Loading...
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 /* Set Default Authenticated payload timeout to 30s */
524 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
525
526 if (conn->role == HCI_ROLE_MASTER)
527 conn->out = true;
528
529 switch (type) {
530 case ACL_LINK:
531 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
532 break;
533 case LE_LINK:
534 /* conn->src should reflect the local identity address */
535 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
536 break;
537 case SCO_LINK:
538 if (lmp_esco_capable(hdev))
539 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
540 (hdev->esco_type & EDR_ESCO_MASK);
541 else
542 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
543 break;
544 case ESCO_LINK:
545 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
546 break;
547 }
548
549 skb_queue_head_init(&conn->data_q);
550
551 INIT_LIST_HEAD(&conn->chan_list);
552
553 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
554 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
555 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
556 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
557 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
558
559 atomic_set(&conn->refcnt, 0);
560
561 hci_dev_hold(hdev);
562
563 hci_conn_hash_add(hdev, conn);
564 if (hdev->notify)
565 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
566
567 hci_conn_init_sysfs(conn);
568
569 return conn;
570}
571
572int hci_conn_del(struct hci_conn *conn)
573{
574 struct hci_dev *hdev = conn->hdev;
575
576 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
577
578 cancel_delayed_work_sync(&conn->disc_work);
579 cancel_delayed_work_sync(&conn->auto_accept_work);
580 cancel_delayed_work_sync(&conn->idle_work);
581
582 if (conn->type == ACL_LINK) {
583 struct hci_conn *sco = conn->link;
584 if (sco)
585 sco->link = NULL;
586
587 /* Unacked frames */
588 hdev->acl_cnt += conn->sent;
589 } else if (conn->type == LE_LINK) {
590 cancel_delayed_work(&conn->le_conn_timeout);
591
592 if (hdev->le_pkts)
593 hdev->le_cnt += conn->sent;
594 else
595 hdev->acl_cnt += conn->sent;
596 } else {
597 struct hci_conn *acl = conn->link;
598 if (acl) {
599 acl->link = NULL;
600 hci_conn_drop(acl);
601 }
602 }
603
604 if (conn->amp_mgr)
605 amp_mgr_put(conn->amp_mgr);
606
607 skb_queue_purge(&conn->data_q);
608
609 /* Remove the connection from the list and cleanup its remaining
610 * state. This is a separate function since for some cases like
611 * BT_CONNECT_SCAN we *only* want the cleanup part without the
612 * rest of hci_conn_del.
613 */
614 hci_conn_cleanup(conn);
615
616 return 0;
617}
618
619struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
620{
621 int use_src = bacmp(src, BDADDR_ANY);
622 struct hci_dev *hdev = NULL, *d;
623
624 BT_DBG("%pMR -> %pMR", src, dst);
625
626 read_lock(&hci_dev_list_lock);
627
628 list_for_each_entry(d, &hci_dev_list, list) {
629 if (!test_bit(HCI_UP, &d->flags) ||
630 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
631 d->dev_type != HCI_PRIMARY)
632 continue;
633
634 /* Simple routing:
635 * No source address - find interface with bdaddr != dst
636 * Source address - find interface with bdaddr == src
637 */
638
639 if (use_src) {
640 bdaddr_t id_addr;
641 u8 id_addr_type;
642
643 if (src_type == BDADDR_BREDR) {
644 if (!lmp_bredr_capable(d))
645 continue;
646 bacpy(&id_addr, &d->bdaddr);
647 id_addr_type = BDADDR_BREDR;
648 } else {
649 if (!lmp_le_capable(d))
650 continue;
651
652 hci_copy_identity_address(d, &id_addr,
653 &id_addr_type);
654
655 /* Convert from HCI to three-value type */
656 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
657 id_addr_type = BDADDR_LE_PUBLIC;
658 else
659 id_addr_type = BDADDR_LE_RANDOM;
660 }
661
662 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
663 hdev = d; break;
664 }
665 } else {
666 if (bacmp(&d->bdaddr, dst)) {
667 hdev = d; break;
668 }
669 }
670 }
671
672 if (hdev)
673 hdev = hci_dev_hold(hdev);
674
675 read_unlock(&hci_dev_list_lock);
676 return hdev;
677}
678EXPORT_SYMBOL(hci_get_route);
679
680/* This function requires the caller holds hdev->lock */
681void hci_le_conn_failed(struct hci_conn *conn, u8 status)
682{
683 struct hci_dev *hdev = conn->hdev;
684 struct hci_conn_params *params;
685
686 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
687 conn->dst_type);
688 if (params && params->conn) {
689 hci_conn_drop(params->conn);
690 hci_conn_put(params->conn);
691 params->conn = NULL;
692 }
693
694 conn->state = BT_CLOSED;
695
696 /* If the status indicates successful cancellation of
697 * the attempt (i.e. Unkown Connection Id) there's no point of
698 * notifying failure since we'll go back to keep trying to
699 * connect. The only exception is explicit connect requests
700 * where a timeout + cancel does indicate an actual failure.
701 */
702 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
703 (params && params->explicit_connect))
704 mgmt_connect_failed(hdev, &conn->dst, conn->type,
705 conn->dst_type, status);
706
707 hci_connect_cfm(conn, status);
708
709 hci_conn_del(conn);
710
711 /* Since we may have temporarily stopped the background scanning in
712 * favor of connection establishment, we should restart it.
713 */
714 hci_update_background_scan(hdev);
715
716 /* Re-enable advertising in case this was a failed connection
717 * attempt as a peripheral.
718 */
719 hci_req_reenable_advertising(hdev);
720}
721
722static void create_le_conn_complete(struct hci_dev *hdev, u8 status, u16 opcode)
723{
724 struct hci_conn *conn;
725
726 hci_dev_lock(hdev);
727
728 conn = hci_lookup_le_connect(hdev);
729
730 if (!status) {
731 hci_connect_le_scan_cleanup(conn);
732 goto done;
733 }
734
735 bt_dev_err(hdev, "request failed to create LE connection: "
736 "status 0x%2.2x", status);
737
738 if (!conn)
739 goto done;
740
741 hci_le_conn_failed(conn, status);
742
743done:
744 hci_dev_unlock(hdev);
745}
746
747static bool conn_use_rpa(struct hci_conn *conn)
748{
749 struct hci_dev *hdev = conn->hdev;
750
751 return hci_dev_test_flag(hdev, HCI_PRIVACY);
752}
753
754static void set_ext_conn_params(struct hci_conn *conn,
755 struct hci_cp_le_ext_conn_param *p)
756{
757 struct hci_dev *hdev = conn->hdev;
758
759 memset(p, 0, sizeof(*p));
760
761 /* Set window to be the same value as the interval to
762 * enable continuous scanning.
763 */
764 p->scan_interval = cpu_to_le16(hdev->le_scan_interval);
765 p->scan_window = p->scan_interval;
766 p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
767 p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
768 p->conn_latency = cpu_to_le16(conn->le_conn_latency);
769 p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
770 p->min_ce_len = cpu_to_le16(0x0000);
771 p->max_ce_len = cpu_to_le16(0x0000);
772}
773
774static void hci_req_add_le_create_conn(struct hci_request *req,
775 struct hci_conn *conn,
776 bdaddr_t *direct_rpa)
777{
778 struct hci_dev *hdev = conn->hdev;
779 u8 own_addr_type;
780
781 /* If direct address was provided we use it instead of current
782 * address.
783 */
784 if (direct_rpa) {
785 if (bacmp(&req->hdev->random_addr, direct_rpa))
786 hci_req_add(req, HCI_OP_LE_SET_RANDOM_ADDR, 6,
787 direct_rpa);
788
789 /* direct address is always RPA */
790 own_addr_type = ADDR_LE_DEV_RANDOM;
791 } else {
792 /* Update random address, but set require_privacy to false so
793 * that we never connect with an non-resolvable address.
794 */
795 if (hci_update_random_address(req, false, conn_use_rpa(conn),
796 &own_addr_type))
797 return;
798 }
799
800 if (use_ext_conn(hdev)) {
801 struct hci_cp_le_ext_create_conn *cp;
802 struct hci_cp_le_ext_conn_param *p;
803 u8 data[sizeof(*cp) + sizeof(*p) * 3];
804 u32 plen;
805
806 cp = (void *) data;
807 p = (void *) cp->data;
808
809 memset(cp, 0, sizeof(*cp));
810
811 bacpy(&cp->peer_addr, &conn->dst);
812 cp->peer_addr_type = conn->dst_type;
813 cp->own_addr_type = own_addr_type;
814
815 plen = sizeof(*cp);
816
817 if (scan_1m(hdev)) {
818 cp->phys |= LE_SCAN_PHY_1M;
819 set_ext_conn_params(conn, p);
820
821 p++;
822 plen += sizeof(*p);
823 }
824
825 if (scan_2m(hdev)) {
826 cp->phys |= LE_SCAN_PHY_2M;
827 set_ext_conn_params(conn, p);
828
829 p++;
830 plen += sizeof(*p);
831 }
832
833 if (scan_coded(hdev)) {
834 cp->phys |= LE_SCAN_PHY_CODED;
835 set_ext_conn_params(conn, p);
836
837 plen += sizeof(*p);
838 }
839
840 hci_req_add(req, HCI_OP_LE_EXT_CREATE_CONN, plen, data);
841
842 } else {
843 struct hci_cp_le_create_conn cp;
844
845 memset(&cp, 0, sizeof(cp));
846
847 /* Set window to be the same value as the interval to enable
848 * continuous scanning.
849 */
850 cp.scan_interval = cpu_to_le16(hdev->le_scan_interval);
851 cp.scan_window = cp.scan_interval;
852
853 bacpy(&cp.peer_addr, &conn->dst);
854 cp.peer_addr_type = conn->dst_type;
855 cp.own_address_type = own_addr_type;
856 cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
857 cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
858 cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
859 cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
860 cp.min_ce_len = cpu_to_le16(0x0000);
861 cp.max_ce_len = cpu_to_le16(0x0000);
862
863 hci_req_add(req, HCI_OP_LE_CREATE_CONN, sizeof(cp), &cp);
864 }
865
866 conn->state = BT_CONNECT;
867 clear_bit(HCI_CONN_SCANNING, &conn->flags);
868}
869
870static void hci_req_directed_advertising(struct hci_request *req,
871 struct hci_conn *conn)
872{
873 struct hci_dev *hdev = req->hdev;
874 u8 own_addr_type;
875 u8 enable;
876
877 if (ext_adv_capable(hdev)) {
878 struct hci_cp_le_set_ext_adv_params cp;
879 bdaddr_t random_addr;
880
881 /* Set require_privacy to false so that the remote device has a
882 * chance of identifying us.
883 */
884 if (hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
885 &own_addr_type, &random_addr) < 0)
886 return;
887
888 memset(&cp, 0, sizeof(cp));
889
890 cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
891 cp.own_addr_type = own_addr_type;
892 cp.channel_map = hdev->le_adv_channel_map;
893 cp.tx_power = HCI_TX_POWER_INVALID;
894 cp.primary_phy = HCI_ADV_PHY_1M;
895 cp.secondary_phy = HCI_ADV_PHY_1M;
896 cp.handle = 0; /* Use instance 0 for directed adv */
897 cp.own_addr_type = own_addr_type;
898 cp.peer_addr_type = conn->dst_type;
899 bacpy(&cp.peer_addr, &conn->dst);
900
901 hci_req_add(req, HCI_OP_LE_SET_EXT_ADV_PARAMS, sizeof(cp), &cp);
902
903 if (own_addr_type == ADDR_LE_DEV_RANDOM &&
904 bacmp(&random_addr, BDADDR_ANY) &&
905 bacmp(&random_addr, &hdev->random_addr)) {
906 struct hci_cp_le_set_adv_set_rand_addr cp;
907
908 memset(&cp, 0, sizeof(cp));
909
910 cp.handle = 0;
911 bacpy(&cp.bdaddr, &random_addr);
912
913 hci_req_add(req,
914 HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
915 sizeof(cp), &cp);
916 }
917
918 __hci_req_enable_ext_advertising(req, 0x00);
919 } else {
920 struct hci_cp_le_set_adv_param cp;
921
922 /* Clear the HCI_LE_ADV bit temporarily so that the
923 * hci_update_random_address knows that it's safe to go ahead
924 * and write a new random address. The flag will be set back on
925 * as soon as the SET_ADV_ENABLE HCI command completes.
926 */
927 hci_dev_clear_flag(hdev, HCI_LE_ADV);
928
929 /* Set require_privacy to false so that the remote device has a
930 * chance of identifying us.
931 */
932 if (hci_update_random_address(req, false, conn_use_rpa(conn),
933 &own_addr_type) < 0)
934 return;
935
936 memset(&cp, 0, sizeof(cp));
937 cp.type = LE_ADV_DIRECT_IND;
938 cp.own_address_type = own_addr_type;
939 cp.direct_addr_type = conn->dst_type;
940 bacpy(&cp.direct_addr, &conn->dst);
941 cp.channel_map = hdev->le_adv_channel_map;
942
943 hci_req_add(req, HCI_OP_LE_SET_ADV_PARAM, sizeof(cp), &cp);
944
945 enable = 0x01;
946 hci_req_add(req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
947 &enable);
948 }
949
950 conn->state = BT_CONNECT;
951}
952
953struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
954 u8 dst_type, u8 sec_level, u16 conn_timeout,
955 u8 role, bdaddr_t *direct_rpa)
956{
957 struct hci_conn_params *params;
958 struct hci_conn *conn;
959 struct smp_irk *irk;
960 struct hci_request req;
961 int err;
962
963 /* Let's make sure that le is enabled.*/
964 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
965 if (lmp_le_capable(hdev))
966 return ERR_PTR(-ECONNREFUSED);
967
968 return ERR_PTR(-EOPNOTSUPP);
969 }
970
971 /* Since the controller supports only one LE connection attempt at a
972 * time, we return -EBUSY if there is any connection attempt running.
973 */
974 if (hci_lookup_le_connect(hdev))
975 return ERR_PTR(-EBUSY);
976
977 /* If there's already a connection object but it's not in
978 * scanning state it means it must already be established, in
979 * which case we can't do anything else except report a failure
980 * to connect.
981 */
982 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
983 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
984 return ERR_PTR(-EBUSY);
985 }
986
987 /* When given an identity address with existing identity
988 * resolving key, the connection needs to be established
989 * to a resolvable random address.
990 *
991 * Storing the resolvable random address is required here
992 * to handle connection failures. The address will later
993 * be resolved back into the original identity address
994 * from the connect request.
995 */
996 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
997 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
998 dst = &irk->rpa;
999 dst_type = ADDR_LE_DEV_RANDOM;
1000 }
1001
1002 if (conn) {
1003 bacpy(&conn->dst, dst);
1004 } else {
1005 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1006 if (!conn)
1007 return ERR_PTR(-ENOMEM);
1008 hci_conn_hold(conn);
1009 conn->pending_sec_level = sec_level;
1010 }
1011
1012 conn->dst_type = dst_type;
1013 conn->sec_level = BT_SECURITY_LOW;
1014 conn->conn_timeout = conn_timeout;
1015
1016 hci_req_init(&req, hdev);
1017
1018 /* Disable advertising if we're active. For master role
1019 * connections most controllers will refuse to connect if
1020 * advertising is enabled, and for slave role connections we
1021 * anyway have to disable it in order to start directed
1022 * advertising.
1023 */
1024 if (hci_dev_test_flag(hdev, HCI_LE_ADV)) {
1025 u8 enable = 0x00;
1026 hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
1027 &enable);
1028 }
1029
1030 /* If requested to connect as slave use directed advertising */
1031 if (conn->role == HCI_ROLE_SLAVE) {
1032 /* If we're active scanning most controllers are unable
1033 * to initiate advertising. Simply reject the attempt.
