struct hci_cp_switch_role cp;
2544 bacpy(&cp.bdaddr, &conn->dst);
2545 cp.role = role;
2546 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
2547 }
2548
2549 return 0;
2550}
2551EXPORT_SYMBOL(hci_conn_switch_role);
2552
2553/* Enter active mode */
2554void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2555{
2556 struct hci_dev *hdev = conn->hdev;
2557
2558 BT_DBG("hcon %p mode %d", conn, conn->mode);
2559
2560 if (conn->mode != HCI_CM_SNIFF)
2561 goto timer;
2562
2563 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2564 goto timer;
2565
2566 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
2567 struct hci_cp_exit_sniff_mode cp;
2568 cp.handle = cpu_to_le16(conn->handle);
2569 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
2570 }
2571
2572timer:
2573 if (hdev->idle_timeout > 0)
2574 queue_delayed_work(hdev->workqueue, &conn->idle_work,
2575 msecs_to_jiffies(hdev->idle_timeout));
2576}
2577
2578/* Drop all connection on the device */
2579void hci_conn_hash_flush(struct hci_dev *hdev)
2580{
2581 struct list_head *head = &hdev->conn_hash.list;
2582 struct hci_conn *conn;
2583
2584 BT_DBG("hdev %s", hdev->name);
2585
2586 /* We should not traverse the list here, because hci_conn_del
2587 * can remove extra links, which may cause the list traversal
2588 * to hit items that have already been released.
2589 */
2590 while ((conn = list_first_entry_or_null(head,
2591 struct hci_conn,
2592 list)) != NULL) {
2593 conn->state = BT_CLOSED;
2594 hci_disconn_cfm(conn, HCI_ERROR_LOCAL_HOST_TERM);
2595 hci_conn_del(conn);
2596 }
2597}
2598
2599static u32 get_link_mode(struct hci_conn *conn)
2600{
2601 u32 link_mode = 0;
2602
2603 if (conn->role == HCI_ROLE_MASTER)
2604 link_mode |= HCI_LM_MASTER;
2605
2606 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2607 link_mode |= HCI_LM_ENCRYPT;
2608
2609 if (test_bit(HCI_CONN_AUTH, &conn->flags))
2610 link_mode |= HCI_LM_AUTH;
2611
2612 if (test_bit(HCI_CONN_SECURE, &conn->flags))
2613 link_mode |= HCI_LM_SECURE;
2614
2615 if (test_bit(HCI_CONN_FIPS, &conn->flags))
2616 link_mode |= HCI_LM_FIPS;
2617
2618 return link_mode;
2619}
2620
2621int hci_get_conn_list(void __user *arg)
2622{
2623 struct hci_conn *c;
2624 struct hci_conn_list_req req, *cl;
2625 struct hci_conn_info *ci;
2626 struct hci_dev *hdev;
2627 int n = 0, size, err;
2628
2629 if (copy_from_user(&req, arg, sizeof(req)))
2630 return -EFAULT;
2631
2632 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2633 return -EINVAL;
2634
2635 size = sizeof(req) + req.conn_num * sizeof(*ci);
2636
2637 cl = kmalloc(size, GFP_KERNEL);
2638 if (!cl)
2639 return -ENOMEM;
2640
2641 hdev = hci_dev_get(req.dev_id);
2642 if (!hdev) {
2643 kfree(cl);
2644 return -ENODEV;
2645 }
2646
2647 ci = cl->conn_info;
2648
2649 hci_dev_lock(hdev);
2650 list_for_each_entry(c, &hdev->conn_hash.list, list) {
2651 bacpy(&(ci + n)->bdaddr, &c->dst);
2652 (ci + n)->handle = c->handle;
2653 (ci + n)->type = c->type;
2654 (ci + n)->out = c->out;
2655 (ci + n)->state = c->state;
2656 (ci + n)->link_mode = get_link_mode(c);
2657 if (++n >= req.conn_num)
2658 break;
2659 }
2660 hci_dev_unlock(hdev);
2661
2662 cl->dev_id = hdev->id;
2663 cl->conn_num = n;
2664 size = sizeof(req) + n * sizeof(*ci);
2665
2666 hci_dev_put(hdev);
2667
2668 err = copy_to_user(arg, cl, size);
2669 kfree(cl);
2670
2671 return err ? -EFAULT : 0;
2672}
2673
2674int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2675{
2676 struct hci_conn_info_req req;
2677 struct hci_conn_info ci;
2678 struct hci_conn *conn;
2679 char __user *ptr = arg + sizeof(req);
2680
2681 if (copy_from_user(&req, arg, sizeof(req)))
2682 return -EFAULT;
2683
2684 hci_dev_lock(hdev);
2685 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