1034 */
1035 if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
1036 hdev->le_scan_type == LE_SCAN_ACTIVE) {
1037 hci_req_purge(&req);
1038 hci_conn_del(conn);
1039 return ERR_PTR(-EBUSY);
1040 }
1041
1042 hci_req_directed_advertising(&req, conn);
1043 goto create_conn;
1044 }
1045
1046 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
1047 if (params) {
1048 conn->le_conn_min_interval = params->conn_min_interval;
1049 conn->le_conn_max_interval = params->conn_max_interval;
1050 conn->le_conn_latency = params->conn_latency;
1051 conn->le_supv_timeout = params->supervision_timeout;
1052 } else {
1053 conn->le_conn_min_interval = hdev->le_conn_min_interval;
1054 conn->le_conn_max_interval = hdev->le_conn_max_interval;
1055 conn->le_conn_latency = hdev->le_conn_latency;
1056 conn->le_supv_timeout = hdev->le_supv_timeout;
1057 }
1058
1059 /* If controller is scanning, we stop it since some controllers are
1060 * not able to scan and connect at the same time. Also set the
1061 * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
1062 * handler for scan disabling knows to set the correct discovery
1063 * state.
1064 */
1065 if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
1066 hci_req_add_le_scan_disable(&req);
1067 hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
1068 }
1069
1070 hci_req_add_le_create_conn(&req, conn, direct_rpa);
1071
1072create_conn:
1073 err = hci_req_run(&req, create_le_conn_complete);
1074 if (err) {
1075 hci_conn_del(conn);
1076 return ERR_PTR(err);
1077 }
1078
1079 return conn;
1080}
1081
1082static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1083{
1084 struct hci_conn *conn;
1085
1086 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1087 if (!conn)
1088 return false;
1089
1090 if (conn->state != BT_CONNECTED)
1091 return false;
1092
1093 return true;
1094}
1095
1096/* This function requires the caller holds hdev->lock */
1097static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1098 bdaddr_t *addr, u8 addr_type)
1099{
1100 struct hci_conn_params *params;
1101
1102 if (is_connected(hdev, addr, addr_type))
1103 return -EISCONN;
1104
1105 params = hci_conn_params_lookup(hdev, addr, addr_type);
1106 if (!params) {
1107 params = hci_conn_params_add(hdev, addr, addr_type);
1108 if (!params)
1109 return -ENOMEM;
1110
1111 /* If we created new params, mark them to be deleted in
1112 * hci_connect_le_scan_cleanup. It's different case than
1113 * existing disabled params, those will stay after cleanup.
1114 */
1115 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1116 }
1117
1118 /* We're trying to connect, so make sure params are at pend_le_conns */
1119 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1120 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1121 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1122 list_del_init(¶ms->action);
1123 list_add(¶ms->action, &hdev->pend_le_conns);
1124 }
1125
1126 params->explicit_connect = true;
1127
1128 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1129 params->auto_connect);
1130
1131 return 0;
1132}
1133
1134/* This function requires the caller holds hdev->lock */
1135struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1136 u8 dst_type, u8 sec_level,
1137 u16 conn_timeout)
1138{
1139 struct hci_conn *conn;
1140
1141 /* Let's make sure that le is enabled.*/
1142 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1143 if (lmp_le_capable(hdev))
1144 return ERR_PTR(-ECONNREFUSED);
1145
1146 return ERR_PTR(-EOPNOTSUPP);
1147 }
1148
1149 /* Some devices send ATT messages as soon as the physical link is
1150 * established. To be able to handle these ATT messages, the user-
1151 * space first establishes the connection and then starts the pairing
1152 * process.
1153 *
1154 * So if a hci_conn object already exists for the following connection
1155 * attempt, we simply update pending_sec_level and auth_type fields
1156 * and return the object found.
1157 */
1158 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1159 if (conn) {
1160 if (conn->pending_sec_level < sec_level)
1161 conn->pending_sec_level = sec_level;
1162 goto done;
1163 }
1164
1165 BT_DBG("requesting refresh of dst_addr");
1166
1167 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1168 if (!conn)
1169 return ERR_PTR(-ENOMEM);
1170
1171 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0)
1172 return ERR_PTR(-EBUSY);
1173
1174 conn->state = BT_CONNECT;
1175 set_bit(HCI_CONN_SCANNING, &conn->flags);
1176 conn->dst_type = dst_type;
1177 conn->sec_level = BT_SECURITY_LOW;
1178 conn->pending_sec_level = sec_level;
1179 conn->conn_timeout = conn_timeout;
1180
1181 hci_update_background_scan(hdev);
1182
1183done:
1184 hci_conn_hold(conn);
1185 return conn;
1186}
1187
1188struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1189 u8 sec_level, u8 auth_type)
1190{
1191 struct hci_conn *acl;
1192
1193 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1194 if (lmp_bredr_capable(hdev))
1195 return ERR_PTR(-ECONNREFUSED);
1196
1197 return ERR_PTR(-EOPNOTSUPP);
1198 }
1199
1200 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1201 if (!acl) {
1202 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1203 if (!acl)
1204 return ERR_PTR(-ENOMEM);
1205 }
1206
1207 hci_conn_hold(acl);
1208
1209 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1210 acl->sec_level = BT_SECURITY_LOW;
1211 acl->pending_sec_level = sec_level;
1212 acl->auth_type = auth_type;
1213 hci_acl_create_connection(acl);
1214 }
1215
1216 return acl;
1217}
1218
1219struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1220 __u16 setting)
1221{
1222 struct hci_conn *acl;
1223 struct hci_conn *sco;
1224
1225 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING);
1226 if (IS_ERR(acl))
1227 return acl;
1228
1229 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1230 if (!sco) {
1231 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1232 if (!sco) {
1233 hci_conn_drop(acl);
1234 return ERR_PTR(-ENOMEM);
1235 }
1236 }
1237
1238 acl->link = sco;
1239 sco->link = acl;
1240
1241 hci_conn_hold(sco);
1242
1243 sco->setting = setting;
1244
1245 if (acl->state == BT_CONNECTED &&
1246 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1247 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1248 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1249
1250 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1251 /* defer SCO setup until mode change completed */
1252 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1253 return sco;
1254 }
1255
1256 hci_sco_setup(acl, 0x00);
1257 }
1258
1259 return sco;
1260}
1261
1262/* Check link security requirement */
1263int hci_conn_check_link_mode(struct hci_conn *conn)
1264{
1265 BT_DBG("hcon %p", conn);
1266
1267 /* In Secure Connections Only mode, it is required that Secure
1268 * Connections is used and the link is encrypted with AES-CCM
1269 * using a P-256 authenticated combination key.
1270 */
1271 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
1272 if (!hci_conn_sc_enabled(conn) ||
1273 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
1274 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
1275 return 0;
1276 }
1277
1278 if (hci_conn_ssp_enabled(conn) &&
1279 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1280 return 0;
1281
1282 return 1;
1283}
1284
1285/* Authenticate remote device */
1286static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
1287{
1288 BT_DBG("hcon %p", conn);
1289
1290 if (conn->pending_sec_level > sec_level)
1291 sec_level = conn->pending_sec_level;
1292
1293 if (sec_level > conn->sec_level)
1294 conn->pending_sec_level = sec_level;
1295 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
1296 return 1;
1297
1298 /* Make sure we preserve an existing MITM requirement*/
1299 auth_type |= (conn->auth_type & 0x01);
1300
1301 conn->auth_type = auth_type;
1302
1303 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
1304 struct hci_cp_auth_requested cp;
1305
1306 cp.handle = cpu_to_le16(conn->handle);
1307 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
1308 sizeof(cp), &cp);
1309
1310 /* If we're already encrypted set the REAUTH_PEND flag,
1311 * otherwise set the ENCRYPT_PEND.
1312 */
1313 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1314 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
1315 else
1316 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
1317 }
1318
1319 return 0;
1320}
1321
1322/* Encrypt the the link */
1323static void hci_conn_encrypt(struct hci_conn *conn)
1324{
1325 BT_DBG("hcon %p", conn);
1326
1327 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
1328 struct hci_cp_set_conn_encrypt cp;
1329 cp.handle = cpu_to_le16(conn->handle);
1330 cp.encrypt = 0x01;
1331 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
1332 &cp);
1333 }
1334}
1335
1336/* Enable security */
1337int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
1338 bool initiator)
1339{
1340 BT_DBG("hcon %p", conn);
1341
1342 if (conn->type == LE_LINK)
1343 return smp_conn_security(conn, sec_level);
1344
1345 /* For sdp we don't need the link key. */
1346 if (sec_level == BT_SECURITY_SDP)
1347 return 1;
1348
1349 /* For non 2.1 devices and low security level we don't need the link
1350 key. */
1351 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
1352 return 1;
1353
1354 /* For other security levels we need the link key. */
1355 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
1356 goto auth;
1357
1358 /* An authenticated FIPS approved combination key has sufficient
1359 * security for security level 4. */
1360 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
1361 sec_level == BT_SECURITY_FIPS)
1362 goto encrypt;
1363
1364 /* An authenticated combination key has sufficient security for
1365 security level 3. */
1366 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
1367 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
1368 sec_level == BT_SECURITY_HIGH)
1369 goto encrypt;
1370
1371 /* An unauthenticated combination key has sufficient security for
1372 security level 1 and 2. */
1373 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
1374 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
1375 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
1376 goto encrypt;
1377
1378 /* A combination key has always sufficient security for the security
1379 levels 1 or 2. High security level requires the combination key
1380 is generated using maximum PIN code length (16).
1381 For pre 2.1 units. */
1382 if (conn->key_type == HCI_LK_COMBINATION &&
1383 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
1384 conn->pin_length == 16))
1385 goto encrypt;
1386
1387auth:
1388 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
1389 return 0;
1390
1391 if (initiator)
1392 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
1393
1394 if (!hci_conn_auth(conn, sec_level, auth_type))
1395 return 0;
1396
1397encrypt:
1398 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
1399 /* Ensure that the encryption key size has been read,
1400 * otherwise stall the upper layer responses.
1401 */
1402 if (!conn->enc_key_size)
1403 return 0;
1404
1405 /* Nothing else needed, all requirements are met */
1406 return 1;
1407 }
1408
1409 hci_conn_encrypt(conn);
1410 return 0;
1411}
1412EXPORT_SYMBOL(hci_conn_security);
1413
1414/* Check secure link requirement */
1415int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
1416{
1417 BT_DBG("hcon %p", conn);
1418
1419 /* Accept if non-secure or higher security level is required */
1420 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
1421 return 1;
1422
1423 /* Accept if secure or higher security level is already present */
1424 if (conn->sec_level == BT_SECURITY_HIGH ||
1425 conn->sec_level == BT_SECURITY_FIPS)
1426 return 1;
1427
1428 /* Reject not secure link */
1429 return 0;
1430}
1431EXPORT_SYMBOL(hci_conn_check_secure);
1432
1433/* Switch role */
1434int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
1435{
1436 BT_DBG("hcon %p", conn);
1437
1438 if (role == conn->role)
1439 return 1;
1440
1441 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
1442 struct hci_cp_switch_role cp;
1443 bacpy(&cp.bdaddr, &conn->dst);
1444 cp.role = role;
1445 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
1446 }
1447
1448 return 0;
1449}
1450EXPORT_SYMBOL(hci_conn_switch_role);
1451
1452/* Enter active mode */
1453void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
1454{
1455 struct hci_dev *hdev = conn->hdev;
1456
1457 BT_DBG("hcon %p mode %d", conn, conn->mode);
1458
1459 if (conn->mode != HCI_CM_SNIFF)
1460 goto timer;
1461
1462 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
1463 goto timer;
1464
1465 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
1466 struct hci_cp_exit_sniff_mode cp;
1467 cp.handle = cpu_to_le16(conn->handle);
1468 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
1469 }
1470
1471timer:
1472 if (hdev->idle_timeout > 0)
1473 queue_delayed_work(hdev->workqueue, &conn->idle_work,
1474 msecs_to_jiffies(hdev->idle_timeout));
1475}
1476
1477/* Drop all connection on the device */
1478void hci_conn_hash_flush(struct hci_dev *hdev)
1479{
1480 struct hci_conn_hash *h = &hdev->conn_hash;
1481 struct hci_conn *c, *n;
1482
1483 BT_DBG("hdev %s", hdev->name);
1484
1485 list_for_each_entry_safe(c, n, &h->list, list) {
1486 c->state = BT_CLOSED;
1487
1488 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
1489 hci_conn_del(c);
1490 }
1491}
1492
1493/* Check pending connect attempts */
1494void hci_conn_check_pending(struct hci_dev *hdev)
1495{
1496 struct hci_conn *conn;
1497
1498 BT_DBG("hdev %s", hdev->name);
1499
1500 hci_dev_lock(hdev);
1501
1502 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
1503 if (conn)
1504 hci_acl_create_connection(conn);
1505
1506 hci_dev_unlock(hdev);
1507}
1508
1509static u32 get_link_mode(struct hci_conn *conn)
1510{
1511 u32 link_mode = 0;
1512
1513 if (conn->role == HCI_ROLE_MASTER)
1514 link_mode |= HCI_LM_MASTER;
1515
1516 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
1517 link_mode |= HCI_LM_ENCRYPT;
1518
1519 if (test_bit(HCI_CONN_AUTH, &conn->flags))
1520 link_mode |= HCI_LM_AUTH;
1521
1522 if (test_bit(HCI_CONN_SECURE, &conn->flags))
1523 link_mode |= HCI_LM_SECURE;
1524
1525 if (test_bit(HCI_CONN_FIPS, &conn->flags))
1526 link_mode |= HCI_LM_FIPS;
1527
1528 return link_mode;
1529}
1530
1531int hci_get_conn_list(void __user *arg)
1532{
1533 struct hci_conn *c;
1534 struct hci_conn_list_req req, *cl;
1535 struct hci_conn_info *ci;
1536 struct hci_dev *hdev;
1537 int n = 0, size, err;
1538
1539 if (copy_from_user(&req, arg, sizeof(req)))
1540 return -EFAULT;
1541
1542 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
1543 return -EINVAL;
1544
1545 size = sizeof(req) + req.conn_num * sizeof(*ci);
1546
1547 cl = kmalloc(size, GFP_KERNEL);
1548 if (!cl)
1549 return -ENOMEM;
1550
1551 hdev = hci_dev_get(req.dev_id);
1552 if (!hdev) {
1553 kfree(cl);
1554 return -ENODEV;
1555 }
1556
1557 ci = cl->conn_info;
1558
1559 hci_dev_lock(hdev);
1560 list_for_each_entry(c, &hdev->conn_hash.list, list) {
1561 bacpy(&(ci + n)->bdaddr, &c->dst);
1562 (ci + n)->handle = c->handle;
1563 (ci + n)->type = c->type;
1564 (ci + n)->out = c->out;
1565 (ci + n)->state = c->state;
1566 (ci + n)->link_mode = get_link_mode(c);
1567 if (++n >= req.conn_num)
1568 break;
1569 }
1570 hci_dev_unlock(hdev);
1571
1572 cl->dev_id = hdev->id;
1573 cl->conn_num = n;
1574 size = sizeof(req) + n * sizeof(*ci);
1575
1576 hci_dev_put(hdev);
1577
1578 err = copy_to_user(arg, cl, size);
1579 kfree(cl);
1580
1581 return err ? -EFAULT : 0;
1582}
1583
1584int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
1585{
1586 struct hci_conn_info_req req;
1587 struct hci_conn_info ci;
1588 struct hci_conn *conn;
1589 char __user *ptr = arg + sizeof(req);
1590
1591 if (copy_from_user(&req, arg, sizeof(req)))
1592 return -EFAULT;
1593
1594 hci_dev_lock(hdev);
1595 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
1596 if (conn) {
1597 bacpy(&ci.bdaddr, &conn->dst);
1598 ci.handle = conn->handle;
1599 ci.type = conn->type;
1600 ci.out = conn->out;
1601 ci.state = conn->state;
1602 ci.link_mode = get_link_mode(conn);
1603 }
1604 hci_dev_unlock(hdev);
1605
1606 if (!conn)
1607 return -ENOENT;
1608
1609 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
1610}
1611
1612int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
1613{
1614 struct hci_auth_info_req req;
1615 struct hci_conn *conn;
1616
1617 if (copy_from_user(&req, arg, sizeof(req)))
1618 return -EFAULT;
1619
1620 hci_dev_lock(hdev);
1621 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
1622 if (conn)
1623 req.type = conn->auth_type;
1624 hci_dev_unlock(hdev);
1625
1626 if (!conn)
1627 return -ENOENT;
1628
1629 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
1630}
1631
1632struct hci_chan *hci_chan_create(struct hci_conn *conn)
1633{
1634 struct hci_dev *hdev = conn->hdev;
1635 struct hci_chan *chan;
1636
1637 BT_DBG("%s hcon %p", hdev->name, conn);
1638
1639 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
1640 BT_DBG("Refusing to create new hci_chan");
1641 return NULL;
1642 }
1643
1644 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
1645 if (!chan)
1646 return NULL;
1647
1648 chan->conn = hci_conn_get(conn);
1649 skb_queue_head_init(&chan->data_q);
1650 chan->state = BT_CONNECTED;
1651
1652 list_add_rcu(&chan->list, &conn->chan_list);
1653
1654 return chan;
1655}
1656
1657void hci_chan_del(struct hci_chan *chan)
1658{
1659 struct hci_conn *conn = chan->conn;
1660 struct hci_dev *hdev = conn->hdev;
1661
1662 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
1663
1664 list_del_rcu(&chan->list);
1665
1666 synchronize_rcu();
1667
1668 /* Prevent new hci_chan's to be created for this hci_conn */
1669 set_bit(HCI_CONN_DROP, &conn->flags);
1670
1671 hci_conn_put(conn);
1672
1673 skb_queue_purge(&chan->data_q);
1674 kfree(chan);
1675}
1676
1677void hci_chan_list_flush(struct hci_conn *conn)
1678{
1679 struct hci_chan *chan, *n;
1680
1681 BT_DBG("hcon %p", conn);
1682
1683 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
1684 hci_chan_del(chan);
1685}
1686
1687static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
1688 __u16 handle)
1689{
1690 struct hci_chan *hchan;
1691
1692 list_for_each_entry(hchan, &hcon->chan_list, list) {
1693 if (hchan->handle == handle)
1694 return hchan;
1695 }
1696
1697 return NULL;
1698}
1699
1700struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
1701{
1702 struct hci_conn_hash *h = &hdev->conn_hash;
1703 struct hci_conn *hcon;
1704 struct hci_chan *hchan = NULL;
1705
1706 rcu_read_lock();
1707
1708 list_for_each_entry_rcu(hcon, &h->list, list) {
1709 hchan = __hci_chan_lookup_handle(hcon, handle);
1710 if (hchan)
1711 break;
1712 }
1713
1714 rcu_read_unlock();
1715
1716 return hchan;
1717}
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#include <net/bluetooth/iso.h>
34#include <net/bluetooth/mgmt.h>
35
36#include "hci_request.h"
37#include "smp.h"
38#include "a2mp.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 */
71static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
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 || !params->explicit_connect)
92 return;
93
94 /* The connection attempt was doing scan for new RPA, and is
95 * in scan phase. If params are not associated with any other
96 * autoconnect action, remove them completely. If they are, just unmark
97 * them as waiting for connection, by clearing explicit_connect field.
98 */
99 params->explicit_connect = false;
100
101 list_del_init(¶ms->action);
102
103 switch (params->auto_connect) {
104 case HCI_AUTO_CONN_EXPLICIT:
105 hci_conn_params_del(hdev, bdaddr, bdaddr_type);
106 /* return instead of break to avoid duplicate scan update */
107 return;
108 case HCI_AUTO_CONN_DIRECT:
109 case HCI_AUTO_CONN_ALWAYS:
110 list_add(¶ms->action, &hdev->pend_le_conns);
111 break;
112 case HCI_AUTO_CONN_REPORT:
113 list_add(¶ms->action, &hdev->pend_le_reports);
114 break;
115 default:
116 break;
117 }
118
119 hci_update_passive_scan(hdev);
120}
121
122static void hci_conn_cleanup(struct hci_conn *conn)
123{
124 struct hci_dev *hdev = conn->hdev;
125
126 if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
127 hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
128
129 if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
130 hci_remove_link_key(hdev, &conn->dst);
131
132 hci_chan_list_flush(conn);
133
134 hci_conn_hash_del(hdev, conn);
135
136 if (conn->cleanup)
137 conn->cleanup(conn);
138
139 if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
140 switch (conn->setting & SCO_AIRMODE_MASK) {
141 case SCO_AIRMODE_CVSD:
142 case SCO_AIRMODE_TRANSP:
143 if (hdev->notify)
144 hdev->notify(hdev, HCI_NOTIFY_DISABLE_SCO);
145 break;
146 }
147 } else {
148 if (hdev->notify)
149 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
150 }
151
152 hci_conn_del_sysfs(conn);
153
154 debugfs_remove_recursive(conn->debugfs);
155
156 hci_dev_put(hdev);
157
158 hci_conn_put(conn);
159}
160
161static void le_scan_cleanup(struct work_struct *work)
162{
163 struct hci_conn *conn = container_of(work, struct hci_conn,
164 le_scan_cleanup);
165 struct hci_dev *hdev = conn->hdev;
166 struct hci_conn *c = NULL;
167
168 BT_DBG("%s hcon %p", hdev->name, conn);
169
170 hci_dev_lock(hdev);
171
172 /* Check that the hci_conn is still around */
173 rcu_read_lock();
174 list_for_each_entry_rcu(c, &hdev->conn_hash.list, list) {
175 if (c == conn)
176 break;
177 }
178 rcu_read_unlock();
179
180 if (c == conn) {
181 hci_connect_le_scan_cleanup(conn);
182 hci_conn_cleanup(conn);
183 }
184
185 hci_dev_unlock(hdev);
186 hci_dev_put(hdev);
187 hci_conn_put(conn);
188}
189
190static void hci_connect_le_scan_remove(struct hci_conn *conn)
191{
192 BT_DBG("%s hcon %p", conn->hdev->name, conn);
193
194 /* We can't call hci_conn_del/hci_conn_cleanup here since that
195 * could deadlock with another hci_conn_del() call that's holding
196 * hci_dev_lock and doing cancel_delayed_work_sync(&conn->disc_work).
197 * Instead, grab temporary extra references to the hci_dev and
198 * hci_conn and perform the necessary cleanup in a separate work
199 * callback.
200 */
201
202 hci_dev_hold(conn->hdev);
203 hci_conn_get(conn);
204
205 /* Even though we hold a reference to the hdev, many other
206 * things might get cleaned up meanwhile, including the hdev's
207 * own workqueue, so we can't use that for scheduling.
208 */
209 schedule_work(&conn->le_scan_cleanup);
210}
211
212static void hci_acl_create_connection(struct hci_conn *conn)
213{
214 struct hci_dev *hdev = conn->hdev;
215 struct inquiry_entry *ie;
216 struct hci_cp_create_conn cp;
217
218 BT_DBG("hcon %p", conn);
219
220 /* Many controllers disallow HCI Create Connection while it is doing
221 * HCI Inquiry. So we cancel the Inquiry first before issuing HCI Create
222 * Connection. This may cause the MGMT discovering state to become false
223 * without user space's request but it is okay since the MGMT Discovery
224 * APIs do not promise that discovery should be done forever. Instead,
225 * the user space monitors the status of MGMT discovering and it may
226 * request for discovery again when this flag becomes false.
227 */
228 if (test_bit(HCI_INQUIRY, &hdev->flags)) {
229 /* Put this connection to "pending" state so that it will be
230 * executed after the inquiry cancel command complete event.
231 */
232 conn->state = BT_CONNECT2;
233 hci_send_cmd(hdev, HCI_OP_INQUIRY_CANCEL, 0, NULL);
234 return;
235 }
236
237 conn->state = BT_CONNECT;
238 conn->out = true;
239 conn->role = HCI_ROLE_MASTER;
240
241 conn->attempt++;
242
243 conn->link_policy = hdev->link_policy;
244
245 memset(&cp, 0, sizeof(cp));
246 bacpy(&cp.bdaddr, &conn->dst);
247 cp.pscan_rep_mode = 0x02;
248
249 ie = hci_inquiry_cache_lookup(hdev, &conn->dst);
250 if (ie) {
251 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
252 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
253 cp.pscan_mode = ie->data.pscan_mode;
254 cp.clock_offset = ie->data.clock_offset |
255 cpu_to_le16(0x8000);
256 }
257
258 memcpy(conn->dev_class, ie->data.dev_class, 3);
259 }
260
261 cp.pkt_type = cpu_to_le16(conn->pkt_type);
262 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
263 cp.role_switch = 0x01;
264 else
265 cp.role_switch = 0x00;
266
267 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
268}
269
270int hci_disconnect(struct hci_conn *conn, __u8 reason)
271{
272 BT_DBG("hcon %p", conn);
273
274 /* When we are central of an established connection and it enters
275 * the disconnect timeout, then go ahead and try to read the
276 * current clock offset. Processing of the result is done
277 * within the event handling and hci_clock_offset_evt function.
278 */
279 if (conn->type == ACL_LINK && conn->role == HCI_ROLE_MASTER &&
280 (conn->state == BT_CONNECTED || conn->state == BT_CONFIG)) {
281 struct hci_dev *hdev = conn->hdev;
282 struct hci_cp_read_clock_offset clkoff_cp;
283
284 clkoff_cp.handle = cpu_to_le16(conn->handle);
285 hci_send_cmd(hdev, HCI_OP_READ_CLOCK_OFFSET, sizeof(clkoff_cp),
286 &clkoff_cp);
287 }
288
289 return hci_abort_conn(conn, reason);
290}
291
292static void hci_add_sco(struct hci_conn *conn, __u16 handle)
293{
294 struct hci_dev *hdev = conn->hdev;
295 struct hci_cp_add_sco cp;
296
297 BT_DBG("hcon %p", conn);
298
299 conn->state = BT_CONNECT;
300 conn->out = true;
301
302 conn->attempt++;
303
304 cp.handle = cpu_to_le16(handle);
305 cp.pkt_type = cpu_to_le16(conn->pkt_type);
306
307 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
308}
309
310static bool find_next_esco_param(struct hci_conn *conn,
311 const struct sco_param *esco_param, int size)
312{
313 for (; conn->attempt <= size; conn->attempt++) {
314 if (lmp_esco_2m_capable(conn->link) ||
315 (esco_param[conn->attempt - 1].pkt_type & ESCO_2EV3))
316 break;
317 BT_DBG("hcon %p skipped attempt %d, eSCO 2M not supported",
318 conn, conn->attempt);
319 }
320
321 return conn->attempt <= size;
322}
323
324static int configure_datapath_sync(struct hci_dev *hdev, struct bt_codec *codec)
325{
326 int err;
327 __u8 vnd_len, *vnd_data = NULL;
328 struct hci_op_configure_data_path *cmd = NULL;
329
330 err = hdev->get_codec_config_data(hdev, ESCO_LINK, codec, &vnd_len,
331 &vnd_data);
332 if (err < 0)
333 goto error;
334
335 cmd = kzalloc(sizeof(*cmd) + vnd_len, GFP_KERNEL);
336 if (!cmd) {
337 err = -ENOMEM;
338 goto error;
339 }
340
341 err = hdev->get_data_path_id(hdev, &cmd->data_path_id);
342 if (err < 0)
343 goto error;
344
345 cmd->vnd_len = vnd_len;
346 memcpy(cmd->vnd_data, vnd_data, vnd_len);
347
348 cmd->direction = 0x00;
349 __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
350 sizeof(*cmd) + vnd_len, cmd, HCI_CMD_TIMEOUT);
351
352 cmd->direction = 0x01;
353 err = __hci_cmd_sync_status(hdev, HCI_CONFIGURE_DATA_PATH,
354 sizeof(*cmd) + vnd_len, cmd,
355 HCI_CMD_TIMEOUT);
356error:
357
358 kfree(cmd);
359 kfree(vnd_data);
360 return err;
361}
362
363static int hci_enhanced_setup_sync(struct hci_dev *hdev, void *data)
364{
365 struct conn_handle_t *conn_handle = data;
366 struct hci_conn *conn = conn_handle->conn;
367 __u16 handle = conn_handle->handle;
368 struct hci_cp_enhanced_setup_sync_conn cp;
369 const struct sco_param *param;
370
371 kfree(conn_handle);
372
373 bt_dev_dbg(hdev, "hcon %p", conn);
374
375 /* for offload use case, codec needs to configured before opening SCO */
376 if (conn->codec.data_path)
377 configure_datapath_sync(hdev, &conn->codec);
378
379 conn->state = BT_CONNECT;
380 conn->out = true;
381
382 conn->attempt++;
383
384 memset(&cp, 0x00, sizeof(cp));
385
386 cp.handle = cpu_to_le16(handle);
387
388 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
389 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
390
391 switch (conn->codec.id) {
392 case BT_CODEC_MSBC:
393 if (!find_next_esco_param(conn, esco_param_msbc,
394 ARRAY_SIZE(esco_param_msbc)))
395 return -EINVAL;
396
397 param = &esco_param_msbc[conn->attempt - 1];
398 cp.tx_coding_format.id = 0x05;
399 cp.rx_coding_format.id = 0x05;
400 cp.tx_codec_frame_size = __cpu_to_le16(60);
401 cp.rx_codec_frame_size = __cpu_to_le16(60);
402 cp.in_bandwidth = __cpu_to_le32(32000);
403 cp.out_bandwidth = __cpu_to_le32(32000);
404 cp.in_coding_format.id = 0x04;
405 cp.out_coding_format.id = 0x04;
406 cp.in_coded_data_size = __cpu_to_le16(16);
407 cp.out_coded_data_size = __cpu_to_le16(16);
408 cp.in_pcm_data_format = 2;
409 cp.out_pcm_data_format = 2;
410 cp.in_pcm_sample_payload_msb_pos = 0;
411 cp.out_pcm_sample_payload_msb_pos = 0;
412 cp.in_data_path = conn->codec.data_path;
413 cp.out_data_path = conn->codec.data_path;
414 cp.in_transport_unit_size = 1;
415 cp.out_transport_unit_size = 1;
416 break;
417
418 case BT_CODEC_TRANSPARENT:
419 if (!find_next_esco_param(conn, esco_param_msbc,
420 ARRAY_SIZE(esco_param_msbc)))
421 return false;
422 param = &esco_param_msbc[conn->attempt - 1];
423 cp.tx_coding_format.id = 0x03;
424 cp.rx_coding_format.id = 0x03;
425 cp.tx_codec_frame_size = __cpu_to_le16(60);
426 cp.rx_codec_frame_size = __cpu_to_le16(60);
427 cp.in_bandwidth = __cpu_to_le32(0x1f40);
428 cp.out_bandwidth = __cpu_to_le32(0x1f40);
429 cp.in_coding_format.id = 0x03;
430 cp.out_coding_format.id = 0x03;
431 cp.in_coded_data_size = __cpu_to_le16(16);
432 cp.out_coded_data_size = __cpu_to_le16(16);
433 cp.in_pcm_data_format = 2;
434 cp.out_pcm_data_format = 2;
435 cp.in_pcm_sample_payload_msb_pos = 0;
436 cp.out_pcm_sample_payload_msb_pos = 0;
437 cp.in_data_path = conn->codec.data_path;
438 cp.out_data_path = conn->codec.data_path;
439 cp.in_transport_unit_size = 1;
440 cp.out_transport_unit_size = 1;
441 break;
442
443 case BT_CODEC_CVSD:
444 if (lmp_esco_capable(conn->link)) {
445 if (!find_next_esco_param(conn, esco_param_cvsd,
446 ARRAY_SIZE(esco_param_cvsd)))
447 return -EINVAL;
448 param = &esco_param_cvsd[conn->attempt - 1];
449 } else {
450 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
451 return -EINVAL;
452 param = &sco_param_cvsd[conn->attempt - 1];
453 }
454 cp.tx_coding_format.id = 2;
455 cp.rx_coding_format.id = 2;
456 cp.tx_codec_frame_size = __cpu_to_le16(60);
457 cp.rx_codec_frame_size = __cpu_to_le16(60);
458 cp.in_bandwidth = __cpu_to_le32(16000);
459 cp.out_bandwidth = __cpu_to_le32(16000);
460 cp.in_coding_format.id = 4;
461 cp.out_coding_format.id = 4;
462 cp.in_coded_data_size = __cpu_to_le16(16);
463 cp.out_coded_data_size = __cpu_to_le16(16);
464 cp.in_pcm_data_format = 2;
465 cp.out_pcm_data_format = 2;
466 cp.in_pcm_sample_payload_msb_pos = 0;
467 cp.out_pcm_sample_payload_msb_pos = 0;
468 cp.in_data_path = conn->codec.data_path;
469 cp.out_data_path = conn->codec.data_path;
470 cp.in_transport_unit_size = 16;
471 cp.out_transport_unit_size = 16;
472 break;
473 default:
474 return -EINVAL;
475 }
476
477 cp.retrans_effort = param->retrans_effort;
478 cp.pkt_type = __cpu_to_le16(param->pkt_type);
479 cp.max_latency = __cpu_to_le16(param->max_latency);
480
481 if (hci_send_cmd(hdev, HCI_OP_ENHANCED_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
482 return -EIO;
483
484 return 0;
485}
486
487static bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
488{
489 struct hci_dev *hdev = conn->hdev;
490 struct hci_cp_setup_sync_conn cp;
491 const struct sco_param *param;
492
493 bt_dev_dbg(hdev, "hcon %p", conn);
494
495 conn->state = BT_CONNECT;
496 conn->out = true;
497