2686 if (conn) {
2687 bacpy(&ci.bdaddr, &conn->dst);
2688 ci.handle = conn->handle;
2689 ci.type = conn->type;
2690 ci.out = conn->out;
2691 ci.state = conn->state;
2692 ci.link_mode = get_link_mode(conn);
2693 }
2694 hci_dev_unlock(hdev);
2695
2696 if (!conn)
2697 return -ENOENT;
2698
2699 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
2700}
2701
2702int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2703{
2704 struct hci_auth_info_req req;
2705 struct hci_conn *conn;
2706
2707 if (copy_from_user(&req, arg, sizeof(req)))
2708 return -EFAULT;
2709
2710 hci_dev_lock(hdev);
2711 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
2712 if (conn)
2713 req.type = conn->auth_type;
2714 hci_dev_unlock(hdev);
2715
2716 if (!conn)
2717 return -ENOENT;
2718
2719 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
2720}
2721
2722struct hci_chan *hci_chan_create(struct hci_conn *conn)
2723{
2724 struct hci_dev *hdev = conn->hdev;
2725 struct hci_chan *chan;
2726
2727 BT_DBG("%s hcon %p", hdev->name, conn);
2728
2729 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2730 BT_DBG("Refusing to create new hci_chan");
2731 return NULL;
2732 }
2733
2734 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
2735 if (!chan)
2736 return NULL;
2737
2738 chan->conn = hci_conn_get(conn);
2739 skb_queue_head_init(&chan->data_q);
2740 chan->state = BT_CONNECTED;
2741
2742 list_add_rcu(&chan->list, &conn->chan_list);
2743
2744 return chan;
2745}
2746
2747void hci_chan_del(struct hci_chan *chan)
2748{
2749 struct hci_conn *conn = chan->conn;
2750 struct hci_dev *hdev = conn->hdev;
2751
2752 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2753
2754 list_del_rcu(&chan->list);
2755
2756 synchronize_rcu();
2757
2758 /* Prevent new hci_chan's to be created for this hci_conn */
2759 set_bit(HCI_CONN_DROP, &conn->flags);
2760
2761 hci_conn_put(conn);
2762
2763 skb_queue_purge(&chan->data_q);
2764 kfree(chan);
2765}
2766
2767void hci_chan_list_flush(struct hci_conn *conn)
2768{
2769 struct hci_chan *chan, *n;
2770
2771 BT_DBG("hcon %p", conn);
2772
2773 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2774 hci_chan_del(chan);
2775}
2776
2777static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2778 __u16 handle)
2779{
2780 struct hci_chan *hchan;
2781
2782 list_for_each_entry(hchan, &hcon->chan_list, list) {
2783 if (hchan->handle == handle)
2784 return hchan;
2785 }
2786
2787 return NULL;
2788}
2789
2790struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2791{
2792 struct hci_conn_hash *h = &hdev->conn_hash;
2793 struct hci_conn *hcon;
2794 struct hci_chan *hchan = NULL;
2795
2796 rcu_read_lock();
2797
2798 list_for_each_entry_rcu(hcon, &h->list, list) {
2799 hchan = __hci_chan_lookup_handle(hcon, handle);
2800 if (hchan)
2801 break;
2802 }
2803
2804 rcu_read_unlock();
2805
2806 return hchan;
2807}
2808
2809u32 hci_conn_get_phy(struct hci_conn *conn)
2810{
2811 u32 phys = 0;
2812
2813 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2814 * Table 6.2: Packets defined for synchronous, asynchronous, and
2815 * CPB logical transport types.
2816 */
2817 switch (conn->type) {
2818 case SCO_LINK:
2819 /* SCO logical transport (1 Mb/s):
2820 * HV1, HV2, HV3 and DV.
2821 */
2822 phys |= BT_PHY_BR_1M_1SLOT;
2823
2824 break;
2825
2826 case ACL_LINK:
2827 /* ACL logical transport (1 Mb/s) ptt=0:
2828 * DH1, DM3, DH3, DM5 and DH5.
2829 */
2830 phys |= BT_PHY_BR_1M_1SLOT;
2831
2832 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2833 phys |= BT_PHY_BR_1M_3SLOT;
2834
2835 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2836 phys |= BT_PHY_BR_1M_5SLOT;
2837
2838 /* ACL logical transport (2 Mb/s) ptt=1:
2839 * 2-DH1, 2-DH3 and 2-DH5.