498 conn->attempt++;
499
500 cp.handle = cpu_to_le16(handle);
501
502 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
503 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
504 cp.voice_setting = cpu_to_le16(conn->setting);
505
506 switch (conn->setting & SCO_AIRMODE_MASK) {
507 case SCO_AIRMODE_TRANSP:
508 if (!find_next_esco_param(conn, esco_param_msbc,
509 ARRAY_SIZE(esco_param_msbc)))
510 return false;
511 param = &esco_param_msbc[conn->attempt - 1];
512 break;
513 case SCO_AIRMODE_CVSD:
514 if (lmp_esco_capable(conn->link)) {
515 if (!find_next_esco_param(conn, esco_param_cvsd,
516 ARRAY_SIZE(esco_param_cvsd)))
517 return false;
518 param = &esco_param_cvsd[conn->attempt - 1];
519 } else {
520 if (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
521 return false;
522 param = &sco_param_cvsd[conn->attempt - 1];
523 }
524 break;
525 default:
526 return false;
527 }
528
529 cp.retrans_effort = param->retrans_effort;
530 cp.pkt_type = __cpu_to_le16(param->pkt_type);
531 cp.max_latency = __cpu_to_le16(param->max_latency);
532
533 if (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
534 return false;
535
536 return true;
537}
538
539bool hci_setup_sync(struct hci_conn *conn, __u16 handle)
540{
541 int result;
542 struct conn_handle_t *conn_handle;
543
544 if (enhanced_sync_conn_capable(conn->hdev)) {
545 conn_handle = kzalloc(sizeof(*conn_handle), GFP_KERNEL);
546
547 if (!conn_handle)
548 return false;
549
550 conn_handle->conn = conn;
551 conn_handle->handle = handle;
552 result = hci_cmd_sync_queue(conn->hdev, hci_enhanced_setup_sync,
553 conn_handle, NULL);
554 if (result < 0)
555 kfree(conn_handle);
556
557 return result == 0;
558 }
559
560 return hci_setup_sync_conn(conn, handle);
561}
562
563u8 hci_le_conn_update(struct hci_conn *conn, u16 min, u16 max, u16 latency,
564 u16 to_multiplier)
565{
566 struct hci_dev *hdev = conn->hdev;
567 struct hci_conn_params *params;
568 struct hci_cp_le_conn_update cp;
569
570 hci_dev_lock(hdev);
571
572 params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
573 if (params) {
574 params->conn_min_interval = min;
575 params->conn_max_interval = max;
576 params->conn_latency = latency;
577 params->supervision_timeout = to_multiplier;
578 }
579
580 hci_dev_unlock(hdev);
581
582 memset(&cp, 0, sizeof(cp));
583 cp.handle = cpu_to_le16(conn->handle);
584 cp.conn_interval_min = cpu_to_le16(min);
585 cp.conn_interval_max = cpu_to_le16(max);
586 cp.conn_latency = cpu_to_le16(latency);
587 cp.supervision_timeout = cpu_to_le16(to_multiplier);
588 cp.min_ce_len = cpu_to_le16(0x0000);
589 cp.max_ce_len = cpu_to_le16(0x0000);
590
591 hci_send_cmd(hdev, HCI_OP_LE_CONN_UPDATE, sizeof(cp), &cp);
592
593 if (params)
594 return 0x01;
595
596 return 0x00;
597}
598
599void hci_le_start_enc(struct hci_conn *conn, __le16 ediv, __le64 rand,
600 __u8 ltk[16], __u8 key_size)
601{
602 struct hci_dev *hdev = conn->hdev;
603 struct hci_cp_le_start_enc cp;
604
605 BT_DBG("hcon %p", conn);
606
607 memset(&cp, 0, sizeof(cp));
608
609 cp.handle = cpu_to_le16(conn->handle);
610 cp.rand = rand;
611 cp.ediv = ediv;
612 memcpy(cp.ltk, ltk, key_size);
613
614 hci_send_cmd(hdev, HCI_OP_LE_START_ENC, sizeof(cp), &cp);
615}
616
617/* Device _must_ be locked */
618void hci_sco_setup(struct hci_conn *conn, __u8 status)
619{
620 struct hci_conn *sco = conn->link;
621
622 if (!sco)
623 return;
624
625 BT_DBG("hcon %p", conn);
626
627 if (!status) {
628 if (lmp_esco_capable(conn->hdev))
629 hci_setup_sync(sco, conn->handle);
630 else
631 hci_add_sco(sco, conn->handle);
632 } else {
633 hci_connect_cfm(sco, status);
634 hci_conn_del(sco);
635 }
636}
637
638static void hci_conn_timeout(struct work_struct *work)
639{
640 struct hci_conn *conn = container_of(work, struct hci_conn,
641 disc_work.work);
642 int refcnt = atomic_read(&conn->refcnt);
643
644 BT_DBG("hcon %p state %s", conn, state_to_string(conn->state));
645
646 WARN_ON(refcnt < 0);
647
648 /* FIXME: It was observed that in pairing failed scenario, refcnt
649 * drops below 0. Probably this is because l2cap_conn_del calls
650 * l2cap_chan_del for each channel, and inside l2cap_chan_del conn is
651 * dropped. After that loop hci_chan_del is called which also drops
652 * conn. For now make sure that ACL is alive if refcnt is higher then 0,
653 * otherwise drop it.
654 */
655 if (refcnt > 0)
656 return;
657
658 /* LE connections in scanning state need special handling */
659 if (conn->state == BT_CONNECT && conn->type == LE_LINK &&
660 test_bit(HCI_CONN_SCANNING, &conn->flags)) {
661 hci_connect_le_scan_remove(conn);
662 return;
663 }
664
665 hci_abort_conn(conn, hci_proto_disconn_ind(conn));
666}
667
668/* Enter sniff mode */
669static void hci_conn_idle(struct work_struct *work)
670{
671 struct hci_conn *conn = container_of(work, struct hci_conn,
672 idle_work.work);
673 struct hci_dev *hdev = conn->hdev;
674
675 BT_DBG("hcon %p mode %d", conn, conn->mode);
676
677 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
678 return;
679
680 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
681 return;
682
683 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
684 struct hci_cp_sniff_subrate cp;
685 cp.handle = cpu_to_le16(conn->handle);
686 cp.max_latency = cpu_to_le16(0);
687 cp.min_remote_timeout = cpu_to_le16(0);
688 cp.min_local_timeout = cpu_to_le16(0);
689 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
690 }
691
692 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
693 struct hci_cp_sniff_mode cp;
694 cp.handle = cpu_to_le16(conn->handle);
695 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
696 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
697 cp.attempt = cpu_to_le16(4);
698 cp.timeout = cpu_to_le16(1);
699 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
700 }
701}
702
703static void hci_conn_auto_accept(struct work_struct *work)
704{
705 struct hci_conn *conn = container_of(work, struct hci_conn,
706 auto_accept_work.work);
707
708 hci_send_cmd(conn->hdev, HCI_OP_USER_CONFIRM_REPLY, sizeof(conn->dst),
709 &conn->dst);
710}
711
712static void le_disable_advertising(struct hci_dev *hdev)
713{
714 if (ext_adv_capable(hdev)) {
715 struct hci_cp_le_set_ext_adv_enable cp;
716
717 cp.enable = 0x00;
718 cp.num_of_sets = 0x00;
719
720 hci_send_cmd(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE, sizeof(cp),
721 &cp);
722 } else {
723 u8 enable = 0x00;
724 hci_send_cmd(hdev, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable),
725 &enable);
726 }
727}
728
729static void le_conn_timeout(struct work_struct *work)
730{
731 struct hci_conn *conn = container_of(work, struct hci_conn,
732 le_conn_timeout.work);
733 struct hci_dev *hdev = conn->hdev;
734
735 BT_DBG("");
736
737 /* We could end up here due to having done directed advertising,
738 * so clean up the state if necessary. This should however only
739 * happen with broken hardware or if low duty cycle was used
740 * (which doesn't have a timeout of its own).
741 */
742 if (conn->role == HCI_ROLE_SLAVE) {
743 /* Disable LE Advertising */
744 le_disable_advertising(hdev);
745 hci_dev_lock(hdev);
746 hci_conn_failed(conn, HCI_ERROR_ADVERTISING_TIMEOUT);
747 hci_dev_unlock(hdev);
748 return;
749 }
750
751 hci_abort_conn(conn, HCI_ERROR_REMOTE_USER_TERM);
752}
753
754struct iso_list_data {
755 union {
756 u8 cig;
757 u8 big;
758 };
759 union {
760 u8 cis;
761 u8 bis;
762 u16 sync_handle;
763 };
764 int count;
765 struct {
766 struct hci_cp_le_set_cig_params cp;
767 struct hci_cis_params cis[0x11];
768 } pdu;
769};
770
771static void bis_list(struct hci_conn *conn, void *data)
772{
773 struct iso_list_data *d = data;
774
775 /* Skip if not broadcast/ANY address */
776 if (bacmp(&conn->dst, BDADDR_ANY))
777 return;
778
779 if (d->big != conn->iso_qos.big || d->bis == BT_ISO_QOS_BIS_UNSET ||
780 d->bis != conn->iso_qos.bis)
781 return;
782
783 d->count++;
784}
785
786static void find_bis(struct hci_conn *conn, void *data)
787{
788 struct iso_list_data *d = data;
789
790 /* Ignore unicast */
791 if (bacmp(&conn->dst, BDADDR_ANY))
792 return;
793
794 d->count++;
795}
796
797static int terminate_big_sync(struct hci_dev *hdev, void *data)
798{
799 struct iso_list_data *d = data;
800
801 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", d->big, d->bis);
802
803 hci_remove_ext_adv_instance_sync(hdev, d->bis, NULL);
804
805 /* Check if ISO connection is a BIS and terminate BIG if there are
806 * no other connections using it.
807 */
808 hci_conn_hash_list_state(hdev, find_bis, ISO_LINK, BT_CONNECTED, d);
809 if (d->count)
810 return 0;
811
812 return hci_le_terminate_big_sync(hdev, d->big,
813 HCI_ERROR_LOCAL_HOST_TERM);
814}
815
816static void terminate_big_destroy(struct hci_dev *hdev, void *data, int err)
817{
818 kfree(data);
819}
820
821static int hci_le_terminate_big(struct hci_dev *hdev, u8 big, u8 bis)
822{
823 struct iso_list_data *d;
824 int ret;
825
826 bt_dev_dbg(hdev, "big 0x%2.2x bis 0x%2.2x", big, bis);
827
828 d = kzalloc(sizeof(*d), GFP_KERNEL);
829 if (!d)
830 return -ENOMEM;
831
832 d->big = big;
833 d->bis = bis;
834
835 ret = hci_cmd_sync_queue(hdev, terminate_big_sync, d,
836 terminate_big_destroy);
837 if (ret)
838 kfree(d);
839
840 return ret;
841}
842
843static int big_terminate_sync(struct hci_dev *hdev, void *data)
844{
845 struct iso_list_data *d = data;
846
847 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", d->big,
848 d->sync_handle);
849
850 /* Check if ISO connection is a BIS and terminate BIG if there are
851 * no other connections using it.
852 */
853 hci_conn_hash_list_state(hdev, find_bis, ISO_LINK, BT_CONNECTED, d);
854 if (d->count)
855 return 0;
856
857 hci_le_big_terminate_sync(hdev, d->big);
858
859 return hci_le_pa_terminate_sync(hdev, d->sync_handle);
860}
861
862static int hci_le_big_terminate(struct hci_dev *hdev, u8 big, u16 sync_handle)
863{
864 struct iso_list_data *d;
865 int ret;
866
867 bt_dev_dbg(hdev, "big 0x%2.2x sync_handle 0x%4.4x", big, sync_handle);
868
869 d = kzalloc(sizeof(*d), GFP_KERNEL);
870 if (!d)
871 return -ENOMEM;
872
873 d->big = big;
874 d->sync_handle = sync_handle;
875
876 ret = hci_cmd_sync_queue(hdev, big_terminate_sync, d,
877 terminate_big_destroy);
878 if (ret)
879 kfree(d);
880
881 return ret;
882}
883
884/* Cleanup BIS connection
885 *
886 * Detects if there any BIS left connected in a BIG
887 * broadcaster: Remove advertising instance and terminate BIG.
888 * broadcaster receiver: Teminate BIG sync and terminate PA sync.
889 */
890static void bis_cleanup(struct hci_conn *conn)
891{
892 struct hci_dev *hdev = conn->hdev;
893
894 bt_dev_dbg(hdev, "conn %p", conn);
895
896 if (conn->role == HCI_ROLE_MASTER) {
897 if (!test_and_clear_bit(HCI_CONN_PER_ADV, &conn->flags))
898 return;
899
900 hci_le_terminate_big(hdev, conn->iso_qos.big,
901 conn->iso_qos.bis);
902 } else {
903 hci_le_big_terminate(hdev, conn->iso_qos.big,
904 conn->sync_handle);
905 }
906}
907
908static int remove_cig_sync(struct hci_dev *hdev, void *data)
909{
910 u8 handle = PTR_ERR(data);
911
912 return hci_le_remove_cig_sync(hdev, handle);
913}
914
915static int hci_le_remove_cig(struct hci_dev *hdev, u8 handle)
916{
917 bt_dev_dbg(hdev, "handle 0x%2.2x", handle);
918
919 return hci_cmd_sync_queue(hdev, remove_cig_sync, ERR_PTR(handle), NULL);
920}
921
922static void find_cis(struct hci_conn *conn, void *data)
923{
924 struct iso_list_data *d = data;
925
926 /* Ignore broadcast */
927 if (!bacmp(&conn->dst, BDADDR_ANY))
928 return;
929
930 d->count++;
931}
932
933/* Cleanup CIS connection:
934 *
935 * Detects if there any CIS left connected in a CIG and remove it.
936 */
937static void cis_cleanup(struct hci_conn *conn)
938{
939 struct hci_dev *hdev = conn->hdev;
940 struct iso_list_data d;
941
942 memset(&d, 0, sizeof(d));
943 d.cig = conn->iso_qos.cig;
944
945 /* Check if ISO connection is a CIS and remove CIG if there are
946 * no other connections using it.
947 */
948 hci_conn_hash_list_state(hdev, find_cis, ISO_LINK, BT_CONNECTED, &d);
949 if (d.count)
950 return;
951
952 hci_le_remove_cig(hdev, conn->iso_qos.cig);
953}
954
955struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst,
956 u8 role)
957{
958 struct hci_conn *conn;
959
960 BT_DBG("%s dst %pMR", hdev->name, dst);
961
962 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
963 if (!conn)
964 return NULL;
965
966 bacpy(&conn->dst, dst);
967 bacpy(&conn->src, &hdev->bdaddr);
968 conn->handle = HCI_CONN_HANDLE_UNSET;
969 conn->hdev = hdev;
970 conn->type = type;
971 conn->role = role;
972 conn->mode = HCI_CM_ACTIVE;
973 conn->state = BT_OPEN;
974 conn->auth_type = HCI_AT_GENERAL_BONDING;
975 conn->io_capability = hdev->io_capability;
976 conn->remote_auth = 0xff;
977 conn->key_type = 0xff;
978 conn->rssi = HCI_RSSI_INVALID;
979 conn->tx_power = HCI_TX_POWER_INVALID;
980 conn->max_tx_power = HCI_TX_POWER_INVALID;
981
982 set_bit(HCI_CONN_POWER_SAVE, &conn->flags);
983 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
984
985 /* Set Default Authenticated payload timeout to 30s */
986 conn->auth_payload_timeout = DEFAULT_AUTH_PAYLOAD_TIMEOUT;
987
988 if (conn->role == HCI_ROLE_MASTER)
989 conn->out = true;
990
991 switch (type) {
992 case ACL_LINK:
993 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
994 break;
995 case LE_LINK:
996 /* conn->src should reflect the local identity address */
997 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
998 break;
999 case ISO_LINK:
1000 /* conn->src should reflect the local identity address */
1001 hci_copy_identity_address(hdev, &conn->src, &conn->src_type);
1002
1003 /* set proper cleanup function */
1004 if (!bacmp(dst, BDADDR_ANY))
1005 conn->cleanup = bis_cleanup;
1006 else if (conn->role == HCI_ROLE_MASTER)
1007 conn->cleanup = cis_cleanup;
1008
1009 break;
1010 case SCO_LINK:
1011 if (lmp_esco_capable(hdev))
1012 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
1013 (hdev->esco_type & EDR_ESCO_MASK);
1014 else
1015 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
1016 break;
1017 case ESCO_LINK:
1018 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
1019 break;
1020 }
1021
1022 skb_queue_head_init(&conn->data_q);
1023
1024 INIT_LIST_HEAD(&conn->chan_list);
1025
1026 INIT_DELAYED_WORK(&conn->disc_work, hci_conn_timeout);
1027 INIT_DELAYED_WORK(&conn->auto_accept_work, hci_conn_auto_accept);
1028 INIT_DELAYED_WORK(&conn->idle_work, hci_conn_idle);
1029 INIT_DELAYED_WORK(&conn->le_conn_timeout, le_conn_timeout);
1030 INIT_WORK(&conn->le_scan_cleanup, le_scan_cleanup);
1031
1032 atomic_set(&conn->refcnt, 0);
1033
1034 hci_dev_hold(hdev);
1035
1036 hci_conn_hash_add(hdev, conn);
1037
1038 /* The SCO and eSCO connections will only be notified when their
1039 * setup has been completed. This is different to ACL links which
1040 * can be notified right away.
1041 */
1042 if (conn->type != SCO_LINK && conn->type != ESCO_LINK) {
1043 if (hdev->notify)
1044 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
1045 }
1046
1047 hci_conn_init_sysfs(conn);
1048
1049 return conn;
1050}
1051
1052int hci_conn_del(struct hci_conn *conn)
1053{
1054 struct hci_dev *hdev = conn->hdev;
1055
1056 BT_DBG("%s hcon %p handle %d", hdev->name, conn, conn->handle);
1057
1058 cancel_delayed_work_sync(&conn->disc_work);
1059 cancel_delayed_work_sync(&conn->auto_accept_work);
1060 cancel_delayed_work_sync(&conn->idle_work);
1061
1062 if (conn->type == ACL_LINK) {
1063 struct hci_conn *sco = conn->link;
1064 if (sco)
1065 sco->link = NULL;
1066
1067 /* Unacked frames */
1068 hdev->acl_cnt += conn->sent;
1069 } else if (conn->type == LE_LINK) {
1070 cancel_delayed_work(&conn->le_conn_timeout);
1071
1072 if (hdev->le_pkts)
1073 hdev->le_cnt += conn->sent;
1074 else
1075 hdev->acl_cnt += conn->sent;
1076 } else {
1077 struct hci_conn *acl = conn->link;
1078
1079 if (acl) {
1080 acl->link = NULL;
1081 hci_conn_drop(acl);
1082 }
1083
1084 /* Unacked ISO frames */
1085 if (conn->type == ISO_LINK) {
1086 if (hdev->iso_pkts)
1087 hdev->iso_cnt += conn->sent;
1088 else if (hdev->le_pkts)
1089 hdev->le_cnt += conn->sent;
1090 else
1091 hdev->acl_cnt += conn->sent;
1092 }
1093 }
1094
1095 if (conn->amp_mgr)
1096 amp_mgr_put(conn->amp_mgr);
1097
1098 skb_queue_purge(&conn->data_q);
1099
1100 /* Remove the connection from the list and cleanup its remaining
1101 * state. This is a separate function since for some cases like
1102 * BT_CONNECT_SCAN we *only* want the cleanup part without the
1103 * rest of hci_conn_del.
1104 */
1105 hci_conn_cleanup(conn);
1106
1107 return 0;
1108}
1109
1110struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src, uint8_t src_type)
1111{
1112 int use_src = bacmp(src, BDADDR_ANY);
1113 struct hci_dev *hdev = NULL, *d;
1114
1115 BT_DBG("%pMR -> %pMR", src, dst);
1116
1117 read_lock(&hci_dev_list_lock);
1118
1119 list_for_each_entry(d, &hci_dev_list, list) {
1120 if (!test_bit(HCI_UP, &d->flags) ||
1121 hci_dev_test_flag(d, HCI_USER_CHANNEL) ||
1122 d->dev_type != HCI_PRIMARY)
1123 continue;
1124
1125 /* Simple routing:
1126 * No source address - find interface with bdaddr != dst
1127 * Source address - find interface with bdaddr == src
1128 */
1129
1130 if (use_src) {
1131 bdaddr_t id_addr;
1132 u8 id_addr_type;
1133
1134 if (src_type == BDADDR_BREDR) {
1135 if (!lmp_bredr_capable(d))
1136 continue;
1137 bacpy(&id_addr, &d->bdaddr);
1138 id_addr_type = BDADDR_BREDR;
1139 } else {
1140 if (!lmp_le_capable(d))
1141 continue;
1142
1143 hci_copy_identity_address(d, &id_addr,
1144 &id_addr_type);
1145
1146 /* Convert from HCI to three-value type */
1147 if (id_addr_type == ADDR_LE_DEV_PUBLIC)
1148 id_addr_type = BDADDR_LE_PUBLIC;
1149 else
1150 id_addr_type = BDADDR_LE_RANDOM;
1151 }
1152
1153 if (!bacmp(&id_addr, src) && id_addr_type == src_type) {
1154 hdev = d; break;
1155 }
1156 } else {
1157 if (bacmp(&d->bdaddr, dst)) {
1158 hdev = d; break;
1159 }
1160 }
1161 }
1162
1163 if (hdev)
1164 hdev = hci_dev_hold(hdev);
1165
1166 read_unlock(&hci_dev_list_lock);
1167 return hdev;
1168}
1169EXPORT_SYMBOL(hci_get_route);
1170
1171/* This function requires the caller holds hdev->lock */
1172static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
1173{
1174 struct hci_dev *hdev = conn->hdev;
1175 struct hci_conn_params *params;
1176
1177 params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
1178 conn->dst_type);
1179 if (params && params->conn) {
1180 hci_conn_drop(params->conn);
1181 hci_conn_put(params->conn);
1182 params->conn = NULL;
1183 }
1184
1185 /* If the status indicates successful cancellation of
1186 * the attempt (i.e. Unknown Connection Id) there's no point of
1187 * notifying failure since we'll go back to keep trying to
1188 * connect. The only exception is explicit connect requests
1189 * where a timeout + cancel does indicate an actual failure.
1190 */
1191 if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
1192 (params && params->explicit_connect))
1193 mgmt_connect_failed(hdev, &conn->dst, conn->type,
1194 conn->dst_type, status);
1195
1196 /* Since we may have temporarily stopped the background scanning in
1197 * favor of connection establishment, we should restart it.
1198 */
1199 hci_update_passive_scan(hdev);
1200
1201 /* Enable advertising in case this was a failed connection
1202 * attempt as a peripheral.
1203 */
1204 hci_enable_advertising(hdev);
1205}
1206
1207/* This function requires the caller holds hdev->lock */
1208void hci_conn_failed(struct hci_conn *conn, u8 status)
1209{
1210 struct hci_dev *hdev = conn->hdev;
1211
1212 bt_dev_dbg(hdev, "status 0x%2.2x", status);
1213
1214 switch (conn->type) {
1215 case LE_LINK:
1216 hci_le_conn_failed(conn, status);
1217 break;
1218 case ACL_LINK:
1219 mgmt_connect_failed(hdev, &conn->dst, conn->type,
1220 conn->dst_type, status);
1221 break;
1222 }
1223
1224 conn->state = BT_CLOSED;
1225 hci_connect_cfm(conn, status);
1226 hci_conn_del(conn);
1227}
1228
1229static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err)
1230{
1231 struct hci_conn *conn = data;
1232
1233 hci_dev_lock(hdev);
1234
1235 if (!err) {
1236 hci_connect_le_scan_cleanup(conn);
1237 goto done;
1238 }
1239
1240 bt_dev_err(hdev, "request failed to create LE connection: err %d", err);
1241
1242 /* Check if connection is still pending */
1243 if (conn != hci_lookup_le_connect(hdev))
1244 goto done;
1245
1246 hci_conn_failed(conn, bt_status(err));
1247
1248done:
1249 hci_dev_unlock(hdev);
1250}
1251
1252static int hci_connect_le_sync(struct hci_dev *hdev, void *data)
1253{
1254 struct hci_conn *conn = data;
1255
1256 bt_dev_dbg(hdev, "conn %p", conn);
1257
1258 return hci_le_create_conn_sync(hdev, conn);
1259}
1260
1261struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst,
1262 u8 dst_type, bool dst_resolved, u8 sec_level,
1263 u16 conn_timeout, u8 role)
1264{
1265 struct hci_conn *conn;
1266 struct smp_irk *irk;
1267 int err;
1268
1269 /* Let's make sure that le is enabled.*/
1270 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1271 if (lmp_le_capable(hdev))
1272 return ERR_PTR(-ECONNREFUSED);
1273
1274 return ERR_PTR(-EOPNOTSUPP);
1275 }
1276
1277 /* Since the controller supports only one LE connection attempt at a
1278 * time, we return -EBUSY if there is any connection attempt running.
1279 */
1280 if (hci_lookup_le_connect(hdev))
1281 return ERR_PTR(-EBUSY);
1282
1283 /* If there's already a connection object but it's not in
1284 * scanning state it means it must already be established, in
1285 * which case we can't do anything else except report a failure
1286 * to connect.
1287 */
1288 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1289 if (conn && !test_bit(HCI_CONN_SCANNING, &conn->flags)) {
1290 return ERR_PTR(-EBUSY);
1291 }
1292
1293 /* Check if the destination address has been resolved by the controller
1294 * since if it did then the identity address shall be used.
1295 */
1296 if (!dst_resolved) {
1297 /* When given an identity address with existing identity
1298 * resolving key, the connection needs to be established
1299 * to a resolvable random address.
1300 *
1301 * Storing the resolvable random address is required here
1302 * to handle connection failures. The address will later
1303 * be resolved back into the original identity address
1304 * from the connect request.
1305 */
1306 irk = hci_find_irk_by_addr(hdev, dst, dst_type);
1307 if (irk && bacmp(&irk->rpa, BDADDR_ANY)) {
1308 dst = &irk->rpa;
1309 dst_type = ADDR_LE_DEV_RANDOM;
1310 }
1311 }
1312
1313 if (conn) {
1314 bacpy(&conn->dst, dst);
1315 } else {
1316 conn = hci_conn_add(hdev, LE_LINK, dst, role);
1317 if (!conn)
1318 return ERR_PTR(-ENOMEM);
1319 hci_conn_hold(conn);
1320 conn->pending_sec_level = sec_level;
1321 }
1322
1323 conn->dst_type = dst_type;
1324 conn->sec_level = BT_SECURITY_LOW;
1325 conn->conn_timeout = conn_timeout;
1326
1327 conn->state = BT_CONNECT;
1328 clear_bit(HCI_CONN_SCANNING, &conn->flags);
1329
1330 err = hci_cmd_sync_queue(hdev, hci_connect_le_sync, conn,
1331 create_le_conn_complete);
1332 if (err) {
1333 hci_conn_del(conn);
1334 return ERR_PTR(err);
1335 }
1336
1337 return conn;
1338}
1339
1340static bool is_connected(struct hci_dev *hdev, bdaddr_t *addr, u8 type)
1341{
1342 struct hci_conn *conn;
1343
1344 conn = hci_conn_hash_lookup_le(hdev, addr, type);
1345 if (!conn)
1346 return false;
1347
1348 if (conn->state != BT_CONNECTED)
1349 return false;
1350
1351 return true;
1352}
1353
1354/* This function requires the caller holds hdev->lock */
1355static int hci_explicit_conn_params_set(struct hci_dev *hdev,
1356 bdaddr_t *addr, u8 addr_type)
1357{
1358 struct hci_conn_params *params;
1359
1360 if (is_connected(hdev, addr, addr_type))
1361 return -EISCONN;
1362
1363 params = hci_conn_params_lookup(hdev, addr, addr_type);
1364 if (!params) {
1365 params = hci_conn_params_add(hdev, addr, addr_type);
1366 if (!params)
1367 return -ENOMEM;
1368
1369 /* If we created new params, mark them to be deleted in
1370 * hci_connect_le_scan_cleanup. It's different case than
1371 * existing disabled params, those will stay after cleanup.
1372 */
1373 params->auto_connect = HCI_AUTO_CONN_EXPLICIT;
1374 }
1375
1376 /* We're trying to connect, so make sure params are at pend_le_conns */
1377 if (params->auto_connect == HCI_AUTO_CONN_DISABLED ||
1378 params->auto_connect == HCI_AUTO_CONN_REPORT ||
1379 params->auto_connect == HCI_AUTO_CONN_EXPLICIT) {
1380 list_del_init(¶ms->action);
1381 list_add(¶ms->action, &hdev->pend_le_conns);
1382 }
1383
1384 params->explicit_connect = true;
1385
1386 BT_DBG("addr %pMR (type %u) auto_connect %u", addr, addr_type,
1387 params->auto_connect);
1388
1389 return 0;
1390}
1391
1392static int qos_set_big(struct hci_dev *hdev, struct bt_iso_qos *qos)
1393{
1394 struct iso_list_data data;
1395
1396 /* Allocate a BIG if not set */
1397 if (qos->big == BT_ISO_QOS_BIG_UNSET) {
1398 for (data.big = 0x00; data.big < 0xef; data.big++) {
1399 data.count = 0;
1400 data.bis = 0xff;
1401
1402 hci_conn_hash_list_state(hdev, bis_list, ISO_LINK,
1403 BT_BOUND, &data);
1404 if (!data.count)
1405 break;
1406 }
1407
1408 if (data.big == 0xef)
1409 return -EADDRNOTAVAIL;
1410
1411 /* Update BIG */
1412 qos->big = data.big;
1413 }
1414
1415 return 0;
1416}
1417
1418static int qos_set_bis(struct hci_dev *hdev, struct bt_iso_qos *qos)
1419{
1420 struct iso_list_data data;
1421
1422 /* Allocate BIS if not set */
1423 if (qos->bis == BT_ISO_QOS_BIS_UNSET) {
1424 /* Find an unused adv set to advertise BIS, skip instance 0x00
1425 * since it is reserved as general purpose set.
1426 */
1427 for (data.bis = 0x01; data.bis < hdev->le_num_of_adv_sets;
1428 data.bis++) {
1429 data.count = 0;
1430
1431 hci_conn_hash_list_state(hdev, bis_list, ISO_LINK,
1432 BT_BOUND, &data);
1433 if (!data.count)
1434 break;
1435 }
1436
1437 if (data.bis == hdev->le_num_of_adv_sets)
1438 return -EADDRNOTAVAIL;
1439
1440 /* Update BIS */
1441 qos->bis = data.bis;
1442 }
1443
1444 return 0;
1445}
1446
1447/* This function requires the caller holds hdev->lock */
1448static struct hci_conn *hci_add_bis(struct hci_dev *hdev, bdaddr_t *dst,
1449 struct bt_iso_qos *qos)
1450{
1451 struct hci_conn *conn;
1452 struct iso_list_data data;
1453 int err;
1454
1455 /* Let's make sure that le is enabled.*/
1456 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1457 if (lmp_le_capable(hdev))
1458 return ERR_PTR(-ECONNREFUSED);
1459 return ERR_PTR(-EOPNOTSUPP);
1460 }
1461
1462 err = qos_set_big(hdev, qos);
1463 if (err)
1464 return ERR_PTR(err);
1465
1466 err = qos_set_bis(hdev, qos);
1467 if (err)
1468 return ERR_PTR(err);
1469
1470 data.big = qos->big;
1471 data.bis = qos->bis;
1472 data.count = 0;
1473
1474 /* Check if there is already a matching BIG/BIS */
1475 hci_conn_hash_list_state(hdev, bis_list, ISO_LINK, BT_BOUND, &data);
1476 if (data.count)
1477 return ERR_PTR(-EADDRINUSE);
1478
1479 conn = hci_conn_hash_lookup_bis(hdev, dst, qos->big, qos->bis);
1480 if (conn)
1481 return ERR_PTR(-EADDRINUSE);
1482
1483 conn = hci_conn_add(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1484 if (!conn)
1485 return ERR_PTR(-ENOMEM);
1486
1487 set_bit(HCI_CONN_PER_ADV, &conn->flags);
1488 conn->state = BT_CONNECT;
1489
1490 hci_conn_hold(conn);
1491 return conn;
1492}
1493
1494/* This function requires the caller holds hdev->lock */
1495struct hci_conn *hci_connect_le_scan(struct hci_dev *hdev, bdaddr_t *dst,
1496 u8 dst_type, u8 sec_level,
1497 u16 conn_timeout,
1498 enum conn_reasons conn_reason)
1499{
1500 struct hci_conn *conn;
1501
1502 /* Let's make sure that le is enabled.*/
1503 if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
1504 if (lmp_le_capable(hdev))
1505 return ERR_PTR(-ECONNREFUSED);
1506
1507 return ERR_PTR(-EOPNOTSUPP);
1508 }
1509
1510 /* Some devices send ATT messages as soon as the physical link is
1511 * established. To be able to handle these ATT messages, the user-
1512 * space first establishes the connection and then starts the pairing
1513 * process.