2840 */
2841 if (!(conn->pkt_type & HCI_2DH1))
2842 phys |= BT_PHY_EDR_2M_1SLOT;
2843
2844 if (!(conn->pkt_type & HCI_2DH3))
2845 phys |= BT_PHY_EDR_2M_3SLOT;
2846
2847 if (!(conn->pkt_type & HCI_2DH5))
2848 phys |= BT_PHY_EDR_2M_5SLOT;
2849
2850 /* ACL logical transport (3 Mb/s) ptt=1:
2851 * 3-DH1, 3-DH3 and 3-DH5.
2852 */
2853 if (!(conn->pkt_type & HCI_3DH1))
2854 phys |= BT_PHY_EDR_3M_1SLOT;
2855
2856 if (!(conn->pkt_type & HCI_3DH3))
2857 phys |= BT_PHY_EDR_3M_3SLOT;
2858
2859 if (!(conn->pkt_type & HCI_3DH5))
2860 phys |= BT_PHY_EDR_3M_5SLOT;
2861
2862 break;
2863
2864 case ESCO_LINK:
2865 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2866 phys |= BT_PHY_BR_1M_1SLOT;
2867
2868 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2869 phys |= BT_PHY_BR_1M_3SLOT;
2870
2871 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2872 if (!(conn->pkt_type & ESCO_2EV3))
2873 phys |= BT_PHY_EDR_2M_1SLOT;
2874
2875 if (!(conn->pkt_type & ESCO_2EV5))
2876 phys |= BT_PHY_EDR_2M_3SLOT;
2877
2878 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2879 if (!(conn->pkt_type & ESCO_3EV3))
2880 phys |= BT_PHY_EDR_3M_1SLOT;
2881
2882 if (!(conn->pkt_type & ESCO_3EV5))
2883 phys |= BT_PHY_EDR_3M_3SLOT;
2884
2885 break;
2886
2887 case LE_LINK:
2888 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
2889 phys |= BT_PHY_LE_1M_TX;
2890
2891 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
2892 phys |= BT_PHY_LE_1M_RX;
2893
2894 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
2895 phys |= BT_PHY_LE_2M_TX;
2896
2897 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
2898 phys |= BT_PHY_LE_2M_RX;
2899
2900 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
2901 phys |= BT_PHY_LE_CODED_TX;
2902
2903 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
2904 phys |= BT_PHY_LE_CODED_RX;
2905
2906 break;
2907 }
2908
2909 return phys;
2910}
2911
2912static int abort_conn_sync(struct hci_dev *hdev, void *data)
2913{
2914 struct hci_conn *conn = data;
2915
2916 if (!hci_conn_valid(hdev, conn))
2917 return -ECANCELED;
2918
2919 return hci_abort_conn_sync(hdev, conn, conn->abort_reason);
2920}
2921
2922int hci_abort_conn(struct hci_conn *conn, u8 reason)
2923{
2924 struct hci_dev *hdev = conn->hdev;
2925
2926 /* If abort_reason has already been set it means the connection is
2927 * already being aborted so don't attempt to overwrite it.
2928 */
2929 if (conn->abort_reason)
2930 return 0;
2931
2932 bt_dev_dbg(hdev, "handle 0x%2.2x reason 0x%2.2x", conn->handle, reason);
2933
2934 conn->abort_reason = reason;
2935
2936 /* If the connection is pending check the command opcode since that
2937 * might be blocking on hci_cmd_sync_work while waiting its respective
2938 * event so we need to hci_cmd_sync_cancel to cancel it.
2939 *
2940 * hci_connect_le serializes the connection attempts so only one
2941 * connection can be in BT_CONNECT at time.
2942 */
2943 if (conn->state == BT_CONNECT && hdev->req_status == HCI_REQ_PEND) {
2944 switch (hci_skb_event(hdev->sent_cmd)) {
2945 case HCI_EV_CONN_COMPLETE:
2946 case HCI_EV_LE_CONN_COMPLETE:
2947 case HCI_EV_LE_ENHANCED_CONN_COMPLETE:
2948 case HCI_EVT_LE_CIS_ESTABLISHED:
2949 hci_cmd_sync_cancel(hdev, ECANCELED);
2950 break;
2951 }
2952 /* Cancel connect attempt if still queued/pending */
2953 } else if (!hci_cancel_connect_sync(hdev, conn)) {
2954 return 0;
2955 }
2956
2957 return hci_cmd_sync_queue_once(hdev, abort_conn_sync, conn, NULL);
2958}