1514 *
1515 * So if a hci_conn object already exists for the following connection
1516 * attempt, we simply update pending_sec_level and auth_type fields
1517 * and return the object found.
1518 */
1519 conn = hci_conn_hash_lookup_le(hdev, dst, dst_type);
1520 if (conn) {
1521 if (conn->pending_sec_level < sec_level)
1522 conn->pending_sec_level = sec_level;
1523 goto done;
1524 }
1525
1526 BT_DBG("requesting refresh of dst_addr");
1527
1528 conn = hci_conn_add(hdev, LE_LINK, dst, HCI_ROLE_MASTER);
1529 if (!conn)
1530 return ERR_PTR(-ENOMEM);
1531
1532 if (hci_explicit_conn_params_set(hdev, dst, dst_type) < 0) {
1533 hci_conn_del(conn);
1534 return ERR_PTR(-EBUSY);
1535 }
1536
1537 conn->state = BT_CONNECT;
1538 set_bit(HCI_CONN_SCANNING, &conn->flags);
1539 conn->dst_type = dst_type;
1540 conn->sec_level = BT_SECURITY_LOW;
1541 conn->pending_sec_level = sec_level;
1542 conn->conn_timeout = conn_timeout;
1543 conn->conn_reason = conn_reason;
1544
1545 hci_update_passive_scan(hdev);
1546
1547done:
1548 hci_conn_hold(conn);
1549 return conn;
1550}
1551
1552struct hci_conn *hci_connect_acl(struct hci_dev *hdev, bdaddr_t *dst,
1553 u8 sec_level, u8 auth_type,
1554 enum conn_reasons conn_reason)
1555{
1556 struct hci_conn *acl;
1557
1558 if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
1559 if (lmp_bredr_capable(hdev))
1560 return ERR_PTR(-ECONNREFUSED);
1561
1562 return ERR_PTR(-EOPNOTSUPP);
1563 }
1564
1565 acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
1566 if (!acl) {
1567 acl = hci_conn_add(hdev, ACL_LINK, dst, HCI_ROLE_MASTER);
1568 if (!acl)
1569 return ERR_PTR(-ENOMEM);
1570 }
1571
1572 hci_conn_hold(acl);
1573
1574 acl->conn_reason = conn_reason;
1575 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
1576 acl->sec_level = BT_SECURITY_LOW;
1577 acl->pending_sec_level = sec_level;
1578 acl->auth_type = auth_type;
1579 hci_acl_create_connection(acl);
1580 }
1581
1582 return acl;
1583}
1584
1585struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type, bdaddr_t *dst,
1586 __u16 setting, struct bt_codec *codec)
1587{
1588 struct hci_conn *acl;
1589 struct hci_conn *sco;
1590
1591 acl = hci_connect_acl(hdev, dst, BT_SECURITY_LOW, HCI_AT_NO_BONDING,
1592 CONN_REASON_SCO_CONNECT);
1593 if (IS_ERR(acl))
1594 return acl;
1595
1596 sco = hci_conn_hash_lookup_ba(hdev, type, dst);
1597 if (!sco) {
1598 sco = hci_conn_add(hdev, type, dst, HCI_ROLE_MASTER);
1599 if (!sco) {
1600 hci_conn_drop(acl);
1601 return ERR_PTR(-ENOMEM);
1602 }
1603 }
1604
1605 acl->link = sco;
1606 sco->link = acl;
1607
1608 hci_conn_hold(sco);
1609
1610 sco->setting = setting;
1611 sco->codec = *codec;
1612
1613 if (acl->state == BT_CONNECTED &&
1614 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
1615 set_bit(HCI_CONN_POWER_SAVE, &acl->flags);
1616 hci_conn_enter_active_mode(acl, BT_POWER_FORCE_ACTIVE_ON);
1617
1618 if (test_bit(HCI_CONN_MODE_CHANGE_PEND, &acl->flags)) {
1619 /* defer SCO setup until mode change completed */
1620 set_bit(HCI_CONN_SCO_SETUP_PEND, &acl->flags);
1621 return sco;
1622 }
1623
1624 hci_sco_setup(acl, 0x00);
1625 }
1626
1627 return sco;
1628}
1629
1630static void cis_add(struct iso_list_data *d, struct bt_iso_qos *qos)
1631{
1632 struct hci_cis_params *cis = &d->pdu.cis[d->pdu.cp.num_cis];
1633
1634 cis->cis_id = qos->cis;
1635 cis->c_sdu = cpu_to_le16(qos->out.sdu);
1636 cis->p_sdu = cpu_to_le16(qos->in.sdu);
1637 cis->c_phy = qos->out.phy ? qos->out.phy : qos->in.phy;
1638 cis->p_phy = qos->in.phy ? qos->in.phy : qos->out.phy;
1639 cis->c_rtn = qos->out.rtn;
1640 cis->p_rtn = qos->in.rtn;
1641
1642 d->pdu.cp.num_cis++;
1643}
1644
1645static void cis_list(struct hci_conn *conn, void *data)
1646{
1647 struct iso_list_data *d = data;
1648
1649 /* Skip if broadcast/ANY address */
1650 if (!bacmp(&conn->dst, BDADDR_ANY))
1651 return;
1652
1653 if (d->cig != conn->iso_qos.cig || d->cis == BT_ISO_QOS_CIS_UNSET ||
1654 d->cis != conn->iso_qos.cis)
1655 return;
1656
1657 d->count++;
1658
1659 if (d->pdu.cp.cig_id == BT_ISO_QOS_CIG_UNSET ||
1660 d->count >= ARRAY_SIZE(d->pdu.cis))
1661 return;
1662
1663 cis_add(d, &conn->iso_qos);
1664}
1665
1666static int hci_le_create_big(struct hci_conn *conn, struct bt_iso_qos *qos)
1667{
1668 struct hci_dev *hdev = conn->hdev;
1669 struct hci_cp_le_create_big cp;
1670
1671 memset(&cp, 0, sizeof(cp));
1672
1673 cp.handle = qos->big;
1674 cp.adv_handle = qos->bis;
1675 cp.num_bis = 0x01;
1676 hci_cpu_to_le24(qos->out.interval, cp.bis.sdu_interval);
1677 cp.bis.sdu = cpu_to_le16(qos->out.sdu);
1678 cp.bis.latency = cpu_to_le16(qos->out.latency);
1679 cp.bis.rtn = qos->out.rtn;
1680 cp.bis.phy = qos->out.phy;
1681 cp.bis.packing = qos->packing;
1682 cp.bis.framing = qos->framing;
1683 cp.bis.encryption = 0x00;
1684 memset(&cp.bis.bcode, 0, sizeof(cp.bis.bcode));
1685
1686 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_BIG, sizeof(cp), &cp);
1687}
1688
1689static bool hci_le_set_cig_params(struct hci_conn *conn, struct bt_iso_qos *qos)
1690{
1691 struct hci_dev *hdev = conn->hdev;
1692 struct iso_list_data data;
1693
1694 memset(&data, 0, sizeof(data));
1695
1696 /* Allocate a CIG if not set */
1697 if (qos->cig == BT_ISO_QOS_CIG_UNSET) {
1698 for (data.cig = 0x00; data.cig < 0xff; data.cig++) {
1699 data.count = 0;
1700 data.cis = 0xff;
1701
1702 hci_conn_hash_list_state(hdev, cis_list, ISO_LINK,
1703 BT_BOUND, &data);
1704 if (data.count)
1705 continue;
1706
1707 hci_conn_hash_list_state(hdev, cis_list, ISO_LINK,
1708 BT_CONNECTED, &data);
1709 if (!data.count)
1710 break;
1711 }
1712
1713 if (data.cig == 0xff)
1714 return false;
1715
1716 /* Update CIG */
1717 qos->cig = data.cig;
1718 }
1719
1720 data.pdu.cp.cig_id = qos->cig;
1721 hci_cpu_to_le24(qos->out.interval, data.pdu.cp.c_interval);
1722 hci_cpu_to_le24(qos->in.interval, data.pdu.cp.p_interval);
1723 data.pdu.cp.sca = qos->sca;
1724 data.pdu.cp.packing = qos->packing;
1725 data.pdu.cp.framing = qos->framing;
1726 data.pdu.cp.c_latency = cpu_to_le16(qos->out.latency);
1727 data.pdu.cp.p_latency = cpu_to_le16(qos->in.latency);
1728
1729 if (qos->cis != BT_ISO_QOS_CIS_UNSET) {
1730 data.count = 0;
1731 data.cig = qos->cig;
1732 data.cis = qos->cis;
1733
1734 hci_conn_hash_list_state(hdev, cis_list, ISO_LINK, BT_BOUND,
1735 &data);
1736 if (data.count)
1737 return false;
1738
1739 cis_add(&data, qos);
1740 }
1741
1742 /* Reprogram all CIS(s) with the same CIG */
1743 for (data.cig = qos->cig, data.cis = 0x00; data.cis < 0x11;
1744 data.cis++) {
1745 data.count = 0;
1746
1747 hci_conn_hash_list_state(hdev, cis_list, ISO_LINK, BT_BOUND,
1748 &data);
1749 if (data.count)
1750 continue;
1751
1752 /* Allocate a CIS if not set */
1753 if (qos->cis == BT_ISO_QOS_CIS_UNSET) {
1754 /* Update CIS */
1755 qos->cis = data.cis;
1756 cis_add(&data, qos);
1757 }
1758 }
1759
1760 if (qos->cis == BT_ISO_QOS_CIS_UNSET || !data.pdu.cp.num_cis)
1761 return false;
1762
1763 if (hci_send_cmd(hdev, HCI_OP_LE_SET_CIG_PARAMS,
1764 sizeof(data.pdu.cp) +
1765 (data.pdu.cp.num_cis * sizeof(*data.pdu.cis)),
1766 &data.pdu) < 0)
1767 return false;
1768
1769 return true;
1770}
1771
1772struct hci_conn *hci_bind_cis(struct hci_dev *hdev, bdaddr_t *dst,
1773 __u8 dst_type, struct bt_iso_qos *qos)
1774{
1775 struct hci_conn *cis;
1776
1777 cis = hci_conn_hash_lookup_cis(hdev, dst, dst_type);
1778 if (!cis) {
1779 cis = hci_conn_add(hdev, ISO_LINK, dst, HCI_ROLE_MASTER);
1780 if (!cis)
1781 return ERR_PTR(-ENOMEM);
1782 cis->cleanup = cis_cleanup;
1783 cis->dst_type = dst_type;
1784 }
1785
1786 if (cis->state == BT_CONNECTED)
1787 return cis;
1788
1789 /* Check if CIS has been set and the settings matches */
1790 if (cis->state == BT_BOUND &&
1791 !memcmp(&cis->iso_qos, qos, sizeof(*qos)))
1792 return cis;
1793
1794 /* Update LINK PHYs according to QoS preference */
1795 cis->le_tx_phy = qos->out.phy;
1796 cis->le_rx_phy = qos->in.phy;
1797
1798 /* If output interval is not set use the input interval as it cannot be
1799 * 0x000000.
1800 */
1801 if (!qos->out.interval)
1802 qos->out.interval = qos->in.interval;
1803
1804 /* If input interval is not set use the output interval as it cannot be
1805 * 0x000000.
1806 */
1807 if (!qos->in.interval)
1808 qos->in.interval = qos->out.interval;
1809
1810 /* If output latency is not set use the input latency as it cannot be
1811 * 0x0000.
1812 */
1813 if (!qos->out.latency)
1814 qos->out.latency = qos->in.latency;
1815
1816 /* If input latency is not set use the output latency as it cannot be
1817 * 0x0000.
1818 */
1819 if (!qos->in.latency)
1820 qos->in.latency = qos->out.latency;
1821
1822 if (!hci_le_set_cig_params(cis, qos)) {
1823 hci_conn_drop(cis);
1824 return ERR_PTR(-EINVAL);
1825 }
1826
1827 cis->iso_qos = *qos;
1828 cis->state = BT_BOUND;
1829
1830 return cis;
1831}
1832
1833bool hci_iso_setup_path(struct hci_conn *conn)
1834{
1835 struct hci_dev *hdev = conn->hdev;
1836 struct hci_cp_le_setup_iso_path cmd;
1837
1838 memset(&cmd, 0, sizeof(cmd));
1839
1840 if (conn->iso_qos.out.sdu) {
1841 cmd.handle = cpu_to_le16(conn->handle);
1842 cmd.direction = 0x00; /* Input (Host to Controller) */
1843 cmd.path = 0x00; /* HCI path if enabled */
1844 cmd.codec = 0x03; /* Transparent Data */
1845
1846 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
1847 &cmd) < 0)
1848 return false;
1849 }
1850
1851 if (conn->iso_qos.in.sdu) {
1852 cmd.handle = cpu_to_le16(conn->handle);
1853 cmd.direction = 0x01; /* Output (Controller to Host) */
1854 cmd.path = 0x00; /* HCI path if enabled */
1855 cmd.codec = 0x03; /* Transparent Data */
1856
1857 if (hci_send_cmd(hdev, HCI_OP_LE_SETUP_ISO_PATH, sizeof(cmd),
1858 &cmd) < 0)
1859 return false;
1860 }
1861
1862 return true;
1863}
1864
1865static int hci_create_cis_sync(struct hci_dev *hdev, void *data)
1866{
1867 struct {
1868 struct hci_cp_le_create_cis cp;
1869 struct hci_cis cis[0x1f];
1870 } cmd;
1871 struct hci_conn *conn = data;
1872 u8 cig;
1873
1874 memset(&cmd, 0, sizeof(cmd));
1875 cmd.cis[0].acl_handle = cpu_to_le16(conn->link->handle);
1876 cmd.cis[0].cis_handle = cpu_to_le16(conn->handle);
1877 cmd.cp.num_cis++;
1878 cig = conn->iso_qos.cig;
1879
1880 hci_dev_lock(hdev);
1881
1882 rcu_read_lock();
1883
1884 list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
1885 struct hci_cis *cis = &cmd.cis[cmd.cp.num_cis];
1886
1887 if (conn == data || conn->type != ISO_LINK ||
1888 conn->state == BT_CONNECTED || conn->iso_qos.cig != cig)
1889 continue;
1890
1891 /* Check if all CIS(s) belonging to a CIG are ready */
1892 if (!conn->link || conn->link->state != BT_CONNECTED ||
1893 conn->state != BT_CONNECT) {
1894 cmd.cp.num_cis = 0;
1895 break;
1896 }
1897
1898 /* Group all CIS with state BT_CONNECT since the spec don't
1899 * allow to send them individually:
1900 *
1901 * BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E
1902 * page 2566:
1903 *
1904 * If the Host issues this command before all the
1905 * HCI_LE_CIS_Established events from the previous use of the
1906 * command have been generated, the Controller shall return the
1907 * error code Command Disallowed (0x0C).
1908 */
1909 cis->acl_handle = cpu_to_le16(conn->link->handle);
1910 cis->cis_handle = cpu_to_le16(conn->handle);
1911 cmd.cp.num_cis++;
1912 }
1913
1914 rcu_read_unlock();
1915
1916 hci_dev_unlock(hdev);
1917
1918 if (!cmd.cp.num_cis)
1919 return 0;
1920
1921 return hci_send_cmd(hdev, HCI_OP_LE_CREATE_CIS, sizeof(cmd.cp) +
1922 sizeof(cmd.cis[0]) * cmd.cp.num_cis, &cmd);
1923}
1924
1925int hci_le_create_cis(struct hci_conn *conn)
1926{
1927 struct hci_conn *cis;
1928 struct hci_dev *hdev = conn->hdev;
1929 int err;
1930
1931 switch (conn->type) {
1932 case LE_LINK:
1933 if (!conn->link || conn->state != BT_CONNECTED)
1934 return -EINVAL;
1935 cis = conn->link;
1936 break;
1937 case ISO_LINK:
1938 cis = conn;
1939 break;
1940 default:
1941 return -EINVAL;
1942 }
1943
1944 if (cis->state == BT_CONNECT)
1945 return 0;
1946
1947 /* Queue Create CIS */
1948 err = hci_cmd_sync_queue(hdev, hci_create_cis_sync, cis, NULL);
1949 if (err)
1950 return err;
1951
1952 cis->state = BT_CONNECT;
1953
1954 return 0;
1955}
1956
1957static void hci_iso_qos_setup(struct hci_dev *hdev, struct hci_conn *conn,
1958 struct bt_iso_io_qos *qos, __u8 phy)
1959{
1960 /* Only set MTU if PHY is enabled */
1961 if (!qos->sdu && qos->phy) {
1962 if (hdev->iso_mtu > 0)
1963 qos->sdu = hdev->iso_mtu;
1964 else if (hdev->le_mtu > 0)
1965 qos->sdu = hdev->le_mtu;
1966 else
1967 qos->sdu = hdev->acl_mtu;
1968 }
1969
1970 /* Use the same PHY as ACL if set to any */
1971 if (qos->phy == BT_ISO_PHY_ANY)
1972 qos->phy = phy;
1973
1974 /* Use LE ACL connection interval if not set */
1975 if (!qos->interval)
1976 /* ACL interval unit in 1.25 ms to us */
1977 qos->interval = conn->le_conn_interval * 1250;
1978
1979 /* Use LE ACL connection latency if not set */
1980 if (!qos->latency)
1981 qos->latency = conn->le_conn_latency;
1982}
1983
1984static struct hci_conn *hci_bind_bis(struct hci_conn *conn,
1985 struct bt_iso_qos *qos)
1986{
1987 /* Update LINK PHYs according to QoS preference */
1988 conn->le_tx_phy = qos->out.phy;
1989 conn->le_tx_phy = qos->out.phy;
1990 conn->iso_qos = *qos;
1991 conn->state = BT_BOUND;
1992
1993 return conn;
1994}
1995
1996static int create_big_sync(struct hci_dev *hdev, void *data)
1997{
1998 struct hci_conn *conn = data;
1999 struct bt_iso_qos *qos = &conn->iso_qos;
2000 u16 interval, sync_interval = 0;
2001 u32 flags = 0;
2002 int err;
2003
2004 if (qos->out.phy == 0x02)
2005 flags |= MGMT_ADV_FLAG_SEC_2M;
2006
2007 /* Align intervals */
2008 interval = qos->out.interval / 1250;
2009
2010 if (qos->bis)
2011 sync_interval = qos->sync_interval * 1600;
2012
2013 err = hci_start_per_adv_sync(hdev, qos->bis, conn->le_per_adv_data_len,
2014 conn->le_per_adv_data, flags, interval,
2015 interval, sync_interval);
2016 if (err)
2017 return err;
2018
2019 return hci_le_create_big(conn, &conn->iso_qos);
2020}
2021
2022static void create_pa_complete(struct hci_dev *hdev, void *data, int err)
2023{
2024 struct hci_cp_le_pa_create_sync *cp = data;
2025
2026 bt_dev_dbg(hdev, "");
2027
2028 if (err)
2029 bt_dev_err(hdev, "Unable to create PA: %d", err);
2030
2031 kfree(cp);
2032}
2033
2034static int create_pa_sync(struct hci_dev *hdev, void *data)
2035{
2036 struct hci_cp_le_pa_create_sync *cp = data;
2037 int err;
2038
2039 err = __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_CREATE_SYNC,
2040 sizeof(*cp), cp, HCI_CMD_TIMEOUT);
2041 if (err) {
2042 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2043 return err;
2044 }
2045
2046 return hci_update_passive_scan_sync(hdev);
2047}
2048
2049int hci_pa_create_sync(struct hci_dev *hdev, bdaddr_t *dst, __u8 dst_type,
2050 __u8 sid)
2051{
2052 struct hci_cp_le_pa_create_sync *cp;
2053
2054 if (hci_dev_test_and_set_flag(hdev, HCI_PA_SYNC))
2055 return -EBUSY;
2056
2057 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
2058 if (!cp) {
2059 hci_dev_clear_flag(hdev, HCI_PA_SYNC);
2060 return -ENOMEM;
2061 }
2062
2063 cp->sid = sid;
2064 cp->addr_type = dst_type;
2065 bacpy(&cp->addr, dst);
2066
2067 /* Queue start pa_create_sync and scan */
2068 return hci_cmd_sync_queue(hdev, create_pa_sync, cp, create_pa_complete);
2069}
2070
2071int hci_le_big_create_sync(struct hci_dev *hdev, struct bt_iso_qos *qos,
2072 __u16 sync_handle, __u8 num_bis, __u8 bis[])
2073{
2074 struct _packed {
2075 struct hci_cp_le_big_create_sync cp;
2076 __u8 bis[0x11];
2077 } pdu;
2078 int err;
2079
2080 if (num_bis > sizeof(pdu.bis))
2081 return -EINVAL;
2082
2083 err = qos_set_big(hdev, qos);
2084 if (err)
2085 return err;
2086
2087 memset(&pdu, 0, sizeof(pdu));
2088 pdu.cp.handle = qos->big;
2089 pdu.cp.sync_handle = cpu_to_le16(sync_handle);
2090 pdu.cp.num_bis = num_bis;
2091 memcpy(pdu.bis, bis, num_bis);
2092
2093 return hci_send_cmd(hdev, HCI_OP_LE_BIG_CREATE_SYNC,
2094 sizeof(pdu.cp) + num_bis, &pdu);
2095}
2096
2097static void create_big_complete(struct hci_dev *hdev, void *data, int err)
2098{
2099 struct hci_conn *conn = data;
2100
2101 bt_dev_dbg(hdev, "conn %p", conn);
2102
2103 if (err) {
2104 bt_dev_err(hdev, "Unable to create BIG: %d", err);
2105 hci_connect_cfm(conn, err);
2106 hci_conn_del(conn);
2107 }
2108}
2109
2110struct hci_conn *hci_connect_bis(struct hci_dev *hdev, bdaddr_t *dst,
2111 __u8 dst_type, struct bt_iso_qos *qos,
2112 __u8 base_len, __u8 *base)
2113{
2114 struct hci_conn *conn;
2115 int err;
2116
2117 /* We need hci_conn object using the BDADDR_ANY as dst */
2118 conn = hci_add_bis(hdev, dst, qos);
2119 if (IS_ERR(conn))
2120 return conn;
2121
2122 conn = hci_bind_bis(conn, qos);
2123 if (!conn) {
2124 hci_conn_drop(conn);
2125 return ERR_PTR(-ENOMEM);
2126 }
2127
2128 /* Add Basic Announcement into Peridic Adv Data if BASE is set */
2129 if (base_len && base) {
2130 base_len = eir_append_service_data(conn->le_per_adv_data, 0,
2131 0x1851, base, base_len);
2132 conn->le_per_adv_data_len = base_len;
2133 }
2134
2135 /* Queue start periodic advertising and create BIG */
2136 err = hci_cmd_sync_queue(hdev, create_big_sync, conn,
2137 create_big_complete);
2138 if (err < 0) {
2139 hci_conn_drop(conn);
2140 return ERR_PTR(err);
2141 }
2142
2143 hci_iso_qos_setup(hdev, conn, &qos->out,
2144 conn->le_tx_phy ? conn->le_tx_phy :
2145 hdev->le_tx_def_phys);
2146
2147 return conn;
2148}
2149
2150struct hci_conn *hci_connect_cis(struct hci_dev *hdev, bdaddr_t *dst,
2151 __u8 dst_type, struct bt_iso_qos *qos)
2152{
2153 struct hci_conn *le;
2154 struct hci_conn *cis;
2155
2156 if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
2157 le = hci_connect_le(hdev, dst, dst_type, false,
2158 BT_SECURITY_LOW,
2159 HCI_LE_CONN_TIMEOUT,
2160 HCI_ROLE_SLAVE);
2161 else
2162 le = hci_connect_le_scan(hdev, dst, dst_type,
2163 BT_SECURITY_LOW,
2164 HCI_LE_CONN_TIMEOUT,
2165 CONN_REASON_ISO_CONNECT);
2166 if (IS_ERR(le))
2167 return le;
2168
2169 hci_iso_qos_setup(hdev, le, &qos->out,
2170 le->le_tx_phy ? le->le_tx_phy : hdev->le_tx_def_phys);
2171 hci_iso_qos_setup(hdev, le, &qos->in,
2172 le->le_rx_phy ? le->le_rx_phy : hdev->le_rx_def_phys);
2173
2174 cis = hci_bind_cis(hdev, dst, dst_type, qos);
2175 if (IS_ERR(cis)) {
2176 hci_conn_drop(le);
2177 return cis;
2178 }
2179
2180 le->link = cis;
2181 cis->link = le;
2182
2183 hci_conn_hold(cis);
2184
2185 /* If LE is already connected and CIS handle is already set proceed to
2186 * Create CIS immediately.
2187 */
2188 if (le->state == BT_CONNECTED && cis->handle != HCI_CONN_HANDLE_UNSET)
2189 hci_le_create_cis(le);
2190
2191 return cis;
2192}
2193
2194/* Check link security requirement */
2195int hci_conn_check_link_mode(struct hci_conn *conn)
2196{
2197 BT_DBG("hcon %p", conn);
2198
2199 /* In Secure Connections Only mode, it is required that Secure
2200 * Connections is used and the link is encrypted with AES-CCM
2201 * using a P-256 authenticated combination key.
2202 */
2203 if (hci_dev_test_flag(conn->hdev, HCI_SC_ONLY)) {
2204 if (!hci_conn_sc_enabled(conn) ||
2205 !test_bit(HCI_CONN_AES_CCM, &conn->flags) ||
2206 conn->key_type != HCI_LK_AUTH_COMBINATION_P256)
2207 return 0;
2208 }
2209
2210 /* AES encryption is required for Level 4:
2211 *
2212 * BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C
2213 * page 1319:
2214 *
2215 * 128-bit equivalent strength for link and encryption keys
2216 * required using FIPS approved algorithms (E0 not allowed,
2217 * SAFER+ not allowed, and P-192 not allowed; encryption key
2218 * not shortened)
2219 */
2220 if (conn->sec_level == BT_SECURITY_FIPS &&
2221 !test_bit(HCI_CONN_AES_CCM, &conn->flags)) {
2222 bt_dev_err(conn->hdev,
2223 "Invalid security: Missing AES-CCM usage");
2224 return 0;
2225 }
2226
2227 if (hci_conn_ssp_enabled(conn) &&
2228 !test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2229 return 0;
2230
2231 return 1;
2232}
2233
2234/* Authenticate remote device */
2235static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
2236{
2237 BT_DBG("hcon %p", conn);
2238
2239 if (conn->pending_sec_level > sec_level)
2240 sec_level = conn->pending_sec_level;
2241
2242 if (sec_level > conn->sec_level)
2243 conn->pending_sec_level = sec_level;
2244 else if (test_bit(HCI_CONN_AUTH, &conn->flags))
2245 return 1;
2246
2247 /* Make sure we preserve an existing MITM requirement*/
2248 auth_type |= (conn->auth_type & 0x01);
2249
2250 conn->auth_type = auth_type;
2251
2252 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->flags)) {
2253 struct hci_cp_auth_requested cp;
2254
2255 cp.handle = cpu_to_le16(conn->handle);
2256 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
2257 sizeof(cp), &cp);
2258
2259 /* If we're already encrypted set the REAUTH_PEND flag,
2260 * otherwise set the ENCRYPT_PEND.
2261 */
2262 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2263 set_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
2264 else
2265 set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags);
2266 }
2267
2268 return 0;
2269}
2270
2271/* Encrypt the link */
2272static void hci_conn_encrypt(struct hci_conn *conn)
2273{
2274 BT_DBG("hcon %p", conn);
2275
2276 if (!test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
2277 struct hci_cp_set_conn_encrypt cp;
2278 cp.handle = cpu_to_le16(conn->handle);
2279 cp.encrypt = 0x01;
2280 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT, sizeof(cp),
2281 &cp);
2282 }
2283}
2284
2285/* Enable security */
2286int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type,
2287 bool initiator)
2288{
2289 BT_DBG("hcon %p", conn);
2290
2291 if (conn->type == LE_LINK)
2292 return smp_conn_security(conn, sec_level);
2293
2294 /* For sdp we don't need the link key. */
2295 if (sec_level == BT_SECURITY_SDP)
2296 return 1;
2297
2298 /* For non 2.1 devices and low security level we don't need the link
2299 key. */
2300 if (sec_level == BT_SECURITY_LOW && !hci_conn_ssp_enabled(conn))
2301 return 1;
2302
2303 /* For other security levels we need the link key. */
2304 if (!test_bit(HCI_CONN_AUTH, &conn->flags))
2305 goto auth;
2306
2307 /* An authenticated FIPS approved combination key has sufficient
2308 * security for security level 4. */
2309 if (conn->key_type == HCI_LK_AUTH_COMBINATION_P256 &&
2310 sec_level == BT_SECURITY_FIPS)
2311 goto encrypt;
2312
2313 /* An authenticated combination key has sufficient security for
2314 security level 3. */
2315 if ((conn->key_type == HCI_LK_AUTH_COMBINATION_P192 ||
2316 conn->key_type == HCI_LK_AUTH_COMBINATION_P256) &&
2317 sec_level == BT_SECURITY_HIGH)
2318 goto encrypt;
2319
2320 /* An unauthenticated combination key has sufficient security for
2321 security level 1 and 2. */
2322 if ((conn->key_type == HCI_LK_UNAUTH_COMBINATION_P192 ||
2323 conn->key_type == HCI_LK_UNAUTH_COMBINATION_P256) &&
2324 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW))
2325 goto encrypt;
2326
2327 /* A combination key has always sufficient security for the security
2328 levels 1 or 2. High security level requires the combination key
2329 is generated using maximum PIN code length (16).
2330 For pre 2.1 units. */
2331 if (conn->key_type == HCI_LK_COMBINATION &&
2332 (sec_level == BT_SECURITY_MEDIUM || sec_level == BT_SECURITY_LOW ||
2333 conn->pin_length == 16))
2334 goto encrypt;
2335
2336auth:
2337 if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags))
2338 return 0;
2339
2340 if (initiator)
2341 set_bit(HCI_CONN_AUTH_INITIATOR, &conn->flags);
2342
2343 if (!hci_conn_auth(conn, sec_level, auth_type))
2344 return 0;
2345
2346encrypt:
2347 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags)) {
2348 /* Ensure that the encryption key size has been read,
2349 * otherwise stall the upper layer responses.
2350 */
2351 if (!conn->enc_key_size)
2352 return 0;
2353
2354 /* Nothing else needed, all requirements are met */
2355 return 1;
2356 }
2357
2358 hci_conn_encrypt(conn);
2359 return 0;
2360}
2361EXPORT_SYMBOL(hci_conn_security);
2362
2363/* Check secure link requirement */
2364int hci_conn_check_secure(struct hci_conn *conn, __u8 sec_level)
2365{
2366 BT_DBG("hcon %p", conn);
2367
2368 /* Accept if non-secure or higher security level is required */
2369 if (sec_level != BT_SECURITY_HIGH && sec_level != BT_SECURITY_FIPS)
2370 return 1;
2371
2372 /* Accept if secure or higher security level is already present */
2373 if (conn->sec_level == BT_SECURITY_HIGH ||
2374 conn->sec_level == BT_SECURITY_FIPS)
2375 return 1;
2376
2377 /* Reject not secure link */
2378 return 0;
2379}
2380EXPORT_SYMBOL(hci_conn_check_secure);
2381
2382/* Switch role */
2383int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
2384{
2385 BT_DBG("hcon %p", conn);
2386
2387 if (role == conn->role)
2388 return 1;
2389
2390 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->flags)) {
2391 struct hci_cp_switch_role cp;
2392 bacpy(&cp.bdaddr, &conn->dst);
2393 cp.role = role;
2394 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
2395 }
2396
2397 return 0;
2398}
2399EXPORT_SYMBOL(hci_conn_switch_role);
2400
2401/* Enter active mode */
2402void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active)
2403{
2404 struct hci_dev *hdev = conn->hdev;
2405
2406 BT_DBG("hcon %p mode %d", conn, conn->mode);
2407
2408 if (conn->mode != HCI_CM_SNIFF)
2409 goto timer;
2410
2411 if (!test_bit(HCI_CONN_POWER_SAVE, &conn->flags) && !force_active)
2412 goto timer;
2413
2414 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->flags)) {
2415 struct hci_cp_exit_sniff_mode cp;
2416 cp.handle = cpu_to_le16(conn->handle);
2417 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
2418 }
2419
2420timer:
2421 if (hdev->idle_timeout > 0)
2422 queue_delayed_work(hdev->workqueue, &conn->idle_work,
2423 msecs_to_jiffies(hdev->idle_timeout));
2424}
2425
2426/* Drop all connection on the device */
2427void hci_conn_hash_flush(struct hci_dev *hdev)
2428{
2429 struct hci_conn_hash *h = &hdev->conn_hash;
2430 struct hci_conn *c, *n;
2431
2432 BT_DBG("hdev %s", hdev->name);
2433
2434 list_for_each_entry_safe(c, n, &h->list, list) {
2435 c->state = BT_CLOSED;
2436
2437 hci_disconn_cfm(c, HCI_ERROR_LOCAL_HOST_TERM);
2438 hci_conn_del(c);
2439 }
2440}
2441
2442/* Check pending connect attempts */
2443void hci_conn_check_pending(struct hci_dev *hdev)
2444{
2445 struct hci_conn *conn;
2446
2447 BT_DBG("hdev %s", hdev->name);
2448
2449 hci_dev_lock(hdev);
2450
2451 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
2452 if (conn)
2453 hci_acl_create_connection(conn);
2454
2455 hci_dev_unlock(hdev);
2456}
2457
2458static u32 get_link_mode(struct hci_conn *conn)
2459{
2460 u32 link_mode = 0;
2461
2462 if (conn->role == HCI_ROLE_MASTER)
2463 link_mode |= HCI_LM_MASTER;
2464
2465 if (test_bit(HCI_CONN_ENCRYPT, &conn->flags))
2466 link_mode |= HCI_LM_ENCRYPT;
2467
2468 if (test_bit(HCI_CONN_AUTH, &conn->flags))
2469 link_mode |= HCI_LM_AUTH;
2470
2471 if (test_bit(HCI_CONN_SECURE, &conn->flags))
2472 link_mode |= HCI_LM_SECURE;
2473
2474 if (test_bit(HCI_CONN_FIPS, &conn->flags))
2475 link_mode |= HCI_LM_FIPS;
2476
2477 return link_mode;
2478}
2479
2480int hci_get_conn_list(void __user *arg)
2481{
2482 struct hci_conn *c;
2483 struct hci_conn_list_req req, *cl;
2484 struct hci_conn_info *ci;
2485 struct hci_dev *hdev;
2486 int n = 0, size, err;
2487
2488 if (copy_from_user(&req, arg, sizeof(req)))
2489 return -EFAULT;
2490
2491 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
2492 return -EINVAL;
2493
2494 size = sizeof(req) + req.conn_num * sizeof(*ci);
2495
2496 cl = kmalloc(size, GFP_KERNEL);
2497 if (!cl)
2498 return -ENOMEM;
2499
2500 hdev = hci_dev_get(req.dev_id);
2501 if (!hdev) {
2502 kfree(cl);
2503 return -ENODEV;
2504 }
2505
2506 ci = cl->conn_info;
2507
2508 hci_dev_lock(hdev);
2509 list_for_each_entry(c, &hdev->conn_hash.list, list) {
2510 bacpy(&(ci + n)->bdaddr, &c->dst);
2511 (ci + n)->handle = c->handle;
2512 (ci + n)->type = c->type;
2513 (ci + n)->out = c->out;
2514 (ci + n)->state = c->state;
2515 (ci + n)->link_mode = get_link_mode(c);
2516 if (++n >= req.conn_num)
2517 break;
2518 }
2519 hci_dev_unlock(hdev);
2520
2521 cl->dev_id = hdev->id;
2522 cl->conn_num = n;
2523 size = sizeof(req) + n * sizeof(*ci);
2524
2525 hci_dev_put(hdev);
2526
2527 err = copy_to_user(arg, cl, size);
2528 kfree(cl);
2529
2530 return err ? -EFAULT : 0;
2531}
2532
2533int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
2534{
2535 struct hci_conn_info_req req;
2536 struct hci_conn_info ci;
2537 struct hci_conn *conn;
2538 char __user *ptr = arg + sizeof(req);
2539
2540 if (copy_from_user(&req, arg, sizeof(req)))
2541 return -EFAULT;
2542
2543 hci_dev_lock(hdev);
2544 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
2545 if (conn) {
2546 bacpy(&ci.bdaddr, &conn->dst);
2547 ci.handle = conn->handle;
2548 ci.type = conn->type;
2549 ci.out = conn->out;
2550 ci.state = conn->state;
2551 ci.link_mode = get_link_mode(conn);
2552 }
2553 hci_dev_unlock(hdev);
2554
2555 if (!conn)
2556 return -ENOENT;
2557
2558 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
2559}
2560
2561int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
2562{
2563 struct hci_auth_info_req req;
2564 struct hci_conn *conn;
2565
2566 if (copy_from_user(&req, arg, sizeof(req)))
2567 return -EFAULT;
2568
2569 hci_dev_lock(hdev);
2570 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
2571 if (conn)
2572 req.type = conn->auth_type;
2573 hci_dev_unlock(hdev);
2574
2575 if (!conn)
2576 return -ENOENT;
2577
2578 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
2579}
2580
2581struct hci_chan *hci_chan_create(struct hci_conn *conn)
2582{
2583 struct hci_dev *hdev = conn->hdev;
2584 struct hci_chan *chan;
2585
2586 BT_DBG("%s hcon %p", hdev->name, conn);
2587
2588 if (test_bit(HCI_CONN_DROP, &conn->flags)) {
2589 BT_DBG("Refusing to create new hci_chan");
2590 return NULL;
2591 }
2592
2593 chan = kzalloc(sizeof(*chan), GFP_KERNEL);
2594 if (!chan)
2595 return NULL;
2596
2597 chan->conn = hci_conn_get(conn);
2598 skb_queue_head_init(&chan->data_q);
2599 chan->state = BT_CONNECTED;
2600
2601 list_add_rcu(&chan->list, &conn->chan_list);
2602
2603 return chan;
2604}
2605
2606void hci_chan_del(struct hci_chan *chan)
2607{
2608 struct hci_conn *conn = chan->conn;
2609 struct hci_dev *hdev = conn->hdev;
2610
2611 BT_DBG("%s hcon %p chan %p", hdev->name, conn, chan);
2612
2613 list_del_rcu(&chan->list);
2614
2615 synchronize_rcu();
2616
2617 /* Prevent new hci_chan's to be created for this hci_conn */
2618 set_bit(HCI_CONN_DROP, &conn->flags);
2619
2620 hci_conn_put(conn);
2621
2622 skb_queue_purge(&chan->data_q);
2623 kfree(chan);
2624}
2625
2626void hci_chan_list_flush(struct hci_conn *conn)
2627{
2628 struct hci_chan *chan, *n;
2629
2630 BT_DBG("hcon %p", conn);
2631
2632 list_for_each_entry_safe(chan, n, &conn->chan_list, list)
2633 hci_chan_del(chan);
2634}
2635
2636static struct hci_chan *__hci_chan_lookup_handle(struct hci_conn *hcon,
2637 __u16 handle)
2638{
2639 struct hci_chan *hchan;
2640
2641 list_for_each_entry(hchan, &hcon->chan_list, list) {
2642 if (hchan->handle == handle)
2643 return hchan;
2644 }
2645
2646 return NULL;
2647}
2648
2649struct hci_chan *hci_chan_lookup_handle(struct hci_dev *hdev, __u16 handle)
2650{
2651 struct hci_conn_hash *h = &hdev->conn_hash;
2652 struct hci_conn *hcon;
2653 struct hci_chan *hchan = NULL;
2654
2655 rcu_read_lock();
2656
2657 list_for_each_entry_rcu(hcon, &h->list, list) {
2658 hchan = __hci_chan_lookup_handle(hcon, handle);
2659 if (hchan)
2660 break;
2661 }
2662
2663 rcu_read_unlock();
2664
2665 return hchan;
2666}
2667
2668u32 hci_conn_get_phy(struct hci_conn *conn)
2669{
2670 u32 phys = 0;
2671
2672 /* BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 2, Part B page 471:
2673 * Table 6.2: Packets defined for synchronous, asynchronous, and
2674 * CPB logical transport types.
2675 */
2676 switch (conn->type) {
2677 case SCO_LINK:
2678 /* SCO logical transport (1 Mb/s):
2679 * HV1, HV2, HV3 and DV.
2680 */
2681 phys |= BT_PHY_BR_1M_1SLOT;
2682
2683 break;
2684
2685 case ACL_LINK:
2686 /* ACL logical transport (1 Mb/s) ptt=0:
2687 * DH1, DM3, DH3, DM5 and DH5.
2688 */
2689 phys |= BT_PHY_BR_1M_1SLOT;
2690
2691 if (conn->pkt_type & (HCI_DM3 | HCI_DH3))
2692 phys |= BT_PHY_BR_1M_3SLOT;
2693
2694 if (conn->pkt_type & (HCI_DM5 | HCI_DH5))
2695 phys |= BT_PHY_BR_1M_5SLOT;
2696
2697 /* ACL logical transport (2 Mb/s) ptt=1:
2698 * 2-DH1, 2-DH3 and 2-DH5.
2699 */
2700 if (!(conn->pkt_type & HCI_2DH1))
2701 phys |= BT_PHY_EDR_2M_1SLOT;
2702
2703 if (!(conn->pkt_type & HCI_2DH3))
2704 phys |= BT_PHY_EDR_2M_3SLOT;
2705
2706 if (!(conn->pkt_type & HCI_2DH5))
2707 phys |= BT_PHY_EDR_2M_5SLOT;
2708
2709 /* ACL logical transport (3 Mb/s) ptt=1:
2710 * 3-DH1, 3-DH3 and 3-DH5.
2711 */
2712 if (!(conn->pkt_type & HCI_3DH1))
2713 phys |= BT_PHY_EDR_3M_1SLOT;
2714
2715 if (!(conn->pkt_type & HCI_3DH3))
2716 phys |= BT_PHY_EDR_3M_3SLOT;
2717
2718 if (!(conn->pkt_type & HCI_3DH5))
2719 phys |= BT_PHY_EDR_3M_5SLOT;
2720
2721 break;
2722
2723 case ESCO_LINK:
2724 /* eSCO logical transport (1 Mb/s): EV3, EV4 and EV5 */
2725 phys |= BT_PHY_BR_1M_1SLOT;
2726
2727 if (!(conn->pkt_type & (ESCO_EV4 | ESCO_EV5)))
2728 phys |= BT_PHY_BR_1M_3SLOT;
2729
2730 /* eSCO logical transport (2 Mb/s): 2-EV3, 2-EV5 */
2731 if (!(conn->pkt_type & ESCO_2EV3))
2732 phys |= BT_PHY_EDR_2M_1SLOT;
2733
2734 if (!(conn->pkt_type & ESCO_2EV5))
2735 phys |= BT_PHY_EDR_2M_3SLOT;
2736
2737 /* eSCO logical transport (3 Mb/s): 3-EV3, 3-EV5 */
2738 if (!(conn->pkt_type & ESCO_3EV3))
2739 phys |= BT_PHY_EDR_3M_1SLOT;
2740
2741 if (!(conn->pkt_type & ESCO_3EV5))
2742 phys |= BT_PHY_EDR_3M_3SLOT;
2743
2744 break;
2745
2746 case LE_LINK:
2747 if (conn->le_tx_phy & HCI_LE_SET_PHY_1M)
2748 phys |= BT_PHY_LE_1M_TX;
2749
2750 if (conn->le_rx_phy & HCI_LE_SET_PHY_1M)
2751 phys |= BT_PHY_LE_1M_RX;
2752
2753 if (conn->le_tx_phy & HCI_LE_SET_PHY_2M)
2754 phys |= BT_PHY_LE_2M_TX;
2755
2756 if (conn->le_rx_phy & HCI_LE_SET_PHY_2M)
2757 phys |= BT_PHY_LE_2M_RX;
2758
2759 if (conn->le_tx_phy & HCI_LE_SET_PHY_CODED)
2760 phys |= BT_PHY_LE_CODED_TX;
2761
2762 if (conn->le_rx_phy & HCI_LE_SET_PHY_CODED)
2763 phys |= BT_PHY_LE_CODED_RX;
2764
2765 break;
2766 }
2767
2768 return phys;
2769}
2770
2771int hci_abort_conn(struct hci_conn *conn, u8 reason)
2772{
2773 int r = 0;
2774
2775 switch (conn->state) {
2776 case BT_CONNECTED:
2777 case BT_CONFIG:
2778 if (conn->type == AMP_LINK) {
2779 struct hci_cp_disconn_phy_link cp;
2780
2781 cp.phy_handle = HCI_PHY_HANDLE(conn->handle);
2782 cp.reason = reason;
2783 r = hci_send_cmd(conn->hdev, HCI_OP_DISCONN_PHY_LINK,
2784 sizeof(cp), &cp);
2785 } else {
2786 struct hci_cp_disconnect dc;
2787
2788 dc.handle = cpu_to_le16(conn->handle);
2789 dc.reason = reason;
2790 r = hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT,
2791 sizeof(dc), &dc);
2792 }
2793
2794 conn->state = BT_DISCONN;
2795
2796 break;
2797 case BT_CONNECT:
2798 if (conn->type == LE_LINK) {
2799 if (test_bit(HCI_CONN_SCANNING, &conn->flags))
2800 break;
2801 r = hci_send_cmd(conn->hdev,
2802 HCI_OP_LE_CREATE_CONN_CANCEL, 0, NULL);
2803 } else if (conn->type == ACL_LINK) {
2804 if (conn->hdev->hci_ver < BLUETOOTH_VER_1_2)
2805 break;
2806 r = hci_send_cmd(conn->hdev,
2807 HCI_OP_CREATE_CONN_CANCEL,
2808 6, &conn->dst);
2809 }
2810 break;
2811 case BT_CONNECT2:
2812 if (conn->type == ACL_LINK) {
2813 struct hci_cp_reject_conn_req rej;
2814
2815 bacpy(&rej.bdaddr, &conn->dst);
2816 rej.reason = reason;
2817
2818 r = hci_send_cmd(conn->hdev,
2819 HCI_OP_REJECT_CONN_REQ,
2820 sizeof(rej), &rej);
2821 } else if (conn->type == SCO_LINK || conn->type == ESCO_LINK) {
2822 struct hci_cp_reject_sync_conn_req rej;
2823
2824 bacpy(&rej.bdaddr, &conn->dst);
2825
2826 /* SCO rejection has its own limited set of
2827 * allowed error values (0x0D-0x0F) which isn't
2828 * compatible with most values passed to this
2829 * function. To be safe hard-code one of the
2830 * values that's suitable for SCO.
2831 */
2832 rej.reason = HCI_ERROR_REJ_LIMITED_RESOURCES;
2833
2834 r = hci_send_cmd(conn->hdev,
2835 HCI_OP_REJECT_SYNC_CONN_REQ,
2836 sizeof(rej), &rej);
2837 }
2838 break;
2839 default:
2840 conn->state = BT_CLOSED;
2841 break;
2842 }
2843
2844 return r;
2845}